linux-kernel - [PATCH 3/3] net: renesas: rswitch: add modifiable ageing time

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Message-Id: <20250704-add_l2_switching-v1-3-ff882aacb258@renesas.com>
Date: Fri, 04 Jul 2025 07:51:17 +0200
From: Michael Dege <michael.dege@...esas.com>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, 
 Niklas Söderlund <niklas.soderlund@...natech.se>, 
 Paul Barker <paul@...rker.dev>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Michael Dege <michael.dege@...esas.com>, 
 Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: [PATCH 3/3] net: renesas: rswitch: add modifiable ageing time

This commit allows the setting of the MAC table aging in the R-Car S4
Rswitch using the SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME attribute.

Signed-off-by: Michael Dege <michael.dege@...esas.com>
---
 drivers/net/ethernet/renesas/rswitch.h    |  1 +
 drivers/net/ethernet/renesas/rswitch_l2.c | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h
index 45a9d02c5b5d3e7b62554bd56c6c0cb9231f684c..11ff1102668b081e395664ea73e19e0ecef74e24 100644
--- a/drivers/net/ethernet/renesas/rswitch.h
+++ b/drivers/net/ethernet/renesas/rswitch.h
@@ -849,6 +849,7 @@ enum rswitch_gwca_mode {
 #define FWMACAGC_MACDESOG	BIT(29)
 
 #define RSW_AGEING_TIME		300
+#define RSW_MAX_AGEING_TIME	65535
 
 /* TOP */
 #define TPEMIMC7(queue)		(TPEMIMC70 + (queue) * 4)
diff --git a/drivers/net/ethernet/renesas/rswitch_l2.c b/drivers/net/ethernet/renesas/rswitch_l2.c
index 242beb1f15c089585f5fe5019f626df8824b971a..c8a8a60a20e70f7ce421280ed35c0c4afe1ed039 100644
--- a/drivers/net/ethernet/renesas/rswitch_l2.c
+++ b/drivers/net/ethernet/renesas/rswitch_l2.c
@@ -196,6 +196,30 @@ static int rswitch_netdevice_event(struct notifier_block *nb,
 	return NOTIFY_OK;
 }
 
+static int rswitch_update_ageing_time(struct net_device *ndev, clock_t time)
+{
+	struct rswitch_device *rdev = netdev_priv(ndev);
+	u32 reg_val, time_val;
+
+	if (!is_rdev(ndev))
+		return -ENODEV;
+
+	/* Although brctl accepts the ageing time parameter in seconds, the value
+	 * passed to the driver is multiplied by 100. We need it in seconds.
+	 */
+	time_val = (u32)time / 100;
+
+	if (time_val > RSW_MAX_AGEING_TIME)
+		return -EINVAL;
+
+	rdev = netdev_priv(ndev);
+	reg_val = FIELD_PREP(FWMACAGC_MACAGT, time_val);
+	reg_val |= FWMACAGC_MACAGE | FWMACAGC_MACAGSL;
+	iowrite32(reg_val, rdev->priv->addr + FWMACAGC);
+
+	return 0;
+}
+
 static int rswitch_port_attr_set(struct net_device *ndev, const void *ctx,
 				 const struct switchdev_attr *attr,
 				 struct netlink_ext_ack *extack)
@@ -203,6 +227,8 @@ static int rswitch_port_attr_set(struct net_device *ndev, const void *ctx,
 	switch (attr->id) {
 	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
 		return rswitch_port_update_stp_state(ndev, attr->u.stp_state);
+	case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
+		return rswitch_update_ageing_time(ndev, attr->u.ageing_time);
 	default:
 		return -EOPNOTSUPP;
 	}

-- 
2.49.0