Author: jfv
Date: Mon Apr 27 17:22:14 2009
New Revision: 191566
URL: http://svn.freebsd.org/changeset/base/191566
Log:
Thanks for Michael Tuexen for tracking down a path where
the watchdog timer was not being rearmed in txeof, and also
a missing case in the new code.
MFC after: 2 weeks
Modified:
head/sys/dev/e1000/if_em.c
Modified: head/sys/dev/e1000/if_em.c
==============================================================================
--- head/sys/dev/e1000/if_em.c Mon Apr 27 16:57:19 2009 (r191565)
+++ head/sys/dev/e1000/if_em.c Mon Apr 27 17:22:14 2009 (r191566)
@@ -1013,12 +1013,15 @@ em_transmit_locked(struct ifnet *ifp, st
if (ADAPTER_RING_EMPTY(adapter) &&
(adapter->num_tx_desc_avail > EM_TX_OP_THRESHOLD)) {
if (em_xmit(adapter, &m)) {
- if (m && (error = drbr_enqueue(ifp, adapter->br, m)) !=
0) {
+ if (m && (error = drbr_enqueue(ifp, adapter->br, m)) !=
0)
return (error);
- }
- } else{
- /* Send a copy of the frame to the BPF listener */
+ } else {
+ /*
+ ** Send a copy of the frame to the BPF
+ ** listener and set the watchdog on.
+ */
ETHER_BPF_MTAP(ifp, m);
+ addapter->watchdog_timer = EM_TX_TIMEOUT;
}
} else if ((error = drbr_enqueue(ifp, adapter->br, m)) != 0)
return (error);
@@ -1086,6 +1089,8 @@ em_start_locked(struct ifnet *ifp)
if (em_xmit(adapter, &m_head)) {
if (m_head == NULL)
break;
+ ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+ IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
break;
}
@@ -4029,6 +4034,7 @@ static void
em_txeof(struct adapter *adapter)
{
int first, last, done, num_avail;
+ u32 cleaned = 0;
struct em_buffer *tx_buffer;
struct e1000_tx_desc *tx_desc, *eop_desc;
struct ifnet *ifp = adapter->ifp;
@@ -4064,7 +4070,7 @@ em_txeof(struct adapter *adapter)
tx_desc->upper.data = 0;
tx_desc->lower.data = 0;
tx_desc->buffer_addr = 0;
- num_avail++;
+ ++num_avail; ++cleaned;
if (tx_buffer->m_head) {
ifp->if_opackets++;
@@ -4101,21 +4107,22 @@ em_txeof(struct adapter *adapter)
adapter->next_tx_to_clean = first;
/*
- * If we have enough room, clear IFF_DRV_OACTIVE to tell the stack
- * that it is OK to send packets.
- * If there are no pending descriptors, clear the timeout. Otherwise,
- * if some descriptors have been freed, restart the timeout.
+ * If we have enough room, clear IFF_DRV_OACTIVE to
+ * tell the stack that it is OK to send packets.
+ * If there are no pending descriptors, clear the timeout.
*/
if (num_avail > EM_TX_CLEANUP_THRESHOLD) {
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
- /* All clean, turn off the timer */
if (num_avail == adapter->num_tx_desc) {
adapter->watchdog_timer = 0;
- } else
- /* Some cleaned, reset the timer */
- if (num_avail != adapter->num_tx_desc_avail)
- adapter->watchdog_timer = EM_TX_TIMEOUT;
+ adapter->num_tx_desc_avail = num_avail;
+ return;
+ }
}
+
+ /* If any descriptors cleaned, reset the watchdog */
+ if (cleaned)
+ adapter->watchdog_timer = EM_TX_TIMEOUT;
adapter->num_tx_desc_avail = num_avail;
return;
}
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