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Merge branch 'kernel_socket_netns'
[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
1da177e4
LT		 23#include <linux/skbuff.h>
24#include <linux/if_ether.h>
25#include <linux/netdevice.h>
26#include <linux/spinlock.h>
27#include <linux/ethtool.h>
fd989c83 28#include <linux/etherdevice.h>
1da177e4
LT		 29#include <linux/if_bonding.h>
30#include <linux/pkt_sched.h>
e730c155 31#include <net/net_namespace.h>
1ef8019b
DM		 32#include <net/bonding.h>
33#include <net/bond_3ad.h>
1da177e4 34
3bf2d28a 35/* General definitions */
1da177e4
LT		 36#define AD_SHORT_TIMEOUT 1
37#define AD_LONG_TIMEOUT 0
38#define AD_STANDBY 0x2
39#define AD_MAX_TX_IN_SECOND 3
40#define AD_COLLECTOR_MAX_DELAY 0
41
3bf2d28a 42/* Timer definitions (43.4.4 in the 802.3ad standard) */
1da177e4
LT		 43#define AD_FAST_PERIODIC_TIME 1
44#define AD_SLOW_PERIODIC_TIME 30
45#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME)
46#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME)
47#define AD_CHURN_DETECTION_TIME 60
48#define AD_AGGREGATE_WAIT_TIME 2
49
3bf2d28a 50/* Port state definitions (43.4.2.2 in the 802.3ad standard) */
1da177e4
LT		 51#define AD_STATE_LACP_ACTIVITY 0x1
52#define AD_STATE_LACP_TIMEOUT 0x2
53#define AD_STATE_AGGREGATION 0x4
54#define AD_STATE_SYNCHRONIZATION 0x8
55#define AD_STATE_COLLECTING 0x10
56#define AD_STATE_DISTRIBUTING 0x20
57#define AD_STATE_DEFAULTED 0x40
58#define AD_STATE_EXPIRED 0x80
59
3bf2d28a
VF		 60/* Port Variables definitions used by the State Machines (43.4.7 in the
61 * 802.3ad standard)
62 */
1da177e4
LT		 63#define AD_PORT_BEGIN 0x1
64#define AD_PORT_LACP_ENABLED 0x2
65#define AD_PORT_ACTOR_CHURN 0x4
66#define AD_PORT_PARTNER_CHURN 0x8
67#define AD_PORT_READY 0x10
68#define AD_PORT_READY_N 0x20
69#define AD_PORT_MATCHED 0x40
70#define AD_PORT_STANDBY 0x80
71#define AD_PORT_SELECTED 0x100
72#define AD_PORT_MOVED 0x200
ef015d72 73#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
1da177e4 74
3bf2d28a
VF		 75/* Port Key definitions
76 * key is determined according to the link speed, duplex and
77 * user key (which is yet not supported)
78 * --------------------------------------------------------------
79 * Port key : | User key | Speed | Duplex |
80 * --------------------------------------------------------------
81 * 16 6 1 0
82 */
cb8dda90
JX		 83#define AD_DUPLEX_KEY_MASKS 0x1
84#define AD_SPEED_KEY_MASKS 0x3E
85#define AD_USER_KEY_MASKS 0xFFC0
86
87enum ad_link_speed_type {
88 AD_LINK_SPEED_1MBPS = 1,
89 AD_LINK_SPEED_10MBPS,
90 AD_LINK_SPEED_100MBPS,
91 AD_LINK_SPEED_1000MBPS,
424c3232
JX		 92 AD_LINK_SPEED_2500MBPS,
93 AD_LINK_SPEED_10000MBPS,
94 AD_LINK_SPEED_20000MBPS,
95 AD_LINK_SPEED_40000MBPS,
96 AD_LINK_SPEED_56000MBPS
cb8dda90 97};
1da177e4 98
815117ad 99/* compare MAC addresses */
100#define MAC_ADDRESS_EQUAL(A, B) \
101 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
1da177e4 102
128ea6c3 103static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
1da177e4
LT		 104static u16 ad_ticks_per_sec;
105static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
106
e4ac4320
HE		 107static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
108
3bf2d28a 109/* ================= main 802.3ad protocol functions ================== */
1da177e4 110static int ad_lacpdu_send(struct port *port);
1c3f0b8e 111static int ad_marker_send(struct port *port, struct bond_marker *marker);
ee637714 112static void ad_mux_machine(struct port *port, bool *update_slave_arr);
1da177e4
LT		 113static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
114static void ad_tx_machine(struct port *port);
115static void ad_periodic_machine(struct port *port);
ee637714
MB		 116static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
117static void ad_agg_selection_logic(struct aggregator *aggregator,
118 bool *update_slave_arr);
1da177e4
LT		 119static void ad_clear_agg(struct aggregator *aggregator);
120static void ad_initialize_agg(struct aggregator *aggregator);
121static void ad_initialize_port(struct port *port, int lacp_fast);
ee637714
MB		 122static void ad_enable_collecting_distributing(struct port *port,
123 bool *update_slave_arr);
124static void ad_disable_collecting_distributing(struct port *port,
125 bool *update_slave_arr);
3bf2d28a
VF		 126static void ad_marker_info_received(struct bond_marker *marker_info,
127 struct port *port);
128static void ad_marker_response_received(struct bond_marker *marker,
129 struct port *port);
1da177e4
LT		 130
131
3bf2d28a 132/* ================= api to bonding and kernel code ================== */
1da177e4
LT		 133
134/**
135 * __get_bond_by_port - get the port's bonding struct
136 * @port: the port we're looking at
137 *
138 * Return @port's bonding struct, or %NULL if it can't be found.
139 */
140static inline struct bonding *__get_bond_by_port(struct port *port)
141{
7bfc4753 142 if (port->slave == NULL)
1da177e4 143 return NULL;
1da177e4
LT		 144
145 return bond_get_bond_by_slave(port->slave);
146}
147
1da177e4
LT		 148/**
149 * __get_first_agg - get the first aggregator in the bond
150 * @bond: the bond we're looking at
151 *
152 * Return the aggregator of the first slave in @bond, or %NULL if it can't be
153 * found.
768b9549 154 * The caller must hold RCU or RTNL lock.
1da177e4
LT		 155 */
156static inline struct aggregator *__get_first_agg(struct port *port)
157{
158 struct bonding *bond = __get_bond_by_port(port);
dec1e90e 159 struct slave *first_slave;
768b9549 160 struct aggregator *agg;
1da177e4 161
be79bd04 162 /* If there's no bond for this port, or bond has no slaves */
dec1e90e 163 if (bond == NULL)
1da177e4 164 return NULL;
3bf2d28a 165
be79bd04 166 rcu_read_lock();
167 first_slave = bond_first_slave_rcu(bond);
3fdddd85 168 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
be79bd04 169 rcu_read_unlock();
3bf2d28a 170
768b9549 171 return agg;
1da177e4
LT		 172}
173
3bf2d28a
VF		 174/**
175 * __agg_has_partner - see if we have a partner
176 * @agg: the agregator we're looking at
fd989c83
JV		 177 *
178 * Return nonzero if aggregator has a partner (denoted by a non-zero ether
3bf2d28a 179 * address for the partner). Return 0 if not.
fd989c83
JV		 180 */
181static inline int __agg_has_partner(struct aggregator *agg)
182{
183 return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
184}
185
1da177e4
LT		 186/**
187 * __disable_port - disable the port's slave
188 * @port: the port we're looking at
1da177e4
LT		 189 */
190static inline void __disable_port(struct port *port)
191{
5e5b0665 192 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
1da177e4
LT		 193}
194
195/**
196 * __enable_port - enable the port's slave, if it's up
197 * @port: the port we're looking at
1da177e4
LT		 198 */
199static inline void __enable_port(struct port *port)
200{
201 struct slave *slave = port->slave;
202
b6adc610 203 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
5e5b0665 204 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
1da177e4
LT		 205}
206
207/**
208 * __port_is_enabled - check if the port's slave is in active state
209 * @port: the port we're looking at
1da177e4
LT		 210 */
211static inline int __port_is_enabled(struct port *port)
212{
e30bc066 213 return bond_is_active_slave(port->slave);
1da177e4
LT		 214}
215
216/**
217 * __get_agg_selection_mode - get the aggregator selection mode
218 * @port: the port we're looking at
219 *
fd989c83 220 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
1da177e4
LT		 221 */
222static inline u32 __get_agg_selection_mode(struct port *port)
223{
224 struct bonding *bond = __get_bond_by_port(port);
225
7bfc4753 226 if (bond == NULL)
fd989c83 227 return BOND_AD_STABLE;
1da177e4 228
1a14fbcb 229 return bond->params.ad_select;
1da177e4
LT		 230}
231
232/**
233 * __check_agg_selection_timer - check if the selection timer has expired
234 * @port: the port we're looking at
1da177e4
LT		 235 */
236static inline int __check_agg_selection_timer(struct port *port)
237{
238 struct bonding *bond = __get_bond_by_port(port);
239
7bfc4753 240 if (bond == NULL)
1da177e4 241 return 0;
1da177e4
LT		 242
243 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
244}
245
1da177e4
LT		 246/**
247 * __get_link_speed - get a port's speed
248 * @port: the port we're looking at
249 *
cb8dda90 250 * Return @port's speed in 802.3ad enum format. i.e. one of:
1da177e4 251 * 0,
cb8dda90
JX		 252 * %AD_LINK_SPEED_10MBPS,
253 * %AD_LINK_SPEED_100MBPS,
254 * %AD_LINK_SPEED_1000MBPS,
424c3232 255 * %AD_LINK_SPEED_2500MBPS,
cb8dda90 256 * %AD_LINK_SPEED_10000MBPS
424c3232
JX		 257 * %AD_LINK_SPEED_20000MBPS
258 * %AD_LINK_SPEED_40000MBPS
259 * %AD_LINK_SPEED_56000MBPS
1da177e4
LT		 260 */
261static u16 __get_link_speed(struct port *port)
262{
263 struct slave *slave = port->slave;
264 u16 speed;
265
3bf2d28a
VF		 266 /* this if covers only a special case: when the configuration starts
267 * with link down, it sets the speed to 0.
268 * This is done in spite of the fact that the e100 driver reports 0
269 * to be compatible with MVT in the future.
270 */
7bfc4753 271 if (slave->link != BOND_LINK_UP)
128ea6c3 272 speed = 0;
7bfc4753 273 else {
1da177e4
LT		 274 switch (slave->speed) {
275 case SPEED_10:
cb8dda90 276 speed = AD_LINK_SPEED_10MBPS;
1da177e4
LT		 277 break;
278
279 case SPEED_100:
cb8dda90 280 speed = AD_LINK_SPEED_100MBPS;
1da177e4
LT		 281 break;
282
283 case SPEED_1000:
cb8dda90 284 speed = AD_LINK_SPEED_1000MBPS;
1da177e4
LT		 285 break;
286
424c3232
JX		 287 case SPEED_2500:
288 speed = AD_LINK_SPEED_2500MBPS;
289 break;
290
94dbffd5 291 case SPEED_10000:
cb8dda90 292 speed = AD_LINK_SPEED_10000MBPS;
94dbffd5
JV		 293 break;
294
424c3232
JX		 295 case SPEED_20000:
296 speed = AD_LINK_SPEED_20000MBPS;
297 break;
298
299 case SPEED_40000:
300 speed = AD_LINK_SPEED_40000MBPS;
301 break;
302
303 case SPEED_56000:
304 speed = AD_LINK_SPEED_56000MBPS;
305 break;
306
1da177e4 307 default:
3bf2d28a
VF		 308 /* unknown speed value from ethtool. shouldn't happen */
309 speed = 0;
1da177e4
LT		 310 break;
311 }
312 }
313
d4471f5e
VF		 314 netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
315 port->actor_port_number, speed);
1da177e4
LT		 316 return speed;
317}
318
319/**
320 * __get_duplex - get a port's duplex
321 * @port: the port we're looking at
322 *
323 * Return @port's duplex in 802.3ad bitmask format. i.e.:
324 * 0x01 if in full duplex
325 * 0x00 otherwise
326 */
327static u8 __get_duplex(struct port *port)
328{
329 struct slave *slave = port->slave;
1da177e4
LT		 330 u8 retval;
331
3bf2d28a
VF		 332 /* handling a special case: when the configuration starts with
333 * link down, it sets the duplex to 0.
334 */
547942ca 335 if (slave->link != BOND_LINK_UP) {
128ea6c3 336 retval = 0x0;
547942ca 337 } else {
1da177e4
LT		 338 switch (slave->duplex) {
339 case DUPLEX_FULL:
128ea6c3 340 retval = 0x1;
d4471f5e
VF		 341 netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
342 port->actor_port_number);
1da177e4
LT		 343 break;
344 case DUPLEX_HALF:
345 default:
128ea6c3 346 retval = 0x0;
d4471f5e
VF		 347 netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
348 port->actor_port_number);
1da177e4
LT		 349 break;
350 }
351 }
352 return retval;
353}
354
3bf2d28a 355/* Conversions */
1da177e4
LT		 356
357/**
358 * __ad_timer_to_ticks - convert a given timer type to AD module ticks
359 * @timer_type: which timer to operate
360 * @par: timer parameter. see below
361 *
362 * If @timer_type is %current_while_timer, @par indicates long/short timer.
363 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
3bf2d28a 364 * %SLOW_PERIODIC_TIME.
1da177e4
LT		 365 */
366static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
367{
128ea6c3 368 u16 retval = 0; /* to silence the compiler */
1da177e4
LT		 369
370 switch (timer_type) {
3bf2d28a 371 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */
7bfc4753 372 if (par)
3bf2d28a 373 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
7bfc4753 374 else
3bf2d28a 375 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
1da177e4 376 break;
3bf2d28a 377 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */
1da177e4
LT		 378 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
379 break;
3bf2d28a
VF		 380 case AD_PERIODIC_TIMER: /* for periodic machine */
381 retval = (par*ad_ticks_per_sec); /* long timeout */
1da177e4 382 break;
3bf2d28a 383 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */
1da177e4
LT		 384 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
385 break;
3bf2d28a 386 case AD_WAIT_WHILE_TIMER: /* for selection machine */
1da177e4
LT		 387 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
388 break;
389 }
3bf2d28a 390
1da177e4
LT		 391 return retval;
392}
393
394
3bf2d28a 395/* ================= ad_rx_machine helper functions ================== */
1da177e4 396
2d6682db
JV		 397/**
398 * __choose_matched - update a port's matched variable from a received lacpdu
399 * @lacpdu: the lacpdu we've received
400 * @port: the port we're looking at
401 *
402 * Update the value of the matched variable, using parameter values from a
403 * newly received lacpdu. Parameter values for the partner carried in the
404 * received PDU are compared with the corresponding operational parameter
405 * values for the actor. Matched is set to TRUE if all of these parameters
406 * match and the PDU parameter partner_state.aggregation has the same value as
407 * actor_oper_port_state.aggregation and lacp will actively maintain the link
408 * in the aggregation. Matched is also set to TRUE if the value of
409 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
410 * an individual link and lacp will actively maintain the link. Otherwise,
411 * matched is set to FALSE. LACP is considered to be actively maintaining the
412 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
413 * the actor's actor_oper_port_state.lacp_activity and the PDU's
414 * partner_state.lacp_activity variables are TRUE.
415 *
416 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
417 * used here to implement the language from 802.3ad 43.4.9 that requires
418 * recordPDU to "match" the LACPDU parameters to the stored values.
419 */
420static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
421{
815117ad 422 /* check if all parameters are alike
423 * or this is individual link(aggregation == FALSE)
424 * then update the state machine Matched variable.
425 */
2d6682db
JV		 426 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
427 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
815117ad 428 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
2d6682db
JV		 429 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
430 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
431 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
2d6682db
JV		 432 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
433 ) {
2d6682db
JV		 434 port->sm_vars |= AD_PORT_MATCHED;
435 } else {
436 port->sm_vars &= ~AD_PORT_MATCHED;
437 }
438}
439
1da177e4
LT		 440/**
441 * __record_pdu - record parameters from a received lacpdu
442 * @lacpdu: the lacpdu we've received
443 * @port: the port we're looking at
444 *
445 * Record the parameter values for the Actor carried in a received lacpdu as
446 * the current partner operational parameter values and sets
447 * actor_oper_port_state.defaulted to FALSE.
448 */
449static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
450{
1da177e4 451 if (lacpdu && port) {
b99d6ba9
HE		 452 struct port_params *partner = &port->partner_oper;
453
2d6682db 454 __choose_matched(lacpdu, port);
3bf2d28a
VF		 455 /* record the new parameter values for the partner
456 * operational
457 */
b99d6ba9
HE		 458 partner->port_number = ntohs(lacpdu->actor_port);
459 partner->port_priority = ntohs(lacpdu->actor_port_priority);
460 partner->system = lacpdu->actor_system;
461 partner->system_priority = ntohs(lacpdu->actor_system_priority);
462 partner->key = ntohs(lacpdu->actor_key);
463 partner->port_state = lacpdu->actor_state;
1da177e4 464
3bf2d28a 465 /* set actor_oper_port_state.defaulted to FALSE */
1da177e4
LT		 466 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
467
3bf2d28a
VF		 468 /* set the partner sync. to on if the partner is sync,
469 * and the port is matched
470 */
63b46242
WK		 471 if ((port->sm_vars & AD_PORT_MATCHED) &&
472 (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
b99d6ba9 473 partner->port_state |= AD_STATE_SYNCHRONIZATION;
63b46242
WK		 474 pr_debug("%s partner sync=1\n", port->slave->dev->name);
475 } else {
b99d6ba9 476 partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
63b46242
WK		 477 pr_debug("%s partner sync=0\n", port->slave->dev->name);
478 }
1da177e4
LT		 479 }
480}
481
482/**
483 * __record_default - record default parameters
484 * @port: the port we're looking at
485 *
486 * This function records the default parameter values for the partner carried
487 * in the Partner Admin parameters as the current partner operational parameter
488 * values and sets actor_oper_port_state.defaulted to TRUE.
489 */
490static void __record_default(struct port *port)
491{
1da177e4 492 if (port) {
3bf2d28a 493 /* record the partner admin parameters */
5eefd1ad
HE		 494 memcpy(&port->partner_oper, &port->partner_admin,
495 sizeof(struct port_params));
1da177e4 496
3bf2d28a 497 /* set actor_oper_port_state.defaulted to true */
1da177e4
LT		 498 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
499 }
500}
501
502/**
503 * __update_selected - update a port's Selected variable from a received lacpdu
504 * @lacpdu: the lacpdu we've received
505 * @port: the port we're looking at
506 *
507 * Update the value of the selected variable, using parameter values from a
508 * newly received lacpdu. The parameter values for the Actor carried in the
509 * received PDU are compared with the corresponding operational parameter
510 * values for the ports partner. If one or more of the comparisons shows that
511 * the value(s) received in the PDU differ from the current operational values,
512 * then selected is set to FALSE and actor_oper_port_state.synchronization is
513 * set to out_of_sync. Otherwise, selected remains unchanged.
514 */
515static void __update_selected(struct lacpdu *lacpdu, struct port *port)
516{
1da177e4 517 if (lacpdu && port) {
ce6a49ad
HE		 518 const struct port_params *partner = &port->partner_oper;
519
815117ad 520 /* check if any parameter is different then
521 * update the state machine selected variable.
522 */
8e95a202
JP		 523 if (ntohs(lacpdu->actor_port) != partner->port_number ||
524 ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
815117ad 525 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
8e95a202
JP		 526 ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
527 ntohs(lacpdu->actor_key) != partner->key ||
528 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
1da177e4
LT		 529 port->sm_vars &= ~AD_PORT_SELECTED;
530 }
531 }
532}
533
534/**
535 * __update_default_selected - update a port's Selected variable from Partner
536 * @port: the port we're looking at
537 *
538 * This function updates the value of the selected variable, using the partner
539 * administrative parameter values. The administrative values are compared with
540 * the corresponding operational parameter values for the partner. If one or
541 * more of the comparisons shows that the administrative value(s) differ from
542 * the current operational values, then Selected is set to FALSE and
543 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
544 * Selected remains unchanged.
545 */
546static void __update_default_selected(struct port *port)
547{
1da177e4 548 if (port) {
3c52065f
HE		 549 const struct port_params *admin = &port->partner_admin;
550 const struct port_params *oper = &port->partner_oper;
551
815117ad 552 /* check if any parameter is different then
553 * update the state machine selected variable.
554 */
8e95a202
JP		 555 if (admin->port_number != oper->port_number ||
556 admin->port_priority != oper->port_priority ||
815117ad 557 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
8e95a202
JP		 558 admin->system_priority != oper->system_priority ||
559 admin->key != oper->key ||
560 (admin->port_state & AD_STATE_AGGREGATION)
3c52065f 561 != (oper->port_state & AD_STATE_AGGREGATION)) {
1da177e4
LT		 562 port->sm_vars &= ~AD_PORT_SELECTED;
563 }
564 }
565}
566
1da177e4
LT		 567/**
568 * __update_ntt - update a port's ntt variable from a received lacpdu
569 * @lacpdu: the lacpdu we've received
570 * @port: the port we're looking at
571 *
572 * Updates the value of the ntt variable, using parameter values from a newly
573 * received lacpdu. The parameter values for the partner carried in the
574 * received PDU are compared with the corresponding operational parameter
575 * values for the Actor. If one or more of the comparisons shows that the
576 * value(s) received in the PDU differ from the current operational values,
577 * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
578 */
579static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
580{
815117ad 581 /* validate lacpdu and port */
1da177e4 582 if (lacpdu && port) {
815117ad 583 /* check if any parameter is different then
584 * update the port->ntt.
585 */
89cc76f9
JV		 586 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
587 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
815117ad 588 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
89cc76f9
JV		 589 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
590 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
1da177e4
LT		 591 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
592 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
593 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
594 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
595 ) {
d238d458 596 port->ntt = true;
1da177e4
LT		 597 }
598 }
599}
600
1da177e4
LT		 601/**
602 * __agg_ports_are_ready - check if all ports in an aggregator are ready
603 * @aggregator: the aggregator we're looking at
604 *
605 */
606static int __agg_ports_are_ready(struct aggregator *aggregator)
607{
608 struct port *port;
609 int retval = 1;
610
611 if (aggregator) {
3bf2d28a
VF		 612 /* scan all ports in this aggregator to verfy if they are
613 * all ready.
614 */
128ea6c3
BD		 615 for (port = aggregator->lag_ports;
616 port;
617 port = port->next_port_in_aggregator) {
1da177e4
LT		 618 if (!(port->sm_vars & AD_PORT_READY_N)) {
619 retval = 0;
620 break;
621 }
622 }
623 }
624
625 return retval;
626}
627
628/**
629 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
630 * @aggregator: the aggregator we're looking at
631 * @val: Should the ports' ready bit be set on or off
632 *
633 */
634static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
635{
636 struct port *port;
637
128ea6c3
BD		 638 for (port = aggregator->lag_ports; port;
639 port = port->next_port_in_aggregator) {
7bfc4753 640 if (val)
1da177e4 641 port->sm_vars |= AD_PORT_READY;
7bfc4753 642 else
1da177e4 643 port->sm_vars &= ~AD_PORT_READY;
1da177e4
LT		 644 }
645}
646
647/**
648 * __get_agg_bandwidth - get the total bandwidth of an aggregator
649 * @aggregator: the aggregator we're looking at
650 *
651 */
652static u32 __get_agg_bandwidth(struct aggregator *aggregator)
653{
128ea6c3 654 u32 bandwidth = 0;
1da177e4
LT		 655
656 if (aggregator->num_of_ports) {
65cce19c 657 switch (__get_link_speed(aggregator->lag_ports)) {
cb8dda90 658 case AD_LINK_SPEED_1MBPS:
1da177e4
LT		 659 bandwidth = aggregator->num_of_ports;
660 break;
cb8dda90 661 case AD_LINK_SPEED_10MBPS:
1da177e4
LT		 662 bandwidth = aggregator->num_of_ports * 10;
663 break;
cb8dda90 664 case AD_LINK_SPEED_100MBPS:
1da177e4
LT		 665 bandwidth = aggregator->num_of_ports * 100;
666 break;
cb8dda90 667 case AD_LINK_SPEED_1000MBPS:
1da177e4
LT		 668 bandwidth = aggregator->num_of_ports * 1000;
669 break;
424c3232
JX		 670 case AD_LINK_SPEED_2500MBPS:
671 bandwidth = aggregator->num_of_ports * 2500;
672 break;
cb8dda90 673 case AD_LINK_SPEED_10000MBPS:
94dbffd5
JV		 674 bandwidth = aggregator->num_of_ports * 10000;
675 break;
424c3232
JX		 676 case AD_LINK_SPEED_20000MBPS:
677 bandwidth = aggregator->num_of_ports * 20000;
678 break;
679 case AD_LINK_SPEED_40000MBPS:
680 bandwidth = aggregator->num_of_ports * 40000;
681 break;
682 case AD_LINK_SPEED_56000MBPS:
683 bandwidth = aggregator->num_of_ports * 56000;
684 break;
1da177e4 685 default:
3bf2d28a 686 bandwidth = 0; /* to silence the compiler */
1da177e4
LT		 687 }
688 }
689 return bandwidth;
690}
691
692/**
693 * __get_active_agg - get the current active aggregator
694 * @aggregator: the aggregator we're looking at
49b7624e
VF		 695 *
696 * Caller must hold RCU lock.
1da177e4
LT		 697 */
698static struct aggregator *__get_active_agg(struct aggregator *aggregator)
699{
19177e7d
VF		 700 struct bonding *bond = aggregator->slave->bond;
701 struct list_head *iter;
702 struct slave *slave;
1da177e4 703
be79bd04 704 bond_for_each_slave_rcu(bond, slave, iter)
3fdddd85 705 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
706 return &(SLAVE_AD_INFO(slave)->aggregator);
1da177e4 707
19177e7d 708 return NULL;
1da177e4
LT		 709}
710
711/**
712 * __update_lacpdu_from_port - update a port's lacpdu fields
713 * @port: the port we're looking at
1da177e4
LT		 714 */
715static inline void __update_lacpdu_from_port(struct port *port)
716{
717 struct lacpdu *lacpdu = &port->lacpdu;
3b5b35d0 718 const struct port_params *partner = &port->partner_oper;
1da177e4 719
3bf2d28a
VF		 720 /* update current actual Actor parameters
721 * lacpdu->subtype initialized
1da177e4
LT		 722 * lacpdu->version_number initialized
723 * lacpdu->tlv_type_actor_info initialized
724 * lacpdu->actor_information_length initialized
725 */
726
d3bb52b0 727 lacpdu->actor_system_priority = htons(port->actor_system_priority);
1da177e4 728 lacpdu->actor_system = port->actor_system;
d3bb52b0
AV		 729 lacpdu->actor_key = htons(port->actor_oper_port_key);
730 lacpdu->actor_port_priority = htons(port->actor_port_priority);
731 lacpdu->actor_port = htons(port->actor_port_number);
1da177e4 732 lacpdu->actor_state = port->actor_oper_port_state;
63b46242
WK		 733 pr_debug("update lacpdu: %s, actor port state %x\n",
734 port->slave->dev->name, port->actor_oper_port_state);
1da177e4
LT		 735
736 /* lacpdu->reserved_3_1 initialized
737 * lacpdu->tlv_type_partner_info initialized
738 * lacpdu->partner_information_length initialized
739 */
740
3b5b35d0
HE		 741 lacpdu->partner_system_priority = htons(partner->system_priority);
742 lacpdu->partner_system = partner->system;
743 lacpdu->partner_key = htons(partner->key);
744 lacpdu->partner_port_priority = htons(partner->port_priority);
745 lacpdu->partner_port = htons(partner->port_number);
746 lacpdu->partner_state = partner->port_state;
1da177e4
LT		 747
748 /* lacpdu->reserved_3_2 initialized
749 * lacpdu->tlv_type_collector_info initialized
750 * lacpdu->collector_information_length initialized
751 * collector_max_delay initialized
752 * reserved_12[12] initialized
753 * tlv_type_terminator initialized
754 * terminator_length initialized
755 * reserved_50[50] initialized
756 */
1da177e4
LT		 757}
758
3bf2d28a 759/* ================= main 802.3ad protocol code ========================= */
1da177e4
LT		 760
761/**
762 * ad_lacpdu_send - send out a lacpdu packet on a given port
763 * @port: the port we're looking at
764 *
765 * Returns: 0 on success
766 * < 0 on error
767 */
768static int ad_lacpdu_send(struct port *port)
769{
770 struct slave *slave = port->slave;
771 struct sk_buff *skb;
772 struct lacpdu_header *lacpdu_header;
773 int length = sizeof(struct lacpdu_header);
1da177e4
LT		 774
775 skb = dev_alloc_skb(length);
7bfc4753 776 if (!skb)
1da177e4 777 return -ENOMEM;
1da177e4
LT		 778
779 skb->dev = slave->dev;
459a98ed 780 skb_reset_mac_header(skb);
b0e380b1 781 skb->network_header = skb->mac_header + ETH_HLEN;
1da177e4
LT		 782 skb->protocol = PKT_TYPE_LACPDU;
783 skb->priority = TC_PRIO_CONTROL;
784
785 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
786
ada0f863 787 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
b595076a 788 /* Note: source address is set to be the member's PERMANENT address,
3bf2d28a
VF		 789 * because we use it to identify loopback lacpdus in receive.
790 */
ada0f863 791 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
e727149e 792 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
1da177e4 793
3bf2d28a 794 lacpdu_header->lacpdu = port->lacpdu;
1da177e4
LT		 795
796 dev_queue_xmit(skb);
797
798 return 0;
799}
800
801/**
802 * ad_marker_send - send marker information/response on a given port
803 * @port: the port we're looking at
804 * @marker: marker data to send
805 *
806 * Returns: 0 on success
807 * < 0 on error
808 */
1c3f0b8e 809static int ad_marker_send(struct port *port, struct bond_marker *marker)
1da177e4
LT		 810{
811 struct slave *slave = port->slave;
812 struct sk_buff *skb;
1c3f0b8e
MD		 813 struct bond_marker_header *marker_header;
814 int length = sizeof(struct bond_marker_header);
1da177e4
LT		 815
816 skb = dev_alloc_skb(length + 16);
7bfc4753 817 if (!skb)
1da177e4 818 return -ENOMEM;
1da177e4
LT		 819
820 skb_reserve(skb, 16);
821
822 skb->dev = slave->dev;
459a98ed 823 skb_reset_mac_header(skb);
b0e380b1 824 skb->network_header = skb->mac_header + ETH_HLEN;
1da177e4
LT		 825 skb->protocol = PKT_TYPE_LACPDU;
826
1c3f0b8e 827 marker_header = (struct bond_marker_header *)skb_put(skb, length);
1da177e4 828
ada0f863 829 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
b595076a 830 /* Note: source address is set to be the member's PERMANENT address,
3bf2d28a
VF		 831 * because we use it to identify loopback MARKERs in receive.
832 */
ada0f863 833 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
e727149e 834 marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
1da177e4 835
3bf2d28a 836 marker_header->marker = *marker;
1da177e4
LT		 837
838 dev_queue_xmit(skb);
839
840 return 0;
841}
842
843/**
844 * ad_mux_machine - handle a port's mux state machine
845 * @port: the port we're looking at
ee637714 846 * @update_slave_arr: Does slave array need update?
1da177e4 847 */
ee637714 848static void ad_mux_machine(struct port *port, bool *update_slave_arr)
1da177e4
LT		 849{
850 mux_states_t last_state;
851
3bf2d28a
VF		 852 /* keep current State Machine state to compare later if it was
853 * changed
854 */
1da177e4
LT		 855 last_state = port->sm_mux_state;
856
857 if (port->sm_vars & AD_PORT_BEGIN) {
3bf2d28a 858 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 859 } else {
860 switch (port->sm_mux_state) {
861 case AD_MUX_DETACHED:
7bfc4753
BD		 862 if ((port->sm_vars & AD_PORT_SELECTED)
863 || (port->sm_vars & AD_PORT_STANDBY))
864 /* if SELECTED or STANDBY */
3bf2d28a 865 port->sm_mux_state = AD_MUX_WAITING;
1da177e4
LT		 866 break;
867 case AD_MUX_WAITING:
3bf2d28a
VF		 868 /* if SELECTED == FALSE return to DETACH state */
869 if (!(port->sm_vars & AD_PORT_SELECTED)) {
1da177e4 870 port->sm_vars &= ~AD_PORT_READY_N;
3bf2d28a
VF		 871 /* in order to withhold the Selection Logic to
872 * check all ports READY_N value every callback
873 * cycle to update ready variable, we check
874 * READY_N and update READY here
875 */
1da177e4 876 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
3bf2d28a 877 port->sm_mux_state = AD_MUX_DETACHED;
1da177e4
LT		 878 break;
879 }
880
3bf2d28a 881 /* check if the wait_while_timer expired */
7bfc4753
BD		 882 if (port->sm_mux_timer_counter
883 && !(--port->sm_mux_timer_counter))
1da177e4 884 port->sm_vars |= AD_PORT_READY_N;
1da177e4 885
3bf2d28a
VF		 886 /* in order to withhold the selection logic to check
887 * all ports READY_N value every callback cycle to
888 * update ready variable, we check READY_N and update
889 * READY here
890 */
1da177e4
LT		 891 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
892
3bf2d28a
VF		 893 /* if the wait_while_timer expired, and the port is
894 * in READY state, move to ATTACHED state
895 */
7bfc4753
BD		 896 if ((port->sm_vars & AD_PORT_READY)
897 && !port->sm_mux_timer_counter)
3bf2d28a 898 port->sm_mux_state = AD_MUX_ATTACHED;
1da177e4
LT		 899 break;
900 case AD_MUX_ATTACHED:
3bf2d28a
VF		 901 /* check also if agg_select_timer expired (so the
902 * edable port will take place only after this timer)
903 */
904 if ((port->sm_vars & AD_PORT_SELECTED) &&
905 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
906 !__check_agg_selection_timer(port)) {
63b46242
WK		 907 if (port->aggregator->is_active)
908 port->sm_mux_state =
909 AD_MUX_COLLECTING_DISTRIBUTING;
3bf2d28a
VF		 910 } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
911 (port->sm_vars & AD_PORT_STANDBY)) {
912 /* if UNSELECTED or STANDBY */
1da177e4 913 port->sm_vars &= ~AD_PORT_READY_N;
3bf2d28a
VF		 914 /* in order to withhold the selection logic to
915 * check all ports READY_N value every callback
916 * cycle to update ready variable, we check
917 * READY_N and update READY here
918 */
1da177e4 919 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
3bf2d28a 920 port->sm_mux_state = AD_MUX_DETACHED;
63b46242
WK		 921 } else if (port->aggregator->is_active) {
922 port->actor_oper_port_state |=
923 AD_STATE_SYNCHRONIZATION;
1da177e4
LT		 924 }
925 break;
926 case AD_MUX_COLLECTING_DISTRIBUTING:
3bf2d28a
VF		 927 if (!(port->sm_vars & AD_PORT_SELECTED) ||
928 (port->sm_vars & AD_PORT_STANDBY) ||
63b46242
WK		 929 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
930 !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
3bf2d28a 931 port->sm_mux_state = AD_MUX_ATTACHED;
1da177e4 932 } else {
3bf2d28a
VF		 933 /* if port state hasn't changed make
934 * sure that a collecting distributing
935 * port in an active aggregator is enabled
936 */
1da177e4
LT		 937 if (port->aggregator &&
938 port->aggregator->is_active &&
939 !__port_is_enabled(port)) {
940
941 __enable_port(port);
942 }
943 }
944 break;
3bf2d28a 945 default:
1da177e4
LT		 946 break;
947 }
948 }
949
3bf2d28a 950 /* check if the state machine was changed */
1da177e4 951 if (port->sm_mux_state != last_state) {
63b46242
WK		 952 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
953 port->actor_port_number,
954 port->slave->dev->name,
955 last_state,
a4aee5c8 956 port->sm_mux_state);
1da177e4
LT		 957 switch (port->sm_mux_state) {
958 case AD_MUX_DETACHED:
1da177e4 959 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
ee637714
MB		 960 ad_disable_collecting_distributing(port,
961 update_slave_arr);
1da177e4
LT		 962 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
963 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
d238d458 964 port->ntt = true;
1da177e4
LT		 965 break;
966 case AD_MUX_WAITING:
967 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
968 break;
969 case AD_MUX_ATTACHED:
63b46242
WK		 970 if (port->aggregator->is_active)
971 port->actor_oper_port_state |=
972 AD_STATE_SYNCHRONIZATION;
973 else
974 port->actor_oper_port_state &=
975 ~AD_STATE_SYNCHRONIZATION;
1da177e4
LT		 976 port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
977 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
ee637714
MB		 978 ad_disable_collecting_distributing(port,
979 update_slave_arr);
d238d458 980 port->ntt = true;
1da177e4
LT		 981 break;
982 case AD_MUX_COLLECTING_DISTRIBUTING:
983 port->actor_oper_port_state |= AD_STATE_COLLECTING;
984 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
63b46242 985 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
ee637714
MB		 986 ad_enable_collecting_distributing(port,
987 update_slave_arr);
d238d458 988 port->ntt = true;
1da177e4 989 break;
3bf2d28a 990 default:
1da177e4
LT		 991 break;
992 }
993 }
994}
995
996/**
997 * ad_rx_machine - handle a port's rx State Machine
998 * @lacpdu: the lacpdu we've received
999 * @port: the port we're looking at
1000 *
1001 * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1002 * CURRENT. If timer expired set the state machine in the proper state.
1003 * In other cases, this function checks if we need to switch to other state.
1004 */
1005static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1006{
1007 rx_states_t last_state;
1008
3bf2d28a
VF		 1009 /* keep current State Machine state to compare later if it was
1010 * changed
1011 */
1da177e4
LT		 1012 last_state = port->sm_rx_state;
1013
3bf2d28a
VF		 1014 /* check if state machine should change state */
1015
1016 /* first, check if port was reinitialized */
14c9551a 1017 if (port->sm_vars & AD_PORT_BEGIN) {
7bfc4753 1018 port->sm_rx_state = AD_RX_INITIALIZE;
ef015d72 1019 port->sm_vars |= AD_PORT_CHURNED;
3bf2d28a 1020 /* check if port is not enabled */
14c9551a 1021 } else if (!(port->sm_vars & AD_PORT_BEGIN)
7bfc4753 1022 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
7bfc4753 1023 port->sm_rx_state = AD_RX_PORT_DISABLED;
3bf2d28a
VF		 1024 /* check if new lacpdu arrived */
1025 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1026 (port->sm_rx_state == AD_RX_DEFAULTED) ||
1027 (port->sm_rx_state == AD_RX_CURRENT))) {
14c9551a 1028 if (port->sm_rx_state != AD_RX_CURRENT)
ef015d72 1029 port->sm_vars |= AD_PORT_CHURNED;
3bf2d28a 1030 port->sm_rx_timer_counter = 0;
1da177e4
LT		 1031 port->sm_rx_state = AD_RX_CURRENT;
1032 } else {
3bf2d28a
VF		 1033 /* if timer is on, and if it is expired */
1034 if (port->sm_rx_timer_counter &&
1035 !(--port->sm_rx_timer_counter)) {
1da177e4
LT		 1036 switch (port->sm_rx_state) {
1037 case AD_RX_EXPIRED:
3bf2d28a 1038 port->sm_rx_state = AD_RX_DEFAULTED;
1da177e4
LT		 1039 break;
1040 case AD_RX_CURRENT:
3bf2d28a 1041 port->sm_rx_state = AD_RX_EXPIRED;
1da177e4 1042 break;
3bf2d28a 1043 default:
1da177e4
LT		 1044 break;
1045 }
1046 } else {
3bf2d28a 1047 /* if no lacpdu arrived and no timer is on */
1da177e4
LT		 1048 switch (port->sm_rx_state) {
1049 case AD_RX_PORT_DISABLED:
7bfc4753 1050 if (port->sm_vars & AD_PORT_MOVED)
3bf2d28a 1051 port->sm_rx_state = AD_RX_INITIALIZE;
7bfc4753
BD		 1052 else if (port->is_enabled
1053 && (port->sm_vars
1054 & AD_PORT_LACP_ENABLED))
3bf2d28a 1055 port->sm_rx_state = AD_RX_EXPIRED;
7bfc4753
BD		 1056 else if (port->is_enabled
1057 && ((port->sm_vars
1058 & AD_PORT_LACP_ENABLED) == 0))
3bf2d28a 1059 port->sm_rx_state = AD_RX_LACP_DISABLED;
1da177e4 1060 break;
3bf2d28a 1061 default:
1da177e4
LT		 1062 break;
1063
1064 }
1065 }
1066 }
1067
3bf2d28a 1068 /* check if the State machine was changed or new lacpdu arrived */
1da177e4 1069 if ((port->sm_rx_state != last_state) || (lacpdu)) {
63b46242
WK		 1070 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1071 port->actor_port_number,
1072 port->slave->dev->name,
1073 last_state,
a4aee5c8 1074 port->sm_rx_state);
1da177e4
LT		 1075 switch (port->sm_rx_state) {
1076 case AD_RX_INITIALIZE:
cb8dda90 1077 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1da177e4 1078 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
7bfc4753 1079 else
1da177e4 1080 port->sm_vars |= AD_PORT_LACP_ENABLED;
1da177e4
LT		 1081 port->sm_vars &= ~AD_PORT_SELECTED;
1082 __record_default(port);
1083 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1084 port->sm_vars &= ~AD_PORT_MOVED;
3bf2d28a 1085 port->sm_rx_state = AD_RX_PORT_DISABLED;
1da177e4 1086
3bf2d28a 1087 /* Fall Through */
1da177e4
LT		 1088 case AD_RX_PORT_DISABLED:
1089 port->sm_vars &= ~AD_PORT_MATCHED;
1090 break;
1091 case AD_RX_LACP_DISABLED:
1092 port->sm_vars &= ~AD_PORT_SELECTED;
1093 __record_default(port);
1055c9ab 1094 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1da177e4
LT		 1095 port->sm_vars |= AD_PORT_MATCHED;
1096 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1097 break;
1098 case AD_RX_EXPIRED:
3bf2d28a
VF		 1099 /* Reset of the Synchronization flag (Standard 43.4.12)
1100 * This reset cause to disable this port in the
1101 * COLLECTING_DISTRIBUTING state of the mux machine in
1102 * case of EXPIRED even if LINK_DOWN didn't arrive for
1103 * the port.
1104 */
1055c9ab 1105 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1da177e4 1106 port->sm_vars &= ~AD_PORT_MATCHED;
14c9551a 1107 port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
3bf2d28a 1108 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1da177e4
LT		 1109 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1110 port->actor_oper_port_state |= AD_STATE_EXPIRED;
ef015d72 1111 port->sm_vars |= AD_PORT_CHURNED;
1da177e4
LT		 1112 break;
1113 case AD_RX_DEFAULTED:
1114 __update_default_selected(port);
1115 __record_default(port);
1116 port->sm_vars |= AD_PORT_MATCHED;
1117 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1118 break;
1119 case AD_RX_CURRENT:
815117ad 1120 /* detect loopback situation */
3bf2d28a
VF		 1121 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1122 &(port->actor_system))) {
d4471f5e 1123 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
90194264 1124 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
3bf2d28a 1125 port->slave->dev->name);
1da177e4
LT		 1126 return;
1127 }
1128 __update_selected(lacpdu, port);
1129 __update_ntt(lacpdu, port);
1130 __record_pdu(lacpdu, port);
1da177e4
LT		 1131 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1132 port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1da177e4 1133 break;
3bf2d28a 1134 default:
1da177e4
LT		 1135 break;
1136 }
1137 }
1da177e4
LT		 1138}
1139
14c9551a
MB		 1140/**
1141 * ad_churn_machine - handle port churn's state machine
1142 * @port: the port we're looking at
1143 *
1144 */
1145static void ad_churn_machine(struct port *port)
1146{
ef015d72
MB		 1147 if (port->sm_vars & AD_PORT_CHURNED) {
1148 port->sm_vars &= ~AD_PORT_CHURNED;
14c9551a
MB		 1149 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1150 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1151 port->sm_churn_actor_timer_counter =
1152 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1153 port->sm_churn_partner_timer_counter =
1154 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1155 return;
1156 }
1157 if (port->sm_churn_actor_timer_counter &&
1158 !(--port->sm_churn_actor_timer_counter) &&
1159 port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1160 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1161 port->sm_churn_actor_state = AD_NO_CHURN;
1162 } else {
1163 port->churn_actor_count++;
1164 port->sm_churn_actor_state = AD_CHURN;
1165 }
1166 }
1167 if (port->sm_churn_partner_timer_counter &&
1168 !(--port->sm_churn_partner_timer_counter) &&
1169 port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1170 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1171 port->sm_churn_partner_state = AD_NO_CHURN;
1172 } else {
1173 port->churn_partner_count++;
1174 port->sm_churn_partner_state = AD_CHURN;
1175 }
1176 }
1177}
1178
1da177e4
LT		 1179/**
1180 * ad_tx_machine - handle a port's tx state machine
1181 * @port: the port we're looking at
1da177e4
LT		 1182 */
1183static void ad_tx_machine(struct port *port)
1184{
3bf2d28a
VF		 1185 /* check if tx timer expired, to verify that we do not send more than
1186 * 3 packets per second
1187 */
1da177e4 1188 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
3bf2d28a 1189 /* check if there is something to send */
1da177e4
LT		 1190 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1191 __update_lacpdu_from_port(port);
d238d458 1192
1da177e4 1193 if (ad_lacpdu_send(port) >= 0) {
a4aee5c8
JP		 1194 pr_debug("Sent LACPDU on port %d\n",
1195 port->actor_port_number);
d238d458 1196
3bf2d28a
VF		 1197 /* mark ntt as false, so it will not be sent
1198 * again until demanded
1199 */
d238d458 1200 port->ntt = false;
1da177e4
LT		 1201 }
1202 }
3bf2d28a
VF		 1203 /* restart tx timer(to verify that we will not exceed
1204 * AD_MAX_TX_IN_SECOND
1205 */
1206 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1da177e4
LT		 1207 }
1208}
1209
1210/**
1211 * ad_periodic_machine - handle a port's periodic state machine
1212 * @port: the port we're looking at
1213 *
1214 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1215 */
1216static void ad_periodic_machine(struct port *port)
1217{
1218 periodic_states_t last_state;
1219
3bf2d28a 1220 /* keep current state machine state to compare later if it was changed */
1da177e4
LT		 1221 last_state = port->sm_periodic_state;
1222
3bf2d28a 1223 /* check if port was reinitialized */
1da177e4 1224 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1055c9ab 1225 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1da177e4 1226 ) {
3bf2d28a 1227 port->sm_periodic_state = AD_NO_PERIODIC;
1da177e4 1228 }
3bf2d28a 1229 /* check if state machine should change state */
1da177e4 1230 else if (port->sm_periodic_timer_counter) {
3bf2d28a 1231 /* check if periodic state machine expired */
1da177e4 1232 if (!(--port->sm_periodic_timer_counter)) {
3bf2d28a
VF		 1233 /* if expired then do tx */
1234 port->sm_periodic_state = AD_PERIODIC_TX;
1da177e4 1235 } else {
3bf2d28a
VF		 1236 /* If not expired, check if there is some new timeout
1237 * parameter from the partner state
1238 */
1da177e4
LT		 1239 switch (port->sm_periodic_state) {
1240 case AD_FAST_PERIODIC:
7bfc4753
BD		 1241 if (!(port->partner_oper.port_state
1242 & AD_STATE_LACP_TIMEOUT))
3bf2d28a 1243 port->sm_periodic_state = AD_SLOW_PERIODIC;
1da177e4
LT		 1244 break;
1245 case AD_SLOW_PERIODIC:
1055c9ab 1246 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1da177e4 1247 port->sm_periodic_timer_counter = 0;
3bf2d28a 1248 port->sm_periodic_state = AD_PERIODIC_TX;
1da177e4
LT		 1249 }
1250 break;
3bf2d28a 1251 default:
1da177e4
LT		 1252 break;
1253 }
1254 }
1255 } else {
1256 switch (port->sm_periodic_state) {
1257 case AD_NO_PERIODIC:
3bf2d28a 1258 port->sm_periodic_state = AD_FAST_PERIODIC;
1da177e4
LT		 1259 break;
1260 case AD_PERIODIC_TX:
3bf2d28a
VF		 1261 if (!(port->partner_oper.port_state &
1262 AD_STATE_LACP_TIMEOUT))
1263 port->sm_periodic_state = AD_SLOW_PERIODIC;
7bfc4753 1264 else
3bf2d28a 1265 port->sm_periodic_state = AD_FAST_PERIODIC;
1da177e4 1266 break;
3bf2d28a 1267 default:
1da177e4
LT		 1268 break;
1269 }
1270 }
1271
3bf2d28a 1272 /* check if the state machine was changed */
1da177e4 1273 if (port->sm_periodic_state != last_state) {
a4aee5c8
JP		 1274 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1275 port->actor_port_number, last_state,
1276 port->sm_periodic_state);
1da177e4
LT		 1277 switch (port->sm_periodic_state) {
1278 case AD_NO_PERIODIC:
3bf2d28a 1279 port->sm_periodic_timer_counter = 0;
1da177e4
LT		 1280 break;
1281 case AD_FAST_PERIODIC:
3bf2d28a
VF		 1282 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1283 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1da177e4
LT		 1284 break;
1285 case AD_SLOW_PERIODIC:
3bf2d28a
VF		 1286 /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1287 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1da177e4
LT		 1288 break;
1289 case AD_PERIODIC_TX:
d238d458 1290 port->ntt = true;
1da177e4 1291 break;
3bf2d28a 1292 default:
1da177e4
LT		 1293 break;
1294 }
1295 }
1296}
1297
1298/**
1299 * ad_port_selection_logic - select aggregation groups
1300 * @port: the port we're looking at
ee637714 1301 * @update_slave_arr: Does slave array need update?
1da177e4
LT		 1302 *
1303 * Select aggregation groups, and assign each port for it's aggregetor. The
1304 * selection logic is called in the inititalization (after all the handshkes),
1305 * and after every lacpdu receive (if selected is off).
1306 */
ee637714 1307static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1da177e4
LT		 1308{
1309 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1310 struct port *last_port = NULL, *curr_port;
3e36bb75
VF		 1311 struct list_head *iter;
1312 struct bonding *bond;
1313 struct slave *slave;
1da177e4
LT		 1314 int found = 0;
1315
3bf2d28a 1316 /* if the port is already Selected, do nothing */
7bfc4753 1317 if (port->sm_vars & AD_PORT_SELECTED)
1da177e4 1318 return;
1da177e4 1319
3e36bb75
VF		 1320 bond = __get_bond_by_port(port);
1321
3bf2d28a 1322 /* if the port is connected to other aggregator, detach it */
1da177e4 1323 if (port->aggregator) {
3bf2d28a 1324 /* detach the port from its former aggregator */
128ea6c3
BD		 1325 temp_aggregator = port->aggregator;
1326 for (curr_port = temp_aggregator->lag_ports; curr_port;
1327 last_port = curr_port,
3bf2d28a 1328 curr_port = curr_port->next_port_in_aggregator) {
1da177e4
LT		 1329 if (curr_port == port) {
1330 temp_aggregator->num_of_ports--;
3bf2d28a
VF		 1331 /* if it is the first port attached to the
1332 * aggregator
1333 */
1334 if (!last_port) {
128ea6c3
BD		 1335 temp_aggregator->lag_ports =
1336 port->next_port_in_aggregator;
3bf2d28a
VF		 1337 } else {
1338 /* not the first port attached to the
1339 * aggregator
1340 */
128ea6c3
BD		 1341 last_port->next_port_in_aggregator =
1342 port->next_port_in_aggregator;
1da177e4
LT		 1343 }
1344
3bf2d28a
VF		 1345 /* clear the port's relations to this
1346 * aggregator
1347 */
1da177e4 1348 port->aggregator = NULL;
128ea6c3
BD		 1349 port->next_port_in_aggregator = NULL;
1350 port->actor_port_aggregator_identifier = 0;
1da177e4 1351
d4471f5e
VF		 1352 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1353 port->actor_port_number,
1354 temp_aggregator->aggregator_identifier);
3bf2d28a
VF		 1355 /* if the aggregator is empty, clear its
1356 * parameters, and set it ready to be attached
1357 */
7bfc4753 1358 if (!temp_aggregator->lag_ports)
1da177e4 1359 ad_clear_agg(temp_aggregator);
1da177e4
LT		 1360 break;
1361 }
1362 }
3bf2d28a
VF		 1363 if (!curr_port) {
1364 /* meaning: the port was related to an aggregator
1365 * but was not on the aggregator port list
1366 */
d4471f5e
VF		 1367 net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1368 port->slave->bond->dev->name,
1369 port->actor_port_number,
1370 port->slave->dev->name,
1371 port->aggregator->aggregator_identifier);
1da177e4
LT		 1372 }
1373 }
3bf2d28a 1374 /* search on all aggregators for a suitable aggregator for this port */
3e36bb75 1375 bond_for_each_slave(bond, slave, iter) {
3fdddd85 1376 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1da177e4 1377
3bf2d28a 1378 /* keep a free aggregator for later use(if needed) */
1da177e4 1379 if (!aggregator->lag_ports) {
7bfc4753 1380 if (!free_aggregator)
128ea6c3 1381 free_aggregator = aggregator;
1da177e4
LT		 1382 continue;
1383 }
815117ad 1384 /* check if current aggregator suits us */
1385 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1386 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1055c9ab
HE		 1387 (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1388 (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1da177e4 1389 ) &&
815117ad 1390 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1391 !aggregator->is_individual) /* but is not individual OR */
1da177e4
LT		 1392 )
1393 ) {
815117ad 1394 /* attach to the founded aggregator */
1da177e4 1395 port->aggregator = aggregator;
128ea6c3
BD		 1396 port->actor_port_aggregator_identifier =
1397 port->aggregator->aggregator_identifier;
1398 port->next_port_in_aggregator = aggregator->lag_ports;
1da177e4 1399 port->aggregator->num_of_ports++;
128ea6c3 1400 aggregator->lag_ports = port;
d4471f5e
VF		 1401 netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1402 port->actor_port_number,
1403 port->aggregator->aggregator_identifier);
1da177e4 1404
3bf2d28a 1405 /* mark this port as selected */
1da177e4
LT		 1406 port->sm_vars |= AD_PORT_SELECTED;
1407 found = 1;
1408 break;
1409 }
1410 }
1411
3bf2d28a
VF		 1412 /* the port couldn't find an aggregator - attach it to a new
1413 * aggregator
1414 */
1da177e4
LT		 1415 if (!found) {
1416 if (free_aggregator) {
3bf2d28a 1417 /* assign port a new aggregator */
1da177e4 1418 port->aggregator = free_aggregator;
128ea6c3
BD		 1419 port->actor_port_aggregator_identifier =
1420 port->aggregator->aggregator_identifier;
1da177e4 1421
3bf2d28a
VF		 1422 /* update the new aggregator's parameters
1423 * if port was responsed from the end-user
1424 */
cb8dda90 1425 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
7bfc4753 1426 /* if port is full duplex */
1624db7b 1427 port->aggregator->is_individual = false;
7bfc4753 1428 else
1624db7b 1429 port->aggregator->is_individual = true;
1da177e4 1430
c3cd9ee1
MB		 1431 port->aggregator->actor_admin_aggregator_key =
1432 port->actor_admin_port_key;
1433 port->aggregator->actor_oper_aggregator_key =
1434 port->actor_oper_port_key;
128ea6c3
BD		 1435 port->aggregator->partner_system =
1436 port->partner_oper.system;
1437 port->aggregator->partner_system_priority =
1438 port->partner_oper.system_priority;
1055c9ab 1439 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1da177e4
LT		 1440 port->aggregator->receive_state = 1;
1441 port->aggregator->transmit_state = 1;
1442 port->aggregator->lag_ports = port;
1443 port->aggregator->num_of_ports++;
1444
3bf2d28a 1445 /* mark this port as selected */
1da177e4
LT		 1446 port->sm_vars |= AD_PORT_SELECTED;
1447
d4471f5e
VF		 1448 netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1449 port->actor_port_number,
1450 port->aggregator->aggregator_identifier);
1da177e4 1451 } else {
d4471f5e 1452 netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1da177e4
LT		 1453 port->actor_port_number, port->slave->dev->name);
1454 }
1455 }
3bf2d28a
VF		 1456 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1457 * in all aggregator's ports, else set ready=FALSE in all
1458 * aggregator's ports
1459 */
1460 __set_agg_ports_ready(port->aggregator,
1461 __agg_ports_are_ready(port->aggregator));
1da177e4 1462
fd989c83 1463 aggregator = __get_first_agg(port);
ee637714 1464 ad_agg_selection_logic(aggregator, update_slave_arr);
63b46242
WK		 1465
1466 if (!port->aggregator->is_active)
1467 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
fd989c83
JV		 1468}
1469
3bf2d28a 1470/* Decide if "agg" is a better choice for the new active aggregator that
fd989c83
JV		 1471 * the current best, according to the ad_select policy.
1472 */
1473static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1474 struct aggregator *curr)
1475{
3bf2d28a 1476 /* 0. If no best, select current.
fd989c83
JV		 1477 *
1478 * 1. If the current agg is not individual, and the best is
1479 * individual, select current.
1480 *
1481 * 2. If current agg is individual and the best is not, keep best.
1482 *
1483 * 3. Therefore, current and best are both individual or both not
1484 * individual, so:
1485 *
1486 * 3a. If current agg partner replied, and best agg partner did not,
1487 * select current.
1488 *
1489 * 3b. If current agg partner did not reply and best agg partner
1490 * did reply, keep best.
1491 *
1492 * 4. Therefore, current and best both have partner replies or
1493 * both do not, so perform selection policy:
1494 *
1495 * BOND_AD_COUNT: Select by count of ports. If count is equal,
1496 * select by bandwidth.
1497 *
1498 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1499 */
1500 if (!best)
1501 return curr;
1502
1503 if (!curr->is_individual && best->is_individual)
1504 return curr;
1505
1506 if (curr->is_individual && !best->is_individual)
1507 return best;
1508
1509 if (__agg_has_partner(curr) && !__agg_has_partner(best))
1510 return curr;
1511
1512 if (!__agg_has_partner(curr) && __agg_has_partner(best))
1513 return best;
1514
1515 switch (__get_agg_selection_mode(curr->lag_ports)) {
1516 case BOND_AD_COUNT:
1517 if (curr->num_of_ports > best->num_of_ports)
1518 return curr;
1519
1520 if (curr->num_of_ports < best->num_of_ports)
1521 return best;
1522
1523 /*FALLTHROUGH*/
1524 case BOND_AD_STABLE:
1525 case BOND_AD_BANDWIDTH:
1526 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1527 return curr;
1528
1529 break;
1530
1531 default:
d4471f5e
VF		 1532 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1533 curr->slave->bond->dev->name,
1534 __get_agg_selection_mode(curr->lag_ports));
fd989c83 1535 break;
1da177e4 1536 }
fd989c83
JV		 1537
1538 return best;
1da177e4
LT		 1539}
1540
4cd6fe1c
SH		 1541static int agg_device_up(const struct aggregator *agg)
1542{
2430af8b 1543 struct port *port = agg->lag_ports;
3bf2d28a 1544
2430af8b
JB		 1545 if (!port)
1546 return 0;
3bf2d28a
VF		 1547
1548 return netif_running(port->slave->dev) &&
1549 netif_carrier_ok(port->slave->dev);
4cd6fe1c
SH		 1550}
1551
1da177e4
LT		 1552/**
1553 * ad_agg_selection_logic - select an aggregation group for a team
1554 * @aggregator: the aggregator we're looking at
ee637714 1555 * @update_slave_arr: Does slave array need update?
1da177e4
LT		 1556 *
1557 * It is assumed that only one aggregator may be selected for a team.
fd989c83
JV		 1558 *
1559 * The logic of this function is to select the aggregator according to
1560 * the ad_select policy:
1561 *
1562 * BOND_AD_STABLE: select the aggregator with the most ports attached to
1563 * it, and to reselect the active aggregator only if the previous
1564 * aggregator has no more ports related to it.
1565 *
1566 * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1567 * bandwidth, and reselect whenever a link state change takes place or the
1568 * set of slaves in the bond changes.
1569 *
1570 * BOND_AD_COUNT: select the aggregator with largest number of ports
1571 * (slaves), and reselect whenever a link state change takes place or the
1572 * set of slaves in the bond changes.
1da177e4
LT		 1573 *
1574 * FIXME: this function MUST be called with the first agg in the bond, or
1575 * __get_active_agg() won't work correctly. This function should be better
1576 * called with the bond itself, and retrieve the first agg from it.
1577 */
ee637714
MB		 1578static void ad_agg_selection_logic(struct aggregator *agg,
1579 bool *update_slave_arr)
1da177e4 1580{
fd989c83 1581 struct aggregator *best, *active, *origin;
bef1fcce
VF		 1582 struct bonding *bond = agg->slave->bond;
1583 struct list_head *iter;
1584 struct slave *slave;
1da177e4 1585 struct port *port;
1da177e4 1586
49b7624e 1587 rcu_read_lock();
fd989c83 1588 origin = agg;
fd989c83 1589 active = __get_active_agg(agg);
4cd6fe1c 1590 best = (active && agg_device_up(active)) ? active : NULL;
1da177e4 1591
be79bd04 1592 bond_for_each_slave_rcu(bond, slave, iter) {
3fdddd85 1593 agg = &(SLAVE_AD_INFO(slave)->aggregator);
bef1fcce 1594
fd989c83
JV		 1595 agg->is_active = 0;
1596
4cd6fe1c 1597 if (agg->num_of_ports && agg_device_up(agg))
fd989c83 1598 best = ad_agg_selection_test(best, agg);
bef1fcce 1599 }
fd989c83
JV		 1600
1601 if (best &&
1602 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
3bf2d28a 1603 /* For the STABLE policy, don't replace the old active
fd989c83
JV		 1604 * aggregator if it's still active (it has an answering
1605 * partner) or if both the best and active don't have an
1606 * answering partner.
1607 */
1608 if (active && active->lag_ports &&
1609 active->lag_ports->is_enabled &&
1610 (__agg_has_partner(active) ||
3bf2d28a
VF		 1611 (!__agg_has_partner(active) &&
1612 !__agg_has_partner(best)))) {
fd989c83
JV		 1613 if (!(!active->actor_oper_aggregator_key &&
1614 best->actor_oper_aggregator_key)) {
1615 best = NULL;
1616 active->is_active = 1;
1da177e4
LT		 1617 }
1618 }
fd989c83 1619 }
1da177e4 1620
fd989c83
JV		 1621 if (best && (best == active)) {
1622 best = NULL;
1623 active->is_active = 1;
1da177e4
LT		 1624 }
1625
be79bd04 1626 /* if there is new best aggregator, activate it */
fd989c83 1627 if (best) {
d4471f5e
VF		 1628 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1629 best->aggregator_identifier, best->num_of_ports,
1630 best->actor_oper_aggregator_key,
1631 best->partner_oper_aggregator_key,
1632 best->is_individual, best->is_active);
1633 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1634 best->lag_ports, best->slave,
1635 best->slave ? best->slave->dev->name : "NULL");
fd989c83 1636
be79bd04 1637 bond_for_each_slave_rcu(bond, slave, iter) {
3fdddd85 1638 agg = &(SLAVE_AD_INFO(slave)->aggregator);
fd989c83 1639
d4471f5e
VF		 1640 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1641 agg->aggregator_identifier, agg->num_of_ports,
1642 agg->actor_oper_aggregator_key,
1643 agg->partner_oper_aggregator_key,
1644 agg->is_individual, agg->is_active);
1da177e4
LT		 1645 }
1646
be79bd04 1647 /* check if any partner replys */
fd989c83 1648 if (best->is_individual) {
d4471f5e
VF		 1649 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1650 best->slave ?
1651 best->slave->bond->dev->name : "NULL");
1da177e4
LT		 1652 }
1653
fd989c83 1654 best->is_active = 1;
d4471f5e
VF		 1655 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1656 best->aggregator_identifier);
1657 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1658 best->aggregator_identifier, best->num_of_ports,
1659 best->actor_oper_aggregator_key,
1660 best->partner_oper_aggregator_key,
1661 best->is_individual, best->is_active);
1da177e4 1662
3bf2d28a
VF		 1663 /* disable the ports that were related to the former
1664 * active_aggregator
1665 */
fd989c83
JV		 1666 if (active) {
1667 for (port = active->lag_ports; port;
1668 port = port->next_port_in_aggregator) {
1da177e4
LT		 1669 __disable_port(port);
1670 }
1671 }
ee637714
MB		 1672 /* Slave array needs update. */
1673 *update_slave_arr = true;
1da177e4
LT		 1674 }
1675
3bf2d28a 1676 /* if the selected aggregator is of join individuals
fd989c83
JV		 1677 * (partner_system is NULL), enable their ports
1678 */
1679 active = __get_active_agg(origin);
1da177e4 1680
fd989c83
JV		 1681 if (active) {
1682 if (!__agg_has_partner(active)) {
1683 for (port = active->lag_ports; port;
1684 port = port->next_port_in_aggregator) {
1da177e4
LT		 1685 __enable_port(port);
1686 }
1687 }
1688 }
fd989c83 1689
be79bd04 1690 rcu_read_unlock();
1691
bef1fcce 1692 bond_3ad_set_carrier(bond);
1da177e4
LT		 1693}
1694
1695/**
1696 * ad_clear_agg - clear a given aggregator's parameters
1697 * @aggregator: the aggregator we're looking at
1da177e4
LT		 1698 */
1699static void ad_clear_agg(struct aggregator *aggregator)
1700{
1701 if (aggregator) {
1624db7b 1702 aggregator->is_individual = false;
1da177e4
LT		 1703 aggregator->actor_admin_aggregator_key = 0;
1704 aggregator->actor_oper_aggregator_key = 0;
1705 aggregator->partner_system = null_mac_addr;
1706 aggregator->partner_system_priority = 0;
1707 aggregator->partner_oper_aggregator_key = 0;
1708 aggregator->receive_state = 0;
1709 aggregator->transmit_state = 0;
1710 aggregator->lag_ports = NULL;
1711 aggregator->is_active = 0;
1712 aggregator->num_of_ports = 0;
a4aee5c8
JP		 1713 pr_debug("LAG %d was cleared\n",
1714 aggregator->aggregator_identifier);
1da177e4
LT		 1715 }
1716}
1717
1718/**
1719 * ad_initialize_agg - initialize a given aggregator's parameters
1720 * @aggregator: the aggregator we're looking at
1da177e4
LT		 1721 */
1722static void ad_initialize_agg(struct aggregator *aggregator)
1723{
1724 if (aggregator) {
1725 ad_clear_agg(aggregator);
1726
1727 aggregator->aggregator_mac_address = null_mac_addr;
1728 aggregator->aggregator_identifier = 0;
1729 aggregator->slave = NULL;
1730 }
1731}
1732
1733/**
1734 * ad_initialize_port - initialize a given port's parameters
1735 * @aggregator: the aggregator we're looking at
1736 * @lacp_fast: boolean. whether fast periodic should be used
1da177e4
LT		 1737 */
1738static void ad_initialize_port(struct port *port, int lacp_fast)
1739{
c7e703d0
HE		 1740 static const struct port_params tmpl = {
1741 .system_priority = 0xffff,
1742 .key = 1,
1743 .port_number = 1,
1744 .port_priority = 0xff,
1745 .port_state = 1,
1746 };
7addeef6
HE		 1747 static const struct lacpdu lacpdu = {
1748 .subtype = 0x01,
1749 .version_number = 0x01,
1750 .tlv_type_actor_info = 0x01,
1751 .actor_information_length = 0x14,
1752 .tlv_type_partner_info = 0x02,
1753 .partner_information_length = 0x14,
1754 .tlv_type_collector_info = 0x03,
1755 .collector_information_length = 0x10,
1756 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1757 };
c7e703d0 1758
1da177e4 1759 if (port) {
1da177e4 1760 port->actor_port_priority = 0xff;
1da177e4 1761 port->actor_port_aggregator_identifier = 0;
d238d458 1762 port->ntt = false;
3bf2d28a
VF		 1763 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1764 AD_STATE_LACP_ACTIVITY;
1765 port->actor_oper_port_state = AD_STATE_AGGREGATION |
1766 AD_STATE_LACP_ACTIVITY;
1da177e4 1767
7bfc4753 1768 if (lacp_fast)
1da177e4 1769 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1da177e4 1770
c7e703d0
HE		 1771 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1772 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1773
f48127b6 1774 port->is_enabled = true;
3bf2d28a 1775 /* private parameters */
19a12049 1776 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1da177e4
LT		 1777 port->sm_rx_state = 0;
1778 port->sm_rx_timer_counter = 0;
1779 port->sm_periodic_state = 0;
1780 port->sm_periodic_timer_counter = 0;
1781 port->sm_mux_state = 0;
1782 port->sm_mux_timer_counter = 0;
1783 port->sm_tx_state = 0;
1da177e4
LT		 1784 port->aggregator = NULL;
1785 port->next_port_in_aggregator = NULL;
1786 port->transaction_id = 0;
1787
14c9551a
MB		 1788 port->sm_churn_actor_timer_counter = 0;
1789 port->sm_churn_actor_state = 0;
1790 port->churn_actor_count = 0;
1791 port->sm_churn_partner_timer_counter = 0;
1792 port->sm_churn_partner_state = 0;
1793 port->churn_partner_count = 0;
1794
7addeef6 1795 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1da177e4
LT		 1796 }
1797}
1798
1799/**
1800 * ad_enable_collecting_distributing - enable a port's transmit/receive
1801 * @port: the port we're looking at
ee637714 1802 * @update_slave_arr: Does slave array need update?
1da177e4
LT		 1803 *
1804 * Enable @port if it's in an active aggregator
1805 */
ee637714
MB		 1806static void ad_enable_collecting_distributing(struct port *port,
1807 bool *update_slave_arr)
1da177e4
LT		 1808{
1809 if (port->aggregator->is_active) {
a4aee5c8
JP		 1810 pr_debug("Enabling port %d(LAG %d)\n",
1811 port->actor_port_number,
1812 port->aggregator->aggregator_identifier);
1da177e4 1813 __enable_port(port);
ee637714
MB		 1814 /* Slave array needs update */
1815 *update_slave_arr = true;
1da177e4
LT		 1816 }
1817}
1818
1819/**
1820 * ad_disable_collecting_distributing - disable a port's transmit/receive
1821 * @port: the port we're looking at
ee637714 1822 * @update_slave_arr: Does slave array need update?
1da177e4 1823 */
ee637714
MB		 1824static void ad_disable_collecting_distributing(struct port *port,
1825 bool *update_slave_arr)
1da177e4 1826{
3bf2d28a
VF		 1827 if (port->aggregator &&
1828 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1829 &(null_mac_addr))) {
a4aee5c8
JP		 1830 pr_debug("Disabling port %d(LAG %d)\n",
1831 port->actor_port_number,
1832 port->aggregator->aggregator_identifier);
1da177e4 1833 __disable_port(port);
ee637714
MB		 1834 /* Slave array needs an update */
1835 *update_slave_arr = true;
1da177e4
LT		 1836 }
1837}
1838
1da177e4
LT		 1839/**
1840 * ad_marker_info_received - handle receive of a Marker information frame
1841 * @marker_info: Marker info received
1842 * @port: the port we're looking at
1da177e4 1843 */
1c3f0b8e
MD		 1844static void ad_marker_info_received(struct bond_marker *marker_info,
1845 struct port *port)
1da177e4 1846{
1c3f0b8e 1847 struct bond_marker marker;
1da177e4 1848
3bf2d28a 1849 /* copy the received marker data to the response marker */
1c3f0b8e 1850 memcpy(&marker, marker_info, sizeof(struct bond_marker));
3bf2d28a 1851 /* change the marker subtype to marker response */
128ea6c3 1852 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1da177e4 1853
3bf2d28a 1854 /* send the marker response */
1da177e4 1855 if (ad_marker_send(port, &marker) >= 0) {
a4aee5c8
JP		 1856 pr_debug("Sent Marker Response on port %d\n",
1857 port->actor_port_number);
1da177e4
LT		 1858 }
1859}
1860
1861/**
1862 * ad_marker_response_received - handle receive of a marker response frame
1863 * @marker: marker PDU received
1864 * @port: the port we're looking at
1865 *
1866 * This function does nothing since we decided not to implement send and handle
1867 * response for marker PDU's, in this stage, but only to respond to marker
1868 * information.
1869 */
1c3f0b8e 1870static void ad_marker_response_received(struct bond_marker *marker,
3bf2d28a 1871 struct port *port)
1da177e4 1872{
3bf2d28a
VF		 1873 marker = NULL;
1874 port = NULL;
1875 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1da177e4
LT		 1876}
1877
3bf2d28a 1878/* ========= AD exported functions to the main bonding code ========= */
1da177e4 1879
3bf2d28a 1880/* Check aggregators status in team every T seconds */
1da177e4
LT		 1881#define AD_AGGREGATOR_SELECTION_TIMER 8
1882
3bf2d28a
VF		 1883/**
1884 * bond_3ad_initiate_agg_selection - initate aggregator selection
1885 * @bond: bonding struct
fd989c83
JV		 1886 *
1887 * Set the aggregation selection timer, to initiate an agg selection in
1888 * the very near future. Called during first initialization, and during
1889 * any down to up transitions of the bond.
1890 */
1891void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1892{
1893 BOND_AD_INFO(bond).agg_select_timer = timeout;
fd989c83
JV		 1894}
1895
1da177e4
LT		 1896/**
1897 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1898 * @bond: bonding struct to work on
1899 * @tick_resolution: tick duration (millisecond resolution)
1da177e4
LT		 1900 *
1901 * Can be called only after the mac address of the bond is set.
1902 */
56d00c67 1903void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
3a6d54c5 1904{
815117ad 1905 /* check that the bond is not initialized yet */
1906 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
3a6d54c5 1907 bond->dev->dev_addr)) {
1da177e4 1908
163c8ff3 1909 BOND_AD_INFO(bond).aggregator_identifier = 0;
1da177e4 1910
1da177e4
LT		 1911 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1912 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1913
3bf2d28a
VF		 1914 /* initialize how many times this module is called in one
1915 * second (should be about every 100ms)
1916 */
1da177e4
LT		 1917 ad_ticks_per_sec = tick_resolution;
1918
fd989c83
JV		 1919 bond_3ad_initiate_agg_selection(bond,
1920 AD_AGGREGATOR_SELECTION_TIMER *
1921 ad_ticks_per_sec);
1da177e4
LT		 1922 }
1923}
1924
1925/**
1926 * bond_3ad_bind_slave - initialize a slave's port
1927 * @slave: slave struct to work on
1928 *
1929 * Returns: 0 on success
1930 * < 0 on error
1931 */
359632e5 1932void bond_3ad_bind_slave(struct slave *slave)
1da177e4
LT		 1933{
1934 struct bonding *bond = bond_get_bond_by_slave(slave);
1935 struct port *port;
1936 struct aggregator *aggregator;
1937
359632e5 1938 /* check that the slave has not been initialized yet. */
3fdddd85 1939 if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1da177e4 1940
359632e5 1941 /* port initialization */
3fdddd85 1942 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4 1943
bf0239a9 1944 ad_initialize_port(port, bond->params.lacp_fast);
1da177e4
LT		 1945
1946 port->slave = slave;
3fdddd85 1947 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
359632e5 1948 /* key is determined according to the link speed, duplex and user key(which
1949 * is yet not supported)
359632e5 1950 */
3bf2d28a 1951 port->actor_admin_port_key = 0;
1da177e4
LT		 1952 port->actor_admin_port_key |= __get_duplex(port);
1953 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1954 port->actor_oper_port_key = port->actor_admin_port_key;
3bf2d28a
VF		 1955 /* if the port is not full duplex, then the port should be not
1956 * lacp Enabled
1957 */
cb8dda90 1958 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1da177e4 1959 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
359632e5 1960 /* actor system is the bond's system */
1da177e4 1961 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
3bf2d28a
VF		 1962 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1963 * lacpdu's are sent in one second)
1964 */
1da177e4 1965 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1da177e4
LT		 1966
1967 __disable_port(port);
1da177e4 1968
359632e5 1969 /* aggregator initialization */
3fdddd85 1970 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1da177e4
LT		 1971
1972 ad_initialize_agg(aggregator);
1973
1974 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
163c8ff3 1975 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1da177e4
LT		 1976 aggregator->slave = slave;
1977 aggregator->is_active = 0;
1978 aggregator->num_of_ports = 0;
1979 }
1da177e4
LT		 1980}
1981
1982/**
1983 * bond_3ad_unbind_slave - deinitialize a slave's port
1984 * @slave: slave struct to work on
1985 *
1986 * Search for the aggregator that is related to this port, remove the
1987 * aggregator and assign another aggregator for other port related to it
1988 * (if any), and remove the port.
1989 */
1990void bond_3ad_unbind_slave(struct slave *slave)
1991{
1992 struct port *port, *prev_port, *temp_port;
1993 struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1994 int select_new_active_agg = 0;
0b088264
VF		 1995 struct bonding *bond = slave->bond;
1996 struct slave *slave_iter;
1997 struct list_head *iter;
ee637714 1998 bool dummy_slave_update; /* Ignore this value as caller updates array */
a361c83c 1999
e470259f
NA		 2000 /* Sync against bond_3ad_state_machine_handler() */
2001 spin_lock_bh(&bond->mode_lock);
3fdddd85 2002 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2003 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4 2004
3bf2d28a 2005 /* if slave is null, the whole port is not initialized */
1da177e4 2006 if (!port->slave) {
d4471f5e
VF		 2007 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
2008 slave->dev->name);
e470259f 2009 goto out;
1da177e4
LT		 2010 }
2011
d4471f5e
VF		 2012 netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
2013 aggregator->aggregator_identifier);
1da177e4
LT		 2014
2015 /* Tell the partner that this port is not suitable for aggregation */
2016 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2017 __update_lacpdu_from_port(port);
2018 ad_lacpdu_send(port);
2019
3bf2d28a 2020 /* check if this aggregator is occupied */
1da177e4 2021 if (aggregator->lag_ports) {
3bf2d28a
VF		 2022 /* check if there are other ports related to this aggregator
2023 * except the port related to this slave(thats ensure us that
2024 * there is a reason to search for new aggregator, and that we
2025 * will find one
2026 */
2027 if ((aggregator->lag_ports != port) ||
2028 (aggregator->lag_ports->next_port_in_aggregator)) {
2029 /* find new aggregator for the related port(s) */
0b088264 2030 bond_for_each_slave(bond, slave_iter, iter) {
3fdddd85 2031 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
3bf2d28a
VF		 2032 /* if the new aggregator is empty, or it is
2033 * connected to our port only
2034 */
2035 if (!new_aggregator->lag_ports ||
2036 ((new_aggregator->lag_ports == port) &&
2037 !new_aggregator->lag_ports->next_port_in_aggregator))
1da177e4 2038 break;
1da177e4 2039 }
0b088264
VF		 2040 if (!slave_iter)
2041 new_aggregator = NULL;
3bf2d28a
VF		 2042
2043 /* if new aggregator found, copy the aggregator's
2044 * parameters and connect the related lag_ports to the
2045 * new aggregator
2046 */
1da177e4 2047 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
d4471f5e
VF		 2048 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2049 aggregator->aggregator_identifier,
2050 new_aggregator->aggregator_identifier);
1da177e4 2051
3bf2d28a
VF		 2052 if ((new_aggregator->lag_ports == port) &&
2053 new_aggregator->is_active) {
d4471f5e 2054 netdev_info(bond->dev, "Removing an active aggregator\n");
1da177e4
LT		 2055 select_new_active_agg = 1;
2056 }
2057
2058 new_aggregator->is_individual = aggregator->is_individual;
2059 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2060 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2061 new_aggregator->partner_system = aggregator->partner_system;
2062 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2063 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2064 new_aggregator->receive_state = aggregator->receive_state;
2065 new_aggregator->transmit_state = aggregator->transmit_state;
2066 new_aggregator->lag_ports = aggregator->lag_ports;
2067 new_aggregator->is_active = aggregator->is_active;
2068 new_aggregator->num_of_ports = aggregator->num_of_ports;
2069
3bf2d28a
VF		 2070 /* update the information that is written on
2071 * the ports about the aggregator
2072 */
128ea6c3
BD		 2073 for (temp_port = aggregator->lag_ports; temp_port;
2074 temp_port = temp_port->next_port_in_aggregator) {
2075 temp_port->aggregator = new_aggregator;
1da177e4
LT		 2076 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2077 }
2078
1da177e4 2079 ad_clear_agg(aggregator);
a361c83c 2080
7bfc4753 2081 if (select_new_active_agg)
ee637714
MB		 2082 ad_agg_selection_logic(__get_first_agg(port),
2083 &dummy_slave_update);
1da177e4 2084 } else {
d4471f5e 2085 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
1da177e4 2086 }
3bf2d28a
VF		 2087 } else {
2088 /* in case that the only port related to this
2089 * aggregator is the one we want to remove
2090 */
1da177e4 2091 select_new_active_agg = aggregator->is_active;
1da177e4
LT		 2092 ad_clear_agg(aggregator);
2093 if (select_new_active_agg) {
d4471f5e 2094 netdev_info(bond->dev, "Removing an active aggregator\n");
3bf2d28a 2095 /* select new active aggregator */
74684493
VF		 2096 temp_aggregator = __get_first_agg(port);
2097 if (temp_aggregator)
ee637714
MB		 2098 ad_agg_selection_logic(temp_aggregator,
2099 &dummy_slave_update);
1da177e4
LT		 2100 }
2101 }
2102 }
2103
d4471f5e 2104 netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
3bf2d28a
VF		 2105
2106 /* find the aggregator that this port is connected to */
0b088264 2107 bond_for_each_slave(bond, slave_iter, iter) {
3fdddd85 2108 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
1da177e4 2109 prev_port = NULL;
3bf2d28a 2110 /* search the port in the aggregator's related ports */
128ea6c3
BD		 2111 for (temp_port = temp_aggregator->lag_ports; temp_port;
2112 prev_port = temp_port,
3bf2d28a
VF		 2113 temp_port = temp_port->next_port_in_aggregator) {
2114 if (temp_port == port) {
2115 /* the aggregator found - detach the port from
2116 * this aggregator
2117 */
7bfc4753 2118 if (prev_port)
1da177e4 2119 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
7bfc4753 2120 else
1da177e4 2121 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
1da177e4 2122 temp_aggregator->num_of_ports--;
128ea6c3 2123 if (temp_aggregator->num_of_ports == 0) {
1da177e4 2124 select_new_active_agg = temp_aggregator->is_active;
1da177e4
LT		 2125 ad_clear_agg(temp_aggregator);
2126 if (select_new_active_agg) {
d4471f5e 2127 netdev_info(bond->dev, "Removing an active aggregator\n");
3bf2d28a 2128 /* select new active aggregator */
ee637714
MB		 2129 ad_agg_selection_logic(__get_first_agg(port),
2130 &dummy_slave_update);
1da177e4
LT		 2131 }
2132 }
2133 break;
2134 }
2135 }
2136 }
128ea6c3 2137 port->slave = NULL;
e470259f
NA		 2138
2139out:
2140 spin_unlock_bh(&bond->mode_lock);
1da177e4
LT		 2141}
2142
2143/**
2144 * bond_3ad_state_machine_handler - handle state machines timeout
2145 * @bond: bonding struct to work on
2146 *
2147 * The state machine handling concept in this module is to check every tick
2148 * which state machine should operate any function. The execution order is
2149 * round robin, so when we have an interaction between state machines, the
2150 * reply of one to each other might be delayed until next tick.
2151 *
2152 * This function also complete the initialization when the agg_select_timer
2153 * times out, and it selects an aggregator for the ports that are yet not
2154 * related to any aggregator, and selects the active aggregator for a bond.
2155 */
1b76b316 2156void bond_3ad_state_machine_handler(struct work_struct *work)
1da177e4 2157{
1b76b316
JV		 2158 struct bonding *bond = container_of(work, struct bonding,
2159 ad_work.work);
1da177e4 2160 struct aggregator *aggregator;
3c4c88a1
VF		 2161 struct list_head *iter;
2162 struct slave *slave;
2163 struct port *port;
5e5b0665 2164 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
ee637714 2165 bool update_slave_arr = false;
1da177e4 2166
e470259f
NA		 2167 /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2168 * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2169 * concurrently due to incoming LACPDU as well.
2170 */
b7435628 2171 spin_lock_bh(&bond->mode_lock);
be79bd04 2172 rcu_read_lock();
1f2cd845 2173
be79bd04 2174 /* check if there are any slaves */
0965a1f3 2175 if (!bond_has_slaves(bond))
1da177e4 2176 goto re_arm;
1da177e4 2177
be79bd04 2178 /* check if agg_select_timer timer after initialize is timed out */
3bf2d28a
VF		 2179 if (BOND_AD_INFO(bond).agg_select_timer &&
2180 !(--BOND_AD_INFO(bond).agg_select_timer)) {
be79bd04 2181 slave = bond_first_slave_rcu(bond);
3fdddd85 2182 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
fe9323da 2183
be79bd04 2184 /* select the active aggregator for the bond */
fe9323da 2185 if (port) {
1da177e4 2186 if (!port->slave) {
d4471f5e
VF		 2187 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2188 bond->dev->name);
1da177e4
LT		 2189 goto re_arm;
2190 }
2191
2192 aggregator = __get_first_agg(port);
ee637714 2193 ad_agg_selection_logic(aggregator, &update_slave_arr);
1da177e4 2194 }
f0c76d61 2195 bond_3ad_set_carrier(bond);
1da177e4
LT		 2196 }
2197
be79bd04 2198 /* for each port run the state machines */
2199 bond_for_each_slave_rcu(bond, slave, iter) {
3fdddd85 2200 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4 2201 if (!port->slave) {
d4471f5e 2202 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
86a2b9cf 2203 bond->dev->name);
1da177e4
LT		 2204 goto re_arm;
2205 }
2206
2207 ad_rx_machine(NULL, port);
2208 ad_periodic_machine(port);
ee637714
MB		 2209 ad_port_selection_logic(port, &update_slave_arr);
2210 ad_mux_machine(port, &update_slave_arr);
1da177e4 2211 ad_tx_machine(port);
14c9551a 2212 ad_churn_machine(port);
1da177e4 2213
be79bd04 2214 /* turn off the BEGIN bit, since we already handled it */
7bfc4753 2215 if (port->sm_vars & AD_PORT_BEGIN)
1da177e4 2216 port->sm_vars &= ~AD_PORT_BEGIN;
1da177e4
LT		 2217 }
2218
2219re_arm:
5e5b0665 2220 bond_for_each_slave_rcu(bond, slave, iter) {
2221 if (slave->should_notify) {
2222 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2223 break;
2224 }
2225 }
be79bd04 2226 rcu_read_unlock();
b7435628 2227 spin_unlock_bh(&bond->mode_lock);
5e5b0665 2228
ee637714
MB		 2229 if (update_slave_arr)
2230 bond_slave_arr_work_rearm(bond, 0);
2231
5e5b0665 2232 if (should_notify_rtnl && rtnl_trylock()) {
b0929915 2233 bond_slave_state_notify(bond);
5e5b0665 2234 rtnl_unlock();
2235 }
be79bd04 2236 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
1da177e4
LT		 2237}
2238
2239/**
2240 * bond_3ad_rx_indication - handle a received frame
2241 * @lacpdu: received lacpdu
2242 * @slave: slave struct to work on
2243 * @length: length of the data received
2244 *
2245 * It is assumed that frames that were sent on this NIC don't returned as new
2246 * received frames (loopback). Since only the payload is given to this
2247 * function, it check for loopback.
2248 */
3bf2d28a
VF		 2249static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2250 u16 length)
1da177e4
LT		 2251{
2252 struct port *port;
13a8e0c8 2253 int ret = RX_HANDLER_ANOTHER;
1da177e4
LT		 2254
2255 if (length >= sizeof(struct lacpdu)) {
2256
3fdddd85 2257 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4
LT		 2258
2259 if (!port->slave) {
d4471f5e
VF		 2260 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2261 slave->dev->name, slave->bond->dev->name);
13a8e0c8 2262 return ret;
1da177e4
LT		 2263 }
2264
2265 switch (lacpdu->subtype) {
2266 case AD_TYPE_LACPDU:
13a8e0c8 2267 ret = RX_HANDLER_CONSUMED;
2f637324
SA		 2268 netdev_dbg(slave->bond->dev,
2269 "Received LACPDU on port %d slave %s\n",
2270 port->actor_port_number,
2271 slave->dev->name);
16d79d7d 2272 /* Protect against concurrent state machines */
e470259f 2273 spin_lock(&slave->bond->mode_lock);
1da177e4 2274 ad_rx_machine(lacpdu, port);
e470259f 2275 spin_unlock(&slave->bond->mode_lock);
1da177e4
LT		 2276 break;
2277
2278 case AD_TYPE_MARKER:
13a8e0c8 2279 ret = RX_HANDLER_CONSUMED;
3bf2d28a
VF		 2280 /* No need to convert fields to Little Endian since we
2281 * don't use the marker's fields.
2282 */
1da177e4 2283
1c3f0b8e 2284 switch (((struct bond_marker *)lacpdu)->tlv_type) {
1da177e4 2285 case AD_MARKER_INFORMATION_SUBTYPE:
d4471f5e
VF		 2286 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2287 port->actor_port_number);
1c3f0b8e 2288 ad_marker_info_received((struct bond_marker *)lacpdu, port);
1da177e4
LT		 2289 break;
2290
2291 case AD_MARKER_RESPONSE_SUBTYPE:
d4471f5e
VF		 2292 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2293 port->actor_port_number);
1c3f0b8e 2294 ad_marker_response_received((struct bond_marker *)lacpdu, port);
1da177e4
LT		 2295 break;
2296
2297 default:
d4471f5e
VF		 2298 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2299 port->actor_port_number);
1da177e4
LT		 2300 }
2301 }
2302 }
13a8e0c8 2303 return ret;
1da177e4
LT		 2304}
2305
2306/**
2307 * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2308 * @slave: slave struct to work on
2309 *
2310 * Handle reselection of aggregator (if needed) for this port.
2311 */
2312void bond_3ad_adapter_speed_changed(struct slave *slave)
2313{
2314 struct port *port;
2315
3fdddd85 2316 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4 2317
71a06c59 2318 /* if slave is null, the whole port is not initialized */
1da177e4 2319 if (!port->slave) {
d4471f5e
VF		 2320 netdev_warn(slave->bond->dev, "speed changed for uninitialized port on %s\n",
2321 slave->dev->name);
1da177e4
LT		 2322 return;
2323 }
2324
e470259f 2325 spin_lock_bh(&slave->bond->mode_lock);
71a06c59 2326
cb8dda90 2327 port->actor_admin_port_key &= ~AD_SPEED_KEY_MASKS;
c3cd9ee1
MB		 2328 port->actor_admin_port_key |= __get_link_speed(port) << 1;
2329 port->actor_oper_port_key = port->actor_admin_port_key;
d4471f5e 2330 netdev_dbg(slave->bond->dev, "Port %d changed speed\n", port->actor_port_number);
71a06c59 2331 /* there is no need to reselect a new aggregator, just signal the
2332 * state machines to reinitialize
2333 */
1da177e4 2334 port->sm_vars |= AD_PORT_BEGIN;
71a06c59 2335
e470259f 2336 spin_unlock_bh(&slave->bond->mode_lock);
1da177e4
LT		 2337}
2338
2339/**
2340 * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2341 * @slave: slave struct to work on
2342 *
2343 * Handle reselection of aggregator (if needed) for this port.
2344 */
2345void bond_3ad_adapter_duplex_changed(struct slave *slave)
2346{
2347 struct port *port;
2348
3fdddd85 2349 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4 2350
bca44a73 2351 /* if slave is null, the whole port is not initialized */
1da177e4 2352 if (!port->slave) {
d4471f5e
VF		 2353 netdev_warn(slave->bond->dev, "duplex changed for uninitialized port on %s\n",
2354 slave->dev->name);
1da177e4
LT		 2355 return;
2356 }
2357
e470259f 2358 spin_lock_bh(&slave->bond->mode_lock);
bca44a73 2359
cb8dda90 2360 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_MASKS;
c3cd9ee1
MB		 2361 port->actor_admin_port_key |= __get_duplex(port);
2362 port->actor_oper_port_key = port->actor_admin_port_key;
2f637324
SA		 2363 netdev_dbg(slave->bond->dev, "Port %d slave %s changed duplex\n",
2364 port->actor_port_number, slave->dev->name);
2365 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
2366 port->sm_vars |= AD_PORT_LACP_ENABLED;
bca44a73 2367 /* there is no need to reselect a new aggregator, just signal the
2368 * state machines to reinitialize
2369 */
1da177e4 2370 port->sm_vars |= AD_PORT_BEGIN;
bca44a73 2371
e470259f 2372 spin_unlock_bh(&slave->bond->mode_lock);
1da177e4
LT		 2373}
2374
2375/**
2376 * bond_3ad_handle_link_change - handle a slave's link status change indication
2377 * @slave: slave struct to work on
2378 * @status: whether the link is now up or down
2379 *
2380 * Handle reselection of aggregator (if needed) for this port.
2381 */
2382void bond_3ad_handle_link_change(struct slave *slave, char link)
2383{
2384 struct port *port;
2385
3fdddd85 2386 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4 2387
108db736 2388 /* if slave is null, the whole port is not initialized */
1da177e4 2389 if (!port->slave) {
d4471f5e
VF		 2390 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2391 slave->dev->name);
1da177e4
LT		 2392 return;
2393 }
2394
e470259f 2395 spin_lock_bh(&slave->bond->mode_lock);
108db736 2396 /* on link down we are zeroing duplex and speed since
2397 * some of the adaptors(ce1000.lan) report full duplex/speed
2398 * instead of N/A(duplex) / 0(speed).
2399 *
2400 * on link up we are forcing recheck on the duplex and speed since
2401 * some of he adaptors(ce1000.lan) report.
2402 */
c3cd9ee1 2403 port->actor_admin_port_key &= ~(AD_DUPLEX_KEY_MASKS|AD_SPEED_KEY_MASKS);
1da177e4 2404 if (link == BOND_LINK_UP) {
f48127b6 2405 port->is_enabled = true;
c3cd9ee1
MB		 2406 port->actor_admin_port_key |=
2407 (__get_link_speed(port) << 1) | __get_duplex(port);
2408 if (port->actor_admin_port_key & AD_DUPLEX_KEY_MASKS)
f6a69a8f 2409 port->sm_vars |= AD_PORT_LACP_ENABLED;
1da177e4
LT		 2410 } else {
2411 /* link has failed */
f48127b6 2412 port->is_enabled = false;
f6a69a8f 2413 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1da177e4 2414 }
c3cd9ee1 2415 port->actor_oper_port_key = port->actor_admin_port_key;
d4471f5e
VF		 2416 netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2417 port->actor_port_number,
2418 link == BOND_LINK_UP ? "UP" : "DOWN");
108db736 2419 /* there is no need to reselect a new aggregator, just signal the
2420 * state machines to reinitialize
2421 */
1da177e4 2422 port->sm_vars |= AD_PORT_BEGIN;
108db736 2423
e470259f 2424 spin_unlock_bh(&slave->bond->mode_lock);
ee637714
MB		 2425
2426 /* RTNL is held and mode_lock is released so it's safe
2427 * to update slave_array here.
2428 */
2429 bond_update_slave_arr(slave->bond, NULL);
1da177e4
LT		 2430}
2431
3bf2d28a
VF		 2432/**
2433 * bond_3ad_set_carrier - set link state for bonding master
2434 * @bond - bonding structure
2435 *
2436 * if we have an active aggregator, we're up, if not, we're down.
2437 * Presumes that we cannot have an active aggregator if there are
2438 * no slaves with link up.
ff59c456 2439 *
031ae4de
JV		 2440 * This behavior complies with IEEE 802.3 section 43.3.9.
2441 *
ff59c456
JV		 2442 * Called by bond_set_carrier(). Return zero if carrier state does not
2443 * change, nonzero if it does.
2444 */
2445int bond_3ad_set_carrier(struct bonding *bond)
2446{
655f8919 2447 struct aggregator *active;
dec1e90e 2448 struct slave *first_slave;
c1bc9644 2449 int ret = 1;
655f8919 2450
be79bd04 2451 rcu_read_lock();
2452 first_slave = bond_first_slave_rcu(bond);
c1bc9644
VF		 2453 if (!first_slave) {
2454 ret = 0;
2455 goto out;
2456 }
3fdddd85 2457 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
655f8919 2458 if (active) {
2459 /* are enough slaves available to consider link up? */
2460 if (active->num_of_ports < bond->params.min_links) {
2461 if (netif_carrier_ok(bond->dev)) {
2462 netif_carrier_off(bond->dev);
c1bc9644 2463 goto out;
655f8919 2464 }
2465 } else if (!netif_carrier_ok(bond->dev)) {
ff59c456 2466 netif_carrier_on(bond->dev);
c1bc9644 2467 goto out;
ff59c456 2468 }
c1bc9644 2469 } else if (netif_carrier_ok(bond->dev)) {
ff59c456 2470 netif_carrier_off(bond->dev);
ff59c456 2471 }
c1bc9644
VF		 2472out:
2473 rcu_read_unlock();
2474 return ret;
ff59c456
JV		 2475}
2476
1da177e4 2477/**
318debd8 2478 * __bond_3ad_get_active_agg_info - get information of the active aggregator
1da177e4
LT		 2479 * @bond: bonding struct to work on
2480 * @ad_info: ad_info struct to fill with the bond's info
2481 *
2482 * Returns: 0 on success
2483 * < 0 on error
2484 */
318debd8 2485int __bond_3ad_get_active_agg_info(struct bonding *bond,
2486 struct ad_info *ad_info)
1da177e4
LT		 2487{
2488 struct aggregator *aggregator = NULL;
3c4c88a1
VF		 2489 struct list_head *iter;
2490 struct slave *slave;
1da177e4
LT		 2491 struct port *port;
2492
47e91f56 2493 bond_for_each_slave_rcu(bond, slave, iter) {
3fdddd85 2494 port = &(SLAVE_AD_INFO(slave)->port);
1da177e4
LT		 2495 if (port->aggregator && port->aggregator->is_active) {
2496 aggregator = port->aggregator;
2497 break;
2498 }
2499 }
2500
21f374c6
JP		 2501 if (!aggregator)
2502 return -1;
2503
2504 ad_info->aggregator_id = aggregator->aggregator_identifier;
2505 ad_info->ports = aggregator->num_of_ports;
2506 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2507 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2508 ether_addr_copy(ad_info->partner_system,
2509 aggregator->partner_system.mac_addr_value);
2510 return 0;
1da177e4
LT		 2511}
2512
318debd8 2513int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2514{
2515 int ret;
2516
47e91f56 2517 rcu_read_lock();
318debd8 2518 ret = __bond_3ad_get_active_agg_info(bond, ad_info);
47e91f56 2519 rcu_read_unlock();
318debd8 2520
2521 return ret;
2522}
2523
de063b70
ED		 2524int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2525 struct slave *slave)
1da177e4 2526{
de063b70
ED		 2527 struct lacpdu *lacpdu, _lacpdu;
2528
3aba891d 2529 if (skb->protocol != PKT_TYPE_LACPDU)
86e74986 2530 return RX_HANDLER_ANOTHER;
b3053251 2531
bb54e589
MB		 2532 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2533 return RX_HANDLER_ANOTHER;
2534
de063b70
ED		 2535 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2536 if (!lacpdu)
86e74986 2537 return RX_HANDLER_ANOTHER;
ab12811c 2538
86e74986 2539 return bond_3ad_rx_indication(lacpdu, slave, skb->len);
1da177e4 2540}
ba824a8b 2541
3bf2d28a
VF		 2542/**
2543 * bond_3ad_update_lacp_rate - change the lacp rate
2544 * @bond - bonding struct
2545 *
ba824a8b
PP		 2546 * When modify lacp_rate parameter via sysfs,
2547 * update actor_oper_port_state of each port.
2548 *
e470259f 2549 * Hold bond->mode_lock,
ba824a8b
PP		 2550 * so we can modify port->actor_oper_port_state,
2551 * no matter bond is up or down.
2552 */
2553void bond_3ad_update_lacp_rate(struct bonding *bond)
2554{
ba824a8b 2555 struct port *port = NULL;
9caff1e7 2556 struct list_head *iter;
c509316b 2557 struct slave *slave;
ba824a8b
PP		 2558 int lacp_fast;
2559
ba824a8b 2560 lacp_fast = bond->params.lacp_fast;
e470259f 2561 spin_lock_bh(&bond->mode_lock);
9caff1e7 2562 bond_for_each_slave(bond, slave, iter) {
3fdddd85 2563 port = &(SLAVE_AD_INFO(slave)->port);
ba824a8b
PP		 2564 if (lacp_fast)
2565 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2566 else
2567 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
ba824a8b 2568 }
e470259f 2569 spin_unlock_bh(&bond->mode_lock);
ba824a8b 2570}
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