zebra: dump label table information

Add the new command "show debugging labeltable" to show allocated label
chunks in the label table managed with label_manager.c

Signed-off-by: Farid Mihoub <farid.mihoub@6wind.com>
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

doc/user/zebra.rst

@@ -783,6 +783,19 @@ presence of the entry.
    21     Static       10.125.0.2  IPv4 Explicit Null
 
 
+Allocated label chunks table can be dumped using the command
+
+.. clicmd:: show debugging label-table
+
+::
+
+   zebra# show debugging label-table
+   Proto ospf: [300/350]
+   Proto srte: [500/500]
+   Proto isis: [1200/1300]
+   Proto ospf: [20000/21000]
+   Proto isis: [22000/23000]
+
 .. _zebra-srv6:
 
 Segment-Routing IPv6

zebra/label_manager.c

@@ -28,6 +28,8 @@
 #include "zebra/zapi_msg.h"
 #include "zebra/debug.h"
 
+#include "zebra/label_manager_clippy.c"
+
 #define CONNECTION_DELAY 5
 
 struct label_manager lbl_mgr;
@@ -145,6 +147,22 @@ void lm_hooks_unregister(void)
 	hook_unregister(lm_release_chunk, label_manager_release_label_chunk);
 }
 
+DEFPY(show_label_table, show_label_table_cmd, "show debugging label-table",
+      SHOW_STR
+      DEBUG_STR
+      "Display allocated label chunks\n")
+{
+	struct label_manager_chunk *lmc;
+	struct listnode *node;
+
+	for (ALL_LIST_ELEMENTS_RO(lbl_mgr.lc_list, node, lmc)) {
+		vty_out(vty, "Proto %s: [%u/%u]\n",
+			zebra_route_string(lmc->proto), lmc->start, lmc->end);
+	}
+
+	return CMD_SUCCESS;
+}
+
 /**
  * Init label manager (or proxy to an external one)
  */
@@ -159,6 +177,8 @@ void label_manager_init(void)
 
 	/* notify any external module that we are done */
 	hook_call(lm_cbs_inited);
+
+	install_element(VIEW_NODE, &show_label_table_cmd);
 }
 
 /* alloc and fill a label chunk */

zebra/subdir.am

@@ -124,6 +124,7 @@ clippy_scan += \
 	zebra/zebra_srv6_vty.c \
 	zebra/zebra_vrf.c \
 	zebra/dpdk/zebra_dplane_dpdk_vty.c \
+	zebra/label_manager.c \
 	# end
 
 noinst_HEADERS += \