drivers/net/bonding/bond_3ad.c

   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 "bonding.h"
  33 #include "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 802.3ad standard)
  61 #define AD_PORT_BEGIN           0x1
  62 #define AD_PORT_LACP_ENABLED    0x2
  63 #define AD_PORT_ACTOR_CHURN     0x4
  64 #define AD_PORT_PARTNER_CHURN   0x8
  65 #define AD_PORT_READY           0x10
  66 #define AD_PORT_READY_N         0x20
  67 #define AD_PORT_MATCHED         0x40
  68 #define AD_PORT_STANDBY         0x80
  69 #define AD_PORT_SELECTED        0x100
  70 #define AD_PORT_MOVED           0x200
  71
  72 // Port Key definitions
  73 // key is determined according to the link speed, duplex and
  74 // user key(which is yet not supported)
  75 //              ------------------------------------------------------------
  76 // Port key :   | User key                       |      Speed       |Duplex|
  77 //              ------------------------------------------------------------
  78 //              16                               6               1 0
  79 #define  AD_DUPLEX_KEY_BITS    0x1
  80 #define  AD_SPEED_KEY_BITS     0x3E
  81 #define  AD_USER_KEY_BITS      0xFFC0
  82
  83 //dalloun
  84 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  85 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  86 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  87 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  88 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  89 //endalloun
  90
  91 // compare MAC addresses
  92 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  93
  94 static struct mac_addr null_mac_addr = {{0, 0, 0, 0, 0, 0}};
  95 static u16 ad_ticks_per_sec;
  96 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  97
  98 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
  99
 100 // ================= main 802.3ad protocol functions ==================
 101 static int ad_lacpdu_send(struct port *port);
 102 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 103 static void ad_mux_machine(struct port *port);
 104 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 105 static void ad_tx_machine(struct port *port);
 106 static void ad_periodic_machine(struct port *port);
 107 static void ad_port_selection_logic(struct port *port);
 108 static void ad_agg_selection_logic(struct aggregator *aggregator);
 109 static void ad_clear_agg(struct aggregator *aggregator);
 110 static void ad_initialize_agg(struct aggregator *aggregator);
 111 static void ad_initialize_port(struct port *port, int lacp_fast);
 112 static void ad_enable_collecting_distributing(struct port *port);
 113 static void ad_disable_collecting_distributing(struct port *port);
 114 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 115 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 116
 117
 118 /////////////////////////////////////////////////////////////////////////////////
 119 // ================= api to bonding and kernel code ==================
 120 /////////////////////////////////////////////////////////////////////////////////
 121
 122 /**
 123  * __get_bond_by_port - get the port's bonding struct
 124  * @port: the port we're looking at
 125  *
 126  * Return @port's bonding struct, or %NULL if it can't be found.
 127  */
 128 static inline struct bonding *__get_bond_by_port(struct port *port)
 129 {
 130         if (port->slave == NULL) {
 131                 return NULL;
 132         }
 133
 134         return bond_get_bond_by_slave(port->slave);
 135 }
 136
 137 /**
 138  * __get_first_port - get the first port in the bond
 139  * @bond: the bond we're looking at
 140  *
 141  * Return the port of the first slave in @bond, or %NULL if it can't be found.
 142  */
 143 static inline struct port *__get_first_port(struct bonding *bond)
 144 {
 145         if (bond->slave_cnt == 0) {
 146                 return NULL;
 147         }
 148
 149         return &(SLAVE_AD_INFO(bond->first_slave).port);
 150 }
 151
 152 /**
 153  * __get_next_port - get the next port in the bond
 154  * @port: the port we're looking at
 155  *
 156  * Return the port of the slave that is next in line of @port's slave in the
 157  * bond, or %NULL if it can't be found.
 158  */
 159 static inline struct port *__get_next_port(struct port *port)
 160 {
 161         struct bonding *bond = __get_bond_by_port(port);
 162         struct slave *slave = port->slave;
 163
 164         // If there's no bond for this port, or this is the last slave
 165         if ((bond == NULL) || (slave->next == bond->first_slave)) {
 166                 return NULL;
 167         }
 168
 169         return &(SLAVE_AD_INFO(slave->next).port);
 170 }
 171
 172 /**
 173  * __get_first_agg - get the first aggregator in the bond
 174  * @bond: the bond we're looking at
 175  *
 176  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 177  * found.
 178  */
 179 static inline struct aggregator *__get_first_agg(struct port *port)
 180 {
 181         struct bonding *bond = __get_bond_by_port(port);
 182
 183         // If there's no bond for this port, or bond has no slaves
 184         if ((bond == NULL) || (bond->slave_cnt == 0)) {
 185                 return NULL;
 186         }
 187
 188         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
 189 }
 190
 191 /**
 192  * __get_next_agg - get the next aggregator in the bond
 193  * @aggregator: the aggregator we're looking at
 194  *
 195  * Return the aggregator of the slave that is next in line of @aggregator's
 196  * slave in the bond, or %NULL if it can't be found.
 197  */
 198 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
 199 {
 200         struct slave *slave = aggregator->slave;
 201         struct bonding *bond = bond_get_bond_by_slave(slave);
 202
 203         // If there's no bond for this aggregator, or this is the last slave
 204         if ((bond == NULL) || (slave->next == bond->first_slave)) {
 205                 return NULL;
 206         }
 207
 208         return &(SLAVE_AD_INFO(slave->next).aggregator);
 209 }
 210
 211 /*
 212  * __agg_has_partner
 213  *
 214  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 215  * address for the partner).  Return 0 if not.
 216  */
 217 static inline int __agg_has_partner(struct aggregator *agg)
 218 {
 219         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 220 }
 221
 222 /**
 223  * __disable_port - disable the port's slave
 224  * @port: the port we're looking at
 225  *
 226  */
 227 static inline void __disable_port(struct port *port)
 228 {
 229         bond_set_slave_inactive_flags(port->slave);
 230 }
 231
 232 /**
 233  * __enable_port - enable the port's slave, if it's up
 234  * @port: the port we're looking at
 235  *
 236  */
 237 static inline void __enable_port(struct port *port)
 238 {
 239         struct slave *slave = port->slave;
 240
 241         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev)) {
 242                 bond_set_slave_active_flags(slave);
 243         }
 244 }
 245
 246 /**
 247  * __port_is_enabled - check if the port's slave is in active state
 248  * @port: the port we're looking at
 249  *
 250  */
 251 static inline int __port_is_enabled(struct port *port)
 252 {
 253         return(port->slave->state == BOND_STATE_ACTIVE);
 254 }
 255
 256 /**
 257  * __get_agg_selection_mode - get the aggregator selection mode
 258  * @port: the port we're looking at
 259  *
 260  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 261  */
 262 static inline u32 __get_agg_selection_mode(struct port *port)
 263 {
 264         struct bonding *bond = __get_bond_by_port(port);
 265
 266         if (bond == NULL) {
 267                 return BOND_AD_STABLE;
 268         }
 269
 270         return BOND_AD_INFO(bond).agg_select_mode;
 271 }
 272
 273 /**
 274  * __check_agg_selection_timer - check if the selection timer has expired
 275  * @port: the port we're looking at
 276  *
 277  */
 278 static inline int __check_agg_selection_timer(struct port *port)
 279 {
 280         struct bonding *bond = __get_bond_by_port(port);
 281
 282         if (bond == NULL) {
 283                 return 0;
 284         }
 285
 286         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 287 }
 288
 289 /**
 290  * __get_rx_machine_lock - lock the port's RX machine
 291  * @port: the port we're looking at
 292  *
 293  */
 294 static inline void __get_rx_machine_lock(struct port *port)
 295 {
 296         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 297 }
 298
 299 /**
 300  * __release_rx_machine_lock - unlock the port's RX machine
 301  * @port: the port we're looking at
 302  *
 303  */
 304 static inline void __release_rx_machine_lock(struct port *port)
 305 {
 306         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 307 }
 308
 309 /**
 310  * __get_link_speed - get a port's speed
 311  * @port: the port we're looking at
 312  *
 313  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 314  *     0,
 315  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 316  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 317  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 318  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 319  */
 320 static u16 __get_link_speed(struct port *port)
 321 {
 322         struct slave *slave = port->slave;
 323         u16 speed;
 324
 325         /* this if covers only a special case: when the configuration starts with
 326          * link down, it sets the speed to 0.
 327          * This is done in spite of the fact that the e100 driver reports 0 to be
 328          * compatible with MVT in the future.*/
 329         if (slave->link != BOND_LINK_UP) {
 330                 speed=0;
 331         } else {
 332                 switch (slave->speed) {
 333                 case SPEED_10:
 334                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 335                         break;
 336
 337                 case SPEED_100:
 338                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 339                         break;
 340
 341                 case SPEED_1000:
 342                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 343                         break;
 344
 345                 case SPEED_10000:
 346                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 347                         break;
 348
 349                 default:
 350                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 351                         break;
 352                 }
 353         }
 354
 355         pr_debug("Port %d Received link speed %d update from adapter\n", port->actor_port_number, speed);
 356         return speed;
 357 }
 358
 359 /**
 360  * __get_duplex - get a port's duplex
 361  * @port: the port we're looking at
 362  *
 363  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 364  *     0x01 if in full duplex
 365  *     0x00 otherwise
 366  */
 367 static u8 __get_duplex(struct port *port)
 368 {
 369         struct slave *slave = port->slave;
 370
 371         u8 retval;
 372
 373         //  handling a special case: when the configuration starts with
 374         // link down, it sets the duplex to 0.
 375         if (slave->link != BOND_LINK_UP) {
 376                 retval=0x0;
 377         } else {
 378                 switch (slave->duplex) {
 379                 case DUPLEX_FULL:
 380                         retval=0x1;
 381                         pr_debug("Port %d Received status full duplex update from adapter\n", port->actor_port_number);
 382                         break;
 383                 case DUPLEX_HALF:
 384                 default:
 385                         retval=0x0;
 386                         pr_debug("Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number);
 387                         break;
 388                 }
 389         }
 390         return retval;
 391 }
 392
 393 /**
 394  * __initialize_port_locks - initialize a port's RX machine spinlock
 395  * @port: the port we're looking at
 396  *
 397  */
 398 static inline void __initialize_port_locks(struct port *port)
 399 {
 400         // make sure it isn't called twice
 401         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 402 }
 403
 404 //conversions
 405
 406 /**
 407  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 408  * @timer_type: which timer to operate
 409  * @par: timer parameter. see below
 410  *
 411  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 412  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 413  *                                                  %SLOW_PERIODIC_TIME.
 414  */
 415 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 416 {
 417         u16 retval=0;    //to silence the compiler
 418
 419         switch (timer_type) {
 420         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 421                 if (par) {            // for short or long timeout
 422                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 423                 } else {
 424                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 425                 }
 426                 break;
 427         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 428                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 429                 break;
 430         case AD_PERIODIC_TIMER:     // for periodic machine
 431                 retval = (par*ad_ticks_per_sec); // long timeout
 432                 break;
 433         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 434                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 435                 break;
 436         case AD_WAIT_WHILE_TIMER:           // for selection machine
 437                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 438                 break;
 439         }
 440         return retval;
 441 }
 442
 443
 444 /////////////////////////////////////////////////////////////////////////////////
 445 // ================= ad_rx_machine helper functions ==================
 446 /////////////////////////////////////////////////////////////////////////////////
 447
 448 /**
 449  * __record_pdu - record parameters from a received lacpdu
 450  * @lacpdu: the lacpdu we've received
 451  * @port: the port we're looking at
 452  *
 453  * Record the parameter values for the Actor carried in a received lacpdu as
 454  * the current partner operational parameter values and sets
 455  * actor_oper_port_state.defaulted to FALSE.
 456  */
 457 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 458 {
 459         if (lacpdu && port) {
 460                 struct port_params *partner = &port->partner_oper;
 461
 462                 // record the new parameter values for the partner operational
 463                 partner->port_number = ntohs(lacpdu->actor_port);
 464                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 465                 partner->system = lacpdu->actor_system;
 466                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 467                 partner->key = ntohs(lacpdu->actor_key);
 468                 partner->port_state = lacpdu->actor_state;
 469
 470                 // set actor_oper_port_state.defaulted to FALSE
 471                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 472
 473                 // set the partner sync. to on if the partner is sync. and the port is matched
 474                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 475                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 476                 } else {
 477                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 478                 }
 479         }
 480 }
 481
 482 /**
 483  * __record_default - record default parameters
 484  * @port: the port we're looking at
 485  *
 486  * This function records the default parameter values for the partner carried
 487  * in the Partner Admin parameters as the current partner operational parameter
 488  * values and sets actor_oper_port_state.defaulted to TRUE.
 489  */
 490 static void __record_default(struct port *port)
 491 {
 492         if (port) {
 493                 // record the partner admin parameters
 494                 memcpy(&port->partner_oper, &port->partner_admin,
 495                        sizeof(struct port_params));
 496
 497                 // set actor_oper_port_state.defaulted to true
 498                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 499         }
 500 }
 501
 502 /**
 503  * __update_selected - update a port's Selected variable from a received lacpdu
 504  * @lacpdu: the lacpdu we've received
 505  * @port: the port we're looking at
 506  *
 507  * Update the value of the selected variable, using parameter values from a
 508  * newly received lacpdu. The parameter values for the Actor carried in the
 509  * received PDU are compared with the corresponding operational parameter
 510  * values for the ports partner. If one or more of the comparisons shows that
 511  * the value(s) received in the PDU differ from the current operational values,
 512  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 513  * set to out_of_sync. Otherwise, selected remains unchanged.
 514  */
 515 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 516 {
 517         if (lacpdu && port) {
 518                 const struct port_params *partner = &port->partner_oper;
 519
 520                 // check if any parameter is different
 521                 if (ntohs(lacpdu->actor_port) != partner->port_number
 522                     || ntohs(lacpdu->actor_port_priority) != partner->port_priority
 523                     || MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system)
 524                     || ntohs(lacpdu->actor_system_priority) != partner->system_priority
 525                     || ntohs(lacpdu->actor_key) != partner->key
 526                     || (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 527                         // update the state machine Selected variable
 528                         port->sm_vars &= ~AD_PORT_SELECTED;
 529                 }
 530         }
 531 }
 532
 533 /**
 534  * __update_default_selected - update a port's Selected variable from Partner
 535  * @port: the port we're looking at
 536  *
 537  * This function updates the value of the selected variable, using the partner
 538  * administrative parameter values. The administrative values are compared with
 539  * the corresponding operational parameter values for the partner. If one or
 540  * more of the comparisons shows that the administrative value(s) differ from
 541  * the current operational values, then Selected is set to FALSE and
 542  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 543  * Selected remains unchanged.
 544  */
 545 static void __update_default_selected(struct port *port)
 546 {
 547         if (port) {
 548                 const struct port_params *admin = &port->partner_admin;
 549                 const struct port_params *oper = &port->partner_oper;
 550
 551                 // check if any parameter is different
 552                 if (admin->port_number != oper->port_number
 553                     || admin->port_priority != oper->port_priority
 554                     || MAC_ADDRESS_COMPARE(&admin->system, &oper->system)
 555                     || admin->system_priority != oper->system_priority
 556                     || admin->key != oper->key
 557                     || (admin->port_state & AD_STATE_AGGREGATION)
 558                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 559                         // update the state machine Selected variable
 560                         port->sm_vars &= ~AD_PORT_SELECTED;
 561                 }
 562         }
 563 }
 564
 565 /**
 566  * __choose_matched - update a port's matched variable from a received lacpdu
 567  * @lacpdu: the lacpdu we've received
 568  * @port: the port we're looking at
 569  *
 570  * Update the value of the matched variable, using parameter values from a
 571  * newly received lacpdu. Parameter values for the partner carried in the
 572  * received PDU are compared with the corresponding operational parameter
 573  * values for the actor. Matched is set to TRUE if all of these parameters
 574  * match and the PDU parameter partner_state.aggregation has the same value as
 575  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 576  * in the aggregation. Matched is also set to TRUE if the value of
 577  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 578  * an individual link and lacp will actively maintain the link. Otherwise,
 579  * matched is set to FALSE. LACP is considered to be actively maintaining the
 580  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 581  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 582  * partner_state.lacp_activity variables are TRUE.
 583  */
 584 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 585 {
 586         // validate lacpdu and port
 587         if (lacpdu && port) {
 588                 // check if all parameters are alike
 589                 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 590                      (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 591                      !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 592                      (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 593                      (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 594                      ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 595                     // or this is individual link(aggregation == FALSE)
 596                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 597                    ) {
 598                         // update the state machine Matched variable
 599                         port->sm_vars |= AD_PORT_MATCHED;
 600                 } else {
 601                         port->sm_vars &= ~AD_PORT_MATCHED;
 602                 }
 603         }
 604 }
 605
 606 /**
 607  * __update_ntt - update a port's ntt variable from a received lacpdu
 608  * @lacpdu: the lacpdu we've received
 609  * @port: the port we're looking at
 610  *
 611  * Updates the value of the ntt variable, using parameter values from a newly
 612  * received lacpdu. The parameter values for the partner carried in the
 613  * received PDU are compared with the corresponding operational parameter
 614  * values for the Actor. If one or more of the comparisons shows that the
 615  * value(s) received in the PDU differ from the current operational values,
 616  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 617  */
 618 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 619 {
 620         // validate lacpdu and port
 621         if (lacpdu && port) {
 622                 // check if any parameter is different
 623                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 624                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 625                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 626                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 627                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 628                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 629                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 630                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 631                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 632                    ) {
 633
 634                         port->ntt = true;
 635                 }
 636         }
 637 }
 638
 639 /**
 640  * __attach_bond_to_agg
 641  * @port: the port we're looking at
 642  *
 643  * Handle the attaching of the port's control parser/multiplexer and the
 644  * aggregator. This function does nothing since the parser/multiplexer of the
 645  * receive and the parser/multiplexer of the aggregator are already combined.
 646  */
 647 static void __attach_bond_to_agg(struct port *port)
 648 {
 649         port=NULL; // just to satisfy the compiler
 650         // This function does nothing since the parser/multiplexer of the receive
 651         // and the parser/multiplexer of the aggregator are already combined
 652 }
 653
 654 /**
 655  * __detach_bond_from_agg
 656  * @port: the port we're looking at
 657  *
 658  * Handle the detaching of the port's control parser/multiplexer from the
 659  * aggregator. This function does nothing since the parser/multiplexer of the
 660  * receive and the parser/multiplexer of the aggregator are already combined.
 661  */
 662 static void __detach_bond_from_agg(struct port *port)
 663 {
 664         port=NULL; // just to satisfy the compiler
 665         // This function does nothing sience the parser/multiplexer of the receive
 666         // and the parser/multiplexer of the aggregator are already combined
 667 }
 668
 669 /**
 670  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 671  * @aggregator: the aggregator we're looking at
 672  *
 673  */
 674 static int __agg_ports_are_ready(struct aggregator *aggregator)
 675 {
 676         struct port *port;
 677         int retval = 1;
 678
 679         if (aggregator) {
 680                 // scan all ports in this aggregator to verfy if they are all ready
 681                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 682                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 683                                 retval = 0;
 684                                 break;
 685                         }
 686                 }
 687         }
 688
 689         return retval;
 690 }
 691
 692 /**
 693  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 694  * @aggregator: the aggregator we're looking at
 695  * @val: Should the ports' ready bit be set on or off
 696  *
 697  */
 698 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 699 {
 700         struct port *port;
 701
 702         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 703                 if (val) {
 704                         port->sm_vars |= AD_PORT_READY;
 705                 } else {
 706                         port->sm_vars &= ~AD_PORT_READY;
 707                 }
 708         }
 709 }
 710
 711 /**
 712  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 713  * @aggregator: the aggregator we're looking at
 714  *
 715  */
 716 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 717 {
 718         u32 bandwidth=0;
 719         u32 basic_speed;
 720
 721         if (aggregator->num_of_ports) {
 722                 basic_speed = __get_link_speed(aggregator->lag_ports);
 723                 switch (basic_speed) {
 724                 case AD_LINK_SPEED_BITMASK_1MBPS:
 725                         bandwidth = aggregator->num_of_ports;
 726                         break;
 727                 case AD_LINK_SPEED_BITMASK_10MBPS:
 728                         bandwidth = aggregator->num_of_ports * 10;
 729                         break;
 730                 case AD_LINK_SPEED_BITMASK_100MBPS:
 731                         bandwidth = aggregator->num_of_ports * 100;
 732                         break;
 733                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 734                         bandwidth = aggregator->num_of_ports * 1000;
 735                         break;
 736                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 737                         bandwidth = aggregator->num_of_ports * 10000;
 738                         break;
 739                 default:
 740                         bandwidth=0; // to silent the compilor ....
 741                 }
 742         }
 743         return bandwidth;
 744 }
 745
 746 /**
 747  * __get_active_agg - get the current active aggregator
 748  * @aggregator: the aggregator we're looking at
 749  *
 750  */
 751 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 752 {
 753         struct aggregator *retval = NULL;
 754
 755         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 756                 if (aggregator->is_active) {
 757                         retval = aggregator;
 758                         break;
 759                 }
 760         }
 761
 762         return retval;
 763 }
 764
 765 /**
 766  * __update_lacpdu_from_port - update a port's lacpdu fields
 767  * @port: the port we're looking at
 768  *
 769  */
 770 static inline void __update_lacpdu_from_port(struct port *port)
 771 {
 772         struct lacpdu *lacpdu = &port->lacpdu;
 773         const struct port_params *partner = &port->partner_oper;
 774
 775         /* update current actual Actor parameters */
 776         /* lacpdu->subtype                   initialized
 777          * lacpdu->version_number            initialized
 778          * lacpdu->tlv_type_actor_info       initialized
 779          * lacpdu->actor_information_length  initialized
 780          */
 781
 782         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 783         lacpdu->actor_system = port->actor_system;
 784         lacpdu->actor_key = htons(port->actor_oper_port_key);
 785         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 786         lacpdu->actor_port = htons(port->actor_port_number);
 787         lacpdu->actor_state = port->actor_oper_port_state;
 788
 789         /* lacpdu->reserved_3_1              initialized
 790          * lacpdu->tlv_type_partner_info     initialized
 791          * lacpdu->partner_information_length initialized
 792          */
 793
 794         lacpdu->partner_system_priority = htons(partner->system_priority);
 795         lacpdu->partner_system = partner->system;
 796         lacpdu->partner_key = htons(partner->key);
 797         lacpdu->partner_port_priority = htons(partner->port_priority);
 798         lacpdu->partner_port = htons(partner->port_number);
 799         lacpdu->partner_state = partner->port_state;
 800
 801         /* lacpdu->reserved_3_2              initialized
 802          * lacpdu->tlv_type_collector_info   initialized
 803          * lacpdu->collector_information_length initialized
 804          * collector_max_delay                initialized
 805          * reserved_12[12]                   initialized
 806          * tlv_type_terminator               initialized
 807          * terminator_length                 initialized
 808          * reserved_50[50]                   initialized
 809          */
 810 }
 811
 812 //////////////////////////////////////////////////////////////////////////////////////
 813 // ================= main 802.3ad protocol code ======================================
 814 //////////////////////////////////////////////////////////////////////////////////////
 815
 816 /**
 817  * ad_lacpdu_send - send out a lacpdu packet on a given port
 818  * @port: the port we're looking at
 819  *
 820  * Returns:   0 on success
 821  *          < 0 on error
 822  */
 823 static int ad_lacpdu_send(struct port *port)
 824 {
 825         struct slave *slave = port->slave;
 826         struct sk_buff *skb;
 827         struct lacpdu_header *lacpdu_header;
 828         int length = sizeof(struct lacpdu_header);
 829
 830         skb = dev_alloc_skb(length);
 831         if (!skb) {
 832                 return -ENOMEM;
 833         }
 834
 835         skb->dev = slave->dev;
 836         skb_reset_mac_header(skb);
 837         skb->network_header = skb->mac_header + ETH_HLEN;
 838         skb->protocol = PKT_TYPE_LACPDU;
 839         skb->priority = TC_PRIO_CONTROL;
 840
 841         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 842
 843         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 844         /* Note: source addres is set to be the member's PERMANENT address,
 845            because we use it to identify loopback lacpdus in receive. */
 846         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 847         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 848
 849         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 850
 851         dev_queue_xmit(skb);
 852
 853         return 0;
 854 }
 855
 856 /**
 857  * ad_marker_send - send marker information/response on a given port
 858  * @port: the port we're looking at
 859  * @marker: marker data to send
 860  *
 861  * Returns:   0 on success
 862  *          < 0 on error
 863  */
 864 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 865 {
 866         struct slave *slave = port->slave;
 867         struct sk_buff *skb;
 868         struct bond_marker_header *marker_header;
 869         int length = sizeof(struct bond_marker_header);
 870
 871         skb = dev_alloc_skb(length + 16);
 872         if (!skb) {
 873                 return -ENOMEM;
 874         }
 875
 876         skb_reserve(skb, 16);
 877
 878         skb->dev = slave->dev;
 879         skb_reset_mac_header(skb);
 880         skb->network_header = skb->mac_header + ETH_HLEN;
 881         skb->protocol = PKT_TYPE_LACPDU;
 882
 883         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 884
 885         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 886         /* Note: source addres is set to be the member's PERMANENT address,
 887            because we use it to identify loopback MARKERs in receive. */
 888         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 889         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 890
 891         marker_header->marker = *marker; // struct copy
 892
 893         dev_queue_xmit(skb);
 894
 895         return 0;
 896 }
 897
 898 /**
 899  * ad_mux_machine - handle a port's mux state machine
 900  * @port: the port we're looking at
 901  *
 902  */
 903 static void ad_mux_machine(struct port *port)
 904 {
 905         mux_states_t last_state;
 906
 907         // keep current State Machine state to compare later if it was changed
 908         last_state = port->sm_mux_state;
 909
 910         if (port->sm_vars & AD_PORT_BEGIN) {
 911                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 912         } else {
 913                 switch (port->sm_mux_state) {
 914                 case AD_MUX_DETACHED:
 915                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
 916                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 917                         }
 918                         break;
 919                 case AD_MUX_WAITING:
 920                         // if SELECTED == FALSE return to DETACH state
 921                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 922                                 port->sm_vars &= ~AD_PORT_READY_N;
 923                                 // in order to withhold the Selection Logic to check all ports READY_N value
 924                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 925                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 926                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 927                                 break;
 928                         }
 929
 930                         // check if the wait_while_timer expired
 931                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
 932                                 port->sm_vars |= AD_PORT_READY_N;
 933                         }
 934
 935                         // in order to withhold the selection logic to check all ports READY_N value
 936                         // every callback cycle to update ready variable, we check READY_N and update READY here
 937                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 938
 939                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 940                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
 941                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 942                         }
 943                         break;
 944                 case AD_MUX_ATTACHED:
 945                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 946                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 947                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 948                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 949                                 port->sm_vars &= ~AD_PORT_READY_N;
 950                                 // in order to withhold the selection logic to check all ports READY_N value
 951                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 952                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 953                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 954                         }
 955                         break;
 956                 case AD_MUX_COLLECTING_DISTRIBUTING:
 957                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 958                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 959                            ) {
 960                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 961
 962                         } else {
 963                                 // if port state hasn't changed make
 964                                 // sure that a collecting distributing
 965                                 // port in an active aggregator is enabled
 966                                 if (port->aggregator &&
 967                                     port->aggregator->is_active &&
 968                                     !__port_is_enabled(port)) {
 969
 970                                         __enable_port(port);
 971                                 }
 972                         }
 973                         break;
 974                 default:    //to silence the compiler
 975                         break;
 976                 }
 977         }
 978
 979         // check if the state machine was changed
 980         if (port->sm_mux_state != last_state) {
 981                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
 982                 switch (port->sm_mux_state) {
 983                 case AD_MUX_DETACHED:
 984                         __detach_bond_from_agg(port);
 985                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 986                         ad_disable_collecting_distributing(port);
 987                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 988                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 989                         port->ntt = true;
 990                         break;
 991                 case AD_MUX_WAITING:
 992                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 993                         break;
 994                 case AD_MUX_ATTACHED:
 995                         __attach_bond_to_agg(port);
 996                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 997                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 998                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 999                         ad_disable_collecting_distributing(port);
1000                         port->ntt = true;
1001                         break;
1002                 case AD_MUX_COLLECTING_DISTRIBUTING:
1003                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1004                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1005                         ad_enable_collecting_distributing(port);
1006                         port->ntt = true;
1007                         break;
1008                 default:    //to silence the compiler
1009                         break;
1010                 }
1011         }
1012 }
1013
1014 /**
1015  * ad_rx_machine - handle a port's rx State Machine
1016  * @lacpdu: the lacpdu we've received
1017  * @port: the port we're looking at
1018  *
1019  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1020  * CURRENT. If timer expired set the state machine in the proper state.
1021  * In other cases, this function checks if we need to switch to other state.
1022  */
1023 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1024 {
1025         rx_states_t last_state;
1026
1027         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1028         __get_rx_machine_lock(port);
1029
1030         // keep current State Machine state to compare later if it was changed
1031         last_state = port->sm_rx_state;
1032
1033         // check if state machine should change state
1034         // first, check if port was reinitialized
1035         if (port->sm_vars & AD_PORT_BEGIN) {
1036                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1037         }
1038         // check if port is not enabled
1039         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1040                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1041         }
1042         // check if new lacpdu arrived
1043         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1044                 port->sm_rx_timer_counter = 0; // zero timer
1045                 port->sm_rx_state = AD_RX_CURRENT;
1046         } else {
1047                 // if timer is on, and if it is expired
1048                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1049                         switch (port->sm_rx_state) {
1050                         case AD_RX_EXPIRED:
1051                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1052                                 break;
1053                         case AD_RX_CURRENT:
1054                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1055                                 break;
1056                         default:    //to silence the compiler
1057                                 break;
1058                         }
1059                 } else {
1060                         // if no lacpdu arrived and no timer is on
1061                         switch (port->sm_rx_state) {
1062                         case AD_RX_PORT_DISABLED:
1063                                 if (port->sm_vars & AD_PORT_MOVED) {
1064                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1065                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1066                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1067                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1068                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1069                                 }
1070                                 break;
1071                         default:    //to silence the compiler
1072                                 break;
1073
1074                         }
1075                 }
1076         }
1077
1078         // check if the State machine was changed or new lacpdu arrived
1079         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1080                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_rx_state);
1081                 switch (port->sm_rx_state) {
1082                 case AD_RX_INITIALIZE:
1083                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1084                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1085                         } else {
1086                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1087                         }
1088                         port->sm_vars &= ~AD_PORT_SELECTED;
1089                         __record_default(port);
1090                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1091                         port->sm_vars &= ~AD_PORT_MOVED;
1092                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1093
1094                         /*- Fall Through -*/
1095
1096                 case AD_RX_PORT_DISABLED:
1097                         port->sm_vars &= ~AD_PORT_MATCHED;
1098                         break;
1099                 case AD_RX_LACP_DISABLED:
1100                         port->sm_vars &= ~AD_PORT_SELECTED;
1101                         __record_default(port);
1102                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1103                         port->sm_vars |= AD_PORT_MATCHED;
1104                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1105                         break;
1106                 case AD_RX_EXPIRED:
1107                         //Reset of the Synchronization flag. (Standard 43.4.12)
1108                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1109                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1110                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1111                         port->sm_vars &= ~AD_PORT_MATCHED;
1112                         port->partner_oper.port_state |=
1113                                 AD_STATE_LACP_ACTIVITY;
1114                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1115                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1116                         break;
1117                 case AD_RX_DEFAULTED:
1118                         __update_default_selected(port);
1119                         __record_default(port);
1120                         port->sm_vars |= AD_PORT_MATCHED;
1121                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1122                         break;
1123                 case AD_RX_CURRENT:
1124                         // detect loopback situation
1125                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1126                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1127                                 pr_err(DRV_NAME ": %s: An illegal loopback occurred on "
1128                                        "adapter (%s). Check the configuration to verify that all "
1129                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1130                                        port->slave->dev->master->name, port->slave->dev->name);
1131                                 __release_rx_machine_lock(port);
1132                                 return;
1133                         }
1134                         __update_selected(lacpdu, port);
1135                         __update_ntt(lacpdu, port);
1136                         __record_pdu(lacpdu, port);
1137                         __choose_matched(lacpdu, port);
1138                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1139                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1140                         // verify that if the aggregator is enabled, the port is enabled too.
1141                         //(because if the link goes down for a short time, the 802.3ad will not
1142                         // catch it, and the port will continue to be disabled)
1143                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1144                                 __enable_port(port);
1145                         }
1146                         break;
1147                 default:    //to silence the compiler
1148                         break;
1149                 }
1150         }
1151         __release_rx_machine_lock(port);
1152 }
1153
1154 /**
1155  * ad_tx_machine - handle a port's tx state machine
1156  * @port: the port we're looking at
1157  *
1158  */
1159 static void ad_tx_machine(struct port *port)
1160 {
1161         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1162         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1163                 // check if there is something to send
1164                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1165                         __update_lacpdu_from_port(port);
1166
1167                         if (ad_lacpdu_send(port) >= 0) {
1168                                 pr_debug("Sent LACPDU on port %d\n", port->actor_port_number);
1169
1170                                 /* mark ntt as false, so it will not be sent again until
1171                                    demanded */
1172                                 port->ntt = false;
1173                         }
1174                 }
1175                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1176                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1177         }
1178 }
1179
1180 /**
1181  * ad_periodic_machine - handle a port's periodic state machine
1182  * @port: the port we're looking at
1183  *
1184  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1185  */
1186 static void ad_periodic_machine(struct port *port)
1187 {
1188         periodic_states_t last_state;
1189
1190         // keep current state machine state to compare later if it was changed
1191         last_state = port->sm_periodic_state;
1192
1193         // check if port was reinitialized
1194         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1195             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1196            ) {
1197                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1198         }
1199         // check if state machine should change state
1200         else if (port->sm_periodic_timer_counter) {
1201                 // check if periodic state machine expired
1202                 if (!(--port->sm_periodic_timer_counter)) {
1203                         // if expired then do tx
1204                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1205                 } else {
1206                         // If not expired, check if there is some new timeout parameter from the partner state
1207                         switch (port->sm_periodic_state) {
1208                         case AD_FAST_PERIODIC:
1209                                 if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1210                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1211                                 }
1212                                 break;
1213                         case AD_SLOW_PERIODIC:
1214                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1215                                         // stop current timer
1216                                         port->sm_periodic_timer_counter = 0;
1217                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1218                                 }
1219                                 break;
1220                         default:    //to silence the compiler
1221                                 break;
1222                         }
1223                 }
1224         } else {
1225                 switch (port->sm_periodic_state) {
1226                 case AD_NO_PERIODIC:
1227                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1228                         break;
1229                 case AD_PERIODIC_TX:
1230                         if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1231                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1232                         } else {
1233                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1234                         }
1235                         break;
1236                 default:    //to silence the compiler
1237                         break;
1238                 }
1239         }
1240
1241         // check if the state machine was changed
1242         if (port->sm_periodic_state != last_state) {
1243                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1244                 switch (port->sm_periodic_state) {
1245                 case AD_NO_PERIODIC:
1246                         port->sm_periodic_timer_counter = 0;       // zero timer
1247                         break;
1248                 case AD_FAST_PERIODIC:
1249                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1250                         break;
1251                 case AD_SLOW_PERIODIC:
1252                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1253                         break;
1254                 case AD_PERIODIC_TX:
1255                         port->ntt = true;
1256                         break;
1257                 default:    //to silence the compiler
1258                         break;
1259                 }
1260         }
1261 }
1262
1263 /**
1264  * ad_port_selection_logic - select aggregation groups
1265  * @port: the port we're looking at
1266  *
1267  * Select aggregation groups, and assign each port for it's aggregetor. The
1268  * selection logic is called in the inititalization (after all the handshkes),
1269  * and after every lacpdu receive (if selected is off).
1270  */
1271 static void ad_port_selection_logic(struct port *port)
1272 {
1273         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1274         struct port *last_port = NULL, *curr_port;
1275         int found = 0;
1276
1277         // if the port is already Selected, do nothing
1278         if (port->sm_vars & AD_PORT_SELECTED) {
1279                 return;
1280         }
1281
1282         // if the port is connected to other aggregator, detach it
1283         if (port->aggregator) {
1284                 // detach the port from its former aggregator
1285                 temp_aggregator=port->aggregator;
1286                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1287                         if (curr_port == port) {
1288                                 temp_aggregator->num_of_ports--;
1289                                 if (!last_port) {// if it is the first port attached to the aggregator
1290                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1291                                 } else {// not the first port attached to the aggregator
1292                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1293                                 }
1294
1295                                 // clear the port's relations to this aggregator
1296                                 port->aggregator = NULL;
1297                                 port->next_port_in_aggregator=NULL;
1298                                 port->actor_port_aggregator_identifier=0;
1299
1300                                 pr_debug("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1301                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1302                                 if (!temp_aggregator->lag_ports) {
1303                                         ad_clear_agg(temp_aggregator);
1304                                 }
1305                                 break;
1306                         }
1307                 }
1308                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1309                         pr_warning(DRV_NAME ": %s: Warning: Port %d (on %s) "
1310                                    "was related to aggregator %d but was not "
1311                                    "on its port list\n",
1312                                    port->slave->dev->master->name,
1313                                    port->actor_port_number,
1314                                    port->slave->dev->name,
1315                                    port->aggregator->aggregator_identifier);
1316                 }
1317         }
1318         // search on all aggregators for a suitable aggregator for this port
1319         for (aggregator = __get_first_agg(port); aggregator;
1320              aggregator = __get_next_agg(aggregator)) {
1321
1322                 // keep a free aggregator for later use(if needed)
1323                 if (!aggregator->lag_ports) {
1324                         if (!free_aggregator) {
1325                                 free_aggregator=aggregator;
1326                         }
1327                         continue;
1328                 }
1329                 // check if current aggregator suits us
1330                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1331                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1332                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1333                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1334                     ) &&
1335                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1336                       !aggregator->is_individual)  // but is not individual OR
1337                     )
1338                    ) {
1339                         // attach to the founded aggregator
1340                         port->aggregator = aggregator;
1341                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1342                         port->next_port_in_aggregator=aggregator->lag_ports;
1343                         port->aggregator->num_of_ports++;
1344                         aggregator->lag_ports=port;
1345                         pr_debug("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1346
1347                         // mark this port as selected
1348                         port->sm_vars |= AD_PORT_SELECTED;
1349                         found = 1;
1350                         break;
1351                 }
1352         }
1353
1354         // the port couldn't find an aggregator - attach it to a new aggregator
1355         if (!found) {
1356                 if (free_aggregator) {
1357                         // assign port a new aggregator
1358                         port->aggregator = free_aggregator;
1359                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1360
1361                         // update the new aggregator's parameters
1362                         // if port was responsed from the end-user
1363                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1364                                 port->aggregator->is_individual = false;
1365                         } else {
1366                                 port->aggregator->is_individual = true;
1367                         }
1368
1369                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1370                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1371                         port->aggregator->partner_system=port->partner_oper.system;
1372                         port->aggregator->partner_system_priority = port->partner_oper.system_priority;
1373                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1374                         port->aggregator->receive_state = 1;
1375                         port->aggregator->transmit_state = 1;
1376                         port->aggregator->lag_ports = port;
1377                         port->aggregator->num_of_ports++;
1378
1379                         // mark this port as selected
1380                         port->sm_vars |= AD_PORT_SELECTED;
1381
1382                         pr_debug("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1383                 } else {
1384                         pr_err(DRV_NAME ": %s: Port %d (on %s) did not find "
1385                                "a suitable aggregator\n",
1386                                port->slave->dev->master->name,
1387                                port->actor_port_number, port->slave->dev->name);
1388                 }
1389         }
1390         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1391         // else set ready=FALSE in all aggregator's ports
1392         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1393
1394         aggregator = __get_first_agg(port);
1395         ad_agg_selection_logic(aggregator);
1396 }
1397
1398 /*
1399  * Decide if "agg" is a better choice for the new active aggregator that
1400  * the current best, according to the ad_select policy.
1401  */
1402 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1403                                                 struct aggregator *curr)
1404 {
1405         /*
1406          * 0. If no best, select current.
1407          *
1408          * 1. If the current agg is not individual, and the best is
1409          *    individual, select current.
1410          *
1411          * 2. If current agg is individual and the best is not, keep best.
1412          *
1413          * 3. Therefore, current and best are both individual or both not
1414          *    individual, so:
1415          *
1416          * 3a. If current agg partner replied, and best agg partner did not,
1417          *     select current.
1418          *
1419          * 3b. If current agg partner did not reply and best agg partner
1420          *     did reply, keep best.
1421          *
1422          * 4.  Therefore, current and best both have partner replies or
1423          *     both do not, so perform selection policy:
1424          *
1425          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1426          *     select by bandwidth.
1427          *
1428          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1429          */
1430         if (!best)
1431                 return curr;
1432
1433         if (!curr->is_individual && best->is_individual)
1434                 return curr;
1435
1436         if (curr->is_individual && !best->is_individual)
1437                 return best;
1438
1439         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1440                 return curr;
1441
1442         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1443                 return best;
1444
1445         switch (__get_agg_selection_mode(curr->lag_ports)) {
1446         case BOND_AD_COUNT:
1447                 if (curr->num_of_ports > best->num_of_ports)
1448                         return curr;
1449
1450                 if (curr->num_of_ports < best->num_of_ports)
1451                         return best;
1452
1453                 /*FALLTHROUGH*/
1454         case BOND_AD_STABLE:
1455         case BOND_AD_BANDWIDTH:
1456                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1457                         return curr;
1458
1459                 break;
1460
1461         default:
1462                 pr_warning(DRV_NAME
1463                            ": %s: Impossible agg select mode %d\n",
1464                            curr->slave->dev->master->name,
1465                            __get_agg_selection_mode(curr->lag_ports));
1466                 break;
1467         }
1468
1469         return best;
1470 }
1471
1472 static int agg_device_up(const struct aggregator *agg)
1473 {
1474         return (netif_running(agg->slave->dev) &&
1475                 netif_carrier_ok(agg->slave->dev));
1476 }
1477
1478 /**
1479  * ad_agg_selection_logic - select an aggregation group for a team
1480  * @aggregator: the aggregator we're looking at
1481  *
1482  * It is assumed that only one aggregator may be selected for a team.
1483  *
1484  * The logic of this function is to select the aggregator according to
1485  * the ad_select policy:
1486  *
1487  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1488  * it, and to reselect the active aggregator only if the previous
1489  * aggregator has no more ports related to it.
1490  *
1491  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1492  * bandwidth, and reselect whenever a link state change takes place or the
1493  * set of slaves in the bond changes.
1494  *
1495  * BOND_AD_COUNT: select the aggregator with largest number of ports
1496  * (slaves), and reselect whenever a link state change takes place or the
1497  * set of slaves in the bond changes.
1498  *
1499  * FIXME: this function MUST be called with the first agg in the bond, or
1500  * __get_active_agg() won't work correctly. This function should be better
1501  * called with the bond itself, and retrieve the first agg from it.
1502  */
1503 static void ad_agg_selection_logic(struct aggregator *agg)
1504 {
1505         struct aggregator *best, *active, *origin;
1506         struct port *port;
1507
1508         origin = agg;
1509         active = __get_active_agg(agg);
1510         best = (active && agg_device_up(active)) ? active : NULL;
1511
1512         do {
1513                 agg->is_active = 0;
1514
1515                 if (agg->num_of_ports && agg_device_up(agg))
1516                         best = ad_agg_selection_test(best, agg);
1517
1518         } while ((agg = __get_next_agg(agg)));
1519
1520         if (best &&
1521             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1522                 /*
1523                  * For the STABLE policy, don't replace the old active
1524                  * aggregator if it's still active (it has an answering
1525                  * partner) or if both the best and active don't have an
1526                  * answering partner.
1527                  */
1528                 if (active && active->lag_ports &&
1529                     active->lag_ports->is_enabled &&
1530                     (__agg_has_partner(active) ||
1531                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1532                         if (!(!active->actor_oper_aggregator_key &&
1533                               best->actor_oper_aggregator_key)) {
1534                                 best = NULL;
1535                                 active->is_active = 1;
1536                         }
1537                 }
1538         }
1539
1540         if (best && (best == active)) {
1541                 best = NULL;
1542                 active->is_active = 1;
1543         }
1544
1545         // if there is new best aggregator, activate it
1546         if (best) {
1547                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1548                        best->aggregator_identifier, best->num_of_ports,
1549                        best->actor_oper_aggregator_key,
1550                        best->partner_oper_aggregator_key,
1551                        best->is_individual, best->is_active);
1552                 pr_debug("best ports %p slave %p %s\n",
1553                        best->lag_ports, best->slave,
1554                        best->slave ? best->slave->dev->name : "NULL");
1555
1556                 for (agg = __get_first_agg(best->lag_ports); agg;
1557                      agg = __get_next_agg(agg)) {
1558
1559                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1560                                 agg->aggregator_identifier, agg->num_of_ports,
1561                                 agg->actor_oper_aggregator_key,
1562                                 agg->partner_oper_aggregator_key,
1563                                 agg->is_individual, agg->is_active);
1564                 }
1565
1566                 // check if any partner replys
1567                 if (best->is_individual) {
1568                         pr_warning(DRV_NAME ": %s: Warning: No 802.3ad"
1569                                " response from the link partner for any"
1570                                " adapters in the bond\n",
1571                                best->slave->dev->master->name);
1572                 }
1573
1574                 best->is_active = 1;
1575                 pr_debug("LAG %d chosen as the active LAG\n",
1576                         best->aggregator_identifier);
1577                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1578                         best->aggregator_identifier, best->num_of_ports,
1579                         best->actor_oper_aggregator_key,
1580                         best->partner_oper_aggregator_key,
1581                         best->is_individual, best->is_active);
1582
1583                 // disable the ports that were related to the former active_aggregator
1584                 if (active) {
1585                         for (port = active->lag_ports; port;
1586                              port = port->next_port_in_aggregator) {
1587                                 __disable_port(port);
1588                         }
1589                 }
1590         }
1591
1592         /*
1593          * if the selected aggregator is of join individuals
1594          * (partner_system is NULL), enable their ports
1595          */
1596         active = __get_active_agg(origin);
1597
1598         if (active) {
1599                 if (!__agg_has_partner(active)) {
1600                         for (port = active->lag_ports; port;
1601                              port = port->next_port_in_aggregator) {
1602                                 __enable_port(port);
1603                         }
1604                 }
1605         }
1606
1607         if (origin->slave) {
1608                 struct bonding *bond;
1609
1610                 bond = bond_get_bond_by_slave(origin->slave);
1611                 if (bond)
1612                         bond_3ad_set_carrier(bond);
1613         }
1614 }
1615
1616 /**
1617  * ad_clear_agg - clear a given aggregator's parameters
1618  * @aggregator: the aggregator we're looking at
1619  *
1620  */
1621 static void ad_clear_agg(struct aggregator *aggregator)
1622 {
1623         if (aggregator) {
1624                 aggregator->is_individual = false;
1625                 aggregator->actor_admin_aggregator_key = 0;
1626                 aggregator->actor_oper_aggregator_key = 0;
1627                 aggregator->partner_system = null_mac_addr;
1628                 aggregator->partner_system_priority = 0;
1629                 aggregator->partner_oper_aggregator_key = 0;
1630                 aggregator->receive_state = 0;
1631                 aggregator->transmit_state = 0;
1632                 aggregator->lag_ports = NULL;
1633                 aggregator->is_active = 0;
1634                 aggregator->num_of_ports = 0;
1635                 pr_debug("LAG %d was cleared\n", aggregator->aggregator_identifier);
1636         }
1637 }
1638
1639 /**
1640  * ad_initialize_agg - initialize a given aggregator's parameters
1641  * @aggregator: the aggregator we're looking at
1642  *
1643  */
1644 static void ad_initialize_agg(struct aggregator *aggregator)
1645 {
1646         if (aggregator) {
1647                 ad_clear_agg(aggregator);
1648
1649                 aggregator->aggregator_mac_address = null_mac_addr;
1650                 aggregator->aggregator_identifier = 0;
1651                 aggregator->slave = NULL;
1652         }
1653 }
1654
1655 /**
1656  * ad_initialize_port - initialize a given port's parameters
1657  * @aggregator: the aggregator we're looking at
1658  * @lacp_fast: boolean. whether fast periodic should be used
1659  *
1660  */
1661 static void ad_initialize_port(struct port *port, int lacp_fast)
1662 {
1663         static const struct port_params tmpl = {
1664                 .system_priority = 0xffff,
1665                 .key             = 1,
1666                 .port_number     = 1,
1667                 .port_priority   = 0xff,
1668                 .port_state      = 1,
1669         };
1670         static const struct lacpdu lacpdu = {
1671                 .subtype                = 0x01,
1672                 .version_number = 0x01,
1673                 .tlv_type_actor_info = 0x01,
1674                 .actor_information_length = 0x14,
1675                 .tlv_type_partner_info = 0x02,
1676                 .partner_information_length = 0x14,
1677                 .tlv_type_collector_info = 0x03,
1678                 .collector_information_length = 0x10,
1679                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1680         };
1681
1682         if (port) {
1683                 port->actor_port_number = 1;
1684                 port->actor_port_priority = 0xff;
1685                 port->actor_system = null_mac_addr;
1686                 port->actor_system_priority = 0xffff;
1687                 port->actor_port_aggregator_identifier = 0;
1688                 port->ntt = false;
1689                 port->actor_admin_port_key = 1;
1690                 port->actor_oper_port_key  = 1;
1691                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1692                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1693
1694                 if (lacp_fast) {
1695                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1696                 }
1697
1698                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1699                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1700
1701                 port->is_enabled = true;
1702                 // ****** private parameters ******
1703                 port->sm_vars = 0x3;
1704                 port->sm_rx_state = 0;
1705                 port->sm_rx_timer_counter = 0;
1706                 port->sm_periodic_state = 0;
1707                 port->sm_periodic_timer_counter = 0;
1708                 port->sm_mux_state = 0;
1709                 port->sm_mux_timer_counter = 0;
1710                 port->sm_tx_state = 0;
1711                 port->sm_tx_timer_counter = 0;
1712                 port->slave = NULL;
1713                 port->aggregator = NULL;
1714                 port->next_port_in_aggregator = NULL;
1715                 port->transaction_id = 0;
1716
1717                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1718         }
1719 }
1720
1721 /**
1722  * ad_enable_collecting_distributing - enable a port's transmit/receive
1723  * @port: the port we're looking at
1724  *
1725  * Enable @port if it's in an active aggregator
1726  */
1727 static void ad_enable_collecting_distributing(struct port *port)
1728 {
1729         if (port->aggregator->is_active) {
1730                 pr_debug("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1731                 __enable_port(port);
1732         }
1733 }
1734
1735 /**
1736  * ad_disable_collecting_distributing - disable a port's transmit/receive
1737  * @port: the port we're looking at
1738  *
1739  */
1740 static void ad_disable_collecting_distributing(struct port *port)
1741 {
1742         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1743                 pr_debug("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1744                 __disable_port(port);
1745         }
1746 }
1747
1748 #if 0
1749 /**
1750  * ad_marker_info_send - send a marker information frame
1751  * @port: the port we're looking at
1752  *
1753  * This function does nothing since we decided not to implement send and handle
1754  * response for marker PDU's, in this stage, but only to respond to marker
1755  * information.
1756  */
1757 static void ad_marker_info_send(struct port *port)
1758 {
1759         struct bond_marker marker;
1760         u16 index;
1761
1762         // fill the marker PDU with the appropriate values
1763         marker.subtype = 0x02;
1764         marker.version_number = 0x01;
1765         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1766         marker.marker_length = 0x16;
1767         // convert requester_port to Big Endian
1768         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1769         marker.requester_system = port->actor_system;
1770         // convert requester_port(u32) to Big Endian
1771         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1772         marker.pad = 0;
1773         marker.tlv_type_terminator = 0x00;
1774         marker.terminator_length = 0x00;
1775         for (index=0; index<90; index++) {
1776                 marker.reserved_90[index]=0;
1777         }
1778
1779         // send the marker information
1780         if (ad_marker_send(port, &marker) >= 0) {
1781                 pr_debug("Sent Marker Information on port %d\n", port->actor_port_number);
1782         }
1783 }
1784 #endif
1785
1786 /**
1787  * ad_marker_info_received - handle receive of a Marker information frame
1788  * @marker_info: Marker info received
1789  * @port: the port we're looking at
1790  *
1791  */
1792 static void ad_marker_info_received(struct bond_marker *marker_info,
1793         struct port *port)
1794 {
1795         struct bond_marker marker;
1796
1797         // copy the received marker data to the response marker
1798         //marker = *marker_info;
1799         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1800         // change the marker subtype to marker response
1801         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1802         // send the marker response
1803
1804         if (ad_marker_send(port, &marker) >= 0) {
1805                 pr_debug("Sent Marker Response on port %d\n", port->actor_port_number);
1806         }
1807 }
1808
1809 /**
1810  * ad_marker_response_received - handle receive of a marker response frame
1811  * @marker: marker PDU received
1812  * @port: the port we're looking at
1813  *
1814  * This function does nothing since we decided not to implement send and handle
1815  * response for marker PDU's, in this stage, but only to respond to marker
1816  * information.
1817  */
1818 static void ad_marker_response_received(struct bond_marker *marker,
1819         struct port *port)
1820 {
1821         marker=NULL; // just to satisfy the compiler
1822         port=NULL;  // just to satisfy the compiler
1823         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1824 }
1825
1826 //////////////////////////////////////////////////////////////////////////////////////
1827 // ================= AD exported functions to the main bonding code ==================
1828 //////////////////////////////////////////////////////////////////////////////////////
1829
1830 // Check aggregators status in team every T seconds
1831 #define AD_AGGREGATOR_SELECTION_TIMER  8
1832
1833 /*
1834  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1835  *
1836  * Set the aggregation selection timer, to initiate an agg selection in
1837  * the very near future.  Called during first initialization, and during
1838  * any down to up transitions of the bond.
1839  */
1840 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1841 {
1842         BOND_AD_INFO(bond).agg_select_timer = timeout;
1843         BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
1844 }
1845
1846 static u16 aggregator_identifier;
1847
1848 /**
1849  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1850  * @bond: bonding struct to work on
1851  * @tick_resolution: tick duration (millisecond resolution)
1852  * @lacp_fast: boolean. whether fast periodic should be used
1853  *
1854  * Can be called only after the mac address of the bond is set.
1855  */
1856 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1857 {
1858         // check that the bond is not initialized yet
1859         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1860                                 bond->dev->dev_addr)) {
1861
1862                 aggregator_identifier = 0;
1863
1864                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1865                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1866                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1867
1868                 // initialize how many times this module is called in one second(should be about every 100ms)
1869                 ad_ticks_per_sec = tick_resolution;
1870
1871                 bond_3ad_initiate_agg_selection(bond,
1872                                                 AD_AGGREGATOR_SELECTION_TIMER *
1873                                                 ad_ticks_per_sec);
1874         }
1875 }
1876
1877 /**
1878  * bond_3ad_bind_slave - initialize a slave's port
1879  * @slave: slave struct to work on
1880  *
1881  * Returns:   0 on success
1882  *          < 0 on error
1883  */
1884 int bond_3ad_bind_slave(struct slave *slave)
1885 {
1886         struct bonding *bond = bond_get_bond_by_slave(slave);
1887         struct port *port;
1888         struct aggregator *aggregator;
1889
1890         if (bond == NULL) {
1891                 pr_err(DRV_NAME ": %s: The slave %s is not attached to "
1892                        "its bond\n",
1893                        slave->dev->master->name, slave->dev->name);
1894                 return -1;
1895         }
1896
1897         //check that the slave has not been intialized yet.
1898         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1899
1900                 // port initialization
1901                 port = &(SLAVE_AD_INFO(slave).port);
1902
1903                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1904
1905                 port->slave = slave;
1906                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1907                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1908                 //              ------------------------------------------------------------
1909                 // Port key :   | User key                       |      Speed       |Duplex|
1910                 //              ------------------------------------------------------------
1911                 //              16                               6               1 0
1912                 port->actor_admin_port_key = 0; // initialize this parameter
1913                 port->actor_admin_port_key |= __get_duplex(port);
1914                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1915                 port->actor_oper_port_key = port->actor_admin_port_key;
1916                 // if the port is not full duplex, then the port should be not lacp Enabled
1917                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1918                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1919                 }
1920                 // actor system is the bond's system
1921                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1922                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1923                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1924                 port->aggregator = NULL;
1925                 port->next_port_in_aggregator = NULL;
1926
1927                 __disable_port(port);
1928                 __initialize_port_locks(port);
1929
1930
1931                 // aggregator initialization
1932                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1933
1934                 ad_initialize_agg(aggregator);
1935
1936                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1937                 aggregator->aggregator_identifier = (++aggregator_identifier);
1938                 aggregator->slave = slave;
1939                 aggregator->is_active = 0;
1940                 aggregator->num_of_ports = 0;
1941         }
1942
1943         return 0;
1944 }
1945
1946 /**
1947  * bond_3ad_unbind_slave - deinitialize a slave's port
1948  * @slave: slave struct to work on
1949  *
1950  * Search for the aggregator that is related to this port, remove the
1951  * aggregator and assign another aggregator for other port related to it
1952  * (if any), and remove the port.
1953  */
1954 void bond_3ad_unbind_slave(struct slave *slave)
1955 {
1956         struct port *port, *prev_port, *temp_port;
1957         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1958         int select_new_active_agg = 0;
1959
1960         // find the aggregator related to this slave
1961         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1962
1963         // find the port related to this slave
1964         port = &(SLAVE_AD_INFO(slave).port);
1965
1966         // if slave is null, the whole port is not initialized
1967         if (!port->slave) {
1968                 pr_warning(DRV_NAME ": Warning: %s: Trying to "
1969                            "unbind an uninitialized port on %s\n",
1970                            slave->dev->master->name, slave->dev->name);
1971                 return;
1972         }
1973
1974         pr_debug("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1975
1976         /* Tell the partner that this port is not suitable for aggregation */
1977         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1978         __update_lacpdu_from_port(port);
1979         ad_lacpdu_send(port);
1980
1981         // check if this aggregator is occupied
1982         if (aggregator->lag_ports) {
1983                 // check if there are other ports related to this aggregator except
1984                 // the port related to this slave(thats ensure us that there is a
1985                 // reason to search for new aggregator, and that we will find one
1986                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1987                         // find new aggregator for the related port(s)
1988                         new_aggregator = __get_first_agg(port);
1989                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1990                                 // if the new aggregator is empty, or it is connected to our port only
1991                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1992                                         break;
1993                                 }
1994                         }
1995                         // if new aggregator found, copy the aggregator's parameters
1996                         // and connect the related lag_ports to the new aggregator
1997                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1998                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
1999
2000                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
2001                                         pr_info(DRV_NAME ": %s: Removing an active aggregator\n",
2002                                                 aggregator->slave->dev->master->name);
2003                                         // select new active aggregator
2004                                          select_new_active_agg = 1;
2005                                 }
2006
2007                                 new_aggregator->is_individual = aggregator->is_individual;
2008                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2009                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2010                                 new_aggregator->partner_system = aggregator->partner_system;
2011                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2012                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2013                                 new_aggregator->receive_state = aggregator->receive_state;
2014                                 new_aggregator->transmit_state = aggregator->transmit_state;
2015                                 new_aggregator->lag_ports = aggregator->lag_ports;
2016                                 new_aggregator->is_active = aggregator->is_active;
2017                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2018
2019                                 // update the information that is written on the ports about the aggregator
2020                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2021                                         temp_port->aggregator=new_aggregator;
2022                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2023                                 }
2024
2025                                 // clear the aggregator
2026                                 ad_clear_agg(aggregator);
2027
2028                                 if (select_new_active_agg) {
2029                                         ad_agg_selection_logic(__get_first_agg(port));
2030                                 }
2031                         } else {
2032                                 pr_warning(DRV_NAME ": %s: Warning: unbinding aggregator, "
2033                                            "and could not find a new aggregator for its ports\n",
2034                                            slave->dev->master->name);
2035                         }
2036                 } else { // in case that the only port related to this aggregator is the one we want to remove
2037                         select_new_active_agg = aggregator->is_active;
2038                         // clear the aggregator
2039                         ad_clear_agg(aggregator);
2040                         if (select_new_active_agg) {
2041                                 pr_info(DRV_NAME ": %s: Removing an active aggregator\n",
2042                                         slave->dev->master->name);
2043                                 // select new active aggregator
2044                                 ad_agg_selection_logic(__get_first_agg(port));
2045                         }
2046                 }
2047         }
2048
2049         pr_debug("Unbinding port %d\n", port->actor_port_number);
2050         // find the aggregator that this port is connected to
2051         temp_aggregator = __get_first_agg(port);
2052         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2053                 prev_port = NULL;
2054                 // search the port in the aggregator's related ports
2055                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2056                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2057                                 if (prev_port) {
2058                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2059                                 } else {
2060                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2061                                 }
2062                                 temp_aggregator->num_of_ports--;
2063                                 if (temp_aggregator->num_of_ports==0) {
2064                                         select_new_active_agg = temp_aggregator->is_active;
2065                                         // clear the aggregator
2066                                         ad_clear_agg(temp_aggregator);
2067                                         if (select_new_active_agg) {
2068                                                 pr_info(DRV_NAME ": %s: Removing an active aggregator\n",
2069                                                         slave->dev->master->name);
2070                                                 // select new active aggregator
2071                                                 ad_agg_selection_logic(__get_first_agg(port));
2072                                         }
2073                                 }
2074                                 break;
2075                         }
2076                 }
2077         }
2078         port->slave=NULL;
2079 }
2080
2081 /**
2082  * bond_3ad_state_machine_handler - handle state machines timeout
2083  * @bond: bonding struct to work on
2084  *
2085  * The state machine handling concept in this module is to check every tick
2086  * which state machine should operate any function. The execution order is
2087  * round robin, so when we have an interaction between state machines, the
2088  * reply of one to each other might be delayed until next tick.
2089  *
2090  * This function also complete the initialization when the agg_select_timer
2091  * times out, and it selects an aggregator for the ports that are yet not
2092  * related to any aggregator, and selects the active aggregator for a bond.
2093  */
2094 void bond_3ad_state_machine_handler(struct work_struct *work)
2095 {
2096         struct bonding *bond = container_of(work, struct bonding,
2097                                             ad_work.work);
2098         struct port *port;
2099         struct aggregator *aggregator;
2100
2101         read_lock(&bond->lock);
2102
2103         if (bond->kill_timers) {
2104                 goto out;
2105         }
2106
2107         //check if there are any slaves
2108         if (bond->slave_cnt == 0) {
2109                 goto re_arm;
2110         }
2111
2112         // check if agg_select_timer timer after initialize is timed out
2113         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2114                 // select the active aggregator for the bond
2115                 if ((port = __get_first_port(bond))) {
2116                         if (!port->slave) {
2117                                 pr_warning(DRV_NAME ": %s: Warning: bond's first port is "
2118                                            "uninitialized\n", bond->dev->name);
2119                                 goto re_arm;
2120                         }
2121
2122                         aggregator = __get_first_agg(port);
2123                         ad_agg_selection_logic(aggregator);
2124                 }
2125                 bond_3ad_set_carrier(bond);
2126         }
2127
2128         // for each port run the state machines
2129         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2130                 if (!port->slave) {
2131                         pr_warning(DRV_NAME ": %s: Warning: Found an uninitialized "
2132                                    "port\n", bond->dev->name);
2133                         goto re_arm;
2134                 }
2135
2136                 ad_rx_machine(NULL, port);
2137                 ad_periodic_machine(port);
2138                 ad_port_selection_logic(port);
2139                 ad_mux_machine(port);
2140                 ad_tx_machine(port);
2141
2142                 // turn off the BEGIN bit, since we already handled it
2143                 if (port->sm_vars & AD_PORT_BEGIN) {
2144                         port->sm_vars &= ~AD_PORT_BEGIN;
2145                 }
2146         }
2147
2148 re_arm:
2149         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2150 out:
2151         read_unlock(&bond->lock);
2152 }
2153
2154 /**
2155  * bond_3ad_rx_indication - handle a received frame
2156  * @lacpdu: received lacpdu
2157  * @slave: slave struct to work on
2158  * @length: length of the data received
2159  *
2160  * It is assumed that frames that were sent on this NIC don't returned as new
2161  * received frames (loopback). Since only the payload is given to this
2162  * function, it check for loopback.
2163  */
2164 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2165 {
2166         struct port *port;
2167
2168         if (length >= sizeof(struct lacpdu)) {
2169
2170                 port = &(SLAVE_AD_INFO(slave).port);
2171
2172                 if (!port->slave) {
2173                         pr_warning(DRV_NAME ": %s: Warning: port of slave %s "
2174                                    "is uninitialized\n",
2175                                    slave->dev->name, slave->dev->master->name);
2176                         return;
2177                 }
2178
2179                 switch (lacpdu->subtype) {
2180                 case AD_TYPE_LACPDU:
2181                         pr_debug("Received LACPDU on port %d\n", port->actor_port_number);
2182                         ad_rx_machine(lacpdu, port);
2183                         break;
2184
2185                 case AD_TYPE_MARKER:
2186                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2187
2188                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2189                         case AD_MARKER_INFORMATION_SUBTYPE:
2190                                 pr_debug("Received Marker Information on port %d\n", port->actor_port_number);
2191                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2192                                 break;
2193
2194                         case AD_MARKER_RESPONSE_SUBTYPE:
2195                                 pr_debug("Received Marker Response on port %d\n", port->actor_port_number);
2196                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2197                                 break;
2198
2199                         default:
2200                                 pr_debug("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2201                         }
2202                 }
2203         }
2204 }
2205
2206 /**
2207  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2208  * @slave: slave struct to work on
2209  *
2210  * Handle reselection of aggregator (if needed) for this port.
2211  */
2212 void bond_3ad_adapter_speed_changed(struct slave *slave)
2213 {
2214         struct port *port;
2215
2216         port = &(SLAVE_AD_INFO(slave).port);
2217
2218         // if slave is null, the whole port is not initialized
2219         if (!port->slave) {
2220                 pr_warning(DRV_NAME ": Warning: %s: speed "
2221                            "changed for uninitialized port on %s\n",
2222                            slave->dev->master->name, slave->dev->name);
2223                 return;
2224         }
2225
2226         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2227         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2228         pr_debug("Port %d changed speed\n", port->actor_port_number);
2229         // there is no need to reselect a new aggregator, just signal the
2230         // state machines to reinitialize
2231         port->sm_vars |= AD_PORT_BEGIN;
2232 }
2233
2234 /**
2235  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2236  * @slave: slave struct to work on
2237  *
2238  * Handle reselection of aggregator (if needed) for this port.
2239  */
2240 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2241 {
2242         struct port *port;
2243
2244         port=&(SLAVE_AD_INFO(slave).port);
2245
2246         // if slave is null, the whole port is not initialized
2247         if (!port->slave) {
2248                 pr_warning(DRV_NAME ": %s: Warning: duplex changed "
2249                            "for uninitialized port on %s\n",
2250                            slave->dev->master->name, slave->dev->name);
2251                 return;
2252         }
2253
2254         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2255         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2256         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2257         // there is no need to reselect a new aggregator, just signal the
2258         // state machines to reinitialize
2259         port->sm_vars |= AD_PORT_BEGIN;
2260 }
2261
2262 /**
2263  * bond_3ad_handle_link_change - handle a slave's link status change indication
2264  * @slave: slave struct to work on
2265  * @status: whether the link is now up or down
2266  *
2267  * Handle reselection of aggregator (if needed) for this port.
2268  */
2269 void bond_3ad_handle_link_change(struct slave *slave, char link)
2270 {
2271         struct port *port;
2272
2273         port = &(SLAVE_AD_INFO(slave).port);
2274
2275         // if slave is null, the whole port is not initialized
2276         if (!port->slave) {
2277                 pr_warning(DRV_NAME ": Warning: %s: link status changed for "
2278                            "uninitialized port on %s\n",
2279                            slave->dev->master->name, slave->dev->name);
2280                 return;
2281         }
2282
2283         // on link down we are zeroing duplex and speed since some of the adaptors(ce1000.lan) report full duplex/speed instead of N/A(duplex) / 0(speed)
2284         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2285         if (link == BOND_LINK_UP) {
2286                 port->is_enabled = true;
2287                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2288                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2289                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2290                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2291         } else {
2292                 /* link has failed */
2293                 port->is_enabled = false;
2294                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2295                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2296         }
2297         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2298         // there is no need to reselect a new aggregator, just signal the
2299         // state machines to reinitialize
2300         port->sm_vars |= AD_PORT_BEGIN;
2301 }
2302
2303 /*
2304  * set link state for bonding master: if we have an active
2305  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2306  * have an active aggregator if there are no slaves with link up.
2307  *
2308  * This behavior complies with IEEE 802.3 section 43.3.9.
2309  *
2310  * Called by bond_set_carrier(). Return zero if carrier state does not
2311  * change, nonzero if it does.
2312  */
2313 int bond_3ad_set_carrier(struct bonding *bond)
2314 {
2315         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2316                 if (!netif_carrier_ok(bond->dev)) {
2317                         netif_carrier_on(bond->dev);
2318                         return 1;
2319                 }
2320                 return 0;
2321         }
2322
2323         if (netif_carrier_ok(bond->dev)) {
2324                 netif_carrier_off(bond->dev);
2325                 return 1;
2326         }
2327         return 0;
2328 }
2329
2330 /**
2331  * bond_3ad_get_active_agg_info - get information of the active aggregator
2332  * @bond: bonding struct to work on
2333  * @ad_info: ad_info struct to fill with the bond's info
2334  *
2335  * Returns:   0 on success
2336  *          < 0 on error
2337  */
2338 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2339 {
2340         struct aggregator *aggregator = NULL;
2341         struct port *port;
2342
2343         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2344                 if (port->aggregator && port->aggregator->is_active) {
2345                         aggregator = port->aggregator;
2346                         break;
2347                 }
2348         }
2349
2350         if (aggregator) {
2351                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2352                 ad_info->ports = aggregator->num_of_ports;
2353                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2354                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2355                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2356                 return 0;
2357         }
2358
2359         return -1;
2360 }
2361
2362 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2363 {
2364         struct slave *slave, *start_at;
2365         struct bonding *bond = netdev_priv(dev);
2366         int slave_agg_no;
2367         int slaves_in_agg;
2368         int agg_id;
2369         int i;
2370         struct ad_info ad_info;
2371         int res = 1;
2372
2373         /* make sure that the slaves list will
2374          * not change during tx
2375          */
2376         read_lock(&bond->lock);
2377
2378         if (!BOND_IS_OK(bond)) {
2379                 goto out;
2380         }
2381
2382         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2383                 pr_debug(DRV_NAME ": %s: Error: "
2384                          "bond_3ad_get_active_agg_info failed\n", dev->name);
2385                 goto out;
2386         }
2387
2388         slaves_in_agg = ad_info.ports;
2389         agg_id = ad_info.aggregator_id;
2390
2391         if (slaves_in_agg == 0) {
2392                 /*the aggregator is empty*/
2393                 pr_debug(DRV_NAME ": %s: Error: active aggregator is empty\n",
2394                          dev->name);
2395                 goto out;
2396         }
2397
2398         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2399
2400         bond_for_each_slave(bond, slave, i) {
2401                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2402
2403                 if (agg && (agg->aggregator_identifier == agg_id)) {
2404                         slave_agg_no--;
2405                         if (slave_agg_no < 0) {
2406                                 break;
2407                         }
2408                 }
2409         }
2410
2411         if (slave_agg_no >= 0) {
2412                 pr_err(DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2413                        "for aggregator ID %d\n", dev->name, agg_id);
2414                 goto out;
2415         }
2416
2417         start_at = slave;
2418
2419         bond_for_each_slave_from(bond, slave, i, start_at) {
2420                 int slave_agg_id = 0;
2421                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2422
2423                 if (agg) {
2424                         slave_agg_id = agg->aggregator_identifier;
2425                 }
2426
2427                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2428                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2429                         break;
2430                 }
2431         }
2432
2433 out:
2434         if (res) {
2435                 /* no suitable interface, frame not sent */
2436                 dev_kfree_skb(skb);
2437         }
2438         read_unlock(&bond->lock);
2439         return NETDEV_TX_OK;
2440 }
2441
2442 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2443 {
2444         struct bonding *bond = netdev_priv(dev);
2445         struct slave *slave = NULL;
2446         int ret = NET_RX_DROP;
2447
2448         if (dev_net(dev) != &init_net)
2449                 goto out;
2450
2451         if (!(dev->flags & IFF_MASTER))
2452                 goto out;
2453
2454         read_lock(&bond->lock);
2455         slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev),
2456                                         orig_dev);
2457         if (!slave)
2458                 goto out_unlock;
2459
2460         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2461
2462         ret = NET_RX_SUCCESS;
2463
2464 out_unlock:
2465         read_unlock(&bond->lock);
2466 out:
2467         dev_kfree_skb(skb);
2468
2469         return ret;
2470 }
2471