bond: send gratuitous arp when the active slave went down in active-backup mode

- Modify the API send_ip6_na and send_ip4_garp to take sw_if_index instead
of vnet_hw_interface_t and add call to build_ethernet_rewrite to support
subinterface/vlan
- Add code to bonding driver to send an event to bond_process when the first
interface becomes active or when the active interface is down
- Create a bond_process to walk the interface and the corresponding
subinterfaces to send garp/ip6_na when an event is received.
- Minor cleanup in bonding/node.c

Note: dpdk bonding driver does not send garp/ip6_na for subinterfaces. There is
no attempt to fix it here. But the infra is now done and should be easy to
add the support.

Change-Id: If3ecc4cd0fb3051330f7fa11ca0dab3e18557ce1
Signed-off-by: Steven <sluong@cisco.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/src/vnet/bonding/node.c b/src/vnet/bonding/node.c
index 9479fe98dd0..5842da3f5ec 100644
--- a/src/vnet/bonding/node.c
+++ b/src/vnet/bonding/node.c
@@ -67,7 +67,7 @@ typedef enum
 {
   BOND_INPUT_NEXT_DROP,
   BOND_INPUT_N_NEXT,
-} l2output_next_t;
+} bond_output_next_t;
 
 static_always_inline u8
 packet_is_cdp (ethernet_header_t * eth)
@@ -329,7 +329,6 @@ VLIB_NODE_FN (bond_input_node) (vlib_main_t * vm,
       n_left = frame->n_vectors;	/* number of packets to process */
       b = bufs;
       sw_if_index = sw_if_indices;
-      next = nexts;
       bond_packet_trace_t *t0;
 
       while (n_left)
@@ -346,7 +345,6 @@ VLIB_NODE_FN (bond_input_node) (vlib_main_t * vm,
 	  n_left--;
 	  b++;
 	  sw_if_index++;
-	  next++;
 	}
     }