net/dsa/dsa.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * net/dsa/dsa.c - Hardware switch handling
  * Copyright (c) 2008-2009 Marvell Semiconductor
  * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
  */

 #include <linux/device.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/sysfs.h>
 #include <linux/ptp_classify.h>

 #include "dsa_priv.h"

 static LIST_HEAD(dsa_tag_drivers_list);
 static DEFINE_MUTEX(dsa_tag_drivers_lock);

 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 					    struct net_device *dev)
 {
 	/* Just return the original SKB */
 	return skb;
 }

 static const struct dsa_device_ops none_ops = {
 	.name	= "none",
 	.proto	= DSA_TAG_PROTO_NONE,
 	.xmit	= dsa_slave_notag_xmit,
 	.rcv	= NULL,
 };

 DSA_TAG_DRIVER(none_ops);

 static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
 				    struct module *owner)
 {
 	dsa_tag_driver->owner = owner;

 	mutex_lock(&dsa_tag_drivers_lock);
 	list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
 	mutex_unlock(&dsa_tag_drivers_lock);
 }

 void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
 			      unsigned int count, struct module *owner)
 {
 	unsigned int i;

 	for (i = 0; i < count; i++)
 		dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
 }

 static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
 {
 	mutex_lock(&dsa_tag_drivers_lock);
 	list_del(&dsa_tag_driver->list);
 	mutex_unlock(&dsa_tag_drivers_lock);
 }
 EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);

 void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
 				unsigned int count)
 {
 	unsigned int i;

 	for (i = 0; i < count; i++)
 		dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
 }
 EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);

 const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
 {
 	return ops->name;
 };

 /* Function takes a reference on the module owning the tagger,
  * so dsa_tag_driver_put must be called afterwards.
  */
 const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf)
 {
 	const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT);
 	struct dsa_tag_driver *dsa_tag_driver;

 	mutex_lock(&dsa_tag_drivers_lock);
 	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
 		const struct dsa_device_ops *tmp = dsa_tag_driver->ops;

 		if (!sysfs_streq(buf, tmp->name))
 			continue;

 		if (!try_module_get(dsa_tag_driver->owner))
 			break;

 		ops = tmp;
 		break;
 	}
 	mutex_unlock(&dsa_tag_drivers_lock);

 	return ops;
 }

 const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
 {
 	struct dsa_tag_driver *dsa_tag_driver;
 	const struct dsa_device_ops *ops;
 	bool found = false;

 	request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol);

 	mutex_lock(&dsa_tag_drivers_lock);
 	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
 		ops = dsa_tag_driver->ops;
 		if (ops->proto == tag_protocol) {
 			found = true;
 			break;
 		}
 	}

 	if (found) {
 		if (!try_module_get(dsa_tag_driver->owner))
 			ops = ERR_PTR(-ENOPROTOOPT);
 	} else {
 		ops = ERR_PTR(-ENOPROTOOPT);
 	}

 	mutex_unlock(&dsa_tag_drivers_lock);

 	return ops;
 }

 void dsa_tag_driver_put(const struct dsa_device_ops *ops)
 {
 	struct dsa_tag_driver *dsa_tag_driver;

 	mutex_lock(&dsa_tag_drivers_lock);
 	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
 		if (dsa_tag_driver->ops == ops) {
 			module_put(dsa_tag_driver->owner);
 			break;
 		}
 	}
 	mutex_unlock(&dsa_tag_drivers_lock);
 }

 static int dev_is_class(struct device *dev, void *class)
 {
 	if (dev->class != NULL && !strcmp(dev->class->name, class))
 		return 1;

 	return 0;
 }

 static struct device *dev_find_class(struct device *parent, char *class)
 {
 	if (dev_is_class(parent, class)) {
 		get_device(parent);
 		return parent;
 	}

 	return device_find_child(parent, class, dev_is_class);
 }

 struct net_device *dsa_dev_to_net_device(struct device *dev)
 {
 	struct device *d;

 	d = dev_find_class(dev, "net");
 	if (d != NULL) {
 		struct net_device *nd;

 		nd = to_net_dev(d);
 		dev_hold(nd);
 		put_device(d);

 		return nd;
 	}

 	return NULL;
 }
 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);

 /* Determine if we should defer delivery of skb until we have a rx timestamp.
  *
  * Called from dsa_switch_rcv. For now, this will only work if tagging is
  * enabled on the switch. Normally the MAC driver would retrieve the hardware
  * timestamp when it reads the packet out of the hardware. However in a DSA
  * switch, the DSA driver owning the interface to which the packet is
  * delivered is never notified unless we do so here.
  */
 static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
 				       struct sk_buff *skb)
 {
 	struct dsa_switch *ds = p->dp->ds;
 	unsigned int type;

 	if (skb_headroom(skb) < ETH_HLEN)
 		return false;

 	__skb_push(skb, ETH_HLEN);

 	type = ptp_classify_raw(skb);

 	__skb_pull(skb, ETH_HLEN);

 	if (type == PTP_CLASS_NONE)
 		return false;

 	if (likely(ds->ops->port_rxtstamp))
 		return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);

 	return false;
 }

 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 			  struct packet_type *pt, struct net_device *unused)
 {
 	struct dsa_port *cpu_dp = dev->dsa_ptr;
 	struct sk_buff *nskb = NULL;
 	struct dsa_slave_priv *p;

 	if (unlikely(!cpu_dp)) {
 		kfree_skb(skb);
 		return 0;
 	}

 	skb = skb_unshare(skb, GFP_ATOMIC);
 	if (!skb)
 		return 0;

 	nskb = cpu_dp->rcv(skb, dev);
 	if (!nskb) {
 		kfree_skb(skb);
 		return 0;
 	}

 	skb = nskb;
 	skb_push(skb, ETH_HLEN);
 	skb->pkt_type = PACKET_HOST;
 	skb->protocol = eth_type_trans(skb, skb->dev);

 	if (unlikely(!dsa_slave_dev_check(skb->dev))) {
 		/* Packet is to be injected directly on an upper
 		 * device, e.g. a team/bond, so skip all DSA-port
 		 * specific actions.
 		 */
 		netif_rx(skb);
 		return 0;
 	}

 	p = netdev_priv(skb->dev);

 	if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
 		nskb = dsa_untag_bridge_pvid(skb);
 		if (!nskb) {
 			kfree_skb(skb);
 			return 0;
 		}
 		skb = nskb;
 	}

 	dev_sw_netstats_rx_add(skb->dev, skb->len);

 	if (dsa_skb_defer_rx_timestamp(p, skb))
 		return 0;

 	gro_cells_receive(&p->gcells, skb);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static bool dsa_port_is_initialized(const struct dsa_port *dp)
 {
 	return dp->type == DSA_PORT_TYPE_USER && dp->slave;
 }

 int dsa_switch_suspend(struct dsa_switch *ds)
 {
 	struct dsa_port *dp;
 	int ret = 0;

 	/* Suspend slave network devices */
 	dsa_switch_for_each_port(dp, ds) {
 		if (!dsa_port_is_initialized(dp))
 			continue;

 		ret = dsa_slave_suspend(dp->slave);
 		if (ret)
 			return ret;
 	}

 	if (ds->ops->suspend)
 		ret = ds->ops->suspend(ds);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(dsa_switch_suspend);

 int dsa_switch_resume(struct dsa_switch *ds)
 {
 	struct dsa_port *dp;
 	int ret = 0;

 	if (ds->ops->resume)
 		ret = ds->ops->resume(ds);

 	if (ret)
 		return ret;

 	/* Resume slave network devices */
 	dsa_switch_for_each_port(dp, ds) {
 		if (!dsa_port_is_initialized(dp))
 			continue;

 		ret = dsa_slave_resume(dp->slave);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 #endif

 static struct packet_type dsa_pack_type __read_mostly = {
 	.type	= cpu_to_be16(ETH_P_XDSA),
 	.func	= dsa_switch_rcv,
 };

 static struct workqueue_struct *dsa_owq;

 bool dsa_schedule_work(struct work_struct *work)
 {
 	return queue_work(dsa_owq, work);
 }

 void dsa_flush_workqueue(void)
 {
 	flush_workqueue(dsa_owq);
 }
 EXPORT_SYMBOL_GPL(dsa_flush_workqueue);

 int dsa_devlink_param_get(struct devlink *dl, u32 id,
 			  struct devlink_param_gset_ctx *ctx)
 {
 	struct dsa_switch *ds = dsa_devlink_to_ds(dl);

 	if (!ds->ops->devlink_param_get)
 		return -EOPNOTSUPP;

 	return ds->ops->devlink_param_get(ds, id, ctx);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_param_get);

 int dsa_devlink_param_set(struct devlink *dl, u32 id,
 			  struct devlink_param_gset_ctx *ctx)
 {
 	struct dsa_switch *ds = dsa_devlink_to_ds(dl);

 	if (!ds->ops->devlink_param_set)
 		return -EOPNOTSUPP;

 	return ds->ops->devlink_param_set(ds, id, ctx);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_param_set);

 int dsa_devlink_params_register(struct dsa_switch *ds,
 				const struct devlink_param *params,
 				size_t params_count)
 {
 	return devlink_params_register(ds->devlink, params, params_count);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_params_register);

 void dsa_devlink_params_unregister(struct dsa_switch *ds,
 				   const struct devlink_param *params,
 				   size_t params_count)
 {
 	devlink_params_unregister(ds->devlink, params, params_count);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister);

 int dsa_devlink_resource_register(struct dsa_switch *ds,
 				  const char *resource_name,
 				  u64 resource_size,
 				  u64 resource_id,
 				  u64 parent_resource_id,
 				  const struct devlink_resource_size_params *size_params)
 {
 	return devlink_resource_register(ds->devlink, resource_name,
 					 resource_size, resource_id,
 					 parent_resource_id,
 					 size_params);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_resource_register);

 void dsa_devlink_resources_unregister(struct dsa_switch *ds)
 {
 	devlink_resources_unregister(ds->devlink);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister);

 void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
 					   u64 resource_id,
 					   devlink_resource_occ_get_t *occ_get,
 					   void *occ_get_priv)
 {
 	return devlink_resource_occ_get_register(ds->devlink, resource_id,
 						 occ_get, occ_get_priv);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register);

 void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
 					     u64 resource_id)
 {
 	devlink_resource_occ_get_unregister(ds->devlink, resource_id);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister);

 struct devlink_region *
 dsa_devlink_region_create(struct dsa_switch *ds,
 			  const struct devlink_region_ops *ops,
 			  u32 region_max_snapshots, u64 region_size)
 {
 	return devlink_region_create(ds->devlink, ops, region_max_snapshots,
 				     region_size);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_region_create);

 struct devlink_region *
 dsa_devlink_port_region_create(struct dsa_switch *ds,
 			       int port,
 			       const struct devlink_port_region_ops *ops,
 			       u32 region_max_snapshots, u64 region_size)
 {
 	struct dsa_port *dp = dsa_to_port(ds, port);

 	return devlink_port_region_create(&dp->devlink_port, ops,
 					  region_max_snapshots,
 					  region_size);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create);

 void dsa_devlink_region_destroy(struct devlink_region *region)
 {
 	devlink_region_destroy(region);
 }
 EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy);

 struct dsa_port *dsa_port_from_netdev(struct net_device *netdev)
 {
 	if (!netdev || !dsa_slave_dev_check(netdev))
 		return ERR_PTR(-ENODEV);

 	return dsa_slave_to_port(netdev);
 }
 EXPORT_SYMBOL_GPL(dsa_port_from_netdev);

 bool dsa_db_equal(const struct dsa_db *a, const struct dsa_db *b)
 {
 	if (a->type != b->type)
 		return false;

 	switch (a->type) {
 	case DSA_DB_PORT:
 		return a->dp == b->dp;
 	case DSA_DB_LAG:
 		return a->lag.dev == b->lag.dev;
 	case DSA_DB_BRIDGE:
 		return a->bridge.num == b->bridge.num;
 	default:
 		WARN_ON(1);
 		return false;
 	}
 }

 bool dsa_fdb_present_in_other_db(struct dsa_switch *ds, int port,
 				 const unsigned char *addr, u16 vid,
 				 struct dsa_db db)
 {
 	struct dsa_port *dp = dsa_to_port(ds, port);
 	struct dsa_mac_addr *a;

 	lockdep_assert_held(&dp->addr_lists_lock);

 	list_for_each_entry(a, &dp->fdbs, list) {
 		if (!ether_addr_equal(a->addr, addr) || a->vid != vid)
 			continue;

 		if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
 			return true;
 	}

 	return false;
 }
 EXPORT_SYMBOL_GPL(dsa_fdb_present_in_other_db);

 bool dsa_mdb_present_in_other_db(struct dsa_switch *ds, int port,
 				 const struct switchdev_obj_port_mdb *mdb,
 				 struct dsa_db db)
 {
 	struct dsa_port *dp = dsa_to_port(ds, port);
 	struct dsa_mac_addr *a;

 	lockdep_assert_held(&dp->addr_lists_lock);

 	list_for_each_entry(a, &dp->mdbs, list) {
 		if (!ether_addr_equal(a->addr, mdb->addr) || a->vid != mdb->vid)
 			continue;

 		if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
 			return true;
 	}

 	return false;
 }
 EXPORT_SYMBOL_GPL(dsa_mdb_present_in_other_db);

 static int __init dsa_init_module(void)
 {
 	int rc;

 	dsa_owq = alloc_ordered_workqueue("dsa_ordered",
 					  WQ_MEM_RECLAIM);
 	if (!dsa_owq)
 		return -ENOMEM;

 	rc = dsa_slave_register_notifier();
 	if (rc)
 		goto register_notifier_fail;

 	dev_add_pack(&dsa_pack_type);

 	dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
 				THIS_MODULE);

 	return 0;

 register_notifier_fail:
 	destroy_workqueue(dsa_owq);

 	return rc;
 }
 module_init(dsa_init_module);

 static void __exit dsa_cleanup_module(void)
 {
 	dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));

 	dsa_slave_unregister_notifier();
 	dev_remove_pack(&dsa_pack_type);
 	destroy_workqueue(dsa_owq);
 }
 module_exit(dsa_cleanup_module);

 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:dsa");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* net/dsa/dsa.c - Hardware switch handling
	* Copyright (c) 2008-2009 Marvell Semiconductor
	* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
	*/

	#include <linux/device.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/sysfs.h>
	#include <linux/ptp_classify.h>

	#include "dsa_priv.h"

	static LIST_HEAD(dsa_tag_drivers_list);
	static DEFINE_MUTEX(dsa_tag_drivers_lock);

	static struct sk_buff dsa_slave_notag_xmit(struct sk_buff skb,
	struct net_device *dev)
	{
	/* Just return the original SKB */
	return skb;
	}

	static const struct dsa_device_ops none_ops = {
	.name = "none",
	.proto = DSA_TAG_PROTO_NONE,
	.xmit = dsa_slave_notag_xmit,
	.rcv = NULL,
	};

	DSA_TAG_DRIVER(none_ops);

	static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
	struct module *owner)
	{
	dsa_tag_driver->owner = owner;

	mutex_lock(&dsa_tag_drivers_lock);
	list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
	mutex_unlock(&dsa_tag_drivers_lock);
	}

	void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
	unsigned int count, struct module *owner)
	{
	unsigned int i;

	for (i = 0; i < count; i++)
	dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
	}

	static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
	{
	mutex_lock(&dsa_tag_drivers_lock);
	list_del(&dsa_tag_driver->list);
	mutex_unlock(&dsa_tag_drivers_lock);
	}
	EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);

	void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
	unsigned int count)
	{
	unsigned int i;

	for (i = 0; i < count; i++)
	dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
	}
	EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);

	const char dsa_tag_protocol_to_str(const struct dsa_device_ops ops)
	{
	return ops->name;
	};

	/* Function takes a reference on the module owning the tagger,
	* so dsa_tag_driver_put must be called afterwards.
	*/
	const struct dsa_device_ops dsa_find_tagger_by_name(const char buf)
	{
	const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT);
	struct dsa_tag_driver *dsa_tag_driver;

	mutex_lock(&dsa_tag_drivers_lock);
	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
	const struct dsa_device_ops *tmp = dsa_tag_driver->ops;

	if (!sysfs_streq(buf, tmp->name))
	continue;

	if (!try_module_get(dsa_tag_driver->owner))
	break;

	ops = tmp;
	break;
	}
	mutex_unlock(&dsa_tag_drivers_lock);

	return ops;
	}

	const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
	{
	struct dsa_tag_driver *dsa_tag_driver;
	const struct dsa_device_ops *ops;
	bool found = false;

	request_module("%s%d", DSA_TAG_DRIVER_ALIAS, tag_protocol);

	mutex_lock(&dsa_tag_drivers_lock);
	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
	ops = dsa_tag_driver->ops;
	if (ops->proto == tag_protocol) {
	found = true;
	break;
	}
	}

	if (found) {
	if (!try_module_get(dsa_tag_driver->owner))
	ops = ERR_PTR(-ENOPROTOOPT);
	} else {
	ops = ERR_PTR(-ENOPROTOOPT);
	}

	mutex_unlock(&dsa_tag_drivers_lock);

	return ops;
	}

	void dsa_tag_driver_put(const struct dsa_device_ops *ops)
	{
	struct dsa_tag_driver *dsa_tag_driver;

	mutex_lock(&dsa_tag_drivers_lock);
	list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
	if (dsa_tag_driver->ops == ops) {
	module_put(dsa_tag_driver->owner);
	break;
	}
	}
	mutex_unlock(&dsa_tag_drivers_lock);
	}

	static int dev_is_class(struct device dev, void class)
	{
	if (dev->class != NULL && !strcmp(dev->class->name, class))
	return 1;

	return 0;
	}

	static struct device dev_find_class(struct device parent, char *class)
	{
	if (dev_is_class(parent, class)) {
	get_device(parent);
	return parent;
	}

	return device_find_child(parent, class, dev_is_class);
	}

	struct net_device dsa_dev_to_net_device(struct device dev)
	{
	struct device *d;

	d = dev_find_class(dev, "net");
	if (d != NULL) {
	struct net_device *nd;

	nd = to_net_dev(d);
	dev_hold(nd);
	put_device(d);

	return nd;
	}

	return NULL;
	}
	EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);

	/* Determine if we should defer delivery of skb until we have a rx timestamp.
	*
	* Called from dsa_switch_rcv. For now, this will only work if tagging is
	* enabled on the switch. Normally the MAC driver would retrieve the hardware
	* timestamp when it reads the packet out of the hardware. However in a DSA
	* switch, the DSA driver owning the interface to which the packet is
	* delivered is never notified unless we do so here.
	*/
	static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
	struct sk_buff *skb)
	{
	struct dsa_switch *ds = p->dp->ds;
	unsigned int type;

	if (skb_headroom(skb) < ETH_HLEN)
	return false;

	__skb_push(skb, ETH_HLEN);

	type = ptp_classify_raw(skb);

	__skb_pull(skb, ETH_HLEN);

	if (type == PTP_CLASS_NONE)
	return false;

	if (likely(ds->ops->port_rxtstamp))
	return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);

	return false;
	}

	static int dsa_switch_rcv(struct sk_buff skb, struct net_device dev,
	struct packet_type pt, struct net_device unused)
	{
	struct dsa_port *cpu_dp = dev->dsa_ptr;
	struct sk_buff *nskb = NULL;
	struct dsa_slave_priv *p;

	if (unlikely(!cpu_dp)) {
	kfree_skb(skb);
	return 0;
	}

	skb = skb_unshare(skb, GFP_ATOMIC);
	if (!skb)
	return 0;

	nskb = cpu_dp->rcv(skb, dev);
	if (!nskb) {
	kfree_skb(skb);
	return 0;
	}

	skb = nskb;
	skb_push(skb, ETH_HLEN);
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, skb->dev);

	if (unlikely(!dsa_slave_dev_check(skb->dev))) {
	/* Packet is to be injected directly on an upper
	* device, e.g. a team/bond, so skip all DSA-port
	* specific actions.
	*/
	netif_rx(skb);
	return 0;
	}

	p = netdev_priv(skb->dev);

	if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
	nskb = dsa_untag_bridge_pvid(skb);
	if (!nskb) {
	kfree_skb(skb);
	return 0;
	}
	skb = nskb;
	}

	dev_sw_netstats_rx_add(skb->dev, skb->len);

	if (dsa_skb_defer_rx_timestamp(p, skb))
	return 0;

	gro_cells_receive(&p->gcells, skb);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static bool dsa_port_is_initialized(const struct dsa_port *dp)
	{
	return dp->type == DSA_PORT_TYPE_USER && dp->slave;
	}

	int dsa_switch_suspend(struct dsa_switch *ds)
	{
	struct dsa_port *dp;
	int ret = 0;

	/* Suspend slave network devices */
	dsa_switch_for_each_port(dp, ds) {
	if (!dsa_port_is_initialized(dp))
	continue;

	ret = dsa_slave_suspend(dp->slave);
	if (ret)
	return ret;
	}

	if (ds->ops->suspend)
	ret = ds->ops->suspend(ds);

	return ret;
	}
	EXPORT_SYMBOL_GPL(dsa_switch_suspend);

	int dsa_switch_resume(struct dsa_switch *ds)
	{
	struct dsa_port *dp;
	int ret = 0;

	if (ds->ops->resume)
	ret = ds->ops->resume(ds);

	if (ret)
	return ret;

	/* Resume slave network devices */
	dsa_switch_for_each_port(dp, ds) {
	if (!dsa_port_is_initialized(dp))
	continue;

	ret = dsa_slave_resume(dp->slave);
	if (ret)
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(dsa_switch_resume);
	#endif

	static struct packet_type dsa_pack_type __read_mostly = {
	.type = cpu_to_be16(ETH_P_XDSA),
	.func = dsa_switch_rcv,
	};

	static struct workqueue_struct *dsa_owq;

	bool dsa_schedule_work(struct work_struct *work)
	{
	return queue_work(dsa_owq, work);
	}

	void dsa_flush_workqueue(void)
	{
	flush_workqueue(dsa_owq);
	}
	EXPORT_SYMBOL_GPL(dsa_flush_workqueue);

	int dsa_devlink_param_get(struct devlink *dl, u32 id,
	struct devlink_param_gset_ctx *ctx)
	{
	struct dsa_switch *ds = dsa_devlink_to_ds(dl);

	if (!ds->ops->devlink_param_get)
	return -EOPNOTSUPP;

	return ds->ops->devlink_param_get(ds, id, ctx);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_param_get);

	int dsa_devlink_param_set(struct devlink *dl, u32 id,
	struct devlink_param_gset_ctx *ctx)
	{
	struct dsa_switch *ds = dsa_devlink_to_ds(dl);

	if (!ds->ops->devlink_param_set)
	return -EOPNOTSUPP;

	return ds->ops->devlink_param_set(ds, id, ctx);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_param_set);

	int dsa_devlink_params_register(struct dsa_switch *ds,
	const struct devlink_param *params,
	size_t params_count)
	{
	return devlink_params_register(ds->devlink, params, params_count);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_params_register);

	void dsa_devlink_params_unregister(struct dsa_switch *ds,
	const struct devlink_param *params,
	size_t params_count)
	{
	devlink_params_unregister(ds->devlink, params, params_count);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_params_unregister);

	int dsa_devlink_resource_register(struct dsa_switch *ds,
	const char *resource_name,
	u64 resource_size,
	u64 resource_id,
	u64 parent_resource_id,
	const struct devlink_resource_size_params *size_params)
	{
	return devlink_resource_register(ds->devlink, resource_name,
	resource_size, resource_id,
	parent_resource_id,
	size_params);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_resource_register);

	void dsa_devlink_resources_unregister(struct dsa_switch *ds)
	{
	devlink_resources_unregister(ds->devlink);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_resources_unregister);

	void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
	u64 resource_id,
	devlink_resource_occ_get_t *occ_get,
	void *occ_get_priv)
	{
	return devlink_resource_occ_get_register(ds->devlink, resource_id,
	occ_get, occ_get_priv);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_register);

	void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
	u64 resource_id)
	{
	devlink_resource_occ_get_unregister(ds->devlink, resource_id);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_resource_occ_get_unregister);

	struct devlink_region *
	dsa_devlink_region_create(struct dsa_switch *ds,
	const struct devlink_region_ops *ops,
	u32 region_max_snapshots, u64 region_size)
	{
	return devlink_region_create(ds->devlink, ops, region_max_snapshots,
	region_size);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_region_create);

	struct devlink_region *
	dsa_devlink_port_region_create(struct dsa_switch *ds,
	int port,
	const struct devlink_port_region_ops *ops,
	u32 region_max_snapshots, u64 region_size)
	{
	struct dsa_port *dp = dsa_to_port(ds, port);

	return devlink_port_region_create(&dp->devlink_port, ops,
	region_max_snapshots,
	region_size);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_port_region_create);

	void dsa_devlink_region_destroy(struct devlink_region *region)
	{
	devlink_region_destroy(region);
	}
	EXPORT_SYMBOL_GPL(dsa_devlink_region_destroy);

	struct dsa_port dsa_port_from_netdev(struct net_device netdev)
	{
	if (!netdev \|\| !dsa_slave_dev_check(netdev))
	return ERR_PTR(-ENODEV);

	return dsa_slave_to_port(netdev);
	}
	EXPORT_SYMBOL_GPL(dsa_port_from_netdev);

	bool dsa_db_equal(const struct dsa_db a, const struct dsa_db b)
	{
	if (a->type != b->type)
	return false;

	switch (a->type) {
	case DSA_DB_PORT:
	return a->dp == b->dp;
	case DSA_DB_LAG:
	return a->lag.dev == b->lag.dev;
	case DSA_DB_BRIDGE:
	return a->bridge.num == b->bridge.num;
	default:
	WARN_ON(1);
	return false;
	}
	}

	bool dsa_fdb_present_in_other_db(struct dsa_switch *ds, int port,
	const unsigned char *addr, u16 vid,
	struct dsa_db db)
	{
	struct dsa_port *dp = dsa_to_port(ds, port);
	struct dsa_mac_addr *a;

	lockdep_assert_held(&dp->addr_lists_lock);

	list_for_each_entry(a, &dp->fdbs, list) {
	if (!ether_addr_equal(a->addr, addr) \|\| a->vid != vid)
	continue;

	if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
	return true;
	}

	return false;
	}
	EXPORT_SYMBOL_GPL(dsa_fdb_present_in_other_db);

	bool dsa_mdb_present_in_other_db(struct dsa_switch *ds, int port,
	const struct switchdev_obj_port_mdb *mdb,
	struct dsa_db db)
	{
	struct dsa_port *dp = dsa_to_port(ds, port);
	struct dsa_mac_addr *a;

	lockdep_assert_held(&dp->addr_lists_lock);

	list_for_each_entry(a, &dp->mdbs, list) {
	if (!ether_addr_equal(a->addr, mdb->addr) \|\| a->vid != mdb->vid)
	continue;

	if (a->db.type == db.type && !dsa_db_equal(&a->db, &db))
	return true;
	}

	return false;
	}
	EXPORT_SYMBOL_GPL(dsa_mdb_present_in_other_db);

	static int __init dsa_init_module(void)
	{
	int rc;

	dsa_owq = alloc_ordered_workqueue("dsa_ordered",
	WQ_MEM_RECLAIM);
	if (!dsa_owq)
	return -ENOMEM;

	rc = dsa_slave_register_notifier();
	if (rc)
	goto register_notifier_fail;

	dev_add_pack(&dsa_pack_type);

	dsa_tag_driver_register(&DSA_TAG_DRIVER_NAME(none_ops),
	THIS_MODULE);

	return 0;

	register_notifier_fail:
	destroy_workqueue(dsa_owq);

	return rc;
	}
	module_init(dsa_init_module);

	static void __exit dsa_cleanup_module(void)
	{
	dsa_tag_driver_unregister(&DSA_TAG_DRIVER_NAME(none_ops));

	dsa_slave_unregister_notifier();
	dev_remove_pack(&dsa_pack_type);
	destroy_workqueue(dsa_owq);
	}
	module_exit(dsa_cleanup_module);

	MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
	MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:dsa");