On Tue, Jul 25, 2023 at 10:13:48AM +0800, Xuan Zhuo wrote:

On Mon, 24 Jul 2023 09:43:42 -0700, Christoph Hellwig [off-list ref] wrote:

quoted

On Thu, Jul 20, 2023 at 01:21:07PM -0400, Michael S. Tsirkin wrote:

quoted

Well I think we can add wrappers like virtio_dma_sync and so on.
There are NOP for non-dma so passing the dma device is harmless.

Yes, please.

I am not sure I got this fully.

Are you mean this:
https://lore.kernel.org/all/20230214072704.126660-8-xuanzhuo@linux.alibaba.com/ (local)
https://lore.kernel.org/all/20230214072704.126660-9-xuanzhuo@linux.alibaba.com/ (local)

Then the driver must do dma operation(map and sync) by these virtio_dma_* APIs.
No care the device is non-dma device or dma device.

yes

Then the AF_XDP must use these virtio_dma_* APIs for virtio device.

We'll worry about AF_XDP when the patch is posted.

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MST