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