netdev - Re: [PATCH v2 iproute2-next 09/10] tc/mqprio: add support for preemptible traffic classes

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Message-ID: <20230429174255.564a9401@hermes.local>
Date:   Sat, 29 Apr 2023 17:42:55 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH v2 iproute2-next 09/10] tc/mqprio: add support for
 preemptible traffic classes

On Tue, 18 Apr 2023 14:39:52 +0300
Vladimir Oltean <vladimir.oltean@....com> wrote:

> +	tc = rta_getattr_u32(tb[TCA_MQPRIO_TC_ENTRY_INDEX]);
> +	/* Prevent array out of bounds access */
> +	if (tc >= TC_QOPT_MAX_QUEUE) {
> +		fprintf(stderr, "Unexpected tc entry index %d\n", tc);
> +		return;
> +	}

This creates a ABI dependency, what if kernel config changes?