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Date:	Wed, 07 Nov 2012 18:55:13 -0500 (EST)
From:	David Miller <>
Subject: Re: [PATCH net-next v3] packet: tx_ring: allow the user to choose
 tx data offset

From: Paul Chavent <>
Date: Wed,  7 Nov 2012 10:10:47 +0100

> The tx data offset of packet mmap tx ring used to be :
> (TPACKET2_HDRLEN - sizeof(struct sockaddr_ll))
> The problem is that, with SOCK_RAW socket, the payload (14 bytes after
> the beginning of the user data) is misaligned.
> This patch allows to let the user gives an offset for it's tx data if
> he desires.
> Set sock option PACKET_TX_HAS_OFF to 1, then specify in each frame of
> your tx ring tp_net for SOCK_DGRAM, or tp_mac for SOCK_RAW.
> Signed-off-by: Paul Chavent <>

Applied, thanks.
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