[SCSI] fnic: fnic Driver Tuneables Exposed through CLI

Introduced module params to provide dynamic way of configuring
queue depth.

Added support to get max io throttle count through UCSM to
configure maximum outstanding IOs supported by fnic and push
that value to scsi mid-layer.

  Supported IO throttle values:

  UCSM IO THROTTLE VALUE        FNIC MAX OUTSTANDING IOS
  ------------------------------------------------------
        16 (Default)                    2048
        <= 256                          256
        > 256                           <ucsm value>

Signed-off-by: Hiral Patel <hiralpat@cisco.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/fnic/fnic.h b/drivers/scsi/fnic/fnic.h
index d276aaf84f18..e4dd3d7cd236 100644
--- a/drivers/scsi/fnic/fnic.h
+++ b/drivers/scsi/fnic/fnic.h
@@ -43,6 +43,8 @@
 #define DFX                     DRV_NAME "%d: "
 
 #define DESC_CLEAN_LOW_WATERMARK 8
+#define FNIC_UCSM_DFLT_THROTTLE_CNT_BLD 16 /* UCSM default throttle count */
+#define FNIC_MIN_IO_REQ                 256 /* Min IO throttle count */
 #define FNIC_MAX_IO_REQ         2048 /* scsi_cmnd tag map entries */
 #define FNIC_IO_LOCKS           64 /* IO locks: power of 2 */
 #define FNIC_DFLT_QUEUE_DEPTH   32
@@ -223,6 +225,7 @@ struct fnic {
         char name[IFNAMSIZ];
         struct timer_list notify_timer; /* used for MSI interrupts */
 
+        unsigned int fnic_max_tag_id;
         unsigned int err_intr_offset;
         unsigned int link_intr_offset;