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Re: [tsvwg] RDMA Support by UDP FRAG Option

"C. M. Heard" <heard@pobox.com> Sat, 19 June 2021 18:01 UTC

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From: "C. M. Heard" <heard@pobox.com>
Date: Sat, 19 Jun 2021 11:00:48 -0700
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To: Tom Herbert <tom@herbertland.com>
Cc: Gorry Fairhurst <gorry@erg.abdn.ac.uk>, Joseph Touch <touch@strayalpha.com>, TSVWG <tsvwg@ietf.org>
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Subject: Re: [tsvwg] RDMA Support by UDP FRAG Option
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On Sat, Jun 19, 2021 at 10:11 AM Tom Herbert wrote:

> There is another serious problem with transport checksums and use of
> the UDP surplus area. Most of this discussion has presumed that the
> UDP checksum is the one in the packet being offloaded, but that may
> not be the case. Consider the case where a sender sends a TCP packet
> that is encapsulated GRE/UDP or VXLAN (a very common use case in
> virtual networks where VMs send packets on their virtual networks).
>

Is there a use case for employing UDP options with GRE/UDP? Or GUE?

Mike Heard

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