NetBSD-5.0.2/sys/dev/qbus/if_uba.c
/* $NetBSD: if_uba.c,v 1.30 2008/03/11 05:34:01 matt Exp $ */
/*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if_uba.c 7.16 (Berkeley) 12/16/90
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_uba.c,v 1.30 2008/03/11 05:34:01 matt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#include <net/if.h>
#include <sys/bus.h>
#include <dev/qbus/if_uba.h>
#include <dev/qbus/ubareg.h>
#include <dev/qbus/ubavar.h>
static struct mbuf *getmcl(void);
/*
* Routines supporting UNIBUS network interfaces.
*
* TODO:
* Support interfaces using only one BDP statically.
*/
/*
* Init UNIBUS for interface whose headers of size hlen are to
* end on a page boundary. We allocate a UNIBUS map register for the page
* with the header, and nmr more UNIBUS map registers for i/o on the adapter,
* doing this once for each read and once for each write buffer. We also
* allocate page frames in the mbuffer pool for these pages.
*
* Recent changes:
* No special "header pages" anymore.
* Recv packets are always put in clusters.
* "size" is the maximum buffer size, may not be bigger than MCLBYTES.
*/
int
if_ubaminit(struct ifubinfo *ifu, struct uba_softc *uh, int size,
struct ifrw *ifr, int nr, struct ifxmt *ifw, int nw)
{
struct mbuf *m;
int totsz, i, error, rseg, nm = nr;
bus_dma_segment_t seg;
void *vaddr;
#ifdef DIAGNOSTIC
if (size > MCLBYTES)
panic("if_ubaminit: size > MCLBYTES");
#endif
ifu->iff_softc = uh;
/*
* Get DMA memory for transmit buffers.
* Buffer size are rounded up to a multiple of the uba page size,
* then allocated contiguous.
*/
size = (size + UBA_PGOFSET) & ~UBA_PGOFSET;
totsz = size * nw;
if ((error = bus_dmamem_alloc(uh->uh_dmat, totsz, PAGE_SIZE, 0,
&seg, 1, &rseg, BUS_DMA_NOWAIT)))
return error;
if ((error = bus_dmamem_map(uh->uh_dmat, &seg, rseg, totsz, &vaddr,
BUS_DMA_NOWAIT|BUS_DMA_COHERENT))) {
bus_dmamem_free(uh->uh_dmat, &seg, rseg);
return error;
}
/*
* Create receive and transmit maps.
* Alloc all resources now so we won't fail in the future.
*/
for (i = 0; i < nr; i++) {
if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
&ifr[i].ifrw_map))) {
nr = i;
nm = nw = 0;
goto bad;
}
}
for (i = 0; i < nw; i++) {
if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
&ifw[i].ifw_map))) {
nw = i;
nm = 0;
goto bad;
}
}
/*
* Preload the rx maps with mbuf clusters.
*/
for (i = 0; i < nm; i++) {
if ((m = getmcl()) == NULL) {
nm = i;
goto bad;
}
ifr[i].ifrw_mbuf = m;
bus_dmamap_load(uh->uh_dmat, ifr[i].ifrw_map,
m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT);
}
/*
* Load the tx maps with DMA memory (common case).
*/
for (i = 0; i < nw; i++) {
ifw[i].ifw_vaddr = (char *)vaddr + size * i;
ifw[i].ifw_size = size;
bus_dmamap_load(uh->uh_dmat, ifw[i].ifw_map,
ifw[i].ifw_vaddr, ifw[i].ifw_size, NULL, BUS_DMA_NOWAIT);
}
return 0;
bad:
while (--nm >= 0) {
bus_dmamap_unload(uh->uh_dmat, ifr[nw].ifrw_map);
m_freem(ifr[nm].ifrw_mbuf);
}
while (--nw >= 0)
bus_dmamap_destroy(uh->uh_dmat, ifw[nw].ifw_map);
while (--nr >= 0)
bus_dmamap_destroy(uh->uh_dmat, ifr[nw].ifrw_map);
return (0);
}
struct mbuf *
getmcl(void)
{
struct mbuf *m;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return 0;
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_freem(m);
return 0;
}
return m;
}
/*
* Pull read data off a interface.
* Totlen is length of data, with local net header stripped.
* When full cluster sized units are present
* on the interface on cluster boundaries we can get them more
* easily by remapping, and take advantage of this here.
* Save a pointer to the interface structure and the total length,
* so that protocols can determine where incoming packets arrived.
* Note: we may be called to receive from a transmit buffer by some
* devices. In that case, we must force normal mapping of the buffer,
* so that the correct data will appear (only unibus maps are
* changed when remapping the transmit buffers).
*/
struct mbuf *
if_ubaget(struct ifubinfo *ifu, struct ifrw *ifr, struct ifnet *ifp, int len)
{
struct uba_softc *uh = ifu->iff_softc;
struct mbuf *m, *mn;
if ((mn = getmcl()) == NULL)
return NULL; /* Leave the old */
bus_dmamap_unload(uh->uh_dmat, ifr->ifrw_map);
m = ifr->ifrw_mbuf;
ifr->ifrw_mbuf = mn;
if ((bus_dmamap_load(uh->uh_dmat, ifr->ifrw_map,
mn->m_ext.ext_buf, mn->m_ext.ext_size, NULL, BUS_DMA_NOWAIT)))
panic("if_ubaget"); /* Cannot happen */
m->m_pkthdr.rcvif = ifp;
m->m_len = m->m_pkthdr.len = len;
return m;
}
/*
* Called after a packet is sent. Releases hold resources.
*/
void
if_ubaend(struct ifubinfo *ifu, struct ifxmt *ifw)
{
struct uba_softc *uh = ifu->iff_softc;
if (ifw->ifw_flags & IFRW_MBUF) {
bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
m_freem(ifw->ifw_mbuf);
ifw->ifw_mbuf = NULL;
}
}
/*
* Map a chain of mbufs onto a network interface
* in preparation for an i/o operation.
* The argument chain of mbufs includes the local network
* header which is copied to be in the mapped, aligned
* i/o space.
*/
int
if_ubaput(struct ifubinfo *ifu, struct ifxmt *ifw, struct mbuf *m)
{
struct uba_softc *uh = ifu->iff_softc;
int len;
if (/* m->m_next ==*/ 0) {
/*
* Map the outgoing packet directly.
*/
if ((ifw->ifw_flags & IFRW_MBUF) == 0) {
bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
ifw->ifw_flags |= IFRW_MBUF;
}
bus_dmamap_load(uh->uh_dmat, ifw->ifw_map, mtod(m, void *),
m->m_len, NULL, BUS_DMA_NOWAIT);
ifw->ifw_mbuf = m;
len = m->m_len;
} else {
if (ifw->ifw_flags & IFRW_MBUF) {
bus_dmamap_load(uh->uh_dmat, ifw->ifw_map,
ifw->ifw_vaddr, ifw->ifw_size,NULL,BUS_DMA_NOWAIT);
ifw->ifw_flags &= ~IFRW_MBUF;
}
len = m->m_pkthdr.len;
m_copydata(m, 0, m->m_pkthdr.len, ifw->ifw_vaddr);
m_freem(m);
}
return len;
}