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Date:   Wed, 12 Aug 2020 08:53:49 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Maciej ┼╗enczykowski <maze@...gle.com>,
        Alex Belits <abelits@...vell.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH net] net: accept an empty mask in
 /sys/class/net/*/queues/rx-*/rps_cpus


On 8/11/20 9:34 PM, Eric Dumazet 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@...gle.com>
> Reported-by: Maciej ┼╗enczykowski <maze@...gle.com>
> Cc: Alex Belits <abelits@...vell.com>
> Cc: Nitesh Narayan Lal <nitesh@...hat.com>
> Cc: Peter Zijlstra (Intel) <peterz@...radead.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;
> +		}
>  	}
>  
>  	map = kzalloc(max_t(unsigned int,

Ah! my bad.
Thanks for the fix.

Acked-by: Nitesh Narayan Lal <nitesh@...hat.com>



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