bonding: export slave's actor_oper_port_state via sysfs and netlink

Export the actor_oper_port_state of each port via sysfs and netlink.
In 802.3ad mode it is valuable for the user to be able to check the
actor_oper state, it is already exported via bond's proc entry.

Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index f7015eb..a0e600d 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -28,6 +28,7 @@
 		nla_total_size(MAX_ADDR_LEN) +	/* IFLA_BOND_SLAVE_PERM_HWADDR */
 		nla_total_size(sizeof(u16)) +	/* IFLA_BOND_SLAVE_QUEUE_ID */
 		nla_total_size(sizeof(u16)) +	/* IFLA_BOND_SLAVE_AD_AGGREGATOR_ID */
+		nla_total_size(sizeof(u8)) +	/* IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE */
 		0;
 }
 
@@ -56,12 +57,19 @@
 
 	if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) {
 		const struct aggregator *agg;
+		const struct port *ad_port;
 
+		ad_port = &SLAVE_AD_INFO(slave)->port;
 		agg = SLAVE_AD_INFO(slave)->port.aggregator;
-		if (agg)
+		if (agg) {
 			if (nla_put_u16(skb, IFLA_BOND_SLAVE_AD_AGGREGATOR_ID,
 					agg->aggregator_identifier))
 				goto nla_put_failure;
+			if (nla_put_u8(skb,
+				       IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE,
+				       ad_port->actor_oper_port_state))
+				goto nla_put_failure;
+		}
 	}
 
 	return 0;