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