netdev - Re: [PATCH iproute2 3/5] tc: fq: add TCA_FQ

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Date: Mon, 4 Dec 2023 16:55:22 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: David Ahern <dsahern@...nel.org>
Cc: Stephen Hemminger <stephen@...workplumber.org>, "David S . Miller" <davem@...emloft.net>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Neal Cardwell <ncardwell@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH iproute2 3/5] tc: fq: add TCA_FQ_PRIOMAP handling

On Mon, Dec 4, 2023 at 4:51 PM David Ahern <dsahern@...nel.org> wrote:
>
> On 12/4/23 2:19 AM, Eric Dumazet wrote:
> > @@ -193,6 +196,48 @@ static int fq_parse_opt(struct qdisc_util *qu, int argc, char **argv,
> >                       pacing = 1;
> >               } else if (strcmp(*argv, "nopacing") == 0) {
> >                       pacing = 0;
> > +             } else if (strcmp(*argv, "bands") == 0) {
> > +                     int idx;
> > +
> > +                     if (set_priomap) {
> > +                             fprintf(stderr, "Duplicate \"bands\"\n");
> > +                             return -1;
> > +                     }
> > +                     memset(&prio2band, 0, sizeof(prio2band));
> > +                     NEXT_ARG();
> > +                     if (get_integer(&prio2band.bands, *argv, 10)) {
> > +                             fprintf(stderr, "Illegal \"bands\"\n");
> > +                             return -1;
> > +                     }
> > +                     if (prio2band.bands != 3) {
> > +                             fprintf(stderr, "\"bands\" must be 3\n");
> > +                             return -1;
> > +                     }
>
> do you expect number of bands to change in the future? If not, why make
> it an option or just a flag?

We do not know yet if this would in the future (we have not changed it
in the last ~9 years)

I used the same syntax as prio which would allow a future change if needed.