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enic: Don't receive packets when the napi budget == 0

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Processing any incoming packets with a with a napi budget of 0
is incorrect driver behavior.

This matters as netpoll will shortly call drivers with a budget of 0
to avoid receive packet processing happening in hard irq context.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2014-03-14 18:02:08 -07:00 committed by David S. Miller
parent 278d5385b1
commit 4c50254902
1 changed files with 8 additions and 6 deletions
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14
drivers/net/ethernet/cisco/enic/enic_main.c
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@ -1086,14 +1086,15 @@ static int enic_poll(struct napi_struct *napi, int budget)
unsigned int intr = enic_legacy_io_intr();
unsigned int rq_work_to_do = budget;
unsigned int wq_work_to_do = -1; /* no limit */
unsigned int work_done, rq_work_done, wq_work_done;
unsigned int work_done, rq_work_done = 0, wq_work_done;
int err;
/* Service RQ (first) and WQ
*/
rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
rq_work_to_do, enic_rq_service, NULL);
if (budget > 0)
rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
rq_work_to_do, enic_rq_service, NULL);
wq_work_done = vnic_cq_service(&enic->cq[cq_wq],
wq_work_to_do, enic_wq_service, NULL);
@ -1141,14 +1142,15 @@ static int enic_poll_msix(struct napi_struct *napi, int budget)
unsigned int cq = enic_cq_rq(enic, rq);
unsigned int intr = enic_msix_rq_intr(enic, rq);
unsigned int work_to_do = budget;
unsigned int work_done;
unsigned int work_done = 0;
int err;
/* Service RQ
*/
work_done = vnic_cq_service(&enic->cq[cq],
work_to_do, enic_rq_service, NULL);
if (budget > 0)
work_done = vnic_cq_service(&enic->cq[cq],
work_to_do, enic_rq_service, NULL);
/* Return intr event credits for this polling
* cycle. An intr event is the completion of a