Merge branch 'net-dsa-mv88e6xxx-Add-support-for-port-mirroring'

Iwan R Timmer says:

====================
net: dsa: mv88e6xxx: Add support for port mirroring

This patch series add support for port mirroring in the mv88e6xx switch driver.
The first patch changes the set_egress_port function to allow different egress
ports for egress and ingress traffic. The second patch adds the actual code for
port mirroring support.

Tested on a 88E6176 with:

tc qdisc add dev wan0 clsact
tc filter add dev wan0 ingress matchall skip_sw \
        action mirred egress mirror dev lan2
tc filter add dev wan0 egress matchall skip_sw \
        action mirred egress mirror dev lan3

Changes in v3

- Use enum for egress traffic direction
- Keep track of egress ports on mv88e6390
- Move booleans in struct for better structure packing

Changes in v2

- Support mirroring egress and ingress traffic to different ports
- Check for invalid configurations when multiple ports are mirrored
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 188 insertions, 20 deletions

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 0dbe6c8b9dc0..e8bf6ac1e0f4 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2390,7 +2390,14 @@ static int mv88e6xxx_setup_upstream_port(struct mv88e6xxx_chip *chip, int port)
 
 		if (chip->info->ops->set_egress_port) {
 			err = chip->info->ops->set_egress_port(chip,
-							       upstream_port);
+						MV88E6XXX_EGRESS_DIR_INGRESS,
+						upstream_port);
+			if (err)
+				return err;
+
+			err = chip->info->ops->set_egress_port(chip,
+						MV88E6XXX_EGRESS_DIR_EGRESS,
+						upstream_port);
 			if (err)
 				return err;
 		}
@@ -5243,6 +5250,80 @@ static int mv88e6xxx_port_mdb_del(struct dsa_switch *ds, int port,
 	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)
 {
@@ -5298,6 +5379,8 @@ static const struct dsa_switch_ops mv88e6xxx_switch_ops = {
 	.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,
diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index 65ce09bdcbcf..8a8e38bfb161 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -33,6 +33,11 @@ enum mv88e6xxx_egress_mode {
 	MV88E6XXX_EGRESS_MODE_ETHERTYPE,
 };
 
+enum mv88e6xxx_egress_direction {
+        MV88E6XXX_EGRESS_DIR_INGRESS,
+        MV88E6XXX_EGRESS_DIR_EGRESS,
+};
+
 enum mv88e6xxx_frame_mode {
 	MV88E6XXX_FRAME_MODE_NORMAL,
 	MV88E6XXX_FRAME_MODE_DSA,
@@ -228,6 +233,8 @@ struct mv88e6xxx_port {
 	u64 vtu_member_violation;
 	u64 vtu_miss_violation;
 	u8 cmode;
+	bool mirror_ingress;
+	bool mirror_egress;
 	unsigned int serdes_irq;
 };
 
@@ -311,6 +318,10 @@ 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];
 
@@ -465,7 +476,9 @@ struct mv88e6xxx_ops {
 	int (*stats_get_stats)(struct mv88e6xxx_chip *chip,  int port,
 			       uint64_t *data);
 	int (*set_cpu_port)(struct mv88e6xxx_chip *chip, int port);
-	int (*set_egress_port)(struct mv88e6xxx_chip *chip, int port);
+	int (*set_egress_port)(struct mv88e6xxx_chip *chip,
+			       enum mv88e6xxx_egress_direction direction,
+			       int port);
 
 #define MV88E6XXX_CASCADE_PORT_NONE		0xe
 #define MV88E6XXX_CASCADE_PORT_MULTIPLE		0xf
diff --git a/drivers/net/dsa/mv88e6xxx/global1.c b/drivers/net/dsa/mv88e6xxx/global1.c
index 25ec4c0ac589..120a65d3e3ef 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.c
+++ b/drivers/net/dsa/mv88e6xxx/global1.c
@@ -263,8 +263,11 @@ int mv88e6250_g1_ieee_pri_map(struct mv88e6xxx_chip *chip)
 /* Offset 0x1a: Monitor Control */
 /* Offset 0x1a: Monitor & MGMT Control on some devices */
 
-int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port)
+int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip,
+				 enum mv88e6xxx_egress_direction direction,
+				 int port)
 {
+	int *dest_port_chip;
 	u16 reg;
 	int err;
 
@@ -272,13 +275,28 @@ int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port)
 	if (err)
 		return err;
 
-	reg &= ~(MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK |
-		 MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK);
+	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);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	err = mv88e6xxx_g1_write(chip, MV88E6185_G1_MONITOR_CTL, reg);
+	if (!err)
+		*dest_port_chip = port;
 
-	reg |= port << __bf_shf(MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK) |
-		port << __bf_shf(MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK);
-
-	return mv88e6xxx_g1_write(chip, MV88E6185_G1_MONITOR_CTL, reg);
+	return err;
 }
 
 /* Older generations also call this the ARP destination. It has been
@@ -310,22 +328,32 @@ static int mv88e6390_g1_monitor_write(struct mv88e6xxx_chip *chip,
 	return mv88e6xxx_g1_write(chip, MV88E6390_G1_MONITOR_MGMT_CTL, reg);
 }
 
-int mv88e6390_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port)
+int mv88e6390_g1_set_egress_port(struct mv88e6xxx_chip *chip,
+				 enum mv88e6xxx_egress_direction direction,
+				 int port)
 {
+	int *dest_port_chip;
 	u16 ptr;
 	int err;
 
-	ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_INGRESS_DEST;
-	err = mv88e6390_g1_monitor_write(chip, ptr, port);
-	if (err)
-		return 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:
+		return -EINVAL;
+	}
 
-	ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_EGRESS_DEST;
 	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)
diff --git a/drivers/net/dsa/mv88e6xxx/global1.h b/drivers/net/dsa/mv88e6xxx/global1.h
index 342172275841..bc5a6b2bb1e4 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.h
+++ b/drivers/net/dsa/mv88e6xxx/global1.h
@@ -288,8 +288,12 @@ int mv88e6095_g1_stats_set_histogram(struct mv88e6xxx_chip *chip);
 int mv88e6390_g1_stats_set_histogram(struct mv88e6xxx_chip *chip);
 void mv88e6xxx_g1_stats_read(struct mv88e6xxx_chip *chip, int stat, u32 *val);
 int mv88e6xxx_g1_stats_clear(struct mv88e6xxx_chip *chip);
-int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port);
-int mv88e6390_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port);
+int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip,
+				 enum mv88e6xxx_egress_direction direction,
+				 int port);
+int mv88e6390_g1_set_egress_port(struct mv88e6xxx_chip *chip,
+				 enum mv88e6xxx_egress_direction direction,
+				 int port);
 int mv88e6095_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port);
 int mv88e6390_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port);
 int mv88e6390_g1_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip);
diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index 15ef81654b67..7fe256c5739d 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -1181,6 +1181,43 @@ int mv88e6095_port_set_upstream_port(struct mv88e6xxx_chip *chip, int port,
 	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)
 {
diff --git a/drivers/net/dsa/mv88e6xxx/port.h b/drivers/net/dsa/mv88e6xxx/port.h
index 03a480cd71b9..0ec4327c2b42 100644
--- a/drivers/net/dsa/mv88e6xxx/port.h
+++ b/drivers/net/dsa/mv88e6xxx/port.h
@@ -368,6 +368,9 @@ int mv88e6352_port_link_state(struct mv88e6xxx_chip *chip, int port,
 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);