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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / infiniband / core / cache.c
blob89bebeada38b9b5f6a09d9dd896c8047fa57d7ad
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 #include <linux/netdevice.h>
41 #include <net/addrconf.h>
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_update_work {
53 struct work_struct work;
54 struct ib_device *device;
55 u8 port_num;
56 };
57
58 union ib_gid zgid;
59 EXPORT_SYMBOL(zgid);
60
61 static const struct ib_gid_attr zattr;
62
63 enum gid_attr_find_mask {
64 GID_ATTR_FIND_MASK_GID = 1UL << 0,
65 GID_ATTR_FIND_MASK_NETDEV = 1UL << 1,
66 GID_ATTR_FIND_MASK_DEFAULT = 1UL << 2,
67 };
68
69 enum gid_table_entry_props {
70 GID_TABLE_ENTRY_INVALID = 1UL << 0,
71 GID_TABLE_ENTRY_DEFAULT = 1UL << 1,
72 };
73
74 enum gid_table_write_action {
75 GID_TABLE_WRITE_ACTION_ADD,
76 GID_TABLE_WRITE_ACTION_DEL,
77 /* MODIFY only updates the GID table. Currently only used by
78 * ib_cache_update.
79 */
80 GID_TABLE_WRITE_ACTION_MODIFY
81 };
82
83 struct ib_gid_table_entry {
84 /* This lock protects an entry from being
85 * read and written simultaneously.
86 */
87 rwlock_t lock;
88 unsigned long props;
89 union ib_gid gid;
90 struct ib_gid_attr attr;
91 void *context;
92 };
93
94 struct ib_gid_table {
95 int sz;
96 /* In RoCE, adding a GID to the table requires:
97 * (a) Find if this GID is already exists.
98 * (b) Find a free space.
99 * (c) Write the new GID
100 *
101 * Delete requires different set of operations:
102 * (a) Find the GID
103 * (b) Delete it.
104 *
105 * Add/delete should be carried out atomically.
106 * This is done by locking this mutex from multiple
107 * writers. We don't need this lock for IB, as the MAD
108 * layer replaces all entries. All data_vec entries
109 * are locked by this lock.
110 **/
111 struct mutex lock;
112 struct ib_gid_table_entry *data_vec;
113 };
114
115 static int write_gid(struct ib_device *ib_dev, u8 port,
116 struct ib_gid_table *table, int ix,
117 const union ib_gid *gid,
118 const struct ib_gid_attr *attr,
119 enum gid_table_write_action action,
120 bool default_gid)
121 {
122 int ret = 0;
123 struct net_device *old_net_dev;
124 unsigned long flags;
125
126 /* in rdma_cap_roce_gid_table, this funciton should be protected by a
127 * sleep-able lock.
128 */
129 write_lock_irqsave(&table->data_vec[ix].lock, flags);
130
131 if (rdma_cap_roce_gid_table(ib_dev, port)) {
132 table->data_vec[ix].props |= GID_TABLE_ENTRY_INVALID;
133 write_unlock_irqrestore(&table->data_vec[ix].lock, flags);
134 /* GID_TABLE_WRITE_ACTION_MODIFY currently isn't supported by
135 * RoCE providers and thus only updates the cache.
136 */
137 if (action == GID_TABLE_WRITE_ACTION_ADD)
138 ret = ib_dev->add_gid(ib_dev, port, ix, gid, attr,
139 &table->data_vec[ix].context);
140 else if (action == GID_TABLE_WRITE_ACTION_DEL)
141 ret = ib_dev->del_gid(ib_dev, port, ix,
142 &table->data_vec[ix].context);
143 write_lock_irqsave(&table->data_vec[ix].lock, flags);
144 }
145
146 old_net_dev = table->data_vec[ix].attr.ndev;
147 if (old_net_dev && old_net_dev != attr->ndev)
148 dev_put(old_net_dev);
149 /* if modify_gid failed, just delete the old gid */
150 if (ret || action == GID_TABLE_WRITE_ACTION_DEL) {
151 gid = &zgid;
152 attr = &zattr;
153 table->data_vec[ix].context = NULL;
154 }
155 if (default_gid)
156 table->data_vec[ix].props |= GID_TABLE_ENTRY_DEFAULT;
157 memcpy(&table->data_vec[ix].gid, gid, sizeof(*gid));
158 memcpy(&table->data_vec[ix].attr, attr, sizeof(*attr));
159 if (table->data_vec[ix].attr.ndev &&
160 table->data_vec[ix].attr.ndev != old_net_dev)
161 dev_hold(table->data_vec[ix].attr.ndev);
162
163 table->data_vec[ix].props &= ~GID_TABLE_ENTRY_INVALID;
164
165 write_unlock_irqrestore(&table->data_vec[ix].lock, flags);
166
167 if (!ret && rdma_cap_roce_gid_table(ib_dev, port)) {
168 struct ib_event event;
169
170 event.device = ib_dev;
171 event.element.port_num = port;
172 event.event = IB_EVENT_GID_CHANGE;
173
174 ib_dispatch_event(&event);
175 }
176 return ret;
177 }
178
179 static int add_gid(struct ib_device *ib_dev, u8 port,
180 struct ib_gid_table *table, int ix,
181 const union ib_gid *gid,
182 const struct ib_gid_attr *attr,
183 bool default_gid) {
184 return write_gid(ib_dev, port, table, ix, gid, attr,
185 GID_TABLE_WRITE_ACTION_ADD, default_gid);
186 }
187
188 static int modify_gid(struct ib_device *ib_dev, u8 port,
189 struct ib_gid_table *table, int ix,
190 const union ib_gid *gid,
191 const struct ib_gid_attr *attr,
192 bool default_gid) {
193 return write_gid(ib_dev, port, table, ix, gid, attr,
194 GID_TABLE_WRITE_ACTION_MODIFY, default_gid);
195 }
196
197 static int del_gid(struct ib_device *ib_dev, u8 port,
198 struct ib_gid_table *table, int ix,
199 bool default_gid) {
200 return write_gid(ib_dev, port, table, ix, &zgid, &zattr,
201 GID_TABLE_WRITE_ACTION_DEL, default_gid);
202 }
203
204 static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
205 const struct ib_gid_attr *val, bool default_gid,
206 unsigned long mask)
207 {
208 int i;
209
210 for (i = 0; i < table->sz; i++) {
211 unsigned long flags;
212 struct ib_gid_attr *attr = &table->data_vec[i].attr;
213
214 read_lock_irqsave(&table->data_vec[i].lock, flags);
215
216 if (table->data_vec[i].props & GID_TABLE_ENTRY_INVALID)
217 goto next;
218
219 if (mask & GID_ATTR_FIND_MASK_GID &&
220 memcmp(gid, &table->data_vec[i].gid, sizeof(*gid)))
221 goto next;
222
223 if (mask & GID_ATTR_FIND_MASK_NETDEV &&
224 attr->ndev != val->ndev)
225 goto next;
226
227 if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
228 !!(table->data_vec[i].props & GID_TABLE_ENTRY_DEFAULT) !=
229 default_gid)
230 goto next;
231
232 read_unlock_irqrestore(&table->data_vec[i].lock, flags);
233 return i;
234 next:
235 read_unlock_irqrestore(&table->data_vec[i].lock, flags);
236 }
237
238 return -1;
239 }
240
241 static void make_default_gid(struct net_device *dev, union ib_gid *gid)
242 {
243 gid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
244 addrconf_ifid_eui48(&gid->raw[8], dev);
245 }
246
247 int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
248 union ib_gid *gid, struct ib_gid_attr *attr)
249 {
250 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
251 struct ib_gid_table *table;
252 int ix;
253 int ret = 0;
254 struct net_device *idev;
255
256 table = ports_table[port - rdma_start_port(ib_dev)];
257
258 if (!memcmp(gid, &zgid, sizeof(*gid)))
259 return -EINVAL;
260
261 if (ib_dev->get_netdev) {
262 idev = ib_dev->get_netdev(ib_dev, port);
263 if (idev && attr->ndev != idev) {
264 union ib_gid default_gid;
265
266 /* Adding default GIDs in not permitted */
267 make_default_gid(idev, &default_gid);
268 if (!memcmp(gid, &default_gid, sizeof(*gid))) {
269 dev_put(idev);
270 return -EPERM;
271 }
272 }
273 if (idev)
274 dev_put(idev);
275 }
276
277 mutex_lock(&table->lock);
278
279 ix = find_gid(table, gid, attr, false, GID_ATTR_FIND_MASK_GID |
280 GID_ATTR_FIND_MASK_NETDEV);
281 if (ix >= 0)
282 goto out_unlock;
283
284 ix = find_gid(table, &zgid, NULL, false, GID_ATTR_FIND_MASK_GID |
285 GID_ATTR_FIND_MASK_DEFAULT);
286 if (ix < 0) {
287 ret = -ENOSPC;
288 goto out_unlock;
289 }
290
291 add_gid(ib_dev, port, table, ix, gid, attr, false);
292
293 out_unlock:
294 mutex_unlock(&table->lock);
295 return ret;
296 }
297
298 int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
299 union ib_gid *gid, struct ib_gid_attr *attr)
300 {
301 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
302 struct ib_gid_table *table;
303 int ix;
304
305 table = ports_table[port - rdma_start_port(ib_dev)];
306
307 mutex_lock(&table->lock);
308
309 ix = find_gid(table, gid, attr, false,
310 GID_ATTR_FIND_MASK_GID |
311 GID_ATTR_FIND_MASK_NETDEV |
312 GID_ATTR_FIND_MASK_DEFAULT);
313 if (ix < 0)
314 goto out_unlock;
315
316 del_gid(ib_dev, port, table, ix, false);
317
318 out_unlock:
319 mutex_unlock(&table->lock);
320 return 0;
321 }
322
323 int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
324 struct net_device *ndev)
325 {
326 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
327 struct ib_gid_table *table;
328 int ix;
329
330 table = ports_table[port - rdma_start_port(ib_dev)];
331
332 mutex_lock(&table->lock);
333
334 for (ix = 0; ix < table->sz; ix++)
335 if (table->data_vec[ix].attr.ndev == ndev)
336 del_gid(ib_dev, port, table, ix, false);
337
338 mutex_unlock(&table->lock);
339 return 0;
340 }
341
342 static int __ib_cache_gid_get(struct ib_device *ib_dev, u8 port, int index,
343 union ib_gid *gid, struct ib_gid_attr *attr)
344 {
345 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
346 struct ib_gid_table *table;
347 unsigned long flags;
348
349 table = ports_table[port - rdma_start_port(ib_dev)];
350
351 if (index < 0 || index >= table->sz)
352 return -EINVAL;
353
354 read_lock_irqsave(&table->data_vec[index].lock, flags);
355 if (table->data_vec[index].props & GID_TABLE_ENTRY_INVALID) {
356 read_unlock_irqrestore(&table->data_vec[index].lock, flags);
357 return -EAGAIN;
358 }
359
360 memcpy(gid, &table->data_vec[index].gid, sizeof(*gid));
361 if (attr) {
362 memcpy(attr, &table->data_vec[index].attr, sizeof(*attr));
363 if (attr->ndev)
364 dev_hold(attr->ndev);
365 }
366
367 read_unlock_irqrestore(&table->data_vec[index].lock, flags);
368 return 0;
369 }
370
371 static int _ib_cache_gid_table_find(struct ib_device *ib_dev,
372 const union ib_gid *gid,
373 const struct ib_gid_attr *val,
374 unsigned long mask,
375 u8 *port, u16 *index)
376 {
377 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
378 struct ib_gid_table *table;
379 u8 p;
380 int local_index;
381
382 for (p = 0; p < ib_dev->phys_port_cnt; p++) {
383 table = ports_table[p];
384 local_index = find_gid(table, gid, val, false, mask);
385 if (local_index >= 0) {
386 if (index)
387 *index = local_index;
388 if (port)
389 *port = p + rdma_start_port(ib_dev);
390 return 0;
391 }
392 }
393
394 return -ENOENT;
395 }
396
397 static int ib_cache_gid_find(struct ib_device *ib_dev,
398 const union ib_gid *gid,
399 struct net_device *ndev, u8 *port,
400 u16 *index)
401 {
402 unsigned long mask = GID_ATTR_FIND_MASK_GID;
403 struct ib_gid_attr gid_attr_val = {.ndev = ndev};
404
405 if (ndev)
406 mask |= GID_ATTR_FIND_MASK_NETDEV;
407
408 return _ib_cache_gid_table_find(ib_dev, gid, &gid_attr_val,
409 mask, port, index);
410 }
411
412 int ib_find_cached_gid_by_port(struct ib_device *ib_dev,
413 const union ib_gid *gid,
414 u8 port, struct net_device *ndev,
415 u16 *index)
416 {
417 int local_index;
418 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
419 struct ib_gid_table *table;
420 unsigned long mask = GID_ATTR_FIND_MASK_GID;
421 struct ib_gid_attr val = {.ndev = ndev};
422
423 if (port < rdma_start_port(ib_dev) ||
424 port > rdma_end_port(ib_dev))
425 return -ENOENT;
426
427 table = ports_table[port - rdma_start_port(ib_dev)];
428
429 if (ndev)
430 mask |= GID_ATTR_FIND_MASK_NETDEV;
431
432 local_index = find_gid(table, gid, &val, false, mask);
433 if (local_index >= 0) {
434 if (index)
435 *index = local_index;
436 return 0;
437 }
438
439 return -ENOENT;
440 }
441 EXPORT_SYMBOL(ib_find_cached_gid_by_port);
442
443 /**
444 * ib_find_gid_by_filter - Returns the GID table index where a specified
445 * GID value occurs
446 * @device: The device to query.
447 * @gid: The GID value to search for.
448 * @port_num: The port number of the device where the GID value could be
449 * searched.
450 * @filter: The filter function is executed on any matching GID in the table.
451 * If the filter function returns true, the corresponding index is returned,
452 * otherwise, we continue searching the GID table. It's guaranteed that
453 * while filter is executed, ndev field is valid and the structure won't
454 * change. filter is executed in an atomic context. filter must not be NULL.
455 * @index: The index into the cached GID table where the GID was found. This
456 * parameter may be NULL.
457 *
458 * ib_cache_gid_find_by_filter() searches for the specified GID value
459 * of which the filter function returns true in the port's GID table.
460 * This function is only supported on RoCE ports.
461 *
462 */
463 static int ib_cache_gid_find_by_filter(struct ib_device *ib_dev,
464 const union ib_gid *gid,
465 u8 port,
466 bool (*filter)(const union ib_gid *,
467 const struct ib_gid_attr *,
468 void *),
469 void *context,
470 u16 *index)
471 {
472 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
473 struct ib_gid_table *table;
474 unsigned int i;
475 bool found = false;
476
477 if (!ports_table)
478 return -EOPNOTSUPP;
479
480 if (port < rdma_start_port(ib_dev) ||
481 port > rdma_end_port(ib_dev) ||
482 !rdma_protocol_roce(ib_dev, port))
483 return -EPROTONOSUPPORT;
484
485 table = ports_table[port - rdma_start_port(ib_dev)];
486
487 for (i = 0; i < table->sz; i++) {
488 struct ib_gid_attr attr;
489 unsigned long flags;
490
491 read_lock_irqsave(&table->data_vec[i].lock, flags);
492 if (table->data_vec[i].props & GID_TABLE_ENTRY_INVALID)
493 goto next;
494
495 if (memcmp(gid, &table->data_vec[i].gid, sizeof(*gid)))
496 goto next;
497
498 memcpy(&attr, &table->data_vec[i].attr, sizeof(attr));
499
500 if (filter(gid, &attr, context))
501 found = true;
502
503 next:
504 read_unlock_irqrestore(&table->data_vec[i].lock, flags);
505
506 if (found)
507 break;
508 }
509
510 if (!found)
511 return -ENOENT;
512
513 if (index)
514 *index = i;
515 return 0;
516 }
517
518 static struct ib_gid_table *alloc_gid_table(int sz)
519 {
520 unsigned int i;
521 struct ib_gid_table *table =
522 kzalloc(sizeof(struct ib_gid_table), GFP_KERNEL);
523 if (!table)
524 return NULL;
525
526 table->data_vec = kcalloc(sz, sizeof(*table->data_vec), GFP_KERNEL);
527 if (!table->data_vec)
528 goto err_free_table;
529
530 mutex_init(&table->lock);
531
532 table->sz = sz;
533
534 for (i = 0; i < sz; i++)
535 rwlock_init(&table->data_vec[i].lock);
536
537 return table;
538
539 err_free_table:
540 kfree(table);
541 return NULL;
542 }
543
544 static void release_gid_table(struct ib_gid_table *table)
545 {
546 if (table) {
547 kfree(table->data_vec);
548 kfree(table);
549 }
550 }
551
552 static void cleanup_gid_table_port(struct ib_device *ib_dev, u8 port,
553 struct ib_gid_table *table)
554 {
555 int i;
556
557 if (!table)
558 return;
559
560 for (i = 0; i < table->sz; ++i) {
561 if (memcmp(&table->data_vec[i].gid, &zgid,
562 sizeof(table->data_vec[i].gid)))
563 del_gid(ib_dev, port, table, i,
564 table->data_vec[i].props &
565 GID_ATTR_FIND_MASK_DEFAULT);
566 }
567 }
568
569 void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
570 struct net_device *ndev,
571 enum ib_cache_gid_default_mode mode)
572 {
573 struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
574 union ib_gid gid;
575 struct ib_gid_attr gid_attr;
576 struct ib_gid_table *table;
577 int ix;
578 union ib_gid current_gid;
579 struct ib_gid_attr current_gid_attr = {};
580
581 table = ports_table[port - rdma_start_port(ib_dev)];
582
583 make_default_gid(ndev, &gid);
584 memset(&gid_attr, 0, sizeof(gid_attr));
585 gid_attr.ndev = ndev;
586
587 mutex_lock(&table->lock);
588 ix = find_gid(table, NULL, NULL, true, GID_ATTR_FIND_MASK_DEFAULT);
589
590 /* Coudn't find default GID location */
591 WARN_ON(ix < 0);
592
593 if (!__ib_cache_gid_get(ib_dev, port, ix,
594 &current_gid, &current_gid_attr) &&
595 mode == IB_CACHE_GID_DEFAULT_MODE_SET &&
596 !memcmp(&gid, &current_gid, sizeof(gid)) &&
597 !memcmp(&gid_attr, &current_gid_attr, sizeof(gid_attr)))
598 goto unlock;
599
600 if ((memcmp(&current_gid, &zgid, sizeof(current_gid)) ||
601 memcmp(&current_gid_attr, &zattr,
602 sizeof(current_gid_attr))) &&
603 del_gid(ib_dev, port, table, ix, true)) {
604 pr_warn("ib_cache_gid: can't delete index %d for default gid %pI6\n",
605 ix, gid.raw);
606 goto unlock;
607 }
608
609 if (mode == IB_CACHE_GID_DEFAULT_MODE_SET)
610 if (add_gid(ib_dev, port, table, ix, &gid, &gid_attr, true))
611 pr_warn("ib_cache_gid: unable to add default gid %pI6\n",
612 gid.raw);
613
614 unlock:
615 if (current_gid_attr.ndev)
616 dev_put(current_gid_attr.ndev);
617 mutex_unlock(&table->lock);
618 }
619
620 static int gid_table_reserve_default(struct ib_device *ib_dev, u8 port,
621 struct ib_gid_table *table)
622 {
623 if (rdma_protocol_roce(ib_dev, port)) {
624 struct ib_gid_table_entry *entry = &table->data_vec[0];
625
626 entry->props |= GID_TABLE_ENTRY_DEFAULT;
627 }
628
629 return 0;
630 }
631
632 static int _gid_table_setup_one(struct ib_device *ib_dev)
633 {
634 u8 port;
635 struct ib_gid_table **table;
636 int err = 0;
637
638 table = kcalloc(ib_dev->phys_port_cnt, sizeof(*table), GFP_KERNEL);
639
640 if (!table) {
641 pr_warn("failed to allocate ib gid cache for %s\n",
642 ib_dev->name);
643 return -ENOMEM;
644 }
645
646 for (port = 0; port < ib_dev->phys_port_cnt; port++) {
647 u8 rdma_port = port + rdma_start_port(ib_dev);
648
649 table[port] =
650 alloc_gid_table(
651 ib_dev->port_immutable[rdma_port].gid_tbl_len);
652 if (!table[port]) {
653 err = -ENOMEM;
654 goto rollback_table_setup;
655 }
656
657 err = gid_table_reserve_default(ib_dev,
658 port + rdma_start_port(ib_dev),
659 table[port]);
660 if (err)
661 goto rollback_table_setup;
662 }
663
664 ib_dev->cache.gid_cache = table;
665 return 0;
666
667 rollback_table_setup:
668 for (port = 0; port < ib_dev->phys_port_cnt; port++) {
669 cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
670 table[port]);
671 release_gid_table(table[port]);
672 }
673
674 kfree(table);
675 return err;
676 }
677
678 static void gid_table_release_one(struct ib_device *ib_dev)
679 {
680 struct ib_gid_table **table = ib_dev->cache.gid_cache;
681 u8 port;
682
683 if (!table)
684 return;
685
686 for (port = 0; port < ib_dev->phys_port_cnt; port++)
687 release_gid_table(table[port]);
688
689 kfree(table);
690 ib_dev->cache.gid_cache = NULL;
691 }
692
693 static void gid_table_cleanup_one(struct ib_device *ib_dev)
694 {
695 struct ib_gid_table **table = ib_dev->cache.gid_cache;
696 u8 port;
697
698 if (!table)
699 return;
700
701 for (port = 0; port < ib_dev->phys_port_cnt; port++)
702 cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
703 table[port]);
704 }
705
706 static int gid_table_setup_one(struct ib_device *ib_dev)
707 {
708 int err;
709
710 err = _gid_table_setup_one(ib_dev);
711
712 if (err)
713 return err;
714
715 err = roce_rescan_device(ib_dev);
716
717 if (err) {
718 gid_table_cleanup_one(ib_dev);
719 gid_table_release_one(ib_dev);
720 }
721
722 return err;
723 }
724
725 int ib_get_cached_gid(struct ib_device *device,
726 u8 port_num,
727 int index,
728 union ib_gid *gid,
729 struct ib_gid_attr *gid_attr)
730 {
731 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
732 return -EINVAL;
733
734 return __ib_cache_gid_get(device, port_num, index, gid, gid_attr);
735 }
736 EXPORT_SYMBOL(ib_get_cached_gid);
737
738 int ib_find_cached_gid(struct ib_device *device,
739 const union ib_gid *gid,
740 struct net_device *ndev,
741 u8 *port_num,
742 u16 *index)
743 {
744 return ib_cache_gid_find(device, gid, ndev, port_num, index);
745 }
746 EXPORT_SYMBOL(ib_find_cached_gid);
747
748 int ib_find_gid_by_filter(struct ib_device *device,
749 const union ib_gid *gid,
750 u8 port_num,
751 bool (*filter)(const union ib_gid *gid,
752 const struct ib_gid_attr *,
753 void *),
754 void *context, u16 *index)
755 {
756 /* Only RoCE GID table supports filter function */
757 if (!rdma_cap_roce_gid_table(device, port_num) && filter)
758 return -EPROTONOSUPPORT;
759
760 return ib_cache_gid_find_by_filter(device, gid,
761 port_num, filter,
762 context, index);
763 }
764 EXPORT_SYMBOL(ib_find_gid_by_filter);
765
766 int ib_get_cached_pkey(struct ib_device *device,
767 u8 port_num,
768 int index,
769 u16 *pkey)
770 {
771 struct ib_pkey_cache *cache;
772 unsigned long flags;
773 int ret = 0;
774
775 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
776 return -EINVAL;
777
778 read_lock_irqsave(&device->cache.lock, flags);
779
780 cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
781
782 if (index < 0 || index >= cache->table_len)
783 ret = -EINVAL;
784 else
785 *pkey = cache->table[index];
786
787 read_unlock_irqrestore(&device->cache.lock, flags);
788
789 return ret;
790 }
791 EXPORT_SYMBOL(ib_get_cached_pkey);
792
793 int ib_find_cached_pkey(struct ib_device *device,
794 u8 port_num,
795 u16 pkey,
796 u16 *index)
797 {
798 struct ib_pkey_cache *cache;
799 unsigned long flags;
800 int i;
801 int ret = -ENOENT;
802 int partial_ix = -1;
803
804 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
805 return -EINVAL;
806
807 read_lock_irqsave(&device->cache.lock, flags);
808
809 cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
810
811 *index = -1;
812
813 for (i = 0; i < cache->table_len; ++i)
814 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
815 if (cache->table[i] & 0x8000) {
816 *index = i;
817 ret = 0;
818 break;
819 } else
820 partial_ix = i;
821 }
822
823 if (ret && partial_ix >= 0) {
824 *index = partial_ix;
825 ret = 0;
826 }
827
828 read_unlock_irqrestore(&device->cache.lock, flags);
829
830 return ret;
831 }
832 EXPORT_SYMBOL(ib_find_cached_pkey);
833
834 int ib_find_exact_cached_pkey(struct ib_device *device,
835 u8 port_num,
836 u16 pkey,
837 u16 *index)
838 {
839 struct ib_pkey_cache *cache;
840 unsigned long flags;
841 int i;
842 int ret = -ENOENT;
843
844 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
845 return -EINVAL;
846
847 read_lock_irqsave(&device->cache.lock, flags);
848
849 cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];
850
851 *index = -1;
852
853 for (i = 0; i < cache->table_len; ++i)
854 if (cache->table[i] == pkey) {
855 *index = i;
856 ret = 0;
857 break;
858 }
859
860 read_unlock_irqrestore(&device->cache.lock, flags);
861
862 return ret;
863 }
864 EXPORT_SYMBOL(ib_find_exact_cached_pkey);
865
866 int ib_get_cached_lmc(struct ib_device *device,
867 u8 port_num,
868 u8 *lmc)
869 {
870 unsigned long flags;
871 int ret = 0;
872
873 if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
874 return -EINVAL;
875
876 read_lock_irqsave(&device->cache.lock, flags);
877 *lmc = device->cache.lmc_cache[port_num - rdma_start_port(device)];
878 read_unlock_irqrestore(&device->cache.lock, flags);
879
880 return ret;
881 }
882 EXPORT_SYMBOL(ib_get_cached_lmc);
883
884 static void ib_cache_update(struct ib_device *device,
885 u8 port)
886 {
887 struct ib_port_attr *tprops = NULL;
888 struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache;
889 struct ib_gid_cache {
890 int table_len;
891 union ib_gid table[0];
892 } *gid_cache = NULL;
893 int i;
894 int ret;
895 struct ib_gid_table *table;
896 struct ib_gid_table **ports_table = device->cache.gid_cache;
897 bool use_roce_gid_table =
898 rdma_cap_roce_gid_table(device, port);
899
900 if (port < rdma_start_port(device) || port > rdma_end_port(device))
901 return;
902
903 table = ports_table[port - rdma_start_port(device)];
904
905 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
906 if (!tprops)
907 return;
908
909 ret = ib_query_port(device, port, tprops);
910 if (ret) {
911 printk(KERN_WARNING "ib_query_port failed (%d) for %s\n",
912 ret, device->name);
913 goto err;
914 }
915
916 pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
917 sizeof *pkey_cache->table, GFP_KERNEL);
918 if (!pkey_cache)
919 goto err;
920
921 pkey_cache->table_len = tprops->pkey_tbl_len;
922
923 if (!use_roce_gid_table) {
924 gid_cache = kmalloc(sizeof(*gid_cache) + tprops->gid_tbl_len *
925 sizeof(*gid_cache->table), GFP_KERNEL);
926 if (!gid_cache)
927 goto err;
928
929 gid_cache->table_len = tprops->gid_tbl_len;
930 }
931
932 for (i = 0; i < pkey_cache->table_len; ++i) {
933 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
934 if (ret) {
935 printk(KERN_WARNING "ib_query_pkey failed (%d) for %s (index %d)\n",
936 ret, device->name, i);
937 goto err;
938 }
939 }
940
941 if (!use_roce_gid_table) {
942 for (i = 0; i < gid_cache->table_len; ++i) {
943 ret = ib_query_gid(device, port, i,
944 gid_cache->table + i, NULL);
945 if (ret) {
946 printk(KERN_WARNING "ib_query_gid failed (%d) for %s (index %d)\n",
947 ret, device->name, i);
948 goto err;
949 }
950 }
951 }
952
953 write_lock_irq(&device->cache.lock);
954
955 old_pkey_cache = device->cache.pkey_cache[port - rdma_start_port(device)];
956
957 device->cache.pkey_cache[port - rdma_start_port(device)] = pkey_cache;
958 if (!use_roce_gid_table) {
959 for (i = 0; i < gid_cache->table_len; i++) {
960 modify_gid(device, port, table, i, gid_cache->table + i,
961 &zattr, false);
962 }
963 }
964
965 device->cache.lmc_cache[port - rdma_start_port(device)] = tprops->lmc;
966
967 write_unlock_irq(&device->cache.lock);
968
969 kfree(gid_cache);
970 kfree(old_pkey_cache);
971 kfree(tprops);
972 return;
973
974 err:
975 kfree(pkey_cache);
976 kfree(gid_cache);
977 kfree(tprops);
978 }
979
980 static void ib_cache_task(struct work_struct *_work)
981 {
982 struct ib_update_work *work =
983 container_of(_work, struct ib_update_work, work);
984
985 ib_cache_update(work->device, work->port_num);
986 kfree(work);
987 }
988
989 static void ib_cache_event(struct ib_event_handler *handler,
990 struct ib_event *event)
991 {
992 struct ib_update_work *work;
993
994 if (event->event == IB_EVENT_PORT_ERR ||
995 event->event == IB_EVENT_PORT_ACTIVE ||
996 event->event == IB_EVENT_LID_CHANGE ||
997 event->event == IB_EVENT_PKEY_CHANGE ||
998 event->event == IB_EVENT_SM_CHANGE ||
999 event->event == IB_EVENT_CLIENT_REREGISTER ||
1000 event->event == IB_EVENT_GID_CHANGE) {
1001 work = kmalloc(sizeof *work, GFP_ATOMIC);
1002 if (work) {
1003 INIT_WORK(&work->work, ib_cache_task);
1004 work->device = event->device;
1005 work->port_num = event->element.port_num;
1006 queue_work(ib_wq, &work->work);
1007 }
1008 }
1009 }
1010
1011 int ib_cache_setup_one(struct ib_device *device)
1012 {
1013 int p;
1014 int err;
1015
1016 rwlock_init(&device->cache.lock);
1017
1018 device->cache.pkey_cache =
1019 kzalloc(sizeof *device->cache.pkey_cache *
1020 (rdma_end_port(device) - rdma_start_port(device) + 1), GFP_KERNEL);
1021 device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
1022 (rdma_end_port(device) -
1023 rdma_start_port(device) + 1),
1024 GFP_KERNEL);
1025 if (!device->cache.pkey_cache ||
1026 !device->cache.lmc_cache) {
1027 printk(KERN_WARNING "Couldn't allocate cache "
1028 "for %s\n", device->name);
1029 return -ENOMEM;
1030 }
1031
1032 err = gid_table_setup_one(device);
1033 if (err)
1034 /* Allocated memory will be cleaned in the release function */
1035 return err;
1036
1037 for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p)
1038 ib_cache_update(device, p + rdma_start_port(device));
1039
1040 INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
1041 device, ib_cache_event);
1042 err = ib_register_event_handler(&device->cache.event_handler);
1043 if (err)
1044 goto err;
1045
1046 return 0;
1047
1048 err:
1049 gid_table_cleanup_one(device);
1050 return err;
1051 }
1052
1053 void ib_cache_release_one(struct ib_device *device)
1054 {
1055 int p;
1056
1057 /*
1058 * The release function frees all the cache elements.
1059 * This function should be called as part of freeing
1060 * all the device's resources when the cache could no
1061 * longer be accessed.
1062 */
1063 if (device->cache.pkey_cache)
1064 for (p = 0;
1065 p <= rdma_end_port(device) - rdma_start_port(device); ++p)
1066 kfree(device->cache.pkey_cache[p]);
1067
1068 gid_table_release_one(device);
1069 kfree(device->cache.pkey_cache);
1070 kfree(device->cache.lmc_cache);
1071 }
1072
1073 void ib_cache_cleanup_one(struct ib_device *device)
1074 {
1075 /* The cleanup function unregisters the event handler,
1076 * waits for all in-progress workqueue elements and cleans
1077 * up the GID cache. This function should be called after
1078 * the device was removed from the devices list and all
1079 * clients were removed, so the cache exists but is
1080 * non-functional and shouldn't be updated anymore.
1081 */
1082 ib_unregister_event_handler(&device->cache.event_handler);
1083 flush_workqueue(ib_wq);
1084 gid_table_cleanup_one(device);
1085 }
1086
1087 void __init ib_cache_setup(void)
1088 {
1089 roce_gid_mgmt_init();
1090 }
1091
1092 void __exit ib_cache_cleanup(void)
1093 {
1094 roce_gid_mgmt_cleanup();
1095 }
Linux with added FPC-III support