From f0942e00a1abb6404ca4302c66497fc623676c11 Mon Sep 17 00:00:00 2001
From: Iwan R Timmer <irtimmer@gmail.com>
Date: Thu, 7 Nov 2019 22:11:14 +0100
Subject: [PATCH] net: dsa: mv88e6xxx: Add support for port mirroring

Add support for configuring port mirroring through the cls_matchall
classifier. We do a full ingress and/or egress capture towards a
capture port. It allows setting a different capture port for ingress
and egress traffic.

It keeps track of the mirrored ports and the destination ports to
prevent changes to the capture port while other ports are being
mirrored.

Signed-off-by: Iwan R Timmer <irtimmer@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/dsa/mv88e6xxx/chip.c    | 76 +++++++++++++++++++++++++++++
 drivers/net/dsa/mv88e6xxx/chip.h    |  6 +++
 drivers/net/dsa/mv88e6xxx/global1.c | 18 +++++--
 drivers/net/dsa/mv88e6xxx/port.c    | 37 ++++++++++++++
 drivers/net/dsa/mv88e6xxx/port.h    |  3 ++
 5 files changed, 136 insertions(+), 4 deletions(-)

--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -4929,6 +4929,80 @@ static int mv88e6xxx_port_mdb_del(struct
 	return err;
 }
 
+static int mv88e6xxx_port_mirror_add(struct dsa_switch *ds, int port,
+				     struct dsa_mall_mirror_tc_entry *mirror,
+				     bool ingress)
+{
+	enum mv88e6xxx_egress_direction direction = ingress ?
+						MV88E6XXX_EGRESS_DIR_INGRESS :
+						MV88E6XXX_EGRESS_DIR_EGRESS;
+	struct mv88e6xxx_chip *chip = ds->priv;
+	bool other_mirrors = false;
+	int i;
+	int err;
+
+	if (!chip->info->ops->set_egress_port)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&chip->reg_lock);
+	if ((ingress ? chip->ingress_dest_port : chip->egress_dest_port) !=
+	    mirror->to_local_port) {
+		for (i = 0; i < mv88e6xxx_num_ports(chip); i++)
+			other_mirrors |= ingress ?
+					 chip->ports[i].mirror_ingress :
+					 chip->ports[i].mirror_egress;
+
+		/* Can't change egress port when other mirror is active */
+		if (other_mirrors) {
+			err = -EBUSY;
+			goto out;
+		}
+
+		err = chip->info->ops->set_egress_port(chip,
+						       direction,
+						       mirror->to_local_port);
+		if (err)
+			goto out;
+	}
+
+	err = mv88e6xxx_port_set_mirror(chip, port, direction, true);
+out:
+	mutex_unlock(&chip->reg_lock);
+
+	return err;
+}
+
+static void mv88e6xxx_port_mirror_del(struct dsa_switch *ds, int port,
+				      struct dsa_mall_mirror_tc_entry *mirror)
+{
+	enum mv88e6xxx_egress_direction direction = mirror->ingress ?
+						MV88E6XXX_EGRESS_DIR_INGRESS :
+						MV88E6XXX_EGRESS_DIR_EGRESS;
+	struct mv88e6xxx_chip *chip = ds->priv;
+	bool other_mirrors = false;
+	int i;
+
+	mutex_lock(&chip->reg_lock);
+	if (mv88e6xxx_port_set_mirror(chip, port, direction, false))
+		dev_err(ds->dev, "p%d: failed to disable mirroring\n", port);
+
+	for (i = 0; i < mv88e6xxx_num_ports(chip); i++)
+		other_mirrors |= mirror->ingress ?
+				 chip->ports[i].mirror_ingress :
+				 chip->ports[i].mirror_egress;
+
+	/* Reset egress port when no other mirror is active */
+	if (!other_mirrors) {
+		if (chip->info->ops->set_egress_port(chip,
+						     direction,
+						     dsa_upstream_port(ds,
+								       port)));
+			dev_err(ds->dev, "failed to set egress port\n");
+	}
+
+	mutex_unlock(&chip->reg_lock);
+}
+
 static int mv88e6xxx_port_egress_floods(struct dsa_switch *ds, int port,
 					 bool unicast, bool multicast)
 {
@@ -4983,6 +5057,8 @@ static const struct dsa_switch_ops mv88e
 	.port_mdb_prepare       = mv88e6xxx_port_mdb_prepare,
 	.port_mdb_add           = mv88e6xxx_port_mdb_add,
 	.port_mdb_del           = mv88e6xxx_port_mdb_del,
+	.port_mirror_add	= mv88e6xxx_port_mirror_add,
+	.port_mirror_del	= mv88e6xxx_port_mirror_del,
 	.crosschip_bridge_join	= mv88e6xxx_crosschip_bridge_join,
 	.crosschip_bridge_leave	= mv88e6xxx_crosschip_bridge_leave,
 	.port_hwtstamp_set	= mv88e6xxx_port_hwtstamp_set,
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -232,6 +232,8 @@ struct mv88e6xxx_port {
 	u64 vtu_member_violation;
 	u64 vtu_miss_violation;
 	u8 cmode;
+	bool mirror_ingress;
+	bool mirror_egress;
 	unsigned int serdes_irq;
 };
 
@@ -315,6 +317,10 @@ struct mv88e6xxx_chip {
 	u16 evcap_config;
 	u16 enable_count;
 
+	/* Current ingress and egress monitor ports */
+	int egress_dest_port;
+	int ingress_dest_port;
+
 	/* Per-port timestamping resources. */
 	struct mv88e6xxx_port_hwtstamp port_hwtstamp[DSA_MAX_PORTS];
 
--- a/drivers/net/dsa/mv88e6xxx/global1.c
+++ b/drivers/net/dsa/mv88e6xxx/global1.c
@@ -298,6 +298,7 @@ int mv88e6095_g1_set_egress_port(struct
 				 enum mv88e6xxx_egress_direction direction,
 				 int port)
 {
+	int *dest_port_chip;
 	u16 reg;
 	int err;
 
@@ -307,11 +308,13 @@ int mv88e6095_g1_set_egress_port(struct
 
 	switch (direction) {
 	case MV88E6XXX_EGRESS_DIR_INGRESS:
+		dest_port_chip = &chip->ingress_dest_port;
 		reg &= MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK;
 		reg |= port <<
 		       __bf_shf(MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK);
 		break;
 	case MV88E6XXX_EGRESS_DIR_EGRESS:
+		dest_port_chip = &chip->egress_dest_port;
 		reg &= MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK;
 		reg |= port <<
 		       __bf_shf(MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK);
@@ -320,7 +323,11 @@ int mv88e6095_g1_set_egress_port(struct
 		return -EINVAL;
 	}
 
-	return mv88e6xxx_g1_write(chip, MV88E6185_G1_MONITOR_CTL, reg);
+	err = mv88e6xxx_g1_write(chip, MV88E6185_G1_MONITOR_CTL, reg);
+	if (!err)
+		*dest_port_chip = port;
+
+	return err;
 }
 
 /* Older generations also call this the ARP destination. It has been
@@ -356,14 +363,17 @@ int mv88e6390_g1_set_egress_port(struct
 				 enum mv88e6xxx_egress_direction direction,
 				 int port)
 {
+	int *dest_port_chip;
 	u16 ptr;
 	int err;
 
 	switch (direction) {
 	case MV88E6XXX_EGRESS_DIR_INGRESS:
+		dest_port_chip = &chip->ingress_dest_port;
 		ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_INGRESS_DEST;
 		break;
 	case MV88E6XXX_EGRESS_DIR_EGRESS:
+		dest_port_chip = &chip->egress_dest_port;
 		ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_EGRESS_DEST;
 		break;
 	default:
@@ -371,10 +381,10 @@ int mv88e6390_g1_set_egress_port(struct
 	}
 
 	err = mv88e6390_g1_monitor_write(chip, ptr, port);
-	if (err)
-		return err;
+	if (!err)
+		*dest_port_chip = port;
 
-	return 0;
+	return err;
 }
 
 int mv88e6390_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port)
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -1181,6 +1181,43 @@ int mv88e6095_port_set_upstream_port(str
 	return mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_CTL2, reg);
 }
 
+int mv88e6xxx_port_set_mirror(struct mv88e6xxx_chip *chip, int port,
+			      enum mv88e6xxx_egress_direction direction,
+			      bool mirror)
+{
+	bool *mirror_port;
+	u16 reg;
+	u16 bit;
+	int err;
+
+	err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_CTL2, &reg);
+	if (err)
+		return err;
+
+	switch (direction) {
+	case MV88E6XXX_EGRESS_DIR_INGRESS:
+		bit = MV88E6XXX_PORT_CTL2_INGRESS_MONITOR;
+		mirror_port = &chip->ports[port].mirror_ingress;
+		break;
+	case MV88E6XXX_EGRESS_DIR_EGRESS:
+		bit = MV88E6XXX_PORT_CTL2_EGRESS_MONITOR;
+		mirror_port = &chip->ports[port].mirror_egress;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	reg &= ~bit;
+	if (mirror)
+		reg |= bit;
+
+	err = mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_CTL2, reg);
+	if (!err)
+		*mirror_port = mirror;
+
+	return err;
+}
+
 int mv88e6xxx_port_set_8021q_mode(struct mv88e6xxx_chip *chip, int port,
 				  u16 mode)
 {
--- a/drivers/net/dsa/mv88e6xxx/port.h
+++ b/drivers/net/dsa/mv88e6xxx/port.h
@@ -368,6 +368,9 @@ int mv88e6352_port_link_state(struct mv8
 int mv88e6xxx_port_set_map_da(struct mv88e6xxx_chip *chip, int port);
 int mv88e6095_port_set_upstream_port(struct mv88e6xxx_chip *chip, int port,
 				     int upstream_port);
+int mv88e6xxx_port_set_mirror(struct mv88e6xxx_chip *chip, int port,
+			      enum mv88e6xxx_egress_direction direction,
+			      bool mirror);
 
 int mv88e6xxx_port_disable_learn_limit(struct mv88e6xxx_chip *chip, int port);
 int mv88e6xxx_port_disable_pri_override(struct mv88e6xxx_chip *chip, int port);
