if_em.c (revision 037d45a0526f452d96f44059e88f735298a9063d) - OpenGrok cross reference for /freebsd/sys/dev/e1000/if_em.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2001-2024, Intel Corporation
 * Copyright (c) 2016 Nicole Graziano <nicole@nextbsd.org>
 * Copyright (c) 2024 Kevin Bowling <kbowling@FreeBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "if_em.h"
#include "if_igb_iov.h"
#include <sys/sbuf.h>
#include <machine/_inttypes.h>

#define em_mac_min e1000_82571
#define igb_mac_min e1000_82575

/*********************************************************************
 *  Driver version:
 *********************************************************************/
static const char em_driver_version[] = "7.7.8-fbsd";
static const char igb_driver_version[] = "2.5.28-fbsd";

/*********************************************************************
 *  PCI Device ID Table
 *
 *  Used by probe to select devices to load on
 *  Last field stores an index into e1000_strings
 *  Last entry must be all 0s
 *
 *  { Vendor ID, Device ID, SubVendor ID, SubDevice ID, String Index }
 *********************************************************************/

static const pci_vendor_info_t em_vendor_info_array[] =
{
	/* Intel(R) - lem-class legacy devices */
	PVID(0x8086, E1000_DEV_ID_82540EM,
	    "Intel(R) Legacy PRO/1000 MT 82540EM"),
	PVID(0x8086, E1000_DEV_ID_82540EM_LOM,
	    "Intel(R) Legacy PRO/1000 MT 82540EM (LOM)"),
	PVID(0x8086, E1000_DEV_ID_82540EP,
	    "Intel(R) Legacy PRO/1000 MT 82540EP"),
	PVID(0x8086, E1000_DEV_ID_82540EP_LOM,
	    "Intel(R) Legacy PRO/1000 MT 82540EP (LOM)"),
	PVID(0x8086, E1000_DEV_ID_82540EP_LP,
	    "Intel(R) Legacy PRO/1000 MT 82540EP (Mobile)"),

	PVID(0x8086, E1000_DEV_ID_82541EI,
	    "Intel(R) Legacy PRO/1000 MT 82541EI (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82541ER,
	    "Intel(R) Legacy PRO/1000 82541ER"),
	PVID(0x8086, E1000_DEV_ID_82541ER_LOM,
	    "Intel(R) Legacy PRO/1000 MT 82541ER"),
	PVID(0x8086, E1000_DEV_ID_82541EI_MOBILE,
	    "Intel(R) Legacy PRO/1000 MT 82541EI (Mobile)"),
	PVID(0x8086, E1000_DEV_ID_82541GI,
	    "Intel(R) Legacy PRO/1000 MT 82541GI"),
	PVID(0x8086, E1000_DEV_ID_82541GI_LF,
	    "Intel(R) Legacy PRO/1000 GT 82541PI"),
	PVID(0x8086, E1000_DEV_ID_82541GI_MOBILE,
	    "Intel(R) Legacy PRO/1000 MT 82541GI (Mobile)"),

	PVID(0x8086, E1000_DEV_ID_82542,
	    "Intel(R) Legacy PRO/1000 82542 (Fiber)"),

	PVID(0x8086, E1000_DEV_ID_82543GC_FIBER,
	    "Intel(R) Legacy PRO/1000 F 82543GC (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82543GC_COPPER,
	    "Intel(R) Legacy PRO/1000 T 82543GC (Copper)"),

	PVID(0x8086, E1000_DEV_ID_82544EI_COPPER,
	    "Intel(R) Legacy PRO/1000 XT 82544EI (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82544EI_FIBER,
	    "Intel(R) Legacy PRO/1000 XF 82544EI (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82544GC_COPPER,
	    "Intel(R) Legacy PRO/1000 T 82544GC (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82544GC_LOM,
	    "Intel(R) Legacy PRO/1000 XT 82544GC (LOM)"),

	PVID(0x8086, E1000_DEV_ID_82545EM_COPPER,
	    "Intel(R) Legacy PRO/1000 MT 82545EM (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82545EM_FIBER,
	    "Intel(R) Legacy PRO/1000 MF 82545EM (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82545GM_COPPER,
	    "Intel(R) Legacy PRO/1000 MT 82545GM (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82545GM_FIBER,
	    "Intel(R) Legacy PRO/1000 MF 82545GM (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82545GM_SERDES,
	    "Intel(R) Legacy PRO/1000 MB 82545GM (SERDES)"),

	PVID(0x8086, E1000_DEV_ID_82546EB_COPPER,
	    "Intel(R) Legacy PRO/1000 MT 82546EB (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82546EB_FIBER,
	    "Intel(R) Legacy PRO/1000 MF 82546EB (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82546EB_QUAD_COPPER,
	    "Intel(R) Legacy PRO/1000 MT 82546EB (Quad Copper"),
	PVID(0x8086, E1000_DEV_ID_82546GB_COPPER,
	    "Intel(R) Legacy PRO/1000 MT 82546GB (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82546GB_FIBER,
	    "Intel(R) Legacy PRO/1000 MF 82546GB (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82546GB_SERDES,
	    "Intel(R) Legacy PRO/1000 MB 82546GB (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82546GB_PCIE,
	    "Intel(R) Legacy PRO/1000 P 82546GB (PCIe)"),
	PVID(0x8086, E1000_DEV_ID_82546GB_QUAD_COPPER,
	    "Intel(R) Legacy PRO/1000 GT 82546GB (Quad Copper)"),
	PVID(0x8086, E1000_DEV_ID_82546GB_QUAD_COPPER_KSP3,
	    "Intel(R) Legacy PRO/1000 GT 82546GB (Quad Copper)"),

	PVID(0x8086, E1000_DEV_ID_82547EI,
	    "Intel(R) Legacy PRO/1000 CT 82547EI"),
	PVID(0x8086, E1000_DEV_ID_82547EI_MOBILE,
	    "Intel(R) Legacy PRO/1000 CT 82547EI (Mobile)"),
	PVID(0x8086, E1000_DEV_ID_82547GI,
	    "Intel(R) Legacy PRO/1000 CT 82547GI"),

	/* Intel(R) - em-class devices */
	PVID(0x8086, E1000_DEV_ID_82571EB_COPPER,
	    "Intel(R) PRO/1000 PT 82571EB/82571GB (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82571EB_FIBER,
	    "Intel(R) PRO/1000 PF 82571EB/82571GB (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82571EB_SERDES,
	    "Intel(R) PRO/1000 PB 82571EB (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82571EB_SERDES_DUAL,
	    "Intel(R) PRO/1000 82571EB (Dual Mezzanine)"),
	PVID(0x8086, E1000_DEV_ID_82571EB_SERDES_QUAD,
	    "Intel(R) PRO/1000 82571EB (Quad Mezzanine)"),
	PVID(0x8086, E1000_DEV_ID_82571EB_QUAD_COPPER,
	    "Intel(R) PRO/1000 PT 82571EB/82571GB (Quad Copper)"),
	PVID(0x8086, E1000_DEV_ID_82571EB_QUAD_COPPER_LP,
	    "Intel(R) PRO/1000 PT 82571EB/82571GB (Quad Copper)"),
	PVID(0x8086, E1000_DEV_ID_82571EB_QUAD_FIBER,
	    "Intel(R) PRO/1000 PF 82571EB (Quad Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82571PT_QUAD_COPPER,
	    "Intel(R) PRO/1000 PT 82571PT (Quad Copper)"),
	PVID(0x8086, E1000_DEV_ID_82572EI,
	    "Intel(R) PRO/1000 PT 82572EI (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82572EI_COPPER,
	    "Intel(R) PRO/1000 PT 82572EI (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82572EI_FIBER,
	    "Intel(R) PRO/1000 PF 82572EI (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82572EI_SERDES,
	    "Intel(R) PRO/1000 82572EI (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82573E,
	    "Intel(R) PRO/1000 82573E (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82573E_IAMT,
	    "Intel(R) PRO/1000 82573E AMT (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82573L, "Intel(R) PRO/1000 82573L"),
	PVID(0x8086, E1000_DEV_ID_82583V, "Intel(R) 82583V"),
	PVID(0x8086, E1000_DEV_ID_80003ES2LAN_COPPER_SPT,
	    "Intel(R) 80003ES2LAN (Copper)"),
	PVID(0x8086, E1000_DEV_ID_80003ES2LAN_SERDES_SPT,
	    "Intel(R) 80003ES2LAN (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_80003ES2LAN_COPPER_DPT,
	    "Intel(R) 80003ES2LAN (Dual Copper)"),
	PVID(0x8086, E1000_DEV_ID_80003ES2LAN_SERDES_DPT,
	    "Intel(R) 80003ES2LAN (Dual SERDES)"),
	PVID(0x8086, E1000_DEV_ID_ICH8_IGP_M_AMT,
	    "Intel(R) 82566MM ICH8 AMT (Mobile)"),
	PVID(0x8086, E1000_DEV_ID_ICH8_IGP_AMT, "Intel(R) 82566DM ICH8 AMT"),
	PVID(0x8086, E1000_DEV_ID_ICH8_IGP_C, "Intel(R) 82566DC ICH8"),
	PVID(0x8086, E1000_DEV_ID_ICH8_IFE, "Intel(R) 82562V ICH8"),
	PVID(0x8086, E1000_DEV_ID_ICH8_IFE_GT, "Intel(R) 82562GT ICH8"),
	PVID(0x8086, E1000_DEV_ID_ICH8_IFE_G, "Intel(R) 82562G ICH8"),
	PVID(0x8086, E1000_DEV_ID_ICH8_IGP_M, "Intel(R) 82566MC ICH8"),
	PVID(0x8086, E1000_DEV_ID_ICH8_82567V_3, "Intel(R) 82567V-3 ICH8"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IGP_M_AMT,
	    "Intel(R) 82567LM ICH9 AMT"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IGP_AMT,
	    "Intel(R) 82566DM-2 ICH9 AMT"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IGP_C, "Intel(R) 82566DC-2 ICH9"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IGP_M, "Intel(R) 82567LF ICH9"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IGP_M_V, "Intel(R) 82567V ICH9"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IFE, "Intel(R) 82562V-2 ICH9"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IFE_GT, "Intel(R) 82562GT-2 ICH9"),
	PVID(0x8086, E1000_DEV_ID_ICH9_IFE_G, "Intel(R) 82562G-2 ICH9"),
	PVID(0x8086, E1000_DEV_ID_ICH9_BM, "Intel(R) 82567LM-4 ICH9"),
	PVID(0x8086, E1000_DEV_ID_82574L, "Intel(R) Gigabit CT 82574L"),
	PVID(0x8086, E1000_DEV_ID_82574LA, "Intel(R) 82574L-Apple"),
	PVID(0x8086, E1000_DEV_ID_ICH10_R_BM_LM, "Intel(R) 82567LM-2 ICH10"),
	PVID(0x8086, E1000_DEV_ID_ICH10_R_BM_LF, "Intel(R) 82567LF-2 ICH10"),
	PVID(0x8086, E1000_DEV_ID_ICH10_R_BM_V, "Intel(R) 82567V-2 ICH10"),
	PVID(0x8086, E1000_DEV_ID_ICH10_D_BM_LM, "Intel(R) 82567LM-3 ICH10"),
	PVID(0x8086, E1000_DEV_ID_ICH10_D_BM_LF, "Intel(R) 82567LF-3 ICH10"),
	PVID(0x8086, E1000_DEV_ID_ICH10_D_BM_V, "Intel(R) 82567V-4 ICH10"),
	PVID(0x8086, E1000_DEV_ID_PCH_M_HV_LM, "Intel(R) 82577LM"),
	PVID(0x8086, E1000_DEV_ID_PCH_M_HV_LC, "Intel(R) 82577LC"),
	PVID(0x8086, E1000_DEV_ID_PCH_D_HV_DM, "Intel(R) 82578DM"),
	PVID(0x8086, E1000_DEV_ID_PCH_D_HV_DC, "Intel(R) 82578DC"),
	PVID(0x8086, E1000_DEV_ID_PCH2_LV_LM, "Intel(R) 82579LM"),
	PVID(0x8086, E1000_DEV_ID_PCH2_LV_V, "Intel(R) 82579V"),
	PVID(0x8086, E1000_DEV_ID_PCH_LPT_I217_LM, "Intel(R) I217-LM LPT"),
	PVID(0x8086, E1000_DEV_ID_PCH_LPT_I217_V, "Intel(R) I217-V LPT"),
	PVID(0x8086, E1000_DEV_ID_PCH_LPTLP_I218_LM,
	    "Intel(R) I218-LM LPTLP"),
	PVID(0x8086, E1000_DEV_ID_PCH_LPTLP_I218_V, "Intel(R) I218-V LPTLP"),
	PVID(0x8086, E1000_DEV_ID_PCH_I218_LM2, "Intel(R) I218-LM (2)"),
	PVID(0x8086, E1000_DEV_ID_PCH_I218_V2, "Intel(R) I218-V (2)"),
	PVID(0x8086, E1000_DEV_ID_PCH_I218_LM3, "Intel(R) I218-LM (3)"),
	PVID(0x8086, E1000_DEV_ID_PCH_I218_V3, "Intel(R) I218-V (3)"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_LM, "Intel(R) I219-LM SPT"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_V, "Intel(R) I219-V SPT"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_LM2,
	    "Intel(R) I219-LM SPT-H(2)"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_V2,
	    "Intel(R) I219-V SPT-H(2)"),
	PVID(0x8086, E1000_DEV_ID_PCH_LBG_I219_LM3,
	    "Intel(R) I219-LM LBG(3)"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_LM4,
	    "Intel(R) I219-LM SPT(4)"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_V4, "Intel(R) I219-V SPT(4)"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_LM5,
	    "Intel(R) I219-LM SPT(5)"),
	PVID(0x8086, E1000_DEV_ID_PCH_SPT_I219_V5, "Intel(R) I219-V SPT(5)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CNP_I219_LM6,
	    "Intel(R) I219-LM CNP(6)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CNP_I219_V6, "Intel(R) I219-V CNP(6)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CNP_I219_LM7,
	    "Intel(R) I219-LM CNP(7)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CNP_I219_V7, "Intel(R) I219-V CNP(7)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ICP_I219_LM8,
	    "Intel(R) I219-LM ICP(8)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ICP_I219_V8, "Intel(R) I219-V ICP(8)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ICP_I219_LM9,
	    "Intel(R) I219-LM ICP(9)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ICP_I219_V9, "Intel(R) I219-V ICP(9)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CMP_I219_LM10,
	    "Intel(R) I219-LM CMP(10)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CMP_I219_V10,
	    "Intel(R) I219-V CMP(10)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CMP_I219_LM11,
	    "Intel(R) I219-LM CMP(11)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CMP_I219_V11,
	    "Intel(R) I219-V CMP(11)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CMP_I219_LM12,
	    "Intel(R) I219-LM CMP(12)"),
	PVID(0x8086, E1000_DEV_ID_PCH_CMP_I219_V12,
	    "Intel(R) I219-V CMP(12)"),
	PVID(0x8086, E1000_DEV_ID_PCH_TGP_I219_LM13,
	    "Intel(R) I219-LM TGP(13)"),
	PVID(0x8086, E1000_DEV_ID_PCH_TGP_I219_V13,
	    "Intel(R) I219-V TGP(13)"),
	PVID(0x8086, E1000_DEV_ID_PCH_TGP_I219_LM14,
	    "Intel(R) I219-LM TGP(14)"),
	PVID(0x8086, E1000_DEV_ID_PCH_TGP_I219_V14,
	    "Intel(R) I219-V GTP(14)"),
	PVID(0x8086, E1000_DEV_ID_PCH_TGP_I219_LM15,
	    "Intel(R) I219-LM TGP(15)"),
	PVID(0x8086, E1000_DEV_ID_PCH_TGP_I219_V15,
	    "Intel(R) I219-V TGP(15)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ADL_I219_LM16,
	    "Intel(R) I219-LM ADL(16)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ADL_I219_V16,
	    "Intel(R) I219-V ADL(16)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ADL_I219_LM17,
	    "Intel(R) I219-LM ADL(17)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ADL_I219_V17,
	    "Intel(R) I219-V ADL(17)"),
	PVID(0x8086, E1000_DEV_ID_PCH_MTP_I219_LM18,
	    "Intel(R) I219-LM MTP(18)"),
	PVID(0x8086, E1000_DEV_ID_PCH_MTP_I219_V18,
	    "Intel(R) I219-V MTP(18)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ADL_I219_LM19,
	    "Intel(R) I219-LM ADL(19)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ADL_I219_V19,
	    "Intel(R) I219-V ADL(19)"),
	PVID(0x8086, E1000_DEV_ID_PCH_LNL_I219_LM20,
	    "Intel(R) I219-LM LNL(20)"),
	PVID(0x8086, E1000_DEV_ID_PCH_LNL_I219_V20,
	    "Intel(R) I219-V LNL(20)"),
	PVID(0x8086, E1000_DEV_ID_PCH_LNL_I219_LM21,
	    "Intel(R) I219-LM LNL(21)"),
	PVID(0x8086, E1000_DEV_ID_PCH_LNL_I219_V21,
	    "Intel(R) I219-V LNL(21)"),
	PVID(0x8086, E1000_DEV_ID_PCH_RPL_I219_LM22,
	    "Intel(R) I219-LM RPL(22)"),
	PVID(0x8086, E1000_DEV_ID_PCH_RPL_I219_V22,
	    "Intel(R) I219-V RPL(22)"),
	PVID(0x8086, E1000_DEV_ID_PCH_RPL_I219_LM23,
	    "Intel(R) I219-LM RPL(23)"),
	PVID(0x8086, E1000_DEV_ID_PCH_RPL_I219_V23,
	    "Intel(R) I219-V RPL(23)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ARL_I219_LM24,
	    "Intel(R) I219-LM ARL(24)"),
	PVID(0x8086, E1000_DEV_ID_PCH_ARL_I219_V24,
	    "Intel(R) I219-V ARL(24)"),
	PVID(0x8086, E1000_DEV_ID_PCH_PTP_I219_LM25,
	    "Intel(R) I219-LM PTP(25)"),
	PVID(0x8086, E1000_DEV_ID_PCH_PTP_I219_V25,
	    "Intel(R) I219-V PTP(25)"),
	PVID(0x8086, E1000_DEV_ID_PCH_PTP_I219_LM26,
	    "Intel(R) I219-LM PTP(26)"),
	PVID(0x8086, E1000_DEV_ID_PCH_PTP_I219_V26,
	    "Intel(R) I219-V PTP(26)"),
	PVID(0x8086, E1000_DEV_ID_PCH_PTP_I219_LM27,
	    "Intel(R) I219-LM PTP(27)"),
	PVID(0x8086, E1000_DEV_ID_PCH_PTP_I219_V27,
	    "Intel(R) I219-V PTP(27)"),
	PVID(0x8086, E1000_DEV_ID_PCH_NVL_I219_LM29,
	    "Intel(R) I219-LM NVL(29)"),
	PVID(0x8086, E1000_DEV_ID_PCH_NVL_I219_V29,
	    "Intel(R) I219-V NVL(29)"),
	/* required last entry */
	PVID_END
};

static const pci_vendor_info_t igb_vendor_info_array[] =
{
	/* Intel(R) - igb-class devices */
	PVID(0x8086, E1000_DEV_ID_82575EB_COPPER,
	    "Intel(R) PRO/1000 82575EB (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82575EB_FIBER_SERDES,
	    "Intel(R) PRO/1000 82575EB (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82575GB_QUAD_COPPER,
	    "Intel(R) PRO/1000 VT 82575GB (Quad Copper)"),
	PVID(0x8086, E1000_DEV_ID_82576, "Intel(R) PRO/1000 82576"),
	PVID(0x8086, E1000_DEV_ID_82576_NS, "Intel(R) PRO/1000 82576NS"),
	PVID(0x8086, E1000_DEV_ID_82576_NS_SERDES,
	    "Intel(R) PRO/1000 82576NS (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82576_FIBER,
	    "Intel(R) PRO/1000 EF 82576 (Dual Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82576_SERDES,
	    "Intel(R) PRO/1000 82576 (Dual SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82576_SERDES_QUAD,
	    "Intel(R) PRO/1000 ET 82576 (Quad SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82576_QUAD_COPPER,
	    "Intel(R) PRO/1000 ET 82576 (Quad Copper)"),
	PVID(0x8086, E1000_DEV_ID_82576_QUAD_COPPER_ET2,
	    "Intel(R) PRO/1000 ET(2) 82576 (Quad Copper)"),
	PVID(0x8086, E1000_DEV_ID_82580_COPPER,
	    "Intel(R) I340 82580 (Copper)"),
	PVID(0x8086, E1000_DEV_ID_82580_FIBER, "Intel(R) I340 82580 (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_82580_SERDES,
	    "Intel(R) I340 82580 (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_82580_SGMII, "Intel(R) I340 82580 (SGMII)"),
	PVID(0x8086, E1000_DEV_ID_82580_COPPER_DUAL,
	    "Intel(R) I340-T2 82580 (Dual Copper)"),
	PVID(0x8086, E1000_DEV_ID_82580_QUAD_FIBER,
	    "Intel(R) I340-F4 82580 (Quad Fiber)"),
	PVID(0x8086, E1000_DEV_ID_DH89XXCC_SERDES,
	    "Intel(R) DH89XXCC (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_DH89XXCC_SGMII,
	    "Intel(R) I347-AT4 DH89XXCC"),
	PVID(0x8086, E1000_DEV_ID_DH89XXCC_SFP, "Intel(R) DH89XXCC (SFP)"),
	PVID(0x8086, E1000_DEV_ID_DH89XXCC_BACKPLANE,
	    "Intel(R) DH89XXCC (Backplane)"),
	PVID(0x8086, E1000_DEV_ID_I350_COPPER, "Intel(R) I350 (Copper)"),
	PVID(0x8086, E1000_DEV_ID_I350_FIBER, "Intel(R) I350 (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_I350_SERDES, "Intel(R) I350 (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_I350_SGMII, "Intel(R) I350 (SGMII)"),
	PVID(0x8086, E1000_DEV_ID_I210_COPPER, "Intel(R) I210 (Copper)"),
	PVID(0x8086, E1000_DEV_ID_I210_COPPER_IT,
	    "Intel(R) I210 IT (Copper)"),
	PVID(0x8086, E1000_DEV_ID_I210_COPPER_OEM1, "Intel(R) I210 (OEM)"),
	PVID(0x8086, E1000_DEV_ID_I210_COPPER_FLASHLESS,
	    "Intel(R) I210 Flashless (Copper)"),
	PVID(0x8086, E1000_DEV_ID_I210_SERDES_FLASHLESS,
	    "Intel(R) I210 Flashless (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_I210_SGMII_FLASHLESS,
	    "Intel(R) I210 Flashless (SGMII)"),
	PVID(0x8086, E1000_DEV_ID_I210_FIBER, "Intel(R) I210 (Fiber)"),
	PVID(0x8086, E1000_DEV_ID_I210_SERDES, "Intel(R) I210 (SERDES)"),
	PVID(0x8086, E1000_DEV_ID_I210_SGMII, "Intel(R) I210 (SGMII)"),
	PVID(0x8086, E1000_DEV_ID_I211_COPPER, "Intel(R) I211 (Copper)"),
	PVID(0x8086, E1000_DEV_ID_I354_BACKPLANE_1GBPS,
	    "Intel(R) I354 (1.0 GbE Backplane)"),
	PVID(0x8086, E1000_DEV_ID_I354_BACKPLANE_2_5GBPS,
	    "Intel(R) I354 (2.5 GbE Backplane)"),
	PVID(0x8086, E1000_DEV_ID_I354_SGMII, "Intel(R) I354 (SGMII)"),
	/* required last entry */
	PVID_END
};

static const pci_vendor_info_t igbv_vendor_info_array[] = {
	PVID(0x8086, E1000_DEV_ID_82576_VF,
	    "Intel(R) PRO/1000 82576 Virtual Function"),
	PVID(0x8086, E1000_DEV_ID_82576_VF_HV,
	    "Intel(R) PRO/1000 82576 Virtual Function"),
	PVID(0x8086, E1000_DEV_ID_I350_VF,
	    "Intel(R) I350 Virtual Function"),
	PVID(0x8086, E1000_DEV_ID_I350_VF_HV,
	    "Intel(R) I350 Virtual Function"),
	PVID_END
};

/*********************************************************************
 *  Function prototypes
 *********************************************************************/
static void	*em_register(device_t);
static void	*igb_register(device_t);
static void	*igbv_register(device_t);
static int	igb_device_attach(device_t);
#ifdef PCI_IOV
static int	igb_device_iov_init(device_t, uint16_t, const nvlist_t *);
static void	igb_device_iov_uninit(device_t);
#endif
static int	em_if_detach(if_ctx_t);
static int	em_if_shutdown(if_ctx_t);
static int	em_if_suspend(if_ctx_t);
static int	em_if_resume(if_ctx_t);

static int	em_if_tx_queues_alloc(if_ctx_t, caddr_t *, uint64_t *, int,
    int);
static int	em_if_rx_queues_alloc(if_ctx_t, caddr_t *, uint64_t *, int,
    int);
static void	em_if_queues_free(if_ctx_t);

static uint64_t	em_if_get_vf_counter(if_ctx_t, ift_counter);
static uint64_t	em_if_get_counter(if_ctx_t, ift_counter);
static void	em_if_init(if_ctx_t);
static void	em_if_stop(if_ctx_t);
static void	em_fence_pci_busmaster(struct e1000_softc *);
static int	em_enable_pci_busmaster(struct e1000_softc *);
static void	em_if_media_status(if_ctx_t, struct ifmediareq *);
static int	em_if_media_change(if_ctx_t);
static int	em_if_mtu_set(if_ctx_t, uint32_t);
static void	em_if_timer(if_ctx_t, uint16_t);
static void	em_if_vlan_register(if_ctx_t, u16);
static void	em_if_vlan_unregister(if_ctx_t, u16);
static bool	em_if_needs_restart(if_ctx_t, enum iflib_restart_event);

static void	em_identify_hardware(if_ctx_t);
static int	em_allocate_pci_resources(if_ctx_t);
static void	em_free_pci_resources(if_ctx_t);
static int	em_reset(if_ctx_t);
static int	em_setup_interface(if_ctx_t);
static int	em_setup_msix(if_ctx_t);

static void	em_initialize_transmit_unit(if_ctx_t);
static void	em_initialize_receive_unit(if_ctx_t);

static void	em_if_intr_enable(if_ctx_t);
static void	em_if_intr_disable(if_ctx_t);
static void	igb_if_intr_enable(if_ctx_t);
static void	igb_if_intr_disable(if_ctx_t);
static int	em_if_rx_queue_intr_enable(if_ctx_t, uint16_t);
static int	em_if_tx_queue_intr_enable(if_ctx_t, uint16_t);
static int	igb_if_rx_queue_intr_enable(if_ctx_t, uint16_t);
static int	igb_if_tx_queue_intr_enable(if_ctx_t, uint16_t);
static void	em_handle_fatal_error_intr(struct e1000_softc *, u32);
static bool	em_handle_fatal_error_admin(struct e1000_softc *);
static u32	igb_device_reset_intr_mask(struct e1000_softc *);
static bool	igb_device_reset_pending(struct e1000_softc *);
static bool	igb_handle_device_reset(struct e1000_softc *, u32);
static void	igb_prepare_device_reset(struct e1000_softc *);
static bool	igb_finish_device_reset(struct e1000_softc *, u32);
static void	em_prepare_fatal_error_reset(struct e1000_softc *);
static void	em_finish_fatal_error_reset(struct e1000_softc *);
static void	em_configure_peind_memory_errors(struct e1000_softc *);
static void	em_configure_82575_memory_errors(struct e1000_softc *);
static void	em_configure_82580_memory_errors(struct e1000_softc *);
static void	em_update_82580_ecc_stats(struct e1000_softc *, u32, u32,
		    u32);
static void	em_if_multi_set(if_ctx_t);
static void	em_if_update_admin_status(if_ctx_t);
static void	em_if_debug(if_ctx_t);
static void	em_initialize_vf_stats(struct e1000_softc *);
static void	em_rebase_vf_stats(struct e1000_softc *);
static void	em_update_vf_stats_counters(struct e1000_softc *);
static void	em_add_hw_stats(struct e1000_softc *);
static bool	em_mac_has_eee(enum e1000_mac_type);
static int	em_if_set_promisc(if_ctx_t, int);
static bool	em_if_defer_promisc(struct e1000_softc *);
static bool	em_if_vlan_filter_capable(if_ctx_t);
static bool	em_if_vlan_filter_used(if_ctx_t);
static void	em_if_vlan_filter_enable(struct e1000_softc *);
static void	em_if_vlan_filter_disable(struct e1000_softc *);
static void	em_if_vlan_filter_write(struct e1000_softc *, int);
static void	em_setup_vlan_hw_support(if_ctx_t ctx);
static int	em_sysctl_nvm_info(SYSCTL_HANDLER_ARGS);
static void	em_print_nvm_info(struct e1000_softc *);
static void	em_fw_version_locked(if_ctx_t);
static void	em_sbuf_fw_version(struct e1000_fw_version *, struct sbuf *);
static void	em_print_fw_version(struct e1000_softc *);
static int	em_sysctl_print_fw_version(SYSCTL_HANDLER_ARGS);
static int	em_sysctl_debug_info(SYSCTL_HANDLER_ARGS);
static int	em_get_rs(SYSCTL_HANDLER_ARGS);
static void	em_print_debug_info(struct e1000_softc *);
static void	em_newitr(struct e1000_softc *, struct em_rx_queue *,
    struct rx_ring *);
static bool	em_automask_tso(if_ctx_t);
static int	em_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS);
static int	em_sysctl_int_delay(SYSCTL_HANDLER_ARGS);
static void	em_add_int_delay_sysctl(struct e1000_softc *, const char *,
    const char *, struct em_int_delay_info *, int, int);
/* Management and WOL Support */
static void	em_init_manageability(struct e1000_softc *);
static void	em_release_manageability(struct e1000_softc *);
static void	em_get_hw_control(struct e1000_softc *);
static void	em_release_hw_control(struct e1000_softc *);
static void	em_get_wakeup(if_ctx_t);
static void	em_fill_wakeup_mta(struct e1000_hw *);
static int	em_enable_wakeup(if_ctx_t);
static void	em_configure_sx_low_power(struct e1000_softc *, u32);
static int	em_enable_phy_wakeup(struct e1000_softc *, u32);
static int	em_disable_phy_wakeup(struct e1000_softc *, u16 *);
static void	em_power_up_wakeup_link(struct e1000_softc *);
static void	em_power_down_wakeup_link(struct e1000_softc *);
static void	em_disable_aspm(struct e1000_softc *);

int		em_intr(void *);

enum em_fatal_error_state {
	EM_FATAL_ERROR_NONE,
	EM_FATAL_ERROR_CAPTURING,
	EM_FATAL_ERROR_DETECTED,
	EM_FATAL_ERROR_RESET_REQUESTED,
	EM_FATAL_ERROR_RESET_PREPARED,
};

enum igb_device_reset_state {
	IGB_DEVICE_RESET_NONE,
	IGB_DEVICE_RESET_DETECTED,
	IGB_DEVICE_RESET_REQUESTED,
	IGB_DEVICE_RESET_PREPARED,
};

#define IGB_DEVICE_RESET_TIMEOUT_MS	100

/* MSI-X handlers */
static int	em_if_msix_intr_assign(if_ctx_t, int);
static int	em_msix_link(void *);
static void	em_handle_link(void *);

static void	em_enable_vectors_82574(if_ctx_t);

static int	em_set_flowcntl(SYSCTL_HANDLER_ARGS);
static int	em_sysctl_eee(SYSCTL_HANDLER_ARGS);
static int	igb_sysctl_dmac(SYSCTL_HANDLER_ARGS);
static void	em_if_led_func(if_ctx_t, int);

static int	em_get_regs(SYSCTL_HANDLER_ARGS);
static void	lem_smartspeed(struct e1000_softc *);
static void	igb_configure_queues(struct e1000_softc *);
static void	igb_initialize_interrupt_rate(struct e1000_softc *);
static void	em_flush_desc_rings(struct e1000_softc *);


/*********************************************************************
 *  FreeBSD Device Interface Entry Points
 *********************************************************************/
static device_method_t em_methods[] = {
	/* Device interface */
	DEVMETHOD(device_register, em_register),
	DEVMETHOD(device_probe, iflib_device_probe),
	DEVMETHOD(device_attach, iflib_device_attach),
	DEVMETHOD(device_detach, iflib_device_detach),
	DEVMETHOD(device_shutdown, iflib_device_shutdown),
	DEVMETHOD(device_suspend, iflib_device_suspend),
	DEVMETHOD(device_resume, iflib_device_resume),
	DEVMETHOD_END
};

static device_method_t igb_methods[] = {
	/* Device interface */
	DEVMETHOD(device_register, igb_register),
	DEVMETHOD(device_probe, iflib_device_probe),
	DEVMETHOD(device_attach, igb_device_attach),
	DEVMETHOD(device_detach, iflib_device_detach),
	DEVMETHOD(device_shutdown, iflib_device_shutdown),
	DEVMETHOD(device_suspend, iflib_device_suspend),
	DEVMETHOD(device_resume, iflib_device_resume),
#ifdef PCI_IOV
	DEVMETHOD(pci_iov_init, igb_device_iov_init),
	DEVMETHOD(pci_iov_uninit, igb_device_iov_uninit),
	DEVMETHOD(pci_iov_add_vf, iflib_device_iov_add_vf),
#endif
	DEVMETHOD_END
};

static device_method_t igbv_methods[] = {
	/* Device interface */
	DEVMETHOD(device_register, igbv_register),
	DEVMETHOD(device_probe, iflib_device_probe),
	DEVMETHOD(device_attach, iflib_device_attach),
	DEVMETHOD(device_detach, iflib_device_detach),
	DEVMETHOD(device_shutdown, iflib_device_shutdown),
	DEVMETHOD(device_suspend, iflib_device_suspend),
	DEVMETHOD(device_resume, iflib_device_resume),
	DEVMETHOD_END
};


static driver_t em_driver = {
	"em", em_methods, sizeof(struct e1000_softc),
};

DRIVER_MODULE(em, pci, em_driver, 0, 0);

MODULE_DEPEND(em, pci, 1, 1, 1);
MODULE_DEPEND(em, ether, 1, 1, 1);
MODULE_DEPEND(em, iflib, 1, 1, 1);

IFLIB_PNP_INFO(pci, em, em_vendor_info_array);

static driver_t igb_driver = {
	"igb", igb_methods, sizeof(struct e1000_softc),
};

DRIVER_MODULE(igb, pci, igb_driver, 0, 0);

MODULE_DEPEND(igb, pci, 1, 1, 1);
MODULE_DEPEND(igb, ether, 1, 1, 1);
MODULE_DEPEND(igb, iflib, 1, 1, 1);

IFLIB_PNP_INFO(pci, igb, igb_vendor_info_array);

static driver_t igbv_driver = {
	"igbv", igbv_methods, sizeof(struct e1000_softc),
};

DRIVER_MODULE(igbv, pci, igbv_driver, 0, 0);

MODULE_DEPEND(igbv, pci, 1, 1, 1);
MODULE_DEPEND(igbv, ether, 1, 1, 1);
MODULE_DEPEND(igbv, iflib, 1, 1, 1);

IFLIB_PNP_INFO(pci, igbv_driver, igbv_vendor_info_array);

static device_method_t em_if_methods[] = {
	DEVMETHOD(ifdi_attach_pre, em_if_attach_pre),
	DEVMETHOD(ifdi_attach_post, em_if_attach_post),
	DEVMETHOD(ifdi_detach, em_if_detach),
	DEVMETHOD(ifdi_shutdown, em_if_shutdown),
	DEVMETHOD(ifdi_suspend, em_if_suspend),
	DEVMETHOD(ifdi_resume, em_if_resume),
	DEVMETHOD(ifdi_init, em_if_init),
	DEVMETHOD(ifdi_stop, em_if_stop),
	DEVMETHOD(ifdi_msix_intr_assign, em_if_msix_intr_assign),
	DEVMETHOD(ifdi_intr_enable, em_if_intr_enable),
	DEVMETHOD(ifdi_intr_disable, em_if_intr_disable),
	DEVMETHOD(ifdi_tx_queues_alloc, em_if_tx_queues_alloc),
	DEVMETHOD(ifdi_rx_queues_alloc, em_if_rx_queues_alloc),
	DEVMETHOD(ifdi_queues_free, em_if_queues_free),
	DEVMETHOD(ifdi_update_admin_status, em_if_update_admin_status),
	DEVMETHOD(ifdi_multi_set, em_if_multi_set),
	DEVMETHOD(ifdi_media_status, em_if_media_status),
	DEVMETHOD(ifdi_media_change, em_if_media_change),
	DEVMETHOD(ifdi_mtu_set, em_if_mtu_set),
	DEVMETHOD(ifdi_promisc_set, em_if_set_promisc),
	DEVMETHOD(ifdi_timer, em_if_timer),
	DEVMETHOD(ifdi_vlan_register, em_if_vlan_register),
	DEVMETHOD(ifdi_vlan_unregister, em_if_vlan_unregister),
	DEVMETHOD(ifdi_get_counter, em_if_get_counter),
	DEVMETHOD(ifdi_led_func, em_if_led_func),
	DEVMETHOD(ifdi_rx_queue_intr_enable, em_if_rx_queue_intr_enable),
	DEVMETHOD(ifdi_tx_queue_intr_enable, em_if_tx_queue_intr_enable),
	DEVMETHOD(ifdi_debug, em_if_debug),
	DEVMETHOD(ifdi_needs_restart, em_if_needs_restart),
	DEVMETHOD_END
};

static driver_t em_if_driver = {
	"em_if", em_if_methods, sizeof(struct e1000_softc)
};

static device_method_t igb_if_methods[] = {
	DEVMETHOD(ifdi_attach_pre, em_if_attach_pre),
	DEVMETHOD(ifdi_attach_post, em_if_attach_post),
	DEVMETHOD(ifdi_detach, em_if_detach),
	DEVMETHOD(ifdi_shutdown, em_if_shutdown),
	DEVMETHOD(ifdi_suspend, em_if_suspend),
	DEVMETHOD(ifdi_resume, em_if_resume),
	DEVMETHOD(ifdi_init, em_if_init),
	DEVMETHOD(ifdi_stop, em_if_stop),
	DEVMETHOD(ifdi_msix_intr_assign, em_if_msix_intr_assign),
	DEVMETHOD(ifdi_intr_enable, igb_if_intr_enable),
	DEVMETHOD(ifdi_intr_disable, igb_if_intr_disable),
	DEVMETHOD(ifdi_tx_queues_alloc, em_if_tx_queues_alloc),
	DEVMETHOD(ifdi_rx_queues_alloc, em_if_rx_queues_alloc),
	DEVMETHOD(ifdi_queues_free, em_if_queues_free),
	DEVMETHOD(ifdi_update_admin_status, em_if_update_admin_status),
	DEVMETHOD(ifdi_multi_set, em_if_multi_set),
	DEVMETHOD(ifdi_media_status, em_if_media_status),
	DEVMETHOD(ifdi_media_change, em_if_media_change),
	DEVMETHOD(ifdi_mtu_set, em_if_mtu_set),
	DEVMETHOD(ifdi_promisc_set, em_if_set_promisc),
	DEVMETHOD(ifdi_timer, em_if_timer),
	DEVMETHOD(ifdi_vlan_register, em_if_vlan_register),
	DEVMETHOD(ifdi_vlan_unregister, em_if_vlan_unregister),
	DEVMETHOD(ifdi_get_counter, em_if_get_counter),
	DEVMETHOD(ifdi_led_func, em_if_led_func),
	DEVMETHOD(ifdi_rx_queue_intr_enable, igb_if_rx_queue_intr_enable),
	DEVMETHOD(ifdi_tx_queue_intr_enable, igb_if_tx_queue_intr_enable),
	DEVMETHOD(ifdi_debug, em_if_debug),
	DEVMETHOD(ifdi_needs_restart, em_if_needs_restart),
#ifdef PCI_IOV
	DEVMETHOD(ifdi_iov_init, igb_if_iov_init),
	DEVMETHOD(ifdi_iov_uninit, igb_if_iov_uninit),
	DEVMETHOD(ifdi_iov_vf_add, igb_if_iov_vf_add),
#endif
	DEVMETHOD_END
};

static driver_t igb_if_driver = {
	"igb_if", igb_if_methods, sizeof(struct e1000_softc)
};

static device_method_t igbv_if_methods[] = {
	DEVMETHOD(ifdi_attach_pre, igbv_if_attach_pre),
	DEVMETHOD(ifdi_attach_post, igbv_if_attach_post),
	DEVMETHOD(ifdi_detach, em_if_detach),
	DEVMETHOD(ifdi_shutdown, em_if_shutdown),
	DEVMETHOD(ifdi_suspend, em_if_suspend),
	DEVMETHOD(ifdi_resume, em_if_resume),
	DEVMETHOD(ifdi_init, em_if_init),
	DEVMETHOD(ifdi_stop, em_if_stop),
	DEVMETHOD(ifdi_msix_intr_assign, em_if_msix_intr_assign),
	DEVMETHOD(ifdi_intr_enable, igbv_if_intr_enable),
	DEVMETHOD(ifdi_intr_disable, igbv_if_intr_disable),
	DEVMETHOD(ifdi_tx_queues_alloc, em_if_tx_queues_alloc),
	DEVMETHOD(ifdi_rx_queues_alloc, em_if_rx_queues_alloc),
	DEVMETHOD(ifdi_queues_free, em_if_queues_free),
	DEVMETHOD(ifdi_update_admin_status, igbv_if_update_admin_status),
	DEVMETHOD(ifdi_multi_set, em_if_multi_set),
	DEVMETHOD(ifdi_media_status, em_if_media_status),
	DEVMETHOD(ifdi_media_change, igbv_if_media_change),
	DEVMETHOD(ifdi_mtu_set, em_if_mtu_set),
	DEVMETHOD(ifdi_promisc_set, em_if_set_promisc),
	DEVMETHOD(ifdi_timer, em_if_timer),
	DEVMETHOD(ifdi_vlan_register, em_if_vlan_register),
	DEVMETHOD(ifdi_vlan_unregister, em_if_vlan_unregister),
	DEVMETHOD(ifdi_get_counter, em_if_get_counter),
	DEVMETHOD(ifdi_rx_queue_intr_enable, igb_if_rx_queue_intr_enable),
	DEVMETHOD(ifdi_tx_queue_intr_enable, igb_if_tx_queue_intr_enable),
	DEVMETHOD(ifdi_debug, em_if_debug),
	DEVMETHOD(ifdi_needs_restart, em_if_needs_restart),
	DEVMETHOD_END
};

static driver_t igbv_if_driver = {
	"igbv_if", igbv_if_methods, sizeof(struct e1000_softc)
};

/*********************************************************************
 *  Tunable default values.
 *********************************************************************/

#define EM_TICKS_TO_USECS(ticks)	((1024 * (ticks) + 500) / 1000)
#define EM_USECS_TO_TICKS(usecs)	((1000 * (usecs) + 512) / 1024)

/* Allow common code without TSO */
#ifndef CSUM_TSO
#define CSUM_TSO	0
#endif

static SYSCTL_NODE(_hw, OID_AUTO, em, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "EM driver parameters");

static int em_disable_crc_stripping = 0;
SYSCTL_INT(_hw_em, OID_AUTO, disable_crc_stripping, CTLFLAG_RDTUN,
    &em_disable_crc_stripping, 0, "Disable CRC Stripping");

static int em_tx_int_delay_dflt = EM_TICKS_TO_USECS(EM_TIDV);
static int em_rx_int_delay_dflt = EM_TICKS_TO_USECS(EM_RDTR);
SYSCTL_INT(_hw_em, OID_AUTO, tx_int_delay, CTLFLAG_RDTUN,
    &em_tx_int_delay_dflt, 0, "Default transmit interrupt delay in usecs");
SYSCTL_INT(_hw_em, OID_AUTO, rx_int_delay, CTLFLAG_RDTUN,
    &em_rx_int_delay_dflt, 0, "Default receive interrupt delay in usecs");

static int em_tx_abs_int_delay_dflt = EM_TICKS_TO_USECS(EM_TADV);
static int em_rx_abs_int_delay_dflt = EM_TICKS_TO_USECS(EM_RADV);
SYSCTL_INT(_hw_em, OID_AUTO, tx_abs_int_delay, CTLFLAG_RDTUN,
    &em_tx_abs_int_delay_dflt, 0,
    "Default transmit interrupt delay limit in usecs");
SYSCTL_INT(_hw_em, OID_AUTO, rx_abs_int_delay, CTLFLAG_RDTUN,
    &em_rx_abs_int_delay_dflt, 0,
    "Default receive interrupt delay limit in usecs");

static int em_smart_pwr_down = false;
SYSCTL_INT(_hw_em, OID_AUTO, smart_pwr_down, CTLFLAG_RDTUN,
    &em_smart_pwr_down,
    0, "Set to true to leave smart power down enabled on newer adapters");

static bool em_unsupported_tso = false;
SYSCTL_BOOL(_hw_em, OID_AUTO, unsupported_tso, CTLFLAG_RDTUN,
    &em_unsupported_tso, 0, "Allow unsupported em(4) TSO configurations");

/* Controls whether promiscuous also shows bad packets */
static int em_debug_sbp = false;
SYSCTL_INT(_hw_em, OID_AUTO, sbp, CTLFLAG_RDTUN, &em_debug_sbp, 0,
    "Show bad packets in promiscuous mode");

/* Energy efficient ethernet - default to OFF */
static int eee_setting = 1;
SYSCTL_INT(_hw_em, OID_AUTO, eee_setting, CTLFLAG_RDTUN, &eee_setting, 0,
    "Enable Energy Efficient Ethernet");

/*
 * AIM: Adaptive Interrupt Moderation
 * which means that the interrupt rate is varied over time based on the
 * traffic for that interrupt vector
 */
static int em_enable_aim = 1;
SYSCTL_INT(_hw_em, OID_AUTO, enable_aim, CTLFLAG_RWTUN, &em_enable_aim,
    0, "Enable adaptive interrupt moderation (1=normal, 2=lowlatency)");

/*
** Tuneable Interrupt rate
*/
static int em_max_interrupt_rate = EM_INTS_DEFAULT;
SYSCTL_INT(_hw_em, OID_AUTO, max_interrupt_rate, CTLFLAG_RDTUN,
    &em_max_interrupt_rate, 0, "Maximum interrupts per second");

/* Global used in WOL setup with multiport cards */
static int global_quad_port_a = 0;

extern struct if_txrx igb_txrx;
extern struct if_txrx em_txrx;
extern struct if_txrx lem_txrx;

static struct if_shared_ctx em_sctx_init = {
	.isc_magic = IFLIB_MAGIC,
	.isc_q_align = PAGE_SIZE,
	.isc_tx_maxsize = EM_TSO_SIZE + sizeof(struct ether_vlan_header),
	.isc_tx_maxsegsize = PAGE_SIZE,
	.isc_tso_maxsize = EM_TSO_SIZE + sizeof(struct ether_vlan_header),
	.isc_tso_maxsegsize = EM_TSO_SEG_SIZE,
	.isc_rx_maxsize = MJUM9BYTES,
	.isc_rx_nsegments = 1,
	.isc_rx_maxsegsize = MJUM9BYTES,
	.isc_nfl = 1,
	.isc_nrxqs = 1,
	.isc_ntxqs = 1,
	.isc_admin_intrcnt = 1,
	.isc_vendor_info = em_vendor_info_array,
	.isc_driver_version = em_driver_version,
	.isc_driver = &em_if_driver,
	.isc_flags =
	    IFLIB_NEED_SCRATCH | IFLIB_TSO_INIT_IP | IFLIB_NEED_ZERO_CSUM,

	.isc_nrxd_min = {EM_MIN_RXD},
	.isc_ntxd_min = {EM_MIN_TXD},
	.isc_nrxd_max = {EM_MAX_RXD},
	.isc_ntxd_max = {EM_MAX_TXD},
	.isc_nrxd_default = {EM_DEFAULT_RXD},
	.isc_ntxd_default = {EM_DEFAULT_TXD},
};

static struct if_shared_ctx igb_sctx_init = {
	.isc_magic = IFLIB_MAGIC,
	.isc_q_align = PAGE_SIZE,
	.isc_tx_maxsize = EM_TSO_SIZE + sizeof(struct ether_vlan_header),
	.isc_tx_maxsegsize = PAGE_SIZE,
	.isc_tso_maxsize = EM_TSO_SIZE + sizeof(struct ether_vlan_header),
	.isc_tso_maxsegsize = EM_TSO_SEG_SIZE,
	.isc_rx_maxsize = MJUM9BYTES,
	.isc_rx_nsegments = 1,
	.isc_rx_maxsegsize = MJUM9BYTES,
	.isc_nfl = 1,
	.isc_nrxqs = 1,
	.isc_ntxqs = 1,
	.isc_admin_intrcnt = 1,
	.isc_vendor_info = igb_vendor_info_array,
	.isc_driver_version = igb_driver_version,
	.isc_driver = &igb_if_driver,
	.isc_flags =
	    IFLIB_NEED_SCRATCH | IFLIB_TSO_INIT_IP | IFLIB_NEED_ZERO_CSUM,

	.isc_nrxd_min = {EM_MIN_RXD},
	.isc_ntxd_min = {EM_MIN_TXD},
	.isc_nrxd_max = {IGB_MAX_RXD},
	.isc_ntxd_max = {IGB_MAX_TXD},
	.isc_nrxd_default = {EM_DEFAULT_RXD},
	.isc_ntxd_default = {EM_DEFAULT_TXD},
};

/*
 * igb PFs and igbv VFs share the common datapath implementation.  Keep a
 * separate ifdi policy for VFs so they cannot inherit PF-only callbacks or
 * interrupt modes.
 */
static struct if_shared_ctx igbv_sctx_init = {
	.isc_magic = IFLIB_MAGIC,
	.isc_q_align = PAGE_SIZE,
	.isc_tx_maxsize = EM_TSO_SIZE + sizeof(struct ether_vlan_header),
	.isc_tx_maxsegsize = PAGE_SIZE,
	.isc_tso_maxsize = EM_TSO_SIZE + sizeof(struct ether_vlan_header),
	.isc_tso_maxsegsize = EM_TSO_SEG_SIZE,
	.isc_rx_maxsize = MJUM9BYTES,
	.isc_rx_nsegments = 1,
	.isc_rx_maxsegsize = MJUM9BYTES,
	.isc_nfl = 1,
	.isc_nrxqs = 1,
	.isc_ntxqs = 1,
	.isc_admin_intrcnt = 1,
	.isc_vendor_info = igbv_vendor_info_array,
	.isc_driver_version = igb_driver_version,
	.isc_driver = &igbv_if_driver,
	.isc_flags =
	    IFLIB_NEED_SCRATCH | IFLIB_TSO_INIT_IP | IFLIB_NEED_ZERO_CSUM |
	    IFLIB_IS_VF,

	.isc_nrxd_min = {EM_MIN_RXD},
	.isc_ntxd_min = {EM_MIN_TXD},
	.isc_nrxd_max = {IGB_MAX_RXD},
	.isc_ntxd_max = {IGB_MAX_TXD},
	.isc_nrxd_default = {EM_DEFAULT_RXD},
	.isc_ntxd_default = {EM_DEFAULT_TXD},
};

/*****************************************************************
 *
 * Dump Registers
 *
 ****************************************************************/
#define IGB_REGS_LEN 739

static int em_get_regs(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc = (struct e1000_softc *)arg1;
	struct e1000_hw *hw = &sc->hw;
	struct sbuf *sb;
	u32 *regs_buff;
	int rc;
	uint32_t rxqid, txqid;

	/*
	 * This sysctl is registered before iflib allocates the queue arrays,
	 * and remains registered while iflib tears them down.
	 */
	if (sc->rx_queues == NULL || sc->tx_queues == NULL)
		return (ENXIO);

	regs_buff = malloc(sizeof(u32) * IGB_REGS_LEN, M_DEVBUF, M_WAITOK);
	memset(regs_buff, 0, IGB_REGS_LEN * sizeof(u32));
	rxqid = sc->rx_queues[0].rxr.me;
	txqid = sc->tx_queues[0].txr.me;

	rc = sysctl_wire_old_buffer(req, 0);
	MPASS(rc == 0);
	if (rc != 0) {
		free(regs_buff, M_DEVBUF);
		return (rc);
	}

	sb = sbuf_new_for_sysctl(NULL, NULL, 32*400, req);
	MPASS(sb != NULL);
	if (sb == NULL) {
		free(regs_buff, M_DEVBUF);
		return (ENOMEM);
	}

	/* General Registers */
	regs_buff[0] = E1000_READ_REG(hw, E1000_CTRL);
	regs_buff[1] = E1000_READ_REG(hw, E1000_STATUS);
	regs_buff[2] = E1000_READ_REG(hw, E1000_CTRL_EXT);
	regs_buff[3] = E1000_READ_REG(hw, E1000_ICR);
	regs_buff[4] = E1000_READ_REG(hw, E1000_RCTL);
	regs_buff[5] = E1000_READ_REG(hw, E1000_RDLEN(rxqid));
	regs_buff[6] = E1000_READ_REG(hw, E1000_RDH(rxqid));
	regs_buff[7] = E1000_READ_REG(hw, E1000_RDT(rxqid));
	regs_buff[8] = E1000_READ_REG(hw, E1000_RXDCTL(rxqid));
	regs_buff[9] = E1000_READ_REG(hw, E1000_RDBAL(rxqid));
	regs_buff[10] = E1000_READ_REG(hw, E1000_RDBAH(rxqid));
	regs_buff[11] = E1000_READ_REG(hw, E1000_TCTL);
	regs_buff[12] = E1000_READ_REG(hw, E1000_TDBAL(txqid));
	regs_buff[13] = E1000_READ_REG(hw, E1000_TDBAH(txqid));
	regs_buff[14] = E1000_READ_REG(hw, E1000_TDLEN(txqid));
	regs_buff[15] = E1000_READ_REG(hw, E1000_TDH(txqid));
	regs_buff[16] = E1000_READ_REG(hw, E1000_TDT(txqid));
	regs_buff[17] = E1000_READ_REG(hw, E1000_TXDCTL(txqid));
	regs_buff[18] = E1000_READ_REG(hw, E1000_TDFH);
	regs_buff[19] = E1000_READ_REG(hw, E1000_TDFT);
	regs_buff[20] = E1000_READ_REG(hw, E1000_TDFHS);
	regs_buff[21] = E1000_READ_REG(hw, E1000_TDFPC);

	sbuf_printf(sb, "General Registers\n");
	sbuf_printf(sb, "\tCTRL\t %08x\n", regs_buff[0]);
	sbuf_printf(sb, "\tSTATUS\t %08x\n", regs_buff[1]);
	sbuf_printf(sb, "\tCTRL_EXT\t %08x\n\n", regs_buff[2]);

	sbuf_printf(sb, "Interrupt Registers\n");
	sbuf_printf(sb, "\tICR\t %08x\n\n", regs_buff[3]);

	sbuf_printf(sb, "RX Registers\n");
	sbuf_printf(sb, "\tRCTL\t %08x\n", regs_buff[4]);
	sbuf_printf(sb, "\tRDLEN\t %08x\n", regs_buff[5]);
	sbuf_printf(sb, "\tRDH\t %08x\n", regs_buff[6]);
	sbuf_printf(sb, "\tRDT\t %08x\n", regs_buff[7]);
	sbuf_printf(sb, "\tRXDCTL\t %08x\n", regs_buff[8]);
	sbuf_printf(sb, "\tRDBAL\t %08x\n", regs_buff[9]);
	sbuf_printf(sb, "\tRDBAH\t %08x\n\n", regs_buff[10]);

	sbuf_printf(sb, "TX Registers\n");
	sbuf_printf(sb, "\tTCTL\t %08x\n", regs_buff[11]);
	sbuf_printf(sb, "\tTDBAL\t %08x\n", regs_buff[12]);
	sbuf_printf(sb, "\tTDBAH\t %08x\n", regs_buff[13]);
	sbuf_printf(sb, "\tTDLEN\t %08x\n", regs_buff[14]);
	sbuf_printf(sb, "\tTDH\t %08x\n", regs_buff[15]);
	sbuf_printf(sb, "\tTDT\t %08x\n", regs_buff[16]);
	sbuf_printf(sb, "\tTXDCTL\t %08x\n", regs_buff[17]);
	sbuf_printf(sb, "\tTDFH\t %08x\n", regs_buff[18]);
	sbuf_printf(sb, "\tTDFT\t %08x\n", regs_buff[19]);
	sbuf_printf(sb, "\tTDFHS\t %08x\n", regs_buff[20]);
	sbuf_printf(sb, "\tTDFPC\t %08x\n\n", regs_buff[21]);

	free(regs_buff, M_DEVBUF);

#ifdef DUMP_DESCS
	{
		if_softc_ctx_t scctx = sc->shared;
		struct rx_ring *rxr = &rx_que->rxr;
		struct tx_ring *txr = &tx_que->txr;
		int ntxd = scctx->isc_ntxd[0];
		int nrxd = scctx->isc_nrxd[0];
		int j;

	for (j = 0; j < nrxd; j++) {
		u32 staterr = le32toh(rxr->rx_base[j].wb.upper.status_error);
		u32 length =  le32toh(rxr->rx_base[j].wb.upper.length);
		sbuf_printf(sb, "\tReceive Descriptor Address %d: %08"
		    PRIx64 "  Error:%d  Length:%d\n",
		    j, rxr->rx_base[j].read.buffer_addr, staterr, length);
	}

	for (j = 0; j < min(ntxd, 256); j++) {
		unsigned int *ptr = (unsigned int *)&txr->tx_base[j];

		sbuf_printf(sb,
		    "\tTXD[%03d] [0]: %08x [1]: %08x [2]: %08x [3]: %08x"
		    "  eop: %d DD=%d\n",
		    j, ptr[0], ptr[1], ptr[2], ptr[3], buf->eop,
		    buf->eop != -1 ?
		    txr->tx_base[buf->eop].upper.fields.status &
		    E1000_TXD_STAT_DD : 0);

	}
	}
#endif

	rc = sbuf_finish(sb);
	sbuf_delete(sb);
	return(rc);
}

static void *
em_register(device_t dev)
{
	return (&em_sctx_init);
}

static void *
igb_register(device_t dev)
{
	return (&igb_sctx_init);
}

static void *
igbv_register(device_t dev)
{
	return (&igbv_sctx_init);
}

static int
igb_device_attach(device_t dev)
{
	struct e1000_softc *sc;
	if_ctx_t ctx;
	int error;

	error = iflib_device_attach(dev);
	if (error != 0)
		return (error);

	ctx = device_get_softc(dev);
	sc = iflib_get_softc(ctx);
	(void)igb_iov_attach(sc);
	return (0);
}

#ifdef PCI_IOV
static int
igb_device_iov_init(device_t dev, uint16_t num_vfs,
    const nvlist_t *params)
{
	struct e1000_softc *sc;
	if_ctx_t ctx;
	int error;

	ctx = device_get_softc(dev);
	sc = iflib_get_softc(ctx);
	error = igb_iov_validate(sc, num_vfs);
	if (error != 0)
		return (error);
	return (iflib_device_iov_init_restart(dev, num_vfs, params));
}

static void
igb_device_iov_uninit(device_t dev)
{
	struct e1000_softc *sc;
	if_ctx_t ctx;

	ctx = device_get_softc(dev);
	sc = iflib_get_softc(ctx);
	/*
	 * pci_iov(4) has already detached the VF devices.  Tell the stop
	 * half of iflib's restart transaction not to wait for acknowledgements
	 * from VFs which can no longer service their mailbox vectors.
	 */
	atomic_store_rel_32(&sc->iov_teardown, 1);
	iflib_device_iov_uninit_restart(dev);
}

#endif

static int
em_set_num_queues(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	int maxqueues;

	/* Sanity check based on HW */
	switch (sc->hw.mac.type) {
	case e1000_82576:
	case e1000_82580:
	case e1000_i350:
	case e1000_i354:
		maxqueues = 8;
		break;
	case e1000_i210:
	case e1000_82575:
		maxqueues = 4;
		break;
	case e1000_i211:
	case e1000_82574:
		maxqueues = 2;
		break;
	case e1000_vfadapt:
		/* Keep 82576 VFs at one RX/TX queue for mixed-driver safety. */
	case e1000_vfadapt_i350:
		maxqueues = 1;
		break;
	default:
		maxqueues = 1;
		break;
	}

	return (maxqueues);
}

#define LEM_CAPS ( \
    IFCAP_HWCSUM | IFCAP_VLAN_MTU | IFCAP_VLAN_HWTAGGING | \
    IFCAP_VLAN_HWCSUM | IFCAP_WOL | IFCAP_VLAN_HWFILTER | IFCAP_TSO4 | \
    IFCAP_LRO | IFCAP_VLAN_HWTSO | IFCAP_JUMBO_MTU | IFCAP_HWCSUM_IPV6)

#define EM_CAPS ( \
    IFCAP_HWCSUM | IFCAP_VLAN_MTU | IFCAP_VLAN_HWTAGGING | \
    IFCAP_VLAN_HWCSUM | IFCAP_WOL | IFCAP_VLAN_HWFILTER | IFCAP_TSO4 | \
    IFCAP_LRO | IFCAP_VLAN_HWTSO | IFCAP_JUMBO_MTU | IFCAP_HWCSUM_IPV6 | \
    IFCAP_TSO6)

#define IGB_CAPS ( \
    IFCAP_HWCSUM | IFCAP_VLAN_MTU | IFCAP_VLAN_HWTAGGING | \
    IFCAP_VLAN_HWCSUM | IFCAP_WOL | IFCAP_VLAN_HWFILTER | IFCAP_TSO4 | \
    IFCAP_LRO | IFCAP_VLAN_HWTSO | IFCAP_JUMBO_MTU | IFCAP_HWCSUM_IPV6 | \
    IFCAP_TSO6)

/*
 * VLAN filtering is an effective VF capability, but its policy is owned by
 * the PF and cannot be disabled from the VF.  vlan(4) registration callbacks
 * are independent of this capability bit.
 */
#define IGBV_CAPS	(IGB_CAPS & ~IFCAP_WOL)

void
em_add_device_sysctls(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	struct sysctl_oid_list *child;
	struct sysctl_ctx_list *ctx_list;

	hw = &sc->hw;
	ctx_list = device_get_sysctl_ctx(sc->dev);
	child = SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev));

	sc->enable_aim = em_enable_aim;
	SYSCTL_ADD_INT(ctx_list, child, OID_AUTO, "enable_aim",
	    CTLFLAG_RW, &sc->enable_aim, 0,
	    "Interrupt Moderation (1=normal, 2=lowlatency)");

	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "debug",
	    CTLTYPE_INT | CTLFLAG_RW, sc, 0,
	    em_sysctl_debug_info, "I", "Debug Information");

	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "rs_dump",
	    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0,
	    em_get_rs, "I", "Dump RS indexes");

	if (sc->vf_ifp) {
		SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "reg_dump",
		    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0,
		    igbv_get_regs, "A", "Dump VF registers");
		return;
	}

	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "nvm",
	    CTLTYPE_INT | CTLFLAG_RW, sc, 0,
	    em_sysctl_nvm_info, "I", "NVM Information");
	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "fw_version",
	    CTLTYPE_STRING | CTLFLAG_RD, sc, 0,
	    em_sysctl_print_fw_version, "A",
	    "Prints FW/NVM Versions");
	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "fc",
	    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0,
	    em_set_flowcntl, "I", "Flow Control");
	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "reg_dump",
	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, sc, 0,
	    em_get_regs, "A", "Dump Registers");

	if (hw->mac.type >= e1000_i350 && hw->mac.type != e1000_i211) {
		SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "dmac",
		    CTLTYPE_INT | CTLFLAG_RW, sc, 0,
		    igb_sysctl_dmac, "I", "DMA Coalesce");
	}

	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO,
	    "tso_tcp_flags_mask_first_segment",
	    CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
	    sc, 0, em_sysctl_tso_tcp_flags_mask, "IU",
	    "TSO TCP flags mask for first segment");
	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO,
	    "tso_tcp_flags_mask_middle_segment",
	    CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
	    sc, 1, em_sysctl_tso_tcp_flags_mask, "IU",
	    "TSO TCP flags mask for middle segment");
	SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO,
	    "tso_tcp_flags_mask_last_segment",
	    CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
	    sc, 2, em_sysctl_tso_tcp_flags_mask, "IU",
	    "TSO TCP flags mask for last segment");
}

/*********************************************************************
 *  Device initialization routine
 *
 *  The attach entry point is called when the driver is being loaded.
 *  This routine identifies the type of hardware, allocates all resources
 *  and initializes the hardware.
 *
 *  return 0 on success, positive on failure
 *********************************************************************/
int
em_if_attach_pre(if_ctx_t ctx)
{
	struct e1000_softc *sc;
	if_softc_ctx_t scctx;
	device_t dev;
	struct e1000_hw *hw;
	struct sysctl_oid_list *child;
	struct sysctl_ctx_list *ctx_list;
	int error = 0;

	INIT_DEBUGOUT("em_if_attach_pre: begin");
	dev = iflib_get_dev(ctx);
	sc = iflib_get_softc(ctx);

	if (em_max_interrupt_rate <= 0) {
		device_printf(dev,
		    "Invalid max_interrupt_rate %d; using default %d\n",
		    em_max_interrupt_rate, EM_INTS_DEFAULT);
		em_max_interrupt_rate = EM_INTS_DEFAULT;
	}

	sc->ctx = sc->osdep.ctx = ctx;
	sc->dev = sc->osdep.dev = dev;
	scctx = sc->shared = iflib_get_softc_ctx(ctx);
	sc->media = iflib_get_media(ctx);
	hw = &sc->hw;
	sc->vf_ifp =
	    (iflib_get_sctx(ctx)->isc_flags & IFLIB_IS_VF) != 0;
	sc->osdep.vf = sc->vf_ifp;

	/* Determine hardware and mac info */
	em_identify_hardware(ctx);
	sc->osdep.vf_82576 = sc->hw.mac.type == e1000_vfadapt;

	/* VF sysctls are deferred until attach-post confirms MSI-X. */
	ctx_list = device_get_sysctl_ctx(dev);
	child = SYSCTL_CHILDREN(device_get_sysctl_tree(dev));
	if (!sc->vf_ifp)
		em_add_device_sysctls(sc);

	scctx->isc_tx_nsegments = EM_MAX_SCATTER;
	scctx->isc_nrxqsets_max =
	    scctx->isc_ntxqsets_max = em_set_num_queues(ctx);
	if (bootverbose)
		device_printf(dev, "attach_pre capping queues at %d\n",
		    scctx->isc_ntxqsets_max);

	if (hw->mac.type >= igb_mac_min) {
		scctx->isc_txqsizes[0] = roundup2(scctx->isc_ntxd[0] *
		    sizeof(union e1000_adv_tx_desc), EM_DBA_ALIGN);
		scctx->isc_rxqsizes[0] = roundup2(scctx->isc_nrxd[0] *
		    sizeof(union e1000_adv_rx_desc), EM_DBA_ALIGN);
		scctx->isc_txd_size[0] = sizeof(union e1000_adv_tx_desc);
		scctx->isc_rxd_size[0] = sizeof(union e1000_adv_rx_desc);
		scctx->isc_txrx = &igb_txrx;
		scctx->isc_tx_tso_segments_max = EM_MAX_SCATTER;
		scctx->isc_tx_tso_size_max = EM_TSO_SIZE;
		scctx->isc_tx_tso_segsize_max = EM_TSO_SEG_SIZE;
		scctx->isc_capabilities = scctx->isc_capenable =
		    sc->vf_ifp ? IGBV_CAPS : IGB_CAPS;
		scctx->isc_tx_csum_flags = CSUM_TCP | CSUM_UDP | CSUM_TSO |
		     CSUM_IP6_TCP | CSUM_IP6_UDP;
		if (hw->mac.type != e1000_82575)
			scctx->isc_tx_csum_flags |= CSUM_SCTP | CSUM_IP6_SCTP;
		/*
		** Some new devices, as with ixgbe, now may
		** use a different BAR, so we need to keep
		** track of which is used.
		*/
		scctx->isc_msix_bar = pci_msix_table_bar(dev);
	} else if (hw->mac.type >= em_mac_min) {
		scctx->isc_txqsizes[0] = roundup2(scctx->isc_ntxd[0] *
		    sizeof(struct e1000_tx_desc), EM_DBA_ALIGN);
		scctx->isc_rxqsizes[0] = roundup2(scctx->isc_nrxd[0] *
		    sizeof(union e1000_rx_desc_extended), EM_DBA_ALIGN);
		scctx->isc_txd_size[0] = sizeof(struct e1000_tx_desc);
		scctx->isc_rxd_size[0] = sizeof(union e1000_rx_desc_extended);
		scctx->isc_txrx = &em_txrx;
		scctx->isc_tx_tso_segments_max = EM_MAX_SCATTER;
		scctx->isc_tx_tso_size_max = EM_TSO_SIZE;
		scctx->isc_tx_tso_segsize_max = EM_TSO_SEG_SIZE;
		scctx->isc_capabilities = scctx->isc_capenable = EM_CAPS;
		scctx->isc_tx_csum_flags = CSUM_TCP | CSUM_UDP | CSUM_IP_TSO |
		    CSUM_IP6_TCP | CSUM_IP6_UDP;

		/* Disable TSO on all em(4) until ring stalls are debugged */
		scctx->isc_capenable &= ~IFCAP_TSO;

		/*
		 * Disable TSO on SPT due to errata that downclocks DMA
		 * performance
		 * i218-i219 Specification Update 1.5.4.5
		 */
		if (hw->mac.type == e1000_pch_spt)
			scctx->isc_capenable &= ~IFCAP_TSO;

		/*
		 * We support MSI-X with 82574 only, but indicate to iflib(4)
		 * that it shall give MSI at least a try with other devices.
		 */
		if (hw->mac.type == e1000_82574) {
			scctx->isc_msix_bar = pci_msix_table_bar(dev);
		} else {
			scctx->isc_msix_bar = -1;
			scctx->isc_disable_msix = 1;
		}
	} else {
		scctx->isc_txqsizes[0] = roundup2((scctx->isc_ntxd[0] + 1) *
		    sizeof(struct e1000_tx_desc), EM_DBA_ALIGN);
		scctx->isc_rxqsizes[0] = roundup2((scctx->isc_nrxd[0] + 1) *
		    sizeof(struct e1000_rx_desc), EM_DBA_ALIGN);
		scctx->isc_txd_size[0] = sizeof(struct e1000_tx_desc);
		scctx->isc_rxd_size[0] = sizeof(struct e1000_rx_desc);
		scctx->isc_txrx = &lem_txrx;
		scctx->isc_tx_tso_segments_max = EM_MAX_SCATTER;
		scctx->isc_tx_tso_size_max = EM_TSO_SIZE;
		scctx->isc_tx_tso_segsize_max = EM_TSO_SEG_SIZE;
		scctx->isc_capabilities = scctx->isc_capenable = LEM_CAPS;
		if (em_unsupported_tso)
			scctx->isc_capabilities |= IFCAP_TSO6;
		scctx->isc_tx_csum_flags = CSUM_TCP | CSUM_UDP | CSUM_IP_TSO |
		    CSUM_IP6_TCP | CSUM_IP6_UDP;

		/* Disable TSO on all lem(4) until ring stalls debugged */
		scctx->isc_capenable &= ~IFCAP_TSO;

		/* 82541ER doesn't do HW tagging */
		if (hw->device_id == E1000_DEV_ID_82541ER ||
		    hw->device_id == E1000_DEV_ID_82541ER_LOM) {
			scctx->isc_capabilities &= ~IFCAP_VLAN_HWTAGGING;
			scctx->isc_capenable = scctx->isc_capabilities;
		}
		/* This is the first e1000 chip and it does not do offloads */
		if (hw->mac.type == e1000_82542) {
			scctx->isc_capabilities &= ~(IFCAP_HWCSUM |
			    IFCAP_VLAN_HWCSUM | IFCAP_HWCSUM_IPV6 |
			    IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWFILTER |
			    IFCAP_TSO | IFCAP_VLAN_HWTSO);
			scctx->isc_capenable = scctx->isc_capabilities;
		}
		/* These can't do TSO for various reasons */
		if (hw->mac.type < e1000_82544 ||
		    hw->mac.type == e1000_82547 ||
		    hw->mac.type == e1000_82547_rev_2) {
			scctx->isc_capabilities &=
			    ~(IFCAP_TSO |IFCAP_VLAN_HWTSO);
			scctx->isc_capenable = scctx->isc_capabilities;
		}
		/* XXXKB: No IPv6 before this? */
		if (hw->mac.type < e1000_82545){
			scctx->isc_capabilities &= ~IFCAP_HWCSUM_IPV6;
			scctx->isc_capenable = scctx->isc_capabilities;
		}
		/*
		 * "PCI/PCI-X SDM 4.0" page 33 (b):
		 * FDX requirement on these chips
		 */
		if (hw->mac.type == e1000_82547 ||
		    hw->mac.type == e1000_82547_rev_2)
			scctx->isc_capenable &= ~(IFCAP_HWCSUM |
			    IFCAP_VLAN_HWCSUM | IFCAP_HWCSUM_IPV6);

		/* INTx only */
		scctx->isc_msix_bar = 0;
	}

	/* Setup PCI resources */
	if (em_allocate_pci_resources(ctx)) {
		device_printf(dev, "Allocation of PCI resources failed\n");
		error = ENXIO;
		goto err_pci;
	}
	/*
	 * A VF can retain queue enable bits and DMA addresses across VFLR.
	 * Fence bus mastering before the first mailbox reset so state left by
	 * a previous owner cannot issue DMA while the driver attaches.
	 */
	if (sc->vf_ifp)
		em_fence_pci_busmaster(sc);
	/*
	 * 82579 can lose a host CSR write while the Management Engine owns
	 * the PCIm2PCI arbiter.  Enable the OS register write interlock before
	 * shared code initialization performs any MAC writes.
	 */
	if (hw->mac.type == e1000_pch2lan &&
	    (E1000_READ_REG(hw, E1000_FWSM) &
	    E1000_ICH_FWSM_FW_VALID) != 0)
		sc->osdep.pcim2pci_arbiter_wa = true;

	/*
	** For ICH8 and family we need to
	** map the flash memory, and this
	** must happen after the MAC is
	** identified
	*/
	if ((hw->mac.type == e1000_ich8lan) ||
	    (hw->mac.type == e1000_ich9lan) ||
	    (hw->mac.type == e1000_ich10lan) ||
	    (hw->mac.type == e1000_pchlan) ||
	    (hw->mac.type == e1000_pch2lan) ||
	    (hw->mac.type == e1000_pch_lpt)) {
		int rid = EM_BAR_TYPE_FLASH;
		sc->flash = bus_alloc_resource_any(dev,
		    SYS_RES_MEMORY, &rid, RF_ACTIVE);
		if (sc->flash == NULL) {
			device_printf(dev, "Mapping of Flash failed\n");
			error = ENXIO;
			goto err_pci;
		}
		/* This is used in the shared code */
		hw->flash_address = (u8 *)sc->flash;
		sc->osdep.flash_bus_space_tag =
		    rman_get_bustag(sc->flash);
		sc->osdep.flash_bus_space_handle =
		    rman_get_bushandle(sc->flash);
	}
	/*
	** In the new SPT device flash is not  a
	** separate BAR, rather it is also in BAR0,
	** so use the same tag and an offset handle for the
	** FLASH read/write macros in the shared code.
	*/
	else if (hw->mac.type >= e1000_pch_spt) {
		sc->osdep.flash_bus_space_tag = sc->osdep.mem_bus_space_tag;
		sc->osdep.flash_bus_space_handle =
		    sc->osdep.mem_bus_space_handle + E1000_FLASH_BASE_ADDR;
	}

	/* Do Shared Code initialization */
	error = e1000_setup_init_funcs(hw, true);
	if (error) {
		device_printf(dev, "Setup of Shared code failed, error %d\n",
		    error);
		error = ENXIO;
		goto err_pci;
	}

	em_setup_msix(ctx);
	e1000_get_bus_info(hw);

	/*
	 * Some conventional PCI systems hang when e1000 devices use
	 * DMA addresses above 4 GB.  Keep PCI-mode DMA below that boundary
	 * by default; PCI-X and PCIe retain 64-bit DMA.
	 */
	if (hw->bus.type == e1000_bus_type_pci) {
		SYSCTL_ADD_BOOL(ctx_list, child, OID_AUTO, "allow_64bit_dma",
		    CTLFLAG_RDTUN, &sc->allow_64bit_dma, 0,
		    "Allow 64-bit DMA in conventional PCI mode");
		if (sc->allow_64bit_dma)
			device_printf(dev, "64-bit DMA in conventional PCI mode.  "
			    "Some chipsets are unstable.\n");
		else {
			scctx->isc_dma_width = 32;
			device_printf(dev, "32-bit DMA in conventional PCI mode.  "
			    "Set dev.%s.%d.allow_64bit_dma=1 at boot to enable "
			    "64-bit DMA if the chipset is stable with it.\n",
			    device_get_name(dev), device_get_unit(dev));
		}
	}

	/* Set up some sysctls for the tunable interrupt delays */
	if (hw->mac.type < igb_mac_min) {
		em_add_int_delay_sysctl(sc, "rx_int_delay",
		    "receive interrupt delay in usecs", &sc->rx_int_delay,
		    E1000_REGISTER(hw, E1000_RDTR), em_rx_int_delay_dflt);
		em_add_int_delay_sysctl(sc, "tx_int_delay",
		    "transmit interrupt delay in usecs", &sc->tx_int_delay,
		    E1000_REGISTER(hw, E1000_TIDV), em_tx_int_delay_dflt);
	}
	if (hw->mac.type >= e1000_82540 && hw->mac.type < igb_mac_min) {
		em_add_int_delay_sysctl(sc, "rx_abs_int_delay",
		    "receive interrupt delay limit in usecs",
		    &sc->rx_abs_int_delay,
		    E1000_REGISTER(hw, E1000_RADV), em_rx_abs_int_delay_dflt);
		em_add_int_delay_sysctl(sc, "tx_abs_int_delay",
		    "transmit interrupt delay limit in usecs",
		    &sc->tx_abs_int_delay,
		    E1000_REGISTER(hw, E1000_TADV), em_tx_abs_int_delay_dflt);
	}

	hw->mac.autoneg = DO_AUTO_NEG;
	hw->phy.autoneg_wait_to_complete = false;
	hw->phy.autoneg_advertised = AUTONEG_ADV_DEFAULT;

	if (hw->mac.type < em_mac_min) {
		e1000_init_script_state_82541(hw, true);
		e1000_set_tbi_compatibility_82543(hw, true);
	}
	/* Copper options */
	if (hw->phy.media_type == e1000_media_type_copper) {
		hw->phy.mdix = AUTO_ALL_MODES;
		hw->phy.disable_polarity_correction = false;
		hw->phy.ms_type = EM_MASTER_SLAVE;
	}

	/*
	 * Set the frame limits assuming
	 * standard ethernet sized frames.
	 */
	scctx->isc_max_frame_size = hw->mac.max_frame_size =
	    ETHERMTU + ETHER_HDR_LEN + ETHERNET_FCS_SIZE;

	/*
	 * This controls when hardware reports transmit completion
	 * status.
	 */
	hw->mac.report_tx_early = 1;

	/* Allocate multicast array memory. */
	sc->mta = malloc(sizeof(u8) * ETHER_ADDR_LEN *
	    MAX_NUM_MULTICAST_ADDRESSES, M_DEVBUF, M_NOWAIT);
	if (sc->mta == NULL) {
		device_printf(dev,
		    "Can not allocate multicast setup array\n");
		error = ENOMEM;
		goto err_late;
	}

	/* Clear the IFCAP_TSO auto mask */
	sc->tso_automasked = 0;

	/* Check SOL/IDER usage on physical functions. */
	if (!sc->vf_ifp && e1000_check_reset_block(hw))
		device_printf(dev,
		    "PHY reset is blocked due to SOL/IDER session.\n");

	/* Sysctl for setting Energy Efficient Ethernet */
	if (!sc->vf_ifp) {
		if (hw->mac.type < igb_mac_min)
			hw->dev_spec.ich8lan.eee_disable = eee_setting;
		else
			hw->dev_spec._82575.eee_disable = eee_setting;
		SYSCTL_ADD_PROC(ctx_list, child, OID_AUTO, "eee_control",
		    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0,
		    em_sysctl_eee, "I", "Disable Energy Efficient Ethernet");
	}

	/*
	** Start from a known state, this is
	** important in reading the nvm and
	** mac from that.
	*/
	error = e1000_reset_hw(hw);
	if (sc->vf_ifp) {
		atomic_store_rel_32(&sc->vf_mbx_ready,
		    error == E1000_SUCCESS);
		if (error != E1000_SUCCESS)
			igbv_log_reset_failure(sc, error, true);
		sc->vf_queues_sanitized = igbv_sanitize_queues(sc);
	} else if (error != E1000_SUCCESS) {
		device_printf(dev, "Hardware reset failed: %d\n", error);
		error = EIO;
		goto err_late;
	}

	/* Make sure a PF has a good EEPROM before we read from it. */
	if (!sc->vf_ifp && e1000_validate_nvm_checksum(hw) < 0) {
		/*
		** Some PCI-E parts fail the first check due to
		** the link being in sleep state, call it again,
		** if it fails a second time its a real issue.
		*/
		if (e1000_validate_nvm_checksum(hw) < 0) {
			device_printf(dev,
			    "The EEPROM Checksum Is Not Valid\n");
			error = EIO;
			goto err_late;
		}
	}

	/* Copy the permanent MAC address out of the EEPROM */
	if (e1000_read_mac_addr(hw) < 0) {
		device_printf(dev,
		    "EEPROM read error while reading MAC address\n");
		error = EIO;
		goto err_late;
	}

	if (!em_is_valid_ether_addr(hw->mac.addr)) {
		if (sc->vf_ifp) {
			device_printf(dev,
			    "PF did not assign a MAC address; using a "
			    "locally generated address\n");
			ether_gen_addr(iflib_get_ifp(ctx),
			    (struct ether_addr *)hw->mac.addr);
		} else {
			device_printf(dev, "Invalid MAC address\n");
			error = EIO;
			goto err_late;
		}
	}

	if (!sc->vf_ifp) {
		/* Save NVM versions while holding the IFLIB context lock. */
		em_fw_version_locked(ctx);
		em_print_fw_version(sc);
	}

	/*
	 * Get Wake-on-Lan and Management info for later use
	 */
	if (!sc->vf_ifp) {
		em_get_wakeup(ctx);
	}

	iflib_set_mac(ctx, hw->mac.addr);

	return (0);

err_late:
	em_release_hw_control(sc);
err_pci:
	em_free_pci_resources(ctx);
	free(sc->mta, M_DEVBUF);
	sc->mta = NULL;

	return (error);
}

int
em_if_attach_post(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	int error = 0;

	/* Setup OS specific network interface */
	error = em_setup_interface(ctx);
	if (error != 0) {
		device_printf(sc->dev, "Interface setup failed: %d\n", error);
		goto err_late;
	}

	if (sc->vf_ifp) {
		(void)igbv_reset(ctx);
	} else if (em_reset(ctx) != E1000_SUCCESS) {
		error = EIO;
		goto err_late;
	}

	/* Initialize statistics */
	if (sc->vf_ifp)
		em_initialize_vf_stats(sc);
	else
		sc->ustats.stats = (struct e1000_hw_stats){};

	em_update_stats_counters(sc);
	atomic_readandclear_32(&sc->stats_pending);
	hw->mac.get_link_status = 1;
	if (sc->vf_ifp)
		igbv_if_update_admin_status(ctx);
	else
		em_if_update_admin_status(ctx);
	em_add_hw_stats(sc);

	/* Non-AMT based hardware can now take control from firmware */
	if (sc->has_manage && !sc->has_amt)
		em_get_hw_control(sc);

	INIT_DEBUGOUT("em_if_attach_post: end");

	return (0);

err_late:
	/*
	 * Upon em_if_attach_post() error, iflib calls em_if_detach() to
	 * free resources
	 */
	return (error);
}

/*********************************************************************
 *  Device removal routine
 *
 *  The detach entry point is called when the driver is being removed.
 *  This routine stops the adapter and deallocates all the resources
 *  that were allocated for driver operation.
 *
 *  return 0 on success, positive on failure
 *********************************************************************/
static int
em_if_detach(if_ctx_t ctx)
{
	struct e1000_softc	*sc = iflib_get_softc(ctx);

	INIT_DEBUGOUT("em_if_detach: begin");

	igb_iov_detach(sc);
	if (sc->vf_ifp) {
		igbv_queue_retry_detach(sc);
		igbv_mbx_retry_detach(sc);
	} else {
		e1000_phy_hw_reset(&sc->hw);
	}

	em_release_manageability(sc);
	em_release_hw_control(sc);
	em_free_pci_resources(ctx);
	free(sc->mta, M_DEVBUF);
	sc->mta = NULL;

	return (0);
}

/*********************************************************************
 *
 *  Shutdown entry point
 *
 **********************************************************************/

static int
em_if_shutdown(if_ctx_t ctx)
{
	int error;

	error = em_if_suspend(ctx);
	if (error != 0)
		device_printf(iflib_get_dev(ctx),
		    "Wake configuration failed during shutdown: %d\n", error);
	return (0);
}

/*
 * Suspend/resume device methods.
 */
static int
em_if_suspend(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	int error;

	if (sc->vf_ifp) {
		igbv_queue_retry_stop(sc);
		igbv_mbx_retry_stop(sc);
	}
	error = em_enable_wakeup(ctx);
	em_release_manageability(sc);
	em_release_hw_control(sc);
	return (error);
}

static int
em_if_resume(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	u32 wus;
	u16 phy_wus;
	int error;

	if (sc->hw.mac.type >= e1000_pch2lan &&
	    sc->hw.mac.type < igb_mac_min)
		e1000_resume_workarounds_pchlan(&sc->hw);

	if (sc->wol_phy_armed) {
		/*
		 * The PHY wake sequence requires an LCD reset before host wake
		 * ownership is cleared.  Wake registers survive this reset.
		 */
		(void)e1000_phy_hw_reset(&sc->hw);
		error = em_disable_phy_wakeup(sc, &phy_wus);
		if (error != E1000_SUCCESS)
			device_printf(sc->dev,
			    "Could not clear PHY wakeup state: %d\n", error);
		else if (phy_wus != 0)
			device_printf(sc->dev, "PHY wakeup status: %#06x\n",
			    phy_wus);
	}
	if (!sc->vf_ifp && sc->hw.mac.type >= e1000_82544) {
		wus = E1000_READ_REG(&sc->hw, E1000_WUS);
		if (!sc->wol_phy_wakeup && wus != 0)
			device_printf(sc->dev, "MAC wakeup status: %#010x\n",
			    wus);
		E1000_WRITE_REG(&sc->hw, E1000_WUFC, 0);
		E1000_WRITE_REG(&sc->hw, E1000_WUC, 0);
		E1000_WRITE_REG(&sc->hw, E1000_WUS, ~0U);
	}
	/* Clear PME after its MAC or PHY wake source has been removed. */
	pci_clear_pme(sc->dev);

	return (0);
}

static int
em_if_mtu_set(if_ctx_t ctx, uint32_t mtu)
{
	int max_frame_size;
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = iflib_get_softc_ctx(ctx);

	IOCTL_DEBUGOUT("ioctl rcv'd: SIOCSIFMTU (Set Interface MTU)");

	switch (sc->hw.mac.type) {
	case e1000_82571:
	case e1000_82572:
	case e1000_ich9lan:
	case e1000_ich10lan:
	case e1000_pch2lan:
	case e1000_pch_lpt:
	case e1000_pch_spt:
	case e1000_pch_cnp:
	case e1000_pch_tgp:
	case e1000_pch_adp:
	case e1000_pch_mtp:
	case e1000_pch_ptp:
	case e1000_pch_nvp:
	case e1000_82574:
	case e1000_82583:
	case e1000_80003es2lan:
		/* 9K Jumbo Frame size */
		max_frame_size = 9234;
		break;
	case e1000_pchlan:
		max_frame_size = 4096;
		break;
	case e1000_82542:
	case e1000_ich8lan:
		/* Adapters that do not support jumbo frames */
		max_frame_size = ETHER_MAX_LEN;
		break;
	default:
		if (sc->hw.mac.type >= igb_mac_min)
			max_frame_size = IGB_MAX_FRAME_SIZE;
		else /* lem */
			max_frame_size = MAX_JUMBO_FRAME_SIZE;
	}
	if (mtu > max_frame_size - ETHER_HDR_LEN - ETHER_CRC_LEN) {
		return (EINVAL);
	}

	scctx->isc_max_frame_size = sc->hw.mac.max_frame_size =
	    mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
	return (0);
}

/*********************************************************************
 *  Init entry point
 *
 *  This routine is used in two ways. It is used by the stack as
 *  init entry point in network interface structure. It is also used
 *  by the driver as a hw/sw initialization routine to get to a
 *  consistent state.
 *
 **********************************************************************/
static void
em_if_init(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = sc->shared;
	if_t ifp = iflib_get_ifp(ctx);
	struct em_tx_queue *tx_que;
	int i;

	INIT_DEBUGOUT("em_if_init: begin");
	if (sc->vf_ifp) {
		igbv_queue_retry_prepare(sc);
		igbv_mbx_retry_prepare(sc);
		sc->vf_reset_pending = true;
	}
	if (sc->suspend_link_powered_down)
		em_power_up_wakeup_link(sc);

	/* Get the latest mac address, User can use a LAA */
	bcopy(if_getlladdr(ifp), sc->hw.mac.addr, ETHER_ADDR_LEN);

	/*
	 * A VF restores its address only after its reset handshake establishes
	 * CTS.  The PF path programs RAR[0] directly here.
	 */
	if (!sc->vf_ifp)
		e1000_rar_set(&sc->hw, sc->hw.mac.addr, 0);

	/*
	 * With the 82571 adapter, RAR[0] may be overwritten
	 * when the other port is reset, we make a duplicate
	 * in RAR[14] for that eventuality, this assures
	 * the interface continues to function.
	 */
	if (sc->hw.mac.type == e1000_82571) {
		e1000_set_laa_state_82571(&sc->hw, true);
		e1000_rar_set(&sc->hw, sc->hw.mac.addr,
		    E1000_RAR_ENTRIES - 1);
	}

	/* Initialize the hardware */
	igb_iov_reset_prepare(sc);
	if (sc->vf_ifp) {
		(void)igbv_reset(ctx);
		em_rebase_vf_stats(sc);
	} else if (em_reset(ctx) != E1000_SUCCESS) {
		iflib_init_failed(ctx);
		return;
	}
	if (sc->vf_ifp && !sc->vf_queues_sanitized) {
		/*
		 * Do not program or enable rings while retained queue state
		 * might still contain a previous VF owner's DMA address.  A
		 * bounded callout retries initialization after iflib leaves the
		 * failed initialization stopped.
		 */
		em_fence_pci_busmaster(sc);
		igbv_queue_retry_failed(ctx);
		return;
	}
	if (sc->vf_ifp &&
	    atomic_load_acq_32(&sc->vf_mbx_ready) == 0) {
		igbv_mbx_retry_failed(ctx);
		return;
	}
	/*
	 * Keep a fail-closed device fenced until reset and VF queue
	 * sanitization have removed every stale DMA address.
	 */
	if (sc->vf_ifp && em_enable_pci_busmaster(sc) != 0) {
		device_printf(sc->dev,
		    "Unable to enable PCI bus mastering\n");
		iflib_init_failed(ctx);
		return;
	}
	if (sc->vf_ifp)
		igbv_reconcile_mac(sc, ifp);
	/* Re-arm a link-up transition deferred for this reset. */
	if (sc->link_state == EM_LINK_STATE_DOWN_RESET_PENDING ||
	    sc->link_state == EM_LINK_STATE_UP_RESET_PENDING)
		sc->link_state = EM_LINK_STATE_DOWN;
	if (sc->vf_ifp)
		igbv_if_update_admin_status(ctx);
	else
		em_if_update_admin_status(ctx);

	for (i = 0, tx_que = sc->tx_queues; i < sc->tx_num_queues;
	    i++, tx_que++) {
		struct tx_ring *txr = &tx_que->txr;

		txr->tx_rs_cidx = txr->tx_rs_pidx;

		/* Initialize the last processed descriptor to be the end of
		 * the ring, rather than the start, so that we avoid an
		 * off-by-one error when calculating how many descriptors are
		 * done in the credits_update function.
		 */
		txr->tx_cidx_processed = scctx->isc_ntxd[0] - 1;
	}

	/* The VF VLAN EtherType is fixed and has no VET register. */
	if (!sc->vf_ifp)
		E1000_WRITE_REG(&sc->hw, E1000_VET, ETHERTYPE_VLAN);

	/* Clear bad data from Rx FIFOs */
	if (sc->hw.mac.type >= igb_mac_min && !sc->vf_ifp)
		e1000_rx_fifo_flush_base(&sc->hw);

	/* Configure for OS presence */
	em_init_manageability(sc);

	/* Prepare transmit descriptors and buffers */
	if (sc->vf_ifp)
		igbv_initialize_transmit_unit(ctx);
	else
		em_initialize_transmit_unit(ctx);

	/*
	 * A failed VF reset has no CTS channel on which to restore mailbox
	 * state.  The reset detector schedules another complete init, which
	 * replays these interface-owned lists after the handshake succeeds.
	 */
	em_if_multi_set(ctx);

	sc->rx_mbuf_sz = iflib_get_rx_mbuf_sz(ctx);
	if (sc->vf_ifp)
		igbv_initialize_receive_unit(ctx);
	else
		em_initialize_receive_unit(ctx);

	/* Set up VLAN support and filter. */
	em_setup_vlan_hw_support(ctx);

	/* Don't lose promiscuous settings. */
	em_if_set_promisc_impl(ctx, if_getflags(ifp));
	atomic_readandclear_32(&sc->promisc_pending);

	/* Restore PF/VF pool configuration after the global reset. */
	igb_iov_initialize(sc);

	if (sc->hw.mac.ops.clear_hw_cntrs != NULL)
		sc->hw.mac.ops.clear_hw_cntrs(&sc->hw);

	/* MSI-X configuration for 82574 */
	if (sc->hw.mac.type == e1000_82574) {
		int tmp = E1000_READ_REG(&sc->hw, E1000_CTRL_EXT);

		tmp |= E1000_CTRL_EXT_PBA_CLR;
		E1000_WRITE_REG(&sc->hw, E1000_CTRL_EXT, tmp);
		/* Set the IVAR - interrupt vector routing. */
		E1000_WRITE_REG(&sc->hw, E1000_IVAR, sc->ivars);
	} else if (sc->intr_type == IFLIB_INTR_MSIX) {
		/* Set up queue routing */
		igb_configure_queues(sc);
	}
	if (sc->hw.mac.type >= igb_mac_min)
		igb_initialize_interrupt_rate(sc);

	/* AMT based hardware can now take control from firmware */
	if (sc->has_manage && sc->has_amt)
		em_get_hw_control(sc);

	/* Set Energy Efficient Ethernet */
	if (sc->hw.mac.type >= igb_mac_min &&
	    sc->hw.phy.media_type == e1000_media_type_copper) {
		if (sc->hw.mac.type == e1000_i354)
			e1000_set_eee_i354(&sc->hw, true, true);
		else
			e1000_set_eee_i350(&sc->hw, true, true);
	}
	em_configure_peind_memory_errors(sc);
	em_configure_82575_memory_errors(sc);
	em_configure_82580_memory_errors(sc);
	if (sc->vf_ifp) {
		sc->vf_reset_pending = false;
	} else {
		u32 icr;

		/*
		 * Drain stale causes only after register reconstruction is
		 * complete.  DRSTA and DEV_RST_SET together close the window in
		 * which another device reset can arrive while interrupts are
		 * masked.
		 */
		icr = E1000_READ_REG(&sc->hw, E1000_ICR);
		if (igb_finish_device_reset(sc, icr)) {
			iflib_init_failed(ctx);
			return;
		}
		E1000_WRITE_REG(&sc->hw, E1000_ICS, E1000_ICS_LSC);
	}
}

/*
 * RX publishes its byte and packet counters as one snapshot when iflib
 * returns descriptors to hardware.  This also covers watchdog-driven RX
 * processing, which can run while the interrupt vector is unmasked.
 */
static __inline void
em_aim_rx_delta(struct rx_ring *rxr, u32 *bytes, u32 *packets)
{
	uint64_t snapshot;
	u32 now_bytes, now_packets;

	snapshot = atomic_load_acq_64(&rxr->rx_aim_snapshot);
	now_bytes = snapshot >> 32;
	now_packets = (u32)snapshot;
	*bytes = now_bytes - rxr->rx_bytes_last;
	*packets = now_packets - rxr->rx_packets_last;
	rxr->rx_bytes_last = now_bytes;
	rxr->rx_packets_last = now_packets;
}

/*
 * TX publishes its byte and packet counters as one snapshot at the doorbell,
 * because encapsulation can overlap the interrupt filter.  The two halves
 * remain independent free running u32 counters, so their deltas are correct
 * across wrap.
 */
static __inline void
em_aim_tx_delta(struct tx_ring *txr, u32 *bytes, u32 *packets)
{
	uint64_t snapshot;
	u32 now_bytes, now_packets;

	snapshot = atomic_load_acq_64(&txr->tx_aim_snapshot);
	now_bytes = snapshot >> 32;
	now_packets = (u32)snapshot;
	*bytes = now_bytes - txr->tx_bytes_last;
	*packets = now_packets - txr->tx_packets_last;
	txr->tx_bytes_last = now_bytes;
	txr->tx_packets_last = now_packets;
}

/*********************************************************************
 *
 *  Do Adaptive Interrupt Moderation:
 *    - Calculate based on average size over the last interval
 *
 *  Returns interrupts per second rather than a register value, so that the
 *  caller's EM_INTS_TO_ITR()/IGB_INTS_TO_EITR() conversion applies, or zero
 *  if the interval carried no packet to measure.
 *
 *********************************************************************/
static u32
em_ring_itr(struct e1000_softc *sc, u32 rxbytes, u32 rxpackets, u32 txbytes,
    u32 txpackets)
{
	u32 newitr = 0;

	if (txbytes && txpackets)
		newitr = txbytes / txpackets;
	if (rxbytes && rxpackets)
		newitr = max(newitr, rxbytes / rxpackets);

	/*
	 * No packet was observed, so there is no size to work from.  Report no
	 * observation and let the caller keep the rate it already has.
	 */
	if (newitr == 0)
		return (0);

	newitr += 24; /* account for hardware frame, crc */
	/* set an upper boundary */
	newitr = min(newitr, 3000);
	/* Be nice to the mid range */
	if ((newitr > 300) && (newitr < 1200))
		newitr = (newitr / 3);
	else
		newitr = (newitr / 2);

	/* The value above was written straight to EITR; make it a rate */
	newitr = EM_AIM_DIVIDEND / newitr;

	/*
	 * Cap the rate: enable_aim=1 is the normal setting, enable_aim=2 opts
	 * into the low latency end.  The original was unbounded and would ask
	 * for ~95k ints/s on minimum sized frames.  There is deliberately no
	 * floor, so jumbo traffic settles near 2.7k ints/s.
	 */
	if (sc->enable_aim == 1)
		newitr = min(newitr, EM_INTS_20K);
	else
		newitr = min(newitr, EM_INTS_70K);

	return (newitr);
}

/*********************************************************************
 *
 *  Helper to calculate next (E)ITR value for AIM
 *
 *********************************************************************/
static void
em_newitr(struct e1000_softc *sc, struct em_rx_queue *que,
    struct rx_ring *rxr)
{
	struct e1000_hw *hw = &sc->hw;
	struct em_tx_queue *tx_que;
	u32 ringbytes, ringpackets, rxbytes, rxpackets, txbytes, txpackets;
	u32 newitr;
	int i;

	em_aim_rx_delta(rxr, &rxbytes, &rxpackets);

	/*
	 * A vector can service more than one TX ring when iflib is configured
	 * with unequal RX and TX queue counts.  Sample every ring routed to
	 * this vector rather than treating the vector as a TX queue index.
	 */
	txbytes = txpackets = 0;
	for (i = 0; i < sc->tx_num_queues; i++) {
		tx_que = &sc->tx_queues[i];
		if (tx_que->msix != que->msix)
			continue;
		em_aim_tx_delta(&tx_que->txr, &ringbytes, &ringpackets);
		txbytes += ringbytes;
		txpackets += ringpackets;
	}

	/* Idle, do nothing */
	if (txbytes == 0 && rxbytes == 0)
		return;

	if (sc->enable_aim == 0) {
		newitr = em_max_interrupt_rate;
	} else if (sc->link_speed < SPEED_1000) {
		/* Use half default (4K) ITR if sub-gig */
		newitr = EM_INTS_4K;
	} else if (!sc->vf_ifp &&
	    sc->shared->isc_max_frame_size * 2 > (sc->pba << 10)) {
		/* Want at least enough packet buffer for two frames to AIM */
		newitr = em_max_interrupt_rate;
	} else {
		newitr = em_ring_itr(sc, rxbytes, rxpackets, txbytes,
		    txpackets);
		/* No usable observation; leave the rate where it is */
		if (newitr == 0)
			return;
	}

	if (hw->mac.type >= igb_mac_min) {
		newitr = IGB_INTS_TO_EITR(newitr);

		if (hw->mac.type == e1000_82575)
			newitr |= newitr << 16;
		else
			newitr |= E1000_EITR_CNT_IGNR;

		if (newitr != que->itr_setting) {
			que->itr_setting = newitr;
			E1000_WRITE_REG(hw, E1000_EITR(que->msix),
			    que->itr_setting);
		}
	} else {
		newitr = EM_INTS_TO_ITR(newitr);

		if (newitr != que->itr_setting) {
			que->itr_setting = newitr;
			if (hw->mac.type == e1000_82574 &&
			    sc->intr_type == IFLIB_INTR_MSIX) {
				E1000_WRITE_REG(hw,
				    E1000_EITR_82574(que->msix),
				    que->itr_setting);
			} else {
				E1000_WRITE_REG(hw, E1000_ITR,
				    que->itr_setting);
			}
		}
	}
}

static bool
em_has_pch_ecc(const struct e1000_hw *hw)
{

	return (hw->mac.type >= e1000_pch_lpt &&
	    hw->mac.type < e1000_82575);
}

static bool
em_has_82571_ecc_stats(const struct e1000_hw *hw)
{

	return (hw->mac.type == e1000_82571);
}

static bool
em_has_82575_memory_errors(const struct e1000_hw *hw)
{

	return (hw->mac.type == e1000_82575);
}

static void
em_configure_82575_memory_errors(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 ctrl_ext;

	hw = &sc->hw;
	if (!em_has_82575_memory_errors(hw))
		return;

	/* Discard pre-driver status before enabling the hardware reaction. */
	(void)E1000_READ_REG(hw, E1000_PBECCSTS_82575);
	(void)E1000_READ_REG(hw, E1000_RDHESTS_82575);
	(void)E1000_READ_REG(hw, E1000_TDHESTS_82575);
	E1000_WRITE_REG(hw, E1000_PBECCSTS_82575,
	    E1000_ECC_82575_ENABLE);
	E1000_WRITE_REG(hw, E1000_RDHESTS_82575,
	    E1000_ECC_82575_ENABLE);
	E1000_WRITE_REG(hw, E1000_TDHESTS_82575,
	    E1000_ECC_82575_ENABLE);

	ctrl_ext = E1000_READ_REG(hw, E1000_CTRL_EXT);
	E1000_WRITE_REG(hw, E1000_CTRL_EXT,
	    ctrl_ext | E1000_CTRL_EXT_MEHE);
	E1000_WRITE_FLUSH(hw);
}

static bool
em_has_82576_memory_errors(const struct e1000_hw *hw)
{

	return (hw->mac.type == e1000_82576);
}

static bool
em_82576_has_ipsec(const struct e1000_hw *hw)
{

	return (hw->device_id != E1000_DEV_ID_82576_NS &&
	    hw->device_id != E1000_DEV_ID_82576_NS_SERDES);
}

static void
em_configure_82576_memory_errors(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 peindm, reactions;

	hw = &sc->hw;
	if (!em_has_82576_memory_errors(hw))
		return;

	reactions = E1000_PEIND_82576_NONFATAL_MASK |
	    E1000_PEIND_82576_FATAL_MASK |
	    E1000_PEINDM_82576_PARITY_ENABLE;
	if (!em_82576_has_ipsec(hw))
		reactions &= ~E1000_PEIND_82576_IPSEC_MASK;

	/* Discard indications left by firmware before enabling reactions. */
	(void)E1000_READ_REG(hw, E1000_PEIND);
	peindm = E1000_READ_REG(hw, E1000_PEINDM);
	E1000_WRITE_REG(hw, E1000_PEINDM, peindm | reactions);
	E1000_WRITE_FLUSH(hw);
}

static bool
em_has_82580_memory_errors(const struct e1000_hw *hw)
{

	return (hw->mac.type == e1000_82580);
}

static void
em_clear_82580_memory_error_status(struct e1000_hw *hw, u32 reg)
{
	u32 status;

	status = E1000_READ_REG(hw, reg);
	if (status != 0)
		E1000_WRITE_REG(hw, reg, status);
}

static void
em_configure_82580_memory_errors(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 reg;

	hw = &sc->hw;
	if (!em_has_82580_memory_errors(hw))
		return;

	/* Clear status left before the driver completed its memory tables. */
	(void)E1000_READ_REG(hw, E1000_PEIND);
	em_clear_82580_memory_error_status(hw, E1000_DTPARS_82580);
	em_clear_82580_memory_error_status(hw, E1000_DRPARS_82580);
	em_clear_82580_memory_error_status(hw, E1000_DDPARS_82580);
	em_clear_82580_memory_error_status(hw, E1000_PCIEERRSTS);
	(void)E1000_READ_REG(hw, E1000_LANPERRSTS);
	em_update_82580_ecc_stats(sc,
	    E1000_READ_REG(hw, E1000_RPBECCSTS),
	    E1000_READ_REG(hw, E1000_TPBECCSTS),
	    E1000_READ_REG(hw, E1000_PCIEECCSTS));
	E1000_WRITE_REG(hw, E1000_RPBECCSTS,
	    E1000_PBECCSTS_82580_ECC_ENABLE);
	E1000_WRITE_REG(hw, E1000_TPBECCSTS,
	    E1000_PBECCSTS_82580_ECC_ENABLE);

	reg = E1000_READ_REG(hw, E1000_DTPARC_82580);
	E1000_WRITE_REG(hw, E1000_DTPARC_82580,
	    reg | E1000_DTPARC_82580_ENABLE_MASK);
	reg = E1000_READ_REG(hw, E1000_DRPARC_82580);
	E1000_WRITE_REG(hw, E1000_DRPARC_82580,
	    reg | E1000_DRPARC_82580_ENABLE_MASK);
	reg = E1000_READ_REG(hw, E1000_DDPARC_82580);
	E1000_WRITE_REG(hw, E1000_DDPARC_82580,
	    reg | E1000_DDPARC_82580_ENABLE_MASK);
	reg = E1000_READ_REG(hw, E1000_PCIEERRCTL_82580);
	E1000_WRITE_REG(hw, E1000_PCIEERRCTL_82580,
	    reg | E1000_PCIEERRCTL_82580_ENABLE_MASK);
	reg = E1000_READ_REG(hw, E1000_PCIEECCCTL_82580);
	E1000_WRITE_REG(hw, E1000_PCIEECCCTL_82580,
	    reg | E1000_PCIEECCCTL_82580_ENABLE_MASK);
	reg = E1000_READ_REG(hw, E1000_LANPERRCTL_82580);
	reg |= E1000_LANPERRCTL_82580_HOST_MASK;
	/* The RSS memory is initialized only for a multiqueue layout. */
	if (sc->rx_num_queues <= 1)
		reg &= ~E1000_LANPERRCTL_82580_RSS_ENABLE;
	E1000_WRITE_REG(hw, E1000_LANPERRCTL_82580, reg);
	reg = E1000_READ_REG(hw, E1000_PEINDM);
	E1000_WRITE_REG(hw, E1000_PEINDM,
	    reg | E1000_PEIND_FATAL_MASK);
	E1000_WRITE_FLUSH(hw);
}

static bool
em_has_i210_memory_errors(const struct e1000_hw *hw)
{

	return (hw->mac.type == e1000_i210 ||
	    hw->mac.type == e1000_i211);
}

static bool
em_has_i350_i354_memory_errors(const struct e1000_hw *hw)
{

	return (hw->mac.type == e1000_i350 ||
	    hw->mac.type == e1000_i354);
}

static void
em_configure_peind_memory_errors(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 peindm;

	hw = &sc->hw;
	if (!em_has_i350_i354_memory_errors(hw) &&
	    !em_has_i210_memory_errors(hw))
		return;

	/* Discard indications left by firmware before enabling reactions. */
	(void)E1000_READ_REG(hw, E1000_PEIND);
	/* Do not depend on firmware preserving the datasheet defaults. */
	peindm = E1000_READ_REG(hw, E1000_PEINDM);
	E1000_WRITE_REG(hw, E1000_PEINDM,
	    peindm | E1000_PEIND_FATAL_MASK);
	E1000_WRITE_FLUSH(hw);
}

static bool
em_has_peind_memory_errors(const struct e1000_hw *hw)
{

	return (em_has_82580_memory_errors(hw) ||
	    em_has_i350_i354_memory_errors(hw) ||
	    em_has_i210_memory_errors(hw));
}

static u32
em_pcie_fatal_error_mask(const struct e1000_hw *hw)
{

	if (em_has_82580_memory_errors(hw))
		return (~0U);
	if (em_has_i350_i354_memory_errors(hw))
		return (E1000_PCIEERRSTS_I350_I354_FATAL_MASK);
	if (em_has_i210_memory_errors(hw))
		return (E1000_PCIEERRSTS_I210_FATAL_MASK);
	return (0);
}

static u32
em_memory_error_intr_mask(const struct e1000_hw *hw)
{

	if (em_has_82575_memory_errors(hw))
		return (E1000_IMS_82575_MEMORY_ERROR_MASK);
	if (em_has_82576_memory_errors(hw))
		return (E1000_IMS_FER | E1000_IMS_NFER);
	if (em_has_pch_ecc(hw) || em_has_peind_memory_errors(hw))
		return (E1000_IMS_FER);
	return (0);
}

static bool
em_has_memory_errors(const struct e1000_hw *hw)
{

	return (em_memory_error_intr_mask(hw) != 0);
}

static bool
em_has_memory_error_stats(const struct e1000_hw *hw)
{

	return (em_has_82571_ecc_stats(hw) || em_has_memory_errors(hw));
}

static u32
em_fatal_error_intr_mask(struct e1000_softc *sc)
{
	if (!em_has_memory_errors(&sc->hw))
		return (0);
	if (atomic_load_acq_32(&sc->fatal_error_state) !=
	    EM_FATAL_ERROR_NONE)
		return (0);
	return (em_memory_error_intr_mask(&sc->hw));
}

static void
em_update_82580_ecc_stats(struct e1000_softc *sc, u32 rpbeccsts,
    u32 tpbeccsts, u32 pcieeccsts)
{
	u32 status;

	sc->corrected_error_packet_buffer_count +=
	    (rpbeccsts & E1000_PBECCSTS_82580_CORR_CNT_MASK) +
	    (tpbeccsts & E1000_PBECCSTS_82580_CORR_CNT_MASK);
	status = pcieeccsts & E1000_PCIEECCSTS_82580_ERROR_MASK;
	sc->uncorrected_error_pcie_count += bitcount32(status);
	if (status != 0)
		E1000_WRITE_REG(&sc->hw, E1000_PCIEECCSTS, status);
}

static void
em_update_82575_ecc_stats(struct e1000_softc *sc, u32 pbeccsts,
    u32 rdhests, u32 tdhests)
{

	sc->corrected_error_packet_buffer_count +=
	    pbeccsts & E1000_ECC_82575_CORR_CNT_MASK;
	sc->uncorrected_error_packet_buffer_count +=
	    (pbeccsts & E1000_ECC_82575_UNCORR_CNT_MASK) >>
	    E1000_ECC_82575_UNCORR_CNT_SHIFT;
	sc->corrected_error_dma_count +=
	    (rdhests & E1000_ECC_82575_CORR_CNT_MASK) +
	    (tdhests & E1000_ECC_82575_CORR_CNT_MASK);
	sc->uncorrected_error_dma_count +=
	    ((rdhests & E1000_ECC_82575_UNCORR_CNT_MASK) >>
	    E1000_ECC_82575_UNCORR_CNT_SHIFT) +
	    ((tdhests & E1000_ECC_82575_UNCORR_CNT_MASK) >>
	    E1000_ECC_82575_UNCORR_CNT_SHIFT);
}

static void
em_update_82576_ecc_counter(struct e1000_softc *sc, u32 reg,
    u64 *corrected, u64 *uncorrected)
{
	u32 status;

	status = E1000_READ_REG(&sc->hw, reg);
	*corrected += status & E1000_ECC_82576_CORR_CNT_MASK;
	if (uncorrected != NULL)
		*uncorrected +=
		    (status & E1000_ECC_82576_UNCORR_CNT_MASK) >>
		    E1000_ECC_82576_UNCORR_CNT_SHIFT;
}

static void
em_update_82576_ecc_stats(struct e1000_softc *sc)
{

	/*
	 * These counters are clear-on-read.  PRBESTS and PMSIXESTS are
	 * controller-shared, so whichever LAN port samples them first owns
	 * the software count.
	 */
	em_update_82576_ecc_counter(sc, E1000_RPBECCSTS,
	    &sc->corrected_error_packet_buffer_count,
	    &sc->uncorrected_error_packet_buffer_count);
	em_update_82576_ecc_counter(sc, E1000_TPBECCSTS,
	    &sc->corrected_error_packet_buffer_count,
	    &sc->uncorrected_error_packet_buffer_count);
	em_update_82576_ecc_counter(sc, E1000_SWPBECCSTS_82576,
	    &sc->corrected_error_packet_buffer_count,
	    &sc->uncorrected_error_packet_buffer_count);
	if (em_82576_has_ipsec(&sc->hw))
		em_update_82576_ecc_counter(sc, E1000_IPPBECCSTS_82576,
		    &sc->corrected_error_packet_buffer_count,
		    &sc->uncorrected_error_packet_buffer_count);

	em_update_82576_ecc_counter(sc, E1000_RDHESTS_82576,
	    &sc->corrected_error_dma_count,
	    &sc->uncorrected_error_dma_count);
	em_update_82576_ecc_counter(sc, E1000_TDHESTS_82576,
	    &sc->corrected_error_dma_count,
	    &sc->uncorrected_error_dma_count);

	em_update_82576_ecc_counter(sc, E1000_PRBESTS_82576,
	    &sc->corrected_error_pcie_retry_count, NULL);
	em_update_82576_ecc_counter(sc, E1000_PWBESTS_82576,
	    &sc->corrected_error_pcie_tx_data_count, NULL);
	em_update_82576_ecc_counter(sc, E1000_PMSIXESTS_82576,
	    &sc->corrected_error_pcie_other_count, NULL);
}

static void
em_update_pch_ecc_stats(struct e1000_softc *sc, u32 pbeccsts)
{

	sc->corrected_error_packet_buffer_count +=
	    pbeccsts & E1000_PBECCSTS_CORR_ERR_CNT_MASK;
	sc->uncorrected_error_packet_buffer_count +=
	    (pbeccsts & E1000_PBECCSTS_UNCORR_ERR_CNT_MASK) >>
	    E1000_PBECCSTS_UNCORR_ERR_CNT_SHIFT;
}

static void
em_update_82571_ecc_stats(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 count, pba_ecc;

	hw = &sc->hw;
	pba_ecc = E1000_READ_REG(hw, E1000_PBA_ECC);
	count = (pba_ecc & E1000_PBA_ECC_COUNTER_MASK) >>
	    E1000_PBA_ECC_COUNTER_SHIFT;
	if (count == 0)
		return;
	sc->corrected_error_packet_buffer_count += count;
	/* Preserve correction and reserved state while clearing statistics. */
	E1000_WRITE_REG(hw, E1000_PBA_ECC,
	    pba_ecc | E1000_PBA_ECC_STAT_CLR);
}

static void
em_update_i210_ecc_stats(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 pbeccsts, pcieeccsts;

	hw = &sc->hw;
	pbeccsts = E1000_READ_REG(hw, E1000_PBECCSTS_I210);
	if (pbeccsts & E1000_PBECCSTS_I210_CORR_ERR) {
		sc->corrected_error_dma_count++;
		/* Preserve the enable bit while clearing the RW1C status. */
		E1000_WRITE_REG(hw, E1000_PBECCSTS_I210,
		    pbeccsts & (E1000_PBECCSTS_I210_ECC_ENABLE |
		    E1000_PBECCSTS_I210_CORR_ERR));
	}

	pcieeccsts = E1000_READ_REG(hw, E1000_PCIEECCSTS) &
	    E1000_PCIEECCSTS_I210_CORR_MASK;
	if (pcieeccsts & E1000_PCIEECCSTS_TX_WR_DATA)
		sc->corrected_error_pcie_tx_data_count++;
	if (pcieeccsts & E1000_PCIEECCSTS_RETRY_BUF)
		sc->corrected_error_pcie_retry_count++;
	if (pcieeccsts != 0)
		E1000_WRITE_REG(hw, E1000_PCIEECCSTS, pcieeccsts);
}

static void
em_update_i350_i354_ecc_stats(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 pbeccsts, pcieecc_mask, status;

	hw = &sc->hw;
	status = E1000_READ_REG(hw, E1000_DTPARS) &
	    E1000_DTPARS_CORR_MASK;
	if (status != 0) {
		sc->corrected_error_dma_count += bitcount32(status);
		E1000_WRITE_REG(hw, E1000_DTPARS, status);
	}
	status = E1000_READ_REG(hw, E1000_DRPARS) &
	    E1000_DRPARS_CORR_MASK;
	if (status != 0) {
		sc->corrected_error_dma_count += bitcount32(status);
		E1000_WRITE_REG(hw, E1000_DRPARS, status);
	}
	status = E1000_READ_REG(hw, E1000_DDECCS) &
	    E1000_DDECCS_CORR_MASK;
	if (status != 0) {
		sc->corrected_error_dma_count += bitcount32(status);
		E1000_WRITE_REG(hw, E1000_DDECCS, status);
	}
	status = E1000_READ_REG(hw, E1000_LANPERRSTS) &
	    E1000_LANPERRSTS_MNG_FIFO_CORR;
	if (status != 0) {
		sc->corrected_error_lan_mng_fifo_count++;
		E1000_WRITE_REG(hw, E1000_LANPERRSTS, status);
	}

	pbeccsts = E1000_READ_REG(hw, E1000_RPBECCSTS);
	status = pbeccsts & E1000_PBECCSTS_I350_I354_CORR_MASK;
	if (status != 0) {
		sc->corrected_error_packet_buffer_count += bitcount32(status);
		/* Preserve the enable bits while clearing RW1C status. */
		E1000_WRITE_REG(hw, E1000_RPBECCSTS,
		    pbeccsts & (E1000_PBECCSTS_I350_I354_ENABLE_MASK |
		    E1000_PBECCSTS_I350_I354_CORR_MASK));
	}
	pbeccsts = E1000_READ_REG(hw, E1000_TPBECCSTS);
	status = pbeccsts & E1000_PBECCSTS_I350_I354_CORR_MASK;
	if (status != 0) {
		sc->corrected_error_packet_buffer_count += bitcount32(status);
		E1000_WRITE_REG(hw, E1000_TPBECCSTS,
		    pbeccsts & (E1000_PBECCSTS_I350_I354_ENABLE_MASK |
		    E1000_PBECCSTS_I350_I354_CORR_MASK));
	}

	pcieecc_mask = hw->mac.type == e1000_i354 ?
	    E1000_PCIEECCSTS_I354_CORR_MASK :
	    E1000_PCIEECCSTS_I350_CORR_MASK;
	status = E1000_READ_REG(hw, E1000_PCIEECCSTS) & pcieecc_mask;
	if (status & E1000_PCIEECCSTS_TX_WR_DATA)
		sc->corrected_error_pcie_tx_data_count++;
	if (status & E1000_PCIEECCSTS_RETRY_BUF)
		sc->corrected_error_pcie_retry_count++;
	sc->corrected_error_pcie_other_count += bitcount32(status &
	    E1000_PCIEECCSTS_I350_I354_OTHER_MASK);
	if (status != 0)
		E1000_WRITE_REG(hw, E1000_PCIEECCSTS, status);
}

/*
 * Internal-memory error causes are read-clear.  Capture them before handing
 * fatal recovery or non-fatal acknowledgement to the iflib admin task.
 */
static void
em_handle_fatal_error_intr(struct e1000_softc *sc, u32 icr)
{
	struct e1000_hw *hw;
	u32 dma_host, dma_rx, dma_tx, error_mask, lanerr, pcieerr, peind;

	error_mask = em_memory_error_intr_mask(&sc->hw);
	if (!em_has_memory_errors(&sc->hw) ||
	    (icr & error_mask) == 0)
		return;

	hw = &sc->hw;
	E1000_WRITE_REG(hw, E1000_IMC, error_mask);
	if (!atomic_cmpset_32(&sc->fatal_error_state,
	    EM_FATAL_ERROR_NONE, EM_FATAL_ERROR_CAPTURING))
		return;

	sc->fatal_error_icr = icr & error_mask;
	if (em_has_pch_ecc(hw)) {
		sc->fatal_error_pbeccsts =
		    E1000_READ_REG(hw, E1000_PBECCSTS);
	} else if (em_has_82575_memory_errors(hw)) {
		sc->fatal_error_pbeccsts =
		    E1000_READ_REG(hw, E1000_PBECCSTS_82575);
		sc->fatal_error_dma_rx =
		    E1000_READ_REG(hw, E1000_RDHESTS_82575);
		sc->fatal_error_dma_tx =
		    E1000_READ_REG(hw, E1000_TDHESTS_82575);
	} else if (em_has_82576_memory_errors(hw)) {
		sc->fatal_error_peind = E1000_READ_REG(hw, E1000_PEIND);
	} else {
		peind = E1000_READ_REG(hw, E1000_PEIND) &
		    E1000_PEIND_FATAL_MASK;
		pcieerr = E1000_READ_REG(hw, E1000_PCIEERRSTS) &
		    em_pcie_fatal_error_mask(hw);
		dma_host = 0;
		if (em_has_82580_memory_errors(hw)) {
			/*
			 * PEIND is visible through every function.  Retain the
			 * management indication, which has no subordinate status,
			 * but attribute host-owned regions from this function's
			 * status registers.
			 */
			peind &= E1000_PEIND_MNG_PARITY_FATAL;
			dma_tx = E1000_READ_REG(hw, E1000_DTPARS_82580);
			dma_rx = E1000_READ_REG(hw, E1000_DRPARS_82580);
			dma_host = E1000_READ_REG(hw,
			    E1000_DDPARS_82580);
			lanerr = E1000_READ_REG(hw, E1000_LANPERRSTS) &
			    E1000_LANPERRSTS_82580_ERROR_MASK;
		} else if (em_has_i350_i354_memory_errors(hw)) {
			dma_tx = E1000_READ_REG(hw, E1000_DTPARS) &
			    E1000_DTPARS_FATAL_MASK;
			dma_rx = E1000_READ_REG(hw, E1000_DRPARS) &
			    E1000_DRPARS_FATAL_MASK;
			lanerr = E1000_READ_REG(hw, E1000_LANPERRSTS) &
			    E1000_LANPERRSTS_I350_I354_FATAL_MASK;
		} else {
			dma_tx = 0;
			dma_rx = 0;
			lanerr = E1000_READ_REG(hw, E1000_LANPERRSTS) &
			    E1000_LANPERRSTS_RETX_BUF;
		}
		if (pcieerr != 0)
			peind |= E1000_PEIND_PCIE_PARITY_FATAL;
		if (lanerr != 0)
			peind |= E1000_PEIND_LANPORT_PARITY_FATAL;
		if (dma_tx != 0 || dma_rx != 0 || dma_host != 0)
			peind |= E1000_PEIND_DMA_PARITY_FATAL;
		sc->fatal_error_peind = peind;
		sc->fatal_error_pcie = pcieerr;
		sc->fatal_error_lan = lanerr;
		sc->fatal_error_dma_tx = dma_tx;
		sc->fatal_error_dma_rx = dma_rx;
		sc->fatal_error_dma_host = dma_host;
	}
	atomic_store_rel_32(&sc->fatal_error_state,
	    EM_FATAL_ERROR_DETECTED);
	iflib_admin_intr_deferred(sc->ctx);
}

static bool
em_handle_fatal_error_admin(struct e1000_softc *sc)
{
	u32 error_mask, pcieecc, peind;
	bool reset_required;

	if (!atomic_cmpset_acq_32(&sc->fatal_error_state,
	    EM_FATAL_ERROR_DETECTED, EM_FATAL_ERROR_RESET_REQUESTED))
		return (atomic_load_acq_32(&sc->fatal_error_state) !=
		    EM_FATAL_ERROR_NONE);

	if (em_has_pch_ecc(&sc->hw)) {
		em_update_pch_ecc_stats(sc, sc->fatal_error_pbeccsts);
		device_printf(sc->dev,
		    "uncorrectable packet-buffer ECC error: "
		    "PBECCSTS %#x; requesting reset\n",
		    sc->fatal_error_pbeccsts);
	} else if (em_has_82575_memory_errors(&sc->hw)) {
		em_update_82575_ecc_stats(sc, sc->fatal_error_pbeccsts,
		    sc->fatal_error_dma_rx, sc->fatal_error_dma_tx);
		device_printf(sc->dev,
		    "unrecoverable internal memory ECC error: ICR %#x, "
		    "PBECCSTS %#x, RDHESTS %#x, TDHESTS %#x; "
		    "requesting reset\n", sc->fatal_error_icr,
		    sc->fatal_error_pbeccsts, sc->fatal_error_dma_rx,
		    sc->fatal_error_dma_tx);
	} else if (em_has_82576_memory_errors(&sc->hw)) {
		peind = sc->fatal_error_peind;
		em_update_82576_ecc_stats(sc);
		reset_required =
		    (sc->fatal_error_icr & E1000_ICR_FER) != 0 ||
		    (peind & (E1000_PEIND_82576_FATAL_MASK |
		    E1000_PEIND_82576_MEMORY_HANG)) != 0;
		if (!reset_required) {
			device_printf(sc->dev,
			    "non-fatal internal memory error: PEIND %#x\n",
			    peind);
			sc->fatal_error_icr = 0;
			sc->fatal_error_peind = 0;
			atomic_store_rel_32(&sc->fatal_error_state,
			    EM_FATAL_ERROR_NONE);
			error_mask = E1000_IMS_FER | E1000_IMS_NFER;
			E1000_WRITE_REG(&sc->hw, E1000_IMS, error_mask);
			E1000_WRITE_FLUSH(&sc->hw);
			return (true);
		}
		if ((peind & (E1000_PEIND_82576_FATAL_MASK |
		    E1000_PEIND_82576_MEMORY_HANG)) == 0)
			sc->fatal_error_unknown_count++;
		device_printf(sc->dev,
		    "fatal internal memory error: PEIND %#x; "
		    "requesting reset\n", peind);
	} else {
		peind = sc->fatal_error_peind;
		if (em_has_82580_memory_errors(&sc->hw)) {
			pcieecc = E1000_READ_REG(&sc->hw,
			    E1000_PCIEECCSTS) &
			    E1000_PCIEECCSTS_82580_ERROR_MASK;
			sc->fatal_error_pcie_ecc |= pcieecc;
			if (pcieecc != 0) {
				peind |= E1000_PEIND_PCIE_PARITY_FATAL;
				sc->fatal_error_peind = peind;
			}
			em_update_82580_ecc_stats(sc,
			    E1000_READ_REG(&sc->hw, E1000_RPBECCSTS),
			    E1000_READ_REG(&sc->hw, E1000_TPBECCSTS),
			    pcieecc);
		} else if (em_has_i350_i354_memory_errors(&sc->hw))
			em_update_i350_i354_ecc_stats(sc);
		if (peind & E1000_PEIND_LANPORT_PARITY_FATAL)
			sc->fatal_error_lan_count++;
		if (peind & E1000_PEIND_MNG_PARITY_FATAL)
			sc->fatal_error_mng_count++;
		if (peind & E1000_PEIND_PCIE_PARITY_FATAL)
			sc->fatal_error_pcie_count++;
		if (peind & E1000_PEIND_DMA_PARITY_FATAL)
			sc->fatal_error_dma_count++;
		if (peind == 0)
			sc->fatal_error_unknown_count++;
		if (em_has_82580_memory_errors(&sc->hw)) {
			device_printf(sc->dev,
			    "fatal internal memory error: PEIND %#x, "
			    "PCIEERRSTS %#x, PCIEECCSTS %#x, "
			    "DTPARS %#x, DRPARS %#x, DDPARS %#x, "
			    "LANPERRSTS %#x\n", peind,
			    sc->fatal_error_pcie,
			    sc->fatal_error_pcie_ecc,
			    sc->fatal_error_dma_tx,
			    sc->fatal_error_dma_rx,
			    sc->fatal_error_dma_host,
			    sc->fatal_error_lan);
		} else {
			device_printf(sc->dev,
			    "fatal internal memory error: PEIND %#x, "
			    "PCIEERRSTS %#x, DTPARS %#x, DRPARS %#x, "
			    "LANPERRSTS %#x\n", peind,
			    sc->fatal_error_pcie,
			    sc->fatal_error_dma_tx,
			    sc->fatal_error_dma_rx,
			    sc->fatal_error_lan);
		}

		reset_required = (peind &
		    (E1000_PEIND_PCIE_PARITY_FATAL |
		    E1000_PEIND_DMA_PARITY_FATAL)) != 0;
		if (peind == 0)
			reset_required = true;
		if (peind & E1000_PEIND_LANPORT_PARITY_FATAL) {
			if (!em_has_i350_i354_memory_errors(&sc->hw) ||
			    sc->fatal_error_lan == 0 ||
			    (sc->fatal_error_lan &
			    E1000_LANPERRSTS_I350_I354_RESET_MASK) != 0)
				reset_required = true;
		}
		/* Management-memory recovery belongs to management firmware. */
		if (!reset_required) {
			if (em_has_i350_i354_memory_errors(&sc->hw) &&
			    sc->fatal_error_lan != 0)
				E1000_WRITE_REG(&sc->hw, E1000_LANPERRSTS,
				    sc->fatal_error_lan &
				    E1000_LANPERRSTS_I350_I354_NO_RESET_MASK);
			sc->fatal_error_peind = 0;
			sc->fatal_error_pcie = 0;
			sc->fatal_error_pcie_ecc = 0;
			sc->fatal_error_lan = 0;
			sc->fatal_error_dma_tx = 0;
			sc->fatal_error_dma_rx = 0;
			sc->fatal_error_dma_host = 0;
			atomic_store_rel_32(&sc->fatal_error_state,
			    EM_FATAL_ERROR_NONE);
			E1000_WRITE_REG(&sc->hw, E1000_IMS,
			    E1000_IMS_FER);
			E1000_WRITE_FLUSH(&sc->hw);
			return (true);
		}
		device_printf(sc->dev,
		    "requesting reset after memory error\n");
	}
	sc->fatal_error_reset_count++;
	iflib_request_reset(sc->ctx);
	/* Re-enter the admin task so it observes the reset request. */
	iflib_admin_intr_deferred(sc->ctx);
	return (true);
}

/*
 * ICR bit 30 is reserved on 82575 and is the TCP timer on 82576.  It becomes
 * the Device Reset Asserted interrupt starting with 82580.
 */
static u32
igb_device_reset_intr_mask(struct e1000_softc *sc)
{

	return (sc->hw.mac.type >= e1000_82580 ? E1000_IMS_DRSTA : 0);
}

/* Keep interrupt-side work quiesced until device-reset recovery completes. */
static bool
igb_device_reset_pending(struct e1000_softc *sc)
{

	return (!sc->vf_ifp && igb_device_reset_intr_mask(sc) != 0 &&
	    atomic_load_acq_32(&sc->device_reset_state) !=
	    IGB_DEVICE_RESET_NONE);
}

/*
 * CTRL.DEV_RST resets every port in the device.  ICR.DRSTA tells the other
 * ports that their registers and descriptor rings must be reinitialized.
 */
static bool
igb_handle_device_reset(struct e1000_softc *sc, u32 icr)
{
	u32 state;

	if (sc->vf_ifp || igb_device_reset_intr_mask(sc) == 0 ||
	    (icr & E1000_ICR_DRSTA) == 0)
		return (false);
	state = atomic_swap_32(&sc->device_reset_state,
	    IGB_DEVICE_RESET_DETECTED);
	if (state == IGB_DEVICE_RESET_DETECTED)
		return (true);

	iflib_admin_intr_deferred(sc->ctx);
	return (true);
}

/*
 * A device reset can leave a sibling port accessible before its internal
 * reset and PCIe transactions have completed.  For 82580 and newer parts,
 * wait for that device-wide reset to finish and acknowledge it before any
 * ordinary port register programming.  I350 and newer parts also publish
 * explicit EEPROM autoload and PF-reset completion indications.
 *
 * The wait is bounded because the only useful fallback for a controller
 * that never completes the device reset is the port reset already requested
 * by the interrupt handler.
 */
static void
igb_prepare_device_reset(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 state;
	u32 eecd, gcr, status;
	int i;

	hw = &sc->hw;
	state = atomic_load_acq_32(&sc->device_reset_state);
	if (state != IGB_DEVICE_RESET_DETECTED &&
	    state != IGB_DEVICE_RESET_REQUESTED &&
	    hw->mac.type >= e1000_82580) {
		/*
		 * A reset can start while this interface has interrupts disabled.
		 * GCR is the documented gate before ordinary port accesses.  STATUS
		 * also detects a reset that completed while this interface was down
		 * or after an earlier preparation pass.
		 */
		gcr = E1000_READ_REG(hw, E1000_GCR);
		if (gcr != 0xffffffff &&
		    (gcr & E1000_GCR_DEV_RST_IN_PROGRESS) != 0) {
			atomic_store_rel_32(&sc->device_reset_state,
			    IGB_DEVICE_RESET_DETECTED);
			state = IGB_DEVICE_RESET_DETECTED;
		} else if (gcr != 0xffffffff) {
			status = E1000_READ_REG(hw, E1000_STATUS);
			if (status != 0xffffffff &&
			    (status & E1000_STAT_DEV_RST_SET) != 0) {
				atomic_store_rel_32(&sc->device_reset_state,
				    IGB_DEVICE_RESET_DETECTED);
				state = IGB_DEVICE_RESET_DETECTED;
			}
		}
	}
	if (state != IGB_DEVICE_RESET_DETECTED &&
	    state != IGB_DEVICE_RESET_REQUESTED)
		return;

	if (hw->mac.type >= e1000_82580) {
		for (i = 0; i < IGB_DEVICE_RESET_TIMEOUT_MS; i++) {
			gcr = E1000_READ_REG(hw, E1000_GCR);
			if (gcr != 0xffffffff &&
			    (gcr & E1000_GCR_DEV_RST_IN_PROGRESS) == 0)
				break;
			msec_delay(1);
		}
		if (i == IGB_DEVICE_RESET_TIMEOUT_MS) {
			device_printf(sc->dev,
			    "device-wide reset did not complete; "
			    "attempting port reset\n");
			goto prepared;
		}

		/* STATUS.DEV_RST_SET is write-one-to-clear. */
		E1000_WRITE_REG(hw, E1000_STATUS, E1000_STAT_DEV_RST_SET);

		if (hw->mac.type >= e1000_i350) {
			for (i = 0; i < IGB_DEVICE_RESET_TIMEOUT_MS; i++) {
				eecd = E1000_READ_REG(hw, E1000_EECD);
				status = E1000_READ_REG(hw, E1000_STATUS);
				if (eecd != 0xffffffff && status != 0xffffffff &&
				    (eecd & E1000_EECD_AUTO_RD) != 0 &&
				    (status & E1000_STATUS_RST_DONE) != 0)
					break;
				msec_delay(1);
			}
			if (i == IGB_DEVICE_RESET_TIMEOUT_MS)
				device_printf(sc->dev,
				    "device-wide reset did not finish EEPROM "
				    "autoload or port reset; attempting port "
				    "reset\n");
		}
	}

prepared:
	atomic_store_rel_32(&sc->device_reset_state,
	    IGB_DEVICE_RESET_PREPARED);
}

/*
 * A second device reset can arrive while the port is being initialized.
 * Leave its status latched for the next preparation pass and do not let
 * iflib publish this incomplete initialization as a running datapath.
 */
static bool
igb_finish_device_reset(struct e1000_softc *sc, u32 icr)
{
	bool reset_again;
	u32 gcr, state, status;

	if (igb_device_reset_intr_mask(sc) == 0)
		return (false);

	state = atomic_load_acq_32(&sc->device_reset_state);
	reset_again = icr != 0xffffffff &&
	    (icr & E1000_ICR_DRSTA) != 0;
	if (sc->hw.mac.type >= e1000_82580) {
		gcr = E1000_READ_REG(&sc->hw, E1000_GCR);
		if (gcr != 0xffffffff &&
		    (gcr & E1000_GCR_DEV_RST_IN_PROGRESS) != 0)
			reset_again = true;
		status = E1000_READ_REG(&sc->hw, E1000_STATUS);
		if (status == 0xffffffff &&
		    state != IGB_DEVICE_RESET_NONE) {
			/*
			 * MMIO can disappear briefly while SR-IOV is changing, but
			 * config space remains readable.  If both are gone, retain the
			 * stopped state without queueing an endless reset loop.
			 */
			if (pci_read_config(sc->dev, PCIR_VENDOR, 2) == 0xffff) {
				atomic_store_rel_32(&sc->device_reset_state,
				    IGB_DEVICE_RESET_DETECTED);
				device_printf(sc->dev,
				    "device unavailable after device-wide reset; "
				    "leaving interface stopped\n");
				return (true);
			}
			reset_again = true;
		} else if (status != 0xffffffff &&
		    (status & E1000_STAT_DEV_RST_SET) != 0)
			reset_again = true;
	}
	if (state == IGB_DEVICE_RESET_DETECTED ||
	    state == IGB_DEVICE_RESET_REQUESTED)
		reset_again = true;
	if (!reset_again) {
		if (state == IGB_DEVICE_RESET_PREPARED &&
		    !atomic_cmpset_rel_32(&sc->device_reset_state,
		    IGB_DEVICE_RESET_PREPARED, IGB_DEVICE_RESET_NONE))
			return (true);
		return (false);
	}

	state = atomic_swap_32(&sc->device_reset_state,
	    IGB_DEVICE_RESET_DETECTED);
	if (state != IGB_DEVICE_RESET_DETECTED) {
		iflib_request_reset_if_up(sc->ctx);
		iflib_admin_intr_deferred(sc->ctx);
	}
	return (true);
}

/*
 * A PCIe-region parity failure stops PCIe and DMA traffic.  I350, I354,
 * I210, and I211 require a port reset before master disable in this case.
 * 82580 stops PCIe traffic for a fatal error in any host-owned region, so use
 * the same order for every 82580 recovery.  This differs from the normal
 * reset path, which disables the bus master first.
 *
 * Indications that relatch after admin accounting are discarded during
 * reset; sticky bits cannot distinguish them from the saved event.
 */
static void
em_prepare_fatal_error_reset(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	s32 error;
	u32 ctrl, pcieecc, pcieerr;
	int i;

	if (!em_has_peind_memory_errors(&sc->hw) ||
	    atomic_load_acq_32(&sc->fatal_error_state) !=
	    EM_FATAL_ERROR_RESET_REQUESTED)
		return;

	pcieerr = sc->fatal_error_pcie |
	    (E1000_READ_REG(&sc->hw, E1000_PCIEERRSTS) &
	    em_pcie_fatal_error_mask(&sc->hw));
	pcieecc = sc->fatal_error_pcie_ecc;
	if (!em_has_82580_memory_errors(&sc->hw) &&
	    (sc->fatal_error_peind & E1000_PEIND_PCIE_PARITY_FATAL) == 0 &&
	    pcieerr == 0)
		return;

	hw = &sc->hw;
	ctrl = E1000_READ_REG(hw, E1000_CTRL);
	E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);
	/* Do not access device registers for at least 3 ms after RST. */
	msec_delay(3);
	for (i = 0; i < AUTO_READ_DONE_TIMEOUT; i++) {
		if ((E1000_READ_REG(hw, E1000_EECD) &
		    E1000_EECD_AUTO_RD) != 0 &&
		    (em_has_82580_memory_errors(hw) ||
		    (E1000_READ_REG(hw, E1000_STATUS) &
		    E1000_STATUS_RST_DONE) != 0))
			break;
		msec_delay(1);
	}
	if (i == AUTO_READ_DONE_TIMEOUT)
		device_printf(sc->dev,
		    "port reset did not complete during parity recovery\n");
	error = e1000_disable_pcie_master_generic(hw);
	if (error != E1000_SUCCESS)
		device_printf(sc->dev,
		    "PCIe master disable failed during parity recovery: %d\n",
		    error);
	pcieerr |= E1000_READ_REG(hw, E1000_PCIEERRSTS) &
	    em_pcie_fatal_error_mask(hw);
	if (pcieerr != 0)
		E1000_WRITE_REG(hw, E1000_PCIEERRSTS, pcieerr);
	if (em_has_82580_memory_errors(hw)) {
		pcieecc |= E1000_READ_REG(hw, E1000_PCIEECCSTS) &
		    E1000_PCIEECCSTS_82580_ERROR_MASK;
		if (pcieecc != 0)
			E1000_WRITE_REG(hw, E1000_PCIEECCSTS, pcieecc);
	}
	atomic_store_rel_32(&sc->fatal_error_state,
	    EM_FATAL_ERROR_RESET_PREPARED);
}

static void
em_finish_fatal_error_reset(struct e1000_softc *sc)
{
	struct e1000_hw *hw;
	u32 dma_host, dma_rx, dma_tx, lanerr, pcieecc, pcieerr;
	u32 state;

	state = atomic_load_acq_32(&sc->fatal_error_state);
	if (state != EM_FATAL_ERROR_RESET_REQUESTED &&
	    state != EM_FATAL_ERROR_RESET_PREPARED)
		return;

	hw = &sc->hw;
	if (em_has_82575_memory_errors(hw)) {
		sc->fatal_error_dma_tx = 0;
		sc->fatal_error_dma_rx = 0;
	} else if (em_has_82576_memory_errors(hw)) {
		/* Drain any indication relatched while the port was resetting. */
		(void)E1000_READ_REG(hw, E1000_PEIND);
		sc->fatal_error_peind = 0;
	} else if (em_has_82580_memory_errors(hw)) {
		pcieerr = sc->fatal_error_pcie |
		    E1000_READ_REG(hw, E1000_PCIEERRSTS);
		if (pcieerr != 0)
			E1000_WRITE_REG(hw, E1000_PCIEERRSTS, pcieerr);
		pcieecc = sc->fatal_error_pcie_ecc |
		    (E1000_READ_REG(hw, E1000_PCIEECCSTS) &
		    E1000_PCIEECCSTS_82580_ERROR_MASK);
		if (pcieecc != 0)
			E1000_WRITE_REG(hw, E1000_PCIEECCSTS, pcieecc);
		dma_tx = sc->fatal_error_dma_tx |
		    E1000_READ_REG(hw, E1000_DTPARS_82580);
		if (dma_tx != 0)
			E1000_WRITE_REG(hw, E1000_DTPARS_82580, dma_tx);
		dma_rx = sc->fatal_error_dma_rx |
		    E1000_READ_REG(hw, E1000_DRPARS_82580);
		if (dma_rx != 0)
			E1000_WRITE_REG(hw, E1000_DRPARS_82580, dma_rx);
		dma_host = sc->fatal_error_dma_host |
		    E1000_READ_REG(hw, E1000_DDPARS_82580);
		if (dma_host != 0)
			E1000_WRITE_REG(hw, E1000_DDPARS_82580, dma_host);
		/* LANPERRSTS is read-only and is cleared by the port reset. */
		lanerr = E1000_READ_REG(hw, E1000_LANPERRSTS) &
		    E1000_LANPERRSTS_82580_ERROR_MASK;
		if (lanerr != 0)
			device_printf(sc->dev,
			    "LAN parity status remained set after reset: %#x\n",
			    lanerr);
		(void)E1000_READ_REG(hw, E1000_PEIND);
		sc->fatal_error_peind = 0;
		sc->fatal_error_pcie = 0;
		sc->fatal_error_pcie_ecc = 0;
		sc->fatal_error_lan = 0;
		sc->fatal_error_dma_tx = 0;
		sc->fatal_error_dma_rx = 0;
		sc->fatal_error_dma_host = 0;
	} else if (em_has_peind_memory_errors(hw)) {
		pcieerr = sc->fatal_error_pcie |
		    (E1000_READ_REG(hw, E1000_PCIEERRSTS) &
		    em_pcie_fatal_error_mask(hw));
		if (pcieerr != 0)
			E1000_WRITE_REG(hw, E1000_PCIEERRSTS, pcieerr);
		if (em_has_i350_i354_memory_errors(hw)) {
			dma_tx = sc->fatal_error_dma_tx |
			    (E1000_READ_REG(hw, E1000_DTPARS) &
			    E1000_DTPARS_FATAL_MASK);
			if (dma_tx != 0)
				E1000_WRITE_REG(hw, E1000_DTPARS, dma_tx);
			dma_rx = sc->fatal_error_dma_rx |
			    (E1000_READ_REG(hw, E1000_DRPARS) &
			    E1000_DRPARS_FATAL_MASK);
			if (dma_rx != 0)
				E1000_WRITE_REG(hw, E1000_DRPARS, dma_rx);
			lanerr = sc->fatal_error_lan |
			    (E1000_READ_REG(hw, E1000_LANPERRSTS) &
			    E1000_LANPERRSTS_I350_I354_FATAL_MASK);
		} else {
			lanerr = sc->fatal_error_lan |
			    (E1000_READ_REG(hw, E1000_LANPERRSTS) &
			    E1000_LANPERRSTS_RETX_BUF);
		}
		if (lanerr != 0)
			E1000_WRITE_REG(hw, E1000_LANPERRSTS, lanerr);
		/*
		 * RST can relatch PEIND from a subordinate status register
		 * before that register is cleared.  Drain the recovered
		 * indication before unmasking FER.
		 */
		(void)E1000_READ_REG(hw, E1000_PEIND);
		sc->fatal_error_peind = 0;
		sc->fatal_error_pcie = 0;
		sc->fatal_error_pcie_ecc = 0;
		sc->fatal_error_lan = 0;
		sc->fatal_error_dma_tx = 0;
		sc->fatal_error_dma_rx = 0;
		sc->fatal_error_dma_host = 0;
	}
	sc->fatal_error_icr = 0;
	sc->fatal_error_pbeccsts = 0;
	atomic_store_rel_32(&sc->fatal_error_state, EM_FATAL_ERROR_NONE);
}

/*********************************************************************
 *
 *  Fast Legacy/MSI Combined Interrupt Service routine
 *
 *********************************************************************/
int
em_intr(void *arg)
{
	struct e1000_softc *sc = arg;
	struct e1000_hw *hw = &sc->hw;
	struct em_rx_queue *que = &sc->rx_queues[0];
	struct rx_ring *rxr = &que->rxr;
	if_ctx_t ctx = sc->ctx;
	u32 reg_icr;

	reg_icr = E1000_READ_REG(hw, E1000_ICR);

	/* Hot eject? */
	if (reg_icr == 0xffffffff)
		return FILTER_STRAY;

	/* Definitely not our interrupt. */
	if (reg_icr == 0x0)
		return FILTER_STRAY;

	/*
	 * Starting with the 82571 chip, bit 31 should be used to
	 * determine whether the interrupt belongs to us.
	 */
	if (hw->mac.type >= e1000_82571 &&
	    (reg_icr & E1000_ICR_INT_ASSERTED) == 0)
		return FILTER_STRAY;
	if (igb_handle_device_reset(sc, reg_icr))
		return (FILTER_HANDLED);
	if (igb_device_reset_pending(sc))
		return (FILTER_HANDLED);

	/*
	 * IAM auto-masks igb shared interrupts when ICR is read.  Older em
	 * hardware still needs an explicit disable, which also works around
	 * MSI message reordering errata on certain systems.
	 */
	if (sc->vf_ifp || hw->mac.type < igb_mac_min)
		IFDI_INTR_DISABLE(ctx);

	/* Link status change */
	if (reg_icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))
		em_handle_link(ctx);

	if (reg_icr & E1000_ICR_RXO)
		sc->rx_overruns++;

	em_handle_fatal_error_intr(sc, reg_icr);

	if (hw->mac.type >= e1000_82540)
		em_newitr(sc, que, rxr);

	return (FILTER_SCHEDULE_THREAD);
}

static int
em_if_rx_queue_intr_enable(if_ctx_t ctx, uint16_t rxqid)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct em_rx_queue *rxq = &sc->rx_queues[rxqid];

	E1000_WRITE_REG(&sc->hw, E1000_IMS, rxq->eims);
	return (0);
}

static int
em_if_tx_queue_intr_enable(if_ctx_t ctx, uint16_t txqid)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct em_tx_queue *txq = &sc->tx_queues[txqid];

	E1000_WRITE_REG(&sc->hw, E1000_IMS, txq->eims);
	return (0);
}

static int
igb_if_rx_queue_intr_enable(if_ctx_t ctx, uint16_t rxqid)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct em_rx_queue *rxq = &sc->rx_queues[rxqid];

	if (igb_device_reset_pending(sc))
		return (0);
	E1000_WRITE_REG(&sc->hw, E1000_EIMS, rxq->eims);
	return (0);
}

static int
igb_if_tx_queue_intr_enable(if_ctx_t ctx, uint16_t txqid)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct em_tx_queue *txq = &sc->tx_queues[txqid];

	if (igb_device_reset_pending(sc))
		return (0);
	E1000_WRITE_REG(&sc->hw, E1000_EIMS, txq->eims);
	return (0);
}

/*********************************************************************
 *
 *  MSI-X RX Interrupt Service routine
 *
 **********************************************************************/
static int
em_msix_que(void *arg)
{
	struct em_rx_queue *que = arg;
	struct e1000_softc *sc = que->sc;
	struct rx_ring *rxr = &que->rxr;

	++que->irqs;

	if (igb_device_reset_pending(sc))
		return (FILTER_HANDLED);
	em_newitr(sc, que, rxr);

	return (FILTER_SCHEDULE_THREAD);
}

/*********************************************************************
 *
 *  MSI-X Link Fast Interrupt Service routine
 *
 **********************************************************************/
static int
em_msix_link(void *arg)
{
	struct e1000_softc *sc = arg;
	u32 reg_icr;

	++sc->link_irq;
	MPASS(sc->hw.back != NULL);
	/*
	 * The VF's admin vector represents mailbox and link activity.  It has
	 * no PF ICR at E1000_ICR, so process every admin-vector interrupt,
	 * matching the igbvf misc-vector model.
	 */
	if (sc->vf_ifp) {
		sc->hw.mac.get_link_status = true;
		iflib_admin_intr_deferred(sc->ctx);
		E1000_WRITE_REG(&sc->hw, E1000_EIMS, sc->link_mask);
		return (FILTER_HANDLED);
	}

	reg_icr = E1000_READ_REG(&sc->hw, E1000_ICR);
	if (igb_device_reset_pending(sc))
		return (FILTER_HANDLED);

	/*
	 * Enabling or disabling SR-IOV can briefly make PF MMIO reads return
	 * all ones.  This is not an interrupt cause; in particular, do not
	 * turn it into a malicious-driver event.
	 */
	if (__predict_false(reg_icr == 0xffffffff))
		goto rearm;
	if (igb_handle_device_reset(sc, reg_icr))
		return (FILTER_HANDLED);

	if (reg_icr & E1000_ICR_RXO)
		sc->rx_overruns++;

	if (reg_icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))
		em_handle_link(sc->ctx);
	if (reg_icr & E1000_ICR_MDDET)
		igb_iov_mdd_event(sc);
	if (reg_icr & E1000_ICR_VMMB)
		iflib_admin_intr_deferred(sc->ctx);
	em_handle_fatal_error_intr(sc, reg_icr);

rearm:
	/* Re-arm unconditionally */
	if (sc->hw.mac.type >= igb_mac_min) {
		E1000_WRITE_REG(&sc->hw, E1000_IMS,
		    E1000_IMS_LSC | igb_device_reset_intr_mask(sc) |
		    igb_iov_intr_mask(sc) |
		    em_fatal_error_intr_mask(sc));
		E1000_WRITE_REG(&sc->hw, E1000_EIMS, sc->link_mask);
	} else if (sc->hw.mac.type == e1000_82574) {
		E1000_WRITE_REG(&sc->hw, E1000_IMS,
		    E1000_IMS_LSC | E1000_IMS_OTHER);
		/*
		 * Because we must read the ICR for this interrupt it may
		 * clear other causes using autoclear, for this reason we
		 * simply create a soft interrupt for all these vectors.
		 */
		if (reg_icr)
			E1000_WRITE_REG(&sc->hw, E1000_ICS, sc->ims);
	} else
		E1000_WRITE_REG(&sc->hw, E1000_IMS,
		    E1000_IMS_LSC | em_fatal_error_intr_mask(sc));

	return (FILTER_HANDLED);
}

static void
em_handle_link(void *context)
{
	if_ctx_t ctx = context;
	struct e1000_softc *sc = iflib_get_softc(ctx);

	sc->hw.mac.get_link_status = 1;
	iflib_admin_intr_deferred(ctx);
}

/*********************************************************************
 *
 *  Media Ioctl callback
 *
 *  This routine is called whenever the user queries the status of
 *  the interface using ifconfig.
 *
 **********************************************************************/
static void
em_if_media_status(if_ctx_t ctx, struct ifmediareq *ifmr)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	u_char fiber_type = IFM_1000_SX;

	INIT_DEBUGOUT("em_if_media_status: begin");

	iflib_admin_intr_deferred(ctx);

	ifmr->ifm_status = IFM_AVALID;
	ifmr->ifm_active = IFM_ETHER;

	if (sc->link_state == EM_LINK_STATE_DOWN ||
	    sc->link_state == EM_LINK_STATE_DOWN_RESET_PENDING) {
		return;
	}

	ifmr->ifm_status |= IFM_ACTIVE;

	if ((sc->hw.phy.media_type == e1000_media_type_fiber) ||
	    (sc->hw.phy.media_type == e1000_media_type_internal_serdes)) {
		if (sc->hw.mac.type == e1000_82545)
			fiber_type = IFM_1000_LX;
		ifmr->ifm_active |= fiber_type | IFM_FDX;
	} else {
		switch (sc->link_speed) {
		case 10:
			ifmr->ifm_active |= IFM_10_T;
			break;
		case 100:
			ifmr->ifm_active |= IFM_100_TX;
			break;
		case 1000:
			ifmr->ifm_active |= IFM_1000_T;
			break;
		}
		if (sc->link_duplex == FULL_DUPLEX)
			ifmr->ifm_active |= IFM_FDX;
		else
			ifmr->ifm_active |= IFM_HDX;
	}
}

/*********************************************************************
 *
 *  Media Ioctl callback
 *
 *  This routine is called when the user changes speed/duplex using
 *  media/mediopt option with ifconfig.
 *
 **********************************************************************/
static int
em_if_media_change(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct ifmedia *ifm = iflib_get_media(ctx);

	INIT_DEBUGOUT("em_if_media_change: begin");

	if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
		return (EINVAL);

	switch (IFM_SUBTYPE(ifm->ifm_media)) {
	case IFM_AUTO:
		sc->hw.mac.autoneg = DO_AUTO_NEG;
		sc->hw.phy.autoneg_advertised = AUTONEG_ADV_DEFAULT;
		break;
	case IFM_1000_LX:
	case IFM_1000_SX:
	case IFM_1000_T:
		sc->hw.mac.autoneg = DO_AUTO_NEG;
		sc->hw.phy.autoneg_advertised = ADVERTISE_1000_FULL;
		break;
	case IFM_100_TX:
		sc->hw.mac.autoneg = false;
		sc->hw.phy.autoneg_advertised = 0;
		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
			sc->hw.mac.forced_speed_duplex = ADVERTISE_100_FULL;
		else
			sc->hw.mac.forced_speed_duplex = ADVERTISE_100_HALF;
		break;
	case IFM_10_T:
		sc->hw.mac.autoneg = false;
		sc->hw.phy.autoneg_advertised = 0;
		if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
			sc->hw.mac.forced_speed_duplex = ADVERTISE_10_FULL;
		else
			sc->hw.mac.forced_speed_duplex = ADVERTISE_10_HALF;
		break;
	default:
		device_printf(sc->dev, "Unsupported media type\n");
	}

	return (0);
}

static int
em_if_set_promisc(if_ctx_t ctx, int flags)
{
	struct e1000_softc *sc;

	sc = iflib_get_softc(ctx);
	if (em_if_defer_promisc(sc))
		return (0);
	return (em_if_set_promisc_impl(ctx, flags));
}

static bool
em_if_defer_promisc(struct e1000_softc *sc)
{
	switch (sc->hw.mac.type) {
	case e1000_82576:
	case e1000_i350:
	case e1000_vfadapt:
	case e1000_vfadapt_i350:
		break;
	default:
		return (false);
	}

	/*
	 * iflib drops its context lock around IFDI_PROMISC_SET.  Run mailbox
	 * and IOV register operations later from the locked admin task.
	 * A deferred VF mailbox rejection cannot be returned to ifconfig; the
	 * admin task logs it instead.
	 */
	atomic_set_32(&sc->promisc_pending, 1);
	iflib_admin_intr_deferred(sc->ctx);
	return (true);
}

int
em_if_set_promisc_impl(if_ctx_t ctx, int flags)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_t ifp = iflib_get_ifp(ctx);
	enum e1000_promisc_type type;
	s32 error;
	u32 reg_rctl;
	int mcnt = 0;

	if (sc->vf_ifp) {
		if (flags & IFF_PROMISC)
			type = e1000_promisc_enabled;
		else if (flags & IFF_ALLMULTI)
			type = e1000_promisc_multicast;
		else
			type = e1000_promisc_disabled;
		error = e1000_promisc_set_vf(&sc->hw, type);
		if (error != E1000_SUCCESS) {
			device_printf(sc->dev,
			    "VF promiscuous-mode request failed\n");
			return (EPERM);
		}
		return (0);
	}

	reg_rctl = E1000_READ_REG(&sc->hw, E1000_RCTL);
	reg_rctl &= ~(E1000_RCTL_SBP | E1000_RCTL_UPE);
	if (flags & IFF_ALLMULTI)
		mcnt = MAX_NUM_MULTICAST_ADDRESSES;
	else
		mcnt = min(if_llmaddr_count(ifp),
		    MAX_NUM_MULTICAST_ADDRESSES);

	if (mcnt < MAX_NUM_MULTICAST_ADDRESSES)
		reg_rctl &= (~E1000_RCTL_MPE);
	E1000_WRITE_REG(&sc->hw, E1000_RCTL, reg_rctl);

	if (flags & IFF_PROMISC) {
		reg_rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
		/* Turn this on if you want to see bad packets */
		if (em_debug_sbp)
			reg_rctl |= E1000_RCTL_SBP;
		E1000_WRITE_REG(&sc->hw, E1000_RCTL, reg_rctl);
		if (igb_iov_enabled(sc))
			em_if_vlan_filter_enable(sc);
		else
			em_if_vlan_filter_disable(sc);
	} else {
		if (flags & IFF_ALLMULTI) {
			reg_rctl |= E1000_RCTL_MPE;
			reg_rctl &= ~E1000_RCTL_UPE;
			E1000_WRITE_REG(&sc->hw, E1000_RCTL, reg_rctl);
		}
		if (igb_iov_enabled(sc) || em_if_vlan_filter_used(ctx))
			em_if_vlan_filter_enable(sc);
	}
	igb_iov_update_pf_vmolr(sc);
	igb_iov_rebuild_vlan(sc);
	return (0);
}

static u_int
em_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int idx)
{
	u8 *mta = arg;

	if (idx == MAX_NUM_MULTICAST_ADDRESSES)
		return (0);

	bcopy(LLADDR(sdl), &mta[idx * ETHER_ADDR_LEN], ETHER_ADDR_LEN);

	return (1);
}

/* Make every multicast hash eligible on parts whose wake matcher needs MTA. */
static void
em_fill_wakeup_mta(struct e1000_hw *hw)
{
	int i;

	memset(hw->mac.mta_shadow, 0xff, sizeof(hw->mac.mta_shadow));
	for (i = hw->mac.mta_reg_count - 1; i >= 0; i--)
		E1000_WRITE_REG_ARRAY(hw, E1000_MTA, i,
		    hw->mac.mta_shadow[i]);
	E1000_WRITE_FLUSH(hw);
}

/*********************************************************************
 *  Multicast Update
 *
 *  This routine is called whenever multicast address list is updated.
 *
 **********************************************************************/
static void
em_if_multi_set(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_t ifp = iflib_get_ifp(ctx);
	u8 *mta; /* Multicast array memory */
	u32 reg_rctl = 0;
	int mcnt = 0;

	IOCTL_DEBUGOUT("em_set_multi: begin");

	mta = sc->mta;
	bzero(mta, sizeof(u8) * ETHER_ADDR_LEN * MAX_NUM_MULTICAST_ADDRESSES);

	if (sc->hw.mac.type == e1000_82542 &&
	    sc->hw.revision_id == E1000_REVISION_2) {
		reg_rctl = E1000_READ_REG(&sc->hw, E1000_RCTL);
		if (sc->hw.bus.pci_cmd_word & CMD_MEM_WRT_INVALIDATE)
			e1000_pci_clear_mwi(&sc->hw);
		reg_rctl |= E1000_RCTL_RST;
		E1000_WRITE_REG(&sc->hw, E1000_RCTL, reg_rctl);
		msec_delay(5);
	}

	mcnt = if_foreach_llmaddr(ifp, em_copy_maddr, mta);

	if (sc->vf_ifp) {
		e1000_update_mc_addr_list(&sc->hw, mta, mcnt);
		igbv_update_uc_addr_list(sc, ifp);
		return;
	}

	if (mcnt < MAX_NUM_MULTICAST_ADDRESSES &&
	    !igb_iov_enabled(sc))
		e1000_update_mc_addr_list(&sc->hw, mta, mcnt);

	reg_rctl = E1000_READ_REG(&sc->hw, E1000_RCTL);

	if (if_getflags(ifp) & IFF_PROMISC)
		reg_rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
	else if (mcnt >= MAX_NUM_MULTICAST_ADDRESSES ||
	    if_getflags(ifp) & IFF_ALLMULTI) {
		reg_rctl |= E1000_RCTL_MPE;
		reg_rctl &= ~E1000_RCTL_UPE;
	} else
		reg_rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);

	E1000_WRITE_REG(&sc->hw, E1000_RCTL, reg_rctl);

	if (sc->hw.mac.type == e1000_82542 &&
	    sc->hw.revision_id == E1000_REVISION_2) {
		reg_rctl = E1000_READ_REG(&sc->hw, E1000_RCTL);
		reg_rctl &= ~E1000_RCTL_RST;
		E1000_WRITE_REG(&sc->hw, E1000_RCTL, reg_rctl);
		msec_delay(5);
		if (sc->hw.bus.pci_cmd_word & CMD_MEM_WRT_INVALIDATE)
			e1000_pci_set_mwi(&sc->hw);
	}
	igb_iov_rebuild_mta(sc);
	igb_iov_update_pf_vmolr(sc);
}

/*********************************************************************
 *  Timer routine
 *
 *  This routine schedules em_if_update_admin_status() to check for
 *  link status and to gather statistics as well as to perform some
 *  controller-specific hardware patting.
 *
 **********************************************************************/
static void
em_if_timer(if_ctx_t ctx, uint16_t qid)
{
	struct e1000_softc *sc;

	if (qid != 0)
		return;

	sc = iflib_get_softc(ctx);
	atomic_set_32(&sc->stats_pending, 1);
	iflib_admin_intr_deferred(ctx);
}

static void
em_if_update_admin_status(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	device_t dev = iflib_get_dev(ctx);
	u32 link_check, thstat, ctrl;
	bool reset_requested = false;

	KASSERT(!sc->vf_ifp, ("%s called for a VF", __func__));
	if (em_handle_fatal_error_admin(sc))
		return;
	/* A sibling-port reset invalidated the registers and VF mailboxes. */
	if (atomic_cmpset_acq_32(&sc->device_reset_state,
	    IGB_DEVICE_RESET_DETECTED, IGB_DEVICE_RESET_REQUESTED)) {
		if (sc->link_state == EM_LINK_STATE_UP)
			iflib_link_state_change(ctx, LINK_STATE_DOWN, 0);
		sc->link_speed = 0;
		sc->link_duplex = 0;
		sc->link_state = EM_LINK_STATE_DOWN_RESET_PENDING;
		/* Request the reset here; interrupt filters cannot take STATE_LOCK. */
		iflib_request_reset_if_up(ctx);
		/* Re-enter the admin task so it observes the reset request. */
		iflib_admin_intr_deferred(ctx);
		return;
	}
	if (atomic_load_acq_32(&sc->device_reset_state) !=
	    IGB_DEVICE_RESET_NONE)
		return;

	if (atomic_readandclear_32(&sc->promisc_pending) != 0)
		(void)em_if_set_promisc_impl(ctx,
		    if_getflags(iflib_get_ifp(ctx)));
	igb_iov_handle_mdd(sc);
	igb_iov_handle_mbx(sc);

	link_check = thstat = ctrl = 0;
	/* Get the cached link value or read phy for real */
	switch (hw->phy.media_type) {
	case e1000_media_type_copper:
		if (hw->mac.get_link_status) {
			if (hw->mac.type == e1000_pch_spt)
				msec_delay(50);
			/* Do the work to read phy */
			e1000_check_for_link(hw);
			link_check = !hw->mac.get_link_status;
			if (link_check) /* ESB2 fix */
				e1000_cfg_on_link_up(hw);
		} else {
			link_check = true;
		}
		break;
	case e1000_media_type_fiber:
		e1000_check_for_link(hw);
		link_check =
		    (E1000_READ_REG(hw, E1000_STATUS) & E1000_STATUS_LU);
		break;
	case e1000_media_type_internal_serdes:
		e1000_check_for_link(hw);
		link_check = hw->mac.serdes_has_link;
		break;
	default:
		break;
	}

	/* Check for thermal downshift or shutdown */
	if (hw->mac.type == e1000_i350) {
		thstat = E1000_READ_REG(hw, E1000_THSTAT);
		ctrl = E1000_READ_REG(hw, E1000_CTRL_EXT);
	}

	/* Now check for a transition */
	if (link_check &&
	    (sc->link_state == EM_LINK_STATE_DOWN ||
	    sc->link_state == EM_LINK_STATE_DOWN_RESET_PENDING)) {
		bool reset_pending;

		reset_pending =
		    sc->link_state == EM_LINK_STATE_DOWN_RESET_PENDING;
		e1000_get_speed_and_duplex(hw, &sc->link_speed,
		    &sc->link_duplex);
		/* Check if we must disable SPEED_MODE bit on PCI-E */
		if ((sc->link_speed != SPEED_1000) &&
		    ((hw->mac.type == e1000_82571) ||
		    (hw->mac.type == e1000_82572))) {
			int tarc0;
			tarc0 = E1000_READ_REG(hw, E1000_TARC(0));
			tarc0 &= ~TARC_SPEED_MODE_BIT;
			E1000_WRITE_REG(hw, E1000_TARC(0), tarc0);
		}
		if (bootverbose)
			device_printf(dev, "Link is up %d Mbps %s\n",
			    sc->link_speed,
			    ((sc->link_duplex == FULL_DUPLEX) ?
			    "Full Duplex" : "Half Duplex"));
		sc->link_state = EM_LINK_STATE_UP;
		sc->smartspeed = 0;
		if (hw->mac.type == e1000_i350 &&
		    (ctrl & E1000_CTRL_EXT_LINK_MODE_MASK) ==
		    E1000_CTRL_EXT_LINK_MODE_GMII &&
		    (thstat & E1000_THSTAT_LINK_THROTTLE))
			device_printf(dev, "Link: thermal downshift\n");
		/* Delay Link Up for Phy update */
		if (((hw->mac.type == e1000_i210) ||
		    (hw->mac.type == e1000_i211)) &&
		    (hw->phy.id == I210_I_PHY_ID))
			msec_delay(I210_LINK_DELAY);
		/* Reset if the media type changed. */
		if (hw->dev_spec._82575.media_changed &&
		    hw->mac.type >= igb_mac_min) {
			hw->dev_spec._82575.media_changed = false;
			sc->flags |= IGB_MEDIA_RESET;
			iflib_request_reset(ctx);
			iflib_admin_intr_deferred(ctx);
			reset_requested = true;
		}
		/* Only do TSO on gigabit for older chips due to errata */
		if (hw->mac.type < igb_mac_min)
			reset_requested = em_automask_tso(ctx);

		if (reset_pending || reset_requested) {
			/*
			 * The PHY is up, but publish it only after the TSO
			 * capability-change reset.
			 */
			sc->link_state = EM_LINK_STATE_UP_RESET_PENDING;
		} else {
			iflib_link_state_change(ctx, LINK_STATE_UP,
			    IF_Mbps(sc->link_speed));
		}
		igb_iov_ping_all_vfs(sc);
	} else if (!link_check &&
	    (sc->link_state == EM_LINK_STATE_UP ||
	    sc->link_state == EM_LINK_STATE_UP_RESET_PENDING)) {
		bool link_was_published;
		bool reset_pending;

		link_was_published = sc->link_state == EM_LINK_STATE_UP;
		reset_pending =
		    sc->link_state == EM_LINK_STATE_UP_RESET_PENDING;
		sc->link_speed = 0;
		sc->link_duplex = 0;
		sc->link_state = reset_pending ?
		    EM_LINK_STATE_DOWN_RESET_PENDING : EM_LINK_STATE_DOWN;
		if (link_was_published)
			iflib_link_state_change(ctx, LINK_STATE_DOWN, 0);
		igb_iov_ping_all_vfs(sc);
	}
	/*
	 * Mailbox, link, and timer events share this admin task.  The PF
	 * statistics sweep performs 66 MMIO reads, so run it only when the
	 * ordinary iflib timer requests a sample rather than once per mailbox
	 * message.  Exported counters can consequently trail hardware by the
	 * timer interval (normally 500 ms).
	 */
	if (atomic_readandclear_32(&sc->stats_pending) != 0) {
		em_update_stats_counters(sc);
		/*
		 * The 82574 PHY can enter a state in which both its receive
		 * error and idle error counters saturate.  Require two
		 * consecutive timer samples before resetting, matching Intel's
		 * e1000e recovery policy and avoiding a reset on a transient
		 * register sample.
		 */
		if (hw->mac.type == e1000_82574) {
			if (e1000_check_phy_82574(hw))
				sc->phy_hang_count++;
			else
				sc->phy_hang_count = 0;
			if (sc->phy_hang_count > 1) {
				sc->phy_hang_count = 0;
				device_printf(dev,
				    "PHY appears hung; requesting reset\n");
				iflib_request_reset(ctx);
				iflib_admin_intr_deferred(ctx);
				return;
			}
		}
	}

	/* Reset LAA into RAR[0] on 82571 */
	if (hw->mac.type == e1000_82571 && e1000_get_laa_state_82571(hw))
		e1000_rar_set(hw, hw->mac.addr, 0);

	if (hw->mac.type < em_mac_min)
		lem_smartspeed(sc);
}

/*
 * Last-resort DMA fence.  iflib releases DMA mappings after the driver's
 * stop callback, so continuing with bus mastering still enabled would turn
 * a recoverable NIC failure into memory corruption.  Treat failure of the
 * PCI command bit as a fail-stop invariant violation.
 */
static void
em_fence_pci_busmaster(struct e1000_softc *sc)
{
	device_t dev;
	u_int timeout;
	u16 command;
	int error;

	dev = sc->dev;
	error = pci_disable_busmaster(dev);
	command = pci_read_config(dev, PCIR_COMMAND, 2);
	if (command != 0xffff && (command & PCIM_CMD_BUSMASTEREN) != 0)
		panic("%s: unable to fence device DMA (error %d)",
		    device_get_nameunit(dev), error);
	if (error != 0 && command != 0xffff)
		device_printf(dev,
		    "PCI bus-master disable returned %d; readback is disabled\n",
		    error);

	timeout = max(pcie_get_max_completion_timeout(dev) / 1000, 10);
	if (command != 0xffff &&
	    !pcie_wait_for_pending_transactions(dev, timeout)) {
		/* A function removed during the wait can no longer issue DMA. */
		command = pci_read_config(dev, PCIR_COMMAND, 2);
		if (command != 0xffff)
			panic("%s: DMA transactions remain pending after fencing",
			    device_get_nameunit(dev));
	}
}

static int
em_enable_pci_busmaster(struct e1000_softc *sc)
{
	device_t dev;
	u16 command;
	int error;

	dev = sc->dev;
	command = pci_read_config(dev, PCIR_COMMAND, 2);
	if (command == 0xffff)
		return (ENXIO);
	if ((command & PCIM_CMD_BUSMASTEREN) != 0)
		return (0);

	error = pci_enable_busmaster(dev);
	command = pci_read_config(dev, PCIR_COMMAND, 2);
	if (command == 0xffff)
		return (ENXIO);
	if ((command & PCIM_CMD_BUSMASTEREN) == 0)
		return (error != 0 ? error : EIO);
	return (0);
}

/*********************************************************************
 *
 *  This routine disables all traffic on the adapter by issuing a
 *  global reset on the MAC.
 *
 **********************************************************************/
static void
em_if_stop(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	s32 error;

	INIT_DEBUGOUT("em_if_stop: begin");

	if (sc->vf_ifp) {
		igbv_queue_retry_stop(sc);
		igbv_mbx_retry_stop(sc);
	}

	/* I219 needs special flushing to avoid hangs */
	if (sc->hw.mac.type >= e1000_pch_spt && sc->hw.mac.type < igb_mac_min)
		em_flush_desc_rings(sc);

	igb_iov_reset_prepare(sc);
	if (!sc->vf_ifp ||
	    (atomic_load_acq_32(&sc->vf_mbx_ready) != 0 &&
	    (if_getflags(iflib_get_ifp(ctx)) & IFF_UP) == 0)) {
		em_prepare_fatal_error_reset(sc);
		error = e1000_reset_hw(&sc->hw);
		if (!sc->vf_ifp && error != E1000_SUCCESS) {
			device_printf(sc->dev, "Hardware reset failed while "
			    "stopping: %d\n", error);
			return;
		}
	}
	if (sc->vf_ifp) {
		sc->vf_queues_sanitized = igbv_sanitize_queues(sc);
		atomic_store_rel_32(&sc->vf_mbx_ready, 0);
		if (!sc->vf_queues_sanitized)
			em_fence_pci_busmaster(sc);
	}
	if (sc->hw.mac.type >= e1000_82544 && !sc->vf_ifp)
		E1000_WRITE_REG(&sc->hw, E1000_WUFC, 0);

	if (!sc->vf_ifp) {
		e1000_led_off(&sc->hw);
		e1000_cleanup_led(&sc->hw);
	} else {
		sc->link_speed = 0;
		sc->link_duplex = 0;
		if (sc->link_state != EM_LINK_STATE_DOWN) {
			sc->link_state = EM_LINK_STATE_DOWN;
			iflib_link_state_change(ctx, LINK_STATE_DOWN, 0);
		}
	}
}

/*********************************************************************
 *
 *  Determine hardware revision.
 *
 **********************************************************************/
static void
em_identify_hardware(if_ctx_t ctx)
{
	device_t dev = iflib_get_dev(ctx);
	struct e1000_softc *sc = iflib_get_softc(ctx);

	/* Make sure our PCI config space has the necessary stuff set */
	sc->hw.bus.pci_cmd_word = pci_read_config(dev, PCIR_COMMAND, 2);

	/* Save off the information about this board */
	sc->hw.vendor_id = pci_get_vendor(dev);
	sc->hw.device_id = pci_get_device(dev);
	sc->hw.revision_id = pci_read_config(dev, PCIR_REVID, 1);
	sc->hw.subsystem_vendor_id = pci_read_config(dev, PCIR_SUBVEND_0, 2);
	sc->hw.subsystem_device_id = pci_read_config(dev, PCIR_SUBDEV_0, 2);

	/* Do Shared Code Init and Setup */
	if (e1000_set_mac_type(&sc->hw)) {
		device_printf(dev, "Setup init failure\n");
		return;
	}

	/*
	 * Function type comes from the selected iflib shared context, not from
	 * enum ordering.  Keep the detected MAC type as an independent check
	 * that the igb/igbv probe tables selected the right policy.
	 */
	KASSERT(sc->vf_ifp ==
	    (sc->hw.mac.type == e1000_vfadapt ||
	    sc->hw.mac.type == e1000_vfadapt_i350),
	    ("%s: iflib function type and MAC type disagree", __func__));
}

static int
em_allocate_pci_resources(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	device_t dev = iflib_get_dev(ctx);
	int rid, val;

	rid = PCIR_BAR(0);
	sc->memory = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
	    RF_ACTIVE);
	if (sc->memory == NULL) {
		device_printf(dev,
		    "Unable to allocate bus resource: memory\n");
		return (ENXIO);
	}
	sc->osdep.mem_bus_space_tag = rman_get_bustag(sc->memory);
	sc->osdep.mem_bus_space_handle = rman_get_bushandle(sc->memory);
#ifdef INVARIANTS
	sc->osdep.mem_bus_space_size = rman_get_size(sc->memory);
#endif
	sc->hw.hw_addr = (u8 *)&sc->osdep.mem_bus_space_handle;

	/* Only older adapters use IO mapping */
	if (sc->hw.mac.type < em_mac_min && sc->hw.mac.type > e1000_82543) {
		/* Figure our where our IO BAR is ? */
		for (rid = PCIR_BAR(0); rid < PCIR_CIS;) {
			val = pci_read_config(dev, rid, 4);
			if (EM_BAR_TYPE(val) == EM_BAR_TYPE_IO) {
				break;
			}
			rid += 4;
			/* check for 64bit BAR */
			if (EM_BAR_MEM_TYPE(val) == EM_BAR_MEM_TYPE_64BIT)
				rid += 4;
		}
		if (rid >= PCIR_CIS) {
			device_printf(dev, "Unable to locate IO BAR\n");
			return (ENXIO);
		}
		sc->ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
		    &rid, RF_ACTIVE);
		if (sc->ioport == NULL) {
			device_printf(dev,
			    "Unable to allocate bus resource: ioport\n");
			return (ENXIO);
		}
		sc->hw.io_base = 0;
		sc->osdep.io_bus_space_tag =
		    rman_get_bustag(sc->ioport);
		sc->osdep.io_bus_space_handle =
		    rman_get_bushandle(sc->ioport);
	}

	sc->hw.back = &sc->osdep;

	return (0);
}

/*********************************************************************
 *
 *  Set up the MSI-X Interrupt handlers
 *
 **********************************************************************/
static int
em_if_msix_intr_assign(if_ctx_t ctx, int msix)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct em_rx_queue *rx_que = sc->rx_queues;
	struct em_tx_queue *tx_que = sc->tx_queues;
	int error, rid, i, vector = 0, rx_vectors;
	char buf[16];

	/* First set up ring resources */
	for (i = 0; i < sc->rx_num_queues; i++, rx_que++, vector++) {
		rid = vector + 1;
		snprintf(buf, sizeof(buf), "rxq%d", i);
		error = iflib_irq_alloc_generic(ctx, &rx_que->que_irq, rid,
		    IFLIB_INTR_RXTX, em_msix_que, rx_que, rx_que->me, buf);
		if (error) {
			device_printf(iflib_get_dev(ctx),
			    "Failed to allocate que int %d err: %d",
			    i, error);
			sc->rx_num_queues = i + 1;
			goto fail;
		}

		rx_que->msix =  vector;

		/*
		 * Set the bit to enable interrupt
		 * in E1000_IMS -- bits 20 and 21
		 * are for RX0 and RX1, note this has
		 * NOTHING to do with the MSI-X vector
		 */
		if (sc->hw.mac.type == e1000_82574) {
			rx_que->eims = 1 << (20 + i);
			sc->ims |= rx_que->eims;
			sc->ivars |= (8 | rx_que->msix) << (i * 4);
		} else if (sc->hw.mac.type == e1000_82575)
			rx_que->eims = E1000_EICR_TX_QUEUE0 << vector;
		else
			rx_que->eims = 1 << vector;
	}
	rx_vectors = vector;

	vector = 0;
	for (i = 0; i < sc->tx_num_queues; i++, tx_que++, vector++) {
		snprintf(buf, sizeof(buf), "txq%d", i);
		tx_que = &sc->tx_queues[i];
		iflib_softirq_alloc_generic(ctx,
		    &sc->rx_queues[i % sc->rx_num_queues].que_irq,
		    IFLIB_INTR_TX, tx_que, tx_que->me, buf);

		tx_que->msix = (vector % sc->rx_num_queues);

		/*
		 * Set the bit to enable interrupt
		 * in E1000_IMS -- bits 22 and 23
		 * are for TX0 and TX1, note this has
		 * NOTHING to do with the MSI-X vector
		 */
		if (sc->hw.mac.type == e1000_82574) {
			tx_que->eims = 1 << (22 + i);
			sc->ims |= tx_que->eims;
			sc->ivars |= (8 | tx_que->msix) << (8 + (i * 4));
		} else if (sc->hw.mac.type == e1000_82575) {
			tx_que->eims = E1000_EICR_TX_QUEUE0 << i;
		} else {
			tx_que->eims = 1 << i;
		}
	}

	/* Link interrupt */
	rid = rx_vectors + 1;
	error = iflib_irq_alloc_generic(ctx, &sc->irq, rid, IFLIB_INTR_ADMIN,
	    em_msix_link, sc, 0, "aq");

	if (error) {
		device_printf(iflib_get_dev(ctx),
		    "Failed to register admin handler");
		goto fail;
	}
	sc->linkvec = rx_vectors;
	if (sc->hw.mac.type < igb_mac_min) {
		sc->ivars |=  (8 | rx_vectors) << 16;
		sc->ivars |= 0x80000000;
		/* Enable the "Other" interrupt type for link status change */
		sc->ims |= E1000_IMS_OTHER;
	}

	return (0);
fail:
	iflib_irq_free(ctx, &sc->irq);
	rx_que = sc->rx_queues;
	for (int i = 0; i < sc->rx_num_queues; i++, rx_que++)
		iflib_irq_free(ctx, &rx_que->que_irq);
	return (error);
}

static void
igb_configure_queues(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	struct em_rx_queue *rx_que;
	struct em_tx_queue *tx_que;
	u32 tmp, ivar = 0;

	/*
	 * Queue ownership can change when SR-IOV is enabled or disabled.
	 * Rebuild the interrupt mask for the current layout instead of
	 * retaining vectors from a previous initialization.
	 */
	sc->que_mask = 0;
	sc->link_mask = 0;

	/* GPIE controls the PF interrupt block and is not in the VF BAR. */
	if (!sc->vf_ifp && hw->mac.type != e1000_82575)
		E1000_WRITE_REG(hw, E1000_GPIE,
		    E1000_GPIE_MSIX_MODE | E1000_GPIE_EIAME |
		    E1000_GPIE_PBA | E1000_GPIE_NSICR);

	/* Turn on MSI-X */
	switch (hw->mac.type) {
	case e1000_82580:
	case e1000_i350:
	case e1000_i354:
	case e1000_i210:
	case e1000_i211:
	case e1000_vfadapt:
	case e1000_vfadapt_i350:
		/* RX entries */
		for (int i = 0; i < sc->rx_num_queues; i++) {
			uint32_t index, qid;

			rx_que = &sc->rx_queues[i];
			qid = rx_que->rxr.me;
			index = qid >> 1;
			ivar = E1000_READ_REG_ARRAY(hw, E1000_IVAR0, index);
			if (qid & 1) {
				ivar &= 0xFF00FFFF;
				ivar |= (rx_que->msix | E1000_IVAR_VALID) <<
				    16;
			} else {
				ivar &= 0xFFFFFF00;
				ivar |= rx_que->msix | E1000_IVAR_VALID;
			}
			E1000_WRITE_REG_ARRAY(hw, E1000_IVAR0, index, ivar);
			sc->que_mask |= rx_que->eims;
		}
		/* TX entries */
		for (int i = 0; i < sc->tx_num_queues; i++) {
			uint32_t index, qid;

			tx_que = &sc->tx_queues[i];
			qid = tx_que->txr.me;
			index = qid >> 1;
			ivar = E1000_READ_REG_ARRAY(hw, E1000_IVAR0, index);
			if (qid & 1) {
				ivar &= 0x00FFFFFF;
				ivar |= (tx_que->msix | E1000_IVAR_VALID) <<
				    24;
			} else {
				ivar &= 0xFFFF00FF;
				ivar |= (tx_que->msix | E1000_IVAR_VALID) <<
				    8;
			}
			E1000_WRITE_REG_ARRAY(hw, E1000_IVAR0, index, ivar);
			sc->que_mask |= tx_que->eims;
		}

		/* And for the link interrupt */
		if (sc->vf_ifp) {
			/*
			 * VTIVAR_MISC maps the VF mailbox in bits 7:0.
			 * The PF IVAR_MISC maps other causes in bits 15:8.
			 */
			ivar = sc->linkvec | E1000_IVAR_VALID;
		} else
			ivar = (sc->linkvec | E1000_IVAR_VALID) << 8;
		sc->link_mask = 1 << sc->linkvec;
		E1000_WRITE_REG(hw, E1000_IVAR_MISC, ivar);
		break;
	case e1000_82576:
		/* RX entries */
		for (int i = 0; i < sc->rx_num_queues; i++) {
			uint32_t index, qid;

			rx_que = &sc->rx_queues[i];
			qid = rx_que->rxr.me;
			index = qid & 0x7; /* Each IVAR has two entries */
			ivar = E1000_READ_REG_ARRAY(hw, E1000_IVAR0, index);
			if (qid < 8) {
				ivar &= 0xFFFFFF00;
				ivar |= rx_que->msix | E1000_IVAR_VALID;
			} else {
				ivar &= 0xFF00FFFF;
				ivar |= (rx_que->msix | E1000_IVAR_VALID) <<
				    16;
			}
			E1000_WRITE_REG_ARRAY(hw, E1000_IVAR0, index, ivar);
			sc->que_mask |= rx_que->eims;
		}
		/* TX entries */
		for (int i = 0; i < sc->tx_num_queues; i++) {
			uint32_t index, qid;

			tx_que = &sc->tx_queues[i];
			qid = tx_que->txr.me;
			index = qid & 0x7; /* Each IVAR has two entries */
			ivar = E1000_READ_REG_ARRAY(hw, E1000_IVAR0, index);
			if (qid < 8) {
				ivar &= 0xFFFF00FF;
				ivar |= (tx_que->msix | E1000_IVAR_VALID) <<
				    8;
			} else {
				ivar &= 0x00FFFFFF;
				ivar |= (tx_que->msix | E1000_IVAR_VALID) <<
				    24;
			}
			E1000_WRITE_REG_ARRAY(hw, E1000_IVAR0, index, ivar);
			sc->que_mask |= tx_que->eims;
		}

		/* And for the link interrupt */
		ivar = (sc->linkvec | E1000_IVAR_VALID) << 8;
		sc->link_mask = 1 << sc->linkvec;
		E1000_WRITE_REG(hw, E1000_IVAR_MISC, ivar);
		break;

	case e1000_82575:
		/* enable MSI-X support*/
		tmp = E1000_READ_REG(hw, E1000_CTRL_EXT);
		tmp |= E1000_CTRL_EXT_PBA_CLR;
		/* Auto-Mask interrupts upon ICR read. */
		tmp |= E1000_CTRL_EXT_EIAME;
		tmp |= E1000_CTRL_EXT_IRCA;
		E1000_WRITE_REG(hw, E1000_CTRL_EXT, tmp);

		/* Queues */
		for (int i = 0; i < sc->rx_num_queues; i++) {
			rx_que = &sc->rx_queues[i];
			tmp = E1000_EICR_RX_QUEUE0 << i;
			tmp |= E1000_EICR_TX_QUEUE0 << i;
			rx_que->eims = tmp;
			E1000_WRITE_REG_ARRAY(hw, E1000_MSIXBM(0), i,
			    rx_que->eims);
			sc->que_mask |= rx_que->eims;
		}

		/* Link */
		E1000_WRITE_REG(hw, E1000_MSIXBM(sc->linkvec),
		    E1000_EIMS_OTHER);
		sc->link_mask |= E1000_EIMS_OTHER;
	default:
		break;
	}

	return;
}

static void
igb_initialize_interrupt_rate(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	struct em_rx_queue *rx_que;
	u32 newitr;

	newitr = IGB_INTS_TO_EITR(em_max_interrupt_rate);
	if (hw->mac.type == e1000_82575)
		newitr |= newitr << 16;
	else
		newitr |= E1000_EITR_CNT_IGNR;

	for (int i = 0; i < sc->rx_num_queues; i++) {
		rx_que = &sc->rx_queues[i];
		rx_que->itr_setting = newitr;
		E1000_WRITE_REG(hw, E1000_EITR(rx_que->msix),
		    rx_que->itr_setting);
	}
	if (sc->intr_type == IFLIB_INTR_MSIX)
		E1000_WRITE_REG(hw, E1000_EITR(sc->linkvec), newitr);
}

static void
em_free_pci_resources(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct em_rx_queue *que = sc->rx_queues;
	device_t dev = iflib_get_dev(ctx);

	/* Release all MSI-X queue resources */
	if (sc->intr_type == IFLIB_INTR_MSIX)
		iflib_irq_free(ctx, &sc->irq);

	if (que != NULL) {
		for (int i = 0; i < sc->rx_num_queues; i++, que++) {
			iflib_irq_free(ctx, &que->que_irq);
		}
	}

	if (sc->memory != NULL) {
		bus_release_resource(dev, SYS_RES_MEMORY,
		    rman_get_rid(sc->memory), sc->memory);
		sc->memory = NULL;
	}

	if (sc->flash != NULL) {
		bus_release_resource(dev, SYS_RES_MEMORY,
		    rman_get_rid(sc->flash), sc->flash);
		sc->flash = NULL;
	}

	if (sc->ioport != NULL) {
		bus_release_resource(dev, SYS_RES_IOPORT,
		    rman_get_rid(sc->ioport), sc->ioport);
		sc->ioport = NULL;
	}
}

/* Set up MSI or MSI-X */
static int
em_setup_msix(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);

	if (sc->hw.mac.type == e1000_82574) {
		em_enable_vectors_82574(ctx);
	}
	return (0);
}

/*********************************************************************
 *
 *  Workaround for SmartSpeed on 82541 and 82547 controllers
 *
 **********************************************************************/
static void
lem_smartspeed(struct e1000_softc *sc)
{
	u16 phy_tmp;

	if (sc->link_state == EM_LINK_STATE_UP ||
	    sc->link_state == EM_LINK_STATE_UP_RESET_PENDING ||
	    (sc->hw.phy.type != e1000_phy_igp) ||
	    sc->hw.mac.autoneg == 0 ||
	    (sc->hw.phy.autoneg_advertised & ADVERTISE_1000_FULL) == 0)
		return;

	if (sc->smartspeed == 0) {
		/* If Master/Slave config fault is asserted twice,
		 * we assume back-to-back */
		e1000_read_phy_reg(&sc->hw, PHY_1000T_STATUS, &phy_tmp);
		if (!(phy_tmp & SR_1000T_MS_CONFIG_FAULT))
			return;
		e1000_read_phy_reg(&sc->hw, PHY_1000T_STATUS, &phy_tmp);
		if (phy_tmp & SR_1000T_MS_CONFIG_FAULT) {
			e1000_read_phy_reg(&sc->hw,
			    PHY_1000T_CTRL, &phy_tmp);
			if(phy_tmp & CR_1000T_MS_ENABLE) {
				phy_tmp &= ~CR_1000T_MS_ENABLE;
				e1000_write_phy_reg(&sc->hw,
				    PHY_1000T_CTRL, phy_tmp);
				sc->smartspeed++;
				if(sc->hw.mac.autoneg &&
				   !e1000_copper_link_autoneg(&sc->hw) &&
				   !e1000_read_phy_reg(&sc->hw,
				    PHY_CONTROL, &phy_tmp)) {
					phy_tmp |= (MII_CR_AUTO_NEG_EN |
						    MII_CR_RESTART_AUTO_NEG);
					e1000_write_phy_reg(&sc->hw,
					    PHY_CONTROL, phy_tmp);
				}
			}
		}
		return;
	} else if(sc->smartspeed == EM_SMARTSPEED_DOWNSHIFT) {
		/* If still no link, perhaps using 2/3 pair cable */
		e1000_read_phy_reg(&sc->hw, PHY_1000T_CTRL, &phy_tmp);
		phy_tmp |= CR_1000T_MS_ENABLE;
		e1000_write_phy_reg(&sc->hw, PHY_1000T_CTRL, phy_tmp);
		if(sc->hw.mac.autoneg &&
		   !e1000_copper_link_autoneg(&sc->hw) &&
		   !e1000_read_phy_reg(&sc->hw, PHY_CONTROL, &phy_tmp)) {
			phy_tmp |= (MII_CR_AUTO_NEG_EN |
				    MII_CR_RESTART_AUTO_NEG);
			e1000_write_phy_reg(&sc->hw, PHY_CONTROL, phy_tmp);
		}
	}
	/* Restart process after EM_SMARTSPEED_MAX iterations */
	if(sc->smartspeed++ == EM_SMARTSPEED_MAX)
		sc->smartspeed = 0;
}

static void
igb_disable_dmac(struct e1000_hw *hw)
{
	u32 reg;

	reg = E1000_READ_REG(hw, E1000_DMACR);
	reg &= ~E1000_DMACR_DMAC_EN;
	/* Retain the documented Lx policy and I210 reserved encoding. */
	reg |= E1000_DMACR_DMAC_LX_MASK;
	E1000_WRITE_REG(hw, E1000_DMACR, reg);
}

/*********************************************************************
 *
 *  Initialize the DMA Coalescing feature
 *
 **********************************************************************/
static void
igb_init_dmac(struct e1000_softc *sc, u32 pba)
{
	device_t	dev = sc->dev;
	struct e1000_hw *hw = &sc->hw;
	u32		dmac, dmacwt, reg, ttlx;
	u16		hwm;
	u16		max_frame_size;

	KASSERT(!sc->vf_ifp, ("%s: DMA coalescing requested for a VF",
	    __func__));

	if (hw->mac.type == e1000_i211)
		return;

	/*
	 * I350 DMA coalescing and SR-IOV are mutually exclusive.  Preserve
	 * the configured value so it can be restored after IOV is disabled.
	 */
	if (igb_iov_enabled(sc)) {
		if (hw->mac.type > e1000_82580)
			igb_disable_dmac(hw);
		return;
	}

	max_frame_size = sc->shared->isc_max_frame_size;
	if (hw->mac.type > e1000_82580) {

		if (sc->dmac == 0) { /* Disabling it */
			igb_disable_dmac(hw);
			return;
		} else
			device_printf(dev, "DMA Coalescing enabled\n");

		/* Set starting threshold */
		E1000_WRITE_REG(hw, E1000_DMCTXTH, 0);

		hwm = 64 * pba - max_frame_size / 16;
		if (hwm < 64 * (pba - 6))
			hwm = 64 * (pba - 6);
		reg = E1000_READ_REG(hw, E1000_FCRTC);
		reg &= ~E1000_FCRTC_RTH_COAL_MASK;
		reg |= ((hwm << E1000_FCRTC_RTH_COAL_SHIFT)
		    & E1000_FCRTC_RTH_COAL_MASK);
		E1000_WRITE_REG(hw, E1000_FCRTC, reg);


		dmac = pba - max_frame_size / 512;
		if (dmac < pba - 10)
			dmac = pba - 10;
		reg = E1000_READ_REG(hw, E1000_DMACR);
		reg &= ~(E1000_DMACR_DMACWT_MASK |
		    E1000_DMACR_DMACTHR_MASK | E1000_DMACR_DMAC_LX_MASK |
		    E1000_DMACR_DMAC_EN | E1000_DMACR_DC_LPBKW_EN |
		    E1000_DMACR_DC_BMC2OSW_EN);
		reg |= ((dmac << E1000_DMACR_DMACTHR_SHIFT)
		    & E1000_DMACR_DMACTHR_MASK);

		/* Transition to L0s or L1 if available. */
		reg |= (E1000_DMACR_DMAC_EN | E1000_DMACR_DMAC_LX_MASK);

		/*
		 * The watchdog uses 12.8 usec units on an I354 2.5 Gb/s
		 * backplane connection and 32 usec units otherwise.
		 */
		if (hw->mac.type == e1000_i354) {
			int status = E1000_READ_REG(hw, E1000_STATUS);
			if ((status & E1000_STATUS_2P5_SKU) &&
			    (!(status & E1000_STATUS_2P5_SKU_OVER)))
				dmacwt = (sc->dmac * 5) >> 6;
			else
				dmacwt = sc->dmac >> 5;
		} else {
			dmacwt = sc->dmac >> 5;
		}
		reg |= dmacwt & E1000_DMACR_DMACWT_MASK;
		if (hw->mac.type == e1000_i350 ||
		    hw->mac.type == e1000_i354)
			reg |= E1000_DMACR_DC_LPBKW_EN;
		if (hw->mac.type == e1000_i354)
			reg |= E1000_DMACR_DC_BMC2OSW_EN;

		E1000_WRITE_REG(hw, E1000_DMACR, reg);

		E1000_WRITE_REG(hw, E1000_DMCRTRH, 0);

		/* Set the interval before transition. */
		reg = E1000_READ_REG(hw, E1000_DMCTLX);
		reg &= ~E1000_DMCTLX_TTLX_MASK;
		if (hw->mac.type == e1000_i350)
			reg |= IGB_DMCTLX_DCFLUSH_DIS;
		/*
		 * I210 documents TTLX as reserved with a required value of 0x20.
		 * At 2.5 Gb/s the I354 unit is 0.4 usec, so ten ticks retain
		 * the four usec interval used at other speeds.
		 */
		if (hw->mac.type == e1000_i210) {
			ttlx = 0x20;
		} else if (hw->mac.type == e1000_i354) {
			int status = E1000_READ_REG(hw, E1000_STATUS);
			if ((status & E1000_STATUS_2P5_SKU) &&
			    (!(status & E1000_STATUS_2P5_SKU_OVER)))
				ttlx = 0xA;
			else
				ttlx = 0x4;
		} else {
			ttlx = 0x4;
		}
		reg |= ttlx & E1000_DMCTLX_TTLX_MASK;

		E1000_WRITE_REG(hw, E1000_DMCTLX, reg);

		/* free space in tx packet buffer to wake from DMA coal */
		E1000_WRITE_REG(hw, E1000_DMCTXTH, (IGB_TXPBSIZE -
		    (2 * max_frame_size)) >> 6);

		/* make low power state decision controlled by DMA coal */
		reg = E1000_READ_REG(hw, E1000_PCIEMISC);
		reg |= E1000_PCIEMISC_LX_DECISION;
		E1000_WRITE_REG(hw, E1000_PCIEMISC, reg);

	} else if (hw->mac.type == e1000_82580) {
		u32 reg = E1000_READ_REG(hw, E1000_PCIEMISC);
		E1000_WRITE_REG(hw, E1000_PCIEMISC,
		    reg & ~E1000_PCIEMISC_LX_DECISION);
		E1000_WRITE_REG(hw, E1000_DMACR, 0);
	}
}
/*********************************************************************
 * The 3 following flush routines are used as a workaround in the
 * I219 client parts and only for them.
 *
 * em_flush_tx_ring - remove all descriptors from the tx_ring
 *
 * We want to clear all pending descriptors from the TX ring.
 * zeroing happens when the HW reads the regs. We assign the ring itself as
 * the data of the next descriptor. We don't care about the data we are about
 * to reset the HW.
 **********************************************************************/
static void
em_flush_tx_ring(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	struct tx_ring *txr = &sc->tx_queues->txr;
	struct e1000_tx_desc *txd;
	u32 tctl, txd_lower = E1000_TXD_CMD_IFCS;
	u16 size = 512;

	tctl = E1000_READ_REG(hw, E1000_TCTL);
	E1000_WRITE_REG(hw, E1000_TCTL, tctl | E1000_TCTL_EN);

	txd = &txr->tx_base[txr->tx_cidx_processed];

	/* Just use the ring as a dummy buffer addr */
	txd->buffer_addr = txr->tx_paddr;
	txd->lower.data = htole32(txd_lower | size);
	txd->upper.data = 0;

	/* flush descriptors to memory before notifying the HW */
	wmb();

	E1000_WRITE_REG(hw, E1000_TDT(0), txr->tx_cidx_processed);
	mb();
	usec_delay(250);
}

/*********************************************************************
 * em_flush_rx_ring - remove all descriptors from the rx_ring
 *
 * Mark all descriptors in the RX ring as consumed and disable the rx ring
 **********************************************************************/
static void
em_flush_rx_ring(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	u32 rctl, rxdctl;

	rctl = E1000_READ_REG(hw, E1000_RCTL);
	E1000_WRITE_REG(hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);
	E1000_WRITE_FLUSH(hw);
	usec_delay(150);

	rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(0));
	/* zero the lower 14 bits (prefetch and host thresholds) */
	rxdctl &= 0xffffc000;
	/*
	 * update thresholds: prefetch threshold to 31, host threshold to 1
	 * and make sure the granularity is "descriptors" and not
	 * "cache lines"
	 */
	rxdctl |= (0x1F | (1 << 8) | E1000_RXDCTL_THRESH_UNIT_DESC);
	E1000_WRITE_REG(hw, E1000_RXDCTL(0), rxdctl);

	/* momentarily enable the RX ring for the changes to take effect */
	E1000_WRITE_REG(hw, E1000_RCTL, rctl | E1000_RCTL_EN);
	E1000_WRITE_FLUSH(hw);
	usec_delay(150);
	E1000_WRITE_REG(hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);
}

/*********************************************************************
 * em_flush_desc_rings - remove all descriptors from the descriptor rings
 *
 * In I219, the descriptor rings must be emptied before resetting the HW
 * or before changing the device state to D3 during runtime (runtime PM).
 *
 * Failure to do this will cause the HW to enter a unit hang state which can
 * only be released by PCI reset on the device
 *
 **********************************************************************/
static void
em_flush_desc_rings(struct e1000_softc *sc)
{
	struct e1000_hw	*hw = &sc->hw;
	device_t dev = sc->dev;
	u16 hang_state;
	u32 fext_nvm11, tdlen;

	/* First, disable MULR fix in FEXTNVM11 */
	fext_nvm11 = E1000_READ_REG(hw, E1000_FEXTNVM11);
	fext_nvm11 |= E1000_FEXTNVM11_DISABLE_MULR_FIX;
	E1000_WRITE_REG(hw, E1000_FEXTNVM11, fext_nvm11);

	/* do nothing if we're not in faulty state, or the queue is empty */
	tdlen = E1000_READ_REG(hw, E1000_TDLEN(0));
	hang_state = pci_read_config(dev, PCICFG_DESC_RING_STATUS, 2);
	if (!(hang_state & FLUSH_DESC_REQUIRED) || !tdlen)
		return;
	em_flush_tx_ring(sc);

	/* recheck, maybe the fault is caused by the rx ring */
	hang_state = pci_read_config(dev, PCICFG_DESC_RING_STATUS, 2);
	if (hang_state & FLUSH_DESC_REQUIRED)
		em_flush_rx_ring(sc);
}


/*********************************************************************
 *
 *  Initialize the hardware to a configuration as specified by the
 *  sc structure.
 *
 **********************************************************************/
static int
em_reset(if_ctx_t ctx)
{
	device_t dev = iflib_get_dev(ctx);
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_t ifp = iflib_get_ifp(ctx);
	struct e1000_hw *hw = &sc->hw;
	u32 rx_buffer_size;
	u32 pba;
	s32 error;

	INIT_DEBUGOUT("em_reset: begin");
	KASSERT(!sc->vf_ifp, ("%s called for a VF", __func__));

	/* Let the firmware know the OS is in control */
	em_get_hw_control(sc);

	/* Set up smart power down as default off on newer adapters. */
	if (!em_smart_pwr_down && (hw->mac.type == e1000_82571 ||
	    hw->mac.type == e1000_82572)) {
		u16 phy_tmp = 0;

		/* Speed up time to link by disabling smart power down. */
		e1000_read_phy_reg(hw, IGP02E1000_PHY_POWER_MGMT, &phy_tmp);
		phy_tmp &= ~IGP02E1000_PM_SPD;
		e1000_write_phy_reg(hw, IGP02E1000_PHY_POWER_MGMT, phy_tmp);
	}

	/*
	 * Packet Buffer Allocation (PBA)
	 * Writing PBA sets the receive portion of the buffer
	 * the remainder is used for the transmit buffer.
	 */
	switch (hw->mac.type) {
	/* 82547: Total Packet Buffer is 40K */
	case e1000_82547:
	case e1000_82547_rev_2:
		if (hw->mac.max_frame_size > 8192)
			pba = E1000_PBA_22K; /* 22K for Rx, 18K for Tx */
		else
			pba = E1000_PBA_30K; /* 30K for Rx, 10K for Tx */
		break;
	/* 82571/82572/80003es2lan: Total Packet Buffer is 48K */
	case e1000_82571:
	case e1000_82572:
	case e1000_80003es2lan:
			pba = E1000_PBA_32K; /* 32K for Rx, 16K for Tx */
		break;
	/* 82573: Total Packet Buffer is 32K */
	case e1000_82573:
			pba = E1000_PBA_12K; /* 12K for Rx, 20K for Tx */
		break;
	/* 82574/82583: Total Packet Buffer is 40K */
	case e1000_82574:
	case e1000_82583:
		if (hw->mac.max_frame_size > 8192)
			pba = E1000_PBA_22K; /* 22K for Rx, 18K for Tx */
		else
			pba = E1000_PBA_32K; /* 32K for RX, 8K for Tx */
		break;
	case e1000_ich8lan:
		pba = E1000_PBA_8K;
		break;
	case e1000_ich9lan:
	case e1000_ich10lan:
		/* Boost Receive side for jumbo frames */
		if (hw->mac.max_frame_size > 4096)
			pba = E1000_PBA_14K;
		else
			pba = E1000_PBA_10K;
		break;
	case e1000_pchlan:
	case e1000_pch2lan:
	case e1000_pch_lpt:
	case e1000_pch_spt:
	case e1000_pch_cnp:
	case e1000_pch_tgp:
	case e1000_pch_adp:
	case e1000_pch_mtp:
	case e1000_pch_ptp:
	case e1000_pch_nvp:
		pba = E1000_PBA_26K;
		break;
	case e1000_82575:
		pba = E1000_PBA_32K;
		break;
	case e1000_82576:
		pba = E1000_READ_REG(hw, E1000_RXPBS);
		pba &= E1000_RXPBS_SIZE_MASK_82576;
		break;
	case e1000_82580:
	case e1000_i350:
	case e1000_i354:
		pba = E1000_READ_REG(hw, E1000_RXPBS);
		pba = e1000_rxpbs_adjust_82580(pba);
		break;
	case e1000_i210:
	case e1000_i211:
		pba = E1000_PBA_34K;
		break;
	default:
		/* Remaining devices assumed to have Packet Buffer of 64K. */
		if (hw->mac.max_frame_size > 8192)
			pba = E1000_PBA_40K; /* 40K for Rx, 24K for Tx */
		else
			pba = E1000_PBA_48K; /* 48K for Rx, 16K for Tx */
	}

	/* Special needs in case of Jumbo frames */
	if ((hw->mac.type == e1000_82575) && (if_getmtu(ifp) > ETHERMTU)) {
		u32 tx_space, min_tx, min_rx;
		pba = E1000_READ_REG(hw, E1000_PBA);
		tx_space = pba >> 16;
		pba &= 0xffff;
		min_tx = (hw->mac.max_frame_size +
		    sizeof(struct e1000_tx_desc) - ETHERNET_FCS_SIZE) * 2;
		min_tx = roundup2(min_tx, 1024);
		min_tx >>= 10;
		min_rx = hw->mac.max_frame_size;
		min_rx = roundup2(min_rx, 1024);
		min_rx >>= 10;
		if (tx_space < min_tx &&
		    ((min_tx - tx_space) < pba)) {
			pba = pba - (min_tx - tx_space);
			/*
			 * if short on rx space, rx wins
			 * and must trump tx adjustment
			 */
			if (pba < min_rx)
				pba = min_rx;
		}
		E1000_WRITE_REG(hw, E1000_PBA, pba);
	}

	if (hw->mac.type < igb_mac_min)
		E1000_WRITE_REG(hw, E1000_PBA, pba);

	INIT_DEBUGOUT1("em_reset: pba=%dK", pba);

	/*
	 * These parameters control the automatic generation (Tx) and
	 * response (Rx) to Ethernet PAUSE frames.
	 * - High water mark should allow for at least two frames to be
	 *   received after sending an XOFF.
	 * - Low water mark works best when it is very near the high water
	     mark.
	 *   This allows the receiver to restart by sending XON when it has
	 *   drained a bit. Here we use an arbitrary value of 1500 which will
	 *   restart after one full frame is pulled from the buffer. There
	 *   could be several smaller frames in the buffer and if so they will
	 *   not trigger the XON until their total number reduces the buffer
	 *   by 1500.
	 * - The pause time is fairly large at 1000 x 512ns = 512 usec.
	 */
	rx_buffer_size = (pba & 0xffff) << 10;
	hw->fc.high_water = rx_buffer_size -
	    roundup2(hw->mac.max_frame_size, 1024);
	hw->fc.low_water = hw->fc.high_water - 1500;

	if (sc->fc) /* locally set flow control value? */
		hw->fc.requested_mode = sc->fc;
	else
		hw->fc.requested_mode = e1000_fc_full;

	if (hw->mac.type == e1000_80003es2lan)
		hw->fc.pause_time = 0xFFFF;
	else
		hw->fc.pause_time = EM_FC_PAUSE_TIME;

	hw->fc.send_xon = true;

	/* Device specific overrides/settings */
	switch (hw->mac.type) {
	case e1000_pchlan:
		/* Workaround: no TX flow ctrl for PCH */
		hw->fc.requested_mode = e1000_fc_rx_pause;
		hw->fc.pause_time = 0xFFFF; /* override */
		if (if_getmtu(ifp) > ETHERMTU) {
			hw->fc.high_water = 0x3500;
			hw->fc.low_water = 0x1500;
		} else {
			hw->fc.high_water = 0x5000;
			hw->fc.low_water = 0x3000;
		}
		hw->fc.refresh_time = 0x1000;
		break;
	case e1000_pch2lan:
	case e1000_pch_lpt:
	case e1000_pch_spt:
	case e1000_pch_cnp:
	case e1000_pch_tgp:
	case e1000_pch_adp:
	case e1000_pch_mtp:
	case e1000_pch_ptp:
	case e1000_pch_nvp:
		hw->fc.high_water = 0x5C20;
		hw->fc.low_water = 0x5048;
		hw->fc.pause_time = 0xFFFF;
		hw->fc.refresh_time = 0xFFFF;
		/* Jumbos need adjusted PBA */
		if (if_getmtu(ifp) > ETHERMTU)
			pba = E1000_PBA_12K;
		else
			pba = E1000_PBA_26K;
		E1000_WRITE_REG(hw, E1000_PBA, pba);
		break;
	case e1000_82575:
	case e1000_82576:
		/* 8-byte granularity */
		hw->fc.low_water = hw->fc.high_water - 8;
		break;
	case e1000_82580:
	case e1000_i350:
	case e1000_i354:
	case e1000_i210:
	case e1000_i211:
		/* 16-byte granularity */
		hw->fc.low_water = hw->fc.high_water - 16;
		break;
	case e1000_ich9lan:
	case e1000_ich10lan:
		if (if_getmtu(ifp) > ETHERMTU) {
			hw->fc.high_water = 0x2800;
			hw->fc.low_water = hw->fc.high_water - 8;
			break;
		}
		/* FALLTHROUGH */
	default:
		if (hw->mac.type == e1000_80003es2lan)
			hw->fc.pause_time = 0xFFFF;
		break;
	}

	/* I219 needs some special flushing to avoid hangs */
	if (sc->hw.mac.type >= e1000_pch_spt && sc->hw.mac.type < igb_mac_min)
		em_flush_desc_rings(sc);

	/* Issue a global reset */
	em_prepare_fatal_error_reset(sc);
	error = e1000_reset_hw(hw);
	if (error != E1000_SUCCESS) {
		device_printf(dev, "Hardware reset failed: %d\n", error);
		return (error);
	}
	if (hw->mac.type >= igb_mac_min) {
		E1000_WRITE_REG(hw, E1000_WUC, 0);
	} else {
		E1000_WRITE_REG(hw, E1000_WUFC, 0);
		em_disable_aspm(sc);
	}
	if (sc->flags & IGB_MEDIA_RESET) {
		e1000_setup_init_funcs(hw, true);
		e1000_get_bus_info(hw);
		sc->flags &= ~IGB_MEDIA_RESET;
	}
	/* and a re-init */
	error = e1000_init_hw(hw);
	if (error != E1000_SUCCESS) {
		device_printf(dev, "Hardware initialization failed: %d\n",
		    error);
		return (error);
	}
	em_configure_82576_memory_errors(sc);
	em_finish_fatal_error_reset(sc);
	if (hw->mac.type >= igb_mac_min)
		igb_init_dmac(sc, pba);

	/* Save the receive packet-buffer allocation for AIM. */
	sc->pba = pba;

	E1000_WRITE_REG(hw, E1000_VET, ETHERTYPE_VLAN);
	e1000_get_phy_info(hw);
	e1000_check_for_link(hw);
	sc->phy_hang_count = 0;

	return (E1000_SUCCESS);
}

/*
 * Initialise the RSS mapping for NICs that support multiple transmit/
 * receive rings.
 */

#define RSSKEYLEN 10
static void
em_initialize_rss_mapping(struct e1000_softc *sc)
{
	uint8_t rss_key[4 * RSSKEYLEN];
	uint32_t reta = 0;
	struct e1000_hw *hw = &sc->hw;
	int i;

	/*
	 * Configure RSS key
	 */
	arc4rand(rss_key, sizeof(rss_key), 0);
	for (i = 0; i < RSSKEYLEN; ++i) {
		uint32_t rssrk = 0;

		rssrk = EM_RSSRK_VAL(rss_key, i);
		E1000_WRITE_REG(hw,E1000_RSSRK(i), rssrk);
	}

	/*
	 * Configure RSS redirect table in following fashion:
	 * (hash & ring_cnt_mask) == rdr_table[(hash & rdr_table_mask)]
	 */
	for (i = 0; i < sizeof(reta); ++i) {
		uint32_t q;

		q = (i % sc->rx_num_queues) << 7;
		reta |= q << (8 * i);
	}

	for (i = 0; i < 32; ++i)
		E1000_WRITE_REG(hw, E1000_RETA(i), reta);

	E1000_WRITE_REG(hw, E1000_MRQC, E1000_MRQC_RSS_ENABLE_2Q |
			E1000_MRQC_RSS_FIELD_IPV4_TCP |
			E1000_MRQC_RSS_FIELD_IPV4 |
			E1000_MRQC_RSS_FIELD_IPV6_TCP_EX |
			E1000_MRQC_RSS_FIELD_IPV6_EX |
			E1000_MRQC_RSS_FIELD_IPV6);
}

static void
igb_initialize_rss_mapping(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	int i;
	int queue_id;
	u32 reta;
	u32 rss_key[10], mrqc, shift = 0;

	/* XXX? */
	if (hw->mac.type == e1000_82575)
		shift = 6;

	/*
	 * The redirection table controls which destination
	 * queue each bucket redirects traffic to.
	 * Each DWORD represents four queues, with the LSB
	 * being the first queue in the DWORD.
	 *
	 * This just allocates buckets to queues using round-robin
	 * allocation.
	 *
	 * NOTE: It Just Happens to line up with the default
	 * RSS allocation method.
	 */

	/* Warning FM follows */
	reta = 0;
	for (i = 0; i < 128; i++) {
#ifdef RSS
		queue_id = rss_get_indirection_to_bucket(i);
		/*
		 * If we have more queues than buckets, we'll
		 * end up mapping buckets to a subset of the
		 * queues.
		 *
		 * If we have more buckets than queues, we'll
		 * end up instead assigning multiple buckets
		 * to queues.
		 *
		 * Both are suboptimal, but we need to handle
		 * the case so we don't go out of bounds
		 * indexing arrays and such.
		 */
		queue_id = queue_id % sc->rx_num_queues;
#else
		queue_id = (i % sc->rx_num_queues);
#endif
		/* Adjust if required */
		queue_id = queue_id << shift;

		/*
		 * The low 8 bits are for hash value (n+0);
		 * The next 8 bits are for hash value (n+1), etc.
		 */
		reta = reta >> 8;
		reta = reta | ( ((uint32_t) queue_id) << 24);
		if ((i & 3) == 3) {
			E1000_WRITE_REG(hw, E1000_RETA(i >> 2), reta);
			reta = 0;
		}
	}

	/* Now fill in hash table */

	/*
	 * MRQC: Multiple Receive Queues Command
	 * Set queuing to RSS control, number depends on the device.
	 */
	mrqc = E1000_MRQC_ENABLE_RSS_MQ;

	/* XXX ew typecasting */
	rss_getkey((uint8_t *) &rss_key);
	for (i = 0; i < 10; i++)
		E1000_WRITE_REG_ARRAY(hw, E1000_RSSRK(0), i, rss_key[i]);

	/*
	 * Configure the RSS fields to hash upon.
	 */
	mrqc |= (E1000_MRQC_RSS_FIELD_IPV4 |
	    E1000_MRQC_RSS_FIELD_IPV4_TCP);
	mrqc |= (E1000_MRQC_RSS_FIELD_IPV6 |
	    E1000_MRQC_RSS_FIELD_IPV6_TCP);
	mrqc |=( E1000_MRQC_RSS_FIELD_IPV4_UDP |
	    E1000_MRQC_RSS_FIELD_IPV6_UDP);
	mrqc |=( E1000_MRQC_RSS_FIELD_IPV6_UDP_EX |
	    E1000_MRQC_RSS_FIELD_IPV6_TCP_EX);

	E1000_WRITE_REG(hw, E1000_MRQC, mrqc);
}

/*********************************************************************
 *
 *  Setup networking device structure and register interface media.
 *
 **********************************************************************/
static int
em_setup_interface(if_ctx_t ctx)
{
	if_t ifp = iflib_get_ifp(ctx);
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = sc->shared;

	INIT_DEBUGOUT("em_setup_interface: begin");

	/* Single Queue */
	if (sc->tx_num_queues == 1) {
		if_setsendqlen(ifp, scctx->isc_ntxd[0] - 1);
		if_setsendqready(ifp);
	}

	/*
	 * Specify the media types supported by this adapter and register
	 * callbacks to update media and link information
	 */
	if (sc->vf_ifp) {
		ifmedia_add(sc->media,
		    IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
		ifmedia_set(sc->media,
		    IFM_ETHER | IFM_1000_T | IFM_FDX);
		return (0);
	}

	if (sc->hw.phy.media_type == e1000_media_type_fiber ||
	    sc->hw.phy.media_type == e1000_media_type_internal_serdes) {
		u_char fiber_type = IFM_1000_SX;	/* default type */

		if (sc->hw.mac.type == e1000_82545)
			fiber_type = IFM_1000_LX;
		ifmedia_add(sc->media,
		    IFM_ETHER | fiber_type | IFM_FDX, 0, NULL);
		ifmedia_add(sc->media, IFM_ETHER | fiber_type, 0, NULL);
	} else {
		ifmedia_add(sc->media, IFM_ETHER | IFM_10_T, 0, NULL);
		ifmedia_add(sc->media,
		    IFM_ETHER | IFM_10_T | IFM_FDX, 0, NULL);
		ifmedia_add(sc->media, IFM_ETHER | IFM_100_TX, 0, NULL);
		ifmedia_add(sc->media,
		    IFM_ETHER | IFM_100_TX | IFM_FDX, 0, NULL);
		if (sc->hw.phy.type != e1000_phy_ife) {
			ifmedia_add(sc->media,
			    IFM_ETHER | IFM_1000_T | IFM_FDX, 0, NULL);
			ifmedia_add(sc->media,
			    IFM_ETHER | IFM_1000_T, 0, NULL);
		}
	}
	ifmedia_add(sc->media, IFM_ETHER | IFM_AUTO, 0, NULL);
	ifmedia_set(sc->media, IFM_ETHER | IFM_AUTO);
	return (0);
}

static int
em_if_tx_queues_alloc(if_ctx_t ctx, caddr_t *vaddrs, uint64_t *paddrs,
    int ntxqs, int ntxqsets)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = sc->shared;
	int error = E1000_SUCCESS;
	struct em_tx_queue *que;
	int i, j;

	MPASS(sc->tx_num_queues > 0);
	MPASS(sc->tx_num_queues == ntxqsets);

	/* First allocate the top level queue structs */
	if (!(sc->tx_queues =
	    (struct em_tx_queue *) malloc(sizeof(struct em_tx_queue) *
	    sc->tx_num_queues, M_DEVBUF, M_NOWAIT | M_ZERO))) {
		device_printf(iflib_get_dev(ctx),
		    "Unable to allocate queue memory\n");
		return(ENOMEM);
	}

	for (i = 0, que = sc->tx_queues; i < sc->tx_num_queues; i++, que++) {
		/* Set up some basics */

		struct tx_ring *txr = &que->txr;
		KASSERT(__is_aligned(&txr->tx_aim_snapshot, sizeof(uint64_t)),
		    ("%s: misaligned TX AIM snapshot %p", __func__,
		    &txr->tx_aim_snapshot));
		txr->sc = que->sc = sc;
		que->me = txr->me =  i;

		/* Allocate report status array */
		if (!(txr->tx_rsq =
		    (qidx_t *) malloc(sizeof(qidx_t) * scctx->isc_ntxd[0],
		    M_DEVBUF, M_NOWAIT | M_ZERO))) {
			device_printf(iflib_get_dev(ctx),
			    "failed to allocate rs_idxs memory\n");
			error = ENOMEM;
			goto fail;
		}
		for (j = 0; j < scctx->isc_ntxd[0]; j++)
			txr->tx_rsq[j] = QIDX_INVALID;
		/* get the virtual and physical address of hardware queues */
		txr->tx_base = (struct e1000_tx_desc *)vaddrs[i*ntxqs];
		txr->tx_paddr = paddrs[i*ntxqs];
	}

	if (bootverbose)
		device_printf(iflib_get_dev(ctx),
		    "allocated for %d tx_queues\n", sc->tx_num_queues);
	return (0);
fail:
	em_if_queues_free(ctx);
	return (error);
}

static int
em_if_rx_queues_alloc(if_ctx_t ctx, caddr_t *vaddrs, uint64_t *paddrs,
    int nrxqs, int nrxqsets)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	int error = E1000_SUCCESS;
	struct em_rx_queue *que;
	int i;

	MPASS(sc->rx_num_queues > 0);
	MPASS(sc->rx_num_queues == nrxqsets);

	/* First allocate the top level queue structs */
	if (!(sc->rx_queues =
	    (struct em_rx_queue *) malloc(sizeof(struct em_rx_queue) *
	    sc->rx_num_queues, M_DEVBUF, M_NOWAIT | M_ZERO))) {
		device_printf(iflib_get_dev(ctx),
		    "Unable to allocate queue memory\n");
		error = ENOMEM;
		goto fail;
	}

	for (i = 0, que = sc->rx_queues; i < nrxqsets; i++, que++) {
		/* Set up some basics */
		struct rx_ring *rxr = &que->rxr;
		KASSERT(__is_aligned(&rxr->rx_aim_snapshot, sizeof(uint64_t)),
		    ("%s: misaligned RX AIM snapshot %p", __func__,
		    &rxr->rx_aim_snapshot));
		rxr->sc = que->sc = sc;
		rxr->que = que;
		que->me = rxr->me =  i;

		/* get the virtual and physical address of hardware queues */
		rxr->rx_base =
		    (union e1000_rx_desc_extended *)vaddrs[i*nrxqs];
		rxr->rx_paddr = paddrs[i*nrxqs];
	}

	if (bootverbose)
		device_printf(iflib_get_dev(ctx),
		    "allocated for %d rx_queues\n", sc->rx_num_queues);

	return (0);
fail:
	em_if_queues_free(ctx);
	return (error);
}

static void
em_if_queues_free(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct em_tx_queue *tx_que = sc->tx_queues;
	struct em_rx_queue *rx_que = sc->rx_queues;

	if (tx_que != NULL) {
		for (int i = 0; i < sc->tx_num_queues; i++, tx_que++) {
			struct tx_ring *txr = &tx_que->txr;
			if (txr->tx_rsq == NULL)
				break;

			free(txr->tx_rsq, M_DEVBUF);
			txr->tx_rsq = NULL;
		}
		free(sc->tx_queues, M_DEVBUF);
		sc->tx_queues = NULL;
	}

	if (rx_que != NULL) {
		free(sc->rx_queues, M_DEVBUF);
		sc->rx_queues = NULL;
	}
}

static u32
em_legacy_txdctl(struct e1000_hw *hw)
{
	u32 txdctl;

	/*
	 * Start with the established full-descriptor writeback policy.
	 * Several generations have descriptor-queue errata for which it is
	 * a documented workaround.  The unsafe early controllers are
	 * overridden below.
	 */
	txdctl = EM_TX_PTHRESH | (EM_TX_HTHRESH << 8) |
	    (EM_TX_WTHRESH << 16) | E1000_TXDCTL_GRAN;

	switch (hw->mac.type) {
	case e1000_82571:
	case e1000_82572:
	case e1000_82573:
	case e1000_82574:
	case e1000_82583:
	case e1000_80003es2lan:
		/* Match the Intel shared-code policy for these families. */
		txdctl |= E1000_TXDCTL_COUNT_DESC;
		break;
	case e1000_ich8lan:
	case e1000_ich9lan:
	case e1000_ich10lan:
	case e1000_pchlan:
	case e1000_pch2lan:
	case e1000_pch_lpt:
	case e1000_pch_spt:
	case e1000_pch_cnp:
	case e1000_pch_tgp:
	case e1000_pch_adp:
	case e1000_pch_mtp:
	case e1000_pch_ptp:
	case e1000_pch_nvp:
		/* Preserve the required bit set by the integrated shared code. */
		txdctl |= (1U << 22);
		break;
	case e1000_82542:
	case e1000_82543:
	case e1000_82544:
		/*
		 * 82543 erratum 35 and 82544 erratum 20 require
		 * WTHRESH=0.  Leave all descriptor-control thresholds at
		 * their reset values on these early controllers.
		 */
		txdctl = 0;
		break;
	case e1000_82540:
	case e1000_82545:
	case e1000_82545_rev_3:
	case e1000_82546:
	case e1000_82546_rev_3:
	case e1000_82541:
	case e1000_82541_rev_2:
	case e1000_82547:
	case e1000_82547_rev_2:
		break;
	default:
		KASSERT(0, ("%s: unsupported MAC type %d", __func__,
		    hw->mac.type));
		break;
	}

	return (txdctl);
}

static u32
igb_txdctl(struct e1000_hw *hw)
{
	u32 pthresh;

	switch (hw->mac.type) {
	case e1000_i354:
		pthresh = I354_TX_PTHRESH;
		break;
	case e1000_82575:
	case e1000_82576:
	case e1000_82580:
	case e1000_i350:
	case e1000_i210:
	case e1000_i211:
	case e1000_vfadapt:
	case e1000_vfadapt_i350:
		pthresh = IGB_TX_PTHRESH;
		break;
	default:
		KASSERT(0, ("%s: unsupported MAC type %d", __func__,
		    hw->mac.type));
		pthresh = IGB_TX_PTHRESH;
		break;
	}

	return (pthresh | (IGB_TX_HTHRESH << 8) |
	    E1000_TXDCTL_QUEUE_ENABLE);
}

/*********************************************************************
 *
 *  Enable transmit unit.
 *
 **********************************************************************/
void
em_initialize_transmit_rings(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = sc->shared;
	struct em_tx_queue *que;
	struct tx_ring	*txr;
	struct e1000_hw	*hw = &sc->hw;
	u32 txdctl;

	for (int i = 0; i < sc->tx_num_queues; i++) {
		u64 bus_addr;
		caddr_t offp, endp;
		uint32_t qid;

		que = &sc->tx_queues[i];
		txr = &que->txr;
		qid = txr->me;
		bus_addr = txr->tx_paddr;

		/* Clear checksum offload context. */
		offp = (caddr_t)txr + offsetof(struct tx_ring, csum_flags);
		endp = (caddr_t)(txr + 1);
		memset(offp, 0, endp - offp);

		if (hw->mac.type >= igb_mac_min) {
			txdctl = E1000_READ_REG(hw, E1000_TXDCTL(qid));
			E1000_WRITE_REG(hw, E1000_TXDCTL(qid),
			    txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);
			E1000_WRITE_FLUSH(hw);
		}

		/* Base and Len of TX Ring */
		E1000_WRITE_REG(hw, E1000_TDLEN(qid),
		    scctx->isc_ntxd[0] * sizeof(struct e1000_tx_desc));
		E1000_WRITE_REG(hw, E1000_TDBAH(qid), (u32)(bus_addr >> 32));
		E1000_WRITE_REG(hw, E1000_TDBAL(qid), (u32)bus_addr);
		/* Init the HEAD/TAIL indices */
		E1000_WRITE_REG(hw, E1000_TDT(qid), 0);
		E1000_WRITE_REG(hw, E1000_TDH(qid), 0);

		HW_DEBUGOUT2("Base = %x, Length = %x\n",
		    E1000_READ_REG(hw, E1000_TDBAL(qid)),
		    E1000_READ_REG(hw, E1000_TDLEN(qid)));

		if (hw->mac.type < igb_mac_min)
			txdctl = em_legacy_txdctl(hw);
		else
			txdctl = igb_txdctl(hw);

		E1000_WRITE_REG(hw, E1000_TXDCTL(qid), txdctl);
	}
}

static void
em_initialize_transmit_unit(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	u32 tctl, tarc, tipg = 0;

	INIT_DEBUGOUT("em_initialize_transmit_unit: begin");
	KASSERT(!sc->vf_ifp, ("%s called for a VF", __func__));

	em_initialize_transmit_rings(ctx);

	/* Set the default values for the Tx Inter Packet Gap timer */
	switch (hw->mac.type) {
	case e1000_80003es2lan:
		tipg = DEFAULT_82543_TIPG_IPGR1;
		tipg |= DEFAULT_80003ES2LAN_TIPG_IPGR2 <<
		    E1000_TIPG_IPGR2_SHIFT;
		break;
	case e1000_82542:
		tipg = DEFAULT_82542_TIPG_IPGT;
		tipg |= DEFAULT_82542_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT;
		tipg |= DEFAULT_82542_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT;
		break;
	default:
		if (hw->phy.media_type == e1000_media_type_fiber ||
		    hw->phy.media_type == e1000_media_type_internal_serdes)
			tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
		else
			tipg = DEFAULT_82543_TIPG_IPGT_COPPER;
		tipg |= DEFAULT_82543_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT;
		tipg |= DEFAULT_82543_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT;
	}

	if (hw->mac.type < igb_mac_min) {
		E1000_WRITE_REG(hw, E1000_TIPG, tipg);
		E1000_WRITE_REG(hw, E1000_TIDV, sc->tx_int_delay.value);

		if (sc->tx_int_delay.value > 0)
			sc->txd_cmd |= E1000_TXD_CMD_IDE;
	}

	if (hw->mac.type >= e1000_82540 && hw->mac.type < igb_mac_min)
		E1000_WRITE_REG(hw, E1000_TADV, sc->tx_abs_int_delay.value);

	if (hw->mac.type == e1000_82571 || hw->mac.type == e1000_82572) {
		tarc = E1000_READ_REG(hw, E1000_TARC(0));
		tarc |= TARC_SPEED_MODE_BIT;
		E1000_WRITE_REG(hw, E1000_TARC(0), tarc);
	} else if (hw->mac.type == e1000_80003es2lan) {
		/* errata: program both queues to unweighted RR */
		tarc = E1000_READ_REG(hw, E1000_TARC(0));
		tarc |= 1;
		E1000_WRITE_REG(hw, E1000_TARC(0), tarc);
		tarc = E1000_READ_REG(hw, E1000_TARC(1));
		tarc |= 1;
		E1000_WRITE_REG(hw, E1000_TARC(1), tarc);
	} else if (hw->mac.type == e1000_82574) {
		tarc = E1000_READ_REG(hw, E1000_TARC(0));
		tarc |= TARC_ERRATA_BIT;
		if ( sc->tx_num_queues > 1) {
			tarc |= (TARC_COMPENSATION_MODE | TARC_MQ_FIX);
			E1000_WRITE_REG(hw, E1000_TARC(0), tarc);
			E1000_WRITE_REG(hw, E1000_TARC(1), tarc);
		} else
			E1000_WRITE_REG(hw, E1000_TARC(0), tarc);
	}

	/* Program the Transmit Control Register */
	tctl = E1000_READ_REG(hw, E1000_TCTL);
	tctl &= ~E1000_TCTL_CT;
	tctl |= (E1000_TCTL_PSP | E1000_TCTL_RTLC | E1000_TCTL_EN |
		   (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT));

	if (hw->mac.type >= e1000_82571 && hw->mac.type < igb_mac_min)
		tctl |= E1000_TCTL_MULR;

	/* This write will effectively turn on the transmit unit. */
	E1000_WRITE_REG(hw, E1000_TCTL, tctl);

	/* SPT and KBL errata workarounds */
	if (hw->mac.type == e1000_pch_spt) {
		u32 reg;
		reg = E1000_READ_REG(hw, E1000_IOSFPC);
		reg |= E1000_RCTL_RDMTS_HEX;
		E1000_WRITE_REG(hw, E1000_IOSFPC, reg);
		/* i218-i219 Specification Update 1.5.4.5 */
		reg = E1000_READ_REG(hw, E1000_TARC(0));
		reg &= ~E1000_TARC0_CB_MULTIQ_3_REQ;
		reg |= E1000_TARC0_CB_MULTIQ_2_REQ;
		E1000_WRITE_REG(hw, E1000_TARC(0), reg);
	}
}

/*********************************************************************
 *
 *  Enable receive unit.
 *
 **********************************************************************/
#define BSIZEPKT_ROUNDUP ((1<<E1000_SRRCTL_BSIZEPKT_SHIFT)-1)

static u32
igb_rxdctl(struct e1000_softc *sc, u32 rxdctl)
{
	struct e1000_hw *hw;
	u32 mask, pthresh, wthresh;

	hw = &sc->hw;
	mask = IGB_RXDCTL_THRESH_MASK;
	switch (hw->mac.type) {
	case e1000_82575:
		mask = IGB_82575_RXDCTL_THRESH_MASK;
		pthresh = IGB_RX_PTHRESH;
		wthresh = IGB_RX_WTHRESH;
		break;
	case e1000_82576:
		pthresh = IGB_RX_PTHRESH;
		wthresh = sc->intr_type == IFLIB_INTR_MSIX ?
		    IGB_82576_RX_WTHRESH : IGB_RX_WTHRESH;
		break;
	case e1000_vfadapt:
		/* 82576 VFs always need the MSI-X writeback workaround. */
		pthresh = IGB_RX_PTHRESH;
		wthresh = IGB_82576_RX_WTHRESH;
		break;
	case e1000_i354:
		pthresh = I354_RX_PTHRESH;
		wthresh = IGB_RX_WTHRESH;
		break;
	case e1000_82580:
	case e1000_i350:
	case e1000_i210:
	case e1000_i211:
	case e1000_vfadapt_i350:
		pthresh = IGB_RX_PTHRESH;
		wthresh = IGB_RX_WTHRESH;
		break;
	default:
		KASSERT(0, ("%s: unsupported MAC type %d", __func__,
		    hw->mac.type));
		pthresh = IGB_RX_PTHRESH;
		wthresh = IGB_RX_WTHRESH;
		break;
	}

	rxdctl &= ~mask;
	rxdctl |= pthresh | (IGB_RX_HTHRESH << 8) |
	    (wthresh << 16) | E1000_RXDCTL_QUEUE_ENABLE;
	return (rxdctl);
}

void
igb_initialize_receive_rings(if_ctx_t ctx, bool drop)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = sc->shared;
	struct e1000_hw *hw = &sc->hw;
	struct em_rx_queue *que;
	u32 srrctl;

	srrctl = (sc->rx_mbuf_sz + BSIZEPKT_ROUNDUP) >>
	    E1000_SRRCTL_BSIZEPKT_SHIFT;
	srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
	if (drop)
		srrctl |= E1000_SRRCTL_DROP_EN;

	for (int i = 0; i < sc->rx_num_queues; i++) {
		struct rx_ring *rxr;
		u64 bus_addr;
		u32 rxdctl;
		uint32_t qid;

		que = &sc->rx_queues[i];
		rxr = &que->rxr;
		bus_addr = rxr->rx_paddr;
		qid = rxr->me;

		rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(qid));
		E1000_WRITE_REG(hw, E1000_RXDCTL(qid),
		    rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);
		E1000_WRITE_FLUSH(hw);

		E1000_WRITE_REG(hw, E1000_RDLEN(qid),
		    scctx->isc_nrxd[0] * sizeof(struct e1000_rx_desc));
		E1000_WRITE_REG(hw, E1000_RDBAH(qid),
		    (uint32_t)(bus_addr >> 32));
		E1000_WRITE_REG(hw, E1000_RDBAL(qid), (uint32_t)bus_addr);
		E1000_WRITE_REG(hw, E1000_RDH(qid), 0);
		E1000_WRITE_REG(hw, E1000_RDT(qid), 0);
		E1000_WRITE_REG(hw, E1000_SRRCTL(qid), srrctl);

		rxdctl = igb_rxdctl(sc, rxdctl);
		E1000_WRITE_REG(hw, E1000_RXDCTL(qid), rxdctl);
	}
}

static bool
em_integrated_jumbo_rx(struct e1000_hw *hw)
{
	switch (hw->mac.type) {
	case e1000_ich9lan:
	case e1000_ich10lan:
	case e1000_pchlan:
	case e1000_pch2lan:
	case e1000_pch_lpt:
	case e1000_pch_spt:
	case e1000_pch_cnp:
	case e1000_pch_tgp:
	case e1000_pch_adp:
	case e1000_pch_mtp:
	case e1000_pch_ptp:
	case e1000_pch_nvp:
		return (true);
	default:
		return (false);
	}
}

static void
em_initialize_receive_unit(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = sc->shared;
	if_t ifp = iflib_get_ifp(ctx);
	struct e1000_hw *hw = &sc->hw;
	struct em_rx_queue *que;
	int i;
	uint32_t rctl, rxcsum;

	INIT_DEBUGOUT("em_initialize_receive_units: begin");
	KASSERT(!sc->vf_ifp, ("%s called for a VF", __func__));

	/*
	 * Make sure receives are disabled while setting up the descriptor
	 * ring.
	 */
	rctl = E1000_READ_REG(hw, E1000_RCTL);
	/* Do not disable if ever enabled on this hardware. */
	if (hw->mac.type != e1000_82574 &&
	    hw->mac.type != e1000_82583)
		E1000_WRITE_REG(hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);

	/* Setup the Receive Control Register. */
	rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
	rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
	    E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
	    (hw->mac.mc_filter_type << E1000_RCTL_MO_SHIFT);
	rctl &= ~E1000_RCTL_SBP;

	if (igb_iov_enabled(sc) || if_getmtu(ifp) > ETHERMTU)
		rctl |= E1000_RCTL_LPE;
	else
		rctl &= ~E1000_RCTL_LPE;
	if (!em_disable_crc_stripping)
		rctl |= E1000_RCTL_SECRC;

	/* lem/em default interrupt moderation */
	if (hw->mac.type < igb_mac_min) {
		if (hw->mac.type >= e1000_82540) {
			E1000_WRITE_REG(hw, E1000_RADV,
			    sc->rx_abs_int_delay.value);

			/* Set the default interrupt throttling rate */
			E1000_WRITE_REG(hw, E1000_ITR,
			    EM_INTS_TO_ITR(em_max_interrupt_rate));

			/*
			 * The 82574 MSI-X EITR registers are programmed
			 * with the same value further below.  Either way
			 * the hardware now holds the default rate, so seed
			 * the software copy to match; otherwise a stale
			 * itr_setting left over from AIM makes em_newitr()
			 * skip the write that would restore it.
			 */
			for (i = 0, que = sc->rx_queues; i < sc->rx_num_queues;
			    i++, que++)
				que->itr_setting =
				    EM_INTS_TO_ITR(em_max_interrupt_rate);
		}

		/* XXX TEMPORARY WORKAROUND: on some systems with 82573
		 * long latencies are observed, like Lenovo X60. This
		 * change eliminates the problem, but since having positive
		 * values in RDTR is a known source of problems on other
		 * platforms another solution is being sought.
		 */
		if (hw->mac.type == e1000_82573)
			E1000_WRITE_REG(hw, E1000_RDTR, 0x20);
		else
			E1000_WRITE_REG(hw, E1000_RDTR,
			    sc->rx_int_delay.value);
	}

	if (hw->mac.type >= em_mac_min) {
		uint32_t rfctl;
		/* Use extended rx descriptor formats */
		rfctl = E1000_READ_REG(hw, E1000_RFCTL);
		rfctl |= E1000_RFCTL_EXTEN;

		/*
		 * When using MSI-X interrupts we need to throttle
		 * using the EITR register (82574 only)
		 */
		if (hw->mac.type == e1000_82574) {
			for (int i = 0; i < 4; i++)
				E1000_WRITE_REG(hw, E1000_EITR_82574(i),
				    EM_INTS_TO_ITR(em_max_interrupt_rate));
			/* Disable accelerated acknowledge */
			rfctl |= E1000_RFCTL_ACK_DIS;
		}
		E1000_WRITE_REG(hw, E1000_RFCTL, rfctl);
	}

	rxcsum = E1000_READ_REG(hw, E1000_RXCSUM);
	if (if_getcapenable(ifp) & IFCAP_RXCSUM) {
		rxcsum |= E1000_RXCSUM_TUOFL | E1000_RXCSUM_IPOFL;
		if (hw->mac.type > e1000_82575)
			rxcsum |= E1000_RXCSUM_CRCOFL;
		else if (hw->mac.type < em_mac_min &&
		    if_getcapenable(ifp) & IFCAP_HWCSUM_IPV6)
			rxcsum |= E1000_RXCSUM_IPV6OFL;
	} else {
		rxcsum &= ~(E1000_RXCSUM_IPOFL | E1000_RXCSUM_TUOFL);
		if (hw->mac.type > e1000_82575)
			rxcsum &= ~E1000_RXCSUM_CRCOFL;
		else if (hw->mac.type < em_mac_min)
			rxcsum &= ~E1000_RXCSUM_IPV6OFL;
	}

	if (sc->rx_num_queues > 1) {
		/* RSS hash needed in the Rx descriptor */
		rxcsum |= E1000_RXCSUM_PCSD;

		if (hw->mac.type >= igb_mac_min)
			igb_initialize_rss_mapping(sc);
		else
			em_initialize_rss_mapping(sc);
	}
	E1000_WRITE_REG(hw, E1000_RXCSUM, rxcsum);

	for (i = 0, que = sc->rx_queues;
	    hw->mac.type < igb_mac_min && i < sc->rx_num_queues;
	    i++, que++) {
		struct rx_ring *rxr = &que->rxr;
		/* Setup the Base and Length of the Rx Descriptor Ring */
		u64 bus_addr = rxr->rx_paddr;
		uint32_t qid = rxr->me;
#if 0
		u32 rdt = sc->rx_num_queues -1;  /* default */
#endif

		E1000_WRITE_REG(hw, E1000_RDLEN(qid),
		    scctx->isc_nrxd[0] *
		    sizeof(union e1000_rx_desc_extended));
		E1000_WRITE_REG(hw, E1000_RDBAH(qid), (u32)(bus_addr >> 32));
		E1000_WRITE_REG(hw, E1000_RDBAL(qid), (u32)bus_addr);
		/* Setup the Head and Tail Descriptor Pointers */
		E1000_WRITE_REG(hw, E1000_RDH(qid), 0);
		E1000_WRITE_REG(hw, E1000_RDT(qid), 0);
	}

	/* Increase receive-descriptor prefetching for integrated jumbo MACs. */
	if (em_integrated_jumbo_rx(hw) && if_getmtu(ifp) > ETHERMTU) {
		u32 rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(0));

		rxdctl &= ~(EM_RXDCTL_PTHRESH_MASK |
		    EM_RXDCTL_HTHRESH_MASK);
		rxdctl |= EM_JUMBO_RX_PTHRESH |
		    (EM_JUMBO_RX_HTHRESH << 8);
		E1000_WRITE_REG(hw, E1000_RXDCTL(0), rxdctl);
	} else if (hw->mac.type == e1000_82574) {
		/* RXDCTL(0) writes are mirrored to RXDCTL(1) on 82574. */
		for (int i = 0; i < sc->rx_num_queues; i++) {
			u32 rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(i));

			rxdctl &= ~EM_RXDCTL_THRESH_MASK;
			rxdctl |= EM_82574_RX_PTHRESH |
			    (EM_82574_RX_HTHRESH << 8) |
			    (EM_82574_RX_WTHRESH << 16) |
			    E1000_RXDCTL_THRESH_UNIT_DESC;
			E1000_WRITE_REG(hw, E1000_RXDCTL(i), rxdctl);
		}
	} else if (hw->mac.type >= igb_mac_min) {
		bool drop;
		u32 psize;

		if (igb_iov_enabled(sc)) {
			E1000_WRITE_REG(hw, E1000_RLPML,
			    IGB_IOV_MAX_FRAME_SIZE);
		} else if (if_getmtu(ifp) > ETHERMTU) {
			psize = scctx->isc_max_frame_size;
			/* are we on a vlan? */
			if (if_vlantrunkinuse(ifp))
				psize += VLAN_TAG_SIZE;

			E1000_WRITE_REG(hw, E1000_RLPML, psize);
		}

		/*
		 * If TX flow control is disabled and there's >1 queue
		 * defined, enable DROP.
		 *
		 * This drops frames rather than hanging the RX MAC for all
		 * queues.
		 */
		drop = igb_iov_enabled(sc) ||
		    ((sc->rx_num_queues > 1) &&
		    (sc->fc == e1000_fc_none ||
		    sc->fc == e1000_fc_rx_pause));
		igb_initialize_receive_rings(ctx, drop);
	} else if (hw->mac.type >= e1000_pch2lan) {
		if (if_getmtu(ifp) > ETHERMTU)
			e1000_lv_jumbo_workaround_ich8lan(hw, true);
		else
			e1000_lv_jumbo_workaround_ich8lan(hw, false);
	}

	/* Make sure VLAN Filters are off */
	rctl &= ~E1000_RCTL_VFE;

	/* Set up packet buffer size, overridden by per queue srrctl on igb */
	if (hw->mac.type < igb_mac_min) {
		if (sc->rx_mbuf_sz > 2048 && sc->rx_mbuf_sz <= 4096)
			rctl |= E1000_RCTL_SZ_4096 | E1000_RCTL_BSEX;
		else if (sc->rx_mbuf_sz > 4096 && sc->rx_mbuf_sz <= 8192)
			rctl |= E1000_RCTL_SZ_8192 | E1000_RCTL_BSEX;
		else if (sc->rx_mbuf_sz > 8192)
			rctl |= E1000_RCTL_SZ_16384 | E1000_RCTL_BSEX;
		else {
			rctl |= E1000_RCTL_SZ_2048;
			rctl &= ~E1000_RCTL_BSEX;
		}
	} else
		rctl |= E1000_RCTL_SZ_2048;

	/*
	 * rctl bits 11:10 are as follows
	 * lem: reserved
	 * em: DTYPE
	 * igb: reserved
	 * and should be 00 on all of the above
	 */
	rctl &= ~0x00000C00;

	/* Write out the settings */
	E1000_WRITE_REG(hw, E1000_RCTL, rctl);

	return;
}

static void
em_if_vlan_register(if_ctx_t ctx, u16 vtag)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	bool present;
	u32 index, mask;

	index = (vtag >> 5) & 0x7F;
	mask = 1U << (vtag & 0x1F);
	present = (sc->shadow_vfta[index] & mask) != 0;
	/*
	 * On a VF, record registration intent for replay even if the PF is not
	 * ready to accept it yet.
	 */
	sc->shadow_vfta[index] |= mask;
	sc->vf_vfta_stale[index] &= ~mask;
	if (!present)
		++sc->num_vlans;
	if (sc->vf_ifp &&
	    e1000_vfta_set_vf(&sc->hw, vtag, true) != E1000_SUCCESS) {
		igbv_vlan_retry_add(sc, vtag);
		device_printf(sc->dev,
		    "VF VLAN %u add request failed\n", vtag);
	} else if (sc->vf_ifp)
		igbv_vlan_retry_clear(sc, vtag);
	if (!sc->vf_ifp) {
		if (igb_iov_enabled(sc))
			igb_iov_rebuild_vlan(sc);
		else
			em_if_vlan_filter_write(sc, index);
	}
}

static void
em_if_vlan_unregister(if_ctx_t ctx, u16 vtag)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	bool present;
	u32 index, mask;

	index = (vtag >> 5) & 0x7F;
	mask = 1U << (vtag & 0x1F);
	present = (sc->shadow_vfta[index] & mask) != 0;
	if (sc->vf_ifp)
		igbv_vlan_retry_clear(sc, vtag);
	if (sc->vf_ifp &&
	    e1000_vfta_set_vf(&sc->hw, vtag, false) != E1000_SUCCESS) {
		device_printf(sc->dev,
		    "VF VLAN %u remove request failed\n", vtag);
		/*
		 * Hardware might still admit this VID.  Preserve its receive
		 * tag until a successful VF reset proves the stale filter gone.
		 */
		sc->vf_vfta_stale[index] |= mask;
	} else {
		sc->vf_vfta_stale[index] &= ~mask;
	}
	sc->shadow_vfta[index] &= ~mask;
	if (present)
		--sc->num_vlans;
	if (!sc->vf_ifp) {
		if (igb_iov_enabled(sc))
			igb_iov_rebuild_vlan(sc);
		else
			em_if_vlan_filter_write(sc, index);
	}
}

static bool
em_if_vlan_filter_capable(if_ctx_t ctx)
{
	if_t ifp = iflib_get_ifp(ctx);

	if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) &&
	    !em_disable_crc_stripping)
		return (true);

	return (false);
}

static bool
em_if_vlan_filter_used(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);

	if (!em_if_vlan_filter_capable(ctx))
		return (false);

	for (int i = 0; i < EM_VFTA_SIZE; i++)
		if (sc->shadow_vfta[i] != 0)
			return (true);

	return (false);
}

static void
em_if_vlan_filter_enable(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	u32 reg;

	reg = E1000_READ_REG(hw, E1000_RCTL);
	reg &= ~E1000_RCTL_CFIEN;
	reg |= E1000_RCTL_VFE;
	E1000_WRITE_REG(hw, E1000_RCTL, reg);
}

static void
em_if_vlan_filter_disable(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	u32 reg;

	reg = E1000_READ_REG(hw, E1000_RCTL);
	reg &= ~(E1000_RCTL_VFE | E1000_RCTL_CFIEN);
	E1000_WRITE_REG(hw, E1000_RCTL, reg);
}

static void
em_if_vlan_filter_write(struct e1000_softc *sc, int changed_index)
{
	struct e1000_hw *hw = &sc->hw;

	KASSERT(!sc->vf_ifp, ("VLAN filter write on VF\n"));

	/* Disable interrupts for lem(4) devices during the filter change */
	if (hw->mac.type < em_mac_min)
		em_if_intr_disable(sc->ctx);

	/*
	 * Restore every retained VLAN after reset.  Also write the changed
	 * word when its final VLAN was removed so stale hardware membership
	 * does not survive a zero shadow value.
	 */
	for (int i = 0; i < EM_VFTA_SIZE; i++)
		if (sc->shadow_vfta[i] != 0 || i == changed_index)
			e1000_write_vfta(hw, i, sc->shadow_vfta[i]);

	/* Re-enable interrupts for lem-class devices */
	if (hw->mac.type < em_mac_min)
		em_if_intr_enable(sc->ctx);
}

static void
em_setup_vlan_hw_support(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	if_t ifp = iflib_get_ifp(ctx);
	s32 error;
	u32 max_frame_size, reg;
	u16 vid;
	int restore_failures;

	/*
	 * Only PFs have control over VLAN HW filtering
	 * configuration. VFs have to act as if it's always
	 * enabled.
	 */
	if (sc->vf_ifp) {
		max_frame_size = min(sc->shared->isc_max_frame_size +
		    VLAN_TAG_SIZE, IGB_IOV_MAX_FRAME_SIZE);
		e1000_rlpml_set_vf(hw, max_frame_size);
		restore_failures = 0;
		for (vid = 0; vid < 4096; vid++) {
			if ((sc->shadow_vfta[vid >> 5] &
			    (1U << (vid & 0x1f))) == 0)
				continue;
			/*
			 * Desired state remains in shadow_vfta for the next
			 * replay if the PF mailbox is absent during reset.
			 */
			error = e1000_vfta_set_vf(hw, vid, true);
			if (error != E1000_SUCCESS) {
				igbv_vlan_retry_add(sc, vid);
				restore_failures++;
			} else
				igbv_vlan_retry_clear(sc, vid);
		}
		if (restore_failures != 0)
			device_printf(sc->dev,
			    "VF VLAN restore failed for %d VIDs; retrying\n",
			    restore_failures);
		return;
	}

	if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING &&
	    !em_disable_crc_stripping) {
		reg = E1000_READ_REG(hw, E1000_CTRL);
		reg |= E1000_CTRL_VME;
		E1000_WRITE_REG(hw, E1000_CTRL, reg);
	} else {
		reg = E1000_READ_REG(hw, E1000_CTRL);
		reg &= ~E1000_CTRL_VME;
		E1000_WRITE_REG(hw, E1000_CTRL, reg);
	}

	/*
	 * SR-IOV always needs VFE for VF isolation.  When PF hardware VLAN
	 * filtering is disabled, the IOV VLAN rebuild instead makes the PF
	 * VLAN-promiscuous without disabling the global filter.
	 */
	if (!em_if_vlan_filter_capable(ctx))  {
		if (igb_iov_enabled(sc)) {
#ifdef PCI_IOV
			sc->iov_pf_vlan_promisc = true;
#endif
			em_if_vlan_filter_enable(sc);
		} else
			em_if_vlan_filter_disable(sc);
		return;
	}
#ifdef PCI_IOV
	if (igb_iov_enabled(sc))
		sc->iov_pf_vlan_promisc = false;
#endif

	/*
	 * A soft reset zero's out the VFTA, so
	 * we need to repopulate it now.
	 * We also insert VLAN 0 in the filter list, so we pass VLAN 0 tagged
	 * traffic through. This will write the entire table.
	 */
	em_if_vlan_register(ctx, 0);

	/* Enable the Filter Table */
	em_if_vlan_filter_enable(sc);
}

static void
em_if_intr_enable(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	u32 ims_mask = IMS_ENABLE_MASK | em_fatal_error_intr_mask(sc);

	if (sc->intr_type == IFLIB_INTR_MSIX) {
		E1000_WRITE_REG(hw, EM_EIAC, sc->ims);
		ims_mask |= sc->ims;
	}

	E1000_WRITE_REG(hw, E1000_IMS, ims_mask);
	E1000_WRITE_FLUSH(hw);
}

static void
em_if_intr_disable(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;

	if (sc->intr_type == IFLIB_INTR_MSIX)
		E1000_WRITE_REG(hw, EM_EIAC, 0);
	E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
	E1000_WRITE_FLUSH(hw);
}

static void
igb_if_intr_enable(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	u32 mask, reg;

	if (igb_device_reset_pending(sc))
		return;
	if (__predict_true(sc->intr_type == IFLIB_INTR_MSIX)) {
		mask = (sc->que_mask | sc->link_mask);
		/*
		 * VF interrupt controls are also mapped into these registers.
		 * Preserve them and change only the PF vectors we own.
		 */
		reg = E1000_READ_REG(hw, E1000_EIAC);
		E1000_WRITE_REG(hw, E1000_EIAC, reg | mask);
		reg = E1000_READ_REG(hw, E1000_EIAM);
		E1000_WRITE_REG(hw, E1000_EIAM, reg | mask);
		igb_iov_intr_drain_stale(sc);
		E1000_WRITE_REG(hw, E1000_EIMS, mask);
		E1000_WRITE_REG(hw, E1000_IMS,
		    E1000_IMS_LSC | igb_device_reset_intr_mask(sc) |
		    igb_iov_intr_mask(sc) |
		    em_fatal_error_intr_mask(sc));
	} else {
		mask = IMS_ENABLE_MASK | igb_device_reset_intr_mask(sc) |
		    em_fatal_error_intr_mask(sc);
		/* Reading ICR masks every shared interrupt before the filter runs. */
		E1000_WRITE_REG(hw, E1000_IAM, mask);
		E1000_WRITE_REG(hw, E1000_IMS, mask);
	}
	E1000_WRITE_FLUSH(hw);
}

static void
igb_if_intr_disable(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	u32 mask, reg;

	/* This is the first CTX-owned register access after ICR.DRSTA. */
	igb_prepare_device_reset(sc);

	if (__predict_true(sc->intr_type == IFLIB_INTR_MSIX)) {
		/*
		 * Do not use a blanket EIMC write here.  VF interrupt controls
		 * are mapped into the same PF register space, so clearing bits
		 * we do not own can leave running VFs with interrupts masked.
		 * Before initial queue configuration the owned mask is zero
		 * because this driver has not enabled a vector yet.
		 */
		mask = (sc->que_mask | sc->link_mask);
		reg = E1000_READ_REG(hw, E1000_EIAM);
		E1000_WRITE_REG(hw, E1000_EIAM, reg & ~mask);
		E1000_WRITE_REG(hw, E1000_EIMC, mask);
		reg = E1000_READ_REG(hw, E1000_EIAC);
		E1000_WRITE_REG(hw, E1000_EIAC, reg & ~mask);
	} else
		E1000_WRITE_REG(hw, E1000_IAM, 0);
	E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff);
	E1000_WRITE_FLUSH(hw);
}

/*
 * Bit of a misnomer, what this really means is
 * to enable OS management of the system... aka
 * to disable special hardware management features
 */
static void
em_init_manageability(struct e1000_softc *sc)
{
	/* A shared code workaround */
#define E1000_82542_MANC2H E1000_MANC2H
	if (sc->has_manage) {
		int manc2h = E1000_READ_REG(&sc->hw, E1000_MANC2H);
		int manc = E1000_READ_REG(&sc->hw, E1000_MANC);

		/* disable hardware interception of ARP */
		manc &= ~(E1000_MANC_ARP_EN);

		/* enable receiving management packets to the host */
		manc |= E1000_MANC_EN_MNG2HOST;
#define E1000_MNG2HOST_PORT_623 (1 << 5)
#define E1000_MNG2HOST_PORT_664 (1 << 6)
		manc2h |= E1000_MNG2HOST_PORT_623;
		manc2h |= E1000_MNG2HOST_PORT_664;
		E1000_WRITE_REG(&sc->hw, E1000_MANC2H, manc2h);
		E1000_WRITE_REG(&sc->hw, E1000_MANC, manc);
	}
}

/*
 * Give control back to hardware management
 * controller if there is one.
 */
static void
em_release_manageability(struct e1000_softc *sc)
{
	if (sc->has_manage) {
		int manc = E1000_READ_REG(&sc->hw, E1000_MANC);

		/* re-enable hardware interception of ARP */
		manc |= E1000_MANC_ARP_EN;
		manc &= ~E1000_MANC_EN_MNG2HOST;

		E1000_WRITE_REG(&sc->hw, E1000_MANC, manc);
	}
}

/*
 * em_get_hw_control sets the {CTRL_EXT|FWSM}:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means
 * that the driver is loaded. For AMT version type f/w
 * this means that the network i/f is open.
 */
static void
em_get_hw_control(struct e1000_softc *sc)
{
	u32 ctrl_ext, swsm;

	if (sc->vf_ifp)
		return;

	if (sc->hw.mac.type == e1000_82573) {
		swsm = E1000_READ_REG(&sc->hw, E1000_SWSM);
		E1000_WRITE_REG(&sc->hw, E1000_SWSM,
		    swsm | E1000_SWSM_DRV_LOAD);
		return;
	}
	/* else */
	ctrl_ext = E1000_READ_REG(&sc->hw, E1000_CTRL_EXT);
	E1000_WRITE_REG(&sc->hw, E1000_CTRL_EXT,
	    ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);
}

/*
 * em_release_hw_control resets {CTRL_EXT|FWSM}:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means that
 * the driver is no longer loaded. For AMT versions of the
 * f/w this means that the network i/f is closed.
 */
static void
em_release_hw_control(struct e1000_softc *sc)
{
	u32 ctrl_ext, swsm;

	if (!sc->has_manage)
		return;

	if (sc->hw.mac.type == e1000_82573) {
		swsm = E1000_READ_REG(&sc->hw, E1000_SWSM);
		E1000_WRITE_REG(&sc->hw, E1000_SWSM,
		    swsm & ~E1000_SWSM_DRV_LOAD);
		return;
	}
	/* else */
	ctrl_ext = E1000_READ_REG(&sc->hw, E1000_CTRL_EXT);
	E1000_WRITE_REG(&sc->hw, E1000_CTRL_EXT,
	    ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
	return;
}

bool
em_is_valid_ether_addr(const u8 *addr)
{
	static const u8 zero_addr[ETHER_ADDR_LEN];

	return (!ETHER_IS_MULTICAST(addr) &&
	    memcmp(addr, zero_addr, ETHER_ADDR_LEN) != 0);
}

static bool
em_automask_tso(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = iflib_get_softc_ctx(ctx);
	if_t ifp = iflib_get_ifp(ctx);
	bool reset_needed;
	int drvflags;

	if (!em_unsupported_tso && sc->link_speed &&
	    sc->link_speed != SPEED_1000 &&
	    scctx->isc_capenable & IFCAP_TSO) {
		device_printf(sc->dev,
		    "Disabling TSO for 10/100 Ethernet.\n");
		sc->tso_automasked = scctx->isc_capenable & IFCAP_TSO;
		scctx->isc_capenable &= ~IFCAP_TSO;
		if_setcapenablebit(ifp, 0, IFCAP_TSO);
	} else if (sc->link_speed == SPEED_1000 && sc->tso_automasked) {
		device_printf(sc->dev, "Re-enabling TSO for GbE.\n");
		scctx->isc_capenable |= sc->tso_automasked;
		if_setcapenablebit(ifp, sc->tso_automasked, 0);
		sc->tso_automasked = 0;
	} else {
		return (false);
	}

	/*
	 * Reset a running interface, or one being initialized while
	 * administratively up.  OACTIVE remains set after iflib_stop(), so
	 * it alone cannot distinguish initialization from an interface that
	 * is down.  In other states, the next initialization will apply the
	 * updated capabilities.
	 */
	drvflags = if_getdrvflags(ifp);
	reset_needed = (drvflags & IFF_DRV_RUNNING) != 0 ||
	    ((drvflags & IFF_DRV_OACTIVE) != 0 &&
	    (if_getflags(ifp) & IFF_UP) != 0);
	if (!reset_needed)
		return (false);

	/* iflib_init_locked handles ifnet hwassistbits */
	iflib_request_reset(ctx);
	return (true);
}

/*
** Parse the interface capabilities with regard
** to both system management and wake-on-lan for
** later use.
*/
static void
em_get_wakeup(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_softc_ctx_t scctx = iflib_get_softc_ctx(ctx);
	device_t dev = iflib_get_dev(ctx);
	u16 eeprom_data = 0, device_id, apme_mask;
	bool apme;
	int error, wol_capabilities;

	sc->has_manage = e1000_enable_mng_pass_thru(&sc->hw);
	apme_mask = EM_EEPROM_APME_HIGH;
	error = E1000_SUCCESS;

	switch (sc->hw.mac.type) {
	case e1000_82542:
	case e1000_82543:
		break;
	case e1000_82544:
		error = e1000_read_nvm(&sc->hw,
		    NVM_INIT_CONTROL2_REG, 1, &eeprom_data);
		apme_mask = EM_EEPROM_APME_LOW;
		break;
	case e1000_82541:
	case e1000_82547:
		error = e1000_read_nvm(&sc->hw,
		    NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
		/* The EI parts place APM Enable in the low byte. */
		if (sc->hw.device_id != E1000_DEV_ID_82541ER_LOM)
			apme_mask = EM_EEPROM_APME_LOW;
		break;
	case e1000_82546:
	case e1000_82546_rev_3:
		if (sc->hw.bus.func == 1) {
			error = e1000_read_nvm(&sc->hw,
			    NVM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
			break;
		} else
			error = e1000_read_nvm(&sc->hw,
			    NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
		break;
	case e1000_82573:
	case e1000_82583:
		sc->has_amt = true;
		/* FALLTHROUGH */
	case e1000_82571:
	case e1000_82572:
	case e1000_80003es2lan:
		if (sc->hw.bus.func == 1) {
			error = e1000_read_nvm(&sc->hw,
			    NVM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
			break;
		} else
			error = e1000_read_nvm(&sc->hw,
			    NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
		break;
	case e1000_ich8lan:
	case e1000_ich9lan:
	case e1000_ich10lan:
	case e1000_pchlan:
	case e1000_pch2lan:
	case e1000_pch_lpt:
	case e1000_pch_spt:
	case e1000_pch_cnp:
	case e1000_pch_tgp:
	case e1000_pch_adp:
	case e1000_pch_mtp:
	case e1000_pch_ptp:
	case e1000_pch_nvp:
		apme_mask = E1000_WUC_APME;
		sc->has_amt = true;
		eeprom_data = E1000_READ_REG(&sc->hw, E1000_WUC);
		if (sc->hw.mac.type > e1000_ich10lan &&
		    (eeprom_data & E1000_WUC_PHY_WAKE) != 0)
			sc->wol_phy_wakeup = true;
		break;
	case e1000_82575:
	case e1000_82576:
		if (sc->hw.bus.func == 1)
			error = e1000_read_nvm(&sc->hw,
			    NVM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
		else
			error = e1000_read_nvm(&sc->hw,
			    NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
		sc->has_amt = true;
		break;
	case e1000_82580:
	case e1000_i350:
	case e1000_i354:
	case e1000_i210:
	case e1000_i211:
		error = e1000_read_nvm(&sc->hw,
		    NVM_INIT_CONTROL3_PORT_A +
		    NVM_82580_LAN_FUNC_OFFSET(sc->hw.bus.func), 1,
		    &eeprom_data);
		sc->has_amt = true;
		break;
	default:
		error = e1000_read_nvm(&sc->hw,
		    NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
		break;
	}
	if (error != E1000_SUCCESS && bootverbose)
		device_printf(dev, "NVM read failed while checking WoL: %d\n",
		    error);
	if ((sc->hw.mac.type == e1000_i210 ||
	    sc->hw.mac.type == e1000_i211) &&
	    sc->hw.nvm.type == e1000_nvm_invm) {
		/* The shared reader does not expose the optional iNVM word. */
		apme = (E1000_READ_REG(&sc->hw, E1000_WUC) &
		    E1000_WUC_APME) != 0;
	} else {
		apme = error == E1000_SUCCESS &&
		    (eeprom_data & apme_mask) != 0;
	}
	wol_capabilities = pci_has_pme(dev, PCI_POWERSTATE_D3_HOT) ?
	    IFCAP_WOL : 0;
	if (sc->hw.mac.type == e1000_82542 ||
	    sc->hw.mac.type == e1000_82543)
		wol_capabilities = 0;

	/* APME selects the default; board and port restrictions select support. */
	device_id = pci_get_device(dev);
	switch (device_id) {
	case E1000_DEV_ID_82542:
	case E1000_DEV_ID_82543GC_FIBER:
	case E1000_DEV_ID_82543GC_COPPER:
	case E1000_DEV_ID_82541ER:
	case E1000_DEV_ID_82541ER_LOM:
	case E1000_DEV_ID_82544EI_FIBER:
	case E1000_DEV_ID_82545EM_COPPER:
	case E1000_DEV_ID_82545EM_FIBER:
	case E1000_DEV_ID_82546EB_QUAD_COPPER:
	case E1000_DEV_ID_82546GB_QUAD_COPPER:
	case E1000_DEV_ID_82546GB_PCIE:
		wol_capabilities = 0;
		break;
	case E1000_DEV_ID_82546EB_FIBER:
	case E1000_DEV_ID_82546GB_FIBER:
		/*
		 * Wake events are supported only on port A for dual fiber,
		 * regardless of the NVM setting.
		 */
		if (sc->hw.bus.func == 1)
			wol_capabilities = 0;
		break;
	case E1000_DEV_ID_82546GB_QUAD_COPPER_KSP3:
		/* if quad port adapter, disable WoL on all but port A */
		if (global_quad_port_a != 0)
			wol_capabilities = 0;
		else
			wol_capabilities &= ~IFCAP_WOL_UCAST;
		/* Reset for multiple quad port adapters */
		if (++global_quad_port_a == 4)
			global_quad_port_a = 0;
		break;
	case E1000_DEV_ID_82571EB_COPPER:
	case E1000_DEV_ID_82571EB_FIBER:
	case E1000_DEV_ID_82571EB_SERDES:
		/* These dual-port adapters support wake only on port A. */
		if (sc->hw.bus.func == 1)
			wol_capabilities = 0;
		break;
	case E1000_DEV_ID_82571EB_SERDES_QUAD:
		wol_capabilities = 0;
		break;
	case E1000_DEV_ID_82571EB_QUAD_COPPER:
	case E1000_DEV_ID_82571EB_QUAD_FIBER:
	case E1000_DEV_ID_82571EB_QUAD_COPPER_LP:
	case E1000_DEV_ID_82571PT_QUAD_COPPER:
		/* if quad port adapter, disable WoL on all but port A */
		if (global_quad_port_a != 0)
			wol_capabilities = 0;
		/* Reset for multiple quad port adapters */
		if (++global_quad_port_a == 4)
			global_quad_port_a = 0;
		break;
	case E1000_DEV_ID_82575GB_QUAD_COPPER:
		wol_capabilities = 0;
		break;
	case E1000_DEV_ID_82575EB_FIBER_SERDES:
	case E1000_DEV_ID_82576_FIBER:
	case E1000_DEV_ID_82576_SERDES:
		if (sc->hw.bus.func == 1)
			wol_capabilities = 0;
		break;
	case E1000_DEV_ID_82576_QUAD_COPPER:
	case E1000_DEV_ID_82576_QUAD_COPPER_ET2:
		if (global_quad_port_a != 0)
			wol_capabilities = 0;
		if (++global_quad_port_a == 4)
			global_quad_port_a = 0;
		break;
	default:
		break;
	}
	/* Legacy and igb non-primary ports require an explicit NVM setting. */
	if ((sc->hw.mac.type < e1000_82571 ||
	    sc->hw.mac.type >= igb_mac_min) && sc->hw.bus.func != 0 &&
	    !apme)
		wol_capabilities = 0;

	/* Some I350-family systems expose wake support but default it off. */
	if ((sc->hw.mac.type == e1000_i350 &&
	    pci_get_subvendor(dev) == EM_SUBVENDOR_HP) ||
	    ((sc->hw.mac.type == e1000_i350 ||
	    sc->hw.mac.type == e1000_i354) &&
	    pci_get_subvendor(dev) == EM_SUBVENDOR_DELL) ||
	    (sc->hw.mac.type == e1000_i350 &&
	    ((pci_get_subdevice(dev) == EM_I350_SUBDEVICE_WOL_2 ||
	    pci_get_subdevice(dev) == EM_I350_SUBDEVICE_WOL_3) &&
	    sc->hw.bus.func == 0))) {
		wol_capabilities = pci_has_pme(dev, PCI_POWERSTATE_D3_HOT) ?
		    IFCAP_WOL : 0;
		apme = false;
	}
	if (sc->hw.mac.type == e1000_i350 &&
	    pci_get_subdevice(dev) == EM_I350_SUBDEVICE_WOL_1)
		wol_capabilities = pci_has_pme(dev, PCI_POWERSTATE_D3_HOT) ?
		    IFCAP_WOL : 0;

	scctx->isc_capabilities &= ~IFCAP_WOL;
	scctx->isc_capabilities |= wol_capabilities;
	scctx->isc_capenable &= ~IFCAP_WOL;
	if (wol_capabilities != 0 && apme)
		scctx->isc_capenable |= IFCAP_WOL_MAGIC;
}

/* Configure the requested PCI Wake-on-LAN filters for suspend. */
static int
em_enable_wakeup(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	device_t dev = iflib_get_dev(ctx);
	if_t ifp = iflib_get_ifp(ctx);
	int enabled, error = 0, master_error, mcnt;
	u32 ctrl, ctrl_ext, rctl, saved_rctl, wuc, wufc;
	bool manage, rctl_modified;

	if (sc->vf_ifp)
		return (0);
	if (!pci_has_pme(dev, PCI_POWERSTATE_D3_HOT))
		return (0);

	enabled = if_getcapenable(ifp) & if_getcapabilities(ifp) & IFCAP_WOL;
	manage = e1000_enable_mng_pass_thru(&sc->hw);
	rctl_modified = false;
	wuc = 0;
	/* Early 82545EM/82546EB need APM clocks for D3 manageability. */
	if (manage && (sc->hw.mac.type == e1000_82545 ||
	    sc->hw.mac.type == e1000_82546))
		wuc = E1000_WUC_APME;
	wufc = 0;
	if ((enabled & IFCAP_WOL_MAGIC) != 0)
		wufc |= E1000_WUFC_MAG;
	if ((enabled & IFCAP_WOL_UCAST) != 0)
		wufc |= E1000_WUFC_EX;
	if ((enabled & IFCAP_WOL_MCAST) != 0) {
		wufc |= E1000_WUFC_MC;
		bzero(sc->mta, ETHER_ADDR_LEN *
		    MAX_NUM_MULTICAST_ADDRESSES);
		mcnt = if_foreach_llmaddr(ifp, em_copy_maddr, sc->mta);
		if (mcnt < MAX_NUM_MULTICAST_ADDRESSES) {
			e1000_update_mc_addr_list(&sc->hw, sc->mta, mcnt);
		} else {
			switch (sc->hw.mac.type) {
			case e1000_82544:
			case e1000_82540:
			case e1000_82545:
			case e1000_82545_rev_3:
			case e1000_82546:
			case e1000_82546_rev_3:
			case e1000_82541:
			case e1000_82541_rev_2:
			case e1000_82547:
			case e1000_82547_rev_2:
			case e1000_82575:
			case e1000_82576:
			case e1000_82580:
				/* These parts require an MTA hit for WUFC_MC. */
				em_fill_wakeup_mta(&sc->hw);
				break;
			default:
				break;
			}
		}
	}

	if (wufc == 0) {
		if (sc->hw.mac.type >= e1000_82544) {
			E1000_WRITE_REG(&sc->hw, E1000_WUFC, 0);
			E1000_WRITE_REG(&sc->hw, E1000_WUC, wuc);
			E1000_WRITE_REG(&sc->hw, E1000_WUS, ~0U);
		}
		if (sc->wol_phy_wakeup && sc->wol_phy_armed)
			(void)em_disable_phy_wakeup(sc, NULL);
		if (manage) {
			if (sc->suspend_link_powered_down)
				em_power_up_wakeup_link(sc);
			em_configure_sx_low_power(sc, 0);
			pci_enable_pme(dev);
		} else {
			em_power_down_wakeup_link(sc);
			pci_clear_pme(dev);
		}
		goto master_disable;
	}
	bcopy(if_getlladdr(ifp), sc->hw.mac.addr, ETHER_ADDR_LEN);
	error = e1000_rar_set(&sc->hw, sc->hw.mac.addr, 0);
	if (error != E1000_SUCCESS) {
		device_printf(dev,
		    "Could not restore unicast wake address: %d\n", error);
		goto pme;
	}
	saved_rctl = E1000_READ_REG(&sc->hw, E1000_RCTL);
	rctl = saved_rctl;
	rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE | E1000_RCTL_MO_3);
	rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
	    (sc->hw.mac.mc_filter_type << E1000_RCTL_MO_SHIFT);
	if ((wufc & E1000_WUFC_MC) != 0)
		rctl |= E1000_RCTL_MPE;
	E1000_WRITE_REG(&sc->hw, E1000_RCTL, rctl);
	rctl_modified = true;

	/* Advertise the wakeup capability */
	if (sc->hw.mac.type >= e1000_82540) {
		ctrl = E1000_READ_REG(&sc->hw, E1000_CTRL);
		ctrl |= E1000_CTRL_ADVD3WUC;
		if (sc->hw.mac.type < igb_mac_min && !sc->wol_phy_wakeup)
			ctrl |= E1000_CTRL_EN_PHY_PWR_MGMT;
		E1000_WRITE_REG(&sc->hw, E1000_CTRL, ctrl);
	}

	/* Keep the laser running on legacy fiber and SerDes adapters. */
	if (sc->hw.mac.type < igb_mac_min &&
	    (sc->hw.phy.media_type == e1000_media_type_fiber ||
	    sc->hw.phy.media_type == e1000_media_type_internal_serdes)) {
		ctrl_ext = E1000_READ_REG(&sc->hw, E1000_CTRL_EXT);
		ctrl_ext |= E1000_CTRL_EXT_SDP3_DATA;
		E1000_WRITE_REG(&sc->hw, E1000_CTRL_EXT, ctrl_ext);
	}
	E1000_WRITE_REG(&sc->hw, E1000_WUS, ~0U);
	em_power_up_wakeup_link(sc);

	if (sc->hw.mac.type >= e1000_ich8lan &&
	    sc->hw.mac.type < igb_mac_min)
		e1000_suspend_workarounds_ich8lan(&sc->hw);

	if (sc->wol_phy_wakeup) {
		error = em_enable_phy_wakeup(sc, wufc);
		if (error)
			goto pme;
	} else {
		/* Enable wakeup by the MAC */
		E1000_WRITE_REG(&sc->hw, E1000_WUC,
		    wuc | E1000_WUC_PME_EN);
		E1000_WRITE_REG(&sc->hw, E1000_WUFC, wufc);
	}

	/* The IGP3 D3 power-down workaround is specific to the em family. */
	if (sc->hw.mac.type < igb_mac_min &&
	    sc->hw.phy.type == e1000_phy_igp_3)
		e1000_igp3_phy_powerdown_workaround_ich8lan(&sc->hw);
	em_configure_sx_low_power(sc, wufc);

pme:
	if (!error)
		pci_enable_pme(dev);
	else {
		E1000_WRITE_REG(&sc->hw, E1000_WUFC, 0);
		E1000_WRITE_REG(&sc->hw, E1000_WUC, wuc);
		if (rctl_modified)
			E1000_WRITE_REG(&sc->hw, E1000_RCTL, saved_rctl);
		pci_clear_pme(dev);
	}

master_disable:
	master_error = e1000_disable_pcie_master(&sc->hw);
	if (master_error != E1000_SUCCESS)
		device_printf(dev, "PCIe master disable timed out: %d\n",
		    master_error);
	master_error = pci_disable_busmaster(dev);
	if (master_error != 0)
		device_printf(dev, "PCI bus-master disable failed: %d\n",
		    master_error);

	return (error == E1000_SUCCESS ? 0 : EIO);
}

/* Configure the PCH low-power link modes used while the system sleeps. */
static void
em_configure_sx_low_power(struct e1000_softc *sc, u32 wufc)
{
	struct e1000_hw *hw = &sc->hw;
	struct e1000_dev_spec_ich8lan *dev_spec;
	s32 error;
	u16 eee_advert, lpi_ctrl;

	if (hw->mac.type < e1000_pch_lpt || hw->mac.type >= igb_mac_min ||
	    sc->suspend_link_powered_down)
		return;

	if (wufc != 0 &&
	    (wufc & (E1000_WUFC_EX | E1000_WUFC_MC | E1000_WUFC_BC)) == 0) {
		/* ULP cannot preserve directed or broad multicast wake. */
		error = e1000_enable_ulp_lpt_lp(hw, true);
		if (error != E1000_SUCCESS) {
			device_printf(sc->dev,
			    "Could not enter PHY ultra-low-power mode: %d\n",
			    error);
			return;
		}
	}

	dev_spec = &hw->dev_spec.ich8lan;
	if (hw->phy.type != e1000_phy_i217 || dev_spec->eee_disable ||
	    dev_spec->eee_lp_ability == 0)
		return;

	error = hw->phy.ops.acquire(hw);
	if (error != E1000_SUCCESS)
		goto out;
	error = hw->phy.ops.read_reg_locked(hw, I82579_LPI_CTRL, &lpi_ctrl);
	if (error != E1000_SUCCESS)
		goto release;
	error = e1000_read_emi_reg_locked(hw, I217_EEE_ADVERTISEMENT,
	    &eee_advert);
	if (error != E1000_SUCCESS)
		goto release;

	if ((eee_advert & dev_spec->eee_lp_ability &
	    I82579_EEE_100_SUPPORTED) != 0)
		lpi_ctrl |= I82579_LPI_CTRL_100_ENABLE;
	if ((eee_advert & dev_spec->eee_lp_ability &
	    I82579_EEE_1000_SUPPORTED) != 0)
		lpi_ctrl |= I82579_LPI_CTRL_1000_ENABLE;
	error = hw->phy.ops.write_reg_locked(hw, I82579_LPI_CTRL, lpi_ctrl);
release:
	hw->phy.ops.release(hw);
out:
	if (error != E1000_SUCCESS)
		device_printf(sc->dev,
		    "Could not configure Energy Efficient Ethernet for sleep: %d\n",
		    error);
}

static void
em_power_up_wakeup_link(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;

	if (hw->mac.type < igb_mac_min)
		e1000_power_up_phy(hw);
	else if (hw->phy.media_type == e1000_media_type_copper)
		e1000_power_up_phy(hw);
	else {
		e1000_power_up_fiber_serdes_link(hw);
		(void)e1000_setup_link(hw);
	}
	sc->suspend_link_powered_down = false;
}

/* Drop the unused suspend link through the controller's shared-code hook. */
static void
em_power_down_wakeup_link(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;

	if (hw->mac.type >= igb_mac_min &&
	    hw->phy.media_type != e1000_media_type_copper)
		e1000_shutdown_fiber_serdes_link(hw);
	else
		e1000_power_down_phy(hw);
	sc->suspend_link_powered_down = true;
}

/* PCH PHY wake requires the MAC receive state on the BM wake page. */
static int
em_enable_phy_wakeup(struct e1000_softc *sc, u32 wufc)
{
	struct e1000_hw *hw = &sc->hw;
	u32 mreg, wuc;
	u16 preg, wuc_enable;
	s32 error, restore_error;

	/* Copy MAC RARs to PHY RARs before selecting the BM wake page. */
	error = e1000_copy_rx_addrs_to_phy_ich8lan(hw);
	if (error != E1000_SUCCESS)
		goto out;

	error = hw->phy.ops.acquire(hw);
	if (error != E1000_SUCCESS) {
		device_printf(sc->dev, "Could not acquire PHY for wakeup\n");
		goto out;
	}

	error = e1000_enable_phy_wakeup_reg_access_bm(hw, &wuc_enable);
	if (error != E1000_SUCCESS)
		goto release;

	/* Wake status is RW1C and survives controller reset. */
	error = hw->phy.ops.write_reg_page(hw, BM_WUS, 0xffff);
	if (error != E1000_SUCCESS)
		goto restore;

	/* copy MAC MTA to PHY MTA */
	for (int i = 0; i < hw->mac.mta_reg_count; i++) {
		mreg = E1000_READ_REG_ARRAY(hw, E1000_MTA, i);
		error = hw->phy.ops.write_reg_page(hw, BM_MTA(i),
		    (u16)(mreg & 0xffff));
		if (error != E1000_SUCCESS)
			goto restore;
		error = hw->phy.ops.write_reg_page(hw, BM_MTA(i) + 1,
		    (u16)(mreg >> 16));
		if (error != E1000_SUCCESS)
			goto restore;
	}

	/* configure PHY Rx Control register */
	error = hw->phy.ops.read_reg_page(hw, BM_RCTL, &preg);
	if (error != E1000_SUCCESS)
		goto restore;
	mreg = E1000_READ_REG(hw, E1000_RCTL);
	if (mreg & E1000_RCTL_UPE)
		preg |= BM_RCTL_UPE;
	if (mreg & E1000_RCTL_MPE)
		preg |= BM_RCTL_MPE;
	preg &= ~(BM_RCTL_MO_MASK);
	if (mreg & E1000_RCTL_MO_3)
		preg |= (((mreg & E1000_RCTL_MO_3) >> E1000_RCTL_MO_SHIFT)
				<< BM_RCTL_MO_SHIFT);
	if (mreg & E1000_RCTL_BAM)
		preg |= BM_RCTL_BAM;
	if (mreg & E1000_RCTL_PMCF)
		preg |= BM_RCTL_PMCF;
	mreg = E1000_READ_REG(hw, E1000_CTRL);
	if (mreg & E1000_CTRL_RFCE)
		preg |= BM_RCTL_RFCE;
	error = hw->phy.ops.write_reg_page(hw, BM_RCTL, preg);
	if (error != E1000_SUCCESS)
		goto restore;

	wuc = E1000_WUC_PME_EN;
	if ((wufc & (E1000_WUFC_MAG | E1000_WUFC_LNKC)) != 0)
		wuc |= E1000_WUC_APME;

	/* enable PHY wakeup in MAC register */
	E1000_WRITE_REG(hw, E1000_WUFC, wufc);
	E1000_WRITE_REG(hw, E1000_WUC, E1000_WUC_PHY_WAKE |
	    E1000_WUC_APMPME | E1000_WUC_PME_STATUS | wuc);

	/* configure and enable PHY wakeup in PHY registers */
	error = hw->phy.ops.write_reg_page(hw, BM_WUFC, wufc);
	if (error != E1000_SUCCESS)
		goto restore;
	error = hw->phy.ops.write_reg_page(hw, BM_WUC, wuc);
	if (error != E1000_SUCCESS)
		goto restore;

restore:
	/* Restore the page selector and expose only a complete setup. */
	if (error == E1000_SUCCESS)
		wuc_enable |= BM_WUC_ENABLE_BIT | BM_WUC_HOST_WU_BIT;
	else
		wuc_enable &= ~BM_WUC_HOST_WU_BIT;
	restore_error = e1000_disable_phy_wakeup_reg_access_bm(hw,
	    &wuc_enable);
	if (error == E1000_SUCCESS)
		error = restore_error;
release:
	hw->phy.ops.release(hw);
out:
	sc->wol_phy_armed = error == E1000_SUCCESS;
	if (error != E1000_SUCCESS)
		device_printf(sc->dev, "Could not configure PHY wakeup: %d\n",
		    error);

	return (error);
}

/* Clear host ownership and sticky status without disturbing ME wake. */
static int
em_disable_phy_wakeup(struct e1000_softc *sc, u16 *wus)
{
	struct e1000_hw *hw = &sc->hw;
	s32 error, restore_error;
	u16 phy_wus, wuc_enable;

	error = hw->phy.ops.acquire(hw);
	if (error != E1000_SUCCESS)
		return (error);
	error = e1000_enable_phy_wakeup_reg_access_bm(hw, &wuc_enable);
	if (error != E1000_SUCCESS)
		goto release;

	error = hw->phy.ops.read_reg_page(hw, BM_WUS, &phy_wus);
	if (error == E1000_SUCCESS)
		error = hw->phy.ops.write_reg_page(hw, BM_WUS, 0xffff);
	wuc_enable &= ~BM_WUC_HOST_WU_BIT;
	restore_error = e1000_disable_phy_wakeup_reg_access_bm(hw,
	    &wuc_enable);
	if (error == E1000_SUCCESS)
		error = restore_error;
release:
	hw->phy.ops.release(hw);
	if (error == E1000_SUCCESS) {
		sc->wol_phy_armed = false;
		if (wus != NULL)
			*wus = phy_wus;
	}
	return (error);
}

static void
em_if_led_func(if_ctx_t ctx, int onoff)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);

	if (onoff) {
		e1000_setup_led(&sc->hw);
		if (sc->hw.phy.media_type == e1000_media_type_internal_serdes)
			e1000_blink_led(&sc->hw);
		else
			e1000_led_on(&sc->hw);
	} else {
		e1000_led_off(&sc->hw);
		e1000_cleanup_led(&sc->hw);
	}
}

/*
 * Disable the L0S and L1 LINK states
 */
static void
em_disable_aspm(struct e1000_softc *sc)
{
	int base, reg;
	u16 link_cap,link_ctrl;
	device_t dev = sc->dev;

	switch (sc->hw.mac.type) {
	case e1000_82573:
	case e1000_82574:
	case e1000_82583:
		break;
	default:
		return;
	}
	if (pci_find_cap(dev, PCIY_EXPRESS, &base) != 0)
		return;
	reg = base + PCIER_LINK_CAP;
	link_cap = pci_read_config(dev, reg, 2);
	if ((link_cap & PCIEM_LINK_CAP_ASPM) == 0)
		return;
	reg = base + PCIER_LINK_CTL;
	link_ctrl = pci_read_config(dev, reg, 2);
	link_ctrl &= ~PCIEM_LINK_CTL_ASPMC;
	pci_write_config(dev, reg, link_ctrl, 2);
	return;
}

/**********************************************************************
 *
 *  Update the board statistics counters.
 *
 **********************************************************************/
void
em_update_stats_counters(struct e1000_softc *sc)
{
	struct e1000_hw_stats *stats;
	u64 prev_xoffrxc;

	if (sc->vf_ifp) {
		em_update_vf_stats_counters(sc);
		return;
	}

	stats = &sc->ustats.stats;
	prev_xoffrxc = stats->xoffrxc;

	if(sc->hw.phy.media_type == e1000_media_type_copper ||
	   (E1000_READ_REG(&sc->hw, E1000_STATUS) & E1000_STATUS_LU)) {
		stats->symerrs += E1000_READ_REG(&sc->hw, E1000_SYMERRS);
		stats->sec += E1000_READ_REG(&sc->hw, E1000_SEC);
	}
	stats->crcerrs += E1000_READ_REG(&sc->hw, E1000_CRCERRS);
	stats->mpc += E1000_READ_REG(&sc->hw, E1000_MPC);
	stats->scc += E1000_READ_REG(&sc->hw, E1000_SCC);
	stats->ecol += E1000_READ_REG(&sc->hw, E1000_ECOL);

	stats->mcc += E1000_READ_REG(&sc->hw, E1000_MCC);
	stats->latecol += E1000_READ_REG(&sc->hw, E1000_LATECOL);
	stats->colc += E1000_READ_REG(&sc->hw, E1000_COLC);
	stats->dc += E1000_READ_REG(&sc->hw, E1000_DC);
	stats->rlec += E1000_READ_REG(&sc->hw, E1000_RLEC);
	stats->xonrxc += E1000_READ_REG(&sc->hw, E1000_XONRXC);
	stats->xontxc += E1000_READ_REG(&sc->hw, E1000_XONTXC);
	stats->xoffrxc += E1000_READ_REG(&sc->hw, E1000_XOFFRXC);
	/*
	 ** For watchdog management we need to know if we have been
	 ** paused during the last interval, so capture that here.
	*/
	if (stats->xoffrxc != prev_xoffrxc)
		sc->shared->isc_pause_frames = 1;
	stats->xofftxc += E1000_READ_REG(&sc->hw, E1000_XOFFTXC);
	stats->fcruc += E1000_READ_REG(&sc->hw, E1000_FCRUC);
	stats->prc64 += E1000_READ_REG(&sc->hw, E1000_PRC64);
	stats->prc127 += E1000_READ_REG(&sc->hw, E1000_PRC127);
	stats->prc255 += E1000_READ_REG(&sc->hw, E1000_PRC255);
	stats->prc511 += E1000_READ_REG(&sc->hw, E1000_PRC511);
	stats->prc1023 += E1000_READ_REG(&sc->hw, E1000_PRC1023);
	stats->prc1522 += E1000_READ_REG(&sc->hw, E1000_PRC1522);
	stats->gprc += E1000_READ_REG(&sc->hw, E1000_GPRC);
	stats->bprc += E1000_READ_REG(&sc->hw, E1000_BPRC);
	stats->mprc += E1000_READ_REG(&sc->hw, E1000_MPRC);
	stats->gptc += E1000_READ_REG(&sc->hw, E1000_GPTC);

	/* For the 64-bit byte counters the low dword must be read first. */
	/* Both registers clear on the read of the high dword */

	stats->gorc += E1000_READ_REG(&sc->hw, E1000_GORCL) +
	    ((u64)E1000_READ_REG(&sc->hw, E1000_GORCH) << 32);
	stats->gotc += E1000_READ_REG(&sc->hw, E1000_GOTCL) +
	    ((u64)E1000_READ_REG(&sc->hw, E1000_GOTCH) << 32);

	stats->rnbc += E1000_READ_REG(&sc->hw, E1000_RNBC);
	stats->ruc += E1000_READ_REG(&sc->hw, E1000_RUC);
	stats->rfc += E1000_READ_REG(&sc->hw, E1000_RFC);
	stats->roc += E1000_READ_REG(&sc->hw, E1000_ROC);
	stats->rjc += E1000_READ_REG(&sc->hw, E1000_RJC);

	stats->mgprc += E1000_READ_REG(&sc->hw, E1000_MGTPRC);
	stats->mgpdc += E1000_READ_REG(&sc->hw, E1000_MGTPDC);
	stats->mgptc += E1000_READ_REG(&sc->hw, E1000_MGTPTC);

	stats->tor += E1000_READ_REG(&sc->hw, E1000_TORH);
	stats->tot += E1000_READ_REG(&sc->hw, E1000_TOTH);

	stats->tpr += E1000_READ_REG(&sc->hw, E1000_TPR);
	stats->tpt += E1000_READ_REG(&sc->hw, E1000_TPT);
	stats->ptc64 += E1000_READ_REG(&sc->hw, E1000_PTC64);
	stats->ptc127 += E1000_READ_REG(&sc->hw, E1000_PTC127);
	stats->ptc255 += E1000_READ_REG(&sc->hw, E1000_PTC255);
	stats->ptc511 += E1000_READ_REG(&sc->hw, E1000_PTC511);
	stats->ptc1023 += E1000_READ_REG(&sc->hw, E1000_PTC1023);
	stats->ptc1522 += E1000_READ_REG(&sc->hw, E1000_PTC1522);
	stats->mptc += E1000_READ_REG(&sc->hw, E1000_MPTC);
	stats->bptc += E1000_READ_REG(&sc->hw, E1000_BPTC);

	/* TLPIC and RLPIC are clear-on-read. */
	if (em_mac_has_eee(sc->hw.mac.type)) {
		stats->tlpic += E1000_READ_REG(&sc->hw, E1000_TLPIC);
		stats->rlpic += E1000_READ_REG(&sc->hw, E1000_RLPIC);
	}

	/* Interrupt Counts */

	stats->iac += E1000_READ_REG(&sc->hw, E1000_IAC);
	stats->icrxptc += E1000_READ_REG(&sc->hw, E1000_ICRXPTC);
	stats->icrxatc += E1000_READ_REG(&sc->hw, E1000_ICRXATC);
	stats->ictxptc += E1000_READ_REG(&sc->hw, E1000_ICTXPTC);
	stats->ictxatc += E1000_READ_REG(&sc->hw, E1000_ICTXATC);
	stats->ictxqec += E1000_READ_REG(&sc->hw, E1000_ICTXQEC);
	stats->ictxqmtc += E1000_READ_REG(&sc->hw, E1000_ICTXQMTC);
	stats->icrxdmtc += E1000_READ_REG(&sc->hw, E1000_ICRXDMTC);
	stats->icrxoc += E1000_READ_REG(&sc->hw, E1000_ICRXOC);

	if (sc->hw.mac.type >= e1000_82543) {
		stats->algnerrc +=
		E1000_READ_REG(&sc->hw, E1000_ALGNERRC);
		stats->rxerrc +=
		E1000_READ_REG(&sc->hw, E1000_RXERRC);
		stats->tncrs +=
		E1000_READ_REG(&sc->hw, E1000_TNCRS);
		stats->cexterr +=
		E1000_READ_REG(&sc->hw, E1000_CEXTERR);
		stats->tsctc +=
		E1000_READ_REG(&sc->hw, E1000_TSCTC);
		stats->tsctfc +=
		E1000_READ_REG(&sc->hw, E1000_TSCTFC);
	}

	if (em_has_82571_ecc_stats(&sc->hw))
		em_update_82571_ecc_stats(sc);
	else if (em_has_pch_ecc(&sc->hw))
		em_update_pch_ecc_stats(sc,
		    E1000_READ_REG(&sc->hw, E1000_PBECCSTS));
	else if (em_has_82575_memory_errors(&sc->hw))
		em_update_82575_ecc_stats(sc,
		    E1000_READ_REG(&sc->hw, E1000_PBECCSTS_82575),
		    E1000_READ_REG(&sc->hw, E1000_RDHESTS_82575),
		    E1000_READ_REG(&sc->hw, E1000_TDHESTS_82575));
	else if (em_has_82576_memory_errors(&sc->hw))
		em_update_82576_ecc_stats(sc);
	else if (em_has_82580_memory_errors(&sc->hw))
		em_update_82580_ecc_stats(sc,
		    E1000_READ_REG(&sc->hw, E1000_RPBECCSTS),
		    E1000_READ_REG(&sc->hw, E1000_TPBECCSTS),
		    E1000_READ_REG(&sc->hw, E1000_PCIEECCSTS));
	else if (em_has_i350_i354_memory_errors(&sc->hw))
		em_update_i350_i354_ecc_stats(sc);
	else if (em_has_i210_memory_errors(&sc->hw))
		em_update_i210_ecc_stats(sc);
}

static bool
em_mac_has_eee(enum e1000_mac_type type)
{

	return ((type >= e1000_pch2lan && type < e1000_82575) ||
	    (type >= e1000_i350 && type <= e1000_i211));
}

static void
em_initialize_vf_stats(struct e1000_softc *sc)
{
	struct e1000_vf_stats *stats;

	stats = &sc->ustats.vf_stats;
	*stats = (struct e1000_vf_stats){};
	em_rebase_vf_stats(sc);
}

static void
em_rebase_vf_stats(struct e1000_softc *sc)
{
	struct e1000_vf_stats *stats;

	/*
	 * A PF reset starts a new VF counter epoch.  Preserve the accumulated
	 * totals while establishing a new raw baseline so the reset is not
	 * mistaken for a 32-bit wrap.
	 */
	stats = &sc->ustats.vf_stats;
#define INIT_VF_REG(reg, name) do {					\
	stats->last_##name = E1000_READ_REG(&sc->hw, reg);		\
} while (0)
	INIT_VF_REG(E1000_VFGPRC, gprc);
	INIT_VF_REG(E1000_VFGORC, gorc);
	INIT_VF_REG(E1000_VFGPTC, gptc);
	INIT_VF_REG(E1000_VFGOTC, gotc);
	/*
	 * I350 specification update erratum 31 says VFMPRC is not
	 * accessible from VF memory.  The 0xf3c register remains valid on
	 * 82576 VFs, but must not be read on vfadapt_i350.
	 */
	if (sc->hw.mac.type == e1000_vfadapt)
		INIT_VF_REG(E1000_VFMPRC, mprc);
	else
		stats->last_mprc = 0;
	INIT_VF_REG(E1000_VFGOTLBC, gotlbc);
	INIT_VF_REG(E1000_VFGPTLBC, gptlbc);
	INIT_VF_REG(E1000_VFGORLBC, gorlbc);
	INIT_VF_REG(E1000_VFGPRLBC, gprlbc);
#undef INIT_VF_REG
}

static void
em_update_vf_stats_counters(struct e1000_softc *sc)
{
	struct e1000_vf_stats *stats;

	stats = &sc->ustats.vf_stats;

	/*
	 * Internal VF loopback traffic can continue without physical link,
	 * so sample the counters regardless of link state.
	 */
	UPDATE_VF_REG(E1000_VFGPRC,
	    stats->last_gprc, stats->gprc);
	UPDATE_VF_REG(E1000_VFGORC,
	    stats->last_gorc, stats->gorc);
	UPDATE_VF_REG(E1000_VFGPTC,
	    stats->last_gptc, stats->gptc);
	UPDATE_VF_REG(E1000_VFGOTC,
	    stats->last_gotc, stats->gotc);
	if (sc->hw.mac.type == e1000_vfadapt)
		UPDATE_VF_REG(E1000_VFMPRC,
		    stats->last_mprc, stats->mprc);
	UPDATE_VF_REG(E1000_VFGOTLBC,
	    stats->last_gotlbc, stats->gotlbc);
	UPDATE_VF_REG(E1000_VFGPTLBC,
	    stats->last_gptlbc, stats->gptlbc);
	UPDATE_VF_REG(E1000_VFGORLBC,
	    stats->last_gorlbc, stats->gorlbc);
	UPDATE_VF_REG(E1000_VFGPRLBC,
	    stats->last_gprlbc, stats->gprlbc);
}

static uint64_t
em_if_get_vf_counter(if_ctx_t ctx, ift_counter cnt)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	if_t ifp = iflib_get_ifp(ctx);

	switch (cnt) {
	case IFCOUNTER_IERRORS:
		return sc->dropped_pkts;
	default:
		return (if_get_counter_default(ifp, cnt));
	}
}

static uint64_t
em_if_get_counter(if_ctx_t ctx, ift_counter cnt)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw_stats *stats;
	if_t ifp = iflib_get_ifp(ctx);

	if (sc->vf_ifp)
		return (em_if_get_vf_counter(ctx, cnt));

	stats = &sc->ustats.stats;

	switch (cnt) {
	case IFCOUNTER_COLLISIONS:
		return (stats->colc);
	case IFCOUNTER_IERRORS:
		return (sc->dropped_pkts + stats->rxerrc +
		    stats->crcerrs + stats->algnerrc +
		    stats->ruc + stats->roc +
		    stats->mpc + stats->cexterr);
	case IFCOUNTER_OERRORS:
		return (if_get_counter_default(ifp, cnt) +
		    stats->ecol + stats->latecol);
	default:
		return (if_get_counter_default(ifp, cnt));
	}
}

/* em_if_needs_restart - Tell iflib when the driver needs to be reinitialized
 * @ctx: iflib context
 * @event: event code to check
 *
 * Defaults to returning false for unknown events.
 *
 * @returns true if iflib needs to reinit the interface
 */
static bool
em_if_needs_restart(if_ctx_t ctx __unused, enum iflib_restart_event event)
{
	switch (event) {
	case IFLIB_RESTART_VLAN_CONFIG:
	default:
		return (false);
	}
}

/* Export a single 32-bit register via a read-only sysctl. */
static int
em_sysctl_reg_handler(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc;
	u_int val;

	sc = oidp->oid_arg1;
	val = E1000_READ_REG(&sc->hw, oidp->oid_arg2);
	return (sysctl_handle_int(oidp, &val, 0, req));
}

enum em_ring_register {
	EM_RING_HEAD,
	EM_RING_TAIL,
};

/* Queue register addresses can change when the PF enters IOV mode. */
static int
em_sysctl_tx_ring_handler(SYSCTL_HANDLER_ARGS)
{
	struct tx_ring *txr;
	u_int reg, val;

	txr = oidp->oid_arg1;
	reg = oidp->oid_arg2 == EM_RING_HEAD ? E1000_TDH(txr->me) :
	    E1000_TDT(txr->me);
	val = E1000_READ_REG(&txr->sc->hw, reg);
	return (sysctl_handle_int(oidp, &val, 0, req));
}

static int
em_sysctl_rx_ring_handler(SYSCTL_HANDLER_ARGS)
{
	struct rx_ring *rxr;
	u_int reg, val;

	rxr = oidp->oid_arg1;
	reg = oidp->oid_arg2 == EM_RING_HEAD ? E1000_RDH(rxr->me) :
	    E1000_RDT(rxr->me);
	val = E1000_READ_REG(&rxr->sc->hw, reg);
	return (sysctl_handle_int(oidp, &val, 0, req));
}

/* Per queue holdoff interrupt rate handler */
static int
em_sysctl_interrupt_rate_handler(SYSCTL_HANDLER_ARGS)
{
	struct em_rx_queue *rque;
	struct em_tx_queue *tque;
	struct e1000_hw *hw;
	int error;
	u32 reg, usec, rate;

	bool tx = oidp->oid_arg2;

	if (tx) {
		tque = oidp->oid_arg1;
		hw = &tque->sc->hw;
		if (hw->mac.type >= igb_mac_min)
			reg = E1000_READ_REG(hw, E1000_EITR(tque->msix));
		else if (hw->mac.type == e1000_82574 &&
		    tque->sc->intr_type == IFLIB_INTR_MSIX)
			reg = E1000_READ_REG(hw, E1000_EITR_82574(tque->msix));
		else
			reg = E1000_READ_REG(hw, E1000_ITR);
	} else {
		rque = oidp->oid_arg1;
		hw = &rque->sc->hw;
		if (hw->mac.type >= igb_mac_min)
			reg = E1000_READ_REG(hw, E1000_EITR(rque->msix));
		else if (hw->mac.type == e1000_82574 &&
		    rque->sc->intr_type == IFLIB_INTR_MSIX)
			reg = E1000_READ_REG(hw,
			    E1000_EITR_82574(rque->msix));
		else
			reg = E1000_READ_REG(hw, E1000_ITR);
	}

	if (hw->mac.type < igb_mac_min) {
		if (reg > 0)
			rate = EM_INTS_TO_ITR(reg);
		else
			rate = 0;
	} else {
		usec = (reg & IGB_QVECTOR_MASK);
		if (usec > 0)
			rate = IGB_EITR_TO_INTS(usec);
		else
			rate = 0;
	}

	error = sysctl_handle_int(oidp, &rate, 0, req);
	if (error || !req->newptr)
		return error;
	return 0;
}

/*
 * Add sysctl variables, one per statistic, to the system.
 */
static void
em_add_hw_stats(struct e1000_softc *sc)
{
	device_t dev = iflib_get_dev(sc->ctx);
	struct em_tx_queue *tx_que = sc->tx_queues;
	struct em_rx_queue *rx_que = sc->rx_queues;

	struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
	struct sysctl_oid *tree = device_get_sysctl_tree(dev);
	struct sysctl_oid_list *child = SYSCTL_CHILDREN(tree);
	struct e1000_hw_stats *stats;

	struct sysctl_oid *stat_node, *queue_node, *int_node;
	struct sysctl_oid_list *stat_list, *queue_list, *int_list;

#define QUEUE_NAME_LEN 32
	char namebuf[QUEUE_NAME_LEN];

	/* Driver Statistics */
	SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "dropped",
	    CTLFLAG_RD, &sc->dropped_pkts,
	    "Driver dropped packets");
	SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "link_irq",
	    CTLFLAG_RD, &sc->link_irq,
	    "Link MSI-X IRQ Handled");
	SYSCTL_ADD_ULONG(ctx, child, OID_AUTO, "rx_overruns",
	    CTLFLAG_RD, &sc->rx_overruns,
	    "RX overruns");
	if (!sc->vf_ifp) {
		SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "device_control",
		    CTLTYPE_UINT | CTLFLAG_RD,
		    sc, E1000_CTRL, em_sysctl_reg_handler, "IU",
		    "Device Control Register");
		SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_control",
		    CTLTYPE_UINT | CTLFLAG_RD,
		    sc, E1000_RCTL, em_sysctl_reg_handler, "IU",
		    "Receiver Control Register");
		SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "fc_high_water",
		    CTLFLAG_RD, &sc->hw.fc.high_water, 0,
		    "Flow Control High Watermark");
		SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "fc_low_water",
		    CTLFLAG_RD, &sc->hw.fc.low_water, 0,
		    "Flow Control Low Watermark");
	}

	for (int i = 0; i < sc->tx_num_queues; i++, tx_que++) {
		struct tx_ring *txr = &tx_que->txr;
		snprintf(namebuf, QUEUE_NAME_LEN, "queue_tx_%d", i);
		queue_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
		    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "TX Queue Name");
		queue_list = SYSCTL_CHILDREN(queue_node);

		SYSCTL_ADD_PROC(ctx, queue_list, OID_AUTO, "interrupt_rate",
		    CTLTYPE_UINT | CTLFLAG_RD, tx_que,
		    true, em_sysctl_interrupt_rate_handler,
		    "IU", "Interrupt Rate");

		SYSCTL_ADD_PROC(ctx, queue_list, OID_AUTO, "txd_head",
		    CTLTYPE_UINT | CTLFLAG_RD, txr, EM_RING_HEAD,
		    em_sysctl_tx_ring_handler, "IU",
		    "Transmit Descriptor Head");
		SYSCTL_ADD_PROC(ctx, queue_list, OID_AUTO, "txd_tail",
		    CTLTYPE_UINT | CTLFLAG_RD, txr, EM_RING_TAIL,
		    em_sysctl_tx_ring_handler, "IU",
		    "Transmit Descriptor Tail");
		SYSCTL_ADD_ULONG(ctx, queue_list, OID_AUTO, "tx_irq",
		    CTLFLAG_RD, &txr->tx_irq,
		    "Queue MSI-X Transmit Interrupts");
	}

	for (int j = 0; j < sc->rx_num_queues; j++, rx_que++) {
		struct rx_ring *rxr = &rx_que->rxr;
		snprintf(namebuf, QUEUE_NAME_LEN, "queue_rx_%d", j);
		queue_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
		    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "RX Queue Name");
		queue_list = SYSCTL_CHILDREN(queue_node);

		SYSCTL_ADD_PROC(ctx, queue_list, OID_AUTO, "interrupt_rate",
		    CTLTYPE_UINT | CTLFLAG_RD, rx_que,
		    false, em_sysctl_interrupt_rate_handler,
		    "IU", "Interrupt Rate");

		SYSCTL_ADD_PROC(ctx, queue_list, OID_AUTO, "rxd_head",
		    CTLTYPE_UINT | CTLFLAG_RD, rxr, EM_RING_HEAD,
		    em_sysctl_rx_ring_handler, "IU",
		    "Receive Descriptor Head");
		SYSCTL_ADD_PROC(ctx, queue_list, OID_AUTO, "rxd_tail",
		    CTLTYPE_UINT | CTLFLAG_RD, rxr, EM_RING_TAIL,
		    em_sysctl_rx_ring_handler, "IU",
		    "Receive Descriptor Tail");
		SYSCTL_ADD_ULONG(ctx, queue_list, OID_AUTO, "rx_irq",
		    CTLFLAG_RD, &rxr->rx_irq,
		    "Queue MSI-X Receive Interrupts");
	}

	/* MAC stats get their own sub node */
	stat_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "mac_stats",
	    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Statistics");
	stat_list = SYSCTL_CHILDREN(stat_node);

	/*
	** VF adapter has a very limited set of stats
	** since its not managing the metal, so to speak.
	*/
	if (sc->vf_ifp) {
		struct e1000_vf_stats *vfstats = &sc->ustats.vf_stats;

		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO, "good_pkts_recvd",
		    CTLFLAG_RD, &vfstats->gprc,
		    "Good Packets Received");
		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO, "good_pkts_txd",
		    CTLFLAG_RD, &vfstats->gptc,
		    "Good Packets Transmitted");
		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO, "good_octets_recvd",
		    CTLFLAG_RD, &vfstats->gorc,
		    "Good Octets Received");
		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO, "good_octets_txd",
		    CTLFLAG_RD, &vfstats->gotc,
		    "Good Octets Transmitted");
		if (sc->hw.mac.type == e1000_vfadapt) {
			SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO,
			    "mcast_pkts_recvd", CTLFLAG_RD, &vfstats->mprc,
			    "Multicast Packets Received");
		}
		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO,
		    "loopback_good_pkts_recvd",
		    CTLFLAG_RD, &vfstats->gprlbc,
		    "Good Loopback Packets Received");
		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO,
		    "loopback_good_pkts_txd",
		    CTLFLAG_RD, &vfstats->gptlbc,
		    "Good Loopback Packets Transmitted");
		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO,
		    "loopback_good_octets_recvd",
		    CTLFLAG_RD, &vfstats->gorlbc,
		    "Good Loopback Octets Received");
		SYSCTL_ADD_QUAD(ctx, stat_list, OID_AUTO,
		    "loopback_good_octets_txd",
		    CTLFLAG_RD, &vfstats->gotlbc,
		    "Good Loopback Octets Transmitted");
		SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO,
		    "rx_csum_offload_good",
		    CTLFLAG_RD, &sc->rx_csum_good,
		    "Receive Checksum Offload Successes");
		SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO,
		    "rx_csum_offload_errors",
		    CTLFLAG_RD, &sc->rx_csum_errors,
		    "Receive Checksum Offload Errors");
		return;
	}

	stats = &sc->ustats.stats;
	if (em_mac_has_eee(sc->hw.mac.type)) {
		struct sysctl_oid *eee_node;
		struct sysctl_oid_list *eee_list;

		eee_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "eee",
		    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
		    "Energy Efficient Ethernet statistics");
		eee_list = SYSCTL_CHILDREN(eee_node);
		SYSCTL_ADD_UQUAD(ctx, eee_list, OID_AUTO, "tx_lpi_count",
		    CTLFLAG_RD, &stats->tlpic, "TX LPI event count");
		SYSCTL_ADD_UQUAD(ctx, eee_list, OID_AUTO, "rx_lpi_count",
		    CTLFLAG_RD, &stats->rlpic, "RX LPI event count");
	}
	if (em_has_memory_error_stats(&sc->hw)) {
		struct sysctl_oid *memerr_node;
		struct sysctl_oid_list *memerr_list;

		memerr_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO,
		    "memory_errors", CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
		    "Internal memory error indications");
		memerr_list = SYSCTL_CHILDREN(memerr_node);
		if (em_has_memory_errors(&sc->hw))
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "fatal_resets", CTLFLAG_RD,
			    &sc->fatal_error_reset_count,
			    "Resets requested for fatal internal memory errors");
		if (em_has_82571_ecc_stats(&sc->hw)) {
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "detected_packet_buffer", CTLFLAG_RD,
			    &sc->corrected_error_packet_buffer_count,
			    "Detected packet-buffer ECC errors");
		} else if (em_has_pch_ecc(&sc->hw)) {
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_packet_buffer", CTLFLAG_RD,
			    &sc->corrected_error_packet_buffer_count,
			    "Corrected packet-buffer ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "uncorrected_packet_buffer", CTLFLAG_RD,
			    &sc->uncorrected_error_packet_buffer_count,
			    "Uncorrected packet-buffer ECC errors");
		} else if (em_has_82575_memory_errors(&sc->hw)) {
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_packet_buffer", CTLFLAG_RD,
			    &sc->corrected_error_packet_buffer_count,
			    "Corrected packet-buffer ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "uncorrected_packet_buffer", CTLFLAG_RD,
			    &sc->uncorrected_error_packet_buffer_count,
			    "Uncorrected packet-buffer ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_descriptor_handler", CTLFLAG_RD,
			    &sc->corrected_error_dma_count,
			    "Corrected descriptor-handler ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "uncorrected_descriptor_handler", CTLFLAG_RD,
			    &sc->uncorrected_error_dma_count,
			    "Uncorrected descriptor-handler ECC errors");
		} else if (em_has_82576_memory_errors(&sc->hw)) {
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "fatal_unknown", CTLFLAG_RD,
			    &sc->fatal_error_unknown_count,
			    "Fatal memory errors without a reported source");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_packet_buffer", CTLFLAG_RD,
			    &sc->corrected_error_packet_buffer_count,
			    "Corrected packet and switch-buffer ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "uncorrected_packet_buffer", CTLFLAG_RD,
			    &sc->uncorrected_error_packet_buffer_count,
			    "Uncorrected packet and switch-buffer ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_descriptor_handler", CTLFLAG_RD,
			    &sc->corrected_error_dma_count,
			    "Corrected descriptor-handler ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "uncorrected_descriptor_handler", CTLFLAG_RD,
			    &sc->uncorrected_error_dma_count,
			    "Uncorrected descriptor-handler ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_pcie_write_buffer", CTLFLAG_RD,
			    &sc->corrected_error_pcie_tx_data_count,
			    "Corrected PCIe write-buffer ECC errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_pcie_retry_buffer", CTLFLAG_RD,
			    &sc->corrected_error_pcie_retry_count,
			    "Corrected controller-shared PCIe retry-buffer errors");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "corrected_pcie_msix", CTLFLAG_RD,
			    &sc->corrected_error_pcie_other_count,
			    "Corrected controller-shared PCIe MSI-X errors");
		} else {
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "fatal_lan", CTLFLAG_RD,
			    &sc->fatal_error_lan_count,
			    "Fatal LAN-port memory error indications");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "fatal_management", CTLFLAG_RD,
			    &sc->fatal_error_mng_count,
			    "Fatal management-memory error indications");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "fatal_pcie", CTLFLAG_RD,
			    &sc->fatal_error_pcie_count,
			    "Fatal PCIe memory error indications");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "fatal_dma", CTLFLAG_RD,
			    &sc->fatal_error_dma_count,
			    "Fatal DMA memory error indications");
			SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
			    "fatal_unknown", CTLFLAG_RD,
			    &sc->fatal_error_unknown_count,
			    "Fatal memory errors without a reported region");
			if (em_has_82580_memory_errors(&sc->hw)) {
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_packet_buffer", CTLFLAG_RD,
				    &sc->corrected_error_packet_buffer_count,
				    "Corrected packet-buffer ECC errors");
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "uncorrected_pcie", CTLFLAG_RD,
				    &sc->uncorrected_error_pcie_count,
				    "Uncorrected PCIe command-memory ECC indications");
			} else if (em_has_i210_memory_errors(&sc->hw)) {
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_dma", CTLFLAG_RD,
				    &sc->corrected_error_dma_count,
				    "Corrected DMA memory error indications");
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_pcie_tx_data", CTLFLAG_RD,
				    &sc->corrected_error_pcie_tx_data_count,
				    "Corrected PCIe transmit-data memory indications");
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_pcie_retry", CTLFLAG_RD,
				    &sc->corrected_error_pcie_retry_count,
				    "Corrected PCIe retry-buffer memory indications");
			} else {
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_dma", CTLFLAG_RD,
				    &sc->corrected_error_dma_count,
				    "Corrected DMA memory indications");
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_packet_buffer", CTLFLAG_RD,
				    &sc->corrected_error_packet_buffer_count,
				    "Corrected packet-buffer memory indications");
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_lan_mng_fifo", CTLFLAG_RD,
				    &sc->corrected_error_lan_mng_fifo_count,
				    "Corrected LAN management transmit-FIFO ECC "
				    "indications");
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_pcie_tx_data", CTLFLAG_RD,
				    &sc->corrected_error_pcie_tx_data_count,
				    "Corrected PCIe transmit-data memory indications");
				if (sc->hw.mac.type == e1000_i350)
					SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
					    "corrected_pcie_retry", CTLFLAG_RD,
					    &sc->corrected_error_pcie_retry_count,
					    "Corrected PCIe retry-buffer memory "
					    "indications");
				SYSCTL_ADD_UQUAD(ctx, memerr_list, OID_AUTO,
				    "corrected_pcie_other", CTLFLAG_RD,
				    &sc->corrected_error_pcie_other_count,
				    "Other corrected PCIe memory indications");
			}
		}
	}

	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "excess_coll",
	    CTLFLAG_RD, &stats->ecol,
	    "Excessive collisions");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "single_coll",
	    CTLFLAG_RD, &stats->scc,
	    "Single collisions");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "multiple_coll",
	    CTLFLAG_RD, &stats->mcc,
	    "Multiple collisions");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "late_coll",
	    CTLFLAG_RD, &stats->latecol,
	    "Late collisions");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "collision_count",
	    CTLFLAG_RD, &stats->colc,
	    "Collision Count");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "symbol_errors",
	    CTLFLAG_RD, &stats->symerrs,
	    "Symbol Errors");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "sequence_errors",
	    CTLFLAG_RD, &stats->sec,
	    "Sequence Errors");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "defer_count",
	    CTLFLAG_RD, &stats->dc,
	    "Defer Count");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "missed_packets",
	    CTLFLAG_RD, &stats->mpc,
	    "Missed Packets");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "recv_length_errors",
	    CTLFLAG_RD, &stats->rlec,
	    "Receive Length Errors");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "recv_no_buff",
	    CTLFLAG_RD, &stats->rnbc,
	    "Receive No Buffers");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "recv_undersize",
	    CTLFLAG_RD, &stats->ruc,
	    "Receive Undersize");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "recv_fragmented",
	    CTLFLAG_RD, &stats->rfc,
	    "Fragmented Packets Received ");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "recv_oversize",
	    CTLFLAG_RD, &stats->roc,
	    "Oversized Packets Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "recv_jabber",
	    CTLFLAG_RD, &stats->rjc,
	    "Recevied Jabber");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "recv_errs",
	    CTLFLAG_RD, &stats->rxerrc,
	    "Receive Errors");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "crc_errs",
	    CTLFLAG_RD, &stats->crcerrs,
	    "CRC errors");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "alignment_errs",
	    CTLFLAG_RD, &stats->algnerrc,
	    "Alignment Errors");
	/* On 82575 these are collision counts */
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "coll_ext_errs",
	    CTLFLAG_RD, &stats->cexterr,
	    "Collision/Carrier extension errors");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "xon_recvd",
	    CTLFLAG_RD, &stats->xonrxc,
	    "XON Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "xon_txd",
	    CTLFLAG_RD, &stats->xontxc,
	    "XON Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "xoff_recvd",
	    CTLFLAG_RD, &stats->xoffrxc,
	    "XOFF Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "xoff_txd",
	    CTLFLAG_RD, &stats->xofftxc,
	    "XOFF Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "unsupported_fc_recvd",
	    CTLFLAG_RD, &stats->fcruc,
	    "Unsupported Flow Control Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "mgmt_pkts_recvd",
	    CTLFLAG_RD, &stats->mgprc,
	    "Management Packets Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "mgmt_pkts_drop",
	    CTLFLAG_RD, &stats->mgpdc,
	    "Management Packets Dropped");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "mgmt_pkts_txd",
	    CTLFLAG_RD, &stats->mgptc,
	    "Management Packets Transmitted");

	/* Packet Reception Stats */
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "total_pkts_recvd",
	    CTLFLAG_RD, &stats->tpr,
	    "Total Packets Received ");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "good_pkts_recvd",
	    CTLFLAG_RD, &stats->gprc,
	    "Good Packets Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "bcast_pkts_recvd",
	    CTLFLAG_RD, &stats->bprc,
	    "Broadcast Packets Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "mcast_pkts_recvd",
	    CTLFLAG_RD, &stats->mprc,
	    "Multicast Packets Received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rx_frames_64",
	    CTLFLAG_RD, &stats->prc64,
	    "64 byte frames received ");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rx_frames_65_127",
	    CTLFLAG_RD, &stats->prc127,
	    "65-127 byte frames received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rx_frames_128_255",
	    CTLFLAG_RD, &stats->prc255,
	    "128-255 byte frames received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rx_frames_256_511",
	    CTLFLAG_RD, &stats->prc511,
	    "256-511 byte frames received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rx_frames_512_1023",
	    CTLFLAG_RD, &stats->prc1023,
	    "512-1023 byte frames received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "rx_frames_1024_1522",
	    CTLFLAG_RD, &stats->prc1522,
	    "1023-1522 byte frames received");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "good_octets_recvd",
	    CTLFLAG_RD, &stats->gorc,
	    "Good Octets Received");

	/* Packet Transmission Stats */
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "good_octets_txd",
	    CTLFLAG_RD, &stats->gotc,
	    "Good Octets Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "total_pkts_txd",
	    CTLFLAG_RD, &stats->tpt,
	    "Total Packets Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "good_pkts_txd",
	    CTLFLAG_RD, &stats->gptc,
	    "Good Packets Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "bcast_pkts_txd",
	    CTLFLAG_RD, &stats->bptc,
	    "Broadcast Packets Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "mcast_pkts_txd",
	    CTLFLAG_RD, &stats->mptc,
	    "Multicast Packets Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tx_frames_64",
	    CTLFLAG_RD, &stats->ptc64,
	    "64 byte frames transmitted ");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tx_frames_65_127",
	    CTLFLAG_RD, &stats->ptc127,
	    "65-127 byte frames transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tx_frames_128_255",
	    CTLFLAG_RD, &stats->ptc255,
	    "128-255 byte frames transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tx_frames_256_511",
	    CTLFLAG_RD, &stats->ptc511,
	    "256-511 byte frames transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tx_frames_512_1023",
	    CTLFLAG_RD, &stats->ptc1023,
	    "512-1023 byte frames transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tx_frames_1024_1522",
	    CTLFLAG_RD, &stats->ptc1522,
	    "1024-1522 byte frames transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tso_txd",
	    CTLFLAG_RD, &stats->tsctc,
	    "TSO Contexts Transmitted");
	SYSCTL_ADD_UQUAD(ctx, stat_list, OID_AUTO, "tso_ctx_fail",
	    CTLFLAG_RD, &stats->tsctfc,
	    "TSO Contexts Failed");

	/* Interrupt Stats */
	int_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "interrupts",
	    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Interrupt Statistics");
	int_list = SYSCTL_CHILDREN(int_node);

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "asserts",
	    CTLFLAG_RD, &stats->iac,
	    "Interrupt Assertion Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "rx_pkt_timer",
	    CTLFLAG_RD, &stats->icrxptc,
	    "Interrupt Cause Rx Pkt Timer Expire Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "rx_abs_timer",
	    CTLFLAG_RD, &stats->icrxatc,
	    "Interrupt Cause Rx Abs Timer Expire Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "tx_pkt_timer",
	    CTLFLAG_RD, &stats->ictxptc,
	    "Interrupt Cause Tx Pkt Timer Expire Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "tx_abs_timer",
	    CTLFLAG_RD, &stats->ictxatc,
	    "Interrupt Cause Tx Abs Timer Expire Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "tx_queue_empty",
	    CTLFLAG_RD, &stats->ictxqec,
	    "Interrupt Cause Tx Queue Empty Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "tx_queue_min_thresh",
	    CTLFLAG_RD, &stats->ictxqmtc,
	    "Interrupt Cause Tx Queue Min Thresh Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "rx_desc_min_thresh",
	    CTLFLAG_RD, &stats->icrxdmtc,
	    "Interrupt Cause Rx Desc Min Thresh Count");

	SYSCTL_ADD_UQUAD(ctx, int_list, OID_AUTO, "rx_overrun",
	    CTLFLAG_RD, &stats->icrxoc,
	    "Interrupt Cause Receiver Overrun Count");
}

static void
em_fw_version_locked(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	struct e1000_fw_version *fw_ver = &sc->fw_ver;
	uint16_t eep = 0;

	/*
	 * em_fw_version_locked() must run under the IFLIB_CTX_LOCK to meet
	 * the NVM locking model, so we do it in em_if_attach_pre() and store
	 * the info in the softc
	 */
	ASSERT_CTX_LOCK_HELD(hw);

	*fw_ver = (struct e1000_fw_version){0};

	if (hw->mac.type >= igb_mac_min) {
		/*
		 * Use the Shared Code for igb(4)
		 */
		e1000_get_fw_version(hw, fw_ver);
	} else {
		/*
		 * Otherwise, EEPROM version should be present on (almost?)
		 * all devices here
		 */
		if(e1000_read_nvm(hw, NVM_VERSION, 1, &eep)) {
			INIT_DEBUGOUT("can't get EEPROM version");
			return;
		}

		fw_ver->eep_major = (eep & NVM_MAJOR_MASK) >> NVM_MAJOR_SHIFT;
		fw_ver->eep_minor = (eep & NVM_MINOR_MASK) >> NVM_MINOR_SHIFT;
		fw_ver->eep_build = (eep & NVM_IMAGE_ID_MASK);
	}
}

static void
em_sbuf_fw_version(struct e1000_fw_version *fw_ver, struct sbuf *buf)
{
	const char *space = "";

	if (fw_ver->eep_major || fw_ver->eep_minor || fw_ver->eep_build) {
		sbuf_printf(buf, "EEPROM V%d.%d-%d", fw_ver->eep_major,
			    fw_ver->eep_minor, fw_ver->eep_build);
		space = " ";
	}

	if (fw_ver->invm_major || fw_ver->invm_minor ||
	    fw_ver->invm_img_type) {
		sbuf_printf(buf, "%sNVM V%d.%d imgtype%d",
		    space, fw_ver->invm_major, fw_ver->invm_minor,
		    fw_ver->invm_img_type);
		space = " ";
	}

	if (fw_ver->or_valid) {
		sbuf_printf(buf, "%sOption ROM V%d-b%d-p%d",
		    space, fw_ver->or_major, fw_ver->or_build,
		    fw_ver->or_patch);
		space = " ";
	}

	if (fw_ver->etrack_id)
		sbuf_printf(buf, "%seTrack 0x%08x", space, fw_ver->etrack_id);
}

static void
em_print_fw_version(struct e1000_softc *sc )
{
	device_t dev = sc->dev;
	struct sbuf *buf;
	int error = 0;

	buf = sbuf_new_auto();
	if (!buf) {
		device_printf(dev, "Could not allocate sbuf for output.\n");
		return;
	}

	em_sbuf_fw_version(&sc->fw_ver, buf);

	error = sbuf_finish(buf);
	if (error)
		device_printf(dev, "Error finishing sbuf: %d\n", error);
	else if (sbuf_len(buf))
		device_printf(dev, "%s\n", sbuf_data(buf));

	sbuf_delete(buf);
}

static int
em_sysctl_print_fw_version(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc = (struct e1000_softc *)arg1;
	device_t dev = sc->dev;
	struct sbuf *buf;
	int error = 0;

	buf = sbuf_new_for_sysctl(NULL, NULL, 128, req);
	if (!buf) {
		device_printf(dev, "Could not allocate sbuf for output.\n");
		return (ENOMEM);
	}

	em_sbuf_fw_version(&sc->fw_ver, buf);

	error = sbuf_finish(buf);
	if (error)
		device_printf(dev, "Error finishing sbuf: %d\n", error);

	sbuf_delete(buf);

	return (0);
}

/**********************************************************************
 *
 *  This routine provides a way to dump out the adapter eeprom,
 *  often a useful debug/service tool. This only dumps the first
 *  32 words, stuff that matters is in that extent.
 *
 **********************************************************************/
static int
em_sysctl_nvm_info(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc = (struct e1000_softc *)arg1;
	int error;
	int result;

	result = -1;
	error = sysctl_handle_int(oidp, &result, 0, req);

	if (error || !req->newptr)
		return (error);

	/*
	 * This value will cause a hex dump of the
	 * first 32 16-bit words of the EEPROM to
	 * the screen.
	 */
	if (result == 1)
		em_print_nvm_info(sc);

	return (error);
}

static void
em_print_nvm_info(struct e1000_softc *sc)
{
	struct e1000_hw *hw = &sc->hw;
	struct sx *iflib_ctx_lock = iflib_ctx_lock_get(sc->ctx);
	u16 eeprom_data;
	int i, j, row = 0;

	/* Its a bit crude, but it gets the job done */
	printf("\nInterface EEPROM Dump:\n");
	printf("Offset\n0x0000  ");

	/* We rely on the IFLIB_CTX_LOCK as part of NVM locking model */
	sx_xlock(iflib_ctx_lock);
	ASSERT_CTX_LOCK_HELD(hw);
	for (i = 0, j = 0; i < 32; i++, j++) {
		if (j == 8) { /* Make the offset block */
			j = 0; ++row;
			printf("\n0x00%x0  ",row);
		}
		eeprom_data = 0;
		if (e1000_read_nvm(hw, i, 1, &eeprom_data) !=
		    E1000_SUCCESS) {
			printf("\nNVM read failed at offset %#x\n", i);
			break;
		}
		printf("%04x ", eeprom_data);
	}
	sx_xunlock(iflib_ctx_lock);
	printf("\n");
}

static int
em_sysctl_int_delay(SYSCTL_HANDLER_ARGS)
{
	struct em_int_delay_info *info;
	struct e1000_softc *sc;
	u32 regval;
	int error, usecs, ticks;

	info = (struct em_int_delay_info *) arg1;
	usecs = info->value;
	error = sysctl_handle_int(oidp, &usecs, 0, req);
	if (error != 0 || req->newptr == NULL)
		return (error);
	if (usecs < 0 || usecs > EM_TICKS_TO_USECS(65535))
		return (EINVAL);
	info->value = usecs;
	ticks = EM_USECS_TO_TICKS(usecs);

	sc = info->sc;

	regval = E1000_READ_OFFSET(&sc->hw, info->offset);
	regval = (regval & ~0xffff) | (ticks & 0xffff);
	/* Handle a few special cases. */
	switch (info->offset) {
	case E1000_RDTR:
		break;
	case E1000_TIDV:
		if (ticks == 0) {
			sc->txd_cmd &= ~E1000_TXD_CMD_IDE;
			/* Don't write 0 into the TIDV register. */
			regval++;
		} else
			sc->txd_cmd |= E1000_TXD_CMD_IDE;
		break;
	}
	E1000_WRITE_OFFSET(&sc->hw, info->offset, regval);
	return (0);
}

static int
em_sysctl_tso_tcp_flags_mask(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc;
	u32 reg, val, shift;
	int error, mask;

	sc = oidp->oid_arg1;
	switch (oidp->oid_arg2) {
	case 0:
		reg = E1000_DTXTCPFLGL;
		shift = 0;
		break;
	case 1:
		reg = E1000_DTXTCPFLGL;
		shift = 16;
		break;
	case 2:
		reg = E1000_DTXTCPFLGH;
		shift = 0;
		break;
	default:
		return (EINVAL);
		break;
	}
	val = E1000_READ_REG(&sc->hw, reg);
	mask = (val >> shift) & 0xfff;
	error = sysctl_handle_int(oidp, &mask, 0, req);
	if (error != 0 || req->newptr == NULL)
		return (error);
	if (mask < 0 || mask > 0xfff)
		return (EINVAL);
	val = (val & ~(0xfff << shift)) | (mask << shift);
	E1000_WRITE_REG(&sc->hw, reg, val);
	return (0);
}

static void
em_add_int_delay_sysctl(struct e1000_softc *sc, const char *name,
    const char *description, struct em_int_delay_info *info, int offset,
    int value)
{
	info->sc = sc;
	info->offset = offset;
	info->value = value;
	SYSCTL_ADD_PROC(device_get_sysctl_ctx(sc->dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)),
	    OID_AUTO, name, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
	    info, 0, em_sysctl_int_delay, "I", description);
}

/*
 * Set flow control using sysctl:
 * Flow control values:
 *      0 - off
 *      1 - rx pause
 *      2 - tx pause
 *      3 - full
 */
static int
em_set_flowcntl(SYSCTL_HANDLER_ARGS)
{
	int error;
	static int input = 3; /* default is full */
	struct e1000_softc *sc = (struct e1000_softc *) arg1;

	error = sysctl_handle_int(oidp, &input, 0, req);

	if ((error) || (req->newptr == NULL))
		return (error);

	if (input == sc->fc) /* no change? */
		return (error);

	switch (input) {
	case e1000_fc_rx_pause:
	case e1000_fc_tx_pause:
	case e1000_fc_full:
	case e1000_fc_none:
		sc->hw.fc.requested_mode = input;
		sc->fc = input;
		break;
	default:
		/* Do nothing */
		return (error);
	}

	sc->hw.fc.current_mode = sc->hw.fc.requested_mode;
	e1000_force_mac_fc(&sc->hw);
	return (error);
}

static void
em_sysctl_request_reinit(struct e1000_softc *sc)
{
	if ((if_getflags(iflib_get_ifp(sc->ctx)) & IFF_UP) == 0)
		return;

	iflib_request_reset(sc->ctx);
	iflib_admin_intr_deferred(sc->ctx);
}

/*
 * Manage DMA Coalesce:
 * Control values:
 * 	0/1 - off/on
 *	Legal timer values are:
 *	250,500,1000-10000 in thousands
 */
static int
igb_sysctl_dmac(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc = (struct e1000_softc *) arg1;
	int error;

	error = sysctl_handle_int(oidp, &sc->dmac, 0, req);

	if ((error) || (req->newptr == NULL))
		return (error);

	switch (sc->dmac) {
		case 0:
			/* Disabling */
			break;
		case 1: /* Just enable and use default */
			sc->dmac = 1000;
			break;
		case 250:
		case 500:
		case 1000:
		case 2000:
		case 3000:
		case 4000:
		case 5000:
		case 6000:
		case 7000:
		case 8000:
		case 9000:
		case 10000:
			/* Legal values - allow */
			break;
		default:
			/* Do nothing, illegal value */
			sc->dmac = 0;
			return (EINVAL);
	}
	/* Reinit the interface */
	em_sysctl_request_reinit(sc);
	return (error);
}

/*
 * Manage Energy Efficient Ethernet:
 * Control values:
 *     0/1 - enabled/disabled
 */
static int
em_sysctl_eee(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc = (struct e1000_softc *) arg1;
	int error, value;

	if (sc->hw.mac.type < igb_mac_min)
		value = sc->hw.dev_spec.ich8lan.eee_disable;
	else
		value = sc->hw.dev_spec._82575.eee_disable;
	error = sysctl_handle_int(oidp, &value, 0, req);
	if (error || req->newptr == NULL)
		return (error);
	if (sc->hw.mac.type < igb_mac_min)
		sc->hw.dev_spec.ich8lan.eee_disable = (value != 0);
	else
		sc->hw.dev_spec._82575.eee_disable = (value != 0);
	em_sysctl_request_reinit(sc);

	return (0);
}

static int
em_sysctl_debug_info(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc;
	int error;
	int result;

	result = -1;
	error = sysctl_handle_int(oidp, &result, 0, req);

	if (error || !req->newptr)
		return (error);

	if (result == 1) {
		sc = (struct e1000_softc *) arg1;
		em_print_debug_info(sc);
	}

	return (error);
}

static int
em_get_rs(SYSCTL_HANDLER_ARGS)
{
	struct e1000_softc *sc = (struct e1000_softc *) arg1;
	int error;
	int result;

	result = 0;
	error = sysctl_handle_int(oidp, &result, 0, req);

	if (error || !req->newptr || result != 1)
		return (error);
	em_dump_rs(sc);

	return (error);
}

static void
em_if_debug(if_ctx_t ctx)
{
	em_dump_rs(iflib_get_softc(ctx));
}

/*
 * This routine is meant to be fluid, add whatever is
 * needed for debugging a problem.  -jfv
 */
static void
em_print_debug_info(struct e1000_softc *sc)
{
	device_t dev = iflib_get_dev(sc->ctx);
	if_t ifp = iflib_get_ifp(sc->ctx);
	struct tx_ring *txr;
	struct rx_ring *rxr;

	if (sc->tx_queues == NULL || sc->rx_queues == NULL) {
		device_printf(dev, "queue state is unavailable\n");
		return;
	}
	if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
		printf("Interface is RUNNING ");
	else
		printf("Interface is NOT RUNNING\n");

	if (if_getdrvflags(ifp) & IFF_DRV_OACTIVE)
		printf("and INACTIVE\n");
	else
		printf("and ACTIVE\n");

	for (int i = 0; i < sc->tx_num_queues; i++) {
		txr = &sc->tx_queues[i].txr;
		device_printf(dev, "TX Queue %d ------\n", i);
		device_printf(dev, "hw tdh = %d, hw tdt = %d\n",
		    E1000_READ_REG(&sc->hw, E1000_TDH(txr->me)),
		    E1000_READ_REG(&sc->hw, E1000_TDT(txr->me)));

	}
	for (int j = 0; j < sc->rx_num_queues; j++) {
		rxr = &sc->rx_queues[j].rxr;
		device_printf(dev, "RX Queue %d ------\n", j);
		device_printf(dev, "hw rdh = %d, hw rdt = %d\n",
		    E1000_READ_REG(&sc->hw, E1000_RDH(rxr->me)),
		    E1000_READ_REG(&sc->hw, E1000_RDT(rxr->me)));
	}
}

/*
 * 82574 only:
 * Write a new value to the EEPROM increasing the number of MSI-X
 * vectors from 3 to 5, for proper multiqueue support.
 */
static void
em_enable_vectors_82574(if_ctx_t ctx)
{
	struct e1000_softc *sc = iflib_get_softc(ctx);
	struct e1000_hw *hw = &sc->hw;
	device_t dev = iflib_get_dev(ctx);
	u16 edata;

	e1000_read_nvm(hw, EM_NVM_PCIE_CTRL, 1, &edata);
	if (bootverbose)
		device_printf(dev, "EM_NVM_PCIE_CTRL = %#06x\n", edata);
	if (((edata & EM_NVM_MSIX_N_MASK) >> EM_NVM_MSIX_N_SHIFT) != 4) {
		device_printf(dev, "Writing to eeprom: increasing "
		    "reported MSI-X vectors from 3 to 5...\n");
		edata &= ~(EM_NVM_MSIX_N_MASK);
		edata |= 4 << EM_NVM_MSIX_N_SHIFT;
		e1000_write_nvm(hw, EM_NVM_PCIE_CTRL, 1, &edata);
		e1000_update_nvm_checksum(hw);
		device_printf(dev, "Writing to eeprom: done\n");
	}
}