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