net: dsa: tag_8021q: create dsa_tag_8021q_{register,unregister} helpers

In preparation of moving tag_8021q to core DSA, move all initialization
and teardown related to tag_8021q which is currently done by drivers in
2 functions called "register" and "unregister". These will gather more
functionality in future patches, which will better justify the chosen
naming scheme.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/felix.c

@@ -425,15 +425,11 @@ static int felix_setup_tag_8021q(struct dsa_switch *ds, int cpu)
 	ocelot_rmw_rix(ocelot, 0, cpu_flood, ANA_PGID_PGID, PGID_MC);
 	ocelot_rmw_rix(ocelot, 0, cpu_flood, ANA_PGID_PGID, PGID_BC);
 
-	felix->dsa_8021q_ctx = kzalloc(sizeof(*felix->dsa_8021q_ctx),
-				       GFP_KERNEL);
+	felix->dsa_8021q_ctx = dsa_tag_8021q_register(ds, &felix_tag_8021q_ops,
+						      htons(ETH_P_8021AD));
 	if (!felix->dsa_8021q_ctx)
 		return -ENOMEM;
 
-	felix->dsa_8021q_ctx->ops = &felix_tag_8021q_ops;
-	felix->dsa_8021q_ctx->proto = htons(ETH_P_8021AD);
-	felix->dsa_8021q_ctx->ds = ds;
-
 	err = dsa_8021q_setup(felix->dsa_8021q_ctx, true);
 	if (err)
 		goto out_free_dsa_8021_ctx;
@@ -447,7 +443,7 @@ static int felix_setup_tag_8021q(struct dsa_switch *ds, int cpu)
 out_teardown_dsa_8021q:
 	dsa_8021q_setup(felix->dsa_8021q_ctx, false);
 out_free_dsa_8021_ctx:
-	kfree(felix->dsa_8021q_ctx);
+	dsa_tag_8021q_unregister(felix->dsa_8021q_ctx);
 	return err;
 }
 
@@ -466,7 +462,7 @@ static void felix_teardown_tag_8021q(struct dsa_switch *ds, int cpu)
 	if (err)
 		dev_err(ds->dev, "dsa_8021q_setup returned %d", err);
 
-	kfree(felix->dsa_8021q_ctx);
+	dsa_tag_8021q_unregister(felix->dsa_8021q_ctx);
 
 	for (port = 0; port < ds->num_ports; port++) {
 		if (dsa_is_unused_port(ds, port))

drivers/net/dsa/sja1105/sja1105_main.c

@@ -3306,16 +3306,11 @@ static int sja1105_probe(struct spi_device *spi)
 	mutex_init(&priv->ptp_data.lock);
 	mutex_init(&priv->mgmt_lock);
 
-	priv->dsa_8021q_ctx = devm_kzalloc(dev, sizeof(*priv->dsa_8021q_ctx),
-					   GFP_KERNEL);
+	priv->dsa_8021q_ctx = dsa_tag_8021q_register(ds, &sja1105_dsa_8021q_ops,
+						     htons(ETH_P_8021Q));
 	if (!priv->dsa_8021q_ctx)
 		return -ENOMEM;
 
-	priv->dsa_8021q_ctx->ops = &sja1105_dsa_8021q_ops;
-	priv->dsa_8021q_ctx->proto = htons(ETH_P_8021Q);
-	priv->dsa_8021q_ctx->ds = ds;
-
-	INIT_LIST_HEAD(&priv->dsa_8021q_ctx->crosschip_links);
 	INIT_LIST_HEAD(&priv->bridge_vlans);
 	INIT_LIST_HEAD(&priv->dsa_8021q_vlans);
 
@@ -3324,7 +3319,7 @@ static int sja1105_probe(struct spi_device *spi)
 
 	rc = dsa_register_switch(priv->ds);
 	if (rc)
-		return rc;
+		goto out_tag_8021q_unregister;
 
 	if (IS_ENABLED(CONFIG_NET_SCH_CBS)) {
 		priv->cbs = devm_kcalloc(dev, priv->info->num_cbs_shapers,
@@ -3377,6 +3372,8 @@ static int sja1105_probe(struct spi_device *spi)
 
 out_unregister_switch:
 	dsa_unregister_switch(ds);
+out_tag_8021q_unregister:
+	dsa_tag_8021q_unregister(priv->dsa_8021q_ctx);
 
 	return rc;
 }
@@ -3384,8 +3381,11 @@ static int sja1105_probe(struct spi_device *spi)
 static int sja1105_remove(struct spi_device *spi)
 {
 	struct sja1105_private *priv = spi_get_drvdata(spi);
+	struct dsa_switch *ds = priv->ds;
+
+	dsa_unregister_switch(ds);
+	dsa_tag_8021q_unregister(priv->dsa_8021q_ctx);
 
-	dsa_unregister_switch(priv->ds);
 	return 0;
 }
 

include/linux/dsa/8021q.h

@@ -34,6 +34,12 @@ struct dsa_8021q_context {
 	__be16 proto;
 };
 
+struct dsa_8021q_context *dsa_tag_8021q_register(struct dsa_switch *ds,
+						 const struct dsa_8021q_ops *ops,
+						 __be16 proto);
+
+void dsa_tag_8021q_unregister(struct dsa_8021q_context *ctx);
+
 int dsa_8021q_setup(struct dsa_8021q_context *ctx, bool enabled);
 
 int dsa_8021q_crosschip_bridge_join(struct dsa_8021q_context *ctx, int port,

net/dsa/tag_8021q.c

@@ -410,6 +410,39 @@ int dsa_8021q_crosschip_bridge_leave(struct dsa_8021q_context *ctx, int port,
 }
 EXPORT_SYMBOL_GPL(dsa_8021q_crosschip_bridge_leave);
 
+struct dsa_8021q_context *dsa_tag_8021q_register(struct dsa_switch *ds,
+						 const struct dsa_8021q_ops *ops,
+						 __be16 proto)
+{
+	struct dsa_8021q_context *ctx;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return NULL;
+
+	ctx->ops = ops;
+	ctx->proto = proto;
+	ctx->ds = ds;
+
+	INIT_LIST_HEAD(&ctx->crosschip_links);
+
+	return ctx;
+}
+EXPORT_SYMBOL_GPL(dsa_tag_8021q_register);
+
+void dsa_tag_8021q_unregister(struct dsa_8021q_context *ctx)
+{
+	struct dsa_8021q_crosschip_link *c, *n;
+
+	list_for_each_entry_safe(c, n, &ctx->crosschip_links, list) {
+		list_del(&c->list);
+		kfree(c);
+	}
+
+	kfree(ctx);
+}
+EXPORT_SYMBOL_GPL(dsa_tag_8021q_unregister);
+
 struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,
 			       u16 tpid, u16 tci)
 {