vrf: VRF_DEFAULT must be 0, remove useless code

Code was added in the past to support a value of VRF_DEFAULT different
from 0. This option was abandoned, the default vrf id is always 0.

Remove this code, this will simplify the code and improve performance
(use a constant value instead of a function that performs tests).

Signed-off-by: Christophe Gouault <christophe.gouault@6wind.com>

lib/netns_linux.c

@@ -43,9 +43,6 @@
 DEFINE_MTYPE_STATIC(LIB, NS, "NetNS Context")
 DEFINE_MTYPE_STATIC(LIB, NS_NAME, "NetNS Name")
 
-/* default NS ID value used when VRF backend is not NETNS */
-#define NS_DEFAULT_INTERNAL 0
-
 static inline int ns_compare(const struct ns *ns, const struct ns *ns2);
 static struct ns *ns_lookup_name_internal(const char *name);
 
@@ -101,9 +98,6 @@ static inline int setns(int fd, int nstype)
 static int have_netns_enabled = -1;
 #endif /* HAVE_NETNS */
 
-/* default NS ID value used when VRF backend is not NETNS */
-#define NS_DEFAULT_INTERNAL 0
-
 static int have_netns(void)
 {
 #ifdef HAVE_NETNS
@@ -612,15 +606,7 @@ ns_id_t ns_id_get_absolute(ns_id_t ns_id_reference, ns_id_t link_nsid)
 	return ns->ns_id;
 }
 
-ns_id_t ns_get_default_id(void)
-{
-	if (default_ns)
-		return default_ns->ns_id;
-	return NS_DEFAULT_INTERNAL;
-}
-
 struct ns *ns_get_default(void)
 {
 	return default_ns;
 }
-

lib/netns_other.c

@@ -110,13 +110,6 @@ void ns_init(void)
 {
 }
 
-/* API to retrieve default NS */
-ns_id_t ns_get_default_id(void)
-{
-	return NS_UNKNOWN;
-}
-
-
 /* API that can be used to change from NS */
 int ns_switchback_to_initial(void)
 {

lib/ns.h

@@ -161,10 +161,7 @@ extern ns_id_t ns_map_nsid_with_external(ns_id_t ns_id, bool map);
  */
 extern void ns_init(void);
 
-/* API to retrieve default NS */
-extern ns_id_t ns_get_default_id(void);
-
-#define NS_DEFAULT ns_get_default_id()
+#define NS_DEFAULT 0
 
 /* API that can be used to change from NS */
 extern int ns_switchback_to_initial(void);

lib/vrf.c

@@ -39,8 +39,7 @@
 #include "northbound.h"
 #include "northbound_cli.h"
 
-/* default VRF ID value used when VRF backend is not NETNS */
-#define VRF_DEFAULT_INTERNAL 0
+/* default VRF name value used when VRF backend is not NETNS */
 #define VRF_DEFAULT_NAME_INTERNAL "default"
 
 DEFINE_MTYPE_STATIC(LIB, VRF, "VRF")
@@ -521,7 +520,7 @@ void vrf_init(int (*create)(struct vrf *), int (*enable)(struct vrf *),
 
 		strlcpy(default_vrf->data.l.netns_name,
 			VRF_DEFAULT_NAME, NS_NAMSIZ);
-		ns = ns_lookup(ns_get_default_id());
+		ns = ns_lookup(NS_DEFAULT);
 		ns->vrf_ctxt = default_vrf;
 		default_vrf->ns_ctxt = ns;
 	}
@@ -949,17 +948,6 @@ const char *vrf_get_default_name(void)
 	return vrf_default_name;
 }
 
-vrf_id_t vrf_get_default_id(void)
-{
-	/* backend netns is only known by zebra
-	 * for other daemons, we return VRF_DEFAULT_INTERNAL
-	 */
-	if (vrf_is_backend_netns())
-		return ns_get_default_id();
-	else
-		return VRF_DEFAULT_INTERNAL;
-}
-
 int vrf_bind(vrf_id_t vrf_id, int fd, const char *name)
 {
 	int ret = 0;

lib/vrf.h

@@ -262,12 +262,8 @@ extern int vrf_getaddrinfo(const char *node, const char *service,
 
 extern int vrf_ioctl(vrf_id_t vrf_id, int d, unsigned long request, char *args);
 
-/* function called by macro VRF_DEFAULT
- * to get the default VRF_ID
- */
-extern vrf_id_t vrf_get_default_id(void);
 /* The default VRF ID */
-#define VRF_DEFAULT vrf_get_default_id()
+#define VRF_DEFAULT 0
 
 extern void vrf_set_default_name(const char *default_name, bool force);
 extern const char *vrf_get_default_name(void);

zebra/zebra_netns_id.c

@@ -39,9 +39,6 @@
 #include "zebra/zebra_netns_id.h"
 #include "zebra/zebra_errors.h"
 
-/* default NS ID value used when VRF backend is not NETNS */
-#define NS_DEFAULT_INTERNAL 0
-
 /* in case NEWNSID not available, the NSID will be locally obtained
  */
 #define NS_BASE_NSID 0
@@ -362,14 +359,14 @@ ns_id_t zebra_ns_id_get_default(void)
 	fd = open(NS_DEFAULT_NAME, O_RDONLY);
 
 	if (fd == -1)
-		return NS_DEFAULT_INTERNAL;
+		return NS_DEFAULT;
 	if (!vrf_is_backend_netns()) {
 		close(fd);
-		return NS_DEFAULT_INTERNAL;
+		return NS_DEFAULT;
 	}
 	close(fd);
 	return zebra_ns_id_get((char *)NS_DEFAULT_NAME, -1);
 #else  /* HAVE_NETNS */
-	return NS_DEFAULT_INTERNAL;
+	return NS_DEFAULT;
 #endif /* !HAVE_NETNS */
 }

zebra/zebra_ns.c

@@ -199,7 +199,7 @@ int zebra_ns_init(const char *optional_default_name)
 	if (ns)
 		ns->relative_default_ns = ns_id;
 
-	default_ns = ns_lookup(ns_get_default_id());
+	default_ns = ns_lookup(NS_DEFAULT);
 	if (!default_ns) {
 		flog_err(EC_ZEBRA_NS_NO_DEFAULT,
 			 "%s: failed to find default ns", __func__);