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enic: add wq clean up budget

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In case of tx clean up, we set '-1' as budget. This means clean up until
wq is empty or till (1 << 32) pkts are cleaned. Under heavy load this
will run for long time and cause
"watchdog: BUG: soft lockup - CPU#25 stuck for 21s!" warning.

This patch sets wq clean up budget to 256.

Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan 2017-12-21 08:12:28 -08:00 committed by David S. Miller
parent 66364bdf3a
commit 18feb87105
2 changed files with 4 additions and 2 deletions
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2
drivers/net/ethernet/cisco/enic/enic.h
View File

@ -43,6 +43,8 @@
#define ENIC_CQ_MAX (ENIC_WQ_MAX + ENIC_RQ_MAX)
#define ENIC_INTR_MAX (ENIC_CQ_MAX + 2)
#define ENIC_WQ_NAPI_BUDGET 256
#define ENIC_AIC_LARGE_PKT_DIFF 3
struct enic_msix_entry {

4
drivers/net/ethernet/cisco/enic/enic_main.c
View File

@ -1500,7 +1500,7 @@ static int enic_poll(struct napi_struct *napi, int budget)
unsigned int cq_wq = enic_cq_wq(enic, 0);
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 wq_work_to_do = ENIC_WQ_NAPI_BUDGET;
unsigned int work_done, rq_work_done = 0, wq_work_done;
int err;
@ -1598,7 +1598,7 @@ static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
struct vnic_wq *wq = &enic->wq[wq_index];
unsigned int cq;
unsigned int intr;
unsigned int wq_work_to_do = -1; /* clean all desc possible */
unsigned int wq_work_to_do = ENIC_WQ_NAPI_BUDGET;
unsigned int wq_work_done;
unsigned int wq_irq;