diff options
Diffstat (limited to 'drivers/infiniband/core/iwpm_util.c')
-rw-r--r-- | drivers/infiniband/core/iwpm_util.c | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/drivers/infiniband/core/iwpm_util.c b/drivers/infiniband/core/iwpm_util.c new file mode 100644 index 000000000000..69e9f84c1605 --- /dev/null +++ b/drivers/infiniband/core/iwpm_util.c | |||
@@ -0,0 +1,607 @@ | |||
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 | |||
39 | static LIST_HEAD(iwpm_nlmsg_req_list); | ||
40 | static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock); | ||
41 | |||
42 | static struct hlist_head *iwpm_hash_bucket; | ||
43 | static DEFINE_SPINLOCK(iwpm_mapinfo_lock); | ||
44 | |||
45 | static DEFINE_MUTEX(iwpm_admin_lock); | ||
46 | static struct iwpm_admin_data iwpm_admin; | ||
47 | |||
48 | int 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 | } | ||
67 | EXPORT_SYMBOL(iwpm_init); | ||
68 | |||
69 | static void free_hash_bucket(void); | ||
70 | |||
71 | int 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 | } | ||
90 | EXPORT_SYMBOL(iwpm_exit); | ||
91 | |||
92 | static struct hlist_head *get_hash_bucket_head(struct sockaddr_storage *, | ||
93 | struct sockaddr_storage *); | ||
94 | |||
95 | int 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 | } | ||
126 | EXPORT_SYMBOL(iwpm_create_mapinfo); | ||
127 | |||
128 | int 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 | } | ||
158 | EXPORT_SYMBOL(iwpm_remove_mapinfo); | ||
159 | |||
160 | static 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 | |||
183 | struct 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 | |||
207 | void 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 | |||
224 | struct 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 | |||
243 | int 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 | |||
261 | int iwpm_get_nlmsg_seq(void) | ||
262 | { | ||
263 | return atomic_inc_return(&iwpm_admin.nlmsg_seq); | ||
264 | } | ||
265 | |||
266 | int 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 | |||
273 | void 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 */ | ||
281 | int iwpm_registered_client(u8 nl_client) | ||
282 | { | ||
283 | return iwpm_admin.reg_list[nl_client]; | ||
284 | } | ||
285 | |||
286 | /* valid client */ | ||
287 | void iwpm_set_registered(u8 nl_client, int reg) | ||
288 | { | ||
289 | iwpm_admin.reg_list[nl_client] = reg; | ||
290 | } | ||
291 | |||
292 | int 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 | |||
323 | struct 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 | } | ||
339 | create_nlmsg_exit: | ||
340 | return skb; | ||
341 | } | ||
342 | |||
343 | int 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; | ||
367 | parse_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 | |||
373 | void 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 | |||
398 | static 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 | |||
405 | static 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 | |||
412 | static 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 | |||
439 | static 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; | ||
470 | mapinfo_num_error: | ||
471 | pr_info("%s: %s\n", __func__, err_str); | ||
472 | if (skb) | ||
473 | dev_kfree_skb(skb); | ||
474 | return ret; | ||
475 | } | ||
476 | |||
477 | static 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 | |||
496 | int 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 | } | ||
578 | send_mapping_info_unlock: | ||
579 | spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); | ||
580 | send_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 | |||
591 | int 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 | } | ||