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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / infiniband / core / cache.c
blob9353992f9eeadbb336a8b634798079ce57f34ac9
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/module.h>
37 #include <linux/errno.h>
38 #include <linux/slab.h>
39 #include <linux/workqueue.h>
40
41 #include <rdma/ib_cache.h>
42
43 #include "core_priv.h"
44
45 struct ib_pkey_cache {
46 int table_len;
47 u16 table[0];
48 };
49
50 struct ib_gid_cache {
51 int table_len;
52 union ib_gid table[0];
53 };
54
55 struct ib_update_work {
56 struct work_struct work;
57 struct ib_device *device;
58 u8 port_num;
59 };
60
61 static inline int start_port(struct ib_device *device)
62 {
63 return (device->node_type == RDMA_NODE_IB_SWITCH) ? 0 : 1;
64 }
65
66 static inline int end_port(struct ib_device *device)
67 {
68 return (device->node_type == RDMA_NODE_IB_SWITCH) ?
69 0 : device->phys_port_cnt;
70 }
71
72 int ib_get_cached_gid(struct ib_device *device,
73 u8 port_num,
74 int index,
75 union ib_gid *gid)
76 {
77 struct ib_gid_cache *cache;
78 unsigned long flags;
79 int ret = 0;
80
81 if (port_num < start_port(device) || port_num > end_port(device))
82 return -EINVAL;
83
84 read_lock_irqsave(&device->cache.lock, flags);
85
86 cache = device->cache.gid_cache[port_num - start_port(device)];
87
88 if (index < 0 || index >= cache->table_len)
89 ret = -EINVAL;
90 else
91 *gid = cache->table[index];
92
93 read_unlock_irqrestore(&device->cache.lock, flags);
94
95 return ret;
96 }
97 EXPORT_SYMBOL(ib_get_cached_gid);
98
99 int ib_find_cached_gid(struct ib_device *device,
100 union ib_gid *gid,
101 u8 *port_num,
102 u16 *index)
103 {
104 struct ib_gid_cache *cache;
105 unsigned long flags;
106 int p, i;
107 int ret = -ENOENT;
108
109 *port_num = -1;
110 if (index)
111 *index = -1;
112
113 read_lock_irqsave(&device->cache.lock, flags);
114
115 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
116 cache = device->cache.gid_cache[p];
117 for (i = 0; i < cache->table_len; ++i) {
118 if (!memcmp(gid, &cache->table[i], sizeof *gid)) {
119 *port_num = p + start_port(device);
120 if (index)
121 *index = i;
122 ret = 0;
123 goto found;
124 }
125 }
126 }
127 found:
128 read_unlock_irqrestore(&device->cache.lock, flags);
129
130 return ret;
131 }
132 EXPORT_SYMBOL(ib_find_cached_gid);
133
134 int ib_get_cached_pkey(struct ib_device *device,
135 u8 port_num,
136 int index,
137 u16 *pkey)
138 {
139 struct ib_pkey_cache *cache;
140 unsigned long flags;
141 int ret = 0;
142
143 if (port_num < start_port(device) || port_num > end_port(device))
144 return -EINVAL;
145
146 read_lock_irqsave(&device->cache.lock, flags);
147
148 cache = device->cache.pkey_cache[port_num - start_port(device)];
149
150 if (index < 0 || index >= cache->table_len)
151 ret = -EINVAL;
152 else
153 *pkey = cache->table[index];
154
155 read_unlock_irqrestore(&device->cache.lock, flags);
156
157 return ret;
158 }
159 EXPORT_SYMBOL(ib_get_cached_pkey);
160
161 int ib_find_cached_pkey(struct ib_device *device,
162 u8 port_num,
163 u16 pkey,
164 u16 *index)
165 {
166 struct ib_pkey_cache *cache;
167 unsigned long flags;
168 int i;
169 int ret = -ENOENT;
170
171 if (port_num < start_port(device) || port_num > end_port(device))
172 return -EINVAL;
173
174 read_lock_irqsave(&device->cache.lock, flags);
175
176 cache = device->cache.pkey_cache[port_num - start_port(device)];
177
178 *index = -1;
179
180 for (i = 0; i < cache->table_len; ++i)
181 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
182 *index = i;
183 ret = 0;
184 break;
185 }
186
187 read_unlock_irqrestore(&device->cache.lock, flags);
188
189 return ret;
190 }
191 EXPORT_SYMBOL(ib_find_cached_pkey);
192
193 int ib_get_cached_lmc(struct ib_device *device,
194 u8 port_num,
195 u8 *lmc)
196 {
197 unsigned long flags;
198 int ret = 0;
199
200 if (port_num < start_port(device) || port_num > end_port(device))
201 return -EINVAL;
202
203 read_lock_irqsave(&device->cache.lock, flags);
204 *lmc = device->cache.lmc_cache[port_num - start_port(device)];
205 read_unlock_irqrestore(&device->cache.lock, flags);
206
207 return ret;
208 }
209 EXPORT_SYMBOL(ib_get_cached_lmc);
210
211 static void ib_cache_update(struct ib_device *device,
212 u8 port)
213 {
214 struct ib_port_attr *tprops = NULL;
215 struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache;
216 struct ib_gid_cache *gid_cache = NULL, *old_gid_cache;
217 int i;
218 int ret;
219
220 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
221 if (!tprops)
222 return;
223
224 ret = ib_query_port(device, port, tprops);
225 if (ret) {
226 printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
227 ret, device->name);
228 goto err;
229 }
230
231 pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
232 sizeof *pkey_cache->table, GFP_KERNEL);
233 if (!pkey_cache)
234 goto err;
235
236 pkey_cache->table_len = tprops->pkey_tbl_len;
237
238 gid_cache = kmalloc(sizeof *gid_cache + tprops->gid_tbl_len *
239 sizeof *gid_cache->table, GFP_KERNEL);
240 if (!gid_cache)
241 goto err;
242
243 gid_cache->table_len = tprops->gid_tbl_len;
244
245 for (i = 0; i < pkey_cache->table_len; ++i) {
246 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
247 if (ret) {
248 printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
249 ret, device->name, i);
250 goto err;
251 }
252 }
253
254 for (i = 0; i < gid_cache->table_len; ++i) {
255 ret = ib_query_gid(device, port, i, gid_cache->table + i);
256 if (ret) {
257 printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
258 ret, device->name, i);
259 goto err;
260 }
261 }
262
263 write_lock_irq(&device->cache.lock);
264
265 old_pkey_cache = device->cache.pkey_cache[port - start_port(device)];
266 old_gid_cache = device->cache.gid_cache [port - start_port(device)];
267
268 device->cache.pkey_cache[port - start_port(device)] = pkey_cache;
269 device->cache.gid_cache [port - start_port(device)] = gid_cache;
270
271 device->cache.lmc_cache[port - start_port(device)] = tprops->lmc;
272
273 write_unlock_irq(&device->cache.lock);
274
275 kfree(old_pkey_cache);
276 kfree(old_gid_cache);
277 kfree(tprops);
278 return;
279
280 err:
281 kfree(pkey_cache);
282 kfree(gid_cache);
283 kfree(tprops);
284 }
285
286 static void ib_cache_task(struct work_struct *_work)
287 {
288 struct ib_update_work *work =
289 container_of(_work, struct ib_update_work, work);
290
291 ib_cache_update(work->device, work->port_num);
292 kfree(work);
293 }
294
295 static void ib_cache_event(struct ib_event_handler *handler,
296 struct ib_event *event)
297 {
298 struct ib_update_work *work;
299
300 if (event->event == IB_EVENT_PORT_ERR ||
301 event->event == IB_EVENT_PORT_ACTIVE ||
302 event->event == IB_EVENT_LID_CHANGE ||
303 event->event == IB_EVENT_PKEY_CHANGE ||
304 event->event == IB_EVENT_SM_CHANGE ||
305 event->event == IB_EVENT_CLIENT_REREGISTER ||
306 event->event == IB_EVENT_GID_CHANGE) {
307 work = kmalloc(sizeof *work, GFP_ATOMIC);
308 if (work) {
309 INIT_WORK(&work->work, ib_cache_task);
310 work->device = event->device;
311 work->port_num = event->element.port_num;
312 queue_work(ib_wq, &work->work);
313 }
314 }
315 }
316
317 static void ib_cache_setup_one(struct ib_device *device)
318 {
319 int p;
320
321 rwlock_init(&device->cache.lock);
322
323 device->cache.pkey_cache =
324 kmalloc(sizeof *device->cache.pkey_cache *
325 (end_port(device) - start_port(device) + 1), GFP_KERNEL);
326 device->cache.gid_cache =
327 kmalloc(sizeof *device->cache.gid_cache *
328 (end_port(device) - start_port(device) + 1), GFP_KERNEL);
329
330 device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
331 (end_port(device) -
332 start_port(device) + 1),
333 GFP_KERNEL);
334
335 if (!device->cache.pkey_cache || !device->cache.gid_cache ||
336 !device->cache.lmc_cache) {
337 printk(KERN_WARNING "Couldn't allocate cache "
338 "for %s\n", device->name);
339 goto err;
340 }
341
342 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
343 device->cache.pkey_cache[p] = NULL;
344 device->cache.gid_cache [p] = NULL;
345 ib_cache_update(device, p + start_port(device));
346 }
347
348 INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
349 device, ib_cache_event);
350 if (ib_register_event_handler(&device->cache.event_handler))
351 goto err_cache;
352
353 return;
354
355 err_cache:
356 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
357 kfree(device->cache.pkey_cache[p]);
358 kfree(device->cache.gid_cache[p]);
359 }
360
361 err:
362 kfree(device->cache.pkey_cache);
363 kfree(device->cache.gid_cache);
364 kfree(device->cache.lmc_cache);
365 }
366
367 static void ib_cache_cleanup_one(struct ib_device *device)
368 {
369 int p;
370
371 ib_unregister_event_handler(&device->cache.event_handler);
372 flush_workqueue(ib_wq);
373
374 for (p = 0; p <= end_port(device) - start_port(device); ++p) {
375 kfree(device->cache.pkey_cache[p]);
376 kfree(device->cache.gid_cache[p]);
377 }
378
379 kfree(device->cache.pkey_cache);
380 kfree(device->cache.gid_cache);
381 kfree(device->cache.lmc_cache);
382 }
383
384 static struct ib_client cache_client = {
385 .name = "cache",
386 .add = ib_cache_setup_one,
387 .remove = ib_cache_cleanup_one
388 };
389
390 int __init ib_cache_setup(void)
391 {
392 return ib_register_client(&cache_client);
393 }
394
395 void __exit ib_cache_cleanup(void)
396 {
397 ib_unregister_client(&cache_client);
398 }
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