[SCSI] lpfc 8.2.8 v2 : Add sysfs control of target queue depth handling

Added new sysfs attribute lpfc_max_scsicmpl_time. Attribute, when enabled,
will control target queue depth based on I/O completion time.

Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index 181538466117..3a500d683065 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -34,6 +34,11 @@ struct lpfc_sli2_slim;
 #define LPFC_IOCB_LIST_CNT      2250    /* list of IOCBs for fast-path usage. */
 #define LPFC_Q_RAMP_UP_INTERVAL 120     /* lun q_depth ramp up interval */
 #define LPFC_VNAME_LEN          100     /* vport symbolic name length */
+#define LPFC_TGTQ_INTERVAL      40000   /* Min amount of time between tgt
+                                           queue depth change in millisecs */
+#define LPFC_TGTQ_RAMPUP_PCENT  5       /* Target queue rampup in percentage */
+#define LPFC_MIN_TGT_QDEPTH     100
+#define LPFC_MAX_TGT_QDEPTH     0xFFFF
 
 /*
  * Following time intervals are used of adjusting SCSI device
@@ -363,6 +368,7 @@ struct lpfc_vport {
         uint32_t cfg_log_verbose;
         uint32_t cfg_max_luns;
         uint32_t cfg_enable_da_id;
+        uint32_t cfg_max_scsicmpl_time;
 
         uint32_t dev_loss_tmo_changed;