RE: [E1000-devel] Priority bits information

[Feldman, S. <sco...@in...>]

> Would it be possible to retreive 802.1p priority bits from=20
> the received packets in the e1000 driver? I am considering=20
> adding some queueing mechanism to a linux router that can=20
> honor priority information in the VLAN header.
> Are those bits present (in the e1000_rx_desc.special) ?

The e1000 hardware strips the VLAN/priority tag before handing the
packet to the driver.  You could turn off hardware VLAN support, and
then the driver will hand up a skb with packet data that includes the
VLAN/priority tag.  To turn it off:

                netdev->features =3D NETIF_F_SG |
                                   NETIF_F_HW_CSUM |
-                                  NETIF_F_HW_VLAN_TX |
-                                  NETIF_F_HW_VLAN_RX |
                                   NETIF_F_HW_VLAN_FILTER;

What happens to the skb after the driver hands it to the stack is
something you'll need to chase down.

-scott