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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/**
Allan Stephens5c216e12011-10-18 11:34:29 -040052 * tipc_media_find - locates specified media object by name
Per Lidenb97bf3f2006-01-02 19:04:38 +010053 */
Paul Gortmaker358a0d12011-12-29 20:19:42 -050054struct tipc_media *tipc_media_find(const char *name)
Per Lidenb97bf3f2006-01-02 19:04:38 +010055{
Per Lidenb97bf3f2006-01-02 19:04:38 +010056 u32 i;
57
Allan Stephensa31abe82011-10-07 09:25:12 -040058 for (i = 0; i < media_count; i++) {
59 if (!strcmp(media_list[i]->name, name))
60 return media_list[i];
Per Lidenb97bf3f2006-01-02 19:04:38 +010061 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -080062 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010063}
64
65/**
Allan Stephensc79be452011-10-06 16:40:55 -040066 * media_find_id - locates specified media object by type identifier
67 */
Paul Gortmaker358a0d12011-12-29 20:19:42 -050068static struct tipc_media *media_find_id(u8 type)
Allan Stephensc79be452011-10-06 16:40:55 -040069{
70 u32 i;
71
72 for (i = 0; i < media_count; i++) {
Allan Stephensa31abe82011-10-07 09:25:12 -040073 if (media_list[i]->type_id == type)
74 return media_list[i];
Allan Stephensc79be452011-10-06 16:40:55 -040075 }
76 return NULL;
77}
78
79/**
Per Lidenb97bf3f2006-01-02 19:04:38 +010080 * tipc_register_media - register a media type
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090081 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010082 * Bearers for this media type must be activated separately at a later stage.
83 */
Paul Gortmaker358a0d12011-12-29 20:19:42 -050084int tipc_register_media(struct tipc_media *m_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +010085{
Per Lidenb97bf3f2006-01-02 19:04:38 +010086 int res = -EINVAL;
87
Per Liden4323add2006-01-18 00:38:21 +010088 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +010089
Ying Xue38129432012-08-16 12:09:09 +000090 if ((strlen(m_ptr->name) + 1) > TIPC_MAX_MEDIA_NAME)
Neil Hormand0021b22010-03-03 08:31:23 +000091 goto exit;
Allan Stephens3d749a62011-10-07 15:19:11 -040092 if ((m_ptr->bcast_addr.media_id != m_ptr->type_id) ||
93 !m_ptr->bcast_addr.broadcast)
Per Lidenb97bf3f2006-01-02 19:04:38 +010094 goto exit;
Allan Stephens6c349212011-10-07 09:54:44 -040095 if (m_ptr->priority > TIPC_MAX_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +010096 goto exit;
Allan Stephens706767d2011-10-06 15:28:44 -040097 if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) ||
Allan Stephens6c349212011-10-07 09:54:44 -040098 (m_ptr->tolerance > TIPC_MAX_LINK_TOL))
Per Lidenb97bf3f2006-01-02 19:04:38 +010099 goto exit;
Allan Stephens6c349212011-10-07 09:54:44 -0400100 if (media_count >= MAX_MEDIA)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100101 goto exit;
Allan Stephens5c216e12011-10-18 11:34:29 -0400102 if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id))
Allan Stephensc79be452011-10-06 16:40:55 -0400103 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100104
Allan Stephensa31abe82011-10-07 09:25:12 -0400105 media_list[media_count] = m_ptr;
Allan Stephensc79be452011-10-06 16:40:55 -0400106 media_count++;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100107 res = 0;
108exit:
Per Liden4323add2006-01-18 00:38:21 +0100109 write_unlock_bh(&tipc_net_lock);
Allan Stephens6c349212011-10-07 09:54:44 -0400110 if (res)
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400111 pr_warn("Media <%s> registration error\n", m_ptr->name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100112 return res;
113}
114
115/**
Per Liden4323add2006-01-18 00:38:21 +0100116 * tipc_media_addr_printf - record media address in print buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117 */
Erik Hugnedc1aed32012-06-29 00:50:23 -0400118void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100119{
Allan Stephensc61b6662011-10-07 11:31:49 -0400120 char addr_str[MAX_ADDR_STR];
Paul Gortmaker358a0d12011-12-29 20:19:42 -0500121 struct tipc_media *m_ptr;
Erik Hugnedc1aed32012-06-29 00:50:23 -0400122 int ret;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100123
Allan Stephens3d749a62011-10-07 15:19:11 -0400124 m_ptr = media_find_id(a->media_id);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100125
Allan Stephensc61b6662011-10-07 11:31:49 -0400126 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
Erik Hugnedc1aed32012-06-29 00:50:23 -0400127 ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
Allan Stephensc61b6662011-10-07 11:31:49 -0400128 else {
Allan Stephensc61b6662011-10-07 11:31:49 -0400129 u32 i;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100130
Erik Hugnedc1aed32012-06-29 00:50:23 -0400131 ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
Allan Stephens3d749a62011-10-07 15:19:11 -0400132 for (i = 0; i < sizeof(a->value); i++)
Erik Hugnedc1aed32012-06-29 00:50:23 -0400133 ret += tipc_snprintf(buf - ret, len + ret,
134 "-%02x", a->value[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100135 }
136}
137
138/**
Per Liden4323add2006-01-18 00:38:21 +0100139 * tipc_media_get_names - record names of registered media in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100140 */
Per Liden4323add2006-01-18 00:38:21 +0100141struct sk_buff *tipc_media_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100142{
143 struct sk_buff *buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144 int i;
145
Per Liden4323add2006-01-18 00:38:21 +0100146 buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100147 if (!buf)
148 return NULL;
149
Per Liden4323add2006-01-18 00:38:21 +0100150 read_lock_bh(&tipc_net_lock);
Allan Stephensa31abe82011-10-07 09:25:12 -0400151 for (i = 0; i < media_count; i++) {
152 tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
153 media_list[i]->name,
154 strlen(media_list[i]->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155 }
Per Liden4323add2006-01-18 00:38:21 +0100156 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157 return buf;
158}
159
160/**
161 * bearer_name_validate - validate & (optionally) deconstruct bearer name
Ben Hutchings2c530402012-07-10 10:55:09 +0000162 * @name: ptr to bearer name string
163 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900164 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100165 * Returns 1 if bearer name is valid, otherwise 0.
166 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900167static int bearer_name_validate(const char *name,
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500168 struct tipc_bearer_names *name_parts)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100169{
170 char name_copy[TIPC_MAX_BEARER_NAME];
171 char *media_name;
172 char *if_name;
173 u32 media_len;
174 u32 if_len;
175
176 /* copy bearer name & ensure length is OK */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100177 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
178 /* need above in case non-Posix strncpy() doesn't pad with nulls */
179 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
180 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
181 return 0;
182
183 /* ensure all component parts of bearer name are present */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100184 media_name = name_copy;
Allan Stephens2db99832010-12-31 18:59:33 +0000185 if_name = strchr(media_name, ':');
186 if (if_name == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100187 return 0;
188 *(if_name++) = 0;
189 media_len = if_name - media_name;
190 if_len = strlen(if_name) + 1;
191
192 /* validate component parts of bearer name */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900193 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
Ying Xuefc073932012-08-16 12:09:08 +0000194 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100195 return 0;
196
197 /* return bearer name components, if necessary */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100198 if (name_parts) {
199 strcpy(name_parts->media_name, media_name);
200 strcpy(name_parts->if_name, if_name);
201 }
202 return 1;
203}
204
205/**
Allan Stephens5c216e12011-10-18 11:34:29 -0400206 * tipc_bearer_find - locates bearer object with matching bearer name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100207 */
Allan Stephens5c216e12011-10-18 11:34:29 -0400208struct tipc_bearer *tipc_bearer_find(const char *name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100209{
Allan Stephens2d627b92011-01-07 13:00:11 -0500210 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100211 u32 i;
212
Per Liden4323add2006-01-18 00:38:21 +0100213 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Allan Stephens2d627b92011-01-07 13:00:11 -0500214 if (b_ptr->active && (!strcmp(b_ptr->name, name)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100215 return b_ptr;
216 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800217 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100218}
219
220/**
Per Liden4323add2006-01-18 00:38:21 +0100221 * tipc_bearer_find_interface - locates bearer object with matching interface name
Per Lidenb97bf3f2006-01-02 19:04:38 +0100222 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500223struct tipc_bearer *tipc_bearer_find_interface(const char *if_name)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100224{
Allan Stephens2d627b92011-01-07 13:00:11 -0500225 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100226 char *b_if_name;
227 u32 i;
228
Per Liden4323add2006-01-18 00:38:21 +0100229 for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100230 if (!b_ptr->active)
231 continue;
Allan Stephens2d627b92011-01-07 13:00:11 -0500232 b_if_name = strchr(b_ptr->name, ':') + 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100233 if (!strcmp(b_if_name, if_name))
234 return b_ptr;
235 }
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800236 return NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100237}
238
239/**
Per Liden4323add2006-01-18 00:38:21 +0100240 * tipc_bearer_get_names - record names of bearers in buffer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100241 */
Per Liden4323add2006-01-18 00:38:21 +0100242struct sk_buff *tipc_bearer_get_names(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100243{
244 struct sk_buff *buf;
Allan Stephens2d627b92011-01-07 13:00:11 -0500245 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100246 int i, j;
247
Per Liden4323add2006-01-18 00:38:21 +0100248 buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100249 if (!buf)
250 return NULL;
251
Per Liden4323add2006-01-18 00:38:21 +0100252 read_lock_bh(&tipc_net_lock);
Allan Stephensa31abe82011-10-07 09:25:12 -0400253 for (i = 0; i < media_count; i++) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254 for (j = 0; j < MAX_BEARERS; j++) {
Per Liden4323add2006-01-18 00:38:21 +0100255 b_ptr = &tipc_bearers[j];
Allan Stephensa31abe82011-10-07 09:25:12 -0400256 if (b_ptr->active && (b_ptr->media == media_list[i])) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900257 tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
Allan Stephens2d627b92011-01-07 13:00:11 -0500258 b_ptr->name,
259 strlen(b_ptr->name) + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100260 }
261 }
262 }
Per Liden4323add2006-01-18 00:38:21 +0100263 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100264 return buf;
265}
266
Allan Stephens2d627b92011-01-07 13:00:11 -0500267void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100268{
Per Liden4323add2006-01-18 00:38:21 +0100269 tipc_nmap_add(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100270 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500271 tipc_disc_add_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272}
273
Allan Stephens2d627b92011-01-07 13:00:11 -0500274void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275{
Per Liden4323add2006-01-18 00:38:21 +0100276 tipc_nmap_remove(&b_ptr->nodes, dest);
Per Liden4323add2006-01-18 00:38:21 +0100277 tipc_bcbearer_sort();
Allan Stephens12099662011-04-21 19:05:25 -0500278 tipc_disc_remove_dest(b_ptr->link_req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100279}
280
281/*
282 * bearer_push(): Resolve bearer congestion. Force the waiting
283 * links to push out their unsent packets, one packet per link
284 * per iteration, until all packets are gone or congestion reoccurs.
Per Liden4323add2006-01-18 00:38:21 +0100285 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100286 * bearer.lock must be taken before calling
287 * Returns binary true(1) ore false(0)
288 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500289static int bearer_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100290{
Allan Stephens0e35fd52008-07-14 22:44:01 -0700291 u32 res = 0;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500292 struct tipc_link *ln, *tln;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293
Allan Stephens2d627b92011-01-07 13:00:11 -0500294 if (b_ptr->blocked)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100295 return 0;
296
297 while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
298 list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100299 res = tipc_link_push_packet(ln);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100300 if (res == PUSH_FAILED)
301 break;
302 if (res == PUSH_FINISHED)
303 list_move_tail(&ln->link_list, &b_ptr->links);
304 }
305 }
306 return list_empty(&b_ptr->cong_links);
307}
308
Allan Stephens2d627b92011-01-07 13:00:11 -0500309void tipc_bearer_lock_push(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100310{
Allan Stephens2d627b92011-01-07 13:00:11 -0500311 spin_lock_bh(&b_ptr->lock);
Allan Stephens23f0ff92011-04-07 11:25:26 -0400312 bearer_push(b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500313 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100314}
315
316
317/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900318 * Interrupt enabling new requests after bearer congestion or blocking:
319 * See bearer_send().
Per Lidenb97bf3f2006-01-02 19:04:38 +0100320 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500321void tipc_continue(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100322{
Allan Stephens2d627b92011-01-07 13:00:11 -0500323 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100324 if (!list_empty(&b_ptr->cong_links))
Per Liden4323add2006-01-18 00:38:21 +0100325 tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500326 b_ptr->blocked = 0;
327 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100328}
329
330/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900331 * Schedule link for sending of messages after the bearer
332 * has been deblocked by 'continue()'. This method is called
333 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100334 * the bearer is congested. 'tipc_net_lock' is in read_lock here
Per Lidenb97bf3f2006-01-02 19:04:38 +0100335 * bearer.lock is busy
336 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500337static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr,
338 struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100339{
340 list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
341}
342
343/*
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900344 * Schedule link for sending of messages after the bearer
345 * has been deblocked by 'continue()'. This method is called
346 * when somebody tries to send a message via this link while
Per Liden4323add2006-01-18 00:38:21 +0100347 * the bearer is congested. 'tipc_net_lock' is in read_lock here,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100348 * bearer.lock is free
349 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500350void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100351{
Allan Stephens2d627b92011-01-07 13:00:11 -0500352 spin_lock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100353 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Allan Stephens2d627b92011-01-07 13:00:11 -0500354 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100355}
356
357
358/*
Per Liden4323add2006-01-18 00:38:21 +0100359 * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100360 * and if there is, try to resolve it before returning.
Per Liden4323add2006-01-18 00:38:21 +0100361 * 'tipc_net_lock' is read_locked when this function is called
Per Lidenb97bf3f2006-01-02 19:04:38 +0100362 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500363int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr,
364 struct tipc_link *l_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100365{
366 int res = 1;
367
368 if (list_empty(&b_ptr->cong_links))
369 return 1;
Allan Stephens2d627b92011-01-07 13:00:11 -0500370 spin_lock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100371 if (!bearer_push(b_ptr)) {
Per Liden4323add2006-01-18 00:38:21 +0100372 tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100373 res = 0;
374 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500375 spin_unlock_bh(&b_ptr->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100376 return res;
377}
378
Allan Stephensb274f4a2010-05-11 14:30:16 +0000379/**
380 * tipc_bearer_congested - determines if bearer is currently congested
381 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500382int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
Allan Stephensb274f4a2010-05-11 14:30:16 +0000383{
Allan Stephens2d627b92011-01-07 13:00:11 -0500384 if (unlikely(b_ptr->blocked))
Allan Stephensb274f4a2010-05-11 14:30:16 +0000385 return 1;
386 if (likely(list_empty(&b_ptr->cong_links)))
387 return 0;
388 return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
389}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100390
391/**
392 * tipc_enable_bearer - enable bearer with the given name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900393 */
Allan Stephens50d3e632011-02-28 14:56:15 -0500394int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100395{
Allan Stephens2d627b92011-01-07 13:00:11 -0500396 struct tipc_bearer *b_ptr;
Paul Gortmaker358a0d12011-12-29 20:19:42 -0500397 struct tipc_media *m_ptr;
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500398 struct tipc_bearer_names b_names;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100399 char addr_string[16];
400 u32 bearer_id;
401 u32 with_this_prio;
402 u32 i;
403 int res = -EINVAL;
404
Allan Stephensb58343f2011-11-08 13:48:28 -0500405 if (!tipc_own_addr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400406 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
407 name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100408 return -ENOPROTOOPT;
Allan Stephensa10bd922006-06-25 23:52:17 -0700409 }
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500410 if (!bearer_name_validate(name, &b_names)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400411 pr_warn("Bearer <%s> rejected, illegal name\n", name);
Per Liden16cb4b32006-01-13 22:22:22 +0100412 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700413 }
Allan Stephens66e019a2011-04-20 16:24:07 -0500414 if (tipc_addr_domain_valid(disc_domain) &&
415 (disc_domain != tipc_own_addr)) {
416 if (tipc_in_scope(disc_domain, tipc_own_addr)) {
417 disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
418 res = 0; /* accept any node in own cluster */
Allan Stephens336ebf52012-04-17 18:02:01 -0400419 } else if (in_own_cluster_exact(disc_domain))
Allan Stephens66e019a2011-04-20 16:24:07 -0500420 res = 0; /* accept specified node in own cluster */
421 }
422 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400423 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
424 name);
Allan Stephensa10bd922006-06-25 23:52:17 -0700425 return -EINVAL;
426 }
Allan Stephens9efde4a2011-11-03 13:15:10 -0400427 if ((priority > TIPC_MAX_LINK_PRI) &&
Allan Stephensa10bd922006-06-25 23:52:17 -0700428 (priority != TIPC_MEDIA_LINK_PRI)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400429 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100430 return -EINVAL;
Allan Stephensa10bd922006-06-25 23:52:17 -0700431 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100432
Per Liden4323add2006-01-18 00:38:21 +0100433 write_lock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100434
Paul Gortmakerf19765f2011-12-29 21:39:49 -0500435 m_ptr = tipc_media_find(b_names.media_name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100436 if (!m_ptr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400437 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
438 name, b_names.media_name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500439 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100440 }
Per Liden16cb4b32006-01-13 22:22:22 +0100441
442 if (priority == TIPC_MEDIA_LINK_PRI)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100443 priority = m_ptr->priority;
444
445restart:
446 bearer_id = MAX_BEARERS;
447 with_this_prio = 1;
448 for (i = MAX_BEARERS; i-- != 0; ) {
Per Liden4323add2006-01-18 00:38:21 +0100449 if (!tipc_bearers[i].active) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100450 bearer_id = i;
451 continue;
452 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500453 if (!strcmp(name, tipc_bearers[i].name)) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400454 pr_warn("Bearer <%s> rejected, already enabled\n",
455 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500456 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100457 }
Per Liden4323add2006-01-18 00:38:21 +0100458 if ((tipc_bearers[i].priority == priority) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100459 (++with_this_prio > 2)) {
460 if (priority-- == 0) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400461 pr_warn("Bearer <%s> rejected, duplicate priority\n",
462 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500463 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100464 }
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400465 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
466 name, priority + 1, priority);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100467 goto restart;
468 }
469 }
470 if (bearer_id >= MAX_BEARERS) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400471 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
472 name, MAX_BEARERS);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500473 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100474 }
475
Per Liden4323add2006-01-18 00:38:21 +0100476 b_ptr = &tipc_bearers[bearer_id];
Allan Stephens2d627b92011-01-07 13:00:11 -0500477 strcpy(b_ptr->name, name);
478 res = m_ptr->enable_bearer(b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100479 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400480 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
481 name, -res);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500482 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483 }
484
485 b_ptr->identity = bearer_id;
486 b_ptr->media = m_ptr;
Allan Stephens5c216e12011-10-18 11:34:29 -0400487 b_ptr->tolerance = m_ptr->tolerance;
488 b_ptr->window = m_ptr->window;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100489 b_ptr->net_plane = bearer_id + 'A';
490 b_ptr->active = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100491 b_ptr->priority = priority;
492 INIT_LIST_HEAD(&b_ptr->cong_links);
493 INIT_LIST_HEAD(&b_ptr->links);
Allan Stephens2d627b92011-01-07 13:00:11 -0500494 spin_lock_init(&b_ptr->lock);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500495
496 res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
497 if (res) {
498 bearer_disable(b_ptr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400499 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
500 name);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500501 goto exit;
502 }
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400503 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
504 name,
505 tipc_addr_string_fill(addr_string, disc_domain), priority);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500506exit:
Per Liden4323add2006-01-18 00:38:21 +0100507 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100508 return res;
509}
510
511/**
Ben Hutchings2c530402012-07-10 10:55:09 +0000512 * tipc_block_bearer - Block the bearer with the given name, and reset all its links
Per Lidenb97bf3f2006-01-02 19:04:38 +0100513 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100514int tipc_block_bearer(const char *name)
515{
Allan Stephens2d627b92011-01-07 13:00:11 -0500516 struct tipc_bearer *b_ptr = NULL;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500517 struct tipc_link *l_ptr;
518 struct tipc_link *temp_l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100519
Per Liden4323add2006-01-18 00:38:21 +0100520 read_lock_bh(&tipc_net_lock);
Allan Stephens5c216e12011-10-18 11:34:29 -0400521 b_ptr = tipc_bearer_find(name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100522 if (!b_ptr) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400523 pr_warn("Attempt to block unknown bearer <%s>\n", name);
Per Liden4323add2006-01-18 00:38:21 +0100524 read_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100525 return -EINVAL;
526 }
527
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400528 pr_info("Blocking bearer <%s>\n", name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500529 spin_lock_bh(&b_ptr->lock);
530 b_ptr->blocked = 1;
Allan Stephens4b3743e2011-05-26 13:59:17 -0400531 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100532 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
David S. Miller6c000552008-09-02 23:38:32 -0700533 struct tipc_node *n_ptr = l_ptr->owner;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100534
535 spin_lock_bh(&n_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100536 tipc_link_reset(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100537 spin_unlock_bh(&n_ptr->lock);
538 }
Allan Stephens2d627b92011-01-07 13:00:11 -0500539 spin_unlock_bh(&b_ptr->lock);
Per Liden4323add2006-01-18 00:38:21 +0100540 read_unlock_bh(&tipc_net_lock);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700541 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100542}
543
544/**
Paul Gortmaker617d3c72012-04-30 15:29:02 -0400545 * bearer_disable
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900546 *
Per Liden4323add2006-01-18 00:38:21 +0100547 * Note: This routine assumes caller holds tipc_net_lock.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100548 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500549static void bearer_disable(struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100550{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500551 struct tipc_link *l_ptr;
552 struct tipc_link *temp_l_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100553
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400554 pr_info("Disabling bearer <%s>\n", b_ptr->name);
Allan Stephens2d627b92011-01-07 13:00:11 -0500555 spin_lock_bh(&b_ptr->lock);
Allan Stephens2d627b92011-01-07 13:00:11 -0500556 b_ptr->blocked = 1;
557 b_ptr->media->disable_bearer(b_ptr);
Allan Stephens4b3743e2011-05-26 13:59:17 -0400558 list_splice_init(&b_ptr->cong_links, &b_ptr->links);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100559 list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
Per Liden4323add2006-01-18 00:38:21 +0100560 tipc_link_delete(l_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100561 }
Allan Stephens3a777ff2011-04-21 13:58:26 -0500562 if (b_ptr->link_req)
563 tipc_disc_delete(b_ptr->link_req);
Allan Stephens2d627b92011-01-07 13:00:11 -0500564 spin_unlock_bh(&b_ptr->lock);
565 memset(b_ptr, 0, sizeof(struct tipc_bearer));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100566}
567
568int tipc_disable_bearer(const char *name)
569{
Allan Stephens2d627b92011-01-07 13:00:11 -0500570 struct tipc_bearer *b_ptr;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100571 int res;
572
Per Liden4323add2006-01-18 00:38:21 +0100573 write_lock_bh(&tipc_net_lock);
Allan Stephens5c216e12011-10-18 11:34:29 -0400574 b_ptr = tipc_bearer_find(name);
Allan Stephensccc901e2010-10-14 13:58:26 +0000575 if (b_ptr == NULL) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400576 pr_warn("Attempt to disable unknown bearer <%s>\n", name);
Allan Stephensccc901e2010-10-14 13:58:26 +0000577 res = -EINVAL;
Allan Stephens28cc9372010-11-30 12:00:56 +0000578 } else {
579 bearer_disable(b_ptr);
580 res = 0;
581 }
Per Liden4323add2006-01-18 00:38:21 +0100582 write_unlock_bh(&tipc_net_lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100583 return res;
584}
585
586
587
Per Liden4323add2006-01-18 00:38:21 +0100588void tipc_bearer_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100589{
590 u32 i;
591
Per Lidenb97bf3f2006-01-02 19:04:38 +0100592 for (i = 0; i < MAX_BEARERS; i++) {
Per Liden4323add2006-01-18 00:38:21 +0100593 if (tipc_bearers[i].active)
Allan Stephensccc901e2010-10-14 13:58:26 +0000594 bearer_disable(&tipc_bearers[i]);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100595 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100596 media_count = 0;
597}