Pull sn-recursive-flags-for-select-builds into release branch
[linux-2.6] / 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  * $Id: cache.c 1349 2004-12-16 21:09:43Z roland $
36  */
37
38 #include <linux/module.h>
39 #include <linux/errno.h>
40 #include <linux/slab.h>
41 #include <linux/sched.h>        /* INIT_WORK, schedule_work(), flush_scheduled_work() */
42
43 #include <rdma/ib_cache.h>
44
45 #include "core_priv.h"
46
47 struct ib_pkey_cache {
48         int             table_len;
49         u16             table[0];
50 };
51
52 struct ib_gid_cache {
53         int             table_len;
54         union ib_gid    table[0];
55 };
56
57 struct ib_update_work {
58         struct work_struct work;
59         struct ib_device  *device;
60         u8                 port_num;
61 };
62
63 static inline int start_port(struct ib_device *device)
64 {
65         return device->node_type == IB_NODE_SWITCH ? 0 : 1;
66 }
67
68 static inline int end_port(struct ib_device *device)
69 {
70         return device->node_type == IB_NODE_SWITCH ? 0 : device->phys_port_cnt;
71 }
72
73 int ib_get_cached_gid(struct ib_device *device,
74                       u8                port_num,
75                       int               index,
76                       union ib_gid     *gid)
77 {
78         struct ib_gid_cache *cache;
79         unsigned long flags;
80         int ret = 0;
81
82         if (port_num < start_port(device) || port_num > end_port(device))
83                 return -EINVAL;
84
85         read_lock_irqsave(&device->cache.lock, flags);
86
87         cache = device->cache.gid_cache[port_num - start_port(device)];
88
89         if (index < 0 || index >= cache->table_len)
90                 ret = -EINVAL;
91         else
92                 *gid = cache->table[index];
93
94         read_unlock_irqrestore(&device->cache.lock, flags);
95
96         return ret;
97 }
98 EXPORT_SYMBOL(ib_get_cached_gid);
99
100 int ib_find_cached_gid(struct ib_device *device,
101                        union ib_gid     *gid,
102                        u8               *port_num,
103                        u16              *index)
104 {
105         struct ib_gid_cache *cache;
106         unsigned long flags;
107         int p, i;
108         int ret = -ENOENT;
109
110         *port_num = -1;
111         if (index)
112                 *index = -1;
113
114         read_lock_irqsave(&device->cache.lock, flags);
115
116         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
117                 cache = device->cache.gid_cache[p];
118                 for (i = 0; i < cache->table_len; ++i) {
119                         if (!memcmp(gid, &cache->table[i], sizeof *gid)) {
120                                 *port_num = p + start_port(device);
121                                 if (index)
122                                         *index = i;
123                                 ret = 0;
124                                 goto found;
125                         }
126                 }
127         }
128 found:
129         read_unlock_irqrestore(&device->cache.lock, flags);
130
131         return ret;
132 }
133 EXPORT_SYMBOL(ib_find_cached_gid);
134
135 int ib_get_cached_pkey(struct ib_device *device,
136                        u8                port_num,
137                        int               index,
138                        u16              *pkey)
139 {
140         struct ib_pkey_cache *cache;
141         unsigned long flags;
142         int ret = 0;
143
144         if (port_num < start_port(device) || port_num > end_port(device))
145                 return -EINVAL;
146
147         read_lock_irqsave(&device->cache.lock, flags);
148
149         cache = device->cache.pkey_cache[port_num - start_port(device)];
150
151         if (index < 0 || index >= cache->table_len)
152                 ret = -EINVAL;
153         else
154                 *pkey = cache->table[index];
155
156         read_unlock_irqrestore(&device->cache.lock, flags);
157
158         return ret;
159 }
160 EXPORT_SYMBOL(ib_get_cached_pkey);
161
162 int ib_find_cached_pkey(struct ib_device *device,
163                         u8                port_num,
164                         u16               pkey,
165                         u16              *index)
166 {
167         struct ib_pkey_cache *cache;
168         unsigned long flags;
169         int i;
170         int ret = -ENOENT;
171
172         if (port_num < start_port(device) || port_num > end_port(device))
173                 return -EINVAL;
174
175         read_lock_irqsave(&device->cache.lock, flags);
176
177         cache = device->cache.pkey_cache[port_num - start_port(device)];
178
179         *index = -1;
180
181         for (i = 0; i < cache->table_len; ++i)
182                 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
183                         *index = i;
184                         ret = 0;
185                         break;
186                 }
187
188         read_unlock_irqrestore(&device->cache.lock, flags);
189
190         return ret;
191 }
192 EXPORT_SYMBOL(ib_find_cached_pkey);
193
194 static void ib_cache_update(struct ib_device *device,
195                             u8                port)
196 {
197         struct ib_port_attr       *tprops = NULL;
198         struct ib_pkey_cache      *pkey_cache = NULL, *old_pkey_cache;
199         struct ib_gid_cache       *gid_cache = NULL, *old_gid_cache;
200         int                        i;
201         int                        ret;
202
203         tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
204         if (!tprops)
205                 return;
206
207         ret = ib_query_port(device, port, tprops);
208         if (ret) {
209                 printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
210                        ret, device->name);
211                 goto err;
212         }
213
214         pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
215                              sizeof *pkey_cache->table, GFP_KERNEL);
216         if (!pkey_cache)
217                 goto err;
218
219         pkey_cache->table_len = tprops->pkey_tbl_len;
220
221         gid_cache = kmalloc(sizeof *gid_cache + tprops->gid_tbl_len *
222                             sizeof *gid_cache->table, GFP_KERNEL);
223         if (!gid_cache)
224                 goto err;
225
226         gid_cache->table_len = tprops->gid_tbl_len;
227
228         for (i = 0; i < pkey_cache->table_len; ++i) {
229                 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
230                 if (ret) {
231                         printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
232                                ret, device->name, i);
233                         goto err;
234                 }
235         }
236
237         for (i = 0; i < gid_cache->table_len; ++i) {
238                 ret = ib_query_gid(device, port, i, gid_cache->table + i);
239                 if (ret) {
240                         printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
241                                ret, device->name, i);
242                         goto err;
243                 }
244         }
245
246         write_lock_irq(&device->cache.lock);
247
248         old_pkey_cache = device->cache.pkey_cache[port - start_port(device)];
249         old_gid_cache  = device->cache.gid_cache [port - start_port(device)];
250
251         device->cache.pkey_cache[port - start_port(device)] = pkey_cache;
252         device->cache.gid_cache [port - start_port(device)] = gid_cache;
253
254         write_unlock_irq(&device->cache.lock);
255
256         kfree(old_pkey_cache);
257         kfree(old_gid_cache);
258         kfree(tprops);
259         return;
260
261 err:
262         kfree(pkey_cache);
263         kfree(gid_cache);
264         kfree(tprops);
265 }
266
267 static void ib_cache_task(void *work_ptr)
268 {
269         struct ib_update_work *work = work_ptr;
270
271         ib_cache_update(work->device, work->port_num);
272         kfree(work);
273 }
274
275 static void ib_cache_event(struct ib_event_handler *handler,
276                            struct ib_event *event)
277 {
278         struct ib_update_work *work;
279
280         if (event->event == IB_EVENT_PORT_ERR    ||
281             event->event == IB_EVENT_PORT_ACTIVE ||
282             event->event == IB_EVENT_LID_CHANGE  ||
283             event->event == IB_EVENT_PKEY_CHANGE ||
284             event->event == IB_EVENT_SM_CHANGE) {
285                 work = kmalloc(sizeof *work, GFP_ATOMIC);
286                 if (work) {
287                         INIT_WORK(&work->work, ib_cache_task, work);
288                         work->device   = event->device;
289                         work->port_num = event->element.port_num;
290                         schedule_work(&work->work);
291                 }
292         }
293 }
294
295 static void ib_cache_setup_one(struct ib_device *device)
296 {
297         int p;
298
299         rwlock_init(&device->cache.lock);
300
301         device->cache.pkey_cache =
302                 kmalloc(sizeof *device->cache.pkey_cache *
303                         (end_port(device) - start_port(device) + 1), GFP_KERNEL);
304         device->cache.gid_cache =
305                 kmalloc(sizeof *device->cache.pkey_cache *
306                         (end_port(device) - start_port(device) + 1), GFP_KERNEL);
307
308         if (!device->cache.pkey_cache || !device->cache.gid_cache) {
309                 printk(KERN_WARNING "Couldn't allocate cache "
310                        "for %s\n", device->name);
311                 goto err;
312         }
313
314         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
315                 device->cache.pkey_cache[p] = NULL;
316                 device->cache.gid_cache [p] = NULL;
317                 ib_cache_update(device, p + start_port(device));
318         }
319
320         INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
321                               device, ib_cache_event);
322         if (ib_register_event_handler(&device->cache.event_handler))
323                 goto err_cache;
324
325         return;
326
327 err_cache:
328         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
329                 kfree(device->cache.pkey_cache[p]);
330                 kfree(device->cache.gid_cache[p]);
331         }
332
333 err:
334         kfree(device->cache.pkey_cache);
335         kfree(device->cache.gid_cache);
336 }
337
338 static void ib_cache_cleanup_one(struct ib_device *device)
339 {
340         int p;
341
342         ib_unregister_event_handler(&device->cache.event_handler);
343         flush_scheduled_work();
344
345         for (p = 0; p <= end_port(device) - start_port(device); ++p) {
346                 kfree(device->cache.pkey_cache[p]);
347                 kfree(device->cache.gid_cache[p]);
348         }
349
350         kfree(device->cache.pkey_cache);
351         kfree(device->cache.gid_cache);
352 }
353
354 static struct ib_client cache_client = {
355         .name   = "cache",
356         .add    = ib_cache_setup_one,
357         .remove = ib_cache_cleanup_one
358 };
359
360 int __init ib_cache_setup(void)
361 {
362         return ib_register_client(&cache_client);
363 }
364
365 void __exit ib_cache_cleanup(void)
366 {
367         ib_unregister_client(&cache_client);
368 }