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/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/module.h>
#include <linux/sched/signal.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include "ipoib.h"
static ssize_t show_parent(struct device *d, struct device_attribute *attr,
char *buf)
{
struct net_device *dev = to_net_dev(d);
struct ipoib_dev_priv *priv = ipoib_priv(dev);
return sprintf(buf, "%s\n", priv->parent->name);
}
static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
/*
* NOTE: If this function fails then the priv->dev will remain valid, however
* priv can have been freed and must not be touched by caller in the error
* case.
*
* If (ndev->reg_state == NETREG_UNINITIALIZED) then it is up to the caller to
* free the net_device (just as rtnl_newlink does) otherwise the net_device
* will be freed when the rtnl is unlocked.
*/
int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
u16 pkey, int type)
{
struct net_device *ndev = priv->dev;
int result;
ASSERT_RTNL();
/*
* Racing with unregister of the parent must be prevented by the
* caller.
*/
WARN_ON(ppriv->dev->reg_state != NETREG_REGISTERED);
priv->parent = ppriv->dev;
priv->pkey = pkey;
priv->child_type = type;
/* We do not need to touch priv if register_netdevice fails */
ndev->priv_destructor = ipoib_intf_free;
result = register_netdevice(ndev);
if (result) {
ipoib_warn(priv, "failed to initialize; error %i", result);
/*
* register_netdevice sometimes calls priv_destructor,
* sometimes not. Make sure it was done.
*/
if (ndev->priv_destructor)
ndev->priv_destructor(ndev);
return result;
}
/* RTNL childs don't need proprietary sysfs entries */
if (type == IPOIB_LEGACY_CHILD) {
if (ipoib_cm_add_mode_attr(ndev))
goto sysfs_failed;
if (ipoib_add_pkey_attr(ndev))
goto sysfs_failed;
if (ipoib_add_umcast_attr(ndev))
goto sysfs_failed;
if (device_create_file(&ndev->dev, &dev_attr_parent))
goto sysfs_failed;
}
return 0;
sysfs_failed:
unregister_netdevice(priv->dev);
return -ENOMEM;
}
int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
{
struct ipoib_dev_priv *ppriv, *priv;
char intf_name[IFNAMSIZ];
struct net_device *ndev;
struct ipoib_dev_priv *tpriv;
int result;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
ppriv = ipoib_priv(pdev);
snprintf(intf_name, sizeof(intf_name), "%s.%04x",
ppriv->dev->name, pkey);
if (!rtnl_trylock())
return restart_syscall();
if (pdev->reg_state != NETREG_REGISTERED) {
rtnl_unlock();
return -EPERM;
}
/*
* First ensure this isn't a duplicate. We check the parent device and
* then all of the legacy child interfaces to make sure the Pkey
* doesn't match.
*/
if (ppriv->pkey == pkey) {
result = -ENOTUNIQ;
goto out;
}
list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
if (tpriv->pkey == pkey &&
tpriv->child_type == IPOIB_LEGACY_CHILD) {
result = -ENOTUNIQ;
goto out;
}
}
priv = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
if (!priv) {
result = -ENOMEM;
goto out;
}
ndev = priv->dev;
result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
if (result && ndev->reg_state == NETREG_UNINITIALIZED)
free_netdev(ndev);
out:
rtnl_unlock();
return result;
}
struct ipoib_vlan_delete_work {
struct work_struct work;
struct net_device *dev;
};
/*
* sysfs callbacks of a netdevice cannot obtain the rtnl lock as
* unregister_netdev ultimately deletes the sysfs files while holding the rtnl
* lock. This deadlocks the system.
*
* A callback can use rtnl_trylock to avoid the deadlock but it cannot call
* unregister_netdev as that internally takes and releases the rtnl_lock. So
* instead we find the netdev to unregister and then do the actual unregister
* from the global work queue where we can obtain the rtnl_lock safely.
*/
static void ipoib_vlan_delete_task(struct work_struct *work)
{
struct ipoib_vlan_delete_work *pwork =
container_of(work, struct ipoib_vlan_delete_work, work);
struct net_device *dev = pwork->dev;
rtnl_lock();
/* Unregistering tasks can race with another task or parent removal */
if (dev->reg_state == NETREG_REGISTERED) {
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
ipoib_dbg(ppriv, "delete child vlan %s\n", dev->name);
unregister_netdevice(dev);
}
rtnl_unlock();
kfree(pwork);
}
int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
{
struct ipoib_dev_priv *ppriv, *priv, *tpriv;
int rc;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (!rtnl_trylock())
return restart_syscall();
if (pdev->reg_state != NETREG_REGISTERED) {
rtnl_unlock();
return -EPERM;
}
ppriv = ipoib_priv(pdev);
rc = -ENODEV;
list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
if (priv->pkey == pkey &&
priv->child_type == IPOIB_LEGACY_CHILD) {
struct ipoib_vlan_delete_work *work;
work = kmalloc(sizeof(*work), GFP_KERNEL);
if (!work) {
rc = -ENOMEM;
goto out;
}
down_write(&ppriv->vlan_rwsem);
list_del_init(&priv->list);
up_write(&ppriv->vlan_rwsem);
work->dev = priv->dev;
INIT_WORK(&work->work, ipoib_vlan_delete_task);
queue_work(ipoib_workqueue, &work->work);
rc = 0;
break;
}
}
out:
rtnl_unlock();
return rc;
}
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