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freebsd-dev/sys/dev/le/am7990.c
Marius Strobl 0c05ab41ab - In the interrupt handler clear the interrupt source flags before 
processing the interrupt events. If we clear them afterwards we
  can completely miss some events as the NIC can change the source
  flags while we're in the handler. In order to not get another
  interrupt while we're in ifp->if_input() with the driver lock
  dropped we now turn off NIC interrupts while in the interrupt
  handler. Previously this was meant to be achieved by clearing the
  interrupt source flags after processing the interrupt events but
  didn't really work as clearing these flags doesn't actually
  acknowledge and re-enable the events.
  This fixes the device timeouts seen with the VMware LANCE.
- Relax the watchdog timer somewhat; don't enable it until the last
  packet is enqueued and if there is a TX interrupt but there are
  still outstanding ones reload the timer.

Reported and tested by:	Morten Rodal <morten@rodal.no>
MFC after:		3 days
2006-02-21 20:20:43 +00:00

600 lines
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/* $NetBSD: am7990.c,v 1.68 2005/12/11 12:21:25 christos Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
* Simulation Facility, NASA Ames Research Center.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell and Rick Macklem.
*
* 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_le.c 8.2 (Berkeley) 11/16/93
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/socket.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_var.h>
#include <dev/le/lancereg.h>
#include <dev/le/lancevar.h>
#include <dev/le/am7990reg.h>
#include <dev/le/am7990var.h>
static void am7990_meminit(struct lance_softc *);
static void am7990_rint(struct lance_softc *);
static void am7990_tint(struct lance_softc *);
static void am7990_start_locked(struct lance_softc *sc);
#ifdef LEDEBUG
static void am7990_recv_print(struct lance_softc *, int);
static void am7990_xmit_print(struct lance_softc *, int);
#endif
int
am7990_config(struct am7990_softc *sc, const char* name, int unit)
{
int error, mem;
sc->lsc.sc_meminit = am7990_meminit;
sc->lsc.sc_start_locked = am7990_start_locked;
error = lance_config(&sc->lsc, name, unit);
if (error != 0)
return (error);
mem = 0;
sc->lsc.sc_initaddr = mem;
mem += sizeof(struct leinit);
sc->lsc.sc_rmdaddr = mem;
mem += sizeof(struct lermd) * sc->lsc.sc_nrbuf;
sc->lsc.sc_tmdaddr = mem;
mem += sizeof(struct letmd) * sc->lsc.sc_ntbuf;
sc->lsc.sc_rbufaddr = mem;
mem += LEBLEN * sc->lsc.sc_nrbuf;
sc->lsc.sc_tbufaddr = mem;
mem += LEBLEN * sc->lsc.sc_ntbuf;
if (mem > sc->lsc.sc_memsize)
panic("%s: memsize", __func__);
lance_attach(&sc->lsc);
return (0);
}
void
am7990_detach(struct am7990_softc *sc)
{
lance_detach(&sc->lsc);
}
/*
* Set up the initialization block and the descriptor rings.
*/
static void
am7990_meminit(struct lance_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
struct leinit init;
struct lermd rmd;
struct letmd tmd;
u_long a;
int bix;
LE_LOCK_ASSERT(sc, MA_OWNED);
if (ifp->if_flags & IFF_PROMISC)
init.init_mode = LE_MODE_NORMAL | LE_MODE_PROM;
else
init.init_mode = LE_MODE_NORMAL;
init.init_padr[0] = (sc->sc_enaddr[1] << 8) | sc->sc_enaddr[0];
init.init_padr[1] = (sc->sc_enaddr[3] << 8) | sc->sc_enaddr[2];
init.init_padr[2] = (sc->sc_enaddr[5] << 8) | sc->sc_enaddr[4];
lance_setladrf(sc, init.init_ladrf);
sc->sc_last_rd = 0;
sc->sc_first_td = sc->sc_last_td = sc->sc_no_td = 0;
a = sc->sc_addr + LE_RMDADDR(sc, 0);
init.init_rdra = a;
init.init_rlen = (a >> 16) | ((ffs(sc->sc_nrbuf) - 1) << 13);
a = sc->sc_addr + LE_TMDADDR(sc, 0);
init.init_tdra = a;
init.init_tlen = (a >> 16) | ((ffs(sc->sc_ntbuf) - 1) << 13);
(*sc->sc_copytodesc)(sc, &init, LE_INITADDR(sc), sizeof(init));
/*
* Set up receive ring descriptors.
*/
for (bix = 0; bix < sc->sc_nrbuf; bix++) {
a = sc->sc_addr + LE_RBUFADDR(sc, bix);
rmd.rmd0 = a;
rmd.rmd1_hadr = a >> 16;
rmd.rmd1_bits = LE_R1_OWN;
rmd.rmd2 = -LEBLEN | LE_XMD2_ONES;
rmd.rmd3 = 0;
(*sc->sc_copytodesc)(sc, &rmd, LE_RMDADDR(sc, bix),
sizeof(rmd));
}
/*
* Set up transmit ring descriptors.
*/
for (bix = 0; bix < sc->sc_ntbuf; bix++) {
a = sc->sc_addr + LE_TBUFADDR(sc, bix);
tmd.tmd0 = a;
tmd.tmd1_hadr = a >> 16;
tmd.tmd1_bits = 0;
tmd.tmd2 = LE_XMD2_ONES;
tmd.tmd3 = 0;
(*sc->sc_copytodesc)(sc, &tmd, LE_TMDADDR(sc, bix),
sizeof(tmd));
}
}
static void
am7990_rint(struct lance_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
struct lermd rmd;
int bix, rp;
bix = sc->sc_last_rd;
/* Process all buffers with valid data. */
for (;;) {
rp = LE_RMDADDR(sc, bix);
(*sc->sc_copyfromdesc)(sc, &rmd, rp, sizeof(rmd));
if (rmd.rmd1_bits & LE_R1_OWN)
break;
if (rmd.rmd1_bits & LE_R1_ERR) {
if (rmd.rmd1_bits & LE_R1_ENP) {
#ifdef LEDEBUG
if ((rmd.rmd1_bits & LE_R1_OFLO) == 0) {
if (rmd.rmd1_bits & LE_R1_FRAM)
if_printf(ifp,
"framing error\n");
if (rmd.rmd1_bits & LE_R1_CRC)
if_printf(ifp,
"crc mismatch\n");
}
#endif
} else {
if (rmd.rmd1_bits & LE_R1_OFLO)
if_printf(ifp, "overflow\n");
}
if (rmd.rmd1_bits & LE_R1_BUFF)
if_printf(ifp, "receive buffer error\n");
ifp->if_ierrors++;
} else if ((rmd.rmd1_bits & (LE_R1_STP | LE_R1_ENP)) !=
(LE_R1_STP | LE_R1_ENP)) {
if_printf(ifp, "dropping chained buffer\n");
ifp->if_ierrors++;
} else {
#ifdef LEDEBUG
if (sc->sc_flags & LE_DEBUG)
am7990_recv_print(sc, sc->sc_last_rd);
#endif
lance_read(sc, LE_RBUFADDR(sc, bix),
(int)rmd.rmd3 - ETHER_CRC_LEN);
}
rmd.rmd1_bits = LE_R1_OWN;
rmd.rmd2 = -LEBLEN | LE_XMD2_ONES;
rmd.rmd3 = 0;
(*sc->sc_copytodesc)(sc, &rmd, rp, sizeof(rmd));
#ifdef LEDEBUG
if (sc->sc_flags & LE_DEBUG)
if_printf(ifp, "sc->sc_last_rd = %x, rmd: "
"ladr %04x, hadr %02x, flags %02x, "
"bcnt %04x, mcnt %04x\n",
sc->sc_last_rd, rmd.rmd0, rmd.rmd1_hadr,
rmd.rmd1_bits, rmd.rmd2, rmd.rmd3);
#endif
if (++bix == sc->sc_nrbuf)
bix = 0;
}
sc->sc_last_rd = bix;
}
static void
am7990_tint(struct lance_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
struct letmd tmd;
int bix;
bix = sc->sc_first_td;
for (;;) {
if (sc->sc_no_td <= 0)
break;
(*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, bix),
sizeof(tmd));
#ifdef LEDEBUG
if (sc->sc_flags & LE_DEBUG)
if_printf(ifp, "trans tmd: "
"ladr %04x, hadr %02x, flags %02x, "
"bcnt %04x, mcnt %04x\n",
tmd.tmd0, tmd.tmd1_hadr, tmd.tmd1_bits,
tmd.tmd2, tmd.tmd3);
#endif
if (tmd.tmd1_bits & LE_T1_OWN)
break;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
if (tmd.tmd1_bits & LE_T1_ERR) {
if (tmd.tmd3 & LE_T3_BUFF)
if_printf(ifp, "transmit buffer error\n");
else if (tmd.tmd3 & LE_T3_UFLO)
if_printf(ifp, "underflow\n");
if (tmd.tmd3 & (LE_T3_BUFF | LE_T3_UFLO)) {
lance_init_locked(sc);
return;
}
if (tmd.tmd3 & LE_T3_LCAR) {
if (sc->sc_flags & LE_CARRIER)
if_link_state_change(ifp,
LINK_STATE_DOWN);
sc->sc_flags &= ~LE_CARRIER;
if (sc->sc_nocarrier)
(*sc->sc_nocarrier)(sc);
else
if_printf(ifp, "lost carrier\n");
}
if (tmd.tmd3 & LE_T3_LCOL)
ifp->if_collisions++;
if (tmd.tmd3 & LE_T3_RTRY) {
#ifdef LEDEBUG
if_printf(ifp, "excessive collisions, tdr %d\n",
tmd.tmd3 & LE_T3_TDR_MASK);
#endif
ifp->if_collisions += 16;
}
ifp->if_oerrors++;
} else {
if (tmd.tmd1_bits & LE_T1_ONE)
ifp->if_collisions++;
else if (tmd.tmd1_bits & LE_T1_MORE)
/* Real number is unknown. */
ifp->if_collisions += 2;
ifp->if_opackets++;
}
if (++bix == sc->sc_ntbuf)
bix = 0;
--sc->sc_no_td;
}
sc->sc_first_td = bix;
ifp->if_timer = sc->sc_no_td > 0 ? 5 : 0;
}
/*
* Controller interrupt
*/
void
am7990_intr(void *arg)
{
struct lance_softc *sc = arg;
struct ifnet *ifp = sc->sc_ifp;
uint16_t isr;
LE_LOCK(sc);
if (sc->sc_hwintr && (*sc->sc_hwintr)(sc) == -1) {
ifp->if_ierrors++;
lance_init_locked(sc);
LE_UNLOCK(sc);
return;
}
isr = (*sc->sc_rdcsr)(sc, LE_CSR0);
#if defined(LEDEBUG) && LEDEBUG > 1
if (sc->sc_flags & LE_DEBUG)
if_printf(ifp, "%s: entering with isr=%04x\n", __func__, isr);
#endif
if ((isr & LE_C0_INTR) == 0) {
LE_UNLOCK(sc);
return;
}
/*
* Clear interrupt source flags and turn off interrupts. If we
* don't clear these flags before processing their sources we
* could completely miss some interrupt events as the the NIC
* can change these flags while we're in this handler. We turn
* of interrupts while processing them so we don't get another
* one while we still process the previous one in ifp->if_input()
* with the driver lock dropped.
*/
(*sc->sc_wrcsr)(sc, LE_CSR0, isr & ~(LE_C0_INEA | LE_C0_TDMD |
LE_C0_STOP | LE_C0_STRT | LE_C0_INIT));
if (isr & LE_C0_ERR) {
if (isr & LE_C0_BABL) {
#ifdef LEDEBUG
if_printf(ifp, "babble\n");
#endif
ifp->if_oerrors++;
}
#if 0
if (isr & LE_C0_CERR) {
if_printf(ifp, "collision error\n");
ifp->if_collisions++;
}
#endif
if (isr & LE_C0_MISS) {
#ifdef LEDEBUG
if_printf(ifp, "missed packet\n");
#endif
ifp->if_ierrors++;
}
if (isr & LE_C0_MERR) {
if_printf(ifp, "memory error\n");
lance_init_locked(sc);
LE_UNLOCK(sc);
return;
}
}
if ((isr & LE_C0_RXON) == 0) {
if_printf(ifp, "receiver disabled\n");
ifp->if_ierrors++;
lance_init_locked(sc);
LE_UNLOCK(sc);
return;
}
if ((isr & LE_C0_TXON) == 0) {
if_printf(ifp, "transmitter disabled\n");
ifp->if_oerrors++;
lance_init_locked(sc);
LE_UNLOCK(sc);
return;
}
/*
* Pretend we have carrier; if we don't this will be cleared shortly.
*/
if (!(sc->sc_flags & LE_CARRIER))
if_link_state_change(ifp, LINK_STATE_UP);
sc->sc_flags |= LE_CARRIER;
if (isr & LE_C0_RINT)
am7990_rint(sc);
if (isr & LE_C0_TINT)
am7990_tint(sc);
/* Enable interrupts again. */
(*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA);
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
am7990_start_locked(sc);
LE_UNLOCK(sc);
}
/*
* Set up output on interface.
* Get another datagram to send off of the interface queue, and map it to the
* interface before starting the output.
*/
static void
am7990_start_locked(struct lance_softc *sc)
{
struct ifnet *ifp = sc->sc_ifp;
struct letmd tmd;
struct mbuf *m;
int bix, enq, len, rp;
LE_LOCK_ASSERT(sc, MA_OWNED);
if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
IFF_DRV_RUNNING)
return;
bix = sc->sc_last_td;
enq = 0;
for (; sc->sc_no_td < sc->sc_ntbuf &&
!IFQ_DRV_IS_EMPTY(&ifp->if_snd);) {
rp = LE_TMDADDR(sc, bix);
(*sc->sc_copyfromdesc)(sc, &tmd, rp, sizeof(tmd));
if (tmd.tmd1_bits & LE_T1_OWN) {
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
if_printf(ifp,
"missing buffer, no_td = %d, last_td = %d\n",
sc->sc_no_td, sc->sc_last_td);
}
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
if (m == 0)
break;
/*
* If BPF is listening on this interface, let it see the packet
* before we commit it to the wire.
*/
BPF_MTAP(ifp, m);
/*
* Copy the mbuf chain into the transmit buffer.
*/
len = lance_put(sc, LE_TBUFADDR(sc, bix), m);
#ifdef LEDEBUG
if (len > ETHERMTU + ETHER_HDR_LEN)
if_printf(ifp, "packet length %d\n", len);
#endif
/*
* Init transmit registers, and set transmit start flag.
*/
tmd.tmd1_bits = LE_T1_OWN | LE_T1_STP | LE_T1_ENP;
tmd.tmd2 = -len | LE_XMD2_ONES;
tmd.tmd3 = 0;
(*sc->sc_copytodesc)(sc, &tmd, rp, sizeof(tmd));
#ifdef LEDEBUG
if (sc->sc_flags & LE_DEBUG)
am7990_xmit_print(sc, sc->sc_last_td);
#endif
(*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_TDMD);
enq++;
if (++bix == sc->sc_ntbuf)
bix = 0;
if (++sc->sc_no_td == sc->sc_ntbuf) {
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
break;
}
}
sc->sc_last_td = bix;
if (enq > 0)
ifp->if_timer = 5;
}
#ifdef LEDEBUG
static void
am7990_recv_print(struct lance_softc *sc, int no)
{
struct ifnet *ifp = sc->sc_ifp;
struct ether_header eh;
struct lermd rmd;
uint16_t len;
(*sc->sc_copyfromdesc)(sc, &rmd, LE_RMDADDR(sc, no), sizeof(rmd));
len = rmd.rmd3;
if_printf(ifp, "receive buffer %d, len = %d\n", no, len);
if_printf(ifp, "status %04x\n", (*sc->sc_rdcsr)(sc, LE_CSR0));
if_printf(ifp,
"ladr %04x, hadr %02x, flags %02x, bcnt %04x, mcnt %04x\n",
rmd.rmd0, rmd.rmd1_hadr, rmd.rmd1_bits, rmd.rmd2, rmd.rmd3);
if (len - ETHER_CRC_LEN >= sizeof(eh)) {
(*sc->sc_copyfrombuf)(sc, &eh, LE_RBUFADDR(sc, no), sizeof(eh));
if_printf(ifp, "dst %s", ether_sprintf(eh.ether_dhost));
printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
ntohs(eh.ether_type));
}
}
static void
am7990_xmit_print(struct lance_softc *sc, int no)
{
struct ifnet *ifp = sc->sc_ifp;
struct ether_header eh;
struct letmd tmd;
uint16_t len;
(*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, no), sizeof(tmd));
len = -tmd.tmd2;
if_printf(ifp, "transmit buffer %d, len = %d\n", no, len);
if_printf(ifp, "status %04x\n", (*sc->sc_rdcsr)(sc, LE_CSR0));
if_printf(ifp,
"ladr %04x, hadr %02x, flags %02x, bcnt %04x, mcnt %04x\n",
tmd.tmd0, tmd.tmd1_hadr, tmd.tmd1_bits, tmd.tmd2, tmd.tmd3);
if (len >= sizeof(eh)) {
(*sc->sc_copyfrombuf)(sc, &eh, LE_TBUFADDR(sc, no), sizeof(eh));
if_printf(ifp, "dst %s", ether_sprintf(eh.ether_dhost));
printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
ntohs(eh.ether_type));
}
}
#endif /* LEDEBUG */
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