1 /* 2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the Free 6 * Software Foundation; either version 2 of the License, or (at your option) 7 * any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program; if not, write to the Free Software Foundation, Inc., 59 16 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17 * 18 * The full GNU General Public License is included in this distribution in the 19 * file called LICENSE. 20 * 21 */ 22 23 #include <linux/skbuff.h> 24 #include <linux/if_ether.h> 25 #include <linux/netdevice.h> 26 #include <linux/spinlock.h> 27 #include <linux/ethtool.h> 28 #include <linux/etherdevice.h> 29 #include <linux/if_bonding.h> 30 #include <linux/pkt_sched.h> 31 #include <net/net_namespace.h> 32 #include <net/bonding.h> 33 #include <net/bond_3ad.h> 34 35 /* General definitions */ 36 #define AD_SHORT_TIMEOUT 1 37 #define AD_LONG_TIMEOUT 0 38 #define AD_STANDBY 0x2 39 #define AD_MAX_TX_IN_SECOND 3 40 #define AD_COLLECTOR_MAX_DELAY 0 41 42 /* Timer definitions (43.4.4 in the 802.3ad standard) */ 43 #define AD_FAST_PERIODIC_TIME 1 44 #define AD_SLOW_PERIODIC_TIME 30 45 #define AD_SHORT_TIMEOUT_TIME (3*AD_FAST_PERIODIC_TIME) 46 #define AD_LONG_TIMEOUT_TIME (3*AD_SLOW_PERIODIC_TIME) 47 #define AD_CHURN_DETECTION_TIME 60 48 #define AD_AGGREGATE_WAIT_TIME 2 49 50 /* Port state definitions (43.4.2.2 in the 802.3ad standard) */ 51 #define AD_STATE_LACP_ACTIVITY 0x1 52 #define AD_STATE_LACP_TIMEOUT 0x2 53 #define AD_STATE_AGGREGATION 0x4 54 #define AD_STATE_SYNCHRONIZATION 0x8 55 #define AD_STATE_COLLECTING 0x10 56 #define AD_STATE_DISTRIBUTING 0x20 57 #define AD_STATE_DEFAULTED 0x40 58 #define AD_STATE_EXPIRED 0x80 59 60 /* Port Variables definitions used by the State Machines (43.4.7 in the 61 * 802.3ad standard) 62 */ 63 #define AD_PORT_BEGIN 0x1 64 #define AD_PORT_LACP_ENABLED 0x2 65 #define AD_PORT_ACTOR_CHURN 0x4 66 #define AD_PORT_PARTNER_CHURN 0x8 67 #define AD_PORT_READY 0x10 68 #define AD_PORT_READY_N 0x20 69 #define AD_PORT_MATCHED 0x40 70 #define AD_PORT_STANDBY 0x80 71 #define AD_PORT_SELECTED 0x100 72 #define AD_PORT_MOVED 0x200 73 #define AD_PORT_CHURNED (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN) 74 75 /* Port Key definitions 76 * key is determined according to the link speed, duplex and 77 * user key (which is yet not supported) 78 * -------------------------------------------------------------- 79 * Port key | User key (10 bits) | Speed (5 bits) | Duplex| 80 * -------------------------------------------------------------- 81 * |15 6|5 1|0 82 */ 83 #define AD_DUPLEX_KEY_MASKS 0x1 84 #define AD_SPEED_KEY_MASKS 0x3E 85 #define AD_USER_KEY_MASKS 0xFFC0 86 87 enum ad_link_speed_type { 88 AD_LINK_SPEED_1MBPS = 1, 89 AD_LINK_SPEED_10MBPS, 90 AD_LINK_SPEED_100MBPS, 91 AD_LINK_SPEED_1000MBPS, 92 AD_LINK_SPEED_2500MBPS, 93 AD_LINK_SPEED_10000MBPS, 94 AD_LINK_SPEED_20000MBPS, 95 AD_LINK_SPEED_40000MBPS, 96 AD_LINK_SPEED_56000MBPS, 97 AD_LINK_SPEED_100000MBPS, 98 }; 99 100 /* compare MAC addresses */ 101 #define MAC_ADDRESS_EQUAL(A, B) \ 102 ether_addr_equal_64bits((const u8 *)A, (const u8 *)B) 103 104 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } }; 105 static u16 ad_ticks_per_sec; 106 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000; 107 108 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR; 109 110 /* ================= main 802.3ad protocol functions ================== */ 111 static int ad_lacpdu_send(struct port *port); 112 static int ad_marker_send(struct port *port, struct bond_marker *marker); 113 static void ad_mux_machine(struct port *port, bool *update_slave_arr); 114 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port); 115 static void ad_tx_machine(struct port *port); 116 static void ad_periodic_machine(struct port *port); 117 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr); 118 static void ad_agg_selection_logic(struct aggregator *aggregator, 119 bool *update_slave_arr); 120 static void ad_clear_agg(struct aggregator *aggregator); 121 static void ad_initialize_agg(struct aggregator *aggregator); 122 static void ad_initialize_port(struct port *port, int lacp_fast); 123 static void ad_enable_collecting_distributing(struct port *port, 124 bool *update_slave_arr); 125 static void ad_disable_collecting_distributing(struct port *port, 126 bool *update_slave_arr); 127 static void ad_marker_info_received(struct bond_marker *marker_info, 128 struct port *port); 129 static void ad_marker_response_received(struct bond_marker *marker, 130 struct port *port); 131 static void ad_update_actor_keys(struct port *port, bool reset); 132 133 134 /* ================= api to bonding and kernel code ================== */ 135 136 /** 137 * __get_bond_by_port - get the port's bonding struct 138 * @port: the port we're looking at 139 * 140 * Return @port's bonding struct, or %NULL if it can't be found. 141 */ 142 static inline struct bonding *__get_bond_by_port(struct port *port) 143 { 144 if (port->slave == NULL) 145 return NULL; 146 147 return bond_get_bond_by_slave(port->slave); 148 } 149 150 /** 151 * __get_first_agg - get the first aggregator in the bond 152 * @bond: the bond we're looking at 153 * 154 * Return the aggregator of the first slave in @bond, or %NULL if it can't be 155 * found. 156 * The caller must hold RCU or RTNL lock. 157 */ 158 static inline struct aggregator *__get_first_agg(struct port *port) 159 { 160 struct bonding *bond = __get_bond_by_port(port); 161 struct slave *first_slave; 162 struct aggregator *agg; 163 164 /* If there's no bond for this port, or bond has no slaves */ 165 if (bond == NULL) 166 return NULL; 167 168 rcu_read_lock(); 169 first_slave = bond_first_slave_rcu(bond); 170 agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL; 171 rcu_read_unlock(); 172 173 return agg; 174 } 175 176 /** 177 * __agg_has_partner - see if we have a partner 178 * @agg: the agregator we're looking at 179 * 180 * Return nonzero if aggregator has a partner (denoted by a non-zero ether 181 * address for the partner). Return 0 if not. 182 */ 183 static inline int __agg_has_partner(struct aggregator *agg) 184 { 185 return !is_zero_ether_addr(agg->partner_system.mac_addr_value); 186 } 187 188 /** 189 * __disable_port - disable the port's slave 190 * @port: the port we're looking at 191 */ 192 static inline void __disable_port(struct port *port) 193 { 194 bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER); 195 } 196 197 /** 198 * __enable_port - enable the port's slave, if it's up 199 * @port: the port we're looking at 200 */ 201 static inline void __enable_port(struct port *port) 202 { 203 struct slave *slave = port->slave; 204 205 if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave)) 206 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER); 207 } 208 209 /** 210 * __port_is_enabled - check if the port's slave is in active state 211 * @port: the port we're looking at 212 */ 213 static inline int __port_is_enabled(struct port *port) 214 { 215 return bond_is_active_slave(port->slave); 216 } 217 218 /** 219 * __get_agg_selection_mode - get the aggregator selection mode 220 * @port: the port we're looking at 221 * 222 * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT. 223 */ 224 static inline u32 __get_agg_selection_mode(struct port *port) 225 { 226 struct bonding *bond = __get_bond_by_port(port); 227 228 if (bond == NULL) 229 return BOND_AD_STABLE; 230 231 return bond->params.ad_select; 232 } 233 234 /** 235 * __check_agg_selection_timer - check if the selection timer has expired 236 * @port: the port we're looking at 237 */ 238 static inline int __check_agg_selection_timer(struct port *port) 239 { 240 struct bonding *bond = __get_bond_by_port(port); 241 242 if (bond == NULL) 243 return 0; 244 245 return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0; 246 } 247 248 /** 249 * __get_link_speed - get a port's speed 250 * @port: the port we're looking at 251 * 252 * Return @port's speed in 802.3ad enum format. i.e. one of: 253 * 0, 254 * %AD_LINK_SPEED_10MBPS, 255 * %AD_LINK_SPEED_100MBPS, 256 * %AD_LINK_SPEED_1000MBPS, 257 * %AD_LINK_SPEED_2500MBPS, 258 * %AD_LINK_SPEED_10000MBPS 259 * %AD_LINK_SPEED_20000MBPS 260 * %AD_LINK_SPEED_40000MBPS 261 * %AD_LINK_SPEED_56000MBPS 262 * %AD_LINK_SPEED_100000MBPS 263 */ 264 static u16 __get_link_speed(struct port *port) 265 { 266 struct slave *slave = port->slave; 267 u16 speed; 268 269 /* this if covers only a special case: when the configuration starts 270 * with link down, it sets the speed to 0. 271 * This is done in spite of the fact that the e100 driver reports 0 272 * to be compatible with MVT in the future. 273 */ 274 if (slave->link != BOND_LINK_UP) 275 speed = 0; 276 else { 277 switch (slave->speed) { 278 case SPEED_10: 279 speed = AD_LINK_SPEED_10MBPS; 280 break; 281 282 case SPEED_100: 283 speed = AD_LINK_SPEED_100MBPS; 284 break; 285 286 case SPEED_1000: 287 speed = AD_LINK_SPEED_1000MBPS; 288 break; 289 290 case SPEED_2500: 291 speed = AD_LINK_SPEED_2500MBPS; 292 break; 293 294 case SPEED_10000: 295 speed = AD_LINK_SPEED_10000MBPS; 296 break; 297 298 case SPEED_20000: 299 speed = AD_LINK_SPEED_20000MBPS; 300 break; 301 302 case SPEED_40000: 303 speed = AD_LINK_SPEED_40000MBPS; 304 break; 305 306 case SPEED_56000: 307 speed = AD_LINK_SPEED_56000MBPS; 308 break; 309 310 case SPEED_100000: 311 speed = AD_LINK_SPEED_100000MBPS; 312 break; 313 314 default: 315 /* unknown speed value from ethtool. shouldn't happen */ 316 speed = 0; 317 break; 318 } 319 } 320 321 netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n", 322 port->actor_port_number, speed); 323 return speed; 324 } 325 326 /** 327 * __get_duplex - get a port's duplex 328 * @port: the port we're looking at 329 * 330 * Return @port's duplex in 802.3ad bitmask format. i.e.: 331 * 0x01 if in full duplex 332 * 0x00 otherwise 333 */ 334 static u8 __get_duplex(struct port *port) 335 { 336 struct slave *slave = port->slave; 337 u8 retval = 0x0; 338 339 /* handling a special case: when the configuration starts with 340 * link down, it sets the duplex to 0. 341 */ 342 if (slave->link == BOND_LINK_UP) { 343 switch (slave->duplex) { 344 case DUPLEX_FULL: 345 retval = 0x1; 346 netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n", 347 port->actor_port_number); 348 break; 349 case DUPLEX_HALF: 350 default: 351 retval = 0x0; 352 netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n", 353 port->actor_port_number); 354 break; 355 } 356 } 357 return retval; 358 } 359 360 static void __ad_actor_update_port(struct port *port) 361 { 362 const struct bonding *bond = bond_get_bond_by_slave(port->slave); 363 364 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr; 365 port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority; 366 } 367 368 /* Conversions */ 369 370 /** 371 * __ad_timer_to_ticks - convert a given timer type to AD module ticks 372 * @timer_type: which timer to operate 373 * @par: timer parameter. see below 374 * 375 * If @timer_type is %current_while_timer, @par indicates long/short timer. 376 * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME, 377 * %SLOW_PERIODIC_TIME. 378 */ 379 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par) 380 { 381 u16 retval = 0; /* to silence the compiler */ 382 383 switch (timer_type) { 384 case AD_CURRENT_WHILE_TIMER: /* for rx machine usage */ 385 if (par) 386 retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); 387 else 388 retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); 389 break; 390 case AD_ACTOR_CHURN_TIMER: /* for local churn machine */ 391 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); 392 break; 393 case AD_PERIODIC_TIMER: /* for periodic machine */ 394 retval = (par*ad_ticks_per_sec); /* long timeout */ 395 break; 396 case AD_PARTNER_CHURN_TIMER: /* for remote churn machine */ 397 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec); 398 break; 399 case AD_WAIT_WHILE_TIMER: /* for selection machine */ 400 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec); 401 break; 402 } 403 404 return retval; 405 } 406 407 408 /* ================= ad_rx_machine helper functions ================== */ 409 410 /** 411 * __choose_matched - update a port's matched variable from a received lacpdu 412 * @lacpdu: the lacpdu we've received 413 * @port: the port we're looking at 414 * 415 * Update the value of the matched variable, using parameter values from a 416 * newly received lacpdu. Parameter values for the partner carried in the 417 * received PDU are compared with the corresponding operational parameter 418 * values for the actor. Matched is set to TRUE if all of these parameters 419 * match and the PDU parameter partner_state.aggregation has the same value as 420 * actor_oper_port_state.aggregation and lacp will actively maintain the link 421 * in the aggregation. Matched is also set to TRUE if the value of 422 * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates 423 * an individual link and lacp will actively maintain the link. Otherwise, 424 * matched is set to FALSE. LACP is considered to be actively maintaining the 425 * link if either the PDU's actor_state.lacp_activity variable is TRUE or both 426 * the actor's actor_oper_port_state.lacp_activity and the PDU's 427 * partner_state.lacp_activity variables are TRUE. 428 * 429 * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is 430 * used here to implement the language from 802.3ad 43.4.9 that requires 431 * recordPDU to "match" the LACPDU parameters to the stored values. 432 */ 433 static void __choose_matched(struct lacpdu *lacpdu, struct port *port) 434 { 435 /* check if all parameters are alike 436 * or this is individual link(aggregation == FALSE) 437 * then update the state machine Matched variable. 438 */ 439 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) && 440 (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) && 441 MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) && 442 (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) && 443 (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) && 444 ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) || 445 ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0) 446 ) { 447 port->sm_vars |= AD_PORT_MATCHED; 448 } else { 449 port->sm_vars &= ~AD_PORT_MATCHED; 450 } 451 } 452 453 /** 454 * __record_pdu - record parameters from a received lacpdu 455 * @lacpdu: the lacpdu we've received 456 * @port: the port we're looking at 457 * 458 * Record the parameter values for the Actor carried in a received lacpdu as 459 * the current partner operational parameter values and sets 460 * actor_oper_port_state.defaulted to FALSE. 461 */ 462 static void __record_pdu(struct lacpdu *lacpdu, struct port *port) 463 { 464 if (lacpdu && port) { 465 struct port_params *partner = &port->partner_oper; 466 467 __choose_matched(lacpdu, port); 468 /* record the new parameter values for the partner 469 * operational 470 */ 471 partner->port_number = ntohs(lacpdu->actor_port); 472 partner->port_priority = ntohs(lacpdu->actor_port_priority); 473 partner->system = lacpdu->actor_system; 474 partner->system_priority = ntohs(lacpdu->actor_system_priority); 475 partner->key = ntohs(lacpdu->actor_key); 476 partner->port_state = lacpdu->actor_state; 477 478 /* set actor_oper_port_state.defaulted to FALSE */ 479 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED; 480 481 /* set the partner sync. to on if the partner is sync, 482 * and the port is matched 483 */ 484 if ((port->sm_vars & AD_PORT_MATCHED) && 485 (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) { 486 partner->port_state |= AD_STATE_SYNCHRONIZATION; 487 pr_debug("%s partner sync=1\n", port->slave->dev->name); 488 } else { 489 partner->port_state &= ~AD_STATE_SYNCHRONIZATION; 490 pr_debug("%s partner sync=0\n", port->slave->dev->name); 491 } 492 } 493 } 494 495 /** 496 * __record_default - record default parameters 497 * @port: the port we're looking at 498 * 499 * This function records the default parameter values for the partner carried 500 * in the Partner Admin parameters as the current partner operational parameter 501 * values and sets actor_oper_port_state.defaulted to TRUE. 502 */ 503 static void __record_default(struct port *port) 504 { 505 if (port) { 506 /* record the partner admin parameters */ 507 memcpy(&port->partner_oper, &port->partner_admin, 508 sizeof(struct port_params)); 509 510 /* set actor_oper_port_state.defaulted to true */ 511 port->actor_oper_port_state |= AD_STATE_DEFAULTED; 512 } 513 } 514 515 /** 516 * __update_selected - update a port's Selected variable from a received lacpdu 517 * @lacpdu: the lacpdu we've received 518 * @port: the port we're looking at 519 * 520 * Update the value of the selected variable, using parameter values from a 521 * newly received lacpdu. The parameter values for the Actor carried in the 522 * received PDU are compared with the corresponding operational parameter 523 * values for the ports partner. If one or more of the comparisons shows that 524 * the value(s) received in the PDU differ from the current operational values, 525 * then selected is set to FALSE and actor_oper_port_state.synchronization is 526 * set to out_of_sync. Otherwise, selected remains unchanged. 527 */ 528 static void __update_selected(struct lacpdu *lacpdu, struct port *port) 529 { 530 if (lacpdu && port) { 531 const struct port_params *partner = &port->partner_oper; 532 533 /* check if any parameter is different then 534 * update the state machine selected variable. 535 */ 536 if (ntohs(lacpdu->actor_port) != partner->port_number || 537 ntohs(lacpdu->actor_port_priority) != partner->port_priority || 538 !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) || 539 ntohs(lacpdu->actor_system_priority) != partner->system_priority || 540 ntohs(lacpdu->actor_key) != partner->key || 541 (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) { 542 port->sm_vars &= ~AD_PORT_SELECTED; 543 } 544 } 545 } 546 547 /** 548 * __update_default_selected - update a port's Selected variable from Partner 549 * @port: the port we're looking at 550 * 551 * This function updates the value of the selected variable, using the partner 552 * administrative parameter values. The administrative values are compared with 553 * the corresponding operational parameter values for the partner. If one or 554 * more of the comparisons shows that the administrative value(s) differ from 555 * the current operational values, then Selected is set to FALSE and 556 * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise, 557 * Selected remains unchanged. 558 */ 559 static void __update_default_selected(struct port *port) 560 { 561 if (port) { 562 const struct port_params *admin = &port->partner_admin; 563 const struct port_params *oper = &port->partner_oper; 564 565 /* check if any parameter is different then 566 * update the state machine selected variable. 567 */ 568 if (admin->port_number != oper->port_number || 569 admin->port_priority != oper->port_priority || 570 !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) || 571 admin->system_priority != oper->system_priority || 572 admin->key != oper->key || 573 (admin->port_state & AD_STATE_AGGREGATION) 574 != (oper->port_state & AD_STATE_AGGREGATION)) { 575 port->sm_vars &= ~AD_PORT_SELECTED; 576 } 577 } 578 } 579 580 /** 581 * __update_ntt - update a port's ntt variable from a received lacpdu 582 * @lacpdu: the lacpdu we've received 583 * @port: the port we're looking at 584 * 585 * Updates the value of the ntt variable, using parameter values from a newly 586 * received lacpdu. The parameter values for the partner carried in the 587 * received PDU are compared with the corresponding operational parameter 588 * values for the Actor. If one or more of the comparisons shows that the 589 * value(s) received in the PDU differ from the current operational values, 590 * then ntt is set to TRUE. Otherwise, ntt remains unchanged. 591 */ 592 static void __update_ntt(struct lacpdu *lacpdu, struct port *port) 593 { 594 /* validate lacpdu and port */ 595 if (lacpdu && port) { 596 /* check if any parameter is different then 597 * update the port->ntt. 598 */ 599 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) || 600 (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) || 601 !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) || 602 (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) || 603 (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) || 604 ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) || 605 ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) || 606 ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) || 607 ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION)) 608 ) { 609 port->ntt = true; 610 } 611 } 612 } 613 614 /** 615 * __agg_ports_are_ready - check if all ports in an aggregator are ready 616 * @aggregator: the aggregator we're looking at 617 * 618 */ 619 static int __agg_ports_are_ready(struct aggregator *aggregator) 620 { 621 struct port *port; 622 int retval = 1; 623 624 if (aggregator) { 625 /* scan all ports in this aggregator to verfy if they are 626 * all ready. 627 */ 628 for (port = aggregator->lag_ports; 629 port; 630 port = port->next_port_in_aggregator) { 631 if (!(port->sm_vars & AD_PORT_READY_N)) { 632 retval = 0; 633 break; 634 } 635 } 636 } 637 638 return retval; 639 } 640 641 /** 642 * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator 643 * @aggregator: the aggregator we're looking at 644 * @val: Should the ports' ready bit be set on or off 645 * 646 */ 647 static void __set_agg_ports_ready(struct aggregator *aggregator, int val) 648 { 649 struct port *port; 650 651 for (port = aggregator->lag_ports; port; 652 port = port->next_port_in_aggregator) { 653 if (val) 654 port->sm_vars |= AD_PORT_READY; 655 else 656 port->sm_vars &= ~AD_PORT_READY; 657 } 658 } 659 660 /** 661 * __get_agg_bandwidth - get the total bandwidth of an aggregator 662 * @aggregator: the aggregator we're looking at 663 * 664 */ 665 static u32 __get_agg_bandwidth(struct aggregator *aggregator) 666 { 667 u32 bandwidth = 0; 668 669 if (aggregator->num_of_ports) { 670 switch (__get_link_speed(aggregator->lag_ports)) { 671 case AD_LINK_SPEED_1MBPS: 672 bandwidth = aggregator->num_of_ports; 673 break; 674 case AD_LINK_SPEED_10MBPS: 675 bandwidth = aggregator->num_of_ports * 10; 676 break; 677 case AD_LINK_SPEED_100MBPS: 678 bandwidth = aggregator->num_of_ports * 100; 679 break; 680 case AD_LINK_SPEED_1000MBPS: 681 bandwidth = aggregator->num_of_ports * 1000; 682 break; 683 case AD_LINK_SPEED_2500MBPS: 684 bandwidth = aggregator->num_of_ports * 2500; 685 break; 686 case AD_LINK_SPEED_10000MBPS: 687 bandwidth = aggregator->num_of_ports * 10000; 688 break; 689 case AD_LINK_SPEED_20000MBPS: 690 bandwidth = aggregator->num_of_ports * 20000; 691 break; 692 case AD_LINK_SPEED_40000MBPS: 693 bandwidth = aggregator->num_of_ports * 40000; 694 break; 695 case AD_LINK_SPEED_56000MBPS: 696 bandwidth = aggregator->num_of_ports * 56000; 697 break; 698 case AD_LINK_SPEED_100000MBPS: 699 bandwidth = aggregator->num_of_ports * 100000; 700 break; 701 default: 702 bandwidth = 0; /* to silence the compiler */ 703 } 704 } 705 return bandwidth; 706 } 707 708 /** 709 * __get_active_agg - get the current active aggregator 710 * @aggregator: the aggregator we're looking at 711 * 712 * Caller must hold RCU lock. 713 */ 714 static struct aggregator *__get_active_agg(struct aggregator *aggregator) 715 { 716 struct bonding *bond = aggregator->slave->bond; 717 struct list_head *iter; 718 struct slave *slave; 719 720 bond_for_each_slave_rcu(bond, slave, iter) 721 if (SLAVE_AD_INFO(slave)->aggregator.is_active) 722 return &(SLAVE_AD_INFO(slave)->aggregator); 723 724 return NULL; 725 } 726 727 /** 728 * __update_lacpdu_from_port - update a port's lacpdu fields 729 * @port: the port we're looking at 730 */ 731 static inline void __update_lacpdu_from_port(struct port *port) 732 { 733 struct lacpdu *lacpdu = &port->lacpdu; 734 const struct port_params *partner = &port->partner_oper; 735 736 /* update current actual Actor parameters 737 * lacpdu->subtype initialized 738 * lacpdu->version_number initialized 739 * lacpdu->tlv_type_actor_info initialized 740 * lacpdu->actor_information_length initialized 741 */ 742 743 lacpdu->actor_system_priority = htons(port->actor_system_priority); 744 lacpdu->actor_system = port->actor_system; 745 lacpdu->actor_key = htons(port->actor_oper_port_key); 746 lacpdu->actor_port_priority = htons(port->actor_port_priority); 747 lacpdu->actor_port = htons(port->actor_port_number); 748 lacpdu->actor_state = port->actor_oper_port_state; 749 pr_debug("update lacpdu: %s, actor port state %x\n", 750 port->slave->dev->name, port->actor_oper_port_state); 751 752 /* lacpdu->reserved_3_1 initialized 753 * lacpdu->tlv_type_partner_info initialized 754 * lacpdu->partner_information_length initialized 755 */ 756 757 lacpdu->partner_system_priority = htons(partner->system_priority); 758 lacpdu->partner_system = partner->system; 759 lacpdu->partner_key = htons(partner->key); 760 lacpdu->partner_port_priority = htons(partner->port_priority); 761 lacpdu->partner_port = htons(partner->port_number); 762 lacpdu->partner_state = partner->port_state; 763 764 /* lacpdu->reserved_3_2 initialized 765 * lacpdu->tlv_type_collector_info initialized 766 * lacpdu->collector_information_length initialized 767 * collector_max_delay initialized 768 * reserved_12[12] initialized 769 * tlv_type_terminator initialized 770 * terminator_length initialized 771 * reserved_50[50] initialized 772 */ 773 } 774 775 /* ================= main 802.3ad protocol code ========================= */ 776 777 /** 778 * ad_lacpdu_send - send out a lacpdu packet on a given port 779 * @port: the port we're looking at 780 * 781 * Returns: 0 on success 782 * < 0 on error 783 */ 784 static int ad_lacpdu_send(struct port *port) 785 { 786 struct slave *slave = port->slave; 787 struct sk_buff *skb; 788 struct lacpdu_header *lacpdu_header; 789 int length = sizeof(struct lacpdu_header); 790 791 skb = dev_alloc_skb(length); 792 if (!skb) 793 return -ENOMEM; 794 795 skb->dev = slave->dev; 796 skb_reset_mac_header(skb); 797 skb->network_header = skb->mac_header + ETH_HLEN; 798 skb->protocol = PKT_TYPE_LACPDU; 799 skb->priority = TC_PRIO_CONTROL; 800 801 lacpdu_header = (struct lacpdu_header *)skb_put(skb, length); 802 803 ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr); 804 /* Note: source address is set to be the member's PERMANENT address, 805 * because we use it to identify loopback lacpdus in receive. 806 */ 807 ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr); 808 lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU; 809 810 lacpdu_header->lacpdu = port->lacpdu; 811 812 dev_queue_xmit(skb); 813 814 return 0; 815 } 816 817 /** 818 * ad_marker_send - send marker information/response on a given port 819 * @port: the port we're looking at 820 * @marker: marker data to send 821 * 822 * Returns: 0 on success 823 * < 0 on error 824 */ 825 static int ad_marker_send(struct port *port, struct bond_marker *marker) 826 { 827 struct slave *slave = port->slave; 828 struct sk_buff *skb; 829 struct bond_marker_header *marker_header; 830 int length = sizeof(struct bond_marker_header); 831 832 skb = dev_alloc_skb(length + 16); 833 if (!skb) 834 return -ENOMEM; 835 836 skb_reserve(skb, 16); 837 838 skb->dev = slave->dev; 839 skb_reset_mac_header(skb); 840 skb->network_header = skb->mac_header + ETH_HLEN; 841 skb->protocol = PKT_TYPE_LACPDU; 842 843 marker_header = (struct bond_marker_header *)skb_put(skb, length); 844 845 ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr); 846 /* Note: source address is set to be the member's PERMANENT address, 847 * because we use it to identify loopback MARKERs in receive. 848 */ 849 ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr); 850 marker_header->hdr.h_proto = PKT_TYPE_LACPDU; 851 852 marker_header->marker = *marker; 853 854 dev_queue_xmit(skb); 855 856 return 0; 857 } 858 859 /** 860 * ad_mux_machine - handle a port's mux state machine 861 * @port: the port we're looking at 862 * @update_slave_arr: Does slave array need update? 863 */ 864 static void ad_mux_machine(struct port *port, bool *update_slave_arr) 865 { 866 mux_states_t last_state; 867 868 /* keep current State Machine state to compare later if it was 869 * changed 870 */ 871 last_state = port->sm_mux_state; 872 873 if (port->sm_vars & AD_PORT_BEGIN) { 874 port->sm_mux_state = AD_MUX_DETACHED; 875 } else { 876 switch (port->sm_mux_state) { 877 case AD_MUX_DETACHED: 878 if ((port->sm_vars & AD_PORT_SELECTED) 879 || (port->sm_vars & AD_PORT_STANDBY)) 880 /* if SELECTED or STANDBY */ 881 port->sm_mux_state = AD_MUX_WAITING; 882 break; 883 case AD_MUX_WAITING: 884 /* if SELECTED == FALSE return to DETACH state */ 885 if (!(port->sm_vars & AD_PORT_SELECTED)) { 886 port->sm_vars &= ~AD_PORT_READY_N; 887 /* in order to withhold the Selection Logic to 888 * check all ports READY_N value every callback 889 * cycle to update ready variable, we check 890 * READY_N and update READY here 891 */ 892 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 893 port->sm_mux_state = AD_MUX_DETACHED; 894 break; 895 } 896 897 /* check if the wait_while_timer expired */ 898 if (port->sm_mux_timer_counter 899 && !(--port->sm_mux_timer_counter)) 900 port->sm_vars |= AD_PORT_READY_N; 901 902 /* in order to withhold the selection logic to check 903 * all ports READY_N value every callback cycle to 904 * update ready variable, we check READY_N and update 905 * READY here 906 */ 907 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 908 909 /* if the wait_while_timer expired, and the port is 910 * in READY state, move to ATTACHED state 911 */ 912 if ((port->sm_vars & AD_PORT_READY) 913 && !port->sm_mux_timer_counter) 914 port->sm_mux_state = AD_MUX_ATTACHED; 915 break; 916 case AD_MUX_ATTACHED: 917 /* check also if agg_select_timer expired (so the 918 * edable port will take place only after this timer) 919 */ 920 if ((port->sm_vars & AD_PORT_SELECTED) && 921 (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && 922 !__check_agg_selection_timer(port)) { 923 if (port->aggregator->is_active) 924 port->sm_mux_state = 925 AD_MUX_COLLECTING_DISTRIBUTING; 926 } else if (!(port->sm_vars & AD_PORT_SELECTED) || 927 (port->sm_vars & AD_PORT_STANDBY)) { 928 /* if UNSELECTED or STANDBY */ 929 port->sm_vars &= ~AD_PORT_READY_N; 930 /* in order to withhold the selection logic to 931 * check all ports READY_N value every callback 932 * cycle to update ready variable, we check 933 * READY_N and update READY here 934 */ 935 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator)); 936 port->sm_mux_state = AD_MUX_DETACHED; 937 } else if (port->aggregator->is_active) { 938 port->actor_oper_port_state |= 939 AD_STATE_SYNCHRONIZATION; 940 } 941 break; 942 case AD_MUX_COLLECTING_DISTRIBUTING: 943 if (!(port->sm_vars & AD_PORT_SELECTED) || 944 (port->sm_vars & AD_PORT_STANDBY) || 945 !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) || 946 !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) { 947 port->sm_mux_state = AD_MUX_ATTACHED; 948 } else { 949 /* if port state hasn't changed make 950 * sure that a collecting distributing 951 * port in an active aggregator is enabled 952 */ 953 if (port->aggregator && 954 port->aggregator->is_active && 955 !__port_is_enabled(port)) { 956 957 __enable_port(port); 958 } 959 } 960 break; 961 default: 962 break; 963 } 964 } 965 966 /* check if the state machine was changed */ 967 if (port->sm_mux_state != last_state) { 968 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n", 969 port->actor_port_number, 970 port->slave->dev->name, 971 last_state, 972 port->sm_mux_state); 973 switch (port->sm_mux_state) { 974 case AD_MUX_DETACHED: 975 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION; 976 ad_disable_collecting_distributing(port, 977 update_slave_arr); 978 port->actor_oper_port_state &= ~AD_STATE_COLLECTING; 979 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING; 980 port->ntt = true; 981 break; 982 case AD_MUX_WAITING: 983 port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0); 984 break; 985 case AD_MUX_ATTACHED: 986 if (port->aggregator->is_active) 987 port->actor_oper_port_state |= 988 AD_STATE_SYNCHRONIZATION; 989 else 990 port->actor_oper_port_state &= 991 ~AD_STATE_SYNCHRONIZATION; 992 port->actor_oper_port_state &= ~AD_STATE_COLLECTING; 993 port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING; 994 ad_disable_collecting_distributing(port, 995 update_slave_arr); 996 port->ntt = true; 997 break; 998 case AD_MUX_COLLECTING_DISTRIBUTING: 999 port->actor_oper_port_state |= AD_STATE_COLLECTING; 1000 port->actor_oper_port_state |= AD_STATE_DISTRIBUTING; 1001 port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION; 1002 ad_enable_collecting_distributing(port, 1003 update_slave_arr); 1004 port->ntt = true; 1005 break; 1006 default: 1007 break; 1008 } 1009 } 1010 } 1011 1012 /** 1013 * ad_rx_machine - handle a port's rx State Machine 1014 * @lacpdu: the lacpdu we've received 1015 * @port: the port we're looking at 1016 * 1017 * If lacpdu arrived, stop previous timer (if exists) and set the next state as 1018 * CURRENT. If timer expired set the state machine in the proper state. 1019 * In other cases, this function checks if we need to switch to other state. 1020 */ 1021 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port) 1022 { 1023 rx_states_t last_state; 1024 1025 /* keep current State Machine state to compare later if it was 1026 * changed 1027 */ 1028 last_state = port->sm_rx_state; 1029 1030 /* check if state machine should change state */ 1031 1032 /* first, check if port was reinitialized */ 1033 if (port->sm_vars & AD_PORT_BEGIN) { 1034 port->sm_rx_state = AD_RX_INITIALIZE; 1035 port->sm_vars |= AD_PORT_CHURNED; 1036 /* check if port is not enabled */ 1037 } else if (!(port->sm_vars & AD_PORT_BEGIN) 1038 && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) 1039 port->sm_rx_state = AD_RX_PORT_DISABLED; 1040 /* check if new lacpdu arrived */ 1041 else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || 1042 (port->sm_rx_state == AD_RX_DEFAULTED) || 1043 (port->sm_rx_state == AD_RX_CURRENT))) { 1044 if (port->sm_rx_state != AD_RX_CURRENT) 1045 port->sm_vars |= AD_PORT_CHURNED; 1046 port->sm_rx_timer_counter = 0; 1047 port->sm_rx_state = AD_RX_CURRENT; 1048 } else { 1049 /* if timer is on, and if it is expired */ 1050 if (port->sm_rx_timer_counter && 1051 !(--port->sm_rx_timer_counter)) { 1052 switch (port->sm_rx_state) { 1053 case AD_RX_EXPIRED: 1054 port->sm_rx_state = AD_RX_DEFAULTED; 1055 break; 1056 case AD_RX_CURRENT: 1057 port->sm_rx_state = AD_RX_EXPIRED; 1058 break; 1059 default: 1060 break; 1061 } 1062 } else { 1063 /* if no lacpdu arrived and no timer is on */ 1064 switch (port->sm_rx_state) { 1065 case AD_RX_PORT_DISABLED: 1066 if (port->sm_vars & AD_PORT_MOVED) 1067 port->sm_rx_state = AD_RX_INITIALIZE; 1068 else if (port->is_enabled 1069 && (port->sm_vars 1070 & AD_PORT_LACP_ENABLED)) 1071 port->sm_rx_state = AD_RX_EXPIRED; 1072 else if (port->is_enabled 1073 && ((port->sm_vars 1074 & AD_PORT_LACP_ENABLED) == 0)) 1075 port->sm_rx_state = AD_RX_LACP_DISABLED; 1076 break; 1077 default: 1078 break; 1079 1080 } 1081 } 1082 } 1083 1084 /* check if the State machine was changed or new lacpdu arrived */ 1085 if ((port->sm_rx_state != last_state) || (lacpdu)) { 1086 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n", 1087 port->actor_port_number, 1088 port->slave->dev->name, 1089 last_state, 1090 port->sm_rx_state); 1091 switch (port->sm_rx_state) { 1092 case AD_RX_INITIALIZE: 1093 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)) 1094 port->sm_vars &= ~AD_PORT_LACP_ENABLED; 1095 else 1096 port->sm_vars |= AD_PORT_LACP_ENABLED; 1097 port->sm_vars &= ~AD_PORT_SELECTED; 1098 __record_default(port); 1099 port->actor_oper_port_state &= ~AD_STATE_EXPIRED; 1100 port->sm_vars &= ~AD_PORT_MOVED; 1101 port->sm_rx_state = AD_RX_PORT_DISABLED; 1102 1103 /* Fall Through */ 1104 case AD_RX_PORT_DISABLED: 1105 port->sm_vars &= ~AD_PORT_MATCHED; 1106 break; 1107 case AD_RX_LACP_DISABLED: 1108 port->sm_vars &= ~AD_PORT_SELECTED; 1109 __record_default(port); 1110 port->partner_oper.port_state &= ~AD_STATE_AGGREGATION; 1111 port->sm_vars |= AD_PORT_MATCHED; 1112 port->actor_oper_port_state &= ~AD_STATE_EXPIRED; 1113 break; 1114 case AD_RX_EXPIRED: 1115 /* Reset of the Synchronization flag (Standard 43.4.12) 1116 * This reset cause to disable this port in the 1117 * COLLECTING_DISTRIBUTING state of the mux machine in 1118 * case of EXPIRED even if LINK_DOWN didn't arrive for 1119 * the port. 1120 */ 1121 port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION; 1122 port->sm_vars &= ~AD_PORT_MATCHED; 1123 port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT; 1124 port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY; 1125 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT)); 1126 port->actor_oper_port_state |= AD_STATE_EXPIRED; 1127 port->sm_vars |= AD_PORT_CHURNED; 1128 break; 1129 case AD_RX_DEFAULTED: 1130 __update_default_selected(port); 1131 __record_default(port); 1132 port->sm_vars |= AD_PORT_MATCHED; 1133 port->actor_oper_port_state &= ~AD_STATE_EXPIRED; 1134 break; 1135 case AD_RX_CURRENT: 1136 /* detect loopback situation */ 1137 if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system), 1138 &(port->actor_system))) { 1139 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n" 1140 "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n", 1141 port->slave->dev->name); 1142 return; 1143 } 1144 __update_selected(lacpdu, port); 1145 __update_ntt(lacpdu, port); 1146 __record_pdu(lacpdu, port); 1147 port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)); 1148 port->actor_oper_port_state &= ~AD_STATE_EXPIRED; 1149 break; 1150 default: 1151 break; 1152 } 1153 } 1154 } 1155 1156 /** 1157 * ad_churn_machine - handle port churn's state machine 1158 * @port: the port we're looking at 1159 * 1160 */ 1161 static void ad_churn_machine(struct port *port) 1162 { 1163 if (port->sm_vars & AD_PORT_CHURNED) { 1164 port->sm_vars &= ~AD_PORT_CHURNED; 1165 port->sm_churn_actor_state = AD_CHURN_MONITOR; 1166 port->sm_churn_partner_state = AD_CHURN_MONITOR; 1167 port->sm_churn_actor_timer_counter = 1168 __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0); 1169 port->sm_churn_partner_timer_counter = 1170 __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0); 1171 return; 1172 } 1173 if (port->sm_churn_actor_timer_counter && 1174 !(--port->sm_churn_actor_timer_counter) && 1175 port->sm_churn_actor_state == AD_CHURN_MONITOR) { 1176 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) { 1177 port->sm_churn_actor_state = AD_NO_CHURN; 1178 } else { 1179 port->churn_actor_count++; 1180 port->sm_churn_actor_state = AD_CHURN; 1181 } 1182 } 1183 if (port->sm_churn_partner_timer_counter && 1184 !(--port->sm_churn_partner_timer_counter) && 1185 port->sm_churn_partner_state == AD_CHURN_MONITOR) { 1186 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) { 1187 port->sm_churn_partner_state = AD_NO_CHURN; 1188 } else { 1189 port->churn_partner_count++; 1190 port->sm_churn_partner_state = AD_CHURN; 1191 } 1192 } 1193 } 1194 1195 /** 1196 * ad_tx_machine - handle a port's tx state machine 1197 * @port: the port we're looking at 1198 */ 1199 static void ad_tx_machine(struct port *port) 1200 { 1201 /* check if tx timer expired, to verify that we do not send more than 1202 * 3 packets per second 1203 */ 1204 if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) { 1205 /* check if there is something to send */ 1206 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) { 1207 __update_lacpdu_from_port(port); 1208 1209 if (ad_lacpdu_send(port) >= 0) { 1210 pr_debug("Sent LACPDU on port %d\n", 1211 port->actor_port_number); 1212 1213 /* mark ntt as false, so it will not be sent 1214 * again until demanded 1215 */ 1216 port->ntt = false; 1217 } 1218 } 1219 /* restart tx timer(to verify that we will not exceed 1220 * AD_MAX_TX_IN_SECOND 1221 */ 1222 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND; 1223 } 1224 } 1225 1226 /** 1227 * ad_periodic_machine - handle a port's periodic state machine 1228 * @port: the port we're looking at 1229 * 1230 * Turn ntt flag on priodically to perform periodic transmission of lacpdu's. 1231 */ 1232 static void ad_periodic_machine(struct port *port) 1233 { 1234 periodic_states_t last_state; 1235 1236 /* keep current state machine state to compare later if it was changed */ 1237 last_state = port->sm_periodic_state; 1238 1239 /* check if port was reinitialized */ 1240 if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) || 1241 (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY)) 1242 ) { 1243 port->sm_periodic_state = AD_NO_PERIODIC; 1244 } 1245 /* check if state machine should change state */ 1246 else if (port->sm_periodic_timer_counter) { 1247 /* check if periodic state machine expired */ 1248 if (!(--port->sm_periodic_timer_counter)) { 1249 /* if expired then do tx */ 1250 port->sm_periodic_state = AD_PERIODIC_TX; 1251 } else { 1252 /* If not expired, check if there is some new timeout 1253 * parameter from the partner state 1254 */ 1255 switch (port->sm_periodic_state) { 1256 case AD_FAST_PERIODIC: 1257 if (!(port->partner_oper.port_state 1258 & AD_STATE_LACP_TIMEOUT)) 1259 port->sm_periodic_state = AD_SLOW_PERIODIC; 1260 break; 1261 case AD_SLOW_PERIODIC: 1262 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) { 1263 port->sm_periodic_timer_counter = 0; 1264 port->sm_periodic_state = AD_PERIODIC_TX; 1265 } 1266 break; 1267 default: 1268 break; 1269 } 1270 } 1271 } else { 1272 switch (port->sm_periodic_state) { 1273 case AD_NO_PERIODIC: 1274 port->sm_periodic_state = AD_FAST_PERIODIC; 1275 break; 1276 case AD_PERIODIC_TX: 1277 if (!(port->partner_oper.port_state & 1278 AD_STATE_LACP_TIMEOUT)) 1279 port->sm_periodic_state = AD_SLOW_PERIODIC; 1280 else 1281 port->sm_periodic_state = AD_FAST_PERIODIC; 1282 break; 1283 default: 1284 break; 1285 } 1286 } 1287 1288 /* check if the state machine was changed */ 1289 if (port->sm_periodic_state != last_state) { 1290 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", 1291 port->actor_port_number, last_state, 1292 port->sm_periodic_state); 1293 switch (port->sm_periodic_state) { 1294 case AD_NO_PERIODIC: 1295 port->sm_periodic_timer_counter = 0; 1296 break; 1297 case AD_FAST_PERIODIC: 1298 /* decrement 1 tick we lost in the PERIODIC_TX cycle */ 1299 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; 1300 break; 1301 case AD_SLOW_PERIODIC: 1302 /* decrement 1 tick we lost in the PERIODIC_TX cycle */ 1303 port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; 1304 break; 1305 case AD_PERIODIC_TX: 1306 port->ntt = true; 1307 break; 1308 default: 1309 break; 1310 } 1311 } 1312 } 1313 1314 /** 1315 * ad_port_selection_logic - select aggregation groups 1316 * @port: the port we're looking at 1317 * @update_slave_arr: Does slave array need update? 1318 * 1319 * Select aggregation groups, and assign each port for it's aggregetor. The 1320 * selection logic is called in the inititalization (after all the handshkes), 1321 * and after every lacpdu receive (if selected is off). 1322 */ 1323 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr) 1324 { 1325 struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator; 1326 struct port *last_port = NULL, *curr_port; 1327 struct list_head *iter; 1328 struct bonding *bond; 1329 struct slave *slave; 1330 int found = 0; 1331 1332 /* if the port is already Selected, do nothing */ 1333 if (port->sm_vars & AD_PORT_SELECTED) 1334 return; 1335 1336 bond = __get_bond_by_port(port); 1337 1338 /* if the port is connected to other aggregator, detach it */ 1339 if (port->aggregator) { 1340 /* detach the port from its former aggregator */ 1341 temp_aggregator = port->aggregator; 1342 for (curr_port = temp_aggregator->lag_ports; curr_port; 1343 last_port = curr_port, 1344 curr_port = curr_port->next_port_in_aggregator) { 1345 if (curr_port == port) { 1346 temp_aggregator->num_of_ports--; 1347 /* if it is the first port attached to the 1348 * aggregator 1349 */ 1350 if (!last_port) { 1351 temp_aggregator->lag_ports = 1352 port->next_port_in_aggregator; 1353 } else { 1354 /* not the first port attached to the 1355 * aggregator 1356 */ 1357 last_port->next_port_in_aggregator = 1358 port->next_port_in_aggregator; 1359 } 1360 1361 /* clear the port's relations to this 1362 * aggregator 1363 */ 1364 port->aggregator = NULL; 1365 port->next_port_in_aggregator = NULL; 1366 port->actor_port_aggregator_identifier = 0; 1367 1368 netdev_dbg(bond->dev, "Port %d left LAG %d\n", 1369 port->actor_port_number, 1370 temp_aggregator->aggregator_identifier); 1371 /* if the aggregator is empty, clear its 1372 * parameters, and set it ready to be attached 1373 */ 1374 if (!temp_aggregator->lag_ports) 1375 ad_clear_agg(temp_aggregator); 1376 break; 1377 } 1378 } 1379 if (!curr_port) { 1380 /* meaning: the port was related to an aggregator 1381 * but was not on the aggregator port list 1382 */ 1383 net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n", 1384 port->slave->bond->dev->name, 1385 port->actor_port_number, 1386 port->slave->dev->name, 1387 port->aggregator->aggregator_identifier); 1388 } 1389 } 1390 /* search on all aggregators for a suitable aggregator for this port */ 1391 bond_for_each_slave(bond, slave, iter) { 1392 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 1393 1394 /* keep a free aggregator for later use(if needed) */ 1395 if (!aggregator->lag_ports) { 1396 if (!free_aggregator) 1397 free_aggregator = aggregator; 1398 continue; 1399 } 1400 /* check if current aggregator suits us */ 1401 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */ 1402 MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) && 1403 (aggregator->partner_system_priority == port->partner_oper.system_priority) && 1404 (aggregator->partner_oper_aggregator_key == port->partner_oper.key) 1405 ) && 1406 ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */ 1407 !aggregator->is_individual) /* but is not individual OR */ 1408 ) 1409 ) { 1410 /* attach to the founded aggregator */ 1411 port->aggregator = aggregator; 1412 port->actor_port_aggregator_identifier = 1413 port->aggregator->aggregator_identifier; 1414 port->next_port_in_aggregator = aggregator->lag_ports; 1415 port->aggregator->num_of_ports++; 1416 aggregator->lag_ports = port; 1417 netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n", 1418 port->actor_port_number, 1419 port->aggregator->aggregator_identifier); 1420 1421 /* mark this port as selected */ 1422 port->sm_vars |= AD_PORT_SELECTED; 1423 found = 1; 1424 break; 1425 } 1426 } 1427 1428 /* the port couldn't find an aggregator - attach it to a new 1429 * aggregator 1430 */ 1431 if (!found) { 1432 if (free_aggregator) { 1433 /* assign port a new aggregator */ 1434 port->aggregator = free_aggregator; 1435 port->actor_port_aggregator_identifier = 1436 port->aggregator->aggregator_identifier; 1437 1438 /* update the new aggregator's parameters 1439 * if port was responsed from the end-user 1440 */ 1441 if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS) 1442 /* if port is full duplex */ 1443 port->aggregator->is_individual = false; 1444 else 1445 port->aggregator->is_individual = true; 1446 1447 port->aggregator->actor_admin_aggregator_key = 1448 port->actor_admin_port_key; 1449 port->aggregator->actor_oper_aggregator_key = 1450 port->actor_oper_port_key; 1451 port->aggregator->partner_system = 1452 port->partner_oper.system; 1453 port->aggregator->partner_system_priority = 1454 port->partner_oper.system_priority; 1455 port->aggregator->partner_oper_aggregator_key = port->partner_oper.key; 1456 port->aggregator->receive_state = 1; 1457 port->aggregator->transmit_state = 1; 1458 port->aggregator->lag_ports = port; 1459 port->aggregator->num_of_ports++; 1460 1461 /* mark this port as selected */ 1462 port->sm_vars |= AD_PORT_SELECTED; 1463 1464 netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n", 1465 port->actor_port_number, 1466 port->aggregator->aggregator_identifier); 1467 } else { 1468 netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n", 1469 port->actor_port_number, port->slave->dev->name); 1470 } 1471 } 1472 /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE 1473 * in all aggregator's ports, else set ready=FALSE in all 1474 * aggregator's ports 1475 */ 1476 __set_agg_ports_ready(port->aggregator, 1477 __agg_ports_are_ready(port->aggregator)); 1478 1479 aggregator = __get_first_agg(port); 1480 ad_agg_selection_logic(aggregator, update_slave_arr); 1481 1482 if (!port->aggregator->is_active) 1483 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION; 1484 } 1485 1486 /* Decide if "agg" is a better choice for the new active aggregator that 1487 * the current best, according to the ad_select policy. 1488 */ 1489 static struct aggregator *ad_agg_selection_test(struct aggregator *best, 1490 struct aggregator *curr) 1491 { 1492 /* 0. If no best, select current. 1493 * 1494 * 1. If the current agg is not individual, and the best is 1495 * individual, select current. 1496 * 1497 * 2. If current agg is individual and the best is not, keep best. 1498 * 1499 * 3. Therefore, current and best are both individual or both not 1500 * individual, so: 1501 * 1502 * 3a. If current agg partner replied, and best agg partner did not, 1503 * select current. 1504 * 1505 * 3b. If current agg partner did not reply and best agg partner 1506 * did reply, keep best. 1507 * 1508 * 4. Therefore, current and best both have partner replies or 1509 * both do not, so perform selection policy: 1510 * 1511 * BOND_AD_COUNT: Select by count of ports. If count is equal, 1512 * select by bandwidth. 1513 * 1514 * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth. 1515 */ 1516 if (!best) 1517 return curr; 1518 1519 if (!curr->is_individual && best->is_individual) 1520 return curr; 1521 1522 if (curr->is_individual && !best->is_individual) 1523 return best; 1524 1525 if (__agg_has_partner(curr) && !__agg_has_partner(best)) 1526 return curr; 1527 1528 if (!__agg_has_partner(curr) && __agg_has_partner(best)) 1529 return best; 1530 1531 switch (__get_agg_selection_mode(curr->lag_ports)) { 1532 case BOND_AD_COUNT: 1533 if (curr->num_of_ports > best->num_of_ports) 1534 return curr; 1535 1536 if (curr->num_of_ports < best->num_of_ports) 1537 return best; 1538 1539 /*FALLTHROUGH*/ 1540 case BOND_AD_STABLE: 1541 case BOND_AD_BANDWIDTH: 1542 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best)) 1543 return curr; 1544 1545 break; 1546 1547 default: 1548 net_warn_ratelimited("%s: Impossible agg select mode %d\n", 1549 curr->slave->bond->dev->name, 1550 __get_agg_selection_mode(curr->lag_ports)); 1551 break; 1552 } 1553 1554 return best; 1555 } 1556 1557 static int agg_device_up(const struct aggregator *agg) 1558 { 1559 struct port *port = agg->lag_ports; 1560 1561 if (!port) 1562 return 0; 1563 1564 return netif_running(port->slave->dev) && 1565 netif_carrier_ok(port->slave->dev); 1566 } 1567 1568 /** 1569 * ad_agg_selection_logic - select an aggregation group for a team 1570 * @aggregator: the aggregator we're looking at 1571 * @update_slave_arr: Does slave array need update? 1572 * 1573 * It is assumed that only one aggregator may be selected for a team. 1574 * 1575 * The logic of this function is to select the aggregator according to 1576 * the ad_select policy: 1577 * 1578 * BOND_AD_STABLE: select the aggregator with the most ports attached to 1579 * it, and to reselect the active aggregator only if the previous 1580 * aggregator has no more ports related to it. 1581 * 1582 * BOND_AD_BANDWIDTH: select the aggregator with the highest total 1583 * bandwidth, and reselect whenever a link state change takes place or the 1584 * set of slaves in the bond changes. 1585 * 1586 * BOND_AD_COUNT: select the aggregator with largest number of ports 1587 * (slaves), and reselect whenever a link state change takes place or the 1588 * set of slaves in the bond changes. 1589 * 1590 * FIXME: this function MUST be called with the first agg in the bond, or 1591 * __get_active_agg() won't work correctly. This function should be better 1592 * called with the bond itself, and retrieve the first agg from it. 1593 */ 1594 static void ad_agg_selection_logic(struct aggregator *agg, 1595 bool *update_slave_arr) 1596 { 1597 struct aggregator *best, *active, *origin; 1598 struct bonding *bond = agg->slave->bond; 1599 struct list_head *iter; 1600 struct slave *slave; 1601 struct port *port; 1602 1603 rcu_read_lock(); 1604 origin = agg; 1605 active = __get_active_agg(agg); 1606 best = (active && agg_device_up(active)) ? active : NULL; 1607 1608 bond_for_each_slave_rcu(bond, slave, iter) { 1609 agg = &(SLAVE_AD_INFO(slave)->aggregator); 1610 1611 agg->is_active = 0; 1612 1613 if (agg->num_of_ports && agg_device_up(agg)) 1614 best = ad_agg_selection_test(best, agg); 1615 } 1616 1617 if (best && 1618 __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) { 1619 /* For the STABLE policy, don't replace the old active 1620 * aggregator if it's still active (it has an answering 1621 * partner) or if both the best and active don't have an 1622 * answering partner. 1623 */ 1624 if (active && active->lag_ports && 1625 active->lag_ports->is_enabled && 1626 (__agg_has_partner(active) || 1627 (!__agg_has_partner(active) && 1628 !__agg_has_partner(best)))) { 1629 if (!(!active->actor_oper_aggregator_key && 1630 best->actor_oper_aggregator_key)) { 1631 best = NULL; 1632 active->is_active = 1; 1633 } 1634 } 1635 } 1636 1637 if (best && (best == active)) { 1638 best = NULL; 1639 active->is_active = 1; 1640 } 1641 1642 /* if there is new best aggregator, activate it */ 1643 if (best) { 1644 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1645 best->aggregator_identifier, best->num_of_ports, 1646 best->actor_oper_aggregator_key, 1647 best->partner_oper_aggregator_key, 1648 best->is_individual, best->is_active); 1649 netdev_dbg(bond->dev, "best ports %p slave %p %s\n", 1650 best->lag_ports, best->slave, 1651 best->slave ? best->slave->dev->name : "NULL"); 1652 1653 bond_for_each_slave_rcu(bond, slave, iter) { 1654 agg = &(SLAVE_AD_INFO(slave)->aggregator); 1655 1656 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1657 agg->aggregator_identifier, agg->num_of_ports, 1658 agg->actor_oper_aggregator_key, 1659 agg->partner_oper_aggregator_key, 1660 agg->is_individual, agg->is_active); 1661 } 1662 1663 /* check if any partner replys */ 1664 if (best->is_individual) { 1665 net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n", 1666 best->slave ? 1667 best->slave->bond->dev->name : "NULL"); 1668 } 1669 1670 best->is_active = 1; 1671 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n", 1672 best->aggregator_identifier); 1673 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n", 1674 best->aggregator_identifier, best->num_of_ports, 1675 best->actor_oper_aggregator_key, 1676 best->partner_oper_aggregator_key, 1677 best->is_individual, best->is_active); 1678 1679 /* disable the ports that were related to the former 1680 * active_aggregator 1681 */ 1682 if (active) { 1683 for (port = active->lag_ports; port; 1684 port = port->next_port_in_aggregator) { 1685 __disable_port(port); 1686 } 1687 } 1688 /* Slave array needs update. */ 1689 *update_slave_arr = true; 1690 } 1691 1692 /* if the selected aggregator is of join individuals 1693 * (partner_system is NULL), enable their ports 1694 */ 1695 active = __get_active_agg(origin); 1696 1697 if (active) { 1698 if (!__agg_has_partner(active)) { 1699 for (port = active->lag_ports; port; 1700 port = port->next_port_in_aggregator) { 1701 __enable_port(port); 1702 } 1703 } 1704 } 1705 1706 rcu_read_unlock(); 1707 1708 bond_3ad_set_carrier(bond); 1709 } 1710 1711 /** 1712 * ad_clear_agg - clear a given aggregator's parameters 1713 * @aggregator: the aggregator we're looking at 1714 */ 1715 static void ad_clear_agg(struct aggregator *aggregator) 1716 { 1717 if (aggregator) { 1718 aggregator->is_individual = false; 1719 aggregator->actor_admin_aggregator_key = 0; 1720 aggregator->actor_oper_aggregator_key = 0; 1721 aggregator->partner_system = null_mac_addr; 1722 aggregator->partner_system_priority = 0; 1723 aggregator->partner_oper_aggregator_key = 0; 1724 aggregator->receive_state = 0; 1725 aggregator->transmit_state = 0; 1726 aggregator->lag_ports = NULL; 1727 aggregator->is_active = 0; 1728 aggregator->num_of_ports = 0; 1729 pr_debug("LAG %d was cleared\n", 1730 aggregator->aggregator_identifier); 1731 } 1732 } 1733 1734 /** 1735 * ad_initialize_agg - initialize a given aggregator's parameters 1736 * @aggregator: the aggregator we're looking at 1737 */ 1738 static void ad_initialize_agg(struct aggregator *aggregator) 1739 { 1740 if (aggregator) { 1741 ad_clear_agg(aggregator); 1742 1743 aggregator->aggregator_mac_address = null_mac_addr; 1744 aggregator->aggregator_identifier = 0; 1745 aggregator->slave = NULL; 1746 } 1747 } 1748 1749 /** 1750 * ad_initialize_port - initialize a given port's parameters 1751 * @aggregator: the aggregator we're looking at 1752 * @lacp_fast: boolean. whether fast periodic should be used 1753 */ 1754 static void ad_initialize_port(struct port *port, int lacp_fast) 1755 { 1756 static const struct port_params tmpl = { 1757 .system_priority = 0xffff, 1758 .key = 1, 1759 .port_number = 1, 1760 .port_priority = 0xff, 1761 .port_state = 1, 1762 }; 1763 static const struct lacpdu lacpdu = { 1764 .subtype = 0x01, 1765 .version_number = 0x01, 1766 .tlv_type_actor_info = 0x01, 1767 .actor_information_length = 0x14, 1768 .tlv_type_partner_info = 0x02, 1769 .partner_information_length = 0x14, 1770 .tlv_type_collector_info = 0x03, 1771 .collector_information_length = 0x10, 1772 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY), 1773 }; 1774 1775 if (port) { 1776 port->actor_port_priority = 0xff; 1777 port->actor_port_aggregator_identifier = 0; 1778 port->ntt = false; 1779 port->actor_admin_port_state = AD_STATE_AGGREGATION | 1780 AD_STATE_LACP_ACTIVITY; 1781 port->actor_oper_port_state = AD_STATE_AGGREGATION | 1782 AD_STATE_LACP_ACTIVITY; 1783 1784 if (lacp_fast) 1785 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT; 1786 1787 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl)); 1788 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl)); 1789 1790 port->is_enabled = true; 1791 /* private parameters */ 1792 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED; 1793 port->sm_rx_state = 0; 1794 port->sm_rx_timer_counter = 0; 1795 port->sm_periodic_state = 0; 1796 port->sm_periodic_timer_counter = 0; 1797 port->sm_mux_state = 0; 1798 port->sm_mux_timer_counter = 0; 1799 port->sm_tx_state = 0; 1800 port->aggregator = NULL; 1801 port->next_port_in_aggregator = NULL; 1802 port->transaction_id = 0; 1803 1804 port->sm_churn_actor_timer_counter = 0; 1805 port->sm_churn_actor_state = 0; 1806 port->churn_actor_count = 0; 1807 port->sm_churn_partner_timer_counter = 0; 1808 port->sm_churn_partner_state = 0; 1809 port->churn_partner_count = 0; 1810 1811 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu)); 1812 } 1813 } 1814 1815 /** 1816 * ad_enable_collecting_distributing - enable a port's transmit/receive 1817 * @port: the port we're looking at 1818 * @update_slave_arr: Does slave array need update? 1819 * 1820 * Enable @port if it's in an active aggregator 1821 */ 1822 static void ad_enable_collecting_distributing(struct port *port, 1823 bool *update_slave_arr) 1824 { 1825 if (port->aggregator->is_active) { 1826 pr_debug("Enabling port %d(LAG %d)\n", 1827 port->actor_port_number, 1828 port->aggregator->aggregator_identifier); 1829 __enable_port(port); 1830 /* Slave array needs update */ 1831 *update_slave_arr = true; 1832 } 1833 } 1834 1835 /** 1836 * ad_disable_collecting_distributing - disable a port's transmit/receive 1837 * @port: the port we're looking at 1838 * @update_slave_arr: Does slave array need update? 1839 */ 1840 static void ad_disable_collecting_distributing(struct port *port, 1841 bool *update_slave_arr) 1842 { 1843 if (port->aggregator && 1844 !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system), 1845 &(null_mac_addr))) { 1846 pr_debug("Disabling port %d(LAG %d)\n", 1847 port->actor_port_number, 1848 port->aggregator->aggregator_identifier); 1849 __disable_port(port); 1850 /* Slave array needs an update */ 1851 *update_slave_arr = true; 1852 } 1853 } 1854 1855 /** 1856 * ad_marker_info_received - handle receive of a Marker information frame 1857 * @marker_info: Marker info received 1858 * @port: the port we're looking at 1859 */ 1860 static void ad_marker_info_received(struct bond_marker *marker_info, 1861 struct port *port) 1862 { 1863 struct bond_marker marker; 1864 1865 /* copy the received marker data to the response marker */ 1866 memcpy(&marker, marker_info, sizeof(struct bond_marker)); 1867 /* change the marker subtype to marker response */ 1868 marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE; 1869 1870 /* send the marker response */ 1871 if (ad_marker_send(port, &marker) >= 0) { 1872 pr_debug("Sent Marker Response on port %d\n", 1873 port->actor_port_number); 1874 } 1875 } 1876 1877 /** 1878 * ad_marker_response_received - handle receive of a marker response frame 1879 * @marker: marker PDU received 1880 * @port: the port we're looking at 1881 * 1882 * This function does nothing since we decided not to implement send and handle 1883 * response for marker PDU's, in this stage, but only to respond to marker 1884 * information. 1885 */ 1886 static void ad_marker_response_received(struct bond_marker *marker, 1887 struct port *port) 1888 { 1889 /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */ 1890 } 1891 1892 /* ========= AD exported functions to the main bonding code ========= */ 1893 1894 /* Check aggregators status in team every T seconds */ 1895 #define AD_AGGREGATOR_SELECTION_TIMER 8 1896 1897 /** 1898 * bond_3ad_initiate_agg_selection - initate aggregator selection 1899 * @bond: bonding struct 1900 * 1901 * Set the aggregation selection timer, to initiate an agg selection in 1902 * the very near future. Called during first initialization, and during 1903 * any down to up transitions of the bond. 1904 */ 1905 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout) 1906 { 1907 BOND_AD_INFO(bond).agg_select_timer = timeout; 1908 } 1909 1910 /** 1911 * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures 1912 * @bond: bonding struct to work on 1913 * @tick_resolution: tick duration (millisecond resolution) 1914 * 1915 * Can be called only after the mac address of the bond is set. 1916 */ 1917 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution) 1918 { 1919 /* check that the bond is not initialized yet */ 1920 if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr), 1921 bond->dev->dev_addr)) { 1922 1923 BOND_AD_INFO(bond).aggregator_identifier = 0; 1924 1925 BOND_AD_INFO(bond).system.sys_priority = 1926 bond->params.ad_actor_sys_prio; 1927 if (is_zero_ether_addr(bond->params.ad_actor_system)) 1928 BOND_AD_INFO(bond).system.sys_mac_addr = 1929 *((struct mac_addr *)bond->dev->dev_addr); 1930 else 1931 BOND_AD_INFO(bond).system.sys_mac_addr = 1932 *((struct mac_addr *)bond->params.ad_actor_system); 1933 1934 /* initialize how many times this module is called in one 1935 * second (should be about every 100ms) 1936 */ 1937 ad_ticks_per_sec = tick_resolution; 1938 1939 bond_3ad_initiate_agg_selection(bond, 1940 AD_AGGREGATOR_SELECTION_TIMER * 1941 ad_ticks_per_sec); 1942 } 1943 } 1944 1945 /** 1946 * bond_3ad_bind_slave - initialize a slave's port 1947 * @slave: slave struct to work on 1948 * 1949 * Returns: 0 on success 1950 * < 0 on error 1951 */ 1952 void bond_3ad_bind_slave(struct slave *slave) 1953 { 1954 struct bonding *bond = bond_get_bond_by_slave(slave); 1955 struct port *port; 1956 struct aggregator *aggregator; 1957 1958 /* check that the slave has not been initialized yet. */ 1959 if (SLAVE_AD_INFO(slave)->port.slave != slave) { 1960 1961 /* port initialization */ 1962 port = &(SLAVE_AD_INFO(slave)->port); 1963 1964 ad_initialize_port(port, bond->params.lacp_fast); 1965 1966 port->slave = slave; 1967 port->actor_port_number = SLAVE_AD_INFO(slave)->id; 1968 /* key is determined according to the link speed, duplex and 1969 * user key 1970 */ 1971 port->actor_admin_port_key = bond->params.ad_user_port_key << 6; 1972 ad_update_actor_keys(port, false); 1973 /* actor system is the bond's system */ 1974 __ad_actor_update_port(port); 1975 /* tx timer(to verify that no more than MAX_TX_IN_SECOND 1976 * lacpdu's are sent in one second) 1977 */ 1978 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND; 1979 1980 __disable_port(port); 1981 1982 /* aggregator initialization */ 1983 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 1984 1985 ad_initialize_agg(aggregator); 1986 1987 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr); 1988 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier; 1989 aggregator->slave = slave; 1990 aggregator->is_active = 0; 1991 aggregator->num_of_ports = 0; 1992 } 1993 } 1994 1995 /** 1996 * bond_3ad_unbind_slave - deinitialize a slave's port 1997 * @slave: slave struct to work on 1998 * 1999 * Search for the aggregator that is related to this port, remove the 2000 * aggregator and assign another aggregator for other port related to it 2001 * (if any), and remove the port. 2002 */ 2003 void bond_3ad_unbind_slave(struct slave *slave) 2004 { 2005 struct port *port, *prev_port, *temp_port; 2006 struct aggregator *aggregator, *new_aggregator, *temp_aggregator; 2007 int select_new_active_agg = 0; 2008 struct bonding *bond = slave->bond; 2009 struct slave *slave_iter; 2010 struct list_head *iter; 2011 bool dummy_slave_update; /* Ignore this value as caller updates array */ 2012 2013 /* Sync against bond_3ad_state_machine_handler() */ 2014 spin_lock_bh(&bond->mode_lock); 2015 aggregator = &(SLAVE_AD_INFO(slave)->aggregator); 2016 port = &(SLAVE_AD_INFO(slave)->port); 2017 2018 /* if slave is null, the whole port is not initialized */ 2019 if (!port->slave) { 2020 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n", 2021 slave->dev->name); 2022 goto out; 2023 } 2024 2025 netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n", 2026 aggregator->aggregator_identifier); 2027 2028 /* Tell the partner that this port is not suitable for aggregation */ 2029 port->actor_oper_port_state &= ~AD_STATE_AGGREGATION; 2030 __update_lacpdu_from_port(port); 2031 ad_lacpdu_send(port); 2032 2033 /* check if this aggregator is occupied */ 2034 if (aggregator->lag_ports) { 2035 /* check if there are other ports related to this aggregator 2036 * except the port related to this slave(thats ensure us that 2037 * there is a reason to search for new aggregator, and that we 2038 * will find one 2039 */ 2040 if ((aggregator->lag_ports != port) || 2041 (aggregator->lag_ports->next_port_in_aggregator)) { 2042 /* find new aggregator for the related port(s) */ 2043 bond_for_each_slave(bond, slave_iter, iter) { 2044 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); 2045 /* if the new aggregator is empty, or it is 2046 * connected to our port only 2047 */ 2048 if (!new_aggregator->lag_ports || 2049 ((new_aggregator->lag_ports == port) && 2050 !new_aggregator->lag_ports->next_port_in_aggregator)) 2051 break; 2052 } 2053 if (!slave_iter) 2054 new_aggregator = NULL; 2055 2056 /* if new aggregator found, copy the aggregator's 2057 * parameters and connect the related lag_ports to the 2058 * new aggregator 2059 */ 2060 if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) { 2061 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n", 2062 aggregator->aggregator_identifier, 2063 new_aggregator->aggregator_identifier); 2064 2065 if ((new_aggregator->lag_ports == port) && 2066 new_aggregator->is_active) { 2067 netdev_info(bond->dev, "Removing an active aggregator\n"); 2068 select_new_active_agg = 1; 2069 } 2070 2071 new_aggregator->is_individual = aggregator->is_individual; 2072 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key; 2073 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key; 2074 new_aggregator->partner_system = aggregator->partner_system; 2075 new_aggregator->partner_system_priority = aggregator->partner_system_priority; 2076 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key; 2077 new_aggregator->receive_state = aggregator->receive_state; 2078 new_aggregator->transmit_state = aggregator->transmit_state; 2079 new_aggregator->lag_ports = aggregator->lag_ports; 2080 new_aggregator->is_active = aggregator->is_active; 2081 new_aggregator->num_of_ports = aggregator->num_of_ports; 2082 2083 /* update the information that is written on 2084 * the ports about the aggregator 2085 */ 2086 for (temp_port = aggregator->lag_ports; temp_port; 2087 temp_port = temp_port->next_port_in_aggregator) { 2088 temp_port->aggregator = new_aggregator; 2089 temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier; 2090 } 2091 2092 ad_clear_agg(aggregator); 2093 2094 if (select_new_active_agg) 2095 ad_agg_selection_logic(__get_first_agg(port), 2096 &dummy_slave_update); 2097 } else { 2098 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n"); 2099 } 2100 } else { 2101 /* in case that the only port related to this 2102 * aggregator is the one we want to remove 2103 */ 2104 select_new_active_agg = aggregator->is_active; 2105 ad_clear_agg(aggregator); 2106 if (select_new_active_agg) { 2107 netdev_info(bond->dev, "Removing an active aggregator\n"); 2108 /* select new active aggregator */ 2109 temp_aggregator = __get_first_agg(port); 2110 if (temp_aggregator) 2111 ad_agg_selection_logic(temp_aggregator, 2112 &dummy_slave_update); 2113 } 2114 } 2115 } 2116 2117 netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number); 2118 2119 /* find the aggregator that this port is connected to */ 2120 bond_for_each_slave(bond, slave_iter, iter) { 2121 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator); 2122 prev_port = NULL; 2123 /* search the port in the aggregator's related ports */ 2124 for (temp_port = temp_aggregator->lag_ports; temp_port; 2125 prev_port = temp_port, 2126 temp_port = temp_port->next_port_in_aggregator) { 2127 if (temp_port == port) { 2128 /* the aggregator found - detach the port from 2129 * this aggregator 2130 */ 2131 if (prev_port) 2132 prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator; 2133 else 2134 temp_aggregator->lag_ports = temp_port->next_port_in_aggregator; 2135 temp_aggregator->num_of_ports--; 2136 if (temp_aggregator->num_of_ports == 0) { 2137 select_new_active_agg = temp_aggregator->is_active; 2138 ad_clear_agg(temp_aggregator); 2139 if (select_new_active_agg) { 2140 netdev_info(bond->dev, "Removing an active aggregator\n"); 2141 /* select new active aggregator */ 2142 ad_agg_selection_logic(__get_first_agg(port), 2143 &dummy_slave_update); 2144 } 2145 } 2146 break; 2147 } 2148 } 2149 } 2150 port->slave = NULL; 2151 2152 out: 2153 spin_unlock_bh(&bond->mode_lock); 2154 } 2155 2156 /** 2157 * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports 2158 * @bond: bonding struct to work on 2159 * 2160 * If an ad_actor setting gets changed we need to update the individual port 2161 * settings so the bond device will use the new values when it gets upped. 2162 */ 2163 void bond_3ad_update_ad_actor_settings(struct bonding *bond) 2164 { 2165 struct list_head *iter; 2166 struct slave *slave; 2167 2168 ASSERT_RTNL(); 2169 2170 BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio; 2171 if (is_zero_ether_addr(bond->params.ad_actor_system)) 2172 BOND_AD_INFO(bond).system.sys_mac_addr = 2173 *((struct mac_addr *)bond->dev->dev_addr); 2174 else 2175 BOND_AD_INFO(bond).system.sys_mac_addr = 2176 *((struct mac_addr *)bond->params.ad_actor_system); 2177 2178 spin_lock_bh(&bond->mode_lock); 2179 bond_for_each_slave(bond, slave, iter) { 2180 struct port *port = &(SLAVE_AD_INFO(slave))->port; 2181 2182 __ad_actor_update_port(port); 2183 port->ntt = true; 2184 } 2185 spin_unlock_bh(&bond->mode_lock); 2186 } 2187 2188 /** 2189 * bond_3ad_state_machine_handler - handle state machines timeout 2190 * @bond: bonding struct to work on 2191 * 2192 * The state machine handling concept in this module is to check every tick 2193 * which state machine should operate any function. The execution order is 2194 * round robin, so when we have an interaction between state machines, the 2195 * reply of one to each other might be delayed until next tick. 2196 * 2197 * This function also complete the initialization when the agg_select_timer 2198 * times out, and it selects an aggregator for the ports that are yet not 2199 * related to any aggregator, and selects the active aggregator for a bond. 2200 */ 2201 void bond_3ad_state_machine_handler(struct work_struct *work) 2202 { 2203 struct bonding *bond = container_of(work, struct bonding, 2204 ad_work.work); 2205 struct aggregator *aggregator; 2206 struct list_head *iter; 2207 struct slave *slave; 2208 struct port *port; 2209 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 2210 bool update_slave_arr = false; 2211 2212 /* Lock to protect data accessed by all (e.g., port->sm_vars) and 2213 * against running with bond_3ad_unbind_slave. ad_rx_machine may run 2214 * concurrently due to incoming LACPDU as well. 2215 */ 2216 spin_lock_bh(&bond->mode_lock); 2217 rcu_read_lock(); 2218 2219 /* check if there are any slaves */ 2220 if (!bond_has_slaves(bond)) 2221 goto re_arm; 2222 2223 /* check if agg_select_timer timer after initialize is timed out */ 2224 if (BOND_AD_INFO(bond).agg_select_timer && 2225 !(--BOND_AD_INFO(bond).agg_select_timer)) { 2226 slave = bond_first_slave_rcu(bond); 2227 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL; 2228 2229 /* select the active aggregator for the bond */ 2230 if (port) { 2231 if (!port->slave) { 2232 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n", 2233 bond->dev->name); 2234 goto re_arm; 2235 } 2236 2237 aggregator = __get_first_agg(port); 2238 ad_agg_selection_logic(aggregator, &update_slave_arr); 2239 } 2240 bond_3ad_set_carrier(bond); 2241 } 2242 2243 /* for each port run the state machines */ 2244 bond_for_each_slave_rcu(bond, slave, iter) { 2245 port = &(SLAVE_AD_INFO(slave)->port); 2246 if (!port->slave) { 2247 net_warn_ratelimited("%s: Warning: Found an uninitialized port\n", 2248 bond->dev->name); 2249 goto re_arm; 2250 } 2251 2252 ad_rx_machine(NULL, port); 2253 ad_periodic_machine(port); 2254 ad_port_selection_logic(port, &update_slave_arr); 2255 ad_mux_machine(port, &update_slave_arr); 2256 ad_tx_machine(port); 2257 ad_churn_machine(port); 2258 2259 /* turn off the BEGIN bit, since we already handled it */ 2260 if (port->sm_vars & AD_PORT_BEGIN) 2261 port->sm_vars &= ~AD_PORT_BEGIN; 2262 } 2263 2264 re_arm: 2265 bond_for_each_slave_rcu(bond, slave, iter) { 2266 if (slave->should_notify) { 2267 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 2268 break; 2269 } 2270 } 2271 rcu_read_unlock(); 2272 spin_unlock_bh(&bond->mode_lock); 2273 2274 if (update_slave_arr) 2275 bond_slave_arr_work_rearm(bond, 0); 2276 2277 if (should_notify_rtnl && rtnl_trylock()) { 2278 bond_slave_state_notify(bond); 2279 rtnl_unlock(); 2280 } 2281 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks); 2282 } 2283 2284 /** 2285 * bond_3ad_rx_indication - handle a received frame 2286 * @lacpdu: received lacpdu 2287 * @slave: slave struct to work on 2288 * @length: length of the data received 2289 * 2290 * It is assumed that frames that were sent on this NIC don't returned as new 2291 * received frames (loopback). Since only the payload is given to this 2292 * function, it check for loopback. 2293 */ 2294 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, 2295 u16 length) 2296 { 2297 struct port *port; 2298 int ret = RX_HANDLER_ANOTHER; 2299 2300 if (length >= sizeof(struct lacpdu)) { 2301 2302 port = &(SLAVE_AD_INFO(slave)->port); 2303 2304 if (!port->slave) { 2305 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n", 2306 slave->dev->name, slave->bond->dev->name); 2307 return ret; 2308 } 2309 2310 switch (lacpdu->subtype) { 2311 case AD_TYPE_LACPDU: 2312 ret = RX_HANDLER_CONSUMED; 2313 netdev_dbg(slave->bond->dev, 2314 "Received LACPDU on port %d slave %s\n", 2315 port->actor_port_number, 2316 slave->dev->name); 2317 /* Protect against concurrent state machines */ 2318 spin_lock(&slave->bond->mode_lock); 2319 ad_rx_machine(lacpdu, port); 2320 spin_unlock(&slave->bond->mode_lock); 2321 break; 2322 2323 case AD_TYPE_MARKER: 2324 ret = RX_HANDLER_CONSUMED; 2325 /* No need to convert fields to Little Endian since we 2326 * don't use the marker's fields. 2327 */ 2328 2329 switch (((struct bond_marker *)lacpdu)->tlv_type) { 2330 case AD_MARKER_INFORMATION_SUBTYPE: 2331 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n", 2332 port->actor_port_number); 2333 ad_marker_info_received((struct bond_marker *)lacpdu, port); 2334 break; 2335 2336 case AD_MARKER_RESPONSE_SUBTYPE: 2337 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n", 2338 port->actor_port_number); 2339 ad_marker_response_received((struct bond_marker *)lacpdu, port); 2340 break; 2341 2342 default: 2343 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n", 2344 port->actor_port_number); 2345 } 2346 } 2347 } 2348 return ret; 2349 } 2350 2351 /** 2352 * ad_update_actor_keys - Update the oper / admin keys for a port based on 2353 * its current speed and duplex settings. 2354 * 2355 * @port: the port we'are looking at 2356 * @reset: Boolean to just reset the speed and the duplex part of the key 2357 * 2358 * The logic to change the oper / admin keys is: 2359 * (a) A full duplex port can participate in LACP with partner. 2360 * (b) When the speed is changed, LACP need to be reinitiated. 2361 */ 2362 static void ad_update_actor_keys(struct port *port, bool reset) 2363 { 2364 u8 duplex = 0; 2365 u16 ospeed = 0, speed = 0; 2366 u16 old_oper_key = port->actor_oper_port_key; 2367 2368 port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS); 2369 if (!reset) { 2370 speed = __get_link_speed(port); 2371 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1; 2372 duplex = __get_duplex(port); 2373 port->actor_admin_port_key |= (speed << 1) | duplex; 2374 } 2375 port->actor_oper_port_key = port->actor_admin_port_key; 2376 2377 if (old_oper_key != port->actor_oper_port_key) { 2378 /* Only 'duplex' port participates in LACP */ 2379 if (duplex) 2380 port->sm_vars |= AD_PORT_LACP_ENABLED; 2381 else 2382 port->sm_vars &= ~AD_PORT_LACP_ENABLED; 2383 2384 if (!reset) { 2385 if (!speed) { 2386 netdev_err(port->slave->dev, 2387 "speed changed to 0 for port %s", 2388 port->slave->dev->name); 2389 } else if (duplex && ospeed != speed) { 2390 /* Speed change restarts LACP state-machine */ 2391 port->sm_vars |= AD_PORT_BEGIN; 2392 } 2393 } 2394 } 2395 } 2396 2397 /** 2398 * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex 2399 * change indication 2400 * 2401 * @slave: slave struct to work on 2402 * 2403 * Handle reselection of aggregator (if needed) for this port. 2404 */ 2405 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave) 2406 { 2407 struct port *port; 2408 2409 port = &(SLAVE_AD_INFO(slave)->port); 2410 2411 /* if slave is null, the whole port is not initialized */ 2412 if (!port->slave) { 2413 netdev_warn(slave->bond->dev, 2414 "speed/duplex changed for uninitialized port %s\n", 2415 slave->dev->name); 2416 return; 2417 } 2418 2419 spin_lock_bh(&slave->bond->mode_lock); 2420 ad_update_actor_keys(port, false); 2421 netdev_dbg(slave->bond->dev, "Port %d slave %s changed speed/duplex\n", 2422 port->actor_port_number, slave->dev->name); 2423 spin_unlock_bh(&slave->bond->mode_lock); 2424 } 2425 2426 /** 2427 * bond_3ad_handle_link_change - handle a slave's link status change indication 2428 * @slave: slave struct to work on 2429 * @status: whether the link is now up or down 2430 * 2431 * Handle reselection of aggregator (if needed) for this port. 2432 */ 2433 void bond_3ad_handle_link_change(struct slave *slave, char link) 2434 { 2435 struct port *port; 2436 2437 port = &(SLAVE_AD_INFO(slave)->port); 2438 2439 /* if slave is null, the whole port is not initialized */ 2440 if (!port->slave) { 2441 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n", 2442 slave->dev->name); 2443 return; 2444 } 2445 2446 spin_lock_bh(&slave->bond->mode_lock); 2447 /* on link down we are zeroing duplex and speed since 2448 * some of the adaptors(ce1000.lan) report full duplex/speed 2449 * instead of N/A(duplex) / 0(speed). 2450 * 2451 * on link up we are forcing recheck on the duplex and speed since 2452 * some of he adaptors(ce1000.lan) report. 2453 */ 2454 if (link == BOND_LINK_UP) { 2455 port->is_enabled = true; 2456 ad_update_actor_keys(port, false); 2457 } else { 2458 /* link has failed */ 2459 port->is_enabled = false; 2460 ad_update_actor_keys(port, true); 2461 } 2462 netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n", 2463 port->actor_port_number, 2464 link == BOND_LINK_UP ? "UP" : "DOWN"); 2465 2466 spin_unlock_bh(&slave->bond->mode_lock); 2467 2468 /* RTNL is held and mode_lock is released so it's safe 2469 * to update slave_array here. 2470 */ 2471 bond_update_slave_arr(slave->bond, NULL); 2472 } 2473 2474 /** 2475 * bond_3ad_set_carrier - set link state for bonding master 2476 * @bond - bonding structure 2477 * 2478 * if we have an active aggregator, we're up, if not, we're down. 2479 * Presumes that we cannot have an active aggregator if there are 2480 * no slaves with link up. 2481 * 2482 * This behavior complies with IEEE 802.3 section 43.3.9. 2483 * 2484 * Called by bond_set_carrier(). Return zero if carrier state does not 2485 * change, nonzero if it does. 2486 */ 2487 int bond_3ad_set_carrier(struct bonding *bond) 2488 { 2489 struct aggregator *active; 2490 struct slave *first_slave; 2491 int ret = 1; 2492 2493 rcu_read_lock(); 2494 first_slave = bond_first_slave_rcu(bond); 2495 if (!first_slave) { 2496 ret = 0; 2497 goto out; 2498 } 2499 active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator)); 2500 if (active) { 2501 /* are enough slaves available to consider link up? */ 2502 if (active->num_of_ports < bond->params.min_links) { 2503 if (netif_carrier_ok(bond->dev)) { 2504 netif_carrier_off(bond->dev); 2505 goto out; 2506 } 2507 } else if (!netif_carrier_ok(bond->dev)) { 2508 netif_carrier_on(bond->dev); 2509 goto out; 2510 } 2511 } else if (netif_carrier_ok(bond->dev)) { 2512 netif_carrier_off(bond->dev); 2513 } 2514 out: 2515 rcu_read_unlock(); 2516 return ret; 2517 } 2518 2519 /** 2520 * __bond_3ad_get_active_agg_info - get information of the active aggregator 2521 * @bond: bonding struct to work on 2522 * @ad_info: ad_info struct to fill with the bond's info 2523 * 2524 * Returns: 0 on success 2525 * < 0 on error 2526 */ 2527 int __bond_3ad_get_active_agg_info(struct bonding *bond, 2528 struct ad_info *ad_info) 2529 { 2530 struct aggregator *aggregator = NULL; 2531 struct list_head *iter; 2532 struct slave *slave; 2533 struct port *port; 2534 2535 bond_for_each_slave_rcu(bond, slave, iter) { 2536 port = &(SLAVE_AD_INFO(slave)->port); 2537 if (port->aggregator && port->aggregator->is_active) { 2538 aggregator = port->aggregator; 2539 break; 2540 } 2541 } 2542 2543 if (!aggregator) 2544 return -1; 2545 2546 ad_info->aggregator_id = aggregator->aggregator_identifier; 2547 ad_info->ports = aggregator->num_of_ports; 2548 ad_info->actor_key = aggregator->actor_oper_aggregator_key; 2549 ad_info->partner_key = aggregator->partner_oper_aggregator_key; 2550 ether_addr_copy(ad_info->partner_system, 2551 aggregator->partner_system.mac_addr_value); 2552 return 0; 2553 } 2554 2555 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info) 2556 { 2557 int ret; 2558 2559 rcu_read_lock(); 2560 ret = __bond_3ad_get_active_agg_info(bond, ad_info); 2561 rcu_read_unlock(); 2562 2563 return ret; 2564 } 2565 2566 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond, 2567 struct slave *slave) 2568 { 2569 struct lacpdu *lacpdu, _lacpdu; 2570 2571 if (skb->protocol != PKT_TYPE_LACPDU) 2572 return RX_HANDLER_ANOTHER; 2573 2574 if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr)) 2575 return RX_HANDLER_ANOTHER; 2576 2577 lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu); 2578 if (!lacpdu) 2579 return RX_HANDLER_ANOTHER; 2580 2581 return bond_3ad_rx_indication(lacpdu, slave, skb->len); 2582 } 2583 2584 /** 2585 * bond_3ad_update_lacp_rate - change the lacp rate 2586 * @bond - bonding struct 2587 * 2588 * When modify lacp_rate parameter via sysfs, 2589 * update actor_oper_port_state of each port. 2590 * 2591 * Hold bond->mode_lock, 2592 * so we can modify port->actor_oper_port_state, 2593 * no matter bond is up or down. 2594 */ 2595 void bond_3ad_update_lacp_rate(struct bonding *bond) 2596 { 2597 struct port *port = NULL; 2598 struct list_head *iter; 2599 struct slave *slave; 2600 int lacp_fast; 2601 2602 lacp_fast = bond->params.lacp_fast; 2603 spin_lock_bh(&bond->mode_lock); 2604 bond_for_each_slave(bond, slave, iter) { 2605 port = &(SLAVE_AD_INFO(slave)->port); 2606 if (lacp_fast) 2607 port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT; 2608 else 2609 port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT; 2610 } 2611 spin_unlock_bh(&bond->mode_lock); 2612 } 2613