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 04:54:46 +0000
From:	"Huang, Xiong" <xiong@....qualcomm.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
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


> 
> >
> > 	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?
> 
Not dual-use.  You could check  flags for corrupted packets and compare it with good packet.
Your corrupted packet is just TCP checksum error ?

Thanks
Xiong