isisd: retrofit the 'lsp-mtu' command

Signed-off-by: Emanuele Di Pascale <emanuele@voltanet.io>

isisd/isis_cli.c

@@ -735,6 +735,34 @@ void cli_show_isis_lsp_max_lifetime(struct vty *vty, struct lyd_node *dnode,
 	}
 }
 
+/*
+ * XPath: /frr-isisd:isis/instance/lsp/mtu
+ */
+DEFPY(area_lsp_mtu, area_lsp_mtu_cmd, "lsp-mtu (128-4352)$val",
+      "Configure the maximum size of generated LSPs\n"
+      "Maximum size of generated LSPs\n")
+{
+	nb_cli_enqueue_change(vty, "./lsp/mtu", NB_OP_MODIFY, val_str);
+
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY(no_area_lsp_mtu, no_area_lsp_mtu_cmd, "no lsp-mtu [(128-4352)]",
+      NO_STR
+      "Configure the maximum size of generated LSPs\n"
+      "Maximum size of generated LSPs\n")
+{
+	nb_cli_enqueue_change(vty, "./lsp/mtu", NB_OP_MODIFY, NULL);
+
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+void cli_show_isis_lsp_mtu(struct vty *vty, struct lyd_node *dnode,
+			   bool show_defaults)
+{
+	vty_out(vty, " lsp-mtu %s\n", yang_dnode_get_string(dnode, NULL));
+}
+
 void isis_cli_init(void)
 {
 	install_element(CONFIG_NODE, &router_isis_cmd);
@@ -767,6 +795,8 @@ void isis_cli_init(void)
 	install_element(ISIS_NODE, &no_lsp_refresh_interval_cmd);
 	install_element(ISIS_NODE, &max_lsp_lifetime_cmd);
 	install_element(ISIS_NODE, &no_max_lsp_lifetime_cmd);
+	install_element(ISIS_NODE, &area_lsp_mtu_cmd);
+	install_element(ISIS_NODE, &no_area_lsp_mtu_cmd);
 }
 
 #endif /* ifndef FABRICD */

isisd/isis_cli.h

@@ -49,5 +49,7 @@ void cli_show_isis_lsp_ref_interval(struct vty *vty, struct lyd_node *dnode,
 				    bool show_defaults);
 void cli_show_isis_lsp_max_lifetime(struct vty *vty, struct lyd_node *dnode,
 				    bool show_defaults);
+void cli_show_isis_lsp_mtu(struct vty *vty, struct lyd_node *dnode,
+			   bool show_defaults);
 
 #endif /* ISISD_ISIS_CLI_H_ */

isisd/isis_northbound.c

@@ -361,7 +361,39 @@ static int isis_instance_lsp_mtu_modify(enum nb_event event,
 					const struct lyd_node *dnode,
 					union nb_resource *resource)
 {
-	/* TODO: implement me. */
+	struct listnode *node;
+	struct isis_circuit *circuit;
+	uint16_t lsp_mtu = yang_dnode_get_uint16(dnode, NULL);
+	struct isis_area *area;
+
+	switch (event) {
+	case NB_EV_VALIDATE:
+		area = yang_dnode_get_entry(dnode, false);
+		if (!area)
+			break;
+		for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit)) {
+			if (circuit->state != C_STATE_INIT
+			    && circuit->state != C_STATE_UP)
+				continue;
+			if (lsp_mtu > isis_circuit_pdu_size(circuit)) {
+				flog_warn(
+					EC_LIB_NB_CB_CONFIG_VALIDATE,
+					"ISIS area contains circuit %s, which has a maximum PDU size of %zu",
+					circuit->interface->name,
+					isis_circuit_pdu_size(circuit));
+				return NB_ERR_VALIDATION;
+			}
+		}
+		break;
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		area = yang_dnode_get_entry(dnode, true);
+		isis_area_lsp_mtu_set(area, lsp_mtu);
+		break;
+	}
+
 	return NB_OK;
 }
 
@@ -1898,6 +1930,7 @@ const struct frr_yang_module_info frr_isisd_info = {
 		{
 			.xpath = "/frr-isisd:isis/instance/lsp/mtu",
 			.cbs.modify = isis_instance_lsp_mtu_modify,
+			.cbs.cli_show = cli_show_isis_lsp_mtu,
 		},
 		{
 			.xpath = "/frr-isisd:isis/instance/lsp/refresh-interval",

isisd/isis_vty_common.c

@@ -440,53 +440,6 @@ DEFUN (no_isis_bfd,
 	return CMD_SUCCESS;
 }
 
-static int isis_vty_lsp_mtu_set(struct vty *vty, unsigned int lsp_mtu)
-{
-	VTY_DECLVAR_CONTEXT(isis_area, area);
-	struct listnode *node;
-	struct isis_circuit *circuit;
-
-	for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit)) {
-		if (circuit->state != C_STATE_INIT
-		    && circuit->state != C_STATE_UP)
-			continue;
-		if (lsp_mtu > isis_circuit_pdu_size(circuit)) {
-			vty_out(vty,
-				"ISIS area contains circuit %s, which has a maximum PDU size of %zu.\n",
-				circuit->interface->name,
-				isis_circuit_pdu_size(circuit));
-			return CMD_WARNING_CONFIG_FAILED;
-		}
-	}
-
-	isis_area_lsp_mtu_set(area, lsp_mtu);
-	return CMD_SUCCESS;
-}
-
-DEFUN (area_lsp_mtu,
-       area_lsp_mtu_cmd,
-       "lsp-mtu (128-4352)",
-       "Configure the maximum size of generated LSPs\n"
-       "Maximum size of generated LSPs\n")
-{
-	int idx_number = 1;
-	unsigned int lsp_mtu;
-
-	lsp_mtu = strtoul(argv[idx_number]->arg, NULL, 10);
-
-	return isis_vty_lsp_mtu_set(vty, lsp_mtu);
-}
-
-DEFUN (no_area_lsp_mtu,
-       no_area_lsp_mtu_cmd,
-       "no lsp-mtu [(128-4352)]",
-       NO_STR
-       "Configure the maximum size of generated LSPs\n"
-       "Maximum size of generated LSPs\n")
-{
-	return isis_vty_lsp_mtu_set(vty, DEFAULT_LSP_MTU);
-}
-
 DEFUN (area_purge_originator,
        area_purge_originator_cmd,
        "[no] purge-originator",
@@ -616,9 +569,6 @@ void isis_vty_init(void)
 	install_element(INTERFACE_NODE, &isis_bfd_cmd);
 	install_element(INTERFACE_NODE, &no_isis_bfd_cmd);
 
-	install_element(ROUTER_NODE, &area_lsp_mtu_cmd);
-	install_element(ROUTER_NODE, &no_area_lsp_mtu_cmd);
-
 	install_element(ROUTER_NODE, &area_purge_originator_cmd);
 
 	install_element(ROUTER_NODE, &spf_interval_cmd);

isisd/isis_vty_fabricd.c

@@ -544,6 +544,54 @@ DEFUN (no_max_lsp_lifetime,
 					     DEFAULT_LSP_LIFETIME);
 }
 
+
+static int isis_vty_lsp_mtu_set(struct vty *vty, unsigned int lsp_mtu)
+{
+	VTY_DECLVAR_CONTEXT(isis_area, area);
+	struct listnode *node;
+	struct isis_circuit *circuit;
+
+	for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit)) {
+		if (circuit->state != C_STATE_INIT
+		    && circuit->state != C_STATE_UP)
+			continue;
+		if (lsp_mtu > isis_circuit_pdu_size(circuit)) {
+			vty_out(vty,
+				"ISIS area contains circuit %s, which has a maximum PDU size of %zu.\n",
+				circuit->interface->name,
+				isis_circuit_pdu_size(circuit));
+			return CMD_WARNING_CONFIG_FAILED;
+		}
+	}
+
+	isis_area_lsp_mtu_set(area, lsp_mtu);
+	return CMD_SUCCESS;
+}
+
+DEFUN (area_lsp_mtu,
+       area_lsp_mtu_cmd,
+       "lsp-mtu (128-4352)",
+       "Configure the maximum size of generated LSPs\n"
+       "Maximum size of generated LSPs\n")
+{
+	int idx_number = 1;
+	unsigned int lsp_mtu;
+
+	lsp_mtu = strtoul(argv[idx_number]->arg, NULL, 10);
+
+	return isis_vty_lsp_mtu_set(vty, lsp_mtu);
+}
+
+DEFUN (no_area_lsp_mtu,
+       no_area_lsp_mtu_cmd,
+       "no lsp-mtu [(128-4352)]",
+       NO_STR
+       "Configure the maximum size of generated LSPs\n"
+       "Maximum size of generated LSPs\n")
+{
+	return isis_vty_lsp_mtu_set(vty, DEFAULT_LSP_MTU);
+}
+
 void isis_vty_daemon_init(void)
 {
 	install_element(ROUTER_NODE, &fabric_tier_cmd);
@@ -571,4 +619,7 @@ void isis_vty_daemon_init(void)
 
 	install_element(ROUTER_NODE, &max_lsp_lifetime_cmd);
 	install_element(ROUTER_NODE, &no_max_lsp_lifetime_cmd);
+
+	install_element(ROUTER_NODE, &area_lsp_mtu_cmd);
+	install_element(ROUTER_NODE, &no_area_lsp_mtu_cmd);
 }