x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / infiniband / core / netlink.c
blobda06abde9e0d557ae1536f1995cd1a84af6ab219
1 /*
2 * Copyright (c) 2010 Voltaire Inc. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
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.
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.
33 #define pr_fmt(fmt) "%s:%s: " fmt, KBUILD_MODNAME, __func__
35 #include <linux/export.h>
36 #include <net/netlink.h>
37 #include <net/net_namespace.h>
38 #include <net/sock.h>
39 #include <rdma/rdma_netlink.h>
41 struct ibnl_client {
42 struct list_head list;
43 int index;
44 int nops;
45 const struct ibnl_client_cbs *cb_table;
48 static DEFINE_MUTEX(ibnl_mutex);
49 static struct sock *nls;
50 static LIST_HEAD(client_list);
52 int ibnl_add_client(int index, int nops,
53 const struct ibnl_client_cbs cb_table[])
55 struct ibnl_client *cur;
56 struct ibnl_client *nl_client;
58 nl_client = kmalloc(sizeof *nl_client, GFP_KERNEL);
59 if (!nl_client)
60 return -ENOMEM;
62 nl_client->index = index;
63 nl_client->nops = nops;
64 nl_client->cb_table = cb_table;
66 mutex_lock(&ibnl_mutex);
68 list_for_each_entry(cur, &client_list, list) {
69 if (cur->index == index) {
70 pr_warn("Client for %d already exists\n", index);
71 mutex_unlock(&ibnl_mutex);
72 kfree(nl_client);
73 return -EINVAL;
77 list_add_tail(&nl_client->list, &client_list);
79 mutex_unlock(&ibnl_mutex);
81 return 0;
83 EXPORT_SYMBOL(ibnl_add_client);
85 int ibnl_remove_client(int index)
87 struct ibnl_client *cur, *next;
89 mutex_lock(&ibnl_mutex);
90 list_for_each_entry_safe(cur, next, &client_list, list) {
91 if (cur->index == index) {
92 list_del(&(cur->list));
93 mutex_unlock(&ibnl_mutex);
94 kfree(cur);
95 return 0;
98 pr_warn("Can't remove callback for client idx %d. Not found\n", index);
99 mutex_unlock(&ibnl_mutex);
101 return -EINVAL;
103 EXPORT_SYMBOL(ibnl_remove_client);
105 void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
106 int len, int client, int op)
108 unsigned char *prev_tail;
110 prev_tail = skb_tail_pointer(skb);
111 *nlh = nlmsg_put(skb, 0, seq, RDMA_NL_GET_TYPE(client, op),
112 len, NLM_F_MULTI);
113 if (!*nlh)
114 goto out_nlmsg_trim;
115 (*nlh)->nlmsg_len = skb_tail_pointer(skb) - prev_tail;
116 return nlmsg_data(*nlh);
118 out_nlmsg_trim:
119 nlmsg_trim(skb, prev_tail);
120 return NULL;
122 EXPORT_SYMBOL(ibnl_put_msg);
124 int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
125 int len, void *data, int type)
127 unsigned char *prev_tail;
129 prev_tail = skb_tail_pointer(skb);
130 if (nla_put(skb, type, len, data))
131 goto nla_put_failure;
132 nlh->nlmsg_len += skb_tail_pointer(skb) - prev_tail;
133 return 0;
135 nla_put_failure:
136 nlmsg_trim(skb, prev_tail - nlh->nlmsg_len);
137 return -EMSGSIZE;
139 EXPORT_SYMBOL(ibnl_put_attr);
141 static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
143 struct ibnl_client *client;
144 int type = nlh->nlmsg_type;
145 int index = RDMA_NL_GET_CLIENT(type);
146 int op = RDMA_NL_GET_OP(type);
148 list_for_each_entry(client, &client_list, list) {
149 if (client->index == index) {
150 if (op < 0 || op >= client->nops ||
151 !client->cb_table[RDMA_NL_GET_OP(op)].dump)
152 return -EINVAL;
155 struct netlink_dump_control c = {
156 .dump = client->cb_table[op].dump,
157 .module = client->cb_table[op].module,
159 return netlink_dump_start(nls, skb, nlh, &c);
164 pr_info("Index %d wasn't found in client list\n", index);
165 return -EINVAL;
168 static void ibnl_rcv(struct sk_buff *skb)
170 mutex_lock(&ibnl_mutex);
171 netlink_rcv_skb(skb, &ibnl_rcv_msg);
172 mutex_unlock(&ibnl_mutex);
175 int __init ibnl_init(void)
177 struct netlink_kernel_cfg cfg = {
178 .input = ibnl_rcv,
181 nls = netlink_kernel_create(&init_net, NETLINK_RDMA, &cfg);
182 if (!nls) {
183 pr_warn("Failed to create netlink socket\n");
184 return -ENOMEM;
187 return 0;
190 void ibnl_cleanup(void)
192 struct ibnl_client *cur, *next;
194 mutex_lock(&ibnl_mutex);
195 list_for_each_entry_safe(cur, next, &client_list, list) {
196 list_del(&(cur->list));
197 kfree(cur);
199 mutex_unlock(&ibnl_mutex);
201 netlink_kernel_release(nls);