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