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

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Date:   Wed, 26 Jan 2022 16:26:05 -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 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.

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

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 6006c2e8fa2b..f20bbc18a03f 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1024,6 +1024,8 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)

 					__enable_port(port);
 				}
+				/* Slave array needs update */
+				*update_slave_arr = true;
 			}
 			break;
 		default:
@@ -1779,6 +1781,8 @@ 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.rc0.227.g00780c9af4-goog