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bonding: fix __get_first_agg RCU usage
[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
1da177e4
LT		 681 */
682static struct aggregator *__get_active_agg(struct aggregator *aggregator)
683{
19177e7d
VF		 684 struct bonding *bond = aggregator->slave->bond;
685 struct list_head *iter;
686 struct slave *slave;
1da177e4 687
be79bd04 688 rcu_read_lock();
689 bond_for_each_slave_rcu(bond, slave, iter)
690 if (SLAVE_AD_INFO(slave).aggregator.is_active) {
691 rcu_read_unlock();
19177e7d 692 return &(SLAVE_AD_INFO(slave).aggregator);
be79bd04 693 }
694 rcu_read_unlock();
1da177e4 695
19177e7d 696 return NULL;
1da177e4
LT		 697}
698
699/**
700 * __update_lacpdu_from_port - update a port's lacpdu fields
701 * @port: the port we're looking at
1da177e4
LT		 702 */
703static inline void __update_lacpdu_from_port(struct port *port)
704{
705 struct lacpdu *lacpdu = &port->lacpdu;
3b5b35d0 706 const struct port_params *partner = &port->partner_oper;
1da177e4 707
3bf2d28a
VF		 708 /* update current actual Actor parameters
709 * lacpdu->subtype initialized
1da177e4
LT		 710 * lacpdu->version_number initialized
711 * lacpdu->tlv_type_actor_info initialized
712 * lacpdu->actor_information_length initialized
713 */
714
d3bb52b0 715 lacpdu->actor_system_priority = htons(port->actor_system_priority);
1da177e4 716 lacpdu->actor_system = port->actor_system;
d3bb52b0
AV		 717 lacpdu->actor_key = htons(port->actor_oper_port_key);
718 lacpdu->actor_port_priority = htons(port->actor_port_priority);
719 lacpdu->actor_port = htons(port->actor_port_number);
1da177e4
LT		 720 lacpdu->actor_state = port->actor_oper_port_state;
721
722 /* lacpdu->reserved_3_1 initialized
723 * lacpdu->tlv_type_partner_info initialized
724 * lacpdu->partner_information_length initialized
725 */
726
3b5b35d0
HE		 727 lacpdu->partner_system_priority = htons(partner->system_priority);
728 lacpdu->partner_system = partner->system;
729 lacpdu->partner_key = htons(partner->key);
730 lacpdu->partner_port_priority = htons(partner->port_priority);
731 lacpdu->partner_port = htons(partner->port_number);
732 lacpdu->partner_state = partner->port_state;
1da177e4
LT		 733
734 /* lacpdu->reserved_3_2 initialized
735 * lacpdu->tlv_type_collector_info initialized
736 * lacpdu->collector_information_length initialized
737 * collector_max_delay initialized
738 * reserved_12[12] initialized
739 * tlv_type_terminator initialized
740 * terminator_length initialized
741 * reserved_50[50] initialized
742 */
1da177e4
LT		 743}
744
3bf2d28a 745/* ================= main 802.3ad protocol code ========================= */
1da177e4
LT		 746
747/**
748 * ad_lacpdu_send - send out a lacpdu packet on a given port
749 * @port: the port we're looking at
750 *
751 * Returns: 0 on success
752 * < 0 on error
753 */
754static int ad_lacpdu_send(struct port *port)
755{
756 struct slave *slave = port->slave;
757 struct sk_buff *skb;
758 struct lacpdu_header *lacpdu_header;
759 int length = sizeof(struct lacpdu_header);
1da177e4
LT		 760
761 skb = dev_alloc_skb(length);
7bfc4753 762 if (!skb)
1da177e4 763 return -ENOMEM;
1da177e4
LT		 764
765 skb->dev = slave->dev;
459a98ed 766 skb_reset_mac_header(skb);
b0e380b1 767 skb->network_header = skb->mac_header + ETH_HLEN;
1da177e4
LT		 768 skb->protocol = PKT_TYPE_LACPDU;
769 skb->priority = TC_PRIO_CONTROL;
770
771 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
772
e727149e 773 memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
b595076a 774 /* Note: source address is set to be the member's PERMANENT address,
3bf2d28a
VF		 775 * because we use it to identify loopback lacpdus in receive.
776 */
e727149e
HE		 777 memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
778 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
1da177e4 779
3bf2d28a 780 lacpdu_header->lacpdu = port->lacpdu;
1da177e4
LT		 781
782 dev_queue_xmit(skb);
783
784 return 0;
785}
786
787/**
788 * ad_marker_send - send marker information/response on a given port
789 * @port: the port we're looking at
790 * @marker: marker data to send
791 *
792 * Returns: 0 on success
793 * < 0 on error
794 */
1c3f0b8e 795static int ad_marker_send(struct port *port, struct bond_marker *marker)
1da177e4
LT		 796{
797 struct slave *slave = port->slave;
798 struct sk_buff *skb;
1c3f0b8e
MD		 799 struct bond_marker_header *marker_header;
800 int length = sizeof(struct bond_marker_header);
1da177e4
LT		 801
802 skb = dev_alloc_skb(length + 16);
7bfc4753 803 if (!skb)
1da177e4 804 return -ENOMEM;
1da177e4
LT		 805
806 skb_reserve(skb, 16);
807
808 skb->dev = slave->dev;
459a98ed 809 skb_reset_mac_header(skb);
b0e380b1 810 skb->network_header = skb->mac_header + ETH_HLEN;
1da177e4
LT		 811 skb->protocol = PKT_TYPE_LACPDU;
812
1c3f0b8e 813 marker_header = (struct bond_marker_header *)skb_put(skb, length);
1da177e4 814
e727149e 815 memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
b595076a 816 /* Note: source address is set to be the member's PERMANENT address,
3bf2d28a
VF		 817 * because we use it to identify loopback MARKERs in receive.
818 */
e727149e
HE		 819 memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
820 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
1da177e4 821
3bf2d28a 822 marker_header->marker = *marker;
1da177e4
LT		 823
824 dev_queue_xmit(skb);
825
826 return 0;
827}
828
829/**
830 * ad_mux_machine - handle a port's mux state machine
831 * @port: the port we're looking at
1da177e4
LT		 832 */
833static void ad_mux_machine(struct port *port)
834{
835 mux_states_t last_state;
836
3bf2d28a
VF		 837 /* keep current State Machine state to compare later if it was
838 * changed
839 */
1da177e4
LT		 840 last_state = port->sm_mux_state;
841
842 if (port->sm_vars & AD_PORT_BEGIN) {
3bf2d28a 843 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 844 } else {
845 switch (port->sm_mux_state) {
846 case AD_MUX_DETACHED:
7bfc4753
BD		 847 if ((port->sm_vars & AD_PORT_SELECTED)
848 || (port->sm_vars & AD_PORT_STANDBY))
849 /* if SELECTED or STANDBY */
3bf2d28a 850 port->sm_mux_state = AD_MUX_WAITING;
1da177e4
LT		 851 break;
852 case AD_MUX_WAITING:
3bf2d28a
VF		 853 /* if SELECTED == FALSE return to DETACH state */
854 if (!(port->sm_vars & AD_PORT_SELECTED)) {
1da177e4 855 port->sm_vars &= ~AD_PORT_READY_N;
3bf2d28a
VF		 856 /* in order to withhold the Selection Logic to
857 * check all ports READY_N value every callback
858 * cycle to update ready variable, we check
859 * READY_N and update READY here
860 */
1da177e4 861 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
3bf2d28a 862 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 863 break;
864 }
865
3bf2d28a 866 /* check if the wait_while_timer expired */
7bfc4753
BD		 867 if (port->sm_mux_timer_counter
868 && !(--port->sm_mux_timer_counter))
1da177e4 869 port->sm_vars |= AD_PORT_READY_N;
1da177e4 870
3bf2d28a
VF		 871 /* in order to withhold the selection logic to check
872 * all ports READY_N value every callback cycle to
873 * update ready variable, we check READY_N and update
874 * READY here
875 */
1da177e4
LT		 876 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
877
3bf2d28a
VF		 878 /* if the wait_while_timer expired, and the port is
879 * in READY state, move to ATTACHED state
880 */
7bfc4753
BD		 881 if ((port->sm_vars & AD_PORT_READY)
882 && !port->sm_mux_timer_counter)
3bf2d28a 883 port->sm_mux_state = AD_MUX_ATTACHED;
1da177e4
LT		 884 break;
885 case AD_MUX_ATTACHED:
3bf2d28a
VF		 886 /* check also if agg_select_timer expired (so the
887 * edable port will take place only after this timer)
888 */
889 if ((port->sm_vars & AD_PORT_SELECTED) &&
890 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
891 !__check_agg_selection_timer(port)) {
892 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;
893 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
894 (port->sm_vars & AD_PORT_STANDBY)) {
895 /* if UNSELECTED or STANDBY */
1da177e4 896 port->sm_vars &= ~AD_PORT_READY_N;
3bf2d28a
VF		 897 /* in order to withhold the selection logic to
898 * check all ports READY_N value every callback
899 * cycle to update ready variable, we check
900 * READY_N and update READY here
901 */
1da177e4 902 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
3bf2d28a 903 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 904 }
905 break;
906 case AD_MUX_COLLECTING_DISTRIBUTING:
3bf2d28a
VF		 907 if (!(port->sm_vars & AD_PORT_SELECTED) ||
908 (port->sm_vars & AD_PORT_STANDBY) ||
909 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)) {
910 port->sm_mux_state = AD_MUX_ATTACHED;
1da177e4 911 } else {
3bf2d28a
VF		 912 /* if port state hasn't changed make
913 * sure that a collecting distributing
914 * port in an active aggregator is enabled
915 */
1da177e4
LT		 916 if (port->aggregator &&
917 port->aggregator->is_active &&
918 !__port_is_enabled(port)) {
919
920 __enable_port(port);
921 }
922 }
923 break;
3bf2d28a 924 default:
1da177e4
LT		 925 break;
926 }
927 }
928
3bf2d28a 929 /* check if the state machine was changed */
1da177e4 930 if (port->sm_mux_state != last_state) {
a4aee5c8
JP		 931 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
932 port->actor_port_number, last_state,
933 port->sm_mux_state);
1da177e4
LT		 934 switch (port->sm_mux_state) {
935 case AD_MUX_DETACHED:
1da177e4
LT		 936 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
937 ad_disable_collecting_distributing(port);
938 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
939 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
d238d458 940 port->ntt = true;
1da177e4
LT		 941 break;
942 case AD_MUX_WAITING:
943 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
944 break;
945 case AD_MUX_ATTACHED:
1da177e4
LT		 946 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
947 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
948 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
949 ad_disable_collecting_distributing(port);
d238d458 950 port->ntt = true;
1da177e4
LT		 951 break;
952 case AD_MUX_COLLECTING_DISTRIBUTING:
953 port->actor_oper_port_state |= AD_STATE_COLLECTING;
954 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
955 ad_enable_collecting_distributing(port);
d238d458 956 port->ntt = true;
1da177e4 957 break;
3bf2d28a 958 default:
1da177e4
LT		 959 break;
960 }
961 }
962}
963
964/**
965 * ad_rx_machine - handle a port's rx State Machine
966 * @lacpdu: the lacpdu we've received
967 * @port: the port we're looking at
968 *
969 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
970 * CURRENT. If timer expired set the state machine in the proper state.
971 * In other cases, this function checks if we need to switch to other state.
972 */
973static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
974{
975 rx_states_t last_state;
976
3bf2d28a
VF		 977 /* keep current State Machine state to compare later if it was
978 * changed
979 */
1da177e4
LT		 980 last_state = port->sm_rx_state;
981
3bf2d28a
VF		 982 /* check if state machine should change state */
983
984 /* first, check if port was reinitialized */
7bfc4753 985 if (port->sm_vars & AD_PORT_BEGIN)
7bfc4753 986 port->sm_rx_state = AD_RX_INITIALIZE;
3bf2d28a 987 /* check if port is not enabled */
7bfc4753
BD		 988 else if (!(port->sm_vars & AD_PORT_BEGIN)
989 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
7bfc4753 990 port->sm_rx_state = AD_RX_PORT_DISABLED;
3bf2d28a
VF		 991 /* check if new lacpdu arrived */
992 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
993 (port->sm_rx_state == AD_RX_DEFAULTED) ||
994 (port->sm_rx_state == AD_RX_CURRENT))) {
995 port->sm_rx_timer_counter = 0;
1da177e4
LT		 996 port->sm_rx_state = AD_RX_CURRENT;
997 } else {
3bf2d28a
VF		 998 /* if timer is on, and if it is expired */
999 if (port->sm_rx_timer_counter &&
1000 !(--port->sm_rx_timer_counter)) {
1da177e4
LT		 1001 switch (port->sm_rx_state) {
1002 case AD_RX_EXPIRED:
3bf2d28a 1003 port->sm_rx_state = AD_RX_DEFAULTED;
1da177e4
LT		 1004 break;
1005 case AD_RX_CURRENT:
3bf2d28a 1006 port->sm_rx_state = AD_RX_EXPIRED;
1da177e4 1007 break;
3bf2d28a 1008 default:
1da177e4
LT		 1009 break;
1010 }
1011 } else {
3bf2d28a 1012 /* if no lacpdu arrived and no timer is on */
1da177e4
LT		 1013 switch (port->sm_rx_state) {
1014 case AD_RX_PORT_DISABLED:
7bfc4753 1015 if (port->sm_vars & AD_PORT_MOVED)
3bf2d28a 1016 port->sm_rx_state = AD_RX_INITIALIZE;
7bfc4753
BD		 1017 else if (port->is_enabled
1018 && (port->sm_vars
1019 & AD_PORT_LACP_ENABLED))
3bf2d28a 1020 port->sm_rx_state = AD_RX_EXPIRED;
7bfc4753
BD		 1021 else if (port->is_enabled
1022 && ((port->sm_vars
1023 & AD_PORT_LACP_ENABLED) == 0))
3bf2d28a 1024 port->sm_rx_state = AD_RX_LACP_DISABLED;
1da177e4 1025 break;
3bf2d28a 1026 default:
1da177e4
LT		 1027 break;
1028
1029 }
1030 }
1031 }
1032
3bf2d28a 1033 /* check if the State machine was changed or new lacpdu arrived */
1da177e4 1034 if ((port->sm_rx_state != last_state) || (lacpdu)) {
a4aee5c8
JP		 1035 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1036 port->actor_port_number, last_state,
1037 port->sm_rx_state);
1da177e4
LT		 1038 switch (port->sm_rx_state) {
1039 case AD_RX_INITIALIZE:
7bfc4753 1040 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1da177e4 1041 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
7bfc4753 1042 else
1da177e4 1043 port->sm_vars |= AD_PORT_LACP_ENABLED;
1da177e4
LT		 1044 port->sm_vars &= ~AD_PORT_SELECTED;
1045 __record_default(port);
1046 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1047 port->sm_vars &= ~AD_PORT_MOVED;
3bf2d28a 1048 port->sm_rx_state = AD_RX_PORT_DISABLED;
1da177e4 1049
3bf2d28a 1050 /* Fall Through */
1da177e4
LT		 1051 case AD_RX_PORT_DISABLED:
1052 port->sm_vars &= ~AD_PORT_MATCHED;
1053 break;
1054 case AD_RX_LACP_DISABLED:
1055 port->sm_vars &= ~AD_PORT_SELECTED;
1056 __record_default(port);
1055c9ab 1057 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1da177e4
LT		 1058 port->sm_vars |= AD_PORT_MATCHED;
1059 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1060 break;
1061 case AD_RX_EXPIRED:
3bf2d28a
VF		 1062 /* Reset of the Synchronization flag (Standard 43.4.12)
1063 * This reset cause to disable this port in the
1064 * COLLECTING_DISTRIBUTING state of the mux machine in
1065 * case of EXPIRED even if LINK_DOWN didn't arrive for
1066 * the port.
1067 */
1055c9ab 1068 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1da177e4 1069 port->sm_vars &= ~AD_PORT_MATCHED;
3bf2d28a 1070 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1da177e4
LT		 1071 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1072 port->actor_oper_port_state |= AD_STATE_EXPIRED;
1073 break;
1074 case AD_RX_DEFAULTED:
1075 __update_default_selected(port);
1076 __record_default(port);
1077 port->sm_vars |= AD_PORT_MATCHED;
1078 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1079 break;
1080 case AD_RX_CURRENT:
815117ad 1081 /* detect loopback situation */
3bf2d28a
VF		 1082 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1083 &(port->actor_system))) {
1084 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",
1085 port->slave->bond->dev->name,
1086 port->slave->dev->name);
1da177e4
LT		 1087 return;
1088 }
1089 __update_selected(lacpdu, port);
1090 __update_ntt(lacpdu, port);
1091 __record_pdu(lacpdu, port);
1da177e4
LT		 1092 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1093 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1da177e4 1094 break;
3bf2d28a 1095 default:
1da177e4
LT		 1096 break;
1097 }
1098 }
1da177e4
LT		 1099}
1100
1101/**
1102 * ad_tx_machine - handle a port's tx state machine
1103 * @port: the port we're looking at
1da177e4
LT		 1104 */
1105static void ad_tx_machine(struct port *port)
1106{
3bf2d28a
VF		 1107 /* check if tx timer expired, to verify that we do not send more than
1108 * 3 packets per second
1109 */
1da177e4 1110 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
3bf2d28a 1111 /* check if there is something to send */
1da177e4
LT		 1112 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1113 __update_lacpdu_from_port(port);
d238d458 1114
1da177e4 1115 if (ad_lacpdu_send(port) >= 0) {
a4aee5c8
JP		 1116 pr_debug("Sent LACPDU on port %d\n",
1117 port->actor_port_number);
d238d458 1118
3bf2d28a
VF		 1119 /* mark ntt as false, so it will not be sent
1120 * again until demanded
1121 */
d238d458 1122 port->ntt = false;
1da177e4
LT		 1123 }
1124 }
3bf2d28a
VF		 1125 /* restart tx timer(to verify that we will not exceed
1126 * AD_MAX_TX_IN_SECOND
1127 */
1128 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1da177e4
LT		 1129 }
1130}
1131
1132/**
1133 * ad_periodic_machine - handle a port's periodic state machine
1134 * @port: the port we're looking at
1135 *
1136 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1137 */
1138static void ad_periodic_machine(struct port *port)
1139{
1140 periodic_states_t last_state;
1141
3bf2d28a 1142 /* keep current state machine state to compare later if it was changed */
1da177e4
LT		 1143 last_state = port->sm_periodic_state;
1144
3bf2d28a 1145 /* check if port was reinitialized */
1da177e4 1146 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1055c9ab 1147 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1da177e4 1148 ) {
3bf2d28a 1149 port->sm_periodic_state = AD_NO_PERIODIC;
1da177e4 1150 }
3bf2d28a 1151 /* check if state machine should change state */
1da177e4 1152 else if (port->sm_periodic_timer_counter) {
3bf2d28a 1153 /* check if periodic state machine expired */
1da177e4 1154 if (!(--port->sm_periodic_timer_counter)) {
3bf2d28a
VF		 1155 /* if expired then do tx */
1156 port->sm_periodic_state = AD_PERIODIC_TX;
1da177e4 1157 } else {
3bf2d28a
VF		 1158 /* If not expired, check if there is some new timeout
1159 * parameter from the partner state
1160 */
1da177e4
LT		 1161 switch (port->sm_periodic_state) {
1162 case AD_FAST_PERIODIC:
7bfc4753
BD		 1163 if (!(port->partner_oper.port_state
1164 & AD_STATE_LACP_TIMEOUT))
3bf2d28a 1165 port->sm_periodic_state = AD_SLOW_PERIODIC;
1da177e4
LT		 1166 break;
1167 case AD_SLOW_PERIODIC:
1055c9ab 1168 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1da177e4 1169 port->sm_periodic_timer_counter = 0;
3bf2d28a 1170 port->sm_periodic_state = AD_PERIODIC_TX;
1da177e4
LT		 1171 }
1172 break;
3bf2d28a 1173 default:
1da177e4
LT		 1174 break;
1175 }
1176 }
1177 } else {
1178 switch (port->sm_periodic_state) {
1179 case AD_NO_PERIODIC:
3bf2d28a 1180 port->sm_periodic_state = AD_FAST_PERIODIC;
1da177e4
LT		 1181 break;
1182 case AD_PERIODIC_TX:
3bf2d28a
VF		 1183 if (!(port->partner_oper.port_state &
1184 AD_STATE_LACP_TIMEOUT))
1185 port->sm_periodic_state = AD_SLOW_PERIODIC;
7bfc4753 1186 else
3bf2d28a 1187 port->sm_periodic_state = AD_FAST_PERIODIC;
1da177e4 1188 break;
3bf2d28a 1189 default:
1da177e4
LT		 1190 break;
1191 }
1192 }
1193
3bf2d28a 1194 /* check if the state machine was changed */
1da177e4 1195 if (port->sm_periodic_state != last_state) {
a4aee5c8
JP		 1196 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1197 port->actor_port_number, last_state,
1198 port->sm_periodic_state);
1da177e4
LT		 1199 switch (port->sm_periodic_state) {
1200 case AD_NO_PERIODIC:
3bf2d28a 1201 port->sm_periodic_timer_counter = 0;
1da177e4
LT		 1202 break;
1203 case AD_FAST_PERIODIC:
3bf2d28a
VF		 1204 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1205 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1da177e4
LT		 1206 break;
1207 case AD_SLOW_PERIODIC:
3bf2d28a
VF		 1208 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1209 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1da177e4
LT		 1210 break;
1211 case AD_PERIODIC_TX:
d238d458 1212 port->ntt = true;
1da177e4 1213 break;
3bf2d28a 1214 default:
1da177e4
LT		 1215 break;
1216 }
1217 }
1218}
1219
1220/**
1221 * ad_port_selection_logic - select aggregation groups
1222 * @port: the port we're looking at
1223 *
1224 * Select aggregation groups, and assign each port for it's aggregetor. The
1225 * selection logic is called in the inititalization (after all the handshkes),
1226 * and after every lacpdu receive (if selected is off).
1227 */
1228static void ad_port_selection_logic(struct port *port)
1229{
1230 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1231 struct port *last_port = NULL, *curr_port;
3e36bb75
VF		 1232 struct list_head *iter;
1233 struct bonding *bond;
1234 struct slave *slave;
1da177e4
LT		 1235 int found = 0;
1236
3bf2d28a 1237 /* if the port is already Selected, do nothing */
7bfc4753 1238 if (port->sm_vars & AD_PORT_SELECTED)
1da177e4 1239 return;
1da177e4 1240
3e36bb75
VF		 1241 bond = __get_bond_by_port(port);
1242
3bf2d28a 1243 /* if the port is connected to other aggregator, detach it */
1da177e4 1244 if (port->aggregator) {
3bf2d28a 1245 /* detach the port from its former aggregator */
128ea6c3
BD		 1246 temp_aggregator = port->aggregator;
1247 for (curr_port = temp_aggregator->lag_ports; curr_port;
1248 last_port = curr_port,
3bf2d28a 1249 curr_port = curr_port->next_port_in_aggregator) {
1da177e4
LT		 1250 if (curr_port == port) {
1251 temp_aggregator->num_of_ports--;
3bf2d28a
VF		 1252 /* if it is the first port attached to the
1253 * aggregator
1254 */
1255 if (!last_port) {
128ea6c3
BD		 1256 temp_aggregator->lag_ports =
1257 port->next_port_in_aggregator;
3bf2d28a
VF		 1258 } else {
1259 /* not the first port attached to the
1260 * aggregator
1261 */
128ea6c3
BD		 1262 last_port->next_port_in_aggregator =
1263 port->next_port_in_aggregator;
1da177e4
LT		 1264 }
1265
3bf2d28a
VF		 1266 /* clear the port's relations to this
1267 * aggregator
1268 */
1da177e4 1269 port->aggregator = NULL;
128ea6c3
BD		 1270 port->next_port_in_aggregator = NULL;
1271 port->actor_port_aggregator_identifier = 0;
1da177e4 1272
a4aee5c8
JP		 1273 pr_debug("Port %d left LAG %d\n",
1274 port->actor_port_number,
1275 temp_aggregator->aggregator_identifier);
3bf2d28a
VF		 1276 /* if the aggregator is empty, clear its
1277 * parameters, and set it ready to be attached
1278 */
7bfc4753 1279 if (!temp_aggregator->lag_ports)
1da177e4 1280 ad_clear_agg(temp_aggregator);
1da177e4
LT		 1281 break;
1282 }
1283 }
3bf2d28a
VF		 1284 if (!curr_port) {
1285 /* meaning: the port was related to an aggregator
1286 * but was not on the aggregator port list
1287 */
ed3587fa
VF		 1288 pr_warn("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1289 port->slave->bond->dev->name,
1290 port->actor_port_number,
1291 port->slave->dev->name,
1292 port->aggregator->aggregator_identifier);
1da177e4
LT		 1293 }
1294 }
3bf2d28a 1295 /* search on all aggregators for a suitable aggregator for this port */
3e36bb75
VF		 1296 bond_for_each_slave(bond, slave, iter) {
1297 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1da177e4 1298
3bf2d28a 1299 /* keep a free aggregator for later use(if needed) */
1da177e4 1300 if (!aggregator->lag_ports) {
7bfc4753 1301 if (!free_aggregator)
128ea6c3 1302 free_aggregator = aggregator;
1da177e4
LT		 1303 continue;
1304 }
815117ad 1305 /* check if current aggregator suits us */
1306 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1307 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1055c9ab
HE		 1308 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1309 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1da177e4 1310 ) &&
815117ad 1311 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1312 !aggregator->is_individual) /* but is not individual OR */
1da177e4
LT		 1313 )
1314 ) {
815117ad 1315 /* attach to the founded aggregator */
1da177e4 1316 port->aggregator = aggregator;
128ea6c3
BD		 1317 port->actor_port_aggregator_identifier =
1318 port->aggregator->aggregator_identifier;
1319 port->next_port_in_aggregator = aggregator->lag_ports;
1da177e4 1320 port->aggregator->num_of_ports++;
128ea6c3 1321 aggregator->lag_ports = port;
a4aee5c8
JP		 1322 pr_debug("Port %d joined LAG %d(existing LAG)\n",
1323 port->actor_port_number,
1324 port->aggregator->aggregator_identifier);
1da177e4 1325
3bf2d28a 1326 /* mark this port as selected */
1da177e4
LT		 1327 port->sm_vars |= AD_PORT_SELECTED;
1328 found = 1;
1329 break;
1330 }
1331 }
1332
3bf2d28a
VF		 1333 /* the port couldn't find an aggregator - attach it to a new
1334 * aggregator
1335 */
1da177e4
LT		 1336 if (!found) {
1337 if (free_aggregator) {
3bf2d28a 1338 /* assign port a new aggregator */
1da177e4 1339 port->aggregator = free_aggregator;
128ea6c3
BD		 1340 port->actor_port_aggregator_identifier =
1341 port->aggregator->aggregator_identifier;
1da177e4 1342
3bf2d28a
VF		 1343 /* update the new aggregator's parameters
1344 * if port was responsed from the end-user
1345 */
7bfc4753
BD		 1346 if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1347 /* if port is full duplex */
1624db7b 1348 port->aggregator->is_individual = false;
7bfc4753 1349 else
1624db7b 1350 port->aggregator->is_individual = true;
1da177e4
LT		 1351
1352 port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1353 port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
128ea6c3
BD		 1354 port->aggregator->partner_system =
1355 port->partner_oper.system;
1356 port->aggregator->partner_system_priority =
1357 port->partner_oper.system_priority;
1055c9ab 1358 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1da177e4
LT		 1359 port->aggregator->receive_state = 1;
1360 port->aggregator->transmit_state = 1;
1361 port->aggregator->lag_ports = port;
1362 port->aggregator->num_of_ports++;
1363
3bf2d28a 1364 /* mark this port as selected */
1da177e4
LT		 1365 port->sm_vars |= AD_PORT_SELECTED;
1366
a4aee5c8
JP		 1367 pr_debug("Port %d joined LAG %d(new LAG)\n",
1368 port->actor_port_number,
1369 port->aggregator->aggregator_identifier);
1da177e4 1370 } else {
a4aee5c8 1371 pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
471cb5a3 1372 port->slave->bond->dev->name,
1da177e4
LT		 1373 port->actor_port_number, port->slave->dev->name);
1374 }
1375 }
3bf2d28a
VF		 1376 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1377 * in all aggregator's ports, else set ready=FALSE in all
1378 * aggregator's ports
1379 */
1380 __set_agg_ports_ready(port->aggregator,
1381 __agg_ports_are_ready(port->aggregator));
1da177e4 1382
fd989c83
JV		 1383 aggregator = __get_first_agg(port);
1384 ad_agg_selection_logic(aggregator);
1385}
1386
3bf2d28a 1387/* Decide if "agg" is a better choice for the new active aggregator that
fd989c83
JV		 1388 * the current best, according to the ad_select policy.
1389 */
1390static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1391 struct aggregator *curr)
1392{
3bf2d28a 1393 /* 0. If no best, select current.
fd989c83
JV		 1394 *
1395 * 1. If the current agg is not individual, and the best is
1396 * individual, select current.
1397 *
1398 * 2. If current agg is individual and the best is not, keep best.
1399 *
1400 * 3. Therefore, current and best are both individual or both not
1401 * individual, so:
1402 *
1403 * 3a. If current agg partner replied, and best agg partner did not,
1404 * select current.
1405 *
1406 * 3b. If current agg partner did not reply and best agg partner
1407 * did reply, keep best.
1408 *
1409 * 4. Therefore, current and best both have partner replies or
1410 * both do not, so perform selection policy:
1411 *
1412 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1413 * select by bandwidth.
1414 *
1415 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1416 */
1417 if (!best)
1418 return curr;
1419
1420 if (!curr->is_individual && best->is_individual)
1421 return curr;
1422
1423 if (curr->is_individual && !best->is_individual)
1424 return best;
1425
1426 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1427 return curr;
1428
1429 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1430 return best;
1431
1432 switch (__get_agg_selection_mode(curr->lag_ports)) {
1433 case BOND_AD_COUNT:
1434 if (curr->num_of_ports > best->num_of_ports)
1435 return curr;
1436
1437 if (curr->num_of_ports < best->num_of_ports)
1438 return best;
1439
1440 /*FALLTHROUGH*/
1441 case BOND_AD_STABLE:
1442 case BOND_AD_BANDWIDTH:
1443 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1444 return curr;
1445
1446 break;
1447
1448 default:
ed3587fa
VF		 1449 pr_warn("%s: Impossible agg select mode %d\n",
1450 curr->slave->bond->dev->name,
1451 __get_agg_selection_mode(curr->lag_ports));
fd989c83 1452 break;
1da177e4 1453 }
fd989c83
JV		 1454
1455 return best;
1da177e4
LT		 1456}
1457
4cd6fe1c
SH		 1458static int agg_device_up(const struct aggregator *agg)
1459{
2430af8b 1460 struct port *port = agg->lag_ports;
3bf2d28a 1461
2430af8b
JB		 1462 if (!port)
1463 return 0;
3bf2d28a
VF		 1464
1465 return netif_running(port->slave->dev) &&
1466 netif_carrier_ok(port->slave->dev);
4cd6fe1c
SH		 1467}
1468
1da177e4
LT		 1469/**
1470 * ad_agg_selection_logic - select an aggregation group for a team
1471 * @aggregator: the aggregator we're looking at
1472 *
1473 * It is assumed that only one aggregator may be selected for a team.
fd989c83
JV		 1474 *
1475 * The logic of this function is to select the aggregator according to
1476 * the ad_select policy:
1477 *
1478 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1479 * it, and to reselect the active aggregator only if the previous
1480 * aggregator has no more ports related to it.
1481 *
1482 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1483 * bandwidth, and reselect whenever a link state change takes place or the
1484 * set of slaves in the bond changes.
1485 *
1486 * BOND_AD_COUNT: select the aggregator with largest number of ports
1487 * (slaves), and reselect whenever a link state change takes place or the
1488 * set of slaves in the bond changes.
1da177e4
LT		 1489 *
1490 * FIXME: this function MUST be called with the first agg in the bond, or
1491 * __get_active_agg() won't work correctly. This function should be better
1492 * called with the bond itself, and retrieve the first agg from it.
1493 */
fd989c83 1494static void ad_agg_selection_logic(struct aggregator *agg)
1da177e4 1495{
fd989c83 1496 struct aggregator *best, *active, *origin;
bef1fcce
VF		 1497 struct bonding *bond = agg->slave->bond;
1498 struct list_head *iter;
1499 struct slave *slave;
1da177e4 1500 struct port *port;
1da177e4 1501
fd989c83 1502 origin = agg;
fd989c83 1503 active = __get_active_agg(agg);
4cd6fe1c 1504 best = (active && agg_device_up(active)) ? active : NULL;
1da177e4 1505
be79bd04 1506 rcu_read_lock();
1507 bond_for_each_slave_rcu(bond, slave, iter) {
bef1fcce
VF		 1508 agg = &(SLAVE_AD_INFO(slave).aggregator);
1509
fd989c83
JV		 1510 agg->is_active = 0;
1511
4cd6fe1c 1512 if (agg->num_of_ports && agg_device_up(agg))
fd989c83 1513 best = ad_agg_selection_test(best, agg);
bef1fcce 1514 }
fd989c83
JV		 1515
1516 if (best &&
1517 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
3bf2d28a 1518 /* For the STABLE policy, don't replace the old active
fd989c83
JV		 1519 * aggregator if it's still active (it has an answering
1520 * partner) or if both the best and active don't have an
1521 * answering partner.
1522 */
1523 if (active && active->lag_ports &&
1524 active->lag_ports->is_enabled &&
1525 (__agg_has_partner(active) ||
3bf2d28a
VF		 1526 (!__agg_has_partner(active) &&
1527 !__agg_has_partner(best)))) {
fd989c83
JV		 1528 if (!(!active->actor_oper_aggregator_key &&
1529 best->actor_oper_aggregator_key)) {
1530 best = NULL;
1531 active->is_active = 1;
1da177e4
LT		 1532 }
1533 }
fd989c83 1534 }
1da177e4 1535
fd989c83
JV		 1536 if (best && (best == active)) {
1537 best = NULL;
1538 active->is_active = 1;
1da177e4
LT		 1539 }
1540
be79bd04 1541 /* if there is new best aggregator, activate it */
fd989c83 1542 if (best) {
5a03cdb7 1543 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
a4aee5c8
JP		 1544 best->aggregator_identifier, best->num_of_ports,
1545 best->actor_oper_aggregator_key,
1546 best->partner_oper_aggregator_key,
1547 best->is_individual, best->is_active);
5a03cdb7 1548 pr_debug("best ports %p slave %p %s\n",
a4aee5c8
JP		 1549 best->lag_ports, best->slave,
1550 best->slave ? best->slave->dev->name : "NULL");
fd989c83 1551
be79bd04 1552 bond_for_each_slave_rcu(bond, slave, iter) {
bef1fcce 1553 agg = &(SLAVE_AD_INFO(slave).aggregator);
fd989c83 1554
5a03cdb7 1555 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
a4aee5c8
JP		 1556 agg->aggregator_identifier, agg->num_of_ports,
1557 agg->actor_oper_aggregator_key,
1558 agg->partner_oper_aggregator_key,
1559 agg->is_individual, agg->is_active);
1da177e4
LT		 1560 }
1561
be79bd04 1562 /* check if any partner replys */
fd989c83 1563 if (best->is_individual) {
ed3587fa 1564 pr_warn("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
be79bd04 1565 best->slave ?
1566 best->slave->bond->dev->name : "NULL");
1da177e4
LT		 1567 }
1568
fd989c83 1569 best->is_active = 1;
5a03cdb7 1570 pr_debug("LAG %d chosen as the active LAG\n",
a4aee5c8 1571 best->aggregator_identifier);
5a03cdb7 1572 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
a4aee5c8
JP		 1573 best->aggregator_identifier, best->num_of_ports,
1574 best->actor_oper_aggregator_key,
1575 best->partner_oper_aggregator_key,
1576 best->is_individual, best->is_active);
1da177e4 1577
3bf2d28a
VF		 1578 /* disable the ports that were related to the former
1579 * active_aggregator
1580 */
fd989c83
JV		 1581 if (active) {
1582 for (port = active->lag_ports; port;
1583 port = port->next_port_in_aggregator) {
1da177e4
LT		 1584 __disable_port(port);
1585 }
1586 }
1587 }
1588
3bf2d28a 1589 /* if the selected aggregator is of join individuals
fd989c83
JV		 1590 * (partner_system is NULL), enable their ports
1591 */
1592 active = __get_active_agg(origin);
1da177e4 1593
fd989c83
JV		 1594 if (active) {
1595 if (!__agg_has_partner(active)) {
1596 for (port = active->lag_ports; port;
1597 port = port->next_port_in_aggregator) {
1da177e4
LT		 1598 __enable_port(port);
1599 }
1600 }
1601 }
fd989c83 1602
be79bd04 1603 rcu_read_unlock();
1604
bef1fcce 1605 bond_3ad_set_carrier(bond);
1da177e4
LT		 1606}
1607
1608/**
1609 * ad_clear_agg - clear a given aggregator's parameters
1610 * @aggregator: the aggregator we're looking at
1da177e4
LT		 1611 */
1612static void ad_clear_agg(struct aggregator *aggregator)
1613{
1614 if (aggregator) {
1624db7b 1615 aggregator->is_individual = false;
1da177e4
LT		 1616 aggregator->actor_admin_aggregator_key = 0;
1617 aggregator->actor_oper_aggregator_key = 0;
1618 aggregator->partner_system = null_mac_addr;
1619 aggregator->partner_system_priority = 0;
1620 aggregator->partner_oper_aggregator_key = 0;
1621 aggregator->receive_state = 0;
1622 aggregator->transmit_state = 0;
1623 aggregator->lag_ports = NULL;
1624 aggregator->is_active = 0;
1625 aggregator->num_of_ports = 0;
a4aee5c8
JP		 1626 pr_debug("LAG %d was cleared\n",
1627 aggregator->aggregator_identifier);
1da177e4
LT		 1628 }
1629}
1630
1631/**
1632 * ad_initialize_agg - initialize a given aggregator's parameters
1633 * @aggregator: the aggregator we're looking at
1da177e4
LT		 1634 */
1635static void ad_initialize_agg(struct aggregator *aggregator)
1636{
1637 if (aggregator) {
1638 ad_clear_agg(aggregator);
1639
1640 aggregator->aggregator_mac_address = null_mac_addr;
1641 aggregator->aggregator_identifier = 0;
1642 aggregator->slave = NULL;
1643 }
1644}
1645
1646/**
1647 * ad_initialize_port - initialize a given port's parameters
1648 * @aggregator: the aggregator we're looking at
1649 * @lacp_fast: boolean. whether fast periodic should be used
1da177e4
LT		 1650 */
1651static void ad_initialize_port(struct port *port, int lacp_fast)
1652{
c7e703d0
HE		 1653 static const struct port_params tmpl = {
1654 .system_priority = 0xffff,
1655 .key = 1,
1656 .port_number = 1,
1657 .port_priority = 0xff,
1658 .port_state = 1,
1659 };
7addeef6
HE		 1660 static const struct lacpdu lacpdu = {
1661 .subtype = 0x01,
1662 .version_number = 0x01,
1663 .tlv_type_actor_info = 0x01,
1664 .actor_information_length = 0x14,
1665 .tlv_type_partner_info = 0x02,
1666 .partner_information_length = 0x14,
1667 .tlv_type_collector_info = 0x03,
1668 .collector_information_length = 0x10,
1669 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1670 };
c7e703d0 1671
1da177e4
LT		 1672 if (port) {
1673 port->actor_port_number = 1;
1674 port->actor_port_priority = 0xff;
1675 port->actor_system = null_mac_addr;
1676 port->actor_system_priority = 0xffff;
1677 port->actor_port_aggregator_identifier = 0;
d238d458 1678 port->ntt = false;
1da177e4
LT		 1679 port->actor_admin_port_key = 1;
1680 port->actor_oper_port_key = 1;
3bf2d28a
VF		 1681 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1682 AD_STATE_LACP_ACTIVITY;
1683 port->actor_oper_port_state = AD_STATE_AGGREGATION |
1684 AD_STATE_LACP_ACTIVITY;
1da177e4 1685
7bfc4753 1686 if (lacp_fast)
1da177e4 1687 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1da177e4 1688
c7e703d0
HE		 1689 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1690 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1691
f48127b6 1692 port->is_enabled = true;
3bf2d28a 1693 /* private parameters */
1da177e4
LT		 1694 port->sm_vars = 0x3;
1695 port->sm_rx_state = 0;
1696 port->sm_rx_timer_counter = 0;
1697 port->sm_periodic_state = 0;
1698 port->sm_periodic_timer_counter = 0;
1699 port->sm_mux_state = 0;
1700 port->sm_mux_timer_counter = 0;
1701 port->sm_tx_state = 0;
1702 port->sm_tx_timer_counter = 0;
1703 port->slave = NULL;
1704 port->aggregator = NULL;
1705 port->next_port_in_aggregator = NULL;
1706 port->transaction_id = 0;
1707
7addeef6 1708 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1da177e4
LT		 1709 }
1710}
1711
1712/**
1713 * ad_enable_collecting_distributing - enable a port's transmit/receive
1714 * @port: the port we're looking at
1715 *
1716 * Enable @port if it's in an active aggregator
1717 */
1718static void ad_enable_collecting_distributing(struct port *port)
1719{
1720 if (port->aggregator->is_active) {
a4aee5c8
JP		 1721 pr_debug("Enabling port %d(LAG %d)\n",
1722 port->actor_port_number,
1723 port->aggregator->aggregator_identifier);
1da177e4
LT		 1724 __enable_port(port);
1725 }
1726}
1727
1728/**
1729 * ad_disable_collecting_distributing - disable a port's transmit/receive
1730 * @port: the port we're looking at
1da177e4
LT		 1731 */
1732static void ad_disable_collecting_distributing(struct port *port)
1733{
3bf2d28a
VF		 1734 if (port->aggregator &&
1735 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1736 &(null_mac_addr))) {
a4aee5c8
JP		 1737 pr_debug("Disabling port %d(LAG %d)\n",
1738 port->actor_port_number,
1739 port->aggregator->aggregator_identifier);
1da177e4
LT		 1740 __disable_port(port);
1741 }
1742}
1743
1da177e4
LT		 1744/**
1745 * ad_marker_info_received - handle receive of a Marker information frame
1746 * @marker_info: Marker info received
1747 * @port: the port we're looking at
1da177e4 1748 */
1c3f0b8e
MD		 1749static void ad_marker_info_received(struct bond_marker *marker_info,
1750 struct port *port)
1da177e4 1751{
1c3f0b8e 1752 struct bond_marker marker;
1da177e4 1753
3bf2d28a 1754 /* copy the received marker data to the response marker */
1c3f0b8e 1755 memcpy(&marker, marker_info, sizeof(struct bond_marker));
3bf2d28a 1756 /* change the marker subtype to marker response */
128ea6c3 1757 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1da177e4 1758
3bf2d28a 1759 /* send the marker response */
1da177e4 1760 if (ad_marker_send(port, &marker) >= 0) {
a4aee5c8
JP		 1761 pr_debug("Sent Marker Response on port %d\n",
1762 port->actor_port_number);
1da177e4
LT		 1763 }
1764}
1765
1766/**
1767 * ad_marker_response_received - handle receive of a marker response frame
1768 * @marker: marker PDU received
1769 * @port: the port we're looking at
1770 *
1771 * This function does nothing since we decided not to implement send and handle
1772 * response for marker PDU's, in this stage, but only to respond to marker
1773 * information.
1774 */
1c3f0b8e 1775static void ad_marker_response_received(struct bond_marker *marker,
3bf2d28a 1776 struct port *port)
1da177e4 1777{
3bf2d28a
VF		 1778 marker = NULL;
1779 port = NULL;
1780 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1da177e4
LT		 1781}
1782
3bf2d28a 1783/* ========= AD exported functions to the main bonding code ========= */
1da177e4 1784
3bf2d28a 1785/* Check aggregators status in team every T seconds */
1da177e4
LT		 1786#define AD_AGGREGATOR_SELECTION_TIMER 8
1787
3bf2d28a
VF		 1788/**
1789 * bond_3ad_initiate_agg_selection - initate aggregator selection
1790 * @bond: bonding struct
fd989c83
JV		 1791 *
1792 * Set the aggregation selection timer, to initiate an agg selection in
1793 * the very near future. Called during first initialization, and during
1794 * any down to up transitions of the bond.
1795 */
1796void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1797{
1798 BOND_AD_INFO(bond).agg_select_timer = timeout;
fd989c83
JV		 1799}
1800
1da177e4
LT		 1801static u16 aggregator_identifier;
1802
1803/**
1804 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1805 * @bond: bonding struct to work on
1806 * @tick_resolution: tick duration (millisecond resolution)
1da177e4
LT		 1807 *
1808 * Can be called only after the mac address of the bond is set.
1809 */
56d00c67 1810void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
3a6d54c5 1811{
815117ad 1812 /* check that the bond is not initialized yet */
1813 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
3a6d54c5 1814 bond->dev->dev_addr)) {
1da177e4
LT		 1815
1816 aggregator_identifier = 0;
1817
1da177e4
LT		 1818 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1819 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1820
3bf2d28a
VF		 1821 /* initialize how many times this module is called in one
1822 * second (should be about every 100ms)
1823 */
1da177e4
LT		 1824 ad_ticks_per_sec = tick_resolution;
1825
fd989c83
JV		 1826 bond_3ad_initiate_agg_selection(bond,
1827 AD_AGGREGATOR_SELECTION_TIMER *
1828 ad_ticks_per_sec);
1da177e4
LT		 1829 }
1830}
1831
1832/**
1833 * bond_3ad_bind_slave - initialize a slave's port
1834 * @slave: slave struct to work on
1835 *
1836 * Returns: 0 on success
1837 * < 0 on error
1838 */
359632e5 1839void bond_3ad_bind_slave(struct slave *slave)
1da177e4
LT		 1840{
1841 struct bonding *bond = bond_get_bond_by_slave(slave);
1842 struct port *port;
1843 struct aggregator *aggregator;
1844
359632e5 1845 /* check that the slave has not been initialized yet. */
1da177e4
LT		 1846 if (SLAVE_AD_INFO(slave).port.slave != slave) {
1847
359632e5 1848 /* port initialization */
1da177e4
LT		 1849 port = &(SLAVE_AD_INFO(slave).port);
1850
bf0239a9 1851 ad_initialize_port(port, bond->params.lacp_fast);
1da177e4 1852
e0809dbc 1853 __initialize_port_locks(slave);
1da177e4
LT		 1854 port->slave = slave;
1855 port->actor_port_number = SLAVE_AD_INFO(slave).id;
359632e5 1856 /* key is determined according to the link speed, duplex and user key(which
1857 * is yet not supported)
359632e5 1858 */
3bf2d28a 1859 port->actor_admin_port_key = 0;
1da177e4
LT		 1860 port->actor_admin_port_key |= __get_duplex(port);
1861 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1862 port->actor_oper_port_key = port->actor_admin_port_key;
3bf2d28a
VF		 1863 /* if the port is not full duplex, then the port should be not
1864 * lacp Enabled
1865 */
7bfc4753 1866 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1da177e4 1867 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
359632e5 1868 /* actor system is the bond's system */
1da177e4 1869 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
3bf2d28a
VF		 1870 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1871 * lacpdu's are sent in one second)
1872 */
1da177e4
LT		 1873 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1874 port->aggregator = NULL;
1875 port->next_port_in_aggregator = NULL;
1876
1877 __disable_port(port);
1da177e4 1878
359632e5 1879 /* aggregator initialization */
1da177e4
LT		 1880 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1881
1882 ad_initialize_agg(aggregator);
1883
1884 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1885 aggregator->aggregator_identifier = (++aggregator_identifier);
1886 aggregator->slave = slave;
1887 aggregator->is_active = 0;
1888 aggregator->num_of_ports = 0;
1889 }
1da177e4
LT		 1890}
1891
1892/**
1893 * bond_3ad_unbind_slave - deinitialize a slave's port
1894 * @slave: slave struct to work on
1895 *
1896 * Search for the aggregator that is related to this port, remove the
1897 * aggregator and assign another aggregator for other port related to it
1898 * (if any), and remove the port.
1899 */
1900void bond_3ad_unbind_slave(struct slave *slave)
1901{
1902 struct port *port, *prev_port, *temp_port;
1903 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1904 int select_new_active_agg = 0;
0b088264
VF		 1905 struct bonding *bond = slave->bond;
1906 struct slave *slave_iter;
1907 struct list_head *iter;
a361c83c 1908
1da177e4 1909 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1da177e4
LT		 1910 port = &(SLAVE_AD_INFO(slave).port);
1911
3bf2d28a 1912 /* if slave is null, the whole port is not initialized */
1da177e4 1913 if (!port->slave) {
ed3587fa
VF		 1914 pr_warn("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1915 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 1916 return;
1917 }
1918
a4aee5c8
JP		 1919 pr_debug("Unbinding Link Aggregation Group %d\n",
1920 aggregator->aggregator_identifier);
1da177e4
LT		 1921
1922 /* Tell the partner that this port is not suitable for aggregation */
1923 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1924 __update_lacpdu_from_port(port);
1925 ad_lacpdu_send(port);
1926
3bf2d28a 1927 /* check if this aggregator is occupied */
1da177e4 1928 if (aggregator->lag_ports) {
3bf2d28a
VF		 1929 /* check if there are other ports related to this aggregator
1930 * except the port related to this slave(thats ensure us that
1931 * there is a reason to search for new aggregator, and that we
1932 * will find one
1933 */
1934 if ((aggregator->lag_ports != port) ||
1935 (aggregator->lag_ports->next_port_in_aggregator)) {
1936 /* find new aggregator for the related port(s) */
0b088264
VF		 1937 bond_for_each_slave(bond, slave_iter, iter) {
1938 new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
3bf2d28a
VF		 1939 /* if the new aggregator is empty, or it is
1940 * connected to our port only
1941 */
1942 if (!new_aggregator->lag_ports ||
1943 ((new_aggregator->lag_ports == port) &&
1944 !new_aggregator->lag_ports->next_port_in_aggregator))
1da177e4 1945 break;
1da177e4 1946 }
0b088264
VF		 1947 if (!slave_iter)
1948 new_aggregator = NULL;
3bf2d28a
VF		 1949
1950 /* if new aggregator found, copy the aggregator's
1951 * parameters and connect the related lag_ports to the
1952 * new aggregator
1953 */
1da177e4 1954 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
a4aee5c8
JP		 1955 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
1956 aggregator->aggregator_identifier,
1957 new_aggregator->aggregator_identifier);
1da177e4 1958
3bf2d28a
VF		 1959 if ((new_aggregator->lag_ports == port) &&
1960 new_aggregator->is_active) {
a4aee5c8 1961 pr_info("%s: Removing an active aggregator\n",
471cb5a3 1962 aggregator->slave->bond->dev->name);
1da177e4
LT		 1963 select_new_active_agg = 1;
1964 }
1965
1966 new_aggregator->is_individual = aggregator->is_individual;
1967 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1968 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1969 new_aggregator->partner_system = aggregator->partner_system;
1970 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1971 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1972 new_aggregator->receive_state = aggregator->receive_state;
1973 new_aggregator->transmit_state = aggregator->transmit_state;
1974 new_aggregator->lag_ports = aggregator->lag_ports;
1975 new_aggregator->is_active = aggregator->is_active;
1976 new_aggregator->num_of_ports = aggregator->num_of_ports;
1977
3bf2d28a
VF		 1978 /* update the information that is written on
1979 * the ports about the aggregator
1980 */
128ea6c3
BD		 1981 for (temp_port = aggregator->lag_ports; temp_port;
1982 temp_port = temp_port->next_port_in_aggregator) {
1983 temp_port->aggregator = new_aggregator;
1da177e4
LT		 1984 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1985 }
1986
1da177e4 1987 ad_clear_agg(aggregator);
a361c83c 1988
7bfc4753 1989 if (select_new_active_agg)
1da177e4 1990 ad_agg_selection_logic(__get_first_agg(port));
1da177e4 1991 } else {
ed3587fa
VF		 1992 pr_warn("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
1993 slave->bond->dev->name);
1da177e4 1994 }
3bf2d28a
VF		 1995 } else {
1996 /* in case that the only port related to this
1997 * aggregator is the one we want to remove
1998 */
1da177e4 1999 select_new_active_agg = aggregator->is_active;
1da177e4
LT		 2000 ad_clear_agg(aggregator);
2001 if (select_new_active_agg) {
a4aee5c8 2002 pr_info("%s: Removing an active aggregator\n",
471cb5a3 2003 slave->bond->dev->name);
3bf2d28a 2004 /* select new active aggregator */
74684493
VF		 2005 temp_aggregator = __get_first_agg(port);
2006 if (temp_aggregator)
2007 ad_agg_selection_logic(temp_aggregator);
1da177e4
LT		 2008 }
2009 }
2010 }
2011
5a03cdb7 2012 pr_debug("Unbinding port %d\n", port->actor_port_number);
3bf2d28a
VF		 2013
2014 /* find the aggregator that this port is connected to */
0b088264
VF		 2015 bond_for_each_slave(bond, slave_iter, iter) {
2016 temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
1da177e4 2017 prev_port = NULL;
3bf2d28a 2018 /* search the port in the aggregator's related ports */
128ea6c3
BD		 2019 for (temp_port = temp_aggregator->lag_ports; temp_port;
2020 prev_port = temp_port,
3bf2d28a
VF		 2021 temp_port = temp_port->next_port_in_aggregator) {
2022 if (temp_port == port) {
2023 /* the aggregator found - detach the port from
2024 * this aggregator
2025 */
7bfc4753 2026 if (prev_port)
1da177e4 2027 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
7bfc4753 2028 else
1da177e4 2029 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
1da177e4 2030 temp_aggregator->num_of_ports--;
128ea6c3 2031 if (temp_aggregator->num_of_ports == 0) {
1da177e4 2032 select_new_active_agg = temp_aggregator->is_active;
1da177e4
LT		 2033 ad_clear_agg(temp_aggregator);
2034 if (select_new_active_agg) {
a4aee5c8 2035 pr_info("%s: Removing an active aggregator\n",
471cb5a3 2036 slave->bond->dev->name);
3bf2d28a 2037 /* select new active aggregator */
1da177e4
LT		 2038 ad_agg_selection_logic(__get_first_agg(port));
2039 }
2040 }
2041 break;
2042 }
2043 }
2044 }
128ea6c3 2045 port->slave = NULL;
1da177e4
LT		 2046}
2047
2048/**
2049 * bond_3ad_state_machine_handler - handle state machines timeout
2050 * @bond: bonding struct to work on
2051 *
2052 * The state machine handling concept in this module is to check every tick
2053 * which state machine should operate any function. The execution order is
2054 * round robin, so when we have an interaction between state machines, the
2055 * reply of one to each other might be delayed until next tick.
2056 *
2057 * This function also complete the initialization when the agg_select_timer
2058 * times out, and it selects an aggregator for the ports that are yet not
2059 * related to any aggregator, and selects the active aggregator for a bond.
2060 */
1b76b316 2061void bond_3ad_state_machine_handler(struct work_struct *work)
1da177e4 2062{
1b76b316
JV		 2063 struct bonding *bond = container_of(work, struct bonding,
2064 ad_work.work);
1da177e4 2065 struct aggregator *aggregator;
3c4c88a1
VF		 2066 struct list_head *iter;
2067 struct slave *slave;
2068 struct port *port;
1da177e4 2069
1f2cd845 2070 read_lock(&bond->lock);
be79bd04 2071 rcu_read_lock();
1f2cd845 2072
be79bd04 2073 /* check if there are any slaves */
0965a1f3 2074 if (!bond_has_slaves(bond))
1da177e4 2075 goto re_arm;
1da177e4 2076
be79bd04 2077 /* check if agg_select_timer timer after initialize is timed out */
3bf2d28a
VF		 2078 if (BOND_AD_INFO(bond).agg_select_timer &&
2079 !(--BOND_AD_INFO(bond).agg_select_timer)) {
be79bd04 2080 slave = bond_first_slave_rcu(bond);
fe9323da
VF		 2081 port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
2082
be79bd04 2083 /* select the active aggregator for the bond */
fe9323da 2084 if (port) {
1da177e4 2085 if (!port->slave) {
ed3587fa
VF		 2086 pr_warn("%s: Warning: bond's first port is uninitialized\n",
2087 bond->dev->name);
1da177e4
LT		 2088 goto re_arm;
2089 }
2090
2091 aggregator = __get_first_agg(port);
2092 ad_agg_selection_logic(aggregator);
2093 }
f0c76d61 2094 bond_3ad_set_carrier(bond);
1da177e4
LT		 2095 }
2096
be79bd04 2097 /* for each port run the state machines */
2098 bond_for_each_slave_rcu(bond, slave, iter) {
3c4c88a1 2099 port = &(SLAVE_AD_INFO(slave).port);
1da177e4 2100 if (!port->slave) {
ed3587fa
VF		 2101 pr_warn("%s: Warning: Found an uninitialized port\n",
2102 bond->dev->name);
1da177e4
LT		 2103 goto re_arm;
2104 }
2105
16d79d7d
NC		 2106 /* Lock around state machines to protect data accessed
2107 * by all (e.g., port->sm_vars). ad_rx_machine may run
2108 * concurrently due to incoming LACPDU.
2109 */
9ac3524a 2110 __get_state_machine_lock(port);
16d79d7d 2111
1da177e4
LT		 2112 ad_rx_machine(NULL, port);
2113 ad_periodic_machine(port);
2114 ad_port_selection_logic(port);
2115 ad_mux_machine(port);
2116 ad_tx_machine(port);
2117
be79bd04 2118 /* turn off the BEGIN bit, since we already handled it */
7bfc4753 2119 if (port->sm_vars & AD_PORT_BEGIN)
1da177e4 2120 port->sm_vars &= ~AD_PORT_BEGIN;
16d79d7d 2121
9ac3524a 2122 __release_state_machine_lock(port);
1da177e4
LT		 2123 }
2124
2125re_arm:
be79bd04 2126 rcu_read_unlock();
1f2cd845 2127 read_unlock(&bond->lock);
be79bd04 2128 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
1da177e4
LT		 2129}
2130
2131/**
2132 * bond_3ad_rx_indication - handle a received frame
2133 * @lacpdu: received lacpdu
2134 * @slave: slave struct to work on
2135 * @length: length of the data received
2136 *
2137 * It is assumed that frames that were sent on this NIC don't returned as new
2138 * received frames (loopback). Since only the payload is given to this
2139 * function, it check for loopback.
2140 */
3bf2d28a
VF		 2141static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2142 u16 length)
1da177e4
LT		 2143{
2144 struct port *port;
13a8e0c8 2145 int ret = RX_HANDLER_ANOTHER;
1da177e4
LT		 2146
2147 if (length >= sizeof(struct lacpdu)) {
2148
2149 port = &(SLAVE_AD_INFO(slave).port);
2150
2151 if (!port->slave) {
ed3587fa
VF		 2152 pr_warn("%s: Warning: port of slave %s is uninitialized\n",
2153 slave->dev->name, slave->bond->dev->name);
13a8e0c8 2154 return ret;
1da177e4
LT		 2155 }
2156
2157 switch (lacpdu->subtype) {
2158 case AD_TYPE_LACPDU:
13a8e0c8 2159 ret = RX_HANDLER_CONSUMED;
a4aee5c8
JP		 2160 pr_debug("Received LACPDU on port %d\n",
2161 port->actor_port_number);
16d79d7d 2162 /* Protect against concurrent state machines */
9ac3524a 2163 __get_state_machine_lock(port);
1da177e4 2164 ad_rx_machine(lacpdu, port);
9ac3524a 2165 __release_state_machine_lock(port);
1da177e4
LT		 2166 break;
2167
2168 case AD_TYPE_MARKER:
13a8e0c8 2169 ret = RX_HANDLER_CONSUMED;
3bf2d28a
VF		 2170 /* No need to convert fields to Little Endian since we
2171 * don't use the marker's fields.
2172 */
1da177e4 2173
1c3f0b8e 2174 switch (((struct bond_marker *)lacpdu)->tlv_type) {
1da177e4 2175 case AD_MARKER_INFORMATION_SUBTYPE:
a4aee5c8
JP		 2176 pr_debug("Received Marker Information on port %d\n",
2177 port->actor_port_number);
1c3f0b8e 2178 ad_marker_info_received((struct bond_marker *)lacpdu, port);
1da177e4
LT		 2179 break;
2180
2181 case AD_MARKER_RESPONSE_SUBTYPE:
a4aee5c8
JP		 2182 pr_debug("Received Marker Response on port %d\n",
2183 port->actor_port_number);
1c3f0b8e 2184 ad_marker_response_received((struct bond_marker *)lacpdu, port);
1da177e4
LT		 2185 break;
2186
2187 default:
a4aee5c8
JP		 2188 pr_debug("Received an unknown Marker subtype on slot %d\n",
2189 port->actor_port_number);
1da177e4
LT		 2190 }
2191 }
2192 }
13a8e0c8 2193 return ret;
1da177e4
LT		 2194}
2195
2196/**
2197 * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2198 * @slave: slave struct to work on
2199 *
2200 * Handle reselection of aggregator (if needed) for this port.
2201 */
2202void bond_3ad_adapter_speed_changed(struct slave *slave)
2203{
2204 struct port *port;
2205
2206 port = &(SLAVE_AD_INFO(slave).port);
2207
71a06c59 2208 /* if slave is null, the whole port is not initialized */
1da177e4 2209 if (!port->slave) {
ed3587fa
VF		 2210 pr_warn("Warning: %s: speed changed for uninitialized port on %s\n",
2211 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 2212 return;
2213 }
2214
71a06c59 2215 __get_state_machine_lock(port);
2216
1da177e4 2217 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
128ea6c3
BD		 2218 port->actor_oper_port_key = port->actor_admin_port_key |=
2219 (__get_link_speed(port) << 1);
5a03cdb7 2220 pr_debug("Port %d changed speed\n", port->actor_port_number);
71a06c59 2221 /* there is no need to reselect a new aggregator, just signal the
2222 * state machines to reinitialize
2223 */
1da177e4 2224 port->sm_vars |= AD_PORT_BEGIN;
71a06c59 2225
2226 __release_state_machine_lock(port);
1da177e4
LT		 2227}
2228
2229/**
2230 * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2231 * @slave: slave struct to work on
2232 *
2233 * Handle reselection of aggregator (if needed) for this port.
2234 */
2235void bond_3ad_adapter_duplex_changed(struct slave *slave)
2236{
2237 struct port *port;
2238
128ea6c3 2239 port = &(SLAVE_AD_INFO(slave).port);
1da177e4 2240
bca44a73 2241 /* if slave is null, the whole port is not initialized */
1da177e4 2242 if (!port->slave) {
ed3587fa
VF		 2243 pr_warn("%s: Warning: duplex changed for uninitialized port on %s\n",
2244 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 2245 return;
2246 }
2247
bca44a73 2248 __get_state_machine_lock(port);
2249
1da177e4 2250 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
128ea6c3
BD		 2251 port->actor_oper_port_key = port->actor_admin_port_key |=
2252 __get_duplex(port);
5a03cdb7 2253 pr_debug("Port %d changed duplex\n", port->actor_port_number);
bca44a73 2254 /* there is no need to reselect a new aggregator, just signal the
2255 * state machines to reinitialize
2256 */
1da177e4 2257 port->sm_vars |= AD_PORT_BEGIN;
bca44a73 2258
2259 __release_state_machine_lock(port);
1da177e4
LT		 2260}
2261
2262/**
2263 * bond_3ad_handle_link_change - handle a slave's link status change indication
2264 * @slave: slave struct to work on
2265 * @status: whether the link is now up or down
2266 *
2267 * Handle reselection of aggregator (if needed) for this port.
2268 */
2269void bond_3ad_handle_link_change(struct slave *slave, char link)
2270{
2271 struct port *port;
2272
2273 port = &(SLAVE_AD_INFO(slave).port);
2274
108db736 2275 /* if slave is null, the whole port is not initialized */
1da177e4 2276 if (!port->slave) {
ed3587fa
VF		 2277 pr_warn("Warning: %s: link status changed for uninitialized port on %s\n",
2278 slave->bond->dev->name, slave->dev->name);
1da177e4
LT		 2279 return;
2280 }
2281
108db736 2282 __get_state_machine_lock(port);
2283 /* on link down we are zeroing duplex and speed since
2284 * some of the adaptors(ce1000.lan) report full duplex/speed
2285 * instead of N/A(duplex) / 0(speed).
2286 *
2287 * on link up we are forcing recheck on the duplex and speed since
2288 * some of he adaptors(ce1000.lan) report.
2289 */
1da177e4 2290 if (link == BOND_LINK_UP) {
f48127b6 2291 port->is_enabled = true;
1da177e4 2292 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
128ea6c3
BD		 2293 port->actor_oper_port_key = port->actor_admin_port_key |=
2294 __get_duplex(port);
1da177e4 2295 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
128ea6c3
BD		 2296 port->actor_oper_port_key = port->actor_admin_port_key |=
2297 (__get_link_speed(port) << 1);
1da177e4
LT		 2298 } else {
2299 /* link has failed */
f48127b6 2300 port->is_enabled = false;
1da177e4 2301 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
128ea6c3
BD		 2302 port->actor_oper_port_key = (port->actor_admin_port_key &=
2303 ~AD_SPEED_KEY_BITS);
1da177e4 2304 }
108db736 2305 pr_debug("Port %d changed link status to %s",
2306 port->actor_port_number,
2307 (link == BOND_LINK_UP) ? "UP" : "DOWN");
2308 /* there is no need to reselect a new aggregator, just signal the
2309 * state machines to reinitialize
2310 */
1da177e4 2311 port->sm_vars |= AD_PORT_BEGIN;
108db736 2312
2313 __release_state_machine_lock(port);
1da177e4
LT		 2314}
2315
3bf2d28a
VF		 2316/**
2317 * bond_3ad_set_carrier - set link state for bonding master
2318 * @bond - bonding structure
2319 *
2320 * if we have an active aggregator, we're up, if not, we're down.
2321 * Presumes that we cannot have an active aggregator if there are
2322 * no slaves with link up.
ff59c456 2323 *
031ae4de
JV		 2324 * This behavior complies with IEEE 802.3 section 43.3.9.
2325 *
ff59c456
JV		 2326 * Called by bond_set_carrier(). Return zero if carrier state does not
2327 * change, nonzero if it does.
2328 */
2329int bond_3ad_set_carrier(struct bonding *bond)
2330{
655f8919 2331 struct aggregator *active;
dec1e90e 2332 struct slave *first_slave;
c1bc9644 2333 int ret = 1;
655f8919 2334
be79bd04 2335 rcu_read_lock();
2336 first_slave = bond_first_slave_rcu(bond);
c1bc9644
VF		 2337 if (!first_slave) {
2338 ret = 0;
2339 goto out;
2340 }
dec1e90e 2341 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
655f8919 2342 if (active) {
2343 /* are enough slaves available to consider link up? */
2344 if (active->num_of_ports < bond->params.min_links) {
2345 if (netif_carrier_ok(bond->dev)) {
2346 netif_carrier_off(bond->dev);
c1bc9644 2347 goto out;
655f8919 2348 }
2349 } else if (!netif_carrier_ok(bond->dev)) {
ff59c456 2350 netif_carrier_on(bond->dev);
c1bc9644 2351 goto out;
ff59c456 2352 }
c1bc9644 2353 } else if (netif_carrier_ok(bond->dev)) {
ff59c456 2354 netif_carrier_off(bond->dev);
ff59c456 2355 }
c1bc9644
VF		 2356out:
2357 rcu_read_unlock();
2358 return ret;
ff59c456
JV		 2359}
2360
1da177e4 2361/**
318debd8 2362 * __bond_3ad_get_active_agg_info - get information of the active aggregator
1da177e4
LT		 2363 * @bond: bonding struct to work on
2364 * @ad_info: ad_info struct to fill with the bond's info
2365 *
2366 * Returns: 0 on success
2367 * < 0 on error
2368 */
318debd8 2369int __bond_3ad_get_active_agg_info(struct bonding *bond,
2370 struct ad_info *ad_info)
1da177e4
LT		 2371{
2372 struct aggregator *aggregator = NULL;
3c4c88a1
VF		 2373 struct list_head *iter;
2374 struct slave *slave;
1da177e4
LT		 2375 struct port *port;
2376
47e91f56 2377 bond_for_each_slave_rcu(bond, slave, iter) {
3c4c88a1 2378 port = &(SLAVE_AD_INFO(slave).port);
1da177e4
LT		 2379 if (port->aggregator && port->aggregator->is_active) {
2380 aggregator = port->aggregator;
2381 break;
2382 }
2383 }
2384
2385 if (aggregator) {
2386 ad_info->aggregator_id = aggregator->aggregator_identifier;
2387 ad_info->ports = aggregator->num_of_ports;
2388 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2389 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
3bf2d28a
VF		 2390 memcpy(ad_info->partner_system,
2391 aggregator->partner_system.mac_addr_value, ETH_ALEN);
1da177e4
LT		 2392 return 0;
2393 }
2394
2395 return -1;
2396}
2397
318debd8 2398/* Wrapper used to hold bond->lock so no slave manipulation can occur */
2399int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2400{
2401 int ret;
2402
47e91f56 2403 rcu_read_lock();
318debd8 2404 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
47e91f56 2405 rcu_read_unlock();
318debd8 2406
2407 return ret;
2408}
2409
1da177e4
LT		 2410int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2411{
454d7c9b 2412 struct bonding *bond = netdev_priv(dev);
c33d7887
VF		 2413 struct slave *slave, *first_ok_slave;
2414 struct aggregator *agg;
2415 struct ad_info ad_info;
9caff1e7 2416 struct list_head *iter;
1da177e4 2417 int slaves_in_agg;
c33d7887 2418 int slave_agg_no;
c33d7887 2419 int agg_id;
1da177e4 2420
318debd8 2421 if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2422 pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
a4aee5c8 2423 dev->name);
a742e1f5 2424 goto err_free;
1da177e4
LT		 2425 }
2426
2427 slaves_in_agg = ad_info.ports;
2428 agg_id = ad_info.aggregator_id;
2429
2430 if (slaves_in_agg == 0) {
a4aee5c8 2431 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
a742e1f5 2432 goto err_free;
1da177e4
LT		 2433 }
2434
32819dc1 2435 slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
c33d7887 2436 first_ok_slave = NULL;
1da177e4 2437
47e91f56 2438 bond_for_each_slave_rcu(bond, slave, iter) {
c33d7887
VF		 2439 agg = SLAVE_AD_INFO(slave).port.aggregator;
2440 if (!agg || agg->aggregator_identifier != agg_id)
2441 continue;
1da177e4 2442
c33d7887
VF		 2443 if (slave_agg_no >= 0) {
2444 if (!first_ok_slave && SLAVE_IS_OK(slave))
2445 first_ok_slave = slave;
1da177e4 2446 slave_agg_no--;
c33d7887
VF		 2447 continue;
2448 }
2449
2450 if (SLAVE_IS_OK(slave)) {
a742e1f5 2451 bond_dev_queue_xmit(bond, skb, slave->dev);
c33d7887 2452 goto out;
1da177e4
LT		 2453 }
2454 }
2455
2456 if (slave_agg_no >= 0) {
a4aee5c8
JP		 2457 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2458 dev->name, agg_id);
a742e1f5 2459 goto err_free;
1da177e4
LT		 2460 }
2461
c33d7887 2462 /* we couldn't find any suitable slave after the agg_no, so use the
3bf2d28a
VF		 2463 * first suitable found, if found.
2464 */
c33d7887 2465 if (first_ok_slave)
a742e1f5 2466 bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2467 else
2468 goto err_free;
1da177e4
LT		 2469
2470out:
ec634fe3 2471 return NETDEV_TX_OK;
a742e1f5 2472err_free:
2473 /* no suitable interface, frame not sent */
2474 kfree_skb(skb);
2475 goto out;
1da177e4
LT		 2476}
2477
de063b70
ED		 2478int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2479 struct slave *slave)
1da177e4 2480{
13a8e0c8 2481 int ret = RX_HANDLER_ANOTHER;
de063b70
ED		 2482 struct lacpdu *lacpdu, _lacpdu;
2483
3aba891d 2484 if (skb->protocol != PKT_TYPE_LACPDU)
13a8e0c8 2485 return ret;
b3053251 2486
de063b70
ED		 2487 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2488 if (!lacpdu)
13a8e0c8 2489 return ret;
ab12811c 2490
1da177e4 2491 read_lock(&bond->lock);
de063b70 2492 ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
1da177e4 2493 read_unlock(&bond->lock);
13a8e0c8 2494 return ret;
1da177e4 2495}
ba824a8b 2496
3bf2d28a
VF		 2497/**
2498 * bond_3ad_update_lacp_rate - change the lacp rate
2499 * @bond - bonding struct
2500 *
ba824a8b
PP		 2501 * When modify lacp_rate parameter via sysfs,
2502 * update actor_oper_port_state of each port.
2503 *
2504 * Hold slave->state_machine_lock,
2505 * so we can modify port->actor_oper_port_state,
2506 * no matter bond is up or down.
2507 */
2508void bond_3ad_update_lacp_rate(struct bonding *bond)
2509{
ba824a8b 2510 struct port *port = NULL;
9caff1e7 2511 struct list_head *iter;
c509316b 2512 struct slave *slave;
ba824a8b
PP		 2513 int lacp_fast;
2514
ba824a8b 2515 lacp_fast = bond->params.lacp_fast;
9caff1e7 2516 bond_for_each_slave(bond, slave, iter) {
ba824a8b
PP		 2517 port = &(SLAVE_AD_INFO(slave).port);
2518 __get_state_machine_lock(port);
2519 if (lacp_fast)
2520 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2521 else
2522 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2523 __release_state_machine_lock(port);
2524 }
ba824a8b 2525}
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