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