path: root/net/switchdev/switchdev.c

/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#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/if_bridge.h>
#include <linux/list.h>
#include <net/ip_fib.h>
#include <net/switchdev.h>

/**
 *	switchdev_trans_item_enqueue - Enqueue data item to transaction queue
 *
 *	@trans: transaction
 *	@data: pointer to data being queued
 *	@destructor: data destructor
 *	@tritem: transaction item being queued
 *
 *	Enqeueue data item to transaction queue. tritem is typically placed in
 *	cointainter pointed at by data pointer. Destructor is called on
 *	transaction abort and after successful commit phase in case
 *	the caller did not dequeue the item before.
 */
void switchdev_trans_item_enqueue(struct switchdev_trans *trans,
				  void *data, void (*destructor)(void const *),
				  struct switchdev_trans_item *tritem)
{
	tritem->data = data;
	tritem->destructor = destructor;
	list_add_tail(&tritem->list, &trans->item_list);
}
EXPORT_SYMBOL_GPL(switchdev_trans_item_enqueue);

static struct switchdev_trans_item *
__switchdev_trans_item_dequeue(struct switchdev_trans *trans)
{
	struct switchdev_trans_item *tritem;

	if (list_empty(&trans->item_list))
		return NULL;
	tritem = list_first_entry(&trans->item_list,
				  struct switchdev_trans_item, list);
	list_del(&tritem->list);
	return tritem;
}

/**
 *	switchdev_trans_item_dequeue - Dequeue data item from transaction queue
 *
 *	@trans: transaction
 */
void *switchdev_trans_item_dequeue(struct switchdev_trans *trans)
{
	struct switchdev_trans_item *tritem;

	tritem = __switchdev_trans_item_dequeue(trans);
	BUG_ON(!tritem);
	return tritem->data;
}
EXPORT_SYMBOL_GPL(switchdev_trans_item_dequeue);

static void switchdev_trans_init(struct switchdev_trans *trans)
{
	INIT_LIST_HEAD(&trans->item_list);
}

static void switchdev_trans_items_destroy(struct switchdev_trans *trans)
{
	struct switchdev_trans_item *tritem;

	while ((tritem = __switchdev_trans_item_dequeue(trans)))
		tritem->destructor(tritem->data);
}

static void switchdev_trans_items_warn_destroy(struct net_device *dev,
					       struct switchdev_trans *trans)
{
	WARN(!list_empty(&trans->item_list), "%s: transaction item queue is not empty.\n",
	     dev->name);
	switchdev_trans_items_destroy(trans);
}

/**
 *	switchdev_port_attr_get - Get port attribute
 *
 *	@dev: port device
 *	@attr: attribute to get
 */
int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
{
	const struct switchdev_ops *ops = dev->switchdev_ops;
	struct net_device *lower_dev;
	struct list_head *iter;
	struct switchdev_attr first = {
		.id = SWITCHDEV_ATTR_UNDEFINED
	};
	int err = -EOPNOTSUPP;

	if (ops && ops->switchdev_port_attr_get)
		return ops->switchdev_port_attr_get(dev, attr);

	if (attr->flags & SWITCHDEV_F_NO_RECURSE)
		return err;

	/* Switch device port(s) may be stacked under
	 * bond/team/vlan dev, so recurse down to get attr on
	 * each port.  Return -ENODATA if attr values don't
	 * compare across ports.
	 */

	netdev_for_each_lower_dev(dev, lower_dev, iter) {
		err = switchdev_port_attr_get(lower_dev, attr);
		if (err)
			break;
		if (first.id == SWITCHDEV_ATTR_UNDEFINED)
			first = *attr;
		else if (memcmp(&first, attr, sizeof(*attr)))
			return -ENODATA;
	}

	return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_attr_get);

static int __switchdev_port_attr_set(struct net_device *dev,
				     struct switchdev_attr *attr,
				     struct sw