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Message-ID: <20250325213056.332902-7-sdf@fomichev.me> Date: Tue, 25 Mar 2025 14:30:53 -0700 From: Stanislav Fomichev <sdf@...ichev.me> To: netdev@...r.kernel.org Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com Subject: [PATCH net-next 6/9] docs: net: document netdev notifier expectations We don't have a consistent state yet, but document where we think we are and where we wanna be. Signed-off-by: Stanislav Fomichev <sdf@...ichev.me> --- Documentation/networking/netdevices.rst | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Documentation/networking/netdevices.rst b/Documentation/networking/netdevices.rst index ebb868f50ac2..89337cfec36e 100644 --- a/Documentation/networking/netdevices.rst +++ b/Documentation/networking/netdevices.rst @@ -343,6 +343,24 @@ there are two sets of interfaces: ``dev_xxx`` and ``netif_xxx`` (e.g., acquiring the instance lock themselves, while the ``netif_xxx`` functions assume that the driver has already acquired the instance lock. +Notifiers and netdev instance lock +================================== + +For device drivers that implement shaping or queue management APIs, +some of the notifiers (``enum netdev_cmd``) are running under the netdev +instance lock. + +Currently only the following notifiers are running under the instance lock: +* ``NETDEV_REGISTER`` +* ``NETDEV_UP`` +* ``NETDEV_UNREGISTER`` + +There are no clear expectations for the remaining notifiers. Notifiers not on +the list may run with or without the instance lock, potentially even invoking +the same notifier type with and without the lock from different code paths. +The goal is to eventually ensure that all (or most, with a few documented +exceptions) notifiers run under the instance lock. + NETDEV_INTERNAL symbol namespace ================================ -- 2.48.1
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