Merge branch 'dsa-fix-MV88E6131-tagging'

Andrew Lunn says:

====================
Fix MV88E6131 tagging

Marvell has two different tagging protocols for frames passed to a
swicth. There is the older DSA and the newer EDSA. Somewhere along the
way, we broke support for switches which only support DSA, by trying
to configure them to use EDSA. These patches add back support for
switches which only support DSA, by allowing the drivers to
dynamically indicate the tagging protocol they support to the DSA
core. This needs to be dynamic since the mv88e6xxx has to support two
protocols.

Thanks go to Jamie Lentin for reporting the problem, helping debug it,
providing some of the fix, and testing.
====================

Tested-By: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

9 files changed, 78 insertions, 35 deletions

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 38ee10de7884..65ecb51f99e5 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1373,8 +1373,13 @@ static void b53_br_set_stp_state(struct dsa_switch *ds, int port,
 	b53_write8(dev, B53_CTRL_PAGE, B53_PORT_CTRL(port), reg);
 }
 
+static enum dsa_tag_protocol b53_get_tag_protocol(struct dsa_switch *ds)
+{
+	return DSA_TAG_PROTO_NONE;
+}
+
 static struct dsa_switch_driver b53_switch_ops = {
-	.tag_protocol		= DSA_TAG_PROTO_NONE,
+	.get_tag_protocol	= b53_get_tag_protocol,
 	.setup			= b53_setup,
 	.set_addr		= b53_set_addr,
 	.get_strings		= b53_get_strings,
diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 8e6fe13dbec3..b47a74b37a42 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -136,6 +136,11 @@ static int bcm_sf2_sw_get_sset_count(struct dsa_switch *ds)
 	return BCM_SF2_STATS_SIZE;
 }
 
+static enum dsa_tag_protocol bcm_sf2_sw_get_tag_protocol(struct dsa_switch *ds)
+{
+	return DSA_TAG_PROTO_BRCM;
+}
+
 static void bcm_sf2_imp_vlan_setup(struct dsa_switch *ds, int cpu_port)
 {
 	struct bcm_sf2_priv *priv = ds_to_priv(ds);
@@ -1577,8 +1582,8 @@ static int bcm_sf2_sw_setup(struct dsa_switch *ds)
 }
 
 static struct dsa_switch_driver bcm_sf2_switch_driver = {
-	.tag_protocol		= DSA_TAG_PROTO_BRCM,
 	.setup			= bcm_sf2_sw_setup,
+	.get_tag_protocol	= bcm_sf2_sw_get_tag_protocol,
 	.set_addr		= bcm_sf2_sw_set_addr,
 	.get_phy_flags		= bcm_sf2_sw_get_phy_flags,
 	.get_strings		= bcm_sf2_sw_get_strings,
diff --git a/drivers/net/dsa/mv88e6060.c b/drivers/net/dsa/mv88e6060.c
index e36b40886bd8..1fdfbf3a50bc 100644
--- a/drivers/net/dsa/mv88e6060.c
+++ b/drivers/net/dsa/mv88e6060.c
@@ -69,6 +69,11 @@ static const char *mv88e6060_get_name(struct mii_bus *bus, int sw_addr)
 	return NULL;
 }
 
+static enum dsa_tag_protocol mv88e6060_get_tag_protocol(struct dsa_switch *ds)
+{
+	return DSA_TAG_PROTO_TRAILER;
+}
+
 static const char *mv88e6060_drv_probe(struct device *dsa_dev,
 				       struct device *host_dev, int sw_addr,
 				       void **_priv)
@@ -248,7 +253,7 @@ mv88e6060_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 }
 
 static struct dsa_switch_driver mv88e6060_switch_driver = {
-	.tag_protocol	= DSA_TAG_PROTO_TRAILER,
+	.get_tag_protocol = mv88e6060_get_tag_protocol,
 	.probe		= mv88e6060_drv_probe,
 	.setup		= mv88e6060_setup,
 	.set_addr	= mv88e6060_set_addr,
diff --git a/drivers/net/dsa/mv88e6xxx/Kconfig b/drivers/net/dsa/mv88e6xxx/Kconfig
index 490bc06f993e..ac77737bbd87 100644
--- a/drivers/net/dsa/mv88e6xxx/Kconfig
+++ b/drivers/net/dsa/mv88e6xxx/Kconfig
@@ -2,6 +2,7 @@ config NET_DSA_MV88E6XXX
 	tristate "Marvell 88E6xxx Ethernet switch fabric support"
 	depends on NET_DSA
 	select NET_DSA_TAG_EDSA
+	select NET_DSA_TAG_DSA
 	help
 	  This driver adds support for most of the Marvell 88E6xxx models of
 	  Ethernet switch chips, except 88E6060.
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 014b52bd72f1..82d45165803c 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -486,6 +486,11 @@ static void mv88e6xxx_ppu_state_init(struct mv88e6xxx_chip *chip)
 	chip->ppu_timer.function = mv88e6xxx_ppu_reenable_timer;
 }
 
+static void mv88e6xxx_ppu_state_destroy(struct mv88e6xxx_chip *chip)
+{
+	del_timer_sync(&chip->ppu_timer);
+}
+
 static int mv88e6xxx_phy_ppu_read(struct mv88e6xxx_chip *chip, int addr,
 				  int reg, u16 *val)
 {
@@ -2483,28 +2488,13 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
 		PORT_CONTROL_USE_TAG | PORT_CONTROL_USE_IP |
 		PORT_CONTROL_STATE_FORWARDING;
 	if (dsa_is_cpu_port(ds, port)) {
-		if (mv88e6xxx_6095_family(chip) || mv88e6xxx_6185_family(chip))
-			reg |= PORT_CONTROL_DSA_TAG;
-		if (mv88e6xxx_6352_family(chip) ||
-		    mv88e6xxx_6351_family(chip) ||
-		    mv88e6xxx_6165_family(chip) ||
-		    mv88e6xxx_6097_family(chip) ||
-		    mv88e6xxx_6320_family(chip)) {
+		if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_EDSA))
 			reg |= PORT_CONTROL_FRAME_ETHER_TYPE_DSA |
-				PORT_CONTROL_FORWARD_UNKNOWN |
 				PORT_CONTROL_FORWARD_UNKNOWN_MC;
-		}
-
-		if (mv88e6xxx_6352_family(chip) ||
-		    mv88e6xxx_6351_family(chip) ||
-		    mv88e6xxx_6165_family(chip) ||
-		    mv88e6xxx_6097_family(chip) ||
-		    mv88e6xxx_6095_family(chip) ||
-		    mv88e6xxx_6065_family(chip) ||
-		    mv88e6xxx_6185_family(chip) ||
-		    mv88e6xxx_6320_family(chip)) {
-			reg |= PORT_CONTROL_EGRESS_ADD_TAG;
-		}
+		else
+			reg |= PORT_CONTROL_DSA_TAG;
+		reg |= PORT_CONTROL_EGRESS_ADD_TAG |
+			PORT_CONTROL_FORWARD_UNKNOWN;
 	}
 	if (dsa_is_dsa_port(ds, port)) {
 		if (mv88e6xxx_6095_family(chip) ||
@@ -2632,10 +2622,13 @@ static int mv88e6xxx_setup_port(struct mv88e6xxx_chip *chip, int port)
 		/* Port Ethertype: use the Ethertype DSA Ethertype
 		 * value.
 		 */
-		ret = _mv88e6xxx_reg_write(chip, REG_PORT(port),
-					   PORT_ETH_TYPE, ETH_P_EDSA);
-		if (ret)
-			return ret;
+		if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_EDSA)) {
+			ret = _mv88e6xxx_reg_write(chip, REG_PORT(port),
+						   PORT_ETH_TYPE, ETH_P_EDSA);
+			if (ret)
+				return ret;
+		}
+
 		/* Tag Remap: use an identity 802.1p prio -> switch
 		 * prio mapping.
 		 */
@@ -3904,6 +3897,13 @@ static void mv88e6xxx_phy_init(struct mv88e6xxx_chip *chip)
 	}
 }
 
+static void mv88e6xxx_phy_destroy(struct mv88e6xxx_chip *chip)
+{
+	if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_PPU)) {
+		mv88e6xxx_ppu_state_destroy(chip);
+	}
+}
+
 static int mv88e6xxx_smi_init(struct mv88e6xxx_chip *chip,
 			      struct mii_bus *bus, int sw_addr)
 {
@@ -3924,6 +3924,16 @@ static int mv88e6xxx_smi_init(struct mv88e6xxx_chip *chip,
 	return 0;
 }
 
+static enum dsa_tag_protocol mv88e6xxx_get_tag_protocol(struct dsa_switch *ds)
+{
+	struct mv88e6xxx_chip *chip = ds_to_priv(ds);
+
+	if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_EDSA))
+		return DSA_TAG_PROTO_EDSA;
+
+	return DSA_TAG_PROTO_DSA;
+}
+
 static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
 				       struct device *host_dev, int sw_addr,
 				       void **priv)
@@ -3967,8 +3977,8 @@ free:
 }
 
 static struct dsa_switch_driver mv88e6xxx_switch_driver = {
-	.tag_protocol		= DSA_TAG_PROTO_EDSA,
 	.probe			= mv88e6xxx_drv_probe,
+	.get_tag_protocol	= mv88e6xxx_get_tag_protocol,
 	.setup			= mv88e6xxx_setup,
 	.set_addr		= mv88e6xxx_set_addr,
 	.adjust_link		= mv88e6xxx_adjust_link,
@@ -4082,6 +4092,7 @@ static void mv88e6xxx_remove(struct mdio_device *mdiodev)
 	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 	struct mv88e6xxx_chip *chip = ds_to_priv(ds);
 
+	mv88e6xxx_phy_destroy(chip);
 	mv88e6xxx_unregister_switch(chip);
 	mv88e6xxx_mdio_unregister(chip);
 }
diff --git a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
index 1f9bab5891b1..e157d4f69864 100644
--- a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
@@ -386,6 +386,12 @@ enum mv88e6xxx_family {
 };
 
 enum mv88e6xxx_cap {
+	/* Two different tag protocols can be used by the driver. All
+	 * switches support DSA, but only later generations support
+	 * EDSA.
+	 */
+	MV88E6XXX_CAP_EDSA,
+
 	/* Energy Efficient Ethernet.
 	 */
 	MV88E6XXX_CAP_EEE,
@@ -447,6 +453,7 @@ enum mv88e6xxx_cap {
 };
 
 /* Bitmask of capabilities */
+#define MV88E6XXX_FLAG_EDSA		BIT(MV88E6XXX_CAP_EDSA)
 #define MV88E6XXX_FLAG_EEE		BIT(MV88E6XXX_CAP_EEE)
 
 #define MV88E6XXX_FLAG_SMI_CMD		BIT(MV88E6XXX_CAP_SMI_CMD)
@@ -547,7 +554,8 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAG_VTU)
 
 #define MV88E6XXX_FLAGS_FAMILY_6320	\
-	(MV88E6XXX_FLAG_EEE |		\
+	(MV88E6XXX_FLAG_EDSA |		\
+	 MV88E6XXX_FLAG_EEE |		\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_0X |	\
@@ -564,7 +572,8 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAGS_SMI_PHY)
 
 #define MV88E6XXX_FLAGS_FAMILY_6351	\
-	(MV88E6XXX_FLAG_GLOBAL2 |	\
+	(MV88E6XXX_FLAG_EDSA |		\
+	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_0X |	\
 	 MV88E6XXX_FLAG_G2_SWITCH_MAC |	\
@@ -579,7 +588,8 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAGS_SMI_PHY)
 
 #define MV88E6XXX_FLAGS_FAMILY_6352	\
-	(MV88E6XXX_FLAG_EEE |		\
+	(MV88E6XXX_FLAG_EDSA |		\
+	 MV88E6XXX_FLAG_EEE |		\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_0X |	\
diff --git a/include/net/dsa.h b/include/net/dsa.h
index d00c392bc9f8..8ca2684c5358 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -239,14 +239,15 @@ struct switchdev_obj_port_vlan;
 struct dsa_switch_driver {
 	struct list_head	list;
 
-	enum dsa_tag_protocol	tag_protocol;
-
 	/*
 	 * Probing and setup.
 	 */
 	const char	*(*probe)(struct device *dsa_dev,
 				  struct device *host_dev, int sw_addr,
 				  void **priv);
+
+	enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds);
+
 	int	(*setup)(struct dsa_switch *ds);
 	int	(*set_addr)(struct dsa_switch *ds, u8 *addr);
 	u32	(*get_phy_flags)(struct dsa_switch *ds, int port);
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 8bda74e595a5..8d3a28d4e99d 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -354,7 +354,10 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 	 * switch.
 	 */
 	if (dst->cpu_switch == index) {
-		dst->tag_ops = dsa_resolve_tag_protocol(drv->tag_protocol);
+		enum dsa_tag_protocol tag_protocol;
+
+		tag_protocol = drv->get_tag_protocol(ds);
+		dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 		if (IS_ERR(dst->tag_ops)) {
 			ret = PTR_ERR(dst->tag_ops);
 			goto out;
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index f30bad9678f0..2e343221464c 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -443,6 +443,7 @@ static int dsa_cpu_parse(struct device_node *port, u32 index,
 			 struct dsa_switch_tree *dst,
 			 struct dsa_switch *ds)
 {
+	enum dsa_tag_protocol tag_protocol;
 	struct net_device *ethernet_dev;
 	struct device_node *ethernet;
 
@@ -465,7 +466,8 @@ static int dsa_cpu_parse(struct device_node *port, u32 index,
 		dst->cpu_port = index;
 	}
 
-	dst->tag_ops = dsa_resolve_tag_protocol(ds->drv->tag_protocol);
+	tag_protocol = ds->drv->get_tag_protocol(ds);
+	dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 	if (IS_ERR(dst->tag_ops)) {
 		dev_warn(ds->dev, "No tagger for this switch\n");
 		return PTR_ERR(dst->tag_ops);