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_DPL_GET_PKT_LIMIT_DEFAULT (64 * 1024) 79 #define SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT 1024 80 #define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 64 81 82 /* 83 * Deferred packet list. 84 */ 85 struct sfxge_tx_dpl { 86 unsigned int std_get_max; /* Maximum number of packets 87 * in get list */ 88 unsigned int std_get_non_tcp_max; /* Maximum number 89 * of non-TCP packets 90 * in get list */ 91 unsigned int std_put_max; /* Maximum number of packets 92 * in put list */ 93 uintptr_t std_put; /* Head of put list. */ 94 struct mbuf *std_get; /* Head of get list. */ 95 struct mbuf **std_getp; /* Tail of get list. */ 96 unsigned int std_get_count; /* Packets in get list. */ 97 unsigned int std_get_non_tcp_count; /* Non-TCP packets 98 * in get list */ 99 unsigned int std_get_hiwat; /* Packets in get list 100 * high watermark */ 101 }; 102 103 104 #define SFXGE_TX_BUFFER_SIZE 0x400 105 #define SFXGE_TX_HEADER_SIZE 0x100 106 #define SFXGE_TX_COPY_THRESHOLD 0x200 107 108 enum sfxge_txq_state { 109 SFXGE_TXQ_UNINITIALIZED = 0, 110 SFXGE_TXQ_INITIALIZED, 111 SFXGE_TXQ_STARTED 112 }; 113 114 enum sfxge_txq_type { 115 SFXGE_TXQ_NON_CKSUM = 0, 116 SFXGE_TXQ_IP_CKSUM, 117 SFXGE_TXQ_IP_TCP_UDP_CKSUM, 118 SFXGE_TXQ_NTYPES 119 }; 120 121 #define SFXGE_TXQ_UNBLOCK_LEVEL(_entries) (EFX_TXQ_LIMIT(_entries) / 4) 122 123 #define SFXGE_TX_BATCH 64 124 125 #ifdef SFXGE_HAVE_MQ 126 #define SFXGE_TX_LOCK(txq) (&(txq)->lock) 127 #define SFXGE_TX_SCALE(sc) ((sc)->intr.n_alloc) 128 #else 129 #define SFXGE_TX_LOCK(txq) (&(txq)->sc->tx_lock) 130 #define SFXGE_TX_SCALE(sc) 1 131 #endif 132 133 #define SFXGE_TXQ_LOCK_INIT(_txq, _ifname, _txq_index) \ 134 do { \ 135 struct sfxge_txq *__txq = (_txq); \ 136 \ 137 snprintf((__txq)->lock_name, \ 138 sizeof((__txq)->lock_name), \ 139 "%s:txq%u", (_ifname), (_txq_index)); \ 140 mtx_init(&(__txq)->lock, (__txq)->lock_name, \ 141 NULL, MTX_DEF); \ 142 } while (B_FALSE) 143 #define SFXGE_TXQ_LOCK_DESTROY(_txq) \ 144 mtx_destroy(&(_txq)->lock) 145 #define SFXGE_TXQ_LOCK(_txq) \ 146 mtx_lock(SFXGE_TX_LOCK(_txq)) 147 #define SFXGE_TXQ_TRYLOCK(_txq) \ 148 mtx_trylock(SFXGE_TX_LOCK(_txq)) 149 #define SFXGE_TXQ_UNLOCK(_txq) \ 150 mtx_unlock(SFXGE_TX_LOCK(_txq)) 151 #define SFXGE_TXQ_LOCK_ASSERT_OWNED(_txq) \ 152 mtx_assert(SFXGE_TX_LOCK(_txq), MA_OWNED) 153 154 155 struct sfxge_txq { 156 /* The following fields should be written very rarely */ 157 struct sfxge_softc *sc; 158 enum sfxge_txq_state init_state; 159 enum sfxge_flush_state flush_state; 160 enum sfxge_txq_type type; 161 unsigned int txq_index; 162 unsigned int evq_index; 163 efsys_mem_t mem; 164 unsigned int buf_base_id; 165 unsigned int entries; 166 unsigned int ptr_mask; 167 168 struct sfxge_tx_mapping *stmp; /* Packets in flight. */ 169 bus_dma_tag_t packet_dma_tag; 170 efx_buffer_t *pend_desc; 171 efx_txq_t *common; 172 173 efsys_mem_t *tsoh_buffer; 174 175 char lock_name[SFXGE_LOCK_NAME_MAX]; 176 177 /* This field changes more often and is read regularly on both 178 * the initiation and completion paths 179 */ 180 int blocked __aligned(CACHE_LINE_SIZE); 181 182 /* The following fields change more often, and are used mostly 183 * on the initiation path 184 */ 185 #ifdef SFXGE_HAVE_MQ 186 struct mtx lock __aligned(CACHE_LINE_SIZE); 187 struct sfxge_tx_dpl dpl; /* Deferred packet list. */ 188 unsigned int n_pend_desc; 189 #else 190 unsigned int n_pend_desc __aligned(CACHE_LINE_SIZE); 191 #endif 192 unsigned int added; 193 unsigned int reaped; 194 /* Statistics */ 195 unsigned long tso_bursts; 196 unsigned long tso_packets; 197 unsigned long tso_long_headers; 198 unsigned long collapses; 199 unsigned long drops; 200 unsigned long get_overflow; 201 unsigned long get_non_tcp_overflow; 202 unsigned long put_overflow; 203 unsigned long netdown_drops; 204 unsigned long tso_pdrop_too_many; 205 unsigned long tso_pdrop_no_rsrc; 206 207 /* The following fields change more often, and are used mostly 208 * on the completion path 209 */ 210 unsigned int pending __aligned(CACHE_LINE_SIZE); 211 unsigned int completed; 212 struct sfxge_txq *next; 213 }; 214 215 struct sfxge_evq; 216 217 extern int sfxge_tx_packet_add(struct sfxge_txq *, struct mbuf *); 218 219 extern int sfxge_tx_init(struct sfxge_softc *sc); 220 extern void sfxge_tx_fini(struct sfxge_softc *sc); 221 extern int sfxge_tx_start(struct sfxge_softc *sc); 222 extern void sfxge_tx_stop(struct sfxge_softc *sc); 223 extern void sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq); 224 extern void sfxge_tx_qflush_done(struct sfxge_txq *txq); 225 #ifdef SFXGE_HAVE_MQ 226 extern void sfxge_if_qflush(struct ifnet *ifp); 227 extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m); 228 #else 229 extern void sfxge_if_start(struct ifnet *ifp); 230 #endif 231 232 #endif 233