nvme: add spdk_nvme_ctrlr_get_transport_id()

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Ie32a1bb144c239b923b5cbb9e608a7dfc9c05208

Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/456076
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Maciej Szwed <maciej.szwed@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>

CHANGELOG.md

@@ -24,6 +24,11 @@ The format of the data returned by the get_bdevs_iostat RPC has changed to
 make it easier to parse.  It now returns an object with a "ticks" object
 and "bdevs" array with the per-bdev statistics.
 
+### nvme
+
+Added spdk_nvme_ctrlr_get_transport_id() to get the transport ID from a
+previously attached controller.
+
 ## v19.04:
 
 ### nvme

include/spdk/nvme.h

@@ -1552,6 +1552,15 @@ void *spdk_nvme_ctrlr_alloc_cmb_io_buffer(struct spdk_nvme_ctrlr *ctrlr, size_t
  */
 void spdk_nvme_ctrlr_free_cmb_io_buffer(struct spdk_nvme_ctrlr *ctrlr, void *buf, size_t size);
 
+/**
+ * Get the transport ID for a given NVMe controller.
+ *
+ * \param ctrlr Controller to get the transport ID.
+ * \return Pointer to the controller's transport ID.
+ */
+const struct spdk_nvme_transport_id *spdk_nvme_ctrlr_get_transport_id(
+	struct spdk_nvme_ctrlr *ctrlr);
+
 /**
  * Get the identify namespace data as defined by the NVMe specification.
  *

lib/nvme/nvme_ctrlr.c

@@ -2851,3 +2851,9 @@ spdk_nvme_ctrlr_get_flags(struct spdk_nvme_ctrlr *ctrlr)
 {
 	return ctrlr->flags;
 }
+
+const struct spdk_nvme_transport_id *
+spdk_nvme_ctrlr_get_transport_id(struct spdk_nvme_ctrlr *ctrlr)
+{
+	return &ctrlr->trid;
+}