linux-kernel - RE: [Intel-wired-lan] [PATCH net-next v5 3/9] dpll: Add notifier chain for dpll events

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Message-ID: <IA3PR11MB898637A313684AB8D381363CE599A@IA3PR11MB8986.namprd11.prod.outlook.com>
Date: Thu, 5 Feb 2026 10:17:23 +0000
From: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>
To: "Vecera, Ivan" <ivecera@...hat.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
CC: Eric Dumazet <edumazet@...gle.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, Leon Romanovsky <leon@...nel.org>, "Lobakin,
 Aleksander" <aleksander.lobakin@...el.com>, "linux-rdma@...r.kernel.org"
	<linux-rdma@...r.kernel.org>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, "Kubalewski, Arkadiusz"
	<arkadiusz.kubalewski@...el.com>, "intel-wired-lan@...ts.osuosl.org"
	<intel-wired-lan@...ts.osuosl.org>, Jakub Kicinski <kuba@...nel.org>, "Paolo
 Abeni" <pabeni@...hat.com>, Jiri Pirko <jiri@...nulli.us>, Richard Cochran
	<richardcochran@...il.com>, Prathosh Satish <Prathosh.Satish@...rochip.com>,
	Vadim Fedorenko <vadim.fedorenko@...ux.dev>, Mark Bloch <mbloch@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Tariq Toukan
	<tariqt@...dia.com>, Andrew Lunn <andrew+netdev@...n.ch>, Jonathan Lemon
	<jonathan.lemon@...il.com>, Saeed Mahameed <saeedm@...dia.com>, "David S.
 Miller" <davem@...emloft.net>
Subject: RE: [Intel-wired-lan] [PATCH net-next v5 3/9] dpll: Add notifier
 chain for dpll events



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf
> Of Ivan Vecera
> Sent: Tuesday, February 3, 2026 6:40 PM
> To: netdev@...r.kernel.org
> Cc: Eric Dumazet <edumazet@...gle.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; Leon Romanovsky <leon@...nel.org>;
> Lobakin, Aleksander <aleksander.lobakin@...el.com>; linux-
> rdma@...r.kernel.org; Kitszel, Przemyslaw
> <przemyslaw.kitszel@...el.com>; Kubalewski, Arkadiusz
> <arkadiusz.kubalewski@...el.com>; intel-wired-lan@...ts.osuosl.org;
> Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>;
> Jiri Pirko <jiri@...nulli.us>; Richard Cochran
> <richardcochran@...il.com>; Prathosh Satish
> <Prathosh.Satish@...rochip.com>; Vadim Fedorenko
> <vadim.fedorenko@...ux.dev>; Mark Bloch <mbloch@...dia.com>; linux-
> kernel@...r.kernel.org; Tariq Toukan <tariqt@...dia.com>; Andrew Lunn
> <andrew+netdev@...n.ch>; Jonathan Lemon <jonathan.lemon@...il.com>;
> Saeed Mahameed <saeedm@...dia.com>; David S. Miller
> <davem@...emloft.net>
> Subject: [Intel-wired-lan] [PATCH net-next v5 3/9] dpll: Add notifier
> chain for dpll events
> 
> From: Petr Oros <poros@...hat.com>
> 
> Currently, the DPLL subsystem reports events (creation, deletion,
> changes) to userspace via Netlink. However, there is no mechanism for
> other kernel components to be notified of these events directly.
> 
> Add a raw notifier chain to the DPLL core protected by dpll_lock. This
> allows other kernel subsystems or drivers to register callbacks and
> receive notifications when DPLL devices or pins are created, deleted,
> or modified.
> 
> Define the following:
> - Registration helpers: {,un}register_dpll_notifier()
> - Event types: DPLL_DEVICE_CREATED, DPLL_PIN_CREATED, etc.
> - Context structures: dpll_{device,pin}_notifier_info  to pass
> relevant
>   data to the listeners.
> 
> The notification chain is invoked alongside the existing Netlink event
> generation to ensure in-kernel listeners are kept in sync with the
> subsystem state.
> 
> Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
> Co-developed-by: Ivan Vecera <ivecera@...hat.com>
> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
> Signed-off-by: Petr Oros <poros@...hat.com>
> ---
>  drivers/dpll/dpll_core.c    | 57
> +++++++++++++++++++++++++++++++++++++
>  drivers/dpll/dpll_core.h    |  4 +++
>  drivers/dpll/dpll_netlink.c |  6 ++++
>  include/linux/dpll.h        | 29 +++++++++++++++++++
>  4 files changed, 96 insertions(+)
> 
> diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index
> f04ed7195cadd..b05fe2ba46d91 100644
> --- a/drivers/dpll/dpll_core.c
> +++ b/drivers/dpll/dpll_core.c
> @@ -23,6 +23,8 @@ DEFINE_MUTEX(dpll_lock);
> DEFINE_XARRAY_FLAGS(dpll_device_xa, XA_FLAGS_ALLOC);
> DEFINE_XARRAY_FLAGS(dpll_pin_xa, XA_FLAGS_ALLOC);
> 
> +static RAW_NOTIFIER_HEAD(dpll_notifier_chain);
> +

...

> --
> 2.52.0

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>