diff options
| author | Krishna Gudipati <kgudipat@brocade.com> | 2012-09-22 04:26:41 +0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-10-07 14:21:29 +0400 |
| commit | 7ace27ae28a5fa67fa3d25f31d1111991c81e015 (patch) | |
| tree | 841612f109ef2b32d15613aa8093d683a6261356 /drivers/scsi/bfa/bfad_bsg.c | |
| parent | 6894f013a71b1bcd09f46b8071f0c6b55fc58139 (diff) | |
| download | linux-7ace27ae28a5fa67fa3d25f31d1111991c81e015.tar.xz | |
[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.c | 36 |
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; |