Re: [PATCH net-next] xsk: introduce xsk_dma_ops

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On Tue, Apr 18, 2023 at 2:58 AM Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
> On Mon, 17 Apr 2023 11:56:10 -0700 Jakub Kicinski wrote:
> > > May misunderstand, here the "dma_ops" is not the "dma_ops" of DMA API.
> > >
> > > I mean the callbacks for xsk to do dma.
> > >
> > > Maybe, I should rename it in the next version.
> >
> > Would you mind explaining this a bit more to folks like me who are not
> > familiar with VirtIO?  DMA API is supposed to hide the DMA mapping
> > details from the stack, why is it not sufficient here.

The reason is that legacy virtio device don't use DMA(vring_use_dma_api()).

The AF_XDP assumes DMA for netdev doesn't work in this case. We need a
way to make it work.


> Umm.. also it'd help to post the user of the API in the same series.
> I only see the XSK changes, maybe if the virtio changes were in
> the same series I could answer my own question.

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