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enic: fix issues in enic_poll

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In enic_poll, we clean tx and rx queues, when low latency busy socket polling
is happening, enic_poll will only clean tx queue. After cleaning tx, it should
return total budget for re-poll.

There is a small window between vnic_intr_unmask() and enic_poll_unlock_napi().
In this window if an irq occurs and napi is scheduled on different cpu, it tries
to acquire enic_poll_lock_napi() and fails. Unlock napi_poll before unmasking
the interrupt.

v2:
Do not change tx wonk done behaviour. Consider only rx work done for completing
napi.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan 2015-07-01 14:21:57 +05:30 committed by David S. Miller
parent a611fb75d0
commit 25c14ef86a
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/cisco/enic/enic_main.c
View file

@ -1170,7 +1170,7 @@ static int enic_poll(struct napi_struct *napi, int budget)
wq_work_done,
0 /* dont unmask intr */,
0 /* dont reset intr timer */);
return rq_work_done;
return budget;
}
if (budget > 0)
@ -1191,6 +1191,7 @@ static int enic_poll(struct napi_struct *napi, int budget)
0 /* don't reset intr timer */);
err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
enic_poll_unlock_napi(&enic->rq[cq_rq], napi);
/* Buffer allocation failed. Stay in polling
* mode so we can try to fill the ring again.
@ -1208,7 +1209,6 @@ static int enic_poll(struct napi_struct *napi, int budget)
napi_complete(napi);
vnic_intr_unmask(&enic->intr[intr]);
}
enic_poll_unlock_napi(&enic->rq[cq_rq], napi);
return rq_work_done;
}