git.oblomov.eu Git - linux-2.6/blob - 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 |= AD_SHORT_TIMEOUT;
1113                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1114                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1115                         break;
1116                 case AD_RX_DEFAULTED:
1117                         __update_default_selected(port);
1118                         __record_default(port);
1119                         port->sm_vars |= AD_PORT_MATCHED;
1120                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1121                         break;
1122                 case AD_RX_CURRENT:
1123                         // detect loopback situation
1124                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1125                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1126                                 printk(KERN_ERR DRV_NAME ": %s: An illegal loopback occurred on "
1127                                        "adapter (%s). Check the configuration to verify that all "
1128                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1129                                        port->slave->dev->master->name, port->slave->dev->name);
1130                                 __release_rx_machine_lock(port);
1131                                 return;
1132                         }
1133                         __update_selected(lacpdu, port);
1134                         __update_ntt(lacpdu, port);
1135                         __record_pdu(lacpdu, port);
1136                         __choose_matched(lacpdu, port);
1137                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1138                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1139                         // verify that if the aggregator is enabled, the port is enabled too.
1140                         //(because if the link goes down for a short time, the 802.3ad will not
1141                         // catch it, and the port will continue to be disabled)
1142                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1143                                 __enable_port(port);
1144                         }
1145                         break;
1146                 default:    //to silence the compiler
1147                         break;
1148                 }
1149         }
1150         __release_rx_machine_lock(port);
1151 }
1152
1153 /**
1154  * ad_tx_machine - handle a port's tx state machine
1155  * @port: the port we're looking at
1156  *
1157  */
1158 static void ad_tx_machine(struct port *port)
1159 {
1160         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1161         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1162                 // check if there is something to send
1163                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1164                         __update_lacpdu_from_port(port);
1165
1166                         if (ad_lacpdu_send(port) >= 0) {
1167                                 pr_debug("Sent LACPDU on port %d\n", port->actor_port_number);
1168
1169                                 /* mark ntt as false, so it will not be sent again until
1170                                    demanded */
1171                                 port->ntt = false;
1172                         }
1173                 }
1174                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1175                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1176         }
1177 }
1178
1179 /**
1180  * ad_periodic_machine - handle a port's periodic state machine
1181  * @port: the port we're looking at
1182  *
1183  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1184  */
1185 static void ad_periodic_machine(struct port *port)
1186 {
1187         periodic_states_t last_state;
1188
1189         // keep current state machine state to compare later if it was changed
1190         last_state = port->sm_periodic_state;
1191
1192         // check if port was reinitialized
1193         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1194             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1195            ) {
1196                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1197         }
1198         // check if state machine should change state
1199         else if (port->sm_periodic_timer_counter) {
1200                 // check if periodic state machine expired
1201                 if (!(--port->sm_periodic_timer_counter)) {
1202                         // if expired then do tx
1203                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1204                 } else {
1205                         // If not expired, check if there is some new timeout parameter from the partner state
1206                         switch (port->sm_periodic_state) {
1207                         case AD_FAST_PERIODIC:
1208                                 if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1209                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1210                                 }
1211                                 break;
1212                         case AD_SLOW_PERIODIC:
1213                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1214                                         // stop current timer
1215                                         port->sm_periodic_timer_counter = 0;
1216                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1217                                 }
1218                                 break;
1219                         default:    //to silence the compiler
1220                                 break;
1221                         }
1222                 }
1223         } else {
1224                 switch (port->sm_periodic_state) {
1225                 case AD_NO_PERIODIC:
1226                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1227                         break;
1228                 case AD_PERIODIC_TX:
1229                         if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1230                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1231                         } else {
1232                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1233                         }
1234                         break;
1235                 default:    //to silence the compiler
1236                         break;
1237                 }
1238         }
1239
1240         // check if the state machine was changed
1241         if (port->sm_periodic_state != last_state) {
1242                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1243                 switch (port->sm_periodic_state) {
1244                 case AD_NO_PERIODIC:
1245                         port->sm_periodic_timer_counter = 0;       // zero timer
1246                         break;
1247                 case AD_FAST_PERIODIC:
1248                         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
1249                         break;
1250                 case AD_SLOW_PERIODIC:
1251                         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
1252                         break;
1253                 case AD_PERIODIC_TX:
1254                         port->ntt = true;
1255                         break;
1256                 default:    //to silence the compiler
1257                         break;
1258                 }
1259         }
1260 }
1261
1262 /**
1263  * ad_port_selection_logic - select aggregation groups
1264  * @port: the port we're looking at
1265  *
1266  * Select aggregation groups, and assign each port for it's aggregetor. The
1267  * selection logic is called in the inititalization (after all the handshkes),
1268  * and after every lacpdu receive (if selected is off).
1269  */
1270 static void ad_port_selection_logic(struct port *port)
1271 {
1272         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1273         struct port *last_port = NULL, *curr_port;
1274         int found = 0;
1275
1276         // if the port is already Selected, do nothing
1277         if (port->sm_vars & AD_PORT_SELECTED) {
1278                 return;
1279         }
1280
1281         // if the port is connected to other aggregator, detach it
1282         if (port->aggregator) {
1283                 // detach the port from its former aggregator
1284                 temp_aggregator=port->aggregator;
1285                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1286                         if (curr_port == port) {
1287                                 temp_aggregator->num_of_ports--;
1288                                 if (!last_port) {// if it is the first port attached to the aggregator
1289                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1290                                 } else {// not the first port attached to the aggregator
1291                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1292                                 }
1293
1294                                 // clear the port's relations to this aggregator
1295                                 port->aggregator = NULL;
1296                                 port->next_port_in_aggregator=NULL;
1297                                 port->actor_port_aggregator_identifier=0;
1298
1299                                 pr_debug("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1300                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1301                                 if (!temp_aggregator->lag_ports) {
1302                                         ad_clear_agg(temp_aggregator);
1303                                 }
1304                                 break;
1305                         }
1306                 }
1307                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1308                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Port %d (on %s) was "
1309                                "related to aggregator %d but was not on its port list\n",
1310                                port->slave->dev->master->name,
1311                                port->actor_port_number, port->slave->dev->name,
1312                                port->aggregator->aggregator_identifier);
1313                 }
1314         }
1315         // search on all aggregators for a suitable aggregator for this port
1316         for (aggregator = __get_first_agg(port); aggregator;
1317              aggregator = __get_next_agg(aggregator)) {
1318
1319                 // keep a free aggregator for later use(if needed)
1320                 if (!aggregator->lag_ports) {
1321                         if (!free_aggregator) {
1322                                 free_aggregator=aggregator;
1323                         }
1324                         continue;
1325                 }
1326                 // check if current aggregator suits us
1327                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1328                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1329                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1330                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1331                     ) &&
1332                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1333                       !aggregator->is_individual)  // but is not individual OR
1334                     )
1335                    ) {
1336                         // attach to the founded aggregator
1337                         port->aggregator = aggregator;
1338                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1339                         port->next_port_in_aggregator=aggregator->lag_ports;
1340                         port->aggregator->num_of_ports++;
1341                         aggregator->lag_ports=port;
1342                         pr_debug("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1343
1344                         // mark this port as selected
1345                         port->sm_vars |= AD_PORT_SELECTED;
1346                         found = 1;
1347                         break;
1348                 }
1349         }
1350
1351         // the port couldn't find an aggregator - attach it to a new aggregator
1352         if (!found) {
1353                 if (free_aggregator) {
1354                         // assign port a new aggregator
1355                         port->aggregator = free_aggregator;
1356                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1357
1358                         // update the new aggregator's parameters
1359                         // if port was responsed from the end-user
1360                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1361                                 port->aggregator->is_individual = false;
1362                         } else {
1363                                 port->aggregator->is_individual = true;
1364                         }
1365
1366                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1367                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1368                         port->aggregator->partner_system=port->partner_oper.system;
1369                         port->aggregator->partner_system_priority = port->partner_oper.system_priority;
1370                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1371                         port->aggregator->receive_state = 1;
1372                         port->aggregator->transmit_state = 1;
1373                         port->aggregator->lag_ports = port;
1374                         port->aggregator->num_of_ports++;
1375
1376                         // mark this port as selected
1377                         port->sm_vars |= AD_PORT_SELECTED;
1378
1379                         pr_debug("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1380                 } else {
1381                         printk(KERN_ERR DRV_NAME ": %s: Port %d (on %s) did not find a suitable aggregator\n",
1382                                port->slave->dev->master->name,
1383                                port->actor_port_number, port->slave->dev->name);
1384                 }
1385         }
1386         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1387         // else set ready=FALSE in all aggregator's ports
1388         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1389
1390         aggregator = __get_first_agg(port);
1391         ad_agg_selection_logic(aggregator);
1392 }
1393
1394 /*
1395  * Decide if "agg" is a better choice for the new active aggregator that
1396  * the current best, according to the ad_select policy.
1397  */
1398 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1399                                                 struct aggregator *curr)
1400 {
1401         /*
1402          * 0. If no best, select current.
1403          *
1404          * 1. If the current agg is not individual, and the best is
1405          *    individual, select current.
1406          *
1407          * 2. If current agg is individual and the best is not, keep best.
1408          *
1409          * 3. Therefore, current and best are both individual or both not
1410          *    individual, so:
1411          *
1412          * 3a. If current agg partner replied, and best agg partner did not,
1413          *     select current.
1414          *
1415          * 3b. If current agg partner did not reply and best agg partner
1416          *     did reply, keep best.
1417          *
1418          * 4.  Therefore, current and best both have partner replies or
1419          *     both do not, so perform selection policy:
1420          *
1421          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1422          *     select by bandwidth.
1423          *
1424          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1425          */
1426         if (!best)
1427                 return curr;
1428
1429         if (!curr->is_individual && best->is_individual)
1430                 return curr;
1431
1432         if (curr->is_individual && !best->is_individual)
1433                 return best;
1434
1435         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1436                 return curr;
1437
1438         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1439                 return best;
1440
1441         switch (__get_agg_selection_mode(curr->lag_ports)) {
1442         case BOND_AD_COUNT:
1443                 if (curr->num_of_ports > best->num_of_ports)
1444                         return curr;
1445
1446                 if (curr->num_of_ports < best->num_of_ports)
1447                         return best;
1448
1449                 /*FALLTHROUGH*/
1450         case BOND_AD_STABLE:
1451         case BOND_AD_BANDWIDTH:
1452                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1453                         return curr;
1454
1455                 break;
1456
1457         default:
1458                 printk(KERN_WARNING DRV_NAME
1459                        ": %s: Impossible agg select mode %d\n",
1460                        curr->slave->dev->master->name,
1461                        __get_agg_selection_mode(curr->lag_ports));
1462                 break;
1463         }
1464
1465         return best;
1466 }
1467
1468 static int agg_device_up(const struct aggregator *agg)
1469 {
1470         return (netif_running(agg->slave->dev) &&
1471                 netif_carrier_ok(agg->slave->dev));
1472 }
1473
1474 /**
1475  * ad_agg_selection_logic - select an aggregation group for a team
1476  * @aggregator: the aggregator we're looking at
1477  *
1478  * It is assumed that only one aggregator may be selected for a team.
1479  *
1480  * The logic of this function is to select the aggregator according to
1481  * the ad_select policy:
1482  *
1483  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1484  * it, and to reselect the active aggregator only if the previous
1485  * aggregator has no more ports related to it.
1486  *
1487  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1488  * bandwidth, and reselect whenever a link state change takes place or the
1489  * set of slaves in the bond changes.
1490  *
1491  * BOND_AD_COUNT: select the aggregator with largest number of ports
1492  * (slaves), and reselect whenever a link state change takes place or the
1493  * set of slaves in the bond changes.
1494  *
1495  * FIXME: this function MUST be called with the first agg in the bond, or
1496  * __get_active_agg() won't work correctly. This function should be better
1497  * called with the bond itself, and retrieve the first agg from it.
1498  */
1499 static void ad_agg_selection_logic(struct aggregator *agg)
1500 {
1501         struct aggregator *best, *active, *origin;
1502         struct port *port;
1503
1504         origin = agg;
1505         active = __get_active_agg(agg);
1506         best = (active && agg_device_up(active)) ? active : NULL;
1507
1508         do {
1509                 agg->is_active = 0;
1510
1511                 if (agg->num_of_ports && agg_device_up(agg))
1512                         best = ad_agg_selection_test(best, agg);
1513
1514         } while ((agg = __get_next_agg(agg)));
1515
1516         if (best &&
1517             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1518                 /*
1519                  * For the STABLE policy, don't replace the old active
1520                  * aggregator if it's still active (it has an answering
1521                  * partner) or if both the best and active don't have an
1522                  * answering partner.
1523                  */
1524                 if (active && active->lag_ports &&
1525                     active->lag_ports->is_enabled &&
1526                     (__agg_has_partner(active) ||
1527                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1528                         if (!(!active->actor_oper_aggregator_key &&
1529                               best->actor_oper_aggregator_key)) {
1530                                 best = NULL;
1531                                 active->is_active = 1;
1532                         }
1533                 }
1534         }
1535
1536         if (best && (best == active)) {
1537                 best = NULL;
1538                 active->is_active = 1;
1539         }
1540
1541         // if there is new best aggregator, activate it
1542         if (best) {
1543                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1544                        best->aggregator_identifier, best->num_of_ports,
1545                        best->actor_oper_aggregator_key,
1546                        best->partner_oper_aggregator_key,
1547                        best->is_individual, best->is_active);
1548                 pr_debug("best ports %p slave %p %s\n",
1549                        best->lag_ports, best->slave,
1550                        best->slave ? best->slave->dev->name : "NULL");
1551
1552                 for (agg = __get_first_agg(best->lag_ports); agg;
1553                      agg = __get_next_agg(agg)) {
1554
1555                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1556                                 agg->aggregator_identifier, agg->num_of_ports,
1557                                 agg->actor_oper_aggregator_key,
1558                                 agg->partner_oper_aggregator_key,
1559                                 agg->is_individual, agg->is_active);
1560                 }
1561
1562                 // check if any partner replys
1563                 if (best->is_individual) {
1564                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad"
1565                                " response from the link partner for any"
1566                                " adapters in the bond\n",
1567                                best->slave->dev->master->name);
1568                 }
1569
1570                 best->is_active = 1;
1571                 pr_debug("LAG %d chosen as the active LAG\n",
1572                         best->aggregator_identifier);
1573                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1574                         best->aggregator_identifier, best->num_of_ports,
1575                         best->actor_oper_aggregator_key,
1576                         best->partner_oper_aggregator_key,
1577                         best->is_individual, best->is_active);
1578
1579                 // disable the ports that were related to the former active_aggregator
1580                 if (active) {
1581                         for (port = active->lag_ports; port;
1582                              port = port->next_port_in_aggregator) {
1583                                 __disable_port(port);
1584                         }
1585                 }
1586         }
1587
1588         /*
1589          * if the selected aggregator is of join individuals
1590          * (partner_system is NULL), enable their ports
1591          */
1592         active = __get_active_agg(origin);
1593
1594         if (active) {
1595                 if (!__agg_has_partner(active)) {
1596                         for (port = active->lag_ports; port;
1597                              port = port->next_port_in_aggregator) {
1598                                 __enable_port(port);
1599                         }
1600                 }
1601         }
1602
1603         if (origin->slave) {
1604                 struct bonding *bond;
1605
1606                 bond = bond_get_bond_by_slave(origin->slave);
1607                 if (bond)
1608                         bond_3ad_set_carrier(bond);
1609         }
1610 }
1611
1612 /**
1613  * ad_clear_agg - clear a given aggregator's parameters
1614  * @aggregator: the aggregator we're looking at
1615  *
1616  */
1617 static void ad_clear_agg(struct aggregator *aggregator)
1618 {
1619         if (aggregator) {
1620                 aggregator->is_individual = false;
1621                 aggregator->actor_admin_aggregator_key = 0;
1622                 aggregator->actor_oper_aggregator_key = 0;
1623                 aggregator->partner_system = null_mac_addr;
1624                 aggregator->partner_system_priority = 0;
1625                 aggregator->partner_oper_aggregator_key = 0;
1626                 aggregator->receive_state = 0;
1627                 aggregator->transmit_state = 0;
1628                 aggregator->lag_ports = NULL;
1629                 aggregator->is_active = 0;
1630                 aggregator->num_of_ports = 0;
1631                 pr_debug("LAG %d was cleared\n", aggregator->aggregator_identifier);
1632         }
1633 }
1634
1635 /**
1636  * ad_initialize_agg - initialize a given aggregator's parameters
1637  * @aggregator: the aggregator we're looking at
1638  *
1639  */
1640 static void ad_initialize_agg(struct aggregator *aggregator)
1641 {
1642         if (aggregator) {
1643                 ad_clear_agg(aggregator);
1644
1645                 aggregator->aggregator_mac_address = null_mac_addr;
1646                 aggregator->aggregator_identifier = 0;
1647                 aggregator->slave = NULL;
1648         }
1649 }
1650
1651 /**
1652  * ad_initialize_port - initialize a given port's parameters
1653  * @aggregator: the aggregator we're looking at
1654  * @lacp_fast: boolean. whether fast periodic should be used
1655  *
1656  */
1657 static void ad_initialize_port(struct port *port, int lacp_fast)
1658 {
1659         static const struct port_params tmpl = {
1660                 .system_priority = 0xffff,
1661                 .key             = 1,
1662                 .port_number     = 1,
1663                 .port_priority   = 0xff,
1664                 .port_state      = 1,
1665         };
1666         static const struct lacpdu lacpdu = {
1667                 .subtype                = 0x01,
1668                 .version_number = 0x01,
1669                 .tlv_type_actor_info = 0x01,
1670                 .actor_information_length = 0x14,
1671                 .tlv_type_partner_info = 0x02,
1672                 .partner_information_length = 0x14,
1673                 .tlv_type_collector_info = 0x03,
1674                 .collector_information_length = 0x10,
1675                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1676         };
1677
1678         if (port) {
1679                 port->actor_port_number = 1;
1680                 port->actor_port_priority = 0xff;
1681                 port->actor_system = null_mac_addr;
1682                 port->actor_system_priority = 0xffff;
1683                 port->actor_port_aggregator_identifier = 0;
1684                 port->ntt = false;
1685                 port->actor_admin_port_key = 1;
1686                 port->actor_oper_port_key  = 1;
1687                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1688                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1689
1690                 if (lacp_fast) {
1691                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1692                 }
1693
1694                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1695                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1696
1697                 port->is_enabled = true;
1698                 // ****** private parameters ******
1699                 port->sm_vars = 0x3;
1700                 port->sm_rx_state = 0;
1701                 port->sm_rx_timer_counter = 0;
1702                 port->sm_periodic_state = 0;
1703                 port->sm_periodic_timer_counter = 0;
1704                 port->sm_mux_state = 0;
1705                 port->sm_mux_timer_counter = 0;
1706                 port->sm_tx_state = 0;
1707                 port->sm_tx_timer_counter = 0;
1708                 port->slave = NULL;
1709                 port->aggregator = NULL;
1710                 port->next_port_in_aggregator = NULL;
1711                 port->transaction_id = 0;
1712
1713                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1714         }
1715 }
1716
1717 /**
1718  * ad_enable_collecting_distributing - enable a port's transmit/receive
1719  * @port: the port we're looking at
1720  *
1721  * Enable @port if it's in an active aggregator
1722  */
1723 static void ad_enable_collecting_distributing(struct port *port)
1724 {
1725         if (port->aggregator->is_active) {
1726                 pr_debug("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1727                 __enable_port(port);
1728         }
1729 }
1730
1731 /**
1732  * ad_disable_collecting_distributing - disable a port's transmit/receive
1733  * @port: the port we're looking at
1734  *
1735  */
1736 static void ad_disable_collecting_distributing(struct port *port)
1737 {
1738         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1739                 pr_debug("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1740                 __disable_port(port);
1741         }
1742 }
1743
1744 #if 0
1745 /**
1746  * ad_marker_info_send - send a marker information frame
1747  * @port: the port we're looking at
1748  *
1749  * This function does nothing since we decided not to implement send and handle
1750  * response for marker PDU's, in this stage, but only to respond to marker
1751  * information.
1752  */
1753 static void ad_marker_info_send(struct port *port)
1754 {
1755         struct bond_marker marker;
1756         u16 index;
1757
1758         // fill the marker PDU with the appropriate values
1759         marker.subtype = 0x02;
1760         marker.version_number = 0x01;
1761         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1762         marker.marker_length = 0x16;
1763         // convert requester_port to Big Endian
1764         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1765         marker.requester_system = port->actor_system;
1766         // convert requester_port(u32) to Big Endian
1767         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1768         marker.pad = 0;
1769         marker.tlv_type_terminator = 0x00;
1770         marker.terminator_length = 0x00;
1771         for (index=0; index<90; index++) {
1772                 marker.reserved_90[index]=0;
1773         }
1774
1775         // send the marker information
1776         if (ad_marker_send(port, &marker) >= 0) {
1777                 pr_debug("Sent Marker Information on port %d\n", port->actor_port_number);
1778         }
1779 }
1780 #endif
1781
1782 /**
1783  * ad_marker_info_received - handle receive of a Marker information frame
1784  * @marker_info: Marker info received
1785  * @port: the port we're looking at
1786  *
1787  */
1788 static void ad_marker_info_received(struct bond_marker *marker_info,
1789         struct port *port)
1790 {
1791         struct bond_marker marker;
1792
1793         // copy the received marker data to the response marker
1794         //marker = *marker_info;
1795         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1796         // change the marker subtype to marker response
1797         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1798         // send the marker response
1799
1800         if (ad_marker_send(port, &marker) >= 0) {
1801                 pr_debug("Sent Marker Response on port %d\n", port->actor_port_number);
1802         }
1803 }
1804
1805 /**
1806  * ad_marker_response_received - handle receive of a marker response frame
1807  * @marker: marker PDU received
1808  * @port: the port we're looking at
1809  *
1810  * This function does nothing since we decided not to implement send and handle
1811  * response for marker PDU's, in this stage, but only to respond to marker
1812  * information.
1813  */
1814 static void ad_marker_response_received(struct bond_marker *marker,
1815         struct port *port)
1816 {
1817         marker=NULL; // just to satisfy the compiler
1818         port=NULL;  // just to satisfy the compiler
1819         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1820 }
1821
1822 //////////////////////////////////////////////////////////////////////////////////////
1823 // ================= AD exported functions to the main bonding code ==================
1824 //////////////////////////////////////////////////////////////////////////////////////
1825
1826 // Check aggregators status in team every T seconds
1827 #define AD_AGGREGATOR_SELECTION_TIMER  8
1828
1829 /*
1830  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1831  *
1832  * Set the aggregation selection timer, to initiate an agg selection in
1833  * the very near future.  Called during first initialization, and during
1834  * any down to up transitions of the bond.
1835  */
1836 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1837 {
1838         BOND_AD_INFO(bond).agg_select_timer = timeout;
1839         BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
1840 }
1841
1842 static u16 aggregator_identifier;
1843
1844 /**
1845  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1846  * @bond: bonding struct to work on
1847  * @tick_resolution: tick duration (millisecond resolution)
1848  * @lacp_fast: boolean. whether fast periodic should be used
1849  *
1850  * Can be called only after the mac address of the bond is set.
1851  */
1852 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1853 {
1854         // check that the bond is not initialized yet
1855         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr), &(bond->dev->dev_addr))) {
1856
1857                 aggregator_identifier = 0;
1858
1859                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1860                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1861                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1862
1863                 // initialize how many times this module is called in one second(should be about every 100ms)
1864                 ad_ticks_per_sec = tick_resolution;
1865
1866                 bond_3ad_initiate_agg_selection(bond,
1867                                                 AD_AGGREGATOR_SELECTION_TIMER *
1868                                                 ad_ticks_per_sec);
1869         }
1870 }
1871
1872 /**
1873  * bond_3ad_bind_slave - initialize a slave's port
1874  * @slave: slave struct to work on
1875  *
1876  * Returns:   0 on success
1877  *          < 0 on error
1878  */
1879 int bond_3ad_bind_slave(struct slave *slave)
1880 {
1881         struct bonding *bond = bond_get_bond_by_slave(slave);
1882         struct port *port;
1883         struct aggregator *aggregator;
1884
1885         if (bond == NULL) {
1886                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1887                        slave->dev->master->name, slave->dev->name);
1888                 return -1;
1889         }
1890
1891         //check that the slave has not been intialized yet.
1892         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1893
1894                 // port initialization
1895                 port = &(SLAVE_AD_INFO(slave).port);
1896
1897                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1898
1899                 port->slave = slave;
1900                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1901                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1902                 //              ------------------------------------------------------------
1903                 // Port key :   | User key                       |      Speed       |Duplex|
1904                 //              ------------------------------------------------------------
1905                 //              16                               6               1 0
1906                 port->actor_admin_port_key = 0; // initialize this parameter
1907                 port->actor_admin_port_key |= __get_duplex(port);
1908                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1909                 port->actor_oper_port_key = port->actor_admin_port_key;
1910                 // if the port is not full duplex, then the port should be not lacp Enabled
1911                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1912                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1913                 }
1914                 // actor system is the bond's system
1915                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1916                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1917                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1918                 port->aggregator = NULL;
1919                 port->next_port_in_aggregator = NULL;
1920
1921                 __disable_port(port);
1922                 __initialize_port_locks(port);
1923
1924
1925                 // aggregator initialization
1926                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1927
1928                 ad_initialize_agg(aggregator);
1929
1930                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1931                 aggregator->aggregator_identifier = (++aggregator_identifier);
1932                 aggregator->slave = slave;
1933                 aggregator->is_active = 0;
1934                 aggregator->num_of_ports = 0;
1935         }
1936
1937         return 0;
1938 }
1939
1940 /**
1941  * bond_3ad_unbind_slave - deinitialize a slave's port
1942  * @slave: slave struct to work on
1943  *
1944  * Search for the aggregator that is related to this port, remove the
1945  * aggregator and assign another aggregator for other port related to it
1946  * (if any), and remove the port.
1947  */
1948 void bond_3ad_unbind_slave(struct slave *slave)
1949 {
1950         struct port *port, *prev_port, *temp_port;
1951         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1952         int select_new_active_agg = 0;
1953
1954         // find the aggregator related to this slave
1955         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1956
1957         // find the port related to this slave
1958         port = &(SLAVE_AD_INFO(slave).port);
1959
1960         // if slave is null, the whole port is not initialized
1961         if (!port->slave) {
1962                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
1963                        "unbind an uninitialized port on %s\n",
1964                        slave->dev->master->name, slave->dev->name);
1965                 return;
1966         }
1967
1968         pr_debug("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1969
1970         /* Tell the partner that this port is not suitable for aggregation */
1971         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1972         __update_lacpdu_from_port(port);
1973         ad_lacpdu_send(port);
1974
1975         // check if this aggregator is occupied
1976         if (aggregator->lag_ports) {
1977                 // check if there are other ports related to this aggregator except
1978                 // the port related to this slave(thats ensure us that there is a
1979                 // reason to search for new aggregator, and that we will find one
1980                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1981                         // find new aggregator for the related port(s)
1982                         new_aggregator = __get_first_agg(port);
1983                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1984                                 // if the new aggregator is empty, or it connected to to our port only
1985                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1986                                         break;
1987                                 }
1988                         }
1989                         // if new aggregator found, copy the aggregator's parameters
1990                         // and connect the related lag_ports to the new aggregator
1991                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1992                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
1993
1994                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1995                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
1996                                                aggregator->slave->dev->master->name);
1997                                         // select new active aggregator
1998                                          select_new_active_agg = 1;
1999                                 }
2000
2001                                 new_aggregator->is_individual = aggregator->is_individual;
2002                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2003                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2004                                 new_aggregator->partner_system = aggregator->partner_system;
2005                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2006                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2007                                 new_aggregator->receive_state = aggregator->receive_state;
2008                                 new_aggregator->transmit_state = aggregator->transmit_state;
2009                                 new_aggregator->lag_ports = aggregator->lag_ports;
2010                                 new_aggregator->is_active = aggregator->is_active;
2011                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2012
2013                                 // update the information that is written on the ports about the aggregator
2014                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2015                                         temp_port->aggregator=new_aggregator;
2016                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2017                                 }
2018
2019                                 // clear the aggregator
2020                                 ad_clear_agg(aggregator);
2021
2022                                 if (select_new_active_agg) {
2023                                         ad_agg_selection_logic(__get_first_agg(port));
2024                                 }
2025                         } else {
2026                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2027                                        "and could not find a new aggregator for its ports\n",
2028                                        slave->dev->master->name);
2029                         }
2030                 } else { // in case that the only port related to this aggregator is the one we want to remove
2031                         select_new_active_agg = aggregator->is_active;
2032                         // clear the aggregator
2033                         ad_clear_agg(aggregator);
2034                         if (select_new_active_agg) {
2035                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2036                                        slave->dev->master->name);
2037                                 // select new active aggregator
2038                                 ad_agg_selection_logic(__get_first_agg(port));
2039                         }
2040                 }
2041         }
2042
2043         pr_debug("Unbinding port %d\n", port->actor_port_number);
2044         // find the aggregator that this port is connected to
2045         temp_aggregator = __get_first_agg(port);
2046         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2047                 prev_port = NULL;
2048                 // search the port in the aggregator's related ports
2049                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2050                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2051                                 if (prev_port) {
2052                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2053                                 } else {
2054                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2055                                 }
2056                                 temp_aggregator->num_of_ports--;
2057                                 if (temp_aggregator->num_of_ports==0) {
2058                                         select_new_active_agg = temp_aggregator->is_active;
2059                                         // clear the aggregator
2060                                         ad_clear_agg(temp_aggregator);
2061                                         if (select_new_active_agg) {
2062                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2063                                                        slave->dev->master->name);
2064                                                 // select new active aggregator
2065                                                 ad_agg_selection_logic(__get_first_agg(port));
2066                                         }
2067                                 }
2068                                 break;
2069                         }
2070                 }
2071         }
2072         port->slave=NULL;
2073 }
2074
2075 /**
2076  * bond_3ad_state_machine_handler - handle state machines timeout
2077  * @bond: bonding struct to work on
2078  *
2079  * The state machine handling concept in this module is to check every tick
2080  * which state machine should operate any function. The execution order is
2081  * round robin, so when we have an interaction between state machines, the
2082  * reply of one to each other might be delayed until next tick.
2083  *
2084  * This function also complete the initialization when the agg_select_timer
2085  * times out, and it selects an aggregator for the ports that are yet not
2086  * related to any aggregator, and selects the active aggregator for a bond.
2087  */
2088 void bond_3ad_state_machine_handler(struct work_struct *work)
2089 {
2090         struct bonding *bond = container_of(work, struct bonding,
2091                                             ad_work.work);
2092         struct port *port;
2093         struct aggregator *aggregator;
2094
2095         read_lock(&bond->lock);
2096
2097         if (bond->kill_timers) {
2098                 goto out;
2099         }
2100
2101         //check if there are any slaves
2102         if (bond->slave_cnt == 0) {
2103                 goto re_arm;
2104         }
2105
2106         // check if agg_select_timer timer after initialize is timed out
2107         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2108                 // select the active aggregator for the bond
2109                 if ((port = __get_first_port(bond))) {
2110                         if (!port->slave) {
2111                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2112                                        "uninitialized\n", bond->dev->name);
2113                                 goto re_arm;
2114                         }
2115
2116                         aggregator = __get_first_agg(port);
2117                         ad_agg_selection_logic(aggregator);
2118                 }
2119                 bond_3ad_set_carrier(bond);
2120         }
2121
2122         // for each port run the state machines
2123         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2124                 if (!port->slave) {
2125                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2126                                "port\n", bond->dev->name);
2127                         goto re_arm;
2128                 }
2129
2130                 ad_rx_machine(NULL, port);
2131                 ad_periodic_machine(port);
2132                 ad_port_selection_logic(port);
2133                 ad_mux_machine(port);
2134                 ad_tx_machine(port);
2135
2136                 // turn off the BEGIN bit, since we already handled it
2137                 if (port->sm_vars & AD_PORT_BEGIN) {
2138                         port->sm_vars &= ~AD_PORT_BEGIN;
2139                 }
2140         }
2141
2142 re_arm:
2143         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2144 out:
2145         read_unlock(&bond->lock);
2146 }
2147
2148 /**
2149  * bond_3ad_rx_indication - handle a received frame
2150  * @lacpdu: received lacpdu
2151  * @slave: slave struct to work on
2152  * @length: length of the data received
2153  *
2154  * It is assumed that frames that were sent on this NIC don't returned as new
2155  * received frames (loopback). Since only the payload is given to this
2156  * function, it check for loopback.
2157  */
2158 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2159 {
2160         struct port *port;
2161
2162         if (length >= sizeof(struct lacpdu)) {
2163
2164                 port = &(SLAVE_AD_INFO(slave).port);
2165
2166                 if (!port->slave) {
2167                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2168                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2169                         return;
2170                 }
2171
2172                 switch (lacpdu->subtype) {
2173                 case AD_TYPE_LACPDU:
2174                         pr_debug("Received LACPDU on port %d\n", port->actor_port_number);
2175                         ad_rx_machine(lacpdu, port);
2176                         break;
2177
2178                 case AD_TYPE_MARKER:
2179                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2180
2181                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2182                         case AD_MARKER_INFORMATION_SUBTYPE:
2183                                 pr_debug("Received Marker Information on port %d\n", port->actor_port_number);
2184                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2185                                 break;
2186
2187                         case AD_MARKER_RESPONSE_SUBTYPE:
2188                                 pr_debug("Received Marker Response on port %d\n", port->actor_port_number);
2189                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2190                                 break;
2191
2192                         default:
2193                                 pr_debug("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2194                         }
2195                 }
2196         }
2197 }
2198
2199 /**
2200  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2201  * @slave: slave struct to work on
2202  *
2203  * Handle reselection of aggregator (if needed) for this port.
2204  */
2205 void bond_3ad_adapter_speed_changed(struct slave *slave)
2206 {
2207         struct port *port;
2208
2209         port = &(SLAVE_AD_INFO(slave).port);
2210
2211         // if slave is null, the whole port is not initialized
2212         if (!port->slave) {
2213                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2214                        "changed for uninitialized port on %s\n",
2215                        slave->dev->master->name, slave->dev->name);
2216                 return;
2217         }
2218
2219         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2220         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2221         pr_debug("Port %d changed speed\n", port->actor_port_number);
2222         // there is no need to reselect a new aggregator, just signal the
2223         // state machines to reinitialize
2224         port->sm_vars |= AD_PORT_BEGIN;
2225 }
2226
2227 /**
2228  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2229  * @slave: slave struct to work on
2230  *
2231  * Handle reselection of aggregator (if needed) for this port.
2232  */
2233 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2234 {
2235         struct port *port;
2236
2237         port=&(SLAVE_AD_INFO(slave).port);
2238
2239         // if slave is null, the whole port is not initialized
2240         if (!port->slave) {
2241                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2242                        "for uninitialized port on %s\n",
2243                        slave->dev->master->name, slave->dev->name);
2244                 return;
2245         }
2246
2247         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2248         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2249         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2250         // there is no need to reselect a new aggregator, just signal the
2251         // state machines to reinitialize
2252         port->sm_vars |= AD_PORT_BEGIN;
2253 }
2254
2255 /**
2256  * bond_3ad_handle_link_change - handle a slave's link status change indication
2257  * @slave: slave struct to work on
2258  * @status: whether the link is now up or down
2259  *
2260  * Handle reselection of aggregator (if needed) for this port.
2261  */
2262 void bond_3ad_handle_link_change(struct slave *slave, char link)
2263 {
2264         struct port *port;
2265
2266         port = &(SLAVE_AD_INFO(slave).port);
2267
2268         // if slave is null, the whole port is not initialized
2269         if (!port->slave) {
2270                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2271                        "uninitialized port on %s\n",
2272                         slave->dev->master->name, slave->dev->name);
2273                 return;
2274         }
2275
2276         // 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)
2277         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2278         if (link == BOND_LINK_UP) {
2279                 port->is_enabled = true;
2280                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2281                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2282                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2283                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2284         } else {
2285                 /* link has failed */
2286                 port->is_enabled = false;
2287                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2288                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2289         }
2290         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2291         // there is no need to reselect a new aggregator, just signal the
2292         // state machines to reinitialize
2293         port->sm_vars |= AD_PORT_BEGIN;
2294 }
2295
2296 /*
2297  * set link state for bonding master: if we have an active
2298  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2299  * have an active aggregator if there are no slaves with link up.
2300  *
2301  * This behavior complies with IEEE 802.3 section 43.3.9.
2302  *
2303  * Called by bond_set_carrier(). Return zero if carrier state does not
2304  * change, nonzero if it does.
2305  */
2306 int bond_3ad_set_carrier(struct bonding *bond)
2307 {
2308         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2309                 if (!netif_carrier_ok(bond->dev)) {
2310                         netif_carrier_on(bond->dev);
2311                         return 1;
2312                 }
2313                 return 0;
2314         }
2315
2316         if (netif_carrier_ok(bond->dev)) {
2317                 netif_carrier_off(bond->dev);
2318                 return 1;
2319         }
2320         return 0;
2321 }
2322
2323 /**
2324  * bond_3ad_get_active_agg_info - get information of the active aggregator
2325  * @bond: bonding struct to work on
2326  * @ad_info: ad_info struct to fill with the bond's info
2327  *
2328  * Returns:   0 on success
2329  *          < 0 on error
2330  */
2331 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2332 {
2333         struct aggregator *aggregator = NULL;
2334         struct port *port;
2335
2336         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2337                 if (port->aggregator && port->aggregator->is_active) {
2338                         aggregator = port->aggregator;
2339                         break;
2340                 }
2341         }
2342
2343         if (aggregator) {
2344                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2345                 ad_info->ports = aggregator->num_of_ports;
2346                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2347                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2348                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2349                 return 0;
2350         }
2351
2352         return -1;
2353 }
2354
2355 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2356 {
2357         struct slave *slave, *start_at;
2358         struct bonding *bond = netdev_priv(dev);
2359         int slave_agg_no;
2360         int slaves_in_agg;
2361         int agg_id;
2362         int i;
2363         struct ad_info ad_info;
2364         int res = 1;
2365
2366         /* make sure that the slaves list will
2367          * not change during tx
2368          */
2369         read_lock(&bond->lock);
2370
2371         if (!BOND_IS_OK(bond)) {
2372                 goto out;
2373         }
2374
2375         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2376                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2377                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2378                 goto out;
2379         }
2380
2381         slaves_in_agg = ad_info.ports;
2382         agg_id = ad_info.aggregator_id;
2383
2384         if (slaves_in_agg == 0) {
2385                 /*the aggregator is empty*/
2386                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2387                        "aggregator is empty\n",
2388                        dev->name);
2389                 goto out;
2390         }
2391
2392         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2393
2394         bond_for_each_slave(bond, slave, i) {
2395                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2396
2397                 if (agg && (agg->aggregator_identifier == agg_id)) {
2398                         slave_agg_no--;
2399                         if (slave_agg_no < 0) {
2400                                 break;
2401                         }
2402                 }
2403         }
2404
2405         if (slave_agg_no >= 0) {
2406                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2407                        "for aggregator ID %d\n", dev->name, agg_id);
2408                 goto out;
2409         }
2410
2411         start_at = slave;
2412
2413         bond_for_each_slave_from(bond, slave, i, start_at) {
2414                 int slave_agg_id = 0;
2415                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2416
2417                 if (agg) {
2418                         slave_agg_id = agg->aggregator_identifier;
2419                 }
2420
2421                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2422                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2423                         break;
2424                 }
2425         }
2426
2427 out:
2428         if (res) {
2429                 /* no suitable interface, frame not sent */
2430                 dev_kfree_skb(skb);
2431         }
2432         read_unlock(&bond->lock);
2433         return 0;
2434 }
2435
2436 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2437 {
2438         struct bonding *bond = netdev_priv(dev);
2439         struct slave *slave = NULL;
2440         int ret = NET_RX_DROP;
2441
2442         if (dev_net(dev) != &init_net)
2443                 goto out;
2444
2445         if (!(dev->flags & IFF_MASTER))
2446                 goto out;
2447
2448         read_lock(&bond->lock);
2449         slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev),
2450                                         orig_dev);
2451         if (!slave)
2452                 goto out_unlock;
2453
2454         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2455
2456         ret = NET_RX_SUCCESS;
2457
2458 out_unlock:
2459         read_unlock(&bond->lock);
2460 out:
2461         dev_kfree_skb(skb);
2462
2463         return ret;
2464 }
2465