sfxge_tx.h revision 284555
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: stable/10/sys/dev/sfxge/sfxge_tx.h 284555 2015-06-18 15:46:39Z 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. (The chain could be longer than this initially, but can 55 * be shortened with m_collapse().) 56 */ 57#define SFXGE_TX_MAPPING_MAX_SEG \ 58 (1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES)) 59 60/* 61 * Buffer mapping flags. 62 * 63 * Buffers and DMA mappings must be freed when the last descriptor 64 * referring to them is completed. Set the TX_BUF_UNMAP and 65 * TX_BUF_MBUF flags on the last descriptor generated for an mbuf 66 * chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to 67 * a heap buffer. 68 */ 69enum sfxge_tx_buf_flags { 70 TX_BUF_UNMAP = 1, 71 TX_BUF_MBUF = 2, 72}; 73 74/* 75 * Buffer mapping information for descriptors in flight. 76 */ 77struct sfxge_tx_mapping { 78 union { 79 struct mbuf *mbuf; 80 caddr_t heap_buf; 81 } u; 82 bus_dmamap_t map; 83 enum sfxge_tx_buf_flags flags; 84}; 85 86#define SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT (64 * 1024) 87#define SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT 1024 88#define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 1024 89 90/* 91 * Deferred packet list. 92 */ 93struct sfxge_tx_dpl { 94 unsigned int std_get_max; /* Maximum number of packets 95 * in get list */ 96 unsigned int std_get_non_tcp_max; /* Maximum number 97 * of non-TCP packets 98 * in get list */ 99 unsigned int std_put_max; /* Maximum number of packets 100 * in put list */ 101 uintptr_t std_put; /* Head of put list. */ 102 struct mbuf *std_get; /* Head of get list. */ 103 struct mbuf **std_getp; /* Tail of get list. */ 104 unsigned int std_get_count; /* Packets in get list. */ 105 unsigned int std_get_non_tcp_count; /* Non-TCP packets 106 * in get list */ 107 unsigned int std_get_hiwat; /* Packets in get list 108 * high watermark */ 109 unsigned int std_put_hiwat; /* Packets in put list 110 * high watermark */ 111}; 112 113 114#define SFXGE_TX_BUFFER_SIZE 0x400 115#define SFXGE_TX_HEADER_SIZE 0x100 116#define SFXGE_TX_COPY_THRESHOLD 0x200 117 118enum sfxge_txq_state { 119 SFXGE_TXQ_UNINITIALIZED = 0, 120 SFXGE_TXQ_INITIALIZED, 121 SFXGE_TXQ_STARTED 122}; 123 124enum sfxge_txq_type { 125 SFXGE_TXQ_NON_CKSUM = 0, 126 SFXGE_TXQ_IP_CKSUM, 127 SFXGE_TXQ_IP_TCP_UDP_CKSUM, 128 SFXGE_TXQ_NTYPES 129}; 130 131#define SFXGE_TXQ_UNBLOCK_LEVEL(_entries) (EFX_TXQ_LIMIT(_entries) / 4) 132 133#define SFXGE_TX_BATCH 64 134 135#define SFXGE_TXQ_LOCK_INIT(_txq, _ifname, _txq_index) \ 136 do { \ 137 struct sfxge_txq *__txq = (_txq); \ 138 \ 139 snprintf((__txq)->lock_name, \ 140 sizeof((__txq)->lock_name), \ 141 "%s:txq%u", (_ifname), (_txq_index)); \ 142 mtx_init(&(__txq)->lock, (__txq)->lock_name, \ 143 NULL, MTX_DEF); \ 144 } while (B_FALSE) 145#define SFXGE_TXQ_LOCK_DESTROY(_txq) \ 146 mtx_destroy(&(_txq)->lock) 147#define SFXGE_TXQ_LOCK(_txq) \ 148 mtx_lock(&(_txq)->lock) 149#define SFXGE_TXQ_TRYLOCK(_txq) \ 150 mtx_trylock(&(_txq)->lock) 151#define SFXGE_TXQ_UNLOCK(_txq) \ 152 mtx_unlock(&(_txq)->lock) 153#define SFXGE_TXQ_LOCK_ASSERT_OWNED(_txq) \ 154 mtx_assert(&(_txq)->lock, MA_OWNED) 155#define SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(_txq) \ 156 mtx_assert(&(_txq)->lock, MA_NOTOWNED) 157 158 159struct sfxge_txq { 160 /* The following fields should be written very rarely */ 161 struct sfxge_softc *sc; 162 enum sfxge_txq_state init_state; 163 enum sfxge_flush_state flush_state; 164 enum sfxge_txq_type type; 165 unsigned int txq_index; 166 unsigned int evq_index; 167 efsys_mem_t mem; 168 unsigned int buf_base_id; 169 unsigned int entries; 170 unsigned int ptr_mask; 171 unsigned int max_pkt_desc; 172 173 struct sfxge_tx_mapping *stmp; /* Packets in flight. */ 174 bus_dma_tag_t packet_dma_tag; 175 efx_desc_t *pend_desc; 176 efx_txq_t *common; 177 178 efsys_mem_t *tsoh_buffer; 179 180 char lock_name[SFXGE_LOCK_NAME_MAX]; 181 182 /* This field changes more often and is read regularly on both 183 * the initiation and completion paths 184 */ 185 int blocked __aligned(CACHE_LINE_SIZE); 186 187 /* The following fields change more often, and are used mostly 188 * on the initiation path 189 */ 190 struct mtx lock __aligned(CACHE_LINE_SIZE); 191 struct sfxge_tx_dpl dpl; /* Deferred packet list. */ 192 unsigned int n_pend_desc; 193 unsigned int added; 194 unsigned int reaped; 195 196 /* The last VLAN TCI seen on the queue if FW-assisted tagging is 197 used */ 198 uint16_t hw_vlan_tci; 199 200 /* Statistics */ 201 unsigned long tso_bursts; 202 unsigned long tso_packets; 203 unsigned long tso_long_headers; 204 unsigned long collapses; 205 unsigned long drops; 206 unsigned long get_overflow; 207 unsigned long get_non_tcp_overflow; 208 unsigned long put_overflow; 209 unsigned long netdown_drops; 210 unsigned long tso_pdrop_too_many; 211 unsigned long tso_pdrop_no_rsrc; 212 213 /* The following fields change more often, and are used mostly 214 * on the completion path 215 */ 216 unsigned int pending __aligned(CACHE_LINE_SIZE); 217 unsigned int completed; 218 struct sfxge_txq *next; 219}; 220 221struct sfxge_evq; 222 223 224extern int sfxge_tx_init(struct sfxge_softc *sc); 225extern void sfxge_tx_fini(struct sfxge_softc *sc); 226extern int sfxge_tx_start(struct sfxge_softc *sc); 227extern void sfxge_tx_stop(struct sfxge_softc *sc); 228extern void sfxge_tx_qcomplete(struct sfxge_txq *txq, struct sfxge_evq *evq); 229extern void sfxge_tx_qflush_done(struct sfxge_txq *txq); 230extern void sfxge_if_qflush(struct ifnet *ifp); 231extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m); 232 233#endif 234