net: dsa: Allow the DSA driver to indicate the tag protocol

DSA drivers may drive different families of switches which need
different tag protocol. Rather than hard code the tag protocol in the
driver structure, have a callback for the DSA core to call.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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,

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,

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,

drivers/net/dsa/mv88e6xxx/chip.c

@@ -3924,6 +3924,11 @@ static int mv88e6xxx_smi_init(struct mv88e6xxx_chip *chip,
 	return 0;
 }
 
+static enum dsa_tag_protocol mv88e6xxx_get_tag_protocol(struct dsa_switch *ds)
+{
+	return DSA_TAG_PROTO_EDSA;
+}
+
 static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
 				       struct device *host_dev, int sw_addr,
 				       void **priv)
@@ -3967,8 +3972,8 @@ 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,

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);

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;

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);