netdev - Re: TCP-MD5 checksum failure on x86

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Message-Id: <20100516.003719.62329711.davem@davemloft.net>
Date:	Sun, 16 May 2010 00:37:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	bhaskie@...il.com, shemminger@...tta.com,
	bhutchings@...arflare.com, netdev@...r.kernel.org
Subject: Re: TCP-MD5 checksum failure on x86_64 SMP

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 07 May 2010 23:18:57 +0200

> [PATCH] net: Introduce sk_route_nocaps
> 
> TCP-MD5 sessions have intermittent failures, when route cache is
> invalidated. ip_queue_xmit() has to find a new route, calls
> sk_setup_caps(sk, &rt->u.dst), destroying the 
> 
> sk->sk_route_caps &= ~NETIF_F_GSO_MASK
> 
> that MD5 desperately try to make all over its way (from
> tcp_transmit_skb() for example)
> 
> So we send few bad packets, and everything is fine when
> tcp_transmit_skb() is called again for this socket.
> 
> Since ip_queue_xmit() is at a lower level than TCP-MD5, I chose to use a
> socket field, sk_route_nocaps, containing bits to mask on sk_route_caps.
> 
> Reported-by: Bhaskar Dutta <bhaskie@...il.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Since the connection does recover eventually, I'm stuffing this into
net-next-2.6 into net-2.6

After some time in net-next-2.6, we can submit it to -stable.
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