diff options
| author | Karen Higgins <karen.higgins@qlogic.com> | 2013-01-20 23:51:00 -0500 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-01-30 13:47:16 +1100 |
| commit | 5b1c1bff07d579f8a7b672d4e5262d52eba5ef01 (patch) | |
| tree | 83b802ffe3e95af2c8e2ecfc1fc907143149f274 /drivers/scsi/qla4xxx/ql4_def.h | |
| parent | ff4108dce9e82acbde8e8b1899aaa4d91bf504b7 (diff) | |
[SCSI] qla4xxx: Throttle active IOCBs to firmware limits
Problem:
QLA4xxx firmware may assert if given more IOCBs than it can handle.
Solution:
The driver was updated to throttle the number of active IOCBs based
on the total number of IOCB buffers received from get_firmware_status
mbx_sts[2].
Signed-off-by: Karen Higgins <karen.higgins@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/qla4xxx/ql4_def.h')
| -rw-r--r-- | drivers/scsi/qla4xxx/ql4_def.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_def.h b/drivers/scsi/qla4xxx/ql4_def.h index 8f4193766663..ad580625a477 100644 --- a/drivers/scsi/qla4xxx/ql4_def.h +++ b/drivers/scsi/qla4xxx/ql4_def.h @@ -136,6 +136,7 @@ #define RESPONSE_QUEUE_DEPTH 64 #define QUEUE_SIZE 64 #define DMA_BUFFER_SIZE 512 +#define IOCB_HIWAT_CUSHION 4 /* * Misc @@ -540,6 +541,7 @@ struct scsi_qla_host { uint32_t tot_ddbs; uint16_t iocb_cnt; + uint16_t iocb_hiwat; /* SRB cache. */ #define SRB_MIN_REQ 128 |