WorkStruct: make allyesconfig
[linux-3.10.git] / drivers / infiniband / core / addr.c
1 /*
2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5  * Copyright (c) 2005 Intel Corporation.  All rights reserved.
6  *
7  * This Software is licensed under one of the following licenses:
8  *
9  * 1) under the terms of the "Common Public License 1.0" a copy of which is
10  *    available from the Open Source Initiative, see
11  *    http://www.opensource.org/licenses/cpl.php.
12  *
13  * 2) under the terms of the "The BSD License" a copy of which is
14  *    available from the Open Source Initiative, see
15  *    http://www.opensource.org/licenses/bsd-license.php.
16  *
17  * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
18  *    copy of which is available from the Open Source Initiative, see
19  *    http://www.opensource.org/licenses/gpl-license.php.
20  *
21  * Licensee has the right to choose one of the above licenses.
22  *
23  * Redistributions of source code must retain the above copyright
24  * notice and one of the license notices.
25  *
26  * Redistributions in binary form must reproduce both the above copyright
27  * notice, one of the license notices in the documentation
28  * and/or other materials provided with the distribution.
29  */
30
31 #include <linux/mutex.h>
32 #include <linux/inetdevice.h>
33 #include <linux/workqueue.h>
34 #include <linux/if_arp.h>
35 #include <net/arp.h>
36 #include <net/neighbour.h>
37 #include <net/route.h>
38 #include <net/netevent.h>
39 #include <rdma/ib_addr.h>
40
41 MODULE_AUTHOR("Sean Hefty");
42 MODULE_DESCRIPTION("IB Address Translation");
43 MODULE_LICENSE("Dual BSD/GPL");
44
45 struct addr_req {
46         struct list_head list;
47         struct sockaddr src_addr;
48         struct sockaddr dst_addr;
49         struct rdma_dev_addr *addr;
50         struct rdma_addr_client *client;
51         void *context;
52         void (*callback)(int status, struct sockaddr *src_addr,
53                          struct rdma_dev_addr *addr, void *context);
54         unsigned long timeout;
55         int status;
56 };
57
58 static void process_req(struct work_struct *work);
59
60 static DEFINE_MUTEX(lock);
61 static LIST_HEAD(req_list);
62 static DECLARE_DELAYED_WORK(work, process_req);
63 static struct workqueue_struct *addr_wq;
64
65 void rdma_addr_register_client(struct rdma_addr_client *client)
66 {
67         atomic_set(&client->refcount, 1);
68         init_completion(&client->comp);
69 }
70 EXPORT_SYMBOL(rdma_addr_register_client);
71
72 static inline void put_client(struct rdma_addr_client *client)
73 {
74         if (atomic_dec_and_test(&client->refcount))
75                 complete(&client->comp);
76 }
77
78 void rdma_addr_unregister_client(struct rdma_addr_client *client)
79 {
80         put_client(client);
81         wait_for_completion(&client->comp);
82 }
83 EXPORT_SYMBOL(rdma_addr_unregister_client);
84
85 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
86                      const unsigned char *dst_dev_addr)
87 {
88         switch (dev->type) {
89         case ARPHRD_INFINIBAND:
90                 dev_addr->dev_type = RDMA_NODE_IB_CA;
91                 break;
92         case ARPHRD_ETHER:
93                 dev_addr->dev_type = RDMA_NODE_RNIC;
94                 break;
95         default:
96                 return -EADDRNOTAVAIL;
97         }
98
99         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
100         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
101         if (dst_dev_addr)
102                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
103         return 0;
104 }
105 EXPORT_SYMBOL(rdma_copy_addr);
106
107 int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
108 {
109         struct net_device *dev;
110         __be32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
111         int ret;
112
113         dev = ip_dev_find(ip);
114         if (!dev)
115                 return -EADDRNOTAVAIL;
116
117         ret = rdma_copy_addr(dev_addr, dev, NULL);
118         dev_put(dev);
119         return ret;
120 }
121 EXPORT_SYMBOL(rdma_translate_ip);
122
123 static void set_timeout(unsigned long time)
124 {
125         unsigned long delay;
126
127         cancel_delayed_work(&work);
128
129         delay = time - jiffies;
130         if ((long)delay <= 0)
131                 delay = 1;
132
133         queue_delayed_work(addr_wq, &work, delay);
134 }
135
136 static void queue_req(struct addr_req *req)
137 {
138         struct addr_req *temp_req;
139
140         mutex_lock(&lock);
141         list_for_each_entry_reverse(temp_req, &req_list, list) {
142                 if (time_after(req->timeout, temp_req->timeout))
143                         break;
144         }
145
146         list_add(&req->list, &temp_req->list);
147
148         if (req_list.next == &req->list)
149                 set_timeout(req->timeout);
150         mutex_unlock(&lock);
151 }
152
153 static void addr_send_arp(struct sockaddr_in *dst_in)
154 {
155         struct rtable *rt;
156         struct flowi fl;
157         u32 dst_ip = dst_in->sin_addr.s_addr;
158
159         memset(&fl, 0, sizeof fl);
160         fl.nl_u.ip4_u.daddr = dst_ip;
161         if (ip_route_output_key(&rt, &fl))
162                 return;
163
164         arp_send(ARPOP_REQUEST, ETH_P_ARP, rt->rt_gateway, rt->idev->dev,
165                  rt->rt_src, NULL, rt->idev->dev->dev_addr, NULL);
166         ip_rt_put(rt);
167 }
168
169 static int addr_resolve_remote(struct sockaddr_in *src_in,
170                                struct sockaddr_in *dst_in,
171                                struct rdma_dev_addr *addr)
172 {
173         u32 src_ip = src_in->sin_addr.s_addr;
174         u32 dst_ip = dst_in->sin_addr.s_addr;
175         struct flowi fl;
176         struct rtable *rt;
177         struct neighbour *neigh;
178         int ret;
179
180         memset(&fl, 0, sizeof fl);
181         fl.nl_u.ip4_u.daddr = dst_ip;
182         fl.nl_u.ip4_u.saddr = src_ip;
183         ret = ip_route_output_key(&rt, &fl);
184         if (ret)
185                 goto out;
186
187         /* If the device does ARP internally, return 'done' */
188         if (rt->idev->dev->flags & IFF_NOARP) {
189                 rdma_copy_addr(addr, rt->idev->dev, NULL);
190                 goto put;
191         }
192
193         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
194         if (!neigh) {
195                 ret = -ENODATA;
196                 goto put;
197         }
198
199         if (!(neigh->nud_state & NUD_VALID)) {
200                 ret = -ENODATA;
201                 goto release;
202         }
203
204         if (!src_ip) {
205                 src_in->sin_family = dst_in->sin_family;
206                 src_in->sin_addr.s_addr = rt->rt_src;
207         }
208
209         ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
210 release:
211         neigh_release(neigh);
212 put:
213         ip_rt_put(rt);
214 out:
215         return ret;
216 }
217
218 static void process_req(struct work_struct *work)
219 {
220         struct addr_req *req, *temp_req;
221         struct sockaddr_in *src_in, *dst_in;
222         struct list_head done_list;
223
224         INIT_LIST_HEAD(&done_list);
225
226         mutex_lock(&lock);
227         list_for_each_entry_safe(req, temp_req, &req_list, list) {
228                 if (req->status) {
229                         src_in = (struct sockaddr_in *) &req->src_addr;
230                         dst_in = (struct sockaddr_in *) &req->dst_addr;
231                         req->status = addr_resolve_remote(src_in, dst_in,
232                                                           req->addr);
233                 }
234                 if (req->status && time_after(jiffies, req->timeout))
235                         req->status = -ETIMEDOUT;
236                 else if (req->status == -ENODATA)
237                         continue;
238
239                 list_del(&req->list);
240                 list_add_tail(&req->list, &done_list);
241         }
242
243         if (!list_empty(&req_list)) {
244                 req = list_entry(req_list.next, struct addr_req, list);
245                 set_timeout(req->timeout);
246         }
247         mutex_unlock(&lock);
248
249         list_for_each_entry_safe(req, temp_req, &done_list, list) {
250                 list_del(&req->list);
251                 req->callback(req->status, &req->src_addr, req->addr,
252                               req->context);
253                 put_client(req->client);
254                 kfree(req);
255         }
256 }
257
258 static int addr_resolve_local(struct sockaddr_in *src_in,
259                               struct sockaddr_in *dst_in,
260                               struct rdma_dev_addr *addr)
261 {
262         struct net_device *dev;
263         u32 src_ip = src_in->sin_addr.s_addr;
264         __be32 dst_ip = dst_in->sin_addr.s_addr;
265         int ret;
266
267         dev = ip_dev_find(dst_ip);
268         if (!dev)
269                 return -EADDRNOTAVAIL;
270
271         if (ZERONET(src_ip)) {
272                 src_in->sin_family = dst_in->sin_family;
273                 src_in->sin_addr.s_addr = dst_ip;
274                 ret = rdma_copy_addr(addr, dev, dev->dev_addr);
275         } else if (LOOPBACK(src_ip)) {
276                 ret = rdma_translate_ip((struct sockaddr *)dst_in, addr);
277                 if (!ret)
278                         memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
279         } else {
280                 ret = rdma_translate_ip((struct sockaddr *)src_in, addr);
281                 if (!ret)
282                         memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
283         }
284
285         dev_put(dev);
286         return ret;
287 }
288
289 int rdma_resolve_ip(struct rdma_addr_client *client,
290                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
291                     struct rdma_dev_addr *addr, int timeout_ms,
292                     void (*callback)(int status, struct sockaddr *src_addr,
293                                      struct rdma_dev_addr *addr, void *context),
294                     void *context)
295 {
296         struct sockaddr_in *src_in, *dst_in;
297         struct addr_req *req;
298         int ret = 0;
299
300         req = kmalloc(sizeof *req, GFP_KERNEL);
301         if (!req)
302                 return -ENOMEM;
303         memset(req, 0, sizeof *req);
304
305         if (src_addr)
306                 memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
307         memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
308         req->addr = addr;
309         req->callback = callback;
310         req->context = context;
311         req->client = client;
312         atomic_inc(&client->refcount);
313
314         src_in = (struct sockaddr_in *) &req->src_addr;
315         dst_in = (struct sockaddr_in *) &req->dst_addr;
316
317         req->status = addr_resolve_local(src_in, dst_in, addr);
318         if (req->status == -EADDRNOTAVAIL)
319                 req->status = addr_resolve_remote(src_in, dst_in, addr);
320
321         switch (req->status) {
322         case 0:
323                 req->timeout = jiffies;
324                 queue_req(req);
325                 break;
326         case -ENODATA:
327                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
328                 queue_req(req);
329                 addr_send_arp(dst_in);
330                 break;
331         default:
332                 ret = req->status;
333                 atomic_dec(&client->refcount);
334                 kfree(req);
335                 break;
336         }
337         return ret;
338 }
339 EXPORT_SYMBOL(rdma_resolve_ip);
340
341 void rdma_addr_cancel(struct rdma_dev_addr *addr)
342 {
343         struct addr_req *req, *temp_req;
344
345         mutex_lock(&lock);
346         list_for_each_entry_safe(req, temp_req, &req_list, list) {
347                 if (req->addr == addr) {
348                         req->status = -ECANCELED;
349                         req->timeout = jiffies;
350                         list_del(&req->list);
351                         list_add(&req->list, &req_list);
352                         set_timeout(req->timeout);
353                         break;
354                 }
355         }
356         mutex_unlock(&lock);
357 }
358 EXPORT_SYMBOL(rdma_addr_cancel);
359
360 static int netevent_callback(struct notifier_block *self, unsigned long event,
361         void *ctx)
362 {
363         if (event == NETEVENT_NEIGH_UPDATE) {
364                 struct neighbour *neigh = ctx;
365
366                 if (neigh->dev->type == ARPHRD_INFINIBAND &&
367                     (neigh->nud_state & NUD_VALID)) {
368                         set_timeout(jiffies);
369                 }
370         }
371         return 0;
372 }
373
374 static struct notifier_block nb = {
375         .notifier_call = netevent_callback
376 };
377
378 static int addr_init(void)
379 {
380         addr_wq = create_singlethread_workqueue("ib_addr_wq");
381         if (!addr_wq)
382                 return -ENOMEM;
383
384         register_netevent_notifier(&nb);
385         return 0;
386 }
387
388 static void addr_cleanup(void)
389 {
390         unregister_netevent_notifier(&nb);
391         destroy_workqueue(addr_wq);
392 }
393
394 module_init(addr_init);
395 module_exit(addr_cleanup);