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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
arch
block
certs
crypto
Documentation Including fixes from netfilter, Bluetooth and WPAN. 2025-01-09 12:40:58 -08:00
drivers eth: bnxt: always recalculate features after XDP clearing, fix null-deref 2025-01-10 18:01:29 -08:00
fs for-6.13-rc6-tag 2025-01-09 10:16:45 -08:00
include xsk: Bring back busy polling support 2025-01-10 18:07:56 -08:00
init
io_uring for-6.13-rc6-tag 2025-01-09 10:16:45 -08:00
ipc
kernel
lib
LICENSES
mm
net xsk: Bring back busy polling support 2025-01-10 18:07:56 -08:00
rust
samples
scripts
security selinux/stable-6.13 PR 20250107 2025-01-07 14:49:48 -08:00
sound
tools Including fixes from netfilter, Bluetooth and WPAN. 2025-01-09 12:40:58 -08:00
usr
virt
.clang-format
.clippy.toml
.cocciconfig
.editorconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
.rustfmt.toml
COPYING
CREDITS MAINTAINERS: remove Andy Gospodarek from bonding 2025-01-09 08:30:01 -08:00
Kbuild
Kconfig
MAINTAINERS Including fixes from netfilter, Bluetooth and WPAN. 2025-01-09 12:40:58 -08:00
Makefile
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.