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| author | James Smart <jsmart2021@gmail.com> | 2017-12-09 04:18:03 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-12-21 05:11:44 +0300 |
| commit | cf1a1d3e2d88af49472014db0c82779b4fe85455 (patch) | |
| tree | 29cd2919b5dd43d116ccc6290f94bcb4ea2b6c3c /drivers/scsi/lpfc/lpfc_nvme.h | |
| parent | 4d0951ee70d348b694ce2bbdcc65b684239da4b4 (diff) | |
| download | linux-cf1a1d3e2d88af49472014db0c82779b4fe85455.tar.xz | |
scsi: lpfc: Fix random heartbeat timeouts during heavy IO
NVME targets appear to randomly disconnect from the initiator when
running heavy IO.
The error is due to the host aggregate (across all controllers) io load
was beyond the maximum exchange count for nvme on the adapter. The
driver was properly returning a resource busy status, but the io load
was so great heartbeat commands would be bounced and not have a
successful retry within the fuzz amount for the nvme heartbeat (yes, a
very high io load!). Thus the target was terminating the controller due
to a keep alive failure.
Resolve by reserving a few exchanges (by counters) which can be used
when the adapter is out of normal exchanges and the command is a NVME
heartbeat command. As counters are used, while the reserved command is
outstanding, as soon as any other exchange completes, the counters are
adjusted and the reserved count is replenished. The heartbeat completes
execution in a normal fashion.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_nvme.h')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_nvme.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_nvme.h b/drivers/scsi/lpfc/lpfc_nvme.h index 903ec37f465f..c0833e469b7c 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.h +++ b/drivers/scsi/lpfc/lpfc_nvme.h @@ -28,6 +28,7 @@ #define LPFC_NVME_ERSP_LEN 0x20 #define LPFC_NVME_WAIT_TMO 10 +#define LPFC_NVME_EXPEDITE_XRICNT 8 struct lpfc_nvme_qhandle { uint32_t index; /* WQ index to use */ |