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[tsvwg] Re: TSVWG Adoption Call for draft-duke-tsvwg-udp-ecn-03 as Informational, ending on 29th November 2024

Greg White <g.white@CableLabs.com> Wed, 13 November 2024 19:29 UTC

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From: Greg White <g.white@CableLabs.com>
To: Gorry Fairhurst <gorry@erg.abdn.ac.uk>, "tsvwg@ietf.org" <tsvwg@ietf.org>
Thread-Topic: [tsvwg] TSVWG Adoption Call for draft-duke-tsvwg-udp-ecn-03 as Informational, ending on 29th November 2024
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Date: Wed, 13 Nov 2024 19:29:26 +0000
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Subject: [tsvwg] Re: TSVWG Adoption Call for draft-duke-tsvwg-udp-ecn-03 as Informational, ending on 29th November 2024
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I also support the adoption of this draft.

Similar to some other comments, I do wonder about potential evolution of the APIs, and how that will be handled given the RFC process.
Perhaps the document could explicitly list the OS version(s) that the material applies to.

On terminology, I noticed the statement in Section 3: “Network devices can change the ECN bits in the IP header.”
This should be “Network devices can change the ECN codepoint in the IP header.” and it would be worth pointing to RFC3168 and RFC9331 regarding the allowed transitions that are expected to occur.
I’ve noticed that even some current vendor documentation refers to the obsolete RFC2481 definition of the “ECT bit” and the “CE bit” as opposed to the “ECN Field” and its codepoints.

-Greg


From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
Organization: UNIVERSITY OF ABERDEEN
Date: Tuesday, November 12, 2024 at 11:57 PM
To: "tsvwg@ietf.org" <tsvwg@ietf.org>
Subject: [tsvwg] TSVWG Adoption Call for draft-duke-tsvwg-udp-ecn-03 as Informational, ending on 29th November 2024

Hello TSV WG,

This is a formal adoption call that will run 2 weeks, ending on 29th
November 2024. Please respond to this email thread with any comments
indicating support or objection to adopting this draft as a basis for
work on ECN support for UDP.

During IETF-121, the WG discussed "Configuring UDP Sockets for ECN for
Common Platforms" (draft-duke-tsvwg-udp-ecn)  and the sense in the room
indicated some support for adoption, this email provides an opportunity
to contribute comments on this planned work.

Best wishes,
Gorry and Marten
(tsvwg co-chairs)

See:
https://datatracker.ietf.org/doc/draft-duke-tsvwg-udp-ecn/

Abstract

   Explicit Congestion Notification (ECN) applies to all transport

   protocols in principle.  However, it had limited deployment for UDP

   until QUIC became widely adopted.  As a result, documentation of UDP

   socket APIs for ECN on various platforms is sparse.  This document

   records the results of experimenting with these APIs in order to get

   ECN working on UDP for Chromium on Apple, Linux, and Windows

   platforms.

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