linux-kernel - [PATCH net-next 8/8] net: lan966x: Update PGID when lag ports are changing link status

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Date:   Sun, 26 Jun 2022 15:04:51 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     <UNGLinuxDriver@...rochip.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux@...linux.org.uk>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net-next 8/8] net: lan966x: Update PGID when lag ports are changing link status

When a port under a bond device is changing it's link status it is
required to recalculate the PGID entries. Otherwise the HW will still
try to transmit frames on the port that is down.

Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 .../net/ethernet/microchip/lan966x/lan966x_lag.c | 16 ++++++++++++++++
 .../ethernet/microchip/lan966x/lan966x_main.h    |  3 +++
 .../ethernet/microchip/lan966x/lan966x_port.c    |  6 ++++++
 3 files changed, 25 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
index 4ce41a55737c..eec5d6912757 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
@@ -151,6 +151,22 @@ void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond)
 	lan966x_lag_set_aggr_pgids(lan966x);
 }
 
+void lan966x_lag_port_down(struct lan966x_port *port)
+{
+	port->bond_fix = port->bond;
+	lan966x_lag_port_leave(port, port->bond);
+}
+
+void lan966x_lag_port_up(struct lan966x_port *port)
+{
+	struct lan966x *lan966x = port->lan966x;
+
+	port->bond = port->bond_fix;
+	lan966x_lag_set_port_ids(lan966x);
+	lan966x_update_fwd_mask(lan966x);
+	lan966x_lag_set_aggr_pgids(lan966x);
+}
+
 int lan966x_lag_port_prechangeupper(struct net_device *dev,
 				    struct netdev_notifier_changeupper_info *info)
 {
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index c1f5ca5d91a4..23264e70fb8a 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -293,6 +293,7 @@ struct lan966x_port {
 	struct sk_buff_head tx_skbs;
 
 	struct net_device *bond;
+	struct net_device *bond_fix;
 	bool lag_tx_active;
 };
 
@@ -420,6 +421,8 @@ int lan966x_lag_port_join(struct lan966x_port *port,
 			  struct net_device *bond,
 			  struct netlink_ext_ack *extack);
 void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond);
+void lan966x_lag_port_down(struct lan966x_port *port);
+void lan966x_lag_port_up(struct lan966x_port *port);
 int lan966x_lag_port_prechangeupper(struct net_device *dev,
 				    struct netdev_notifier_changeupper_info *info);
 int lan966x_lag_port_changelowerstate(struct net_device *dev,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_port.c b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
index f141644e4372..e99478a443cb 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_port.c
@@ -274,11 +274,17 @@ static void lan966x_port_link_up(struct lan966x_port *port)
 void lan966x_port_config_down(struct lan966x_port *port)
 {
 	lan966x_port_link_down(port);
+
+	if (port->bond)
+		lan966x_lag_port_down(port);
 }
 
 void lan966x_port_config_up(struct lan966x_port *port)
 {
 	lan966x_port_link_up(port);
+
+	if (port->bond_fix)
+		lan966x_lag_port_up(port);
 }
 
 void lan966x_port_status_get(struct lan966x_port *port,
-- 
2.33.0