netdev - Re: mlx5 broken affinity

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Date:   Thu, 2 Nov 2017 18:14:56 +0200
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Jes Sorensen <jsorensen@...com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Saeed Mahameed <saeedm@....mellanox.co.il>
Cc:     Networking <netdev@...r.kernel.org>,
        Leon Romanovsky <leonro@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Kernel Team <kernel-team@...com>,
        Christoph Hellwig <hch@....de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: mlx5 broken affinity


> This wasn't to start a debate about which allocation method is the
> perfect solution. I am perfectly happy with the new default, the part
> that is broken is to take away the user's option to reassign the
> affinity. That is a bug and it needs to be fixed!

Well,

I would really want to wait for Thomas/Christoph to reply, but this
simple change fixed it for me:
--
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 573dc52b0806..eccd06be5e44 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -146,8 +146,7 @@ bool irq_can_set_affinity_usr(unsigned int irq)
  {
         struct irq_desc *desc = irq_to_desc(irq);

-       return __irq_can_set_affinity(desc) &&
-               !irqd_affinity_is_managed(&desc->irq_data);
+       return __irq_can_set_affinity(desc);
  }

  /**
--