netdev - Re: [PATCH net-next] fq_codel: generalise ce_threshold marking for subset of traffic

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Date:   Tue, 19 Oct 2021 19:35:56 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] fq_codel: generalise ce_threshold marking for
 subset of traffic

Eric Dumazet <edumazet@...gle.com> writes:

> On Tue, Oct 19, 2021 at 10:17 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>>
>> The commit in the Fixes tag expanded the ce_threshold feature of FQ-CoDel
>> so it can be applied to a subset of the traffic, using the ECT(1) bit of
>> the ECN field as the classifier. However, hard-coding ECT(1) as the only
>> classifier for this feature seems limiting, so let's expand it to be more
>> general.
>>
>> To this end, change the parameter from a ce_threshold_ect1 boolean, to a
>> one-byte selector/mask pair (ce_threshold_{selector,mask}) which is applied
>> to the whole diffserv/ECN field in the IP header. This makes it possible to
>> classify packets by any value in either the ECN field or the diffserv
>> field. In particular, setting a selector of INET_ECN_ECT_1 and a mask of
>> INET_ECN_MASK corresponds to the functionality before this patch, and a
>> mask of ~INET_ECN_MASK allows using the selector as a straight-forward
>> match against a diffserv code point.
>
> Please include what command line should be used once we get iproute2
> support.

Sure, will add that and send a v2

-Toke