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freebsd-dev/sys/dev/hatm/if_hatm_intr.c

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/*-
* Copyright (c) 2001-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
* Author: Hartmut Brandt <harti@freebsd.org>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* ForeHE driver.
*
* Interrupt handler.
*/
#include "opt_inet.h"
#include "opt_natm.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/errno.h>
#include <sys/conf.h>
#include <sys/module.h>
#include <sys/queue.h>
#include <sys/syslog.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <vm/uma.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/if_atm.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_atm.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/utopia/utopia.h>
#include <dev/hatm/if_hatmconf.h>
#include <dev/hatm/if_hatmreg.h>
#include <dev/hatm/if_hatmvar.h>
CTASSERT(sizeof(struct mbuf_page) == MBUF_ALLOC_SIZE);
CTASSERT(sizeof(struct mbuf0_chunk) == MBUF0_CHUNK);
CTASSERT(sizeof(struct mbuf1_chunk) == MBUF1_CHUNK);
CTASSERT(sizeof(((struct mbuf0_chunk *)NULL)->storage) >= MBUF0_SIZE);
CTASSERT(sizeof(((struct mbuf1_chunk *)NULL)->storage) >= MBUF1_SIZE);
CTASSERT(sizeof(struct tpd) <= HE_TPD_SIZE);
CTASSERT(MBUF0_PER_PAGE <= 256);
CTASSERT(MBUF1_PER_PAGE <= 256);
static void hatm_mbuf_page_alloc(struct hatm_softc *sc, u_int group);
/*
* Free an external mbuf to a list. We use atomic functions so that
* we don't need a mutex for the list.
*
* Note that in general this algorithm is not safe when multiple readers
* and writers are present. To cite from a mail from David Schultz
* <das@freebsd.org>:
*
* It looks like this is subject to the ABA problem. For instance,
* suppose X, Y, and Z are the top things on the freelist and a
* thread attempts to make an allocation. You set buf to X and load
* buf->link (Y) into a register. Then the thread get preempted, and
* another thread allocates both X and Y, then frees X. When the
* original thread gets the CPU again, X is still on top of the
* freelist, so the atomic operation succeeds. However, the atomic
* op places Y on top of the freelist, even though Y is no longer
* free.
*
* We are, however sure that we have only one thread that ever allocates
* buffers because the only place we're call from is the interrupt handler.
* Under these circumstances the code looks safe.
*/
__inline void
hatm_ext_free(struct mbufx_free **list, struct mbufx_free *buf)
{
for (;;) {
buf->link = *list;
if (atomic_cmpset_ptr(list, buf->link, buf))
break;
}
}
static __inline struct mbufx_free *
hatm_ext_alloc(struct hatm_softc *sc, u_int g)
{
struct mbufx_free *buf;
for (;;) {
if ((buf = sc->mbuf_list[g]) == NULL)
break;
if (atomic_cmpset_ptr(&sc->mbuf_list[g], buf, buf->link))
break;
}
if (buf == NULL) {
hatm_mbuf_page_alloc(sc, g);
for (;;) {
if ((buf = sc->mbuf_list[g]) == NULL)
break;
if (atomic_cmpset_ptr(&sc->mbuf_list[g], buf, buf->link))
break;
}
}
return (buf);
}
/*
* Either the queue treshold was crossed or a TPD with the INTR bit set
* was transmitted.
*/
static void
he_intr_tbrq(struct hatm_softc *sc, struct hetbrq *q, u_int group)
{
uint32_t *tailp = &sc->hsp->group[group].tbrq_tail;
u_int no;
while (q->head != (*tailp >> 2)) {
no = (q->tbrq[q->head].addr & HE_REGM_TBRQ_ADDR) >>
HE_REGS_TPD_ADDR;
hatm_tx_complete(sc, TPD_ADDR(sc, no),
(q->tbrq[q->head].addr & HE_REGM_TBRQ_FLAGS));
if (++q->head == q->size)
q->head = 0;
}
WRITE4(sc, HE_REGO_TBRQ_H(group), q->head << 2);
}
/*
* DMA loader function for external mbuf page.
*/
static void
hatm_extbuf_helper(void *arg, bus_dma_segment_t *segs, int nsegs,
int error)
{
if (error) {
printf("%s: mapping error %d\n", __func__, error);
return;
}
KASSERT(nsegs == 1,
("too many segments for DMA: %d", nsegs));
KASSERT(segs[0].ds_addr <= 0xffffffffLU,
("phys addr too large %lx", (u_long)segs[0].ds_addr));
*(uint32_t *)arg = segs[0].ds_addr;
}
/*
* Allocate a page of external mbuf storage for the small pools.
* Create a DMA map and load it. Put all the chunks onto the right
* free list.
*/
static void
hatm_mbuf_page_alloc(struct hatm_softc *sc, u_int group)
{
struct mbuf_page *pg;
int err;
u_int i;
if (sc->mbuf_npages == sc->mbuf_max_pages)
return;
if ((pg = malloc(MBUF_ALLOC_SIZE, M_DEVBUF, M_NOWAIT)) == NULL)
return;
err = bus_dmamap_create(sc->mbuf_tag, 0, &pg->hdr.map);
if (err != 0) {
if_printf(&sc->ifatm.ifnet, "%s -- bus_dmamap_create: %d\n",
__func__, err);
free(pg, M_DEVBUF);
return;
}
err = bus_dmamap_load(sc->mbuf_tag, pg->hdr.map, pg, MBUF_ALLOC_SIZE,
hatm_extbuf_helper, &pg->hdr.phys, BUS_DMA_NOWAIT);
if (err != 0) {
if_printf(&sc->ifatm.ifnet, "%s -- mbuf mapping failed %d\n",
__func__, err);
bus_dmamap_destroy(sc->mbuf_tag, pg->hdr.map);
free(pg, M_DEVBUF);
return;
}
sc->mbuf_pages[sc->mbuf_npages] = pg;
if (group == 0) {
struct mbuf0_chunk *c;
pg->hdr.pool = 0;
pg->hdr.nchunks = MBUF0_PER_PAGE;
pg->hdr.chunksize = MBUF0_CHUNK;
pg->hdr.hdroff = sizeof(c->storage);
c = (struct mbuf0_chunk *)pg;
for (i = 0; i < MBUF0_PER_PAGE; i++, c++) {
c->hdr.pageno = sc->mbuf_npages;
c->hdr.chunkno = i;
c->hdr.flags = 0;
hatm_ext_free(&sc->mbuf_list[0],
(struct mbufx_free *)c);
}
} else {
struct mbuf1_chunk *c;
pg->hdr.pool = 1;
pg->hdr.nchunks = MBUF1_PER_PAGE;
pg->hdr.chunksize = MBUF1_CHUNK;
pg->hdr.hdroff = sizeof(c->storage);
c = (struct mbuf1_chunk *)pg;
for (i = 0; i < MBUF1_PER_PAGE; i++, c++) {
c->hdr.pageno = sc->mbuf_npages;
c->hdr.chunkno = i;
c->hdr.flags = 0;
hatm_ext_free(&sc->mbuf_list[1],
(struct mbufx_free *)c);
}
}
sc->mbuf_npages++;
}
/*
* Free an mbuf and put it onto the free list.
*/
static void
hatm_mbuf0_free(void *buf, void *args)
{
struct hatm_softc *sc = args;
struct mbuf0_chunk *c = buf;
KASSERT((c->hdr.flags & (MBUF_USED | MBUF_CARD)) == MBUF_USED,
("freeing unused mbuf %x", c->hdr.flags));
c->hdr.flags &= ~MBUF_USED;
hatm_ext_free(&sc->mbuf_list[0], (struct mbufx_free *)c);
}
static void
hatm_mbuf1_free(void *buf, void *args)
{
struct hatm_softc *sc = args;
struct mbuf1_chunk *c = buf;
KASSERT((c->hdr.flags & (MBUF_USED | MBUF_CARD)) == MBUF_USED,
("freeing unused mbuf %x", c->hdr.flags));
c->hdr.flags &= ~MBUF_USED;
hatm_ext_free(&sc->mbuf_list[1], (struct mbufx_free *)c);
}
static void
hatm_mbuf_helper(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
uint32_t *ptr = (uint32_t *)arg;
if (nsegs == 0) {
printf("%s: error=%d\n", __func__, error);
return;
}
KASSERT(nsegs == 1, ("too many segments for mbuf: %d", nsegs));
KASSERT(segs[0].ds_addr <= 0xffffffffLU,
("phys addr too large %lx", (u_long)segs[0].ds_addr));
*ptr = segs[0].ds_addr;
}
/*
* Receive buffer pool interrupt. This means the number of entries in the
* queue has dropped below the threshold. Try to supply new buffers.
*/
static void
he_intr_rbp(struct hatm_softc *sc, struct herbp *rbp, u_int large,
u_int group)
{
u_int ntail;
struct mbuf *m;
int error;
struct mbufx_free *cf;
struct mbuf_page *pg;
struct mbuf0_chunk *buf0;
struct mbuf1_chunk *buf1;
DBG(sc, INTR, ("%s buffer supply threshold crossed for group %u",
large ? "large" : "small", group));
rbp->head = (READ4(sc, HE_REGO_RBP_S(large, group)) >> HE_REGS_RBP_HEAD)
& (rbp->size - 1);
for (;;) {
if ((ntail = rbp->tail + 1) == rbp->size)
ntail = 0;
if (ntail == rbp->head)
break;
m = NULL;
if (large) {
/* allocate the MBUF */
if ((m = m_getcl(M_DONTWAIT, MT_DATA,
M_PKTHDR)) == NULL) {
if_printf(&sc->ifatm.ifnet,
"no mbuf clusters\n");
break;
}
m->m_data += MBUFL_OFFSET;
if (sc->lbufs[sc->lbufs_next] != NULL)
panic("hatm: lbufs full %u", sc->lbufs_next);
sc->lbufs[sc->lbufs_next] = m;
if ((error = bus_dmamap_load(sc->mbuf_tag,
sc->rmaps[sc->lbufs_next],
m->m_data, rbp->bsize, hatm_mbuf_helper,
&rbp->rbp[rbp->tail].phys, BUS_DMA_NOWAIT)) != 0)
panic("hatm: mbuf mapping failed %d", error);
bus_dmamap_sync(sc->mbuf_tag,
sc->rmaps[sc->lbufs_next],
BUS_DMASYNC_PREREAD);
rbp->rbp[rbp->tail].handle =
MBUF_MAKE_LHANDLE(sc->lbufs_next);
if (++sc->lbufs_next == sc->lbufs_size)
sc->lbufs_next = 0;
} else if (group == 0) {
/*
* Allocate small buffer in group 0
*/
if ((cf = hatm_ext_alloc(sc, 0)) == NULL)
break;
buf0 = (struct mbuf0_chunk *)cf;
pg = sc->mbuf_pages[buf0->hdr.pageno];
buf0->hdr.flags |= MBUF_CARD;
rbp->rbp[rbp->tail].phys = pg->hdr.phys +
buf0->hdr.chunkno * MBUF0_CHUNK + MBUF0_OFFSET;
rbp->rbp[rbp->tail].handle =
MBUF_MAKE_HANDLE(buf0->hdr.pageno,
buf0->hdr.chunkno);
bus_dmamap_sync(sc->mbuf_tag, pg->hdr.map,
BUS_DMASYNC_PREREAD);
} else if (group == 1) {
/*
* Allocate small buffer in group 1
*/
if ((cf = hatm_ext_alloc(sc, 1)) == NULL)
break;
buf1 = (struct mbuf1_chunk *)cf;
pg = sc->mbuf_pages[buf1->hdr.pageno];
buf1->hdr.flags |= MBUF_CARD;
rbp->rbp[rbp->tail].phys = pg->hdr.phys +
buf1->hdr.chunkno * MBUF1_CHUNK + MBUF1_OFFSET;
rbp->rbp[rbp->tail].handle =
MBUF_MAKE_HANDLE(buf1->hdr.pageno,
buf1->hdr.chunkno);
bus_dmamap_sync(sc->mbuf_tag, pg->hdr.map,
BUS_DMASYNC_PREREAD);
} else
/* ups */
break;
DBG(sc, DMA, ("MBUF loaded: handle=%x m=%p phys=%x",
rbp->rbp[rbp->tail].handle, m, rbp->rbp[rbp->tail].phys));
rbp->tail = ntail;
}
WRITE4(sc, HE_REGO_RBP_T(large, group),
(rbp->tail << HE_REGS_RBP_TAIL));
}
/*
* Extract the buffer and hand it to the receive routine
*/
static struct mbuf *
hatm_rx_buffer(struct hatm_softc *sc, u_int group, u_int handle)
{
u_int pageno;
u_int chunkno;
struct mbuf *m;
if (handle & MBUF_LARGE_FLAG) {
/* large buffer - sync and unload */
MBUF_PARSE_LHANDLE(handle, handle);
DBG(sc, RX, ("RX large handle=%x", handle));
bus_dmamap_sync(sc->mbuf_tag, sc->rmaps[handle],
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->mbuf_tag, sc->rmaps[handle]);
m = sc->lbufs[handle];
sc->lbufs[handle] = NULL;
return (m);
}
MBUF_PARSE_HANDLE(handle, pageno, chunkno);
DBG(sc, RX, ("RX group=%u handle=%x page=%u chunk=%u", group, handle,
pageno, chunkno));
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (group == 0) {
struct mbuf0_chunk *c0;
c0 = (struct mbuf0_chunk *)sc->mbuf_pages[pageno] + chunkno;
KASSERT(c0->hdr.pageno == pageno, ("pageno = %u/%u",
c0->hdr.pageno, pageno));
KASSERT(c0->hdr.chunkno == chunkno, ("chunkno = %u/%u",
c0->hdr.chunkno, chunkno));
KASSERT(c0->hdr.flags & MBUF_CARD, ("mbuf not on card %u/%u",
pageno, chunkno));
KASSERT(!(c0->hdr.flags & MBUF_USED), ("used mbuf %u/%u",
pageno, chunkno));
c0->hdr.flags |= MBUF_USED;
c0->hdr.flags &= ~MBUF_CARD;
if (m != NULL) {
m->m_ext.ref_cnt = &c0->hdr.ref_cnt;
m_extadd(m, (void *)c0, MBUF0_SIZE,
hatm_mbuf0_free, sc, M_PKTHDR, EXT_EXTREF);
m->m_data += MBUF0_OFFSET;
} else
hatm_mbuf0_free(c0, sc);
} else {
struct mbuf1_chunk *c1;
c1 = (struct mbuf1_chunk *)sc->mbuf_pages[pageno] + chunkno;
KASSERT(c1->hdr.pageno == pageno, ("pageno = %u/%u",
c1->hdr.pageno, pageno));
KASSERT(c1->hdr.chunkno == chunkno, ("chunkno = %u/%u",
c1->hdr.chunkno, chunkno));
KASSERT(c1->hdr.flags & MBUF_CARD, ("mbuf not on card %u/%u",
pageno, chunkno));
KASSERT(!(c1->hdr.flags & MBUF_USED), ("used mbuf %u/%u",
pageno, chunkno));
c1->hdr.flags |= MBUF_USED;
c1->hdr.flags &= ~MBUF_CARD;
if (m != NULL) {
m->m_ext.ref_cnt = &c1->hdr.ref_cnt;
m_extadd(m, (void *)c1, MBUF1_SIZE,
hatm_mbuf1_free, sc, M_PKTHDR, EXT_EXTREF);
m->m_data += MBUF1_OFFSET;
} else
hatm_mbuf1_free(c1, sc);
}
return (m);
}
/*
* Interrupt because of receive buffer returned.
*/
static void
he_intr_rbrq(struct hatm_softc *sc, struct herbrq *rq, u_int group)
{
struct he_rbrqen *e;
uint32_t flags, tail;
u_int cid, len;
struct mbuf *m;
for (;;) {
tail = sc->hsp->group[group].rbrq_tail >> 3;
if (rq->head == tail)
break;
e = &rq->rbrq[rq->head];
flags = e->addr & HE_REGM_RBRQ_FLAGS;
if (!(flags & HE_REGM_RBRQ_HBUF_ERROR))
m = hatm_rx_buffer(sc, group, e->addr);
else
m = NULL;
cid = (e->len & HE_REGM_RBRQ_CID) >> HE_REGS_RBRQ_CID;
len = 4 * (e->len & HE_REGM_RBRQ_LEN);
hatm_rx(sc, cid, flags, m, len);
if (++rq->head == rq->size)
rq->head = 0;
}
WRITE4(sc, HE_REGO_RBRQ_H(group), rq->head << 3);
}
void
hatm_intr(void *p)
{
struct heirq *q = p;
struct hatm_softc *sc = q->sc;
u_int status;
u_int tail;
/* if we have a stray interrupt with a non-initialized card,
* we cannot even lock before looking at the flag */
if (!(sc->ifatm.ifnet.if_flags & IFF_RUNNING))
return;
mtx_lock(&sc->mtx);
(void)READ4(sc, HE_REGO_INT_FIFO);
tail = *q->tailp;
if (q->head == tail) {
/* workaround for tail pointer not updated bug (8.1.1) */
DBG(sc, INTR, ("hatm: intr tailq not updated bug triggered"));
/* read the tail pointer from the card */
tail = READ4(sc, HE_REGO_IRQ_BASE(q->group)) &
HE_REGM_IRQ_BASE_TAIL;
BARRIER_R(sc);
sc->istats.bug_no_irq_upd++;
}
/* clear the interrupt */
WRITE4(sc, HE_REGO_INT_FIFO, HE_REGM_INT_FIFO_CLRA);
BARRIER_W(sc);
while (q->head != tail) {
status = q->irq[q->head];
q->irq[q->head] = HE_REGM_ITYPE_INVALID;
if (++q->head == (q->size - 1))
q->head = 0;
switch (status & HE_REGM_ITYPE) {
case HE_REGM_ITYPE_TBRQ:
DBG(sc, INTR, ("TBRQ treshold %u", status & HE_REGM_IGROUP));
sc->istats.itype_tbrq++;
he_intr_tbrq(sc, &sc->tbrq, status & HE_REGM_IGROUP);
break;
case HE_REGM_ITYPE_TPD:
DBG(sc, INTR, ("TPD ready %u", status & HE_REGM_IGROUP));
sc->istats.itype_tpd++;
he_intr_tbrq(sc, &sc->tbrq, status & HE_REGM_IGROUP);
break;
case HE_REGM_ITYPE_RBPS:
sc->istats.itype_rbps++;
switch (status & HE_REGM_IGROUP) {
case 0:
he_intr_rbp(sc, &sc->rbp_s0, 0, 0);
break;
case 1:
he_intr_rbp(sc, &sc->rbp_s1, 0, 1);
break;
default:
if_printf(&sc->ifatm.ifnet, "bad INTR RBPS%u\n",
status & HE_REGM_IGROUP);
break;
}
break;
case HE_REGM_ITYPE_RBPL:
sc->istats.itype_rbpl++;
switch (status & HE_REGM_IGROUP) {
case 0:
he_intr_rbp(sc, &sc->rbp_l0, 1, 0);
break;
default:
if_printf(&sc->ifatm.ifnet, "bad INTR RBPL%u\n",
status & HE_REGM_IGROUP);
break;
}
break;
case HE_REGM_ITYPE_RBRQ:
DBG(sc, INTR, ("INTERRUPT RBRQ %u", status & HE_REGM_IGROUP));
sc->istats.itype_rbrq++;
switch (status & HE_REGM_IGROUP) {
case 0:
he_intr_rbrq(sc, &sc->rbrq_0, 0);
break;
case 1:
if (sc->rbrq_1.size > 0) {
he_intr_rbrq(sc, &sc->rbrq_1, 1);
break;
}
/* FALLTHRU */
default:
if_printf(&sc->ifatm.ifnet, "bad INTR RBRQ%u\n",
status & HE_REGM_IGROUP);
break;
}
break;
case HE_REGM_ITYPE_RBRQT:
DBG(sc, INTR, ("INTERRUPT RBRQT %u", status & HE_REGM_IGROUP));
sc->istats.itype_rbrqt++;
switch (status & HE_REGM_IGROUP) {
case 0:
he_intr_rbrq(sc, &sc->rbrq_0, 0);
break;
case 1:
if (sc->rbrq_1.size > 0) {
he_intr_rbrq(sc, &sc->rbrq_1, 1);
break;
}
/* FALLTHRU */
default:
if_printf(&sc->ifatm.ifnet, "bad INTR RBRQT%u\n",
status & HE_REGM_IGROUP);
break;
}
break;
case HE_REGM_ITYPE_PHYS:
sc->istats.itype_phys++;
utopia_intr(&sc->utopia);
break;
#if HE_REGM_ITYPE_UNKNOWN != HE_REGM_ITYPE_INVALID
case HE_REGM_ITYPE_UNKNOWN:
sc->istats.itype_unknown++;
if_printf(&sc->ifatm.ifnet, "bad interrupt\n");
break;
#endif
case HE_REGM_ITYPE_ERR:
sc->istats.itype_err++;
switch (status) {
case HE_REGM_ITYPE_PERR:
if_printf(&sc->ifatm.ifnet, "parity error\n");
break;
case HE_REGM_ITYPE_ABORT:
if_printf(&sc->ifatm.ifnet, "abort interrupt "
"addr=0x%08x\n",
READ4(sc, HE_REGO_ABORT_ADDR));
break;
default:
if_printf(&sc->ifatm.ifnet,
"bad interrupt type %08x\n", status);
break;
}
break;
case HE_REGM_ITYPE_INVALID:
/* this is the documented fix for the ISW bug 8.1.1
* Note, that the documented fix is partly wrong:
* the ISWs should be intialized to 0xf8 not 0xff */
sc->istats.bug_bad_isw++;
DBG(sc, INTR, ("hatm: invalid ISW bug triggered"));
he_intr_tbrq(sc, &sc->tbrq, 0);
he_intr_rbp(sc, &sc->rbp_s0, 0, 0);
he_intr_rbp(sc, &sc->rbp_l0, 1, 0);
he_intr_rbp(sc, &sc->rbp_s1, 0, 1);
he_intr_rbrq(sc, &sc->rbrq_0, 0);
he_intr_rbrq(sc, &sc->rbrq_1, 1);
utopia_intr(&sc->utopia);
break;
default:
if_printf(&sc->ifatm.ifnet, "bad interrupt type %08x\n",
status);
break;
}
}
/* write back head to clear queue */
WRITE4(sc, HE_REGO_IRQ_HEAD(0),
((q->size - 1) << HE_REGS_IRQ_HEAD_SIZE) |
(q->thresh << HE_REGS_IRQ_HEAD_THRESH) |
(q->head << HE_REGS_IRQ_HEAD_HEAD));
BARRIER_W(sc);
/* workaround the back-to-back irq access problem (8.1.2) */
(void)READ4(sc, HE_REGO_INT_FIFO);
BARRIER_R(sc);
mtx_unlock(&sc->mtx);
}
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