linux-kernel - Re: [PATCH] Clear IFF_XMIT_DST

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Date:	Wed, 16 Jun 2010 09:25:45 -0400
From:	jamal <hadi@...erus.ca>
To:	Tom Hughes <tom@...pton.nu>
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Clear IFF_XMIT_DST_RELEASE for teql interfaces

On Wed, 2010-06-16 at 09:24 +0100, Tom Hughes wrote:
> The sch_teql module, which can be used to load balance over a set of
> underlying interfaces, stopped working after 2.6.30 and has been
> broken in all kernels since then for any underlying interface which
> requires the addition of link level headers.
> 
> The problem is that the transmit routine relies on being able to
> access the destination address in the skb in order to do address
> resolution once it has decided which underlying interface it is going
> to transmit through.
> 
> In 2.6.31 the IFF_XMIT_DST_RELEASE flag was introduced, and set by
> default for all interfaces, which causes the destination address to be
> released before the transmit routine for the interface is called.
> 
> The solution is to clear that flag for teql interfaces.
> 
> Signed-off-by: Tom Hughes <tom@...pton.nu>

Sounds reasonable. Lets CC Eric and get his ACK.

cheers,
jamal

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