Commit 32d2ce0b authored Oct 08, 2021 by Shannon Nelson Committed by Greg Kroah-Hartman Oct 20, 2021

ionic: don't remove netdev->dev_addr when syncing uc list



commit 5c976a56570f29aaf4a2f9a1bf99789c252183c9 upstream.

Bridging, and possibly other upper stack gizmos, adds the
lower device's netdev->dev_addr to its own uc list, and
then requests it be deleted when the upper bridge device is
removed.  This delete request also happens with the bridging
vlan_filtering is enabled and then disabled.

Bonding has a similar behavior with the uc list, but since it
also uses set_mac to manage netdev->dev_addr, it doesn't have
the same the failure case.

Because we store our netdev->dev_addr in our uc list, we need
to ignore the delete request from dev_uc_sync so as to not
lose the address and all hope of communicating.  Note that
ndo_set_mac_address is expressly changing netdev->dev_addr,
so no limitation is set there.

Fixes: 2a654540 ("ionic: Add Rx filter and rx_mode ndo support")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent abaf8e8b

drivers/net/ethernet/pensando/ionic/ionic_lif.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -912,6 +912,10 @@ static int ionic_addr_add(struct net_device netdev, const u8 addr)

		static int ionic_addr_del(struct net_device netdev, const u8 addr)
		{
		/* Don't delete our own address from the uc list */
		if (ether_addr_equal(addr, netdev->dev_addr))
		return 0;

		return ionic_lif_addr(netdev_priv(netdev), addr, false);
		}