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Paolo Abeni
e0722efbcf
Ido Schimmel says: ==================== mlxsw: Make the driver ops-locked Make the driver ops-locked in order to allow ethtool operations to be invoked without RTNL being held. An ops-locked driver has most of its NDOs, all of its ethtool operations and some net device notifications run with the netdev instance lock held. In the specific case of mlxsw, the driver is not using any functions that acquire this lock nor functions that expect the lock to be held for an ops-locked driver. Therefore, converting its NDOs to run with the lock being held is trivial except for a small quirk which is handled in patch #1. The driver does not generate any net device notifications, so there is no risk of nested notifications of the ops-locked types. For the notifications that run under the instance lock, RTNL is also held, and the driver does not acquire the instance lock itself, so no changes are required in its notifier handling. Ethtool operations can be invoked without RTNL except for two operations that are annotated in patch #2. Lastly, patch #3 converts the driver to be ops-locked. A probe on rtnl_lock() shows it is no longer taken when dumping statistics: # perf probe --add rtnl_lock Before: # perf stat -e probe:rtnl_lock -- ethtool -S swp1 --all-groups [...] 1 probe:rtnl_lock After: # perf stat -e probe:rtnl_lock -- ethtool -S swp1 --all-groups [...] 0 probe:rtnl_lock No issues were reported after running a full regression with a debug config that has lockdep enabled. ==================== Link: https://patch.msgid.link/20260708123933.1303291-1-idosch@nvidia.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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