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bond_3ad.c
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linux-6.19.14/drivers/net/bonding/bond_3ad.c
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. 4 */ 5 6#include <linux/skbuff.h> 7#include <linux/if_ether.h> 8#include <linux/netdevice.h> 9#include <linux/spinlock.h> 10#include <linux/ethtool.h> 11#include <linux/etherdevice.h> 12#include <linux/if_bonding.h> 13#include <linux/pkt_sched.h> 14#include <net/net_namespace.h> 15#include <net/bonding.h> 16#include <net/bond_3ad.h> 17#include <net/netlink.h> 18 19/* General definitions */ 20#define AD_SHORT_TIMEOUT 1 21#define AD_LONG_TIMEOUT 0 22#define AD_STANDBY 0x2 23#define AD_MAX_TX_IN_SECOND 3 24#define AD_COLLECTOR_MAX_DELAY 0 25 26/* Timer definitions (43.4.4 in the 802.3ad standard) */ 27#define AD_FAST_PERIODIC_TIME 1 28#define AD_SLOW_PERIODIC_TIME 30 29#define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME) 30#define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME) 31#define AD_CHURN_DETECTION_TIME 60 32#define AD_AGGREGATE_WAIT_TIME 2 33 34/* Port Variables definitions used by the State Machines (43.4.7 in the 35 * 802.3ad standard) 36 */ 37#define AD_PORT_BEGIN 0x1 38#define AD_PORT_LACP_ENABLED 0x2 39#define AD_PORT_ACTOR_CHURN 0x4 40#define AD_PORT_PARTNER_CHURN 0x8 41#define AD_PORT_READY 0x10 42#define AD_PORT_READY_N 0x20 43#define AD_PORT_MATCHED 0x40 44#define AD_PORT_STANDBY 0x80 45#define AD_PORT_SELECTED 0x100 46#define AD_PORT_MOVED 0x200 47#define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN) 48 49/* Port Key definitions 50 * key is determined according to the link speed, duplex and 51 * user key (which is yet not supported) 52 * -------------------------------------------------------------- 53 * Port key | User key (10 bits) | Speed (5 bits) | Duplex| 54 * -------------------------------------------------------------- 55 * |15 6|5 1|0 56 */ 57#define AD_DUPLEX_KEY_MASKS 0x1 58#define AD_SPEED_KEY_MASKS 0x3E 59#define AD_USER_KEY_MASKS 0xFFC0 60 61enum ad_link_speed_type { 62 AD_LINK_SPEED_1MBPS = 1, 63 AD_LINK_SPEED_10MBPS, 64 AD_LINK_SPEED_100MBPS, 65 AD_LINK_SPEED_1000MBPS, 66 AD_LINK_SPEED_2500MBPS, 67 AD_LINK_SPEED_5000MBPS, 68 AD_LINK_SPEED_10000MBPS, 69 AD_LINK_SPEED_14000MBPS, 70 AD_LINK_SPEED_20000MBPS, 71 AD_LINK_SPEED_25000MBPS, 72 AD_LINK_SPEED_40000MBPS, 73 AD_LINK_SPEED_50000MBPS, 74 AD_LINK_SPEED_56000MBPS, 75 AD_LINK_SPEED_100000MBPS, 76 AD_LINK_SPEED_200000MBPS, 77 AD_LINK_SPEED_400000MBPS, 78 AD_LINK_SPEED_800000MBPS, 79 AD_LINK_SPEED_1600000MBPS, 80}; 81 82/* compare MAC addresses */ 83#define MAC_ADDRESS_EQUAL(A, B) \ 84 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B) 85 86static const u16 ad_ticks_per_sec = 1000 / AD_TIMER_INTERVAL; 87static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000; 88 89const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned = { 90 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02 91}; 92 93/* ================= main 802.3ad protocol functions ================== */ 94static int ad_lacpdu_send(struct port *port); 95static int ad_marker_send(struct port *port, struct bond_marker *marker); 96static void ad_mux_machine(struct port *port, bool *update_slave_arr); 97static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port); 98static void ad_tx_machine(struct port *port); 99static void ad_periodic_machine(struct port *port); 100static void ad_port_selection_logic(struct port *port, bool *update_slave_arr); 101static void ad_agg_selection_logic(struct aggregator *aggregator, 102 bool *update_slave_arr); 103static void ad_clear_agg(struct aggregator *aggregator); 104static void ad_initialize_agg(struct aggregator *aggregator); 105static void ad_initialize_port(struct port *port, const struct bond_params *bond_params); 106static void ad_enable_collecting(struct port *port); 107static void ad_disable_distributing(struct port *port, 108 bool *update_slave_arr); 109static void ad_enable_collecting_distributing(struct port *port, 110 bool *update_slave_arr); 111static void ad_disable_collecting_distributing(struct port *port, 112 bool *update_slave_arr); 113static void ad_marker_info_received(struct bond_marker *marker_info, 114 struct port *port); 115static void ad_marker_response_received(struct bond_marker *marker, 116 struct port *port); 117static void ad_update_actor_keys(struct port *port, bool reset); 118 119 120/* ================= api to bonding and kernel code ================== */ 121 122/** 123 * __get_bond_by_port - get the port's bonding struct 124 * @port: the port we're looking at 125 * 126 * Return @port's bonding struct, or %NULL if it can't be found. 127 */ 128static inline struct bonding *__get_bond_by_port(struct port *port) 129{ 130 if (port->slave == NULL) 131 return NULL; 132 133 return bond_get_bond_by_slave(port->slave); 134} 135 136/** 137 * __get_first_agg - get the first aggregator in the bond 138 * @port: the port we're looking at 139 * 140 * Return the aggregator of the first slave in @bond, or %NULL if it can't be 141 * found. 142 * The caller must hold RCU or RTNL lock. 143 */ 144static inline struct aggregator *__get_first_agg(struct port *port) 145{ 146 struct bonding *bond = __get_bond_by_port(port); 147 struct slave *first_slave; 148 struct aggregator *agg; 149 150 /* If there's no bond for this port, or bond has no slaves */ 151 if (bond == NULL) 152 return NULL; 153 154 rcu_read_lock(); 155 first_slave = bond_first_slave_rcu(bond); 156 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL; 157 rcu_read_unlock(); 158 159 return agg; 160} 161 162/** 163 * __agg_has_partner - see if we have a partner 164 * @agg: the agregator we're looking at 165 * 166 * Return nonzero if aggregator has a partner (denoted by a non-zero ether 167 * address for the partner). Return 0 if not. 168 */ 169static inline int __agg_has_partner(struct aggregator *agg) 170{ 171 return !is_zero_ether_addr(agg->partner_system.mac_addr_value); 172} 173 174/** 175 * __disable_distributing_port - disable the port's slave for distributing. 176 * Port will still be able to collect. 177 * @port: the port we're looking at 178 * 179 * This will disable only distributing on the port's slave. 180 */ 181static void __disable_distributing_port(struct port *port) 182{ 183 bond_set_slave_tx_disabled_flags(port->slave, BOND_SLAVE_NOTIFY_LATER); 184} 185 186/** 187 * __enable_collecting_port - enable the port's slave for collecting, 188 * if it's up 189 * @port: the port we're looking at 190 * 191 * This will enable only collecting on the port's slave. 192 */ 193static void __enable_collecting_port(struct port *port) 194{ 195 struct slave *slave = port->slave; 196 197 if (slave->link == BOND_LINK_UP && bond_slave_is_up(slave)) 198 bond_set_slave_rx_enabled_flags(slave, BOND_SLAVE_NOTIFY_LATER); 199} 200 201/** 202 * __disable_port - disable the port's slave 203 * @port: the port we're looking at 204 * 205 * This will disable both collecting and distributing on the port's slave. 206 */ 207static inline void __disable_port(struct port *port) 208{ 209 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER); 210} 211 212/** 213 * __enable_port - enable the port's slave, if it's up 214 * @port: the port we're looking at 215 * 216 * This will enable both collecting and distributing on the port's slave. 217 */ 218static inline void __enable_port(struct port *port) 219{ 220 struct slave *slave = port->slave; 221 222 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave)) 223 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER); 224} 225 226/** 227 * __port_move_to_attached_state - check if port should transition back to attached 228 * state. 229 * @port: the port we're looking at 230 */ 231static bool __port_move_to_attached_state(struct port *port) 232{ 233 if (!(port->sm_vars & AD_PORT_SELECTED) || 234 (port->sm_vars & AD_PORT_STANDBY) || 235 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) || 236 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) 237 port->sm_mux_state = AD_MUX_ATTACHED; 238 239 return port->sm_mux_state == AD_MUX_ATTACHED; 240} 241 242/** 243 * __port_is_collecting_distributing - check if the port's slave is in the 244 * combined collecting/distributing state 245 * @port: the port we're looking at 246 */ 247static int __port_is_collecting_distributing(struct port *port) 248{ 249 return bond_is_active_slave(port->slave); 250} 251 252/** 253 * __get_agg_selection_mode - get the aggregator selection mode 254 * @port: the port we're looking at 255 * 256 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT. 257 */ 258static inline u32 __get_agg_selection_mode(struct port *port) 259{ 260 struct bonding *bond = __get_bond_by_port(port); 261 262 if (bond == NULL) 263 return BOND_AD_STABLE; 264 265 return bond->params.ad_select; 266} 267 268/** 269 * __check_agg_selection_timer - check if the selection timer has expired 270 * @port: the port we're looking at 271 */ 272static inline int __check_agg_selection_timer(struct port *port) 273{ 274 struct bonding *bond = __get_bond_by_port(port); 275 276 if (bond == NULL) 277 return 0; 278 279 return atomic_read(&BOND_AD_INFO(bond).agg_select_timer) ? 1 : 0; 280} 281 282/** 283 * __get_link_speed - get a port's speed 284 * @port: the port we're looking at 285 * 286 * Return @port's speed in 802.3ad enum format. i.e. one of: 287 * 0, 288 * %AD_LINK_SPEED_10MBPS, 289 * %AD_LINK_SPEED_100MBPS, 290 * %AD_LINK_SPEED_1000MBPS, 291 * %AD_LINK_SPEED_2500MBPS, 292 * %AD_LINK_SPEED_5000MBPS, 293 * %AD_LINK_SPEED_10000MBPS 294 * %AD_LINK_SPEED_14000MBPS, 295 * %AD_LINK_SPEED_20000MBPS 296 * %AD_LINK_SPEED_25000MBPS 297 * %AD_LINK_SPEED_40000MBPS 298 * %AD_LINK_SPEED_50000MBPS 299 * %AD_LINK_SPEED_56000MBPS 300 * %AD_LINK_SPEED_100000MBPS 301 * %AD_LINK_SPEED_200000MBPS 302 * %AD_LINK_SPEED_400000MBPS 303 * %AD_LINK_SPEED_800000MBPS 304 * %AD_LINK_SPEED_1600000MBPS 305 */ 306static u16 __get_link_speed(struct port *port) 307{ 308 struct slave *slave = port->slave; 309 u16 speed; 310 311 /* this if covers only a special case: when the configuration starts 312 * with link down, it sets the speed to 0. 313 * This is done in spite of the fact that the e100 driver reports 0 314 * to be compatible with MVT in the future. 315 */ 316 if (slave->link != BOND_LINK_UP) 317 speed = 0; 318 else { 319 switch (slave->speed) { 320 case SPEED_10: 321 speed = AD_LINK_SPEED_10MBPS; 322 break; 323 324 case SPEED_100: 325 speed = AD_LINK_SPEED_100MBPS; 326 break; 327 328 case SPEED_1000: 329 speed = AD_LINK_SPEED_1000MBPS; 330 break; 331 332 case SPEED_2500: 333 speed = AD_LINK_SPEED_2500MBPS; 334 break; 335 336 case SPEED_5000: 337 speed = AD_LINK_SPEED_5000MBPS; 338 break; 339 340 case SPEED_10000: 341 speed = AD_LINK_SPEED_10000MBPS; 342 break; 343 344 case SPEED_14000: 345 speed = AD_LINK_SPEED_14000MBPS; 346 break; 347 348 case SPEED_20000: 349 speed = AD_LINK_SPEED_20000MBPS; 350 break; 351 352 case SPEED_25000: 353 speed = AD_LINK_SPEED_25000MBPS; 354 break; 355 356 case SPEED_40000: 357 speed = AD_LINK_SPEED_40000MBPS; 358 break; 359 360 case SPEED_50000: 361 speed = AD_LINK_SPEED_50000MBPS; 362 break; 363 364 case SPEED_56000: 365 speed = AD_LINK_SPEED_56000MBPS; 366 break; 367 368 case SPEED_100000: 369 speed = AD_LINK_SPEED_100000MBPS; 370 break; 371 372 case SPEED_200000: 373 speed = AD_LINK_SPEED_200000MBPS; 374 break; 375 376 case SPEED_400000: 377 speed = AD_LINK_SPEED_400000MBPS; 378 break; 379 380 case SPEED_800000: 381 speed = AD_LINK_SPEED_800000MBPS; 382 break; 383 384 case SPEED_1600000: 385 speed = AD_LINK_SPEED_1600000MBPS; 386 break; 387 388 default: 389 /* unknown speed value from ethtool. shouldn't happen */ 390 if (slave->speed != SPEED_UNKNOWN) 391 pr_err_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n", 392 slave->bond->dev->name, 393 slave->dev->name, slave->speed, 394 port->actor_port_number); 395 speed = 0; 396 break; 397 } 398 } 399 400 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n", 401 port->actor_port_number, speed); 402 return speed; 403} 404 405/** 406 * __get_duplex - get a port's duplex 407 * @port: the port we're looking at 408 * 409 * Return @port's duplex in 802.3ad bitmask format. i.e.: 410 * 0x01 if in full duplex 411 * 0x00 otherwise 412 */ 413static u8 __get_duplex(struct port *port) 414{ 415 struct slave *slave = port->slave; 416 u8 retval = 0x0; 417 418 /* handling a special case: when the configuration starts with 419 * link down, it sets the duplex to 0. 420 */ 421 if (slave->link == BOND_LINK_UP) { 422 switch (slave->duplex) { 423 case DUPLEX_FULL: 424 retval = 0x1; 425 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n", 426 port->actor_port_number); 427 break; 428 case DUPLEX_HALF: 429 default: 430 retval = 0x0; 431 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n", 432 port->actor_port_number); 433 break; 434 } 435 } 436 return retval; 437} 438 439static void __ad_actor_update_port(struct port *port) 440{ 441 const struct bonding *bond = bond_get_bond_by_slave(port->slave); 442 443 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr; 444 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority; 445 port->actor_port_priority = SLAVE_AD_INFO(port->slave)->port_priority; 446} 447 448/* Conversions */ 449 450/** 451 * __ad_timer_to_ticks - convert a given timer type to AD module ticks 452 * @timer_type: which timer to operate 453 * @par: timer parameter. see below 454 * 455 * If @timer_type is %current_while_timer, @par indicates long/short timer. 456 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME, 457 * %SLOW_PERIODIC_TIME. 458 */ 459static u16 __ad_timer_to_ticks(u16 timer_type, u16 par) 460{ 461 u16 retval = 0; /* to silence the compiler */ 462 463 switch (timer_type) { 464 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */ 465 if (par) 466 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); 467 else 468 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); 469 break; 470 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */ 471 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); 472 break; 473 case AD_PERIODIC_TIMER: /* for periodic machine */ 474 retval = (par*ad_ticks_per_sec); /* long timeout */ 475 break; 476 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */ 477 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); 478 break; 479 case AD_WAIT_WHILE_TIMER: /* for selection machine */ 480 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec); 481 break; 482 } 483 484 return retval; 485} 486 487 488/* ================= ad_rx_machine helper functions ================== */ 489 490/** 491 * __choose_matched - update a port's matched variable from a received lacpdu 492 * @lacpdu: the lacpdu we've received 493 * @port: the port we're looking at 494 * 495 * Update the value of the matched variable, using parameter values from a 496 * newly received lacpdu. Parameter values for the partner carried in the 497 * received PDU are compared with the corresponding operational parameter 498 * values for the actor. Matched is set to TRUE if all of these parameters 499 * match and the PDU parameter partner_state.aggregation has the same value as 500 * actor_oper_port_state.aggregation and lacp will actively maintain the link 501 * in the aggregation. Matched is also set to TRUE if the value of 502 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates 503 * an individual link and lacp will actively maintain the link. Otherwise, 504 * matched is set to FALSE. LACP is considered to be actively maintaining the 505 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both 506 * the actor's actor_oper_port_state.lacp_activity and the PDU's 507 * partner_state.lacp_activity variables are TRUE. 508 * 509 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is 510 * used here to implement the language from 802.3ad 43.4.9 that requires 511 * recordPDU to "match" the LACPDU parameters to the stored values. 512 */ 513static void __choose_matched(struct lacpdu *lacpdu, struct port *port) 514{ 515 /* check if all parameters are alike 516 * or this is individual link(aggregation == FALSE) 517 * then update the state machine Matched variable. 518 */ 519 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) && 520 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) && 521 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) && 522 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) && 523 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) && 524 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) || 525 ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0) 526 ) { 527 port->sm_vars |= AD_PORT_MATCHED; 528 } else { 529 port->sm_vars &= ~AD_PORT_MATCHED; 530 } 531} 532 533/** 534 * __record_pdu - record parameters from a received lacpdu 535 * @lacpdu: the lacpdu we've received 536 * @port: the port we're looking at 537 * 538 * Record the parameter values for the Actor carried in a received lacpdu as 539 * the current partner operational parameter values and sets 540 * actor_oper_port_state.defaulted to FALSE. 541 */ 542static void __record_pdu(struct lacpdu *lacpdu, struct port *port) 543{ 544 if (lacpdu && port) { 545 struct port_params *partner = &port->partner_oper; 546 547 __choose_matched(lacpdu, port); 548 /* record the new parameter values for the partner 549 * operational 550 */ 551 partner->port_number = ntohs(lacpdu->actor_port); 552 partner->port_priority = ntohs(lacpdu->actor_port_priority); 553 partner->system = lacpdu->actor_system; 554 partner->system_priority = ntohs(lacpdu->actor_system_priority); 555 partner->key = ntohs(lacpdu->actor_key); 556 partner->port_state = lacpdu->actor_state; 557 558 /* set actor_oper_port_state.defaulted to FALSE */ 559 port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED; 560 561 /* set the partner sync. to on if the partner is sync, 562 * and the port is matched 563 */ 564 if ((port->sm_vars & AD_PORT_MATCHED) && 565 (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) { 566 partner->port_state |= LACP_STATE_SYNCHRONIZATION; 567 slave_dbg(port->slave->bond->dev, port->slave->dev, 568 "partner sync=1\n"); 569 } else { 570 partner->port_state &= ~LACP_STATE_SYNCHRONIZATION; 571 slave_dbg(port->slave->bond->dev, port->slave->dev, 572 "partner sync=0\n"); 573 } 574 } 575} 576 577/** 578 * __record_default - record default parameters 579 * @port: the port we're looking at 580 * 581 * This function records the default parameter values for the partner carried 582 * in the Partner Admin parameters as the current partner operational parameter 583 * values and sets actor_oper_port_state.defaulted to TRUE. 584 */ 585static void __record_default(struct port *port) 586{ 587 if (port) { 588 /* record the partner admin parameters */ 589 memcpy(&port->partner_oper, &port->partner_admin, 590 sizeof(struct port_params)); 591 592 /* set actor_oper_port_state.defaulted to true */ 593 port->actor_oper_port_state |= LACP_STATE_DEFAULTED; 594 } 595} 596 597/** 598 * __update_selected - update a port's Selected variable from a received lacpdu 599 * @lacpdu: the lacpdu we've received 600 * @port: the port we're looking at 601 * 602 * Update the value of the selected variable, using parameter values from a 603 * newly received lacpdu. The parameter values for the Actor carried in the 604 * received PDU are compared with the corresponding operational parameter 605 * values for the ports partner. If one or more of the comparisons shows that 606 * the value(s) received in the PDU differ from the current operational values, 607 * then selected is set to FALSE and actor_oper_port_state.synchronization is 608 * set to out_of_sync. Otherwise, selected remains unchanged. 609 */ 610static void __update_selected(struct lacpdu *lacpdu, struct port *port) 611{ 612 if (lacpdu && port) { 613 const struct port_params *partner = &port->partner_oper; 614 615 /* check if any parameter is different then 616 * update the state machine selected variable. 617 */ 618 if (ntohs(lacpdu->actor_port) != partner->port_number || 619 ntohs(lacpdu->actor_port_priority) != partner->port_priority || 620 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) || 621 ntohs(lacpdu->actor_system_priority) != partner->system_priority || 622 ntohs(lacpdu->actor_key) != partner->key || 623 (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) { 624 port->sm_vars &= ~AD_PORT_SELECTED; 625 } 626 } 627} 628 629/** 630 * __update_default_selected - update a port's Selected variable from Partner 631 * @port: the port we're looking at 632 * 633 * This function updates the value of the selected variable, using the partner 634 * administrative parameter values. The administrative values are compared with 635 * the corresponding operational parameter values for the partner. If one or 636 * more of the comparisons shows that the administrative value(s) differ from 637 * the current operational values, then Selected is set to FALSE and 638 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise, 639 * Selected remains unchanged. 640 */ 641static void __update_default_selected(struct port *port) 642{ 643 if (port) { 644 const struct port_params *admin = &port->partner_admin; 645 const struct port_params *oper = &port->partner_oper; 646 647 /* check if any parameter is different then 648 * update the state machine selected variable. 649 */ 650 if (admin->port_number != oper->port_number || 651 admin->port_priority != oper->port_priority || 652 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) || 653 admin->system_priority != oper->system_priority || 654 admin->key != oper->key || 655 (admin->port_state & LACP_STATE_AGGREGATION) 656 != (oper->port_state & LACP_STATE_AGGREGATION)) { 657 port->sm_vars &= ~AD_PORT_SELECTED; 658 } 659 } 660} 661 662/** 663 * __update_ntt - update a port's ntt variable from a received lacpdu 664 * @lacpdu: the lacpdu we've received 665 * @port: the port we're looking at 666 * 667 * Updates the value of the ntt variable, using parameter values from a newly 668 * received lacpdu. The parameter values for the partner carried in the 669 * received PDU are compared with the corresponding operational parameter 670 * values for the Actor. If one or more of the comparisons shows that the 671 * value(s) received in the PDU differ from the current operational values, 672 * then ntt is set to TRUE. Otherwise, ntt remains unchanged. 673 */ 674static void __update_ntt(struct lacpdu *lacpdu, struct port *port) 675{ 676 /* validate lacpdu and port */ 677 if (lacpdu && port) { 678 /* check if any parameter is different then 679 * update the port->ntt. 680 */ 681 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) || 682 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) || 683 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) || 684 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) || 685 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) || 686 ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) || 687 ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) || 688 ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) || 689 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION)) 690 ) { 691 port->ntt = true; 692 } 693 } 694} 695 696/** 697 * __agg_ports_are_ready - check if all ports in an aggregator are ready 698 * @aggregator: the aggregator we're looking at 699 * 700 */ 701static int __agg_ports_are_ready(struct aggregator *aggregator) 702{ 703 struct port *port; 704 int retval = 1; 705 706 if (aggregator) { 707 /* scan all ports in this aggregator to verfy if they are 708 * all ready. 709 */ 710 for (port = aggregator->lag_ports; 711 port; 712 port = port->next_port_in_aggregator) { 713 if (!(port->sm_vars & AD_PORT_READY_N)) { 714 retval = 0; 715 break; 716 } 717 } 718 } 719 720 return retval; 721} 722 723/** 724 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator 725 * @aggregator: the aggregator we're looking at 726 * @val: Should the ports' ready bit be set on or off 727 * 728 */ 729static void __set_agg_ports_ready(struct aggregator *aggregator, int val) 730{ 731 struct port *port; 732 733 for (port = aggregator->lag_ports; port; 734 port = port->next_port_in_aggregator) { 735 if (val) 736 port->sm_vars |= AD_PORT_READY; 737 else 738 port->sm_vars &= ~AD_PORT_READY; 739 } 740} 741 742static int __agg_active_ports(struct aggregator *agg) 743{ 744 struct port *port; 745 int active = 0; 746 747 for (port = agg->lag_ports; port; 748 port = port->next_port_in_aggregator) { 749 if (port->is_enabled) 750 active++; 751 } 752 753 return active; 754} 755 756static unsigned int __agg_ports_priority(const struct aggregator *agg) 757{ 758 struct port *port = agg->lag_ports; 759 unsigned int prio = 0; 760 761 for (; port; port = port->next_port_in_aggregator) 762 if (port->is_enabled) 763 prio += port->actor_port_priority; 764 765 return prio; 766} 767 768/** 769 * __get_agg_bandwidth - get the total bandwidth of an aggregator 770 * @aggregator: the aggregator we're looking at 771 * 772 */ 773static u32 __get_agg_bandwidth(struct aggregator *aggregator) 774{ 775 int nports = __agg_active_ports(aggregator); 776 u32 bandwidth = 0; 777 778 if (nports) { 779 switch (__get_link_speed(aggregator->lag_ports)) { 780 case AD_LINK_SPEED_1MBPS: 781 bandwidth = nports; 782 break; 783 case AD_LINK_SPEED_10MBPS: 784 bandwidth = nports * 10; 785 break; 786 case AD_LINK_SPEED_100MBPS: 787 bandwidth = nports * 100; 788 break; 789 case AD_LINK_SPEED_1000MBPS: 790 bandwidth = nports * 1000; 791 break; 792 case AD_LINK_SPEED_2500MBPS: 793 bandwidth = nports * 2500; 794 break; 795 case AD_LINK_SPEED_5000MBPS: 796 bandwidth = nports * 5000; 797 break; 798 case AD_LINK_SPEED_10000MBPS: 799 bandwidth = nports * 10000; 800 break; 801 case AD_LINK_SPEED_14000MBPS: 802 bandwidth = nports * 14000; 803 break; 804 case AD_LINK_SPEED_20000MBPS: 805 bandwidth = nports * 20000; 806 break; 807 case AD_LINK_SPEED_25000MBPS: 808 bandwidth = nports * 25000; 809 break; 810 case AD_LINK_SPEED_40000MBPS: 811 bandwidth = nports * 40000; 812 break; 813 case AD_LINK_SPEED_50000MBPS: 814 bandwidth = nports * 50000; 815 break; 816 case AD_LINK_SPEED_56000MBPS: 817 bandwidth = nports * 56000; 818 break; 819 case AD_LINK_SPEED_100000MBPS: 820 bandwidth = nports * 100000; 821 break; 822 case AD_LINK_SPEED_200000MBPS: 823 bandwidth = nports * 200000; 824 break; 825 case AD_LINK_SPEED_400000MBPS: 826 bandwidth = nports * 400000; 827 break; 828 case AD_LINK_SPEED_800000MBPS: 829 bandwidth = nports * 800000; 830 break; 831 case AD_LINK_SPEED_1600000MBPS: 832 bandwidth = nports * 1600000; 833 break; 834 default: 835 bandwidth = 0; /* to silence the compiler */ 836 } 837 } 838 return bandwidth; 839} 840 841/** 842 * __get_active_agg - get the current active aggregator 843 * @aggregator: the aggregator we're looking at 844 * 845 * Caller must hold RCU lock. 846 */ 847static struct aggregator *__get_active_agg(struct aggregator *aggregator) 848{ 849 struct bonding *bond = aggregator->slave->bond; 850 struct list_head *iter; 851 struct slave *slave; 852 853 bond_for_each_slave_rcu(bond, slave, iter) 854 if (SLAVE_AD_INFO(slave)->aggregator.is_active) 855 return &(SLAVE_AD_INFO(slave)->aggregator); 856 857 return NULL; 858} 859 860/** 861 * __update_lacpdu_from_port - update a port's lacpdu fields 862 * @port: the port we're looking at 863 */ 864static inline void __update_lacpdu_from_port(struct port *port) 865{ 866 struct lacpdu *lacpdu = &port->lacpdu; 867 const struct port_params *partner = &port->partner_oper; 868 869 /* update current actual Actor parameters 870 * lacpdu->subtype initialized 871 * lacpdu->version_number initialized 872 * lacpdu->tlv_type_actor_info initialized 873 * lacpdu->actor_information_length initialized 874 */ 875 876 lacpdu->actor_system_priority = htons(port->actor_system_priority); 877 lacpdu->actor_system = port->actor_system; 878 lacpdu->actor_key = htons(port->actor_oper_port_key); 879 lacpdu->actor_port_priority = htons(port->actor_port_priority); 880 lacpdu->actor_port = htons(port->actor_port_number); 881 lacpdu->actor_state = port->actor_oper_port_state; 882 slave_dbg(port->slave->bond->dev, port->slave->dev, 883 "update lacpdu: actor port state %x\n", 884 port->actor_oper_port_state); 885 886 /* lacpdu->reserved_3_1 initialized 887 * lacpdu->tlv_type_partner_info initialized 888 * lacpdu->partner_information_length initialized 889 */ 890 891 lacpdu->partner_system_priority = htons(partner->system_priority); 892 lacpdu->partner_system = partner->system; 893 lacpdu->partner_key = htons(partner->key); 894 lacpdu->partner_port_priority = htons(partner->port_priority); 895 lacpdu->partner_port = htons(partner->port_number); 896 lacpdu->partner_state = partner->port_state; 897 898 /* lacpdu->reserved_3_2 initialized 899 * lacpdu->tlv_type_collector_info initialized 900 * lacpdu->collector_information_length initialized 901 * collector_max_delay initialized 902 * reserved_12[12] initialized 903 * tlv_type_terminator initialized 904 * terminator_length initialized 905 * reserved_50[50] initialized 906 */ 907} 908 909/* ================= main 802.3ad protocol code ========================= */ 910 911/** 912 * ad_lacpdu_send - send out a lacpdu packet on a given port 913 * @port: the port we're looking at 914 * 915 * Returns: 0 on success 916 * < 0 on error 917 */ 918static int ad_lacpdu_send(struct port *port) 919{ 920 struct slave *slave = port->slave; 921 struct sk_buff *skb; 922 struct lacpdu_header *lacpdu_header; 923 int length = sizeof(struct lacpdu_header); 924 925 skb = dev_alloc_skb(length); 926 if (!skb) 927 return -ENOMEM; 928 929 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx); 930 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx); 931 932 skb->dev = slave->dev; 933 skb_reset_mac_header(skb); 934 skb->network_header = skb->mac_header + ETH_HLEN; 935 skb->protocol = PKT_TYPE_LACPDU; 936 skb->priority = TC_PRIO_CONTROL; 937 938 lacpdu_header = skb_put(skb, length); 939 940 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr); 941 /* Note: source address is set to be the member's PERMANENT address, 942 * because we use it to identify loopback lacpdus in receive. 943 */ 944 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr); 945 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU; 946 947 lacpdu_header->lacpdu = port->lacpdu; 948 949 dev_queue_xmit(skb); 950 951 return 0; 952} 953 954/** 955 * ad_marker_send - send marker information/response on a given port 956 * @port: the port we're looking at 957 * @marker: marker data to send 958 * 959 * Returns: 0 on success 960 * < 0 on error 961 */ 962static int ad_marker_send(struct port *port, struct bond_marker *marker) 963{ 964 struct slave *slave = port->slave; 965 struct sk_buff *skb; 966 struct bond_marker_header *marker_header; 967 int length = sizeof(struct bond_marker_header); 968 969 skb = dev_alloc_skb(length + 16); 970 if (!skb) 971 return -ENOMEM; 972 973 switch (marker->tlv_type) { 974 case AD_MARKER_INFORMATION_SUBTYPE: 975 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx); 976 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx); 977 break; 978 case AD_MARKER_RESPONSE_SUBTYPE: 979 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx); 980 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx); 981 break; 982 } 983 984 skb_reserve(skb, 16); 985 986 skb->dev = slave->dev; 987 skb_reset_mac_header(skb); 988 skb->network_header = skb->mac_header + ETH_HLEN; 989 skb->protocol = PKT_TYPE_LACPDU; 990 991 marker_header = skb_put(skb, length); 992 993 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr); 994 /* Note: source address is set to be the member's PERMANENT address, 995 * because we use it to identify loopback MARKERs in receive. 996 */ 997 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr); 998 marker_header->hdr.h_proto = PKT_TYPE_LACPDU; 999 1000 marker_header->marker = *marker; 1001 1002 dev_queue_xmit(skb); 1003 1004 return 0; 1005} 1006 1007static void ad_cond_set_peer_notif(struct port *port) 1008{ 1009 struct bonding *bond = port->slave->bond; 1010 1011 if (bond->params.broadcast_neighbor && rtnl_trylock()) { 1012 bond->send_peer_notif = bond->params.num_peer_notif * 1013 max(1, bond->params.peer_notif_delay); 1014 rtnl_unlock(); 1015 } 1016} 1017 1018/** 1019 * ad_mux_machine - handle a port's mux state machine 1020 * @port: the port we're looking at 1021 * @update_slave_arr: Does slave array need update? 1022 */ 1023static void ad_mux_machine(struct port *port, bool *update_slave_arr) 1024{ 1025 struct bonding *bond = __get_bond_by_port(port); 1026 mux_states_t last_state; 1027 1028 /* keep current State Machine state to compare later if it was 1029 * changed 1030 */ 1031 last_state = port->sm_mux_state; 1032 1033 if (port->sm_vars & AD_PORT_BEGIN) { 1034 port->sm_mux_state = AD_MUX_DETACHED; 1035 } else { 1036 switch (port->sm_mux_state) { 1037 case AD_MUX_DETACHED: 1038 if ((port->sm_vars & AD_PORT_SELECTED) 1039 || (port->sm_vars & AD_PORT_STANDBY)) 1040 /* if SELECTED or STANDBY */ 1041 port->sm_mux_state = AD_MUX_WAITING; 1042 break; 1043 case AD_MUX_WAITING: 1044 /* if SELECTED == FALSE return to DETACH state */ 1045 if (!(port->sm_vars & AD_PORT_SELECTED)) { 1046 port->sm_vars &= ~AD_PORT_READY_N; 1047 /* in order to withhold the Selection Logic to 1048 * check all ports READY_N value every callback 1049 * cycle to update ready variable, we check 1050 * READY_N and update READY here 1051 */ 1052 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 1053 port->sm_mux_state = AD_MUX_DETACHED; 1054 break; 1055 } 1056 1057 /* check if the wait_while_timer expired */ 1058 if (port->sm_mux_timer_counter 1059 && !(--port->sm_mux_timer_counter)) 1060 port->sm_vars |= AD_PORT_READY_N; 1061 1062 /* in order to withhold the selection logic to check 1063 * all ports READY_N value every callback cycle to 1064 * update ready variable, we check READY_N and update 1065 * READY here 1066 */ 1067 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 1068 1069 /* if the wait_while_timer expired, and the port is 1070 * in READY state, move to ATTACHED state 1071 */ 1072 if ((port->sm_vars & AD_PORT_READY) 1073 && !port->sm_mux_timer_counter) 1074 port->sm_mux_state = AD_MUX_ATTACHED; 1075 break; 1076 case AD_MUX_ATTACHED: 1077 /* check also if agg_select_timer expired (so the 1078 * edable port will take place only after this timer) 1079 */ 1080 if ((port->sm_vars & AD_PORT_SELECTED) && 1081 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) && 1082 !__check_agg_selection_timer(port)) { 1083 if (port->aggregator->is_active) { 1084 int state = AD_MUX_COLLECTING_DISTRIBUTING; 1085 1086 if (!bond->params.coupled_control) 1087 state = AD_MUX_COLLECTING; 1088 port->sm_mux_state = state; 1089 } 1090 } else if (!(port->sm_vars & AD_PORT_SELECTED) || 1091 (port->sm_vars & AD_PORT_STANDBY)) { 1092 /* if UNSELECTED or STANDBY */ 1093 port->sm_vars &= ~AD_PORT_READY_N; 1094 /* in order to withhold the selection logic to 1095 * check all ports READY_N value every callback 1096 * cycle to update ready variable, we check 1097 * READY_N and update READY here 1098 */ 1099 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 1100 port->sm_mux_state = AD_MUX_DETACHED; 1101 } else if (port->aggregator->is_active) { 1102 port->actor_oper_port_state |= 1103 LACP_STATE_SYNCHRONIZATION; 1104 } 1105 break; 1106 case AD_MUX_COLLECTING_DISTRIBUTING: 1107 if (!__port_move_to_attached_state(port)) { 1108 /* if port state hasn't changed make 1109 * sure that a collecting distributing 1110 * port in an active aggregator is enabled 1111 */ 1112 if (port->aggregator->is_active && 1113 !__port_is_collecting_distributing(port)) { 1114 __enable_port(port); 1115 *update_slave_arr = true; 1116 } 1117 } 1118 break; 1119 case AD_MUX_COLLECTING: 1120 if (!__port_move_to_attached_state(port)) { 1121 if ((port->sm_vars & AD_PORT_SELECTED) && 1122 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) && 1123 (port->partner_oper.port_state & LACP_STATE_COLLECTING)) { 1124 port->sm_mux_state = AD_MUX_DISTRIBUTING; 1125 } else { 1126 /* If port state hasn't changed, make sure that a collecting 1127 * port is enabled for an active aggregator. 1128 */ 1129 struct slave *slave = port->slave; 1130 1131 if (port->aggregator->is_active && 1132 bond_is_slave_rx_disabled(slave)) { 1133 ad_enable_collecting(port); 1134 *update_slave_arr = true; 1135 } 1136 } 1137 } 1138 break; 1139 case AD_MUX_DISTRIBUTING: 1140 if (!(port->sm_vars & AD_PORT_SELECTED) || 1141 (port->sm_vars & AD_PORT_STANDBY) || 1142 !(port->partner_oper.port_state & LACP_STATE_COLLECTING) || 1143 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) || 1144 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) { 1145 port->sm_mux_state = AD_MUX_COLLECTING; 1146 } else { 1147 /* if port state hasn't changed make 1148 * sure that a collecting distributing 1149 * port in an active aggregator is enabled 1150 */ 1151 if (port->aggregator && 1152 port->aggregator->is_active && 1153 !__port_is_collecting_distributing(port)) { 1154 __enable_port(port); 1155 *update_slave_arr = true; 1156 } 1157 } 1158 break; 1159 default: 1160 break; 1161 } 1162 } 1163 1164 /* check if the state machine was changed */ 1165 if (port->sm_mux_state != last_state) { 1166 slave_dbg(port->slave->bond->dev, port->slave->dev, 1167 "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", 1168 port->actor_port_number, 1169 last_state, 1170 port->sm_mux_state); 1171 switch (port->sm_mux_state) { 1172 case AD_MUX_DETACHED: 1173 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; 1174 ad_disable_collecting_distributing(port, 1175 update_slave_arr); 1176 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; 1177 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 1178 port->ntt = true; 1179 break; 1180 case AD_MUX_WAITING: 1181 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0); 1182 break; 1183 case AD_MUX_ATTACHED: 1184 if (port->aggregator->is_active) 1185 port->actor_oper_port_state |= 1186 LACP_STATE_SYNCHRONIZATION; 1187 else 1188 port->actor_oper_port_state &= 1189 ~LACP_STATE_SYNCHRONIZATION; 1190 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; 1191 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 1192 ad_disable_collecting_distributing(port, 1193 update_slave_arr); 1194 port->ntt = true; 1195 break; 1196 case AD_MUX_COLLECTING_DISTRIBUTING: 1197 port->actor_oper_port_state |= LACP_STATE_COLLECTING; 1198 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING; 1199 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION; 1200 ad_enable_collecting_distributing(port, 1201 update_slave_arr); 1202 port->ntt = true; 1203 break; 1204 case AD_MUX_COLLECTING: 1205 port->actor_oper_port_state |= LACP_STATE_COLLECTING; 1206 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 1207 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION; 1208 ad_enable_collecting(port); 1209 ad_disable_distributing(port, update_slave_arr); 1210 port->ntt = true; 1211 break; 1212 case AD_MUX_DISTRIBUTING: 1213 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING; 1214 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION; 1215 ad_enable_collecting_distributing(port, 1216 update_slave_arr); 1217 break; 1218 default: 1219 break; 1220 } 1221 } 1222} 1223 1224/** 1225 * ad_rx_machine - handle a port's rx State Machine 1226 * @lacpdu: the lacpdu we've received 1227 * @port: the port we're looking at 1228 * 1229 * If lacpdu arrived, stop previous timer (if exists) and set the next state as 1230 * CURRENT. If timer expired set the state machine in the proper state. 1231 * In other cases, this function checks if we need to switch to other state. 1232 */ 1233static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port) 1234{ 1235 rx_states_t last_state; 1236 1237 /* keep current State Machine state to compare later if it was 1238 * changed 1239 */ 1240 last_state = port->sm_rx_state; 1241 1242 if (lacpdu) { 1243 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx); 1244 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx); 1245 } 1246 /* check if state machine should change state */ 1247 1248 /* first, check if port was reinitialized */ 1249 if (port->sm_vars & AD_PORT_BEGIN) { 1250 port->sm_rx_state = AD_RX_INITIALIZE; 1251 port->sm_vars |= AD_PORT_CHURNED; 1252 /* check if port is not enabled */ 1253 } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled) 1254 port->sm_rx_state = AD_RX_PORT_DISABLED; 1255 /* check if new lacpdu arrived */ 1256 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || 1257 (port->sm_rx_state == AD_RX_DEFAULTED) || 1258 (port->sm_rx_state == AD_RX_CURRENT))) { 1259 if (port->sm_rx_state != AD_RX_CURRENT) 1260 port->sm_vars |= AD_PORT_CHURNED; 1261 port->sm_rx_timer_counter = 0; 1262 port->sm_rx_state = AD_RX_CURRENT; 1263 } else { 1264 /* if timer is on, and if it is expired */ 1265 if (port->sm_rx_timer_counter && 1266 !(--port->sm_rx_timer_counter)) { 1267 switch (port->sm_rx_state) { 1268 case AD_RX_EXPIRED: 1269 port->sm_rx_state = AD_RX_DEFAULTED; 1270 break; 1271 case AD_RX_CURRENT: 1272 port->sm_rx_state = AD_RX_EXPIRED; 1273 break; 1274 default: 1275 break; 1276 } 1277 } else { 1278 /* if no lacpdu arrived and no timer is on */ 1279 switch (port->sm_rx_state) { 1280 case AD_RX_PORT_DISABLED: 1281 if (port->is_enabled && 1282 (port->sm_vars & AD_PORT_LACP_ENABLED)) 1283 port->sm_rx_state = AD_RX_EXPIRED; 1284 else if (port->is_enabled 1285 && ((port->sm_vars 1286 & AD_PORT_LACP_ENABLED) == 0)) 1287 port->sm_rx_state = AD_RX_LACP_DISABLED; 1288 break; 1289 default: 1290 break; 1291 1292 } 1293 } 1294 } 1295 1296 /* check if the State machine was changed or new lacpdu arrived */ 1297 if ((port->sm_rx_state != last_state) || (lacpdu)) { 1298 slave_dbg(port->slave->bond->dev, port->slave->dev, 1299 "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", 1300 port->actor_port_number, 1301 last_state, 1302 port->sm_rx_state); 1303 switch (port->sm_rx_state) { 1304 case AD_RX_INITIALIZE: 1305 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)) 1306 port->sm_vars &= ~AD_PORT_LACP_ENABLED; 1307 else 1308 port->sm_vars |= AD_PORT_LACP_ENABLED; 1309 port->sm_vars &= ~AD_PORT_SELECTED; 1310 __record_default(port); 1311 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1312 port->sm_rx_state = AD_RX_PORT_DISABLED; 1313 1314 fallthrough; 1315 case AD_RX_PORT_DISABLED: 1316 port->sm_vars &= ~AD_PORT_MATCHED; 1317 break; 1318 case AD_RX_LACP_DISABLED: 1319 port->sm_vars &= ~AD_PORT_SELECTED; 1320 __record_default(port); 1321 port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION; 1322 port->sm_vars |= AD_PORT_MATCHED; 1323 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1324 break; 1325 case AD_RX_EXPIRED: 1326 /* Reset of the Synchronization flag (Standard 43.4.12) 1327 * This reset cause to disable this port in the 1328 * COLLECTING_DISTRIBUTING state of the mux machine in 1329 * case of EXPIRED even if LINK_DOWN didn't arrive for 1330 * the port. 1331 */ 1332 port->sm_vars &= ~AD_PORT_MATCHED; 1333 /* Based on IEEE 8021AX-2014, Figure 6-18 - Receive 1334 * machine state diagram, the statue should be 1335 * Partner_Oper_Port_State.Synchronization = FALSE; 1336 * Partner_Oper_Port_State.LACP_Timeout = Short Timeout; 1337 * start current_while_timer(Short Timeout); 1338 * Actor_Oper_Port_State.Expired = TRUE; 1339 */ 1340 port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION; 1341 port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT; 1342 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT)); 1343 port->actor_oper_port_state |= LACP_STATE_EXPIRED; 1344 port->sm_vars |= AD_PORT_CHURNED; 1345 break; 1346 case AD_RX_DEFAULTED: 1347 __update_default_selected(port); 1348 __record_default(port); 1349 port->sm_vars |= AD_PORT_MATCHED; 1350 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1351 break; 1352 case AD_RX_CURRENT: 1353 /* detect loopback situation */ 1354 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system), 1355 &(port->actor_system))) { 1356 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n" 1357 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n"); 1358 return; 1359 } 1360 __update_selected(lacpdu, port); 1361 __update_ntt(lacpdu, port); 1362 __record_pdu(lacpdu, port); 1363 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)); 1364 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1365 break; 1366 default: 1367 break; 1368 } 1369 } 1370} 1371 1372/** 1373 * ad_churn_machine - handle port churn's state machine 1374 * @port: the port we're looking at 1375 * 1376 */ 1377static void ad_churn_machine(struct port *port) 1378{ 1379 if (port->sm_vars & AD_PORT_CHURNED) { 1380 port->sm_vars &= ~AD_PORT_CHURNED; 1381 port->sm_churn_actor_state = AD_CHURN_MONITOR; 1382 port->sm_churn_partner_state = AD_CHURN_MONITOR; 1383 port->sm_churn_actor_timer_counter = 1384 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0); 1385 port->sm_churn_partner_timer_counter = 1386 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0); 1387 return; 1388 } 1389 if (port->sm_churn_actor_timer_counter && 1390 !(--port->sm_churn_actor_timer_counter) && 1391 port->sm_churn_actor_state == AD_CHURN_MONITOR) { 1392 if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) { 1393 port->sm_churn_actor_state = AD_NO_CHURN; 1394 } else { 1395 port->churn_actor_count++; 1396 port->sm_churn_actor_state = AD_CHURN; 1397 } 1398 } 1399 if (port->sm_churn_partner_timer_counter && 1400 !(--port->sm_churn_partner_timer_counter) && 1401 port->sm_churn_partner_state == AD_CHURN_MONITOR) { 1402 if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) { 1403 port->sm_churn_partner_state = AD_NO_CHURN; 1404 } else { 1405 port->churn_partner_count++; 1406 port->sm_churn_partner_state = AD_CHURN; 1407 } 1408 } 1409} 1410 1411/** 1412 * ad_tx_machine - handle a port's tx state machine 1413 * @port: the port we're looking at 1414 */ 1415static void ad_tx_machine(struct port *port) 1416{ 1417 /* check if tx timer expired, to verify that we do not send more than 1418 * 3 packets per second 1419 */ 1420 if (!port->sm_tx_timer_counter || !(--port->sm_tx_timer_counter)) { 1421 /* check if there is something to send */ 1422 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) { 1423 __update_lacpdu_from_port(port); 1424 1425 if (ad_lacpdu_send(port) >= 0) { 1426 slave_dbg(port->slave->bond->dev, 1427 port->slave->dev, 1428 "Sent LACPDU on port %d\n", 1429 port->actor_port_number); 1430 1431 /* mark ntt as false, so it will not be sent 1432 * again until demanded 1433 */ 1434 port->ntt = false; 1435 1436 /* restart tx timer(to verify that we will not 1437 * exceed AD_MAX_TX_IN_SECOND 1438 */ 1439 port->sm_tx_timer_counter = ad_ticks_per_sec / AD_MAX_TX_IN_SECOND; 1440 } 1441 } 1442 } 1443} 1444 1445/** 1446 * ad_periodic_machine - handle a port's periodic state machine 1447 * @port: the port we're looking at 1448 * 1449 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's. 1450 */ 1451static void ad_periodic_machine(struct port *port) 1452{ 1453 periodic_states_t last_state; 1454 1455 /* keep current state machine state to compare later if it was changed */ 1456 last_state = port->sm_periodic_state; 1457 1458 /* check if port was reinitialized */ 1459 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) || 1460 (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY))) { 1461 port->sm_periodic_state = AD_NO_PERIODIC; 1462 } 1463 /* check if state machine should change state */ 1464 else if (port->sm_periodic_timer_counter) { 1465 /* check if periodic state machine expired */ 1466 if (!(--port->sm_periodic_timer_counter)) { 1467 /* if expired then do tx */ 1468 port->sm_periodic_state = AD_PERIODIC_TX; 1469 } else { 1470 /* If not expired, check if there is some new timeout 1471 * parameter from the partner state 1472 */ 1473 switch (port->sm_periodic_state) { 1474 case AD_FAST_PERIODIC: 1475 if (!(port->partner_oper.port_state 1476 & LACP_STATE_LACP_TIMEOUT)) 1477 port->sm_periodic_state = AD_SLOW_PERIODIC; 1478 break; 1479 case AD_SLOW_PERIODIC: 1480 if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) { 1481 port->sm_periodic_timer_counter = 0; 1482 port->sm_periodic_state = AD_PERIODIC_TX; 1483 } 1484 break; 1485 default: 1486 break; 1487 } 1488 } 1489 } else { 1490 switch (port->sm_periodic_state) { 1491 case AD_NO_PERIODIC: 1492 port->sm_periodic_state = AD_FAST_PERIODIC; 1493 break; 1494 case AD_PERIODIC_TX: 1495 if (!(port->partner_oper.port_state & 1496 LACP_STATE_LACP_TIMEOUT)) 1497 port->sm_periodic_state = AD_SLOW_PERIODIC; 1498 else 1499 port->sm_periodic_state = AD_FAST_PERIODIC; 1500 break; 1501 default: 1502 break; 1503 } 1504 } 1505 1506 /* check if the state machine was changed */ 1507 if (port->sm_periodic_state != last_state) { 1508 slave_dbg(port->slave->bond->dev, port->slave->dev, 1509 "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", 1510 port->actor_port_number, last_state, 1511 port->sm_periodic_state); 1512 switch (port->sm_periodic_state) { 1513 case AD_NO_PERIODIC: 1514 port->sm_periodic_timer_counter = 0; 1515 break; 1516 case AD_FAST_PERIODIC: 1517 /* decrement 1 tick we lost in the PERIODIC_TX cycle */ 1518 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; 1519 break; 1520 case AD_SLOW_PERIODIC: 1521 /* decrement 1 tick we lost in the PERIODIC_TX cycle */ 1522 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; 1523 break; 1524 case AD_PERIODIC_TX: 1525 port->ntt = true; 1526 break; 1527 default: 1528 break; 1529 } 1530 } 1531} 1532 1533/** 1534 * ad_port_selection_logic - select aggregation groups 1535 * @port: the port we're looking at 1536 * @update_slave_arr: Does slave array need update? 1537 * 1538 * Select aggregation groups, and assign each port for it's aggregetor. The 1539 * selection logic is called in the inititalization (after all the handshkes), 1540 * and after every lacpdu receive (if selected is off). 1541 */ 1542static void ad_port_selection_logic(struct port *port, bool *update_slave_arr) 1543{ 1544 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator; 1545 struct port *last_port = NULL, *curr_port; 1546 struct list_head *iter; 1547 struct bonding *bond; 1548 struct slave *slave; 1549 int found = 0; 1550 1551 /* if the port is already Selected, do nothing */ 1552 if (port->sm_vars & AD_PORT_SELECTED) 1553 return; 1554 1555 bond = __get_bond_by_port(port); 1556 1557 /* if the port is connected to other aggregator, detach it */ 1558 if (port->aggregator) { 1559 /* detach the port from its former aggregator */ 1560 temp_aggregator = port->aggregator; 1561 for (curr_port = temp_aggregator->lag_ports; curr_port; 1562 last_port = curr_port, 1563 curr_port = curr_port->next_port_in_aggregator) { 1564 if (curr_port == port) { 1565 temp_aggregator->num_of_ports--; 1566 /* if it is the first port attached to the 1567 * aggregator 1568 */ 1569 if (!last_port) { 1570 temp_aggregator->lag_ports = 1571 port->next_port_in_aggregator; 1572 } else { 1573 /* not the first port attached to the 1574 * aggregator 1575 */ 1576 last_port->next_port_in_aggregator = 1577 port->next_port_in_aggregator; 1578 } 1579 1580 /* clear the port's relations to this 1581 * aggregator 1582 */ 1583 port->aggregator = NULL; 1584 port->next_port_in_aggregator = NULL; 1585 port->actor_port_aggregator_identifier = 0; 1586 1587 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n", 1588 port->actor_port_number, 1589 temp_aggregator->aggregator_identifier); 1590 /* if the aggregator is empty, clear its 1591 * parameters, and set it ready to be attached 1592 */ 1593 if (!temp_aggregator->lag_ports) 1594 ad_clear_agg(temp_aggregator); 1595 break; 1596 } 1597 } 1598 if (!curr_port) { 1599 /* meaning: the port was related to an aggregator 1600 * but was not on the aggregator port list 1601 */ 1602 net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n", 1603 port->slave->bond->dev->name, 1604 port->slave->dev->name, 1605 port->actor_port_number, 1606 port->aggregator->aggregator_identifier); 1607 } 1608 } 1609 /* search on all aggregators for a suitable aggregator for this port */ 1610 bond_for_each_slave(bond, slave, iter) { 1611 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 1612 1613 /* keep a free aggregator for later use(if needed) */ 1614 if (!aggregator->lag_ports) { 1615 if (!free_aggregator) 1616 free_aggregator = aggregator; 1617 continue; 1618 } 1619 /* check if current aggregator suits us */ 1620 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */ 1621 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) && 1622 (aggregator->partner_system_priority == port->partner_oper.system_priority) && 1623 (aggregator->partner_oper_aggregator_key == port->partner_oper.key) 1624 ) && 1625 ((__agg_has_partner(aggregator) && /* partner answers */ 1626 !aggregator->is_individual) /* but is not individual OR */ 1627 ) 1628 ) { 1629 /* attach to the founded aggregator */ 1630 port->aggregator = aggregator; 1631 port->actor_port_aggregator_identifier = 1632 port->aggregator->aggregator_identifier; 1633 port->next_port_in_aggregator = aggregator->lag_ports; 1634 port->aggregator->num_of_ports++; 1635 aggregator->lag_ports = port; 1636 slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n", 1637 port->actor_port_number, 1638 port->aggregator->aggregator_identifier); 1639 1640 /* mark this port as selected */ 1641 port->sm_vars |= AD_PORT_SELECTED; 1642 found = 1; 1643 break; 1644 } 1645 } 1646 1647 /* the port couldn't find an aggregator - attach it to a new 1648 * aggregator 1649 */ 1650 if (!found) { 1651 if (free_aggregator) { 1652 /* assign port a new aggregator */ 1653 port->aggregator = free_aggregator; 1654 port->actor_port_aggregator_identifier = 1655 port->aggregator->aggregator_identifier; 1656 1657 /* update the new aggregator's parameters 1658 * if port was responsed from the end-user 1659 */ 1660 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS) 1661 /* if port is full duplex */ 1662 port->aggregator->is_individual = false; 1663 else 1664 port->aggregator->is_individual = true; 1665 1666 port->aggregator->actor_admin_aggregator_key = 1667 port->actor_admin_port_key; 1668 port->aggregator->actor_oper_aggregator_key = 1669 port->actor_oper_port_key; 1670 port->aggregator->partner_system = 1671 port->partner_oper.system; 1672 port->aggregator->partner_system_priority = 1673 port->partner_oper.system_priority; 1674 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key; 1675 port->aggregator->receive_state = 1; 1676 port->aggregator->transmit_state = 1; 1677 port->aggregator->lag_ports = port; 1678 port->aggregator->num_of_ports++; 1679 1680 /* mark this port as selected */ 1681 port->sm_vars |= AD_PORT_SELECTED; 1682 1683 slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n", 1684 port->actor_port_number, 1685 port->aggregator->aggregator_identifier); 1686 } else { 1687 slave_err(bond->dev, port->slave->dev, 1688 "Port %d did not find a suitable aggregator\n", 1689 port->actor_port_number); 1690 return; 1691 } 1692 } 1693 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE 1694 * in all aggregator's ports, else set ready=FALSE in all 1695 * aggregator's ports 1696 */ 1697 __set_agg_ports_ready(port->aggregator, 1698 __agg_ports_are_ready(port->aggregator)); 1699 1700 aggregator = __get_first_agg(port); 1701 ad_agg_selection_logic(aggregator, update_slave_arr); 1702 1703 if (!port->aggregator->is_active) 1704 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; 1705} 1706 1707/* Decide if "agg" is a better choice for the new active aggregator that 1708 * the current best, according to the ad_select policy. 1709 */ 1710static struct aggregator *ad_agg_selection_test(struct aggregator *best, 1711 struct aggregator *curr) 1712{ 1713 /* 0. If no best, select current. 1714 * 1715 * 1. If the current agg is not individual, and the best is 1716 * individual, select current. 1717 * 1718 * 2. If current agg is individual and the best is not, keep best. 1719 * 1720 * 3. Therefore, current and best are both individual or both not 1721 * individual, so: 1722 * 1723 * 3a. If current agg partner replied, and best agg partner did not, 1724 * select current. 1725 * 1726 * 3b. If current agg partner did not reply and best agg partner 1727 * did reply, keep best. 1728 * 1729 * 4. Therefore, current and best both have partner replies or 1730 * both do not, so perform selection policy: 1731 * 1732 * BOND_AD_PRIO: Select by total priority of ports. If priority 1733 * is equal, select by count. 1734 * 1735 * BOND_AD_COUNT: Select by count of ports. If count is equal, 1736 * select by bandwidth. 1737 * 1738 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth. 1739 */ 1740 if (!best) 1741 return curr; 1742 1743 if (!curr->is_individual && best->is_individual) 1744 return curr; 1745 1746 if (curr->is_individual && !best->is_individual) 1747 return best; 1748 1749 if (__agg_has_partner(curr) && !__agg_has_partner(best)) 1750 return curr; 1751 1752 if (!__agg_has_partner(curr) && __agg_has_partner(best)) 1753 return best; 1754 1755 switch (__get_agg_selection_mode(curr->lag_ports)) { 1756 case BOND_AD_PRIO: 1757 if (__agg_ports_priority(curr) > __agg_ports_priority(best)) 1758 return curr; 1759 1760 if (__agg_ports_priority(curr) < __agg_ports_priority(best)) 1761 return best; 1762 1763 fallthrough; 1764 case BOND_AD_COUNT: 1765 if (__agg_active_ports(curr) > __agg_active_ports(best)) 1766 return curr; 1767 1768 if (__agg_active_ports(curr) < __agg_active_ports(best)) 1769 return best; 1770 1771 fallthrough; 1772 case BOND_AD_STABLE: 1773 case BOND_AD_BANDWIDTH: 1774 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best)) 1775 return curr; 1776 1777 break; 1778 1779 default: 1780 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n", 1781 curr->slave->bond->dev->name, 1782 curr->slave->dev->name, 1783 __get_agg_selection_mode(curr->lag_ports)); 1784 break; 1785 } 1786 1787 return best; 1788} 1789 1790static int agg_device_up(const struct aggregator *agg) 1791{ 1792 struct port *port = agg->lag_ports; 1793 1794 if (!port) 1795 return 0; 1796 1797 for (port = agg->lag_ports; port; 1798 port = port->next_port_in_aggregator) { 1799 if (netif_running(port->slave->dev) && 1800 netif_carrier_ok(port->slave->dev)) 1801 return 1; 1802 } 1803 1804 return 0; 1805} 1806 1807/** 1808 * ad_agg_selection_logic - select an aggregation group for a team 1809 * @agg: the aggregator we're looking at 1810 * @update_slave_arr: Does slave array need update? 1811 * 1812 * It is assumed that only one aggregator may be selected for a team. 1813 * 1814 * The logic of this function is to select the aggregator according to 1815 * the ad_select policy: 1816 * 1817 * BOND_AD_STABLE: select the aggregator with the most ports attached to 1818 * it, and to reselect the active aggregator only if the previous 1819 * aggregator has no more ports related to it. 1820 * 1821 * BOND_AD_BANDWIDTH: select the aggregator with the highest total 1822 * bandwidth, and reselect whenever a link state change takes place or the 1823 * set of slaves in the bond changes. 1824 * 1825 * BOND_AD_COUNT: select the aggregator with largest number of ports 1826 * (slaves), and reselect whenever a link state change takes place or the 1827 * set of slaves in the bond changes. 1828 * 1829 * BOND_AD_PRIO: select the aggregator with highest total priority of ports 1830 * (slaves), and reselect whenever a link state change takes place or the 1831 * set of slaves in the bond changes. 1832 * 1833 * FIXME: this function MUST be called with the first agg in the bond, or 1834 * __get_active_agg() won't work correctly. This function should be better 1835 * called with the bond itself, and retrieve the first agg from it. 1836 */ 1837static void ad_agg_selection_logic(struct aggregator *agg, 1838 bool *update_slave_arr) 1839{ 1840 struct aggregator *best, *active, *origin; 1841 struct bonding *bond = agg->slave->bond; 1842 struct list_head *iter; 1843 struct slave *slave; 1844 struct port *port; 1845 1846 rcu_read_lock(); 1847 origin = agg; 1848 active = __get_active_agg(agg); 1849 best = (active && agg_device_up(active)) ? active : NULL; 1850 1851 bond_for_each_slave_rcu(bond, slave, iter) { 1852 agg = &(SLAVE_AD_INFO(slave)->aggregator); 1853 1854 agg->is_active = 0; 1855 1856 if (__agg_active_ports(agg) && agg_device_up(agg)) 1857 best = ad_agg_selection_test(best, agg); 1858 } 1859 1860 if (best && 1861 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) { 1862 /* For the STABLE policy, don't replace the old active 1863 * aggregator if it's still active (it has an answering 1864 * partner) or if both the best and active don't have an 1865 * answering partner. 1866 */ 1867 if (active && active->lag_ports && 1868 __agg_active_ports(active) && 1869 (__agg_has_partner(active) || 1870 (!__agg_has_partner(active) && 1871 !__agg_has_partner(best)))) { 1872 if (!(!active->actor_oper_aggregator_key && 1873 best->actor_oper_aggregator_key)) { 1874 best = NULL; 1875 active->is_active = 1; 1876 } 1877 } 1878 } 1879 1880 if (best && (best == active)) { 1881 best = NULL; 1882 active->is_active = 1; 1883 } 1884 1885 /* if there is new best aggregator, activate it */ 1886 if (best) { 1887 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1888 best->slave ? best->slave->dev->name : "NULL", 1889 best->aggregator_identifier, best->num_of_ports, 1890 best->actor_oper_aggregator_key, 1891 best->partner_oper_aggregator_key, 1892 best->is_individual, best->is_active); 1893 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n", 1894 best->slave ? best->slave->dev->name : "NULL", 1895 best->lag_ports, best->slave); 1896 1897 bond_for_each_slave_rcu(bond, slave, iter) { 1898 agg = &(SLAVE_AD_INFO(slave)->aggregator); 1899 1900 slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1901 agg->aggregator_identifier, agg->num_of_ports, 1902 agg->actor_oper_aggregator_key, 1903 agg->partner_oper_aggregator_key, 1904 agg->is_individual, agg->is_active); 1905 } 1906 1907 /* check if any partner replies */ 1908 if (best->is_individual) 1909 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n", 1910 bond->dev->name); 1911 1912 best->is_active = 1; 1913 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n", 1914 best->slave ? best->slave->dev->name : "NULL", 1915 best->aggregator_identifier); 1916 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1917 best->slave ? best->slave->dev->name : "NULL", 1918 best->aggregator_identifier, best->num_of_ports, 1919 best->actor_oper_aggregator_key, 1920 best->partner_oper_aggregator_key, 1921 best->is_individual, best->is_active); 1922 1923 /* disable the ports that were related to the former 1924 * active_aggregator 1925 */ 1926 if (active) { 1927 for (port = active->lag_ports; port; 1928 port = port->next_port_in_aggregator) { 1929 __disable_port(port); 1930 } 1931 } 1932 /* Slave array needs update. */ 1933 *update_slave_arr = true; 1934 } 1935 1936 /* if the selected aggregator is of join individuals 1937 * (partner_system is NULL), enable their ports 1938 */ 1939 active = __get_active_agg(origin); 1940 1941 if (active) { 1942 if (!__agg_has_partner(active)) { 1943 for (port = active->lag_ports; port; 1944 port = port->next_port_in_aggregator) { 1945 __enable_port(port); 1946 } 1947 *update_slave_arr = true; 1948 } 1949 } 1950 1951 rcu_read_unlock(); 1952 1953 bond_3ad_set_carrier(bond); 1954} 1955 1956/** 1957 * ad_clear_agg - clear a given aggregator's parameters 1958 * @aggregator: the aggregator we're looking at 1959 */ 1960static void ad_clear_agg(struct aggregator *aggregator) 1961{ 1962 if (aggregator) { 1963 aggregator->is_individual = false; 1964 aggregator->actor_admin_aggregator_key = 0; 1965 aggregator->actor_oper_aggregator_key = 0; 1966 eth_zero_addr(aggregator->partner_system.mac_addr_value); 1967 aggregator->partner_system_priority = 0; 1968 aggregator->partner_oper_aggregator_key = 0; 1969 aggregator->receive_state = 0; 1970 aggregator->transmit_state = 0; 1971 aggregator->lag_ports = NULL; 1972 aggregator->is_active = 0; 1973 aggregator->num_of_ports = 0; 1974 pr_debug("%s: LAG %d was cleared\n", 1975 aggregator->slave ? 1976 aggregator->slave->dev->name : "NULL", 1977 aggregator->aggregator_identifier); 1978 } 1979} 1980 1981/** 1982 * ad_initialize_agg - initialize a given aggregator's parameters 1983 * @aggregator: the aggregator we're looking at 1984 */ 1985static void ad_initialize_agg(struct aggregator *aggregator) 1986{ 1987 if (aggregator) { 1988 ad_clear_agg(aggregator); 1989 1990 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value); 1991 aggregator->aggregator_identifier = 0; 1992 aggregator->slave = NULL; 1993 } 1994} 1995 1996/** 1997 * ad_initialize_port - initialize a given port's parameters 1998 * @port: the port we're looking at 1999 * @bond_params: bond parameters we will use 2000 */ 2001static void ad_initialize_port(struct port *port, const struct bond_params *bond_params) 2002{ 2003 static const struct port_params tmpl = { 2004 .system_priority = 0xffff, 2005 .key = 1, 2006 .port_number = 1, 2007 .port_priority = 0xff, 2008 .port_state = 0, 2009 }; 2010 static const struct lacpdu lacpdu = { 2011 .subtype = 0x01, 2012 .version_number = 0x01, 2013 .tlv_type_actor_info = 0x01, 2014 .actor_information_length = 0x14, 2015 .tlv_type_partner_info = 0x02, 2016 .partner_information_length = 0x14, 2017 .tlv_type_collector_info = 0x03, 2018 .collector_information_length = 0x10, 2019 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY), 2020 }; 2021 2022 if (port) { 2023 port->actor_port_priority = 0xff; 2024 port->actor_port_aggregator_identifier = 0; 2025 port->ntt = false; 2026 port->actor_admin_port_state = LACP_STATE_AGGREGATION; 2027 port->actor_oper_port_state = LACP_STATE_AGGREGATION; 2028 if (bond_params->lacp_active) { 2029 port->actor_admin_port_state |= LACP_STATE_LACP_ACTIVITY; 2030 port->actor_oper_port_state |= LACP_STATE_LACP_ACTIVITY; 2031 } 2032 2033 if (bond_params->lacp_fast) 2034 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT; 2035 2036 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl)); 2037 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl)); 2038 2039 port->is_enabled = true; 2040 /* private parameters */ 2041 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED; 2042 port->sm_rx_state = 0; 2043 port->sm_rx_timer_counter = 0; 2044 port->sm_periodic_state = 0; 2045 port->sm_periodic_timer_counter = 0; 2046 port->sm_mux_state = 0; 2047 port->sm_mux_timer_counter = 0; 2048 port->sm_tx_state = 0; 2049 port->aggregator = NULL; 2050 port->next_port_in_aggregator = NULL; 2051 port->transaction_id = 0; 2052 2053 port->sm_churn_actor_timer_counter = 0; 2054 port->sm_churn_actor_state = 0; 2055 port->churn_actor_count = 0; 2056 port->sm_churn_partner_timer_counter = 0; 2057 port->sm_churn_partner_state = 0; 2058 port->churn_partner_count = 0; 2059 2060 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu)); 2061 } 2062} 2063 2064/** 2065 * ad_enable_collecting - enable a port's receive 2066 * @port: the port we're looking at 2067 * 2068 * Enable @port if it's in an active aggregator 2069 */ 2070static void ad_enable_collecting(struct port *port) 2071{ 2072 if (port->aggregator->is_active) { 2073 struct slave *slave = port->slave; 2074 2075 slave_dbg(slave->bond->dev, slave->dev, 2076 "Enabling collecting on port %d (LAG %d)\n", 2077 port->actor_port_number, 2078 port->aggregator->aggregator_identifier); 2079 __enable_collecting_port(port); 2080 } 2081} 2082 2083/** 2084 * ad_disable_distributing - disable a port's transmit 2085 * @port: the port we're looking at 2086 * @update_slave_arr: Does slave array need update? 2087 */ 2088static void ad_disable_distributing(struct port *port, bool *update_slave_arr) 2089{ 2090 if (port->aggregator && __agg_has_partner(port->aggregator)) { 2091 slave_dbg(port->slave->bond->dev, port->slave->dev, 2092 "Disabling distributing on port %d (LAG %d)\n", 2093 port->actor_port_number, 2094 port->aggregator->aggregator_identifier); 2095 __disable_distributing_port(port); 2096 /* Slave array needs an update */ 2097 *update_slave_arr = true; 2098 } 2099} 2100 2101/** 2102 * ad_enable_collecting_distributing - enable a port's transmit/receive 2103 * @port: the port we're looking at 2104 * @update_slave_arr: Does slave array need update? 2105 * 2106 * Enable @port if it's in an active aggregator 2107 */ 2108static void ad_enable_collecting_distributing(struct port *port, 2109 bool *update_slave_arr) 2110{ 2111 if (port->aggregator->is_active) { 2112 slave_dbg(port->slave->bond->dev, port->slave->dev, 2113 "Enabling port %d (LAG %d)\n", 2114 port->actor_port_number, 2115 port->aggregator->aggregator_identifier); 2116 __enable_port(port); 2117 /* Slave array needs update */ 2118 *update_slave_arr = true; 2119 /* Should notify peers if possible */ 2120 ad_cond_set_peer_notif(port); 2121 } 2122} 2123 2124/** 2125 * ad_disable_collecting_distributing - disable a port's transmit/receive 2126 * @port: the port we're looking at 2127 * @update_slave_arr: Does slave array need update? 2128 */ 2129static void ad_disable_collecting_distributing(struct port *port, 2130 bool *update_slave_arr) 2131{ 2132 if (port->aggregator && __agg_has_partner(port->aggregator)) { 2133 slave_dbg(port->slave->bond->dev, port->slave->dev, 2134 "Disabling port %d (LAG %d)\n", 2135 port->actor_port_number, 2136 port->aggregator->aggregator_identifier); 2137 __disable_port(port); 2138 /* Slave array needs an update */ 2139 *update_slave_arr = true; 2140 } 2141} 2142 2143/** 2144 * ad_marker_info_received - handle receive of a Marker information frame 2145 * @marker_info: Marker info received 2146 * @port: the port we're looking at 2147 */ 2148static void ad_marker_info_received(struct bond_marker *marker_info, 2149 struct port *port) 2150{ 2151 struct bond_marker marker; 2152 2153 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx); 2154 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx); 2155 2156 /* copy the received marker data to the response marker */ 2157 memcpy(&marker, marker_info, sizeof(struct bond_marker)); 2158 /* change the marker subtype to marker response */ 2159 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE; 2160 2161 /* send the marker response */ 2162 if (ad_marker_send(port, &marker) >= 0) 2163 slave_dbg(port->slave->bond->dev, port->slave->dev, 2164 "Sent Marker Response on port %d\n", 2165 port->actor_port_number); 2166} 2167 2168/** 2169 * ad_marker_response_received - handle receive of a marker response frame 2170 * @marker: marker PDU received 2171 * @port: the port we're looking at 2172 * 2173 * This function does nothing since we decided not to implement send and handle 2174 * response for marker PDU's, in this stage, but only to respond to marker 2175 * information. 2176 */ 2177static void ad_marker_response_received(struct bond_marker *marker, 2178 struct port *port) 2179{ 2180 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx); 2181 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx); 2182 2183 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */ 2184} 2185 2186/* ========= AD exported functions to the main bonding code ========= */ 2187 2188/* Check aggregators status in team every T seconds */ 2189#define AD_AGGREGATOR_SELECTION_TIMER 8 2190 2191/** 2192 * bond_3ad_initiate_agg_selection - initate aggregator selection 2193 * @bond: bonding struct 2194 * @timeout: timeout value to set 2195 * 2196 * Set the aggregation selection timer, to initiate an agg selection in 2197 * the very near future. Called during first initialization, and during 2198 * any down to up transitions of the bond. 2199 */ 2200void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout) 2201{ 2202 atomic_set(&BOND_AD_INFO(bond).agg_select_timer, timeout); 2203} 2204 2205/** 2206 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures 2207 * @bond: bonding struct to work on 2208 * 2209 * Can be called only after the mac address of the bond is set. 2210 */ 2211void bond_3ad_initialize(struct bonding *bond) 2212{ 2213 BOND_AD_INFO(bond).aggregator_identifier = 0; 2214 BOND_AD_INFO(bond).system.sys_priority = 2215 bond->params.ad_actor_sys_prio; 2216 if (is_zero_ether_addr(bond->params.ad_actor_system)) 2217 BOND_AD_INFO(bond).system.sys_mac_addr = 2218 *((struct mac_addr *)bond->dev->dev_addr); 2219 else 2220 BOND_AD_INFO(bond).system.sys_mac_addr = 2221 *((struct mac_addr *)bond->params.ad_actor_system); 2222 2223 bond_3ad_initiate_agg_selection(bond, 2224 AD_AGGREGATOR_SELECTION_TIMER * 2225 ad_ticks_per_sec); 2226} 2227 2228/** 2229 * bond_3ad_bind_slave - initialize a slave's port 2230 * @slave: slave struct to work on 2231 * 2232 * Returns: 0 on success 2233 * < 0 on error 2234 */ 2235void bond_3ad_bind_slave(struct slave *slave) 2236{ 2237 struct bonding *bond = bond_get_bond_by_slave(slave); 2238 struct port *port; 2239 struct aggregator *aggregator; 2240 2241 /* check that the slave has not been initialized yet. */ 2242 if (SLAVE_AD_INFO(slave)->port.slave != slave) { 2243 2244 /* port initialization */ 2245 port = &(SLAVE_AD_INFO(slave)->port); 2246 2247 ad_initialize_port(port, &bond->params); 2248 2249 /* Port priority is initialized. Update it to slave's ad info */ 2250 SLAVE_AD_INFO(slave)->port_priority = port->actor_port_priority; 2251 2252 port->slave = slave; 2253 port->actor_port_number = SLAVE_AD_INFO(slave)->id; 2254 /* key is determined according to the link speed, duplex and 2255 * user key 2256 */ 2257 port->actor_admin_port_key = bond->params.ad_user_port_key << 6; 2258 ad_update_actor_keys(port, false); 2259 /* actor system is the bond's system */ 2260 __ad_actor_update_port(port); 2261 /* tx timer(to verify that no more than MAX_TX_IN_SECOND 2262 * lacpdu's are sent in one second) 2263 */ 2264 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND; 2265 2266 __disable_port(port); 2267 2268 /* aggregator initialization */ 2269 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 2270 2271 ad_initialize_agg(aggregator); 2272 2273 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr); 2274 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier; 2275 aggregator->slave = slave; 2276 aggregator->is_active = 0; 2277 aggregator->num_of_ports = 0; 2278 } 2279} 2280 2281/** 2282 * bond_3ad_unbind_slave - deinitialize a slave's port 2283 * @slave: slave struct to work on 2284 * 2285 * Search for the aggregator that is related to this port, remove the 2286 * aggregator and assign another aggregator for other port related to it 2287 * (if any), and remove the port. 2288 */ 2289void bond_3ad_unbind_slave(struct slave *slave) 2290{ 2291 struct port *port, *prev_port, *temp_port; 2292 struct aggregator *aggregator, *new_aggregator, *temp_aggregator; 2293 int select_new_active_agg = 0; 2294 struct bonding *bond = slave->bond; 2295 struct slave *slave_iter; 2296 struct list_head *iter; 2297 bool dummy_slave_update; /* Ignore this value as caller updates array */ 2298 2299 /* Sync against bond_3ad_state_machine_handler() */ 2300 spin_lock_bh(&bond->mode_lock); 2301 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 2302 port = &(SLAVE_AD_INFO(slave)->port); 2303 2304 /* if slave is null, the whole port is not initialized */ 2305 if (!port->slave) { 2306 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n"); 2307 goto out; 2308 } 2309 2310 slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n", 2311 aggregator->aggregator_identifier); 2312 2313 /* Tell the partner that this port is not suitable for aggregation */ 2314 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; 2315 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; 2316 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 2317 port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION; 2318 __update_lacpdu_from_port(port); 2319 ad_lacpdu_send(port); 2320 2321 /* check if this aggregator is occupied */ 2322 if (aggregator->lag_ports) { 2323 /* check if there are other ports related to this aggregator 2324 * except the port related to this slave(thats ensure us that 2325 * there is a reason to search for new aggregator, and that we 2326 * will find one 2327 */ 2328 if ((aggregator->lag_ports != port) || 2329 (aggregator->lag_ports->next_port_in_aggregator)) { 2330 /* find new aggregator for the related port(s) */ 2331 bond_for_each_slave(bond, slave_iter, iter) { 2332 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); 2333 /* if the new aggregator is empty, or it is 2334 * connected to our port only 2335 */ 2336 if (!new_aggregator->lag_ports || 2337 ((new_aggregator->lag_ports == port) && 2338 !new_aggregator->lag_ports->next_port_in_aggregator)) 2339 break; 2340 } 2341 if (!slave_iter) 2342 new_aggregator = NULL; 2343 2344 /* if new aggregator found, copy the aggregator's 2345 * parameters and connect the related lag_ports to the 2346 * new aggregator 2347 */ 2348 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) { 2349 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n", 2350 aggregator->aggregator_identifier, 2351 new_aggregator->aggregator_identifier); 2352 2353 if ((new_aggregator->lag_ports == port) && 2354 new_aggregator->is_active) { 2355 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); 2356 select_new_active_agg = 1; 2357 } 2358 2359 new_aggregator->is_individual = aggregator->is_individual; 2360 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key; 2361 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key; 2362 new_aggregator->partner_system = aggregator->partner_system; 2363 new_aggregator->partner_system_priority = aggregator->partner_system_priority; 2364 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key; 2365 new_aggregator->receive_state = aggregator->receive_state; 2366 new_aggregator->transmit_state = aggregator->transmit_state; 2367 new_aggregator->lag_ports = aggregator->lag_ports; 2368 new_aggregator->is_active = aggregator->is_active; 2369 new_aggregator->num_of_ports = aggregator->num_of_ports; 2370 2371 /* update the information that is written on 2372 * the ports about the aggregator 2373 */ 2374 for (temp_port = aggregator->lag_ports; temp_port; 2375 temp_port = temp_port->next_port_in_aggregator) { 2376 temp_port->aggregator = new_aggregator; 2377 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier; 2378 } 2379 2380 ad_clear_agg(aggregator); 2381 2382 if (select_new_active_agg) 2383 ad_agg_selection_logic(__get_first_agg(port), 2384 &dummy_slave_update); 2385 } else { 2386 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n"); 2387 } 2388 } else { 2389 /* in case that the only port related to this 2390 * aggregator is the one we want to remove 2391 */ 2392 select_new_active_agg = aggregator->is_active; 2393 ad_clear_agg(aggregator); 2394 if (select_new_active_agg) { 2395 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); 2396 /* select new active aggregator */ 2397 temp_aggregator = __get_first_agg(port); 2398 if (temp_aggregator) 2399 ad_agg_selection_logic(temp_aggregator, 2400 &dummy_slave_update); 2401 } 2402 } 2403 } 2404 2405 slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number); 2406 2407 /* find the aggregator that this port is connected to */ 2408 bond_for_each_slave(bond, slave_iter, iter) { 2409 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); 2410 prev_port = NULL; 2411 /* search the port in the aggregator's related ports */ 2412 for (temp_port = temp_aggregator->lag_ports; temp_port; 2413 prev_port = temp_port, 2414 temp_port = temp_port->next_port_in_aggregator) { 2415 if (temp_port == port) { 2416 /* the aggregator found - detach the port from 2417 * this aggregator 2418 */ 2419 if (prev_port) 2420 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator; 2421 else 2422 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator; 2423 temp_aggregator->num_of_ports--; 2424 if (__agg_active_ports(temp_aggregator) == 0) { 2425 select_new_active_agg = temp_aggregator->is_active; 2426 if (temp_aggregator->num_of_ports == 0) 2427 ad_clear_agg(temp_aggregator); 2428 if (select_new_active_agg) { 2429 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); 2430 /* select new active aggregator */ 2431 ad_agg_selection_logic(__get_first_agg(port), 2432 &dummy_slave_update); 2433 } 2434 } 2435 break; 2436 } 2437 } 2438 } 2439 port->slave = NULL; 2440 2441out: 2442 spin_unlock_bh(&bond->mode_lock); 2443} 2444 2445/** 2446 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports 2447 * @bond: bonding struct to work on 2448 * 2449 * If an ad_actor setting gets changed we need to update the individual port 2450 * settings so the bond device will use the new values when it gets upped. 2451 */ 2452void bond_3ad_update_ad_actor_settings(struct bonding *bond) 2453{ 2454 struct list_head *iter; 2455 struct slave *slave; 2456 2457 ASSERT_RTNL(); 2458 2459 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio; 2460 if (is_zero_ether_addr(bond->params.ad_actor_system)) 2461 BOND_AD_INFO(bond).system.sys_mac_addr = 2462 *((struct mac_addr *)bond->dev->dev_addr); 2463 else 2464 BOND_AD_INFO(bond).system.sys_mac_addr = 2465 *((struct mac_addr *)bond->params.ad_actor_system); 2466 2467 spin_lock_bh(&bond->mode_lock); 2468 bond_for_each_slave(bond, slave, iter) { 2469 struct port *port = &(SLAVE_AD_INFO(slave))->port; 2470 2471 __ad_actor_update_port(port); 2472 port->ntt = true; 2473 } 2474 spin_unlock_bh(&bond->mode_lock); 2475} 2476 2477/** 2478 * bond_agg_timer_advance - advance agg_select_timer 2479 * @bond: bonding structure 2480 * 2481 * Return true when agg_select_timer reaches 0. 2482 */ 2483static bool bond_agg_timer_advance(struct bonding *bond) 2484{ 2485 int val, nval; 2486 2487 while (1) { 2488 val = atomic_read(&BOND_AD_INFO(bond).agg_select_timer); 2489 if (!val) 2490 return false; 2491 nval = val - 1; 2492 if (atomic_cmpxchg(&BOND_AD_INFO(bond).agg_select_timer, 2493 val, nval) == val) 2494 break; 2495 } 2496 return nval == 0; 2497} 2498 2499/** 2500 * bond_3ad_state_machine_handler - handle state machines timeout 2501 * @work: work context to fetch bonding struct to work on from 2502 * 2503 * The state machine handling concept in this module is to check every tick 2504 * which state machine should operate any function. The execution order is 2505 * round robin, so when we have an interaction between state machines, the 2506 * reply of one to each other might be delayed until next tick. 2507 * 2508 * This function also complete the initialization when the agg_select_timer 2509 * times out, and it selects an aggregator for the ports that are yet not 2510 * related to any aggregator, and selects the active aggregator for a bond. 2511 */ 2512void bond_3ad_state_machine_handler(struct work_struct *work) 2513{ 2514 struct bonding *bond = container_of(work, struct bonding, 2515 ad_work.work); 2516 struct aggregator *aggregator; 2517 struct list_head *iter; 2518 struct slave *slave; 2519 struct port *port; 2520 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2521 bool update_slave_arr = false; 2522 2523 /* Lock to protect data accessed by all (e.g., port->sm_vars) and 2524 * against running with bond_3ad_unbind_slave. ad_rx_machine may run 2525 * concurrently due to incoming LACPDU as well. 2526 */ 2527 spin_lock_bh(&bond->mode_lock); 2528 rcu_read_lock(); 2529 2530 /* check if there are any slaves */ 2531 if (!bond_has_slaves(bond)) 2532 goto re_arm; 2533 2534 if (bond_agg_timer_advance(bond)) { 2535 slave = bond_first_slave_rcu(bond); 2536 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL; 2537 2538 /* select the active aggregator for the bond */ 2539 if (port) { 2540 if (!port->slave) { 2541 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n", 2542 bond->dev->name); 2543 goto re_arm; 2544 } 2545 2546 aggregator = __get_first_agg(port); 2547 ad_agg_selection_logic(aggregator, &update_slave_arr); 2548 } 2549 bond_3ad_set_carrier(bond); 2550 } 2551 2552 /* for each port run the state machines */ 2553 bond_for_each_slave_rcu(bond, slave, iter) { 2554 port = &(SLAVE_AD_INFO(slave)->port); 2555 if (!port->slave) { 2556 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n", 2557 bond->dev->name); 2558 goto re_arm; 2559 } 2560 2561 ad_rx_machine(NULL, port); 2562 ad_periodic_machine(port); 2563 ad_port_selection_logic(port, &update_slave_arr); 2564 ad_mux_machine(port, &update_slave_arr); 2565 ad_tx_machine(port); 2566 ad_churn_machine(port); 2567 2568 /* turn off the BEGIN bit, since we already handled it */ 2569 if (port->sm_vars & AD_PORT_BEGIN) 2570 port->sm_vars &= ~AD_PORT_BEGIN; 2571 } 2572 2573re_arm: 2574 bond_for_each_slave_rcu(bond, slave, iter) { 2575 if (slave->should_notify) { 2576 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2577 break; 2578 } 2579 } 2580 rcu_read_unlock(); 2581 spin_unlock_bh(&bond->mode_lock); 2582 2583 if (update_slave_arr) 2584 bond_slave_arr_work_rearm(bond, 0); 2585 2586 if (should_notify_rtnl && rtnl_trylock()) { 2587 bond_slave_state_notify(bond); 2588 rtnl_unlock(); 2589 } 2590 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); 2591} 2592 2593/** 2594 * bond_3ad_rx_indication - handle a received frame 2595 * @lacpdu: received lacpdu 2596 * @slave: slave struct to work on 2597 * 2598 * It is assumed that frames that were sent on this NIC don't returned as new 2599 * received frames (loopback). Since only the payload is given to this 2600 * function, it check for loopback. 2601 */ 2602static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave) 2603{ 2604 struct bonding *bond = slave->bond; 2605 int ret = RX_HANDLER_ANOTHER; 2606 struct bond_marker *marker; 2607 struct port *port; 2608 atomic64_t *stat; 2609 2610 port = &(SLAVE_AD_INFO(slave)->port); 2611 if (!port->slave) { 2612 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n", 2613 slave->dev->name, slave->bond->dev->name); 2614 return ret; 2615 } 2616 2617 switch (lacpdu->subtype) { 2618 case AD_TYPE_LACPDU: 2619 ret = RX_HANDLER_CONSUMED; 2620 slave_dbg(slave->bond->dev, slave->dev, 2621 "Received LACPDU on port %d\n", 2622 port->actor_port_number); 2623 /* Protect against concurrent state machines */ 2624 spin_lock(&slave->bond->mode_lock); 2625 ad_rx_machine(lacpdu, port); 2626 spin_unlock(&slave->bond->mode_lock); 2627 break; 2628 case AD_TYPE_MARKER: 2629 ret = RX_HANDLER_CONSUMED; 2630 /* No need to convert fields to Little Endian since we 2631 * don't use the marker's fields. 2632 */ 2633 marker = (struct bond_marker *)lacpdu; 2634 switch (marker->tlv_type) { 2635 case AD_MARKER_INFORMATION_SUBTYPE: 2636 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n", 2637 port->actor_port_number); 2638 ad_marker_info_received(marker, port); 2639 break; 2640 case AD_MARKER_RESPONSE_SUBTYPE: 2641 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n", 2642 port->actor_port_number); 2643 ad_marker_response_received(marker, port); 2644 break; 2645 default: 2646 slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n", 2647 port->actor_port_number); 2648 stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx; 2649 atomic64_inc(stat); 2650 stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx; 2651 atomic64_inc(stat); 2652 } 2653 break; 2654 default: 2655 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx); 2656 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx); 2657 } 2658 2659 return ret; 2660} 2661 2662/** 2663 * ad_update_actor_keys - Update the oper / admin keys for a port based on 2664 * its current speed and duplex settings. 2665 * 2666 * @port: the port we'are looking at 2667 * @reset: Boolean to just reset the speed and the duplex part of the key 2668 * 2669 * The logic to change the oper / admin keys is: 2670 * (a) A full duplex port can participate in LACP with partner. 2671 * (b) When the speed is changed, LACP need to be reinitiated. 2672 */ 2673static void ad_update_actor_keys(struct port *port, bool reset) 2674{ 2675 u8 duplex = 0; 2676 u16 ospeed = 0, speed = 0; 2677 u16 old_oper_key = port->actor_oper_port_key; 2678 2679 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS); 2680 if (!reset) { 2681 speed = __get_link_speed(port); 2682 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1; 2683 duplex = __get_duplex(port); 2684 port->actor_admin_port_key |= (speed << 1) | duplex; 2685 } 2686 port->actor_oper_port_key = port->actor_admin_port_key; 2687 2688 if (old_oper_key != port->actor_oper_port_key) { 2689 /* Only 'duplex' port participates in LACP */ 2690 if (duplex) 2691 port->sm_vars |= AD_PORT_LACP_ENABLED; 2692 else 2693 port->sm_vars &= ~AD_PORT_LACP_ENABLED; 2694 2695 if (!reset) { 2696 if (!speed) { 2697 slave_err(port->slave->bond->dev, 2698 port->slave->dev, 2699 "speed changed to 0 on port %d\n", 2700 port->actor_port_number); 2701 } else if (duplex && ospeed != speed) { 2702 /* Speed change restarts LACP state-machine */ 2703 port->sm_vars |= AD_PORT_BEGIN; 2704 } 2705 } 2706 } 2707} 2708 2709/** 2710 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex 2711 * change indication 2712 * 2713 * @slave: slave struct to work on 2714 * 2715 * Handle reselection of aggregator (if needed) for this port. 2716 */ 2717void bond_3ad_adapter_speed_duplex_changed(struct slave *slave) 2718{ 2719 struct port *port; 2720 2721 port = &(SLAVE_AD_INFO(slave)->port); 2722 2723 /* if slave is null, the whole port is not initialized */ 2724 if (!port->slave) { 2725 slave_warn(slave->bond->dev, slave->dev, 2726 "speed/duplex changed for uninitialized port\n"); 2727 return; 2728 } 2729 2730 spin_lock_bh(&slave->bond->mode_lock); 2731 ad_update_actor_keys(port, false); 2732 spin_unlock_bh(&slave->bond->mode_lock); 2733 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n", 2734 port->actor_port_number); 2735} 2736 2737/** 2738 * bond_3ad_handle_link_change - handle a slave's link status change indication 2739 * @slave: slave struct to work on 2740 * @link: whether the link is now up or down 2741 * 2742 * Handle reselection of aggregator (if needed) for this port. 2743 */ 2744void bond_3ad_handle_link_change(struct slave *slave, char link) 2745{ 2746 struct aggregator *agg; 2747 struct port *port; 2748 bool dummy; 2749 2750 port = &(SLAVE_AD_INFO(slave)->port); 2751 2752 /* if slave is null, the whole port is not initialized */ 2753 if (!port->slave) { 2754 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n"); 2755 return; 2756 } 2757 2758 spin_lock_bh(&slave->bond->mode_lock); 2759 /* on link down we are zeroing duplex and speed since 2760 * some of the adaptors(ce1000.lan) report full duplex/speed 2761 * instead of N/A(duplex) / 0(speed). 2762 * 2763 * on link up we are forcing recheck on the duplex and speed since 2764 * some of he adaptors(ce1000.lan) report. 2765 */ 2766 if (link == BOND_LINK_UP) { 2767 port->is_enabled = true; 2768 ad_update_actor_keys(port, false); 2769 } else { 2770 /* link has failed */ 2771 port->is_enabled = false; 2772 ad_update_actor_keys(port, true); 2773 } 2774 agg = __get_first_agg(port); 2775 ad_agg_selection_logic(agg, &dummy); 2776 2777 spin_unlock_bh(&slave->bond->mode_lock); 2778 2779 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n", 2780 port->actor_port_number, 2781 link == BOND_LINK_UP ? "UP" : "DOWN"); 2782 2783 /* RTNL is held and mode_lock is released so it's safe 2784 * to update slave_array here. 2785 */ 2786 bond_update_slave_arr(slave->bond, NULL); 2787} 2788 2789/** 2790 * bond_3ad_set_carrier - set link state for bonding master 2791 * @bond: bonding structure 2792 * 2793 * if we have an active aggregator, we're up, if not, we're down. 2794 * Presumes that we cannot have an active aggregator if there are 2795 * no slaves with link up. 2796 * 2797 * This behavior complies with IEEE 802.3 section 43.3.9. 2798 * 2799 * Called by bond_set_carrier(). Return zero if carrier state does not 2800 * change, nonzero if it does. 2801 */ 2802int bond_3ad_set_carrier(struct bonding *bond) 2803{ 2804 struct aggregator *active; 2805 struct slave *first_slave; 2806 int ret = 1; 2807 2808 rcu_read_lock(); 2809 first_slave = bond_first_slave_rcu(bond); 2810 if (!first_slave) { 2811 ret = 0; 2812 goto out; 2813 } 2814 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator)); 2815 if (active) { 2816 /* are enough slaves available to consider link up? */ 2817 if (__agg_active_ports(active) < bond->params.min_links) { 2818 if (netif_carrier_ok(bond->dev)) { 2819 netif_carrier_off(bond->dev); 2820 goto out; 2821 } 2822 } else if (!netif_carrier_ok(bond->dev)) { 2823 netif_carrier_on(bond->dev); 2824 goto out; 2825 } 2826 } else if (netif_carrier_ok(bond->dev)) { 2827 netif_carrier_off(bond->dev); 2828 } 2829out: 2830 rcu_read_unlock(); 2831 return ret; 2832} 2833 2834/** 2835 * __bond_3ad_get_active_agg_info - get information of the active aggregator 2836 * @bond: bonding struct to work on 2837 * @ad_info: ad_info struct to fill with the bond's info 2838 * 2839 * Returns: 0 on success 2840 * < 0 on error 2841 */ 2842int __bond_3ad_get_active_agg_info(struct bonding *bond, 2843 struct ad_info *ad_info) 2844{ 2845 struct aggregator *aggregator = NULL; 2846 struct list_head *iter; 2847 struct slave *slave; 2848 struct port *port; 2849 2850 bond_for_each_slave_rcu(bond, slave, iter) { 2851 port = &(SLAVE_AD_INFO(slave)->port); 2852 if (port->aggregator && port->aggregator->is_active) { 2853 aggregator = port->aggregator; 2854 break; 2855 } 2856 } 2857 2858 if (!aggregator) 2859 return -1; 2860 2861 ad_info->aggregator_id = aggregator->aggregator_identifier; 2862 ad_info->ports = __agg_active_ports(aggregator); 2863 ad_info->actor_key = aggregator->actor_oper_aggregator_key; 2864 ad_info->partner_key = aggregator->partner_oper_aggregator_key; 2865 ether_addr_copy(ad_info->partner_system, 2866 aggregator->partner_system.mac_addr_value); 2867 return 0; 2868} 2869 2870int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info) 2871{ 2872 int ret; 2873 2874 rcu_read_lock(); 2875 ret = __bond_3ad_get_active_agg_info(bond, ad_info); 2876 rcu_read_unlock(); 2877 2878 return ret; 2879} 2880 2881int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond, 2882 struct slave *slave) 2883{ 2884 struct lacpdu *lacpdu, _lacpdu; 2885 2886 if (skb->protocol != PKT_TYPE_LACPDU) 2887 return RX_HANDLER_ANOTHER; 2888 2889 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr)) 2890 return RX_HANDLER_ANOTHER; 2891 2892 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu); 2893 if (!lacpdu) { 2894 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx); 2895 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx); 2896 return RX_HANDLER_ANOTHER; 2897 } 2898 2899 return bond_3ad_rx_indication(lacpdu, slave); 2900} 2901 2902/** 2903 * bond_3ad_update_lacp_rate - change the lacp rate 2904 * @bond: bonding struct 2905 * 2906 * When modify lacp_rate parameter via sysfs, 2907 * update actor_oper_port_state of each port. 2908 * 2909 * Hold bond->mode_lock, 2910 * so we can modify port->actor_oper_port_state, 2911 * no matter bond is up or down. 2912 */ 2913void bond_3ad_update_lacp_rate(struct bonding *bond) 2914{ 2915 struct port *port = NULL; 2916 struct list_head *iter; 2917 struct slave *slave; 2918 int lacp_fast; 2919 2920 lacp_fast = bond->params.lacp_fast; 2921 spin_lock_bh(&bond->mode_lock); 2922 bond_for_each_slave(bond, slave, iter) { 2923 port = &(SLAVE_AD_INFO(slave)->port); 2924 if (lacp_fast) 2925 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT; 2926 else 2927 port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT; 2928 } 2929 spin_unlock_bh(&bond->mode_lock); 2930} 2931 2932/** 2933 * bond_3ad_update_lacp_active - change the lacp active 2934 * @bond: bonding struct 2935 * 2936 * Update actor_oper_port_state when lacp_active is modified. 2937 */ 2938void bond_3ad_update_lacp_active(struct bonding *bond) 2939{ 2940 struct port *port = NULL; 2941 struct list_head *iter; 2942 struct slave *slave; 2943 int lacp_active; 2944 2945 lacp_active = bond->params.lacp_active; 2946 spin_lock_bh(&bond->mode_lock); 2947 bond_for_each_slave(bond, slave, iter) { 2948 port = &(SLAVE_AD_INFO(slave)->port); 2949 if (lacp_active) 2950 port->actor_oper_port_state |= LACP_STATE_LACP_ACTIVITY; 2951 else 2952 port->actor_oper_port_state &= ~LACP_STATE_LACP_ACTIVITY; 2953 } 2954 spin_unlock_bh(&bond->mode_lock); 2955} 2956 2957size_t bond_3ad_stats_size(void) 2958{ 2959 return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */ 2960 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */ 2961 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */ 2962 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */ 2963 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */ 2964 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */ 2965 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */ 2966 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */ 2967 nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */ 2968} 2969 2970int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats) 2971{ 2972 u64 val; 2973 2974 val = atomic64_read(&stats->lacpdu_rx); 2975 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val, 2976 BOND_3AD_STAT_PAD)) 2977 return -EMSGSIZE; 2978 val = atomic64_read(&stats->lacpdu_tx); 2979 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val, 2980 BOND_3AD_STAT_PAD)) 2981 return -EMSGSIZE; 2982 val = atomic64_read(&stats->lacpdu_unknown_rx); 2983 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val, 2984 BOND_3AD_STAT_PAD)) 2985 return -EMSGSIZE; 2986 val = atomic64_read(&stats->lacpdu_illegal_rx); 2987 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val, 2988 BOND_3AD_STAT_PAD)) 2989 return -EMSGSIZE; 2990 2991 val = atomic64_read(&stats->marker_rx); 2992 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val, 2993 BOND_3AD_STAT_PAD)) 2994 return -EMSGSIZE; 2995 val = atomic64_read(&stats->marker_tx); 2996 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val, 2997 BOND_3AD_STAT_PAD)) 2998 return -EMSGSIZE; 2999 val = atomic64_read(&stats->marker_resp_rx); 3000 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val, 3001 BOND_3AD_STAT_PAD)) 3002 return -EMSGSIZE; 3003 val = atomic64_read(&stats->marker_resp_tx); 3004 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val, 3005 BOND_3AD_STAT_PAD)) 3006 return -EMSGSIZE; 3007 val = atomic64_read(&stats->marker_unknown_rx); 3008 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val, 3009 BOND_3AD_STAT_PAD)) 3010 return -EMSGSIZE; 3011 3012 return 0; 3013}
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