linux-kernel - Re: expected behavior of PF_PACKET on NETIF_F_HW_VLAN

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Date:	Wed, 31 Oct 2007 12:33:59 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Dave Johnson <djohnson+linux-kernel@...starentnetworks.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Bin Guo <bguo@...starentnetworks.com>
Subject: Re: expected behavior of PF_PACKET on NETIF_F_HW_VLAN_RX device?

On Wed, 31 Oct 2007 14:43:51 -0400
Dave Johnson <djohnson+linux-kernel@...starentnetworks.com> wrote:

> 
> Depending on the network driver, I'm seeing different behavior if
> a .1q packet is received to an PF_PACKET, SOCK_RAW, ETH_P_ALL socket.
> 
> 
> On devices what do not use NETIF_F_HW_VLAN_RX, the packet socket gets
> the complete packet with vlan tag included as the driver simply calls
> netif_receive_skb() or equivilant.  packet_rcv() then gets the whole
> thing vlan tag included and sends this through the socket.
> 
> vlan_skb_recv() also gets these all and will drop them because there
> are no vlans configured.
> 

The VLAN acceleration grabs and hides the tag. It is a design flaw
that should be fixed, feel free to post a patch.


-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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