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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/if_vlan.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
47struct ib_pkey_cache {
48 int table_len;
49 u16 table[] __counted_by(table_len);
50};
51
52struct ib_update_work {
53 struct work_struct work;
54 struct ib_event event;
55 bool enforce_security;
56};
57
58union ib_gid zgid;
59EXPORT_SYMBOL(zgid);
60
61enum gid_attr_find_mask {
62 GID_ATTR_FIND_MASK_GID = 1UL << 0,
63 GID_ATTR_FIND_MASK_NETDEV = 1UL << 1,
64 GID_ATTR_FIND_MASK_DEFAULT = 1UL << 2,
65 GID_ATTR_FIND_MASK_GID_TYPE = 1UL << 3,
66};
67
68enum gid_table_entry_state {
69 GID_TABLE_ENTRY_INVALID = 1,
70 GID_TABLE_ENTRY_VALID = 2,
71 /*
72 * Indicates that entry is pending to be removed, there may
73 * be active users of this GID entry.
74 * When last user of the GID entry releases reference to it,
75 * GID entry is detached from the table.
76 */
77 GID_TABLE_ENTRY_PENDING_DEL = 3,
78};
79
80struct roce_gid_ndev_storage {
81 struct rcu_head rcu_head;
82 struct net_device *ndev;
83};
84
85struct ib_gid_table_entry {
86 struct kref kref;
87 struct work_struct del_work;
88 struct ib_gid_attr attr;
89 void *context;
90 /* Store the ndev pointer to release reference later on in
91 * call_rcu context because by that time gid_table_entry
92 * and attr might be already freed. So keep a copy of it.
93 * ndev_storage is freed by rcu callback.
94 */
95 struct roce_gid_ndev_storage *ndev_storage;
96 enum gid_table_entry_state state;
97};
98
99struct ib_gid_table {
100 int sz;
101 /* In RoCE, adding a GID to the table requires:
102 * (a) Find if this GID is already exists.
103 * (b) Find a free space.
104 * (c) Write the new GID
105 *
106 * Delete requires different set of operations:
107 * (a) Find the GID
108 * (b) Delete it.
109 *
110 **/
111 /* Any writer to data_vec must hold this lock and the write side of
112 * rwlock. Readers must hold only rwlock. All writers must be in a
113 * sleepable context.
114 */
115 struct mutex lock;
116 /* rwlock protects data_vec[ix]->state and entry pointer.
117 */
118 rwlock_t rwlock;
119 struct ib_gid_table_entry **data_vec;
120 /* bit field, each bit indicates the index of default GID */
121 u32 default_gid_indices;
122};
123
124static void dispatch_gid_change_event(struct ib_device *ib_dev, u32 port)
125{
126 struct ib_event event;
127
128 event.device = ib_dev;
129 event.element.port_num = port;
130 event.event = IB_EVENT_GID_CHANGE;
131
132 ib_dispatch_event_clients(&event);
133}
134
135static const char * const gid_type_str[] = {
136 /* IB/RoCE v1 value is set for IB_GID_TYPE_IB and IB_GID_TYPE_ROCE for
137 * user space compatibility reasons.
138 */
139 [IB_GID_TYPE_IB] = "IB/RoCE v1",
140 [IB_GID_TYPE_ROCE] = "IB/RoCE v1",
141 [IB_GID_TYPE_ROCE_UDP_ENCAP] = "RoCE v2",
142};
143
144const char *ib_cache_gid_type_str(enum ib_gid_type gid_type)
145{
146 if (gid_type < ARRAY_SIZE(gid_type_str) && gid_type_str[gid_type])
147 return gid_type_str[gid_type];
148
149 return "Invalid GID type";
150}
151EXPORT_SYMBOL(ib_cache_gid_type_str);
152
153/** rdma_is_zero_gid - Check if given GID is zero or not.
154 * @gid: GID to check
155 * Returns true if given GID is zero, returns false otherwise.
156 */
157bool rdma_is_zero_gid(const union ib_gid *gid)
158{
159 return !memcmp(gid, &zgid, sizeof(*gid));
160}
161EXPORT_SYMBOL(rdma_is_zero_gid);
162
163/** is_gid_index_default - Check if a given index belongs to
164 * reserved default GIDs or not.
165 * @table: GID table pointer
166 * @index: Index to check in GID table
167 * Returns true if index is one of the reserved default GID index otherwise
168 * returns false.
169 */
170static bool is_gid_index_default(const struct ib_gid_table *table,
171 unsigned int index)
172{
173 return index < 32 && (BIT(index) & table->default_gid_indices);
174}
175
176int ib_cache_gid_parse_type_str(const char *buf)
177{
178 unsigned int i;
179 size_t len;
180 int err = -EINVAL;
181
182 len = strlen(buf);
183 if (len == 0)
184 return -EINVAL;
185
186 if (buf[len - 1] == '\n')
187 len--;
188
189 for (i = 0; i < ARRAY_SIZE(gid_type_str); ++i)
190 if (gid_type_str[i] && !strncmp(buf, gid_type_str[i], len) &&
191 len == strlen(gid_type_str[i])) {
192 err = i;
193 break;
194 }
195
196 return err;
197}
198EXPORT_SYMBOL(ib_cache_gid_parse_type_str);
199
200static struct ib_gid_table *rdma_gid_table(struct ib_device *device, u32 port)
201{
202 return device->port_data[port].cache.gid;
203}
204
205static bool is_gid_entry_free(const struct ib_gid_table_entry *entry)
206{
207 return !entry;
208}
209
210static bool is_gid_entry_valid(const struct ib_gid_table_entry *entry)
211{
212 return entry && entry->state == GID_TABLE_ENTRY_VALID;
213}
214
215static void schedule_free_gid(struct kref *kref)
216{
217 struct ib_gid_table_entry *entry =
218 container_of(kref, struct ib_gid_table_entry, kref);
219
220 queue_work(ib_wq, &entry->del_work);
221}
222
223static void put_gid_ndev(struct rcu_head *head)
224{
225 struct roce_gid_ndev_storage *storage =
226 container_of(head, struct roce_gid_ndev_storage, rcu_head);
227
228 WARN_ON(!storage->ndev);
229 /* At this point its safe to release netdev reference,
230 * as all callers working on gid_attr->ndev are done
231 * using this netdev.
232 */
233 dev_put(storage->ndev);
234 kfree(storage);
235}
236
237static void free_gid_entry_locked(struct ib_gid_table_entry *entry)
238{
239 struct ib_device *device = entry->attr.device;
240 u32 port_num = entry->attr.port_num;
241 struct ib_gid_table *table = rdma_gid_table(device, port_num);
242
243 dev_dbg(&device->dev, "%s port=%u index=%u gid %pI6\n", __func__,
244 port_num, entry->attr.index, entry->attr.gid.raw);
245
246 write_lock_irq(&table->rwlock);
247
248 /*
249 * The only way to avoid overwriting NULL in table is
250 * by comparing if it is same entry in table or not!
251 * If new entry in table is added by the time we free here,
252 * don't overwrite the table entry.
253 */
254 if (entry == table->data_vec[entry->attr.index])
255 table->data_vec[entry->attr.index] = NULL;
256 /* Now this index is ready to be allocated */
257 write_unlock_irq(&table->rwlock);
258
259 if (entry->ndev_storage)
260 call_rcu(&entry->ndev_storage->rcu_head, put_gid_ndev);
261 kfree(entry);
262}
263
264static void free_gid_entry(struct kref *kref)
265{
266 struct ib_gid_table_entry *entry =
267 container_of(kref, struct ib_gid_table_entry, kref);
268
269 free_gid_entry_locked(entry);
270}
271
272/**
273 * free_gid_work - Release reference to the GID entry
274 * @work: Work structure to refer to GID entry which needs to be
275 * deleted.
276 *
277 * free_gid_work() frees the entry from the HCA's hardware table
278 * if provider supports it. It releases reference to netdevice.
279 */
280static void free_gid_work(struct work_struct *work)
281{
282 struct ib_gid_table_entry *entry =
283 container_of(work, struct ib_gid_table_entry, del_work);
284 struct ib_device *device = entry->attr.device;
285 u32 port_num = entry->attr.port_num;
286 struct ib_gid_table *table = rdma_gid_table(device, port_num);
287
288 mutex_lock(&table->lock);
289 free_gid_entry_locked(entry);
290 mutex_unlock(&table->lock);
291}
292
293static struct ib_gid_table_entry *
294alloc_gid_entry(const struct ib_gid_attr *attr)
295{
296 struct ib_gid_table_entry *entry;
297 struct net_device *ndev;
298
299 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
300 if (!entry)
301 return NULL;
302
303 ndev = rcu_dereference_protected(attr->ndev, 1);
304 if (ndev) {
305 entry->ndev_storage = kzalloc(sizeof(*entry->ndev_storage),
306 GFP_KERNEL);
307 if (!entry->ndev_storage) {
308 kfree(entry);
309 return NULL;
310 }
311 dev_hold(ndev);
312 entry->ndev_storage->ndev = ndev;
313 }
314 kref_init(&entry->kref);
315 memcpy(&entry->attr, attr, sizeof(*attr));
316 INIT_WORK(&entry->del_work, free_gid_work);
317 entry->state = GID_TABLE_ENTRY_INVALID;
318 return entry;
319}
320
321static void store_gid_entry(struct ib_gid_table *table,
322 struct ib_gid_table_entry *entry)
323{
324 entry->state = GID_TABLE_ENTRY_VALID;
325
326 dev_dbg(&entry->attr.device->dev, "%s port=%u index=%u gid %pI6\n",
327 __func__, entry->attr.port_num, entry->attr.index,
328 entry->attr.gid.raw);
329
330 lockdep_assert_held(&table->lock);
331 write_lock_irq(&table->rwlock);
332 table->data_vec[entry->attr.index] = entry;
333 write_unlock_irq(&table->rwlock);
334}
335
336static void get_gid_entry(struct ib_gid_table_entry *entry)
337{
338 kref_get(&entry->kref);
339}
340
341static void put_gid_entry(struct ib_gid_table_entry *entry)
342{
343 kref_put(&entry->kref, schedule_free_gid);
344}
345
346static void put_gid_entry_locked(struct ib_gid_table_entry *entry)
347{
348 kref_put(&entry->kref, free_gid_entry);
349}
350
351static int add_roce_gid(struct ib_gid_table_entry *entry)
352{
353 const struct ib_gid_attr *attr = &entry->attr;
354 int ret;
355
356 if (!attr->ndev) {
357 dev_err(&attr->device->dev, "%s NULL netdev port=%u index=%u\n",
358 __func__, attr->port_num, attr->index);
359 return -EINVAL;
360 }
361 if (rdma_cap_roce_gid_table(attr->device, attr->port_num)) {
362 ret = attr->device->ops.add_gid(attr, &entry->context);
363 if (ret) {
364 dev_err(&attr->device->dev,
365 "%s GID add failed port=%u index=%u\n",
366 __func__, attr->port_num, attr->index);
367 return ret;
368 }
369 }
370 return 0;
371}
372
373/**
374 * del_gid - Delete GID table entry
375 *
376 * @ib_dev: IB device whose GID entry to be deleted
377 * @port: Port number of the IB device
378 * @table: GID table of the IB device for a port
379 * @ix: GID entry index to delete
380 *
381 */
382static void del_gid(struct ib_device *ib_dev, u32 port,
383 struct ib_gid_table *table, int ix)
384{
385 struct roce_gid_ndev_storage *ndev_storage;
386 struct ib_gid_table_entry *entry;
387
388 lockdep_assert_held(&table->lock);
389
390 dev_dbg(&ib_dev->dev, "%s port=%u index=%d gid %pI6\n", __func__, port,
391 ix, table->data_vec[ix]->attr.gid.raw);
392
393 write_lock_irq(&table->rwlock);
394 entry = table->data_vec[ix];
395 entry->state = GID_TABLE_ENTRY_PENDING_DEL;
396 /*
397 * For non RoCE protocol, GID entry slot is ready to use.
398 */
399 if (!rdma_protocol_roce(ib_dev, port))
400 table->data_vec[ix] = NULL;
401 write_unlock_irq(&table->rwlock);
402
403 if (rdma_cap_roce_gid_table(ib_dev, port))
404 ib_dev->ops.del_gid(&entry->attr, &entry->context);
405
406 ndev_storage = entry->ndev_storage;
407 if (ndev_storage) {
408 entry->ndev_storage = NULL;
409 rcu_assign_pointer(entry->attr.ndev, NULL);
410 call_rcu(&ndev_storage->rcu_head, put_gid_ndev);
411 }
412
413 put_gid_entry_locked(entry);
414}
415
416/**
417 * add_modify_gid - Add or modify GID table entry
418 *
419 * @table: GID table in which GID to be added or modified
420 * @attr: Attributes of the GID
421 *
422 * Returns 0 on success or appropriate error code. It accepts zero
423 * GID addition for non RoCE ports for HCA's who report them as valid
424 * GID. However such zero GIDs are not added to the cache.
425 */
426static int add_modify_gid(struct ib_gid_table *table,
427 const struct ib_gid_attr *attr)
428{
429 struct ib_gid_table_entry *entry;
430 int ret = 0;
431
432 /*
433 * Invalidate any old entry in the table to make it safe to write to
434 * this index.
435 */
436 if (is_gid_entry_valid(table->data_vec[attr->index]))
437 del_gid(attr->device, attr->port_num, table, attr->index);
438
439 /*
440 * Some HCA's report multiple GID entries with only one valid GID, and
441 * leave other unused entries as the zero GID. Convert zero GIDs to
442 * empty table entries instead of storing them.
443 */
444 if (rdma_is_zero_gid(&attr->gid))
445 return 0;
446
447 entry = alloc_gid_entry(attr);
448 if (!entry)
449 return -ENOMEM;
450
451 if (rdma_protocol_roce(attr->device, attr->port_num)) {
452 ret = add_roce_gid(entry);
453 if (ret)
454 goto done;
455 }
456
457 store_gid_entry(table, entry);
458 return 0;
459
460done:
461 put_gid_entry(entry);
462 return ret;
463}
464
465/* rwlock should be read locked, or lock should be held */
466static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
467 const struct ib_gid_attr *val, bool default_gid,
468 unsigned long mask, int *pempty)
469{
470 int i = 0;
471 int found = -1;
472 int empty = pempty ? -1 : 0;
473
474 while (i < table->sz && (found < 0 || empty < 0)) {
475 struct ib_gid_table_entry *data = table->data_vec[i];
476 struct ib_gid_attr *attr;
477 int curr_index = i;
478
479 i++;
480
481 /* find_gid() is used during GID addition where it is expected
482 * to return a free entry slot which is not duplicate.
483 * Free entry slot is requested and returned if pempty is set,
484 * so lookup free slot only if requested.
485 */
486 if (pempty && empty < 0) {
487 if (is_gid_entry_free(data) &&
488 default_gid ==
489 is_gid_index_default(table, curr_index)) {
490 /*
491 * Found an invalid (free) entry; allocate it.
492 * If default GID is requested, then our
493 * found slot must be one of the DEFAULT
494 * reserved slots or we fail.
495 * This ensures that only DEFAULT reserved
496 * slots are used for default property GIDs.
497 */
498 empty = curr_index;
499 }
500 }
501
502 /*
503 * Additionally find_gid() is used to find valid entry during
504 * lookup operation; so ignore the entries which are marked as
505 * pending for removal and the entries which are marked as
506 * invalid.
507 */
508 if (!is_gid_entry_valid(data))
509 continue;
510
511 if (found >= 0)
512 continue;
513
514 attr = &data->attr;
515 if (mask & GID_ATTR_FIND_MASK_GID_TYPE &&
516 attr->gid_type != val->gid_type)
517 continue;
518
519 if (mask & GID_ATTR_FIND_MASK_GID &&
520 memcmp(gid, &data->attr.gid, sizeof(*gid)))
521 continue;
522
523 if (mask & GID_ATTR_FIND_MASK_NETDEV &&
524 attr->ndev != val->ndev)
525 continue;
526
527 if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
528 is_gid_index_default(table, curr_index) != default_gid)
529 continue;
530
531 found = curr_index;
532 }
533
534 if (pempty)
535 *pempty = empty;
536
537 return found;
538}
539
540static void make_default_gid(struct net_device *dev, union ib_gid *gid)
541{
542 gid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
543 addrconf_ifid_eui48(&gid->raw[8], dev);
544}
545
546static int __ib_cache_gid_add(struct ib_device *ib_dev, u32 port,
547 union ib_gid *gid, struct ib_gid_attr *attr,
548 unsigned long mask, bool default_gid)
549{
550 struct ib_gid_table *table;
551 int ret = 0;
552 int empty;
553 int ix;
554
555 /* Do not allow adding zero GID in support of
556 * IB spec version 1.3 section 4.1.1 point (6) and
557 * section 12.7.10 and section 12.7.20
558 */
559 if (rdma_is_zero_gid(gid))
560 return -EINVAL;
561
562 table = rdma_gid_table(ib_dev, port);
563
564 mutex_lock(&table->lock);
565
566 ix = find_gid(table, gid, attr, default_gid, mask, &empty);
567 if (ix >= 0)
568 goto out_unlock;
569
570 if (empty < 0) {
571 ret = -ENOSPC;
572 goto out_unlock;
573 }
574 attr->device = ib_dev;
575 attr->index = empty;
576 attr->port_num = port;
577 attr->gid = *gid;
578 ret = add_modify_gid(table, attr);
579 if (!ret)
580 dispatch_gid_change_event(ib_dev, port);
581
582out_unlock:
583 mutex_unlock(&table->lock);
584 if (ret)
585 pr_warn("%s: unable to add gid %pI6 error=%d\n",
586 __func__, gid->raw, ret);
587 return ret;
588}
589
590int ib_cache_gid_add(struct ib_device *ib_dev, u32 port,
591 union ib_gid *gid, struct ib_gid_attr *attr)
592{
593 unsigned long mask = GID_ATTR_FIND_MASK_GID |
594 GID_ATTR_FIND_MASK_GID_TYPE |
595 GID_ATTR_FIND_MASK_NETDEV;
596
597 return __ib_cache_gid_add(ib_dev, port, gid, attr, mask, false);
598}
599
600static int
601_ib_cache_gid_del(struct ib_device *ib_dev, u32 port,
602 union ib_gid *gid, struct ib_gid_attr *attr,
603 unsigned long mask, bool default_gid)
604{
605 struct ib_gid_table *table;
606 int ret = 0;
607 int ix;
608
609 table = rdma_gid_table(ib_dev, port);
610
611 mutex_lock(&table->lock);
612
613 ix = find_gid(table, gid, attr, default_gid, mask, NULL);
614 if (ix < 0) {
615 ret = -EINVAL;
616 goto out_unlock;
617 }
618
619 del_gid(ib_dev, port, table, ix);
620 dispatch_gid_change_event(ib_dev, port);
621
622out_unlock:
623 mutex_unlock(&table->lock);
624 if (ret)
625 pr_debug("%s: can't delete gid %pI6 error=%d\n",
626 __func__, gid->raw, ret);
627 return ret;
628}
629
630int ib_cache_gid_del(struct ib_device *ib_dev, u32 port,
631 union ib_gid *gid, struct ib_gid_attr *attr)
632{
633 unsigned long mask = GID_ATTR_FIND_MASK_GID |
634 GID_ATTR_FIND_MASK_GID_TYPE |
635 GID_ATTR_FIND_MASK_DEFAULT |
636 GID_ATTR_FIND_MASK_NETDEV;
637
638 return _ib_cache_gid_del(ib_dev, port, gid, attr, mask, false);
639}
640
641int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u32 port,
642 struct net_device *ndev)
643{
644 struct ib_gid_table *table;
645 int ix;
646 bool deleted = false;
647
648 table = rdma_gid_table(ib_dev, port);
649
650 mutex_lock(&table->lock);
651
652 for (ix = 0; ix < table->sz; ix++) {
653 if (is_gid_entry_valid(table->data_vec[ix]) &&
654 table->data_vec[ix]->attr.ndev == ndev) {
655 del_gid(ib_dev, port, table, ix);
656 deleted = true;
657 }
658 }
659
660 mutex_unlock(&table->lock);
661
662 if (deleted)
663 dispatch_gid_change_event(ib_dev, port);
664
665 return 0;
666}
667
668/**
669 * rdma_find_gid_by_port - Returns the GID entry attributes when it finds
670 * a valid GID entry for given search parameters. It searches for the specified
671 * GID value in the local software cache.
672 * @ib_dev: The device to query.
673 * @gid: The GID value to search for.
674 * @gid_type: The GID type to search for.
675 * @port: The port number of the device where the GID value should be searched.
676 * @ndev: In RoCE, the net device of the device. NULL means ignore.
677 *
678 * Returns sgid attributes if the GID is found with valid reference or
679 * returns ERR_PTR for the error.
680 * The caller must invoke rdma_put_gid_attr() to release the reference.
681 */
682const struct ib_gid_attr *
683rdma_find_gid_by_port(struct ib_device *ib_dev,
684 const union ib_gid *gid,
685 enum ib_gid_type gid_type,
686 u32 port, struct net_device *ndev)
687{
688 int local_index;
689 struct ib_gid_table *table;
690 unsigned long mask = GID_ATTR_FIND_MASK_GID |
691 GID_ATTR_FIND_MASK_GID_TYPE;
692 struct ib_gid_attr val = {.ndev = ndev, .gid_type = gid_type};
693 const struct ib_gid_attr *attr;
694 unsigned long flags;
695
696 if (!rdma_is_port_valid(ib_dev, port))
697 return ERR_PTR(-ENOENT);
698
699 table = rdma_gid_table(ib_dev, port);
700
701 if (ndev)
702 mask |= GID_ATTR_FIND_MASK_NETDEV;
703
704 read_lock_irqsave(&table->rwlock, flags);
705 local_index = find_gid(table, gid, &val, false, mask, NULL);
706 if (local_index >= 0) {
707 get_gid_entry(table->data_vec[local_index]);
708 attr = &table->data_vec[local_index]->attr;
709 read_unlock_irqrestore(&table->rwlock, flags);
710 return attr;
711 }
712
713 read_unlock_irqrestore(&table->rwlock, flags);
714 return ERR_PTR(-ENOENT);
715}
716EXPORT_SYMBOL(rdma_find_gid_by_port);
717
718/**
719 * rdma_find_gid_by_filter - Returns the GID table attribute where a
720 * specified GID value occurs
721 * @ib_dev: The device to query.
722 * @gid: The GID value to search for.
723 * @port: The port number of the device where the GID value could be
724 * searched.
725 * @filter: The filter function is executed on any matching GID in the table.
726 * If the filter function returns true, the corresponding index is returned,
727 * otherwise, we continue searching the GID table. It's guaranteed that
728 * while filter is executed, ndev field is valid and the structure won't
729 * change. filter is executed in an atomic context. filter must not be NULL.
730 * @context: Private data to pass into the call-back.
731 *
732 * rdma_find_gid_by_filter() searches for the specified GID value
733 * of which the filter function returns true in the port's GID table.
734 *
735 */
736const struct ib_gid_attr *rdma_find_gid_by_filter(
737 struct ib_device *ib_dev, const union ib_gid *gid, u32 port,
738 bool (*filter)(const union ib_gid *gid, const struct ib_gid_attr *,
739 void *),
740 void *context)
741{
742 const struct ib_gid_attr *res = ERR_PTR(-ENOENT);
743 struct ib_gid_table *table;
744 unsigned long flags;
745 unsigned int i;
746
747 if (!rdma_is_port_valid(ib_dev, port))
748 return ERR_PTR(-EINVAL);
749
750 table = rdma_gid_table(ib_dev, port);
751
752 read_lock_irqsave(&table->rwlock, flags);
753 for (i = 0; i < table->sz; i++) {
754 struct ib_gid_table_entry *entry = table->data_vec[i];
755
756 if (!is_gid_entry_valid(entry))
757 continue;
758
759 if (memcmp(gid, &entry->attr.gid, sizeof(*gid)))
760 continue;
761
762 if (filter(gid, &entry->attr, context)) {
763 get_gid_entry(entry);
764 res = &entry->attr;
765 break;
766 }
767 }
768 read_unlock_irqrestore(&table->rwlock, flags);
769 return res;
770}
771
772static struct ib_gid_table *alloc_gid_table(int sz)
773{
774 struct ib_gid_table *table = kzalloc(sizeof(*table), GFP_KERNEL);
775
776 if (!table)
777 return NULL;
778
779 table->data_vec = kcalloc(sz, sizeof(*table->data_vec), GFP_KERNEL);
780 if (!table->data_vec)
781 goto err_free_table;
782
783 mutex_init(&table->lock);
784
785 table->sz = sz;
786 rwlock_init(&table->rwlock);
787 return table;
788
789err_free_table:
790 kfree(table);
791 return NULL;
792}
793
794static void release_gid_table(struct ib_device *device,
795 struct ib_gid_table *table)
796{
797 bool leak = false;
798 int i;
799
800 if (!table)
801 return;
802
803 for (i = 0; i < table->sz; i++) {
804 if (is_gid_entry_free(table->data_vec[i]))
805 continue;
806 if (kref_read(&table->data_vec[i]->kref) > 1) {
807 dev_err(&device->dev,
808 "GID entry ref leak for index %d ref=%u\n", i,
809 kref_read(&table->data_vec[i]->kref));
810 leak = true;
811 }
812 }
813 if (leak)
814 return;
815
816 mutex_destroy(&table->lock);
817 kfree(table->data_vec);
818 kfree(table);
819}
820
821static void cleanup_gid_table_port(struct ib_device *ib_dev, u32 port,
822 struct ib_gid_table *table)
823{
824 int i;
825
826 if (!table)
827 return;
828
829 mutex_lock(&table->lock);
830 for (i = 0; i < table->sz; ++i) {
831 if (is_gid_entry_valid(table->data_vec[i]))
832 del_gid(ib_dev, port, table, i);
833 }
834 mutex_unlock(&table->lock);
835}
836
837void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u32 port,
838 struct net_device *ndev,
839 unsigned long gid_type_mask,
840 enum ib_cache_gid_default_mode mode)
841{
842 union ib_gid gid = { };
843 struct ib_gid_attr gid_attr;
844 unsigned int gid_type;
845 unsigned long mask;
846
847 mask = GID_ATTR_FIND_MASK_GID_TYPE |
848 GID_ATTR_FIND_MASK_DEFAULT |
849 GID_ATTR_FIND_MASK_NETDEV;
850 memset(&gid_attr, 0, sizeof(gid_attr));
851 gid_attr.ndev = ndev;
852
853 for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) {
854 if (1UL << gid_type & ~gid_type_mask)
855 continue;
856
857 gid_attr.gid_type = gid_type;
858
859 if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) {
860 make_default_gid(ndev, &gid);
861 __ib_cache_gid_add(ib_dev, port, &gid,
862 &gid_attr, mask, true);
863 } else if (mode == IB_CACHE_GID_DEFAULT_MODE_DELETE) {
864 _ib_cache_gid_del(ib_dev, port, &gid,
865 &gid_attr, mask, true);
866 }
867 }
868}
869
870static void gid_table_reserve_default(struct ib_device *ib_dev, u32 port,
871 struct ib_gid_table *table)
872{
873 unsigned int i;
874 unsigned long roce_gid_type_mask;
875 unsigned int num_default_gids;
876
877 roce_gid_type_mask = roce_gid_type_mask_support(ib_dev, port);
878 num_default_gids = hweight_long(roce_gid_type_mask);
879 /* Reserve starting indices for default GIDs */
880 for (i = 0; i < num_default_gids && i < table->sz; i++)
881 table->default_gid_indices |= BIT(i);
882}
883
884
885static void gid_table_release_one(struct ib_device *ib_dev)
886{
887 u32 p;
888
889 rdma_for_each_port (ib_dev, p) {
890 release_gid_table(ib_dev, ib_dev->port_data[p].cache.gid);
891 ib_dev->port_data[p].cache.gid = NULL;
892 }
893}
894
895static int _gid_table_setup_one(struct ib_device *ib_dev)
896{
897 struct ib_gid_table *table;
898 u32 rdma_port;
899
900 rdma_for_each_port (ib_dev, rdma_port) {
901 table = alloc_gid_table(
902 ib_dev->port_data[rdma_port].immutable.gid_tbl_len);
903 if (!table)
904 goto rollback_table_setup;
905
906 gid_table_reserve_default(ib_dev, rdma_port, table);
907 ib_dev->port_data[rdma_port].cache.gid = table;
908 }
909 return 0;
910
911rollback_table_setup:
912 gid_table_release_one(ib_dev);
913 return -ENOMEM;
914}
915
916static void gid_table_cleanup_one(struct ib_device *ib_dev)
917{
918 u32 p;
919
920 rdma_for_each_port (ib_dev, p)
921 cleanup_gid_table_port(ib_dev, p,
922 ib_dev->port_data[p].cache.gid);
923}
924
925static int gid_table_setup_one(struct ib_device *ib_dev)
926{
927 int err;
928
929 err = _gid_table_setup_one(ib_dev);
930
931 if (err)
932 return err;
933
934 rdma_roce_rescan_device(ib_dev);
935
936 return err;
937}
938
939/**
940 * rdma_query_gid - Read the GID content from the GID software cache
941 * @device: Device to query the GID
942 * @port_num: Port number of the device
943 * @index: Index of the GID table entry to read
944 * @gid: Pointer to GID where to store the entry's GID
945 *
946 * rdma_query_gid() only reads the GID entry content for requested device,
947 * port and index. It reads for IB, RoCE and iWarp link layers. It doesn't
948 * hold any reference to the GID table entry in the HCA or software cache.
949 *
950 * Returns 0 on success or appropriate error code.
951 *
952 */
953int rdma_query_gid(struct ib_device *device, u32 port_num,
954 int index, union ib_gid *gid)
955{
956 struct ib_gid_table *table;
957 unsigned long flags;
958 int res;
959
960 if (!rdma_is_port_valid(device, port_num))
961 return -EINVAL;
962
963 table = rdma_gid_table(device, port_num);
964 read_lock_irqsave(&table->rwlock, flags);
965
966 if (index < 0 || index >= table->sz) {
967 res = -EINVAL;
968 goto done;
969 }
970
971 if (!is_gid_entry_valid(table->data_vec[index])) {
972 res = -ENOENT;
973 goto done;
974 }
975
976 memcpy(gid, &table->data_vec[index]->attr.gid, sizeof(*gid));
977 res = 0;
978
979done:
980 read_unlock_irqrestore(&table->rwlock, flags);
981 return res;
982}
983EXPORT_SYMBOL(rdma_query_gid);
984
985/**
986 * rdma_read_gid_hw_context - Read the HW GID context from GID attribute
987 * @attr: Potinter to the GID attribute
988 *
989 * rdma_read_gid_hw_context() reads the drivers GID HW context corresponding
990 * to the SGID attr. Callers are required to already be holding the reference
991 * to an existing GID entry.
992 *
993 * Returns the HW GID context
994 *
995 */
996void *rdma_read_gid_hw_context(const struct ib_gid_attr *attr)
997{
998 return container_of(attr, struct ib_gid_table_entry, attr)->context;
999}
1000EXPORT_SYMBOL(rdma_read_gid_hw_context);
1001
1002/**
1003 * rdma_find_gid - Returns SGID attributes if the matching GID is found.
1004 * @device: The device to query.
1005 * @gid: The GID value to search for.
1006 * @gid_type: The GID type to search for.
1007 * @ndev: In RoCE, the net device of the device. NULL means ignore.
1008 *
1009 * rdma_find_gid() searches for the specified GID value in the software cache.
1010 *
1011 * Returns GID attributes if a valid GID is found or returns ERR_PTR for the
1012 * error. The caller must invoke rdma_put_gid_attr() to release the reference.
1013 *
1014 */
1015const struct ib_gid_attr *rdma_find_gid(struct ib_device *device,
1016 const union ib_gid *gid,
1017 enum ib_gid_type gid_type,
1018 struct net_device *ndev)
1019{
1020 unsigned long mask = GID_ATTR_FIND_MASK_GID |
1021 GID_ATTR_FIND_MASK_GID_TYPE;
1022 struct ib_gid_attr gid_attr_val = {.ndev = ndev, .gid_type = gid_type};
1023 u32 p;
1024
1025 if (ndev)
1026 mask |= GID_ATTR_FIND_MASK_NETDEV;
1027
1028 rdma_for_each_port(device, p) {
1029 struct ib_gid_table *table;
1030 unsigned long flags;
1031 int index;
1032
1033 table = device->port_data[p].cache.gid;
1034 read_lock_irqsave(&table->rwlock, flags);
1035 index = find_gid(table, gid, &gid_attr_val, false, mask, NULL);
1036 if (index >= 0) {
1037 const struct ib_gid_attr *attr;
1038
1039 get_gid_entry(table->data_vec[index]);
1040 attr = &table->data_vec[index]->attr;
1041 read_unlock_irqrestore(&table->rwlock, flags);
1042 return attr;
1043 }
1044 read_unlock_irqrestore(&table->rwlock, flags);
1045 }
1046
1047 return ERR_PTR(-ENOENT);
1048}
1049EXPORT_SYMBOL(rdma_find_gid);
1050
1051int ib_get_cached_pkey(struct ib_device *device,
1052 u32 port_num,
1053 int index,
1054 u16 *pkey)
1055{
1056 struct ib_pkey_cache *cache;
1057 unsigned long flags;
1058 int ret = 0;
1059
1060 if (!rdma_is_port_valid(device, port_num))
1061 return -EINVAL;
1062
1063 read_lock_irqsave(&device->cache_lock, flags);
1064
1065 cache = device->port_data[port_num].cache.pkey;
1066
1067 if (!cache || index < 0 || index >= cache->table_len)
1068 ret = -EINVAL;
1069 else
1070 *pkey = cache->table[index];
1071
1072 read_unlock_irqrestore(&device->cache_lock, flags);
1073
1074 return ret;
1075}
1076EXPORT_SYMBOL(ib_get_cached_pkey);
1077
1078void ib_get_cached_subnet_prefix(struct ib_device *device, u32 port_num,
1079 u64 *sn_pfx)
1080{
1081 unsigned long flags;
1082
1083 read_lock_irqsave(&device->cache_lock, flags);
1084 *sn_pfx = device->port_data[port_num].cache.subnet_prefix;
1085 read_unlock_irqrestore(&device->cache_lock, flags);
1086}
1087EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
1088
1089int ib_find_cached_pkey(struct ib_device *device, u32 port_num,
1090 u16 pkey, u16 *index)
1091{
1092 struct ib_pkey_cache *cache;
1093 unsigned long flags;
1094 int i;
1095 int ret = -ENOENT;
1096 int partial_ix = -1;
1097
1098 if (!rdma_is_port_valid(device, port_num))
1099 return -EINVAL;
1100
1101 read_lock_irqsave(&device->cache_lock, flags);
1102
1103 cache = device->port_data[port_num].cache.pkey;
1104 if (!cache) {
1105 ret = -EINVAL;
1106 goto err;
1107 }
1108
1109 *index = -1;
1110
1111 for (i = 0; i < cache->table_len; ++i)
1112 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
1113 if (cache->table[i] & 0x8000) {
1114 *index = i;
1115 ret = 0;
1116 break;
1117 } else {
1118 partial_ix = i;
1119 }
1120 }
1121
1122 if (ret && partial_ix >= 0) {
1123 *index = partial_ix;
1124 ret = 0;
1125 }
1126
1127err:
1128 read_unlock_irqrestore(&device->cache_lock, flags);
1129
1130 return ret;
1131}
1132EXPORT_SYMBOL(ib_find_cached_pkey);
1133
1134int ib_find_exact_cached_pkey(struct ib_device *device, u32 port_num,
1135 u16 pkey, u16 *index)
1136{
1137 struct ib_pkey_cache *cache;
1138 unsigned long flags;
1139 int i;
1140 int ret = -ENOENT;
1141
1142 if (!rdma_is_port_valid(device, port_num))
1143 return -EINVAL;
1144
1145 read_lock_irqsave(&device->cache_lock, flags);
1146
1147 cache = device->port_data[port_num].cache.pkey;
1148 if (!cache) {
1149 ret = -EINVAL;
1150 goto err;
1151 }
1152
1153 *index = -1;
1154
1155 for (i = 0; i < cache->table_len; ++i)
1156 if (cache->table[i] == pkey) {
1157 *index = i;
1158 ret = 0;
1159 break;
1160 }
1161
1162err:
1163 read_unlock_irqrestore(&device->cache_lock, flags);
1164
1165 return ret;
1166}
1167EXPORT_SYMBOL(ib_find_exact_cached_pkey);
1168
1169int ib_get_cached_lmc(struct ib_device *device, u32 port_num, u8 *lmc)
1170{
1171 unsigned long flags;
1172 int ret = 0;
1173
1174 if (!rdma_is_port_valid(device, port_num))
1175 return -EINVAL;
1176
1177 read_lock_irqsave(&device->cache_lock, flags);
1178 *lmc = device->port_data[port_num].cache.lmc;
1179 read_unlock_irqrestore(&device->cache_lock, flags);
1180
1181 return ret;
1182}
1183EXPORT_SYMBOL(ib_get_cached_lmc);
1184
1185int ib_get_cached_port_state(struct ib_device *device, u32 port_num,
1186 enum ib_port_state *port_state)
1187{
1188 unsigned long flags;
1189 int ret = 0;
1190
1191 if (!rdma_is_port_valid(device, port_num))
1192 return -EINVAL;
1193
1194 read_lock_irqsave(&device->cache_lock, flags);
1195 *port_state = device->port_data[port_num].cache.port_state;
1196 read_unlock_irqrestore(&device->cache_lock, flags);
1197
1198 return ret;
1199}
1200EXPORT_SYMBOL(ib_get_cached_port_state);
1201
1202/**
1203 * rdma_get_gid_attr - Returns GID attributes for a port of a device
1204 * at a requested gid_index, if a valid GID entry exists.
1205 * @device: The device to query.
1206 * @port_num: The port number on the device where the GID value
1207 * is to be queried.
1208 * @index: Index of the GID table entry whose attributes are to
1209 * be queried.
1210 *
1211 * rdma_get_gid_attr() acquires reference count of gid attributes from the
1212 * cached GID table. Caller must invoke rdma_put_gid_attr() to release
1213 * reference to gid attribute regardless of link layer.
1214 *
1215 * Returns pointer to valid gid attribute or ERR_PTR for the appropriate error
1216 * code.
1217 */
1218const struct ib_gid_attr *
1219rdma_get_gid_attr(struct ib_device *device, u32 port_num, int index)
1220{
1221 const struct ib_gid_attr *attr = ERR_PTR(-ENODATA);
1222 struct ib_gid_table *table;
1223 unsigned long flags;
1224
1225 if (!rdma_is_port_valid(device, port_num))
1226 return ERR_PTR(-EINVAL);
1227
1228 table = rdma_gid_table(device, port_num);
1229 if (index < 0 || index >= table->sz)
1230 return ERR_PTR(-EINVAL);
1231
1232 read_lock_irqsave(&table->rwlock, flags);
1233 if (!is_gid_entry_valid(table->data_vec[index]))
1234 goto done;
1235
1236 get_gid_entry(table->data_vec[index]);
1237 attr = &table->data_vec[index]->attr;
1238done:
1239 read_unlock_irqrestore(&table->rwlock, flags);
1240 return attr;
1241}
1242EXPORT_SYMBOL(rdma_get_gid_attr);
1243
1244/**
1245 * rdma_query_gid_table - Reads GID table entries of all the ports of a device up to max_entries.
1246 * @device: The device to query.
1247 * @entries: Entries where GID entries are returned.
1248 * @max_entries: Maximum number of entries that can be returned.
1249 * Entries array must be allocated to hold max_entries number of entries.
1250 *
1251 * Returns number of entries on success or appropriate error code.
1252 */
1253ssize_t rdma_query_gid_table(struct ib_device *device,
1254 struct ib_uverbs_gid_entry *entries,
1255 size_t max_entries)
1256{
1257 const struct ib_gid_attr *gid_attr;
1258 ssize_t num_entries = 0, ret;
1259 struct ib_gid_table *table;
1260 u32 port_num, i;
1261 struct net_device *ndev;
1262 unsigned long flags;
1263
1264 rdma_for_each_port(device, port_num) {
1265 table = rdma_gid_table(device, port_num);
1266 read_lock_irqsave(&table->rwlock, flags);
1267 for (i = 0; i < table->sz; i++) {
1268 if (!is_gid_entry_valid(table->data_vec[i]))
1269 continue;
1270 if (num_entries >= max_entries) {
1271 ret = -EINVAL;
1272 goto err;
1273 }
1274
1275 gid_attr = &table->data_vec[i]->attr;
1276
1277 memcpy(&entries->gid, &gid_attr->gid,
1278 sizeof(gid_attr->gid));
1279 entries->gid_index = gid_attr->index;
1280 entries->port_num = gid_attr->port_num;
1281 entries->gid_type = gid_attr->gid_type;
1282 ndev = rcu_dereference_protected(
1283 gid_attr->ndev,
1284 lockdep_is_held(&table->rwlock));
1285 if (ndev)
1286 entries->netdev_ifindex = ndev->ifindex;
1287
1288 num_entries++;
1289 entries++;
1290 }
1291 read_unlock_irqrestore(&table->rwlock, flags);
1292 }
1293
1294 return num_entries;
1295err:
1296 read_unlock_irqrestore(&table->rwlock, flags);
1297 return ret;
1298}
1299EXPORT_SYMBOL(rdma_query_gid_table);
1300
1301/**
1302 * rdma_put_gid_attr - Release reference to the GID attribute
1303 * @attr: Pointer to the GID attribute whose reference
1304 * needs to be released.
1305 *
1306 * rdma_put_gid_attr() must be used to release reference whose
1307 * reference is acquired using rdma_get_gid_attr() or any APIs
1308 * which returns a pointer to the ib_gid_attr regardless of link layer
1309 * of IB or RoCE.
1310 *
1311 */
1312void rdma_put_gid_attr(const struct ib_gid_attr *attr)
1313{
1314 struct ib_gid_table_entry *entry =
1315 container_of(attr, struct ib_gid_table_entry, attr);
1316
1317 put_gid_entry(entry);
1318}
1319EXPORT_SYMBOL(rdma_put_gid_attr);
1320
1321/**
1322 * rdma_hold_gid_attr - Get reference to existing GID attribute
1323 *
1324 * @attr: Pointer to the GID attribute whose reference
1325 * needs to be taken.
1326 *
1327 * Increase the reference count to a GID attribute to keep it from being
1328 * freed. Callers are required to already be holding a reference to attribute.
1329 *
1330 */
1331void rdma_hold_gid_attr(const struct ib_gid_attr *attr)
1332{
1333 struct ib_gid_table_entry *entry =
1334 container_of(attr, struct ib_gid_table_entry, attr);
1335
1336 get_gid_entry(entry);
1337}
1338EXPORT_SYMBOL(rdma_hold_gid_attr);
1339
1340/**
1341 * rdma_read_gid_attr_ndev_rcu - Read GID attribute netdevice
1342 * which must be in UP state.
1343 *
1344 * @attr:Pointer to the GID attribute
1345 *
1346 * Returns pointer to netdevice if the netdevice was attached to GID and
1347 * netdevice is in UP state. Caller must hold RCU lock as this API
1348 * reads the netdev flags which can change while netdevice migrates to
1349 * different net namespace. Returns ERR_PTR with error code otherwise.
1350 *
1351 */
1352struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr)
1353{
1354 struct ib_gid_table_entry *entry =
1355 container_of(attr, struct ib_gid_table_entry, attr);
1356 struct ib_device *device = entry->attr.device;
1357 struct net_device *ndev = ERR_PTR(-EINVAL);
1358 u32 port_num = entry->attr.port_num;
1359 struct ib_gid_table *table;
1360 unsigned long flags;
1361 bool valid;
1362
1363 table = rdma_gid_table(device, port_num);
1364
1365 read_lock_irqsave(&table->rwlock, flags);
1366 valid = is_gid_entry_valid(table->data_vec[attr->index]);
1367 if (valid) {
1368 ndev = rcu_dereference(attr->ndev);
1369 if (!ndev)
1370 ndev = ERR_PTR(-ENODEV);
1371 }
1372 read_unlock_irqrestore(&table->rwlock, flags);
1373 return ndev;
1374}
1375EXPORT_SYMBOL(rdma_read_gid_attr_ndev_rcu);
1376
1377static int get_lower_dev_vlan(struct net_device *lower_dev,
1378 struct netdev_nested_priv *priv)
1379{
1380 u16 *vlan_id = (u16 *)priv->data;
1381
1382 if (is_vlan_dev(lower_dev))
1383 *vlan_id = vlan_dev_vlan_id(lower_dev);
1384
1385 /* We are interested only in first level vlan device, so
1386 * always return 1 to stop iterating over next level devices.
1387 */
1388 return 1;
1389}
1390
1391/**
1392 * rdma_read_gid_l2_fields - Read the vlan ID and source MAC address
1393 * of a GID entry.
1394 *
1395 * @attr: GID attribute pointer whose L2 fields to be read
1396 * @vlan_id: Pointer to vlan id to fill up if the GID entry has
1397 * vlan id. It is optional.
1398 * @smac: Pointer to smac to fill up for a GID entry. It is optional.
1399 *
1400 * rdma_read_gid_l2_fields() returns 0 on success and returns vlan id
1401 * (if gid entry has vlan) and source MAC, or returns error.
1402 */
1403int rdma_read_gid_l2_fields(const struct ib_gid_attr *attr,
1404 u16 *vlan_id, u8 *smac)
1405{
1406 struct netdev_nested_priv priv = {
1407 .data = (void *)vlan_id,
1408 };
1409 struct net_device *ndev;
1410
1411 rcu_read_lock();
1412 ndev = rcu_dereference(attr->ndev);
1413 if (!ndev) {
1414 rcu_read_unlock();
1415 return -ENODEV;
1416 }
1417 if (smac)
1418 ether_addr_copy(smac, ndev->dev_addr);
1419 if (vlan_id) {
1420 *vlan_id = 0xffff;
1421 if (is_vlan_dev(ndev)) {
1422 *vlan_id = vlan_dev_vlan_id(ndev);
1423 } else {
1424 /* If the netdev is upper device and if it's lower
1425 * device is vlan device, consider vlan id of
1426 * the lower vlan device for this gid entry.
1427 */
1428 netdev_walk_all_lower_dev_rcu(attr->ndev,
1429 get_lower_dev_vlan, &priv);
1430 }
1431 }
1432 rcu_read_unlock();
1433 return 0;
1434}
1435EXPORT_SYMBOL(rdma_read_gid_l2_fields);
1436
1437static int config_non_roce_gid_cache(struct ib_device *device,
1438 u32 port, struct ib_port_attr *tprops)
1439{
1440 struct ib_gid_attr gid_attr = {};
1441 struct ib_gid_table *table;
1442 int ret = 0;
1443 int i;
1444
1445 gid_attr.device = device;
1446 gid_attr.port_num = port;
1447 table = rdma_gid_table(device, port);
1448
1449 mutex_lock(&table->lock);
1450 for (i = 0; i < tprops->gid_tbl_len; ++i) {
1451 if (!device->ops.query_gid)
1452 continue;
1453 ret = device->ops.query_gid(device, port, i, &gid_attr.gid);
1454 if (ret) {
1455 dev_warn(&device->dev,
1456 "query_gid failed (%d) for index %d\n", ret,
1457 i);
1458 goto err;
1459 }
1460
1461 if (rdma_protocol_iwarp(device, port)) {
1462 struct net_device *ndev;
1463
1464 ndev = ib_device_get_netdev(device, port);
1465 if (!ndev)
1466 continue;
1467 RCU_INIT_POINTER(gid_attr.ndev, ndev);
1468 dev_put(ndev);
1469 }
1470
1471 gid_attr.index = i;
1472 tprops->subnet_prefix =
1473 be64_to_cpu(gid_attr.gid.global.subnet_prefix);
1474 add_modify_gid(table, &gid_attr);
1475 }
1476err:
1477 mutex_unlock(&table->lock);
1478 return ret;
1479}
1480
1481static int
1482ib_cache_update(struct ib_device *device, u32 port, bool update_gids,
1483 bool update_pkeys, bool enforce_security)
1484{
1485 struct ib_port_attr *tprops = NULL;
1486 struct ib_pkey_cache *pkey_cache = NULL;
1487 struct ib_pkey_cache *old_pkey_cache = NULL;
1488 int i;
1489 int ret;
1490
1491 if (!rdma_is_port_valid(device, port))
1492 return -EINVAL;
1493
1494 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
1495 if (!tprops)
1496 return -ENOMEM;
1497
1498 ret = ib_query_port(device, port, tprops);
1499 if (ret) {
1500 dev_warn(&device->dev, "ib_query_port failed (%d)\n", ret);
1501 goto err;
1502 }
1503
1504 if (!rdma_protocol_roce(device, port) && update_gids) {
1505 ret = config_non_roce_gid_cache(device, port,
1506 tprops);
1507 if (ret)
1508 goto err;
1509 }
1510
1511 update_pkeys &= !!tprops->pkey_tbl_len;
1512
1513 if (update_pkeys) {
1514 pkey_cache = kmalloc(struct_size(pkey_cache, table,
1515 tprops->pkey_tbl_len),
1516 GFP_KERNEL);
1517 if (!pkey_cache) {
1518 ret = -ENOMEM;
1519 goto err;
1520 }
1521
1522 pkey_cache->table_len = tprops->pkey_tbl_len;
1523
1524 for (i = 0; i < pkey_cache->table_len; ++i) {
1525 ret = ib_query_pkey(device, port, i,
1526 pkey_cache->table + i);
1527 if (ret) {
1528 dev_warn(&device->dev,
1529 "ib_query_pkey failed (%d) for index %d\n",
1530 ret, i);
1531 goto err;
1532 }
1533 }
1534 }
1535
1536 write_lock_irq(&device->cache_lock);
1537
1538 if (update_pkeys) {
1539 old_pkey_cache = device->port_data[port].cache.pkey;
1540 device->port_data[port].cache.pkey = pkey_cache;
1541 }
1542 device->port_data[port].cache.lmc = tprops->lmc;
1543 device->port_data[port].cache.port_state = tprops->state;
1544
1545 device->port_data[port].cache.subnet_prefix = tprops->subnet_prefix;
1546 write_unlock_irq(&device->cache_lock);
1547
1548 if (enforce_security)
1549 ib_security_cache_change(device,
1550 port,
1551 tprops->subnet_prefix);
1552
1553 kfree(old_pkey_cache);
1554 kfree(tprops);
1555 return 0;
1556
1557err:
1558 kfree(pkey_cache);
1559 kfree(tprops);
1560 return ret;
1561}
1562
1563static void ib_cache_event_task(struct work_struct *_work)
1564{
1565 struct ib_update_work *work =
1566 container_of(_work, struct ib_update_work, work);
1567 int ret;
1568
1569 /* Before distributing the cache update event, first sync
1570 * the cache.
1571 */
1572 ret = ib_cache_update(work->event.device, work->event.element.port_num,
1573 work->event.event == IB_EVENT_GID_CHANGE,
1574 work->event.event == IB_EVENT_PKEY_CHANGE,
1575 work->enforce_security);
1576
1577 /* GID event is notified already for individual GID entries by
1578 * dispatch_gid_change_event(). Hence, notifiy for rest of the
1579 * events.
1580 */
1581 if (!ret && work->event.event != IB_EVENT_GID_CHANGE)
1582 ib_dispatch_event_clients(&work->event);
1583
1584 kfree(work);
1585}
1586
1587static void ib_generic_event_task(struct work_struct *_work)
1588{
1589 struct ib_update_work *work =
1590 container_of(_work, struct ib_update_work, work);
1591
1592 ib_dispatch_event_clients(&work->event);
1593 kfree(work);
1594}
1595
1596static bool is_cache_update_event(const struct ib_event *event)
1597{
1598 return (event->event == IB_EVENT_PORT_ERR ||
1599 event->event == IB_EVENT_PORT_ACTIVE ||
1600 event->event == IB_EVENT_LID_CHANGE ||
1601 event->event == IB_EVENT_PKEY_CHANGE ||
1602 event->event == IB_EVENT_CLIENT_REREGISTER ||
1603 event->event == IB_EVENT_GID_CHANGE);
1604}
1605
1606/**
1607 * ib_dispatch_event - Dispatch an asynchronous event
1608 * @event:Event to dispatch
1609 *
1610 * Low-level drivers must call ib_dispatch_event() to dispatch the
1611 * event to all registered event handlers when an asynchronous event
1612 * occurs.
1613 */
1614void ib_dispatch_event(const struct ib_event *event)
1615{
1616 struct ib_update_work *work;
1617
1618 work = kzalloc(sizeof(*work), GFP_ATOMIC);
1619 if (!work)
1620 return;
1621
1622 if (is_cache_update_event(event))
1623 INIT_WORK(&work->work, ib_cache_event_task);
1624 else
1625 INIT_WORK(&work->work, ib_generic_event_task);
1626
1627 work->event = *event;
1628 if (event->event == IB_EVENT_PKEY_CHANGE ||
1629 event->event == IB_EVENT_GID_CHANGE)
1630 work->enforce_security = true;
1631
1632 queue_work(ib_wq, &work->work);
1633}
1634EXPORT_SYMBOL(ib_dispatch_event);
1635
1636int ib_cache_setup_one(struct ib_device *device)
1637{
1638 u32 p;
1639 int err;
1640
1641 err = gid_table_setup_one(device);
1642 if (err)
1643 return err;
1644
1645 rdma_for_each_port (device, p) {
1646 err = ib_cache_update(device, p, true, true, true);
1647 if (err)
1648 return err;
1649 }
1650
1651 return 0;
1652}
1653
1654void ib_cache_release_one(struct ib_device *device)
1655{
1656 u32 p;
1657
1658 /*
1659 * The release function frees all the cache elements.
1660 * This function should be called as part of freeing
1661 * all the device's resources when the cache could no
1662 * longer be accessed.
1663 */
1664 rdma_for_each_port (device, p)
1665 kfree(device->port_data[p].cache.pkey);
1666
1667 gid_table_release_one(device);
1668}
1669
1670void ib_cache_cleanup_one(struct ib_device *device)
1671{
1672 /* The cleanup function waits for all in-progress workqueue
1673 * elements and cleans up the GID cache. This function should be
1674 * called after the device was removed from the devices list and
1675 * all clients were removed, so the cache exists but is
1676 * non-functional and shouldn't be updated anymore.
1677 */
1678 flush_workqueue(ib_wq);
1679 gid_table_cleanup_one(device);
1680
1681 /*
1682 * Flush the wq second time for any pending GID delete work.
1683 */
1684 flush_workqueue(ib_wq);
1685}
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
47struct ib_pkey_cache {
48 int table_len;
49 u16 table[0];
50};
51
52struct ib_update_work {
53 struct work_struct work;
54 struct ib_device *device;
55 u8 port_num;
56 bool enforce_security;
57};
58
59union ib_gid zgid;
60EXPORT_SYMBOL(zgid);
61
62enum gid_attr_find_mask {
63 GID_ATTR_FIND_MASK_GID = 1UL << 0,
64 GID_ATTR_FIND_MASK_NETDEV = 1UL << 1,
65 GID_ATTR_FIND_MASK_DEFAULT = 1UL << 2,
66 GID_ATTR_FIND_MASK_GID_TYPE = 1UL << 3,
67};
68
69enum gid_table_entry_props {
70 GID_TABLE_ENTRY_INVALID = 1UL << 0,
71 GID_TABLE_ENTRY_DEFAULT = 1UL << 1,
72};
73
74struct ib_gid_table_entry {
75 unsigned long props;
76 union ib_gid gid;
77 struct ib_gid_attr attr;
78 void *context;
79};
80
81struct ib_gid_table {
82 int sz;
83 /* In RoCE, adding a GID to the table requires:
84 * (a) Find if this GID is already exists.
85 * (b) Find a free space.
86 * (c) Write the new GID
87 *
88 * Delete requires different set of operations:
89 * (a) Find the GID
90 * (b) Delete it.
91 *
92 **/
93 /* Any writer to data_vec must hold this lock and the write side of
94 * rwlock. readers must hold only rwlock. All writers must be in a
95 * sleepable context.
96 */
97 struct mutex lock;
98 /* rwlock protects data_vec[ix]->props. */
99 rwlock_t rwlock;
100 struct ib_gid_table_entry *data_vec;
101};
102
103static void dispatch_gid_change_event(struct ib_device *ib_dev, u8 port)
104{
105 struct ib_event event;
106
107 event.device = ib_dev;
108 event.element.port_num = port;
109 event.event = IB_EVENT_GID_CHANGE;
110
111 ib_dispatch_event(&event);
112}
113
114static const char * const gid_type_str[] = {
115 [IB_GID_TYPE_IB] = "IB/RoCE v1",
116 [IB_GID_TYPE_ROCE_UDP_ENCAP] = "RoCE v2",
117};
118
119const char *ib_cache_gid_type_str(enum ib_gid_type gid_type)
120{
121 if (gid_type < ARRAY_SIZE(gid_type_str) && gid_type_str[gid_type])
122 return gid_type_str[gid_type];
123
124 return "Invalid GID type";
125}
126EXPORT_SYMBOL(ib_cache_gid_type_str);
127
128int ib_cache_gid_parse_type_str(const char *buf)
129{
130 unsigned int i;
131 size_t len;
132 int err = -EINVAL;
133
134 len = strlen(buf);
135 if (len == 0)
136 return -EINVAL;
137
138 if (buf[len - 1] == '\n')
139 len--;
140
141 for (i = 0; i < ARRAY_SIZE(gid_type_str); ++i)
142 if (gid_type_str[i] && !strncmp(buf, gid_type_str[i], len) &&
143 len == strlen(gid_type_str[i])) {
144 err = i;
145 break;
146 }
147
148 return err;
149}
150EXPORT_SYMBOL(ib_cache_gid_parse_type_str);
151
152static void del_roce_gid(struct ib_device *device, u8 port_num,
153 struct ib_gid_table *table, int ix)
154{
155 pr_debug("%s device=%s port=%d index=%d gid %pI6\n", __func__,
156 device->name, port_num, ix,
157 table->data_vec[ix].gid.raw);
158
159 if (rdma_cap_roce_gid_table(device, port_num))
160 device->del_gid(&table->data_vec[ix].attr,
161 &table->data_vec[ix].context);
162 dev_put(table->data_vec[ix].attr.ndev);
163}
164
165static int add_roce_gid(struct ib_gid_table *table,
166 const union ib_gid *gid,
167 const struct ib_gid_attr *attr)
168{
169 struct ib_gid_table_entry *entry;
170 int ix = attr->index;
171 int ret = 0;
172
173 if (!attr->ndev) {
174 pr_err("%s NULL netdev device=%s port=%d index=%d\n",
175 __func__, attr->device->name, attr->port_num,
176 attr->index);
177 return -EINVAL;
178 }
179
180 entry = &table->data_vec[ix];
181 if ((entry->props & GID_TABLE_ENTRY_INVALID) == 0) {
182 WARN(1, "GID table corruption device=%s port=%d index=%d\n",
183 attr->device->name, attr->port_num,
184 attr->index);
185 return -EINVAL;
186 }
187
188 if (rdma_cap_roce_gid_table(attr->device, attr->port_num)) {
189 ret = attr->device->add_gid(gid, attr, &entry->context);
190 if (ret) {
191 pr_err("%s GID add failed device=%s port=%d index=%d\n",
192 __func__, attr->device->name, attr->port_num,
193 attr->index);
194 goto add_err;
195 }
196 }
197 dev_hold(attr->ndev);
198
199add_err:
200 if (!ret)
201 pr_debug("%s device=%s port=%d index=%d gid %pI6\n", __func__,
202 attr->device->name, attr->port_num, ix, gid->raw);
203 return ret;
204}
205
206/**
207 * add_modify_gid - Add or modify GID table entry
208 *
209 * @table: GID table in which GID to be added or modified
210 * @gid: GID content
211 * @attr: Attributes of the GID
212 *
213 * Returns 0 on success or appropriate error code. It accepts zero
214 * GID addition for non RoCE ports for HCA's who report them as valid
215 * GID. However such zero GIDs are not added to the cache.
216 */
217static int add_modify_gid(struct ib_gid_table *table,
218 const union ib_gid *gid,
219 const struct ib_gid_attr *attr)
220{
221 int ret;
222
223 if (rdma_protocol_roce(attr->device, attr->port_num)) {
224 ret = add_roce_gid(table, gid, attr);
225 if (ret)
226 return ret;
227 } else {
228 /*
229 * Some HCA's report multiple GID entries with only one
230 * valid GID, but remaining as zero GID.
231 * So ignore such behavior for IB link layer and don't
232 * fail the call, but don't add such entry to GID cache.
233 */
234 if (!memcmp(gid, &zgid, sizeof(*gid)))
235 return 0;
236 }
237
238 lockdep_assert_held(&table->lock);
239 memcpy(&table->data_vec[attr->index].gid, gid, sizeof(*gid));
240 memcpy(&table->data_vec[attr->index].attr, attr, sizeof(*attr));
241
242 write_lock_irq(&table->rwlock);
243 table->data_vec[attr->index].props &= ~GID_TABLE_ENTRY_INVALID;
244 write_unlock_irq(&table->rwlock);
245 return 0;
246}
247
248/**
249 * del_gid - Delete GID table entry
250 *
251 * @ib_dev: IB device whose GID entry to be deleted
252 * @port: Port number of the IB device
253 * @table: GID table of the IB device for a port
254 * @ix: GID entry index to delete
255 *
256 */
257static void del_gid(struct ib_device *ib_dev, u8 port,
258 struct ib_gid_table *table, int ix)
259{
260 lockdep_assert_held(&table->lock);
261 write_lock_irq(&table->rwlock);
262 table->data_vec[ix].props |= GID_TABLE_ENTRY_INVALID;
263 write_unlock_irq(&table->rwlock);
264
265 if (rdma_protocol_roce(ib_dev, port))
266 del_roce_gid(ib_dev, port, table, ix);
267 memcpy(&table->data_vec[ix].gid, &zgid, sizeof(zgid));
268 memset(&table->data_vec[ix].attr, 0, sizeof(table->data_vec[ix].attr));
269 table->data_vec[ix].context = NULL;
270}
271
272/* rwlock should be read locked, or lock should be held */
273static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
274 const struct ib_gid_attr *val, bool default_gid,
275 unsigned long mask, int *pempty)
276{
277 int i = 0;
278 int found = -1;
279 int empty = pempty ? -1 : 0;
280
281 while (i < table->sz && (found < 0 || empty < 0)) {
282 struct ib_gid_table_entry *data = &table->data_vec[i];
283 struct ib_gid_attr *attr = &data->attr;
284 int curr_index = i;
285
286 i++;
287
288 /* find_gid() is used during GID addition where it is expected
289 * to return a free entry slot which is not duplicate.
290 * Free entry slot is requested and returned if pempty is set,
291 * so lookup free slot only if requested.
292 */
293 if (pempty && empty < 0) {
294 if (data->props & GID_TABLE_ENTRY_INVALID &&
295 (default_gid ==
296 !!(data->props & GID_TABLE_ENTRY_DEFAULT))) {
297 /*
298 * Found an invalid (free) entry; allocate it.
299 * If default GID is requested, then our
300 * found slot must be one of the DEFAULT
301 * reserved slots or we fail.
302 * This ensures that only DEFAULT reserved
303 * slots are used for default property GIDs.
304 */
305 empty = curr_index;
306 }
307 }
308
309 /*
310 * Additionally find_gid() is used to find valid entry during
311 * lookup operation, where validity needs to be checked. So
312 * find the empty entry first to continue to search for a free
313 * slot and ignore its INVALID flag.
314 */
315 if (data->props & GID_TABLE_ENTRY_INVALID)
316 continue;
317
318 if (found >= 0)
319 continue;
320
321 if (mask & GID_ATTR_FIND_MASK_GID_TYPE &&
322 attr->gid_type != val->gid_type)
323 continue;
324
325 if (mask & GID_ATTR_FIND_MASK_GID &&
326 memcmp(gid, &data->gid, sizeof(*gid)))
327 continue;
328
329 if (mask & GID_ATTR_FIND_MASK_NETDEV &&
330 attr->ndev != val->ndev)
331 continue;
332
333 if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
334 !!(data->props & GID_TABLE_ENTRY_DEFAULT) !=
335 default_gid)
336 continue;
337
338 found = curr_index;
339 }
340
341 if (pempty)
342 *pempty = empty;
343
344 return found;
345}
346
347static void make_default_gid(struct net_device *dev, union ib_gid *gid)
348{
349 gid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
350 addrconf_ifid_eui48(&gid->raw[8], dev);
351}
352
353static int __ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
354 union ib_gid *gid, struct ib_gid_attr *attr,
355 unsigned long mask, bool default_gid)
356{
357 struct ib_gid_table *table;
358 int ret = 0;
359 int empty;
360 int ix;
361
362 /* Do not allow adding zero GID in support of
363 * IB spec version 1.3 section 4.1.1 point (6) and
364 * section 12.7.10 and section 12.7.20
365 */
366 if (!memcmp(gid, &zgid, sizeof(*gid)))
367 return -EINVAL;
368
369 table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
370
371 mutex_lock(&table->lock);
372
373 ix = find_gid(table, gid, attr, default_gid, mask, &empty);
374 if (ix >= 0)
375 goto out_unlock;
376
377 if (empty < 0) {
378 ret = -ENOSPC;
379 goto out_unlock;
380 }
381 attr->device = ib_dev;
382 attr->index = empty;
383 attr->port_num = port;
384 ret = add_modify_gid(table, gid, attr);
385 if (!ret)
386 dispatch_gid_change_event(ib_dev, port);
387
388out_unlock:
389 mutex_unlock(&table->lock);
390 if (ret)
391 pr_warn("%s: unable to add gid %pI6 error=%d\n",
392 __func__, gid->raw, ret);
393 return ret;
394}
395
396int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
397 union ib_gid *gid, struct ib_gid_attr *attr)
398{
399 struct net_device *idev;
400 unsigned long mask;
401 int ret;
402
403 if (ib_dev->get_netdev) {
404 idev = ib_dev->get_netdev(ib_dev, port);
405 if (idev && attr->ndev != idev) {
406 union ib_gid default_gid;
407
408 /* Adding default GIDs in not permitted */
409 make_default_gid(idev, &default_gid);
410 if (!memcmp(gid, &default_gid, sizeof(*gid))) {
411 dev_put(idev);
412 return -EPERM;
413 }
414 }
415 if (idev)
416 dev_put(idev);
417 }
418
419 mask = GID_ATTR_FIND_MASK_GID |
420 GID_ATTR_FIND_MASK_GID_TYPE |
421 GID_ATTR_FIND_MASK_NETDEV;
422
423 ret = __ib_cache_gid_add(ib_dev, port, gid, attr, mask, false);
424 return ret;
425}
426
427static int
428_ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
429 union ib_gid *gid, struct ib_gid_attr *attr,
430 unsigned long mask, bool default_gid)
431{
432 struct ib_gid_table *table;
433 int ret = 0;
434 int ix;
435
436 table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
437
438 mutex_lock(&table->lock);
439
440 ix = find_gid(table, gid, attr, default_gid, mask, NULL);
441 if (ix < 0) {
442 ret = -EINVAL;
443 goto out_unlock;
444 }
445
446 del_gid(ib_dev, port, table, ix);
447 dispatch_gid_change_event(ib_dev, port);
448
449out_unlock:
450 mutex_unlock(&table->lock);
451 if (ret)
452 pr_debug("%s: can't delete gid %pI6 error=%d\n",
453 __func__, gid->raw, ret);
454 return ret;
455}
456
457int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
458 union ib_gid *gid, struct ib_gid_attr *attr)
459{
460 unsigned long mask = GID_ATTR_FIND_MASK_GID |
461 GID_ATTR_FIND_MASK_GID_TYPE |
462 GID_ATTR_FIND_MASK_DEFAULT |
463 GID_ATTR_FIND_MASK_NETDEV;
464
465 return _ib_cache_gid_del(ib_dev, port, gid, attr, mask, false);
466}
467
468int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
469 struct net_device *ndev)
470{
471 struct ib_gid_table *table;
472 int ix;
473 bool deleted = false;
474
475 table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
476
477 mutex_lock(&table->lock);
478
479 for (ix = 0; ix < table->sz; ix++) {
480 if (table->data_vec[ix].attr.ndev == ndev) {
481 del_gid(ib_dev, port, table, ix);
482 deleted = true;
483 }
484 }
485
486 mutex_unlock(&table->lock);
487
488 if (deleted)
489 dispatch_gid_change_event(ib_dev, port);
490
491 return 0;
492}
493
494static int __ib_cache_gid_get(struct ib_device *ib_dev, u8 port, int index,
495 union ib_gid *gid, struct ib_gid_attr *attr)
496{
497 struct ib_gid_table *table;
498
499 table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
500
501 if (index < 0 || index >= table->sz)
502 return -EINVAL;
503
504 if (table->data_vec[index].props & GID_TABLE_ENTRY_INVALID)
505 return -EINVAL;
506
507 memcpy(gid, &table->data_vec[index].gid, sizeof(*gid));
508 if (attr) {
509 memcpy(attr, &table->data_vec[index].attr, sizeof(*attr));
510 if (attr->ndev)
511 dev_hold(attr->ndev);
512 }
513
514 return 0;
515}
516
517static int _ib_cache_gid_table_find(struct ib_device *ib_dev,
518 const union ib_gid *gid,
519 const struct ib_gid_attr *val,
520 unsigned long mask,
521 u8 *port, u16 *index)
522{
523 struct ib_gid_table *table;
524 u8 p;
525 int local_index;
526 unsigned long flags;
527
528 for (p = 0; p < ib_dev->phys_port_cnt; p++) {
529 table = ib_dev->cache.ports[p].gid;
530 read_lock_irqsave(&table->rwlock, flags);
531 local_index = find_gid(table, gid, val, false, mask, NULL);
532 if (local_index >= 0) {
533 if (index)
534 *index = local_index;
535 if (port)
536 *port = p + rdma_start_port(ib_dev);
537 read_unlock_irqrestore(&table->rwlock, flags);
538 return 0;
539 }
540 read_unlock_irqrestore(&table->rwlock, flags);
541 }
542
543 return -ENOENT;
544}
545
546static int ib_cache_gid_find(struct ib_device *ib_dev,
547 const union ib_gid *gid,
548 enum ib_gid_type gid_type,
549 struct net_device *ndev, u8 *port,
550 u16 *index)
551{
552 unsigned long mask = GID_ATTR_FIND_MASK_GID |
553 GID_ATTR_FIND_MASK_GID_TYPE;
554 struct ib_gid_attr gid_attr_val = {.ndev = ndev, .gid_type = gid_type};
555
556 if (ndev)
557 mask |= GID_ATTR_FIND_MASK_NETDEV;
558
559 return _ib_cache_gid_table_find(ib_dev, gid, &gid_attr_val,
560 mask, port, index);
561}
562
563/**
564 * ib_find_cached_gid_by_port - Returns the GID table index where a specified
565 * GID value occurs. It searches for the specified GID value in the local
566 * software cache.
567 * @device: The device to query.
568 * @gid: The GID value to search for.
569 * @gid_type: The GID type to search for.
570 * @port_num: The port number of the device where the GID value should be
571 * searched.
572 * @ndev: In RoCE, the net device of the device. Null means ignore.
573 * @index: The index into the cached GID table where the GID was found. This
574 * parameter may be NULL.
575 */
576int ib_find_cached_gid_by_port(struct ib_device *ib_dev,
577 const union ib_gid *gid,
578 enum ib_gid_type gid_type,
579 u8 port, struct net_device *ndev,
580 u16 *index)
581{
582 int local_index;
583 struct ib_gid_table *table;
584 unsigned long mask = GID_ATTR_FIND_MASK_GID |
585 GID_ATTR_FIND_MASK_GID_TYPE;
586 struct ib_gid_attr val = {.ndev = ndev, .gid_type = gid_type};
587 unsigned long flags;
588
589 if (!rdma_is_port_valid(ib_dev, port))
590 return -ENOENT;
591
592 table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
593
594 if (ndev)
595 mask |= GID_ATTR_FIND_MASK_NETDEV;
596
597 read_lock_irqsave(&table->rwlock, flags);
598 local_index = find_gid(table, gid, &val, false, mask, NULL);
599 if (local_index >= 0) {
600 if (index)
601 *index = local_index;
602 read_unlock_irqrestore(&table->rwlock, flags);
603 return 0;
604 }
605
606 read_unlock_irqrestore(&table->rwlock, flags);
607 return -ENOENT;
608}
609EXPORT_SYMBOL(ib_find_cached_gid_by_port);
610
611/**
612 * ib_cache_gid_find_by_filter - Returns the GID table index where a specified
613 * GID value occurs
614 * @device: The device to query.
615 * @gid: The GID value to search for.
616 * @port_num: The port number of the device where the GID value could be
617 * searched.
618 * @filter: The filter function is executed on any matching GID in the table.
619 * If the filter function returns true, the corresponding index is returned,
620 * otherwise, we continue searching the GID table. It's guaranteed that
621 * while filter is executed, ndev field is valid and the structure won't
622 * change. filter is executed in an atomic context. filter must not be NULL.
623 * @index: The index into the cached GID table where the GID was found. This
624 * parameter may be NULL.
625 *
626 * ib_cache_gid_find_by_filter() searches for the specified GID value
627 * of which the filter function returns true in the port's GID table.
628 * This function is only supported on RoCE ports.
629 *
630 */
631static int ib_cache_gid_find_by_filter(struct ib_device *ib_dev,
632 const union ib_gid *gid,
633 u8 port,
634 bool (*filter)(const union ib_gid *,
635 const struct ib_gid_attr *,
636 void *),
637 void *context,
638 u16 *index)
639{
640 struct ib_gid_table *table;
641 unsigned int i;
642 unsigned long flags;
643 bool found = false;
644
645
646 if (!rdma_is_port_valid(ib_dev, port) ||
647 !rdma_protocol_roce(ib_dev, port))
648 return -EPROTONOSUPPORT;
649
650 table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
651
652 read_lock_irqsave(&table->rwlock, flags);
653 for (i = 0; i < table->sz; i++) {
654 struct ib_gid_attr attr;
655
656 if (table->data_vec[i].props & GID_TABLE_ENTRY_INVALID)
657 continue;
658
659 if (memcmp(gid, &table->data_vec[i].gid, sizeof(*gid)))
660 continue;
661
662 memcpy(&attr, &table->data_vec[i].attr, sizeof(attr));
663
664 if (filter(gid, &attr, context)) {
665 found = true;
666 if (index)
667 *index = i;
668 break;
669 }
670 }
671 read_unlock_irqrestore(&table->rwlock, flags);
672
673 if (!found)
674 return -ENOENT;
675 return 0;
676}
677
678static struct ib_gid_table *alloc_gid_table(int sz)
679{
680 struct ib_gid_table *table =
681 kzalloc(sizeof(struct ib_gid_table), GFP_KERNEL);
682 int i;
683
684 if (!table)
685 return NULL;
686
687 table->data_vec = kcalloc(sz, sizeof(*table->data_vec), GFP_KERNEL);
688 if (!table->data_vec)
689 goto err_free_table;
690
691 mutex_init(&table->lock);
692
693 table->sz = sz;
694 rwlock_init(&table->rwlock);
695
696 /* Mark all entries as invalid so that allocator can allocate
697 * one of the invalid (free) entry.
698 */
699 for (i = 0; i < sz; i++)
700 table->data_vec[i].props |= GID_TABLE_ENTRY_INVALID;
701 return table;
702
703err_free_table:
704 kfree(table);
705 return NULL;
706}
707
708static void release_gid_table(struct ib_gid_table *table)
709{
710 if (table) {
711 kfree(table->data_vec);
712 kfree(table);
713 }
714}
715
716static void cleanup_gid_table_port(struct ib_device *ib_dev, u8 port,
717 struct ib_gid_table *table)
718{
719 int i;
720 bool deleted = false;
721
722 if (!table)
723 return;
724
725 mutex_lock(&table->lock);
726 for (i = 0; i < table->sz; ++i) {
727 if (memcmp(&table->data_vec[i].gid, &zgid,
728 sizeof(table->data_vec[i].gid))) {
729 del_gid(ib_dev, port, table, i);
730 deleted = true;
731 }
732 }
733 mutex_unlock(&table->lock);
734
735 if (deleted)
736 dispatch_gid_change_event(ib_dev, port);
737}
738
739void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
740 struct net_device *ndev,
741 unsigned long gid_type_mask,
742 enum ib_cache_gid_default_mode mode)
743{
744 union ib_gid gid = { };
745 struct ib_gid_attr gid_attr;
746 struct ib_gid_table *table;
747 unsigned int gid_type;
748 unsigned long mask;
749
750 table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
751
752 mask = GID_ATTR_FIND_MASK_GID_TYPE |
753 GID_ATTR_FIND_MASK_DEFAULT |
754 GID_ATTR_FIND_MASK_NETDEV;
755 memset(&gid_attr, 0, sizeof(gid_attr));
756 gid_attr.ndev = ndev;
757
758 for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) {
759 if (1UL << gid_type & ~gid_type_mask)
760 continue;
761
762 gid_attr.gid_type = gid_type;
763
764 if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) {
765 make_default_gid(ndev, &gid);
766 __ib_cache_gid_add(ib_dev, port, &gid,
767 &gid_attr, mask, true);
768 } else if (mode == IB_CACHE_GID_DEFAULT_MODE_DELETE) {
769 _ib_cache_gid_del(ib_dev, port, &gid,
770 &gid_attr, mask, true);
771 }
772 }
773}
774
775static int gid_table_reserve_default(struct ib_device *ib_dev, u8 port,
776 struct ib_gid_table *table)
777{
778 unsigned int i;
779 unsigned long roce_gid_type_mask;
780 unsigned int num_default_gids;
781 unsigned int current_gid = 0;
782
783 roce_gid_type_mask = roce_gid_type_mask_support(ib_dev, port);
784 num_default_gids = hweight_long(roce_gid_type_mask);
785 for (i = 0; i < num_default_gids && i < table->sz; i++) {
786 struct ib_gid_table_entry *entry =
787 &table->data_vec[i];
788
789 entry->props |= GID_TABLE_ENTRY_DEFAULT;
790 current_gid = find_next_bit(&roce_gid_type_mask,
791 BITS_PER_LONG,
792 current_gid);
793 entry->attr.gid_type = current_gid++;
794 }
795
796 return 0;
797}
798
799static int _gid_table_setup_one(struct ib_device *ib_dev)
800{
801 u8 port;
802 struct ib_gid_table *table;
803 int err = 0;
804
805 for (port = 0; port < ib_dev->phys_port_cnt; port++) {
806 u8 rdma_port = port + rdma_start_port(ib_dev);
807
808 table =
809 alloc_gid_table(
810 ib_dev->port_immutable[rdma_port].gid_tbl_len);
811 if (!table) {
812 err = -ENOMEM;
813 goto rollback_table_setup;
814 }
815
816 err = gid_table_reserve_default(ib_dev,
817 port + rdma_start_port(ib_dev),
818 table);
819 if (err)
820 goto rollback_table_setup;
821 ib_dev->cache.ports[port].gid = table;
822 }
823
824 return 0;
825
826rollback_table_setup:
827 for (port = 0; port < ib_dev->phys_port_cnt; port++) {
828 table = ib_dev->cache.ports[port].gid;
829
830 cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
831 table);
832 release_gid_table(table);
833 }
834
835 return err;
836}
837
838static void gid_table_release_one(struct ib_device *ib_dev)
839{
840 struct ib_gid_table *table;
841 u8 port;
842
843 for (port = 0; port < ib_dev->phys_port_cnt; port++) {
844 table = ib_dev->cache.ports[port].gid;
845 release_gid_table(table);
846 ib_dev->cache.ports[port].gid = NULL;
847 }
848}
849
850static void gid_table_cleanup_one(struct ib_device *ib_dev)
851{
852 struct ib_gid_table *table;
853 u8 port;
854
855 for (port = 0; port < ib_dev->phys_port_cnt; port++) {
856 table = ib_dev->cache.ports[port].gid;
857 cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
858 table);
859 }
860}
861
862static int gid_table_setup_one(struct ib_device *ib_dev)
863{
864 int err;
865
866 err = _gid_table_setup_one(ib_dev);
867
868 if (err)
869 return err;
870
871 rdma_roce_rescan_device(ib_dev);
872
873 return err;
874}
875
876int ib_get_cached_gid(struct ib_device *device,
877 u8 port_num,
878 int index,
879 union ib_gid *gid,
880 struct ib_gid_attr *gid_attr)
881{
882 int res;
883 unsigned long flags;
884 struct ib_gid_table *table;
885
886 if (!rdma_is_port_valid(device, port_num))
887 return -EINVAL;
888
889 table = device->cache.ports[port_num - rdma_start_port(device)].gid;
890 read_lock_irqsave(&table->rwlock, flags);
891 res = __ib_cache_gid_get(device, port_num, index, gid, gid_attr);
892 read_unlock_irqrestore(&table->rwlock, flags);
893
894 return res;
895}
896EXPORT_SYMBOL(ib_get_cached_gid);
897
898/**
899 * ib_find_cached_gid - Returns the port number and GID table index where
900 * a specified GID value occurs.
901 * @device: The device to query.
902 * @gid: The GID value to search for.
903 * @gid_type: The GID type to search for.
904 * @ndev: In RoCE, the net device of the device. NULL means ignore.
905 * @port_num: The port number of the device where the GID value was found.
906 * @index: The index into the cached GID table where the GID was found. This
907 * parameter may be NULL.
908 *
909 * ib_find_cached_gid() searches for the specified GID value in
910 * the local software cache.
911 */
912int ib_find_cached_gid(struct ib_device *device,
913 const union ib_gid *gid,
914 enum ib_gid_type gid_type,
915 struct net_device *ndev,
916 u8 *port_num,
917 u16 *index)
918{
919 return ib_cache_gid_find(device, gid, gid_type, ndev, port_num, index);
920}
921EXPORT_SYMBOL(ib_find_cached_gid);
922
923int ib_find_gid_by_filter(struct ib_device *device,
924 const union ib_gid *gid,
925 u8 port_num,
926 bool (*filter)(const union ib_gid *gid,
927 const struct ib_gid_attr *,
928 void *),
929 void *context, u16 *index)
930{
931 /* Only RoCE GID table supports filter function */
932 if (!rdma_protocol_roce(device, port_num) && filter)
933 return -EPROTONOSUPPORT;
934
935 return ib_cache_gid_find_by_filter(device, gid,
936 port_num, filter,
937 context, index);
938}
939
940int ib_get_cached_pkey(struct ib_device *device,
941 u8 port_num,
942 int index,
943 u16 *pkey)
944{
945 struct ib_pkey_cache *cache;
946 unsigned long flags;
947 int ret = 0;
948
949 if (!rdma_is_port_valid(device, port_num))
950 return -EINVAL;
951
952 read_lock_irqsave(&device->cache.lock, flags);
953
954 cache = device->cache.ports[port_num - rdma_start_port(device)].pkey;
955
956 if (index < 0 || index >= cache->table_len)
957 ret = -EINVAL;
958 else
959 *pkey = cache->table[index];
960
961 read_unlock_irqrestore(&device->cache.lock, flags);
962
963 return ret;
964}
965EXPORT_SYMBOL(ib_get_cached_pkey);
966
967int ib_get_cached_subnet_prefix(struct ib_device *device,
968 u8 port_num,
969 u64 *sn_pfx)
970{
971 unsigned long flags;
972 int p;
973
974 if (!rdma_is_port_valid(device, port_num))
975 return -EINVAL;
976
977 p = port_num - rdma_start_port(device);
978 read_lock_irqsave(&device->cache.lock, flags);
979 *sn_pfx = device->cache.ports[p].subnet_prefix;
980 read_unlock_irqrestore(&device->cache.lock, flags);
981
982 return 0;
983}
984EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
985
986int ib_find_cached_pkey(struct ib_device *device,
987 u8 port_num,
988 u16 pkey,
989 u16 *index)
990{
991 struct ib_pkey_cache *cache;
992 unsigned long flags;
993 int i;
994 int ret = -ENOENT;
995 int partial_ix = -1;
996
997 if (!rdma_is_port_valid(device, port_num))
998 return -EINVAL;
999
1000 read_lock_irqsave(&device->cache.lock, flags);
1001
1002 cache = device->cache.ports[port_num - rdma_start_port(device)].pkey;
1003
1004 *index = -1;
1005
1006 for (i = 0; i < cache->table_len; ++i)
1007 if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
1008 if (cache->table[i] & 0x8000) {
1009 *index = i;
1010 ret = 0;
1011 break;
1012 } else
1013 partial_ix = i;
1014 }
1015
1016 if (ret && partial_ix >= 0) {
1017 *index = partial_ix;
1018 ret = 0;
1019 }
1020
1021 read_unlock_irqrestore(&device->cache.lock, flags);
1022
1023 return ret;
1024}
1025EXPORT_SYMBOL(ib_find_cached_pkey);
1026
1027int ib_find_exact_cached_pkey(struct ib_device *device,
1028 u8 port_num,
1029 u16 pkey,
1030 u16 *index)
1031{
1032 struct ib_pkey_cache *cache;
1033 unsigned long flags;
1034 int i;
1035 int ret = -ENOENT;
1036
1037 if (!rdma_is_port_valid(device, port_num))
1038 return -EINVAL;
1039
1040 read_lock_irqsave(&device->cache.lock, flags);
1041
1042 cache = device->cache.ports[port_num - rdma_start_port(device)].pkey;
1043
1044 *index = -1;
1045
1046 for (i = 0; i < cache->table_len; ++i)
1047 if (cache->table[i] == pkey) {
1048 *index = i;
1049 ret = 0;
1050 break;
1051 }
1052
1053 read_unlock_irqrestore(&device->cache.lock, flags);
1054
1055 return ret;
1056}
1057EXPORT_SYMBOL(ib_find_exact_cached_pkey);
1058
1059int ib_get_cached_lmc(struct ib_device *device,
1060 u8 port_num,
1061 u8 *lmc)
1062{
1063 unsigned long flags;
1064 int ret = 0;
1065
1066 if (!rdma_is_port_valid(device, port_num))
1067 return -EINVAL;
1068
1069 read_lock_irqsave(&device->cache.lock, flags);
1070 *lmc = device->cache.ports[port_num - rdma_start_port(device)].lmc;
1071 read_unlock_irqrestore(&device->cache.lock, flags);
1072
1073 return ret;
1074}
1075EXPORT_SYMBOL(ib_get_cached_lmc);
1076
1077int ib_get_cached_port_state(struct ib_device *device,
1078 u8 port_num,
1079 enum ib_port_state *port_state)
1080{
1081 unsigned long flags;
1082 int ret = 0;
1083
1084 if (!rdma_is_port_valid(device, port_num))
1085 return -EINVAL;
1086
1087 read_lock_irqsave(&device->cache.lock, flags);
1088 *port_state = device->cache.ports[port_num
1089 - rdma_start_port(device)].port_state;
1090 read_unlock_irqrestore(&device->cache.lock, flags);
1091
1092 return ret;
1093}
1094EXPORT_SYMBOL(ib_get_cached_port_state);
1095
1096static int config_non_roce_gid_cache(struct ib_device *device,
1097 u8 port, int gid_tbl_len)
1098{
1099 struct ib_gid_attr gid_attr = {};
1100 struct ib_gid_table *table;
1101 union ib_gid gid;
1102 int ret = 0;
1103 int i;
1104
1105 gid_attr.device = device;
1106 gid_attr.port_num = port;
1107 table = device->cache.ports[port - rdma_start_port(device)].gid;
1108
1109 mutex_lock(&table->lock);
1110 for (i = 0; i < gid_tbl_len; ++i) {
1111 if (!device->query_gid)
1112 continue;
1113 ret = device->query_gid(device, port, i, &gid);
1114 if (ret) {
1115 pr_warn("query_gid failed (%d) for %s (index %d)\n",
1116 ret, device->name, i);
1117 goto err;
1118 }
1119 gid_attr.index = i;
1120 add_modify_gid(table, &gid, &gid_attr);
1121 }
1122err:
1123 mutex_unlock(&table->lock);
1124 return ret;
1125}
1126
1127static void ib_cache_update(struct ib_device *device,
1128 u8 port,
1129 bool enforce_security)
1130{
1131 struct ib_port_attr *tprops = NULL;
1132 struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache;
1133 int i;
1134 int ret;
1135 struct ib_gid_table *table;
1136
1137 if (!rdma_is_port_valid(device, port))
1138 return;
1139
1140 table = device->cache.ports[port - rdma_start_port(device)].gid;
1141
1142 tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
1143 if (!tprops)
1144 return;
1145
1146 ret = ib_query_port(device, port, tprops);
1147 if (ret) {
1148 pr_warn("ib_query_port failed (%d) for %s\n",
1149 ret, device->name);
1150 goto err;
1151 }
1152
1153 if (!rdma_protocol_roce(device, port)) {
1154 ret = config_non_roce_gid_cache(device, port,
1155 tprops->gid_tbl_len);
1156 if (ret)
1157 goto err;
1158 }
1159
1160 pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
1161 sizeof *pkey_cache->table, GFP_KERNEL);
1162 if (!pkey_cache)
1163 goto err;
1164
1165 pkey_cache->table_len = tprops->pkey_tbl_len;
1166
1167 for (i = 0; i < pkey_cache->table_len; ++i) {
1168 ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
1169 if (ret) {
1170 pr_warn("ib_query_pkey failed (%d) for %s (index %d)\n",
1171 ret, device->name, i);
1172 goto err;
1173 }
1174 }
1175
1176 write_lock_irq(&device->cache.lock);
1177
1178 old_pkey_cache = device->cache.ports[port -
1179 rdma_start_port(device)].pkey;
1180
1181 device->cache.ports[port - rdma_start_port(device)].pkey = pkey_cache;
1182 device->cache.ports[port - rdma_start_port(device)].lmc = tprops->lmc;
1183 device->cache.ports[port - rdma_start_port(device)].port_state =
1184 tprops->state;
1185
1186 device->cache.ports[port - rdma_start_port(device)].subnet_prefix =
1187 tprops->subnet_prefix;
1188 write_unlock_irq(&device->cache.lock);
1189
1190 if (enforce_security)
1191 ib_security_cache_change(device,
1192 port,
1193 tprops->subnet_prefix);
1194
1195 kfree(old_pkey_cache);
1196 kfree(tprops);
1197 return;
1198
1199err:
1200 kfree(pkey_cache);
1201 kfree(tprops);
1202}
1203
1204static void ib_cache_task(struct work_struct *_work)
1205{
1206 struct ib_update_work *work =
1207 container_of(_work, struct ib_update_work, work);
1208
1209 ib_cache_update(work->device,
1210 work->port_num,
1211 work->enforce_security);
1212 kfree(work);
1213}
1214
1215static void ib_cache_event(struct ib_event_handler *handler,
1216 struct ib_event *event)
1217{
1218 struct ib_update_work *work;
1219
1220 if (event->event == IB_EVENT_PORT_ERR ||
1221 event->event == IB_EVENT_PORT_ACTIVE ||
1222 event->event == IB_EVENT_LID_CHANGE ||
1223 event->event == IB_EVENT_PKEY_CHANGE ||
1224 event->event == IB_EVENT_SM_CHANGE ||
1225 event->event == IB_EVENT_CLIENT_REREGISTER ||
1226 event->event == IB_EVENT_GID_CHANGE) {
1227 work = kmalloc(sizeof *work, GFP_ATOMIC);
1228 if (work) {
1229 INIT_WORK(&work->work, ib_cache_task);
1230 work->device = event->device;
1231 work->port_num = event->element.port_num;
1232 if (event->event == IB_EVENT_PKEY_CHANGE ||
1233 event->event == IB_EVENT_GID_CHANGE)
1234 work->enforce_security = true;
1235 else
1236 work->enforce_security = false;
1237
1238 queue_work(ib_wq, &work->work);
1239 }
1240 }
1241}
1242
1243int ib_cache_setup_one(struct ib_device *device)
1244{
1245 int p;
1246 int err;
1247
1248 rwlock_init(&device->cache.lock);
1249
1250 device->cache.ports =
1251 kzalloc(sizeof(*device->cache.ports) *
1252 (rdma_end_port(device) - rdma_start_port(device) + 1), GFP_KERNEL);
1253 if (!device->cache.ports)
1254 return -ENOMEM;
1255
1256 err = gid_table_setup_one(device);
1257 if (err) {
1258 kfree(device->cache.ports);
1259 device->cache.ports = NULL;
1260 return err;
1261 }
1262
1263 for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p)
1264 ib_cache_update(device, p + rdma_start_port(device), true);
1265
1266 INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
1267 device, ib_cache_event);
1268 ib_register_event_handler(&device->cache.event_handler);
1269 return 0;
1270}
1271
1272void ib_cache_release_one(struct ib_device *device)
1273{
1274 int p;
1275
1276 /*
1277 * The release function frees all the cache elements.
1278 * This function should be called as part of freeing
1279 * all the device's resources when the cache could no
1280 * longer be accessed.
1281 */
1282 for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p)
1283 kfree(device->cache.ports[p].pkey);
1284
1285 gid_table_release_one(device);
1286 kfree(device->cache.ports);
1287}
1288
1289void ib_cache_cleanup_one(struct ib_device *device)
1290{
1291 /* The cleanup function unregisters the event handler,
1292 * waits for all in-progress workqueue elements and cleans
1293 * up the GID cache. This function should be called after
1294 * the device was removed from the devices list and all
1295 * clients were removed, so the cache exists but is
1296 * non-functional and shouldn't be updated anymore.
1297 */
1298 ib_unregister_event_handler(&device->cache.event_handler);
1299 flush_workqueue(ib_wq);
1300 gid_table_cleanup_one(device);
1301}
1302
1303void __init ib_cache_setup(void)
1304{
1305 roce_gid_mgmt_init();
1306}
1307
1308void __exit ib_cache_cleanup(void)
1309{
1310 roce_gid_mgmt_cleanup();
1311}