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

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Date: Mon, 4 Dec 2023 08:51:50 -0700
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>,
 Stephen Hemminger <stephen@...workplumber.org>
Cc: "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 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?