2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/sched/signal.h>
35 #include <linux/init.h>
36 #include <linux/seq_file.h>
38 #include <linux/uaccess.h>
42 static ssize_t parent_show(struct device *d, struct device_attribute *attr,
45 struct net_device *dev = to_net_dev(d);
46 struct ipoib_dev_priv *priv = ipoib_priv(dev);
48 return sysfs_emit(buf, "%s\n", priv->parent->name);
50 static DEVICE_ATTR_RO(parent);
52 static bool is_child_unique(struct ipoib_dev_priv *ppriv,
53 struct ipoib_dev_priv *priv)
55 struct ipoib_dev_priv *tpriv;
60 * Since the legacy sysfs interface uses pkey for deletion it cannot
61 * support more than one interface with the same pkey, it creates
62 * ambiguity. The RTNL interface deletes using the netdev so it does
63 * not have a problem to support duplicated pkeys.
65 if (priv->child_type != IPOIB_LEGACY_CHILD)
69 * First ensure this isn't a duplicate. We check the parent device and
70 * then all of the legacy child interfaces to make sure the Pkey
73 if (ppriv->pkey == priv->pkey)
76 list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
77 if (tpriv->pkey == priv->pkey &&
78 tpriv->child_type == IPOIB_LEGACY_CHILD)
86 * NOTE: If this function fails then the priv->dev will remain valid, however
87 * priv will have been freed and must not be touched by caller in the error
90 * If (ndev->reg_state == NETREG_UNINITIALIZED) then it is up to the caller to
91 * free the net_device (just as rtnl_newlink does) otherwise the net_device
92 * will be freed when the rtnl is unlocked.
94 int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
97 struct net_device *ndev = priv->dev;
99 struct rdma_netdev *rn = netdev_priv(ndev);
104 * We do not need to touch priv if register_netdevice fails, so just
105 * always use this flow.
107 ndev->priv_destructor = ipoib_intf_free;
110 * Racing with unregister of the parent must be prevented by the
113 WARN_ON(ppriv->dev->reg_state != NETREG_REGISTERED);
115 if (pkey == 0 || pkey == 0x8000) {
120 rn->mtu = priv->mcast_mtu;
122 priv->parent = ppriv->dev;
124 priv->child_type = type;
126 if (!is_child_unique(ppriv, priv)) {
131 result = register_netdevice(ndev);
133 ipoib_warn(priv, "failed to initialize; error %i", result);
136 * register_netdevice sometimes calls priv_destructor,
137 * sometimes not. Make sure it was done.
142 /* RTNL childs don't need proprietary sysfs entries */
143 if (type == IPOIB_LEGACY_CHILD) {
144 if (ipoib_cm_add_mode_attr(ndev))
146 if (ipoib_add_pkey_attr(ndev))
148 if (ipoib_add_umcast_attr(ndev))
151 if (device_create_file(&ndev->dev, &dev_attr_parent))
158 unregister_netdevice(priv->dev);
162 if (ndev->priv_destructor)
163 ndev->priv_destructor(ndev);
167 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
169 struct ipoib_dev_priv *ppriv, *priv;
170 char intf_name[IFNAMSIZ];
171 struct net_device *ndev;
174 if (!capable(CAP_NET_ADMIN))
178 return restart_syscall();
180 if (pdev->reg_state != NETREG_REGISTERED) {
185 ppriv = ipoib_priv(pdev);
187 snprintf(intf_name, sizeof(intf_name), "%s.%04x",
188 ppriv->dev->name, pkey);
190 ndev = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
192 result = PTR_ERR(ndev);
195 priv = ipoib_priv(ndev);
197 ndev->rtnl_link_ops = ipoib_get_link_ops();
199 result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
201 if (result && ndev->reg_state == NETREG_UNINITIALIZED)
210 struct ipoib_vlan_delete_work {
211 struct work_struct work;
212 struct net_device *dev;
216 * sysfs callbacks of a netdevice cannot obtain the rtnl lock as
217 * unregister_netdev ultimately deletes the sysfs files while holding the rtnl
218 * lock. This deadlocks the system.
220 * A callback can use rtnl_trylock to avoid the deadlock but it cannot call
221 * unregister_netdev as that internally takes and releases the rtnl_lock. So
222 * instead we find the netdev to unregister and then do the actual unregister
223 * from the global work queue where we can obtain the rtnl_lock safely.
225 static void ipoib_vlan_delete_task(struct work_struct *work)
227 struct ipoib_vlan_delete_work *pwork =
228 container_of(work, struct ipoib_vlan_delete_work, work);
229 struct net_device *dev = pwork->dev;
233 /* Unregistering tasks can race with another task or parent removal */
234 if (dev->reg_state == NETREG_REGISTERED) {
235 struct ipoib_dev_priv *priv = ipoib_priv(dev);
236 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
238 ipoib_dbg(ppriv, "delete child vlan %s\n", dev->name);
239 unregister_netdevice(dev);
247 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
249 struct ipoib_dev_priv *ppriv, *priv, *tpriv;
252 if (!capable(CAP_NET_ADMIN))
256 return restart_syscall();
258 if (pdev->reg_state != NETREG_REGISTERED) {
263 ppriv = ipoib_priv(pdev);
266 list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
267 if (priv->pkey == pkey &&
268 priv->child_type == IPOIB_LEGACY_CHILD) {
269 struct ipoib_vlan_delete_work *work;
271 work = kmalloc(sizeof(*work), GFP_KERNEL);
277 down_write(&ppriv->vlan_rwsem);
278 list_del_init(&priv->list);
279 up_write(&ppriv->vlan_rwsem);
280 work->dev = priv->dev;
281 INIT_WORK(&work->work, ipoib_vlan_delete_task);
282 queue_work(ipoib_workqueue, &work->work);