On 7/11/23 10:00 AM, Jakub Kicinski wrote:

quoted

RDMA works with the AMD and Intel intree drivers using DMABUF without
requiring struct pages using the DRM hacky scatterlist approach.

I see, thanks. We need pages primarily for refcounting. Avoiding all
the infamous problems with memory pins. Oh well.

io_uring for example already manages the page pinning. An skb flag was
added for ZC Tx API to avoid refcounting in the core networking layer.
Any reason not to allow an alternative representation for skb frags than
struct page?