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