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Fix if_vr's handling of vr_encap failures. 3 parts:

Browse source 
- Don't bother setting OACTIVE when the descriptors are all full
  or there's a vr_encap failure, it doesn't help anything.
- Correctly roll back on the descriptor list after a failure
  so as not to corrupt the list.
- Add a missing VR_UNLOCK().

Without these changes, vr_encap failure (which is assured during
a low mbuf situation) would result in the card locking until
the watchdog could fire.

MFC after:	1 week
This commit is contained in:
Mike Silbersack 2003-04-09 02:21:54 +00:00
parent cf0e07e504
commit db5f2ca8df
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=113274
2 changed files with 18 additions and 20 deletions
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19
sys/dev/vr/if_vr.c
View file

@ -1414,7 +1414,6 @@ vr_encap(sc, c, m_head)
m_new = m_defrag(m_head, M_DONTWAIT);
if (m_new == NULL) {
printf("vr%d: no memory for tx list\n", sc->vr_unit);
return(1);
}
@ -1456,22 +1455,18 @@ vr_start(ifp)
{
struct vr_softc *sc;
struct mbuf *m_head = NULL;
struct vr_chain *cur_tx = NULL, *start_tx;
struct vr_chain *cur_tx = NULL, *start_tx, *prev_tx;
sc = ifp->if_softc;
VR_LOCK(sc);
if (ifp->if_flags & IFF_OACTIVE) {
VR_UNLOCK(sc);
return;
}
/*
* Check for an available queue slot. If there are none,
* punt.
*/
if (sc->vr_cdata.vr_tx_free->vr_mbuf != NULL) {
ifp->if_flags |= IFF_OACTIVE;
VR_UNLOCK(sc);
return;
}
@ -1483,14 +1478,16 @@ vr_start(ifp)
break;
/* Pick a descriptor off the free list. */
prev_tx = cur_tx;
cur_tx = sc->vr_cdata.vr_tx_free;
sc->vr_cdata.vr_tx_free = cur_tx->vr_nextdesc;
/* Pack the data into the descriptor. */
if (vr_encap(sc, cur_tx, m_head)) {
/* Rollback, send what we were able to encap. */
IF_PREPEND(&ifp->if_snd, m_head);
ifp->if_flags |= IFF_OACTIVE;
cur_tx = NULL;
sc->vr_cdata.vr_tx_free = cur_tx;
cur_tx = prev_tx;
break;
}
@ -1504,7 +1501,6 @@ vr_start(ifp)
BPF_MTAP(ifp, cur_tx->vr_mbuf);
VR_TXOWN(cur_tx) = VR_TXSTAT_OWN;
VR_SETBIT16(sc, VR_COMMAND, /*VR_CMD_TX_ON|*/VR_CMD_TX_GO);
}
/*
@ -1519,6 +1515,9 @@ vr_start(ifp)
if (sc->vr_cdata.vr_tx_head == NULL)
sc->vr_cdata.vr_tx_head = start_tx;
/* Tell the chip to start transmitting. */
VR_SETBIT16(sc, VR_COMMAND, /*VR_CMD_TX_ON|*/VR_CMD_TX_GO);
/*
* Set a timeout in case the chip goes out to lunch.

19
sys/pci/if_vr.c
View file

@ -1414,7 +1414,6 @@ vr_encap(sc, c, m_head)
m_new = m_defrag(m_head, M_DONTWAIT);
if (m_new == NULL) {
printf("vr%d: no memory for tx list\n", sc->vr_unit);
return(1);
}
@ -1456,22 +1455,18 @@ vr_start(ifp)
{
struct vr_softc *sc;
struct mbuf *m_head = NULL;
struct vr_chain *cur_tx = NULL, *start_tx;
struct vr_chain *cur_tx = NULL, *start_tx, *prev_tx;
sc = ifp->if_softc;
VR_LOCK(sc);
if (ifp->if_flags & IFF_OACTIVE) {
VR_UNLOCK(sc);
return;
}
/*
* Check for an available queue slot. If there are none,
* punt.
*/
if (sc->vr_cdata.vr_tx_free->vr_mbuf != NULL) {
ifp->if_flags |= IFF_OACTIVE;
VR_UNLOCK(sc);
return;
}
@ -1483,14 +1478,16 @@ vr_start(ifp)
break;
/* Pick a descriptor off the free list. */
prev_tx = cur_tx;
cur_tx = sc->vr_cdata.vr_tx_free;
sc->vr_cdata.vr_tx_free = cur_tx->vr_nextdesc;
/* Pack the data into the descriptor. */
if (vr_encap(sc, cur_tx, m_head)) {
/* Rollback, send what we were able to encap. */
IF_PREPEND(&ifp->if_snd, m_head);
ifp->if_flags |= IFF_OACTIVE;
cur_tx = NULL;
sc->vr_cdata.vr_tx_free = cur_tx;
cur_tx = prev_tx;
break;
}
@ -1504,7 +1501,6 @@ vr_start(ifp)
BPF_MTAP(ifp, cur_tx->vr_mbuf);
VR_TXOWN(cur_tx) = VR_TXSTAT_OWN;
VR_SETBIT16(sc, VR_COMMAND, /*VR_CMD_TX_ON|*/VR_CMD_TX_GO);
}
/*
@ -1519,6 +1515,9 @@ vr_start(ifp)
if (sc->vr_cdata.vr_tx_head == NULL)
sc->vr_cdata.vr_tx_head = start_tx;
/* Tell the chip to start transmitting. */
VR_SETBIT16(sc, VR_COMMAND, /*VR_CMD_TX_ON|*/VR_CMD_TX_GO);
/*
* Set a timeout in case the chip goes out to lunch.