netdev - Re: expected behavior of PF_PACKET on NETIF_F_HW_VLAN

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Message-ID: <4729EAFF.9050606@candelatech.com>
Date:	Thu, 01 Nov 2007 08:04:31 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	David Miller <davem@...emloft.net>
CC:	shemminger@...ux-foundation.org,
	djohnson+linux-kernel@...starentnetworks.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	bguo@...starentnetworks.com
Subject: Re: expected behavior of PF_PACKET on NETIF_F_HW_VLAN_RX device?

David Miller wrote:
> From: Stephen Hemminger <shemminger@...ux-foundation.org>
> Date: Wed, 31 Oct 2007 18:23:37 -0700
>
>   
>> The code in AF_PACKET should fix the skb before passing to user
>> space so that there is no difference between accel and non-accel
>> hardware.  Internal choices shouldn't leak to user space.  Ditto,
>> the receive checksum offload should be fixed up as well.
>>     
>
> The hardware has stripped the VLAN header completely and has not
> provided it to us at all.
>   
Do the NICs not save the QoS bits in the VLAN header anywhere that we could
use to reconstitute the header?

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com> 
Candela Technologies Inc  http://www.candelatech.com


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