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, 2 insertions, 3 deletions

diff --git a/src/vnet/ethernet/arp_packet.h b/src/vnet/ethernet/arp_packet.h
index d2a23a5949f..e5f424d7879 100644
--- a/src/vnet/ethernet/arp_packet.h
+++ b/src/vnet/ethernet/arp_packet.h
@@ -168,10 +168,9 @@ ethernet_arp_ip4_entry_t *ip4_neighbors_pool (void);
 ethernet_arp_ip4_entry_t *ip4_neighbor_entries (u32 sw_if_index);
 u8 *format_ethernet_arp_ip4_entry (u8 * s, va_list * va);
 
-void send_ip4_garp (vlib_main_t * vm, const vnet_hw_interface_t * hi);
+void send_ip4_garp (vlib_main_t * vm, u32 sw_if_index);
 void send_ip4_garp_w_addr (vlib_main_t * vm,
-			   const ip4_address_t * ip4_addr,
-			   const vnet_hw_interface_t * hi);
+			   const ip4_address_t * ip4_addr, u32 sw_if_index);
 
 #endif /* included_ethernet_arp_packet_h */