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, 6 insertions, 0 deletions

diff --git a/src/vnet/bonding/node.h b/src/vnet/bonding/node.h
index 5c6ff32ac4a..7b8e1ad7cb2 100644
--- a/src/vnet/bonding/node.h
+++ b/src/vnet/bonding/node.h
@@ -70,6 +70,11 @@ typedef enum
 #undef _
 } bond_load_balance_t;
 
+enum
+{
+  BOND_SEND_GARP_NA = 1,
+} bond_send_garp_na_process_event_t;
+
 typedef struct
 {
   u8 hw_addr_set;
@@ -325,6 +330,7 @@ typedef struct
 } bond_load_balance_func_t;
 
 extern vlib_node_registration_t bond_input_node;
+extern vlib_node_registration_t bond_process_node;
 extern vnet_device_class_t bond_dev_class;
 extern bond_main_t bond_main;