On 15/08/2024 13:22, Joe Damato wrote:
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On Wed, Aug 14, 2024 at 05:20:46PM -0700, Jakub Kicinski wrote:
On Wed, 14 Aug 2024 19:01:40 +0100 Joe Damato wrote:
If it is, then the only option is to have the drivers pass in their
IRQ affinity masks, as Stanislav suggested, to avoid adding that
call to the hot path.
If not, then the IRQ from napi_struct can be used and the affinity
mask can be generated on every napi poll. i40e/gve/iavf would need
calls to netif_napi_set_irq to set the IRQ mapping, which seems to
be straightforward.
It's a bit sad to have the generic solution blocked.
cpu_rmap_update() is exported. Maybe we can call it from our notifier?
rmap lives in struct net_device
I agree on the sadness. I will take a look today.
I guess if we were being really ambitious, we'd try to move ARFS
stuff into the core (as RSS was moved into the core).
Sorry for the late reply. Maybe we can modify affinity notifier infra to
support more than a single notifier per IRQ.
@Thomas, do you know why only a single notifier per IRQ is supported?
