On Mon, Jun 10, 2019 at 02:28:10PM -0700, David Miller wrote: > From: Govindarajulu Varadarajan <gvara...@cisco.com> > Date: Mon, 10 Jun 2019 07:27:02 -0700 > > > When stack receives pkt: [802.1P vlan 0][802.1AD vlan 100][IPv4], > > vlan_do_receive() returns false if it does not find vlan_dev. Later > > __netif_receive_skb_core() fails to find packet type handler for > > skb->protocol 801.1AD and drops the packet. > > > > 801.1P header with vlan id 0 should be handled as untagged packets. > > This patch fixes it by checking if vlan_id is 0 and processes next vlan > > header. > > > > Signed-off-by: Govindarajulu Varadarajan <gvara...@cisco.com> > > Under Linux we absolutely do not decapsulate the VLAN protocol unless > a VLAN device is configured on that interface.
VLAN ID 0 is treated as if the VLAN protocol isn't there. It is used so that the 802.1 priority bits can be encoded and acted upon.
