third_party/linux/patches/lacp_fix.patch

From faa5b0ac734399a5dd4458545484d22b2234c184 Mon Sep 17 00:00:00 2001
From: Lorenz Brun <lorenz@monogon.tech>
Date: Thu, 2 May 2024 10:17:14 +0200
Subject: [PATCH] bonding: 3ad: fix carrier and tx with no active ports

bond carrier state should not be be up when no ports are in
aggregation. Ports should only be enabled when they are in aggregation.

While in there, set the default template to fast mode to quickly recover
links and shorten the non-standard aggregator selection timer.
---
 drivers/net/bonding/bond_3ad.c | 39 ++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 18 deletions(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index c6807e473ab7..27dc5f2f8cf1 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -746,6 +746,22 @@ static int __agg_active_ports(struct aggregator *agg)
 	return active;
 }
 
+// __agg_enabled_ports counts the number of ports which are currently in
+// aggregation, different from __agg_active_ports which counts ports which
+// are up (but not in aggregation because of LACP).
+static int __agg_enabled_ports(struct aggregator *agg) {
+	struct port *port;
+	int en_count = 0;
+
+	for (port = agg->lag_ports; port;
+	     port = port->next_port_in_aggregator) {
+		if (__port_is_collecting_distributing(port))
+			en_count++;
+	}
+
+	return en_count;
+}
+
 /**
  * __get_agg_bandwidth - get the total bandwidth of an aggregator
  * @aggregator: the aggregator we're looking at
@@ -1186,6 +1202,8 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 			break;
 		}
 	}
+	// Update carrier state as we might have enabled/disabled ports
+	bond_3ad_set_carrier(__get_bond_by_port(port));
 }
 
 /**
@@ -1880,21 +1898,6 @@ static void ad_agg_selection_logic(struct aggregator *agg,
 		*update_slave_arr = true;
 	}
 
-	/* if the selected aggregator is of join individuals
-	 * (partner_system is NULL), enable their ports
-	 */
-	active = __get_active_agg(origin);
-
-	if (active) {
-		if (!__agg_has_partner(active)) {
-			for (port = active->lag_ports; port;
-			     port = port->next_port_in_aggregator) {
-				__enable_port(port);
-			}
-			*update_slave_arr = true;
-		}
-	}
-
 	rcu_read_unlock();
 
 	bond_3ad_set_carrier(bond);
@@ -1952,7 +1955,7 @@ static void ad_initialize_port(struct port *port, int lacp_fast)
 		.key             = 1,
 		.port_number     = 1,
 		.port_priority   = 0xff,
-		.port_state      = 1,
+		.port_state      = LACP_STATE_LACP_ACTIVITY | LACP_STATE_LACP_TIMEOUT,
 	};
 	static const struct lacpdu lacpdu = {
 		.subtype		= 0x01,
@@ -2129,7 +2132,7 @@ static void ad_marker_response_received(struct bond_marker *marker,
 /* ========= AD exported functions to the main bonding code ========= */
 
 /* Check aggregators status in team every T seconds */
-#define AD_AGGREGATOR_SELECTION_TIMER  8
+#define AD_AGGREGATOR_SELECTION_TIMER  3
 
 /**
  * bond_3ad_initiate_agg_selection - initate aggregator selection
@@ -2754,7 +2757,7 @@ int bond_3ad_set_carrier(struct bonding *bond)
 	active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
 	if (active) {
 		/* are enough slaves available to consider link up? */
-		if (__agg_active_ports(active) < bond->params.min_links) {
+		if (__agg_enabled_ports(active) < bond->params.min_links) {
 			if (netif_carrier_ok(bond->dev)) {
 				netif_carrier_off(bond->dev);
 				goto out;
-- 
2.47.2