if_uba.c

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    1 /*      $NetBSD: if_uba.c,v 1.32 2016/06/10 13:27:15 ozaki-r 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 1.32 2016/06/10 13:27:15 ozaki-r 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 <net/if.h>
   45 
   46 #include <sys/bus.h>
   47 
   48 #include <dev/qbus/if_uba.h>
   49 #include <dev/qbus/ubareg.h>
   50 #include <dev/qbus/ubavar.h>
   51 
   52 static  struct mbuf *getmcl(void);
   53 
   54 /*
   55  * Routines supporting UNIBUS network interfaces.
   56  *
   57  * TODO:
   58  *      Support interfaces using only one BDP statically.
   59  */
   60 
   61 /*
   62  * Init UNIBUS for interface whose headers of size hlen are to
   63  * end on a page boundary.  We allocate a UNIBUS map register for the page
   64  * with the header, and nmr more UNIBUS map registers for i/o on the adapter,
   65  * doing this once for each read and once for each write buffer.  We also
   66  * allocate page frames in the mbuffer pool for these pages.
   67  *
   68  * Recent changes:
   69  *      No special "header pages" anymore.
   70  *      Recv packets are always put in clusters.
   71  *      "size" is the maximum buffer size, may not be bigger than MCLBYTES.
   72  */
   73 int
   74 if_ubaminit(struct ifubinfo *ifu, struct uba_softc *uh, int size,
   75     struct ifrw *ifr, int nr, struct ifxmt *ifw, int nw)
   76 {
   77         struct mbuf *m;
   78         int totsz, i, error, rseg, nm = nr;
   79         bus_dma_segment_t seg;
   80         void *vaddr;
   81 
   82 #ifdef DIAGNOSTIC
   83         if (size > MCLBYTES)
   84                 panic("if_ubaminit: size > MCLBYTES");
   85 #endif
   86         ifu->iff_softc = uh;
   87         /*
   88          * Get DMA memory for transmit buffers.
   89          * Buffer size are rounded up to a multiple of the uba page size,
   90          * then allocated contiguous.
   91          */
   92         size = (size + UBA_PGOFSET) & ~UBA_PGOFSET;
   93         totsz = size * nw;
   94         if ((error = bus_dmamem_alloc(uh->uh_dmat, totsz, PAGE_SIZE, 0,
   95             &seg, 1, &rseg, BUS_DMA_NOWAIT)))
   96                 return error;
   97         if ((error = bus_dmamem_map(uh->uh_dmat, &seg, rseg, totsz, &vaddr,
   98             BUS_DMA_NOWAIT|BUS_DMA_COHERENT))) {
   99                 bus_dmamem_free(uh->uh_dmat, &seg, rseg);
  100                 return error;
  101         }
  102 
  103         /*
  104          * Create receive and transmit maps.
  105          * Alloc all resources now so we won't fail in the future.
  106          */
  107 
  108         for (i = 0; i < nr; i++) {
  109                 if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
  110                     size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
  111                     &ifr[i].ifrw_map))) {
  112                         nr = i;
  113                         nm = nw = 0;
  114                         goto bad;
  115                 }
  116         }
  117         for (i = 0; i < nw; i++) {
  118                 if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
  119                     size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
  120                     &ifw[i].ifw_map))) {
  121                         nw = i;
  122                         nm = 0;
  123                         goto bad;
  124                 }
  125         }
  126         /*
  127          * Preload the rx maps with mbuf clusters.
  128          */
  129         for (i = 0; i < nm; i++) {
  130                 if ((m = getmcl()) == NULL) {
  131                         nm = i;
  132                         goto bad;
  133                 }
  134                 ifr[i].ifrw_mbuf = m;
  135                 bus_dmamap_load(uh->uh_dmat, ifr[i].ifrw_map,
  136                     m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT);
  137 
  138         }
  139         /*
  140          * Load the tx maps with DMA memory (common case).
  141          */
  142         for (i = 0; i < nw; i++) {
  143                 ifw[i].ifw_vaddr = (char *)vaddr + size * i;
  144                 ifw[i].ifw_size = size;
  145                 bus_dmamap_load(uh->uh_dmat, ifw[i].ifw_map,
  146                     ifw[i].ifw_vaddr, ifw[i].ifw_size, NULL, BUS_DMA_NOWAIT);
  147         }
  148         return 0;
  149 bad:
  150         while (--nm >= 0) {
  151                 bus_dmamap_unload(uh->uh_dmat, ifr[nw].ifrw_map);
  152                 m_freem(ifr[nm].ifrw_mbuf);
  153         }
  154         while (--nw >= 0)
  155                 bus_dmamap_destroy(uh->uh_dmat, ifw[nw].ifw_map);
  156         while (--nr >= 0)
  157                 bus_dmamap_destroy(uh->uh_dmat, ifr[nw].ifrw_map);
  158         return (0);
  159 }
  160 
  161 struct mbuf *
  162 getmcl(void)
  163 {
  164         struct mbuf *m;
  165 
  166         MGETHDR(m, M_DONTWAIT, MT_DATA);
  167         if (m == NULL)
  168                 return 0;
  169         MCLGET(m, M_DONTWAIT);
  170         if ((m->m_flags & M_EXT) == 0) {
  171                 m_freem(m);
  172                 return 0;
  173         }
  174         return m;
  175 }
  176 
  177 /*
  178  * Pull read data off a interface.
  179  * Totlen is length of data, with local net header stripped.
  180  * When full cluster sized units are present
  181  * on the interface on cluster boundaries we can get them more
  182  * easily by remapping, and take advantage of this here.
  183  * Save a pointer to the interface structure and the total length,
  184  * so that protocols can determine where incoming packets arrived.
  185  * Note: we may be called to receive from a transmit buffer by some
  186  * devices.  In that case, we must force normal mapping of the buffer,
  187  * so that the correct data will appear (only unibus maps are
  188  * changed when remapping the transmit buffers).
  189  */
  190 struct mbuf *
  191 if_ubaget(struct ifubinfo *ifu, struct ifrw *ifr, struct ifnet *ifp, int len)
  192 {
  193         struct uba_softc *uh = ifu->iff_softc;
  194         struct mbuf *m, *mn;
  195 
  196         if ((mn = getmcl()) == NULL)
  197                 return NULL;    /* Leave the old */
  198 
  199         bus_dmamap_unload(uh->uh_dmat, ifr->ifrw_map);
  200         m = ifr->ifrw_mbuf;
  201         ifr->ifrw_mbuf = mn;
  202         if ((bus_dmamap_load(uh->uh_dmat, ifr->ifrw_map,
  203             mn->m_ext.ext_buf, mn->m_ext.ext_size, NULL, BUS_DMA_NOWAIT)))
  204                 panic("if_ubaget"); /* Cannot happen */
  205         m_set_rcvif(m, ifp);
  206         m->m_len = m->m_pkthdr.len = len;
  207         return m;
  208 }
  209 
  210 /*
  211  * Called after a packet is sent. Releases hold resources.
  212  */
  213 void
  214 if_ubaend(struct ifubinfo *ifu, struct ifxmt *ifw)
  215 {
  216         struct uba_softc *uh = ifu->iff_softc;
  217 
  218         if (ifw->ifw_flags & IFRW_MBUF) {
  219                 bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
  220                 m_freem(ifw->ifw_mbuf);
  221                 ifw->ifw_mbuf = NULL;
  222         }
  223 }
  224 
  225 /*
  226  * Map a chain of mbufs onto a network interface
  227  * in preparation for an i/o operation.
  228  * The argument chain of mbufs includes the local network
  229  * header which is copied to be in the mapped, aligned
  230  * i/o space.
  231  */
  232 int
  233 if_ubaput(struct ifubinfo *ifu, struct ifxmt *ifw, struct mbuf *m)
  234 {
  235         struct uba_softc *uh = ifu->iff_softc;
  236         int len;
  237 
  238         if (/* m->m_next ==*/ 0) {
  239                 /*
  240                  * Map the outgoing packet directly.
  241                  */
  242                 if ((ifw->ifw_flags & IFRW_MBUF) == 0) {
  243                         bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
  244                         ifw->ifw_flags |= IFRW_MBUF;
  245                 }
  246                 bus_dmamap_load(uh->uh_dmat, ifw->ifw_map, mtod(m, void *),
  247                     m->m_len, NULL, BUS_DMA_NOWAIT);
  248                 ifw->ifw_mbuf = m;
  249                 len = m->m_len;
  250         } else {
  251                 if (ifw->ifw_flags & IFRW_MBUF) {
  252                         bus_dmamap_load(uh->uh_dmat, ifw->ifw_map,
  253                             ifw->ifw_vaddr, ifw->ifw_size,NULL,BUS_DMA_NOWAIT);
  254                         ifw->ifw_flags &= ~IFRW_MBUF;
  255                 }
  256                 len = m->m_pkthdr.len;
  257                 m_copydata(m, 0, m->m_pkthdr.len, ifw->ifw_vaddr);
  258                 m_freem(m);
  259         }
  260         return len;
  261 }

Cache object: a948e1854919ff287ecf24e37000a400

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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