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

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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: 2a654540be ("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>
This commit is contained in:
Shannon Nelson 2021-10-08 12:38:01 -07:00 committed by Greg Kroah-Hartman
parent f33890d9bb
commit 3593fa147c
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/pensando/ionic/ionic_lif.c
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@ -1096,6 +1096,10 @@ static int ionic_ndo_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, true);
}