Enhance and fix packet trace for IP forwarding as follows:

1. Add fib index to IP6 forwarding trace.
2. Display adjacency index in IP forwarding trace.
3. Fix adjacency display for L3 to L2 forwarding such as
   BVI and VXLAN tunnel decap.
4. Setup VXLAN tunnel fib index properly for packet trace.

Change-Id: I261fea5abf51e2550d24cdcee53887be2fdd08de
Signed-off-by: John Lo <loj@cisco.com>

5 files changed, 19 insertions, 4 deletions

diff --git a/vnet/vnet/ip/ip4_forward.c b/vnet/vnet/ip/ip4_forward.c
index fd304163..010e7796 100644
--- a/vnet/vnet/ip/ip4_forward.c
+++ b/vnet/vnet/ip/ip4_forward.c
@@ -1753,8 +1753,8 @@ static u8 * format_ip4_forward_next_trace (u8 * s, va_list * args)
   uword indent = format_get_indent (s);
 
   adj = ip_get_adjacency (&im->lookup_main, t->adj_index);
-  s = format (s, "fib: %d adjacency: %U flow hash: 0x%08x",
-	      t->fib_index, format_ip_adjacency,
+  s = format (s, "fib %d adj-idx %d : %U flow hash: 0x%08x",
+	      t->fib_index, t->adj_index, format_ip_adjacency,
 	      vnm, &im->lookup_main, t->adj_index, t->flow_hash);
   switch (adj->lookup_next_index)
     {
diff --git a/vnet/vnet/ip/ip6_forward.c b/vnet/vnet/ip/ip6_forward.c
index f0065e96..abd34208 100644
--- a/vnet/vnet/ip/ip6_forward.c
+++ b/vnet/vnet/ip/ip6_forward.c
@@ -1181,6 +1181,7 @@ typedef struct {
   /* Adjacency taken. */
   u32 adj_index;
   u32 flow_hash;
+  u32 fib_index;
 
   /* Packet data, possibly *after* rewrite. */
   u8 packet_data[64 - 1*sizeof(u32)];
@@ -1197,8 +1198,8 @@ static u8 * format_ip6_forward_next_trace (u8 * s, va_list * args)
   uword indent = format_get_indent (s);
 
   adj = ip_get_adjacency (&im->lookup_main, t->adj_index);
-  s = format (s, "adjacency: %U flow hash: 0x%08x",
-	      format_ip_adjacency,
+  s = format (s, "fib %d adj-idx %d : %U flow hash: 0x%08x",
+	      t->fib_index, t->adj_index, format_ip_adjacency,
 	      vnm, &im->lookup_main, t->adj_index, t->flow_hash);
   switch (adj->lookup_next_index)
     {
@@ -1225,6 +1226,7 @@ ip6_forward_next_trace (vlib_main_t * vm,
 			vlib_rx_or_tx_t which_adj_index)
 {
   u32 * from, n_left;
+  ip6_main_t * im = &ip6_main;
 
   n_left = frame->n_vectors;
   from = vlib_frame_vector_args (frame);
@@ -1250,6 +1252,8 @@ ip6_forward_next_trace (vlib_main_t * vm,
 	  t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 	  t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
+	  t0->fib_index = vec_elt (im->fib_index_by_sw_if_index, 
+                             vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 	  memcpy (t0->packet_data,
 		  vlib_buffer_get_current (b0),
 		  sizeof (t0->packet_data));
@@ -1259,6 +1263,8 @@ ip6_forward_next_trace (vlib_main_t * vm,
 	  t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
 	  t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
+	  t1->fib_index = vec_elt (im->fib_index_by_sw_if_index, 
+                             vnet_buffer(b1)->sw_if_index[VLIB_RX]);
 	  memcpy (t1->packet_data,
 		  vlib_buffer_get_current (b1),
 		  sizeof (t1->packet_data));
@@ -1282,6 +1288,8 @@ ip6_forward_next_trace (vlib_main_t * vm,
 	  t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
 	  t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
+	  t0->fib_index = vec_elt (im->fib_index_by_sw_if_index, 
+                             vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 	  memcpy (t0->packet_data,
 		  vlib_buffer_get_current (b0),
 		  sizeof (t0->packet_data));
diff --git a/vnet/vnet/l2/l2_input.c b/vnet/vnet/l2/l2_input.c
index 34f8a771..31744f5f 100644
--- a/vnet/vnet/l2/l2_input.c
+++ b/vnet/vnet/l2/l2_input.c
@@ -430,6 +430,7 @@ VLIB_REGISTER_NODE (l2input_node,static) = {
   .name = "l2-input",
   .vector_size = sizeof (u32),
   .format_trace = format_l2input_trace,
+  .format_buffer = format_ethernet_header_with_length,
   .type = VLIB_NODE_TYPE_INTERNAL,
   
   .n_errors = ARRAY_LEN(l2input_error_strings),
diff --git a/vnet/vnet/vxlan/encap.c b/vnet/vnet/vxlan/encap.c
index 4b475f83..dfa3bf77 100644
--- a/vnet/vnet/vxlan/encap.c
+++ b/vnet/vnet/vxlan/encap.c
@@ -232,6 +232,8 @@ vxlan_encap (vlib_main_t * vm,
           /* Reset to look up tunnel partner in the configured FIB */
           vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
           vnet_buffer(b1)->sw_if_index[VLIB_TX] = t1->encap_fib_index;
+          vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
+          vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1;
           pkts_encapsulated += 2;
 
  	  len0 = vlib_buffer_length_in_chain (vm, b0);
@@ -374,6 +376,7 @@ vxlan_encap (vlib_main_t * vm,
 
           /* Reset to look up tunnel partner in the configured FIB */
           vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index;
+          vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0;
           pkts_encapsulated ++;
 
 	  len0 = vlib_buffer_length_in_chain (vm, b0);
diff --git a/vnet/vnet/vxlan/vxlan.c b/vnet/vnet/vxlan/vxlan.c
index 316f8cb1..28ed173c 100644
--- a/vnet/vnet/vxlan/vxlan.c
+++ b/vnet/vnet/vxlan/vxlan.c
@@ -142,6 +142,7 @@ int vnet_vxlan_add_del_tunnel
   vxlan_main_t * vxm = &vxlan_main;
   vxlan_tunnel_t *t = 0;
   vnet_main_t * vnm = vxm->vnet_main;
+  ip4_main_t * im4 = &ip4_main;
   vnet_hw_interface_t * hi;
   uword * p;
   u32 hw_if_index = ~0;
@@ -231,6 +232,8 @@ int vnet_vxlan_add_del_tunnel
 	}
       vnet_sw_interface_set_flags (vnm, sw_if_index, 
                                    VNET_SW_INTERFACE_FLAG_ADMIN_UP);
+      vec_validate (im4->fib_index_by_sw_if_index, sw_if_index);
+      im4->fib_index_by_sw_if_index[sw_if_index] = t->encap_fib_index;
     }
   else
     {