From: peterz@infradead.org
To: "Maciej Żenczykowski" <maze@google.com>
Cc: Eric Dumazet <edumazet@google.com>,
"David S . Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
Eric Dumazet <eric.dumazet@gmail.com>,
Alex Belits <abelits@marvell.com>,
Nitesh Narayan Lal <nitesh@redhat.com>
Subject: Re: [PATCH net] net: accept an empty mask in /sys/class/net/*/queues/rx-*/rps_cpus
Date: Wed, 12 Aug 2020 10:00:49 +0200 [thread overview]
Message-ID: <20200812080049.GH2674@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CANP3RGc6Gz73Gt3v9M7KYNeNd57o--=3mF6yqdRjqOViG+TG7A@mail.gmail.com>
On Tue, Aug 11, 2020 at 06:45:23PM -0700, Maciej Żenczykowski wrote:
> On Tue, Aug 11, 2020 at 6:34 PM Eric Dumazet <edumazet@google.com> wrote:
>
> > We must accept an empty mask in store_rps_map(), or we are not able
> > to disable RPS on a queue.
> >
> > Fixes: 07bbecb34106 ("net: Restrict receive packets queuing to
> > housekeeping CPUs")
> > Signed-off-by: Eric Dumazet <edumazet@google.com>
> > Reported-by: Maciej Żenczykowski <maze@google.com>
> > Cc: Alex Belits <abelits@marvell.com>
> > Cc: Nitesh Narayan Lal <nitesh@redhat.com>
> > Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> > ---
> > net/core/net-sysfs.c | 12 +++++++-----
> > 1 file changed, 7 insertions(+), 5 deletions(-)
> >
> > diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
> > index
> > 9de33b594ff2693c054022a42703c90084122444..efec66fa78b70b2fe5b0a5920317eb1d0415d9e3
> > 100644
> > --- a/net/core/net-sysfs.c
> > +++ b/net/core/net-sysfs.c
> > @@ -757,11 +757,13 @@ static ssize_t store_rps_map(struct netdev_rx_queue
> > *queue,
> > return err;
> > }
> >
> > - hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
> > - cpumask_and(mask, mask, housekeeping_cpumask(hk_flags));
> > - if (cpumask_empty(mask)) {
> > - free_cpumask_var(mask);
> > - return -EINVAL;
> > + if (!cpumask_empty(mask)) {
> > + hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
> > + cpumask_and(mask, mask, housekeeping_cpumask(hk_flags));
> > + if (cpumask_empty(mask)) {
> > + free_cpumask_var(mask);
> > + return -EINVAL;
> > + }
> > }
Ah indeed! Sorry about that.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
next prev parent reply other threads:[~2020-08-12 8:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-12 1:34 [PATCH net] net: accept an empty mask in /sys/class/net/*/queues/rx-*/rps_cpus Eric Dumazet
2020-08-12 2:25 ` Maciej Żenczykowski
2020-08-12 3:16 ` David Ahern
2020-08-12 3:18 ` David Ahern
2020-08-12 3:19 ` Maciej Żenczykowski
2020-08-12 3:22 ` David Ahern
2020-08-12 3:27 ` Eric Dumazet
[not found] ` <CANP3RGc6Gz73Gt3v9M7KYNeNd57o--=3mF6yqdRjqOViG+TG7A@mail.gmail.com>
2020-08-12 8:00 ` peterz [this message]
2020-08-12 15:19 ` Eric Dumazet
2020-08-12 12:53 ` Nitesh Narayan Lal
2020-08-12 21:25 ` David Miller
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