netdev - Re: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba (updated) Version 2

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Date:	Sun, 24 Mar 2013 18:38:02 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"Huang, Xiong" <xiong@....qualcomm.com>,
	Sven Hartge <sven@...nhartge.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba (updated) Version 2

On Sun, Mar 24, 2013 at 10:22:48AM -0700, Eric Dumazet wrote:
> What could be tried is to remove the possibility of page spanning.
> 
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 441f5bf..d0f4dd1 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -1849,7 +1849,7 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
>  		kfree_skb(skb);
>  }
>  
> -#define NETDEV_FRAG_PAGE_MAX_ORDER get_order(32768)
> +#define NETDEV_FRAG_PAGE_MAX_ORDER 0
>  #define NETDEV_FRAG_PAGE_MAX_SIZE  (PAGE_SIZE << NETDEV_FRAG_PAGE_MAX_ORDER)
>  #define NETDEV_PAGECNT_MAX_BIAS	   NETDEV_FRAG_PAGE_MAX_SIZE

Doesn't change anything. :(

We tested it on a v3.8 kernel so I changed the definition in
net/core/skbuff.c. I hope this doesn't change the outcome.

Btw, reports about this bug are dating back to 2008 so I don't think
that a recent change in the kernel broke it.

Thanks,

  Hannes
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