2 * net/tipc/link.c: TIPC link code
4 * Copyright (c) 1996-2007, Ericsson AB
5 * Copyright (c) 2004-2007, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 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.
20 * 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.
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
34 * POSSIBILITY OF SUCH DAMAGE.
44 #include "node_subscr.h"
45 #include "name_distr.h"
47 #include "name_table.h"
54 * Limit for deferred reception queue:
57 #define DEF_QUEUE_LIMIT 256u
63 #define STARTING_EVT 856384768 /* link processing trigger */
64 #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
65 #define TIMEOUT_EVT 560817u /* link timer expired */
68 * The following two 'message types' is really just implementation
69 * data conveniently stored in the message header.
70 * They must not be considered part of the protocol
76 * State value stored in 'exp_msg_count'
79 #define START_CHANGEOVER 100000u
82 * struct link_name - deconstructed link name
83 * @addr_local: network address of node at this end
84 * @if_local: name of interface at this end
85 * @addr_peer: network address of node at far end
86 * @if_peer: name of interface at far end
91 char if_local
[TIPC_MAX_IF_NAME
];
93 char if_peer
[TIPC_MAX_IF_NAME
];
98 /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
101 * struct link_event - link up/down event notification
107 void (*fcn
)(u32
, char *, int);
108 char name
[TIPC_MAX_LINK_NAME
];
113 static void link_handle_out_of_seq_msg(struct link
*l_ptr
,
114 struct sk_buff
*buf
);
115 static void link_recv_proto_msg(struct link
*l_ptr
, struct sk_buff
*buf
);
116 static int link_recv_changeover_msg(struct link
**l_ptr
, struct sk_buff
**buf
);
117 static void link_set_supervision_props(struct link
*l_ptr
, u32 tolerance
);
118 static int link_send_sections_long(struct port
*sender
,
119 struct iovec
const *msg_sect
,
120 u32 num_sect
, u32 destnode
);
121 static void link_check_defragm_bufs(struct link
*l_ptr
);
122 static void link_state_event(struct link
*l_ptr
, u32 event
);
123 static void link_reset_statistics(struct link
*l_ptr
);
124 static void link_print(struct link
*l_ptr
, struct print_buf
*buf
,
128 * Debugging code used by link routines only
130 * When debugging link problems on a system that has multiple links,
131 * the standard TIPC debugging routines may not be useful since they
132 * allow the output from multiple links to be intermixed. For this reason
133 * routines of the form "dbg_link_XXX()" have been created that will capture
134 * debug info into a link's personal print buffer, which can then be dumped
135 * into the TIPC system log (TIPC_LOG) upon request.
137 * To enable per-link debugging, use LINK_LOG_BUF_SIZE to specify the size
138 * of the print buffer used by each link. If LINK_LOG_BUF_SIZE is set to 0,
139 * the dbg_link_XXX() routines simply send their output to the standard
140 * debug print buffer (DBG_OUTPUT), if it has been defined; this can be useful
141 * when there is only a single link in the system being debugged.
144 * - When enabled, LINK_LOG_BUF_SIZE should be set to at least TIPC_PB_MIN_SIZE
145 * - "l_ptr" must be valid when using dbg_link_XXX() macros
148 #define LINK_LOG_BUF_SIZE 0
150 #define dbg_link(fmt, arg...) do {if (LINK_LOG_BUF_SIZE) tipc_printf(&l_ptr->print_buf, fmt, ## arg); } while(0)
151 #define dbg_link_msg(msg, txt) do {if (LINK_LOG_BUF_SIZE) tipc_msg_print(&l_ptr->print_buf, msg, txt); } while(0)
152 #define dbg_link_state(txt) do {if (LINK_LOG_BUF_SIZE) link_print(l_ptr, &l_ptr->print_buf, txt); } while(0)
153 #define dbg_link_dump() do { \
154 if (LINK_LOG_BUF_SIZE) { \
155 tipc_printf(LOG, "\n\nDumping link <%s>:\n", l_ptr->name); \
156 tipc_printbuf_move(LOG, &l_ptr->print_buf); \
160 static void dbg_print_link(struct link
*l_ptr
, const char *str
)
162 if (DBG_OUTPUT
!= TIPC_NULL
)
163 link_print(l_ptr
, DBG_OUTPUT
, str
);
166 static void dbg_print_buf_chain(struct sk_buff
*root_buf
)
168 if (DBG_OUTPUT
!= TIPC_NULL
) {
169 struct sk_buff
*buf
= root_buf
;
172 msg_dbg(buf_msg(buf
), "In chain: ");
179 * Simple link routines
182 static unsigned int align(unsigned int i
)
184 return (i
+ 3) & ~3u;
187 static int link_working_working(struct link
*l_ptr
)
189 return (l_ptr
->state
== WORKING_WORKING
);
192 static int link_working_unknown(struct link
*l_ptr
)
194 return (l_ptr
->state
== WORKING_UNKNOWN
);
197 static int link_reset_unknown(struct link
*l_ptr
)
199 return (l_ptr
->state
== RESET_UNKNOWN
);
202 static int link_reset_reset(struct link
*l_ptr
)
204 return (l_ptr
->state
== RESET_RESET
);
207 static int link_blocked(struct link
*l_ptr
)
209 return (l_ptr
->exp_msg_count
|| l_ptr
->blocked
);
212 static int link_congested(struct link
*l_ptr
)
214 return (l_ptr
->out_queue_size
>= l_ptr
->queue_limit
[0]);
217 static u32
link_max_pkt(struct link
*l_ptr
)
219 return l_ptr
->max_pkt
;
222 static void link_init_max_pkt(struct link
*l_ptr
)
226 max_pkt
= (l_ptr
->b_ptr
->publ
.mtu
& ~3);
227 if (max_pkt
> MAX_MSG_SIZE
)
228 max_pkt
= MAX_MSG_SIZE
;
230 l_ptr
->max_pkt_target
= max_pkt
;
231 if (l_ptr
->max_pkt_target
< MAX_PKT_DEFAULT
)
232 l_ptr
->max_pkt
= l_ptr
->max_pkt_target
;
234 l_ptr
->max_pkt
= MAX_PKT_DEFAULT
;
236 l_ptr
->max_pkt_probes
= 0;
239 static u32
link_next_sent(struct link
*l_ptr
)
242 return msg_seqno(buf_msg(l_ptr
->next_out
));
243 return mod(l_ptr
->next_out_no
);
246 static u32
link_last_sent(struct link
*l_ptr
)
248 return mod(link_next_sent(l_ptr
) - 1);
252 * Simple non-static link routines (i.e. referenced outside this file)
255 int tipc_link_is_up(struct link
*l_ptr
)
259 return (link_working_working(l_ptr
) || link_working_unknown(l_ptr
));
262 int tipc_link_is_active(struct link
*l_ptr
)
264 return ((l_ptr
->owner
->active_links
[0] == l_ptr
) ||
265 (l_ptr
->owner
->active_links
[1] == l_ptr
));
269 * link_name_validate - validate & (optionally) deconstruct link name
270 * @name - ptr to link name string
271 * @name_parts - ptr to area for link name components (or NULL if not needed)
273 * Returns 1 if link name is valid, otherwise 0.
276 static int link_name_validate(const char *name
, struct link_name
*name_parts
)
278 char name_copy
[TIPC_MAX_LINK_NAME
];
284 u32 z_local
, c_local
, n_local
;
285 u32 z_peer
, c_peer
, n_peer
;
289 /* copy link name & ensure length is OK */
291 name_copy
[TIPC_MAX_LINK_NAME
- 1] = 0;
292 /* need above in case non-Posix strncpy() doesn't pad with nulls */
293 strncpy(name_copy
, name
, TIPC_MAX_LINK_NAME
);
294 if (name_copy
[TIPC_MAX_LINK_NAME
- 1] != 0)
297 /* ensure all component parts of link name are present */
299 addr_local
= name_copy
;
300 if ((if_local
= strchr(addr_local
, ':')) == NULL
)
303 if ((addr_peer
= strchr(if_local
, '-')) == NULL
)
306 if_local_len
= addr_peer
- if_local
;
307 if ((if_peer
= strchr(addr_peer
, ':')) == NULL
)
310 if_peer_len
= strlen(if_peer
) + 1;
312 /* validate component parts of link name */
314 if ((sscanf(addr_local
, "%u.%u.%u%c",
315 &z_local
, &c_local
, &n_local
, &dummy
) != 3) ||
316 (sscanf(addr_peer
, "%u.%u.%u%c",
317 &z_peer
, &c_peer
, &n_peer
, &dummy
) != 3) ||
318 (z_local
> 255) || (c_local
> 4095) || (n_local
> 4095) ||
319 (z_peer
> 255) || (c_peer
> 4095) || (n_peer
> 4095) ||
320 (if_local_len
<= 1) || (if_local_len
> TIPC_MAX_IF_NAME
) ||
321 (if_peer_len
<= 1) || (if_peer_len
> TIPC_MAX_IF_NAME
) ||
322 (strspn(if_local
, tipc_alphabet
) != (if_local_len
- 1)) ||
323 (strspn(if_peer
, tipc_alphabet
) != (if_peer_len
- 1)))
326 /* return link name components, if necessary */
329 name_parts
->addr_local
= tipc_addr(z_local
, c_local
, n_local
);
330 strcpy(name_parts
->if_local
, if_local
);
331 name_parts
->addr_peer
= tipc_addr(z_peer
, c_peer
, n_peer
);
332 strcpy(name_parts
->if_peer
, if_peer
);
338 * link_timeout - handle expiration of link timer
339 * @l_ptr: pointer to link
341 * This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
342 * with tipc_link_delete(). (There is no risk that the node will be deleted by
343 * another thread because tipc_link_delete() always cancels the link timer before
344 * tipc_node_delete() is called.)
347 static void link_timeout(struct link
*l_ptr
)
349 tipc_node_lock(l_ptr
->owner
);
351 /* update counters used in statistical profiling of send traffic */
353 l_ptr
->stats
.accu_queue_sz
+= l_ptr
->out_queue_size
;
354 l_ptr
->stats
.queue_sz_counts
++;
356 if (l_ptr
->out_queue_size
> l_ptr
->stats
.max_queue_sz
)
357 l_ptr
->stats
.max_queue_sz
= l_ptr
->out_queue_size
;
359 if (l_ptr
->first_out
) {
360 struct tipc_msg
*msg
= buf_msg(l_ptr
->first_out
);
361 u32 length
= msg_size(msg
);
363 if ((msg_user(msg
) == MSG_FRAGMENTER
)
364 && (msg_type(msg
) == FIRST_FRAGMENT
)) {
365 length
= msg_size(msg_get_wrapped(msg
));
368 l_ptr
->stats
.msg_lengths_total
+= length
;
369 l_ptr
->stats
.msg_length_counts
++;
371 l_ptr
->stats
.msg_length_profile
[0]++;
372 else if (length
<= 256)
373 l_ptr
->stats
.msg_length_profile
[1]++;
374 else if (length
<= 1024)
375 l_ptr
->stats
.msg_length_profile
[2]++;
376 else if (length
<= 4096)
377 l_ptr
->stats
.msg_length_profile
[3]++;
378 else if (length
<= 16384)
379 l_ptr
->stats
.msg_length_profile
[4]++;
380 else if (length
<= 32768)
381 l_ptr
->stats
.msg_length_profile
[5]++;
383 l_ptr
->stats
.msg_length_profile
[6]++;
387 /* do all other link processing performed on a periodic basis */
389 link_check_defragm_bufs(l_ptr
);
391 link_state_event(l_ptr
, TIMEOUT_EVT
);
394 tipc_link_push_queue(l_ptr
);
396 tipc_node_unlock(l_ptr
->owner
);
399 static void link_set_timer(struct link
*l_ptr
, u32 time
)
401 k_start_timer(&l_ptr
->timer
, time
);
405 * tipc_link_create - create a new link
406 * @b_ptr: pointer to associated bearer
407 * @peer: network address of node at other end of link
408 * @media_addr: media address to use when sending messages over link
410 * Returns pointer to link.
413 struct link
*tipc_link_create(struct bearer
*b_ptr
, const u32 peer
,
414 const struct tipc_media_addr
*media_addr
)
417 struct tipc_msg
*msg
;
420 l_ptr
= kzalloc(sizeof(*l_ptr
), GFP_ATOMIC
);
422 warn("Link creation failed, no memory\n");
426 if (LINK_LOG_BUF_SIZE
) {
427 char *pb
= kmalloc(LINK_LOG_BUF_SIZE
, GFP_ATOMIC
);
431 warn("Link creation failed, no memory for print buffer\n");
434 tipc_printbuf_init(&l_ptr
->print_buf
, pb
, LINK_LOG_BUF_SIZE
);
438 if_name
= strchr(b_ptr
->publ
.name
, ':') + 1;
439 sprintf(l_ptr
->name
, "%u.%u.%u:%s-%u.%u.%u:",
440 tipc_zone(tipc_own_addr
), tipc_cluster(tipc_own_addr
),
441 tipc_node(tipc_own_addr
),
443 tipc_zone(peer
), tipc_cluster(peer
), tipc_node(peer
));
444 /* note: peer i/f is appended to link name by reset/activate */
445 memcpy(&l_ptr
->media_addr
, media_addr
, sizeof(*media_addr
));
446 l_ptr
->checkpoint
= 1;
447 l_ptr
->b_ptr
= b_ptr
;
448 link_set_supervision_props(l_ptr
, b_ptr
->media
->tolerance
);
449 l_ptr
->state
= RESET_UNKNOWN
;
451 l_ptr
->pmsg
= (struct tipc_msg
*)&l_ptr
->proto_msg
;
453 msg_init(msg
, LINK_PROTOCOL
, RESET_MSG
, TIPC_OK
, INT_H_SIZE
, l_ptr
->addr
);
454 msg_set_size(msg
, sizeof(l_ptr
->proto_msg
));
455 msg_set_session(msg
, tipc_random
);
456 msg_set_bearer_id(msg
, b_ptr
->identity
);
457 strcpy((char *)msg_data(msg
), if_name
);
459 l_ptr
->priority
= b_ptr
->priority
;
460 tipc_link_set_queue_limits(l_ptr
, b_ptr
->media
->window
);
462 link_init_max_pkt(l_ptr
);
464 l_ptr
->next_out_no
= 1;
465 INIT_LIST_HEAD(&l_ptr
->waiting_ports
);
467 link_reset_statistics(l_ptr
);
469 l_ptr
->owner
= tipc_node_attach_link(l_ptr
);
471 if (LINK_LOG_BUF_SIZE
)
472 kfree(l_ptr
->print_buf
.buf
);
477 k_init_timer(&l_ptr
->timer
, (Handler
)link_timeout
, (unsigned long)l_ptr
);
478 list_add_tail(&l_ptr
->link_list
, &b_ptr
->links
);
479 tipc_k_signal((Handler
)tipc_link_start
, (unsigned long)l_ptr
);
481 dbg("tipc_link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
482 l_ptr
->tolerance
, l_ptr
->continuity_interval
, l_ptr
->abort_limit
);
488 * tipc_link_delete - delete a link
489 * @l_ptr: pointer to link
491 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
492 * This routine must not grab the node lock until after link timer cancellation
493 * to avoid a potential deadlock situation.
496 void tipc_link_delete(struct link
*l_ptr
)
499 err("Attempt to delete non-existent link\n");
503 dbg("tipc_link_delete()\n");
505 k_cancel_timer(&l_ptr
->timer
);
507 tipc_node_lock(l_ptr
->owner
);
508 tipc_link_reset(l_ptr
);
509 tipc_node_detach_link(l_ptr
->owner
, l_ptr
);
510 tipc_link_stop(l_ptr
);
511 list_del_init(&l_ptr
->link_list
);
512 if (LINK_LOG_BUF_SIZE
)
513 kfree(l_ptr
->print_buf
.buf
);
514 tipc_node_unlock(l_ptr
->owner
);
515 k_term_timer(&l_ptr
->timer
);
519 void tipc_link_start(struct link
*l_ptr
)
521 dbg("tipc_link_start %x\n", l_ptr
);
522 link_state_event(l_ptr
, STARTING_EVT
);
526 * link_schedule_port - schedule port for deferred sending
527 * @l_ptr: pointer to link
528 * @origport: reference to sending port
529 * @sz: amount of data to be sent
531 * Schedules port for renewed sending of messages after link congestion
535 static int link_schedule_port(struct link
*l_ptr
, u32 origport
, u32 sz
)
539 spin_lock_bh(&tipc_port_list_lock
);
540 p_ptr
= tipc_port_lock(origport
);
544 if (!list_empty(&p_ptr
->wait_list
))
546 p_ptr
->congested_link
= l_ptr
;
547 p_ptr
->publ
.congested
= 1;
548 p_ptr
->waiting_pkts
= 1 + ((sz
- 1) / link_max_pkt(l_ptr
));
549 list_add_tail(&p_ptr
->wait_list
, &l_ptr
->waiting_ports
);
550 l_ptr
->stats
.link_congs
++;
552 tipc_port_unlock(p_ptr
);
554 spin_unlock_bh(&tipc_port_list_lock
);
558 void tipc_link_wakeup_ports(struct link
*l_ptr
, int all
)
561 struct port
*temp_p_ptr
;
562 int win
= l_ptr
->queue_limit
[0] - l_ptr
->out_queue_size
;
568 if (!spin_trylock_bh(&tipc_port_list_lock
))
570 if (link_congested(l_ptr
))
572 list_for_each_entry_safe(p_ptr
, temp_p_ptr
, &l_ptr
->waiting_ports
,
576 list_del_init(&p_ptr
->wait_list
);
577 p_ptr
->congested_link
= NULL
;
578 spin_lock_bh(p_ptr
->publ
.lock
);
579 p_ptr
->publ
.congested
= 0;
580 p_ptr
->wakeup(&p_ptr
->publ
);
581 win
-= p_ptr
->waiting_pkts
;
582 spin_unlock_bh(p_ptr
->publ
.lock
);
586 spin_unlock_bh(&tipc_port_list_lock
);
590 * link_release_outqueue - purge link's outbound message queue
591 * @l_ptr: pointer to link
594 static void link_release_outqueue(struct link
*l_ptr
)
596 struct sk_buff
*buf
= l_ptr
->first_out
;
597 struct sk_buff
*next
;
604 l_ptr
->first_out
= NULL
;
605 l_ptr
->out_queue_size
= 0;
609 * tipc_link_reset_fragments - purge link's inbound message fragments queue
610 * @l_ptr: pointer to link
613 void tipc_link_reset_fragments(struct link
*l_ptr
)
615 struct sk_buff
*buf
= l_ptr
->defragm_buf
;
616 struct sk_buff
*next
;
623 l_ptr
->defragm_buf
= NULL
;
627 * tipc_link_stop - purge all inbound and outbound messages associated with link
628 * @l_ptr: pointer to link
631 void tipc_link_stop(struct link
*l_ptr
)
634 struct sk_buff
*next
;
636 buf
= l_ptr
->oldest_deferred_in
;
643 buf
= l_ptr
->first_out
;
650 tipc_link_reset_fragments(l_ptr
);
652 buf_discard(l_ptr
->proto_msg_queue
);
653 l_ptr
->proto_msg_queue
= NULL
;
658 /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
660 static void link_recv_event(struct link_event
*ev
)
662 ev
->fcn(ev
->addr
, ev
->name
, ev
->up
);
666 static void link_send_event(void (*fcn
)(u32 a
, char *n
, int up
),
667 struct link
*l_ptr
, int up
)
669 struct link_event
*ev
;
671 ev
= kmalloc(sizeof(*ev
), GFP_ATOMIC
);
673 warn("Link event allocation failure\n");
676 ev
->addr
= l_ptr
->addr
;
679 memcpy(ev
->name
, l_ptr
->name
, TIPC_MAX_LINK_NAME
);
680 tipc_k_signal((Handler
)link_recv_event
, (unsigned long)ev
);
685 #define link_send_event(fcn, l_ptr, up) do { } while (0)
689 void tipc_link_reset(struct link
*l_ptr
)
692 u32 prev_state
= l_ptr
->state
;
693 u32 checkpoint
= l_ptr
->next_in_no
;
694 int was_active_link
= tipc_link_is_active(l_ptr
);
696 msg_set_session(l_ptr
->pmsg
, msg_session(l_ptr
->pmsg
) + 1);
698 /* Link is down, accept any session: */
699 l_ptr
->peer_session
= 0;
701 /* Prepare for max packet size negotiation */
702 link_init_max_pkt(l_ptr
);
704 l_ptr
->state
= RESET_UNKNOWN
;
705 dbg_link_state("Resetting Link\n");
707 if ((prev_state
== RESET_UNKNOWN
) || (prev_state
== RESET_RESET
))
710 tipc_node_link_down(l_ptr
->owner
, l_ptr
);
711 tipc_bearer_remove_dest(l_ptr
->b_ptr
, l_ptr
->addr
);
713 tipc_printf(TIPC_CONS
, "\nReset link <%s>\n", l_ptr
->name
);
716 if (was_active_link
&& tipc_node_has_active_links(l_ptr
->owner
) &&
717 l_ptr
->owner
->permit_changeover
) {
718 l_ptr
->reset_checkpoint
= checkpoint
;
719 l_ptr
->exp_msg_count
= START_CHANGEOVER
;
722 /* Clean up all queues: */
724 link_release_outqueue(l_ptr
);
725 buf_discard(l_ptr
->proto_msg_queue
);
726 l_ptr
->proto_msg_queue
= NULL
;
727 buf
= l_ptr
->oldest_deferred_in
;
729 struct sk_buff
*next
= buf
->next
;
733 if (!list_empty(&l_ptr
->waiting_ports
))
734 tipc_link_wakeup_ports(l_ptr
, 1);
736 l_ptr
->retransm_queue_head
= 0;
737 l_ptr
->retransm_queue_size
= 0;
738 l_ptr
->last_out
= NULL
;
739 l_ptr
->first_out
= NULL
;
740 l_ptr
->next_out
= NULL
;
741 l_ptr
->unacked_window
= 0;
742 l_ptr
->checkpoint
= 1;
743 l_ptr
->next_out_no
= 1;
744 l_ptr
->deferred_inqueue_sz
= 0;
745 l_ptr
->oldest_deferred_in
= NULL
;
746 l_ptr
->newest_deferred_in
= NULL
;
747 l_ptr
->fsm_msg_cnt
= 0;
748 l_ptr
->stale_count
= 0;
749 link_reset_statistics(l_ptr
);
751 link_send_event(tipc_cfg_link_event
, l_ptr
, 0);
752 if (!in_own_cluster(l_ptr
->addr
))
753 link_send_event(tipc_disc_link_event
, l_ptr
, 0);
757 static void link_activate(struct link
*l_ptr
)
759 l_ptr
->next_in_no
= l_ptr
->stats
.recv_info
= 1;
760 tipc_node_link_up(l_ptr
->owner
, l_ptr
);
761 tipc_bearer_add_dest(l_ptr
->b_ptr
, l_ptr
->addr
);
762 link_send_event(tipc_cfg_link_event
, l_ptr
, 1);
763 if (!in_own_cluster(l_ptr
->addr
))
764 link_send_event(tipc_disc_link_event
, l_ptr
, 1);
768 * link_state_event - link finite state machine
769 * @l_ptr: pointer to link
770 * @event: state machine event to process
773 static void link_state_event(struct link
*l_ptr
, unsigned event
)
776 u32 cont_intv
= l_ptr
->continuity_interval
;
778 if (!l_ptr
->started
&& (event
!= STARTING_EVT
))
779 return; /* Not yet. */
781 if (link_blocked(l_ptr
)) {
782 if (event
== TIMEOUT_EVT
) {
783 link_set_timer(l_ptr
, cont_intv
);
785 return; /* Changeover going on */
787 dbg_link("STATE_EV: <%s> ", l_ptr
->name
);
789 switch (l_ptr
->state
) {
790 case WORKING_WORKING
:
793 case TRAFFIC_MSG_EVT
:
801 if (l_ptr
->next_in_no
!= l_ptr
->checkpoint
) {
802 l_ptr
->checkpoint
= l_ptr
->next_in_no
;
803 if (tipc_bclink_acks_missing(l_ptr
->owner
)) {
804 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
,
806 l_ptr
->fsm_msg_cnt
++;
807 } else if (l_ptr
->max_pkt
< l_ptr
->max_pkt_target
) {
808 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
,
810 l_ptr
->fsm_msg_cnt
++;
812 link_set_timer(l_ptr
, cont_intv
);
815 dbg_link(" -> WU\n");
816 l_ptr
->state
= WORKING_UNKNOWN
;
817 l_ptr
->fsm_msg_cnt
= 0;
818 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
, 1, 0, 0, 0, 0);
819 l_ptr
->fsm_msg_cnt
++;
820 link_set_timer(l_ptr
, cont_intv
/ 4);
823 dbg_link("RES -> RR\n");
824 info("Resetting link <%s>, requested by peer\n",
826 tipc_link_reset(l_ptr
);
827 l_ptr
->state
= RESET_RESET
;
828 l_ptr
->fsm_msg_cnt
= 0;
829 tipc_link_send_proto_msg(l_ptr
, ACTIVATE_MSG
, 0, 0, 0, 0, 0);
830 l_ptr
->fsm_msg_cnt
++;
831 link_set_timer(l_ptr
, cont_intv
);
834 err("Unknown link event %u in WW state\n", event
);
837 case WORKING_UNKNOWN
:
840 case TRAFFIC_MSG_EVT
:
843 dbg_link("ACT -> WW\n");
844 l_ptr
->state
= WORKING_WORKING
;
845 l_ptr
->fsm_msg_cnt
= 0;
846 link_set_timer(l_ptr
, cont_intv
);
849 dbg_link("RES -> RR\n");
850 info("Resetting link <%s>, requested by peer "
851 "while probing\n", l_ptr
->name
);
852 tipc_link_reset(l_ptr
);
853 l_ptr
->state
= RESET_RESET
;
854 l_ptr
->fsm_msg_cnt
= 0;
855 tipc_link_send_proto_msg(l_ptr
, ACTIVATE_MSG
, 0, 0, 0, 0, 0);
856 l_ptr
->fsm_msg_cnt
++;
857 link_set_timer(l_ptr
, cont_intv
);
861 if (l_ptr
->next_in_no
!= l_ptr
->checkpoint
) {
862 dbg_link("-> WW \n");
863 l_ptr
->state
= WORKING_WORKING
;
864 l_ptr
->fsm_msg_cnt
= 0;
865 l_ptr
->checkpoint
= l_ptr
->next_in_no
;
866 if (tipc_bclink_acks_missing(l_ptr
->owner
)) {
867 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
,
869 l_ptr
->fsm_msg_cnt
++;
871 link_set_timer(l_ptr
, cont_intv
);
872 } else if (l_ptr
->fsm_msg_cnt
< l_ptr
->abort_limit
) {
873 dbg_link("Probing %u/%u,timer = %u ms)\n",
874 l_ptr
->fsm_msg_cnt
, l_ptr
->abort_limit
,
876 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
,
878 l_ptr
->fsm_msg_cnt
++;
879 link_set_timer(l_ptr
, cont_intv
/ 4);
880 } else { /* Link has failed */
881 dbg_link("-> RU (%u probes unanswered)\n",
883 warn("Resetting link <%s>, peer not responding\n",
885 tipc_link_reset(l_ptr
);
886 l_ptr
->state
= RESET_UNKNOWN
;
887 l_ptr
->fsm_msg_cnt
= 0;
888 tipc_link_send_proto_msg(l_ptr
, RESET_MSG
,
890 l_ptr
->fsm_msg_cnt
++;
891 link_set_timer(l_ptr
, cont_intv
);
895 err("Unknown link event %u in WU state\n", event
);
901 case TRAFFIC_MSG_EVT
:
905 other
= l_ptr
->owner
->active_links
[0];
906 if (other
&& link_working_unknown(other
)) {
910 dbg_link("ACT -> WW\n");
911 l_ptr
->state
= WORKING_WORKING
;
912 l_ptr
->fsm_msg_cnt
= 0;
913 link_activate(l_ptr
);
914 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
, 1, 0, 0, 0, 0);
915 l_ptr
->fsm_msg_cnt
++;
916 link_set_timer(l_ptr
, cont_intv
);
920 dbg_link(" -> RR\n");
921 l_ptr
->state
= RESET_RESET
;
922 l_ptr
->fsm_msg_cnt
= 0;
923 tipc_link_send_proto_msg(l_ptr
, ACTIVATE_MSG
, 1, 0, 0, 0, 0);
924 l_ptr
->fsm_msg_cnt
++;
925 link_set_timer(l_ptr
, cont_intv
);
933 tipc_link_send_proto_msg(l_ptr
, RESET_MSG
, 0, 0, 0, 0, 0);
934 l_ptr
->fsm_msg_cnt
++;
935 link_set_timer(l_ptr
, cont_intv
);
938 err("Unknown link event %u in RU state\n", event
);
944 case TRAFFIC_MSG_EVT
:
948 other
= l_ptr
->owner
->active_links
[0];
949 if (other
&& link_working_unknown(other
)) {
953 dbg_link("ACT -> WW\n");
954 l_ptr
->state
= WORKING_WORKING
;
955 l_ptr
->fsm_msg_cnt
= 0;
956 link_activate(l_ptr
);
957 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
, 1, 0, 0, 0, 0);
958 l_ptr
->fsm_msg_cnt
++;
959 link_set_timer(l_ptr
, cont_intv
);
966 tipc_link_send_proto_msg(l_ptr
, ACTIVATE_MSG
, 0, 0, 0, 0, 0);
967 l_ptr
->fsm_msg_cnt
++;
968 link_set_timer(l_ptr
, cont_intv
);
969 dbg_link("fsm_msg_cnt %u\n", l_ptr
->fsm_msg_cnt
);
972 err("Unknown link event %u in RR state\n", event
);
976 err("Unknown link state %u/%u\n", l_ptr
->state
, event
);
981 * link_bundle_buf(): Append contents of a buffer to
982 * the tail of an existing one.
985 static int link_bundle_buf(struct link
*l_ptr
,
986 struct sk_buff
*bundler
,
989 struct tipc_msg
*bundler_msg
= buf_msg(bundler
);
990 struct tipc_msg
*msg
= buf_msg(buf
);
991 u32 size
= msg_size(msg
);
992 u32 bundle_size
= msg_size(bundler_msg
);
993 u32 to_pos
= align(bundle_size
);
994 u32 pad
= to_pos
- bundle_size
;
996 if (msg_user(bundler_msg
) != MSG_BUNDLER
)
998 if (msg_type(bundler_msg
) != OPEN_MSG
)
1000 if (skb_tailroom(bundler
) < (pad
+ size
))
1002 if (link_max_pkt(l_ptr
) < (to_pos
+ size
))
1005 skb_put(bundler
, pad
+ size
);
1006 skb_copy_to_linear_data_offset(bundler
, to_pos
, buf
->data
, size
);
1007 msg_set_size(bundler_msg
, to_pos
+ size
);
1008 msg_set_msgcnt(bundler_msg
, msg_msgcnt(bundler_msg
) + 1);
1009 dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
1010 msg_msgcnt(bundler_msg
), size
, to_pos
, msg_seqno(bundler_msg
));
1011 msg_dbg(msg
, "PACKD:");
1013 l_ptr
->stats
.sent_bundled
++;
1017 static void link_add_to_outqueue(struct link
*l_ptr
,
1018 struct sk_buff
*buf
,
1019 struct tipc_msg
*msg
)
1021 u32 ack
= mod(l_ptr
->next_in_no
- 1);
1022 u32 seqno
= mod(l_ptr
->next_out_no
++);
1024 msg_set_word(msg
, 2, ((ack
<< 16) | seqno
));
1025 msg_set_bcast_ack(msg
, l_ptr
->owner
->bclink
.last_in
);
1027 if (l_ptr
->first_out
) {
1028 l_ptr
->last_out
->next
= buf
;
1029 l_ptr
->last_out
= buf
;
1031 l_ptr
->first_out
= l_ptr
->last_out
= buf
;
1032 l_ptr
->out_queue_size
++;
1036 * tipc_link_send_buf() is the 'full path' for messages, called from
1037 * inside TIPC when the 'fast path' in tipc_send_buf
1038 * has failed, and from link_send()
1041 int tipc_link_send_buf(struct link
*l_ptr
, struct sk_buff
*buf
)
1043 struct tipc_msg
*msg
= buf_msg(buf
);
1044 u32 size
= msg_size(msg
);
1045 u32 dsz
= msg_data_sz(msg
);
1046 u32 queue_size
= l_ptr
->out_queue_size
;
1047 u32 imp
= msg_tot_importance(msg
);
1048 u32 queue_limit
= l_ptr
->queue_limit
[imp
];
1049 u32 max_packet
= link_max_pkt(l_ptr
);
1051 msg_set_prevnode(msg
, tipc_own_addr
); /* If routed message */
1053 /* Match msg importance against queue limits: */
1055 if (unlikely(queue_size
>= queue_limit
)) {
1056 if (imp
<= TIPC_CRITICAL_IMPORTANCE
) {
1057 return link_schedule_port(l_ptr
, msg_origport(msg
),
1060 msg_dbg(msg
, "TIPC: Congestion, throwing away\n");
1062 if (imp
> CONN_MANAGER
) {
1063 warn("Resetting link <%s>, send queue full", l_ptr
->name
);
1064 tipc_link_reset(l_ptr
);
1069 /* Fragmentation needed ? */
1071 if (size
> max_packet
)
1072 return tipc_link_send_long_buf(l_ptr
, buf
);
1074 /* Packet can be queued or sent: */
1076 if (queue_size
> l_ptr
->stats
.max_queue_sz
)
1077 l_ptr
->stats
.max_queue_sz
= queue_size
;
1079 if (likely(!tipc_bearer_congested(l_ptr
->b_ptr
, l_ptr
) &&
1080 !link_congested(l_ptr
))) {
1081 link_add_to_outqueue(l_ptr
, buf
, msg
);
1083 if (likely(tipc_bearer_send(l_ptr
->b_ptr
, buf
, &l_ptr
->media_addr
))) {
1084 l_ptr
->unacked_window
= 0;
1086 tipc_bearer_schedule(l_ptr
->b_ptr
, l_ptr
);
1087 l_ptr
->stats
.bearer_congs
++;
1088 l_ptr
->next_out
= buf
;
1092 /* Congestion: can message be bundled ?: */
1094 if ((msg_user(msg
) != CHANGEOVER_PROTOCOL
) &&
1095 (msg_user(msg
) != MSG_FRAGMENTER
)) {
1097 /* Try adding message to an existing bundle */
1099 if (l_ptr
->next_out
&&
1100 link_bundle_buf(l_ptr
, l_ptr
->last_out
, buf
)) {
1101 tipc_bearer_resolve_congestion(l_ptr
->b_ptr
, l_ptr
);
1105 /* Try creating a new bundle */
1107 if (size
<= max_packet
* 2 / 3) {
1108 struct sk_buff
*bundler
= buf_acquire(max_packet
);
1109 struct tipc_msg bundler_hdr
;
1112 msg_init(&bundler_hdr
, MSG_BUNDLER
, OPEN_MSG
,
1113 TIPC_OK
, INT_H_SIZE
, l_ptr
->addr
);
1114 skb_copy_to_linear_data(bundler
, &bundler_hdr
,
1116 skb_trim(bundler
, INT_H_SIZE
);
1117 link_bundle_buf(l_ptr
, bundler
, buf
);
1120 l_ptr
->stats
.sent_bundles
++;
1124 if (!l_ptr
->next_out
)
1125 l_ptr
->next_out
= buf
;
1126 link_add_to_outqueue(l_ptr
, buf
, msg
);
1127 tipc_bearer_resolve_congestion(l_ptr
->b_ptr
, l_ptr
);
1132 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
1133 * not been selected yet, and the the owner node is not locked
1134 * Called by TIPC internal users, e.g. the name distributor
1137 int tipc_link_send(struct sk_buff
*buf
, u32 dest
, u32 selector
)
1141 int res
= -ELINKCONG
;
1143 read_lock_bh(&tipc_net_lock
);
1144 n_ptr
= tipc_node_select(dest
, selector
);
1146 tipc_node_lock(n_ptr
);
1147 l_ptr
= n_ptr
->active_links
[selector
& 1];
1149 dbg("tipc_link_send: found link %x for dest %x\n", l_ptr
, dest
);
1150 res
= tipc_link_send_buf(l_ptr
, buf
);
1152 dbg("Attempt to send msg to unreachable node:\n");
1153 msg_dbg(buf_msg(buf
),">>>");
1156 tipc_node_unlock(n_ptr
);
1158 dbg("Attempt to send msg to unknown node:\n");
1159 msg_dbg(buf_msg(buf
),">>>");
1162 read_unlock_bh(&tipc_net_lock
);
1167 * link_send_buf_fast: Entry for data messages where the
1168 * destination link is known and the header is complete,
1169 * inclusive total message length. Very time critical.
1170 * Link is locked. Returns user data length.
1173 static int link_send_buf_fast(struct link
*l_ptr
, struct sk_buff
*buf
,
1176 struct tipc_msg
*msg
= buf_msg(buf
);
1177 int res
= msg_data_sz(msg
);
1179 if (likely(!link_congested(l_ptr
))) {
1180 if (likely(msg_size(msg
) <= link_max_pkt(l_ptr
))) {
1181 if (likely(list_empty(&l_ptr
->b_ptr
->cong_links
))) {
1182 link_add_to_outqueue(l_ptr
, buf
, msg
);
1183 if (likely(tipc_bearer_send(l_ptr
->b_ptr
, buf
,
1184 &l_ptr
->media_addr
))) {
1185 l_ptr
->unacked_window
= 0;
1186 msg_dbg(msg
,"SENT_FAST:");
1189 dbg("failed sent fast...\n");
1190 tipc_bearer_schedule(l_ptr
->b_ptr
, l_ptr
);
1191 l_ptr
->stats
.bearer_congs
++;
1192 l_ptr
->next_out
= buf
;
1197 *used_max_pkt
= link_max_pkt(l_ptr
);
1199 return tipc_link_send_buf(l_ptr
, buf
); /* All other cases */
1203 * tipc_send_buf_fast: Entry for data messages where the
1204 * destination node is known and the header is complete,
1205 * inclusive total message length.
1206 * Returns user data length.
1208 int tipc_send_buf_fast(struct sk_buff
*buf
, u32 destnode
)
1213 u32 selector
= msg_origport(buf_msg(buf
)) & 1;
1216 if (destnode
== tipc_own_addr
)
1217 return tipc_port_recv_msg(buf
);
1219 read_lock_bh(&tipc_net_lock
);
1220 n_ptr
= tipc_node_select(destnode
, selector
);
1221 if (likely(n_ptr
)) {
1222 tipc_node_lock(n_ptr
);
1223 l_ptr
= n_ptr
->active_links
[selector
];
1224 dbg("send_fast: buf %x selected %x, destnode = %x\n",
1225 buf
, l_ptr
, destnode
);
1226 if (likely(l_ptr
)) {
1227 res
= link_send_buf_fast(l_ptr
, buf
, &dummy
);
1228 tipc_node_unlock(n_ptr
);
1229 read_unlock_bh(&tipc_net_lock
);
1232 tipc_node_unlock(n_ptr
);
1234 read_unlock_bh(&tipc_net_lock
);
1235 res
= msg_data_sz(buf_msg(buf
));
1236 tipc_reject_msg(buf
, TIPC_ERR_NO_NODE
);
1242 * tipc_link_send_sections_fast: Entry for messages where the
1243 * destination processor is known and the header is complete,
1244 * except for total message length.
1245 * Returns user data length or errno.
1247 int tipc_link_send_sections_fast(struct port
*sender
,
1248 struct iovec
const *msg_sect
,
1252 struct tipc_msg
*hdr
= &sender
->publ
.phdr
;
1254 struct sk_buff
*buf
;
1257 u32 selector
= msg_origport(hdr
) & 1;
1261 * Try building message using port's max_pkt hint.
1262 * (Must not hold any locks while building message.)
1265 res
= msg_build(hdr
, msg_sect
, num_sect
, sender
->publ
.max_pkt
,
1266 !sender
->user_port
, &buf
);
1268 read_lock_bh(&tipc_net_lock
);
1269 node
= tipc_node_select(destaddr
, selector
);
1271 tipc_node_lock(node
);
1272 l_ptr
= node
->active_links
[selector
];
1273 if (likely(l_ptr
)) {
1275 res
= link_send_buf_fast(l_ptr
, buf
,
1276 &sender
->publ
.max_pkt
);
1277 if (unlikely(res
< 0))
1280 tipc_node_unlock(node
);
1281 read_unlock_bh(&tipc_net_lock
);
1285 /* Exit if build request was invalid */
1287 if (unlikely(res
< 0))
1290 /* Exit if link (or bearer) is congested */
1292 if (link_congested(l_ptr
) ||
1293 !list_empty(&l_ptr
->b_ptr
->cong_links
)) {
1294 res
= link_schedule_port(l_ptr
,
1295 sender
->publ
.ref
, res
);
1300 * Message size exceeds max_pkt hint; update hint,
1301 * then re-try fast path or fragment the message
1304 sender
->publ
.max_pkt
= link_max_pkt(l_ptr
);
1305 tipc_node_unlock(node
);
1306 read_unlock_bh(&tipc_net_lock
);
1309 if ((msg_hdr_sz(hdr
) + res
) <= sender
->publ
.max_pkt
)
1312 return link_send_sections_long(sender
, msg_sect
,
1313 num_sect
, destaddr
);
1315 tipc_node_unlock(node
);
1317 read_unlock_bh(&tipc_net_lock
);
1319 /* Couldn't find a link to the destination node */
1322 return tipc_reject_msg(buf
, TIPC_ERR_NO_NODE
);
1324 return tipc_port_reject_sections(sender
, hdr
, msg_sect
, num_sect
,
1330 * link_send_sections_long(): Entry for long messages where the
1331 * destination node is known and the header is complete,
1332 * inclusive total message length.
1333 * Link and bearer congestion status have been checked to be ok,
1334 * and are ignored if they change.
1336 * Note that fragments do not use the full link MTU so that they won't have
1337 * to undergo refragmentation if link changeover causes them to be sent
1338 * over another link with an additional tunnel header added as prefix.
1339 * (Refragmentation will still occur if the other link has a smaller MTU.)
1341 * Returns user data length or errno.
1343 static int link_send_sections_long(struct port
*sender
,
1344 struct iovec
const *msg_sect
,
1350 struct tipc_msg
*hdr
= &sender
->publ
.phdr
;
1351 u32 dsz
= msg_data_sz(hdr
);
1352 u32 max_pkt
,fragm_sz
,rest
;
1353 struct tipc_msg fragm_hdr
;
1354 struct sk_buff
*buf
,*buf_chain
,*prev
;
1355 u32 fragm_crs
,fragm_rest
,hsz
,sect_rest
;
1356 const unchar
*sect_crs
;
1362 max_pkt
= sender
->publ
.max_pkt
- INT_H_SIZE
;
1363 /* leave room for tunnel header in case of link changeover */
1364 fragm_sz
= max_pkt
- INT_H_SIZE
;
1365 /* leave room for fragmentation header in each fragment */
1373 /* Prepare reusable fragment header: */
1375 msg_dbg(hdr
, ">FRAGMENTING>");
1376 msg_init(&fragm_hdr
, MSG_FRAGMENTER
, FIRST_FRAGMENT
,
1377 TIPC_OK
, INT_H_SIZE
, msg_destnode(hdr
));
1378 msg_set_link_selector(&fragm_hdr
, sender
->publ
.ref
);
1379 msg_set_size(&fragm_hdr
, max_pkt
);
1380 msg_set_fragm_no(&fragm_hdr
, 1);
1382 /* Prepare header of first fragment: */
1384 buf_chain
= buf
= buf_acquire(max_pkt
);
1388 skb_copy_to_linear_data(buf
, &fragm_hdr
, INT_H_SIZE
);
1389 hsz
= msg_hdr_sz(hdr
);
1390 skb_copy_to_linear_data_offset(buf
, INT_H_SIZE
, hdr
, hsz
);
1391 msg_dbg(buf_msg(buf
), ">BUILD>");
1393 /* Chop up message: */
1395 fragm_crs
= INT_H_SIZE
+ hsz
;
1396 fragm_rest
= fragm_sz
- hsz
;
1398 do { /* For all sections */
1402 sect_rest
= msg_sect
[++curr_sect
].iov_len
;
1403 sect_crs
= (const unchar
*)msg_sect
[curr_sect
].iov_base
;
1406 if (sect_rest
< fragm_rest
)
1411 if (likely(!sender
->user_port
)) {
1412 if (copy_from_user(buf
->data
+ fragm_crs
, sect_crs
, sz
)) {
1414 for (; buf_chain
; buf_chain
= buf
) {
1415 buf
= buf_chain
->next
;
1416 buf_discard(buf_chain
);
1421 skb_copy_to_linear_data_offset(buf
, fragm_crs
,
1429 if (!fragm_rest
&& rest
) {
1431 /* Initiate new fragment: */
1432 if (rest
<= fragm_sz
) {
1434 msg_set_type(&fragm_hdr
,LAST_FRAGMENT
);
1436 msg_set_type(&fragm_hdr
, FRAGMENT
);
1438 msg_set_size(&fragm_hdr
, fragm_sz
+ INT_H_SIZE
);
1439 msg_set_fragm_no(&fragm_hdr
, ++fragm_no
);
1441 buf
= buf_acquire(fragm_sz
+ INT_H_SIZE
);
1447 skb_copy_to_linear_data(buf
, &fragm_hdr
, INT_H_SIZE
);
1448 fragm_crs
= INT_H_SIZE
;
1449 fragm_rest
= fragm_sz
;
1450 msg_dbg(buf_msg(buf
)," >BUILD>");
1456 * Now we have a buffer chain. Select a link and check
1457 * that packet size is still OK
1459 node
= tipc_node_select(destaddr
, sender
->publ
.ref
& 1);
1461 tipc_node_lock(node
);
1462 l_ptr
= node
->active_links
[sender
->publ
.ref
& 1];
1464 tipc_node_unlock(node
);
1467 if (link_max_pkt(l_ptr
) < max_pkt
) {
1468 sender
->publ
.max_pkt
= link_max_pkt(l_ptr
);
1469 tipc_node_unlock(node
);
1470 for (; buf_chain
; buf_chain
= buf
) {
1471 buf
= buf_chain
->next
;
1472 buf_discard(buf_chain
);
1478 for (; buf_chain
; buf_chain
= buf
) {
1479 buf
= buf_chain
->next
;
1480 buf_discard(buf_chain
);
1482 return tipc_port_reject_sections(sender
, hdr
, msg_sect
, num_sect
,
1486 /* Append whole chain to send queue: */
1489 l_ptr
->long_msg_seq_no
= mod(l_ptr
->long_msg_seq_no
+ 1);
1490 if (!l_ptr
->next_out
)
1491 l_ptr
->next_out
= buf_chain
;
1492 l_ptr
->stats
.sent_fragmented
++;
1494 struct sk_buff
*next
= buf
->next
;
1495 struct tipc_msg
*msg
= buf_msg(buf
);
1497 l_ptr
->stats
.sent_fragments
++;
1498 msg_set_long_msgno(msg
, l_ptr
->long_msg_seq_no
);
1499 link_add_to_outqueue(l_ptr
, buf
, msg
);
1500 msg_dbg(msg
, ">ADD>");
1504 /* Send it, if possible: */
1506 tipc_link_push_queue(l_ptr
);
1507 tipc_node_unlock(node
);
1512 * tipc_link_push_packet: Push one unsent packet to the media
1514 u32
tipc_link_push_packet(struct link
*l_ptr
)
1516 struct sk_buff
*buf
= l_ptr
->first_out
;
1517 u32 r_q_size
= l_ptr
->retransm_queue_size
;
1518 u32 r_q_head
= l_ptr
->retransm_queue_head
;
1520 /* Step to position where retransmission failed, if any, */
1521 /* consider that buffers may have been released in meantime */
1523 if (r_q_size
&& buf
) {
1524 u32 last
= lesser(mod(r_q_head
+ r_q_size
),
1525 link_last_sent(l_ptr
));
1526 u32 first
= msg_seqno(buf_msg(buf
));
1528 while (buf
&& less(first
, r_q_head
)) {
1529 first
= mod(first
+ 1);
1532 l_ptr
->retransm_queue_head
= r_q_head
= first
;
1533 l_ptr
->retransm_queue_size
= r_q_size
= mod(last
- first
);
1536 /* Continue retransmission now, if there is anything: */
1538 if (r_q_size
&& buf
&& !skb_cloned(buf
)) {
1539 msg_set_ack(buf_msg(buf
), mod(l_ptr
->next_in_no
- 1));
1540 msg_set_bcast_ack(buf_msg(buf
), l_ptr
->owner
->bclink
.last_in
);
1541 if (tipc_bearer_send(l_ptr
->b_ptr
, buf
, &l_ptr
->media_addr
)) {
1542 msg_dbg(buf_msg(buf
), ">DEF-RETR>");
1543 l_ptr
->retransm_queue_head
= mod(++r_q_head
);
1544 l_ptr
->retransm_queue_size
= --r_q_size
;
1545 l_ptr
->stats
.retransmitted
++;
1548 l_ptr
->stats
.bearer_congs
++;
1549 msg_dbg(buf_msg(buf
), "|>DEF-RETR>");
1554 /* Send deferred protocol message, if any: */
1556 buf
= l_ptr
->proto_msg_queue
;
1558 msg_set_ack(buf_msg(buf
), mod(l_ptr
->next_in_no
- 1));
1559 msg_set_bcast_ack(buf_msg(buf
),l_ptr
->owner
->bclink
.last_in
);
1560 if (tipc_bearer_send(l_ptr
->b_ptr
, buf
, &l_ptr
->media_addr
)) {
1561 msg_dbg(buf_msg(buf
), ">DEF-PROT>");
1562 l_ptr
->unacked_window
= 0;
1564 l_ptr
->proto_msg_queue
= NULL
;
1567 msg_dbg(buf_msg(buf
), "|>DEF-PROT>");
1568 l_ptr
->stats
.bearer_congs
++;
1573 /* Send one deferred data message, if send window not full: */
1575 buf
= l_ptr
->next_out
;
1577 struct tipc_msg
*msg
= buf_msg(buf
);
1578 u32 next
= msg_seqno(msg
);
1579 u32 first
= msg_seqno(buf_msg(l_ptr
->first_out
));
1581 if (mod(next
- first
) < l_ptr
->queue_limit
[0]) {
1582 msg_set_ack(msg
, mod(l_ptr
->next_in_no
- 1));
1583 msg_set_bcast_ack(msg
, l_ptr
->owner
->bclink
.last_in
);
1584 if (tipc_bearer_send(l_ptr
->b_ptr
, buf
, &l_ptr
->media_addr
)) {
1585 if (msg_user(msg
) == MSG_BUNDLER
)
1586 msg_set_type(msg
, CLOSED_MSG
);
1587 msg_dbg(msg
, ">PUSH-DATA>");
1588 l_ptr
->next_out
= buf
->next
;
1591 msg_dbg(msg
, "|PUSH-DATA|");
1592 l_ptr
->stats
.bearer_congs
++;
1597 return PUSH_FINISHED
;
1601 * push_queue(): push out the unsent messages of a link where
1602 * congestion has abated. Node is locked
1604 void tipc_link_push_queue(struct link
*l_ptr
)
1608 if (tipc_bearer_congested(l_ptr
->b_ptr
, l_ptr
))
1612 res
= tipc_link_push_packet(l_ptr
);
1614 while (res
== TIPC_OK
);
1615 if (res
== PUSH_FAILED
)
1616 tipc_bearer_schedule(l_ptr
->b_ptr
, l_ptr
);
1619 static void link_reset_all(unsigned long addr
)
1622 char addr_string
[16];
1625 read_lock_bh(&tipc_net_lock
);
1626 n_ptr
= tipc_node_find((u32
)addr
);
1628 read_unlock_bh(&tipc_net_lock
);
1629 return; /* node no longer exists */
1632 tipc_node_lock(n_ptr
);
1634 warn("Resetting all links to %s\n",
1635 addr_string_fill(addr_string
, n_ptr
->addr
));
1637 for (i
= 0; i
< MAX_BEARERS
; i
++) {
1638 if (n_ptr
->links
[i
]) {
1639 link_print(n_ptr
->links
[i
], TIPC_OUTPUT
,
1640 "Resetting link\n");
1641 tipc_link_reset(n_ptr
->links
[i
]);
1645 tipc_node_unlock(n_ptr
);
1646 read_unlock_bh(&tipc_net_lock
);
1649 static void link_retransmit_failure(struct link
*l_ptr
, struct sk_buff
*buf
)
1651 struct tipc_msg
*msg
= buf_msg(buf
);
1653 warn("Retransmission failure on link <%s>\n", l_ptr
->name
);
1654 tipc_msg_print(TIPC_OUTPUT
, msg
, ">RETR-FAIL>");
1658 /* Handle failure on standard link */
1660 link_print(l_ptr
, TIPC_OUTPUT
, "Resetting link\n");
1661 tipc_link_reset(l_ptr
);
1665 /* Handle failure on broadcast link */
1668 char addr_string
[16];
1670 tipc_printf(TIPC_OUTPUT
, "Msg seq number: %u, ", msg_seqno(msg
));
1671 tipc_printf(TIPC_OUTPUT
, "Outstanding acks: %lu\n",
1672 (unsigned long) TIPC_SKB_CB(buf
)->handle
);
1674 n_ptr
= l_ptr
->owner
->next
;
1675 tipc_node_lock(n_ptr
);
1677 addr_string_fill(addr_string
, n_ptr
->addr
);
1678 tipc_printf(TIPC_OUTPUT
, "Multicast link info for %s\n", addr_string
);
1679 tipc_printf(TIPC_OUTPUT
, "Supported: %d, ", n_ptr
->bclink
.supported
);
1680 tipc_printf(TIPC_OUTPUT
, "Acked: %u\n", n_ptr
->bclink
.acked
);
1681 tipc_printf(TIPC_OUTPUT
, "Last in: %u, ", n_ptr
->bclink
.last_in
);
1682 tipc_printf(TIPC_OUTPUT
, "Gap after: %u, ", n_ptr
->bclink
.gap_after
);
1683 tipc_printf(TIPC_OUTPUT
, "Gap to: %u\n", n_ptr
->bclink
.gap_to
);
1684 tipc_printf(TIPC_OUTPUT
, "Nack sync: %u\n\n", n_ptr
->bclink
.nack_sync
);
1686 tipc_k_signal((Handler
)link_reset_all
, (unsigned long)n_ptr
->addr
);
1688 tipc_node_unlock(n_ptr
);
1690 l_ptr
->stale_count
= 0;
1694 void tipc_link_retransmit(struct link
*l_ptr
, struct sk_buff
*buf
,
1697 struct tipc_msg
*msg
;
1704 dbg("Retransmitting %u in link %x\n", retransmits
, l_ptr
);
1706 if (tipc_bearer_congested(l_ptr
->b_ptr
, l_ptr
)) {
1707 if (!skb_cloned(buf
)) {
1708 msg_dbg(msg
, ">NO_RETR->BCONG>");
1709 dbg_print_link(l_ptr
, " ");
1710 l_ptr
->retransm_queue_head
= msg_seqno(msg
);
1711 l_ptr
->retransm_queue_size
= retransmits
;
1714 /* Don't retransmit if driver already has the buffer */
1717 /* Detect repeated retransmit failures on uncongested bearer */
1719 if (l_ptr
->last_retransmitted
== msg_seqno(msg
)) {
1720 if (++l_ptr
->stale_count
> 100) {
1721 link_retransmit_failure(l_ptr
, buf
);
1725 l_ptr
->last_retransmitted
= msg_seqno(msg
);
1726 l_ptr
->stale_count
= 1;
1730 while (retransmits
&& (buf
!= l_ptr
->next_out
) && buf
&& !skb_cloned(buf
)) {
1732 msg_set_ack(msg
, mod(l_ptr
->next_in_no
- 1));
1733 msg_set_bcast_ack(msg
, l_ptr
->owner
->bclink
.last_in
);
1734 if (tipc_bearer_send(l_ptr
->b_ptr
, buf
, &l_ptr
->media_addr
)) {
1735 msg_dbg(buf_msg(buf
), ">RETR>");
1738 l_ptr
->stats
.retransmitted
++;
1740 tipc_bearer_schedule(l_ptr
->b_ptr
, l_ptr
);
1741 l_ptr
->stats
.bearer_congs
++;
1742 l_ptr
->retransm_queue_head
= msg_seqno(buf_msg(buf
));
1743 l_ptr
->retransm_queue_size
= retransmits
;
1748 l_ptr
->retransm_queue_head
= l_ptr
->retransm_queue_size
= 0;
1752 * link_recv_non_seq: Receive packets which are outside
1753 * the link sequence flow
1756 static void link_recv_non_seq(struct sk_buff
*buf
)
1758 struct tipc_msg
*msg
= buf_msg(buf
);
1760 if (msg_user(msg
) == LINK_CONFIG
)
1761 tipc_disc_recv_msg(buf
);
1763 tipc_bclink_recv_pkt(buf
);
1767 * link_insert_deferred_queue - insert deferred messages back into receive chain
1770 static struct sk_buff
*link_insert_deferred_queue(struct link
*l_ptr
,
1771 struct sk_buff
*buf
)
1775 if (l_ptr
->oldest_deferred_in
== NULL
)
1778 seq_no
= msg_seqno(buf_msg(l_ptr
->oldest_deferred_in
));
1779 if (seq_no
== mod(l_ptr
->next_in_no
)) {
1780 l_ptr
->newest_deferred_in
->next
= buf
;
1781 buf
= l_ptr
->oldest_deferred_in
;
1782 l_ptr
->oldest_deferred_in
= NULL
;
1783 l_ptr
->deferred_inqueue_sz
= 0;
1788 void tipc_recv_msg(struct sk_buff
*head
, struct tipc_bearer
*tb_ptr
)
1790 read_lock_bh(&tipc_net_lock
);
1792 struct bearer
*b_ptr
;
1795 struct sk_buff
*crs
;
1796 struct sk_buff
*buf
= head
;
1797 struct tipc_msg
*msg
= buf_msg(buf
);
1798 u32 seq_no
= msg_seqno(msg
);
1799 u32 ackd
= msg_ack(msg
);
1803 b_ptr
= (struct bearer
*)tb_ptr
;
1804 TIPC_SKB_CB(buf
)->handle
= b_ptr
;
1807 if (unlikely(msg_version(msg
) != TIPC_VERSION
))
1810 if (msg_user(msg
) != LINK_PROTOCOL
)
1812 msg_dbg(msg
,"<REC<");
1814 /* Ensure message data is a single contiguous unit */
1816 if (unlikely(buf_linearize(buf
))) {
1820 if (unlikely(msg_non_seq(msg
))) {
1821 link_recv_non_seq(buf
);
1825 if (unlikely(!msg_short(msg
) &&
1826 (msg_destnode(msg
) != tipc_own_addr
)))
1829 n_ptr
= tipc_node_find(msg_prevnode(msg
));
1830 if (unlikely(!n_ptr
))
1833 tipc_node_lock(n_ptr
);
1834 l_ptr
= n_ptr
->links
[b_ptr
->identity
];
1835 if (unlikely(!l_ptr
)) {
1836 tipc_node_unlock(n_ptr
);
1840 * Release acked messages
1842 if (less(n_ptr
->bclink
.acked
, msg_bcast_ack(msg
))) {
1843 if (tipc_node_is_up(n_ptr
) && n_ptr
->bclink
.supported
)
1844 tipc_bclink_acknowledge(n_ptr
, msg_bcast_ack(msg
));
1847 crs
= l_ptr
->first_out
;
1848 while ((crs
!= l_ptr
->next_out
) &&
1849 less_eq(msg_seqno(buf_msg(crs
)), ackd
)) {
1850 struct sk_buff
*next
= crs
->next
;
1857 l_ptr
->first_out
= crs
;
1858 l_ptr
->out_queue_size
-= released
;
1860 if (unlikely(l_ptr
->next_out
))
1861 tipc_link_push_queue(l_ptr
);
1862 if (unlikely(!list_empty(&l_ptr
->waiting_ports
)))
1863 tipc_link_wakeup_ports(l_ptr
, 0);
1864 if (unlikely(++l_ptr
->unacked_window
>= TIPC_MIN_LINK_WIN
)) {
1865 l_ptr
->stats
.sent_acks
++;
1866 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
, 0, 0, 0, 0, 0);
1870 if (likely(link_working_working(l_ptr
))) {
1871 if (likely(seq_no
== mod(l_ptr
->next_in_no
))) {
1872 l_ptr
->next_in_no
++;
1873 if (unlikely(l_ptr
->oldest_deferred_in
))
1874 head
= link_insert_deferred_queue(l_ptr
,
1876 if (likely(msg_is_dest(msg
, tipc_own_addr
))) {
1878 if (likely(msg_isdata(msg
))) {
1879 tipc_node_unlock(n_ptr
);
1880 tipc_port_recv_msg(buf
);
1883 switch (msg_user(msg
)) {
1885 l_ptr
->stats
.recv_bundles
++;
1886 l_ptr
->stats
.recv_bundled
+=
1888 tipc_node_unlock(n_ptr
);
1889 tipc_link_recv_bundle(buf
);
1891 case ROUTE_DISTRIBUTOR
:
1892 tipc_node_unlock(n_ptr
);
1893 tipc_cltr_recv_routing_table(buf
);
1895 case NAME_DISTRIBUTOR
:
1896 tipc_node_unlock(n_ptr
);
1897 tipc_named_recv(buf
);
1900 tipc_node_unlock(n_ptr
);
1901 tipc_port_recv_proto_msg(buf
);
1903 case MSG_FRAGMENTER
:
1904 l_ptr
->stats
.recv_fragments
++;
1905 if (tipc_link_recv_fragment(&l_ptr
->defragm_buf
,
1907 l_ptr
->stats
.recv_fragmented
++;
1911 case CHANGEOVER_PROTOCOL
:
1912 type
= msg_type(msg
);
1913 if (link_recv_changeover_msg(&l_ptr
, &buf
)) {
1915 seq_no
= msg_seqno(msg
);
1916 TIPC_SKB_CB(buf
)->handle
1918 if (type
== ORIGINAL_MSG
)
1920 goto protocol_check
;
1925 tipc_node_unlock(n_ptr
);
1926 tipc_net_route_msg(buf
);
1929 link_handle_out_of_seq_msg(l_ptr
, buf
);
1930 head
= link_insert_deferred_queue(l_ptr
, head
);
1931 tipc_node_unlock(n_ptr
);
1935 if (msg_user(msg
) == LINK_PROTOCOL
) {
1936 link_recv_proto_msg(l_ptr
, buf
);
1937 head
= link_insert_deferred_queue(l_ptr
, head
);
1938 tipc_node_unlock(n_ptr
);
1941 msg_dbg(msg
,"NSEQ<REC<");
1942 link_state_event(l_ptr
, TRAFFIC_MSG_EVT
);
1944 if (link_working_working(l_ptr
)) {
1945 /* Re-insert in front of queue */
1946 msg_dbg(msg
,"RECV-REINS:");
1949 tipc_node_unlock(n_ptr
);
1952 tipc_node_unlock(n_ptr
);
1956 read_unlock_bh(&tipc_net_lock
);
1960 * link_defer_buf(): Sort a received out-of-sequence packet
1961 * into the deferred reception queue.
1962 * Returns the increase of the queue length,i.e. 0 or 1
1965 u32
tipc_link_defer_pkt(struct sk_buff
**head
,
1966 struct sk_buff
**tail
,
1967 struct sk_buff
*buf
)
1969 struct sk_buff
*prev
= NULL
;
1970 struct sk_buff
*crs
= *head
;
1971 u32 seq_no
= msg_seqno(buf_msg(buf
));
1976 if (*head
== NULL
) {
1977 *head
= *tail
= buf
;
1982 if (less(msg_seqno(buf_msg(*tail
)), seq_no
)) {
1983 (*tail
)->next
= buf
;
1988 /* Scan through queue and sort it in */
1990 struct tipc_msg
*msg
= buf_msg(crs
);
1992 if (less(seq_no
, msg_seqno(msg
))) {
2000 if (seq_no
== msg_seqno(msg
)) {
2008 /* Message is a duplicate of an existing message */
2015 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
2018 static void link_handle_out_of_seq_msg(struct link
*l_ptr
,
2019 struct sk_buff
*buf
)
2021 u32 seq_no
= msg_seqno(buf_msg(buf
));
2023 if (likely(msg_user(buf_msg(buf
)) == LINK_PROTOCOL
)) {
2024 link_recv_proto_msg(l_ptr
, buf
);
2028 dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
2029 seq_no
, mod(l_ptr
->next_in_no
), l_ptr
->next_in_no
);
2031 /* Record OOS packet arrival (force mismatch on next timeout) */
2033 l_ptr
->checkpoint
--;
2036 * Discard packet if a duplicate; otherwise add it to deferred queue
2037 * and notify peer of gap as per protocol specification
2040 if (less(seq_no
, mod(l_ptr
->next_in_no
))) {
2041 l_ptr
->stats
.duplicates
++;
2046 if (tipc_link_defer_pkt(&l_ptr
->oldest_deferred_in
,
2047 &l_ptr
->newest_deferred_in
, buf
)) {
2048 l_ptr
->deferred_inqueue_sz
++;
2049 l_ptr
->stats
.deferred_recv
++;
2050 if ((l_ptr
->deferred_inqueue_sz
% 16) == 1)
2051 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
, 0, 0, 0, 0, 0);
2053 l_ptr
->stats
.duplicates
++;
2057 * Send protocol message to the other endpoint.
2059 void tipc_link_send_proto_msg(struct link
*l_ptr
, u32 msg_typ
, int probe_msg
,
2060 u32 gap
, u32 tolerance
, u32 priority
, u32 ack_mtu
)
2062 struct sk_buff
*buf
= NULL
;
2063 struct tipc_msg
*msg
= l_ptr
->pmsg
;
2064 u32 msg_size
= sizeof(l_ptr
->proto_msg
);
2066 if (link_blocked(l_ptr
))
2068 msg_set_type(msg
, msg_typ
);
2069 msg_set_net_plane(msg
, l_ptr
->b_ptr
->net_plane
);
2070 msg_set_bcast_ack(msg
, mod(l_ptr
->owner
->bclink
.last_in
));
2071 msg_set_last_bcast(msg
, tipc_bclink_get_last_sent());
2073 if (msg_typ
== STATE_MSG
) {
2074 u32 next_sent
= mod(l_ptr
->next_out_no
);
2076 if (!tipc_link_is_up(l_ptr
))
2078 if (l_ptr
->next_out
)
2079 next_sent
= msg_seqno(buf_msg(l_ptr
->next_out
));
2080 msg_set_next_sent(msg
, next_sent
);
2081 if (l_ptr
->oldest_deferred_in
) {
2082 u32 rec
= msg_seqno(buf_msg(l_ptr
->oldest_deferred_in
));
2083 gap
= mod(rec
- mod(l_ptr
->next_in_no
));
2085 msg_set_seq_gap(msg
, gap
);
2087 l_ptr
->stats
.sent_nacks
++;
2088 msg_set_link_tolerance(msg
, tolerance
);
2089 msg_set_linkprio(msg
, priority
);
2090 msg_set_max_pkt(msg
, ack_mtu
);
2091 msg_set_ack(msg
, mod(l_ptr
->next_in_no
- 1));
2092 msg_set_probe(msg
, probe_msg
!= 0);
2094 u32 mtu
= l_ptr
->max_pkt
;
2096 if ((mtu
< l_ptr
->max_pkt_target
) &&
2097 link_working_working(l_ptr
) &&
2098 l_ptr
->fsm_msg_cnt
) {
2099 msg_size
= (mtu
+ (l_ptr
->max_pkt_target
- mtu
)/2 + 2) & ~3;
2100 if (l_ptr
->max_pkt_probes
== 10) {
2101 l_ptr
->max_pkt_target
= (msg_size
- 4);
2102 l_ptr
->max_pkt_probes
= 0;
2103 msg_size
= (mtu
+ (l_ptr
->max_pkt_target
- mtu
)/2 + 2) & ~3;
2105 l_ptr
->max_pkt_probes
++;
2108 l_ptr
->stats
.sent_probes
++;
2110 l_ptr
->stats
.sent_states
++;
2111 } else { /* RESET_MSG or ACTIVATE_MSG */
2112 msg_set_ack(msg
, mod(l_ptr
->reset_checkpoint
- 1));
2113 msg_set_seq_gap(msg
, 0);
2114 msg_set_next_sent(msg
, 1);
2115 msg_set_link_tolerance(msg
, l_ptr
->tolerance
);
2116 msg_set_linkprio(msg
, l_ptr
->priority
);
2117 msg_set_max_pkt(msg
, l_ptr
->max_pkt_target
);
2120 if (tipc_node_has_redundant_links(l_ptr
->owner
)) {
2121 msg_set_redundant_link(msg
);
2123 msg_clear_redundant_link(msg
);
2125 msg_set_linkprio(msg
, l_ptr
->priority
);
2127 /* Ensure sequence number will not fit : */
2129 msg_set_seqno(msg
, mod(l_ptr
->next_out_no
+ (0xffff/2)));
2133 if (tipc_bearer_congested(l_ptr
->b_ptr
, l_ptr
)) {
2134 if (!l_ptr
->proto_msg_queue
) {
2135 l_ptr
->proto_msg_queue
=
2136 buf_acquire(sizeof(l_ptr
->proto_msg
));
2138 buf
= l_ptr
->proto_msg_queue
;
2141 skb_copy_to_linear_data(buf
, msg
, sizeof(l_ptr
->proto_msg
));
2144 msg_set_timestamp(msg
, jiffies_to_msecs(jiffies
));
2146 /* Message can be sent */
2150 buf
= buf_acquire(msg_size
);
2154 skb_copy_to_linear_data(buf
, msg
, sizeof(l_ptr
->proto_msg
));
2155 msg_set_size(buf_msg(buf
), msg_size
);
2157 if (tipc_bearer_send(l_ptr
->b_ptr
, buf
, &l_ptr
->media_addr
)) {
2158 l_ptr
->unacked_window
= 0;
2163 /* New congestion */
2164 tipc_bearer_schedule(l_ptr
->b_ptr
, l_ptr
);
2165 l_ptr
->proto_msg_queue
= buf
;
2166 l_ptr
->stats
.bearer_congs
++;
2170 * Receive protocol message :
2171 * Note that network plane id propagates through the network, and may
2172 * change at any time. The node with lowest address rules
2175 static void link_recv_proto_msg(struct link
*l_ptr
, struct sk_buff
*buf
)
2181 struct tipc_msg
*msg
= buf_msg(buf
);
2183 dbg("AT(%u):", jiffies_to_msecs(jiffies
));
2185 if (link_blocked(l_ptr
))
2188 /* record unnumbered packet arrival (force mismatch on next timeout) */
2190 l_ptr
->checkpoint
--;
2192 if (l_ptr
->b_ptr
->net_plane
!= msg_net_plane(msg
))
2193 if (tipc_own_addr
> msg_prevnode(msg
))
2194 l_ptr
->b_ptr
->net_plane
= msg_net_plane(msg
);
2196 l_ptr
->owner
->permit_changeover
= msg_redundant_link(msg
);
2198 switch (msg_type(msg
)) {
2201 if (!link_working_unknown(l_ptr
) && l_ptr
->peer_session
) {
2202 if (msg_session(msg
) == l_ptr
->peer_session
) {
2203 dbg("Duplicate RESET: %u<->%u\n",
2204 msg_session(msg
), l_ptr
->peer_session
);
2205 break; /* duplicate: ignore */
2210 /* Update link settings according other endpoint's values */
2212 strcpy((strrchr(l_ptr
->name
, ':') + 1), (char *)msg_data(msg
));
2214 if ((msg_tol
= msg_link_tolerance(msg
)) &&
2215 (msg_tol
> l_ptr
->tolerance
))
2216 link_set_supervision_props(l_ptr
, msg_tol
);
2218 if (msg_linkprio(msg
) > l_ptr
->priority
)
2219 l_ptr
->priority
= msg_linkprio(msg
);
2221 max_pkt_info
= msg_max_pkt(msg
);
2223 if (max_pkt_info
< l_ptr
->max_pkt_target
)
2224 l_ptr
->max_pkt_target
= max_pkt_info
;
2225 if (l_ptr
->max_pkt
> l_ptr
->max_pkt_target
)
2226 l_ptr
->max_pkt
= l_ptr
->max_pkt_target
;
2228 l_ptr
->max_pkt
= l_ptr
->max_pkt_target
;
2230 l_ptr
->owner
->bclink
.supported
= (max_pkt_info
!= 0);
2232 link_state_event(l_ptr
, msg_type(msg
));
2234 l_ptr
->peer_session
= msg_session(msg
);
2235 l_ptr
->peer_bearer_id
= msg_bearer_id(msg
);
2237 /* Synchronize broadcast sequence numbers */
2238 if (!tipc_node_has_redundant_links(l_ptr
->owner
)) {
2239 l_ptr
->owner
->bclink
.last_in
= mod(msg_last_bcast(msg
));
2244 if ((msg_tol
= msg_link_tolerance(msg
)))
2245 link_set_supervision_props(l_ptr
, msg_tol
);
2247 if (msg_linkprio(msg
) &&
2248 (msg_linkprio(msg
) != l_ptr
->priority
)) {
2249 warn("Resetting link <%s>, priority change %u->%u\n",
2250 l_ptr
->name
, l_ptr
->priority
, msg_linkprio(msg
));
2251 l_ptr
->priority
= msg_linkprio(msg
);
2252 tipc_link_reset(l_ptr
); /* Enforce change to take effect */
2255 link_state_event(l_ptr
, TRAFFIC_MSG_EVT
);
2256 l_ptr
->stats
.recv_states
++;
2257 if (link_reset_unknown(l_ptr
))
2260 if (less_eq(mod(l_ptr
->next_in_no
), msg_next_sent(msg
))) {
2261 rec_gap
= mod(msg_next_sent(msg
) -
2262 mod(l_ptr
->next_in_no
));
2265 max_pkt_ack
= msg_max_pkt(msg
);
2266 if (max_pkt_ack
> l_ptr
->max_pkt
) {
2267 dbg("Link <%s> updated MTU %u -> %u\n",
2268 l_ptr
->name
, l_ptr
->max_pkt
, max_pkt_ack
);
2269 l_ptr
->max_pkt
= max_pkt_ack
;
2270 l_ptr
->max_pkt_probes
= 0;
2274 if (msg_probe(msg
)) {
2275 l_ptr
->stats
.recv_probes
++;
2276 if (msg_size(msg
) > sizeof(l_ptr
->proto_msg
)) {
2277 max_pkt_ack
= msg_size(msg
);
2281 /* Protocol message before retransmits, reduce loss risk */
2283 tipc_bclink_check_gap(l_ptr
->owner
, msg_last_bcast(msg
));
2285 if (rec_gap
|| (msg_probe(msg
))) {
2286 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
,
2287 0, rec_gap
, 0, 0, max_pkt_ack
);
2289 if (msg_seq_gap(msg
)) {
2290 msg_dbg(msg
, "With Gap:");
2291 l_ptr
->stats
.recv_nacks
++;
2292 tipc_link_retransmit(l_ptr
, l_ptr
->first_out
,
2297 msg_dbg(buf_msg(buf
), "<DISCARDING UNKNOWN<");
2305 * tipc_link_tunnel(): Send one message via a link belonging to
2306 * another bearer. Owner node is locked.
2308 void tipc_link_tunnel(struct link
*l_ptr
,
2309 struct tipc_msg
*tunnel_hdr
,
2310 struct tipc_msg
*msg
,
2313 struct link
*tunnel
;
2314 struct sk_buff
*buf
;
2315 u32 length
= msg_size(msg
);
2317 tunnel
= l_ptr
->owner
->active_links
[selector
& 1];
2318 if (!tipc_link_is_up(tunnel
)) {
2319 warn("Link changeover error, "
2320 "tunnel link no longer available\n");
2323 msg_set_size(tunnel_hdr
, length
+ INT_H_SIZE
);
2324 buf
= buf_acquire(length
+ INT_H_SIZE
);
2326 warn("Link changeover error, "
2327 "unable to send tunnel msg\n");
2330 skb_copy_to_linear_data(buf
, tunnel_hdr
, INT_H_SIZE
);
2331 skb_copy_to_linear_data_offset(buf
, INT_H_SIZE
, msg
, length
);
2332 dbg("%c->%c:", l_ptr
->b_ptr
->net_plane
, tunnel
->b_ptr
->net_plane
);
2333 msg_dbg(buf_msg(buf
), ">SEND>");
2334 tipc_link_send_buf(tunnel
, buf
);
2340 * changeover(): Send whole message queue via the remaining link
2341 * Owner node is locked.
2344 void tipc_link_changeover(struct link
*l_ptr
)
2346 u32 msgcount
= l_ptr
->out_queue_size
;
2347 struct sk_buff
*crs
= l_ptr
->first_out
;
2348 struct link
*tunnel
= l_ptr
->owner
->active_links
[0];
2349 struct tipc_msg tunnel_hdr
;
2355 if (!l_ptr
->owner
->permit_changeover
) {
2356 warn("Link changeover error, "
2357 "peer did not permit changeover\n");
2361 msg_init(&tunnel_hdr
, CHANGEOVER_PROTOCOL
,
2362 ORIGINAL_MSG
, TIPC_OK
, INT_H_SIZE
, l_ptr
->addr
);
2363 msg_set_bearer_id(&tunnel_hdr
, l_ptr
->peer_bearer_id
);
2364 msg_set_msgcnt(&tunnel_hdr
, msgcount
);
2365 dbg("Link changeover requires %u tunnel messages\n", msgcount
);
2367 if (!l_ptr
->first_out
) {
2368 struct sk_buff
*buf
;
2370 buf
= buf_acquire(INT_H_SIZE
);
2372 skb_copy_to_linear_data(buf
, &tunnel_hdr
, INT_H_SIZE
);
2373 msg_set_size(&tunnel_hdr
, INT_H_SIZE
);
2374 dbg("%c->%c:", l_ptr
->b_ptr
->net_plane
,
2375 tunnel
->b_ptr
->net_plane
);
2376 msg_dbg(&tunnel_hdr
, "EMPTY>SEND>");
2377 tipc_link_send_buf(tunnel
, buf
);
2379 warn("Link changeover error, "
2380 "unable to send changeover msg\n");
2385 split_bundles
= (l_ptr
->owner
->active_links
[0] !=
2386 l_ptr
->owner
->active_links
[1]);
2389 struct tipc_msg
*msg
= buf_msg(crs
);
2391 if ((msg_user(msg
) == MSG_BUNDLER
) && split_bundles
) {
2392 struct tipc_msg
*m
= msg_get_wrapped(msg
);
2393 unchar
* pos
= (unchar
*)m
;
2395 msgcount
= msg_msgcnt(msg
);
2396 while (msgcount
--) {
2397 msg_set_seqno(m
,msg_seqno(msg
));
2398 tipc_link_tunnel(l_ptr
, &tunnel_hdr
, m
,
2399 msg_link_selector(m
));
2400 pos
+= align(msg_size(m
));
2401 m
= (struct tipc_msg
*)pos
;
2404 tipc_link_tunnel(l_ptr
, &tunnel_hdr
, msg
,
2405 msg_link_selector(msg
));
2411 void tipc_link_send_duplicate(struct link
*l_ptr
, struct link
*tunnel
)
2413 struct sk_buff
*iter
;
2414 struct tipc_msg tunnel_hdr
;
2416 msg_init(&tunnel_hdr
, CHANGEOVER_PROTOCOL
,
2417 DUPLICATE_MSG
, TIPC_OK
, INT_H_SIZE
, l_ptr
->addr
);
2418 msg_set_msgcnt(&tunnel_hdr
, l_ptr
->out_queue_size
);
2419 msg_set_bearer_id(&tunnel_hdr
, l_ptr
->peer_bearer_id
);
2420 iter
= l_ptr
->first_out
;
2422 struct sk_buff
*outbuf
;
2423 struct tipc_msg
*msg
= buf_msg(iter
);
2424 u32 length
= msg_size(msg
);
2426 if (msg_user(msg
) == MSG_BUNDLER
)
2427 msg_set_type(msg
, CLOSED_MSG
);
2428 msg_set_ack(msg
, mod(l_ptr
->next_in_no
- 1)); /* Update */
2429 msg_set_bcast_ack(msg
, l_ptr
->owner
->bclink
.last_in
);
2430 msg_set_size(&tunnel_hdr
, length
+ INT_H_SIZE
);
2431 outbuf
= buf_acquire(length
+ INT_H_SIZE
);
2432 if (outbuf
== NULL
) {
2433 warn("Link changeover error, "
2434 "unable to send duplicate msg\n");
2437 skb_copy_to_linear_data(outbuf
, &tunnel_hdr
, INT_H_SIZE
);
2438 skb_copy_to_linear_data_offset(outbuf
, INT_H_SIZE
, iter
->data
,
2440 dbg("%c->%c:", l_ptr
->b_ptr
->net_plane
,
2441 tunnel
->b_ptr
->net_plane
);
2442 msg_dbg(buf_msg(outbuf
), ">SEND>");
2443 tipc_link_send_buf(tunnel
, outbuf
);
2444 if (!tipc_link_is_up(l_ptr
))
2453 * buf_extract - extracts embedded TIPC message from another message
2454 * @skb: encapsulating message buffer
2455 * @from_pos: offset to extract from
2457 * Returns a new message buffer containing an embedded message. The
2458 * encapsulating message itself is left unchanged.
2461 static struct sk_buff
*buf_extract(struct sk_buff
*skb
, u32 from_pos
)
2463 struct tipc_msg
*msg
= (struct tipc_msg
*)(skb
->data
+ from_pos
);
2464 u32 size
= msg_size(msg
);
2467 eb
= buf_acquire(size
);
2469 skb_copy_to_linear_data(eb
, msg
, size
);
2474 * link_recv_changeover_msg(): Receive tunneled packet sent
2475 * via other link. Node is locked. Return extracted buffer.
2478 static int link_recv_changeover_msg(struct link
**l_ptr
,
2479 struct sk_buff
**buf
)
2481 struct sk_buff
*tunnel_buf
= *buf
;
2482 struct link
*dest_link
;
2483 struct tipc_msg
*msg
;
2484 struct tipc_msg
*tunnel_msg
= buf_msg(tunnel_buf
);
2485 u32 msg_typ
= msg_type(tunnel_msg
);
2486 u32 msg_count
= msg_msgcnt(tunnel_msg
);
2488 dest_link
= (*l_ptr
)->owner
->links
[msg_bearer_id(tunnel_msg
)];
2490 msg_dbg(tunnel_msg
, "NOLINK/<REC<");
2493 if (dest_link
== *l_ptr
) {
2494 err("Unexpected changeover message on link <%s>\n",
2498 dbg("%c<-%c:", dest_link
->b_ptr
->net_plane
,
2499 (*l_ptr
)->b_ptr
->net_plane
);
2501 msg
= msg_get_wrapped(tunnel_msg
);
2503 if (msg_typ
== DUPLICATE_MSG
) {
2504 if (less(msg_seqno(msg
), mod(dest_link
->next_in_no
))) {
2505 msg_dbg(tunnel_msg
, "DROP/<REC<");
2508 *buf
= buf_extract(tunnel_buf
,INT_H_SIZE
);
2510 warn("Link changeover error, duplicate msg dropped\n");
2513 msg_dbg(tunnel_msg
, "TNL<REC<");
2514 buf_discard(tunnel_buf
);
2518 /* First original message ?: */
2520 if (tipc_link_is_up(dest_link
)) {
2521 msg_dbg(tunnel_msg
, "UP/FIRST/<REC<");
2522 info("Resetting link <%s>, changeover initiated by peer\n",
2524 tipc_link_reset(dest_link
);
2525 dest_link
->exp_msg_count
= msg_count
;
2526 dbg("Expecting %u tunnelled messages\n", msg_count
);
2529 } else if (dest_link
->exp_msg_count
== START_CHANGEOVER
) {
2530 msg_dbg(tunnel_msg
, "BLK/FIRST/<REC<");
2531 dest_link
->exp_msg_count
= msg_count
;
2532 dbg("Expecting %u tunnelled messages\n", msg_count
);
2537 /* Receive original message */
2539 if (dest_link
->exp_msg_count
== 0) {
2540 warn("Link switchover error, "
2541 "got too many tunnelled messages\n");
2542 msg_dbg(tunnel_msg
, "OVERDUE/DROP/<REC<");
2543 dbg_print_link(dest_link
, "LINK:");
2546 dest_link
->exp_msg_count
--;
2547 if (less(msg_seqno(msg
), dest_link
->reset_checkpoint
)) {
2548 msg_dbg(tunnel_msg
, "DROP/DUPL/<REC<");
2551 *buf
= buf_extract(tunnel_buf
, INT_H_SIZE
);
2553 msg_dbg(tunnel_msg
, "TNL<REC<");
2554 buf_discard(tunnel_buf
);
2557 warn("Link changeover error, original msg dropped\n");
2562 buf_discard(tunnel_buf
);
2567 * Bundler functionality:
2569 void tipc_link_recv_bundle(struct sk_buff
*buf
)
2571 u32 msgcount
= msg_msgcnt(buf_msg(buf
));
2572 u32 pos
= INT_H_SIZE
;
2573 struct sk_buff
*obuf
;
2575 msg_dbg(buf_msg(buf
), "<BNDL<: ");
2576 while (msgcount
--) {
2577 obuf
= buf_extract(buf
, pos
);
2579 warn("Link unable to unbundle message(s)\n");
2582 pos
+= align(msg_size(buf_msg(obuf
)));
2583 msg_dbg(buf_msg(obuf
), " /");
2584 tipc_net_route_msg(obuf
);
2590 * Fragmentation/defragmentation:
2595 * tipc_link_send_long_buf: Entry for buffers needing fragmentation.
2596 * The buffer is complete, inclusive total message length.
2597 * Returns user data length.
2599 int tipc_link_send_long_buf(struct link
*l_ptr
, struct sk_buff
*buf
)
2601 struct tipc_msg
*inmsg
= buf_msg(buf
);
2602 struct tipc_msg fragm_hdr
;
2603 u32 insize
= msg_size(inmsg
);
2604 u32 dsz
= msg_data_sz(inmsg
);
2605 unchar
*crs
= buf
->data
;
2607 u32 pack_sz
= link_max_pkt(l_ptr
);
2608 u32 fragm_sz
= pack_sz
- INT_H_SIZE
;
2610 u32 destaddr
= msg_destnode(inmsg
);
2612 if (msg_short(inmsg
))
2613 destaddr
= l_ptr
->addr
;
2615 if (msg_routed(inmsg
))
2616 msg_set_prevnode(inmsg
, tipc_own_addr
);
2618 /* Prepare reusable fragment header: */
2620 msg_init(&fragm_hdr
, MSG_FRAGMENTER
, FIRST_FRAGMENT
,
2621 TIPC_OK
, INT_H_SIZE
, destaddr
);
2622 msg_set_link_selector(&fragm_hdr
, msg_link_selector(inmsg
));
2623 msg_set_long_msgno(&fragm_hdr
, mod(l_ptr
->long_msg_seq_no
++));
2624 msg_set_fragm_no(&fragm_hdr
, fragm_no
);
2625 l_ptr
->stats
.sent_fragmented
++;
2627 /* Chop up message: */
2630 struct sk_buff
*fragm
;
2632 if (rest
<= fragm_sz
) {
2634 msg_set_type(&fragm_hdr
, LAST_FRAGMENT
);
2636 fragm
= buf_acquire(fragm_sz
+ INT_H_SIZE
);
2637 if (fragm
== NULL
) {
2638 warn("Link unable to fragment message\n");
2642 msg_set_size(&fragm_hdr
, fragm_sz
+ INT_H_SIZE
);
2643 skb_copy_to_linear_data(fragm
, &fragm_hdr
, INT_H_SIZE
);
2644 skb_copy_to_linear_data_offset(fragm
, INT_H_SIZE
, crs
,
2646 /* Send queued messages first, if any: */
2648 l_ptr
->stats
.sent_fragments
++;
2649 tipc_link_send_buf(l_ptr
, fragm
);
2650 if (!tipc_link_is_up(l_ptr
))
2652 msg_set_fragm_no(&fragm_hdr
, ++fragm_no
);
2655 msg_set_type(&fragm_hdr
, FRAGMENT
);
2663 * A pending message being re-assembled must store certain values
2664 * to handle subsequent fragments correctly. The following functions
2665 * help storing these values in unused, available fields in the
2666 * pending message. This makes dynamic memory allocation unecessary.
2669 static void set_long_msg_seqno(struct sk_buff
*buf
, u32 seqno
)
2671 msg_set_seqno(buf_msg(buf
), seqno
);
2674 static u32
get_fragm_size(struct sk_buff
*buf
)
2676 return msg_ack(buf_msg(buf
));
2679 static void set_fragm_size(struct sk_buff
*buf
, u32 sz
)
2681 msg_set_ack(buf_msg(buf
), sz
);
2684 static u32
get_expected_frags(struct sk_buff
*buf
)
2686 return msg_bcast_ack(buf_msg(buf
));
2689 static void set_expected_frags(struct sk_buff
*buf
, u32 exp
)
2691 msg_set_bcast_ack(buf_msg(buf
), exp
);
2694 static u32
get_timer_cnt(struct sk_buff
*buf
)
2696 return msg_reroute_cnt(buf_msg(buf
));
2699 static void incr_timer_cnt(struct sk_buff
*buf
)
2701 msg_incr_reroute_cnt(buf_msg(buf
));
2705 * tipc_link_recv_fragment(): Called with node lock on. Returns
2706 * the reassembled buffer if message is complete.
2708 int tipc_link_recv_fragment(struct sk_buff
**pending
, struct sk_buff
**fb
,
2709 struct tipc_msg
**m
)
2711 struct sk_buff
*prev
= NULL
;
2712 struct sk_buff
*fbuf
= *fb
;
2713 struct tipc_msg
*fragm
= buf_msg(fbuf
);
2714 struct sk_buff
*pbuf
= *pending
;
2715 u32 long_msg_seq_no
= msg_long_msgno(fragm
);
2718 msg_dbg(fragm
,"FRG<REC<");
2720 /* Is there an incomplete message waiting for this fragment? */
2722 while (pbuf
&& ((msg_seqno(buf_msg(pbuf
)) != long_msg_seq_no
)
2723 || (msg_orignode(fragm
) != msg_orignode(buf_msg(pbuf
))))) {
2728 if (!pbuf
&& (msg_type(fragm
) == FIRST_FRAGMENT
)) {
2729 struct tipc_msg
*imsg
= (struct tipc_msg
*)msg_data(fragm
);
2730 u32 msg_sz
= msg_size(imsg
);
2731 u32 fragm_sz
= msg_data_sz(fragm
);
2732 u32 exp_fragm_cnt
= msg_sz
/fragm_sz
+ !!(msg_sz
% fragm_sz
);
2733 u32 max
= TIPC_MAX_USER_MSG_SIZE
+ LONG_H_SIZE
;
2734 if (msg_type(imsg
) == TIPC_MCAST_MSG
)
2735 max
= TIPC_MAX_USER_MSG_SIZE
+ MCAST_H_SIZE
;
2736 if (msg_size(imsg
) > max
) {
2737 msg_dbg(fragm
,"<REC<Oversized: ");
2741 pbuf
= buf_acquire(msg_size(imsg
));
2743 pbuf
->next
= *pending
;
2745 skb_copy_to_linear_data(pbuf
, imsg
,
2746 msg_data_sz(fragm
));
2747 /* Prepare buffer for subsequent fragments. */
2749 set_long_msg_seqno(pbuf
, long_msg_seq_no
);
2750 set_fragm_size(pbuf
,fragm_sz
);
2751 set_expected_frags(pbuf
,exp_fragm_cnt
- 1);
2753 warn("Link unable to reassemble fragmented message\n");
2757 } else if (pbuf
&& (msg_type(fragm
) != FIRST_FRAGMENT
)) {
2758 u32 dsz
= msg_data_sz(fragm
);
2759 u32 fsz
= get_fragm_size(pbuf
);
2760 u32 crs
= ((msg_fragm_no(fragm
) - 1) * fsz
);
2761 u32 exp_frags
= get_expected_frags(pbuf
) - 1;
2762 skb_copy_to_linear_data_offset(pbuf
, crs
,
2763 msg_data(fragm
), dsz
);
2766 /* Is message complete? */
2768 if (exp_frags
== 0) {
2770 prev
->next
= pbuf
->next
;
2772 *pending
= pbuf
->next
;
2773 msg_reset_reroute_cnt(buf_msg(pbuf
));
2778 set_expected_frags(pbuf
,exp_frags
);
2781 dbg(" Discarding orphan fragment %x\n",fbuf
);
2782 msg_dbg(fragm
,"ORPHAN:");
2783 dbg("Pending long buffers:\n");
2784 dbg_print_buf_chain(*pending
);
2790 * link_check_defragm_bufs - flush stale incoming message fragments
2791 * @l_ptr: pointer to link
2794 static void link_check_defragm_bufs(struct link
*l_ptr
)
2796 struct sk_buff
*prev
= NULL
;
2797 struct sk_buff
*next
= NULL
;
2798 struct sk_buff
*buf
= l_ptr
->defragm_buf
;
2802 if (!link_working_working(l_ptr
))
2805 u32 cnt
= get_timer_cnt(buf
);
2809 incr_timer_cnt(buf
);
2812 dbg(" Discarding incomplete long buffer\n");
2813 msg_dbg(buf_msg(buf
), "LONG:");
2814 dbg_print_link(l_ptr
, "curr:");
2815 dbg("Pending long buffers:\n");
2816 dbg_print_buf_chain(l_ptr
->defragm_buf
);
2818 prev
->next
= buf
->next
;
2820 l_ptr
->defragm_buf
= buf
->next
;
2829 static void link_set_supervision_props(struct link
*l_ptr
, u32 tolerance
)
2831 l_ptr
->tolerance
= tolerance
;
2832 l_ptr
->continuity_interval
=
2833 ((tolerance
/ 4) > 500) ? 500 : tolerance
/ 4;
2834 l_ptr
->abort_limit
= tolerance
/ (l_ptr
->continuity_interval
/ 4);
2838 void tipc_link_set_queue_limits(struct link
*l_ptr
, u32 window
)
2840 /* Data messages from this node, inclusive FIRST_FRAGM */
2841 l_ptr
->queue_limit
[TIPC_LOW_IMPORTANCE
] = window
;
2842 l_ptr
->queue_limit
[TIPC_MEDIUM_IMPORTANCE
] = (window
/ 3) * 4;
2843 l_ptr
->queue_limit
[TIPC_HIGH_IMPORTANCE
] = (window
/ 3) * 5;
2844 l_ptr
->queue_limit
[TIPC_CRITICAL_IMPORTANCE
] = (window
/ 3) * 6;
2845 /* Transiting data messages,inclusive FIRST_FRAGM */
2846 l_ptr
->queue_limit
[TIPC_LOW_IMPORTANCE
+ 4] = 300;
2847 l_ptr
->queue_limit
[TIPC_MEDIUM_IMPORTANCE
+ 4] = 600;
2848 l_ptr
->queue_limit
[TIPC_HIGH_IMPORTANCE
+ 4] = 900;
2849 l_ptr
->queue_limit
[TIPC_CRITICAL_IMPORTANCE
+ 4] = 1200;
2850 l_ptr
->queue_limit
[CONN_MANAGER
] = 1200;
2851 l_ptr
->queue_limit
[ROUTE_DISTRIBUTOR
] = 1200;
2852 l_ptr
->queue_limit
[CHANGEOVER_PROTOCOL
] = 2500;
2853 l_ptr
->queue_limit
[NAME_DISTRIBUTOR
] = 3000;
2854 /* FRAGMENT and LAST_FRAGMENT packets */
2855 l_ptr
->queue_limit
[MSG_FRAGMENTER
] = 4000;
2859 * link_find_link - locate link by name
2860 * @name - ptr to link name string
2861 * @node - ptr to area to be filled with ptr to associated node
2863 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
2864 * this also prevents link deletion.
2866 * Returns pointer to link (or 0 if invalid link name).
2869 static struct link
*link_find_link(const char *name
, struct node
**node
)
2871 struct link_name link_name_parts
;
2872 struct bearer
*b_ptr
;
2875 if (!link_name_validate(name
, &link_name_parts
))
2878 b_ptr
= tipc_bearer_find_interface(link_name_parts
.if_local
);
2882 *node
= tipc_node_find(link_name_parts
.addr_peer
);
2886 l_ptr
= (*node
)->links
[b_ptr
->identity
];
2887 if (!l_ptr
|| strcmp(l_ptr
->name
, name
))
2893 struct sk_buff
*tipc_link_cmd_config(const void *req_tlv_area
, int req_tlv_space
,
2896 struct tipc_link_config
*args
;
2902 if (!TLV_CHECK(req_tlv_area
, req_tlv_space
, TIPC_TLV_LINK_CONFIG
))
2903 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR
);
2905 args
= (struct tipc_link_config
*)TLV_DATA(req_tlv_area
);
2906 new_value
= ntohl(args
->value
);
2908 if (!strcmp(args
->name
, tipc_bclink_name
)) {
2909 if ((cmd
== TIPC_CMD_SET_LINK_WINDOW
) &&
2910 (tipc_bclink_set_queue_limits(new_value
) == 0))
2911 return tipc_cfg_reply_none();
2912 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2913 " (cannot change setting on broadcast link)");
2916 read_lock_bh(&tipc_net_lock
);
2917 l_ptr
= link_find_link(args
->name
, &node
);
2919 read_unlock_bh(&tipc_net_lock
);
2920 return tipc_cfg_reply_error_string("link not found");
2923 tipc_node_lock(node
);
2926 case TIPC_CMD_SET_LINK_TOL
:
2927 if ((new_value
>= TIPC_MIN_LINK_TOL
) &&
2928 (new_value
<= TIPC_MAX_LINK_TOL
)) {
2929 link_set_supervision_props(l_ptr
, new_value
);
2930 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
,
2931 0, 0, new_value
, 0, 0);
2935 case TIPC_CMD_SET_LINK_PRI
:
2936 if ((new_value
>= TIPC_MIN_LINK_PRI
) &&
2937 (new_value
<= TIPC_MAX_LINK_PRI
)) {
2938 l_ptr
->priority
= new_value
;
2939 tipc_link_send_proto_msg(l_ptr
, STATE_MSG
,
2940 0, 0, 0, new_value
, 0);
2944 case TIPC_CMD_SET_LINK_WINDOW
:
2945 if ((new_value
>= TIPC_MIN_LINK_WIN
) &&
2946 (new_value
<= TIPC_MAX_LINK_WIN
)) {
2947 tipc_link_set_queue_limits(l_ptr
, new_value
);
2952 tipc_node_unlock(node
);
2954 read_unlock_bh(&tipc_net_lock
);
2956 return tipc_cfg_reply_error_string("cannot change link setting");
2958 return tipc_cfg_reply_none();
2962 * link_reset_statistics - reset link statistics
2963 * @l_ptr: pointer to link
2966 static void link_reset_statistics(struct link
*l_ptr
)
2968 memset(&l_ptr
->stats
, 0, sizeof(l_ptr
->stats
));
2969 l_ptr
->stats
.sent_info
= l_ptr
->next_out_no
;
2970 l_ptr
->stats
.recv_info
= l_ptr
->next_in_no
;
2973 struct sk_buff
*tipc_link_cmd_reset_stats(const void *req_tlv_area
, int req_tlv_space
)
2979 if (!TLV_CHECK(req_tlv_area
, req_tlv_space
, TIPC_TLV_LINK_NAME
))
2980 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR
);
2982 link_name
= (char *)TLV_DATA(req_tlv_area
);
2983 if (!strcmp(link_name
, tipc_bclink_name
)) {
2984 if (tipc_bclink_reset_stats())
2985 return tipc_cfg_reply_error_string("link not found");
2986 return tipc_cfg_reply_none();
2989 read_lock_bh(&tipc_net_lock
);
2990 l_ptr
= link_find_link(link_name
, &node
);
2992 read_unlock_bh(&tipc_net_lock
);
2993 return tipc_cfg_reply_error_string("link not found");
2996 tipc_node_lock(node
);
2997 link_reset_statistics(l_ptr
);
2998 tipc_node_unlock(node
);
2999 read_unlock_bh(&tipc_net_lock
);
3000 return tipc_cfg_reply_none();
3004 * percent - convert count to a percentage of total (rounding up or down)
3007 static u32
percent(u32 count
, u32 total
)
3009 return (count
* 100 + (total
/ 2)) / total
;
3013 * tipc_link_stats - print link statistics
3015 * @buf: print buffer area
3016 * @buf_size: size of print buffer area
3018 * Returns length of print buffer data string (or 0 if error)
3021 static int tipc_link_stats(const char *name
, char *buf
, const u32 buf_size
)
3023 struct print_buf pb
;
3027 u32 profile_total
= 0;
3029 if (!strcmp(name
, tipc_bclink_name
))
3030 return tipc_bclink_stats(buf
, buf_size
);
3032 tipc_printbuf_init(&pb
, buf
, buf_size
);
3034 read_lock_bh(&tipc_net_lock
);
3035 l_ptr
= link_find_link(name
, &node
);
3037 read_unlock_bh(&tipc_net_lock
);
3040 tipc_node_lock(node
);
3042 if (tipc_link_is_active(l_ptr
))
3044 else if (tipc_link_is_up(l_ptr
))
3048 tipc_printf(&pb
, "Link <%s>\n"
3049 " %s MTU:%u Priority:%u Tolerance:%u ms"
3050 " Window:%u packets\n",
3051 l_ptr
->name
, status
, link_max_pkt(l_ptr
),
3052 l_ptr
->priority
, l_ptr
->tolerance
, l_ptr
->queue_limit
[0]);
3053 tipc_printf(&pb
, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
3054 l_ptr
->next_in_no
- l_ptr
->stats
.recv_info
,
3055 l_ptr
->stats
.recv_fragments
,
3056 l_ptr
->stats
.recv_fragmented
,
3057 l_ptr
->stats
.recv_bundles
,
3058 l_ptr
->stats
.recv_bundled
);
3059 tipc_printf(&pb
, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
3060 l_ptr
->next_out_no
- l_ptr
->stats
.sent_info
,
3061 l_ptr
->stats
.sent_fragments
,
3062 l_ptr
->stats
.sent_fragmented
,
3063 l_ptr
->stats
.sent_bundles
,
3064 l_ptr
->stats
.sent_bundled
);
3065 profile_total
= l_ptr
->stats
.msg_length_counts
;
3068 tipc_printf(&pb
, " TX profile sample:%u packets average:%u octets\n"
3069 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
3070 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
3071 l_ptr
->stats
.msg_length_counts
,
3072 l_ptr
->stats
.msg_lengths_total
/ profile_total
,
3073 percent(l_ptr
->stats
.msg_length_profile
[0], profile_total
),
3074 percent(l_ptr
->stats
.msg_length_profile
[1], profile_total
),
3075 percent(l_ptr
->stats
.msg_length_profile
[2], profile_total
),
3076 percent(l_ptr
->stats
.msg_length_profile
[3], profile_total
),
3077 percent(l_ptr
->stats
.msg_length_profile
[4], profile_total
),
3078 percent(l_ptr
->stats
.msg_length_profile
[5], profile_total
),
3079 percent(l_ptr
->stats
.msg_length_profile
[6], profile_total
));
3080 tipc_printf(&pb
, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
3081 l_ptr
->stats
.recv_states
,
3082 l_ptr
->stats
.recv_probes
,
3083 l_ptr
->stats
.recv_nacks
,
3084 l_ptr
->stats
.deferred_recv
,
3085 l_ptr
->stats
.duplicates
);
3086 tipc_printf(&pb
, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
3087 l_ptr
->stats
.sent_states
,
3088 l_ptr
->stats
.sent_probes
,
3089 l_ptr
->stats
.sent_nacks
,
3090 l_ptr
->stats
.sent_acks
,
3091 l_ptr
->stats
.retransmitted
);
3092 tipc_printf(&pb
, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
3093 l_ptr
->stats
.bearer_congs
,
3094 l_ptr
->stats
.link_congs
,
3095 l_ptr
->stats
.max_queue_sz
,
3096 l_ptr
->stats
.queue_sz_counts
3097 ? (l_ptr
->stats
.accu_queue_sz
/ l_ptr
->stats
.queue_sz_counts
)
3100 tipc_node_unlock(node
);
3101 read_unlock_bh(&tipc_net_lock
);
3102 return tipc_printbuf_validate(&pb
);
3105 #define MAX_LINK_STATS_INFO 2000
3107 struct sk_buff
*tipc_link_cmd_show_stats(const void *req_tlv_area
, int req_tlv_space
)
3109 struct sk_buff
*buf
;
3110 struct tlv_desc
*rep_tlv
;
3113 if (!TLV_CHECK(req_tlv_area
, req_tlv_space
, TIPC_TLV_LINK_NAME
))
3114 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR
);
3116 buf
= tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO
));
3120 rep_tlv
= (struct tlv_desc
*)buf
->data
;
3122 str_len
= tipc_link_stats((char *)TLV_DATA(req_tlv_area
),
3123 (char *)TLV_DATA(rep_tlv
), MAX_LINK_STATS_INFO
);
3126 return tipc_cfg_reply_error_string("link not found");
3129 skb_put(buf
, TLV_SPACE(str_len
));
3130 TLV_SET(rep_tlv
, TIPC_TLV_ULTRA_STRING
, NULL
, str_len
);
3136 int link_control(const char *name
, u32 op
, u32 val
)
3144 a
= link_name2addr(name
, &bearer_id
);
3145 read_lock_bh(&tipc_net_lock
);
3146 node
= tipc_node_find(a
);
3148 tipc_node_lock(node
);
3149 l_ptr
= node
->links
[bearer_id
];
3151 if (op
== TIPC_REMOVE_LINK
) {
3152 struct bearer
*b_ptr
= l_ptr
->b_ptr
;
3153 spin_lock_bh(&b_ptr
->publ
.lock
);
3154 tipc_link_delete(l_ptr
);
3155 spin_unlock_bh(&b_ptr
->publ
.lock
);
3157 if (op
== TIPC_CMD_BLOCK_LINK
) {
3158 tipc_link_reset(l_ptr
);
3161 if (op
== TIPC_CMD_UNBLOCK_LINK
) {
3166 tipc_node_unlock(node
);
3168 read_unlock_bh(&tipc_net_lock
);
3174 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
3175 * @dest: network address of destination node
3176 * @selector: used to select from set of active links
3178 * If no active link can be found, uses default maximum packet size.
3181 u32
tipc_link_get_max_pkt(u32 dest
, u32 selector
)
3185 u32 res
= MAX_PKT_DEFAULT
;
3187 if (dest
== tipc_own_addr
)
3188 return MAX_MSG_SIZE
;
3190 read_lock_bh(&tipc_net_lock
);
3191 n_ptr
= tipc_node_select(dest
, selector
);
3193 tipc_node_lock(n_ptr
);
3194 l_ptr
= n_ptr
->active_links
[selector
& 1];
3196 res
= link_max_pkt(l_ptr
);
3197 tipc_node_unlock(n_ptr
);
3199 read_unlock_bh(&tipc_net_lock
);
3204 static void link_dump_rec_queue(struct link
*l_ptr
)
3206 struct sk_buff
*crs
;
3208 if (!l_ptr
->oldest_deferred_in
) {
3209 info("Reception queue empty\n");
3212 info("Contents of Reception queue:\n");
3213 crs
= l_ptr
->oldest_deferred_in
;
3215 if (crs
->data
== (void *)0x0000a3a3) {
3216 info("buffer %x invalid\n", crs
);
3219 msg_dbg(buf_msg(crs
), "In rec queue: \n");
3225 static void link_dump_send_queue(struct link
*l_ptr
)
3227 if (l_ptr
->next_out
) {
3228 info("\nContents of unsent queue:\n");
3229 dbg_print_buf_chain(l_ptr
->next_out
);
3231 info("\nContents of send queue:\n");
3232 if (l_ptr
->first_out
) {
3233 dbg_print_buf_chain(l_ptr
->first_out
);
3235 info("Empty send queue\n");
3238 static void link_print(struct link
*l_ptr
, struct print_buf
*buf
,
3241 tipc_printf(buf
, str
);
3242 if (link_reset_reset(l_ptr
) || link_reset_unknown(l_ptr
))
3244 tipc_printf(buf
, "Link %x<%s>:",
3245 l_ptr
->addr
, l_ptr
->b_ptr
->publ
.name
);
3246 tipc_printf(buf
, ": NXO(%u):", mod(l_ptr
->next_out_no
));
3247 tipc_printf(buf
, "NXI(%u):", mod(l_ptr
->next_in_no
));
3248 tipc_printf(buf
, "SQUE");
3249 if (l_ptr
->first_out
) {
3250 tipc_printf(buf
, "[%u..", msg_seqno(buf_msg(l_ptr
->first_out
)));
3251 if (l_ptr
->next_out
)
3252 tipc_printf(buf
, "%u..",
3253 msg_seqno(buf_msg(l_ptr
->next_out
)));
3254 tipc_printf(buf
, "%u]",
3256 (l_ptr
->last_out
)), l_ptr
->out_queue_size
);
3257 if ((mod(msg_seqno(buf_msg(l_ptr
->last_out
)) -
3258 msg_seqno(buf_msg(l_ptr
->first_out
)))
3259 != (l_ptr
->out_queue_size
- 1))
3260 || (l_ptr
->last_out
->next
!= NULL
)) {
3261 tipc_printf(buf
, "\nSend queue inconsistency\n");
3262 tipc_printf(buf
, "first_out= %x ", l_ptr
->first_out
);
3263 tipc_printf(buf
, "next_out= %x ", l_ptr
->next_out
);
3264 tipc_printf(buf
, "last_out= %x ", l_ptr
->last_out
);
3265 link_dump_send_queue(l_ptr
);
3268 tipc_printf(buf
, "[]");
3269 tipc_printf(buf
, "SQSIZ(%u)", l_ptr
->out_queue_size
);
3270 if (l_ptr
->oldest_deferred_in
) {
3271 u32 o
= msg_seqno(buf_msg(l_ptr
->oldest_deferred_in
));
3272 u32 n
= msg_seqno(buf_msg(l_ptr
->newest_deferred_in
));
3273 tipc_printf(buf
, ":RQUE[%u..%u]", o
, n
);
3274 if (l_ptr
->deferred_inqueue_sz
!= mod((n
+ 1) - o
)) {
3275 tipc_printf(buf
, ":RQSIZ(%u)",
3276 l_ptr
->deferred_inqueue_sz
);
3279 if (link_working_unknown(l_ptr
))
3280 tipc_printf(buf
, ":WU");
3281 if (link_reset_reset(l_ptr
))
3282 tipc_printf(buf
, ":RR");
3283 if (link_reset_unknown(l_ptr
))
3284 tipc_printf(buf
, ":RU");
3285 if (link_working_working(l_ptr
))
3286 tipc_printf(buf
, ":WW");
3287 tipc_printf(buf
, "\n");