[PATCH v2] net/bonding: failover of LACP with mode 4 takes long time

[Gaoxiang Liu <gaoxiangliu0@163.com>]

When the primary port of bond slaves with bond mode 4 linked down,
the system id of the other slave ports channged.
It may cause some switches to renegotiate,
and the process takes a few seconds. It is not acceptable for any
Telcos.
We need sub-second switchover time like in linux.

Set the mac of the bond port to the slave port's system to solve the
problem.

Bugzilla ID: 551
Fixes: 46fb43683679 ("bond: add mode 4")
Cc: stable@dpdk.org

Signed-off-by: Gaoxiang Liu <liugaoxiang@huawei.com>

---
v2:
* Fixed compile issues.
---
 drivers/net/bonding/rte_eth_bond_8023ad.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_8023ad.c b/drivers/net/bonding/rte_eth_bond_8023ad.c
index b3cddd8a20..8d5486dad3 100644
--- a/drivers/net/bonding/rte_eth_bond_8023ad.c
+++ b/drivers/net/bonding/rte_eth_bond_8023ad.c
@@ -866,7 +866,6 @@ bond_mode_8023ad_periodic_cb(void *arg)
 	struct bond_dev_private *internals = bond_dev->data->dev_private;
 	struct port *port;
 	struct rte_eth_link link_info;
-	struct rte_ether_addr slave_addr;
 	struct rte_mbuf *lacp_pkt = NULL;
 	uint16_t slave_id;
 	uint16_t i;
@@ -893,7 +892,6 @@ bond_mode_8023ad_periodic_cb(void *arg)
 			key = 0;
 		}
 
-		rte_eth_macaddr_get(slave_id, &slave_addr);
 		port = &bond_mode_8023ad_ports[slave_id];
 
 		key = rte_cpu_to_be_16(key);
@@ -905,8 +903,8 @@ bond_mode_8023ad_periodic_cb(void *arg)
 			SM_FLAG_SET(port, NTT);
 		}
 
-		if (!rte_is_same_ether_addr(&port->actor.system, &slave_addr)) {
-			rte_ether_addr_copy(&slave_addr, &port->actor.system);
+		if (!rte_is_same_ether_addr(&internals->mode4.mac_addr, &port->actor.system)) {
+			rte_ether_addr_copy(&internals->mode4.mac_addr, &port->actor.system);
 			if (port->aggregator_port_id == slave_id)
 				SM_FLAG_SET(port, NTT);
 		}
@@ -1172,21 +1170,20 @@ void
 bond_mode_8023ad_mac_address_update(struct rte_eth_dev *bond_dev)
 {
 	struct bond_dev_private *internals = bond_dev->data->dev_private;
-	struct rte_ether_addr slave_addr;
 	struct port *slave, *agg_slave;
 	uint16_t slave_id, i, j;
 
 	bond_mode_8023ad_stop(bond_dev);
 
+	rte_eth_macaddr_get(internals->port_id, &internals->mode4.mac_addr);
 	for (i = 0; i < internals->active_slave_count; i++) {
 		slave_id = internals->active_slaves[i];
 		slave = &bond_mode_8023ad_ports[slave_id];
-		rte_eth_macaddr_get(slave_id, &slave_addr);
 
-		if (rte_is_same_ether_addr(&slave_addr, &slave->actor.system))
+		if (rte_is_same_ether_addr(&internals->mode4.mac_addr, &slave->actor.system))
 			continue;
 
-		rte_ether_addr_copy(&slave_addr, &slave->actor.system);
+		rte_ether_addr_copy(&internals->mode4.mac_addr, &slave->actor.system);
 		/* Do nothing if this port is not an aggregator. In other case
 		 * Set NTT flag on every port that use this aggregator. */
 		if (slave->aggregator_port_id != slave_id)
-- 
2.32.0