bgpd, lib, sharpd: Add enum for zclient_send_message return

Add a `enum zclient_send_status` for appropriate handling
of return codes from zclient_send_message.  Touch all the places
where we handle this.

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

bgpd/bgp_zebra.c

@@ -3050,7 +3050,8 @@ void bgp_send_pbr_rule_action(struct bgp_pbr_action *pbra,
 	bgp_encode_pbr_rule_action(s, pbra, pbr);
 
 	stream_putw_at(s, 0, stream_get_endp(s));
-	if ((zclient_send_message(zclient) != -1) && install) {
+	if ((zclient_send_message(zclient) != ZCLIENT_SEND_FAILURE)
+	    && install) {
 		if (!pbr)
 			pbra->install_in_progress = true;
 		else
@@ -3081,7 +3082,7 @@ void bgp_send_pbr_ipset_match(struct bgp_pbr_match *pbrim, bool install)
 	bgp_encode_pbr_ipset_match(s, pbrim);
 
 	stream_putw_at(s, 0, stream_get_endp(s));
-	if ((zclient_send_message(zclient) != -1) && install)
+	if ((zclient_send_message(zclient) != ZCLIENT_SEND_FAILURE) && install)
 		pbrim->install_in_progress = true;
 }
 
@@ -3109,7 +3110,7 @@ void bgp_send_pbr_ipset_entry_match(struct bgp_pbr_match_entry *pbrime,
 	bgp_encode_pbr_ipset_entry_match(s, pbrime);
 
 	stream_putw_at(s, 0, stream_get_endp(s));
-	if ((zclient_send_message(zclient) != -1) && install)
+	if ((zclient_send_message(zclient) != ZCLIENT_SEND_FAILURE) && install)
 		pbrime->install_in_progress = true;
 }
 
@@ -3184,7 +3185,7 @@ void bgp_send_pbr_iptable(struct bgp_pbr_action *pba,
 	stream_putw_at(s, 0, stream_get_endp(s));
 	ret = zclient_send_message(zclient);
 	if (install) {
-		if (ret != -1)
+		if (ret != ZCLIENT_SEND_FAILURE)
 			pba->refcnt++;
 		else
 			pbm->install_iptable_in_progress = true;

lib/bfd.c

@@ -402,7 +402,7 @@ void bfd_client_sendmsg(struct zclient *zclient, int command,
 			vrf_id_t vrf_id)
 {
 	struct stream *s;
-	int ret;
+	enum zclient_send_status ret;
 
 	/* Check socket. */
 	if (!zclient || zclient->sock < 0) {
@@ -423,7 +423,7 @@ void bfd_client_sendmsg(struct zclient *zclient, int command,
 
 	ret = zclient_send_message(zclient);
 
-	if (ret < 0) {
+	if (ret == ZCLIENT_SEND_FAILURE) {
 		if (bfd_debug)
 			zlog_debug(
 				"bfd_client_sendmsg %ld: zclient_send_message() failed",
@@ -516,7 +516,7 @@ int zclient_bfd_command(struct zclient *zc, struct bfd_session_arg *args)
 	stream_putw_at(s, 0, stream_get_endp(s));
 
 	/* Send message to zebra. */
-	if (zclient_send_message(zc) == -1) {
+	if (zclient_send_message(zc) == ZCLIENT_SEND_FAILURE) {
 		if (bfd_debug)
 			zlog_debug("%s: zclient_send_message failed", __func__);
 		return -1;

lib/zclient.c

@@ -249,12 +249,12 @@ int zclient_socket_connect(struct zclient *zclient)
 	return sock;
 }
 
-static int zclient_failed(struct zclient *zclient)
+static enum zclient_send_status zclient_failed(struct zclient *zclient)
 {
 	zclient->fail++;
 	zclient_stop(zclient);
 	zclient_event(ZCLIENT_CONNECT, zclient);
-	return -1;
+	return ZCLIENT_SEND_FAILURE;
 }
 
 static int zclient_flush_data(struct thread *thread)
@@ -285,14 +285,15 @@ static int zclient_flush_data(struct thread *thread)
 }
 
 /*
- * -1 is a failure
- *  0 means we sent
- *  1 means we are buffering
+ * Returns:
+ * ZCLIENT_SEND_FAILED   - is a failure
+ * ZCLIENT_SEND_SUCCESS  - means we sent data to zebra
+ * ZCLIENT_SEND_BUFFERED - means we are buffering
  */
-int zclient_send_message(struct zclient *zclient)
+enum zclient_send_status zclient_send_message(struct zclient *zclient)
 {
 	if (zclient->sock < 0)
-		return -1;
+		return ZCLIENT_SEND_FAILURE;
 	switch (buffer_write(zclient->wb, zclient->sock,
 			     STREAM_DATA(zclient->obuf),
 			     stream_get_endp(zclient->obuf))) {
@@ -303,17 +304,15 @@ int zclient_send_message(struct zclient *zclient)
 		return zclient_failed(zclient);
 	case BUFFER_EMPTY:
 		THREAD_OFF(zclient->t_write);
-		return 0;
-		break;
+		return ZCLIENT_SEND_SUCCESS;
 	case BUFFER_PENDING:
 		thread_add_write(zclient->master, zclient_flush_data, zclient,
 				 zclient->sock, &zclient->t_write);
-		return 1;
-		break;
+		return ZCLIENT_SEND_BUFFERED;
 	}
 
 	/* should not get here */
-	return 0;
+	return ZCLIENT_SEND_SUCCESS;
 }
 
 /*
@@ -771,11 +770,11 @@ int zclient_send_rnh(struct zclient *zclient, int command,
  *
  * XXX: No attention paid to alignment.
  */
-int zclient_route_send(uint8_t cmd, struct zclient *zclient,
-		       struct zapi_route *api)
+enum zclient_send_status
+zclient_route_send(uint8_t cmd, struct zclient *zclient, struct zapi_route *api)
 {
 	if (zapi_route_encode(cmd, zclient->obuf, api) < 0)
-		return -1;
+		return ZCLIENT_SEND_FAILURE;
 	return zclient_send_message(zclient);
 }
 

lib/zclient.h

@@ -669,6 +669,12 @@ enum zapi_iptable_notify_owner {
 	ZAPI_IPTABLE_FAIL_REMOVE,
 };
 
+enum zclient_send_status {
+	ZCLIENT_SEND_FAILURE = -1,
+	ZCLIENT_SEND_SUCCESS = 0,
+	ZCLIENT_SEND_BUFFERED = 1
+};
+
 static inline const char *
 zapi_rule_notify_owner2str(enum zapi_rule_notify_owner note)
 {
@@ -811,7 +817,7 @@ extern void zclient_redistribute_default(int command, struct zclient *,
  *  0 data was successfully sent
  *  1 data was buffered for future usage
  */
-extern int zclient_send_message(struct zclient *);
+extern enum zclient_send_status zclient_send_message(struct zclient *);
 
 /* create header for command, length to be filled in by user later */
 extern void zclient_create_header(struct stream *, uint16_t, vrf_id_t);
@@ -919,7 +925,8 @@ extern int zebra_send_pw(struct zclient *zclient, int command,
 extern int zebra_read_pw_status_update(ZAPI_CALLBACK_ARGS,
 				       struct zapi_pw_status *pw);
 
-extern int zclient_route_send(uint8_t, struct zclient *, struct zapi_route *);
+extern enum zclient_send_status zclient_route_send(uint8_t, struct zclient *,
+						   struct zapi_route *);
 extern int zclient_send_rnh(struct zclient *zclient, int command,
 			    const struct prefix *p, bool exact_match,
 			    vrf_id_t vrf_id);

ospf6d/ospf6_zebra.c

@@ -328,7 +328,7 @@ static void ospf6_zebra_route_update(int type, struct ospf6_route *request,
 	else
 		ret = zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
 
-	if (ret < 0)
+	if (ret == ZCLIENT_SEND_FAILURE)
 		flog_err(EC_LIB_ZAPI_SOCKET,
 			 "zclient_route_send() %s failed: %s",
 			 (type == REM ? "delete" : "add"),

sharpd/sharp_zebra.c

@@ -289,7 +289,8 @@ static bool route_add(const struct prefix *p, vrf_id_t vrf_id, uint8_t instance,
 		api.backup_nexthop_num = i;
 	}
 
-	if (zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api) == 1)
+	if (zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api)
+	    == ZCLIENT_SEND_BUFFERED)
 		return true;
 	else
 		return false;
@@ -312,7 +313,8 @@ static bool route_delete(struct prefix *p, vrf_id_t vrf_id, uint8_t instance)
 	api.instance = instance;
 	memcpy(&api.prefix, p, sizeof(*p));
 
-	if (zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api) == 1)
+	if (zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api)
+	    == ZCLIENT_SEND_BUFFERED)
 		return true;
 	else
 		return false;
@@ -356,8 +358,6 @@ static void sharp_install_routes_restart(struct prefix *p, uint32_t count,
 			return;
 		}
 	}
-
-	return;
 }
 
 void sharp_install_routes_helper(struct prefix *p, vrf_id_t vrf_id,
@@ -409,8 +409,6 @@ static void sharp_remove_routes_restart(struct prefix *p, uint32_t count,
 			return;
 		}
 	}
-
-	return;
 }
 
 void sharp_remove_routes_helper(struct prefix *p, vrf_id_t vrf_id,
@@ -454,12 +452,10 @@ static void sharp_zclient_buffer_ready(void)
 					     wb.instance, wb.nhgid, wb.nhg,
 					     wb.backup_nhg, wb.routes);
 		return;
-		break;
 	case SHARP_DELETE_ROUTES_RESTART:
 		sharp_remove_routes_restart(&wb.p, wb.count, wb.vrf_id,
 					    wb.instance, wb.routes);
 		return;
-		break;
 	}
 }