netdev - TX_RING and VLAN : (packet size is too long 1518

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Message-ID: <5309D59A.1020304@fokus.fraunhofer.de>
Date:	Sun, 23 Feb 2014 12:03:54 +0100
From:	Mathias Kretschmer <mathias.kretschmer@...us.fraunhofer.de>
To:	<dborkman@...hat.com>
CC:	<jbrouer@...hat.com>, <netdev@...r.kernel.org>
Subject: TX_RING and VLAN : (packet size is too long 1518 > 1514)

Hi Daniel, all

we're running into the above error when sending full-sized VLAN-tagged 
frames via TX_RING (Kernel 3.10.31, but same code seems to be present in 
3.14).

For the regular send() calls, there seems to be code in place to handle 
VLAN-tagged frames, but in tpacket_fill_skb() there is no such check.

I came up with fix for this, but can only verify this tomorrow.
If it works, I'd send you a patch, but someone with more insights into 
the networking code should probably fix this properly ;-)

Cheers,

Mathias
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