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 #include <linux/sched/signal.h>
35
36 #include <linux/init.h>
37 #include <linux/seq_file.h>
38
39 #include <linux/uaccess.h>
40
41 #include "ipoib.h"
42
show_parent(struct device * d,struct device_attribute * attr,char * buf)43 static ssize_t show_parent(struct device *d, struct device_attribute *attr,
44 char *buf)
45 {
46 struct net_device *dev = to_net_dev(d);
47 struct ipoib_dev_priv *priv = ipoib_priv(dev);
48
49 return sprintf(buf, "%s\n", priv->parent->name);
50 }
51 static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
52
__ipoib_vlan_add(struct ipoib_dev_priv * ppriv,struct ipoib_dev_priv * priv,u16 pkey,int type)53 int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
54 u16 pkey, int type)
55 {
56 int result;
57
58 priv->max_ib_mtu = ppriv->max_ib_mtu;
59 /* MTU will be reset when mcast join happens */
60 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
61 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
62 priv->parent = ppriv->dev;
63 set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
64
65 ipoib_set_dev_features(priv, ppriv->ca);
66
67 priv->pkey = pkey;
68
69 memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
70 memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
71 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
72 priv->dev->broadcast[8] = pkey >> 8;
73 priv->dev->broadcast[9] = pkey & 0xff;
74
75 result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
76 if (result < 0) {
77 ipoib_warn(ppriv, "failed to initialize subinterface: "
78 "device %s, port %d",
79 ppriv->ca->name, ppriv->port);
80 goto err;
81 }
82
83 result = register_netdevice(priv->dev);
84 if (result) {
85 ipoib_warn(priv, "failed to initialize; error %i", result);
86 goto register_failed;
87 }
88
89 /* RTNL childs don't need proprietary sysfs entries */
90 if (type == IPOIB_LEGACY_CHILD) {
91 if (ipoib_cm_add_mode_attr(priv->dev))
92 goto sysfs_failed;
93 if (ipoib_add_pkey_attr(priv->dev))
94 goto sysfs_failed;
95 if (ipoib_add_umcast_attr(priv->dev))
96 goto sysfs_failed;
97
98 if (device_create_file(&priv->dev->dev, &dev_attr_parent))
99 goto sysfs_failed;
100 }
101
102 priv->child_type = type;
103 list_add_tail(&priv->list, &ppriv->child_intfs);
104
105 return 0;
106
107 sysfs_failed:
108 result = -ENOMEM;
109 unregister_netdevice(priv->dev);
110
111 register_failed:
112 ipoib_dev_cleanup(priv->dev);
113
114 err:
115 return result;
116 }
117
ipoib_vlan_add(struct net_device * pdev,unsigned short pkey)118 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
119 {
120 struct ipoib_dev_priv *ppriv, *priv;
121 char intf_name[IFNAMSIZ];
122 struct ipoib_dev_priv *tpriv;
123 int result;
124
125 if (!capable(CAP_NET_ADMIN))
126 return -EPERM;
127
128 ppriv = ipoib_priv(pdev);
129
130 if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
131 return -EPERM;
132
133 snprintf(intf_name, sizeof intf_name, "%s.%04x",
134 ppriv->dev->name, pkey);
135
136 if (!mutex_trylock(&ppriv->sysfs_mutex))
137 return restart_syscall();
138
139 if (!rtnl_trylock()) {
140 mutex_unlock(&ppriv->sysfs_mutex);
141 return restart_syscall();
142 }
143
144 if (!down_write_trylock(&ppriv->vlan_rwsem)) {
145 rtnl_unlock();
146 mutex_unlock(&ppriv->sysfs_mutex);
147 return restart_syscall();
148 }
149
150 priv = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
151 if (!priv) {
152 result = -ENOMEM;
153 goto out;
154 }
155
156 /*
157 * First ensure this isn't a duplicate. We check the parent device and
158 * then all of the legacy child interfaces to make sure the Pkey
159 * doesn't match.
160 */
161 if (ppriv->pkey == pkey) {
162 result = -ENOTUNIQ;
163 goto out;
164 }
165
166 list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
167 if (tpriv->pkey == pkey &&
168 tpriv->child_type == IPOIB_LEGACY_CHILD) {
169 result = -ENOTUNIQ;
170 goto out;
171 }
172 }
173
174 result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
175
176 out:
177 up_write(&ppriv->vlan_rwsem);
178 rtnl_unlock();
179 mutex_unlock(&ppriv->sysfs_mutex);
180
181 if (result && priv) {
182 struct rdma_netdev *rn;
183
184 rn = netdev_priv(priv->dev);
185 rn->free_rdma_netdev(priv->dev);
186 kfree(priv);
187 }
188
189 return result;
190 }
191
ipoib_vlan_delete(struct net_device * pdev,unsigned short pkey)192 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
193 {
194 struct ipoib_dev_priv *ppriv, *priv, *tpriv;
195 struct net_device *dev = NULL;
196
197 if (!capable(CAP_NET_ADMIN))
198 return -EPERM;
199
200 ppriv = ipoib_priv(pdev);
201
202 if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
203 return -EPERM;
204
205 if (!mutex_trylock(&ppriv->sysfs_mutex))
206 return restart_syscall();
207
208 if (!rtnl_trylock()) {
209 mutex_unlock(&ppriv->sysfs_mutex);
210 return restart_syscall();
211 }
212
213 if (!down_write_trylock(&ppriv->vlan_rwsem)) {
214 rtnl_unlock();
215 mutex_unlock(&ppriv->sysfs_mutex);
216 return restart_syscall();
217 }
218
219 list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
220 if (priv->pkey == pkey &&
221 priv->child_type == IPOIB_LEGACY_CHILD) {
222 list_del(&priv->list);
223 dev = priv->dev;
224 break;
225 }
226 }
227 up_write(&ppriv->vlan_rwsem);
228
229 if (dev) {
230 ipoib_dbg(ppriv, "delete child vlan %s\n", dev->name);
231 unregister_netdevice(dev);
232 }
233
234 rtnl_unlock();
235 mutex_unlock(&ppriv->sysfs_mutex);
236
237 if (dev) {
238 struct rdma_netdev *rn;
239
240 rn = netdev_priv(dev);
241 rn->free_rdma_netdev(priv->dev);
242 kfree(priv);
243 return 0;
244 }
245
246 return -ENODEV;
247 }
248