ip: Path MTU

[vpp.git] / src / vnet / adj / adj.c

diff --git a/src/vnet/adj/adj.c b/src/vnet/adj/adj.c
index bafa336..8808294 100644 (file)
--- a/src/vnet/adj/adj.c
+++ b/src/vnet/adj/adj.c
@@ -20,6 +20,7 @@
 #include <vnet/adj/adj_mcast.h>
 #include <vnet/adj/adj_delegate.h>
 #include <vnet/fib/fib_node_list.h>
+#include <vnet/fib/fib_walk.h>
 
 /* Adjacency packet/byte counters indexed by adjacency index. */
 vlib_combined_counter_main_t adjacency_counters = {
@@ -63,15 +64,35 @@ ip_adjacency_t *
 adj_alloc (fib_protocol_t proto)
 {
     ip_adjacency_t *adj;
+    u8 need_barrier_sync = 0;
+    vlib_main_t *vm;
+    vm = vlib_get_main();
+
+    ASSERT (vm->thread_index == 0);
+
+    pool_get_aligned_will_expand (adj_pool, need_barrier_sync,
+                                  CLIB_CACHE_LINE_BYTES);
+    /* If the adj_pool will expand, stop the parade. */
+    if (need_barrier_sync)
+        vlib_worker_thread_barrier_sync (vm);
 
     pool_get_aligned(adj_pool, adj, CLIB_CACHE_LINE_BYTES);
 
     adj_poison(adj);
 
-    /* Make sure certain fields are always initialized. */
     /* Validate adjacency counters. */
+    if (need_barrier_sync == 0)
+    {
+        /* If the adj counter pool will expand, stop the parade */
+        need_barrier_sync = vlib_validate_combined_counter_will_expand
+            (&adjacency_counters, adj_get_index (adj));
+        if (need_barrier_sync)
+            vlib_worker_thread_barrier_sync (vm);
+    }
     vlib_validate_combined_counter(&adjacency_counters,
                                    adj_get_index(adj));
+
+    /* Make sure certain fields are always initialized. */
     vlib_zero_combined_counter(&adjacency_counters,
                                adj_get_index(adj));
     fib_node_init(&adj->ia_node,
@@ -79,6 +100,7 @@ adj_alloc (fib_protocol_t proto)
 
     adj->ia_nh_proto = proto;
     adj->ia_flags = 0;
+    adj->ia_cfg_index = 0;
     adj->rewrite_header.sw_if_index = ~0;
     adj->rewrite_header.flags = 0;
     adj->lookup_next_index = 0;
@@ -88,6 +110,9 @@ adj_alloc (fib_protocol_t proto)
     clib_memset(&adj->sub_type.midchain.next_dpo, 0,
            sizeof(adj->sub_type.midchain.next_dpo));
 
+    if (need_barrier_sync)
+        vlib_worker_thread_barrier_release (vm);
+
     return (adj);
 }
 
@@ -139,6 +164,10 @@ format_ip_adjacency (u8 * s, va_list * args)
 
     adj_index = va_arg (*args, u32);
     fiaf = va_arg (*args, format_ip_adjacency_flags_t);
+
+    if (!adj_is_valid(adj_index))
+      return format(s, "<invalid adjacency>");
+
     adj = adj_get(adj_index);
 
     switch (adj->lookup_next_index)
@@ -178,7 +207,7 @@ format_ip_adjacency (u8 * s, va_list * args)
         s = format (s, "\n   flags:%U", format_adj_flags, adj->ia_flags);
         s = format (s, "\n   counts:[%Ld:%Ld]", counts.packets, counts.bytes);
        s = format (s, "\n   locks:%d", adj->ia_node.fn_locks);
-       s = format(s, "\n delegates:\n  ");
+       s = format(s, "\n delegates:");
         s = adj_delegate_format(s, adj);
 
        s = format(s, "\n children:");
@@ -245,7 +274,7 @@ adj_last_lock_gone (ip_adjacency_t *adj)
     switch (adj->lookup_next_index)
     {
     case IP_LOOKUP_NEXT_MIDCHAIN:
-        dpo_reset(&adj->sub_type.midchain.next_dpo);
+        adj_midchain_teardown(adj);
         /* FALL THROUGH */
     case IP_LOOKUP_NEXT_ARP:
     case IP_LOOKUP_NEXT_REWRITE:
@@ -260,11 +289,12 @@ adj_last_lock_gone (ip_adjacency_t *adj)
                       adj->rewrite_header.sw_if_index);
        break;
     case IP_LOOKUP_NEXT_GLEAN:
-       adj_glean_remove(adj->ia_nh_proto,
-                        adj->rewrite_header.sw_if_index);
+       adj_glean_remove(adj);
        break;
-    case IP_LOOKUP_NEXT_MCAST:
     case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
+        adj_midchain_teardown(adj);
+        /* FALL THROUGH */
+    case IP_LOOKUP_NEXT_MCAST:
        adj_mcast_remove(adj->ia_nh_proto,
                         adj->rewrite_header.sw_if_index);
        break;
@@ -297,6 +327,16 @@ adj_dpo_get_urpf (const dpo_id_t *dpo)
     return (adj->rewrite_header.sw_if_index);
 }
 
+u16
+adj_dpo_get_mtu (const dpo_id_t *dpo)
+{
+    ip_adjacency_t *adj;
+
+    adj = adj_get(dpo->dpoi_index);
+
+    return (adj->rewrite_header.max_l3_packet_bytes);
+}
+
 void
 adj_lock (adj_index_t adj_index)
 {
@@ -393,18 +433,27 @@ adj_feature_update_walk_cb (adj_index_t ai,
         ((ctx->arc == mpls_main.output_feature_arc_index) &&
          (VNET_LINK_MPLS == adj->ia_link)))
     {
+        vnet_feature_main_t *fm = &feature_main;
+        vnet_feature_config_main_t *cm;
+
+        cm = &fm->feature_config_mains[ctx->arc];
+
         if (ctx->enable)
             adj->rewrite_header.flags |= VNET_REWRITE_HAS_FEATURES;
         else
             adj->rewrite_header.flags &= ~VNET_REWRITE_HAS_FEATURES;
+
+        adj->ia_cfg_index = vec_elt (cm->config_index_by_sw_if_index,
+                                     adj->rewrite_header.sw_if_index);
     }
     return (ADJ_WALK_RC_CONTINUE);
 }
 
-void
+static void
 adj_feature_update (u32 sw_if_index,
                     u8 arc_index,
-                    u8 is_enable)
+                    u8 is_enable,
+                    void *data)
 {
     /*
      * Walk all the adjacencies on the interface to update the cached
@@ -427,6 +476,19 @@ adj_mtu_update_walk_cb (adj_index_t ai,
 
     vnet_rewrite_update_mtu (vnet_get_main(), adj->ia_link,
                              &adj->rewrite_header);
+    adj_delegate_adj_modified(adj);
+
+    /**
+     * Backwalk to all Path MTU trackers, casual like ..
+     */
+    {
+       fib_node_back_walk_ctx_t bw_ctx = {
+           .fnbw_reason = FIB_NODE_BW_REASON_FLAG_ADJ_MTU,
+       };
+
+       fib_walk_async(FIB_NODE_TYPE_ADJ, ai,
+                       FIB_WALK_PRIORITY_LOW, &bw_ctx);
+    }
 
     return (ADJ_WALK_RC_CONTINUE);
 }
@@ -586,6 +648,8 @@ adj_module_init (vlib_main_t * vm)
     adj_midchain_module_init();
     adj_mcast_module_init();
 
+    vnet_feature_register(adj_feature_update, NULL);
+
     return (NULL);
 }
 
@@ -604,9 +668,7 @@ adj_show (vlib_main_t * vm,
     {
        if (unformat (input, "%d", &ai))
            ;
-       else if (unformat (input, "sum"))
-           summary = 1;
-       else if (unformat (input, "summary"))
+       else if (unformat (input, "summary") || unformat (input, "sum"))
            summary = 1;
        else if (unformat (input, "%U",
                           unformat_vnet_sw_interface, vnet_get_main(),
@@ -642,8 +704,8 @@ adj_show (vlib_main_t * vm,
         else
         {
             /* *INDENT-OFF* */
-            pool_foreach_index(ai, adj_pool,
-            ({
+            pool_foreach_index (ai, adj_pool)
+             {
                 if (~0 != sw_if_index &&
                     sw_if_index != adj_get_sw_if_index(ai))
                 {
@@ -655,7 +717,7 @@ adj_show (vlib_main_t * vm,
                                      format_ip_adjacency, ai,
                                      FORMAT_IP_ADJACENCY_NONE);
                 }
-            }));
+            }
             /* *INDENT-ON* */
         }
     }