NAT64: change not supported multi threading behaviour

Disable CLI/API commands instead of error message on startup.

Change-Id: I313ed6e2ea009f573afb5e08b0e85ed1f9091dc3
Signed-off-by: Matus Fabian <matfabia@cisco.com>

5 files changed, 104 insertions, 6 deletions

diff --git a/src/plugins/snat/nat64.c b/src/plugins/snat/nat64.c
index 1e8b75967d8..d6e052f106d 100644
--- a/src/plugins/snat/nat64.c
+++ b/src/plugins/snat/nat64.c
@@ -47,9 +47,11 @@ nat64_init (vlib_main_t * vm)
   clib_error_t *error = 0;
   vlib_thread_main_t *tm = vlib_get_thread_main ();
 
+  nm->is_disabled = 0;
+
   if (tm->n_vlib_mains > 1)
     {
-      error = clib_error_return (0, "multi thread not supported");
+      nm->is_disabled = 1;
       goto error;
     }
 
@@ -609,7 +611,7 @@ nat64_expire_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
 {
   nat64_main_t *nm = &nat64_main;
 
-  while (1)
+  while (!nm->is_disabled)
     {
       vlib_process_wait_for_event_or_clock (vm, 10.0);
       vlib_process_get_events (vm, NULL);
diff --git a/src/plugins/snat/nat64.h b/src/plugins/snat/nat64.h
index 429b8c0ccc1..df0c470ab1f 100644
--- a/src/plugins/snat/nat64.h
+++ b/src/plugins/snat/nat64.h
@@ -57,6 +57,8 @@ typedef struct
   u32 tcp_est_timeout;
   u32 tcp_incoming_syn_timeout;
 
+  u8 is_disabled;
+
   snat_main_t *sm;
 } nat64_main_t;
 
diff --git a/src/plugins/snat/nat64_cli.c b/src/plugins/snat/nat64_cli.c
index e2e3533849f..293ceaf5efb 100644
--- a/src/plugins/snat/nat64_cli.c
+++ b/src/plugins/snat/nat64_cli.c
@@ -26,6 +26,7 @@ nat64_add_del_pool_addr_command_fn (vlib_main_t * vm,
 				    unformat_input_t * input,
 				    vlib_cli_command_t * cmd)
 {
+  nat64_main_t *nm = &nat64_main;
   unformat_input_t _line_input, *line_input = &_line_input;
   ip4_address_t start_addr, end_addr, this_addr;
   u32 start_host_order, end_host_order;
@@ -34,6 +35,10 @@ nat64_add_del_pool_addr_command_fn (vlib_main_t * vm,
   u8 is_add = 1;
   clib_error_t *error = 0;
 
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   /* Get a line of input. */
   if (!unformat_user (input, unformat_line_input, line_input))
     return 0;
@@ -124,6 +129,12 @@ nat64_show_pool_command_fn (vlib_main_t * vm,
 			    unformat_input_t * input,
 			    vlib_cli_command_t * cmd)
 {
+  nat64_main_t *nm = &nat64_main;
+
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   vlib_cli_output (vm, "NAT64 pool:");
   nat64_pool_addr_walk (nat64_cli_pool_walk, vm);
 
@@ -135,6 +146,7 @@ nat64_interface_feature_command_fn (vlib_main_t * vm,
 				    unformat_input_t *
 				    input, vlib_cli_command_t * cmd)
 {
+  nat64_main_t *nm = &nat64_main;
   unformat_input_t _line_input, *line_input = &_line_input;
   vnet_main_t *vnm = vnet_get_main ();
   clib_error_t *error = 0;
@@ -144,6 +156,10 @@ nat64_interface_feature_command_fn (vlib_main_t * vm,
   u8 is_add = 1;
   int i, rv;
 
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   /* Get a line of input. */
   if (!unformat_user (input, unformat_line_input, line_input))
     return 0;
@@ -261,6 +277,12 @@ nat64_show_interfaces_command_fn (vlib_main_t * vm,
 				  unformat_input_t *
 				  input, vlib_cli_command_t * cmd)
 {
+  nat64_main_t *nm = &nat64_main;
+
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   vlib_cli_output (vm, "NAT64 interfaces:");
   nat64_interfaces_walk (nat64_cli_interface_walk, vm);
 
@@ -273,6 +295,7 @@ nat64_add_del_static_bib_command_fn (vlib_main_t *
 				     unformat_input_t
 				     * input, vlib_cli_command_t * cmd)
 {
+  nat64_main_t *nm = &nat64_main;
   unformat_input_t _line_input, *line_input = &_line_input;
   clib_error_t *error = 0;
   u8 is_add = 1;
@@ -285,6 +308,10 @@ nat64_add_del_static_bib_command_fn (vlib_main_t *
   u8 p = 0;
   int rv;
 
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   if (!unformat_user (input, unformat_line_input, line_input))
     return 0;
 
@@ -382,6 +409,10 @@ nat64_show_bib_command_fn (vlib_main_t * vm,
   clib_error_t *error = 0;
   snat_protocol_t proto = 0;
 
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   if (!unformat_user (input, unformat_line_input, line_input))
     return 0;
 
@@ -407,6 +438,7 @@ static clib_error_t *
 nat64_set_timeouts_command_fn (vlib_main_t * vm, unformat_input_t * input,
 			       vlib_cli_command_t * cmd)
 {
+  nat64_main_t *nm = &nat64_main;
   unformat_input_t _line_input, *line_input = &_line_input;
   clib_error_t *error = 0;
   u32 timeout, tcp_trans, tcp_est, tcp_incoming_syn;
@@ -415,6 +447,10 @@ nat64_set_timeouts_command_fn (vlib_main_t * vm, unformat_input_t * input,
   tcp_est = nat64_get_tcp_est_timeout ();
   tcp_incoming_syn = nat64_get_tcp_incoming_syn_timeout ();
 
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   if (!unformat_user (input, unformat_line_input, line_input))
     return 0;
 
@@ -490,6 +526,12 @@ static clib_error_t *
 nat64_show_timeouts_command_fn (vlib_main_t * vm, unformat_input_t * input,
 				vlib_cli_command_t * cmd)
 {
+  nat64_main_t *nm = &nat64_main;
+
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   vlib_cli_output (vm, "NAT64 session timeouts:");
   vlib_cli_output (vm, " UDP %usec", nat64_get_udp_timeout ());
   vlib_cli_output (vm, " ICMP %usec", nat64_get_icmp_timeout ());
@@ -553,6 +595,10 @@ nat64_show_st_command_fn (vlib_main_t * vm,
   clib_error_t *error = 0;
   snat_protocol_t proto = 0;
 
+  if (nm->is_disabled)
+    return clib_error_return (0,
+			      "NAT64 disabled, multi thread not supported");
+
   if (!unformat_user (input, unformat_line_input, line_input))
     return 0;
 
diff --git a/src/plugins/snat/snat.c b/src/plugins/snat/snat.c
index 351f8dc7e12..df0a5a07294 100644
--- a/src/plugins/snat/snat.c
+++ b/src/plugins/snat/snat.c
@@ -725,7 +725,7 @@ snat_ip4_add_del_interface_address_cb (ip4_main_t * im,
 static clib_error_t * snat_init (vlib_main_t * vm)
 {
   snat_main_t * sm = &snat_main;
-  clib_error_t * error = 0, * error_nat64 = 0;
+  clib_error_t * error = 0;
   ip4_main_t * im = &ip4_main;
   ip_lookup_main_t * lm = &im->lookup_main;
   uword *p;
@@ -772,6 +772,8 @@ static clib_error_t * snat_init (vlib_main_t * vm)
     }
 
   error = snat_api_init(vm, sm);
+  if (error)
+    return error;
 
   /* Set up the interface address add/del callback */
   cb4.function = snat_ip4_add_del_interface_address_cb;
@@ -782,9 +784,7 @@ static clib_error_t * snat_init (vlib_main_t * vm)
   /* Init IPFIX logging */
   snat_ipfix_logging_init(vm);
 
-  error_nat64 = nat64_init(vm);
-  if (error_nat64)
-    clib_warning("NAT64 init failed: %U", format_clib_error, error_nat64);
+  error = nat64_init(vm);
 
   return error;
 }
diff --git a/src/plugins/snat/snat_api.c b/src/plugins/snat/snat_api.c
index 383df39958b..aa0b59ac4a0 100644
--- a/src/plugins/snat/snat_api.c
+++ b/src/plugins/snat/snat_api.c
@@ -1210,6 +1210,7 @@ static void
 {
   vl_api_nat64_add_del_pool_addr_range_reply_t *rmp;
   snat_main_t *sm = &snat_main;
+  nat64_main_t *nm = &nat64_main;
   int rv = 0;
   ip4_address_t this_addr;
   u32 start_host_order, end_host_order;
@@ -1217,6 +1218,12 @@ static void
   int i, count;
   u32 *tmp;
 
+  if (nm->is_disabled)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto send_reply;
+    }
+
   tmp = (u32 *) mp->start_addr;
   start_host_order = clib_host_to_net_u32 (tmp[0]);
   tmp = (u32 *) mp->end_addr;
@@ -1291,6 +1298,10 @@ static void
 vl_api_nat64_pool_addr_dump_t_handler (vl_api_nat64_pool_addr_dump_t * mp)
 {
   unix_shared_memory_queue_t *q;
+  nat64_main_t *nm = &nat64_main;
+
+  if (nm->is_disabled)
+    return;
 
   q = vl_api_client_index_to_input_queue (mp->client_index);
   if (q == 0)
@@ -1320,9 +1331,16 @@ vl_api_nat64_add_del_interface_t_handler (vl_api_nat64_add_del_interface_t *
 					  mp)
 {
   snat_main_t *sm = &snat_main;
+  nat64_main_t *nm = &nat64_main;
   vl_api_nat64_add_del_interface_reply_t *rmp;
   int rv = 0;
 
+  if (nm->is_disabled)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto send_reply;
+    }
+
   VALIDATE_SW_IF_INDEX (mp);
 
   rv =
@@ -1331,6 +1349,7 @@ vl_api_nat64_add_del_interface_t_handler (vl_api_nat64_add_del_interface_t *
 
   BAD_SW_IF_INDEX_LABEL;
 
+send_reply:
   REPLY_MACRO (VL_API_NAT64_ADD_DEL_INTERFACE_REPLY);
 }
 
@@ -1371,6 +1390,10 @@ static void
 vl_api_nat64_interface_dump_t_handler (vl_api_nat64_interface_dump_t * mp)
 {
   unix_shared_memory_queue_t *q;
+  nat64_main_t *nm = &nat64_main;
+
+  if (nm->is_disabled)
+    return;
 
   q = vl_api_client_index_to_input_queue (mp->client_index);
   if (q == 0)
@@ -1400,11 +1423,18 @@ static void
   (vl_api_nat64_add_del_static_bib_t * mp)
 {
   snat_main_t *sm = &snat_main;
+  nat64_main_t *nm = &nat64_main;
   vl_api_nat64_add_del_static_bib_reply_t *rmp;
   ip6_address_t in_addr;
   ip4_address_t out_addr;
   int rv = 0;
 
+  if (nm->is_disabled)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto send_reply;
+    }
+
   memcpy (&in_addr.as_u8, mp->i_addr, 16);
   memcpy (&out_addr.as_u8, mp->o_addr, 4);
 
@@ -1416,6 +1446,7 @@ static void
 				    clib_net_to_host_u32 (mp->vrf_id),
 				    mp->is_add);
 
+send_reply:
   REPLY_MACRO (VL_API_NAT64_ADD_DEL_STATIC_BIB_REPLY);
 }
 
@@ -1472,6 +1503,9 @@ vl_api_nat64_bib_dump_t_handler (vl_api_nat64_bib_dump_t * mp)
   nat64_main_t *nm = &nat64_main;
   snat_protocol_t proto;
 
+  if (nm->is_disabled)
+    return;
+
   q = vl_api_client_index_to_input_queue (mp->client_index);
   if (q == 0)
     return;
@@ -1500,9 +1534,16 @@ static void
 vl_api_nat64_set_timeouts_t_handler (vl_api_nat64_set_timeouts_t * mp)
 {
   snat_main_t *sm = &snat_main;
+  nat64_main_t *nm = &nat64_main;
   vl_api_nat64_set_timeouts_reply_t *rmp;
   int rv = 0;
 
+  if (nm->is_disabled)
+    {
+      rv = VNET_API_ERROR_FEATURE_DISABLED;
+      goto send_reply;
+    }
+
   rv = nat64_set_icmp_timeout (ntohl (mp->icmp));
   if (rv)
     goto send_reply;
@@ -1536,9 +1577,13 @@ static void
 vl_api_nat64_get_timeouts_t_handler (vl_api_nat64_get_timeouts_t * mp)
 {
   snat_main_t *sm = &snat_main;
+  nat64_main_t *nm = &nat64_main;
   vl_api_nat64_get_timeouts_reply_t *rmp;
   int rv = 0;
 
+  if (nm->is_disabled)
+    return;
+
   /* *INDENT-OFF* */
   REPLY_MACRO2 (VL_API_NAT64_GET_TIMEOUTS_REPLY,
   ({
@@ -1605,6 +1650,9 @@ vl_api_nat64_st_dump_t_handler (vl_api_nat64_st_dump_t * mp)
   nat64_main_t *nm = &nat64_main;
   snat_protocol_t proto;
 
+  if (nm->is_disabled)
+    return;
+
   q = vl_api_client_index_to_input_queue (mp->client_index);
   if (q == 0)
     return;