2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010-2016 Solarflare Communications Inc.
7 * This software was developed in part by Philip Paeps under contract for
8 * Solarflare Communications, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions are met:
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.
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
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31 * The views and conclusions contained in the software and documentation are
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42 #include "opt_inet6.h"
44 #if defined(INET) || defined(INET6)
48 #define SFXGE_RX_SCALE_MAX EFX_MAXRSS
50 struct sfxge_rx_sw_desc {
60 * struct sfxge_lro_conn - Connection state for software LRO
61 * @link: Link for hash table and free list.
62 * @active_link: Link for active_conns list
63 * @l2_id: Identifying information from layer 2
64 * @conn_hash: Hash of connection 4-tuple
65 * @nh: IP (v4 or v6) header of super-packet
66 * @source: Source TCP port number
67 * @dest: Destination TCP port number
68 * @n_in_order_pkts: Number of in-order packets with payload.
69 * @next_seq: Next in-order sequence number.
70 * @last_pkt_ticks: Time we last saw a packet on this connection.
71 * @mbuf: The mbuf we are currently holding.
72 * If %NULL, then all following fields are undefined.
73 * @mbuf_tail: The tail of the frag_list of mbufs we're holding.
74 * Only valid after at least one merge.
75 * @th_last: The TCP header of the last packet merged.
76 * @next_buf: The next RX buffer to process.
77 * @next_eh: Ethernet header of the next buffer.
78 * @next_nh: IP header of the next buffer.
79 * @delivered: True if we've delivered a payload packet up this interrupt.
81 struct sfxge_lro_conn {
82 TAILQ_ENTRY(sfxge_lro_conn) link;
83 LIST_ENTRY(sfxge_lro_conn) active_link;
87 uint16_t source, dest;
90 unsigned last_pkt_ticks;
92 struct mbuf *mbuf_tail;
93 struct tcphdr *th_last;
94 struct sfxge_rx_sw_desc next_buf;
101 * struct sfxge_lro_state - Port state for software LRO
102 * @sc: The associated NIC.
103 * @conns_mask: Number of hash buckets - 1.
104 * @conns: Hash buckets for tracked connections.
105 * @conns_n: Length of linked list for each hash bucket.
106 * @active_conns: Connections that are holding a packet.
107 * Connections are self-linked when not in this list.
108 * @free_conns: Free sfxge_lro_conn instances.
109 * @last_purge_ticks: The value of ticks last time we purged idle
111 * @n_merges: Number of packets absorbed by LRO.
112 * @n_bursts: Number of bursts spotted by LRO.
113 * @n_slow_start: Number of packets not merged because connection may be in
115 * @n_misorder: Number of out-of-order packets seen in tracked streams.
116 * @n_too_many: Incremented when we're trying to track too many streams.
117 * @n_new_stream: Number of distinct streams we've tracked.
118 * @n_drop_idle: Number of streams discarded because they went idle.
119 * @n_drop_closed: Number of streams that have seen a FIN or RST.
121 struct sfxge_lro_state {
122 struct sfxge_softc *sc;
124 TAILQ_HEAD(sfxge_lro_tailq, sfxge_lro_conn) *conns;
126 LIST_HEAD(, sfxge_lro_conn) active_conns;
127 TAILQ_HEAD(, sfxge_lro_conn) free_conns;
128 unsigned last_purge_ticks;
131 unsigned n_slow_start;
134 unsigned n_new_stream;
135 unsigned n_drop_idle;
136 unsigned n_drop_closed;
139 #endif /* SFXGE_LRO */
141 enum sfxge_flush_state {
142 SFXGE_FLUSH_DONE = 0,
143 SFXGE_FLUSH_REQUIRED,
148 enum sfxge_rxq_state {
149 SFXGE_RXQ_UNINITIALIZED = 0,
150 SFXGE_RXQ_INITIALIZED,
154 #define SFXGE_RX_BATCH 128
157 struct sfxge_softc *sc __aligned(CACHE_LINE_SIZE);
160 enum sfxge_rxq_state init_state;
161 unsigned int entries;
162 unsigned int ptr_mask;
165 struct sfxge_rx_sw_desc *queue __aligned(CACHE_LINE_SIZE);
168 unsigned int pending;
169 unsigned int completed;
170 unsigned int loopback;
172 struct sfxge_lro_state lro;
174 unsigned int refill_threshold;
175 struct callout refill_callout;
176 unsigned int refill_delay;
178 volatile enum sfxge_flush_state flush_state __aligned(CACHE_LINE_SIZE);
179 unsigned int buf_base_id;
185 extern int sfxge_rx_init(struct sfxge_softc *sc);
186 extern void sfxge_rx_fini(struct sfxge_softc *sc);
187 extern int sfxge_rx_start(struct sfxge_softc *sc);
188 extern void sfxge_rx_stop(struct sfxge_softc *sc);
189 extern void sfxge_rx_qcomplete(struct sfxge_rxq *rxq, boolean_t eop);
190 extern void sfxge_rx_qrefill(struct sfxge_rxq *rxq);
191 extern void sfxge_rx_qflush_done(struct sfxge_rxq *rxq);
192 extern void sfxge_rx_qflush_failed(struct sfxge_rxq *rxq);
193 extern void sfxge_rx_scale_update(void *arg, int npending);