On Tue, Mar 26, 2024 at 01:19:20PM -0700, Mina Almasry wrote: > > Are you envisioning that dmabuf support would be added to the block > layer Yes. > (which I understand is part of the VFS and not driver specific), The block layer isn't really the VFS, it's just another core stack like the network stack. > or as part of the specific storage driver (like nvme for example)? If > we can add dmabuf support to the block layer itself that sounds > awesome. We may then be able to do devmem TCP on all/most storage > devices without having to modify each individual driver. I suspect we'll still need to touch the drivers to understand it, but hopefully all the main infrastructure can live in the block layer. > In your estimation, is adding dmabuf support to the block layer > something technically feasible & acceptable upstream? I notice you > suggested it so I'm guessing yes to both, but I thought I'd confirm. I think so, and I know there has been quite some interest to at least pre-register userspace memory so that the iommu overhead can be pre-loaded. It also is a much better interface for Peer to Peer transfers than what we currently have.
