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Fix handling of Receiver Not Ready errors when doing polling.

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Also take this chance to cleanup the code in fxp_intr_body.

Add a missing block of code to disable interrupts when
reinitializing the interface while doing polling (the RELENG_4
version was correct).

MFC after: 3 days
This commit is contained in:
Luigi Rizzo 2002-08-04 22:33:28 +00:00
parent dde0b0ee97
commit 2b5989e943
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=101343
1 changed files with 82 additions and 50 deletions
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132
sys/dev/fxp/if_fxp.c
View File

@ -242,6 +242,9 @@ DRIVER_MODULE(if_fxp, pci, fxp_driver, fxp_devclass, 0, 0);
DRIVER_MODULE(if_fxp, cardbus, fxp_driver, fxp_devclass, 0, 0);
DRIVER_MODULE(miibus, fxp, miibus_driver, miibus_devclass, 0, 0);
static int fxp_rnr;
SYSCTL_INT(_hw, OID_AUTO, fxp_rnr, CTLFLAG_RW, &fxp_rnr, 0, "fxp rnr events");
/*
* Inline function to copy a 16-bit aligned 32-bit quantity.
*/
@ -1226,6 +1229,12 @@ static void
fxp_intr_body(struct fxp_softc *sc, u_int8_t statack, int count)
{
struct ifnet *ifp = &sc->sc_if;
struct mbuf *m;
struct fxp_rfa *rfa;
int rnr = (statack & FXP_SCB_STATACK_RNR) ? 1 : 0;
if (rnr)
fxp_rnr++;
/*
* Free any finished transmit mbuf chains.
@ -1264,71 +1273,85 @@ fxp_intr_body(struct fxp_softc *sc, u_int8_t statack, int count)
if (ifp->if_snd.ifq_head != NULL)
fxp_start(ifp);
}
/*
* Just return if nothing happened on the receive side.
*/
if ( (statack & (FXP_SCB_STATACK_FR | FXP_SCB_STATACK_RNR)) == 0)
return;
/*
* Process receiver interrupts. If a no-resource (RNR)
* condition exists, get whatever packets we can and
* re-start the receiver.
* When using polling, we do not process the list to completion,
* so when we get an RNR interrupt we must defer the restart
* until we hit the last buffer with the C bit set.
* If we run out of cycles and rfa_headm has the C bit set,
* record the pending RNR in an unused status bit, so that the
* info will be used in the subsequent polling cycle.
*/
if (statack & (FXP_SCB_STATACK_FR | FXP_SCB_STATACK_RNR)) {
struct mbuf *m;
struct fxp_rfa *rfa;
rcvloop:
#define FXP_RFA_RNRMARK 0x4000 /* used to mark a pending RNR intr */
for (;;) {
m = sc->rfa_headm;
rfa = (struct fxp_rfa *)(m->m_ext.ext_buf +
RFA_ALIGNMENT_FUDGE);
#ifdef DEVICE_POLLING /* loop at most count times if count >=0 */
if (count < 0 || count-- > 0)
#endif
if (rfa->rfa_status & FXP_RFA_STATUS_C) {
/*
* Remove first packet from the chain.
*/
sc->rfa_headm = m->m_next;
m->m_next = NULL;
if (count >= 0 && count-- == 0)
break;
#endif /* DEVICE_POLLING */
if ( (rfa->rfa_status & FXP_RFA_STATUS_C) == 0)
break;
if (rfa->rfa_status & FXP_RFA_RNRMARK)
rnr = 1;
/*
* Remove first packet from the chain.
*/
sc->rfa_headm = m->m_next;
m->m_next = NULL;
/*
* Add a new buffer to the receive chain.
* If this fails, the old buffer is recycled
* instead.
*/
if (fxp_add_rfabuf(sc, m) == 0) {
struct ether_header *eh;
int total_len;
/*
* Add a new buffer to the receive chain.
* If this fails, the old buffer is recycled
* instead.
* Fetch packet length (the top 2 bits of
* actual_size are flags set by the controller
* upon completion), and drop the packet in case
* of bogus length or CRC errors.
*/
if (fxp_add_rfabuf(sc, m) == 0) {
struct ether_header *eh;
int total_len;
total_len = rfa->actual_size &
(MCLBYTES - 1);
if (total_len <
sizeof(struct ether_header)) {
m_freem(m);
goto rcvloop;
}
/*
* Drop the packet if it has CRC
* errors. This test is only needed
* when doing 802.1q VLAN on the 82557
* chip.
*/
if (rfa->rfa_status &
FXP_RFA_STATUS_CRC) {
m_freem(m);
goto rcvloop;
}
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = total_len;
eh = mtod(m, struct ether_header *);
m->m_data +=
sizeof(struct ether_header);
m->m_len -=
sizeof(struct ether_header);
m->m_pkthdr.len = m->m_len;
ether_input(ifp, eh, m);
total_len = rfa->actual_size & 0x3fff;
if (total_len < sizeof(struct ether_header) ||
total_len > MCLBYTES - RFA_ALIGNMENT_FUDGE -
sizeof(struct fxp_rfa) ||
rfa->rfa_status & FXP_RFA_STATUS_CRC) {
m_freem(m);
continue;
}
goto rcvloop;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = total_len;
eh = mtod(m, struct ether_header *);
m->m_data += sizeof(struct ether_header);
m->m_len -= sizeof(struct ether_header);
m->m_pkthdr.len = m->m_len;
ether_input(ifp, eh, m);
}
if (statack & FXP_SCB_STATACK_RNR) {
}
if (rnr) {
if (rfa->rfa_status & FXP_RFA_STATUS_C)
rfa->rfa_status |= FXP_RFA_RNRMARK;
else {
fxp_scb_wait(sc);
CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL,
vtophys(sc->rfa_headm->m_ext.ext_buf) +
@ -1763,6 +1786,15 @@ fxp_init(void *xsc)
/*
* Enable interrupts.
*/
#ifdef DEVICE_POLLING
/*
* ... but only do that if we are not polling. And because (presumably)
* the default is interrupts on, we need to disable them explicitly!
*/
if ( ifp->if_ipending & IFF_POLLING )
CSR_WRITE_1(sc, FXP_CSR_SCB_INTRCNTL, FXP_SCB_INTR_DISABLE);
else
#endif /* DEVICE_POLLING */
CSR_WRITE_1(sc, FXP_CSR_SCB_INTRCNTL, 0);
splx(s);