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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Message-ID: <20130324043738.GD17948@order.stressinduktion.org>
Date:	Sun, 24 Mar 2013 05:37:38 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"Huang, Xiong" <xiong@....qualcomm.com>
Cc:	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 04:21:27AM +0000, Huang, Xiong wrote:
> I know that from some version of chips, there is a DMA bug that can't be fixed by software, and this bug could be detected by checking Sequence number, and do MAC reset.
> Besides, the chip wrongly indicate rx-checksum for IP-fragment packet, I checked windows code, it seems a little bit different with linux code:

Thanks, I will have a closer look at it tomorrow.

> 
> 	if (((pkt_flags & RRS_IS_IPV4) && ((pkt_flags & RRS_IS_TCP) || (pkt_flags & RRS_IS_UDP))) {
> 		if (pkt_flags & RRS_IS_802_3)
> 			head_len += 8;
> 		iph = (struct iphdr *) (packet + head_len);
> 		if ((iph->frag_off != 0 || (pkt_flags & RRS_IS_IP_FRAG))  && !(pkt_flags & RRS_IS_IP_DF))
> 			goto hw_xsum;			
> 	}
> 	if (!(err_flags & (RRS_ERR_IP_CSUM | RRS_ERR_L4_CSUM))) {
> 		skb->ip_summed = CHECKSUM_UNNECESSARY;
> 		return;
> 	}

Btw the captured corrupted packets are ordinary non-fragmented TCP IPv4
packets. But perhaps these flags are dual-use?

Thanks for looking into it,

  Hannes

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