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scsi: nvme-fc: Add new routine nvme_fc_io_getuuid()

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Add nvme_fc_io_getuuid() to the nvme-fc transport. The routine is invoked
by the FC LLDD on a per-I/O request basis.  The routine translates from the
FC-specific request structure to the bio and the cgroup structure in order
to obtain the FC appid stored in the cgroup structure. If a value is not
set or a bio is not found, a NULL appid (aka uuid) will be returned to the
LLDD.

Link: https://lore.kernel.org/r/20220519123110.17361-2-jsmart2021@gmail.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Muneendra Kumar <muneendra.kumar@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Muneendra Kumar 2022-05-19 05:31:07 -07:00 committed by Martin K. Petersen
parent 325d5c5fb2
commit 827fc630e4
2 changed files with 32 additions and 0 deletions
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18
drivers/nvme/host/fc.c
View file

@ -1899,6 +1899,24 @@ nvme_fc_ctrl_ioerr_work(struct work_struct *work)
nvme_fc_error_recovery(ctrl, "transport detected io error");
}
/*
* nvme_fc_io_getuuid - Routine called to get the appid field
* associated with request by the lldd
* @req:IO request from nvme fc to driver
* Returns: UUID if there is an appid associated with VM or
* NULL if the user/libvirt has not set the appid to VM
*/
char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req)
{
struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req);
struct request *rq = op->rq;
if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !rq->bio)
return NULL;
return blkcg_get_fc_appid(rq->bio);
}
EXPORT_SYMBOL_GPL(nvme_fc_io_getuuid);
static void
nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
{

14
include/linux/nvme-fc-driver.h
View file

@ -564,6 +564,15 @@ int nvme_fc_rcv_ls_req(struct nvme_fc_remote_port *remoteport,
void *lsreqbuf, u32 lsreqbuf_len);
/*
* Routine called to get the appid field associated with request by the lldd
*
* If the return value is NULL : the user/libvirt has not set the appid to VM
* If the return value is non-zero: Returns the appid associated with VM
*
* @req: IO request from nvme fc to driver
*/
char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req);
/*
* *************** LLDD FC-NVME Target/Subsystem API ***************
@ -1048,5 +1057,10 @@ int nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *tgtport,
void nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
/*
* add a define, visible to the compiler, that indicates support
* for feature. Allows for conditional compilation in LLDDs.
*/
#define NVME_FC_FEAT_UUID 0x0001
#endif /* _NVME_FC_DRIVER_H */