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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  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/etherdevice.h>
  31 #include <linux/if_bonding.h>
  32 #include <linux/pkt_sched.h>
  33 #include <net/net_namespace.h>
  34 #include "bonding.h"
  35 #include "bond_3ad.h"
  36
  37 // General definitions
  38 #define AD_SHORT_TIMEOUT           1
  39 #define AD_LONG_TIMEOUT            0
  40 #define AD_STANDBY                 0x2
  41 #define AD_MAX_TX_IN_SECOND        3
  42 #define AD_COLLECTOR_MAX_DELAY     0
  43
  44 // Timer definitions(43.4.4 in the 802.3ad standard)
  45 #define AD_FAST_PERIODIC_TIME      1
  46 #define AD_SLOW_PERIODIC_TIME      30
  47 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  48 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  49 #define AD_CHURN_DETECTION_TIME    60
  50 #define AD_AGGREGATE_WAIT_TIME     2
  51
  52 // Port state definitions(43.4.2.2 in the 802.3ad standard)
  53 #define AD_STATE_LACP_ACTIVITY   0x1
  54 #define AD_STATE_LACP_TIMEOUT    0x2
  55 #define AD_STATE_AGGREGATION     0x4
  56 #define AD_STATE_SYNCHRONIZATION 0x8
  57 #define AD_STATE_COLLECTING      0x10
  58 #define AD_STATE_DISTRIBUTING    0x20
  59 #define AD_STATE_DEFAULTED       0x40
  60 #define AD_STATE_EXPIRED         0x80
  61
  62 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
  63 #define AD_PORT_BEGIN           0x1
  64 #define AD_PORT_LACP_ENABLED    0x2
  65 #define AD_PORT_ACTOR_CHURN     0x4
  66 #define AD_PORT_PARTNER_CHURN   0x8
  67 #define AD_PORT_READY           0x10
  68 #define AD_PORT_READY_N         0x20
  69 #define AD_PORT_MATCHED         0x40
  70 #define AD_PORT_STANDBY         0x80
  71 #define AD_PORT_SELECTED        0x100
  72 #define AD_PORT_MOVED           0x200
  73
  74 // Port Key definitions
  75 // key is determined according to the link speed, duplex and
  76 // user key(which is yet not supported)
  77 //              ------------------------------------------------------------
  78 // Port key :   | User key                       |      Speed       |Duplex|
  79 //              ------------------------------------------------------------
  80 //              16                               6               1 0
  81 #define  AD_DUPLEX_KEY_BITS    0x1
  82 #define  AD_SPEED_KEY_BITS     0x3E
  83 #define  AD_USER_KEY_BITS      0xFFC0
  84
  85 //dalloun
  86 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  87 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  88 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  89 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  90 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  91 //endalloun
  92
  93 // compare MAC addresses
  94 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  95
  96 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
  97 static u16 ad_ticks_per_sec;
  98 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  99
 100 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 101
 102 // ================= main 802.3ad protocol functions ==================
 103 static int ad_lacpdu_send(struct port *port);
 104 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 105 static void ad_mux_machine(struct port *port);
 106 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 107 static void ad_tx_machine(struct port *port);
 108 static void ad_periodic_machine(struct port *port);
 109 static void ad_port_selection_logic(struct port *port);
 110 static void ad_agg_selection_logic(struct aggregator *aggregator);
 111 static void ad_clear_agg(struct aggregator *aggregator);
 112 static void ad_initialize_agg(struct aggregator *aggregator);
 113 static void ad_initialize_port(struct port *port, int lacp_fast);
 114 static void ad_enable_collecting_distributing(struct port *port);
 115 static void ad_disable_collecting_distributing(struct port *port);
 116 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 117 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 118
 119
 120 /////////////////////////////////////////////////////////////////////////////////
 121 // ================= api to bonding and kernel code ==================
 122 /////////////////////////////////////////////////////////////////////////////////
 123
 124 /**
 125  * __get_bond_by_port - get the port's bonding struct
 126  * @port: the port we're looking at
 127  *
 128  * Return @port's bonding struct, or %NULL if it can't be found.
 129  */
 130 static inline struct bonding *__get_bond_by_port(struct port *port)
 131 {
 132         if (port->slave == NULL)
 133                 return NULL;
 134
 135         return bond_get_bond_by_slave(port->slave);
 136 }
 137
 138 /**
 139  * __get_first_port - get the first port in the bond
 140  * @bond: the bond we're looking at
 141  *
 142  * Return the port of the first slave in @bond, or %NULL if it can't be found.
 143  */
 144 static inline struct port *__get_first_port(struct bonding *bond)
 145 {
 146         if (bond->slave_cnt == 0)
 147                 return NULL;
 148
 149         return &(SLAVE_AD_INFO(bond->first_slave).port);
 150 }
 151
 152 /**
 153  * __get_next_port - get the next port in the bond
 154  * @port: the port we're looking at
 155  *
 156  * Return the port of the slave that is next in line of @port's slave in the
 157  * bond, or %NULL if it can't be found.
 158  */
 159 static inline struct port *__get_next_port(struct port *port)
 160 {
 161         struct bonding *bond = __get_bond_by_port(port);
 162         struct slave *slave = port->slave;
 163
 164         // If there's no bond for this port, or this is the last slave
 165         if ((bond == NULL) || (slave->next == bond->first_slave))
 166                 return NULL;
 167
 168         return &(SLAVE_AD_INFO(slave->next).port);
 169 }
 170
 171 /**
 172  * __get_first_agg - get the first aggregator in the bond
 173  * @bond: the bond we're looking at
 174  *
 175  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 176  * found.
 177  */
 178 static inline struct aggregator *__get_first_agg(struct port *port)
 179 {
 180         struct bonding *bond = __get_bond_by_port(port);
 181
 182         // If there's no bond for this port, or bond has no slaves
 183         if ((bond == NULL) || (bond->slave_cnt == 0))
 184                 return NULL;
 185
 186         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
 187 }
 188
 189 /**
 190  * __get_next_agg - get the next aggregator in the bond
 191  * @aggregator: the aggregator we're looking at
 192  *
 193  * Return the aggregator of the slave that is next in line of @aggregator's
 194  * slave in the bond, or %NULL if it can't be found.
 195  */
 196 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
 197 {
 198         struct slave *slave = aggregator->slave;
 199         struct bonding *bond = bond_get_bond_by_slave(slave);
 200
 201         // If there's no bond for this aggregator, or this is the last slave
 202         if ((bond == NULL) || (slave->next == bond->first_slave))
 203                 return NULL;
 204
 205         return &(SLAVE_AD_INFO(slave->next).aggregator);
 206 }
 207
 208 /*
 209  * __agg_has_partner
 210  *
 211  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 212  * address for the partner).  Return 0 if not.
 213  */
 214 static inline int __agg_has_partner(struct aggregator *agg)
 215 {
 216         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 217 }
 218
 219 /**
 220  * __disable_port - disable the port's slave
 221  * @port: the port we're looking at
 222  *
 223  */
 224 static inline void __disable_port(struct port *port)
 225 {
 226         bond_set_slave_inactive_flags(port->slave);
 227 }
 228
 229 /**
 230  * __enable_port - enable the port's slave, if it's up
 231  * @port: the port we're looking at
 232  *
 233  */
 234 static inline void __enable_port(struct port *port)
 235 {
 236         struct slave *slave = port->slave;
 237
 238         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
 239                 bond_set_slave_active_flags(slave);
 240 }
 241
 242 /**
 243  * __port_is_enabled - check if the port's slave is in active state
 244  * @port: the port we're looking at
 245  *
 246  */
 247 static inline int __port_is_enabled(struct port *port)
 248 {
 249         return bond_is_active_slave(port->slave);
 250 }
 251
 252 /**
 253  * __get_agg_selection_mode - get the aggregator selection mode
 254  * @port: the port we're looking at
 255  *
 256  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 257  */
 258 static inline u32 __get_agg_selection_mode(struct port *port)
 259 {
 260         struct bonding *bond = __get_bond_by_port(port);
 261
 262         if (bond == NULL)
 263                 return BOND_AD_STABLE;
 264
 265         return bond->params.ad_select;
 266 }
 267
 268 /**
 269  * __check_agg_selection_timer - check if the selection timer has expired
 270  * @port: the port we're looking at
 271  *
 272  */
 273 static inline int __check_agg_selection_timer(struct port *port)
 274 {
 275         struct bonding *bond = __get_bond_by_port(port);
 276
 277         if (bond == NULL)
 278                 return 0;
 279
 280         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 281 }
 282
 283 /**
 284  * __get_state_machine_lock - lock the port's state machines
 285  * @port: the port we're looking at
 286  *
 287  */
 288 static inline void __get_state_machine_lock(struct port *port)
 289 {
 290         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 291 }
 292
 293 /**
 294  * __release_state_machine_lock - unlock the port's state machines
 295  * @port: the port we're looking at
 296  *
 297  */
 298 static inline void __release_state_machine_lock(struct port *port)
 299 {
 300         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 301 }
 302
 303 /**
 304  * __get_link_speed - get a port's speed
 305  * @port: the port we're looking at
 306  *
 307  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 308  *     0,
 309  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 310  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 311  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 312  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 313  */
 314 static u16 __get_link_speed(struct port *port)
 315 {
 316         struct slave *slave = port->slave;
 317         u16 speed;
 318
 319         /* this if covers only a special case: when the configuration starts with
 320          * link down, it sets the speed to 0.
 321          * This is done in spite of the fact that the e100 driver reports 0 to be
 322          * compatible with MVT in the future.*/
 323         if (slave->link != BOND_LINK_UP)
 324                 speed = 0;
 325         else {
 326                 switch (slave->speed) {
 327                 case SPEED_10:
 328                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 329                         break;
 330
 331                 case SPEED_100:
 332                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 333                         break;
 334
 335                 case SPEED_1000:
 336                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 337                         break;
 338
 339                 case SPEED_10000:
 340                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 341                         break;
 342
 343                 default:
 344                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 345                         break;
 346                 }
 347         }
 348
 349         pr_debug("Port %d Received link speed %d update from adapter\n",
 350                  port->actor_port_number, speed);
 351         return speed;
 352 }
 353
 354 /**
 355  * __get_duplex - get a port's duplex
 356  * @port: the port we're looking at
 357  *
 358  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 359  *     0x01 if in full duplex
 360  *     0x00 otherwise
 361  */
 362 static u8 __get_duplex(struct port *port)
 363 {
 364         struct slave *slave = port->slave;
 365
 366         u8 retval;
 367
 368         //  handling a special case: when the configuration starts with
 369         // link down, it sets the duplex to 0.
 370         if (slave->link != BOND_LINK_UP)
 371                 retval = 0x0;
 372         else {
 373                 switch (slave->duplex) {
 374                 case DUPLEX_FULL:
 375                         retval = 0x1;
 376                         pr_debug("Port %d Received status full duplex update from adapter\n",
 377                                  port->actor_port_number);
 378                         break;
 379                 case DUPLEX_HALF:
 380                 default:
 381                         retval = 0x0;
 382                         pr_debug("Port %d Received status NOT full duplex update from adapter\n",
 383                                  port->actor_port_number);
 384                         break;
 385                 }
 386         }
 387         return retval;
 388 }
 389
 390 /**
 391  * __initialize_port_locks - initialize a port's STATE machine spinlock
 392  * @port: the port we're looking at
 393  *
 394  */
 395 static inline void __initialize_port_locks(struct port *port)
 396 {
 397         // make sure it isn't called twice
 398         spin_lock_init(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 399 }
 400
 401 //conversions
 402
 403 /**
 404  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 405  * @timer_type: which timer to operate
 406  * @par: timer parameter. see below
 407  *
 408  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 409  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 410  *                                                  %SLOW_PERIODIC_TIME.
 411  */
 412 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 413 {
 414         u16 retval = 0; /* to silence the compiler */
 415
 416         switch (timer_type) {
 417         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 418                 if (par)
 419                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 420                 else
 421                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 422                 break;
 423         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 424                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 425                 break;
 426         case AD_PERIODIC_TIMER:     // for periodic machine
 427                 retval = (par*ad_ticks_per_sec); // long timeout
 428                 break;
 429         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 430                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 431                 break;
 432         case AD_WAIT_WHILE_TIMER:           // for selection machine
 433                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 434                 break;
 435         }
 436         return retval;
 437 }
 438
 439
 440 /////////////////////////////////////////////////////////////////////////////////
 441 // ================= ad_rx_machine helper functions ==================
 442 /////////////////////////////////////////////////////////////////////////////////
 443
 444 /**
 445  * __choose_matched - update a port's matched variable from a received lacpdu
 446  * @lacpdu: the lacpdu we've received
 447  * @port: the port we're looking at
 448  *
 449  * Update the value of the matched variable, using parameter values from a
 450  * newly received lacpdu. Parameter values for the partner carried in the
 451  * received PDU are compared with the corresponding operational parameter
 452  * values for the actor. Matched is set to TRUE if all of these parameters
 453  * match and the PDU parameter partner_state.aggregation has the same value as
 454  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 455  * in the aggregation. Matched is also set to TRUE if the value of
 456  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 457  * an individual link and lacp will actively maintain the link. Otherwise,
 458  * matched is set to FALSE. LACP is considered to be actively maintaining the
 459  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 460  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 461  * partner_state.lacp_activity variables are TRUE.
 462  *
 463  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 464  * used here to implement the language from 802.3ad 43.4.9 that requires
 465  * recordPDU to "match" the LACPDU parameters to the stored values.
 466  */
 467 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 468 {
 469         // check if all parameters are alike
 470         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 471              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 472              !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 473              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 474              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 475              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 476             // or this is individual link(aggregation == FALSE)
 477             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 478                 ) {
 479                 // update the state machine Matched variable
 480                 port->sm_vars |= AD_PORT_MATCHED;
 481         } else {
 482                 port->sm_vars &= ~AD_PORT_MATCHED;
 483         }
 484 }
 485
 486 /**
 487  * __record_pdu - record parameters from a received lacpdu
 488  * @lacpdu: the lacpdu we've received
 489  * @port: the port we're looking at
 490  *
 491  * Record the parameter values for the Actor carried in a received lacpdu as
 492  * the current partner operational parameter values and sets
 493  * actor_oper_port_state.defaulted to FALSE.
 494  */
 495 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 496 {
 497         if (lacpdu && port) {
 498                 struct port_params *partner = &port->partner_oper;
 499
 500                 __choose_matched(lacpdu, port);
 501                 // record the new parameter values for the partner operational
 502                 partner->port_number = ntohs(lacpdu->actor_port);
 503                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 504                 partner->system = lacpdu->actor_system;
 505                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 506                 partner->key = ntohs(lacpdu->actor_key);
 507                 partner->port_state = lacpdu->actor_state;
 508
 509                 // set actor_oper_port_state.defaulted to FALSE
 510                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 511
 512                 // set the partner sync. to on if the partner is sync. and the port is matched
 513                 if ((port->sm_vars & AD_PORT_MATCHED)
 514                     && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
 515                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 516                 else
 517                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 518         }
 519 }
 520
 521 /**
 522  * __record_default - record default parameters
 523  * @port: the port we're looking at
 524  *
 525  * This function records the default parameter values for the partner carried
 526  * in the Partner Admin parameters as the current partner operational parameter
 527  * values and sets actor_oper_port_state.defaulted to TRUE.
 528  */
 529 static void __record_default(struct port *port)
 530 {
 531         if (port) {
 532                 // record the partner admin parameters
 533                 memcpy(&port->partner_oper, &port->partner_admin,
 534                        sizeof(struct port_params));
 535
 536                 // set actor_oper_port_state.defaulted to true
 537                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 538         }
 539 }
 540
 541 /**
 542  * __update_selected - update a port's Selected variable from a received lacpdu
 543  * @lacpdu: the lacpdu we've received
 544  * @port: the port we're looking at
 545  *
 546  * Update the value of the selected variable, using parameter values from a
 547  * newly received lacpdu. The parameter values for the Actor carried in the
 548  * received PDU are compared with the corresponding operational parameter
 549  * values for the ports partner. If one or more of the comparisons shows that
 550  * the value(s) received in the PDU differ from the current operational values,
 551  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 552  * set to out_of_sync. Otherwise, selected remains unchanged.
 553  */
 554 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 555 {
 556         if (lacpdu && port) {
 557                 const struct port_params *partner = &port->partner_oper;
 558
 559                 // check if any parameter is different
 560                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 561                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 562                     MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system) ||
 563                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 564                     ntohs(lacpdu->actor_key) != partner->key ||
 565                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 566                         // update the state machine Selected variable
 567                         port->sm_vars &= ~AD_PORT_SELECTED;
 568                 }
 569         }
 570 }
 571
 572 /**
 573  * __update_default_selected - update a port's Selected variable from Partner
 574  * @port: the port we're looking at
 575  *
 576  * This function updates the value of the selected variable, using the partner
 577  * administrative parameter values. The administrative values are compared with
 578  * the corresponding operational parameter values for the partner. If one or
 579  * more of the comparisons shows that the administrative value(s) differ from
 580  * the current operational values, then Selected is set to FALSE and
 581  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 582  * Selected remains unchanged.
 583  */
 584 static void __update_default_selected(struct port *port)
 585 {
 586         if (port) {
 587                 const struct port_params *admin = &port->partner_admin;
 588                 const struct port_params *oper = &port->partner_oper;
 589
 590                 // check if any parameter is different
 591                 if (admin->port_number != oper->port_number ||
 592                     admin->port_priority != oper->port_priority ||
 593                     MAC_ADDRESS_COMPARE(&admin->system, &oper->system) ||
 594                     admin->system_priority != oper->system_priority ||
 595                     admin->key != oper->key ||
 596                     (admin->port_state & AD_STATE_AGGREGATION)
 597                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 598                         // update the state machine Selected variable
 599                         port->sm_vars &= ~AD_PORT_SELECTED;
 600                 }
 601         }
 602 }
 603
 604 /**
 605  * __update_ntt - update a port's ntt variable from a received lacpdu
 606  * @lacpdu: the lacpdu we've received
 607  * @port: the port we're looking at
 608  *
 609  * Updates the value of the ntt variable, using parameter values from a newly
 610  * received lacpdu. The parameter values for the partner carried in the
 611  * received PDU are compared with the corresponding operational parameter
 612  * values for the Actor. If one or more of the comparisons shows that the
 613  * value(s) received in the PDU differ from the current operational values,
 614  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 615  */
 616 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 617 {
 618         // validate lacpdu and port
 619         if (lacpdu && port) {
 620                 // check if any parameter is different
 621                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 622                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 623                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 624                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 625                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 626                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 627                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 628                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 629                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 630                    ) {
 631
 632                         port->ntt = true;
 633                 }
 634         }
 635 }
 636
 637 /**
 638  * __attach_bond_to_agg
 639  * @port: the port we're looking at
 640  *
 641  * Handle the attaching of the port's control parser/multiplexer and the
 642  * aggregator. This function does nothing since the parser/multiplexer of the
 643  * receive and the parser/multiplexer of the aggregator are already combined.
 644  */
 645 static void __attach_bond_to_agg(struct port *port)
 646 {
 647         port = NULL; /* just to satisfy the compiler */
 648         // This function does nothing since the parser/multiplexer of the receive
 649         // and the parser/multiplexer of the aggregator are already combined
 650 }
 651
 652 /**
 653  * __detach_bond_from_agg
 654  * @port: the port we're looking at
 655  *
 656  * Handle the detaching of the port's control parser/multiplexer from the
 657  * aggregator. This function does nothing since the parser/multiplexer of the
 658  * receive and the parser/multiplexer of the aggregator are already combined.
 659  */
 660 static void __detach_bond_from_agg(struct port *port)
 661 {
 662         port = NULL; /* just to satisfy the compiler */
 663         // This function does nothing sience the parser/multiplexer of the receive
 664         // and the parser/multiplexer of the aggregator are already combined
 665 }
 666
 667 /**
 668  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 669  * @aggregator: the aggregator we're looking at
 670  *
 671  */
 672 static int __agg_ports_are_ready(struct aggregator *aggregator)
 673 {
 674         struct port *port;
 675         int retval = 1;
 676
 677         if (aggregator) {
 678                 // scan all ports in this aggregator to verfy if they are all ready
 679                 for (port = aggregator->lag_ports;
 680                      port;
 681                      port = port->next_port_in_aggregator) {
 682                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 683                                 retval = 0;
 684                                 break;
 685                         }
 686                 }
 687         }
 688
 689         return retval;
 690 }
 691
 692 /**
 693  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 694  * @aggregator: the aggregator we're looking at
 695  * @val: Should the ports' ready bit be set on or off
 696  *
 697  */
 698 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 699 {
 700         struct port *port;
 701
 702         for (port = aggregator->lag_ports; port;
 703              port = port->next_port_in_aggregator) {
 704                 if (val)
 705                         port->sm_vars |= AD_PORT_READY;
 706                 else
 707                         port->sm_vars &= ~AD_PORT_READY;
 708         }
 709 }
 710
 711 /**
 712  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 713  * @aggregator: the aggregator we're looking at
 714  *
 715  */
 716 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 717 {
 718         u32 bandwidth = 0;
 719
 720         if (aggregator->num_of_ports) {
 721                 switch (__get_link_speed(aggregator->lag_ports)) {
 722                 case AD_LINK_SPEED_BITMASK_1MBPS:
 723                         bandwidth = aggregator->num_of_ports;
 724                         break;
 725                 case AD_LINK_SPEED_BITMASK_10MBPS:
 726                         bandwidth = aggregator->num_of_ports * 10;
 727                         break;
 728                 case AD_LINK_SPEED_BITMASK_100MBPS:
 729                         bandwidth = aggregator->num_of_ports * 100;
 730                         break;
 731                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 732                         bandwidth = aggregator->num_of_ports * 1000;
 733                         break;
 734                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 735                         bandwidth = aggregator->num_of_ports * 10000;
 736                         break;
 737                 default:
 738                         bandwidth = 0; /*to silence the compiler ....*/
 739                 }
 740         }
 741         return bandwidth;
 742 }
 743
 744 /**
 745  * __get_active_agg - get the current active aggregator
 746  * @aggregator: the aggregator we're looking at
 747  *
 748  */
 749 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 750 {
 751         struct aggregator *retval = NULL;
 752
 753         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 754                 if (aggregator->is_active) {
 755                         retval = aggregator;
 756                         break;
 757                 }
 758         }
 759
 760         return retval;
 761 }
 762
 763 /**
 764  * __update_lacpdu_from_port - update a port's lacpdu fields
 765  * @port: the port we're looking at
 766  *
 767  */
 768 static inline void __update_lacpdu_from_port(struct port *port)
 769 {
 770         struct lacpdu *lacpdu = &port->lacpdu;
 771         const struct port_params *partner = &port->partner_oper;
 772
 773         /* update current actual Actor parameters */
 774         /* lacpdu->subtype                   initialized
 775          * lacpdu->version_number            initialized
 776          * lacpdu->tlv_type_actor_info       initialized
 777          * lacpdu->actor_information_length  initialized
 778          */
 779
 780         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 781         lacpdu->actor_system = port->actor_system;
 782         lacpdu->actor_key = htons(port->actor_oper_port_key);
 783         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 784         lacpdu->actor_port = htons(port->actor_port_number);
 785         lacpdu->actor_state = port->actor_oper_port_state;
 786
 787         /* lacpdu->reserved_3_1              initialized
 788          * lacpdu->tlv_type_partner_info     initialized
 789          * lacpdu->partner_information_length initialized
 790          */
 791
 792         lacpdu->partner_system_priority = htons(partner->system_priority);
 793         lacpdu->partner_system = partner->system;
 794         lacpdu->partner_key = htons(partner->key);
 795         lacpdu->partner_port_priority = htons(partner->port_priority);
 796         lacpdu->partner_port = htons(partner->port_number);
 797         lacpdu->partner_state = partner->port_state;
 798
 799         /* lacpdu->reserved_3_2              initialized
 800          * lacpdu->tlv_type_collector_info   initialized
 801          * lacpdu->collector_information_length initialized
 802          * collector_max_delay                initialized
 803          * reserved_12[12]                   initialized
 804          * tlv_type_terminator               initialized
 805          * terminator_length                 initialized
 806          * reserved_50[50]                   initialized
 807          */
 808 }
 809
 810 //////////////////////////////////////////////////////////////////////////////////////
 811 // ================= main 802.3ad protocol code ======================================
 812 //////////////////////////////////////////////////////////////////////////////////////
 813
 814 /**
 815  * ad_lacpdu_send - send out a lacpdu packet on a given port
 816  * @port: the port we're looking at
 817  *
 818  * Returns:   0 on success
 819  *          < 0 on error
 820  */
 821 static int ad_lacpdu_send(struct port *port)
 822 {
 823         struct slave *slave = port->slave;
 824         struct sk_buff *skb;
 825         struct lacpdu_header *lacpdu_header;
 826         int length = sizeof(struct lacpdu_header);
 827
 828         skb = dev_alloc_skb(length);
 829         if (!skb)
 830                 return -ENOMEM;
 831
 832         skb->dev = slave->dev;
 833         skb_reset_mac_header(skb);
 834         skb->network_header = skb->mac_header + ETH_HLEN;
 835         skb->protocol = PKT_TYPE_LACPDU;
 836         skb->priority = TC_PRIO_CONTROL;
 837
 838         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 839
 840         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 841         /* Note: source address is set to be the member's PERMANENT address,
 842            because we use it to identify loopback lacpdus in receive. */
 843         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 844         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 845
 846         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 847
 848         dev_queue_xmit(skb);
 849
 850         return 0;
 851 }
 852
 853 /**
 854  * ad_marker_send - send marker information/response on a given port
 855  * @port: the port we're looking at
 856  * @marker: marker data to send
 857  *
 858  * Returns:   0 on success
 859  *          < 0 on error
 860  */
 861 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 862 {
 863         struct slave *slave = port->slave;
 864         struct sk_buff *skb;
 865         struct bond_marker_header *marker_header;
 866         int length = sizeof(struct bond_marker_header);
 867
 868         skb = dev_alloc_skb(length + 16);
 869         if (!skb)
 870                 return -ENOMEM;
 871
 872         skb_reserve(skb, 16);
 873
 874         skb->dev = slave->dev;
 875         skb_reset_mac_header(skb);
 876         skb->network_header = skb->mac_header + ETH_HLEN;
 877         skb->protocol = PKT_TYPE_LACPDU;
 878
 879         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 880
 881         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 882         /* Note: source address is set to be the member's PERMANENT address,
 883            because we use it to identify loopback MARKERs in receive. */
 884         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 885         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 886
 887         marker_header->marker = *marker; // struct copy
 888
 889         dev_queue_xmit(skb);
 890
 891         return 0;
 892 }
 893
 894 /**
 895  * ad_mux_machine - handle a port's mux state machine
 896  * @port: the port we're looking at
 897  *
 898  */
 899 static void ad_mux_machine(struct port *port)
 900 {
 901         mux_states_t last_state;
 902
 903         // keep current State Machine state to compare later if it was changed
 904         last_state = port->sm_mux_state;
 905
 906         if (port->sm_vars & AD_PORT_BEGIN) {
 907                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 908         } else {
 909                 switch (port->sm_mux_state) {
 910                 case AD_MUX_DETACHED:
 911                         if ((port->sm_vars & AD_PORT_SELECTED)
 912                             || (port->sm_vars & AD_PORT_STANDBY))
 913                                 /* if SELECTED or STANDBY */
 914                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 915                         break;
 916                 case AD_MUX_WAITING:
 917                         // if SELECTED == FALSE return to DETACH state
 918                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 919                                 port->sm_vars &= ~AD_PORT_READY_N;
 920                                 // in order to withhold the Selection Logic to check all ports READY_N value
 921                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 922                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 923                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 924                                 break;
 925                         }
 926
 927                         // check if the wait_while_timer expired
 928                         if (port->sm_mux_timer_counter
 929                             && !(--port->sm_mux_timer_counter))
 930                                 port->sm_vars |= AD_PORT_READY_N;
 931
 932                         // in order to withhold the selection logic to check all ports READY_N value
 933                         // every callback cycle to update ready variable, we check READY_N and update READY here
 934                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 935
 936                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 937                         if ((port->sm_vars & AD_PORT_READY)
 938                             && !port->sm_mux_timer_counter)
 939                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 940                         break;
 941                 case AD_MUX_ATTACHED:
 942                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 943                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 944                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 945                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 946                                 port->sm_vars &= ~AD_PORT_READY_N;
 947                                 // in order to withhold the selection logic to check all ports READY_N value
 948                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 949                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 950                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 951                         }
 952                         break;
 953                 case AD_MUX_COLLECTING_DISTRIBUTING:
 954                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 955                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 956                            ) {
 957                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 958
 959                         } else {
 960                                 // if port state hasn't changed make
 961                                 // sure that a collecting distributing
 962                                 // port in an active aggregator is enabled
 963                                 if (port->aggregator &&
 964                                     port->aggregator->is_active &&
 965                                     !__port_is_enabled(port)) {
 966
 967                                         __enable_port(port);
 968                                 }
 969                         }
 970                         break;
 971                 default:    //to silence the compiler
 972                         break;
 973                 }
 974         }
 975
 976         // check if the state machine was changed
 977         if (port->sm_mux_state != last_state) {
 978                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
 979                          port->actor_port_number, last_state,
 980                          port->sm_mux_state);
 981                 switch (port->sm_mux_state) {
 982                 case AD_MUX_DETACHED:
 983                         __detach_bond_from_agg(port);
 984                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 985                         ad_disable_collecting_distributing(port);
 986                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 987                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 988                         port->ntt = true;
 989                         break;
 990                 case AD_MUX_WAITING:
 991                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 992                         break;
 993                 case AD_MUX_ATTACHED:
 994                         __attach_bond_to_agg(port);
 995                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 996                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 997                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 998                         ad_disable_collecting_distributing(port);
 999                         port->ntt = true;
1000                         break;
1001                 case AD_MUX_COLLECTING_DISTRIBUTING:
1002                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1003                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1004                         ad_enable_collecting_distributing(port);
1005                         port->ntt = true;
1006                         break;
1007                 default:    //to silence the compiler
1008                         break;
1009                 }
1010         }
1011 }
1012
1013 /**
1014  * ad_rx_machine - handle a port's rx State Machine
1015  * @lacpdu: the lacpdu we've received
1016  * @port: the port we're looking at
1017  *
1018  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1019  * CURRENT. If timer expired set the state machine in the proper state.
1020  * In other cases, this function checks if we need to switch to other state.
1021  */
1022 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1023 {
1024         rx_states_t last_state;
1025
1026         // keep current State Machine state to compare later if it was changed
1027         last_state = port->sm_rx_state;
1028
1029         // check if state machine should change state
1030         // first, check if port was reinitialized
1031         if (port->sm_vars & AD_PORT_BEGIN)
1032                 /* next state */
1033                 port->sm_rx_state = AD_RX_INITIALIZE;
1034         // check if port is not enabled
1035         else if (!(port->sm_vars & AD_PORT_BEGIN)
1036                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1037                 /* next state */
1038                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1039         // check if new lacpdu arrived
1040         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1041                 port->sm_rx_timer_counter = 0; // zero timer
1042                 port->sm_rx_state = AD_RX_CURRENT;
1043         } else {
1044                 // if timer is on, and if it is expired
1045                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1046                         switch (port->sm_rx_state) {
1047                         case AD_RX_EXPIRED:
1048                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1049                                 break;
1050                         case AD_RX_CURRENT:
1051                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1052                                 break;
1053                         default:    //to silence the compiler
1054                                 break;
1055                         }
1056                 } else {
1057                         // if no lacpdu arrived and no timer is on
1058                         switch (port->sm_rx_state) {
1059                         case AD_RX_PORT_DISABLED:
1060                                 if (port->sm_vars & AD_PORT_MOVED)
1061                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1062                                 else if (port->is_enabled
1063                                          && (port->sm_vars
1064                                              & AD_PORT_LACP_ENABLED))
1065                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1066                                 else if (port->is_enabled
1067                                          && ((port->sm_vars
1068                                               & AD_PORT_LACP_ENABLED) == 0))
1069                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1070                                 break;
1071                         default:    //to silence the compiler
1072                                 break;
1073
1074                         }
1075                 }
1076         }
1077
1078         // check if the State machine was changed or new lacpdu arrived
1079         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1080                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1081                          port->actor_port_number, last_state,
1082                          port->sm_rx_state);
1083                 switch (port->sm_rx_state) {
1084                 case AD_RX_INITIALIZE:
1085                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1086                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1087                         else
1088                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1089                         port->sm_vars &= ~AD_PORT_SELECTED;
1090                         __record_default(port);
1091                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1092                         port->sm_vars &= ~AD_PORT_MOVED;
1093                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1094
1095                         /*- Fall Through -*/
1096
1097                 case AD_RX_PORT_DISABLED:
1098                         port->sm_vars &= ~AD_PORT_MATCHED;
1099                         break;
1100                 case AD_RX_LACP_DISABLED:
1101                         port->sm_vars &= ~AD_PORT_SELECTED;
1102                         __record_default(port);
1103                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1104                         port->sm_vars |= AD_PORT_MATCHED;
1105                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1106                         break;
1107                 case AD_RX_EXPIRED:
1108                         //Reset of the Synchronization flag. (Standard 43.4.12)
1109                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1110                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1111                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1112                         port->sm_vars &= ~AD_PORT_MATCHED;
1113                         port->partner_oper.port_state |=
1114                                 AD_STATE_LACP_ACTIVITY;
1115                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1116                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1117                         break;
1118                 case AD_RX_DEFAULTED:
1119                         __update_default_selected(port);
1120                         __record_default(port);
1121                         port->sm_vars |= AD_PORT_MATCHED;
1122                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1123                         break;
1124                 case AD_RX_CURRENT:
1125                         // detect loopback situation
1126                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1127                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1128                                 pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
1129                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1130                                        port->slave->dev->master->name, port->slave->dev->name);
1131                                 return;
1132                         }
1133                         __update_selected(lacpdu, port);
1134                         __update_ntt(lacpdu, port);
1135                         __record_pdu(lacpdu, port);
1136                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1137                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1138                         break;
1139                 default:    //to silence the compiler
1140                         break;
1141                 }
1142         }
1143 }
1144
1145 /**
1146  * ad_tx_machine - handle a port's tx state machine
1147  * @port: the port we're looking at
1148  *
1149  */
1150 static void ad_tx_machine(struct port *port)
1151 {
1152         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1153         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1154                 // check if there is something to send
1155                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1156                         __update_lacpdu_from_port(port);
1157
1158                         if (ad_lacpdu_send(port) >= 0) {
1159                                 pr_debug("Sent LACPDU on port %d\n",
1160                                          port->actor_port_number);
1161
1162                                 /* mark ntt as false, so it will not be sent again until
1163                                    demanded */
1164                                 port->ntt = false;
1165                         }
1166                 }
1167                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1168                 port->sm_tx_timer_counter =
1169                         ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1170         }
1171 }
1172
1173 /**
1174  * ad_periodic_machine - handle a port's periodic state machine
1175  * @port: the port we're looking at
1176  *
1177  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1178  */
1179 static void ad_periodic_machine(struct port *port)
1180 {
1181         periodic_states_t last_state;
1182
1183         // keep current state machine state to compare later if it was changed
1184         last_state = port->sm_periodic_state;
1185
1186         // check if port was reinitialized
1187         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1188             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1189            ) {
1190                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1191         }
1192         // check if state machine should change state
1193         else if (port->sm_periodic_timer_counter) {
1194                 // check if periodic state machine expired
1195                 if (!(--port->sm_periodic_timer_counter)) {
1196                         // if expired then do tx
1197                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1198                 } else {
1199                         // If not expired, check if there is some new timeout parameter from the partner state
1200                         switch (port->sm_periodic_state) {
1201                         case AD_FAST_PERIODIC:
1202                                 if (!(port->partner_oper.port_state
1203                                       & AD_STATE_LACP_TIMEOUT))
1204                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1205                                 break;
1206                         case AD_SLOW_PERIODIC:
1207                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1208                                         // stop current timer
1209                                         port->sm_periodic_timer_counter = 0;
1210                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1211                                 }
1212                                 break;
1213                         default:    //to silence the compiler
1214                                 break;
1215                         }
1216                 }
1217         } else {
1218                 switch (port->sm_periodic_state) {
1219                 case AD_NO_PERIODIC:
1220                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1221                         break;
1222                 case AD_PERIODIC_TX:
1223                         if (!(port->partner_oper.port_state
1224                               & AD_STATE_LACP_TIMEOUT))
1225                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1226                         else
1227                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1228                         break;
1229                 default:    //to silence the compiler
1230                         break;
1231                 }
1232         }
1233
1234         // check if the state machine was changed
1235         if (port->sm_periodic_state != last_state) {
1236                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1237                          port->actor_port_number, last_state,
1238                          port->sm_periodic_state);
1239                 switch (port->sm_periodic_state) {
1240                 case AD_NO_PERIODIC:
1241                         port->sm_periodic_timer_counter = 0;       // zero timer
1242                         break;
1243                 case AD_FAST_PERIODIC:
1244                         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
1245                         break;
1246                 case AD_SLOW_PERIODIC:
1247                         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
1248                         break;
1249                 case AD_PERIODIC_TX:
1250                         port->ntt = true;
1251                         break;
1252                 default:    //to silence the compiler
1253                         break;
1254                 }
1255         }
1256 }
1257
1258 /**
1259  * ad_port_selection_logic - select aggregation groups
1260  * @port: the port we're looking at
1261  *
1262  * Select aggregation groups, and assign each port for it's aggregetor. The
1263  * selection logic is called in the inititalization (after all the handshkes),
1264  * and after every lacpdu receive (if selected is off).
1265  */
1266 static void ad_port_selection_logic(struct port *port)
1267 {
1268         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1269         struct port *last_port = NULL, *curr_port;
1270         int found = 0;
1271
1272         // if the port is already Selected, do nothing
1273         if (port->sm_vars & AD_PORT_SELECTED)
1274                 return;
1275
1276         // if the port is connected to other aggregator, detach it
1277         if (port->aggregator) {
1278                 // detach the port from its former aggregator
1279                 temp_aggregator = port->aggregator;
1280                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1281                      last_port = curr_port,
1282                              curr_port = curr_port->next_port_in_aggregator) {
1283                         if (curr_port == port) {
1284                                 temp_aggregator->num_of_ports--;
1285                                 if (!last_port) {// if it is the first port attached to the aggregator
1286                                         temp_aggregator->lag_ports =
1287                                                 port->next_port_in_aggregator;
1288                                 } else {// not the first port attached to the aggregator
1289                                         last_port->next_port_in_aggregator =
1290                                                 port->next_port_in_aggregator;
1291                                 }
1292
1293                                 // clear the port's relations to this aggregator
1294                                 port->aggregator = NULL;
1295                                 port->next_port_in_aggregator = NULL;
1296                                 port->actor_port_aggregator_identifier = 0;
1297
1298                                 pr_debug("Port %d left LAG %d\n",
1299                                          port->actor_port_number,
1300                                          temp_aggregator->aggregator_identifier);
1301                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1302                                 if (!temp_aggregator->lag_ports)
1303                                         ad_clear_agg(temp_aggregator);
1304                                 break;
1305                         }
1306                 }
1307                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1308                         pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1309                                    port->slave->dev->master->name,
1310                                    port->actor_port_number,
1311                                    port->slave->dev->name,
1312                                    port->aggregator->aggregator_identifier);
1313                 }
1314         }
1315         // search on all aggregators for a suitable aggregator for this port
1316         for (aggregator = __get_first_agg(port); aggregator;
1317              aggregator = __get_next_agg(aggregator)) {
1318
1319                 // keep a free aggregator for later use(if needed)
1320                 if (!aggregator->lag_ports) {
1321                         if (!free_aggregator)
1322                                 free_aggregator = aggregator;
1323                         continue;
1324                 }
1325                 // check if current aggregator suits us
1326                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1327                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1328                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1329                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1330                     ) &&
1331                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1332                       !aggregator->is_individual)  // but is not individual OR
1333                     )
1334                    ) {
1335                         // attach to the founded aggregator
1336                         port->aggregator = aggregator;
1337                         port->actor_port_aggregator_identifier =
1338                                 port->aggregator->aggregator_identifier;
1339                         port->next_port_in_aggregator = aggregator->lag_ports;
1340                         port->aggregator->num_of_ports++;
1341                         aggregator->lag_ports = port;
1342                         pr_debug("Port %d joined LAG %d(existing LAG)\n",
1343                                  port->actor_port_number,
1344                                  port->aggregator->aggregator_identifier);
1345
1346                         // mark this port as selected
1347                         port->sm_vars |= AD_PORT_SELECTED;
1348                         found = 1;
1349                         break;
1350                 }
1351         }
1352
1353         // the port couldn't find an aggregator - attach it to a new aggregator
1354         if (!found) {
1355                 if (free_aggregator) {
1356                         // assign port a new aggregator
1357                         port->aggregator = free_aggregator;
1358                         port->actor_port_aggregator_identifier =
1359                                 port->aggregator->aggregator_identifier;
1360
1361                         // update the new aggregator's parameters
1362                         // if port was responsed from the end-user
1363                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1364                                 /* if port is full duplex */
1365                                 port->aggregator->is_individual = false;
1366                         else
1367                                 port->aggregator->is_individual = true;
1368
1369                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1370                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1371                         port->aggregator->partner_system =
1372                                 port->partner_oper.system;
1373                         port->aggregator->partner_system_priority =
1374                                 port->partner_oper.system_priority;
1375                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1376                         port->aggregator->receive_state = 1;
1377                         port->aggregator->transmit_state = 1;
1378                         port->aggregator->lag_ports = port;
1379                         port->aggregator->num_of_ports++;
1380
1381                         // mark this port as selected
1382                         port->sm_vars |= AD_PORT_SELECTED;
1383
1384                         pr_debug("Port %d joined LAG %d(new LAG)\n",
1385                                  port->actor_port_number,
1386                                  port->aggregator->aggregator_identifier);
1387                 } else {
1388                         pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1389                                port->slave->dev->master->name,
1390                                port->actor_port_number, port->slave->dev->name);
1391                 }
1392         }
1393         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1394         // else set ready=FALSE in all aggregator's ports
1395         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1396
1397         aggregator = __get_first_agg(port);
1398         ad_agg_selection_logic(aggregator);
1399 }
1400
1401 /*
1402  * Decide if "agg" is a better choice for the new active aggregator that
1403  * the current best, according to the ad_select policy.
1404  */
1405 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1406                                                 struct aggregator *curr)
1407 {
1408         /*
1409          * 0. If no best, select current.
1410          *
1411          * 1. If the current agg is not individual, and the best is
1412          *    individual, select current.
1413          *
1414          * 2. If current agg is individual and the best is not, keep best.
1415          *
1416          * 3. Therefore, current and best are both individual or both not
1417          *    individual, so:
1418          *
1419          * 3a. If current agg partner replied, and best agg partner did not,
1420          *     select current.
1421          *
1422          * 3b. If current agg partner did not reply and best agg partner
1423          *     did reply, keep best.
1424          *
1425          * 4.  Therefore, current and best both have partner replies or
1426          *     both do not, so perform selection policy:
1427          *
1428          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1429          *     select by bandwidth.
1430          *
1431          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1432          */
1433         if (!best)
1434                 return curr;
1435
1436         if (!curr->is_individual && best->is_individual)
1437                 return curr;
1438
1439         if (curr->is_individual && !best->is_individual)
1440                 return best;
1441
1442         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1443                 return curr;
1444
1445         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1446                 return best;
1447
1448         switch (__get_agg_selection_mode(curr->lag_ports)) {
1449         case BOND_AD_COUNT:
1450                 if (curr->num_of_ports > best->num_of_ports)
1451                         return curr;
1452
1453                 if (curr->num_of_ports < best->num_of_ports)
1454                         return best;
1455
1456                 /*FALLTHROUGH*/
1457         case BOND_AD_STABLE:
1458         case BOND_AD_BANDWIDTH:
1459                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1460                         return curr;
1461
1462                 break;
1463
1464         default:
1465                 pr_warning("%s: Impossible agg select mode %d\n",
1466                            curr->slave->dev->master->name,
1467                            __get_agg_selection_mode(curr->lag_ports));
1468                 break;
1469         }
1470
1471         return best;
1472 }
1473
1474 static int agg_device_up(const struct aggregator *agg)
1475 {
1476         struct port *port = agg->lag_ports;
1477         if (!port)
1478                 return 0;
1479         return (netif_running(port->slave->dev) &&
1480                 netif_carrier_ok(port->slave->dev));
1481 }
1482
1483 /**
1484  * ad_agg_selection_logic - select an aggregation group for a team
1485  * @aggregator: the aggregator we're looking at
1486  *
1487  * It is assumed that only one aggregator may be selected for a team.
1488  *
1489  * The logic of this function is to select the aggregator according to
1490  * the ad_select policy:
1491  *
1492  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1493  * it, and to reselect the active aggregator only if the previous
1494  * aggregator has no more ports related to it.
1495  *
1496  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1497  * bandwidth, and reselect whenever a link state change takes place or the
1498  * set of slaves in the bond changes.
1499  *
1500  * BOND_AD_COUNT: select the aggregator with largest number of ports
1501  * (slaves), and reselect whenever a link state change takes place or the
1502  * set of slaves in the bond changes.
1503  *
1504  * FIXME: this function MUST be called with the first agg in the bond, or
1505  * __get_active_agg() won't work correctly. This function should be better
1506  * called with the bond itself, and retrieve the first agg from it.
1507  */
1508 static void ad_agg_selection_logic(struct aggregator *agg)
1509 {
1510         struct aggregator *best, *active, *origin;
1511         struct port *port;
1512
1513         origin = agg;
1514         active = __get_active_agg(agg);
1515         best = (active && agg_device_up(active)) ? active : NULL;
1516
1517         do {
1518                 agg->is_active = 0;
1519
1520                 if (agg->num_of_ports && agg_device_up(agg))
1521                         best = ad_agg_selection_test(best, agg);
1522
1523         } while ((agg = __get_next_agg(agg)));
1524
1525         if (best &&
1526             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1527                 /*
1528                  * For the STABLE policy, don't replace the old active
1529                  * aggregator if it's still active (it has an answering
1530                  * partner) or if both the best and active don't have an
1531                  * answering partner.
1532                  */
1533                 if (active && active->lag_ports &&
1534                     active->lag_ports->is_enabled &&
1535                     (__agg_has_partner(active) ||
1536                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1537                         if (!(!active->actor_oper_aggregator_key &&
1538                               best->actor_oper_aggregator_key)) {
1539                                 best = NULL;
1540                                 active->is_active = 1;
1541                         }
1542                 }
1543         }
1544
1545         if (best && (best == active)) {
1546                 best = NULL;
1547                 active->is_active = 1;
1548         }
1549
1550         // if there is new best aggregator, activate it
1551         if (best) {
1552                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1553                          best->aggregator_identifier, best->num_of_ports,
1554                          best->actor_oper_aggregator_key,
1555                          best->partner_oper_aggregator_key,
1556                          best->is_individual, best->is_active);
1557                 pr_debug("best ports %p slave %p %s\n",
1558                          best->lag_ports, best->slave,
1559                          best->slave ? best->slave->dev->name : "NULL");
1560
1561                 for (agg = __get_first_agg(best->lag_ports); agg;
1562                      agg = __get_next_agg(agg)) {
1563
1564                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1565                                  agg->aggregator_identifier, agg->num_of_ports,
1566                                  agg->actor_oper_aggregator_key,
1567                                  agg->partner_oper_aggregator_key,
1568                                  agg->is_individual, agg->is_active);
1569                 }
1570
1571                 // check if any partner replys
1572                 if (best->is_individual) {
1573                         pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1574                                    best->slave ? best->slave->dev->master->name : "NULL");
1575                 }
1576
1577                 best->is_active = 1;
1578                 pr_debug("LAG %d chosen as the active LAG\n",
1579                          best->aggregator_identifier);
1580                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1581                          best->aggregator_identifier, best->num_of_ports,
1582                          best->actor_oper_aggregator_key,
1583                          best->partner_oper_aggregator_key,
1584                          best->is_individual, best->is_active);
1585
1586                 // disable the ports that were related to the former active_aggregator
1587                 if (active) {
1588                         for (port = active->lag_ports; port;
1589                              port = port->next_port_in_aggregator) {
1590                                 __disable_port(port);
1591                         }
1592                 }
1593         }
1594
1595         /*
1596          * if the selected aggregator is of join individuals
1597          * (partner_system is NULL), enable their ports
1598          */
1599         active = __get_active_agg(origin);
1600
1601         if (active) {
1602                 if (!__agg_has_partner(active)) {
1603                         for (port = active->lag_ports; port;
1604                              port = port->next_port_in_aggregator) {
1605                                 __enable_port(port);
1606                         }
1607                 }
1608         }
1609
1610         if (origin->slave) {
1611                 struct bonding *bond;
1612
1613                 bond = bond_get_bond_by_slave(origin->slave);
1614                 if (bond)
1615                         bond_3ad_set_carrier(bond);
1616         }
1617 }
1618
1619 /**
1620  * ad_clear_agg - clear a given aggregator's parameters
1621  * @aggregator: the aggregator we're looking at
1622  *
1623  */
1624 static void ad_clear_agg(struct aggregator *aggregator)
1625 {
1626         if (aggregator) {
1627                 aggregator->is_individual = false;
1628                 aggregator->actor_admin_aggregator_key = 0;
1629                 aggregator->actor_oper_aggregator_key = 0;
1630                 aggregator->partner_system = null_mac_addr;
1631                 aggregator->partner_system_priority = 0;
1632                 aggregator->partner_oper_aggregator_key = 0;
1633                 aggregator->receive_state = 0;
1634                 aggregator->transmit_state = 0;
1635                 aggregator->lag_ports = NULL;
1636                 aggregator->is_active = 0;
1637                 aggregator->num_of_ports = 0;
1638                 pr_debug("LAG %d was cleared\n",
1639                          aggregator->aggregator_identifier);
1640         }
1641 }
1642
1643 /**
1644  * ad_initialize_agg - initialize a given aggregator's parameters
1645  * @aggregator: the aggregator we're looking at
1646  *
1647  */
1648 static void ad_initialize_agg(struct aggregator *aggregator)
1649 {
1650         if (aggregator) {
1651                 ad_clear_agg(aggregator);
1652
1653                 aggregator->aggregator_mac_address = null_mac_addr;
1654                 aggregator->aggregator_identifier = 0;
1655                 aggregator->slave = NULL;
1656         }
1657 }
1658
1659 /**
1660  * ad_initialize_port - initialize a given port's parameters
1661  * @aggregator: the aggregator we're looking at
1662  * @lacp_fast: boolean. whether fast periodic should be used
1663  *
1664  */
1665 static void ad_initialize_port(struct port *port, int lacp_fast)
1666 {
1667         static const struct port_params tmpl = {
1668                 .system_priority = 0xffff,
1669                 .key             = 1,
1670                 .port_number     = 1,
1671                 .port_priority   = 0xff,
1672                 .port_state      = 1,
1673         };
1674         static const struct lacpdu lacpdu = {
1675                 .subtype                = 0x01,
1676                 .version_number = 0x01,
1677                 .tlv_type_actor_info = 0x01,
1678                 .actor_information_length = 0x14,
1679                 .tlv_type_partner_info = 0x02,
1680                 .partner_information_length = 0x14,
1681                 .tlv_type_collector_info = 0x03,
1682                 .collector_information_length = 0x10,
1683                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1684         };
1685
1686         if (port) {
1687                 port->actor_port_number = 1;
1688                 port->actor_port_priority = 0xff;
1689                 port->actor_system = null_mac_addr;
1690                 port->actor_system_priority = 0xffff;
1691                 port->actor_port_aggregator_identifier = 0;
1692                 port->ntt = false;
1693                 port->actor_admin_port_key = 1;
1694                 port->actor_oper_port_key  = 1;
1695                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1696                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1697
1698                 if (lacp_fast)
1699                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1700
1701                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1702                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1703
1704                 port->is_enabled = true;
1705                 // ****** private parameters ******
1706                 port->sm_vars = 0x3;
1707                 port->sm_rx_state = 0;
1708                 port->sm_rx_timer_counter = 0;
1709                 port->sm_periodic_state = 0;
1710                 port->sm_periodic_timer_counter = 0;
1711                 port->sm_mux_state = 0;
1712                 port->sm_mux_timer_counter = 0;
1713                 port->sm_tx_state = 0;
1714                 port->sm_tx_timer_counter = 0;
1715                 port->slave = NULL;
1716                 port->aggregator = NULL;
1717                 port->next_port_in_aggregator = NULL;
1718                 port->transaction_id = 0;
1719
1720                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1721         }
1722 }
1723
1724 /**
1725  * ad_enable_collecting_distributing - enable a port's transmit/receive
1726  * @port: the port we're looking at
1727  *
1728  * Enable @port if it's in an active aggregator
1729  */
1730 static void ad_enable_collecting_distributing(struct port *port)
1731 {
1732         if (port->aggregator->is_active) {
1733                 pr_debug("Enabling port %d(LAG %d)\n",
1734                          port->actor_port_number,
1735                          port->aggregator->aggregator_identifier);
1736                 __enable_port(port);
1737         }
1738 }
1739
1740 /**
1741  * ad_disable_collecting_distributing - disable a port's transmit/receive
1742  * @port: the port we're looking at
1743  *
1744  */
1745 static void ad_disable_collecting_distributing(struct port *port)
1746 {
1747         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1748                 pr_debug("Disabling port %d(LAG %d)\n",
1749                          port->actor_port_number,
1750                          port->aggregator->aggregator_identifier);
1751                 __disable_port(port);
1752         }
1753 }
1754
1755 #if 0
1756 /**
1757  * ad_marker_info_send - send a marker information frame
1758  * @port: the port we're looking at
1759  *
1760  * This function does nothing since we decided not to implement send and handle
1761  * response for marker PDU's, in this stage, but only to respond to marker
1762  * information.
1763  */
1764 static void ad_marker_info_send(struct port *port)
1765 {
1766         struct bond_marker marker;
1767         u16 index;
1768
1769         // fill the marker PDU with the appropriate values
1770         marker.subtype = 0x02;
1771         marker.version_number = 0x01;
1772         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1773         marker.marker_length = 0x16;
1774         // convert requester_port to Big Endian
1775         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1776         marker.requester_system = port->actor_system;
1777         // convert requester_port(u32) to Big Endian
1778         marker.requester_transaction_id =
1779                 (((++port->transaction_id & 0xFF) << 24)
1780                  | ((port->transaction_id & 0xFF00) << 8)
1781                  | ((port->transaction_id & 0xFF0000) >> 8)
1782                  | ((port->transaction_id & 0xFF000000) >> 24));
1783         marker.pad = 0;
1784         marker.tlv_type_terminator = 0x00;
1785         marker.terminator_length = 0x00;
1786         for (index = 0; index < 90; index++)
1787                 marker.reserved_90[index] = 0;
1788
1789         // send the marker information
1790         if (ad_marker_send(port, &marker) >= 0) {
1791                 pr_debug("Sent Marker Information on port %d\n",
1792                          port->actor_port_number);
1793         }
1794 }
1795 #endif
1796
1797 /**
1798  * ad_marker_info_received - handle receive of a Marker information frame
1799  * @marker_info: Marker info received
1800  * @port: the port we're looking at
1801  *
1802  */
1803 static void ad_marker_info_received(struct bond_marker *marker_info,
1804         struct port *port)
1805 {
1806         struct bond_marker marker;
1807
1808         // copy the received marker data to the response marker
1809         //marker = *marker_info;
1810         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1811         // change the marker subtype to marker response
1812         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1813         // send the marker response
1814
1815         if (ad_marker_send(port, &marker) >= 0) {
1816                 pr_debug("Sent Marker Response on port %d\n",
1817                          port->actor_port_number);
1818         }
1819 }
1820
1821 /**
1822  * ad_marker_response_received - handle receive of a marker response frame
1823  * @marker: marker PDU received
1824  * @port: the port we're looking at
1825  *
1826  * This function does nothing since we decided not to implement send and handle
1827  * response for marker PDU's, in this stage, but only to respond to marker
1828  * information.
1829  */
1830 static void ad_marker_response_received(struct bond_marker *marker,
1831         struct port *port)
1832 {
1833         marker = NULL; /* just to satisfy the compiler */
1834         port = NULL;  /* just to satisfy the compiler */
1835         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1836 }
1837
1838 //////////////////////////////////////////////////////////////////////////////////////
1839 // ================= AD exported functions to the main bonding code ==================
1840 //////////////////////////////////////////////////////////////////////////////////////
1841
1842 // Check aggregators status in team every T seconds
1843 #define AD_AGGREGATOR_SELECTION_TIMER  8
1844
1845 /*
1846  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1847  *
1848  * Set the aggregation selection timer, to initiate an agg selection in
1849  * the very near future.  Called during first initialization, and during
1850  * any down to up transitions of the bond.
1851  */
1852 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1853 {
1854         BOND_AD_INFO(bond).agg_select_timer = timeout;
1855 }
1856
1857 static u16 aggregator_identifier;
1858
1859 /**
1860  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1861  * @bond: bonding struct to work on
1862  * @tick_resolution: tick duration (millisecond resolution)
1863  *
1864  * Can be called only after the mac address of the bond is set.
1865  */
1866 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1867 {
1868         // check that the bond is not initialized yet
1869         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1870                                 bond->dev->dev_addr)) {
1871
1872                 aggregator_identifier = 0;
1873
1874                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1875                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1876
1877                 // initialize how many times this module is called in one second(should be about every 100ms)
1878                 ad_ticks_per_sec = tick_resolution;
1879
1880                 bond_3ad_initiate_agg_selection(bond,
1881                                                 AD_AGGREGATOR_SELECTION_TIMER *
1882                                                 ad_ticks_per_sec);
1883         }
1884 }
1885
1886 /**
1887  * bond_3ad_bind_slave - initialize a slave's port
1888  * @slave: slave struct to work on
1889  *
1890  * Returns:   0 on success
1891  *          < 0 on error
1892  */
1893 int bond_3ad_bind_slave(struct slave *slave)
1894 {
1895         struct bonding *bond = bond_get_bond_by_slave(slave);
1896         struct port *port;
1897         struct aggregator *aggregator;
1898
1899         if (bond == NULL) {
1900                 pr_err("%s: The slave %s is not attached to its bond\n",
1901                        slave->dev->master->name, slave->dev->name);
1902                 return -1;
1903         }
1904
1905         //check that the slave has not been initialized yet.
1906         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1907
1908                 // port initialization
1909                 port = &(SLAVE_AD_INFO(slave).port);
1910
1911                 ad_initialize_port(port, bond->params.lacp_fast);
1912
1913                 port->slave = slave;
1914                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1915                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1916                 //              ------------------------------------------------------------
1917                 // Port key :   | User key                       |      Speed       |Duplex|
1918                 //              ------------------------------------------------------------
1919                 //              16                               6               1 0
1920                 port->actor_admin_port_key = 0; // initialize this parameter
1921                 port->actor_admin_port_key |= __get_duplex(port);
1922                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1923                 port->actor_oper_port_key = port->actor_admin_port_key;
1924                 // if the port is not full duplex, then the port should be not lacp Enabled
1925                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1926                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1927                 // actor system is the bond's system
1928                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1929                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1930                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1931                 port->aggregator = NULL;
1932                 port->next_port_in_aggregator = NULL;
1933
1934                 __disable_port(port);
1935                 __initialize_port_locks(port);
1936
1937
1938                 // aggregator initialization
1939                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1940
1941                 ad_initialize_agg(aggregator);
1942
1943                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1944                 aggregator->aggregator_identifier = (++aggregator_identifier);
1945                 aggregator->slave = slave;
1946                 aggregator->is_active = 0;
1947                 aggregator->num_of_ports = 0;
1948         }
1949
1950         return 0;
1951 }
1952
1953 /**
1954  * bond_3ad_unbind_slave - deinitialize a slave's port
1955  * @slave: slave struct to work on
1956  *
1957  * Search for the aggregator that is related to this port, remove the
1958  * aggregator and assign another aggregator for other port related to it
1959  * (if any), and remove the port.
1960  */
1961 void bond_3ad_unbind_slave(struct slave *slave)
1962 {
1963         struct port *port, *prev_port, *temp_port;
1964         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1965         int select_new_active_agg = 0;
1966
1967         // find the aggregator related to this slave
1968         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1969
1970         // find the port related to this slave
1971         port = &(SLAVE_AD_INFO(slave).port);
1972
1973         // if slave is null, the whole port is not initialized
1974         if (!port->slave) {
1975                 pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1976                            slave->dev->master->name, slave->dev->name);
1977                 return;
1978         }
1979
1980         pr_debug("Unbinding Link Aggregation Group %d\n",
1981                  aggregator->aggregator_identifier);
1982
1983         /* Tell the partner that this port is not suitable for aggregation */
1984         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1985         __update_lacpdu_from_port(port);
1986         ad_lacpdu_send(port);
1987
1988         // check if this aggregator is occupied
1989         if (aggregator->lag_ports) {
1990                 // check if there are other ports related to this aggregator except
1991                 // the port related to this slave(thats ensure us that there is a
1992                 // reason to search for new aggregator, and that we will find one
1993                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1994                         // find new aggregator for the related port(s)
1995                         new_aggregator = __get_first_agg(port);
1996                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1997                                 // if the new aggregator is empty, or it is connected to our port only
1998                                 if (!new_aggregator->lag_ports
1999                                     || ((new_aggregator->lag_ports == port)
2000                                         && !new_aggregator->lag_ports->next_port_in_aggregator))
2001                                         break;
2002                         }
2003                         // if new aggregator found, copy the aggregator's parameters
2004                         // and connect the related lag_ports to the new aggregator
2005                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2006                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
2007                                          aggregator->aggregator_identifier,
2008                                          new_aggregator->aggregator_identifier);
2009
2010                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
2011                                         pr_info("%s: Removing an active aggregator\n",
2012                                                 aggregator->slave->dev->master->name);
2013                                         // select new active aggregator
2014                                          select_new_active_agg = 1;
2015                                 }
2016
2017                                 new_aggregator->is_individual = aggregator->is_individual;
2018                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2019                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2020                                 new_aggregator->partner_system = aggregator->partner_system;
2021                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2022                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2023                                 new_aggregator->receive_state = aggregator->receive_state;
2024                                 new_aggregator->transmit_state = aggregator->transmit_state;
2025                                 new_aggregator->lag_ports = aggregator->lag_ports;
2026                                 new_aggregator->is_active = aggregator->is_active;
2027                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2028
2029                                 // update the information that is written on the ports about the aggregator
2030                                 for (temp_port = aggregator->lag_ports; temp_port;
2031                                      temp_port = temp_port->next_port_in_aggregator) {
2032                                         temp_port->aggregator = new_aggregator;
2033                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2034                                 }
2035
2036                                 // clear the aggregator
2037                                 ad_clear_agg(aggregator);
2038
2039                                 if (select_new_active_agg)
2040                                         ad_agg_selection_logic(__get_first_agg(port));
2041                         } else {
2042                                 pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
2043                                            slave->dev->master->name);
2044                         }
2045                 } else { // in case that the only port related to this aggregator is the one we want to remove
2046                         select_new_active_agg = aggregator->is_active;
2047                         // clear the aggregator
2048                         ad_clear_agg(aggregator);
2049                         if (select_new_active_agg) {
2050                                 pr_info("%s: Removing an active aggregator\n",
2051                                         slave->dev->master->name);
2052                                 // select new active aggregator
2053                                 ad_agg_selection_logic(__get_first_agg(port));
2054                         }
2055                 }
2056         }
2057
2058         pr_debug("Unbinding port %d\n", port->actor_port_number);
2059         // find the aggregator that this port is connected to
2060         temp_aggregator = __get_first_agg(port);
2061         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2062                 prev_port = NULL;
2063                 // search the port in the aggregator's related ports
2064                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2065                      prev_port = temp_port,
2066                              temp_port = temp_port->next_port_in_aggregator) {
2067                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2068                                 if (prev_port)
2069                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2070                                 else
2071                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2072                                 temp_aggregator->num_of_ports--;
2073                                 if (temp_aggregator->num_of_ports == 0) {
2074                                         select_new_active_agg = temp_aggregator->is_active;
2075                                         // clear the aggregator
2076                                         ad_clear_agg(temp_aggregator);
2077                                         if (select_new_active_agg) {
2078                                                 pr_info("%s: Removing an active aggregator\n",
2079                                                         slave->dev->master->name);
2080                                                 // select new active aggregator
2081                                                 ad_agg_selection_logic(__get_first_agg(port));
2082                                         }
2083                                 }
2084                                 break;
2085                         }
2086                 }
2087         }
2088         port->slave = NULL;
2089 }
2090
2091 /**
2092  * bond_3ad_state_machine_handler - handle state machines timeout
2093  * @bond: bonding struct to work on
2094  *
2095  * The state machine handling concept in this module is to check every tick
2096  * which state machine should operate any function. The execution order is
2097  * round robin, so when we have an interaction between state machines, the
2098  * reply of one to each other might be delayed until next tick.
2099  *
2100  * This function also complete the initialization when the agg_select_timer
2101  * times out, and it selects an aggregator for the ports that are yet not
2102  * related to any aggregator, and selects the active aggregator for a bond.
2103  */
2104 void bond_3ad_state_machine_handler(struct work_struct *work)
2105 {
2106         struct bonding *bond = container_of(work, struct bonding,
2107                                             ad_work.work);
2108         struct port *port;
2109         struct aggregator *aggregator;
2110
2111         read_lock(&bond->lock);
2112
2113         if (bond->kill_timers)
2114                 goto out;
2115
2116         //check if there are any slaves
2117         if (bond->slave_cnt == 0)
2118                 goto re_arm;
2119
2120         // check if agg_select_timer timer after initialize is timed out
2121         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2122                 // select the active aggregator for the bond
2123                 if ((port = __get_first_port(bond))) {
2124                         if (!port->slave) {
2125                                 pr_warning("%s: Warning: bond's first port is uninitialized\n",
2126                                            bond->dev->name);
2127                                 goto re_arm;
2128                         }
2129
2130                         aggregator = __get_first_agg(port);
2131                         ad_agg_selection_logic(aggregator);
2132                 }
2133                 bond_3ad_set_carrier(bond);
2134         }
2135
2136         // for each port run the state machines
2137         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2138                 if (!port->slave) {
2139                         pr_warning("%s: Warning: Found an uninitialized port\n",
2140                                    bond->dev->name);
2141                         goto re_arm;
2142                 }
2143
2144                 /* Lock around state machines to protect data accessed
2145                  * by all (e.g., port->sm_vars).  ad_rx_machine may run
2146                  * concurrently due to incoming LACPDU.
2147                  */
2148                 __get_state_machine_lock(port);
2149
2150                 ad_rx_machine(NULL, port);
2151                 ad_periodic_machine(port);
2152                 ad_port_selection_logic(port);
2153                 ad_mux_machine(port);
2154                 ad_tx_machine(port);
2155
2156                 // turn off the BEGIN bit, since we already handled it
2157                 if (port->sm_vars & AD_PORT_BEGIN)
2158                         port->sm_vars &= ~AD_PORT_BEGIN;
2159
2160                 __release_state_machine_lock(port);
2161         }
2162
2163 re_arm:
2164         if (!bond->kill_timers)
2165                 queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2166 out:
2167         read_unlock(&bond->lock);
2168 }
2169
2170 /**
2171  * bond_3ad_rx_indication - handle a received frame
2172  * @lacpdu: received lacpdu
2173  * @slave: slave struct to work on
2174  * @length: length of the data received
2175  *
2176  * It is assumed that frames that were sent on this NIC don't returned as new
2177  * received frames (loopback). Since only the payload is given to this
2178  * function, it check for loopback.
2179  */
2180 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2181 {
2182         struct port *port;
2183
2184         if (length >= sizeof(struct lacpdu)) {
2185
2186                 port = &(SLAVE_AD_INFO(slave).port);
2187
2188                 if (!port->slave) {
2189                         pr_warning("%s: Warning: port of slave %s is uninitialized\n",
2190                                    slave->dev->name, slave->dev->master->name);
2191                         return;
2192                 }
2193
2194                 switch (lacpdu->subtype) {
2195                 case AD_TYPE_LACPDU:
2196                         pr_debug("Received LACPDU on port %d\n",
2197                                  port->actor_port_number);
2198                         /* Protect against concurrent state machines */
2199                         __get_state_machine_lock(port);
2200                         ad_rx_machine(lacpdu, port);
2201                         __release_state_machine_lock(port);
2202                         break;
2203
2204                 case AD_TYPE_MARKER:
2205                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2206
2207                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2208                         case AD_MARKER_INFORMATION_SUBTYPE:
2209                                 pr_debug("Received Marker Information on port %d\n",
2210                                          port->actor_port_number);
2211                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2212                                 break;
2213
2214                         case AD_MARKER_RESPONSE_SUBTYPE:
2215                                 pr_debug("Received Marker Response on port %d\n",
2216                                          port->actor_port_number);
2217                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2218                                 break;
2219
2220                         default:
2221                                 pr_debug("Received an unknown Marker subtype on slot %d\n",
2222                                          port->actor_port_number);
2223                         }
2224                 }
2225         }
2226 }
2227
2228 /**
2229  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2230  * @slave: slave struct to work on
2231  *
2232  * Handle reselection of aggregator (if needed) for this port.
2233  */
2234 void bond_3ad_adapter_speed_changed(struct slave *slave)
2235 {
2236         struct port *port;
2237
2238         port = &(SLAVE_AD_INFO(slave).port);
2239
2240         // if slave is null, the whole port is not initialized
2241         if (!port->slave) {
2242                 pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
2243                            slave->dev->master->name, slave->dev->name);
2244                 return;
2245         }
2246
2247         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2248         port->actor_oper_port_key = port->actor_admin_port_key |=
2249                 (__get_link_speed(port) << 1);
2250         pr_debug("Port %d changed speed\n", port->actor_port_number);
2251         // there is no need to reselect a new aggregator, just signal the
2252         // state machines to reinitialize
2253         port->sm_vars |= AD_PORT_BEGIN;
2254 }
2255
2256 /**
2257  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2258  * @slave: slave struct to work on
2259  *
2260  * Handle reselection of aggregator (if needed) for this port.
2261  */
2262 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2263 {
2264         struct port *port;
2265
2266         port = &(SLAVE_AD_INFO(slave).port);
2267
2268         // if slave is null, the whole port is not initialized
2269         if (!port->slave) {
2270                 pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
2271                            slave->dev->master->name, slave->dev->name);
2272                 return;
2273         }
2274
2275         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2276         port->actor_oper_port_key = port->actor_admin_port_key |=
2277                 __get_duplex(port);
2278         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2279         // there is no need to reselect a new aggregator, just signal the
2280         // state machines to reinitialize
2281         port->sm_vars |= AD_PORT_BEGIN;
2282 }
2283
2284 /**
2285  * bond_3ad_handle_link_change - handle a slave's link status change indication
2286  * @slave: slave struct to work on
2287  * @status: whether the link is now up or down
2288  *
2289  * Handle reselection of aggregator (if needed) for this port.
2290  */
2291 void bond_3ad_handle_link_change(struct slave *slave, char link)
2292 {
2293         struct port *port;
2294
2295         port = &(SLAVE_AD_INFO(slave).port);
2296
2297         // if slave is null, the whole port is not initialized
2298         if (!port->slave) {
2299                 pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
2300                            slave->dev->master->name, slave->dev->name);
2301                 return;
2302         }
2303
2304         // 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)
2305         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2306         if (link == BOND_LINK_UP) {
2307                 port->is_enabled = true;
2308                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2309                 port->actor_oper_port_key = port->actor_admin_port_key |=
2310                         __get_duplex(port);
2311                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2312                 port->actor_oper_port_key = port->actor_admin_port_key |=
2313                         (__get_link_speed(port) << 1);
2314         } else {
2315                 /* link has failed */
2316                 port->is_enabled = false;
2317                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2318                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2319                                              ~AD_SPEED_KEY_BITS);
2320         }
2321         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2322         // there is no need to reselect a new aggregator, just signal the
2323         // state machines to reinitialize
2324         port->sm_vars |= AD_PORT_BEGIN;
2325 }
2326
2327 /*
2328  * set link state for bonding master: if we have an active
2329  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2330  * have an active aggregator if there are no slaves with link up.
2331  *
2332  * This behavior complies with IEEE 802.3 section 43.3.9.
2333  *
2334  * Called by bond_set_carrier(). Return zero if carrier state does not
2335  * change, nonzero if it does.
2336  */
2337 int bond_3ad_set_carrier(struct bonding *bond)
2338 {
2339         struct aggregator *active;
2340
2341         active = __get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator));
2342         if (active) {
2343                 /* are enough slaves available to consider link up? */
2344                 if (active->num_of_ports < bond->params.min_links) {
2345                         if (netif_carrier_ok(bond->dev)) {
2346                                 netif_carrier_off(bond->dev);
2347                                 return 1;
2348                         }
2349                 } else if (!netif_carrier_ok(bond->dev)) {
2350                         netif_carrier_on(bond->dev);
2351                         return 1;
2352                 }
2353                 return 0;
2354         }
2355
2356         if (netif_carrier_ok(bond->dev)) {
2357                 netif_carrier_off(bond->dev);
2358                 return 1;
2359         }
2360         return 0;
2361 }
2362
2363 /**
2364  * bond_3ad_get_active_agg_info - get information of the active aggregator
2365  * @bond: bonding struct to work on
2366  * @ad_info: ad_info struct to fill with the bond's info
2367  *
2368  * Returns:   0 on success
2369  *          < 0 on error
2370  */
2371 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2372 {
2373         struct aggregator *aggregator = NULL;
2374         struct port *port;
2375
2376         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2377                 if (port->aggregator && port->aggregator->is_active) {
2378                         aggregator = port->aggregator;
2379                         break;
2380                 }
2381         }
2382
2383         if (aggregator) {
2384                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2385                 ad_info->ports = aggregator->num_of_ports;
2386                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2387                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2388                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2389                 return 0;
2390         }
2391
2392         return -1;
2393 }
2394
2395 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2396 {
2397         struct slave *slave, *start_at;
2398         struct bonding *bond = netdev_priv(dev);
2399         int slave_agg_no;
2400         int slaves_in_agg;
2401         int agg_id;
2402         int i;
2403         struct ad_info ad_info;
2404         int res = 1;
2405
2406         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2407                 pr_debug("%s: Error: bond_3ad_get_active_agg_info failed\n",
2408                          dev->name);
2409                 goto out;
2410         }
2411
2412         slaves_in_agg = ad_info.ports;
2413         agg_id = ad_info.aggregator_id;
2414
2415         if (slaves_in_agg == 0) {
2416                 /*the aggregator is empty*/
2417                 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2418                 goto out;
2419         }
2420
2421         slave_agg_no = bond->xmit_hash_policy(skb, slaves_in_agg);
2422
2423         bond_for_each_slave(bond, slave, i) {
2424                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2425
2426                 if (agg && (agg->aggregator_identifier == agg_id)) {
2427                         slave_agg_no--;
2428                         if (slave_agg_no < 0)
2429                                 break;
2430                 }
2431         }
2432
2433         if (slave_agg_no >= 0) {
2434                 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2435                        dev->name, agg_id);
2436                 goto out;
2437         }
2438
2439         start_at = slave;
2440
2441         bond_for_each_slave_from(bond, slave, i, start_at) {
2442                 int slave_agg_id = 0;
2443                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2444
2445                 if (agg)
2446                         slave_agg_id = agg->aggregator_identifier;
2447
2448                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2449                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2450                         break;
2451                 }
2452         }
2453
2454 out:
2455         if (res) {
2456                 /* no suitable interface, frame not sent */
2457                 dev_kfree_skb(skb);
2458         }
2459
2460         return NETDEV_TX_OK;
2461 }
2462
2463 void bond_3ad_lacpdu_recv(struct sk_buff *skb, struct bonding *bond,
2464                           struct slave *slave)
2465 {
2466         if (skb->protocol != PKT_TYPE_LACPDU)
2467                 return;
2468
2469         if (!pskb_may_pull(skb, sizeof(struct lacpdu)))
2470                 return;
2471
2472         read_lock(&bond->lock);
2473         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2474         read_unlock(&bond->lock);
2475 }
2476
2477 /*
2478  * When modify lacp_rate parameter via sysfs,
2479  * update actor_oper_port_state of each port.
2480  *
2481  * Hold slave->state_machine_lock,
2482  * so we can modify port->actor_oper_port_state,
2483  * no matter bond is up or down.
2484  */
2485 void bond_3ad_update_lacp_rate(struct bonding *bond)
2486 {
2487         int i;
2488         struct slave *slave;
2489         struct port *port = NULL;
2490         int lacp_fast;
2491
2492         read_lock(&bond->lock);
2493         lacp_fast = bond->params.lacp_fast;
2494
2495         bond_for_each_slave(bond, slave, i) {
2496                 port = &(SLAVE_AD_INFO(slave).port);
2497                 __get_state_machine_lock(port);
2498                 if (lacp_fast)
2499                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2500                 else
2501                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2502                 __release_state_machine_lock(port);
2503         }
2504
2505         read_unlock(&bond->lock);
2506 }