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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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5
drivers/scsi/be2iscsi/be_main.h
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@@ -63,6 +63,7 @@
#define BE2_SGE 32
#define BE2_DEFPDU_HDR_SZ 64
#define BE2_DEFPDU_DATA_SZ 8192
#define BE2_MAX_NUM_CQ_PROC 512
#define MAX_CPUS 64
#define BEISCSI_MAX_NUM_CPUS 7
@@ -848,9 +849,9 @@ void beiscsi_free_mgmt_task_handles(struct beiscsi_conn *beiscsi_conn,
void hwi_ring_cq_db(struct beiscsi_hba *phba,
unsigned int id, unsigned int num_processed,
unsigned char rearm, unsigned char event);
unsigned char rearm);
unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq);
unsigned int beiscsi_process_cq(struct be_eq_obj *pbe_eq, int budget);
static inline bool beiscsi_error(struct beiscsi_hba *phba)
{