Stanislav Fomichev 5ef44b3cb4 xsk: Bring back busy polling support ... Commit 86e25f40aa ("net: napi: Add napi_config") moved napi->napi_id assignment to a later point in time (napi_hash_add_with_id). This breaks __xdp_rxq_info_reg which copies napi_id at an earlier time and now stores 0 napi_id. It also makes sk_mark_napi_id_once_xdp and __sk_mark_napi_id_once useless because they now work against 0 napi_id. Since sk_busy_loop requires valid napi_id to busy-poll on, there is no way to busy-poll AF_XDP sockets anymore. Bring back the ability to busy-poll on XSK by resolving socket's napi_id at bind time. This relies on relatively recent netif_queue_set_napi, but (assume) at this point most popular drivers should have been converted. This also removes per-tx/rx cycles which used to check and/or set the napi_id value. Confirmed by running a busy-polling AF_XDP socket (github.com/fomichev/xskrtt) on mlx5 and looking at BusyPollRxPackets from /proc/net/netstat. Fixes: 86e25f40aa ("net: napi: Add napi_config") Signed-off-by: Stanislav Fomichev <sdf@fomichev.me> Acked-by: Magnus Karlsson <magnus.karlsson@intel.com> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Link: https://patch.msgid.link/20250109003436.2829560-1-sdf@fomichev.me Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2025-01-10 18:07:56 -08:00
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Kconfig
Makefile
xdp_umem.c	xsk: Require XDP_UMEM_TX_METADATA_LEN to actuate tx_metadata_len	2024-07-25 11:57:27 +02:00
xdp_umem.h
xsk_buff_pool.c	xsk: always clear DMA mapping information when unmapping the pool	2024-11-25 14:27:37 -08:00
xsk_diag.c	sock_diag: add module pointer to "struct sock_diag_handler"	2024-01-23 15:13:54 +01:00
xsk_queue.c	xdp: Fix zero-size allocation warning in xskq_create()	2023-10-09 16:13:29 +02:00
xsk_queue.h	xsk: Carry a copy of xdp_zc_max_segs within xsk_buff_pool	2024-10-14 17:23:30 +02:00
xsk.c	xsk: Bring back busy polling support	2025-01-10 18:07:56 -08:00
xsk.h	xdp: Add proper __rcu annotations to redirect map entries	2021-06-24 19:41:15 +02:00
xskmap.c	xsk: fix OOB map writes when deleting elements	2024-11-25 14:25:48 -08:00