1 files changed, 89 insertions, 0 deletions
diff --git a/examples/discover-loop.c b/examples/discover-loop.c
new file mode 100644
index 0000000..a577cd4
--- /dev/null
+++ b/examples/discover-loop.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/**
+ * This file is part of libnvme.
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors: Keith Busch <keith.busch@wdc.com>
+ */
+
+/**
+ * discover-loop: Use fabrics commands to discover any loop targets and print
+ * those records. You must have at least one configured nvme loop target on the
+ * system (no existing connection required). The output will look more
+ * interesting with more targets.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <libnvme.h>
+
+#include <ccan/endian/endian.h>
+
+static void print_discover_log(struct nvmf_discovery_log *log)
+{
+	int i, numrec = le64_to_cpu(log->numrec);
+
+	printf(".\n");
+	printf("|-- genctr:%llx\n", log->genctr);
+	printf("|-- numrec:%x\n", numrec);
+	printf("`-- recfmt:%x\n", log->recfmt);
+
+	for (i = 0; i < numrec; i++) {
+		struct nvmf_disc_log_entry *e = &log->entries[i];
+
+		printf("  %c-- Entry:%d\n", (i < numrec - 1) ? '|' : '`', i);
+		printf("  %c   |-- trtype:%x\n", (i < numrec - 1) ? '|' : ' ', e->trtype);
+		printf("  %c   |-- adrfam:%x\n", (i < numrec - 1) ? '|' : ' ', e->adrfam);
+		printf("  %c   |-- subtype:%x\n", (i < numrec - 1) ? '|' : ' ', e->subtype);
+		printf("  %c   |-- treq:%x\n", (i < numrec - 1) ? '|' : ' ', e->treq);
+		printf("  %c   |-- portid:%x\n", (i < numrec - 1) ? '|' : ' ', e->portid);
+		printf("  %c   |-- cntlid:%x\n", (i < numrec - 1) ? '|' : ' ', e->cntlid);
+		printf("  %c   |-- asqsz:%x\n", (i < numrec - 1) ? '|' : ' ', e->asqsz);
+		printf("  %c   |-- trsvcid:%s\n", (i < numrec - 1) ? '|' : ' ', e->trsvcid);
+		printf("  %c   |-- subnqn:%s\n", (i < numrec - 1) ? '|' : ' ', e->subnqn);
+		printf("  %c   `-- traddr:%s\n", (i < numrec - 1) ? '|' : ' ', e->traddr);
+	}
+}
+
+int main()
+{
+	struct nvmf_discovery_log *log = NULL;
+	nvme_root_t r;
+	nvme_host_t h;
+	nvme_ctrl_t c;
+	int ret;
+	struct nvme_fabrics_config cfg;
+
+	nvmf_default_config(&cfg);
+
+	r = nvme_scan(NULL);
+	h = nvme_default_host(r);
+	if (!h) {
+		fprintf(stderr, "Failed to allocated memory\n");
+		return ENOMEM;
+	}
+	c = nvme_create_ctrl(r, NVME_DISC_SUBSYS_NAME, "loop",
+			     NULL, NULL, NULL, NULL);
+	if (!c) {
+		fprintf(stderr, "Failed to allocate memory\n");
+		return ENOMEM;
+	}
+	ret = nvmf_add_ctrl(h, c, &cfg);
+	if (ret < 0) {
+		fprintf(stderr, "no controller found\n");
+		return errno;
+	}
+
+	ret = nvmf_get_discovery_log(c, &log, 4);
+	nvme_disconnect_ctrl(c);
+	nvme_free_ctrl(c);
+
+	if (ret)
+		fprintf(stderr, "nvmf-discover-log:%x\n", ret);
+	else
+		print_discover_log(log);
+
+	nvme_free_tree(r);
+	return 0;
+}