Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / infiniband / ulp / ipoib / ipoib_vlan.c
1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  *
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:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
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.
22  *
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
30  * SOFTWARE.
31  */
32
33 #include <linux/module.h>
34
35 #include <linux/init.h>
36 #include <linux/seq_file.h>
37
38 #include <asm/uaccess.h>
39
40 #include "ipoib.h"
41
42 static ssize_t show_parent(struct device *d, struct device_attribute *attr,
43                            char *buf)
44 {
45         struct net_device *dev = to_net_dev(d);
46         struct ipoib_dev_priv *priv = netdev_priv(dev);
47
48         return sprintf(buf, "%s\n", priv->parent->name);
49 }
50 static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
51
52 int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
53                      u16 pkey, int type)
54 {
55         int result;
56
57         priv->max_ib_mtu = ppriv->max_ib_mtu;
58         /* MTU will be reset when mcast join happens */
59         priv->dev->mtu   = IPOIB_UD_MTU(priv->max_ib_mtu);
60         priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
61         priv->parent = ppriv->dev;
62         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
63
64         result = ipoib_set_dev_features(priv, ppriv->ca);
65         if (result)
66                 goto err;
67
68         priv->pkey = pkey;
69
70         memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
71         priv->dev->broadcast[8] = pkey >> 8;
72         priv->dev->broadcast[9] = pkey & 0xff;
73
74         result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
75         if (result < 0) {
76                 ipoib_warn(ppriv, "failed to initialize subinterface: "
77                            "device %s, port %d",
78                            ppriv->ca->name, ppriv->port);
79                 goto err;
80         }
81
82         result = register_netdevice(priv->dev);
83         if (result) {
84                 ipoib_warn(priv, "failed to initialize; error %i", result);
85                 goto register_failed;
86         }
87
88         ipoib_create_debug_files(priv->dev);
89
90         /* RTNL childs don't need proprietary sysfs entries */
91         if (type == IPOIB_LEGACY_CHILD) {
92                 if (ipoib_cm_add_mode_attr(priv->dev))
93                         goto sysfs_failed;
94                 if (ipoib_add_pkey_attr(priv->dev))
95                         goto sysfs_failed;
96                 if (ipoib_add_umcast_attr(priv->dev))
97                         goto sysfs_failed;
98
99                 if (device_create_file(&priv->dev->dev, &dev_attr_parent))
100                         goto sysfs_failed;
101         }
102
103         priv->child_type  = type;
104         list_add_tail(&priv->list, &ppriv->child_intfs);
105
106         return 0;
107
108 sysfs_failed:
109         result = -ENOMEM;
110         ipoib_delete_debug_files(priv->dev);
111         unregister_netdevice(priv->dev);
112
113 register_failed:
114         ipoib_dev_cleanup(priv->dev);
115
116 err:
117         return result;
118 }
119
120 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
121 {
122         struct ipoib_dev_priv *ppriv, *priv;
123         char intf_name[IFNAMSIZ];
124         struct ipoib_dev_priv *tpriv;
125         int result;
126
127         if (!capable(CAP_NET_ADMIN))
128                 return -EPERM;
129
130         ppriv = netdev_priv(pdev);
131
132         snprintf(intf_name, sizeof intf_name, "%s.%04x",
133                  ppriv->dev->name, pkey);
134         priv = ipoib_intf_alloc(intf_name);
135         if (!priv)
136                 return -ENOMEM;
137
138         if (!rtnl_trylock())
139                 return restart_syscall();
140
141         down_write(&ppriv->vlan_rwsem);
142
143         /*
144          * First ensure this isn't a duplicate. We check the parent device and
145          * then all of the legacy child interfaces to make sure the Pkey
146          * doesn't match.
147          */
148         if (ppriv->pkey == pkey) {
149                 result = -ENOTUNIQ;
150                 goto out;
151         }
152
153         list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
154                 if (tpriv->pkey == pkey &&
155                     tpriv->child_type == IPOIB_LEGACY_CHILD) {
156                         result = -ENOTUNIQ;
157                         goto out;
158                 }
159         }
160
161         result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
162
163 out:
164         up_write(&ppriv->vlan_rwsem);
165
166         if (result)
167                 free_netdev(priv->dev);
168
169         rtnl_unlock();
170
171         return result;
172 }
173
174 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
175 {
176         struct ipoib_dev_priv *ppriv, *priv, *tpriv;
177         struct net_device *dev = NULL;
178
179         if (!capable(CAP_NET_ADMIN))
180                 return -EPERM;
181
182         ppriv = netdev_priv(pdev);
183
184         if (!rtnl_trylock())
185                 return restart_syscall();
186
187         down_write(&ppriv->vlan_rwsem);
188         list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
189                 if (priv->pkey == pkey &&
190                     priv->child_type == IPOIB_LEGACY_CHILD) {
191                         unregister_netdevice(priv->dev);
192                         list_del(&priv->list);
193                         dev = priv->dev;
194                         break;
195                 }
196         }
197         up_write(&ppriv->vlan_rwsem);
198
199         rtnl_unlock();
200
201         if (dev) {
202                 free_netdev(dev);
203                 return 0;
204         }
205
206         return -ENODEV;
207 }