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