235 lines
7.0 KiB
C
235 lines
7.0 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 size of TSO packet */
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#define SFXGE_TSO_MAX_SIZE (65535)
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/*
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* Maximum number of segments to be created for a TSO packet.
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* Allow for a reasonable minimum MSS of 512.
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*/
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#define SFXGE_TSO_MAX_SEGS howmany(SFXGE_TSO_MAX_SIZE, 512)
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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 \
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(1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES))
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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 * 1024)
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#define SFXGE_TX_DPL_GET_NON_TCP_PKT_LIMIT_DEFAULT 1024
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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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unsigned int std_get_max; /* Maximum number of packets
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* in get list */
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unsigned int std_get_non_tcp_max; /* Maximum number
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* of non-TCP packets
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* in get list */
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unsigned int std_put_max; /* Maximum number of packets
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* in put list */
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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_get_count; /* Packets in get list. */
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unsigned int std_get_non_tcp_count; /* Non-TCP packets
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* in get list */
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unsigned int std_get_hiwat; /* Packets in get list
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* high watermark */
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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(_entries) (EFX_TXQ_LIMIT(_entries) / 4)
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#define SFXGE_TX_BATCH 64
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#ifdef SFXGE_HAVE_MQ
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#define SFXGE_TX_LOCK(txq) (&(txq)->lock)
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#else
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#define SFXGE_TX_LOCK(txq) (&(txq)->sc->tx_lock)
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#endif
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#define SFXGE_TXQ_LOCK_INIT(_txq, _ifname, _txq_index) \
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do { \
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struct sfxge_txq *__txq = (_txq); \
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\
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snprintf((__txq)->lock_name, \
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sizeof((__txq)->lock_name), \
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"%s:txq%u", (_ifname), (_txq_index)); \
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mtx_init(&(__txq)->lock, (__txq)->lock_name, \
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NULL, MTX_DEF); \
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} while (B_FALSE)
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#define SFXGE_TXQ_LOCK_DESTROY(_txq) \
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mtx_destroy(&(_txq)->lock)
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#define SFXGE_TXQ_LOCK(_txq) \
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mtx_lock(SFXGE_TX_LOCK(_txq))
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#define SFXGE_TXQ_TRYLOCK(_txq) \
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mtx_trylock(SFXGE_TX_LOCK(_txq))
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#define SFXGE_TXQ_UNLOCK(_txq) \
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mtx_unlock(SFXGE_TX_LOCK(_txq))
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#define SFXGE_TXQ_LOCK_ASSERT_OWNED(_txq) \
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mtx_assert(SFXGE_TX_LOCK(_txq), MA_OWNED)
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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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unsigned int entries;
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unsigned int ptr_mask;
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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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efsys_mem_t *tsoh_buffer;
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char lock_name[SFXGE_LOCK_NAME_MAX];
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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 get_overflow;
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unsigned long get_non_tcp_overflow;
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unsigned long put_overflow;
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unsigned long netdown_drops;
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unsigned long tso_pdrop_too_many;
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unsigned long tso_pdrop_no_rsrc;
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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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struct sfxge_txq *next;
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};
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struct sfxge_evq;
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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, struct sfxge_evq *evq);
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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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