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| author | James Smart <jsmart2021@gmail.com> | 2018-02-22 08:18:50 -0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-02-22 20:39:29 -0500 |
| commit | 4e565cf04138fca6ffeb884044febf922b2306d0 (patch) | |
| tree | f3a195ce30d8447824e800ee437b539535c5d6fb /drivers/scsi/lpfc/lpfc.h | |
| parent | 63452e144662a90b77fcdb27bd33c8b43655b850 (diff) | |
| download | lwn-4e565cf04138fca6ffeb884044febf922b2306d0.tar.gz lwn-4e565cf04138fca6ffeb884044febf922b2306d0.zip | |
scsi: lpfc: Work around NVME cmd iu SGL type
The hardware offload for NVME commands was created when the
FC-NVME standard was setting SGL Descriptor Type to SGL Data
Block Descriptor (0h) and SGL Descriptor Sub Type to Address (0h).
A late change in NVMe-over-Fabrics obsoleted these values, creating
a transport SGL descriptor type with new values to go into these
fields.
For initial hardware support, in order to be compliant to the spec,
use host-supplied cmd IU buffers instead of the adapter generated
values. Later hardware will correct this.
Add a module parameter to override this offload disablement if looking
for lowest latency. This is reasonable as nothing in FC-NVME uses
the SQE SGL values.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc.h')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h index 9136a59b1c5b..6c0d351c0d0d 100644 --- a/drivers/scsi/lpfc/lpfc.h +++ b/drivers/scsi/lpfc/lpfc.h @@ -782,6 +782,7 @@ struct lpfc_hba { uint32_t cfg_fcp_io_channel; uint32_t cfg_suppress_rsp; uint32_t cfg_nvme_oas; + uint32_t cfg_nvme_embed_cmd; uint32_t cfg_nvme_io_channel; uint32_t cfg_nvmet_mrq; uint32_t cfg_enable_nvmet; |