From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-s390-owner@vger.kernel.org>
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52182 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1725864AbgLMLgp (ORCPT
        <rfc822;linux-s390@vger.kernel.org>); Sun, 13 Dec 2020 06:36:45 -0500
Subject: Re: [patch 23/30] net/mlx5: Use effective interrupt affinity
References: <20201210192536.118432146@linutronix.de>
 <20201210194044.876342330@linutronix.de>
From: Tariq Toukan <ttoukan.linux@gmail.com>
Message-ID: <f0a01d6e-0333-e929-eabb-28cb444effe0@gmail.com>
Date: Sun, 13 Dec 2020 13:35:57 +0200
MIME-Version: 1.0
In-Reply-To: <20201210194044.876342330@linutronix.de>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
List-ID: <linux-s390.vger.kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>, LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>, Marc Zyngier <maz@kernel.org>, Saeed Mahameed <saeedm@nvidia.com>, Leon Romanovsky <leon@kernel.org>, "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>, Helge Deller <deller@gmx.de>, afzal mohammed <afzal.mohd.ma@gmail.com>, linux-parisc@vger.kernel.org, Russell King <linux@armlinux.org.uk>, linux-arm-kernel@lists.infradead.org, Mark Rutland <mark.rutland@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Christian Borntraeger <borntraeger@de.ibm.com>, Heiko Carstens <hca@linux.ibm.com>, linux-s390@vger.kernel.org, Jani Nikula <jani.nikula@linux.intel.com>, Joonas Lahtinen <joonas.lahtinen@linux.intel.com>, Rodrigo Vivi <rodrigo.vivi@intel.com>, David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>, Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>, Chris Wilson <chris@chris-wilson.co.uk>, Wambui Karuga <wambui.karugax@gmail.com>, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>, Linus Walleij <linus.walleij@linaro.org>, linux-gpio@vger.kernel.org, Lee Jones <lee.jones@linaro.org>, Jon Mason <jdmason@kudzu.us>, Dave Jiang <dave.jiang@intel.com>, Allen Hubbe <allenbh@gmail.com>, linux-ntb@googlegroups.com, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, Rob Herring <robh@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, Michal Simek <michal.simek@xilinx.com>, linux-pci@vger.kernel.org, Karthikeyan Mitran <m.karthikeyan@mobiveil.co.in>, Hou Zhiqiang <Zhiqiang.Hou@nxp.com>, Tariq Toukan <tariqt@nvidia.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Juergen Gross <jgross@suse.com>, Stefano Stabellini <sstabellini@kernel.org>, xen-devel@lists.xenproject.org



On 12/10/2020 9:25 PM, Thomas Gleixner wrote:
> Using the interrupt affinity mask for checking locality is not really
> working well on architectures which support effective affinity masks.
> 
> The affinity mask is either the system wide default or set by user space,
> but the architecture can or even must reduce the mask to the effective set,
> which means that checking the affinity mask itself does not really tell
> about the actual target CPUs.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Saeed Mahameed <saeedm@nvidia.com>
> Cc: Leon Romanovsky <leon@kernel.org>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: netdev@vger.kernel.org
> Cc: linux-rdma@vger.kernel.org
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/en_main.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -1998,7 +1998,7 @@ static int mlx5e_open_channel(struct mlx
>   	c->num_tc   = params->num_tc;
>   	c->xdp      = !!params->xdp_prog;
>   	c->stats    = &priv->channel_stats[ix].ch;
> -	c->aff_mask = irq_get_affinity_mask(irq);
> +	c->aff_mask = irq_get_effective_affinity_mask(irq);
>   	c->lag_port = mlx5e_enumerate_lag_port(priv->mdev, ix);
>   
>   	netif_napi_add(netdev, &c->napi, mlx5e_napi_poll, 64);
> 

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

Thanks.