blob: 329fb659fae4c2b89d4c0830466dab297906dc8c [file] [log] [blame]
Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/bearer.c: TIPC bearer code
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 1996-2006, Ericsson AB
Allan Stephens2d627b92011-01-07 13:00:11 -05005 * Copyright (c) 2004-2006, 2010-2011, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "config.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "bearer.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040#include "discover.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041
42#define MAX_ADDR_STR 32
43
Paul Gortmaker358a0d12011-12-29 20:19:42 -050044static struct tipc_media *media_list[MAX_MEDIA];
Allan Stephense3ec9c72010-12-31 18:59:34 +000045static u32 media_count;
Per Lidenb97bf3f2006-01-02 19:04:38 +010046
Allan Stephens2d627b92011-01-07 13:00:11 -050047struct tipc_bearer tipc_bearers[MAX_BEARERS];
Per Lidenb97bf3f2006-01-02 19:04:38 +010048
Allan Stephens3a777ff2011-04-21 13:58:26 -050049static void bearer_disable(struct tipc_bearer *b_ptr);
50
Per Lidenb97bf3f2006-01-02 19:04:38 +010051/**
52 * media_name_valid - validate media name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090053 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010054 * Returns 1 if media name is valid, otherwise 0.
55 */
56
57static int media_name_valid(const char *name)
58{
59 u32 len;
60
61 len = strlen(name);
62 if ((len + 1) > TIPC_MAX_MEDIA_NAME)
63 return 0;
Eric Dumazeta02cec22010-09-22 20:43:57 +000064 return strspn(name, tipc_alphabet) == len;
Per Lidenb97bf3f2006-01-02 19:04:38 +010065}
66
67/**
Allan Stephens5c216e12011-10-18 11:34:29 -040068 * tipc_media_find - locates specified media object by name
Per Lidenb97bf3f2006-01-02 19:04:38 +010069 */
70
Paul Gortmaker358a0d12011-12-29 20:19:42 -050071struct tipc_media *tipc_media_find(const char *name)
Per Lidenb97bf3f2006-01-02 19:04:38 +010072{
Per Lidenb97bf3f2006-01-02 19:04:38 +010073 u32 i;
74
Allan Stephensa31abe82011-10-07 09:25:12 -040075 for (i = 0; i < media_count; i++) {
76 if (!strcmp(media_list[i]->name, name))
77 return media_list[i];
Per Lidenb97bf3f2006-01-02 19:04:38 +010078 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -080079 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010080}
81
82/**
Allan Stephensc79be452011-10-06 16:40:55 -040083 * media_find_id - locates specified media object by type identifier
84 */
85
Paul Gortmaker358a0d12011-12-29 20:19:42 -050086static struct tipc_media *media_find_id(u8 type)
Allan Stephensc79be452011-10-06 16:40:55 -040087{
88 u32 i;
89
90 for (i = 0; i < media_count; i++) {
Allan Stephensa31abe82011-10-07 09:25:12 -040091 if (media_list[i]->type_id == type)
92 return media_list[i];
Allan Stephensc79be452011-10-06 16:40:55 -040093 }
94 return NULL;
95}
96
97/**
Per Lidenb97bf3f2006-01-02 19:04:38 +010098 * tipc_register_media - register a media type
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090099 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100 * Bearers for this media type must be activated separately at a later stage.
101 */
102
Paul Gortmaker358a0d12011-12-29 20:19:42 -0500103int tipc_register_media(struct tipc_media *m_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100104{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100105 int res = -EINVAL;
106
Per Liden4323add2006-01-18 00:38:21 +0100107 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100108
Allan Stephens6c349212011-10-07 09:54:44 -0400109 if (!media_name_valid(m_ptr->name))
Neil Hormand0021b22010-03-03 08:31:23 +0000110 goto exit;
Allan Stephens3d749a62011-10-07 15:19:11 -0400111 if ((m_ptr->bcast_addr.media_id != m_ptr->type_id) ||
112 !m_ptr->bcast_addr.broadcast)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100113 goto exit;
Allan Stephens6c349212011-10-07 09:54:44 -0400114 if (m_ptr->priority > TIPC_MAX_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100115 goto exit;
Allan Stephens706767d2011-10-06 15:28:44 -0400116 if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) ||
Allan Stephens6c349212011-10-07 09:54:44 -0400117 (m_ptr->tolerance > TIPC_MAX_LINK_TOL))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118 goto exit;
Allan Stephens6c349212011-10-07 09:54:44 -0400119 if (media_count >= MAX_MEDIA)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 goto exit;
Allan Stephens5c216e12011-10-18 11:34:29 -0400121 if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id))
Allan Stephensc79be452011-10-06 16:40:55 -0400122 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100123
Allan Stephensa31abe82011-10-07 09:25:12 -0400124 media_list[media_count] = m_ptr;
Allan Stephensc79be452011-10-06 16:40:55 -0400125 media_count++;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100126 res = 0;
127exit:
Per Liden4323add2006-01-18 00:38:21 +0100128 write_unlock_bh(&tipc_net_lock);
Allan Stephens6c349212011-10-07 09:54:44 -0400129 if (res)
130 warn("Media <%s> registration error\n", m_ptr->name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100131 return res;
132}
133
134/**
Per Liden4323add2006-01-18 00:38:21 +0100135 * tipc_media_addr_printf - record media address in print buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100136 */
137
Per Liden4323add2006-01-18 00:38:21 +0100138void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100139{
Allan Stephensc61b6662011-10-07 11:31:49 -0400140 char addr_str[MAX_ADDR_STR];
Paul Gortmaker358a0d12011-12-29 20:19:42 -0500141 struct tipc_media *m_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100142
Allan Stephens3d749a62011-10-07 15:19:11 -0400143 m_ptr = media_find_id(a->media_id);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144
Allan Stephensc61b6662011-10-07 11:31:49 -0400145 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
146 tipc_printf(pb, "%s(%s)", m_ptr->name, addr_str);
147 else {
Allan Stephensc61b6662011-10-07 11:31:49 -0400148 u32 i;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100149
Allan Stephens3d749a62011-10-07 15:19:11 -0400150 tipc_printf(pb, "UNKNOWN(%u)", a->media_id);
151 for (i = 0; i < sizeof(a->value); i++)
152 tipc_printf(pb, "-%02x", a->value[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100153 }
154}
155
156/**
Per Liden4323add2006-01-18 00:38:21 +0100157 * tipc_media_get_names - record names of registered media in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100158 */
159
Per Liden4323add2006-01-18 00:38:21 +0100160struct sk_buff *tipc_media_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100161{
162 struct sk_buff *buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163 int i;
164
Per Liden4323add2006-01-18 00:38:21 +0100165 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100166 if (!buf)
167 return NULL;
168
Per Liden4323add2006-01-18 00:38:21 +0100169 read_lock_bh(&tipc_net_lock);
Allan Stephensa31abe82011-10-07 09:25:12 -0400170 for (i = 0; i < media_count; i++) {
171 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
172 media_list[i]->name,
173 strlen(media_list[i]->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100174 }
Per Liden4323add2006-01-18 00:38:21 +0100175 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100176 return buf;
177}
178
179/**
180 * bearer_name_validate - validate & (optionally) deconstruct bearer name
181 * @name - ptr to bearer name string
182 * @name_parts - ptr to area for bearer name components (or NULL if not needed)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900183 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100184 * Returns 1 if bearer name is valid, otherwise 0.
185 */
186
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900187static int bearer_name_validate(const char *name,
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500188 struct tipc_bearer_names *name_parts)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100189{
190 char name_copy[TIPC_MAX_BEARER_NAME];
191 char *media_name;
192 char *if_name;
193 u32 media_len;
194 u32 if_len;
195
196 /* copy bearer name & ensure length is OK */
197
198 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
199 /* need above in case non-Posix strncpy() doesn't pad with nulls */
200 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
201 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
202 return 0;
203
204 /* ensure all component parts of bearer name are present */
205
206 media_name = name_copy;
Allan Stephens2db99832010-12-31 18:59:33 +0000207 if_name = strchr(media_name, ':');
208 if (if_name == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100209 return 0;
210 *(if_name++) = 0;
211 media_len = if_name - media_name;
212 if_len = strlen(if_name) + 1;
213
214 /* validate component parts of bearer name */
215
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900216 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
217 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
Per Lidenb97bf3f2006-01-02 19:04:38 +0100218 (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
219 (strspn(if_name, tipc_alphabet) != (if_len - 1)))
220 return 0;
221
222 /* return bearer name components, if necessary */
223
224 if (name_parts) {
225 strcpy(name_parts->media_name, media_name);
226 strcpy(name_parts->if_name, if_name);
227 }
228 return 1;
229}
230
231/**
Allan Stephens5c216e12011-10-18 11:34:29 -0400232 * tipc_bearer_find - locates bearer object with matching bearer name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233 */
234
Allan Stephens5c216e12011-10-18 11:34:29 -0400235struct tipc_bearer *tipc_bearer_find(const char *name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100236{
Allan Stephens2d627b92011-01-07 13:00:11 -0500237 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100238 u32 i;
239
Per Liden4323add2006-01-18 00:38:21 +0100240 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Allan Stephens2d627b92011-01-07 13:00:11 -0500241 if (b_ptr->active && (!strcmp(b_ptr->name, name)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100242 return b_ptr;
243 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800244 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100245}
246
247/**
Per Liden4323add2006-01-18 00:38:21 +0100248 * tipc_bearer_find_interface - locates bearer object with matching interface name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249 */
250
Allan Stephens2d627b92011-01-07 13:00:11 -0500251struct tipc_bearer *tipc_bearer_find_interface(const char *if_name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100252{
Allan Stephens2d627b92011-01-07 13:00:11 -0500253 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254 char *b_if_name;
255 u32 i;
256
Per Liden4323add2006-01-18 00:38:21 +0100257 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100258 if (!b_ptr->active)
259 continue;
Allan Stephens2d627b92011-01-07 13:00:11 -0500260 b_if_name = strchr(b_ptr->name, ':') + 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100261 if (!strcmp(b_if_name, if_name))
262 return b_ptr;
263 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800264 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100265}
266
267/**
Per Liden4323add2006-01-18 00:38:21 +0100268 * tipc_bearer_get_names - record names of bearers in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100269 */
270
Per Liden4323add2006-01-18 00:38:21 +0100271struct sk_buff *tipc_bearer_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272{
273 struct sk_buff *buf;
Allan Stephens2d627b92011-01-07 13:00:11 -0500274 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275 int i, j;
276
Per Liden4323add2006-01-18 00:38:21 +0100277 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100278 if (!buf)
279 return NULL;
280
Per Liden4323add2006-01-18 00:38:21 +0100281 read_lock_bh(&tipc_net_lock);
Allan Stephensa31abe82011-10-07 09:25:12 -0400282 for (i = 0; i < media_count; i++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100283 for (j = 0; j < MAX_BEARERS; j++) {
Per Liden4323add2006-01-18 00:38:21 +0100284 b_ptr = &tipc_bearers[j];
Allan Stephensa31abe82011-10-07 09:25:12 -0400285 if (b_ptr->active && (b_ptr->media == media_list[i])) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900286 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
Allan Stephens2d627b92011-01-07 13:00:11 -0500287 b_ptr->name,
288 strlen(b_ptr->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100289 }
290 }
291 }
Per Liden4323add2006-01-18 00:38:21 +0100292 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293 return buf;
294}
295
Allan Stephens2d627b92011-01-07 13:00:11 -0500296void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297{
Per Liden4323add2006-01-18 00:38:21 +0100298 tipc_nmap_add(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100299 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500300 tipc_disc_add_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301}
302
Allan Stephens2d627b92011-01-07 13:00:11 -0500303void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100304{
Per Liden4323add2006-01-18 00:38:21 +0100305 tipc_nmap_remove(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100306 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500307 tipc_disc_remove_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100308}
309
310/*
311 * bearer_push(): Resolve bearer congestion. Force the waiting
312 * links to push out their unsent packets, one packet per link
313 * per iteration, until all packets are gone or congestion reoccurs.
Per Liden4323add2006-01-18 00:38:21 +0100314 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315 * bearer.lock must be taken before calling
316 * Returns binary true(1) ore false(0)
317 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500318static int bearer_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100319{
Allan Stephens0e35fd52008-07-14 22:44:01 -0700320 u32 res = 0;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500321 struct tipc_link *ln, *tln;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100322
Allan Stephens2d627b92011-01-07 13:00:11 -0500323 if (b_ptr->blocked)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100324 return 0;
325
326 while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
327 list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100328 res = tipc_link_push_packet(ln);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100329 if (res == PUSH_FAILED)
330 break;
331 if (res == PUSH_FINISHED)
332 list_move_tail(&ln->link_list, &b_ptr->links);
333 }
334 }
335 return list_empty(&b_ptr->cong_links);
336}
337
Allan Stephens2d627b92011-01-07 13:00:11 -0500338void tipc_bearer_lock_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100339{
Allan Stephens2d627b92011-01-07 13:00:11 -0500340 spin_lock_bh(&b_ptr->lock);
Allan Stephens23f0ff92011-04-07 11:25:26 -0400341 bearer_push(b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500342 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100343}
344
345
346/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900347 * Interrupt enabling new requests after bearer congestion or blocking:
348 * See bearer_send().
Per Lidenb97bf3f2006-01-02 19:04:38 +0100349 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500350void tipc_continue(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100351{
Allan Stephens2d627b92011-01-07 13:00:11 -0500352 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100353 if (!list_empty(&b_ptr->cong_links))
Per Liden4323add2006-01-18 00:38:21 +0100354 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500355 b_ptr->blocked = 0;
356 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100357}
358
359/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900360 * Schedule link for sending of messages after the bearer
361 * has been deblocked by 'continue()'. This method is called
362 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100363 * the bearer is congested. 'tipc_net_lock' is in read_lock here
Per Lidenb97bf3f2006-01-02 19:04:38 +0100364 * bearer.lock is busy
365 */
366
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500367static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr,
368 struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369{
370 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
371}
372
373/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900374 * Schedule link for sending of messages after the bearer
375 * has been deblocked by 'continue()'. This method is called
376 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100377 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100378 * bearer.lock is free
379 */
380
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500381void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382{
Allan Stephens2d627b92011-01-07 13:00:11 -0500383 spin_lock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100384 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500385 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100386}
387
388
389/*
Per Liden4323add2006-01-18 00:38:21 +0100390 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100391 * and if there is, try to resolve it before returning.
Per Liden4323add2006-01-18 00:38:21 +0100392 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100393 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500394int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr,
395 struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100396{
397 int res = 1;
398
399 if (list_empty(&b_ptr->cong_links))
400 return 1;
Allan Stephens2d627b92011-01-07 13:00:11 -0500401 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100402 if (!bearer_push(b_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100403 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100404 res = 0;
405 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500406 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100407 return res;
408}
409
Allan Stephensb274f4a2010-05-11 14:30:16 +0000410/**
411 * tipc_bearer_congested - determines if bearer is currently congested
412 */
413
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500414int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
Allan Stephensb274f4a2010-05-11 14:30:16 +0000415{
Allan Stephens2d627b92011-01-07 13:00:11 -0500416 if (unlikely(b_ptr->blocked))
Allan Stephensb274f4a2010-05-11 14:30:16 +0000417 return 1;
418 if (likely(list_empty(&b_ptr->cong_links)))
419 return 0;
420 return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
421}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100422
423/**
424 * tipc_enable_bearer - enable bearer with the given name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900425 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100426
Allan Stephens50d3e632011-02-28 14:56:15 -0500427int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100428{
Allan Stephens2d627b92011-01-07 13:00:11 -0500429 struct tipc_bearer *b_ptr;
Paul Gortmaker358a0d12011-12-29 20:19:42 -0500430 struct tipc_media *m_ptr;
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500431 struct tipc_bearer_names b_names;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100432 char addr_string[16];
433 u32 bearer_id;
434 u32 with_this_prio;
435 u32 i;
436 int res = -EINVAL;
437
Allan Stephensa10bd922006-06-25 23:52:17 -0700438 if (tipc_mode != TIPC_NET_MODE) {
439 warn("Bearer <%s> rejected, not supported in standalone mode\n",
440 name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100441 return -ENOPROTOOPT;
Allan Stephensa10bd922006-06-25 23:52:17 -0700442 }
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500443 if (!bearer_name_validate(name, &b_names)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700444 warn("Bearer <%s> rejected, illegal name\n", name);
Per Liden16cb4b32006-01-13 22:22:22 +0100445 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700446 }
Allan Stephens66e019a2011-04-20 16:24:07 -0500447 if (tipc_addr_domain_valid(disc_domain) &&
448 (disc_domain != tipc_own_addr)) {
449 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
450 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
451 res = 0; /* accept any node in own cluster */
452 } else if (in_own_cluster(disc_domain))
453 res = 0; /* accept specified node in own cluster */
454 }
455 if (res) {
Allan Stephens50d3e632011-02-28 14:56:15 -0500456 warn("Bearer <%s> rejected, illegal discovery domain\n", name);
Allan Stephensa10bd922006-06-25 23:52:17 -0700457 return -EINVAL;
458 }
Per Liden16cb4b32006-01-13 22:22:22 +0100459 if ((priority < TIPC_MIN_LINK_PRI ||
460 priority > TIPC_MAX_LINK_PRI) &&
Allan Stephensa10bd922006-06-25 23:52:17 -0700461 (priority != TIPC_MEDIA_LINK_PRI)) {
462 warn("Bearer <%s> rejected, illegal priority\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100463 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700464 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100465
Per Liden4323add2006-01-18 00:38:21 +0100466 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100467
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500468 m_ptr = tipc_media_find(b_names.media_name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100469 if (!m_ptr) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700470 warn("Bearer <%s> rejected, media <%s> not registered\n", name,
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500471 b_names.media_name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500472 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100473 }
Per Liden16cb4b32006-01-13 22:22:22 +0100474
475 if (priority == TIPC_MEDIA_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100476 priority = m_ptr->priority;
477
478restart:
479 bearer_id = MAX_BEARERS;
480 with_this_prio = 1;
481 for (i = MAX_BEARERS; i-- != 0; ) {
Per Liden4323add2006-01-18 00:38:21 +0100482 if (!tipc_bearers[i].active) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483 bearer_id = i;
484 continue;
485 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500486 if (!strcmp(name, tipc_bearers[i].name)) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700487 warn("Bearer <%s> rejected, already enabled\n", name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500488 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100489 }
Per Liden4323add2006-01-18 00:38:21 +0100490 if ((tipc_bearers[i].priority == priority) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100491 (++with_this_prio > 2)) {
492 if (priority-- == 0) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700493 warn("Bearer <%s> rejected, duplicate priority\n",
494 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500495 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100496 }
Allan Stephensa10bd922006-06-25 23:52:17 -0700497 warn("Bearer <%s> priority adjustment required %u->%u\n",
Per Lidenb97bf3f2006-01-02 19:04:38 +0100498 name, priority + 1, priority);
499 goto restart;
500 }
501 }
502 if (bearer_id >= MAX_BEARERS) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900503 warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
Allan Stephensa10bd922006-06-25 23:52:17 -0700504 name, MAX_BEARERS);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500505 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100506 }
507
Per Liden4323add2006-01-18 00:38:21 +0100508 b_ptr = &tipc_bearers[bearer_id];
Allan Stephens2d627b92011-01-07 13:00:11 -0500509 strcpy(b_ptr->name, name);
510 res = m_ptr->enable_bearer(b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100511 if (res) {
Allan Stephensa10bd922006-06-25 23:52:17 -0700512 warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500513 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100514 }
515
516 b_ptr->identity = bearer_id;
517 b_ptr->media = m_ptr;
Allan Stephens5c216e12011-10-18 11:34:29 -0400518 b_ptr->tolerance = m_ptr->tolerance;
519 b_ptr->window = m_ptr->window;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100520 b_ptr->net_plane = bearer_id + 'A';
521 b_ptr->active = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100522 b_ptr->priority = priority;
523 INIT_LIST_HEAD(&b_ptr->cong_links);
524 INIT_LIST_HEAD(&b_ptr->links);
Allan Stephens2d627b92011-01-07 13:00:11 -0500525 spin_lock_init(&b_ptr->lock);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500526
527 res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
528 if (res) {
529 bearer_disable(b_ptr);
530 warn("Bearer <%s> rejected, discovery object creation failed\n",
531 name);
532 goto exit;
533 }
Per Liden16cb4b32006-01-13 22:22:22 +0100534 info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
Allan Stephens50d3e632011-02-28 14:56:15 -0500535 name, tipc_addr_string_fill(addr_string, disc_domain), priority);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500536exit:
Per Liden4323add2006-01-18 00:38:21 +0100537 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100538 return res;
539}
540
541/**
542 * tipc_block_bearer(): Block the bearer with the given name,
543 * and reset all its links
544 */
545
546int tipc_block_bearer(const char *name)
547{
Allan Stephens2d627b92011-01-07 13:00:11 -0500548 struct tipc_bearer *b_ptr = NULL;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500549 struct tipc_link *l_ptr;
550 struct tipc_link *temp_l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100551
Per Liden4323add2006-01-18 00:38:21 +0100552 read_lock_bh(&tipc_net_lock);
Allan Stephens5c216e12011-10-18 11:34:29 -0400553 b_ptr = tipc_bearer_find(name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100554 if (!b_ptr) {
555 warn("Attempt to block unknown bearer <%s>\n", name);
Per Liden4323add2006-01-18 00:38:21 +0100556 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100557 return -EINVAL;
558 }
559
Allan Stephensa10bd922006-06-25 23:52:17 -0700560 info("Blocking bearer <%s>\n", name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500561 spin_lock_bh(&b_ptr->lock);
562 b_ptr->blocked = 1;
Allan Stephens4b3743e2011-05-26 13:59:17 -0400563 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100564 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
David S. Miller6c000552008-09-02 23:38:32 -0700565 struct tipc_node *n_ptr = l_ptr->owner;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100566
567 spin_lock_bh(&n_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100568 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100569 spin_unlock_bh(&n_ptr->lock);
570 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500571 spin_unlock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100572 read_unlock_bh(&tipc_net_lock);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700573 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100574}
575
576/**
577 * bearer_disable -
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900578 *
Per Liden4323add2006-01-18 00:38:21 +0100579 * Note: This routine assumes caller holds tipc_net_lock.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100580 */
581
Allan Stephens2d627b92011-01-07 13:00:11 -0500582static void bearer_disable(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100583{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500584 struct tipc_link *l_ptr;
585 struct tipc_link *temp_l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100586
Allan Stephens2d627b92011-01-07 13:00:11 -0500587 info("Disabling bearer <%s>\n", b_ptr->name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500588 spin_lock_bh(&b_ptr->lock);
Allan Stephens2d627b92011-01-07 13:00:11 -0500589 b_ptr->blocked = 1;
590 b_ptr->media->disable_bearer(b_ptr);
Allan Stephens4b3743e2011-05-26 13:59:17 -0400591 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100592 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100593 tipc_link_delete(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594 }
Allan Stephens3a777ff2011-04-21 13:58:26 -0500595 if (b_ptr->link_req)
596 tipc_disc_delete(b_ptr->link_req);
Allan Stephens2d627b92011-01-07 13:00:11 -0500597 spin_unlock_bh(&b_ptr->lock);
598 memset(b_ptr, 0, sizeof(struct tipc_bearer));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100599}
600
601int tipc_disable_bearer(const char *name)
602{
Allan Stephens2d627b92011-01-07 13:00:11 -0500603 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100604 int res;
605
Per Liden4323add2006-01-18 00:38:21 +0100606 write_lock_bh(&tipc_net_lock);
Allan Stephens5c216e12011-10-18 11:34:29 -0400607 b_ptr = tipc_bearer_find(name);
Allan Stephensccc901e2010-10-14 13:58:26 +0000608 if (b_ptr == NULL) {
609 warn("Attempt to disable unknown bearer <%s>\n", name);
610 res = -EINVAL;
Allan Stephens28cc9372010-11-30 12:00:56 +0000611 } else {
612 bearer_disable(b_ptr);
613 res = 0;
614 }
Per Liden4323add2006-01-18 00:38:21 +0100615 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100616 return res;
617}
618
619
620
Per Liden4323add2006-01-18 00:38:21 +0100621void tipc_bearer_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100622{
623 u32 i;
624
Per Lidenb97bf3f2006-01-02 19:04:38 +0100625 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100626 if (tipc_bearers[i].active)
Allan Stephensccc901e2010-10-14 13:58:26 +0000627 bearer_disable(&tipc_bearers[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100628 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100629 media_count = 0;
630}