linux-kernel - [PATCH 5.4 41/71] bonding: pair enable_port with slave_arr

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Date:   Mon, 14 Feb 2022 10:26:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mahesh Bandewar <maheshb@...gle.com>,
        Jay Vosburgh <jay.vosburgh@...onical.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 41/71] bonding: pair enable_port with slave_arr_updates

From: Mahesh Bandewar <maheshb@...gle.com>

[ Upstream commit 23de0d7b6f0e3f9a6283a882594c479949da1120 ]

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
kprobes I discovered 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.

Fixes: ee6377147409 ("bonding: Simplify the xmit function for modes that use xmit_hash")
Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
Acked-by: Jay Vosburgh <jay.vosburgh@...onical.com>
Link: https://lore.kernel.org/r/20220207222901.1795287-1-maheshb@google.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/bonding/bond_3ad.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index e3b25f3109367..ed170d803247a 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1013,8 +1013,8 @@ 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);
+					*update_slave_arr = true;
 				}
 			}
 			break;
@@ -1770,6 +1770,7 @@ static void ad_agg_selection_logic(struct aggregator *agg,
 			     port = port->next_port_in_aggregator) {
 				__enable_port(port);
 			}
+			*update_slave_arr = true;
 		}
 	}
 
-- 
2.34.1