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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 Variables definitions used by the State Machines (43.4.7 in the
35 * 802.3ad standard)
36 */
37#define AD_PORT_BEGIN 0x1
38#define AD_PORT_LACP_ENABLED 0x2
39#define AD_PORT_ACTOR_CHURN 0x4
40#define AD_PORT_PARTNER_CHURN 0x8
41#define AD_PORT_READY 0x10
42#define AD_PORT_READY_N 0x20
43#define AD_PORT_MATCHED 0x40
44#define AD_PORT_STANDBY 0x80
45#define AD_PORT_SELECTED 0x100
46#define AD_PORT_MOVED 0x200
47#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
48
49/* Port Key definitions
50 * key is determined according to the link speed, duplex and
51 * user key (which is yet not supported)
52 * --------------------------------------------------------------
53 * Port key | User key (10 bits) | Speed (5 bits) | Duplex|
54 * --------------------------------------------------------------
55 * |15 6|5 1|0
56 */
57#define AD_DUPLEX_KEY_MASKS 0x1
58#define AD_SPEED_KEY_MASKS 0x3E
59#define AD_USER_KEY_MASKS 0xFFC0
60
61enum ad_link_speed_type {
62 AD_LINK_SPEED_1MBPS = 1,
63 AD_LINK_SPEED_10MBPS,
64 AD_LINK_SPEED_100MBPS,
65 AD_LINK_SPEED_1000MBPS,
66 AD_LINK_SPEED_2500MBPS,
67 AD_LINK_SPEED_5000MBPS,
68 AD_LINK_SPEED_10000MBPS,
69 AD_LINK_SPEED_14000MBPS,
70 AD_LINK_SPEED_20000MBPS,
71 AD_LINK_SPEED_25000MBPS,
72 AD_LINK_SPEED_40000MBPS,
73 AD_LINK_SPEED_50000MBPS,
74 AD_LINK_SPEED_56000MBPS,
75 AD_LINK_SPEED_100000MBPS,
76 AD_LINK_SPEED_200000MBPS,
77 AD_LINK_SPEED_400000MBPS,
78 AD_LINK_SPEED_800000MBPS,
79};
80
81/* compare MAC addresses */
82#define MAC_ADDRESS_EQUAL(A, B) \
83 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
84
85static const u16 ad_ticks_per_sec = 1000 / AD_TIMER_INTERVAL;
86static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
87
88const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned = {
89 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02
90};
91
92/* ================= main 802.3ad protocol functions ================== */
93static int ad_lacpdu_send(struct port *port);
94static int ad_marker_send(struct port *port, struct bond_marker *marker);
95static void ad_mux_machine(struct port *port, bool *update_slave_arr);
96static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
97static void ad_tx_machine(struct port *port);
98static void ad_periodic_machine(struct port *port, struct bond_params *bond_params);
99static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
100static void ad_agg_selection_logic(struct aggregator *aggregator,
101 bool *update_slave_arr);
102static void ad_clear_agg(struct aggregator *aggregator);
103static void ad_initialize_agg(struct aggregator *aggregator);
104static void ad_initialize_port(struct port *port, int lacp_fast);
105static void ad_enable_collecting(struct port *port);
106static void ad_disable_distributing(struct port *port,
107 bool *update_slave_arr);
108static void ad_enable_collecting_distributing(struct port *port,
109 bool *update_slave_arr);
110static void ad_disable_collecting_distributing(struct port *port,
111 bool *update_slave_arr);
112static void ad_marker_info_received(struct bond_marker *marker_info,
113 struct port *port);
114static void ad_marker_response_received(struct bond_marker *marker,
115 struct port *port);
116static void ad_update_actor_keys(struct port *port, bool reset);
117
118
119/* ================= api to bonding and kernel code ================== */
120
121/**
122 * __get_bond_by_port - get the port's bonding struct
123 * @port: the port we're looking at
124 *
125 * Return @port's bonding struct, or %NULL if it can't be found.
126 */
127static inline struct bonding *__get_bond_by_port(struct port *port)
128{
129 if (port->slave == NULL)
130 return NULL;
131
132 return bond_get_bond_by_slave(port->slave);
133}
134
135/**
136 * __get_first_agg - get the first aggregator in the bond
137 * @port: the port we're looking at
138 *
139 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
140 * found.
141 * The caller must hold RCU or RTNL lock.
142 */
143static inline struct aggregator *__get_first_agg(struct port *port)
144{
145 struct bonding *bond = __get_bond_by_port(port);
146 struct slave *first_slave;
147 struct aggregator *agg;
148
149 /* If there's no bond for this port, or bond has no slaves */
150 if (bond == NULL)
151 return NULL;
152
153 rcu_read_lock();
154 first_slave = bond_first_slave_rcu(bond);
155 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
156 rcu_read_unlock();
157
158 return agg;
159}
160
161/**
162 * __agg_has_partner - see if we have a partner
163 * @agg: the agregator we're looking at
164 *
165 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
166 * address for the partner). Return 0 if not.
167 */
168static inline int __agg_has_partner(struct aggregator *agg)
169{
170 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
171}
172
173/**
174 * __disable_distributing_port - disable the port's slave for distributing.
175 * Port will still be able to collect.
176 * @port: the port we're looking at
177 *
178 * This will disable only distributing on the port's slave.
179 */
180static void __disable_distributing_port(struct port *port)
181{
182 bond_set_slave_tx_disabled_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
183}
184
185/**
186 * __enable_collecting_port - enable the port's slave for collecting,
187 * if it's up
188 * @port: the port we're looking at
189 *
190 * This will enable only collecting on the port's slave.
191 */
192static void __enable_collecting_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_rx_enabled_flags(slave, BOND_SLAVE_NOTIFY_LATER);
198}
199
200/**
201 * __disable_port - disable the port's slave
202 * @port: the port we're looking at
203 *
204 * This will disable both collecting and distributing on the port's slave.
205 */
206static inline void __disable_port(struct port *port)
207{
208 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
209}
210
211/**
212 * __enable_port - enable the port's slave, if it's up
213 * @port: the port we're looking at
214 *
215 * This will enable both collecting and distributing on the port's slave.
216 */
217static inline void __enable_port(struct port *port)
218{
219 struct slave *slave = port->slave;
220
221 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
222 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
223}
224
225/**
226 * __port_move_to_attached_state - check if port should transition back to attached
227 * state.
228 * @port: the port we're looking at
229 */
230static bool __port_move_to_attached_state(struct port *port)
231{
232 if (!(port->sm_vars & AD_PORT_SELECTED) ||
233 (port->sm_vars & AD_PORT_STANDBY) ||
234 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
235 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION))
236 port->sm_mux_state = AD_MUX_ATTACHED;
237
238 return port->sm_mux_state == AD_MUX_ATTACHED;
239}
240
241/**
242 * __port_is_collecting_distributing - check if the port's slave is in the
243 * combined collecting/distributing state
244 * @port: the port we're looking at
245 */
246static int __port_is_collecting_distributing(struct port *port)
247{
248 return bond_is_active_slave(port->slave);
249}
250
251/**
252 * __get_agg_selection_mode - get the aggregator selection mode
253 * @port: the port we're looking at
254 *
255 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
256 */
257static inline u32 __get_agg_selection_mode(struct port *port)
258{
259 struct bonding *bond = __get_bond_by_port(port);
260
261 if (bond == NULL)
262 return BOND_AD_STABLE;
263
264 return bond->params.ad_select;
265}
266
267/**
268 * __check_agg_selection_timer - check if the selection timer has expired
269 * @port: the port we're looking at
270 */
271static inline int __check_agg_selection_timer(struct port *port)
272{
273 struct bonding *bond = __get_bond_by_port(port);
274
275 if (bond == NULL)
276 return 0;
277
278 return atomic_read(&BOND_AD_INFO(bond).agg_select_timer) ? 1 : 0;
279}
280
281/**
282 * __get_link_speed - get a port's speed
283 * @port: the port we're looking at
284 *
285 * Return @port's speed in 802.3ad enum format. i.e. one of:
286 * 0,
287 * %AD_LINK_SPEED_10MBPS,
288 * %AD_LINK_SPEED_100MBPS,
289 * %AD_LINK_SPEED_1000MBPS,
290 * %AD_LINK_SPEED_2500MBPS,
291 * %AD_LINK_SPEED_5000MBPS,
292 * %AD_LINK_SPEED_10000MBPS
293 * %AD_LINK_SPEED_14000MBPS,
294 * %AD_LINK_SPEED_20000MBPS
295 * %AD_LINK_SPEED_25000MBPS
296 * %AD_LINK_SPEED_40000MBPS
297 * %AD_LINK_SPEED_50000MBPS
298 * %AD_LINK_SPEED_56000MBPS
299 * %AD_LINK_SPEED_100000MBPS
300 * %AD_LINK_SPEED_200000MBPS
301 * %AD_LINK_SPEED_400000MBPS
302 * %AD_LINK_SPEED_800000MBPS
303 */
304static u16 __get_link_speed(struct port *port)
305{
306 struct slave *slave = port->slave;
307 u16 speed;
308
309 /* this if covers only a special case: when the configuration starts
310 * with link down, it sets the speed to 0.
311 * This is done in spite of the fact that the e100 driver reports 0
312 * to be compatible with MVT in the future.
313 */
314 if (slave->link != BOND_LINK_UP)
315 speed = 0;
316 else {
317 switch (slave->speed) {
318 case SPEED_10:
319 speed = AD_LINK_SPEED_10MBPS;
320 break;
321
322 case SPEED_100:
323 speed = AD_LINK_SPEED_100MBPS;
324 break;
325
326 case SPEED_1000:
327 speed = AD_LINK_SPEED_1000MBPS;
328 break;
329
330 case SPEED_2500:
331 speed = AD_LINK_SPEED_2500MBPS;
332 break;
333
334 case SPEED_5000:
335 speed = AD_LINK_SPEED_5000MBPS;
336 break;
337
338 case SPEED_10000:
339 speed = AD_LINK_SPEED_10000MBPS;
340 break;
341
342 case SPEED_14000:
343 speed = AD_LINK_SPEED_14000MBPS;
344 break;
345
346 case SPEED_20000:
347 speed = AD_LINK_SPEED_20000MBPS;
348 break;
349
350 case SPEED_25000:
351 speed = AD_LINK_SPEED_25000MBPS;
352 break;
353
354 case SPEED_40000:
355 speed = AD_LINK_SPEED_40000MBPS;
356 break;
357
358 case SPEED_50000:
359 speed = AD_LINK_SPEED_50000MBPS;
360 break;
361
362 case SPEED_56000:
363 speed = AD_LINK_SPEED_56000MBPS;
364 break;
365
366 case SPEED_100000:
367 speed = AD_LINK_SPEED_100000MBPS;
368 break;
369
370 case SPEED_200000:
371 speed = AD_LINK_SPEED_200000MBPS;
372 break;
373
374 case SPEED_400000:
375 speed = AD_LINK_SPEED_400000MBPS;
376 break;
377
378 case SPEED_800000:
379 speed = AD_LINK_SPEED_800000MBPS;
380 break;
381
382 default:
383 /* unknown speed value from ethtool. shouldn't happen */
384 if (slave->speed != SPEED_UNKNOWN)
385 pr_err_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n",
386 slave->bond->dev->name,
387 slave->dev->name, slave->speed,
388 port->actor_port_number);
389 speed = 0;
390 break;
391 }
392 }
393
394 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n",
395 port->actor_port_number, speed);
396 return speed;
397}
398
399/**
400 * __get_duplex - get a port's duplex
401 * @port: the port we're looking at
402 *
403 * Return @port's duplex in 802.3ad bitmask format. i.e.:
404 * 0x01 if in full duplex
405 * 0x00 otherwise
406 */
407static u8 __get_duplex(struct port *port)
408{
409 struct slave *slave = port->slave;
410 u8 retval = 0x0;
411
412 /* handling a special case: when the configuration starts with
413 * link down, it sets the duplex to 0.
414 */
415 if (slave->link == BOND_LINK_UP) {
416 switch (slave->duplex) {
417 case DUPLEX_FULL:
418 retval = 0x1;
419 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n",
420 port->actor_port_number);
421 break;
422 case DUPLEX_HALF:
423 default:
424 retval = 0x0;
425 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n",
426 port->actor_port_number);
427 break;
428 }
429 }
430 return retval;
431}
432
433static void __ad_actor_update_port(struct port *port)
434{
435 const struct bonding *bond = bond_get_bond_by_slave(port->slave);
436
437 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
438 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
439}
440
441/* Conversions */
442
443/**
444 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
445 * @timer_type: which timer to operate
446 * @par: timer parameter. see below
447 *
448 * If @timer_type is %current_while_timer, @par indicates long/short timer.
449 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
450 * %SLOW_PERIODIC_TIME.
451 */
452static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
453{
454 u16 retval = 0; /* to silence the compiler */
455
456 switch (timer_type) {
457 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
458 if (par)
459 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
460 else
461 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
462 break;
463 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
464 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
465 break;
466 case AD_PERIODIC_TIMER: /* for periodic machine */
467 retval = (par*ad_ticks_per_sec); /* long timeout */
468 break;
469 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
470 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
471 break;
472 case AD_WAIT_WHILE_TIMER: /* for selection machine */
473 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
474 break;
475 }
476
477 return retval;
478}
479
480
481/* ================= ad_rx_machine helper functions ================== */
482
483/**
484 * __choose_matched - update a port's matched variable from a received lacpdu
485 * @lacpdu: the lacpdu we've received
486 * @port: the port we're looking at
487 *
488 * Update the value of the matched variable, using parameter values from a
489 * newly received lacpdu. Parameter values for the partner carried in the
490 * received PDU are compared with the corresponding operational parameter
491 * values for the actor. Matched is set to TRUE if all of these parameters
492 * match and the PDU parameter partner_state.aggregation has the same value as
493 * actor_oper_port_state.aggregation and lacp will actively maintain the link
494 * in the aggregation. Matched is also set to TRUE if the value of
495 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
496 * an individual link and lacp will actively maintain the link. Otherwise,
497 * matched is set to FALSE. LACP is considered to be actively maintaining the
498 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
499 * the actor's actor_oper_port_state.lacp_activity and the PDU's
500 * partner_state.lacp_activity variables are TRUE.
501 *
502 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
503 * used here to implement the language from 802.3ad 43.4.9 that requires
504 * recordPDU to "match" the LACPDU parameters to the stored values.
505 */
506static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
507{
508 /* check if all parameters are alike
509 * or this is individual link(aggregation == FALSE)
510 * then update the state machine Matched variable.
511 */
512 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
513 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
514 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
515 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
516 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
517 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) ||
518 ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0)
519 ) {
520 port->sm_vars |= AD_PORT_MATCHED;
521 } else {
522 port->sm_vars &= ~AD_PORT_MATCHED;
523 }
524}
525
526/**
527 * __record_pdu - record parameters from a received lacpdu
528 * @lacpdu: the lacpdu we've received
529 * @port: the port we're looking at
530 *
531 * Record the parameter values for the Actor carried in a received lacpdu as
532 * the current partner operational parameter values and sets
533 * actor_oper_port_state.defaulted to FALSE.
534 */
535static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
536{
537 if (lacpdu && port) {
538 struct port_params *partner = &port->partner_oper;
539
540 __choose_matched(lacpdu, port);
541 /* record the new parameter values for the partner
542 * operational
543 */
544 partner->port_number = ntohs(lacpdu->actor_port);
545 partner->port_priority = ntohs(lacpdu->actor_port_priority);
546 partner->system = lacpdu->actor_system;
547 partner->system_priority = ntohs(lacpdu->actor_system_priority);
548 partner->key = ntohs(lacpdu->actor_key);
549 partner->port_state = lacpdu->actor_state;
550
551 /* set actor_oper_port_state.defaulted to FALSE */
552 port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED;
553
554 /* set the partner sync. to on if the partner is sync,
555 * and the port is matched
556 */
557 if ((port->sm_vars & AD_PORT_MATCHED) &&
558 (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) {
559 partner->port_state |= LACP_STATE_SYNCHRONIZATION;
560 slave_dbg(port->slave->bond->dev, port->slave->dev,
561 "partner sync=1\n");
562 } else {
563 partner->port_state &= ~LACP_STATE_SYNCHRONIZATION;
564 slave_dbg(port->slave->bond->dev, port->slave->dev,
565 "partner sync=0\n");
566 }
567 }
568}
569
570/**
571 * __record_default - record default parameters
572 * @port: the port we're looking at
573 *
574 * This function records the default parameter values for the partner carried
575 * in the Partner Admin parameters as the current partner operational parameter
576 * values and sets actor_oper_port_state.defaulted to TRUE.
577 */
578static void __record_default(struct port *port)
579{
580 if (port) {
581 /* record the partner admin parameters */
582 memcpy(&port->partner_oper, &port->partner_admin,
583 sizeof(struct port_params));
584
585 /* set actor_oper_port_state.defaulted to true */
586 port->actor_oper_port_state |= LACP_STATE_DEFAULTED;
587 }
588}
589
590/**
591 * __update_selected - update a port's Selected variable from a received lacpdu
592 * @lacpdu: the lacpdu we've received
593 * @port: the port we're looking at
594 *
595 * Update the value of the selected variable, using parameter values from a
596 * newly received lacpdu. The parameter values for the Actor carried in the
597 * received PDU are compared with the corresponding operational parameter
598 * values for the ports partner. If one or more of the comparisons shows that
599 * the value(s) received in the PDU differ from the current operational values,
600 * then selected is set to FALSE and actor_oper_port_state.synchronization is
601 * set to out_of_sync. Otherwise, selected remains unchanged.
602 */
603static void __update_selected(struct lacpdu *lacpdu, struct port *port)
604{
605 if (lacpdu && port) {
606 const struct port_params *partner = &port->partner_oper;
607
608 /* check if any parameter is different then
609 * update the state machine selected variable.
610 */
611 if (ntohs(lacpdu->actor_port) != partner->port_number ||
612 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
613 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
614 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
615 ntohs(lacpdu->actor_key) != partner->key ||
616 (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) {
617 port->sm_vars &= ~AD_PORT_SELECTED;
618 }
619 }
620}
621
622/**
623 * __update_default_selected - update a port's Selected variable from Partner
624 * @port: the port we're looking at
625 *
626 * This function updates the value of the selected variable, using the partner
627 * administrative parameter values. The administrative values are compared with
628 * the corresponding operational parameter values for the partner. If one or
629 * more of the comparisons shows that the administrative value(s) differ from
630 * the current operational values, then Selected is set to FALSE and
631 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
632 * Selected remains unchanged.
633 */
634static void __update_default_selected(struct port *port)
635{
636 if (port) {
637 const struct port_params *admin = &port->partner_admin;
638 const struct port_params *oper = &port->partner_oper;
639
640 /* check if any parameter is different then
641 * update the state machine selected variable.
642 */
643 if (admin->port_number != oper->port_number ||
644 admin->port_priority != oper->port_priority ||
645 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
646 admin->system_priority != oper->system_priority ||
647 admin->key != oper->key ||
648 (admin->port_state & LACP_STATE_AGGREGATION)
649 != (oper->port_state & LACP_STATE_AGGREGATION)) {
650 port->sm_vars &= ~AD_PORT_SELECTED;
651 }
652 }
653}
654
655/**
656 * __update_ntt - update a port's ntt variable from a received lacpdu
657 * @lacpdu: the lacpdu we've received
658 * @port: the port we're looking at
659 *
660 * Updates the value of the ntt variable, using parameter values from a newly
661 * received lacpdu. The parameter values for the partner carried in the
662 * received PDU are compared with the corresponding operational parameter
663 * values for the Actor. If one or more of the comparisons shows that the
664 * value(s) received in the PDU differ from the current operational values,
665 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
666 */
667static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
668{
669 /* validate lacpdu and port */
670 if (lacpdu && port) {
671 /* check if any parameter is different then
672 * update the port->ntt.
673 */
674 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
675 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
676 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
677 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
678 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
679 ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) ||
680 ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) ||
681 ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) ||
682 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION))
683 ) {
684 port->ntt = true;
685 }
686 }
687}
688
689/**
690 * __agg_ports_are_ready - check if all ports in an aggregator are ready
691 * @aggregator: the aggregator we're looking at
692 *
693 */
694static int __agg_ports_are_ready(struct aggregator *aggregator)
695{
696 struct port *port;
697 int retval = 1;
698
699 if (aggregator) {
700 /* scan all ports in this aggregator to verfy if they are
701 * all ready.
702 */
703 for (port = aggregator->lag_ports;
704 port;
705 port = port->next_port_in_aggregator) {
706 if (!(port->sm_vars & AD_PORT_READY_N)) {
707 retval = 0;
708 break;
709 }
710 }
711 }
712
713 return retval;
714}
715
716/**
717 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
718 * @aggregator: the aggregator we're looking at
719 * @val: Should the ports' ready bit be set on or off
720 *
721 */
722static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
723{
724 struct port *port;
725
726 for (port = aggregator->lag_ports; port;
727 port = port->next_port_in_aggregator) {
728 if (val)
729 port->sm_vars |= AD_PORT_READY;
730 else
731 port->sm_vars &= ~AD_PORT_READY;
732 }
733}
734
735static int __agg_active_ports(struct aggregator *agg)
736{
737 struct port *port;
738 int active = 0;
739
740 for (port = agg->lag_ports; port;
741 port = port->next_port_in_aggregator) {
742 if (port->is_enabled)
743 active++;
744 }
745
746 return active;
747}
748
749/**
750 * __get_agg_bandwidth - get the total bandwidth of an aggregator
751 * @aggregator: the aggregator we're looking at
752 *
753 */
754static u32 __get_agg_bandwidth(struct aggregator *aggregator)
755{
756 int nports = __agg_active_ports(aggregator);
757 u32 bandwidth = 0;
758
759 if (nports) {
760 switch (__get_link_speed(aggregator->lag_ports)) {
761 case AD_LINK_SPEED_1MBPS:
762 bandwidth = nports;
763 break;
764 case AD_LINK_SPEED_10MBPS:
765 bandwidth = nports * 10;
766 break;
767 case AD_LINK_SPEED_100MBPS:
768 bandwidth = nports * 100;
769 break;
770 case AD_LINK_SPEED_1000MBPS:
771 bandwidth = nports * 1000;
772 break;
773 case AD_LINK_SPEED_2500MBPS:
774 bandwidth = nports * 2500;
775 break;
776 case AD_LINK_SPEED_5000MBPS:
777 bandwidth = nports * 5000;
778 break;
779 case AD_LINK_SPEED_10000MBPS:
780 bandwidth = nports * 10000;
781 break;
782 case AD_LINK_SPEED_14000MBPS:
783 bandwidth = nports * 14000;
784 break;
785 case AD_LINK_SPEED_20000MBPS:
786 bandwidth = nports * 20000;
787 break;
788 case AD_LINK_SPEED_25000MBPS:
789 bandwidth = nports * 25000;
790 break;
791 case AD_LINK_SPEED_40000MBPS:
792 bandwidth = nports * 40000;
793 break;
794 case AD_LINK_SPEED_50000MBPS:
795 bandwidth = nports * 50000;
796 break;
797 case AD_LINK_SPEED_56000MBPS:
798 bandwidth = nports * 56000;
799 break;
800 case AD_LINK_SPEED_100000MBPS:
801 bandwidth = nports * 100000;
802 break;
803 case AD_LINK_SPEED_200000MBPS:
804 bandwidth = nports * 200000;
805 break;
806 case AD_LINK_SPEED_400000MBPS:
807 bandwidth = nports * 400000;
808 break;
809 case AD_LINK_SPEED_800000MBPS:
810 bandwidth = nports * 800000;
811 break;
812 default:
813 bandwidth = 0; /* to silence the compiler */
814 }
815 }
816 return bandwidth;
817}
818
819/**
820 * __get_active_agg - get the current active aggregator
821 * @aggregator: the aggregator we're looking at
822 *
823 * Caller must hold RCU lock.
824 */
825static struct aggregator *__get_active_agg(struct aggregator *aggregator)
826{
827 struct bonding *bond = aggregator->slave->bond;
828 struct list_head *iter;
829 struct slave *slave;
830
831 bond_for_each_slave_rcu(bond, slave, iter)
832 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
833 return &(SLAVE_AD_INFO(slave)->aggregator);
834
835 return NULL;
836}
837
838/**
839 * __update_lacpdu_from_port - update a port's lacpdu fields
840 * @port: the port we're looking at
841 */
842static inline void __update_lacpdu_from_port(struct port *port)
843{
844 struct lacpdu *lacpdu = &port->lacpdu;
845 const struct port_params *partner = &port->partner_oper;
846
847 /* update current actual Actor parameters
848 * lacpdu->subtype initialized
849 * lacpdu->version_number initialized
850 * lacpdu->tlv_type_actor_info initialized
851 * lacpdu->actor_information_length initialized
852 */
853
854 lacpdu->actor_system_priority = htons(port->actor_system_priority);
855 lacpdu->actor_system = port->actor_system;
856 lacpdu->actor_key = htons(port->actor_oper_port_key);
857 lacpdu->actor_port_priority = htons(port->actor_port_priority);
858 lacpdu->actor_port = htons(port->actor_port_number);
859 lacpdu->actor_state = port->actor_oper_port_state;
860 slave_dbg(port->slave->bond->dev, port->slave->dev,
861 "update lacpdu: actor port state %x\n",
862 port->actor_oper_port_state);
863
864 /* lacpdu->reserved_3_1 initialized
865 * lacpdu->tlv_type_partner_info initialized
866 * lacpdu->partner_information_length initialized
867 */
868
869 lacpdu->partner_system_priority = htons(partner->system_priority);
870 lacpdu->partner_system = partner->system;
871 lacpdu->partner_key = htons(partner->key);
872 lacpdu->partner_port_priority = htons(partner->port_priority);
873 lacpdu->partner_port = htons(partner->port_number);
874 lacpdu->partner_state = partner->port_state;
875
876 /* lacpdu->reserved_3_2 initialized
877 * lacpdu->tlv_type_collector_info initialized
878 * lacpdu->collector_information_length initialized
879 * collector_max_delay initialized
880 * reserved_12[12] initialized
881 * tlv_type_terminator initialized
882 * terminator_length initialized
883 * reserved_50[50] initialized
884 */
885}
886
887/* ================= main 802.3ad protocol code ========================= */
888
889/**
890 * ad_lacpdu_send - send out a lacpdu packet on a given port
891 * @port: the port we're looking at
892 *
893 * Returns: 0 on success
894 * < 0 on error
895 */
896static int ad_lacpdu_send(struct port *port)
897{
898 struct slave *slave = port->slave;
899 struct sk_buff *skb;
900 struct lacpdu_header *lacpdu_header;
901 int length = sizeof(struct lacpdu_header);
902
903 skb = dev_alloc_skb(length);
904 if (!skb)
905 return -ENOMEM;
906
907 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx);
908 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx);
909
910 skb->dev = slave->dev;
911 skb_reset_mac_header(skb);
912 skb->network_header = skb->mac_header + ETH_HLEN;
913 skb->protocol = PKT_TYPE_LACPDU;
914 skb->priority = TC_PRIO_CONTROL;
915
916 lacpdu_header = skb_put(skb, length);
917
918 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
919 /* Note: source address is set to be the member's PERMANENT address,
920 * because we use it to identify loopback lacpdus in receive.
921 */
922 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
923 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
924
925 lacpdu_header->lacpdu = port->lacpdu;
926
927 dev_queue_xmit(skb);
928
929 return 0;
930}
931
932/**
933 * ad_marker_send - send marker information/response on a given port
934 * @port: the port we're looking at
935 * @marker: marker data to send
936 *
937 * Returns: 0 on success
938 * < 0 on error
939 */
940static int ad_marker_send(struct port *port, struct bond_marker *marker)
941{
942 struct slave *slave = port->slave;
943 struct sk_buff *skb;
944 struct bond_marker_header *marker_header;
945 int length = sizeof(struct bond_marker_header);
946
947 skb = dev_alloc_skb(length + 16);
948 if (!skb)
949 return -ENOMEM;
950
951 switch (marker->tlv_type) {
952 case AD_MARKER_INFORMATION_SUBTYPE:
953 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx);
954 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx);
955 break;
956 case AD_MARKER_RESPONSE_SUBTYPE:
957 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx);
958 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx);
959 break;
960 }
961
962 skb_reserve(skb, 16);
963
964 skb->dev = slave->dev;
965 skb_reset_mac_header(skb);
966 skb->network_header = skb->mac_header + ETH_HLEN;
967 skb->protocol = PKT_TYPE_LACPDU;
968
969 marker_header = skb_put(skb, length);
970
971 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
972 /* Note: source address is set to be the member's PERMANENT address,
973 * because we use it to identify loopback MARKERs in receive.
974 */
975 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
976 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
977
978 marker_header->marker = *marker;
979
980 dev_queue_xmit(skb);
981
982 return 0;
983}
984
985/**
986 * ad_mux_machine - handle a port's mux state machine
987 * @port: the port we're looking at
988 * @update_slave_arr: Does slave array need update?
989 */
990static void ad_mux_machine(struct port *port, bool *update_slave_arr)
991{
992 struct bonding *bond = __get_bond_by_port(port);
993 mux_states_t last_state;
994
995 /* keep current State Machine state to compare later if it was
996 * changed
997 */
998 last_state = port->sm_mux_state;
999
1000 if (port->sm_vars & AD_PORT_BEGIN) {
1001 port->sm_mux_state = AD_MUX_DETACHED;
1002 } else {
1003 switch (port->sm_mux_state) {
1004 case AD_MUX_DETACHED:
1005 if ((port->sm_vars & AD_PORT_SELECTED)
1006 || (port->sm_vars & AD_PORT_STANDBY))
1007 /* if SELECTED or STANDBY */
1008 port->sm_mux_state = AD_MUX_WAITING;
1009 break;
1010 case AD_MUX_WAITING:
1011 /* if SELECTED == FALSE return to DETACH state */
1012 if (!(port->sm_vars & AD_PORT_SELECTED)) {
1013 port->sm_vars &= ~AD_PORT_READY_N;
1014 /* in order to withhold the Selection Logic to
1015 * check all ports READY_N value every callback
1016 * cycle to update ready variable, we check
1017 * READY_N and update READY here
1018 */
1019 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1020 port->sm_mux_state = AD_MUX_DETACHED;
1021 break;
1022 }
1023
1024 /* check if the wait_while_timer expired */
1025 if (port->sm_mux_timer_counter
1026 && !(--port->sm_mux_timer_counter))
1027 port->sm_vars |= AD_PORT_READY_N;
1028
1029 /* in order to withhold the selection logic to check
1030 * all ports READY_N value every callback cycle to
1031 * update ready variable, we check READY_N and update
1032 * READY here
1033 */
1034 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1035
1036 /* if the wait_while_timer expired, and the port is
1037 * in READY state, move to ATTACHED state
1038 */
1039 if ((port->sm_vars & AD_PORT_READY)
1040 && !port->sm_mux_timer_counter)
1041 port->sm_mux_state = AD_MUX_ATTACHED;
1042 break;
1043 case AD_MUX_ATTACHED:
1044 /* check also if agg_select_timer expired (so the
1045 * edable port will take place only after this timer)
1046 */
1047 if ((port->sm_vars & AD_PORT_SELECTED) &&
1048 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
1049 !__check_agg_selection_timer(port)) {
1050 if (port->aggregator->is_active) {
1051 int state = AD_MUX_COLLECTING_DISTRIBUTING;
1052
1053 if (!bond->params.coupled_control)
1054 state = AD_MUX_COLLECTING;
1055 port->sm_mux_state = state;
1056 }
1057 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
1058 (port->sm_vars & AD_PORT_STANDBY)) {
1059 /* if UNSELECTED or STANDBY */
1060 port->sm_vars &= ~AD_PORT_READY_N;
1061 /* in order to withhold the selection logic to
1062 * check all ports READY_N value every callback
1063 * cycle to update ready variable, we check
1064 * READY_N and update READY here
1065 */
1066 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1067 port->sm_mux_state = AD_MUX_DETACHED;
1068 } else if (port->aggregator->is_active) {
1069 port->actor_oper_port_state |=
1070 LACP_STATE_SYNCHRONIZATION;
1071 }
1072 break;
1073 case AD_MUX_COLLECTING_DISTRIBUTING:
1074 if (!__port_move_to_attached_state(port)) {
1075 /* if port state hasn't changed make
1076 * sure that a collecting distributing
1077 * port in an active aggregator is enabled
1078 */
1079 if (port->aggregator->is_active &&
1080 !__port_is_collecting_distributing(port)) {
1081 __enable_port(port);
1082 *update_slave_arr = true;
1083 }
1084 }
1085 break;
1086 case AD_MUX_COLLECTING:
1087 if (!__port_move_to_attached_state(port)) {
1088 if ((port->sm_vars & AD_PORT_SELECTED) &&
1089 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
1090 (port->partner_oper.port_state & LACP_STATE_COLLECTING)) {
1091 port->sm_mux_state = AD_MUX_DISTRIBUTING;
1092 } else {
1093 /* If port state hasn't changed, make sure that a collecting
1094 * port is enabled for an active aggregator.
1095 */
1096 struct slave *slave = port->slave;
1097
1098 if (port->aggregator->is_active &&
1099 bond_is_slave_rx_disabled(slave)) {
1100 ad_enable_collecting(port);
1101 *update_slave_arr = true;
1102 }
1103 }
1104 }
1105 break;
1106 case AD_MUX_DISTRIBUTING:
1107 if (!(port->sm_vars & AD_PORT_SELECTED) ||
1108 (port->sm_vars & AD_PORT_STANDBY) ||
1109 !(port->partner_oper.port_state & LACP_STATE_COLLECTING) ||
1110 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
1111 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) {
1112 port->sm_mux_state = AD_MUX_COLLECTING;
1113 } else {
1114 /* if port state hasn't changed make
1115 * sure that a collecting distributing
1116 * port in an active aggregator is enabled
1117 */
1118 if (port->aggregator &&
1119 port->aggregator->is_active &&
1120 !__port_is_collecting_distributing(port)) {
1121 __enable_port(port);
1122 *update_slave_arr = true;
1123 }
1124 }
1125 break;
1126 default:
1127 break;
1128 }
1129 }
1130
1131 /* check if the state machine was changed */
1132 if (port->sm_mux_state != last_state) {
1133 slave_dbg(port->slave->bond->dev, port->slave->dev,
1134 "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
1135 port->actor_port_number,
1136 last_state,
1137 port->sm_mux_state);
1138 switch (port->sm_mux_state) {
1139 case AD_MUX_DETACHED:
1140 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1141 ad_disable_collecting_distributing(port,
1142 update_slave_arr);
1143 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1144 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1145 port->ntt = true;
1146 break;
1147 case AD_MUX_WAITING:
1148 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1149 break;
1150 case AD_MUX_ATTACHED:
1151 if (port->aggregator->is_active)
1152 port->actor_oper_port_state |=
1153 LACP_STATE_SYNCHRONIZATION;
1154 else
1155 port->actor_oper_port_state &=
1156 ~LACP_STATE_SYNCHRONIZATION;
1157 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1158 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1159 ad_disable_collecting_distributing(port,
1160 update_slave_arr);
1161 port->ntt = true;
1162 break;
1163 case AD_MUX_COLLECTING_DISTRIBUTING:
1164 port->actor_oper_port_state |= LACP_STATE_COLLECTING;
1165 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
1166 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1167 ad_enable_collecting_distributing(port,
1168 update_slave_arr);
1169 port->ntt = true;
1170 break;
1171 case AD_MUX_COLLECTING:
1172 port->actor_oper_port_state |= LACP_STATE_COLLECTING;
1173 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1174 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1175 ad_enable_collecting(port);
1176 ad_disable_distributing(port, update_slave_arr);
1177 port->ntt = true;
1178 break;
1179 case AD_MUX_DISTRIBUTING:
1180 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
1181 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1182 ad_enable_collecting_distributing(port,
1183 update_slave_arr);
1184 break;
1185 default:
1186 break;
1187 }
1188 }
1189}
1190
1191/**
1192 * ad_rx_machine - handle a port's rx State Machine
1193 * @lacpdu: the lacpdu we've received
1194 * @port: the port we're looking at
1195 *
1196 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1197 * CURRENT. If timer expired set the state machine in the proper state.
1198 * In other cases, this function checks if we need to switch to other state.
1199 */
1200static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1201{
1202 rx_states_t last_state;
1203
1204 /* keep current State Machine state to compare later if it was
1205 * changed
1206 */
1207 last_state = port->sm_rx_state;
1208
1209 if (lacpdu) {
1210 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx);
1211 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx);
1212 }
1213 /* check if state machine should change state */
1214
1215 /* first, check if port was reinitialized */
1216 if (port->sm_vars & AD_PORT_BEGIN) {
1217 port->sm_rx_state = AD_RX_INITIALIZE;
1218 port->sm_vars |= AD_PORT_CHURNED;
1219 /* check if port is not enabled */
1220 } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1221 port->sm_rx_state = AD_RX_PORT_DISABLED;
1222 /* check if new lacpdu arrived */
1223 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1224 (port->sm_rx_state == AD_RX_DEFAULTED) ||
1225 (port->sm_rx_state == AD_RX_CURRENT))) {
1226 if (port->sm_rx_state != AD_RX_CURRENT)
1227 port->sm_vars |= AD_PORT_CHURNED;
1228 port->sm_rx_timer_counter = 0;
1229 port->sm_rx_state = AD_RX_CURRENT;
1230 } else {
1231 /* if timer is on, and if it is expired */
1232 if (port->sm_rx_timer_counter &&
1233 !(--port->sm_rx_timer_counter)) {
1234 switch (port->sm_rx_state) {
1235 case AD_RX_EXPIRED:
1236 port->sm_rx_state = AD_RX_DEFAULTED;
1237 break;
1238 case AD_RX_CURRENT:
1239 port->sm_rx_state = AD_RX_EXPIRED;
1240 break;
1241 default:
1242 break;
1243 }
1244 } else {
1245 /* if no lacpdu arrived and no timer is on */
1246 switch (port->sm_rx_state) {
1247 case AD_RX_PORT_DISABLED:
1248 if (port->is_enabled &&
1249 (port->sm_vars & AD_PORT_LACP_ENABLED))
1250 port->sm_rx_state = AD_RX_EXPIRED;
1251 else if (port->is_enabled
1252 && ((port->sm_vars
1253 & AD_PORT_LACP_ENABLED) == 0))
1254 port->sm_rx_state = AD_RX_LACP_DISABLED;
1255 break;
1256 default:
1257 break;
1258
1259 }
1260 }
1261 }
1262
1263 /* check if the State machine was changed or new lacpdu arrived */
1264 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1265 slave_dbg(port->slave->bond->dev, port->slave->dev,
1266 "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1267 port->actor_port_number,
1268 last_state,
1269 port->sm_rx_state);
1270 switch (port->sm_rx_state) {
1271 case AD_RX_INITIALIZE:
1272 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1273 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1274 else
1275 port->sm_vars |= AD_PORT_LACP_ENABLED;
1276 port->sm_vars &= ~AD_PORT_SELECTED;
1277 __record_default(port);
1278 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1279 port->sm_rx_state = AD_RX_PORT_DISABLED;
1280
1281 fallthrough;
1282 case AD_RX_PORT_DISABLED:
1283 port->sm_vars &= ~AD_PORT_MATCHED;
1284 break;
1285 case AD_RX_LACP_DISABLED:
1286 port->sm_vars &= ~AD_PORT_SELECTED;
1287 __record_default(port);
1288 port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION;
1289 port->sm_vars |= AD_PORT_MATCHED;
1290 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1291 break;
1292 case AD_RX_EXPIRED:
1293 /* Reset of the Synchronization flag (Standard 43.4.12)
1294 * This reset cause to disable this port in the
1295 * COLLECTING_DISTRIBUTING state of the mux machine in
1296 * case of EXPIRED even if LINK_DOWN didn't arrive for
1297 * the port.
1298 */
1299 port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION;
1300 port->sm_vars &= ~AD_PORT_MATCHED;
1301 port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT;
1302 port->partner_oper.port_state |= LACP_STATE_LACP_ACTIVITY;
1303 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1304 port->actor_oper_port_state |= LACP_STATE_EXPIRED;
1305 port->sm_vars |= AD_PORT_CHURNED;
1306 break;
1307 case AD_RX_DEFAULTED:
1308 __update_default_selected(port);
1309 __record_default(port);
1310 port->sm_vars |= AD_PORT_MATCHED;
1311 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1312 break;
1313 case AD_RX_CURRENT:
1314 /* detect loopback situation */
1315 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1316 &(port->actor_system))) {
1317 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n"
1318 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n");
1319 return;
1320 }
1321 __update_selected(lacpdu, port);
1322 __update_ntt(lacpdu, port);
1323 __record_pdu(lacpdu, port);
1324 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT));
1325 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1326 break;
1327 default:
1328 break;
1329 }
1330 }
1331}
1332
1333/**
1334 * ad_churn_machine - handle port churn's state machine
1335 * @port: the port we're looking at
1336 *
1337 */
1338static void ad_churn_machine(struct port *port)
1339{
1340 if (port->sm_vars & AD_PORT_CHURNED) {
1341 port->sm_vars &= ~AD_PORT_CHURNED;
1342 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1343 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1344 port->sm_churn_actor_timer_counter =
1345 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1346 port->sm_churn_partner_timer_counter =
1347 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1348 return;
1349 }
1350 if (port->sm_churn_actor_timer_counter &&
1351 !(--port->sm_churn_actor_timer_counter) &&
1352 port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1353 if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) {
1354 port->sm_churn_actor_state = AD_NO_CHURN;
1355 } else {
1356 port->churn_actor_count++;
1357 port->sm_churn_actor_state = AD_CHURN;
1358 }
1359 }
1360 if (port->sm_churn_partner_timer_counter &&
1361 !(--port->sm_churn_partner_timer_counter) &&
1362 port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1363 if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) {
1364 port->sm_churn_partner_state = AD_NO_CHURN;
1365 } else {
1366 port->churn_partner_count++;
1367 port->sm_churn_partner_state = AD_CHURN;
1368 }
1369 }
1370}
1371
1372/**
1373 * ad_tx_machine - handle a port's tx state machine
1374 * @port: the port we're looking at
1375 */
1376static void ad_tx_machine(struct port *port)
1377{
1378 /* check if tx timer expired, to verify that we do not send more than
1379 * 3 packets per second
1380 */
1381 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1382 /* check if there is something to send */
1383 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1384 __update_lacpdu_from_port(port);
1385
1386 if (ad_lacpdu_send(port) >= 0) {
1387 slave_dbg(port->slave->bond->dev,
1388 port->slave->dev,
1389 "Sent LACPDU on port %d\n",
1390 port->actor_port_number);
1391
1392 /* mark ntt as false, so it will not be sent
1393 * again until demanded
1394 */
1395 port->ntt = false;
1396 }
1397 }
1398 /* restart tx timer(to verify that we will not exceed
1399 * AD_MAX_TX_IN_SECOND
1400 */
1401 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1402 }
1403}
1404
1405/**
1406 * ad_periodic_machine - handle a port's periodic state machine
1407 * @port: the port we're looking at
1408 * @bond_params: bond parameters we will use
1409 *
1410 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1411 */
1412static void ad_periodic_machine(struct port *port, struct bond_params *bond_params)
1413{
1414 periodic_states_t last_state;
1415
1416 /* keep current state machine state to compare later if it was changed */
1417 last_state = port->sm_periodic_state;
1418
1419 /* check if port was reinitialized */
1420 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1421 (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY)) ||
1422 !bond_params->lacp_active) {
1423 port->sm_periodic_state = AD_NO_PERIODIC;
1424 }
1425 /* check if state machine should change state */
1426 else if (port->sm_periodic_timer_counter) {
1427 /* check if periodic state machine expired */
1428 if (!(--port->sm_periodic_timer_counter)) {
1429 /* if expired then do tx */
1430 port->sm_periodic_state = AD_PERIODIC_TX;
1431 } else {
1432 /* If not expired, check if there is some new timeout
1433 * parameter from the partner state
1434 */
1435 switch (port->sm_periodic_state) {
1436 case AD_FAST_PERIODIC:
1437 if (!(port->partner_oper.port_state
1438 & LACP_STATE_LACP_TIMEOUT))
1439 port->sm_periodic_state = AD_SLOW_PERIODIC;
1440 break;
1441 case AD_SLOW_PERIODIC:
1442 if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) {
1443 port->sm_periodic_timer_counter = 0;
1444 port->sm_periodic_state = AD_PERIODIC_TX;
1445 }
1446 break;
1447 default:
1448 break;
1449 }
1450 }
1451 } else {
1452 switch (port->sm_periodic_state) {
1453 case AD_NO_PERIODIC:
1454 port->sm_periodic_state = AD_FAST_PERIODIC;
1455 break;
1456 case AD_PERIODIC_TX:
1457 if (!(port->partner_oper.port_state &
1458 LACP_STATE_LACP_TIMEOUT))
1459 port->sm_periodic_state = AD_SLOW_PERIODIC;
1460 else
1461 port->sm_periodic_state = AD_FAST_PERIODIC;
1462 break;
1463 default:
1464 break;
1465 }
1466 }
1467
1468 /* check if the state machine was changed */
1469 if (port->sm_periodic_state != last_state) {
1470 slave_dbg(port->slave->bond->dev, port->slave->dev,
1471 "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1472 port->actor_port_number, last_state,
1473 port->sm_periodic_state);
1474 switch (port->sm_periodic_state) {
1475 case AD_NO_PERIODIC:
1476 port->sm_periodic_timer_counter = 0;
1477 break;
1478 case AD_FAST_PERIODIC:
1479 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1480 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1481 break;
1482 case AD_SLOW_PERIODIC:
1483 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1484 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1485 break;
1486 case AD_PERIODIC_TX:
1487 port->ntt = true;
1488 break;
1489 default:
1490 break;
1491 }
1492 }
1493}
1494
1495/**
1496 * ad_port_selection_logic - select aggregation groups
1497 * @port: the port we're looking at
1498 * @update_slave_arr: Does slave array need update?
1499 *
1500 * Select aggregation groups, and assign each port for it's aggregetor. The
1501 * selection logic is called in the inititalization (after all the handshkes),
1502 * and after every lacpdu receive (if selected is off).
1503 */
1504static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1505{
1506 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1507 struct port *last_port = NULL, *curr_port;
1508 struct list_head *iter;
1509 struct bonding *bond;
1510 struct slave *slave;
1511 int found = 0;
1512
1513 /* if the port is already Selected, do nothing */
1514 if (port->sm_vars & AD_PORT_SELECTED)
1515 return;
1516
1517 bond = __get_bond_by_port(port);
1518
1519 /* if the port is connected to other aggregator, detach it */
1520 if (port->aggregator) {
1521 /* detach the port from its former aggregator */
1522 temp_aggregator = port->aggregator;
1523 for (curr_port = temp_aggregator->lag_ports; curr_port;
1524 last_port = curr_port,
1525 curr_port = curr_port->next_port_in_aggregator) {
1526 if (curr_port == port) {
1527 temp_aggregator->num_of_ports--;
1528 /* if it is the first port attached to the
1529 * aggregator
1530 */
1531 if (!last_port) {
1532 temp_aggregator->lag_ports =
1533 port->next_port_in_aggregator;
1534 } else {
1535 /* not the first port attached to the
1536 * aggregator
1537 */
1538 last_port->next_port_in_aggregator =
1539 port->next_port_in_aggregator;
1540 }
1541
1542 /* clear the port's relations to this
1543 * aggregator
1544 */
1545 port->aggregator = NULL;
1546 port->next_port_in_aggregator = NULL;
1547 port->actor_port_aggregator_identifier = 0;
1548
1549 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n",
1550 port->actor_port_number,
1551 temp_aggregator->aggregator_identifier);
1552 /* if the aggregator is empty, clear its
1553 * parameters, and set it ready to be attached
1554 */
1555 if (!temp_aggregator->lag_ports)
1556 ad_clear_agg(temp_aggregator);
1557 break;
1558 }
1559 }
1560 if (!curr_port) {
1561 /* meaning: the port was related to an aggregator
1562 * but was not on the aggregator port list
1563 */
1564 net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n",
1565 port->slave->bond->dev->name,
1566 port->slave->dev->name,
1567 port->actor_port_number,
1568 port->aggregator->aggregator_identifier);
1569 }
1570 }
1571 /* search on all aggregators for a suitable aggregator for this port */
1572 bond_for_each_slave(bond, slave, iter) {
1573 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1574
1575 /* keep a free aggregator for later use(if needed) */
1576 if (!aggregator->lag_ports) {
1577 if (!free_aggregator)
1578 free_aggregator = aggregator;
1579 continue;
1580 }
1581 /* check if current aggregator suits us */
1582 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1583 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1584 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1585 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1586 ) &&
1587 ((__agg_has_partner(aggregator) && /* partner answers */
1588 !aggregator->is_individual) /* but is not individual OR */
1589 )
1590 ) {
1591 /* attach to the founded aggregator */
1592 port->aggregator = aggregator;
1593 port->actor_port_aggregator_identifier =
1594 port->aggregator->aggregator_identifier;
1595 port->next_port_in_aggregator = aggregator->lag_ports;
1596 port->aggregator->num_of_ports++;
1597 aggregator->lag_ports = port;
1598 slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n",
1599 port->actor_port_number,
1600 port->aggregator->aggregator_identifier);
1601
1602 /* mark this port as selected */
1603 port->sm_vars |= AD_PORT_SELECTED;
1604 found = 1;
1605 break;
1606 }
1607 }
1608
1609 /* the port couldn't find an aggregator - attach it to a new
1610 * aggregator
1611 */
1612 if (!found) {
1613 if (free_aggregator) {
1614 /* assign port a new aggregator */
1615 port->aggregator = free_aggregator;
1616 port->actor_port_aggregator_identifier =
1617 port->aggregator->aggregator_identifier;
1618
1619 /* update the new aggregator's parameters
1620 * if port was responsed from the end-user
1621 */
1622 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1623 /* if port is full duplex */
1624 port->aggregator->is_individual = false;
1625 else
1626 port->aggregator->is_individual = true;
1627
1628 port->aggregator->actor_admin_aggregator_key =
1629 port->actor_admin_port_key;
1630 port->aggregator->actor_oper_aggregator_key =
1631 port->actor_oper_port_key;
1632 port->aggregator->partner_system =
1633 port->partner_oper.system;
1634 port->aggregator->partner_system_priority =
1635 port->partner_oper.system_priority;
1636 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1637 port->aggregator->receive_state = 1;
1638 port->aggregator->transmit_state = 1;
1639 port->aggregator->lag_ports = port;
1640 port->aggregator->num_of_ports++;
1641
1642 /* mark this port as selected */
1643 port->sm_vars |= AD_PORT_SELECTED;
1644
1645 slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n",
1646 port->actor_port_number,
1647 port->aggregator->aggregator_identifier);
1648 } else {
1649 slave_err(bond->dev, port->slave->dev,
1650 "Port %d did not find a suitable aggregator\n",
1651 port->actor_port_number);
1652 return;
1653 }
1654 }
1655 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1656 * in all aggregator's ports, else set ready=FALSE in all
1657 * aggregator's ports
1658 */
1659 __set_agg_ports_ready(port->aggregator,
1660 __agg_ports_are_ready(port->aggregator));
1661
1662 aggregator = __get_first_agg(port);
1663 ad_agg_selection_logic(aggregator, update_slave_arr);
1664
1665 if (!port->aggregator->is_active)
1666 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1667}
1668
1669/* Decide if "agg" is a better choice for the new active aggregator that
1670 * the current best, according to the ad_select policy.
1671 */
1672static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1673 struct aggregator *curr)
1674{
1675 /* 0. If no best, select current.
1676 *
1677 * 1. If the current agg is not individual, and the best is
1678 * individual, select current.
1679 *
1680 * 2. If current agg is individual and the best is not, keep best.
1681 *
1682 * 3. Therefore, current and best are both individual or both not
1683 * individual, so:
1684 *
1685 * 3a. If current agg partner replied, and best agg partner did not,
1686 * select current.
1687 *
1688 * 3b. If current agg partner did not reply and best agg partner
1689 * did reply, keep best.
1690 *
1691 * 4. Therefore, current and best both have partner replies or
1692 * both do not, so perform selection policy:
1693 *
1694 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1695 * select by bandwidth.
1696 *
1697 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1698 */
1699 if (!best)
1700 return curr;
1701
1702 if (!curr->is_individual && best->is_individual)
1703 return curr;
1704
1705 if (curr->is_individual && !best->is_individual)
1706 return best;
1707
1708 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1709 return curr;
1710
1711 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1712 return best;
1713
1714 switch (__get_agg_selection_mode(curr->lag_ports)) {
1715 case BOND_AD_COUNT:
1716 if (__agg_active_ports(curr) > __agg_active_ports(best))
1717 return curr;
1718
1719 if (__agg_active_ports(curr) < __agg_active_ports(best))
1720 return best;
1721
1722 fallthrough;
1723 case BOND_AD_STABLE:
1724 case BOND_AD_BANDWIDTH:
1725 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1726 return curr;
1727
1728 break;
1729
1730 default:
1731 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n",
1732 curr->slave->bond->dev->name,
1733 curr->slave->dev->name,
1734 __get_agg_selection_mode(curr->lag_ports));
1735 break;
1736 }
1737
1738 return best;
1739}
1740
1741static int agg_device_up(const struct aggregator *agg)
1742{
1743 struct port *port = agg->lag_ports;
1744
1745 if (!port)
1746 return 0;
1747
1748 for (port = agg->lag_ports; port;
1749 port = port->next_port_in_aggregator) {
1750 if (netif_running(port->slave->dev) &&
1751 netif_carrier_ok(port->slave->dev))
1752 return 1;
1753 }
1754
1755 return 0;
1756}
1757
1758/**
1759 * ad_agg_selection_logic - select an aggregation group for a team
1760 * @agg: the aggregator we're looking at
1761 * @update_slave_arr: Does slave array need update?
1762 *
1763 * It is assumed that only one aggregator may be selected for a team.
1764 *
1765 * The logic of this function is to select the aggregator according to
1766 * the ad_select policy:
1767 *
1768 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1769 * it, and to reselect the active aggregator only if the previous
1770 * aggregator has no more ports related to it.
1771 *
1772 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1773 * bandwidth, and reselect whenever a link state change takes place or the
1774 * set of slaves in the bond changes.
1775 *
1776 * BOND_AD_COUNT: select the aggregator with largest number of ports
1777 * (slaves), and reselect whenever a link state change takes place or the
1778 * set of slaves in the bond changes.
1779 *
1780 * FIXME: this function MUST be called with the first agg in the bond, or
1781 * __get_active_agg() won't work correctly. This function should be better
1782 * called with the bond itself, and retrieve the first agg from it.
1783 */
1784static void ad_agg_selection_logic(struct aggregator *agg,
1785 bool *update_slave_arr)
1786{
1787 struct aggregator *best, *active, *origin;
1788 struct bonding *bond = agg->slave->bond;
1789 struct list_head *iter;
1790 struct slave *slave;
1791 struct port *port;
1792
1793 rcu_read_lock();
1794 origin = agg;
1795 active = __get_active_agg(agg);
1796 best = (active && agg_device_up(active)) ? active : NULL;
1797
1798 bond_for_each_slave_rcu(bond, slave, iter) {
1799 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1800
1801 agg->is_active = 0;
1802
1803 if (__agg_active_ports(agg) && agg_device_up(agg))
1804 best = ad_agg_selection_test(best, agg);
1805 }
1806
1807 if (best &&
1808 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1809 /* For the STABLE policy, don't replace the old active
1810 * aggregator if it's still active (it has an answering
1811 * partner) or if both the best and active don't have an
1812 * answering partner.
1813 */
1814 if (active && active->lag_ports &&
1815 __agg_active_ports(active) &&
1816 (__agg_has_partner(active) ||
1817 (!__agg_has_partner(active) &&
1818 !__agg_has_partner(best)))) {
1819 if (!(!active->actor_oper_aggregator_key &&
1820 best->actor_oper_aggregator_key)) {
1821 best = NULL;
1822 active->is_active = 1;
1823 }
1824 }
1825 }
1826
1827 if (best && (best == active)) {
1828 best = NULL;
1829 active->is_active = 1;
1830 }
1831
1832 /* if there is new best aggregator, activate it */
1833 if (best) {
1834 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1835 best->slave ? best->slave->dev->name : "NULL",
1836 best->aggregator_identifier, best->num_of_ports,
1837 best->actor_oper_aggregator_key,
1838 best->partner_oper_aggregator_key,
1839 best->is_individual, best->is_active);
1840 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n",
1841 best->slave ? best->slave->dev->name : "NULL",
1842 best->lag_ports, best->slave);
1843
1844 bond_for_each_slave_rcu(bond, slave, iter) {
1845 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1846
1847 slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1848 agg->aggregator_identifier, agg->num_of_ports,
1849 agg->actor_oper_aggregator_key,
1850 agg->partner_oper_aggregator_key,
1851 agg->is_individual, agg->is_active);
1852 }
1853
1854 /* check if any partner replies */
1855 if (best->is_individual)
1856 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1857 bond->dev->name);
1858
1859 best->is_active = 1;
1860 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n",
1861 best->slave ? best->slave->dev->name : "NULL",
1862 best->aggregator_identifier);
1863 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1864 best->slave ? best->slave->dev->name : "NULL",
1865 best->aggregator_identifier, best->num_of_ports,
1866 best->actor_oper_aggregator_key,
1867 best->partner_oper_aggregator_key,
1868 best->is_individual, best->is_active);
1869
1870 /* disable the ports that were related to the former
1871 * active_aggregator
1872 */
1873 if (active) {
1874 for (port = active->lag_ports; port;
1875 port = port->next_port_in_aggregator) {
1876 __disable_port(port);
1877 }
1878 }
1879 /* Slave array needs update. */
1880 *update_slave_arr = true;
1881 }
1882
1883 /* if the selected aggregator is of join individuals
1884 * (partner_system is NULL), enable their ports
1885 */
1886 active = __get_active_agg(origin);
1887
1888 if (active) {
1889 if (!__agg_has_partner(active)) {
1890 for (port = active->lag_ports; port;
1891 port = port->next_port_in_aggregator) {
1892 __enable_port(port);
1893 }
1894 *update_slave_arr = true;
1895 }
1896 }
1897
1898 rcu_read_unlock();
1899
1900 bond_3ad_set_carrier(bond);
1901}
1902
1903/**
1904 * ad_clear_agg - clear a given aggregator's parameters
1905 * @aggregator: the aggregator we're looking at
1906 */
1907static void ad_clear_agg(struct aggregator *aggregator)
1908{
1909 if (aggregator) {
1910 aggregator->is_individual = false;
1911 aggregator->actor_admin_aggregator_key = 0;
1912 aggregator->actor_oper_aggregator_key = 0;
1913 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1914 aggregator->partner_system_priority = 0;
1915 aggregator->partner_oper_aggregator_key = 0;
1916 aggregator->receive_state = 0;
1917 aggregator->transmit_state = 0;
1918 aggregator->lag_ports = NULL;
1919 aggregator->is_active = 0;
1920 aggregator->num_of_ports = 0;
1921 pr_debug("%s: LAG %d was cleared\n",
1922 aggregator->slave ?
1923 aggregator->slave->dev->name : "NULL",
1924 aggregator->aggregator_identifier);
1925 }
1926}
1927
1928/**
1929 * ad_initialize_agg - initialize a given aggregator's parameters
1930 * @aggregator: the aggregator we're looking at
1931 */
1932static void ad_initialize_agg(struct aggregator *aggregator)
1933{
1934 if (aggregator) {
1935 ad_clear_agg(aggregator);
1936
1937 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1938 aggregator->aggregator_identifier = 0;
1939 aggregator->slave = NULL;
1940 }
1941}
1942
1943/**
1944 * ad_initialize_port - initialize a given port's parameters
1945 * @port: the port we're looking at
1946 * @lacp_fast: boolean. whether fast periodic should be used
1947 */
1948static void ad_initialize_port(struct port *port, int lacp_fast)
1949{
1950 static const struct port_params tmpl = {
1951 .system_priority = 0xffff,
1952 .key = 1,
1953 .port_number = 1,
1954 .port_priority = 0xff,
1955 .port_state = 1,
1956 };
1957 static const struct lacpdu lacpdu = {
1958 .subtype = 0x01,
1959 .version_number = 0x01,
1960 .tlv_type_actor_info = 0x01,
1961 .actor_information_length = 0x14,
1962 .tlv_type_partner_info = 0x02,
1963 .partner_information_length = 0x14,
1964 .tlv_type_collector_info = 0x03,
1965 .collector_information_length = 0x10,
1966 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1967 };
1968
1969 if (port) {
1970 port->actor_port_priority = 0xff;
1971 port->actor_port_aggregator_identifier = 0;
1972 port->ntt = false;
1973 port->actor_admin_port_state = LACP_STATE_AGGREGATION |
1974 LACP_STATE_LACP_ACTIVITY;
1975 port->actor_oper_port_state = LACP_STATE_AGGREGATION |
1976 LACP_STATE_LACP_ACTIVITY;
1977
1978 if (lacp_fast)
1979 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
1980
1981 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1982 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1983
1984 port->is_enabled = true;
1985 /* private parameters */
1986 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1987 port->sm_rx_state = 0;
1988 port->sm_rx_timer_counter = 0;
1989 port->sm_periodic_state = 0;
1990 port->sm_periodic_timer_counter = 0;
1991 port->sm_mux_state = 0;
1992 port->sm_mux_timer_counter = 0;
1993 port->sm_tx_state = 0;
1994 port->aggregator = NULL;
1995 port->next_port_in_aggregator = NULL;
1996 port->transaction_id = 0;
1997
1998 port->sm_churn_actor_timer_counter = 0;
1999 port->sm_churn_actor_state = 0;
2000 port->churn_actor_count = 0;
2001 port->sm_churn_partner_timer_counter = 0;
2002 port->sm_churn_partner_state = 0;
2003 port->churn_partner_count = 0;
2004
2005 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
2006 }
2007}
2008
2009/**
2010 * ad_enable_collecting - enable a port's receive
2011 * @port: the port we're looking at
2012 *
2013 * Enable @port if it's in an active aggregator
2014 */
2015static void ad_enable_collecting(struct port *port)
2016{
2017 if (port->aggregator->is_active) {
2018 struct slave *slave = port->slave;
2019
2020 slave_dbg(slave->bond->dev, slave->dev,
2021 "Enabling collecting on port %d (LAG %d)\n",
2022 port->actor_port_number,
2023 port->aggregator->aggregator_identifier);
2024 __enable_collecting_port(port);
2025 }
2026}
2027
2028/**
2029 * ad_disable_distributing - disable a port's transmit
2030 * @port: the port we're looking at
2031 * @update_slave_arr: Does slave array need update?
2032 */
2033static void ad_disable_distributing(struct port *port, bool *update_slave_arr)
2034{
2035 if (port->aggregator && __agg_has_partner(port->aggregator)) {
2036 slave_dbg(port->slave->bond->dev, port->slave->dev,
2037 "Disabling distributing on port %d (LAG %d)\n",
2038 port->actor_port_number,
2039 port->aggregator->aggregator_identifier);
2040 __disable_distributing_port(port);
2041 /* Slave array needs an update */
2042 *update_slave_arr = true;
2043 }
2044}
2045
2046/**
2047 * ad_enable_collecting_distributing - enable a port's transmit/receive
2048 * @port: the port we're looking at
2049 * @update_slave_arr: Does slave array need update?
2050 *
2051 * Enable @port if it's in an active aggregator
2052 */
2053static void ad_enable_collecting_distributing(struct port *port,
2054 bool *update_slave_arr)
2055{
2056 if (port->aggregator->is_active) {
2057 slave_dbg(port->slave->bond->dev, port->slave->dev,
2058 "Enabling port %d (LAG %d)\n",
2059 port->actor_port_number,
2060 port->aggregator->aggregator_identifier);
2061 __enable_port(port);
2062 /* Slave array needs update */
2063 *update_slave_arr = true;
2064 }
2065}
2066
2067/**
2068 * ad_disable_collecting_distributing - disable a port's transmit/receive
2069 * @port: the port we're looking at
2070 * @update_slave_arr: Does slave array need update?
2071 */
2072static void ad_disable_collecting_distributing(struct port *port,
2073 bool *update_slave_arr)
2074{
2075 if (port->aggregator && __agg_has_partner(port->aggregator)) {
2076 slave_dbg(port->slave->bond->dev, port->slave->dev,
2077 "Disabling port %d (LAG %d)\n",
2078 port->actor_port_number,
2079 port->aggregator->aggregator_identifier);
2080 __disable_port(port);
2081 /* Slave array needs an update */
2082 *update_slave_arr = true;
2083 }
2084}
2085
2086/**
2087 * ad_marker_info_received - handle receive of a Marker information frame
2088 * @marker_info: Marker info received
2089 * @port: the port we're looking at
2090 */
2091static void ad_marker_info_received(struct bond_marker *marker_info,
2092 struct port *port)
2093{
2094 struct bond_marker marker;
2095
2096 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx);
2097 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx);
2098
2099 /* copy the received marker data to the response marker */
2100 memcpy(&marker, marker_info, sizeof(struct bond_marker));
2101 /* change the marker subtype to marker response */
2102 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
2103
2104 /* send the marker response */
2105 if (ad_marker_send(port, &marker) >= 0)
2106 slave_dbg(port->slave->bond->dev, port->slave->dev,
2107 "Sent Marker Response on port %d\n",
2108 port->actor_port_number);
2109}
2110
2111/**
2112 * ad_marker_response_received - handle receive of a marker response frame
2113 * @marker: marker PDU received
2114 * @port: the port we're looking at
2115 *
2116 * This function does nothing since we decided not to implement send and handle
2117 * response for marker PDU's, in this stage, but only to respond to marker
2118 * information.
2119 */
2120static void ad_marker_response_received(struct bond_marker *marker,
2121 struct port *port)
2122{
2123 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx);
2124 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx);
2125
2126 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
2127}
2128
2129/* ========= AD exported functions to the main bonding code ========= */
2130
2131/* Check aggregators status in team every T seconds */
2132#define AD_AGGREGATOR_SELECTION_TIMER 8
2133
2134/**
2135 * bond_3ad_initiate_agg_selection - initate aggregator selection
2136 * @bond: bonding struct
2137 * @timeout: timeout value to set
2138 *
2139 * Set the aggregation selection timer, to initiate an agg selection in
2140 * the very near future. Called during first initialization, and during
2141 * any down to up transitions of the bond.
2142 */
2143void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
2144{
2145 atomic_set(&BOND_AD_INFO(bond).agg_select_timer, timeout);
2146}
2147
2148/**
2149 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
2150 * @bond: bonding struct to work on
2151 *
2152 * Can be called only after the mac address of the bond is set.
2153 */
2154void bond_3ad_initialize(struct bonding *bond)
2155{
2156 BOND_AD_INFO(bond).aggregator_identifier = 0;
2157 BOND_AD_INFO(bond).system.sys_priority =
2158 bond->params.ad_actor_sys_prio;
2159 if (is_zero_ether_addr(bond->params.ad_actor_system))
2160 BOND_AD_INFO(bond).system.sys_mac_addr =
2161 *((struct mac_addr *)bond->dev->dev_addr);
2162 else
2163 BOND_AD_INFO(bond).system.sys_mac_addr =
2164 *((struct mac_addr *)bond->params.ad_actor_system);
2165
2166 bond_3ad_initiate_agg_selection(bond,
2167 AD_AGGREGATOR_SELECTION_TIMER *
2168 ad_ticks_per_sec);
2169}
2170
2171/**
2172 * bond_3ad_bind_slave - initialize a slave's port
2173 * @slave: slave struct to work on
2174 *
2175 * Returns: 0 on success
2176 * < 0 on error
2177 */
2178void bond_3ad_bind_slave(struct slave *slave)
2179{
2180 struct bonding *bond = bond_get_bond_by_slave(slave);
2181 struct port *port;
2182 struct aggregator *aggregator;
2183
2184 /* check that the slave has not been initialized yet. */
2185 if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2186
2187 /* port initialization */
2188 port = &(SLAVE_AD_INFO(slave)->port);
2189
2190 ad_initialize_port(port, bond->params.lacp_fast);
2191
2192 port->slave = slave;
2193 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2194 /* key is determined according to the link speed, duplex and
2195 * user key
2196 */
2197 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2198 ad_update_actor_keys(port, false);
2199 /* actor system is the bond's system */
2200 __ad_actor_update_port(port);
2201 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2202 * lacpdu's are sent in one second)
2203 */
2204 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2205
2206 __disable_port(port);
2207
2208 /* aggregator initialization */
2209 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2210
2211 ad_initialize_agg(aggregator);
2212
2213 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2214 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2215 aggregator->slave = slave;
2216 aggregator->is_active = 0;
2217 aggregator->num_of_ports = 0;
2218 }
2219}
2220
2221/**
2222 * bond_3ad_unbind_slave - deinitialize a slave's port
2223 * @slave: slave struct to work on
2224 *
2225 * Search for the aggregator that is related to this port, remove the
2226 * aggregator and assign another aggregator for other port related to it
2227 * (if any), and remove the port.
2228 */
2229void bond_3ad_unbind_slave(struct slave *slave)
2230{
2231 struct port *port, *prev_port, *temp_port;
2232 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2233 int select_new_active_agg = 0;
2234 struct bonding *bond = slave->bond;
2235 struct slave *slave_iter;
2236 struct list_head *iter;
2237 bool dummy_slave_update; /* Ignore this value as caller updates array */
2238
2239 /* Sync against bond_3ad_state_machine_handler() */
2240 spin_lock_bh(&bond->mode_lock);
2241 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2242 port = &(SLAVE_AD_INFO(slave)->port);
2243
2244 /* if slave is null, the whole port is not initialized */
2245 if (!port->slave) {
2246 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n");
2247 goto out;
2248 }
2249
2250 slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n",
2251 aggregator->aggregator_identifier);
2252
2253 /* Tell the partner that this port is not suitable for aggregation */
2254 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
2255 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
2256 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
2257 port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION;
2258 __update_lacpdu_from_port(port);
2259 ad_lacpdu_send(port);
2260
2261 /* check if this aggregator is occupied */
2262 if (aggregator->lag_ports) {
2263 /* check if there are other ports related to this aggregator
2264 * except the port related to this slave(thats ensure us that
2265 * there is a reason to search for new aggregator, and that we
2266 * will find one
2267 */
2268 if ((aggregator->lag_ports != port) ||
2269 (aggregator->lag_ports->next_port_in_aggregator)) {
2270 /* find new aggregator for the related port(s) */
2271 bond_for_each_slave(bond, slave_iter, iter) {
2272 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2273 /* if the new aggregator is empty, or it is
2274 * connected to our port only
2275 */
2276 if (!new_aggregator->lag_ports ||
2277 ((new_aggregator->lag_ports == port) &&
2278 !new_aggregator->lag_ports->next_port_in_aggregator))
2279 break;
2280 }
2281 if (!slave_iter)
2282 new_aggregator = NULL;
2283
2284 /* if new aggregator found, copy the aggregator's
2285 * parameters and connect the related lag_ports to the
2286 * new aggregator
2287 */
2288 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2289 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2290 aggregator->aggregator_identifier,
2291 new_aggregator->aggregator_identifier);
2292
2293 if ((new_aggregator->lag_ports == port) &&
2294 new_aggregator->is_active) {
2295 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2296 select_new_active_agg = 1;
2297 }
2298
2299 new_aggregator->is_individual = aggregator->is_individual;
2300 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2301 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2302 new_aggregator->partner_system = aggregator->partner_system;
2303 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2304 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2305 new_aggregator->receive_state = aggregator->receive_state;
2306 new_aggregator->transmit_state = aggregator->transmit_state;
2307 new_aggregator->lag_ports = aggregator->lag_ports;
2308 new_aggregator->is_active = aggregator->is_active;
2309 new_aggregator->num_of_ports = aggregator->num_of_ports;
2310
2311 /* update the information that is written on
2312 * the ports about the aggregator
2313 */
2314 for (temp_port = aggregator->lag_ports; temp_port;
2315 temp_port = temp_port->next_port_in_aggregator) {
2316 temp_port->aggregator = new_aggregator;
2317 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2318 }
2319
2320 ad_clear_agg(aggregator);
2321
2322 if (select_new_active_agg)
2323 ad_agg_selection_logic(__get_first_agg(port),
2324 &dummy_slave_update);
2325 } else {
2326 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2327 }
2328 } else {
2329 /* in case that the only port related to this
2330 * aggregator is the one we want to remove
2331 */
2332 select_new_active_agg = aggregator->is_active;
2333 ad_clear_agg(aggregator);
2334 if (select_new_active_agg) {
2335 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2336 /* select new active aggregator */
2337 temp_aggregator = __get_first_agg(port);
2338 if (temp_aggregator)
2339 ad_agg_selection_logic(temp_aggregator,
2340 &dummy_slave_update);
2341 }
2342 }
2343 }
2344
2345 slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number);
2346
2347 /* find the aggregator that this port is connected to */
2348 bond_for_each_slave(bond, slave_iter, iter) {
2349 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2350 prev_port = NULL;
2351 /* search the port in the aggregator's related ports */
2352 for (temp_port = temp_aggregator->lag_ports; temp_port;
2353 prev_port = temp_port,
2354 temp_port = temp_port->next_port_in_aggregator) {
2355 if (temp_port == port) {
2356 /* the aggregator found - detach the port from
2357 * this aggregator
2358 */
2359 if (prev_port)
2360 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2361 else
2362 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2363 temp_aggregator->num_of_ports--;
2364 if (__agg_active_ports(temp_aggregator) == 0) {
2365 select_new_active_agg = temp_aggregator->is_active;
2366 if (temp_aggregator->num_of_ports == 0)
2367 ad_clear_agg(temp_aggregator);
2368 if (select_new_active_agg) {
2369 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2370 /* select new active aggregator */
2371 ad_agg_selection_logic(__get_first_agg(port),
2372 &dummy_slave_update);
2373 }
2374 }
2375 break;
2376 }
2377 }
2378 }
2379 port->slave = NULL;
2380
2381out:
2382 spin_unlock_bh(&bond->mode_lock);
2383}
2384
2385/**
2386 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2387 * @bond: bonding struct to work on
2388 *
2389 * If an ad_actor setting gets changed we need to update the individual port
2390 * settings so the bond device will use the new values when it gets upped.
2391 */
2392void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2393{
2394 struct list_head *iter;
2395 struct slave *slave;
2396
2397 ASSERT_RTNL();
2398
2399 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2400 if (is_zero_ether_addr(bond->params.ad_actor_system))
2401 BOND_AD_INFO(bond).system.sys_mac_addr =
2402 *((struct mac_addr *)bond->dev->dev_addr);
2403 else
2404 BOND_AD_INFO(bond).system.sys_mac_addr =
2405 *((struct mac_addr *)bond->params.ad_actor_system);
2406
2407 spin_lock_bh(&bond->mode_lock);
2408 bond_for_each_slave(bond, slave, iter) {
2409 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2410
2411 __ad_actor_update_port(port);
2412 port->ntt = true;
2413 }
2414 spin_unlock_bh(&bond->mode_lock);
2415}
2416
2417/**
2418 * bond_agg_timer_advance - advance agg_select_timer
2419 * @bond: bonding structure
2420 *
2421 * Return true when agg_select_timer reaches 0.
2422 */
2423static bool bond_agg_timer_advance(struct bonding *bond)
2424{
2425 int val, nval;
2426
2427 while (1) {
2428 val = atomic_read(&BOND_AD_INFO(bond).agg_select_timer);
2429 if (!val)
2430 return false;
2431 nval = val - 1;
2432 if (atomic_cmpxchg(&BOND_AD_INFO(bond).agg_select_timer,
2433 val, nval) == val)
2434 break;
2435 }
2436 return nval == 0;
2437}
2438
2439/**
2440 * bond_3ad_state_machine_handler - handle state machines timeout
2441 * @work: work context to fetch bonding struct to work on from
2442 *
2443 * The state machine handling concept in this module is to check every tick
2444 * which state machine should operate any function. The execution order is
2445 * round robin, so when we have an interaction between state machines, the
2446 * reply of one to each other might be delayed until next tick.
2447 *
2448 * This function also complete the initialization when the agg_select_timer
2449 * times out, and it selects an aggregator for the ports that are yet not
2450 * related to any aggregator, and selects the active aggregator for a bond.
2451 */
2452void bond_3ad_state_machine_handler(struct work_struct *work)
2453{
2454 struct bonding *bond = container_of(work, struct bonding,
2455 ad_work.work);
2456 struct aggregator *aggregator;
2457 struct list_head *iter;
2458 struct slave *slave;
2459 struct port *port;
2460 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2461 bool update_slave_arr = false;
2462
2463 /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2464 * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2465 * concurrently due to incoming LACPDU as well.
2466 */
2467 spin_lock_bh(&bond->mode_lock);
2468 rcu_read_lock();
2469
2470 /* check if there are any slaves */
2471 if (!bond_has_slaves(bond))
2472 goto re_arm;
2473
2474 if (bond_agg_timer_advance(bond)) {
2475 slave = bond_first_slave_rcu(bond);
2476 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2477
2478 /* select the active aggregator for the bond */
2479 if (port) {
2480 if (!port->slave) {
2481 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2482 bond->dev->name);
2483 goto re_arm;
2484 }
2485
2486 aggregator = __get_first_agg(port);
2487 ad_agg_selection_logic(aggregator, &update_slave_arr);
2488 }
2489 bond_3ad_set_carrier(bond);
2490 }
2491
2492 /* for each port run the state machines */
2493 bond_for_each_slave_rcu(bond, slave, iter) {
2494 port = &(SLAVE_AD_INFO(slave)->port);
2495 if (!port->slave) {
2496 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2497 bond->dev->name);
2498 goto re_arm;
2499 }
2500
2501 ad_rx_machine(NULL, port);
2502 ad_periodic_machine(port, &bond->params);
2503 ad_port_selection_logic(port, &update_slave_arr);
2504 ad_mux_machine(port, &update_slave_arr);
2505 ad_tx_machine(port);
2506 ad_churn_machine(port);
2507
2508 /* turn off the BEGIN bit, since we already handled it */
2509 if (port->sm_vars & AD_PORT_BEGIN)
2510 port->sm_vars &= ~AD_PORT_BEGIN;
2511 }
2512
2513re_arm:
2514 bond_for_each_slave_rcu(bond, slave, iter) {
2515 if (slave->should_notify) {
2516 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2517 break;
2518 }
2519 }
2520 rcu_read_unlock();
2521 spin_unlock_bh(&bond->mode_lock);
2522
2523 if (update_slave_arr)
2524 bond_slave_arr_work_rearm(bond, 0);
2525
2526 if (should_notify_rtnl && rtnl_trylock()) {
2527 bond_slave_state_notify(bond);
2528 rtnl_unlock();
2529 }
2530 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2531}
2532
2533/**
2534 * bond_3ad_rx_indication - handle a received frame
2535 * @lacpdu: received lacpdu
2536 * @slave: slave struct to work on
2537 *
2538 * It is assumed that frames that were sent on this NIC don't returned as new
2539 * received frames (loopback). Since only the payload is given to this
2540 * function, it check for loopback.
2541 */
2542static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave)
2543{
2544 struct bonding *bond = slave->bond;
2545 int ret = RX_HANDLER_ANOTHER;
2546 struct bond_marker *marker;
2547 struct port *port;
2548 atomic64_t *stat;
2549
2550 port = &(SLAVE_AD_INFO(slave)->port);
2551 if (!port->slave) {
2552 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2553 slave->dev->name, slave->bond->dev->name);
2554 return ret;
2555 }
2556
2557 switch (lacpdu->subtype) {
2558 case AD_TYPE_LACPDU:
2559 ret = RX_HANDLER_CONSUMED;
2560 slave_dbg(slave->bond->dev, slave->dev,
2561 "Received LACPDU on port %d\n",
2562 port->actor_port_number);
2563 /* Protect against concurrent state machines */
2564 spin_lock(&slave->bond->mode_lock);
2565 ad_rx_machine(lacpdu, port);
2566 spin_unlock(&slave->bond->mode_lock);
2567 break;
2568 case AD_TYPE_MARKER:
2569 ret = RX_HANDLER_CONSUMED;
2570 /* No need to convert fields to Little Endian since we
2571 * don't use the marker's fields.
2572 */
2573 marker = (struct bond_marker *)lacpdu;
2574 switch (marker->tlv_type) {
2575 case AD_MARKER_INFORMATION_SUBTYPE:
2576 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n",
2577 port->actor_port_number);
2578 ad_marker_info_received(marker, port);
2579 break;
2580 case AD_MARKER_RESPONSE_SUBTYPE:
2581 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n",
2582 port->actor_port_number);
2583 ad_marker_response_received(marker, port);
2584 break;
2585 default:
2586 slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n",
2587 port->actor_port_number);
2588 stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx;
2589 atomic64_inc(stat);
2590 stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx;
2591 atomic64_inc(stat);
2592 }
2593 break;
2594 default:
2595 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx);
2596 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx);
2597 }
2598
2599 return ret;
2600}
2601
2602/**
2603 * ad_update_actor_keys - Update the oper / admin keys for a port based on
2604 * its current speed and duplex settings.
2605 *
2606 * @port: the port we'are looking at
2607 * @reset: Boolean to just reset the speed and the duplex part of the key
2608 *
2609 * The logic to change the oper / admin keys is:
2610 * (a) A full duplex port can participate in LACP with partner.
2611 * (b) When the speed is changed, LACP need to be reinitiated.
2612 */
2613static void ad_update_actor_keys(struct port *port, bool reset)
2614{
2615 u8 duplex = 0;
2616 u16 ospeed = 0, speed = 0;
2617 u16 old_oper_key = port->actor_oper_port_key;
2618
2619 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2620 if (!reset) {
2621 speed = __get_link_speed(port);
2622 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2623 duplex = __get_duplex(port);
2624 port->actor_admin_port_key |= (speed << 1) | duplex;
2625 }
2626 port->actor_oper_port_key = port->actor_admin_port_key;
2627
2628 if (old_oper_key != port->actor_oper_port_key) {
2629 /* Only 'duplex' port participates in LACP */
2630 if (duplex)
2631 port->sm_vars |= AD_PORT_LACP_ENABLED;
2632 else
2633 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2634
2635 if (!reset) {
2636 if (!speed) {
2637 slave_err(port->slave->bond->dev,
2638 port->slave->dev,
2639 "speed changed to 0 on port %d\n",
2640 port->actor_port_number);
2641 } else if (duplex && ospeed != speed) {
2642 /* Speed change restarts LACP state-machine */
2643 port->sm_vars |= AD_PORT_BEGIN;
2644 }
2645 }
2646 }
2647}
2648
2649/**
2650 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2651 * change indication
2652 *
2653 * @slave: slave struct to work on
2654 *
2655 * Handle reselection of aggregator (if needed) for this port.
2656 */
2657void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2658{
2659 struct port *port;
2660
2661 port = &(SLAVE_AD_INFO(slave)->port);
2662
2663 /* if slave is null, the whole port is not initialized */
2664 if (!port->slave) {
2665 slave_warn(slave->bond->dev, slave->dev,
2666 "speed/duplex changed for uninitialized port\n");
2667 return;
2668 }
2669
2670 spin_lock_bh(&slave->bond->mode_lock);
2671 ad_update_actor_keys(port, false);
2672 spin_unlock_bh(&slave->bond->mode_lock);
2673 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n",
2674 port->actor_port_number);
2675}
2676
2677/**
2678 * bond_3ad_handle_link_change - handle a slave's link status change indication
2679 * @slave: slave struct to work on
2680 * @link: whether the link is now up or down
2681 *
2682 * Handle reselection of aggregator (if needed) for this port.
2683 */
2684void bond_3ad_handle_link_change(struct slave *slave, char link)
2685{
2686 struct aggregator *agg;
2687 struct port *port;
2688 bool dummy;
2689
2690 port = &(SLAVE_AD_INFO(slave)->port);
2691
2692 /* if slave is null, the whole port is not initialized */
2693 if (!port->slave) {
2694 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n");
2695 return;
2696 }
2697
2698 spin_lock_bh(&slave->bond->mode_lock);
2699 /* on link down we are zeroing duplex and speed since
2700 * some of the adaptors(ce1000.lan) report full duplex/speed
2701 * instead of N/A(duplex) / 0(speed).
2702 *
2703 * on link up we are forcing recheck on the duplex and speed since
2704 * some of he adaptors(ce1000.lan) report.
2705 */
2706 if (link == BOND_LINK_UP) {
2707 port->is_enabled = true;
2708 ad_update_actor_keys(port, false);
2709 } else {
2710 /* link has failed */
2711 port->is_enabled = false;
2712 ad_update_actor_keys(port, true);
2713 }
2714 agg = __get_first_agg(port);
2715 ad_agg_selection_logic(agg, &dummy);
2716
2717 spin_unlock_bh(&slave->bond->mode_lock);
2718
2719 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n",
2720 port->actor_port_number,
2721 link == BOND_LINK_UP ? "UP" : "DOWN");
2722
2723 /* RTNL is held and mode_lock is released so it's safe
2724 * to update slave_array here.
2725 */
2726 bond_update_slave_arr(slave->bond, NULL);
2727}
2728
2729/**
2730 * bond_3ad_set_carrier - set link state for bonding master
2731 * @bond: bonding structure
2732 *
2733 * if we have an active aggregator, we're up, if not, we're down.
2734 * Presumes that we cannot have an active aggregator if there are
2735 * no slaves with link up.
2736 *
2737 * This behavior complies with IEEE 802.3 section 43.3.9.
2738 *
2739 * Called by bond_set_carrier(). Return zero if carrier state does not
2740 * change, nonzero if it does.
2741 */
2742int bond_3ad_set_carrier(struct bonding *bond)
2743{
2744 struct aggregator *active;
2745 struct slave *first_slave;
2746 int ret = 1;
2747
2748 rcu_read_lock();
2749 first_slave = bond_first_slave_rcu(bond);
2750 if (!first_slave) {
2751 ret = 0;
2752 goto out;
2753 }
2754 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2755 if (active) {
2756 /* are enough slaves available to consider link up? */
2757 if (__agg_active_ports(active) < bond->params.min_links) {
2758 if (netif_carrier_ok(bond->dev)) {
2759 netif_carrier_off(bond->dev);
2760 goto out;
2761 }
2762 } else if (!netif_carrier_ok(bond->dev)) {
2763 netif_carrier_on(bond->dev);
2764 goto out;
2765 }
2766 } else if (netif_carrier_ok(bond->dev)) {
2767 netif_carrier_off(bond->dev);
2768 }
2769out:
2770 rcu_read_unlock();
2771 return ret;
2772}
2773
2774/**
2775 * __bond_3ad_get_active_agg_info - get information of the active aggregator
2776 * @bond: bonding struct to work on
2777 * @ad_info: ad_info struct to fill with the bond's info
2778 *
2779 * Returns: 0 on success
2780 * < 0 on error
2781 */
2782int __bond_3ad_get_active_agg_info(struct bonding *bond,
2783 struct ad_info *ad_info)
2784{
2785 struct aggregator *aggregator = NULL;
2786 struct list_head *iter;
2787 struct slave *slave;
2788 struct port *port;
2789
2790 bond_for_each_slave_rcu(bond, slave, iter) {
2791 port = &(SLAVE_AD_INFO(slave)->port);
2792 if (port->aggregator && port->aggregator->is_active) {
2793 aggregator = port->aggregator;
2794 break;
2795 }
2796 }
2797
2798 if (!aggregator)
2799 return -1;
2800
2801 ad_info->aggregator_id = aggregator->aggregator_identifier;
2802 ad_info->ports = __agg_active_ports(aggregator);
2803 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2804 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2805 ether_addr_copy(ad_info->partner_system,
2806 aggregator->partner_system.mac_addr_value);
2807 return 0;
2808}
2809
2810int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2811{
2812 int ret;
2813
2814 rcu_read_lock();
2815 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2816 rcu_read_unlock();
2817
2818 return ret;
2819}
2820
2821int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2822 struct slave *slave)
2823{
2824 struct lacpdu *lacpdu, _lacpdu;
2825
2826 if (skb->protocol != PKT_TYPE_LACPDU)
2827 return RX_HANDLER_ANOTHER;
2828
2829 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2830 return RX_HANDLER_ANOTHER;
2831
2832 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2833 if (!lacpdu) {
2834 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx);
2835 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx);
2836 return RX_HANDLER_ANOTHER;
2837 }
2838
2839 return bond_3ad_rx_indication(lacpdu, slave);
2840}
2841
2842/**
2843 * bond_3ad_update_lacp_rate - change the lacp rate
2844 * @bond: bonding struct
2845 *
2846 * When modify lacp_rate parameter via sysfs,
2847 * update actor_oper_port_state of each port.
2848 *
2849 * Hold bond->mode_lock,
2850 * so we can modify port->actor_oper_port_state,
2851 * no matter bond is up or down.
2852 */
2853void bond_3ad_update_lacp_rate(struct bonding *bond)
2854{
2855 struct port *port = NULL;
2856 struct list_head *iter;
2857 struct slave *slave;
2858 int lacp_fast;
2859
2860 lacp_fast = bond->params.lacp_fast;
2861 spin_lock_bh(&bond->mode_lock);
2862 bond_for_each_slave(bond, slave, iter) {
2863 port = &(SLAVE_AD_INFO(slave)->port);
2864 if (lacp_fast)
2865 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
2866 else
2867 port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT;
2868 }
2869 spin_unlock_bh(&bond->mode_lock);
2870}
2871
2872size_t bond_3ad_stats_size(void)
2873{
2874 return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */
2875 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */
2876 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */
2877 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */
2878 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */
2879 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */
2880 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */
2881 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */
2882 nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */
2883}
2884
2885int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats)
2886{
2887 u64 val;
2888
2889 val = atomic64_read(&stats->lacpdu_rx);
2890 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val,
2891 BOND_3AD_STAT_PAD))
2892 return -EMSGSIZE;
2893 val = atomic64_read(&stats->lacpdu_tx);
2894 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val,
2895 BOND_3AD_STAT_PAD))
2896 return -EMSGSIZE;
2897 val = atomic64_read(&stats->lacpdu_unknown_rx);
2898 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val,
2899 BOND_3AD_STAT_PAD))
2900 return -EMSGSIZE;
2901 val = atomic64_read(&stats->lacpdu_illegal_rx);
2902 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val,
2903 BOND_3AD_STAT_PAD))
2904 return -EMSGSIZE;
2905
2906 val = atomic64_read(&stats->marker_rx);
2907 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val,
2908 BOND_3AD_STAT_PAD))
2909 return -EMSGSIZE;
2910 val = atomic64_read(&stats->marker_tx);
2911 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val,
2912 BOND_3AD_STAT_PAD))
2913 return -EMSGSIZE;
2914 val = atomic64_read(&stats->marker_resp_rx);
2915 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val,
2916 BOND_3AD_STAT_PAD))
2917 return -EMSGSIZE;
2918 val = atomic64_read(&stats->marker_resp_tx);
2919 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val,
2920 BOND_3AD_STAT_PAD))
2921 return -EMSGSIZE;
2922 val = atomic64_read(&stats->marker_unknown_rx);
2923 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val,
2924 BOND_3AD_STAT_PAD))
2925 return -EMSGSIZE;
2926
2927 return 0;
2928}
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}