This is a new version of remote checksum offload, the primary difference from 00 is that the offsets are now relative to the end of the encapsulation header instead of the beginning.
Remote checksum offload is supported in GUE in upstream Linux (will be in 3.18, http://www.spinics.net/lists/netdev/msg302554.html). VXLAN experts: I would like to implement this in VXLAN also. I think the option could be compressed to 8 bits. Would it make sense to use an available reserved bit (maybe call it for private use) and put the data in the low order eight bits of vni field? Thanks, Tom ---------- Forwarded message ---------- From: <internet-dra...@ietf.org> Date: Thu, Nov 13, 2014 at 12:19 AM Subject: New Version Notification for draft-herbert-remotecsumoffload-01.txt To: Tom Herbert <therb...@google.com> A new version of I-D, draft-herbert-remotecsumoffload-01.txt has been successfully submitted by Tom Herbert and posted to the IETF repository. Name: draft-herbert-remotecsumoffload Revision: 01 Title: Remote checksum offload for encapsulation Document date: 2014-11-12 Group: Individual Submission Pages: 11 URL: http://www.ietf.org/internet-drafts/draft-herbert-remotecsumoffload-01.txt Status: https://datatracker.ietf.org/doc/draft-herbert-remotecsumoffload/ Htmlized: http://tools.ietf.org/html/draft-herbert-remotecsumoffload-01 Diff: http://www.ietf.org/rfcdiff?url2=draft-herbert-remotecsumoffload-01 Abstract: This specification describes remote checksum offload, which is a mechanism that provides checksum offload of transport checksums in encapsulated packets using rudimentary offload capabilities found in most Network Interface Card (NIC) devices. The outer header checksum (e.g. that in UDP or GRE) is enabled in packets and, with some additional meta information, a receiver is able to deduce the checksum to be set in an encapsulated packet. Effectively this offloads the computation of the inner checksum. Enabling the outer checksum in encapsulation has the additional advantage that it covers more of the packet than the inner checksum including the encapsulation headers. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat _______________________________________________ nvo3 mailing list nvo3@ietf.org https://www.ietf.org/mailman/listinfo/nvo3
