Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 614 insertions, 0 deletions

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
new file mode 100644
index 000000000..2c1ffc9ba
--- /dev/null
+++ b/net/switchdev/switchdev.c
@@ -0,0 +1,614 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/switchdev/switchdev.c - Switch device API
+ * Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
+ * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_bridge.h>
+#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/if_vlan.h>
+#include <linux/rtnetlink.h>
+#include <net/switchdev.h>
+
+static LIST_HEAD(deferred);
+static DEFINE_SPINLOCK(deferred_lock);
+
+typedef void switchdev_deferred_func_t(struct net_device *dev,
+				       const void *data);
+
+struct switchdev_deferred_item {
+	struct list_head list;
+	struct net_device *dev;
+	switchdev_deferred_func_t *func;
+	unsigned long data[];
+};
+
+static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
+{
+	struct switchdev_deferred_item *dfitem;
+
+	spin_lock_bh(&deferred_lock);
+	if (list_empty(&deferred)) {
+		dfitem = NULL;
+		goto unlock;
+	}
+	dfitem = list_first_entry(&deferred,
+				  struct switchdev_deferred_item, list);
+	list_del(&dfitem->list);
+unlock:
+	spin_unlock_bh(&deferred_lock);
+	return dfitem;
+}
+
+/**
+ *	switchdev_deferred_process - Process ops in deferred queue
+ *
+ *	Called to flush the ops currently queued in deferred ops queue.
+ *	rtnl_lock must be held.
+ */
+void switchdev_deferred_process(void)
+{
+	struct switchdev_deferred_item *dfitem;
+
+	ASSERT_RTNL();
+
+	while ((dfitem = switchdev_deferred_dequeue())) {
+		dfitem->func(dfitem->dev, dfitem->data);
+		dev_put(dfitem->dev);
+		kfree(dfitem);
+	}
+}
+EXPORT_SYMBOL_GPL(switchdev_deferred_process);
+
+static void switchdev_deferred_process_work(struct work_struct *work)
+{
+	rtnl_lock();
+	switchdev_deferred_process();
+	rtnl_unlock();
+}
+
+static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
+
+static int switchdev_deferred_enqueue(struct net_device *dev,
+				      const void *data, size_t data_len,
+				      switchdev_deferred_func_t *func)
+{
+	struct switchdev_deferred_item *dfitem;
+
+	dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC);
+	if (!dfitem)
+		return -ENOMEM;
+	dfitem->dev = dev;
+	dfitem->func = func;
+	memcpy(dfitem->data, data, data_len);
+	dev_hold(dev);
+	spin_lock_bh(&deferred_lock);
+	list_add_tail(&dfitem->list, &deferred);
+	spin_unlock_bh(&deferred_lock);
+	schedule_work(&deferred_process_work);
+	return 0;
+}
+
+static int switchdev_port_attr_notify(enum switchdev_notifier_type nt,
+				      struct net_device *dev,
+				      const struct switchdev_attr *attr,
+				      struct switchdev_trans *trans)
+{
+	int err;
+	int rc;
+
+	struct switchdev_notifier_port_attr_info attr_info = {
+		.attr = attr,
+		.trans = trans,
+		.handled = false,
+	};
+
+	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;
+	}
+
+	if (!attr_info.handled)
+		return -EOPNOTSUPP;
+
+	return 0;
+}
+
+static int switchdev_port_attr_set_now(struct net_device *dev,
+				       const struct switchdev_attr *attr)
+{
+	struct switchdev_trans trans;
+	int err;
+
+	/* Phase I: prepare for attr set. Driver/device should fail
+	 * here if there are going to be issues in the commit phase,
+	 * such as lack of resources or support.  The driver/device
+	 * should reserve resources needed for the commit phase here,
+	 * but should not commit the attr.
+	 */
+
+	trans.ph_prepare = true;
+	err = switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
+					 &trans);
+	if (err)
+		return err;
+
+	/* Phase II: commit attr set.  This cannot fail as a fault
+	 * of driver/device.  If it does, it's a bug in the driver/device
+	 * because the driver said everythings was OK in phase I.
+	 */
+
+	trans.ph_prepare = false;
+	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);
+
+	return err;
+}
+
+static void switchdev_port_attr_set_deferred(struct net_device *dev,
+					     const void *data)
+{
+	const struct switchdev_attr *attr = data;
+	int err;
+
+	err = switchdev_port_attr_set_now(dev, attr);
+	if (err && err != -EOPNOTSUPP)
+		netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
+			   err, attr->id);
+	if (attr->complete)
+		attr->complete(dev, err, attr->complete_priv);
+}
+
+static int switchdev_port_attr_set_defer(struct net_device *dev,
+					 const struct switchdev_attr *attr)
+{
+	return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
+					  switchdev_port_attr_set_deferred);
+}
+
+/**
+ *	switchdev_port_attr_set - Set port attribute
+ *
+ *	@dev: port device
+ *	@attr: attribute to set
+ *
+ *	Use a 2-phase prepare-commit transaction model to ensure
+ *	system is not left in a partially updated state due to
+ *	failure from driver/device.
+ *
+ *	rtnl_lock must be held and must not be in atomic section,
+ *	in case SWITCHDEV_F_DEFER flag is not set.
+ */
+int switchdev_port_attr_set(struct net_device *dev,
+			    const struct switchdev_attr *attr)
+{
+	if (attr->flags & SWITCHDEV_F_DEFER)
+		return switchdev_port_attr_set_defer(dev, attr);
+	ASSERT_RTNL();
+	return switchdev_port_attr_set_now(dev, attr);
+}
+EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
+
+static size_t switchdev_obj_size(const struct switchdev_obj *obj)
+{
+	switch (obj->id) {
+	case SWITCHDEV_OBJ_ID_PORT_VLAN:
+		return sizeof(struct switchdev_obj_port_vlan);
+	case SWITCHDEV_OBJ_ID_PORT_MDB:
+		return sizeof(struct switchdev_obj_port_mdb);
+	case SWITCHDEV_OBJ_ID_HOST_MDB:
+		return sizeof(struct switchdev_obj_port_mdb);
+	default:
+		BUG();
+	}
+	return 0;
+}
+
+static int switchdev_port_obj_notify(enum switchdev_notifier_type nt,
+				     struct net_device *dev,
+				     const struct switchdev_obj *obj,
+				     struct switchdev_trans *trans,
+				     struct netlink_ext_ack *extack)
+{
+	int rc;
+	int err;
+
+	struct switchdev_notifier_port_obj_info obj_info = {
+		.obj = obj,
+		.trans = trans,
+		.handled = false,
+	};
+
+	rc = call_switchdev_blocking_notifiers(nt, dev, &obj_info.info, extack);
+	err = notifier_to_errno(rc);
+	if (err) {
+		WARN_ON(!obj_info.handled);
+		return err;
+	}
+	if (!obj_info.handled)
+		return -EOPNOTSUPP;
+	return 0;
+}
+
+static int switchdev_port_obj_add_now(struct net_device *dev,
+				      const struct switchdev_obj *obj,
+				      struct netlink_ext_ack *extack)
+{
+	struct switchdev_trans trans;
+	int err;
+
+	ASSERT_RTNL();
+
+	/* Phase I: prepare for obj add. Driver/device should fail
+	 * here if there are going to be issues in the commit phase,
+	 * such as lack of resources or support.  The driver/device
+	 * should reserve resources needed for the commit phase here,
+	 * but should not commit the obj.
+	 */
+
+	trans.ph_prepare = true;
+	err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
+					dev, obj, &trans, extack);
+	if (err)
+		return err;
+
+	/* Phase II: commit obj add.  This cannot fail as a fault
+	 * of driver/device.  If it does, it's a bug in the driver/device
+	 * because the driver said everythings was OK in phase I.
+	 */
+
+	trans.ph_prepare = false;
+	err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
+					dev, obj, &trans, extack);
+	WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
+
+	return err;
+}
+
+static void switchdev_port_obj_add_deferred(struct net_device *dev,
+					    const void *data)
+{
+	const struct switchdev_obj *obj = data;
+	int err;
+
+	err = switchdev_port_obj_add_now(dev, obj, NULL);
+	if (err && err != -EOPNOTSUPP)
+		netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
+			   err, obj->id);
+	if (obj->complete)
+		obj->complete(dev, err, obj->complete_priv);
+}
+
+static int switchdev_port_obj_add_defer(struct net_device *dev,
+					const struct switchdev_obj *obj)
+{
+	return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
+					  switchdev_port_obj_add_deferred);
+}
+
+/**
+ *	switchdev_port_obj_add - Add port object
+ *
+ *	@dev: port device
+ *	@obj: object to add
+ *	@extack: netlink extended ack
+ *
+ *	Use a 2-phase prepare-commit transaction model to ensure
+ *	system is not left in a partially updated state due to
+ *	failure from driver/device.
+ *
+ *	rtnl_lock must be held and must not be in atomic section,
+ *	in case SWITCHDEV_F_DEFER flag is not set.
+ */
+int switchdev_port_obj_add(struct net_device *dev,
+			   const struct switchdev_obj *obj,
+			   struct netlink_ext_ack *extack)
+{
+	if (obj->flags & SWITCHDEV_F_DEFER)
+		return switchdev_port_obj_add_defer(dev, obj);
+	ASSERT_RTNL();
+	return switchdev_port_obj_add_now(dev, obj, extack);
+}
+EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
+
+static int switchdev_port_obj_del_now(struct net_device *dev,
+				      const struct switchdev_obj *obj)
+{
+	return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_DEL,
+					 dev, obj, NULL, NULL);
+}
+
+static void switchdev_port_obj_del_deferred(struct net_device *dev,
+					    const void *data)
+{
+	const struct switchdev_obj *obj = data;
+	int err;
+
+	err = switchdev_port_obj_del_now(dev, obj);
+	if (err && err != -EOPNOTSUPP)
+		netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
+			   err, obj->id);
+	if (obj->complete)
+		obj->complete(dev, err, obj->complete_priv);
+}
+
+static int switchdev_port_obj_del_defer(struct net_device *dev,
+					const struct switchdev_obj *obj)
+{
+	return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
+					  switchdev_port_obj_del_deferred);
+}
+
+/**
+ *	switchdev_port_obj_del - Delete port object
+ *
+ *	@dev: port device
+ *	@obj: object to delete
+ *
+ *	rtnl_lock must be held and must not be in atomic section,
+ *	in case SWITCHDEV_F_DEFER flag is not set.
+ */
+int switchdev_port_obj_del(struct net_device *dev,
+			   const struct switchdev_obj *obj)
+{
+	if (obj->flags & SWITCHDEV_F_DEFER)
+		return switchdev_port_obj_del_defer(dev, obj);
+	ASSERT_RTNL();
+	return switchdev_port_obj_del_now(dev, obj);
+}
+EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
+
+static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
+static BLOCKING_NOTIFIER_HEAD(switchdev_blocking_notif_chain);
+
+/**
+ *	register_switchdev_notifier - Register notifier
+ *	@nb: notifier_block
+ *
+ *	Register switch device notifier.
+ */
+int register_switchdev_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
+}
+EXPORT_SYMBOL_GPL(register_switchdev_notifier);
+
+/**
+ *	unregister_switchdev_notifier - Unregister notifier
+ *	@nb: notifier_block
+ *
+ *	Unregister switch device notifier.
+ */
+int unregister_switchdev_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
+
+/**
+ *	call_switchdev_notifiers - Call notifiers
+ *	@val: value passed unmodified to notifier function
+ *	@dev: port device
+ *	@info: notifier information data
+ *	@extack: netlink extended ack
+ *	Call all network notifier blocks.
+ */
+int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
+			     struct switchdev_notifier_info *info,
+			     struct netlink_ext_ack *extack)
+{
+	info->dev = dev;
+	info->extack = extack;
+	return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
+}
+EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
+
+int register_switchdev_blocking_notifier(struct notifier_block *nb)
+{
+	struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
+
+	return blocking_notifier_chain_register(chain, nb);
+}
+EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier);
+
+int unregister_switchdev_blocking_notifier(struct notifier_block *nb)
+{
+	struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
+
+	return blocking_notifier_chain_unregister(chain, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier);
+
+int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
+				      struct switchdev_notifier_info *info,
+				      struct netlink_ext_ack *extack)
+{
+	info->dev = dev;
+	info->extack = extack;
+	return blocking_notifier_call_chain(&switchdev_blocking_notif_chain,
+					    val, info);
+}
+EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers);
+
+static int __switchdev_handle_port_obj_add(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*add_cb)(struct net_device *dev,
+				      const struct switchdev_obj *obj,
+				      struct switchdev_trans *trans,
+				      struct netlink_ext_ack *extack))
+{
+	struct netlink_ext_ack *extack;
+	struct net_device *lower_dev;
+	struct list_head *iter;
+	int err = -EOPNOTSUPP;
+
+	extack = switchdev_notifier_info_to_extack(&port_obj_info->info);
+
+	if (check_cb(dev)) {
+		err = add_cb(dev, port_obj_info->obj, port_obj_info->trans,
+			     extack);
+		if (err != -EOPNOTSUPP)
+			port_obj_info->handled = true;
+		return err;
+	}
+
+	/* 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) {
+		if (netif_is_bridge_master(lower_dev))
+			continue;
+
+		err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
+						      check_cb, add_cb);
+		if (err && err != -EOPNOTSUPP)
+			return err;
+	}
+
+	return err;
+}
+
+int switchdev_handle_port_obj_add(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*add_cb)(struct net_device *dev,
+				      const struct switchdev_obj *obj,
+				      struct switchdev_trans *trans,
+				      struct netlink_ext_ack *extack))
+{
+	int err;
+
+	err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
+					      add_cb);
+	if (err == -EOPNOTSUPP)
+		err = 0;
+	return err;
+}
+EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add);
+
+static int __switchdev_handle_port_obj_del(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*del_cb)(struct net_device *dev,
+				      const struct switchdev_obj *obj))
+{
+	struct net_device *lower_dev;
+	struct list_head *iter;
+	int err = -EOPNOTSUPP;
+
+	if (check_cb(dev)) {
+		err = del_cb(dev, port_obj_info->obj);
+		if (err != -EOPNOTSUPP)
+			port_obj_info->handled = true;
+		return err;
+	}
+
+	/* 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) {
+		if (netif_is_bridge_master(lower_dev))
+			continue;
+
+		err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
+						      check_cb, del_cb);
+		if (err && err != -EOPNOTSUPP)
+			return err;
+	}
+
+	return err;
+}
+
+int switchdev_handle_port_obj_del(struct net_device *dev,
+			struct switchdev_notifier_port_obj_info *port_obj_info,
+			bool (*check_cb)(const struct net_device *dev),
+			int (*del_cb)(struct net_device *dev,
+				      const struct switchdev_obj *obj))
+{
+	int err;
+
+	err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
+					      del_cb);
+	if (err == -EOPNOTSUPP)
+		err = 0;
+	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)) {
+		err = set_cb(dev, port_attr_info->attr, port_attr_info->trans);
+		if (err != -EOPNOTSUPP)
+			port_attr_info->handled = true;
+		return err;
+	}
+
+	/* 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) {
+		if (netif_is_bridge_master(lower_dev))
+			continue;
+
+		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);