From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: RFC: Enabling ethernet drivers to return FCS in the skb? Date: Mon, 17 Nov 2003 13:52:17 -0800 Sender: netdev-bounce@oss.sgi.com Message-ID: <3FB94311.10004@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: To: "'netdev@oss.sgi.com'" Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org Ethereal now has the ability to decode (and check) the FCS for ethernet frames (assuming it understands the protocol so it can determine that the last 4 bytes are FCS). 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. This could be a separate flag if desired, but if only good FCS will ever be passed up the stack, then having it in the skb does not really add new information. At least some hardware appears to support receiving bad FCS frames (e1000, evidently), but I am not sure how wide-spread this feature is... Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com