Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:SuggestedFragmentation/Reassemblytext

"Black, David" <David.Black@dell.com> Wed, 24 March 2021 00:18 UTC

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From: "Black, David" <David.Black@dell.com>
To: Bob Briscoe <ietf@bobbriscoe.net>, Jonathan Morton <chromatix99@gmail.com>
CC: Markku Kojo <kojo@cs.helsinki.fi>, Joe Touch <touch@strayalpha.com>, Markku Kojo <kojo=40cs.helsinki.fi@dmarc.ietf.org>, "tsvwg-chairs@ietf.org" <tsvwg-chairs@ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>, "Black, David" <David.Black@dell.com>
Thread-Topic: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:SuggestedFragmentation/Reassemblytext
Thread-Index: AQHXHoHzyRB0KbbvNUGu9Uh71MX8MKqQe7AAgAG3UwCAABXlkA==
Date: Wed, 24 Mar 2021 00:17:46 +0000
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Subject: Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:SuggestedFragmentation/Reassemblytext
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Bob,

Ok, that revised text works for me … good catch, thanks.  Onward to the ecn-encap draft …

Thanks, --David

From: Bob Briscoe <ietf@bobbriscoe.net>
Sent: Tuesday, March 23, 2021 6:58 PM
To: Black, David; Jonathan Morton
Cc: Markku Kojo; Joe Touch; Markku Kojo; tsvwg-chairs@ietf.org; tsvwg@ietf.org
Subject: Re: [tsvwg] draft-ietf-tsvwg-rfc6040update-shim:SuggestedFragmentation/Reassemblytext


[EXTERNAL EMAIL]
David,

I'll reply to your response on the shim text here, and start a new thread for the encap draft, to keep this from growing too long...
On 22/03/2021 22:00, Black, David wrote:

First, the good news - the reassembly text in Section 5 of rfc6040update-shim

draft looks good:



   Section 5.3 of [RFC3168] defines the process that a tunnel egress

   follows to reassemble sets of outer fragments

   [I-D.ietf-intarea-tunnels] into packets.



   During reassembly of outer fragments [I-D.ietf-intarea-tunnels], if

   the ECN fields of the outer headers being reassembled into a single

   packet consist of a mixture of Not-ECT and other ECN codepoints, the

   packet MUST be discarded.



   If there is mix of ECT(0) and ECT(1) fragments, then the reassembled

   packet MUST be set to either ECT(0) or ECT(1).  In this case,

   reassembly SHOULD take into account that the RFC series has so far

   ensured that ECT(0) and ECT(1) can either be considered equivalent,

   or they can provide 2 levels of congestion severity, where the

   ranking of severity from highest to lowest is CE, ECT(1), ECT(0)

   [RFC6040].



I would slightly rephrase the first paragraph as follows:



   Section 5.3 of [RFC3168] specifies ECN requirements for tunnel egress

   reassembly of sets of outer fragments [I-D.ietf-intarea-tunnels] into IP packets

   when at least one of the fragments is CE-marked.  If none of the fragments

   in a set to be reassembled is CE-marked, then the following two additional

   requirements apply:

[BB] I'm afraid that's incorrect. This requirements from RFC3168 covers cases other than those with at least one CE fragment:

   "Reassembly of

   a fragmented packet MUST NOT change the ECN codepoint when all of the

   fragments carry the same codepoint."

To achieve what you want, I believe i just need to replace the first para with the following, then bullet paras 2 & 3:

   Section 5.3 of [RFC3168] specifies ECN requirements for reassembly of

   sets of outer fragments [I-D.ietf-intarea-tunnels] into packets.  The

   following two additional requirements apply at a tunnel egress:

Also, we agreed that we would not update RFC3168 here. This section starts by saying it updates RFC6040, so I've kept it to just that (my draft-13 text was wrong in this respect too). I've moved the words "...at a tunnel egress" so they confine the scope of this update to a tunnel egress, rather than incorrectly redefining the scope of RFC3168 (which is about reassembly anywhere, not just "...at a tunnel egress:")







and then itemize the second and third paragraphs (e.g., number them 1. and 2.).



The rationale for this rephrasing is that Section 5.3 of RFC 3168 does not specify

a process, but rather imposes requirements on what is allowed.  I also believe

that this text the bulk of what's needed to address the reassembly comment

that's been holding up these drafts.



---------------------------------
See new thread for the rest about ecn-encap...


Bob


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________________________________________________________________

Bob Briscoe                               http://bobbriscoe.net/