c1974e298d
Previous implementation limits put queue size only (when Tx lock can't be acquired), but get queue may grow unboundedly which results in mbuf pools exhaustion and latency growth. Submitted by: Andrew Rybchenko <Andrew.Rybchenko at oktetlabs.ru> Sponsored by: Solarflare Communications, Inc.
188 lines
5.6 KiB
C
188 lines
5.6 KiB
C
/*-
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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_TX_H
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#define _SFXGE_TX_H
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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/* Maximum number of DMA segments needed to map an mbuf chain. With
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* TSO, the mbuf length may be just over 64K, divided into 2K mbuf
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* clusters. (The chain could be longer than this initially, but can
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* be shortened with m_collapse().)
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*/
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#define SFXGE_TX_MAPPING_MAX_SEG (64 / 2 + 1)
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/* Maximum number of DMA segments needed to map an output packet. It
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* could overlap all mbufs in the chain and also require an extra
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* segment for a TSO header.
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*/
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#define SFXGE_TX_PACKET_MAX_SEG (SFXGE_TX_MAPPING_MAX_SEG + 1)
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/*
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* Buffer mapping flags.
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*
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* Buffers and DMA mappings must be freed when the last descriptor
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* referring to them is completed. Set the TX_BUF_UNMAP and
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* TX_BUF_MBUF flags on the last descriptor generated for an mbuf
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* chain. Set only the TX_BUF_UNMAP flag on a descriptor referring to
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* a heap buffer.
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*/
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enum sfxge_tx_buf_flags {
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TX_BUF_UNMAP = 1,
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TX_BUF_MBUF = 2,
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};
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/*
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* Buffer mapping information for descriptors in flight.
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*/
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struct sfxge_tx_mapping {
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union {
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struct mbuf *mbuf;
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caddr_t heap_buf;
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} u;
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bus_dmamap_t map;
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enum sfxge_tx_buf_flags flags;
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};
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#define SFXGE_TX_DPL_GET_PKT_LIMIT_DEFAULT 64
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#define SFXGE_TX_DPL_PUT_PKT_LIMIT_DEFAULT 64
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/*
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* Deferred packet list.
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*/
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struct sfxge_tx_dpl {
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uintptr_t std_put; /* Head of put list. */
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struct mbuf *std_get; /* Head of get list. */
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struct mbuf **std_getp; /* Tail of get list. */
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unsigned int std_count; /* Count of packets. */
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};
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#define SFXGE_TX_BUFFER_SIZE 0x400
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#define SFXGE_TX_HEADER_SIZE 0x100
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#define SFXGE_TX_COPY_THRESHOLD 0x200
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enum sfxge_txq_state {
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SFXGE_TXQ_UNINITIALIZED = 0,
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SFXGE_TXQ_INITIALIZED,
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SFXGE_TXQ_STARTED
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};
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enum sfxge_txq_type {
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SFXGE_TXQ_NON_CKSUM = 0,
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SFXGE_TXQ_IP_CKSUM,
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SFXGE_TXQ_IP_TCP_UDP_CKSUM,
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SFXGE_TXQ_NTYPES
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};
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#define SFXGE_TXQ_UNBLOCK_LEVEL (EFX_TXQ_LIMIT(SFXGE_NDESCS) / 4)
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#define SFXGE_TX_BATCH 64
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#ifdef SFXGE_HAVE_MQ
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#define SFXGE_TXQ_LOCK(txq) (&(txq)->lock)
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#define SFXGE_TX_SCALE(sc) ((sc)->intr.n_alloc)
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#else
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#define SFXGE_TXQ_LOCK(txq) (&(txq)->sc->tx_lock)
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#define SFXGE_TX_SCALE(sc) 1
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#endif
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struct sfxge_txq {
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/* The following fields should be written very rarely */
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struct sfxge_softc *sc;
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enum sfxge_txq_state init_state;
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enum sfxge_flush_state flush_state;
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enum sfxge_txq_type type;
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unsigned int txq_index;
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unsigned int evq_index;
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efsys_mem_t mem;
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unsigned int buf_base_id;
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struct sfxge_tx_mapping *stmp; /* Packets in flight. */
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bus_dma_tag_t packet_dma_tag;
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efx_buffer_t *pend_desc;
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efx_txq_t *common;
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struct sfxge_txq *next;
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efsys_mem_t *tsoh_buffer;
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/* This field changes more often and is read regularly on both
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* the initiation and completion paths
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*/
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int blocked __aligned(CACHE_LINE_SIZE);
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/* The following fields change more often, and are used mostly
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* on the initiation path
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*/
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#ifdef SFXGE_HAVE_MQ
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struct mtx lock __aligned(CACHE_LINE_SIZE);
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struct sfxge_tx_dpl dpl; /* Deferred packet list. */
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unsigned int n_pend_desc;
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#else
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unsigned int n_pend_desc __aligned(CACHE_LINE_SIZE);
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#endif
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unsigned int added;
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unsigned int reaped;
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/* Statistics */
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unsigned long tso_bursts;
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unsigned long tso_packets;
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unsigned long tso_long_headers;
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unsigned long collapses;
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unsigned long drops;
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unsigned long early_drops;
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/* The following fields change more often, and are used mostly
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* on the completion path
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*/
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unsigned int pending __aligned(CACHE_LINE_SIZE);
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unsigned int completed;
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};
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extern int sfxge_tx_packet_add(struct sfxge_txq *, struct mbuf *);
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extern int sfxge_tx_init(struct sfxge_softc *sc);
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extern void sfxge_tx_fini(struct sfxge_softc *sc);
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extern int sfxge_tx_start(struct sfxge_softc *sc);
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extern void sfxge_tx_stop(struct sfxge_softc *sc);
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extern void sfxge_tx_qcomplete(struct sfxge_txq *txq);
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extern void sfxge_tx_qflush_done(struct sfxge_txq *txq);
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#ifdef SFXGE_HAVE_MQ
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extern void sfxge_if_qflush(struct ifnet *ifp);
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extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m);
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#else
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extern void sfxge_if_start(struct ifnet *ifp);
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#endif
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#endif
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