sfxge_tx.h revision 291488
1/*- 2 * Copyright (c) 2010-2015 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 are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 27 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * The views and conclusions contained in the software and documentation are 30 * those of the authors and should not be interpreted as representing official 31 * policies, either expressed or implied, of the FreeBSD Project. 32 * 33 * $FreeBSD: head/sys/dev/sfxge/sfxge_tx.h 291488 2015-11-30 13:27:40Z arybchik $ 34 */ 35 36#ifndef _SFXGE_TX_H 37#define _SFXGE_TX_H 38 39#include <netinet/in.h> 40#include <netinet/ip.h> 41#include <netinet/tcp.h> 42 43/* Maximum size of TSO packet */ 44#define SFXGE_TSO_MAX_SIZE (65535) 45 46/* 47 * Maximum number of segments to be created for a TSO packet. 48 * Allow for a reasonable minimum MSS of 512. 49 */ 50#define SFXGE_TSO_MAX_SEGS howmany(SFXGE_TSO_MAX_SIZE, 512) 51 52/* Maximum number of DMA segments needed to map an mbuf chain. With 53 * TSO, the mbuf length may be just over 64K, divided into 2K mbuf 54 * clusters taking into account that the first may be not 2K cluster 55 * boundary aligned. 56 * The chain could be longer than this initially, but can be shortened 57 * with m_collapse(). 58 */ 59#define SFXGE_TX_MAPPING_MAX_SEG \ 60 (1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1) 61 62/* 63 * Buffer mapping flags. 64 * 65 * Buffers and DMA mappings must be freed when the last descriptor 66 * referring to them is completed. Set the TX_BUF_UNMAP and 67 * TX_BUF_MBUF flags on the last descriptor generated for an mbuf 68 * chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to 69 * a heap buffer. 70 */ 71enum sfxge_tx_buf_flags { 72 TX_BUF_UNMAP = 1, 73 TX_BUF_MBUF = 2, 74}; 75 76/* 77 * Buffer mapping information for descriptors in flight. 78 */ 79struct sfxge_tx_mapping { 80 union { 81 struct mbuf *mbuf; 82 caddr_t heap_buf; 83 } u; 84 bus_dmamap_t map; 85 enum sfxge_tx_buf_flags flags; 86}; 87 88#define SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT (64 * 1024) 89#define SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT 1024 90#define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 1024 91 92/* 93 * Deferred packet list. 94 */ 95struct sfxge_tx_dpl { 96 unsigned int std_get_max; /* Maximum number of packets 97 * in get list */ 98 unsigned int std_get_non_tcp_max; /* Maximum number 99 * of non-TCP packets 100 * in get list */ 101 unsigned int std_put_max; /* Maximum number of packets 102 * in put list */ 103 uintptr_t std_put; /* Head of put list. */ 104 struct mbuf *std_get; /* Head of get list. */ 105 struct mbuf **std_getp; /* Tail of get list. */ 106 unsigned int std_get_count; /* Packets in get list. */ 107 unsigned int std_get_non_tcp_count; /* Non-TCP packets 108 * in get list */ 109 unsigned int std_get_hiwat; /* Packets in get list 110 * high watermark */ 111 unsigned int std_put_hiwat; /* Packets in put list 112 * high watermark */ 113}; 114 115 116#define SFXGE_TX_BUFFER_SIZE 0x400 117#define SFXGE_TX_HEADER_SIZE 0x100 118#define SFXGE_TX_COPY_THRESHOLD 0x200 119 120enum sfxge_txq_state { 121 SFXGE_TXQ_UNINITIALIZED = 0, 122 SFXGE_TXQ_INITIALIZED, 123 SFXGE_TXQ_STARTED 124}; 125 126enum sfxge_txq_type { 127 SFXGE_TXQ_NON_CKSUM = 0, 128 SFXGE_TXQ_IP_CKSUM, 129 SFXGE_TXQ_IP_TCP_UDP_CKSUM, 130 SFXGE_TXQ_NTYPES 131}; 132 133#define SFXGE_TXQ_UNBLOCK_LEVEL(_entries) (EFX_TXQ_LIMIT(_entries) / 4) 134 135#define SFXGE_TX_BATCH 64 136 137#define SFXGE_TXQ_LOCK_INIT(_txq, _ifname, _txq_index) \ 138 do { \ 139 struct sfxge_txq *__txq = (_txq); \ 140 \ 141 snprintf((__txq)->lock_name, \ 142 sizeof((__txq)->lock_name), \ 143 "%s:txq%u", (_ifname), (_txq_index)); \ 144 mtx_init(&(__txq)->lock, (__txq)->lock_name, \ 145 NULL, MTX_DEF); \ 146 } while (B_FALSE) 147#define SFXGE_TXQ_LOCK_DESTROY(_txq) \ 148 mtx_destroy(&(_txq)->lock) 149#define SFXGE_TXQ_LOCK(_txq) \ 150 mtx_lock(&(_txq)->lock) 151#define SFXGE_TXQ_TRYLOCK(_txq) \ 152 mtx_trylock(&(_txq)->lock) 153#define SFXGE_TXQ_UNLOCK(_txq) \ 154 mtx_unlock(&(_txq)->lock) 155#define SFXGE_TXQ_LOCK_ASSERT_OWNED(_txq) \ 156 mtx_assert(&(_txq)->lock, MA_OWNED) 157#define SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(_txq) \ 158 mtx_assert(&(_txq)->lock, MA_NOTOWNED) 159 160 161struct sfxge_txq { 162 /* The following fields should be written very rarely */ 163 struct sfxge_softc *sc; 164 enum sfxge_txq_state init_state; 165 enum sfxge_flush_state flush_state; 166 enum sfxge_txq_type type; 167 unsigned int txq_index; 168 unsigned int evq_index; 169 efsys_mem_t mem; 170 unsigned int buf_base_id; 171 unsigned int entries; 172 unsigned int ptr_mask; 173 unsigned int max_pkt_desc; 174 175 struct sfxge_tx_mapping *stmp; /* Packets in flight. */ 176 bus_dma_tag_t packet_dma_tag; 177 efx_desc_t *pend_desc; 178 efx_txq_t *common; 179 180 efsys_mem_t *tsoh_buffer; 181 182 char lock_name[SFXGE_LOCK_NAME_MAX]; 183 184 /* This field changes more often and is read regularly on both 185 * the initiation and completion paths 186 */ 187 int blocked __aligned(CACHE_LINE_SIZE); 188 189 /* The following fields change more often, and are used mostly 190 * on the initiation path 191 */ 192 struct mtx lock __aligned(CACHE_LINE_SIZE); 193 struct sfxge_tx_dpl dpl; /* Deferred packet list. */ 194 unsigned int n_pend_desc; 195 unsigned int added; 196 unsigned int reaped; 197 198 /* The last VLAN TCI seen on the queue if FW-assisted tagging is 199 used */ 200 uint16_t hw_vlan_tci; 201 202 /* Statistics */ 203 unsigned long tso_bursts; 204 unsigned long tso_packets; 205 unsigned long tso_long_headers; 206 unsigned long collapses; 207 unsigned long drops; 208 unsigned long get_overflow; 209 unsigned long get_non_tcp_overflow; 210 unsigned long put_overflow; 211 unsigned long netdown_drops; 212 unsigned long tso_pdrop_too_many; 213 unsigned long tso_pdrop_no_rsrc; 214 215 /* The following fields change more often, and are used mostly 216 * on the completion path 217 */ 218 unsigned int pending __aligned(CACHE_LINE_SIZE); 219 unsigned int completed; 220 struct sfxge_txq *next; 221}; 222 223struct sfxge_evq; 224 225extern uint64_t sfxge_tx_get_drops(struct sfxge_softc *sc); 226 227extern int sfxge_tx_init(struct sfxge_softc *sc); 228extern void sfxge_tx_fini(struct sfxge_softc *sc); 229extern int sfxge_tx_start(struct sfxge_softc *sc); 230extern void sfxge_tx_stop(struct sfxge_softc *sc); 231extern void sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq); 232extern void sfxge_tx_qflush_done(struct sfxge_txq *txq); 233extern void sfxge_if_qflush(struct ifnet *ifp); 234extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m); 235 236#endif 237