1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010-2016 Solarflare Communications Inc. 5 * All rights reserved. 6 * 7 * This software was developed in part by Philip Paeps under contract for 8 * Solarflare Communications, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 29 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * The views and conclusions contained in the software and documentation are 32 * those of the authors and should not be interpreted as representing official 33 * policies, either expressed or implied, of the FreeBSD Project. 34 */ 35 36 #ifndef _SFXGE_RX_H 37 #define _SFXGE_RX_H 38 39 #include "opt_inet.h" 40 #include "opt_inet6.h" 41 42 #if defined(INET) || defined(INET6) 43 #define SFXGE_LRO 1 44 #endif 45 46 #define SFXGE_RX_SCALE_MAX EFX_MAXRSS 47 48 struct sfxge_rx_sw_desc { 49 struct mbuf *mbuf; 50 bus_dmamap_t map; 51 int flags; 52 int size; 53 }; 54 55 #ifdef SFXGE_LRO 56 57 /** 58 * struct sfxge_lro_conn - Connection state for software LRO 59 * @link: Link for hash table and free list. 60 * @active_link: Link for active_conns list 61 * @l2_id: Identifying information from layer 2 62 * @conn_hash: Hash of connection 4-tuple 63 * @nh: IP (v4 or v6) header of super-packet 64 * @source: Source TCP port number 65 * @dest: Destination TCP port number 66 * @n_in_order_pkts: Number of in-order packets with payload. 67 * @next_seq: Next in-order sequence number. 68 * @last_pkt_ticks: Time we last saw a packet on this connection. 69 * @mbuf: The mbuf we are currently holding. 70 * If %NULL, then all following fields are undefined. 71 * @mbuf_tail: The tail of the frag_list of mbufs we're holding. 72 * Only valid after at least one merge. 73 * @th_last: The TCP header of the last packet merged. 74 * @next_buf: The next RX buffer to process. 75 * @next_eh: Ethernet header of the next buffer. 76 * @next_nh: IP header of the next buffer. 77 * @delivered: True if we've delivered a payload packet up this interrupt. 78 */ 79 struct sfxge_lro_conn { 80 TAILQ_ENTRY(sfxge_lro_conn) link; 81 LIST_ENTRY(sfxge_lro_conn) active_link; 82 uint16_t l2_id; 83 uint32_t conn_hash; 84 void *nh; 85 uint16_t source, dest; 86 int n_in_order_pkts; 87 unsigned next_seq; 88 unsigned last_pkt_ticks; 89 struct mbuf *mbuf; 90 struct mbuf *mbuf_tail; 91 struct tcphdr *th_last; 92 struct sfxge_rx_sw_desc next_buf; 93 void *next_eh; 94 void *next_nh; 95 int delivered; 96 }; 97 98 /** 99 * struct sfxge_lro_state - Port state for software LRO 100 * @sc: The associated NIC. 101 * @conns_mask: Number of hash buckets - 1. 102 * @conns: Hash buckets for tracked connections. 103 * @conns_n: Length of linked list for each hash bucket. 104 * @active_conns: Connections that are holding a packet. 105 * Connections are self-linked when not in this list. 106 * @free_conns: Free sfxge_lro_conn instances. 107 * @last_purge_ticks: The value of ticks last time we purged idle 108 * connections. 109 * @n_merges: Number of packets absorbed by LRO. 110 * @n_bursts: Number of bursts spotted by LRO. 111 * @n_slow_start: Number of packets not merged because connection may be in 112 * slow-start. 113 * @n_misorder: Number of out-of-order packets seen in tracked streams. 114 * @n_too_many: Incremented when we're trying to track too many streams. 115 * @n_new_stream: Number of distinct streams we've tracked. 116 * @n_drop_idle: Number of streams discarded because they went idle. 117 * @n_drop_closed: Number of streams that have seen a FIN or RST. 118 */ 119 struct sfxge_lro_state { 120 struct sfxge_softc *sc; 121 unsigned conns_mask; 122 TAILQ_HEAD(sfxge_lro_tailq, sfxge_lro_conn) *conns; 123 unsigned *conns_n; 124 LIST_HEAD(, sfxge_lro_conn) active_conns; 125 TAILQ_HEAD(, sfxge_lro_conn) free_conns; 126 unsigned last_purge_ticks; 127 unsigned n_merges; 128 unsigned n_bursts; 129 unsigned n_slow_start; 130 unsigned n_misorder; 131 unsigned n_too_many; 132 unsigned n_new_stream; 133 unsigned n_drop_idle; 134 unsigned n_drop_closed; 135 }; 136 137 #endif /* SFXGE_LRO */ 138 139 enum sfxge_flush_state { 140 SFXGE_FLUSH_DONE = 0, 141 SFXGE_FLUSH_REQUIRED, 142 SFXGE_FLUSH_PENDING, 143 SFXGE_FLUSH_FAILED 144 }; 145 146 enum sfxge_rxq_state { 147 SFXGE_RXQ_UNINITIALIZED = 0, 148 SFXGE_RXQ_INITIALIZED, 149 SFXGE_RXQ_STARTED 150 }; 151 152 #define SFXGE_RX_BATCH 128 153 154 struct sfxge_rxq { 155 struct sfxge_softc *sc __aligned(CACHE_LINE_SIZE); 156 unsigned int index; 157 efsys_mem_t mem; 158 enum sfxge_rxq_state init_state; 159 unsigned int entries; 160 unsigned int ptr_mask; 161 efx_rxq_t *common; 162 163 struct sfxge_rx_sw_desc *queue __aligned(CACHE_LINE_SIZE); 164 unsigned int added; 165 unsigned int pushed; 166 unsigned int pending; 167 unsigned int completed; 168 unsigned int loopback; 169 #ifdef SFXGE_LRO 170 struct sfxge_lro_state lro; 171 #endif 172 unsigned int refill_threshold; 173 struct callout refill_callout; 174 unsigned int refill_delay; 175 176 volatile enum sfxge_flush_state flush_state __aligned(CACHE_LINE_SIZE); 177 unsigned int buf_base_id; 178 }; 179 180 /* 181 * From sfxge_rx.c. 182 */ 183 extern int sfxge_rx_init(struct sfxge_softc *sc); 184 extern void sfxge_rx_fini(struct sfxge_softc *sc); 185 extern int sfxge_rx_start(struct sfxge_softc *sc); 186 extern void sfxge_rx_stop(struct sfxge_softc *sc); 187 extern void sfxge_rx_qcomplete(struct sfxge_rxq *rxq, boolean_t eop); 188 extern void sfxge_rx_qrefill(struct sfxge_rxq *rxq); 189 extern void sfxge_rx_qflush_done(struct sfxge_rxq *rxq); 190 extern void sfxge_rx_qflush_failed(struct sfxge_rxq *rxq); 191 extern void sfxge_rx_scale_update(void *arg, int npending); 192 193 #endif 194