netdev - Re: [PATCH] tcp: fix tcp_md5_hash_skb

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Date:	Tue, 14 May 2013 11:33:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, mischnal@...gle.com, bbeck@...gle.com
Subject: Re: [PATCH] tcp: fix tcp_md5_hash_skb_data()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 14 May 2013 00:25:52 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> TCP md5 communications fail [1] for some devices, because sg/crypto code
> assume page offsets are below PAGE_SIZE.
> 
> This was discovered using mlx4 driver [2], but I suspect loopback
> might trigger the same bug now we use order-3 pages in tcp_sendmsg()
> 
> [1] Failure is giving following messages.
> 
> huh, entered softirq 3 NET_RX ffffffff806ad230 preempt_count 00000100,
> exited with 00000101?
> 
> [2] mlx4 driver uses order-2 pages to allocate RX frags
> 
> Reported-by: Matt Schnall <mischnal@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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