294 lines
7.4 KiB
C
294 lines
7.4 KiB
C
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/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/sched/signal.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include "ipoib.h"
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static ssize_t parent_show(struct device *d, struct device_attribute *attr,
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char *buf)
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{
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struct net_device *dev = to_net_dev(d);
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struct ipoib_dev_priv *priv = ipoib_priv(dev);
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return sysfs_emit(buf, "%s\n", priv->parent->name);
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}
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static DEVICE_ATTR_RO(parent);
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static bool is_child_unique(struct ipoib_dev_priv *ppriv,
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struct ipoib_dev_priv *priv)
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{
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struct ipoib_dev_priv *tpriv;
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ASSERT_RTNL();
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/*
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* Since the legacy sysfs interface uses pkey for deletion it cannot
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* support more than one interface with the same pkey, it creates
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* ambiguity. The RTNL interface deletes using the netdev so it does
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* not have a problem to support duplicated pkeys.
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*/
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if (priv->child_type != IPOIB_LEGACY_CHILD)
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return true;
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/*
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* First ensure this isn't a duplicate. We check the parent device and
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* then all of the legacy child interfaces to make sure the Pkey
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* doesn't match.
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*/
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if (ppriv->pkey == priv->pkey)
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return false;
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list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
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if (tpriv->pkey == priv->pkey &&
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tpriv->child_type == IPOIB_LEGACY_CHILD)
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return false;
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}
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return true;
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}
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/*
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* NOTE: If this function fails then the priv->dev will remain valid, however
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* priv will have been freed and must not be touched by caller in the error
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* case.
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*
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* If (ndev->reg_state == NETREG_UNINITIALIZED) then it is up to the caller to
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* free the net_device (just as rtnl_newlink does) otherwise the net_device
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* will be freed when the rtnl is unlocked.
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*/
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int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
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u16 pkey, int type)
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{
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struct net_device *ndev = priv->dev;
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int result;
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struct rdma_netdev *rn = netdev_priv(ndev);
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ASSERT_RTNL();
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/*
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* We do not need to touch priv if register_netdevice fails, so just
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* always use this flow.
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*/
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ndev->priv_destructor = ipoib_intf_free;
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/*
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* Racing with unregister of the parent must be prevented by the
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* caller.
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*/
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WARN_ON(ppriv->dev->reg_state != NETREG_REGISTERED);
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if (pkey == 0 || pkey == 0x8000) {
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result = -EINVAL;
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goto out_early;
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}
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rn->mtu = priv->mcast_mtu;
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priv->parent = ppriv->dev;
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priv->pkey = pkey;
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priv->child_type = type;
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if (!is_child_unique(ppriv, priv)) {
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result = -ENOTUNIQ;
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goto out_early;
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}
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result = register_netdevice(ndev);
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if (result) {
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ipoib_warn(priv, "failed to initialize; error %i", result);
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/*
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* register_netdevice sometimes calls priv_destructor,
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* sometimes not. Make sure it was done.
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*/
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goto out_early;
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}
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/* RTNL childs don't need proprietary sysfs entries */
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if (type == IPOIB_LEGACY_CHILD) {
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if (ipoib_cm_add_mode_attr(ndev))
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goto sysfs_failed;
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if (ipoib_add_pkey_attr(ndev))
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goto sysfs_failed;
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if (ipoib_add_umcast_attr(ndev))
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goto sysfs_failed;
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if (device_create_file(&ndev->dev, &dev_attr_parent))
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goto sysfs_failed;
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}
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return 0;
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sysfs_failed:
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unregister_netdevice(priv->dev);
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return -ENOMEM;
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out_early:
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if (ndev->priv_destructor)
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ndev->priv_destructor(ndev);
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return result;
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}
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int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
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{
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struct ipoib_dev_priv *ppriv, *priv;
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char intf_name[IFNAMSIZ];
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struct net_device *ndev;
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int result;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (!rtnl_trylock())
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return restart_syscall();
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if (pdev->reg_state != NETREG_REGISTERED) {
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rtnl_unlock();
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return -EPERM;
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}
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ppriv = ipoib_priv(pdev);
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snprintf(intf_name, sizeof(intf_name), "%s.%04x",
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ppriv->dev->name, pkey);
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ndev = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
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if (IS_ERR(ndev)) {
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result = PTR_ERR(ndev);
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goto out;
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}
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priv = ipoib_priv(ndev);
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ndev->rtnl_link_ops = ipoib_get_link_ops();
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result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
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if (result && ndev->reg_state == NETREG_UNINITIALIZED)
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free_netdev(ndev);
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out:
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rtnl_unlock();
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return result;
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}
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struct ipoib_vlan_delete_work {
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struct work_struct work;
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struct net_device *dev;
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};
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/*
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* sysfs callbacks of a netdevice cannot obtain the rtnl lock as
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* unregister_netdev ultimately deletes the sysfs files while holding the rtnl
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* lock. This deadlocks the system.
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*
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* A callback can use rtnl_trylock to avoid the deadlock but it cannot call
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* unregister_netdev as that internally takes and releases the rtnl_lock. So
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* instead we find the netdev to unregister and then do the actual unregister
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* from the global work queue where we can obtain the rtnl_lock safely.
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*/
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static void ipoib_vlan_delete_task(struct work_struct *work)
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{
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struct ipoib_vlan_delete_work *pwork =
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container_of(work, struct ipoib_vlan_delete_work, work);
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struct net_device *dev = pwork->dev;
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rtnl_lock();
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/* Unregistering tasks can race with another task or parent removal */
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if (dev->reg_state == NETREG_REGISTERED) {
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struct ipoib_dev_priv *priv = ipoib_priv(dev);
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struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
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ipoib_dbg(ppriv, "delete child vlan %s\n", dev->name);
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unregister_netdevice(dev);
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}
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rtnl_unlock();
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kfree(pwork);
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}
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int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
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{
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struct ipoib_dev_priv *ppriv, *priv, *tpriv;
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int rc;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (!rtnl_trylock())
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return restart_syscall();
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if (pdev->reg_state != NETREG_REGISTERED) {
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rtnl_unlock();
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return -EPERM;
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}
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ppriv = ipoib_priv(pdev);
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rc = -ENODEV;
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list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
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if (priv->pkey == pkey &&
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priv->child_type == IPOIB_LEGACY_CHILD) {
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struct ipoib_vlan_delete_work *work;
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work = kmalloc(sizeof(*work), GFP_KERNEL);
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if (!work) {
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rc = -ENOMEM;
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goto out;
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}
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down_write(&ppriv->vlan_rwsem);
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list_del_init(&priv->list);
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up_write(&ppriv->vlan_rwsem);
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work->dev = priv->dev;
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INIT_WORK(&work->work, ipoib_vlan_delete_task);
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queue_work(ipoib_workqueue, &work->work);
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rc = 0;
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break;
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}
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}
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out:
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rtnl_unlock();
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return rc;
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}
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