git.oblomov.eu Git - linux-2.6/blob - drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 //#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 <net/net_namespace.h>
  33 #include "bonding.h"
  34 #include "bond_3ad.h"
  35
  36 // General definitions
  37 #define AD_SHORT_TIMEOUT           1
  38 #define AD_LONG_TIMEOUT            0
  39 #define AD_STANDBY                 0x2
  40 #define AD_MAX_TX_IN_SECOND        3
  41 #define AD_COLLECTOR_MAX_DELAY     0
  42
  43 // Timer definitions(43.4.4 in the 802.3ad standard)
  44 #define AD_FAST_PERIODIC_TIME      1
  45 #define AD_SLOW_PERIODIC_TIME      30
  46 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  47 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  48 #define AD_CHURN_DETECTION_TIME    60
  49 #define AD_AGGREGATE_WAIT_TIME     2
  50
  51 // Port state definitions(43.4.2.2 in the 802.3ad standard)
  52 #define AD_STATE_LACP_ACTIVITY   0x1
  53 #define AD_STATE_LACP_TIMEOUT    0x2
  54 #define AD_STATE_AGGREGATION     0x4
  55 #define AD_STATE_SYNCHRONIZATION 0x8
  56 #define AD_STATE_COLLECTING      0x10
  57 #define AD_STATE_DISTRIBUTING    0x20
  58 #define AD_STATE_DEFAULTED       0x40
  59 #define AD_STATE_EXPIRED         0x80
  60
  61 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
  62 #define AD_PORT_BEGIN           0x1
  63 #define AD_PORT_LACP_ENABLED    0x2
  64 #define AD_PORT_ACTOR_CHURN     0x4
  65 #define AD_PORT_PARTNER_CHURN   0x8
  66 #define AD_PORT_READY           0x10
  67 #define AD_PORT_READY_N         0x20
  68 #define AD_PORT_MATCHED         0x40
  69 #define AD_PORT_STANDBY         0x80
  70 #define AD_PORT_SELECTED        0x100
  71 #define AD_PORT_MOVED           0x200
  72
  73 // Port Key definitions
  74 // key is determined according to the link speed, duplex and
  75 // user key(which is yet not supported)
  76 //              ------------------------------------------------------------
  77 // Port key :   | User key                       |      Speed       |Duplex|
  78 //              ------------------------------------------------------------
  79 //              16                               6               1 0
  80 #define  AD_DUPLEX_KEY_BITS    0x1
  81 #define  AD_SPEED_KEY_BITS     0x3E
  82 #define  AD_USER_KEY_BITS      0xFFC0
  83
  84 //dalloun
  85 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  86 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  87 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  88 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  89 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  90 //endalloun
  91
  92 // compare MAC addresses
  93 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  94
  95 static struct mac_addr null_mac_addr = {{0, 0, 0, 0, 0, 0}};
  96 static u16 ad_ticks_per_sec;
  97 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  98
  99 // ================= 3AD api to bonding and kernel code ==================
 100 static u16 __get_link_speed(struct port *port);
 101 static u8 __get_duplex(struct port *port);
 102 static inline void __initialize_port_locks(struct port *port);
 103 //conversions
 104 static u16 __ad_timer_to_ticks(u16 timer_type, u16 Par);
 105
 106
 107 // ================= ad code helper functions ==================
 108 //needed by ad_rx_machine(...)
 109 static void __record_pdu(struct lacpdu *lacpdu, struct port *port);
 110 static void __record_default(struct port *port);
 111 static void __update_selected(struct lacpdu *lacpdu, struct port *port);
 112 static void __update_default_selected(struct port *port);
 113 static void __choose_matched(struct lacpdu *lacpdu, struct port *port);
 114 static void __update_ntt(struct lacpdu *lacpdu, struct port *port);
 115
 116 //needed for ad_mux_machine(..)
 117 static void __attach_bond_to_agg(struct port *port);
 118 static void __detach_bond_from_agg(struct port *port);
 119 static int __agg_ports_are_ready(struct aggregator *aggregator);
 120 static void __set_agg_ports_ready(struct aggregator *aggregator, int val);
 121
 122 //needed for ad_agg_selection_logic(...)
 123 static u32 __get_agg_bandwidth(struct aggregator *aggregator);
 124 static struct aggregator *__get_active_agg(struct aggregator *aggregator);
 125
 126
 127 // ================= main 802.3ad protocol functions ==================
 128 static int ad_lacpdu_send(struct port *port);
 129 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 130 static void ad_mux_machine(struct port *port);
 131 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 132 static void ad_tx_machine(struct port *port);
 133 static void ad_periodic_machine(struct port *port);
 134 static void ad_port_selection_logic(struct port *port);
 135 static void ad_agg_selection_logic(struct aggregator *aggregator);
 136 static void ad_clear_agg(struct aggregator *aggregator);
 137 static void ad_initialize_agg(struct aggregator *aggregator);
 138 static void ad_initialize_port(struct port *port, int lacp_fast);
 139 static void ad_initialize_lacpdu(struct lacpdu *Lacpdu);
 140 static void ad_enable_collecting_distributing(struct port *port);
 141 static void ad_disable_collecting_distributing(struct port *port);
 142 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 143 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 144
 145
 146 /////////////////////////////////////////////////////////////////////////////////
 147 // ================= api to bonding and kernel code ==================
 148 /////////////////////////////////////////////////////////////////////////////////
 149
 150 /**
 151  * __get_bond_by_port - get the port's bonding struct
 152  * @port: the port we're looking at
 153  *
 154  * Return @port's bonding struct, or %NULL if it can't be found.
 155  */
 156 static inline struct bonding *__get_bond_by_port(struct port *port)
 157 {
 158         if (port->slave == NULL) {
 159                 return NULL;
 160         }
 161
 162         return bond_get_bond_by_slave(port->slave);
 163 }
 164
 165 /**
 166  * __get_first_port - get the first port in the bond
 167  * @bond: the bond we're looking at
 168  *
 169  * Return the port of the first slave in @bond, or %NULL if it can't be found.
 170  */
 171 static inline struct port *__get_first_port(struct bonding *bond)
 172 {
 173         if (bond->slave_cnt == 0) {
 174                 return NULL;
 175         }
 176
 177         return &(SLAVE_AD_INFO(bond->first_slave).port);
 178 }
 179
 180 /**
 181  * __get_next_port - get the next port in the bond
 182  * @port: the port we're looking at
 183  *
 184  * Return the port of the slave that is next in line of @port's slave in the
 185  * bond, or %NULL if it can't be found.
 186  */
 187 static inline struct port *__get_next_port(struct port *port)
 188 {
 189         struct bonding *bond = __get_bond_by_port(port);
 190         struct slave *slave = port->slave;
 191
 192         // If there's no bond for this port, or this is the last slave
 193         if ((bond == NULL) || (slave->next == bond->first_slave)) {
 194                 return NULL;
 195         }
 196
 197         return &(SLAVE_AD_INFO(slave->next).port);
 198 }
 199
 200 /**
 201  * __get_first_agg - get the first aggregator in the bond
 202  * @bond: the bond we're looking at
 203  *
 204  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 205  * found.
 206  */
 207 static inline struct aggregator *__get_first_agg(struct port *port)
 208 {
 209         struct bonding *bond = __get_bond_by_port(port);
 210
 211         // If there's no bond for this port, or bond has no slaves
 212         if ((bond == NULL) || (bond->slave_cnt == 0)) {
 213                 return NULL;
 214         }
 215
 216         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
 217 }
 218
 219 /**
 220  * __get_next_agg - get the next aggregator in the bond
 221  * @aggregator: the aggregator we're looking at
 222  *
 223  * Return the aggregator of the slave that is next in line of @aggregator's
 224  * slave in the bond, or %NULL if it can't be found.
 225  */
 226 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
 227 {
 228         struct slave *slave = aggregator->slave;
 229         struct bonding *bond = bond_get_bond_by_slave(slave);
 230
 231         // If there's no bond for this aggregator, or this is the last slave
 232         if ((bond == NULL) || (slave->next == bond->first_slave)) {
 233                 return NULL;
 234         }
 235
 236         return &(SLAVE_AD_INFO(slave->next).aggregator);
 237 }
 238
 239 /**
 240  * __disable_port - disable the port's slave
 241  * @port: the port we're looking at
 242  *
 243  */
 244 static inline void __disable_port(struct port *port)
 245 {
 246         bond_set_slave_inactive_flags(port->slave);
 247 }
 248
 249 /**
 250  * __enable_port - enable the port's slave, if it's up
 251  * @port: the port we're looking at
 252  *
 253  */
 254 static inline void __enable_port(struct port *port)
 255 {
 256         struct slave *slave = port->slave;
 257
 258         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev)) {
 259                 bond_set_slave_active_flags(slave);
 260         }
 261 }
 262
 263 /**
 264  * __port_is_enabled - check if the port's slave is in active state
 265  * @port: the port we're looking at
 266  *
 267  */
 268 static inline int __port_is_enabled(struct port *port)
 269 {
 270         return(port->slave->state == BOND_STATE_ACTIVE);
 271 }
 272
 273 /**
 274  * __get_agg_selection_mode - get the aggregator selection mode
 275  * @port: the port we're looking at
 276  *
 277  * Get the aggregator selection mode. Can be %BANDWIDTH or %COUNT.
 278  */
 279 static inline u32 __get_agg_selection_mode(struct port *port)
 280 {
 281         struct bonding *bond = __get_bond_by_port(port);
 282
 283         if (bond == NULL) {
 284                 return AD_BANDWIDTH;
 285         }
 286
 287         return BOND_AD_INFO(bond).agg_select_mode;
 288 }
 289
 290 /**
 291  * __check_agg_selection_timer - check if the selection timer has expired
 292  * @port: the port we're looking at
 293  *
 294  */
 295 static inline int __check_agg_selection_timer(struct port *port)
 296 {
 297         struct bonding *bond = __get_bond_by_port(port);
 298
 299         if (bond == NULL) {
 300                 return 0;
 301         }
 302
 303         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 304 }
 305
 306 /**
 307  * __get_rx_machine_lock - lock the port's RX machine
 308  * @port: the port we're looking at
 309  *
 310  */
 311 static inline void __get_rx_machine_lock(struct port *port)
 312 {
 313         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 314 }
 315
 316 /**
 317  * __release_rx_machine_lock - unlock the port's RX machine
 318  * @port: the port we're looking at
 319  *
 320  */
 321 static inline void __release_rx_machine_lock(struct port *port)
 322 {
 323         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 324 }
 325
 326 /**
 327  * __get_link_speed - get a port's speed
 328  * @port: the port we're looking at
 329  *
 330  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 331  *     0,
 332  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 333  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 334  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 335  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 336  */
 337 static u16 __get_link_speed(struct port *port)
 338 {
 339         struct slave *slave = port->slave;
 340         u16 speed;
 341
 342         /* this if covers only a special case: when the configuration starts with
 343          * link down, it sets the speed to 0.
 344          * This is done in spite of the fact that the e100 driver reports 0 to be
 345          * compatible with MVT in the future.*/
 346         if (slave->link != BOND_LINK_UP) {
 347                 speed=0;
 348         } else {
 349                 switch (slave->speed) {
 350                 case SPEED_10:
 351                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 352                         break;
 353
 354                 case SPEED_100:
 355                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 356                         break;
 357
 358                 case SPEED_1000:
 359                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 360                         break;
 361
 362                 case SPEED_10000:
 363                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 364                         break;
 365
 366                 default:
 367                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 368                         break;
 369                 }
 370         }
 371
 372         dprintk("Port %d Received link speed %d update from adapter\n", port->actor_port_number, speed);
 373         return speed;
 374 }
 375
 376 /**
 377  * __get_duplex - get a port's duplex
 378  * @port: the port we're looking at
 379  *
 380  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 381  *     0x01 if in full duplex
 382  *     0x00 otherwise
 383  */
 384 static u8 __get_duplex(struct port *port)
 385 {
 386         struct slave *slave = port->slave;
 387
 388         u8 retval;
 389
 390         //  handling a special case: when the configuration starts with
 391         // link down, it sets the duplex to 0.
 392         if (slave->link != BOND_LINK_UP) {
 393                 retval=0x0;
 394         } else {
 395                 switch (slave->duplex) {
 396                 case DUPLEX_FULL:
 397                         retval=0x1;
 398                         dprintk("Port %d Received status full duplex update from adapter\n", port->actor_port_number);
 399                         break;
 400                 case DUPLEX_HALF:
 401                 default:
 402                         retval=0x0;
 403                         dprintk("Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number);
 404                         break;
 405                 }
 406         }
 407         return retval;
 408 }
 409
 410 /**
 411  * __initialize_port_locks - initialize a port's RX machine spinlock
 412  * @port: the port we're looking at
 413  *
 414  */
 415 static inline void __initialize_port_locks(struct port *port)
 416 {
 417         // make sure it isn't called twice
 418         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 419 }
 420
 421 //conversions
 422
 423 /**
 424  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 425  * @timer_type: which timer to operate
 426  * @par: timer parameter. see below
 427  *
 428  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 429  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 430  *                                                  %SLOW_PERIODIC_TIME.
 431  */
 432 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 433 {
 434         u16 retval=0;    //to silence the compiler
 435
 436         switch (timer_type) {
 437         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 438                 if (par) {            // for short or long timeout
 439                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 440                 } else {
 441                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 442                 }
 443                 break;
 444         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 445                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 446                 break;
 447         case AD_PERIODIC_TIMER:     // for periodic machine
 448                 retval = (par*ad_ticks_per_sec); // long timeout
 449                 break;
 450         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 451                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 452                 break;
 453         case AD_WAIT_WHILE_TIMER:           // for selection machine
 454                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 455                 break;
 456         }
 457         return retval;
 458 }
 459
 460
 461 /////////////////////////////////////////////////////////////////////////////////
 462 // ================= ad_rx_machine helper functions ==================
 463 /////////////////////////////////////////////////////////////////////////////////
 464
 465 /**
 466  * __record_pdu - record parameters from a received lacpdu
 467  * @lacpdu: the lacpdu we've received
 468  * @port: the port we're looking at
 469  *
 470  * Record the parameter values for the Actor carried in a received lacpdu as
 471  * the current partner operational parameter values and sets
 472  * actor_oper_port_state.defaulted to FALSE.
 473  */
 474 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 475 {
 476         // validate lacpdu and port
 477         if (lacpdu && port) {
 478                 // record the new parameter values for the partner operational
 479                 port->partner_oper_port_number = ntohs(lacpdu->actor_port);
 480                 port->partner_oper_port_priority = ntohs(lacpdu->actor_port_priority);
 481                 port->partner_oper_system = lacpdu->actor_system;
 482                 port->partner_oper_system_priority = ntohs(lacpdu->actor_system_priority);
 483                 port->partner_oper_key = ntohs(lacpdu->actor_key);
 484                 // zero partener's lase states
 485                 port->partner_oper_port_state = 0;
 486                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_ACTIVITY);
 487                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_TIMEOUT);
 488                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_AGGREGATION);
 489                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION);
 490                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_COLLECTING);
 491                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DISTRIBUTING);
 492                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DEFAULTED);
 493                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_EXPIRED);
 494
 495                 // set actor_oper_port_state.defaulted to FALSE
 496                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 497
 498                 // set the partner sync. to on if the partner is sync. and the port is matched
 499                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 500                         port->partner_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 501                 } else {
 502                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 503                 }
 504         }
 505 }
 506
 507 /**
 508  * __record_default - record default parameters
 509  * @port: the port we're looking at
 510  *
 511  * This function records the default parameter values for the partner carried
 512  * in the Partner Admin parameters as the current partner operational parameter
 513  * values and sets actor_oper_port_state.defaulted to TRUE.
 514  */
 515 static void __record_default(struct port *port)
 516 {
 517         // validate the port
 518         if (port) {
 519                 // record the partner admin parameters
 520                 port->partner_oper_port_number = port->partner_admin_port_number;
 521                 port->partner_oper_port_priority = port->partner_admin_port_priority;
 522                 port->partner_oper_system = port->partner_admin_system;
 523                 port->partner_oper_system_priority = port->partner_admin_system_priority;
 524                 port->partner_oper_key = port->partner_admin_key;
 525                 port->partner_oper_port_state = port->partner_admin_port_state;
 526
 527                 // set actor_oper_port_state.defaulted to true
 528                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 529         }
 530 }
 531
 532 /**
 533  * __update_selected - update a port's Selected variable from a received lacpdu
 534  * @lacpdu: the lacpdu we've received
 535  * @port: the port we're looking at
 536  *
 537  * Update the value of the selected variable, using parameter values from a
 538  * newly received lacpdu. The parameter values for the Actor carried in the
 539  * received PDU are compared with the corresponding operational parameter
 540  * values for the ports partner. If one or more of the comparisons shows that
 541  * the value(s) received in the PDU differ from the current operational values,
 542  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 543  * set to out_of_sync. Otherwise, selected remains unchanged.
 544  */
 545 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 546 {
 547         // validate lacpdu and port
 548         if (lacpdu && port) {
 549                 // check if any parameter is different
 550                 if ((ntohs(lacpdu->actor_port) != port->partner_oper_port_number) ||
 551                     (ntohs(lacpdu->actor_port_priority) != port->partner_oper_port_priority) ||
 552                     MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->partner_oper_system)) ||
 553                     (ntohs(lacpdu->actor_system_priority) != port->partner_oper_system_priority) ||
 554                     (ntohs(lacpdu->actor_key) != port->partner_oper_key) ||
 555                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
 556                    ) {
 557                         // update the state machine Selected variable
 558                         port->sm_vars &= ~AD_PORT_SELECTED;
 559                 }
 560         }
 561 }
 562
 563 /**
 564  * __update_default_selected - update a port's Selected variable from Partner
 565  * @port: the port we're looking at
 566  *
 567  * This function updates the value of the selected variable, using the partner
 568  * administrative parameter values. The administrative values are compared with
 569  * the corresponding operational parameter values for the partner. If one or
 570  * more of the comparisons shows that the administrative value(s) differ from
 571  * the current operational values, then Selected is set to FALSE and
 572  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 573  * Selected remains unchanged.
 574  */
 575 static void __update_default_selected(struct port *port)
 576 {
 577         // validate the port
 578         if (port) {
 579                 // check if any parameter is different
 580                 if ((port->partner_admin_port_number != port->partner_oper_port_number) ||
 581                     (port->partner_admin_port_priority != port->partner_oper_port_priority) ||
 582                     MAC_ADDRESS_COMPARE(&(port->partner_admin_system), &(port->partner_oper_system)) ||
 583                     (port->partner_admin_system_priority != port->partner_oper_system_priority) ||
 584                     (port->partner_admin_key != port->partner_oper_key) ||
 585                     ((port->partner_admin_port_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
 586                    ) {
 587                         // update the state machine Selected variable
 588                         port->sm_vars &= ~AD_PORT_SELECTED;
 589                 }
 590         }
 591 }
 592
 593 /**
 594  * __choose_matched - update a port's matched variable from a received lacpdu
 595  * @lacpdu: the lacpdu we've received
 596  * @port: the port we're looking at
 597  *
 598  * Update the value of the matched variable, using parameter values from a
 599  * newly received lacpdu. Parameter values for the partner carried in the
 600  * received PDU are compared with the corresponding operational parameter
 601  * values for the actor. Matched is set to TRUE if all of these parameters
 602  * match and the PDU parameter partner_state.aggregation has the same value as
 603  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 604  * in the aggregation. Matched is also set to TRUE if the value of
 605  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 606  * an individual link and lacp will actively maintain the link. Otherwise,
 607  * matched is set to FALSE. LACP is considered to be actively maintaining the
 608  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 609  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 610  * partner_state.lacp_activity variables are TRUE.
 611  */
 612 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 613 {
 614         // validate lacpdu and port
 615         if (lacpdu && port) {
 616                 // check if all parameters are alike
 617                 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 618                      (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 619                      !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 620                      (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 621                      (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 622                      ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 623                     // or this is individual link(aggregation == FALSE)
 624                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 625                    ) {
 626                         // update the state machine Matched variable
 627                         port->sm_vars |= AD_PORT_MATCHED;
 628                 } else {
 629                         port->sm_vars &= ~AD_PORT_MATCHED;
 630                 }
 631         }
 632 }
 633
 634 /**
 635  * __update_ntt - update a port's ntt variable from a received lacpdu
 636  * @lacpdu: the lacpdu we've received
 637  * @port: the port we're looking at
 638  *
 639  * Updates the value of the ntt variable, using parameter values from a newly
 640  * received lacpdu. The parameter values for the partner carried in the
 641  * received PDU are compared with the corresponding operational parameter
 642  * values for the Actor. If one or more of the comparisons shows that the
 643  * value(s) received in the PDU differ from the current operational values,
 644  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 645  */
 646 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 647 {
 648         // validate lacpdu and port
 649         if (lacpdu && port) {
 650                 // check if any parameter is different
 651                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 652                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 653                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 654                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 655                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 656                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 657                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 658                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 659                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 660                    ) {
 661                         // set ntt to be TRUE
 662                         port->ntt = 1;
 663                 }
 664         }
 665 }
 666
 667 /**
 668  * __attach_bond_to_agg
 669  * @port: the port we're looking at
 670  *
 671  * Handle the attaching of the port's control parser/multiplexer and the
 672  * aggregator. This function does nothing since the parser/multiplexer of the
 673  * receive and the parser/multiplexer of the aggregator are already combined.
 674  */
 675 static void __attach_bond_to_agg(struct port *port)
 676 {
 677         port=NULL; // just to satisfy the compiler
 678         // This function does nothing since the parser/multiplexer of the receive
 679         // and the parser/multiplexer of the aggregator are already combined
 680 }
 681
 682 /**
 683  * __detach_bond_from_agg
 684  * @port: the port we're looking at
 685  *
 686  * Handle the detaching of the port's control parser/multiplexer from the
 687  * aggregator. This function does nothing since the parser/multiplexer of the
 688  * receive and the parser/multiplexer of the aggregator are already combined.
 689  */
 690 static void __detach_bond_from_agg(struct port *port)
 691 {
 692         port=NULL; // just to satisfy the compiler
 693         // This function does nothing sience the parser/multiplexer of the receive
 694         // and the parser/multiplexer of the aggregator are already combined
 695 }
 696
 697 /**
 698  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 699  * @aggregator: the aggregator we're looking at
 700  *
 701  */
 702 static int __agg_ports_are_ready(struct aggregator *aggregator)
 703 {
 704         struct port *port;
 705         int retval = 1;
 706
 707         if (aggregator) {
 708                 // scan all ports in this aggregator to verfy if they are all ready
 709                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 710                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 711                                 retval = 0;
 712                                 break;
 713                         }
 714                 }
 715         }
 716
 717         return retval;
 718 }
 719
 720 /**
 721  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 722  * @aggregator: the aggregator we're looking at
 723  * @val: Should the ports' ready bit be set on or off
 724  *
 725  */
 726 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 727 {
 728         struct port *port;
 729
 730         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 731                 if (val) {
 732                         port->sm_vars |= AD_PORT_READY;
 733                 } else {
 734                         port->sm_vars &= ~AD_PORT_READY;
 735                 }
 736         }
 737 }
 738
 739 /**
 740  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 741  * @aggregator: the aggregator we're looking at
 742  *
 743  */
 744 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 745 {
 746         u32 bandwidth=0;
 747         u32 basic_speed;
 748
 749         if (aggregator->num_of_ports) {
 750                 basic_speed = __get_link_speed(aggregator->lag_ports);
 751                 switch (basic_speed) {
 752                 case AD_LINK_SPEED_BITMASK_1MBPS:
 753                         bandwidth = aggregator->num_of_ports;
 754                         break;
 755                 case AD_LINK_SPEED_BITMASK_10MBPS:
 756                         bandwidth = aggregator->num_of_ports * 10;
 757                         break;
 758                 case AD_LINK_SPEED_BITMASK_100MBPS:
 759                         bandwidth = aggregator->num_of_ports * 100;
 760                         break;
 761                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 762                         bandwidth = aggregator->num_of_ports * 1000;
 763                         break;
 764                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 765                         bandwidth = aggregator->num_of_ports * 10000;
 766                         break;
 767                 default:
 768                         bandwidth=0; // to silent the compilor ....
 769                 }
 770         }
 771         return bandwidth;
 772 }
 773
 774 /**
 775  * __get_active_agg - get the current active aggregator
 776  * @aggregator: the aggregator we're looking at
 777  *
 778  */
 779 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 780 {
 781         struct aggregator *retval = NULL;
 782
 783         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 784                 if (aggregator->is_active) {
 785                         retval = aggregator;
 786                         break;
 787                 }
 788         }
 789
 790         return retval;
 791 }
 792
 793 /**
 794  * __update_lacpdu_from_port - update a port's lacpdu fields
 795  * @port: the port we're looking at
 796  *
 797  */
 798 static inline void __update_lacpdu_from_port(struct port *port)
 799 {
 800         struct lacpdu *lacpdu = &port->lacpdu;
 801
 802         /* update current actual Actor parameters */
 803         /* lacpdu->subtype                   initialized
 804          * lacpdu->version_number            initialized
 805          * lacpdu->tlv_type_actor_info       initialized
 806          * lacpdu->actor_information_length  initialized
 807          */
 808
 809         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 810         lacpdu->actor_system = port->actor_system;
 811         lacpdu->actor_key = htons(port->actor_oper_port_key);
 812         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 813         lacpdu->actor_port = htons(port->actor_port_number);
 814         lacpdu->actor_state = port->actor_oper_port_state;
 815
 816         /* lacpdu->reserved_3_1              initialized
 817          * lacpdu->tlv_type_partner_info     initialized
 818          * lacpdu->partner_information_length initialized
 819          */
 820
 821         lacpdu->partner_system_priority = htons(port->partner_oper_system_priority);
 822         lacpdu->partner_system = port->partner_oper_system;
 823         lacpdu->partner_key = htons(port->partner_oper_key);
 824         lacpdu->partner_port_priority = htons(port->partner_oper_port_priority);
 825         lacpdu->partner_port = htons(port->partner_oper_port_number);
 826         lacpdu->partner_state = port->partner_oper_port_state;
 827
 828         /* lacpdu->reserved_3_2              initialized
 829          * lacpdu->tlv_type_collector_info   initialized
 830          * lacpdu->collector_information_length initialized
 831          * collector_max_delay                initialized
 832          * reserved_12[12]                   initialized
 833          * tlv_type_terminator               initialized
 834          * terminator_length                 initialized
 835          * reserved_50[50]                   initialized
 836          */
 837 }
 838
 839 //////////////////////////////////////////////////////////////////////////////////////
 840 // ================= main 802.3ad protocol code ======================================
 841 //////////////////////////////////////////////////////////////////////////////////////
 842
 843 /**
 844  * ad_lacpdu_send - send out a lacpdu packet on a given port
 845  * @port: the port we're looking at
 846  *
 847  * Returns:   0 on success
 848  *          < 0 on error
 849  */
 850 static int ad_lacpdu_send(struct port *port)
 851 {
 852         struct slave *slave = port->slave;
 853         struct sk_buff *skb;
 854         struct lacpdu_header *lacpdu_header;
 855         int length = sizeof(struct lacpdu_header);
 856         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 857
 858         skb = dev_alloc_skb(length);
 859         if (!skb) {
 860                 return -ENOMEM;
 861         }
 862
 863         skb->dev = slave->dev;
 864         skb_reset_mac_header(skb);
 865         skb->network_header = skb->mac_header + ETH_HLEN;
 866         skb->protocol = PKT_TYPE_LACPDU;
 867         skb->priority = TC_PRIO_CONTROL;
 868
 869         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 870
 871         lacpdu_header->ad_header.destination_address = lacpdu_multicast_address;
 872         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 873            to identify loopback lacpdus in receive. */
 874         lacpdu_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 875         lacpdu_header->ad_header.length_type = PKT_TYPE_LACPDU;
 876
 877         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 878
 879         dev_queue_xmit(skb);
 880
 881         return 0;
 882 }
 883
 884 /**
 885  * ad_marker_send - send marker information/response on a given port
 886  * @port: the port we're looking at
 887  * @marker: marker data to send
 888  *
 889  * Returns:   0 on success
 890  *          < 0 on error
 891  */
 892 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 893 {
 894         struct slave *slave = port->slave;
 895         struct sk_buff *skb;
 896         struct bond_marker_header *marker_header;
 897         int length = sizeof(struct bond_marker_header);
 898         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 899
 900         skb = dev_alloc_skb(length + 16);
 901         if (!skb) {
 902                 return -ENOMEM;
 903         }
 904
 905         skb_reserve(skb, 16);
 906
 907         skb->dev = slave->dev;
 908         skb_reset_mac_header(skb);
 909         skb->network_header = skb->mac_header + ETH_HLEN;
 910         skb->protocol = PKT_TYPE_LACPDU;
 911
 912         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 913
 914         marker_header->ad_header.destination_address = lacpdu_multicast_address;
 915         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 916            to identify loopback MARKERs in receive. */
 917         marker_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 918         marker_header->ad_header.length_type = PKT_TYPE_LACPDU;
 919
 920         marker_header->marker = *marker; // struct copy
 921
 922         dev_queue_xmit(skb);
 923
 924         return 0;
 925 }
 926
 927 /**
 928  * ad_mux_machine - handle a port's mux state machine
 929  * @port: the port we're looking at
 930  *
 931  */
 932 static void ad_mux_machine(struct port *port)
 933 {
 934         mux_states_t last_state;
 935
 936         // keep current State Machine state to compare later if it was changed
 937         last_state = port->sm_mux_state;
 938
 939         if (port->sm_vars & AD_PORT_BEGIN) {
 940                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 941         } else {
 942                 switch (port->sm_mux_state) {
 943                 case AD_MUX_DETACHED:
 944                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
 945                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 946                         }
 947                         break;
 948                 case AD_MUX_WAITING:
 949                         // if SELECTED == FALSE return to DETACH state
 950                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 951                                 port->sm_vars &= ~AD_PORT_READY_N;
 952                                 // in order to withhold the Selection Logic to check all ports READY_N value
 953                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 954                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 955                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 956                                 break;
 957                         }
 958
 959                         // check if the wait_while_timer expired
 960                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
 961                                 port->sm_vars |= AD_PORT_READY_N;
 962                         }
 963
 964                         // in order to withhold the selection logic to check all ports READY_N value
 965                         // every callback cycle to update ready variable, we check READY_N and update READY here
 966                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 967
 968                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 969                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
 970                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 971                         }
 972                         break;
 973                 case AD_MUX_ATTACHED:
 974                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 975                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 976                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 977                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 978                                 port->sm_vars &= ~AD_PORT_READY_N;
 979                                 // in order to withhold the selection logic to check all ports READY_N value
 980                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 981                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 982                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 983                         }
 984                         break;
 985                 case AD_MUX_COLLECTING_DISTRIBUTING:
 986                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 987                             !(port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION)
 988                            ) {
 989                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 990
 991                         } else {
 992                                 // if port state hasn't changed make
 993                                 // sure that a collecting distributing
 994                                 // port in an active aggregator is enabled
 995                                 if (port->aggregator &&
 996                                     port->aggregator->is_active &&
 997                                     !__port_is_enabled(port)) {
 998
 999                                         __enable_port(port);
1000                                 }
1001                         }
1002                         break;
1003                 default:    //to silence the compiler
1004                         break;
1005                 }
1006         }
1007
1008         // check if the state machine was changed
1009         if (port->sm_mux_state != last_state) {
1010                 dprintk("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
1011                 switch (port->sm_mux_state) {
1012                 case AD_MUX_DETACHED:
1013                         __detach_bond_from_agg(port);
1014                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1015                         ad_disable_collecting_distributing(port);
1016                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1017                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1018                         port->ntt = 1;
1019                         break;
1020                 case AD_MUX_WAITING:
1021                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1022                         break;
1023                 case AD_MUX_ATTACHED:
1024                         __attach_bond_to_agg(port);
1025                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1026                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1027                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1028                         ad_disable_collecting_distributing(port);
1029                         port->ntt = 1;
1030                         break;
1031                 case AD_MUX_COLLECTING_DISTRIBUTING:
1032                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1033                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1034                         ad_enable_collecting_distributing(port);
1035                         port->ntt = 1;
1036                         break;
1037                 default:    //to silence the compiler
1038                         break;
1039                 }
1040         }
1041 }
1042
1043 /**
1044  * ad_rx_machine - handle a port's rx State Machine
1045  * @lacpdu: the lacpdu we've received
1046  * @port: the port we're looking at
1047  *
1048  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1049  * CURRENT. If timer expired set the state machine in the proper state.
1050  * In other cases, this function checks if we need to switch to other state.
1051  */
1052 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1053 {
1054         rx_states_t last_state;
1055
1056         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1057         __get_rx_machine_lock(port);
1058
1059         // keep current State Machine state to compare later if it was changed
1060         last_state = port->sm_rx_state;
1061
1062         // check if state machine should change state
1063         // first, check if port was reinitialized
1064         if (port->sm_vars & AD_PORT_BEGIN) {
1065                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1066         }
1067         // check if port is not enabled
1068         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1069                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1070         }
1071         // check if new lacpdu arrived
1072         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1073                 port->sm_rx_timer_counter = 0; // zero timer
1074                 port->sm_rx_state = AD_RX_CURRENT;
1075         } else {
1076                 // if timer is on, and if it is expired
1077                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1078                         switch (port->sm_rx_state) {
1079                         case AD_RX_EXPIRED:
1080                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1081                                 break;
1082                         case AD_RX_CURRENT:
1083                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1084                                 break;
1085                         default:    //to silence the compiler
1086                                 break;
1087                         }
1088                 } else {
1089                         // if no lacpdu arrived and no timer is on
1090                         switch (port->sm_rx_state) {
1091                         case AD_RX_PORT_DISABLED:
1092                                 if (port->sm_vars & AD_PORT_MOVED) {
1093                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1094                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1095                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1096                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1097                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1098                                 }
1099                                 break;
1100                         default:    //to silence the compiler
1101                                 break;
1102
1103                         }
1104                 }
1105         }
1106
1107         // check if the State machine was changed or new lacpdu arrived
1108         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1109                 dprintk("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_rx_state);
1110                 switch (port->sm_rx_state) {
1111                 case AD_RX_INITIALIZE:
1112                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1113                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1114                         } else {
1115                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1116                         }
1117                         port->sm_vars &= ~AD_PORT_SELECTED;
1118                         __record_default(port);
1119                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1120                         port->sm_vars &= ~AD_PORT_MOVED;
1121                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1122
1123                         /*- Fall Through -*/
1124
1125                 case AD_RX_PORT_DISABLED:
1126                         port->sm_vars &= ~AD_PORT_MATCHED;
1127                         break;
1128                 case AD_RX_LACP_DISABLED:
1129                         port->sm_vars &= ~AD_PORT_SELECTED;
1130                         __record_default(port);
1131                         port->partner_oper_port_state &= ~AD_STATE_AGGREGATION;
1132                         port->sm_vars |= AD_PORT_MATCHED;
1133                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1134                         break;
1135                 case AD_RX_EXPIRED:
1136                         //Reset of the Synchronization flag. (Standard 43.4.12)
1137                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1138                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1139                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1140                         port->sm_vars &= ~AD_PORT_MATCHED;
1141                         port->partner_oper_port_state |= AD_SHORT_TIMEOUT;
1142                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1143                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1144                         break;
1145                 case AD_RX_DEFAULTED:
1146                         __update_default_selected(port);
1147                         __record_default(port);
1148                         port->sm_vars |= AD_PORT_MATCHED;
1149                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1150                         break;
1151                 case AD_RX_CURRENT:
1152                         // detect loopback situation
1153                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1154                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1155                                 printk(KERN_ERR DRV_NAME ": %s: An illegal loopback occurred on "
1156                                        "adapter (%s). Check the configuration to verify that all "
1157                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1158                                        port->slave->dev->master->name, port->slave->dev->name);
1159                                 __release_rx_machine_lock(port);
1160                                 return;
1161                         }
1162                         __update_selected(lacpdu, port);
1163                         __update_ntt(lacpdu, port);
1164                         __record_pdu(lacpdu, port);
1165                         __choose_matched(lacpdu, port);
1166                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1167                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1168                         // verify that if the aggregator is enabled, the port is enabled too.
1169                         //(because if the link goes down for a short time, the 802.3ad will not
1170                         // catch it, and the port will continue to be disabled)
1171                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1172                                 __enable_port(port);
1173                         }
1174                         break;
1175                 default:    //to silence the compiler
1176                         break;
1177                 }
1178         }
1179         __release_rx_machine_lock(port);
1180 }
1181
1182 /**
1183  * ad_tx_machine - handle a port's tx state machine
1184  * @port: the port we're looking at
1185  *
1186  */
1187 static void ad_tx_machine(struct port *port)
1188 {
1189         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1190         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1191                 // check if there is something to send
1192                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1193                         __update_lacpdu_from_port(port);
1194                         // send the lacpdu
1195                         if (ad_lacpdu_send(port) >= 0) {
1196                                 dprintk("Sent LACPDU on port %d\n", port->actor_port_number);
1197                                 // mark ntt as false, so it will not be sent again until demanded
1198                                 port->ntt = 0;
1199                         }
1200                 }
1201                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1202                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1203         }
1204 }
1205
1206 /**
1207  * ad_periodic_machine - handle a port's periodic state machine
1208  * @port: the port we're looking at
1209  *
1210  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1211  */
1212 static void ad_periodic_machine(struct port *port)
1213 {
1214         periodic_states_t last_state;
1215
1216         // keep current state machine state to compare later if it was changed
1217         last_state = port->sm_periodic_state;
1218
1219         // check if port was reinitialized
1220         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1221             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper_port_state & AD_STATE_LACP_ACTIVITY))
1222            ) {
1223                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1224         }
1225         // check if state machine should change state
1226         else if (port->sm_periodic_timer_counter) {
1227                 // check if periodic state machine expired
1228                 if (!(--port->sm_periodic_timer_counter)) {
1229                         // if expired then do tx
1230                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1231                 } else {
1232                         // If not expired, check if there is some new timeout parameter from the partner state
1233                         switch (port->sm_periodic_state) {
1234                         case AD_FAST_PERIODIC:
1235                                 if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1236                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1237                                 }
1238                                 break;
1239                         case AD_SLOW_PERIODIC:
1240                                 if ((port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1241                                         // stop current timer
1242                                         port->sm_periodic_timer_counter = 0;
1243                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1244                                 }
1245                                 break;
1246                         default:    //to silence the compiler
1247                                 break;
1248                         }
1249                 }
1250         } else {
1251                 switch (port->sm_periodic_state) {
1252                 case AD_NO_PERIODIC:
1253                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1254                         break;
1255                 case AD_PERIODIC_TX:
1256                         if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1257                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1258                         } else {
1259                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1260                         }
1261                         break;
1262                 default:    //to silence the compiler
1263                         break;
1264                 }
1265         }
1266
1267         // check if the state machine was changed
1268         if (port->sm_periodic_state != last_state) {
1269                 dprintk("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1270                 switch (port->sm_periodic_state) {
1271                 case AD_NO_PERIODIC:
1272                         port->sm_periodic_timer_counter = 0;       // zero timer
1273                         break;
1274                 case AD_FAST_PERIODIC:
1275                         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
1276                         break;
1277                 case AD_SLOW_PERIODIC:
1278                         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
1279                         break;
1280                 case AD_PERIODIC_TX:
1281                         port->ntt = 1;
1282                         break;
1283                 default:    //to silence the compiler
1284                         break;
1285                 }
1286         }
1287 }
1288
1289 /**
1290  * ad_port_selection_logic - select aggregation groups
1291  * @port: the port we're looking at
1292  *
1293  * Select aggregation groups, and assign each port for it's aggregetor. The
1294  * selection logic is called in the inititalization (after all the handshkes),
1295  * and after every lacpdu receive (if selected is off).
1296  */
1297 static void ad_port_selection_logic(struct port *port)
1298 {
1299         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1300         struct port *last_port = NULL, *curr_port;
1301         int found = 0;
1302
1303         // if the port is already Selected, do nothing
1304         if (port->sm_vars & AD_PORT_SELECTED) {
1305                 return;
1306         }
1307
1308         // if the port is connected to other aggregator, detach it
1309         if (port->aggregator) {
1310                 // detach the port from its former aggregator
1311                 temp_aggregator=port->aggregator;
1312                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1313                         if (curr_port == port) {
1314                                 temp_aggregator->num_of_ports--;
1315                                 if (!last_port) {// if it is the first port attached to the aggregator
1316                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1317                                 } else {// not the first port attached to the aggregator
1318                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1319                                 }
1320
1321                                 // clear the port's relations to this aggregator
1322                                 port->aggregator = NULL;
1323                                 port->next_port_in_aggregator=NULL;
1324                                 port->actor_port_aggregator_identifier=0;
1325
1326                                 dprintk("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1327                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1328                                 if (!temp_aggregator->lag_ports) {
1329                                         ad_clear_agg(temp_aggregator);
1330                                 }
1331                                 break;
1332                         }
1333                 }
1334                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1335                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Port %d (on %s) was "
1336                                "related to aggregator %d but was not on its port list\n",
1337                                port->slave->dev->master->name,
1338                                port->actor_port_number, port->slave->dev->name,
1339                                port->aggregator->aggregator_identifier);
1340                 }
1341         }
1342         // search on all aggregators for a suitable aggregator for this port
1343         for (aggregator = __get_first_agg(port); aggregator;
1344              aggregator = __get_next_agg(aggregator)) {
1345
1346                 // keep a free aggregator for later use(if needed)
1347                 if (!aggregator->lag_ports) {
1348                         if (!free_aggregator) {
1349                                 free_aggregator=aggregator;
1350                         }
1351                         continue;
1352                 }
1353                 // check if current aggregator suits us
1354                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1355                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper_system)) &&
1356                      (aggregator->partner_system_priority == port->partner_oper_system_priority) &&
1357                      (aggregator->partner_oper_aggregator_key == port->partner_oper_key)
1358                     ) &&
1359                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper_system), &(null_mac_addr)) && // partner answers
1360                       !aggregator->is_individual)  // but is not individual OR
1361                     )
1362                    ) {
1363                         // attach to the founded aggregator
1364                         port->aggregator = aggregator;
1365                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1366                         port->next_port_in_aggregator=aggregator->lag_ports;
1367                         port->aggregator->num_of_ports++;
1368                         aggregator->lag_ports=port;
1369                         dprintk("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1370
1371                         // mark this port as selected
1372                         port->sm_vars |= AD_PORT_SELECTED;
1373                         found = 1;
1374                         break;
1375                 }
1376         }
1377
1378         // the port couldn't find an aggregator - attach it to a new aggregator
1379         if (!found) {
1380                 if (free_aggregator) {
1381                         // assign port a new aggregator
1382                         port->aggregator = free_aggregator;
1383                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1384
1385                         // update the new aggregator's parameters
1386                         // if port was responsed from the end-user
1387                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1388                                 port->aggregator->is_individual = 0;
1389                         } else {
1390                                 port->aggregator->is_individual = 1;
1391                         }
1392
1393                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1394                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1395                         port->aggregator->partner_system=port->partner_oper_system;
1396                         port->aggregator->partner_system_priority = port->partner_oper_system_priority;
1397                         port->aggregator->partner_oper_aggregator_key = port->partner_oper_key;
1398                         port->aggregator->receive_state = 1;
1399                         port->aggregator->transmit_state = 1;
1400                         port->aggregator->lag_ports = port;
1401                         port->aggregator->num_of_ports++;
1402
1403                         // mark this port as selected
1404                         port->sm_vars |= AD_PORT_SELECTED;
1405
1406                         dprintk("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1407                 } else {
1408                         printk(KERN_ERR DRV_NAME ": %s: Port %d (on %s) did not find a suitable aggregator\n",
1409                                port->slave->dev->master->name,
1410                                port->actor_port_number, port->slave->dev->name);
1411                 }
1412         }
1413         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1414         // else set ready=FALSE in all aggregator's ports
1415         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1416
1417         if (!__check_agg_selection_timer(port) && (aggregator = __get_first_agg(port))) {
1418                 ad_agg_selection_logic(aggregator);
1419         }
1420 }
1421
1422 /**
1423  * ad_agg_selection_logic - select an aggregation group for a team
1424  * @aggregator: the aggregator we're looking at
1425  *
1426  * It is assumed that only one aggregator may be selected for a team.
1427  * The logic of this function is to select (at first time) the aggregator with
1428  * the most ports attached to it, and to reselect the active aggregator only if
1429  * the previous aggregator has no more ports related to it.
1430  *
1431  * FIXME: this function MUST be called with the first agg in the bond, or
1432  * __get_active_agg() won't work correctly. This function should be better
1433  * called with the bond itself, and retrieve the first agg from it.
1434  */
1435 static void ad_agg_selection_logic(struct aggregator *aggregator)
1436 {
1437         struct aggregator *best_aggregator = NULL, *active_aggregator = NULL;
1438         struct aggregator *last_active_aggregator = NULL, *origin_aggregator;
1439         struct port *port;
1440         u16 num_of_aggs=0;
1441
1442         origin_aggregator = aggregator;
1443
1444         //get current active aggregator
1445         last_active_aggregator = __get_active_agg(aggregator);
1446
1447         // search for the aggregator with the most ports attached to it.
1448         do {
1449                 // count how many candidate lag's we have
1450                 if (aggregator->lag_ports) {
1451                         num_of_aggs++;
1452                 }
1453                 if (aggregator->is_active && !aggregator->is_individual &&   // if current aggregator is the active aggregator
1454                     MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr))) {   // and partner answers to 802.3ad PDUs
1455                         if (aggregator->num_of_ports) { // if any ports attached to the current aggregator
1456                                 best_aggregator=NULL;    // disregard the best aggregator that was chosen by now
1457                                 break;           // stop the selection of other aggregator if there are any ports attached to this active aggregator
1458                         } else { // no ports attached to this active aggregator
1459                                 aggregator->is_active = 0; // mark this aggregator as not active anymore
1460                         }
1461                 }
1462                 if (aggregator->num_of_ports) { // if any ports attached
1463                         if (best_aggregator) {  // if there is a candidte aggregator
1464                                 //The reasons for choosing new best aggregator:
1465                                 // 1. if current agg is NOT individual and the best agg chosen so far is individual OR
1466                                 // current and best aggs are both individual or both not individual, AND
1467                                 // 2a.  current agg partner reply but best agg partner do not reply OR
1468                                 // 2b.  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply AND
1469                                 //      current has more ports/bandwidth, or same amount of ports but current has faster ports, THEN
1470                                 //      current agg become best agg so far
1471
1472                                 //if current agg is NOT individual and the best agg chosen so far is individual change best_aggregator
1473                                 if (!aggregator->is_individual && best_aggregator->is_individual) {
1474                                         best_aggregator=aggregator;
1475                                 }
1476                                 // current and best aggs are both individual or both not individual
1477                                 else if ((aggregator->is_individual && best_aggregator->is_individual) ||
1478                                          (!aggregator->is_individual && !best_aggregator->is_individual)) {
1479                                         //  current and best aggs are both individual or both not individual AND
1480                                         //  current agg partner reply but best agg partner do not reply
1481                                         if ((MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1482                                              !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1483                                                 best_aggregator=aggregator;
1484                                         }
1485                                         //  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply
1486                                         else if (! (!MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1487                                                     MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1488                                                 if ((__get_agg_selection_mode(aggregator->lag_ports) == AD_BANDWIDTH)&&
1489                                                     (__get_agg_bandwidth(aggregator) > __get_agg_bandwidth(best_aggregator))) {
1490                                                         best_aggregator=aggregator;
1491                                                 } else if (__get_agg_selection_mode(aggregator->lag_ports) == AD_COUNT) {
1492                                                         if (((aggregator->num_of_ports > best_aggregator->num_of_ports) &&
1493                                                              (aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS))||
1494                                                             ((aggregator->num_of_ports == best_aggregator->num_of_ports) &&
1495                                                              ((u16)(aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS) >
1496                                                               (u16)(best_aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS)))) {
1497                                                                 best_aggregator=aggregator;
1498                                                         }
1499                                                 }
1500                                         }
1501                                 }
1502                         } else {
1503                                 best_aggregator=aggregator;
1504                         }
1505                 }
1506                 aggregator->is_active = 0; // mark all aggregators as not active anymore
1507         } while ((aggregator = __get_next_agg(aggregator)));
1508
1509         // if we have new aggregator selected, don't replace the old aggregator if it has an answering partner,
1510         // or if both old aggregator and new aggregator don't have answering partner
1511         if (best_aggregator) {
1512                 if (last_active_aggregator && last_active_aggregator->lag_ports && last_active_aggregator->lag_ports->is_enabled &&
1513                     (MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) ||   // partner answers OR
1514                      (!MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) &&      // both old and new
1515                       !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr))))     // partner do not answer
1516                    ) {
1517                         // if new aggregator has link, and old aggregator does not, replace old aggregator.(do nothing)
1518                         // -> don't replace otherwise.
1519                         if (!(!last_active_aggregator->actor_oper_aggregator_key && best_aggregator->actor_oper_aggregator_key)) {
1520                                 best_aggregator=NULL;
1521                                 last_active_aggregator->is_active = 1; // don't replace good old aggregator
1522
1523                         }
1524                 }
1525         }
1526
1527         // if there is new best aggregator, activate it
1528         if (best_aggregator) {
1529                 for (aggregator = __get_first_agg(best_aggregator->lag_ports);
1530                     aggregator;
1531                     aggregator = __get_next_agg(aggregator)) {
1532
1533                         dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1534                                         aggregator->aggregator_identifier, aggregator->num_of_ports,
1535                                         aggregator->actor_oper_aggregator_key, aggregator->partner_oper_aggregator_key,
1536                                         aggregator->is_individual, aggregator->is_active);
1537                 }
1538
1539                 // check if any partner replys
1540                 if (best_aggregator->is_individual) {
1541                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad response from "
1542                                "the link partner for any adapters in the bond\n",
1543                                best_aggregator->slave->dev->master->name);
1544                 }
1545
1546                 // check if there are more than one aggregator
1547                 if (num_of_aggs > 1) {
1548                         dprintk("Warning: More than one Link Aggregation Group was "
1549                                 "found in the bond. Only one group will function in the bond\n");
1550                 }
1551
1552                 best_aggregator->is_active = 1;
1553                 dprintk("LAG %d choosed as the active LAG\n", best_aggregator->aggregator_identifier);
1554                 dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1555                                 best_aggregator->aggregator_identifier, best_aggregator->num_of_ports,
1556                                 best_aggregator->actor_oper_aggregator_key, best_aggregator->partner_oper_aggregator_key,
1557                                 best_aggregator->is_individual, best_aggregator->is_active);
1558
1559                 // disable the ports that were related to the former active_aggregator
1560                 if (last_active_aggregator) {
1561                         for (port=last_active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1562                                 __disable_port(port);
1563                         }
1564                 }
1565         }
1566
1567         // if the selected aggregator is of join individuals(partner_system is NULL), enable their ports
1568         active_aggregator = __get_active_agg(origin_aggregator);
1569
1570         if (active_aggregator) {
1571                 if (!MAC_ADDRESS_COMPARE(&(active_aggregator->partner_system), &(null_mac_addr))) {
1572                         for (port=active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1573                                 __enable_port(port);
1574                         }
1575                 }
1576         }
1577 }
1578
1579 /**
1580  * ad_clear_agg - clear a given aggregator's parameters
1581  * @aggregator: the aggregator we're looking at
1582  *
1583  */
1584 static void ad_clear_agg(struct aggregator *aggregator)
1585 {
1586         if (aggregator) {
1587                 aggregator->is_individual = 0;
1588                 aggregator->actor_admin_aggregator_key = 0;
1589                 aggregator->actor_oper_aggregator_key = 0;
1590                 aggregator->partner_system = null_mac_addr;
1591                 aggregator->partner_system_priority = 0;
1592                 aggregator->partner_oper_aggregator_key = 0;
1593                 aggregator->receive_state = 0;
1594                 aggregator->transmit_state = 0;
1595                 aggregator->lag_ports = NULL;
1596                 aggregator->is_active = 0;
1597                 aggregator->num_of_ports = 0;
1598                 dprintk("LAG %d was cleared\n", aggregator->aggregator_identifier);
1599         }
1600 }
1601
1602 /**
1603  * ad_initialize_agg - initialize a given aggregator's parameters
1604  * @aggregator: the aggregator we're looking at
1605  *
1606  */
1607 static void ad_initialize_agg(struct aggregator *aggregator)
1608 {
1609         if (aggregator) {
1610                 ad_clear_agg(aggregator);
1611
1612                 aggregator->aggregator_mac_address = null_mac_addr;
1613                 aggregator->aggregator_identifier = 0;
1614                 aggregator->slave = NULL;
1615         }
1616 }
1617
1618 /**
1619  * ad_initialize_port - initialize a given port's parameters
1620  * @aggregator: the aggregator we're looking at
1621  * @lacp_fast: boolean. whether fast periodic should be used
1622  *
1623  */
1624 static void ad_initialize_port(struct port *port, int lacp_fast)
1625 {
1626         if (port) {
1627                 port->actor_port_number = 1;
1628                 port->actor_port_priority = 0xff;
1629                 port->actor_system = null_mac_addr;
1630                 port->actor_system_priority = 0xffff;
1631                 port->actor_port_aggregator_identifier = 0;
1632                 port->ntt = 0;
1633                 port->actor_admin_port_key = 1;
1634                 port->actor_oper_port_key  = 1;
1635                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1636                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1637
1638                 if (lacp_fast) {
1639                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1640                 }
1641
1642                 port->partner_admin_system = null_mac_addr;
1643                 port->partner_oper_system  = null_mac_addr;
1644                 port->partner_admin_system_priority = 0xffff;
1645                 port->partner_oper_system_priority  = 0xffff;
1646                 port->partner_admin_key = 1;
1647                 port->partner_oper_key  = 1;
1648                 port->partner_admin_port_number = 1;
1649                 port->partner_oper_port_number  = 1;
1650                 port->partner_admin_port_priority = 0xff;
1651                 port->partner_oper_port_priority  = 0xff;
1652                 port->partner_admin_port_state = 1;
1653                 port->partner_oper_port_state  = 1;
1654                 port->is_enabled = 1;
1655                 // ****** private parameters ******
1656                 port->sm_vars = 0x3;
1657                 port->sm_rx_state = 0;
1658                 port->sm_rx_timer_counter = 0;
1659                 port->sm_periodic_state = 0;
1660                 port->sm_periodic_timer_counter = 0;
1661                 port->sm_mux_state = 0;
1662                 port->sm_mux_timer_counter = 0;
1663                 port->sm_tx_state = 0;
1664                 port->sm_tx_timer_counter = 0;
1665                 port->slave = NULL;
1666                 port->aggregator = NULL;
1667                 port->next_port_in_aggregator = NULL;
1668                 port->transaction_id = 0;
1669
1670                 ad_initialize_lacpdu(&(port->lacpdu));
1671         }
1672 }
1673
1674 /**
1675  * ad_enable_collecting_distributing - enable a port's transmit/receive
1676  * @port: the port we're looking at
1677  *
1678  * Enable @port if it's in an active aggregator
1679  */
1680 static void ad_enable_collecting_distributing(struct port *port)
1681 {
1682         if (port->aggregator->is_active) {
1683                 dprintk("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1684                 __enable_port(port);
1685         }
1686 }
1687
1688 /**
1689  * ad_disable_collecting_distributing - disable a port's transmit/receive
1690  * @port: the port we're looking at
1691  *
1692  */
1693 static void ad_disable_collecting_distributing(struct port *port)
1694 {
1695         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1696                 dprintk("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1697                 __disable_port(port);
1698         }
1699 }
1700
1701 #if 0
1702 /**
1703  * ad_marker_info_send - send a marker information frame
1704  * @port: the port we're looking at
1705  *
1706  * This function does nothing since we decided not to implement send and handle
1707  * response for marker PDU's, in this stage, but only to respond to marker
1708  * information.
1709  */
1710 static void ad_marker_info_send(struct port *port)
1711 {
1712         struct bond_marker marker;
1713         u16 index;
1714
1715         // fill the marker PDU with the appropriate values
1716         marker.subtype = 0x02;
1717         marker.version_number = 0x01;
1718         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1719         marker.marker_length = 0x16;
1720         // convert requester_port to Big Endian
1721         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1722         marker.requester_system = port->actor_system;
1723         // convert requester_port(u32) to Big Endian
1724         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1725         marker.pad = 0;
1726         marker.tlv_type_terminator = 0x00;
1727         marker.terminator_length = 0x00;
1728         for (index=0; index<90; index++) {
1729                 marker.reserved_90[index]=0;
1730         }
1731
1732         // send the marker information
1733         if (ad_marker_send(port, &marker) >= 0) {
1734                 dprintk("Sent Marker Information on port %d\n", port->actor_port_number);
1735         }
1736 }
1737 #endif
1738
1739 /**
1740  * ad_marker_info_received - handle receive of a Marker information frame
1741  * @marker_info: Marker info received
1742  * @port: the port we're looking at
1743  *
1744  */
1745 static void ad_marker_info_received(struct bond_marker *marker_info,
1746         struct port *port)
1747 {
1748         struct bond_marker marker;
1749
1750         // copy the received marker data to the response marker
1751         //marker = *marker_info;
1752         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1753         // change the marker subtype to marker response
1754         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1755         // send the marker response
1756
1757         if (ad_marker_send(port, &marker) >= 0) {
1758                 dprintk("Sent Marker Response on port %d\n", port->actor_port_number);
1759         }
1760 }
1761
1762 /**
1763  * ad_marker_response_received - handle receive of a marker response frame
1764  * @marker: marker PDU received
1765  * @port: the port we're looking at
1766  *
1767  * This function does nothing since we decided not to implement send and handle
1768  * response for marker PDU's, in this stage, but only to respond to marker
1769  * information.
1770  */
1771 static void ad_marker_response_received(struct bond_marker *marker,
1772         struct port *port)
1773 {
1774         marker=NULL; // just to satisfy the compiler
1775         port=NULL;  // just to satisfy the compiler
1776         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1777 }
1778
1779 /**
1780  * ad_initialize_lacpdu - initialize a given lacpdu structure
1781  * @lacpdu: lacpdu structure to initialize
1782  *
1783  */
1784 static void ad_initialize_lacpdu(struct lacpdu *lacpdu)
1785 {
1786         u16 index;
1787
1788         // initialize lacpdu data
1789         lacpdu->subtype = 0x01;
1790         lacpdu->version_number = 0x01;
1791         lacpdu->tlv_type_actor_info = 0x01;
1792         lacpdu->actor_information_length = 0x14;
1793         // lacpdu->actor_system_priority    updated on send
1794         // lacpdu->actor_system             updated on send
1795         // lacpdu->actor_key                updated on send
1796         // lacpdu->actor_port_priority      updated on send
1797         // lacpdu->actor_port               updated on send
1798         // lacpdu->actor_state              updated on send
1799         lacpdu->tlv_type_partner_info = 0x02;
1800         lacpdu->partner_information_length = 0x14;
1801         for (index=0; index<=2; index++) {
1802                 lacpdu->reserved_3_1[index]=0;
1803         }
1804         // lacpdu->partner_system_priority  updated on send
1805         // lacpdu->partner_system           updated on send
1806         // lacpdu->partner_key              updated on send
1807         // lacpdu->partner_port_priority    updated on send
1808         // lacpdu->partner_port             updated on send
1809         // lacpdu->partner_state            updated on send
1810         for (index=0; index<=2; index++) {
1811                 lacpdu->reserved_3_2[index]=0;
1812         }
1813         lacpdu->tlv_type_collector_info = 0x03;
1814         lacpdu->collector_information_length= 0x10;
1815         lacpdu->collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY);
1816         for (index=0; index<=11; index++) {
1817                 lacpdu->reserved_12[index]=0;
1818         }
1819         lacpdu->tlv_type_terminator = 0x00;
1820         lacpdu->terminator_length = 0;
1821         for (index=0; index<=49; index++) {
1822                 lacpdu->reserved_50[index]=0;
1823         }
1824 }
1825
1826 //////////////////////////////////////////////////////////////////////////////////////
1827 // ================= AD exported functions to the main bonding code ==================
1828 //////////////////////////////////////////////////////////////////////////////////////
1829
1830 // Check aggregators status in team every T seconds
1831 #define AD_AGGREGATOR_SELECTION_TIMER  8
1832
1833 static u16 aggregator_identifier;
1834
1835 /**
1836  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1837  * @bond: bonding struct to work on
1838  * @tick_resolution: tick duration (millisecond resolution)
1839  * @lacp_fast: boolean. whether fast periodic should be used
1840  *
1841  * Can be called only after the mac address of the bond is set.
1842  */
1843 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1844 {
1845         // check that the bond is not initialized yet
1846         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr), &(bond->dev->dev_addr))) {
1847
1848                 aggregator_identifier = 0;
1849
1850                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1851                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1852                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1853
1854                 // initialize how many times this module is called in one second(should be about every 100ms)
1855                 ad_ticks_per_sec = tick_resolution;
1856
1857                 // initialize the aggregator selection timer(to activate an aggregation selection after initialize)
1858                 BOND_AD_INFO(bond).agg_select_timer = (AD_AGGREGATOR_SELECTION_TIMER * ad_ticks_per_sec);
1859                 BOND_AD_INFO(bond).agg_select_mode = AD_BANDWIDTH;
1860         }
1861 }
1862
1863 /**
1864  * bond_3ad_bind_slave - initialize a slave's port
1865  * @slave: slave struct to work on
1866  *
1867  * Returns:   0 on success
1868  *          < 0 on error
1869  */
1870 int bond_3ad_bind_slave(struct slave *slave)
1871 {
1872         struct bonding *bond = bond_get_bond_by_slave(slave);
1873         struct port *port;
1874         struct aggregator *aggregator;
1875
1876         if (bond == NULL) {
1877                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1878                        slave->dev->master->name, slave->dev->name);
1879                 return -1;
1880         }
1881
1882         //check that the slave has not been intialized yet.
1883         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1884
1885                 // port initialization
1886                 port = &(SLAVE_AD_INFO(slave).port);
1887
1888                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1889
1890                 port->slave = slave;
1891                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1892                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1893                 //              ------------------------------------------------------------
1894                 // Port key :   | User key                       |      Speed       |Duplex|
1895                 //              ------------------------------------------------------------
1896                 //              16                               6               1 0
1897                 port->actor_admin_port_key = 0; // initialize this parameter
1898                 port->actor_admin_port_key |= __get_duplex(port);
1899                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1900                 port->actor_oper_port_key = port->actor_admin_port_key;
1901                 // if the port is not full duplex, then the port should be not lacp Enabled
1902                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1903                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1904                 }
1905                 // actor system is the bond's system
1906                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1907                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1908                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1909                 port->aggregator = NULL;
1910                 port->next_port_in_aggregator = NULL;
1911
1912                 __disable_port(port);
1913                 __initialize_port_locks(port);
1914
1915
1916                 // aggregator initialization
1917                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1918
1919                 ad_initialize_agg(aggregator);
1920
1921                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1922                 aggregator->aggregator_identifier = (++aggregator_identifier);
1923                 aggregator->slave = slave;
1924                 aggregator->is_active = 0;
1925                 aggregator->num_of_ports = 0;
1926         }
1927
1928         return 0;
1929 }
1930
1931 /**
1932  * bond_3ad_unbind_slave - deinitialize a slave's port
1933  * @slave: slave struct to work on
1934  *
1935  * Search for the aggregator that is related to this port, remove the
1936  * aggregator and assign another aggregator for other port related to it
1937  * (if any), and remove the port.
1938  */
1939 void bond_3ad_unbind_slave(struct slave *slave)
1940 {
1941         struct port *port, *prev_port, *temp_port;
1942         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1943         int select_new_active_agg = 0;
1944
1945         // find the aggregator related to this slave
1946         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1947
1948         // find the port related to this slave
1949         port = &(SLAVE_AD_INFO(slave).port);
1950
1951         // if slave is null, the whole port is not initialized
1952         if (!port->slave) {
1953                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
1954                        "unbind an uninitialized port on %s\n",
1955                        slave->dev->master->name, slave->dev->name);
1956                 return;
1957         }
1958
1959         dprintk("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1960
1961         /* Tell the partner that this port is not suitable for aggregation */
1962         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1963         __update_lacpdu_from_port(port);
1964         ad_lacpdu_send(port);
1965
1966         // check if this aggregator is occupied
1967         if (aggregator->lag_ports) {
1968                 // check if there are other ports related to this aggregator except
1969                 // the port related to this slave(thats ensure us that there is a
1970                 // reason to search for new aggregator, and that we will find one
1971                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1972                         // find new aggregator for the related port(s)
1973                         new_aggregator = __get_first_agg(port);
1974                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1975                                 // if the new aggregator is empty, or it connected to to our port only
1976                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1977                                         break;
1978                                 }
1979                         }
1980                         // if new aggregator found, copy the aggregator's parameters
1981                         // and connect the related lag_ports to the new aggregator
1982                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1983                                 dprintk("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
1984
1985                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1986                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
1987                                                aggregator->slave->dev->master->name);
1988                                         // select new active aggregator
1989                                          select_new_active_agg = 1;
1990                                 }
1991
1992                                 new_aggregator->is_individual = aggregator->is_individual;
1993                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1994                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1995                                 new_aggregator->partner_system = aggregator->partner_system;
1996                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1997                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1998                                 new_aggregator->receive_state = aggregator->receive_state;
1999                                 new_aggregator->transmit_state = aggregator->transmit_state;
2000                                 new_aggregator->lag_ports = aggregator->lag_ports;
2001                                 new_aggregator->is_active = aggregator->is_active;
2002                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2003
2004                                 // update the information that is written on the ports about the aggregator
2005                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2006                                         temp_port->aggregator=new_aggregator;
2007                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2008                                 }
2009
2010                                 // clear the aggregator
2011                                 ad_clear_agg(aggregator);
2012
2013                                 if (select_new_active_agg) {
2014                                         ad_agg_selection_logic(__get_first_agg(port));
2015                                 }
2016                         } else {
2017                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2018                                        "and could not find a new aggregator for its ports\n",
2019                                        slave->dev->master->name);
2020                         }
2021                 } else { // in case that the only port related to this aggregator is the one we want to remove
2022                         select_new_active_agg = aggregator->is_active;
2023                         // clear the aggregator
2024                         ad_clear_agg(aggregator);
2025                         if (select_new_active_agg) {
2026                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2027                                        slave->dev->master->name);
2028                                 // select new active aggregator
2029                                 ad_agg_selection_logic(__get_first_agg(port));
2030                         }
2031                 }
2032         }
2033
2034         dprintk("Unbinding port %d\n", port->actor_port_number);
2035         // find the aggregator that this port is connected to
2036         temp_aggregator = __get_first_agg(port);
2037         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2038                 prev_port = NULL;
2039                 // search the port in the aggregator's related ports
2040                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2041                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2042                                 if (prev_port) {
2043                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2044                                 } else {
2045                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2046                                 }
2047                                 temp_aggregator->num_of_ports--;
2048                                 if (temp_aggregator->num_of_ports==0) {
2049                                         select_new_active_agg = temp_aggregator->is_active;
2050                                         // clear the aggregator
2051                                         ad_clear_agg(temp_aggregator);
2052                                         if (select_new_active_agg) {
2053                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2054                                                        slave->dev->master->name);
2055                                                 // select new active aggregator
2056                                                 ad_agg_selection_logic(__get_first_agg(port));
2057                                         }
2058                                 }
2059                                 break;
2060                         }
2061                 }
2062         }
2063         port->slave=NULL;
2064 }
2065
2066 /**
2067  * bond_3ad_state_machine_handler - handle state machines timeout
2068  * @bond: bonding struct to work on
2069  *
2070  * The state machine handling concept in this module is to check every tick
2071  * which state machine should operate any function. The execution order is
2072  * round robin, so when we have an interaction between state machines, the
2073  * reply of one to each other might be delayed until next tick.
2074  *
2075  * This function also complete the initialization when the agg_select_timer
2076  * times out, and it selects an aggregator for the ports that are yet not
2077  * related to any aggregator, and selects the active aggregator for a bond.
2078  */
2079 void bond_3ad_state_machine_handler(struct work_struct *work)
2080 {
2081         struct bonding *bond = container_of(work, struct bonding,
2082                                             ad_work.work);
2083         struct port *port;
2084         struct aggregator *aggregator;
2085
2086         read_lock(&bond->lock);
2087
2088         if (bond->kill_timers) {
2089                 goto out;
2090         }
2091
2092         //check if there are any slaves
2093         if (bond->slave_cnt == 0) {
2094                 goto re_arm;
2095         }
2096
2097         // check if agg_select_timer timer after initialize is timed out
2098         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2099                 // select the active aggregator for the bond
2100                 if ((port = __get_first_port(bond))) {
2101                         if (!port->slave) {
2102                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2103                                        "uninitialized\n", bond->dev->name);
2104                                 goto re_arm;
2105                         }
2106
2107                         aggregator = __get_first_agg(port);
2108                         ad_agg_selection_logic(aggregator);
2109                 }
2110         }
2111
2112         // for each port run the state machines
2113         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2114                 if (!port->slave) {
2115                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2116                                "port\n", bond->dev->name);
2117                         goto re_arm;
2118                 }
2119
2120                 ad_rx_machine(NULL, port);
2121                 ad_periodic_machine(port);
2122                 ad_port_selection_logic(port);
2123                 ad_mux_machine(port);
2124                 ad_tx_machine(port);
2125
2126                 // turn off the BEGIN bit, since we already handled it
2127                 if (port->sm_vars & AD_PORT_BEGIN) {
2128                         port->sm_vars &= ~AD_PORT_BEGIN;
2129                 }
2130         }
2131
2132 re_arm:
2133         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2134 out:
2135         read_unlock(&bond->lock);
2136 }
2137
2138 /**
2139  * bond_3ad_rx_indication - handle a received frame
2140  * @lacpdu: received lacpdu
2141  * @slave: slave struct to work on
2142  * @length: length of the data received
2143  *
2144  * It is assumed that frames that were sent on this NIC don't returned as new
2145  * received frames (loopback). Since only the payload is given to this
2146  * function, it check for loopback.
2147  */
2148 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2149 {
2150         struct port *port;
2151
2152         if (length >= sizeof(struct lacpdu)) {
2153
2154                 port = &(SLAVE_AD_INFO(slave).port);
2155
2156                 if (!port->slave) {
2157                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2158                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2159                         return;
2160                 }
2161
2162                 switch (lacpdu->subtype) {
2163                 case AD_TYPE_LACPDU:
2164                         dprintk("Received LACPDU on port %d\n", port->actor_port_number);
2165                         ad_rx_machine(lacpdu, port);
2166                         break;
2167
2168                 case AD_TYPE_MARKER:
2169                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2170
2171                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2172                         case AD_MARKER_INFORMATION_SUBTYPE:
2173                                 dprintk("Received Marker Information on port %d\n", port->actor_port_number);
2174                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2175                                 break;
2176
2177                         case AD_MARKER_RESPONSE_SUBTYPE:
2178                                 dprintk("Received Marker Response on port %d\n", port->actor_port_number);
2179                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2180                                 break;
2181
2182                         default:
2183                                 dprintk("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2184                         }
2185                 }
2186         }
2187 }
2188
2189 /**
2190  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2191  * @slave: slave struct to work on
2192  *
2193  * Handle reselection of aggregator (if needed) for this port.
2194  */
2195 void bond_3ad_adapter_speed_changed(struct slave *slave)
2196 {
2197         struct port *port;
2198
2199         port = &(SLAVE_AD_INFO(slave).port);
2200
2201         // if slave is null, the whole port is not initialized
2202         if (!port->slave) {
2203                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2204                        "changed for uninitialized port on %s\n",
2205                        slave->dev->master->name, slave->dev->name);
2206                 return;
2207         }
2208
2209         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2210         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2211         dprintk("Port %d changed speed\n", port->actor_port_number);
2212         // there is no need to reselect a new aggregator, just signal the
2213         // state machines to reinitialize
2214         port->sm_vars |= AD_PORT_BEGIN;
2215 }
2216
2217 /**
2218  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2219  * @slave: slave struct to work on
2220  *
2221  * Handle reselection of aggregator (if needed) for this port.
2222  */
2223 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2224 {
2225         struct port *port;
2226
2227         port=&(SLAVE_AD_INFO(slave).port);
2228
2229         // if slave is null, the whole port is not initialized
2230         if (!port->slave) {
2231                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2232                        "for uninitialized port on %s\n",
2233                        slave->dev->master->name, slave->dev->name);
2234                 return;
2235         }
2236
2237         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2238         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2239         dprintk("Port %d changed duplex\n", port->actor_port_number);
2240         // there is no need to reselect a new aggregator, just signal the
2241         // state machines to reinitialize
2242         port->sm_vars |= AD_PORT_BEGIN;
2243 }
2244
2245 /**
2246  * bond_3ad_handle_link_change - handle a slave's link status change indication
2247  * @slave: slave struct to work on
2248  * @status: whether the link is now up or down
2249  *
2250  * Handle reselection of aggregator (if needed) for this port.
2251  */
2252 void bond_3ad_handle_link_change(struct slave *slave, char link)
2253 {
2254         struct port *port;
2255
2256         port = &(SLAVE_AD_INFO(slave).port);
2257
2258         // if slave is null, the whole port is not initialized
2259         if (!port->slave) {
2260                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2261                        "uninitialized port on %s\n",
2262                         slave->dev->master->name, slave->dev->name);
2263                 return;
2264         }
2265
2266         // 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)
2267         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2268         if (link == BOND_LINK_UP) {
2269                 port->is_enabled = 1;
2270                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2271                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2272                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2273                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2274         } else {
2275                 /* link has failed */
2276                 port->is_enabled = 0;
2277                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2278                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2279         }
2280         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2281         // there is no need to reselect a new aggregator, just signal the
2282         // state machines to reinitialize
2283         port->sm_vars |= AD_PORT_BEGIN;
2284 }
2285
2286 /*
2287  * set link state for bonding master: if we have an active
2288  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2289  * have an active aggregator if there are no slaves with link up.
2290  *
2291  * This behavior complies with IEEE 802.3 section 43.3.9.
2292  *
2293  * Called by bond_set_carrier(). Return zero if carrier state does not
2294  * change, nonzero if it does.
2295  */
2296 int bond_3ad_set_carrier(struct bonding *bond)
2297 {
2298         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2299                 if (!netif_carrier_ok(bond->dev)) {
2300                         netif_carrier_on(bond->dev);
2301                         return 1;
2302                 }
2303                 return 0;
2304         }
2305
2306         if (netif_carrier_ok(bond->dev)) {
2307                 netif_carrier_off(bond->dev);
2308                 return 1;
2309         }
2310         return 0;
2311 }
2312
2313 /**
2314  * bond_3ad_get_active_agg_info - get information of the active aggregator
2315  * @bond: bonding struct to work on
2316  * @ad_info: ad_info struct to fill with the bond's info
2317  *
2318  * Returns:   0 on success
2319  *          < 0 on error
2320  */
2321 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2322 {
2323         struct aggregator *aggregator = NULL;
2324         struct port *port;
2325
2326         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2327                 if (port->aggregator && port->aggregator->is_active) {
2328                         aggregator = port->aggregator;
2329                         break;
2330                 }
2331         }
2332
2333         if (aggregator) {
2334                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2335                 ad_info->ports = aggregator->num_of_ports;
2336                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2337                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2338                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2339                 return 0;
2340         }
2341
2342         return -1;
2343 }
2344
2345 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2346 {
2347         struct slave *slave, *start_at;
2348         struct bonding *bond = dev->priv;
2349         int slave_agg_no;
2350         int slaves_in_agg;
2351         int agg_id;
2352         int i;
2353         struct ad_info ad_info;
2354         int res = 1;
2355
2356         /* make sure that the slaves list will
2357          * not change during tx
2358          */
2359         read_lock(&bond->lock);
2360
2361         if (!BOND_IS_OK(bond)) {
2362                 goto out;
2363         }
2364
2365         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2366                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2367                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2368                 goto out;
2369         }
2370
2371         slaves_in_agg = ad_info.ports;
2372         agg_id = ad_info.aggregator_id;
2373
2374         if (slaves_in_agg == 0) {
2375                 /*the aggregator is empty*/
2376                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2377                        "aggregator is empty\n",
2378                        dev->name);
2379                 goto out;
2380         }
2381
2382         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2383
2384         bond_for_each_slave(bond, slave, i) {
2385                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2386
2387                 if (agg && (agg->aggregator_identifier == agg_id)) {
2388                         slave_agg_no--;
2389                         if (slave_agg_no < 0) {
2390                                 break;
2391                         }
2392                 }
2393         }
2394
2395         if (slave_agg_no >= 0) {
2396                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2397                        "for aggregator ID %d\n", dev->name, agg_id);
2398                 goto out;
2399         }
2400
2401         start_at = slave;
2402
2403         bond_for_each_slave_from(bond, slave, i, start_at) {
2404                 int slave_agg_id = 0;
2405                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2406
2407                 if (agg) {
2408                         slave_agg_id = agg->aggregator_identifier;
2409                 }
2410
2411                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2412                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2413                         break;
2414                 }
2415         }
2416
2417 out:
2418         if (res) {
2419                 /* no suitable interface, frame not sent */
2420                 dev_kfree_skb(skb);
2421         }
2422         read_unlock(&bond->lock);
2423         return 0;
2424 }
2425
2426 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2427 {
2428         struct bonding *bond = dev->priv;
2429         struct slave *slave = NULL;
2430         int ret = NET_RX_DROP;
2431
2432         if (dev_net(dev) != &init_net)
2433                 goto out;
2434
2435         if (!(dev->flags & IFF_MASTER))
2436                 goto out;
2437
2438         read_lock(&bond->lock);
2439         slave = bond_get_slave_by_dev((struct bonding *)dev->priv, orig_dev);
2440         if (!slave)
2441                 goto out_unlock;
2442
2443         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2444
2445         ret = NET_RX_SUCCESS;
2446
2447 out_unlock:
2448         read_unlock(&bond->lock);
2449 out:
2450         dev_kfree_skb(skb);
2451
2452         return ret;
2453 }
2454