190 lines
6.4 KiB
C
190 lines
6.4 KiB
C
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/*-
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* Copyright (c) 2010-2011 Solarflare Communications, Inc.
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* All rights reserved.
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*
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* This software was developed in part by Philip Paeps under contract for
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* Solarflare Communications, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SFXGE_RX_H
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#define _SFXGE_RX_H
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#define SFXGE_MAGIC_RESERVED 0x8000
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#define SFXGE_MAGIC_DMAQ_LABEL_WIDTH 6
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#define SFXGE_MAGIC_DMAQ_LABEL_MASK \
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((1 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH) - 1)
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#define SFXGE_MAGIC_RX_QFLUSH_DONE \
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(SFXGE_MAGIC_RESERVED | (1 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH))
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#define SFXGE_MAGIC_RX_QFLUSH_FAILED \
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(SFXGE_MAGIC_RESERVED | (2 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH))
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#define SFXGE_MAGIC_RX_QREFILL \
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(SFXGE_MAGIC_RESERVED | (3 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH))
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#define SFXGE_MAGIC_TX_QFLUSH_DONE \
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(SFXGE_MAGIC_RESERVED | (4 << SFXGE_MAGIC_DMAQ_LABEL_WIDTH))
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#define SFXGE_RX_SCALE_MAX EFX_MAXRSS
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struct sfxge_rx_sw_desc {
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struct mbuf *mbuf;
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bus_dmamap_t map;
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int flags;
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int size;
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};
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/**
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* struct sfxge_lro_conn - Connection state for software LRO
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* @link: Link for hash table and free list.
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* @active_link: Link for active_conns list
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* @l2_id: Identifying information from layer 2
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* @conn_hash: Hash of connection 4-tuple
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* @nh: IP (v4 or v6) header of super-packet
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* @source: Source TCP port number
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* @dest: Destination TCP port number
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* @n_in_order_pkts: Number of in-order packets with payload.
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* @next_seq: Next in-order sequence number.
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* @last_pkt_ticks: Time we last saw a packet on this connection.
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* @mbuf: The mbuf we are currently holding.
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* If %NULL, then all following fields are undefined.
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* @mbuf_tail: The tail of the frag_list of mbufs we're holding.
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* Only valid after at least one merge.
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* @th_last: The TCP header of the last packet merged.
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* @next_buf: The next RX buffer to process.
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* @next_eh: Ethernet header of the next buffer.
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* @next_nh: IP header of the next buffer.
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* @delivered: True if we've delivered a payload packet up this interrupt.
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*/
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struct sfxge_lro_conn {
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TAILQ_ENTRY(sfxge_lro_conn) link;
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LIST_ENTRY(sfxge_lro_conn) active_link;
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uint16_t l2_id;
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uint32_t conn_hash;
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void *nh;
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uint16_t source, dest;
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int n_in_order_pkts;
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unsigned next_seq;
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unsigned last_pkt_ticks;
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struct mbuf *mbuf;
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struct mbuf *mbuf_tail;
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struct tcphdr *th_last;
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struct sfxge_rx_sw_desc next_buf;
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void *next_eh;
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void *next_nh;
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int delivered;
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};
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/**
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* struct sfxge_lro_state - Port state for software LRO
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* @sc: The associated NIC.
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* @conns_mask: Number of hash buckets - 1.
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* @conns: Hash buckets for tracked connections.
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* @conns_n: Length of linked list for each hash bucket.
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* @active_conns: Connections that are holding a packet.
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* Connections are self-linked when not in this list.
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* @free_conns: Free sfxge_lro_conn instances.
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* @last_purge_ticks: The value of ticks last time we purged idle
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* connections.
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* @n_merges: Number of packets absorbed by LRO.
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* @n_bursts: Number of bursts spotted by LRO.
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* @n_slow_start: Number of packets not merged because connection may be in
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* slow-start.
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* @n_misorder: Number of out-of-order packets seen in tracked streams.
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* @n_too_many: Incremented when we're trying to track too many streams.
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* @n_new_stream: Number of distinct streams we've tracked.
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* @n_drop_idle: Number of streams discarded because they went idle.
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* @n_drop_closed: Number of streams that have seen a FIN or RST.
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*/
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struct sfxge_lro_state {
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struct sfxge_softc *sc;
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unsigned conns_mask;
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TAILQ_HEAD(sfxge_lro_tailq, sfxge_lro_conn) *conns;
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unsigned *conns_n;
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LIST_HEAD(, sfxge_lro_conn) active_conns;
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TAILQ_HEAD(, sfxge_lro_conn) free_conns;
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unsigned last_purge_ticks;
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unsigned n_merges;
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unsigned n_bursts;
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unsigned n_slow_start;
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unsigned n_misorder;
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unsigned n_too_many;
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unsigned n_new_stream;
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unsigned n_drop_idle;
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unsigned n_drop_closed;
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};
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enum sfxge_flush_state {
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SFXGE_FLUSH_DONE = 0,
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SFXGE_FLUSH_PENDING,
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SFXGE_FLUSH_FAILED
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};
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enum sfxge_rxq_state {
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SFXGE_RXQ_UNINITIALIZED = 0,
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SFXGE_RXQ_INITIALIZED,
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SFXGE_RXQ_STARTED
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};
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#define SFXGE_RX_BATCH 128
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struct sfxge_rxq {
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struct sfxge_softc *sc __aligned(CACHE_LINE_SIZE);
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unsigned int index;
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efsys_mem_t mem;
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unsigned int buf_base_id;
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enum sfxge_rxq_state init_state;
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struct sfxge_rx_sw_desc *queue __aligned(CACHE_LINE_SIZE);
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unsigned int added;
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unsigned int pending;
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unsigned int completed;
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unsigned int loopback;
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struct sfxge_lro_state lro;
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struct callout refill_callout;
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unsigned int refill_delay;
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efx_rxq_t *common __aligned(CACHE_LINE_SIZE);
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volatile enum sfxge_flush_state flush_state;
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};
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/*
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* From sfxge_rx.c.
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*/
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extern int sfxge_rx_init(struct sfxge_softc *sc);
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extern void sfxge_rx_fini(struct sfxge_softc *sc);
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extern int sfxge_rx_start(struct sfxge_softc *sc);
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extern void sfxge_rx_stop(struct sfxge_softc *sc);
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extern void sfxge_rx_qcomplete(struct sfxge_rxq *rxq, boolean_t eop);
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extern void sfxge_rx_qrefill(struct sfxge_rxq *rxq);
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extern void sfxge_rx_qflush_done(struct sfxge_rxq *rxq);
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extern void sfxge_rx_qflush_failed(struct sfxge_rxq *rxq);
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extern void sfxge_rx_scale_update(void *arg, int npending);
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#endif
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