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 <linux/module.h>
36#include <net/rtnetlink.h>
37#include "ipoib.h"
38
39static const struct nla_policy ipoib_policy[IFLA_IPOIB_MAX + 1] = {
40	[IFLA_IPOIB_PKEY]	= { .type = NLA_U16 },
41	[IFLA_IPOIB_MODE]	= { .type = NLA_U16 },
42	[IFLA_IPOIB_UMCAST]	= { .type = NLA_U16 },
43};
44
45static unsigned int ipoib_get_max_num_queues(void)
46{
47	return min_t(unsigned int, num_possible_cpus(), 128);
48}
49
50static int ipoib_fill_info(struct sk_buff *skb, const struct net_device *dev)
51{
52	struct ipoib_dev_priv *priv = ipoib_priv(dev);
53	u16 val;
54
55	if (nla_put_u16(skb, IFLA_IPOIB_PKEY, priv->pkey))
56		goto nla_put_failure;
57
58	val = test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
59	if (nla_put_u16(skb, IFLA_IPOIB_MODE, val))
60		goto nla_put_failure;
61
62	val = test_bit(IPOIB_FLAG_UMCAST, &priv->flags);
63	if (nla_put_u16(skb, IFLA_IPOIB_UMCAST, val))
64		goto nla_put_failure;
65
66	return 0;
67
68nla_put_failure:
69	return -EMSGSIZE;
70}
71
72static int ipoib_changelink(struct net_device *dev, struct nlattr *tb[],
73			    struct nlattr *data[],
74			    struct netlink_ext_ack *extack)
75{
76	u16 mode, umcast;
77	int ret = 0;
78
79	if (data[IFLA_IPOIB_MODE]) {
80		mode  = nla_get_u16(data[IFLA_IPOIB_MODE]);
81		if (mode == IPOIB_MODE_DATAGRAM)
82			ret = ipoib_set_mode(dev, "datagram\n");
83		else if (mode == IPOIB_MODE_CONNECTED)
84			ret = ipoib_set_mode(dev, "connected\n");
85		else
86			ret = -EINVAL;
87
88		if (ret < 0)
89			goto out_err;
90	}
91
92	if (data[IFLA_IPOIB_UMCAST]) {
93		umcast = nla_get_u16(data[IFLA_IPOIB_UMCAST]);
94		ipoib_set_umcast(dev, umcast);
95	}
96
97out_err:
98	return ret;
99}
100
101static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
102				struct nlattr *tb[], struct nlattr *data[],
103				struct netlink_ext_ack *extack)
104{
105	struct net_device *pdev;
106	struct ipoib_dev_priv *ppriv;
107	u16 child_pkey;
108	int err;
109
110	if (!tb[IFLA_LINK])
111		return -EINVAL;
112
113	pdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
114	if (!pdev || pdev->type != ARPHRD_INFINIBAND)
115		return -ENODEV;
116
117	ppriv = ipoib_priv(pdev);
118
119	if (test_bit(IPOIB_FLAG_SUBINTERFACE, &ppriv->flags)) {
120		ipoib_warn(ppriv, "child creation disallowed for child devices\n");
121		return -EINVAL;
122	}
123
124	if (!data || !data[IFLA_IPOIB_PKEY]) {
125		ipoib_dbg(ppriv, "no pkey specified, using parent pkey\n");
126		child_pkey  = ppriv->pkey;
127	} else
128		child_pkey  = nla_get_u16(data[IFLA_IPOIB_PKEY]);
129
130	err = ipoib_intf_init(ppriv->ca, ppriv->port, dev->name, dev);
131	if (err) {
132		ipoib_warn(ppriv, "failed to initialize pkey device\n");
133		return err;
134	}
135
136	err = __ipoib_vlan_add(ppriv, ipoib_priv(dev),
137			       child_pkey, IPOIB_RTNL_CHILD);
138	if (err)
139		return err;
140
141	if (data) {
142		err = ipoib_changelink(dev, tb, data, extack);
143		if (err) {
144			unregister_netdevice(dev);
145			return err;
146		}
147	}
148
149	return 0;
150}
151
152static void ipoib_del_child_link(struct net_device *dev, struct list_head *head)
153{
154	struct ipoib_dev_priv *priv = ipoib_priv(dev);
155
156	if (!priv->parent)
157		return;
158
159	unregister_netdevice_queue(dev, head);
160}
161
162static size_t ipoib_get_size(const struct net_device *dev)
163{
164	return nla_total_size(2) +	/* IFLA_IPOIB_PKEY   */
165		nla_total_size(2) +	/* IFLA_IPOIB_MODE   */
166		nla_total_size(2);	/* IFLA_IPOIB_UMCAST */
167}
168
169static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
170	.kind		= "ipoib",
171	.netns_refund   = true,
172	.maxtype	= IFLA_IPOIB_MAX,
173	.policy		= ipoib_policy,
174	.priv_size	= sizeof(struct ipoib_dev_priv),
175	.setup		= ipoib_setup_common,
176	.newlink	= ipoib_new_child_link,
177	.dellink	= ipoib_del_child_link,
178	.changelink	= ipoib_changelink,
179	.get_size	= ipoib_get_size,
180	.fill_info	= ipoib_fill_info,
181	.get_num_rx_queues = ipoib_get_max_num_queues,
182	.get_num_tx_queues = ipoib_get_max_num_queues,
183};
184
185struct rtnl_link_ops *ipoib_get_link_ops(void)
186{
187	return &ipoib_link_ops;
188}
189
190int __init ipoib_netlink_init(void)
191{
192	return rtnl_link_register(&ipoib_link_ops);
193}
194
195void __exit ipoib_netlink_fini(void)
196{
197	rtnl_link_unregister(&ipoib_link_ops);
198}
199
200MODULE_ALIAS_RTNL_LINK("ipoib");
201