1 /*- 2 * Copyright (c) 2010-2011 Solarflare Communications, Inc. 3 * All rights reserved. 4 * 5 * This software was developed in part by Philip Paeps under contract for 6 * Solarflare Communications, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #ifndef _SFXGE_TX_H 33 #define _SFXGE_TX_H 34 35 #include <netinet/in.h> 36 #include <netinet/ip.h> 37 #include <netinet/tcp.h> 38 39 /* Maximum number of DMA segments needed to map an mbuf chain. With 40 * TSO, the mbuf length may be just over 64K, divided into 2K mbuf 41 * clusters. (The chain could be longer than this initially, but can 42 * be shortened with m_collapse().) 43 */ 44 #define SFXGE_TX_MAPPING_MAX_SEG (64 / 2 + 1) 45 46 /* Maximum number of DMA segments needed to map an output packet. It 47 * could overlap all mbufs in the chain and also require an extra 48 * segment for a TSO header. 49 */ 50 #define SFXGE_TX_PACKET_MAX_SEG (SFXGE_TX_MAPPING_MAX_SEG + 1) 51 52 /* 53 * Buffer mapping flags. 54 * 55 * Buffers and DMA mappings must be freed when the last descriptor 56 * referring to them is completed. Set the TX_BUF_UNMAP and 57 * TX_BUF_MBUF flags on the last descriptor generated for an mbuf 58 * chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to 59 * a heap buffer. 60 */ 61 enum sfxge_tx_buf_flags { 62 TX_BUF_UNMAP = 1, 63 TX_BUF_MBUF = 2, 64 }; 65 66 /* 67 * Buffer mapping information for descriptors in flight. 68 */ 69 struct sfxge_tx_mapping { 70 union { 71 struct mbuf *mbuf; 72 caddr_t heap_buf; 73 } u; 74 bus_dmamap_t map; 75 enum sfxge_tx_buf_flags flags; 76 }; 77 78 #define SFXGE_TX_MAX_DEFERRED 64 79 80 /* 81 * Deferred packet list. 82 */ 83 struct sfxge_tx_dpl { 84 uintptr_t std_put; /* Head of put list. */ 85 struct mbuf *std_get; /* Head of get list. */ 86 struct mbuf **std_getp; /* Tail of get list. */ 87 unsigned int std_count; /* Count of packets. */ 88 }; 89 90 91 #define SFXGE_TX_BUFFER_SIZE 0x400 92 #define SFXGE_TX_HEADER_SIZE 0x100 93 #define SFXGE_TX_COPY_THRESHOLD 0x200 94 95 enum sfxge_txq_state { 96 SFXGE_TXQ_UNINITIALIZED = 0, 97 SFXGE_TXQ_INITIALIZED, 98 SFXGE_TXQ_STARTED 99 }; 100 101 enum sfxge_txq_type { 102 SFXGE_TXQ_NON_CKSUM = 0, 103 SFXGE_TXQ_IP_CKSUM, 104 SFXGE_TXQ_IP_TCP_UDP_CKSUM, 105 SFXGE_TXQ_NTYPES 106 }; 107 108 #define SFXGE_TXQ_UNBLOCK_LEVEL (EFX_TXQ_LIMIT(SFXGE_NDESCS) / 4) 109 110 #define SFXGE_TX_BATCH 64 111 112 #ifdef SFXGE_HAVE_MQ 113 #define SFXGE_TXQ_LOCK(txq) (&(txq)->lock) 114 #define SFXGE_TX_SCALE(sc) ((sc)->intr.n_alloc) 115 #else 116 #define SFXGE_TXQ_LOCK(txq) (&(txq)->sc->tx_lock) 117 #define SFXGE_TX_SCALE(sc) 1 118 #endif 119 120 struct sfxge_txq { 121 /* The following fields should be written very rarely */ 122 struct sfxge_softc *sc; 123 enum sfxge_txq_state init_state; 124 enum sfxge_flush_state flush_state; 125 enum sfxge_txq_type type; 126 unsigned int txq_index; 127 unsigned int evq_index; 128 efsys_mem_t mem; 129 unsigned int buf_base_id; 130 131 struct sfxge_tx_mapping *stmp; /* Packets in flight. */ 132 bus_dma_tag_t packet_dma_tag; 133 efx_buffer_t *pend_desc; 134 efx_txq_t *common; 135 struct sfxge_txq *next; 136 137 efsys_mem_t *tsoh_buffer; 138 139 /* This field changes more often and is read regularly on both 140 * the initiation and completion paths 141 */ 142 int blocked __aligned(CACHE_LINE_SIZE); 143 144 /* The following fields change more often, and are used mostly 145 * on the initiation path 146 */ 147 #ifdef SFXGE_HAVE_MQ 148 struct mtx lock __aligned(CACHE_LINE_SIZE); 149 struct sfxge_tx_dpl dpl; /* Deferred packet list. */ 150 unsigned int n_pend_desc; 151 #else 152 unsigned int n_pend_desc __aligned(CACHE_LINE_SIZE); 153 #endif 154 unsigned int added; 155 unsigned int reaped; 156 /* Statistics */ 157 unsigned long tso_bursts; 158 unsigned long tso_packets; 159 unsigned long tso_long_headers; 160 unsigned long collapses; 161 unsigned long drops; 162 163 /* The following fields change more often, and are used mostly 164 * on the completion path 165 */ 166 unsigned int pending __aligned(CACHE_LINE_SIZE); 167 unsigned int completed; 168 }; 169 170 extern int sfxge_tx_packet_add(struct sfxge_txq *, struct mbuf *); 171 172 extern int sfxge_tx_init(struct sfxge_softc *sc); 173 extern void sfxge_tx_fini(struct sfxge_softc *sc); 174 extern int sfxge_tx_start(struct sfxge_softc *sc); 175 extern void sfxge_tx_stop(struct sfxge_softc *sc); 176 extern void sfxge_tx_qcomplete(struct sfxge_txq *txq); 177 extern void sfxge_tx_qflush_done(struct sfxge_txq *txq); 178 #ifdef SFXGE_HAVE_MQ 179 extern void sfxge_if_qflush(struct ifnet *ifp); 180 extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m); 181 #else 182 extern void sfxge_if_start(struct ifnet *ifp); 183 #endif 184 185 #endif 186