[PATCH v2 net-next 7/9] net: dsa: microchip: add support for port mirror operations

[Prasanna Vengateshan <prasanna.vengateshan@xxxxxxxxxxxxx>]

Added support for port_mirror_add() and port_mirror_del operations

Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@xxxxxxxxxxxxx>
---
 drivers/net/dsa/microchip/lan937x_main.c | 50 ++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 573d2dd906f5..bfce5098ea69 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -128,6 +128,54 @@ 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;
+	int rc;
+
+	if (ingress)
+		rc = lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_RX, true);
+	else
+		rc = lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_TX, true);
+
+	if (rc < 0)
+		return rc;
+
+	rc = lan937x_port_cfg(dev, port, P_MIRROR_CTRL, PORT_MIRROR_SNIFFER, false);
+	if (rc < 0)
+		return rc;
+
+	/* configure mirror port */
+	rc = lan937x_port_cfg(dev, mirror->to_local_port, P_MIRROR_CTRL,
+			      PORT_MIRROR_SNIFFER, true);
+	if (rc < 0)
+		return rc;
+
+	rc = lan937x_cfg(dev, S_MIRROR_CTRL, SW_MIRROR_RX_TX, false);
+
+	return rc;
+}
+
+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;
@@ -396,6 +444,8 @@ const struct dsa_switch_ops lan937x_switch_ops = {
 	.port_bridge_flags	= lan937x_port_bridge_flags,
 	.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,
-- 
2.27.0