]> www.infradead.org Git - users/dwmw2/linux.git/commit
net: atlantic: use irq_update_affinity_hint()
authorMohammad Heib <mheib@redhat.com>
Thu, 7 Nov 2024 12:07:39 +0000 (14:07 +0200)
committerJakub Kicinski <kuba@kernel.org>
Mon, 11 Nov 2024 23:32:26 +0000 (15:32 -0800)
commit2cd78740effc587610ca2be6d803e3f61fc87ef6
tree9a243b7213dd4583fc06227dbf4777e2745d121c
parentd9e2e290f7142d4c67c05ebbe37388d54a66c6c5
net: atlantic: use irq_update_affinity_hint()

irq_set_affinity_hint() is deprecated, Use irq_update_affinity_hint()
instead. This removes the side-effect of actually applying the affinity.

The driver does not really need to worry about spreading its IRQs across
CPUs. The core code already takes care of that. when the driver applies the
affinities by itself, it breaks the users' expectations:

1. The user configures irqbalance with IRQBALANCE_BANNED_CPULIST in
   order to prevent IRQs from being moved to certain CPUs that run a
   real-time workload.

2. atlantic device reopening will resets the affinity
   in aq_ndev_open().

3. atlantic has no idea about irqbalance's config, so it may move an IRQ to
   a banned CPU. The real-time workload suffers unacceptable latency.

Signed-off-by: Mohammad Heib <mheib@redhat.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241107120739.415743-1-mheib@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c