Update tx and output node runtime when recycling interface

When an interface is removed, and another one is created,
the nodes from the previous interface are reused. The current
code fails when the new interface type differs from the original.
It is necessary to update the node runtime, in particular the
node function, and the node format function.

Jira: VPP-460

Change-Id: I2fc3c609e0173a7f62597230768669039853ab03
Signed-off-by: Pierre Pfister <ppfister@cisco.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/vnet/vnet/interface.c b/vnet/vnet/interface.c
index 37951c71ed4..7a808add832 100644
--- a/vnet/vnet/interface.c
+++ b/vnet/vnet/interface.c
@@ -721,6 +721,8 @@ vnet_register_interface (vnet_main_t * vnm,
     {
       vnet_hw_interface_nodes_t *hn;
       vnet_interface_output_runtime_t *rt;
+      vlib_node_t *node;
+      vlib_node_runtime_t *nrt;
 
       hn = vec_end (im->deleted_hw_interface_nodes) - 1;
 
@@ -742,6 +744,22 @@ vnet_register_interface (vnet_main_t * vnm,
       rt->sw_if_index = hw->sw_if_index;
       rt->dev_instance = hw->dev_instance;
 
+      /* The new class may differ from the old one.
+       * Functions have to be updated. */
+      node = vlib_get_node (vm, hw->output_node_index);
+      node->function = dev_class->no_flatten_output_chains ?
+	vnet_interface_output_node_no_flatten_multiarch_select () :
+	vnet_interface_output_node_multiarch_select ();
+      node->format_trace = format_vnet_interface_output_trace;
+      nrt = vlib_node_get_runtime (vm, hw->output_node_index);
+      nrt->function = node->function;
+
+      node = vlib_get_node (vm, hw->tx_node_index);
+      node->function = dev_class->tx_function;
+      node->format_trace = dev_class->format_tx_trace;
+      nrt = vlib_node_get_runtime (vm, hw->tx_node_index);
+      nrt->function = node->function;
+
       vlib_worker_thread_node_runtime_update ();
       _vec_len (im->deleted_hw_interface_nodes) -= 1;
     }