/*
* net/switchdev/switchdev.c - Switch device API
* Copyright (c) 2014 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/if_vlan.h>
#include <net/ip_fib.h>
#include <net/switchdev.h>
/**
* 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)
{
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)
return ops->switchdev_port_attr_set(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 set attr on
* each port.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = __switchdev_port_attr_set(lower_dev, attr);
if (err)
break;
}
return err;
}
struct switchdev_attr_set_work {
struct work_struct work;
struct net_device *dev;
struct switchdev_attr attr;
};
static void switchdev_port_attr_set_work(struct work_struct *work)
{
struct switchdev_attr_set_work *asw =
container_of(work, struct switchdev_attr_set_work, work);
int err;
rtnl_lock();
err = switchdev_port_attr_set(asw->dev, &asw->attr);
if (err && err != -EOPNOTSUPP)
netdev_err(asw->dev, "failed (err=%d) to set attribute (id=%d)\n",
err, asw->attr.id);
rtnl_unlock();
dev_put(asw->dev);
kfree(work);
}
static int switchdev_port_attr_set_defer(struct net_device *dev,
struct switchdev_attr *attr)
{
struct switchdev_attr_set_work *asw;
asw = kmalloc(sizeof(*asw), GFP_ATOMIC);
if (!asw)
return -ENOMEM;
INIT_WORK(&asw