uipc_mvec.c

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    1 /*-
    2  * Copyright (c) 2007-2008 Kip Macy <kmacy@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.1/sys/dev/cxgb/sys/uipc_mvec.c 251263 2013-06-02 18:10:16Z alc $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/lock.h>
   34 #include <sys/malloc.h>
   35 #include <sys/mbuf.h>
   36 #include <sys/ktr.h>
   37 
   38 #include <vm/vm.h>
   39 #include <vm/pmap.h>
   40 
   41 #include <machine/bus.h>
   42 
   43 #include <cxgb_include.h>
   44 #include <sys/mvec.h>
   45 
   46 #ifdef INVARIANTS
   47 #define M_SANITY m_sanity
   48 #else
   49 #define M_SANITY(a, b)
   50 #endif
   51 
   52 int
   53 busdma_map_sg_collapse(bus_dma_tag_t tag, bus_dmamap_t map,
   54         struct mbuf **m, bus_dma_segment_t *segs, int *nsegs)
   55 {
   56         struct mbuf *n = *m;
   57         int seg_count, defragged = 0, err = 0;
   58         bus_dma_segment_t *psegs;
   59         
   60         KASSERT(n->m_pkthdr.len, ("packet has zero header len"));
   61         if (n->m_pkthdr.len <= PIO_LEN)
   62                 return (0);
   63 retry:
   64         psegs = segs;
   65         seg_count = 0;
   66         if (n->m_next == NULL) {
   67                 busdma_map_mbuf_fast(tag, map, n, segs);
   68                 *nsegs = 1;
   69                 return (0);
   70         }
   71 #if defined(__i386__) || defined(__amd64__)
   72         while (n && seg_count < TX_MAX_SEGS) {
   73                 /*
   74                  * firmware doesn't like empty segments
   75                  */
   76                 if (__predict_true(n->m_len != 0)) {
   77                         seg_count++;
   78                         busdma_map_mbuf_fast(tag, map, n, psegs);
   79                         psegs++;
   80                 }
   81                 n = n->m_next;
   82         }
   83 #else
   84         err = bus_dmamap_load_mbuf_sg(tag, map, *m, segs, &seg_count, 0);
   85 #endif  
   86         if (seg_count == 0) {
   87                 if (cxgb_debug)
   88                         printf("empty segment chain\n");
   89                 err = EFBIG;
   90                 goto err_out;
   91         }  else if (err == EFBIG || seg_count >= TX_MAX_SEGS) {
   92                 if (cxgb_debug)
   93                         printf("mbuf chain too long: %d max allowed %d\n",
   94                             seg_count, TX_MAX_SEGS);
   95                 if (!defragged) {
   96                         n = m_defrag(*m, M_NOWAIT);
   97                         if (n == NULL) {
   98                                 err = ENOBUFS;
   99                                 goto err_out;
  100                         }
  101                         *m = n;
  102                         defragged = 1;
  103                         goto retry;
  104                 }
  105                 err = EFBIG;
  106                 goto err_out;
  107         }
  108 
  109         *nsegs = seg_count;
  110 err_out:        
  111         return (err);
  112 }
  113 
  114 void
  115 busdma_map_sg_vec(bus_dma_tag_t tag, bus_dmamap_t map,
  116     struct mbuf *m, bus_dma_segment_t *segs, int *nsegs)
  117 {
  118 
  119         for (*nsegs = 0; m != NULL ; segs++, *nsegs += 1, m = m->m_nextpkt)
  120                 busdma_map_mbuf_fast(tag, map, m, segs);
  121 }
  122

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FreeBSD/Linux Kernel Cross Reference sys/dev/cxgb/sys/uipc_mvec.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/cxgb/sys/uipc_mvec.c