netdev - [PATCH v2 net-next] bonding: pair enable_port with slave_arr

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Message-Id: <20220129055815.694469-1-maheshb@google.com>
Date:   Fri, 28 Jan 2022 21:58:15 -0800
From:   Mahesh Bandewar <maheshb@...gle.com>
To:     Netdev <netdev@...r.kernel.org>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Veaceslav Falico <vfalico@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        Mahesh Bandewar <maheshb@...gle.com>
Subject: [PATCH v2 net-next] bonding: pair enable_port with slave_arr_updates

When 803.2ad mode enables a participating port, it should update
the slave-array. I have observed that the member links are participating
and are part of the active aggregator while the traffic is egressing via
only one member link (in a case where two links are participating). Via
krpobes I discovered that that slave-arr has only one link added while
the other participating link wasn't part of the slave-arr.

I couldn't see what caused that situation but the simple code-walk
through provided me hints that the enable_port wasn't always associated
with the slave-array update.

Change-Id: I6c9ed91b027d53580734f1198579e71deee60bbf
Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
---
 drivers/net/bonding/bond_3ad.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 6006c2e8fa2b..4d876bfa0c00 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1021,8 +1021,9 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 				if (port->aggregator &&
 				    port->aggregator->is_active &&
 				    !__port_is_enabled(port)) {
-
 					__enable_port(port);
+					/* Slave array needs update */
+					*update_slave_arr = true;
 				}
 			}
 			break;
@@ -1779,6 +1780,8 @@ static void ad_agg_selection_logic(struct aggregator *agg,
 			     port = port->next_port_in_aggregator) {
 				__enable_port(port);
 			}
+			/* Slave array needs update. */
+			*update_slave_arr = true;
 		}
 	}
 
-- 
2.35.0.rc2.247.g8bbb082509-goog