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_RX_H 33 #define _SFXGE_RX_H 34 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #if defined(INET) || defined(INET6) 39 #error LRO 40 #define SFXGE_LRO 1 41 #endif 42 43 #define SFXGE_MAGIC_RESERVED 0x8000 44 45 #define SFXGE_MAGIC_DMAQ_LABEL_WIDTH 6 46 #define SFXGE_MAGIC_DMAQ_LABEL_MASK \ 47 ((1 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH) - 1) 48 49 #define SFXGE_MAGIC_RX_QFLUSH_DONE \ 50 (SFXGE_MAGIC_RESERVED | (1 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH)) 51 52 #define SFXGE_MAGIC_RX_QFLUSH_FAILED \ 53 (SFXGE_MAGIC_RESERVED | (2 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH)) 54 55 #define SFXGE_MAGIC_RX_QREFILL \ 56 (SFXGE_MAGIC_RESERVED | (3 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH)) 57 58 #define SFXGE_MAGIC_TX_QFLUSH_DONE \ 59 (SFXGE_MAGIC_RESERVED | (4 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH)) 60 61 #define SFXGE_RX_SCALE_MAX EFX_MAXRSS 62 63 struct sfxge_rx_sw_desc { 64 struct mbuf *mbuf; 65 bus_dmamap_t map; 66 int flags; 67 int size; 68 }; 69 70 #ifdef SFXGE_LRO 71 72 /** 73 * struct sfxge_lro_conn - Connection state for software LRO 74 * @link: Link for hash table and free list. 75 * @active_link: Link for active_conns list 76 * @l2_id: Identifying information from layer 2 77 * @conn_hash: Hash of connection 4-tuple 78 * @nh: IP (v4 or v6) header of super-packet 79 * @source: Source TCP port number 80 * @dest: Destination TCP port number 81 * @n_in_order_pkts: Number of in-order packets with payload. 82 * @next_seq: Next in-order sequence number. 83 * @last_pkt_ticks: Time we last saw a packet on this connection. 84 * @mbuf: The mbuf we are currently holding. 85 * If %NULL, then all following fields are undefined. 86 * @mbuf_tail: The tail of the frag_list of mbufs we're holding. 87 * Only valid after at least one merge. 88 * @th_last: The TCP header of the last packet merged. 89 * @next_buf: The next RX buffer to process. 90 * @next_eh: Ethernet header of the next buffer. 91 * @next_nh: IP header of the next buffer. 92 * @delivered: True if we've delivered a payload packet up this interrupt. 93 */ 94 struct sfxge_lro_conn { 95 TAILQ_ENTRY(sfxge_lro_conn) link; 96 LIST_ENTRY(sfxge_lro_conn) active_link; 97 uint16_t l2_id; 98 uint32_t conn_hash; 99 void *nh; 100 uint16_t source, dest; 101 int n_in_order_pkts; 102 unsigned next_seq; 103 unsigned last_pkt_ticks; 104 struct mbuf *mbuf; 105 struct mbuf *mbuf_tail; 106 struct tcphdr *th_last; 107 struct sfxge_rx_sw_desc next_buf; 108 void *next_eh; 109 void *next_nh; 110 int delivered; 111 }; 112 113 /** 114 * struct sfxge_lro_state - Port state for software LRO 115 * @sc: The associated NIC. 116 * @conns_mask: Number of hash buckets - 1. 117 * @conns: Hash buckets for tracked connections. 118 * @conns_n: Length of linked list for each hash bucket. 119 * @active_conns: Connections that are holding a packet. 120 * Connections are self-linked when not in this list. 121 * @free_conns: Free sfxge_lro_conn instances. 122 * @last_purge_ticks: The value of ticks last time we purged idle 123 * connections. 124 * @n_merges: Number of packets absorbed by LRO. 125 * @n_bursts: Number of bursts spotted by LRO. 126 * @n_slow_start: Number of packets not merged because connection may be in 127 * slow-start. 128 * @n_misorder: Number of out-of-order packets seen in tracked streams. 129 * @n_too_many: Incremented when we're trying to track too many streams. 130 * @n_new_stream: Number of distinct streams we've tracked. 131 * @n_drop_idle: Number of streams discarded because they went idle. 132 * @n_drop_closed: Number of streams that have seen a FIN or RST. 133 */ 134 struct sfxge_lro_state { 135 struct sfxge_softc *sc; 136 unsigned conns_mask; 137 TAILQ_HEAD(sfxge_lro_tailq, sfxge_lro_conn) *conns; 138 unsigned *conns_n; 139 LIST_HEAD(, sfxge_lro_conn) active_conns; 140 TAILQ_HEAD(, sfxge_lro_conn) free_conns; 141 unsigned last_purge_ticks; 142 unsigned n_merges; 143 unsigned n_bursts; 144 unsigned n_slow_start; 145 unsigned n_misorder; 146 unsigned n_too_many; 147 unsigned n_new_stream; 148 unsigned n_drop_idle; 149 unsigned n_drop_closed; 150 }; 151 152 #endif /* SFXGE_LRO */ 153 154 enum sfxge_flush_state { 155 SFXGE_FLUSH_DONE = 0, 156 SFXGE_FLUSH_PENDING, 157 SFXGE_FLUSH_FAILED 158 }; 159 160 enum sfxge_rxq_state { 161 SFXGE_RXQ_UNINITIALIZED = 0, 162 SFXGE_RXQ_INITIALIZED, 163 SFXGE_RXQ_STARTED 164 }; 165 166 #define SFXGE_RX_BATCH 128 167 168 struct sfxge_rxq { 169 struct sfxge_softc *sc __aligned(CACHE_LINE_SIZE); 170 unsigned int index; 171 efsys_mem_t mem; 172 unsigned int buf_base_id; 173 enum sfxge_rxq_state init_state; 174 unsigned int entries; 175 unsigned int ptr_mask; 176 177 struct sfxge_rx_sw_desc *queue __aligned(CACHE_LINE_SIZE); 178 unsigned int added; 179 unsigned int pending; 180 unsigned int completed; 181 unsigned int loopback; 182 #ifdef SFXGE_LRO 183 struct sfxge_lro_state lro; 184 #endif 185 unsigned int refill_threshold; 186 struct callout refill_callout; 187 unsigned int refill_delay; 188 189 efx_rxq_t *common __aligned(CACHE_LINE_SIZE); 190 volatile enum sfxge_flush_state flush_state; 191 }; 192 193 /* 194 * From sfxge_rx.c. 195 */ 196 extern int sfxge_rx_init(struct sfxge_softc *sc); 197 extern void sfxge_rx_fini(struct sfxge_softc *sc); 198 extern int sfxge_rx_start(struct sfxge_softc *sc); 199 extern void sfxge_rx_stop(struct sfxge_softc *sc); 200 extern void sfxge_rx_qcomplete(struct sfxge_rxq *rxq, boolean_t eop); 201 extern void sfxge_rx_qrefill(struct sfxge_rxq *rxq); 202 extern void sfxge_rx_qflush_done(struct sfxge_rxq *rxq); 203 extern void sfxge_rx_qflush_failed(struct sfxge_rxq *rxq); 204 extern void sfxge_rx_scale_update(void *arg, int npending); 205 206 #endif 207