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_80000MBPS, 76 AD_LINK_SPEED_100000MBPS, 77 AD_LINK_SPEED_200000MBPS, 78 AD_LINK_SPEED_400000MBPS, 79 AD_LINK_SPEED_800000MBPS, 80 AD_LINK_SPEED_1600000MBPS, 81 }; 82 83 /* compare MAC addresses */ 84 #define MAC_ADDRESS_EQUAL(A, B) \ 85 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B) 86 87 static const u16 ad_ticks_per_sec = 1000 / AD_TIMER_INTERVAL; 88 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000; 89 90 const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned = { 91 0x01, 0x80, 0xC2, 0x00, 0x00, 0x02 92 }; 93 94 /* ================= main 802.3ad protocol functions ================== */ 95 static int ad_lacpdu_send(struct port *port); 96 static int ad_marker_send(struct port *port, struct bond_marker *marker); 97 static void ad_mux_machine(struct port *port, bool *update_slave_arr); 98 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port); 99 static void ad_tx_machine(struct port *port); 100 static void ad_periodic_machine(struct port *port); 101 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr); 102 static void ad_agg_selection_logic(struct aggregator *aggregator, 103 bool *update_slave_arr); 104 static void ad_clear_agg(struct aggregator *aggregator); 105 static void ad_initialize_agg(struct aggregator *aggregator); 106 static void ad_initialize_port(struct port *port, const struct bond_params *bond_params); 107 static void ad_enable_collecting(struct port *port); 108 static void ad_disable_distributing(struct port *port, 109 bool *update_slave_arr); 110 static void ad_enable_collecting_distributing(struct port *port, 111 bool *update_slave_arr); 112 static void ad_disable_collecting_distributing(struct port *port, 113 bool *update_slave_arr); 114 static void ad_marker_info_received(struct bond_marker *marker_info, 115 struct port *port); 116 static void ad_marker_response_received(struct bond_marker *marker, 117 struct port *port); 118 static void ad_update_actor_keys(struct port *port, bool reset); 119 120 121 /* ================= api to bonding and kernel code ================== */ 122 123 /** 124 * __get_bond_by_port - get the port's bonding struct 125 * @port: the port we're looking at 126 * 127 * Return @port's bonding struct, or %NULL if it can't be found. 128 */ 129 static inline struct bonding *__get_bond_by_port(struct port *port) 130 { 131 if (port->slave == NULL) 132 return NULL; 133 134 return bond_get_bond_by_slave(port->slave); 135 } 136 137 /** 138 * __get_first_agg - get the first aggregator in the bond 139 * @port: the port we're looking at 140 * 141 * Return the aggregator of the first slave in @bond, or %NULL if it can't be 142 * found. 143 * The caller must hold RCU or RTNL lock. 144 */ 145 static inline struct aggregator *__get_first_agg(struct port *port) 146 { 147 struct bonding *bond = __get_bond_by_port(port); 148 struct slave *first_slave; 149 struct aggregator *agg; 150 151 /* If there's no bond for this port, or bond has no slaves */ 152 if (bond == NULL) 153 return NULL; 154 155 rcu_read_lock(); 156 first_slave = bond_first_slave_rcu(bond); 157 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL; 158 rcu_read_unlock(); 159 160 return agg; 161 } 162 163 /** 164 * __agg_has_partner - see if we have a partner 165 * @agg: the agregator we're looking at 166 * 167 * Return nonzero if aggregator has a partner (denoted by a non-zero ether 168 * address for the partner). Return 0 if not. 169 */ 170 static inline int __agg_has_partner(struct aggregator *agg) 171 { 172 return !is_zero_ether_addr(agg->partner_system.mac_addr_value); 173 } 174 175 /** 176 * __disable_distributing_port - disable the port's slave for distributing. 177 * Port will still be able to collect. 178 * @port: the port we're looking at 179 * 180 * This will disable only distributing on the port's slave. 181 */ 182 static void __disable_distributing_port(struct port *port) 183 { 184 bond_set_slave_tx_disabled_flags(port->slave, BOND_SLAVE_NOTIFY_LATER); 185 } 186 187 /** 188 * __enable_collecting_port - enable the port's slave for collecting, 189 * if it's up 190 * @port: the port we're looking at 191 * 192 * This will enable only collecting on the port's slave. 193 */ 194 static void __enable_collecting_port(struct port *port) 195 { 196 struct slave *slave = port->slave; 197 198 if (slave->link == BOND_LINK_UP && bond_slave_is_up(slave)) 199 bond_set_slave_rx_enabled_flags(slave, BOND_SLAVE_NOTIFY_LATER); 200 } 201 202 /** 203 * __disable_port - disable the port's slave 204 * @port: the port we're looking at 205 * 206 * This will disable both collecting and distributing on the port's slave. 207 */ 208 static inline void __disable_port(struct port *port) 209 { 210 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER); 211 } 212 213 /** 214 * __enable_port - enable the port's slave, if it's up 215 * @port: the port we're looking at 216 * 217 * This will enable both collecting and distributing on the port's slave. 218 */ 219 static inline void __enable_port(struct port *port) 220 { 221 struct slave *slave = port->slave; 222 223 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave)) 224 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER); 225 } 226 227 /** 228 * __port_move_to_attached_state - check if port should transition back to attached 229 * state. 230 * @port: the port we're looking at 231 */ 232 static bool __port_move_to_attached_state(struct port *port) 233 { 234 if (!(port->sm_vars & AD_PORT_SELECTED) || 235 (port->sm_vars & AD_PORT_STANDBY) || 236 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) || 237 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) 238 port->sm_mux_state = AD_MUX_ATTACHED; 239 240 return port->sm_mux_state == AD_MUX_ATTACHED; 241 } 242 243 /** 244 * __port_is_collecting_distributing - check if the port's slave is in the 245 * combined collecting/distributing state 246 * @port: the port we're looking at 247 */ 248 static int __port_is_collecting_distributing(struct port *port) 249 { 250 return bond_is_active_slave(port->slave); 251 } 252 253 /** 254 * __get_agg_selection_mode - get the aggregator selection mode 255 * @port: the port we're looking at 256 * 257 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT. 258 */ 259 static inline u32 __get_agg_selection_mode(struct port *port) 260 { 261 struct bonding *bond = __get_bond_by_port(port); 262 263 if (bond == NULL) 264 return BOND_AD_STABLE; 265 266 return bond->params.ad_select; 267 } 268 269 /** 270 * __check_agg_selection_timer - check if the selection timer has expired 271 * @port: the port we're looking at 272 */ 273 static inline int __check_agg_selection_timer(struct port *port) 274 { 275 struct bonding *bond = __get_bond_by_port(port); 276 277 if (bond == NULL) 278 return 0; 279 280 return atomic_read(&BOND_AD_INFO(bond).agg_select_timer) ? 1 : 0; 281 } 282 283 /** 284 * __get_link_speed - get a port's speed 285 * @port: the port we're looking at 286 * 287 * Return @port's speed in 802.3ad enum format. i.e. one of: 288 * 0, 289 * %AD_LINK_SPEED_10MBPS, 290 * %AD_LINK_SPEED_100MBPS, 291 * %AD_LINK_SPEED_1000MBPS, 292 * %AD_LINK_SPEED_2500MBPS, 293 * %AD_LINK_SPEED_5000MBPS, 294 * %AD_LINK_SPEED_10000MBPS 295 * %AD_LINK_SPEED_14000MBPS, 296 * %AD_LINK_SPEED_20000MBPS 297 * %AD_LINK_SPEED_25000MBPS 298 * %AD_LINK_SPEED_40000MBPS 299 * %AD_LINK_SPEED_50000MBPS 300 * %AD_LINK_SPEED_56000MBPS 301 * %AD_LINK_SPEED_80000MBPS 302 * %AD_LINK_SPEED_100000MBPS 303 * %AD_LINK_SPEED_200000MBPS 304 * %AD_LINK_SPEED_400000MBPS 305 * %AD_LINK_SPEED_800000MBPS 306 * %AD_LINK_SPEED_1600000MBPS 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_80000: 371 speed = AD_LINK_SPEED_80000MBPS; 372 break; 373 374 case SPEED_100000: 375 speed = AD_LINK_SPEED_100000MBPS; 376 break; 377 378 case SPEED_200000: 379 speed = AD_LINK_SPEED_200000MBPS; 380 break; 381 382 case SPEED_400000: 383 speed = AD_LINK_SPEED_400000MBPS; 384 break; 385 386 case SPEED_800000: 387 speed = AD_LINK_SPEED_800000MBPS; 388 break; 389 390 case SPEED_1600000: 391 speed = AD_LINK_SPEED_1600000MBPS; 392 break; 393 394 default: 395 /* unknown speed value from ethtool. shouldn't happen */ 396 if (slave->speed != SPEED_UNKNOWN) 397 pr_err_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n", 398 slave->bond->dev->name, 399 slave->dev->name, slave->speed, 400 port->actor_port_number); 401 speed = 0; 402 break; 403 } 404 } 405 406 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n", 407 port->actor_port_number, speed); 408 return speed; 409 } 410 411 /** 412 * __get_duplex - get a port's duplex 413 * @port: the port we're looking at 414 * 415 * Return @port's duplex in 802.3ad bitmask format. i.e.: 416 * 0x01 if in full duplex 417 * 0x00 otherwise 418 */ 419 static u8 __get_duplex(struct port *port) 420 { 421 struct slave *slave = port->slave; 422 u8 retval = 0x0; 423 424 /* handling a special case: when the configuration starts with 425 * link down, it sets the duplex to 0. 426 */ 427 if (slave->link == BOND_LINK_UP) { 428 switch (slave->duplex) { 429 case DUPLEX_FULL: 430 retval = 0x1; 431 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n", 432 port->actor_port_number); 433 break; 434 case DUPLEX_HALF: 435 default: 436 retval = 0x0; 437 slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n", 438 port->actor_port_number); 439 break; 440 } 441 } 442 return retval; 443 } 444 445 static void __ad_actor_update_port(struct port *port) 446 { 447 const struct bonding *bond = bond_get_bond_by_slave(port->slave); 448 449 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr; 450 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority; 451 port->actor_port_priority = SLAVE_AD_INFO(port->slave)->port_priority; 452 } 453 454 /* Conversions */ 455 456 /** 457 * __ad_timer_to_ticks - convert a given timer type to AD module ticks 458 * @timer_type: which timer to operate 459 * @par: timer parameter. see below 460 * 461 * If @timer_type is %current_while_timer, @par indicates long/short timer. 462 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME, 463 * %SLOW_PERIODIC_TIME. 464 */ 465 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par) 466 { 467 u16 retval = 0; /* to silence the compiler */ 468 469 switch (timer_type) { 470 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */ 471 if (par) 472 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); 473 else 474 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); 475 break; 476 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */ 477 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); 478 break; 479 case AD_PERIODIC_TIMER: /* for periodic machine */ 480 retval = (par*ad_ticks_per_sec); /* long timeout */ 481 break; 482 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */ 483 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); 484 break; 485 case AD_WAIT_WHILE_TIMER: /* for selection machine */ 486 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec); 487 break; 488 } 489 490 return retval; 491 } 492 493 494 /* ================= ad_rx_machine helper functions ================== */ 495 496 /** 497 * __choose_matched - update a port's matched variable from a received lacpdu 498 * @lacpdu: the lacpdu we've received 499 * @port: the port we're looking at 500 * 501 * Update the value of the matched variable, using parameter values from a 502 * newly received lacpdu. Parameter values for the partner carried in the 503 * received PDU are compared with the corresponding operational parameter 504 * values for the actor. Matched is set to TRUE if all of these parameters 505 * match and the PDU parameter partner_state.aggregation has the same value as 506 * actor_oper_port_state.aggregation and lacp will actively maintain the link 507 * in the aggregation. Matched is also set to TRUE if the value of 508 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates 509 * an individual link and lacp will actively maintain the link. Otherwise, 510 * matched is set to FALSE. LACP is considered to be actively maintaining the 511 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both 512 * the actor's actor_oper_port_state.lacp_activity and the PDU's 513 * partner_state.lacp_activity variables are TRUE. 514 * 515 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is 516 * used here to implement the language from 802.3ad 43.4.9 that requires 517 * recordPDU to "match" the LACPDU parameters to the stored values. 518 */ 519 static void __choose_matched(struct lacpdu *lacpdu, struct port *port) 520 { 521 /* check if all parameters are alike 522 * or this is individual link(aggregation == FALSE) 523 * then update the state machine Matched variable. 524 */ 525 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) && 526 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) && 527 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) && 528 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) && 529 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) && 530 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) || 531 ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0) 532 ) { 533 port->sm_vars |= AD_PORT_MATCHED; 534 } else { 535 port->sm_vars &= ~AD_PORT_MATCHED; 536 } 537 } 538 539 /** 540 * __record_pdu - record parameters from a received lacpdu 541 * @lacpdu: the lacpdu we've received 542 * @port: the port we're looking at 543 * 544 * Record the parameter values for the Actor carried in a received lacpdu as 545 * the current partner operational parameter values and sets 546 * actor_oper_port_state.defaulted to FALSE. 547 */ 548 static void __record_pdu(struct lacpdu *lacpdu, struct port *port) 549 { 550 if (lacpdu && port) { 551 struct port_params *partner = &port->partner_oper; 552 553 __choose_matched(lacpdu, port); 554 /* record the new parameter values for the partner 555 * operational 556 */ 557 partner->port_number = ntohs(lacpdu->actor_port); 558 partner->port_priority = ntohs(lacpdu->actor_port_priority); 559 partner->system = lacpdu->actor_system; 560 partner->system_priority = ntohs(lacpdu->actor_system_priority); 561 partner->key = ntohs(lacpdu->actor_key); 562 partner->port_state = lacpdu->actor_state; 563 564 /* set actor_oper_port_state.defaulted to FALSE */ 565 port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED; 566 567 /* set the partner sync. to on if the partner is sync, 568 * and the port is matched 569 */ 570 if ((port->sm_vars & AD_PORT_MATCHED) && 571 (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) { 572 partner->port_state |= LACP_STATE_SYNCHRONIZATION; 573 slave_dbg(port->slave->bond->dev, port->slave->dev, 574 "partner sync=1\n"); 575 } else { 576 partner->port_state &= ~LACP_STATE_SYNCHRONIZATION; 577 slave_dbg(port->slave->bond->dev, port->slave->dev, 578 "partner sync=0\n"); 579 } 580 } 581 } 582 583 /** 584 * __record_default - record default parameters 585 * @port: the port we're looking at 586 * 587 * This function records the default parameter values for the partner carried 588 * in the Partner Admin parameters as the current partner operational parameter 589 * values and sets actor_oper_port_state.defaulted to TRUE. 590 */ 591 static void __record_default(struct port *port) 592 { 593 if (port) { 594 /* record the partner admin parameters */ 595 memcpy(&port->partner_oper, &port->partner_admin, 596 sizeof(struct port_params)); 597 598 /* set actor_oper_port_state.defaulted to true */ 599 port->actor_oper_port_state |= LACP_STATE_DEFAULTED; 600 } 601 } 602 603 /** 604 * __update_selected - update a port's Selected variable from a received lacpdu 605 * @lacpdu: the lacpdu we've received 606 * @port: the port we're looking at 607 * 608 * Update the value of the selected variable, using parameter values from a 609 * newly received lacpdu. The parameter values for the Actor carried in the 610 * received PDU are compared with the corresponding operational parameter 611 * values for the ports partner. If one or more of the comparisons shows that 612 * the value(s) received in the PDU differ from the current operational values, 613 * then selected is set to FALSE and actor_oper_port_state.synchronization is 614 * set to out_of_sync. Otherwise, selected remains unchanged. 615 */ 616 static void __update_selected(struct lacpdu *lacpdu, struct port *port) 617 { 618 if (lacpdu && port) { 619 const struct port_params *partner = &port->partner_oper; 620 621 /* check if any parameter is different then 622 * update the state machine selected variable. 623 */ 624 if (ntohs(lacpdu->actor_port) != partner->port_number || 625 ntohs(lacpdu->actor_port_priority) != partner->port_priority || 626 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) || 627 ntohs(lacpdu->actor_system_priority) != partner->system_priority || 628 ntohs(lacpdu->actor_key) != partner->key || 629 (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) { 630 port->sm_vars &= ~AD_PORT_SELECTED; 631 } 632 } 633 } 634 635 /** 636 * __update_default_selected - update a port's Selected variable from Partner 637 * @port: the port we're looking at 638 * 639 * This function updates the value of the selected variable, using the partner 640 * administrative parameter values. The administrative values are compared with 641 * the corresponding operational parameter values for the partner. If one or 642 * more of the comparisons shows that the administrative value(s) differ from 643 * the current operational values, then Selected is set to FALSE and 644 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise, 645 * Selected remains unchanged. 646 */ 647 static void __update_default_selected(struct port *port) 648 { 649 if (port) { 650 const struct port_params *admin = &port->partner_admin; 651 const struct port_params *oper = &port->partner_oper; 652 653 /* check if any parameter is different then 654 * update the state machine selected variable. 655 */ 656 if (admin->port_number != oper->port_number || 657 admin->port_priority != oper->port_priority || 658 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) || 659 admin->system_priority != oper->system_priority || 660 admin->key != oper->key || 661 (admin->port_state & LACP_STATE_AGGREGATION) 662 != (oper->port_state & LACP_STATE_AGGREGATION)) { 663 port->sm_vars &= ~AD_PORT_SELECTED; 664 } 665 } 666 } 667 668 /** 669 * __update_ntt - update a port's ntt variable from a received lacpdu 670 * @lacpdu: the lacpdu we've received 671 * @port: the port we're looking at 672 * 673 * Updates the value of the ntt variable, using parameter values from a newly 674 * received lacpdu. The parameter values for the partner carried in the 675 * received PDU are compared with the corresponding operational parameter 676 * values for the Actor. If one or more of the comparisons shows that the 677 * value(s) received in the PDU differ from the current operational values, 678 * then ntt is set to TRUE. Otherwise, ntt remains unchanged. 679 */ 680 static void __update_ntt(struct lacpdu *lacpdu, struct port *port) 681 { 682 /* validate lacpdu and port */ 683 if (lacpdu && port) { 684 /* check if any parameter is different then 685 * update the port->ntt. 686 */ 687 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) || 688 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) || 689 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) || 690 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) || 691 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) || 692 ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) || 693 ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) || 694 ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) || 695 ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION)) 696 ) { 697 port->ntt = true; 698 } 699 } 700 } 701 702 /** 703 * __agg_ports_are_ready - check if all ports in an aggregator are ready 704 * @aggregator: the aggregator we're looking at 705 * 706 */ 707 static int __agg_ports_are_ready(struct aggregator *aggregator) 708 { 709 struct port *port; 710 int retval = 1; 711 712 if (aggregator) { 713 /* scan all ports in this aggregator to verfy if they are 714 * all ready. 715 */ 716 for (port = aggregator->lag_ports; 717 port; 718 port = port->next_port_in_aggregator) { 719 if (!(port->sm_vars & AD_PORT_READY_N)) { 720 retval = 0; 721 break; 722 } 723 } 724 } 725 726 return retval; 727 } 728 729 /** 730 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator 731 * @aggregator: the aggregator we're looking at 732 * @val: Should the ports' ready bit be set on or off 733 * 734 */ 735 static void __set_agg_ports_ready(struct aggregator *aggregator, int val) 736 { 737 struct port *port; 738 739 for (port = aggregator->lag_ports; port; 740 port = port->next_port_in_aggregator) { 741 if (val) 742 port->sm_vars |= AD_PORT_READY; 743 else 744 port->sm_vars &= ~AD_PORT_READY; 745 } 746 } 747 748 static int __agg_active_ports(struct aggregator *agg) 749 { 750 struct port *port; 751 int active = 0; 752 753 for (port = agg->lag_ports; port; 754 port = port->next_port_in_aggregator) { 755 if (port->is_enabled) 756 active++; 757 } 758 759 return active; 760 } 761 762 static unsigned int __agg_ports_priority(const struct aggregator *agg) 763 { 764 struct port *port = agg->lag_ports; 765 unsigned int prio = 0; 766 767 for (; port; port = port->next_port_in_aggregator) 768 if (port->is_enabled) 769 prio += port->actor_port_priority; 770 771 return prio; 772 } 773 774 /** 775 * __get_agg_bandwidth - get the total bandwidth of an aggregator 776 * @aggregator: the aggregator we're looking at 777 * 778 */ 779 static u32 __get_agg_bandwidth(struct aggregator *aggregator) 780 { 781 int nports = __agg_active_ports(aggregator); 782 u32 bandwidth = 0; 783 784 if (nports) { 785 switch (__get_link_speed(aggregator->lag_ports)) { 786 case AD_LINK_SPEED_1MBPS: 787 bandwidth = nports; 788 break; 789 case AD_LINK_SPEED_10MBPS: 790 bandwidth = nports * 10; 791 break; 792 case AD_LINK_SPEED_100MBPS: 793 bandwidth = nports * 100; 794 break; 795 case AD_LINK_SPEED_1000MBPS: 796 bandwidth = nports * 1000; 797 break; 798 case AD_LINK_SPEED_2500MBPS: 799 bandwidth = nports * 2500; 800 break; 801 case AD_LINK_SPEED_5000MBPS: 802 bandwidth = nports * 5000; 803 break; 804 case AD_LINK_SPEED_10000MBPS: 805 bandwidth = nports * 10000; 806 break; 807 case AD_LINK_SPEED_14000MBPS: 808 bandwidth = nports * 14000; 809 break; 810 case AD_LINK_SPEED_20000MBPS: 811 bandwidth = nports * 20000; 812 break; 813 case AD_LINK_SPEED_25000MBPS: 814 bandwidth = nports * 25000; 815 break; 816 case AD_LINK_SPEED_40000MBPS: 817 bandwidth = nports * 40000; 818 break; 819 case AD_LINK_SPEED_50000MBPS: 820 bandwidth = nports * 50000; 821 break; 822 case AD_LINK_SPEED_56000MBPS: 823 bandwidth = nports * 56000; 824 break; 825 case AD_LINK_SPEED_80000MBPS: 826 bandwidth = nports * 80000; 827 break; 828 case AD_LINK_SPEED_100000MBPS: 829 bandwidth = nports * 100000; 830 break; 831 case AD_LINK_SPEED_200000MBPS: 832 bandwidth = nports * 200000; 833 break; 834 case AD_LINK_SPEED_400000MBPS: 835 bandwidth = nports * 400000; 836 break; 837 case AD_LINK_SPEED_800000MBPS: 838 bandwidth = nports * 800000; 839 break; 840 case AD_LINK_SPEED_1600000MBPS: 841 bandwidth = nports * 1600000; 842 break; 843 default: 844 bandwidth = 0; /* to silence the compiler */ 845 } 846 } 847 return bandwidth; 848 } 849 850 /** 851 * __get_active_agg - get the current active aggregator 852 * @aggregator: the aggregator we're looking at 853 * 854 * Caller must hold RCU lock. 855 */ 856 static struct aggregator *__get_active_agg(struct aggregator *aggregator) 857 { 858 struct bonding *bond = aggregator->slave->bond; 859 struct list_head *iter; 860 struct slave *slave; 861 862 bond_for_each_slave_rcu(bond, slave, iter) 863 if (SLAVE_AD_INFO(slave)->aggregator.is_active) 864 return &(SLAVE_AD_INFO(slave)->aggregator); 865 866 return NULL; 867 } 868 869 /** 870 * __update_lacpdu_from_port - update a port's lacpdu fields 871 * @port: the port we're looking at 872 */ 873 static inline void __update_lacpdu_from_port(struct port *port) 874 { 875 struct lacpdu *lacpdu = &port->lacpdu; 876 const struct port_params *partner = &port->partner_oper; 877 878 /* update current actual Actor parameters 879 * lacpdu->subtype initialized 880 * lacpdu->version_number initialized 881 * lacpdu->tlv_type_actor_info initialized 882 * lacpdu->actor_information_length initialized 883 */ 884 885 lacpdu->actor_system_priority = htons(port->actor_system_priority); 886 lacpdu->actor_system = port->actor_system; 887 lacpdu->actor_key = htons(port->actor_oper_port_key); 888 lacpdu->actor_port_priority = htons(port->actor_port_priority); 889 lacpdu->actor_port = htons(port->actor_port_number); 890 lacpdu->actor_state = port->actor_oper_port_state; 891 slave_dbg(port->slave->bond->dev, port->slave->dev, 892 "update lacpdu: actor port state %x\n", 893 port->actor_oper_port_state); 894 895 /* lacpdu->reserved_3_1 initialized 896 * lacpdu->tlv_type_partner_info initialized 897 * lacpdu->partner_information_length initialized 898 */ 899 900 lacpdu->partner_system_priority = htons(partner->system_priority); 901 lacpdu->partner_system = partner->system; 902 lacpdu->partner_key = htons(partner->key); 903 lacpdu->partner_port_priority = htons(partner->port_priority); 904 lacpdu->partner_port = htons(partner->port_number); 905 lacpdu->partner_state = partner->port_state; 906 907 /* lacpdu->reserved_3_2 initialized 908 * lacpdu->tlv_type_collector_info initialized 909 * lacpdu->collector_information_length initialized 910 * collector_max_delay initialized 911 * reserved_12[12] initialized 912 * tlv_type_terminator initialized 913 * terminator_length initialized 914 * reserved_50[50] initialized 915 */ 916 } 917 918 /* ================= main 802.3ad protocol code ========================= */ 919 920 /** 921 * ad_lacpdu_send - send out a lacpdu packet on a given port 922 * @port: the port we're looking at 923 * 924 * Returns: 0 on success 925 * < 0 on error 926 */ 927 static int ad_lacpdu_send(struct port *port) 928 { 929 struct slave *slave = port->slave; 930 struct sk_buff *skb; 931 struct lacpdu_header *lacpdu_header; 932 int length = sizeof(struct lacpdu_header); 933 934 skb = dev_alloc_skb(length); 935 if (!skb) 936 return -ENOMEM; 937 938 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx); 939 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx); 940 941 skb->dev = slave->dev; 942 skb_reset_mac_header(skb); 943 skb->network_header = skb->mac_header + ETH_HLEN; 944 skb->protocol = PKT_TYPE_LACPDU; 945 skb->priority = TC_PRIO_CONTROL; 946 947 lacpdu_header = skb_put(skb, length); 948 949 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr); 950 /* Note: source address is set to be the member's PERMANENT address, 951 * because we use it to identify loopback lacpdus in receive. 952 */ 953 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr); 954 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU; 955 956 lacpdu_header->lacpdu = port->lacpdu; 957 958 dev_queue_xmit(skb); 959 960 return 0; 961 } 962 963 /** 964 * ad_marker_send - send marker information/response on a given port 965 * @port: the port we're looking at 966 * @marker: marker data to send 967 * 968 * Returns: 0 on success 969 * < 0 on error 970 */ 971 static int ad_marker_send(struct port *port, struct bond_marker *marker) 972 { 973 struct slave *slave = port->slave; 974 struct sk_buff *skb; 975 struct bond_marker_header *marker_header; 976 int length = sizeof(struct bond_marker_header); 977 978 skb = dev_alloc_skb(length + 16); 979 if (!skb) 980 return -ENOMEM; 981 982 switch (marker->tlv_type) { 983 case AD_MARKER_INFORMATION_SUBTYPE: 984 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx); 985 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx); 986 break; 987 case AD_MARKER_RESPONSE_SUBTYPE: 988 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx); 989 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx); 990 break; 991 } 992 993 skb_reserve(skb, 16); 994 995 skb->dev = slave->dev; 996 skb_reset_mac_header(skb); 997 skb->network_header = skb->mac_header + ETH_HLEN; 998 skb->protocol = PKT_TYPE_LACPDU; 999 1000 marker_header = skb_put(skb, length); 1001 1002 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr); 1003 /* Note: source address is set to be the member's PERMANENT address, 1004 * because we use it to identify loopback MARKERs in receive. 1005 */ 1006 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr); 1007 marker_header->hdr.h_proto = PKT_TYPE_LACPDU; 1008 1009 marker_header->marker = *marker; 1010 1011 dev_queue_xmit(skb); 1012 1013 return 0; 1014 } 1015 1016 static void ad_cond_set_peer_notif(struct port *port) 1017 { 1018 struct bonding *bond = port->slave->bond; 1019 1020 if (bond->params.broadcast_neighbor) 1021 bond_peer_notify_work_rearm(bond, 0); 1022 } 1023 1024 /** 1025 * ad_mux_machine - handle a port's mux state machine 1026 * @port: the port we're looking at 1027 * @update_slave_arr: Does slave array need update? 1028 */ 1029 static void ad_mux_machine(struct port *port, bool *update_slave_arr) 1030 { 1031 struct bonding *bond = __get_bond_by_port(port); 1032 mux_states_t last_state; 1033 1034 /* keep current State Machine state to compare later if it was 1035 * changed 1036 */ 1037 last_state = port->sm_mux_state; 1038 1039 if (port->sm_vars & AD_PORT_BEGIN) { 1040 port->sm_mux_state = AD_MUX_DETACHED; 1041 } else { 1042 switch (port->sm_mux_state) { 1043 case AD_MUX_DETACHED: 1044 if ((port->sm_vars & AD_PORT_SELECTED) 1045 || (port->sm_vars & AD_PORT_STANDBY)) 1046 /* if SELECTED or STANDBY */ 1047 port->sm_mux_state = AD_MUX_WAITING; 1048 break; 1049 case AD_MUX_WAITING: 1050 /* if SELECTED == FALSE return to DETACH state */ 1051 if (!(port->sm_vars & AD_PORT_SELECTED)) { 1052 port->sm_vars &= ~AD_PORT_READY_N; 1053 /* in order to withhold the Selection Logic to 1054 * check all ports READY_N value every callback 1055 * cycle to update ready variable, we check 1056 * READY_N and update READY here 1057 */ 1058 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 1059 port->sm_mux_state = AD_MUX_DETACHED; 1060 break; 1061 } 1062 1063 /* check if the wait_while_timer expired */ 1064 if (port->sm_mux_timer_counter 1065 && !(--port->sm_mux_timer_counter)) 1066 port->sm_vars |= AD_PORT_READY_N; 1067 1068 /* in order to withhold the selection logic to check 1069 * all ports READY_N value every callback cycle to 1070 * update ready variable, we check READY_N and update 1071 * READY here 1072 */ 1073 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 1074 1075 /* if the wait_while_timer expired, and the port is 1076 * in READY state, move to ATTACHED state 1077 */ 1078 if ((port->sm_vars & AD_PORT_READY) 1079 && !port->sm_mux_timer_counter) 1080 port->sm_mux_state = AD_MUX_ATTACHED; 1081 break; 1082 case AD_MUX_ATTACHED: 1083 /* check also if agg_select_timer expired (so the 1084 * edable port will take place only after this timer) 1085 */ 1086 if ((port->sm_vars & AD_PORT_SELECTED) && 1087 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) && 1088 !__check_agg_selection_timer(port)) { 1089 if (port->aggregator->is_active) { 1090 int state = AD_MUX_COLLECTING_DISTRIBUTING; 1091 1092 if (!bond->params.coupled_control) 1093 state = AD_MUX_COLLECTING; 1094 port->sm_mux_state = state; 1095 } 1096 } else if (!(port->sm_vars & AD_PORT_SELECTED) || 1097 (port->sm_vars & AD_PORT_STANDBY)) { 1098 /* if UNSELECTED or STANDBY */ 1099 port->sm_vars &= ~AD_PORT_READY_N; 1100 /* in order to withhold the selection logic to 1101 * check all ports READY_N value every callback 1102 * cycle to update ready variable, we check 1103 * READY_N and update READY here 1104 */ 1105 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 1106 port->sm_mux_state = AD_MUX_DETACHED; 1107 } else if (port->aggregator->is_active) { 1108 port->actor_oper_port_state |= 1109 LACP_STATE_SYNCHRONIZATION; 1110 } 1111 break; 1112 case AD_MUX_COLLECTING_DISTRIBUTING: 1113 if (!__port_move_to_attached_state(port)) { 1114 /* if port state hasn't changed make 1115 * sure that a collecting distributing 1116 * port in an active aggregator is enabled 1117 */ 1118 if (port->aggregator->is_active && 1119 !__port_is_collecting_distributing(port)) { 1120 __enable_port(port); 1121 *update_slave_arr = true; 1122 } 1123 } 1124 break; 1125 case AD_MUX_COLLECTING: 1126 if (!__port_move_to_attached_state(port)) { 1127 if ((port->sm_vars & AD_PORT_SELECTED) && 1128 (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) && 1129 (port->partner_oper.port_state & LACP_STATE_COLLECTING)) { 1130 port->sm_mux_state = AD_MUX_DISTRIBUTING; 1131 } else { 1132 /* If port state hasn't changed, make sure that a collecting 1133 * port is enabled for an active aggregator. 1134 */ 1135 struct slave *slave = port->slave; 1136 1137 if (port->aggregator->is_active && 1138 bond_is_slave_rx_disabled(slave)) { 1139 ad_enable_collecting(port); 1140 *update_slave_arr = true; 1141 } 1142 } 1143 } 1144 break; 1145 case AD_MUX_DISTRIBUTING: 1146 if (!(port->sm_vars & AD_PORT_SELECTED) || 1147 (port->sm_vars & AD_PORT_STANDBY) || 1148 !(port->partner_oper.port_state & LACP_STATE_COLLECTING) || 1149 !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) || 1150 !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) { 1151 port->sm_mux_state = AD_MUX_COLLECTING; 1152 } else { 1153 /* if port state hasn't changed make 1154 * sure that a collecting distributing 1155 * port in an active aggregator is enabled 1156 */ 1157 if (port->aggregator && 1158 port->aggregator->is_active && 1159 !__port_is_collecting_distributing(port)) { 1160 __enable_port(port); 1161 *update_slave_arr = true; 1162 } 1163 } 1164 break; 1165 default: 1166 break; 1167 } 1168 } 1169 1170 /* check if the state machine was changed */ 1171 if (port->sm_mux_state != last_state) { 1172 slave_dbg(port->slave->bond->dev, port->slave->dev, 1173 "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", 1174 port->actor_port_number, 1175 last_state, 1176 port->sm_mux_state); 1177 switch (port->sm_mux_state) { 1178 case AD_MUX_DETACHED: 1179 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; 1180 ad_disable_collecting_distributing(port, 1181 update_slave_arr); 1182 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; 1183 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 1184 port->ntt = true; 1185 break; 1186 case AD_MUX_WAITING: 1187 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0); 1188 break; 1189 case AD_MUX_ATTACHED: 1190 if (port->aggregator->is_active) 1191 port->actor_oper_port_state |= 1192 LACP_STATE_SYNCHRONIZATION; 1193 else 1194 port->actor_oper_port_state &= 1195 ~LACP_STATE_SYNCHRONIZATION; 1196 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; 1197 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 1198 ad_disable_collecting_distributing(port, 1199 update_slave_arr); 1200 port->ntt = true; 1201 break; 1202 case AD_MUX_COLLECTING_DISTRIBUTING: 1203 port->actor_oper_port_state |= LACP_STATE_COLLECTING; 1204 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING; 1205 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION; 1206 ad_enable_collecting_distributing(port, 1207 update_slave_arr); 1208 port->ntt = true; 1209 break; 1210 case AD_MUX_COLLECTING: 1211 port->actor_oper_port_state |= LACP_STATE_COLLECTING; 1212 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 1213 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION; 1214 ad_enable_collecting(port); 1215 ad_disable_distributing(port, update_slave_arr); 1216 port->ntt = true; 1217 break; 1218 case AD_MUX_DISTRIBUTING: 1219 port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING; 1220 port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION; 1221 ad_enable_collecting_distributing(port, 1222 update_slave_arr); 1223 break; 1224 default: 1225 break; 1226 } 1227 } 1228 } 1229 1230 /** 1231 * ad_rx_machine - handle a port's rx State Machine 1232 * @lacpdu: the lacpdu we've received 1233 * @port: the port we're looking at 1234 * 1235 * If lacpdu arrived, stop previous timer (if exists) and set the next state as 1236 * CURRENT. If timer expired set the state machine in the proper state. 1237 * In other cases, this function checks if we need to switch to other state. 1238 */ 1239 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port) 1240 { 1241 rx_states_t last_state; 1242 1243 /* keep current State Machine state to compare later if it was 1244 * changed 1245 */ 1246 last_state = port->sm_rx_state; 1247 1248 if (lacpdu) { 1249 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx); 1250 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx); 1251 } 1252 /* check if state machine should change state */ 1253 1254 /* first, check if port was reinitialized */ 1255 if (port->sm_vars & AD_PORT_BEGIN) { 1256 port->sm_rx_state = AD_RX_INITIALIZE; 1257 port->sm_vars |= AD_PORT_CHURNED; 1258 /* check if port is not enabled */ 1259 } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled) 1260 port->sm_rx_state = AD_RX_PORT_DISABLED; 1261 /* check if new lacpdu arrived */ 1262 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || 1263 (port->sm_rx_state == AD_RX_DEFAULTED) || 1264 (port->sm_rx_state == AD_RX_CURRENT))) { 1265 if (port->sm_rx_state != AD_RX_CURRENT) 1266 port->sm_vars |= AD_PORT_CHURNED; 1267 port->sm_rx_timer_counter = 0; 1268 port->sm_rx_state = AD_RX_CURRENT; 1269 } else { 1270 /* if timer is on, and if it is expired */ 1271 if (port->sm_rx_timer_counter && 1272 !(--port->sm_rx_timer_counter)) { 1273 switch (port->sm_rx_state) { 1274 case AD_RX_EXPIRED: 1275 port->sm_rx_state = AD_RX_DEFAULTED; 1276 break; 1277 case AD_RX_CURRENT: 1278 port->sm_rx_state = AD_RX_EXPIRED; 1279 break; 1280 default: 1281 break; 1282 } 1283 } else { 1284 /* if no lacpdu arrived and no timer is on */ 1285 switch (port->sm_rx_state) { 1286 case AD_RX_PORT_DISABLED: 1287 if (port->is_enabled && 1288 (port->sm_vars & AD_PORT_LACP_ENABLED)) 1289 port->sm_rx_state = AD_RX_EXPIRED; 1290 else if (port->is_enabled 1291 && ((port->sm_vars 1292 & AD_PORT_LACP_ENABLED) == 0)) 1293 port->sm_rx_state = AD_RX_LACP_DISABLED; 1294 break; 1295 default: 1296 break; 1297 1298 } 1299 } 1300 } 1301 1302 /* check if the State machine was changed or new lacpdu arrived */ 1303 if ((port->sm_rx_state != last_state) || (lacpdu)) { 1304 slave_dbg(port->slave->bond->dev, port->slave->dev, 1305 "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", 1306 port->actor_port_number, 1307 last_state, 1308 port->sm_rx_state); 1309 switch (port->sm_rx_state) { 1310 case AD_RX_INITIALIZE: 1311 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)) 1312 port->sm_vars &= ~AD_PORT_LACP_ENABLED; 1313 else 1314 port->sm_vars |= AD_PORT_LACP_ENABLED; 1315 port->sm_vars &= ~AD_PORT_SELECTED; 1316 __record_default(port); 1317 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1318 port->sm_rx_state = AD_RX_PORT_DISABLED; 1319 1320 fallthrough; 1321 case AD_RX_PORT_DISABLED: 1322 port->sm_vars &= ~AD_PORT_MATCHED; 1323 break; 1324 case AD_RX_LACP_DISABLED: 1325 port->sm_vars &= ~AD_PORT_SELECTED; 1326 __record_default(port); 1327 port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION; 1328 port->sm_vars |= AD_PORT_MATCHED; 1329 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1330 break; 1331 case AD_RX_EXPIRED: 1332 /* Reset of the Synchronization flag (Standard 43.4.12) 1333 * This reset cause to disable this port in the 1334 * COLLECTING_DISTRIBUTING state of the mux machine in 1335 * case of EXPIRED even if LINK_DOWN didn't arrive for 1336 * the port. 1337 */ 1338 port->sm_vars &= ~AD_PORT_MATCHED; 1339 /* Based on IEEE 8021AX-2014, Figure 6-18 - Receive 1340 * machine state diagram, the statue should be 1341 * Partner_Oper_Port_State.Synchronization = FALSE; 1342 * Partner_Oper_Port_State.LACP_Timeout = Short Timeout; 1343 * start current_while_timer(Short Timeout); 1344 * Actor_Oper_Port_State.Expired = TRUE; 1345 */ 1346 port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION; 1347 port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT; 1348 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT)); 1349 port->actor_oper_port_state |= LACP_STATE_EXPIRED; 1350 port->sm_vars |= AD_PORT_CHURNED; 1351 break; 1352 case AD_RX_DEFAULTED: 1353 __update_default_selected(port); 1354 __record_default(port); 1355 port->sm_vars |= AD_PORT_MATCHED; 1356 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1357 break; 1358 case AD_RX_CURRENT: 1359 /* detect loopback situation */ 1360 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system), 1361 &(port->actor_system))) { 1362 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n" 1363 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n"); 1364 return; 1365 } 1366 __update_selected(lacpdu, port); 1367 __update_ntt(lacpdu, port); 1368 __record_pdu(lacpdu, port); 1369 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)); 1370 port->actor_oper_port_state &= ~LACP_STATE_EXPIRED; 1371 break; 1372 default: 1373 break; 1374 } 1375 } 1376 } 1377 1378 /** 1379 * ad_churn_machine - handle port churn's state machine 1380 * @port: the port we're looking at 1381 * 1382 */ 1383 static void ad_churn_machine(struct port *port) 1384 { 1385 if (port->sm_vars & AD_PORT_CHURNED) { 1386 port->sm_vars &= ~AD_PORT_CHURNED; 1387 port->sm_churn_actor_state = AD_CHURN_MONITOR; 1388 port->sm_churn_partner_state = AD_CHURN_MONITOR; 1389 port->sm_churn_actor_timer_counter = 1390 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0); 1391 port->sm_churn_partner_timer_counter = 1392 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0); 1393 return; 1394 } 1395 if (port->sm_churn_actor_timer_counter && 1396 !(--port->sm_churn_actor_timer_counter) && 1397 port->sm_churn_actor_state == AD_CHURN_MONITOR) { 1398 if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) { 1399 port->sm_churn_actor_state = AD_NO_CHURN; 1400 } else { 1401 port->churn_actor_count++; 1402 port->sm_churn_actor_state = AD_CHURN; 1403 } 1404 } 1405 if (port->sm_churn_partner_timer_counter && 1406 !(--port->sm_churn_partner_timer_counter) && 1407 port->sm_churn_partner_state == AD_CHURN_MONITOR) { 1408 if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) { 1409 port->sm_churn_partner_state = AD_NO_CHURN; 1410 } else { 1411 port->churn_partner_count++; 1412 port->sm_churn_partner_state = AD_CHURN; 1413 } 1414 } 1415 } 1416 1417 /** 1418 * ad_tx_machine - handle a port's tx state machine 1419 * @port: the port we're looking at 1420 */ 1421 static void ad_tx_machine(struct port *port) 1422 { 1423 /* check if tx timer expired, to verify that we do not send more than 1424 * 3 packets per second 1425 */ 1426 if (!port->sm_tx_timer_counter || !(--port->sm_tx_timer_counter)) { 1427 /* check if there is something to send */ 1428 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) { 1429 __update_lacpdu_from_port(port); 1430 1431 if (ad_lacpdu_send(port) >= 0) { 1432 slave_dbg(port->slave->bond->dev, 1433 port->slave->dev, 1434 "Sent LACPDU on port %d\n", 1435 port->actor_port_number); 1436 1437 /* mark ntt as false, so it will not be sent 1438 * again until demanded 1439 */ 1440 port->ntt = false; 1441 1442 /* restart tx timer(to verify that we will not 1443 * exceed AD_MAX_TX_IN_SECOND 1444 */ 1445 port->sm_tx_timer_counter = ad_ticks_per_sec / AD_MAX_TX_IN_SECOND; 1446 } 1447 } 1448 } 1449 } 1450 1451 /** 1452 * ad_periodic_machine - handle a port's periodic state machine 1453 * @port: the port we're looking at 1454 * 1455 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's. 1456 */ 1457 static void ad_periodic_machine(struct port *port) 1458 { 1459 periodic_states_t last_state; 1460 1461 /* keep current state machine state to compare later if it was changed */ 1462 last_state = port->sm_periodic_state; 1463 1464 /* check if port was reinitialized */ 1465 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) || 1466 (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY))) { 1467 port->sm_periodic_state = AD_NO_PERIODIC; 1468 } 1469 /* check if state machine should change state */ 1470 else if (port->sm_periodic_timer_counter) { 1471 /* check if periodic state machine expired */ 1472 if (!(--port->sm_periodic_timer_counter)) { 1473 /* if expired then do tx */ 1474 port->sm_periodic_state = AD_PERIODIC_TX; 1475 } else { 1476 /* If not expired, check if there is some new timeout 1477 * parameter from the partner state 1478 */ 1479 switch (port->sm_periodic_state) { 1480 case AD_FAST_PERIODIC: 1481 if (!(port->partner_oper.port_state 1482 & LACP_STATE_LACP_TIMEOUT)) 1483 port->sm_periodic_state = AD_SLOW_PERIODIC; 1484 break; 1485 case AD_SLOW_PERIODIC: 1486 if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) { 1487 port->sm_periodic_timer_counter = 0; 1488 port->sm_periodic_state = AD_PERIODIC_TX; 1489 } 1490 break; 1491 default: 1492 break; 1493 } 1494 } 1495 } else { 1496 switch (port->sm_periodic_state) { 1497 case AD_NO_PERIODIC: 1498 port->sm_periodic_state = AD_FAST_PERIODIC; 1499 break; 1500 case AD_PERIODIC_TX: 1501 if (!(port->partner_oper.port_state & 1502 LACP_STATE_LACP_TIMEOUT)) 1503 port->sm_periodic_state = AD_SLOW_PERIODIC; 1504 else 1505 port->sm_periodic_state = AD_FAST_PERIODIC; 1506 break; 1507 default: 1508 break; 1509 } 1510 } 1511 1512 /* check if the state machine was changed */ 1513 if (port->sm_periodic_state != last_state) { 1514 slave_dbg(port->slave->bond->dev, port->slave->dev, 1515 "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", 1516 port->actor_port_number, last_state, 1517 port->sm_periodic_state); 1518 switch (port->sm_periodic_state) { 1519 case AD_NO_PERIODIC: 1520 port->sm_periodic_timer_counter = 0; 1521 break; 1522 case AD_FAST_PERIODIC: 1523 /* decrement 1 tick we lost in the PERIODIC_TX cycle */ 1524 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; 1525 break; 1526 case AD_SLOW_PERIODIC: 1527 /* decrement 1 tick we lost in the PERIODIC_TX cycle */ 1528 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; 1529 break; 1530 case AD_PERIODIC_TX: 1531 port->ntt = true; 1532 break; 1533 default: 1534 break; 1535 } 1536 } 1537 } 1538 1539 /** 1540 * ad_port_selection_logic - select aggregation groups 1541 * @port: the port we're looking at 1542 * @update_slave_arr: Does slave array need update? 1543 * 1544 * Select aggregation groups, and assign each port for it's aggregetor. The 1545 * selection logic is called in the inititalization (after all the handshkes), 1546 * and after every lacpdu receive (if selected is off). 1547 */ 1548 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr) 1549 { 1550 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator; 1551 struct port *last_port = NULL, *curr_port; 1552 struct list_head *iter; 1553 struct bonding *bond; 1554 struct slave *slave; 1555 int found = 0; 1556 1557 /* if the port is already Selected, do nothing */ 1558 if (port->sm_vars & AD_PORT_SELECTED) 1559 return; 1560 1561 bond = __get_bond_by_port(port); 1562 1563 /* if the port is connected to other aggregator, detach it */ 1564 if (port->aggregator) { 1565 /* detach the port from its former aggregator */ 1566 temp_aggregator = port->aggregator; 1567 for (curr_port = temp_aggregator->lag_ports; curr_port; 1568 last_port = curr_port, 1569 curr_port = curr_port->next_port_in_aggregator) { 1570 if (curr_port == port) { 1571 temp_aggregator->num_of_ports--; 1572 /* if it is the first port attached to the 1573 * aggregator 1574 */ 1575 if (!last_port) { 1576 temp_aggregator->lag_ports = 1577 port->next_port_in_aggregator; 1578 } else { 1579 /* not the first port attached to the 1580 * aggregator 1581 */ 1582 last_port->next_port_in_aggregator = 1583 port->next_port_in_aggregator; 1584 } 1585 1586 /* clear the port's relations to this 1587 * aggregator 1588 */ 1589 port->aggregator = NULL; 1590 port->next_port_in_aggregator = NULL; 1591 port->actor_port_aggregator_identifier = 0; 1592 1593 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n", 1594 port->actor_port_number, 1595 temp_aggregator->aggregator_identifier); 1596 /* if the aggregator is empty, clear its 1597 * parameters, and set it ready to be attached 1598 */ 1599 if (!temp_aggregator->lag_ports) 1600 ad_clear_agg(temp_aggregator); 1601 break; 1602 } 1603 } 1604 if (!curr_port) { 1605 /* meaning: the port was related to an aggregator 1606 * but was not on the aggregator port list 1607 */ 1608 net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n", 1609 port->slave->bond->dev->name, 1610 port->slave->dev->name, 1611 port->actor_port_number, 1612 port->aggregator->aggregator_identifier); 1613 } 1614 } 1615 /* search on all aggregators for a suitable aggregator for this port */ 1616 bond_for_each_slave(bond, slave, iter) { 1617 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 1618 1619 /* keep a free aggregator for later use(if needed) */ 1620 if (!aggregator->lag_ports) { 1621 if (!free_aggregator) 1622 free_aggregator = aggregator; 1623 continue; 1624 } 1625 /* check if current aggregator suits us */ 1626 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */ 1627 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) && 1628 (aggregator->partner_system_priority == port->partner_oper.system_priority) && 1629 (aggregator->partner_oper_aggregator_key == port->partner_oper.key) 1630 ) && 1631 ((__agg_has_partner(aggregator) && /* partner answers */ 1632 !aggregator->is_individual) /* but is not individual OR */ 1633 ) 1634 ) { 1635 /* attach to the founded aggregator */ 1636 port->aggregator = aggregator; 1637 port->actor_port_aggregator_identifier = 1638 port->aggregator->aggregator_identifier; 1639 port->next_port_in_aggregator = aggregator->lag_ports; 1640 port->aggregator->num_of_ports++; 1641 aggregator->lag_ports = port; 1642 slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n", 1643 port->actor_port_number, 1644 port->aggregator->aggregator_identifier); 1645 1646 /* mark this port as selected */ 1647 port->sm_vars |= AD_PORT_SELECTED; 1648 found = 1; 1649 break; 1650 } 1651 } 1652 1653 /* the port couldn't find an aggregator - attach it to a new 1654 * aggregator 1655 */ 1656 if (!found) { 1657 if (free_aggregator) { 1658 /* assign port a new aggregator */ 1659 port->aggregator = free_aggregator; 1660 port->actor_port_aggregator_identifier = 1661 port->aggregator->aggregator_identifier; 1662 1663 /* update the new aggregator's parameters 1664 * if port was responsed from the end-user 1665 */ 1666 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS) 1667 /* if port is full duplex */ 1668 port->aggregator->is_individual = false; 1669 else 1670 port->aggregator->is_individual = true; 1671 1672 port->aggregator->actor_admin_aggregator_key = 1673 port->actor_admin_port_key; 1674 port->aggregator->actor_oper_aggregator_key = 1675 port->actor_oper_port_key; 1676 port->aggregator->partner_system = 1677 port->partner_oper.system; 1678 port->aggregator->partner_system_priority = 1679 port->partner_oper.system_priority; 1680 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key; 1681 port->aggregator->receive_state = 1; 1682 port->aggregator->transmit_state = 1; 1683 port->aggregator->lag_ports = port; 1684 port->aggregator->num_of_ports++; 1685 1686 /* mark this port as selected */ 1687 port->sm_vars |= AD_PORT_SELECTED; 1688 1689 slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n", 1690 port->actor_port_number, 1691 port->aggregator->aggregator_identifier); 1692 } else { 1693 slave_err(bond->dev, port->slave->dev, 1694 "Port %d did not find a suitable aggregator\n", 1695 port->actor_port_number); 1696 return; 1697 } 1698 } 1699 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE 1700 * in all aggregator's ports, else set ready=FALSE in all 1701 * aggregator's ports 1702 */ 1703 __set_agg_ports_ready(port->aggregator, 1704 __agg_ports_are_ready(port->aggregator)); 1705 1706 aggregator = __get_first_agg(port); 1707 ad_agg_selection_logic(aggregator, update_slave_arr); 1708 1709 if (!port->aggregator->is_active) 1710 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; 1711 } 1712 1713 /* Decide if "agg" is a better choice for the new active aggregator that 1714 * the current best, according to the ad_select policy. 1715 */ 1716 static struct aggregator *ad_agg_selection_test(struct aggregator *best, 1717 struct aggregator *curr) 1718 { 1719 /* 0. If no best, select current. 1720 * 1721 * 1. If the current agg is not individual, and the best is 1722 * individual, select current. 1723 * 1724 * 2. If current agg is individual and the best is not, keep best. 1725 * 1726 * 3. Therefore, current and best are both individual or both not 1727 * individual, so: 1728 * 1729 * 3a. If current agg partner replied, and best agg partner did not, 1730 * select current. 1731 * 1732 * 3b. If current agg partner did not reply and best agg partner 1733 * did reply, keep best. 1734 * 1735 * 4. Therefore, current and best both have partner replies or 1736 * both do not, so perform selection policy: 1737 * 1738 * BOND_AD_PRIO: Select by total priority of ports. If priority 1739 * is equal, select by count. 1740 * 1741 * BOND_AD_COUNT: Select by count of ports. If count is equal, 1742 * select by bandwidth. 1743 * 1744 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth. 1745 */ 1746 if (!best) 1747 return curr; 1748 1749 if (!curr->is_individual && best->is_individual) 1750 return curr; 1751 1752 if (curr->is_individual && !best->is_individual) 1753 return best; 1754 1755 if (__agg_has_partner(curr) && !__agg_has_partner(best)) 1756 return curr; 1757 1758 if (!__agg_has_partner(curr) && __agg_has_partner(best)) 1759 return best; 1760 1761 switch (__get_agg_selection_mode(curr->lag_ports)) { 1762 case BOND_AD_PRIO: 1763 if (__agg_ports_priority(curr) > __agg_ports_priority(best)) 1764 return curr; 1765 1766 if (__agg_ports_priority(curr) < __agg_ports_priority(best)) 1767 return best; 1768 1769 fallthrough; 1770 case BOND_AD_COUNT: 1771 if (__agg_active_ports(curr) > __agg_active_ports(best)) 1772 return curr; 1773 1774 if (__agg_active_ports(curr) < __agg_active_ports(best)) 1775 return best; 1776 1777 fallthrough; 1778 case BOND_AD_STABLE: 1779 case BOND_AD_BANDWIDTH: 1780 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best)) 1781 return curr; 1782 1783 break; 1784 1785 default: 1786 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n", 1787 curr->slave->bond->dev->name, 1788 curr->slave->dev->name, 1789 __get_agg_selection_mode(curr->lag_ports)); 1790 break; 1791 } 1792 1793 return best; 1794 } 1795 1796 static int agg_device_up(const struct aggregator *agg) 1797 { 1798 struct port *port = agg->lag_ports; 1799 1800 if (!port) 1801 return 0; 1802 1803 for (port = agg->lag_ports; port; 1804 port = port->next_port_in_aggregator) { 1805 if (netif_running(port->slave->dev) && 1806 netif_carrier_ok(port->slave->dev)) 1807 return 1; 1808 } 1809 1810 return 0; 1811 } 1812 1813 /** 1814 * ad_agg_selection_logic - select an aggregation group for a team 1815 * @agg: the aggregator we're looking at 1816 * @update_slave_arr: Does slave array need update? 1817 * 1818 * It is assumed that only one aggregator may be selected for a team. 1819 * 1820 * The logic of this function is to select the aggregator according to 1821 * the ad_select policy: 1822 * 1823 * BOND_AD_STABLE: select the aggregator with the most ports attached to 1824 * it, and to reselect the active aggregator only if the previous 1825 * aggregator has no more ports related to it. 1826 * 1827 * BOND_AD_BANDWIDTH: select the aggregator with the highest total 1828 * bandwidth, and reselect whenever a link state change takes place or the 1829 * set of slaves in the bond changes. 1830 * 1831 * BOND_AD_COUNT: select the aggregator with largest number of ports 1832 * (slaves), and reselect whenever a link state change takes place or the 1833 * set of slaves in the bond changes. 1834 * 1835 * BOND_AD_PRIO: select the aggregator with highest total priority of ports 1836 * (slaves), and reselect whenever a link state change takes place or the 1837 * set of slaves in the bond changes. 1838 * 1839 * FIXME: this function MUST be called with the first agg in the bond, or 1840 * __get_active_agg() won't work correctly. This function should be better 1841 * called with the bond itself, and retrieve the first agg from it. 1842 */ 1843 static void ad_agg_selection_logic(struct aggregator *agg, 1844 bool *update_slave_arr) 1845 { 1846 struct aggregator *best, *active, *origin; 1847 struct bonding *bond = agg->slave->bond; 1848 struct list_head *iter; 1849 struct slave *slave; 1850 struct port *port; 1851 1852 rcu_read_lock(); 1853 origin = agg; 1854 active = __get_active_agg(agg); 1855 best = (active && agg_device_up(active)) ? active : NULL; 1856 1857 bond_for_each_slave_rcu(bond, slave, iter) { 1858 agg = &(SLAVE_AD_INFO(slave)->aggregator); 1859 1860 agg->is_active = 0; 1861 1862 if (__agg_active_ports(agg) && agg_device_up(agg)) 1863 best = ad_agg_selection_test(best, agg); 1864 } 1865 1866 if (best && 1867 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) { 1868 /* For the STABLE policy, don't replace the old active 1869 * aggregator if it's still active (it has an answering 1870 * partner) or if both the best and active don't have an 1871 * answering partner. 1872 */ 1873 if (active && active->lag_ports && 1874 __agg_active_ports(active) && 1875 (__agg_has_partner(active) || 1876 (!__agg_has_partner(active) && 1877 !__agg_has_partner(best)))) { 1878 if (!(!active->actor_oper_aggregator_key && 1879 best->actor_oper_aggregator_key)) { 1880 best = NULL; 1881 active->is_active = 1; 1882 } 1883 } 1884 } 1885 1886 if (best && (best == active)) { 1887 best = NULL; 1888 active->is_active = 1; 1889 } 1890 1891 /* if there is new best aggregator, activate it */ 1892 if (best) { 1893 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1894 best->slave ? best->slave->dev->name : "NULL", 1895 best->aggregator_identifier, best->num_of_ports, 1896 best->actor_oper_aggregator_key, 1897 best->partner_oper_aggregator_key, 1898 best->is_individual, best->is_active); 1899 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n", 1900 best->slave ? best->slave->dev->name : "NULL", 1901 best->lag_ports, best->slave); 1902 1903 bond_for_each_slave_rcu(bond, slave, iter) { 1904 agg = &(SLAVE_AD_INFO(slave)->aggregator); 1905 1906 slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1907 agg->aggregator_identifier, agg->num_of_ports, 1908 agg->actor_oper_aggregator_key, 1909 agg->partner_oper_aggregator_key, 1910 agg->is_individual, agg->is_active); 1911 } 1912 1913 /* check if any partner replies */ 1914 if (best->is_individual) 1915 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n", 1916 bond->dev->name); 1917 1918 best->is_active = 1; 1919 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n", 1920 best->slave ? best->slave->dev->name : "NULL", 1921 best->aggregator_identifier); 1922 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1923 best->slave ? best->slave->dev->name : "NULL", 1924 best->aggregator_identifier, best->num_of_ports, 1925 best->actor_oper_aggregator_key, 1926 best->partner_oper_aggregator_key, 1927 best->is_individual, best->is_active); 1928 1929 /* disable the ports that were related to the former 1930 * active_aggregator 1931 */ 1932 if (active) { 1933 for (port = active->lag_ports; port; 1934 port = port->next_port_in_aggregator) { 1935 __disable_port(port); 1936 } 1937 } 1938 /* Slave array needs update. */ 1939 *update_slave_arr = true; 1940 } 1941 1942 /* if the selected aggregator is of join individuals 1943 * (partner_system is NULL), enable their ports 1944 */ 1945 active = __get_active_agg(origin); 1946 1947 if (active) { 1948 if (!__agg_has_partner(active)) { 1949 for (port = active->lag_ports; port; 1950 port = port->next_port_in_aggregator) { 1951 __enable_port(port); 1952 } 1953 *update_slave_arr = true; 1954 } 1955 } 1956 1957 rcu_read_unlock(); 1958 1959 bond_3ad_set_carrier(bond); 1960 } 1961 1962 /** 1963 * ad_clear_agg - clear a given aggregator's parameters 1964 * @aggregator: the aggregator we're looking at 1965 */ 1966 static void ad_clear_agg(struct aggregator *aggregator) 1967 { 1968 if (aggregator) { 1969 aggregator->is_individual = false; 1970 aggregator->actor_admin_aggregator_key = 0; 1971 aggregator->actor_oper_aggregator_key = 0; 1972 eth_zero_addr(aggregator->partner_system.mac_addr_value); 1973 aggregator->partner_system_priority = 0; 1974 aggregator->partner_oper_aggregator_key = 0; 1975 aggregator->receive_state = 0; 1976 aggregator->transmit_state = 0; 1977 aggregator->lag_ports = NULL; 1978 aggregator->is_active = 0; 1979 aggregator->num_of_ports = 0; 1980 pr_debug("%s: LAG %d was cleared\n", 1981 aggregator->slave ? 1982 aggregator->slave->dev->name : "NULL", 1983 aggregator->aggregator_identifier); 1984 } 1985 } 1986 1987 /** 1988 * ad_initialize_agg - initialize a given aggregator's parameters 1989 * @aggregator: the aggregator we're looking at 1990 */ 1991 static void ad_initialize_agg(struct aggregator *aggregator) 1992 { 1993 if (aggregator) { 1994 ad_clear_agg(aggregator); 1995 1996 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value); 1997 aggregator->aggregator_identifier = 0; 1998 aggregator->slave = NULL; 1999 } 2000 } 2001 2002 /** 2003 * ad_initialize_port - initialize a given port's parameters 2004 * @port: the port we're looking at 2005 * @bond_params: bond parameters we will use 2006 */ 2007 static void ad_initialize_port(struct port *port, const struct bond_params *bond_params) 2008 { 2009 static const struct port_params tmpl = { 2010 .system_priority = 0xffff, 2011 .key = 1, 2012 .port_number = 1, 2013 .port_priority = 0xff, 2014 .port_state = 0, 2015 }; 2016 static const struct lacpdu lacpdu = { 2017 .subtype = 0x01, 2018 .version_number = 0x01, 2019 .tlv_type_actor_info = 0x01, 2020 .actor_information_length = 0x14, 2021 .tlv_type_partner_info = 0x02, 2022 .partner_information_length = 0x14, 2023 .tlv_type_collector_info = 0x03, 2024 .collector_information_length = 0x10, 2025 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY), 2026 }; 2027 2028 if (port) { 2029 port->actor_port_priority = 0xff; 2030 port->actor_port_aggregator_identifier = 0; 2031 port->ntt = false; 2032 port->actor_admin_port_state = LACP_STATE_AGGREGATION; 2033 port->actor_oper_port_state = LACP_STATE_AGGREGATION; 2034 if (bond_params->lacp_active) { 2035 port->actor_admin_port_state |= LACP_STATE_LACP_ACTIVITY; 2036 port->actor_oper_port_state |= LACP_STATE_LACP_ACTIVITY; 2037 } 2038 2039 if (bond_params->lacp_fast) 2040 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT; 2041 2042 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl)); 2043 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl)); 2044 2045 port->is_enabled = true; 2046 /* private parameters */ 2047 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED; 2048 port->sm_rx_state = 0; 2049 port->sm_rx_timer_counter = 0; 2050 port->sm_periodic_state = 0; 2051 port->sm_periodic_timer_counter = 0; 2052 port->sm_mux_state = 0; 2053 port->sm_mux_timer_counter = 0; 2054 port->sm_tx_state = 0; 2055 port->aggregator = NULL; 2056 port->next_port_in_aggregator = NULL; 2057 port->transaction_id = 0; 2058 2059 port->sm_churn_actor_timer_counter = 0; 2060 port->sm_churn_actor_state = 0; 2061 port->churn_actor_count = 0; 2062 port->sm_churn_partner_timer_counter = 0; 2063 port->sm_churn_partner_state = 0; 2064 port->churn_partner_count = 0; 2065 2066 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu)); 2067 } 2068 } 2069 2070 /** 2071 * ad_enable_collecting - enable a port's receive 2072 * @port: the port we're looking at 2073 * 2074 * Enable @port if it's in an active aggregator 2075 */ 2076 static void ad_enable_collecting(struct port *port) 2077 { 2078 if (port->aggregator->is_active) { 2079 struct slave *slave = port->slave; 2080 2081 slave_dbg(slave->bond->dev, slave->dev, 2082 "Enabling collecting on port %d (LAG %d)\n", 2083 port->actor_port_number, 2084 port->aggregator->aggregator_identifier); 2085 __enable_collecting_port(port); 2086 } 2087 } 2088 2089 /** 2090 * ad_disable_distributing - disable a port's transmit 2091 * @port: the port we're looking at 2092 * @update_slave_arr: Does slave array need update? 2093 */ 2094 static void ad_disable_distributing(struct port *port, bool *update_slave_arr) 2095 { 2096 if (port->aggregator && __agg_has_partner(port->aggregator)) { 2097 slave_dbg(port->slave->bond->dev, port->slave->dev, 2098 "Disabling distributing on port %d (LAG %d)\n", 2099 port->actor_port_number, 2100 port->aggregator->aggregator_identifier); 2101 __disable_distributing_port(port); 2102 /* Slave array needs an update */ 2103 *update_slave_arr = true; 2104 } 2105 } 2106 2107 /** 2108 * ad_enable_collecting_distributing - enable a port's transmit/receive 2109 * @port: the port we're looking at 2110 * @update_slave_arr: Does slave array need update? 2111 * 2112 * Enable @port if it's in an active aggregator 2113 */ 2114 static void ad_enable_collecting_distributing(struct port *port, 2115 bool *update_slave_arr) 2116 { 2117 if (port->aggregator->is_active) { 2118 slave_dbg(port->slave->bond->dev, port->slave->dev, 2119 "Enabling port %d (LAG %d)\n", 2120 port->actor_port_number, 2121 port->aggregator->aggregator_identifier); 2122 __enable_port(port); 2123 /* Slave array needs update */ 2124 *update_slave_arr = true; 2125 /* Should notify peers if possible */ 2126 ad_cond_set_peer_notif(port); 2127 } 2128 } 2129 2130 /** 2131 * ad_disable_collecting_distributing - disable a port's transmit/receive 2132 * @port: the port we're looking at 2133 * @update_slave_arr: Does slave array need update? 2134 */ 2135 static void ad_disable_collecting_distributing(struct port *port, 2136 bool *update_slave_arr) 2137 { 2138 if (port->aggregator && __agg_has_partner(port->aggregator)) { 2139 slave_dbg(port->slave->bond->dev, port->slave->dev, 2140 "Disabling port %d (LAG %d)\n", 2141 port->actor_port_number, 2142 port->aggregator->aggregator_identifier); 2143 __disable_port(port); 2144 /* Slave array needs an update */ 2145 *update_slave_arr = true; 2146 } 2147 } 2148 2149 /** 2150 * ad_marker_info_received - handle receive of a Marker information frame 2151 * @marker_info: Marker info received 2152 * @port: the port we're looking at 2153 */ 2154 static void ad_marker_info_received(struct bond_marker *marker_info, 2155 struct port *port) 2156 { 2157 struct bond_marker marker; 2158 2159 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx); 2160 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx); 2161 2162 /* copy the received marker data to the response marker */ 2163 memcpy(&marker, marker_info, sizeof(struct bond_marker)); 2164 /* change the marker subtype to marker response */ 2165 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE; 2166 2167 /* send the marker response */ 2168 if (ad_marker_send(port, &marker) >= 0) 2169 slave_dbg(port->slave->bond->dev, port->slave->dev, 2170 "Sent Marker Response on port %d\n", 2171 port->actor_port_number); 2172 } 2173 2174 /** 2175 * ad_marker_response_received - handle receive of a marker response frame 2176 * @marker: marker PDU received 2177 * @port: the port we're looking at 2178 * 2179 * This function does nothing since we decided not to implement send and handle 2180 * response for marker PDU's, in this stage, but only to respond to marker 2181 * information. 2182 */ 2183 static void ad_marker_response_received(struct bond_marker *marker, 2184 struct port *port) 2185 { 2186 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx); 2187 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx); 2188 2189 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */ 2190 } 2191 2192 /* ========= AD exported functions to the main bonding code ========= */ 2193 2194 /* Check aggregators status in team every T seconds */ 2195 #define AD_AGGREGATOR_SELECTION_TIMER 8 2196 2197 /** 2198 * bond_3ad_initiate_agg_selection - initate aggregator selection 2199 * @bond: bonding struct 2200 * @timeout: timeout value to set 2201 * 2202 * Set the aggregation selection timer, to initiate an agg selection in 2203 * the very near future. Called during first initialization, and during 2204 * any down to up transitions of the bond. 2205 */ 2206 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout) 2207 { 2208 atomic_set(&BOND_AD_INFO(bond).agg_select_timer, timeout); 2209 } 2210 2211 /** 2212 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures 2213 * @bond: bonding struct to work on 2214 * 2215 * Can be called only after the mac address of the bond is set. 2216 */ 2217 void bond_3ad_initialize(struct bonding *bond) 2218 { 2219 BOND_AD_INFO(bond).aggregator_identifier = 0; 2220 BOND_AD_INFO(bond).system.sys_priority = 2221 bond->params.ad_actor_sys_prio; 2222 if (is_zero_ether_addr(bond->params.ad_actor_system)) 2223 BOND_AD_INFO(bond).system.sys_mac_addr = 2224 *((struct mac_addr *)bond->dev->dev_addr); 2225 else 2226 BOND_AD_INFO(bond).system.sys_mac_addr = 2227 *((struct mac_addr *)bond->params.ad_actor_system); 2228 2229 bond_3ad_initiate_agg_selection(bond, 2230 AD_AGGREGATOR_SELECTION_TIMER * 2231 ad_ticks_per_sec); 2232 } 2233 2234 /** 2235 * bond_3ad_bind_slave - initialize a slave's port 2236 * @slave: slave struct to work on 2237 * 2238 * Returns: 0 on success 2239 * < 0 on error 2240 */ 2241 void bond_3ad_bind_slave(struct slave *slave) 2242 { 2243 struct bonding *bond = bond_get_bond_by_slave(slave); 2244 struct port *port; 2245 struct aggregator *aggregator; 2246 2247 /* check that the slave has not been initialized yet. */ 2248 if (SLAVE_AD_INFO(slave)->port.slave != slave) { 2249 2250 /* port initialization */ 2251 port = &(SLAVE_AD_INFO(slave)->port); 2252 2253 ad_initialize_port(port, &bond->params); 2254 2255 /* Port priority is initialized. Update it to slave's ad info */ 2256 SLAVE_AD_INFO(slave)->port_priority = port->actor_port_priority; 2257 2258 port->slave = slave; 2259 port->actor_port_number = SLAVE_AD_INFO(slave)->id; 2260 /* key is determined according to the link speed, duplex and 2261 * user key 2262 */ 2263 port->actor_admin_port_key = bond->params.ad_user_port_key << 6; 2264 ad_update_actor_keys(port, false); 2265 /* actor system is the bond's system */ 2266 __ad_actor_update_port(port); 2267 /* tx timer(to verify that no more than MAX_TX_IN_SECOND 2268 * lacpdu's are sent in one second) 2269 */ 2270 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND; 2271 2272 __disable_port(port); 2273 2274 /* aggregator initialization */ 2275 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 2276 2277 ad_initialize_agg(aggregator); 2278 2279 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr); 2280 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier; 2281 aggregator->slave = slave; 2282 aggregator->is_active = 0; 2283 aggregator->num_of_ports = 0; 2284 } 2285 } 2286 2287 /** 2288 * bond_3ad_unbind_slave - deinitialize a slave's port 2289 * @slave: slave struct to work on 2290 * 2291 * Search for the aggregator that is related to this port, remove the 2292 * aggregator and assign another aggregator for other port related to it 2293 * (if any), and remove the port. 2294 */ 2295 void bond_3ad_unbind_slave(struct slave *slave) 2296 { 2297 struct port *port, *prev_port, *temp_port; 2298 struct aggregator *aggregator, *new_aggregator, *temp_aggregator; 2299 int select_new_active_agg = 0; 2300 struct bonding *bond = slave->bond; 2301 struct slave *slave_iter; 2302 struct list_head *iter; 2303 bool dummy_slave_update; /* Ignore this value as caller updates array */ 2304 2305 /* Sync against bond_3ad_state_machine_handler() */ 2306 spin_lock_bh(&bond->mode_lock); 2307 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 2308 port = &(SLAVE_AD_INFO(slave)->port); 2309 2310 /* if slave is null, the whole port is not initialized */ 2311 if (!port->slave) { 2312 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n"); 2313 goto out; 2314 } 2315 2316 slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n", 2317 aggregator->aggregator_identifier); 2318 2319 /* Tell the partner that this port is not suitable for aggregation */ 2320 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION; 2321 port->actor_oper_port_state &= ~LACP_STATE_COLLECTING; 2322 port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING; 2323 port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION; 2324 __update_lacpdu_from_port(port); 2325 ad_lacpdu_send(port); 2326 2327 /* check if this aggregator is occupied */ 2328 if (aggregator->lag_ports) { 2329 /* check if there are other ports related to this aggregator 2330 * except the port related to this slave(thats ensure us that 2331 * there is a reason to search for new aggregator, and that we 2332 * will find one 2333 */ 2334 if ((aggregator->lag_ports != port) || 2335 (aggregator->lag_ports->next_port_in_aggregator)) { 2336 /* find new aggregator for the related port(s) */ 2337 bond_for_each_slave(bond, slave_iter, iter) { 2338 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); 2339 /* if the new aggregator is empty, or it is 2340 * connected to our port only 2341 */ 2342 if (!new_aggregator->lag_ports || 2343 ((new_aggregator->lag_ports == port) && 2344 !new_aggregator->lag_ports->next_port_in_aggregator)) 2345 break; 2346 } 2347 if (!slave_iter) 2348 new_aggregator = NULL; 2349 2350 /* if new aggregator found, copy the aggregator's 2351 * parameters and connect the related lag_ports to the 2352 * new aggregator 2353 */ 2354 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) { 2355 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n", 2356 aggregator->aggregator_identifier, 2357 new_aggregator->aggregator_identifier); 2358 2359 if ((new_aggregator->lag_ports == port) && 2360 new_aggregator->is_active) { 2361 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); 2362 select_new_active_agg = 1; 2363 } 2364 2365 new_aggregator->is_individual = aggregator->is_individual; 2366 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key; 2367 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key; 2368 new_aggregator->partner_system = aggregator->partner_system; 2369 new_aggregator->partner_system_priority = aggregator->partner_system_priority; 2370 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key; 2371 new_aggregator->receive_state = aggregator->receive_state; 2372 new_aggregator->transmit_state = aggregator->transmit_state; 2373 new_aggregator->lag_ports = aggregator->lag_ports; 2374 new_aggregator->is_active = aggregator->is_active; 2375 new_aggregator->num_of_ports = aggregator->num_of_ports; 2376 2377 /* update the information that is written on 2378 * the ports about the aggregator 2379 */ 2380 for (temp_port = aggregator->lag_ports; temp_port; 2381 temp_port = temp_port->next_port_in_aggregator) { 2382 temp_port->aggregator = new_aggregator; 2383 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier; 2384 } 2385 2386 ad_clear_agg(aggregator); 2387 2388 if (select_new_active_agg) 2389 ad_agg_selection_logic(__get_first_agg(port), 2390 &dummy_slave_update); 2391 } else { 2392 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n"); 2393 } 2394 } else { 2395 /* in case that the only port related to this 2396 * aggregator is the one we want to remove 2397 */ 2398 select_new_active_agg = aggregator->is_active; 2399 ad_clear_agg(aggregator); 2400 if (select_new_active_agg) { 2401 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); 2402 /* select new active aggregator */ 2403 temp_aggregator = __get_first_agg(port); 2404 if (temp_aggregator) 2405 ad_agg_selection_logic(temp_aggregator, 2406 &dummy_slave_update); 2407 } 2408 } 2409 } 2410 2411 slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number); 2412 2413 /* find the aggregator that this port is connected to */ 2414 bond_for_each_slave(bond, slave_iter, iter) { 2415 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); 2416 prev_port = NULL; 2417 /* search the port in the aggregator's related ports */ 2418 for (temp_port = temp_aggregator->lag_ports; temp_port; 2419 prev_port = temp_port, 2420 temp_port = temp_port->next_port_in_aggregator) { 2421 if (temp_port == port) { 2422 /* the aggregator found - detach the port from 2423 * this aggregator 2424 */ 2425 if (prev_port) 2426 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator; 2427 else 2428 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator; 2429 temp_aggregator->num_of_ports--; 2430 if (__agg_active_ports(temp_aggregator) == 0) { 2431 select_new_active_agg = temp_aggregator->is_active; 2432 if (temp_aggregator->num_of_ports == 0) 2433 ad_clear_agg(temp_aggregator); 2434 if (select_new_active_agg) { 2435 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n"); 2436 /* select new active aggregator */ 2437 ad_agg_selection_logic(__get_first_agg(port), 2438 &dummy_slave_update); 2439 } 2440 } 2441 break; 2442 } 2443 } 2444 } 2445 port->slave = NULL; 2446 2447 out: 2448 spin_unlock_bh(&bond->mode_lock); 2449 } 2450 2451 /** 2452 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports 2453 * @bond: bonding struct to work on 2454 * 2455 * If an ad_actor setting gets changed we need to update the individual port 2456 * settings so the bond device will use the new values when it gets upped. 2457 */ 2458 void bond_3ad_update_ad_actor_settings(struct bonding *bond) 2459 { 2460 struct list_head *iter; 2461 struct slave *slave; 2462 2463 ASSERT_RTNL(); 2464 2465 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio; 2466 if (is_zero_ether_addr(bond->params.ad_actor_system)) 2467 BOND_AD_INFO(bond).system.sys_mac_addr = 2468 *((struct mac_addr *)bond->dev->dev_addr); 2469 else 2470 BOND_AD_INFO(bond).system.sys_mac_addr = 2471 *((struct mac_addr *)bond->params.ad_actor_system); 2472 2473 spin_lock_bh(&bond->mode_lock); 2474 bond_for_each_slave(bond, slave, iter) { 2475 struct port *port = &(SLAVE_AD_INFO(slave))->port; 2476 2477 __ad_actor_update_port(port); 2478 port->ntt = true; 2479 } 2480 spin_unlock_bh(&bond->mode_lock); 2481 } 2482 2483 /** 2484 * bond_agg_timer_advance - advance agg_select_timer 2485 * @bond: bonding structure 2486 * 2487 * Return true when agg_select_timer reaches 0. 2488 */ 2489 static bool bond_agg_timer_advance(struct bonding *bond) 2490 { 2491 int val, nval; 2492 2493 while (1) { 2494 val = atomic_read(&BOND_AD_INFO(bond).agg_select_timer); 2495 if (!val) 2496 return false; 2497 nval = val - 1; 2498 if (atomic_cmpxchg(&BOND_AD_INFO(bond).agg_select_timer, 2499 val, nval) == val) 2500 break; 2501 } 2502 return nval == 0; 2503 } 2504 2505 /** 2506 * bond_3ad_state_machine_handler - handle state machines timeout 2507 * @work: work context to fetch bonding struct to work on from 2508 * 2509 * The state machine handling concept in this module is to check every tick 2510 * which state machine should operate any function. The execution order is 2511 * round robin, so when we have an interaction between state machines, the 2512 * reply of one to each other might be delayed until next tick. 2513 * 2514 * This function also complete the initialization when the agg_select_timer 2515 * times out, and it selects an aggregator for the ports that are yet not 2516 * related to any aggregator, and selects the active aggregator for a bond. 2517 */ 2518 void bond_3ad_state_machine_handler(struct work_struct *work) 2519 { 2520 struct bonding *bond = container_of(work, struct bonding, 2521 ad_work.work); 2522 struct aggregator *aggregator; 2523 struct list_head *iter; 2524 struct slave *slave; 2525 struct port *port; 2526 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2527 bool update_slave_arr = false; 2528 2529 /* Lock to protect data accessed by all (e.g., port->sm_vars) and 2530 * against running with bond_3ad_unbind_slave. ad_rx_machine may run 2531 * concurrently due to incoming LACPDU as well. 2532 */ 2533 spin_lock_bh(&bond->mode_lock); 2534 rcu_read_lock(); 2535 2536 /* check if there are any slaves */ 2537 if (!bond_has_slaves(bond)) 2538 goto re_arm; 2539 2540 if (bond_agg_timer_advance(bond)) { 2541 slave = bond_first_slave_rcu(bond); 2542 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL; 2543 2544 /* select the active aggregator for the bond */ 2545 if (port) { 2546 if (!port->slave) { 2547 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n", 2548 bond->dev->name); 2549 goto re_arm; 2550 } 2551 2552 aggregator = __get_first_agg(port); 2553 ad_agg_selection_logic(aggregator, &update_slave_arr); 2554 } 2555 bond_3ad_set_carrier(bond); 2556 } 2557 2558 /* for each port run the state machines */ 2559 bond_for_each_slave_rcu(bond, slave, iter) { 2560 port = &(SLAVE_AD_INFO(slave)->port); 2561 if (!port->slave) { 2562 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n", 2563 bond->dev->name); 2564 goto re_arm; 2565 } 2566 2567 ad_rx_machine(NULL, port); 2568 ad_periodic_machine(port); 2569 ad_port_selection_logic(port, &update_slave_arr); 2570 ad_mux_machine(port, &update_slave_arr); 2571 ad_tx_machine(port); 2572 ad_churn_machine(port); 2573 2574 /* turn off the BEGIN bit, since we already handled it */ 2575 if (port->sm_vars & AD_PORT_BEGIN) 2576 port->sm_vars &= ~AD_PORT_BEGIN; 2577 } 2578 2579 re_arm: 2580 bond_for_each_slave_rcu(bond, slave, iter) { 2581 if (slave->should_notify) { 2582 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2583 break; 2584 } 2585 } 2586 rcu_read_unlock(); 2587 spin_unlock_bh(&bond->mode_lock); 2588 2589 if (update_slave_arr) 2590 bond_slave_arr_work_rearm(bond, 0); 2591 2592 if (should_notify_rtnl && rtnl_trylock()) { 2593 bond_slave_state_notify(bond); 2594 rtnl_unlock(); 2595 } 2596 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); 2597 } 2598 2599 /** 2600 * bond_3ad_rx_indication - handle a received frame 2601 * @lacpdu: received lacpdu 2602 * @slave: slave struct to work on 2603 * 2604 * It is assumed that frames that were sent on this NIC don't returned as new 2605 * received frames (loopback). Since only the payload is given to this 2606 * function, it check for loopback. 2607 */ 2608 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave) 2609 { 2610 struct bonding *bond = slave->bond; 2611 int ret = RX_HANDLER_ANOTHER; 2612 struct bond_marker *marker; 2613 struct port *port; 2614 atomic64_t *stat; 2615 2616 port = &(SLAVE_AD_INFO(slave)->port); 2617 if (!port->slave) { 2618 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n", 2619 slave->dev->name, slave->bond->dev->name); 2620 return ret; 2621 } 2622 2623 switch (lacpdu->subtype) { 2624 case AD_TYPE_LACPDU: 2625 ret = RX_HANDLER_CONSUMED; 2626 slave_dbg(slave->bond->dev, slave->dev, 2627 "Received LACPDU on port %d\n", 2628 port->actor_port_number); 2629 /* Protect against concurrent state machines */ 2630 spin_lock(&slave->bond->mode_lock); 2631 ad_rx_machine(lacpdu, port); 2632 spin_unlock(&slave->bond->mode_lock); 2633 break; 2634 case AD_TYPE_MARKER: 2635 ret = RX_HANDLER_CONSUMED; 2636 /* No need to convert fields to Little Endian since we 2637 * don't use the marker's fields. 2638 */ 2639 marker = (struct bond_marker *)lacpdu; 2640 switch (marker->tlv_type) { 2641 case AD_MARKER_INFORMATION_SUBTYPE: 2642 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n", 2643 port->actor_port_number); 2644 ad_marker_info_received(marker, port); 2645 break; 2646 case AD_MARKER_RESPONSE_SUBTYPE: 2647 slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n", 2648 port->actor_port_number); 2649 ad_marker_response_received(marker, port); 2650 break; 2651 default: 2652 slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n", 2653 port->actor_port_number); 2654 stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx; 2655 atomic64_inc(stat); 2656 stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx; 2657 atomic64_inc(stat); 2658 } 2659 break; 2660 default: 2661 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx); 2662 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx); 2663 } 2664 2665 return ret; 2666 } 2667 2668 /** 2669 * ad_update_actor_keys - Update the oper / admin keys for a port based on 2670 * its current speed and duplex settings. 2671 * 2672 * @port: the port we'are looking at 2673 * @reset: Boolean to just reset the speed and the duplex part of the key 2674 * 2675 * The logic to change the oper / admin keys is: 2676 * (a) A full duplex port can participate in LACP with partner. 2677 * (b) When the speed is changed, LACP need to be reinitiated. 2678 */ 2679 static void ad_update_actor_keys(struct port *port, bool reset) 2680 { 2681 u8 duplex = 0; 2682 u16 ospeed = 0, speed = 0; 2683 u16 old_oper_key = port->actor_oper_port_key; 2684 2685 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS); 2686 if (!reset) { 2687 speed = __get_link_speed(port); 2688 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1; 2689 duplex = __get_duplex(port); 2690 port->actor_admin_port_key |= (speed << 1) | duplex; 2691 } 2692 port->actor_oper_port_key = port->actor_admin_port_key; 2693 2694 if (old_oper_key != port->actor_oper_port_key) { 2695 /* Only 'duplex' port participates in LACP */ 2696 if (duplex) 2697 port->sm_vars |= AD_PORT_LACP_ENABLED; 2698 else 2699 port->sm_vars &= ~AD_PORT_LACP_ENABLED; 2700 2701 if (!reset) { 2702 if (!speed) { 2703 slave_err(port->slave->bond->dev, 2704 port->slave->dev, 2705 "speed changed to 0 on port %d\n", 2706 port->actor_port_number); 2707 } else if (duplex && ospeed != speed) { 2708 /* Speed change restarts LACP state-machine */ 2709 port->sm_vars |= AD_PORT_BEGIN; 2710 } 2711 } 2712 } 2713 } 2714 2715 /** 2716 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex 2717 * change indication 2718 * 2719 * @slave: slave struct to work on 2720 * 2721 * Handle reselection of aggregator (if needed) for this port. 2722 */ 2723 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave) 2724 { 2725 struct port *port; 2726 2727 port = &(SLAVE_AD_INFO(slave)->port); 2728 2729 /* if slave is null, the whole port is not initialized */ 2730 if (!port->slave) { 2731 slave_warn(slave->bond->dev, slave->dev, 2732 "speed/duplex changed for uninitialized port\n"); 2733 return; 2734 } 2735 2736 spin_lock_bh(&slave->bond->mode_lock); 2737 ad_update_actor_keys(port, false); 2738 spin_unlock_bh(&slave->bond->mode_lock); 2739 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n", 2740 port->actor_port_number); 2741 } 2742 2743 /** 2744 * bond_3ad_handle_link_change - handle a slave's link status change indication 2745 * @slave: slave struct to work on 2746 * @link: whether the link is now up or down 2747 * 2748 * Handle reselection of aggregator (if needed) for this port. 2749 */ 2750 void bond_3ad_handle_link_change(struct slave *slave, char link) 2751 { 2752 struct aggregator *agg; 2753 struct port *port; 2754 bool dummy; 2755 2756 port = &(SLAVE_AD_INFO(slave)->port); 2757 2758 /* if slave is null, the whole port is not initialized */ 2759 if (!port->slave) { 2760 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n"); 2761 return; 2762 } 2763 2764 spin_lock_bh(&slave->bond->mode_lock); 2765 /* on link down we are zeroing duplex and speed since 2766 * some of the adaptors(ce1000.lan) report full duplex/speed 2767 * instead of N/A(duplex) / 0(speed). 2768 * 2769 * on link up we are forcing recheck on the duplex and speed since 2770 * some of he adaptors(ce1000.lan) report. 2771 */ 2772 if (link == BOND_LINK_UP) { 2773 port->is_enabled = true; 2774 ad_update_actor_keys(port, false); 2775 } else { 2776 /* link has failed */ 2777 port->is_enabled = false; 2778 ad_update_actor_keys(port, true); 2779 } 2780 agg = __get_first_agg(port); 2781 ad_agg_selection_logic(agg, &dummy); 2782 2783 spin_unlock_bh(&slave->bond->mode_lock); 2784 2785 slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n", 2786 port->actor_port_number, 2787 link == BOND_LINK_UP ? "UP" : "DOWN"); 2788 2789 /* RTNL is held and mode_lock is released so it's safe 2790 * to update slave_array here. 2791 */ 2792 bond_update_slave_arr(slave->bond, NULL); 2793 } 2794 2795 /** 2796 * bond_3ad_set_carrier - set link state for bonding master 2797 * @bond: bonding structure 2798 * 2799 * if we have an active aggregator, we're up, if not, we're down. 2800 * Presumes that we cannot have an active aggregator if there are 2801 * no slaves with link up. 2802 * 2803 * This behavior complies with IEEE 802.3 section 43.3.9. 2804 * 2805 * Called by bond_set_carrier(). Return zero if carrier state does not 2806 * change, nonzero if it does. 2807 */ 2808 int bond_3ad_set_carrier(struct bonding *bond) 2809 { 2810 struct aggregator *active; 2811 struct slave *first_slave; 2812 int ret = 1; 2813 2814 rcu_read_lock(); 2815 first_slave = bond_first_slave_rcu(bond); 2816 if (!first_slave) { 2817 ret = 0; 2818 goto out; 2819 } 2820 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator)); 2821 if (active) { 2822 /* are enough slaves available to consider link up? */ 2823 if (__agg_active_ports(active) < bond->params.min_links) { 2824 if (netif_carrier_ok(bond->dev)) { 2825 netif_carrier_off(bond->dev); 2826 goto out; 2827 } 2828 } else if (!netif_carrier_ok(bond->dev)) { 2829 netif_carrier_on(bond->dev); 2830 goto out; 2831 } 2832 } else if (netif_carrier_ok(bond->dev)) { 2833 netif_carrier_off(bond->dev); 2834 } 2835 out: 2836 rcu_read_unlock(); 2837 return ret; 2838 } 2839 2840 /** 2841 * __bond_3ad_get_active_agg_info - get information of the active aggregator 2842 * @bond: bonding struct to work on 2843 * @ad_info: ad_info struct to fill with the bond's info 2844 * 2845 * Returns: 0 on success 2846 * < 0 on error 2847 */ 2848 int __bond_3ad_get_active_agg_info(struct bonding *bond, 2849 struct ad_info *ad_info) 2850 { 2851 struct aggregator *aggregator = NULL; 2852 struct list_head *iter; 2853 struct slave *slave; 2854 struct port *port; 2855 2856 bond_for_each_slave_rcu(bond, slave, iter) { 2857 port = &(SLAVE_AD_INFO(slave)->port); 2858 if (port->aggregator && port->aggregator->is_active) { 2859 aggregator = port->aggregator; 2860 break; 2861 } 2862 } 2863 2864 if (!aggregator) 2865 return -1; 2866 2867 ad_info->aggregator_id = aggregator->aggregator_identifier; 2868 ad_info->ports = __agg_active_ports(aggregator); 2869 ad_info->actor_key = aggregator->actor_oper_aggregator_key; 2870 ad_info->partner_key = aggregator->partner_oper_aggregator_key; 2871 ether_addr_copy(ad_info->partner_system, 2872 aggregator->partner_system.mac_addr_value); 2873 return 0; 2874 } 2875 2876 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info) 2877 { 2878 int ret; 2879 2880 rcu_read_lock(); 2881 ret = __bond_3ad_get_active_agg_info(bond, ad_info); 2882 rcu_read_unlock(); 2883 2884 return ret; 2885 } 2886 2887 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond, 2888 struct slave *slave) 2889 { 2890 struct lacpdu *lacpdu, _lacpdu; 2891 2892 if (skb->protocol != PKT_TYPE_LACPDU) 2893 return RX_HANDLER_ANOTHER; 2894 2895 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr)) 2896 return RX_HANDLER_ANOTHER; 2897 2898 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu); 2899 if (!lacpdu) { 2900 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx); 2901 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx); 2902 return RX_HANDLER_ANOTHER; 2903 } 2904 2905 return bond_3ad_rx_indication(lacpdu, slave); 2906 } 2907 2908 /** 2909 * bond_3ad_update_lacp_rate - change the lacp rate 2910 * @bond: bonding struct 2911 * 2912 * When modify lacp_rate parameter via sysfs, 2913 * update actor_oper_port_state of each port. 2914 * 2915 * Hold bond->mode_lock, 2916 * so we can modify port->actor_oper_port_state, 2917 * no matter bond is up or down. 2918 */ 2919 void bond_3ad_update_lacp_rate(struct bonding *bond) 2920 { 2921 struct port *port = NULL; 2922 struct list_head *iter; 2923 struct slave *slave; 2924 int lacp_fast; 2925 2926 lacp_fast = bond->params.lacp_fast; 2927 spin_lock_bh(&bond->mode_lock); 2928 bond_for_each_slave(bond, slave, iter) { 2929 port = &(SLAVE_AD_INFO(slave)->port); 2930 if (lacp_fast) 2931 port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT; 2932 else 2933 port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT; 2934 } 2935 spin_unlock_bh(&bond->mode_lock); 2936 } 2937 2938 /** 2939 * bond_3ad_update_lacp_active - change the lacp active 2940 * @bond: bonding struct 2941 * 2942 * Update actor_oper_port_state when lacp_active is modified. 2943 */ 2944 void bond_3ad_update_lacp_active(struct bonding *bond) 2945 { 2946 struct port *port = NULL; 2947 struct list_head *iter; 2948 struct slave *slave; 2949 int lacp_active; 2950 2951 lacp_active = bond->params.lacp_active; 2952 spin_lock_bh(&bond->mode_lock); 2953 bond_for_each_slave(bond, slave, iter) { 2954 port = &(SLAVE_AD_INFO(slave)->port); 2955 if (lacp_active) 2956 port->actor_oper_port_state |= LACP_STATE_LACP_ACTIVITY; 2957 else 2958 port->actor_oper_port_state &= ~LACP_STATE_LACP_ACTIVITY; 2959 } 2960 spin_unlock_bh(&bond->mode_lock); 2961 } 2962 2963 size_t bond_3ad_stats_size(void) 2964 { 2965 return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */ 2966 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */ 2967 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */ 2968 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */ 2969 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */ 2970 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */ 2971 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */ 2972 nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */ 2973 nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */ 2974 } 2975 2976 int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats) 2977 { 2978 u64 val; 2979 2980 val = atomic64_read(&stats->lacpdu_rx); 2981 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val, 2982 BOND_3AD_STAT_PAD)) 2983 return -EMSGSIZE; 2984 val = atomic64_read(&stats->lacpdu_tx); 2985 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val, 2986 BOND_3AD_STAT_PAD)) 2987 return -EMSGSIZE; 2988 val = atomic64_read(&stats->lacpdu_unknown_rx); 2989 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val, 2990 BOND_3AD_STAT_PAD)) 2991 return -EMSGSIZE; 2992 val = atomic64_read(&stats->lacpdu_illegal_rx); 2993 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val, 2994 BOND_3AD_STAT_PAD)) 2995 return -EMSGSIZE; 2996 2997 val = atomic64_read(&stats->marker_rx); 2998 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val, 2999 BOND_3AD_STAT_PAD)) 3000 return -EMSGSIZE; 3001 val = atomic64_read(&stats->marker_tx); 3002 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val, 3003 BOND_3AD_STAT_PAD)) 3004 return -EMSGSIZE; 3005 val = atomic64_read(&stats->marker_resp_rx); 3006 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val, 3007 BOND_3AD_STAT_PAD)) 3008 return -EMSGSIZE; 3009 val = atomic64_read(&stats->marker_resp_tx); 3010 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val, 3011 BOND_3AD_STAT_PAD)) 3012 return -EMSGSIZE; 3013 val = atomic64_read(&stats->marker_unknown_rx); 3014 if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val, 3015 BOND_3AD_STAT_PAD)) 3016 return -EMSGSIZE; 3017 3018 return 0; 3019 } 3020