linux-kernel - Re: [PATCH v2 4/8] net: mlx5: switch comp_irqs_request() to using for_each_numa

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Date:   Thu, 20 Apr 2023 11:27:26 +0300
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Yury Norov <yury.norov@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Pawel Chmielewski <pawel.chmielewski@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Gal Pressman <gal@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Barry Song <baohua@...nel.org>
Subject: Re: [PATCH v2 4/8] net: mlx5: switch comp_irqs_request() to using
 for_each_numa_cpu



On 20/04/2023 8:19, Yury Norov wrote:
> for_each_numa_cpu() is a more straightforward alternative to
> for_each_numa_hop_mask() + for_each_cpu_andnot().
> 
> Signed-off-by: Yury Norov <yury.norov@...il.com>
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/eq.c | 16 +++++-----------
>   1 file changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
> index 38b32e98f3bd..80368952e9b1 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
> @@ -817,12 +817,10 @@ static void comp_irqs_release(struct mlx5_core_dev *dev)
>   static int comp_irqs_request(struct mlx5_core_dev *dev)
>   {
>   	struct mlx5_eq_table *table = dev->priv.eq_table;
> -	const struct cpumask *prev = cpu_none_mask;
> -	const struct cpumask *mask;
>   	int ncomp_eqs = table->num_comp_eqs;
>   	u16 *cpus;
>   	int ret;
> -	int cpu;
> +	int cpu, hop;
>   	int i;
>   
>   	ncomp_eqs = table->num_comp_eqs;
> @@ -844,15 +842,11 @@ static int comp_irqs_request(struct mlx5_core_dev *dev)
>   
>   	i = 0;
>   	rcu_read_lock();
> -	for_each_numa_hop_mask(mask, dev->priv.numa_node) {
> -		for_each_cpu_andnot(cpu, mask, prev) {
> -			cpus[i] = cpu;
> -			if (++i == ncomp_eqs)
> -				goto spread_done;
> -		}
> -		prev = mask;
> +	for_each_numa_cpu(cpu, hop, dev->priv.numa_node, cpu_possible_mask) {

I like this clean API.

nit:
Previously cpu_online_mask was used here. Is this change intentional?
We can fix it in a followup patch if this is the only comment on the series.

Reviewed-by: Tariq Toukan <tariqt@...dia.com>

> +		cpus[i] = cpu;
> +		if (++i == ncomp_eqs)
> +			break;
>   	}
> -spread_done:
>   	rcu_read_unlock();
>   	ret = mlx5_irqs_request_vectors(dev, cpus, ncomp_eqs, table->comp_irqs);
>   	kfree(cpus);