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Re: [tcpm] AccECN field order

Joseph Touch <touch@strayalpha.com> Wed, 27 January 2021 17:19 UTC

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From: Joseph Touch <touch@strayalpha.com>
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Date: Wed, 27 Jan 2021 09:19:26 -0800
Cc: Vidhi Goel <vidhi_goel=40apple.com@dmarc.ietf.org>, Michael Tuexen <tuexen@fh-muenster.de>, tcpm IETF list <tcpm@ietf.org>, Mirja Kuehlewind <ietf@kuehlewind.net>, "tcpm-chairs@ietf.org" <tcpm-chairs@ietf.org>
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To: "Scheffenegger, Richard" <Richard.Scheffenegger@netapp.com>
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Subject: Re: [tcpm] AccECN field order
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> On Jan 27, 2021, at 1:43 AM, Scheffenegger, Richard <Richard.Scheffenegger@netapp.com> wrote:
> 
> Just for clarity, the suggestion would be something like:
> 
> Kind | Length | 1-bit ordering == 0 | 23-bit EE1B [ | 24-bit ECEB [ | 24-bit EE0B ] ]
> And
> Kind | Length | 1-bit ordering == 1 | 23-bit EE0B [ | 24-bit ECEB [ | 24-bit EE1B ] ]
> 
> With the two trailing 3-octet fields being optional in both cases.
> 
> An increment in the CE counter would require at least 1+1+3+3 = 8 byte TCP option space.

It would anyway unless we’re now talking about three TCP codepoints.

Strictly, if only the CE counter changed, that could be accomplished using only 5 bytes by adding another variant, determined by the length being 5:

Kind | Length | 24-bit ECEB

At some point, the flexibility in this option needs to be supported within the option itself.

Joe

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