Samiullah Khawaja b95ed55173 xsk: Bring back busy polling support in XDP_COPY ... Commit 5ef44b3cb4 ("xsk: Bring back busy polling support") fixed the busy polling support in xsk for XDP_ZEROCOPY after it was broken in commit 86e25f40aa ("net: napi: Add napi_config"). The busy polling support with XDP_COPY remained broken since the napi_id setup in xsk_rcv_check was removed. Bring back the setup of napi_id for XDP_COPY so socket level SO_BUSYPOLL can be used to poll the underlying napi. Do the setup of napi_id for XDP_COPY in xsk_bind, as it is done currently for XDP_ZEROCOPY. The setup of napi_id for XDP_COPY in xsk_bind is safe because xsk_rcv_check checks that the rx queue at which the packet arrives is equal to the queue_id that was supplied in bind. This is done for both XDP_COPY and XDP_ZEROCOPY mode. Tested using AF_XDP support in virtio-net by running the xsk_rr AF_XDP benchmarking tool shared here: https://lore.kernel.org/all/20250320163523.3501305-1-skhawaja@google.com/T/ Enabled socket busy polling using following commands in qemu, ``` sudo ethtool -L eth0 combined 1 echo 400 | sudo tee /proc/sys/net/core/busy_read echo 100 | sudo tee /sys/class/net/eth0/napi_defer_hard_irqs echo 15000 | sudo tee /sys/class/net/eth0/gro_flush_timeout ``` Fixes: 5ef44b3cb4 ("xsk: Bring back busy polling support") Signed-off-by: Samiullah Khawaja <skhawaja@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Signed-off-by: David S. Miller <davem@davemloft.net>		2025-05-21 10:28:23 +01:00
..
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	xsk: Introduce AF_XDP buffer allocation API	2020-05-21 17:31:26 -07:00
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: Fix umem cleanup bug at socket destruct	2020-11-20 15:52:39 +01:00
xsk_buff_pool.c	xsk: Fix race condition in AF_XDP generic RX path	2025-04-24 17:11:33 -07:00
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 in XDP_COPY	2025-05-21 10:28:23 +01:00
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