sfxge_tx.h

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    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: releng/9.2/sys/dev/sfxge/sfxge_tx.h 227569 2011-11-16 17:11:13Z philip $
   30  */
   31 
   32 #ifndef _SFXGE_TX_H
   33 #define _SFXGE_TX_H
   34 
   35 #include <netinet/in.h>
   36 #include <netinet/ip.h>
   37 #include <netinet/tcp.h>
   38 
   39 /* Maximum number of DMA segments needed to map an mbuf chain.  With
   40  * TSO, the mbuf length may be just over 64K, divided into 2K mbuf
   41  * clusters.  (The chain could be longer than this initially, but can
   42  * be shortened with m_collapse().)
   43  */
   44 #define SFXGE_TX_MAPPING_MAX_SEG (64 / 2 + 1)
   45 
   46 /* Maximum number of DMA segments needed to map an output packet.  It
   47  * could overlap all mbufs in the chain and also require an extra
   48  * segment for a TSO header.
   49  */
   50 #define SFXGE_TX_PACKET_MAX_SEG (SFXGE_TX_MAPPING_MAX_SEG + 1)
   51 
   52 /*
   53  * Buffer mapping flags.
   54  *
   55  * Buffers and DMA mappings must be freed when the last descriptor
   56  * referring to them is completed.  Set the TX_BUF_UNMAP and
   57  * TX_BUF_MBUF flags on the last descriptor generated for an mbuf
   58  * chain.  Set only the TX_BUF_UNMAP flag on a descriptor referring to
   59  * a heap buffer.
   60  */
   61 enum sfxge_tx_buf_flags {
   62         TX_BUF_UNMAP = 1,
   63         TX_BUF_MBUF = 2,
   64 };
   65 
   66 /*
   67  * Buffer mapping information for descriptors in flight.
   68  */
   69 struct sfxge_tx_mapping {
   70         union {
   71                 struct mbuf     *mbuf;
   72                 caddr_t         heap_buf;
   73         }                       u;
   74         bus_dmamap_t            map;
   75         enum sfxge_tx_buf_flags flags;
   76 };
   77 
   78 #define SFXGE_TX_MAX_DEFERRED 64
   79 
   80 /*
   81  * Deferred packet list.
   82  */
   83 struct sfxge_tx_dpl {
   84         uintptr_t               std_put;    /* Head of put list. */
   85         struct mbuf             *std_get;   /* Head of get list. */
   86         struct mbuf             **std_getp; /* Tail of get list. */
   87         unsigned int            std_count;  /* Count of packets. */
   88 };
   89 
   90 
   91 #define SFXGE_TX_BUFFER_SIZE    0x400
   92 #define SFXGE_TX_HEADER_SIZE    0x100
   93 #define SFXGE_TX_COPY_THRESHOLD 0x200
   94 
   95 enum sfxge_txq_state {
   96         SFXGE_TXQ_UNINITIALIZED = 0,
   97         SFXGE_TXQ_INITIALIZED,
   98         SFXGE_TXQ_STARTED
   99 };
  100 
  101 enum sfxge_txq_type {
  102         SFXGE_TXQ_NON_CKSUM = 0,
  103         SFXGE_TXQ_IP_CKSUM,
  104         SFXGE_TXQ_IP_TCP_UDP_CKSUM,
  105         SFXGE_TXQ_NTYPES
  106 };
  107 
  108 #define SFXGE_TXQ_UNBLOCK_LEVEL         (EFX_TXQ_LIMIT(SFXGE_NDESCS) / 4)
  109 
  110 #define SFXGE_TX_BATCH  64
  111 
  112 #ifdef SFXGE_HAVE_MQ
  113 #define SFXGE_TXQ_LOCK(txq)             (&(txq)->lock)
  114 #define SFXGE_TX_SCALE(sc)              ((sc)->intr.n_alloc)
  115 #else
  116 #define SFXGE_TXQ_LOCK(txq)             (&(txq)->sc->tx_lock)
  117 #define SFXGE_TX_SCALE(sc)              1
  118 #endif
  119 
  120 struct sfxge_txq {
  121         /* The following fields should be written very rarely */
  122         struct sfxge_softc              *sc;
  123         enum sfxge_txq_state            init_state;
  124         enum sfxge_flush_state          flush_state;
  125         enum sfxge_txq_type             type;
  126         unsigned int                    txq_index;
  127         unsigned int                    evq_index;
  128         efsys_mem_t                     mem;
  129         unsigned int                    buf_base_id;
  130 
  131         struct sfxge_tx_mapping         *stmp;  /* Packets in flight. */
  132         bus_dma_tag_t                   packet_dma_tag;
  133         efx_buffer_t                    *pend_desc;
  134         efx_txq_t                       *common;
  135         struct sfxge_txq                *next;
  136 
  137         efsys_mem_t                     *tsoh_buffer;
  138 
  139         /* This field changes more often and is read regularly on both
  140          * the initiation and completion paths
  141          */
  142         int                             blocked __aligned(CACHE_LINE_SIZE);
  143 
  144         /* The following fields change more often, and are used mostly
  145          * on the initiation path
  146          */
  147 #ifdef SFXGE_HAVE_MQ
  148         struct mtx                      lock __aligned(CACHE_LINE_SIZE);
  149         struct sfxge_tx_dpl             dpl;    /* Deferred packet list. */
  150         unsigned int                    n_pend_desc;
  151 #else
  152         unsigned int                    n_pend_desc __aligned(CACHE_LINE_SIZE);
  153 #endif
  154         unsigned int                    added;
  155         unsigned int                    reaped;
  156         /* Statistics */
  157         unsigned long                   tso_bursts;
  158         unsigned long                   tso_packets;
  159         unsigned long                   tso_long_headers;
  160         unsigned long                   collapses;
  161         unsigned long                   drops;
  162 
  163         /* The following fields change more often, and are used mostly
  164          * on the completion path
  165          */
  166         unsigned int                    pending __aligned(CACHE_LINE_SIZE);
  167         unsigned int                    completed;
  168 };
  169 
  170 extern int sfxge_tx_packet_add(struct sfxge_txq *, struct mbuf *);
  171 
  172 extern int sfxge_tx_init(struct sfxge_softc *sc);
  173 extern void sfxge_tx_fini(struct sfxge_softc *sc);
  174 extern int sfxge_tx_start(struct sfxge_softc *sc);
  175 extern void sfxge_tx_stop(struct sfxge_softc *sc);
  176 extern void sfxge_tx_qcomplete(struct sfxge_txq *txq);
  177 extern void sfxge_tx_qflush_done(struct sfxge_txq *txq);
  178 #ifdef SFXGE_HAVE_MQ
  179 extern void sfxge_if_qflush(struct ifnet *ifp);
  180 extern int sfxge_if_transmit(struct ifnet *ifp, struct mbuf *m);
  181 #else
  182 extern void sfxge_if_start(struct ifnet *ifp);
  183 #endif
  184 
  185 #endif

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FreeBSD/Linux Kernel Cross Reference sys/dev/sfxge/sfxge_tx.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/sfxge/sfxge_tx.h