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/ip/ip6.h b/src/vnet/ip/ip6.h
index 4b24774c277..6f6724b3903 100644
--- a/src/vnet/ip/ip6.h
+++ b/src/vnet/ip/ip6.h
@@ -407,10 +407,9 @@ int vnet_ip6_nd_term (vlib_main_t * vm,
 		      ethernet_header_t * eth,
 		      ip6_header_t * ip, u32 sw_if_index, u16 bd_index);
 
-void send_ip6_na (vlib_main_t * vm, const vnet_hw_interface_t * hi);
+void send_ip6_na (vlib_main_t * vm, u32 sw_if_index);
 void send_ip6_na_w_addr (vlib_main_t * vm,
-			 const ip6_address_t * addr,
-			 const vnet_hw_interface_t * hi);
+			 const ip6_address_t * addr, u32 sw_if_index);
 
 u8 *format_ip6_forward_next_trace (u8 * s, va_list * args);