Send GARP/NA on bonded intf slave up/down if in active-backup mode

If a bonded interface is in active-backup mode and configured with
IPv4 and/or IPv6 addresses, on slave interface link up/down, send
a GARP packet if configured with an IPv4 address and an unsolcited
NA if configured with an IPv6 address. These packets can help with
faster route convergence in the next hop router/switch.

Change-Id: I68ccb11a4a40cda414704fa08ee0171c952befa2
Signed-off-by: John Lo <loj@cisco.com>
(cherry picked from commit 8b81cb43359380e50d3fc216d93ff05894149939)

1 files changed, 62 insertions, 0 deletions

diff --git a/src/plugins/dpdk/device/common.c b/src/plugins/dpdk/device/common.c
index 1a9688e75e5..df52c58fa18 100644
--- a/src/plugins/dpdk/device/common.c
+++ b/src/plugins/dpdk/device/common.c
@@ -12,13 +12,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 #include <vnet/vnet.h>
 #include <vppinfra/vec.h>
 #include <vppinfra/format.h>
 #include <vlib/unix/cj.h>
 #include <assert.h>
 
+#include <vnet/ip/ip.h>
 #include <vnet/ethernet/ethernet.h>
+#include <vnet/ethernet/arp_packet.h>
 #include <dpdk/device/dpdk.h>
 
 #include <dpdk/device/dpdk_priv.h>
@@ -178,6 +181,65 @@ dpdk_device_stop (dpdk_device_t * xd)
     }
 }
 
+void
+dpdk_port_state_callback (uint8_t port_id,
+			  enum rte_eth_event_type type, void *param)
+{
+  struct rte_eth_link link;
+  vlib_main_t *vm = vlib_get_main ();
+  dpdk_device_t *xd = &dpdk_main.devices[port_id];
+
+  RTE_SET_USED (param);
+  if (type != RTE_ETH_EVENT_INTR_LSC)
+    {
+      clib_warning ("Unknown event %d received for port %d", type, port_id);
+      return;
+    }
+
+  rte_eth_link_get_nowait (port_id, &link);
+  u8 link_up = link.link_status;
+
+  if (xd->flags & DPDK_DEVICE_FLAG_BOND_SLAVE)
+    {
+      u8 bd_port = xd->bond_port;
+      int bd_mode = rte_eth_bond_mode_get (bd_port);
+
+      if ((link_up && !(xd->flags & DPDK_DEVICE_FLAG_BOND_SLAVE_UP)) ||
+	  (!link_up && (xd->flags & DPDK_DEVICE_FLAG_BOND_SLAVE_UP)))
+	{
+	  clib_warning ("Port %d state to %s, "
+			"slave of port %d BondEthernet%d in mode %d",
+			port_id, (link_up) ? "UP" : "DOWN",
+			bd_port, xd->port_id, bd_mode);
+	  if (bd_mode == BONDING_MODE_ACTIVE_BACKUP)
+	    {
+	      rte_eth_link_get_nowait (bd_port, &link);
+	      if (link.link_status)	/* bonded interface up */
+		{
+		  u32 hw_if_index = dpdk_main.devices[bd_port].hw_if_index;
+		  vlib_process_signal_event
+		    (vm, send_garp_na_process_node_index, SEND_GARP_NA,
+		     hw_if_index);
+		}
+	    }
+	}
+      if (link_up)		/* Update slave link status */
+	xd->flags |= DPDK_DEVICE_FLAG_BOND_SLAVE_UP;
+      else
+	xd->flags &= ~DPDK_DEVICE_FLAG_BOND_SLAVE_UP;
+    }
+  else				/* Should not happen as callback not setup for "normal" links */
+    {
+      if (link_up)
+	clib_warning ("Port %d Link Up - speed %u Mbps - %s",
+		      port_id, (unsigned) link.link_speed,
+		      (link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
+		      "full-duplex" : "half-duplex");
+      else
+	clib_warning ("Port %d Link Down\n\n", port_id);
+    }
+}
+
 /*
  * fd.io coding-style-patch-verification: ON
  *