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Subject: Re: [patch 21/30] net/mlx4: Use effective interrupt affinity
References: <20201210192536.118432146@linutronix.de>
 <20201210194044.672935978@linutronix.de>
From: Tariq Toukan <ttoukan.linux@gmail.com>
Message-ID: <57c3f9d3-7262-9916-626b-c2234de763f0@gmail.com>
Date: Sun, 13 Dec 2020 13:31:24 +0200
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To: Thomas Gleixner <tglx@linutronix.de>, LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>, Marc Zyngier <maz@kernel.org>, Tariq Toukan <tariqt@nvidia.com>, "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>, Saeed Mahameed <saeedm@nvidia.com>, Leon Romanovsky <leon@kernel.org>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Juergen Gross <jgross@suse.com>, Stefano Stabellini <sstabellini@kernel.org>, xen-devel@lists.xenproject.org
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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: Tariq Toukan <tariqt@nvidia.com>
> 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/mlx4/en_cq.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/net/ethernet/mellanox/mlx4/en_cq.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_cq.c
> @@ -117,7 +117,7 @@ int mlx4_en_activate_cq(struct mlx4_en_p
>   			assigned_eq = true;
>   		}
>   		irq = mlx4_eq_get_irq(mdev->dev, cq->vector);
> -		cq->aff_mask = irq_get_affinity_mask(irq);
> +		cq->aff_mask = irq_get_effective_affinity_mask(irq);
>   	} else {
>   		/* For TX we use the same irq per
>   		ring we assigned for the RX    */
> 

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

Thanks.