RE: [Intel-wired-lan] [PATCH net-next v2 03/13] net: introduce ndo_set_rx_mode_async and dev_rx_mode_work

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@xxxxxxxxxx> On Behalf
> Of Stanislav Fomichev
> Sent: Wednesday, March 18, 2026 4:03 PM
> To: netdev@xxxxxxxxxxxxxxx
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> Subject: [Intel-wired-lan] [PATCH net-next v2 03/13] net: introduce
> ndo_set_rx_mode_async and dev_rx_mode_work
> 
> Add ndo_set_rx_mode_async callback that drivers can implement instead
> of the legacy ndo_set_rx_mode. The legacy callback runs under the
> netif_addr_lock spinlock with BHs disabled, preventing drivers from
> sleeping. The async variant runs from a work queue with rtnl_lock and
> netdev_lock_ops held, in fully sleepable context.
> 
> When __dev_set_rx_mode() sees ndo_set_rx_mode_async, it schedules
> dev_rx_mode_work instead of calling the driver inline. The work
> function takes two snapshots of each address list (uc/mc) under the
> addr_lock, then drops the lock and calls the driver with the work
> copies. After the driver returns, it reconciles the snapshots back to
> the real lists under the lock.
> 
> Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxxx>
> ---
>  Documentation/networking/netdevices.rst |  8 +++
>  include/linux/netdevice.h               | 20 ++++++
>  net/core/dev.c                          | 94 +++++++++++++++++++++++-
> -
>  3 files changed, 115 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/networking/netdevices.rst
> b/Documentation/networking/netdevices.rst
> index 35704d115312..dc83d78d3b27 100644
> --- a/Documentation/networking/netdevices.rst
> +++ b/Documentation/networking/netdevices.rst
> @@ -289,6 +289,14 @@ struct net_device synchronization rules
>  ndo_set_rx_mode:
>  	Synchronization: netif_addr_lock spinlock.
>  	Context: BHs disabled

...

>  	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
>  	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
> 
> --
> 2.53.0

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