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 /**
1469  * ad_agg_selection_logic - select an aggregation group for a team
1470  * @aggregator: the aggregator we're looking at
1471  *
1472  * It is assumed that only one aggregator may be selected for a team.
1473  *
1474  * The logic of this function is to select the aggregator according to
1475  * the ad_select policy:
1476  *
1477  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1478  * it, and to reselect the active aggregator only if the previous
1479  * aggregator has no more ports related to it.
1480  *
1481  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1482  * bandwidth, and reselect whenever a link state change takes place or the
1483  * set of slaves in the bond changes.
1484  *
1485  * BOND_AD_COUNT: select the aggregator with largest number of ports
1486  * (slaves), and reselect whenever a link state change takes place or the
1487  * set of slaves in the bond changes.
1488  *
1489  * FIXME: this function MUST be called with the first agg in the bond, or
1490  * __get_active_agg() won't work correctly. This function should be better
1491  * called with the bond itself, and retrieve the first agg from it.
1492  */
1493 static void ad_agg_selection_logic(struct aggregator *agg)
1494 {
1495         struct aggregator *best, *active, *origin;
1496         struct port *port;
1497
1498         origin = agg;
1499
1500         active = __get_active_agg(agg);
1501         best = active;
1502
1503         do {
1504                 agg->is_active = 0;
1505
1506                 if (agg->num_of_ports)
1507                         best = ad_agg_selection_test(best, agg);
1508
1509         } while ((agg = __get_next_agg(agg)));
1510
1511         if (best &&
1512             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1513                 /*
1514                  * For the STABLE policy, don't replace the old active
1515                  * aggregator if it's still active (it has an answering
1516                  * partner) or if both the best and active don't have an
1517                  * answering partner.
1518                  */
1519                 if (active && active->lag_ports &&
1520                     active->lag_ports->is_enabled &&
1521                     (__agg_has_partner(active) ||
1522                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1523                         if (!(!active->actor_oper_aggregator_key &&
1524                               best->actor_oper_aggregator_key)) {
1525                                 best = NULL;
1526                                 active->is_active = 1;
1527                         }
1528                 }
1529         }
1530
1531         if (best && (best == active)) {
1532                 best = NULL;
1533                 active->is_active = 1;
1534         }
1535
1536         // if there is new best aggregator, activate it
1537         if (best) {
1538                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1539                        best->aggregator_identifier, best->num_of_ports,
1540                        best->actor_oper_aggregator_key,
1541                        best->partner_oper_aggregator_key,
1542                        best->is_individual, best->is_active);
1543                 pr_debug("best ports %p slave %p %s\n",
1544                        best->lag_ports, best->slave,
1545                        best->slave ? best->slave->dev->name : "NULL");
1546
1547                 for (agg = __get_first_agg(best->lag_ports); agg;
1548                      agg = __get_next_agg(agg)) {
1549
1550                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1551                                 agg->aggregator_identifier, agg->num_of_ports,
1552                                 agg->actor_oper_aggregator_key,
1553                                 agg->partner_oper_aggregator_key,
1554                                 agg->is_individual, agg->is_active);
1555                 }
1556
1557                 // check if any partner replys
1558                 if (best->is_individual) {
1559                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad"
1560                                " response from the link partner for any"
1561                                " adapters in the bond\n",
1562                                best->slave->dev->master->name);
1563                 }
1564
1565                 best->is_active = 1;
1566                 pr_debug("LAG %d chosen as the active LAG\n",
1567                         best->aggregator_identifier);
1568                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1569                         best->aggregator_identifier, best->num_of_ports,
1570                         best->actor_oper_aggregator_key,
1571                         best->partner_oper_aggregator_key,
1572                         best->is_individual, best->is_active);
1573
1574                 // disable the ports that were related to the former active_aggregator
1575                 if (active) {
1576                         for (port = active->lag_ports; port;
1577                              port = port->next_port_in_aggregator) {
1578                                 __disable_port(port);
1579                         }
1580                 }
1581         }
1582
1583         /*
1584          * if the selected aggregator is of join individuals
1585          * (partner_system is NULL), enable their ports
1586          */
1587         active = __get_active_agg(origin);
1588
1589         if (active) {
1590                 if (!__agg_has_partner(active)) {
1591                         for (port = active->lag_ports; port;
1592                              port = port->next_port_in_aggregator) {
1593                                 __enable_port(port);
1594                         }
1595                 }
1596         }
1597
1598         if (origin->slave) {
1599                 struct bonding *bond;
1600
1601                 bond = bond_get_bond_by_slave(origin->slave);
1602                 if (bond)
1603                         bond_3ad_set_carrier(bond);
1604         }
1605 }
1606
1607 /**
1608  * ad_clear_agg - clear a given aggregator's parameters
1609  * @aggregator: the aggregator we're looking at
1610  *
1611  */
1612 static void ad_clear_agg(struct aggregator *aggregator)
1613 {
1614         if (aggregator) {
1615                 aggregator->is_individual = false;
1616                 aggregator->actor_admin_aggregator_key = 0;
1617                 aggregator->actor_oper_aggregator_key = 0;
1618                 aggregator->partner_system = null_mac_addr;
1619                 aggregator->partner_system_priority = 0;
1620                 aggregator->partner_oper_aggregator_key = 0;
1621                 aggregator->receive_state = 0;
1622                 aggregator->transmit_state = 0;
1623                 aggregator->lag_ports = NULL;
1624                 aggregator->is_active = 0;
1625                 aggregator->num_of_ports = 0;
1626                 pr_debug("LAG %d was cleared\n", aggregator->aggregator_identifier);
1627         }
1628 }
1629
1630 /**
1631  * ad_initialize_agg - initialize a given aggregator's parameters
1632  * @aggregator: the aggregator we're looking at
1633  *
1634  */
1635 static void ad_initialize_agg(struct aggregator *aggregator)
1636 {
1637         if (aggregator) {
1638                 ad_clear_agg(aggregator);
1639
1640                 aggregator->aggregator_mac_address = null_mac_addr;
1641                 aggregator->aggregator_identifier = 0;
1642                 aggregator->slave = NULL;
1643         }
1644 }
1645
1646 /**
1647  * ad_initialize_port - initialize a given port's parameters
1648  * @aggregator: the aggregator we're looking at
1649  * @lacp_fast: boolean. whether fast periodic should be used
1650  *
1651  */
1652 static void ad_initialize_port(struct port *port, int lacp_fast)
1653 {
1654         static const struct port_params tmpl = {
1655                 .system_priority = 0xffff,
1656                 .key             = 1,
1657                 .port_number     = 1,
1658                 .port_priority   = 0xff,
1659                 .port_state      = 1,
1660         };
1661         static const struct lacpdu lacpdu = {
1662                 .subtype                = 0x01,
1663                 .version_number = 0x01,
1664                 .tlv_type_actor_info = 0x01,
1665                 .actor_information_length = 0x14,
1666                 .tlv_type_partner_info = 0x02,
1667                 .partner_information_length = 0x14,
1668                 .tlv_type_collector_info = 0x03,
1669                 .collector_information_length = 0x10,
1670                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1671         };
1672
1673         if (port) {
1674                 port->actor_port_number = 1;
1675                 port->actor_port_priority = 0xff;
1676                 port->actor_system = null_mac_addr;
1677                 port->actor_system_priority = 0xffff;
1678                 port->actor_port_aggregator_identifier = 0;
1679                 port->ntt = false;
1680                 port->actor_admin_port_key = 1;
1681                 port->actor_oper_port_key  = 1;
1682                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1683                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1684
1685                 if (lacp_fast) {
1686                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1687                 }
1688
1689                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1690                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1691
1692                 port->is_enabled = true;
1693                 // ****** private parameters ******
1694                 port->sm_vars = 0x3;
1695                 port->sm_rx_state = 0;
1696                 port->sm_rx_timer_counter = 0;
1697                 port->sm_periodic_state = 0;
1698                 port->sm_periodic_timer_counter = 0;
1699                 port->sm_mux_state = 0;
1700                 port->sm_mux_timer_counter = 0;
1701                 port->sm_tx_state = 0;
1702                 port->sm_tx_timer_counter = 0;
1703                 port->slave = NULL;
1704                 port->aggregator = NULL;
1705                 port->next_port_in_aggregator = NULL;
1706                 port->transaction_id = 0;
1707
1708                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1709         }
1710 }
1711
1712 /**
1713  * ad_enable_collecting_distributing - enable a port's transmit/receive
1714  * @port: the port we're looking at
1715  *
1716  * Enable @port if it's in an active aggregator
1717  */
1718 static void ad_enable_collecting_distributing(struct port *port)
1719 {
1720         if (port->aggregator->is_active) {
1721                 pr_debug("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1722                 __enable_port(port);
1723         }
1724 }
1725
1726 /**
1727  * ad_disable_collecting_distributing - disable a port's transmit/receive
1728  * @port: the port we're looking at
1729  *
1730  */
1731 static void ad_disable_collecting_distributing(struct port *port)
1732 {
1733         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1734                 pr_debug("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1735                 __disable_port(port);
1736         }
1737 }
1738
1739 #if 0
1740 /**
1741  * ad_marker_info_send - send a marker information frame
1742  * @port: the port we're looking at
1743  *
1744  * This function does nothing since we decided not to implement send and handle
1745  * response for marker PDU's, in this stage, but only to respond to marker
1746  * information.
1747  */
1748 static void ad_marker_info_send(struct port *port)
1749 {
1750         struct bond_marker marker;
1751         u16 index;
1752
1753         // fill the marker PDU with the appropriate values
1754         marker.subtype = 0x02;
1755         marker.version_number = 0x01;
1756         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1757         marker.marker_length = 0x16;
1758         // convert requester_port to Big Endian
1759         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1760         marker.requester_system = port->actor_system;
1761         // convert requester_port(u32) to Big Endian
1762         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1763         marker.pad = 0;
1764         marker.tlv_type_terminator = 0x00;
1765         marker.terminator_length = 0x00;
1766         for (index=0; index<90; index++) {
1767                 marker.reserved_90[index]=0;
1768         }
1769
1770         // send the marker information
1771         if (ad_marker_send(port, &marker) >= 0) {
1772                 pr_debug("Sent Marker Information on port %d\n", port->actor_port_number);
1773         }
1774 }
1775 #endif
1776
1777 /**
1778  * ad_marker_info_received - handle receive of a Marker information frame
1779  * @marker_info: Marker info received
1780  * @port: the port we're looking at
1781  *
1782  */
1783 static void ad_marker_info_received(struct bond_marker *marker_info,
1784         struct port *port)
1785 {
1786         struct bond_marker marker;
1787
1788         // copy the received marker data to the response marker
1789         //marker = *marker_info;
1790         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1791         // change the marker subtype to marker response
1792         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1793         // send the marker response
1794
1795         if (ad_marker_send(port, &marker) >= 0) {
1796                 pr_debug("Sent Marker Response on port %d\n", port->actor_port_number);
1797         }
1798 }
1799
1800 /**
1801  * ad_marker_response_received - handle receive of a marker response frame
1802  * @marker: marker PDU received
1803  * @port: the port we're looking at
1804  *
1805  * This function does nothing since we decided not to implement send and handle
1806  * response for marker PDU's, in this stage, but only to respond to marker
1807  * information.
1808  */
1809 static void ad_marker_response_received(struct bond_marker *marker,
1810         struct port *port)
1811 {
1812         marker=NULL; // just to satisfy the compiler
1813         port=NULL;  // just to satisfy the compiler
1814         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1815 }
1816
1817 //////////////////////////////////////////////////////////////////////////////////////
1818 // ================= AD exported functions to the main bonding code ==================
1819 //////////////////////////////////////////////////////////////////////////////////////
1820
1821 // Check aggregators status in team every T seconds
1822 #define AD_AGGREGATOR_SELECTION_TIMER  8
1823
1824 /*
1825  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1826  *
1827  * Set the aggregation selection timer, to initiate an agg selection in
1828  * the very near future.  Called during first initialization, and during
1829  * any down to up transitions of the bond.
1830  */
1831 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1832 {
1833         BOND_AD_INFO(bond).agg_select_timer = timeout;
1834         BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
1835 }
1836
1837 static u16 aggregator_identifier;
1838
1839 /**
1840  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1841  * @bond: bonding struct to work on
1842  * @tick_resolution: tick duration (millisecond resolution)
1843  * @lacp_fast: boolean. whether fast periodic should be used
1844  *
1845  * Can be called only after the mac address of the bond is set.
1846  */
1847 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1848 {
1849         // check that the bond is not initialized yet
1850         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr), &(bond->dev->dev_addr))) {
1851
1852                 aggregator_identifier = 0;
1853
1854                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1855                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1856                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1857
1858                 // initialize how many times this module is called in one second(should be about every 100ms)
1859                 ad_ticks_per_sec = tick_resolution;
1860
1861                 bond_3ad_initiate_agg_selection(bond,
1862                                                 AD_AGGREGATOR_SELECTION_TIMER *
1863                                                 ad_ticks_per_sec);
1864         }
1865 }
1866
1867 /**
1868  * bond_3ad_bind_slave - initialize a slave's port
1869  * @slave: slave struct to work on
1870  *
1871  * Returns:   0 on success
1872  *          < 0 on error
1873  */
1874 int bond_3ad_bind_slave(struct slave *slave)
1875 {
1876         struct bonding *bond = bond_get_bond_by_slave(slave);
1877         struct port *port;
1878         struct aggregator *aggregator;
1879
1880         if (bond == NULL) {
1881                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1882                        slave->dev->master->name, slave->dev->name);
1883                 return -1;
1884         }
1885
1886         //check that the slave has not been intialized yet.
1887         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1888
1889                 // port initialization
1890                 port = &(SLAVE_AD_INFO(slave).port);
1891
1892                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1893
1894                 port->slave = slave;
1895                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1896                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1897                 //              ------------------------------------------------------------
1898                 // Port key :   | User key                       |      Speed       |Duplex|
1899                 //              ------------------------------------------------------------
1900                 //              16                               6               1 0
1901                 port->actor_admin_port_key = 0; // initialize this parameter
1902                 port->actor_admin_port_key |= __get_duplex(port);
1903                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1904                 port->actor_oper_port_key = port->actor_admin_port_key;
1905                 // if the port is not full duplex, then the port should be not lacp Enabled
1906                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1907                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1908                 }
1909                 // actor system is the bond's system
1910                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1911                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1912                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1913                 port->aggregator = NULL;
1914                 port->next_port_in_aggregator = NULL;
1915
1916                 __disable_port(port);
1917                 __initialize_port_locks(port);
1918
1919
1920                 // aggregator initialization
1921                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1922
1923                 ad_initialize_agg(aggregator);
1924
1925                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1926                 aggregator->aggregator_identifier = (++aggregator_identifier);
1927                 aggregator->slave = slave;
1928                 aggregator->is_active = 0;
1929                 aggregator->num_of_ports = 0;
1930         }
1931
1932         return 0;
1933 }
1934
1935 /**
1936  * bond_3ad_unbind_slave - deinitialize a slave's port
1937  * @slave: slave struct to work on
1938  *
1939  * Search for the aggregator that is related to this port, remove the
1940  * aggregator and assign another aggregator for other port related to it
1941  * (if any), and remove the port.
1942  */
1943 void bond_3ad_unbind_slave(struct slave *slave)
1944 {
1945         struct port *port, *prev_port, *temp_port;
1946         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1947         int select_new_active_agg = 0;
1948
1949         // find the aggregator related to this slave
1950         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1951
1952         // find the port related to this slave
1953         port = &(SLAVE_AD_INFO(slave).port);
1954
1955         // if slave is null, the whole port is not initialized
1956         if (!port->slave) {
1957                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
1958                        "unbind an uninitialized port on %s\n",
1959                        slave->dev->master->name, slave->dev->name);
1960                 return;
1961         }
1962
1963         pr_debug("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1964
1965         /* Tell the partner that this port is not suitable for aggregation */
1966         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1967         __update_lacpdu_from_port(port);
1968         ad_lacpdu_send(port);
1969
1970         // check if this aggregator is occupied
1971         if (aggregator->lag_ports) {
1972                 // check if there are other ports related to this aggregator except
1973                 // the port related to this slave(thats ensure us that there is a
1974                 // reason to search for new aggregator, and that we will find one
1975                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1976                         // find new aggregator for the related port(s)
1977                         new_aggregator = __get_first_agg(port);
1978                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1979                                 // if the new aggregator is empty, or it connected to to our port only
1980                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1981                                         break;
1982                                 }
1983                         }
1984                         // if new aggregator found, copy the aggregator's parameters
1985                         // and connect the related lag_ports to the new aggregator
1986                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1987                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
1988
1989                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1990                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
1991                                                aggregator->slave->dev->master->name);
1992                                         // select new active aggregator
1993                                          select_new_active_agg = 1;
1994                                 }
1995
1996                                 new_aggregator->is_individual = aggregator->is_individual;
1997                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1998                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1999                                 new_aggregator->partner_system = aggregator->partner_system;
2000                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2001                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2002                                 new_aggregator->receive_state = aggregator->receive_state;
2003                                 new_aggregator->transmit_state = aggregator->transmit_state;
2004                                 new_aggregator->lag_ports = aggregator->lag_ports;
2005                                 new_aggregator->is_active = aggregator->is_active;
2006                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2007
2008                                 // update the information that is written on the ports about the aggregator
2009                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2010                                         temp_port->aggregator=new_aggregator;
2011                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2012                                 }
2013
2014                                 // clear the aggregator
2015                                 ad_clear_agg(aggregator);
2016
2017                                 if (select_new_active_agg) {
2018                                         ad_agg_selection_logic(__get_first_agg(port));
2019                                 }
2020                         } else {
2021                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2022                                        "and could not find a new aggregator for its ports\n",
2023                                        slave->dev->master->name);
2024                         }
2025                 } else { // in case that the only port related to this aggregator is the one we want to remove
2026                         select_new_active_agg = aggregator->is_active;
2027                         // clear the aggregator
2028                         ad_clear_agg(aggregator);
2029                         if (select_new_active_agg) {
2030                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2031                                        slave->dev->master->name);
2032                                 // select new active aggregator
2033                                 ad_agg_selection_logic(__get_first_agg(port));
2034                         }
2035                 }
2036         }
2037
2038         pr_debug("Unbinding port %d\n", port->actor_port_number);
2039         // find the aggregator that this port is connected to
2040         temp_aggregator = __get_first_agg(port);
2041         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2042                 prev_port = NULL;
2043                 // search the port in the aggregator's related ports
2044                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2045                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2046                                 if (prev_port) {
2047                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2048                                 } else {
2049                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2050                                 }
2051                                 temp_aggregator->num_of_ports--;
2052                                 if (temp_aggregator->num_of_ports==0) {
2053                                         select_new_active_agg = temp_aggregator->is_active;
2054                                         // clear the aggregator
2055                                         ad_clear_agg(temp_aggregator);
2056                                         if (select_new_active_agg) {
2057                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2058                                                        slave->dev->master->name);
2059                                                 // select new active aggregator
2060                                                 ad_agg_selection_logic(__get_first_agg(port));
2061                                         }
2062                                 }
2063                                 break;
2064                         }
2065                 }
2066         }
2067         port->slave=NULL;
2068 }
2069
2070 /**
2071  * bond_3ad_state_machine_handler - handle state machines timeout
2072  * @bond: bonding struct to work on
2073  *
2074  * The state machine handling concept in this module is to check every tick
2075  * which state machine should operate any function. The execution order is
2076  * round robin, so when we have an interaction between state machines, the
2077  * reply of one to each other might be delayed until next tick.
2078  *
2079  * This function also complete the initialization when the agg_select_timer
2080  * times out, and it selects an aggregator for the ports that are yet not
2081  * related to any aggregator, and selects the active aggregator for a bond.
2082  */
2083 void bond_3ad_state_machine_handler(struct work_struct *work)
2084 {
2085         struct bonding *bond = container_of(work, struct bonding,
2086                                             ad_work.work);
2087         struct port *port;
2088         struct aggregator *aggregator;
2089
2090         read_lock(&bond->lock);
2091
2092         if (bond->kill_timers) {
2093                 goto out;
2094         }
2095
2096         //check if there are any slaves
2097         if (bond->slave_cnt == 0) {
2098                 goto re_arm;
2099         }
2100
2101         // check if agg_select_timer timer after initialize is timed out
2102         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2103                 // select the active aggregator for the bond
2104                 if ((port = __get_first_port(bond))) {
2105                         if (!port->slave) {
2106                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2107                                        "uninitialized\n", bond->dev->name);
2108                                 goto re_arm;
2109                         }
2110
2111                         aggregator = __get_first_agg(port);
2112                         ad_agg_selection_logic(aggregator);
2113                 }
2114                 bond_3ad_set_carrier(bond);
2115         }
2116
2117         // for each port run the state machines
2118         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2119                 if (!port->slave) {
2120                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2121                                "port\n", bond->dev->name);
2122                         goto re_arm;
2123                 }
2124
2125                 ad_rx_machine(NULL, port);
2126                 ad_periodic_machine(port);
2127                 ad_port_selection_logic(port);
2128                 ad_mux_machine(port);
2129                 ad_tx_machine(port);
2130
2131                 // turn off the BEGIN bit, since we already handled it
2132                 if (port->sm_vars & AD_PORT_BEGIN) {
2133                         port->sm_vars &= ~AD_PORT_BEGIN;
2134                 }
2135         }
2136
2137 re_arm:
2138         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2139 out:
2140         read_unlock(&bond->lock);
2141 }
2142
2143 /**
2144  * bond_3ad_rx_indication - handle a received frame
2145  * @lacpdu: received lacpdu
2146  * @slave: slave struct to work on
2147  * @length: length of the data received
2148  *
2149  * It is assumed that frames that were sent on this NIC don't returned as new
2150  * received frames (loopback). Since only the payload is given to this
2151  * function, it check for loopback.
2152  */
2153 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2154 {
2155         struct port *port;
2156
2157         if (length >= sizeof(struct lacpdu)) {
2158
2159                 port = &(SLAVE_AD_INFO(slave).port);
2160
2161                 if (!port->slave) {
2162                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2163                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2164                         return;
2165                 }
2166
2167                 switch (lacpdu->subtype) {
2168                 case AD_TYPE_LACPDU:
2169                         pr_debug("Received LACPDU on port %d\n", port->actor_port_number);
2170                         ad_rx_machine(lacpdu, port);
2171                         break;
2172
2173                 case AD_TYPE_MARKER:
2174                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2175
2176                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2177                         case AD_MARKER_INFORMATION_SUBTYPE:
2178                                 pr_debug("Received Marker Information on port %d\n", port->actor_port_number);
2179                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2180                                 break;
2181
2182                         case AD_MARKER_RESPONSE_SUBTYPE:
2183                                 pr_debug("Received Marker Response on port %d\n", port->actor_port_number);
2184                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2185                                 break;
2186
2187                         default:
2188                                 pr_debug("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2189                         }
2190                 }
2191         }
2192 }
2193
2194 /**
2195  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2196  * @slave: slave struct to work on
2197  *
2198  * Handle reselection of aggregator (if needed) for this port.
2199  */
2200 void bond_3ad_adapter_speed_changed(struct slave *slave)
2201 {
2202         struct port *port;
2203
2204         port = &(SLAVE_AD_INFO(slave).port);
2205
2206         // if slave is null, the whole port is not initialized
2207         if (!port->slave) {
2208                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2209                        "changed for uninitialized port on %s\n",
2210                        slave->dev->master->name, slave->dev->name);
2211                 return;
2212         }
2213
2214         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2215         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2216         pr_debug("Port %d changed speed\n", port->actor_port_number);
2217         // there is no need to reselect a new aggregator, just signal the
2218         // state machines to reinitialize
2219         port->sm_vars |= AD_PORT_BEGIN;
2220 }
2221
2222 /**
2223  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2224  * @slave: slave struct to work on
2225  *
2226  * Handle reselection of aggregator (if needed) for this port.
2227  */
2228 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2229 {
2230         struct port *port;
2231
2232         port=&(SLAVE_AD_INFO(slave).port);
2233
2234         // if slave is null, the whole port is not initialized
2235         if (!port->slave) {
2236                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2237                        "for uninitialized port on %s\n",
2238                        slave->dev->master->name, slave->dev->name);
2239                 return;
2240         }
2241
2242         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2243         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2244         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2245         // there is no need to reselect a new aggregator, just signal the
2246         // state machines to reinitialize
2247         port->sm_vars |= AD_PORT_BEGIN;
2248 }
2249
2250 /**
2251  * bond_3ad_handle_link_change - handle a slave's link status change indication
2252  * @slave: slave struct to work on
2253  * @status: whether the link is now up or down
2254  *
2255  * Handle reselection of aggregator (if needed) for this port.
2256  */
2257 void bond_3ad_handle_link_change(struct slave *slave, char link)
2258 {
2259         struct port *port;
2260
2261         port = &(SLAVE_AD_INFO(slave).port);
2262
2263         // if slave is null, the whole port is not initialized
2264         if (!port->slave) {
2265                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2266                        "uninitialized port on %s\n",
2267                         slave->dev->master->name, slave->dev->name);
2268                 return;
2269         }
2270
2271         // 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)
2272         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2273         if (link == BOND_LINK_UP) {
2274                 port->is_enabled = true;
2275                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2276                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2277                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2278                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2279         } else {
2280                 /* link has failed */
2281                 port->is_enabled = false;
2282                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2283                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2284         }
2285         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2286         // there is no need to reselect a new aggregator, just signal the
2287         // state machines to reinitialize
2288         port->sm_vars |= AD_PORT_BEGIN;
2289 }
2290
2291 /*
2292  * set link state for bonding master: if we have an active
2293  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2294  * have an active aggregator if there are no slaves with link up.
2295  *
2296  * This behavior complies with IEEE 802.3 section 43.3.9.
2297  *
2298  * Called by bond_set_carrier(). Return zero if carrier state does not
2299  * change, nonzero if it does.
2300  */
2301 int bond_3ad_set_carrier(struct bonding *bond)
2302 {
2303         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2304                 if (!netif_carrier_ok(bond->dev)) {
2305                         netif_carrier_on(bond->dev);
2306                         return 1;
2307                 }
2308                 return 0;
2309         }
2310
2311         if (netif_carrier_ok(bond->dev)) {
2312                 netif_carrier_off(bond->dev);
2313                 return 1;
2314         }
2315         return 0;
2316 }
2317
2318 /**
2319  * bond_3ad_get_active_agg_info - get information of the active aggregator
2320  * @bond: bonding struct to work on
2321  * @ad_info: ad_info struct to fill with the bond's info
2322  *
2323  * Returns:   0 on success
2324  *          < 0 on error
2325  */
2326 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2327 {
2328         struct aggregator *aggregator = NULL;
2329         struct port *port;
2330
2331         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2332                 if (port->aggregator && port->aggregator->is_active) {
2333                         aggregator = port->aggregator;
2334                         break;
2335                 }
2336         }
2337
2338         if (aggregator) {
2339                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2340                 ad_info->ports = aggregator->num_of_ports;
2341                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2342                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2343                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2344                 return 0;
2345         }
2346
2347         return -1;
2348 }
2349
2350 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2351 {
2352         struct slave *slave, *start_at;
2353         struct bonding *bond = netdev_priv(dev);
2354         int slave_agg_no;
2355         int slaves_in_agg;
2356         int agg_id;
2357         int i;
2358         struct ad_info ad_info;
2359         int res = 1;
2360
2361         /* make sure that the slaves list will
2362          * not change during tx
2363          */
2364         read_lock(&bond->lock);
2365
2366         if (!BOND_IS_OK(bond)) {
2367                 goto out;
2368         }
2369
2370         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2371                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2372                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2373                 goto out;
2374         }
2375
2376         slaves_in_agg = ad_info.ports;
2377         agg_id = ad_info.aggregator_id;
2378
2379         if (slaves_in_agg == 0) {
2380                 /*the aggregator is empty*/
2381                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2382                        "aggregator is empty\n",
2383                        dev->name);
2384                 goto out;
2385         }
2386
2387         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2388
2389         bond_for_each_slave(bond, slave, i) {
2390                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2391
2392                 if (agg && (agg->aggregator_identifier == agg_id)) {
2393                         slave_agg_no--;
2394                         if (slave_agg_no < 0) {
2395                                 break;
2396                         }
2397                 }
2398         }
2399
2400         if (slave_agg_no >= 0) {
2401                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2402                        "for aggregator ID %d\n", dev->name, agg_id);
2403                 goto out;
2404         }
2405
2406         start_at = slave;
2407
2408         bond_for_each_slave_from(bond, slave, i, start_at) {
2409                 int slave_agg_id = 0;
2410                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2411
2412                 if (agg) {
2413                         slave_agg_id = agg->aggregator_identifier;
2414                 }
2415
2416                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2417                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2418                         break;
2419                 }
2420         }
2421
2422 out:
2423         if (res) {
2424                 /* no suitable interface, frame not sent */
2425                 dev_kfree_skb(skb);
2426         }
2427         read_unlock(&bond->lock);
2428         return 0;
2429 }
2430
2431 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2432 {
2433         struct bonding *bond = netdev_priv(dev);
2434         struct slave *slave = NULL;
2435         int ret = NET_RX_DROP;
2436
2437         if (dev_net(dev) != &init_net)
2438                 goto out;
2439
2440         if (!(dev->flags & IFF_MASTER))
2441                 goto out;
2442
2443         read_lock(&bond->lock);
2444         slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev),
2445                                         orig_dev);
2446         if (!slave)
2447                 goto out_unlock;
2448
2449         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2450
2451         ret = NET_RX_SUCCESS;
2452
2453 out_unlock:
2454         read_unlock(&bond->lock);
2455 out:
2456         dev_kfree_skb(skb);
2457
2458         return ret;
2459 }
2460