nvme: expose tls mode in use

It is not possible to determine the active TLS mode from the
presence or absence of sysfs attributes like tls_key,
tls_configured_key, or dhchap_secret.

With the introduction of the concat mode and optional DH-CHAP
authentication, different configurations can result in identical
sysfs state. This makes user space detection unreliable.

Read the TLS mode used from the newly added sysfs entry.

Signed-off-by: Daniel Wagner <[email protected]>

Author: igaw

libnvme/src/nvme/tree.c

@@ -1766,6 +1766,21 @@ static void libnvme_read_sysfs_tls(struct libnvme_global_ctx *ctx,
 	free(key);
 }
 
+static void libnvme_read_sysfs_tls_mode(struct libnvme_global_ctx *ctx,
+		libnvme_ctrl_t c)
+{
+	_cleanup_free_ char *mode = NULL;
+
+	mode = libnvme_get_ctrl_attr(c, "tls_mode");
+	if (!mode)
+		return;
+
+	if (!strcmp(mode, "tls"))
+		c->cfg.tls = true;
+	else if (!strcmp(mode, "concat"))
+		c->cfg.concat = true;
+}
+
 static int libnvme_reconfigure_ctrl(struct libnvme_global_ctx *ctx,
 		libnvme_ctrl_t c, const char *path, const char *name)
 {
@@ -1814,6 +1829,7 @@ static int libnvme_reconfigure_ctrl(struct libnvme_global_ctx *ctx,
 	libnvme_ctrl_lookup_phy_slot(ctx, c);
 	libnvme_read_sysfs_dhchap(ctx, c);
 	libnvme_read_sysfs_tls(ctx, c);
+	libnvme_read_sysfs_tls_mode(ctx, c);
 
 	return 0;
 }