netdev - Re: [PATCH net] tun: remove bogus hardware vlan acceleration flags from vlan

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Date:	Thu, 20 Feb 2014 02:16:49 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	makita.toshiaki@....ntt.co.jp
Cc:	fernando@....ntt.co.jp, maxk@....qualcomm.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net] tun: remove bogus hardware vlan acceleration flags
 from vlan_features

From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Date: Tue, 18 Feb 2014 21:20:09 +0900

> From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
> 
> Even though only the outer vlan tag can be HW accelerated in the transmission
> path, in the TUN/TAP driver vlan_features mirrors hw_features, which happens
> to have the NETIF_F_HW_VLAN_?TAG_TX flags set. Because of this, during packet
> tranmisssion through a stacked vlan device dev_hard_start_xmit, (incorrectly)
> assuming that the vlan device supports hardware vlan acceleration, does not
> add the vlan header to the skb payload and the inner vlan tags are lost
> (vlan_tci contains the outer vlan tag when userspace reads the packet from
> the tap device).
> 
> Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>

Applied and queued up for -stable.
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