Merge branch 'net-Remove-switchdev_ops'

Florian Fainelli says:

====================
net: Remove switchdev_ops

This patch series completes the removal of the switchdev_ops by
converting switchdev_port_attr_set() to use either the blocking
(process) or non-blocking (atomic) notifier since we typically need to
deal with both depending on where in the bridge code we get called from.

This was tested with the forwarding selftests and DSA hardware.

Ido, hopefully this captures your comments done on v1, if not, can you
illustrate with some pseudo-code what you had in mind if that's okay?

Changes in v3:

- added Reviewed-by tags from Ido where relevant
- added missing notifier_to_errno() in net/bridge/br_switchdev.c when
  calling the atomic notifier for PRE_BRIDGE_FLAGS
- kept mlxsw_sp_switchdev_init() in mlxsw/

Changes in v2:

- do not check for SWITCHDEV_F_DEFER when calling the blocking notifier
  and instead directly call the atomic notifier from the single location
  where this is required
====================

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

1 files changed, 75 insertions, 29 deletions

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 362413c9b389..d81cfcee9ad9 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -174,39 +174,32 @@ static int switchdev_deferred_enqueue(struct net_device *dev,
 	return 0;
 }
 
-static int __switchdev_port_attr_set(struct net_device *dev,
-				     const struct switchdev_attr *attr,
-				     struct switchdev_trans *trans)
+static int switchdev_port_attr_notify(enum switchdev_notifier_type nt,
+				      struct net_device *dev,
+				      const struct switchdev_attr *attr,
+				      struct switchdev_trans *trans)
 {
-	const struct switchdev_ops *ops = dev->switchdev_ops;
-	struct net_device *lower_dev;
-	struct list_head *iter;
-	int err = -EOPNOTSUPP;
-
-	if (ops && ops->switchdev_port_attr_set) {
-		err = ops->switchdev_port_attr_set(dev, attr, trans);
-		goto done;
-	}
-
-	if (attr->flags & SWITCHDEV_F_NO_RECURSE)
-		goto done;
+	int err;
+	int rc;
 
-	/* Switch device port(s) may be stacked under
-	 * bond/team/vlan dev, so recurse down to set attr on
-	 * each port.
-	 */
+	struct switchdev_notifier_port_attr_info attr_info = {
+		.attr = attr,
+		.trans = trans,
+		.handled = false,
+	};
 
-	netdev_for_each_lower_dev(dev, lower_dev, iter) {
-		err = __switchdev_port_attr_set(lower_dev, attr, trans);
-		if (err)
-			break;
+	rc = call_switchdev_blocking_notifiers(nt, dev,
+					       &attr_info.info, NULL);
+	err = notifier_to_errno(rc);
+	if (err) {
+		WARN_ON(!attr_info.handled);
+		return err;
 	}
 
-done:
-	if (err == -EOPNOTSUPP && attr->flags & SWITCHDEV_F_SKIP_EOPNOTSUPP)
-		err = 0;
+	if (!attr_info.handled)
+		return -EOPNOTSUPP;
 
-	return err;
+	return 0;
 }
 
 static int switchdev_port_attr_set_now(struct net_device *dev,
@@ -225,7 +218,8 @@ static int switchdev_port_attr_set_now(struct net_device *dev,
 	 */
 
 	trans.ph_prepare = true;
-	err = __switchdev_port_attr_set(dev, attr, &trans);
+	err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
+					 &trans);
 	if (err) {
 		/* Prepare phase failed: abort the transaction.  Any
 		 * resources reserved in the prepare phase are
@@ -244,7 +238,8 @@ static int switchdev_port_attr_set_now(struct net_device *dev,
 	 */
 
 	trans.ph_prepare = false;
-	err = __switchdev_port_attr_set(dev, attr, &trans);
+	err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
+					 &trans);
 	WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
 	     dev->name, attr->id);
 	switchdev_trans_items_warn_destroy(dev, &trans);
@@ -655,3 +650,54 @@ int switchdev_handle_port_obj_del(struct net_device *dev,
 	return err;
 }
 EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del);
+
+static int __switchdev_handle_port_attr_set(struct net_device *dev,
+			struct switchdev_notifier_port_attr_info *port_attr_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*set_cb)(struct net_device *dev,
+				      const struct switchdev_attr *attr,
+				      struct switchdev_trans *trans))
+{
+	struct net_device *lower_dev;
+	struct list_head *iter;
+	int err = -EOPNOTSUPP;
+
+	if (check_cb(dev)) {
+		port_attr_info->handled = true;
+		return set_cb(dev, port_attr_info->attr,
+			      port_attr_info->trans);
+	}
+
+	/* Switch ports might be stacked under e.g. a LAG. Ignore the
+	 * unsupported devices, another driver might be able to handle them. But
+	 * propagate to the callers any hard errors.
+	 *
+	 * If the driver does its own bookkeeping of stacked ports, it's not
+	 * necessary to go through this helper.
+	 */
+	netdev_for_each_lower_dev(dev, lower_dev, iter) {
+		err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
+						       check_cb, set_cb);
+		if (err && err != -EOPNOTSUPP)
+			return err;
+	}
+
+	return err;
+}
+
+int switchdev_handle_port_attr_set(struct net_device *dev,
+			struct switchdev_notifier_port_attr_info *port_attr_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*set_cb)(struct net_device *dev,
+				      const struct switchdev_attr *attr,
+				      struct switchdev_trans *trans))
+{
+	int err;
+
+	err = __switchdev_handle_port_attr_set(dev, port_attr_info, check_cb,
+					       set_cb);
+	if (err == -EOPNOTSUPP)
+		err = 0;
+	return err;
+}
+EXPORT_SYMBOL_GPL(switchdev_handle_port_attr_set);