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