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 	set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
62 
63 	result = ipoib_set_dev_features(priv, ppriv->ca);
64 	if (result)
65 		goto err;
66 
67 	priv->pkey = pkey;
68 
69 	memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
70 	priv->dev->broadcast[8] = pkey >> 8;
71 	priv->dev->broadcast[9] = pkey & 0xff;
72 
73 	result = ipoib_dev_init(priv->dev, ppriv->ca, ppriv->port);
74 	if (result < 0) {
75 		ipoib_warn(ppriv, "failed to initialize subinterface: "
76 			   "device %s, port %d",
77 			   ppriv->ca->name, ppriv->port);
78 		goto err;
79 	}
80 
81 	result = register_netdevice(priv->dev);
82 	if (result) {
83 		ipoib_warn(priv, "failed to initialize; error %i", result);
84 		goto register_failed;
85 	}
86 
87 	priv->parent = ppriv->dev;
88 
89 	ipoib_create_debug_files(priv->dev);
90 
91 	/* RTNL childs don't need proprietary sysfs entries */
92 	if (type == IPOIB_LEGACY_CHILD) {
93 		if (ipoib_cm_add_mode_attr(priv->dev))
94 			goto sysfs_failed;
95 		if (ipoib_add_pkey_attr(priv->dev))
96 			goto sysfs_failed;
97 		if (ipoib_add_umcast_attr(priv->dev))
98 			goto sysfs_failed;
99 
100 		if (device_create_file(&priv->dev->dev, &dev_attr_parent))
101 			goto sysfs_failed;
102 	}
103 
104 	priv->child_type  = type;
105 	priv->dev->iflink = ppriv->dev->ifindex;
106 	list_add_tail(&priv->list, &ppriv->child_intfs);
107 
108 	return 0;
109 
110 sysfs_failed:
111 	result = -ENOMEM;
112 	ipoib_delete_debug_files(priv->dev);
113 	unregister_netdevice(priv->dev);
114 
115 register_failed:
116 	ipoib_dev_cleanup(priv->dev);
117 
118 err:
119 	return result;
120 }
121 
122 int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
123 {
124 	struct ipoib_dev_priv *ppriv, *priv;
125 	char intf_name[IFNAMSIZ];
126 	struct ipoib_dev_priv *tpriv;
127 	int result;
128 
129 	if (!capable(CAP_NET_ADMIN))
130 		return -EPERM;
131 
132 	ppriv = netdev_priv(pdev);
133 
134 	snprintf(intf_name, sizeof intf_name, "%s.%04x",
135 		 ppriv->dev->name, pkey);
136 	priv = ipoib_intf_alloc(intf_name);
137 	if (!priv)
138 		return -ENOMEM;
139 
140 	if (!rtnl_trylock())
141 		return restart_syscall();
142 
143 	down_write(&ppriv->vlan_rwsem);
144 
145 	/*
146 	 * First ensure this isn't a duplicate. We check the parent device and
147 	 * then all of the legacy child interfaces to make sure the Pkey
148 	 * doesn't match.
149 	 */
150 	if (ppriv->pkey == pkey) {
151 		result = -ENOTUNIQ;
152 		goto out;
153 	}
154 
155 	list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
156 		if (tpriv->pkey == pkey &&
157 		    tpriv->child_type == IPOIB_LEGACY_CHILD) {
158 			result = -ENOTUNIQ;
159 			goto out;
160 		}
161 	}
162 
163 	result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
164 
165 out:
166 	up_write(&ppriv->vlan_rwsem);
167 
168 	if (result)
169 		free_netdev(priv->dev);
170 
171 	rtnl_unlock();
172 
173 	return result;
174 }
175 
176 int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
177 {
178 	struct ipoib_dev_priv *ppriv, *priv, *tpriv;
179 	struct net_device *dev = NULL;
180 
181 	if (!capable(CAP_NET_ADMIN))
182 		return -EPERM;
183 
184 	ppriv = netdev_priv(pdev);
185 
186 	if (!rtnl_trylock())
187 		return restart_syscall();
188 
189 	down_write(&ppriv->vlan_rwsem);
190 	list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
191 		if (priv->pkey == pkey &&
192 		    priv->child_type == IPOIB_LEGACY_CHILD) {
193 			unregister_netdevice(priv->dev);
194 			list_del(&priv->list);
195 			dev = priv->dev;
196 			break;
197 		}
198 	}
199 	up_write(&ppriv->vlan_rwsem);
200 
201 	rtnl_unlock();
202 
203 	if (dev) {
204 		free_netdev(dev);
205 		return 0;
206 	}
207 
208 	return -ENODEV;
209 }
210