1 /*
2  * Copyright (c) 2012 Mellanox Technologies. -  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/netdevice.h>
34 #include <linux/if_arp.h>      /* For ARPHRD_xxx */
35 #include <net/rtnetlink.h>
36 #include "ipoib.h"
37 
38 static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
39 	[IFLA_IPOIB_PKEY]	= { .type = NLA_U16 },
40 	[IFLA_IPOIB_MODE]	= { .type = NLA_U16 },
41 	[IFLA_IPOIB_UMCAST]	= { .type = NLA_U16 },
42 };
43 
44 static unsigned int ipoib_get_max_num_queues(void)
45 {
46 	return min_t(unsigned int, num_possible_cpus(), 128);
47 }
48 
49 static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
50 {
51 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
52 	u16 val;
53 
54 	if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
55 		goto nla_put_failure;
56 
57 	val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
58 	if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
59 		goto nla_put_failure;
60 
61 	val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
62 	if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
63 		goto nla_put_failure;
64 
65 	return 0;
66 
67 nla_put_failure:
68 	return -EMSGSIZE;
69 }
70 
71 static int ipoib_changelink(struct net_device *dev, struct nlattr *tb[],
72 			    struct nlattr *data[],
73 			    struct netlink_ext_ack *extack)
74 {
75 	u16 mode, umcast;
76 	int ret = 0;
77 
78 	if (data[IFLA_IPOIB_MODE]) {
79 		mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
80 		if (mode == IPOIB_MODE_DATAGRAM)
81 			ret = ipoib_set_mode(dev, "datagram\n");
82 		else if (mode == IPOIB_MODE_CONNECTED)
83 			ret = ipoib_set_mode(dev, "connected\n");
84 		else
85 			ret = -EINVAL;
86 
87 		if (ret < 0)
88 			goto out_err;
89 	}
90 
91 	if (data[IFLA_IPOIB_UMCAST]) {
92 		umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
93 		ipoib_set_umcast(dev, umcast);
94 	}
95 
96 out_err:
97 	return ret;
98 }
99 
100 static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
101 				struct nlattr *tb[], struct nlattr *data[],
102 				struct netlink_ext_ack *extack)
103 {
104 	struct net_device *pdev;
105 	struct ipoib_dev_priv *ppriv;
106 	u16 child_pkey;
107 	int err;
108 
109 	if (!tb[IFLA_LINK])
110 		return -EINVAL;
111 
112 	pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
113 	if (!pdev || pdev->type != ARPHRD_INFINIBAND)
114 		return -ENODEV;
115 
116 	ppriv = ipoib_priv(pdev);
117 
118 	if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
119 		ipoib_warn(ppriv, "child creation disallowed for child devices\n");
120 		return -EINVAL;
121 	}
122 
123 	if (!data || !data[IFLA_IPOIB_PKEY]) {
124 		ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
125 		child_pkey  = ppriv->pkey;
126 	} else
127 		child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);
128 
129 	err = ipoib_intf_init(ppriv->ca, ppriv->port, dev->name, dev);
130 	if (err) {
131 		ipoib_warn(ppriv, "failed to initialize pkey device\n");
132 		return err;
133 	}
134 
135 	err = __ipoib_vlan_add(ppriv, ipoib_priv(dev),
136 			       child_pkey, IPOIB_RTNL_CHILD);
137 	if (err)
138 		return err;
139 
140 	if (data) {
141 		err = ipoib_changelink(dev, tb, data, extack);
142 		if (err) {
143 			unregister_netdevice(dev);
144 			return err;
145 		}
146 	}
147 
148 	return 0;
149 }
150 
151 static void ipoib_del_child_link(struct net_device *dev, struct list_head *head)
152 {
153 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
154 
155 	if (!priv->parent)
156 		return;
157 
158 	unregister_netdevice_queue(dev, head);
159 }
160 
161 static size_t ipoib_get_size(const struct net_device *dev)
162 {
163 	return nla_total_size(2) +	/* IFLA_IPOIB_PKEY   */
164 		nla_total_size(2) +	/* IFLA_IPOIB_MODE   */
165 		nla_total_size(2);	/* IFLA_IPOIB_UMCAST */
166 }
167 
168 static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
169 	.kind		= "ipoib",
170 	.netns_refund   = true,
171 	.maxtype	= IFLA_IPOIB_MAX,
172 	.policy		= ipoib_policy,
173 	.priv_size	= sizeof(struct ipoib_dev_priv),
174 	.setup		= ipoib_setup_common,
175 	.newlink	= ipoib_new_child_link,
176 	.dellink	= ipoib_del_child_link,
177 	.changelink	= ipoib_changelink,
178 	.get_size	= ipoib_get_size,
179 	.fill_info	= ipoib_fill_info,
180 	.get_num_rx_queues = ipoib_get_max_num_queues,
181 	.get_num_tx_queues = ipoib_get_max_num_queues,
182 };
183 
184 struct rtnl_link_ops *ipoib_get_link_ops(void)
185 {
186 	return &ipoib_link_ops;
187 }
188 
189 int __init ipoib_netlink_init(void)
190 {
191 	return rtnl_link_register(&ipoib_link_ops);
192 }
193 
194 void __exit ipoib_netlink_fini(void)
195 {
196 	rtnl_link_unregister(&ipoib_link_ops);
197 }
198 
199 MODULE_ALIAS_RTNL_LINK("ipoib");
200