netdev - Re: [PATCH] af-packet: Add flag to distinguish VID 0 from no-vlan.

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Date:	Thu, 26 May 2011 16:19:30 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] af-packet: Add flag to distinguish VID 0 from no-vlan.

From: greearb@...delatech.com
Date: Wed, 25 May 2011 16:36:35 -0700

> From: Ben Greear <greearb@...delatech.com>
> 
> Currently, user-space cannot determine if a 0 tcp_vlan_tci
> means there is no VLAN tag or the VLAN ID was zero.
> 
> Add flag to make this explicit.  User-space can check for
> TP_STATUS_VLAN_VALID || tp_vlan_tci > 0, which will be backwards
> compatible. Older could would have just checked for tp_vlan_tci,
> so it will work no worse than before.
> 
> Signed-off-by: Ben Greear <greearb@...delatech.com>

Please do this in tpacket_rcv() too, otherwise the feature
bit won't be available to mmap() users of AF_PACKET.

Thanks.
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