Re: [RFC net-next 0/6] Cleanup IRQ affinity checks in several drivers

[Joe Damato]

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).