On Mon, 10 Apr 2023 23:46:56 -0700, Christoph Hellwig <h...@infradead.org> wrote: > On Tue, Apr 11, 2023 at 02:28:00PM +0800, Xuan Zhuo wrote: > > > That is just completely broken, virtio or not. Highlevel code like > > > sockets must never do dma mappings themselves. > > > > AF_XDP provides some API for net driver. This API will do dma map or dma > > sync. > > > > cc AF_XDP maintainers. > > So in that case AF_XDP doesn't actually require a dma device as you > claimed early and gets the layering right after all. Just don't use that > API from a network driver that doesn't need to do dma mappings like > virtio for the !platform_access case then.
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