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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
4 */
5
6#include <linux/skbuff.h>
7#include <linux/if_ether.h>
8#include <linux/netdevice.h>
9#include <linux/spinlock.h>
10#include <linux/ethtool.h>
11#include <linux/etherdevice.h>
12#include <linux/if_bonding.h>
13#include <linux/pkt_sched.h>
14#include <net/net_namespace.h>
15#include <net/bonding.h>
16#include <net/bond_3ad.h>
17#include <net/netlink.h>
18
19/* General definitions */
20#define AD_SHORT_TIMEOUT 1
21#define AD_LONG_TIMEOUT 0
22#define AD_STANDBY 0x2
23#define AD_MAX_TX_IN_SECOND 3
24#define AD_COLLECTOR_MAX_DELAY 0
25
26/* Timer definitions (43.4.4 in the 802.3ad standard) */
27#define AD_FAST_PERIODIC_TIME 1
28#define AD_SLOW_PERIODIC_TIME 30
29#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
30#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
31#define AD_CHURN_DETECTION_TIME 60
32#define AD_AGGREGATE_WAIT_TIME 2
33
34/* Port state definitions (43.4.2.2 in the 802.3ad standard) */
35#define AD_STATE_LACP_ACTIVITY 0x1
36#define AD_STATE_LACP_TIMEOUT 0x2
37#define AD_STATE_AGGREGATION 0x4
38#define AD_STATE_SYNCHRONIZATION 0x8
39#define AD_STATE_COLLECTING 0x10
40#define AD_STATE_DISTRIBUTING 0x20
41#define AD_STATE_DEFAULTED 0x40
42#define AD_STATE_EXPIRED 0x80
43
44/* Port Variables definitions used by the State Machines (43.4.7 in the
45 * 802.3ad standard)
46 */
47#define AD_PORT_BEGIN 0x1
48#define AD_PORT_LACP_ENABLED 0x2
49#define AD_PORT_ACTOR_CHURN 0x4
50#define AD_PORT_PARTNER_CHURN 0x8
51#define AD_PORT_READY 0x10
52#define AD_PORT_READY_N 0x20
53#define AD_PORT_MATCHED 0x40
54#define AD_PORT_STANDBY 0x80
55#define AD_PORT_SELECTED 0x100
56#define AD_PORT_MOVED 0x200
57#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
58
59/* Port Key definitions
60 * key is determined according to the link speed, duplex and
61 * user key (which is yet not supported)
62 * --------------------------------------------------------------
63 * Port key | User key (10 bits) | Speed (5 bits) | Duplex|
64 * --------------------------------------------------------------
65 * |15 6|5 1|0
66 */
67#define AD_DUPLEX_KEY_MASKS 0x1
68#define AD_SPEED_KEY_MASKS 0x3E
69#define AD_USER_KEY_MASKS 0xFFC0
70
71enum ad_link_speed_type {
72 AD_LINK_SPEED_1MBPS = 1,
73 AD_LINK_SPEED_10MBPS,
74 AD_LINK_SPEED_100MBPS,
75 AD_LINK_SPEED_1000MBPS,
76 AD_LINK_SPEED_2500MBPS,
77 AD_LINK_SPEED_5000MBPS,
78 AD_LINK_SPEED_10000MBPS,
79 AD_LINK_SPEED_14000MBPS,
80 AD_LINK_SPEED_20000MBPS,
81 AD_LINK_SPEED_25000MBPS,
82 AD_LINK_SPEED_40000MBPS,
83 AD_LINK_SPEED_50000MBPS,
84 AD_LINK_SPEED_56000MBPS,
85 AD_LINK_SPEED_100000MBPS,
86};
87
88/* compare MAC addresses */
89#define MAC_ADDRESS_EQUAL(A, B) \
90 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
91
92static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
93 0, 0, 0, 0, 0, 0
94};
95static u16 ad_ticks_per_sec;
96static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
97
98static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned =
99 MULTICAST_LACPDU_ADDR;
100
101/* ================= main 802.3ad protocol functions ================== */
102static int ad_lacpdu_send(struct port *port);
103static int ad_marker_send(struct port *port, struct bond_marker *marker);
104static void ad_mux_machine(struct port *port, bool *update_slave_arr);
105static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
106static void ad_tx_machine(struct port *port);
107static void ad_periodic_machine(struct port *port);
108static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
109static void ad_agg_selection_logic(struct aggregator *aggregator,
110 bool *update_slave_arr);
111static void ad_clear_agg(struct aggregator *aggregator);
112static void ad_initialize_agg(struct aggregator *aggregator);
113static void ad_initialize_port(struct port *port, int lacp_fast);
114static void ad_enable_collecting_distributing(struct port *port,
115 bool *update_slave_arr);
116static void ad_disable_collecting_distributing(struct port *port,
117 bool *update_slave_arr);
118static void ad_marker_info_received(struct bond_marker *marker_info,
119 struct port *port);
120static void ad_marker_response_received(struct bond_marker *marker,
121 struct port *port);
122static void ad_update_actor_keys(struct port *port, bool reset);
123
124
125/* ================= api to bonding and kernel code ================== */
126
127/**
128 * __get_bond_by_port - get the port's bonding struct
129 * @port: the port we're looking at
130 *
131 * Return @port's bonding struct, or %NULL if it can't be found.
132 */
133static inline struct bonding *__get_bond_by_port(struct port *port)
134{
135 if (port->slave == NULL)
136 return NULL;
137
138 return bond_get_bond_by_slave(port->slave);
139}
140
141/**
142 * __get_first_agg - get the first aggregator in the bond
143 * @bond: the bond we're looking at
144 *
145 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
146 * found.
147 * The caller must hold RCU or RTNL lock.
148 */
149static inline struct aggregator *__get_first_agg(struct port *port)
150{
151 struct bonding *bond = __get_bond_by_port(port);
152 struct slave *first_slave;
153 struct aggregator *agg;
154
155 /* If there's no bond for this port, or bond has no slaves */
156 if (bond == NULL)
157 return NULL;
158
159 rcu_read_lock();
160 first_slave = bond_first_slave_rcu(bond);
161 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
162 rcu_read_unlock();
163
164 return agg;
165}
166
167/**
168 * __agg_has_partner - see if we have a partner
169 * @agg: the agregator we're looking at
170 *
171 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
172 * address for the partner). Return 0 if not.
173 */
174static inline int __agg_has_partner(struct aggregator *agg)
175{
176 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
177}
178
179/**
180 * __disable_port - disable the port's slave
181 * @port: the port we're looking at
182 */
183static inline void __disable_port(struct port *port)
184{
185 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
186}
187
188/**
189 * __enable_port - enable the port's slave, if it's up
190 * @port: the port we're looking at
191 */
192static inline void __enable_port(struct port *port)
193{
194 struct slave *slave = port->slave;
195
196 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
197 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
198}
199
200/**
201 * __port_is_enabled - check if the port's slave is in active state
202 * @port: the port we're looking at
203 */
204static inline int __port_is_enabled(struct port *port)
205{
206 return bond_is_active_slave(port->slave);
207}
208
209/**
210 * __get_agg_selection_mode - get the aggregator selection mode
211 * @port: the port we're looking at
212 *
213 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
214 */
215static inline u32 __get_agg_selection_mode(struct port *port)
216{
217 struct bonding *bond = __get_bond_by_port(port);
218
219 if (bond == NULL)
220 return BOND_AD_STABLE;
221
222 return bond->params.ad_select;
223}
224
225/**
226 * __check_agg_selection_timer - check if the selection timer has expired
227 * @port: the port we're looking at
228 */
229static inline int __check_agg_selection_timer(struct port *port)
230{
231 struct bonding *bond = __get_bond_by_port(port);
232
233 if (bond == NULL)
234 return 0;
235
236 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
237}
238
239/**
240 * __get_link_speed - get a port's speed
241 * @port: the port we're looking at
242 *
243 * Return @port's speed in 802.3ad enum format. i.e. one of:
244 * 0,
245 * %AD_LINK_SPEED_10MBPS,
246 * %AD_LINK_SPEED_100MBPS,
247 * %AD_LINK_SPEED_1000MBPS,
248 * %AD_LINK_SPEED_2500MBPS,
249 * %AD_LINK_SPEED_5000MBPS,
250 * %AD_LINK_SPEED_10000MBPS
251 * %AD_LINK_SPEED_14000MBPS,
252 * %AD_LINK_SPEED_20000MBPS
253 * %AD_LINK_SPEED_25000MBPS
254 * %AD_LINK_SPEED_40000MBPS
255 * %AD_LINK_SPEED_50000MBPS
256 * %AD_LINK_SPEED_56000MBPS
257 * %AD_LINK_SPEED_100000MBPS
258 */
259static u16 __get_link_speed(struct port *port)
260{
261 struct slave *slave = port->slave;
262 u16 speed;
263
264 /* this if covers only a special case: when the configuration starts
265 * with link down, it sets the speed to 0.
266 * This is done in spite of the fact that the e100 driver reports 0
267 * to be compatible with MVT in the future.
268 */
269 if (slave->link != BOND_LINK_UP)
270 speed = 0;
271 else {
272 switch (slave->speed) {
273 case SPEED_10:
274 speed = AD_LINK_SPEED_10MBPS;
275 break;
276
277 case SPEED_100:
278 speed = AD_LINK_SPEED_100MBPS;
279 break;
280
281 case SPEED_1000:
282 speed = AD_LINK_SPEED_1000MBPS;
283 break;
284
285 case SPEED_2500:
286 speed = AD_LINK_SPEED_2500MBPS;
287 break;
288
289 case SPEED_5000:
290 speed = AD_LINK_SPEED_5000MBPS;
291 break;
292
293 case SPEED_10000:
294 speed = AD_LINK_SPEED_10000MBPS;
295 break;
296
297 case SPEED_14000:
298 speed = AD_LINK_SPEED_14000MBPS;
299 break;
300
301 case SPEED_20000:
302 speed = AD_LINK_SPEED_20000MBPS;
303 break;
304
305 case SPEED_25000:
306 speed = AD_LINK_SPEED_25000MBPS;
307 break;
308
309 case SPEED_40000:
310 speed = AD_LINK_SPEED_40000MBPS;
311 break;
312
313 case SPEED_50000:
314 speed = AD_LINK_SPEED_50000MBPS;
315 break;
316
317 case SPEED_56000:
318 speed = AD_LINK_SPEED_56000MBPS;
319 break;
320
321 case SPEED_100000:
322 speed = AD_LINK_SPEED_100000MBPS;
323 break;
324
325 default:
326 /* unknown speed value from ethtool. shouldn't happen */
327 if (slave->speed != SPEED_UNKNOWN)
328 pr_warn_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n",
329 slave->bond->dev->name,
330 slave->dev->name, slave->speed,
331 port->actor_port_number);
332 speed = 0;
333 break;
334 }
335 }
336
337 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n",
338 port->actor_port_number, speed);
339 return speed;
340}
341
342/**
343 * __get_duplex - get a port's duplex
344 * @port: the port we're looking at
345 *
346 * Return @port's duplex in 802.3ad bitmask format. i.e.:
347 * 0x01 if in full duplex
348 * 0x00 otherwise
349 */
350static u8 __get_duplex(struct port *port)
351{
352 struct slave *slave = port->slave;
353 u8 retval = 0x0;
354
355 /* handling a special case: when the configuration starts with
356 * link down, it sets the duplex to 0.
357 */
358 if (slave->link == BOND_LINK_UP) {
359 switch (slave->duplex) {
360 case DUPLEX_FULL:
361 retval = 0x1;
362 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n",
363 port->actor_port_number);
364 break;
365 case DUPLEX_HALF:
366 default:
367 retval = 0x0;
368 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n",
369 port->actor_port_number);
370 break;
371 }
372 }
373 return retval;
374}
375
376static void __ad_actor_update_port(struct port *port)
377{
378 const struct bonding *bond = bond_get_bond_by_slave(port->slave);
379
380 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
381 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
382}
383
384/* Conversions */
385
386/**
387 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
388 * @timer_type: which timer to operate
389 * @par: timer parameter. see below
390 *
391 * If @timer_type is %current_while_timer, @par indicates long/short timer.
392 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
393 * %SLOW_PERIODIC_TIME.
394 */
395static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
396{
397 u16 retval = 0; /* to silence the compiler */
398
399 switch (timer_type) {
400 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
401 if (par)
402 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
403 else
404 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
405 break;
406 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
407 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
408 break;
409 case AD_PERIODIC_TIMER: /* for periodic machine */
410 retval = (par*ad_ticks_per_sec); /* long timeout */
411 break;
412 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
413 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
414 break;
415 case AD_WAIT_WHILE_TIMER: /* for selection machine */
416 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
417 break;
418 }
419
420 return retval;
421}
422
423
424/* ================= ad_rx_machine helper functions ================== */
425
426/**
427 * __choose_matched - update a port's matched variable from a received lacpdu
428 * @lacpdu: the lacpdu we've received
429 * @port: the port we're looking at
430 *
431 * Update the value of the matched variable, using parameter values from a
432 * newly received lacpdu. Parameter values for the partner carried in the
433 * received PDU are compared with the corresponding operational parameter
434 * values for the actor. Matched is set to TRUE if all of these parameters
435 * match and the PDU parameter partner_state.aggregation has the same value as
436 * actor_oper_port_state.aggregation and lacp will actively maintain the link
437 * in the aggregation. Matched is also set to TRUE if the value of
438 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
439 * an individual link and lacp will actively maintain the link. Otherwise,
440 * matched is set to FALSE. LACP is considered to be actively maintaining the
441 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
442 * the actor's actor_oper_port_state.lacp_activity and the PDU's
443 * partner_state.lacp_activity variables are TRUE.
444 *
445 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
446 * used here to implement the language from 802.3ad 43.4.9 that requires
447 * recordPDU to "match" the LACPDU parameters to the stored values.
448 */
449static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
450{
451 /* check if all parameters are alike
452 * or this is individual link(aggregation == FALSE)
453 * then update the state machine Matched variable.
454 */
455 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
456 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
457 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
458 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
459 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
460 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
461 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
462 ) {
463 port->sm_vars |= AD_PORT_MATCHED;
464 } else {
465 port->sm_vars &= ~AD_PORT_MATCHED;
466 }
467}
468
469/**
470 * __record_pdu - record parameters from a received lacpdu
471 * @lacpdu: the lacpdu we've received
472 * @port: the port we're looking at
473 *
474 * Record the parameter values for the Actor carried in a received lacpdu as
475 * the current partner operational parameter values and sets
476 * actor_oper_port_state.defaulted to FALSE.
477 */
478static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
479{
480 if (lacpdu && port) {
481 struct port_params *partner = &port->partner_oper;
482
483 __choose_matched(lacpdu, port);
484 /* record the new parameter values for the partner
485 * operational
486 */
487 partner->port_number = ntohs(lacpdu->actor_port);
488 partner->port_priority = ntohs(lacpdu->actor_port_priority);
489 partner->system = lacpdu->actor_system;
490 partner->system_priority = ntohs(lacpdu->actor_system_priority);
491 partner->key = ntohs(lacpdu->actor_key);
492 partner->port_state = lacpdu->actor_state;
493
494 /* set actor_oper_port_state.defaulted to FALSE */
495 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
496
497 /* set the partner sync. to on if the partner is sync,
498 * and the port is matched
499 */
500 if ((port->sm_vars & AD_PORT_MATCHED) &&
501 (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
502 partner->port_state |= AD_STATE_SYNCHRONIZATION;
503 slave_dbg(port->slave->bond->dev, port->slave->dev,
504 "partner sync=1\n");
505 } else {
506 partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
507 slave_dbg(port->slave->bond->dev, port->slave->dev,
508 "partner sync=0\n");
509 }
510 }
511}
512
513/**
514 * __record_default - record default parameters
515 * @port: the port we're looking at
516 *
517 * This function records the default parameter values for the partner carried
518 * in the Partner Admin parameters as the current partner operational parameter
519 * values and sets actor_oper_port_state.defaulted to TRUE.
520 */
521static void __record_default(struct port *port)
522{
523 if (port) {
524 /* record the partner admin parameters */
525 memcpy(&port->partner_oper, &port->partner_admin,
526 sizeof(struct port_params));
527
528 /* set actor_oper_port_state.defaulted to true */
529 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
530 }
531}
532
533/**
534 * __update_selected - update a port's Selected variable from a received lacpdu
535 * @lacpdu: the lacpdu we've received
536 * @port: the port we're looking at
537 *
538 * Update the value of the selected variable, using parameter values from a
539 * newly received lacpdu. The parameter values for the Actor carried in the
540 * received PDU are compared with the corresponding operational parameter
541 * values for the ports partner. If one or more of the comparisons shows that
542 * the value(s) received in the PDU differ from the current operational values,
543 * then selected is set to FALSE and actor_oper_port_state.synchronization is
544 * set to out_of_sync. Otherwise, selected remains unchanged.
545 */
546static void __update_selected(struct lacpdu *lacpdu, struct port *port)
547{
548 if (lacpdu && port) {
549 const struct port_params *partner = &port->partner_oper;
550
551 /* check if any parameter is different then
552 * update the state machine selected variable.
553 */
554 if (ntohs(lacpdu->actor_port) != partner->port_number ||
555 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
556 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
557 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
558 ntohs(lacpdu->actor_key) != partner->key ||
559 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
560 port->sm_vars &= ~AD_PORT_SELECTED;
561 }
562 }
563}
564
565/**
566 * __update_default_selected - update a port's Selected variable from Partner
567 * @port: the port we're looking at
568 *
569 * This function updates the value of the selected variable, using the partner
570 * administrative parameter values. The administrative values are compared with
571 * the corresponding operational parameter values for the partner. If one or
572 * more of the comparisons shows that the administrative value(s) differ from
573 * the current operational values, then Selected is set to FALSE and
574 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
575 * Selected remains unchanged.
576 */
577static void __update_default_selected(struct port *port)
578{
579 if (port) {
580 const struct port_params *admin = &port->partner_admin;
581 const struct port_params *oper = &port->partner_oper;
582
583 /* check if any parameter is different then
584 * update the state machine selected variable.
585 */
586 if (admin->port_number != oper->port_number ||
587 admin->port_priority != oper->port_priority ||
588 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
589 admin->system_priority != oper->system_priority ||
590 admin->key != oper->key ||
591 (admin->port_state & AD_STATE_AGGREGATION)
592 != (oper->port_state & AD_STATE_AGGREGATION)) {
593 port->sm_vars &= ~AD_PORT_SELECTED;
594 }
595 }
596}
597
598/**
599 * __update_ntt - update a port's ntt variable from a received lacpdu
600 * @lacpdu: the lacpdu we've received
601 * @port: the port we're looking at
602 *
603 * Updates the value of the ntt variable, using parameter values from a newly
604 * received lacpdu. The parameter values for the partner carried in the
605 * received PDU are compared with the corresponding operational parameter
606 * values for the Actor. If one or more of the comparisons shows that the
607 * value(s) received in the PDU differ from the current operational values,
608 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
609 */
610static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
611{
612 /* validate lacpdu and port */
613 if (lacpdu && port) {
614 /* check if any parameter is different then
615 * update the port->ntt.
616 */
617 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
618 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
619 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
620 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
621 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
622 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
623 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
624 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
625 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
626 ) {
627 port->ntt = true;
628 }
629 }
630}
631
632/**
633 * __agg_ports_are_ready - check if all ports in an aggregator are ready
634 * @aggregator: the aggregator we're looking at
635 *
636 */
637static int __agg_ports_are_ready(struct aggregator *aggregator)
638{
639 struct port *port;
640 int retval = 1;
641
642 if (aggregator) {
643 /* scan all ports in this aggregator to verfy if they are
644 * all ready.
645 */
646 for (port = aggregator->lag_ports;
647 port;
648 port = port->next_port_in_aggregator) {
649 if (!(port->sm_vars & AD_PORT_READY_N)) {
650 retval = 0;
651 break;
652 }
653 }
654 }
655
656 return retval;
657}
658
659/**
660 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
661 * @aggregator: the aggregator we're looking at
662 * @val: Should the ports' ready bit be set on or off
663 *
664 */
665static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
666{
667 struct port *port;
668
669 for (port = aggregator->lag_ports; port;
670 port = port->next_port_in_aggregator) {
671 if (val)
672 port->sm_vars |= AD_PORT_READY;
673 else
674 port->sm_vars &= ~AD_PORT_READY;
675 }
676}
677
678static int __agg_active_ports(struct aggregator *agg)
679{
680 struct port *port;
681 int active = 0;
682
683 for (port = agg->lag_ports; port;
684 port = port->next_port_in_aggregator) {
685 if (port->is_enabled)
686 active++;
687 }
688
689 return active;
690}
691
692/**
693 * __get_agg_bandwidth - get the total bandwidth of an aggregator
694 * @aggregator: the aggregator we're looking at
695 *
696 */
697static u32 __get_agg_bandwidth(struct aggregator *aggregator)
698{
699 int nports = __agg_active_ports(aggregator);
700 u32 bandwidth = 0;
701
702 if (nports) {
703 switch (__get_link_speed(aggregator->lag_ports)) {
704 case AD_LINK_SPEED_1MBPS:
705 bandwidth = nports;
706 break;
707 case AD_LINK_SPEED_10MBPS:
708 bandwidth = nports * 10;
709 break;
710 case AD_LINK_SPEED_100MBPS:
711 bandwidth = nports * 100;
712 break;
713 case AD_LINK_SPEED_1000MBPS:
714 bandwidth = nports * 1000;
715 break;
716 case AD_LINK_SPEED_2500MBPS:
717 bandwidth = nports * 2500;
718 break;
719 case AD_LINK_SPEED_5000MBPS:
720 bandwidth = nports * 5000;
721 break;
722 case AD_LINK_SPEED_10000MBPS:
723 bandwidth = nports * 10000;
724 break;
725 case AD_LINK_SPEED_14000MBPS:
726 bandwidth = nports * 14000;
727 break;
728 case AD_LINK_SPEED_20000MBPS:
729 bandwidth = nports * 20000;
730 break;
731 case AD_LINK_SPEED_25000MBPS:
732 bandwidth = nports * 25000;
733 break;
734 case AD_LINK_SPEED_40000MBPS:
735 bandwidth = nports * 40000;
736 break;
737 case AD_LINK_SPEED_50000MBPS:
738 bandwidth = nports * 50000;
739 break;
740 case AD_LINK_SPEED_56000MBPS:
741 bandwidth = nports * 56000;
742 break;
743 case AD_LINK_SPEED_100000MBPS:
744 bandwidth = nports * 100000;
745 break;
746 default:
747 bandwidth = 0; /* to silence the compiler */
748 }
749 }
750 return bandwidth;
751}
752
753/**
754 * __get_active_agg - get the current active aggregator
755 * @aggregator: the aggregator we're looking at
756 *
757 * Caller must hold RCU lock.
758 */
759static struct aggregator *__get_active_agg(struct aggregator *aggregator)
760{
761 struct bonding *bond = aggregator->slave->bond;
762 struct list_head *iter;
763 struct slave *slave;
764
765 bond_for_each_slave_rcu(bond, slave, iter)
766 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
767 return &(SLAVE_AD_INFO(slave)->aggregator);
768
769 return NULL;
770}
771
772/**
773 * __update_lacpdu_from_port - update a port's lacpdu fields
774 * @port: the port we're looking at
775 */
776static inline void __update_lacpdu_from_port(struct port *port)
777{
778 struct lacpdu *lacpdu = &port->lacpdu;
779 const struct port_params *partner = &port->partner_oper;
780
781 /* update current actual Actor parameters
782 * lacpdu->subtype initialized
783 * lacpdu->version_number initialized
784 * lacpdu->tlv_type_actor_info initialized
785 * lacpdu->actor_information_length initialized
786 */
787
788 lacpdu->actor_system_priority = htons(port->actor_system_priority);
789 lacpdu->actor_system = port->actor_system;
790 lacpdu->actor_key = htons(port->actor_oper_port_key);
791 lacpdu->actor_port_priority = htons(port->actor_port_priority);
792 lacpdu->actor_port = htons(port->actor_port_number);
793 lacpdu->actor_state = port->actor_oper_port_state;
794 slave_dbg(port->slave->bond->dev, port->slave->dev,
795 "update lacpdu: actor port state %x\n",
796 port->actor_oper_port_state);
797
798 /* lacpdu->reserved_3_1 initialized
799 * lacpdu->tlv_type_partner_info initialized
800 * lacpdu->partner_information_length initialized
801 */
802
803 lacpdu->partner_system_priority = htons(partner->system_priority);
804 lacpdu->partner_system = partner->system;
805 lacpdu->partner_key = htons(partner->key);
806 lacpdu->partner_port_priority = htons(partner->port_priority);
807 lacpdu->partner_port = htons(partner->port_number);
808 lacpdu->partner_state = partner->port_state;
809
810 /* lacpdu->reserved_3_2 initialized
811 * lacpdu->tlv_type_collector_info initialized
812 * lacpdu->collector_information_length initialized
813 * collector_max_delay initialized
814 * reserved_12[12] initialized
815 * tlv_type_terminator initialized
816 * terminator_length initialized
817 * reserved_50[50] initialized
818 */
819}
820
821/* ================= main 802.3ad protocol code ========================= */
822
823/**
824 * ad_lacpdu_send - send out a lacpdu packet on a given port
825 * @port: the port we're looking at
826 *
827 * Returns: 0 on success
828 * < 0 on error
829 */
830static int ad_lacpdu_send(struct port *port)
831{
832 struct slave *slave = port->slave;
833 struct sk_buff *skb;
834 struct lacpdu_header *lacpdu_header;
835 int length = sizeof(struct lacpdu_header);
836
837 skb = dev_alloc_skb(length);
838 if (!skb)
839 return -ENOMEM;
840
841 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx);
842 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx);
843
844 skb->dev = slave->dev;
845 skb_reset_mac_header(skb);
846 skb->network_header = skb->mac_header + ETH_HLEN;
847 skb->protocol = PKT_TYPE_LACPDU;
848 skb->priority = TC_PRIO_CONTROL;
849
850 lacpdu_header = skb_put(skb, length);
851
852 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
853 /* Note: source address is set to be the member's PERMANENT address,
854 * because we use it to identify loopback lacpdus in receive.
855 */
856 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
857 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
858
859 lacpdu_header->lacpdu = port->lacpdu;
860
861 dev_queue_xmit(skb);
862
863 return 0;
864}
865
866/**
867 * ad_marker_send - send marker information/response on a given port
868 * @port: the port we're looking at
869 * @marker: marker data to send
870 *
871 * Returns: 0 on success
872 * < 0 on error
873 */
874static int ad_marker_send(struct port *port, struct bond_marker *marker)
875{
876 struct slave *slave = port->slave;
877 struct sk_buff *skb;
878 struct bond_marker_header *marker_header;
879 int length = sizeof(struct bond_marker_header);
880
881 skb = dev_alloc_skb(length + 16);
882 if (!skb)
883 return -ENOMEM;
884
885 switch (marker->tlv_type) {
886 case AD_MARKER_INFORMATION_SUBTYPE:
887 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx);
888 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx);
889 break;
890 case AD_MARKER_RESPONSE_SUBTYPE:
891 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx);
892 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx);
893 break;
894 }
895
896 skb_reserve(skb, 16);
897
898 skb->dev = slave->dev;
899 skb_reset_mac_header(skb);
900 skb->network_header = skb->mac_header + ETH_HLEN;
901 skb->protocol = PKT_TYPE_LACPDU;
902
903 marker_header = skb_put(skb, length);
904
905 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
906 /* Note: source address is set to be the member's PERMANENT address,
907 * because we use it to identify loopback MARKERs in receive.
908 */
909 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
910 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
911
912 marker_header->marker = *marker;
913
914 dev_queue_xmit(skb);
915
916 return 0;
917}
918
919/**
920 * ad_mux_machine - handle a port's mux state machine
921 * @port: the port we're looking at
922 * @update_slave_arr: Does slave array need update?
923 */
924static void ad_mux_machine(struct port *port, bool *update_slave_arr)
925{
926 mux_states_t last_state;
927
928 /* keep current State Machine state to compare later if it was
929 * changed
930 */
931 last_state = port->sm_mux_state;
932
933 if (port->sm_vars & AD_PORT_BEGIN) {
934 port->sm_mux_state = AD_MUX_DETACHED;
935 } else {
936 switch (port->sm_mux_state) {
937 case AD_MUX_DETACHED:
938 if ((port->sm_vars & AD_PORT_SELECTED)
939 || (port->sm_vars & AD_PORT_STANDBY))
940 /* if SELECTED or STANDBY */
941 port->sm_mux_state = AD_MUX_WAITING;
942 break;
943 case AD_MUX_WAITING:
944 /* if SELECTED == FALSE return to DETACH state */
945 if (!(port->sm_vars & AD_PORT_SELECTED)) {
946 port->sm_vars &= ~AD_PORT_READY_N;
947 /* in order to withhold the Selection Logic to
948 * check all ports READY_N value every callback
949 * cycle to update ready variable, we check
950 * READY_N and update READY here
951 */
952 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
953 port->sm_mux_state = AD_MUX_DETACHED;
954 break;
955 }
956
957 /* check if the wait_while_timer expired */
958 if (port->sm_mux_timer_counter
959 && !(--port->sm_mux_timer_counter))
960 port->sm_vars |= AD_PORT_READY_N;
961
962 /* in order to withhold the selection logic to check
963 * all ports READY_N value every callback cycle to
964 * update ready variable, we check READY_N and update
965 * READY here
966 */
967 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
968
969 /* if the wait_while_timer expired, and the port is
970 * in READY state, move to ATTACHED state
971 */
972 if ((port->sm_vars & AD_PORT_READY)
973 && !port->sm_mux_timer_counter)
974 port->sm_mux_state = AD_MUX_ATTACHED;
975 break;
976 case AD_MUX_ATTACHED:
977 /* check also if agg_select_timer expired (so the
978 * edable port will take place only after this timer)
979 */
980 if ((port->sm_vars & AD_PORT_SELECTED) &&
981 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
982 !__check_agg_selection_timer(port)) {
983 if (port->aggregator->is_active)
984 port->sm_mux_state =
985 AD_MUX_COLLECTING_DISTRIBUTING;
986 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
987 (port->sm_vars & AD_PORT_STANDBY)) {
988 /* if UNSELECTED or STANDBY */
989 port->sm_vars &= ~AD_PORT_READY_N;
990 /* in order to withhold the selection logic to
991 * check all ports READY_N value every callback
992 * cycle to update ready variable, we check
993 * READY_N and update READY here
994 */
995 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
996 port->sm_mux_state = AD_MUX_DETACHED;
997 } else if (port->aggregator->is_active) {
998 port->actor_oper_port_state |=
999 AD_STATE_SYNCHRONIZATION;
1000 }
1001 break;
1002 case AD_MUX_COLLECTING_DISTRIBUTING:
1003 if (!(port->sm_vars & AD_PORT_SELECTED) ||
1004 (port->sm_vars & AD_PORT_STANDBY) ||
1005 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
1006 !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
1007 port->sm_mux_state = AD_MUX_ATTACHED;
1008 } else {
1009 /* if port state hasn't changed make
1010 * sure that a collecting distributing
1011 * port in an active aggregator is enabled
1012 */
1013 if (port->aggregator &&
1014 port->aggregator->is_active &&
1015 !__port_is_enabled(port)) {
1016
1017 __enable_port(port);
1018 }
1019 }
1020 break;
1021 default:
1022 break;
1023 }
1024 }
1025
1026 /* check if the state machine was changed */
1027 if (port->sm_mux_state != last_state) {
1028 slave_dbg(port->slave->bond->dev, port->slave->dev,
1029 "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
1030 port->actor_port_number,
1031 last_state,
1032 port->sm_mux_state);
1033 switch (port->sm_mux_state) {
1034 case AD_MUX_DETACHED:
1035 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1036 ad_disable_collecting_distributing(port,
1037 update_slave_arr);
1038 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1039 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1040 port->ntt = true;
1041 break;
1042 case AD_MUX_WAITING:
1043 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1044 break;
1045 case AD_MUX_ATTACHED:
1046 if (port->aggregator->is_active)
1047 port->actor_oper_port_state |=
1048 AD_STATE_SYNCHRONIZATION;
1049 else
1050 port->actor_oper_port_state &=
1051 ~AD_STATE_SYNCHRONIZATION;
1052 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1053 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1054 ad_disable_collecting_distributing(port,
1055 update_slave_arr);
1056 port->ntt = true;
1057 break;
1058 case AD_MUX_COLLECTING_DISTRIBUTING:
1059 port->actor_oper_port_state |= AD_STATE_COLLECTING;
1060 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1061 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1062 ad_enable_collecting_distributing(port,
1063 update_slave_arr);
1064 port->ntt = true;
1065 break;
1066 default:
1067 break;
1068 }
1069 }
1070}
1071
1072/**
1073 * ad_rx_machine - handle a port's rx State Machine
1074 * @lacpdu: the lacpdu we've received
1075 * @port: the port we're looking at
1076 *
1077 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1078 * CURRENT. If timer expired set the state machine in the proper state.
1079 * In other cases, this function checks if we need to switch to other state.
1080 */
1081static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1082{
1083 rx_states_t last_state;
1084
1085 /* keep current State Machine state to compare later if it was
1086 * changed
1087 */
1088 last_state = port->sm_rx_state;
1089
1090 if (lacpdu) {
1091 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx);
1092 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx);
1093 }
1094 /* check if state machine should change state */
1095
1096 /* first, check if port was reinitialized */
1097 if (port->sm_vars & AD_PORT_BEGIN) {
1098 port->sm_rx_state = AD_RX_INITIALIZE;
1099 port->sm_vars |= AD_PORT_CHURNED;
1100 /* check if port is not enabled */
1101 } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1102 port->sm_rx_state = AD_RX_PORT_DISABLED;
1103 /* check if new lacpdu arrived */
1104 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1105 (port->sm_rx_state == AD_RX_DEFAULTED) ||
1106 (port->sm_rx_state == AD_RX_CURRENT))) {
1107 if (port->sm_rx_state != AD_RX_CURRENT)
1108 port->sm_vars |= AD_PORT_CHURNED;
1109 port->sm_rx_timer_counter = 0;
1110 port->sm_rx_state = AD_RX_CURRENT;
1111 } else {
1112 /* if timer is on, and if it is expired */
1113 if (port->sm_rx_timer_counter &&
1114 !(--port->sm_rx_timer_counter)) {
1115 switch (port->sm_rx_state) {
1116 case AD_RX_EXPIRED:
1117 port->sm_rx_state = AD_RX_DEFAULTED;
1118 break;
1119 case AD_RX_CURRENT:
1120 port->sm_rx_state = AD_RX_EXPIRED;
1121 break;
1122 default:
1123 break;
1124 }
1125 } else {
1126 /* if no lacpdu arrived and no timer is on */
1127 switch (port->sm_rx_state) {
1128 case AD_RX_PORT_DISABLED:
1129 if (port->is_enabled &&
1130 (port->sm_vars & AD_PORT_LACP_ENABLED))
1131 port->sm_rx_state = AD_RX_EXPIRED;
1132 else if (port->is_enabled
1133 && ((port->sm_vars
1134 & AD_PORT_LACP_ENABLED) == 0))
1135 port->sm_rx_state = AD_RX_LACP_DISABLED;
1136 break;
1137 default:
1138 break;
1139
1140 }
1141 }
1142 }
1143
1144 /* check if the State machine was changed or new lacpdu arrived */
1145 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1146 slave_dbg(port->slave->bond->dev, port->slave->dev,
1147 "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1148 port->actor_port_number,
1149 last_state,
1150 port->sm_rx_state);
1151 switch (port->sm_rx_state) {
1152 case AD_RX_INITIALIZE:
1153 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1154 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1155 else
1156 port->sm_vars |= AD_PORT_LACP_ENABLED;
1157 port->sm_vars &= ~AD_PORT_SELECTED;
1158 __record_default(port);
1159 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1160 port->sm_rx_state = AD_RX_PORT_DISABLED;
1161
1162 /* Fall Through */
1163 case AD_RX_PORT_DISABLED:
1164 port->sm_vars &= ~AD_PORT_MATCHED;
1165 break;
1166 case AD_RX_LACP_DISABLED:
1167 port->sm_vars &= ~AD_PORT_SELECTED;
1168 __record_default(port);
1169 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1170 port->sm_vars |= AD_PORT_MATCHED;
1171 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1172 break;
1173 case AD_RX_EXPIRED:
1174 /* Reset of the Synchronization flag (Standard 43.4.12)
1175 * This reset cause to disable this port in the
1176 * COLLECTING_DISTRIBUTING state of the mux machine in
1177 * case of EXPIRED even if LINK_DOWN didn't arrive for
1178 * the port.
1179 */
1180 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1181 port->sm_vars &= ~AD_PORT_MATCHED;
1182 port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1183 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1184 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1185 port->actor_oper_port_state |= AD_STATE_EXPIRED;
1186 port->sm_vars |= AD_PORT_CHURNED;
1187 break;
1188 case AD_RX_DEFAULTED:
1189 __update_default_selected(port);
1190 __record_default(port);
1191 port->sm_vars |= AD_PORT_MATCHED;
1192 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1193 break;
1194 case AD_RX_CURRENT:
1195 /* detect loopback situation */
1196 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1197 &(port->actor_system))) {
1198 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n"
1199 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n");
1200 return;
1201 }
1202 __update_selected(lacpdu, port);
1203 __update_ntt(lacpdu, port);
1204 __record_pdu(lacpdu, port);
1205 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1206 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1207 break;
1208 default:
1209 break;
1210 }
1211 }
1212}
1213
1214/**
1215 * ad_churn_machine - handle port churn's state machine
1216 * @port: the port we're looking at
1217 *
1218 */
1219static void ad_churn_machine(struct port *port)
1220{
1221 if (port->sm_vars & AD_PORT_CHURNED) {
1222 port->sm_vars &= ~AD_PORT_CHURNED;
1223 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1224 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1225 port->sm_churn_actor_timer_counter =
1226 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1227 port->sm_churn_partner_timer_counter =
1228 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1229 return;
1230 }
1231 if (port->sm_churn_actor_timer_counter &&
1232 !(--port->sm_churn_actor_timer_counter) &&
1233 port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1234 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1235 port->sm_churn_actor_state = AD_NO_CHURN;
1236 } else {
1237 port->churn_actor_count++;
1238 port->sm_churn_actor_state = AD_CHURN;
1239 }
1240 }
1241 if (port->sm_churn_partner_timer_counter &&
1242 !(--port->sm_churn_partner_timer_counter) &&
1243 port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1244 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1245 port->sm_churn_partner_state = AD_NO_CHURN;
1246 } else {
1247 port->churn_partner_count++;
1248 port->sm_churn_partner_state = AD_CHURN;
1249 }
1250 }
1251}
1252
1253/**
1254 * ad_tx_machine - handle a port's tx state machine
1255 * @port: the port we're looking at
1256 */
1257static void ad_tx_machine(struct port *port)
1258{
1259 /* check if tx timer expired, to verify that we do not send more than
1260 * 3 packets per second
1261 */
1262 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1263 /* check if there is something to send */
1264 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1265 __update_lacpdu_from_port(port);
1266
1267 if (ad_lacpdu_send(port) >= 0) {
1268 slave_dbg(port->slave->bond->dev,
1269 port->slave->dev,
1270 "Sent LACPDU on port %d\n",
1271 port->actor_port_number);
1272
1273 /* mark ntt as false, so it will not be sent
1274 * again until demanded
1275 */
1276 port->ntt = false;
1277 }
1278 }
1279 /* restart tx timer(to verify that we will not exceed
1280 * AD_MAX_TX_IN_SECOND
1281 */
1282 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1283 }
1284}
1285
1286/**
1287 * ad_periodic_machine - handle a port's periodic state machine
1288 * @port: the port we're looking at
1289 *
1290 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1291 */
1292static void ad_periodic_machine(struct port *port)
1293{
1294 periodic_states_t last_state;
1295
1296 /* keep current state machine state to compare later if it was changed */
1297 last_state = port->sm_periodic_state;
1298
1299 /* check if port was reinitialized */
1300 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1301 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1302 ) {
1303 port->sm_periodic_state = AD_NO_PERIODIC;
1304 }
1305 /* check if state machine should change state */
1306 else if (port->sm_periodic_timer_counter) {
1307 /* check if periodic state machine expired */
1308 if (!(--port->sm_periodic_timer_counter)) {
1309 /* if expired then do tx */
1310 port->sm_periodic_state = AD_PERIODIC_TX;
1311 } else {
1312 /* If not expired, check if there is some new timeout
1313 * parameter from the partner state
1314 */
1315 switch (port->sm_periodic_state) {
1316 case AD_FAST_PERIODIC:
1317 if (!(port->partner_oper.port_state
1318 & AD_STATE_LACP_TIMEOUT))
1319 port->sm_periodic_state = AD_SLOW_PERIODIC;
1320 break;
1321 case AD_SLOW_PERIODIC:
1322 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1323 port->sm_periodic_timer_counter = 0;
1324 port->sm_periodic_state = AD_PERIODIC_TX;
1325 }
1326 break;
1327 default:
1328 break;
1329 }
1330 }
1331 } else {
1332 switch (port->sm_periodic_state) {
1333 case AD_NO_PERIODIC:
1334 port->sm_periodic_state = AD_FAST_PERIODIC;
1335 break;
1336 case AD_PERIODIC_TX:
1337 if (!(port->partner_oper.port_state &
1338 AD_STATE_LACP_TIMEOUT))
1339 port->sm_periodic_state = AD_SLOW_PERIODIC;
1340 else
1341 port->sm_periodic_state = AD_FAST_PERIODIC;
1342 break;
1343 default:
1344 break;
1345 }
1346 }
1347
1348 /* check if the state machine was changed */
1349 if (port->sm_periodic_state != last_state) {
1350 slave_dbg(port->slave->bond->dev, port->slave->dev,
1351 "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1352 port->actor_port_number, last_state,
1353 port->sm_periodic_state);
1354 switch (port->sm_periodic_state) {
1355 case AD_NO_PERIODIC:
1356 port->sm_periodic_timer_counter = 0;
1357 break;
1358 case AD_FAST_PERIODIC:
1359 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1360 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1361 break;
1362 case AD_SLOW_PERIODIC:
1363 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1364 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1365 break;
1366 case AD_PERIODIC_TX:
1367 port->ntt = true;
1368 break;
1369 default:
1370 break;
1371 }
1372 }
1373}
1374
1375/**
1376 * ad_port_selection_logic - select aggregation groups
1377 * @port: the port we're looking at
1378 * @update_slave_arr: Does slave array need update?
1379 *
1380 * Select aggregation groups, and assign each port for it's aggregetor. The
1381 * selection logic is called in the inititalization (after all the handshkes),
1382 * and after every lacpdu receive (if selected is off).
1383 */
1384static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1385{
1386 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1387 struct port *last_port = NULL, *curr_port;
1388 struct list_head *iter;
1389 struct bonding *bond;
1390 struct slave *slave;
1391 int found = 0;
1392
1393 /* if the port is already Selected, do nothing */
1394 if (port->sm_vars & AD_PORT_SELECTED)
1395 return;
1396
1397 bond = __get_bond_by_port(port);
1398
1399 /* if the port is connected to other aggregator, detach it */
1400 if (port->aggregator) {
1401 /* detach the port from its former aggregator */
1402 temp_aggregator = port->aggregator;
1403 for (curr_port = temp_aggregator->lag_ports; curr_port;
1404 last_port = curr_port,
1405 curr_port = curr_port->next_port_in_aggregator) {
1406 if (curr_port == port) {
1407 temp_aggregator->num_of_ports--;
1408 /* if it is the first port attached to the
1409 * aggregator
1410 */
1411 if (!last_port) {
1412 temp_aggregator->lag_ports =
1413 port->next_port_in_aggregator;
1414 } else {
1415 /* not the first port attached to the
1416 * aggregator
1417 */
1418 last_port->next_port_in_aggregator =
1419 port->next_port_in_aggregator;
1420 }
1421
1422 /* clear the port's relations to this
1423 * aggregator
1424 */
1425 port->aggregator = NULL;
1426 port->next_port_in_aggregator = NULL;
1427 port->actor_port_aggregator_identifier = 0;
1428
1429 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n",
1430 port->actor_port_number,
1431 temp_aggregator->aggregator_identifier);
1432 /* if the aggregator is empty, clear its
1433 * parameters, and set it ready to be attached
1434 */
1435 if (!temp_aggregator->lag_ports)
1436 ad_clear_agg(temp_aggregator);
1437 break;
1438 }
1439 }
1440 if (!curr_port) {
1441 /* meaning: the port was related to an aggregator
1442 * but was not on the aggregator port list
1443 */
1444 net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n",
1445 port->slave->bond->dev->name,
1446 port->slave->dev->name,
1447 port->actor_port_number,
1448 port->aggregator->aggregator_identifier);
1449 }
1450 }
1451 /* search on all aggregators for a suitable aggregator for this port */
1452 bond_for_each_slave(bond, slave, iter) {
1453 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1454
1455 /* keep a free aggregator for later use(if needed) */
1456 if (!aggregator->lag_ports) {
1457 if (!free_aggregator)
1458 free_aggregator = aggregator;
1459 continue;
1460 }
1461 /* check if current aggregator suits us */
1462 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1463 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1464 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1465 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1466 ) &&
1467 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1468 !aggregator->is_individual) /* but is not individual OR */
1469 )
1470 ) {
1471 /* attach to the founded aggregator */
1472 port->aggregator = aggregator;
1473 port->actor_port_aggregator_identifier =
1474 port->aggregator->aggregator_identifier;
1475 port->next_port_in_aggregator = aggregator->lag_ports;
1476 port->aggregator->num_of_ports++;
1477 aggregator->lag_ports = port;
1478 slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n",
1479 port->actor_port_number,
1480 port->aggregator->aggregator_identifier);
1481
1482 /* mark this port as selected */
1483 port->sm_vars |= AD_PORT_SELECTED;
1484 found = 1;
1485 break;
1486 }
1487 }
1488
1489 /* the port couldn't find an aggregator - attach it to a new
1490 * aggregator
1491 */
1492 if (!found) {
1493 if (free_aggregator) {
1494 /* assign port a new aggregator */
1495 port->aggregator = free_aggregator;
1496 port->actor_port_aggregator_identifier =
1497 port->aggregator->aggregator_identifier;
1498
1499 /* update the new aggregator's parameters
1500 * if port was responsed from the end-user
1501 */
1502 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1503 /* if port is full duplex */
1504 port->aggregator->is_individual = false;
1505 else
1506 port->aggregator->is_individual = true;
1507
1508 port->aggregator->actor_admin_aggregator_key =
1509 port->actor_admin_port_key;
1510 port->aggregator->actor_oper_aggregator_key =
1511 port->actor_oper_port_key;
1512 port->aggregator->partner_system =
1513 port->partner_oper.system;
1514 port->aggregator->partner_system_priority =
1515 port->partner_oper.system_priority;
1516 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1517 port->aggregator->receive_state = 1;
1518 port->aggregator->transmit_state = 1;
1519 port->aggregator->lag_ports = port;
1520 port->aggregator->num_of_ports++;
1521
1522 /* mark this port as selected */
1523 port->sm_vars |= AD_PORT_SELECTED;
1524
1525 slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n",
1526 port->actor_port_number,
1527 port->aggregator->aggregator_identifier);
1528 } else {
1529 slave_err(bond->dev, port->slave->dev,
1530 "Port %d did not find a suitable aggregator\n",
1531 port->actor_port_number);
1532 }
1533 }
1534 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1535 * in all aggregator's ports, else set ready=FALSE in all
1536 * aggregator's ports
1537 */
1538 __set_agg_ports_ready(port->aggregator,
1539 __agg_ports_are_ready(port->aggregator));
1540
1541 aggregator = __get_first_agg(port);
1542 ad_agg_selection_logic(aggregator, update_slave_arr);
1543
1544 if (!port->aggregator->is_active)
1545 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1546}
1547
1548/* Decide if "agg" is a better choice for the new active aggregator that
1549 * the current best, according to the ad_select policy.
1550 */
1551static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1552 struct aggregator *curr)
1553{
1554 /* 0. If no best, select current.
1555 *
1556 * 1. If the current agg is not individual, and the best is
1557 * individual, select current.
1558 *
1559 * 2. If current agg is individual and the best is not, keep best.
1560 *
1561 * 3. Therefore, current and best are both individual or both not
1562 * individual, so:
1563 *
1564 * 3a. If current agg partner replied, and best agg partner did not,
1565 * select current.
1566 *
1567 * 3b. If current agg partner did not reply and best agg partner
1568 * did reply, keep best.
1569 *
1570 * 4. Therefore, current and best both have partner replies or
1571 * both do not, so perform selection policy:
1572 *
1573 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1574 * select by bandwidth.
1575 *
1576 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1577 */
1578 if (!best)
1579 return curr;
1580
1581 if (!curr->is_individual && best->is_individual)
1582 return curr;
1583
1584 if (curr->is_individual && !best->is_individual)
1585 return best;
1586
1587 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1588 return curr;
1589
1590 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1591 return best;
1592
1593 switch (__get_agg_selection_mode(curr->lag_ports)) {
1594 case BOND_AD_COUNT:
1595 if (__agg_active_ports(curr) > __agg_active_ports(best))
1596 return curr;
1597
1598 if (__agg_active_ports(curr) < __agg_active_ports(best))
1599 return best;
1600
1601 /*FALLTHROUGH*/
1602 case BOND_AD_STABLE:
1603 case BOND_AD_BANDWIDTH:
1604 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1605 return curr;
1606
1607 break;
1608
1609 default:
1610 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n",
1611 curr->slave->bond->dev->name,
1612 curr->slave->dev->name,
1613 __get_agg_selection_mode(curr->lag_ports));
1614 break;
1615 }
1616
1617 return best;
1618}
1619
1620static int agg_device_up(const struct aggregator *agg)
1621{
1622 struct port *port = agg->lag_ports;
1623
1624 if (!port)
1625 return 0;
1626
1627 for (port = agg->lag_ports; port;
1628 port = port->next_port_in_aggregator) {
1629 if (netif_running(port->slave->dev) &&
1630 netif_carrier_ok(port->slave->dev))
1631 return 1;
1632 }
1633
1634 return 0;
1635}
1636
1637/**
1638 * ad_agg_selection_logic - select an aggregation group for a team
1639 * @aggregator: the aggregator we're looking at
1640 * @update_slave_arr: Does slave array need update?
1641 *
1642 * It is assumed that only one aggregator may be selected for a team.
1643 *
1644 * The logic of this function is to select the aggregator according to
1645 * the ad_select policy:
1646 *
1647 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1648 * it, and to reselect the active aggregator only if the previous
1649 * aggregator has no more ports related to it.
1650 *
1651 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1652 * bandwidth, and reselect whenever a link state change takes place or the
1653 * set of slaves in the bond changes.
1654 *
1655 * BOND_AD_COUNT: select the aggregator with largest number of ports
1656 * (slaves), and reselect whenever a link state change takes place or the
1657 * set of slaves in the bond changes.
1658 *
1659 * FIXME: this function MUST be called with the first agg in the bond, or
1660 * __get_active_agg() won't work correctly. This function should be better
1661 * called with the bond itself, and retrieve the first agg from it.
1662 */
1663static void ad_agg_selection_logic(struct aggregator *agg,
1664 bool *update_slave_arr)
1665{
1666 struct aggregator *best, *active, *origin;
1667 struct bonding *bond = agg->slave->bond;
1668 struct list_head *iter;
1669 struct slave *slave;
1670 struct port *port;
1671
1672 rcu_read_lock();
1673 origin = agg;
1674 active = __get_active_agg(agg);
1675 best = (active && agg_device_up(active)) ? active : NULL;
1676
1677 bond_for_each_slave_rcu(bond, slave, iter) {
1678 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1679
1680 agg->is_active = 0;
1681
1682 if (__agg_active_ports(agg) && agg_device_up(agg))
1683 best = ad_agg_selection_test(best, agg);
1684 }
1685
1686 if (best &&
1687 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1688 /* For the STABLE policy, don't replace the old active
1689 * aggregator if it's still active (it has an answering
1690 * partner) or if both the best and active don't have an
1691 * answering partner.
1692 */
1693 if (active && active->lag_ports &&
1694 __agg_active_ports(active) &&
1695 (__agg_has_partner(active) ||
1696 (!__agg_has_partner(active) &&
1697 !__agg_has_partner(best)))) {
1698 if (!(!active->actor_oper_aggregator_key &&
1699 best->actor_oper_aggregator_key)) {
1700 best = NULL;
1701 active->is_active = 1;
1702 }
1703 }
1704 }
1705
1706 if (best && (best == active)) {
1707 best = NULL;
1708 active->is_active = 1;
1709 }
1710
1711 /* if there is new best aggregator, activate it */
1712 if (best) {
1713 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1714 best->slave ? best->slave->dev->name : "NULL",
1715 best->aggregator_identifier, best->num_of_ports,
1716 best->actor_oper_aggregator_key,
1717 best->partner_oper_aggregator_key,
1718 best->is_individual, best->is_active);
1719 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n",
1720 best->slave ? best->slave->dev->name : "NULL",
1721 best->lag_ports, best->slave);
1722
1723 bond_for_each_slave_rcu(bond, slave, iter) {
1724 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1725
1726 slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1727 agg->aggregator_identifier, agg->num_of_ports,
1728 agg->actor_oper_aggregator_key,
1729 agg->partner_oper_aggregator_key,
1730 agg->is_individual, agg->is_active);
1731 }
1732
1733 /* check if any partner replies */
1734 if (best->is_individual)
1735 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1736 bond->dev->name);
1737
1738 best->is_active = 1;
1739 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n",
1740 best->slave ? best->slave->dev->name : "NULL",
1741 best->aggregator_identifier);
1742 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1743 best->slave ? best->slave->dev->name : "NULL",
1744 best->aggregator_identifier, best->num_of_ports,
1745 best->actor_oper_aggregator_key,
1746 best->partner_oper_aggregator_key,
1747 best->is_individual, best->is_active);
1748
1749 /* disable the ports that were related to the former
1750 * active_aggregator
1751 */
1752 if (active) {
1753 for (port = active->lag_ports; port;
1754 port = port->next_port_in_aggregator) {
1755 __disable_port(port);
1756 }
1757 }
1758 /* Slave array needs update. */
1759 *update_slave_arr = true;
1760 }
1761
1762 /* if the selected aggregator is of join individuals
1763 * (partner_system is NULL), enable their ports
1764 */
1765 active = __get_active_agg(origin);
1766
1767 if (active) {
1768 if (!__agg_has_partner(active)) {
1769 for (port = active->lag_ports; port;
1770 port = port->next_port_in_aggregator) {
1771 __enable_port(port);
1772 }
1773 }
1774 }
1775
1776 rcu_read_unlock();
1777
1778 bond_3ad_set_carrier(bond);
1779}
1780
1781/**
1782 * ad_clear_agg - clear a given aggregator's parameters
1783 * @aggregator: the aggregator we're looking at
1784 */
1785static void ad_clear_agg(struct aggregator *aggregator)
1786{
1787 if (aggregator) {
1788 aggregator->is_individual = false;
1789 aggregator->actor_admin_aggregator_key = 0;
1790 aggregator->actor_oper_aggregator_key = 0;
1791 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1792 aggregator->partner_system_priority = 0;
1793 aggregator->partner_oper_aggregator_key = 0;
1794 aggregator->receive_state = 0;
1795 aggregator->transmit_state = 0;
1796 aggregator->lag_ports = NULL;
1797 aggregator->is_active = 0;
1798 aggregator->num_of_ports = 0;
1799 pr_debug("%s: LAG %d was cleared\n",
1800 aggregator->slave ?
1801 aggregator->slave->dev->name : "NULL",
1802 aggregator->aggregator_identifier);
1803 }
1804}
1805
1806/**
1807 * ad_initialize_agg - initialize a given aggregator's parameters
1808 * @aggregator: the aggregator we're looking at
1809 */
1810static void ad_initialize_agg(struct aggregator *aggregator)
1811{
1812 if (aggregator) {
1813 ad_clear_agg(aggregator);
1814
1815 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1816 aggregator->aggregator_identifier = 0;
1817 aggregator->slave = NULL;
1818 }
1819}
1820
1821/**
1822 * ad_initialize_port - initialize a given port's parameters
1823 * @aggregator: the aggregator we're looking at
1824 * @lacp_fast: boolean. whether fast periodic should be used
1825 */
1826static void ad_initialize_port(struct port *port, int lacp_fast)
1827{
1828 static const struct port_params tmpl = {
1829 .system_priority = 0xffff,
1830 .key = 1,
1831 .port_number = 1,
1832 .port_priority = 0xff,
1833 .port_state = 1,
1834 };
1835 static const struct lacpdu lacpdu = {
1836 .subtype = 0x01,
1837 .version_number = 0x01,
1838 .tlv_type_actor_info = 0x01,
1839 .actor_information_length = 0x14,
1840 .tlv_type_partner_info = 0x02,
1841 .partner_information_length = 0x14,
1842 .tlv_type_collector_info = 0x03,
1843 .collector_information_length = 0x10,
1844 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1845 };
1846
1847 if (port) {
1848 port->actor_port_priority = 0xff;
1849 port->actor_port_aggregator_identifier = 0;
1850 port->ntt = false;
1851 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1852 AD_STATE_LACP_ACTIVITY;
1853 port->actor_oper_port_state = AD_STATE_AGGREGATION |
1854 AD_STATE_LACP_ACTIVITY;
1855
1856 if (lacp_fast)
1857 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1858
1859 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1860 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1861
1862 port->is_enabled = true;
1863 /* private parameters */
1864 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1865 port->sm_rx_state = 0;
1866 port->sm_rx_timer_counter = 0;
1867 port->sm_periodic_state = 0;
1868 port->sm_periodic_timer_counter = 0;
1869 port->sm_mux_state = 0;
1870 port->sm_mux_timer_counter = 0;
1871 port->sm_tx_state = 0;
1872 port->aggregator = NULL;
1873 port->next_port_in_aggregator = NULL;
1874 port->transaction_id = 0;
1875
1876 port->sm_churn_actor_timer_counter = 0;
1877 port->sm_churn_actor_state = 0;
1878 port->churn_actor_count = 0;
1879 port->sm_churn_partner_timer_counter = 0;
1880 port->sm_churn_partner_state = 0;
1881 port->churn_partner_count = 0;
1882
1883 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1884 }
1885}
1886
1887/**
1888 * ad_enable_collecting_distributing - enable a port's transmit/receive
1889 * @port: the port we're looking at
1890 * @update_slave_arr: Does slave array need update?
1891 *
1892 * Enable @port if it's in an active aggregator
1893 */
1894static void ad_enable_collecting_distributing(struct port *port,
1895 bool *update_slave_arr)
1896{
1897 if (port->aggregator->is_active) {
1898 slave_dbg(port->slave->bond->dev, port->slave->dev,
1899 "Enabling port %d (LAG %d)\n",
1900 port->actor_port_number,
1901 port->aggregator->aggregator_identifier);
1902 __enable_port(port);
1903 /* Slave array needs update */
1904 *update_slave_arr = true;
1905 }
1906}
1907
1908/**
1909 * ad_disable_collecting_distributing - disable a port's transmit/receive
1910 * @port: the port we're looking at
1911 * @update_slave_arr: Does slave array need update?
1912 */
1913static void ad_disable_collecting_distributing(struct port *port,
1914 bool *update_slave_arr)
1915{
1916 if (port->aggregator &&
1917 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1918 &(null_mac_addr))) {
1919 slave_dbg(port->slave->bond->dev, port->slave->dev,
1920 "Disabling port %d (LAG %d)\n",
1921 port->actor_port_number,
1922 port->aggregator->aggregator_identifier);
1923 __disable_port(port);
1924 /* Slave array needs an update */
1925 *update_slave_arr = true;
1926 }
1927}
1928
1929/**
1930 * ad_marker_info_received - handle receive of a Marker information frame
1931 * @marker_info: Marker info received
1932 * @port: the port we're looking at
1933 */
1934static void ad_marker_info_received(struct bond_marker *marker_info,
1935 struct port *port)
1936{
1937 struct bond_marker marker;
1938
1939 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx);
1940 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx);
1941
1942 /* copy the received marker data to the response marker */
1943 memcpy(&marker, marker_info, sizeof(struct bond_marker));
1944 /* change the marker subtype to marker response */
1945 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1946
1947 /* send the marker response */
1948 if (ad_marker_send(port, &marker) >= 0)
1949 slave_dbg(port->slave->bond->dev, port->slave->dev,
1950 "Sent Marker Response on port %d\n",
1951 port->actor_port_number);
1952}
1953
1954/**
1955 * ad_marker_response_received - handle receive of a marker response frame
1956 * @marker: marker PDU received
1957 * @port: the port we're looking at
1958 *
1959 * This function does nothing since we decided not to implement send and handle
1960 * response for marker PDU's, in this stage, but only to respond to marker
1961 * information.
1962 */
1963static void ad_marker_response_received(struct bond_marker *marker,
1964 struct port *port)
1965{
1966 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx);
1967 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx);
1968
1969 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1970}
1971
1972/* ========= AD exported functions to the main bonding code ========= */
1973
1974/* Check aggregators status in team every T seconds */
1975#define AD_AGGREGATOR_SELECTION_TIMER 8
1976
1977/**
1978 * bond_3ad_initiate_agg_selection - initate aggregator selection
1979 * @bond: bonding struct
1980 *
1981 * Set the aggregation selection timer, to initiate an agg selection in
1982 * the very near future. Called during first initialization, and during
1983 * any down to up transitions of the bond.
1984 */
1985void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1986{
1987 BOND_AD_INFO(bond).agg_select_timer = timeout;
1988}
1989
1990/**
1991 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1992 * @bond: bonding struct to work on
1993 * @tick_resolution: tick duration (millisecond resolution)
1994 *
1995 * Can be called only after the mac address of the bond is set.
1996 */
1997void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1998{
1999 /* check that the bond is not initialized yet */
2000 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
2001 bond->dev->dev_addr)) {
2002
2003 BOND_AD_INFO(bond).aggregator_identifier = 0;
2004
2005 BOND_AD_INFO(bond).system.sys_priority =
2006 bond->params.ad_actor_sys_prio;
2007 if (is_zero_ether_addr(bond->params.ad_actor_system))
2008 BOND_AD_INFO(bond).system.sys_mac_addr =
2009 *((struct mac_addr *)bond->dev->dev_addr);
2010 else
2011 BOND_AD_INFO(bond).system.sys_mac_addr =
2012 *((struct mac_addr *)bond->params.ad_actor_system);
2013
2014 /* initialize how many times this module is called in one
2015 * second (should be about every 100ms)
2016 */
2017 ad_ticks_per_sec = tick_resolution;
2018
2019 bond_3ad_initiate_agg_selection(bond,
2020 AD_AGGREGATOR_SELECTION_TIMER *
2021 ad_ticks_per_sec);
2022 }
2023}
2024
2025/**
2026 * bond_3ad_bind_slave - initialize a slave's port
2027 * @slave: slave struct to work on
2028 *
2029 * Returns: 0 on success
2030 * < 0 on error
2031 */
2032void bond_3ad_bind_slave(struct slave *slave)
2033{
2034 struct bonding *bond = bond_get_bond_by_slave(slave);
2035 struct port *port;
2036 struct aggregator *aggregator;
2037
2038 /* check that the slave has not been initialized yet. */
2039 if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2040
2041 /* port initialization */
2042 port = &(SLAVE_AD_INFO(slave)->port);
2043
2044 ad_initialize_port(port, bond->params.lacp_fast);
2045
2046 port->slave = slave;
2047 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2048 /* key is determined according to the link speed, duplex and
2049 * user key
2050 */
2051 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2052 ad_update_actor_keys(port, false);
2053 /* actor system is the bond's system */
2054 __ad_actor_update_port(port);
2055 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2056 * lacpdu's are sent in one second)
2057 */
2058 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2059
2060 __disable_port(port);
2061
2062 /* aggregator initialization */
2063 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2064
2065 ad_initialize_agg(aggregator);
2066
2067 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2068 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2069 aggregator->slave = slave;
2070 aggregator->is_active = 0;
2071 aggregator->num_of_ports = 0;
2072 }
2073}
2074
2075/**
2076 * bond_3ad_unbind_slave - deinitialize a slave's port
2077 * @slave: slave struct to work on
2078 *
2079 * Search for the aggregator that is related to this port, remove the
2080 * aggregator and assign another aggregator for other port related to it
2081 * (if any), and remove the port.
2082 */
2083void bond_3ad_unbind_slave(struct slave *slave)
2084{
2085 struct port *port, *prev_port, *temp_port;
2086 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2087 int select_new_active_agg = 0;
2088 struct bonding *bond = slave->bond;
2089 struct slave *slave_iter;
2090 struct list_head *iter;
2091 bool dummy_slave_update; /* Ignore this value as caller updates array */
2092
2093 /* Sync against bond_3ad_state_machine_handler() */
2094 spin_lock_bh(&bond->mode_lock);
2095 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2096 port = &(SLAVE_AD_INFO(slave)->port);
2097
2098 /* if slave is null, the whole port is not initialized */
2099 if (!port->slave) {
2100 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n");
2101 goto out;
2102 }
2103
2104 slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n",
2105 aggregator->aggregator_identifier);
2106
2107 /* Tell the partner that this port is not suitable for aggregation */
2108 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
2109 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
2110 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
2111 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2112 __update_lacpdu_from_port(port);
2113 ad_lacpdu_send(port);
2114
2115 /* check if this aggregator is occupied */
2116 if (aggregator->lag_ports) {
2117 /* check if there are other ports related to this aggregator
2118 * except the port related to this slave(thats ensure us that
2119 * there is a reason to search for new aggregator, and that we
2120 * will find one
2121 */
2122 if ((aggregator->lag_ports != port) ||
2123 (aggregator->lag_ports->next_port_in_aggregator)) {
2124 /* find new aggregator for the related port(s) */
2125 bond_for_each_slave(bond, slave_iter, iter) {
2126 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2127 /* if the new aggregator is empty, or it is
2128 * connected to our port only
2129 */
2130 if (!new_aggregator->lag_ports ||
2131 ((new_aggregator->lag_ports == port) &&
2132 !new_aggregator->lag_ports->next_port_in_aggregator))
2133 break;
2134 }
2135 if (!slave_iter)
2136 new_aggregator = NULL;
2137
2138 /* if new aggregator found, copy the aggregator's
2139 * parameters and connect the related lag_ports to the
2140 * new aggregator
2141 */
2142 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2143 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2144 aggregator->aggregator_identifier,
2145 new_aggregator->aggregator_identifier);
2146
2147 if ((new_aggregator->lag_ports == port) &&
2148 new_aggregator->is_active) {
2149 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2150 select_new_active_agg = 1;
2151 }
2152
2153 new_aggregator->is_individual = aggregator->is_individual;
2154 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2155 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2156 new_aggregator->partner_system = aggregator->partner_system;
2157 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2158 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2159 new_aggregator->receive_state = aggregator->receive_state;
2160 new_aggregator->transmit_state = aggregator->transmit_state;
2161 new_aggregator->lag_ports = aggregator->lag_ports;
2162 new_aggregator->is_active = aggregator->is_active;
2163 new_aggregator->num_of_ports = aggregator->num_of_ports;
2164
2165 /* update the information that is written on
2166 * the ports about the aggregator
2167 */
2168 for (temp_port = aggregator->lag_ports; temp_port;
2169 temp_port = temp_port->next_port_in_aggregator) {
2170 temp_port->aggregator = new_aggregator;
2171 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2172 }
2173
2174 ad_clear_agg(aggregator);
2175
2176 if (select_new_active_agg)
2177 ad_agg_selection_logic(__get_first_agg(port),
2178 &dummy_slave_update);
2179 } else {
2180 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2181 }
2182 } else {
2183 /* in case that the only port related to this
2184 * aggregator is the one we want to remove
2185 */
2186 select_new_active_agg = aggregator->is_active;
2187 ad_clear_agg(aggregator);
2188 if (select_new_active_agg) {
2189 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2190 /* select new active aggregator */
2191 temp_aggregator = __get_first_agg(port);
2192 if (temp_aggregator)
2193 ad_agg_selection_logic(temp_aggregator,
2194 &dummy_slave_update);
2195 }
2196 }
2197 }
2198
2199 slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number);
2200
2201 /* find the aggregator that this port is connected to */
2202 bond_for_each_slave(bond, slave_iter, iter) {
2203 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2204 prev_port = NULL;
2205 /* search the port in the aggregator's related ports */
2206 for (temp_port = temp_aggregator->lag_ports; temp_port;
2207 prev_port = temp_port,
2208 temp_port = temp_port->next_port_in_aggregator) {
2209 if (temp_port == port) {
2210 /* the aggregator found - detach the port from
2211 * this aggregator
2212 */
2213 if (prev_port)
2214 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2215 else
2216 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2217 temp_aggregator->num_of_ports--;
2218 if (__agg_active_ports(temp_aggregator) == 0) {
2219 select_new_active_agg = temp_aggregator->is_active;
2220 ad_clear_agg(temp_aggregator);
2221 if (select_new_active_agg) {
2222 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2223 /* select new active aggregator */
2224 ad_agg_selection_logic(__get_first_agg(port),
2225 &dummy_slave_update);
2226 }
2227 }
2228 break;
2229 }
2230 }
2231 }
2232 port->slave = NULL;
2233
2234out:
2235 spin_unlock_bh(&bond->mode_lock);
2236}
2237
2238/**
2239 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2240 * @bond: bonding struct to work on
2241 *
2242 * If an ad_actor setting gets changed we need to update the individual port
2243 * settings so the bond device will use the new values when it gets upped.
2244 */
2245void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2246{
2247 struct list_head *iter;
2248 struct slave *slave;
2249
2250 ASSERT_RTNL();
2251
2252 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2253 if (is_zero_ether_addr(bond->params.ad_actor_system))
2254 BOND_AD_INFO(bond).system.sys_mac_addr =
2255 *((struct mac_addr *)bond->dev->dev_addr);
2256 else
2257 BOND_AD_INFO(bond).system.sys_mac_addr =
2258 *((struct mac_addr *)bond->params.ad_actor_system);
2259
2260 spin_lock_bh(&bond->mode_lock);
2261 bond_for_each_slave(bond, slave, iter) {
2262 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2263
2264 __ad_actor_update_port(port);
2265 port->ntt = true;
2266 }
2267 spin_unlock_bh(&bond->mode_lock);
2268}
2269
2270/**
2271 * bond_3ad_state_machine_handler - handle state machines timeout
2272 * @bond: bonding struct to work on
2273 *
2274 * The state machine handling concept in this module is to check every tick
2275 * which state machine should operate any function. The execution order is
2276 * round robin, so when we have an interaction between state machines, the
2277 * reply of one to each other might be delayed until next tick.
2278 *
2279 * This function also complete the initialization when the agg_select_timer
2280 * times out, and it selects an aggregator for the ports that are yet not
2281 * related to any aggregator, and selects the active aggregator for a bond.
2282 */
2283void bond_3ad_state_machine_handler(struct work_struct *work)
2284{
2285 struct bonding *bond = container_of(work, struct bonding,
2286 ad_work.work);
2287 struct aggregator *aggregator;
2288 struct list_head *iter;
2289 struct slave *slave;
2290 struct port *port;
2291 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2292 bool update_slave_arr = false;
2293
2294 /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2295 * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2296 * concurrently due to incoming LACPDU as well.
2297 */
2298 spin_lock_bh(&bond->mode_lock);
2299 rcu_read_lock();
2300
2301 /* check if there are any slaves */
2302 if (!bond_has_slaves(bond))
2303 goto re_arm;
2304
2305 /* check if agg_select_timer timer after initialize is timed out */
2306 if (BOND_AD_INFO(bond).agg_select_timer &&
2307 !(--BOND_AD_INFO(bond).agg_select_timer)) {
2308 slave = bond_first_slave_rcu(bond);
2309 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2310
2311 /* select the active aggregator for the bond */
2312 if (port) {
2313 if (!port->slave) {
2314 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2315 bond->dev->name);
2316 goto re_arm;
2317 }
2318
2319 aggregator = __get_first_agg(port);
2320 ad_agg_selection_logic(aggregator, &update_slave_arr);
2321 }
2322 bond_3ad_set_carrier(bond);
2323 }
2324
2325 /* for each port run the state machines */
2326 bond_for_each_slave_rcu(bond, slave, iter) {
2327 port = &(SLAVE_AD_INFO(slave)->port);
2328 if (!port->slave) {
2329 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2330 bond->dev->name);
2331 goto re_arm;
2332 }
2333
2334 ad_rx_machine(NULL, port);
2335 ad_periodic_machine(port);
2336 ad_port_selection_logic(port, &update_slave_arr);
2337 ad_mux_machine(port, &update_slave_arr);
2338 ad_tx_machine(port);
2339 ad_churn_machine(port);
2340
2341 /* turn off the BEGIN bit, since we already handled it */
2342 if (port->sm_vars & AD_PORT_BEGIN)
2343 port->sm_vars &= ~AD_PORT_BEGIN;
2344 }
2345
2346re_arm:
2347 bond_for_each_slave_rcu(bond, slave, iter) {
2348 if (slave->should_notify) {
2349 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2350 break;
2351 }
2352 }
2353 rcu_read_unlock();
2354 spin_unlock_bh(&bond->mode_lock);
2355
2356 if (update_slave_arr)
2357 bond_slave_arr_work_rearm(bond, 0);
2358
2359 if (should_notify_rtnl && rtnl_trylock()) {
2360 bond_slave_state_notify(bond);
2361 rtnl_unlock();
2362 }
2363 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2364}
2365
2366/**
2367 * bond_3ad_rx_indication - handle a received frame
2368 * @lacpdu: received lacpdu
2369 * @slave: slave struct to work on
2370 *
2371 * It is assumed that frames that were sent on this NIC don't returned as new
2372 * received frames (loopback). Since only the payload is given to this
2373 * function, it check for loopback.
2374 */
2375static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave)
2376{
2377 struct bonding *bond = slave->bond;
2378 int ret = RX_HANDLER_ANOTHER;
2379 struct bond_marker *marker;
2380 struct port *port;
2381 atomic64_t *stat;
2382
2383 port = &(SLAVE_AD_INFO(slave)->port);
2384 if (!port->slave) {
2385 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2386 slave->dev->name, slave->bond->dev->name);
2387 return ret;
2388 }
2389
2390 switch (lacpdu->subtype) {
2391 case AD_TYPE_LACPDU:
2392 ret = RX_HANDLER_CONSUMED;
2393 slave_dbg(slave->bond->dev, slave->dev,
2394 "Received LACPDU on port %d\n",
2395 port->actor_port_number);
2396 /* Protect against concurrent state machines */
2397 spin_lock(&slave->bond->mode_lock);
2398 ad_rx_machine(lacpdu, port);
2399 spin_unlock(&slave->bond->mode_lock);
2400 break;
2401 case AD_TYPE_MARKER:
2402 ret = RX_HANDLER_CONSUMED;
2403 /* No need to convert fields to Little Endian since we
2404 * don't use the marker's fields.
2405 */
2406 marker = (struct bond_marker *)lacpdu;
2407 switch (marker->tlv_type) {
2408 case AD_MARKER_INFORMATION_SUBTYPE:
2409 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n",
2410 port->actor_port_number);
2411 ad_marker_info_received(marker, port);
2412 break;
2413 case AD_MARKER_RESPONSE_SUBTYPE:
2414 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n",
2415 port->actor_port_number);
2416 ad_marker_response_received(marker, port);
2417 break;
2418 default:
2419 slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n",
2420 port->actor_port_number);
2421 stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx;
2422 atomic64_inc(stat);
2423 stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx;
2424 atomic64_inc(stat);
2425 }
2426 break;
2427 default:
2428 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx);
2429 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx);
2430 }
2431
2432 return ret;
2433}
2434
2435/**
2436 * ad_update_actor_keys - Update the oper / admin keys for a port based on
2437 * its current speed and duplex settings.
2438 *
2439 * @port: the port we'are looking at
2440 * @reset: Boolean to just reset the speed and the duplex part of the key
2441 *
2442 * The logic to change the oper / admin keys is:
2443 * (a) A full duplex port can participate in LACP with partner.
2444 * (b) When the speed is changed, LACP need to be reinitiated.
2445 */
2446static void ad_update_actor_keys(struct port *port, bool reset)
2447{
2448 u8 duplex = 0;
2449 u16 ospeed = 0, speed = 0;
2450 u16 old_oper_key = port->actor_oper_port_key;
2451
2452 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2453 if (!reset) {
2454 speed = __get_link_speed(port);
2455 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2456 duplex = __get_duplex(port);
2457 port->actor_admin_port_key |= (speed << 1) | duplex;
2458 }
2459 port->actor_oper_port_key = port->actor_admin_port_key;
2460
2461 if (old_oper_key != port->actor_oper_port_key) {
2462 /* Only 'duplex' port participates in LACP */
2463 if (duplex)
2464 port->sm_vars |= AD_PORT_LACP_ENABLED;
2465 else
2466 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2467
2468 if (!reset) {
2469 if (!speed) {
2470 slave_err(port->slave->bond->dev,
2471 port->slave->dev,
2472 "speed changed to 0 on port %d\n",
2473 port->actor_port_number);
2474 } else if (duplex && ospeed != speed) {
2475 /* Speed change restarts LACP state-machine */
2476 port->sm_vars |= AD_PORT_BEGIN;
2477 }
2478 }
2479 }
2480}
2481
2482/**
2483 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2484 * change indication
2485 *
2486 * @slave: slave struct to work on
2487 *
2488 * Handle reselection of aggregator (if needed) for this port.
2489 */
2490void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2491{
2492 struct port *port;
2493
2494 port = &(SLAVE_AD_INFO(slave)->port);
2495
2496 /* if slave is null, the whole port is not initialized */
2497 if (!port->slave) {
2498 slave_warn(slave->bond->dev, slave->dev,
2499 "speed/duplex changed for uninitialized port\n");
2500 return;
2501 }
2502
2503 spin_lock_bh(&slave->bond->mode_lock);
2504 ad_update_actor_keys(port, false);
2505 spin_unlock_bh(&slave->bond->mode_lock);
2506 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n",
2507 port->actor_port_number);
2508}
2509
2510/**
2511 * bond_3ad_handle_link_change - handle a slave's link status change indication
2512 * @slave: slave struct to work on
2513 * @status: whether the link is now up or down
2514 *
2515 * Handle reselection of aggregator (if needed) for this port.
2516 */
2517void bond_3ad_handle_link_change(struct slave *slave, char link)
2518{
2519 struct aggregator *agg;
2520 struct port *port;
2521 bool dummy;
2522
2523 port = &(SLAVE_AD_INFO(slave)->port);
2524
2525 /* if slave is null, the whole port is not initialized */
2526 if (!port->slave) {
2527 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n");
2528 return;
2529 }
2530
2531 spin_lock_bh(&slave->bond->mode_lock);
2532 /* on link down we are zeroing duplex and speed since
2533 * some of the adaptors(ce1000.lan) report full duplex/speed
2534 * instead of N/A(duplex) / 0(speed).
2535 *
2536 * on link up we are forcing recheck on the duplex and speed since
2537 * some of he adaptors(ce1000.lan) report.
2538 */
2539 if (link == BOND_LINK_UP) {
2540 port->is_enabled = true;
2541 ad_update_actor_keys(port, false);
2542 } else {
2543 /* link has failed */
2544 port->is_enabled = false;
2545 ad_update_actor_keys(port, true);
2546 }
2547 agg = __get_first_agg(port);
2548 ad_agg_selection_logic(agg, &dummy);
2549
2550 spin_unlock_bh(&slave->bond->mode_lock);
2551
2552 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n",
2553 port->actor_port_number,
2554 link == BOND_LINK_UP ? "UP" : "DOWN");
2555
2556 /* RTNL is held and mode_lock is released so it's safe
2557 * to update slave_array here.
2558 */
2559 bond_update_slave_arr(slave->bond, NULL);
2560}
2561
2562/**
2563 * bond_3ad_set_carrier - set link state for bonding master
2564 * @bond - bonding structure
2565 *
2566 * if we have an active aggregator, we're up, if not, we're down.
2567 * Presumes that we cannot have an active aggregator if there are
2568 * no slaves with link up.
2569 *
2570 * This behavior complies with IEEE 802.3 section 43.3.9.
2571 *
2572 * Called by bond_set_carrier(). Return zero if carrier state does not
2573 * change, nonzero if it does.
2574 */
2575int bond_3ad_set_carrier(struct bonding *bond)
2576{
2577 struct aggregator *active;
2578 struct slave *first_slave;
2579 int ret = 1;
2580
2581 rcu_read_lock();
2582 first_slave = bond_first_slave_rcu(bond);
2583 if (!first_slave) {
2584 ret = 0;
2585 goto out;
2586 }
2587 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2588 if (active) {
2589 /* are enough slaves available to consider link up? */
2590 if (__agg_active_ports(active) < bond->params.min_links) {
2591 if (netif_carrier_ok(bond->dev)) {
2592 netif_carrier_off(bond->dev);
2593 goto out;
2594 }
2595 } else if (!netif_carrier_ok(bond->dev)) {
2596 netif_carrier_on(bond->dev);
2597 goto out;
2598 }
2599 } else if (netif_carrier_ok(bond->dev)) {
2600 netif_carrier_off(bond->dev);
2601 }
2602out:
2603 rcu_read_unlock();
2604 return ret;
2605}
2606
2607/**
2608 * __bond_3ad_get_active_agg_info - get information of the active aggregator
2609 * @bond: bonding struct to work on
2610 * @ad_info: ad_info struct to fill with the bond's info
2611 *
2612 * Returns: 0 on success
2613 * < 0 on error
2614 */
2615int __bond_3ad_get_active_agg_info(struct bonding *bond,
2616 struct ad_info *ad_info)
2617{
2618 struct aggregator *aggregator = NULL;
2619 struct list_head *iter;
2620 struct slave *slave;
2621 struct port *port;
2622
2623 bond_for_each_slave_rcu(bond, slave, iter) {
2624 port = &(SLAVE_AD_INFO(slave)->port);
2625 if (port->aggregator && port->aggregator->is_active) {
2626 aggregator = port->aggregator;
2627 break;
2628 }
2629 }
2630
2631 if (!aggregator)
2632 return -1;
2633
2634 ad_info->aggregator_id = aggregator->aggregator_identifier;
2635 ad_info->ports = __agg_active_ports(aggregator);
2636 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2637 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2638 ether_addr_copy(ad_info->partner_system,
2639 aggregator->partner_system.mac_addr_value);
2640 return 0;
2641}
2642
2643int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2644{
2645 int ret;
2646
2647 rcu_read_lock();
2648 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2649 rcu_read_unlock();
2650
2651 return ret;
2652}
2653
2654int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2655 struct slave *slave)
2656{
2657 struct lacpdu *lacpdu, _lacpdu;
2658
2659 if (skb->protocol != PKT_TYPE_LACPDU)
2660 return RX_HANDLER_ANOTHER;
2661
2662 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2663 return RX_HANDLER_ANOTHER;
2664
2665 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2666 if (!lacpdu) {
2667 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx);
2668 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx);
2669 return RX_HANDLER_ANOTHER;
2670 }
2671
2672 return bond_3ad_rx_indication(lacpdu, slave);
2673}
2674
2675/**
2676 * bond_3ad_update_lacp_rate - change the lacp rate
2677 * @bond - bonding struct
2678 *
2679 * When modify lacp_rate parameter via sysfs,
2680 * update actor_oper_port_state of each port.
2681 *
2682 * Hold bond->mode_lock,
2683 * so we can modify port->actor_oper_port_state,
2684 * no matter bond is up or down.
2685 */
2686void bond_3ad_update_lacp_rate(struct bonding *bond)
2687{
2688 struct port *port = NULL;
2689 struct list_head *iter;
2690 struct slave *slave;
2691 int lacp_fast;
2692
2693 lacp_fast = bond->params.lacp_fast;
2694 spin_lock_bh(&bond->mode_lock);
2695 bond_for_each_slave(bond, slave, iter) {
2696 port = &(SLAVE_AD_INFO(slave)->port);
2697 if (lacp_fast)
2698 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2699 else
2700 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2701 }
2702 spin_unlock_bh(&bond->mode_lock);
2703}
2704
2705size_t bond_3ad_stats_size(void)
2706{
2707 return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */
2708 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */
2709 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */
2710 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */
2711 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */
2712 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */
2713 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */
2714 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */
2715 nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */
2716}
2717
2718int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats)
2719{
2720 u64 val;
2721
2722 val = atomic64_read(&stats->lacpdu_rx);
2723 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val,
2724 BOND_3AD_STAT_PAD))
2725 return -EMSGSIZE;
2726 val = atomic64_read(&stats->lacpdu_tx);
2727 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val,
2728 BOND_3AD_STAT_PAD))
2729 return -EMSGSIZE;
2730 val = atomic64_read(&stats->lacpdu_unknown_rx);
2731 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val,
2732 BOND_3AD_STAT_PAD))
2733 return -EMSGSIZE;
2734 val = atomic64_read(&stats->lacpdu_illegal_rx);
2735 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val,
2736 BOND_3AD_STAT_PAD))
2737 return -EMSGSIZE;
2738
2739 val = atomic64_read(&stats->marker_rx);
2740 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val,
2741 BOND_3AD_STAT_PAD))
2742 return -EMSGSIZE;
2743 val = atomic64_read(&stats->marker_tx);
2744 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val,
2745 BOND_3AD_STAT_PAD))
2746 return -EMSGSIZE;
2747 val = atomic64_read(&stats->marker_resp_rx);
2748 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val,
2749 BOND_3AD_STAT_PAD))
2750 return -EMSGSIZE;
2751 val = atomic64_read(&stats->marker_resp_tx);
2752 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val,
2753 BOND_3AD_STAT_PAD))
2754 return -EMSGSIZE;
2755 val = atomic64_read(&stats->marker_unknown_rx);
2756 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val,
2757 BOND_3AD_STAT_PAD))
2758 return -EMSGSIZE;
2759
2760 return 0;
2761}
1/*
2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; either version 2 of the License, or (at your option)
7 * any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59
16 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 */
22
23#include <linux/skbuff.h>
24#include <linux/if_ether.h>
25#include <linux/netdevice.h>
26#include <linux/spinlock.h>
27#include <linux/ethtool.h>
28#include <linux/etherdevice.h>
29#include <linux/if_bonding.h>
30#include <linux/pkt_sched.h>
31#include <net/net_namespace.h>
32#include <net/bonding.h>
33#include <net/bond_3ad.h>
34
35/* General definitions */
36#define AD_SHORT_TIMEOUT 1
37#define AD_LONG_TIMEOUT 0
38#define AD_STANDBY 0x2
39#define AD_MAX_TX_IN_SECOND 3
40#define AD_COLLECTOR_MAX_DELAY 0
41
42/* Timer definitions (43.4.4 in the 802.3ad standard) */
43#define AD_FAST_PERIODIC_TIME 1
44#define AD_SLOW_PERIODIC_TIME 30
45#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
46#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
47#define AD_CHURN_DETECTION_TIME 60
48#define AD_AGGREGATE_WAIT_TIME 2
49
50/* Port state definitions (43.4.2.2 in the 802.3ad standard) */
51#define AD_STATE_LACP_ACTIVITY 0x1
52#define AD_STATE_LACP_TIMEOUT 0x2
53#define AD_STATE_AGGREGATION 0x4
54#define AD_STATE_SYNCHRONIZATION 0x8
55#define AD_STATE_COLLECTING 0x10
56#define AD_STATE_DISTRIBUTING 0x20
57#define AD_STATE_DEFAULTED 0x40
58#define AD_STATE_EXPIRED 0x80
59
60/* Port Variables definitions used by the State Machines (43.4.7 in the
61 * 802.3ad standard)
62 */
63#define AD_PORT_BEGIN 0x1
64#define AD_PORT_LACP_ENABLED 0x2
65#define AD_PORT_ACTOR_CHURN 0x4
66#define AD_PORT_PARTNER_CHURN 0x8
67#define AD_PORT_READY 0x10
68#define AD_PORT_READY_N 0x20
69#define AD_PORT_MATCHED 0x40
70#define AD_PORT_STANDBY 0x80
71#define AD_PORT_SELECTED 0x100
72#define AD_PORT_MOVED 0x200
73#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
74
75/* Port Key definitions
76 * key is determined according to the link speed, duplex and
77 * user key (which is yet not supported)
78 * --------------------------------------------------------------
79 * Port key | User key (10 bits) | Speed (5 bits) | Duplex|
80 * --------------------------------------------------------------
81 * |15 6|5 1|0
82 */
83#define AD_DUPLEX_KEY_MASKS 0x1
84#define AD_SPEED_KEY_MASKS 0x3E
85#define AD_USER_KEY_MASKS 0xFFC0
86
87enum ad_link_speed_type {
88 AD_LINK_SPEED_1MBPS = 1,
89 AD_LINK_SPEED_10MBPS,
90 AD_LINK_SPEED_100MBPS,
91 AD_LINK_SPEED_1000MBPS,
92 AD_LINK_SPEED_2500MBPS,
93 AD_LINK_SPEED_10000MBPS,
94 AD_LINK_SPEED_20000MBPS,
95 AD_LINK_SPEED_40000MBPS,
96 AD_LINK_SPEED_56000MBPS,
97 AD_LINK_SPEED_100000MBPS,
98};
99
100/* compare MAC addresses */
101#define MAC_ADDRESS_EQUAL(A, B) \
102 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
103
104static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
105static u16 ad_ticks_per_sec;
106static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
107
108static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
109
110/* ================= main 802.3ad protocol functions ================== */
111static int ad_lacpdu_send(struct port *port);
112static int ad_marker_send(struct port *port, struct bond_marker *marker);
113static void ad_mux_machine(struct port *port, bool *update_slave_arr);
114static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
115static void ad_tx_machine(struct port *port);
116static void ad_periodic_machine(struct port *port);
117static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
118static void ad_agg_selection_logic(struct aggregator *aggregator,
119 bool *update_slave_arr);
120static void ad_clear_agg(struct aggregator *aggregator);
121static void ad_initialize_agg(struct aggregator *aggregator);
122static void ad_initialize_port(struct port *port, int lacp_fast);
123static void ad_enable_collecting_distributing(struct port *port,
124 bool *update_slave_arr);
125static void ad_disable_collecting_distributing(struct port *port,
126 bool *update_slave_arr);
127static void ad_marker_info_received(struct bond_marker *marker_info,
128 struct port *port);
129static void ad_marker_response_received(struct bond_marker *marker,
130 struct port *port);
131static void ad_update_actor_keys(struct port *port, bool reset);
132
133
134/* ================= api to bonding and kernel code ================== */
135
136/**
137 * __get_bond_by_port - get the port's bonding struct
138 * @port: the port we're looking at
139 *
140 * Return @port's bonding struct, or %NULL if it can't be found.
141 */
142static inline struct bonding *__get_bond_by_port(struct port *port)
143{
144 if (port->slave == NULL)
145 return NULL;
146
147 return bond_get_bond_by_slave(port->slave);
148}
149
150/**
151 * __get_first_agg - get the first aggregator in the bond
152 * @bond: the bond we're looking at
153 *
154 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
155 * found.
156 * The caller must hold RCU or RTNL lock.
157 */
158static inline struct aggregator *__get_first_agg(struct port *port)
159{
160 struct bonding *bond = __get_bond_by_port(port);
161 struct slave *first_slave;
162 struct aggregator *agg;
163
164 /* If there's no bond for this port, or bond has no slaves */
165 if (bond == NULL)
166 return NULL;
167
168 rcu_read_lock();
169 first_slave = bond_first_slave_rcu(bond);
170 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
171 rcu_read_unlock();
172
173 return agg;
174}
175
176/**
177 * __agg_has_partner - see if we have a partner
178 * @agg: the agregator we're looking at
179 *
180 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
181 * address for the partner). Return 0 if not.
182 */
183static inline int __agg_has_partner(struct aggregator *agg)
184{
185 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
186}
187
188/**
189 * __disable_port - disable the port's slave
190 * @port: the port we're looking at
191 */
192static inline void __disable_port(struct port *port)
193{
194 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
195}
196
197/**
198 * __enable_port - enable the port's slave, if it's up
199 * @port: the port we're looking at
200 */
201static inline void __enable_port(struct port *port)
202{
203 struct slave *slave = port->slave;
204
205 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
206 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
207}
208
209/**
210 * __port_is_enabled - check if the port's slave is in active state
211 * @port: the port we're looking at
212 */
213static inline int __port_is_enabled(struct port *port)
214{
215 return bond_is_active_slave(port->slave);
216}
217
218/**
219 * __get_agg_selection_mode - get the aggregator selection mode
220 * @port: the port we're looking at
221 *
222 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
223 */
224static inline u32 __get_agg_selection_mode(struct port *port)
225{
226 struct bonding *bond = __get_bond_by_port(port);
227
228 if (bond == NULL)
229 return BOND_AD_STABLE;
230
231 return bond->params.ad_select;
232}
233
234/**
235 * __check_agg_selection_timer - check if the selection timer has expired
236 * @port: the port we're looking at
237 */
238static inline int __check_agg_selection_timer(struct port *port)
239{
240 struct bonding *bond = __get_bond_by_port(port);
241
242 if (bond == NULL)
243 return 0;
244
245 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
246}
247
248/**
249 * __get_link_speed - get a port's speed
250 * @port: the port we're looking at
251 *
252 * Return @port's speed in 802.3ad enum format. i.e. one of:
253 * 0,
254 * %AD_LINK_SPEED_10MBPS,
255 * %AD_LINK_SPEED_100MBPS,
256 * %AD_LINK_SPEED_1000MBPS,
257 * %AD_LINK_SPEED_2500MBPS,
258 * %AD_LINK_SPEED_10000MBPS
259 * %AD_LINK_SPEED_20000MBPS
260 * %AD_LINK_SPEED_40000MBPS
261 * %AD_LINK_SPEED_56000MBPS
262 * %AD_LINK_SPEED_100000MBPS
263 */
264static u16 __get_link_speed(struct port *port)
265{
266 struct slave *slave = port->slave;
267 u16 speed;
268
269 /* this if covers only a special case: when the configuration starts
270 * with link down, it sets the speed to 0.
271 * This is done in spite of the fact that the e100 driver reports 0
272 * to be compatible with MVT in the future.
273 */
274 if (slave->link != BOND_LINK_UP)
275 speed = 0;
276 else {
277 switch (slave->speed) {
278 case SPEED_10:
279 speed = AD_LINK_SPEED_10MBPS;
280 break;
281
282 case SPEED_100:
283 speed = AD_LINK_SPEED_100MBPS;
284 break;
285
286 case SPEED_1000:
287 speed = AD_LINK_SPEED_1000MBPS;
288 break;
289
290 case SPEED_2500:
291 speed = AD_LINK_SPEED_2500MBPS;
292 break;
293
294 case SPEED_10000:
295 speed = AD_LINK_SPEED_10000MBPS;
296 break;
297
298 case SPEED_20000:
299 speed = AD_LINK_SPEED_20000MBPS;
300 break;
301
302 case SPEED_40000:
303 speed = AD_LINK_SPEED_40000MBPS;
304 break;
305
306 case SPEED_56000:
307 speed = AD_LINK_SPEED_56000MBPS;
308 break;
309
310 case SPEED_100000:
311 speed = AD_LINK_SPEED_100000MBPS;
312 break;
313
314 default:
315 /* unknown speed value from ethtool. shouldn't happen */
316 speed = 0;
317 break;
318 }
319 }
320
321 netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
322 port->actor_port_number, speed);
323 return speed;
324}
325
326/**
327 * __get_duplex - get a port's duplex
328 * @port: the port we're looking at
329 *
330 * Return @port's duplex in 802.3ad bitmask format. i.e.:
331 * 0x01 if in full duplex
332 * 0x00 otherwise
333 */
334static u8 __get_duplex(struct port *port)
335{
336 struct slave *slave = port->slave;
337 u8 retval = 0x0;
338
339 /* handling a special case: when the configuration starts with
340 * link down, it sets the duplex to 0.
341 */
342 if (slave->link == BOND_LINK_UP) {
343 switch (slave->duplex) {
344 case DUPLEX_FULL:
345 retval = 0x1;
346 netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
347 port->actor_port_number);
348 break;
349 case DUPLEX_HALF:
350 default:
351 retval = 0x0;
352 netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
353 port->actor_port_number);
354 break;
355 }
356 }
357 return retval;
358}
359
360static void __ad_actor_update_port(struct port *port)
361{
362 const struct bonding *bond = bond_get_bond_by_slave(port->slave);
363
364 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
365 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
366}
367
368/* Conversions */
369
370/**
371 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
372 * @timer_type: which timer to operate
373 * @par: timer parameter. see below
374 *
375 * If @timer_type is %current_while_timer, @par indicates long/short timer.
376 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
377 * %SLOW_PERIODIC_TIME.
378 */
379static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
380{
381 u16 retval = 0; /* to silence the compiler */
382
383 switch (timer_type) {
384 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
385 if (par)
386 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
387 else
388 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
389 break;
390 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
391 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
392 break;
393 case AD_PERIODIC_TIMER: /* for periodic machine */
394 retval = (par*ad_ticks_per_sec); /* long timeout */
395 break;
396 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
397 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
398 break;
399 case AD_WAIT_WHILE_TIMER: /* for selection machine */
400 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
401 break;
402 }
403
404 return retval;
405}
406
407
408/* ================= ad_rx_machine helper functions ================== */
409
410/**
411 * __choose_matched - update a port's matched variable from a received lacpdu
412 * @lacpdu: the lacpdu we've received
413 * @port: the port we're looking at
414 *
415 * Update the value of the matched variable, using parameter values from a
416 * newly received lacpdu. Parameter values for the partner carried in the
417 * received PDU are compared with the corresponding operational parameter
418 * values for the actor. Matched is set to TRUE if all of these parameters
419 * match and the PDU parameter partner_state.aggregation has the same value as
420 * actor_oper_port_state.aggregation and lacp will actively maintain the link
421 * in the aggregation. Matched is also set to TRUE if the value of
422 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
423 * an individual link and lacp will actively maintain the link. Otherwise,
424 * matched is set to FALSE. LACP is considered to be actively maintaining the
425 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
426 * the actor's actor_oper_port_state.lacp_activity and the PDU's
427 * partner_state.lacp_activity variables are TRUE.
428 *
429 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
430 * used here to implement the language from 802.3ad 43.4.9 that requires
431 * recordPDU to "match" the LACPDU parameters to the stored values.
432 */
433static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
434{
435 /* check if all parameters are alike
436 * or this is individual link(aggregation == FALSE)
437 * then update the state machine Matched variable.
438 */
439 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
440 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
441 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
442 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
443 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
444 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
445 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
446 ) {
447 port->sm_vars |= AD_PORT_MATCHED;
448 } else {
449 port->sm_vars &= ~AD_PORT_MATCHED;
450 }
451}
452
453/**
454 * __record_pdu - record parameters from a received lacpdu
455 * @lacpdu: the lacpdu we've received
456 * @port: the port we're looking at
457 *
458 * Record the parameter values for the Actor carried in a received lacpdu as
459 * the current partner operational parameter values and sets
460 * actor_oper_port_state.defaulted to FALSE.
461 */
462static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
463{
464 if (lacpdu && port) {
465 struct port_params *partner = &port->partner_oper;
466
467 __choose_matched(lacpdu, port);
468 /* record the new parameter values for the partner
469 * operational
470 */
471 partner->port_number = ntohs(lacpdu->actor_port);
472 partner->port_priority = ntohs(lacpdu->actor_port_priority);
473 partner->system = lacpdu->actor_system;
474 partner->system_priority = ntohs(lacpdu->actor_system_priority);
475 partner->key = ntohs(lacpdu->actor_key);
476 partner->port_state = lacpdu->actor_state;
477
478 /* set actor_oper_port_state.defaulted to FALSE */
479 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
480
481 /* set the partner sync. to on if the partner is sync,
482 * and the port is matched
483 */
484 if ((port->sm_vars & AD_PORT_MATCHED) &&
485 (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
486 partner->port_state |= AD_STATE_SYNCHRONIZATION;
487 pr_debug("%s partner sync=1\n", port->slave->dev->name);
488 } else {
489 partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
490 pr_debug("%s partner sync=0\n", port->slave->dev->name);
491 }
492 }
493}
494
495/**
496 * __record_default - record default parameters
497 * @port: the port we're looking at
498 *
499 * This function records the default parameter values for the partner carried
500 * in the Partner Admin parameters as the current partner operational parameter
501 * values and sets actor_oper_port_state.defaulted to TRUE.
502 */
503static void __record_default(struct port *port)
504{
505 if (port) {
506 /* record the partner admin parameters */
507 memcpy(&port->partner_oper, &port->partner_admin,
508 sizeof(struct port_params));
509
510 /* set actor_oper_port_state.defaulted to true */
511 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
512 }
513}
514
515/**
516 * __update_selected - update a port's Selected variable from a received lacpdu
517 * @lacpdu: the lacpdu we've received
518 * @port: the port we're looking at
519 *
520 * Update the value of the selected variable, using parameter values from a
521 * newly received lacpdu. The parameter values for the Actor carried in the
522 * received PDU are compared with the corresponding operational parameter
523 * values for the ports partner. If one or more of the comparisons shows that
524 * the value(s) received in the PDU differ from the current operational values,
525 * then selected is set to FALSE and actor_oper_port_state.synchronization is
526 * set to out_of_sync. Otherwise, selected remains unchanged.
527 */
528static void __update_selected(struct lacpdu *lacpdu, struct port *port)
529{
530 if (lacpdu && port) {
531 const struct port_params *partner = &port->partner_oper;
532
533 /* check if any parameter is different then
534 * update the state machine selected variable.
535 */
536 if (ntohs(lacpdu->actor_port) != partner->port_number ||
537 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
538 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
539 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
540 ntohs(lacpdu->actor_key) != partner->key ||
541 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
542 port->sm_vars &= ~AD_PORT_SELECTED;
543 }
544 }
545}
546
547/**
548 * __update_default_selected - update a port's Selected variable from Partner
549 * @port: the port we're looking at
550 *
551 * This function updates the value of the selected variable, using the partner
552 * administrative parameter values. The administrative values are compared with
553 * the corresponding operational parameter values for the partner. If one or
554 * more of the comparisons shows that the administrative value(s) differ from
555 * the current operational values, then Selected is set to FALSE and
556 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
557 * Selected remains unchanged.
558 */
559static void __update_default_selected(struct port *port)
560{
561 if (port) {
562 const struct port_params *admin = &port->partner_admin;
563 const struct port_params *oper = &port->partner_oper;
564
565 /* check if any parameter is different then
566 * update the state machine selected variable.
567 */
568 if (admin->port_number != oper->port_number ||
569 admin->port_priority != oper->port_priority ||
570 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
571 admin->system_priority != oper->system_priority ||
572 admin->key != oper->key ||
573 (admin->port_state & AD_STATE_AGGREGATION)
574 != (oper->port_state & AD_STATE_AGGREGATION)) {
575 port->sm_vars &= ~AD_PORT_SELECTED;
576 }
577 }
578}
579
580/**
581 * __update_ntt - update a port's ntt variable from a received lacpdu
582 * @lacpdu: the lacpdu we've received
583 * @port: the port we're looking at
584 *
585 * Updates the value of the ntt variable, using parameter values from a newly
586 * received lacpdu. The parameter values for the partner carried in the
587 * received PDU are compared with the corresponding operational parameter
588 * values for the Actor. If one or more of the comparisons shows that the
589 * value(s) received in the PDU differ from the current operational values,
590 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
591 */
592static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
593{
594 /* validate lacpdu and port */
595 if (lacpdu && port) {
596 /* check if any parameter is different then
597 * update the port->ntt.
598 */
599 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
600 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
601 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
602 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
603 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
604 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
605 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
606 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
607 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
608 ) {
609 port->ntt = true;
610 }
611 }
612}
613
614/**
615 * __agg_ports_are_ready - check if all ports in an aggregator are ready
616 * @aggregator: the aggregator we're looking at
617 *
618 */
619static int __agg_ports_are_ready(struct aggregator *aggregator)
620{
621 struct port *port;
622 int retval = 1;
623
624 if (aggregator) {
625 /* scan all ports in this aggregator to verfy if they are
626 * all ready.
627 */
628 for (port = aggregator->lag_ports;
629 port;
630 port = port->next_port_in_aggregator) {
631 if (!(port->sm_vars & AD_PORT_READY_N)) {
632 retval = 0;
633 break;
634 }
635 }
636 }
637
638 return retval;
639}
640
641/**
642 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
643 * @aggregator: the aggregator we're looking at
644 * @val: Should the ports' ready bit be set on or off
645 *
646 */
647static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
648{
649 struct port *port;
650
651 for (port = aggregator->lag_ports; port;
652 port = port->next_port_in_aggregator) {
653 if (val)
654 port->sm_vars |= AD_PORT_READY;
655 else
656 port->sm_vars &= ~AD_PORT_READY;
657 }
658}
659
660/**
661 * __get_agg_bandwidth - get the total bandwidth of an aggregator
662 * @aggregator: the aggregator we're looking at
663 *
664 */
665static u32 __get_agg_bandwidth(struct aggregator *aggregator)
666{
667 u32 bandwidth = 0;
668
669 if (aggregator->num_of_ports) {
670 switch (__get_link_speed(aggregator->lag_ports)) {
671 case AD_LINK_SPEED_1MBPS:
672 bandwidth = aggregator->num_of_ports;
673 break;
674 case AD_LINK_SPEED_10MBPS:
675 bandwidth = aggregator->num_of_ports * 10;
676 break;
677 case AD_LINK_SPEED_100MBPS:
678 bandwidth = aggregator->num_of_ports * 100;
679 break;
680 case AD_LINK_SPEED_1000MBPS:
681 bandwidth = aggregator->num_of_ports * 1000;
682 break;
683 case AD_LINK_SPEED_2500MBPS:
684 bandwidth = aggregator->num_of_ports * 2500;
685 break;
686 case AD_LINK_SPEED_10000MBPS:
687 bandwidth = aggregator->num_of_ports * 10000;
688 break;
689 case AD_LINK_SPEED_20000MBPS:
690 bandwidth = aggregator->num_of_ports * 20000;
691 break;
692 case AD_LINK_SPEED_40000MBPS:
693 bandwidth = aggregator->num_of_ports * 40000;
694 break;
695 case AD_LINK_SPEED_56000MBPS:
696 bandwidth = aggregator->num_of_ports * 56000;
697 break;
698 case AD_LINK_SPEED_100000MBPS:
699 bandwidth = aggregator->num_of_ports * 100000;
700 break;
701 default:
702 bandwidth = 0; /* to silence the compiler */
703 }
704 }
705 return bandwidth;
706}
707
708/**
709 * __get_active_agg - get the current active aggregator
710 * @aggregator: the aggregator we're looking at
711 *
712 * Caller must hold RCU lock.
713 */
714static struct aggregator *__get_active_agg(struct aggregator *aggregator)
715{
716 struct bonding *bond = aggregator->slave->bond;
717 struct list_head *iter;
718 struct slave *slave;
719
720 bond_for_each_slave_rcu(bond, slave, iter)
721 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
722 return &(SLAVE_AD_INFO(slave)->aggregator);
723
724 return NULL;
725}
726
727/**
728 * __update_lacpdu_from_port - update a port's lacpdu fields
729 * @port: the port we're looking at
730 */
731static inline void __update_lacpdu_from_port(struct port *port)
732{
733 struct lacpdu *lacpdu = &port->lacpdu;
734 const struct port_params *partner = &port->partner_oper;
735
736 /* update current actual Actor parameters
737 * lacpdu->subtype initialized
738 * lacpdu->version_number initialized
739 * lacpdu->tlv_type_actor_info initialized
740 * lacpdu->actor_information_length initialized
741 */
742
743 lacpdu->actor_system_priority = htons(port->actor_system_priority);
744 lacpdu->actor_system = port->actor_system;
745 lacpdu->actor_key = htons(port->actor_oper_port_key);
746 lacpdu->actor_port_priority = htons(port->actor_port_priority);
747 lacpdu->actor_port = htons(port->actor_port_number);
748 lacpdu->actor_state = port->actor_oper_port_state;
749 pr_debug("update lacpdu: %s, actor port state %x\n",
750 port->slave->dev->name, port->actor_oper_port_state);
751
752 /* lacpdu->reserved_3_1 initialized
753 * lacpdu->tlv_type_partner_info initialized
754 * lacpdu->partner_information_length initialized
755 */
756
757 lacpdu->partner_system_priority = htons(partner->system_priority);
758 lacpdu->partner_system = partner->system;
759 lacpdu->partner_key = htons(partner->key);
760 lacpdu->partner_port_priority = htons(partner->port_priority);
761 lacpdu->partner_port = htons(partner->port_number);
762 lacpdu->partner_state = partner->port_state;
763
764 /* lacpdu->reserved_3_2 initialized
765 * lacpdu->tlv_type_collector_info initialized
766 * lacpdu->collector_information_length initialized
767 * collector_max_delay initialized
768 * reserved_12[12] initialized
769 * tlv_type_terminator initialized
770 * terminator_length initialized
771 * reserved_50[50] initialized
772 */
773}
774
775/* ================= main 802.3ad protocol code ========================= */
776
777/**
778 * ad_lacpdu_send - send out a lacpdu packet on a given port
779 * @port: the port we're looking at
780 *
781 * Returns: 0 on success
782 * < 0 on error
783 */
784static int ad_lacpdu_send(struct port *port)
785{
786 struct slave *slave = port->slave;
787 struct sk_buff *skb;
788 struct lacpdu_header *lacpdu_header;
789 int length = sizeof(struct lacpdu_header);
790
791 skb = dev_alloc_skb(length);
792 if (!skb)
793 return -ENOMEM;
794
795 skb->dev = slave->dev;
796 skb_reset_mac_header(skb);
797 skb->network_header = skb->mac_header + ETH_HLEN;
798 skb->protocol = PKT_TYPE_LACPDU;
799 skb->priority = TC_PRIO_CONTROL;
800
801 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
802
803 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
804 /* Note: source address is set to be the member's PERMANENT address,
805 * because we use it to identify loopback lacpdus in receive.
806 */
807 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
808 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
809
810 lacpdu_header->lacpdu = port->lacpdu;
811
812 dev_queue_xmit(skb);
813
814 return 0;
815}
816
817/**
818 * ad_marker_send - send marker information/response on a given port
819 * @port: the port we're looking at
820 * @marker: marker data to send
821 *
822 * Returns: 0 on success
823 * < 0 on error
824 */
825static int ad_marker_send(struct port *port, struct bond_marker *marker)
826{
827 struct slave *slave = port->slave;
828 struct sk_buff *skb;
829 struct bond_marker_header *marker_header;
830 int length = sizeof(struct bond_marker_header);
831
832 skb = dev_alloc_skb(length + 16);
833 if (!skb)
834 return -ENOMEM;
835
836 skb_reserve(skb, 16);
837
838 skb->dev = slave->dev;
839 skb_reset_mac_header(skb);
840 skb->network_header = skb->mac_header + ETH_HLEN;
841 skb->protocol = PKT_TYPE_LACPDU;
842
843 marker_header = (struct bond_marker_header *)skb_put(skb, length);
844
845 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
846 /* Note: source address is set to be the member's PERMANENT address,
847 * because we use it to identify loopback MARKERs in receive.
848 */
849 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
850 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
851
852 marker_header->marker = *marker;
853
854 dev_queue_xmit(skb);
855
856 return 0;
857}
858
859/**
860 * ad_mux_machine - handle a port's mux state machine
861 * @port: the port we're looking at
862 * @update_slave_arr: Does slave array need update?
863 */
864static void ad_mux_machine(struct port *port, bool *update_slave_arr)
865{
866 mux_states_t last_state;
867
868 /* keep current State Machine state to compare later if it was
869 * changed
870 */
871 last_state = port->sm_mux_state;
872
873 if (port->sm_vars & AD_PORT_BEGIN) {
874 port->sm_mux_state = AD_MUX_DETACHED;
875 } else {
876 switch (port->sm_mux_state) {
877 case AD_MUX_DETACHED:
878 if ((port->sm_vars & AD_PORT_SELECTED)
879 || (port->sm_vars & AD_PORT_STANDBY))
880 /* if SELECTED or STANDBY */
881 port->sm_mux_state = AD_MUX_WAITING;
882 break;
883 case AD_MUX_WAITING:
884 /* if SELECTED == FALSE return to DETACH state */
885 if (!(port->sm_vars & AD_PORT_SELECTED)) {
886 port->sm_vars &= ~AD_PORT_READY_N;
887 /* in order to withhold the Selection Logic to
888 * check all ports READY_N value every callback
889 * cycle to update ready variable, we check
890 * READY_N and update READY here
891 */
892 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
893 port->sm_mux_state = AD_MUX_DETACHED;
894 break;
895 }
896
897 /* check if the wait_while_timer expired */
898 if (port->sm_mux_timer_counter
899 && !(--port->sm_mux_timer_counter))
900 port->sm_vars |= AD_PORT_READY_N;
901
902 /* in order to withhold the selection logic to check
903 * all ports READY_N value every callback cycle to
904 * update ready variable, we check READY_N and update
905 * READY here
906 */
907 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
908
909 /* if the wait_while_timer expired, and the port is
910 * in READY state, move to ATTACHED state
911 */
912 if ((port->sm_vars & AD_PORT_READY)
913 && !port->sm_mux_timer_counter)
914 port->sm_mux_state = AD_MUX_ATTACHED;
915 break;
916 case AD_MUX_ATTACHED:
917 /* check also if agg_select_timer expired (so the
918 * edable port will take place only after this timer)
919 */
920 if ((port->sm_vars & AD_PORT_SELECTED) &&
921 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
922 !__check_agg_selection_timer(port)) {
923 if (port->aggregator->is_active)
924 port->sm_mux_state =
925 AD_MUX_COLLECTING_DISTRIBUTING;
926 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
927 (port->sm_vars & AD_PORT_STANDBY)) {
928 /* if UNSELECTED or STANDBY */
929 port->sm_vars &= ~AD_PORT_READY_N;
930 /* in order to withhold the selection logic to
931 * check all ports READY_N value every callback
932 * cycle to update ready variable, we check
933 * READY_N and update READY here
934 */
935 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
936 port->sm_mux_state = AD_MUX_DETACHED;
937 } else if (port->aggregator->is_active) {
938 port->actor_oper_port_state |=
939 AD_STATE_SYNCHRONIZATION;
940 }
941 break;
942 case AD_MUX_COLLECTING_DISTRIBUTING:
943 if (!(port->sm_vars & AD_PORT_SELECTED) ||
944 (port->sm_vars & AD_PORT_STANDBY) ||
945 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
946 !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
947 port->sm_mux_state = AD_MUX_ATTACHED;
948 } else {
949 /* if port state hasn't changed make
950 * sure that a collecting distributing
951 * port in an active aggregator is enabled
952 */
953 if (port->aggregator &&
954 port->aggregator->is_active &&
955 !__port_is_enabled(port)) {
956
957 __enable_port(port);
958 }
959 }
960 break;
961 default:
962 break;
963 }
964 }
965
966 /* check if the state machine was changed */
967 if (port->sm_mux_state != last_state) {
968 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
969 port->actor_port_number,
970 port->slave->dev->name,
971 last_state,
972 port->sm_mux_state);
973 switch (port->sm_mux_state) {
974 case AD_MUX_DETACHED:
975 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
976 ad_disable_collecting_distributing(port,
977 update_slave_arr);
978 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
979 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
980 port->ntt = true;
981 break;
982 case AD_MUX_WAITING:
983 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
984 break;
985 case AD_MUX_ATTACHED:
986 if (port->aggregator->is_active)
987 port->actor_oper_port_state |=
988 AD_STATE_SYNCHRONIZATION;
989 else
990 port->actor_oper_port_state &=
991 ~AD_STATE_SYNCHRONIZATION;
992 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
993 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
994 ad_disable_collecting_distributing(port,
995 update_slave_arr);
996 port->ntt = true;
997 break;
998 case AD_MUX_COLLECTING_DISTRIBUTING:
999 port->actor_oper_port_state |= AD_STATE_COLLECTING;
1000 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1001 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1002 ad_enable_collecting_distributing(port,
1003 update_slave_arr);
1004 port->ntt = true;
1005 break;
1006 default:
1007 break;
1008 }
1009 }
1010}
1011
1012/**
1013 * ad_rx_machine - handle a port's rx State Machine
1014 * @lacpdu: the lacpdu we've received
1015 * @port: the port we're looking at
1016 *
1017 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1018 * CURRENT. If timer expired set the state machine in the proper state.
1019 * In other cases, this function checks if we need to switch to other state.
1020 */
1021static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1022{
1023 rx_states_t last_state;
1024
1025 /* keep current State Machine state to compare later if it was
1026 * changed
1027 */
1028 last_state = port->sm_rx_state;
1029
1030 /* check if state machine should change state */
1031
1032 /* first, check if port was reinitialized */
1033 if (port->sm_vars & AD_PORT_BEGIN) {
1034 port->sm_rx_state = AD_RX_INITIALIZE;
1035 port->sm_vars |= AD_PORT_CHURNED;
1036 /* check if port is not enabled */
1037 } else if (!(port->sm_vars & AD_PORT_BEGIN)
1038 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1039 port->sm_rx_state = AD_RX_PORT_DISABLED;
1040 /* check if new lacpdu arrived */
1041 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1042 (port->sm_rx_state == AD_RX_DEFAULTED) ||
1043 (port->sm_rx_state == AD_RX_CURRENT))) {
1044 if (port->sm_rx_state != AD_RX_CURRENT)
1045 port->sm_vars |= AD_PORT_CHURNED;
1046 port->sm_rx_timer_counter = 0;
1047 port->sm_rx_state = AD_RX_CURRENT;
1048 } else {
1049 /* if timer is on, and if it is expired */
1050 if (port->sm_rx_timer_counter &&
1051 !(--port->sm_rx_timer_counter)) {
1052 switch (port->sm_rx_state) {
1053 case AD_RX_EXPIRED:
1054 port->sm_rx_state = AD_RX_DEFAULTED;
1055 break;
1056 case AD_RX_CURRENT:
1057 port->sm_rx_state = AD_RX_EXPIRED;
1058 break;
1059 default:
1060 break;
1061 }
1062 } else {
1063 /* if no lacpdu arrived and no timer is on */
1064 switch (port->sm_rx_state) {
1065 case AD_RX_PORT_DISABLED:
1066 if (port->sm_vars & AD_PORT_MOVED)
1067 port->sm_rx_state = AD_RX_INITIALIZE;
1068 else if (port->is_enabled
1069 && (port->sm_vars
1070 & AD_PORT_LACP_ENABLED))
1071 port->sm_rx_state = AD_RX_EXPIRED;
1072 else if (port->is_enabled
1073 && ((port->sm_vars
1074 & AD_PORT_LACP_ENABLED) == 0))
1075 port->sm_rx_state = AD_RX_LACP_DISABLED;
1076 break;
1077 default:
1078 break;
1079
1080 }
1081 }
1082 }
1083
1084 /* check if the State machine was changed or new lacpdu arrived */
1085 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1086 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1087 port->actor_port_number,
1088 port->slave->dev->name,
1089 last_state,
1090 port->sm_rx_state);
1091 switch (port->sm_rx_state) {
1092 case AD_RX_INITIALIZE:
1093 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1094 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1095 else
1096 port->sm_vars |= AD_PORT_LACP_ENABLED;
1097 port->sm_vars &= ~AD_PORT_SELECTED;
1098 __record_default(port);
1099 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1100 port->sm_vars &= ~AD_PORT_MOVED;
1101 port->sm_rx_state = AD_RX_PORT_DISABLED;
1102
1103 /* Fall Through */
1104 case AD_RX_PORT_DISABLED:
1105 port->sm_vars &= ~AD_PORT_MATCHED;
1106 break;
1107 case AD_RX_LACP_DISABLED:
1108 port->sm_vars &= ~AD_PORT_SELECTED;
1109 __record_default(port);
1110 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1111 port->sm_vars |= AD_PORT_MATCHED;
1112 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1113 break;
1114 case AD_RX_EXPIRED:
1115 /* Reset of the Synchronization flag (Standard 43.4.12)
1116 * This reset cause to disable this port in the
1117 * COLLECTING_DISTRIBUTING state of the mux machine in
1118 * case of EXPIRED even if LINK_DOWN didn't arrive for
1119 * the port.
1120 */
1121 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1122 port->sm_vars &= ~AD_PORT_MATCHED;
1123 port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1124 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1125 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1126 port->actor_oper_port_state |= AD_STATE_EXPIRED;
1127 port->sm_vars |= AD_PORT_CHURNED;
1128 break;
1129 case AD_RX_DEFAULTED:
1130 __update_default_selected(port);
1131 __record_default(port);
1132 port->sm_vars |= AD_PORT_MATCHED;
1133 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1134 break;
1135 case AD_RX_CURRENT:
1136 /* detect loopback situation */
1137 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1138 &(port->actor_system))) {
1139 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1140 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1141 port->slave->dev->name);
1142 return;
1143 }
1144 __update_selected(lacpdu, port);
1145 __update_ntt(lacpdu, port);
1146 __record_pdu(lacpdu, port);
1147 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1148 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1149 break;
1150 default:
1151 break;
1152 }
1153 }
1154}
1155
1156/**
1157 * ad_churn_machine - handle port churn's state machine
1158 * @port: the port we're looking at
1159 *
1160 */
1161static void ad_churn_machine(struct port *port)
1162{
1163 if (port->sm_vars & AD_PORT_CHURNED) {
1164 port->sm_vars &= ~AD_PORT_CHURNED;
1165 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1166 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1167 port->sm_churn_actor_timer_counter =
1168 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1169 port->sm_churn_partner_timer_counter =
1170 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1171 return;
1172 }
1173 if (port->sm_churn_actor_timer_counter &&
1174 !(--port->sm_churn_actor_timer_counter) &&
1175 port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1176 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1177 port->sm_churn_actor_state = AD_NO_CHURN;
1178 } else {
1179 port->churn_actor_count++;
1180 port->sm_churn_actor_state = AD_CHURN;
1181 }
1182 }
1183 if (port->sm_churn_partner_timer_counter &&
1184 !(--port->sm_churn_partner_timer_counter) &&
1185 port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1186 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1187 port->sm_churn_partner_state = AD_NO_CHURN;
1188 } else {
1189 port->churn_partner_count++;
1190 port->sm_churn_partner_state = AD_CHURN;
1191 }
1192 }
1193}
1194
1195/**
1196 * ad_tx_machine - handle a port's tx state machine
1197 * @port: the port we're looking at
1198 */
1199static void ad_tx_machine(struct port *port)
1200{
1201 /* check if tx timer expired, to verify that we do not send more than
1202 * 3 packets per second
1203 */
1204 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1205 /* check if there is something to send */
1206 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1207 __update_lacpdu_from_port(port);
1208
1209 if (ad_lacpdu_send(port) >= 0) {
1210 pr_debug("Sent LACPDU on port %d\n",
1211 port->actor_port_number);
1212
1213 /* mark ntt as false, so it will not be sent
1214 * again until demanded
1215 */
1216 port->ntt = false;
1217 }
1218 }
1219 /* restart tx timer(to verify that we will not exceed
1220 * AD_MAX_TX_IN_SECOND
1221 */
1222 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1223 }
1224}
1225
1226/**
1227 * ad_periodic_machine - handle a port's periodic state machine
1228 * @port: the port we're looking at
1229 *
1230 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1231 */
1232static void ad_periodic_machine(struct port *port)
1233{
1234 periodic_states_t last_state;
1235
1236 /* keep current state machine state to compare later if it was changed */
1237 last_state = port->sm_periodic_state;
1238
1239 /* check if port was reinitialized */
1240 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1241 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1242 ) {
1243 port->sm_periodic_state = AD_NO_PERIODIC;
1244 }
1245 /* check if state machine should change state */
1246 else if (port->sm_periodic_timer_counter) {
1247 /* check if periodic state machine expired */
1248 if (!(--port->sm_periodic_timer_counter)) {
1249 /* if expired then do tx */
1250 port->sm_periodic_state = AD_PERIODIC_TX;
1251 } else {
1252 /* If not expired, check if there is some new timeout
1253 * parameter from the partner state
1254 */
1255 switch (port->sm_periodic_state) {
1256 case AD_FAST_PERIODIC:
1257 if (!(port->partner_oper.port_state
1258 & AD_STATE_LACP_TIMEOUT))
1259 port->sm_periodic_state = AD_SLOW_PERIODIC;
1260 break;
1261 case AD_SLOW_PERIODIC:
1262 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1263 port->sm_periodic_timer_counter = 0;
1264 port->sm_periodic_state = AD_PERIODIC_TX;
1265 }
1266 break;
1267 default:
1268 break;
1269 }
1270 }
1271 } else {
1272 switch (port->sm_periodic_state) {
1273 case AD_NO_PERIODIC:
1274 port->sm_periodic_state = AD_FAST_PERIODIC;
1275 break;
1276 case AD_PERIODIC_TX:
1277 if (!(port->partner_oper.port_state &
1278 AD_STATE_LACP_TIMEOUT))
1279 port->sm_periodic_state = AD_SLOW_PERIODIC;
1280 else
1281 port->sm_periodic_state = AD_FAST_PERIODIC;
1282 break;
1283 default:
1284 break;
1285 }
1286 }
1287
1288 /* check if the state machine was changed */
1289 if (port->sm_periodic_state != last_state) {
1290 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1291 port->actor_port_number, last_state,
1292 port->sm_periodic_state);
1293 switch (port->sm_periodic_state) {
1294 case AD_NO_PERIODIC:
1295 port->sm_periodic_timer_counter = 0;
1296 break;
1297 case AD_FAST_PERIODIC:
1298 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1299 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1300 break;
1301 case AD_SLOW_PERIODIC:
1302 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1303 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1304 break;
1305 case AD_PERIODIC_TX:
1306 port->ntt = true;
1307 break;
1308 default:
1309 break;
1310 }
1311 }
1312}
1313
1314/**
1315 * ad_port_selection_logic - select aggregation groups
1316 * @port: the port we're looking at
1317 * @update_slave_arr: Does slave array need update?
1318 *
1319 * Select aggregation groups, and assign each port for it's aggregetor. The
1320 * selection logic is called in the inititalization (after all the handshkes),
1321 * and after every lacpdu receive (if selected is off).
1322 */
1323static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1324{
1325 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1326 struct port *last_port = NULL, *curr_port;
1327 struct list_head *iter;
1328 struct bonding *bond;
1329 struct slave *slave;
1330 int found = 0;
1331
1332 /* if the port is already Selected, do nothing */
1333 if (port->sm_vars & AD_PORT_SELECTED)
1334 return;
1335
1336 bond = __get_bond_by_port(port);
1337
1338 /* if the port is connected to other aggregator, detach it */
1339 if (port->aggregator) {
1340 /* detach the port from its former aggregator */
1341 temp_aggregator = port->aggregator;
1342 for (curr_port = temp_aggregator->lag_ports; curr_port;
1343 last_port = curr_port,
1344 curr_port = curr_port->next_port_in_aggregator) {
1345 if (curr_port == port) {
1346 temp_aggregator->num_of_ports--;
1347 /* if it is the first port attached to the
1348 * aggregator
1349 */
1350 if (!last_port) {
1351 temp_aggregator->lag_ports =
1352 port->next_port_in_aggregator;
1353 } else {
1354 /* not the first port attached to the
1355 * aggregator
1356 */
1357 last_port->next_port_in_aggregator =
1358 port->next_port_in_aggregator;
1359 }
1360
1361 /* clear the port's relations to this
1362 * aggregator
1363 */
1364 port->aggregator = NULL;
1365 port->next_port_in_aggregator = NULL;
1366 port->actor_port_aggregator_identifier = 0;
1367
1368 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1369 port->actor_port_number,
1370 temp_aggregator->aggregator_identifier);
1371 /* if the aggregator is empty, clear its
1372 * parameters, and set it ready to be attached
1373 */
1374 if (!temp_aggregator->lag_ports)
1375 ad_clear_agg(temp_aggregator);
1376 break;
1377 }
1378 }
1379 if (!curr_port) {
1380 /* meaning: the port was related to an aggregator
1381 * but was not on the aggregator port list
1382 */
1383 net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1384 port->slave->bond->dev->name,
1385 port->actor_port_number,
1386 port->slave->dev->name,
1387 port->aggregator->aggregator_identifier);
1388 }
1389 }
1390 /* search on all aggregators for a suitable aggregator for this port */
1391 bond_for_each_slave(bond, slave, iter) {
1392 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1393
1394 /* keep a free aggregator for later use(if needed) */
1395 if (!aggregator->lag_ports) {
1396 if (!free_aggregator)
1397 free_aggregator = aggregator;
1398 continue;
1399 }
1400 /* check if current aggregator suits us */
1401 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1402 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1403 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1404 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1405 ) &&
1406 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1407 !aggregator->is_individual) /* but is not individual OR */
1408 )
1409 ) {
1410 /* attach to the founded aggregator */
1411 port->aggregator = aggregator;
1412 port->actor_port_aggregator_identifier =
1413 port->aggregator->aggregator_identifier;
1414 port->next_port_in_aggregator = aggregator->lag_ports;
1415 port->aggregator->num_of_ports++;
1416 aggregator->lag_ports = port;
1417 netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1418 port->actor_port_number,
1419 port->aggregator->aggregator_identifier);
1420
1421 /* mark this port as selected */
1422 port->sm_vars |= AD_PORT_SELECTED;
1423 found = 1;
1424 break;
1425 }
1426 }
1427
1428 /* the port couldn't find an aggregator - attach it to a new
1429 * aggregator
1430 */
1431 if (!found) {
1432 if (free_aggregator) {
1433 /* assign port a new aggregator */
1434 port->aggregator = free_aggregator;
1435 port->actor_port_aggregator_identifier =
1436 port->aggregator->aggregator_identifier;
1437
1438 /* update the new aggregator's parameters
1439 * if port was responsed from the end-user
1440 */
1441 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1442 /* if port is full duplex */
1443 port->aggregator->is_individual = false;
1444 else
1445 port->aggregator->is_individual = true;
1446
1447 port->aggregator->actor_admin_aggregator_key =
1448 port->actor_admin_port_key;
1449 port->aggregator->actor_oper_aggregator_key =
1450 port->actor_oper_port_key;
1451 port->aggregator->partner_system =
1452 port->partner_oper.system;
1453 port->aggregator->partner_system_priority =
1454 port->partner_oper.system_priority;
1455 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1456 port->aggregator->receive_state = 1;
1457 port->aggregator->transmit_state = 1;
1458 port->aggregator->lag_ports = port;
1459 port->aggregator->num_of_ports++;
1460
1461 /* mark this port as selected */
1462 port->sm_vars |= AD_PORT_SELECTED;
1463
1464 netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1465 port->actor_port_number,
1466 port->aggregator->aggregator_identifier);
1467 } else {
1468 netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1469 port->actor_port_number, port->slave->dev->name);
1470 }
1471 }
1472 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1473 * in all aggregator's ports, else set ready=FALSE in all
1474 * aggregator's ports
1475 */
1476 __set_agg_ports_ready(port->aggregator,
1477 __agg_ports_are_ready(port->aggregator));
1478
1479 aggregator = __get_first_agg(port);
1480 ad_agg_selection_logic(aggregator, update_slave_arr);
1481
1482 if (!port->aggregator->is_active)
1483 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1484}
1485
1486/* Decide if "agg" is a better choice for the new active aggregator that
1487 * the current best, according to the ad_select policy.
1488 */
1489static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1490 struct aggregator *curr)
1491{
1492 /* 0. If no best, select current.
1493 *
1494 * 1. If the current agg is not individual, and the best is
1495 * individual, select current.
1496 *
1497 * 2. If current agg is individual and the best is not, keep best.
1498 *
1499 * 3. Therefore, current and best are both individual or both not
1500 * individual, so:
1501 *
1502 * 3a. If current agg partner replied, and best agg partner did not,
1503 * select current.
1504 *
1505 * 3b. If current agg partner did not reply and best agg partner
1506 * did reply, keep best.
1507 *
1508 * 4. Therefore, current and best both have partner replies or
1509 * both do not, so perform selection policy:
1510 *
1511 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1512 * select by bandwidth.
1513 *
1514 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1515 */
1516 if (!best)
1517 return curr;
1518
1519 if (!curr->is_individual && best->is_individual)
1520 return curr;
1521
1522 if (curr->is_individual && !best->is_individual)
1523 return best;
1524
1525 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1526 return curr;
1527
1528 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1529 return best;
1530
1531 switch (__get_agg_selection_mode(curr->lag_ports)) {
1532 case BOND_AD_COUNT:
1533 if (curr->num_of_ports > best->num_of_ports)
1534 return curr;
1535
1536 if (curr->num_of_ports < best->num_of_ports)
1537 return best;
1538
1539 /*FALLTHROUGH*/
1540 case BOND_AD_STABLE:
1541 case BOND_AD_BANDWIDTH:
1542 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1543 return curr;
1544
1545 break;
1546
1547 default:
1548 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1549 curr->slave->bond->dev->name,
1550 __get_agg_selection_mode(curr->lag_ports));
1551 break;
1552 }
1553
1554 return best;
1555}
1556
1557static int agg_device_up(const struct aggregator *agg)
1558{
1559 struct port *port = agg->lag_ports;
1560
1561 if (!port)
1562 return 0;
1563
1564 return netif_running(port->slave->dev) &&
1565 netif_carrier_ok(port->slave->dev);
1566}
1567
1568/**
1569 * ad_agg_selection_logic - select an aggregation group for a team
1570 * @aggregator: the aggregator we're looking at
1571 * @update_slave_arr: Does slave array need update?
1572 *
1573 * It is assumed that only one aggregator may be selected for a team.
1574 *
1575 * The logic of this function is to select the aggregator according to
1576 * the ad_select policy:
1577 *
1578 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1579 * it, and to reselect the active aggregator only if the previous
1580 * aggregator has no more ports related to it.
1581 *
1582 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1583 * bandwidth, and reselect whenever a link state change takes place or the
1584 * set of slaves in the bond changes.
1585 *
1586 * BOND_AD_COUNT: select the aggregator with largest number of ports
1587 * (slaves), and reselect whenever a link state change takes place or the
1588 * set of slaves in the bond changes.
1589 *
1590 * FIXME: this function MUST be called with the first agg in the bond, or
1591 * __get_active_agg() won't work correctly. This function should be better
1592 * called with the bond itself, and retrieve the first agg from it.
1593 */
1594static void ad_agg_selection_logic(struct aggregator *agg,
1595 bool *update_slave_arr)
1596{
1597 struct aggregator *best, *active, *origin;
1598 struct bonding *bond = agg->slave->bond;
1599 struct list_head *iter;
1600 struct slave *slave;
1601 struct port *port;
1602
1603 rcu_read_lock();
1604 origin = agg;
1605 active = __get_active_agg(agg);
1606 best = (active && agg_device_up(active)) ? active : NULL;
1607
1608 bond_for_each_slave_rcu(bond, slave, iter) {
1609 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1610
1611 agg->is_active = 0;
1612
1613 if (agg->num_of_ports && agg_device_up(agg))
1614 best = ad_agg_selection_test(best, agg);
1615 }
1616
1617 if (best &&
1618 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1619 /* For the STABLE policy, don't replace the old active
1620 * aggregator if it's still active (it has an answering
1621 * partner) or if both the best and active don't have an
1622 * answering partner.
1623 */
1624 if (active && active->lag_ports &&
1625 active->lag_ports->is_enabled &&
1626 (__agg_has_partner(active) ||
1627 (!__agg_has_partner(active) &&
1628 !__agg_has_partner(best)))) {
1629 if (!(!active->actor_oper_aggregator_key &&
1630 best->actor_oper_aggregator_key)) {
1631 best = NULL;
1632 active->is_active = 1;
1633 }
1634 }
1635 }
1636
1637 if (best && (best == active)) {
1638 best = NULL;
1639 active->is_active = 1;
1640 }
1641
1642 /* if there is new best aggregator, activate it */
1643 if (best) {
1644 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1645 best->aggregator_identifier, best->num_of_ports,
1646 best->actor_oper_aggregator_key,
1647 best->partner_oper_aggregator_key,
1648 best->is_individual, best->is_active);
1649 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1650 best->lag_ports, best->slave,
1651 best->slave ? best->slave->dev->name : "NULL");
1652
1653 bond_for_each_slave_rcu(bond, slave, iter) {
1654 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1655
1656 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1657 agg->aggregator_identifier, agg->num_of_ports,
1658 agg->actor_oper_aggregator_key,
1659 agg->partner_oper_aggregator_key,
1660 agg->is_individual, agg->is_active);
1661 }
1662
1663 /* check if any partner replys */
1664 if (best->is_individual) {
1665 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1666 best->slave ?
1667 best->slave->bond->dev->name : "NULL");
1668 }
1669
1670 best->is_active = 1;
1671 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1672 best->aggregator_identifier);
1673 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1674 best->aggregator_identifier, best->num_of_ports,
1675 best->actor_oper_aggregator_key,
1676 best->partner_oper_aggregator_key,
1677 best->is_individual, best->is_active);
1678
1679 /* disable the ports that were related to the former
1680 * active_aggregator
1681 */
1682 if (active) {
1683 for (port = active->lag_ports; port;
1684 port = port->next_port_in_aggregator) {
1685 __disable_port(port);
1686 }
1687 }
1688 /* Slave array needs update. */
1689 *update_slave_arr = true;
1690 }
1691
1692 /* if the selected aggregator is of join individuals
1693 * (partner_system is NULL), enable their ports
1694 */
1695 active = __get_active_agg(origin);
1696
1697 if (active) {
1698 if (!__agg_has_partner(active)) {
1699 for (port = active->lag_ports; port;
1700 port = port->next_port_in_aggregator) {
1701 __enable_port(port);
1702 }
1703 }
1704 }
1705
1706 rcu_read_unlock();
1707
1708 bond_3ad_set_carrier(bond);
1709}
1710
1711/**
1712 * ad_clear_agg - clear a given aggregator's parameters
1713 * @aggregator: the aggregator we're looking at
1714 */
1715static void ad_clear_agg(struct aggregator *aggregator)
1716{
1717 if (aggregator) {
1718 aggregator->is_individual = false;
1719 aggregator->actor_admin_aggregator_key = 0;
1720 aggregator->actor_oper_aggregator_key = 0;
1721 aggregator->partner_system = null_mac_addr;
1722 aggregator->partner_system_priority = 0;
1723 aggregator->partner_oper_aggregator_key = 0;
1724 aggregator->receive_state = 0;
1725 aggregator->transmit_state = 0;
1726 aggregator->lag_ports = NULL;
1727 aggregator->is_active = 0;
1728 aggregator->num_of_ports = 0;
1729 pr_debug("LAG %d was cleared\n",
1730 aggregator->aggregator_identifier);
1731 }
1732}
1733
1734/**
1735 * ad_initialize_agg - initialize a given aggregator's parameters
1736 * @aggregator: the aggregator we're looking at
1737 */
1738static void ad_initialize_agg(struct aggregator *aggregator)
1739{
1740 if (aggregator) {
1741 ad_clear_agg(aggregator);
1742
1743 aggregator->aggregator_mac_address = null_mac_addr;
1744 aggregator->aggregator_identifier = 0;
1745 aggregator->slave = NULL;
1746 }
1747}
1748
1749/**
1750 * ad_initialize_port - initialize a given port's parameters
1751 * @aggregator: the aggregator we're looking at
1752 * @lacp_fast: boolean. whether fast periodic should be used
1753 */
1754static void ad_initialize_port(struct port *port, int lacp_fast)
1755{
1756 static const struct port_params tmpl = {
1757 .system_priority = 0xffff,
1758 .key = 1,
1759 .port_number = 1,
1760 .port_priority = 0xff,
1761 .port_state = 1,
1762 };
1763 static const struct lacpdu lacpdu = {
1764 .subtype = 0x01,
1765 .version_number = 0x01,
1766 .tlv_type_actor_info = 0x01,
1767 .actor_information_length = 0x14,
1768 .tlv_type_partner_info = 0x02,
1769 .partner_information_length = 0x14,
1770 .tlv_type_collector_info = 0x03,
1771 .collector_information_length = 0x10,
1772 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1773 };
1774
1775 if (port) {
1776 port->actor_port_priority = 0xff;
1777 port->actor_port_aggregator_identifier = 0;
1778 port->ntt = false;
1779 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1780 AD_STATE_LACP_ACTIVITY;
1781 port->actor_oper_port_state = AD_STATE_AGGREGATION |
1782 AD_STATE_LACP_ACTIVITY;
1783
1784 if (lacp_fast)
1785 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1786
1787 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1788 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1789
1790 port->is_enabled = true;
1791 /* private parameters */
1792 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1793 port->sm_rx_state = 0;
1794 port->sm_rx_timer_counter = 0;
1795 port->sm_periodic_state = 0;
1796 port->sm_periodic_timer_counter = 0;
1797 port->sm_mux_state = 0;
1798 port->sm_mux_timer_counter = 0;
1799 port->sm_tx_state = 0;
1800 port->aggregator = NULL;
1801 port->next_port_in_aggregator = NULL;
1802 port->transaction_id = 0;
1803
1804 port->sm_churn_actor_timer_counter = 0;
1805 port->sm_churn_actor_state = 0;
1806 port->churn_actor_count = 0;
1807 port->sm_churn_partner_timer_counter = 0;
1808 port->sm_churn_partner_state = 0;
1809 port->churn_partner_count = 0;
1810
1811 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1812 }
1813}
1814
1815/**
1816 * ad_enable_collecting_distributing - enable a port's transmit/receive
1817 * @port: the port we're looking at
1818 * @update_slave_arr: Does slave array need update?
1819 *
1820 * Enable @port if it's in an active aggregator
1821 */
1822static void ad_enable_collecting_distributing(struct port *port,
1823 bool *update_slave_arr)
1824{
1825 if (port->aggregator->is_active) {
1826 pr_debug("Enabling port %d(LAG %d)\n",
1827 port->actor_port_number,
1828 port->aggregator->aggregator_identifier);
1829 __enable_port(port);
1830 /* Slave array needs update */
1831 *update_slave_arr = true;
1832 }
1833}
1834
1835/**
1836 * ad_disable_collecting_distributing - disable a port's transmit/receive
1837 * @port: the port we're looking at
1838 * @update_slave_arr: Does slave array need update?
1839 */
1840static void ad_disable_collecting_distributing(struct port *port,
1841 bool *update_slave_arr)
1842{
1843 if (port->aggregator &&
1844 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1845 &(null_mac_addr))) {
1846 pr_debug("Disabling port %d(LAG %d)\n",
1847 port->actor_port_number,
1848 port->aggregator->aggregator_identifier);
1849 __disable_port(port);
1850 /* Slave array needs an update */
1851 *update_slave_arr = true;
1852 }
1853}
1854
1855/**
1856 * ad_marker_info_received - handle receive of a Marker information frame
1857 * @marker_info: Marker info received
1858 * @port: the port we're looking at
1859 */
1860static void ad_marker_info_received(struct bond_marker *marker_info,
1861 struct port *port)
1862{
1863 struct bond_marker marker;
1864
1865 /* copy the received marker data to the response marker */
1866 memcpy(&marker, marker_info, sizeof(struct bond_marker));
1867 /* change the marker subtype to marker response */
1868 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1869
1870 /* send the marker response */
1871 if (ad_marker_send(port, &marker) >= 0) {
1872 pr_debug("Sent Marker Response on port %d\n",
1873 port->actor_port_number);
1874 }
1875}
1876
1877/**
1878 * ad_marker_response_received - handle receive of a marker response frame
1879 * @marker: marker PDU received
1880 * @port: the port we're looking at
1881 *
1882 * This function does nothing since we decided not to implement send and handle
1883 * response for marker PDU's, in this stage, but only to respond to marker
1884 * information.
1885 */
1886static void ad_marker_response_received(struct bond_marker *marker,
1887 struct port *port)
1888{
1889 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1890}
1891
1892/* ========= AD exported functions to the main bonding code ========= */
1893
1894/* Check aggregators status in team every T seconds */
1895#define AD_AGGREGATOR_SELECTION_TIMER 8
1896
1897/**
1898 * bond_3ad_initiate_agg_selection - initate aggregator selection
1899 * @bond: bonding struct
1900 *
1901 * Set the aggregation selection timer, to initiate an agg selection in
1902 * the very near future. Called during first initialization, and during
1903 * any down to up transitions of the bond.
1904 */
1905void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1906{
1907 BOND_AD_INFO(bond).agg_select_timer = timeout;
1908}
1909
1910/**
1911 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1912 * @bond: bonding struct to work on
1913 * @tick_resolution: tick duration (millisecond resolution)
1914 *
1915 * Can be called only after the mac address of the bond is set.
1916 */
1917void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1918{
1919 /* check that the bond is not initialized yet */
1920 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1921 bond->dev->dev_addr)) {
1922
1923 BOND_AD_INFO(bond).aggregator_identifier = 0;
1924
1925 BOND_AD_INFO(bond).system.sys_priority =
1926 bond->params.ad_actor_sys_prio;
1927 if (is_zero_ether_addr(bond->params.ad_actor_system))
1928 BOND_AD_INFO(bond).system.sys_mac_addr =
1929 *((struct mac_addr *)bond->dev->dev_addr);
1930 else
1931 BOND_AD_INFO(bond).system.sys_mac_addr =
1932 *((struct mac_addr *)bond->params.ad_actor_system);
1933
1934 /* initialize how many times this module is called in one
1935 * second (should be about every 100ms)
1936 */
1937 ad_ticks_per_sec = tick_resolution;
1938
1939 bond_3ad_initiate_agg_selection(bond,
1940 AD_AGGREGATOR_SELECTION_TIMER *
1941 ad_ticks_per_sec);
1942 }
1943}
1944
1945/**
1946 * bond_3ad_bind_slave - initialize a slave's port
1947 * @slave: slave struct to work on
1948 *
1949 * Returns: 0 on success
1950 * < 0 on error
1951 */
1952void bond_3ad_bind_slave(struct slave *slave)
1953{
1954 struct bonding *bond = bond_get_bond_by_slave(slave);
1955 struct port *port;
1956 struct aggregator *aggregator;
1957
1958 /* check that the slave has not been initialized yet. */
1959 if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1960
1961 /* port initialization */
1962 port = &(SLAVE_AD_INFO(slave)->port);
1963
1964 ad_initialize_port(port, bond->params.lacp_fast);
1965
1966 port->slave = slave;
1967 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
1968 /* key is determined according to the link speed, duplex and
1969 * user key
1970 */
1971 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
1972 ad_update_actor_keys(port, false);
1973 /* actor system is the bond's system */
1974 __ad_actor_update_port(port);
1975 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1976 * lacpdu's are sent in one second)
1977 */
1978 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1979
1980 __disable_port(port);
1981
1982 /* aggregator initialization */
1983 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1984
1985 ad_initialize_agg(aggregator);
1986
1987 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1988 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1989 aggregator->slave = slave;
1990 aggregator->is_active = 0;
1991 aggregator->num_of_ports = 0;
1992 }
1993}
1994
1995/**
1996 * bond_3ad_unbind_slave - deinitialize a slave's port
1997 * @slave: slave struct to work on
1998 *
1999 * Search for the aggregator that is related to this port, remove the
2000 * aggregator and assign another aggregator for other port related to it
2001 * (if any), and remove the port.
2002 */
2003void bond_3ad_unbind_slave(struct slave *slave)
2004{
2005 struct port *port, *prev_port, *temp_port;
2006 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2007 int select_new_active_agg = 0;
2008 struct bonding *bond = slave->bond;
2009 struct slave *slave_iter;
2010 struct list_head *iter;
2011 bool dummy_slave_update; /* Ignore this value as caller updates array */
2012
2013 /* Sync against bond_3ad_state_machine_handler() */
2014 spin_lock_bh(&bond->mode_lock);
2015 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2016 port = &(SLAVE_AD_INFO(slave)->port);
2017
2018 /* if slave is null, the whole port is not initialized */
2019 if (!port->slave) {
2020 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
2021 slave->dev->name);
2022 goto out;
2023 }
2024
2025 netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
2026 aggregator->aggregator_identifier);
2027
2028 /* Tell the partner that this port is not suitable for aggregation */
2029 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2030 __update_lacpdu_from_port(port);
2031 ad_lacpdu_send(port);
2032
2033 /* check if this aggregator is occupied */
2034 if (aggregator->lag_ports) {
2035 /* check if there are other ports related to this aggregator
2036 * except the port related to this slave(thats ensure us that
2037 * there is a reason to search for new aggregator, and that we
2038 * will find one
2039 */
2040 if ((aggregator->lag_ports != port) ||
2041 (aggregator->lag_ports->next_port_in_aggregator)) {
2042 /* find new aggregator for the related port(s) */
2043 bond_for_each_slave(bond, slave_iter, iter) {
2044 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2045 /* if the new aggregator is empty, or it is
2046 * connected to our port only
2047 */
2048 if (!new_aggregator->lag_ports ||
2049 ((new_aggregator->lag_ports == port) &&
2050 !new_aggregator->lag_ports->next_port_in_aggregator))
2051 break;
2052 }
2053 if (!slave_iter)
2054 new_aggregator = NULL;
2055
2056 /* if new aggregator found, copy the aggregator's
2057 * parameters and connect the related lag_ports to the
2058 * new aggregator
2059 */
2060 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2061 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2062 aggregator->aggregator_identifier,
2063 new_aggregator->aggregator_identifier);
2064
2065 if ((new_aggregator->lag_ports == port) &&
2066 new_aggregator->is_active) {
2067 netdev_info(bond->dev, "Removing an active aggregator\n");
2068 select_new_active_agg = 1;
2069 }
2070
2071 new_aggregator->is_individual = aggregator->is_individual;
2072 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2073 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2074 new_aggregator->partner_system = aggregator->partner_system;
2075 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2076 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2077 new_aggregator->receive_state = aggregator->receive_state;
2078 new_aggregator->transmit_state = aggregator->transmit_state;
2079 new_aggregator->lag_ports = aggregator->lag_ports;
2080 new_aggregator->is_active = aggregator->is_active;
2081 new_aggregator->num_of_ports = aggregator->num_of_ports;
2082
2083 /* update the information that is written on
2084 * the ports about the aggregator
2085 */
2086 for (temp_port = aggregator->lag_ports; temp_port;
2087 temp_port = temp_port->next_port_in_aggregator) {
2088 temp_port->aggregator = new_aggregator;
2089 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2090 }
2091
2092 ad_clear_agg(aggregator);
2093
2094 if (select_new_active_agg)
2095 ad_agg_selection_logic(__get_first_agg(port),
2096 &dummy_slave_update);
2097 } else {
2098 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2099 }
2100 } else {
2101 /* in case that the only port related to this
2102 * aggregator is the one we want to remove
2103 */
2104 select_new_active_agg = aggregator->is_active;
2105 ad_clear_agg(aggregator);
2106 if (select_new_active_agg) {
2107 netdev_info(bond->dev, "Removing an active aggregator\n");
2108 /* select new active aggregator */
2109 temp_aggregator = __get_first_agg(port);
2110 if (temp_aggregator)
2111 ad_agg_selection_logic(temp_aggregator,
2112 &dummy_slave_update);
2113 }
2114 }
2115 }
2116
2117 netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
2118
2119 /* find the aggregator that this port is connected to */
2120 bond_for_each_slave(bond, slave_iter, iter) {
2121 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2122 prev_port = NULL;
2123 /* search the port in the aggregator's related ports */
2124 for (temp_port = temp_aggregator->lag_ports; temp_port;
2125 prev_port = temp_port,
2126 temp_port = temp_port->next_port_in_aggregator) {
2127 if (temp_port == port) {
2128 /* the aggregator found - detach the port from
2129 * this aggregator
2130 */
2131 if (prev_port)
2132 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2133 else
2134 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2135 temp_aggregator->num_of_ports--;
2136 if (temp_aggregator->num_of_ports == 0) {
2137 select_new_active_agg = temp_aggregator->is_active;
2138 ad_clear_agg(temp_aggregator);
2139 if (select_new_active_agg) {
2140 netdev_info(bond->dev, "Removing an active aggregator\n");
2141 /* select new active aggregator */
2142 ad_agg_selection_logic(__get_first_agg(port),
2143 &dummy_slave_update);
2144 }
2145 }
2146 break;
2147 }
2148 }
2149 }
2150 port->slave = NULL;
2151
2152out:
2153 spin_unlock_bh(&bond->mode_lock);
2154}
2155
2156/**
2157 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2158 * @bond: bonding struct to work on
2159 *
2160 * If an ad_actor setting gets changed we need to update the individual port
2161 * settings so the bond device will use the new values when it gets upped.
2162 */
2163void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2164{
2165 struct list_head *iter;
2166 struct slave *slave;
2167
2168 ASSERT_RTNL();
2169
2170 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2171 if (is_zero_ether_addr(bond->params.ad_actor_system))
2172 BOND_AD_INFO(bond).system.sys_mac_addr =
2173 *((struct mac_addr *)bond->dev->dev_addr);
2174 else
2175 BOND_AD_INFO(bond).system.sys_mac_addr =
2176 *((struct mac_addr *)bond->params.ad_actor_system);
2177
2178 spin_lock_bh(&bond->mode_lock);
2179 bond_for_each_slave(bond, slave, iter) {
2180 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2181
2182 __ad_actor_update_port(port);
2183 port->ntt = true;
2184 }
2185 spin_unlock_bh(&bond->mode_lock);
2186}
2187
2188/**
2189 * bond_3ad_state_machine_handler - handle state machines timeout
2190 * @bond: bonding struct to work on
2191 *
2192 * The state machine handling concept in this module is to check every tick
2193 * which state machine should operate any function. The execution order is
2194 * round robin, so when we have an interaction between state machines, the
2195 * reply of one to each other might be delayed until next tick.
2196 *
2197 * This function also complete the initialization when the agg_select_timer
2198 * times out, and it selects an aggregator for the ports that are yet not
2199 * related to any aggregator, and selects the active aggregator for a bond.
2200 */
2201void bond_3ad_state_machine_handler(struct work_struct *work)
2202{
2203 struct bonding *bond = container_of(work, struct bonding,
2204 ad_work.work);
2205 struct aggregator *aggregator;
2206 struct list_head *iter;
2207 struct slave *slave;
2208 struct port *port;
2209 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2210 bool update_slave_arr = false;
2211
2212 /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2213 * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2214 * concurrently due to incoming LACPDU as well.
2215 */
2216 spin_lock_bh(&bond->mode_lock);
2217 rcu_read_lock();
2218
2219 /* check if there are any slaves */
2220 if (!bond_has_slaves(bond))
2221 goto re_arm;
2222
2223 /* check if agg_select_timer timer after initialize is timed out */
2224 if (BOND_AD_INFO(bond).agg_select_timer &&
2225 !(--BOND_AD_INFO(bond).agg_select_timer)) {
2226 slave = bond_first_slave_rcu(bond);
2227 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2228
2229 /* select the active aggregator for the bond */
2230 if (port) {
2231 if (!port->slave) {
2232 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2233 bond->dev->name);
2234 goto re_arm;
2235 }
2236
2237 aggregator = __get_first_agg(port);
2238 ad_agg_selection_logic(aggregator, &update_slave_arr);
2239 }
2240 bond_3ad_set_carrier(bond);
2241 }
2242
2243 /* for each port run the state machines */
2244 bond_for_each_slave_rcu(bond, slave, iter) {
2245 port = &(SLAVE_AD_INFO(slave)->port);
2246 if (!port->slave) {
2247 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2248 bond->dev->name);
2249 goto re_arm;
2250 }
2251
2252 ad_rx_machine(NULL, port);
2253 ad_periodic_machine(port);
2254 ad_port_selection_logic(port, &update_slave_arr);
2255 ad_mux_machine(port, &update_slave_arr);
2256 ad_tx_machine(port);
2257 ad_churn_machine(port);
2258
2259 /* turn off the BEGIN bit, since we already handled it */
2260 if (port->sm_vars & AD_PORT_BEGIN)
2261 port->sm_vars &= ~AD_PORT_BEGIN;
2262 }
2263
2264re_arm:
2265 bond_for_each_slave_rcu(bond, slave, iter) {
2266 if (slave->should_notify) {
2267 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2268 break;
2269 }
2270 }
2271 rcu_read_unlock();
2272 spin_unlock_bh(&bond->mode_lock);
2273
2274 if (update_slave_arr)
2275 bond_slave_arr_work_rearm(bond, 0);
2276
2277 if (should_notify_rtnl && rtnl_trylock()) {
2278 bond_slave_state_notify(bond);
2279 rtnl_unlock();
2280 }
2281 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2282}
2283
2284/**
2285 * bond_3ad_rx_indication - handle a received frame
2286 * @lacpdu: received lacpdu
2287 * @slave: slave struct to work on
2288 * @length: length of the data received
2289 *
2290 * It is assumed that frames that were sent on this NIC don't returned as new
2291 * received frames (loopback). Since only the payload is given to this
2292 * function, it check for loopback.
2293 */
2294static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2295 u16 length)
2296{
2297 struct port *port;
2298 int ret = RX_HANDLER_ANOTHER;
2299
2300 if (length >= sizeof(struct lacpdu)) {
2301
2302 port = &(SLAVE_AD_INFO(slave)->port);
2303
2304 if (!port->slave) {
2305 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2306 slave->dev->name, slave->bond->dev->name);
2307 return ret;
2308 }
2309
2310 switch (lacpdu->subtype) {
2311 case AD_TYPE_LACPDU:
2312 ret = RX_HANDLER_CONSUMED;
2313 netdev_dbg(slave->bond->dev,
2314 "Received LACPDU on port %d slave %s\n",
2315 port->actor_port_number,
2316 slave->dev->name);
2317 /* Protect against concurrent state machines */
2318 spin_lock(&slave->bond->mode_lock);
2319 ad_rx_machine(lacpdu, port);
2320 spin_unlock(&slave->bond->mode_lock);
2321 break;
2322
2323 case AD_TYPE_MARKER:
2324 ret = RX_HANDLER_CONSUMED;
2325 /* No need to convert fields to Little Endian since we
2326 * don't use the marker's fields.
2327 */
2328
2329 switch (((struct bond_marker *)lacpdu)->tlv_type) {
2330 case AD_MARKER_INFORMATION_SUBTYPE:
2331 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2332 port->actor_port_number);
2333 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2334 break;
2335
2336 case AD_MARKER_RESPONSE_SUBTYPE:
2337 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2338 port->actor_port_number);
2339 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2340 break;
2341
2342 default:
2343 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2344 port->actor_port_number);
2345 }
2346 }
2347 }
2348 return ret;
2349}
2350
2351/**
2352 * ad_update_actor_keys - Update the oper / admin keys for a port based on
2353 * its current speed and duplex settings.
2354 *
2355 * @port: the port we'are looking at
2356 * @reset: Boolean to just reset the speed and the duplex part of the key
2357 *
2358 * The logic to change the oper / admin keys is:
2359 * (a) A full duplex port can participate in LACP with partner.
2360 * (b) When the speed is changed, LACP need to be reinitiated.
2361 */
2362static void ad_update_actor_keys(struct port *port, bool reset)
2363{
2364 u8 duplex = 0;
2365 u16 ospeed = 0, speed = 0;
2366 u16 old_oper_key = port->actor_oper_port_key;
2367
2368 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2369 if (!reset) {
2370 speed = __get_link_speed(port);
2371 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2372 duplex = __get_duplex(port);
2373 port->actor_admin_port_key |= (speed << 1) | duplex;
2374 }
2375 port->actor_oper_port_key = port->actor_admin_port_key;
2376
2377 if (old_oper_key != port->actor_oper_port_key) {
2378 /* Only 'duplex' port participates in LACP */
2379 if (duplex)
2380 port->sm_vars |= AD_PORT_LACP_ENABLED;
2381 else
2382 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2383
2384 if (!reset) {
2385 if (!speed) {
2386 netdev_err(port->slave->dev,
2387 "speed changed to 0 for port %s",
2388 port->slave->dev->name);
2389 } else if (duplex && ospeed != speed) {
2390 /* Speed change restarts LACP state-machine */
2391 port->sm_vars |= AD_PORT_BEGIN;
2392 }
2393 }
2394 }
2395}
2396
2397/**
2398 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2399 * change indication
2400 *
2401 * @slave: slave struct to work on
2402 *
2403 * Handle reselection of aggregator (if needed) for this port.
2404 */
2405void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2406{
2407 struct port *port;
2408
2409 port = &(SLAVE_AD_INFO(slave)->port);
2410
2411 /* if slave is null, the whole port is not initialized */
2412 if (!port->slave) {
2413 netdev_warn(slave->bond->dev,
2414 "speed/duplex changed for uninitialized port %s\n",
2415 slave->dev->name);
2416 return;
2417 }
2418
2419 spin_lock_bh(&slave->bond->mode_lock);
2420 ad_update_actor_keys(port, false);
2421 netdev_dbg(slave->bond->dev, "Port %d slave %s changed speed/duplex\n",
2422 port->actor_port_number, slave->dev->name);
2423 spin_unlock_bh(&slave->bond->mode_lock);
2424}
2425
2426/**
2427 * bond_3ad_handle_link_change - handle a slave's link status change indication
2428 * @slave: slave struct to work on
2429 * @status: whether the link is now up or down
2430 *
2431 * Handle reselection of aggregator (if needed) for this port.
2432 */
2433void bond_3ad_handle_link_change(struct slave *slave, char link)
2434{
2435 struct port *port;
2436
2437 port = &(SLAVE_AD_INFO(slave)->port);
2438
2439 /* if slave is null, the whole port is not initialized */
2440 if (!port->slave) {
2441 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2442 slave->dev->name);
2443 return;
2444 }
2445
2446 spin_lock_bh(&slave->bond->mode_lock);
2447 /* on link down we are zeroing duplex and speed since
2448 * some of the adaptors(ce1000.lan) report full duplex/speed
2449 * instead of N/A(duplex) / 0(speed).
2450 *
2451 * on link up we are forcing recheck on the duplex and speed since
2452 * some of he adaptors(ce1000.lan) report.
2453 */
2454 if (link == BOND_LINK_UP) {
2455 port->is_enabled = true;
2456 ad_update_actor_keys(port, false);
2457 } else {
2458 /* link has failed */
2459 port->is_enabled = false;
2460 ad_update_actor_keys(port, true);
2461 }
2462 netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2463 port->actor_port_number,
2464 link == BOND_LINK_UP ? "UP" : "DOWN");
2465
2466 spin_unlock_bh(&slave->bond->mode_lock);
2467
2468 /* RTNL is held and mode_lock is released so it's safe
2469 * to update slave_array here.
2470 */
2471 bond_update_slave_arr(slave->bond, NULL);
2472}
2473
2474/**
2475 * bond_3ad_set_carrier - set link state for bonding master
2476 * @bond - bonding structure
2477 *
2478 * if we have an active aggregator, we're up, if not, we're down.
2479 * Presumes that we cannot have an active aggregator if there are
2480 * no slaves with link up.
2481 *
2482 * This behavior complies with IEEE 802.3 section 43.3.9.
2483 *
2484 * Called by bond_set_carrier(). Return zero if carrier state does not
2485 * change, nonzero if it does.
2486 */
2487int bond_3ad_set_carrier(struct bonding *bond)
2488{
2489 struct aggregator *active;
2490 struct slave *first_slave;
2491 int ret = 1;
2492
2493 rcu_read_lock();
2494 first_slave = bond_first_slave_rcu(bond);
2495 if (!first_slave) {
2496 ret = 0;
2497 goto out;
2498 }
2499 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2500 if (active) {
2501 /* are enough slaves available to consider link up? */
2502 if (active->num_of_ports < bond->params.min_links) {
2503 if (netif_carrier_ok(bond->dev)) {
2504 netif_carrier_off(bond->dev);
2505 goto out;
2506 }
2507 } else if (!netif_carrier_ok(bond->dev)) {
2508 netif_carrier_on(bond->dev);
2509 goto out;
2510 }
2511 } else if (netif_carrier_ok(bond->dev)) {
2512 netif_carrier_off(bond->dev);
2513 }
2514out:
2515 rcu_read_unlock();
2516 return ret;
2517}
2518
2519/**
2520 * __bond_3ad_get_active_agg_info - get information of the active aggregator
2521 * @bond: bonding struct to work on
2522 * @ad_info: ad_info struct to fill with the bond's info
2523 *
2524 * Returns: 0 on success
2525 * < 0 on error
2526 */
2527int __bond_3ad_get_active_agg_info(struct bonding *bond,
2528 struct ad_info *ad_info)
2529{
2530 struct aggregator *aggregator = NULL;
2531 struct list_head *iter;
2532 struct slave *slave;
2533 struct port *port;
2534
2535 bond_for_each_slave_rcu(bond, slave, iter) {
2536 port = &(SLAVE_AD_INFO(slave)->port);
2537 if (port->aggregator && port->aggregator->is_active) {
2538 aggregator = port->aggregator;
2539 break;
2540 }
2541 }
2542
2543 if (!aggregator)
2544 return -1;
2545
2546 ad_info->aggregator_id = aggregator->aggregator_identifier;
2547 ad_info->ports = aggregator->num_of_ports;
2548 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2549 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2550 ether_addr_copy(ad_info->partner_system,
2551 aggregator->partner_system.mac_addr_value);
2552 return 0;
2553}
2554
2555int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2556{
2557 int ret;
2558
2559 rcu_read_lock();
2560 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2561 rcu_read_unlock();
2562
2563 return ret;
2564}
2565
2566int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2567 struct slave *slave)
2568{
2569 struct lacpdu *lacpdu, _lacpdu;
2570
2571 if (skb->protocol != PKT_TYPE_LACPDU)
2572 return RX_HANDLER_ANOTHER;
2573
2574 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2575 return RX_HANDLER_ANOTHER;
2576
2577 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2578 if (!lacpdu)
2579 return RX_HANDLER_ANOTHER;
2580
2581 return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2582}
2583
2584/**
2585 * bond_3ad_update_lacp_rate - change the lacp rate
2586 * @bond - bonding struct
2587 *
2588 * When modify lacp_rate parameter via sysfs,
2589 * update actor_oper_port_state of each port.
2590 *
2591 * Hold bond->mode_lock,
2592 * so we can modify port->actor_oper_port_state,
2593 * no matter bond is up or down.
2594 */
2595void bond_3ad_update_lacp_rate(struct bonding *bond)
2596{
2597 struct port *port = NULL;
2598 struct list_head *iter;
2599 struct slave *slave;
2600 int lacp_fast;
2601
2602 lacp_fast = bond->params.lacp_fast;
2603 spin_lock_bh(&bond->mode_lock);
2604 bond_for_each_slave(bond, slave, iter) {
2605 port = &(SLAVE_AD_INFO(slave)->port);
2606 if (lacp_fast)
2607 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2608 else
2609 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2610 }
2611 spin_unlock_bh(&bond->mode_lock);
2612}