stats: support multiple works for error counters

The current code only allowed access to the main thread error counters.
That is not so useful for a multi worker instance.
No return a vector indexed by thread of counter_t values.

Type: fix

Change-Id: Ie322c8889c0c8175e1116e71de04a2cf453b9ed7
Signed-off-by: Ole Troan <ot@cisco.com>

16 files changed, 134 insertions, 114 deletions

diff --git a/src/vlib/counter.c b/src/vlib/counter.c
index 5b73d5fa21a..faf106942b7 100644
--- a/src/vlib/counter.c
+++ b/src/vlib/counter.c
@@ -38,6 +38,7 @@
  */
 
 #include <vlib/vlib.h>
+#include <vlib/stat_weak_inlines.h>
 
 void
 vlib_clear_simple_counters (vlib_simple_counter_main_t * cm)
@@ -74,19 +75,6 @@ vlib_clear_combined_counters (vlib_combined_counter_main_t * cm)
     }
 }
 
-void *vlib_stats_push_heap (void *) __attribute__ ((weak));
-void *
-vlib_stats_push_heap (void *unused)
-{
-  return 0;
-};
-
-void vlib_stats_pop_heap (void *, void *, u32, int) __attribute__ ((weak));
-void
-vlib_stats_pop_heap (void *notused, void *notused2, u32 i, int type)
-{
-};
-
 void
 vlib_validate_simple_counter (vlib_simple_counter_main_t * cm, u32 index)
 {
diff --git a/src/vlib/error.c b/src/vlib/error.c
index a416649cfa7..7c61f319fc0 100644
--- a/src/vlib/error.c
+++ b/src/vlib/error.c
@@ -39,6 +39,7 @@
 
 #include <vlib/vlib.h>
 #include <vppinfra/heap.h>
+#include <vlib/stat_weak_inlines.h>
 
 uword
 vlib_error_drop_buffers (vlib_main_t * vm,
@@ -109,20 +110,6 @@ vlib_error_drop_buffers (vlib_main_t * vm,
   return n_buffers;
 }
 
-void vlib_stats_register_error_index (u8 *, u64 *, u64)
-  __attribute__ ((weak));
-void
-vlib_stats_register_error_index (u8 * notused, u64 * notused2, u64 notused3)
-{
-};
-
-void vlib_stats_pop_heap2 (void *, u32, void *) __attribute__ ((weak));
-void
-vlib_stats_pop_heap2 (void *notused, u32 notused2, void *notused3)
-{
-};
-
-
 /* Reserves given number of error codes for given node. */
 void
 vlib_register_errors (vlib_main_t * vm,
@@ -132,7 +119,6 @@ vlib_register_errors (vlib_main_t * vm,
   vlib_node_t *n = vlib_get_node (vm, node_index);
   uword l;
   void *oldheap;
-  void *vlib_stats_push_heap (void) __attribute__ ((weak));
 
   ASSERT (vlib_get_thread_index () == 0);
 
@@ -157,7 +143,7 @@ vlib_register_errors (vlib_main_t * vm,
   vec_validate (vm->error_elog_event_types, l - 1);
 
   /* Switch to the stats segment ... */
-  oldheap = vlib_stats_push_heap ();
+  oldheap = vlib_stats_push_heap (0);
 
   /* Allocate a counter/elog type for each error. */
   vec_validate (em->counters, l - 1);
@@ -186,7 +172,7 @@ vlib_register_errors (vlib_main_t * vm,
   }
 
   /* (re)register the em->counters base address, switch back to main heap */
-  vlib_stats_pop_heap2 (em->counters, vm->thread_index, oldheap);
+  vlib_stats_pop_heap2 (em->counters, vm->thread_index, oldheap, 1);
 
   {
     elog_event_type_t t;
diff --git a/src/vlib/stat_weak_inlines.h b/src/vlib/stat_weak_inlines.h
new file mode 100644
index 00000000000..5c04610ef13
--- /dev/null
+++ b/src/vlib/stat_weak_inlines.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * NOTE: Only include this file from external components that require
+ * a loose coupling to the stats component.
+ */
+
+#ifndef included_stat_weak_inlines_h
+#define included_stat_weak_inlines_h
+void *vlib_stats_push_heap (void *) __attribute__ ((weak));
+void *
+vlib_stats_push_heap (void *unused)
+{
+  return 0;
+};
+
+void vlib_stats_pop_heap (void *, void *, u32, int) __attribute__ ((weak));
+void
+vlib_stats_pop_heap (void *notused, void *notused2, u32 i, int type)
+{
+};
+void vlib_stats_register_error_index (u8 *, u64 *, u64)
+  __attribute__ ((weak));
+void
+vlib_stats_register_error_index (u8 * notused, u64 * notused2, u64 notused3)
+{
+};
+
+void vlib_stats_pop_heap2 (void *, u32, void *, int) __attribute__ ((weak));
+void
+vlib_stats_pop_heap2 (void *notused, u32 notused2, void *notused3,
+		      int notused4)
+{
+};
+
+void vlib_stat_segment_lock (void) __attribute__ ((weak));
+void
+vlib_stat_segment_lock (void)
+{
+}
+
+void vlib_stat_segment_unlock (void) __attribute__ ((weak));
+void
+vlib_stat_segment_unlock (void)
+{
+}
+
+#endif
diff --git a/src/vlib/threads.c b/src/vlib/threads.c
index 6a23bfd8a2f..22fa5f12ecd 100644
--- a/src/vlib/threads.c
+++ b/src/vlib/threads.c
@@ -23,6 +23,8 @@
 #include <vlib/threads.h>
 #include <vlib/unix/cj.h>
 
+#include <vlib/stat_weak_inlines.h>
+
 DECLARE_CJ_GLOBAL_LOG;
 
 #define FRAME_QUEUE_NELTS 64
@@ -872,8 +874,13 @@ start_workers (vlib_main_t * vm)
 	      clib_mem_set_heap (oldheap);
 	      vec_add1_aligned (vlib_mains, vm_clone, CLIB_CACHE_LINE_BYTES);
 
+	      /* Switch to the stats segment ... */
+	      void *oldheap = vlib_stats_push_heap (0);
 	      vm_clone->error_main.counters = vec_dup_aligned
 		(vlib_mains[0]->error_main.counters, CLIB_CACHE_LINE_BYTES);
+	      vlib_stats_pop_heap2 (vm_clone->error_main.counters,
+				    worker_thread_index, oldheap, 1);
+
 	      vm_clone->error_main.counters_last_clear = vec_dup_aligned
 		(vlib_mains[0]->error_main.counters_last_clear,
 		 CLIB_CACHE_LINE_BYTES);
@@ -1036,9 +1043,15 @@ vlib_worker_thread_node_refork (void)
   clib_memcpy_fast (&vm_clone->error_main, &vm->error_main,
 		    sizeof (vm->error_main));
   j = vec_len (vm->error_main.counters) - 1;
+
+  /* Switch to the stats segment ... */
+  void *oldheap = vlib_stats_push_heap (0);
   vec_validate_aligned (old_counters, j, CLIB_CACHE_LINE_BYTES);
-  vec_validate_aligned (old_counters_all_clear, j, CLIB_CACHE_LINE_BYTES);
   vm_clone->error_main.counters = old_counters;
+  vlib_stats_pop_heap2 (vm_clone->error_main.counters, vm_clone->thread_index,
+			oldheap, 0);
+
+  vec_validate_aligned (old_counters_all_clear, j, CLIB_CACHE_LINE_BYTES);
   vm_clone->error_main.counters_last_clear = old_counters_all_clear;
 
   nm_clone = &vm_clone->node_main;
@@ -1466,18 +1479,6 @@ vlib_worker_thread_barrier_sync_int (vlib_main_t * vm, const char *func_name)
 
 }
 
-void vlib_stat_segment_lock (void) __attribute__ ((weak));
-void
-vlib_stat_segment_lock (void)
-{
-}
-
-void vlib_stat_segment_unlock (void) __attribute__ ((weak));
-void
-vlib_stat_segment_unlock (void)
-{
-}
-
 void
 vlib_worker_thread_barrier_release (vlib_main_t * vm)
 {
diff --git a/src/vnet/interface_api.c b/src/vnet/interface_api.c
index 1b913823708..a91936f72de 100644
--- a/src/vnet/interface_api.c
+++ b/src/vnet/interface_api.c
@@ -392,18 +392,6 @@ done:
   REPLY_MACRO (VL_API_SW_INTERFACE_ADD_DEL_ADDRESS_REPLY);
 }
 
-void stats_dslock_with_hint (int hint, int tag) __attribute__ ((weak));
-void
-stats_dslock_with_hint (int hint, int tag)
-{
-}
-
-void stats_dsunlock (void) __attribute__ ((weak));
-void
-stats_dsunlock (void)
-{
-}
-
 static void
 vl_api_sw_interface_set_table_t_handler (vl_api_sw_interface_set_table_t * mp)
 {
@@ -414,15 +402,11 @@ vl_api_sw_interface_set_table_t_handler (vl_api_sw_interface_set_table_t * mp)
 
   VALIDATE_SW_IF_INDEX (mp);
 
-  stats_dslock_with_hint (1 /* release hint */ , 4 /* tag */ );
-
   if (mp->is_ipv6)
     rv = ip_table_bind (FIB_PROTOCOL_IP6, sw_if_index, table_id, 1);
   else
     rv = ip_table_bind (FIB_PROTOCOL_IP4, sw_if_index, table_id, 1);
 
-  stats_dsunlock ();
-
   BAD_SW_IF_INDEX_LABEL;
 
   REPLY_MACRO (VL_API_SW_INTERFACE_SET_TABLE_REPLY);
diff --git a/src/vnet/ip/ip_api.c b/src/vnet/ip/ip_api.c
index 5a6053d1f42..f4e5d1776bd 100644
--- a/src/vnet/ip/ip_api.c
+++ b/src/vnet/ip/ip_api.c
@@ -119,9 +119,6 @@ _(IP_REASSEMBLY_ENABLE_DISABLE, ip_reassembly_enable_disable)           \
 _(IP_PUNT_REDIRECT_DUMP, ip_punt_redirect_dump)
 
 
-extern void stats_dslock_with_hint (int hint, int tag);
-extern void stats_dsunlock (void);
-
 static vl_api_ip_neighbor_flags_t
 ip_neighbor_flags_encode (ip_neighbor_flags_t f)
 {
@@ -704,8 +701,6 @@ vl_api_ip_neighbor_add_del_t_handler (vl_api_ip_neighbor_add_del_t * mp,
 
   VALIDATE_SW_IF_INDEX ((&mp->neighbor));
 
-  stats_dslock_with_hint (1 /* release hint */ , 7 /* tag */ );
-
   flags = ip_neighbor_flags_decode (mp->neighbor.flags);
   type = ip_address_decode (&mp->neighbor.ip_address, &ip);
   mac_address_decode (mp->neighbor.mac_address, &mac);
@@ -722,8 +717,6 @@ vl_api_ip_neighbor_add_del_t_handler (vl_api_ip_neighbor_add_del_t * mp,
   else
     rv = ip_neighbor_del (&ip, type, ntohl (mp->neighbor.sw_if_index));
 
-  stats_dsunlock ();
-
   BAD_SW_IF_INDEX_LABEL;
 
   /* *INDENT-OFF* */
@@ -879,8 +872,6 @@ add_del_route_t_handler (u8 is_multipath,
 
   path.frp_flags = path_flags;
 
-  stats_dslock_with_hint (1 /* release hint */ , 2 /* tag */ );
-
   if (is_drop || (is_local && (~0 == next_hop_sw_if_index)) ||
       is_classify || is_unreach || is_prohibit)
     {
@@ -910,7 +901,6 @@ add_del_route_t_handler (u8 is_multipath,
 	      if (pool_is_free_index (cm->tables,
 				      ntohl (classify_table_index)))
 		{
-		  stats_dsunlock ();
 		  return VNET_API_ERROR_NO_SUCH_TABLE;
 		}
 
@@ -920,7 +910,6 @@ add_del_route_t_handler (u8 is_multipath,
 	    }
 	  else
 	    {
-	      stats_dsunlock ();
 	      return VNET_API_ERROR_NO_SUCH_TABLE;
 	    }
 
@@ -964,7 +953,6 @@ add_del_route_t_handler (u8 is_multipath,
 	}
     }
 
-  stats_dsunlock ();
   return (0);
 }
 
@@ -1271,8 +1259,6 @@ mroute_add_del_handler (u8 is_add,
 {
   fib_node_index_t mfib_entry_index = ~0;
 
-  stats_dslock_with_hint (1 /* release hint */ , 2 /* tag */ );
-
   fib_route_path_t path = {
     .frp_sw_if_index = next_hop_sw_if_index,
     .frp_proto = nh_proto,
@@ -1308,7 +1294,6 @@ mroute_add_del_handler (u8 is_add,
     }
 
 done:
-  stats_dsunlock ();
   return (mfib_entry_index);
 }
 
@@ -2969,8 +2954,6 @@ vl_api_proxy_arp_add_del_t_handler (vl_api_proxy_arp_add_del_t * mp)
   u32 fib_index;
   int rv;
 
-  stats_dslock_with_hint (1 /* release hint */ , 6 /* tag */ );
-
   fib_index = fib_table_find (FIB_PROTOCOL_IP4, ntohl (mp->proxy.table_id));
 
   if (~0 == fib_index)
@@ -2985,7 +2968,6 @@ vl_api_proxy_arp_add_del_t_handler (vl_api_proxy_arp_add_del_t * mp)
   rv = vnet_proxy_arp_add_del (&lo, &hi, fib_index, mp->is_add == 0);
 
 out:
-  stats_dsunlock ();
   REPLY_MACRO (VL_API_PROXY_ARP_ADD_DEL_REPLY);
 }
 
@@ -3166,8 +3148,6 @@ ip4_reset_fib_t_handler (vl_api_reset_fib_t * mp)
   int rv = VNET_API_ERROR_NO_SUCH_FIB;
   u32 target_fib_id = ntohl (mp->vrf_id);
 
-  stats_dslock_with_hint (1 /* release hint */ , 8 /* tag */ );
-
   /* *INDENT-OFF* */
   pool_foreach (fib_table, im4->fibs,
   ({
@@ -3215,7 +3195,6 @@ ip4_reset_fib_t_handler (vl_api_reset_fib_t * mp)
     })); /* pool_foreach (fib) */
     /* *INDENT-ON* */
 
-  stats_dsunlock ();
   return rv;
 }
 
@@ -3233,8 +3212,6 @@ ip6_reset_fib_t_handler (vl_api_reset_fib_t * mp)
   int rv = VNET_API_ERROR_NO_SUCH_FIB;
   u32 target_fib_id = ntohl (mp->vrf_id);
 
-  stats_dslock_with_hint (1 /* release hint */ , 9 /* tag */ );
-
   /* *INDENT-OFF* */
   pool_foreach (fib_table, im6->fibs,
   ({
@@ -3273,7 +3250,6 @@ ip6_reset_fib_t_handler (vl_api_reset_fib_t * mp)
   })); /* pool_foreach (fib) */
   /* *INDENT-ON* */
 
-  stats_dsunlock ();
   return rv;
 }
 
diff --git a/src/vnet/mpls/mpls_api.c b/src/vnet/mpls/mpls_api.c
index 440dc9c4640..52434dae8aa 100644
--- a/src/vnet/mpls/mpls_api.c
+++ b/src/vnet/mpls/mpls_api.c
@@ -56,9 +56,6 @@ _(MPLS_TUNNEL_DUMP, mpls_tunnel_dump)                       \
 _(SW_INTERFACE_SET_MPLS_ENABLE, sw_interface_set_mpls_enable) \
 _(MPLS_FIB_DUMP, mpls_fib_dump)
 
-extern void stats_dslock_with_hint (int hint, int tag);
-extern void stats_dsunlock (void);
-
 void
 mpls_table_delete (u32 table_id, u8 is_api)
 {
@@ -318,8 +315,6 @@ vl_api_mpls_tunnel_add_del_t_handler (vl_api_mpls_tunnel_add_del_t * mp)
 
   clib_memset (&rpath, 0, sizeof (rpath));
 
-  stats_dslock_with_hint (1 /* release hint */ , 5 /* tag */ );
-
   if (mp->mt_next_hop_proto_is_ip4)
     {
       rpath.frp_proto = DPO_PROTO_IP4;
@@ -394,8 +389,6 @@ vl_api_mpls_tunnel_add_del_t_handler (vl_api_mpls_tunnel_add_del_t * mp)
 
   vec_free (rpaths);
 
-  stats_dsunlock ();
-
 out:
   /* *INDENT-OFF* */
   REPLY_MACRO2(VL_API_MPLS_TUNNEL_ADD_DEL_REPLY,
diff --git a/src/vnet/pg/pg_api.c b/src/vnet/pg/pg_api.c
index 49b661e7dc4..7775343a6f5 100644
--- a/src/vnet/pg/pg_api.c
+++ b/src/vnet/pg/pg_api.c
@@ -46,9 +46,6 @@ _(PG_CREATE_INTERFACE, pg_create_interface)                             \
 _(PG_CAPTURE, pg_capture)                                               \
 _(PG_ENABLE_DISABLE, pg_enable_disable)
 
-extern void stats_dslock_with_hint (int hint, int tag);
-extern void stats_dsunlock (void);
-
 static void
 vl_api_pg_create_interface_t_handler (vl_api_pg_create_interface_t * mp)
 {
diff --git a/src/vpp-api/client/stat_client.c b/src/vpp-api/client/stat_client.c
index a386eec30c3..8991806448a 100644
--- a/src/vpp-api/client/stat_client.c
+++ b/src/vpp-api/client/stat_client.c
@@ -231,7 +231,6 @@ copy_data (stat_segment_directory_entry_t * ep, stat_client_main_t * sm)
   int i;
   vlib_counter_t **combined_c;	/* Combined counter */
   counter_t **simple_c;		/* Simple counter */
-  counter_t *error_base;
   uint64_t *offset_vector;
 
   assert (sm->shared_header);
@@ -275,10 +274,16 @@ copy_data (stat_segment_directory_entry_t * ep, stat_client_main_t * sm)
       break;
 
     case STAT_DIR_TYPE_ERROR_INDEX:
-      error_base =
-	stat_segment_pointer (sm->shared_header,
-			      sm->shared_header->error_offset);
-      result.error_value = error_base[ep->index];
+      /* Gather errors from all threads into a vector */
+      offset_vector = stat_segment_pointer (sm->shared_header,
+					    sm->shared_header->error_offset);
+      vec_validate (result.error_vector, vec_len (offset_vector) - 1);
+      for (i = 0; i < vec_len (offset_vector); i++)
+	{
+	  counter_t *cb =
+	    stat_segment_pointer (sm->shared_header, offset_vector[i]);
+	  result.error_vector[i] = cb[ep->index];
+	}
       break;
 
     case STAT_DIR_TYPE_NAME_VECTOR:
diff --git a/src/vpp-api/client/stat_client.h b/src/vpp-api/client/stat_client.h
index 1c76a938b30..901ec325522 100644
--- a/src/vpp-api/client/stat_client.h
+++ b/src/vpp-api/client/stat_client.h
@@ -18,7 +18,7 @@
 #define included_stat_client_h
 
 #define STAT_VERSION_MAJOR     1
-#define STAT_VERSION_MINOR     1
+#define STAT_VERSION_MINOR     2
 
 #include <stdint.h>
 #include <unistd.h>
@@ -46,7 +46,7 @@ typedef struct
   union
   {
     double scalar_value;
-    uint64_t error_value;
+    counter_t *error_vector;
     counter_t **simple_counter_vec;
     vlib_counter_t **combined_counter_vec;
     uint8_t **name_vector;
diff --git a/src/vpp-api/python/vpp_papi/vpp_stats.py b/src/vpp-api/python/vpp_papi/vpp_stats.py
index c90aa349434..86a80ddc328 100644
--- a/src/vpp-api/python/vpp_papi/vpp_stats.py
+++ b/src/vpp-api/python/vpp_papi/vpp_stats.py
@@ -40,7 +40,7 @@ typedef struct
   union
   {
     double scalar_value;
-    uint64_t error_value;
+    counter_t *error_vector;
     counter_t **simple_counter_vec;
     vlib_counter_t **combined_counter_vec;
     uint8_t **name_vector;
@@ -126,6 +126,12 @@ def combined_counter_vec_list(api, e):
         vec.append(if_per_thread)
     return vec
 
+def error_vec_list(api, e):
+    vec = []
+    for thread in range(api.stat_segment_vec_len(e)):
+        vec.append(e[thread])
+    return vec
+
 def name_vec_list(api, e):
     return [ffi.string(e[i]).decode('utf-8') for i in range(api.stat_segment_vec_len(e)) if e[i] != ffi.NULL]
 
@@ -138,7 +144,7 @@ def stat_entry_to_python(api, e):
     if e.type == 3:
         return combined_counter_vec_list(api, e.combined_counter_vec)
     if e.type == 4:
-        return e.error_value
+        return error_vec_list(api, e.error_vector)
     if e.type == 5:
         return name_vec_list(api, e.name_vector)
     raise NotImplementedError()
@@ -248,6 +254,11 @@ class VPPStats(object):
                     return None
                 retries += 1
 
+    def get_err_counter(self, name):
+        """Get an error counter. The errors from each worker thread
+           are summed"""
+        return sum(self.get_counter(name))
+
     def disconnect(self):
         self.api.stat_segment_disconnect_r(self.client)
         self.api.stat_client_free(self.client)
@@ -265,8 +276,8 @@ class VPPStats(object):
                     return None
                 retries += 1
 
-        return {k: error_counters[k]
-                for k in error_counters.keys() if error_counters[k]}
+        return {k: sum(error_counters[k])
+                for k in error_counters.keys() if sum(error_counters[k])}
 
     def set_errors_str(self):
         '''Return all errors counters > 0 pretty printed'''
diff --git a/src/vpp/app/vpp_get_stats.c b/src/vpp/app/vpp_get_stats.c
index 1d878029dda..c00fb835d1c 100644
--- a/src/vpp/app/vpp_get_stats.c
+++ b/src/vpp/app/vpp_get_stats.c
@@ -80,7 +80,9 @@ stat_poll_loop (u8 ** patterns)
 	      break;
 
 	    case STAT_DIR_TYPE_ERROR_INDEX:
-	      fformat (stdout, "%llu %s\n", res[i].error_value, res[i].name);
+	      for (j = 0; j < vec_len (res[i].error_vector); j++)
+		fformat (stdout, "%llu %s\n", res[i].error_vector[j],
+			 res[i].name);
 	      break;
 
 	    case STAT_DIR_TYPE_SCALAR_INDEX:
@@ -213,7 +215,9 @@ reconnect:
 	      break;
 
 	    case STAT_DIR_TYPE_ERROR_INDEX:
-	      fformat (stdout, "%llu %s\n", res[i].error_value, res[i].name);
+	      for (j = 0; j < vec_len (res[i].error_vector); j++)
+		fformat (stdout, "[@%d] %llu %s\n", j, res[i].error_vector[j],
+			 res[i].name);
 	      break;
 
 	    case STAT_DIR_TYPE_SCALAR_INDEX:
diff --git a/src/vpp/app/vpp_prometheus_export.c b/src/vpp/app/vpp_prometheus_export.c
index e2fdd7150e5..06f1a9169cd 100644
--- a/src/vpp/app/vpp_prometheus_export.c
+++ b/src/vpp/app/vpp_prometheus_export.c
@@ -97,9 +97,13 @@ retry:
 	      }
 	  break;
 	case STAT_DIR_TYPE_ERROR_INDEX:
-	  fformat (stream, "# TYPE %s counter\n", prom_string (res[i].name));
-	  fformat (stream, "%s{thread=\"0\"} %lld\n",
-		   prom_string (res[i].name), res[i].error_value);
+	  for (j = 0; j < vec_len (res[i].error_vector); j++)
+	    {
+	      fformat (stream, "# TYPE %s counter\n",
+		       prom_string (res[i].name));
+	      fformat (stream, "%s{thread=\"%d\"} %lld\n",
+		       prom_string (res[i].name), j, res[i].error_vector[j]);
+	    }
 	  break;
 
 	case STAT_DIR_TYPE_SCALAR_INDEX:
diff --git a/src/vpp/stats/stat_segment.c b/src/vpp/stats/stat_segment.c
index bb2ffad8f6d..4cd00a22641 100644
--- a/src/vpp/stats/stat_segment.c
+++ b/src/vpp/stats/stat_segment.c
@@ -22,6 +22,7 @@
 #undef HAVE_MEMFD_CREATE
 #include <vppinfra/linux/syscall.h>
 #include <vpp-api/client/stat_client.h>
+
 stat_segment_main_t stat_segment_main;
 
 /*
@@ -200,22 +201,29 @@ stat_validate_counter_vector (stat_segment_directory_entry_t * ep, u32 max)
 }
 
 void
-vlib_stats_pop_heap2 (u64 * error_vector, u32 thread_index, void *oldheap)
+vlib_stats_pop_heap2 (u64 * error_vector, u32 thread_index, void *oldheap,
+		      int lock)
 {
   stat_segment_main_t *sm = &stat_segment_main;
   stat_segment_shared_header_t *shared_header = sm->shared_header;
 
   ASSERT (shared_header);
 
-  vlib_stat_segment_lock ();
+  if (lock)
+    vlib_stat_segment_lock ();
 
   /* Reset the client hash table pointer, since it WILL change! */
-  shared_header->error_offset =
+  vec_validate (sm->error_vector, thread_index);
+  sm->error_vector[thread_index] =
     stat_segment_offset (shared_header, error_vector);
+
+  shared_header->error_offset =
+    stat_segment_offset (shared_header, sm->error_vector);
   shared_header->directory_offset =
     stat_segment_offset (shared_header, sm->directory_vector);
 
-  vlib_stat_segment_unlock ();
+  if (lock)
+    vlib_stat_segment_unlock ();
   clib_mem_set_heap (oldheap);
 }
 
diff --git a/src/vpp/stats/stat_segment.h b/src/vpp/stats/stat_segment.h
index fd7ce79cabe..b9ffedf2169 100644
--- a/src/vpp/stats/stat_segment.h
+++ b/src/vpp/stats/stat_segment.h
@@ -110,6 +110,7 @@ typedef struct
   /* statistics segment */
   uword *directory_vector_by_name;
   stat_segment_directory_entry_t *directory_vector;
+  u64 *error_vector;
   u8 **interfaces;
   u8 **nodes;
 
diff --git a/src/vpp/stats/stats.md b/src/vpp/stats/stats.md
index 6a62ca6c8ad..20ca7909baa 100644
--- a/src/vpp/stats/stats.md
+++ b/src/vpp/stats/stats.md
@@ -106,7 +106,8 @@ int main (int argc, char **argv) {
       break;
 
       case STAT_DIR_TYPE_ERROR_INDEX:
-        fformat (stdout, "%llu %s\n", res[i].error_value, res[i].name);
+	 for (j = 0; j < vec_len (res[i].error_vector); j++)
+	   fformat (stdout, "[@%d] %llu %s\n", j, res[i].error_vector[j], res[i].name);
       break;
 
       case STAT_DIR_TYPE_SCALAR_INDEX: