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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: 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>
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2 changed files with 32 additions and 0 deletions
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@ -1899,6 +1899,24 @@ nvme_fc_ctrl_ioerr_work(struct work_struct *work)
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nvme_fc_error_recovery(ctrl, "transport detected io error");
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}
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/*
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* nvme_fc_io_getuuid - Routine called to get the appid field
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* associated with request by the lldd
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* @req:IO request from nvme fc to driver
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* Returns: UUID if there is an appid associated with VM or
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* NULL if the user/libvirt has not set the appid to VM
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*/
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char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req)
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{
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struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req);
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struct request *rq = op->rq;
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if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !rq->bio)
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return NULL;
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return blkcg_get_fc_appid(rq->bio);
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}
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EXPORT_SYMBOL_GPL(nvme_fc_io_getuuid);
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static void
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nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
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{
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@ -564,6 +564,15 @@ int nvme_fc_rcv_ls_req(struct nvme_fc_remote_port *remoteport,
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void *lsreqbuf, u32 lsreqbuf_len);
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/*
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* Routine called to get the appid field associated with request by the lldd
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*
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* If the return value is NULL : the user/libvirt has not set the appid to VM
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* If the return value is non-zero: Returns the appid associated with VM
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*
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* @req: IO request from nvme fc to driver
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*/
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char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req);
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/*
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* *************** LLDD FC-NVME Target/Subsystem API ***************
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@ -1048,5 +1057,10 @@ int nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *tgtport,
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void nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *tgtport,
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struct nvmefc_tgt_fcp_req *fcpreq);
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/*
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* add a define, visible to the compiler, that indicates support
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* for feature. Allows for conditional compilation in LLDDs.
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*/
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#define NVME_FC_FEAT_UUID 0x0001
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#endif /* _NVME_FC_DRIVER_H */
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