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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/skbuff.h>
26#include <linux/if_ether.h>
27#include <linux/netdevice.h>
28#include <linux/spinlock.h>
29#include <linux/ethtool.h>
30#include <linux/etherdevice.h>
31#include <linux/if_bonding.h>
32#include <linux/pkt_sched.h>
33#include <net/net_namespace.h>
34#include "bonding.h"
35#include "bond_3ad.h"
36
37/* General definitions */
38#define AD_SHORT_TIMEOUT 1
39#define AD_LONG_TIMEOUT 0
40#define AD_STANDBY 0x2
41#define AD_MAX_TX_IN_SECOND 3
42#define AD_COLLECTOR_MAX_DELAY 0
43
44/* Timer definitions (43.4.4 in the 802.3ad standard) */
45#define AD_FAST_PERIODIC_TIME 1
46#define AD_SLOW_PERIODIC_TIME 30
47#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
48#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
49#define AD_CHURN_DETECTION_TIME 60
50#define AD_AGGREGATE_WAIT_TIME 2
51
52/* Port state definitions (43.4.2.2 in the 802.3ad standard) */
53#define AD_STATE_LACP_ACTIVITY 0x1
54#define AD_STATE_LACP_TIMEOUT 0x2
55#define AD_STATE_AGGREGATION 0x4
56#define AD_STATE_SYNCHRONIZATION 0x8
57#define AD_STATE_COLLECTING 0x10
58#define AD_STATE_DISTRIBUTING 0x20
59#define AD_STATE_DEFAULTED 0x40
60#define AD_STATE_EXPIRED 0x80
61
62/* Port Variables definitions used by the State Machines (43.4.7 in the
63 * 802.3ad standard)
64 */
65#define AD_PORT_BEGIN 0x1
66#define AD_PORT_LACP_ENABLED 0x2
67#define AD_PORT_ACTOR_CHURN 0x4
68#define AD_PORT_PARTNER_CHURN 0x8
69#define AD_PORT_READY 0x10
70#define AD_PORT_READY_N 0x20
71#define AD_PORT_MATCHED 0x40
72#define AD_PORT_STANDBY 0x80
73#define AD_PORT_SELECTED 0x100
74#define AD_PORT_MOVED 0x200
75
76/* Port Key definitions
77 * key is determined according to the link speed, duplex and
78 * user key (which is yet not supported)
79 * --------------------------------------------------------------
80 * Port key : | User key | Speed | Duplex |
81 * --------------------------------------------------------------
82 * 16 6 1 0
83 */
84#define AD_DUPLEX_KEY_BITS 0x1
85#define AD_SPEED_KEY_BITS 0x3E
86#define AD_USER_KEY_BITS 0xFFC0
87
88#define AD_LINK_SPEED_BITMASK_1MBPS 0x1
89#define AD_LINK_SPEED_BITMASK_10MBPS 0x2
90#define AD_LINK_SPEED_BITMASK_100MBPS 0x4
91#define AD_LINK_SPEED_BITMASK_1000MBPS 0x8
92#define AD_LINK_SPEED_BITMASK_10000MBPS 0x10
93
94/* compare MAC addresses */
95#define MAC_ADDRESS_EQUAL(A, B) \
96 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
97
98static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
99static u16 ad_ticks_per_sec;
100static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
101
102static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
103
104/* ================= main 802.3ad protocol functions ================== */
105static int ad_lacpdu_send(struct port *port);
106static int ad_marker_send(struct port *port, struct bond_marker *marker);
107static void ad_mux_machine(struct port *port);
108static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
109static void ad_tx_machine(struct port *port);
110static void ad_periodic_machine(struct port *port);
111static void ad_port_selection_logic(struct port *port);
112static void ad_agg_selection_logic(struct aggregator *aggregator);
113static void ad_clear_agg(struct aggregator *aggregator);
114static void ad_initialize_agg(struct aggregator *aggregator);
115static void ad_initialize_port(struct port *port, int lacp_fast);
116static void ad_enable_collecting_distributing(struct port *port);
117static void ad_disable_collecting_distributing(struct port *port);
118static void ad_marker_info_received(struct bond_marker *marker_info,
119 struct port *port);
120static void ad_marker_response_received(struct bond_marker *marker,
121 struct port *port);
122
123
124/* ================= api to bonding and kernel code ================== */
125
126/**
127 * __get_bond_by_port - get the port's bonding struct
128 * @port: the port we're looking at
129 *
130 * Return @port's bonding struct, or %NULL if it can't be found.
131 */
132static inline struct bonding *__get_bond_by_port(struct port *port)
133{
134 if (port->slave == NULL)
135 return NULL;
136
137 return bond_get_bond_by_slave(port->slave);
138}
139
140/**
141 * __get_first_agg - get the first aggregator in the bond
142 * @bond: the bond we're looking at
143 *
144 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
145 * found.
146 * The caller must hold RCU or RTNL lock.
147 */
148static inline struct aggregator *__get_first_agg(struct port *port)
149{
150 struct bonding *bond = __get_bond_by_port(port);
151 struct slave *first_slave;
152 struct aggregator *agg;
153
154 /* If there's no bond for this port, or bond has no slaves */
155 if (bond == NULL)
156 return NULL;
157
158 rcu_read_lock();
159 first_slave = bond_first_slave_rcu(bond);
160 agg = first_slave ? &(SLAVE_AD_INFO(first_slave).aggregator) : NULL;
161 rcu_read_unlock();
162
163 return agg;
164}
165
166/**
167 * __agg_has_partner - see if we have a partner
168 * @agg: the agregator we're looking at
169 *
170 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
171 * address for the partner). Return 0 if not.
172 */
173static inline int __agg_has_partner(struct aggregator *agg)
174{
175 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
176}
177
178/**
179 * __disable_port - disable the port's slave
180 * @port: the port we're looking at
181 */
182static inline void __disable_port(struct port *port)
183{
184 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
185}
186
187/**
188 * __enable_port - enable the port's slave, if it's up
189 * @port: the port we're looking at
190 */
191static inline void __enable_port(struct port *port)
192{
193 struct slave *slave = port->slave;
194
195 if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
196 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
197}
198
199/**
200 * __port_is_enabled - check if the port's slave is in active state
201 * @port: the port we're looking at
202 */
203static inline int __port_is_enabled(struct port *port)
204{
205 return bond_is_active_slave(port->slave);
206}
207
208/**
209 * __get_agg_selection_mode - get the aggregator selection mode
210 * @port: the port we're looking at
211 *
212 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
213 */
214static inline u32 __get_agg_selection_mode(struct port *port)
215{
216 struct bonding *bond = __get_bond_by_port(port);
217
218 if (bond == NULL)
219 return BOND_AD_STABLE;
220
221 return bond->params.ad_select;
222}
223
224/**
225 * __check_agg_selection_timer - check if the selection timer has expired
226 * @port: the port we're looking at
227 */
228static inline int __check_agg_selection_timer(struct port *port)
229{
230 struct bonding *bond = __get_bond_by_port(port);
231
232 if (bond == NULL)
233 return 0;
234
235 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
236}
237
238/**
239 * __get_state_machine_lock - lock the port's state machines
240 * @port: the port we're looking at
241 */
242static inline void __get_state_machine_lock(struct port *port)
243{
244 spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
245}
246
247/**
248 * __release_state_machine_lock - unlock the port's state machines
249 * @port: the port we're looking at
250 */
251static inline void __release_state_machine_lock(struct port *port)
252{
253 spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
254}
255
256/**
257 * __get_link_speed - get a port's speed
258 * @port: the port we're looking at
259 *
260 * Return @port's speed in 802.3ad bitmask format. i.e. one of:
261 * 0,
262 * %AD_LINK_SPEED_BITMASK_10MBPS,
263 * %AD_LINK_SPEED_BITMASK_100MBPS,
264 * %AD_LINK_SPEED_BITMASK_1000MBPS,
265 * %AD_LINK_SPEED_BITMASK_10000MBPS
266 */
267static u16 __get_link_speed(struct port *port)
268{
269 struct slave *slave = port->slave;
270 u16 speed;
271
272 /* this if covers only a special case: when the configuration starts
273 * with link down, it sets the speed to 0.
274 * This is done in spite of the fact that the e100 driver reports 0
275 * to be compatible with MVT in the future.
276 */
277 if (slave->link != BOND_LINK_UP)
278 speed = 0;
279 else {
280 switch (slave->speed) {
281 case SPEED_10:
282 speed = AD_LINK_SPEED_BITMASK_10MBPS;
283 break;
284
285 case SPEED_100:
286 speed = AD_LINK_SPEED_BITMASK_100MBPS;
287 break;
288
289 case SPEED_1000:
290 speed = AD_LINK_SPEED_BITMASK_1000MBPS;
291 break;
292
293 case SPEED_10000:
294 speed = AD_LINK_SPEED_BITMASK_10000MBPS;
295 break;
296
297 default:
298 /* unknown speed value from ethtool. shouldn't happen */
299 speed = 0;
300 break;
301 }
302 }
303
304 pr_debug("Port %d Received link speed %d update from adapter\n",
305 port->actor_port_number, speed);
306 return speed;
307}
308
309/**
310 * __get_duplex - get a port's duplex
311 * @port: the port we're looking at
312 *
313 * Return @port's duplex in 802.3ad bitmask format. i.e.:
314 * 0x01 if in full duplex
315 * 0x00 otherwise
316 */
317static u8 __get_duplex(struct port *port)
318{
319 struct slave *slave = port->slave;
320
321 u8 retval;
322
323 /* handling a special case: when the configuration starts with
324 * link down, it sets the duplex to 0.
325 */
326 if (slave->link != BOND_LINK_UP)
327 retval = 0x0;
328 else {
329 switch (slave->duplex) {
330 case DUPLEX_FULL:
331 retval = 0x1;
332 pr_debug("Port %d Received status full duplex update from adapter\n",
333 port->actor_port_number);
334 break;
335 case DUPLEX_HALF:
336 default:
337 retval = 0x0;
338 pr_debug("Port %d Received status NOT full duplex update from adapter\n",
339 port->actor_port_number);
340 break;
341 }
342 }
343 return retval;
344}
345
346/**
347 * __initialize_port_locks - initialize a port's STATE machine spinlock
348 * @port: the slave of the port we're looking at
349 */
350static inline void __initialize_port_locks(struct slave *slave)
351{
352 /* make sure it isn't called twice */
353 spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
354}
355
356/* Conversions */
357
358/**
359 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
360 * @timer_type: which timer to operate
361 * @par: timer parameter. see below
362 *
363 * If @timer_type is %current_while_timer, @par indicates long/short timer.
364 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
365 * %SLOW_PERIODIC_TIME.
366 */
367static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
368{
369 u16 retval = 0; /* to silence the compiler */
370
371 switch (timer_type) {
372 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
373 if (par)
374 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
375 else
376 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
377 break;
378 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
379 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
380 break;
381 case AD_PERIODIC_TIMER: /* for periodic machine */
382 retval = (par*ad_ticks_per_sec); /* long timeout */
383 break;
384 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
385 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
386 break;
387 case AD_WAIT_WHILE_TIMER: /* for selection machine */
388 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
389 break;
390 }
391
392 return retval;
393}
394
395
396/* ================= ad_rx_machine helper functions ================== */
397
398/**
399 * __choose_matched - update a port's matched variable from a received lacpdu
400 * @lacpdu: the lacpdu we've received
401 * @port: the port we're looking at
402 *
403 * Update the value of the matched variable, using parameter values from a
404 * newly received lacpdu. Parameter values for the partner carried in the
405 * received PDU are compared with the corresponding operational parameter
406 * values for the actor. Matched is set to TRUE if all of these parameters
407 * match and the PDU parameter partner_state.aggregation has the same value as
408 * actor_oper_port_state.aggregation and lacp will actively maintain the link
409 * in the aggregation. Matched is also set to TRUE if the value of
410 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
411 * an individual link and lacp will actively maintain the link. Otherwise,
412 * matched is set to FALSE. LACP is considered to be actively maintaining the
413 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
414 * the actor's actor_oper_port_state.lacp_activity and the PDU's
415 * partner_state.lacp_activity variables are TRUE.
416 *
417 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
418 * used here to implement the language from 802.3ad 43.4.9 that requires
419 * recordPDU to "match" the LACPDU parameters to the stored values.
420 */
421static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
422{
423 /* check if all parameters are alike
424 * or this is individual link(aggregation == FALSE)
425 * then update the state machine Matched variable.
426 */
427 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
428 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
429 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
430 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
431 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
432 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
433 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
434 ) {
435 port->sm_vars |= AD_PORT_MATCHED;
436 } else {
437 port->sm_vars &= ~AD_PORT_MATCHED;
438 }
439}
440
441/**
442 * __record_pdu - record parameters from a received lacpdu
443 * @lacpdu: the lacpdu we've received
444 * @port: the port we're looking at
445 *
446 * Record the parameter values for the Actor carried in a received lacpdu as
447 * the current partner operational parameter values and sets
448 * actor_oper_port_state.defaulted to FALSE.
449 */
450static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
451{
452 if (lacpdu && port) {
453 struct port_params *partner = &port->partner_oper;
454
455 __choose_matched(lacpdu, port);
456 /* record the new parameter values for the partner
457 * operational
458 */
459 partner->port_number = ntohs(lacpdu->actor_port);
460 partner->port_priority = ntohs(lacpdu->actor_port_priority);
461 partner->system = lacpdu->actor_system;
462 partner->system_priority = ntohs(lacpdu->actor_system_priority);
463 partner->key = ntohs(lacpdu->actor_key);
464 partner->port_state = lacpdu->actor_state;
465
466 /* set actor_oper_port_state.defaulted to FALSE */
467 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
468
469 /* set the partner sync. to on if the partner is sync,
470 * and the port is matched
471 */
472 if ((port->sm_vars & AD_PORT_MATCHED)
473 && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
474 partner->port_state |= AD_STATE_SYNCHRONIZATION;
475 else
476 partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
477 }
478}
479
480/**
481 * __record_default - record default parameters
482 * @port: the port we're looking at
483 *
484 * This function records the default parameter values for the partner carried
485 * in the Partner Admin parameters as the current partner operational parameter
486 * values and sets actor_oper_port_state.defaulted to TRUE.
487 */
488static void __record_default(struct port *port)
489{
490 if (port) {
491 /* record the partner admin parameters */
492 memcpy(&port->partner_oper, &port->partner_admin,
493 sizeof(struct port_params));
494
495 /* set actor_oper_port_state.defaulted to true */
496 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
497 }
498}
499
500/**
501 * __update_selected - update a port's Selected variable from a received lacpdu
502 * @lacpdu: the lacpdu we've received
503 * @port: the port we're looking at
504 *
505 * Update the value of the selected variable, using parameter values from a
506 * newly received lacpdu. The parameter values for the Actor carried in the
507 * received PDU are compared with the corresponding operational parameter
508 * values for the ports partner. If one or more of the comparisons shows that
509 * the value(s) received in the PDU differ from the current operational values,
510 * then selected is set to FALSE and actor_oper_port_state.synchronization is
511 * set to out_of_sync. Otherwise, selected remains unchanged.
512 */
513static void __update_selected(struct lacpdu *lacpdu, struct port *port)
514{
515 if (lacpdu && port) {
516 const struct port_params *partner = &port->partner_oper;
517
518 /* check if any parameter is different then
519 * update the state machine selected variable.
520 */
521 if (ntohs(lacpdu->actor_port) != partner->port_number ||
522 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
523 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
524 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
525 ntohs(lacpdu->actor_key) != partner->key ||
526 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
527 port->sm_vars &= ~AD_PORT_SELECTED;
528 }
529 }
530}
531
532/**
533 * __update_default_selected - update a port's Selected variable from Partner
534 * @port: the port we're looking at
535 *
536 * This function updates the value of the selected variable, using the partner
537 * administrative parameter values. The administrative values are compared with
538 * the corresponding operational parameter values for the partner. If one or
539 * more of the comparisons shows that the administrative value(s) differ from
540 * the current operational values, then Selected is set to FALSE and
541 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
542 * Selected remains unchanged.
543 */
544static void __update_default_selected(struct port *port)
545{
546 if (port) {
547 const struct port_params *admin = &port->partner_admin;
548 const struct port_params *oper = &port->partner_oper;
549
550 /* check if any parameter is different then
551 * update the state machine selected variable.
552 */
553 if (admin->port_number != oper->port_number ||
554 admin->port_priority != oper->port_priority ||
555 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
556 admin->system_priority != oper->system_priority ||
557 admin->key != oper->key ||
558 (admin->port_state & AD_STATE_AGGREGATION)
559 != (oper->port_state & AD_STATE_AGGREGATION)) {
560 port->sm_vars &= ~AD_PORT_SELECTED;
561 }
562 }
563}
564
565/**
566 * __update_ntt - update a port's ntt variable from a received lacpdu
567 * @lacpdu: the lacpdu we've received
568 * @port: the port we're looking at
569 *
570 * Updates the value of the ntt variable, using parameter values from a newly
571 * received lacpdu. The parameter values for the partner carried in the
572 * received PDU are compared with the corresponding operational parameter
573 * values for the Actor. If one or more of the comparisons shows that the
574 * value(s) received in the PDU differ from the current operational values,
575 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
576 */
577static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
578{
579 /* validate lacpdu and port */
580 if (lacpdu && port) {
581 /* check if any parameter is different then
582 * update the port->ntt.
583 */
584 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
585 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
586 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
587 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
588 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
589 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
590 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
591 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
592 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
593 ) {
594 port->ntt = true;
595 }
596 }
597}
598
599/**
600 * __agg_ports_are_ready - check if all ports in an aggregator are ready
601 * @aggregator: the aggregator we're looking at
602 *
603 */
604static int __agg_ports_are_ready(struct aggregator *aggregator)
605{
606 struct port *port;
607 int retval = 1;
608
609 if (aggregator) {
610 /* scan all ports in this aggregator to verfy if they are
611 * all ready.
612 */
613 for (port = aggregator->lag_ports;
614 port;
615 port = port->next_port_in_aggregator) {
616 if (!(port->sm_vars & AD_PORT_READY_N)) {
617 retval = 0;
618 break;
619 }
620 }
621 }
622
623 return retval;
624}
625
626/**
627 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
628 * @aggregator: the aggregator we're looking at
629 * @val: Should the ports' ready bit be set on or off
630 *
631 */
632static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
633{
634 struct port *port;
635
636 for (port = aggregator->lag_ports; port;
637 port = port->next_port_in_aggregator) {
638 if (val)
639 port->sm_vars |= AD_PORT_READY;
640 else
641 port->sm_vars &= ~AD_PORT_READY;
642 }
643}
644
645/**
646 * __get_agg_bandwidth - get the total bandwidth of an aggregator
647 * @aggregator: the aggregator we're looking at
648 *
649 */
650static u32 __get_agg_bandwidth(struct aggregator *aggregator)
651{
652 u32 bandwidth = 0;
653
654 if (aggregator->num_of_ports) {
655 switch (__get_link_speed(aggregator->lag_ports)) {
656 case AD_LINK_SPEED_BITMASK_1MBPS:
657 bandwidth = aggregator->num_of_ports;
658 break;
659 case AD_LINK_SPEED_BITMASK_10MBPS:
660 bandwidth = aggregator->num_of_ports * 10;
661 break;
662 case AD_LINK_SPEED_BITMASK_100MBPS:
663 bandwidth = aggregator->num_of_ports * 100;
664 break;
665 case AD_LINK_SPEED_BITMASK_1000MBPS:
666 bandwidth = aggregator->num_of_ports * 1000;
667 break;
668 case AD_LINK_SPEED_BITMASK_10000MBPS:
669 bandwidth = aggregator->num_of_ports * 10000;
670 break;
671 default:
672 bandwidth = 0; /* to silence the compiler */
673 }
674 }
675 return bandwidth;
676}
677
678/**
679 * __get_active_agg - get the current active aggregator
680 * @aggregator: the aggregator we're looking at
681 *
682 * Caller must hold RCU lock.
683 */
684static struct aggregator *__get_active_agg(struct aggregator *aggregator)
685{
686 struct bonding *bond = aggregator->slave->bond;
687 struct list_head *iter;
688 struct slave *slave;
689
690 bond_for_each_slave_rcu(bond, slave, iter)
691 if (SLAVE_AD_INFO(slave).aggregator.is_active)
692 return &(SLAVE_AD_INFO(slave).aggregator);
693
694 return NULL;
695}
696
697/**
698 * __update_lacpdu_from_port - update a port's lacpdu fields
699 * @port: the port we're looking at
700 */
701static inline void __update_lacpdu_from_port(struct port *port)
702{
703 struct lacpdu *lacpdu = &port->lacpdu;
704 const struct port_params *partner = &port->partner_oper;
705
706 /* update current actual Actor parameters
707 * lacpdu->subtype initialized
708 * lacpdu->version_number initialized
709 * lacpdu->tlv_type_actor_info initialized
710 * lacpdu->actor_information_length initialized
711 */
712
713 lacpdu->actor_system_priority = htons(port->actor_system_priority);
714 lacpdu->actor_system = port->actor_system;
715 lacpdu->actor_key = htons(port->actor_oper_port_key);
716 lacpdu->actor_port_priority = htons(port->actor_port_priority);
717 lacpdu->actor_port = htons(port->actor_port_number);
718 lacpdu->actor_state = port->actor_oper_port_state;
719
720 /* lacpdu->reserved_3_1 initialized
721 * lacpdu->tlv_type_partner_info initialized
722 * lacpdu->partner_information_length initialized
723 */
724
725 lacpdu->partner_system_priority = htons(partner->system_priority);
726 lacpdu->partner_system = partner->system;
727 lacpdu->partner_key = htons(partner->key);
728 lacpdu->partner_port_priority = htons(partner->port_priority);
729 lacpdu->partner_port = htons(partner->port_number);
730 lacpdu->partner_state = partner->port_state;
731
732 /* lacpdu->reserved_3_2 initialized
733 * lacpdu->tlv_type_collector_info initialized
734 * lacpdu->collector_information_length initialized
735 * collector_max_delay initialized
736 * reserved_12[12] initialized
737 * tlv_type_terminator initialized
738 * terminator_length initialized
739 * reserved_50[50] initialized
740 */
741}
742
743/* ================= main 802.3ad protocol code ========================= */
744
745/**
746 * ad_lacpdu_send - send out a lacpdu packet on a given port
747 * @port: the port we're looking at
748 *
749 * Returns: 0 on success
750 * < 0 on error
751 */
752static int ad_lacpdu_send(struct port *port)
753{
754 struct slave *slave = port->slave;
755 struct sk_buff *skb;
756 struct lacpdu_header *lacpdu_header;
757 int length = sizeof(struct lacpdu_header);
758
759 skb = dev_alloc_skb(length);
760 if (!skb)
761 return -ENOMEM;
762
763 skb->dev = slave->dev;
764 skb_reset_mac_header(skb);
765 skb->network_header = skb->mac_header + ETH_HLEN;
766 skb->protocol = PKT_TYPE_LACPDU;
767 skb->priority = TC_PRIO_CONTROL;
768
769 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
770
771 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
772 /* Note: source address is set to be the member's PERMANENT address,
773 * because we use it to identify loopback lacpdus in receive.
774 */
775 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
776 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
777
778 lacpdu_header->lacpdu = port->lacpdu;
779
780 dev_queue_xmit(skb);
781
782 return 0;
783}
784
785/**
786 * ad_marker_send - send marker information/response on a given port
787 * @port: the port we're looking at
788 * @marker: marker data to send
789 *
790 * Returns: 0 on success
791 * < 0 on error
792 */
793static int ad_marker_send(struct port *port, struct bond_marker *marker)
794{
795 struct slave *slave = port->slave;
796 struct sk_buff *skb;
797 struct bond_marker_header *marker_header;
798 int length = sizeof(struct bond_marker_header);
799
800 skb = dev_alloc_skb(length + 16);
801 if (!skb)
802 return -ENOMEM;
803
804 skb_reserve(skb, 16);
805
806 skb->dev = slave->dev;
807 skb_reset_mac_header(skb);
808 skb->network_header = skb->mac_header + ETH_HLEN;
809 skb->protocol = PKT_TYPE_LACPDU;
810
811 marker_header = (struct bond_marker_header *)skb_put(skb, length);
812
813 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
814 /* Note: source address is set to be the member's PERMANENT address,
815 * because we use it to identify loopback MARKERs in receive.
816 */
817 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
818 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
819
820 marker_header->marker = *marker;
821
822 dev_queue_xmit(skb);
823
824 return 0;
825}
826
827/**
828 * ad_mux_machine - handle a port's mux state machine
829 * @port: the port we're looking at
830 */
831static void ad_mux_machine(struct port *port)
832{
833 mux_states_t last_state;
834
835 /* keep current State Machine state to compare later if it was
836 * changed
837 */
838 last_state = port->sm_mux_state;
839
840 if (port->sm_vars & AD_PORT_BEGIN) {
841 port->sm_mux_state = AD_MUX_DETACHED;
842 } else {
843 switch (port->sm_mux_state) {
844 case AD_MUX_DETACHED:
845 if ((port->sm_vars & AD_PORT_SELECTED)
846 || (port->sm_vars & AD_PORT_STANDBY))
847 /* if SELECTED or STANDBY */
848 port->sm_mux_state = AD_MUX_WAITING;
849 break;
850 case AD_MUX_WAITING:
851 /* if SELECTED == FALSE return to DETACH state */
852 if (!(port->sm_vars & AD_PORT_SELECTED)) {
853 port->sm_vars &= ~AD_PORT_READY_N;
854 /* in order to withhold the Selection Logic to
855 * check all ports READY_N value every callback
856 * cycle to update ready variable, we check
857 * READY_N and update READY here
858 */
859 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
860 port->sm_mux_state = AD_MUX_DETACHED;
861 break;
862 }
863
864 /* check if the wait_while_timer expired */
865 if (port->sm_mux_timer_counter
866 && !(--port->sm_mux_timer_counter))
867 port->sm_vars |= AD_PORT_READY_N;
868
869 /* in order to withhold the selection logic to check
870 * all ports READY_N value every callback cycle to
871 * update ready variable, we check READY_N and update
872 * READY here
873 */
874 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
875
876 /* if the wait_while_timer expired, and the port is
877 * in READY state, move to ATTACHED state
878 */
879 if ((port->sm_vars & AD_PORT_READY)
880 && !port->sm_mux_timer_counter)
881 port->sm_mux_state = AD_MUX_ATTACHED;
882 break;
883 case AD_MUX_ATTACHED:
884 /* check also if agg_select_timer expired (so the
885 * edable port will take place only after this timer)
886 */
887 if ((port->sm_vars & AD_PORT_SELECTED) &&
888 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
889 !__check_agg_selection_timer(port)) {
890 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;
891 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
892 (port->sm_vars & AD_PORT_STANDBY)) {
893 /* if UNSELECTED or STANDBY */
894 port->sm_vars &= ~AD_PORT_READY_N;
895 /* in order to withhold the selection logic to
896 * check all ports READY_N value every callback
897 * cycle to update ready variable, we check
898 * READY_N and update READY here
899 */
900 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
901 port->sm_mux_state = AD_MUX_DETACHED;
902 }
903 break;
904 case AD_MUX_COLLECTING_DISTRIBUTING:
905 if (!(port->sm_vars & AD_PORT_SELECTED) ||
906 (port->sm_vars & AD_PORT_STANDBY) ||
907 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)) {
908 port->sm_mux_state = AD_MUX_ATTACHED;
909 } else {
910 /* if port state hasn't changed make
911 * sure that a collecting distributing
912 * port in an active aggregator is enabled
913 */
914 if (port->aggregator &&
915 port->aggregator->is_active &&
916 !__port_is_enabled(port)) {
917
918 __enable_port(port);
919 }
920 }
921 break;
922 default:
923 break;
924 }
925 }
926
927 /* check if the state machine was changed */
928 if (port->sm_mux_state != last_state) {
929 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
930 port->actor_port_number, last_state,
931 port->sm_mux_state);
932 switch (port->sm_mux_state) {
933 case AD_MUX_DETACHED:
934 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
935 ad_disable_collecting_distributing(port);
936 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
937 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
938 port->ntt = true;
939 break;
940 case AD_MUX_WAITING:
941 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
942 break;
943 case AD_MUX_ATTACHED:
944 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
945 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
946 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
947 ad_disable_collecting_distributing(port);
948 port->ntt = true;
949 break;
950 case AD_MUX_COLLECTING_DISTRIBUTING:
951 port->actor_oper_port_state |= AD_STATE_COLLECTING;
952 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
953 ad_enable_collecting_distributing(port);
954 port->ntt = true;
955 break;
956 default:
957 break;
958 }
959 }
960}
961
962/**
963 * ad_rx_machine - handle a port's rx State Machine
964 * @lacpdu: the lacpdu we've received
965 * @port: the port we're looking at
966 *
967 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
968 * CURRENT. If timer expired set the state machine in the proper state.
969 * In other cases, this function checks if we need to switch to other state.
970 */
971static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
972{
973 rx_states_t last_state;
974
975 /* keep current State Machine state to compare later if it was
976 * changed
977 */
978 last_state = port->sm_rx_state;
979
980 /* check if state machine should change state */
981
982 /* first, check if port was reinitialized */
983 if (port->sm_vars & AD_PORT_BEGIN)
984 port->sm_rx_state = AD_RX_INITIALIZE;
985 /* check if port is not enabled */
986 else if (!(port->sm_vars & AD_PORT_BEGIN)
987 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
988 port->sm_rx_state = AD_RX_PORT_DISABLED;
989 /* check if new lacpdu arrived */
990 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
991 (port->sm_rx_state == AD_RX_DEFAULTED) ||
992 (port->sm_rx_state == AD_RX_CURRENT))) {
993 port->sm_rx_timer_counter = 0;
994 port->sm_rx_state = AD_RX_CURRENT;
995 } else {
996 /* if timer is on, and if it is expired */
997 if (port->sm_rx_timer_counter &&
998 !(--port->sm_rx_timer_counter)) {
999 switch (port->sm_rx_state) {
1000 case AD_RX_EXPIRED:
1001 port->sm_rx_state = AD_RX_DEFAULTED;
1002 break;
1003 case AD_RX_CURRENT:
1004 port->sm_rx_state = AD_RX_EXPIRED;
1005 break;
1006 default:
1007 break;
1008 }
1009 } else {
1010 /* if no lacpdu arrived and no timer is on */
1011 switch (port->sm_rx_state) {
1012 case AD_RX_PORT_DISABLED:
1013 if (port->sm_vars & AD_PORT_MOVED)
1014 port->sm_rx_state = AD_RX_INITIALIZE;
1015 else if (port->is_enabled
1016 && (port->sm_vars
1017 & AD_PORT_LACP_ENABLED))
1018 port->sm_rx_state = AD_RX_EXPIRED;
1019 else if (port->is_enabled
1020 && ((port->sm_vars
1021 & AD_PORT_LACP_ENABLED) == 0))
1022 port->sm_rx_state = AD_RX_LACP_DISABLED;
1023 break;
1024 default:
1025 break;
1026
1027 }
1028 }
1029 }
1030
1031 /* check if the State machine was changed or new lacpdu arrived */
1032 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1033 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1034 port->actor_port_number, last_state,
1035 port->sm_rx_state);
1036 switch (port->sm_rx_state) {
1037 case AD_RX_INITIALIZE:
1038 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1039 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1040 else
1041 port->sm_vars |= AD_PORT_LACP_ENABLED;
1042 port->sm_vars &= ~AD_PORT_SELECTED;
1043 __record_default(port);
1044 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1045 port->sm_vars &= ~AD_PORT_MOVED;
1046 port->sm_rx_state = AD_RX_PORT_DISABLED;
1047
1048 /* Fall Through */
1049 case AD_RX_PORT_DISABLED:
1050 port->sm_vars &= ~AD_PORT_MATCHED;
1051 break;
1052 case AD_RX_LACP_DISABLED:
1053 port->sm_vars &= ~AD_PORT_SELECTED;
1054 __record_default(port);
1055 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1056 port->sm_vars |= AD_PORT_MATCHED;
1057 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1058 break;
1059 case AD_RX_EXPIRED:
1060 /* Reset of the Synchronization flag (Standard 43.4.12)
1061 * This reset cause to disable this port in the
1062 * COLLECTING_DISTRIBUTING state of the mux machine in
1063 * case of EXPIRED even if LINK_DOWN didn't arrive for
1064 * the port.
1065 */
1066 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1067 port->sm_vars &= ~AD_PORT_MATCHED;
1068 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1069 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1070 port->actor_oper_port_state |= AD_STATE_EXPIRED;
1071 break;
1072 case AD_RX_DEFAULTED:
1073 __update_default_selected(port);
1074 __record_default(port);
1075 port->sm_vars |= AD_PORT_MATCHED;
1076 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1077 break;
1078 case AD_RX_CURRENT:
1079 /* detect loopback situation */
1080 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1081 &(port->actor_system))) {
1082 pr_err("%s: An illegal loopback occurred on adapter (%s)\n"
1083 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1084 port->slave->bond->dev->name,
1085 port->slave->dev->name);
1086 return;
1087 }
1088 __update_selected(lacpdu, port);
1089 __update_ntt(lacpdu, port);
1090 __record_pdu(lacpdu, port);
1091 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1092 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1093 break;
1094 default:
1095 break;
1096 }
1097 }
1098}
1099
1100/**
1101 * ad_tx_machine - handle a port's tx state machine
1102 * @port: the port we're looking at
1103 */
1104static void ad_tx_machine(struct port *port)
1105{
1106 /* check if tx timer expired, to verify that we do not send more than
1107 * 3 packets per second
1108 */
1109 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1110 /* check if there is something to send */
1111 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1112 __update_lacpdu_from_port(port);
1113
1114 if (ad_lacpdu_send(port) >= 0) {
1115 pr_debug("Sent LACPDU on port %d\n",
1116 port->actor_port_number);
1117
1118 /* mark ntt as false, so it will not be sent
1119 * again until demanded
1120 */
1121 port->ntt = false;
1122 }
1123 }
1124 /* restart tx timer(to verify that we will not exceed
1125 * AD_MAX_TX_IN_SECOND
1126 */
1127 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1128 }
1129}
1130
1131/**
1132 * ad_periodic_machine - handle a port's periodic state machine
1133 * @port: the port we're looking at
1134 *
1135 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1136 */
1137static void ad_periodic_machine(struct port *port)
1138{
1139 periodic_states_t last_state;
1140
1141 /* keep current state machine state to compare later if it was changed */
1142 last_state = port->sm_periodic_state;
1143
1144 /* check if port was reinitialized */
1145 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1146 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1147 ) {
1148 port->sm_periodic_state = AD_NO_PERIODIC;
1149 }
1150 /* check if state machine should change state */
1151 else if (port->sm_periodic_timer_counter) {
1152 /* check if periodic state machine expired */
1153 if (!(--port->sm_periodic_timer_counter)) {
1154 /* if expired then do tx */
1155 port->sm_periodic_state = AD_PERIODIC_TX;
1156 } else {
1157 /* If not expired, check if there is some new timeout
1158 * parameter from the partner state
1159 */
1160 switch (port->sm_periodic_state) {
1161 case AD_FAST_PERIODIC:
1162 if (!(port->partner_oper.port_state
1163 & AD_STATE_LACP_TIMEOUT))
1164 port->sm_periodic_state = AD_SLOW_PERIODIC;
1165 break;
1166 case AD_SLOW_PERIODIC:
1167 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1168 port->sm_periodic_timer_counter = 0;
1169 port->sm_periodic_state = AD_PERIODIC_TX;
1170 }
1171 break;
1172 default:
1173 break;
1174 }
1175 }
1176 } else {
1177 switch (port->sm_periodic_state) {
1178 case AD_NO_PERIODIC:
1179 port->sm_periodic_state = AD_FAST_PERIODIC;
1180 break;
1181 case AD_PERIODIC_TX:
1182 if (!(port->partner_oper.port_state &
1183 AD_STATE_LACP_TIMEOUT))
1184 port->sm_periodic_state = AD_SLOW_PERIODIC;
1185 else
1186 port->sm_periodic_state = AD_FAST_PERIODIC;
1187 break;
1188 default:
1189 break;
1190 }
1191 }
1192
1193 /* check if the state machine was changed */
1194 if (port->sm_periodic_state != last_state) {
1195 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1196 port->actor_port_number, last_state,
1197 port->sm_periodic_state);
1198 switch (port->sm_periodic_state) {
1199 case AD_NO_PERIODIC:
1200 port->sm_periodic_timer_counter = 0;
1201 break;
1202 case AD_FAST_PERIODIC:
1203 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1204 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1205 break;
1206 case AD_SLOW_PERIODIC:
1207 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1208 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1209 break;
1210 case AD_PERIODIC_TX:
1211 port->ntt = true;
1212 break;
1213 default:
1214 break;
1215 }
1216 }
1217}
1218
1219/**
1220 * ad_port_selection_logic - select aggregation groups
1221 * @port: the port we're looking at
1222 *
1223 * Select aggregation groups, and assign each port for it's aggregetor. The
1224 * selection logic is called in the inititalization (after all the handshkes),
1225 * and after every lacpdu receive (if selected is off).
1226 */
1227static void ad_port_selection_logic(struct port *port)
1228{
1229 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1230 struct port *last_port = NULL, *curr_port;
1231 struct list_head *iter;
1232 struct bonding *bond;
1233 struct slave *slave;
1234 int found = 0;
1235
1236 /* if the port is already Selected, do nothing */
1237 if (port->sm_vars & AD_PORT_SELECTED)
1238 return;
1239
1240 bond = __get_bond_by_port(port);
1241
1242 /* if the port is connected to other aggregator, detach it */
1243 if (port->aggregator) {
1244 /* detach the port from its former aggregator */
1245 temp_aggregator = port->aggregator;
1246 for (curr_port = temp_aggregator->lag_ports; curr_port;
1247 last_port = curr_port,
1248 curr_port = curr_port->next_port_in_aggregator) {
1249 if (curr_port == port) {
1250 temp_aggregator->num_of_ports--;
1251 /* if it is the first port attached to the
1252 * aggregator
1253 */
1254 if (!last_port) {
1255 temp_aggregator->lag_ports =
1256 port->next_port_in_aggregator;
1257 } else {
1258 /* not the first port attached to the
1259 * aggregator
1260 */
1261 last_port->next_port_in_aggregator =
1262 port->next_port_in_aggregator;
1263 }
1264
1265 /* clear the port's relations to this
1266 * aggregator
1267 */
1268 port->aggregator = NULL;
1269 port->next_port_in_aggregator = NULL;
1270 port->actor_port_aggregator_identifier = 0;
1271
1272 pr_debug("Port %d left LAG %d\n",
1273 port->actor_port_number,
1274 temp_aggregator->aggregator_identifier);
1275 /* if the aggregator is empty, clear its
1276 * parameters, and set it ready to be attached
1277 */
1278 if (!temp_aggregator->lag_ports)
1279 ad_clear_agg(temp_aggregator);
1280 break;
1281 }
1282 }
1283 if (!curr_port) {
1284 /* meaning: the port was related to an aggregator
1285 * but was not on the aggregator port list
1286 */
1287 pr_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1288 port->slave->bond->dev->name,
1289 port->actor_port_number,
1290 port->slave->dev->name,
1291 port->aggregator->aggregator_identifier);
1292 }
1293 }
1294 /* search on all aggregators for a suitable aggregator for this port */
1295 bond_for_each_slave(bond, slave, iter) {
1296 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1297
1298 /* keep a free aggregator for later use(if needed) */
1299 if (!aggregator->lag_ports) {
1300 if (!free_aggregator)
1301 free_aggregator = aggregator;
1302 continue;
1303 }
1304 /* check if current aggregator suits us */
1305 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1306 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1307 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1308 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1309 ) &&
1310 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1311 !aggregator->is_individual) /* but is not individual OR */
1312 )
1313 ) {
1314 /* attach to the founded aggregator */
1315 port->aggregator = aggregator;
1316 port->actor_port_aggregator_identifier =
1317 port->aggregator->aggregator_identifier;
1318 port->next_port_in_aggregator = aggregator->lag_ports;
1319 port->aggregator->num_of_ports++;
1320 aggregator->lag_ports = port;
1321 pr_debug("Port %d joined LAG %d(existing LAG)\n",
1322 port->actor_port_number,
1323 port->aggregator->aggregator_identifier);
1324
1325 /* mark this port as selected */
1326 port->sm_vars |= AD_PORT_SELECTED;
1327 found = 1;
1328 break;
1329 }
1330 }
1331
1332 /* the port couldn't find an aggregator - attach it to a new
1333 * aggregator
1334 */
1335 if (!found) {
1336 if (free_aggregator) {
1337 /* assign port a new aggregator */
1338 port->aggregator = free_aggregator;
1339 port->actor_port_aggregator_identifier =
1340 port->aggregator->aggregator_identifier;
1341
1342 /* update the new aggregator's parameters
1343 * if port was responsed from the end-user
1344 */
1345 if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1346 /* if port is full duplex */
1347 port->aggregator->is_individual = false;
1348 else
1349 port->aggregator->is_individual = true;
1350
1351 port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1352 port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1353 port->aggregator->partner_system =
1354 port->partner_oper.system;
1355 port->aggregator->partner_system_priority =
1356 port->partner_oper.system_priority;
1357 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1358 port->aggregator->receive_state = 1;
1359 port->aggregator->transmit_state = 1;
1360 port->aggregator->lag_ports = port;
1361 port->aggregator->num_of_ports++;
1362
1363 /* mark this port as selected */
1364 port->sm_vars |= AD_PORT_SELECTED;
1365
1366 pr_debug("Port %d joined LAG %d(new LAG)\n",
1367 port->actor_port_number,
1368 port->aggregator->aggregator_identifier);
1369 } else {
1370 pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1371 port->slave->bond->dev->name,
1372 port->actor_port_number, port->slave->dev->name);
1373 }
1374 }
1375 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1376 * in all aggregator's ports, else set ready=FALSE in all
1377 * aggregator's ports
1378 */
1379 __set_agg_ports_ready(port->aggregator,
1380 __agg_ports_are_ready(port->aggregator));
1381
1382 aggregator = __get_first_agg(port);
1383 ad_agg_selection_logic(aggregator);
1384}
1385
1386/* Decide if "agg" is a better choice for the new active aggregator that
1387 * the current best, according to the ad_select policy.
1388 */
1389static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1390 struct aggregator *curr)
1391{
1392 /* 0. If no best, select current.
1393 *
1394 * 1. If the current agg is not individual, and the best is
1395 * individual, select current.
1396 *
1397 * 2. If current agg is individual and the best is not, keep best.
1398 *
1399 * 3. Therefore, current and best are both individual or both not
1400 * individual, so:
1401 *
1402 * 3a. If current agg partner replied, and best agg partner did not,
1403 * select current.
1404 *
1405 * 3b. If current agg partner did not reply and best agg partner
1406 * did reply, keep best.
1407 *
1408 * 4. Therefore, current and best both have partner replies or
1409 * both do not, so perform selection policy:
1410 *
1411 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1412 * select by bandwidth.
1413 *
1414 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1415 */
1416 if (!best)
1417 return curr;
1418
1419 if (!curr->is_individual && best->is_individual)
1420 return curr;
1421
1422 if (curr->is_individual && !best->is_individual)
1423 return best;
1424
1425 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1426 return curr;
1427
1428 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1429 return best;
1430
1431 switch (__get_agg_selection_mode(curr->lag_ports)) {
1432 case BOND_AD_COUNT:
1433 if (curr->num_of_ports > best->num_of_ports)
1434 return curr;
1435
1436 if (curr->num_of_ports < best->num_of_ports)
1437 return best;
1438
1439 /*FALLTHROUGH*/
1440 case BOND_AD_STABLE:
1441 case BOND_AD_BANDWIDTH:
1442 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1443 return curr;
1444
1445 break;
1446
1447 default:
1448 pr_warn_ratelimited("%s: Impossible agg select mode %d\n",
1449 curr->slave->bond->dev->name,
1450 __get_agg_selection_mode(curr->lag_ports));
1451 break;
1452 }
1453
1454 return best;
1455}
1456
1457static int agg_device_up(const struct aggregator *agg)
1458{
1459 struct port *port = agg->lag_ports;
1460
1461 if (!port)
1462 return 0;
1463
1464 return netif_running(port->slave->dev) &&
1465 netif_carrier_ok(port->slave->dev);
1466}
1467
1468/**
1469 * ad_agg_selection_logic - select an aggregation group for a team
1470 * @aggregator: the aggregator we're looking at
1471 *
1472 * It is assumed that only one aggregator may be selected for a team.
1473 *
1474 * The logic of this function is to select the aggregator according to
1475 * the ad_select policy:
1476 *
1477 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1478 * it, and to reselect the active aggregator only if the previous
1479 * aggregator has no more ports related to it.
1480 *
1481 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1482 * bandwidth, and reselect whenever a link state change takes place or the
1483 * set of slaves in the bond changes.
1484 *
1485 * BOND_AD_COUNT: select the aggregator with largest number of ports
1486 * (slaves), and reselect whenever a link state change takes place or the
1487 * set of slaves in the bond changes.
1488 *
1489 * FIXME: this function MUST be called with the first agg in the bond, or
1490 * __get_active_agg() won't work correctly. This function should be better
1491 * called with the bond itself, and retrieve the first agg from it.
1492 */
1493static void ad_agg_selection_logic(struct aggregator *agg)
1494{
1495 struct aggregator *best, *active, *origin;
1496 struct bonding *bond = agg->slave->bond;
1497 struct list_head *iter;
1498 struct slave *slave;
1499 struct port *port;
1500
1501 rcu_read_lock();
1502 origin = agg;
1503 active = __get_active_agg(agg);
1504 best = (active && agg_device_up(active)) ? active : NULL;
1505
1506 bond_for_each_slave_rcu(bond, slave, iter) {
1507 agg = &(SLAVE_AD_INFO(slave).aggregator);
1508
1509 agg->is_active = 0;
1510
1511 if (agg->num_of_ports && agg_device_up(agg))
1512 best = ad_agg_selection_test(best, agg);
1513 }
1514
1515 if (best &&
1516 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1517 /* For the STABLE policy, don't replace the old active
1518 * aggregator if it's still active (it has an answering
1519 * partner) or if both the best and active don't have an
1520 * answering partner.
1521 */
1522 if (active && active->lag_ports &&
1523 active->lag_ports->is_enabled &&
1524 (__agg_has_partner(active) ||
1525 (!__agg_has_partner(active) &&
1526 !__agg_has_partner(best)))) {
1527 if (!(!active->actor_oper_aggregator_key &&
1528 best->actor_oper_aggregator_key)) {
1529 best = NULL;
1530 active->is_active = 1;
1531 }
1532 }
1533 }
1534
1535 if (best && (best == active)) {
1536 best = NULL;
1537 active->is_active = 1;
1538 }
1539
1540 /* if there is new best aggregator, activate it */
1541 if (best) {
1542 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1543 best->aggregator_identifier, best->num_of_ports,
1544 best->actor_oper_aggregator_key,
1545 best->partner_oper_aggregator_key,
1546 best->is_individual, best->is_active);
1547 pr_debug("best ports %p slave %p %s\n",
1548 best->lag_ports, best->slave,
1549 best->slave ? best->slave->dev->name : "NULL");
1550
1551 bond_for_each_slave_rcu(bond, slave, iter) {
1552 agg = &(SLAVE_AD_INFO(slave).aggregator);
1553
1554 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1555 agg->aggregator_identifier, agg->num_of_ports,
1556 agg->actor_oper_aggregator_key,
1557 agg->partner_oper_aggregator_key,
1558 agg->is_individual, agg->is_active);
1559 }
1560
1561 /* check if any partner replys */
1562 if (best->is_individual) {
1563 pr_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1564 best->slave ?
1565 best->slave->bond->dev->name : "NULL");
1566 }
1567
1568 best->is_active = 1;
1569 pr_debug("LAG %d chosen as the active LAG\n",
1570 best->aggregator_identifier);
1571 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1572 best->aggregator_identifier, best->num_of_ports,
1573 best->actor_oper_aggregator_key,
1574 best->partner_oper_aggregator_key,
1575 best->is_individual, best->is_active);
1576
1577 /* disable the ports that were related to the former
1578 * active_aggregator
1579 */
1580 if (active) {
1581 for (port = active->lag_ports; port;
1582 port = port->next_port_in_aggregator) {
1583 __disable_port(port);
1584 }
1585 }
1586 }
1587
1588 /* if the selected aggregator is of join individuals
1589 * (partner_system is NULL), enable their ports
1590 */
1591 active = __get_active_agg(origin);
1592
1593 if (active) {
1594 if (!__agg_has_partner(active)) {
1595 for (port = active->lag_ports; port;
1596 port = port->next_port_in_aggregator) {
1597 __enable_port(port);
1598 }
1599 }
1600 }
1601
1602 rcu_read_unlock();
1603
1604 bond_3ad_set_carrier(bond);
1605}
1606
1607/**
1608 * ad_clear_agg - clear a given aggregator's parameters
1609 * @aggregator: the aggregator we're looking at
1610 */
1611static void ad_clear_agg(struct aggregator *aggregator)
1612{
1613 if (aggregator) {
1614 aggregator->is_individual = false;
1615 aggregator->actor_admin_aggregator_key = 0;
1616 aggregator->actor_oper_aggregator_key = 0;
1617 aggregator->partner_system = null_mac_addr;
1618 aggregator->partner_system_priority = 0;
1619 aggregator->partner_oper_aggregator_key = 0;
1620 aggregator->receive_state = 0;
1621 aggregator->transmit_state = 0;
1622 aggregator->lag_ports = NULL;
1623 aggregator->is_active = 0;
1624 aggregator->num_of_ports = 0;
1625 pr_debug("LAG %d was cleared\n",
1626 aggregator->aggregator_identifier);
1627 }
1628}
1629
1630/**
1631 * ad_initialize_agg - initialize a given aggregator's parameters
1632 * @aggregator: the aggregator we're looking at
1633 */
1634static void ad_initialize_agg(struct aggregator *aggregator)
1635{
1636 if (aggregator) {
1637 ad_clear_agg(aggregator);
1638
1639 aggregator->aggregator_mac_address = null_mac_addr;
1640 aggregator->aggregator_identifier = 0;
1641 aggregator->slave = NULL;
1642 }
1643}
1644
1645/**
1646 * ad_initialize_port - initialize a given port's parameters
1647 * @aggregator: the aggregator we're looking at
1648 * @lacp_fast: boolean. whether fast periodic should be used
1649 */
1650static void ad_initialize_port(struct port *port, int lacp_fast)
1651{
1652 static const struct port_params tmpl = {
1653 .system_priority = 0xffff,
1654 .key = 1,
1655 .port_number = 1,
1656 .port_priority = 0xff,
1657 .port_state = 1,
1658 };
1659 static const struct lacpdu lacpdu = {
1660 .subtype = 0x01,
1661 .version_number = 0x01,
1662 .tlv_type_actor_info = 0x01,
1663 .actor_information_length = 0x14,
1664 .tlv_type_partner_info = 0x02,
1665 .partner_information_length = 0x14,
1666 .tlv_type_collector_info = 0x03,
1667 .collector_information_length = 0x10,
1668 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1669 };
1670
1671 if (port) {
1672 port->actor_port_number = 1;
1673 port->actor_port_priority = 0xff;
1674 port->actor_system = null_mac_addr;
1675 port->actor_system_priority = 0xffff;
1676 port->actor_port_aggregator_identifier = 0;
1677 port->ntt = false;
1678 port->actor_admin_port_key = 1;
1679 port->actor_oper_port_key = 1;
1680 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1681 AD_STATE_LACP_ACTIVITY;
1682 port->actor_oper_port_state = AD_STATE_AGGREGATION |
1683 AD_STATE_LACP_ACTIVITY;
1684
1685 if (lacp_fast)
1686 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1687
1688 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1689 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1690
1691 port->is_enabled = true;
1692 /* private parameters */
1693 port->sm_vars = 0x3;
1694 port->sm_rx_state = 0;
1695 port->sm_rx_timer_counter = 0;
1696 port->sm_periodic_state = 0;
1697 port->sm_periodic_timer_counter = 0;
1698 port->sm_mux_state = 0;
1699 port->sm_mux_timer_counter = 0;
1700 port->sm_tx_state = 0;
1701 port->sm_tx_timer_counter = 0;
1702 port->slave = NULL;
1703 port->aggregator = NULL;
1704 port->next_port_in_aggregator = NULL;
1705 port->transaction_id = 0;
1706
1707 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1708 }
1709}
1710
1711/**
1712 * ad_enable_collecting_distributing - enable a port's transmit/receive
1713 * @port: the port we're looking at
1714 *
1715 * Enable @port if it's in an active aggregator
1716 */
1717static void ad_enable_collecting_distributing(struct port *port)
1718{
1719 if (port->aggregator->is_active) {
1720 pr_debug("Enabling port %d(LAG %d)\n",
1721 port->actor_port_number,
1722 port->aggregator->aggregator_identifier);
1723 __enable_port(port);
1724 }
1725}
1726
1727/**
1728 * ad_disable_collecting_distributing - disable a port's transmit/receive
1729 * @port: the port we're looking at
1730 */
1731static void ad_disable_collecting_distributing(struct port *port)
1732{
1733 if (port->aggregator &&
1734 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1735 &(null_mac_addr))) {
1736 pr_debug("Disabling port %d(LAG %d)\n",
1737 port->actor_port_number,
1738 port->aggregator->aggregator_identifier);
1739 __disable_port(port);
1740 }
1741}
1742
1743/**
1744 * ad_marker_info_received - handle receive of a Marker information frame
1745 * @marker_info: Marker info received
1746 * @port: the port we're looking at
1747 */
1748static void ad_marker_info_received(struct bond_marker *marker_info,
1749 struct port *port)
1750{
1751 struct bond_marker marker;
1752
1753 /* copy the received marker data to the response marker */
1754 memcpy(&marker, marker_info, sizeof(struct bond_marker));
1755 /* change the marker subtype to marker response */
1756 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1757
1758 /* send the marker response */
1759 if (ad_marker_send(port, &marker) >= 0) {
1760 pr_debug("Sent Marker Response on port %d\n",
1761 port->actor_port_number);
1762 }
1763}
1764
1765/**
1766 * ad_marker_response_received - handle receive of a marker response frame
1767 * @marker: marker PDU received
1768 * @port: the port we're looking at
1769 *
1770 * This function does nothing since we decided not to implement send and handle
1771 * response for marker PDU's, in this stage, but only to respond to marker
1772 * information.
1773 */
1774static void ad_marker_response_received(struct bond_marker *marker,
1775 struct port *port)
1776{
1777 marker = NULL;
1778 port = NULL;
1779 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1780}
1781
1782/* ========= AD exported functions to the main bonding code ========= */
1783
1784/* Check aggregators status in team every T seconds */
1785#define AD_AGGREGATOR_SELECTION_TIMER 8
1786
1787/**
1788 * bond_3ad_initiate_agg_selection - initate aggregator selection
1789 * @bond: bonding struct
1790 *
1791 * Set the aggregation selection timer, to initiate an agg selection in
1792 * the very near future. Called during first initialization, and during
1793 * any down to up transitions of the bond.
1794 */
1795void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1796{
1797 BOND_AD_INFO(bond).agg_select_timer = timeout;
1798}
1799
1800/**
1801 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1802 * @bond: bonding struct to work on
1803 * @tick_resolution: tick duration (millisecond resolution)
1804 *
1805 * Can be called only after the mac address of the bond is set.
1806 */
1807void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1808{
1809 /* check that the bond is not initialized yet */
1810 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1811 bond->dev->dev_addr)) {
1812
1813 BOND_AD_INFO(bond).aggregator_identifier = 0;
1814
1815 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1816 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1817
1818 /* initialize how many times this module is called in one
1819 * second (should be about every 100ms)
1820 */
1821 ad_ticks_per_sec = tick_resolution;
1822
1823 bond_3ad_initiate_agg_selection(bond,
1824 AD_AGGREGATOR_SELECTION_TIMER *
1825 ad_ticks_per_sec);
1826 }
1827}
1828
1829/**
1830 * bond_3ad_bind_slave - initialize a slave's port
1831 * @slave: slave struct to work on
1832 *
1833 * Returns: 0 on success
1834 * < 0 on error
1835 */
1836void bond_3ad_bind_slave(struct slave *slave)
1837{
1838 struct bonding *bond = bond_get_bond_by_slave(slave);
1839 struct port *port;
1840 struct aggregator *aggregator;
1841
1842 /* check that the slave has not been initialized yet. */
1843 if (SLAVE_AD_INFO(slave).port.slave != slave) {
1844
1845 /* port initialization */
1846 port = &(SLAVE_AD_INFO(slave).port);
1847
1848 ad_initialize_port(port, bond->params.lacp_fast);
1849
1850 __initialize_port_locks(slave);
1851 port->slave = slave;
1852 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1853 /* key is determined according to the link speed, duplex and user key(which
1854 * is yet not supported)
1855 */
1856 port->actor_admin_port_key = 0;
1857 port->actor_admin_port_key |= __get_duplex(port);
1858 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1859 port->actor_oper_port_key = port->actor_admin_port_key;
1860 /* if the port is not full duplex, then the port should be not
1861 * lacp Enabled
1862 */
1863 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1864 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1865 /* actor system is the bond's system */
1866 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1867 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1868 * lacpdu's are sent in one second)
1869 */
1870 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1871 port->aggregator = NULL;
1872 port->next_port_in_aggregator = NULL;
1873
1874 __disable_port(port);
1875
1876 /* aggregator initialization */
1877 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1878
1879 ad_initialize_agg(aggregator);
1880
1881 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1882 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1883 aggregator->slave = slave;
1884 aggregator->is_active = 0;
1885 aggregator->num_of_ports = 0;
1886 }
1887}
1888
1889/**
1890 * bond_3ad_unbind_slave - deinitialize a slave's port
1891 * @slave: slave struct to work on
1892 *
1893 * Search for the aggregator that is related to this port, remove the
1894 * aggregator and assign another aggregator for other port related to it
1895 * (if any), and remove the port.
1896 */
1897void bond_3ad_unbind_slave(struct slave *slave)
1898{
1899 struct port *port, *prev_port, *temp_port;
1900 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1901 int select_new_active_agg = 0;
1902 struct bonding *bond = slave->bond;
1903 struct slave *slave_iter;
1904 struct list_head *iter;
1905
1906 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1907 port = &(SLAVE_AD_INFO(slave).port);
1908
1909 /* if slave is null, the whole port is not initialized */
1910 if (!port->slave) {
1911 pr_warn("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1912 slave->bond->dev->name, slave->dev->name);
1913 return;
1914 }
1915
1916 pr_debug("Unbinding Link Aggregation Group %d\n",
1917 aggregator->aggregator_identifier);
1918
1919 /* Tell the partner that this port is not suitable for aggregation */
1920 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1921 __update_lacpdu_from_port(port);
1922 ad_lacpdu_send(port);
1923
1924 /* check if this aggregator is occupied */
1925 if (aggregator->lag_ports) {
1926 /* check if there are other ports related to this aggregator
1927 * except the port related to this slave(thats ensure us that
1928 * there is a reason to search for new aggregator, and that we
1929 * will find one
1930 */
1931 if ((aggregator->lag_ports != port) ||
1932 (aggregator->lag_ports->next_port_in_aggregator)) {
1933 /* find new aggregator for the related port(s) */
1934 bond_for_each_slave(bond, slave_iter, iter) {
1935 new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
1936 /* if the new aggregator is empty, or it is
1937 * connected to our port only
1938 */
1939 if (!new_aggregator->lag_ports ||
1940 ((new_aggregator->lag_ports == port) &&
1941 !new_aggregator->lag_ports->next_port_in_aggregator))
1942 break;
1943 }
1944 if (!slave_iter)
1945 new_aggregator = NULL;
1946
1947 /* if new aggregator found, copy the aggregator's
1948 * parameters and connect the related lag_ports to the
1949 * new aggregator
1950 */
1951 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1952 pr_debug("Some port(s) related to LAG %d - replacing with LAG %d\n",
1953 aggregator->aggregator_identifier,
1954 new_aggregator->aggregator_identifier);
1955
1956 if ((new_aggregator->lag_ports == port) &&
1957 new_aggregator->is_active) {
1958 pr_info("%s: Removing an active aggregator\n",
1959 aggregator->slave->bond->dev->name);
1960 select_new_active_agg = 1;
1961 }
1962
1963 new_aggregator->is_individual = aggregator->is_individual;
1964 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1965 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1966 new_aggregator->partner_system = aggregator->partner_system;
1967 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1968 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1969 new_aggregator->receive_state = aggregator->receive_state;
1970 new_aggregator->transmit_state = aggregator->transmit_state;
1971 new_aggregator->lag_ports = aggregator->lag_ports;
1972 new_aggregator->is_active = aggregator->is_active;
1973 new_aggregator->num_of_ports = aggregator->num_of_ports;
1974
1975 /* update the information that is written on
1976 * the ports about the aggregator
1977 */
1978 for (temp_port = aggregator->lag_ports; temp_port;
1979 temp_port = temp_port->next_port_in_aggregator) {
1980 temp_port->aggregator = new_aggregator;
1981 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1982 }
1983
1984 ad_clear_agg(aggregator);
1985
1986 if (select_new_active_agg)
1987 ad_agg_selection_logic(__get_first_agg(port));
1988 } else {
1989 pr_warn("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
1990 slave->bond->dev->name);
1991 }
1992 } else {
1993 /* in case that the only port related to this
1994 * aggregator is the one we want to remove
1995 */
1996 select_new_active_agg = aggregator->is_active;
1997 ad_clear_agg(aggregator);
1998 if (select_new_active_agg) {
1999 pr_info("%s: Removing an active aggregator\n",
2000 slave->bond->dev->name);
2001 /* select new active aggregator */
2002 temp_aggregator = __get_first_agg(port);
2003 if (temp_aggregator)
2004 ad_agg_selection_logic(temp_aggregator);
2005 }
2006 }
2007 }
2008
2009 pr_debug("Unbinding port %d\n", port->actor_port_number);
2010
2011 /* find the aggregator that this port is connected to */
2012 bond_for_each_slave(bond, slave_iter, iter) {
2013 temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
2014 prev_port = NULL;
2015 /* search the port in the aggregator's related ports */
2016 for (temp_port = temp_aggregator->lag_ports; temp_port;
2017 prev_port = temp_port,
2018 temp_port = temp_port->next_port_in_aggregator) {
2019 if (temp_port == port) {
2020 /* the aggregator found - detach the port from
2021 * this aggregator
2022 */
2023 if (prev_port)
2024 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2025 else
2026 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2027 temp_aggregator->num_of_ports--;
2028 if (temp_aggregator->num_of_ports == 0) {
2029 select_new_active_agg = temp_aggregator->is_active;
2030 ad_clear_agg(temp_aggregator);
2031 if (select_new_active_agg) {
2032 pr_info("%s: Removing an active aggregator\n",
2033 slave->bond->dev->name);
2034 /* select new active aggregator */
2035 ad_agg_selection_logic(__get_first_agg(port));
2036 }
2037 }
2038 break;
2039 }
2040 }
2041 }
2042 port->slave = NULL;
2043}
2044
2045/**
2046 * bond_3ad_state_machine_handler - handle state machines timeout
2047 * @bond: bonding struct to work on
2048 *
2049 * The state machine handling concept in this module is to check every tick
2050 * which state machine should operate any function. The execution order is
2051 * round robin, so when we have an interaction between state machines, the
2052 * reply of one to each other might be delayed until next tick.
2053 *
2054 * This function also complete the initialization when the agg_select_timer
2055 * times out, and it selects an aggregator for the ports that are yet not
2056 * related to any aggregator, and selects the active aggregator for a bond.
2057 */
2058void bond_3ad_state_machine_handler(struct work_struct *work)
2059{
2060 struct bonding *bond = container_of(work, struct bonding,
2061 ad_work.work);
2062 struct aggregator *aggregator;
2063 struct list_head *iter;
2064 struct slave *slave;
2065 struct port *port;
2066 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2067
2068 read_lock(&bond->lock);
2069 rcu_read_lock();
2070
2071 /* check if there are any slaves */
2072 if (!bond_has_slaves(bond))
2073 goto re_arm;
2074
2075 /* check if agg_select_timer timer after initialize is timed out */
2076 if (BOND_AD_INFO(bond).agg_select_timer &&
2077 !(--BOND_AD_INFO(bond).agg_select_timer)) {
2078 slave = bond_first_slave_rcu(bond);
2079 port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
2080
2081 /* select the active aggregator for the bond */
2082 if (port) {
2083 if (!port->slave) {
2084 pr_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2085 bond->dev->name);
2086 goto re_arm;
2087 }
2088
2089 aggregator = __get_first_agg(port);
2090 ad_agg_selection_logic(aggregator);
2091 }
2092 bond_3ad_set_carrier(bond);
2093 }
2094
2095 /* for each port run the state machines */
2096 bond_for_each_slave_rcu(bond, slave, iter) {
2097 port = &(SLAVE_AD_INFO(slave).port);
2098 if (!port->slave) {
2099 pr_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2100 bond->dev->name);
2101 goto re_arm;
2102 }
2103
2104 /* Lock around state machines to protect data accessed
2105 * by all (e.g., port->sm_vars). ad_rx_machine may run
2106 * concurrently due to incoming LACPDU.
2107 */
2108 __get_state_machine_lock(port);
2109
2110 ad_rx_machine(NULL, port);
2111 ad_periodic_machine(port);
2112 ad_port_selection_logic(port);
2113 ad_mux_machine(port);
2114 ad_tx_machine(port);
2115
2116 /* turn off the BEGIN bit, since we already handled it */
2117 if (port->sm_vars & AD_PORT_BEGIN)
2118 port->sm_vars &= ~AD_PORT_BEGIN;
2119
2120 __release_state_machine_lock(port);
2121 }
2122
2123re_arm:
2124 bond_for_each_slave_rcu(bond, slave, iter) {
2125 if (slave->should_notify) {
2126 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2127 break;
2128 }
2129 }
2130 rcu_read_unlock();
2131 read_unlock(&bond->lock);
2132
2133 if (should_notify_rtnl && rtnl_trylock()) {
2134 bond_slave_state_notify(bond);
2135 rtnl_unlock();
2136 }
2137 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2138}
2139
2140/**
2141 * bond_3ad_rx_indication - handle a received frame
2142 * @lacpdu: received lacpdu
2143 * @slave: slave struct to work on
2144 * @length: length of the data received
2145 *
2146 * It is assumed that frames that were sent on this NIC don't returned as new
2147 * received frames (loopback). Since only the payload is given to this
2148 * function, it check for loopback.
2149 */
2150static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2151 u16 length)
2152{
2153 struct port *port;
2154 int ret = RX_HANDLER_ANOTHER;
2155
2156 if (length >= sizeof(struct lacpdu)) {
2157
2158 port = &(SLAVE_AD_INFO(slave).port);
2159
2160 if (!port->slave) {
2161 pr_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2162 slave->dev->name, slave->bond->dev->name);
2163 return ret;
2164 }
2165
2166 switch (lacpdu->subtype) {
2167 case AD_TYPE_LACPDU:
2168 ret = RX_HANDLER_CONSUMED;
2169 pr_debug("Received LACPDU on port %d\n",
2170 port->actor_port_number);
2171 /* Protect against concurrent state machines */
2172 __get_state_machine_lock(port);
2173 ad_rx_machine(lacpdu, port);
2174 __release_state_machine_lock(port);
2175 break;
2176
2177 case AD_TYPE_MARKER:
2178 ret = RX_HANDLER_CONSUMED;
2179 /* No need to convert fields to Little Endian since we
2180 * don't use the marker's fields.
2181 */
2182
2183 switch (((struct bond_marker *)lacpdu)->tlv_type) {
2184 case AD_MARKER_INFORMATION_SUBTYPE:
2185 pr_debug("Received Marker Information on port %d\n",
2186 port->actor_port_number);
2187 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2188 break;
2189
2190 case AD_MARKER_RESPONSE_SUBTYPE:
2191 pr_debug("Received Marker Response on port %d\n",
2192 port->actor_port_number);
2193 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2194 break;
2195
2196 default:
2197 pr_debug("Received an unknown Marker subtype on slot %d\n",
2198 port->actor_port_number);
2199 }
2200 }
2201 }
2202 return ret;
2203}
2204
2205/**
2206 * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2207 * @slave: slave struct to work on
2208 *
2209 * Handle reselection of aggregator (if needed) for this port.
2210 */
2211void bond_3ad_adapter_speed_changed(struct slave *slave)
2212{
2213 struct port *port;
2214
2215 port = &(SLAVE_AD_INFO(slave).port);
2216
2217 /* if slave is null, the whole port is not initialized */
2218 if (!port->slave) {
2219 pr_warn("Warning: %s: speed changed for uninitialized port on %s\n",
2220 slave->bond->dev->name, slave->dev->name);
2221 return;
2222 }
2223
2224 __get_state_machine_lock(port);
2225
2226 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2227 port->actor_oper_port_key = port->actor_admin_port_key |=
2228 (__get_link_speed(port) << 1);
2229 pr_debug("Port %d changed speed\n", port->actor_port_number);
2230 /* there is no need to reselect a new aggregator, just signal the
2231 * state machines to reinitialize
2232 */
2233 port->sm_vars |= AD_PORT_BEGIN;
2234
2235 __release_state_machine_lock(port);
2236}
2237
2238/**
2239 * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2240 * @slave: slave struct to work on
2241 *
2242 * Handle reselection of aggregator (if needed) for this port.
2243 */
2244void bond_3ad_adapter_duplex_changed(struct slave *slave)
2245{
2246 struct port *port;
2247
2248 port = &(SLAVE_AD_INFO(slave).port);
2249
2250 /* if slave is null, the whole port is not initialized */
2251 if (!port->slave) {
2252 pr_warn("%s: Warning: duplex changed for uninitialized port on %s\n",
2253 slave->bond->dev->name, slave->dev->name);
2254 return;
2255 }
2256
2257 __get_state_machine_lock(port);
2258
2259 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2260 port->actor_oper_port_key = port->actor_admin_port_key |=
2261 __get_duplex(port);
2262 pr_debug("Port %d changed duplex\n", port->actor_port_number);
2263 /* there is no need to reselect a new aggregator, just signal the
2264 * state machines to reinitialize
2265 */
2266 port->sm_vars |= AD_PORT_BEGIN;
2267
2268 __release_state_machine_lock(port);
2269}
2270
2271/**
2272 * bond_3ad_handle_link_change - handle a slave's link status change indication
2273 * @slave: slave struct to work on
2274 * @status: whether the link is now up or down
2275 *
2276 * Handle reselection of aggregator (if needed) for this port.
2277 */
2278void bond_3ad_handle_link_change(struct slave *slave, char link)
2279{
2280 struct port *port;
2281
2282 port = &(SLAVE_AD_INFO(slave).port);
2283
2284 /* if slave is null, the whole port is not initialized */
2285 if (!port->slave) {
2286 pr_warn("Warning: %s: link status changed for uninitialized port on %s\n",
2287 slave->bond->dev->name, slave->dev->name);
2288 return;
2289 }
2290
2291 __get_state_machine_lock(port);
2292 /* on link down we are zeroing duplex and speed since
2293 * some of the adaptors(ce1000.lan) report full duplex/speed
2294 * instead of N/A(duplex) / 0(speed).
2295 *
2296 * on link up we are forcing recheck on the duplex and speed since
2297 * some of he adaptors(ce1000.lan) report.
2298 */
2299 if (link == BOND_LINK_UP) {
2300 port->is_enabled = true;
2301 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2302 port->actor_oper_port_key = port->actor_admin_port_key |=
2303 __get_duplex(port);
2304 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2305 port->actor_oper_port_key = port->actor_admin_port_key |=
2306 (__get_link_speed(port) << 1);
2307 } else {
2308 /* link has failed */
2309 port->is_enabled = false;
2310 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2311 port->actor_oper_port_key = (port->actor_admin_port_key &=
2312 ~AD_SPEED_KEY_BITS);
2313 }
2314 pr_debug("Port %d changed link status to %s\n",
2315 port->actor_port_number,
2316 link == BOND_LINK_UP ? "UP" : "DOWN");
2317 /* there is no need to reselect a new aggregator, just signal the
2318 * state machines to reinitialize
2319 */
2320 port->sm_vars |= AD_PORT_BEGIN;
2321
2322 __release_state_machine_lock(port);
2323}
2324
2325/**
2326 * bond_3ad_set_carrier - set link state for bonding master
2327 * @bond - bonding structure
2328 *
2329 * if we have an active aggregator, we're up, if not, we're down.
2330 * Presumes that we cannot have an active aggregator if there are
2331 * no slaves with link up.
2332 *
2333 * This behavior complies with IEEE 802.3 section 43.3.9.
2334 *
2335 * Called by bond_set_carrier(). Return zero if carrier state does not
2336 * change, nonzero if it does.
2337 */
2338int bond_3ad_set_carrier(struct bonding *bond)
2339{
2340 struct aggregator *active;
2341 struct slave *first_slave;
2342 int ret = 1;
2343
2344 rcu_read_lock();
2345 first_slave = bond_first_slave_rcu(bond);
2346 if (!first_slave) {
2347 ret = 0;
2348 goto out;
2349 }
2350 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
2351 if (active) {
2352 /* are enough slaves available to consider link up? */
2353 if (active->num_of_ports < bond->params.min_links) {
2354 if (netif_carrier_ok(bond->dev)) {
2355 netif_carrier_off(bond->dev);
2356 goto out;
2357 }
2358 } else if (!netif_carrier_ok(bond->dev)) {
2359 netif_carrier_on(bond->dev);
2360 goto out;
2361 }
2362 } else if (netif_carrier_ok(bond->dev)) {
2363 netif_carrier_off(bond->dev);
2364 }
2365out:
2366 rcu_read_unlock();
2367 return ret;
2368}
2369
2370/**
2371 * __bond_3ad_get_active_agg_info - get information of the active aggregator
2372 * @bond: bonding struct to work on
2373 * @ad_info: ad_info struct to fill with the bond's info
2374 *
2375 * Returns: 0 on success
2376 * < 0 on error
2377 */
2378int __bond_3ad_get_active_agg_info(struct bonding *bond,
2379 struct ad_info *ad_info)
2380{
2381 struct aggregator *aggregator = NULL;
2382 struct list_head *iter;
2383 struct slave *slave;
2384 struct port *port;
2385
2386 bond_for_each_slave_rcu(bond, slave, iter) {
2387 port = &(SLAVE_AD_INFO(slave).port);
2388 if (port->aggregator && port->aggregator->is_active) {
2389 aggregator = port->aggregator;
2390 break;
2391 }
2392 }
2393
2394 if (!aggregator)
2395 return -1;
2396
2397 ad_info->aggregator_id = aggregator->aggregator_identifier;
2398 ad_info->ports = aggregator->num_of_ports;
2399 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2400 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2401 ether_addr_copy(ad_info->partner_system,
2402 aggregator->partner_system.mac_addr_value);
2403 return 0;
2404}
2405
2406/* Wrapper used to hold bond->lock so no slave manipulation can occur */
2407int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2408{
2409 int ret;
2410
2411 rcu_read_lock();
2412 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2413 rcu_read_unlock();
2414
2415 return ret;
2416}
2417
2418int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2419{
2420 struct bonding *bond = netdev_priv(dev);
2421 struct slave *slave, *first_ok_slave;
2422 struct aggregator *agg;
2423 struct ad_info ad_info;
2424 struct list_head *iter;
2425 int slaves_in_agg;
2426 int slave_agg_no;
2427 int agg_id;
2428
2429 if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2430 pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
2431 dev->name);
2432 goto err_free;
2433 }
2434
2435 slaves_in_agg = ad_info.ports;
2436 agg_id = ad_info.aggregator_id;
2437
2438 if (slaves_in_agg == 0) {
2439 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2440 goto err_free;
2441 }
2442
2443 slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
2444 first_ok_slave = NULL;
2445
2446 bond_for_each_slave_rcu(bond, slave, iter) {
2447 agg = SLAVE_AD_INFO(slave).port.aggregator;
2448 if (!agg || agg->aggregator_identifier != agg_id)
2449 continue;
2450
2451 if (slave_agg_no >= 0) {
2452 if (!first_ok_slave && SLAVE_IS_OK(slave))
2453 first_ok_slave = slave;
2454 slave_agg_no--;
2455 continue;
2456 }
2457
2458 if (SLAVE_IS_OK(slave)) {
2459 bond_dev_queue_xmit(bond, skb, slave->dev);
2460 goto out;
2461 }
2462 }
2463
2464 if (slave_agg_no >= 0) {
2465 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2466 dev->name, agg_id);
2467 goto err_free;
2468 }
2469
2470 /* we couldn't find any suitable slave after the agg_no, so use the
2471 * first suitable found, if found.
2472 */
2473 if (first_ok_slave)
2474 bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2475 else
2476 goto err_free;
2477
2478out:
2479 return NETDEV_TX_OK;
2480err_free:
2481 /* no suitable interface, frame not sent */
2482 dev_kfree_skb_any(skb);
2483 goto out;
2484}
2485
2486int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2487 struct slave *slave)
2488{
2489 int ret = RX_HANDLER_ANOTHER;
2490 struct lacpdu *lacpdu, _lacpdu;
2491
2492 if (skb->protocol != PKT_TYPE_LACPDU)
2493 return ret;
2494
2495 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2496 if (!lacpdu)
2497 return ret;
2498
2499 read_lock(&bond->lock);
2500 ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
2501 read_unlock(&bond->lock);
2502 return ret;
2503}
2504
2505/**
2506 * bond_3ad_update_lacp_rate - change the lacp rate
2507 * @bond - bonding struct
2508 *
2509 * When modify lacp_rate parameter via sysfs,
2510 * update actor_oper_port_state of each port.
2511 *
2512 * Hold slave->state_machine_lock,
2513 * so we can modify port->actor_oper_port_state,
2514 * no matter bond is up or down.
2515 */
2516void bond_3ad_update_lacp_rate(struct bonding *bond)
2517{
2518 struct port *port = NULL;
2519 struct list_head *iter;
2520 struct slave *slave;
2521 int lacp_fast;
2522
2523 lacp_fast = bond->params.lacp_fast;
2524 bond_for_each_slave(bond, slave, iter) {
2525 port = &(SLAVE_AD_INFO(slave).port);
2526 __get_state_machine_lock(port);
2527 if (lacp_fast)
2528 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2529 else
2530 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2531 __release_state_machine_lock(port);
2532 }
2533}