igb: XDP/ZC busy polling

igb: XDP/ZC busy polling

[Kurt Kanzenbach]

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Hello Joe,

I noticed that XDP/ZC busy polling does not work anymore in combination
with igb driver. This seems to be related to commit 5ef44b3cb43b ("xsk:
Bring back busy polling support") which relies on
netif_queue_set_napi().

I see you implemented it for e1000, igc and so on. However, igb is
missing. Do you have any plans to add the missing registration to igb?
Just asking. Otherwise, I can send a patch for it.

Thanks,
Kurt

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Re: igb: XDP/ZC busy polling

[Joe Damato]

On Fri, Feb 07, 2025 at 09:38:41AM +0100, Kurt Kanzenbach wrote:
> Hello Joe,
> 
> I noticed that XDP/ZC busy polling does not work anymore in combination
> with igb driver. This seems to be related to commit 5ef44b3cb43b ("xsk:
> Bring back busy polling support") which relies on
> netif_queue_set_napi().
> 
> I see you implemented it for e1000, igc and so on. However, igb is
> missing. Do you have any plans to add the missing registration to igb?
> Just asking. Otherwise, I can send a patch for it.

Please feel free; I don't have an igb device so I wouldn't be able
to test it, but I'd happily review it so please CC me.

BTW, I wrote a small series that updates the documentation and adds
a test for AF_XDP [1] that you may want to consider applying/running
(if it is not merged by the time you add support to igb).

[1]: https://lore.kernel.org/lkml/20250207030916.32751-1-jdamato@fastly.com/