On 6/29/23 8:27 PM, Mina Almasry wrote:

Hello Jakub, I'm looking into device memory (peer-to-peer) networking
actually, and I plan to pursue using the page pool as a front end.

Quick description of what I have so far:
current implementation uses device memory with struct pages; I am
putting all those pages in a gen_pool, and we have written an
allocator that allocates pages from the gen_pool. In the driver, we
use this allocator instead of alloc_page() (the driver in question is
gve which currently doesn't use the page pool). When the driver is
done with the p2p page, it simply decrements the refcount on it and
the page is freed back to the gen_pool.

I take it these are typical Linux networking applications using standard
socket APIs (not dpdk or xdp sockets or such)? If so, what does tcpdump
show for those skbs with pages for the device memory?



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