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scsi: qla2xxx: Add boundary checks for exchanges to be offloaded

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Max boundary for exchange off load is 32k exchanges. If a system
is unable to allocate large memory buffer to support this feature,
then driver will reduce the number of exchanges down to a value
system can support.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran
2017-12-28 12:33:12 -08:00
committed by Martin K. Petersen
parent 3407fc373d
commit d1e3635a5e
2 changed files with 33 additions and 9 deletions
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3
drivers/scsi/qla2xxx/qla_def.h
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@@ -288,6 +288,8 @@ struct name_list_extended {
#define ATIO_ENTRY_CNT_24XX 4096 /* Number of ATIO entries. */
#define RESPONSE_ENTRY_CNT_FX00 256 /* Number of response entries.*/
#define FW_DEF_EXCHANGES_CNT 2048
#define FW_MAX_EXCHANGES_CNT (32 * 1024)
#define REDUCE_EXCHANGES_CNT (8 * 1024)
struct req_que;
struct qla_tgt_sess;
@@ -3506,6 +3508,7 @@ struct qla_hw_data {
uint32_t using_lr_setting:1;
} flags;
uint16_t max_exchg;
uint16_t long_range_distance; /* 32G & above */
#define LR_DISTANCE_5K 1
#define LR_DISTANCE_10K 0