uipc_mvec.c

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

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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