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Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[deliverable/linux.git] / drivers / infiniband / core / cache.c
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 int ib_get_cached_gid(struct ib_device *device,
62 u8 port_num,
63 int index,
64 union ib_gid *gid)
65 {
66 struct ib_gid_cache *cache;
67 unsigned long flags;
68 int ret = 0;
69
70 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
71 return -EINVAL;
72
73 read_lock_irqsave(&device->cache.lock, flags);
74
75 cache = device->cache.gid_cache[port_num - rdma_start_port(device)];
76
77 if (index < 0 || index >= cache->table_len)
78 ret = -EINVAL;
79 else
80 *gid = cache->table[index];
81
82 read_unlock_irqrestore(&device->cache.lock, flags);
83
84 return ret;
85 }
86 EXPORT_SYMBOL(ib_get_cached_gid);
87
88 int ib_find_cached_gid(struct ib_device *device,
89 const union ib_gid *gid,
90 u8 *port_num,
91 u16 *index)
92 {
93 struct ib_gid_cache *cache;
94 unsigned long flags;
95 int p, i;
96 int ret = -ENOENT;
97
98 *port_num = -1;
99 if (index)
100 *index = -1;
101
102 read_lock_irqsave(&device->cache.lock, flags);
103
104 for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p) {
105 cache = device->cache.gid_cache[p];
106 for (i = 0; i < cache->table_len; ++i) {
107 if (!memcmp(gid, &cache->table[i], sizeof *gid)) {
108 *port_num = p + rdma_start_port(device);
109 if (index)
110 *index = i;
111 ret = 0;
112 goto found;
113 }
114 }
115 }
116 found:
117 read_unlock_irqrestore(&device->cache.lock, flags);
118
119 return ret;
120 }
121 EXPORT_SYMBOL(ib_find_cached_gid);
122
123 int ib_get_cached_pkey(struct ib_device *device,
124 u8 port_num,
125 int index,
126 u16 *pkey)
127 {
128 struct ib_pkey_cache *cache;
129 unsigned long flags;
130 int ret = 0;
131
132 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
133 return -EINVAL;
134
135 read_lock_irqsave(&device->cache.lock, flags);
136
137 cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
138
139 if (index < 0 || index >= cache->table_len)
140 ret = -EINVAL;
141 else
142 *pkey = cache->table[index];
143
144 read_unlock_irqrestore(&device->cache.lock, flags);
145
146 return ret;
147 }
148 EXPORT_SYMBOL(ib_get_cached_pkey);
149
150 int ib_find_cached_pkey(struct ib_device *device,
151 u8 port_num,
152 u16 pkey,
153 u16 *index)
154 {
155 struct ib_pkey_cache *cache;
156 unsigned long flags;
157 int i;
158 int ret = -ENOENT;
159 int partial_ix = -1;
160
161 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
162 return -EINVAL;
163
164 read_lock_irqsave(&device->cache.lock, flags);
165
166 cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
167
168 *index = -1;
169
170 for (i = 0; i < cache->table_len; ++i)
171 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
172 if (cache->table[i] & 0x8000) {
173 *index = i;
174 ret = 0;
175 break;
176 } else
177 partial_ix = i;
178 }
179
180 if (ret && partial_ix >= 0) {
181 *index = partial_ix;
182 ret = 0;
183 }
184
185 read_unlock_irqrestore(&device->cache.lock, flags);
186
187 return ret;
188 }
189 EXPORT_SYMBOL(ib_find_cached_pkey);
190
191 int ib_find_exact_cached_pkey(struct ib_device *device,
192 u8 port_num,
193 u16 pkey,
194 u16 *index)
195 {
196 struct ib_pkey_cache *cache;
197 unsigned long flags;
198 int i;
199 int ret = -ENOENT;
200
201 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
202 return -EINVAL;
203
204 read_lock_irqsave(&device->cache.lock, flags);
205
206 cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
207
208 *index = -1;
209
210 for (i = 0; i < cache->table_len; ++i)
211 if (cache->table[i] == pkey) {
212 *index = i;
213 ret = 0;
214 break;
215 }
216
217 read_unlock_irqrestore(&device->cache.lock, flags);
218
219 return ret;
220 }
221 EXPORT_SYMBOL(ib_find_exact_cached_pkey);
222
223 int ib_get_cached_lmc(struct ib_device *device,
224 u8 port_num,
225 u8 *lmc)
226 {
227 unsigned long flags;
228 int ret = 0;
229
230 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
231 return -EINVAL;
232
233 read_lock_irqsave(&device->cache.lock, flags);
234 *lmc = device->cache.lmc_cache[port_num - rdma_start_port(device)];
235 read_unlock_irqrestore(&device->cache.lock, flags);
236
237 return ret;
238 }
239 EXPORT_SYMBOL(ib_get_cached_lmc);
240
241 static void ib_cache_update(struct ib_device *device,
242 u8 port)
243 {
244 struct ib_port_attr *tprops = NULL;
245 struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache;
246 struct ib_gid_cache *gid_cache = NULL, *old_gid_cache;
247 int i;
248 int ret;
249
250 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
251 if (!tprops)
252 return;
253
254 ret = ib_query_port(device, port, tprops);
255 if (ret) {
256 printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
257 ret, device->name);
258 goto err;
259 }
260
261 pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
262 sizeof *pkey_cache->table, GFP_KERNEL);
263 if (!pkey_cache)
264 goto err;
265
266 pkey_cache->table_len = tprops->pkey_tbl_len;
267
268 gid_cache = kmalloc(sizeof *gid_cache + tprops->gid_tbl_len *
269 sizeof *gid_cache->table, GFP_KERNEL);
270 if (!gid_cache)
271 goto err;
272
273 gid_cache->table_len = tprops->gid_tbl_len;
274
275 for (i = 0; i < pkey_cache->table_len; ++i) {
276 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
277 if (ret) {
278 printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
279 ret, device->name, i);
280 goto err;
281 }
282 }
283
284 for (i = 0; i < gid_cache->table_len; ++i) {
285 ret = ib_query_gid(device, port, i, gid_cache->table + i);
286 if (ret) {
287 printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
288 ret, device->name, i);
289 goto err;
290 }
291 }
292
293 write_lock_irq(&device->cache.lock);
294
295 old_pkey_cache = device->cache.pkey_cache[port - rdma_start_port(device)];
296 old_gid_cache = device->cache.gid_cache [port - rdma_start_port(device)];
297
298 device->cache.pkey_cache[port - rdma_start_port(device)] = pkey_cache;
299 device->cache.gid_cache [port - rdma_start_port(device)] = gid_cache;
300
301 device->cache.lmc_cache[port - rdma_start_port(device)] = tprops->lmc;
302
303 write_unlock_irq(&device->cache.lock);
304
305 kfree(old_pkey_cache);
306 kfree(old_gid_cache);
307 kfree(tprops);
308 return;
309
310 err:
311 kfree(pkey_cache);
312 kfree(gid_cache);
313 kfree(tprops);
314 }
315
316 static void ib_cache_task(struct work_struct *_work)
317 {
318 struct ib_update_work *work =
319 container_of(_work, struct ib_update_work, work);
320
321 ib_cache_update(work->device, work->port_num);
322 kfree(work);
323 }
324
325 static void ib_cache_event(struct ib_event_handler *handler,
326 struct ib_event *event)
327 {
328 struct ib_update_work *work;
329
330 if (event->event == IB_EVENT_PORT_ERR ||
331 event->event == IB_EVENT_PORT_ACTIVE ||
332 event->event == IB_EVENT_LID_CHANGE ||
333 event->event == IB_EVENT_PKEY_CHANGE ||
334 event->event == IB_EVENT_SM_CHANGE ||
335 event->event == IB_EVENT_CLIENT_REREGISTER ||
336 event->event == IB_EVENT_GID_CHANGE) {
337 work = kmalloc(sizeof *work, GFP_ATOMIC);
338 if (work) {
339 INIT_WORK(&work->work, ib_cache_task);
340 work->device = event->device;
341 work->port_num = event->element.port_num;
342 queue_work(ib_wq, &work->work);
343 }
344 }
345 }
346
347 static void ib_cache_setup_one(struct ib_device *device)
348 {
349 int p;
350
351 rwlock_init(&device->cache.lock);
352
353 device->cache.pkey_cache =
354 kmalloc(sizeof *device->cache.pkey_cache *
355 (rdma_end_port(device) - rdma_start_port(device) + 1), GFP_KERNEL);
356 device->cache.gid_cache =
357 kmalloc(sizeof *device->cache.gid_cache *
358 (rdma_end_port(device) - rdma_start_port(device) + 1), GFP_KERNEL);
359
360 device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
361 (rdma_end_port(device) -
362 rdma_start_port(device) + 1),
363 GFP_KERNEL);
364
365 if (!device->cache.pkey_cache || !device->cache.gid_cache ||
366 !device->cache.lmc_cache) {
367 printk(KERN_WARNING "Couldn't allocate cache "
368 "for %s\n", device->name);
369 goto err;
370 }
371
372 for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p) {
373 device->cache.pkey_cache[p] = NULL;
374 device->cache.gid_cache [p] = NULL;
375 ib_cache_update(device, p + rdma_start_port(device));
376 }
377
378 INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
379 device, ib_cache_event);
380 if (ib_register_event_handler(&device->cache.event_handler))
381 goto err_cache;
382
383 return;
384
385 err_cache:
386 for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p) {
387 kfree(device->cache.pkey_cache[p]);
388 kfree(device->cache.gid_cache[p]);
389 }
390
391 err:
392 kfree(device->cache.pkey_cache);
393 kfree(device->cache.gid_cache);
394 kfree(device->cache.lmc_cache);
395 }
396
397 static void ib_cache_cleanup_one(struct ib_device *device)
398 {
399 int p;
400
401 ib_unregister_event_handler(&device->cache.event_handler);
402 flush_workqueue(ib_wq);
403
404 for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p) {
405 kfree(device->cache.pkey_cache[p]);
406 kfree(device->cache.gid_cache[p]);
407 }
408
409 kfree(device->cache.pkey_cache);
410 kfree(device->cache.gid_cache);
411 kfree(device->cache.lmc_cache);
412 }
413
414 static struct ib_client cache_client = {
415 .name = "cache",
416 .add = ib_cache_setup_one,
417 .remove = ib_cache_cleanup_one
418 };
419
420 int __init ib_cache_setup(void)
421 {
422 return ib_register_client(&cache_client);
423 }
424
425 void __exit ib_cache_cleanup(void)
426 {
427 ib_unregister_client(&cache_client);
428 }
Linux kernel - Deliverables
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