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add support of IFF_XMIT_DST_RELEASE bit in vlan

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Some time ago Eric Dumazet suggested a "hack the IFF_XMIT_DST_RELEASE
flag on the vlan netdev". But the last comment was "does not support
properly bonding/team.(If the real_dev->privflags IFF_XMIT_DST_RELEASE
bit changes, we want to update all the vlans at the same time )"

I've extended that patch to support changes of IFF_XMIT_DST_RELEASE in
bonding/team.
Both bonding and team call netdev_change_features() after recalculation
of features including priv_flags IFF_XMIT_DST_RELEASE bit. So the only
thing needed to support is to recheck this bit in
vlan_transfer_features().

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Vadim Fedorenko <vfedorenko@yandex-team.ru>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vadim Fedorenko 2017-11-02 15:49:08 +03:00 committed by David S. Miller
parent 1ec6e53029
commit 9d917c207d
2 changed files with 4 additions and 0 deletions
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3
net/8021q/vlan.c
View file

@ -328,6 +328,9 @@ static void vlan_transfer_features(struct net_device *dev,
vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
#endif
vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
netdev_update_features(vlandev);
}

1
net/8021q/vlan_netlink.c
View file

@ -143,6 +143,7 @@ static int vlan_newlink(struct net *src_net, struct net_device *dev,
vlan->vlan_proto = proto;
vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
vlan->real_dev = real_dev;
dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
vlan->flags = VLAN_FLAG_REORDER_HDR;
err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);