projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'drm-dwhdmi-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into...
[linux-2.6-block.git] / drivers / infiniband / core / iwpm_util.c
CommitLineData
30dc5e63
TN		 1/*
2 * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
3 * Copyright (c) 2014 Intel Corporation. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include "iwpm_util.h"
35
36#define IWPM_HASH_BUCKET_SIZE 512
37#define IWPM_HASH_BUCKET_MASK (IWPM_HASH_BUCKET_SIZE - 1)
38
39static LIST_HEAD(iwpm_nlmsg_req_list);
40static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
41
42static struct hlist_head *iwpm_hash_bucket;
43static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
44
45static DEFINE_MUTEX(iwpm_admin_lock);
46static struct iwpm_admin_data iwpm_admin;
47
48int iwpm_init(u8 nl_client)
49{
50 if (iwpm_valid_client(nl_client))
51 return -EINVAL;
52 mutex_lock(&iwpm_admin_lock);
53 if (atomic_read(&iwpm_admin.refcount) == 0) {
54 iwpm_hash_bucket = kzalloc(IWPM_HASH_BUCKET_SIZE *
55 sizeof(struct hlist_head), GFP_KERNEL);
56 if (!iwpm_hash_bucket) {
57 mutex_unlock(&iwpm_admin_lock);
58 pr_err("%s Unable to create mapinfo hash table\n", __func__);
59 return -ENOMEM;
60 }
61 }
62 atomic_inc(&iwpm_admin.refcount);
63 mutex_unlock(&iwpm_admin_lock);
64 iwpm_set_valid(nl_client, 1);
65 return 0;
66}
67EXPORT_SYMBOL(iwpm_init);
68
69static void free_hash_bucket(void);
70
71int iwpm_exit(u8 nl_client)
72{
73
74 if (!iwpm_valid_client(nl_client))
75 return -EINVAL;
76 mutex_lock(&iwpm_admin_lock);
77 if (atomic_read(&iwpm_admin.refcount) == 0) {
78 mutex_unlock(&iwpm_admin_lock);
79 pr_err("%s Incorrect usage - negative refcount\n", __func__);
80 return -EINVAL;
81 }
82 if (atomic_dec_and_test(&iwpm_admin.refcount)) {
83 free_hash_bucket();
84 pr_debug("%s: Mapinfo hash table is destroyed\n", __func__);
85 }
86 mutex_unlock(&iwpm_admin_lock);
87 iwpm_set_valid(nl_client, 0);
88 return 0;
89}
90EXPORT_SYMBOL(iwpm_exit);
91
92static struct hlist_head *get_hash_bucket_head(struct sockaddr_storage *,
93 struct sockaddr_storage *);
94
95int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
96 struct sockaddr_storage *mapped_sockaddr,
97 u8 nl_client)
98{
99 struct hlist_head *hash_bucket_head;
100 struct iwpm_mapping_info *map_info;
101 unsigned long flags;
102
103 if (!iwpm_valid_client(nl_client))
104 return -EINVAL;
105 map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
106 if (!map_info) {
107 pr_err("%s: Unable to allocate a mapping info\n", __func__);
108 return -ENOMEM;
109 }
110 memcpy(&map_info->local_sockaddr, local_sockaddr,
111 sizeof(struct sockaddr_storage));
112 memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
113 sizeof(struct sockaddr_storage));
114 map_info->nl_client = nl_client;
115
116 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
117 if (iwpm_hash_bucket) {
118 hash_bucket_head = get_hash_bucket_head(
119 &map_info->local_sockaddr,
120 &map_info->mapped_sockaddr);
121 hlist_add_head(&map_info->hlist_node, hash_bucket_head);
122 }
123 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
124 return 0;
125}
126EXPORT_SYMBOL(iwpm_create_mapinfo);
127
128int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
129 struct sockaddr_storage *mapped_local_addr)
130{
131 struct hlist_node *tmp_hlist_node;
132 struct hlist_head *hash_bucket_head;
133 struct iwpm_mapping_info *map_info = NULL;
134 unsigned long flags;
135 int ret = -EINVAL;
136
137 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
138 if (iwpm_hash_bucket) {
139 hash_bucket_head = get_hash_bucket_head(
140 local_sockaddr,
141 mapped_local_addr);
142 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
143 hash_bucket_head, hlist_node) {
144
145 if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
146 mapped_local_addr)) {
147
148 hlist_del_init(&map_info->hlist_node);
149 kfree(map_info);
150 ret = 0;
151 break;
152 }
153 }
154 }
155 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
156 return ret;
157}
158EXPORT_SYMBOL(iwpm_remove_mapinfo);
159
160static void free_hash_bucket(void)
161{
162 struct hlist_node *tmp_hlist_node;
163 struct iwpm_mapping_info *map_info;
164 unsigned long flags;
165 int i;
166
167 /* remove all the mapinfo data from the list */
168 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
169 for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) {
170 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
171 &iwpm_hash_bucket[i], hlist_node) {
172
173 hlist_del_init(&map_info->hlist_node);
174 kfree(map_info);
175 }
176 }
177 /* free the hash list */
178 kfree(iwpm_hash_bucket);
179 iwpm_hash_bucket = NULL;
180 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
181}
182
183struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
184 u8 nl_client, gfp_t gfp)
185{
186 struct iwpm_nlmsg_request *nlmsg_request = NULL;
187 unsigned long flags;
188
189 nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
190 if (!nlmsg_request) {
191 pr_err("%s Unable to allocate a nlmsg_request\n", __func__);
192 return NULL;
193 }
194 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
195 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
196 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
197
198 kref_init(&nlmsg_request->kref);
199 kref_get(&nlmsg_request->kref);
200 nlmsg_request->nlmsg_seq = nlmsg_seq;
201 nlmsg_request->nl_client = nl_client;
202 nlmsg_request->request_done = 0;
203 nlmsg_request->err_code = 0;
204 return nlmsg_request;
205}
206
207void iwpm_free_nlmsg_request(struct kref *kref)
208{
209 struct iwpm_nlmsg_request *nlmsg_request;
210 unsigned long flags;
211
212 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
213
214 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
215 list_del_init(&nlmsg_request->inprocess_list);
216 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
217
218 if (!nlmsg_request->request_done)
219 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
220 __func__, nlmsg_request->nlmsg_seq);
221 kfree(nlmsg_request);
222}
223
224struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
225{
226 struct iwpm_nlmsg_request *nlmsg_request;
227 struct iwpm_nlmsg_request *found_request = NULL;
228 unsigned long flags;
229
230 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
231 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
232 inprocess_list) {
233 if (nlmsg_request->nlmsg_seq == echo_seq) {
234 found_request = nlmsg_request;
235 kref_get(&nlmsg_request->kref);
236 break;
237 }
238 }
239 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
240 return found_request;
241}
242
243int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
244{
245 int ret;
246 init_waitqueue_head(&nlmsg_request->waitq);
247
248 ret = wait_event_timeout(nlmsg_request->waitq,
249 (nlmsg_request->request_done != 0), IWPM_NL_TIMEOUT);
250 if (!ret) {
251 ret = -EINVAL;
252 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
253 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
254 } else {
255 ret = nlmsg_request->err_code;
256 }
257 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
258 return ret;
259}
260
261int iwpm_get_nlmsg_seq(void)
262{
263 return atomic_inc_return(&iwpm_admin.nlmsg_seq);
264}
265
266int iwpm_valid_client(u8 nl_client)
267{
268 if (nl_client >= RDMA_NL_NUM_CLIENTS)
269 return 0;
270 return iwpm_admin.client_list[nl_client];
271}
272
273void iwpm_set_valid(u8 nl_client, int valid)
274{
275 if (nl_client >= RDMA_NL_NUM_CLIENTS)
276 return;
277 iwpm_admin.client_list[nl_client] = valid;
278}
279
280/* valid client */
281int iwpm_registered_client(u8 nl_client)
282{
283 return iwpm_admin.reg_list[nl_client];
284}
285
286/* valid client */
287void iwpm_set_registered(u8 nl_client, int reg)
288{
289 iwpm_admin.reg_list[nl_client] = reg;
290}
291
292int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
293 struct sockaddr_storage *b_sockaddr)
294{
295 if (a_sockaddr->ss_family != b_sockaddr->ss_family)
296 return 1;
297 if (a_sockaddr->ss_family == AF_INET) {
298 struct sockaddr_in *a4_sockaddr =
299 (struct sockaddr_in *)a_sockaddr;
300 struct sockaddr_in *b4_sockaddr =
301 (struct sockaddr_in *)b_sockaddr;
302 if (!memcmp(&a4_sockaddr->sin_addr,
303 &b4_sockaddr->sin_addr, sizeof(struct in_addr))
304 && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
305 return 0;
306
307 } else if (a_sockaddr->ss_family == AF_INET6) {
308 struct sockaddr_in6 *a6_sockaddr =
309 (struct sockaddr_in6 *)a_sockaddr;
310 struct sockaddr_in6 *b6_sockaddr =
311 (struct sockaddr_in6 *)b_sockaddr;
312 if (!memcmp(&a6_sockaddr->sin6_addr,
313 &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
314 && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
315 return 0;
316
317 } else {
318 pr_err("%s: Invalid sockaddr family\n", __func__);
319 }
320 return 1;
321}
322
323struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
324 int nl_client)
325{
326 struct sk_buff *skb = NULL;
327
328 skb = dev_alloc_skb(NLMSG_GOODSIZE);
329 if (!skb) {
330 pr_err("%s Unable to allocate skb\n", __func__);
331 goto create_nlmsg_exit;
332 }
333 if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
334 NLM_F_REQUEST))) {
335 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
336 dev_kfree_skb(skb);
337 skb = NULL;
338 }
339create_nlmsg_exit:
340 return skb;
341}
342
343int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
344 const struct nla_policy *nlmsg_policy,
345 struct nlattr *nltb[], const char *msg_type)
346{
347 int nlh_len = 0;
348 int ret;
349 const char *err_str = "";
350
351 ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
352 if (ret) {
353 err_str = "Invalid attribute";
354 goto parse_nlmsg_error;
355 }
356 ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
357 if (ret) {
358 err_str = "Unable to parse the nlmsg";
359 goto parse_nlmsg_error;
360 }
361 ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
362 if (ret) {
363 err_str = "Invalid NULL attribute";
364 goto parse_nlmsg_error;
365 }
366 return 0;
367parse_nlmsg_error:
368 pr_warn("%s: %s (msg type %s ret = %d)\n",
369 __func__, err_str, msg_type, ret);
370 return ret;
371}
372
373void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
374{
375 struct sockaddr_in6 *sockaddr_v6;
376 struct sockaddr_in *sockaddr_v4;
377
378 switch (sockaddr->ss_family) {
379 case AF_INET:
380 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
381 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
382 msg, &sockaddr_v4->sin_addr,
383 ntohs(sockaddr_v4->sin_port),
384 ntohs(sockaddr_v4->sin_port));
385 break;
386 case AF_INET6:
387 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
388 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
389 msg, &sockaddr_v6->sin6_addr,
390 ntohs(sockaddr_v6->sin6_port),
391 ntohs(sockaddr_v6->sin6_port));
392 break;
393 default:
394 break;
395 }
396}
397
398static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
399{
400 u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
401 u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
402 return hash;
403}
404
405static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
406{
407 u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
408 u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
409 return hash;
410}
411
412static struct hlist_head *get_hash_bucket_head(struct sockaddr_storage
413 *local_sockaddr,
414 struct sockaddr_storage
415 *mapped_sockaddr)
416{
417 u32 local_hash, mapped_hash, hash;
418
419 if (local_sockaddr->ss_family == AF_INET) {
420 local_hash = iwpm_ipv4_jhash((struct sockaddr_in *) local_sockaddr);
421 mapped_hash = iwpm_ipv4_jhash((struct sockaddr_in *) mapped_sockaddr);
422
423 } else if (local_sockaddr->ss_family == AF_INET6) {
424 local_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) local_sockaddr);
425 mapped_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) mapped_sockaddr);
426 } else {
427 pr_err("%s: Invalid sockaddr family\n", __func__);
428 return NULL;
429 }
430
431 if (local_hash == mapped_hash) /* if port mapper isn't available */
432 hash = local_hash;
433 else
434 hash = jhash_2words(local_hash, mapped_hash, 0);
435
436 return &iwpm_hash_bucket[hash & IWPM_HASH_BUCKET_MASK];
437}
438
439static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
440{
441 struct sk_buff *skb = NULL;
442 struct nlmsghdr *nlh;
443 u32 msg_seq;
444 const char *err_str = "";
445 int ret = -EINVAL;
446
447 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
448 if (!skb) {
449 err_str = "Unable to create a nlmsg";
450 goto mapinfo_num_error;
451 }
452 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
453 msg_seq = 0;
454 err_str = "Unable to put attribute of mapinfo number nlmsg";
455 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
456 if (ret)
457 goto mapinfo_num_error;
458 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
459 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
460 if (ret)
461 goto mapinfo_num_error;
462 ret = ibnl_unicast(skb, nlh, iwpm_pid);
463 if (ret) {
464 skb = NULL;
465 err_str = "Unable to send a nlmsg";
466 goto mapinfo_num_error;
467 }
468 pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
469 return 0;
470mapinfo_num_error:
471 pr_info("%s: %s\n", __func__, err_str);
472 if (skb)
473 dev_kfree_skb(skb);
474 return ret;
475}
476
477static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
478{
479 struct nlmsghdr *nlh = NULL;
480 int ret = 0;
481
482 if (!skb)
483 return ret;
484 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
485 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
486 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
487 return -ENOMEM;
488 }
489 nlh->nlmsg_type = NLMSG_DONE;
490 ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, iwpm_pid);
491 if (ret)
492 pr_warn("%s Unable to send a nlmsg\n", __func__);
493 return ret;
494}
495
496int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
497{
498 struct iwpm_mapping_info *map_info;
499 struct sk_buff *skb = NULL;
500 struct nlmsghdr *nlh;
501 int skb_num = 0, mapping_num = 0;
502 int i = 0, nlmsg_bytes = 0;
503 unsigned long flags;
504 const char *err_str = "";
505 int ret;
506
507 skb = dev_alloc_skb(NLMSG_GOODSIZE);
508 if (!skb) {
509 ret = -ENOMEM;
510 err_str = "Unable to allocate skb";
511 goto send_mapping_info_exit;
512 }
513 skb_num++;
514 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
515 for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) {
516 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
517 hlist_node) {
518 if (map_info->nl_client != nl_client)
519 continue;
520 nlh = NULL;
521 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
522 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
523 ret = -ENOMEM;
524 err_str = "Unable to put the nlmsg header";
525 goto send_mapping_info_unlock;
526 }
527 err_str = "Unable to put attribute of the nlmsg";
528 ret = ibnl_put_attr(skb, nlh,
529 sizeof(struct sockaddr_storage),
530 &map_info->local_sockaddr,
531 IWPM_NLA_MAPINFO_LOCAL_ADDR);
532 if (ret)
533 goto send_mapping_info_unlock;
534
535 ret = ibnl_put_attr(skb, nlh,
536 sizeof(struct sockaddr_storage),
537 &map_info->mapped_sockaddr,
538 IWPM_NLA_MAPINFO_MAPPED_ADDR);
539 if (ret)
540 goto send_mapping_info_unlock;
541
542 iwpm_print_sockaddr(&map_info->local_sockaddr,
543 "send_mapping_info: Local sockaddr:");
544 iwpm_print_sockaddr(&map_info->mapped_sockaddr,
545 "send_mapping_info: Mapped local sockaddr:");
546 mapping_num++;
547 nlmsg_bytes += nlh->nlmsg_len;
548
549 /* check if all mappings can fit in one skb */
550 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
551 /* and leave room for NLMSG_DONE */
552 nlmsg_bytes = 0;
553 skb_num++;
554 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
555 flags);
556 /* send the skb */
557 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
558 skb = NULL;
559 if (ret) {
560 err_str = "Unable to send map info";
561 goto send_mapping_info_exit;
562 }
563 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
564 ret = -ENOMEM;
565 err_str = "Insufficient skbs for map info";
566 goto send_mapping_info_exit;
567 }
568 skb = dev_alloc_skb(NLMSG_GOODSIZE);
569 if (!skb) {
570 ret = -ENOMEM;
571 err_str = "Unable to allocate skb";
572 goto send_mapping_info_exit;
573 }
574 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
575 }
576 }
577 }
578send_mapping_info_unlock:
579 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
580send_mapping_info_exit:
581 if (ret) {
582 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
583 if (skb)
584 dev_kfree_skb(skb);
585 return ret;
586 }
587 send_nlmsg_done(skb, nl_client, iwpm_pid);
588 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
589}
590
591int iwpm_mapinfo_available(void)
592{
593 unsigned long flags;
594 int full_bucket = 0, i = 0;
595
596 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
597 if (iwpm_hash_bucket) {
598 for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) {
599 if (!hlist_empty(&iwpm_hash_bucket[i])) {
600 full_bucket = 1;
601 break;
602 }
603 }
604 }
605 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
606 return full_bucket;
607}
Linux 6.x block layer and io_uring tree(s)