netdev - Re: [PATCH net] net: accept an empty mask in /sys/class/net/*/queues/rx-*/rps

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Date:   Tue, 11 Aug 2020 20:27:13 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Maciej Żenczykowski <maze@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alex Belits <abelits@...vell.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH net] net: accept an empty mask in /sys/class/net/*/queues/rx-*/rps_cpus

On Tue, Aug 11, 2020 at 8:22 PM David Ahern <dsahern@...il.com> wrote:
>
> On 8/11/20 9:19 PM, Maciej Żenczykowski wrote:
> > Before breakage, post fix:
> >
> > sfp6:~# echo 0 > /sys/class/net/lo/queues/rx-0/rps_cpus
> >
> > With breakage:
> > lpk17:~# echo 0 > /sys/class/net/lo/queues/rx-0/rps_cpus
> > -bash: echo: write error: Invalid argument
> >
>
> ah, so this is recent breakage with 5.9. I had not hit before hence the
> question. thanks for clarifying.

Yup, 07bbecb34106 ("net: Restrict receive packets queuing to
housekeeping CPUs") has been merged only recently.

(This was not in David net-next tree btw, this is why it took us so
long to come to this issue)