nvme: add spdk_nvme_ctrlr_is_fabrics()

We map the SPDK_NVME_TRANSPORT_* values directly to
the NVMe-oF trtype values.  Since PCIe isn't
Fabrics, we choose 256 which is outside of the
8-bit trtype range of values.

So we can just check if trtype >= 256 to determine
if the trid is for fabrics or not.  This is
preferable to checking PCIE || VFIOUSER in case
additional non-fabrics transport types are added
in the future.

I considered taking a trid as the parameter instead,
but went this route since it is consistent with
the existing spdk_nvme_ctrlr_is_discovery().

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Ib62ff4d30549b2324486c81f2dce67f0f1741e9b
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/8077
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Ziye Yang <ziye.yang@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>

include/spdk/nvme.h

@@ -297,6 +297,15 @@ struct spdk_nvme_accel_fn_table {
  */
 bool spdk_nvme_ctrlr_is_discovery(struct spdk_nvme_ctrlr *ctrlr);
 
+/**
+ * Indicate whether a ctrlr handle is associated with a fabrics controller.
+ *
+ * \param ctrlr Opaque handle to NVMe controller.
+ *
+ * \return true if a fabrics controller, else false.
+ */
+bool spdk_nvme_ctrlr_is_fabrics(struct spdk_nvme_ctrlr *ctrlr);
+
 /**
  * Get the default options for the creation of a specific NVMe controller.
  *

lib/nvme/nvme_ctrlr.c

@@ -4230,6 +4230,17 @@ spdk_nvme_ctrlr_is_discovery(struct spdk_nvme_ctrlr *ctrlr)
 			strlen(SPDK_NVMF_DISCOVERY_NQN));
 }
 
+bool
+spdk_nvme_ctrlr_is_fabrics(struct spdk_nvme_ctrlr *ctrlr)
+{
+	assert(ctrlr);
+
+	/* We always define non-fabrics trtypes outside of the 8-bit range
+	 * of NVMe-oF trtype.
+	 */
+	return ctrlr->trid.trtype < UINT8_MAX;
+}
+
 int
 spdk_nvme_ctrlr_security_receive(struct spdk_nvme_ctrlr *ctrlr, uint8_t secp,
 				 uint16_t spsp, uint8_t nssf, void *payload, size_t size)

lib/nvme/spdk_nvme.map

@@ -30,6 +30,7 @@
 	spdk_nvme_pcie_set_hotplug_filter;
 
 	spdk_nvme_ctrlr_is_discovery;
+	spdk_nvme_ctrlr_is_fabrics;
 	spdk_nvme_ctrlr_get_default_ctrlr_opts;
 	spdk_nvme_ctrlr_set_trid;
 	spdk_nvme_ctrlr_reset_subsystem;