Merge branch 'switchdev-callback'

Vivien Didelot says:

====================
net: switchdev: use specific switchdev_obj_*

This patchset changes switchdev add, del, dump operations from this:

    int     (*switchdev_port_obj_add)(struct net_device *dev,
                                      struct switchdev_obj *obj,
                                      struct switchdev_trans *trans);
    int     (*switchdev_port_obj_del)(struct net_device *dev,
                                      struct switchdev_obj *obj);
    int     (*switchdev_port_obj_dump)(struct net_device *dev,
                                      struct switchdev_obj *obj);

to something similar to the notifier_call callback of a notifier_block:

    int     (*switchdev_port_obj_add)(struct net_device *dev,
                                      enum switchdev_obj_id id,
                                      const void *obj,
                                      struct switchdev_trans *trans);
    int     (*switchdev_port_obj_del)(struct net_device *dev,
                                      enum switchdev_obj_id id,
                                      const void *obj);
    int     (*switchdev_port_obj_dump)(struct net_device *dev,
                                       enum switchdev_obj_id id, void *obj,
                                       int (*cb)(void *obj));

This allows the caller to pass and expect back a specific switchdev_obj_*
structure (e.g. switchdev_obj_fdb) instead of the generic switchdev_obj one.

This will simplify pushing the callback function down to the drivers.

The first 3 patches get rid of the dev parameter of the dump callback, since it
is not always neeeded (e.g. vlan_dump) and some drivers (such as DSA drivers)
may not have easy access to it.

Patches 4 and 5 implement the change in the switchdev operations and its users.

Patch 6 extracts the inner switchdev_obj_* structures from switchdev_obj and
removes this last one.

v2: fix error spotted by kbuild (extra ';' inline switchdev_port_obj_dump).
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/rocker/rocker.c

@@ -4437,26 +4437,25 @@ static int rocker_port_fdb_add(struct rocker_port *rocker_port,
 }
 
 static int rocker_port_obj_add(struct net_device *dev,
-			       struct switchdev_obj *obj,
+			       enum switchdev_obj_id id, const void *obj,
 			       struct switchdev_trans *trans)
 {
 	struct rocker_port *rocker_port = netdev_priv(dev);
 	const struct switchdev_obj_ipv4_fib *fib4;
 	int err = 0;
 
-	switch (obj->id) {
+	switch (id) {
 	case SWITCHDEV_OBJ_PORT_VLAN:
-		err = rocker_port_vlans_add(rocker_port, trans,
-					    &obj->u.vlan);
+		err = rocker_port_vlans_add(rocker_port, trans, obj);
 		break;
 	case SWITCHDEV_OBJ_IPV4_FIB:
-		fib4 = &obj->u.ipv4_fib;
+		fib4 = obj;
 		err = rocker_port_fib_ipv4(rocker_port, trans,
 					   htonl(fib4->dst), fib4->dst_len,
 					   fib4->fi, fib4->tb_id, 0);
 		break;
 	case SWITCHDEV_OBJ_PORT_FDB:
-		err = rocker_port_fdb_add(rocker_port, trans, &obj->u.fdb);
+		err = rocker_port_fdb_add(rocker_port, trans, obj);
 		break;
 	default:
 		err = -EOPNOTSUPP;
@@ -4509,25 +4508,25 @@ static int rocker_port_fdb_del(struct rocker_port *rocker_port,
 }
 
 static int rocker_port_obj_del(struct net_device *dev,
-			       struct switchdev_obj *obj)
+			       enum switchdev_obj_id id, const void *obj)
 {
 	struct rocker_port *rocker_port = netdev_priv(dev);
 	const struct switchdev_obj_ipv4_fib *fib4;
 	int err = 0;
 
-	switch (obj->id) {
+	switch (id) {
 	case SWITCHDEV_OBJ_PORT_VLAN:
-		err = rocker_port_vlans_del(rocker_port, &obj->u.vlan);
+		err = rocker_port_vlans_del(rocker_port, obj);
 		break;
 	case SWITCHDEV_OBJ_IPV4_FIB:
-		fib4 = &obj->u.ipv4_fib;
+		fib4 = obj;
 		err = rocker_port_fib_ipv4(rocker_port, NULL,
 					   htonl(fib4->dst), fib4->dst_len,
 					   fib4->fi, fib4->tb_id,
 					   ROCKER_OP_FLAG_REMOVE);
 		break;
 	case SWITCHDEV_OBJ_PORT_FDB:
-		err = rocker_port_fdb_del(rocker_port, NULL, &obj->u.fdb);
+		err = rocker_port_fdb_del(rocker_port, NULL, obj);
 		break;
 	default:
 		err = -EOPNOTSUPP;
@@ -4538,10 +4537,10 @@ static int rocker_port_obj_del(struct net_device *dev,
 }
 
 static int rocker_port_fdb_dump(const struct rocker_port *rocker_port,
-				struct switchdev_obj *obj)
+				struct switchdev_obj_fdb *fdb,
+				int (*cb)(void *obj))
 {
 	struct rocker *rocker = rocker_port->rocker;
-	struct switchdev_obj_fdb *fdb = &obj->u.fdb;
 	struct rocker_fdb_tbl_entry *found;
 	struct hlist_node *tmp;
 	unsigned long lock_flags;
@@ -4556,7 +4555,7 @@ static int rocker_port_fdb_dump(const struct rocker_port *rocker_port,
 		fdb->ndm_state = NUD_REACHABLE;
 		fdb->vid = rocker_port_vlan_to_vid(rocker_port,
 						   found->key.vlan_id);
-		err = obj->cb(rocker_port->dev, obj);
+		err = cb(fdb);
 		if (err)
 			break;
 	}
@@ -4566,9 +4565,9 @@ static int rocker_port_fdb_dump(const struct rocker_port *rocker_port,
 }
 
 static int rocker_port_vlan_dump(const struct rocker_port *rocker_port,
-				 struct switchdev_obj *obj)
+				 struct switchdev_obj_vlan *vlan,
+				int (*cb)(void *obj))
 {
-	struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 	u16 vid;
 	int err = 0;
 
@@ -4579,7 +4578,7 @@ static int rocker_port_vlan_dump(const struct rocker_port *rocker_port,
 		if (rocker_vlan_id_is_internal(htons(vid)))
 			vlan->flags |= BRIDGE_VLAN_INFO_PVID;
 		vlan->vid_begin = vlan->vid_end = vid;
-		err = obj->cb(rocker_port->dev, obj);
+		err = cb(vlan);
 		if (err)
 			break;
 	}
@@ -4588,17 +4587,18 @@ static int rocker_port_vlan_dump(const struct rocker_port *rocker_port,
 }
 
 static int rocker_port_obj_dump(struct net_device *dev,
-				struct switchdev_obj *obj)
+				enum switchdev_obj_id id, void *obj,
+				int (*cb)(void *obj))
 {
 	const struct rocker_port *rocker_port = netdev_priv(dev);
 	int err = 0;
 
-	switch (obj->id) {
+	switch (id) {
 	case SWITCHDEV_OBJ_PORT_FDB:
-		err = rocker_port_fdb_dump(rocker_port, obj);
+		err = rocker_port_fdb_dump(rocker_port, obj, cb);
 		break;
 	case SWITCHDEV_OBJ_PORT_VLAN:
-		err = rocker_port_vlan_dump(rocker_port, obj);
+		err = rocker_port_vlan_dump(rocker_port, obj, cb);
 		break;
 	default:
 		err = -EOPNOTSUPP;

include/net/switchdev.h

@@ -64,16 +64,15 @@ enum switchdev_obj_id {
 	SWITCHDEV_OBJ_PORT_FDB,
 };
 
-struct switchdev_obj {
-	enum switchdev_obj_id id;
-	int (*cb)(struct net_device *dev, struct switchdev_obj *obj);
-	union {
-		struct switchdev_obj_vlan {		/* PORT_VLAN */
+/* SWITCHDEV_OBJ_PORT_VLAN */
+struct switchdev_obj_vlan {
 	u16 flags;
 	u16 vid_begin;
 	u16 vid_end;
-		} vlan;
-		struct switchdev_obj_ipv4_fib {		/* IPV4_FIB */
+};
+
+/* SWITCHDEV_OBJ_IPV4_FIB */
+struct switchdev_obj_ipv4_fib {
 	u32 dst;
 	int dst_len;
 	struct fib_info *fi;
@@ -81,13 +80,13 @@ struct switchdev_obj {
 	u8 type;
 	u32 nlflags;
 	u32 tb_id;
-		} ipv4_fib;
-		struct switchdev_obj_fdb {		/* PORT_FDB */
+};
+
+/* SWITCHDEV_OBJ_PORT_FDB */
+struct switchdev_obj_fdb {
 	const unsigned char *addr;
 	u16 vid;
 	u16 ndm_state;
-		} fdb;
-	} u;
 };
 
 void switchdev_trans_item_enqueue(struct switchdev_trans *trans,
@@ -102,11 +101,11 @@ void *switchdev_trans_item_dequeue(struct switchdev_trans *trans);
  *
  * @switchdev_port_attr_set: Set a port attribute (see switchdev_attr).
  *
- * @switchdev_port_obj_add: Add an object to port (see switchdev_obj).
+ * @switchdev_port_obj_add: Add an object to port (see switchdev_obj_*).
  *
- * @switchdev_port_obj_del: Delete an object from port (see switchdev_obj).
+ * @switchdev_port_obj_del: Delete an object from port (see switchdev_obj_*).
  *
- * @switchdev_port_obj_dump: Dump port objects (see switchdev_obj).
+ * @switchdev_port_obj_dump: Dump port objects (see switchdev_obj_*).
  */
 struct switchdev_ops {
 	int	(*switchdev_port_attr_get)(struct net_device *dev,
@@ -115,12 +114,15 @@ struct switchdev_ops {
 					   struct switchdev_attr *attr,
 					   struct switchdev_trans *trans);
 	int	(*switchdev_port_obj_add)(struct net_device *dev,
-					  struct switchdev_obj *obj,
+					  enum switchdev_obj_id id,
+					  const void *obj,
 					  struct switchdev_trans *trans);
 	int	(*switchdev_port_obj_del)(struct net_device *dev,
-					  struct switchdev_obj *obj);
+					  enum switchdev_obj_id id,
+					  const void *obj);
 	int	(*switchdev_port_obj_dump)(struct net_device *dev,
-					  struct switchdev_obj *obj);
+					   enum switchdev_obj_id id, void *obj,
+					   int (*cb)(void *obj));
 };
 
 enum switchdev_notifier_type {
@@ -150,9 +152,12 @@ int switchdev_port_attr_get(struct net_device *dev,
 			    struct switchdev_attr *attr);
 int switchdev_port_attr_set(struct net_device *dev,
 			    struct switchdev_attr *attr);
-int switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj);
-int switchdev_port_obj_del(struct net_device *dev, struct switchdev_obj *obj);
-int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj);
+int switchdev_port_obj_add(struct net_device *dev, enum switchdev_obj_id id,
+			   const void *obj);
+int switchdev_port_obj_del(struct net_device *dev, enum switchdev_obj_id id,
+			   const void *obj);
+int switchdev_port_obj_dump(struct net_device *dev, enum switchdev_obj_id id,
+			    void *obj, int (*cb)(void *obj));
 int register_switchdev_notifier(struct notifier_block *nb);
 int unregister_switchdev_notifier(struct notifier_block *nb);
 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
@@ -197,19 +202,22 @@ static inline int switchdev_port_attr_set(struct net_device *dev,
 }
 
 static inline int switchdev_port_obj_add(struct net_device *dev,
-					 struct switchdev_obj *obj)
+					 enum switchdev_obj_id id,
+					 const void *obj)
 {
 	return -EOPNOTSUPP;
 }
 
 static inline int switchdev_port_obj_del(struct net_device *dev,
-					 struct switchdev_obj *obj)
+					 enum switchdev_obj_id id,
+					 const void *obj)
 {
 	return -EOPNOTSUPP;
 }
 
 static inline int switchdev_port_obj_dump(struct net_device *dev,
-					  struct switchdev_obj *obj)
+					  enum switchdev_obj_id id, void *obj,
+					  int (*cb)(void *obj))
 {
 	return -EOPNOTSUPP;
 }

net/bridge/br_fdb.c

@@ -133,15 +133,12 @@ static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
 
 static void fdb_del_external_learn(struct net_bridge_fdb_entry *f)
 {
-	struct switchdev_obj obj = {
-		.id = SWITCHDEV_OBJ_PORT_FDB,
-		.u.fdb = {
+	struct switchdev_obj_fdb fdb = {
 		.addr = f->addr.addr,
 		.vid = f->vlan_id,
-		},
 	};
 
-	switchdev_port_obj_del(f->dst->dev, &obj);
+	switchdev_port_obj_del(f->dst->dev, SWITCHDEV_OBJ_PORT_FDB, &fdb);
 }
 
 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)

net/bridge/br_vlan.c

@@ -80,16 +80,13 @@ static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
 	if (ops->ndo_vlan_rx_add_vid) {
 		err = vlan_vid_add(dev, br->vlan_proto, vid);
 	} else {
-		struct switchdev_obj vlan_obj = {
-			.id = SWITCHDEV_OBJ_PORT_VLAN,
-			.u.vlan = {
+		struct switchdev_obj_vlan v = {
 			.flags = flags,
 			.vid_begin = vid,
 			.vid_end = vid,
-			},
 		};
 
-		err = switchdev_port_obj_add(dev, &vlan_obj);
+		err = switchdev_port_obj_add(dev, SWITCHDEV_OBJ_PORT_VLAN, &v);
 		if (err == -EOPNOTSUPP)
 			err = 0;
 	}
@@ -132,15 +129,12 @@ static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
 	if (ops->ndo_vlan_rx_kill_vid) {
 		vlan_vid_del(dev, br->vlan_proto, vid);
 	} else {
-		struct switchdev_obj vlan_obj = {
-			.id = SWITCHDEV_OBJ_PORT_VLAN,
-			.u.vlan = {
+		struct switchdev_obj_vlan v = {
 			.vid_begin = vid,
 			.vid_end = vid,
-			},
 		};
 
-		err = switchdev_port_obj_del(dev, &vlan_obj);
+		err = switchdev_port_obj_del(dev, SWITCHDEV_OBJ_PORT_VLAN, &v);
 		if (err == -EOPNOTSUPP)
 			err = 0;
 	}

net/dsa/slave.c

@@ -242,10 +242,9 @@ static int dsa_bridge_check_vlan_range(struct dsa_switch *ds,
 }
 
 static int dsa_slave_port_vlan_add(struct net_device *dev,
-				   struct switchdev_obj *obj,
+				   const struct switchdev_obj_vlan *vlan,
 				   struct switchdev_trans *trans)
 {
-	struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->parent;
 	u16 vid;
@@ -279,9 +278,8 @@ static int dsa_slave_port_vlan_add(struct net_device *dev,
 }
 
 static int dsa_slave_port_vlan_del(struct net_device *dev,
-				   struct switchdev_obj *obj)
+				   const struct switchdev_obj_vlan *vlan)
 {
-	struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->parent;
 	u16 vid;
@@ -300,9 +298,9 @@ static int dsa_slave_port_vlan_del(struct net_device *dev,
 }
 
 static int dsa_slave_port_vlan_dump(struct net_device *dev,
-				    struct switchdev_obj *obj)
+				    struct switchdev_obj_vlan *vlan,
+				    int (*cb)(void *obj))
 {
-	struct switchdev_obj_vlan *vlan = &obj->u.vlan;
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->parent;
 	DECLARE_BITMAP(members, DSA_MAX_PORTS);
@@ -334,7 +332,7 @@ static int dsa_slave_port_vlan_dump(struct net_device *dev,
 		if (test_bit(p->port, untagged))
 			vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 
-		err = obj->cb(dev, obj);
+		err = cb(vlan);
 		if (err)
 			break;
 	}
@@ -343,10 +341,9 @@ static int dsa_slave_port_vlan_dump(struct net_device *dev,
 }
 
 static int dsa_slave_port_fdb_add(struct net_device *dev,
-				  struct switchdev_obj *obj,
+				  const struct switchdev_obj_fdb *fdb,
 				  struct switchdev_trans *trans)
 {
-	struct switchdev_obj_fdb *fdb = &obj->u.fdb;
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->parent;
 	int ret = -EOPNOTSUPP;
@@ -360,9 +357,8 @@ static int dsa_slave_port_fdb_add(struct net_device *dev,
 }
 
 static int dsa_slave_port_fdb_del(struct net_device *dev,
-				  struct switchdev_obj *obj)
+				  const struct switchdev_obj_fdb *fdb)
 {
-	struct switchdev_obj_fdb *fdb = &obj->u.fdb;
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->parent;
 	int ret = -EOPNOTSUPP;
@@ -374,7 +370,8 @@ static int dsa_slave_port_fdb_del(struct net_device *dev,
 }
 
 static int dsa_slave_port_fdb_dump(struct net_device *dev,
-				   struct switchdev_obj *obj)
+				   struct switchdev_obj_fdb *fdb,
+				   int (*cb)(void *obj))
 {
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	struct dsa_switch *ds = p->parent;
@@ -393,11 +390,11 @@ static int dsa_slave_port_fdb_dump(struct net_device *dev,
 		if (ret < 0)
 			break;
 
-		obj->u.fdb.addr = addr;
-		obj->u.fdb.vid = vid;
-		obj->u.fdb.ndm_state = is_static ? NUD_NOARP : NUD_REACHABLE;
+		fdb->addr = addr;
+		fdb->vid = vid;
+		fdb->ndm_state = is_static ? NUD_NOARP : NUD_REACHABLE;
 
-		ret = obj->cb(dev, obj);
+		ret = cb(fdb);
 		if (ret < 0)
 			break;
 	}
@@ -472,7 +469,7 @@ static int dsa_slave_port_attr_set(struct net_device *dev,
 }
 
 static int dsa_slave_port_obj_add(struct net_device *dev,
-				  struct switchdev_obj *obj,
+				  enum switchdev_obj_id id, const void *obj,
 				  struct switchdev_trans *trans)
 {
 	int err;
@@ -482,7 +479,7 @@ static int dsa_slave_port_obj_add(struct net_device *dev,
 	 * supported, return -EOPNOTSUPP.
 	 */
 
-	switch (obj->id) {
+	switch (id) {
 	case SWITCHDEV_OBJ_PORT_FDB:
 		err = dsa_slave_port_fdb_add(dev, obj, trans);
 		break;
@@ -498,11 +495,11 @@ static int dsa_slave_port_obj_add(struct net_device *dev,
 }
 
 static int dsa_slave_port_obj_del(struct net_device *dev,
-				  struct switchdev_obj *obj)
+				  enum switchdev_obj_id id, const void *obj)
 {
 	int err;
 
-	switch (obj->id) {
+	switch (id) {
 	case SWITCHDEV_OBJ_PORT_FDB:
 		err = dsa_slave_port_fdb_del(dev, obj);
 		break;
@@ -518,16 +515,17 @@ static int dsa_slave_port_obj_del(struct net_device *dev,
 }
 
 static int dsa_slave_port_obj_dump(struct net_device *dev,
-				   struct switchdev_obj *obj)
+				   enum switchdev_obj_id id, void *obj,
+				   int (*cb)(void *obj))
 {
 	int err;
 
-	switch (obj->id) {
+	switch (id) {
 	case SWITCHDEV_OBJ_PORT_FDB:
-		err = dsa_slave_port_fdb_dump(dev, obj);
+		err = dsa_slave_port_fdb_dump(dev, obj, cb);
 		break;
 	case SWITCHDEV_OBJ_PORT_VLAN:
-		err = dsa_slave_port_vlan_dump(dev, obj);
+		err = dsa_slave_port_vlan_dump(dev, obj, cb);
 		break;
 	default:
 		err = -EOPNOTSUPP;