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be2iscsi: Fix IOPOLL implementation

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OS not responding when running 2 port traffic on 72 CPUs system.

be2iscsi IRQs gets affined to CPU0 when irqbalancer is disabled.
be_iopoll processing completions in BLOCK_IOPOLL_SOFTIRQ hogged CPU0.

1. Use budget to exit the polling loop. beiscsi_process_cq didn't honour
   it.
2. Rearming of EQ is done only after iopoll completes.

[mkp: Fixed up blk_iopoll -> irq_poll transition]

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@avagotech.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Jitendra Bhivare
2016-01-20 14:10:56 +05:30
committed by Martin K. Petersen
parent 23d7ccf134
commit 1094cf68e8
4 changed files with 52 additions and 42 deletions
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2
drivers/scsi/be2iscsi/be_iscsi.c
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@@ -1298,7 +1298,7 @@ static void beiscsi_flush_cq(struct beiscsi_hba *phba)
for (i = 0; i < phba->num_cpus; i++) {
pbe_eq = &phwi_context->be_eq[i];
irq_poll_disable(&pbe_eq->iopoll);
beiscsi_process_cq(pbe_eq);
beiscsi_process_cq(pbe_eq, BE2_MAX_NUM_CQ_PROC);
irq_poll_enable(&pbe_eq->iopoll);
}
}