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