/* * This file is provided under a CDDLv1 license. When using or * redistributing this file, you may do so under this license. * In redistributing this file this license must be included * and no other modification of this header file is permitted. * * CDDL LICENSE SUMMARY * * Copyright(c) 1999 - 2009 Intel Corporation. All rights reserved. * * The contents of this file are subject to the terms of Version * 1.0 of the Common Development and Distribution License (the "License"). * * You should have received a copy of the License with this software. * You can obtain a copy of the License at * http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. */ /* * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. */ /* * Copyright 2011 Nexenta Systems, Inc. All rights reserved. */ /* * ********************************************************************** * * * Module Name: * * e1000g_rx.c * * * * Abstract: * * This file contains some routines that take care of Receive * * interrupt and also for the received packets it sends up to * * upper layer. * * It tries to do a zero copy if free buffers are available in * * the pool. * * * * ********************************************************************** */ #include "e1000g_sw.h" #include "e1000g_debug.h" static p_rx_sw_packet_t e1000g_get_buf(e1000g_rx_data_t *rx_data); #pragma inline(e1000g_get_buf) /* * e1000g_rxfree_func - the call-back function to reclaim rx buffer * * This function is called when an mp is freed by the user thru * freeb call (Only for mp constructed through desballoc call) * It returns back the freed buffer to the freelist */ void e1000g_rxfree_func(p_rx_sw_packet_t packet) { e1000g_rx_data_t *rx_data; private_devi_list_t *devi_node; struct e1000g *Adapter; uint32_t ring_cnt; uint32_t ref_cnt; unsigned char *address; if (packet->ref_cnt == 0) { /* * This case only happens when rx buffers are being freed * in e1000g_stop() and freemsg() is called. */ return; } rx_data = (e1000g_rx_data_t *)(uintptr_t)packet->rx_data; if (packet->mp == NULL) { /* * Allocate a mblk that binds to the data buffer */ address = (unsigned char *)packet->rx_buf->address; if (address != NULL) { packet->mp = desballoc((unsigned char *) address, packet->rx_buf->size, BPRI_MED, &packet->free_rtn); } } /* * Enqueue the recycled packets in a recycle queue. When freelist * dries up, move the entire chain of packets from recycle queue * to freelist. This helps in avoiding per packet mutex contention * around freelist. */ mutex_enter(&rx_data->recycle_lock); QUEUE_PUSH_TAIL(&rx_data->recycle_list, &packet->Link); rx_data->recycle_freepkt++; mutex_exit(&rx_data->recycle_lock); ref_cnt = atomic_dec_32_nv(&packet->ref_cnt); if (ref_cnt == 0) { mutex_enter(&e1000g_rx_detach_lock); e1000g_free_rx_sw_packet(packet, B_FALSE); atomic_dec_32(&rx_data->pending_count); atomic_dec_32(&e1000g_mblks_pending); if ((rx_data->pending_count == 0) && (rx_data->flag & E1000G_RX_STOPPED)) { devi_node = rx_data->priv_devi_node; if (devi_node != NULL) { ring_cnt = atomic_dec_32_nv( &devi_node->pending_rx_count); if ((ring_cnt == 0) && (devi_node->flag & E1000G_PRIV_DEVI_DETACH)) { e1000g_free_priv_devi_node( devi_node); } } else { Adapter = rx_data->rx_ring->adapter; atomic_dec_32( &Adapter->pending_rx_count); } e1000g_free_rx_pending_buffers(rx_data); e1000g_free_rx_data(rx_data); } mutex_exit(&e1000g_rx_detach_lock); } } /* * e1000g_rx_setup - setup rx data structures * * This routine initializes all of the receive related * structures. This includes the receive descriptors, the * actual receive buffers, and the rx_sw_packet software * structures. */ void e1000g_rx_setup(struct e1000g *Adapter) { struct e1000_hw *hw; p_rx_sw_packet_t packet; struct e1000_rx_desc *descriptor; uint32_t buf_low; uint32_t buf_high; uint32_t reg_val; uint32_t rctl; uint32_t rxdctl; uint32_t ert; uint16_t phy_data; int i; int size; e1000g_rx_data_t *rx_data; hw = &Adapter->shared; rx_data = Adapter->rx_ring->rx_data; /* * zero out all of the receive buffer descriptor memory * assures any previous data or status is erased */ bzero(rx_data->rbd_area, sizeof (struct e1000_rx_desc) * Adapter->rx_desc_num); if (!Adapter->rx_buffer_setup) { /* Init the list of "Receive Buffer" */ QUEUE_INIT_LIST(&rx_data->recv_list); /* Init the list of "Free Receive Buffer" */ QUEUE_INIT_LIST(&rx_data->free_list); /* Init the list of "Free Receive Buffer" */ QUEUE_INIT_LIST(&rx_data->recycle_list); /* * Setup Receive list and the Free list. Note that * the both were allocated in one packet area. */ packet = rx_data->packet_area; descriptor = rx_data->rbd_first; for (i = 0; i < Adapter->rx_desc_num; i++, packet = packet->next, descriptor++) { ASSERT(packet != NULL); ASSERT(descriptor != NULL); descriptor->buffer_addr = packet->rx_buf->dma_address; /* Add this rx_sw_packet to the receive list */ QUEUE_PUSH_TAIL(&rx_data->recv_list, &packet->Link); } for (i = 0; i < Adapter->rx_freelist_num; i++, packet = packet->next) { ASSERT(packet != NULL); /* Add this rx_sw_packet to the free list */ QUEUE_PUSH_TAIL(&rx_data->free_list, &packet->Link); } rx_data->avail_freepkt = Adapter->rx_freelist_num; rx_data->recycle_freepkt = 0; Adapter->rx_buffer_setup = B_TRUE; } else { /* Setup the initial pointer to the first rx descriptor */ packet = (p_rx_sw_packet_t) QUEUE_GET_HEAD(&rx_data->recv_list); descriptor = rx_data->rbd_first; for (i = 0; i < Adapter->rx_desc_num; i++) { ASSERT(packet != NULL); ASSERT(descriptor != NULL); descriptor->buffer_addr = packet->rx_buf->dma_address; /* Get next rx_sw_packet */ packet = (p_rx_sw_packet_t) QUEUE_GET_NEXT(&rx_data->recv_list, &packet->Link); descriptor++; } } E1000_WRITE_REG(&Adapter->shared, E1000_RDTR, Adapter->rx_intr_delay); E1000G_DEBUGLOG_1(Adapter, E1000G_INFO_LEVEL, "E1000_RDTR: 0x%x\n", Adapter->rx_intr_delay); if (hw->mac.type >= e1000_82540) { E1000_WRITE_REG(&Adapter->shared, E1000_RADV, Adapter->rx_intr_abs_delay); E1000G_DEBUGLOG_1(Adapter, E1000G_INFO_LEVEL, "E1000_RADV: 0x%x\n", Adapter->rx_intr_abs_delay); } /* * Setup our descriptor pointers */ rx_data->rbd_next = rx_data->rbd_first; size = Adapter->rx_desc_num * sizeof (struct e1000_rx_desc); E1000_WRITE_REG(hw, E1000_RDLEN(0), size); size = E1000_READ_REG(hw, E1000_RDLEN(0)); /* To get lower order bits */ buf_low = (uint32_t)rx_data->rbd_dma_addr; /* To get the higher order bits */ buf_high = (uint32_t)(rx_data->rbd_dma_addr >> 32); E1000_WRITE_REG(hw, E1000_RDBAH(0), buf_high); E1000_WRITE_REG(hw, E1000_RDBAL(0), buf_low); /* * Setup our HW Rx Head & Tail descriptor pointers */ E1000_WRITE_REG(hw, E1000_RDT(0), (uint32_t)(rx_data->rbd_last - rx_data->rbd_first)); E1000_WRITE_REG(hw, E1000_RDH(0), 0); /* * Setup the Receive Control Register (RCTL), and ENABLE the * receiver. The initial configuration is to: Enable the receiver, * accept broadcasts, discard bad packets (and long packets), * disable VLAN filter checking, set the receive descriptor * minimum threshold size to 1/2, and the receive buffer size to * 2k. */ rctl = E1000_RCTL_EN | /* Enable Receive Unit */ E1000_RCTL_BAM | /* Accept Broadcast Packets */ (hw->mac.mc_filter_type << E1000_RCTL_MO_SHIFT) | E1000_RCTL_RDMTS_HALF | E1000_RCTL_LBM_NO; /* Loopback Mode = none */ if (Adapter->default_mtu > ETHERMTU) rctl |= E1000_RCTL_LPE; /* Large Packet Enable bit */ if (Adapter->strip_crc) rctl |= E1000_RCTL_SECRC; /* Strip Ethernet CRC */ if (Adapter->mem_workaround_82546 && ((hw->mac.type == e1000_82545) || (hw->mac.type == e1000_82546) || (hw->mac.type == e1000_82546_rev_3))) { rctl |= E1000_RCTL_SZ_2048; } else { if ((Adapter->max_frame_size > FRAME_SIZE_UPTO_2K) && (Adapter->max_frame_size <= FRAME_SIZE_UPTO_4K)) rctl |= E1000_RCTL_SZ_4096 | E1000_RCTL_BSEX; else if ((Adapter->max_frame_size > FRAME_SIZE_UPTO_4K) && (Adapter->max_frame_size <= FRAME_SIZE_UPTO_8K)) rctl |= E1000_RCTL_SZ_8192 | E1000_RCTL_BSEX; else if ((Adapter->max_frame_size > FRAME_SIZE_UPTO_8K) && (Adapter->max_frame_size <= FRAME_SIZE_UPTO_16K)) rctl |= E1000_RCTL_SZ_16384 | E1000_RCTL_BSEX; else rctl |= E1000_RCTL_SZ_2048; } if (e1000_tbi_sbp_enabled_82543(hw)) rctl |= E1000_RCTL_SBP; /* * Enable Early Receive Threshold (ERT) on supported devices. * Only takes effect when packet size is equal or larger than the * specified value (in 8 byte units), e.g. using jumbo frames. */ if ((hw->mac.type == e1000_82573) || (hw->mac.type == e1000_82574) || (hw->mac.type == e1000_ich9lan) || (hw->mac.type == e1000_ich10lan)) { ert = E1000_ERT_2048; /* * Special modification when ERT and * jumbo frames are enabled */ if (Adapter->default_mtu > ETHERMTU) { rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(0)); E1000_WRITE_REG(hw, E1000_RXDCTL(0), rxdctl | 0x3); ert |= (1 << 13); } E1000_WRITE_REG(hw, E1000_ERT, ert); } /* Workaround errata on 82577/8 adapters with large frames */ if ((hw->mac.type == e1000_pchlan) && (Adapter->default_mtu > ETHERMTU)) { (void) e1000_read_phy_reg(hw, PHY_REG(770, 26), &phy_data); phy_data &= 0xfff8; phy_data |= (1 << 2); (void) e1000_write_phy_reg(hw, PHY_REG(770, 26), phy_data); if (hw->phy.type == e1000_phy_82577) { (void) e1000_read_phy_reg(hw, 22, &phy_data); phy_data &= 0x0fff; phy_data |= (1 << 14); (void) e1000_write_phy_reg(hw, 0x10, 0x2823); (void) e1000_write_phy_reg(hw, 0x11, 0x0003); (void) e1000_write_phy_reg(hw, 22, phy_data); } } /* Workaround errata on 82579 adapters with large frames */ if (hw->mac.type == e1000_pch2lan) { boolean_t enable_jumbo = (Adapter->default_mtu > ETHERMTU ? B_TRUE : B_FALSE); if (e1000_lv_jumbo_workaround_ich8lan(hw, enable_jumbo) != 0) E1000G_DEBUGLOG_0(Adapter, E1000G_INFO_LEVEL, "failed to enable jumbo frame workaround mode\n"); } reg_val = E1000_RXCSUM_TUOFL | /* TCP/UDP checksum offload Enable */ E1000_RXCSUM_IPOFL; /* IP checksum offload Enable */ E1000_WRITE_REG(hw, E1000_RXCSUM, reg_val); /* * Workaround: Set bit 16 (IPv6_ExDIS) to disable the * processing of received IPV6 extension headers */ if ((hw->mac.type == e1000_82571) || (hw->mac.type == e1000_82572)) { reg_val = E1000_READ_REG(hw, E1000_RFCTL); reg_val |= (E1000_RFCTL_IPV6_EX_DIS | E1000_RFCTL_NEW_IPV6_EXT_DIS); E1000_WRITE_REG(hw, E1000_RFCTL, reg_val); } /* Write to enable the receive unit */ E1000_WRITE_REG(hw, E1000_RCTL, rctl); } /* * e1000g_get_buf - get an rx sw packet from the free_list */ static p_rx_sw_packet_t e1000g_get_buf(e1000g_rx_data_t *rx_data) { p_rx_sw_packet_t packet; struct e1000g *Adapter; Adapter = rx_data->rx_ring->adapter; mutex_enter(&rx_data->freelist_lock); packet = (p_rx_sw_packet_t) QUEUE_POP_HEAD(&rx_data->free_list); if (packet != NULL) { rx_data->avail_freepkt--; goto end; } /* * If the freelist has no packets, check the recycle list * to see if there are any available descriptor there. */ mutex_enter(&rx_data->recycle_lock); QUEUE_SWITCH(&rx_data->free_list, &rx_data->recycle_list); rx_data->avail_freepkt = rx_data->recycle_freepkt; rx_data->recycle_freepkt = 0; mutex_exit(&rx_data->recycle_lock); packet = (p_rx_sw_packet_t)QUEUE_POP_HEAD(&rx_data->free_list); if (packet != NULL) { rx_data->avail_freepkt--; goto end; } if (Adapter->rx_freelist_num < Adapter->rx_freelist_limit) { (void) e1000g_increase_rx_packets(rx_data); packet = (p_rx_sw_packet_t) QUEUE_POP_HEAD(&rx_data->free_list); if (packet != NULL) { rx_data->avail_freepkt--; } } end: mutex_exit(&rx_data->freelist_lock); return (packet); } /* * e1000g_receive - main receive routine * * This routine will process packets received in an interrupt */ mblk_t * e1000g_receive(e1000g_rx_ring_t *rx_ring, mblk_t **tail, uint_t sz) { struct e1000_hw *hw; mblk_t *nmp; mblk_t *ret_mp; mblk_t *ret_nmp; struct e1000_rx_desc *current_desc; struct e1000_rx_desc *last_desc; p_rx_sw_packet_t packet; p_rx_sw_packet_t newpkt; uint16_t length; uint32_t pkt_count; uint32_t desc_count; boolean_t accept_frame; boolean_t end_of_packet; boolean_t need_copy; struct e1000g *Adapter; dma_buffer_t *rx_buf; uint16_t cksumflags; uint_t chain_sz = 0; e1000g_rx_data_t *rx_data; uint32_t max_size; uint32_t min_size; ret_mp = NULL; ret_nmp = NULL; pkt_count = 0; desc_count = 0; cksumflags = 0; Adapter = rx_ring->adapter; rx_data = rx_ring->rx_data; hw = &Adapter->shared; /* Sync the Rx descriptor DMA buffers */ (void) ddi_dma_sync(rx_data->rbd_dma_handle, 0, 0, DDI_DMA_SYNC_FORKERNEL); if (e1000g_check_dma_handle(rx_data->rbd_dma_handle) != DDI_FM_OK) { ddi_fm_service_impact(Adapter->dip, DDI_SERVICE_DEGRADED); Adapter->e1000g_state |= E1000G_ERROR; return (NULL); } current_desc = rx_data->rbd_next; if (!(current_desc->status & E1000_RXD_STAT_DD)) { /* * don't send anything up. just clear the RFD */ E1000G_DEBUG_STAT(rx_ring->stat_none); return (NULL); } max_size = Adapter->max_frame_size - ETHERFCSL - VLAN_TAGSZ; min_size = ETHERMIN; /* * Loop through the receive descriptors starting at the last known * descriptor owned by the hardware that begins a packet. */ while ((current_desc->status & E1000_RXD_STAT_DD) && (pkt_count < Adapter->rx_limit_onintr) && ((sz == E1000G_CHAIN_NO_LIMIT) || (chain_sz <= sz))) { desc_count++; /* * Now this can happen in Jumbo frame situation. */ if (current_desc->status & E1000_RXD_STAT_EOP) { /* packet has EOP set */ end_of_packet = B_TRUE; } else { /* * If this received buffer does not have the * End-Of-Packet bit set, the received packet * will consume multiple buffers. We won't send this * packet upstack till we get all the related buffers. */ end_of_packet = B_FALSE; } /* * Get a pointer to the actual receive buffer * The mp->b_rptr is mapped to The CurrentDescriptor * Buffer Address. */ packet = (p_rx_sw_packet_t)QUEUE_POP_HEAD(&rx_data->recv_list); ASSERT(packet != NULL); rx_buf = packet->rx_buf; length = current_desc->length; #ifdef __sparc if (packet->dma_type == USE_DVMA) dvma_sync(rx_buf->dma_handle, 0, DDI_DMA_SYNC_FORKERNEL); else (void) ddi_dma_sync(rx_buf->dma_handle, E1000G_IPALIGNROOM, length, DDI_DMA_SYNC_FORKERNEL); #else (void) ddi_dma_sync(rx_buf->dma_handle, E1000G_IPALIGNROOM, length, DDI_DMA_SYNC_FORKERNEL); #endif if (e1000g_check_dma_handle( rx_buf->dma_handle) != DDI_FM_OK) { ddi_fm_service_impact(Adapter->dip, DDI_SERVICE_DEGRADED); Adapter->e1000g_state |= E1000G_ERROR; goto rx_drop; } accept_frame = (current_desc->errors == 0) || ((current_desc->errors & (E1000_RXD_ERR_TCPE | E1000_RXD_ERR_IPE)) != 0); if (hw->mac.type == e1000_82543) { unsigned char last_byte; last_byte = *((unsigned char *)rx_buf->address + length - 1); if (TBI_ACCEPT(hw, current_desc->status, current_desc->errors, current_desc->length, last_byte, Adapter->min_frame_size, Adapter->max_frame_size)) { e1000_tbi_adjust_stats(Adapter, length, hw->mac.addr); length--; accept_frame = B_TRUE; } else if (e1000_tbi_sbp_enabled_82543(hw) && (current_desc->errors == E1000_RXD_ERR_CE)) { accept_frame = B_TRUE; } } /* * Indicate the packet to the NOS if it was good. * Normally, hardware will discard bad packets for us. * Check for the packet to be a valid Ethernet packet */ if (!accept_frame) { /* * error in incoming packet, either the packet is not a * ethernet size packet, or the packet has an error. In * either case, the packet will simply be discarded. */ E1000G_DEBUGLOG_0(Adapter, E1000G_INFO_LEVEL, "Process Receive Interrupts: Error in Packet\n"); E1000G_STAT(rx_ring->stat_error); /* * Returning here as we are done here. There is * no point in waiting for while loop to elapse * and the things which were done. More efficient * and less error prone... */ goto rx_drop; } /* * If the Ethernet CRC is not stripped by the hardware, * we need to strip it before sending it up to the stack. */ if (end_of_packet && !Adapter->strip_crc) { if (length > ETHERFCSL) { length -= ETHERFCSL; } else { /* * If the fragment is smaller than the CRC, * drop this fragment, do the processing of * the end of the packet. */ if (rx_data->rx_mblk_tail == NULL) { E1000G_STAT(rx_ring->stat_crc_only_pkt); goto rx_next_desc; } rx_data->rx_mblk_tail->b_wptr -= ETHERFCSL - length; rx_data->rx_mblk_len -= ETHERFCSL - length; goto rx_end_of_packet; } } need_copy = B_TRUE; if (length <= Adapter->rx_bcopy_thresh) goto rx_copy; /* * Get the pre-constructed mblk that was associated * to the receive data buffer. */ if (packet->mp == NULL) { packet->mp = desballoc((unsigned char *) rx_buf->address, length, BPRI_MED, &packet->free_rtn); } if (packet->mp != NULL) { /* * We have two sets of buffer pool. One associated with * the Rxdescriptors and other a freelist buffer pool. * Each time we get a good packet, Try to get a buffer * from the freelist pool using e1000g_get_buf. If we * get free buffer, then replace the descriptor buffer * address with the free buffer we just got, and pass * the pre-constructed mblk upstack. (note no copying) * * If we failed to get a free buffer, then try to * allocate a new buffer(mp) and copy the recv buffer * content to our newly allocated buffer(mp). Don't * disturb the desriptor buffer address. (note copying) */ newpkt = e1000g_get_buf(rx_data); if (newpkt != NULL) { /* * Get the mblk associated to the data, * and strip it off the sw packet. */ nmp = packet->mp; packet->mp = NULL; atomic_inc_32(&packet->ref_cnt); /* * Now replace old buffer with the new * one we got from free list * Both the RxSwPacket as well as the * Receive Buffer Descriptor will now * point to this new packet. */ packet = newpkt; current_desc->buffer_addr = newpkt->rx_buf->dma_address; need_copy = B_FALSE; } else { /* EMPTY */ E1000G_DEBUG_STAT(rx_ring->stat_no_freepkt); } } rx_copy: if (need_copy) { /* * No buffers available on free list, * bcopy the data from the buffer and * keep the original buffer. Dont want to * do this.. Yack but no other way */ if ((nmp = allocb(length + E1000G_IPALIGNROOM, BPRI_MED)) == NULL) { /* * The system has no buffers available * to send up the incoming packet, hence * the packet will have to be processed * when there're more buffers available. */ E1000G_STAT(rx_ring->stat_allocb_fail); goto rx_drop; } nmp->b_rptr += E1000G_IPALIGNROOM; nmp->b_wptr += E1000G_IPALIGNROOM; /* * The free list did not have any buffers * available, so, the received packet will * have to be copied into a mp and the original * buffer will have to be retained for future * packet reception. */ bcopy(rx_buf->address, nmp->b_wptr, length); } ASSERT(nmp != NULL); nmp->b_wptr += length; if (rx_data->rx_mblk == NULL) { /* * TCP/UDP checksum offload and * IP checksum offload */ if (!(current_desc->status & E1000_RXD_STAT_IXSM)) { /* * Check TCP/UDP checksum */ if ((current_desc->status & E1000_RXD_STAT_TCPCS) && !(current_desc->errors & E1000_RXD_ERR_TCPE)) cksumflags |= HCK_FULLCKSUM_OK; /* * Check IP Checksum */ if ((current_desc->status & E1000_RXD_STAT_IPCS) && !(current_desc->errors & E1000_RXD_ERR_IPE)) cksumflags |= HCK_IPV4_HDRCKSUM_OK; } } /* * We need to maintain our packet chain in the global * Adapter structure, for the Rx processing can end * with a fragment that has no EOP set. */ if (rx_data->rx_mblk == NULL) { /* Get the head of the message chain */ rx_data->rx_mblk = nmp; rx_data->rx_mblk_tail = nmp; rx_data->rx_mblk_len = length; } else { /* Not the first packet */ /* Continue adding buffers */ rx_data->rx_mblk_tail->b_cont = nmp; rx_data->rx_mblk_tail = nmp; rx_data->rx_mblk_len += length; } ASSERT(rx_data->rx_mblk != NULL); ASSERT(rx_data->rx_mblk_tail != NULL); ASSERT(rx_data->rx_mblk_tail->b_cont == NULL); /* * Now this MP is ready to travel upwards but some more * fragments are coming. * We will send packet upwards as soon as we get EOP * set on the packet. */ if (!end_of_packet) { /* * continue to get the next descriptor, * Tail would be advanced at the end */ goto rx_next_desc; } rx_end_of_packet: if (E1000G_IS_VLAN_PACKET(rx_data->rx_mblk->b_rptr)) max_size = Adapter->max_frame_size - ETHERFCSL; if ((rx_data->rx_mblk_len > max_size) || (rx_data->rx_mblk_len < min_size)) { E1000G_STAT(rx_ring->stat_size_error); goto rx_drop; } /* * Found packet with EOP * Process the last fragment. */ if (cksumflags != 0) { mac_hcksum_set(rx_data->rx_mblk, 0, 0, 0, 0, cksumflags); cksumflags = 0; } /* * Count packets that span multi-descriptors */ E1000G_DEBUG_STAT_COND(rx_ring->stat_multi_desc, (rx_data->rx_mblk->b_cont != NULL)); /* * Append to list to send upstream */ if (ret_mp == NULL) { ret_mp = ret_nmp = rx_data->rx_mblk; } else { ret_nmp->b_next = rx_data->rx_mblk; ret_nmp = rx_data->rx_mblk; } ret_nmp->b_next = NULL; *tail = ret_nmp; chain_sz += length; rx_data->rx_mblk = NULL; rx_data->rx_mblk_tail = NULL; rx_data->rx_mblk_len = 0; pkt_count++; rx_next_desc: /* * Zero out the receive descriptors status */ current_desc->status = 0; if (current_desc == rx_data->rbd_last) rx_data->rbd_next = rx_data->rbd_first; else rx_data->rbd_next++; last_desc = current_desc; current_desc = rx_data->rbd_next; /* * Put the buffer that we just indicated back * at the end of our list */ QUEUE_PUSH_TAIL(&rx_data->recv_list, &packet->Link); } /* while loop */ /* Sync the Rx descriptor DMA buffers */ (void) ddi_dma_sync(rx_data->rbd_dma_handle, 0, 0, DDI_DMA_SYNC_FORDEV); /* * Advance the E1000's Receive Queue #0 "Tail Pointer". */ E1000_WRITE_REG(hw, E1000_RDT(0), (uint32_t)(last_desc - rx_data->rbd_first)); if (e1000g_check_acc_handle(Adapter->osdep.reg_handle) != DDI_FM_OK) { ddi_fm_service_impact(Adapter->dip, DDI_SERVICE_DEGRADED); Adapter->e1000g_state |= E1000G_ERROR; } Adapter->rx_pkt_cnt = pkt_count; return (ret_mp); rx_drop: /* * Zero out the receive descriptors status */ current_desc->status = 0; /* Sync the Rx descriptor DMA buffers */ (void) ddi_dma_sync(rx_data->rbd_dma_handle, 0, 0, DDI_DMA_SYNC_FORDEV); if (current_desc == rx_data->rbd_last) rx_data->rbd_next = rx_data->rbd_first; else rx_data->rbd_next++; last_desc = current_desc; QUEUE_PUSH_TAIL(&rx_data->recv_list, &packet->Link); /* * Reclaim all old buffers already allocated during * Jumbo receives.....for incomplete reception */ if (rx_data->rx_mblk != NULL) { freemsg(rx_data->rx_mblk); rx_data->rx_mblk = NULL; rx_data->rx_mblk_tail = NULL; rx_data->rx_mblk_len = 0; } /* * Advance the E1000's Receive Queue #0 "Tail Pointer". */ E1000_WRITE_REG(hw, E1000_RDT(0), (uint32_t)(last_desc - rx_data->rbd_first)); if (e1000g_check_acc_handle(Adapter->osdep.reg_handle) != DDI_FM_OK) { ddi_fm_service_impact(Adapter->dip, DDI_SERVICE_DEGRADED); Adapter->e1000g_state |= E1000G_ERROR; } return (ret_mp); }