295 строки
7.4 KiB
C
295 строки
7.4 KiB
C
/*
|
|
* 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);
|
|
|
|
static bool is_child_unique(struct ipoib_dev_priv *ppriv,
|
|
struct ipoib_dev_priv *priv)
|
|
{
|
|
struct ipoib_dev_priv *tpriv;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/*
|
|
* Since the legacy sysfs interface uses pkey for deletion it cannot
|
|
* support more than one interface with the same pkey, it creates
|
|
* ambiguity. The RTNL interface deletes using the netdev so it does
|
|
* not have a problem to support duplicated pkeys.
|
|
*/
|
|
if (priv->child_type != IPOIB_LEGACY_CHILD)
|
|
return true;
|
|
|
|
/*
|
|
* 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 == priv->pkey)
|
|
return false;
|
|
|
|
list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
|
|
if (tpriv->pkey == priv->pkey &&
|
|
tpriv->child_type == IPOIB_LEGACY_CHILD)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* NOTE: If this function fails then the priv->dev will remain valid, however
|
|
* priv will 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;
|
|
struct rdma_netdev *rn = netdev_priv(ndev);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/*
|
|
* We do not need to touch priv if register_netdevice fails, so just
|
|
* always use this flow.
|
|
*/
|
|
ndev->priv_destructor = ipoib_intf_free;
|
|
|
|
/*
|
|
* Racing with unregister of the parent must be prevented by the
|
|
* caller.
|
|
*/
|
|
WARN_ON(ppriv->dev->reg_state != NETREG_REGISTERED);
|
|
|
|
if (pkey == 0 || pkey == 0x8000) {
|
|
result = -EINVAL;
|
|
goto out_early;
|
|
}
|
|
|
|
rn->mtu = priv->mcast_mtu;
|
|
|
|
priv->parent = ppriv->dev;
|
|
priv->pkey = pkey;
|
|
priv->child_type = type;
|
|
|
|
if (!is_child_unique(ppriv, priv)) {
|
|
result = -ENOTUNIQ;
|
|
goto out_early;
|
|
}
|
|
|
|
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.
|
|
*/
|
|
goto out_early;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
out_early:
|
|
if (ndev->priv_destructor)
|
|
ndev->priv_destructor(ndev);
|
|
return result;
|
|
}
|
|
|
|
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;
|
|
int result;
|
|
|
|
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);
|
|
|
|
snprintf(intf_name, sizeof(intf_name), "%s.%04x",
|
|
ppriv->dev->name, pkey);
|
|
|
|
ndev = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
|
|
if (IS_ERR(ndev)) {
|
|
result = PTR_ERR(ndev);
|
|
goto out;
|
|
}
|
|
priv = ipoib_priv(ndev);
|
|
|
|
ndev->rtnl_link_ops = ipoib_get_link_ops();
|
|
|
|
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;
|
|
}
|