nbft: Skip SSNS records pointing to well-known discovery NQN

Depending on a pre-OS implementation, boot attempts pointing
to the well-known discovery NQN may get transformed in
an SSNS record (and marked as 'unavailable') in case
the discovery cannot be performed. Otherwise the NBFT
table should be populated by discovered records instead.

Signed-off-by: Tomas Bzatek <tbzatek@redhat.com>

nbft.c

@@ -335,6 +335,15 @@ int discover_from_nbft(nvme_root_t r, char *hostnqn_arg, char *hostid_arg,
 			for (i = 0; i < (*ss)->num_hfis; i++) {
 				hfi = (*ss)->hfis[i];
 
+				/* Skip discovery NQN records */
+				if (strcmp((*ss)->subsys_nqn, NVME_DISC_SUBSYS_NAME) == 0) {
+					if (verbose >= 1)
+						fprintf(stderr,
+							"SSNS %d points to well-known discovery NQN, skipping\n",
+							(*ss)->index);
+					continue;
+				}
+
 				host_traddr = NULL;
 				if (!cfg->host_traddr &&
 				    !strncmp((*ss)->transport, "tcp", 3))