bonding: update port speed when getting bond speed

Andrew reported a bonding issue that if we put an active-back bond on top
of a 802.3ad bond interface. When the 802.3ad bond's speed/duplex changed
dynamically. The upper bonding interface's speed/duplex can't be changed at
the same time, which will show incorrect speed.

Fix it by updating the port speed when calling ethtool.
Reported-by: Andrew Schorr <ajschorr@alumni.princeton.edu>
Closes: https://lore.kernel.org/netdev/ZEt3hvyREPVdbesO@Laptop-X1/Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Link: https://lore.kernel.org/r/20230821101008.797482-1-liuhangbin@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/bonding/bond_main.c

@@ -5718,6 +5718,7 @@ static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
 	 */
 	bond_for_each_slave(bond, slave, iter) {
 		if (bond_slave_can_tx(slave)) {
+			bond_update_speed_duplex(slave);
 			if (slave->speed != SPEED_UNKNOWN) {
 				if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
 					speed = bond_mode_bcast_speed(slave,