bgpd: BGP_ERR_MULTIPLE_INSTANCE_NOT_SET is an impossible condition

This code is not returned anywhere in the system as that bgp
is by default multiple-instance 'only' now.  So remove
the last remaining bits of it from the code base.

Remove BGP_ERR_MULTIPLE_INSTANCE_USED too.

Make bgp_get explicitly return BGP_SUCCESS
instead of 0.

Remove the multi-instance error code too.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

6 files changed, 2 insertions, 19 deletions

diff --git a/bgpd/bgp_errors.c b/bgpd/bgp_errors.c
index 6e181697d6..d9aba87e35 100644
--- a/bgpd/bgp_errors.c
+++ b/bgpd/bgp_errors.c
@@ -427,12 +427,6 @@ static struct log_ref ferr_bgp_err[] = {
 		.suggestion = "Most likely a bug. If the problem persists, report the problem for troubleshooting"
 	},
 	{
-		.code = EC_BGP_MULTI_INSTANCE,
-		.title = "BGP config multi-instance issue",
-		.description = "BGP configuration attempting multiple instances without enabling the feature",
-		.suggestion = "Correct the configuration so that bgp multiple-instance is enabled if desired"
-	},
-	{
 		.code = EC_BGP_EVPN_AS_MISMATCH,
 		.title = "BGP AS configuration issue",
 		.description = "BGP configuration attempted for a different AS than currently configured",
diff --git a/bgpd/bgp_errors.h b/bgpd/bgp_errors.h
index 39d043ff13..35c5cc3998 100644
--- a/bgpd/bgp_errors.h
+++ b/bgpd/bgp_errors.h
@@ -67,7 +67,6 @@ enum bgp_log_refs {
 	EC_BGP_EVPN_ROUTE_INVALID,
 	EC_BGP_EVPN_ROUTE_CREATE,
 	EC_BGP_ES_CREATE,
-	EC_BGP_MULTI_INSTANCE,
 	EC_BGP_EVPN_AS_MISMATCH,
 	EC_BGP_EVPN_INSTANCE_MISMATCH,
 	EC_BGP_FLOWSPEC_PACKET,
diff --git a/bgpd/bgp_evpn.c b/bgpd/bgp_evpn.c
index c4b2a606c5..94022ec1be 100644
--- a/bgpd/bgp_evpn.c
+++ b/bgpd/bgp_evpn.c
@@ -5533,10 +5533,6 @@ int bgp_evpn_local_l3vni_add(vni_t l3vni, vrf_id_t vrf_id, struct ethaddr *rmac,
 			      vrf_id == VRF_DEFAULT ? BGP_INSTANCE_TYPE_DEFAULT
 						    : BGP_INSTANCE_TYPE_VRF);
 		switch (ret) {
-		case BGP_ERR_MULTIPLE_INSTANCE_NOT_SET:
-			flog_err(EC_BGP_MULTI_INSTANCE,
-				 "'bgp multiple-instance' not present\n");
-			return -1;
 		case BGP_ERR_AS_MISMATCH:
 			flog_err(EC_BGP_EVPN_AS_MISMATCH,
 				 "BGP is already running; AS is %u\n", as);
diff --git a/bgpd/bgp_vty.c b/bgpd/bgp_vty.c
index a18a3bb952..6cbb9af50e 100644
--- a/bgpd/bgp_vty.c
+++ b/bgpd/bgp_vty.c
@@ -979,10 +979,6 @@ DEFUN_NOSH (router_bgp,
 
 		ret = bgp_get(&bgp, &as, name, inst_type);
 		switch (ret) {
-		case BGP_ERR_MULTIPLE_INSTANCE_NOT_SET:
-			vty_out(vty,
-				"Please specify 'bgp multiple-instance' first\n");
-			return CMD_WARNING_CONFIG_FAILED;
 		case BGP_ERR_AS_MISMATCH:
 			vty_out(vty, "BGP is already running; AS is %u\n", as);
 			return CMD_WARNING_CONFIG_FAILED;
diff --git a/bgpd/bgpd.c b/bgpd/bgpd.c
index af90e9841a..3ca209676f 100644
--- a/bgpd/bgpd.c
+++ b/bgpd/bgpd.c
@@ -3183,7 +3183,7 @@ int bgp_get(struct bgp **bgp_val, as_t *as, const char *name,
 		if (bgp->inst_type != inst_type)
 			return BGP_ERR_INSTANCE_MISMATCH;
 		*bgp_val = bgp;
-		return 0;
+		return BGP_SUCCESS;
 	}
 
 	bgp = bgp_create(as, name, inst_type);
@@ -3217,7 +3217,7 @@ int bgp_get(struct bgp **bgp_val, as_t *as, const char *name,
 		bgp_zebra_instance_register(bgp);
 	}
 
-	return 0;
+	return BGP_SUCCESS;
 }
 
 /*
diff --git a/bgpd/bgpd.h b/bgpd/bgpd.h
index 088c6411b4..4bce73898f 100644
--- a/bgpd/bgpd.h
+++ b/bgpd/bgpd.h
@@ -1453,12 +1453,10 @@ enum bgp_clear_type {
 #define BGP_ERR_INVALID_AS                       -3
 #define BGP_ERR_INVALID_BGP                      -4
 #define BGP_ERR_PEER_GROUP_MEMBER                -5
-#define BGP_ERR_MULTIPLE_INSTANCE_USED           -6
 #define BGP_ERR_PEER_GROUP_NO_REMOTE_AS          -7
 #define BGP_ERR_PEER_GROUP_CANT_CHANGE           -8
 #define BGP_ERR_PEER_GROUP_MISMATCH              -9
 #define BGP_ERR_PEER_GROUP_PEER_TYPE_DIFFERENT  -10
-#define BGP_ERR_MULTIPLE_INSTANCE_NOT_SET       -11
 #define BGP_ERR_AS_MISMATCH                     -12
 #define BGP_ERR_PEER_FLAG_CONFLICT              -13
 #define BGP_ERR_PEER_GROUP_SHUTDOWN             -14