[PATCH net-next v2 0/2] net: sysfs: use ops lock for speed and duplex

[Wang Zhan <wang.zhan@smartx.com>]

Reading speed and duplex from sysfs currently holds RTNL across the
get_link_ksettings callback. This unnecessarily serializes monitoring
reads with unrelated rtnetlink operations.

On CPU-throttled hosts, a periodic reader such as node-exporter can hold
RTNL for hundreds of milliseconds while an mlx5 callback runs, delaying
unrelated rtnetlink operations.

Factor the shared link settings read first, then change only the helper's
locking. Legacy devices and callbacks which request
ETHTOOL_OP_NEEDS_RTNL_LINKSETTINGS retain the existing RTNL path.

Changes in v2:
- Split the common-code refactoring from the locking change.
- Keep speed_show() and duplex_show() focused on formatting the result.

v1: https://lore.kernel.org/netdev/20260831080623.1064001-1-wang.zhan@smartx.com/

Checks:
- checkpatch.pl --strict
- git diff --check
- x86_64 defconfig W=1 net/core/net-sysfs.o

Wang Zhan (2):
  net: sysfs: factor out link settings read
  net: sysfs: use ops lock for speed and duplex

 net/core/net-sysfs.c | 112 ++++++++++++++++++++++++-------------------
 1 file changed, 63 insertions(+), 49 deletions(-)


base-commit: b35d3d2fae3058265ba937544a3895cedce18d08
-- 
2.47.3