Commit 827fc630 authored by Muneendra Kumar's avatar Muneendra Kumar Committed by Martin K. Petersen
Browse files

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

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: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarHimanshu Madhani <himanshu.madhani@oracle.com>
Acked-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMuneendra Kumar <muneendra.kumar@broadcom.com>
Signed-off-by: default avatarJames Smart <jsmart2021@gmail.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 325d5c5f

drivers/nvme/host/fc.c

+18 −0
Original line number Diff line number Diff line
@@ -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)

{

include/linux/nvme-fc-driver.h

+14 −0
Original line number Diff line number Diff line
@@ -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 */