if_uba.c

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    1 /*      $NetBSD: if_uba.c,v 1.24 2003/08/07 16:31:15 agc Exp $  */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
    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  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)if_uba.c    7.16 (Berkeley) 12/16/90
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: if_uba.c,v 1.24 2003/08/07 16:31:15 agc Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/socket.h>
   42 #include <sys/device.h>
   43 
   44 #include <uvm/uvm_extern.h>
   45 
   46 #include <net/if.h>
   47 
   48 #include <machine/bus.h>
   49 
   50 #include <dev/qbus/if_uba.h>
   51 #include <dev/qbus/ubareg.h>
   52 #include <dev/qbus/ubavar.h>
   53 
   54 static  struct mbuf *getmcl(void);
   55 
   56 /*
   57  * Routines supporting UNIBUS network interfaces.
   58  *
   59  * TODO:
   60  *      Support interfaces using only one BDP statically.
   61  */
   62 
   63 /*
   64  * Init UNIBUS for interface whose headers of size hlen are to
   65  * end on a page boundary.  We allocate a UNIBUS map register for the page
   66  * with the header, and nmr more UNIBUS map registers for i/o on the adapter,
   67  * doing this once for each read and once for each write buffer.  We also
   68  * allocate page frames in the mbuffer pool for these pages.
   69  *
   70  * Recent changes:
   71  *      No special "header pages" anymore.
   72  *      Recv packets are always put in clusters.
   73  *      "size" is the maximum buffer size, may not be bigger than MCLBYTES.
   74  */
   75 int
   76 if_ubaminit(struct ifubinfo *ifu, struct uba_softc *uh, int size,
   77     struct ifrw *ifr, int nr, struct ifxmt *ifw, int nw)
   78 {
   79         struct mbuf *m;
   80         int totsz, i, error, rseg, nm = nr;
   81         bus_dma_segment_t seg;
   82         caddr_t vaddr;
   83 
   84 #ifdef DIAGNOSTIC
   85         if (size > MCLBYTES)
   86                 panic("if_ubaminit: size > MCLBYTES");
   87 #endif
   88         ifu->iff_softc = uh;
   89         /*
   90          * Get DMA memory for transmit buffers.
   91          * Buffer size are rounded up to a multiple of the uba page size,
   92          * then allocated contiguous.
   93          */
   94         size = (size + UBA_PGOFSET) & ~UBA_PGOFSET;
   95         totsz = size * nw;
   96         if ((error = bus_dmamem_alloc(uh->uh_dmat, totsz, PAGE_SIZE, 0,
   97             &seg, 1, &rseg, BUS_DMA_NOWAIT)))
   98                 return error;
   99         if ((error = bus_dmamem_map(uh->uh_dmat, &seg, rseg, totsz, &vaddr,
  100             BUS_DMA_NOWAIT|BUS_DMA_COHERENT))) {
  101                 bus_dmamem_free(uh->uh_dmat, &seg, rseg);
  102                 return error;
  103         }
  104 
  105         /*
  106          * Create receive and transmit maps.
  107          * Alloc all resources now so we won't fail in the future.
  108          */
  109 
  110         for (i = 0; i < nr; i++) {
  111                 if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
  112                     size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
  113                     &ifr[i].ifrw_map))) {
  114                         nr = i;
  115                         nm = nw = 0;
  116                         goto bad;
  117                 }
  118         }
  119         for (i = 0; i < nw; i++) {
  120                 if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
  121                     size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
  122                     &ifw[i].ifw_map))) {
  123                         nw = i;
  124                         nm = 0;
  125                         goto bad;
  126                 }
  127         }
  128         /*
  129          * Preload the rx maps with mbuf clusters.
  130          */
  131         for (i = 0; i < nm; i++) {
  132                 if ((m = getmcl()) == NULL) {
  133                         nm = i;
  134                         goto bad;
  135                 }
  136                 ifr[i].ifrw_mbuf = m;
  137                 bus_dmamap_load(uh->uh_dmat, ifr[i].ifrw_map,
  138                     m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT);
  139                 
  140         }
  141         /*
  142          * Load the tx maps with DMA memory (common case).
  143          */
  144         for (i = 0; i < nw; i++) {
  145                 ifw[i].ifw_vaddr = vaddr + size * i;
  146                 ifw[i].ifw_size = size;
  147                 bus_dmamap_load(uh->uh_dmat, ifw[i].ifw_map, 
  148                     ifw[i].ifw_vaddr, ifw[i].ifw_size, NULL, BUS_DMA_NOWAIT);
  149         }
  150         return 0;
  151 bad:
  152         while (--nm >= 0) {
  153                 bus_dmamap_unload(uh->uh_dmat, ifr[nw].ifrw_map);
  154                 m_freem(ifr[nm].ifrw_mbuf);
  155         }
  156         while (--nw >= 0)
  157                 bus_dmamap_destroy(uh->uh_dmat, ifw[nw].ifw_map);
  158         while (--nr >= 0)
  159                 bus_dmamap_destroy(uh->uh_dmat, ifr[nw].ifrw_map);
  160         return (0);
  161 }
  162 
  163 struct mbuf *
  164 getmcl()
  165 {
  166         struct mbuf *m;
  167 
  168         MGETHDR(m, M_DONTWAIT, MT_DATA);
  169         if (m == NULL)
  170                 return 0;
  171         MCLGET(m, M_DONTWAIT);
  172         if ((m->m_flags & M_EXT) == 0) {
  173                 m_freem(m);
  174                 return 0;
  175         }
  176         return m;
  177 }
  178 
  179 /*
  180  * Pull read data off a interface.
  181  * Totlen is length of data, with local net header stripped.
  182  * When full cluster sized units are present
  183  * on the interface on cluster boundaries we can get them more
  184  * easily by remapping, and take advantage of this here.
  185  * Save a pointer to the interface structure and the total length,
  186  * so that protocols can determine where incoming packets arrived.
  187  * Note: we may be called to receive from a transmit buffer by some
  188  * devices.  In that case, we must force normal mapping of the buffer,
  189  * so that the correct data will appear (only unibus maps are 
  190  * changed when remapping the transmit buffers).
  191  */
  192 struct mbuf *
  193 if_ubaget(struct ifubinfo *ifu, struct ifrw *ifr, struct ifnet *ifp, int len)
  194 {
  195         struct uba_softc *uh = ifu->iff_softc;
  196         struct mbuf *m, *mn;
  197 
  198         if ((mn = getmcl()) == NULL)
  199                 return NULL;    /* Leave the old */
  200 
  201         bus_dmamap_unload(uh->uh_dmat, ifr->ifrw_map);
  202         m = ifr->ifrw_mbuf;
  203         ifr->ifrw_mbuf = mn;
  204         if ((bus_dmamap_load(uh->uh_dmat, ifr->ifrw_map,
  205             mn->m_ext.ext_buf, mn->m_ext.ext_size, NULL, BUS_DMA_NOWAIT)))
  206                 panic("if_ubaget"); /* Cannot happen */
  207         m->m_pkthdr.rcvif = ifp;
  208         m->m_len = m->m_pkthdr.len = len;
  209         return m;
  210 }
  211 
  212 /*
  213  * Called after a packet is sent. Releases hold resources.
  214  */
  215 void
  216 if_ubaend(struct ifubinfo *ifu, struct ifxmt *ifw)
  217 {
  218         struct uba_softc *uh = ifu->iff_softc;
  219 
  220         if (ifw->ifw_flags & IFRW_MBUF) {
  221                 bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
  222                 m_freem(ifw->ifw_mbuf);
  223                 ifw->ifw_mbuf = NULL;
  224         }
  225 }
  226 
  227 /*
  228  * Map a chain of mbufs onto a network interface
  229  * in preparation for an i/o operation.
  230  * The argument chain of mbufs includes the local network
  231  * header which is copied to be in the mapped, aligned
  232  * i/o space.
  233  */
  234 int
  235 if_ubaput(struct ifubinfo *ifu, struct ifxmt *ifw, struct mbuf *m)
  236 {
  237         struct uba_softc *uh = ifu->iff_softc;
  238         int len;
  239 
  240         if (/* m->m_next ==*/ 0) {
  241                 /*
  242                  * Map the outgoing packet directly.
  243                  */
  244                 if ((ifw->ifw_flags & IFRW_MBUF) == 0) {
  245                         bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
  246                         ifw->ifw_flags |= IFRW_MBUF;
  247                 }
  248                 bus_dmamap_load(uh->uh_dmat, ifw->ifw_map, mtod(m, void *),
  249                     m->m_len, NULL, BUS_DMA_NOWAIT);
  250                 ifw->ifw_mbuf = m;
  251                 len = m->m_len;
  252         } else {
  253                 if (ifw->ifw_flags & IFRW_MBUF) {
  254                         bus_dmamap_load(uh->uh_dmat, ifw->ifw_map,
  255                             ifw->ifw_vaddr, ifw->ifw_size,NULL,BUS_DMA_NOWAIT);
  256                         ifw->ifw_flags &= ~IFRW_MBUF;
  257                 }
  258                 len = m->m_pkthdr.len;
  259                 m_copydata(m, 0, m->m_pkthdr.len, ifw->ifw_vaddr);
  260                 m_freem(m);
  261         }
  262         return len;
  263 }

Cache object: 707a83362ed344d8e628e7b75f569fd0

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FreeBSD/Linux Kernel Cross Reference sys/dev/qbus/if_uba.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/qbus/if_uba.c