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

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Message-Id: <20250510044504.52618-4-tonghao@bamaicloud.com>
Date: Sat, 10 May 2025 12:45:03 +0800
From: tonghao@...aicloud.com
To: netdev@...r.kernel.org
Cc: Tonghao Zhang <tonghao@...aicloud.com>,
	Jay Vosburgh <jv@...sburgh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Andrew Lunn <andrew+netdev@...n.ch>
Subject: [PATCH net-next 3/4] net: bonding: send peer notify when failure recovery

From: Tonghao Zhang <tonghao@...aicloud.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@...sburgh.net>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>
Cc: Jonathan Corbet <corbet@....net>
Cc: Andrew Lunn <andrew+netdev@...n.ch>
Signed-off-by: Tonghao Zhang <tonghao@...aicloud.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;
-- 
2.34.1