[PATCH v2 1/4] nvme-fc: Add new routine nvme_fc_io_getuuid

[James Smart <jsmart2021@gmail.com>]

From: Muneendra <muneendra.kumar@broadcom.com>

Add nvme_fc_io_getuuid() to the nvme-fc transport.
The routine is invoked by the fc LLDD on a per-io 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.

Signed-off-by: Muneendra Kumar <muneendra.kumar@broadcom.com>
Signed-off-by: James Smart <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>

---
v2: modify to sync with Christoph's patch:
 blk-cgroup: move blkcg_{get,set}_fc_appid out of line
 commit db05628435aa
---
 drivers/nvme/host/fc.c         | 18 ++++++++++++++++++
 include/linux/nvme-fc-driver.h | 14 ++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 080f85f4105f..05f9da251758 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -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)
 {
diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h
index 5358a5facdee..fa092b9be2fd 100644
--- a/include/linux/nvme-fc-driver.h
+++ b/include/linux/nvme-fc-driver.h
@@ -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 */
-- 
2.26.2