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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 u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
86 0, 0, 0, 0, 0, 0
87};
88
89static const u16 ad_ticks_per_sec = 1000 / AD_TIMER_INTERVAL;
90static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
91
92const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned = {
93 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02
94};
95
96/* ================= main 802.3ad protocol functions ================== */
97static int ad_lacpdu_send(struct port *port);
98static int ad_marker_send(struct port *port, struct bond_marker *marker);
99static void ad_mux_machine(struct port *port, bool *update_slave_arr);
100static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
101static void ad_tx_machine(struct port *port);
102static void ad_periodic_machine(struct port *port, struct bond_params *bond_params);
103static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
104static void ad_agg_selection_logic(struct aggregator *aggregator,
105 bool *update_slave_arr);
106static void ad_clear_agg(struct aggregator *aggregator);
107static void ad_initialize_agg(struct aggregator *aggregator);
108static void ad_initialize_port(struct port *port, int lacp_fast);
109static void ad_enable_collecting_distributing(struct port *port,
110 bool *update_slave_arr);
111static void ad_disable_collecting_distributing(struct port *port,
112 bool *update_slave_arr);
113static void ad_marker_info_received(struct bond_marker *marker_info,
114 struct port *port);
115static void ad_marker_response_received(struct bond_marker *marker,
116 struct port *port);
117static void ad_update_actor_keys(struct port *port, bool reset);
118
119
120/* ================= api to bonding and kernel code ================== */
121
122/**
123 * __get_bond_by_port - get the port's bonding struct
124 * @port: the port we're looking at
125 *
126 * Return @port's bonding struct, or %NULL if it can't be found.
127 */
128static inline struct bonding *__get_bond_by_port(struct port *port)
129{
130 if (port->slave == NULL)
131 return NULL;
132
133 return bond_get_bond_by_slave(port->slave);
134}
135
136/**
137 * __get_first_agg - get the first aggregator in the bond
138 * @port: the port we're looking at
139 *
140 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
141 * found.
142 * The caller must hold RCU or RTNL lock.
143 */
144static inline struct aggregator *__get_first_agg(struct port *port)
145{
146 struct bonding *bond = __get_bond_by_port(port);
147 struct slave *first_slave;
148 struct aggregator *agg;
149
150 /* If there's no bond for this port, or bond has no slaves */
151 if (bond == NULL)
152 return NULL;
153
154 rcu_read_lock();
155 first_slave = bond_first_slave_rcu(bond);
156 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
157 rcu_read_unlock();
158
159 return agg;
160}
161
162/**
163 * __agg_has_partner - see if we have a partner
164 * @agg: the agregator we're looking at
165 *
166 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
167 * address for the partner). Return 0 if not.
168 */
169static inline int __agg_has_partner(struct aggregator *agg)
170{
171 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
172}
173
174/**
175 * __disable_port - disable the port's slave
176 * @port: the port we're looking at
177 */
178static inline void __disable_port(struct port *port)
179{
180 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
181}
182
183/**
184 * __enable_port - enable the port's slave, if it's up
185 * @port: the port we're looking at
186 */
187static inline void __enable_port(struct port *port)
188{
189 struct slave *slave = port->slave;
190
191 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
192 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
193}
194
195/**
196 * __port_is_enabled - check if the port's slave is in active state
197 * @port: the port we're looking at
198 */
199static inline int __port_is_enabled(struct port *port)
200{
201 return bond_is_active_slave(port->slave);
202}
203
204/**
205 * __get_agg_selection_mode - get the aggregator selection mode
206 * @port: the port we're looking at
207 *
208 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
209 */
210static inline u32 __get_agg_selection_mode(struct port *port)
211{
212 struct bonding *bond = __get_bond_by_port(port);
213
214 if (bond == NULL)
215 return BOND_AD_STABLE;
216
217 return bond->params.ad_select;
218}
219
220/**
221 * __check_agg_selection_timer - check if the selection timer has expired
222 * @port: the port we're looking at
223 */
224static inline int __check_agg_selection_timer(struct port *port)
225{
226 struct bonding *bond = __get_bond_by_port(port);
227
228 if (bond == NULL)
229 return 0;
230
231 return atomic_read(&BOND_AD_INFO(bond).agg_select_timer) ? 1 : 0;
232}
233
234/**
235 * __get_link_speed - get a port's speed
236 * @port: the port we're looking at
237 *
238 * Return @port's speed in 802.3ad enum format. i.e. one of:
239 * 0,
240 * %AD_LINK_SPEED_10MBPS,
241 * %AD_LINK_SPEED_100MBPS,
242 * %AD_LINK_SPEED_1000MBPS,
243 * %AD_LINK_SPEED_2500MBPS,
244 * %AD_LINK_SPEED_5000MBPS,
245 * %AD_LINK_SPEED_10000MBPS
246 * %AD_LINK_SPEED_14000MBPS,
247 * %AD_LINK_SPEED_20000MBPS
248 * %AD_LINK_SPEED_25000MBPS
249 * %AD_LINK_SPEED_40000MBPS
250 * %AD_LINK_SPEED_50000MBPS
251 * %AD_LINK_SPEED_56000MBPS
252 * %AD_LINK_SPEED_100000MBPS
253 * %AD_LINK_SPEED_200000MBPS
254 * %AD_LINK_SPEED_400000MBPS
255 * %AD_LINK_SPEED_800000MBPS
256 */
257static u16 __get_link_speed(struct port *port)
258{
259 struct slave *slave = port->slave;
260 u16 speed;
261
262 /* this if covers only a special case: when the configuration starts
263 * with link down, it sets the speed to 0.
264 * This is done in spite of the fact that the e100 driver reports 0
265 * to be compatible with MVT in the future.
266 */
267 if (slave->link != BOND_LINK_UP)
268 speed = 0;
269 else {
270 switch (slave->speed) {
271 case SPEED_10:
272 speed = AD_LINK_SPEED_10MBPS;
273 break;
274
275 case SPEED_100:
276 speed = AD_LINK_SPEED_100MBPS;
277 break;
278
279 case SPEED_1000:
280 speed = AD_LINK_SPEED_1000MBPS;
281 break;
282
283 case SPEED_2500:
284 speed = AD_LINK_SPEED_2500MBPS;
285 break;
286
287 case SPEED_5000:
288 speed = AD_LINK_SPEED_5000MBPS;
289 break;
290
291 case SPEED_10000:
292 speed = AD_LINK_SPEED_10000MBPS;
293 break;
294
295 case SPEED_14000:
296 speed = AD_LINK_SPEED_14000MBPS;
297 break;
298
299 case SPEED_20000:
300 speed = AD_LINK_SPEED_20000MBPS;
301 break;
302
303 case SPEED_25000:
304 speed = AD_LINK_SPEED_25000MBPS;
305 break;
306
307 case SPEED_40000:
308 speed = AD_LINK_SPEED_40000MBPS;
309 break;
310
311 case SPEED_50000:
312 speed = AD_LINK_SPEED_50000MBPS;
313 break;
314
315 case SPEED_56000:
316 speed = AD_LINK_SPEED_56000MBPS;
317 break;
318
319 case SPEED_100000:
320 speed = AD_LINK_SPEED_100000MBPS;
321 break;
322
323 case SPEED_200000:
324 speed = AD_LINK_SPEED_200000MBPS;
325 break;
326
327 case SPEED_400000:
328 speed = AD_LINK_SPEED_400000MBPS;
329 break;
330
331 case SPEED_800000:
332 speed = AD_LINK_SPEED_800000MBPS;
333 break;
334
335 default:
336 /* unknown speed value from ethtool. shouldn't happen */
337 if (slave->speed != SPEED_UNKNOWN)
338 pr_err_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n",
339 slave->bond->dev->name,
340 slave->dev->name, slave->speed,
341 port->actor_port_number);
342 speed = 0;
343 break;
344 }
345 }
346
347 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n",
348 port->actor_port_number, speed);
349 return speed;
350}
351
352/**
353 * __get_duplex - get a port's duplex
354 * @port: the port we're looking at
355 *
356 * Return @port's duplex in 802.3ad bitmask format. i.e.:
357 * 0x01 if in full duplex
358 * 0x00 otherwise
359 */
360static u8 __get_duplex(struct port *port)
361{
362 struct slave *slave = port->slave;
363 u8 retval = 0x0;
364
365 /* handling a special case: when the configuration starts with
366 * link down, it sets the duplex to 0.
367 */
368 if (slave->link == BOND_LINK_UP) {
369 switch (slave->duplex) {
370 case DUPLEX_FULL:
371 retval = 0x1;
372 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n",
373 port->actor_port_number);
374 break;
375 case DUPLEX_HALF:
376 default:
377 retval = 0x0;
378 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n",
379 port->actor_port_number);
380 break;
381 }
382 }
383 return retval;
384}
385
386static void __ad_actor_update_port(struct port *port)
387{
388 const struct bonding *bond = bond_get_bond_by_slave(port->slave);
389
390 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
391 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
392}
393
394/* Conversions */
395
396/**
397 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
398 * @timer_type: which timer to operate
399 * @par: timer parameter. see below
400 *
401 * If @timer_type is %current_while_timer, @par indicates long/short timer.
402 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
403 * %SLOW_PERIODIC_TIME.
404 */
405static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
406{
407 u16 retval = 0; /* to silence the compiler */
408
409 switch (timer_type) {
410 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
411 if (par)
412 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
413 else
414 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
415 break;
416 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
417 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
418 break;
419 case AD_PERIODIC_TIMER: /* for periodic machine */
420 retval = (par*ad_ticks_per_sec); /* long timeout */
421 break;
422 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
423 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
424 break;
425 case AD_WAIT_WHILE_TIMER: /* for selection machine */
426 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
427 break;
428 }
429
430 return retval;
431}
432
433
434/* ================= ad_rx_machine helper functions ================== */
435
436/**
437 * __choose_matched - update a port's matched variable from a received lacpdu
438 * @lacpdu: the lacpdu we've received
439 * @port: the port we're looking at
440 *
441 * Update the value of the matched variable, using parameter values from a
442 * newly received lacpdu. Parameter values for the partner carried in the
443 * received PDU are compared with the corresponding operational parameter
444 * values for the actor. Matched is set to TRUE if all of these parameters
445 * match and the PDU parameter partner_state.aggregation has the same value as
446 * actor_oper_port_state.aggregation and lacp will actively maintain the link
447 * in the aggregation. Matched is also set to TRUE if the value of
448 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
449 * an individual link and lacp will actively maintain the link. Otherwise,
450 * matched is set to FALSE. LACP is considered to be actively maintaining the
451 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
452 * the actor's actor_oper_port_state.lacp_activity and the PDU's
453 * partner_state.lacp_activity variables are TRUE.
454 *
455 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
456 * used here to implement the language from 802.3ad 43.4.9 that requires
457 * recordPDU to "match" the LACPDU parameters to the stored values.
458 */
459static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
460{
461 /* check if all parameters are alike
462 * or this is individual link(aggregation == FALSE)
463 * then update the state machine Matched variable.
464 */
465 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
466 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
467 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
468 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
469 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
470 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) ||
471 ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0)
472 ) {
473 port->sm_vars |= AD_PORT_MATCHED;
474 } else {
475 port->sm_vars &= ~AD_PORT_MATCHED;
476 }
477}
478
479/**
480 * __record_pdu - record parameters from a received lacpdu
481 * @lacpdu: the lacpdu we've received
482 * @port: the port we're looking at
483 *
484 * Record the parameter values for the Actor carried in a received lacpdu as
485 * the current partner operational parameter values and sets
486 * actor_oper_port_state.defaulted to FALSE.
487 */
488static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
489{
490 if (lacpdu && port) {
491 struct port_params *partner = &port->partner_oper;
492
493 __choose_matched(lacpdu, port);
494 /* record the new parameter values for the partner
495 * operational
496 */
497 partner->port_number = ntohs(lacpdu->actor_port);
498 partner->port_priority = ntohs(lacpdu->actor_port_priority);
499 partner->system = lacpdu->actor_system;
500 partner->system_priority = ntohs(lacpdu->actor_system_priority);
501 partner->key = ntohs(lacpdu->actor_key);
502 partner->port_state = lacpdu->actor_state;
503
504 /* set actor_oper_port_state.defaulted to FALSE */
505 port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED;
506
507 /* set the partner sync. to on if the partner is sync,
508 * and the port is matched
509 */
510 if ((port->sm_vars & AD_PORT_MATCHED) &&
511 (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) {
512 partner->port_state |= LACP_STATE_SYNCHRONIZATION;
513 slave_dbg(port->slave->bond->dev, port->slave->dev,
514 "partner sync=1\n");
515 } else {
516 partner->port_state &= ~LACP_STATE_SYNCHRONIZATION;
517 slave_dbg(port->slave->bond->dev, port->slave->dev,
518 "partner sync=0\n");
519 }
520 }
521}
522
523/**
524 * __record_default - record default parameters
525 * @port: the port we're looking at
526 *
527 * This function records the default parameter values for the partner carried
528 * in the Partner Admin parameters as the current partner operational parameter
529 * values and sets actor_oper_port_state.defaulted to TRUE.
530 */
531static void __record_default(struct port *port)
532{
533 if (port) {
534 /* record the partner admin parameters */
535 memcpy(&port->partner_oper, &port->partner_admin,
536 sizeof(struct port_params));
537
538 /* set actor_oper_port_state.defaulted to true */
539 port->actor_oper_port_state |= LACP_STATE_DEFAULTED;
540 }
541}
542
543/**
544 * __update_selected - update a port's Selected variable from a received lacpdu
545 * @lacpdu: the lacpdu we've received
546 * @port: the port we're looking at
547 *
548 * Update the value of the selected variable, using parameter values from a
549 * newly received lacpdu. The parameter values for the Actor carried in the
550 * received PDU are compared with the corresponding operational parameter
551 * values for the ports partner. If one or more of the comparisons shows that
552 * the value(s) received in the PDU differ from the current operational values,
553 * then selected is set to FALSE and actor_oper_port_state.synchronization is
554 * set to out_of_sync. Otherwise, selected remains unchanged.
555 */
556static void __update_selected(struct lacpdu *lacpdu, struct port *port)
557{
558 if (lacpdu && port) {
559 const struct port_params *partner = &port->partner_oper;
560
561 /* check if any parameter is different then
562 * update the state machine selected variable.
563 */
564 if (ntohs(lacpdu->actor_port) != partner->port_number ||
565 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
566 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
567 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
568 ntohs(lacpdu->actor_key) != partner->key ||
569 (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) {
570 port->sm_vars &= ~AD_PORT_SELECTED;
571 }
572 }
573}
574
575/**
576 * __update_default_selected - update a port's Selected variable from Partner
577 * @port: the port we're looking at
578 *
579 * This function updates the value of the selected variable, using the partner
580 * administrative parameter values. The administrative values are compared with
581 * the corresponding operational parameter values for the partner. If one or
582 * more of the comparisons shows that the administrative value(s) differ from
583 * the current operational values, then Selected is set to FALSE and
584 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
585 * Selected remains unchanged.
586 */
587static void __update_default_selected(struct port *port)
588{
589 if (port) {
590 const struct port_params *admin = &port->partner_admin;
591 const struct port_params *oper = &port->partner_oper;
592
593 /* check if any parameter is different then
594 * update the state machine selected variable.
595 */
596 if (admin->port_number != oper->port_number ||
597 admin->port_priority != oper->port_priority ||
598 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
599 admin->system_priority != oper->system_priority ||
600 admin->key != oper->key ||
601 (admin->port_state & LACP_STATE_AGGREGATION)
602 != (oper->port_state & LACP_STATE_AGGREGATION)) {
603 port->sm_vars &= ~AD_PORT_SELECTED;
604 }
605 }
606}
607
608/**
609 * __update_ntt - update a port's ntt variable from a received lacpdu
610 * @lacpdu: the lacpdu we've received
611 * @port: the port we're looking at
612 *
613 * Updates the value of the ntt variable, using parameter values from a newly
614 * received lacpdu. The parameter values for the partner carried in the
615 * received PDU are compared with the corresponding operational parameter
616 * values for the Actor. If one or more of the comparisons shows that the
617 * value(s) received in the PDU differ from the current operational values,
618 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
619 */
620static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
621{
622 /* validate lacpdu and port */
623 if (lacpdu && port) {
624 /* check if any parameter is different then
625 * update the port->ntt.
626 */
627 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
628 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
629 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
630 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
631 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
632 ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) ||
633 ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) ||
634 ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) ||
635 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION))
636 ) {
637 port->ntt = true;
638 }
639 }
640}
641
642/**
643 * __agg_ports_are_ready - check if all ports in an aggregator are ready
644 * @aggregator: the aggregator we're looking at
645 *
646 */
647static int __agg_ports_are_ready(struct aggregator *aggregator)
648{
649 struct port *port;
650 int retval = 1;
651
652 if (aggregator) {
653 /* scan all ports in this aggregator to verfy if they are
654 * all ready.
655 */
656 for (port = aggregator->lag_ports;
657 port;
658 port = port->next_port_in_aggregator) {
659 if (!(port->sm_vars & AD_PORT_READY_N)) {
660 retval = 0;
661 break;
662 }
663 }
664 }
665
666 return retval;
667}
668
669/**
670 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
671 * @aggregator: the aggregator we're looking at
672 * @val: Should the ports' ready bit be set on or off
673 *
674 */
675static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
676{
677 struct port *port;
678
679 for (port = aggregator->lag_ports; port;
680 port = port->next_port_in_aggregator) {
681 if (val)
682 port->sm_vars |= AD_PORT_READY;
683 else
684 port->sm_vars &= ~AD_PORT_READY;
685 }
686}
687
688static int __agg_active_ports(struct aggregator *agg)
689{
690 struct port *port;
691 int active = 0;
692
693 for (port = agg->lag_ports; port;
694 port = port->next_port_in_aggregator) {
695 if (port->is_enabled)
696 active++;
697 }
698
699 return active;
700}
701
702/**
703 * __get_agg_bandwidth - get the total bandwidth of an aggregator
704 * @aggregator: the aggregator we're looking at
705 *
706 */
707static u32 __get_agg_bandwidth(struct aggregator *aggregator)
708{
709 int nports = __agg_active_ports(aggregator);
710 u32 bandwidth = 0;
711
712 if (nports) {
713 switch (__get_link_speed(aggregator->lag_ports)) {
714 case AD_LINK_SPEED_1MBPS:
715 bandwidth = nports;
716 break;
717 case AD_LINK_SPEED_10MBPS:
718 bandwidth = nports * 10;
719 break;
720 case AD_LINK_SPEED_100MBPS:
721 bandwidth = nports * 100;
722 break;
723 case AD_LINK_SPEED_1000MBPS:
724 bandwidth = nports * 1000;
725 break;
726 case AD_LINK_SPEED_2500MBPS:
727 bandwidth = nports * 2500;
728 break;
729 case AD_LINK_SPEED_5000MBPS:
730 bandwidth = nports * 5000;
731 break;
732 case AD_LINK_SPEED_10000MBPS:
733 bandwidth = nports * 10000;
734 break;
735 case AD_LINK_SPEED_14000MBPS:
736 bandwidth = nports * 14000;
737 break;
738 case AD_LINK_SPEED_20000MBPS:
739 bandwidth = nports * 20000;
740 break;
741 case AD_LINK_SPEED_25000MBPS:
742 bandwidth = nports * 25000;
743 break;
744 case AD_LINK_SPEED_40000MBPS:
745 bandwidth = nports * 40000;
746 break;
747 case AD_LINK_SPEED_50000MBPS:
748 bandwidth = nports * 50000;
749 break;
750 case AD_LINK_SPEED_56000MBPS:
751 bandwidth = nports * 56000;
752 break;
753 case AD_LINK_SPEED_100000MBPS:
754 bandwidth = nports * 100000;
755 break;
756 case AD_LINK_SPEED_200000MBPS:
757 bandwidth = nports * 200000;
758 break;
759 case AD_LINK_SPEED_400000MBPS:
760 bandwidth = nports * 400000;
761 break;
762 case AD_LINK_SPEED_800000MBPS:
763 bandwidth = nports * 800000;
764 break;
765 default:
766 bandwidth = 0; /* to silence the compiler */
767 }
768 }
769 return bandwidth;
770}
771
772/**
773 * __get_active_agg - get the current active aggregator
774 * @aggregator: the aggregator we're looking at
775 *
776 * Caller must hold RCU lock.
777 */
778static struct aggregator *__get_active_agg(struct aggregator *aggregator)
779{
780 struct bonding *bond = aggregator->slave->bond;
781 struct list_head *iter;
782 struct slave *slave;
783
784 bond_for_each_slave_rcu(bond, slave, iter)
785 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
786 return &(SLAVE_AD_INFO(slave)->aggregator);
787
788 return NULL;
789}
790
791/**
792 * __update_lacpdu_from_port - update a port's lacpdu fields
793 * @port: the port we're looking at
794 */
795static inline void __update_lacpdu_from_port(struct port *port)
796{
797 struct lacpdu *lacpdu = &port->lacpdu;
798 const struct port_params *partner = &port->partner_oper;
799
800 /* update current actual Actor parameters
801 * lacpdu->subtype initialized
802 * lacpdu->version_number initialized
803 * lacpdu->tlv_type_actor_info initialized
804 * lacpdu->actor_information_length initialized
805 */
806
807 lacpdu->actor_system_priority = htons(port->actor_system_priority);
808 lacpdu->actor_system = port->actor_system;
809 lacpdu->actor_key = htons(port->actor_oper_port_key);
810 lacpdu->actor_port_priority = htons(port->actor_port_priority);
811 lacpdu->actor_port = htons(port->actor_port_number);
812 lacpdu->actor_state = port->actor_oper_port_state;
813 slave_dbg(port->slave->bond->dev, port->slave->dev,
814 "update lacpdu: actor port state %x\n",
815 port->actor_oper_port_state);
816
817 /* lacpdu->reserved_3_1 initialized
818 * lacpdu->tlv_type_partner_info initialized
819 * lacpdu->partner_information_length initialized
820 */
821
822 lacpdu->partner_system_priority = htons(partner->system_priority);
823 lacpdu->partner_system = partner->system;
824 lacpdu->partner_key = htons(partner->key);
825 lacpdu->partner_port_priority = htons(partner->port_priority);
826 lacpdu->partner_port = htons(partner->port_number);
827 lacpdu->partner_state = partner->port_state;
828
829 /* lacpdu->reserved_3_2 initialized
830 * lacpdu->tlv_type_collector_info initialized
831 * lacpdu->collector_information_length initialized
832 * collector_max_delay initialized
833 * reserved_12[12] initialized
834 * tlv_type_terminator initialized
835 * terminator_length initialized
836 * reserved_50[50] initialized
837 */
838}
839
840/* ================= main 802.3ad protocol code ========================= */
841
842/**
843 * ad_lacpdu_send - send out a lacpdu packet on a given port
844 * @port: the port we're looking at
845 *
846 * Returns: 0 on success
847 * < 0 on error
848 */
849static int ad_lacpdu_send(struct port *port)
850{
851 struct slave *slave = port->slave;
852 struct sk_buff *skb;
853 struct lacpdu_header *lacpdu_header;
854 int length = sizeof(struct lacpdu_header);
855
856 skb = dev_alloc_skb(length);
857 if (!skb)
858 return -ENOMEM;
859
860 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx);
861 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx);
862
863 skb->dev = slave->dev;
864 skb_reset_mac_header(skb);
865 skb->network_header = skb->mac_header + ETH_HLEN;
866 skb->protocol = PKT_TYPE_LACPDU;
867 skb->priority = TC_PRIO_CONTROL;
868
869 lacpdu_header = skb_put(skb, length);
870
871 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
872 /* Note: source address is set to be the member's PERMANENT address,
873 * because we use it to identify loopback lacpdus in receive.
874 */
875 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
876 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
877
878 lacpdu_header->lacpdu = port->lacpdu;
879
880 dev_queue_xmit(skb);
881
882 return 0;
883}
884
885/**
886 * ad_marker_send - send marker information/response on a given port
887 * @port: the port we're looking at
888 * @marker: marker data to send
889 *
890 * Returns: 0 on success
891 * < 0 on error
892 */
893static int ad_marker_send(struct port *port, struct bond_marker *marker)
894{
895 struct slave *slave = port->slave;
896 struct sk_buff *skb;
897 struct bond_marker_header *marker_header;
898 int length = sizeof(struct bond_marker_header);
899
900 skb = dev_alloc_skb(length + 16);
901 if (!skb)
902 return -ENOMEM;
903
904 switch (marker->tlv_type) {
905 case AD_MARKER_INFORMATION_SUBTYPE:
906 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx);
907 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx);
908 break;
909 case AD_MARKER_RESPONSE_SUBTYPE:
910 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx);
911 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx);
912 break;
913 }
914
915 skb_reserve(skb, 16);
916
917 skb->dev = slave->dev;
918 skb_reset_mac_header(skb);
919 skb->network_header = skb->mac_header + ETH_HLEN;
920 skb->protocol = PKT_TYPE_LACPDU;
921
922 marker_header = skb_put(skb, length);
923
924 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
925 /* Note: source address is set to be the member's PERMANENT address,
926 * because we use it to identify loopback MARKERs in receive.
927 */
928 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
929 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
930
931 marker_header->marker = *marker;
932
933 dev_queue_xmit(skb);
934
935 return 0;
936}
937
938/**
939 * ad_mux_machine - handle a port's mux state machine
940 * @port: the port we're looking at
941 * @update_slave_arr: Does slave array need update?
942 */
943static void ad_mux_machine(struct port *port, bool *update_slave_arr)
944{
945 mux_states_t last_state;
946
947 /* keep current State Machine state to compare later if it was
948 * changed
949 */
950 last_state = port->sm_mux_state;
951
952 if (port->sm_vars & AD_PORT_BEGIN) {
953 port->sm_mux_state = AD_MUX_DETACHED;
954 } else {
955 switch (port->sm_mux_state) {
956 case AD_MUX_DETACHED:
957 if ((port->sm_vars & AD_PORT_SELECTED)
958 || (port->sm_vars & AD_PORT_STANDBY))
959 /* if SELECTED or STANDBY */
960 port->sm_mux_state = AD_MUX_WAITING;
961 break;
962 case AD_MUX_WAITING:
963 /* if SELECTED == FALSE return to DETACH state */
964 if (!(port->sm_vars & AD_PORT_SELECTED)) {
965 port->sm_vars &= ~AD_PORT_READY_N;
966 /* in order to withhold the Selection Logic to
967 * check all ports READY_N value every callback
968 * cycle to update ready variable, we check
969 * READY_N and update READY here
970 */
971 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
972 port->sm_mux_state = AD_MUX_DETACHED;
973 break;
974 }
975
976 /* check if the wait_while_timer expired */
977 if (port->sm_mux_timer_counter
978 && !(--port->sm_mux_timer_counter))
979 port->sm_vars |= AD_PORT_READY_N;
980
981 /* in order to withhold the selection logic to check
982 * all ports READY_N value every callback cycle to
983 * update ready variable, we check READY_N and update
984 * READY here
985 */
986 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
987
988 /* if the wait_while_timer expired, and the port is
989 * in READY state, move to ATTACHED state
990 */
991 if ((port->sm_vars & AD_PORT_READY)
992 && !port->sm_mux_timer_counter)
993 port->sm_mux_state = AD_MUX_ATTACHED;
994 break;
995 case AD_MUX_ATTACHED:
996 /* check also if agg_select_timer expired (so the
997 * edable port will take place only after this timer)
998 */
999 if ((port->sm_vars & AD_PORT_SELECTED) &&
1000 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
1001 !__check_agg_selection_timer(port)) {
1002 if (port->aggregator->is_active)
1003 port->sm_mux_state =
1004 AD_MUX_COLLECTING_DISTRIBUTING;
1005 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
1006 (port->sm_vars & AD_PORT_STANDBY)) {
1007 /* if UNSELECTED or STANDBY */
1008 port->sm_vars &= ~AD_PORT_READY_N;
1009 /* in order to withhold the selection logic to
1010 * check all ports READY_N value every callback
1011 * cycle to update ready variable, we check
1012 * READY_N and update READY here
1013 */
1014 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1015 port->sm_mux_state = AD_MUX_DETACHED;
1016 } else if (port->aggregator->is_active) {
1017 port->actor_oper_port_state |=
1018 LACP_STATE_SYNCHRONIZATION;
1019 }
1020 break;
1021 case AD_MUX_COLLECTING_DISTRIBUTING:
1022 if (!(port->sm_vars & AD_PORT_SELECTED) ||
1023 (port->sm_vars & AD_PORT_STANDBY) ||
1024 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
1025 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) {
1026 port->sm_mux_state = AD_MUX_ATTACHED;
1027 } else {
1028 /* if port state hasn't changed make
1029 * sure that a collecting distributing
1030 * port in an active aggregator is enabled
1031 */
1032 if (port->aggregator &&
1033 port->aggregator->is_active &&
1034 !__port_is_enabled(port)) {
1035 __enable_port(port);
1036 *update_slave_arr = true;
1037 }
1038 }
1039 break;
1040 default:
1041 break;
1042 }
1043 }
1044
1045 /* check if the state machine was changed */
1046 if (port->sm_mux_state != last_state) {
1047 slave_dbg(port->slave->bond->dev, port->slave->dev,
1048 "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
1049 port->actor_port_number,
1050 last_state,
1051 port->sm_mux_state);
1052 switch (port->sm_mux_state) {
1053 case AD_MUX_DETACHED:
1054 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1055 ad_disable_collecting_distributing(port,
1056 update_slave_arr);
1057 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1058 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1059 port->ntt = true;
1060 break;
1061 case AD_MUX_WAITING:
1062 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1063 break;
1064 case AD_MUX_ATTACHED:
1065 if (port->aggregator->is_active)
1066 port->actor_oper_port_state |=
1067 LACP_STATE_SYNCHRONIZATION;
1068 else
1069 port->actor_oper_port_state &=
1070 ~LACP_STATE_SYNCHRONIZATION;
1071 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1072 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1073 ad_disable_collecting_distributing(port,
1074 update_slave_arr);
1075 port->ntt = true;
1076 break;
1077 case AD_MUX_COLLECTING_DISTRIBUTING:
1078 port->actor_oper_port_state |= LACP_STATE_COLLECTING;
1079 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
1080 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1081 ad_enable_collecting_distributing(port,
1082 update_slave_arr);
1083 port->ntt = true;
1084 break;
1085 default:
1086 break;
1087 }
1088 }
1089}
1090
1091/**
1092 * ad_rx_machine - handle a port's rx State Machine
1093 * @lacpdu: the lacpdu we've received
1094 * @port: the port we're looking at
1095 *
1096 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1097 * CURRENT. If timer expired set the state machine in the proper state.
1098 * In other cases, this function checks if we need to switch to other state.
1099 */
1100static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1101{
1102 rx_states_t last_state;
1103
1104 /* keep current State Machine state to compare later if it was
1105 * changed
1106 */
1107 last_state = port->sm_rx_state;
1108
1109 if (lacpdu) {
1110 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx);
1111 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx);
1112 }
1113 /* check if state machine should change state */
1114
1115 /* first, check if port was reinitialized */
1116 if (port->sm_vars & AD_PORT_BEGIN) {
1117 port->sm_rx_state = AD_RX_INITIALIZE;
1118 port->sm_vars |= AD_PORT_CHURNED;
1119 /* check if port is not enabled */
1120 } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1121 port->sm_rx_state = AD_RX_PORT_DISABLED;
1122 /* check if new lacpdu arrived */
1123 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1124 (port->sm_rx_state == AD_RX_DEFAULTED) ||
1125 (port->sm_rx_state == AD_RX_CURRENT))) {
1126 if (port->sm_rx_state != AD_RX_CURRENT)
1127 port->sm_vars |= AD_PORT_CHURNED;
1128 port->sm_rx_timer_counter = 0;
1129 port->sm_rx_state = AD_RX_CURRENT;
1130 } else {
1131 /* if timer is on, and if it is expired */
1132 if (port->sm_rx_timer_counter &&
1133 !(--port->sm_rx_timer_counter)) {
1134 switch (port->sm_rx_state) {
1135 case AD_RX_EXPIRED:
1136 port->sm_rx_state = AD_RX_DEFAULTED;
1137 break;
1138 case AD_RX_CURRENT:
1139 port->sm_rx_state = AD_RX_EXPIRED;
1140 break;
1141 default:
1142 break;
1143 }
1144 } else {
1145 /* if no lacpdu arrived and no timer is on */
1146 switch (port->sm_rx_state) {
1147 case AD_RX_PORT_DISABLED:
1148 if (port->is_enabled &&
1149 (port->sm_vars & AD_PORT_LACP_ENABLED))
1150 port->sm_rx_state = AD_RX_EXPIRED;
1151 else if (port->is_enabled
1152 && ((port->sm_vars
1153 & AD_PORT_LACP_ENABLED) == 0))
1154 port->sm_rx_state = AD_RX_LACP_DISABLED;
1155 break;
1156 default:
1157 break;
1158
1159 }
1160 }
1161 }
1162
1163 /* check if the State machine was changed or new lacpdu arrived */
1164 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1165 slave_dbg(port->slave->bond->dev, port->slave->dev,
1166 "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1167 port->actor_port_number,
1168 last_state,
1169 port->sm_rx_state);
1170 switch (port->sm_rx_state) {
1171 case AD_RX_INITIALIZE:
1172 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1173 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1174 else
1175 port->sm_vars |= AD_PORT_LACP_ENABLED;
1176 port->sm_vars &= ~AD_PORT_SELECTED;
1177 __record_default(port);
1178 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1179 port->sm_rx_state = AD_RX_PORT_DISABLED;
1180
1181 fallthrough;
1182 case AD_RX_PORT_DISABLED:
1183 port->sm_vars &= ~AD_PORT_MATCHED;
1184 break;
1185 case AD_RX_LACP_DISABLED:
1186 port->sm_vars &= ~AD_PORT_SELECTED;
1187 __record_default(port);
1188 port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION;
1189 port->sm_vars |= AD_PORT_MATCHED;
1190 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1191 break;
1192 case AD_RX_EXPIRED:
1193 /* Reset of the Synchronization flag (Standard 43.4.12)
1194 * This reset cause to disable this port in the
1195 * COLLECTING_DISTRIBUTING state of the mux machine in
1196 * case of EXPIRED even if LINK_DOWN didn't arrive for
1197 * the port.
1198 */
1199 port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION;
1200 port->sm_vars &= ~AD_PORT_MATCHED;
1201 port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT;
1202 port->partner_oper.port_state |= LACP_STATE_LACP_ACTIVITY;
1203 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1204 port->actor_oper_port_state |= LACP_STATE_EXPIRED;
1205 port->sm_vars |= AD_PORT_CHURNED;
1206 break;
1207 case AD_RX_DEFAULTED:
1208 __update_default_selected(port);
1209 __record_default(port);
1210 port->sm_vars |= AD_PORT_MATCHED;
1211 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1212 break;
1213 case AD_RX_CURRENT:
1214 /* detect loopback situation */
1215 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1216 &(port->actor_system))) {
1217 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n"
1218 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n");
1219 return;
1220 }
1221 __update_selected(lacpdu, port);
1222 __update_ntt(lacpdu, port);
1223 __record_pdu(lacpdu, port);
1224 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT));
1225 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1226 break;
1227 default:
1228 break;
1229 }
1230 }
1231}
1232
1233/**
1234 * ad_churn_machine - handle port churn's state machine
1235 * @port: the port we're looking at
1236 *
1237 */
1238static void ad_churn_machine(struct port *port)
1239{
1240 if (port->sm_vars & AD_PORT_CHURNED) {
1241 port->sm_vars &= ~AD_PORT_CHURNED;
1242 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1243 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1244 port->sm_churn_actor_timer_counter =
1245 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1246 port->sm_churn_partner_timer_counter =
1247 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1248 return;
1249 }
1250 if (port->sm_churn_actor_timer_counter &&
1251 !(--port->sm_churn_actor_timer_counter) &&
1252 port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1253 if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) {
1254 port->sm_churn_actor_state = AD_NO_CHURN;
1255 } else {
1256 port->churn_actor_count++;
1257 port->sm_churn_actor_state = AD_CHURN;
1258 }
1259 }
1260 if (port->sm_churn_partner_timer_counter &&
1261 !(--port->sm_churn_partner_timer_counter) &&
1262 port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1263 if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) {
1264 port->sm_churn_partner_state = AD_NO_CHURN;
1265 } else {
1266 port->churn_partner_count++;
1267 port->sm_churn_partner_state = AD_CHURN;
1268 }
1269 }
1270}
1271
1272/**
1273 * ad_tx_machine - handle a port's tx state machine
1274 * @port: the port we're looking at
1275 */
1276static void ad_tx_machine(struct port *port)
1277{
1278 /* check if tx timer expired, to verify that we do not send more than
1279 * 3 packets per second
1280 */
1281 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1282 /* check if there is something to send */
1283 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1284 __update_lacpdu_from_port(port);
1285
1286 if (ad_lacpdu_send(port) >= 0) {
1287 slave_dbg(port->slave->bond->dev,
1288 port->slave->dev,
1289 "Sent LACPDU on port %d\n",
1290 port->actor_port_number);
1291
1292 /* mark ntt as false, so it will not be sent
1293 * again until demanded
1294 */
1295 port->ntt = false;
1296 }
1297 }
1298 /* restart tx timer(to verify that we will not exceed
1299 * AD_MAX_TX_IN_SECOND
1300 */
1301 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1302 }
1303}
1304
1305/**
1306 * ad_periodic_machine - handle a port's periodic state machine
1307 * @port: the port we're looking at
1308 * @bond_params: bond parameters we will use
1309 *
1310 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1311 */
1312static void ad_periodic_machine(struct port *port, struct bond_params *bond_params)
1313{
1314 periodic_states_t last_state;
1315
1316 /* keep current state machine state to compare later if it was changed */
1317 last_state = port->sm_periodic_state;
1318
1319 /* check if port was reinitialized */
1320 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1321 (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY)) ||
1322 !bond_params->lacp_active) {
1323 port->sm_periodic_state = AD_NO_PERIODIC;
1324 }
1325 /* check if state machine should change state */
1326 else if (port->sm_periodic_timer_counter) {
1327 /* check if periodic state machine expired */
1328 if (!(--port->sm_periodic_timer_counter)) {
1329 /* if expired then do tx */
1330 port->sm_periodic_state = AD_PERIODIC_TX;
1331 } else {
1332 /* If not expired, check if there is some new timeout
1333 * parameter from the partner state
1334 */
1335 switch (port->sm_periodic_state) {
1336 case AD_FAST_PERIODIC:
1337 if (!(port->partner_oper.port_state
1338 & LACP_STATE_LACP_TIMEOUT))
1339 port->sm_periodic_state = AD_SLOW_PERIODIC;
1340 break;
1341 case AD_SLOW_PERIODIC:
1342 if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) {
1343 port->sm_periodic_timer_counter = 0;
1344 port->sm_periodic_state = AD_PERIODIC_TX;
1345 }
1346 break;
1347 default:
1348 break;
1349 }
1350 }
1351 } else {
1352 switch (port->sm_periodic_state) {
1353 case AD_NO_PERIODIC:
1354 port->sm_periodic_state = AD_FAST_PERIODIC;
1355 break;
1356 case AD_PERIODIC_TX:
1357 if (!(port->partner_oper.port_state &
1358 LACP_STATE_LACP_TIMEOUT))
1359 port->sm_periodic_state = AD_SLOW_PERIODIC;
1360 else
1361 port->sm_periodic_state = AD_FAST_PERIODIC;
1362 break;
1363 default:
1364 break;
1365 }
1366 }
1367
1368 /* check if the state machine was changed */
1369 if (port->sm_periodic_state != last_state) {
1370 slave_dbg(port->slave->bond->dev, port->slave->dev,
1371 "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1372 port->actor_port_number, last_state,
1373 port->sm_periodic_state);
1374 switch (port->sm_periodic_state) {
1375 case AD_NO_PERIODIC:
1376 port->sm_periodic_timer_counter = 0;
1377 break;
1378 case AD_FAST_PERIODIC:
1379 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1380 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1381 break;
1382 case AD_SLOW_PERIODIC:
1383 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1384 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1385 break;
1386 case AD_PERIODIC_TX:
1387 port->ntt = true;
1388 break;
1389 default:
1390 break;
1391 }
1392 }
1393}
1394
1395/**
1396 * ad_port_selection_logic - select aggregation groups
1397 * @port: the port we're looking at
1398 * @update_slave_arr: Does slave array need update?
1399 *
1400 * Select aggregation groups, and assign each port for it's aggregetor. The
1401 * selection logic is called in the inititalization (after all the handshkes),
1402 * and after every lacpdu receive (if selected is off).
1403 */
1404static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1405{
1406 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1407 struct port *last_port = NULL, *curr_port;
1408 struct list_head *iter;
1409 struct bonding *bond;
1410 struct slave *slave;
1411 int found = 0;
1412
1413 /* if the port is already Selected, do nothing */
1414 if (port->sm_vars & AD_PORT_SELECTED)
1415 return;
1416
1417 bond = __get_bond_by_port(port);
1418
1419 /* if the port is connected to other aggregator, detach it */
1420 if (port->aggregator) {
1421 /* detach the port from its former aggregator */
1422 temp_aggregator = port->aggregator;
1423 for (curr_port = temp_aggregator->lag_ports; curr_port;
1424 last_port = curr_port,
1425 curr_port = curr_port->next_port_in_aggregator) {
1426 if (curr_port == port) {
1427 temp_aggregator->num_of_ports--;
1428 /* if it is the first port attached to the
1429 * aggregator
1430 */
1431 if (!last_port) {
1432 temp_aggregator->lag_ports =
1433 port->next_port_in_aggregator;
1434 } else {
1435 /* not the first port attached to the
1436 * aggregator
1437 */
1438 last_port->next_port_in_aggregator =
1439 port->next_port_in_aggregator;
1440 }
1441
1442 /* clear the port's relations to this
1443 * aggregator
1444 */
1445 port->aggregator = NULL;
1446 port->next_port_in_aggregator = NULL;
1447 port->actor_port_aggregator_identifier = 0;
1448
1449 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n",
1450 port->actor_port_number,
1451 temp_aggregator->aggregator_identifier);
1452 /* if the aggregator is empty, clear its
1453 * parameters, and set it ready to be attached
1454 */
1455 if (!temp_aggregator->lag_ports)
1456 ad_clear_agg(temp_aggregator);
1457 break;
1458 }
1459 }
1460 if (!curr_port) {
1461 /* meaning: the port was related to an aggregator
1462 * but was not on the aggregator port list
1463 */
1464 net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n",
1465 port->slave->bond->dev->name,
1466 port->slave->dev->name,
1467 port->actor_port_number,
1468 port->aggregator->aggregator_identifier);
1469 }
1470 }
1471 /* search on all aggregators for a suitable aggregator for this port */
1472 bond_for_each_slave(bond, slave, iter) {
1473 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1474
1475 /* keep a free aggregator for later use(if needed) */
1476 if (!aggregator->lag_ports) {
1477 if (!free_aggregator)
1478 free_aggregator = aggregator;
1479 continue;
1480 }
1481 /* check if current aggregator suits us */
1482 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1483 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1484 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1485 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1486 ) &&
1487 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1488 !aggregator->is_individual) /* but is not individual OR */
1489 )
1490 ) {
1491 /* attach to the founded aggregator */
1492 port->aggregator = aggregator;
1493 port->actor_port_aggregator_identifier =
1494 port->aggregator->aggregator_identifier;
1495 port->next_port_in_aggregator = aggregator->lag_ports;
1496 port->aggregator->num_of_ports++;
1497 aggregator->lag_ports = port;
1498 slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n",
1499 port->actor_port_number,
1500 port->aggregator->aggregator_identifier);
1501
1502 /* mark this port as selected */
1503 port->sm_vars |= AD_PORT_SELECTED;
1504 found = 1;
1505 break;
1506 }
1507 }
1508
1509 /* the port couldn't find an aggregator - attach it to a new
1510 * aggregator
1511 */
1512 if (!found) {
1513 if (free_aggregator) {
1514 /* assign port a new aggregator */
1515 port->aggregator = free_aggregator;
1516 port->actor_port_aggregator_identifier =
1517 port->aggregator->aggregator_identifier;
1518
1519 /* update the new aggregator's parameters
1520 * if port was responsed from the end-user
1521 */
1522 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1523 /* if port is full duplex */
1524 port->aggregator->is_individual = false;
1525 else
1526 port->aggregator->is_individual = true;
1527
1528 port->aggregator->actor_admin_aggregator_key =
1529 port->actor_admin_port_key;
1530 port->aggregator->actor_oper_aggregator_key =
1531 port->actor_oper_port_key;
1532 port->aggregator->partner_system =
1533 port->partner_oper.system;
1534 port->aggregator->partner_system_priority =
1535 port->partner_oper.system_priority;
1536 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1537 port->aggregator->receive_state = 1;
1538 port->aggregator->transmit_state = 1;
1539 port->aggregator->lag_ports = port;
1540 port->aggregator->num_of_ports++;
1541
1542 /* mark this port as selected */
1543 port->sm_vars |= AD_PORT_SELECTED;
1544
1545 slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n",
1546 port->actor_port_number,
1547 port->aggregator->aggregator_identifier);
1548 } else {
1549 slave_err(bond->dev, port->slave->dev,
1550 "Port %d did not find a suitable aggregator\n",
1551 port->actor_port_number);
1552 return;
1553 }
1554 }
1555 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1556 * in all aggregator's ports, else set ready=FALSE in all
1557 * aggregator's ports
1558 */
1559 __set_agg_ports_ready(port->aggregator,
1560 __agg_ports_are_ready(port->aggregator));
1561
1562 aggregator = __get_first_agg(port);
1563 ad_agg_selection_logic(aggregator, update_slave_arr);
1564
1565 if (!port->aggregator->is_active)
1566 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1567}
1568
1569/* Decide if "agg" is a better choice for the new active aggregator that
1570 * the current best, according to the ad_select policy.
1571 */
1572static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1573 struct aggregator *curr)
1574{
1575 /* 0. If no best, select current.
1576 *
1577 * 1. If the current agg is not individual, and the best is
1578 * individual, select current.
1579 *
1580 * 2. If current agg is individual and the best is not, keep best.
1581 *
1582 * 3. Therefore, current and best are both individual or both not
1583 * individual, so:
1584 *
1585 * 3a. If current agg partner replied, and best agg partner did not,
1586 * select current.
1587 *
1588 * 3b. If current agg partner did not reply and best agg partner
1589 * did reply, keep best.
1590 *
1591 * 4. Therefore, current and best both have partner replies or
1592 * both do not, so perform selection policy:
1593 *
1594 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1595 * select by bandwidth.
1596 *
1597 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1598 */
1599 if (!best)
1600 return curr;
1601
1602 if (!curr->is_individual && best->is_individual)
1603 return curr;
1604
1605 if (curr->is_individual && !best->is_individual)
1606 return best;
1607
1608 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1609 return curr;
1610
1611 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1612 return best;
1613
1614 switch (__get_agg_selection_mode(curr->lag_ports)) {
1615 case BOND_AD_COUNT:
1616 if (__agg_active_ports(curr) > __agg_active_ports(best))
1617 return curr;
1618
1619 if (__agg_active_ports(curr) < __agg_active_ports(best))
1620 return best;
1621
1622 fallthrough;
1623 case BOND_AD_STABLE:
1624 case BOND_AD_BANDWIDTH:
1625 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1626 return curr;
1627
1628 break;
1629
1630 default:
1631 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n",
1632 curr->slave->bond->dev->name,
1633 curr->slave->dev->name,
1634 __get_agg_selection_mode(curr->lag_ports));
1635 break;
1636 }
1637
1638 return best;
1639}
1640
1641static int agg_device_up(const struct aggregator *agg)
1642{
1643 struct port *port = agg->lag_ports;
1644
1645 if (!port)
1646 return 0;
1647
1648 for (port = agg->lag_ports; port;
1649 port = port->next_port_in_aggregator) {
1650 if (netif_running(port->slave->dev) &&
1651 netif_carrier_ok(port->slave->dev))
1652 return 1;
1653 }
1654
1655 return 0;
1656}
1657
1658/**
1659 * ad_agg_selection_logic - select an aggregation group for a team
1660 * @agg: the aggregator we're looking at
1661 * @update_slave_arr: Does slave array need update?
1662 *
1663 * It is assumed that only one aggregator may be selected for a team.
1664 *
1665 * The logic of this function is to select the aggregator according to
1666 * the ad_select policy:
1667 *
1668 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1669 * it, and to reselect the active aggregator only if the previous
1670 * aggregator has no more ports related to it.
1671 *
1672 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1673 * bandwidth, and reselect whenever a link state change takes place or the
1674 * set of slaves in the bond changes.
1675 *
1676 * BOND_AD_COUNT: select the aggregator with largest number of ports
1677 * (slaves), and reselect whenever a link state change takes place or the
1678 * set of slaves in the bond changes.
1679 *
1680 * FIXME: this function MUST be called with the first agg in the bond, or
1681 * __get_active_agg() won't work correctly. This function should be better
1682 * called with the bond itself, and retrieve the first agg from it.
1683 */
1684static void ad_agg_selection_logic(struct aggregator *agg,
1685 bool *update_slave_arr)
1686{
1687 struct aggregator *best, *active, *origin;
1688 struct bonding *bond = agg->slave->bond;
1689 struct list_head *iter;
1690 struct slave *slave;
1691 struct port *port;
1692
1693 rcu_read_lock();
1694 origin = agg;
1695 active = __get_active_agg(agg);
1696 best = (active && agg_device_up(active)) ? active : NULL;
1697
1698 bond_for_each_slave_rcu(bond, slave, iter) {
1699 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1700
1701 agg->is_active = 0;
1702
1703 if (__agg_active_ports(agg) && agg_device_up(agg))
1704 best = ad_agg_selection_test(best, agg);
1705 }
1706
1707 if (best &&
1708 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1709 /* For the STABLE policy, don't replace the old active
1710 * aggregator if it's still active (it has an answering
1711 * partner) or if both the best and active don't have an
1712 * answering partner.
1713 */
1714 if (active && active->lag_ports &&
1715 __agg_active_ports(active) &&
1716 (__agg_has_partner(active) ||
1717 (!__agg_has_partner(active) &&
1718 !__agg_has_partner(best)))) {
1719 if (!(!active->actor_oper_aggregator_key &&
1720 best->actor_oper_aggregator_key)) {
1721 best = NULL;
1722 active->is_active = 1;
1723 }
1724 }
1725 }
1726
1727 if (best && (best == active)) {
1728 best = NULL;
1729 active->is_active = 1;
1730 }
1731
1732 /* if there is new best aggregator, activate it */
1733 if (best) {
1734 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1735 best->slave ? best->slave->dev->name : "NULL",
1736 best->aggregator_identifier, best->num_of_ports,
1737 best->actor_oper_aggregator_key,
1738 best->partner_oper_aggregator_key,
1739 best->is_individual, best->is_active);
1740 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n",
1741 best->slave ? best->slave->dev->name : "NULL",
1742 best->lag_ports, best->slave);
1743
1744 bond_for_each_slave_rcu(bond, slave, iter) {
1745 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1746
1747 slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1748 agg->aggregator_identifier, agg->num_of_ports,
1749 agg->actor_oper_aggregator_key,
1750 agg->partner_oper_aggregator_key,
1751 agg->is_individual, agg->is_active);
1752 }
1753
1754 /* check if any partner replies */
1755 if (best->is_individual)
1756 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1757 bond->dev->name);
1758
1759 best->is_active = 1;
1760 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n",
1761 best->slave ? best->slave->dev->name : "NULL",
1762 best->aggregator_identifier);
1763 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1764 best->slave ? best->slave->dev->name : "NULL",
1765 best->aggregator_identifier, best->num_of_ports,
1766 best->actor_oper_aggregator_key,
1767 best->partner_oper_aggregator_key,
1768 best->is_individual, best->is_active);
1769
1770 /* disable the ports that were related to the former
1771 * active_aggregator
1772 */
1773 if (active) {
1774 for (port = active->lag_ports; port;
1775 port = port->next_port_in_aggregator) {
1776 __disable_port(port);
1777 }
1778 }
1779 /* Slave array needs update. */
1780 *update_slave_arr = true;
1781 }
1782
1783 /* if the selected aggregator is of join individuals
1784 * (partner_system is NULL), enable their ports
1785 */
1786 active = __get_active_agg(origin);
1787
1788 if (active) {
1789 if (!__agg_has_partner(active)) {
1790 for (port = active->lag_ports; port;
1791 port = port->next_port_in_aggregator) {
1792 __enable_port(port);
1793 }
1794 *update_slave_arr = true;
1795 }
1796 }
1797
1798 rcu_read_unlock();
1799
1800 bond_3ad_set_carrier(bond);
1801}
1802
1803/**
1804 * ad_clear_agg - clear a given aggregator's parameters
1805 * @aggregator: the aggregator we're looking at
1806 */
1807static void ad_clear_agg(struct aggregator *aggregator)
1808{
1809 if (aggregator) {
1810 aggregator->is_individual = false;
1811 aggregator->actor_admin_aggregator_key = 0;
1812 aggregator->actor_oper_aggregator_key = 0;
1813 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1814 aggregator->partner_system_priority = 0;
1815 aggregator->partner_oper_aggregator_key = 0;
1816 aggregator->receive_state = 0;
1817 aggregator->transmit_state = 0;
1818 aggregator->lag_ports = NULL;
1819 aggregator->is_active = 0;
1820 aggregator->num_of_ports = 0;
1821 pr_debug("%s: LAG %d was cleared\n",
1822 aggregator->slave ?
1823 aggregator->slave->dev->name : "NULL",
1824 aggregator->aggregator_identifier);
1825 }
1826}
1827
1828/**
1829 * ad_initialize_agg - initialize a given aggregator's parameters
1830 * @aggregator: the aggregator we're looking at
1831 */
1832static void ad_initialize_agg(struct aggregator *aggregator)
1833{
1834 if (aggregator) {
1835 ad_clear_agg(aggregator);
1836
1837 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1838 aggregator->aggregator_identifier = 0;
1839 aggregator->slave = NULL;
1840 }
1841}
1842
1843/**
1844 * ad_initialize_port - initialize a given port's parameters
1845 * @port: the port we're looking at
1846 * @lacp_fast: boolean. whether fast periodic should be used
1847 */
1848static void ad_initialize_port(struct port *port, int lacp_fast)
1849{
1850 static const struct port_params tmpl = {
1851 .system_priority = 0xffff,
1852 .key = 1,
1853 .port_number = 1,
1854 .port_priority = 0xff,
1855 .port_state = 1,
1856 };
1857 static const struct lacpdu lacpdu = {
1858 .subtype = 0x01,
1859 .version_number = 0x01,
1860 .tlv_type_actor_info = 0x01,
1861 .actor_information_length = 0x14,
1862 .tlv_type_partner_info = 0x02,
1863 .partner_information_length = 0x14,
1864 .tlv_type_collector_info = 0x03,
1865 .collector_information_length = 0x10,
1866 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1867 };
1868
1869 if (port) {
1870 port->actor_port_priority = 0xff;
1871 port->actor_port_aggregator_identifier = 0;
1872 port->ntt = false;
1873 port->actor_admin_port_state = LACP_STATE_AGGREGATION |
1874 LACP_STATE_LACP_ACTIVITY;
1875 port->actor_oper_port_state = LACP_STATE_AGGREGATION |
1876 LACP_STATE_LACP_ACTIVITY;
1877
1878 if (lacp_fast)
1879 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
1880
1881 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1882 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1883
1884 port->is_enabled = true;
1885 /* private parameters */
1886 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1887 port->sm_rx_state = 0;
1888 port->sm_rx_timer_counter = 0;
1889 port->sm_periodic_state = 0;
1890 port->sm_periodic_timer_counter = 0;
1891 port->sm_mux_state = 0;
1892 port->sm_mux_timer_counter = 0;
1893 port->sm_tx_state = 0;
1894 port->aggregator = NULL;
1895 port->next_port_in_aggregator = NULL;
1896 port->transaction_id = 0;
1897
1898 port->sm_churn_actor_timer_counter = 0;
1899 port->sm_churn_actor_state = 0;
1900 port->churn_actor_count = 0;
1901 port->sm_churn_partner_timer_counter = 0;
1902 port->sm_churn_partner_state = 0;
1903 port->churn_partner_count = 0;
1904
1905 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1906 }
1907}
1908
1909/**
1910 * ad_enable_collecting_distributing - enable a port's transmit/receive
1911 * @port: the port we're looking at
1912 * @update_slave_arr: Does slave array need update?
1913 *
1914 * Enable @port if it's in an active aggregator
1915 */
1916static void ad_enable_collecting_distributing(struct port *port,
1917 bool *update_slave_arr)
1918{
1919 if (port->aggregator->is_active) {
1920 slave_dbg(port->slave->bond->dev, port->slave->dev,
1921 "Enabling port %d (LAG %d)\n",
1922 port->actor_port_number,
1923 port->aggregator->aggregator_identifier);
1924 __enable_port(port);
1925 /* Slave array needs update */
1926 *update_slave_arr = true;
1927 }
1928}
1929
1930/**
1931 * ad_disable_collecting_distributing - disable a port's transmit/receive
1932 * @port: the port we're looking at
1933 * @update_slave_arr: Does slave array need update?
1934 */
1935static void ad_disable_collecting_distributing(struct port *port,
1936 bool *update_slave_arr)
1937{
1938 if (port->aggregator &&
1939 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1940 &(null_mac_addr))) {
1941 slave_dbg(port->slave->bond->dev, port->slave->dev,
1942 "Disabling port %d (LAG %d)\n",
1943 port->actor_port_number,
1944 port->aggregator->aggregator_identifier);
1945 __disable_port(port);
1946 /* Slave array needs an update */
1947 *update_slave_arr = true;
1948 }
1949}
1950
1951/**
1952 * ad_marker_info_received - handle receive of a Marker information frame
1953 * @marker_info: Marker info received
1954 * @port: the port we're looking at
1955 */
1956static void ad_marker_info_received(struct bond_marker *marker_info,
1957 struct port *port)
1958{
1959 struct bond_marker marker;
1960
1961 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx);
1962 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx);
1963
1964 /* copy the received marker data to the response marker */
1965 memcpy(&marker, marker_info, sizeof(struct bond_marker));
1966 /* change the marker subtype to marker response */
1967 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1968
1969 /* send the marker response */
1970 if (ad_marker_send(port, &marker) >= 0)
1971 slave_dbg(port->slave->bond->dev, port->slave->dev,
1972 "Sent Marker Response on port %d\n",
1973 port->actor_port_number);
1974}
1975
1976/**
1977 * ad_marker_response_received - handle receive of a marker response frame
1978 * @marker: marker PDU received
1979 * @port: the port we're looking at
1980 *
1981 * This function does nothing since we decided not to implement send and handle
1982 * response for marker PDU's, in this stage, but only to respond to marker
1983 * information.
1984 */
1985static void ad_marker_response_received(struct bond_marker *marker,
1986 struct port *port)
1987{
1988 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx);
1989 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx);
1990
1991 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1992}
1993
1994/* ========= AD exported functions to the main bonding code ========= */
1995
1996/* Check aggregators status in team every T seconds */
1997#define AD_AGGREGATOR_SELECTION_TIMER 8
1998
1999/**
2000 * bond_3ad_initiate_agg_selection - initate aggregator selection
2001 * @bond: bonding struct
2002 * @timeout: timeout value to set
2003 *
2004 * Set the aggregation selection timer, to initiate an agg selection in
2005 * the very near future. Called during first initialization, and during
2006 * any down to up transitions of the bond.
2007 */
2008void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
2009{
2010 atomic_set(&BOND_AD_INFO(bond).agg_select_timer, timeout);
2011}
2012
2013/**
2014 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
2015 * @bond: bonding struct to work on
2016 *
2017 * Can be called only after the mac address of the bond is set.
2018 */
2019void bond_3ad_initialize(struct bonding *bond)
2020{
2021 BOND_AD_INFO(bond).aggregator_identifier = 0;
2022 BOND_AD_INFO(bond).system.sys_priority =
2023 bond->params.ad_actor_sys_prio;
2024 if (is_zero_ether_addr(bond->params.ad_actor_system))
2025 BOND_AD_INFO(bond).system.sys_mac_addr =
2026 *((struct mac_addr *)bond->dev->dev_addr);
2027 else
2028 BOND_AD_INFO(bond).system.sys_mac_addr =
2029 *((struct mac_addr *)bond->params.ad_actor_system);
2030
2031 bond_3ad_initiate_agg_selection(bond,
2032 AD_AGGREGATOR_SELECTION_TIMER *
2033 ad_ticks_per_sec);
2034}
2035
2036/**
2037 * bond_3ad_bind_slave - initialize a slave's port
2038 * @slave: slave struct to work on
2039 *
2040 * Returns: 0 on success
2041 * < 0 on error
2042 */
2043void bond_3ad_bind_slave(struct slave *slave)
2044{
2045 struct bonding *bond = bond_get_bond_by_slave(slave);
2046 struct port *port;
2047 struct aggregator *aggregator;
2048
2049 /* check that the slave has not been initialized yet. */
2050 if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2051
2052 /* port initialization */
2053 port = &(SLAVE_AD_INFO(slave)->port);
2054
2055 ad_initialize_port(port, bond->params.lacp_fast);
2056
2057 port->slave = slave;
2058 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2059 /* key is determined according to the link speed, duplex and
2060 * user key
2061 */
2062 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2063 ad_update_actor_keys(port, false);
2064 /* actor system is the bond's system */
2065 __ad_actor_update_port(port);
2066 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2067 * lacpdu's are sent in one second)
2068 */
2069 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2070
2071 __disable_port(port);
2072
2073 /* aggregator initialization */
2074 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2075
2076 ad_initialize_agg(aggregator);
2077
2078 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2079 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2080 aggregator->slave = slave;
2081 aggregator->is_active = 0;
2082 aggregator->num_of_ports = 0;
2083 }
2084}
2085
2086/**
2087 * bond_3ad_unbind_slave - deinitialize a slave's port
2088 * @slave: slave struct to work on
2089 *
2090 * Search for the aggregator that is related to this port, remove the
2091 * aggregator and assign another aggregator for other port related to it
2092 * (if any), and remove the port.
2093 */
2094void bond_3ad_unbind_slave(struct slave *slave)
2095{
2096 struct port *port, *prev_port, *temp_port;
2097 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2098 int select_new_active_agg = 0;
2099 struct bonding *bond = slave->bond;
2100 struct slave *slave_iter;
2101 struct list_head *iter;
2102 bool dummy_slave_update; /* Ignore this value as caller updates array */
2103
2104 /* Sync against bond_3ad_state_machine_handler() */
2105 spin_lock_bh(&bond->mode_lock);
2106 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2107 port = &(SLAVE_AD_INFO(slave)->port);
2108
2109 /* if slave is null, the whole port is not initialized */
2110 if (!port->slave) {
2111 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n");
2112 goto out;
2113 }
2114
2115 slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n",
2116 aggregator->aggregator_identifier);
2117
2118 /* Tell the partner that this port is not suitable for aggregation */
2119 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
2120 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
2121 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
2122 port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION;
2123 __update_lacpdu_from_port(port);
2124 ad_lacpdu_send(port);
2125
2126 /* check if this aggregator is occupied */
2127 if (aggregator->lag_ports) {
2128 /* check if there are other ports related to this aggregator
2129 * except the port related to this slave(thats ensure us that
2130 * there is a reason to search for new aggregator, and that we
2131 * will find one
2132 */
2133 if ((aggregator->lag_ports != port) ||
2134 (aggregator->lag_ports->next_port_in_aggregator)) {
2135 /* find new aggregator for the related port(s) */
2136 bond_for_each_slave(bond, slave_iter, iter) {
2137 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2138 /* if the new aggregator is empty, or it is
2139 * connected to our port only
2140 */
2141 if (!new_aggregator->lag_ports ||
2142 ((new_aggregator->lag_ports == port) &&
2143 !new_aggregator->lag_ports->next_port_in_aggregator))
2144 break;
2145 }
2146 if (!slave_iter)
2147 new_aggregator = NULL;
2148
2149 /* if new aggregator found, copy the aggregator's
2150 * parameters and connect the related lag_ports to the
2151 * new aggregator
2152 */
2153 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2154 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2155 aggregator->aggregator_identifier,
2156 new_aggregator->aggregator_identifier);
2157
2158 if ((new_aggregator->lag_ports == port) &&
2159 new_aggregator->is_active) {
2160 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2161 select_new_active_agg = 1;
2162 }
2163
2164 new_aggregator->is_individual = aggregator->is_individual;
2165 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2166 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2167 new_aggregator->partner_system = aggregator->partner_system;
2168 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2169 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2170 new_aggregator->receive_state = aggregator->receive_state;
2171 new_aggregator->transmit_state = aggregator->transmit_state;
2172 new_aggregator->lag_ports = aggregator->lag_ports;
2173 new_aggregator->is_active = aggregator->is_active;
2174 new_aggregator->num_of_ports = aggregator->num_of_ports;
2175
2176 /* update the information that is written on
2177 * the ports about the aggregator
2178 */
2179 for (temp_port = aggregator->lag_ports; temp_port;
2180 temp_port = temp_port->next_port_in_aggregator) {
2181 temp_port->aggregator = new_aggregator;
2182 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2183 }
2184
2185 ad_clear_agg(aggregator);
2186
2187 if (select_new_active_agg)
2188 ad_agg_selection_logic(__get_first_agg(port),
2189 &dummy_slave_update);
2190 } else {
2191 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2192 }
2193 } else {
2194 /* in case that the only port related to this
2195 * aggregator is the one we want to remove
2196 */
2197 select_new_active_agg = aggregator->is_active;
2198 ad_clear_agg(aggregator);
2199 if (select_new_active_agg) {
2200 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2201 /* select new active aggregator */
2202 temp_aggregator = __get_first_agg(port);
2203 if (temp_aggregator)
2204 ad_agg_selection_logic(temp_aggregator,
2205 &dummy_slave_update);
2206 }
2207 }
2208 }
2209
2210 slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number);
2211
2212 /* find the aggregator that this port is connected to */
2213 bond_for_each_slave(bond, slave_iter, iter) {
2214 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2215 prev_port = NULL;
2216 /* search the port in the aggregator's related ports */
2217 for (temp_port = temp_aggregator->lag_ports; temp_port;
2218 prev_port = temp_port,
2219 temp_port = temp_port->next_port_in_aggregator) {
2220 if (temp_port == port) {
2221 /* the aggregator found - detach the port from
2222 * this aggregator
2223 */
2224 if (prev_port)
2225 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2226 else
2227 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2228 temp_aggregator->num_of_ports--;
2229 if (__agg_active_ports(temp_aggregator) == 0) {
2230 select_new_active_agg = temp_aggregator->is_active;
2231 if (temp_aggregator->num_of_ports == 0)
2232 ad_clear_agg(temp_aggregator);
2233 if (select_new_active_agg) {
2234 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2235 /* select new active aggregator */
2236 ad_agg_selection_logic(__get_first_agg(port),
2237 &dummy_slave_update);
2238 }
2239 }
2240 break;
2241 }
2242 }
2243 }
2244 port->slave = NULL;
2245
2246out:
2247 spin_unlock_bh(&bond->mode_lock);
2248}
2249
2250/**
2251 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2252 * @bond: bonding struct to work on
2253 *
2254 * If an ad_actor setting gets changed we need to update the individual port
2255 * settings so the bond device will use the new values when it gets upped.
2256 */
2257void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2258{
2259 struct list_head *iter;
2260 struct slave *slave;
2261
2262 ASSERT_RTNL();
2263
2264 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2265 if (is_zero_ether_addr(bond->params.ad_actor_system))
2266 BOND_AD_INFO(bond).system.sys_mac_addr =
2267 *((struct mac_addr *)bond->dev->dev_addr);
2268 else
2269 BOND_AD_INFO(bond).system.sys_mac_addr =
2270 *((struct mac_addr *)bond->params.ad_actor_system);
2271
2272 spin_lock_bh(&bond->mode_lock);
2273 bond_for_each_slave(bond, slave, iter) {
2274 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2275
2276 __ad_actor_update_port(port);
2277 port->ntt = true;
2278 }
2279 spin_unlock_bh(&bond->mode_lock);
2280}
2281
2282/**
2283 * bond_agg_timer_advance - advance agg_select_timer
2284 * @bond: bonding structure
2285 *
2286 * Return true when agg_select_timer reaches 0.
2287 */
2288static bool bond_agg_timer_advance(struct bonding *bond)
2289{
2290 int val, nval;
2291
2292 while (1) {
2293 val = atomic_read(&BOND_AD_INFO(bond).agg_select_timer);
2294 if (!val)
2295 return false;
2296 nval = val - 1;
2297 if (atomic_cmpxchg(&BOND_AD_INFO(bond).agg_select_timer,
2298 val, nval) == val)
2299 break;
2300 }
2301 return nval == 0;
2302}
2303
2304/**
2305 * bond_3ad_state_machine_handler - handle state machines timeout
2306 * @work: work context to fetch bonding struct to work on from
2307 *
2308 * The state machine handling concept in this module is to check every tick
2309 * which state machine should operate any function. The execution order is
2310 * round robin, so when we have an interaction between state machines, the
2311 * reply of one to each other might be delayed until next tick.
2312 *
2313 * This function also complete the initialization when the agg_select_timer
2314 * times out, and it selects an aggregator for the ports that are yet not
2315 * related to any aggregator, and selects the active aggregator for a bond.
2316 */
2317void bond_3ad_state_machine_handler(struct work_struct *work)
2318{
2319 struct bonding *bond = container_of(work, struct bonding,
2320 ad_work.work);
2321 struct aggregator *aggregator;
2322 struct list_head *iter;
2323 struct slave *slave;
2324 struct port *port;
2325 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2326 bool update_slave_arr = false;
2327
2328 /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2329 * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2330 * concurrently due to incoming LACPDU as well.
2331 */
2332 spin_lock_bh(&bond->mode_lock);
2333 rcu_read_lock();
2334
2335 /* check if there are any slaves */
2336 if (!bond_has_slaves(bond))
2337 goto re_arm;
2338
2339 if (bond_agg_timer_advance(bond)) {
2340 slave = bond_first_slave_rcu(bond);
2341 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2342
2343 /* select the active aggregator for the bond */
2344 if (port) {
2345 if (!port->slave) {
2346 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2347 bond->dev->name);
2348 goto re_arm;
2349 }
2350
2351 aggregator = __get_first_agg(port);
2352 ad_agg_selection_logic(aggregator, &update_slave_arr);
2353 }
2354 bond_3ad_set_carrier(bond);
2355 }
2356
2357 /* for each port run the state machines */
2358 bond_for_each_slave_rcu(bond, slave, iter) {
2359 port = &(SLAVE_AD_INFO(slave)->port);
2360 if (!port->slave) {
2361 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2362 bond->dev->name);
2363 goto re_arm;
2364 }
2365
2366 ad_rx_machine(NULL, port);
2367 ad_periodic_machine(port, &bond->params);
2368 ad_port_selection_logic(port, &update_slave_arr);
2369 ad_mux_machine(port, &update_slave_arr);
2370 ad_tx_machine(port);
2371 ad_churn_machine(port);
2372
2373 /* turn off the BEGIN bit, since we already handled it */
2374 if (port->sm_vars & AD_PORT_BEGIN)
2375 port->sm_vars &= ~AD_PORT_BEGIN;
2376 }
2377
2378re_arm:
2379 bond_for_each_slave_rcu(bond, slave, iter) {
2380 if (slave->should_notify) {
2381 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2382 break;
2383 }
2384 }
2385 rcu_read_unlock();
2386 spin_unlock_bh(&bond->mode_lock);
2387
2388 if (update_slave_arr)
2389 bond_slave_arr_work_rearm(bond, 0);
2390
2391 if (should_notify_rtnl && rtnl_trylock()) {
2392 bond_slave_state_notify(bond);
2393 rtnl_unlock();
2394 }
2395 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2396}
2397
2398/**
2399 * bond_3ad_rx_indication - handle a received frame
2400 * @lacpdu: received lacpdu
2401 * @slave: slave struct to work on
2402 *
2403 * It is assumed that frames that were sent on this NIC don't returned as new
2404 * received frames (loopback). Since only the payload is given to this
2405 * function, it check for loopback.
2406 */
2407static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave)
2408{
2409 struct bonding *bond = slave->bond;
2410 int ret = RX_HANDLER_ANOTHER;
2411 struct bond_marker *marker;
2412 struct port *port;
2413 atomic64_t *stat;
2414
2415 port = &(SLAVE_AD_INFO(slave)->port);
2416 if (!port->slave) {
2417 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2418 slave->dev->name, slave->bond->dev->name);
2419 return ret;
2420 }
2421
2422 switch (lacpdu->subtype) {
2423 case AD_TYPE_LACPDU:
2424 ret = RX_HANDLER_CONSUMED;
2425 slave_dbg(slave->bond->dev, slave->dev,
2426 "Received LACPDU on port %d\n",
2427 port->actor_port_number);
2428 /* Protect against concurrent state machines */
2429 spin_lock(&slave->bond->mode_lock);
2430 ad_rx_machine(lacpdu, port);
2431 spin_unlock(&slave->bond->mode_lock);
2432 break;
2433 case AD_TYPE_MARKER:
2434 ret = RX_HANDLER_CONSUMED;
2435 /* No need to convert fields to Little Endian since we
2436 * don't use the marker's fields.
2437 */
2438 marker = (struct bond_marker *)lacpdu;
2439 switch (marker->tlv_type) {
2440 case AD_MARKER_INFORMATION_SUBTYPE:
2441 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n",
2442 port->actor_port_number);
2443 ad_marker_info_received(marker, port);
2444 break;
2445 case AD_MARKER_RESPONSE_SUBTYPE:
2446 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n",
2447 port->actor_port_number);
2448 ad_marker_response_received(marker, port);
2449 break;
2450 default:
2451 slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n",
2452 port->actor_port_number);
2453 stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx;
2454 atomic64_inc(stat);
2455 stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx;
2456 atomic64_inc(stat);
2457 }
2458 break;
2459 default:
2460 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx);
2461 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx);
2462 }
2463
2464 return ret;
2465}
2466
2467/**
2468 * ad_update_actor_keys - Update the oper / admin keys for a port based on
2469 * its current speed and duplex settings.
2470 *
2471 * @port: the port we'are looking at
2472 * @reset: Boolean to just reset the speed and the duplex part of the key
2473 *
2474 * The logic to change the oper / admin keys is:
2475 * (a) A full duplex port can participate in LACP with partner.
2476 * (b) When the speed is changed, LACP need to be reinitiated.
2477 */
2478static void ad_update_actor_keys(struct port *port, bool reset)
2479{
2480 u8 duplex = 0;
2481 u16 ospeed = 0, speed = 0;
2482 u16 old_oper_key = port->actor_oper_port_key;
2483
2484 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2485 if (!reset) {
2486 speed = __get_link_speed(port);
2487 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2488 duplex = __get_duplex(port);
2489 port->actor_admin_port_key |= (speed << 1) | duplex;
2490 }
2491 port->actor_oper_port_key = port->actor_admin_port_key;
2492
2493 if (old_oper_key != port->actor_oper_port_key) {
2494 /* Only 'duplex' port participates in LACP */
2495 if (duplex)
2496 port->sm_vars |= AD_PORT_LACP_ENABLED;
2497 else
2498 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2499
2500 if (!reset) {
2501 if (!speed) {
2502 slave_err(port->slave->bond->dev,
2503 port->slave->dev,
2504 "speed changed to 0 on port %d\n",
2505 port->actor_port_number);
2506 } else if (duplex && ospeed != speed) {
2507 /* Speed change restarts LACP state-machine */
2508 port->sm_vars |= AD_PORT_BEGIN;
2509 }
2510 }
2511 }
2512}
2513
2514/**
2515 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2516 * change indication
2517 *
2518 * @slave: slave struct to work on
2519 *
2520 * Handle reselection of aggregator (if needed) for this port.
2521 */
2522void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2523{
2524 struct port *port;
2525
2526 port = &(SLAVE_AD_INFO(slave)->port);
2527
2528 /* if slave is null, the whole port is not initialized */
2529 if (!port->slave) {
2530 slave_warn(slave->bond->dev, slave->dev,
2531 "speed/duplex changed for uninitialized port\n");
2532 return;
2533 }
2534
2535 spin_lock_bh(&slave->bond->mode_lock);
2536 ad_update_actor_keys(port, false);
2537 spin_unlock_bh(&slave->bond->mode_lock);
2538 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n",
2539 port->actor_port_number);
2540}
2541
2542/**
2543 * bond_3ad_handle_link_change - handle a slave's link status change indication
2544 * @slave: slave struct to work on
2545 * @link: whether the link is now up or down
2546 *
2547 * Handle reselection of aggregator (if needed) for this port.
2548 */
2549void bond_3ad_handle_link_change(struct slave *slave, char link)
2550{
2551 struct aggregator *agg;
2552 struct port *port;
2553 bool dummy;
2554
2555 port = &(SLAVE_AD_INFO(slave)->port);
2556
2557 /* if slave is null, the whole port is not initialized */
2558 if (!port->slave) {
2559 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n");
2560 return;
2561 }
2562
2563 spin_lock_bh(&slave->bond->mode_lock);
2564 /* on link down we are zeroing duplex and speed since
2565 * some of the adaptors(ce1000.lan) report full duplex/speed
2566 * instead of N/A(duplex) / 0(speed).
2567 *
2568 * on link up we are forcing recheck on the duplex and speed since
2569 * some of he adaptors(ce1000.lan) report.
2570 */
2571 if (link == BOND_LINK_UP) {
2572 port->is_enabled = true;
2573 ad_update_actor_keys(port, false);
2574 } else {
2575 /* link has failed */
2576 port->is_enabled = false;
2577 ad_update_actor_keys(port, true);
2578 }
2579 agg = __get_first_agg(port);
2580 ad_agg_selection_logic(agg, &dummy);
2581
2582 spin_unlock_bh(&slave->bond->mode_lock);
2583
2584 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n",
2585 port->actor_port_number,
2586 link == BOND_LINK_UP ? "UP" : "DOWN");
2587
2588 /* RTNL is held and mode_lock is released so it's safe
2589 * to update slave_array here.
2590 */
2591 bond_update_slave_arr(slave->bond, NULL);
2592}
2593
2594/**
2595 * bond_3ad_set_carrier - set link state for bonding master
2596 * @bond: bonding structure
2597 *
2598 * if we have an active aggregator, we're up, if not, we're down.
2599 * Presumes that we cannot have an active aggregator if there are
2600 * no slaves with link up.
2601 *
2602 * This behavior complies with IEEE 802.3 section 43.3.9.
2603 *
2604 * Called by bond_set_carrier(). Return zero if carrier state does not
2605 * change, nonzero if it does.
2606 */
2607int bond_3ad_set_carrier(struct bonding *bond)
2608{
2609 struct aggregator *active;
2610 struct slave *first_slave;
2611 int ret = 1;
2612
2613 rcu_read_lock();
2614 first_slave = bond_first_slave_rcu(bond);
2615 if (!first_slave) {
2616 ret = 0;
2617 goto out;
2618 }
2619 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2620 if (active) {
2621 /* are enough slaves available to consider link up? */
2622 if (__agg_active_ports(active) < bond->params.min_links) {
2623 if (netif_carrier_ok(bond->dev)) {
2624 netif_carrier_off(bond->dev);
2625 goto out;
2626 }
2627 } else if (!netif_carrier_ok(bond->dev)) {
2628 netif_carrier_on(bond->dev);
2629 goto out;
2630 }
2631 } else if (netif_carrier_ok(bond->dev)) {
2632 netif_carrier_off(bond->dev);
2633 }
2634out:
2635 rcu_read_unlock();
2636 return ret;
2637}
2638
2639/**
2640 * __bond_3ad_get_active_agg_info - get information of the active aggregator
2641 * @bond: bonding struct to work on
2642 * @ad_info: ad_info struct to fill with the bond's info
2643 *
2644 * Returns: 0 on success
2645 * < 0 on error
2646 */
2647int __bond_3ad_get_active_agg_info(struct bonding *bond,
2648 struct ad_info *ad_info)
2649{
2650 struct aggregator *aggregator = NULL;
2651 struct list_head *iter;
2652 struct slave *slave;
2653 struct port *port;
2654
2655 bond_for_each_slave_rcu(bond, slave, iter) {
2656 port = &(SLAVE_AD_INFO(slave)->port);
2657 if (port->aggregator && port->aggregator->is_active) {
2658 aggregator = port->aggregator;
2659 break;
2660 }
2661 }
2662
2663 if (!aggregator)
2664 return -1;
2665
2666 ad_info->aggregator_id = aggregator->aggregator_identifier;
2667 ad_info->ports = __agg_active_ports(aggregator);
2668 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2669 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2670 ether_addr_copy(ad_info->partner_system,
2671 aggregator->partner_system.mac_addr_value);
2672 return 0;
2673}
2674
2675int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2676{
2677 int ret;
2678
2679 rcu_read_lock();
2680 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2681 rcu_read_unlock();
2682
2683 return ret;
2684}
2685
2686int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2687 struct slave *slave)
2688{
2689 struct lacpdu *lacpdu, _lacpdu;
2690
2691 if (skb->protocol != PKT_TYPE_LACPDU)
2692 return RX_HANDLER_ANOTHER;
2693
2694 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2695 return RX_HANDLER_ANOTHER;
2696
2697 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2698 if (!lacpdu) {
2699 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx);
2700 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx);
2701 return RX_HANDLER_ANOTHER;
2702 }
2703
2704 return bond_3ad_rx_indication(lacpdu, slave);
2705}
2706
2707/**
2708 * bond_3ad_update_lacp_rate - change the lacp rate
2709 * @bond: bonding struct
2710 *
2711 * When modify lacp_rate parameter via sysfs,
2712 * update actor_oper_port_state of each port.
2713 *
2714 * Hold bond->mode_lock,
2715 * so we can modify port->actor_oper_port_state,
2716 * no matter bond is up or down.
2717 */
2718void bond_3ad_update_lacp_rate(struct bonding *bond)
2719{
2720 struct port *port = NULL;
2721 struct list_head *iter;
2722 struct slave *slave;
2723 int lacp_fast;
2724
2725 lacp_fast = bond->params.lacp_fast;
2726 spin_lock_bh(&bond->mode_lock);
2727 bond_for_each_slave(bond, slave, iter) {
2728 port = &(SLAVE_AD_INFO(slave)->port);
2729 if (lacp_fast)
2730 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
2731 else
2732 port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT;
2733 }
2734 spin_unlock_bh(&bond->mode_lock);
2735}
2736
2737size_t bond_3ad_stats_size(void)
2738{
2739 return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */
2740 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */
2741 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */
2742 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */
2743 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */
2744 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */
2745 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */
2746 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */
2747 nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */
2748}
2749
2750int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats)
2751{
2752 u64 val;
2753
2754 val = atomic64_read(&stats->lacpdu_rx);
2755 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val,
2756 BOND_3AD_STAT_PAD))
2757 return -EMSGSIZE;
2758 val = atomic64_read(&stats->lacpdu_tx);
2759 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val,
2760 BOND_3AD_STAT_PAD))
2761 return -EMSGSIZE;
2762 val = atomic64_read(&stats->lacpdu_unknown_rx);
2763 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val,
2764 BOND_3AD_STAT_PAD))
2765 return -EMSGSIZE;
2766 val = atomic64_read(&stats->lacpdu_illegal_rx);
2767 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val,
2768 BOND_3AD_STAT_PAD))
2769 return -EMSGSIZE;
2770
2771 val = atomic64_read(&stats->marker_rx);
2772 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val,
2773 BOND_3AD_STAT_PAD))
2774 return -EMSGSIZE;
2775 val = atomic64_read(&stats->marker_tx);
2776 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val,
2777 BOND_3AD_STAT_PAD))
2778 return -EMSGSIZE;
2779 val = atomic64_read(&stats->marker_resp_rx);
2780 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val,
2781 BOND_3AD_STAT_PAD))
2782 return -EMSGSIZE;
2783 val = atomic64_read(&stats->marker_resp_tx);
2784 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val,
2785 BOND_3AD_STAT_PAD))
2786 return -EMSGSIZE;
2787 val = atomic64_read(&stats->marker_unknown_rx);
2788 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val,
2789 BOND_3AD_STAT_PAD))
2790 return -EMSGSIZE;
2791
2792 return 0;
2793}
1/*
2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; either version 2 of the License, or (at your option)
7 * any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59
16 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 */
22
23#include <linux/skbuff.h>
24#include <linux/if_ether.h>
25#include <linux/netdevice.h>
26#include <linux/spinlock.h>
27#include <linux/ethtool.h>
28#include <linux/etherdevice.h>
29#include <linux/if_bonding.h>
30#include <linux/pkt_sched.h>
31#include <net/net_namespace.h>
32#include <net/bonding.h>
33#include <net/bond_3ad.h>
34
35/* General definitions */
36#define AD_SHORT_TIMEOUT 1
37#define AD_LONG_TIMEOUT 0
38#define AD_STANDBY 0x2
39#define AD_MAX_TX_IN_SECOND 3
40#define AD_COLLECTOR_MAX_DELAY 0
41
42/* Timer definitions (43.4.4 in the 802.3ad standard) */
43#define AD_FAST_PERIODIC_TIME 1
44#define AD_SLOW_PERIODIC_TIME 30
45#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
46#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
47#define AD_CHURN_DETECTION_TIME 60
48#define AD_AGGREGATE_WAIT_TIME 2
49
50/* Port state definitions (43.4.2.2 in the 802.3ad standard) */
51#define AD_STATE_LACP_ACTIVITY 0x1
52#define AD_STATE_LACP_TIMEOUT 0x2
53#define AD_STATE_AGGREGATION 0x4
54#define AD_STATE_SYNCHRONIZATION 0x8
55#define AD_STATE_COLLECTING 0x10
56#define AD_STATE_DISTRIBUTING 0x20
57#define AD_STATE_DEFAULTED 0x40
58#define AD_STATE_EXPIRED 0x80
59
60/* Port Variables definitions used by the State Machines (43.4.7 in the
61 * 802.3ad standard)
62 */
63#define AD_PORT_BEGIN 0x1
64#define AD_PORT_LACP_ENABLED 0x2
65#define AD_PORT_ACTOR_CHURN 0x4
66#define AD_PORT_PARTNER_CHURN 0x8
67#define AD_PORT_READY 0x10
68#define AD_PORT_READY_N 0x20
69#define AD_PORT_MATCHED 0x40
70#define AD_PORT_STANDBY 0x80
71#define AD_PORT_SELECTED 0x100
72#define AD_PORT_MOVED 0x200
73#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
74
75/* Port Key definitions
76 * key is determined according to the link speed, duplex and
77 * user key (which is yet not supported)
78 * --------------------------------------------------------------
79 * Port key | User key (10 bits) | Speed (5 bits) | Duplex|
80 * --------------------------------------------------------------
81 * |15 6|5 1|0
82 */
83#define AD_DUPLEX_KEY_MASKS 0x1
84#define AD_SPEED_KEY_MASKS 0x3E
85#define AD_USER_KEY_MASKS 0xFFC0
86
87enum ad_link_speed_type {
88 AD_LINK_SPEED_1MBPS = 1,
89 AD_LINK_SPEED_10MBPS,
90 AD_LINK_SPEED_100MBPS,
91 AD_LINK_SPEED_1000MBPS,
92 AD_LINK_SPEED_2500MBPS,
93 AD_LINK_SPEED_10000MBPS,
94 AD_LINK_SPEED_20000MBPS,
95 AD_LINK_SPEED_40000MBPS,
96 AD_LINK_SPEED_56000MBPS,
97 AD_LINK_SPEED_100000MBPS,
98};
99
100/* compare MAC addresses */
101#define MAC_ADDRESS_EQUAL(A, B) \
102 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
103
104static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
105 0, 0, 0, 0, 0, 0
106};
107static u16 ad_ticks_per_sec;
108static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
109
110static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned =
111 MULTICAST_LACPDU_ADDR;
112
113/* ================= main 802.3ad protocol functions ================== */
114static int ad_lacpdu_send(struct port *port);
115static int ad_marker_send(struct port *port, struct bond_marker *marker);
116static void ad_mux_machine(struct port *port, bool *update_slave_arr);
117static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
118static void ad_tx_machine(struct port *port);
119static void ad_periodic_machine(struct port *port);
120static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
121static void ad_agg_selection_logic(struct aggregator *aggregator,
122 bool *update_slave_arr);
123static void ad_clear_agg(struct aggregator *aggregator);
124static void ad_initialize_agg(struct aggregator *aggregator);
125static void ad_initialize_port(struct port *port, int lacp_fast);
126static void ad_enable_collecting_distributing(struct port *port,
127 bool *update_slave_arr);
128static void ad_disable_collecting_distributing(struct port *port,
129 bool *update_slave_arr);
130static void ad_marker_info_received(struct bond_marker *marker_info,
131 struct port *port);
132static void ad_marker_response_received(struct bond_marker *marker,
133 struct port *port);
134static void ad_update_actor_keys(struct port *port, bool reset);
135
136
137/* ================= api to bonding and kernel code ================== */
138
139/**
140 * __get_bond_by_port - get the port's bonding struct
141 * @port: the port we're looking at
142 *
143 * Return @port's bonding struct, or %NULL if it can't be found.
144 */
145static inline struct bonding *__get_bond_by_port(struct port *port)
146{
147 if (port->slave == NULL)
148 return NULL;
149
150 return bond_get_bond_by_slave(port->slave);
151}
152
153/**
154 * __get_first_agg - get the first aggregator in the bond
155 * @bond: the bond we're looking at
156 *
157 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
158 * found.
159 * The caller must hold RCU or RTNL lock.
160 */
161static inline struct aggregator *__get_first_agg(struct port *port)
162{
163 struct bonding *bond = __get_bond_by_port(port);
164 struct slave *first_slave;
165 struct aggregator *agg;
166
167 /* If there's no bond for this port, or bond has no slaves */
168 if (bond == NULL)
169 return NULL;
170
171 rcu_read_lock();
172 first_slave = bond_first_slave_rcu(bond);
173 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
174 rcu_read_unlock();
175
176 return agg;
177}
178
179/**
180 * __agg_has_partner - see if we have a partner
181 * @agg: the agregator we're looking at
182 *
183 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
184 * address for the partner). Return 0 if not.
185 */
186static inline int __agg_has_partner(struct aggregator *agg)
187{
188 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
189}
190
191/**
192 * __disable_port - disable the port's slave
193 * @port: the port we're looking at
194 */
195static inline void __disable_port(struct port *port)
196{
197 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
198}
199
200/**
201 * __enable_port - enable the port's slave, if it's up
202 * @port: the port we're looking at
203 */
204static inline void __enable_port(struct port *port)
205{
206 struct slave *slave = port->slave;
207
208 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
209 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
210}
211
212/**
213 * __port_is_enabled - check if the port's slave is in active state
214 * @port: the port we're looking at
215 */
216static inline int __port_is_enabled(struct port *port)
217{
218 return bond_is_active_slave(port->slave);
219}
220
221/**
222 * __get_agg_selection_mode - get the aggregator selection mode
223 * @port: the port we're looking at
224 *
225 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
226 */
227static inline u32 __get_agg_selection_mode(struct port *port)
228{
229 struct bonding *bond = __get_bond_by_port(port);
230
231 if (bond == NULL)
232 return BOND_AD_STABLE;
233
234 return bond->params.ad_select;
235}
236
237/**
238 * __check_agg_selection_timer - check if the selection timer has expired
239 * @port: the port we're looking at
240 */
241static inline int __check_agg_selection_timer(struct port *port)
242{
243 struct bonding *bond = __get_bond_by_port(port);
244
245 if (bond == NULL)
246 return 0;
247
248 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
249}
250
251/**
252 * __get_link_speed - get a port's speed
253 * @port: the port we're looking at
254 *
255 * Return @port's speed in 802.3ad enum format. i.e. one of:
256 * 0,
257 * %AD_LINK_SPEED_10MBPS,
258 * %AD_LINK_SPEED_100MBPS,
259 * %AD_LINK_SPEED_1000MBPS,
260 * %AD_LINK_SPEED_2500MBPS,
261 * %AD_LINK_SPEED_10000MBPS
262 * %AD_LINK_SPEED_20000MBPS
263 * %AD_LINK_SPEED_40000MBPS
264 * %AD_LINK_SPEED_56000MBPS
265 * %AD_LINK_SPEED_100000MBPS
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_10MBPS;
283 break;
284
285 case SPEED_100:
286 speed = AD_LINK_SPEED_100MBPS;
287 break;
288
289 case SPEED_1000:
290 speed = AD_LINK_SPEED_1000MBPS;
291 break;
292
293 case SPEED_2500:
294 speed = AD_LINK_SPEED_2500MBPS;
295 break;
296
297 case SPEED_10000:
298 speed = AD_LINK_SPEED_10000MBPS;
299 break;
300
301 case SPEED_20000:
302 speed = AD_LINK_SPEED_20000MBPS;
303 break;
304
305 case SPEED_40000:
306 speed = AD_LINK_SPEED_40000MBPS;
307 break;
308
309 case SPEED_56000:
310 speed = AD_LINK_SPEED_56000MBPS;
311 break;
312
313 case SPEED_100000:
314 speed = AD_LINK_SPEED_100000MBPS;
315 break;
316
317 default:
318 /* unknown speed value from ethtool. shouldn't happen */
319 speed = 0;
320 break;
321 }
322 }
323
324 netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
325 port->actor_port_number, speed);
326 return speed;
327}
328
329/**
330 * __get_duplex - get a port's duplex
331 * @port: the port we're looking at
332 *
333 * Return @port's duplex in 802.3ad bitmask format. i.e.:
334 * 0x01 if in full duplex
335 * 0x00 otherwise
336 */
337static u8 __get_duplex(struct port *port)
338{
339 struct slave *slave = port->slave;
340 u8 retval = 0x0;
341
342 /* handling a special case: when the configuration starts with
343 * link down, it sets the duplex to 0.
344 */
345 if (slave->link == BOND_LINK_UP) {
346 switch (slave->duplex) {
347 case DUPLEX_FULL:
348 retval = 0x1;
349 netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
350 port->actor_port_number);
351 break;
352 case DUPLEX_HALF:
353 default:
354 retval = 0x0;
355 netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
356 port->actor_port_number);
357 break;
358 }
359 }
360 return retval;
361}
362
363static void __ad_actor_update_port(struct port *port)
364{
365 const struct bonding *bond = bond_get_bond_by_slave(port->slave);
366
367 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
368 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
369}
370
371/* Conversions */
372
373/**
374 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
375 * @timer_type: which timer to operate
376 * @par: timer parameter. see below
377 *
378 * If @timer_type is %current_while_timer, @par indicates long/short timer.
379 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
380 * %SLOW_PERIODIC_TIME.
381 */
382static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
383{
384 u16 retval = 0; /* to silence the compiler */
385
386 switch (timer_type) {
387 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
388 if (par)
389 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
390 else
391 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
392 break;
393 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
394 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
395 break;
396 case AD_PERIODIC_TIMER: /* for periodic machine */
397 retval = (par*ad_ticks_per_sec); /* long timeout */
398 break;
399 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
400 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
401 break;
402 case AD_WAIT_WHILE_TIMER: /* for selection machine */
403 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
404 break;
405 }
406
407 return retval;
408}
409
410
411/* ================= ad_rx_machine helper functions ================== */
412
413/**
414 * __choose_matched - update a port's matched variable from a received lacpdu
415 * @lacpdu: the lacpdu we've received
416 * @port: the port we're looking at
417 *
418 * Update the value of the matched variable, using parameter values from a
419 * newly received lacpdu. Parameter values for the partner carried in the
420 * received PDU are compared with the corresponding operational parameter
421 * values for the actor. Matched is set to TRUE if all of these parameters
422 * match and the PDU parameter partner_state.aggregation has the same value as
423 * actor_oper_port_state.aggregation and lacp will actively maintain the link
424 * in the aggregation. Matched is also set to TRUE if the value of
425 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
426 * an individual link and lacp will actively maintain the link. Otherwise,
427 * matched is set to FALSE. LACP is considered to be actively maintaining the
428 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
429 * the actor's actor_oper_port_state.lacp_activity and the PDU's
430 * partner_state.lacp_activity variables are TRUE.
431 *
432 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
433 * used here to implement the language from 802.3ad 43.4.9 that requires
434 * recordPDU to "match" the LACPDU parameters to the stored values.
435 */
436static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
437{
438 /* check if all parameters are alike
439 * or this is individual link(aggregation == FALSE)
440 * then update the state machine Matched variable.
441 */
442 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
443 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
444 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
445 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
446 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
447 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
448 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
449 ) {
450 port->sm_vars |= AD_PORT_MATCHED;
451 } else {
452 port->sm_vars &= ~AD_PORT_MATCHED;
453 }
454}
455
456/**
457 * __record_pdu - record parameters from a received lacpdu
458 * @lacpdu: the lacpdu we've received
459 * @port: the port we're looking at
460 *
461 * Record the parameter values for the Actor carried in a received lacpdu as
462 * the current partner operational parameter values and sets
463 * actor_oper_port_state.defaulted to FALSE.
464 */
465static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
466{
467 if (lacpdu && port) {
468 struct port_params *partner = &port->partner_oper;
469
470 __choose_matched(lacpdu, port);
471 /* record the new parameter values for the partner
472 * operational
473 */
474 partner->port_number = ntohs(lacpdu->actor_port);
475 partner->port_priority = ntohs(lacpdu->actor_port_priority);
476 partner->system = lacpdu->actor_system;
477 partner->system_priority = ntohs(lacpdu->actor_system_priority);
478 partner->key = ntohs(lacpdu->actor_key);
479 partner->port_state = lacpdu->actor_state;
480
481 /* set actor_oper_port_state.defaulted to FALSE */
482 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
483
484 /* set the partner sync. to on if the partner is sync,
485 * and the port is matched
486 */
487 if ((port->sm_vars & AD_PORT_MATCHED) &&
488 (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
489 partner->port_state |= AD_STATE_SYNCHRONIZATION;
490 pr_debug("%s partner sync=1\n", port->slave->dev->name);
491 } else {
492 partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
493 pr_debug("%s partner sync=0\n", port->slave->dev->name);
494 }
495 }
496}
497
498/**
499 * __record_default - record default parameters
500 * @port: the port we're looking at
501 *
502 * This function records the default parameter values for the partner carried
503 * in the Partner Admin parameters as the current partner operational parameter
504 * values and sets actor_oper_port_state.defaulted to TRUE.
505 */
506static void __record_default(struct port *port)
507{
508 if (port) {
509 /* record the partner admin parameters */
510 memcpy(&port->partner_oper, &port->partner_admin,
511 sizeof(struct port_params));
512
513 /* set actor_oper_port_state.defaulted to true */
514 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
515 }
516}
517
518/**
519 * __update_selected - update a port's Selected variable from a received lacpdu
520 * @lacpdu: the lacpdu we've received
521 * @port: the port we're looking at
522 *
523 * Update the value of the selected variable, using parameter values from a
524 * newly received lacpdu. The parameter values for the Actor carried in the
525 * received PDU are compared with the corresponding operational parameter
526 * values for the ports partner. If one or more of the comparisons shows that
527 * the value(s) received in the PDU differ from the current operational values,
528 * then selected is set to FALSE and actor_oper_port_state.synchronization is
529 * set to out_of_sync. Otherwise, selected remains unchanged.
530 */
531static void __update_selected(struct lacpdu *lacpdu, struct port *port)
532{
533 if (lacpdu && port) {
534 const struct port_params *partner = &port->partner_oper;
535
536 /* check if any parameter is different then
537 * update the state machine selected variable.
538 */
539 if (ntohs(lacpdu->actor_port) != partner->port_number ||
540 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
541 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
542 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
543 ntohs(lacpdu->actor_key) != partner->key ||
544 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
545 port->sm_vars &= ~AD_PORT_SELECTED;
546 }
547 }
548}
549
550/**
551 * __update_default_selected - update a port's Selected variable from Partner
552 * @port: the port we're looking at
553 *
554 * This function updates the value of the selected variable, using the partner
555 * administrative parameter values. The administrative values are compared with
556 * the corresponding operational parameter values for the partner. If one or
557 * more of the comparisons shows that the administrative value(s) differ from
558 * the current operational values, then Selected is set to FALSE and
559 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
560 * Selected remains unchanged.
561 */
562static void __update_default_selected(struct port *port)
563{
564 if (port) {
565 const struct port_params *admin = &port->partner_admin;
566 const struct port_params *oper = &port->partner_oper;
567
568 /* check if any parameter is different then
569 * update the state machine selected variable.
570 */
571 if (admin->port_number != oper->port_number ||
572 admin->port_priority != oper->port_priority ||
573 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
574 admin->system_priority != oper->system_priority ||
575 admin->key != oper->key ||
576 (admin->port_state & AD_STATE_AGGREGATION)
577 != (oper->port_state & AD_STATE_AGGREGATION)) {
578 port->sm_vars &= ~AD_PORT_SELECTED;
579 }
580 }
581}
582
583/**
584 * __update_ntt - update a port's ntt variable from a received lacpdu
585 * @lacpdu: the lacpdu we've received
586 * @port: the port we're looking at
587 *
588 * Updates the value of the ntt variable, using parameter values from a newly
589 * received lacpdu. The parameter values for the partner carried in the
590 * received PDU are compared with the corresponding operational parameter
591 * values for the Actor. If one or more of the comparisons shows that the
592 * value(s) received in the PDU differ from the current operational values,
593 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
594 */
595static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
596{
597 /* validate lacpdu and port */
598 if (lacpdu && port) {
599 /* check if any parameter is different then
600 * update the port->ntt.
601 */
602 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
603 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
604 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
605 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
606 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
607 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
608 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
609 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
610 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
611 ) {
612 port->ntt = true;
613 }
614 }
615}
616
617/**
618 * __agg_ports_are_ready - check if all ports in an aggregator are ready
619 * @aggregator: the aggregator we're looking at
620 *
621 */
622static int __agg_ports_are_ready(struct aggregator *aggregator)
623{
624 struct port *port;
625 int retval = 1;
626
627 if (aggregator) {
628 /* scan all ports in this aggregator to verfy if they are
629 * all ready.
630 */
631 for (port = aggregator->lag_ports;
632 port;
633 port = port->next_port_in_aggregator) {
634 if (!(port->sm_vars & AD_PORT_READY_N)) {
635 retval = 0;
636 break;
637 }
638 }
639 }
640
641 return retval;
642}
643
644/**
645 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
646 * @aggregator: the aggregator we're looking at
647 * @val: Should the ports' ready bit be set on or off
648 *
649 */
650static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
651{
652 struct port *port;
653
654 for (port = aggregator->lag_ports; port;
655 port = port->next_port_in_aggregator) {
656 if (val)
657 port->sm_vars |= AD_PORT_READY;
658 else
659 port->sm_vars &= ~AD_PORT_READY;
660 }
661}
662
663static int __agg_active_ports(struct aggregator *agg)
664{
665 struct port *port;
666 int active = 0;
667
668 for (port = agg->lag_ports; port;
669 port = port->next_port_in_aggregator) {
670 if (port->is_enabled)
671 active++;
672 }
673
674 return active;
675}
676
677/**
678 * __get_agg_bandwidth - get the total bandwidth of an aggregator
679 * @aggregator: the aggregator we're looking at
680 *
681 */
682static u32 __get_agg_bandwidth(struct aggregator *aggregator)
683{
684 int nports = __agg_active_ports(aggregator);
685 u32 bandwidth = 0;
686
687 if (nports) {
688 switch (__get_link_speed(aggregator->lag_ports)) {
689 case AD_LINK_SPEED_1MBPS:
690 bandwidth = nports;
691 break;
692 case AD_LINK_SPEED_10MBPS:
693 bandwidth = nports * 10;
694 break;
695 case AD_LINK_SPEED_100MBPS:
696 bandwidth = nports * 100;
697 break;
698 case AD_LINK_SPEED_1000MBPS:
699 bandwidth = nports * 1000;
700 break;
701 case AD_LINK_SPEED_2500MBPS:
702 bandwidth = nports * 2500;
703 break;
704 case AD_LINK_SPEED_10000MBPS:
705 bandwidth = nports * 10000;
706 break;
707 case AD_LINK_SPEED_20000MBPS:
708 bandwidth = nports * 20000;
709 break;
710 case AD_LINK_SPEED_40000MBPS:
711 bandwidth = nports * 40000;
712 break;
713 case AD_LINK_SPEED_56000MBPS:
714 bandwidth = nports * 56000;
715 break;
716 case AD_LINK_SPEED_100000MBPS:
717 bandwidth = nports * 100000;
718 break;
719 default:
720 bandwidth = 0; /* to silence the compiler */
721 }
722 }
723 return bandwidth;
724}
725
726/**
727 * __get_active_agg - get the current active aggregator
728 * @aggregator: the aggregator we're looking at
729 *
730 * Caller must hold RCU lock.
731 */
732static struct aggregator *__get_active_agg(struct aggregator *aggregator)
733{
734 struct bonding *bond = aggregator->slave->bond;
735 struct list_head *iter;
736 struct slave *slave;
737
738 bond_for_each_slave_rcu(bond, slave, iter)
739 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
740 return &(SLAVE_AD_INFO(slave)->aggregator);
741
742 return NULL;
743}
744
745/**
746 * __update_lacpdu_from_port - update a port's lacpdu fields
747 * @port: the port we're looking at
748 */
749static inline void __update_lacpdu_from_port(struct port *port)
750{
751 struct lacpdu *lacpdu = &port->lacpdu;
752 const struct port_params *partner = &port->partner_oper;
753
754 /* update current actual Actor parameters
755 * lacpdu->subtype initialized
756 * lacpdu->version_number initialized
757 * lacpdu->tlv_type_actor_info initialized
758 * lacpdu->actor_information_length initialized
759 */
760
761 lacpdu->actor_system_priority = htons(port->actor_system_priority);
762 lacpdu->actor_system = port->actor_system;
763 lacpdu->actor_key = htons(port->actor_oper_port_key);
764 lacpdu->actor_port_priority = htons(port->actor_port_priority);
765 lacpdu->actor_port = htons(port->actor_port_number);
766 lacpdu->actor_state = port->actor_oper_port_state;
767 pr_debug("update lacpdu: %s, actor port state %x\n",
768 port->slave->dev->name, port->actor_oper_port_state);
769
770 /* lacpdu->reserved_3_1 initialized
771 * lacpdu->tlv_type_partner_info initialized
772 * lacpdu->partner_information_length initialized
773 */
774
775 lacpdu->partner_system_priority = htons(partner->system_priority);
776 lacpdu->partner_system = partner->system;
777 lacpdu->partner_key = htons(partner->key);
778 lacpdu->partner_port_priority = htons(partner->port_priority);
779 lacpdu->partner_port = htons(partner->port_number);
780 lacpdu->partner_state = partner->port_state;
781
782 /* lacpdu->reserved_3_2 initialized
783 * lacpdu->tlv_type_collector_info initialized
784 * lacpdu->collector_information_length initialized
785 * collector_max_delay initialized
786 * reserved_12[12] initialized
787 * tlv_type_terminator initialized
788 * terminator_length initialized
789 * reserved_50[50] initialized
790 */
791}
792
793/* ================= main 802.3ad protocol code ========================= */
794
795/**
796 * ad_lacpdu_send - send out a lacpdu packet on a given port
797 * @port: the port we're looking at
798 *
799 * Returns: 0 on success
800 * < 0 on error
801 */
802static int ad_lacpdu_send(struct port *port)
803{
804 struct slave *slave = port->slave;
805 struct sk_buff *skb;
806 struct lacpdu_header *lacpdu_header;
807 int length = sizeof(struct lacpdu_header);
808
809 skb = dev_alloc_skb(length);
810 if (!skb)
811 return -ENOMEM;
812
813 skb->dev = slave->dev;
814 skb_reset_mac_header(skb);
815 skb->network_header = skb->mac_header + ETH_HLEN;
816 skb->protocol = PKT_TYPE_LACPDU;
817 skb->priority = TC_PRIO_CONTROL;
818
819 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
820
821 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
822 /* Note: source address is set to be the member's PERMANENT address,
823 * because we use it to identify loopback lacpdus in receive.
824 */
825 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
826 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
827
828 lacpdu_header->lacpdu = port->lacpdu;
829
830 dev_queue_xmit(skb);
831
832 return 0;
833}
834
835/**
836 * ad_marker_send - send marker information/response on a given port
837 * @port: the port we're looking at
838 * @marker: marker data to send
839 *
840 * Returns: 0 on success
841 * < 0 on error
842 */
843static int ad_marker_send(struct port *port, struct bond_marker *marker)
844{
845 struct slave *slave = port->slave;
846 struct sk_buff *skb;
847 struct bond_marker_header *marker_header;
848 int length = sizeof(struct bond_marker_header);
849
850 skb = dev_alloc_skb(length + 16);
851 if (!skb)
852 return -ENOMEM;
853
854 skb_reserve(skb, 16);
855
856 skb->dev = slave->dev;
857 skb_reset_mac_header(skb);
858 skb->network_header = skb->mac_header + ETH_HLEN;
859 skb->protocol = PKT_TYPE_LACPDU;
860
861 marker_header = (struct bond_marker_header *)skb_put(skb, length);
862
863 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
864 /* Note: source address is set to be the member's PERMANENT address,
865 * because we use it to identify loopback MARKERs in receive.
866 */
867 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
868 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
869
870 marker_header->marker = *marker;
871
872 dev_queue_xmit(skb);
873
874 return 0;
875}
876
877/**
878 * ad_mux_machine - handle a port's mux state machine
879 * @port: the port we're looking at
880 * @update_slave_arr: Does slave array need update?
881 */
882static void ad_mux_machine(struct port *port, bool *update_slave_arr)
883{
884 mux_states_t last_state;
885
886 /* keep current State Machine state to compare later if it was
887 * changed
888 */
889 last_state = port->sm_mux_state;
890
891 if (port->sm_vars & AD_PORT_BEGIN) {
892 port->sm_mux_state = AD_MUX_DETACHED;
893 } else {
894 switch (port->sm_mux_state) {
895 case AD_MUX_DETACHED:
896 if ((port->sm_vars & AD_PORT_SELECTED)
897 || (port->sm_vars & AD_PORT_STANDBY))
898 /* if SELECTED or STANDBY */
899 port->sm_mux_state = AD_MUX_WAITING;
900 break;
901 case AD_MUX_WAITING:
902 /* if SELECTED == FALSE return to DETACH state */
903 if (!(port->sm_vars & AD_PORT_SELECTED)) {
904 port->sm_vars &= ~AD_PORT_READY_N;
905 /* in order to withhold the Selection Logic to
906 * check all ports READY_N value every callback
907 * cycle to update ready variable, we check
908 * READY_N and update READY here
909 */
910 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
911 port->sm_mux_state = AD_MUX_DETACHED;
912 break;
913 }
914
915 /* check if the wait_while_timer expired */
916 if (port->sm_mux_timer_counter
917 && !(--port->sm_mux_timer_counter))
918 port->sm_vars |= AD_PORT_READY_N;
919
920 /* in order to withhold the selection logic to check
921 * all ports READY_N value every callback cycle to
922 * update ready variable, we check READY_N and update
923 * READY here
924 */
925 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
926
927 /* if the wait_while_timer expired, and the port is
928 * in READY state, move to ATTACHED state
929 */
930 if ((port->sm_vars & AD_PORT_READY)
931 && !port->sm_mux_timer_counter)
932 port->sm_mux_state = AD_MUX_ATTACHED;
933 break;
934 case AD_MUX_ATTACHED:
935 /* check also if agg_select_timer expired (so the
936 * edable port will take place only after this timer)
937 */
938 if ((port->sm_vars & AD_PORT_SELECTED) &&
939 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
940 !__check_agg_selection_timer(port)) {
941 if (port->aggregator->is_active)
942 port->sm_mux_state =
943 AD_MUX_COLLECTING_DISTRIBUTING;
944 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
945 (port->sm_vars & AD_PORT_STANDBY)) {
946 /* if UNSELECTED or STANDBY */
947 port->sm_vars &= ~AD_PORT_READY_N;
948 /* in order to withhold the selection logic to
949 * check all ports READY_N value every callback
950 * cycle to update ready variable, we check
951 * READY_N and update READY here
952 */
953 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
954 port->sm_mux_state = AD_MUX_DETACHED;
955 } else if (port->aggregator->is_active) {
956 port->actor_oper_port_state |=
957 AD_STATE_SYNCHRONIZATION;
958 }
959 break;
960 case AD_MUX_COLLECTING_DISTRIBUTING:
961 if (!(port->sm_vars & AD_PORT_SELECTED) ||
962 (port->sm_vars & AD_PORT_STANDBY) ||
963 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
964 !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
965 port->sm_mux_state = AD_MUX_ATTACHED;
966 } else {
967 /* if port state hasn't changed make
968 * sure that a collecting distributing
969 * port in an active aggregator is enabled
970 */
971 if (port->aggregator &&
972 port->aggregator->is_active &&
973 !__port_is_enabled(port)) {
974
975 __enable_port(port);
976 }
977 }
978 break;
979 default:
980 break;
981 }
982 }
983
984 /* check if the state machine was changed */
985 if (port->sm_mux_state != last_state) {
986 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
987 port->actor_port_number,
988 port->slave->dev->name,
989 last_state,
990 port->sm_mux_state);
991 switch (port->sm_mux_state) {
992 case AD_MUX_DETACHED:
993 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
994 ad_disable_collecting_distributing(port,
995 update_slave_arr);
996 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
997 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
998 port->ntt = true;
999 break;
1000 case AD_MUX_WAITING:
1001 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1002 break;
1003 case AD_MUX_ATTACHED:
1004 if (port->aggregator->is_active)
1005 port->actor_oper_port_state |=
1006 AD_STATE_SYNCHRONIZATION;
1007 else
1008 port->actor_oper_port_state &=
1009 ~AD_STATE_SYNCHRONIZATION;
1010 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1011 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1012 ad_disable_collecting_distributing(port,
1013 update_slave_arr);
1014 port->ntt = true;
1015 break;
1016 case AD_MUX_COLLECTING_DISTRIBUTING:
1017 port->actor_oper_port_state |= AD_STATE_COLLECTING;
1018 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1019 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1020 ad_enable_collecting_distributing(port,
1021 update_slave_arr);
1022 port->ntt = true;
1023 break;
1024 default:
1025 break;
1026 }
1027 }
1028}
1029
1030/**
1031 * ad_rx_machine - handle a port's rx State Machine
1032 * @lacpdu: the lacpdu we've received
1033 * @port: the port we're looking at
1034 *
1035 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1036 * CURRENT. If timer expired set the state machine in the proper state.
1037 * In other cases, this function checks if we need to switch to other state.
1038 */
1039static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1040{
1041 rx_states_t last_state;
1042
1043 /* keep current State Machine state to compare later if it was
1044 * changed
1045 */
1046 last_state = port->sm_rx_state;
1047
1048 /* check if state machine should change state */
1049
1050 /* first, check if port was reinitialized */
1051 if (port->sm_vars & AD_PORT_BEGIN) {
1052 port->sm_rx_state = AD_RX_INITIALIZE;
1053 port->sm_vars |= AD_PORT_CHURNED;
1054 /* check if port is not enabled */
1055 } else if (!(port->sm_vars & AD_PORT_BEGIN)
1056 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1057 port->sm_rx_state = AD_RX_PORT_DISABLED;
1058 /* check if new lacpdu arrived */
1059 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1060 (port->sm_rx_state == AD_RX_DEFAULTED) ||
1061 (port->sm_rx_state == AD_RX_CURRENT))) {
1062 if (port->sm_rx_state != AD_RX_CURRENT)
1063 port->sm_vars |= AD_PORT_CHURNED;
1064 port->sm_rx_timer_counter = 0;
1065 port->sm_rx_state = AD_RX_CURRENT;
1066 } else {
1067 /* if timer is on, and if it is expired */
1068 if (port->sm_rx_timer_counter &&
1069 !(--port->sm_rx_timer_counter)) {
1070 switch (port->sm_rx_state) {
1071 case AD_RX_EXPIRED:
1072 port->sm_rx_state = AD_RX_DEFAULTED;
1073 break;
1074 case AD_RX_CURRENT:
1075 port->sm_rx_state = AD_RX_EXPIRED;
1076 break;
1077 default:
1078 break;
1079 }
1080 } else {
1081 /* if no lacpdu arrived and no timer is on */
1082 switch (port->sm_rx_state) {
1083 case AD_RX_PORT_DISABLED:
1084 if (port->sm_vars & AD_PORT_MOVED)
1085 port->sm_rx_state = AD_RX_INITIALIZE;
1086 else if (port->is_enabled
1087 && (port->sm_vars
1088 & AD_PORT_LACP_ENABLED))
1089 port->sm_rx_state = AD_RX_EXPIRED;
1090 else if (port->is_enabled
1091 && ((port->sm_vars
1092 & AD_PORT_LACP_ENABLED) == 0))
1093 port->sm_rx_state = AD_RX_LACP_DISABLED;
1094 break;
1095 default:
1096 break;
1097
1098 }
1099 }
1100 }
1101
1102 /* check if the State machine was changed or new lacpdu arrived */
1103 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1104 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1105 port->actor_port_number,
1106 port->slave->dev->name,
1107 last_state,
1108 port->sm_rx_state);
1109 switch (port->sm_rx_state) {
1110 case AD_RX_INITIALIZE:
1111 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1112 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1113 else
1114 port->sm_vars |= AD_PORT_LACP_ENABLED;
1115 port->sm_vars &= ~AD_PORT_SELECTED;
1116 __record_default(port);
1117 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1118 port->sm_vars &= ~AD_PORT_MOVED;
1119 port->sm_rx_state = AD_RX_PORT_DISABLED;
1120
1121 /* Fall Through */
1122 case AD_RX_PORT_DISABLED:
1123 port->sm_vars &= ~AD_PORT_MATCHED;
1124 break;
1125 case AD_RX_LACP_DISABLED:
1126 port->sm_vars &= ~AD_PORT_SELECTED;
1127 __record_default(port);
1128 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1129 port->sm_vars |= AD_PORT_MATCHED;
1130 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1131 break;
1132 case AD_RX_EXPIRED:
1133 /* Reset of the Synchronization flag (Standard 43.4.12)
1134 * This reset cause to disable this port in the
1135 * COLLECTING_DISTRIBUTING state of the mux machine in
1136 * case of EXPIRED even if LINK_DOWN didn't arrive for
1137 * the port.
1138 */
1139 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1140 port->sm_vars &= ~AD_PORT_MATCHED;
1141 port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1142 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1143 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1144 port->actor_oper_port_state |= AD_STATE_EXPIRED;
1145 port->sm_vars |= AD_PORT_CHURNED;
1146 break;
1147 case AD_RX_DEFAULTED:
1148 __update_default_selected(port);
1149 __record_default(port);
1150 port->sm_vars |= AD_PORT_MATCHED;
1151 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1152 break;
1153 case AD_RX_CURRENT:
1154 /* detect loopback situation */
1155 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1156 &(port->actor_system))) {
1157 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1158 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1159 port->slave->dev->name);
1160 return;
1161 }
1162 __update_selected(lacpdu, port);
1163 __update_ntt(lacpdu, port);
1164 __record_pdu(lacpdu, port);
1165 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1166 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1167 break;
1168 default:
1169 break;
1170 }
1171 }
1172}
1173
1174/**
1175 * ad_churn_machine - handle port churn's state machine
1176 * @port: the port we're looking at
1177 *
1178 */
1179static void ad_churn_machine(struct port *port)
1180{
1181 if (port->sm_vars & AD_PORT_CHURNED) {
1182 port->sm_vars &= ~AD_PORT_CHURNED;
1183 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1184 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1185 port->sm_churn_actor_timer_counter =
1186 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1187 port->sm_churn_partner_timer_counter =
1188 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1189 return;
1190 }
1191 if (port->sm_churn_actor_timer_counter &&
1192 !(--port->sm_churn_actor_timer_counter) &&
1193 port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1194 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1195 port->sm_churn_actor_state = AD_NO_CHURN;
1196 } else {
1197 port->churn_actor_count++;
1198 port->sm_churn_actor_state = AD_CHURN;
1199 }
1200 }
1201 if (port->sm_churn_partner_timer_counter &&
1202 !(--port->sm_churn_partner_timer_counter) &&
1203 port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1204 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1205 port->sm_churn_partner_state = AD_NO_CHURN;
1206 } else {
1207 port->churn_partner_count++;
1208 port->sm_churn_partner_state = AD_CHURN;
1209 }
1210 }
1211}
1212
1213/**
1214 * ad_tx_machine - handle a port's tx state machine
1215 * @port: the port we're looking at
1216 */
1217static void ad_tx_machine(struct port *port)
1218{
1219 /* check if tx timer expired, to verify that we do not send more than
1220 * 3 packets per second
1221 */
1222 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1223 /* check if there is something to send */
1224 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1225 __update_lacpdu_from_port(port);
1226
1227 if (ad_lacpdu_send(port) >= 0) {
1228 pr_debug("Sent LACPDU on port %d\n",
1229 port->actor_port_number);
1230
1231 /* mark ntt as false, so it will not be sent
1232 * again until demanded
1233 */
1234 port->ntt = false;
1235 }
1236 }
1237 /* restart tx timer(to verify that we will not exceed
1238 * AD_MAX_TX_IN_SECOND
1239 */
1240 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1241 }
1242}
1243
1244/**
1245 * ad_periodic_machine - handle a port's periodic state machine
1246 * @port: the port we're looking at
1247 *
1248 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1249 */
1250static void ad_periodic_machine(struct port *port)
1251{
1252 periodic_states_t last_state;
1253
1254 /* keep current state machine state to compare later if it was changed */
1255 last_state = port->sm_periodic_state;
1256
1257 /* check if port was reinitialized */
1258 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1259 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1260 ) {
1261 port->sm_periodic_state = AD_NO_PERIODIC;
1262 }
1263 /* check if state machine should change state */
1264 else if (port->sm_periodic_timer_counter) {
1265 /* check if periodic state machine expired */
1266 if (!(--port->sm_periodic_timer_counter)) {
1267 /* if expired then do tx */
1268 port->sm_periodic_state = AD_PERIODIC_TX;
1269 } else {
1270 /* If not expired, check if there is some new timeout
1271 * parameter from the partner state
1272 */
1273 switch (port->sm_periodic_state) {
1274 case AD_FAST_PERIODIC:
1275 if (!(port->partner_oper.port_state
1276 & AD_STATE_LACP_TIMEOUT))
1277 port->sm_periodic_state = AD_SLOW_PERIODIC;
1278 break;
1279 case AD_SLOW_PERIODIC:
1280 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1281 port->sm_periodic_timer_counter = 0;
1282 port->sm_periodic_state = AD_PERIODIC_TX;
1283 }
1284 break;
1285 default:
1286 break;
1287 }
1288 }
1289 } else {
1290 switch (port->sm_periodic_state) {
1291 case AD_NO_PERIODIC:
1292 port->sm_periodic_state = AD_FAST_PERIODIC;
1293 break;
1294 case AD_PERIODIC_TX:
1295 if (!(port->partner_oper.port_state &
1296 AD_STATE_LACP_TIMEOUT))
1297 port->sm_periodic_state = AD_SLOW_PERIODIC;
1298 else
1299 port->sm_periodic_state = AD_FAST_PERIODIC;
1300 break;
1301 default:
1302 break;
1303 }
1304 }
1305
1306 /* check if the state machine was changed */
1307 if (port->sm_periodic_state != last_state) {
1308 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1309 port->actor_port_number, last_state,
1310 port->sm_periodic_state);
1311 switch (port->sm_periodic_state) {
1312 case AD_NO_PERIODIC:
1313 port->sm_periodic_timer_counter = 0;
1314 break;
1315 case AD_FAST_PERIODIC:
1316 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1317 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1318 break;
1319 case AD_SLOW_PERIODIC:
1320 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1321 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1322 break;
1323 case AD_PERIODIC_TX:
1324 port->ntt = true;
1325 break;
1326 default:
1327 break;
1328 }
1329 }
1330}
1331
1332/**
1333 * ad_port_selection_logic - select aggregation groups
1334 * @port: the port we're looking at
1335 * @update_slave_arr: Does slave array need update?
1336 *
1337 * Select aggregation groups, and assign each port for it's aggregetor. The
1338 * selection logic is called in the inititalization (after all the handshkes),
1339 * and after every lacpdu receive (if selected is off).
1340 */
1341static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1342{
1343 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1344 struct port *last_port = NULL, *curr_port;
1345 struct list_head *iter;
1346 struct bonding *bond;
1347 struct slave *slave;
1348 int found = 0;
1349
1350 /* if the port is already Selected, do nothing */
1351 if (port->sm_vars & AD_PORT_SELECTED)
1352 return;
1353
1354 bond = __get_bond_by_port(port);
1355
1356 /* if the port is connected to other aggregator, detach it */
1357 if (port->aggregator) {
1358 /* detach the port from its former aggregator */
1359 temp_aggregator = port->aggregator;
1360 for (curr_port = temp_aggregator->lag_ports; curr_port;
1361 last_port = curr_port,
1362 curr_port = curr_port->next_port_in_aggregator) {
1363 if (curr_port == port) {
1364 temp_aggregator->num_of_ports--;
1365 /* if it is the first port attached to the
1366 * aggregator
1367 */
1368 if (!last_port) {
1369 temp_aggregator->lag_ports =
1370 port->next_port_in_aggregator;
1371 } else {
1372 /* not the first port attached to the
1373 * aggregator
1374 */
1375 last_port->next_port_in_aggregator =
1376 port->next_port_in_aggregator;
1377 }
1378
1379 /* clear the port's relations to this
1380 * aggregator
1381 */
1382 port->aggregator = NULL;
1383 port->next_port_in_aggregator = NULL;
1384 port->actor_port_aggregator_identifier = 0;
1385
1386 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1387 port->actor_port_number,
1388 temp_aggregator->aggregator_identifier);
1389 /* if the aggregator is empty, clear its
1390 * parameters, and set it ready to be attached
1391 */
1392 if (!temp_aggregator->lag_ports)
1393 ad_clear_agg(temp_aggregator);
1394 break;
1395 }
1396 }
1397 if (!curr_port) {
1398 /* meaning: the port was related to an aggregator
1399 * but was not on the aggregator port list
1400 */
1401 net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1402 port->slave->bond->dev->name,
1403 port->actor_port_number,
1404 port->slave->dev->name,
1405 port->aggregator->aggregator_identifier);
1406 }
1407 }
1408 /* search on all aggregators for a suitable aggregator for this port */
1409 bond_for_each_slave(bond, slave, iter) {
1410 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1411
1412 /* keep a free aggregator for later use(if needed) */
1413 if (!aggregator->lag_ports) {
1414 if (!free_aggregator)
1415 free_aggregator = aggregator;
1416 continue;
1417 }
1418 /* check if current aggregator suits us */
1419 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1420 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1421 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1422 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1423 ) &&
1424 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1425 !aggregator->is_individual) /* but is not individual OR */
1426 )
1427 ) {
1428 /* attach to the founded aggregator */
1429 port->aggregator = aggregator;
1430 port->actor_port_aggregator_identifier =
1431 port->aggregator->aggregator_identifier;
1432 port->next_port_in_aggregator = aggregator->lag_ports;
1433 port->aggregator->num_of_ports++;
1434 aggregator->lag_ports = port;
1435 netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1436 port->actor_port_number,
1437 port->aggregator->aggregator_identifier);
1438
1439 /* mark this port as selected */
1440 port->sm_vars |= AD_PORT_SELECTED;
1441 found = 1;
1442 break;
1443 }
1444 }
1445
1446 /* the port couldn't find an aggregator - attach it to a new
1447 * aggregator
1448 */
1449 if (!found) {
1450 if (free_aggregator) {
1451 /* assign port a new aggregator */
1452 port->aggregator = free_aggregator;
1453 port->actor_port_aggregator_identifier =
1454 port->aggregator->aggregator_identifier;
1455
1456 /* update the new aggregator's parameters
1457 * if port was responsed from the end-user
1458 */
1459 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1460 /* if port is full duplex */
1461 port->aggregator->is_individual = false;
1462 else
1463 port->aggregator->is_individual = true;
1464
1465 port->aggregator->actor_admin_aggregator_key =
1466 port->actor_admin_port_key;
1467 port->aggregator->actor_oper_aggregator_key =
1468 port->actor_oper_port_key;
1469 port->aggregator->partner_system =
1470 port->partner_oper.system;
1471 port->aggregator->partner_system_priority =
1472 port->partner_oper.system_priority;
1473 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1474 port->aggregator->receive_state = 1;
1475 port->aggregator->transmit_state = 1;
1476 port->aggregator->lag_ports = port;
1477 port->aggregator->num_of_ports++;
1478
1479 /* mark this port as selected */
1480 port->sm_vars |= AD_PORT_SELECTED;
1481
1482 netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1483 port->actor_port_number,
1484 port->aggregator->aggregator_identifier);
1485 } else {
1486 netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1487 port->actor_port_number, port->slave->dev->name);
1488 }
1489 }
1490 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1491 * in all aggregator's ports, else set ready=FALSE in all
1492 * aggregator's ports
1493 */
1494 __set_agg_ports_ready(port->aggregator,
1495 __agg_ports_are_ready(port->aggregator));
1496
1497 aggregator = __get_first_agg(port);
1498 ad_agg_selection_logic(aggregator, update_slave_arr);
1499
1500 if (!port->aggregator->is_active)
1501 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1502}
1503
1504/* Decide if "agg" is a better choice for the new active aggregator that
1505 * the current best, according to the ad_select policy.
1506 */
1507static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1508 struct aggregator *curr)
1509{
1510 /* 0. If no best, select current.
1511 *
1512 * 1. If the current agg is not individual, and the best is
1513 * individual, select current.
1514 *
1515 * 2. If current agg is individual and the best is not, keep best.
1516 *
1517 * 3. Therefore, current and best are both individual or both not
1518 * individual, so:
1519 *
1520 * 3a. If current agg partner replied, and best agg partner did not,
1521 * select current.
1522 *
1523 * 3b. If current agg partner did not reply and best agg partner
1524 * did reply, keep best.
1525 *
1526 * 4. Therefore, current and best both have partner replies or
1527 * both do not, so perform selection policy:
1528 *
1529 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1530 * select by bandwidth.
1531 *
1532 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1533 */
1534 if (!best)
1535 return curr;
1536
1537 if (!curr->is_individual && best->is_individual)
1538 return curr;
1539
1540 if (curr->is_individual && !best->is_individual)
1541 return best;
1542
1543 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1544 return curr;
1545
1546 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1547 return best;
1548
1549 switch (__get_agg_selection_mode(curr->lag_ports)) {
1550 case BOND_AD_COUNT:
1551 if (__agg_active_ports(curr) > __agg_active_ports(best))
1552 return curr;
1553
1554 if (__agg_active_ports(curr) < __agg_active_ports(best))
1555 return best;
1556
1557 /*FALLTHROUGH*/
1558 case BOND_AD_STABLE:
1559 case BOND_AD_BANDWIDTH:
1560 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1561 return curr;
1562
1563 break;
1564
1565 default:
1566 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1567 curr->slave->bond->dev->name,
1568 __get_agg_selection_mode(curr->lag_ports));
1569 break;
1570 }
1571
1572 return best;
1573}
1574
1575static int agg_device_up(const struct aggregator *agg)
1576{
1577 struct port *port = agg->lag_ports;
1578
1579 if (!port)
1580 return 0;
1581
1582 for (port = agg->lag_ports; port;
1583 port = port->next_port_in_aggregator) {
1584 if (netif_running(port->slave->dev) &&
1585 netif_carrier_ok(port->slave->dev))
1586 return 1;
1587 }
1588
1589 return 0;
1590}
1591
1592/**
1593 * ad_agg_selection_logic - select an aggregation group for a team
1594 * @aggregator: the aggregator we're looking at
1595 * @update_slave_arr: Does slave array need update?
1596 *
1597 * It is assumed that only one aggregator may be selected for a team.
1598 *
1599 * The logic of this function is to select the aggregator according to
1600 * the ad_select policy:
1601 *
1602 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1603 * it, and to reselect the active aggregator only if the previous
1604 * aggregator has no more ports related to it.
1605 *
1606 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1607 * bandwidth, and reselect whenever a link state change takes place or the
1608 * set of slaves in the bond changes.
1609 *
1610 * BOND_AD_COUNT: select the aggregator with largest number of ports
1611 * (slaves), and reselect whenever a link state change takes place or the
1612 * set of slaves in the bond changes.
1613 *
1614 * FIXME: this function MUST be called with the first agg in the bond, or
1615 * __get_active_agg() won't work correctly. This function should be better
1616 * called with the bond itself, and retrieve the first agg from it.
1617 */
1618static void ad_agg_selection_logic(struct aggregator *agg,
1619 bool *update_slave_arr)
1620{
1621 struct aggregator *best, *active, *origin;
1622 struct bonding *bond = agg->slave->bond;
1623 struct list_head *iter;
1624 struct slave *slave;
1625 struct port *port;
1626
1627 rcu_read_lock();
1628 origin = agg;
1629 active = __get_active_agg(agg);
1630 best = (active && agg_device_up(active)) ? active : NULL;
1631
1632 bond_for_each_slave_rcu(bond, slave, iter) {
1633 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1634
1635 agg->is_active = 0;
1636
1637 if (__agg_active_ports(agg) && agg_device_up(agg))
1638 best = ad_agg_selection_test(best, agg);
1639 }
1640
1641 if (best &&
1642 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1643 /* For the STABLE policy, don't replace the old active
1644 * aggregator if it's still active (it has an answering
1645 * partner) or if both the best and active don't have an
1646 * answering partner.
1647 */
1648 if (active && active->lag_ports &&
1649 __agg_active_ports(active) &&
1650 (__agg_has_partner(active) ||
1651 (!__agg_has_partner(active) &&
1652 !__agg_has_partner(best)))) {
1653 if (!(!active->actor_oper_aggregator_key &&
1654 best->actor_oper_aggregator_key)) {
1655 best = NULL;
1656 active->is_active = 1;
1657 }
1658 }
1659 }
1660
1661 if (best && (best == active)) {
1662 best = NULL;
1663 active->is_active = 1;
1664 }
1665
1666 /* if there is new best aggregator, activate it */
1667 if (best) {
1668 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1669 best->aggregator_identifier, best->num_of_ports,
1670 best->actor_oper_aggregator_key,
1671 best->partner_oper_aggregator_key,
1672 best->is_individual, best->is_active);
1673 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1674 best->lag_ports, best->slave,
1675 best->slave ? best->slave->dev->name : "NULL");
1676
1677 bond_for_each_slave_rcu(bond, slave, iter) {
1678 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1679
1680 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1681 agg->aggregator_identifier, agg->num_of_ports,
1682 agg->actor_oper_aggregator_key,
1683 agg->partner_oper_aggregator_key,
1684 agg->is_individual, agg->is_active);
1685 }
1686
1687 /* check if any partner replys */
1688 if (best->is_individual) {
1689 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1690 best->slave ?
1691 best->slave->bond->dev->name : "NULL");
1692 }
1693
1694 best->is_active = 1;
1695 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1696 best->aggregator_identifier);
1697 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1698 best->aggregator_identifier, best->num_of_ports,
1699 best->actor_oper_aggregator_key,
1700 best->partner_oper_aggregator_key,
1701 best->is_individual, best->is_active);
1702
1703 /* disable the ports that were related to the former
1704 * active_aggregator
1705 */
1706 if (active) {
1707 for (port = active->lag_ports; port;
1708 port = port->next_port_in_aggregator) {
1709 __disable_port(port);
1710 }
1711 }
1712 /* Slave array needs update. */
1713 *update_slave_arr = true;
1714 }
1715
1716 /* if the selected aggregator is of join individuals
1717 * (partner_system is NULL), enable their ports
1718 */
1719 active = __get_active_agg(origin);
1720
1721 if (active) {
1722 if (!__agg_has_partner(active)) {
1723 for (port = active->lag_ports; port;
1724 port = port->next_port_in_aggregator) {
1725 __enable_port(port);
1726 }
1727 }
1728 }
1729
1730 rcu_read_unlock();
1731
1732 bond_3ad_set_carrier(bond);
1733}
1734
1735/**
1736 * ad_clear_agg - clear a given aggregator's parameters
1737 * @aggregator: the aggregator we're looking at
1738 */
1739static void ad_clear_agg(struct aggregator *aggregator)
1740{
1741 if (aggregator) {
1742 aggregator->is_individual = false;
1743 aggregator->actor_admin_aggregator_key = 0;
1744 aggregator->actor_oper_aggregator_key = 0;
1745 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1746 aggregator->partner_system_priority = 0;
1747 aggregator->partner_oper_aggregator_key = 0;
1748 aggregator->receive_state = 0;
1749 aggregator->transmit_state = 0;
1750 aggregator->lag_ports = NULL;
1751 aggregator->is_active = 0;
1752 aggregator->num_of_ports = 0;
1753 pr_debug("LAG %d was cleared\n",
1754 aggregator->aggregator_identifier);
1755 }
1756}
1757
1758/**
1759 * ad_initialize_agg - initialize a given aggregator's parameters
1760 * @aggregator: the aggregator we're looking at
1761 */
1762static void ad_initialize_agg(struct aggregator *aggregator)
1763{
1764 if (aggregator) {
1765 ad_clear_agg(aggregator);
1766
1767 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1768 aggregator->aggregator_identifier = 0;
1769 aggregator->slave = NULL;
1770 }
1771}
1772
1773/**
1774 * ad_initialize_port - initialize a given port's parameters
1775 * @aggregator: the aggregator we're looking at
1776 * @lacp_fast: boolean. whether fast periodic should be used
1777 */
1778static void ad_initialize_port(struct port *port, int lacp_fast)
1779{
1780 static const struct port_params tmpl = {
1781 .system_priority = 0xffff,
1782 .key = 1,
1783 .port_number = 1,
1784 .port_priority = 0xff,
1785 .port_state = 1,
1786 };
1787 static const struct lacpdu lacpdu = {
1788 .subtype = 0x01,
1789 .version_number = 0x01,
1790 .tlv_type_actor_info = 0x01,
1791 .actor_information_length = 0x14,
1792 .tlv_type_partner_info = 0x02,
1793 .partner_information_length = 0x14,
1794 .tlv_type_collector_info = 0x03,
1795 .collector_information_length = 0x10,
1796 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1797 };
1798
1799 if (port) {
1800 port->actor_port_priority = 0xff;
1801 port->actor_port_aggregator_identifier = 0;
1802 port->ntt = false;
1803 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1804 AD_STATE_LACP_ACTIVITY;
1805 port->actor_oper_port_state = AD_STATE_AGGREGATION |
1806 AD_STATE_LACP_ACTIVITY;
1807
1808 if (lacp_fast)
1809 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1810
1811 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1812 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1813
1814 port->is_enabled = true;
1815 /* private parameters */
1816 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1817 port->sm_rx_state = 0;
1818 port->sm_rx_timer_counter = 0;
1819 port->sm_periodic_state = 0;
1820 port->sm_periodic_timer_counter = 0;
1821 port->sm_mux_state = 0;
1822 port->sm_mux_timer_counter = 0;
1823 port->sm_tx_state = 0;
1824 port->aggregator = NULL;
1825 port->next_port_in_aggregator = NULL;
1826 port->transaction_id = 0;
1827
1828 port->sm_churn_actor_timer_counter = 0;
1829 port->sm_churn_actor_state = 0;
1830 port->churn_actor_count = 0;
1831 port->sm_churn_partner_timer_counter = 0;
1832 port->sm_churn_partner_state = 0;
1833 port->churn_partner_count = 0;
1834
1835 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1836 }
1837}
1838
1839/**
1840 * ad_enable_collecting_distributing - enable a port's transmit/receive
1841 * @port: the port we're looking at
1842 * @update_slave_arr: Does slave array need update?
1843 *
1844 * Enable @port if it's in an active aggregator
1845 */
1846static void ad_enable_collecting_distributing(struct port *port,
1847 bool *update_slave_arr)
1848{
1849 if (port->aggregator->is_active) {
1850 pr_debug("Enabling port %d(LAG %d)\n",
1851 port->actor_port_number,
1852 port->aggregator->aggregator_identifier);
1853 __enable_port(port);
1854 /* Slave array needs update */
1855 *update_slave_arr = true;
1856 }
1857}
1858
1859/**
1860 * ad_disable_collecting_distributing - disable a port's transmit/receive
1861 * @port: the port we're looking at
1862 * @update_slave_arr: Does slave array need update?
1863 */
1864static void ad_disable_collecting_distributing(struct port *port,
1865 bool *update_slave_arr)
1866{
1867 if (port->aggregator &&
1868 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1869 &(null_mac_addr))) {
1870 pr_debug("Disabling port %d(LAG %d)\n",
1871 port->actor_port_number,
1872 port->aggregator->aggregator_identifier);
1873 __disable_port(port);
1874 /* Slave array needs an update */
1875 *update_slave_arr = true;
1876 }
1877}
1878
1879/**
1880 * ad_marker_info_received - handle receive of a Marker information frame
1881 * @marker_info: Marker info received
1882 * @port: the port we're looking at
1883 */
1884static void ad_marker_info_received(struct bond_marker *marker_info,
1885 struct port *port)
1886{
1887 struct bond_marker marker;
1888
1889 /* copy the received marker data to the response marker */
1890 memcpy(&marker, marker_info, sizeof(struct bond_marker));
1891 /* change the marker subtype to marker response */
1892 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1893
1894 /* send the marker response */
1895 if (ad_marker_send(port, &marker) >= 0) {
1896 pr_debug("Sent Marker Response on port %d\n",
1897 port->actor_port_number);
1898 }
1899}
1900
1901/**
1902 * ad_marker_response_received - handle receive of a marker response frame
1903 * @marker: marker PDU received
1904 * @port: the port we're looking at
1905 *
1906 * This function does nothing since we decided not to implement send and handle
1907 * response for marker PDU's, in this stage, but only to respond to marker
1908 * information.
1909 */
1910static void ad_marker_response_received(struct bond_marker *marker,
1911 struct port *port)
1912{
1913 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1914}
1915
1916/* ========= AD exported functions to the main bonding code ========= */
1917
1918/* Check aggregators status in team every T seconds */
1919#define AD_AGGREGATOR_SELECTION_TIMER 8
1920
1921/**
1922 * bond_3ad_initiate_agg_selection - initate aggregator selection
1923 * @bond: bonding struct
1924 *
1925 * Set the aggregation selection timer, to initiate an agg selection in
1926 * the very near future. Called during first initialization, and during
1927 * any down to up transitions of the bond.
1928 */
1929void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1930{
1931 BOND_AD_INFO(bond).agg_select_timer = timeout;
1932}
1933
1934/**
1935 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1936 * @bond: bonding struct to work on
1937 * @tick_resolution: tick duration (millisecond resolution)
1938 *
1939 * Can be called only after the mac address of the bond is set.
1940 */
1941void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1942{
1943 /* check that the bond is not initialized yet */
1944 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1945 bond->dev->dev_addr)) {
1946
1947 BOND_AD_INFO(bond).aggregator_identifier = 0;
1948
1949 BOND_AD_INFO(bond).system.sys_priority =
1950 bond->params.ad_actor_sys_prio;
1951 if (is_zero_ether_addr(bond->params.ad_actor_system))
1952 BOND_AD_INFO(bond).system.sys_mac_addr =
1953 *((struct mac_addr *)bond->dev->dev_addr);
1954 else
1955 BOND_AD_INFO(bond).system.sys_mac_addr =
1956 *((struct mac_addr *)bond->params.ad_actor_system);
1957
1958 /* initialize how many times this module is called in one
1959 * second (should be about every 100ms)
1960 */
1961 ad_ticks_per_sec = tick_resolution;
1962
1963 bond_3ad_initiate_agg_selection(bond,
1964 AD_AGGREGATOR_SELECTION_TIMER *
1965 ad_ticks_per_sec);
1966 }
1967}
1968
1969/**
1970 * bond_3ad_bind_slave - initialize a slave's port
1971 * @slave: slave struct to work on
1972 *
1973 * Returns: 0 on success
1974 * < 0 on error
1975 */
1976void bond_3ad_bind_slave(struct slave *slave)
1977{
1978 struct bonding *bond = bond_get_bond_by_slave(slave);
1979 struct port *port;
1980 struct aggregator *aggregator;
1981
1982 /* check that the slave has not been initialized yet. */
1983 if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1984
1985 /* port initialization */
1986 port = &(SLAVE_AD_INFO(slave)->port);
1987
1988 ad_initialize_port(port, bond->params.lacp_fast);
1989
1990 port->slave = slave;
1991 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
1992 /* key is determined according to the link speed, duplex and
1993 * user key
1994 */
1995 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
1996 ad_update_actor_keys(port, false);
1997 /* actor system is the bond's system */
1998 __ad_actor_update_port(port);
1999 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2000 * lacpdu's are sent in one second)
2001 */
2002 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2003
2004 __disable_port(port);
2005
2006 /* aggregator initialization */
2007 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2008
2009 ad_initialize_agg(aggregator);
2010
2011 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2012 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2013 aggregator->slave = slave;
2014 aggregator->is_active = 0;
2015 aggregator->num_of_ports = 0;
2016 }
2017}
2018
2019/**
2020 * bond_3ad_unbind_slave - deinitialize a slave's port
2021 * @slave: slave struct to work on
2022 *
2023 * Search for the aggregator that is related to this port, remove the
2024 * aggregator and assign another aggregator for other port related to it
2025 * (if any), and remove the port.
2026 */
2027void bond_3ad_unbind_slave(struct slave *slave)
2028{
2029 struct port *port, *prev_port, *temp_port;
2030 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2031 int select_new_active_agg = 0;
2032 struct bonding *bond = slave->bond;
2033 struct slave *slave_iter;
2034 struct list_head *iter;
2035 bool dummy_slave_update; /* Ignore this value as caller updates array */
2036
2037 /* Sync against bond_3ad_state_machine_handler() */
2038 spin_lock_bh(&bond->mode_lock);
2039 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2040 port = &(SLAVE_AD_INFO(slave)->port);
2041
2042 /* if slave is null, the whole port is not initialized */
2043 if (!port->slave) {
2044 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
2045 slave->dev->name);
2046 goto out;
2047 }
2048
2049 netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
2050 aggregator->aggregator_identifier);
2051
2052 /* Tell the partner that this port is not suitable for aggregation */
2053 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2054 __update_lacpdu_from_port(port);
2055 ad_lacpdu_send(port);
2056
2057 /* check if this aggregator is occupied */
2058 if (aggregator->lag_ports) {
2059 /* check if there are other ports related to this aggregator
2060 * except the port related to this slave(thats ensure us that
2061 * there is a reason to search for new aggregator, and that we
2062 * will find one
2063 */
2064 if ((aggregator->lag_ports != port) ||
2065 (aggregator->lag_ports->next_port_in_aggregator)) {
2066 /* find new aggregator for the related port(s) */
2067 bond_for_each_slave(bond, slave_iter, iter) {
2068 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2069 /* if the new aggregator is empty, or it is
2070 * connected to our port only
2071 */
2072 if (!new_aggregator->lag_ports ||
2073 ((new_aggregator->lag_ports == port) &&
2074 !new_aggregator->lag_ports->next_port_in_aggregator))
2075 break;
2076 }
2077 if (!slave_iter)
2078 new_aggregator = NULL;
2079
2080 /* if new aggregator found, copy the aggregator's
2081 * parameters and connect the related lag_ports to the
2082 * new aggregator
2083 */
2084 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2085 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2086 aggregator->aggregator_identifier,
2087 new_aggregator->aggregator_identifier);
2088
2089 if ((new_aggregator->lag_ports == port) &&
2090 new_aggregator->is_active) {
2091 netdev_info(bond->dev, "Removing an active aggregator\n");
2092 select_new_active_agg = 1;
2093 }
2094
2095 new_aggregator->is_individual = aggregator->is_individual;
2096 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2097 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2098 new_aggregator->partner_system = aggregator->partner_system;
2099 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2100 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2101 new_aggregator->receive_state = aggregator->receive_state;
2102 new_aggregator->transmit_state = aggregator->transmit_state;
2103 new_aggregator->lag_ports = aggregator->lag_ports;
2104 new_aggregator->is_active = aggregator->is_active;
2105 new_aggregator->num_of_ports = aggregator->num_of_ports;
2106
2107 /* update the information that is written on
2108 * the ports about the aggregator
2109 */
2110 for (temp_port = aggregator->lag_ports; temp_port;
2111 temp_port = temp_port->next_port_in_aggregator) {
2112 temp_port->aggregator = new_aggregator;
2113 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2114 }
2115
2116 ad_clear_agg(aggregator);
2117
2118 if (select_new_active_agg)
2119 ad_agg_selection_logic(__get_first_agg(port),
2120 &dummy_slave_update);
2121 } else {
2122 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2123 }
2124 } else {
2125 /* in case that the only port related to this
2126 * aggregator is the one we want to remove
2127 */
2128 select_new_active_agg = aggregator->is_active;
2129 ad_clear_agg(aggregator);
2130 if (select_new_active_agg) {
2131 netdev_info(bond->dev, "Removing an active aggregator\n");
2132 /* select new active aggregator */
2133 temp_aggregator = __get_first_agg(port);
2134 if (temp_aggregator)
2135 ad_agg_selection_logic(temp_aggregator,
2136 &dummy_slave_update);
2137 }
2138 }
2139 }
2140
2141 netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
2142
2143 /* find the aggregator that this port is connected to */
2144 bond_for_each_slave(bond, slave_iter, iter) {
2145 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2146 prev_port = NULL;
2147 /* search the port in the aggregator's related ports */
2148 for (temp_port = temp_aggregator->lag_ports; temp_port;
2149 prev_port = temp_port,
2150 temp_port = temp_port->next_port_in_aggregator) {
2151 if (temp_port == port) {
2152 /* the aggregator found - detach the port from
2153 * this aggregator
2154 */
2155 if (prev_port)
2156 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2157 else
2158 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2159 temp_aggregator->num_of_ports--;
2160 if (__agg_active_ports(temp_aggregator) == 0) {
2161 select_new_active_agg = temp_aggregator->is_active;
2162 ad_clear_agg(temp_aggregator);
2163 if (select_new_active_agg) {
2164 netdev_info(bond->dev, "Removing an active aggregator\n");
2165 /* select new active aggregator */
2166 ad_agg_selection_logic(__get_first_agg(port),
2167 &dummy_slave_update);
2168 }
2169 }
2170 break;
2171 }
2172 }
2173 }
2174 port->slave = NULL;
2175
2176out:
2177 spin_unlock_bh(&bond->mode_lock);
2178}
2179
2180/**
2181 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2182 * @bond: bonding struct to work on
2183 *
2184 * If an ad_actor setting gets changed we need to update the individual port
2185 * settings so the bond device will use the new values when it gets upped.
2186 */
2187void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2188{
2189 struct list_head *iter;
2190 struct slave *slave;
2191
2192 ASSERT_RTNL();
2193
2194 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2195 if (is_zero_ether_addr(bond->params.ad_actor_system))
2196 BOND_AD_INFO(bond).system.sys_mac_addr =
2197 *((struct mac_addr *)bond->dev->dev_addr);
2198 else
2199 BOND_AD_INFO(bond).system.sys_mac_addr =
2200 *((struct mac_addr *)bond->params.ad_actor_system);
2201
2202 spin_lock_bh(&bond->mode_lock);
2203 bond_for_each_slave(bond, slave, iter) {
2204 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2205
2206 __ad_actor_update_port(port);
2207 port->ntt = true;
2208 }
2209 spin_unlock_bh(&bond->mode_lock);
2210}
2211
2212/**
2213 * bond_3ad_state_machine_handler - handle state machines timeout
2214 * @bond: bonding struct to work on
2215 *
2216 * The state machine handling concept in this module is to check every tick
2217 * which state machine should operate any function. The execution order is
2218 * round robin, so when we have an interaction between state machines, the
2219 * reply of one to each other might be delayed until next tick.
2220 *
2221 * This function also complete the initialization when the agg_select_timer
2222 * times out, and it selects an aggregator for the ports that are yet not
2223 * related to any aggregator, and selects the active aggregator for a bond.
2224 */
2225void bond_3ad_state_machine_handler(struct work_struct *work)
2226{
2227 struct bonding *bond = container_of(work, struct bonding,
2228 ad_work.work);
2229 struct aggregator *aggregator;
2230 struct list_head *iter;
2231 struct slave *slave;
2232 struct port *port;
2233 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2234 bool update_slave_arr = false;
2235
2236 /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2237 * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2238 * concurrently due to incoming LACPDU as well.
2239 */
2240 spin_lock_bh(&bond->mode_lock);
2241 rcu_read_lock();
2242
2243 /* check if there are any slaves */
2244 if (!bond_has_slaves(bond))
2245 goto re_arm;
2246
2247 /* check if agg_select_timer timer after initialize is timed out */
2248 if (BOND_AD_INFO(bond).agg_select_timer &&
2249 !(--BOND_AD_INFO(bond).agg_select_timer)) {
2250 slave = bond_first_slave_rcu(bond);
2251 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2252
2253 /* select the active aggregator for the bond */
2254 if (port) {
2255 if (!port->slave) {
2256 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2257 bond->dev->name);
2258 goto re_arm;
2259 }
2260
2261 aggregator = __get_first_agg(port);
2262 ad_agg_selection_logic(aggregator, &update_slave_arr);
2263 }
2264 bond_3ad_set_carrier(bond);
2265 }
2266
2267 /* for each port run the state machines */
2268 bond_for_each_slave_rcu(bond, slave, iter) {
2269 port = &(SLAVE_AD_INFO(slave)->port);
2270 if (!port->slave) {
2271 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2272 bond->dev->name);
2273 goto re_arm;
2274 }
2275
2276 ad_rx_machine(NULL, port);
2277 ad_periodic_machine(port);
2278 ad_port_selection_logic(port, &update_slave_arr);
2279 ad_mux_machine(port, &update_slave_arr);
2280 ad_tx_machine(port);
2281 ad_churn_machine(port);
2282
2283 /* turn off the BEGIN bit, since we already handled it */
2284 if (port->sm_vars & AD_PORT_BEGIN)
2285 port->sm_vars &= ~AD_PORT_BEGIN;
2286 }
2287
2288re_arm:
2289 bond_for_each_slave_rcu(bond, slave, iter) {
2290 if (slave->should_notify) {
2291 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2292 break;
2293 }
2294 }
2295 rcu_read_unlock();
2296 spin_unlock_bh(&bond->mode_lock);
2297
2298 if (update_slave_arr)
2299 bond_slave_arr_work_rearm(bond, 0);
2300
2301 if (should_notify_rtnl && rtnl_trylock()) {
2302 bond_slave_state_notify(bond);
2303 rtnl_unlock();
2304 }
2305 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2306}
2307
2308/**
2309 * bond_3ad_rx_indication - handle a received frame
2310 * @lacpdu: received lacpdu
2311 * @slave: slave struct to work on
2312 * @length: length of the data received
2313 *
2314 * It is assumed that frames that were sent on this NIC don't returned as new
2315 * received frames (loopback). Since only the payload is given to this
2316 * function, it check for loopback.
2317 */
2318static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2319 u16 length)
2320{
2321 struct port *port;
2322 int ret = RX_HANDLER_ANOTHER;
2323
2324 if (length >= sizeof(struct lacpdu)) {
2325
2326 port = &(SLAVE_AD_INFO(slave)->port);
2327
2328 if (!port->slave) {
2329 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2330 slave->dev->name, slave->bond->dev->name);
2331 return ret;
2332 }
2333
2334 switch (lacpdu->subtype) {
2335 case AD_TYPE_LACPDU:
2336 ret = RX_HANDLER_CONSUMED;
2337 netdev_dbg(slave->bond->dev,
2338 "Received LACPDU on port %d slave %s\n",
2339 port->actor_port_number,
2340 slave->dev->name);
2341 /* Protect against concurrent state machines */
2342 spin_lock(&slave->bond->mode_lock);
2343 ad_rx_machine(lacpdu, port);
2344 spin_unlock(&slave->bond->mode_lock);
2345 break;
2346
2347 case AD_TYPE_MARKER:
2348 ret = RX_HANDLER_CONSUMED;
2349 /* No need to convert fields to Little Endian since we
2350 * don't use the marker's fields.
2351 */
2352
2353 switch (((struct bond_marker *)lacpdu)->tlv_type) {
2354 case AD_MARKER_INFORMATION_SUBTYPE:
2355 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2356 port->actor_port_number);
2357 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2358 break;
2359
2360 case AD_MARKER_RESPONSE_SUBTYPE:
2361 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2362 port->actor_port_number);
2363 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2364 break;
2365
2366 default:
2367 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2368 port->actor_port_number);
2369 }
2370 }
2371 }
2372 return ret;
2373}
2374
2375/**
2376 * ad_update_actor_keys - Update the oper / admin keys for a port based on
2377 * its current speed and duplex settings.
2378 *
2379 * @port: the port we'are looking at
2380 * @reset: Boolean to just reset the speed and the duplex part of the key
2381 *
2382 * The logic to change the oper / admin keys is:
2383 * (a) A full duplex port can participate in LACP with partner.
2384 * (b) When the speed is changed, LACP need to be reinitiated.
2385 */
2386static void ad_update_actor_keys(struct port *port, bool reset)
2387{
2388 u8 duplex = 0;
2389 u16 ospeed = 0, speed = 0;
2390 u16 old_oper_key = port->actor_oper_port_key;
2391
2392 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2393 if (!reset) {
2394 speed = __get_link_speed(port);
2395 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2396 duplex = __get_duplex(port);
2397 port->actor_admin_port_key |= (speed << 1) | duplex;
2398 }
2399 port->actor_oper_port_key = port->actor_admin_port_key;
2400
2401 if (old_oper_key != port->actor_oper_port_key) {
2402 /* Only 'duplex' port participates in LACP */
2403 if (duplex)
2404 port->sm_vars |= AD_PORT_LACP_ENABLED;
2405 else
2406 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2407
2408 if (!reset) {
2409 if (!speed) {
2410 netdev_err(port->slave->dev,
2411 "speed changed to 0 for port %s",
2412 port->slave->dev->name);
2413 } else if (duplex && ospeed != speed) {
2414 /* Speed change restarts LACP state-machine */
2415 port->sm_vars |= AD_PORT_BEGIN;
2416 }
2417 }
2418 }
2419}
2420
2421/**
2422 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2423 * change indication
2424 *
2425 * @slave: slave struct to work on
2426 *
2427 * Handle reselection of aggregator (if needed) for this port.
2428 */
2429void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2430{
2431 struct port *port;
2432
2433 port = &(SLAVE_AD_INFO(slave)->port);
2434
2435 /* if slave is null, the whole port is not initialized */
2436 if (!port->slave) {
2437 netdev_warn(slave->bond->dev,
2438 "speed/duplex changed for uninitialized port %s\n",
2439 slave->dev->name);
2440 return;
2441 }
2442
2443 spin_lock_bh(&slave->bond->mode_lock);
2444 ad_update_actor_keys(port, false);
2445 netdev_dbg(slave->bond->dev, "Port %d slave %s changed speed/duplex\n",
2446 port->actor_port_number, slave->dev->name);
2447 spin_unlock_bh(&slave->bond->mode_lock);
2448}
2449
2450/**
2451 * bond_3ad_handle_link_change - handle a slave's link status change indication
2452 * @slave: slave struct to work on
2453 * @status: whether the link is now up or down
2454 *
2455 * Handle reselection of aggregator (if needed) for this port.
2456 */
2457void bond_3ad_handle_link_change(struct slave *slave, char link)
2458{
2459 struct aggregator *agg;
2460 struct port *port;
2461 bool dummy;
2462
2463 port = &(SLAVE_AD_INFO(slave)->port);
2464
2465 /* if slave is null, the whole port is not initialized */
2466 if (!port->slave) {
2467 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2468 slave->dev->name);
2469 return;
2470 }
2471
2472 spin_lock_bh(&slave->bond->mode_lock);
2473 /* on link down we are zeroing duplex and speed since
2474 * some of the adaptors(ce1000.lan) report full duplex/speed
2475 * instead of N/A(duplex) / 0(speed).
2476 *
2477 * on link up we are forcing recheck on the duplex and speed since
2478 * some of he adaptors(ce1000.lan) report.
2479 */
2480 if (link == BOND_LINK_UP) {
2481 port->is_enabled = true;
2482 ad_update_actor_keys(port, false);
2483 } else {
2484 /* link has failed */
2485 port->is_enabled = false;
2486 ad_update_actor_keys(port, true);
2487 }
2488 agg = __get_first_agg(port);
2489 ad_agg_selection_logic(agg, &dummy);
2490
2491 netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2492 port->actor_port_number,
2493 link == BOND_LINK_UP ? "UP" : "DOWN");
2494
2495 spin_unlock_bh(&slave->bond->mode_lock);
2496
2497 /* RTNL is held and mode_lock is released so it's safe
2498 * to update slave_array here.
2499 */
2500 bond_update_slave_arr(slave->bond, NULL);
2501}
2502
2503/**
2504 * bond_3ad_set_carrier - set link state for bonding master
2505 * @bond - bonding structure
2506 *
2507 * if we have an active aggregator, we're up, if not, we're down.
2508 * Presumes that we cannot have an active aggregator if there are
2509 * no slaves with link up.
2510 *
2511 * This behavior complies with IEEE 802.3 section 43.3.9.
2512 *
2513 * Called by bond_set_carrier(). Return zero if carrier state does not
2514 * change, nonzero if it does.
2515 */
2516int bond_3ad_set_carrier(struct bonding *bond)
2517{
2518 struct aggregator *active;
2519 struct slave *first_slave;
2520 int ret = 1;
2521
2522 rcu_read_lock();
2523 first_slave = bond_first_slave_rcu(bond);
2524 if (!first_slave) {
2525 ret = 0;
2526 goto out;
2527 }
2528 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2529 if (active) {
2530 /* are enough slaves available to consider link up? */
2531 if (__agg_active_ports(active) < bond->params.min_links) {
2532 if (netif_carrier_ok(bond->dev)) {
2533 netif_carrier_off(bond->dev);
2534 goto out;
2535 }
2536 } else if (!netif_carrier_ok(bond->dev)) {
2537 netif_carrier_on(bond->dev);
2538 goto out;
2539 }
2540 } else if (netif_carrier_ok(bond->dev)) {
2541 netif_carrier_off(bond->dev);
2542 }
2543out:
2544 rcu_read_unlock();
2545 return ret;
2546}
2547
2548/**
2549 * __bond_3ad_get_active_agg_info - get information of the active aggregator
2550 * @bond: bonding struct to work on
2551 * @ad_info: ad_info struct to fill with the bond's info
2552 *
2553 * Returns: 0 on success
2554 * < 0 on error
2555 */
2556int __bond_3ad_get_active_agg_info(struct bonding *bond,
2557 struct ad_info *ad_info)
2558{
2559 struct aggregator *aggregator = NULL;
2560 struct list_head *iter;
2561 struct slave *slave;
2562 struct port *port;
2563
2564 bond_for_each_slave_rcu(bond, slave, iter) {
2565 port = &(SLAVE_AD_INFO(slave)->port);
2566 if (port->aggregator && port->aggregator->is_active) {
2567 aggregator = port->aggregator;
2568 break;
2569 }
2570 }
2571
2572 if (!aggregator)
2573 return -1;
2574
2575 ad_info->aggregator_id = aggregator->aggregator_identifier;
2576 ad_info->ports = aggregator->num_of_ports;
2577 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2578 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2579 ether_addr_copy(ad_info->partner_system,
2580 aggregator->partner_system.mac_addr_value);
2581 return 0;
2582}
2583
2584int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2585{
2586 int ret;
2587
2588 rcu_read_lock();
2589 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2590 rcu_read_unlock();
2591
2592 return ret;
2593}
2594
2595int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2596 struct slave *slave)
2597{
2598 struct lacpdu *lacpdu, _lacpdu;
2599
2600 if (skb->protocol != PKT_TYPE_LACPDU)
2601 return RX_HANDLER_ANOTHER;
2602
2603 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2604 return RX_HANDLER_ANOTHER;
2605
2606 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2607 if (!lacpdu)
2608 return RX_HANDLER_ANOTHER;
2609
2610 return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2611}
2612
2613/**
2614 * bond_3ad_update_lacp_rate - change the lacp rate
2615 * @bond - bonding struct
2616 *
2617 * When modify lacp_rate parameter via sysfs,
2618 * update actor_oper_port_state of each port.
2619 *
2620 * Hold bond->mode_lock,
2621 * so we can modify port->actor_oper_port_state,
2622 * no matter bond is up or down.
2623 */
2624void bond_3ad_update_lacp_rate(struct bonding *bond)
2625{
2626 struct port *port = NULL;
2627 struct list_head *iter;
2628 struct slave *slave;
2629 int lacp_fast;
2630
2631 lacp_fast = bond->params.lacp_fast;
2632 spin_lock_bh(&bond->mode_lock);
2633 bond_for_each_slave(bond, slave, iter) {
2634 port = &(SLAVE_AD_INFO(slave)->port);
2635 if (lacp_fast)
2636 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2637 else
2638 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2639 }
2640 spin_unlock_bh(&bond->mode_lock);
2641}