xsk: add multi-buffer support for sockets sharing umem

Userspace applications indicate their multi-buffer capability to xsk
using XSK_USE_SG socket bind flag. For sockets using shared umem the
bind flag may contain XSK_USE_SG only for the first socket. For any
subsequent socket the only option supported is XDP_SHARED_UMEM.

Add option XDP_UMEM_SG_FLAG in umem config flags to store the
multi-buffer handling capability when indicated by XSK_USE_SG option in
bing flag by the first socket. Use this to derive multi-buffer capability
for subsequent sockets in xsk core.

Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
Fixes: 81470b5c3c ("xsk: introduce XSK_USE_SG bind flag for xsk socket")
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230907035032.2627879-1-tirthendu.sarkar@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

This commit is contained in:

Tirthendu Sarkar

2023-09-07 09:20:32 +05:30

committed by

Alexei Starovoitov

parent 5c04433daf

commit d609f3d228

3 changed files with 6 additions and 1 deletions

									
										include/net/xdp_sock.h
									
		+2
		
												View File
												
				@@ -14,6 +14,8 @@

				#include <linux/mm.h>

				#include <net/sock.h>

				#define XDP_UMEM_SG_FLAG (1 << 1)

				struct net_device;

				struct xsk_queue;

				struct xdp_buff;