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if_uba.c revision 1.26.26.1
      1  1.26.26.1    rmind /*	$NetBSD: if_uba.c,v 1.26.26.1 2007/03/12 05:56:49 rmind Exp $	*/
      2        1.3      cgd 
      3        1.1    ragge /*
      4        1.1    ragge  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
      5        1.1    ragge  * All rights reserved.
      6        1.1    ragge  *
      7        1.1    ragge  * Redistribution and use in source and binary forms, with or without
      8        1.1    ragge  * modification, are permitted provided that the following conditions
      9        1.1    ragge  * are met:
     10        1.1    ragge  * 1. Redistributions of source code must retain the above copyright
     11        1.1    ragge  *    notice, this list of conditions and the following disclaimer.
     12        1.1    ragge  * 2. Redistributions in binary form must reproduce the above copyright
     13        1.1    ragge  *    notice, this list of conditions and the following disclaimer in the
     14        1.1    ragge  *    documentation and/or other materials provided with the distribution.
     15       1.24      agc  * 3. Neither the name of the University nor the names of its contributors
     16        1.1    ragge  *    may be used to endorse or promote products derived from this software
     17        1.1    ragge  *    without specific prior written permission.
     18        1.1    ragge  *
     19        1.1    ragge  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20        1.1    ragge  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21        1.1    ragge  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22        1.1    ragge  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23        1.1    ragge  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24        1.1    ragge  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25        1.1    ragge  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26        1.1    ragge  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27        1.1    ragge  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28        1.1    ragge  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29        1.1    ragge  * SUCH DAMAGE.
     30        1.1    ragge  *
     31        1.1    ragge  *	@(#)if_uba.c	7.16 (Berkeley) 12/16/90
     32        1.1    ragge  */
     33        1.1    ragge 
     34       1.22    lukem #include <sys/cdefs.h>
     35  1.26.26.1    rmind __KERNEL_RCSID(0, "$NetBSD: if_uba.c,v 1.26.26.1 2007/03/12 05:56:49 rmind Exp $");
     36       1.10    ragge 
     37        1.8  mycroft #include <sys/param.h>
     38        1.8  mycroft #include <sys/systm.h>
     39        1.8  mycroft #include <sys/malloc.h>
     40        1.8  mycroft #include <sys/mbuf.h>
     41        1.8  mycroft #include <sys/socket.h>
     42       1.19    ragge #include <sys/device.h>
     43        1.1    ragge 
     44       1.23  thorpej #include <uvm/uvm_extern.h>
     45       1.23  thorpej 
     46        1.8  mycroft #include <net/if.h>
     47        1.1    ragge 
     48       1.19    ragge #include <machine/bus.h>
     49       1.19    ragge 
     50       1.19    ragge #include <dev/qbus/if_uba.h>
     51       1.19    ragge #include <dev/qbus/ubareg.h>
     52       1.19    ragge #include <dev/qbus/ubavar.h>
     53       1.19    ragge 
     54       1.19    ragge static	struct mbuf *getmcl(void);
     55        1.1    ragge 
     56        1.1    ragge /*
     57        1.1    ragge  * Routines supporting UNIBUS network interfaces.
     58        1.1    ragge  *
     59        1.1    ragge  * TODO:
     60        1.1    ragge  *	Support interfaces using only one BDP statically.
     61        1.1    ragge  */
     62        1.1    ragge 
     63        1.1    ragge /*
     64       1.12    ragge  * Init UNIBUS for interface whose headers of size hlen are to
     65        1.1    ragge  * end on a page boundary.  We allocate a UNIBUS map register for the page
     66        1.1    ragge  * with the header, and nmr more UNIBUS map registers for i/o on the adapter,
     67        1.1    ragge  * doing this once for each read and once for each write buffer.  We also
     68        1.1    ragge  * allocate page frames in the mbuffer pool for these pages.
     69       1.19    ragge  *
     70       1.19    ragge  * Recent changes:
     71       1.19    ragge  *	No special "header pages" anymore.
     72       1.19    ragge  *	Recv packets are always put in clusters.
     73       1.19    ragge  *	"size" is the maximum buffer size, may not be bigger than MCLBYTES.
     74        1.1    ragge  */
     75       1.10    ragge int
     76       1.19    ragge if_ubaminit(struct ifubinfo *ifu, struct uba_softc *uh, int size,
     77       1.19    ragge     struct ifrw *ifr, int nr, struct ifxmt *ifw, int nw)
     78        1.1    ragge {
     79       1.19    ragge 	struct mbuf *m;
     80       1.19    ragge 	int totsz, i, error, rseg, nm = nr;
     81       1.19    ragge 	bus_dma_segment_t seg;
     82  1.26.26.1    rmind 	void *vaddr;
     83       1.19    ragge 
     84       1.19    ragge #ifdef DIAGNOSTIC
     85       1.19    ragge 	if (size > MCLBYTES)
     86       1.19    ragge 		panic("if_ubaminit: size > MCLBYTES");
     87       1.19    ragge #endif
     88       1.19    ragge 	ifu->iff_softc = uh;
     89       1.19    ragge 	/*
     90       1.19    ragge 	 * Get DMA memory for transmit buffers.
     91       1.19    ragge 	 * Buffer size are rounded up to a multiple of the uba page size,
     92       1.19    ragge 	 * then allocated contiguous.
     93       1.19    ragge 	 */
     94       1.19    ragge 	size = (size + UBA_PGOFSET) & ~UBA_PGOFSET;
     95       1.19    ragge 	totsz = size * nw;
     96       1.23  thorpej 	if ((error = bus_dmamem_alloc(uh->uh_dmat, totsz, PAGE_SIZE, 0,
     97       1.19    ragge 	    &seg, 1, &rseg, BUS_DMA_NOWAIT)))
     98       1.19    ragge 		return error;
     99       1.19    ragge 	if ((error = bus_dmamem_map(uh->uh_dmat, &seg, rseg, totsz, &vaddr,
    100       1.19    ragge 	    BUS_DMA_NOWAIT|BUS_DMA_COHERENT))) {
    101       1.19    ragge 		bus_dmamem_free(uh->uh_dmat, &seg, rseg);
    102       1.19    ragge 		return error;
    103        1.1    ragge 	}
    104       1.19    ragge 
    105       1.19    ragge 	/*
    106       1.19    ragge 	 * Create receive and transmit maps.
    107       1.19    ragge 	 * Alloc all resources now so we won't fail in the future.
    108       1.19    ragge 	 */
    109       1.19    ragge 
    110       1.19    ragge 	for (i = 0; i < nr; i++) {
    111       1.19    ragge 		if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
    112       1.19    ragge 		    size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
    113       1.19    ragge 		    &ifr[i].ifrw_map))) {
    114        1.1    ragge 			nr = i;
    115       1.19    ragge 			nm = nw = 0;
    116        1.1    ragge 			goto bad;
    117        1.1    ragge 		}
    118       1.19    ragge 	}
    119       1.19    ragge 	for (i = 0; i < nw; i++) {
    120       1.19    ragge 		if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
    121       1.19    ragge 		    size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
    122       1.19    ragge 		    &ifw[i].ifw_map))) {
    123        1.1    ragge 			nw = i;
    124       1.19    ragge 			nm = 0;
    125        1.1    ragge 			goto bad;
    126        1.1    ragge 		}
    127        1.1    ragge 	}
    128       1.19    ragge 	/*
    129       1.19    ragge 	 * Preload the rx maps with mbuf clusters.
    130       1.19    ragge 	 */
    131       1.19    ragge 	for (i = 0; i < nm; i++) {
    132       1.19    ragge 		if ((m = getmcl()) == NULL) {
    133       1.19    ragge 			nm = i;
    134       1.19    ragge 			goto bad;
    135       1.19    ragge 		}
    136       1.19    ragge 		ifr[i].ifrw_mbuf = m;
    137       1.19    ragge 		bus_dmamap_load(uh->uh_dmat, ifr[i].ifrw_map,
    138       1.19    ragge 		    m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT);
    139       1.25   simonb 
    140       1.19    ragge 	}
    141       1.19    ragge 	/*
    142       1.19    ragge 	 * Load the tx maps with DMA memory (common case).
    143       1.19    ragge 	 */
    144       1.19    ragge 	for (i = 0; i < nw; i++) {
    145  1.26.26.1    rmind 		ifw[i].ifw_vaddr = (char *)vaddr + size * i;
    146       1.19    ragge 		ifw[i].ifw_size = size;
    147       1.25   simonb 		bus_dmamap_load(uh->uh_dmat, ifw[i].ifw_map,
    148       1.19    ragge 		    ifw[i].ifw_vaddr, ifw[i].ifw_size, NULL, BUS_DMA_NOWAIT);
    149       1.19    ragge 	}
    150       1.19    ragge 	return 0;
    151        1.1    ragge bad:
    152       1.19    ragge 	while (--nm >= 0) {
    153       1.19    ragge 		bus_dmamap_unload(uh->uh_dmat, ifr[nw].ifrw_map);
    154       1.19    ragge 		m_freem(ifr[nm].ifrw_mbuf);
    155       1.19    ragge 	}
    156        1.1    ragge 	while (--nw >= 0)
    157       1.19    ragge 		bus_dmamap_destroy(uh->uh_dmat, ifw[nw].ifw_map);
    158        1.1    ragge 	while (--nr >= 0)
    159       1.19    ragge 		bus_dmamap_destroy(uh->uh_dmat, ifr[nw].ifrw_map);
    160        1.1    ragge 	return (0);
    161        1.1    ragge }
    162        1.1    ragge 
    163       1.19    ragge struct mbuf *
    164       1.19    ragge getmcl()
    165        1.1    ragge {
    166       1.19    ragge 	struct mbuf *m;
    167        1.1    ragge 
    168       1.19    ragge 	MGETHDR(m, M_DONTWAIT, MT_DATA);
    169       1.19    ragge 	if (m == NULL)
    170       1.19    ragge 		return 0;
    171       1.19    ragge 	MCLGET(m, M_DONTWAIT);
    172       1.19    ragge 	if ((m->m_flags & M_EXT) == 0) {
    173       1.19    ragge 		m_freem(m);
    174       1.19    ragge 		return 0;
    175       1.19    ragge 	}
    176       1.19    ragge 	return m;
    177        1.1    ragge }
    178        1.1    ragge 
    179        1.1    ragge /*
    180        1.1    ragge  * Pull read data off a interface.
    181        1.1    ragge  * Totlen is length of data, with local net header stripped.
    182        1.6  mycroft  * When full cluster sized units are present
    183        1.1    ragge  * on the interface on cluster boundaries we can get them more
    184        1.1    ragge  * easily by remapping, and take advantage of this here.
    185        1.1    ragge  * Save a pointer to the interface structure and the total length,
    186        1.1    ragge  * so that protocols can determine where incoming packets arrived.
    187        1.1    ragge  * Note: we may be called to receive from a transmit buffer by some
    188        1.1    ragge  * devices.  In that case, we must force normal mapping of the buffer,
    189       1.25   simonb  * so that the correct data will appear (only unibus maps are
    190        1.1    ragge  * changed when remapping the transmit buffers).
    191        1.1    ragge  */
    192        1.1    ragge struct mbuf *
    193       1.19    ragge if_ubaget(struct ifubinfo *ifu, struct ifrw *ifr, struct ifnet *ifp, int len)
    194        1.1    ragge {
    195       1.19    ragge 	struct uba_softc *uh = ifu->iff_softc;
    196       1.19    ragge 	struct mbuf *m, *mn;
    197        1.1    ragge 
    198       1.19    ragge 	if ((mn = getmcl()) == NULL)
    199       1.19    ragge 		return NULL;	/* Leave the old */
    200        1.1    ragge 
    201       1.19    ragge 	bus_dmamap_unload(uh->uh_dmat, ifr->ifrw_map);
    202       1.19    ragge 	m = ifr->ifrw_mbuf;
    203       1.19    ragge 	ifr->ifrw_mbuf = mn;
    204       1.19    ragge 	if ((bus_dmamap_load(uh->uh_dmat, ifr->ifrw_map,
    205       1.19    ragge 	    mn->m_ext.ext_buf, mn->m_ext.ext_size, NULL, BUS_DMA_NOWAIT)))
    206       1.19    ragge 		panic("if_ubaget"); /* Cannot happen */
    207       1.19    ragge 	m->m_pkthdr.rcvif = ifp;
    208       1.19    ragge 	m->m_len = m->m_pkthdr.len = len;
    209       1.19    ragge 	return m;
    210        1.1    ragge }
    211        1.1    ragge 
    212        1.1    ragge /*
    213       1.19    ragge  * Called after a packet is sent. Releases hold resources.
    214        1.1    ragge  */
    215       1.19    ragge void
    216       1.19    ragge if_ubaend(struct ifubinfo *ifu, struct ifxmt *ifw)
    217        1.1    ragge {
    218       1.19    ragge 	struct uba_softc *uh = ifu->iff_softc;
    219        1.1    ragge 
    220       1.19    ragge 	if (ifw->ifw_flags & IFRW_MBUF) {
    221       1.19    ragge 		bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
    222       1.19    ragge 		m_freem(ifw->ifw_mbuf);
    223       1.19    ragge 		ifw->ifw_mbuf = NULL;
    224       1.19    ragge 	}
    225        1.1    ragge }
    226        1.1    ragge 
    227        1.1    ragge /*
    228        1.1    ragge  * Map a chain of mbufs onto a network interface
    229        1.1    ragge  * in preparation for an i/o operation.
    230        1.1    ragge  * The argument chain of mbufs includes the local network
    231        1.1    ragge  * header which is copied to be in the mapped, aligned
    232        1.1    ragge  * i/o space.
    233        1.1    ragge  */
    234       1.10    ragge int
    235       1.19    ragge if_ubaput(struct ifubinfo *ifu, struct ifxmt *ifw, struct mbuf *m)
    236        1.1    ragge {
    237       1.19    ragge 	struct uba_softc *uh = ifu->iff_softc;
    238       1.19    ragge 	int len;
    239        1.1    ragge 
    240       1.19    ragge 	if (/* m->m_next ==*/ 0) {
    241       1.19    ragge 		/*
    242       1.19    ragge 		 * Map the outgoing packet directly.
    243       1.19    ragge 		 */
    244       1.19    ragge 		if ((ifw->ifw_flags & IFRW_MBUF) == 0) {
    245       1.19    ragge 			bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
    246       1.19    ragge 			ifw->ifw_flags |= IFRW_MBUF;
    247       1.19    ragge 		}
    248       1.19    ragge 		bus_dmamap_load(uh->uh_dmat, ifw->ifw_map, mtod(m, void *),
    249       1.19    ragge 		    m->m_len, NULL, BUS_DMA_NOWAIT);
    250       1.19    ragge 		ifw->ifw_mbuf = m;
    251       1.19    ragge 		len = m->m_len;
    252       1.19    ragge 	} else {
    253       1.19    ragge 		if (ifw->ifw_flags & IFRW_MBUF) {
    254       1.19    ragge 			bus_dmamap_load(uh->uh_dmat, ifw->ifw_map,
    255       1.25   simonb 			    ifw->ifw_vaddr, ifw->ifw_size,NULL,BUS_DMA_NOWAIT);
    256       1.19    ragge 			ifw->ifw_flags &= ~IFRW_MBUF;
    257       1.19    ragge 		}
    258       1.19    ragge 		len = m->m_pkthdr.len;
    259       1.19    ragge 		m_copydata(m, 0, m->m_pkthdr.len, ifw->ifw_vaddr);
    260       1.19    ragge 		m_freem(m);
    261        1.1    ragge 	}
    262       1.19    ragge 	return len;
    263        1.1    ragge }
    264