net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags

Add an interface for the user to notify the kernel that it is done
reading the devmem dmabuf frags returned as cmsg. The kernel will
drop the reference on the frags to make them available for reuse.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Kaiyuan Zhang <kaiyuanz@google.com>
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240910171458.219195-11-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

This commit is contained in:

Mina Almasry

2024-09-10 17:14:54 +00:00

committed by

Jakub Kicinski

parent 8f0b3cc9a4

commit 678f6e28b5

7 changed files with 78 additions and 0 deletions

									
										include/uapi/asm-generic/socket.h
									
		+1
		
												View File
												
				@@ -139,6 +139,7 @@

				#define SCM_DEVMEM_LINEAR	SO_DEVMEM_LINEAR

				#define SO_DEVMEM_DMABUF	79

				#define SCM_DEVMEM_DMABUF	SO_DEVMEM_DMABUF

				#define SO_DEVMEM_DONTNEED	80

				#if !defined(__KERNEL__)