Date: Thu, 01 Nov 2007 15:07:23 -0700 (PDT)
Message-Id: <20071101.150723.30590053.davem@davemloft.net>
To: rick.jones2@hp.com
Cc: djohnson+linux-kernel@sw.starentnetworks.com, greearb@candelatech.com,
       shemminger@linux-foundation.org, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org, bguo@sw.starentnetworks.com
Subject: Re: expected behavior of PF_PACKET on NETIF_F_HW_VLAN_RX device?
From: David Miller <davem@davemloft.net>
In-Reply-To: <472A4D5C.2070301@hp.com>
References: <472A49BD.6000802@hp.com>
	<20071101.145956.63020380.davem@davemloft.net>
	<472A4D5C.2070301@hp.com>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 970
Lines: 29

From: Rick Jones <rick.jones2@hp.com>
Date: Thu, 01 Nov 2007 15:04:12 -0700

> David Miller wrote:
> > From: Rick Jones <rick.jones2@hp.com>
> > Date: Thu, 01 Nov 2007 14:48:45 -0700
> > 
> > 
> >>One could I suppose try to ammend the information passed to allow
> >>tcpdump to say "oh, this was a tx packet on the same machine on
> >>which I am tracing so don't worry about checksum mismatch"
> > 
> > 
> > We do this already!
> 
> I'll try to go pester folks in tcpdump-workers then.

The thing to check is "TP_STATUS_CSUMNOTREADY".

When using mmap(), it will be provided in the descriptor.  When using
recvmsg() it will be provided via a PACKET_AUXDATA control message
when enabled via the PACKET_AUXDATA socket option.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/