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 // ================= 3AD api to bonding and kernel code ==================
  99 static u16 __get_link_speed(struct port *port);
 100 static u8 __get_duplex(struct port *port);
 101 static inline void __initialize_port_locks(struct port *port);
 102 //conversions
 103 static u16 __ad_timer_to_ticks(u16 timer_type, u16 Par);
 104
 105
 106 // ================= ad code helper functions ==================
 107 //needed by ad_rx_machine(...)
 108 static void __record_pdu(struct lacpdu *lacpdu, struct port *port);
 109 static void __record_default(struct port *port);
 110 static void __update_selected(struct lacpdu *lacpdu, struct port *port);
 111 static void __update_default_selected(struct port *port);
 112 static void __choose_matched(struct lacpdu *lacpdu, struct port *port);
 113 static void __update_ntt(struct lacpdu *lacpdu, struct port *port);
 114
 115 //needed for ad_mux_machine(..)
 116 static void __attach_bond_to_agg(struct port *port);
 117 static void __detach_bond_from_agg(struct port *port);
 118 static int __agg_ports_are_ready(struct aggregator *aggregator);
 119 static void __set_agg_ports_ready(struct aggregator *aggregator, int val);
 120
 121 //needed for ad_agg_selection_logic(...)
 122 static u32 __get_agg_bandwidth(struct aggregator *aggregator);
 123 static struct aggregator *__get_active_agg(struct aggregator *aggregator);
 124
 125
 126 // ================= main 802.3ad protocol functions ==================
 127 static int ad_lacpdu_send(struct port *port);
 128 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 129 static void ad_mux_machine(struct port *port);
 130 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 131 static void ad_tx_machine(struct port *port);
 132 static void ad_periodic_machine(struct port *port);
 133 static void ad_port_selection_logic(struct port *port);
 134 static void ad_agg_selection_logic(struct aggregator *aggregator);
 135 static void ad_clear_agg(struct aggregator *aggregator);
 136 static void ad_initialize_agg(struct aggregator *aggregator);
 137 static void ad_initialize_port(struct port *port, int lacp_fast);
 138 static void ad_initialize_lacpdu(struct lacpdu *Lacpdu);
 139 static void ad_enable_collecting_distributing(struct port *port);
 140 static void ad_disable_collecting_distributing(struct port *port);
 141 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 142 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 143
 144
 145 /////////////////////////////////////////////////////////////////////////////////
 146 // ================= api to bonding and kernel code ==================
 147 /////////////////////////////////////////////////////////////////////////////////
 148
 149 /**
 150  * __get_bond_by_port - get the port's bonding struct
 151  * @port: the port we're looking at
 152  *
 153  * Return @port's bonding struct, or %NULL if it can't be found.
 154  */
 155 static inline struct bonding *__get_bond_by_port(struct port *port)
 156 {
 157         if (port->slave == NULL) {
 158                 return NULL;
 159         }
 160
 161         return bond_get_bond_by_slave(port->slave);
 162 }
 163
 164 /**
 165  * __get_first_port - get the first port in the bond
 166  * @bond: the bond we're looking at
 167  *
 168  * Return the port of the first slave in @bond, or %NULL if it can't be found.
 169  */
 170 static inline struct port *__get_first_port(struct bonding *bond)
 171 {
 172         if (bond->slave_cnt == 0) {
 173                 return NULL;
 174         }
 175
 176         return &(SLAVE_AD_INFO(bond->first_slave).port);
 177 }
 178
 179 /**
 180  * __get_next_port - get the next port in the bond
 181  * @port: the port we're looking at
 182  *
 183  * Return the port of the slave that is next in line of @port's slave in the
 184  * bond, or %NULL if it can't be found.
 185  */
 186 static inline struct port *__get_next_port(struct port *port)
 187 {
 188         struct bonding *bond = __get_bond_by_port(port);
 189         struct slave *slave = port->slave;
 190
 191         // If there's no bond for this port, or this is the last slave
 192         if ((bond == NULL) || (slave->next == bond->first_slave)) {
 193                 return NULL;
 194         }
 195
 196         return &(SLAVE_AD_INFO(slave->next).port);
 197 }
 198
 199 /**
 200  * __get_first_agg - get the first aggregator in the bond
 201  * @bond: the bond we're looking at
 202  *
 203  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 204  * found.
 205  */
 206 static inline struct aggregator *__get_first_agg(struct port *port)
 207 {
 208         struct bonding *bond = __get_bond_by_port(port);
 209
 210         // If there's no bond for this port, or bond has no slaves
 211         if ((bond == NULL) || (bond->slave_cnt == 0)) {
 212                 return NULL;
 213         }
 214
 215         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
 216 }
 217
 218 /**
 219  * __get_next_agg - get the next aggregator in the bond
 220  * @aggregator: the aggregator we're looking at
 221  *
 222  * Return the aggregator of the slave that is next in line of @aggregator's
 223  * slave in the bond, or %NULL if it can't be found.
 224  */
 225 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
 226 {
 227         struct slave *slave = aggregator->slave;
 228         struct bonding *bond = bond_get_bond_by_slave(slave);
 229
 230         // If there's no bond for this aggregator, or this is the last slave
 231         if ((bond == NULL) || (slave->next == bond->first_slave)) {
 232                 return NULL;
 233         }
 234
 235         return &(SLAVE_AD_INFO(slave->next).aggregator);
 236 }
 237
 238 /*
 239  * __agg_has_partner
 240  *
 241  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 242  * address for the partner).  Return 0 if not.
 243  */
 244 static inline int __agg_has_partner(struct aggregator *agg)
 245 {
 246         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 247 }
 248
 249 /**
 250  * __disable_port - disable the port's slave
 251  * @port: the port we're looking at
 252  *
 253  */
 254 static inline void __disable_port(struct port *port)
 255 {
 256         bond_set_slave_inactive_flags(port->slave);
 257 }
 258
 259 /**
 260  * __enable_port - enable the port's slave, if it's up
 261  * @port: the port we're looking at
 262  *
 263  */
 264 static inline void __enable_port(struct port *port)
 265 {
 266         struct slave *slave = port->slave;
 267
 268         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev)) {
 269                 bond_set_slave_active_flags(slave);
 270         }
 271 }
 272
 273 /**
 274  * __port_is_enabled - check if the port's slave is in active state
 275  * @port: the port we're looking at
 276  *
 277  */
 278 static inline int __port_is_enabled(struct port *port)
 279 {
 280         return(port->slave->state == BOND_STATE_ACTIVE);
 281 }
 282
 283 /**
 284  * __get_agg_selection_mode - get the aggregator selection mode
 285  * @port: the port we're looking at
 286  *
 287  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 288  */
 289 static inline u32 __get_agg_selection_mode(struct port *port)
 290 {
 291         struct bonding *bond = __get_bond_by_port(port);
 292
 293         if (bond == NULL) {
 294                 return BOND_AD_STABLE;
 295         }
 296
 297         return BOND_AD_INFO(bond).agg_select_mode;
 298 }
 299
 300 /**
 301  * __check_agg_selection_timer - check if the selection timer has expired
 302  * @port: the port we're looking at
 303  *
 304  */
 305 static inline int __check_agg_selection_timer(struct port *port)
 306 {
 307         struct bonding *bond = __get_bond_by_port(port);
 308
 309         if (bond == NULL) {
 310                 return 0;
 311         }
 312
 313         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 314 }
 315
 316 /**
 317  * __get_rx_machine_lock - lock the port's RX machine
 318  * @port: the port we're looking at
 319  *
 320  */
 321 static inline void __get_rx_machine_lock(struct port *port)
 322 {
 323         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 324 }
 325
 326 /**
 327  * __release_rx_machine_lock - unlock the port's RX machine
 328  * @port: the port we're looking at
 329  *
 330  */
 331 static inline void __release_rx_machine_lock(struct port *port)
 332 {
 333         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 334 }
 335
 336 /**
 337  * __get_link_speed - get a port's speed
 338  * @port: the port we're looking at
 339  *
 340  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 341  *     0,
 342  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 343  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 344  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 345  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 346  */
 347 static u16 __get_link_speed(struct port *port)
 348 {
 349         struct slave *slave = port->slave;
 350         u16 speed;
 351
 352         /* this if covers only a special case: when the configuration starts with
 353          * link down, it sets the speed to 0.
 354          * This is done in spite of the fact that the e100 driver reports 0 to be
 355          * compatible with MVT in the future.*/
 356         if (slave->link != BOND_LINK_UP) {
 357                 speed=0;
 358         } else {
 359                 switch (slave->speed) {
 360                 case SPEED_10:
 361                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 362                         break;
 363
 364                 case SPEED_100:
 365                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 366                         break;
 367
 368                 case SPEED_1000:
 369                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 370                         break;
 371
 372                 case SPEED_10000:
 373                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 374                         break;
 375
 376                 default:
 377                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 378                         break;
 379                 }
 380         }
 381
 382         pr_debug("Port %d Received link speed %d update from adapter\n", port->actor_port_number, speed);
 383         return speed;
 384 }
 385
 386 /**
 387  * __get_duplex - get a port's duplex
 388  * @port: the port we're looking at
 389  *
 390  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 391  *     0x01 if in full duplex
 392  *     0x00 otherwise
 393  */
 394 static u8 __get_duplex(struct port *port)
 395 {
 396         struct slave *slave = port->slave;
 397
 398         u8 retval;
 399
 400         //  handling a special case: when the configuration starts with
 401         // link down, it sets the duplex to 0.
 402         if (slave->link != BOND_LINK_UP) {
 403                 retval=0x0;
 404         } else {
 405                 switch (slave->duplex) {
 406                 case DUPLEX_FULL:
 407                         retval=0x1;
 408                         pr_debug("Port %d Received status full duplex update from adapter\n", port->actor_port_number);
 409                         break;
 410                 case DUPLEX_HALF:
 411                 default:
 412                         retval=0x0;
 413                         pr_debug("Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number);
 414                         break;
 415                 }
 416         }
 417         return retval;
 418 }
 419
 420 /**
 421  * __initialize_port_locks - initialize a port's RX machine spinlock
 422  * @port: the port we're looking at
 423  *
 424  */
 425 static inline void __initialize_port_locks(struct port *port)
 426 {
 427         // make sure it isn't called twice
 428         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 429 }
 430
 431 //conversions
 432
 433 /**
 434  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 435  * @timer_type: which timer to operate
 436  * @par: timer parameter. see below
 437  *
 438  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 439  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 440  *                                                  %SLOW_PERIODIC_TIME.
 441  */
 442 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 443 {
 444         u16 retval=0;    //to silence the compiler
 445
 446         switch (timer_type) {
 447         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 448                 if (par) {            // for short or long timeout
 449                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 450                 } else {
 451                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 452                 }
 453                 break;
 454         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 455                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 456                 break;
 457         case AD_PERIODIC_TIMER:     // for periodic machine
 458                 retval = (par*ad_ticks_per_sec); // long timeout
 459                 break;
 460         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 461                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 462                 break;
 463         case AD_WAIT_WHILE_TIMER:           // for selection machine
 464                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 465                 break;
 466         }
 467         return retval;
 468 }
 469
 470
 471 /////////////////////////////////////////////////////////////////////////////////
 472 // ================= ad_rx_machine helper functions ==================
 473 /////////////////////////////////////////////////////////////////////////////////
 474
 475 /**
 476  * __record_pdu - record parameters from a received lacpdu
 477  * @lacpdu: the lacpdu we've received
 478  * @port: the port we're looking at
 479  *
 480  * Record the parameter values for the Actor carried in a received lacpdu as
 481  * the current partner operational parameter values and sets
 482  * actor_oper_port_state.defaulted to FALSE.
 483  */
 484 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 485 {
 486         if (lacpdu && port) {
 487                 struct port_params *partner = &port->partner_oper;
 488
 489                 // record the new parameter values for the partner operational
 490                 partner->port_number = ntohs(lacpdu->actor_port);
 491                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 492                 partner->system = lacpdu->actor_system;
 493                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 494                 partner->key = ntohs(lacpdu->actor_key);
 495                 partner->port_state = lacpdu->actor_state;
 496
 497                 // set actor_oper_port_state.defaulted to FALSE
 498                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 499
 500                 // set the partner sync. to on if the partner is sync. and the port is matched
 501                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 502                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 503                 } else {
 504                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 505                 }
 506         }
 507 }
 508
 509 /**
 510  * __record_default - record default parameters
 511  * @port: the port we're looking at
 512  *
 513  * This function records the default parameter values for the partner carried
 514  * in the Partner Admin parameters as the current partner operational parameter
 515  * values and sets actor_oper_port_state.defaulted to TRUE.
 516  */
 517 static void __record_default(struct port *port)
 518 {
 519         // validate the port
 520         if (port) {
 521                 // record the partner admin parameters
 522                 port->partner_oper.port_number = port->partner_admin.port_number;
 523                 port->partner_oper.port_priority = port->partner_admin.port_priority;
 524                 port->partner_oper.system = port->partner_admin.system;
 525                 port->partner_oper.system_priority = port->partner_admin.system_priority;
 526                 port->partner_oper.key = port->partner_admin.key;
 527                 port->partner_oper.port_state = port->partner_admin.port_state;
 528
 529                 // set actor_oper_port_state.defaulted to true
 530                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 531         }
 532 }
 533
 534 /**
 535  * __update_selected - update a port's Selected variable from a received lacpdu
 536  * @lacpdu: the lacpdu we've received
 537  * @port: the port we're looking at
 538  *
 539  * Update the value of the selected variable, using parameter values from a
 540  * newly received lacpdu. The parameter values for the Actor carried in the
 541  * received PDU are compared with the corresponding operational parameter
 542  * values for the ports partner. If one or more of the comparisons shows that
 543  * the value(s) received in the PDU differ from the current operational values,
 544  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 545  * set to out_of_sync. Otherwise, selected remains unchanged.
 546  */
 547 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 548 {
 549         // validate lacpdu and port
 550         if (lacpdu && port) {
 551                 // check if any parameter is different
 552                 if ((ntohs(lacpdu->actor_port) != port->partner_oper.port_number) ||
 553                     (ntohs(lacpdu->actor_port_priority) != port->partner_oper.port_priority) ||
 554                     MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->partner_oper.system)) ||
 555                     (ntohs(lacpdu->actor_system_priority) != port->partner_oper.system_priority) ||
 556                     (ntohs(lacpdu->actor_key) != port->partner_oper.key) ||
 557                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) != (port->partner_oper.port_state & AD_STATE_AGGREGATION))
 558                    ) {
 559                         // update the state machine Selected variable
 560                         port->sm_vars &= ~AD_PORT_SELECTED;
 561                 }
 562         }
 563 }
 564
 565 /**
 566  * __update_default_selected - update a port's Selected variable from Partner
 567  * @port: the port we're looking at
 568  *
 569  * This function updates the value of the selected variable, using the partner
 570  * administrative parameter values. The administrative values are compared with
 571  * the corresponding operational parameter values for the partner. If one or
 572  * more of the comparisons shows that the administrative value(s) differ from
 573  * the current operational values, then Selected is set to FALSE and
 574  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 575  * Selected remains unchanged.
 576  */
 577 static void __update_default_selected(struct port *port)
 578 {
 579         // validate the port
 580         if (port) {
 581                 // check if any parameter is different
 582                 if ((port->partner_admin.port_number != port->partner_oper.port_number) ||
 583                     (port->partner_admin.port_priority != port->partner_oper.port_priority) ||
 584                     MAC_ADDRESS_COMPARE(&(port->partner_admin.system), &(port->partner_oper.system)) ||
 585                     (port->partner_admin.system_priority != port->partner_oper.system_priority) ||
 586                     (port->partner_admin.key != port->partner_oper.key) ||
 587                     ((port->partner_admin.port_state & AD_STATE_AGGREGATION) != (port->partner_oper.port_state & AD_STATE_AGGREGATION))
 588                    ) {
 589                         // update the state machine Selected variable
 590                         port->sm_vars &= ~AD_PORT_SELECTED;
 591                 }
 592         }
 593 }
 594
 595 /**
 596  * __choose_matched - update a port's matched variable from a received lacpdu
 597  * @lacpdu: the lacpdu we've received
 598  * @port: the port we're looking at
 599  *
 600  * Update the value of the matched variable, using parameter values from a
 601  * newly received lacpdu. Parameter values for the partner carried in the
 602  * received PDU are compared with the corresponding operational parameter
 603  * values for the actor. Matched is set to TRUE if all of these parameters
 604  * match and the PDU parameter partner_state.aggregation has the same value as
 605  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 606  * in the aggregation. Matched is also set to TRUE if the value of
 607  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 608  * an individual link and lacp will actively maintain the link. Otherwise,
 609  * matched is set to FALSE. LACP is considered to be actively maintaining the
 610  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 611  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 612  * partner_state.lacp_activity variables are TRUE.
 613  */
 614 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 615 {
 616         // validate lacpdu and port
 617         if (lacpdu && port) {
 618                 // check if all parameters are alike
 619                 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 620                      (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 621                      !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 622                      (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 623                      (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 624                      ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 625                     // or this is individual link(aggregation == FALSE)
 626                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 627                    ) {
 628                         // update the state machine Matched variable
 629                         port->sm_vars |= AD_PORT_MATCHED;
 630                 } else {
 631                         port->sm_vars &= ~AD_PORT_MATCHED;
 632                 }
 633         }
 634 }
 635
 636 /**
 637  * __update_ntt - update a port's ntt variable from a received lacpdu
 638  * @lacpdu: the lacpdu we've received
 639  * @port: the port we're looking at
 640  *
 641  * Updates the value of the ntt variable, using parameter values from a newly
 642  * received lacpdu. The parameter values for the partner carried in the
 643  * received PDU are compared with the corresponding operational parameter
 644  * values for the Actor. If one or more of the comparisons shows that the
 645  * value(s) received in the PDU differ from the current operational values,
 646  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 647  */
 648 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 649 {
 650         // validate lacpdu and port
 651         if (lacpdu && port) {
 652                 // check if any parameter is different
 653                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 654                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 655                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 656                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 657                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 658                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 659                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 660                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 661                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 662                    ) {
 663                         // set ntt to be TRUE
 664                         port->ntt = 1;
 665                 }
 666         }
 667 }
 668
 669 /**
 670  * __attach_bond_to_agg
 671  * @port: the port we're looking at
 672  *
 673  * Handle the attaching of the port's control parser/multiplexer and the
 674  * aggregator. This function does nothing since the parser/multiplexer of the
 675  * receive and the parser/multiplexer of the aggregator are already combined.
 676  */
 677 static void __attach_bond_to_agg(struct port *port)
 678 {
 679         port=NULL; // just to satisfy the compiler
 680         // This function does nothing since the parser/multiplexer of the receive
 681         // and the parser/multiplexer of the aggregator are already combined
 682 }
 683
 684 /**
 685  * __detach_bond_from_agg
 686  * @port: the port we're looking at
 687  *
 688  * Handle the detaching of the port's control parser/multiplexer from the
 689  * aggregator. This function does nothing since the parser/multiplexer of the
 690  * receive and the parser/multiplexer of the aggregator are already combined.
 691  */
 692 static void __detach_bond_from_agg(struct port *port)
 693 {
 694         port=NULL; // just to satisfy the compiler
 695         // This function does nothing sience the parser/multiplexer of the receive
 696         // and the parser/multiplexer of the aggregator are already combined
 697 }
 698
 699 /**
 700  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 701  * @aggregator: the aggregator we're looking at
 702  *
 703  */
 704 static int __agg_ports_are_ready(struct aggregator *aggregator)
 705 {
 706         struct port *port;
 707         int retval = 1;
 708
 709         if (aggregator) {
 710                 // scan all ports in this aggregator to verfy if they are all ready
 711                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 712                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 713                                 retval = 0;
 714                                 break;
 715                         }
 716                 }
 717         }
 718
 719         return retval;
 720 }
 721
 722 /**
 723  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 724  * @aggregator: the aggregator we're looking at
 725  * @val: Should the ports' ready bit be set on or off
 726  *
 727  */
 728 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 729 {
 730         struct port *port;
 731
 732         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 733                 if (val) {
 734                         port->sm_vars |= AD_PORT_READY;
 735                 } else {
 736                         port->sm_vars &= ~AD_PORT_READY;
 737                 }
 738         }
 739 }
 740
 741 /**
 742  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 743  * @aggregator: the aggregator we're looking at
 744  *
 745  */
 746 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 747 {
 748         u32 bandwidth=0;
 749         u32 basic_speed;
 750
 751         if (aggregator->num_of_ports) {
 752                 basic_speed = __get_link_speed(aggregator->lag_ports);
 753                 switch (basic_speed) {
 754                 case AD_LINK_SPEED_BITMASK_1MBPS:
 755                         bandwidth = aggregator->num_of_ports;
 756                         break;
 757                 case AD_LINK_SPEED_BITMASK_10MBPS:
 758                         bandwidth = aggregator->num_of_ports * 10;
 759                         break;
 760                 case AD_LINK_SPEED_BITMASK_100MBPS:
 761                         bandwidth = aggregator->num_of_ports * 100;
 762                         break;
 763                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 764                         bandwidth = aggregator->num_of_ports * 1000;
 765                         break;
 766                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 767                         bandwidth = aggregator->num_of_ports * 10000;
 768                         break;
 769                 default:
 770                         bandwidth=0; // to silent the compilor ....
 771                 }
 772         }
 773         return bandwidth;
 774 }
 775
 776 /**
 777  * __get_active_agg - get the current active aggregator
 778  * @aggregator: the aggregator we're looking at
 779  *
 780  */
 781 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 782 {
 783         struct aggregator *retval = NULL;
 784
 785         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 786                 if (aggregator->is_active) {
 787                         retval = aggregator;
 788                         break;
 789                 }
 790         }
 791
 792         return retval;
 793 }
 794
 795 /**
 796  * __update_lacpdu_from_port - update a port's lacpdu fields
 797  * @port: the port we're looking at
 798  *
 799  */
 800 static inline void __update_lacpdu_from_port(struct port *port)
 801 {
 802         struct lacpdu *lacpdu = &port->lacpdu;
 803
 804         /* update current actual Actor parameters */
 805         /* lacpdu->subtype                   initialized
 806          * lacpdu->version_number            initialized
 807          * lacpdu->tlv_type_actor_info       initialized
 808          * lacpdu->actor_information_length  initialized
 809          */
 810
 811         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 812         lacpdu->actor_system = port->actor_system;
 813         lacpdu->actor_key = htons(port->actor_oper_port_key);
 814         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 815         lacpdu->actor_port = htons(port->actor_port_number);
 816         lacpdu->actor_state = port->actor_oper_port_state;
 817
 818         /* lacpdu->reserved_3_1              initialized
 819          * lacpdu->tlv_type_partner_info     initialized
 820          * lacpdu->partner_information_length initialized
 821          */
 822
 823         lacpdu->partner_system_priority = htons(port->partner_oper.system_priority);
 824         lacpdu->partner_system = port->partner_oper.system;
 825         lacpdu->partner_key = htons(port->partner_oper.key);
 826         lacpdu->partner_port_priority = htons(port->partner_oper.port_priority);
 827         lacpdu->partner_port = htons(port->partner_oper.port_number);
 828         lacpdu->partner_state = port->partner_oper.port_state;
 829
 830         /* lacpdu->reserved_3_2              initialized
 831          * lacpdu->tlv_type_collector_info   initialized
 832          * lacpdu->collector_information_length initialized
 833          * collector_max_delay                initialized
 834          * reserved_12[12]                   initialized
 835          * tlv_type_terminator               initialized
 836          * terminator_length                 initialized
 837          * reserved_50[50]                   initialized
 838          */
 839 }
 840
 841 //////////////////////////////////////////////////////////////////////////////////////
 842 // ================= main 802.3ad protocol code ======================================
 843 //////////////////////////////////////////////////////////////////////////////////////
 844
 845 /**
 846  * ad_lacpdu_send - send out a lacpdu packet on a given port
 847  * @port: the port we're looking at
 848  *
 849  * Returns:   0 on success
 850  *          < 0 on error
 851  */
 852 static int ad_lacpdu_send(struct port *port)
 853 {
 854         struct slave *slave = port->slave;
 855         struct sk_buff *skb;
 856         struct lacpdu_header *lacpdu_header;
 857         int length = sizeof(struct lacpdu_header);
 858         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 859
 860         skb = dev_alloc_skb(length);
 861         if (!skb) {
 862                 return -ENOMEM;
 863         }
 864
 865         skb->dev = slave->dev;
 866         skb_reset_mac_header(skb);
 867         skb->network_header = skb->mac_header + ETH_HLEN;
 868         skb->protocol = PKT_TYPE_LACPDU;
 869         skb->priority = TC_PRIO_CONTROL;
 870
 871         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 872
 873         lacpdu_header->ad_header.destination_address = lacpdu_multicast_address;
 874         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 875            to identify loopback lacpdus in receive. */
 876         lacpdu_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 877         lacpdu_header->ad_header.length_type = PKT_TYPE_LACPDU;
 878
 879         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 880
 881         dev_queue_xmit(skb);
 882
 883         return 0;
 884 }
 885
 886 /**
 887  * ad_marker_send - send marker information/response on a given port
 888  * @port: the port we're looking at
 889  * @marker: marker data to send
 890  *
 891  * Returns:   0 on success
 892  *          < 0 on error
 893  */
 894 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 895 {
 896         struct slave *slave = port->slave;
 897         struct sk_buff *skb;
 898         struct bond_marker_header *marker_header;
 899         int length = sizeof(struct bond_marker_header);
 900         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 901
 902         skb = dev_alloc_skb(length + 16);
 903         if (!skb) {
 904                 return -ENOMEM;
 905         }
 906
 907         skb_reserve(skb, 16);
 908
 909         skb->dev = slave->dev;
 910         skb_reset_mac_header(skb);
 911         skb->network_header = skb->mac_header + ETH_HLEN;
 912         skb->protocol = PKT_TYPE_LACPDU;
 913
 914         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 915
 916         marker_header->ad_header.destination_address = lacpdu_multicast_address;
 917         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 918            to identify loopback MARKERs in receive. */
 919         marker_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 920         marker_header->ad_header.length_type = PKT_TYPE_LACPDU;
 921
 922         marker_header->marker = *marker; // struct copy
 923
 924         dev_queue_xmit(skb);
 925
 926         return 0;
 927 }
 928
 929 /**
 930  * ad_mux_machine - handle a port's mux state machine
 931  * @port: the port we're looking at
 932  *
 933  */
 934 static void ad_mux_machine(struct port *port)
 935 {
 936         mux_states_t last_state;
 937
 938         // keep current State Machine state to compare later if it was changed
 939         last_state = port->sm_mux_state;
 940
 941         if (port->sm_vars & AD_PORT_BEGIN) {
 942                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 943         } else {
 944                 switch (port->sm_mux_state) {
 945                 case AD_MUX_DETACHED:
 946                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
 947                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 948                         }
 949                         break;
 950                 case AD_MUX_WAITING:
 951                         // if SELECTED == FALSE return to DETACH state
 952                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 953                                 port->sm_vars &= ~AD_PORT_READY_N;
 954                                 // in order to withhold the Selection Logic to check all ports READY_N value
 955                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 956                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 957                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 958                                 break;
 959                         }
 960
 961                         // check if the wait_while_timer expired
 962                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
 963                                 port->sm_vars |= AD_PORT_READY_N;
 964                         }
 965
 966                         // in order to withhold the selection logic to check all ports READY_N value
 967                         // every callback cycle to update ready variable, we check READY_N and update READY here
 968                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 969
 970                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 971                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
 972                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 973                         }
 974                         break;
 975                 case AD_MUX_ATTACHED:
 976                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 977                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 978                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 979                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 980                                 port->sm_vars &= ~AD_PORT_READY_N;
 981                                 // in order to withhold the selection logic to check all ports READY_N value
 982                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 983                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 984                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 985                         }
 986                         break;
 987                 case AD_MUX_COLLECTING_DISTRIBUTING:
 988                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 989                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 990                            ) {
 991                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 992
 993                         } else {
 994                                 // if port state hasn't changed make
 995                                 // sure that a collecting distributing
 996                                 // port in an active aggregator is enabled
 997                                 if (port->aggregator &&
 998                                     port->aggregator->is_active &&
 999                                     !__port_is_enabled(port)) {
1000
1001                                         __enable_port(port);
1002                                 }
1003                         }
1004                         break;
1005                 default:    //to silence the compiler
1006                         break;
1007                 }
1008         }
1009
1010         // check if the state machine was changed
1011         if (port->sm_mux_state != last_state) {
1012                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
1013                 switch (port->sm_mux_state) {
1014                 case AD_MUX_DETACHED:
1015                         __detach_bond_from_agg(port);
1016                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1017                         ad_disable_collecting_distributing(port);
1018                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1019                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1020                         port->ntt = 1;
1021                         break;
1022                 case AD_MUX_WAITING:
1023                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1024                         break;
1025                 case AD_MUX_ATTACHED:
1026                         __attach_bond_to_agg(port);
1027                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1028                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1029                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1030                         ad_disable_collecting_distributing(port);
1031                         port->ntt = 1;
1032                         break;
1033                 case AD_MUX_COLLECTING_DISTRIBUTING:
1034                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1035                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1036                         ad_enable_collecting_distributing(port);
1037                         port->ntt = 1;
1038                         break;
1039                 default:    //to silence the compiler
1040                         break;
1041                 }
1042         }
1043 }
1044
1045 /**
1046  * ad_rx_machine - handle a port's rx State Machine
1047  * @lacpdu: the lacpdu we've received
1048  * @port: the port we're looking at
1049  *
1050  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1051  * CURRENT. If timer expired set the state machine in the proper state.
1052  * In other cases, this function checks if we need to switch to other state.
1053  */
1054 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1055 {
1056         rx_states_t last_state;
1057
1058         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1059         __get_rx_machine_lock(port);
1060
1061         // keep current State Machine state to compare later if it was changed
1062         last_state = port->sm_rx_state;
1063
1064         // check if state machine should change state
1065         // first, check if port was reinitialized
1066         if (port->sm_vars & AD_PORT_BEGIN) {
1067                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1068         }
1069         // check if port is not enabled
1070         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1071                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1072         }
1073         // check if new lacpdu arrived
1074         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1075                 port->sm_rx_timer_counter = 0; // zero timer
1076                 port->sm_rx_state = AD_RX_CURRENT;
1077         } else {
1078                 // if timer is on, and if it is expired
1079                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1080                         switch (port->sm_rx_state) {
1081                         case AD_RX_EXPIRED:
1082                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1083                                 break;
1084                         case AD_RX_CURRENT:
1085                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1086                                 break;
1087                         default:    //to silence the compiler
1088                                 break;
1089                         }
1090                 } else {
1091                         // if no lacpdu arrived and no timer is on
1092                         switch (port->sm_rx_state) {
1093                         case AD_RX_PORT_DISABLED:
1094                                 if (port->sm_vars & AD_PORT_MOVED) {
1095                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1096                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1097                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1098                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1099                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1100                                 }
1101                                 break;
1102                         default:    //to silence the compiler
1103                                 break;
1104
1105                         }
1106                 }
1107         }
1108
1109         // check if the State machine was changed or new lacpdu arrived
1110         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1111                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_rx_state);
1112                 switch (port->sm_rx_state) {
1113                 case AD_RX_INITIALIZE:
1114                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1115                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1116                         } else {
1117                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1118                         }
1119                         port->sm_vars &= ~AD_PORT_SELECTED;
1120                         __record_default(port);
1121                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1122                         port->sm_vars &= ~AD_PORT_MOVED;
1123                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1124
1125                         /*- Fall Through -*/
1126
1127                 case AD_RX_PORT_DISABLED:
1128                         port->sm_vars &= ~AD_PORT_MATCHED;
1129                         break;
1130                 case AD_RX_LACP_DISABLED:
1131                         port->sm_vars &= ~AD_PORT_SELECTED;
1132                         __record_default(port);
1133                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1134                         port->sm_vars |= AD_PORT_MATCHED;
1135                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1136                         break;
1137                 case AD_RX_EXPIRED:
1138                         //Reset of the Synchronization flag. (Standard 43.4.12)
1139                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1140                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1141                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1142                         port->sm_vars &= ~AD_PORT_MATCHED;
1143                         port->partner_oper.port_state |= AD_SHORT_TIMEOUT;
1144                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1145                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1146                         break;
1147                 case AD_RX_DEFAULTED:
1148                         __update_default_selected(port);
1149                         __record_default(port);
1150                         port->sm_vars |= AD_PORT_MATCHED;
1151                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1152                         break;
1153                 case AD_RX_CURRENT:
1154                         // detect loopback situation
1155                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1156                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1157                                 printk(KERN_ERR DRV_NAME ": %s: An illegal loopback occurred on "
1158                                        "adapter (%s). Check the configuration to verify that all "
1159                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1160                                        port->slave->dev->master->name, port->slave->dev->name);
1161                                 __release_rx_machine_lock(port);
1162                                 return;
1163                         }
1164                         __update_selected(lacpdu, port);
1165                         __update_ntt(lacpdu, port);
1166                         __record_pdu(lacpdu, port);
1167                         __choose_matched(lacpdu, port);
1168                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1169                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1170                         // verify that if the aggregator is enabled, the port is enabled too.
1171                         //(because if the link goes down for a short time, the 802.3ad will not
1172                         // catch it, and the port will continue to be disabled)
1173                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1174                                 __enable_port(port);
1175                         }
1176                         break;
1177                 default:    //to silence the compiler
1178                         break;
1179                 }
1180         }
1181         __release_rx_machine_lock(port);
1182 }
1183
1184 /**
1185  * ad_tx_machine - handle a port's tx state machine
1186  * @port: the port we're looking at
1187  *
1188  */
1189 static void ad_tx_machine(struct port *port)
1190 {
1191         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1192         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1193                 // check if there is something to send
1194                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1195                         __update_lacpdu_from_port(port);
1196                         // send the lacpdu
1197                         if (ad_lacpdu_send(port) >= 0) {
1198                                 pr_debug("Sent LACPDU on port %d\n", port->actor_port_number);
1199                                 // mark ntt as false, so it will not be sent again until demanded
1200                                 port->ntt = 0;
1201                         }
1202                 }
1203                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1204                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1205         }
1206 }
1207
1208 /**
1209  * ad_periodic_machine - handle a port's periodic state machine
1210  * @port: the port we're looking at
1211  *
1212  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1213  */
1214 static void ad_periodic_machine(struct port *port)
1215 {
1216         periodic_states_t last_state;
1217
1218         // keep current state machine state to compare later if it was changed
1219         last_state = port->sm_periodic_state;
1220
1221         // check if port was reinitialized
1222         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1223             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1224            ) {
1225                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1226         }
1227         // check if state machine should change state
1228         else if (port->sm_periodic_timer_counter) {
1229                 // check if periodic state machine expired
1230                 if (!(--port->sm_periodic_timer_counter)) {
1231                         // if expired then do tx
1232                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1233                 } else {
1234                         // If not expired, check if there is some new timeout parameter from the partner state
1235                         switch (port->sm_periodic_state) {
1236                         case AD_FAST_PERIODIC:
1237                                 if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1238                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1239                                 }
1240                                 break;
1241                         case AD_SLOW_PERIODIC:
1242                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1243                                         // stop current timer
1244                                         port->sm_periodic_timer_counter = 0;
1245                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1246                                 }
1247                                 break;
1248                         default:    //to silence the compiler
1249                                 break;
1250                         }
1251                 }
1252         } else {
1253                 switch (port->sm_periodic_state) {
1254                 case AD_NO_PERIODIC:
1255                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1256                         break;
1257                 case AD_PERIODIC_TX:
1258                         if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1259                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1260                         } else {
1261                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1262                         }
1263                         break;
1264                 default:    //to silence the compiler
1265                         break;
1266                 }
1267         }
1268
1269         // check if the state machine was changed
1270         if (port->sm_periodic_state != last_state) {
1271                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1272                 switch (port->sm_periodic_state) {
1273                 case AD_NO_PERIODIC:
1274                         port->sm_periodic_timer_counter = 0;       // zero timer
1275                         break;
1276                 case AD_FAST_PERIODIC:
1277                         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
1278                         break;
1279                 case AD_SLOW_PERIODIC:
1280                         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
1281                         break;
1282                 case AD_PERIODIC_TX:
1283                         port->ntt = 1;
1284                         break;
1285                 default:    //to silence the compiler
1286                         break;
1287                 }
1288         }
1289 }
1290
1291 /**
1292  * ad_port_selection_logic - select aggregation groups
1293  * @port: the port we're looking at
1294  *
1295  * Select aggregation groups, and assign each port for it's aggregetor. The
1296  * selection logic is called in the inititalization (after all the handshkes),
1297  * and after every lacpdu receive (if selected is off).
1298  */
1299 static void ad_port_selection_logic(struct port *port)
1300 {
1301         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1302         struct port *last_port = NULL, *curr_port;
1303         int found = 0;
1304
1305         // if the port is already Selected, do nothing
1306         if (port->sm_vars & AD_PORT_SELECTED) {
1307                 return;
1308         }
1309
1310         // if the port is connected to other aggregator, detach it
1311         if (port->aggregator) {
1312                 // detach the port from its former aggregator
1313                 temp_aggregator=port->aggregator;
1314                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1315                         if (curr_port == port) {
1316                                 temp_aggregator->num_of_ports--;
1317                                 if (!last_port) {// if it is the first port attached to the aggregator
1318                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1319                                 } else {// not the first port attached to the aggregator
1320                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1321                                 }
1322
1323                                 // clear the port's relations to this aggregator
1324                                 port->aggregator = NULL;
1325                                 port->next_port_in_aggregator=NULL;
1326                                 port->actor_port_aggregator_identifier=0;
1327
1328                                 pr_debug("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1329                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1330                                 if (!temp_aggregator->lag_ports) {
1331                                         ad_clear_agg(temp_aggregator);
1332                                 }
1333                                 break;
1334                         }
1335                 }
1336                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1337                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Port %d (on %s) was "
1338                                "related to aggregator %d but was not on its port list\n",
1339                                port->slave->dev->master->name,
1340                                port->actor_port_number, port->slave->dev->name,
1341                                port->aggregator->aggregator_identifier);
1342                 }
1343         }
1344         // search on all aggregators for a suitable aggregator for this port
1345         for (aggregator = __get_first_agg(port); aggregator;
1346              aggregator = __get_next_agg(aggregator)) {
1347
1348                 // keep a free aggregator for later use(if needed)
1349                 if (!aggregator->lag_ports) {
1350                         if (!free_aggregator) {
1351                                 free_aggregator=aggregator;
1352                         }
1353                         continue;
1354                 }
1355                 // check if current aggregator suits us
1356                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1357                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1358                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1359                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1360                     ) &&
1361                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1362                       !aggregator->is_individual)  // but is not individual OR
1363                     )
1364                    ) {
1365                         // attach to the founded aggregator
1366                         port->aggregator = aggregator;
1367                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1368                         port->next_port_in_aggregator=aggregator->lag_ports;
1369                         port->aggregator->num_of_ports++;
1370                         aggregator->lag_ports=port;
1371                         pr_debug("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1372
1373                         // mark this port as selected
1374                         port->sm_vars |= AD_PORT_SELECTED;
1375                         found = 1;
1376                         break;
1377                 }
1378         }
1379
1380         // the port couldn't find an aggregator - attach it to a new aggregator
1381         if (!found) {
1382                 if (free_aggregator) {
1383                         // assign port a new aggregator
1384                         port->aggregator = free_aggregator;
1385                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1386
1387                         // update the new aggregator's parameters
1388                         // if port was responsed from the end-user
1389                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1390                                 port->aggregator->is_individual = 0;
1391                         } else {
1392                                 port->aggregator->is_individual = 1;
1393                         }
1394
1395                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1396                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1397                         port->aggregator->partner_system=port->partner_oper.system;
1398                         port->aggregator->partner_system_priority = port->partner_oper.system_priority;
1399                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1400                         port->aggregator->receive_state = 1;
1401                         port->aggregator->transmit_state = 1;
1402                         port->aggregator->lag_ports = port;
1403                         port->aggregator->num_of_ports++;
1404
1405                         // mark this port as selected
1406                         port->sm_vars |= AD_PORT_SELECTED;
1407
1408                         pr_debug("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1409                 } else {
1410                         printk(KERN_ERR DRV_NAME ": %s: Port %d (on %s) did not find a suitable aggregator\n",
1411                                port->slave->dev->master->name,
1412                                port->actor_port_number, port->slave->dev->name);
1413                 }
1414         }
1415         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1416         // else set ready=FALSE in all aggregator's ports
1417         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1418
1419         aggregator = __get_first_agg(port);
1420         ad_agg_selection_logic(aggregator);
1421 }
1422
1423 /*
1424  * Decide if "agg" is a better choice for the new active aggregator that
1425  * the current best, according to the ad_select policy.
1426  */
1427 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1428                                                 struct aggregator *curr)
1429 {
1430         /*
1431          * 0. If no best, select current.
1432          *
1433          * 1. If the current agg is not individual, and the best is
1434          *    individual, select current.
1435          *
1436          * 2. If current agg is individual and the best is not, keep best.
1437          *
1438          * 3. Therefore, current and best are both individual or both not
1439          *    individual, so:
1440          *
1441          * 3a. If current agg partner replied, and best agg partner did not,
1442          *     select current.
1443          *
1444          * 3b. If current agg partner did not reply and best agg partner
1445          *     did reply, keep best.
1446          *
1447          * 4.  Therefore, current and best both have partner replies or
1448          *     both do not, so perform selection policy:
1449          *
1450          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1451          *     select by bandwidth.
1452          *
1453          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1454          */
1455         if (!best)
1456                 return curr;
1457
1458         if (!curr->is_individual && best->is_individual)
1459                 return curr;
1460
1461         if (curr->is_individual && !best->is_individual)
1462                 return best;
1463
1464         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1465                 return curr;
1466
1467         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1468                 return best;
1469
1470         switch (__get_agg_selection_mode(curr->lag_ports)) {
1471         case BOND_AD_COUNT:
1472                 if (curr->num_of_ports > best->num_of_ports)
1473                         return curr;
1474
1475                 if (curr->num_of_ports < best->num_of_ports)
1476                         return best;
1477
1478                 /*FALLTHROUGH*/
1479         case BOND_AD_STABLE:
1480         case BOND_AD_BANDWIDTH:
1481                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1482                         return curr;
1483
1484                 break;
1485
1486         default:
1487                 printk(KERN_WARNING DRV_NAME
1488                        ": %s: Impossible agg select mode %d\n",
1489                        curr->slave->dev->master->name,
1490                        __get_agg_selection_mode(curr->lag_ports));
1491                 break;
1492         }
1493
1494         return best;
1495 }
1496
1497 /**
1498  * ad_agg_selection_logic - select an aggregation group for a team
1499  * @aggregator: the aggregator we're looking at
1500  *
1501  * It is assumed that only one aggregator may be selected for a team.
1502  *
1503  * The logic of this function is to select the aggregator according to
1504  * the ad_select policy:
1505  *
1506  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1507  * it, and to reselect the active aggregator only if the previous
1508  * aggregator has no more ports related to it.
1509  *
1510  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1511  * bandwidth, and reselect whenever a link state change takes place or the
1512  * set of slaves in the bond changes.
1513  *
1514  * BOND_AD_COUNT: select the aggregator with largest number of ports
1515  * (slaves), and reselect whenever a link state change takes place or the
1516  * set of slaves in the bond changes.
1517  *
1518  * FIXME: this function MUST be called with the first agg in the bond, or
1519  * __get_active_agg() won't work correctly. This function should be better
1520  * called with the bond itself, and retrieve the first agg from it.
1521  */
1522 static void ad_agg_selection_logic(struct aggregator *agg)
1523 {
1524         struct aggregator *best, *active, *origin;
1525         struct port *port;
1526
1527         origin = agg;
1528
1529         active = __get_active_agg(agg);
1530         best = active;
1531
1532         do {
1533                 agg->is_active = 0;
1534
1535                 if (agg->num_of_ports)
1536                         best = ad_agg_selection_test(best, agg);
1537
1538         } while ((agg = __get_next_agg(agg)));
1539
1540         if (best &&
1541             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1542                 /*
1543                  * For the STABLE policy, don't replace the old active
1544                  * aggregator if it's still active (it has an answering
1545                  * partner) or if both the best and active don't have an
1546                  * answering partner.
1547                  */
1548                 if (active && active->lag_ports &&
1549                     active->lag_ports->is_enabled &&
1550                     (__agg_has_partner(active) ||
1551                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1552                         if (!(!active->actor_oper_aggregator_key &&
1553                               best->actor_oper_aggregator_key)) {
1554                                 best = NULL;
1555                                 active->is_active = 1;
1556                         }
1557                 }
1558         }
1559
1560         if (best && (best == active)) {
1561                 best = NULL;
1562                 active->is_active = 1;
1563         }
1564
1565         // if there is new best aggregator, activate it
1566         if (best) {
1567                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1568                        best->aggregator_identifier, best->num_of_ports,
1569                        best->actor_oper_aggregator_key,
1570                        best->partner_oper_aggregator_key,
1571                        best->is_individual, best->is_active);
1572                 pr_debug("best ports %p slave %p %s\n",
1573                        best->lag_ports, best->slave,
1574                        best->slave ? best->slave->dev->name : "NULL");
1575
1576                 for (agg = __get_first_agg(best->lag_ports); agg;
1577                      agg = __get_next_agg(agg)) {
1578
1579                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1580                                 agg->aggregator_identifier, agg->num_of_ports,
1581                                 agg->actor_oper_aggregator_key,
1582                                 agg->partner_oper_aggregator_key,
1583                                 agg->is_individual, agg->is_active);
1584                 }
1585
1586                 // check if any partner replys
1587                 if (best->is_individual) {
1588                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad"
1589                                " response from the link partner for any"
1590                                " adapters in the bond\n",
1591                                best->slave->dev->master->name);
1592                 }
1593
1594                 best->is_active = 1;
1595                 pr_debug("LAG %d chosen as the active LAG\n",
1596                         best->aggregator_identifier);
1597                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1598                         best->aggregator_identifier, best->num_of_ports,
1599                         best->actor_oper_aggregator_key,
1600                         best->partner_oper_aggregator_key,
1601                         best->is_individual, best->is_active);
1602
1603                 // disable the ports that were related to the former active_aggregator
1604                 if (active) {
1605                         for (port = active->lag_ports; port;
1606                              port = port->next_port_in_aggregator) {
1607                                 __disable_port(port);
1608                         }
1609                 }
1610         }
1611
1612         /*
1613          * if the selected aggregator is of join individuals
1614          * (partner_system is NULL), enable their ports
1615          */
1616         active = __get_active_agg(origin);
1617
1618         if (active) {
1619                 if (!__agg_has_partner(active)) {
1620                         for (port = active->lag_ports; port;
1621                              port = port->next_port_in_aggregator) {
1622                                 __enable_port(port);
1623                         }
1624                 }
1625         }
1626
1627         if (origin->slave) {
1628                 struct bonding *bond;
1629
1630                 bond = bond_get_bond_by_slave(origin->slave);
1631                 if (bond)
1632                         bond_3ad_set_carrier(bond);
1633         }
1634 }
1635
1636 /**
1637  * ad_clear_agg - clear a given aggregator's parameters
1638  * @aggregator: the aggregator we're looking at
1639  *
1640  */
1641 static void ad_clear_agg(struct aggregator *aggregator)
1642 {
1643         if (aggregator) {
1644                 aggregator->is_individual = 0;
1645                 aggregator->actor_admin_aggregator_key = 0;
1646                 aggregator->actor_oper_aggregator_key = 0;
1647                 aggregator->partner_system = null_mac_addr;
1648                 aggregator->partner_system_priority = 0;
1649                 aggregator->partner_oper_aggregator_key = 0;
1650                 aggregator->receive_state = 0;
1651                 aggregator->transmit_state = 0;
1652                 aggregator->lag_ports = NULL;
1653                 aggregator->is_active = 0;
1654                 aggregator->num_of_ports = 0;
1655                 pr_debug("LAG %d was cleared\n", aggregator->aggregator_identifier);
1656         }
1657 }
1658
1659 /**
1660  * ad_initialize_agg - initialize a given aggregator's parameters
1661  * @aggregator: the aggregator we're looking at
1662  *
1663  */
1664 static void ad_initialize_agg(struct aggregator *aggregator)
1665 {
1666         if (aggregator) {
1667                 ad_clear_agg(aggregator);
1668
1669                 aggregator->aggregator_mac_address = null_mac_addr;
1670                 aggregator->aggregator_identifier = 0;
1671                 aggregator->slave = NULL;
1672         }
1673 }
1674
1675 /**
1676  * ad_initialize_port - initialize a given port's parameters
1677  * @aggregator: the aggregator we're looking at
1678  * @lacp_fast: boolean. whether fast periodic should be used
1679  *
1680  */
1681 static void ad_initialize_port(struct port *port, int lacp_fast)
1682 {
1683         if (port) {
1684                 port->actor_port_number = 1;
1685                 port->actor_port_priority = 0xff;
1686                 port->actor_system = null_mac_addr;
1687                 port->actor_system_priority = 0xffff;
1688                 port->actor_port_aggregator_identifier = 0;
1689                 port->ntt = 0;
1690                 port->actor_admin_port_key = 1;
1691                 port->actor_oper_port_key  = 1;
1692                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1693                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1694
1695                 if (lacp_fast) {
1696                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1697                 }
1698
1699                 port->partner_admin.system = null_mac_addr;
1700                 port->partner_oper.system  = null_mac_addr;
1701                 port->partner_admin.system_priority = 0xffff;
1702                 port->partner_oper.system_priority  = 0xffff;
1703                 port->partner_admin.key = 1;
1704                 port->partner_oper.key  = 1;
1705                 port->partner_admin.port_number = 1;
1706                 port->partner_oper.port_number  = 1;
1707                 port->partner_admin.port_priority = 0xff;
1708                 port->partner_oper.port_priority  = 0xff;
1709                 port->partner_admin.port_state = 1;
1710                 port->partner_oper.port_state  = 1;
1711                 port->is_enabled = 1;
1712                 // ****** private parameters ******
1713                 port->sm_vars = 0x3;
1714                 port->sm_rx_state = 0;
1715                 port->sm_rx_timer_counter = 0;
1716                 port->sm_periodic_state = 0;
1717                 port->sm_periodic_timer_counter = 0;
1718                 port->sm_mux_state = 0;
1719                 port->sm_mux_timer_counter = 0;
1720                 port->sm_tx_state = 0;
1721                 port->sm_tx_timer_counter = 0;
1722                 port->slave = NULL;
1723                 port->aggregator = NULL;
1724                 port->next_port_in_aggregator = NULL;
1725                 port->transaction_id = 0;
1726
1727                 ad_initialize_lacpdu(&(port->lacpdu));
1728         }
1729 }
1730
1731 /**
1732  * ad_enable_collecting_distributing - enable a port's transmit/receive
1733  * @port: the port we're looking at
1734  *
1735  * Enable @port if it's in an active aggregator
1736  */
1737 static void ad_enable_collecting_distributing(struct port *port)
1738 {
1739         if (port->aggregator->is_active) {
1740                 pr_debug("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1741                 __enable_port(port);
1742         }
1743 }
1744
1745 /**
1746  * ad_disable_collecting_distributing - disable a port's transmit/receive
1747  * @port: the port we're looking at
1748  *
1749  */
1750 static void ad_disable_collecting_distributing(struct port *port)
1751 {
1752         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1753                 pr_debug("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1754                 __disable_port(port);
1755         }
1756 }
1757
1758 #if 0
1759 /**
1760  * ad_marker_info_send - send a marker information frame
1761  * @port: the port we're looking at
1762  *
1763  * This function does nothing since we decided not to implement send and handle
1764  * response for marker PDU's, in this stage, but only to respond to marker
1765  * information.
1766  */
1767 static void ad_marker_info_send(struct port *port)
1768 {
1769         struct bond_marker marker;
1770         u16 index;
1771
1772         // fill the marker PDU with the appropriate values
1773         marker.subtype = 0x02;
1774         marker.version_number = 0x01;
1775         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1776         marker.marker_length = 0x16;
1777         // convert requester_port to Big Endian
1778         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1779         marker.requester_system = port->actor_system;
1780         // convert requester_port(u32) to Big Endian
1781         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1782         marker.pad = 0;
1783         marker.tlv_type_terminator = 0x00;
1784         marker.terminator_length = 0x00;
1785         for (index=0; index<90; index++) {
1786                 marker.reserved_90[index]=0;
1787         }
1788
1789         // send the marker information
1790         if (ad_marker_send(port, &marker) >= 0) {
1791                 pr_debug("Sent Marker Information on port %d\n", port->actor_port_number);
1792         }
1793 }
1794 #endif
1795
1796 /**
1797  * ad_marker_info_received - handle receive of a Marker information frame
1798  * @marker_info: Marker info received
1799  * @port: the port we're looking at
1800  *
1801  */
1802 static void ad_marker_info_received(struct bond_marker *marker_info,
1803         struct port *port)
1804 {
1805         struct bond_marker marker;
1806
1807         // copy the received marker data to the response marker
1808         //marker = *marker_info;
1809         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1810         // change the marker subtype to marker response
1811         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1812         // send the marker response
1813
1814         if (ad_marker_send(port, &marker) >= 0) {
1815                 pr_debug("Sent Marker Response on port %d\n", port->actor_port_number);
1816         }
1817 }
1818
1819 /**
1820  * ad_marker_response_received - handle receive of a marker response frame
1821  * @marker: marker PDU received
1822  * @port: the port we're looking at
1823  *
1824  * This function does nothing since we decided not to implement send and handle
1825  * response for marker PDU's, in this stage, but only to respond to marker
1826  * information.
1827  */
1828 static void ad_marker_response_received(struct bond_marker *marker,
1829         struct port *port)
1830 {
1831         marker=NULL; // just to satisfy the compiler
1832         port=NULL;  // just to satisfy the compiler
1833         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1834 }
1835
1836 /**
1837  * ad_initialize_lacpdu - initialize a given lacpdu structure
1838  * @lacpdu: lacpdu structure to initialize
1839  *
1840  */
1841 static void ad_initialize_lacpdu(struct lacpdu *lacpdu)
1842 {
1843         u16 index;
1844
1845         // initialize lacpdu data
1846         lacpdu->subtype = 0x01;
1847         lacpdu->version_number = 0x01;
1848         lacpdu->tlv_type_actor_info = 0x01;
1849         lacpdu->actor_information_length = 0x14;
1850         // lacpdu->actor_system_priority    updated on send
1851         // lacpdu->actor_system             updated on send
1852         // lacpdu->actor_key                updated on send
1853         // lacpdu->actor_port_priority      updated on send
1854         // lacpdu->actor_port               updated on send
1855         // lacpdu->actor_state              updated on send
1856         lacpdu->tlv_type_partner_info = 0x02;
1857         lacpdu->partner_information_length = 0x14;
1858         for (index=0; index<=2; index++) {
1859                 lacpdu->reserved_3_1[index]=0;
1860         }
1861         // lacpdu->partner_system_priority  updated on send
1862         // lacpdu->partner_system           updated on send
1863         // lacpdu->partner_key              updated on send
1864         // lacpdu->partner_port_priority    updated on send
1865         // lacpdu->partner_port             updated on send
1866         // lacpdu->partner_state            updated on send
1867         for (index=0; index<=2; index++) {
1868                 lacpdu->reserved_3_2[index]=0;
1869         }
1870         lacpdu->tlv_type_collector_info = 0x03;
1871         lacpdu->collector_information_length= 0x10;
1872         lacpdu->collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY);
1873         for (index=0; index<=11; index++) {
1874                 lacpdu->reserved_12[index]=0;
1875         }
1876         lacpdu->tlv_type_terminator = 0x00;
1877         lacpdu->terminator_length = 0;
1878         for (index=0; index<=49; index++) {
1879                 lacpdu->reserved_50[index]=0;
1880         }
1881 }
1882
1883 //////////////////////////////////////////////////////////////////////////////////////
1884 // ================= AD exported functions to the main bonding code ==================
1885 //////////////////////////////////////////////////////////////////////////////////////
1886
1887 // Check aggregators status in team every T seconds
1888 #define AD_AGGREGATOR_SELECTION_TIMER  8
1889
1890 /*
1891  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1892  *
1893  * Set the aggregation selection timer, to initiate an agg selection in
1894  * the very near future.  Called during first initialization, and during
1895  * any down to up transitions of the bond.
1896  */
1897 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1898 {
1899         BOND_AD_INFO(bond).agg_select_timer = timeout;
1900         BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
1901 }
1902
1903 static u16 aggregator_identifier;
1904
1905 /**
1906  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1907  * @bond: bonding struct to work on
1908  * @tick_resolution: tick duration (millisecond resolution)
1909  * @lacp_fast: boolean. whether fast periodic should be used
1910  *
1911  * Can be called only after the mac address of the bond is set.
1912  */
1913 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1914 {
1915         // check that the bond is not initialized yet
1916         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr), &(bond->dev->dev_addr))) {
1917
1918                 aggregator_identifier = 0;
1919
1920                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1921                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1922                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1923
1924                 // initialize how many times this module is called in one second(should be about every 100ms)
1925                 ad_ticks_per_sec = tick_resolution;
1926
1927                 bond_3ad_initiate_agg_selection(bond,
1928                                                 AD_AGGREGATOR_SELECTION_TIMER *
1929                                                 ad_ticks_per_sec);
1930         }
1931 }
1932
1933 /**
1934  * bond_3ad_bind_slave - initialize a slave's port
1935  * @slave: slave struct to work on
1936  *
1937  * Returns:   0 on success
1938  *          < 0 on error
1939  */
1940 int bond_3ad_bind_slave(struct slave *slave)
1941 {
1942         struct bonding *bond = bond_get_bond_by_slave(slave);
1943         struct port *port;
1944         struct aggregator *aggregator;
1945
1946         if (bond == NULL) {
1947                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1948                        slave->dev->master->name, slave->dev->name);
1949                 return -1;
1950         }
1951
1952         //check that the slave has not been intialized yet.
1953         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1954
1955                 // port initialization
1956                 port = &(SLAVE_AD_INFO(slave).port);
1957
1958                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1959
1960                 port->slave = slave;
1961                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1962                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1963                 //              ------------------------------------------------------------
1964                 // Port key :   | User key                       |      Speed       |Duplex|
1965                 //              ------------------------------------------------------------
1966                 //              16                               6               1 0
1967                 port->actor_admin_port_key = 0; // initialize this parameter
1968                 port->actor_admin_port_key |= __get_duplex(port);
1969                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1970                 port->actor_oper_port_key = port->actor_admin_port_key;
1971                 // if the port is not full duplex, then the port should be not lacp Enabled
1972                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1973                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1974                 }
1975                 // actor system is the bond's system
1976                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1977                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1978                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1979                 port->aggregator = NULL;
1980                 port->next_port_in_aggregator = NULL;
1981
1982                 __disable_port(port);
1983                 __initialize_port_locks(port);
1984
1985
1986                 // aggregator initialization
1987                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1988
1989                 ad_initialize_agg(aggregator);
1990
1991                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1992                 aggregator->aggregator_identifier = (++aggregator_identifier);
1993                 aggregator->slave = slave;
1994                 aggregator->is_active = 0;
1995                 aggregator->num_of_ports = 0;
1996         }
1997
1998         return 0;
1999 }
2000
2001 /**
2002  * bond_3ad_unbind_slave - deinitialize a slave's port
2003  * @slave: slave struct to work on
2004  *
2005  * Search for the aggregator that is related to this port, remove the
2006  * aggregator and assign another aggregator for other port related to it
2007  * (if any), and remove the port.
2008  */
2009 void bond_3ad_unbind_slave(struct slave *slave)
2010 {
2011         struct port *port, *prev_port, *temp_port;
2012         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2013         int select_new_active_agg = 0;
2014
2015         // find the aggregator related to this slave
2016         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
2017
2018         // find the port related to this slave
2019         port = &(SLAVE_AD_INFO(slave).port);
2020
2021         // if slave is null, the whole port is not initialized
2022         if (!port->slave) {
2023                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
2024                        "unbind an uninitialized port on %s\n",
2025                        slave->dev->master->name, slave->dev->name);
2026                 return;
2027         }
2028
2029         pr_debug("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
2030
2031         /* Tell the partner that this port is not suitable for aggregation */
2032         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2033         __update_lacpdu_from_port(port);
2034         ad_lacpdu_send(port);
2035
2036         // check if this aggregator is occupied
2037         if (aggregator->lag_ports) {
2038                 // check if there are other ports related to this aggregator except
2039                 // the port related to this slave(thats ensure us that there is a
2040                 // reason to search for new aggregator, and that we will find one
2041                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
2042                         // find new aggregator for the related port(s)
2043                         new_aggregator = __get_first_agg(port);
2044                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
2045                                 // if the new aggregator is empty, or it connected to to our port only
2046                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
2047                                         break;
2048                                 }
2049                         }
2050                         // if new aggregator found, copy the aggregator's parameters
2051                         // and connect the related lag_ports to the new aggregator
2052                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2053                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
2054
2055                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
2056                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2057                                                aggregator->slave->dev->master->name);
2058                                         // select new active aggregator
2059                                          select_new_active_agg = 1;
2060                                 }
2061
2062                                 new_aggregator->is_individual = aggregator->is_individual;
2063                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2064                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2065                                 new_aggregator->partner_system = aggregator->partner_system;
2066                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2067                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2068                                 new_aggregator->receive_state = aggregator->receive_state;
2069                                 new_aggregator->transmit_state = aggregator->transmit_state;
2070                                 new_aggregator->lag_ports = aggregator->lag_ports;
2071                                 new_aggregator->is_active = aggregator->is_active;
2072                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2073
2074                                 // update the information that is written on the ports about the aggregator
2075                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2076                                         temp_port->aggregator=new_aggregator;
2077                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2078                                 }
2079
2080                                 // clear the aggregator
2081                                 ad_clear_agg(aggregator);
2082
2083                                 if (select_new_active_agg) {
2084                                         ad_agg_selection_logic(__get_first_agg(port));
2085                                 }
2086                         } else {
2087                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2088                                        "and could not find a new aggregator for its ports\n",
2089                                        slave->dev->master->name);
2090                         }
2091                 } else { // in case that the only port related to this aggregator is the one we want to remove
2092                         select_new_active_agg = aggregator->is_active;
2093                         // clear the aggregator
2094                         ad_clear_agg(aggregator);
2095                         if (select_new_active_agg) {
2096                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2097                                        slave->dev->master->name);
2098                                 // select new active aggregator
2099                                 ad_agg_selection_logic(__get_first_agg(port));
2100                         }
2101                 }
2102         }
2103
2104         pr_debug("Unbinding port %d\n", port->actor_port_number);
2105         // find the aggregator that this port is connected to
2106         temp_aggregator = __get_first_agg(port);
2107         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2108                 prev_port = NULL;
2109                 // search the port in the aggregator's related ports
2110                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2111                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2112                                 if (prev_port) {
2113                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2114                                 } else {
2115                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2116                                 }
2117                                 temp_aggregator->num_of_ports--;
2118                                 if (temp_aggregator->num_of_ports==0) {
2119                                         select_new_active_agg = temp_aggregator->is_active;
2120                                         // clear the aggregator
2121                                         ad_clear_agg(temp_aggregator);
2122                                         if (select_new_active_agg) {
2123                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2124                                                        slave->dev->master->name);
2125                                                 // select new active aggregator
2126                                                 ad_agg_selection_logic(__get_first_agg(port));
2127                                         }
2128                                 }
2129                                 break;
2130                         }
2131                 }
2132         }
2133         port->slave=NULL;
2134 }
2135
2136 /**
2137  * bond_3ad_state_machine_handler - handle state machines timeout
2138  * @bond: bonding struct to work on
2139  *
2140  * The state machine handling concept in this module is to check every tick
2141  * which state machine should operate any function. The execution order is
2142  * round robin, so when we have an interaction between state machines, the
2143  * reply of one to each other might be delayed until next tick.
2144  *
2145  * This function also complete the initialization when the agg_select_timer
2146  * times out, and it selects an aggregator for the ports that are yet not
2147  * related to any aggregator, and selects the active aggregator for a bond.
2148  */
2149 void bond_3ad_state_machine_handler(struct work_struct *work)
2150 {
2151         struct bonding *bond = container_of(work, struct bonding,
2152                                             ad_work.work);
2153         struct port *port;
2154         struct aggregator *aggregator;
2155
2156         read_lock(&bond->lock);
2157
2158         if (bond->kill_timers) {
2159                 goto out;
2160         }
2161
2162         //check if there are any slaves
2163         if (bond->slave_cnt == 0) {
2164                 goto re_arm;
2165         }
2166
2167         // check if agg_select_timer timer after initialize is timed out
2168         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2169                 // select the active aggregator for the bond
2170                 if ((port = __get_first_port(bond))) {
2171                         if (!port->slave) {
2172                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2173                                        "uninitialized\n", bond->dev->name);
2174                                 goto re_arm;
2175                         }
2176
2177                         aggregator = __get_first_agg(port);
2178                         ad_agg_selection_logic(aggregator);
2179                 }
2180                 bond_3ad_set_carrier(bond);
2181         }
2182
2183         // for each port run the state machines
2184         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2185                 if (!port->slave) {
2186                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2187                                "port\n", bond->dev->name);
2188                         goto re_arm;
2189                 }
2190
2191                 ad_rx_machine(NULL, port);
2192                 ad_periodic_machine(port);
2193                 ad_port_selection_logic(port);
2194                 ad_mux_machine(port);
2195                 ad_tx_machine(port);
2196
2197                 // turn off the BEGIN bit, since we already handled it
2198                 if (port->sm_vars & AD_PORT_BEGIN) {
2199                         port->sm_vars &= ~AD_PORT_BEGIN;
2200                 }
2201         }
2202
2203 re_arm:
2204         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2205 out:
2206         read_unlock(&bond->lock);
2207 }
2208
2209 /**
2210  * bond_3ad_rx_indication - handle a received frame
2211  * @lacpdu: received lacpdu
2212  * @slave: slave struct to work on
2213  * @length: length of the data received
2214  *
2215  * It is assumed that frames that were sent on this NIC don't returned as new
2216  * received frames (loopback). Since only the payload is given to this
2217  * function, it check for loopback.
2218  */
2219 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2220 {
2221         struct port *port;
2222
2223         if (length >= sizeof(struct lacpdu)) {
2224
2225                 port = &(SLAVE_AD_INFO(slave).port);
2226
2227                 if (!port->slave) {
2228                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2229                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2230                         return;
2231                 }
2232
2233                 switch (lacpdu->subtype) {
2234                 case AD_TYPE_LACPDU:
2235                         pr_debug("Received LACPDU on port %d\n", port->actor_port_number);
2236                         ad_rx_machine(lacpdu, port);
2237                         break;
2238
2239                 case AD_TYPE_MARKER:
2240                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2241
2242                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2243                         case AD_MARKER_INFORMATION_SUBTYPE:
2244                                 pr_debug("Received Marker Information on port %d\n", port->actor_port_number);
2245                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2246                                 break;
2247
2248                         case AD_MARKER_RESPONSE_SUBTYPE:
2249                                 pr_debug("Received Marker Response on port %d\n", port->actor_port_number);
2250                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2251                                 break;
2252
2253                         default:
2254                                 pr_debug("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2255                         }
2256                 }
2257         }
2258 }
2259
2260 /**
2261  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2262  * @slave: slave struct to work on
2263  *
2264  * Handle reselection of aggregator (if needed) for this port.
2265  */
2266 void bond_3ad_adapter_speed_changed(struct slave *slave)
2267 {
2268         struct port *port;
2269
2270         port = &(SLAVE_AD_INFO(slave).port);
2271
2272         // if slave is null, the whole port is not initialized
2273         if (!port->slave) {
2274                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2275                        "changed for uninitialized port on %s\n",
2276                        slave->dev->master->name, slave->dev->name);
2277                 return;
2278         }
2279
2280         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2281         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2282         pr_debug("Port %d changed speed\n", port->actor_port_number);
2283         // there is no need to reselect a new aggregator, just signal the
2284         // state machines to reinitialize
2285         port->sm_vars |= AD_PORT_BEGIN;
2286 }
2287
2288 /**
2289  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2290  * @slave: slave struct to work on
2291  *
2292  * Handle reselection of aggregator (if needed) for this port.
2293  */
2294 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2295 {
2296         struct port *port;
2297
2298         port=&(SLAVE_AD_INFO(slave).port);
2299
2300         // if slave is null, the whole port is not initialized
2301         if (!port->slave) {
2302                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2303                        "for uninitialized port on %s\n",
2304                        slave->dev->master->name, slave->dev->name);
2305                 return;
2306         }
2307
2308         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2309         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2310         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2311         // there is no need to reselect a new aggregator, just signal the
2312         // state machines to reinitialize
2313         port->sm_vars |= AD_PORT_BEGIN;
2314 }
2315
2316 /**
2317  * bond_3ad_handle_link_change - handle a slave's link status change indication
2318  * @slave: slave struct to work on
2319  * @status: whether the link is now up or down
2320  *
2321  * Handle reselection of aggregator (if needed) for this port.
2322  */
2323 void bond_3ad_handle_link_change(struct slave *slave, char link)
2324 {
2325         struct port *port;
2326
2327         port = &(SLAVE_AD_INFO(slave).port);
2328
2329         // if slave is null, the whole port is not initialized
2330         if (!port->slave) {
2331                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2332                        "uninitialized port on %s\n",
2333                         slave->dev->master->name, slave->dev->name);
2334                 return;
2335         }
2336
2337         // 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)
2338         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2339         if (link == BOND_LINK_UP) {
2340                 port->is_enabled = 1;
2341                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2342                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2343                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2344                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2345         } else {
2346                 /* link has failed */
2347                 port->is_enabled = 0;
2348                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2349                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2350         }
2351         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2352         // there is no need to reselect a new aggregator, just signal the
2353         // state machines to reinitialize
2354         port->sm_vars |= AD_PORT_BEGIN;
2355 }
2356
2357 /*
2358  * set link state for bonding master: if we have an active
2359  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2360  * have an active aggregator if there are no slaves with link up.
2361  *
2362  * This behavior complies with IEEE 802.3 section 43.3.9.
2363  *
2364  * Called by bond_set_carrier(). Return zero if carrier state does not
2365  * change, nonzero if it does.
2366  */
2367 int bond_3ad_set_carrier(struct bonding *bond)
2368 {
2369         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2370                 if (!netif_carrier_ok(bond->dev)) {
2371                         netif_carrier_on(bond->dev);
2372                         return 1;
2373                 }
2374                 return 0;
2375         }
2376
2377         if (netif_carrier_ok(bond->dev)) {
2378                 netif_carrier_off(bond->dev);
2379                 return 1;
2380         }
2381         return 0;
2382 }
2383
2384 /**
2385  * bond_3ad_get_active_agg_info - get information of the active aggregator
2386  * @bond: bonding struct to work on
2387  * @ad_info: ad_info struct to fill with the bond's info
2388  *
2389  * Returns:   0 on success
2390  *          < 0 on error
2391  */
2392 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2393 {
2394         struct aggregator *aggregator = NULL;
2395         struct port *port;
2396
2397         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2398                 if (port->aggregator && port->aggregator->is_active) {
2399                         aggregator = port->aggregator;
2400                         break;
2401                 }
2402         }
2403
2404         if (aggregator) {
2405                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2406                 ad_info->ports = aggregator->num_of_ports;
2407                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2408                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2409                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2410                 return 0;
2411         }
2412
2413         return -1;
2414 }
2415
2416 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2417 {
2418         struct slave *slave, *start_at;
2419         struct bonding *bond = netdev_priv(dev);
2420         int slave_agg_no;
2421         int slaves_in_agg;
2422         int agg_id;
2423         int i;
2424         struct ad_info ad_info;
2425         int res = 1;
2426
2427         /* make sure that the slaves list will
2428          * not change during tx
2429          */
2430         read_lock(&bond->lock);
2431
2432         if (!BOND_IS_OK(bond)) {
2433                 goto out;
2434         }
2435
2436         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2437                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2438                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2439                 goto out;
2440         }
2441
2442         slaves_in_agg = ad_info.ports;
2443         agg_id = ad_info.aggregator_id;
2444
2445         if (slaves_in_agg == 0) {
2446                 /*the aggregator is empty*/
2447                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2448                        "aggregator is empty\n",
2449                        dev->name);
2450                 goto out;
2451         }
2452
2453         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2454
2455         bond_for_each_slave(bond, slave, i) {
2456                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2457
2458                 if (agg && (agg->aggregator_identifier == agg_id)) {
2459                         slave_agg_no--;
2460                         if (slave_agg_no < 0) {
2461                                 break;
2462                         }
2463                 }
2464         }
2465
2466         if (slave_agg_no >= 0) {
2467                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2468                        "for aggregator ID %d\n", dev->name, agg_id);
2469                 goto out;
2470         }
2471
2472         start_at = slave;
2473
2474         bond_for_each_slave_from(bond, slave, i, start_at) {
2475                 int slave_agg_id = 0;
2476                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2477
2478                 if (agg) {
2479                         slave_agg_id = agg->aggregator_identifier;
2480                 }
2481
2482                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2483                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2484                         break;
2485                 }
2486         }
2487
2488 out:
2489         if (res) {
2490                 /* no suitable interface, frame not sent */
2491                 dev_kfree_skb(skb);
2492         }
2493         read_unlock(&bond->lock);
2494         return 0;
2495 }
2496
2497 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2498 {
2499         struct bonding *bond = netdev_priv(dev);
2500         struct slave *slave = NULL;
2501         int ret = NET_RX_DROP;
2502
2503         if (dev_net(dev) != &init_net)
2504                 goto out;
2505
2506         if (!(dev->flags & IFF_MASTER))
2507                 goto out;
2508
2509         read_lock(&bond->lock);
2510         slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev),
2511                                         orig_dev);
2512         if (!slave)
2513                 goto out_unlock;
2514
2515         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2516
2517         ret = NET_RX_SUCCESS;
2518
2519 out_unlock:
2520         read_unlock(&bond->lock);
2521 out:
2522         dev_kfree_skb(skb);
2523
2524         return ret;
2525 }
2526