linux-kernel - [PATCH net-next 6/8] net: dsa: microchip: add support for port mirror operations

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Date:   Thu, 28 Jan 2021 12:11:10 +0530
From:   Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
To:     <andrew@...n.ch>, <olteanv@...il.com>, <netdev@...r.kernel.org>,
        <robh+dt@...nel.org>
CC:     <kuba@...nel.org>, <vivien.didelot@...il.com>,
        <f.fainelli@...il.com>, <davem@...emloft.net>,
        <UNGLinuxDriver@...rochip.com>, <Woojung.Huh@...rochip.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH net-next 6/8] net: dsa: microchip: add support for port mirror operations

Added support for port_mirror_add() and port_mirror_del operations

Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
---
 drivers/net/dsa/microchip/lan937x_main.c | 42 ++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 5693c59df497..aa2efa4e5823 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -162,6 +162,46 @@ static void lan937x_port_stp_state_set(struct dsa_switch *ds, int port,
 	mutex_unlock(&dev->dev_mutex);
 }
 
+static int lan937x_port_mirror_add(struct dsa_switch *ds, int port,
+				   struct dsa_mall_mirror_tc_entry *mirror,
+				   bool ingress)
+{
+	struct ksz_device *dev = ds->priv;
+
+	if (ingress)
+		lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_RX, true);
+	else
+		lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_TX, true);
+
+	lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_SNIFFER, false);
+
+	/* configure mirror port */
+	lan937x_port_cfg(dev, mirror->to_local_port, P_MIRROR_CTRL,
+			 PORT_MIRROR_SNIFFER, true);
+
+	lan937x_cfg(dev, S_MIRROR_CTRL, SW_MIRROR_RX_TX, false);
+
+	return 0;
+}
+
+static void lan937x_port_mirror_del(struct dsa_switch *ds, int port,
+				    struct dsa_mall_mirror_tc_entry *mirror)
+{
+	struct ksz_device *dev = ds->priv;
+	u8 data;
+
+	if (mirror->ingress)
+		lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_RX, false);
+	else
+		lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_TX, false);
+
+	lan937x_pread8(dev, port, P_MIRROR_CTRL, &data);
+
+	if (!(data & (PORT_MIRROR_RX | PORT_MIRROR_TX)))
+		lan937x_port_cfg(dev, mirror->to_local_port, P_MIRROR_CTRL,
+				 PORT_MIRROR_SNIFFER, false);
+}
+
 static phy_interface_t lan937x_get_interface(struct ksz_device *dev, int port)
 {
 	phy_interface_t interface;
@@ -393,6 +433,8 @@ const struct dsa_switch_ops lan937x_switch_ops = {
 	.port_bridge_leave	= ksz_port_bridge_leave,
 	.port_stp_state_set	= lan937x_port_stp_state_set,
 	.port_fast_age		= ksz_port_fast_age,
+	.port_mirror_add	= lan937x_port_mirror_add,
+	.port_mirror_del	= lan937x_port_mirror_del,
 	.port_max_mtu		= lan937x_get_max_mtu,
 	.port_change_mtu	= lan937x_change_mtu,
 	.phylink_validate	= lan937x_phylink_validate,
-- 
2.25.1