Re: [PATCH net-next 3/4] net: bonding: send peer notify when failure recovery

[Hangbin Liu <liuhangbin@gmail.com>]

Hi Tonghao,
On Sat, May 10, 2025 at 12:45:03PM +0800, tonghao@bamaicloud.com wrote:
> From: Tonghao Zhang <tonghao@bamaicloud.com>
> 
> While hardware failures in NICs, optical transceivers, or switches
> are unavoidable, rapid system recovery can be achieved post-restoration.
> For example, triggering immediate ARP/ND packet transmission upon
> LACP failure recovery enables the system to swiftly resume normal
> operations, thereby minimizing service downtime.
> 
> Cc: Jay Vosburgh <jv@jvosburgh.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: Simon Horman <horms@kernel.org>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Andrew Lunn <andrew+netdev@lunn.ch>
> Signed-off-by: Tonghao Zhang <tonghao@bamaicloud.com>
> ---
>  drivers/net/bonding/bond_3ad.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
> index c6807e473ab7..6577ce54d115 100644
> --- a/drivers/net/bonding/bond_3ad.c
> +++ b/drivers/net/bonding/bond_3ad.c
> @@ -982,6 +982,19 @@ static int ad_marker_send(struct port *port, struct bond_marker *marker)
>  	return 0;
>  }
>  
> +static void ad_peer_notif_send(struct port *port)
> +{
> +	if (!port->aggregator->is_active)
> +		return;
> +
> +	struct bonding *bond = port->slave->bond;
> +	if (bond->params.broadcast_neighbor && rtnl_trylock()) {
> +		bond->send_peer_notif = bond->params.num_peer_notif *
> +			max(1, bond->params.peer_notif_delay);
> +		rtnl_unlock();
> +	}
> +}
> +
>  /**
>   * ad_mux_machine - handle a port's mux state machine
>   * @port: the port we're looking at
> @@ -1164,6 +1177,7 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
>  			port->actor_oper_port_state |= LACP_STATE_COLLECTING;
>  			port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
>  			port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
> +			ad_peer_notif_send(port);
>  			ad_enable_collecting_distributing(port,
>  							  update_slave_arr);
>  			port->ntt = true;

Maybe enable notify after collecting/distributing?

And also please rebase to latest net-next. There is another switch case
AD_MUX_DISTRIBUTING that enables collecting/distributing, which should
also send notify.

Thanks
Hangbin