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authorKrishna Gudipati <kgudipat@brocade.com>2012-09-21 17:26:41 -0700
committerJames Bottomley <JBottomley@Parallels.com>2012-10-07 11:21:29 +0100
commit7ace27ae28a5fa67fa3d25f31d1111991c81e015 (patch)
tree841612f109ef2b32d15613aa8093d683a6261356 /drivers/scsi/bfa/bfad_bsg.c
parent6894f013a71b1bcd09f46b8071f0c6b55fc58139 (diff)
downloadlinux-next-7ace27ae28a5fa67fa3d25f31d1111991c81e015.tar.gz
[SCSI] bfa: Add support for IO throttling at port level
Add capability to limit the number of exchanges on a port to avoid queue-full conditions from the target side. Signed-off-by: Sudarsana Reddy Kalluru <skalluru@brocade.com> Signed-off-by: Krishna Gudipati <kgudipat@brocade.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/bfa/bfad_bsg.c')
-rw-r--r--drivers/scsi/bfa/bfad_bsg.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/scsi/bfa/bfad_bsg.c b/drivers/scsi/bfa/bfad_bsg.c
index 90c40e4e2d4b..6e1478ae6251 100644
--- a/drivers/scsi/bfa/bfad_bsg.c
+++ b/drivers/scsi/bfa/bfad_bsg.c
@@ -2547,6 +2547,36 @@ bfad_iocmd_fcpim_cfg_lunmask(struct bfad_s *bfad, void *cmd, unsigned int v_cmd)
return 0;
}
+int
+bfad_iocmd_fcpim_throttle_query(struct bfad_s *bfad, void *cmd)
+{
+ struct bfa_bsg_fcpim_throttle_s *iocmd =
+ (struct bfa_bsg_fcpim_throttle_s *)cmd;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bfad->bfad_lock, flags);
+ iocmd->status = bfa_fcpim_throttle_get(&bfad->bfa,
+ (void *)&iocmd->throttle);
+ spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+
+ return 0;
+}
+
+int
+bfad_iocmd_fcpim_throttle_set(struct bfad_s *bfad, void *cmd)
+{
+ struct bfa_bsg_fcpim_throttle_s *iocmd =
+ (struct bfa_bsg_fcpim_throttle_s *)cmd;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bfad->bfad_lock, flags);
+ iocmd->status = bfa_fcpim_throttle_set(&bfad->bfa,
+ iocmd->throttle.cfg_value);
+ spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+
+ return 0;
+}
+
static int
bfad_iocmd_handler(struct bfad_s *bfad, unsigned int cmd, void *iocmd,
unsigned int payload_len)
@@ -2881,6 +2911,12 @@ bfad_iocmd_handler(struct bfad_s *bfad, unsigned int cmd, void *iocmd,
case IOCMD_FCPIM_LUNMASK_DELETE:
rc = bfad_iocmd_fcpim_cfg_lunmask(bfad, iocmd, cmd);
break;
+ case IOCMD_FCPIM_THROTTLE_QUERY:
+ rc = bfad_iocmd_fcpim_throttle_query(bfad, iocmd);
+ break;
+ case IOCMD_FCPIM_THROTTLE_SET:
+ rc = bfad_iocmd_fcpim_throttle_set(bfad, iocmd);
+ break;
default:
rc = -EINVAL;
break;