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[mirror_ubuntu-zesty-kernel.git] / drivers / net / bonding / bond_3ad.c
CommitLineData
1da177e4
LT		 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 *
1da177e4
LT		 21 */
22
a4aee5c8
JP		 23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
1da177e4
LT		 25#include <linux/skbuff.h>
26#include <linux/if_ether.h>
27#include <linux/netdevice.h>
28#include <linux/spinlock.h>
29#include <linux/ethtool.h>
fd989c83 30#include <linux/etherdevice.h>
1da177e4
LT		 31#include <linux/if_bonding.h>
32#include <linux/pkt_sched.h>
e730c155 33#include <net/net_namespace.h>
1da177e4
LT		 34#include "bonding.h"
35#include "bond_3ad.h"
36
3bf2d28a 37/* General definitions */
1da177e4
LT		 38#define AD_SHORT_TIMEOUT 1
39#define AD_LONG_TIMEOUT 0
40#define AD_STANDBY 0x2
41#define AD_MAX_TX_IN_SECOND 3
42#define AD_COLLECTOR_MAX_DELAY 0
43
3bf2d28a 44/* Timer definitions (43.4.4 in the 802.3ad standard) */
1da177e4
LT		 45#define AD_FAST_PERIODIC_TIME 1
46#define AD_SLOW_PERIODIC_TIME 30
47#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
48#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
49#define AD_CHURN_DETECTION_TIME 60
50#define AD_AGGREGATE_WAIT_TIME 2
51
3bf2d28a 52/* Port state definitions (43.4.2.2 in the 802.3ad standard) */
1da177e4
LT		 53#define AD_STATE_LACP_ACTIVITY 0x1
54#define AD_STATE_LACP_TIMEOUT 0x2
55#define AD_STATE_AGGREGATION 0x4
56#define AD_STATE_SYNCHRONIZATION 0x8
57#define AD_STATE_COLLECTING 0x10
58#define AD_STATE_DISTRIBUTING 0x20
59#define AD_STATE_DEFAULTED 0x40
60#define AD_STATE_EXPIRED 0x80
61
3bf2d28a
VF		 62/* Port Variables definitions used by the State Machines (43.4.7 in the
63 * 802.3ad standard)
64 */
1da177e4
LT		 65#define AD_PORT_BEGIN 0x1
66#define AD_PORT_LACP_ENABLED 0x2
67#define AD_PORT_ACTOR_CHURN 0x4
68#define AD_PORT_PARTNER_CHURN 0x8
69#define AD_PORT_READY 0x10
70#define AD_PORT_READY_N 0x20
71#define AD_PORT_MATCHED 0x40
72#define AD_PORT_STANDBY 0x80
73#define AD_PORT_SELECTED 0x100
74#define AD_PORT_MOVED 0x200
75
3bf2d28a
VF		 76/* Port Key definitions
77 * key is determined according to the link speed, duplex and
78 * user key (which is yet not supported)
79 * --------------------------------------------------------------
80 * Port key : | User key | Speed | Duplex |
81 * --------------------------------------------------------------
82 * 16 6 1 0
83 */
1da177e4
LT		 84#define AD_DUPLEX_KEY_BITS 0x1
85#define AD_SPEED_KEY_BITS 0x3E
86#define AD_USER_KEY_BITS 0xFFC0
87
1da177e4
LT		 88#define AD_LINK_SPEED_BITMASK_1MBPS 0x1
89#define AD_LINK_SPEED_BITMASK_10MBPS 0x2
90#define AD_LINK_SPEED_BITMASK_100MBPS 0x4
91#define AD_LINK_SPEED_BITMASK_1000MBPS 0x8
94dbffd5 92#define AD_LINK_SPEED_BITMASK_10000MBPS 0x10
1da177e4 93
815117ad 94/* compare MAC addresses */
95#define MAC_ADDRESS_EQUAL(A, B) \
96 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
1da177e4 97
128ea6c3 98static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
1da177e4
LT		 99static u16 ad_ticks_per_sec;
100static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
101
e4ac4320
HE		 102static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
103
3bf2d28a 104/* ================= main 802.3ad protocol functions ================== */
1da177e4 105static int ad_lacpdu_send(struct port *port);
1c3f0b8e 106static int ad_marker_send(struct port *port, struct bond_marker *marker);
1da177e4
LT		 107static void ad_mux_machine(struct port *port);
108static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
109static void ad_tx_machine(struct port *port);
110static void ad_periodic_machine(struct port *port);
111static void ad_port_selection_logic(struct port *port);
112static void ad_agg_selection_logic(struct aggregator *aggregator);
113static void ad_clear_agg(struct aggregator *aggregator);
114static void ad_initialize_agg(struct aggregator *aggregator);
115static void ad_initialize_port(struct port *port, int lacp_fast);
1da177e4
LT		 116static void ad_enable_collecting_distributing(struct port *port);
117static void ad_disable_collecting_distributing(struct port *port);
3bf2d28a
VF		 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);
1da177e4
LT		 122
123
3bf2d28a 124/* ================= api to bonding and kernel code ================== */
1da177e4
LT		 125
126/**
127 * __get_bond_by_port - get the port's bonding struct
128 * @port: the port we're looking at
129 *
130 * Return @port's bonding struct, or %NULL if it can't be found.
131 */
132static inline struct bonding *__get_bond_by_port(struct port *port)
133{
7bfc4753 134 if (port->slave == NULL)
1da177e4 135 return NULL;
1da177e4
LT		 136
137 return bond_get_bond_by_slave(port->slave);
138}
139
1da177e4
LT		 140/**
141 * __get_first_agg - get the first aggregator in the bond
142 * @bond: the bond we're looking at
143 *
144 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
145 * found.
768b9549 146 * The caller must hold RCU or RTNL lock.
1da177e4
LT		 147 */
148static inline struct aggregator *__get_first_agg(struct port *port)
149{
150 struct bonding *bond = __get_bond_by_port(port);
dec1e90e 151 struct slave *first_slave;
768b9549 152 struct aggregator *agg;
1da177e4 153
be79bd04 154 /* If there's no bond for this port, or bond has no slaves */
dec1e90e 155 if (bond == NULL)
1da177e4 156 return NULL;
3bf2d28a 157
be79bd04 158 rcu_read_lock();
159 first_slave = bond_first_slave_rcu(bond);
768b9549 160 agg = first_slave ? &(SLAVE_AD_INFO(first_slave).aggregator) : NULL;
be79bd04 161 rcu_read_unlock();
3bf2d28a 162
768b9549 163 return agg;
1da177e4
LT		 164}
165
3bf2d28a
VF		 166/**
167 * __agg_has_partner - see if we have a partner
168 * @agg: the agregator we're looking at
fd989c83
JV		 169 *
170 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
3bf2d28a 171 * address for the partner). Return 0 if not.
fd989c83
JV		 172 */
173static inline int __agg_has_partner(struct aggregator *agg)
174{
175 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
176}
177
1da177e4
LT		 178/**
179 * __disable_port - disable the port's slave
180 * @port: the port we're looking at
1da177e4
LT		 181 */
182static inline void __disable_port(struct port *port)
183{
184 bond_set_slave_inactive_flags(port->slave);
185}
186
187/**
188 * __enable_port - enable the port's slave, if it's up
189 * @port: the port we're looking at
1da177e4
LT		 190 */
191static inline void __enable_port(struct port *port)
192{
193 struct slave *slave = port->slave;
194
7bfc4753 195 if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
1da177e4 196 bond_set_slave_active_flags(slave);
1da177e4
LT		 197}
198
199/**
200 * __port_is_enabled - check if the port's slave is in active state
201 * @port: the port we're looking at
1da177e4
LT		 202 */
203static inline int __port_is_enabled(struct port *port)
204{
e30bc066 205 return bond_is_active_slave(port->slave);
1da177e4
LT		 206}
207
208/**
209 * __get_agg_selection_mode - get the aggregator selection mode
210 * @port: the port we're looking at
211 *
fd989c83 212 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
1da177e4
LT		 213 */
214static inline u32 __get_agg_selection_mode(struct port *port)
215{
216 struct bonding *bond = __get_bond_by_port(port);
217
7bfc4753 218 if (bond == NULL)
fd989c83 219 return BOND_AD_STABLE;
1da177e4 220
1a14fbcb 221 return bond->params.ad_select;
1da177e4
LT		 222}
223
224/**
225 * __check_agg_selection_timer - check if the selection timer has expired
226 * @port: the port we're looking at
1da177e4
LT		 227 */
228static inline int __check_agg_selection_timer(struct port *port)
229{
230 struct bonding *bond = __get_bond_by_port(port);
231
7bfc4753 232 if (bond == NULL)
1da177e4 233 return 0;
1da177e4
LT		 234
235 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
236}
237
238/**
9ac3524a 239 * __get_state_machine_lock - lock the port's state machines
1da177e4 240 * @port: the port we're looking at
1da177e4 241 */
9ac3524a 242static inline void __get_state_machine_lock(struct port *port)
1da177e4 243{
9ac3524a 244 spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
1da177e4
LT		 245}
246
247/**
9ac3524a 248 * __release_state_machine_lock - unlock the port's state machines
1da177e4 249 * @port: the port we're looking at
1da177e4 250 */
9ac3524a 251static inline void __release_state_machine_lock(struct port *port)
1da177e4 252{
9ac3524a 253 spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
1da177e4
LT		 254}
255
256/**
257 * __get_link_speed - get a port's speed
258 * @port: the port we're looking at
259 *
260 * Return @port's speed in 802.3ad bitmask format. i.e. one of:
261 * 0,
262 * %AD_LINK_SPEED_BITMASK_10MBPS,
263 * %AD_LINK_SPEED_BITMASK_100MBPS,
94dbffd5
JV		 264 * %AD_LINK_SPEED_BITMASK_1000MBPS,
265 * %AD_LINK_SPEED_BITMASK_10000MBPS
1da177e4
LT		 266 */
267static u16 __get_link_speed(struct port *port)
268{
269 struct slave *slave = port->slave;
270 u16 speed;
271
3bf2d28a
VF		 272 /* this if covers only a special case: when the configuration starts
273 * with link down, it sets the speed to 0.
274 * This is done in spite of the fact that the e100 driver reports 0
275 * to be compatible with MVT in the future.
276 */
7bfc4753 277 if (slave->link != BOND_LINK_UP)
128ea6c3 278 speed = 0;
7bfc4753 279 else {
1da177e4
LT		 280 switch (slave->speed) {
281 case SPEED_10:
282 speed = AD_LINK_SPEED_BITMASK_10MBPS;
283 break;
284
285 case SPEED_100:
286 speed = AD_LINK_SPEED_BITMASK_100MBPS;
287 break;
288
289 case SPEED_1000:
290 speed = AD_LINK_SPEED_BITMASK_1000MBPS;
291 break;
292
94dbffd5
JV		 293 case SPEED_10000:
294 speed = AD_LINK_SPEED_BITMASK_10000MBPS;
295 break;
296
1da177e4 297 default:
3bf2d28a
VF		 298 /* unknown speed value from ethtool. shouldn't happen */
299 speed = 0;
1da177e4
LT		 300 break;
301 }
302 }
303
a4aee5c8
JP		 304 pr_debug("Port %d Received link speed %d update from adapter\n",
305 port->actor_port_number, speed);
1da177e4
LT		 306 return speed;
307}
308
309/**
310 * __get_duplex - get a port's duplex
311 * @port: the port we're looking at
312 *
313 * Return @port's duplex in 802.3ad bitmask format. i.e.:
314 * 0x01 if in full duplex
315 * 0x00 otherwise
316 */
317static u8 __get_duplex(struct port *port)
318{
319 struct slave *slave = port->slave;
320
321 u8 retval;
322
3bf2d28a
VF		 323 /* handling a special case: when the configuration starts with
324 * link down, it sets the duplex to 0.
325 */
7bfc4753 326 if (slave->link != BOND_LINK_UP)
128ea6c3 327 retval = 0x0;
7bfc4753 328 else {
1da177e4
LT		 329 switch (slave->duplex) {
330 case DUPLEX_FULL:
128ea6c3 331 retval = 0x1;
a4aee5c8
JP		 332 pr_debug("Port %d Received status full duplex update from adapter\n",
333 port->actor_port_number);
1da177e4
LT		 334 break;
335 case DUPLEX_HALF:
336 default:
128ea6c3 337 retval = 0x0;
a4aee5c8
JP		 338 pr_debug("Port %d Received status NOT full duplex update from adapter\n",
339 port->actor_port_number);
1da177e4
LT		 340 break;
341 }
342 }
343 return retval;
344}
345
346/**
9ac3524a 347 * __initialize_port_locks - initialize a port's STATE machine spinlock
e0809dbc 348 * @port: the slave of the port we're looking at
1da177e4 349 */
e0809dbc 350static inline void __initialize_port_locks(struct slave *slave)
1da177e4 351{
3bf2d28a 352 /* make sure it isn't called twice */
e0809dbc 353 spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
1da177e4
LT		 354}
355
3bf2d28a 356/* Conversions */
1da177e4
LT		 357
358/**
359 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
360 * @timer_type: which timer to operate
361 * @par: timer parameter. see below
362 *
363 * If @timer_type is %current_while_timer, @par indicates long/short timer.
364 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
3bf2d28a 365 * %SLOW_PERIODIC_TIME.
1da177e4
LT		 366 */
367static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
368{
128ea6c3 369 u16 retval = 0; /* to silence the compiler */
1da177e4
LT		 370
371 switch (timer_type) {
3bf2d28a 372 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
7bfc4753 373 if (par)
3bf2d28a 374 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
7bfc4753 375 else
3bf2d28a 376 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
1da177e4 377 break;
3bf2d28a 378 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
1da177e4
LT		 379 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
380 break;
3bf2d28a
VF		 381 case AD_PERIODIC_TIMER: /* for periodic machine */
382 retval = (par*ad_ticks_per_sec); /* long timeout */
1da177e4 383 break;
3bf2d28a 384 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
1da177e4
LT		 385 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
386 break;
3bf2d28a 387 case AD_WAIT_WHILE_TIMER: /* for selection machine */
1da177e4
LT		 388 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
389 break;
390 }
3bf2d28a 391
1da177e4
LT		 392 return retval;
393}
394
395
3bf2d28a 396/* ================= ad_rx_machine helper functions ================== */
1da177e4 397
2d6682db
JV		 398/**
399 * __choose_matched - update a port's matched variable from a received lacpdu
400 * @lacpdu: the lacpdu we've received
401 * @port: the port we're looking at
402 *
403 * Update the value of the matched variable, using parameter values from a
404 * newly received lacpdu. Parameter values for the partner carried in the
405 * received PDU are compared with the corresponding operational parameter
406 * values for the actor. Matched is set to TRUE if all of these parameters
407 * match and the PDU parameter partner_state.aggregation has the same value as
408 * actor_oper_port_state.aggregation and lacp will actively maintain the link
409 * in the aggregation. Matched is also set to TRUE if the value of
410 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
411 * an individual link and lacp will actively maintain the link. Otherwise,
412 * matched is set to FALSE. LACP is considered to be actively maintaining the
413 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
414 * the actor's actor_oper_port_state.lacp_activity and the PDU's
415 * partner_state.lacp_activity variables are TRUE.
416 *
417 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
418 * used here to implement the language from 802.3ad 43.4.9 that requires
419 * recordPDU to "match" the LACPDU parameters to the stored values.
420 */
421static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
422{
815117ad 423 /* check if all parameters are alike
424 * or this is individual link(aggregation == FALSE)
425 * then update the state machine Matched variable.
426 */
2d6682db
JV		 427 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
428 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
815117ad 429 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
2d6682db
JV		 430 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
431 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
432 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
2d6682db
JV		 433 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
434 ) {
2d6682db
JV		 435 port->sm_vars |= AD_PORT_MATCHED;
436 } else {
437 port->sm_vars &= ~AD_PORT_MATCHED;
438 }
439}
440
1da177e4
LT		 441/**
442 * __record_pdu - record parameters from a received lacpdu
443 * @lacpdu: the lacpdu we've received
444 * @port: the port we're looking at
445 *
446 * Record the parameter values for the Actor carried in a received lacpdu as
447 * the current partner operational parameter values and sets
448 * actor_oper_port_state.defaulted to FALSE.
449 */
450static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
451{
1da177e4 452 if (lacpdu && port) {
b99d6ba9
HE		 453 struct port_params *partner = &port->partner_oper;
454
2d6682db 455 __choose_matched(lacpdu, port);
3bf2d28a
VF		 456 /* record the new parameter values for the partner
457 * operational
458 */
b99d6ba9
HE		 459 partner->port_number = ntohs(lacpdu->actor_port);
460 partner->port_priority = ntohs(lacpdu->actor_port_priority);
461 partner->system = lacpdu->actor_system;
462 partner->system_priority = ntohs(lacpdu->actor_system_priority);
463 partner->key = ntohs(lacpdu->actor_key);
464 partner->port_state = lacpdu->actor_state;
1da177e4 465
3bf2d28a 466 /* set actor_oper_port_state.defaulted to FALSE */
1da177e4
LT		 467 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
468
3bf2d28a
VF		 469 /* set the partner sync. to on if the partner is sync,
470 * and the port is matched
471 */
7bfc4753
BD		 472 if ((port->sm_vars & AD_PORT_MATCHED)
473 && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
b99d6ba9 474 partner->port_state |= AD_STATE_SYNCHRONIZATION;
7bfc4753 475 else
b99d6ba9 476 partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
1da177e4
LT		 477 }
478}
479
480/**
481 * __record_default - record default parameters
482 * @port: the port we're looking at
483 *
484 * This function records the default parameter values for the partner carried
485 * in the Partner Admin parameters as the current partner operational parameter
486 * values and sets actor_oper_port_state.defaulted to TRUE.
487 */
488static void __record_default(struct port *port)
489{
1da177e4 490 if (port) {
3bf2d28a 491 /* record the partner admin parameters */
5eefd1ad
HE		 492 memcpy(&port->partner_oper, &port->partner_admin,
493 sizeof(struct port_params));
1da177e4 494
3bf2d28a 495 /* set actor_oper_port_state.defaulted to true */
1da177e4
LT		 496 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
497 }
498}
499
500/**
501 * __update_selected - update a port's Selected variable from a received lacpdu
502 * @lacpdu: the lacpdu we've received
503 * @port: the port we're looking at
504 *
505 * Update the value of the selected variable, using parameter values from a
506 * newly received lacpdu. The parameter values for the Actor carried in the
507 * received PDU are compared with the corresponding operational parameter
508 * values for the ports partner. If one or more of the comparisons shows that
509 * the value(s) received in the PDU differ from the current operational values,
510 * then selected is set to FALSE and actor_oper_port_state.synchronization is
511 * set to out_of_sync. Otherwise, selected remains unchanged.
512 */
513static void __update_selected(struct lacpdu *lacpdu, struct port *port)
514{
1da177e4 515 if (lacpdu && port) {
ce6a49ad
HE		 516 const struct port_params *partner = &port->partner_oper;
517
815117ad 518 /* check if any parameter is different then
519 * update the state machine selected variable.
520 */
8e95a202
JP		 521 if (ntohs(lacpdu->actor_port) != partner->port_number ||
522 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
815117ad 523 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
8e95a202
JP		 524 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
525 ntohs(lacpdu->actor_key) != partner->key ||
526 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
1da177e4
LT		 527 port->sm_vars &= ~AD_PORT_SELECTED;
528 }
529 }
530}
531
532/**
533 * __update_default_selected - update a port's Selected variable from Partner
534 * @port: the port we're looking at
535 *
536 * This function updates the value of the selected variable, using the partner
537 * administrative parameter values. The administrative values are compared with
538 * the corresponding operational parameter values for the partner. If one or
539 * more of the comparisons shows that the administrative value(s) differ from
540 * the current operational values, then Selected is set to FALSE and
541 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
542 * Selected remains unchanged.
543 */
544static void __update_default_selected(struct port *port)
545{
1da177e4 546 if (port) {
3c52065f
HE		 547 const struct port_params *admin = &port->partner_admin;
548 const struct port_params *oper = &port->partner_oper;
549
815117ad 550 /* check if any parameter is different then
551 * update the state machine selected variable.
552 */
8e95a202
JP		 553 if (admin->port_number != oper->port_number ||
554 admin->port_priority != oper->port_priority ||
815117ad 555 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
8e95a202
JP		 556 admin->system_priority != oper->system_priority ||
557 admin->key != oper->key ||
558 (admin->port_state & AD_STATE_AGGREGATION)
3c52065f 559 != (oper->port_state & AD_STATE_AGGREGATION)) {
1da177e4
LT		 560 port->sm_vars &= ~AD_PORT_SELECTED;
561 }
562 }
563}
564
1da177e4
LT		 565/**
566 * __update_ntt - update a port's ntt variable from a received lacpdu
567 * @lacpdu: the lacpdu we've received
568 * @port: the port we're looking at
569 *
570 * Updates the value of the ntt variable, using parameter values from a newly
571 * received lacpdu. The parameter values for the partner carried in the
572 * received PDU are compared with the corresponding operational parameter
573 * values for the Actor. If one or more of the comparisons shows that the
574 * value(s) received in the PDU differ from the current operational values,
575 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
576 */
577static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
578{
815117ad 579 /* validate lacpdu and port */
1da177e4 580 if (lacpdu && port) {
815117ad 581 /* check if any parameter is different then
582 * update the port->ntt.
583 */
89cc76f9
JV		 584 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
585 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
815117ad 586 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
89cc76f9
JV		 587 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
588 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
1da177e4
LT		 589 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
590 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
591 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
592 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
593 ) {
d238d458 594 port->ntt = true;
1da177e4
LT		 595 }
596 }
597}
598
1da177e4
LT		 599/**
600 * __agg_ports_are_ready - check if all ports in an aggregator are ready
601 * @aggregator: the aggregator we're looking at
602 *
603 */
604static int __agg_ports_are_ready(struct aggregator *aggregator)
605{
606 struct port *port;
607 int retval = 1;
608
609 if (aggregator) {
3bf2d28a
VF		 610 /* scan all ports in this aggregator to verfy if they are
611 * all ready.
612 */
128ea6c3
BD		 613 for (port = aggregator->lag_ports;
614 port;
615 port = port->next_port_in_aggregator) {
1da177e4
LT		 616 if (!(port->sm_vars & AD_PORT_READY_N)) {
617 retval = 0;
618 break;
619 }
620 }
621 }
622
623 return retval;
624}
625
626/**
627 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
628 * @aggregator: the aggregator we're looking at
629 * @val: Should the ports' ready bit be set on or off
630 *
631 */
632static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
633{
634 struct port *port;
635
128ea6c3
BD		 636 for (port = aggregator->lag_ports; port;
637 port = port->next_port_in_aggregator) {
7bfc4753 638 if (val)
1da177e4 639 port->sm_vars |= AD_PORT_READY;
7bfc4753 640 else
1da177e4 641 port->sm_vars &= ~AD_PORT_READY;
1da177e4
LT		 642 }
643}
644
645/**
646 * __get_agg_bandwidth - get the total bandwidth of an aggregator
647 * @aggregator: the aggregator we're looking at
648 *
649 */
650static u32 __get_agg_bandwidth(struct aggregator *aggregator)
651{
128ea6c3 652 u32 bandwidth = 0;
1da177e4
LT		 653
654 if (aggregator->num_of_ports) {
65cce19c 655 switch (__get_link_speed(aggregator->lag_ports)) {
1da177e4
LT		 656 case AD_LINK_SPEED_BITMASK_1MBPS:
657 bandwidth = aggregator->num_of_ports;
658 break;
659 case AD_LINK_SPEED_BITMASK_10MBPS:
660 bandwidth = aggregator->num_of_ports * 10;
661 break;
662 case AD_LINK_SPEED_BITMASK_100MBPS:
663 bandwidth = aggregator->num_of_ports * 100;
664 break;
665 case AD_LINK_SPEED_BITMASK_1000MBPS:
666 bandwidth = aggregator->num_of_ports * 1000;
667 break;
94dbffd5
JV		 668 case AD_LINK_SPEED_BITMASK_10000MBPS:
669 bandwidth = aggregator->num_of_ports * 10000;
670 break;
1da177e4 671 default:
3bf2d28a 672 bandwidth = 0; /* to silence the compiler */
1da177e4
LT		 673 }
674 }
675 return bandwidth;
676}
677
678/**
679 * __get_active_agg - get the current active aggregator
680 * @aggregator: the aggregator we're looking at
49b7624e
VF		 681 *
682 * Caller must hold RCU lock.
1da177e4
LT		 683 */
684static struct aggregator *__get_active_agg(struct aggregator *aggregator)
685{
19177e7d
VF		 686 struct bonding *bond = aggregator->slave->bond;
687 struct list_head *iter;
688 struct slave *slave;
1da177e4 689
be79bd04 690 bond_for_each_slave_rcu(bond, slave, iter)
49b7624e 691 if (SLAVE_AD_INFO(slave).aggregator.is_active)
19177e7d 692 return &(SLAVE_AD_INFO(slave).aggregator);
1da177e4 693
19177e7d 694 return NULL;
1da177e4
LT		 695}
696
697/**
698 * __update_lacpdu_from_port - update a port's lacpdu fields
699 * @port: the port we're looking at
1da177e4
LT		 700 */
701static inline void __update_lacpdu_from_port(struct port *port)
702{
703 struct lacpdu *lacpdu = &port->lacpdu;
3b5b35d0 704 const struct port_params *partner = &port->partner_oper;
1da177e4 705
3bf2d28a
VF		 706 /* update current actual Actor parameters
707 * lacpdu->subtype initialized
1da177e4
LT		 708 * lacpdu->version_number initialized
709 * lacpdu->tlv_type_actor_info initialized
710 * lacpdu->actor_information_length initialized
711 */
712
d3bb52b0 713 lacpdu->actor_system_priority = htons(port->actor_system_priority);
1da177e4 714 lacpdu->actor_system = port->actor_system;
d3bb52b0
AV		 715 lacpdu->actor_key = htons(port->actor_oper_port_key);
716 lacpdu->actor_port_priority = htons(port->actor_port_priority);
717 lacpdu->actor_port = htons(port->actor_port_number);
1da177e4
LT		 718 lacpdu->actor_state = port->actor_oper_port_state;
719
720 /* lacpdu->reserved_3_1 initialized
721 * lacpdu->tlv_type_partner_info initialized
722 * lacpdu->partner_information_length initialized
723 */
724
3b5b35d0
HE		 725 lacpdu->partner_system_priority = htons(partner->system_priority);
726 lacpdu->partner_system = partner->system;
727 lacpdu->partner_key = htons(partner->key);
728 lacpdu->partner_port_priority = htons(partner->port_priority);
729 lacpdu->partner_port = htons(partner->port_number);
730 lacpdu->partner_state = partner->port_state;
1da177e4
LT		 731
732 /* lacpdu->reserved_3_2 initialized
733 * lacpdu->tlv_type_collector_info initialized
734 * lacpdu->collector_information_length initialized
735 * collector_max_delay initialized
736 * reserved_12[12] initialized
737 * tlv_type_terminator initialized
738 * terminator_length initialized
739 * reserved_50[50] initialized
740 */
1da177e4
LT		 741}
742
3bf2d28a 743/* ================= main 802.3ad protocol code ========================= */
1da177e4
LT		 744
745/**
746 * ad_lacpdu_send - send out a lacpdu packet on a given port
747 * @port: the port we're looking at
748 *
749 * Returns: 0 on success
750 * < 0 on error
751 */
752static int ad_lacpdu_send(struct port *port)
753{
754 struct slave *slave = port->slave;
755 struct sk_buff *skb;
756 struct lacpdu_header *lacpdu_header;
757 int length = sizeof(struct lacpdu_header);
1da177e4
LT		 758
759 skb = dev_alloc_skb(length);
7bfc4753 760 if (!skb)
1da177e4 761 return -ENOMEM;
1da177e4
LT		 762
763 skb->dev = slave->dev;
459a98ed 764 skb_reset_mac_header(skb);
b0e380b1 765 skb->network_header = skb->mac_header + ETH_HLEN;
1da177e4
LT		 766 skb->protocol = PKT_TYPE_LACPDU;
767 skb->priority = TC_PRIO_CONTROL;
768
769 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
770
e727149e 771 memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
b595076a 772 /* Note: source address is set to be the member's PERMANENT address,
3bf2d28a
VF		 773 * because we use it to identify loopback lacpdus in receive.
774 */
e727149e
HE		 775 memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
776 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
1da177e4 777
3bf2d28a 778 lacpdu_header->lacpdu = port->lacpdu;
1da177e4
LT		 779
780 dev_queue_xmit(skb);
781
782 return 0;
783}
784
785/**
786 * ad_marker_send - send marker information/response on a given port
787 * @port: the port we're looking at
788 * @marker: marker data to send
789 *
790 * Returns: 0 on success
791 * < 0 on error
792 */
1c3f0b8e 793static int ad_marker_send(struct port *port, struct bond_marker *marker)
1da177e4
LT		 794{
795 struct slave *slave = port->slave;
796 struct sk_buff *skb;
1c3f0b8e
MD		 797 struct bond_marker_header *marker_header;
798 int length = sizeof(struct bond_marker_header);
1da177e4
LT		 799
800 skb = dev_alloc_skb(length + 16);
7bfc4753 801 if (!skb)
1da177e4 802 return -ENOMEM;
1da177e4
LT		 803
804 skb_reserve(skb, 16);
805
806 skb->dev = slave->dev;
459a98ed 807 skb_reset_mac_header(skb);
b0e380b1 808 skb->network_header = skb->mac_header + ETH_HLEN;
1da177e4
LT		 809 skb->protocol = PKT_TYPE_LACPDU;
810
1c3f0b8e 811 marker_header = (struct bond_marker_header *)skb_put(skb, length);
1da177e4 812
e727149e 813 memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
b595076a 814 /* Note: source address is set to be the member's PERMANENT address,
3bf2d28a
VF		 815 * because we use it to identify loopback MARKERs in receive.
816 */
e727149e
HE		 817 memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
818 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
1da177e4 819
3bf2d28a 820 marker_header->marker = *marker;
1da177e4
LT		 821
822 dev_queue_xmit(skb);
823
824 return 0;
825}
826
827/**
828 * ad_mux_machine - handle a port's mux state machine
829 * @port: the port we're looking at
1da177e4
LT		 830 */
831static void ad_mux_machine(struct port *port)
832{
833 mux_states_t last_state;
834
3bf2d28a
VF		 835 /* keep current State Machine state to compare later if it was
836 * changed
837 */
1da177e4
LT		 838 last_state = port->sm_mux_state;
839
840 if (port->sm_vars & AD_PORT_BEGIN) {
3bf2d28a 841 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 842 } else {
843 switch (port->sm_mux_state) {
844 case AD_MUX_DETACHED:
7bfc4753
BD		 845 if ((port->sm_vars & AD_PORT_SELECTED)
846 || (port->sm_vars & AD_PORT_STANDBY))
847 /* if SELECTED or STANDBY */
3bf2d28a 848 port->sm_mux_state = AD_MUX_WAITING;
1da177e4
LT		 849 break;
850 case AD_MUX_WAITING:
3bf2d28a
VF		 851 /* if SELECTED == FALSE return to DETACH state */
852 if (!(port->sm_vars & AD_PORT_SELECTED)) {
1da177e4 853 port->sm_vars &= ~AD_PORT_READY_N;
3bf2d28a
VF		 854 /* in order to withhold the Selection Logic to
855 * check all ports READY_N value every callback
856 * cycle to update ready variable, we check
857 * READY_N and update READY here
858 */
1da177e4 859 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
3bf2d28a 860 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 861 break;
862 }
863
3bf2d28a 864 /* check if the wait_while_timer expired */
7bfc4753
BD		 865 if (port->sm_mux_timer_counter
866 && !(--port->sm_mux_timer_counter))
1da177e4 867 port->sm_vars |= AD_PORT_READY_N;
1da177e4 868
3bf2d28a
VF		 869 /* in order to withhold the selection logic to check
870 * all ports READY_N value every callback cycle to
871 * update ready variable, we check READY_N and update
872 * READY here
873 */
1da177e4
LT		 874 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
875
3bf2d28a
VF		 876 /* if the wait_while_timer expired, and the port is
877 * in READY state, move to ATTACHED state
878 */
7bfc4753
BD		 879 if ((port->sm_vars & AD_PORT_READY)
880 && !port->sm_mux_timer_counter)
3bf2d28a 881 port->sm_mux_state = AD_MUX_ATTACHED;
1da177e4
LT		 882 break;
883 case AD_MUX_ATTACHED:
3bf2d28a
VF		 884 /* check also if agg_select_timer expired (so the
885 * edable port will take place only after this timer)
886 */
887 if ((port->sm_vars & AD_PORT_SELECTED) &&
888 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
889 !__check_agg_selection_timer(port)) {
890 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;
891 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
892 (port->sm_vars & AD_PORT_STANDBY)) {
893 /* if UNSELECTED or STANDBY */
1da177e4 894 port->sm_vars &= ~AD_PORT_READY_N;
3bf2d28a
VF		 895 /* in order to withhold the selection logic to
896 * check all ports READY_N value every callback
897 * cycle to update ready variable, we check
898 * READY_N and update READY here
899 */
1da177e4 900 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
3bf2d28a 901 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 902 }
903 break;
904 case AD_MUX_COLLECTING_DISTRIBUTING:
3bf2d28a
VF		 905 if (!(port->sm_vars & AD_PORT_SELECTED) ||
906 (port->sm_vars & AD_PORT_STANDBY) ||
907 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)) {
908 port->sm_mux_state = AD_MUX_ATTACHED;
1da177e4 909 } else {
3bf2d28a
VF		 910 /* if port state hasn't changed make
911 * sure that a collecting distributing
912 * port in an active aggregator is enabled
913 */
1da177e4
LT		 914 if (port->aggregator &&
915 port->aggregator->is_active &&
916 !__port_is_enabled(port)) {
917
918 __enable_port(port);
919 }
920 }
921 break;
3bf2d28a 922 default:
1da177e4
LT		 923 break;
924 }
925 }
926
3bf2d28a 927 /* check if the state machine was changed */
1da177e4 928 if (port->sm_mux_state != last_state) {
a4aee5c8
JP		 929 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
930 port->actor_port_number, last_state,
931 port->sm_mux_state);
1da177e4
LT		 932 switch (port->sm_mux_state) {
933 case AD_MUX_DETACHED:
1da177e4
LT		 934 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
935 ad_disable_collecting_distributing(port);
936 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
937 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
d238d458 938 port->ntt = true;
1da177e4
LT		 939 break;
940 case AD_MUX_WAITING:
941 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
942 break;
943 case AD_MUX_ATTACHED:
1da177e4
LT		 944 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
945 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
946 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
947 ad_disable_collecting_distributing(port);
d238d458 948 port->ntt = true;
1da177e4
LT		 949 break;
950 case AD_MUX_COLLECTING_DISTRIBUTING:
951 port->actor_oper_port_state |= AD_STATE_COLLECTING;
952 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
953 ad_enable_collecting_distributing(port);
d238d458 954 port->ntt = true;
1da177e4 955 break;
3bf2d28a 956 default:
1da177e4
LT		 957 break;
958 }
959 }
960}
961
962/**
963 * ad_rx_machine - handle a port's rx State Machine
964 * @lacpdu: the lacpdu we've received
965 * @port: the port we're looking at
966 *
967 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
968 * CURRENT. If timer expired set the state machine in the proper state.
969 * In other cases, this function checks if we need to switch to other state.
970 */
971static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
972{
973 rx_states_t last_state;
974
3bf2d28a
VF		 975 /* keep current State Machine state to compare later if it was
976 * changed
977 */
1da177e4
LT		 978 last_state = port->sm_rx_state;
979
3bf2d28a
VF		 980 /* check if state machine should change state */
981
982 /* first, check if port was reinitialized */
7bfc4753 983 if (port->sm_vars & AD_PORT_BEGIN)
7bfc4753 984 port->sm_rx_state = AD_RX_INITIALIZE;
3bf2d28a 985 /* check if port is not enabled */
7bfc4753
BD		 986 else if (!(port->sm_vars & AD_PORT_BEGIN)
987 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
7bfc4753 988 port->sm_rx_state = AD_RX_PORT_DISABLED;
3bf2d28a
VF		 989 /* check if new lacpdu arrived */
990 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
991 (port->sm_rx_state == AD_RX_DEFAULTED) ||
992 (port->sm_rx_state == AD_RX_CURRENT))) {
993 port->sm_rx_timer_counter = 0;
1da177e4
LT		 994 port->sm_rx_state = AD_RX_CURRENT;
995 } else {
3bf2d28a
VF		 996 /* if timer is on, and if it is expired */
997 if (port->sm_rx_timer_counter &&
998 !(--port->sm_rx_timer_counter)) {
1da177e4
LT		 999 switch (port->sm_rx_state) {
1000 case AD_RX_EXPIRED:
3bf2d28a 1001 port->sm_rx_state = AD_RX_DEFAULTED;
1da177e4
LT		 1002 break;
1003 case AD_RX_CURRENT:
3bf2d28a 1004 port->sm_rx_state = AD_RX_EXPIRED;
1da177e4 1005 break;
3bf2d28a 1006 default:
1da177e4
LT		 1007 break;
1008 }
1009 } else {
3bf2d28a 1010 /* if no lacpdu arrived and no timer is on */
1da177e4
LT		 1011 switch (port->sm_rx_state) {
1012 case AD_RX_PORT_DISABLED:
7bfc4753 1013 if (port->sm_vars & AD_PORT_MOVED)
3bf2d28a 1014 port->sm_rx_state = AD_RX_INITIALIZE;
7bfc4753
BD		 1015 else if (port->is_enabled
1016 && (port->sm_vars
1017 & AD_PORT_LACP_ENABLED))
3bf2d28a 1018 port->sm_rx_state = AD_RX_EXPIRED;
7bfc4753
BD		 1019 else if (port->is_enabled
1020 && ((port->sm_vars
1021 & AD_PORT_LACP_ENABLED) == 0))
3bf2d28a 1022 port->sm_rx_state = AD_RX_LACP_DISABLED;
1da177e4 1023 break;
3bf2d28a 1024 default:
1da177e4
LT		 1025 break;
1026
1027 }
1028 }
1029 }
1030
3bf2d28a 1031 /* check if the State machine was changed or new lacpdu arrived */
1da177e4 1032 if ((port->sm_rx_state != last_state) || (lacpdu)) {
a4aee5c8
JP		 1033 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1034 port->actor_port_number, last_state,
1035 port->sm_rx_state);
1da177e4
LT		 1036 switch (port->sm_rx_state) {
1037 case AD_RX_INITIALIZE:
7bfc4753 1038 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1da177e4 1039 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
7bfc4753 1040 else
1da177e4 1041 port->sm_vars |= AD_PORT_LACP_ENABLED;
1da177e4
LT		 1042 port->sm_vars &= ~AD_PORT_SELECTED;
1043 __record_default(port);
1044 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1045 port->sm_vars &= ~AD_PORT_MOVED;
3bf2d28a 1046 port->sm_rx_state = AD_RX_PORT_DISABLED;
1da177e4 1047
3bf2d28a 1048 /* Fall Through */
1da177e4
LT		 1049 case AD_RX_PORT_DISABLED:
1050 port->sm_vars &= ~AD_PORT_MATCHED;
1051 break;
1052 case AD_RX_LACP_DISABLED:
1053 port->sm_vars &= ~AD_PORT_SELECTED;
1054 __record_default(port);
1055c9ab 1055 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1da177e4
LT		 1056 port->sm_vars |= AD_PORT_MATCHED;
1057 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1058 break;
1059 case AD_RX_EXPIRED:
3bf2d28a
VF		 1060 /* Reset of the Synchronization flag (Standard 43.4.12)
1061 * This reset cause to disable this port in the
1062 * COLLECTING_DISTRIBUTING state of the mux machine in
1063 * case of EXPIRED even if LINK_DOWN didn't arrive for
1064 * the port.
1065 */
1055c9ab 1066 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1da177e4 1067 port->sm_vars &= ~AD_PORT_MATCHED;
3bf2d28a 1068 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1da177e4
LT		 1069 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1070 port->actor_oper_port_state |= AD_STATE_EXPIRED;
1071 break;
1072 case AD_RX_DEFAULTED:
1073 __update_default_selected(port);
1074 __record_default(port);
1075 port->sm_vars |= AD_PORT_MATCHED;
1076 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1077 break;
1078 case AD_RX_CURRENT:
815117ad 1079 /* detect loopback situation */
3bf2d28a
VF		 1080 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1081 &(port->actor_system))) {
1082 pr_err("%s: An illegal loopback occurred on adapter (%s).\nCheck the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1083 port->slave->bond->dev->name,
1084 port->slave->dev->name);
1da177e4
LT		 1085 return;
1086 }
1087 __update_selected(lacpdu, port);
1088 __update_ntt(lacpdu, port);
1089 __record_pdu(lacpdu, port);
1da177e4
LT		 1090 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1091 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1da177e4 1092 break;
3bf2d28a 1093 default:
1da177e4
LT		 1094 break;
1095 }
1096 }
1da177e4
LT		 1097}
1098
1099/**
1100 * ad_tx_machine - handle a port's tx state machine
1101 * @port: the port we're looking at
1da177e4
LT		 1102 */
1103static void ad_tx_machine(struct port *port)
1104{
3bf2d28a
VF		 1105 /* check if tx timer expired, to verify that we do not send more than
1106 * 3 packets per second
1107 */
1da177e4 1108 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
3bf2d28a 1109 /* check if there is something to send */
1da177e4
LT		 1110 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1111 __update_lacpdu_from_port(port);
d238d458 1112
1da177e4 1113 if (ad_lacpdu_send(port) >= 0) {
a4aee5c8
JP		 1114 pr_debug("Sent LACPDU on port %d\n",
1115 port->actor_port_number);
d238d458 1116
3bf2d28a
VF		 1117 /* mark ntt as false, so it will not be sent
1118 * again until demanded
1119 */
d238d458 1120 port->ntt = false;
1da177e4
LT		 1121 }
1122 }
3bf2d28a
VF		 1123 /* restart tx timer(to verify that we will not exceed
1124 * AD_MAX_TX_IN_SECOND
1125 */
1126 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1da177e4
LT		 1127 }
1128}
1129
1130/**
1131 * ad_periodic_machine - handle a port's periodic state machine
1132 * @port: the port we're looking at
1133 *
1134 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1135 */
1136static void ad_periodic_machine(struct port *port)
1137{
1138 periodic_states_t last_state;
1139
3bf2d28a 1140 /* keep current state machine state to compare later if it was changed */
1da177e4
LT		 1141 last_state = port->sm_periodic_state;
1142
3bf2d28a 1143 /* check if port was reinitialized */
1da177e4 1144 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1055c9ab 1145 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1da177e4 1146 ) {
3bf2d28a 1147 port->sm_periodic_state = AD_NO_PERIODIC;
1da177e4 1148 }
3bf2d28a 1149 /* check if state machine should change state */
1da177e4 1150 else if (port->sm_periodic_timer_counter) {
3bf2d28a 1151 /* check if periodic state machine expired */
1da177e4 1152 if (!(--port->sm_periodic_timer_counter)) {
3bf2d28a
VF		 1153 /* if expired then do tx */
1154 port->sm_periodic_state = AD_PERIODIC_TX;
1da177e4 1155 } else {
3bf2d28a
VF		 1156 /* If not expired, check if there is some new timeout
1157 * parameter from the partner state
1158 */
1da177e4
LT		 1159 switch (port->sm_periodic_state) {
1160 case AD_FAST_PERIODIC:
7bfc4753
BD		 1161 if (!(port->partner_oper.port_state
1162 & AD_STATE_LACP_TIMEOUT))
3bf2d28a 1163 port->sm_periodic_state = AD_SLOW_PERIODIC;
1da177e4
LT		 1164 break;
1165 case AD_SLOW_PERIODIC:
1055c9ab 1166 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1da177e4 1167 port->sm_periodic_timer_counter = 0;
3bf2d28a 1168 port->sm_periodic_state = AD_PERIODIC_TX;
1da177e4
LT		 1169 }
1170 break;
3bf2d28a 1171 default:
1da177e4
LT		 1172 break;
1173 }
1174 }
1175 } else {
1176 switch (port->sm_periodic_state) {
1177 case AD_NO_PERIODIC:
3bf2d28a 1178 port->sm_periodic_state = AD_FAST_PERIODIC;
1da177e4
LT		 1179 break;
1180 case AD_PERIODIC_TX:
3bf2d28a
VF		 1181 if (!(port->partner_oper.port_state &
1182 AD_STATE_LACP_TIMEOUT))
1183 port->sm_periodic_state = AD_SLOW_PERIODIC;
7bfc4753 1184 else
3bf2d28a 1185 port->sm_periodic_state = AD_FAST_PERIODIC;
1da177e4 1186 break;
3bf2d28a 1187 default:
1da177e4
LT		 1188 break;
1189 }
1190 }
1191
3bf2d28a 1192 /* check if the state machine was changed */
1da177e4 1193 if (port->sm_periodic_state != last_state) {
a4aee5c8
JP		 1194 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1195 port->actor_port_number, last_state,
1196 port->sm_periodic_state);
1da177e4
LT		 1197 switch (port->sm_periodic_state) {
1198 case AD_NO_PERIODIC:
3bf2d28a 1199 port->sm_periodic_timer_counter = 0;
1da177e4
LT		 1200 break;
1201 case AD_FAST_PERIODIC:
3bf2d28a
VF		 1202 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1203 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1da177e4
LT		 1204 break;
1205 case AD_SLOW_PERIODIC:
3bf2d28a
VF		 1206 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1207 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1da177e4
LT		 1208 break;
1209 case AD_PERIODIC_TX:
d238d458 1210 port->ntt = true;
1da177e4 1211 break;
3bf2d28a 1212 default:
1da177e4
LT		 1213 break;
1214 }
1215 }
1216}
1217
1218/**
1219 * ad_port_selection_logic - select aggregation groups
1220 * @port: the port we're looking at
1221 *
1222 * Select aggregation groups, and assign each port for it's aggregetor. The
1223 * selection logic is called in the inititalization (after all the handshkes),
1224 * and after every lacpdu receive (if selected is off).
1225 */
1226static void ad_port_selection_logic(struct port *port)
1227{
1228 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1229 struct port *last_port = NULL, *curr_port;
3e36bb75
VF		 1230 struct list_head *iter;
1231 struct bonding *bond;
1232 struct slave *slave;
1da177e4
LT		 1233 int found = 0;
1234
3bf2d28a 1235 /* if the port is already Selected, do nothing */
7bfc4753 1236 if (port->sm_vars & AD_PORT_SELECTED)
1da177e4 1237 return;
1da177e4 1238
3e36bb75
VF		 1239 bond = __get_bond_by_port(port);
1240
3bf2d28a 1241 /* if the port is connected to other aggregator, detach it */
1da177e4 1242 if (port->aggregator) {
3bf2d28a 1243 /* detach the port from its former aggregator */
128ea6c3
BD		 1244 temp_aggregator = port->aggregator;
1245 for (curr_port = temp_aggregator->lag_ports; curr_port;
1246 last_port = curr_port,
3bf2d28a 1247 curr_port = curr_port->next_port_in_aggregator) {
1da177e4
LT		 1248 if (curr_port == port) {
1249 temp_aggregator->num_of_ports--;
3bf2d28a
VF		 1250 /* if it is the first port attached to the
1251 * aggregator
1252 */
1253 if (!last_port) {
128ea6c3
BD		 1254 temp_aggregator->lag_ports =
1255 port->next_port_in_aggregator;
3bf2d28a
VF		 1256 } else {
1257 /* not the first port attached to the
1258 * aggregator
1259 */
128ea6c3
BD		 1260 last_port->next_port_in_aggregator =
1261 port->next_port_in_aggregator;
1da177e4
LT		 1262 }
1263
3bf2d28a
VF		 1264 /* clear the port's relations to this
1265 * aggregator
1266 */
1da177e4 1267 port->aggregator = NULL;
128ea6c3
BD		 1268 port->next_port_in_aggregator = NULL;
1269 port->actor_port_aggregator_identifier = 0;
1da177e4 1270
a4aee5c8
JP		 1271 pr_debug("Port %d left LAG %d\n",
1272 port->actor_port_number,
1273 temp_aggregator->aggregator_identifier);
3bf2d28a
VF		 1274 /* if the aggregator is empty, clear its
1275 * parameters, and set it ready to be attached
1276 */
7bfc4753 1277 if (!temp_aggregator->lag_ports)
1da177e4 1278 ad_clear_agg(temp_aggregator);
1da177e4
LT		 1279 break;
1280 }
1281 }
3bf2d28a
VF		 1282 if (!curr_port) {
1283 /* meaning: the port was related to an aggregator
1284 * but was not on the aggregator port list
1285 */
ed3587fa
VF		 1286 pr_warn("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1287 port->slave->bond->dev->name,
1288 port->actor_port_number,
1289 port->slave->dev->name,
1290 port->aggregator->aggregator_identifier);
1da177e4
LT		 1291 }
1292 }
3bf2d28a 1293 /* search on all aggregators for a suitable aggregator for this port */
3e36bb75
VF		 1294 bond_for_each_slave(bond, slave, iter) {
1295 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1da177e4 1296
3bf2d28a 1297 /* keep a free aggregator for later use(if needed) */
1da177e4 1298 if (!aggregator->lag_ports) {
7bfc4753 1299 if (!free_aggregator)
128ea6c3 1300 free_aggregator = aggregator;
1da177e4
LT		 1301 continue;
1302 }
815117ad 1303 /* check if current aggregator suits us */
1304 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1305 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1055c9ab
HE		 1306 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1307 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1da177e4 1308 ) &&
815117ad 1309 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1310 !aggregator->is_individual) /* but is not individual OR */
1da177e4
LT		 1311 )
1312 ) {
815117ad 1313 /* attach to the founded aggregator */
1da177e4 1314 port->aggregator = aggregator;
128ea6c3
BD		 1315 port->actor_port_aggregator_identifier =
1316 port->aggregator->aggregator_identifier;
1317 port->next_port_in_aggregator = aggregator->lag_ports;
1da177e4 1318 port->aggregator->num_of_ports++;
128ea6c3 1319 aggregator->lag_ports = port;
a4aee5c8
JP		 1320 pr_debug("Port %d joined LAG %d(existing LAG)\n",
1321 port->actor_port_number,
1322 port->aggregator->aggregator_identifier);
1da177e4 1323
3bf2d28a 1324 /* mark this port as selected */
1da177e4
LT		 1325 port->sm_vars |= AD_PORT_SELECTED;
1326 found = 1;
1327 break;
1328 }
1329 }
1330
3bf2d28a
VF		 1331 /* the port couldn't find an aggregator - attach it to a new
1332 * aggregator
1333 */
1da177e4
LT		 1334 if (!found) {
1335 if (free_aggregator) {
3bf2d28a 1336 /* assign port a new aggregator */
1da177e4 1337 port->aggregator = free_aggregator;
128ea6c3
BD		 1338 port->actor_port_aggregator_identifier =
1339 port->aggregator->aggregator_identifier;
1da177e4 1340
3bf2d28a
VF		 1341 /* update the new aggregator's parameters
1342 * if port was responsed from the end-user
1343 */
7bfc4753
BD		 1344 if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1345 /* if port is full duplex */
1624db7b 1346 port->aggregator->is_individual = false;
7bfc4753 1347 else
1624db7b 1348 port->aggregator->is_individual = true;
1da177e4
LT		 1349
1350 port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1351 port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
128ea6c3
BD		 1352 port->aggregator->partner_system =
1353 port->partner_oper.system;
1354 port->aggregator->partner_system_priority =
1355 port->partner_oper.system_priority;
1055c9ab 1356 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1da177e4
LT		 1357 port->aggregator->receive_state = 1;
1358 port->aggregator->transmit_state = 1;
1359 port->aggregator->lag_ports = port;
1360 port->aggregator->num_of_ports++;
1361
3bf2d28a 1362 /* mark this port as selected */
1da177e4
LT		 1363 port->sm_vars |= AD_PORT_SELECTED;
1364
a4aee5c8
JP		 1365 pr_debug("Port %d joined LAG %d(new LAG)\n",
1366 port->actor_port_number,
1367 port->aggregator->aggregator_identifier);
1da177e4 1368 } else {
a4aee5c8 1369 pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
471cb5a3 1370 port->slave->bond->dev->name,
1da177e4
LT		 1371 port->actor_port_number, port->slave->dev->name);
1372 }
1373 }
3bf2d28a
VF		 1374 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1375 * in all aggregator's ports, else set ready=FALSE in all
1376 * aggregator's ports
1377 */
1378 __set_agg_ports_ready(port->aggregator,
1379 __agg_ports_are_ready(port->aggregator));
1da177e4 1380
fd989c83
JV		 1381 aggregator = __get_first_agg(port);
1382 ad_agg_selection_logic(aggregator);
1383}
1384
3bf2d28a 1385/* Decide if "agg" is a better choice for the new active aggregator that
fd989c83
JV		 1386 * the current best, according to the ad_select policy.
1387 */
1388static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1389 struct aggregator *curr)
1390{
3bf2d28a 1391 /* 0. If no best, select current.
fd989c83
JV		 1392 *
1393 * 1. If the current agg is not individual, and the best is
1394 * individual, select current.
1395 *
1396 * 2. If current agg is individual and the best is not, keep best.
1397 *
1398 * 3. Therefore, current and best are both individual or both not
1399 * individual, so:
1400 *
1401 * 3a. If current agg partner replied, and best agg partner did not,
1402 * select current.
1403 *
1404 * 3b. If current agg partner did not reply and best agg partner
1405 * did reply, keep best.
1406 *
1407 * 4. Therefore, current and best both have partner replies or
1408 * both do not, so perform selection policy:
1409 *
1410 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1411 * select by bandwidth.
1412 *
1413 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1414 */
1415 if (!best)
1416 return curr;
1417
1418 if (!curr->is_individual && best->is_individual)
1419 return curr;
1420
1421 if (curr->is_individual && !best->is_individual)
1422 return best;
1423
1424 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1425 return curr;
1426
1427 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1428 return best;
1429
1430 switch (__get_agg_selection_mode(curr->lag_ports)) {
1431 case BOND_AD_COUNT:
1432 if (curr->num_of_ports > best->num_of_ports)
1433 return curr;
1434
1435 if (curr->num_of_ports < best->num_of_ports)
1436 return best;
1437
1438 /*FALLTHROUGH*/
1439 case BOND_AD_STABLE:
1440 case BOND_AD_BANDWIDTH:
1441 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1442 return curr;
1443
1444 break;
1445
1446 default:
ed3587fa
VF		 1447 pr_warn("%s: Impossible agg select mode %d\n",
1448 curr->slave->bond->dev->name,
1449 __get_agg_selection_mode(curr->lag_ports));
fd989c83 1450 break;
1da177e4 1451 }
fd989c83
JV		 1452
1453 return best;
1da177e4
LT		 1454}
1455
4cd6fe1c
SH		 1456static int agg_device_up(const struct aggregator *agg)
1457{
2430af8b 1458 struct port *port = agg->lag_ports;
3bf2d28a 1459
2430af8b
JB		 1460 if (!port)
1461 return 0;
3bf2d28a
VF		 1462
1463 return netif_running(port->slave->dev) &&
1464 netif_carrier_ok(port->slave->dev);
4cd6fe1c
SH		 1465}
1466
1da177e4
LT		 1467/**
1468 * ad_agg_selection_logic - select an aggregation group for a team
1469 * @aggregator: the aggregator we're looking at
1470 *
1471 * It is assumed that only one aggregator may be selected for a team.
fd989c83
JV		 1472 *
1473 * The logic of this function is to select the aggregator according to
1474 * the ad_select policy:
1475 *
1476 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1477 * it, and to reselect the active aggregator only if the previous
1478 * aggregator has no more ports related to it.
1479 *
1480 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1481 * bandwidth, and reselect whenever a link state change takes place or the
1482 * set of slaves in the bond changes.
1483 *
1484 * BOND_AD_COUNT: select the aggregator with largest number of ports
1485 * (slaves), and reselect whenever a link state change takes place or the
1486 * set of slaves in the bond changes.
1da177e4
LT		 1487 *
1488 * FIXME: this function MUST be called with the first agg in the bond, or
1489 * __get_active_agg() won't work correctly. This function should be better
1490 * called with the bond itself, and retrieve the first agg from it.
1491 */
fd989c83 1492static void ad_agg_selection_logic(struct aggregator *agg)
1da177e4 1493{
fd989c83 1494 struct aggregator *best, *active, *origin;
bef1fcce
VF		 1495 struct bonding *bond = agg->slave->bond;
1496 struct list_head *iter;
1497 struct slave *slave;
1da177e4 1498 struct port *port;
1da177e4 1499
49b7624e 1500 rcu_read_lock();
fd989c83 1501 origin = agg;
fd989c83 1502 active = __get_active_agg(agg);
4cd6fe1c 1503 best = (active && agg_device_up(active)) ? active : NULL;
1da177e4 1504
be79bd04 1505 bond_for_each_slave_rcu(bond, slave, iter) {
bef1fcce
VF		 1506 agg = &(SLAVE_AD_INFO(slave).aggregator);
1507
fd989c83
JV		 1508 agg->is_active = 0;
1509
4cd6fe1c 1510 if (agg->num_of_ports && agg_device_up(agg))
fd989c83 1511 best = ad_agg_selection_test(best, agg);
bef1fcce 1512 }
fd989c83
JV		 1513
1514 if (best &&
1515 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
3bf2d28a 1516 /* For the STABLE policy, don't replace the old active
fd989c83
JV		 1517 * aggregator if it's still active (it has an answering
1518 * partner) or if both the best and active don't have an
1519 * answering partner.
1520 */
1521 if (active && active->lag_ports &&
1522 active->lag_ports->is_enabled &&
1523 (__agg_has_partner(active) ||
3bf2d28a
VF		 1524 (!__agg_has_partner(active) &&
1525 !__agg_has_partner(best)))) {
fd989c83
JV		 1526 if (!(!active->actor_oper_aggregator_key &&
1527 best->actor_oper_aggregator_key)) {
1528 best = NULL;
1529 active->is_active = 1;
1da177e4
LT		 1530 }
1531 }
fd989c83 1532 }
1da177e4 1533
fd989c83
JV		 1534 if (best && (best == active)) {
1535 best = NULL;
1536 active->is_active = 1;
1da177e4
LT		 1537 }
1538
be79bd04 1539 /* if there is new best aggregator, activate it */
fd989c83 1540 if (best) {
5a03cdb7 1541 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
a4aee5c8
JP		 1542 best->aggregator_identifier, best->num_of_ports,
1543 best->actor_oper_aggregator_key,
1544 best->partner_oper_aggregator_key,
1545 best->is_individual, best->is_active);
5a03cdb7 1546 pr_debug("best ports %p slave %p %s\n",
a4aee5c8
JP		 1547 best->lag_ports, best->slave,
1548 best->slave ? best->slave->dev->name : "NULL");
fd989c83 1549
be79bd04 1550 bond_for_each_slave_rcu(bond, slave, iter) {
bef1fcce 1551 agg = &(SLAVE_AD_INFO(slave).aggregator);
fd989c83 1552
5a03cdb7 1553 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
a4aee5c8
JP		 1554 agg->aggregator_identifier, agg->num_of_ports,
1555 agg->actor_oper_aggregator_key,
1556 agg->partner_oper_aggregator_key,
1557 agg->is_individual, agg->is_active);
1da177e4
LT		 1558 }
1559
be79bd04 1560 /* check if any partner replys */
fd989c83 1561 if (best->is_individual) {
ed3587fa 1562 pr_warn("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
be79bd04 1563 best->slave ?
1564 best->slave->bond->dev->name : "NULL");
1da177e4
LT		 1565 }
1566
fd989c83 1567 best->is_active = 1;
5a03cdb7 1568 pr_debug("LAG %d chosen as the active LAG\n",
a4aee5c8 1569 best->aggregator_identifier);
5a03cdb7 1570 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
a4aee5c8
JP		 1571 best->aggregator_identifier, best->num_of_ports,
1572 best->actor_oper_aggregator_key,
1573 best->partner_oper_aggregator_key,
1574 best->is_individual, best->is_active);
1da177e4 1575
3bf2d28a
VF		 1576 /* disable the ports that were related to the former
1577 * active_aggregator
1578 */
fd989c83
JV		 1579 if (active) {
1580 for (port = active->lag_ports; port;
1581 port = port->next_port_in_aggregator) {
1da177e4
LT		 1582 __disable_port(port);
1583 }
1584 }
1585 }
1586
3bf2d28a 1587 /* if the selected aggregator is of join individuals
fd989c83
JV		 1588 * (partner_system is NULL), enable their ports
1589 */
1590 active = __get_active_agg(origin);
1da177e4 1591
fd989c83
JV		 1592 if (active) {
1593 if (!__agg_has_partner(active)) {
1594 for (port = active->lag_ports; port;
1595 port = port->next_port_in_aggregator) {
1da177e4
LT		 1596 __enable_port(port);
1597 }
1598 }
1599 }
fd989c83 1600
be79bd04 1601 rcu_read_unlock();
1602
bef1fcce 1603 bond_3ad_set_carrier(bond);
1da177e4
LT		 1604}
1605
1606/**
1607 * ad_clear_agg - clear a given aggregator's parameters
1608 * @aggregator: the aggregator we're looking at
1da177e4
LT		 1609 */
1610static void ad_clear_agg(struct aggregator *aggregator)
1611{
1612 if (aggregator) {
1624db7b 1613 aggregator->is_individual = false;
1da177e4
LT		 1614 aggregator->actor_admin_aggregator_key = 0;
1615 aggregator->actor_oper_aggregator_key = 0;
1616 aggregator->partner_system = null_mac_addr;
1617 aggregator->partner_system_priority = 0;
1618 aggregator->partner_oper_aggregator_key = 0;
1619 aggregator->receive_state = 0;
1620 aggregator->transmit_state = 0;
1621 aggregator->lag_ports = NULL;
1622 aggregator->is_active = 0;
1623 aggregator->num_of_ports = 0;
a4aee5c8
JP		 1624 pr_debug("LAG %d was cleared\n",
1625 aggregator->aggregator_identifier);
1da177e4
LT		 1626 }
1627}
1628
1629/**
1630 * ad_initialize_agg - initialize a given aggregator's parameters
1631 * @aggregator: the aggregator we're looking at
1da177e4
LT		 1632 */
1633static void ad_initialize_agg(struct aggregator *aggregator)
1634{
1635 if (aggregator) {
1636 ad_clear_agg(aggregator);
1637
1638 aggregator->aggregator_mac_address = null_mac_addr;
1639 aggregator->aggregator_identifier = 0;
1640 aggregator->slave = NULL;
1641 }
1642}
1643
1644/**
1645 * ad_initialize_port - initialize a given port's parameters
1646 * @aggregator: the aggregator we're looking at
1647 * @lacp_fast: boolean. whether fast periodic should be used
1da177e4
LT		 1648 */
1649static void ad_initialize_port(struct port *port, int lacp_fast)
1650{
c7e703d0
HE		 1651 static const struct port_params tmpl = {
1652 .system_priority = 0xffff,
1653 .key = 1,
1654 .port_number = 1,
1655 .port_priority = 0xff,
1656 .port_state = 1,
1657 };
7addeef6
HE		 1658 static const struct lacpdu lacpdu = {
1659 .subtype = 0x01,
1660 .version_number = 0x01,
1661 .tlv_type_actor_info = 0x01,
1662 .actor_information_length = 0x14,
1663 .tlv_type_partner_info = 0x02,
1664 .partner_information_length = 0x14,
1665 .tlv_type_collector_info = 0x03,
1666 .collector_information_length = 0x10,
1667 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1668 };
c7e703d0 1669
1da177e4
LT		 1670 if (port) {
1671 port->actor_port_number = 1;
1672 port->actor_port_priority = 0xff;
1673 port->actor_system = null_mac_addr;
1674 port->actor_system_priority = 0xffff;
1675 port->actor_port_aggregator_identifier = 0;
d238d458 1676 port->ntt = false;
1da177e4
LT		 1677 port->actor_admin_port_key = 1;
1678 port->actor_oper_port_key = 1;
3bf2d28a
VF		 1679 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1680 AD_STATE_LACP_ACTIVITY;
1681 port->actor_oper_port_state = AD_STATE_AGGREGATION |
1682 AD_STATE_LACP_ACTIVITY;
1da177e4 1683
7bfc4753 1684 if (lacp_fast)
1da177e4 1685 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1da177e4 1686
c7e703d0
HE		 1687 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1688 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1689
f48127b6 1690 port->is_enabled = true;
3bf2d28a 1691 /* private parameters */
1da177e4
LT		 1692 port->sm_vars = 0x3;
1693 port->sm_rx_state = 0;
1694 port->sm_rx_timer_counter = 0;
1695 port->sm_periodic_state = 0;
1696 port->sm_periodic_timer_counter = 0;
1697 port->sm_mux_state = 0;
1698 port->sm_mux_timer_counter = 0;
1699 port->sm_tx_state = 0;
1700 port->sm_tx_timer_counter = 0;
1701 port->slave = NULL;
1702 port->aggregator = NULL;
1703 port->next_port_in_aggregator = NULL;
1704 port->transaction_id = 0;
1705
7addeef6 1706 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1da177e4
LT		 1707 }
1708}
1709
1710/**
1711 * ad_enable_collecting_distributing - enable a port's transmit/receive
1712 * @port: the port we're looking at
1713 *
1714 * Enable @port if it's in an active aggregator
1715 */
1716static void ad_enable_collecting_distributing(struct port *port)
1717{
1718 if (port->aggregator->is_active) {
a4aee5c8
JP		 1719 pr_debug("Enabling port %d(LAG %d)\n",
1720 port->actor_port_number,
1721 port->aggregator->aggregator_identifier);
1da177e4
LT		 1722 __enable_port(port);
1723 }
1724}
1725
1726/**
1727 * ad_disable_collecting_distributing - disable a port's transmit/receive
1728 * @port: the port we're looking at
1da177e4
LT		 1729 */
1730static void ad_disable_collecting_distributing(struct port *port)
1731{
3bf2d28a
VF		 1732 if (port->aggregator &&
1733 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1734 &(null_mac_addr))) {
a4aee5c8
JP		 1735 pr_debug("Disabling port %d(LAG %d)\n",
1736 port->actor_port_number,
1737 port->aggregator->aggregator_identifier);
1da177e4
LT		 1738 __disable_port(port);
1739 }
1740}
1741
1da177e4
LT		 1742/**
1743 * ad_marker_info_received - handle receive of a Marker information frame
1744 * @marker_info: Marker info received
1745 * @port: the port we're looking at
1da177e4 1746 */
1c3f0b8e
MD		 1747static void ad_marker_info_received(struct bond_marker *marker_info,
1748 struct port *port)
1da177e4 1749{
1c3f0b8e 1750 struct bond_marker marker;
1da177e4 1751
3bf2d28a 1752 /* copy the received marker data to the response marker */
1c3f0b8e 1753 memcpy(&marker, marker_info, sizeof(struct bond_marker));
3bf2d28a 1754 /* change the marker subtype to marker response */
128ea6c3 1755 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1da177e4 1756
3bf2d28a 1757 /* send the marker response */
1da177e4 1758 if (ad_marker_send(port, &marker) >= 0) {
a4aee5c8
JP		 1759 pr_debug("Sent Marker Response on port %d\n",
1760 port->actor_port_number);
1da177e4
LT		 1761 }
1762}
1763
1764/**
1765 * ad_marker_response_received - handle receive of a marker response frame
1766 * @marker: marker PDU received
1767 * @port: the port we're looking at
1768 *
1769 * This function does nothing since we decided not to implement send and handle
1770 * response for marker PDU's, in this stage, but only to respond to marker
1771 * information.
1772 */
1c3f0b8e 1773static void ad_marker_response_received(struct bond_marker *marker,
3bf2d28a 1774 struct port *port)
1da177e4 1775{
3bf2d28a
VF		 1776 marker = NULL;
1777 port = NULL;
1778 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1da177e4
LT		 1779}
1780
3bf2d28a 1781/* ========= AD exported functions to the main bonding code ========= */
1da177e4 1782
3bf2d28a 1783/* Check aggregators status in team every T seconds */
1da177e4
LT		 1784#define AD_AGGREGATOR_SELECTION_TIMER 8
1785
3bf2d28a
VF		 1786/**
1787 * bond_3ad_initiate_agg_selection - initate aggregator selection
1788 * @bond: bonding struct
fd989c83
JV		 1789 *
1790 * Set the aggregation selection timer, to initiate an agg selection in
1791 * the very near future. Called during first initialization, and during
1792 * any down to up transitions of the bond.
1793 */
1794void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1795{
1796 BOND_AD_INFO(bond).agg_select_timer = timeout;
fd989c83
JV		 1797}
1798
1da177e4
LT		 1799static u16 aggregator_identifier;
1800
1801/**
1802 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1803 * @bond: bonding struct to work on
1804 * @tick_resolution: tick duration (millisecond resolution)
1da177e4
LT		 1805 *
1806 * Can be called only after the mac address of the bond is set.
1807 */
56d00c67 1808void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
3a6d54c5 1809{
815117ad 1810 /* check that the bond is not initialized yet */
1811 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
3a6d54c5 1812 bond->dev->dev_addr)) {
1da177e4
LT		 1813
1814 aggregator_identifier = 0;
1815
1da177e4
LT		 1816 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1817 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1818
3bf2d28a
VF		 1819 /* initialize how many times this module is called in one
1820 * second (should be about every 100ms)
1821 */
1da177e4
LT		 1822 ad_ticks_per_sec = tick_resolution;
1823
fd989c83
JV		 1824 bond_3ad_initiate_agg_selection(bond,
1825 AD_AGGREGATOR_SELECTION_TIMER *
1826 ad_ticks_per_sec);
1da177e4
LT		 1827 }
1828}
1829
1830/**
1831 * bond_3ad_bind_slave - initialize a slave's port
1832 * @slave: slave struct to work on
1833 *
1834 * Returns: 0 on success
1835 * < 0 on error
1836 */
359632e5 1837void bond_3ad_bind_slave(struct slave *slave)
1da177e4
LT		 1838{
1839 struct bonding *bond = bond_get_bond_by_slave(slave);
1840 struct port *port;
1841 struct aggregator *aggregator;
1842
359632e5 1843 /* check that the slave has not been initialized yet. */
1da177e4
LT		 1844 if (SLAVE_AD_INFO(slave).port.slave != slave) {
1845
359632e5 1846 /* port initialization */
1da177e4
LT		 1847 port = &(SLAVE_AD_INFO(slave).port);
1848
bf0239a9 1849 ad_initialize_port(port, bond->params.lacp_fast);
1da177e4 1850
e0809dbc 1851 __initialize_port_locks(slave);
1da177e4
LT		 1852 port->slave = slave;
1853 port->actor_port_number = SLAVE_AD_INFO(slave).id;
359632e5 1854 /* key is determined according to the link speed, duplex and user key(which
1855 * is yet not supported)
359632e5 1856 */
3bf2d28a 1857 port->actor_admin_port_key = 0;
1da177e4
LT		 1858 port->actor_admin_port_key |= __get_duplex(port);
1859 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1860 port->actor_oper_port_key = port->actor_admin_port_key;
3bf2d28a
VF		 1861 /* if the port is not full duplex, then the port should be not
1862 * lacp Enabled
1863 */
7bfc4753 1864 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1da177e4 1865 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
359632e5 1866 /* actor system is the bond's system */
1da177e4 1867 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
3bf2d28a
VF		 1868 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1869 * lacpdu's are sent in one second)
1870 */
1da177e4
LT		 1871 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1872 port->aggregator = NULL;
1873 port->next_port_in_aggregator = NULL;
1874
1875 __disable_port(port);
1da177e4 1876
359632e5 1877 /* aggregator initialization */
1da177e4
LT		 1878 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1879
1880 ad_initialize_agg(aggregator);
1881
1882 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1883 aggregator->aggregator_identifier = (++aggregator_identifier);
1884 aggregator->slave = slave;
1885 aggregator->is_active = 0;
1886 aggregator->num_of_ports = 0;
1887 }
1da177e4
LT		 1888}
1889
1890/**
1891 * bond_3ad_unbind_slave - deinitialize a slave's port
1892 * @slave: slave struct to work on
1893 *
1894 * Search for the aggregator that is related to this port, remove the
1895 * aggregator and assign another aggregator for other port related to it
1896 * (if any), and remove the port.
1897 */
1898void bond_3ad_unbind_slave(struct slave *slave)
1899{
1900 struct port *port, *prev_port, *temp_port;
1901 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1902 int select_new_active_agg = 0;
0b088264
VF		 1903 struct bonding *bond = slave->bond;
1904 struct slave *slave_iter;
1905 struct list_head *iter;
a361c83c 1906
1da177e4 1907 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1da177e4
LT		 1908 port = &(SLAVE_AD_INFO(slave).port);
1909
3bf2d28a 1910 /* if slave is null, the whole port is not initialized */
1da177e4 1911 if (!port->slave) {
ed3587fa
VF		 1912 pr_warn("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1913 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 1914 return;
1915 }
1916
a4aee5c8
JP		 1917 pr_debug("Unbinding Link Aggregation Group %d\n",
1918 aggregator->aggregator_identifier);
1da177e4
LT		 1919
1920 /* Tell the partner that this port is not suitable for aggregation */
1921 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1922 __update_lacpdu_from_port(port);
1923 ad_lacpdu_send(port);
1924
3bf2d28a 1925 /* check if this aggregator is occupied */
1da177e4 1926 if (aggregator->lag_ports) {
3bf2d28a
VF		 1927 /* check if there are other ports related to this aggregator
1928 * except the port related to this slave(thats ensure us that
1929 * there is a reason to search for new aggregator, and that we
1930 * will find one
1931 */
1932 if ((aggregator->lag_ports != port) ||
1933 (aggregator->lag_ports->next_port_in_aggregator)) {
1934 /* find new aggregator for the related port(s) */
0b088264
VF		 1935 bond_for_each_slave(bond, slave_iter, iter) {
1936 new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
3bf2d28a
VF		 1937 /* if the new aggregator is empty, or it is
1938 * connected to our port only
1939 */
1940 if (!new_aggregator->lag_ports ||
1941 ((new_aggregator->lag_ports == port) &&
1942 !new_aggregator->lag_ports->next_port_in_aggregator))
1da177e4 1943 break;
1da177e4 1944 }
0b088264
VF		 1945 if (!slave_iter)
1946 new_aggregator = NULL;
3bf2d28a
VF		 1947
1948 /* if new aggregator found, copy the aggregator's
1949 * parameters and connect the related lag_ports to the
1950 * new aggregator
1951 */
1da177e4 1952 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
a4aee5c8
JP		 1953 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
1954 aggregator->aggregator_identifier,
1955 new_aggregator->aggregator_identifier);
1da177e4 1956
3bf2d28a
VF		 1957 if ((new_aggregator->lag_ports == port) &&
1958 new_aggregator->is_active) {
a4aee5c8 1959 pr_info("%s: Removing an active aggregator\n",
471cb5a3 1960 aggregator->slave->bond->dev->name);
1da177e4
LT		 1961 select_new_active_agg = 1;
1962 }
1963
1964 new_aggregator->is_individual = aggregator->is_individual;
1965 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1966 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1967 new_aggregator->partner_system = aggregator->partner_system;
1968 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1969 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1970 new_aggregator->receive_state = aggregator->receive_state;
1971 new_aggregator->transmit_state = aggregator->transmit_state;
1972 new_aggregator->lag_ports = aggregator->lag_ports;
1973 new_aggregator->is_active = aggregator->is_active;
1974 new_aggregator->num_of_ports = aggregator->num_of_ports;
1975
3bf2d28a
VF		 1976 /* update the information that is written on
1977 * the ports about the aggregator
1978 */
128ea6c3
BD		 1979 for (temp_port = aggregator->lag_ports; temp_port;
1980 temp_port = temp_port->next_port_in_aggregator) {
1981 temp_port->aggregator = new_aggregator;
1da177e4
LT		 1982 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1983 }
1984
1da177e4 1985 ad_clear_agg(aggregator);
a361c83c 1986
7bfc4753 1987 if (select_new_active_agg)
1da177e4 1988 ad_agg_selection_logic(__get_first_agg(port));
1da177e4 1989 } else {
ed3587fa
VF		 1990 pr_warn("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
1991 slave->bond->dev->name);
1da177e4 1992 }
3bf2d28a
VF		 1993 } else {
1994 /* in case that the only port related to this
1995 * aggregator is the one we want to remove
1996 */
1da177e4 1997 select_new_active_agg = aggregator->is_active;
1da177e4
LT		 1998 ad_clear_agg(aggregator);
1999 if (select_new_active_agg) {
a4aee5c8 2000 pr_info("%s: Removing an active aggregator\n",
471cb5a3 2001 slave->bond->dev->name);
3bf2d28a 2002 /* select new active aggregator */
74684493
VF		 2003 temp_aggregator = __get_first_agg(port);
2004 if (temp_aggregator)
2005 ad_agg_selection_logic(temp_aggregator);
1da177e4
LT		 2006 }
2007 }
2008 }
2009
5a03cdb7 2010 pr_debug("Unbinding port %d\n", port->actor_port_number);
3bf2d28a
VF		 2011
2012 /* find the aggregator that this port is connected to */
0b088264
VF		 2013 bond_for_each_slave(bond, slave_iter, iter) {
2014 temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
1da177e4 2015 prev_port = NULL;
3bf2d28a 2016 /* search the port in the aggregator's related ports */
128ea6c3
BD		 2017 for (temp_port = temp_aggregator->lag_ports; temp_port;
2018 prev_port = temp_port,
3bf2d28a
VF		 2019 temp_port = temp_port->next_port_in_aggregator) {
2020 if (temp_port == port) {
2021 /* the aggregator found - detach the port from
2022 * this aggregator
2023 */
7bfc4753 2024 if (prev_port)
1da177e4 2025 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
7bfc4753 2026 else
1da177e4 2027 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
1da177e4 2028 temp_aggregator->num_of_ports--;
128ea6c3 2029 if (temp_aggregator->num_of_ports == 0) {
1da177e4 2030 select_new_active_agg = temp_aggregator->is_active;
1da177e4
LT		 2031 ad_clear_agg(temp_aggregator);
2032 if (select_new_active_agg) {
a4aee5c8 2033 pr_info("%s: Removing an active aggregator\n",
471cb5a3 2034 slave->bond->dev->name);
3bf2d28a 2035 /* select new active aggregator */
1da177e4
LT		 2036 ad_agg_selection_logic(__get_first_agg(port));
2037 }
2038 }
2039 break;
2040 }
2041 }
2042 }
128ea6c3 2043 port->slave = NULL;
1da177e4
LT		 2044}
2045
2046/**
2047 * bond_3ad_state_machine_handler - handle state machines timeout
2048 * @bond: bonding struct to work on
2049 *
2050 * The state machine handling concept in this module is to check every tick
2051 * which state machine should operate any function. The execution order is
2052 * round robin, so when we have an interaction between state machines, the
2053 * reply of one to each other might be delayed until next tick.
2054 *
2055 * This function also complete the initialization when the agg_select_timer
2056 * times out, and it selects an aggregator for the ports that are yet not
2057 * related to any aggregator, and selects the active aggregator for a bond.
2058 */
1b76b316 2059void bond_3ad_state_machine_handler(struct work_struct *work)
1da177e4 2060{
1b76b316
JV		 2061 struct bonding *bond = container_of(work, struct bonding,
2062 ad_work.work);
1da177e4 2063 struct aggregator *aggregator;
3c4c88a1
VF		 2064 struct list_head *iter;
2065 struct slave *slave;
2066 struct port *port;
1da177e4 2067
1f2cd845 2068 read_lock(&bond->lock);
be79bd04 2069 rcu_read_lock();
1f2cd845 2070
be79bd04 2071 /* check if there are any slaves */
0965a1f3 2072 if (!bond_has_slaves(bond))
1da177e4 2073 goto re_arm;
1da177e4 2074
be79bd04 2075 /* check if agg_select_timer timer after initialize is timed out */
3bf2d28a
VF		 2076 if (BOND_AD_INFO(bond).agg_select_timer &&
2077 !(--BOND_AD_INFO(bond).agg_select_timer)) {
be79bd04 2078 slave = bond_first_slave_rcu(bond);
fe9323da
VF		 2079 port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
2080
be79bd04 2081 /* select the active aggregator for the bond */
fe9323da 2082 if (port) {
1da177e4 2083 if (!port->slave) {
ed3587fa
VF		 2084 pr_warn("%s: Warning: bond's first port is uninitialized\n",
2085 bond->dev->name);
1da177e4
LT		 2086 goto re_arm;
2087 }
2088
2089 aggregator = __get_first_agg(port);
2090 ad_agg_selection_logic(aggregator);
2091 }
f0c76d61 2092 bond_3ad_set_carrier(bond);
1da177e4
LT		 2093 }
2094
be79bd04 2095 /* for each port run the state machines */
2096 bond_for_each_slave_rcu(bond, slave, iter) {
3c4c88a1 2097 port = &(SLAVE_AD_INFO(slave).port);
1da177e4 2098 if (!port->slave) {
ed3587fa
VF		 2099 pr_warn("%s: Warning: Found an uninitialized port\n",
2100 bond->dev->name);
1da177e4
LT		 2101 goto re_arm;
2102 }
2103
16d79d7d
NC		 2104 /* Lock around state machines to protect data accessed
2105 * by all (e.g., port->sm_vars). ad_rx_machine may run
2106 * concurrently due to incoming LACPDU.
2107 */
9ac3524a 2108 __get_state_machine_lock(port);
16d79d7d 2109
1da177e4
LT		 2110 ad_rx_machine(NULL, port);
2111 ad_periodic_machine(port);
2112 ad_port_selection_logic(port);
2113 ad_mux_machine(port);
2114 ad_tx_machine(port);
2115
be79bd04 2116 /* turn off the BEGIN bit, since we already handled it */
7bfc4753 2117 if (port->sm_vars & AD_PORT_BEGIN)
1da177e4 2118 port->sm_vars &= ~AD_PORT_BEGIN;
16d79d7d 2119
9ac3524a 2120 __release_state_machine_lock(port);
1da177e4
LT		 2121 }
2122
2123re_arm:
be79bd04 2124 rcu_read_unlock();
1f2cd845 2125 read_unlock(&bond->lock);
be79bd04 2126 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
1da177e4
LT		 2127}
2128
2129/**
2130 * bond_3ad_rx_indication - handle a received frame
2131 * @lacpdu: received lacpdu
2132 * @slave: slave struct to work on
2133 * @length: length of the data received
2134 *
2135 * It is assumed that frames that were sent on this NIC don't returned as new
2136 * received frames (loopback). Since only the payload is given to this
2137 * function, it check for loopback.
2138 */
3bf2d28a
VF		 2139static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2140 u16 length)
1da177e4
LT		 2141{
2142 struct port *port;
13a8e0c8 2143 int ret = RX_HANDLER_ANOTHER;
1da177e4
LT		 2144
2145 if (length >= sizeof(struct lacpdu)) {
2146
2147 port = &(SLAVE_AD_INFO(slave).port);
2148
2149 if (!port->slave) {
ed3587fa
VF		 2150 pr_warn("%s: Warning: port of slave %s is uninitialized\n",
2151 slave->dev->name, slave->bond->dev->name);
13a8e0c8 2152 return ret;
1da177e4
LT		 2153 }
2154
2155 switch (lacpdu->subtype) {
2156 case AD_TYPE_LACPDU:
13a8e0c8 2157 ret = RX_HANDLER_CONSUMED;
a4aee5c8
JP		 2158 pr_debug("Received LACPDU on port %d\n",
2159 port->actor_port_number);
16d79d7d 2160 /* Protect against concurrent state machines */
9ac3524a 2161 __get_state_machine_lock(port);
1da177e4 2162 ad_rx_machine(lacpdu, port);
9ac3524a 2163 __release_state_machine_lock(port);
1da177e4
LT		 2164 break;
2165
2166 case AD_TYPE_MARKER:
13a8e0c8 2167 ret = RX_HANDLER_CONSUMED;
3bf2d28a
VF		 2168 /* No need to convert fields to Little Endian since we
2169 * don't use the marker's fields.
2170 */
1da177e4 2171
1c3f0b8e 2172 switch (((struct bond_marker *)lacpdu)->tlv_type) {
1da177e4 2173 case AD_MARKER_INFORMATION_SUBTYPE:
a4aee5c8
JP		 2174 pr_debug("Received Marker Information on port %d\n",
2175 port->actor_port_number);
1c3f0b8e 2176 ad_marker_info_received((struct bond_marker *)lacpdu, port);
1da177e4
LT		 2177 break;
2178
2179 case AD_MARKER_RESPONSE_SUBTYPE:
a4aee5c8
JP		 2180 pr_debug("Received Marker Response on port %d\n",
2181 port->actor_port_number);
1c3f0b8e 2182 ad_marker_response_received((struct bond_marker *)lacpdu, port);
1da177e4
LT		 2183 break;
2184
2185 default:
a4aee5c8
JP		 2186 pr_debug("Received an unknown Marker subtype on slot %d\n",
2187 port->actor_port_number);
1da177e4
LT		 2188 }
2189 }
2190 }
13a8e0c8 2191 return ret;
1da177e4
LT		 2192}
2193
2194/**
2195 * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2196 * @slave: slave struct to work on
2197 *
2198 * Handle reselection of aggregator (if needed) for this port.
2199 */
2200void bond_3ad_adapter_speed_changed(struct slave *slave)
2201{
2202 struct port *port;
2203
2204 port = &(SLAVE_AD_INFO(slave).port);
2205
71a06c59 2206 /* if slave is null, the whole port is not initialized */
1da177e4 2207 if (!port->slave) {
ed3587fa
VF		 2208 pr_warn("Warning: %s: speed changed for uninitialized port on %s\n",
2209 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 2210 return;
2211 }
2212
71a06c59 2213 __get_state_machine_lock(port);
2214
1da177e4 2215 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
128ea6c3
BD		 2216 port->actor_oper_port_key = port->actor_admin_port_key |=
2217 (__get_link_speed(port) << 1);
5a03cdb7 2218 pr_debug("Port %d changed speed\n", port->actor_port_number);
71a06c59 2219 /* there is no need to reselect a new aggregator, just signal the
2220 * state machines to reinitialize
2221 */
1da177e4 2222 port->sm_vars |= AD_PORT_BEGIN;
71a06c59 2223
2224 __release_state_machine_lock(port);
1da177e4
LT		 2225}
2226
2227/**
2228 * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2229 * @slave: slave struct to work on
2230 *
2231 * Handle reselection of aggregator (if needed) for this port.
2232 */
2233void bond_3ad_adapter_duplex_changed(struct slave *slave)
2234{
2235 struct port *port;
2236
128ea6c3 2237 port = &(SLAVE_AD_INFO(slave).port);
1da177e4 2238
bca44a73 2239 /* if slave is null, the whole port is not initialized */
1da177e4 2240 if (!port->slave) {
ed3587fa
VF		 2241 pr_warn("%s: Warning: duplex changed for uninitialized port on %s\n",
2242 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 2243 return;
2244 }
2245
bca44a73 2246 __get_state_machine_lock(port);
2247
1da177e4 2248 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
128ea6c3
BD		 2249 port->actor_oper_port_key = port->actor_admin_port_key |=
2250 __get_duplex(port);
5a03cdb7 2251 pr_debug("Port %d changed duplex\n", port->actor_port_number);
bca44a73 2252 /* there is no need to reselect a new aggregator, just signal the
2253 * state machines to reinitialize
2254 */
1da177e4 2255 port->sm_vars |= AD_PORT_BEGIN;
bca44a73 2256
2257 __release_state_machine_lock(port);
1da177e4
LT		 2258}
2259
2260/**
2261 * bond_3ad_handle_link_change - handle a slave's link status change indication
2262 * @slave: slave struct to work on
2263 * @status: whether the link is now up or down
2264 *
2265 * Handle reselection of aggregator (if needed) for this port.
2266 */
2267void bond_3ad_handle_link_change(struct slave *slave, char link)
2268{
2269 struct port *port;
2270
2271 port = &(SLAVE_AD_INFO(slave).port);
2272
108db736 2273 /* if slave is null, the whole port is not initialized */
1da177e4 2274 if (!port->slave) {
ed3587fa
VF		 2275 pr_warn("Warning: %s: link status changed for uninitialized port on %s\n",
2276 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 2277 return;
2278 }
2279
108db736 2280 __get_state_machine_lock(port);
2281 /* on link down we are zeroing duplex and speed since
2282 * some of the adaptors(ce1000.lan) report full duplex/speed
2283 * instead of N/A(duplex) / 0(speed).
2284 *
2285 * on link up we are forcing recheck on the duplex and speed since
2286 * some of he adaptors(ce1000.lan) report.
2287 */
1da177e4 2288 if (link == BOND_LINK_UP) {
f48127b6 2289 port->is_enabled = true;
1da177e4 2290 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
128ea6c3
BD		 2291 port->actor_oper_port_key = port->actor_admin_port_key |=
2292 __get_duplex(port);
1da177e4 2293 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
128ea6c3
BD		 2294 port->actor_oper_port_key = port->actor_admin_port_key |=
2295 (__get_link_speed(port) << 1);
1da177e4
LT		 2296 } else {
2297 /* link has failed */
f48127b6 2298 port->is_enabled = false;
1da177e4 2299 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
128ea6c3
BD		 2300 port->actor_oper_port_key = (port->actor_admin_port_key &=
2301 ~AD_SPEED_KEY_BITS);
1da177e4 2302 }
108db736 2303 pr_debug("Port %d changed link status to %s",
2304 port->actor_port_number,
2305 (link == BOND_LINK_UP) ? "UP" : "DOWN");
2306 /* there is no need to reselect a new aggregator, just signal the
2307 * state machines to reinitialize
2308 */
1da177e4 2309 port->sm_vars |= AD_PORT_BEGIN;
108db736 2310
2311 __release_state_machine_lock(port);
1da177e4
LT		 2312}
2313
3bf2d28a
VF		 2314/**
2315 * bond_3ad_set_carrier - set link state for bonding master
2316 * @bond - bonding structure
2317 *
2318 * if we have an active aggregator, we're up, if not, we're down.
2319 * Presumes that we cannot have an active aggregator if there are
2320 * no slaves with link up.
ff59c456 2321 *
031ae4de
JV		 2322 * This behavior complies with IEEE 802.3 section 43.3.9.
2323 *
ff59c456
JV		 2324 * Called by bond_set_carrier(). Return zero if carrier state does not
2325 * change, nonzero if it does.
2326 */
2327int bond_3ad_set_carrier(struct bonding *bond)
2328{
655f8919 2329 struct aggregator *active;
dec1e90e 2330 struct slave *first_slave;
c1bc9644 2331 int ret = 1;
655f8919 2332
be79bd04 2333 rcu_read_lock();
2334 first_slave = bond_first_slave_rcu(bond);
c1bc9644
VF		 2335 if (!first_slave) {
2336 ret = 0;
2337 goto out;
2338 }
dec1e90e 2339 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
655f8919 2340 if (active) {
2341 /* are enough slaves available to consider link up? */
2342 if (active->num_of_ports < bond->params.min_links) {
2343 if (netif_carrier_ok(bond->dev)) {
2344 netif_carrier_off(bond->dev);
c1bc9644 2345 goto out;
655f8919 2346 }
2347 } else if (!netif_carrier_ok(bond->dev)) {
ff59c456 2348 netif_carrier_on(bond->dev);
c1bc9644 2349 goto out;
ff59c456 2350 }
c1bc9644 2351 } else if (netif_carrier_ok(bond->dev)) {
ff59c456 2352 netif_carrier_off(bond->dev);
ff59c456 2353 }
c1bc9644
VF		 2354out:
2355 rcu_read_unlock();
2356 return ret;
ff59c456
JV		 2357}
2358
1da177e4 2359/**
318debd8 2360 * __bond_3ad_get_active_agg_info - get information of the active aggregator
1da177e4
LT		 2361 * @bond: bonding struct to work on
2362 * @ad_info: ad_info struct to fill with the bond's info
2363 *
2364 * Returns: 0 on success
2365 * < 0 on error
2366 */
318debd8 2367int __bond_3ad_get_active_agg_info(struct bonding *bond,
2368 struct ad_info *ad_info)
1da177e4
LT		 2369{
2370 struct aggregator *aggregator = NULL;
3c4c88a1
VF		 2371 struct list_head *iter;
2372 struct slave *slave;
1da177e4
LT		 2373 struct port *port;
2374
47e91f56 2375 bond_for_each_slave_rcu(bond, slave, iter) {
3c4c88a1 2376 port = &(SLAVE_AD_INFO(slave).port);
1da177e4
LT		 2377 if (port->aggregator && port->aggregator->is_active) {
2378 aggregator = port->aggregator;
2379 break;
2380 }
2381 }
2382
2383 if (aggregator) {
2384 ad_info->aggregator_id = aggregator->aggregator_identifier;
2385 ad_info->ports = aggregator->num_of_ports;
2386 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2387 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
3bf2d28a
VF		 2388 memcpy(ad_info->partner_system,
2389 aggregator->partner_system.mac_addr_value, ETH_ALEN);
1da177e4
LT		 2390 return 0;
2391 }
2392
2393 return -1;
2394}
2395
318debd8 2396/* Wrapper used to hold bond->lock so no slave manipulation can occur */
2397int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2398{
2399 int ret;
2400
47e91f56 2401 rcu_read_lock();
318debd8 2402 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
47e91f56 2403 rcu_read_unlock();
318debd8 2404
2405 return ret;
2406}
2407
1da177e4
LT		 2408int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2409{
454d7c9b 2410 struct bonding *bond = netdev_priv(dev);
c33d7887
VF		 2411 struct slave *slave, *first_ok_slave;
2412 struct aggregator *agg;
2413 struct ad_info ad_info;
9caff1e7 2414 struct list_head *iter;
1da177e4 2415 int slaves_in_agg;
c33d7887 2416 int slave_agg_no;
c33d7887 2417 int agg_id;
1da177e4 2418
318debd8 2419 if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2420 pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
a4aee5c8 2421 dev->name);
a742e1f5 2422 goto err_free;
1da177e4
LT		 2423 }
2424
2425 slaves_in_agg = ad_info.ports;
2426 agg_id = ad_info.aggregator_id;
2427
2428 if (slaves_in_agg == 0) {
a4aee5c8 2429 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
a742e1f5 2430 goto err_free;
1da177e4
LT		 2431 }
2432
32819dc1 2433 slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
c33d7887 2434 first_ok_slave = NULL;
1da177e4 2435
47e91f56 2436 bond_for_each_slave_rcu(bond, slave, iter) {
c33d7887
VF		 2437 agg = SLAVE_AD_INFO(slave).port.aggregator;
2438 if (!agg || agg->aggregator_identifier != agg_id)
2439 continue;
1da177e4 2440
c33d7887
VF		 2441 if (slave_agg_no >= 0) {
2442 if (!first_ok_slave && SLAVE_IS_OK(slave))
2443 first_ok_slave = slave;
1da177e4 2444 slave_agg_no--;
c33d7887
VF		 2445 continue;
2446 }
2447
2448 if (SLAVE_IS_OK(slave)) {
a742e1f5 2449 bond_dev_queue_xmit(bond, skb, slave->dev);
c33d7887 2450 goto out;
1da177e4
LT		 2451 }
2452 }
2453
2454 if (slave_agg_no >= 0) {
a4aee5c8
JP		 2455 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2456 dev->name, agg_id);
a742e1f5 2457 goto err_free;
1da177e4
LT		 2458 }
2459
c33d7887 2460 /* we couldn't find any suitable slave after the agg_no, so use the
3bf2d28a
VF		 2461 * first suitable found, if found.
2462 */
c33d7887 2463 if (first_ok_slave)
a742e1f5 2464 bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2465 else
2466 goto err_free;
1da177e4
LT		 2467
2468out:
ec634fe3 2469 return NETDEV_TX_OK;
a742e1f5 2470err_free:
2471 /* no suitable interface, frame not sent */
2472 kfree_skb(skb);
2473 goto out;
1da177e4
LT		 2474}
2475
de063b70
ED		 2476int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2477 struct slave *slave)
1da177e4 2478{
13a8e0c8 2479 int ret = RX_HANDLER_ANOTHER;
de063b70
ED		 2480 struct lacpdu *lacpdu, _lacpdu;
2481
3aba891d 2482 if (skb->protocol != PKT_TYPE_LACPDU)
13a8e0c8 2483 return ret;
b3053251 2484
de063b70
ED		 2485 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2486 if (!lacpdu)
13a8e0c8 2487 return ret;
ab12811c 2488
1da177e4 2489 read_lock(&bond->lock);
de063b70 2490 ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
1da177e4 2491 read_unlock(&bond->lock);
13a8e0c8 2492 return ret;
1da177e4 2493}
ba824a8b 2494
3bf2d28a
VF		 2495/**
2496 * bond_3ad_update_lacp_rate - change the lacp rate
2497 * @bond - bonding struct
2498 *
ba824a8b
PP		 2499 * When modify lacp_rate parameter via sysfs,
2500 * update actor_oper_port_state of each port.
2501 *
2502 * Hold slave->state_machine_lock,
2503 * so we can modify port->actor_oper_port_state,
2504 * no matter bond is up or down.
2505 */
2506void bond_3ad_update_lacp_rate(struct bonding *bond)
2507{
ba824a8b 2508 struct port *port = NULL;
9caff1e7 2509 struct list_head *iter;
c509316b 2510 struct slave *slave;
ba824a8b
PP		 2511 int lacp_fast;
2512
ba824a8b 2513 lacp_fast = bond->params.lacp_fast;
9caff1e7 2514 bond_for_each_slave(bond, slave, iter) {
ba824a8b
PP		 2515 port = &(SLAVE_AD_INFO(slave).port);
2516 __get_state_machine_lock(port);
2517 if (lacp_fast)
2518 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2519 else
2520 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2521 __release_state_machine_lock(port);
2522 }
ba824a8b 2523}
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