netdev - Re: [PATCH v3 03/14] i40e: Use irq_update_affinity

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Message-ID: <4eca6f2d-c5d2-1f1d-ffc4-4d8f7bbed68e@intel.com>
Date:   Tue, 13 Jul 2021 14:52:10 -0700
From:   Jesse Brandeburg <jesse.brandeburg@...el.com>
To:     Nitesh Narayan Lal <nitesh@...hat.com>,
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Subject: Re: [PATCH v3 03/14] i40e: Use irq_update_affinity_hint

On 7/13/2021 2:14 PM, Nitesh Narayan Lal wrote:
> The driver uses irq_set_affinity_hint() for two purposes:
>
> - To set the affinity_hint which is consumed by the userspace for
>    distributing the interrupts
>
> - To apply an affinity that it provides for the i40e interrupts
>
> The latter is done to ensure that all the interrupts are evenly spread
> across all available CPUs. However, since commit a0c9259dc4e1 ("irq/matrix:
> Spread interrupts on allocation") the spreading of interrupts is
> dynamically performed at the time of allocation. Hence, there is no need
> for the drivers to enforce their own affinity for the spreading of
> interrupts.
>
> Also, irq_set_affinity_hint() applying the provided cpumask as an affinity
> for the interrupt is an undocumented side effect. To remove this side
> effect irq_set_affinity_hint() has been marked as deprecated and new
> interfaces have been introduced. Hence, replace the irq_set_affinity_hint()
> with the new interface irq_update_affinity_hint() that only sets the
> pointer for the affinity_hint.
>
> Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>
Thanks!

Acked-by: Jesse Brandeburg <jesse.brandeburg@...el.com>