2 * net/tipc/bcast.c: TIPC broadcast code
4 * Copyright (c) 2004-2006, 2014-2015, Ericsson AB
5 * Copyright (c) 2004, Intel Corporation.
6 * Copyright (c) 2005, 2010-2011, Wind River Systems
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
41 #include "name_distr.h"
44 #define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */
45 #define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */
47 const char tipc_bclink_name
[] = "broadcast-link";
49 static void tipc_nmap_diff(struct tipc_node_map
*nm_a
,
50 struct tipc_node_map
*nm_b
,
51 struct tipc_node_map
*nm_diff
);
52 static void tipc_nmap_add(struct tipc_node_map
*nm_ptr
, u32 node
);
53 static void tipc_nmap_remove(struct tipc_node_map
*nm_ptr
, u32 node
);
55 static void tipc_bclink_lock(struct net
*net
)
57 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
59 spin_lock_bh(&tn
->bclink
->lock
);
62 static void tipc_bclink_unlock(struct net
*net
)
64 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
66 spin_unlock_bh(&tn
->bclink
->lock
);
69 void tipc_bclink_input(struct net
*net
)
71 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
73 tipc_sk_mcast_rcv(net
, &tn
->bclink
->arrvq
, &tn
->bclink
->inputq
);
76 uint
tipc_bclink_get_mtu(void)
78 return MAX_PKT_DEFAULT_MCAST
;
81 static u32
bcbuf_acks(struct sk_buff
*buf
)
83 return (u32
)(unsigned long)TIPC_SKB_CB(buf
)->handle
;
86 static void bcbuf_set_acks(struct sk_buff
*buf
, u32 acks
)
88 TIPC_SKB_CB(buf
)->handle
= (void *)(unsigned long)acks
;
91 static void bcbuf_decr_acks(struct sk_buff
*buf
)
93 bcbuf_set_acks(buf
, bcbuf_acks(buf
) - 1);
96 void tipc_bclink_add_node(struct net
*net
, u32 addr
)
98 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
100 tipc_bclink_lock(net
);
101 tipc_nmap_add(&tn
->bclink
->bcast_nodes
, addr
);
102 tipc_bclink_unlock(net
);
105 void tipc_bclink_remove_node(struct net
*net
, u32 addr
)
107 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
109 tipc_bclink_lock(net
);
110 tipc_nmap_remove(&tn
->bclink
->bcast_nodes
, addr
);
112 /* Last node? => reset backlog queue */
113 if (!tn
->bclink
->bcast_nodes
.count
)
114 tipc_link_purge_backlog(&tn
->bclink
->link
);
116 tipc_bclink_unlock(net
);
119 static void bclink_set_last_sent(struct net
*net
)
121 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
122 struct tipc_link
*bcl
= tn
->bcl
;
124 bcl
->silent_intv_cnt
= mod(bcl
->snd_nxt
- 1);
127 u32
tipc_bclink_get_last_sent(struct net
*net
)
129 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
131 return tn
->bcl
->silent_intv_cnt
;
134 static void bclink_update_last_sent(struct tipc_node
*node
, u32 seqno
)
136 node
->bclink
.last_sent
= less_eq(node
->bclink
.last_sent
, seqno
) ?
137 seqno
: node
->bclink
.last_sent
;
141 * tipc_bclink_retransmit_to - get most recent node to request retransmission
143 * Called with bclink_lock locked
145 struct tipc_node
*tipc_bclink_retransmit_to(struct net
*net
)
147 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
149 return tn
->bclink
->retransmit_to
;
153 * bclink_retransmit_pkt - retransmit broadcast packets
154 * @after: sequence number of last packet to *not* retransmit
155 * @to: sequence number of last packet to retransmit
157 * Called with bclink_lock locked
159 static void bclink_retransmit_pkt(struct tipc_net
*tn
, u32 after
, u32 to
)
162 struct tipc_link
*bcl
= tn
->bcl
;
164 skb_queue_walk(&bcl
->transmq
, skb
) {
165 if (more(buf_seqno(skb
), after
)) {
166 tipc_link_retransmit(bcl
, skb
, mod(to
- after
));
173 * bclink_prepare_wakeup - prepare users for wakeup after congestion
174 * @bcl: broadcast link
175 * @resultq: queue for users which can be woken up
176 * Move a number of waiting users, as permitted by available space in
177 * the send queue, from link wait queue to specified queue for wakeup
179 static void bclink_prepare_wakeup(struct tipc_link
*bcl
, struct sk_buff_head
*resultq
)
181 int pnd
[TIPC_SYSTEM_IMPORTANCE
+ 1] = {0,};
183 struct sk_buff
*skb
, *tmp
;
185 skb_queue_walk_safe(&bcl
->wakeupq
, skb
, tmp
) {
186 imp
= TIPC_SKB_CB(skb
)->chain_imp
;
187 lim
= bcl
->window
+ bcl
->backlog
[imp
].limit
;
188 pnd
[imp
] += TIPC_SKB_CB(skb
)->chain_sz
;
189 if ((pnd
[imp
] + bcl
->backlog
[imp
].len
) >= lim
)
191 skb_unlink(skb
, &bcl
->wakeupq
);
192 skb_queue_tail(resultq
, skb
);
197 * tipc_bclink_wakeup_users - wake up pending users
199 * Called with no locks taken
201 void tipc_bclink_wakeup_users(struct net
*net
)
203 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
204 struct tipc_link
*bcl
= tn
->bcl
;
205 struct sk_buff_head resultq
;
207 skb_queue_head_init(&resultq
);
208 bclink_prepare_wakeup(bcl
, &resultq
);
209 tipc_sk_rcv(net
, &resultq
);
213 * tipc_bclink_acknowledge - handle acknowledgement of broadcast packets
214 * @n_ptr: node that sent acknowledgement info
215 * @acked: broadcast sequence # that has been acknowledged
217 * Node is locked, bclink_lock unlocked.
219 void tipc_bclink_acknowledge(struct tipc_node
*n_ptr
, u32 acked
)
221 struct sk_buff
*skb
, *tmp
;
222 unsigned int released
= 0;
223 struct net
*net
= n_ptr
->net
;
224 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
226 if (unlikely(!n_ptr
->bclink
.recv_permitted
))
229 tipc_bclink_lock(net
);
231 /* Bail out if tx queue is empty (no clean up is required) */
232 skb
= skb_peek(&tn
->bcl
->transmq
);
236 /* Determine which messages need to be acknowledged */
237 if (acked
== INVALID_LINK_SEQ
) {
239 * Contact with specified node has been lost, so need to
240 * acknowledge sent messages only (if other nodes still exist)
241 * or both sent and unsent messages (otherwise)
243 if (tn
->bclink
->bcast_nodes
.count
)
244 acked
= tn
->bcl
->silent_intv_cnt
;
246 acked
= tn
->bcl
->snd_nxt
;
249 * Bail out if specified sequence number does not correspond
250 * to a message that has been sent and not yet acknowledged
252 if (less(acked
, buf_seqno(skb
)) ||
253 less(tn
->bcl
->silent_intv_cnt
, acked
) ||
254 less_eq(acked
, n_ptr
->bclink
.acked
))
258 /* Skip over packets that node has previously acknowledged */
259 skb_queue_walk(&tn
->bcl
->transmq
, skb
) {
260 if (more(buf_seqno(skb
), n_ptr
->bclink
.acked
))
264 /* Update packets that node is now acknowledging */
265 skb_queue_walk_from_safe(&tn
->bcl
->transmq
, skb
, tmp
) {
266 if (more(buf_seqno(skb
), acked
))
268 bcbuf_decr_acks(skb
);
269 bclink_set_last_sent(net
);
270 if (bcbuf_acks(skb
) == 0) {
271 __skb_unlink(skb
, &tn
->bcl
->transmq
);
276 n_ptr
->bclink
.acked
= acked
;
278 /* Try resolving broadcast link congestion, if necessary */
279 if (unlikely(skb_peek(&tn
->bcl
->backlogq
))) {
280 tipc_link_push_packets(tn
->bcl
);
281 bclink_set_last_sent(net
);
283 if (unlikely(released
&& !skb_queue_empty(&tn
->bcl
->wakeupq
)))
284 n_ptr
->action_flags
|= TIPC_WAKEUP_BCAST_USERS
;
286 tipc_bclink_unlock(net
);
290 * tipc_bclink_update_link_state - update broadcast link state
292 * RCU and node lock set
294 void tipc_bclink_update_link_state(struct tipc_node
*n_ptr
,
298 struct net
*net
= n_ptr
->net
;
299 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
301 /* Ignore "stale" link state info */
302 if (less_eq(last_sent
, n_ptr
->bclink
.last_in
))
305 /* Update link synchronization state; quit if in sync */
306 bclink_update_last_sent(n_ptr
, last_sent
);
308 if (n_ptr
->bclink
.last_sent
== n_ptr
->bclink
.last_in
)
311 /* Update out-of-sync state; quit if loss is still unconfirmed */
312 if ((++n_ptr
->bclink
.oos_state
) == 1) {
313 if (n_ptr
->bclink
.deferred_size
< (TIPC_MIN_LINK_WIN
/ 2))
315 n_ptr
->bclink
.oos_state
++;
318 /* Don't NACK if one has been recently sent (or seen) */
319 if (n_ptr
->bclink
.oos_state
& 0x1)
323 buf
= tipc_buf_acquire(INT_H_SIZE
);
325 struct tipc_msg
*msg
= buf_msg(buf
);
326 struct sk_buff
*skb
= skb_peek(&n_ptr
->bclink
.deferdq
);
327 u32 to
= skb
? buf_seqno(skb
) - 1 : n_ptr
->bclink
.last_sent
;
329 tipc_msg_init(tn
->own_addr
, msg
, BCAST_PROTOCOL
, STATE_MSG
,
330 INT_H_SIZE
, n_ptr
->addr
);
331 msg_set_non_seq(msg
, 1);
332 msg_set_mc_netid(msg
, tn
->net_id
);
333 msg_set_bcast_ack(msg
, n_ptr
->bclink
.last_in
);
334 msg_set_bcgap_after(msg
, n_ptr
->bclink
.last_in
);
335 msg_set_bcgap_to(msg
, to
);
337 tipc_bclink_lock(net
);
338 tipc_bearer_send(net
, MAX_BEARERS
, buf
, NULL
);
339 tn
->bcl
->stats
.sent_nacks
++;
340 tipc_bclink_unlock(net
);
343 n_ptr
->bclink
.oos_state
++;
347 void tipc_bclink_sync_state(struct tipc_node
*n
, struct tipc_msg
*hdr
)
349 u16 last
= msg_last_bcast(hdr
);
350 int mtyp
= msg_type(hdr
);
352 if (unlikely(msg_user(hdr
) != LINK_PROTOCOL
))
354 if (mtyp
== STATE_MSG
) {
355 tipc_bclink_update_link_state(n
, last
);
358 /* Compatibility: older nodes don't know BCAST_PROTOCOL synchronization,
359 * and transfer synch info in LINK_PROTOCOL messages.
361 if (tipc_node_is_up(n
))
363 if ((mtyp
!= RESET_MSG
) && (mtyp
!= ACTIVATE_MSG
))
365 n
->bclink
.last_sent
= last
;
366 n
->bclink
.last_in
= last
;
367 n
->bclink
.oos_state
= 0;
371 * bclink_peek_nack - monitor retransmission requests sent by other nodes
373 * Delay any upcoming NACK by this node if another node has already
374 * requested the first message this node is going to ask for.
376 static void bclink_peek_nack(struct net
*net
, struct tipc_msg
*msg
)
378 struct tipc_node
*n_ptr
= tipc_node_find(net
, msg_destnode(msg
));
380 if (unlikely(!n_ptr
))
383 tipc_node_lock(n_ptr
);
384 if (n_ptr
->bclink
.recv_permitted
&&
385 (n_ptr
->bclink
.last_in
!= n_ptr
->bclink
.last_sent
) &&
386 (n_ptr
->bclink
.last_in
== msg_bcgap_after(msg
)))
387 n_ptr
->bclink
.oos_state
= 2;
388 tipc_node_unlock(n_ptr
);
389 tipc_node_put(n_ptr
);
392 /* tipc_bclink_xmit - deliver buffer chain to all nodes in cluster
393 * and to identified node local sockets
394 * @net: the applicable net namespace
395 * @list: chain of buffers containing message
396 * Consumes the buffer chain, except when returning -ELINKCONG
397 * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
399 int tipc_bclink_xmit(struct net
*net
, struct sk_buff_head
*list
)
401 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
402 struct tipc_link
*bcl
= tn
->bcl
;
403 struct tipc_bclink
*bclink
= tn
->bclink
;
407 struct sk_buff_head arrvq
;
408 struct sk_buff_head inputq
;
410 /* Prepare clone of message for local node */
411 skb
= tipc_msg_reassemble(list
);
413 return -EHOSTUNREACH
;
415 /* Broadcast to all nodes */
416 if (likely(bclink
)) {
417 tipc_bclink_lock(net
);
418 if (likely(bclink
->bcast_nodes
.count
)) {
419 rc
= __tipc_link_xmit(net
, bcl
, list
);
421 u32 len
= skb_queue_len(&bcl
->transmq
);
423 bclink_set_last_sent(net
);
424 bcl
->stats
.queue_sz_counts
++;
425 bcl
->stats
.accu_queue_sz
+= len
;
429 tipc_bclink_unlock(net
);
433 __skb_queue_purge(list
);
439 /* Deliver message clone */
440 __skb_queue_head_init(&arrvq
);
441 skb_queue_head_init(&inputq
);
442 __skb_queue_tail(&arrvq
, skb
);
443 tipc_sk_mcast_rcv(net
, &arrvq
, &inputq
);
448 * bclink_accept_pkt - accept an incoming, in-sequence broadcast packet
450 * Called with both sending node's lock and bclink_lock taken.
452 static void bclink_accept_pkt(struct tipc_node
*node
, u32 seqno
)
454 struct tipc_net
*tn
= net_generic(node
->net
, tipc_net_id
);
456 bclink_update_last_sent(node
, seqno
);
457 node
->bclink
.last_in
= seqno
;
458 node
->bclink
.oos_state
= 0;
459 tn
->bcl
->stats
.recv_info
++;
462 * Unicast an ACK periodically, ensuring that
463 * all nodes in the cluster don't ACK at the same time
465 if (((seqno
- tn
->own_addr
) % TIPC_MIN_LINK_WIN
) == 0) {
466 tipc_link_proto_xmit(node_active_link(node
, node
->addr
),
467 STATE_MSG
, 0, 0, 0, 0);
468 tn
->bcl
->stats
.sent_acks
++;
473 * tipc_bclink_rcv - receive a broadcast packet, and deliver upwards
475 * RCU is locked, no other locks set
477 void tipc_bclink_rcv(struct net
*net
, struct sk_buff
*buf
)
479 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
480 struct tipc_link
*bcl
= tn
->bcl
;
481 struct tipc_msg
*msg
= buf_msg(buf
);
482 struct tipc_node
*node
;
487 struct sk_buff
*iskb
;
488 struct sk_buff_head
*arrvq
, *inputq
;
490 /* Screen out unwanted broadcast messages */
491 if (msg_mc_netid(msg
) != tn
->net_id
)
494 node
= tipc_node_find(net
, msg_prevnode(msg
));
498 tipc_node_lock(node
);
499 if (unlikely(!node
->bclink
.recv_permitted
))
502 /* Handle broadcast protocol message */
503 if (unlikely(msg_user(msg
) == BCAST_PROTOCOL
)) {
504 if (msg_type(msg
) != STATE_MSG
)
506 if (msg_destnode(msg
) == tn
->own_addr
) {
507 tipc_bclink_acknowledge(node
, msg_bcast_ack(msg
));
508 tipc_bclink_lock(net
);
509 bcl
->stats
.recv_nacks
++;
510 tn
->bclink
->retransmit_to
= node
;
511 bclink_retransmit_pkt(tn
, msg_bcgap_after(msg
),
513 tipc_bclink_unlock(net
);
514 tipc_node_unlock(node
);
516 tipc_node_unlock(node
);
517 bclink_peek_nack(net
, msg
);
523 /* Handle in-sequence broadcast message */
524 seqno
= msg_seqno(msg
);
525 next_in
= mod(node
->bclink
.last_in
+ 1);
526 arrvq
= &tn
->bclink
->arrvq
;
527 inputq
= &tn
->bclink
->inputq
;
529 if (likely(seqno
== next_in
)) {
531 /* Deliver message to destination */
532 if (likely(msg_isdata(msg
))) {
533 tipc_bclink_lock(net
);
534 bclink_accept_pkt(node
, seqno
);
535 spin_lock_bh(&inputq
->lock
);
536 __skb_queue_tail(arrvq
, buf
);
537 spin_unlock_bh(&inputq
->lock
);
538 node
->action_flags
|= TIPC_BCAST_MSG_EVT
;
539 tipc_bclink_unlock(net
);
540 tipc_node_unlock(node
);
541 } else if (msg_user(msg
) == MSG_BUNDLER
) {
542 tipc_bclink_lock(net
);
543 bclink_accept_pkt(node
, seqno
);
544 bcl
->stats
.recv_bundles
++;
545 bcl
->stats
.recv_bundled
+= msg_msgcnt(msg
);
547 while (tipc_msg_extract(buf
, &iskb
, &pos
)) {
548 spin_lock_bh(&inputq
->lock
);
549 __skb_queue_tail(arrvq
, iskb
);
550 spin_unlock_bh(&inputq
->lock
);
552 node
->action_flags
|= TIPC_BCAST_MSG_EVT
;
553 tipc_bclink_unlock(net
);
554 tipc_node_unlock(node
);
555 } else if (msg_user(msg
) == MSG_FRAGMENTER
) {
556 tipc_bclink_lock(net
);
557 bclink_accept_pkt(node
, seqno
);
558 tipc_buf_append(&node
->bclink
.reasm_buf
, &buf
);
559 if (unlikely(!buf
&& !node
->bclink
.reasm_buf
)) {
560 tipc_bclink_unlock(net
);
563 bcl
->stats
.recv_fragments
++;
565 bcl
->stats
.recv_fragmented
++;
567 tipc_bclink_unlock(net
);
570 tipc_bclink_unlock(net
);
571 tipc_node_unlock(node
);
573 tipc_bclink_lock(net
);
574 bclink_accept_pkt(node
, seqno
);
575 tipc_bclink_unlock(net
);
576 tipc_node_unlock(node
);
581 /* Determine new synchronization state */
582 tipc_node_lock(node
);
583 if (unlikely(!tipc_node_is_up(node
)))
586 if (node
->bclink
.last_in
== node
->bclink
.last_sent
)
589 if (skb_queue_empty(&node
->bclink
.deferdq
)) {
590 node
->bclink
.oos_state
= 1;
594 msg
= buf_msg(skb_peek(&node
->bclink
.deferdq
));
595 seqno
= msg_seqno(msg
);
596 next_in
= mod(next_in
+ 1);
597 if (seqno
!= next_in
)
600 /* Take in-sequence message from deferred queue & deliver it */
601 buf
= __skb_dequeue(&node
->bclink
.deferdq
);
605 /* Handle out-of-sequence broadcast message */
606 if (less(next_in
, seqno
)) {
607 deferred
= tipc_link_defer_pkt(&node
->bclink
.deferdq
,
609 bclink_update_last_sent(node
, seqno
);
613 tipc_bclink_lock(net
);
616 bcl
->stats
.deferred_recv
++;
618 bcl
->stats
.duplicates
++;
620 tipc_bclink_unlock(net
);
623 tipc_node_unlock(node
);
629 u32
tipc_bclink_acks_missing(struct tipc_node
*n_ptr
)
631 return (n_ptr
->bclink
.recv_permitted
&&
632 (tipc_bclink_get_last_sent(n_ptr
->net
) != n_ptr
->bclink
.acked
));
637 * tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer
639 * Send packet over as many bearers as necessary to reach all nodes
640 * that have joined the broadcast link.
642 * Returns 0 (packet sent successfully) under all circumstances,
643 * since the broadcast link's pseudo-bearer never blocks
645 static int tipc_bcbearer_send(struct net
*net
, struct sk_buff
*buf
,
646 struct tipc_bearer
*unused1
,
647 struct tipc_media_addr
*unused2
)
650 struct tipc_msg
*msg
= buf_msg(buf
);
651 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
652 struct tipc_bcbearer
*bcbearer
= tn
->bcbearer
;
653 struct tipc_bclink
*bclink
= tn
->bclink
;
655 /* Prepare broadcast link message for reliable transmission,
656 * if first time trying to send it;
657 * preparation is skipped for broadcast link protocol messages
658 * since they are sent in an unreliable manner and don't need it
660 if (likely(!msg_non_seq(buf_msg(buf
)))) {
661 bcbuf_set_acks(buf
, bclink
->bcast_nodes
.count
);
662 msg_set_non_seq(msg
, 1);
663 msg_set_mc_netid(msg
, tn
->net_id
);
664 tn
->bcl
->stats
.sent_info
++;
665 if (WARN_ON(!bclink
->bcast_nodes
.count
)) {
671 /* Send buffer over bearers until all targets reached */
672 bcbearer
->remains
= bclink
->bcast_nodes
;
674 for (bp_index
= 0; bp_index
< MAX_BEARERS
; bp_index
++) {
675 struct tipc_bearer
*p
= bcbearer
->bpairs
[bp_index
].primary
;
676 struct tipc_bearer
*s
= bcbearer
->bpairs
[bp_index
].secondary
;
677 struct tipc_bearer
*bp
[2] = {p
, s
};
678 struct tipc_bearer
*b
= bp
[msg_link_selector(msg
)];
679 struct sk_buff
*tbuf
;
682 break; /* No more bearers to try */
685 tipc_nmap_diff(&bcbearer
->remains
, &b
->nodes
,
686 &bcbearer
->remains_new
);
687 if (bcbearer
->remains_new
.count
== bcbearer
->remains
.count
)
688 continue; /* Nothing added by bearer pair */
691 /* Use original buffer for first bearer */
692 tipc_bearer_send(net
, b
->identity
, buf
, &b
->bcast_addr
);
694 /* Avoid concurrent buffer access */
695 tbuf
= pskb_copy_for_clone(buf
, GFP_ATOMIC
);
698 tipc_bearer_send(net
, b
->identity
, tbuf
,
700 kfree_skb(tbuf
); /* Bearer keeps a clone */
702 if (bcbearer
->remains_new
.count
== 0)
703 break; /* All targets reached */
705 bcbearer
->remains
= bcbearer
->remains_new
;
712 * tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer
714 void tipc_bcbearer_sort(struct net
*net
, struct tipc_node_map
*nm_ptr
,
715 u32 node
, bool action
)
717 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
718 struct tipc_bcbearer
*bcbearer
= tn
->bcbearer
;
719 struct tipc_bcbearer_pair
*bp_temp
= bcbearer
->bpairs_temp
;
720 struct tipc_bcbearer_pair
*bp_curr
;
721 struct tipc_bearer
*b
;
725 tipc_bclink_lock(net
);
728 tipc_nmap_add(nm_ptr
, node
);
730 tipc_nmap_remove(nm_ptr
, node
);
732 /* Group bearers by priority (can assume max of two per priority) */
733 memset(bp_temp
, 0, sizeof(bcbearer
->bpairs_temp
));
736 for (b_index
= 0; b_index
< MAX_BEARERS
; b_index
++) {
737 b
= rcu_dereference_rtnl(tn
->bearer_list
[b_index
]);
738 if (!b
|| !b
->nodes
.count
)
741 if (!bp_temp
[b
->priority
].primary
)
742 bp_temp
[b
->priority
].primary
= b
;
744 bp_temp
[b
->priority
].secondary
= b
;
748 /* Create array of bearer pairs for broadcasting */
749 bp_curr
= bcbearer
->bpairs
;
750 memset(bcbearer
->bpairs
, 0, sizeof(bcbearer
->bpairs
));
752 for (pri
= TIPC_MAX_LINK_PRI
; pri
>= 0; pri
--) {
754 if (!bp_temp
[pri
].primary
)
757 bp_curr
->primary
= bp_temp
[pri
].primary
;
759 if (bp_temp
[pri
].secondary
) {
760 if (tipc_nmap_equal(&bp_temp
[pri
].primary
->nodes
,
761 &bp_temp
[pri
].secondary
->nodes
)) {
762 bp_curr
->secondary
= bp_temp
[pri
].secondary
;
765 bp_curr
->primary
= bp_temp
[pri
].secondary
;
772 tipc_bclink_unlock(net
);
775 static int __tipc_nl_add_bc_link_stat(struct sk_buff
*skb
,
776 struct tipc_stats
*stats
)
786 struct nla_map map
[] = {
787 {TIPC_NLA_STATS_RX_INFO
, stats
->recv_info
},
788 {TIPC_NLA_STATS_RX_FRAGMENTS
, stats
->recv_fragments
},
789 {TIPC_NLA_STATS_RX_FRAGMENTED
, stats
->recv_fragmented
},
790 {TIPC_NLA_STATS_RX_BUNDLES
, stats
->recv_bundles
},
791 {TIPC_NLA_STATS_RX_BUNDLED
, stats
->recv_bundled
},
792 {TIPC_NLA_STATS_TX_INFO
, stats
->sent_info
},
793 {TIPC_NLA_STATS_TX_FRAGMENTS
, stats
->sent_fragments
},
794 {TIPC_NLA_STATS_TX_FRAGMENTED
, stats
->sent_fragmented
},
795 {TIPC_NLA_STATS_TX_BUNDLES
, stats
->sent_bundles
},
796 {TIPC_NLA_STATS_TX_BUNDLED
, stats
->sent_bundled
},
797 {TIPC_NLA_STATS_RX_NACKS
, stats
->recv_nacks
},
798 {TIPC_NLA_STATS_RX_DEFERRED
, stats
->deferred_recv
},
799 {TIPC_NLA_STATS_TX_NACKS
, stats
->sent_nacks
},
800 {TIPC_NLA_STATS_TX_ACKS
, stats
->sent_acks
},
801 {TIPC_NLA_STATS_RETRANSMITTED
, stats
->retransmitted
},
802 {TIPC_NLA_STATS_DUPLICATES
, stats
->duplicates
},
803 {TIPC_NLA_STATS_LINK_CONGS
, stats
->link_congs
},
804 {TIPC_NLA_STATS_MAX_QUEUE
, stats
->max_queue_sz
},
805 {TIPC_NLA_STATS_AVG_QUEUE
, stats
->queue_sz_counts
?
806 (stats
->accu_queue_sz
/ stats
->queue_sz_counts
) : 0}
809 nest
= nla_nest_start(skb
, TIPC_NLA_LINK_STATS
);
813 for (i
= 0; i
< ARRAY_SIZE(map
); i
++)
814 if (nla_put_u32(skb
, map
[i
].key
, map
[i
].val
))
817 nla_nest_end(skb
, nest
);
821 nla_nest_cancel(skb
, nest
);
826 int tipc_nl_add_bc_link(struct net
*net
, struct tipc_nl_msg
*msg
)
830 struct nlattr
*attrs
;
832 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
833 struct tipc_link
*bcl
= tn
->bcl
;
838 tipc_bclink_lock(net
);
840 hdr
= genlmsg_put(msg
->skb
, msg
->portid
, msg
->seq
, &tipc_genl_family
,
841 NLM_F_MULTI
, TIPC_NL_LINK_GET
);
845 attrs
= nla_nest_start(msg
->skb
, TIPC_NLA_LINK
);
849 /* The broadcast link is always up */
850 if (nla_put_flag(msg
->skb
, TIPC_NLA_LINK_UP
))
853 if (nla_put_flag(msg
->skb
, TIPC_NLA_LINK_BROADCAST
))
855 if (nla_put_string(msg
->skb
, TIPC_NLA_LINK_NAME
, bcl
->name
))
857 if (nla_put_u32(msg
->skb
, TIPC_NLA_LINK_RX
, bcl
->rcv_nxt
))
859 if (nla_put_u32(msg
->skb
, TIPC_NLA_LINK_TX
, bcl
->snd_nxt
))
862 prop
= nla_nest_start(msg
->skb
, TIPC_NLA_LINK_PROP
);
865 if (nla_put_u32(msg
->skb
, TIPC_NLA_PROP_WIN
, bcl
->window
))
867 nla_nest_end(msg
->skb
, prop
);
869 err
= __tipc_nl_add_bc_link_stat(msg
->skb
, &bcl
->stats
);
873 tipc_bclink_unlock(net
);
874 nla_nest_end(msg
->skb
, attrs
);
875 genlmsg_end(msg
->skb
, hdr
);
880 nla_nest_cancel(msg
->skb
, prop
);
882 nla_nest_cancel(msg
->skb
, attrs
);
884 tipc_bclink_unlock(net
);
885 genlmsg_cancel(msg
->skb
, hdr
);
890 int tipc_bclink_reset_stats(struct net
*net
)
892 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
893 struct tipc_link
*bcl
= tn
->bcl
;
898 tipc_bclink_lock(net
);
899 memset(&bcl
->stats
, 0, sizeof(bcl
->stats
));
900 tipc_bclink_unlock(net
);
904 int tipc_bclink_set_queue_limits(struct net
*net
, u32 limit
)
906 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
907 struct tipc_link
*bcl
= tn
->bcl
;
911 if ((limit
< TIPC_MIN_LINK_WIN
) || (limit
> TIPC_MAX_LINK_WIN
))
914 tipc_bclink_lock(net
);
915 tipc_link_set_queue_limits(bcl
, limit
);
916 tipc_bclink_unlock(net
);
920 int tipc_nl_bc_link_set(struct net
*net
, struct nlattr
*attrs
[])
924 struct nlattr
*props
[TIPC_NLA_PROP_MAX
+ 1];
926 if (!attrs
[TIPC_NLA_LINK_PROP
])
929 err
= tipc_nl_parse_link_prop(attrs
[TIPC_NLA_LINK_PROP
], props
);
933 if (!props
[TIPC_NLA_PROP_WIN
])
936 win
= nla_get_u32(props
[TIPC_NLA_PROP_WIN
]);
938 return tipc_bclink_set_queue_limits(net
, win
);
941 int tipc_bclink_init(struct net
*net
)
943 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
944 struct tipc_bcbearer
*bcbearer
;
945 struct tipc_bclink
*bclink
;
946 struct tipc_link
*bcl
;
948 bcbearer
= kzalloc(sizeof(*bcbearer
), GFP_ATOMIC
);
952 bclink
= kzalloc(sizeof(*bclink
), GFP_ATOMIC
);
959 bcbearer
->bearer
.media
= &bcbearer
->media
;
960 bcbearer
->media
.send_msg
= tipc_bcbearer_send
;
961 sprintf(bcbearer
->media
.name
, "tipc-broadcast");
963 spin_lock_init(&bclink
->lock
);
964 __skb_queue_head_init(&bcl
->transmq
);
965 __skb_queue_head_init(&bcl
->backlogq
);
966 __skb_queue_head_init(&bcl
->deferdq
);
967 skb_queue_head_init(&bcl
->wakeupq
);
969 spin_lock_init(&bclink
->node
.lock
);
970 __skb_queue_head_init(&bclink
->arrvq
);
971 skb_queue_head_init(&bclink
->inputq
);
972 bcl
->owner
= &bclink
->node
;
973 bcl
->owner
->net
= net
;
974 bcl
->mtu
= MAX_PKT_DEFAULT_MCAST
;
975 tipc_link_set_queue_limits(bcl
, BCLINK_WIN_DEFAULT
);
976 bcl
->bearer_id
= MAX_BEARERS
;
977 rcu_assign_pointer(tn
->bearer_list
[MAX_BEARERS
], &bcbearer
->bearer
);
978 bcl
->pmsg
= (struct tipc_msg
*)&bcl
->proto_msg
;
979 msg_set_prevnode(bcl
->pmsg
, tn
->own_addr
);
980 strlcpy(bcl
->name
, tipc_bclink_name
, TIPC_MAX_LINK_NAME
);
981 tn
->bcbearer
= bcbearer
;
987 void tipc_bclink_stop(struct net
*net
)
989 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
991 tipc_bclink_lock(net
);
992 tipc_link_purge_queues(tn
->bcl
);
993 tipc_bclink_unlock(net
);
995 RCU_INIT_POINTER(tn
->bearer_list
[BCBEARER
], NULL
);
1002 * tipc_nmap_add - add a node to a node map
1004 static void tipc_nmap_add(struct tipc_node_map
*nm_ptr
, u32 node
)
1006 int n
= tipc_node(node
);
1008 u32 mask
= (1 << (n
% WSIZE
));
1010 if ((nm_ptr
->map
[w
] & mask
) == 0) {
1012 nm_ptr
->map
[w
] |= mask
;
1017 * tipc_nmap_remove - remove a node from a node map
1019 static void tipc_nmap_remove(struct tipc_node_map
*nm_ptr
, u32 node
)
1021 int n
= tipc_node(node
);
1023 u32 mask
= (1 << (n
% WSIZE
));
1025 if ((nm_ptr
->map
[w
] & mask
) != 0) {
1026 nm_ptr
->map
[w
] &= ~mask
;
1032 * tipc_nmap_diff - find differences between node maps
1033 * @nm_a: input node map A
1034 * @nm_b: input node map B
1035 * @nm_diff: output node map A-B (i.e. nodes of A that are not in B)
1037 static void tipc_nmap_diff(struct tipc_node_map
*nm_a
,
1038 struct tipc_node_map
*nm_b
,
1039 struct tipc_node_map
*nm_diff
)
1041 int stop
= ARRAY_SIZE(nm_a
->map
);
1046 memset(nm_diff
, 0, sizeof(*nm_diff
));
1047 for (w
= 0; w
< stop
; w
++) {
1048 map
= nm_a
->map
[w
] ^ (nm_a
->map
[w
] & nm_b
->map
[w
]);
1049 nm_diff
->map
[w
] = map
;
1051 for (b
= 0 ; b
< WSIZE
; b
++) {