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 //#define BONDING_DEBUG 1
  24
  25 #include <linux/skbuff.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/if_bonding.h>
  31 #include <linux/pkt_sched.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 //endalloun
  89
  90 // compare MAC addresses
  91 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  92
  93 static struct mac_addr null_mac_addr = {{0, 0, 0, 0, 0, 0}};
  94 static u16 ad_ticks_per_sec;
  95 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  96
  97 // ================= 3AD api to bonding and kernel code ==================
  98 static u16 __get_link_speed(struct port *port);
  99 static u8 __get_duplex(struct port *port);
 100 static inline void __initialize_port_locks(struct port *port);
 101 //conversions
 102 static void __ntohs_lacpdu(struct lacpdu *lacpdu);
 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 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 marker *marker_info, struct port *port);
 142 static void ad_marker_response_received(struct 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  * __disable_port - disable the port's slave
 240  * @port: the port we're looking at
 241  *
 242  */
 243 static inline void __disable_port(struct port *port)
 244 {
 245         bond_set_slave_inactive_flags(port->slave);
 246 }
 247
 248 /**
 249  * __enable_port - enable the port's slave, if it's up
 250  * @port: the port we're looking at
 251  *
 252  */
 253 static inline void __enable_port(struct port *port)
 254 {
 255         struct slave *slave = port->slave;
 256
 257         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev)) {
 258                 bond_set_slave_active_flags(slave);
 259         }
 260 }
 261
 262 /**
 263  * __port_is_enabled - check if the port's slave is in active state
 264  * @port: the port we're looking at
 265  *
 266  */
 267 static inline int __port_is_enabled(struct port *port)
 268 {
 269         return(port->slave->state == BOND_STATE_ACTIVE);
 270 }
 271
 272 /**
 273  * __get_agg_selection_mode - get the aggregator selection mode
 274  * @port: the port we're looking at
 275  *
 276  * Get the aggregator selection mode. Can be %BANDWIDTH or %COUNT.
 277  */
 278 static inline u32 __get_agg_selection_mode(struct port *port)
 279 {
 280         struct bonding *bond = __get_bond_by_port(port);
 281
 282         if (bond == NULL) {
 283                 return AD_BANDWIDTH;
 284         }
 285
 286         return BOND_AD_INFO(bond).agg_select_mode;
 287 }
 288
 289 /**
 290  * __check_agg_selection_timer - check if the selection timer has expired
 291  * @port: the port we're looking at
 292  *
 293  */
 294 static inline int __check_agg_selection_timer(struct port *port)
 295 {
 296         struct bonding *bond = __get_bond_by_port(port);
 297
 298         if (bond == NULL) {
 299                 return 0;
 300         }
 301
 302         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 303 }
 304
 305 /**
 306  * __get_rx_machine_lock - lock the port's RX machine
 307  * @port: the port we're looking at
 308  *
 309  */
 310 static inline void __get_rx_machine_lock(struct port *port)
 311 {
 312         spin_lock(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 313 }
 314
 315 /**
 316  * __release_rx_machine_lock - unlock the port's RX machine
 317  * @port: the port we're looking at
 318  *
 319  */
 320 static inline void __release_rx_machine_lock(struct port *port)
 321 {
 322         spin_unlock(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 323 }
 324
 325 /**
 326  * __get_link_speed - get a port's speed
 327  * @port: the port we're looking at
 328  *
 329  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 330  *     0,
 331  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 332  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 333  *     %AD_LINK_SPEED_BITMASK_1000MBPS
 334  */
 335 static u16 __get_link_speed(struct port *port)
 336 {
 337         struct slave *slave = port->slave;
 338         u16 speed;
 339
 340         /* this if covers only a special case: when the configuration starts with
 341          * link down, it sets the speed to 0.
 342          * This is done in spite of the fact that the e100 driver reports 0 to be
 343          * compatible with MVT in the future.*/
 344         if (slave->link != BOND_LINK_UP) {
 345                 speed=0;
 346         } else {
 347                 switch (slave->speed) {
 348                 case SPEED_10:
 349                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 350                         break;
 351
 352                 case SPEED_100:
 353                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 354                         break;
 355
 356                 case SPEED_1000:
 357                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 358                         break;
 359
 360                 default:
 361                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 362                         break;
 363                 }
 364         }
 365
 366         dprintk("Port %d Received link speed %d update from adapter\n", port->actor_port_number, speed);
 367         return speed;
 368 }
 369
 370 /**
 371  * __get_duplex - get a port's duplex
 372  * @port: the port we're looking at
 373  *
 374  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 375  *     0x01 if in full duplex
 376  *     0x00 otherwise
 377  */
 378 static u8 __get_duplex(struct port *port)
 379 {
 380         struct slave *slave = port->slave;
 381
 382         u8 retval;
 383
 384         //  handling a special case: when the configuration starts with
 385         // link down, it sets the duplex to 0.
 386         if (slave->link != BOND_LINK_UP) {
 387                 retval=0x0;
 388         } else {
 389                 switch (slave->duplex) {
 390                 case DUPLEX_FULL:
 391                         retval=0x1;
 392                         dprintk("Port %d Received status full duplex update from adapter\n", port->actor_port_number);
 393                         break;
 394                 case DUPLEX_HALF:
 395                 default:
 396                         retval=0x0;
 397                         dprintk("Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number);
 398                         break;
 399                 }
 400         }
 401         return retval;
 402 }
 403
 404 /**
 405  * __initialize_port_locks - initialize a port's RX machine spinlock
 406  * @port: the port we're looking at
 407  *
 408  */
 409 static inline void __initialize_port_locks(struct port *port)
 410 {
 411         // make sure it isn't called twice
 412         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 413 }
 414
 415 //conversions
 416 /**
 417  * __ntohs_lacpdu - convert the contents of a LACPDU to host byte order
 418  * @lacpdu: the speicifed lacpdu
 419  *
 420  * For each multi-byte field in the lacpdu, convert its content
 421  */
 422 static void __ntohs_lacpdu(struct lacpdu *lacpdu)
 423 {
 424         if (lacpdu) {
 425                 lacpdu->actor_system_priority =   ntohs(lacpdu->actor_system_priority);
 426                 lacpdu->actor_key =               ntohs(lacpdu->actor_key);
 427                 lacpdu->actor_port_priority =     ntohs(lacpdu->actor_port_priority);
 428                 lacpdu->actor_port =              ntohs(lacpdu->actor_port);
 429                 lacpdu->partner_system_priority = ntohs(lacpdu->partner_system_priority);
 430                 lacpdu->partner_key =             ntohs(lacpdu->partner_key);
 431                 lacpdu->partner_port_priority =   ntohs(lacpdu->partner_port_priority);
 432                 lacpdu->partner_port =            ntohs(lacpdu->partner_port);
 433                 lacpdu->collector_max_delay =     ntohs(lacpdu->collector_max_delay);
 434         }
 435 }
 436
 437 /**
 438  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 439  * @timer_type: which timer to operate
 440  * @par: timer parameter. see below
 441  *
 442  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 443  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 444  *                                                  %SLOW_PERIODIC_TIME.
 445  */
 446 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 447 {
 448         u16 retval=0;    //to silence the compiler
 449
 450         switch (timer_type) {
 451         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 452                 if (par) {            // for short or long timeout
 453                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 454                 } else {
 455                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 456                 }
 457                 break;
 458         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 459                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 460                 break;
 461         case AD_PERIODIC_TIMER:     // for periodic machine
 462                 retval = (par*ad_ticks_per_sec); // long timeout
 463                 break;
 464         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 465                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 466                 break;
 467         case AD_WAIT_WHILE_TIMER:           // for selection machine
 468                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 469                 break;
 470         }
 471         return retval;
 472 }
 473
 474
 475 /////////////////////////////////////////////////////////////////////////////////
 476 // ================= ad_rx_machine helper functions ==================
 477 /////////////////////////////////////////////////////////////////////////////////
 478
 479 /**
 480  * __record_pdu - record parameters from a received lacpdu
 481  * @lacpdu: the lacpdu we've received
 482  * @port: the port we're looking at
 483  *
 484  * Record the parameter values for the Actor carried in a received lacpdu as
 485  * the current partner operational parameter values and sets
 486  * actor_oper_port_state.defaulted to FALSE.
 487  */
 488 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 489 {
 490         // validate lacpdu and port
 491         if (lacpdu && port) {
 492                 // record the new parameter values for the partner operational
 493                 port->partner_oper_port_number = lacpdu->actor_port;
 494                 port->partner_oper_port_priority = lacpdu->actor_port_priority;
 495                 port->partner_oper_system = lacpdu->actor_system;
 496                 port->partner_oper_system_priority = lacpdu->actor_system_priority;
 497                 port->partner_oper_key = lacpdu->actor_key;
 498                 // zero partener's lase states
 499                 port->partner_oper_port_state = 0;
 500                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_ACTIVITY);
 501                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_TIMEOUT);
 502                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_AGGREGATION);
 503                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION);
 504                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_COLLECTING);
 505                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DISTRIBUTING);
 506                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DEFAULTED);
 507                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_EXPIRED);
 508
 509                 // set actor_oper_port_state.defaulted to FALSE
 510                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 511
 512                 // set the partner sync. to on if the partner is sync. and the port is matched
 513                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 514                         port->partner_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 515                 } else {
 516                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 517                 }
 518         }
 519 }
 520
 521 /**
 522  * __record_default - record default parameters
 523  * @port: the port we're looking at
 524  *
 525  * This function records the default parameter values for the partner carried
 526  * in the Partner Admin parameters as the current partner operational parameter
 527  * values and sets actor_oper_port_state.defaulted to TRUE.
 528  */
 529 static void __record_default(struct port *port)
 530 {
 531         // validate the port
 532         if (port) {
 533                 // record the partner admin parameters
 534                 port->partner_oper_port_number = port->partner_admin_port_number;
 535                 port->partner_oper_port_priority = port->partner_admin_port_priority;
 536                 port->partner_oper_system = port->partner_admin_system;
 537                 port->partner_oper_system_priority = port->partner_admin_system_priority;
 538                 port->partner_oper_key = port->partner_admin_key;
 539                 port->partner_oper_port_state = port->partner_admin_port_state;
 540
 541                 // set actor_oper_port_state.defaulted to true
 542                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 543         }
 544 }
 545
 546 /**
 547  * __update_selected - update a port's Selected variable from a received lacpdu
 548  * @lacpdu: the lacpdu we've received
 549  * @port: the port we're looking at
 550  *
 551  * Update the value of the selected variable, using parameter values from a
 552  * newly received lacpdu. The parameter values for the Actor carried in the
 553  * received PDU are compared with the corresponding operational parameter
 554  * values for the ports partner. If one or more of the comparisons shows that
 555  * the value(s) received in the PDU differ from the current operational values,
 556  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 557  * set to out_of_sync. Otherwise, selected remains unchanged.
 558  */
 559 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 560 {
 561         // validate lacpdu and port
 562         if (lacpdu && port) {
 563                 // check if any parameter is different
 564                 if ((lacpdu->actor_port != port->partner_oper_port_number) ||
 565                     (lacpdu->actor_port_priority != port->partner_oper_port_priority) ||
 566                     MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->partner_oper_system)) ||
 567                     (lacpdu->actor_system_priority != port->partner_oper_system_priority) ||
 568                     (lacpdu->actor_key != port->partner_oper_key) ||
 569                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
 570                    ) {
 571                         // update the state machine Selected variable
 572                         port->sm_vars &= ~AD_PORT_SELECTED;
 573                 }
 574         }
 575 }
 576
 577 /**
 578  * __update_default_selected - update a port's Selected variable from Partner
 579  * @port: the port we're looking at
 580  *
 581  * This function updates the value of the selected variable, using the partner
 582  * administrative parameter values. The administrative values are compared with
 583  * the corresponding operational parameter values for the partner. If one or
 584  * more of the comparisons shows that the administrative value(s) differ from
 585  * the current operational values, then Selected is set to FALSE and
 586  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 587  * Selected remains unchanged.
 588  */
 589 static void __update_default_selected(struct port *port)
 590 {
 591         // validate the port
 592         if (port) {
 593                 // check if any parameter is different
 594                 if ((port->partner_admin_port_number != port->partner_oper_port_number) ||
 595                     (port->partner_admin_port_priority != port->partner_oper_port_priority) ||
 596                     MAC_ADDRESS_COMPARE(&(port->partner_admin_system), &(port->partner_oper_system)) ||
 597                     (port->partner_admin_system_priority != port->partner_oper_system_priority) ||
 598                     (port->partner_admin_key != port->partner_oper_key) ||
 599                     ((port->partner_admin_port_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
 600                    ) {
 601                         // update the state machine Selected variable
 602                         port->sm_vars &= ~AD_PORT_SELECTED;
 603                 }
 604         }
 605 }
 606
 607 /**
 608  * __choose_matched - update a port's matched variable from a received lacpdu
 609  * @lacpdu: the lacpdu we've received
 610  * @port: the port we're looking at
 611  *
 612  * Update the value of the matched variable, using parameter values from a
 613  * newly received lacpdu. Parameter values for the partner carried in the
 614  * received PDU are compared with the corresponding operational parameter
 615  * values for the actor. Matched is set to TRUE if all of these parameters
 616  * match and the PDU parameter partner_state.aggregation has the same value as
 617  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 618  * in the aggregation. Matched is also set to TRUE if the value of
 619  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 620  * an individual link and lacp will actively maintain the link. Otherwise,
 621  * matched is set to FALSE. LACP is considered to be actively maintaining the
 622  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 623  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 624  * partner_state.lacp_activity variables are TRUE.
 625  */
 626 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 627 {
 628         // validate lacpdu and port
 629         if (lacpdu && port) {
 630                 // check if all parameters are alike
 631                 if (((lacpdu->partner_port == port->actor_port_number) &&
 632                      (lacpdu->partner_port_priority == port->actor_port_priority) &&
 633                      !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 634                      (lacpdu->partner_system_priority == port->actor_system_priority) &&
 635                      (lacpdu->partner_key == port->actor_oper_port_key) &&
 636                      ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 637                     // or this is individual link(aggregation == FALSE)
 638                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 639                    ) {
 640                         // update the state machine Matched variable
 641                         port->sm_vars |= AD_PORT_MATCHED;
 642                 } else {
 643                         port->sm_vars &= ~AD_PORT_MATCHED;
 644                 }
 645         }
 646 }
 647
 648 /**
 649  * __update_ntt - update a port's ntt variable from a received lacpdu
 650  * @lacpdu: the lacpdu we've received
 651  * @port: the port we're looking at
 652  *
 653  * Updates the value of the ntt variable, using parameter values from a newly
 654  * received lacpdu. The parameter values for the partner carried in the
 655  * received PDU are compared with the corresponding operational parameter
 656  * values for the Actor. If one or more of the comparisons shows that the
 657  * value(s) received in the PDU differ from the current operational values,
 658  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 659  */
 660 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 661 {
 662         // validate lacpdu and port
 663         if (lacpdu && port) {
 664                 // check if any parameter is different
 665                 if ((lacpdu->partner_port != port->actor_port_number) ||
 666                     (lacpdu->partner_port_priority != port->actor_port_priority) ||
 667                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 668                     (lacpdu->partner_system_priority != port->actor_system_priority) ||
 669                     (lacpdu->partner_key != port->actor_oper_port_key) ||
 670                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 671                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 672                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 673                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 674                    ) {
 675                         // set ntt to be TRUE
 676                         port->ntt = 1;
 677                 }
 678         }
 679 }
 680
 681 /**
 682  * __attach_bond_to_agg
 683  * @port: the port we're looking at
 684  *
 685  * Handle the attaching of the port's control parser/multiplexer and the
 686  * aggregator. This function does nothing since the parser/multiplexer of the
 687  * receive and the parser/multiplexer of the aggregator are already combined.
 688  */
 689 static void __attach_bond_to_agg(struct port *port)
 690 {
 691         port=NULL; // just to satisfy the compiler
 692         // This function does nothing since the parser/multiplexer of the receive
 693         // and the parser/multiplexer of the aggregator are already combined
 694 }
 695
 696 /**
 697  * __detach_bond_from_agg
 698  * @port: the port we're looking at
 699  *
 700  * Handle the detaching of the port's control parser/multiplexer from the
 701  * aggregator. This function does nothing since the parser/multiplexer of the
 702  * receive and the parser/multiplexer of the aggregator are already combined.
 703  */
 704 static void __detach_bond_from_agg(struct port *port)
 705 {
 706         port=NULL; // just to satisfy the compiler
 707         // This function does nothing sience the parser/multiplexer of the receive
 708         // and the parser/multiplexer of the aggregator are already combined
 709 }
 710
 711 /**
 712  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 713  * @aggregator: the aggregator we're looking at
 714  *
 715  */
 716 static int __agg_ports_are_ready(struct aggregator *aggregator)
 717 {
 718         struct port *port;
 719         int retval = 1;
 720
 721         if (aggregator) {
 722                 // scan all ports in this aggregator to verfy if they are all ready
 723                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 724                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 725                                 retval = 0;
 726                                 break;
 727                         }
 728                 }
 729         }
 730
 731         return retval;
 732 }
 733
 734 /**
 735  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 736  * @aggregator: the aggregator we're looking at
 737  * @val: Should the ports' ready bit be set on or off
 738  *
 739  */
 740 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 741 {
 742         struct port *port;
 743
 744         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 745                 if (val) {
 746                         port->sm_vars |= AD_PORT_READY;
 747                 } else {
 748                         port->sm_vars &= ~AD_PORT_READY;
 749                 }
 750         }
 751 }
 752
 753 /**
 754  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 755  * @aggregator: the aggregator we're looking at
 756  *
 757  */
 758 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 759 {
 760         u32 bandwidth=0;
 761         u32 basic_speed;
 762
 763         if (aggregator->num_of_ports) {
 764                 basic_speed = __get_link_speed(aggregator->lag_ports);
 765                 switch (basic_speed) {
 766                 case AD_LINK_SPEED_BITMASK_1MBPS:
 767                         bandwidth = aggregator->num_of_ports;
 768                         break;
 769                 case AD_LINK_SPEED_BITMASK_10MBPS:
 770                         bandwidth = aggregator->num_of_ports * 10;
 771                         break;
 772                 case AD_LINK_SPEED_BITMASK_100MBPS:
 773                         bandwidth = aggregator->num_of_ports * 100;
 774                         break;
 775                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 776                         bandwidth = aggregator->num_of_ports * 1000;
 777                         break;
 778                 default:
 779                         bandwidth=0; // to silent the compilor ....
 780                 }
 781         }
 782         return bandwidth;
 783 }
 784
 785 /**
 786  * __get_active_agg - get the current active aggregator
 787  * @aggregator: the aggregator we're looking at
 788  *
 789  */
 790 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 791 {
 792         struct aggregator *retval = NULL;
 793
 794         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 795                 if (aggregator->is_active) {
 796                         retval = aggregator;
 797                         break;
 798                 }
 799         }
 800
 801         return retval;
 802 }
 803
 804 /**
 805  * __update_lacpdu_from_port - update a port's lacpdu fields
 806  * @port: the port we're looking at
 807  *
 808  */
 809 static inline void __update_lacpdu_from_port(struct port *port)
 810 {
 811         struct lacpdu *lacpdu = &port->lacpdu;
 812
 813         /* update current actual Actor parameters */
 814         /* lacpdu->subtype                   initialized
 815          * lacpdu->version_number            initialized
 816          * lacpdu->tlv_type_actor_info       initialized
 817          * lacpdu->actor_information_length  initialized
 818          */
 819
 820         lacpdu->actor_system_priority = port->actor_system_priority;
 821         lacpdu->actor_system = port->actor_system;
 822         lacpdu->actor_key = port->actor_oper_port_key;
 823         lacpdu->actor_port_priority = port->actor_port_priority;
 824         lacpdu->actor_port = port->actor_port_number;
 825         lacpdu->actor_state = port->actor_oper_port_state;
 826
 827         /* lacpdu->reserved_3_1              initialized
 828          * lacpdu->tlv_type_partner_info     initialized
 829          * lacpdu->partner_information_length initialized
 830          */
 831
 832         lacpdu->partner_system_priority = port->partner_oper_system_priority;
 833         lacpdu->partner_system = port->partner_oper_system;
 834         lacpdu->partner_key = port->partner_oper_key;
 835         lacpdu->partner_port_priority = port->partner_oper_port_priority;
 836         lacpdu->partner_port = port->partner_oper_port_number;
 837         lacpdu->partner_state = port->partner_oper_port_state;
 838
 839         /* lacpdu->reserved_3_2              initialized
 840          * lacpdu->tlv_type_collector_info   initialized
 841          * lacpdu->collector_information_length initialized
 842          * collector_max_delay                initialized
 843          * reserved_12[12]                   initialized
 844          * tlv_type_terminator               initialized
 845          * terminator_length                 initialized
 846          * reserved_50[50]                   initialized
 847          */
 848
 849         /* Convert all non u8 parameters to Big Endian for transmit */
 850         __ntohs_lacpdu(lacpdu);
 851 }
 852
 853 //////////////////////////////////////////////////////////////////////////////////////
 854 // ================= main 802.3ad protocol code ======================================
 855 //////////////////////////////////////////////////////////////////////////////////////
 856
 857 /**
 858  * ad_lacpdu_send - send out a lacpdu packet on a given port
 859  * @port: the port we're looking at
 860  *
 861  * Returns:   0 on success
 862  *          < 0 on error
 863  */
 864 static int ad_lacpdu_send(struct port *port)
 865 {
 866         struct slave *slave = port->slave;
 867         struct sk_buff *skb;
 868         struct lacpdu_header *lacpdu_header;
 869         int length = sizeof(struct lacpdu_header);
 870         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 871
 872         skb = dev_alloc_skb(length);
 873         if (!skb) {
 874                 return -ENOMEM;
 875         }
 876
 877         skb->dev = slave->dev;
 878         skb->mac.raw = skb->data;
 879         skb->nh.raw = skb->data + ETH_HLEN;
 880         skb->protocol = PKT_TYPE_LACPDU;
 881         skb->priority = TC_PRIO_CONTROL;
 882
 883         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 884
 885         lacpdu_header->ad_header.destination_address = lacpdu_multicast_address;
 886         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 887            to identify loopback lacpdus in receive. */
 888         lacpdu_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 889         lacpdu_header->ad_header.length_type = PKT_TYPE_LACPDU;
 890
 891         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 892
 893         dev_queue_xmit(skb);
 894
 895         return 0;
 896 }
 897
 898 /**
 899  * ad_marker_send - send marker information/response on a given port
 900  * @port: the port we're looking at
 901  * @marker: marker data to send
 902  *
 903  * Returns:   0 on success
 904  *          < 0 on error
 905  */
 906 static int ad_marker_send(struct port *port, struct marker *marker)
 907 {
 908         struct slave *slave = port->slave;
 909         struct sk_buff *skb;
 910         struct marker_header *marker_header;
 911         int length = sizeof(struct marker_header);
 912         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 913
 914         skb = dev_alloc_skb(length + 16);
 915         if (!skb) {
 916                 return -ENOMEM;
 917         }
 918
 919         skb_reserve(skb, 16);
 920
 921         skb->dev = slave->dev;
 922         skb->mac.raw = skb->data;
 923         skb->nh.raw = skb->data + ETH_HLEN;
 924         skb->protocol = PKT_TYPE_LACPDU;
 925
 926         marker_header = (struct marker_header *)skb_put(skb, length);
 927
 928         marker_header->ad_header.destination_address = lacpdu_multicast_address;
 929         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 930            to identify loopback MARKERs in receive. */
 931         marker_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 932         marker_header->ad_header.length_type = PKT_TYPE_LACPDU;
 933
 934         marker_header->marker = *marker; // struct copy
 935
 936         dev_queue_xmit(skb);
 937
 938         return 0;
 939 }
 940
 941 /**
 942  * ad_mux_machine - handle a port's mux state machine
 943  * @port: the port we're looking at
 944  *
 945  */
 946 static void ad_mux_machine(struct port *port)
 947 {
 948         mux_states_t last_state;
 949
 950         // keep current State Machine state to compare later if it was changed
 951         last_state = port->sm_mux_state;
 952
 953         if (port->sm_vars & AD_PORT_BEGIN) {
 954                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 955         } else {
 956                 switch (port->sm_mux_state) {
 957                 case AD_MUX_DETACHED:
 958                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
 959                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 960                         }
 961                         break;
 962                 case AD_MUX_WAITING:
 963                         // if SELECTED == FALSE return to DETACH state
 964                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 965                                 port->sm_vars &= ~AD_PORT_READY_N;
 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                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 970                                 break;
 971                         }
 972
 973                         // check if the wait_while_timer expired
 974                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
 975                                 port->sm_vars |= AD_PORT_READY_N;
 976                         }
 977
 978                         // in order to withhold the selection logic to check all ports READY_N value
 979                         // every callback cycle to update ready variable, we check READY_N and update READY here
 980                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 981
 982                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 983                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
 984                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 985                         }
 986                         break;
 987                 case AD_MUX_ATTACHED:
 988                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 989                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 990                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 991                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 992                                 port->sm_vars &= ~AD_PORT_READY_N;
 993                                 // in order to withhold the selection logic to check all ports READY_N value
 994                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 995                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 996                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 997                         }
 998                         break;
 999                 case AD_MUX_COLLECTING_DISTRIBUTING:
1000                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
1001                             !(port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION)
1002                            ) {
1003                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
1004
1005                         } else {
1006                                 // if port state hasn't changed make
1007                                 // sure that a collecting distributing
1008                                 // port in an active aggregator is enabled
1009                                 if (port->aggregator &&
1010                                     port->aggregator->is_active &&
1011                                     !__port_is_enabled(port)) {
1012
1013                                         __enable_port(port);
1014                                 }
1015                         }
1016                         break;
1017                 default:    //to silence the compiler
1018                         break;
1019                 }
1020         }
1021
1022         // check if the state machine was changed
1023         if (port->sm_mux_state != last_state) {
1024                 dprintk("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
1025                 switch (port->sm_mux_state) {
1026                 case AD_MUX_DETACHED:
1027                         __detach_bond_from_agg(port);
1028                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1029                         ad_disable_collecting_distributing(port);
1030                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1031                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1032                         port->ntt = 1;
1033                         break;
1034                 case AD_MUX_WAITING:
1035                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1036                         break;
1037                 case AD_MUX_ATTACHED:
1038                         __attach_bond_to_agg(port);
1039                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1040                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1041                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1042                         ad_disable_collecting_distributing(port);
1043                         port->ntt = 1;
1044                         break;
1045                 case AD_MUX_COLLECTING_DISTRIBUTING:
1046                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1047                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1048                         ad_enable_collecting_distributing(port);
1049                         port->ntt = 1;
1050                         break;
1051                 default:    //to silence the compiler
1052                         break;
1053                 }
1054         }
1055 }
1056
1057 /**
1058  * ad_rx_machine - handle a port's rx State Machine
1059  * @lacpdu: the lacpdu we've received
1060  * @port: the port we're looking at
1061  *
1062  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1063  * CURRENT. If timer expired set the state machine in the proper state.
1064  * In other cases, this function checks if we need to switch to other state.
1065  */
1066 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1067 {
1068         rx_states_t last_state;
1069
1070         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1071         __get_rx_machine_lock(port);
1072
1073         // keep current State Machine state to compare later if it was changed
1074         last_state = port->sm_rx_state;
1075
1076         // check if state machine should change state
1077         // first, check if port was reinitialized
1078         if (port->sm_vars & AD_PORT_BEGIN) {
1079                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1080         }
1081         // check if port is not enabled
1082         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1083                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1084         }
1085         // check if new lacpdu arrived
1086         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1087                 port->sm_rx_timer_counter = 0; // zero timer
1088                 port->sm_rx_state = AD_RX_CURRENT;
1089         } else {
1090                 // if timer is on, and if it is expired
1091                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1092                         switch (port->sm_rx_state) {
1093                         case AD_RX_EXPIRED:
1094                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1095                                 break;
1096                         case AD_RX_CURRENT:
1097                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1098                                 break;
1099                         default:    //to silence the compiler
1100                                 break;
1101                         }
1102                 } else {
1103                         // if no lacpdu arrived and no timer is on
1104                         switch (port->sm_rx_state) {
1105                         case AD_RX_PORT_DISABLED:
1106                                 if (port->sm_vars & AD_PORT_MOVED) {
1107                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1108                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1109                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1110                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1111                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1112                                 }
1113                                 break;
1114                         default:    //to silence the compiler
1115                                 break;
1116
1117                         }
1118                 }
1119         }
1120
1121         // check if the State machine was changed or new lacpdu arrived
1122         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1123                 dprintk("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_rx_state);
1124                 switch (port->sm_rx_state) {
1125                 case AD_RX_INITIALIZE:
1126                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1127                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1128                         } else {
1129                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1130                         }
1131                         port->sm_vars &= ~AD_PORT_SELECTED;
1132                         __record_default(port);
1133                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1134                         port->sm_vars &= ~AD_PORT_MOVED;
1135                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1136
1137                         /*- Fall Through -*/
1138
1139                 case AD_RX_PORT_DISABLED:
1140                         port->sm_vars &= ~AD_PORT_MATCHED;
1141                         break;
1142                 case AD_RX_LACP_DISABLED:
1143                         port->sm_vars &= ~AD_PORT_SELECTED;
1144                         __record_default(port);
1145                         port->partner_oper_port_state &= ~AD_STATE_AGGREGATION;
1146                         port->sm_vars |= AD_PORT_MATCHED;
1147                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1148                         break;
1149                 case AD_RX_EXPIRED:
1150                         //Reset of the Synchronization flag. (Standard 43.4.12)
1151                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1152                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1153                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1154                         port->sm_vars &= ~AD_PORT_MATCHED;
1155                         port->partner_oper_port_state |= AD_SHORT_TIMEOUT;
1156                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1157                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1158                         break;
1159                 case AD_RX_DEFAULTED:
1160                         __update_default_selected(port);
1161                         __record_default(port);
1162                         port->sm_vars |= AD_PORT_MATCHED;
1163                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1164                         break;
1165                 case AD_RX_CURRENT:
1166                         // detect loopback situation
1167                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1168                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1169                                 printk(KERN_ERR DRV_NAME ": %s: An illegal loopback occurred on "
1170                                        "adapter (%s). Check the configuration to verify that all "
1171                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1172                                        port->slave->dev->master->name, port->slave->dev->name);
1173                                 __release_rx_machine_lock(port);
1174                                 return;
1175                         }
1176                         __update_selected(lacpdu, port);
1177                         __update_ntt(lacpdu, port);
1178                         __record_pdu(lacpdu, port);
1179                         __choose_matched(lacpdu, port);
1180                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1181                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1182                         // verify that if the aggregator is enabled, the port is enabled too.
1183                         //(because if the link goes down for a short time, the 802.3ad will not
1184                         // catch it, and the port will continue to be disabled)
1185                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1186                                 __enable_port(port);
1187                         }
1188                         break;
1189                 default:    //to silence the compiler
1190                         break;
1191                 }
1192         }
1193         __release_rx_machine_lock(port);
1194 }
1195
1196 /**
1197  * ad_tx_machine - handle a port's tx state machine
1198  * @port: the port we're looking at
1199  *
1200  */
1201 static void ad_tx_machine(struct port *port)
1202 {
1203         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1204         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1205                 // check if there is something to send
1206                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1207                         __update_lacpdu_from_port(port);
1208                         // send the lacpdu
1209                         if (ad_lacpdu_send(port) >= 0) {
1210                                 dprintk("Sent LACPDU on port %d\n", port->actor_port_number);
1211                                 // mark ntt as false, so it will not be sent again until demanded
1212                                 port->ntt = 0;
1213                         }
1214                 }
1215                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1216                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1217         }
1218 }
1219
1220 /**
1221  * ad_periodic_machine - handle a port's periodic state machine
1222  * @port: the port we're looking at
1223  *
1224  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1225  */
1226 static void ad_periodic_machine(struct port *port)
1227 {
1228         periodic_states_t last_state;
1229
1230         // keep current state machine state to compare later if it was changed
1231         last_state = port->sm_periodic_state;
1232
1233         // check if port was reinitialized
1234         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1235             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper_port_state & AD_STATE_LACP_ACTIVITY))
1236            ) {
1237                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1238         }
1239         // check if state machine should change state
1240         else if (port->sm_periodic_timer_counter) {
1241                 // check if periodic state machine expired
1242                 if (!(--port->sm_periodic_timer_counter)) {
1243                         // if expired then do tx
1244                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1245                 } else {
1246                         // If not expired, check if there is some new timeout parameter from the partner state
1247                         switch (port->sm_periodic_state) {
1248                         case AD_FAST_PERIODIC:
1249                                 if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1250                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1251                                 }
1252                                 break;
1253                         case AD_SLOW_PERIODIC:
1254                                 if ((port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1255                                         // stop current timer
1256                                         port->sm_periodic_timer_counter = 0;
1257                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1258                                 }
1259                                 break;
1260                         default:    //to silence the compiler
1261                                 break;
1262                         }
1263                 }
1264         } else {
1265                 switch (port->sm_periodic_state) {
1266                 case AD_NO_PERIODIC:
1267                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1268                         break;
1269                 case AD_PERIODIC_TX:
1270                         if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1271                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1272                         } else {
1273                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1274                         }
1275                         break;
1276                 default:    //to silence the compiler
1277                         break;
1278                 }
1279         }
1280
1281         // check if the state machine was changed
1282         if (port->sm_periodic_state != last_state) {
1283                 dprintk("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1284                 switch (port->sm_periodic_state) {
1285                 case AD_NO_PERIODIC:
1286                         port->sm_periodic_timer_counter = 0;       // zero timer
1287                         break;
1288                 case AD_FAST_PERIODIC:
1289                         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
1290                         break;
1291                 case AD_SLOW_PERIODIC:
1292                         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
1293                         break;
1294                 case AD_PERIODIC_TX:
1295                         port->ntt = 1;
1296                         break;
1297                 default:    //to silence the compiler
1298                         break;
1299                 }
1300         }
1301 }
1302
1303 /**
1304  * ad_port_selection_logic - select aggregation groups
1305  * @port: the port we're looking at
1306  *
1307  * Select aggregation groups, and assign each port for it's aggregetor. The
1308  * selection logic is called in the inititalization (after all the handshkes),
1309  * and after every lacpdu receive (if selected is off).
1310  */
1311 static void ad_port_selection_logic(struct port *port)
1312 {
1313         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1314         struct port *last_port = NULL, *curr_port;
1315         int found = 0;
1316
1317         // if the port is already Selected, do nothing
1318         if (port->sm_vars & AD_PORT_SELECTED) {
1319                 return;
1320         }
1321
1322         // if the port is connected to other aggregator, detach it
1323         if (port->aggregator) {
1324                 // detach the port from its former aggregator
1325                 temp_aggregator=port->aggregator;
1326                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1327                         if (curr_port == port) {
1328                                 temp_aggregator->num_of_ports--;
1329                                 if (!last_port) {// if it is the first port attached to the aggregator
1330                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1331                                 } else {// not the first port attached to the aggregator
1332                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1333                                 }
1334
1335                                 // clear the port's relations to this aggregator
1336                                 port->aggregator = NULL;
1337                                 port->next_port_in_aggregator=NULL;
1338                                 port->actor_port_aggregator_identifier=0;
1339
1340                                 dprintk("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1341                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1342                                 if (!temp_aggregator->lag_ports) {
1343                                         ad_clear_agg(temp_aggregator);
1344                                 }
1345                                 break;
1346                         }
1347                 }
1348                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1349                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Port %d (on %s) was "
1350                                "related to aggregator %d but was not on its port list\n",
1351                                port->slave->dev->master->name,
1352                                port->actor_port_number, port->slave->dev->name,
1353                                port->aggregator->aggregator_identifier);
1354                 }
1355         }
1356         // search on all aggregators for a suitable aggregator for this port
1357         for (aggregator = __get_first_agg(port); aggregator;
1358              aggregator = __get_next_agg(aggregator)) {
1359
1360                 // keep a free aggregator for later use(if needed)
1361                 if (!aggregator->lag_ports) {
1362                         if (!free_aggregator) {
1363                                 free_aggregator=aggregator;
1364                         }
1365                         continue;
1366                 }
1367                 // check if current aggregator suits us
1368                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1369                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper_system)) &&
1370                      (aggregator->partner_system_priority == port->partner_oper_system_priority) &&
1371                      (aggregator->partner_oper_aggregator_key == port->partner_oper_key)
1372                     ) &&
1373                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper_system), &(null_mac_addr)) && // partner answers
1374                       !aggregator->is_individual)  // but is not individual OR
1375                     )
1376                    ) {
1377                         // attach to the founded aggregator
1378                         port->aggregator = aggregator;
1379                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1380                         port->next_port_in_aggregator=aggregator->lag_ports;
1381                         port->aggregator->num_of_ports++;
1382                         aggregator->lag_ports=port;
1383                         dprintk("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1384
1385                         // mark this port as selected
1386                         port->sm_vars |= AD_PORT_SELECTED;
1387                         found = 1;
1388                         break;
1389                 }
1390         }
1391
1392         // the port couldn't find an aggregator - attach it to a new aggregator
1393         if (!found) {
1394                 if (free_aggregator) {
1395                         // assign port a new aggregator
1396                         port->aggregator = free_aggregator;
1397                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1398
1399                         // update the new aggregator's parameters
1400                         // if port was responsed from the end-user
1401                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1402                                 port->aggregator->is_individual = 0;
1403                         } else {
1404                                 port->aggregator->is_individual = 1;
1405                         }
1406
1407                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1408                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1409                         port->aggregator->partner_system=port->partner_oper_system;
1410                         port->aggregator->partner_system_priority = port->partner_oper_system_priority;
1411                         port->aggregator->partner_oper_aggregator_key = port->partner_oper_key;
1412                         port->aggregator->receive_state = 1;
1413                         port->aggregator->transmit_state = 1;
1414                         port->aggregator->lag_ports = port;
1415                         port->aggregator->num_of_ports++;
1416
1417                         // mark this port as selected
1418                         port->sm_vars |= AD_PORT_SELECTED;
1419
1420                         dprintk("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1421                 } else {
1422                         printk(KERN_ERR DRV_NAME ": %s: Port %d (on %s) did not find a suitable aggregator\n",
1423                                port->slave->dev->master->name,
1424                                port->actor_port_number, port->slave->dev->name);
1425                 }
1426         }
1427         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1428         // else set ready=FALSE in all aggregator's ports
1429         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1430
1431         if (!__check_agg_selection_timer(port) && (aggregator = __get_first_agg(port))) {
1432                 ad_agg_selection_logic(aggregator);
1433         }
1434 }
1435
1436 /**
1437  * ad_agg_selection_logic - select an aggregation group for a team
1438  * @aggregator: the aggregator we're looking at
1439  *
1440  * It is assumed that only one aggregator may be selected for a team.
1441  * The logic of this function is to select (at first time) the aggregator with
1442  * the most ports attached to it, and to reselect the active aggregator only if
1443  * the previous aggregator has no more ports related to it.
1444  *
1445  * FIXME: this function MUST be called with the first agg in the bond, or
1446  * __get_active_agg() won't work correctly. This function should be better
1447  * called with the bond itself, and retrieve the first agg from it.
1448  */
1449 static void ad_agg_selection_logic(struct aggregator *aggregator)
1450 {
1451         struct aggregator *best_aggregator = NULL, *active_aggregator = NULL;
1452         struct aggregator *last_active_aggregator = NULL, *origin_aggregator;
1453         struct port *port;
1454         u16 num_of_aggs=0;
1455
1456         origin_aggregator = aggregator;
1457
1458         //get current active aggregator
1459         last_active_aggregator = __get_active_agg(aggregator);
1460
1461         // search for the aggregator with the most ports attached to it.
1462         do {
1463                 // count how many candidate lag's we have
1464                 if (aggregator->lag_ports) {
1465                         num_of_aggs++;
1466                 }
1467                 if (aggregator->is_active && !aggregator->is_individual &&   // if current aggregator is the active aggregator
1468                     MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr))) {   // and partner answers to 802.3ad PDUs
1469                         if (aggregator->num_of_ports) { // if any ports attached to the current aggregator
1470                                 best_aggregator=NULL;    // disregard the best aggregator that was chosen by now
1471                                 break;           // stop the selection of other aggregator if there are any ports attached to this active aggregator
1472                         } else { // no ports attached to this active aggregator
1473                                 aggregator->is_active = 0; // mark this aggregator as not active anymore
1474                         }
1475                 }
1476                 if (aggregator->num_of_ports) { // if any ports attached
1477                         if (best_aggregator) {  // if there is a candidte aggregator
1478                                 //The reasons for choosing new best aggregator:
1479                                 // 1. if current agg is NOT individual and the best agg chosen so far is individual OR
1480                                 // current and best aggs are both individual or both not individual, AND
1481                                 // 2a.  current agg partner reply but best agg partner do not reply OR
1482                                 // 2b.  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply AND
1483                                 //      current has more ports/bandwidth, or same amount of ports but current has faster ports, THEN
1484                                 //      current agg become best agg so far
1485
1486                                 //if current agg is NOT individual and the best agg chosen so far is individual change best_aggregator
1487                                 if (!aggregator->is_individual && best_aggregator->is_individual) {
1488                                         best_aggregator=aggregator;
1489                                 }
1490                                 // current and best aggs are both individual or both not individual
1491                                 else if ((aggregator->is_individual && best_aggregator->is_individual) ||
1492                                          (!aggregator->is_individual && !best_aggregator->is_individual)) {
1493                                         //  current and best aggs are both individual or both not individual AND
1494                                         //  current agg partner reply but best agg partner do not reply
1495                                         if ((MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1496                                              !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1497                                                 best_aggregator=aggregator;
1498                                         }
1499                                         //  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply
1500                                         else if (! (!MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1501                                                     MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1502                                                 if ((__get_agg_selection_mode(aggregator->lag_ports) == AD_BANDWIDTH)&&
1503                                                     (__get_agg_bandwidth(aggregator) > __get_agg_bandwidth(best_aggregator))) {
1504                                                         best_aggregator=aggregator;
1505                                                 } else if (__get_agg_selection_mode(aggregator->lag_ports) == AD_COUNT) {
1506                                                         if (((aggregator->num_of_ports > best_aggregator->num_of_ports) &&
1507                                                              (aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS))||
1508                                                             ((aggregator->num_of_ports == best_aggregator->num_of_ports) &&
1509                                                              ((u16)(aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS) >
1510                                                               (u16)(best_aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS)))) {
1511                                                                 best_aggregator=aggregator;
1512                                                         }
1513                                                 }
1514                                         }
1515                                 }
1516                         } else {
1517                                 best_aggregator=aggregator;
1518                         }
1519                 }
1520                 aggregator->is_active = 0; // mark all aggregators as not active anymore
1521         } while ((aggregator = __get_next_agg(aggregator)));
1522
1523         // if we have new aggregator selected, don't replace the old aggregator if it has an answering partner,
1524         // or if both old aggregator and new aggregator don't have answering partner
1525         if (best_aggregator) {
1526                 if (last_active_aggregator && last_active_aggregator->lag_ports && last_active_aggregator->lag_ports->is_enabled &&
1527                     (MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) ||   // partner answers OR
1528                      (!MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) &&      // both old and new
1529                       !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr))))     // partner do not answer
1530                    ) {
1531                         // if new aggregator has link, and old aggregator does not, replace old aggregator.(do nothing)
1532                         // -> don't replace otherwise.
1533                         if (!(!last_active_aggregator->actor_oper_aggregator_key && best_aggregator->actor_oper_aggregator_key)) {
1534                                 best_aggregator=NULL;
1535                                 last_active_aggregator->is_active = 1; // don't replace good old aggregator
1536
1537                         }
1538                 }
1539         }
1540
1541         // if there is new best aggregator, activate it
1542         if (best_aggregator) {
1543                 for (aggregator = __get_first_agg(best_aggregator->lag_ports);
1544                     aggregator;
1545                     aggregator = __get_next_agg(aggregator)) {
1546
1547                         dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1548                                         aggregator->aggregator_identifier, aggregator->num_of_ports,
1549                                         aggregator->actor_oper_aggregator_key, aggregator->partner_oper_aggregator_key,
1550                                         aggregator->is_individual, aggregator->is_active);
1551                 }
1552
1553                 // check if any partner replys
1554                 if (best_aggregator->is_individual) {
1555                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad response from "
1556                                "the link partner for any adapters in the bond\n",
1557                                best_aggregator->slave->dev->master->name);
1558                 }
1559
1560                 // check if there are more than one aggregator
1561                 if (num_of_aggs > 1) {
1562                         dprintk("Warning: More than one Link Aggregation Group was "
1563                                 "found in the bond. Only one group will function in the bond\n");
1564                 }
1565
1566                 best_aggregator->is_active = 1;
1567                 dprintk("LAG %d choosed as the active LAG\n", best_aggregator->aggregator_identifier);
1568                 dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1569                                 best_aggregator->aggregator_identifier, best_aggregator->num_of_ports,
1570                                 best_aggregator->actor_oper_aggregator_key, best_aggregator->partner_oper_aggregator_key,
1571                                 best_aggregator->is_individual, best_aggregator->is_active);
1572
1573                 // disable the ports that were related to the former active_aggregator
1574                 if (last_active_aggregator) {
1575                         for (port=last_active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1576                                 __disable_port(port);
1577                         }
1578                 }
1579         }
1580
1581         // if the selected aggregator is of join individuals(partner_system is NULL), enable their ports
1582         active_aggregator = __get_active_agg(origin_aggregator);
1583
1584         if (active_aggregator) {
1585                 if (!MAC_ADDRESS_COMPARE(&(active_aggregator->partner_system), &(null_mac_addr))) {
1586                         for (port=active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1587                                 __enable_port(port);
1588                         }
1589                 }
1590         }
1591 }
1592
1593 /**
1594  * ad_clear_agg - clear a given aggregator's parameters
1595  * @aggregator: the aggregator we're looking at
1596  *
1597  */
1598 static void ad_clear_agg(struct aggregator *aggregator)
1599 {
1600         if (aggregator) {
1601                 aggregator->is_individual = 0;
1602                 aggregator->actor_admin_aggregator_key = 0;
1603                 aggregator->actor_oper_aggregator_key = 0;
1604                 aggregator->partner_system = null_mac_addr;
1605                 aggregator->partner_system_priority = 0;
1606                 aggregator->partner_oper_aggregator_key = 0;
1607                 aggregator->receive_state = 0;
1608                 aggregator->transmit_state = 0;
1609                 aggregator->lag_ports = NULL;
1610                 aggregator->is_active = 0;
1611                 aggregator->num_of_ports = 0;
1612                 dprintk("LAG %d was cleared\n", aggregator->aggregator_identifier);
1613         }
1614 }
1615
1616 /**
1617  * ad_initialize_agg - initialize a given aggregator's parameters
1618  * @aggregator: the aggregator we're looking at
1619  *
1620  */
1621 static void ad_initialize_agg(struct aggregator *aggregator)
1622 {
1623         if (aggregator) {
1624                 ad_clear_agg(aggregator);
1625
1626                 aggregator->aggregator_mac_address = null_mac_addr;
1627                 aggregator->aggregator_identifier = 0;
1628                 aggregator->slave = NULL;
1629         }
1630 }
1631
1632 /**
1633  * ad_initialize_port - initialize a given port's parameters
1634  * @aggregator: the aggregator we're looking at
1635  * @lacp_fast: boolean. whether fast periodic should be used
1636  *
1637  */
1638 static void ad_initialize_port(struct port *port, int lacp_fast)
1639 {
1640         if (port) {
1641                 port->actor_port_number = 1;
1642                 port->actor_port_priority = 0xff;
1643                 port->actor_system = null_mac_addr;
1644                 port->actor_system_priority = 0xffff;
1645                 port->actor_port_aggregator_identifier = 0;
1646                 port->ntt = 0;
1647                 port->actor_admin_port_key = 1;
1648                 port->actor_oper_port_key  = 1;
1649                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1650                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1651
1652                 if (lacp_fast) {
1653                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1654                 }
1655
1656                 port->partner_admin_system = null_mac_addr;
1657                 port->partner_oper_system  = null_mac_addr;
1658                 port->partner_admin_system_priority = 0xffff;
1659                 port->partner_oper_system_priority  = 0xffff;
1660                 port->partner_admin_key = 1;
1661                 port->partner_oper_key  = 1;
1662                 port->partner_admin_port_number = 1;
1663                 port->partner_oper_port_number  = 1;
1664                 port->partner_admin_port_priority = 0xff;
1665                 port->partner_oper_port_priority  = 0xff;
1666                 port->partner_admin_port_state = 1;
1667                 port->partner_oper_port_state  = 1;
1668                 port->is_enabled = 1;
1669                 // ****** private parameters ******
1670                 port->sm_vars = 0x3;
1671                 port->sm_rx_state = 0;
1672                 port->sm_rx_timer_counter = 0;
1673                 port->sm_periodic_state = 0;
1674                 port->sm_periodic_timer_counter = 0;
1675                 port->sm_mux_state = 0;
1676                 port->sm_mux_timer_counter = 0;
1677                 port->sm_tx_state = 0;
1678                 port->sm_tx_timer_counter = 0;
1679                 port->slave = NULL;
1680                 port->aggregator = NULL;
1681                 port->next_port_in_aggregator = NULL;
1682                 port->transaction_id = 0;
1683
1684                 ad_initialize_lacpdu(&(port->lacpdu));
1685         }
1686 }
1687
1688 /**
1689  * ad_enable_collecting_distributing - enable a port's transmit/receive
1690  * @port: the port we're looking at
1691  *
1692  * Enable @port if it's in an active aggregator
1693  */
1694 static void ad_enable_collecting_distributing(struct port *port)
1695 {
1696         if (port->aggregator->is_active) {
1697                 dprintk("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1698                 __enable_port(port);
1699         }
1700 }
1701
1702 /**
1703  * ad_disable_collecting_distributing - disable a port's transmit/receive
1704  * @port: the port we're looking at
1705  *
1706  */
1707 static void ad_disable_collecting_distributing(struct port *port)
1708 {
1709         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1710                 dprintk("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1711                 __disable_port(port);
1712         }
1713 }
1714
1715 #if 0
1716 /**
1717  * ad_marker_info_send - send a marker information frame
1718  * @port: the port we're looking at
1719  *
1720  * This function does nothing since we decided not to implement send and handle
1721  * response for marker PDU's, in this stage, but only to respond to marker
1722  * information.
1723  */
1724 static void ad_marker_info_send(struct port *port)
1725 {
1726         struct marker marker;
1727         u16 index;
1728
1729         // fill the marker PDU with the appropriate values
1730         marker.subtype = 0x02;
1731         marker.version_number = 0x01;
1732         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1733         marker.marker_length = 0x16;
1734         // convert requester_port to Big Endian
1735         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1736         marker.requester_system = port->actor_system;
1737         // convert requester_port(u32) to Big Endian
1738         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1739         marker.pad = 0;
1740         marker.tlv_type_terminator = 0x00;
1741         marker.terminator_length = 0x00;
1742         for (index=0; index<90; index++) {
1743                 marker.reserved_90[index]=0;
1744         }
1745
1746         // send the marker information
1747         if (ad_marker_send(port, &marker) >= 0) {
1748                 dprintk("Sent Marker Information on port %d\n", port->actor_port_number);
1749         }
1750 }
1751 #endif
1752
1753 /**
1754  * ad_marker_info_received - handle receive of a Marker information frame
1755  * @marker_info: Marker info received
1756  * @port: the port we're looking at
1757  *
1758  */
1759 static void ad_marker_info_received(struct marker *marker_info,struct port *port)
1760 {
1761         struct marker marker;
1762
1763         // copy the received marker data to the response marker
1764         //marker = *marker_info;
1765         memcpy(&marker, marker_info, sizeof(struct marker));
1766         // change the marker subtype to marker response
1767         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1768         // send the marker response
1769
1770         if (ad_marker_send(port, &marker) >= 0) {
1771                 dprintk("Sent Marker Response on port %d\n", port->actor_port_number);
1772         }
1773 }
1774
1775 /**
1776  * ad_marker_response_received - handle receive of a marker response frame
1777  * @marker: marker PDU received
1778  * @port: the port we're looking at
1779  *
1780  * This function does nothing since we decided not to implement send and handle
1781  * response for marker PDU's, in this stage, but only to respond to marker
1782  * information.
1783  */
1784 static void ad_marker_response_received(struct marker *marker, struct port *port)
1785 {
1786         marker=NULL; // just to satisfy the compiler
1787         port=NULL;  // just to satisfy the compiler
1788         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1789 }
1790
1791 /**
1792  * ad_initialize_lacpdu - initialize a given lacpdu structure
1793  * @lacpdu: lacpdu structure to initialize
1794  *
1795  */
1796 static void ad_initialize_lacpdu(struct lacpdu *lacpdu)
1797 {
1798         u16 index;
1799
1800         // initialize lacpdu data
1801         lacpdu->subtype = 0x01;
1802         lacpdu->version_number = 0x01;
1803         lacpdu->tlv_type_actor_info = 0x01;
1804         lacpdu->actor_information_length = 0x14;
1805         // lacpdu->actor_system_priority    updated on send
1806         // lacpdu->actor_system             updated on send
1807         // lacpdu->actor_key                updated on send
1808         // lacpdu->actor_port_priority      updated on send
1809         // lacpdu->actor_port               updated on send
1810         // lacpdu->actor_state              updated on send
1811         lacpdu->tlv_type_partner_info = 0x02;
1812         lacpdu->partner_information_length = 0x14;
1813         for (index=0; index<=2; index++) {
1814                 lacpdu->reserved_3_1[index]=0;
1815         }
1816         // lacpdu->partner_system_priority  updated on send
1817         // lacpdu->partner_system           updated on send
1818         // lacpdu->partner_key              updated on send
1819         // lacpdu->partner_port_priority    updated on send
1820         // lacpdu->partner_port             updated on send
1821         // lacpdu->partner_state            updated on send
1822         for (index=0; index<=2; index++) {
1823                 lacpdu->reserved_3_2[index]=0;
1824         }
1825         lacpdu->tlv_type_collector_info = 0x03;
1826         lacpdu->collector_information_length= 0x10;
1827         lacpdu->collector_max_delay = AD_COLLECTOR_MAX_DELAY;
1828         for (index=0; index<=11; index++) {
1829                 lacpdu->reserved_12[index]=0;
1830         }
1831         lacpdu->tlv_type_terminator = 0x00;
1832         lacpdu->terminator_length = 0;
1833         for (index=0; index<=49; index++) {
1834                 lacpdu->reserved_50[index]=0;
1835         }
1836 }
1837
1838 //////////////////////////////////////////////////////////////////////////////////////
1839 // ================= AD exported functions to the main bonding code ==================
1840 //////////////////////////////////////////////////////////////////////////////////////
1841
1842 // Check aggregators status in team every T seconds
1843 #define AD_AGGREGATOR_SELECTION_TIMER  8
1844
1845 static u16 aggregator_identifier;
1846
1847 /**
1848  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1849  * @bond: bonding struct to work on
1850  * @tick_resolution: tick duration (millisecond resolution)
1851  * @lacp_fast: boolean. whether fast periodic should be used
1852  *
1853  * Can be called only after the mac address of the bond is set.
1854  */
1855 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1856 {
1857         // check that the bond is not initialized yet
1858         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr), &(bond->dev->dev_addr))) {
1859
1860                 aggregator_identifier = 0;
1861
1862                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1863                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1864                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1865
1866                 // initialize how many times this module is called in one second(should be about every 100ms)
1867                 ad_ticks_per_sec = tick_resolution;
1868
1869                 // initialize the aggregator selection timer(to activate an aggregation selection after initialize)
1870                 BOND_AD_INFO(bond).agg_select_timer = (AD_AGGREGATOR_SELECTION_TIMER * ad_ticks_per_sec);
1871                 BOND_AD_INFO(bond).agg_select_mode = AD_BANDWIDTH;
1872         }
1873 }
1874
1875 /**
1876  * bond_3ad_bind_slave - initialize a slave's port
1877  * @slave: slave struct to work on
1878  *
1879  * Returns:   0 on success
1880  *          < 0 on error
1881  */
1882 int bond_3ad_bind_slave(struct slave *slave)
1883 {
1884         struct bonding *bond = bond_get_bond_by_slave(slave);
1885         struct port *port;
1886         struct aggregator *aggregator;
1887
1888         if (bond == NULL) {
1889                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1890                        slave->dev->master->name, slave->dev->name);
1891                 return -1;
1892         }
1893
1894         //check that the slave has not been intialized yet.
1895         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1896
1897                 // port initialization
1898                 port = &(SLAVE_AD_INFO(slave).port);
1899
1900                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1901
1902                 port->slave = slave;
1903                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1904                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1905                 //              ------------------------------------------------------------
1906                 // Port key :   | User key                       |      Speed       |Duplex|
1907                 //              ------------------------------------------------------------
1908                 //              16                               6               1 0
1909                 port->actor_admin_port_key = 0; // initialize this parameter
1910                 port->actor_admin_port_key |= __get_duplex(port);
1911                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1912                 port->actor_oper_port_key = port->actor_admin_port_key;
1913                 // if the port is not full duplex, then the port should be not lacp Enabled
1914                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1915                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1916                 }
1917                 // actor system is the bond's system
1918                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1919                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1920                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1921                 port->aggregator = NULL;
1922                 port->next_port_in_aggregator = NULL;
1923
1924                 __disable_port(port);
1925                 __initialize_port_locks(port);
1926
1927
1928                 // aggregator initialization
1929                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1930
1931                 ad_initialize_agg(aggregator);
1932
1933                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1934                 aggregator->aggregator_identifier = (++aggregator_identifier);
1935                 aggregator->slave = slave;
1936                 aggregator->is_active = 0;
1937                 aggregator->num_of_ports = 0;
1938         }
1939
1940         return 0;
1941 }
1942
1943 /**
1944  * bond_3ad_unbind_slave - deinitialize a slave's port
1945  * @slave: slave struct to work on
1946  *
1947  * Search for the aggregator that is related to this port, remove the
1948  * aggregator and assign another aggregator for other port related to it
1949  * (if any), and remove the port.
1950  */
1951 void bond_3ad_unbind_slave(struct slave *slave)
1952 {
1953         struct port *port, *prev_port, *temp_port;
1954         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1955         int select_new_active_agg = 0;
1956
1957         // find the aggregator related to this slave
1958         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1959
1960         // find the port related to this slave
1961         port = &(SLAVE_AD_INFO(slave).port);
1962
1963         // if slave is null, the whole port is not initialized
1964         if (!port->slave) {
1965                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
1966                        "unbind an uninitialized port on %s\n",
1967                        slave->dev->master->name, slave->dev->name);
1968                 return;
1969         }
1970
1971         dprintk("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1972
1973         /* Tell the partner that this port is not suitable for aggregation */
1974         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1975         __update_lacpdu_from_port(port);
1976         ad_lacpdu_send(port);
1977
1978         // check if this aggregator is occupied
1979         if (aggregator->lag_ports) {
1980                 // check if there are other ports related to this aggregator except
1981                 // the port related to this slave(thats ensure us that there is a
1982                 // reason to search for new aggregator, and that we will find one
1983                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1984                         // find new aggregator for the related port(s)
1985                         new_aggregator = __get_first_agg(port);
1986                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1987                                 // if the new aggregator is empty, or it connected to to our port only
1988                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1989                                         break;
1990                                 }
1991                         }
1992                         // if new aggregator found, copy the aggregator's parameters
1993                         // and connect the related lag_ports to the new aggregator
1994                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1995                                 dprintk("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
1996
1997                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1998                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
1999                                                aggregator->slave->dev->master->name);
2000                                         // select new active aggregator
2001                                          select_new_active_agg = 1;
2002                                 }
2003
2004                                 new_aggregator->is_individual = aggregator->is_individual;
2005                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2006                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2007                                 new_aggregator->partner_system = aggregator->partner_system;
2008                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2009                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2010                                 new_aggregator->receive_state = aggregator->receive_state;
2011                                 new_aggregator->transmit_state = aggregator->transmit_state;
2012                                 new_aggregator->lag_ports = aggregator->lag_ports;
2013                                 new_aggregator->is_active = aggregator->is_active;
2014                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2015
2016                                 // update the information that is written on the ports about the aggregator
2017                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2018                                         temp_port->aggregator=new_aggregator;
2019                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2020                                 }
2021
2022                                 // clear the aggregator
2023                                 ad_clear_agg(aggregator);
2024
2025                                 if (select_new_active_agg) {
2026                                         ad_agg_selection_logic(__get_first_agg(port));
2027                                 }
2028                         } else {
2029                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2030                                        "and could not find a new aggregator for its ports\n",
2031                                        slave->dev->master->name);
2032                         }
2033                 } else { // in case that the only port related to this aggregator is the one we want to remove
2034                         select_new_active_agg = aggregator->is_active;
2035                         // clear the aggregator
2036                         ad_clear_agg(aggregator);
2037                         if (select_new_active_agg) {
2038                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2039                                        slave->dev->master->name);
2040                                 // select new active aggregator
2041                                 ad_agg_selection_logic(__get_first_agg(port));
2042                         }
2043                 }
2044         }
2045
2046         dprintk("Unbinding port %d\n", port->actor_port_number);
2047         // find the aggregator that this port is connected to
2048         temp_aggregator = __get_first_agg(port);
2049         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2050                 prev_port = NULL;
2051                 // search the port in the aggregator's related ports
2052                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2053                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2054                                 if (prev_port) {
2055                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2056                                 } else {
2057                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2058                                 }
2059                                 temp_aggregator->num_of_ports--;
2060                                 if (temp_aggregator->num_of_ports==0) {
2061                                         select_new_active_agg = temp_aggregator->is_active;
2062                                         // clear the aggregator
2063                                         ad_clear_agg(temp_aggregator);
2064                                         if (select_new_active_agg) {
2065                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2066                                                        slave->dev->master->name);
2067                                                 // select new active aggregator
2068                                                 ad_agg_selection_logic(__get_first_agg(port));
2069                                         }
2070                                 }
2071                                 break;
2072                         }
2073                 }
2074         }
2075         port->slave=NULL;
2076 }
2077
2078 /**
2079  * bond_3ad_state_machine_handler - handle state machines timeout
2080  * @bond: bonding struct to work on
2081  *
2082  * The state machine handling concept in this module is to check every tick
2083  * which state machine should operate any function. The execution order is
2084  * round robin, so when we have an interaction between state machines, the
2085  * reply of one to each other might be delayed until next tick.
2086  *
2087  * This function also complete the initialization when the agg_select_timer
2088  * times out, and it selects an aggregator for the ports that are yet not
2089  * related to any aggregator, and selects the active aggregator for a bond.
2090  */
2091 void bond_3ad_state_machine_handler(struct bonding *bond)
2092 {
2093         struct port *port;
2094         struct aggregator *aggregator;
2095
2096         read_lock(&bond->lock);
2097
2098         if (bond->kill_timers) {
2099                 goto out;
2100         }
2101
2102         //check if there are any slaves
2103         if (bond->slave_cnt == 0) {
2104                 goto re_arm;
2105         }
2106
2107         // check if agg_select_timer timer after initialize is timed out
2108         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2109                 // select the active aggregator for the bond
2110                 if ((port = __get_first_port(bond))) {
2111                         if (!port->slave) {
2112                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2113                                        "uninitialized\n", bond->dev->name);
2114                                 goto re_arm;
2115                         }
2116
2117                         aggregator = __get_first_agg(port);
2118                         ad_agg_selection_logic(aggregator);
2119                 }
2120         }
2121
2122         // for each port run the state machines
2123         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2124                 if (!port->slave) {
2125                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2126                                "port\n", bond->dev->name);
2127                         goto re_arm;
2128                 }
2129
2130                 ad_rx_machine(NULL, port);
2131                 ad_periodic_machine(port);
2132                 ad_port_selection_logic(port);
2133                 ad_mux_machine(port);
2134                 ad_tx_machine(port);
2135
2136                 // turn off the BEGIN bit, since we already handled it
2137                 if (port->sm_vars & AD_PORT_BEGIN) {
2138                         port->sm_vars &= ~AD_PORT_BEGIN;
2139                 }
2140         }
2141
2142 re_arm:
2143         mod_timer(&(BOND_AD_INFO(bond).ad_timer), jiffies + ad_delta_in_ticks);
2144 out:
2145         read_unlock(&bond->lock);
2146 }
2147
2148 /**
2149  * bond_3ad_rx_indication - handle a received frame
2150  * @lacpdu: received lacpdu
2151  * @slave: slave struct to work on
2152  * @length: length of the data received
2153  *
2154  * It is assumed that frames that were sent on this NIC don't returned as new
2155  * received frames (loopback). Since only the payload is given to this
2156  * function, it check for loopback.
2157  */
2158 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2159 {
2160         struct port *port;
2161
2162         if (length >= sizeof(struct lacpdu)) {
2163
2164                 port = &(SLAVE_AD_INFO(slave).port);
2165
2166                 if (!port->slave) {
2167                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2168                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2169                         return;
2170                 }
2171
2172                 switch (lacpdu->subtype) {
2173                 case AD_TYPE_LACPDU:
2174                         __ntohs_lacpdu(lacpdu);
2175                         dprintk("Received LACPDU on port %d\n", port->actor_port_number);
2176                         ad_rx_machine(lacpdu, port);
2177                         break;
2178
2179                 case AD_TYPE_MARKER:
2180                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2181
2182                         switch (((struct marker *)lacpdu)->tlv_type) {
2183                         case AD_MARKER_INFORMATION_SUBTYPE:
2184                                 dprintk("Received Marker Information on port %d\n", port->actor_port_number);
2185                                 ad_marker_info_received((struct marker *)lacpdu, port);
2186                                 break;
2187
2188                         case AD_MARKER_RESPONSE_SUBTYPE:
2189                                 dprintk("Received Marker Response on port %d\n", port->actor_port_number);
2190                                 ad_marker_response_received((struct marker *)lacpdu, port);
2191                                 break;
2192
2193                         default:
2194                                 dprintk("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2195                         }
2196                 }
2197         }
2198 }
2199
2200 /**
2201  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2202  * @slave: slave struct to work on
2203  *
2204  * Handle reselection of aggregator (if needed) for this port.
2205  */
2206 void bond_3ad_adapter_speed_changed(struct slave *slave)
2207 {
2208         struct port *port;
2209
2210         port = &(SLAVE_AD_INFO(slave).port);
2211
2212         // if slave is null, the whole port is not initialized
2213         if (!port->slave) {
2214                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2215                        "changed for uninitialized port on %s\n",
2216                        slave->dev->master->name, slave->dev->name);
2217                 return;
2218         }
2219
2220         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2221         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2222         dprintk("Port %d changed speed\n", port->actor_port_number);
2223         // there is no need to reselect a new aggregator, just signal the
2224         // state machines to reinitialize
2225         port->sm_vars |= AD_PORT_BEGIN;
2226 }
2227
2228 /**
2229  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2230  * @slave: slave struct to work on
2231  *
2232  * Handle reselection of aggregator (if needed) for this port.
2233  */
2234 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2235 {
2236         struct port *port;
2237
2238         port=&(SLAVE_AD_INFO(slave).port);
2239
2240         // if slave is null, the whole port is not initialized
2241         if (!port->slave) {
2242                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2243                        "for uninitialized port on %s\n",
2244                        slave->dev->master->name, slave->dev->name);
2245                 return;
2246         }
2247
2248         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2249         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2250         dprintk("Port %d changed duplex\n", port->actor_port_number);
2251         // there is no need to reselect a new aggregator, just signal the
2252         // state machines to reinitialize
2253         port->sm_vars |= AD_PORT_BEGIN;
2254 }
2255
2256 /**
2257  * bond_3ad_handle_link_change - handle a slave's link status change indication
2258  * @slave: slave struct to work on
2259  * @status: whether the link is now up or down
2260  *
2261  * Handle reselection of aggregator (if needed) for this port.
2262  */
2263 void bond_3ad_handle_link_change(struct slave *slave, char link)
2264 {
2265         struct port *port;
2266
2267         port = &(SLAVE_AD_INFO(slave).port);
2268
2269         // if slave is null, the whole port is not initialized
2270         if (!port->slave) {
2271                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2272                        "uninitialized port on %s\n",
2273                         slave->dev->master->name, slave->dev->name);
2274                 return;
2275         }
2276
2277         // 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)
2278         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2279         if (link == BOND_LINK_UP) {
2280                 port->is_enabled = 1;
2281                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2282                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2283                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2284                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2285         } else {
2286                 /* link has failed */
2287                 port->is_enabled = 0;
2288                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2289                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2290         }
2291         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2292         // there is no need to reselect a new aggregator, just signal the
2293         // state machines to reinitialize
2294         port->sm_vars |= AD_PORT_BEGIN;
2295 }
2296
2297 /**
2298  * bond_3ad_get_active_agg_info - get information of the active aggregator
2299  * @bond: bonding struct to work on
2300  * @ad_info: ad_info struct to fill with the bond's info
2301  *
2302  * Returns:   0 on success
2303  *          < 0 on error
2304  */
2305 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2306 {
2307         struct aggregator *aggregator = NULL;
2308         struct port *port;
2309
2310         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2311                 if (port->aggregator && port->aggregator->is_active) {
2312                         aggregator = port->aggregator;
2313                         break;
2314                 }
2315         }
2316
2317         if (aggregator) {
2318                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2319                 ad_info->ports = aggregator->num_of_ports;
2320                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2321                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2322                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2323                 return 0;
2324         }
2325
2326         return -1;
2327 }
2328
2329 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2330 {
2331         struct slave *slave, *start_at;
2332         struct bonding *bond = dev->priv;
2333         int slave_agg_no;
2334         int slaves_in_agg;
2335         int agg_id;
2336         int i;
2337         struct ad_info ad_info;
2338         int res = 1;
2339
2340         /* make sure that the slaves list will
2341          * not change during tx
2342          */
2343         read_lock(&bond->lock);
2344
2345         if (!BOND_IS_OK(bond)) {
2346                 goto out;
2347         }
2348
2349         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2350                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2351                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2352                 goto out;
2353         }
2354
2355         slaves_in_agg = ad_info.ports;
2356         agg_id = ad_info.aggregator_id;
2357
2358         if (slaves_in_agg == 0) {
2359                 /*the aggregator is empty*/
2360                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2361                        "aggregator is empty\n",
2362                        dev->name);
2363                 goto out;
2364         }
2365
2366         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2367
2368         bond_for_each_slave(bond, slave, i) {
2369                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2370
2371                 if (agg && (agg->aggregator_identifier == agg_id)) {
2372                         slave_agg_no--;
2373                         if (slave_agg_no < 0) {
2374                                 break;
2375                         }
2376                 }
2377         }
2378
2379         if (slave_agg_no >= 0) {
2380                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2381                        "for aggregator ID %d\n", dev->name, agg_id);
2382                 goto out;
2383         }
2384
2385         start_at = slave;
2386
2387         bond_for_each_slave_from(bond, slave, i, start_at) {
2388                 int slave_agg_id = 0;
2389                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2390
2391                 if (agg) {
2392                         slave_agg_id = agg->aggregator_identifier;
2393                 }
2394
2395                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2396                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2397                         break;
2398                 }
2399         }
2400
2401 out:
2402         if (res) {
2403                 /* no suitable interface, frame not sent */
2404                 dev_kfree_skb(skb);
2405         }
2406         read_unlock(&bond->lock);
2407         return 0;
2408 }
2409
2410 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2411 {
2412         struct bonding *bond = dev->priv;
2413         struct slave *slave = NULL;
2414         int ret = NET_RX_DROP;
2415
2416         if (!(dev->flags & IFF_MASTER))
2417                 goto out;
2418
2419         read_lock(&bond->lock);
2420         slave = bond_get_slave_by_dev((struct bonding *)dev->priv, orig_dev);
2421         if (!slave)
2422                 goto out_unlock;
2423
2424         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2425
2426         ret = NET_RX_SUCCESS;
2427
2428 out_unlock:
2429         read_unlock(&bond->lock);
2430 out:
2431         dev_kfree_skb(skb);
2432
2433         return ret;
2434 }
2435