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Re: [Iot-directorate] [Last-Call] Iotdir telechat review of draft-ietf-suit-information-model-08

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Wed, 02 December 2020 18:50 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, "iot-directorate@ietf.org" <iot-directorate@ietf.org>
CC: "draft-ietf-suit-information-model.all@ietf.org" <draft-ietf-suit-information-model.all@ietf.org>
Thread-Topic: [Last-Call] Iotdir telechat review of draft-ietf-suit-information-model-08
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Date: Wed, 02 Dec 2020 18:46:43 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/iot-directorate/K78pLUnRdUMSF7QCEO2C4TynjKI>
Subject: Re: [Iot-directorate] [Last-Call] Iotdir telechat review of draft-ietf-suit-information-model-08
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Thank you Stephen

I will use your review when balloting about this document for tomorrow telechat ;-)

Regards

-éric

-----Original Message-----
From: last-call <last-call-bounces@ietf.org> on behalf of Stephen Farrell via Datatracker <noreply@ietf.org>
Reply-To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Date: Wednesday, 2 December 2020 at 18:12
To: "iot-directorate@ietf.org" <iot-directorate@ietf.org>
Cc: "draft-ietf-suit-information-model.all@ietf.org" <draft-ietf-suit-information-model.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "suit@ietf.org" <suit@ietf.org>
Subject: [Last-Call] Iotdir telechat review of draft-ietf-suit-information-model-08

    Reviewer: Stephen Farrell
    Review result: Ready with Issues

    I think this is probably ready but wanted to just check one thing. The draft seems 
    overly prescriptive in some places. I think that's ok though as it's the CBOR spec 
    that'd affect interop so is where such issues should be addressed. Is that right? 
    If so, that's fine. If however, the MUSTs in this draft are supposed to be 
    slavishly followed then I think a non-trivial number of then are wrong. Just 
    to pick out a couple of examples:

    4.3.1: "Devices MUST reject manifests with sequence numbers smaller than any
    onboard sequence number." I'm not sure it's ok to rule out rollback without 
    a new manifest in all cases. Is there evidence that that is ok?

    4.3.6: Why MUST that location be explicit in the manifest? It could be an
    installation parameter in some cases, e.g. use SD card if present, else use
    on-board flash, and all might depend on space available and boot order
    settings.

    Note that even though I disagree with some of those MUSTs, the
    draft would still be fine and useful so long as those aren't taken too
    seriously:-)

    a couple of nits:

    abstract: s/must be present/can be present/ ?
    3.20: Expand XIP on 1st use



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