From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rask Ingemann Lambertsen Subject: Re: RFC: Enabling ethernet drivers to return FCS in the skb? Date: Wed, 19 Nov 2003 12:35:57 +0100 Sender: netdev-bounce@oss.sgi.com Message-ID: <20031119123556.A7622@sygehus.dk> References: <3FB94311.10004@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: To: "'netdev@oss.sgi.com'" Content-Disposition: inline In-Reply-To: <3FB94311.10004@candelatech.com>; from greearb@candelatech.com on Mon, Nov 17, 2003 at 01:52:17PM -0800 Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On Mon, Nov 17, 2003 at 01:52:17PM -0800, Ben Greear wrote: > Is there any interest in adding an Ethtool command to tell the driver to > push the extra 4 bytes of CSUM into the skb? > > When enabling this feature, I'd also like to allow drivers to receive > frames with bad FCS as well. [cut] > At least some hardware appears > to support receiving bad FCS frames (e1000, evidently), but I am not sure > how wide-spread this feature is... The Intel i82586 and i82596 and can be told to receive frames with a bad FCS. They can also be told to send a precomputed FCS rather than computing it on the fly. The i82596 and tulip can also transfer the FCS to memory when receiving frames. I guess all of this is also supported on the i82557/8/9. -- Regards, Rask Ingemann Lambertsen