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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
4 */
5
6#include <linux/skbuff.h>
7#include <linux/if_ether.h>
8#include <linux/netdevice.h>
9#include <linux/spinlock.h>
10#include <linux/ethtool.h>
11#include <linux/etherdevice.h>
12#include <linux/if_bonding.h>
13#include <linux/pkt_sched.h>
14#include <net/net_namespace.h>
15#include <net/bonding.h>
16#include <net/bond_3ad.h>
17#include <net/netlink.h>
18
19/* General definitions */
20#define AD_SHORT_TIMEOUT 1
21#define AD_LONG_TIMEOUT 0
22#define AD_STANDBY 0x2
23#define AD_MAX_TX_IN_SECOND 3
24#define AD_COLLECTOR_MAX_DELAY 0
25
26/* Timer definitions (43.4.4 in the 802.3ad standard) */
27#define AD_FAST_PERIODIC_TIME 1
28#define AD_SLOW_PERIODIC_TIME 30
29#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
30#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
31#define AD_CHURN_DETECTION_TIME 60
32#define AD_AGGREGATE_WAIT_TIME 2
33
34/* Port Variables definitions used by the State Machines (43.4.7 in the
35 * 802.3ad standard)
36 */
37#define AD_PORT_BEGIN 0x1
38#define AD_PORT_LACP_ENABLED 0x2
39#define AD_PORT_ACTOR_CHURN 0x4
40#define AD_PORT_PARTNER_CHURN 0x8
41#define AD_PORT_READY 0x10
42#define AD_PORT_READY_N 0x20
43#define AD_PORT_MATCHED 0x40
44#define AD_PORT_STANDBY 0x80
45#define AD_PORT_SELECTED 0x100
46#define AD_PORT_MOVED 0x200
47#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
48
49/* Port Key definitions
50 * key is determined according to the link speed, duplex and
51 * user key (which is yet not supported)
52 * --------------------------------------------------------------
53 * Port key | User key (10 bits) | Speed (5 bits) | Duplex|
54 * --------------------------------------------------------------
55 * |15 6|5 1|0
56 */
57#define AD_DUPLEX_KEY_MASKS 0x1
58#define AD_SPEED_KEY_MASKS 0x3E
59#define AD_USER_KEY_MASKS 0xFFC0
60
61enum ad_link_speed_type {
62 AD_LINK_SPEED_1MBPS = 1,
63 AD_LINK_SPEED_10MBPS,
64 AD_LINK_SPEED_100MBPS,
65 AD_LINK_SPEED_1000MBPS,
66 AD_LINK_SPEED_2500MBPS,
67 AD_LINK_SPEED_5000MBPS,
68 AD_LINK_SPEED_10000MBPS,
69 AD_LINK_SPEED_14000MBPS,
70 AD_LINK_SPEED_20000MBPS,
71 AD_LINK_SPEED_25000MBPS,
72 AD_LINK_SPEED_40000MBPS,
73 AD_LINK_SPEED_50000MBPS,
74 AD_LINK_SPEED_56000MBPS,
75 AD_LINK_SPEED_100000MBPS,
76 AD_LINK_SPEED_200000MBPS,
77 AD_LINK_SPEED_400000MBPS,
78 AD_LINK_SPEED_800000MBPS,
79};
80
81/* compare MAC addresses */
82#define MAC_ADDRESS_EQUAL(A, B) \
83 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
84
85static const u16 ad_ticks_per_sec = 1000 / AD_TIMER_INTERVAL;
86static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
87
88const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned = {
89 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02
90};
91
92/* ================= main 802.3ad protocol functions ================== */
93static int ad_lacpdu_send(struct port *port);
94static int ad_marker_send(struct port *port, struct bond_marker *marker);
95static void ad_mux_machine(struct port *port, bool *update_slave_arr);
96static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
97static void ad_tx_machine(struct port *port);
98static void ad_periodic_machine(struct port *port, struct bond_params *bond_params);
99static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
100static void ad_agg_selection_logic(struct aggregator *aggregator,
101 bool *update_slave_arr);
102static void ad_clear_agg(struct aggregator *aggregator);
103static void ad_initialize_agg(struct aggregator *aggregator);
104static void ad_initialize_port(struct port *port, int lacp_fast);
105static void ad_enable_collecting(struct port *port);
106static void ad_disable_distributing(struct port *port,
107 bool *update_slave_arr);
108static void ad_enable_collecting_distributing(struct port *port,
109 bool *update_slave_arr);
110static void ad_disable_collecting_distributing(struct port *port,
111 bool *update_slave_arr);
112static void ad_marker_info_received(struct bond_marker *marker_info,
113 struct port *port);
114static void ad_marker_response_received(struct bond_marker *marker,
115 struct port *port);
116static void ad_update_actor_keys(struct port *port, bool reset);
117
118
119/* ================= api to bonding and kernel code ================== */
120
121/**
122 * __get_bond_by_port - get the port's bonding struct
123 * @port: the port we're looking at
124 *
125 * Return @port's bonding struct, or %NULL if it can't be found.
126 */
127static inline struct bonding *__get_bond_by_port(struct port *port)
128{
129 if (port->slave == NULL)
130 return NULL;
131
132 return bond_get_bond_by_slave(port->slave);
133}
134
135/**
136 * __get_first_agg - get the first aggregator in the bond
137 * @port: the port we're looking at
138 *
139 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
140 * found.
141 * The caller must hold RCU or RTNL lock.
142 */
143static inline struct aggregator *__get_first_agg(struct port *port)
144{
145 struct bonding *bond = __get_bond_by_port(port);
146 struct slave *first_slave;
147 struct aggregator *agg;
148
149 /* If there's no bond for this port, or bond has no slaves */
150 if (bond == NULL)
151 return NULL;
152
153 rcu_read_lock();
154 first_slave = bond_first_slave_rcu(bond);
155 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
156 rcu_read_unlock();
157
158 return agg;
159}
160
161/**
162 * __agg_has_partner - see if we have a partner
163 * @agg: the agregator we're looking at
164 *
165 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
166 * address for the partner). Return 0 if not.
167 */
168static inline int __agg_has_partner(struct aggregator *agg)
169{
170 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
171}
172
173/**
174 * __disable_distributing_port - disable the port's slave for distributing.
175 * Port will still be able to collect.
176 * @port: the port we're looking at
177 *
178 * This will disable only distributing on the port's slave.
179 */
180static void __disable_distributing_port(struct port *port)
181{
182 bond_set_slave_tx_disabled_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
183}
184
185/**
186 * __enable_collecting_port - enable the port's slave for collecting,
187 * if it's up
188 * @port: the port we're looking at
189 *
190 * This will enable only collecting on the port's slave.
191 */
192static void __enable_collecting_port(struct port *port)
193{
194 struct slave *slave = port->slave;
195
196 if (slave->link == BOND_LINK_UP && bond_slave_is_up(slave))
197 bond_set_slave_rx_enabled_flags(slave, BOND_SLAVE_NOTIFY_LATER);
198}
199
200/**
201 * __disable_port - disable the port's slave
202 * @port: the port we're looking at
203 *
204 * This will disable both collecting and distributing on the port's slave.
205 */
206static inline void __disable_port(struct port *port)
207{
208 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
209}
210
211/**
212 * __enable_port - enable the port's slave, if it's up
213 * @port: the port we're looking at
214 *
215 * This will enable both collecting and distributing on the port's slave.
216 */
217static inline void __enable_port(struct port *port)
218{
219 struct slave *slave = port->slave;
220
221 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
222 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
223}
224
225/**
226 * __port_move_to_attached_state - check if port should transition back to attached
227 * state.
228 * @port: the port we're looking at
229 */
230static bool __port_move_to_attached_state(struct port *port)
231{
232 if (!(port->sm_vars & AD_PORT_SELECTED) ||
233 (port->sm_vars & AD_PORT_STANDBY) ||
234 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
235 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION))
236 port->sm_mux_state = AD_MUX_ATTACHED;
237
238 return port->sm_mux_state == AD_MUX_ATTACHED;
239}
240
241/**
242 * __port_is_collecting_distributing - check if the port's slave is in the
243 * combined collecting/distributing state
244 * @port: the port we're looking at
245 */
246static int __port_is_collecting_distributing(struct port *port)
247{
248 return bond_is_active_slave(port->slave);
249}
250
251/**
252 * __get_agg_selection_mode - get the aggregator selection mode
253 * @port: the port we're looking at
254 *
255 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
256 */
257static inline u32 __get_agg_selection_mode(struct port *port)
258{
259 struct bonding *bond = __get_bond_by_port(port);
260
261 if (bond == NULL)
262 return BOND_AD_STABLE;
263
264 return bond->params.ad_select;
265}
266
267/**
268 * __check_agg_selection_timer - check if the selection timer has expired
269 * @port: the port we're looking at
270 */
271static inline int __check_agg_selection_timer(struct port *port)
272{
273 struct bonding *bond = __get_bond_by_port(port);
274
275 if (bond == NULL)
276 return 0;
277
278 return atomic_read(&BOND_AD_INFO(bond).agg_select_timer) ? 1 : 0;
279}
280
281/**
282 * __get_link_speed - get a port's speed
283 * @port: the port we're looking at
284 *
285 * Return @port's speed in 802.3ad enum format. i.e. one of:
286 * 0,
287 * %AD_LINK_SPEED_10MBPS,
288 * %AD_LINK_SPEED_100MBPS,
289 * %AD_LINK_SPEED_1000MBPS,
290 * %AD_LINK_SPEED_2500MBPS,
291 * %AD_LINK_SPEED_5000MBPS,
292 * %AD_LINK_SPEED_10000MBPS
293 * %AD_LINK_SPEED_14000MBPS,
294 * %AD_LINK_SPEED_20000MBPS
295 * %AD_LINK_SPEED_25000MBPS
296 * %AD_LINK_SPEED_40000MBPS
297 * %AD_LINK_SPEED_50000MBPS
298 * %AD_LINK_SPEED_56000MBPS
299 * %AD_LINK_SPEED_100000MBPS
300 * %AD_LINK_SPEED_200000MBPS
301 * %AD_LINK_SPEED_400000MBPS
302 * %AD_LINK_SPEED_800000MBPS
303 */
304static u16 __get_link_speed(struct port *port)
305{
306 struct slave *slave = port->slave;
307 u16 speed;
308
309 /* this if covers only a special case: when the configuration starts
310 * with link down, it sets the speed to 0.
311 * This is done in spite of the fact that the e100 driver reports 0
312 * to be compatible with MVT in the future.
313 */
314 if (slave->link != BOND_LINK_UP)
315 speed = 0;
316 else {
317 switch (slave->speed) {
318 case SPEED_10:
319 speed = AD_LINK_SPEED_10MBPS;
320 break;
321
322 case SPEED_100:
323 speed = AD_LINK_SPEED_100MBPS;
324 break;
325
326 case SPEED_1000:
327 speed = AD_LINK_SPEED_1000MBPS;
328 break;
329
330 case SPEED_2500:
331 speed = AD_LINK_SPEED_2500MBPS;
332 break;
333
334 case SPEED_5000:
335 speed = AD_LINK_SPEED_5000MBPS;
336 break;
337
338 case SPEED_10000:
339 speed = AD_LINK_SPEED_10000MBPS;
340 break;
341
342 case SPEED_14000:
343 speed = AD_LINK_SPEED_14000MBPS;
344 break;
345
346 case SPEED_20000:
347 speed = AD_LINK_SPEED_20000MBPS;
348 break;
349
350 case SPEED_25000:
351 speed = AD_LINK_SPEED_25000MBPS;
352 break;
353
354 case SPEED_40000:
355 speed = AD_LINK_SPEED_40000MBPS;
356 break;
357
358 case SPEED_50000:
359 speed = AD_LINK_SPEED_50000MBPS;
360 break;
361
362 case SPEED_56000:
363 speed = AD_LINK_SPEED_56000MBPS;
364 break;
365
366 case SPEED_100000:
367 speed = AD_LINK_SPEED_100000MBPS;
368 break;
369
370 case SPEED_200000:
371 speed = AD_LINK_SPEED_200000MBPS;
372 break;
373
374 case SPEED_400000:
375 speed = AD_LINK_SPEED_400000MBPS;
376 break;
377
378 case SPEED_800000:
379 speed = AD_LINK_SPEED_800000MBPS;
380 break;
381
382 default:
383 /* unknown speed value from ethtool. shouldn't happen */
384 if (slave->speed != SPEED_UNKNOWN)
385 pr_err_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n",
386 slave->bond->dev->name,
387 slave->dev->name, slave->speed,
388 port->actor_port_number);
389 speed = 0;
390 break;
391 }
392 }
393
394 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n",
395 port->actor_port_number, speed);
396 return speed;
397}
398
399/**
400 * __get_duplex - get a port's duplex
401 * @port: the port we're looking at
402 *
403 * Return @port's duplex in 802.3ad bitmask format. i.e.:
404 * 0x01 if in full duplex
405 * 0x00 otherwise
406 */
407static u8 __get_duplex(struct port *port)
408{
409 struct slave *slave = port->slave;
410 u8 retval = 0x0;
411
412 /* handling a special case: when the configuration starts with
413 * link down, it sets the duplex to 0.
414 */
415 if (slave->link == BOND_LINK_UP) {
416 switch (slave->duplex) {
417 case DUPLEX_FULL:
418 retval = 0x1;
419 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n",
420 port->actor_port_number);
421 break;
422 case DUPLEX_HALF:
423 default:
424 retval = 0x0;
425 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n",
426 port->actor_port_number);
427 break;
428 }
429 }
430 return retval;
431}
432
433static void __ad_actor_update_port(struct port *port)
434{
435 const struct bonding *bond = bond_get_bond_by_slave(port->slave);
436
437 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
438 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
439}
440
441/* Conversions */
442
443/**
444 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
445 * @timer_type: which timer to operate
446 * @par: timer parameter. see below
447 *
448 * If @timer_type is %current_while_timer, @par indicates long/short timer.
449 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
450 * %SLOW_PERIODIC_TIME.
451 */
452static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
453{
454 u16 retval = 0; /* to silence the compiler */
455
456 switch (timer_type) {
457 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
458 if (par)
459 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
460 else
461 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
462 break;
463 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
464 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
465 break;
466 case AD_PERIODIC_TIMER: /* for periodic machine */
467 retval = (par*ad_ticks_per_sec); /* long timeout */
468 break;
469 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
470 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
471 break;
472 case AD_WAIT_WHILE_TIMER: /* for selection machine */
473 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
474 break;
475 }
476
477 return retval;
478}
479
480
481/* ================= ad_rx_machine helper functions ================== */
482
483/**
484 * __choose_matched - update a port's matched variable from a received lacpdu
485 * @lacpdu: the lacpdu we've received
486 * @port: the port we're looking at
487 *
488 * Update the value of the matched variable, using parameter values from a
489 * newly received lacpdu. Parameter values for the partner carried in the
490 * received PDU are compared with the corresponding operational parameter
491 * values for the actor. Matched is set to TRUE if all of these parameters
492 * match and the PDU parameter partner_state.aggregation has the same value as
493 * actor_oper_port_state.aggregation and lacp will actively maintain the link
494 * in the aggregation. Matched is also set to TRUE if the value of
495 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
496 * an individual link and lacp will actively maintain the link. Otherwise,
497 * matched is set to FALSE. LACP is considered to be actively maintaining the
498 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
499 * the actor's actor_oper_port_state.lacp_activity and the PDU's
500 * partner_state.lacp_activity variables are TRUE.
501 *
502 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
503 * used here to implement the language from 802.3ad 43.4.9 that requires
504 * recordPDU to "match" the LACPDU parameters to the stored values.
505 */
506static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
507{
508 /* check if all parameters are alike
509 * or this is individual link(aggregation == FALSE)
510 * then update the state machine Matched variable.
511 */
512 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
513 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
514 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
515 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
516 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
517 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) ||
518 ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0)
519 ) {
520 port->sm_vars |= AD_PORT_MATCHED;
521 } else {
522 port->sm_vars &= ~AD_PORT_MATCHED;
523 }
524}
525
526/**
527 * __record_pdu - record parameters from a received lacpdu
528 * @lacpdu: the lacpdu we've received
529 * @port: the port we're looking at
530 *
531 * Record the parameter values for the Actor carried in a received lacpdu as
532 * the current partner operational parameter values and sets
533 * actor_oper_port_state.defaulted to FALSE.
534 */
535static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
536{
537 if (lacpdu && port) {
538 struct port_params *partner = &port->partner_oper;
539
540 __choose_matched(lacpdu, port);
541 /* record the new parameter values for the partner
542 * operational
543 */
544 partner->port_number = ntohs(lacpdu->actor_port);
545 partner->port_priority = ntohs(lacpdu->actor_port_priority);
546 partner->system = lacpdu->actor_system;
547 partner->system_priority = ntohs(lacpdu->actor_system_priority);
548 partner->key = ntohs(lacpdu->actor_key);
549 partner->port_state = lacpdu->actor_state;
550
551 /* set actor_oper_port_state.defaulted to FALSE */
552 port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED;
553
554 /* set the partner sync. to on if the partner is sync,
555 * and the port is matched
556 */
557 if ((port->sm_vars & AD_PORT_MATCHED) &&
558 (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) {
559 partner->port_state |= LACP_STATE_SYNCHRONIZATION;
560 slave_dbg(port->slave->bond->dev, port->slave->dev,
561 "partner sync=1\n");
562 } else {
563 partner->port_state &= ~LACP_STATE_SYNCHRONIZATION;
564 slave_dbg(port->slave->bond->dev, port->slave->dev,
565 "partner sync=0\n");
566 }
567 }
568}
569
570/**
571 * __record_default - record default parameters
572 * @port: the port we're looking at
573 *
574 * This function records the default parameter values for the partner carried
575 * in the Partner Admin parameters as the current partner operational parameter
576 * values and sets actor_oper_port_state.defaulted to TRUE.
577 */
578static void __record_default(struct port *port)
579{
580 if (port) {
581 /* record the partner admin parameters */
582 memcpy(&port->partner_oper, &port->partner_admin,
583 sizeof(struct port_params));
584
585 /* set actor_oper_port_state.defaulted to true */
586 port->actor_oper_port_state |= LACP_STATE_DEFAULTED;
587 }
588}
589
590/**
591 * __update_selected - update a port's Selected variable from a received lacpdu
592 * @lacpdu: the lacpdu we've received
593 * @port: the port we're looking at
594 *
595 * Update the value of the selected variable, using parameter values from a
596 * newly received lacpdu. The parameter values for the Actor carried in the
597 * received PDU are compared with the corresponding operational parameter
598 * values for the ports partner. If one or more of the comparisons shows that
599 * the value(s) received in the PDU differ from the current operational values,
600 * then selected is set to FALSE and actor_oper_port_state.synchronization is
601 * set to out_of_sync. Otherwise, selected remains unchanged.
602 */
603static void __update_selected(struct lacpdu *lacpdu, struct port *port)
604{
605 if (lacpdu && port) {
606 const struct port_params *partner = &port->partner_oper;
607
608 /* check if any parameter is different then
609 * update the state machine selected variable.
610 */
611 if (ntohs(lacpdu->actor_port) != partner->port_number ||
612 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
613 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
614 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
615 ntohs(lacpdu->actor_key) != partner->key ||
616 (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) {
617 port->sm_vars &= ~AD_PORT_SELECTED;
618 }
619 }
620}
621
622/**
623 * __update_default_selected - update a port's Selected variable from Partner
624 * @port: the port we're looking at
625 *
626 * This function updates the value of the selected variable, using the partner
627 * administrative parameter values. The administrative values are compared with
628 * the corresponding operational parameter values for the partner. If one or
629 * more of the comparisons shows that the administrative value(s) differ from
630 * the current operational values, then Selected is set to FALSE and
631 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
632 * Selected remains unchanged.
633 */
634static void __update_default_selected(struct port *port)
635{
636 if (port) {
637 const struct port_params *admin = &port->partner_admin;
638 const struct port_params *oper = &port->partner_oper;
639
640 /* check if any parameter is different then
641 * update the state machine selected variable.
642 */
643 if (admin->port_number != oper->port_number ||
644 admin->port_priority != oper->port_priority ||
645 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
646 admin->system_priority != oper->system_priority ||
647 admin->key != oper->key ||
648 (admin->port_state & LACP_STATE_AGGREGATION)
649 != (oper->port_state & LACP_STATE_AGGREGATION)) {
650 port->sm_vars &= ~AD_PORT_SELECTED;
651 }
652 }
653}
654
655/**
656 * __update_ntt - update a port's ntt variable from a received lacpdu
657 * @lacpdu: the lacpdu we've received
658 * @port: the port we're looking at
659 *
660 * Updates the value of the ntt variable, using parameter values from a newly
661 * received lacpdu. The parameter values for the partner carried in the
662 * received PDU are compared with the corresponding operational parameter
663 * values for the Actor. If one or more of the comparisons shows that the
664 * value(s) received in the PDU differ from the current operational values,
665 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
666 */
667static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
668{
669 /* validate lacpdu and port */
670 if (lacpdu && port) {
671 /* check if any parameter is different then
672 * update the port->ntt.
673 */
674 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
675 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
676 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
677 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
678 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
679 ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) ||
680 ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) ||
681 ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) ||
682 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION))
683 ) {
684 port->ntt = true;
685 }
686 }
687}
688
689/**
690 * __agg_ports_are_ready - check if all ports in an aggregator are ready
691 * @aggregator: the aggregator we're looking at
692 *
693 */
694static int __agg_ports_are_ready(struct aggregator *aggregator)
695{
696 struct port *port;
697 int retval = 1;
698
699 if (aggregator) {
700 /* scan all ports in this aggregator to verfy if they are
701 * all ready.
702 */
703 for (port = aggregator->lag_ports;
704 port;
705 port = port->next_port_in_aggregator) {
706 if (!(port->sm_vars & AD_PORT_READY_N)) {
707 retval = 0;
708 break;
709 }
710 }
711 }
712
713 return retval;
714}
715
716/**
717 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
718 * @aggregator: the aggregator we're looking at
719 * @val: Should the ports' ready bit be set on or off
720 *
721 */
722static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
723{
724 struct port *port;
725
726 for (port = aggregator->lag_ports; port;
727 port = port->next_port_in_aggregator) {
728 if (val)
729 port->sm_vars |= AD_PORT_READY;
730 else
731 port->sm_vars &= ~AD_PORT_READY;
732 }
733}
734
735static int __agg_active_ports(struct aggregator *agg)
736{
737 struct port *port;
738 int active = 0;
739
740 for (port = agg->lag_ports; port;
741 port = port->next_port_in_aggregator) {
742 if (port->is_enabled)
743 active++;
744 }
745
746 return active;
747}
748
749/**
750 * __get_agg_bandwidth - get the total bandwidth of an aggregator
751 * @aggregator: the aggregator we're looking at
752 *
753 */
754static u32 __get_agg_bandwidth(struct aggregator *aggregator)
755{
756 int nports = __agg_active_ports(aggregator);
757 u32 bandwidth = 0;
758
759 if (nports) {
760 switch (__get_link_speed(aggregator->lag_ports)) {
761 case AD_LINK_SPEED_1MBPS:
762 bandwidth = nports;
763 break;
764 case AD_LINK_SPEED_10MBPS:
765 bandwidth = nports * 10;
766 break;
767 case AD_LINK_SPEED_100MBPS:
768 bandwidth = nports * 100;
769 break;
770 case AD_LINK_SPEED_1000MBPS:
771 bandwidth = nports * 1000;
772 break;
773 case AD_LINK_SPEED_2500MBPS:
774 bandwidth = nports * 2500;
775 break;
776 case AD_LINK_SPEED_5000MBPS:
777 bandwidth = nports * 5000;
778 break;
779 case AD_LINK_SPEED_10000MBPS:
780 bandwidth = nports * 10000;
781 break;
782 case AD_LINK_SPEED_14000MBPS:
783 bandwidth = nports * 14000;
784 break;
785 case AD_LINK_SPEED_20000MBPS:
786 bandwidth = nports * 20000;
787 break;
788 case AD_LINK_SPEED_25000MBPS:
789 bandwidth = nports * 25000;
790 break;
791 case AD_LINK_SPEED_40000MBPS:
792 bandwidth = nports * 40000;
793 break;
794 case AD_LINK_SPEED_50000MBPS:
795 bandwidth = nports * 50000;
796 break;
797 case AD_LINK_SPEED_56000MBPS:
798 bandwidth = nports * 56000;
799 break;
800 case AD_LINK_SPEED_100000MBPS:
801 bandwidth = nports * 100000;
802 break;
803 case AD_LINK_SPEED_200000MBPS:
804 bandwidth = nports * 200000;
805 break;
806 case AD_LINK_SPEED_400000MBPS:
807 bandwidth = nports * 400000;
808 break;
809 case AD_LINK_SPEED_800000MBPS:
810 bandwidth = nports * 800000;
811 break;
812 default:
813 bandwidth = 0; /* to silence the compiler */
814 }
815 }
816 return bandwidth;
817}
818
819/**
820 * __get_active_agg - get the current active aggregator
821 * @aggregator: the aggregator we're looking at
822 *
823 * Caller must hold RCU lock.
824 */
825static struct aggregator *__get_active_agg(struct aggregator *aggregator)
826{
827 struct bonding *bond = aggregator->slave->bond;
828 struct list_head *iter;
829 struct slave *slave;
830
831 bond_for_each_slave_rcu(bond, slave, iter)
832 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
833 return &(SLAVE_AD_INFO(slave)->aggregator);
834
835 return NULL;
836}
837
838/**
839 * __update_lacpdu_from_port - update a port's lacpdu fields
840 * @port: the port we're looking at
841 */
842static inline void __update_lacpdu_from_port(struct port *port)
843{
844 struct lacpdu *lacpdu = &port->lacpdu;
845 const struct port_params *partner = &port->partner_oper;
846
847 /* update current actual Actor parameters
848 * lacpdu->subtype initialized
849 * lacpdu->version_number initialized
850 * lacpdu->tlv_type_actor_info initialized
851 * lacpdu->actor_information_length initialized
852 */
853
854 lacpdu->actor_system_priority = htons(port->actor_system_priority);
855 lacpdu->actor_system = port->actor_system;
856 lacpdu->actor_key = htons(port->actor_oper_port_key);
857 lacpdu->actor_port_priority = htons(port->actor_port_priority);
858 lacpdu->actor_port = htons(port->actor_port_number);
859 lacpdu->actor_state = port->actor_oper_port_state;
860 slave_dbg(port->slave->bond->dev, port->slave->dev,
861 "update lacpdu: actor port state %x\n",
862 port->actor_oper_port_state);
863
864 /* lacpdu->reserved_3_1 initialized
865 * lacpdu->tlv_type_partner_info initialized
866 * lacpdu->partner_information_length initialized
867 */
868
869 lacpdu->partner_system_priority = htons(partner->system_priority);
870 lacpdu->partner_system = partner->system;
871 lacpdu->partner_key = htons(partner->key);
872 lacpdu->partner_port_priority = htons(partner->port_priority);
873 lacpdu->partner_port = htons(partner->port_number);
874 lacpdu->partner_state = partner->port_state;
875
876 /* lacpdu->reserved_3_2 initialized
877 * lacpdu->tlv_type_collector_info initialized
878 * lacpdu->collector_information_length initialized
879 * collector_max_delay initialized
880 * reserved_12[12] initialized
881 * tlv_type_terminator initialized
882 * terminator_length initialized
883 * reserved_50[50] initialized
884 */
885}
886
887/* ================= main 802.3ad protocol code ========================= */
888
889/**
890 * ad_lacpdu_send - send out a lacpdu packet on a given port
891 * @port: the port we're looking at
892 *
893 * Returns: 0 on success
894 * < 0 on error
895 */
896static int ad_lacpdu_send(struct port *port)
897{
898 struct slave *slave = port->slave;
899 struct sk_buff *skb;
900 struct lacpdu_header *lacpdu_header;
901 int length = sizeof(struct lacpdu_header);
902
903 skb = dev_alloc_skb(length);
904 if (!skb)
905 return -ENOMEM;
906
907 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx);
908 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx);
909
910 skb->dev = slave->dev;
911 skb_reset_mac_header(skb);
912 skb->network_header = skb->mac_header + ETH_HLEN;
913 skb->protocol = PKT_TYPE_LACPDU;
914 skb->priority = TC_PRIO_CONTROL;
915
916 lacpdu_header = skb_put(skb, length);
917
918 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
919 /* Note: source address is set to be the member's PERMANENT address,
920 * because we use it to identify loopback lacpdus in receive.
921 */
922 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
923 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
924
925 lacpdu_header->lacpdu = port->lacpdu;
926
927 dev_queue_xmit(skb);
928
929 return 0;
930}
931
932/**
933 * ad_marker_send - send marker information/response on a given port
934 * @port: the port we're looking at
935 * @marker: marker data to send
936 *
937 * Returns: 0 on success
938 * < 0 on error
939 */
940static int ad_marker_send(struct port *port, struct bond_marker *marker)
941{
942 struct slave *slave = port->slave;
943 struct sk_buff *skb;
944 struct bond_marker_header *marker_header;
945 int length = sizeof(struct bond_marker_header);
946
947 skb = dev_alloc_skb(length + 16);
948 if (!skb)
949 return -ENOMEM;
950
951 switch (marker->tlv_type) {
952 case AD_MARKER_INFORMATION_SUBTYPE:
953 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx);
954 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx);
955 break;
956 case AD_MARKER_RESPONSE_SUBTYPE:
957 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx);
958 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx);
959 break;
960 }
961
962 skb_reserve(skb, 16);
963
964 skb->dev = slave->dev;
965 skb_reset_mac_header(skb);
966 skb->network_header = skb->mac_header + ETH_HLEN;
967 skb->protocol = PKT_TYPE_LACPDU;
968
969 marker_header = skb_put(skb, length);
970
971 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
972 /* Note: source address is set to be the member's PERMANENT address,
973 * because we use it to identify loopback MARKERs in receive.
974 */
975 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
976 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
977
978 marker_header->marker = *marker;
979
980 dev_queue_xmit(skb);
981
982 return 0;
983}
984
985/**
986 * ad_mux_machine - handle a port's mux state machine
987 * @port: the port we're looking at
988 * @update_slave_arr: Does slave array need update?
989 */
990static void ad_mux_machine(struct port *port, bool *update_slave_arr)
991{
992 struct bonding *bond = __get_bond_by_port(port);
993 mux_states_t last_state;
994
995 /* keep current State Machine state to compare later if it was
996 * changed
997 */
998 last_state = port->sm_mux_state;
999
1000 if (port->sm_vars & AD_PORT_BEGIN) {
1001 port->sm_mux_state = AD_MUX_DETACHED;
1002 } else {
1003 switch (port->sm_mux_state) {
1004 case AD_MUX_DETACHED:
1005 if ((port->sm_vars & AD_PORT_SELECTED)
1006 || (port->sm_vars & AD_PORT_STANDBY))
1007 /* if SELECTED or STANDBY */
1008 port->sm_mux_state = AD_MUX_WAITING;
1009 break;
1010 case AD_MUX_WAITING:
1011 /* if SELECTED == FALSE return to DETACH state */
1012 if (!(port->sm_vars & AD_PORT_SELECTED)) {
1013 port->sm_vars &= ~AD_PORT_READY_N;
1014 /* in order to withhold the Selection Logic to
1015 * check all ports READY_N value every callback
1016 * cycle to update ready variable, we check
1017 * READY_N and update READY here
1018 */
1019 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1020 port->sm_mux_state = AD_MUX_DETACHED;
1021 break;
1022 }
1023
1024 /* check if the wait_while_timer expired */
1025 if (port->sm_mux_timer_counter
1026 && !(--port->sm_mux_timer_counter))
1027 port->sm_vars |= AD_PORT_READY_N;
1028
1029 /* in order to withhold the selection logic to check
1030 * all ports READY_N value every callback cycle to
1031 * update ready variable, we check READY_N and update
1032 * READY here
1033 */
1034 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1035
1036 /* if the wait_while_timer expired, and the port is
1037 * in READY state, move to ATTACHED state
1038 */
1039 if ((port->sm_vars & AD_PORT_READY)
1040 && !port->sm_mux_timer_counter)
1041 port->sm_mux_state = AD_MUX_ATTACHED;
1042 break;
1043 case AD_MUX_ATTACHED:
1044 /* check also if agg_select_timer expired (so the
1045 * edable port will take place only after this timer)
1046 */
1047 if ((port->sm_vars & AD_PORT_SELECTED) &&
1048 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
1049 !__check_agg_selection_timer(port)) {
1050 if (port->aggregator->is_active) {
1051 int state = AD_MUX_COLLECTING_DISTRIBUTING;
1052
1053 if (!bond->params.coupled_control)
1054 state = AD_MUX_COLLECTING;
1055 port->sm_mux_state = state;
1056 }
1057 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
1058 (port->sm_vars & AD_PORT_STANDBY)) {
1059 /* if UNSELECTED or STANDBY */
1060 port->sm_vars &= ~AD_PORT_READY_N;
1061 /* in order to withhold the selection logic to
1062 * check all ports READY_N value every callback
1063 * cycle to update ready variable, we check
1064 * READY_N and update READY here
1065 */
1066 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1067 port->sm_mux_state = AD_MUX_DETACHED;
1068 } else if (port->aggregator->is_active) {
1069 port->actor_oper_port_state |=
1070 LACP_STATE_SYNCHRONIZATION;
1071 }
1072 break;
1073 case AD_MUX_COLLECTING_DISTRIBUTING:
1074 if (!__port_move_to_attached_state(port)) {
1075 /* if port state hasn't changed make
1076 * sure that a collecting distributing
1077 * port in an active aggregator is enabled
1078 */
1079 if (port->aggregator->is_active &&
1080 !__port_is_collecting_distributing(port)) {
1081 __enable_port(port);
1082 *update_slave_arr = true;
1083 }
1084 }
1085 break;
1086 case AD_MUX_COLLECTING:
1087 if (!__port_move_to_attached_state(port)) {
1088 if ((port->sm_vars & AD_PORT_SELECTED) &&
1089 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
1090 (port->partner_oper.port_state & LACP_STATE_COLLECTING)) {
1091 port->sm_mux_state = AD_MUX_DISTRIBUTING;
1092 } else {
1093 /* If port state hasn't changed, make sure that a collecting
1094 * port is enabled for an active aggregator.
1095 */
1096 struct slave *slave = port->slave;
1097
1098 if (port->aggregator->is_active &&
1099 bond_is_slave_rx_disabled(slave)) {
1100 ad_enable_collecting(port);
1101 *update_slave_arr = true;
1102 }
1103 }
1104 }
1105 break;
1106 case AD_MUX_DISTRIBUTING:
1107 if (!(port->sm_vars & AD_PORT_SELECTED) ||
1108 (port->sm_vars & AD_PORT_STANDBY) ||
1109 !(port->partner_oper.port_state & LACP_STATE_COLLECTING) ||
1110 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
1111 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) {
1112 port->sm_mux_state = AD_MUX_COLLECTING;
1113 } else {
1114 /* if port state hasn't changed make
1115 * sure that a collecting distributing
1116 * port in an active aggregator is enabled
1117 */
1118 if (port->aggregator &&
1119 port->aggregator->is_active &&
1120 !__port_is_collecting_distributing(port)) {
1121 __enable_port(port);
1122 *update_slave_arr = true;
1123 }
1124 }
1125 break;
1126 default:
1127 break;
1128 }
1129 }
1130
1131 /* check if the state machine was changed */
1132 if (port->sm_mux_state != last_state) {
1133 slave_dbg(port->slave->bond->dev, port->slave->dev,
1134 "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
1135 port->actor_port_number,
1136 last_state,
1137 port->sm_mux_state);
1138 switch (port->sm_mux_state) {
1139 case AD_MUX_DETACHED:
1140 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1141 ad_disable_collecting_distributing(port,
1142 update_slave_arr);
1143 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1144 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1145 port->ntt = true;
1146 break;
1147 case AD_MUX_WAITING:
1148 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1149 break;
1150 case AD_MUX_ATTACHED:
1151 if (port->aggregator->is_active)
1152 port->actor_oper_port_state |=
1153 LACP_STATE_SYNCHRONIZATION;
1154 else
1155 port->actor_oper_port_state &=
1156 ~LACP_STATE_SYNCHRONIZATION;
1157 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1158 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1159 ad_disable_collecting_distributing(port,
1160 update_slave_arr);
1161 port->ntt = true;
1162 break;
1163 case AD_MUX_COLLECTING_DISTRIBUTING:
1164 port->actor_oper_port_state |= LACP_STATE_COLLECTING;
1165 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
1166 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1167 ad_enable_collecting_distributing(port,
1168 update_slave_arr);
1169 port->ntt = true;
1170 break;
1171 case AD_MUX_COLLECTING:
1172 port->actor_oper_port_state |= LACP_STATE_COLLECTING;
1173 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1174 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1175 ad_enable_collecting(port);
1176 ad_disable_distributing(port, update_slave_arr);
1177 port->ntt = true;
1178 break;
1179 case AD_MUX_DISTRIBUTING:
1180 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
1181 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1182 ad_enable_collecting_distributing(port,
1183 update_slave_arr);
1184 break;
1185 default:
1186 break;
1187 }
1188 }
1189}
1190
1191/**
1192 * ad_rx_machine - handle a port's rx State Machine
1193 * @lacpdu: the lacpdu we've received
1194 * @port: the port we're looking at
1195 *
1196 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1197 * CURRENT. If timer expired set the state machine in the proper state.
1198 * In other cases, this function checks if we need to switch to other state.
1199 */
1200static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1201{
1202 rx_states_t last_state;
1203
1204 /* keep current State Machine state to compare later if it was
1205 * changed
1206 */
1207 last_state = port->sm_rx_state;
1208
1209 if (lacpdu) {
1210 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx);
1211 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx);
1212 }
1213 /* check if state machine should change state */
1214
1215 /* first, check if port was reinitialized */
1216 if (port->sm_vars & AD_PORT_BEGIN) {
1217 port->sm_rx_state = AD_RX_INITIALIZE;
1218 port->sm_vars |= AD_PORT_CHURNED;
1219 /* check if port is not enabled */
1220 } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1221 port->sm_rx_state = AD_RX_PORT_DISABLED;
1222 /* check if new lacpdu arrived */
1223 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1224 (port->sm_rx_state == AD_RX_DEFAULTED) ||
1225 (port->sm_rx_state == AD_RX_CURRENT))) {
1226 if (port->sm_rx_state != AD_RX_CURRENT)
1227 port->sm_vars |= AD_PORT_CHURNED;
1228 port->sm_rx_timer_counter = 0;
1229 port->sm_rx_state = AD_RX_CURRENT;
1230 } else {
1231 /* if timer is on, and if it is expired */
1232 if (port->sm_rx_timer_counter &&
1233 !(--port->sm_rx_timer_counter)) {
1234 switch (port->sm_rx_state) {
1235 case AD_RX_EXPIRED:
1236 port->sm_rx_state = AD_RX_DEFAULTED;
1237 break;
1238 case AD_RX_CURRENT:
1239 port->sm_rx_state = AD_RX_EXPIRED;
1240 break;
1241 default:
1242 break;
1243 }
1244 } else {
1245 /* if no lacpdu arrived and no timer is on */
1246 switch (port->sm_rx_state) {
1247 case AD_RX_PORT_DISABLED:
1248 if (port->is_enabled &&
1249 (port->sm_vars & AD_PORT_LACP_ENABLED))
1250 port->sm_rx_state = AD_RX_EXPIRED;
1251 else if (port->is_enabled
1252 && ((port->sm_vars
1253 & AD_PORT_LACP_ENABLED) == 0))
1254 port->sm_rx_state = AD_RX_LACP_DISABLED;
1255 break;
1256 default:
1257 break;
1258
1259 }
1260 }
1261 }
1262
1263 /* check if the State machine was changed or new lacpdu arrived */
1264 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1265 slave_dbg(port->slave->bond->dev, port->slave->dev,
1266 "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1267 port->actor_port_number,
1268 last_state,
1269 port->sm_rx_state);
1270 switch (port->sm_rx_state) {
1271 case AD_RX_INITIALIZE:
1272 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1273 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1274 else
1275 port->sm_vars |= AD_PORT_LACP_ENABLED;
1276 port->sm_vars &= ~AD_PORT_SELECTED;
1277 __record_default(port);
1278 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1279 port->sm_rx_state = AD_RX_PORT_DISABLED;
1280
1281 fallthrough;
1282 case AD_RX_PORT_DISABLED:
1283 port->sm_vars &= ~AD_PORT_MATCHED;
1284 break;
1285 case AD_RX_LACP_DISABLED:
1286 port->sm_vars &= ~AD_PORT_SELECTED;
1287 __record_default(port);
1288 port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION;
1289 port->sm_vars |= AD_PORT_MATCHED;
1290 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1291 break;
1292 case AD_RX_EXPIRED:
1293 /* Reset of the Synchronization flag (Standard 43.4.12)
1294 * This reset cause to disable this port in the
1295 * COLLECTING_DISTRIBUTING state of the mux machine in
1296 * case of EXPIRED even if LINK_DOWN didn't arrive for
1297 * the port.
1298 */
1299 port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION;
1300 port->sm_vars &= ~AD_PORT_MATCHED;
1301 port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT;
1302 port->partner_oper.port_state |= LACP_STATE_LACP_ACTIVITY;
1303 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1304 port->actor_oper_port_state |= LACP_STATE_EXPIRED;
1305 port->sm_vars |= AD_PORT_CHURNED;
1306 break;
1307 case AD_RX_DEFAULTED:
1308 __update_default_selected(port);
1309 __record_default(port);
1310 port->sm_vars |= AD_PORT_MATCHED;
1311 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1312 break;
1313 case AD_RX_CURRENT:
1314 /* detect loopback situation */
1315 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1316 &(port->actor_system))) {
1317 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n"
1318 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n");
1319 return;
1320 }
1321 __update_selected(lacpdu, port);
1322 __update_ntt(lacpdu, port);
1323 __record_pdu(lacpdu, port);
1324 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT));
1325 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1326 break;
1327 default:
1328 break;
1329 }
1330 }
1331}
1332
1333/**
1334 * ad_churn_machine - handle port churn's state machine
1335 * @port: the port we're looking at
1336 *
1337 */
1338static void ad_churn_machine(struct port *port)
1339{
1340 if (port->sm_vars & AD_PORT_CHURNED) {
1341 port->sm_vars &= ~AD_PORT_CHURNED;
1342 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1343 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1344 port->sm_churn_actor_timer_counter =
1345 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1346 port->sm_churn_partner_timer_counter =
1347 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1348 return;
1349 }
1350 if (port->sm_churn_actor_timer_counter &&
1351 !(--port->sm_churn_actor_timer_counter) &&
1352 port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1353 if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) {
1354 port->sm_churn_actor_state = AD_NO_CHURN;
1355 } else {
1356 port->churn_actor_count++;
1357 port->sm_churn_actor_state = AD_CHURN;
1358 }
1359 }
1360 if (port->sm_churn_partner_timer_counter &&
1361 !(--port->sm_churn_partner_timer_counter) &&
1362 port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1363 if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) {
1364 port->sm_churn_partner_state = AD_NO_CHURN;
1365 } else {
1366 port->churn_partner_count++;
1367 port->sm_churn_partner_state = AD_CHURN;
1368 }
1369 }
1370}
1371
1372/**
1373 * ad_tx_machine - handle a port's tx state machine
1374 * @port: the port we're looking at
1375 */
1376static void ad_tx_machine(struct port *port)
1377{
1378 /* check if tx timer expired, to verify that we do not send more than
1379 * 3 packets per second
1380 */
1381 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1382 /* check if there is something to send */
1383 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1384 __update_lacpdu_from_port(port);
1385
1386 if (ad_lacpdu_send(port) >= 0) {
1387 slave_dbg(port->slave->bond->dev,
1388 port->slave->dev,
1389 "Sent LACPDU on port %d\n",
1390 port->actor_port_number);
1391
1392 /* mark ntt as false, so it will not be sent
1393 * again until demanded
1394 */
1395 port->ntt = false;
1396 }
1397 }
1398 /* restart tx timer(to verify that we will not exceed
1399 * AD_MAX_TX_IN_SECOND
1400 */
1401 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1402 }
1403}
1404
1405/**
1406 * ad_periodic_machine - handle a port's periodic state machine
1407 * @port: the port we're looking at
1408 * @bond_params: bond parameters we will use
1409 *
1410 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1411 */
1412static void ad_periodic_machine(struct port *port, struct bond_params *bond_params)
1413{
1414 periodic_states_t last_state;
1415
1416 /* keep current state machine state to compare later if it was changed */
1417 last_state = port->sm_periodic_state;
1418
1419 /* check if port was reinitialized */
1420 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1421 (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY)) ||
1422 !bond_params->lacp_active) {
1423 port->sm_periodic_state = AD_NO_PERIODIC;
1424 }
1425 /* check if state machine should change state */
1426 else if (port->sm_periodic_timer_counter) {
1427 /* check if periodic state machine expired */
1428 if (!(--port->sm_periodic_timer_counter)) {
1429 /* if expired then do tx */
1430 port->sm_periodic_state = AD_PERIODIC_TX;
1431 } else {
1432 /* If not expired, check if there is some new timeout
1433 * parameter from the partner state
1434 */
1435 switch (port->sm_periodic_state) {
1436 case AD_FAST_PERIODIC:
1437 if (!(port->partner_oper.port_state
1438 & LACP_STATE_LACP_TIMEOUT))
1439 port->sm_periodic_state = AD_SLOW_PERIODIC;
1440 break;
1441 case AD_SLOW_PERIODIC:
1442 if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) {
1443 port->sm_periodic_timer_counter = 0;
1444 port->sm_periodic_state = AD_PERIODIC_TX;
1445 }
1446 break;
1447 default:
1448 break;
1449 }
1450 }
1451 } else {
1452 switch (port->sm_periodic_state) {
1453 case AD_NO_PERIODIC:
1454 port->sm_periodic_state = AD_FAST_PERIODIC;
1455 break;
1456 case AD_PERIODIC_TX:
1457 if (!(port->partner_oper.port_state &
1458 LACP_STATE_LACP_TIMEOUT))
1459 port->sm_periodic_state = AD_SLOW_PERIODIC;
1460 else
1461 port->sm_periodic_state = AD_FAST_PERIODIC;
1462 break;
1463 default:
1464 break;
1465 }
1466 }
1467
1468 /* check if the state machine was changed */
1469 if (port->sm_periodic_state != last_state) {
1470 slave_dbg(port->slave->bond->dev, port->slave->dev,
1471 "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1472 port->actor_port_number, last_state,
1473 port->sm_periodic_state);
1474 switch (port->sm_periodic_state) {
1475 case AD_NO_PERIODIC:
1476 port->sm_periodic_timer_counter = 0;
1477 break;
1478 case AD_FAST_PERIODIC:
1479 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1480 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1481 break;
1482 case AD_SLOW_PERIODIC:
1483 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1484 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1485 break;
1486 case AD_PERIODIC_TX:
1487 port->ntt = true;
1488 break;
1489 default:
1490 break;
1491 }
1492 }
1493}
1494
1495/**
1496 * ad_port_selection_logic - select aggregation groups
1497 * @port: the port we're looking at
1498 * @update_slave_arr: Does slave array need update?
1499 *
1500 * Select aggregation groups, and assign each port for it's aggregetor. The
1501 * selection logic is called in the inititalization (after all the handshkes),
1502 * and after every lacpdu receive (if selected is off).
1503 */
1504static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1505{
1506 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1507 struct port *last_port = NULL, *curr_port;
1508 struct list_head *iter;
1509 struct bonding *bond;
1510 struct slave *slave;
1511 int found = 0;
1512
1513 /* if the port is already Selected, do nothing */
1514 if (port->sm_vars & AD_PORT_SELECTED)
1515 return;
1516
1517 bond = __get_bond_by_port(port);
1518
1519 /* if the port is connected to other aggregator, detach it */
1520 if (port->aggregator) {
1521 /* detach the port from its former aggregator */
1522 temp_aggregator = port->aggregator;
1523 for (curr_port = temp_aggregator->lag_ports; curr_port;
1524 last_port = curr_port,
1525 curr_port = curr_port->next_port_in_aggregator) {
1526 if (curr_port == port) {
1527 temp_aggregator->num_of_ports--;
1528 /* if it is the first port attached to the
1529 * aggregator
1530 */
1531 if (!last_port) {
1532 temp_aggregator->lag_ports =
1533 port->next_port_in_aggregator;
1534 } else {
1535 /* not the first port attached to the
1536 * aggregator
1537 */
1538 last_port->next_port_in_aggregator =
1539 port->next_port_in_aggregator;
1540 }
1541
1542 /* clear the port's relations to this
1543 * aggregator
1544 */
1545 port->aggregator = NULL;
1546 port->next_port_in_aggregator = NULL;
1547 port->actor_port_aggregator_identifier = 0;
1548
1549 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n",
1550 port->actor_port_number,
1551 temp_aggregator->aggregator_identifier);
1552 /* if the aggregator is empty, clear its
1553 * parameters, and set it ready to be attached
1554 */
1555 if (!temp_aggregator->lag_ports)
1556 ad_clear_agg(temp_aggregator);
1557 break;
1558 }
1559 }
1560 if (!curr_port) {
1561 /* meaning: the port was related to an aggregator
1562 * but was not on the aggregator port list
1563 */
1564 net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n",
1565 port->slave->bond->dev->name,
1566 port->slave->dev->name,
1567 port->actor_port_number,
1568 port->aggregator->aggregator_identifier);
1569 }
1570 }
1571 /* search on all aggregators for a suitable aggregator for this port */
1572 bond_for_each_slave(bond, slave, iter) {
1573 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1574
1575 /* keep a free aggregator for later use(if needed) */
1576 if (!aggregator->lag_ports) {
1577 if (!free_aggregator)
1578 free_aggregator = aggregator;
1579 continue;
1580 }
1581 /* check if current aggregator suits us */
1582 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1583 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1584 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1585 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1586 ) &&
1587 ((__agg_has_partner(aggregator) && /* partner answers */
1588 !aggregator->is_individual) /* but is not individual OR */
1589 )
1590 ) {
1591 /* attach to the founded aggregator */
1592 port->aggregator = aggregator;
1593 port->actor_port_aggregator_identifier =
1594 port->aggregator->aggregator_identifier;
1595 port->next_port_in_aggregator = aggregator->lag_ports;
1596 port->aggregator->num_of_ports++;
1597 aggregator->lag_ports = port;
1598 slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n",
1599 port->actor_port_number,
1600 port->aggregator->aggregator_identifier);
1601
1602 /* mark this port as selected */
1603 port->sm_vars |= AD_PORT_SELECTED;
1604 found = 1;
1605 break;
1606 }
1607 }
1608
1609 /* the port couldn't find an aggregator - attach it to a new
1610 * aggregator
1611 */
1612 if (!found) {
1613 if (free_aggregator) {
1614 /* assign port a new aggregator */
1615 port->aggregator = free_aggregator;
1616 port->actor_port_aggregator_identifier =
1617 port->aggregator->aggregator_identifier;
1618
1619 /* update the new aggregator's parameters
1620 * if port was responsed from the end-user
1621 */
1622 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1623 /* if port is full duplex */
1624 port->aggregator->is_individual = false;
1625 else
1626 port->aggregator->is_individual = true;
1627
1628 port->aggregator->actor_admin_aggregator_key =
1629 port->actor_admin_port_key;
1630 port->aggregator->actor_oper_aggregator_key =
1631 port->actor_oper_port_key;
1632 port->aggregator->partner_system =
1633 port->partner_oper.system;
1634 port->aggregator->partner_system_priority =
1635 port->partner_oper.system_priority;
1636 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1637 port->aggregator->receive_state = 1;
1638 port->aggregator->transmit_state = 1;
1639 port->aggregator->lag_ports = port;
1640 port->aggregator->num_of_ports++;
1641
1642 /* mark this port as selected */
1643 port->sm_vars |= AD_PORT_SELECTED;
1644
1645 slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n",
1646 port->actor_port_number,
1647 port->aggregator->aggregator_identifier);
1648 } else {
1649 slave_err(bond->dev, port->slave->dev,
1650 "Port %d did not find a suitable aggregator\n",
1651 port->actor_port_number);
1652 return;
1653 }
1654 }
1655 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1656 * in all aggregator's ports, else set ready=FALSE in all
1657 * aggregator's ports
1658 */
1659 __set_agg_ports_ready(port->aggregator,
1660 __agg_ports_are_ready(port->aggregator));
1661
1662 aggregator = __get_first_agg(port);
1663 ad_agg_selection_logic(aggregator, update_slave_arr);
1664
1665 if (!port->aggregator->is_active)
1666 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1667}
1668
1669/* Decide if "agg" is a better choice for the new active aggregator that
1670 * the current best, according to the ad_select policy.
1671 */
1672static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1673 struct aggregator *curr)
1674{
1675 /* 0. If no best, select current.
1676 *
1677 * 1. If the current agg is not individual, and the best is
1678 * individual, select current.
1679 *
1680 * 2. If current agg is individual and the best is not, keep best.
1681 *
1682 * 3. Therefore, current and best are both individual or both not
1683 * individual, so:
1684 *
1685 * 3a. If current agg partner replied, and best agg partner did not,
1686 * select current.
1687 *
1688 * 3b. If current agg partner did not reply and best agg partner
1689 * did reply, keep best.
1690 *
1691 * 4. Therefore, current and best both have partner replies or
1692 * both do not, so perform selection policy:
1693 *
1694 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1695 * select by bandwidth.
1696 *
1697 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1698 */
1699 if (!best)
1700 return curr;
1701
1702 if (!curr->is_individual && best->is_individual)
1703 return curr;
1704
1705 if (curr->is_individual && !best->is_individual)
1706 return best;
1707
1708 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1709 return curr;
1710
1711 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1712 return best;
1713
1714 switch (__get_agg_selection_mode(curr->lag_ports)) {
1715 case BOND_AD_COUNT:
1716 if (__agg_active_ports(curr) > __agg_active_ports(best))
1717 return curr;
1718
1719 if (__agg_active_ports(curr) < __agg_active_ports(best))
1720 return best;
1721
1722 fallthrough;
1723 case BOND_AD_STABLE:
1724 case BOND_AD_BANDWIDTH:
1725 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1726 return curr;
1727
1728 break;
1729
1730 default:
1731 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n",
1732 curr->slave->bond->dev->name,
1733 curr->slave->dev->name,
1734 __get_agg_selection_mode(curr->lag_ports));
1735 break;
1736 }
1737
1738 return best;
1739}
1740
1741static int agg_device_up(const struct aggregator *agg)
1742{
1743 struct port *port = agg->lag_ports;
1744
1745 if (!port)
1746 return 0;
1747
1748 for (port = agg->lag_ports; port;
1749 port = port->next_port_in_aggregator) {
1750 if (netif_running(port->slave->dev) &&
1751 netif_carrier_ok(port->slave->dev))
1752 return 1;
1753 }
1754
1755 return 0;
1756}
1757
1758/**
1759 * ad_agg_selection_logic - select an aggregation group for a team
1760 * @agg: the aggregator we're looking at
1761 * @update_slave_arr: Does slave array need update?
1762 *
1763 * It is assumed that only one aggregator may be selected for a team.
1764 *
1765 * The logic of this function is to select the aggregator according to
1766 * the ad_select policy:
1767 *
1768 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1769 * it, and to reselect the active aggregator only if the previous
1770 * aggregator has no more ports related to it.
1771 *
1772 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1773 * bandwidth, and reselect whenever a link state change takes place or the
1774 * set of slaves in the bond changes.
1775 *
1776 * BOND_AD_COUNT: select the aggregator with largest number of ports
1777 * (slaves), and reselect whenever a link state change takes place or the
1778 * set of slaves in the bond changes.
1779 *
1780 * FIXME: this function MUST be called with the first agg in the bond, or
1781 * __get_active_agg() won't work correctly. This function should be better
1782 * called with the bond itself, and retrieve the first agg from it.
1783 */
1784static void ad_agg_selection_logic(struct aggregator *agg,
1785 bool *update_slave_arr)
1786{
1787 struct aggregator *best, *active, *origin;
1788 struct bonding *bond = agg->slave->bond;
1789 struct list_head *iter;
1790 struct slave *slave;
1791 struct port *port;
1792
1793 rcu_read_lock();
1794 origin = agg;
1795 active = __get_active_agg(agg);
1796 best = (active && agg_device_up(active)) ? active : NULL;
1797
1798 bond_for_each_slave_rcu(bond, slave, iter) {
1799 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1800
1801 agg->is_active = 0;
1802
1803 if (__agg_active_ports(agg) && agg_device_up(agg))
1804 best = ad_agg_selection_test(best, agg);
1805 }
1806
1807 if (best &&
1808 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1809 /* For the STABLE policy, don't replace the old active
1810 * aggregator if it's still active (it has an answering
1811 * partner) or if both the best and active don't have an
1812 * answering partner.
1813 */
1814 if (active && active->lag_ports &&
1815 __agg_active_ports(active) &&
1816 (__agg_has_partner(active) ||
1817 (!__agg_has_partner(active) &&
1818 !__agg_has_partner(best)))) {
1819 if (!(!active->actor_oper_aggregator_key &&
1820 best->actor_oper_aggregator_key)) {
1821 best = NULL;
1822 active->is_active = 1;
1823 }
1824 }
1825 }
1826
1827 if (best && (best == active)) {
1828 best = NULL;
1829 active->is_active = 1;
1830 }
1831
1832 /* if there is new best aggregator, activate it */
1833 if (best) {
1834 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1835 best->slave ? best->slave->dev->name : "NULL",
1836 best->aggregator_identifier, best->num_of_ports,
1837 best->actor_oper_aggregator_key,
1838 best->partner_oper_aggregator_key,
1839 best->is_individual, best->is_active);
1840 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n",
1841 best->slave ? best->slave->dev->name : "NULL",
1842 best->lag_ports, best->slave);
1843
1844 bond_for_each_slave_rcu(bond, slave, iter) {
1845 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1846
1847 slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1848 agg->aggregator_identifier, agg->num_of_ports,
1849 agg->actor_oper_aggregator_key,
1850 agg->partner_oper_aggregator_key,
1851 agg->is_individual, agg->is_active);
1852 }
1853
1854 /* check if any partner replies */
1855 if (best->is_individual)
1856 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1857 bond->dev->name);
1858
1859 best->is_active = 1;
1860 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n",
1861 best->slave ? best->slave->dev->name : "NULL",
1862 best->aggregator_identifier);
1863 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1864 best->slave ? best->slave->dev->name : "NULL",
1865 best->aggregator_identifier, best->num_of_ports,
1866 best->actor_oper_aggregator_key,
1867 best->partner_oper_aggregator_key,
1868 best->is_individual, best->is_active);
1869
1870 /* disable the ports that were related to the former
1871 * active_aggregator
1872 */
1873 if (active) {
1874 for (port = active->lag_ports; port;
1875 port = port->next_port_in_aggregator) {
1876 __disable_port(port);
1877 }
1878 }
1879 /* Slave array needs update. */
1880 *update_slave_arr = true;
1881 }
1882
1883 /* if the selected aggregator is of join individuals
1884 * (partner_system is NULL), enable their ports
1885 */
1886 active = __get_active_agg(origin);
1887
1888 if (active) {
1889 if (!__agg_has_partner(active)) {
1890 for (port = active->lag_ports; port;
1891 port = port->next_port_in_aggregator) {
1892 __enable_port(port);
1893 }
1894 *update_slave_arr = true;
1895 }
1896 }
1897
1898 rcu_read_unlock();
1899
1900 bond_3ad_set_carrier(bond);
1901}
1902
1903/**
1904 * ad_clear_agg - clear a given aggregator's parameters
1905 * @aggregator: the aggregator we're looking at
1906 */
1907static void ad_clear_agg(struct aggregator *aggregator)
1908{
1909 if (aggregator) {
1910 aggregator->is_individual = false;
1911 aggregator->actor_admin_aggregator_key = 0;
1912 aggregator->actor_oper_aggregator_key = 0;
1913 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1914 aggregator->partner_system_priority = 0;
1915 aggregator->partner_oper_aggregator_key = 0;
1916 aggregator->receive_state = 0;
1917 aggregator->transmit_state = 0;
1918 aggregator->lag_ports = NULL;
1919 aggregator->is_active = 0;
1920 aggregator->num_of_ports = 0;
1921 pr_debug("%s: LAG %d was cleared\n",
1922 aggregator->slave ?
1923 aggregator->slave->dev->name : "NULL",
1924 aggregator->aggregator_identifier);
1925 }
1926}
1927
1928/**
1929 * ad_initialize_agg - initialize a given aggregator's parameters
1930 * @aggregator: the aggregator we're looking at
1931 */
1932static void ad_initialize_agg(struct aggregator *aggregator)
1933{
1934 if (aggregator) {
1935 ad_clear_agg(aggregator);
1936
1937 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1938 aggregator->aggregator_identifier = 0;
1939 aggregator->slave = NULL;
1940 }
1941}
1942
1943/**
1944 * ad_initialize_port - initialize a given port's parameters
1945 * @port: the port we're looking at
1946 * @lacp_fast: boolean. whether fast periodic should be used
1947 */
1948static void ad_initialize_port(struct port *port, int lacp_fast)
1949{
1950 static const struct port_params tmpl = {
1951 .system_priority = 0xffff,
1952 .key = 1,
1953 .port_number = 1,
1954 .port_priority = 0xff,
1955 .port_state = 1,
1956 };
1957 static const struct lacpdu lacpdu = {
1958 .subtype = 0x01,
1959 .version_number = 0x01,
1960 .tlv_type_actor_info = 0x01,
1961 .actor_information_length = 0x14,
1962 .tlv_type_partner_info = 0x02,
1963 .partner_information_length = 0x14,
1964 .tlv_type_collector_info = 0x03,
1965 .collector_information_length = 0x10,
1966 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1967 };
1968
1969 if (port) {
1970 port->actor_port_priority = 0xff;
1971 port->actor_port_aggregator_identifier = 0;
1972 port->ntt = false;
1973 port->actor_admin_port_state = LACP_STATE_AGGREGATION |
1974 LACP_STATE_LACP_ACTIVITY;
1975 port->actor_oper_port_state = LACP_STATE_AGGREGATION |
1976 LACP_STATE_LACP_ACTIVITY;
1977
1978 if (lacp_fast)
1979 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
1980
1981 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1982 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1983
1984 port->is_enabled = true;
1985 /* private parameters */
1986 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1987 port->sm_rx_state = 0;
1988 port->sm_rx_timer_counter = 0;
1989 port->sm_periodic_state = 0;
1990 port->sm_periodic_timer_counter = 0;
1991 port->sm_mux_state = 0;
1992 port->sm_mux_timer_counter = 0;
1993 port->sm_tx_state = 0;
1994 port->aggregator = NULL;
1995 port->next_port_in_aggregator = NULL;
1996 port->transaction_id = 0;
1997
1998 port->sm_churn_actor_timer_counter = 0;
1999 port->sm_churn_actor_state = 0;
2000 port->churn_actor_count = 0;
2001 port->sm_churn_partner_timer_counter = 0;
2002 port->sm_churn_partner_state = 0;
2003 port->churn_partner_count = 0;
2004
2005 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
2006 }
2007}
2008
2009/**
2010 * ad_enable_collecting - enable a port's receive
2011 * @port: the port we're looking at
2012 *
2013 * Enable @port if it's in an active aggregator
2014 */
2015static void ad_enable_collecting(struct port *port)
2016{
2017 if (port->aggregator->is_active) {
2018 struct slave *slave = port->slave;
2019
2020 slave_dbg(slave->bond->dev, slave->dev,
2021 "Enabling collecting on port %d (LAG %d)\n",
2022 port->actor_port_number,
2023 port->aggregator->aggregator_identifier);
2024 __enable_collecting_port(port);
2025 }
2026}
2027
2028/**
2029 * ad_disable_distributing - disable a port's transmit
2030 * @port: the port we're looking at
2031 * @update_slave_arr: Does slave array need update?
2032 */
2033static void ad_disable_distributing(struct port *port, bool *update_slave_arr)
2034{
2035 if (port->aggregator && __agg_has_partner(port->aggregator)) {
2036 slave_dbg(port->slave->bond->dev, port->slave->dev,
2037 "Disabling distributing on port %d (LAG %d)\n",
2038 port->actor_port_number,
2039 port->aggregator->aggregator_identifier);
2040 __disable_distributing_port(port);
2041 /* Slave array needs an update */
2042 *update_slave_arr = true;
2043 }
2044}
2045
2046/**
2047 * ad_enable_collecting_distributing - enable a port's transmit/receive
2048 * @port: the port we're looking at
2049 * @update_slave_arr: Does slave array need update?
2050 *
2051 * Enable @port if it's in an active aggregator
2052 */
2053static void ad_enable_collecting_distributing(struct port *port,
2054 bool *update_slave_arr)
2055{
2056 if (port->aggregator->is_active) {
2057 slave_dbg(port->slave->bond->dev, port->slave->dev,
2058 "Enabling port %d (LAG %d)\n",
2059 port->actor_port_number,
2060 port->aggregator->aggregator_identifier);
2061 __enable_port(port);
2062 /* Slave array needs update */
2063 *update_slave_arr = true;
2064 }
2065}
2066
2067/**
2068 * ad_disable_collecting_distributing - disable a port's transmit/receive
2069 * @port: the port we're looking at
2070 * @update_slave_arr: Does slave array need update?
2071 */
2072static void ad_disable_collecting_distributing(struct port *port,
2073 bool *update_slave_arr)
2074{
2075 if (port->aggregator && __agg_has_partner(port->aggregator)) {
2076 slave_dbg(port->slave->bond->dev, port->slave->dev,
2077 "Disabling port %d (LAG %d)\n",
2078 port->actor_port_number,
2079 port->aggregator->aggregator_identifier);
2080 __disable_port(port);
2081 /* Slave array needs an update */
2082 *update_slave_arr = true;
2083 }
2084}
2085
2086/**
2087 * ad_marker_info_received - handle receive of a Marker information frame
2088 * @marker_info: Marker info received
2089 * @port: the port we're looking at
2090 */
2091static void ad_marker_info_received(struct bond_marker *marker_info,
2092 struct port *port)
2093{
2094 struct bond_marker marker;
2095
2096 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx);
2097 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx);
2098
2099 /* copy the received marker data to the response marker */
2100 memcpy(&marker, marker_info, sizeof(struct bond_marker));
2101 /* change the marker subtype to marker response */
2102 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
2103
2104 /* send the marker response */
2105 if (ad_marker_send(port, &marker) >= 0)
2106 slave_dbg(port->slave->bond->dev, port->slave->dev,
2107 "Sent Marker Response on port %d\n",
2108 port->actor_port_number);
2109}
2110
2111/**
2112 * ad_marker_response_received - handle receive of a marker response frame
2113 * @marker: marker PDU received
2114 * @port: the port we're looking at
2115 *
2116 * This function does nothing since we decided not to implement send and handle
2117 * response for marker PDU's, in this stage, but only to respond to marker
2118 * information.
2119 */
2120static void ad_marker_response_received(struct bond_marker *marker,
2121 struct port *port)
2122{
2123 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx);
2124 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx);
2125
2126 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
2127}
2128
2129/* ========= AD exported functions to the main bonding code ========= */
2130
2131/* Check aggregators status in team every T seconds */
2132#define AD_AGGREGATOR_SELECTION_TIMER 8
2133
2134/**
2135 * bond_3ad_initiate_agg_selection - initate aggregator selection
2136 * @bond: bonding struct
2137 * @timeout: timeout value to set
2138 *
2139 * Set the aggregation selection timer, to initiate an agg selection in
2140 * the very near future. Called during first initialization, and during
2141 * any down to up transitions of the bond.
2142 */
2143void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
2144{
2145 atomic_set(&BOND_AD_INFO(bond).agg_select_timer, timeout);
2146}
2147
2148/**
2149 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
2150 * @bond: bonding struct to work on
2151 *
2152 * Can be called only after the mac address of the bond is set.
2153 */
2154void bond_3ad_initialize(struct bonding *bond)
2155{
2156 BOND_AD_INFO(bond).aggregator_identifier = 0;
2157 BOND_AD_INFO(bond).system.sys_priority =
2158 bond->params.ad_actor_sys_prio;
2159 if (is_zero_ether_addr(bond->params.ad_actor_system))
2160 BOND_AD_INFO(bond).system.sys_mac_addr =
2161 *((struct mac_addr *)bond->dev->dev_addr);
2162 else
2163 BOND_AD_INFO(bond).system.sys_mac_addr =
2164 *((struct mac_addr *)bond->params.ad_actor_system);
2165
2166 bond_3ad_initiate_agg_selection(bond,
2167 AD_AGGREGATOR_SELECTION_TIMER *
2168 ad_ticks_per_sec);
2169}
2170
2171/**
2172 * bond_3ad_bind_slave - initialize a slave's port
2173 * @slave: slave struct to work on
2174 *
2175 * Returns: 0 on success
2176 * < 0 on error
2177 */
2178void bond_3ad_bind_slave(struct slave *slave)
2179{
2180 struct bonding *bond = bond_get_bond_by_slave(slave);
2181 struct port *port;
2182 struct aggregator *aggregator;
2183
2184 /* check that the slave has not been initialized yet. */
2185 if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2186
2187 /* port initialization */
2188 port = &(SLAVE_AD_INFO(slave)->port);
2189
2190 ad_initialize_port(port, bond->params.lacp_fast);
2191
2192 port->slave = slave;
2193 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2194 /* key is determined according to the link speed, duplex and
2195 * user key
2196 */
2197 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2198 ad_update_actor_keys(port, false);
2199 /* actor system is the bond's system */
2200 __ad_actor_update_port(port);
2201 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2202 * lacpdu's are sent in one second)
2203 */
2204 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2205
2206 __disable_port(port);
2207
2208 /* aggregator initialization */
2209 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2210
2211 ad_initialize_agg(aggregator);
2212
2213 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2214 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2215 aggregator->slave = slave;
2216 aggregator->is_active = 0;
2217 aggregator->num_of_ports = 0;
2218 }
2219}
2220
2221/**
2222 * bond_3ad_unbind_slave - deinitialize a slave's port
2223 * @slave: slave struct to work on
2224 *
2225 * Search for the aggregator that is related to this port, remove the
2226 * aggregator and assign another aggregator for other port related to it
2227 * (if any), and remove the port.
2228 */
2229void bond_3ad_unbind_slave(struct slave *slave)
2230{
2231 struct port *port, *prev_port, *temp_port;
2232 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2233 int select_new_active_agg = 0;
2234 struct bonding *bond = slave->bond;
2235 struct slave *slave_iter;
2236 struct list_head *iter;
2237 bool dummy_slave_update; /* Ignore this value as caller updates array */
2238
2239 /* Sync against bond_3ad_state_machine_handler() */
2240 spin_lock_bh(&bond->mode_lock);
2241 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2242 port = &(SLAVE_AD_INFO(slave)->port);
2243
2244 /* if slave is null, the whole port is not initialized */
2245 if (!port->slave) {
2246 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n");
2247 goto out;
2248 }
2249
2250 slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n",
2251 aggregator->aggregator_identifier);
2252
2253 /* Tell the partner that this port is not suitable for aggregation */
2254 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
2255 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
2256 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
2257 port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION;
2258 __update_lacpdu_from_port(port);
2259 ad_lacpdu_send(port);
2260
2261 /* check if this aggregator is occupied */
2262 if (aggregator->lag_ports) {
2263 /* check if there are other ports related to this aggregator
2264 * except the port related to this slave(thats ensure us that
2265 * there is a reason to search for new aggregator, and that we
2266 * will find one
2267 */
2268 if ((aggregator->lag_ports != port) ||
2269 (aggregator->lag_ports->next_port_in_aggregator)) {
2270 /* find new aggregator for the related port(s) */
2271 bond_for_each_slave(bond, slave_iter, iter) {
2272 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2273 /* if the new aggregator is empty, or it is
2274 * connected to our port only
2275 */
2276 if (!new_aggregator->lag_ports ||
2277 ((new_aggregator->lag_ports == port) &&
2278 !new_aggregator->lag_ports->next_port_in_aggregator))
2279 break;
2280 }
2281 if (!slave_iter)
2282 new_aggregator = NULL;
2283
2284 /* if new aggregator found, copy the aggregator's
2285 * parameters and connect the related lag_ports to the
2286 * new aggregator
2287 */
2288 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2289 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2290 aggregator->aggregator_identifier,
2291 new_aggregator->aggregator_identifier);
2292
2293 if ((new_aggregator->lag_ports == port) &&
2294 new_aggregator->is_active) {
2295 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2296 select_new_active_agg = 1;
2297 }
2298
2299 new_aggregator->is_individual = aggregator->is_individual;
2300 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2301 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2302 new_aggregator->partner_system = aggregator->partner_system;
2303 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2304 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2305 new_aggregator->receive_state = aggregator->receive_state;
2306 new_aggregator->transmit_state = aggregator->transmit_state;
2307 new_aggregator->lag_ports = aggregator->lag_ports;
2308 new_aggregator->is_active = aggregator->is_active;
2309 new_aggregator->num_of_ports = aggregator->num_of_ports;
2310
2311 /* update the information that is written on
2312 * the ports about the aggregator
2313 */
2314 for (temp_port = aggregator->lag_ports; temp_port;
2315 temp_port = temp_port->next_port_in_aggregator) {
2316 temp_port->aggregator = new_aggregator;
2317 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2318 }
2319
2320 ad_clear_agg(aggregator);
2321
2322 if (select_new_active_agg)
2323 ad_agg_selection_logic(__get_first_agg(port),
2324 &dummy_slave_update);
2325 } else {
2326 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2327 }
2328 } else {
2329 /* in case that the only port related to this
2330 * aggregator is the one we want to remove
2331 */
2332 select_new_active_agg = aggregator->is_active;
2333 ad_clear_agg(aggregator);
2334 if (select_new_active_agg) {
2335 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2336 /* select new active aggregator */
2337 temp_aggregator = __get_first_agg(port);
2338 if (temp_aggregator)
2339 ad_agg_selection_logic(temp_aggregator,
2340 &dummy_slave_update);
2341 }
2342 }
2343 }
2344
2345 slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number);
2346
2347 /* find the aggregator that this port is connected to */
2348 bond_for_each_slave(bond, slave_iter, iter) {
2349 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2350 prev_port = NULL;
2351 /* search the port in the aggregator's related ports */
2352 for (temp_port = temp_aggregator->lag_ports; temp_port;
2353 prev_port = temp_port,
2354 temp_port = temp_port->next_port_in_aggregator) {
2355 if (temp_port == port) {
2356 /* the aggregator found - detach the port from
2357 * this aggregator
2358 */
2359 if (prev_port)
2360 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2361 else
2362 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2363 temp_aggregator->num_of_ports--;
2364 if (__agg_active_ports(temp_aggregator) == 0) {
2365 select_new_active_agg = temp_aggregator->is_active;
2366 if (temp_aggregator->num_of_ports == 0)
2367 ad_clear_agg(temp_aggregator);
2368 if (select_new_active_agg) {
2369 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2370 /* select new active aggregator */
2371 ad_agg_selection_logic(__get_first_agg(port),
2372 &dummy_slave_update);
2373 }
2374 }
2375 break;
2376 }
2377 }
2378 }
2379 port->slave = NULL;
2380
2381out:
2382 spin_unlock_bh(&bond->mode_lock);
2383}
2384
2385/**
2386 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2387 * @bond: bonding struct to work on
2388 *
2389 * If an ad_actor setting gets changed we need to update the individual port
2390 * settings so the bond device will use the new values when it gets upped.
2391 */
2392void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2393{
2394 struct list_head *iter;
2395 struct slave *slave;
2396
2397 ASSERT_RTNL();
2398
2399 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2400 if (is_zero_ether_addr(bond->params.ad_actor_system))
2401 BOND_AD_INFO(bond).system.sys_mac_addr =
2402 *((struct mac_addr *)bond->dev->dev_addr);
2403 else
2404 BOND_AD_INFO(bond).system.sys_mac_addr =
2405 *((struct mac_addr *)bond->params.ad_actor_system);
2406
2407 spin_lock_bh(&bond->mode_lock);
2408 bond_for_each_slave(bond, slave, iter) {
2409 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2410
2411 __ad_actor_update_port(port);
2412 port->ntt = true;
2413 }
2414 spin_unlock_bh(&bond->mode_lock);
2415}
2416
2417/**
2418 * bond_agg_timer_advance - advance agg_select_timer
2419 * @bond: bonding structure
2420 *
2421 * Return true when agg_select_timer reaches 0.
2422 */
2423static bool bond_agg_timer_advance(struct bonding *bond)
2424{
2425 int val, nval;
2426
2427 while (1) {
2428 val = atomic_read(&BOND_AD_INFO(bond).agg_select_timer);
2429 if (!val)
2430 return false;
2431 nval = val - 1;
2432 if (atomic_cmpxchg(&BOND_AD_INFO(bond).agg_select_timer,
2433 val, nval) == val)
2434 break;
2435 }
2436 return nval == 0;
2437}
2438
2439/**
2440 * bond_3ad_state_machine_handler - handle state machines timeout
2441 * @work: work context to fetch bonding struct to work on from
2442 *
2443 * The state machine handling concept in this module is to check every tick
2444 * which state machine should operate any function. The execution order is
2445 * round robin, so when we have an interaction between state machines, the
2446 * reply of one to each other might be delayed until next tick.
2447 *
2448 * This function also complete the initialization when the agg_select_timer
2449 * times out, and it selects an aggregator for the ports that are yet not
2450 * related to any aggregator, and selects the active aggregator for a bond.
2451 */
2452void bond_3ad_state_machine_handler(struct work_struct *work)
2453{
2454 struct bonding *bond = container_of(work, struct bonding,
2455 ad_work.work);
2456 struct aggregator *aggregator;
2457 struct list_head *iter;
2458 struct slave *slave;
2459 struct port *port;
2460 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2461 bool update_slave_arr = false;
2462
2463 /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2464 * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2465 * concurrently due to incoming LACPDU as well.
2466 */
2467 spin_lock_bh(&bond->mode_lock);
2468 rcu_read_lock();
2469
2470 /* check if there are any slaves */
2471 if (!bond_has_slaves(bond))
2472 goto re_arm;
2473
2474 if (bond_agg_timer_advance(bond)) {
2475 slave = bond_first_slave_rcu(bond);
2476 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2477
2478 /* select the active aggregator for the bond */
2479 if (port) {
2480 if (!port->slave) {
2481 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2482 bond->dev->name);
2483 goto re_arm;
2484 }
2485
2486 aggregator = __get_first_agg(port);
2487 ad_agg_selection_logic(aggregator, &update_slave_arr);
2488 }
2489 bond_3ad_set_carrier(bond);
2490 }
2491
2492 /* for each port run the state machines */
2493 bond_for_each_slave_rcu(bond, slave, iter) {
2494 port = &(SLAVE_AD_INFO(slave)->port);
2495 if (!port->slave) {
2496 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2497 bond->dev->name);
2498 goto re_arm;
2499 }
2500
2501 ad_rx_machine(NULL, port);
2502 ad_periodic_machine(port, &bond->params);
2503 ad_port_selection_logic(port, &update_slave_arr);
2504 ad_mux_machine(port, &update_slave_arr);
2505 ad_tx_machine(port);
2506 ad_churn_machine(port);
2507
2508 /* turn off the BEGIN bit, since we already handled it */
2509 if (port->sm_vars & AD_PORT_BEGIN)
2510 port->sm_vars &= ~AD_PORT_BEGIN;
2511 }
2512
2513re_arm:
2514 bond_for_each_slave_rcu(bond, slave, iter) {
2515 if (slave->should_notify) {
2516 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2517 break;
2518 }
2519 }
2520 rcu_read_unlock();
2521 spin_unlock_bh(&bond->mode_lock);
2522
2523 if (update_slave_arr)
2524 bond_slave_arr_work_rearm(bond, 0);
2525
2526 if (should_notify_rtnl && rtnl_trylock()) {
2527 bond_slave_state_notify(bond);
2528 rtnl_unlock();
2529 }
2530 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2531}
2532
2533/**
2534 * bond_3ad_rx_indication - handle a received frame
2535 * @lacpdu: received lacpdu
2536 * @slave: slave struct to work on
2537 *
2538 * It is assumed that frames that were sent on this NIC don't returned as new
2539 * received frames (loopback). Since only the payload is given to this
2540 * function, it check for loopback.
2541 */
2542static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave)
2543{
2544 struct bonding *bond = slave->bond;
2545 int ret = RX_HANDLER_ANOTHER;
2546 struct bond_marker *marker;
2547 struct port *port;
2548 atomic64_t *stat;
2549
2550 port = &(SLAVE_AD_INFO(slave)->port);
2551 if (!port->slave) {
2552 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2553 slave->dev->name, slave->bond->dev->name);
2554 return ret;
2555 }
2556
2557 switch (lacpdu->subtype) {
2558 case AD_TYPE_LACPDU:
2559 ret = RX_HANDLER_CONSUMED;
2560 slave_dbg(slave->bond->dev, slave->dev,
2561 "Received LACPDU on port %d\n",
2562 port->actor_port_number);
2563 /* Protect against concurrent state machines */
2564 spin_lock(&slave->bond->mode_lock);
2565 ad_rx_machine(lacpdu, port);
2566 spin_unlock(&slave->bond->mode_lock);
2567 break;
2568 case AD_TYPE_MARKER:
2569 ret = RX_HANDLER_CONSUMED;
2570 /* No need to convert fields to Little Endian since we
2571 * don't use the marker's fields.
2572 */
2573 marker = (struct bond_marker *)lacpdu;
2574 switch (marker->tlv_type) {
2575 case AD_MARKER_INFORMATION_SUBTYPE:
2576 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n",
2577 port->actor_port_number);
2578 ad_marker_info_received(marker, port);
2579 break;
2580 case AD_MARKER_RESPONSE_SUBTYPE:
2581 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n",
2582 port->actor_port_number);
2583 ad_marker_response_received(marker, port);
2584 break;
2585 default:
2586 slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n",
2587 port->actor_port_number);
2588 stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx;
2589 atomic64_inc(stat);
2590 stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx;
2591 atomic64_inc(stat);
2592 }
2593 break;
2594 default:
2595 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx);
2596 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx);
2597 }
2598
2599 return ret;
2600}
2601
2602/**
2603 * ad_update_actor_keys - Update the oper / admin keys for a port based on
2604 * its current speed and duplex settings.
2605 *
2606 * @port: the port we'are looking at
2607 * @reset: Boolean to just reset the speed and the duplex part of the key
2608 *
2609 * The logic to change the oper / admin keys is:
2610 * (a) A full duplex port can participate in LACP with partner.
2611 * (b) When the speed is changed, LACP need to be reinitiated.
2612 */
2613static void ad_update_actor_keys(struct port *port, bool reset)
2614{
2615 u8 duplex = 0;
2616 u16 ospeed = 0, speed = 0;
2617 u16 old_oper_key = port->actor_oper_port_key;
2618
2619 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2620 if (!reset) {
2621 speed = __get_link_speed(port);
2622 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2623 duplex = __get_duplex(port);
2624 port->actor_admin_port_key |= (speed << 1) | duplex;
2625 }
2626 port->actor_oper_port_key = port->actor_admin_port_key;
2627
2628 if (old_oper_key != port->actor_oper_port_key) {
2629 /* Only 'duplex' port participates in LACP */
2630 if (duplex)
2631 port->sm_vars |= AD_PORT_LACP_ENABLED;
2632 else
2633 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2634
2635 if (!reset) {
2636 if (!speed) {
2637 slave_err(port->slave->bond->dev,
2638 port->slave->dev,
2639 "speed changed to 0 on port %d\n",
2640 port->actor_port_number);
2641 } else if (duplex && ospeed != speed) {
2642 /* Speed change restarts LACP state-machine */
2643 port->sm_vars |= AD_PORT_BEGIN;
2644 }
2645 }
2646 }
2647}
2648
2649/**
2650 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2651 * change indication
2652 *
2653 * @slave: slave struct to work on
2654 *
2655 * Handle reselection of aggregator (if needed) for this port.
2656 */
2657void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2658{
2659 struct port *port;
2660
2661 port = &(SLAVE_AD_INFO(slave)->port);
2662
2663 /* if slave is null, the whole port is not initialized */
2664 if (!port->slave) {
2665 slave_warn(slave->bond->dev, slave->dev,
2666 "speed/duplex changed for uninitialized port\n");
2667 return;
2668 }
2669
2670 spin_lock_bh(&slave->bond->mode_lock);
2671 ad_update_actor_keys(port, false);
2672 spin_unlock_bh(&slave->bond->mode_lock);
2673 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n",
2674 port->actor_port_number);
2675}
2676
2677/**
2678 * bond_3ad_handle_link_change - handle a slave's link status change indication
2679 * @slave: slave struct to work on
2680 * @link: whether the link is now up or down
2681 *
2682 * Handle reselection of aggregator (if needed) for this port.
2683 */
2684void bond_3ad_handle_link_change(struct slave *slave, char link)
2685{
2686 struct aggregator *agg;
2687 struct port *port;
2688 bool dummy;
2689
2690 port = &(SLAVE_AD_INFO(slave)->port);
2691
2692 /* if slave is null, the whole port is not initialized */
2693 if (!port->slave) {
2694 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n");
2695 return;
2696 }
2697
2698 spin_lock_bh(&slave->bond->mode_lock);
2699 /* on link down we are zeroing duplex and speed since
2700 * some of the adaptors(ce1000.lan) report full duplex/speed
2701 * instead of N/A(duplex) / 0(speed).
2702 *
2703 * on link up we are forcing recheck on the duplex and speed since
2704 * some of he adaptors(ce1000.lan) report.
2705 */
2706 if (link == BOND_LINK_UP) {
2707 port->is_enabled = true;
2708 ad_update_actor_keys(port, false);
2709 } else {
2710 /* link has failed */
2711 port->is_enabled = false;
2712 ad_update_actor_keys(port, true);
2713 }
2714 agg = __get_first_agg(port);
2715 ad_agg_selection_logic(agg, &dummy);
2716
2717 spin_unlock_bh(&slave->bond->mode_lock);
2718
2719 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n",
2720 port->actor_port_number,
2721 link == BOND_LINK_UP ? "UP" : "DOWN");
2722
2723 /* RTNL is held and mode_lock is released so it's safe
2724 * to update slave_array here.
2725 */
2726 bond_update_slave_arr(slave->bond, NULL);
2727}
2728
2729/**
2730 * bond_3ad_set_carrier - set link state for bonding master
2731 * @bond: bonding structure
2732 *
2733 * if we have an active aggregator, we're up, if not, we're down.
2734 * Presumes that we cannot have an active aggregator if there are
2735 * no slaves with link up.
2736 *
2737 * This behavior complies with IEEE 802.3 section 43.3.9.
2738 *
2739 * Called by bond_set_carrier(). Return zero if carrier state does not
2740 * change, nonzero if it does.
2741 */
2742int bond_3ad_set_carrier(struct bonding *bond)
2743{
2744 struct aggregator *active;
2745 struct slave *first_slave;
2746 int ret = 1;
2747
2748 rcu_read_lock();
2749 first_slave = bond_first_slave_rcu(bond);
2750 if (!first_slave) {
2751 ret = 0;
2752 goto out;
2753 }
2754 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2755 if (active) {
2756 /* are enough slaves available to consider link up? */
2757 if (__agg_active_ports(active) < bond->params.min_links) {
2758 if (netif_carrier_ok(bond->dev)) {
2759 netif_carrier_off(bond->dev);
2760 goto out;
2761 }
2762 } else if (!netif_carrier_ok(bond->dev)) {
2763 netif_carrier_on(bond->dev);
2764 goto out;
2765 }
2766 } else if (netif_carrier_ok(bond->dev)) {
2767 netif_carrier_off(bond->dev);
2768 }
2769out:
2770 rcu_read_unlock();
2771 return ret;
2772}
2773
2774/**
2775 * __bond_3ad_get_active_agg_info - get information of the active aggregator
2776 * @bond: bonding struct to work on
2777 * @ad_info: ad_info struct to fill with the bond's info
2778 *
2779 * Returns: 0 on success
2780 * < 0 on error
2781 */
2782int __bond_3ad_get_active_agg_info(struct bonding *bond,
2783 struct ad_info *ad_info)
2784{
2785 struct aggregator *aggregator = NULL;
2786 struct list_head *iter;
2787 struct slave *slave;
2788 struct port *port;
2789
2790 bond_for_each_slave_rcu(bond, slave, iter) {
2791 port = &(SLAVE_AD_INFO(slave)->port);
2792 if (port->aggregator && port->aggregator->is_active) {
2793 aggregator = port->aggregator;
2794 break;
2795 }
2796 }
2797
2798 if (!aggregator)
2799 return -1;
2800
2801 ad_info->aggregator_id = aggregator->aggregator_identifier;
2802 ad_info->ports = __agg_active_ports(aggregator);
2803 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2804 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2805 ether_addr_copy(ad_info->partner_system,
2806 aggregator->partner_system.mac_addr_value);
2807 return 0;
2808}
2809
2810int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2811{
2812 int ret;
2813
2814 rcu_read_lock();
2815 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2816 rcu_read_unlock();
2817
2818 return ret;
2819}
2820
2821int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2822 struct slave *slave)
2823{
2824 struct lacpdu *lacpdu, _lacpdu;
2825
2826 if (skb->protocol != PKT_TYPE_LACPDU)
2827 return RX_HANDLER_ANOTHER;
2828
2829 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2830 return RX_HANDLER_ANOTHER;
2831
2832 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2833 if (!lacpdu) {
2834 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx);
2835 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx);
2836 return RX_HANDLER_ANOTHER;
2837 }
2838
2839 return bond_3ad_rx_indication(lacpdu, slave);
2840}
2841
2842/**
2843 * bond_3ad_update_lacp_rate - change the lacp rate
2844 * @bond: bonding struct
2845 *
2846 * When modify lacp_rate parameter via sysfs,
2847 * update actor_oper_port_state of each port.
2848 *
2849 * Hold bond->mode_lock,
2850 * so we can modify port->actor_oper_port_state,
2851 * no matter bond is up or down.
2852 */
2853void bond_3ad_update_lacp_rate(struct bonding *bond)
2854{
2855 struct port *port = NULL;
2856 struct list_head *iter;
2857 struct slave *slave;
2858 int lacp_fast;
2859
2860 lacp_fast = bond->params.lacp_fast;
2861 spin_lock_bh(&bond->mode_lock);
2862 bond_for_each_slave(bond, slave, iter) {
2863 port = &(SLAVE_AD_INFO(slave)->port);
2864 if (lacp_fast)
2865 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
2866 else
2867 port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT;
2868 }
2869 spin_unlock_bh(&bond->mode_lock);
2870}
2871
2872size_t bond_3ad_stats_size(void)
2873{
2874 return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */
2875 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */
2876 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */
2877 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */
2878 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */
2879 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */
2880 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */
2881 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */
2882 nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */
2883}
2884
2885int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats)
2886{
2887 u64 val;
2888
2889 val = atomic64_read(&stats->lacpdu_rx);
2890 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val,
2891 BOND_3AD_STAT_PAD))
2892 return -EMSGSIZE;
2893 val = atomic64_read(&stats->lacpdu_tx);
2894 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val,
2895 BOND_3AD_STAT_PAD))
2896 return -EMSGSIZE;
2897 val = atomic64_read(&stats->lacpdu_unknown_rx);
2898 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val,
2899 BOND_3AD_STAT_PAD))
2900 return -EMSGSIZE;
2901 val = atomic64_read(&stats->lacpdu_illegal_rx);
2902 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val,
2903 BOND_3AD_STAT_PAD))
2904 return -EMSGSIZE;
2905
2906 val = atomic64_read(&stats->marker_rx);
2907 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val,
2908 BOND_3AD_STAT_PAD))
2909 return -EMSGSIZE;
2910 val = atomic64_read(&stats->marker_tx);
2911 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val,
2912 BOND_3AD_STAT_PAD))
2913 return -EMSGSIZE;
2914 val = atomic64_read(&stats->marker_resp_rx);
2915 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val,
2916 BOND_3AD_STAT_PAD))
2917 return -EMSGSIZE;
2918 val = atomic64_read(&stats->marker_resp_tx);
2919 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val,
2920 BOND_3AD_STAT_PAD))
2921 return -EMSGSIZE;
2922 val = atomic64_read(&stats->marker_unknown_rx);
2923 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val,
2924 BOND_3AD_STAT_PAD))
2925 return -EMSGSIZE;
2926
2927 return 0;
2928}
1/*
2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; either version 2 of the License, or (at your option)
7 * any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59
16 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 */
22
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/skbuff.h>
26#include <linux/if_ether.h>
27#include <linux/netdevice.h>
28#include <linux/spinlock.h>
29#include <linux/ethtool.h>
30#include <linux/etherdevice.h>
31#include <linux/if_bonding.h>
32#include <linux/pkt_sched.h>
33#include <net/net_namespace.h>
34#include "bonding.h"
35#include "bond_3ad.h"
36
37// General definitions
38#define AD_SHORT_TIMEOUT 1
39#define AD_LONG_TIMEOUT 0
40#define AD_STANDBY 0x2
41#define AD_MAX_TX_IN_SECOND 3
42#define AD_COLLECTOR_MAX_DELAY 0
43
44// Timer definitions(43.4.4 in the 802.3ad standard)
45#define AD_FAST_PERIODIC_TIME 1
46#define AD_SLOW_PERIODIC_TIME 30
47#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
48#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
49#define AD_CHURN_DETECTION_TIME 60
50#define AD_AGGREGATE_WAIT_TIME 2
51
52// Port state definitions(43.4.2.2 in the 802.3ad standard)
53#define AD_STATE_LACP_ACTIVITY 0x1
54#define AD_STATE_LACP_TIMEOUT 0x2
55#define AD_STATE_AGGREGATION 0x4
56#define AD_STATE_SYNCHRONIZATION 0x8
57#define AD_STATE_COLLECTING 0x10
58#define AD_STATE_DISTRIBUTING 0x20
59#define AD_STATE_DEFAULTED 0x40
60#define AD_STATE_EXPIRED 0x80
61
62// Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
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
74// Port Key definitions
75// key is determined according to the link speed, duplex and
76// user key(which is yet not supported)
77// ------------------------------------------------------------
78// Port key : | User key | Speed |Duplex|
79// ------------------------------------------------------------
80// 16 6 1 0
81#define AD_DUPLEX_KEY_BITS 0x1
82#define AD_SPEED_KEY_BITS 0x3E
83#define AD_USER_KEY_BITS 0xFFC0
84
85//dalloun
86#define AD_LINK_SPEED_BITMASK_1MBPS 0x1
87#define AD_LINK_SPEED_BITMASK_10MBPS 0x2
88#define AD_LINK_SPEED_BITMASK_100MBPS 0x4
89#define AD_LINK_SPEED_BITMASK_1000MBPS 0x8
90#define AD_LINK_SPEED_BITMASK_10000MBPS 0x10
91//endalloun
92
93// compare MAC addresses
94#define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
95
96static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
97static u16 ad_ticks_per_sec;
98static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
99
100static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
101
102// ================= main 802.3ad protocol functions ==================
103static int ad_lacpdu_send(struct port *port);
104static int ad_marker_send(struct port *port, struct bond_marker *marker);
105static void ad_mux_machine(struct port *port);
106static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
107static void ad_tx_machine(struct port *port);
108static void ad_periodic_machine(struct port *port);
109static void ad_port_selection_logic(struct port *port);
110static void ad_agg_selection_logic(struct aggregator *aggregator);
111static void ad_clear_agg(struct aggregator *aggregator);
112static void ad_initialize_agg(struct aggregator *aggregator);
113static void ad_initialize_port(struct port *port, int lacp_fast);
114static void ad_enable_collecting_distributing(struct port *port);
115static void ad_disable_collecting_distributing(struct port *port);
116static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
117static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
118
119
120/////////////////////////////////////////////////////////////////////////////////
121// ================= api to bonding and kernel code ==================
122/////////////////////////////////////////////////////////////////////////////////
123
124/**
125 * __get_bond_by_port - get the port's bonding struct
126 * @port: the port we're looking at
127 *
128 * Return @port's bonding struct, or %NULL if it can't be found.
129 */
130static inline struct bonding *__get_bond_by_port(struct port *port)
131{
132 if (port->slave == NULL)
133 return NULL;
134
135 return bond_get_bond_by_slave(port->slave);
136}
137
138/**
139 * __get_first_port - get the first port in the bond
140 * @bond: the bond we're looking at
141 *
142 * Return the port of the first slave in @bond, or %NULL if it can't be found.
143 */
144static inline struct port *__get_first_port(struct bonding *bond)
145{
146 if (bond->slave_cnt == 0)
147 return NULL;
148
149 return &(SLAVE_AD_INFO(bond->first_slave).port);
150}
151
152/**
153 * __get_next_port - get the next port in the bond
154 * @port: the port we're looking at
155 *
156 * Return the port of the slave that is next in line of @port's slave in the
157 * bond, or %NULL if it can't be found.
158 */
159static inline struct port *__get_next_port(struct port *port)
160{
161 struct bonding *bond = __get_bond_by_port(port);
162 struct slave *slave = port->slave;
163
164 // If there's no bond for this port, or this is the last slave
165 if ((bond == NULL) || (slave->next == bond->first_slave))
166 return NULL;
167
168 return &(SLAVE_AD_INFO(slave->next).port);
169}
170
171/**
172 * __get_first_agg - get the first aggregator in the bond
173 * @bond: the bond we're looking at
174 *
175 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
176 * found.
177 */
178static inline struct aggregator *__get_first_agg(struct port *port)
179{
180 struct bonding *bond = __get_bond_by_port(port);
181
182 // If there's no bond for this port, or bond has no slaves
183 if ((bond == NULL) || (bond->slave_cnt == 0))
184 return NULL;
185
186 return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
187}
188
189/**
190 * __get_next_agg - get the next aggregator in the bond
191 * @aggregator: the aggregator we're looking at
192 *
193 * Return the aggregator of the slave that is next in line of @aggregator's
194 * slave in the bond, or %NULL if it can't be found.
195 */
196static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
197{
198 struct slave *slave = aggregator->slave;
199 struct bonding *bond = bond_get_bond_by_slave(slave);
200
201 // If there's no bond for this aggregator, or this is the last slave
202 if ((bond == NULL) || (slave->next == bond->first_slave))
203 return NULL;
204
205 return &(SLAVE_AD_INFO(slave->next).aggregator);
206}
207
208/*
209 * __agg_has_partner
210 *
211 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
212 * address for the partner). Return 0 if not.
213 */
214static inline int __agg_has_partner(struct aggregator *agg)
215{
216 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
217}
218
219/**
220 * __disable_port - disable the port's slave
221 * @port: the port we're looking at
222 *
223 */
224static inline void __disable_port(struct port *port)
225{
226 bond_set_slave_inactive_flags(port->slave);
227}
228
229/**
230 * __enable_port - enable the port's slave, if it's up
231 * @port: the port we're looking at
232 *
233 */
234static inline void __enable_port(struct port *port)
235{
236 struct slave *slave = port->slave;
237
238 if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
239 bond_set_slave_active_flags(slave);
240}
241
242/**
243 * __port_is_enabled - check if the port's slave is in active state
244 * @port: the port we're looking at
245 *
246 */
247static inline int __port_is_enabled(struct port *port)
248{
249 return bond_is_active_slave(port->slave);
250}
251
252/**
253 * __get_agg_selection_mode - get the aggregator selection mode
254 * @port: the port we're looking at
255 *
256 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
257 */
258static inline u32 __get_agg_selection_mode(struct port *port)
259{
260 struct bonding *bond = __get_bond_by_port(port);
261
262 if (bond == NULL)
263 return BOND_AD_STABLE;
264
265 return bond->params.ad_select;
266}
267
268/**
269 * __check_agg_selection_timer - check if the selection timer has expired
270 * @port: the port we're looking at
271 *
272 */
273static inline int __check_agg_selection_timer(struct port *port)
274{
275 struct bonding *bond = __get_bond_by_port(port);
276
277 if (bond == NULL)
278 return 0;
279
280 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
281}
282
283/**
284 * __get_state_machine_lock - lock the port's state machines
285 * @port: the port we're looking at
286 *
287 */
288static inline void __get_state_machine_lock(struct port *port)
289{
290 spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
291}
292
293/**
294 * __release_state_machine_lock - unlock the port's state machines
295 * @port: the port we're looking at
296 *
297 */
298static inline void __release_state_machine_lock(struct port *port)
299{
300 spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
301}
302
303/**
304 * __get_link_speed - get a port's speed
305 * @port: the port we're looking at
306 *
307 * Return @port's speed in 802.3ad bitmask format. i.e. one of:
308 * 0,
309 * %AD_LINK_SPEED_BITMASK_10MBPS,
310 * %AD_LINK_SPEED_BITMASK_100MBPS,
311 * %AD_LINK_SPEED_BITMASK_1000MBPS,
312 * %AD_LINK_SPEED_BITMASK_10000MBPS
313 */
314static u16 __get_link_speed(struct port *port)
315{
316 struct slave *slave = port->slave;
317 u16 speed;
318
319 /* this if covers only a special case: when the configuration starts with
320 * link down, it sets the speed to 0.
321 * This is done in spite of the fact that the e100 driver reports 0 to be
322 * compatible with MVT in the future.*/
323 if (slave->link != BOND_LINK_UP)
324 speed = 0;
325 else {
326 switch (slave->speed) {
327 case SPEED_10:
328 speed = AD_LINK_SPEED_BITMASK_10MBPS;
329 break;
330
331 case SPEED_100:
332 speed = AD_LINK_SPEED_BITMASK_100MBPS;
333 break;
334
335 case SPEED_1000:
336 speed = AD_LINK_SPEED_BITMASK_1000MBPS;
337 break;
338
339 case SPEED_10000:
340 speed = AD_LINK_SPEED_BITMASK_10000MBPS;
341 break;
342
343 default:
344 speed = 0; // unknown speed value from ethtool. shouldn't happen
345 break;
346 }
347 }
348
349 pr_debug("Port %d Received link speed %d update from adapter\n",
350 port->actor_port_number, speed);
351 return speed;
352}
353
354/**
355 * __get_duplex - get a port's duplex
356 * @port: the port we're looking at
357 *
358 * Return @port's duplex in 802.3ad bitmask format. i.e.:
359 * 0x01 if in full duplex
360 * 0x00 otherwise
361 */
362static u8 __get_duplex(struct port *port)
363{
364 struct slave *slave = port->slave;
365
366 u8 retval;
367
368 // handling a special case: when the configuration starts with
369 // link down, it sets the duplex to 0.
370 if (slave->link != BOND_LINK_UP)
371 retval = 0x0;
372 else {
373 switch (slave->duplex) {
374 case DUPLEX_FULL:
375 retval = 0x1;
376 pr_debug("Port %d Received status full duplex update from adapter\n",
377 port->actor_port_number);
378 break;
379 case DUPLEX_HALF:
380 default:
381 retval = 0x0;
382 pr_debug("Port %d Received status NOT full duplex update from adapter\n",
383 port->actor_port_number);
384 break;
385 }
386 }
387 return retval;
388}
389
390/**
391 * __initialize_port_locks - initialize a port's STATE machine spinlock
392 * @port: the port we're looking at
393 *
394 */
395static inline void __initialize_port_locks(struct port *port)
396{
397 // make sure it isn't called twice
398 spin_lock_init(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
399}
400
401//conversions
402
403/**
404 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
405 * @timer_type: which timer to operate
406 * @par: timer parameter. see below
407 *
408 * If @timer_type is %current_while_timer, @par indicates long/short timer.
409 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
410 * %SLOW_PERIODIC_TIME.
411 */
412static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
413{
414 u16 retval = 0; /* to silence the compiler */
415
416 switch (timer_type) {
417 case AD_CURRENT_WHILE_TIMER: // for rx machine usage
418 if (par)
419 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
420 else
421 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
422 break;
423 case AD_ACTOR_CHURN_TIMER: // for local churn machine
424 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
425 break;
426 case AD_PERIODIC_TIMER: // for periodic machine
427 retval = (par*ad_ticks_per_sec); // long timeout
428 break;
429 case AD_PARTNER_CHURN_TIMER: // for remote churn machine
430 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
431 break;
432 case AD_WAIT_WHILE_TIMER: // for selection machine
433 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
434 break;
435 }
436 return retval;
437}
438
439
440/////////////////////////////////////////////////////////////////////////////////
441// ================= ad_rx_machine helper functions ==================
442/////////////////////////////////////////////////////////////////////////////////
443
444/**
445 * __choose_matched - update a port's matched variable from a received lacpdu
446 * @lacpdu: the lacpdu we've received
447 * @port: the port we're looking at
448 *
449 * Update the value of the matched variable, using parameter values from a
450 * newly received lacpdu. Parameter values for the partner carried in the
451 * received PDU are compared with the corresponding operational parameter
452 * values for the actor. Matched is set to TRUE if all of these parameters
453 * match and the PDU parameter partner_state.aggregation has the same value as
454 * actor_oper_port_state.aggregation and lacp will actively maintain the link
455 * in the aggregation. Matched is also set to TRUE if the value of
456 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
457 * an individual link and lacp will actively maintain the link. Otherwise,
458 * matched is set to FALSE. LACP is considered to be actively maintaining the
459 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
460 * the actor's actor_oper_port_state.lacp_activity and the PDU's
461 * partner_state.lacp_activity variables are TRUE.
462 *
463 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
464 * used here to implement the language from 802.3ad 43.4.9 that requires
465 * recordPDU to "match" the LACPDU parameters to the stored values.
466 */
467static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
468{
469 // check if all parameters are alike
470 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
471 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
472 !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
473 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
474 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
475 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
476 // or this is individual link(aggregation == FALSE)
477 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
478 ) {
479 // update the state machine Matched variable
480 port->sm_vars |= AD_PORT_MATCHED;
481 } else {
482 port->sm_vars &= ~AD_PORT_MATCHED;
483 }
484}
485
486/**
487 * __record_pdu - record parameters from a received lacpdu
488 * @lacpdu: the lacpdu we've received
489 * @port: the port we're looking at
490 *
491 * Record the parameter values for the Actor carried in a received lacpdu as
492 * the current partner operational parameter values and sets
493 * actor_oper_port_state.defaulted to FALSE.
494 */
495static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
496{
497 if (lacpdu && port) {
498 struct port_params *partner = &port->partner_oper;
499
500 __choose_matched(lacpdu, port);
501 // record the new parameter values for the partner operational
502 partner->port_number = ntohs(lacpdu->actor_port);
503 partner->port_priority = ntohs(lacpdu->actor_port_priority);
504 partner->system = lacpdu->actor_system;
505 partner->system_priority = ntohs(lacpdu->actor_system_priority);
506 partner->key = ntohs(lacpdu->actor_key);
507 partner->port_state = lacpdu->actor_state;
508
509 // set actor_oper_port_state.defaulted to FALSE
510 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
511
512 // set the partner sync. to on if the partner is sync. and the port is matched
513 if ((port->sm_vars & AD_PORT_MATCHED)
514 && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
515 partner->port_state |= AD_STATE_SYNCHRONIZATION;
516 else
517 partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
518 }
519}
520
521/**
522 * __record_default - record default parameters
523 * @port: the port we're looking at
524 *
525 * This function records the default parameter values for the partner carried
526 * in the Partner Admin parameters as the current partner operational parameter
527 * values and sets actor_oper_port_state.defaulted to TRUE.
528 */
529static void __record_default(struct port *port)
530{
531 if (port) {
532 // record the partner admin parameters
533 memcpy(&port->partner_oper, &port->partner_admin,
534 sizeof(struct port_params));
535
536 // set actor_oper_port_state.defaulted to true
537 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
538 }
539}
540
541/**
542 * __update_selected - update a port's Selected variable from a received lacpdu
543 * @lacpdu: the lacpdu we've received
544 * @port: the port we're looking at
545 *
546 * Update the value of the selected variable, using parameter values from a
547 * newly received lacpdu. The parameter values for the Actor carried in the
548 * received PDU are compared with the corresponding operational parameter
549 * values for the ports partner. If one or more of the comparisons shows that
550 * the value(s) received in the PDU differ from the current operational values,
551 * then selected is set to FALSE and actor_oper_port_state.synchronization is
552 * set to out_of_sync. Otherwise, selected remains unchanged.
553 */
554static void __update_selected(struct lacpdu *lacpdu, struct port *port)
555{
556 if (lacpdu && port) {
557 const struct port_params *partner = &port->partner_oper;
558
559 // check if any parameter is different
560 if (ntohs(lacpdu->actor_port) != partner->port_number ||
561 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
562 MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system) ||
563 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
564 ntohs(lacpdu->actor_key) != partner->key ||
565 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
566 // update the state machine Selected variable
567 port->sm_vars &= ~AD_PORT_SELECTED;
568 }
569 }
570}
571
572/**
573 * __update_default_selected - update a port's Selected variable from Partner
574 * @port: the port we're looking at
575 *
576 * This function updates the value of the selected variable, using the partner
577 * administrative parameter values. The administrative values are compared with
578 * the corresponding operational parameter values for the partner. If one or
579 * more of the comparisons shows that the administrative value(s) differ from
580 * the current operational values, then Selected is set to FALSE and
581 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
582 * Selected remains unchanged.
583 */
584static void __update_default_selected(struct port *port)
585{
586 if (port) {
587 const struct port_params *admin = &port->partner_admin;
588 const struct port_params *oper = &port->partner_oper;
589
590 // check if any parameter is different
591 if (admin->port_number != oper->port_number ||
592 admin->port_priority != oper->port_priority ||
593 MAC_ADDRESS_COMPARE(&admin->system, &oper->system) ||
594 admin->system_priority != oper->system_priority ||
595 admin->key != oper->key ||
596 (admin->port_state & AD_STATE_AGGREGATION)
597 != (oper->port_state & AD_STATE_AGGREGATION)) {
598 // update the state machine Selected variable
599 port->sm_vars &= ~AD_PORT_SELECTED;
600 }
601 }
602}
603
604/**
605 * __update_ntt - update a port's ntt variable from a received lacpdu
606 * @lacpdu: the lacpdu we've received
607 * @port: the port we're looking at
608 *
609 * Updates the value of the ntt variable, using parameter values from a newly
610 * received lacpdu. The parameter values for the partner carried in the
611 * received PDU are compared with the corresponding operational parameter
612 * values for the Actor. If one or more of the comparisons shows that the
613 * value(s) received in the PDU differ from the current operational values,
614 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
615 */
616static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
617{
618 // validate lacpdu and port
619 if (lacpdu && port) {
620 // check if any parameter is different
621 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
622 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
623 MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
624 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
625 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
626 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
627 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
628 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
629 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
630 ) {
631
632 port->ntt = true;
633 }
634 }
635}
636
637/**
638 * __attach_bond_to_agg
639 * @port: the port we're looking at
640 *
641 * Handle the attaching of the port's control parser/multiplexer and the
642 * aggregator. This function does nothing since the parser/multiplexer of the
643 * receive and the parser/multiplexer of the aggregator are already combined.
644 */
645static void __attach_bond_to_agg(struct port *port)
646{
647 port = NULL; /* just to satisfy the compiler */
648 // This function does nothing since the parser/multiplexer of the receive
649 // and the parser/multiplexer of the aggregator are already combined
650}
651
652/**
653 * __detach_bond_from_agg
654 * @port: the port we're looking at
655 *
656 * Handle the detaching of the port's control parser/multiplexer from the
657 * aggregator. This function does nothing since the parser/multiplexer of the
658 * receive and the parser/multiplexer of the aggregator are already combined.
659 */
660static void __detach_bond_from_agg(struct port *port)
661{
662 port = NULL; /* just to satisfy the compiler */
663 // This function does nothing since the parser/multiplexer of the receive
664 // and the parser/multiplexer of the aggregator are already combined
665}
666
667/**
668 * __agg_ports_are_ready - check if all ports in an aggregator are ready
669 * @aggregator: the aggregator we're looking at
670 *
671 */
672static int __agg_ports_are_ready(struct aggregator *aggregator)
673{
674 struct port *port;
675 int retval = 1;
676
677 if (aggregator) {
678 // scan all ports in this aggregator to verfy if they are all ready
679 for (port = aggregator->lag_ports;
680 port;
681 port = port->next_port_in_aggregator) {
682 if (!(port->sm_vars & AD_PORT_READY_N)) {
683 retval = 0;
684 break;
685 }
686 }
687 }
688
689 return retval;
690}
691
692/**
693 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
694 * @aggregator: the aggregator we're looking at
695 * @val: Should the ports' ready bit be set on or off
696 *
697 */
698static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
699{
700 struct port *port;
701
702 for (port = aggregator->lag_ports; port;
703 port = port->next_port_in_aggregator) {
704 if (val)
705 port->sm_vars |= AD_PORT_READY;
706 else
707 port->sm_vars &= ~AD_PORT_READY;
708 }
709}
710
711/**
712 * __get_agg_bandwidth - get the total bandwidth of an aggregator
713 * @aggregator: the aggregator we're looking at
714 *
715 */
716static u32 __get_agg_bandwidth(struct aggregator *aggregator)
717{
718 u32 bandwidth = 0;
719
720 if (aggregator->num_of_ports) {
721 switch (__get_link_speed(aggregator->lag_ports)) {
722 case AD_LINK_SPEED_BITMASK_1MBPS:
723 bandwidth = aggregator->num_of_ports;
724 break;
725 case AD_LINK_SPEED_BITMASK_10MBPS:
726 bandwidth = aggregator->num_of_ports * 10;
727 break;
728 case AD_LINK_SPEED_BITMASK_100MBPS:
729 bandwidth = aggregator->num_of_ports * 100;
730 break;
731 case AD_LINK_SPEED_BITMASK_1000MBPS:
732 bandwidth = aggregator->num_of_ports * 1000;
733 break;
734 case AD_LINK_SPEED_BITMASK_10000MBPS:
735 bandwidth = aggregator->num_of_ports * 10000;
736 break;
737 default:
738 bandwidth = 0; /*to silence the compiler ....*/
739 }
740 }
741 return bandwidth;
742}
743
744/**
745 * __get_active_agg - get the current active aggregator
746 * @aggregator: the aggregator we're looking at
747 *
748 */
749static struct aggregator *__get_active_agg(struct aggregator *aggregator)
750{
751 struct aggregator *retval = NULL;
752
753 for (; aggregator; aggregator = __get_next_agg(aggregator)) {
754 if (aggregator->is_active) {
755 retval = aggregator;
756 break;
757 }
758 }
759
760 return retval;
761}
762
763/**
764 * __update_lacpdu_from_port - update a port's lacpdu fields
765 * @port: the port we're looking at
766 *
767 */
768static inline void __update_lacpdu_from_port(struct port *port)
769{
770 struct lacpdu *lacpdu = &port->lacpdu;
771 const struct port_params *partner = &port->partner_oper;
772
773 /* update current actual Actor parameters */
774 /* lacpdu->subtype initialized
775 * lacpdu->version_number initialized
776 * lacpdu->tlv_type_actor_info initialized
777 * lacpdu->actor_information_length initialized
778 */
779
780 lacpdu->actor_system_priority = htons(port->actor_system_priority);
781 lacpdu->actor_system = port->actor_system;
782 lacpdu->actor_key = htons(port->actor_oper_port_key);
783 lacpdu->actor_port_priority = htons(port->actor_port_priority);
784 lacpdu->actor_port = htons(port->actor_port_number);
785 lacpdu->actor_state = port->actor_oper_port_state;
786
787 /* lacpdu->reserved_3_1 initialized
788 * lacpdu->tlv_type_partner_info initialized
789 * lacpdu->partner_information_length initialized
790 */
791
792 lacpdu->partner_system_priority = htons(partner->system_priority);
793 lacpdu->partner_system = partner->system;
794 lacpdu->partner_key = htons(partner->key);
795 lacpdu->partner_port_priority = htons(partner->port_priority);
796 lacpdu->partner_port = htons(partner->port_number);
797 lacpdu->partner_state = partner->port_state;
798
799 /* lacpdu->reserved_3_2 initialized
800 * lacpdu->tlv_type_collector_info initialized
801 * lacpdu->collector_information_length initialized
802 * collector_max_delay initialized
803 * reserved_12[12] initialized
804 * tlv_type_terminator initialized
805 * terminator_length initialized
806 * reserved_50[50] initialized
807 */
808}
809
810//////////////////////////////////////////////////////////////////////////////////////
811// ================= main 802.3ad protocol code ======================================
812//////////////////////////////////////////////////////////////////////////////////////
813
814/**
815 * ad_lacpdu_send - send out a lacpdu packet on a given port
816 * @port: the port we're looking at
817 *
818 * Returns: 0 on success
819 * < 0 on error
820 */
821static int ad_lacpdu_send(struct port *port)
822{
823 struct slave *slave = port->slave;
824 struct sk_buff *skb;
825 struct lacpdu_header *lacpdu_header;
826 int length = sizeof(struct lacpdu_header);
827
828 skb = dev_alloc_skb(length);
829 if (!skb)
830 return -ENOMEM;
831
832 skb->dev = slave->dev;
833 skb_reset_mac_header(skb);
834 skb->network_header = skb->mac_header + ETH_HLEN;
835 skb->protocol = PKT_TYPE_LACPDU;
836 skb->priority = TC_PRIO_CONTROL;
837
838 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
839
840 memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
841 /* Note: source address is set to be the member's PERMANENT address,
842 because we use it to identify loopback lacpdus in receive. */
843 memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
844 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
845
846 lacpdu_header->lacpdu = port->lacpdu; // struct copy
847
848 dev_queue_xmit(skb);
849
850 return 0;
851}
852
853/**
854 * ad_marker_send - send marker information/response on a given port
855 * @port: the port we're looking at
856 * @marker: marker data to send
857 *
858 * Returns: 0 on success
859 * < 0 on error
860 */
861static int ad_marker_send(struct port *port, struct bond_marker *marker)
862{
863 struct slave *slave = port->slave;
864 struct sk_buff *skb;
865 struct bond_marker_header *marker_header;
866 int length = sizeof(struct bond_marker_header);
867
868 skb = dev_alloc_skb(length + 16);
869 if (!skb)
870 return -ENOMEM;
871
872 skb_reserve(skb, 16);
873
874 skb->dev = slave->dev;
875 skb_reset_mac_header(skb);
876 skb->network_header = skb->mac_header + ETH_HLEN;
877 skb->protocol = PKT_TYPE_LACPDU;
878
879 marker_header = (struct bond_marker_header *)skb_put(skb, length);
880
881 memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
882 /* Note: source address is set to be the member's PERMANENT address,
883 because we use it to identify loopback MARKERs in receive. */
884 memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
885 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
886
887 marker_header->marker = *marker; // struct copy
888
889 dev_queue_xmit(skb);
890
891 return 0;
892}
893
894/**
895 * ad_mux_machine - handle a port's mux state machine
896 * @port: the port we're looking at
897 *
898 */
899static void ad_mux_machine(struct port *port)
900{
901 mux_states_t last_state;
902
903 // keep current State Machine state to compare later if it was changed
904 last_state = port->sm_mux_state;
905
906 if (port->sm_vars & AD_PORT_BEGIN) {
907 port->sm_mux_state = AD_MUX_DETACHED; // next state
908 } else {
909 switch (port->sm_mux_state) {
910 case AD_MUX_DETACHED:
911 if ((port->sm_vars & AD_PORT_SELECTED)
912 || (port->sm_vars & AD_PORT_STANDBY))
913 /* if SELECTED or STANDBY */
914 port->sm_mux_state = AD_MUX_WAITING; // next state
915 break;
916 case AD_MUX_WAITING:
917 // if SELECTED == FALSE return to DETACH state
918 if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
919 port->sm_vars &= ~AD_PORT_READY_N;
920 // in order to withhold the Selection Logic to check all ports READY_N value
921 // every callback cycle to update ready variable, we check READY_N and update READY here
922 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
923 port->sm_mux_state = AD_MUX_DETACHED; // next state
924 break;
925 }
926
927 // check if the wait_while_timer expired
928 if (port->sm_mux_timer_counter
929 && !(--port->sm_mux_timer_counter))
930 port->sm_vars |= AD_PORT_READY_N;
931
932 // in order to withhold the selection logic to check all ports READY_N value
933 // every callback cycle to update ready variable, we check READY_N and update READY here
934 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
935
936 // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
937 if ((port->sm_vars & AD_PORT_READY)
938 && !port->sm_mux_timer_counter)
939 port->sm_mux_state = AD_MUX_ATTACHED; // next state
940 break;
941 case AD_MUX_ATTACHED:
942 // check also if agg_select_timer expired(so the edable port will take place only after this timer)
943 if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
944 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
945 } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if UNSELECTED or STANDBY
946 port->sm_vars &= ~AD_PORT_READY_N;
947 // in order to withhold the selection logic to check all ports READY_N value
948 // every callback cycle to update ready variable, we check READY_N and update READY here
949 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
950 port->sm_mux_state = AD_MUX_DETACHED;// next state
951 }
952 break;
953 case AD_MUX_COLLECTING_DISTRIBUTING:
954 if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
955 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
956 ) {
957 port->sm_mux_state = AD_MUX_ATTACHED;// next state
958
959 } else {
960 // if port state hasn't changed make
961 // sure that a collecting distributing
962 // port in an active aggregator is enabled
963 if (port->aggregator &&
964 port->aggregator->is_active &&
965 !__port_is_enabled(port)) {
966
967 __enable_port(port);
968 }
969 }
970 break;
971 default: //to silence the compiler
972 break;
973 }
974 }
975
976 // check if the state machine was changed
977 if (port->sm_mux_state != last_state) {
978 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
979 port->actor_port_number, last_state,
980 port->sm_mux_state);
981 switch (port->sm_mux_state) {
982 case AD_MUX_DETACHED:
983 __detach_bond_from_agg(port);
984 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
985 ad_disable_collecting_distributing(port);
986 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
987 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
988 port->ntt = true;
989 break;
990 case AD_MUX_WAITING:
991 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
992 break;
993 case AD_MUX_ATTACHED:
994 __attach_bond_to_agg(port);
995 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
996 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
997 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
998 ad_disable_collecting_distributing(port);
999 port->ntt = true;
1000 break;
1001 case AD_MUX_COLLECTING_DISTRIBUTING:
1002 port->actor_oper_port_state |= AD_STATE_COLLECTING;
1003 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1004 ad_enable_collecting_distributing(port);
1005 port->ntt = true;
1006 break;
1007 default: //to silence the compiler
1008 break;
1009 }
1010 }
1011}
1012
1013/**
1014 * ad_rx_machine - handle a port's rx State Machine
1015 * @lacpdu: the lacpdu we've received
1016 * @port: the port we're looking at
1017 *
1018 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1019 * CURRENT. If timer expired set the state machine in the proper state.
1020 * In other cases, this function checks if we need to switch to other state.
1021 */
1022static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1023{
1024 rx_states_t last_state;
1025
1026 // keep current State Machine state to compare later if it was changed
1027 last_state = port->sm_rx_state;
1028
1029 // check if state machine should change state
1030 // first, check if port was reinitialized
1031 if (port->sm_vars & AD_PORT_BEGIN)
1032 /* next state */
1033 port->sm_rx_state = AD_RX_INITIALIZE;
1034 // check if port is not enabled
1035 else if (!(port->sm_vars & AD_PORT_BEGIN)
1036 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1037 /* next state */
1038 port->sm_rx_state = AD_RX_PORT_DISABLED;
1039 // check if new lacpdu arrived
1040 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1041 port->sm_rx_timer_counter = 0; // zero timer
1042 port->sm_rx_state = AD_RX_CURRENT;
1043 } else {
1044 // if timer is on, and if it is expired
1045 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1046 switch (port->sm_rx_state) {
1047 case AD_RX_EXPIRED:
1048 port->sm_rx_state = AD_RX_DEFAULTED; // next state
1049 break;
1050 case AD_RX_CURRENT:
1051 port->sm_rx_state = AD_RX_EXPIRED; // next state
1052 break;
1053 default: //to silence the compiler
1054 break;
1055 }
1056 } else {
1057 // if no lacpdu arrived and no timer is on
1058 switch (port->sm_rx_state) {
1059 case AD_RX_PORT_DISABLED:
1060 if (port->sm_vars & AD_PORT_MOVED)
1061 port->sm_rx_state = AD_RX_INITIALIZE; // next state
1062 else if (port->is_enabled
1063 && (port->sm_vars
1064 & AD_PORT_LACP_ENABLED))
1065 port->sm_rx_state = AD_RX_EXPIRED; // next state
1066 else if (port->is_enabled
1067 && ((port->sm_vars
1068 & AD_PORT_LACP_ENABLED) == 0))
1069 port->sm_rx_state = AD_RX_LACP_DISABLED; // next state
1070 break;
1071 default: //to silence the compiler
1072 break;
1073
1074 }
1075 }
1076 }
1077
1078 // check if the State machine was changed or new lacpdu arrived
1079 if ((port->sm_rx_state != last_state) || (lacpdu)) {
1080 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1081 port->actor_port_number, last_state,
1082 port->sm_rx_state);
1083 switch (port->sm_rx_state) {
1084 case AD_RX_INITIALIZE:
1085 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1086 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1087 else
1088 port->sm_vars |= AD_PORT_LACP_ENABLED;
1089 port->sm_vars &= ~AD_PORT_SELECTED;
1090 __record_default(port);
1091 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1092 port->sm_vars &= ~AD_PORT_MOVED;
1093 port->sm_rx_state = AD_RX_PORT_DISABLED; // next state
1094
1095 /*- Fall Through -*/
1096
1097 case AD_RX_PORT_DISABLED:
1098 port->sm_vars &= ~AD_PORT_MATCHED;
1099 break;
1100 case AD_RX_LACP_DISABLED:
1101 port->sm_vars &= ~AD_PORT_SELECTED;
1102 __record_default(port);
1103 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1104 port->sm_vars |= AD_PORT_MATCHED;
1105 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1106 break;
1107 case AD_RX_EXPIRED:
1108 //Reset of the Synchronization flag. (Standard 43.4.12)
1109 //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1110 //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1111 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1112 port->sm_vars &= ~AD_PORT_MATCHED;
1113 port->partner_oper.port_state |=
1114 AD_STATE_LACP_ACTIVITY;
1115 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1116 port->actor_oper_port_state |= AD_STATE_EXPIRED;
1117 break;
1118 case AD_RX_DEFAULTED:
1119 __update_default_selected(port);
1120 __record_default(port);
1121 port->sm_vars |= AD_PORT_MATCHED;
1122 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1123 break;
1124 case AD_RX_CURRENT:
1125 // detect loopback situation
1126 if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1127 // INFO_RECEIVED_LOOPBACK_FRAMES
1128 pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
1129 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1130 port->slave->dev->master->name, port->slave->dev->name);
1131 return;
1132 }
1133 __update_selected(lacpdu, port);
1134 __update_ntt(lacpdu, port);
1135 __record_pdu(lacpdu, port);
1136 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1137 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1138 break;
1139 default: //to silence the compiler
1140 break;
1141 }
1142 }
1143}
1144
1145/**
1146 * ad_tx_machine - handle a port's tx state machine
1147 * @port: the port we're looking at
1148 *
1149 */
1150static void ad_tx_machine(struct port *port)
1151{
1152 // check if tx timer expired, to verify that we do not send more than 3 packets per second
1153 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1154 // check if there is something to send
1155 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1156 __update_lacpdu_from_port(port);
1157
1158 if (ad_lacpdu_send(port) >= 0) {
1159 pr_debug("Sent LACPDU on port %d\n",
1160 port->actor_port_number);
1161
1162 /* mark ntt as false, so it will not be sent again until
1163 demanded */
1164 port->ntt = false;
1165 }
1166 }
1167 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1168 port->sm_tx_timer_counter =
1169 ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1170 }
1171}
1172
1173/**
1174 * ad_periodic_machine - handle a port's periodic state machine
1175 * @port: the port we're looking at
1176 *
1177 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1178 */
1179static void ad_periodic_machine(struct port *port)
1180{
1181 periodic_states_t last_state;
1182
1183 // keep current state machine state to compare later if it was changed
1184 last_state = port->sm_periodic_state;
1185
1186 // check if port was reinitialized
1187 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1188 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1189 ) {
1190 port->sm_periodic_state = AD_NO_PERIODIC; // next state
1191 }
1192 // check if state machine should change state
1193 else if (port->sm_periodic_timer_counter) {
1194 // check if periodic state machine expired
1195 if (!(--port->sm_periodic_timer_counter)) {
1196 // if expired then do tx
1197 port->sm_periodic_state = AD_PERIODIC_TX; // next state
1198 } else {
1199 // If not expired, check if there is some new timeout parameter from the partner state
1200 switch (port->sm_periodic_state) {
1201 case AD_FAST_PERIODIC:
1202 if (!(port->partner_oper.port_state
1203 & AD_STATE_LACP_TIMEOUT))
1204 port->sm_periodic_state = AD_SLOW_PERIODIC; // next state
1205 break;
1206 case AD_SLOW_PERIODIC:
1207 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1208 // stop current timer
1209 port->sm_periodic_timer_counter = 0;
1210 port->sm_periodic_state = AD_PERIODIC_TX; // next state
1211 }
1212 break;
1213 default: //to silence the compiler
1214 break;
1215 }
1216 }
1217 } else {
1218 switch (port->sm_periodic_state) {
1219 case AD_NO_PERIODIC:
1220 port->sm_periodic_state = AD_FAST_PERIODIC; // next state
1221 break;
1222 case AD_PERIODIC_TX:
1223 if (!(port->partner_oper.port_state
1224 & AD_STATE_LACP_TIMEOUT))
1225 port->sm_periodic_state = AD_SLOW_PERIODIC; // next state
1226 else
1227 port->sm_periodic_state = AD_FAST_PERIODIC; // next state
1228 break;
1229 default: //to silence the compiler
1230 break;
1231 }
1232 }
1233
1234 // check if the state machine was changed
1235 if (port->sm_periodic_state != last_state) {
1236 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1237 port->actor_port_number, last_state,
1238 port->sm_periodic_state);
1239 switch (port->sm_periodic_state) {
1240 case AD_NO_PERIODIC:
1241 port->sm_periodic_timer_counter = 0; // zero timer
1242 break;
1243 case AD_FAST_PERIODIC:
1244 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1245 break;
1246 case AD_SLOW_PERIODIC:
1247 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1248 break;
1249 case AD_PERIODIC_TX:
1250 port->ntt = true;
1251 break;
1252 default: //to silence the compiler
1253 break;
1254 }
1255 }
1256}
1257
1258/**
1259 * ad_port_selection_logic - select aggregation groups
1260 * @port: the port we're looking at
1261 *
1262 * Select aggregation groups, and assign each port for it's aggregetor. The
1263 * selection logic is called in the inititalization (after all the handshkes),
1264 * and after every lacpdu receive (if selected is off).
1265 */
1266static void ad_port_selection_logic(struct port *port)
1267{
1268 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1269 struct port *last_port = NULL, *curr_port;
1270 int found = 0;
1271
1272 // if the port is already Selected, do nothing
1273 if (port->sm_vars & AD_PORT_SELECTED)
1274 return;
1275
1276 // if the port is connected to other aggregator, detach it
1277 if (port->aggregator) {
1278 // detach the port from its former aggregator
1279 temp_aggregator = port->aggregator;
1280 for (curr_port = temp_aggregator->lag_ports; curr_port;
1281 last_port = curr_port,
1282 curr_port = curr_port->next_port_in_aggregator) {
1283 if (curr_port == port) {
1284 temp_aggregator->num_of_ports--;
1285 if (!last_port) {// if it is the first port attached to the aggregator
1286 temp_aggregator->lag_ports =
1287 port->next_port_in_aggregator;
1288 } else {// not the first port attached to the aggregator
1289 last_port->next_port_in_aggregator =
1290 port->next_port_in_aggregator;
1291 }
1292
1293 // clear the port's relations to this aggregator
1294 port->aggregator = NULL;
1295 port->next_port_in_aggregator = NULL;
1296 port->actor_port_aggregator_identifier = 0;
1297
1298 pr_debug("Port %d left LAG %d\n",
1299 port->actor_port_number,
1300 temp_aggregator->aggregator_identifier);
1301 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1302 if (!temp_aggregator->lag_ports)
1303 ad_clear_agg(temp_aggregator);
1304 break;
1305 }
1306 }
1307 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1308 pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1309 port->slave->dev->master->name,
1310 port->actor_port_number,
1311 port->slave->dev->name,
1312 port->aggregator->aggregator_identifier);
1313 }
1314 }
1315 // search on all aggregators for a suitable aggregator for this port
1316 for (aggregator = __get_first_agg(port); aggregator;
1317 aggregator = __get_next_agg(aggregator)) {
1318
1319 // keep a free aggregator for later use(if needed)
1320 if (!aggregator->lag_ports) {
1321 if (!free_aggregator)
1322 free_aggregator = aggregator;
1323 continue;
1324 }
1325 // check if current aggregator suits us
1326 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1327 !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1328 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1329 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1330 ) &&
1331 ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1332 !aggregator->is_individual) // but is not individual OR
1333 )
1334 ) {
1335 // attach to the founded aggregator
1336 port->aggregator = aggregator;
1337 port->actor_port_aggregator_identifier =
1338 port->aggregator->aggregator_identifier;
1339 port->next_port_in_aggregator = aggregator->lag_ports;
1340 port->aggregator->num_of_ports++;
1341 aggregator->lag_ports = port;
1342 pr_debug("Port %d joined LAG %d(existing LAG)\n",
1343 port->actor_port_number,
1344 port->aggregator->aggregator_identifier);
1345
1346 // mark this port as selected
1347 port->sm_vars |= AD_PORT_SELECTED;
1348 found = 1;
1349 break;
1350 }
1351 }
1352
1353 // the port couldn't find an aggregator - attach it to a new aggregator
1354 if (!found) {
1355 if (free_aggregator) {
1356 // assign port a new aggregator
1357 port->aggregator = free_aggregator;
1358 port->actor_port_aggregator_identifier =
1359 port->aggregator->aggregator_identifier;
1360
1361 // update the new aggregator's parameters
1362 // if port was responsed from the end-user
1363 if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1364 /* if port is full duplex */
1365 port->aggregator->is_individual = false;
1366 else
1367 port->aggregator->is_individual = true;
1368
1369 port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1370 port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1371 port->aggregator->partner_system =
1372 port->partner_oper.system;
1373 port->aggregator->partner_system_priority =
1374 port->partner_oper.system_priority;
1375 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1376 port->aggregator->receive_state = 1;
1377 port->aggregator->transmit_state = 1;
1378 port->aggregator->lag_ports = port;
1379 port->aggregator->num_of_ports++;
1380
1381 // mark this port as selected
1382 port->sm_vars |= AD_PORT_SELECTED;
1383
1384 pr_debug("Port %d joined LAG %d(new LAG)\n",
1385 port->actor_port_number,
1386 port->aggregator->aggregator_identifier);
1387 } else {
1388 pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1389 port->slave->dev->master->name,
1390 port->actor_port_number, port->slave->dev->name);
1391 }
1392 }
1393 // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1394 // else set ready=FALSE in all aggregator's ports
1395 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1396
1397 aggregator = __get_first_agg(port);
1398 ad_agg_selection_logic(aggregator);
1399}
1400
1401/*
1402 * Decide if "agg" is a better choice for the new active aggregator that
1403 * the current best, according to the ad_select policy.
1404 */
1405static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1406 struct aggregator *curr)
1407{
1408 /*
1409 * 0. If no best, select current.
1410 *
1411 * 1. If the current agg is not individual, and the best is
1412 * individual, select current.
1413 *
1414 * 2. If current agg is individual and the best is not, keep best.
1415 *
1416 * 3. Therefore, current and best are both individual or both not
1417 * individual, so:
1418 *
1419 * 3a. If current agg partner replied, and best agg partner did not,
1420 * select current.
1421 *
1422 * 3b. If current agg partner did not reply and best agg partner
1423 * did reply, keep best.
1424 *
1425 * 4. Therefore, current and best both have partner replies or
1426 * both do not, so perform selection policy:
1427 *
1428 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1429 * select by bandwidth.
1430 *
1431 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1432 */
1433 if (!best)
1434 return curr;
1435
1436 if (!curr->is_individual && best->is_individual)
1437 return curr;
1438
1439 if (curr->is_individual && !best->is_individual)
1440 return best;
1441
1442 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1443 return curr;
1444
1445 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1446 return best;
1447
1448 switch (__get_agg_selection_mode(curr->lag_ports)) {
1449 case BOND_AD_COUNT:
1450 if (curr->num_of_ports > best->num_of_ports)
1451 return curr;
1452
1453 if (curr->num_of_ports < best->num_of_ports)
1454 return best;
1455
1456 /*FALLTHROUGH*/
1457 case BOND_AD_STABLE:
1458 case BOND_AD_BANDWIDTH:
1459 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1460 return curr;
1461
1462 break;
1463
1464 default:
1465 pr_warning("%s: Impossible agg select mode %d\n",
1466 curr->slave->dev->master->name,
1467 __get_agg_selection_mode(curr->lag_ports));
1468 break;
1469 }
1470
1471 return best;
1472}
1473
1474static int agg_device_up(const struct aggregator *agg)
1475{
1476 struct port *port = agg->lag_ports;
1477 if (!port)
1478 return 0;
1479 return (netif_running(port->slave->dev) &&
1480 netif_carrier_ok(port->slave->dev));
1481}
1482
1483/**
1484 * ad_agg_selection_logic - select an aggregation group for a team
1485 * @aggregator: the aggregator we're looking at
1486 *
1487 * It is assumed that only one aggregator may be selected for a team.
1488 *
1489 * The logic of this function is to select the aggregator according to
1490 * the ad_select policy:
1491 *
1492 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1493 * it, and to reselect the active aggregator only if the previous
1494 * aggregator has no more ports related to it.
1495 *
1496 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1497 * bandwidth, and reselect whenever a link state change takes place or the
1498 * set of slaves in the bond changes.
1499 *
1500 * BOND_AD_COUNT: select the aggregator with largest number of ports
1501 * (slaves), and reselect whenever a link state change takes place or the
1502 * set of slaves in the bond changes.
1503 *
1504 * FIXME: this function MUST be called with the first agg in the bond, or
1505 * __get_active_agg() won't work correctly. This function should be better
1506 * called with the bond itself, and retrieve the first agg from it.
1507 */
1508static void ad_agg_selection_logic(struct aggregator *agg)
1509{
1510 struct aggregator *best, *active, *origin;
1511 struct port *port;
1512
1513 origin = agg;
1514 active = __get_active_agg(agg);
1515 best = (active && agg_device_up(active)) ? active : NULL;
1516
1517 do {
1518 agg->is_active = 0;
1519
1520 if (agg->num_of_ports && agg_device_up(agg))
1521 best = ad_agg_selection_test(best, agg);
1522
1523 } while ((agg = __get_next_agg(agg)));
1524
1525 if (best &&
1526 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1527 /*
1528 * For the STABLE policy, don't replace the old active
1529 * aggregator if it's still active (it has an answering
1530 * partner) or if both the best and active don't have an
1531 * answering partner.
1532 */
1533 if (active && active->lag_ports &&
1534 active->lag_ports->is_enabled &&
1535 (__agg_has_partner(active) ||
1536 (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1537 if (!(!active->actor_oper_aggregator_key &&
1538 best->actor_oper_aggregator_key)) {
1539 best = NULL;
1540 active->is_active = 1;
1541 }
1542 }
1543 }
1544
1545 if (best && (best == active)) {
1546 best = NULL;
1547 active->is_active = 1;
1548 }
1549
1550 // if there is new best aggregator, activate it
1551 if (best) {
1552 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1553 best->aggregator_identifier, best->num_of_ports,
1554 best->actor_oper_aggregator_key,
1555 best->partner_oper_aggregator_key,
1556 best->is_individual, best->is_active);
1557 pr_debug("best ports %p slave %p %s\n",
1558 best->lag_ports, best->slave,
1559 best->slave ? best->slave->dev->name : "NULL");
1560
1561 for (agg = __get_first_agg(best->lag_ports); agg;
1562 agg = __get_next_agg(agg)) {
1563
1564 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1565 agg->aggregator_identifier, agg->num_of_ports,
1566 agg->actor_oper_aggregator_key,
1567 agg->partner_oper_aggregator_key,
1568 agg->is_individual, agg->is_active);
1569 }
1570
1571 // check if any partner replys
1572 if (best->is_individual) {
1573 pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1574 best->slave ? best->slave->dev->master->name : "NULL");
1575 }
1576
1577 best->is_active = 1;
1578 pr_debug("LAG %d chosen as the active LAG\n",
1579 best->aggregator_identifier);
1580 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1581 best->aggregator_identifier, best->num_of_ports,
1582 best->actor_oper_aggregator_key,
1583 best->partner_oper_aggregator_key,
1584 best->is_individual, best->is_active);
1585
1586 // disable the ports that were related to the former active_aggregator
1587 if (active) {
1588 for (port = active->lag_ports; port;
1589 port = port->next_port_in_aggregator) {
1590 __disable_port(port);
1591 }
1592 }
1593 }
1594
1595 /*
1596 * if the selected aggregator is of join individuals
1597 * (partner_system is NULL), enable their ports
1598 */
1599 active = __get_active_agg(origin);
1600
1601 if (active) {
1602 if (!__agg_has_partner(active)) {
1603 for (port = active->lag_ports; port;
1604 port = port->next_port_in_aggregator) {
1605 __enable_port(port);
1606 }
1607 }
1608 }
1609
1610 if (origin->slave) {
1611 struct bonding *bond;
1612
1613 bond = bond_get_bond_by_slave(origin->slave);
1614 if (bond)
1615 bond_3ad_set_carrier(bond);
1616 }
1617}
1618
1619/**
1620 * ad_clear_agg - clear a given aggregator's parameters
1621 * @aggregator: the aggregator we're looking at
1622 *
1623 */
1624static void ad_clear_agg(struct aggregator *aggregator)
1625{
1626 if (aggregator) {
1627 aggregator->is_individual = false;
1628 aggregator->actor_admin_aggregator_key = 0;
1629 aggregator->actor_oper_aggregator_key = 0;
1630 aggregator->partner_system = null_mac_addr;
1631 aggregator->partner_system_priority = 0;
1632 aggregator->partner_oper_aggregator_key = 0;
1633 aggregator->receive_state = 0;
1634 aggregator->transmit_state = 0;
1635 aggregator->lag_ports = NULL;
1636 aggregator->is_active = 0;
1637 aggregator->num_of_ports = 0;
1638 pr_debug("LAG %d was cleared\n",
1639 aggregator->aggregator_identifier);
1640 }
1641}
1642
1643/**
1644 * ad_initialize_agg - initialize a given aggregator's parameters
1645 * @aggregator: the aggregator we're looking at
1646 *
1647 */
1648static void ad_initialize_agg(struct aggregator *aggregator)
1649{
1650 if (aggregator) {
1651 ad_clear_agg(aggregator);
1652
1653 aggregator->aggregator_mac_address = null_mac_addr;
1654 aggregator->aggregator_identifier = 0;
1655 aggregator->slave = NULL;
1656 }
1657}
1658
1659/**
1660 * ad_initialize_port - initialize a given port's parameters
1661 * @aggregator: the aggregator we're looking at
1662 * @lacp_fast: boolean. whether fast periodic should be used
1663 *
1664 */
1665static void ad_initialize_port(struct port *port, int lacp_fast)
1666{
1667 static const struct port_params tmpl = {
1668 .system_priority = 0xffff,
1669 .key = 1,
1670 .port_number = 1,
1671 .port_priority = 0xff,
1672 .port_state = 1,
1673 };
1674 static const struct lacpdu lacpdu = {
1675 .subtype = 0x01,
1676 .version_number = 0x01,
1677 .tlv_type_actor_info = 0x01,
1678 .actor_information_length = 0x14,
1679 .tlv_type_partner_info = 0x02,
1680 .partner_information_length = 0x14,
1681 .tlv_type_collector_info = 0x03,
1682 .collector_information_length = 0x10,
1683 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1684 };
1685
1686 if (port) {
1687 port->actor_port_number = 1;
1688 port->actor_port_priority = 0xff;
1689 port->actor_system = null_mac_addr;
1690 port->actor_system_priority = 0xffff;
1691 port->actor_port_aggregator_identifier = 0;
1692 port->ntt = false;
1693 port->actor_admin_port_key = 1;
1694 port->actor_oper_port_key = 1;
1695 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1696 port->actor_oper_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1697
1698 if (lacp_fast)
1699 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1700
1701 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1702 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1703
1704 port->is_enabled = true;
1705 // ****** private parameters ******
1706 port->sm_vars = 0x3;
1707 port->sm_rx_state = 0;
1708 port->sm_rx_timer_counter = 0;
1709 port->sm_periodic_state = 0;
1710 port->sm_periodic_timer_counter = 0;
1711 port->sm_mux_state = 0;
1712 port->sm_mux_timer_counter = 0;
1713 port->sm_tx_state = 0;
1714 port->sm_tx_timer_counter = 0;
1715 port->slave = NULL;
1716 port->aggregator = NULL;
1717 port->next_port_in_aggregator = NULL;
1718 port->transaction_id = 0;
1719
1720 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1721 }
1722}
1723
1724/**
1725 * ad_enable_collecting_distributing - enable a port's transmit/receive
1726 * @port: the port we're looking at
1727 *
1728 * Enable @port if it's in an active aggregator
1729 */
1730static void ad_enable_collecting_distributing(struct port *port)
1731{
1732 if (port->aggregator->is_active) {
1733 pr_debug("Enabling port %d(LAG %d)\n",
1734 port->actor_port_number,
1735 port->aggregator->aggregator_identifier);
1736 __enable_port(port);
1737 }
1738}
1739
1740/**
1741 * ad_disable_collecting_distributing - disable a port's transmit/receive
1742 * @port: the port we're looking at
1743 *
1744 */
1745static void ad_disable_collecting_distributing(struct port *port)
1746{
1747 if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1748 pr_debug("Disabling port %d(LAG %d)\n",
1749 port->actor_port_number,
1750 port->aggregator->aggregator_identifier);
1751 __disable_port(port);
1752 }
1753}
1754
1755#if 0
1756/**
1757 * ad_marker_info_send - send a marker information frame
1758 * @port: the port we're looking at
1759 *
1760 * This function does nothing since we decided not to implement send and handle
1761 * response for marker PDU's, in this stage, but only to respond to marker
1762 * information.
1763 */
1764static void ad_marker_info_send(struct port *port)
1765{
1766 struct bond_marker marker;
1767 u16 index;
1768
1769 // fill the marker PDU with the appropriate values
1770 marker.subtype = 0x02;
1771 marker.version_number = 0x01;
1772 marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1773 marker.marker_length = 0x16;
1774 // convert requester_port to Big Endian
1775 marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1776 marker.requester_system = port->actor_system;
1777 // convert requester_port(u32) to Big Endian
1778 marker.requester_transaction_id =
1779 (((++port->transaction_id & 0xFF) << 24)
1780 | ((port->transaction_id & 0xFF00) << 8)
1781 | ((port->transaction_id & 0xFF0000) >> 8)
1782 | ((port->transaction_id & 0xFF000000) >> 24));
1783 marker.pad = 0;
1784 marker.tlv_type_terminator = 0x00;
1785 marker.terminator_length = 0x00;
1786 for (index = 0; index < 90; index++)
1787 marker.reserved_90[index] = 0;
1788
1789 // send the marker information
1790 if (ad_marker_send(port, &marker) >= 0) {
1791 pr_debug("Sent Marker Information on port %d\n",
1792 port->actor_port_number);
1793 }
1794}
1795#endif
1796
1797/**
1798 * ad_marker_info_received - handle receive of a Marker information frame
1799 * @marker_info: Marker info received
1800 * @port: the port we're looking at
1801 *
1802 */
1803static void ad_marker_info_received(struct bond_marker *marker_info,
1804 struct port *port)
1805{
1806 struct bond_marker marker;
1807
1808 // copy the received marker data to the response marker
1809 //marker = *marker_info;
1810 memcpy(&marker, marker_info, sizeof(struct bond_marker));
1811 // change the marker subtype to marker response
1812 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1813 // send the marker response
1814
1815 if (ad_marker_send(port, &marker) >= 0) {
1816 pr_debug("Sent Marker Response on port %d\n",
1817 port->actor_port_number);
1818 }
1819}
1820
1821/**
1822 * ad_marker_response_received - handle receive of a marker response frame
1823 * @marker: marker PDU received
1824 * @port: the port we're looking at
1825 *
1826 * This function does nothing since we decided not to implement send and handle
1827 * response for marker PDU's, in this stage, but only to respond to marker
1828 * information.
1829 */
1830static void ad_marker_response_received(struct bond_marker *marker,
1831 struct port *port)
1832{
1833 marker = NULL; /* just to satisfy the compiler */
1834 port = NULL; /* just to satisfy the compiler */
1835 // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1836}
1837
1838//////////////////////////////////////////////////////////////////////////////////////
1839// ================= AD exported functions to the main bonding code ==================
1840//////////////////////////////////////////////////////////////////////////////////////
1841
1842// Check aggregators status in team every T seconds
1843#define AD_AGGREGATOR_SELECTION_TIMER 8
1844
1845/*
1846 * bond_3ad_initiate_agg_selection(struct bonding *bond)
1847 *
1848 * Set the aggregation selection timer, to initiate an agg selection in
1849 * the very near future. Called during first initialization, and during
1850 * any down to up transitions of the bond.
1851 */
1852void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1853{
1854 BOND_AD_INFO(bond).agg_select_timer = timeout;
1855}
1856
1857static u16 aggregator_identifier;
1858
1859/**
1860 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1861 * @bond: bonding struct to work on
1862 * @tick_resolution: tick duration (millisecond resolution)
1863 *
1864 * Can be called only after the mac address of the bond is set.
1865 */
1866void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1867{
1868 // check that the bond is not initialized yet
1869 if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1870 bond->dev->dev_addr)) {
1871
1872 aggregator_identifier = 0;
1873
1874 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1875 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1876
1877 // initialize how many times this module is called in one second(should be about every 100ms)
1878 ad_ticks_per_sec = tick_resolution;
1879
1880 bond_3ad_initiate_agg_selection(bond,
1881 AD_AGGREGATOR_SELECTION_TIMER *
1882 ad_ticks_per_sec);
1883 }
1884}
1885
1886/**
1887 * bond_3ad_bind_slave - initialize a slave's port
1888 * @slave: slave struct to work on
1889 *
1890 * Returns: 0 on success
1891 * < 0 on error
1892 */
1893int bond_3ad_bind_slave(struct slave *slave)
1894{
1895 struct bonding *bond = bond_get_bond_by_slave(slave);
1896 struct port *port;
1897 struct aggregator *aggregator;
1898
1899 if (bond == NULL) {
1900 pr_err("%s: The slave %s is not attached to its bond\n",
1901 slave->dev->master->name, slave->dev->name);
1902 return -1;
1903 }
1904
1905 //check that the slave has not been initialized yet.
1906 if (SLAVE_AD_INFO(slave).port.slave != slave) {
1907
1908 // port initialization
1909 port = &(SLAVE_AD_INFO(slave).port);
1910
1911 ad_initialize_port(port, bond->params.lacp_fast);
1912
1913 port->slave = slave;
1914 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1915 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1916 // ------------------------------------------------------------
1917 // Port key : | User key | Speed |Duplex|
1918 // ------------------------------------------------------------
1919 // 16 6 1 0
1920 port->actor_admin_port_key = 0; // initialize this parameter
1921 port->actor_admin_port_key |= __get_duplex(port);
1922 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1923 port->actor_oper_port_key = port->actor_admin_port_key;
1924 // if the port is not full duplex, then the port should be not lacp Enabled
1925 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1926 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1927 // actor system is the bond's system
1928 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1929 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1930 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1931 port->aggregator = NULL;
1932 port->next_port_in_aggregator = NULL;
1933
1934 __disable_port(port);
1935 __initialize_port_locks(port);
1936
1937
1938 // aggregator initialization
1939 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1940
1941 ad_initialize_agg(aggregator);
1942
1943 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1944 aggregator->aggregator_identifier = (++aggregator_identifier);
1945 aggregator->slave = slave;
1946 aggregator->is_active = 0;
1947 aggregator->num_of_ports = 0;
1948 }
1949
1950 return 0;
1951}
1952
1953/**
1954 * bond_3ad_unbind_slave - deinitialize a slave's port
1955 * @slave: slave struct to work on
1956 *
1957 * Search for the aggregator that is related to this port, remove the
1958 * aggregator and assign another aggregator for other port related to it
1959 * (if any), and remove the port.
1960 */
1961void bond_3ad_unbind_slave(struct slave *slave)
1962{
1963 struct port *port, *prev_port, *temp_port;
1964 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1965 int select_new_active_agg = 0;
1966
1967 // find the aggregator related to this slave
1968 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1969
1970 // find the port related to this slave
1971 port = &(SLAVE_AD_INFO(slave).port);
1972
1973 // if slave is null, the whole port is not initialized
1974 if (!port->slave) {
1975 pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1976 slave->dev->master->name, slave->dev->name);
1977 return;
1978 }
1979
1980 pr_debug("Unbinding Link Aggregation Group %d\n",
1981 aggregator->aggregator_identifier);
1982
1983 /* Tell the partner that this port is not suitable for aggregation */
1984 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1985 __update_lacpdu_from_port(port);
1986 ad_lacpdu_send(port);
1987
1988 // check if this aggregator is occupied
1989 if (aggregator->lag_ports) {
1990 // check if there are other ports related to this aggregator except
1991 // the port related to this slave(thats ensure us that there is a
1992 // reason to search for new aggregator, and that we will find one
1993 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1994 // find new aggregator for the related port(s)
1995 new_aggregator = __get_first_agg(port);
1996 for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1997 // if the new aggregator is empty, or it is connected to our port only
1998 if (!new_aggregator->lag_ports
1999 || ((new_aggregator->lag_ports == port)
2000 && !new_aggregator->lag_ports->next_port_in_aggregator))
2001 break;
2002 }
2003 // if new aggregator found, copy the aggregator's parameters
2004 // and connect the related lag_ports to the new aggregator
2005 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2006 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
2007 aggregator->aggregator_identifier,
2008 new_aggregator->aggregator_identifier);
2009
2010 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
2011 pr_info("%s: Removing an active aggregator\n",
2012 aggregator->slave->dev->master->name);
2013 // select new active aggregator
2014 select_new_active_agg = 1;
2015 }
2016
2017 new_aggregator->is_individual = aggregator->is_individual;
2018 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2019 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2020 new_aggregator->partner_system = aggregator->partner_system;
2021 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2022 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2023 new_aggregator->receive_state = aggregator->receive_state;
2024 new_aggregator->transmit_state = aggregator->transmit_state;
2025 new_aggregator->lag_ports = aggregator->lag_ports;
2026 new_aggregator->is_active = aggregator->is_active;
2027 new_aggregator->num_of_ports = aggregator->num_of_ports;
2028
2029 // update the information that is written on the ports about the aggregator
2030 for (temp_port = aggregator->lag_ports; temp_port;
2031 temp_port = temp_port->next_port_in_aggregator) {
2032 temp_port->aggregator = new_aggregator;
2033 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2034 }
2035
2036 // clear the aggregator
2037 ad_clear_agg(aggregator);
2038
2039 if (select_new_active_agg)
2040 ad_agg_selection_logic(__get_first_agg(port));
2041 } else {
2042 pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
2043 slave->dev->master->name);
2044 }
2045 } else { // in case that the only port related to this aggregator is the one we want to remove
2046 select_new_active_agg = aggregator->is_active;
2047 // clear the aggregator
2048 ad_clear_agg(aggregator);
2049 if (select_new_active_agg) {
2050 pr_info("%s: Removing an active aggregator\n",
2051 slave->dev->master->name);
2052 // select new active aggregator
2053 ad_agg_selection_logic(__get_first_agg(port));
2054 }
2055 }
2056 }
2057
2058 pr_debug("Unbinding port %d\n", port->actor_port_number);
2059 // find the aggregator that this port is connected to
2060 temp_aggregator = __get_first_agg(port);
2061 for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2062 prev_port = NULL;
2063 // search the port in the aggregator's related ports
2064 for (temp_port = temp_aggregator->lag_ports; temp_port;
2065 prev_port = temp_port,
2066 temp_port = temp_port->next_port_in_aggregator) {
2067 if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2068 if (prev_port)
2069 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2070 else
2071 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2072 temp_aggregator->num_of_ports--;
2073 if (temp_aggregator->num_of_ports == 0) {
2074 select_new_active_agg = temp_aggregator->is_active;
2075 // clear the aggregator
2076 ad_clear_agg(temp_aggregator);
2077 if (select_new_active_agg) {
2078 pr_info("%s: Removing an active aggregator\n",
2079 slave->dev->master->name);
2080 // select new active aggregator
2081 ad_agg_selection_logic(__get_first_agg(port));
2082 }
2083 }
2084 break;
2085 }
2086 }
2087 }
2088 port->slave = NULL;
2089}
2090
2091/**
2092 * bond_3ad_state_machine_handler - handle state machines timeout
2093 * @bond: bonding struct to work on
2094 *
2095 * The state machine handling concept in this module is to check every tick
2096 * which state machine should operate any function. The execution order is
2097 * round robin, so when we have an interaction between state machines, the
2098 * reply of one to each other might be delayed until next tick.
2099 *
2100 * This function also complete the initialization when the agg_select_timer
2101 * times out, and it selects an aggregator for the ports that are yet not
2102 * related to any aggregator, and selects the active aggregator for a bond.
2103 */
2104void bond_3ad_state_machine_handler(struct work_struct *work)
2105{
2106 struct bonding *bond = container_of(work, struct bonding,
2107 ad_work.work);
2108 struct port *port;
2109 struct aggregator *aggregator;
2110
2111 read_lock(&bond->lock);
2112
2113 //check if there are any slaves
2114 if (bond->slave_cnt == 0)
2115 goto re_arm;
2116
2117 // check if agg_select_timer timer after initialize is timed out
2118 if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2119 // select the active aggregator for the bond
2120 if ((port = __get_first_port(bond))) {
2121 if (!port->slave) {
2122 pr_warning("%s: Warning: bond's first port is uninitialized\n",
2123 bond->dev->name);
2124 goto re_arm;
2125 }
2126
2127 aggregator = __get_first_agg(port);
2128 ad_agg_selection_logic(aggregator);
2129 }
2130 bond_3ad_set_carrier(bond);
2131 }
2132
2133 // for each port run the state machines
2134 for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2135 if (!port->slave) {
2136 pr_warning("%s: Warning: Found an uninitialized port\n",
2137 bond->dev->name);
2138 goto re_arm;
2139 }
2140
2141 /* Lock around state machines to protect data accessed
2142 * by all (e.g., port->sm_vars). ad_rx_machine may run
2143 * concurrently due to incoming LACPDU.
2144 */
2145 __get_state_machine_lock(port);
2146
2147 ad_rx_machine(NULL, port);
2148 ad_periodic_machine(port);
2149 ad_port_selection_logic(port);
2150 ad_mux_machine(port);
2151 ad_tx_machine(port);
2152
2153 // turn off the BEGIN bit, since we already handled it
2154 if (port->sm_vars & AD_PORT_BEGIN)
2155 port->sm_vars &= ~AD_PORT_BEGIN;
2156
2157 __release_state_machine_lock(port);
2158 }
2159
2160re_arm:
2161 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2162
2163 read_unlock(&bond->lock);
2164}
2165
2166/**
2167 * bond_3ad_rx_indication - handle a received frame
2168 * @lacpdu: received lacpdu
2169 * @slave: slave struct to work on
2170 * @length: length of the data received
2171 *
2172 * It is assumed that frames that were sent on this NIC don't returned as new
2173 * received frames (loopback). Since only the payload is given to this
2174 * function, it check for loopback.
2175 */
2176static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2177{
2178 struct port *port;
2179 int ret = RX_HANDLER_ANOTHER;
2180
2181 if (length >= sizeof(struct lacpdu)) {
2182
2183 port = &(SLAVE_AD_INFO(slave).port);
2184
2185 if (!port->slave) {
2186 pr_warning("%s: Warning: port of slave %s is uninitialized\n",
2187 slave->dev->name, slave->dev->master->name);
2188 return ret;
2189 }
2190
2191 switch (lacpdu->subtype) {
2192 case AD_TYPE_LACPDU:
2193 ret = RX_HANDLER_CONSUMED;
2194 pr_debug("Received LACPDU on port %d\n",
2195 port->actor_port_number);
2196 /* Protect against concurrent state machines */
2197 __get_state_machine_lock(port);
2198 ad_rx_machine(lacpdu, port);
2199 __release_state_machine_lock(port);
2200 break;
2201
2202 case AD_TYPE_MARKER:
2203 ret = RX_HANDLER_CONSUMED;
2204 // No need to convert fields to Little Endian since we don't use the marker's fields.
2205
2206 switch (((struct bond_marker *)lacpdu)->tlv_type) {
2207 case AD_MARKER_INFORMATION_SUBTYPE:
2208 pr_debug("Received Marker Information on port %d\n",
2209 port->actor_port_number);
2210 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2211 break;
2212
2213 case AD_MARKER_RESPONSE_SUBTYPE:
2214 pr_debug("Received Marker Response on port %d\n",
2215 port->actor_port_number);
2216 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2217 break;
2218
2219 default:
2220 pr_debug("Received an unknown Marker subtype on slot %d\n",
2221 port->actor_port_number);
2222 }
2223 }
2224 }
2225 return ret;
2226}
2227
2228/**
2229 * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2230 * @slave: slave struct to work on
2231 *
2232 * Handle reselection of aggregator (if needed) for this port.
2233 */
2234void bond_3ad_adapter_speed_changed(struct slave *slave)
2235{
2236 struct port *port;
2237
2238 port = &(SLAVE_AD_INFO(slave).port);
2239
2240 // if slave is null, the whole port is not initialized
2241 if (!port->slave) {
2242 pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
2243 slave->dev->master->name, slave->dev->name);
2244 return;
2245 }
2246
2247 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2248 port->actor_oper_port_key = port->actor_admin_port_key |=
2249 (__get_link_speed(port) << 1);
2250 pr_debug("Port %d changed speed\n", port->actor_port_number);
2251 // there is no need to reselect a new aggregator, just signal the
2252 // state machines to reinitialize
2253 port->sm_vars |= AD_PORT_BEGIN;
2254}
2255
2256/**
2257 * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2258 * @slave: slave struct to work on
2259 *
2260 * Handle reselection of aggregator (if needed) for this port.
2261 */
2262void bond_3ad_adapter_duplex_changed(struct slave *slave)
2263{
2264 struct port *port;
2265
2266 port = &(SLAVE_AD_INFO(slave).port);
2267
2268 // if slave is null, the whole port is not initialized
2269 if (!port->slave) {
2270 pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
2271 slave->dev->master->name, slave->dev->name);
2272 return;
2273 }
2274
2275 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2276 port->actor_oper_port_key = port->actor_admin_port_key |=
2277 __get_duplex(port);
2278 pr_debug("Port %d changed duplex\n", port->actor_port_number);
2279 // there is no need to reselect a new aggregator, just signal the
2280 // state machines to reinitialize
2281 port->sm_vars |= AD_PORT_BEGIN;
2282}
2283
2284/**
2285 * bond_3ad_handle_link_change - handle a slave's link status change indication
2286 * @slave: slave struct to work on
2287 * @status: whether the link is now up or down
2288 *
2289 * Handle reselection of aggregator (if needed) for this port.
2290 */
2291void bond_3ad_handle_link_change(struct slave *slave, char link)
2292{
2293 struct port *port;
2294
2295 port = &(SLAVE_AD_INFO(slave).port);
2296
2297 // if slave is null, the whole port is not initialized
2298 if (!port->slave) {
2299 pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
2300 slave->dev->master->name, slave->dev->name);
2301 return;
2302 }
2303
2304 // on link down we are zeroing duplex and speed since some of the adaptors(ce1000.lan) report full duplex/speed instead of N/A(duplex) / 0(speed)
2305 // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2306 if (link == BOND_LINK_UP) {
2307 port->is_enabled = true;
2308 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2309 port->actor_oper_port_key = port->actor_admin_port_key |=
2310 __get_duplex(port);
2311 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2312 port->actor_oper_port_key = port->actor_admin_port_key |=
2313 (__get_link_speed(port) << 1);
2314 } else {
2315 /* link has failed */
2316 port->is_enabled = false;
2317 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2318 port->actor_oper_port_key = (port->actor_admin_port_key &=
2319 ~AD_SPEED_KEY_BITS);
2320 }
2321 //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2322 // there is no need to reselect a new aggregator, just signal the
2323 // state machines to reinitialize
2324 port->sm_vars |= AD_PORT_BEGIN;
2325}
2326
2327/*
2328 * set link state for bonding master: if we have an active
2329 * aggregator, we're up, if not, we're down. Presumes that we cannot
2330 * have an active aggregator if there are no slaves with link up.
2331 *
2332 * This behavior complies with IEEE 802.3 section 43.3.9.
2333 *
2334 * Called by bond_set_carrier(). Return zero if carrier state does not
2335 * change, nonzero if it does.
2336 */
2337int bond_3ad_set_carrier(struct bonding *bond)
2338{
2339 struct aggregator *active;
2340
2341 active = __get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator));
2342 if (active) {
2343 /* are enough slaves available to consider link up? */
2344 if (active->num_of_ports < bond->params.min_links) {
2345 if (netif_carrier_ok(bond->dev)) {
2346 netif_carrier_off(bond->dev);
2347 return 1;
2348 }
2349 } else if (!netif_carrier_ok(bond->dev)) {
2350 netif_carrier_on(bond->dev);
2351 return 1;
2352 }
2353 return 0;
2354 }
2355
2356 if (netif_carrier_ok(bond->dev)) {
2357 netif_carrier_off(bond->dev);
2358 return 1;
2359 }
2360 return 0;
2361}
2362
2363/**
2364 * bond_3ad_get_active_agg_info - get information of the active aggregator
2365 * @bond: bonding struct to work on
2366 * @ad_info: ad_info struct to fill with the bond's info
2367 *
2368 * Returns: 0 on success
2369 * < 0 on error
2370 */
2371int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2372{
2373 struct aggregator *aggregator = NULL;
2374 struct port *port;
2375
2376 for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2377 if (port->aggregator && port->aggregator->is_active) {
2378 aggregator = port->aggregator;
2379 break;
2380 }
2381 }
2382
2383 if (aggregator) {
2384 ad_info->aggregator_id = aggregator->aggregator_identifier;
2385 ad_info->ports = aggregator->num_of_ports;
2386 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2387 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2388 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2389 return 0;
2390 }
2391
2392 return -1;
2393}
2394
2395int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2396{
2397 struct slave *slave, *start_at;
2398 struct bonding *bond = netdev_priv(dev);
2399 int slave_agg_no;
2400 int slaves_in_agg;
2401 int agg_id;
2402 int i;
2403 struct ad_info ad_info;
2404 int res = 1;
2405
2406 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2407 pr_debug("%s: Error: bond_3ad_get_active_agg_info failed\n",
2408 dev->name);
2409 goto out;
2410 }
2411
2412 slaves_in_agg = ad_info.ports;
2413 agg_id = ad_info.aggregator_id;
2414
2415 if (slaves_in_agg == 0) {
2416 /*the aggregator is empty*/
2417 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2418 goto out;
2419 }
2420
2421 slave_agg_no = bond->xmit_hash_policy(skb, slaves_in_agg);
2422
2423 bond_for_each_slave(bond, slave, i) {
2424 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2425
2426 if (agg && (agg->aggregator_identifier == agg_id)) {
2427 slave_agg_no--;
2428 if (slave_agg_no < 0)
2429 break;
2430 }
2431 }
2432
2433 if (slave_agg_no >= 0) {
2434 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2435 dev->name, agg_id);
2436 goto out;
2437 }
2438
2439 start_at = slave;
2440
2441 bond_for_each_slave_from(bond, slave, i, start_at) {
2442 int slave_agg_id = 0;
2443 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2444
2445 if (agg)
2446 slave_agg_id = agg->aggregator_identifier;
2447
2448 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2449 res = bond_dev_queue_xmit(bond, skb, slave->dev);
2450 break;
2451 }
2452 }
2453
2454out:
2455 if (res) {
2456 /* no suitable interface, frame not sent */
2457 dev_kfree_skb(skb);
2458 }
2459
2460 return NETDEV_TX_OK;
2461}
2462
2463int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct bonding *bond,
2464 struct slave *slave)
2465{
2466 int ret = RX_HANDLER_ANOTHER;
2467 if (skb->protocol != PKT_TYPE_LACPDU)
2468 return ret;
2469
2470 if (!pskb_may_pull(skb, sizeof(struct lacpdu)))
2471 return ret;
2472
2473 read_lock(&bond->lock);
2474 ret = bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2475 read_unlock(&bond->lock);
2476 return ret;
2477}
2478
2479/*
2480 * When modify lacp_rate parameter via sysfs,
2481 * update actor_oper_port_state of each port.
2482 *
2483 * Hold slave->state_machine_lock,
2484 * so we can modify port->actor_oper_port_state,
2485 * no matter bond is up or down.
2486 */
2487void bond_3ad_update_lacp_rate(struct bonding *bond)
2488{
2489 int i;
2490 struct slave *slave;
2491 struct port *port = NULL;
2492 int lacp_fast;
2493
2494 read_lock(&bond->lock);
2495 lacp_fast = bond->params.lacp_fast;
2496
2497 bond_for_each_slave(bond, slave, i) {
2498 port = &(SLAVE_AD_INFO(slave).port);
2499 __get_state_machine_lock(port);
2500 if (lacp_fast)
2501 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2502 else
2503 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2504 __release_state_machine_lock(port);
2505 }
2506
2507 read_unlock(&bond->lock);
2508}