Re: [LSF/MM/BPF TOPIC] dmabuf backed read/write

Kanchan Joshi
2026-02-09T10:05:08Z

On 2/3/2026 7:59 PM, Pavel Begunkov wrote:
> Good day everyone,
>
> dma-buf is a powerful abstraction for managing buffers and DMA mappings,
> and there is growing interest in extending it to the read/write path to
> enable device-to-device transfers without bouncing data through system
> memory. I was encouraged to submit it to LSF/MM/BPF as that might be
> useful to mull over details and what capabilities and features people
> may need.

Guilty as charged, I'm interested in the topic. Thanks for posting.
We've had several attempts to move the DMA mapping cost out of the fast
path; hopefully, this will be the final one.