drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 //#define BONDING_DEBUG 1
  24
  25 #include <linux/skbuff.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/if_bonding.h>
  31 #include <linux/pkt_sched.h>
  32 #include "bonding.h"
  33 #include "bond_3ad.h"
  34
  35 // General definitions
  36 #define AD_SHORT_TIMEOUT           1
  37 #define AD_LONG_TIMEOUT            0
  38 #define AD_STANDBY                 0x2
  39 #define AD_MAX_TX_IN_SECOND        3
  40 #define AD_COLLECTOR_MAX_DELAY     0
  41
  42 // Timer definitions(43.4.4 in the 802.3ad standard)
  43 #define AD_FAST_PERIODIC_TIME      1
  44 #define AD_SLOW_PERIODIC_TIME      30
  45 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  46 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  47 #define AD_CHURN_DETECTION_TIME    60
  48 #define AD_AGGREGATE_WAIT_TIME     2
  49
  50 // Port state definitions(43.4.2.2 in the 802.3ad standard)
  51 #define AD_STATE_LACP_ACTIVITY   0x1
  52 #define AD_STATE_LACP_TIMEOUT    0x2
  53 #define AD_STATE_AGGREGATION     0x4
  54 #define AD_STATE_SYNCHRONIZATION 0x8
  55 #define AD_STATE_COLLECTING      0x10
  56 #define AD_STATE_DISTRIBUTING    0x20
  57 #define AD_STATE_DEFAULTED       0x40
  58 #define AD_STATE_EXPIRED         0x80
  59
  60 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
  61 #define AD_PORT_BEGIN           0x1
  62 #define AD_PORT_LACP_ENABLED    0x2
  63 #define AD_PORT_ACTOR_CHURN     0x4
  64 #define AD_PORT_PARTNER_CHURN   0x8
  65 #define AD_PORT_READY           0x10
  66 #define AD_PORT_READY_N         0x20
  67 #define AD_PORT_MATCHED         0x40
  68 #define AD_PORT_STANDBY         0x80
  69 #define AD_PORT_SELECTED        0x100
  70 #define AD_PORT_MOVED           0x200
  71
  72 // Port Key definitions
  73 // key is determined according to the link speed, duplex and
  74 // user key(which is yet not supported)
  75 //              ------------------------------------------------------------
  76 // Port key :   | User key                       |      Speed       |Duplex|
  77 //              ------------------------------------------------------------
  78 //              16                               6               1 0
  79 #define  AD_DUPLEX_KEY_BITS    0x1
  80 #define  AD_SPEED_KEY_BITS     0x3E
  81 #define  AD_USER_KEY_BITS      0xFFC0
  82
  83 //dalloun
  84 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  85 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  86 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  87 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  88 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  89 //endalloun
  90
  91 // compare MAC addresses
  92 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  93
  94 static struct mac_addr null_mac_addr = {{0, 0, 0, 0, 0, 0}};
  95 static u16 ad_ticks_per_sec;
  96 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  97
  98 // ================= 3AD api to bonding and kernel code ==================
  99 static u16 __get_link_speed(struct port *port);
 100 static u8 __get_duplex(struct port *port);
 101 static inline void __initialize_port_locks(struct port *port);
 102 //conversions
 103 static void __htons_lacpdu(struct lacpdu *lacpdu);
 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 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 marker *marker_info, struct port *port);
 143 static void ad_marker_response_received(struct 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(&(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(&(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  * __htons_lacpdu - convert the contents of a LACPDU to network byte order
 424  * @lacpdu: the speicifed lacpdu
 425  *
 426  * For each multi-byte field in the lacpdu, convert its content
 427  */
 428 static void __htons_lacpdu(struct lacpdu *lacpdu)
 429 {
 430         if (lacpdu) {
 431                 lacpdu->actor_system_priority =   htons(lacpdu->actor_system_priority);
 432                 lacpdu->actor_key =               htons(lacpdu->actor_key);
 433                 lacpdu->actor_port_priority =     htons(lacpdu->actor_port_priority);
 434                 lacpdu->actor_port =              htons(lacpdu->actor_port);
 435                 lacpdu->partner_system_priority = htons(lacpdu->partner_system_priority);
 436                 lacpdu->partner_key =             htons(lacpdu->partner_key);
 437                 lacpdu->partner_port_priority =   htons(lacpdu->partner_port_priority);
 438                 lacpdu->partner_port =            htons(lacpdu->partner_port);
 439                 lacpdu->collector_max_delay =     htons(lacpdu->collector_max_delay);
 440         }
 441 }
 442
 443 /**
 444  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 445  * @timer_type: which timer to operate
 446  * @par: timer parameter. see below
 447  *
 448  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 449  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 450  *                                                  %SLOW_PERIODIC_TIME.
 451  */
 452 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 453 {
 454         u16 retval=0;    //to silence the compiler
 455
 456         switch (timer_type) {
 457         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 458                 if (par) {            // for short or long timeout
 459                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 460                 } else {
 461                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 462                 }
 463                 break;
 464         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 465                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 466                 break;
 467         case AD_PERIODIC_TIMER:     // for periodic machine
 468                 retval = (par*ad_ticks_per_sec); // long timeout
 469                 break;
 470         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 471                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 472                 break;
 473         case AD_WAIT_WHILE_TIMER:           // for selection machine
 474                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 475                 break;
 476         }
 477         return retval;
 478 }
 479
 480
 481 /////////////////////////////////////////////////////////////////////////////////
 482 // ================= ad_rx_machine helper functions ==================
 483 /////////////////////////////////////////////////////////////////////////////////
 484
 485 /**
 486  * __record_pdu - record parameters from a received lacpdu
 487  * @lacpdu: the lacpdu we've received
 488  * @port: the port we're looking at
 489  *
 490  * Record the parameter values for the Actor carried in a received lacpdu as
 491  * the current partner operational parameter values and sets
 492  * actor_oper_port_state.defaulted to FALSE.
 493  */
 494 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 495 {
 496         // validate lacpdu and port
 497         if (lacpdu && port) {
 498                 // record the new parameter values for the partner operational
 499                 port->partner_oper_port_number = ntohs(lacpdu->actor_port);
 500                 port->partner_oper_port_priority = ntohs(lacpdu->actor_port_priority);
 501                 port->partner_oper_system = lacpdu->actor_system;
 502                 port->partner_oper_system_priority = ntohs(lacpdu->actor_system_priority);
 503                 port->partner_oper_key = ntohs(lacpdu->actor_key);
 504                 // zero partener's lase states
 505                 port->partner_oper_port_state = 0;
 506                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_ACTIVITY);
 507                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_TIMEOUT);
 508                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_AGGREGATION);
 509                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION);
 510                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_COLLECTING);
 511                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DISTRIBUTING);
 512                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DEFAULTED);
 513                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_EXPIRED);
 514
 515                 // set actor_oper_port_state.defaulted to FALSE
 516                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 517
 518                 // set the partner sync. to on if the partner is sync. and the port is matched
 519                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 520                         port->partner_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 521                 } else {
 522                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 523                 }
 524         }
 525 }
 526
 527 /**
 528  * __record_default - record default parameters
 529  * @port: the port we're looking at
 530  *
 531  * This function records the default parameter values for the partner carried
 532  * in the Partner Admin parameters as the current partner operational parameter
 533  * values and sets actor_oper_port_state.defaulted to TRUE.
 534  */
 535 static void __record_default(struct port *port)
 536 {
 537         // validate the port
 538         if (port) {
 539                 // record the partner admin parameters
 540                 port->partner_oper_port_number = port->partner_admin_port_number;
 541                 port->partner_oper_port_priority = port->partner_admin_port_priority;
 542                 port->partner_oper_system = port->partner_admin_system;
 543                 port->partner_oper_system_priority = port->partner_admin_system_priority;
 544                 port->partner_oper_key = port->partner_admin_key;
 545                 port->partner_oper_port_state = port->partner_admin_port_state;
 546
 547                 // set actor_oper_port_state.defaulted to true
 548                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 549         }
 550 }
 551
 552 /**
 553  * __update_selected - update a port's Selected variable from a received lacpdu
 554  * @lacpdu: the lacpdu we've received
 555  * @port: the port we're looking at
 556  *
 557  * Update the value of the selected variable, using parameter values from a
 558  * newly received lacpdu. The parameter values for the Actor carried in the
 559  * received PDU are compared with the corresponding operational parameter
 560  * values for the ports partner. If one or more of the comparisons shows that
 561  * the value(s) received in the PDU differ from the current operational values,
 562  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 563  * set to out_of_sync. Otherwise, selected remains unchanged.
 564  */
 565 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 566 {
 567         // validate lacpdu and port
 568         if (lacpdu && port) {
 569                 // check if any parameter is different
 570                 if ((ntohs(lacpdu->actor_port) != port->partner_oper_port_number) ||
 571                     (ntohs(lacpdu->actor_port_priority) != port->partner_oper_port_priority) ||
 572                     MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->partner_oper_system)) ||
 573                     (ntohs(lacpdu->actor_system_priority) != port->partner_oper_system_priority) ||
 574                     (ntohs(lacpdu->actor_key) != port->partner_oper_key) ||
 575                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
 576                    ) {
 577                         // update the state machine Selected variable
 578                         port->sm_vars &= ~AD_PORT_SELECTED;
 579                 }
 580         }
 581 }
 582
 583 /**
 584  * __update_default_selected - update a port's Selected variable from Partner
 585  * @port: the port we're looking at
 586  *
 587  * This function updates the value of the selected variable, using the partner
 588  * administrative parameter values. The administrative values are compared with
 589  * the corresponding operational parameter values for the partner. If one or
 590  * more of the comparisons shows that the administrative value(s) differ from
 591  * the current operational values, then Selected is set to FALSE and
 592  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 593  * Selected remains unchanged.
 594  */
 595 static void __update_default_selected(struct port *port)
 596 {
 597         // validate the port
 598         if (port) {
 599                 // check if any parameter is different
 600                 if ((port->partner_admin_port_number != port->partner_oper_port_number) ||
 601                     (port->partner_admin_port_priority != port->partner_oper_port_priority) ||
 602                     MAC_ADDRESS_COMPARE(&(port->partner_admin_system), &(port->partner_oper_system)) ||
 603                     (port->partner_admin_system_priority != port->partner_oper_system_priority) ||
 604                     (port->partner_admin_key != port->partner_oper_key) ||
 605                     ((port->partner_admin_port_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
 606                    ) {
 607                         // update the state machine Selected variable
 608                         port->sm_vars &= ~AD_PORT_SELECTED;
 609                 }
 610         }
 611 }
 612
 613 /**
 614  * __choose_matched - update a port's matched variable from a received lacpdu
 615  * @lacpdu: the lacpdu we've received
 616  * @port: the port we're looking at
 617  *
 618  * Update the value of the matched variable, using parameter values from a
 619  * newly received lacpdu. Parameter values for the partner carried in the
 620  * received PDU are compared with the corresponding operational parameter
 621  * values for the actor. Matched is set to TRUE if all of these parameters
 622  * match and the PDU parameter partner_state.aggregation has the same value as
 623  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 624  * in the aggregation. Matched is also set to TRUE if the value of
 625  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 626  * an individual link and lacp will actively maintain the link. Otherwise,
 627  * matched is set to FALSE. LACP is considered to be actively maintaining the
 628  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 629  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 630  * partner_state.lacp_activity variables are TRUE.
 631  */
 632 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 633 {
 634         // validate lacpdu and port
 635         if (lacpdu && port) {
 636                 // check if all parameters are alike
 637                 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 638                      (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 639                      !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 640                      (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 641                      (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 642                      ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 643                     // or this is individual link(aggregation == FALSE)
 644                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 645                    ) {
 646                         // update the state machine Matched variable
 647                         port->sm_vars |= AD_PORT_MATCHED;
 648                 } else {
 649                         port->sm_vars &= ~AD_PORT_MATCHED;
 650                 }
 651         }
 652 }
 653
 654 /**
 655  * __update_ntt - update a port's ntt variable from a received lacpdu
 656  * @lacpdu: the lacpdu we've received
 657  * @port: the port we're looking at
 658  *
 659  * Updates the value of the ntt variable, using parameter values from a newly
 660  * received lacpdu. The parameter values for the partner carried in the
 661  * received PDU are compared with the corresponding operational parameter
 662  * values for the Actor. If one or more of the comparisons shows that the
 663  * value(s) received in the PDU differ from the current operational values,
 664  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 665  */
 666 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 667 {
 668         // validate lacpdu and port
 669         if (lacpdu && port) {
 670                 // check if any parameter is different
 671                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 672                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 673                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 674                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 675                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 676                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 677                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 678                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 679                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 680                    ) {
 681                         // set ntt to be TRUE
 682                         port->ntt = 1;
 683                 }
 684         }
 685 }
 686
 687 /**
 688  * __attach_bond_to_agg
 689  * @port: the port we're looking at
 690  *
 691  * Handle the attaching of the port's control parser/multiplexer and the
 692  * aggregator. This function does nothing since the parser/multiplexer of the
 693  * receive and the parser/multiplexer of the aggregator are already combined.
 694  */
 695 static void __attach_bond_to_agg(struct port *port)
 696 {
 697         port=NULL; // just to satisfy the compiler
 698         // This function does nothing since the parser/multiplexer of the receive
 699         // and the parser/multiplexer of the aggregator are already combined
 700 }
 701
 702 /**
 703  * __detach_bond_from_agg
 704  * @port: the port we're looking at
 705  *
 706  * Handle the detaching of the port's control parser/multiplexer from the
 707  * aggregator. This function does nothing since the parser/multiplexer of the
 708  * receive and the parser/multiplexer of the aggregator are already combined.
 709  */
 710 static void __detach_bond_from_agg(struct port *port)
 711 {
 712         port=NULL; // just to satisfy the compiler
 713         // This function does nothing sience the parser/multiplexer of the receive
 714         // and the parser/multiplexer of the aggregator are already combined
 715 }
 716
 717 /**
 718  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 719  * @aggregator: the aggregator we're looking at
 720  *
 721  */
 722 static int __agg_ports_are_ready(struct aggregator *aggregator)
 723 {
 724         struct port *port;
 725         int retval = 1;
 726
 727         if (aggregator) {
 728                 // scan all ports in this aggregator to verfy if they are all ready
 729                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 730                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 731                                 retval = 0;
 732                                 break;
 733                         }
 734                 }
 735         }
 736
 737         return retval;
 738 }
 739
 740 /**
 741  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 742  * @aggregator: the aggregator we're looking at
 743  * @val: Should the ports' ready bit be set on or off
 744  *
 745  */
 746 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 747 {
 748         struct port *port;
 749
 750         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 751                 if (val) {
 752                         port->sm_vars |= AD_PORT_READY;
 753                 } else {
 754                         port->sm_vars &= ~AD_PORT_READY;
 755                 }
 756         }
 757 }
 758
 759 /**
 760  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 761  * @aggregator: the aggregator we're looking at
 762  *
 763  */
 764 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 765 {
 766         u32 bandwidth=0;
 767         u32 basic_speed;
 768
 769         if (aggregator->num_of_ports) {
 770                 basic_speed = __get_link_speed(aggregator->lag_ports);
 771                 switch (basic_speed) {
 772                 case AD_LINK_SPEED_BITMASK_1MBPS:
 773                         bandwidth = aggregator->num_of_ports;
 774                         break;
 775                 case AD_LINK_SPEED_BITMASK_10MBPS:
 776                         bandwidth = aggregator->num_of_ports * 10;
 777                         break;
 778                 case AD_LINK_SPEED_BITMASK_100MBPS:
 779                         bandwidth = aggregator->num_of_ports * 100;
 780                         break;
 781                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 782                         bandwidth = aggregator->num_of_ports * 1000;
 783                         break;
 784                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 785                         bandwidth = aggregator->num_of_ports * 10000;
 786                         break;
 787                 default:
 788                         bandwidth=0; // to silent the compilor ....
 789                 }
 790         }
 791         return bandwidth;
 792 }
 793
 794 /**
 795  * __get_active_agg - get the current active aggregator
 796  * @aggregator: the aggregator we're looking at
 797  *
 798  */
 799 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 800 {
 801         struct aggregator *retval = NULL;
 802
 803         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 804                 if (aggregator->is_active) {
 805                         retval = aggregator;
 806                         break;
 807                 }
 808         }
 809
 810         return retval;
 811 }
 812
 813 /**
 814  * __update_lacpdu_from_port - update a port's lacpdu fields
 815  * @port: the port we're looking at
 816  *
 817  */
 818 static inline void __update_lacpdu_from_port(struct port *port)
 819 {
 820         struct lacpdu *lacpdu = &port->lacpdu;
 821
 822         /* update current actual Actor parameters */
 823         /* lacpdu->subtype                   initialized
 824          * lacpdu->version_number            initialized
 825          * lacpdu->tlv_type_actor_info       initialized
 826          * lacpdu->actor_information_length  initialized
 827          */
 828
 829         lacpdu->actor_system_priority = port->actor_system_priority;
 830         lacpdu->actor_system = port->actor_system;
 831         lacpdu->actor_key = port->actor_oper_port_key;
 832         lacpdu->actor_port_priority = port->actor_port_priority;
 833         lacpdu->actor_port = port->actor_port_number;
 834         lacpdu->actor_state = port->actor_oper_port_state;
 835
 836         /* lacpdu->reserved_3_1              initialized
 837          * lacpdu->tlv_type_partner_info     initialized
 838          * lacpdu->partner_information_length initialized
 839          */
 840
 841         lacpdu->partner_system_priority = port->partner_oper_system_priority;
 842         lacpdu->partner_system = port->partner_oper_system;
 843         lacpdu->partner_key = port->partner_oper_key;
 844         lacpdu->partner_port_priority = port->partner_oper_port_priority;
 845         lacpdu->partner_port = port->partner_oper_port_number;
 846         lacpdu->partner_state = port->partner_oper_port_state;
 847
 848         /* lacpdu->reserved_3_2              initialized
 849          * lacpdu->tlv_type_collector_info   initialized
 850          * lacpdu->collector_information_length initialized
 851          * collector_max_delay                initialized
 852          * reserved_12[12]                   initialized
 853          * tlv_type_terminator               initialized
 854          * terminator_length                 initialized
 855          * reserved_50[50]                   initialized
 856          */
 857
 858         /* Convert all non u8 parameters to Big Endian for transmit */
 859         __htons_lacpdu(lacpdu);
 860 }
 861
 862 //////////////////////////////////////////////////////////////////////////////////////
 863 // ================= main 802.3ad protocol code ======================================
 864 //////////////////////////////////////////////////////////////////////////////////////
 865
 866 /**
 867  * ad_lacpdu_send - send out a lacpdu packet on a given port
 868  * @port: the port we're looking at
 869  *
 870  * Returns:   0 on success
 871  *          < 0 on error
 872  */
 873 static int ad_lacpdu_send(struct port *port)
 874 {
 875         struct slave *slave = port->slave;
 876         struct sk_buff *skb;
 877         struct lacpdu_header *lacpdu_header;
 878         int length = sizeof(struct lacpdu_header);
 879         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 880
 881         skb = dev_alloc_skb(length);
 882         if (!skb) {
 883                 return -ENOMEM;
 884         }
 885
 886         skb->dev = slave->dev;
 887         skb_reset_mac_header(skb);
 888         skb->network_header = skb->mac_header + ETH_HLEN;
 889         skb->protocol = PKT_TYPE_LACPDU;
 890         skb->priority = TC_PRIO_CONTROL;
 891
 892         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 893
 894         lacpdu_header->ad_header.destination_address = lacpdu_multicast_address;
 895         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 896            to identify loopback lacpdus in receive. */
 897         lacpdu_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 898         lacpdu_header->ad_header.length_type = PKT_TYPE_LACPDU;
 899
 900         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 901
 902         dev_queue_xmit(skb);
 903
 904         return 0;
 905 }
 906
 907 /**
 908  * ad_marker_send - send marker information/response on a given port
 909  * @port: the port we're looking at
 910  * @marker: marker data to send
 911  *
 912  * Returns:   0 on success
 913  *          < 0 on error
 914  */
 915 static int ad_marker_send(struct port *port, struct marker *marker)
 916 {
 917         struct slave *slave = port->slave;
 918         struct sk_buff *skb;
 919         struct marker_header *marker_header;
 920         int length = sizeof(struct marker_header);
 921         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
 922
 923         skb = dev_alloc_skb(length + 16);
 924         if (!skb) {
 925                 return -ENOMEM;
 926         }
 927
 928         skb_reserve(skb, 16);
 929
 930         skb->dev = slave->dev;
 931         skb_reset_mac_header(skb);
 932         skb->network_header = skb->mac_header + ETH_HLEN;
 933         skb->protocol = PKT_TYPE_LACPDU;
 934
 935         marker_header = (struct marker_header *)skb_put(skb, length);
 936
 937         marker_header->ad_header.destination_address = lacpdu_multicast_address;
 938         /* Note: source addres is set to be the member's PERMANENT address, because we use it
 939            to identify loopback MARKERs in receive. */
 940         marker_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
 941         marker_header->ad_header.length_type = PKT_TYPE_LACPDU;
 942
 943         marker_header->marker = *marker; // struct copy
 944
 945         dev_queue_xmit(skb);
 946
 947         return 0;
 948 }
 949
 950 /**
 951  * ad_mux_machine - handle a port's mux state machine
 952  * @port: the port we're looking at
 953  *
 954  */
 955 static void ad_mux_machine(struct port *port)
 956 {
 957         mux_states_t last_state;
 958
 959         // keep current State Machine state to compare later if it was changed
 960         last_state = port->sm_mux_state;
 961
 962         if (port->sm_vars & AD_PORT_BEGIN) {
 963                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 964         } else {
 965                 switch (port->sm_mux_state) {
 966                 case AD_MUX_DETACHED:
 967                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
 968                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 969                         }
 970                         break;
 971                 case AD_MUX_WAITING:
 972                         // if SELECTED == FALSE return to DETACH state
 973                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 974                                 port->sm_vars &= ~AD_PORT_READY_N;
 975                                 // in order to withhold the Selection Logic to check all ports READY_N value
 976                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 977                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 978                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 979                                 break;
 980                         }
 981
 982                         // check if the wait_while_timer expired
 983                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
 984                                 port->sm_vars |= AD_PORT_READY_N;
 985                         }
 986
 987                         // in order to withhold the selection logic to check all ports READY_N value
 988                         // every callback cycle to update ready variable, we check READY_N and update READY here
 989                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 990
 991                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 992                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
 993                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 994                         }
 995                         break;
 996                 case AD_MUX_ATTACHED:
 997                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 998                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 999                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
1000                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
1001                                 port->sm_vars &= ~AD_PORT_READY_N;
1002                                 // in order to withhold the selection logic to check all ports READY_N value
1003                                 // every callback cycle to update ready variable, we check READY_N and update READY here
1004                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1005                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
1006                         }
1007                         break;
1008                 case AD_MUX_COLLECTING_DISTRIBUTING:
1009                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
1010                             !(port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION)
1011                            ) {
1012                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
1013
1014                         } else {
1015                                 // if port state hasn't changed make
1016                                 // sure that a collecting distributing
1017                                 // port in an active aggregator is enabled
1018                                 if (port->aggregator &&
1019                                     port->aggregator->is_active &&
1020                                     !__port_is_enabled(port)) {
1021
1022                                         __enable_port(port);
1023                                 }
1024                         }
1025                         break;
1026                 default:    //to silence the compiler
1027                         break;
1028                 }
1029         }
1030
1031         // check if the state machine was changed
1032         if (port->sm_mux_state != last_state) {
1033                 dprintk("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
1034                 switch (port->sm_mux_state) {
1035                 case AD_MUX_DETACHED:
1036                         __detach_bond_from_agg(port);
1037                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1038                         ad_disable_collecting_distributing(port);
1039                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1040                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1041                         port->ntt = 1;
1042                         break;
1043                 case AD_MUX_WAITING:
1044                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1045                         break;
1046                 case AD_MUX_ATTACHED:
1047                         __attach_bond_to_agg(port);
1048                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1049                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1050                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1051                         ad_disable_collecting_distributing(port);
1052                         port->ntt = 1;
1053                         break;
1054                 case AD_MUX_COLLECTING_DISTRIBUTING:
1055                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1056                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1057                         ad_enable_collecting_distributing(port);
1058                         port->ntt = 1;
1059                         break;
1060                 default:    //to silence the compiler
1061                         break;
1062                 }
1063         }
1064 }
1065
1066 /**
1067  * ad_rx_machine - handle a port's rx State Machine
1068  * @lacpdu: the lacpdu we've received
1069  * @port: the port we're looking at
1070  *
1071  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1072  * CURRENT. If timer expired set the state machine in the proper state.
1073  * In other cases, this function checks if we need to switch to other state.
1074  */
1075 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1076 {
1077         rx_states_t last_state;
1078
1079         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1080         __get_rx_machine_lock(port);
1081
1082         // keep current State Machine state to compare later if it was changed
1083         last_state = port->sm_rx_state;
1084
1085         // check if state machine should change state
1086         // first, check if port was reinitialized
1087         if (port->sm_vars & AD_PORT_BEGIN) {
1088                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1089         }
1090         // check if port is not enabled
1091         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1092                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1093         }
1094         // check if new lacpdu arrived
1095         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1096                 port->sm_rx_timer_counter = 0; // zero timer
1097                 port->sm_rx_state = AD_RX_CURRENT;
1098         } else {
1099                 // if timer is on, and if it is expired
1100                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1101                         switch (port->sm_rx_state) {
1102                         case AD_RX_EXPIRED:
1103                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1104                                 break;
1105                         case AD_RX_CURRENT:
1106                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1107                                 break;
1108                         default:    //to silence the compiler
1109                                 break;
1110                         }
1111                 } else {
1112                         // if no lacpdu arrived and no timer is on
1113                         switch (port->sm_rx_state) {
1114                         case AD_RX_PORT_DISABLED:
1115                                 if (port->sm_vars & AD_PORT_MOVED) {
1116                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1117                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1118                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1119                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1120                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1121                                 }
1122                                 break;
1123                         default:    //to silence the compiler
1124                                 break;
1125
1126                         }
1127                 }
1128         }
1129
1130         // check if the State machine was changed or new lacpdu arrived
1131         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1132                 dprintk("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_rx_state);
1133                 switch (port->sm_rx_state) {
1134                 case AD_RX_INITIALIZE:
1135                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1136                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1137                         } else {
1138                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1139                         }
1140                         port->sm_vars &= ~AD_PORT_SELECTED;
1141                         __record_default(port);
1142                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1143                         port->sm_vars &= ~AD_PORT_MOVED;
1144                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1145
1146                         /*- Fall Through -*/
1147
1148                 case AD_RX_PORT_DISABLED:
1149                         port->sm_vars &= ~AD_PORT_MATCHED;
1150                         break;
1151                 case AD_RX_LACP_DISABLED:
1152                         port->sm_vars &= ~AD_PORT_SELECTED;
1153                         __record_default(port);
1154                         port->partner_oper_port_state &= ~AD_STATE_AGGREGATION;
1155                         port->sm_vars |= AD_PORT_MATCHED;
1156                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1157                         break;
1158                 case AD_RX_EXPIRED:
1159                         //Reset of the Synchronization flag. (Standard 43.4.12)
1160                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1161                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1162                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1163                         port->sm_vars &= ~AD_PORT_MATCHED;
1164                         port->partner_oper_port_state |= AD_SHORT_TIMEOUT;
1165                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1166                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1167                         break;
1168                 case AD_RX_DEFAULTED:
1169                         __update_default_selected(port);
1170                         __record_default(port);
1171                         port->sm_vars |= AD_PORT_MATCHED;
1172                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1173                         break;
1174                 case AD_RX_CURRENT:
1175                         // detect loopback situation
1176                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1177                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1178                                 printk(KERN_ERR DRV_NAME ": %s: An illegal loopback occurred on "
1179                                        "adapter (%s). Check the configuration to verify that all "
1180                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1181                                        port->slave->dev->master->name, port->slave->dev->name);
1182                                 __release_rx_machine_lock(port);
1183                                 return;
1184                         }
1185                         __update_selected(lacpdu, port);
1186                         __update_ntt(lacpdu, port);
1187                         __record_pdu(lacpdu, port);
1188                         __choose_matched(lacpdu, port);
1189                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1190                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1191                         // verify that if the aggregator is enabled, the port is enabled too.
1192                         //(because if the link goes down for a short time, the 802.3ad will not
1193                         // catch it, and the port will continue to be disabled)
1194                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1195                                 __enable_port(port);
1196                         }
1197                         break;
1198                 default:    //to silence the compiler
1199                         break;
1200                 }
1201         }
1202         __release_rx_machine_lock(port);
1203 }
1204
1205 /**
1206  * ad_tx_machine - handle a port's tx state machine
1207  * @port: the port we're looking at
1208  *
1209  */
1210 static void ad_tx_machine(struct port *port)
1211 {
1212         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1213         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1214                 // check if there is something to send
1215                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1216                         __update_lacpdu_from_port(port);
1217                         // send the lacpdu
1218                         if (ad_lacpdu_send(port) >= 0) {
1219                                 dprintk("Sent LACPDU on port %d\n", port->actor_port_number);
1220                                 // mark ntt as false, so it will not be sent again until demanded
1221                                 port->ntt = 0;
1222                         }
1223                 }
1224                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1225                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1226         }
1227 }
1228
1229 /**
1230  * ad_periodic_machine - handle a port's periodic state machine
1231  * @port: the port we're looking at
1232  *
1233  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1234  */
1235 static void ad_periodic_machine(struct port *port)
1236 {
1237         periodic_states_t last_state;
1238
1239         // keep current state machine state to compare later if it was changed
1240         last_state = port->sm_periodic_state;
1241
1242         // check if port was reinitialized
1243         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1244             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper_port_state & AD_STATE_LACP_ACTIVITY))
1245            ) {
1246                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1247         }
1248         // check if state machine should change state
1249         else if (port->sm_periodic_timer_counter) {
1250                 // check if periodic state machine expired
1251                 if (!(--port->sm_periodic_timer_counter)) {
1252                         // if expired then do tx
1253                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1254                 } else {
1255                         // If not expired, check if there is some new timeout parameter from the partner state
1256                         switch (port->sm_periodic_state) {
1257                         case AD_FAST_PERIODIC:
1258                                 if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1259                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1260                                 }
1261                                 break;
1262                         case AD_SLOW_PERIODIC:
1263                                 if ((port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1264                                         // stop current timer
1265                                         port->sm_periodic_timer_counter = 0;
1266                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1267                                 }
1268                                 break;
1269                         default:    //to silence the compiler
1270                                 break;
1271                         }
1272                 }
1273         } else {
1274                 switch (port->sm_periodic_state) {
1275                 case AD_NO_PERIODIC:
1276                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1277                         break;
1278                 case AD_PERIODIC_TX:
1279                         if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1280                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1281                         } else {
1282                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1283                         }
1284                         break;
1285                 default:    //to silence the compiler
1286                         break;
1287                 }
1288         }
1289
1290         // check if the state machine was changed
1291         if (port->sm_periodic_state != last_state) {
1292                 dprintk("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1293                 switch (port->sm_periodic_state) {
1294                 case AD_NO_PERIODIC:
1295                         port->sm_periodic_timer_counter = 0;       // zero timer
1296                         break;
1297                 case AD_FAST_PERIODIC:
1298                         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
1299                         break;
1300                 case AD_SLOW_PERIODIC:
1301                         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
1302                         break;
1303                 case AD_PERIODIC_TX:
1304                         port->ntt = 1;
1305                         break;
1306                 default:    //to silence the compiler
1307                         break;
1308                 }
1309         }
1310 }
1311
1312 /**
1313  * ad_port_selection_logic - select aggregation groups
1314  * @port: the port we're looking at
1315  *
1316  * Select aggregation groups, and assign each port for it's aggregetor. The
1317  * selection logic is called in the inititalization (after all the handshkes),
1318  * and after every lacpdu receive (if selected is off).
1319  */
1320 static void ad_port_selection_logic(struct port *port)
1321 {
1322         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1323         struct port *last_port = NULL, *curr_port;
1324         int found = 0;
1325
1326         // if the port is already Selected, do nothing
1327         if (port->sm_vars & AD_PORT_SELECTED) {
1328                 return;
1329         }
1330
1331         // if the port is connected to other aggregator, detach it
1332         if (port->aggregator) {
1333                 // detach the port from its former aggregator
1334                 temp_aggregator=port->aggregator;
1335                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1336                         if (curr_port == port) {
1337                                 temp_aggregator->num_of_ports--;
1338                                 if (!last_port) {// if it is the first port attached to the aggregator
1339                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1340                                 } else {// not the first port attached to the aggregator
1341                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1342                                 }
1343
1344                                 // clear the port's relations to this aggregator
1345                                 port->aggregator = NULL;
1346                                 port->next_port_in_aggregator=NULL;
1347                                 port->actor_port_aggregator_identifier=0;
1348
1349                                 dprintk("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1350                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1351                                 if (!temp_aggregator->lag_ports) {
1352                                         ad_clear_agg(temp_aggregator);
1353                                 }
1354                                 break;
1355                         }
1356                 }
1357                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1358                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Port %d (on %s) was "
1359                                "related to aggregator %d but was not on its port list\n",
1360                                port->slave->dev->master->name,
1361                                port->actor_port_number, port->slave->dev->name,
1362                                port->aggregator->aggregator_identifier);
1363                 }
1364         }
1365         // search on all aggregators for a suitable aggregator for this port
1366         for (aggregator = __get_first_agg(port); aggregator;
1367              aggregator = __get_next_agg(aggregator)) {
1368
1369                 // keep a free aggregator for later use(if needed)
1370                 if (!aggregator->lag_ports) {
1371                         if (!free_aggregator) {
1372                                 free_aggregator=aggregator;
1373                         }
1374                         continue;
1375                 }
1376                 // check if current aggregator suits us
1377                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1378                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper_system)) &&
1379                      (aggregator->partner_system_priority == port->partner_oper_system_priority) &&
1380                      (aggregator->partner_oper_aggregator_key == port->partner_oper_key)
1381                     ) &&
1382                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper_system), &(null_mac_addr)) && // partner answers
1383                       !aggregator->is_individual)  // but is not individual OR
1384                     )
1385                    ) {
1386                         // attach to the founded aggregator
1387                         port->aggregator = aggregator;
1388                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1389                         port->next_port_in_aggregator=aggregator->lag_ports;
1390                         port->aggregator->num_of_ports++;
1391                         aggregator->lag_ports=port;
1392                         dprintk("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1393
1394                         // mark this port as selected
1395                         port->sm_vars |= AD_PORT_SELECTED;
1396                         found = 1;
1397                         break;
1398                 }
1399         }
1400
1401         // the port couldn't find an aggregator - attach it to a new aggregator
1402         if (!found) {
1403                 if (free_aggregator) {
1404                         // assign port a new aggregator
1405                         port->aggregator = free_aggregator;
1406                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1407
1408                         // update the new aggregator's parameters
1409                         // if port was responsed from the end-user
1410                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1411                                 port->aggregator->is_individual = 0;
1412                         } else {
1413                                 port->aggregator->is_individual = 1;
1414                         }
1415
1416                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1417                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1418                         port->aggregator->partner_system=port->partner_oper_system;
1419                         port->aggregator->partner_system_priority = port->partner_oper_system_priority;
1420                         port->aggregator->partner_oper_aggregator_key = port->partner_oper_key;
1421                         port->aggregator->receive_state = 1;
1422                         port->aggregator->transmit_state = 1;
1423                         port->aggregator->lag_ports = port;
1424                         port->aggregator->num_of_ports++;
1425
1426                         // mark this port as selected
1427                         port->sm_vars |= AD_PORT_SELECTED;
1428
1429                         dprintk("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1430                 } else {
1431                         printk(KERN_ERR DRV_NAME ": %s: Port %d (on %s) did not find a suitable aggregator\n",
1432                                port->slave->dev->master->name,
1433                                port->actor_port_number, port->slave->dev->name);
1434                 }
1435         }
1436         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1437         // else set ready=FALSE in all aggregator's ports
1438         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1439
1440         if (!__check_agg_selection_timer(port) && (aggregator = __get_first_agg(port))) {
1441                 ad_agg_selection_logic(aggregator);
1442         }
1443 }
1444
1445 /**
1446  * ad_agg_selection_logic - select an aggregation group for a team
1447  * @aggregator: the aggregator we're looking at
1448  *
1449  * It is assumed that only one aggregator may be selected for a team.
1450  * The logic of this function is to select (at first time) the aggregator with
1451  * the most ports attached to it, and to reselect the active aggregator only if
1452  * the previous aggregator has no more ports related to it.
1453  *
1454  * FIXME: this function MUST be called with the first agg in the bond, or
1455  * __get_active_agg() won't work correctly. This function should be better
1456  * called with the bond itself, and retrieve the first agg from it.
1457  */
1458 static void ad_agg_selection_logic(struct aggregator *aggregator)
1459 {
1460         struct aggregator *best_aggregator = NULL, *active_aggregator = NULL;
1461         struct aggregator *last_active_aggregator = NULL, *origin_aggregator;
1462         struct port *port;
1463         u16 num_of_aggs=0;
1464
1465         origin_aggregator = aggregator;
1466
1467         //get current active aggregator
1468         last_active_aggregator = __get_active_agg(aggregator);
1469
1470         // search for the aggregator with the most ports attached to it.
1471         do {
1472                 // count how many candidate lag's we have
1473                 if (aggregator->lag_ports) {
1474                         num_of_aggs++;
1475                 }
1476                 if (aggregator->is_active && !aggregator->is_individual &&   // if current aggregator is the active aggregator
1477                     MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr))) {   // and partner answers to 802.3ad PDUs
1478                         if (aggregator->num_of_ports) { // if any ports attached to the current aggregator
1479                                 best_aggregator=NULL;    // disregard the best aggregator that was chosen by now
1480                                 break;           // stop the selection of other aggregator if there are any ports attached to this active aggregator
1481                         } else { // no ports attached to this active aggregator
1482                                 aggregator->is_active = 0; // mark this aggregator as not active anymore
1483                         }
1484                 }
1485                 if (aggregator->num_of_ports) { // if any ports attached
1486                         if (best_aggregator) {  // if there is a candidte aggregator
1487                                 //The reasons for choosing new best aggregator:
1488                                 // 1. if current agg is NOT individual and the best agg chosen so far is individual OR
1489                                 // current and best aggs are both individual or both not individual, AND
1490                                 // 2a.  current agg partner reply but best agg partner do not reply OR
1491                                 // 2b.  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply AND
1492                                 //      current has more ports/bandwidth, or same amount of ports but current has faster ports, THEN
1493                                 //      current agg become best agg so far
1494
1495                                 //if current agg is NOT individual and the best agg chosen so far is individual change best_aggregator
1496                                 if (!aggregator->is_individual && best_aggregator->is_individual) {
1497                                         best_aggregator=aggregator;
1498                                 }
1499                                 // current and best aggs are both individual or both not individual
1500                                 else if ((aggregator->is_individual && best_aggregator->is_individual) ||
1501                                          (!aggregator->is_individual && !best_aggregator->is_individual)) {
1502                                         //  current and best aggs are both individual or both not individual AND
1503                                         //  current agg partner reply but best agg partner do not reply
1504                                         if ((MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1505                                              !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1506                                                 best_aggregator=aggregator;
1507                                         }
1508                                         //  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply
1509                                         else if (! (!MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1510                                                     MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1511                                                 if ((__get_agg_selection_mode(aggregator->lag_ports) == AD_BANDWIDTH)&&
1512                                                     (__get_agg_bandwidth(aggregator) > __get_agg_bandwidth(best_aggregator))) {
1513                                                         best_aggregator=aggregator;
1514                                                 } else if (__get_agg_selection_mode(aggregator->lag_ports) == AD_COUNT) {
1515                                                         if (((aggregator->num_of_ports > best_aggregator->num_of_ports) &&
1516                                                              (aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS))||
1517                                                             ((aggregator->num_of_ports == best_aggregator->num_of_ports) &&
1518                                                              ((u16)(aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS) >
1519                                                               (u16)(best_aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS)))) {
1520                                                                 best_aggregator=aggregator;
1521                                                         }
1522                                                 }
1523                                         }
1524                                 }
1525                         } else {
1526                                 best_aggregator=aggregator;
1527                         }
1528                 }
1529                 aggregator->is_active = 0; // mark all aggregators as not active anymore
1530         } while ((aggregator = __get_next_agg(aggregator)));
1531
1532         // if we have new aggregator selected, don't replace the old aggregator if it has an answering partner,
1533         // or if both old aggregator and new aggregator don't have answering partner
1534         if (best_aggregator) {
1535                 if (last_active_aggregator && last_active_aggregator->lag_ports && last_active_aggregator->lag_ports->is_enabled &&
1536                     (MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) ||   // partner answers OR
1537                      (!MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) &&      // both old and new
1538                       !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr))))     // partner do not answer
1539                    ) {
1540                         // if new aggregator has link, and old aggregator does not, replace old aggregator.(do nothing)
1541                         // -> don't replace otherwise.
1542                         if (!(!last_active_aggregator->actor_oper_aggregator_key && best_aggregator->actor_oper_aggregator_key)) {
1543                                 best_aggregator=NULL;
1544                                 last_active_aggregator->is_active = 1; // don't replace good old aggregator
1545
1546                         }
1547                 }
1548         }
1549
1550         // if there is new best aggregator, activate it
1551         if (best_aggregator) {
1552                 for (aggregator = __get_first_agg(best_aggregator->lag_ports);
1553                     aggregator;
1554                     aggregator = __get_next_agg(aggregator)) {
1555
1556                         dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1557                                         aggregator->aggregator_identifier, aggregator->num_of_ports,
1558                                         aggregator->actor_oper_aggregator_key, aggregator->partner_oper_aggregator_key,
1559                                         aggregator->is_individual, aggregator->is_active);
1560                 }
1561
1562                 // check if any partner replys
1563                 if (best_aggregator->is_individual) {
1564                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad response from "
1565                                "the link partner for any adapters in the bond\n",
1566                                best_aggregator->slave->dev->master->name);
1567                 }
1568
1569                 // check if there are more than one aggregator
1570                 if (num_of_aggs > 1) {
1571                         dprintk("Warning: More than one Link Aggregation Group was "
1572                                 "found in the bond. Only one group will function in the bond\n");
1573                 }
1574
1575                 best_aggregator->is_active = 1;
1576                 dprintk("LAG %d choosed as the active LAG\n", best_aggregator->aggregator_identifier);
1577                 dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1578                                 best_aggregator->aggregator_identifier, best_aggregator->num_of_ports,
1579                                 best_aggregator->actor_oper_aggregator_key, best_aggregator->partner_oper_aggregator_key,
1580                                 best_aggregator->is_individual, best_aggregator->is_active);
1581
1582                 // disable the ports that were related to the former active_aggregator
1583                 if (last_active_aggregator) {
1584                         for (port=last_active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1585                                 __disable_port(port);
1586                         }
1587                 }
1588         }
1589
1590         // if the selected aggregator is of join individuals(partner_system is NULL), enable their ports
1591         active_aggregator = __get_active_agg(origin_aggregator);
1592
1593         if (active_aggregator) {
1594                 if (!MAC_ADDRESS_COMPARE(&(active_aggregator->partner_system), &(null_mac_addr))) {
1595                         for (port=active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1596                                 __enable_port(port);
1597                         }
1598                 }
1599         }
1600 }
1601
1602 /**
1603  * ad_clear_agg - clear a given aggregator's parameters
1604  * @aggregator: the aggregator we're looking at
1605  *
1606  */
1607 static void ad_clear_agg(struct aggregator *aggregator)
1608 {
1609         if (aggregator) {
1610                 aggregator->is_individual = 0;
1611                 aggregator->actor_admin_aggregator_key = 0;
1612                 aggregator->actor_oper_aggregator_key = 0;
1613                 aggregator->partner_system = null_mac_addr;
1614                 aggregator->partner_system_priority = 0;
1615                 aggregator->partner_oper_aggregator_key = 0;
1616                 aggregator->receive_state = 0;
1617                 aggregator->transmit_state = 0;
1618                 aggregator->lag_ports = NULL;
1619                 aggregator->is_active = 0;
1620                 aggregator->num_of_ports = 0;
1621                 dprintk("LAG %d was cleared\n", aggregator->aggregator_identifier);
1622         }
1623 }
1624
1625 /**
1626  * ad_initialize_agg - initialize a given aggregator's parameters
1627  * @aggregator: the aggregator we're looking at
1628  *
1629  */
1630 static void ad_initialize_agg(struct aggregator *aggregator)
1631 {
1632         if (aggregator) {
1633                 ad_clear_agg(aggregator);
1634
1635                 aggregator->aggregator_mac_address = null_mac_addr;
1636                 aggregator->aggregator_identifier = 0;
1637                 aggregator->slave = NULL;
1638         }
1639 }
1640
1641 /**
1642  * ad_initialize_port - initialize a given port's parameters
1643  * @aggregator: the aggregator we're looking at
1644  * @lacp_fast: boolean. whether fast periodic should be used
1645  *
1646  */
1647 static void ad_initialize_port(struct port *port, int lacp_fast)
1648 {
1649         if (port) {
1650                 port->actor_port_number = 1;
1651                 port->actor_port_priority = 0xff;
1652                 port->actor_system = null_mac_addr;
1653                 port->actor_system_priority = 0xffff;
1654                 port->actor_port_aggregator_identifier = 0;
1655                 port->ntt = 0;
1656                 port->actor_admin_port_key = 1;
1657                 port->actor_oper_port_key  = 1;
1658                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1659                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1660
1661                 if (lacp_fast) {
1662                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1663                 }
1664
1665                 port->partner_admin_system = null_mac_addr;
1666                 port->partner_oper_system  = null_mac_addr;
1667                 port->partner_admin_system_priority = 0xffff;
1668                 port->partner_oper_system_priority  = 0xffff;
1669                 port->partner_admin_key = 1;
1670                 port->partner_oper_key  = 1;
1671                 port->partner_admin_port_number = 1;
1672                 port->partner_oper_port_number  = 1;
1673                 port->partner_admin_port_priority = 0xff;
1674                 port->partner_oper_port_priority  = 0xff;
1675                 port->partner_admin_port_state = 1;
1676                 port->partner_oper_port_state  = 1;
1677                 port->is_enabled = 1;
1678                 // ****** private parameters ******
1679                 port->sm_vars = 0x3;
1680                 port->sm_rx_state = 0;
1681                 port->sm_rx_timer_counter = 0;
1682                 port->sm_periodic_state = 0;
1683                 port->sm_periodic_timer_counter = 0;
1684                 port->sm_mux_state = 0;
1685                 port->sm_mux_timer_counter = 0;
1686                 port->sm_tx_state = 0;
1687                 port->sm_tx_timer_counter = 0;
1688                 port->slave = NULL;
1689                 port->aggregator = NULL;
1690                 port->next_port_in_aggregator = NULL;
1691                 port->transaction_id = 0;
1692
1693                 ad_initialize_lacpdu(&(port->lacpdu));
1694         }
1695 }
1696
1697 /**
1698  * ad_enable_collecting_distributing - enable a port's transmit/receive
1699  * @port: the port we're looking at
1700  *
1701  * Enable @port if it's in an active aggregator
1702  */
1703 static void ad_enable_collecting_distributing(struct port *port)
1704 {
1705         if (port->aggregator->is_active) {
1706                 dprintk("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1707                 __enable_port(port);
1708         }
1709 }
1710
1711 /**
1712  * ad_disable_collecting_distributing - disable a port's transmit/receive
1713  * @port: the port we're looking at
1714  *
1715  */
1716 static void ad_disable_collecting_distributing(struct port *port)
1717 {
1718         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1719                 dprintk("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1720                 __disable_port(port);
1721         }
1722 }
1723
1724 #if 0
1725 /**
1726  * ad_marker_info_send - send a marker information frame
1727  * @port: the port we're looking at
1728  *
1729  * This function does nothing since we decided not to implement send and handle
1730  * response for marker PDU's, in this stage, but only to respond to marker
1731  * information.
1732  */
1733 static void ad_marker_info_send(struct port *port)
1734 {
1735         struct marker marker;
1736         u16 index;
1737
1738         // fill the marker PDU with the appropriate values
1739         marker.subtype = 0x02;
1740         marker.version_number = 0x01;
1741         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1742         marker.marker_length = 0x16;
1743         // convert requester_port to Big Endian
1744         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1745         marker.requester_system = port->actor_system;
1746         // convert requester_port(u32) to Big Endian
1747         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1748         marker.pad = 0;
1749         marker.tlv_type_terminator = 0x00;
1750         marker.terminator_length = 0x00;
1751         for (index=0; index<90; index++) {
1752                 marker.reserved_90[index]=0;
1753         }
1754
1755         // send the marker information
1756         if (ad_marker_send(port, &marker) >= 0) {
1757                 dprintk("Sent Marker Information on port %d\n", port->actor_port_number);
1758         }
1759 }
1760 #endif
1761
1762 /**
1763  * ad_marker_info_received - handle receive of a Marker information frame
1764  * @marker_info: Marker info received
1765  * @port: the port we're looking at
1766  *
1767  */
1768 static void ad_marker_info_received(struct marker *marker_info,struct port *port)
1769 {
1770         struct marker marker;
1771
1772         // copy the received marker data to the response marker
1773         //marker = *marker_info;
1774         memcpy(&marker, marker_info, sizeof(struct marker));
1775         // change the marker subtype to marker response
1776         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1777         // send the marker response
1778
1779         if (ad_marker_send(port, &marker) >= 0) {
1780                 dprintk("Sent Marker Response on port %d\n", port->actor_port_number);
1781         }
1782 }
1783
1784 /**
1785  * ad_marker_response_received - handle receive of a marker response frame
1786  * @marker: marker PDU received
1787  * @port: the port we're looking at
1788  *
1789  * This function does nothing since we decided not to implement send and handle
1790  * response for marker PDU's, in this stage, but only to respond to marker
1791  * information.
1792  */
1793 static void ad_marker_response_received(struct marker *marker, struct port *port)
1794 {
1795         marker=NULL; // just to satisfy the compiler
1796         port=NULL;  // just to satisfy the compiler
1797         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1798 }
1799
1800 /**
1801  * ad_initialize_lacpdu - initialize a given lacpdu structure
1802  * @lacpdu: lacpdu structure to initialize
1803  *
1804  */
1805 static void ad_initialize_lacpdu(struct lacpdu *lacpdu)
1806 {
1807         u16 index;
1808
1809         // initialize lacpdu data
1810         lacpdu->subtype = 0x01;
1811         lacpdu->version_number = 0x01;
1812         lacpdu->tlv_type_actor_info = 0x01;
1813         lacpdu->actor_information_length = 0x14;
1814         // lacpdu->actor_system_priority    updated on send
1815         // lacpdu->actor_system             updated on send
1816         // lacpdu->actor_key                updated on send
1817         // lacpdu->actor_port_priority      updated on send
1818         // lacpdu->actor_port               updated on send
1819         // lacpdu->actor_state              updated on send
1820         lacpdu->tlv_type_partner_info = 0x02;
1821         lacpdu->partner_information_length = 0x14;
1822         for (index=0; index<=2; index++) {
1823                 lacpdu->reserved_3_1[index]=0;
1824         }
1825         // lacpdu->partner_system_priority  updated on send
1826         // lacpdu->partner_system           updated on send
1827         // lacpdu->partner_key              updated on send
1828         // lacpdu->partner_port_priority    updated on send
1829         // lacpdu->partner_port             updated on send
1830         // lacpdu->partner_state            updated on send
1831         for (index=0; index<=2; index++) {
1832                 lacpdu->reserved_3_2[index]=0;
1833         }
1834         lacpdu->tlv_type_collector_info = 0x03;
1835         lacpdu->collector_information_length= 0x10;
1836         lacpdu->collector_max_delay = AD_COLLECTOR_MAX_DELAY;
1837         for (index=0; index<=11; index++) {
1838                 lacpdu->reserved_12[index]=0;
1839         }
1840         lacpdu->tlv_type_terminator = 0x00;
1841         lacpdu->terminator_length = 0;
1842         for (index=0; index<=49; index++) {
1843                 lacpdu->reserved_50[index]=0;
1844         }
1845 }
1846
1847 //////////////////////////////////////////////////////////////////////////////////////
1848 // ================= AD exported functions to the main bonding code ==================
1849 //////////////////////////////////////////////////////////////////////////////////////
1850
1851 // Check aggregators status in team every T seconds
1852 #define AD_AGGREGATOR_SELECTION_TIMER  8
1853
1854 static u16 aggregator_identifier;
1855
1856 /**
1857  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1858  * @bond: bonding struct to work on
1859  * @tick_resolution: tick duration (millisecond resolution)
1860  * @lacp_fast: boolean. whether fast periodic should be used
1861  *
1862  * Can be called only after the mac address of the bond is set.
1863  */
1864 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1865 {
1866         // check that the bond is not initialized yet
1867         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr), &(bond->dev->dev_addr))) {
1868
1869                 aggregator_identifier = 0;
1870
1871                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1872                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1873                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1874
1875                 // initialize how many times this module is called in one second(should be about every 100ms)
1876                 ad_ticks_per_sec = tick_resolution;
1877
1878                 // initialize the aggregator selection timer(to activate an aggregation selection after initialize)
1879                 BOND_AD_INFO(bond).agg_select_timer = (AD_AGGREGATOR_SELECTION_TIMER * ad_ticks_per_sec);
1880                 BOND_AD_INFO(bond).agg_select_mode = AD_BANDWIDTH;
1881         }
1882 }
1883
1884 /**
1885  * bond_3ad_bind_slave - initialize a slave's port
1886  * @slave: slave struct to work on
1887  *
1888  * Returns:   0 on success
1889  *          < 0 on error
1890  */
1891 int bond_3ad_bind_slave(struct slave *slave)
1892 {
1893         struct bonding *bond = bond_get_bond_by_slave(slave);
1894         struct port *port;
1895         struct aggregator *aggregator;
1896
1897         if (bond == NULL) {
1898                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1899                        slave->dev->master->name, slave->dev->name);
1900                 return -1;
1901         }
1902
1903         //check that the slave has not been intialized yet.
1904         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1905
1906                 // port initialization
1907                 port = &(SLAVE_AD_INFO(slave).port);
1908
1909                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1910
1911                 port->slave = slave;
1912                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1913                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1914                 //              ------------------------------------------------------------
1915                 // Port key :   | User key                       |      Speed       |Duplex|
1916                 //              ------------------------------------------------------------
1917                 //              16                               6               1 0
1918                 port->actor_admin_port_key = 0; // initialize this parameter
1919                 port->actor_admin_port_key |= __get_duplex(port);
1920                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1921                 port->actor_oper_port_key = port->actor_admin_port_key;
1922                 // if the port is not full duplex, then the port should be not lacp Enabled
1923                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1924                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1925                 }
1926                 // actor system is the bond's system
1927                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1928                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1929                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1930                 port->aggregator = NULL;
1931                 port->next_port_in_aggregator = NULL;
1932
1933                 __disable_port(port);
1934                 __initialize_port_locks(port);
1935
1936
1937                 // aggregator initialization
1938                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1939
1940                 ad_initialize_agg(aggregator);
1941
1942                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1943                 aggregator->aggregator_identifier = (++aggregator_identifier);
1944                 aggregator->slave = slave;
1945                 aggregator->is_active = 0;
1946                 aggregator->num_of_ports = 0;
1947         }
1948
1949         return 0;
1950 }
1951
1952 /**
1953  * bond_3ad_unbind_slave - deinitialize a slave's port
1954  * @slave: slave struct to work on
1955  *
1956  * Search for the aggregator that is related to this port, remove the
1957  * aggregator and assign another aggregator for other port related to it
1958  * (if any), and remove the port.
1959  */
1960 void bond_3ad_unbind_slave(struct slave *slave)
1961 {
1962         struct port *port, *prev_port, *temp_port;
1963         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1964         int select_new_active_agg = 0;
1965
1966         // find the aggregator related to this slave
1967         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1968
1969         // find the port related to this slave
1970         port = &(SLAVE_AD_INFO(slave).port);
1971
1972         // if slave is null, the whole port is not initialized
1973         if (!port->slave) {
1974                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
1975                        "unbind an uninitialized port on %s\n",
1976                        slave->dev->master->name, slave->dev->name);
1977                 return;
1978         }
1979
1980         dprintk("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1981
1982         /* Tell the partner that this port is not suitable for aggregation */
1983         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1984         __update_lacpdu_from_port(port);
1985         ad_lacpdu_send(port);
1986
1987         // check if this aggregator is occupied
1988         if (aggregator->lag_ports) {
1989                 // check if there are other ports related to this aggregator except
1990                 // the port related to this slave(thats ensure us that there is a
1991                 // reason to search for new aggregator, and that we will find one
1992                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1993                         // find new aggregator for the related port(s)
1994                         new_aggregator = __get_first_agg(port);
1995                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1996                                 // if the new aggregator is empty, or it connected to to our port only
1997                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1998                                         break;
1999                                 }
2000                         }
2001                         // if new aggregator found, copy the aggregator's parameters
2002                         // and connect the related lag_ports to the new aggregator
2003                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2004                                 dprintk("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
2005
2006                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
2007                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2008                                                aggregator->slave->dev->master->name);
2009                                         // select new active aggregator
2010                                          select_new_active_agg = 1;
2011                                 }
2012
2013                                 new_aggregator->is_individual = aggregator->is_individual;
2014                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2015                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2016                                 new_aggregator->partner_system = aggregator->partner_system;
2017                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2018                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2019                                 new_aggregator->receive_state = aggregator->receive_state;
2020                                 new_aggregator->transmit_state = aggregator->transmit_state;
2021                                 new_aggregator->lag_ports = aggregator->lag_ports;
2022                                 new_aggregator->is_active = aggregator->is_active;
2023                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2024
2025                                 // update the information that is written on the ports about the aggregator
2026                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2027                                         temp_port->aggregator=new_aggregator;
2028                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2029                                 }
2030
2031                                 // clear the aggregator
2032                                 ad_clear_agg(aggregator);
2033
2034                                 if (select_new_active_agg) {
2035                                         ad_agg_selection_logic(__get_first_agg(port));
2036                                 }
2037                         } else {
2038                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2039                                        "and could not find a new aggregator for its ports\n",
2040                                        slave->dev->master->name);
2041                         }
2042                 } else { // in case that the only port related to this aggregator is the one we want to remove
2043                         select_new_active_agg = aggregator->is_active;
2044                         // clear the aggregator
2045                         ad_clear_agg(aggregator);
2046                         if (select_new_active_agg) {
2047                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2048                                        slave->dev->master->name);
2049                                 // select new active aggregator
2050                                 ad_agg_selection_logic(__get_first_agg(port));
2051                         }
2052                 }
2053         }
2054
2055         dprintk("Unbinding port %d\n", port->actor_port_number);
2056         // find the aggregator that this port is connected to
2057         temp_aggregator = __get_first_agg(port);
2058         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2059                 prev_port = NULL;
2060                 // search the port in the aggregator's related ports
2061                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2062                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2063                                 if (prev_port) {
2064                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2065                                 } else {
2066                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2067                                 }
2068                                 temp_aggregator->num_of_ports--;
2069                                 if (temp_aggregator->num_of_ports==0) {
2070                                         select_new_active_agg = temp_aggregator->is_active;
2071                                         // clear the aggregator
2072                                         ad_clear_agg(temp_aggregator);
2073                                         if (select_new_active_agg) {
2074                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2075                                                        slave->dev->master->name);
2076                                                 // select new active aggregator
2077                                                 ad_agg_selection_logic(__get_first_agg(port));
2078                                         }
2079                                 }
2080                                 break;
2081                         }
2082                 }
2083         }
2084         port->slave=NULL;
2085 }
2086
2087 /**
2088  * bond_3ad_state_machine_handler - handle state machines timeout
2089  * @bond: bonding struct to work on
2090  *
2091  * The state machine handling concept in this module is to check every tick
2092  * which state machine should operate any function. The execution order is
2093  * round robin, so when we have an interaction between state machines, the
2094  * reply of one to each other might be delayed until next tick.
2095  *
2096  * This function also complete the initialization when the agg_select_timer
2097  * times out, and it selects an aggregator for the ports that are yet not
2098  * related to any aggregator, and selects the active aggregator for a bond.
2099  */
2100 void bond_3ad_state_machine_handler(struct bonding *bond)
2101 {
2102         struct port *port;
2103         struct aggregator *aggregator;
2104
2105         read_lock(&bond->lock);
2106
2107         if (bond->kill_timers) {
2108                 goto out;
2109         }
2110
2111         //check if there are any slaves
2112         if (bond->slave_cnt == 0) {
2113                 goto re_arm;
2114         }
2115
2116         // check if agg_select_timer timer after initialize is timed out
2117         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2118                 // select the active aggregator for the bond
2119                 if ((port = __get_first_port(bond))) {
2120                         if (!port->slave) {
2121                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2122                                        "uninitialized\n", bond->dev->name);
2123                                 goto re_arm;
2124                         }
2125
2126                         aggregator = __get_first_agg(port);
2127                         ad_agg_selection_logic(aggregator);
2128                 }
2129         }
2130
2131         // for each port run the state machines
2132         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2133                 if (!port->slave) {
2134                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2135                                "port\n", bond->dev->name);
2136                         goto re_arm;
2137                 }
2138
2139                 ad_rx_machine(NULL, port);
2140                 ad_periodic_machine(port);
2141                 ad_port_selection_logic(port);
2142                 ad_mux_machine(port);
2143                 ad_tx_machine(port);
2144
2145                 // turn off the BEGIN bit, since we already handled it
2146                 if (port->sm_vars & AD_PORT_BEGIN) {
2147                         port->sm_vars &= ~AD_PORT_BEGIN;
2148                 }
2149         }
2150
2151 re_arm:
2152         mod_timer(&(BOND_AD_INFO(bond).ad_timer), jiffies + ad_delta_in_ticks);
2153 out:
2154         read_unlock(&bond->lock);
2155 }
2156
2157 /**
2158  * bond_3ad_rx_indication - handle a received frame
2159  * @lacpdu: received lacpdu
2160  * @slave: slave struct to work on
2161  * @length: length of the data received
2162  *
2163  * It is assumed that frames that were sent on this NIC don't returned as new
2164  * received frames (loopback). Since only the payload is given to this
2165  * function, it check for loopback.
2166  */
2167 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2168 {
2169         struct port *port;
2170
2171         if (length >= sizeof(struct lacpdu)) {
2172
2173                 port = &(SLAVE_AD_INFO(slave).port);
2174
2175                 if (!port->slave) {
2176                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2177                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2178                         return;
2179                 }
2180
2181                 switch (lacpdu->subtype) {
2182                 case AD_TYPE_LACPDU:
2183                         dprintk("Received LACPDU on port %d\n", port->actor_port_number);
2184                         ad_rx_machine(lacpdu, port);
2185                         break;
2186
2187                 case AD_TYPE_MARKER:
2188                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2189
2190                         switch (((struct marker *)lacpdu)->tlv_type) {
2191                         case AD_MARKER_INFORMATION_SUBTYPE:
2192                                 dprintk("Received Marker Information on port %d\n", port->actor_port_number);
2193                                 ad_marker_info_received((struct marker *)lacpdu, port);
2194                                 break;
2195
2196                         case AD_MARKER_RESPONSE_SUBTYPE:
2197                                 dprintk("Received Marker Response on port %d\n", port->actor_port_number);
2198                                 ad_marker_response_received((struct marker *)lacpdu, port);
2199                                 break;
2200
2201                         default:
2202                                 dprintk("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2203                         }
2204                 }
2205         }
2206 }
2207
2208 /**
2209  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2210  * @slave: slave struct to work on
2211  *
2212  * Handle reselection of aggregator (if needed) for this port.
2213  */
2214 void bond_3ad_adapter_speed_changed(struct slave *slave)
2215 {
2216         struct port *port;
2217
2218         port = &(SLAVE_AD_INFO(slave).port);
2219
2220         // if slave is null, the whole port is not initialized
2221         if (!port->slave) {
2222                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2223                        "changed for uninitialized port on %s\n",
2224                        slave->dev->master->name, slave->dev->name);
2225                 return;
2226         }
2227
2228         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2229         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2230         dprintk("Port %d changed speed\n", port->actor_port_number);
2231         // there is no need to reselect a new aggregator, just signal the
2232         // state machines to reinitialize
2233         port->sm_vars |= AD_PORT_BEGIN;
2234 }
2235
2236 /**
2237  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2238  * @slave: slave struct to work on
2239  *
2240  * Handle reselection of aggregator (if needed) for this port.
2241  */
2242 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2243 {
2244         struct port *port;
2245
2246         port=&(SLAVE_AD_INFO(slave).port);
2247
2248         // if slave is null, the whole port is not initialized
2249         if (!port->slave) {
2250                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2251                        "for uninitialized port on %s\n",
2252                        slave->dev->master->name, slave->dev->name);
2253                 return;
2254         }
2255
2256         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2257         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2258         dprintk("Port %d changed duplex\n", port->actor_port_number);
2259         // there is no need to reselect a new aggregator, just signal the
2260         // state machines to reinitialize
2261         port->sm_vars |= AD_PORT_BEGIN;
2262 }
2263
2264 /**
2265  * bond_3ad_handle_link_change - handle a slave's link status change indication
2266  * @slave: slave struct to work on
2267  * @status: whether the link is now up or down
2268  *
2269  * Handle reselection of aggregator (if needed) for this port.
2270  */
2271 void bond_3ad_handle_link_change(struct slave *slave, char link)
2272 {
2273         struct port *port;
2274
2275         port = &(SLAVE_AD_INFO(slave).port);
2276
2277         // if slave is null, the whole port is not initialized
2278         if (!port->slave) {
2279                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2280                        "uninitialized port on %s\n",
2281                         slave->dev->master->name, slave->dev->name);
2282                 return;
2283         }
2284
2285         // 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)
2286         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2287         if (link == BOND_LINK_UP) {
2288                 port->is_enabled = 1;
2289                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2290                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2291                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2292                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2293         } else {
2294                 /* link has failed */
2295                 port->is_enabled = 0;
2296                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2297                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2298         }
2299         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2300         // there is no need to reselect a new aggregator, just signal the
2301         // state machines to reinitialize
2302         port->sm_vars |= AD_PORT_BEGIN;
2303 }
2304
2305 /*
2306  * set link state for bonding master: if we have an active partnered
2307  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2308  * have an active aggregator if there are no slaves with link up.
2309  *
2310  * Called by bond_set_carrier(). Return zero if carrier state does not
2311  * change, nonzero if it does.
2312  */
2313 int bond_3ad_set_carrier(struct bonding *bond)
2314 {
2315         struct aggregator *agg;
2316
2317         agg = __get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator));
2318         if (agg && MAC_ADDRESS_COMPARE(&agg->partner_system, &null_mac_addr)) {
2319                 if (!netif_carrier_ok(bond->dev)) {
2320                         netif_carrier_on(bond->dev);
2321                         return 1;
2322                 }
2323                 return 0;
2324         }
2325
2326         if (netif_carrier_ok(bond->dev)) {
2327                 netif_carrier_off(bond->dev);
2328                 return 1;
2329         }
2330         return 0;
2331 }
2332
2333 /**
2334  * bond_3ad_get_active_agg_info - get information of the active aggregator
2335  * @bond: bonding struct to work on
2336  * @ad_info: ad_info struct to fill with the bond's info
2337  *
2338  * Returns:   0 on success
2339  *          < 0 on error
2340  */
2341 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2342 {
2343         struct aggregator *aggregator = NULL;
2344         struct port *port;
2345
2346         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2347                 if (port->aggregator && port->aggregator->is_active) {
2348                         aggregator = port->aggregator;
2349                         break;
2350                 }
2351         }
2352
2353         if (aggregator) {
2354                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2355                 ad_info->ports = aggregator->num_of_ports;
2356                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2357                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2358                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2359                 return 0;
2360         }
2361
2362         return -1;
2363 }
2364
2365 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2366 {
2367         struct slave *slave, *start_at;
2368         struct bonding *bond = dev->priv;
2369         int slave_agg_no;
2370         int slaves_in_agg;
2371         int agg_id;
2372         int i;
2373         struct ad_info ad_info;
2374         int res = 1;
2375
2376         /* make sure that the slaves list will
2377          * not change during tx
2378          */
2379         read_lock(&bond->lock);
2380
2381         if (!BOND_IS_OK(bond)) {
2382                 goto out;
2383         }
2384
2385         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2386                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2387                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2388                 goto out;
2389         }
2390
2391         slaves_in_agg = ad_info.ports;
2392         agg_id = ad_info.aggregator_id;
2393
2394         if (slaves_in_agg == 0) {
2395                 /*the aggregator is empty*/
2396                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2397                        "aggregator is empty\n",
2398                        dev->name);
2399                 goto out;
2400         }
2401
2402         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2403
2404         bond_for_each_slave(bond, slave, i) {
2405                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2406
2407                 if (agg && (agg->aggregator_identifier == agg_id)) {
2408                         slave_agg_no--;
2409                         if (slave_agg_no < 0) {
2410                                 break;
2411                         }
2412                 }
2413         }
2414
2415         if (slave_agg_no >= 0) {
2416                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2417                        "for aggregator ID %d\n", dev->name, agg_id);
2418                 goto out;
2419         }
2420
2421         start_at = slave;
2422
2423         bond_for_each_slave_from(bond, slave, i, start_at) {
2424                 int slave_agg_id = 0;
2425                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2426
2427                 if (agg) {
2428                         slave_agg_id = agg->aggregator_identifier;
2429                 }
2430
2431                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2432                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2433                         break;
2434                 }
2435         }
2436
2437 out:
2438         if (res) {
2439                 /* no suitable interface, frame not sent */
2440                 dev_kfree_skb(skb);
2441         }
2442         read_unlock(&bond->lock);
2443         return 0;
2444 }
2445
2446 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2447 {
2448         struct bonding *bond = dev->priv;
2449         struct slave *slave = NULL;
2450         int ret = NET_RX_DROP;
2451
2452         if (!(dev->flags & IFF_MASTER))
2453                 goto out;
2454
2455         read_lock(&bond->lock);
2456         slave = bond_get_slave_by_dev((struct bonding *)dev->priv, orig_dev);
2457         if (!slave)
2458                 goto out_unlock;
2459
2460         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2461
2462         ret = NET_RX_SUCCESS;
2463
2464 out_unlock:
2465         read_unlock(&bond->lock);
2466 out:
2467         dev_kfree_skb(skb);
2468
2469         return ret;
2470 }
2471