drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #include <linux/skbuff.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/if_bonding.h>
  30 #include <linux/pkt_sched.h>
  31 #include <net/net_namespace.h>
  32 #include "bonding.h"
  33 #include "bond_3ad.h"
  34
  35 // General definitions
  36 #define AD_SHORT_TIMEOUT           1
  37 #define AD_LONG_TIMEOUT            0
  38 #define AD_STANDBY                 0x2
  39 #define AD_MAX_TX_IN_SECOND        3
  40 #define AD_COLLECTOR_MAX_DELAY     0
  41
  42 // Timer definitions(43.4.4 in the 802.3ad standard)
  43 #define AD_FAST_PERIODIC_TIME      1
  44 #define AD_SLOW_PERIODIC_TIME      30
  45 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  46 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  47 #define AD_CHURN_DETECTION_TIME    60
  48 #define AD_AGGREGATE_WAIT_TIME     2
  49
  50 // Port state definitions(43.4.2.2 in the 802.3ad standard)
  51 #define AD_STATE_LACP_ACTIVITY   0x1
  52 #define AD_STATE_LACP_TIMEOUT    0x2
  53 #define AD_STATE_AGGREGATION     0x4
  54 #define AD_STATE_SYNCHRONIZATION 0x8
  55 #define AD_STATE_COLLECTING      0x10
  56 #define AD_STATE_DISTRIBUTING    0x20
  57 #define AD_STATE_DEFAULTED       0x40
  58 #define AD_STATE_EXPIRED         0x80
  59
  60 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
  61 #define AD_PORT_BEGIN           0x1
  62 #define AD_PORT_LACP_ENABLED    0x2
  63 #define AD_PORT_ACTOR_CHURN     0x4
  64 #define AD_PORT_PARTNER_CHURN   0x8
  65 #define AD_PORT_READY           0x10
  66 #define AD_PORT_READY_N         0x20
  67 #define AD_PORT_MATCHED         0x40
  68 #define AD_PORT_STANDBY         0x80
  69 #define AD_PORT_SELECTED        0x100
  70 #define AD_PORT_MOVED           0x200
  71
  72 // Port Key definitions
  73 // key is determined according to the link speed, duplex and
  74 // user key(which is yet not supported)
  75 //              ------------------------------------------------------------
  76 // Port key :   | User key                       |      Speed       |Duplex|
  77 //              ------------------------------------------------------------
  78 //              16                               6               1 0
  79 #define  AD_DUPLEX_KEY_BITS    0x1
  80 #define  AD_SPEED_KEY_BITS     0x3E
  81 #define  AD_USER_KEY_BITS      0xFFC0
  82
  83 //dalloun
  84 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  85 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  86 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  87 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  88 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  89 //endalloun
  90
  91 // compare MAC addresses
  92 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  93
  94 static struct mac_addr null_mac_addr = {{0, 0, 0, 0, 0, 0}};
  95 static u16 ad_ticks_per_sec;
  96 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  97
  98 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
  99
 100 // ================= main 802.3ad protocol functions ==================
 101 static int ad_lacpdu_send(struct port *port);
 102 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 103 static void ad_mux_machine(struct port *port);
 104 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 105 static void ad_tx_machine(struct port *port);
 106 static void ad_periodic_machine(struct port *port);
 107 static void ad_port_selection_logic(struct port *port);
 108 static void ad_agg_selection_logic(struct aggregator *aggregator);
 109 static void ad_clear_agg(struct aggregator *aggregator);
 110 static void ad_initialize_agg(struct aggregator *aggregator);
 111 static void ad_initialize_port(struct port *port, int lacp_fast);
 112 static void ad_enable_collecting_distributing(struct port *port);
 113 static void ad_disable_collecting_distributing(struct port *port);
 114 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 115 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 116
 117
 118 /////////////////////////////////////////////////////////////////////////////////
 119 // ================= api to bonding and kernel code ==================
 120 /////////////////////////////////////////////////////////////////////////////////
 121
 122 /**
 123  * __get_bond_by_port - get the port's bonding struct
 124  * @port: the port we're looking at
 125  *
 126  * Return @port's bonding struct, or %NULL if it can't be found.
 127  */
 128 static inline struct bonding *__get_bond_by_port(struct port *port)
 129 {
 130         if (port->slave == NULL) {
 131                 return NULL;
 132         }
 133
 134         return bond_get_bond_by_slave(port->slave);
 135 }
 136
 137 /**
 138  * __get_first_port - get the first port in the bond
 139  * @bond: the bond we're looking at
 140  *
 141  * Return the port of the first slave in @bond, or %NULL if it can't be found.
 142  */
 143 static inline struct port *__get_first_port(struct bonding *bond)
 144 {
 145         if (bond->slave_cnt == 0) {
 146                 return NULL;
 147         }
 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
 169         return &(SLAVE_AD_INFO(slave->next).port);
 170 }
 171
 172 /**
 173  * __get_first_agg - get the first aggregator in the bond
 174  * @bond: the bond we're looking at
 175  *
 176  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 177  * found.
 178  */
 179 static inline struct aggregator *__get_first_agg(struct port *port)
 180 {
 181         struct bonding *bond = __get_bond_by_port(port);
 182
 183         // If there's no bond for this port, or bond has no slaves
 184         if ((bond == NULL) || (bond->slave_cnt == 0)) {
 185                 return NULL;
 186         }
 187
 188         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
 189 }
 190
 191 /**
 192  * __get_next_agg - get the next aggregator in the bond
 193  * @aggregator: the aggregator we're looking at
 194  *
 195  * Return the aggregator of the slave that is next in line of @aggregator's
 196  * slave in the bond, or %NULL if it can't be found.
 197  */
 198 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
 199 {
 200         struct slave *slave = aggregator->slave;
 201         struct bonding *bond = bond_get_bond_by_slave(slave);
 202
 203         // If there's no bond for this aggregator, or this is the last slave
 204         if ((bond == NULL) || (slave->next == bond->first_slave)) {
 205                 return NULL;
 206         }
 207
 208         return &(SLAVE_AD_INFO(slave->next).aggregator);
 209 }
 210
 211 /*
 212  * __agg_has_partner
 213  *
 214  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 215  * address for the partner).  Return 0 if not.
 216  */
 217 static inline int __agg_has_partner(struct aggregator *agg)
 218 {
 219         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 220 }
 221
 222 /**
 223  * __disable_port - disable the port's slave
 224  * @port: the port we're looking at
 225  *
 226  */
 227 static inline void __disable_port(struct port *port)
 228 {
 229         bond_set_slave_inactive_flags(port->slave);
 230 }
 231
 232 /**
 233  * __enable_port - enable the port's slave, if it's up
 234  * @port: the port we're looking at
 235  *
 236  */
 237 static inline void __enable_port(struct port *port)
 238 {
 239         struct slave *slave = port->slave;
 240
 241         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev)) {
 242                 bond_set_slave_active_flags(slave);
 243         }
 244 }
 245
 246 /**
 247  * __port_is_enabled - check if the port's slave is in active state
 248  * @port: the port we're looking at
 249  *
 250  */
 251 static inline int __port_is_enabled(struct port *port)
 252 {
 253         return(port->slave->state == BOND_STATE_ACTIVE);
 254 }
 255
 256 /**
 257  * __get_agg_selection_mode - get the aggregator selection mode
 258  * @port: the port we're looking at
 259  *
 260  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 261  */
 262 static inline u32 __get_agg_selection_mode(struct port *port)
 263 {
 264         struct bonding *bond = __get_bond_by_port(port);
 265
 266         if (bond == NULL) {
 267                 return BOND_AD_STABLE;
 268         }
 269
 270         return BOND_AD_INFO(bond).agg_select_mode;
 271 }
 272
 273 /**
 274  * __check_agg_selection_timer - check if the selection timer has expired
 275  * @port: the port we're looking at
 276  *
 277  */
 278 static inline int __check_agg_selection_timer(struct port *port)
 279 {
 280         struct bonding *bond = __get_bond_by_port(port);
 281
 282         if (bond == NULL) {
 283                 return 0;
 284         }
 285
 286         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 287 }
 288
 289 /**
 290  * __get_rx_machine_lock - lock the port's RX machine
 291  * @port: the port we're looking at
 292  *
 293  */
 294 static inline void __get_rx_machine_lock(struct port *port)
 295 {
 296         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 297 }
 298
 299 /**
 300  * __release_rx_machine_lock - unlock the port's RX machine
 301  * @port: the port we're looking at
 302  *
 303  */
 304 static inline void __release_rx_machine_lock(struct port *port)
 305 {
 306         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 307 }
 308
 309 /**
 310  * __get_link_speed - get a port's speed
 311  * @port: the port we're looking at
 312  *
 313  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 314  *     0,
 315  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 316  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 317  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 318  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 319  */
 320 static u16 __get_link_speed(struct port *port)
 321 {
 322         struct slave *slave = port->slave;
 323         u16 speed;
 324
 325         /* this if covers only a special case: when the configuration starts with
 326          * link down, it sets the speed to 0.
 327          * This is done in spite of the fact that the e100 driver reports 0 to be
 328          * compatible with MVT in the future.*/
 329         if (slave->link != BOND_LINK_UP) {
 330                 speed=0;
 331         } else {
 332                 switch (slave->speed) {
 333                 case SPEED_10:
 334                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 335                         break;
 336
 337                 case SPEED_100:
 338                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 339                         break;
 340
 341                 case SPEED_1000:
 342                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 343                         break;
 344
 345                 case SPEED_10000:
 346                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 347                         break;
 348
 349                 default:
 350                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 351                         break;
 352                 }
 353         }
 354
 355         pr_debug("Port %d Received link speed %d update from adapter\n", port->actor_port_number, speed);
 356         return speed;
 357 }
 358
 359 /**
 360  * __get_duplex - get a port's duplex
 361  * @port: the port we're looking at
 362  *
 363  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 364  *     0x01 if in full duplex
 365  *     0x00 otherwise
 366  */
 367 static u8 __get_duplex(struct port *port)
 368 {
 369         struct slave *slave = port->slave;
 370
 371         u8 retval;
 372
 373         //  handling a special case: when the configuration starts with
 374         // link down, it sets the duplex to 0.
 375         if (slave->link != BOND_LINK_UP) {
 376                 retval=0x0;
 377         } else {
 378                 switch (slave->duplex) {
 379                 case DUPLEX_FULL:
 380                         retval=0x1;
 381                         pr_debug("Port %d Received status full duplex update from adapter\n", port->actor_port_number);
 382                         break;
 383                 case DUPLEX_HALF:
 384                 default:
 385                         retval=0x0;
 386                         pr_debug("Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number);
 387                         break;
 388                 }
 389         }
 390         return retval;
 391 }
 392
 393 /**
 394  * __initialize_port_locks - initialize a port's RX machine spinlock
 395  * @port: the port we're looking at
 396  *
 397  */
 398 static inline void __initialize_port_locks(struct port *port)
 399 {
 400         // make sure it isn't called twice
 401         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 402 }
 403
 404 //conversions
 405
 406 /**
 407  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 408  * @timer_type: which timer to operate
 409  * @par: timer parameter. see below
 410  *
 411  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 412  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 413  *                                                  %SLOW_PERIODIC_TIME.
 414  */
 415 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 416 {
 417         u16 retval=0;    //to silence the compiler
 418
 419         switch (timer_type) {
 420         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 421                 if (par) {            // for short or long timeout
 422                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 423                 } else {
 424                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 425                 }
 426                 break;
 427         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 428                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 429                 break;
 430         case AD_PERIODIC_TIMER:     // for periodic machine
 431                 retval = (par*ad_ticks_per_sec); // long timeout
 432                 break;
 433         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 434                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 435                 break;
 436         case AD_WAIT_WHILE_TIMER:           // for selection machine
 437                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 438                 break;
 439         }
 440         return retval;
 441 }
 442
 443
 444 /////////////////////////////////////////////////////////////////////////////////
 445 // ================= ad_rx_machine helper functions ==================
 446 /////////////////////////////////////////////////////////////////////////////////
 447
 448 /**
 449  * __choose_matched - update a port's matched variable from a received lacpdu
 450  * @lacpdu: the lacpdu we've received
 451  * @port: the port we're looking at
 452  *
 453  * Update the value of the matched variable, using parameter values from a
 454  * newly received lacpdu. Parameter values for the partner carried in the
 455  * received PDU are compared with the corresponding operational parameter
 456  * values for the actor. Matched is set to TRUE if all of these parameters
 457  * match and the PDU parameter partner_state.aggregation has the same value as
 458  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 459  * in the aggregation. Matched is also set to TRUE if the value of
 460  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 461  * an individual link and lacp will actively maintain the link. Otherwise,
 462  * matched is set to FALSE. LACP is considered to be actively maintaining the
 463  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 464  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 465  * partner_state.lacp_activity variables are TRUE.
 466  *
 467  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 468  * used here to implement the language from 802.3ad 43.4.9 that requires
 469  * recordPDU to "match" the LACPDU parameters to the stored values.
 470  */
 471 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 472 {
 473         // check if all parameters are alike
 474         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 475              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 476              !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 477              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 478              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 479              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 480             // or this is individual link(aggregation == FALSE)
 481             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 482                 ) {
 483                 // update the state machine Matched variable
 484                 port->sm_vars |= AD_PORT_MATCHED;
 485         } else {
 486                 port->sm_vars &= ~AD_PORT_MATCHED;
 487         }
 488 }
 489
 490 /**
 491  * __record_pdu - record parameters from a received lacpdu
 492  * @lacpdu: the lacpdu we've received
 493  * @port: the port we're looking at
 494  *
 495  * Record the parameter values for the Actor carried in a received lacpdu as
 496  * the current partner operational parameter values and sets
 497  * actor_oper_port_state.defaulted to FALSE.
 498  */
 499 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 500 {
 501         if (lacpdu && port) {
 502                 struct port_params *partner = &port->partner_oper;
 503
 504                 __choose_matched(lacpdu, port);
 505                 // record the new parameter values for the partner operational
 506                 partner->port_number = ntohs(lacpdu->actor_port);
 507                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 508                 partner->system = lacpdu->actor_system;
 509                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 510                 partner->key = ntohs(lacpdu->actor_key);
 511                 partner->port_state = lacpdu->actor_state;
 512
 513                 // set actor_oper_port_state.defaulted to FALSE
 514                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 515
 516                 // set the partner sync. to on if the partner is sync. and the port is matched
 517                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 518                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 519                 } else {
 520                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 521                 }
 522         }
 523 }
 524
 525 /**
 526  * __record_default - record default parameters
 527  * @port: the port we're looking at
 528  *
 529  * This function records the default parameter values for the partner carried
 530  * in the Partner Admin parameters as the current partner operational parameter
 531  * values and sets actor_oper_port_state.defaulted to TRUE.
 532  */
 533 static void __record_default(struct port *port)
 534 {
 535         if (port) {
 536                 // record the partner admin parameters
 537                 memcpy(&port->partner_oper, &port->partner_admin,
 538                        sizeof(struct port_params));
 539
 540                 // set actor_oper_port_state.defaulted to true
 541                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 542         }
 543 }
 544
 545 /**
 546  * __update_selected - update a port's Selected variable from a received lacpdu
 547  * @lacpdu: the lacpdu we've received
 548  * @port: the port we're looking at
 549  *
 550  * Update the value of the selected variable, using parameter values from a
 551  * newly received lacpdu. The parameter values for the Actor carried in the
 552  * received PDU are compared with the corresponding operational parameter
 553  * values for the ports partner. If one or more of the comparisons shows that
 554  * the value(s) received in the PDU differ from the current operational values,
 555  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 556  * set to out_of_sync. Otherwise, selected remains unchanged.
 557  */
 558 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 559 {
 560         if (lacpdu && port) {
 561                 const struct port_params *partner = &port->partner_oper;
 562
 563                 // check if any parameter is different
 564                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 565                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 566                     MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system) ||
 567                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 568                     ntohs(lacpdu->actor_key) != partner->key ||
 569                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 570                         // update the state machine Selected variable
 571                         port->sm_vars &= ~AD_PORT_SELECTED;
 572                 }
 573         }
 574 }
 575
 576 /**
 577  * __update_default_selected - update a port's Selected variable from Partner
 578  * @port: the port we're looking at
 579  *
 580  * This function updates the value of the selected variable, using the partner
 581  * administrative parameter values. The administrative values are compared with
 582  * the corresponding operational parameter values for the partner. If one or
 583  * more of the comparisons shows that the administrative value(s) differ from
 584  * the current operational values, then Selected is set to FALSE and
 585  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 586  * Selected remains unchanged.
 587  */
 588 static void __update_default_selected(struct port *port)
 589 {
 590         if (port) {
 591                 const struct port_params *admin = &port->partner_admin;
 592                 const struct port_params *oper = &port->partner_oper;
 593
 594                 // check if any parameter is different
 595                 if (admin->port_number != oper->port_number ||
 596                     admin->port_priority != oper->port_priority ||
 597                     MAC_ADDRESS_COMPARE(&admin->system, &oper->system) ||
 598                     admin->system_priority != oper->system_priority ||
 599                     admin->key != oper->key ||
 600                     (admin->port_state & AD_STATE_AGGREGATION)
 601                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 602                         // update the state machine Selected variable
 603                         port->sm_vars &= ~AD_PORT_SELECTED;
 604                 }
 605         }
 606 }
 607
 608 /**
 609  * __update_ntt - update a port's ntt variable from a received lacpdu
 610  * @lacpdu: the lacpdu we've received
 611  * @port: the port we're looking at
 612  *
 613  * Updates the value of the ntt variable, using parameter values from a newly
 614  * received lacpdu. The parameter values for the partner carried in the
 615  * received PDU are compared with the corresponding operational parameter
 616  * values for the Actor. If one or more of the comparisons shows that the
 617  * value(s) received in the PDU differ from the current operational values,
 618  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 619  */
 620 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 621 {
 622         // validate lacpdu and port
 623         if (lacpdu && port) {
 624                 // check if any parameter is different
 625                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 626                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 627                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 628                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 629                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 630                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 631                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 632                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 633                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 634                    ) {
 635
 636                         port->ntt = true;
 637                 }
 638         }
 639 }
 640
 641 /**
 642  * __attach_bond_to_agg
 643  * @port: the port we're looking at
 644  *
 645  * Handle the attaching of the port's control parser/multiplexer and the
 646  * aggregator. This function does nothing since the parser/multiplexer of the
 647  * receive and the parser/multiplexer of the aggregator are already combined.
 648  */
 649 static void __attach_bond_to_agg(struct port *port)
 650 {
 651         port=NULL; // just to satisfy the compiler
 652         // This function does nothing since the parser/multiplexer of the receive
 653         // and the parser/multiplexer of the aggregator are already combined
 654 }
 655
 656 /**
 657  * __detach_bond_from_agg
 658  * @port: the port we're looking at
 659  *
 660  * Handle the detaching of the port's control parser/multiplexer from the
 661  * aggregator. This function does nothing since the parser/multiplexer of the
 662  * receive and the parser/multiplexer of the aggregator are already combined.
 663  */
 664 static void __detach_bond_from_agg(struct port *port)
 665 {
 666         port=NULL; // just to satisfy the compiler
 667         // This function does nothing sience the parser/multiplexer of the receive
 668         // and the parser/multiplexer of the aggregator are already combined
 669 }
 670
 671 /**
 672  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 673  * @aggregator: the aggregator we're looking at
 674  *
 675  */
 676 static int __agg_ports_are_ready(struct aggregator *aggregator)
 677 {
 678         struct port *port;
 679         int retval = 1;
 680
 681         if (aggregator) {
 682                 // scan all ports in this aggregator to verfy if they are all ready
 683                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 684                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 685                                 retval = 0;
 686                                 break;
 687                         }
 688                 }
 689         }
 690
 691         return retval;
 692 }
 693
 694 /**
 695  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 696  * @aggregator: the aggregator we're looking at
 697  * @val: Should the ports' ready bit be set on or off
 698  *
 699  */
 700 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 701 {
 702         struct port *port;
 703
 704         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
 705                 if (val) {
 706                         port->sm_vars |= AD_PORT_READY;
 707                 } else {
 708                         port->sm_vars &= ~AD_PORT_READY;
 709                 }
 710         }
 711 }
 712
 713 /**
 714  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 715  * @aggregator: the aggregator we're looking at
 716  *
 717  */
 718 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 719 {
 720         u32 bandwidth=0;
 721         u32 basic_speed;
 722
 723         if (aggregator->num_of_ports) {
 724                 basic_speed = __get_link_speed(aggregator->lag_ports);
 725                 switch (basic_speed) {
 726                 case AD_LINK_SPEED_BITMASK_1MBPS:
 727                         bandwidth = aggregator->num_of_ports;
 728                         break;
 729                 case AD_LINK_SPEED_BITMASK_10MBPS:
 730                         bandwidth = aggregator->num_of_ports * 10;
 731                         break;
 732                 case AD_LINK_SPEED_BITMASK_100MBPS:
 733                         bandwidth = aggregator->num_of_ports * 100;
 734                         break;
 735                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 736                         bandwidth = aggregator->num_of_ports * 1000;
 737                         break;
 738                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 739                         bandwidth = aggregator->num_of_ports * 10000;
 740                         break;
 741                 default:
 742                         bandwidth=0; // to silent the compilor ....
 743                 }
 744         }
 745         return bandwidth;
 746 }
 747
 748 /**
 749  * __get_active_agg - get the current active aggregator
 750  * @aggregator: the aggregator we're looking at
 751  *
 752  */
 753 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 754 {
 755         struct aggregator *retval = NULL;
 756
 757         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 758                 if (aggregator->is_active) {
 759                         retval = aggregator;
 760                         break;
 761                 }
 762         }
 763
 764         return retval;
 765 }
 766
 767 /**
 768  * __update_lacpdu_from_port - update a port's lacpdu fields
 769  * @port: the port we're looking at
 770  *
 771  */
 772 static inline void __update_lacpdu_from_port(struct port *port)
 773 {
 774         struct lacpdu *lacpdu = &port->lacpdu;
 775         const struct port_params *partner = &port->partner_oper;
 776
 777         /* update current actual Actor parameters */
 778         /* lacpdu->subtype                   initialized
 779          * lacpdu->version_number            initialized
 780          * lacpdu->tlv_type_actor_info       initialized
 781          * lacpdu->actor_information_length  initialized
 782          */
 783
 784         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 785         lacpdu->actor_system = port->actor_system;
 786         lacpdu->actor_key = htons(port->actor_oper_port_key);
 787         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 788         lacpdu->actor_port = htons(port->actor_port_number);
 789         lacpdu->actor_state = port->actor_oper_port_state;
 790
 791         /* lacpdu->reserved_3_1              initialized
 792          * lacpdu->tlv_type_partner_info     initialized
 793          * lacpdu->partner_information_length initialized
 794          */
 795
 796         lacpdu->partner_system_priority = htons(partner->system_priority);
 797         lacpdu->partner_system = partner->system;
 798         lacpdu->partner_key = htons(partner->key);
 799         lacpdu->partner_port_priority = htons(partner->port_priority);
 800         lacpdu->partner_port = htons(partner->port_number);
 801         lacpdu->partner_state = partner->port_state;
 802
 803         /* lacpdu->reserved_3_2              initialized
 804          * lacpdu->tlv_type_collector_info   initialized
 805          * lacpdu->collector_information_length initialized
 806          * collector_max_delay                initialized
 807          * reserved_12[12]                   initialized
 808          * tlv_type_terminator               initialized
 809          * terminator_length                 initialized
 810          * reserved_50[50]                   initialized
 811          */
 812 }
 813
 814 //////////////////////////////////////////////////////////////////////////////////////
 815 // ================= main 802.3ad protocol code ======================================
 816 //////////////////////////////////////////////////////////////////////////////////////
 817
 818 /**
 819  * ad_lacpdu_send - send out a lacpdu packet on a given port
 820  * @port: the port we're looking at
 821  *
 822  * Returns:   0 on success
 823  *          < 0 on error
 824  */
 825 static int ad_lacpdu_send(struct port *port)
 826 {
 827         struct slave *slave = port->slave;
 828         struct sk_buff *skb;
 829         struct lacpdu_header *lacpdu_header;
 830         int length = sizeof(struct lacpdu_header);
 831
 832         skb = dev_alloc_skb(length);
 833         if (!skb) {
 834                 return -ENOMEM;
 835         }
 836
 837         skb->dev = slave->dev;
 838         skb_reset_mac_header(skb);
 839         skb->network_header = skb->mac_header + ETH_HLEN;
 840         skb->protocol = PKT_TYPE_LACPDU;
 841         skb->priority = TC_PRIO_CONTROL;
 842
 843         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 844
 845         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 846         /* Note: source addres is set to be the member's PERMANENT address,
 847            because we use it to identify loopback lacpdus in receive. */
 848         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 849         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 850
 851         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 852
 853         dev_queue_xmit(skb);
 854
 855         return 0;
 856 }
 857
 858 /**
 859  * ad_marker_send - send marker information/response on a given port
 860  * @port: the port we're looking at
 861  * @marker: marker data to send
 862  *
 863  * Returns:   0 on success
 864  *          < 0 on error
 865  */
 866 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 867 {
 868         struct slave *slave = port->slave;
 869         struct sk_buff *skb;
 870         struct bond_marker_header *marker_header;
 871         int length = sizeof(struct bond_marker_header);
 872
 873         skb = dev_alloc_skb(length + 16);
 874         if (!skb) {
 875                 return -ENOMEM;
 876         }
 877
 878         skb_reserve(skb, 16);
 879
 880         skb->dev = slave->dev;
 881         skb_reset_mac_header(skb);
 882         skb->network_header = skb->mac_header + ETH_HLEN;
 883         skb->protocol = PKT_TYPE_LACPDU;
 884
 885         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 886
 887         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 888         /* Note: source addres is set to be the member's PERMANENT address,
 889            because we use it to identify loopback MARKERs in receive. */
 890         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 891         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 892
 893         marker_header->marker = *marker; // struct copy
 894
 895         dev_queue_xmit(skb);
 896
 897         return 0;
 898 }
 899
 900 /**
 901  * ad_mux_machine - handle a port's mux state machine
 902  * @port: the port we're looking at
 903  *
 904  */
 905 static void ad_mux_machine(struct port *port)
 906 {
 907         mux_states_t last_state;
 908
 909         // keep current State Machine state to compare later if it was changed
 910         last_state = port->sm_mux_state;
 911
 912         if (port->sm_vars & AD_PORT_BEGIN) {
 913                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 914         } else {
 915                 switch (port->sm_mux_state) {
 916                 case AD_MUX_DETACHED:
 917                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
 918                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 919                         }
 920                         break;
 921                 case AD_MUX_WAITING:
 922                         // if SELECTED == FALSE return to DETACH state
 923                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 924                                 port->sm_vars &= ~AD_PORT_READY_N;
 925                                 // in order to withhold the Selection Logic to check all ports READY_N value
 926                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 927                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 928                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 929                                 break;
 930                         }
 931
 932                         // check if the wait_while_timer expired
 933                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
 934                                 port->sm_vars |= AD_PORT_READY_N;
 935                         }
 936
 937                         // in order to withhold the selection logic to check all ports READY_N value
 938                         // every callback cycle to update ready variable, we check READY_N and update READY here
 939                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 940
 941                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 942                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
 943                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 944                         }
 945                         break;
 946                 case AD_MUX_ATTACHED:
 947                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 948                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 949                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 950                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 951                                 port->sm_vars &= ~AD_PORT_READY_N;
 952                                 // in order to withhold the selection logic to check all ports READY_N value
 953                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 954                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 955                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 956                         }
 957                         break;
 958                 case AD_MUX_COLLECTING_DISTRIBUTING:
 959                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 960                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 961                            ) {
 962                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 963
 964                         } else {
 965                                 // if port state hasn't changed make
 966                                 // sure that a collecting distributing
 967                                 // port in an active aggregator is enabled
 968                                 if (port->aggregator &&
 969                                     port->aggregator->is_active &&
 970                                     !__port_is_enabled(port)) {
 971
 972                                         __enable_port(port);
 973                                 }
 974                         }
 975                         break;
 976                 default:    //to silence the compiler
 977                         break;
 978                 }
 979         }
 980
 981         // check if the state machine was changed
 982         if (port->sm_mux_state != last_state) {
 983                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
 984                 switch (port->sm_mux_state) {
 985                 case AD_MUX_DETACHED:
 986                         __detach_bond_from_agg(port);
 987                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 988                         ad_disable_collecting_distributing(port);
 989                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 990                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 991                         port->ntt = true;
 992                         break;
 993                 case AD_MUX_WAITING:
 994                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 995                         break;
 996                 case AD_MUX_ATTACHED:
 997                         __attach_bond_to_agg(port);
 998                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 999                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1000                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1001                         ad_disable_collecting_distributing(port);
1002                         port->ntt = true;
1003                         break;
1004                 case AD_MUX_COLLECTING_DISTRIBUTING:
1005                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1006                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1007                         ad_enable_collecting_distributing(port);
1008                         port->ntt = true;
1009                         break;
1010                 default:    //to silence the compiler
1011                         break;
1012                 }
1013         }
1014 }
1015
1016 /**
1017  * ad_rx_machine - handle a port's rx State Machine
1018  * @lacpdu: the lacpdu we've received
1019  * @port: the port we're looking at
1020  *
1021  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1022  * CURRENT. If timer expired set the state machine in the proper state.
1023  * In other cases, this function checks if we need to switch to other state.
1024  */
1025 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1026 {
1027         rx_states_t last_state;
1028
1029         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1030         __get_rx_machine_lock(port);
1031
1032         // keep current State Machine state to compare later if it was changed
1033         last_state = port->sm_rx_state;
1034
1035         // check if state machine should change state
1036         // first, check if port was reinitialized
1037         if (port->sm_vars & AD_PORT_BEGIN) {
1038                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1039         }
1040         // check if port is not enabled
1041         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1042                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1043         }
1044         // check if new lacpdu arrived
1045         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1046                 port->sm_rx_timer_counter = 0; // zero timer
1047                 port->sm_rx_state = AD_RX_CURRENT;
1048         } else {
1049                 // if timer is on, and if it is expired
1050                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1051                         switch (port->sm_rx_state) {
1052                         case AD_RX_EXPIRED:
1053                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1054                                 break;
1055                         case AD_RX_CURRENT:
1056                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1057                                 break;
1058                         default:    //to silence the compiler
1059                                 break;
1060                         }
1061                 } else {
1062                         // if no lacpdu arrived and no timer is on
1063                         switch (port->sm_rx_state) {
1064                         case AD_RX_PORT_DISABLED:
1065                                 if (port->sm_vars & AD_PORT_MOVED) {
1066                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1067                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1068                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1069                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1070                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1071                                 }
1072                                 break;
1073                         default:    //to silence the compiler
1074                                 break;
1075
1076                         }
1077                 }
1078         }
1079
1080         // check if the State machine was changed or new lacpdu arrived
1081         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1082                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, 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                         }
1090                         port->sm_vars &= ~AD_PORT_SELECTED;
1091                         __record_default(port);
1092                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1093                         port->sm_vars &= ~AD_PORT_MOVED;
1094                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1095
1096                         /*- Fall Through -*/
1097
1098                 case AD_RX_PORT_DISABLED:
1099                         port->sm_vars &= ~AD_PORT_MATCHED;
1100                         break;
1101                 case AD_RX_LACP_DISABLED:
1102                         port->sm_vars &= ~AD_PORT_SELECTED;
1103                         __record_default(port);
1104                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1105                         port->sm_vars |= AD_PORT_MATCHED;
1106                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1107                         break;
1108                 case AD_RX_EXPIRED:
1109                         //Reset of the Synchronization flag. (Standard 43.4.12)
1110                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1111                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1112                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1113                         port->sm_vars &= ~AD_PORT_MATCHED;
1114                         port->partner_oper.port_state |=
1115                                 AD_STATE_LACP_ACTIVITY;
1116                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1117                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1118                         break;
1119                 case AD_RX_DEFAULTED:
1120                         __update_default_selected(port);
1121                         __record_default(port);
1122                         port->sm_vars |= AD_PORT_MATCHED;
1123                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1124                         break;
1125                 case AD_RX_CURRENT:
1126                         // detect loopback situation
1127                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1128                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1129                                 pr_err(DRV_NAME ": %s: An illegal loopback occurred on "
1130                                        "adapter (%s). Check the configuration to verify that all "
1131                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1132                                        port->slave->dev->master->name, port->slave->dev->name);
1133                                 __release_rx_machine_lock(port);
1134                                 return;
1135                         }
1136                         __update_selected(lacpdu, port);
1137                         __update_ntt(lacpdu, port);
1138                         __record_pdu(lacpdu, port);
1139                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1140                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1141                         // verify that if the aggregator is enabled, the port is enabled too.
1142                         //(because if the link goes down for a short time, the 802.3ad will not
1143                         // catch it, and the port will continue to be disabled)
1144                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1145                                 __enable_port(port);
1146                         }
1147                         break;
1148                 default:    //to silence the compiler
1149                         break;
1150                 }
1151         }
1152         __release_rx_machine_lock(port);
1153 }
1154
1155 /**
1156  * ad_tx_machine - handle a port's tx state machine
1157  * @port: the port we're looking at
1158  *
1159  */
1160 static void ad_tx_machine(struct port *port)
1161 {
1162         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1163         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1164                 // check if there is something to send
1165                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1166                         __update_lacpdu_from_port(port);
1167
1168                         if (ad_lacpdu_send(port) >= 0) {
1169                                 pr_debug("Sent LACPDU on port %d\n", port->actor_port_number);
1170
1171                                 /* mark ntt as false, so it will not be sent again until
1172                                    demanded */
1173                                 port->ntt = false;
1174                         }
1175                 }
1176                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1177                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1178         }
1179 }
1180
1181 /**
1182  * ad_periodic_machine - handle a port's periodic state machine
1183  * @port: the port we're looking at
1184  *
1185  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1186  */
1187 static void ad_periodic_machine(struct port *port)
1188 {
1189         periodic_states_t last_state;
1190
1191         // keep current state machine state to compare later if it was changed
1192         last_state = port->sm_periodic_state;
1193
1194         // check if port was reinitialized
1195         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1196             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1197            ) {
1198                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1199         }
1200         // check if state machine should change state
1201         else if (port->sm_periodic_timer_counter) {
1202                 // check if periodic state machine expired
1203                 if (!(--port->sm_periodic_timer_counter)) {
1204                         // if expired then do tx
1205                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1206                 } else {
1207                         // If not expired, check if there is some new timeout parameter from the partner state
1208                         switch (port->sm_periodic_state) {
1209                         case AD_FAST_PERIODIC:
1210                                 if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1211                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1212                                 }
1213                                 break;
1214                         case AD_SLOW_PERIODIC:
1215                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1216                                         // stop current timer
1217                                         port->sm_periodic_timer_counter = 0;
1218                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1219                                 }
1220                                 break;
1221                         default:    //to silence the compiler
1222                                 break;
1223                         }
1224                 }
1225         } else {
1226                 switch (port->sm_periodic_state) {
1227                 case AD_NO_PERIODIC:
1228                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1229                         break;
1230                 case AD_PERIODIC_TX:
1231                         if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1232                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1233                         } else {
1234                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1235                         }
1236                         break;
1237                 default:    //to silence the compiler
1238                         break;
1239                 }
1240         }
1241
1242         // check if the state machine was changed
1243         if (port->sm_periodic_state != last_state) {
1244                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1245                 switch (port->sm_periodic_state) {
1246                 case AD_NO_PERIODIC:
1247                         port->sm_periodic_timer_counter = 0;       // zero timer
1248                         break;
1249                 case AD_FAST_PERIODIC:
1250                         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
1251                         break;
1252                 case AD_SLOW_PERIODIC:
1253                         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
1254                         break;
1255                 case AD_PERIODIC_TX:
1256                         port->ntt = true;
1257                         break;
1258                 default:    //to silence the compiler
1259                         break;
1260                 }
1261         }
1262 }
1263
1264 /**
1265  * ad_port_selection_logic - select aggregation groups
1266  * @port: the port we're looking at
1267  *
1268  * Select aggregation groups, and assign each port for it's aggregetor. The
1269  * selection logic is called in the inititalization (after all the handshkes),
1270  * and after every lacpdu receive (if selected is off).
1271  */
1272 static void ad_port_selection_logic(struct port *port)
1273 {
1274         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1275         struct port *last_port = NULL, *curr_port;
1276         int found = 0;
1277
1278         // if the port is already Selected, do nothing
1279         if (port->sm_vars & AD_PORT_SELECTED) {
1280                 return;
1281         }
1282
1283         // if the port is connected to other aggregator, detach it
1284         if (port->aggregator) {
1285                 // detach the port from its former aggregator
1286                 temp_aggregator=port->aggregator;
1287                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1288                         if (curr_port == port) {
1289                                 temp_aggregator->num_of_ports--;
1290                                 if (!last_port) {// if it is the first port attached to the aggregator
1291                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1292                                 } else {// not the first port attached to the aggregator
1293                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1294                                 }
1295
1296                                 // clear the port's relations to this aggregator
1297                                 port->aggregator = NULL;
1298                                 port->next_port_in_aggregator=NULL;
1299                                 port->actor_port_aggregator_identifier=0;
1300
1301                                 pr_debug("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1302                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1303                                 if (!temp_aggregator->lag_ports) {
1304                                         ad_clear_agg(temp_aggregator);
1305                                 }
1306                                 break;
1307                         }
1308                 }
1309                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1310                         pr_warning(DRV_NAME ": %s: Warning: Port %d (on %s) "
1311                                    "was related to aggregator %d but was not "
1312                                    "on its port list\n",
1313                                    port->slave->dev->master->name,
1314                                    port->actor_port_number,
1315                                    port->slave->dev->name,
1316                                    port->aggregator->aggregator_identifier);
1317                 }
1318         }
1319         // search on all aggregators for a suitable aggregator for this port
1320         for (aggregator = __get_first_agg(port); aggregator;
1321              aggregator = __get_next_agg(aggregator)) {
1322
1323                 // keep a free aggregator for later use(if needed)
1324                 if (!aggregator->lag_ports) {
1325                         if (!free_aggregator) {
1326                                 free_aggregator=aggregator;
1327                         }
1328                         continue;
1329                 }
1330                 // check if current aggregator suits us
1331                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1332                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1333                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1334                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1335                     ) &&
1336                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1337                       !aggregator->is_individual)  // but is not individual OR
1338                     )
1339                    ) {
1340                         // attach to the founded aggregator
1341                         port->aggregator = aggregator;
1342                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1343                         port->next_port_in_aggregator=aggregator->lag_ports;
1344                         port->aggregator->num_of_ports++;
1345                         aggregator->lag_ports=port;
1346                         pr_debug("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1347
1348                         // mark this port as selected
1349                         port->sm_vars |= AD_PORT_SELECTED;
1350                         found = 1;
1351                         break;
1352                 }
1353         }
1354
1355         // the port couldn't find an aggregator - attach it to a new aggregator
1356         if (!found) {
1357                 if (free_aggregator) {
1358                         // assign port a new aggregator
1359                         port->aggregator = free_aggregator;
1360                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1361
1362                         // update the new aggregator's parameters
1363                         // if port was responsed from the end-user
1364                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1365                                 port->aggregator->is_individual = false;
1366                         } else {
1367                                 port->aggregator->is_individual = true;
1368                         }
1369
1370                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1371                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1372                         port->aggregator->partner_system=port->partner_oper.system;
1373                         port->aggregator->partner_system_priority = port->partner_oper.system_priority;
1374                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1375                         port->aggregator->receive_state = 1;
1376                         port->aggregator->transmit_state = 1;
1377                         port->aggregator->lag_ports = port;
1378                         port->aggregator->num_of_ports++;
1379
1380                         // mark this port as selected
1381                         port->sm_vars |= AD_PORT_SELECTED;
1382
1383                         pr_debug("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1384                 } else {
1385                         pr_err(DRV_NAME ": %s: Port %d (on %s) did not find "
1386                                "a suitable aggregator\n",
1387                                port->slave->dev->master->name,
1388                                port->actor_port_number, port->slave->dev->name);
1389                 }
1390         }
1391         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1392         // else set ready=FALSE in all aggregator's ports
1393         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1394
1395         aggregator = __get_first_agg(port);
1396         ad_agg_selection_logic(aggregator);
1397 }
1398
1399 /*
1400  * Decide if "agg" is a better choice for the new active aggregator that
1401  * the current best, according to the ad_select policy.
1402  */
1403 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1404                                                 struct aggregator *curr)
1405 {
1406         /*
1407          * 0. If no best, select current.
1408          *
1409          * 1. If the current agg is not individual, and the best is
1410          *    individual, select current.
1411          *
1412          * 2. If current agg is individual and the best is not, keep best.
1413          *
1414          * 3. Therefore, current and best are both individual or both not
1415          *    individual, so:
1416          *
1417          * 3a. If current agg partner replied, and best agg partner did not,
1418          *     select current.
1419          *
1420          * 3b. If current agg partner did not reply and best agg partner
1421          *     did reply, keep best.
1422          *
1423          * 4.  Therefore, current and best both have partner replies or
1424          *     both do not, so perform selection policy:
1425          *
1426          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1427          *     select by bandwidth.
1428          *
1429          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1430          */
1431         if (!best)
1432                 return curr;
1433
1434         if (!curr->is_individual && best->is_individual)
1435                 return curr;
1436
1437         if (curr->is_individual && !best->is_individual)
1438                 return best;
1439
1440         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1441                 return curr;
1442
1443         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1444                 return best;
1445
1446         switch (__get_agg_selection_mode(curr->lag_ports)) {
1447         case BOND_AD_COUNT:
1448                 if (curr->num_of_ports > best->num_of_ports)
1449                         return curr;
1450
1451                 if (curr->num_of_ports < best->num_of_ports)
1452                         return best;
1453
1454                 /*FALLTHROUGH*/
1455         case BOND_AD_STABLE:
1456         case BOND_AD_BANDWIDTH:
1457                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1458                         return curr;
1459
1460                 break;
1461
1462         default:
1463                 pr_warning(DRV_NAME
1464                            ": %s: Impossible agg select mode %d\n",
1465                            curr->slave->dev->master->name,
1466                            __get_agg_selection_mode(curr->lag_ports));
1467                 break;
1468         }
1469
1470         return best;
1471 }
1472
1473 static int agg_device_up(const struct aggregator *agg)
1474 {
1475         return (netif_running(agg->slave->dev) &&
1476                 netif_carrier_ok(agg->slave->dev));
1477 }
1478
1479 /**
1480  * ad_agg_selection_logic - select an aggregation group for a team
1481  * @aggregator: the aggregator we're looking at
1482  *
1483  * It is assumed that only one aggregator may be selected for a team.
1484  *
1485  * The logic of this function is to select the aggregator according to
1486  * the ad_select policy:
1487  *
1488  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1489  * it, and to reselect the active aggregator only if the previous
1490  * aggregator has no more ports related to it.
1491  *
1492  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1493  * bandwidth, and reselect whenever a link state change takes place or the
1494  * set of slaves in the bond changes.
1495  *
1496  * BOND_AD_COUNT: select the aggregator with largest number of ports
1497  * (slaves), and reselect whenever a link state change takes place or the
1498  * set of slaves in the bond changes.
1499  *
1500  * FIXME: this function MUST be called with the first agg in the bond, or
1501  * __get_active_agg() won't work correctly. This function should be better
1502  * called with the bond itself, and retrieve the first agg from it.
1503  */
1504 static void ad_agg_selection_logic(struct aggregator *agg)
1505 {
1506         struct aggregator *best, *active, *origin;
1507         struct port *port;
1508
1509         origin = agg;
1510         active = __get_active_agg(agg);
1511         best = (active && agg_device_up(active)) ? active : NULL;
1512
1513         do {
1514                 agg->is_active = 0;
1515
1516                 if (agg->num_of_ports && agg_device_up(agg))
1517                         best = ad_agg_selection_test(best, agg);
1518
1519         } while ((agg = __get_next_agg(agg)));
1520
1521         if (best &&
1522             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1523                 /*
1524                  * For the STABLE policy, don't replace the old active
1525                  * aggregator if it's still active (it has an answering
1526                  * partner) or if both the best and active don't have an
1527                  * answering partner.
1528                  */
1529                 if (active && active->lag_ports &&
1530                     active->lag_ports->is_enabled &&
1531                     (__agg_has_partner(active) ||
1532                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1533                         if (!(!active->actor_oper_aggregator_key &&
1534                               best->actor_oper_aggregator_key)) {
1535                                 best = NULL;
1536                                 active->is_active = 1;
1537                         }
1538                 }
1539         }
1540
1541         if (best && (best == active)) {
1542                 best = NULL;
1543                 active->is_active = 1;
1544         }
1545
1546         // if there is new best aggregator, activate it
1547         if (best) {
1548                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1549                        best->aggregator_identifier, best->num_of_ports,
1550                        best->actor_oper_aggregator_key,
1551                        best->partner_oper_aggregator_key,
1552                        best->is_individual, best->is_active);
1553                 pr_debug("best ports %p slave %p %s\n",
1554                        best->lag_ports, best->slave,
1555                        best->slave ? best->slave->dev->name : "NULL");
1556
1557                 for (agg = __get_first_agg(best->lag_ports); agg;
1558                      agg = __get_next_agg(agg)) {
1559
1560                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1561                                 agg->aggregator_identifier, agg->num_of_ports,
1562                                 agg->actor_oper_aggregator_key,
1563                                 agg->partner_oper_aggregator_key,
1564                                 agg->is_individual, agg->is_active);
1565                 }
1566
1567                 // check if any partner replys
1568                 if (best->is_individual) {
1569                         pr_warning(DRV_NAME ": %s: Warning: No 802.3ad"
1570                                " response from the link partner for any"
1571                                " adapters in the bond\n",
1572                                best->slave->dev->master->name);
1573                 }
1574
1575                 best->is_active = 1;
1576                 pr_debug("LAG %d chosen as the active LAG\n",
1577                         best->aggregator_identifier);
1578                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1579                         best->aggregator_identifier, best->num_of_ports,
1580                         best->actor_oper_aggregator_key,
1581                         best->partner_oper_aggregator_key,
1582                         best->is_individual, best->is_active);
1583
1584                 // disable the ports that were related to the former active_aggregator
1585                 if (active) {
1586                         for (port = active->lag_ports; port;
1587                              port = port->next_port_in_aggregator) {
1588                                 __disable_port(port);
1589                         }
1590                 }
1591         }
1592
1593         /*
1594          * if the selected aggregator is of join individuals
1595          * (partner_system is NULL), enable their ports
1596          */
1597         active = __get_active_agg(origin);
1598
1599         if (active) {
1600                 if (!__agg_has_partner(active)) {
1601                         for (port = active->lag_ports; port;
1602                              port = port->next_port_in_aggregator) {
1603                                 __enable_port(port);
1604                         }
1605                 }
1606         }
1607
1608         if (origin->slave) {
1609                 struct bonding *bond;
1610
1611                 bond = bond_get_bond_by_slave(origin->slave);
1612                 if (bond)
1613                         bond_3ad_set_carrier(bond);
1614         }
1615 }
1616
1617 /**
1618  * ad_clear_agg - clear a given aggregator's parameters
1619  * @aggregator: the aggregator we're looking at
1620  *
1621  */
1622 static void ad_clear_agg(struct aggregator *aggregator)
1623 {
1624         if (aggregator) {
1625                 aggregator->is_individual = false;
1626                 aggregator->actor_admin_aggregator_key = 0;
1627                 aggregator->actor_oper_aggregator_key = 0;
1628                 aggregator->partner_system = null_mac_addr;
1629                 aggregator->partner_system_priority = 0;
1630                 aggregator->partner_oper_aggregator_key = 0;
1631                 aggregator->receive_state = 0;
1632                 aggregator->transmit_state = 0;
1633                 aggregator->lag_ports = NULL;
1634                 aggregator->is_active = 0;
1635                 aggregator->num_of_ports = 0;
1636                 pr_debug("LAG %d was cleared\n", aggregator->aggregator_identifier);
1637         }
1638 }
1639
1640 /**
1641  * ad_initialize_agg - initialize a given aggregator's parameters
1642  * @aggregator: the aggregator we're looking at
1643  *
1644  */
1645 static void ad_initialize_agg(struct aggregator *aggregator)
1646 {
1647         if (aggregator) {
1648                 ad_clear_agg(aggregator);
1649
1650                 aggregator->aggregator_mac_address = null_mac_addr;
1651                 aggregator->aggregator_identifier = 0;
1652                 aggregator->slave = NULL;
1653         }
1654 }
1655
1656 /**
1657  * ad_initialize_port - initialize a given port's parameters
1658  * @aggregator: the aggregator we're looking at
1659  * @lacp_fast: boolean. whether fast periodic should be used
1660  *
1661  */
1662 static void ad_initialize_port(struct port *port, int lacp_fast)
1663 {
1664         static const struct port_params tmpl = {
1665                 .system_priority = 0xffff,
1666                 .key             = 1,
1667                 .port_number     = 1,
1668                 .port_priority   = 0xff,
1669                 .port_state      = 1,
1670         };
1671         static const struct lacpdu lacpdu = {
1672                 .subtype                = 0x01,
1673                 .version_number = 0x01,
1674                 .tlv_type_actor_info = 0x01,
1675                 .actor_information_length = 0x14,
1676                 .tlv_type_partner_info = 0x02,
1677                 .partner_information_length = 0x14,
1678                 .tlv_type_collector_info = 0x03,
1679                 .collector_information_length = 0x10,
1680                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1681         };
1682
1683         if (port) {
1684                 port->actor_port_number = 1;
1685                 port->actor_port_priority = 0xff;
1686                 port->actor_system = null_mac_addr;
1687                 port->actor_system_priority = 0xffff;
1688                 port->actor_port_aggregator_identifier = 0;
1689                 port->ntt = false;
1690                 port->actor_admin_port_key = 1;
1691                 port->actor_oper_port_key  = 1;
1692                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1693                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1694
1695                 if (lacp_fast) {
1696                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1697                 }
1698
1699                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1700                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1701
1702                 port->is_enabled = true;
1703                 // ****** private parameters ******
1704                 port->sm_vars = 0x3;
1705                 port->sm_rx_state = 0;
1706                 port->sm_rx_timer_counter = 0;
1707                 port->sm_periodic_state = 0;
1708                 port->sm_periodic_timer_counter = 0;
1709                 port->sm_mux_state = 0;
1710                 port->sm_mux_timer_counter = 0;
1711                 port->sm_tx_state = 0;
1712                 port->sm_tx_timer_counter = 0;
1713                 port->slave = NULL;
1714                 port->aggregator = NULL;
1715                 port->next_port_in_aggregator = NULL;
1716                 port->transaction_id = 0;
1717
1718                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1719         }
1720 }
1721
1722 /**
1723  * ad_enable_collecting_distributing - enable a port's transmit/receive
1724  * @port: the port we're looking at
1725  *
1726  * Enable @port if it's in an active aggregator
1727  */
1728 static void ad_enable_collecting_distributing(struct port *port)
1729 {
1730         if (port->aggregator->is_active) {
1731                 pr_debug("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1732                 __enable_port(port);
1733         }
1734 }
1735
1736 /**
1737  * ad_disable_collecting_distributing - disable a port's transmit/receive
1738  * @port: the port we're looking at
1739  *
1740  */
1741 static void ad_disable_collecting_distributing(struct port *port)
1742 {
1743         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1744                 pr_debug("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1745                 __disable_port(port);
1746         }
1747 }
1748
1749 #if 0
1750 /**
1751  * ad_marker_info_send - send a marker information frame
1752  * @port: the port we're looking at
1753  *
1754  * This function does nothing since we decided not to implement send and handle
1755  * response for marker PDU's, in this stage, but only to respond to marker
1756  * information.
1757  */
1758 static void ad_marker_info_send(struct port *port)
1759 {
1760         struct bond_marker marker;
1761         u16 index;
1762
1763         // fill the marker PDU with the appropriate values
1764         marker.subtype = 0x02;
1765         marker.version_number = 0x01;
1766         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1767         marker.marker_length = 0x16;
1768         // convert requester_port to Big Endian
1769         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1770         marker.requester_system = port->actor_system;
1771         // convert requester_port(u32) to Big Endian
1772         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1773         marker.pad = 0;
1774         marker.tlv_type_terminator = 0x00;
1775         marker.terminator_length = 0x00;
1776         for (index=0; index<90; index++) {
1777                 marker.reserved_90[index]=0;
1778         }
1779
1780         // send the marker information
1781         if (ad_marker_send(port, &marker) >= 0) {
1782                 pr_debug("Sent Marker Information on port %d\n", port->actor_port_number);
1783         }
1784 }
1785 #endif
1786
1787 /**
1788  * ad_marker_info_received - handle receive of a Marker information frame
1789  * @marker_info: Marker info received
1790  * @port: the port we're looking at
1791  *
1792  */
1793 static void ad_marker_info_received(struct bond_marker *marker_info,
1794         struct port *port)
1795 {
1796         struct bond_marker marker;
1797
1798         // copy the received marker data to the response marker
1799         //marker = *marker_info;
1800         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1801         // change the marker subtype to marker response
1802         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1803         // send the marker response
1804
1805         if (ad_marker_send(port, &marker) >= 0) {
1806                 pr_debug("Sent Marker Response on port %d\n", port->actor_port_number);
1807         }
1808 }
1809
1810 /**
1811  * ad_marker_response_received - handle receive of a marker response frame
1812  * @marker: marker PDU received
1813  * @port: the port we're looking at
1814  *
1815  * This function does nothing since we decided not to implement send and handle
1816  * response for marker PDU's, in this stage, but only to respond to marker
1817  * information.
1818  */
1819 static void ad_marker_response_received(struct bond_marker *marker,
1820         struct port *port)
1821 {
1822         marker=NULL; // just to satisfy the compiler
1823         port=NULL;  // just to satisfy the compiler
1824         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1825 }
1826
1827 //////////////////////////////////////////////////////////////////////////////////////
1828 // ================= AD exported functions to the main bonding code ==================
1829 //////////////////////////////////////////////////////////////////////////////////////
1830
1831 // Check aggregators status in team every T seconds
1832 #define AD_AGGREGATOR_SELECTION_TIMER  8
1833
1834 /*
1835  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1836  *
1837  * Set the aggregation selection timer, to initiate an agg selection in
1838  * the very near future.  Called during first initialization, and during
1839  * any down to up transitions of the bond.
1840  */
1841 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1842 {
1843         BOND_AD_INFO(bond).agg_select_timer = timeout;
1844         BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
1845 }
1846
1847 static u16 aggregator_identifier;
1848
1849 /**
1850  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1851  * @bond: bonding struct to work on
1852  * @tick_resolution: tick duration (millisecond resolution)
1853  * @lacp_fast: boolean. whether fast periodic should be used
1854  *
1855  * Can be called only after the mac address of the bond is set.
1856  */
1857 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1858 {
1859         // check that the bond is not initialized yet
1860         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1861                                 bond->dev->dev_addr)) {
1862
1863                 aggregator_identifier = 0;
1864
1865                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1866                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1867                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1868
1869                 // initialize how many times this module is called in one second(should be about every 100ms)
1870                 ad_ticks_per_sec = tick_resolution;
1871
1872                 bond_3ad_initiate_agg_selection(bond,
1873                                                 AD_AGGREGATOR_SELECTION_TIMER *
1874                                                 ad_ticks_per_sec);
1875         }
1876 }
1877
1878 /**
1879  * bond_3ad_bind_slave - initialize a slave's port
1880  * @slave: slave struct to work on
1881  *
1882  * Returns:   0 on success
1883  *          < 0 on error
1884  */
1885 int bond_3ad_bind_slave(struct slave *slave)
1886 {
1887         struct bonding *bond = bond_get_bond_by_slave(slave);
1888         struct port *port;
1889         struct aggregator *aggregator;
1890
1891         if (bond == NULL) {
1892                 pr_err(DRV_NAME ": %s: The slave %s is not attached to "
1893                        "its bond\n",
1894                        slave->dev->master->name, slave->dev->name);
1895                 return -1;
1896         }
1897
1898         //check that the slave has not been intialized yet.
1899         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1900
1901                 // port initialization
1902                 port = &(SLAVE_AD_INFO(slave).port);
1903
1904                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1905
1906                 port->slave = slave;
1907                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1908                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1909                 //              ------------------------------------------------------------
1910                 // Port key :   | User key                       |      Speed       |Duplex|
1911                 //              ------------------------------------------------------------
1912                 //              16                               6               1 0
1913                 port->actor_admin_port_key = 0; // initialize this parameter
1914                 port->actor_admin_port_key |= __get_duplex(port);
1915                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1916                 port->actor_oper_port_key = port->actor_admin_port_key;
1917                 // if the port is not full duplex, then the port should be not lacp Enabled
1918                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1919                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1920                 }
1921                 // actor system is the bond's system
1922                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1923                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1924                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1925                 port->aggregator = NULL;
1926                 port->next_port_in_aggregator = NULL;
1927
1928                 __disable_port(port);
1929                 __initialize_port_locks(port);
1930
1931
1932                 // aggregator initialization
1933                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1934
1935                 ad_initialize_agg(aggregator);
1936
1937                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1938                 aggregator->aggregator_identifier = (++aggregator_identifier);
1939                 aggregator->slave = slave;
1940                 aggregator->is_active = 0;
1941                 aggregator->num_of_ports = 0;
1942         }
1943
1944         return 0;
1945 }
1946
1947 /**
1948  * bond_3ad_unbind_slave - deinitialize a slave's port
1949  * @slave: slave struct to work on
1950  *
1951  * Search for the aggregator that is related to this port, remove the
1952  * aggregator and assign another aggregator for other port related to it
1953  * (if any), and remove the port.
1954  */
1955 void bond_3ad_unbind_slave(struct slave *slave)
1956 {
1957         struct port *port, *prev_port, *temp_port;
1958         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1959         int select_new_active_agg = 0;
1960
1961         // find the aggregator related to this slave
1962         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1963
1964         // find the port related to this slave
1965         port = &(SLAVE_AD_INFO(slave).port);
1966
1967         // if slave is null, the whole port is not initialized
1968         if (!port->slave) {
1969                 pr_warning(DRV_NAME ": Warning: %s: Trying to "
1970                            "unbind an uninitialized port on %s\n",
1971                            slave->dev->master->name, slave->dev->name);
1972                 return;
1973         }
1974
1975         pr_debug("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1976
1977         /* Tell the partner that this port is not suitable for aggregation */
1978         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1979         __update_lacpdu_from_port(port);
1980         ad_lacpdu_send(port);
1981
1982         // check if this aggregator is occupied
1983         if (aggregator->lag_ports) {
1984                 // check if there are other ports related to this aggregator except
1985                 // the port related to this slave(thats ensure us that there is a
1986                 // reason to search for new aggregator, and that we will find one
1987                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1988                         // find new aggregator for the related port(s)
1989                         new_aggregator = __get_first_agg(port);
1990                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1991                                 // if the new aggregator is empty, or it is connected to our port only
1992                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1993                                         break;
1994                                 }
1995                         }
1996                         // if new aggregator found, copy the aggregator's parameters
1997                         // and connect the related lag_ports to the new aggregator
1998                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1999                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
2000
2001                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
2002                                         pr_info(DRV_NAME ": %s: Removing an active aggregator\n",
2003                                                 aggregator->slave->dev->master->name);
2004                                         // select new active aggregator
2005                                          select_new_active_agg = 1;
2006                                 }
2007
2008                                 new_aggregator->is_individual = aggregator->is_individual;
2009                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2010                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2011                                 new_aggregator->partner_system = aggregator->partner_system;
2012                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2013                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2014                                 new_aggregator->receive_state = aggregator->receive_state;
2015                                 new_aggregator->transmit_state = aggregator->transmit_state;
2016                                 new_aggregator->lag_ports = aggregator->lag_ports;
2017                                 new_aggregator->is_active = aggregator->is_active;
2018                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2019
2020                                 // update the information that is written on the ports about the aggregator
2021                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2022                                         temp_port->aggregator=new_aggregator;
2023                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2024                                 }
2025
2026                                 // clear the aggregator
2027                                 ad_clear_agg(aggregator);
2028
2029                                 if (select_new_active_agg) {
2030                                         ad_agg_selection_logic(__get_first_agg(port));
2031                                 }
2032                         } else {
2033                                 pr_warning(DRV_NAME ": %s: Warning: unbinding aggregator, "
2034                                            "and could not find a new aggregator for its ports\n",
2035                                            slave->dev->master->name);
2036                         }
2037                 } else { // in case that the only port related to this aggregator is the one we want to remove
2038                         select_new_active_agg = aggregator->is_active;
2039                         // clear the aggregator
2040                         ad_clear_agg(aggregator);
2041                         if (select_new_active_agg) {
2042                                 pr_info(DRV_NAME ": %s: Removing an active aggregator\n",
2043                                         slave->dev->master->name);
2044                                 // select new active aggregator
2045                                 ad_agg_selection_logic(__get_first_agg(port));
2046                         }
2047                 }
2048         }
2049
2050         pr_debug("Unbinding port %d\n", port->actor_port_number);
2051         // find the aggregator that this port is connected to
2052         temp_aggregator = __get_first_agg(port);
2053         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2054                 prev_port = NULL;
2055                 // search the port in the aggregator's related ports
2056                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2057                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2058                                 if (prev_port) {
2059                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2060                                 } else {
2061                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2062                                 }
2063                                 temp_aggregator->num_of_ports--;
2064                                 if (temp_aggregator->num_of_ports==0) {
2065                                         select_new_active_agg = temp_aggregator->is_active;
2066                                         // clear the aggregator
2067                                         ad_clear_agg(temp_aggregator);
2068                                         if (select_new_active_agg) {
2069                                                 pr_info(DRV_NAME ": %s: Removing an active aggregator\n",
2070                                                         slave->dev->master->name);
2071                                                 // select new active aggregator
2072                                                 ad_agg_selection_logic(__get_first_agg(port));
2073                                         }
2074                                 }
2075                                 break;
2076                         }
2077                 }
2078         }
2079         port->slave=NULL;
2080 }
2081
2082 /**
2083  * bond_3ad_state_machine_handler - handle state machines timeout
2084  * @bond: bonding struct to work on
2085  *
2086  * The state machine handling concept in this module is to check every tick
2087  * which state machine should operate any function. The execution order is
2088  * round robin, so when we have an interaction between state machines, the
2089  * reply of one to each other might be delayed until next tick.
2090  *
2091  * This function also complete the initialization when the agg_select_timer
2092  * times out, and it selects an aggregator for the ports that are yet not
2093  * related to any aggregator, and selects the active aggregator for a bond.
2094  */
2095 void bond_3ad_state_machine_handler(struct work_struct *work)
2096 {
2097         struct bonding *bond = container_of(work, struct bonding,
2098                                             ad_work.work);
2099         struct port *port;
2100         struct aggregator *aggregator;
2101
2102         read_lock(&bond->lock);
2103
2104         if (bond->kill_timers) {
2105                 goto out;
2106         }
2107
2108         //check if there are any slaves
2109         if (bond->slave_cnt == 0) {
2110                 goto re_arm;
2111         }
2112
2113         // check if agg_select_timer timer after initialize is timed out
2114         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2115                 // select the active aggregator for the bond
2116                 if ((port = __get_first_port(bond))) {
2117                         if (!port->slave) {
2118                                 pr_warning(DRV_NAME ": %s: Warning: bond's first port is "
2119                                            "uninitialized\n", bond->dev->name);
2120                                 goto re_arm;
2121                         }
2122
2123                         aggregator = __get_first_agg(port);
2124                         ad_agg_selection_logic(aggregator);
2125                 }
2126                 bond_3ad_set_carrier(bond);
2127         }
2128
2129         // for each port run the state machines
2130         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2131                 if (!port->slave) {
2132                         pr_warning(DRV_NAME ": %s: Warning: Found an uninitialized "
2133                                    "port\n", bond->dev->name);
2134                         goto re_arm;
2135                 }
2136
2137                 ad_rx_machine(NULL, port);
2138                 ad_periodic_machine(port);
2139                 ad_port_selection_logic(port);
2140                 ad_mux_machine(port);
2141                 ad_tx_machine(port);
2142
2143                 // turn off the BEGIN bit, since we already handled it
2144                 if (port->sm_vars & AD_PORT_BEGIN) {
2145                         port->sm_vars &= ~AD_PORT_BEGIN;
2146                 }
2147         }
2148
2149 re_arm:
2150         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2151 out:
2152         read_unlock(&bond->lock);
2153 }
2154
2155 /**
2156  * bond_3ad_rx_indication - handle a received frame
2157  * @lacpdu: received lacpdu
2158  * @slave: slave struct to work on
2159  * @length: length of the data received
2160  *
2161  * It is assumed that frames that were sent on this NIC don't returned as new
2162  * received frames (loopback). Since only the payload is given to this
2163  * function, it check for loopback.
2164  */
2165 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2166 {
2167         struct port *port;
2168
2169         if (length >= sizeof(struct lacpdu)) {
2170
2171                 port = &(SLAVE_AD_INFO(slave).port);
2172
2173                 if (!port->slave) {
2174                         pr_warning(DRV_NAME ": %s: Warning: port of slave %s "
2175                                    "is uninitialized\n",
2176                                    slave->dev->name, slave->dev->master->name);
2177                         return;
2178                 }
2179
2180                 switch (lacpdu->subtype) {
2181                 case AD_TYPE_LACPDU:
2182                         pr_debug("Received LACPDU on port %d\n", port->actor_port_number);
2183                         ad_rx_machine(lacpdu, port);
2184                         break;
2185
2186                 case AD_TYPE_MARKER:
2187                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2188
2189                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2190                         case AD_MARKER_INFORMATION_SUBTYPE:
2191                                 pr_debug("Received Marker Information on port %d\n", port->actor_port_number);
2192                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2193                                 break;
2194
2195                         case AD_MARKER_RESPONSE_SUBTYPE:
2196                                 pr_debug("Received Marker Response on port %d\n", port->actor_port_number);
2197                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2198                                 break;
2199
2200                         default:
2201                                 pr_debug("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2202                         }
2203                 }
2204         }
2205 }
2206
2207 /**
2208  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2209  * @slave: slave struct to work on
2210  *
2211  * Handle reselection of aggregator (if needed) for this port.
2212  */
2213 void bond_3ad_adapter_speed_changed(struct slave *slave)
2214 {
2215         struct port *port;
2216
2217         port = &(SLAVE_AD_INFO(slave).port);
2218
2219         // if slave is null, the whole port is not initialized
2220         if (!port->slave) {
2221                 pr_warning(DRV_NAME ": Warning: %s: speed "
2222                            "changed for uninitialized port on %s\n",
2223                            slave->dev->master->name, slave->dev->name);
2224                 return;
2225         }
2226
2227         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2228         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2229         pr_debug("Port %d changed speed\n", port->actor_port_number);
2230         // there is no need to reselect a new aggregator, just signal the
2231         // state machines to reinitialize
2232         port->sm_vars |= AD_PORT_BEGIN;
2233 }
2234
2235 /**
2236  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2237  * @slave: slave struct to work on
2238  *
2239  * Handle reselection of aggregator (if needed) for this port.
2240  */
2241 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2242 {
2243         struct port *port;
2244
2245         port=&(SLAVE_AD_INFO(slave).port);
2246
2247         // if slave is null, the whole port is not initialized
2248         if (!port->slave) {
2249                 pr_warning(DRV_NAME ": %s: Warning: duplex changed "
2250                            "for uninitialized port on %s\n",
2251                            slave->dev->master->name, slave->dev->name);
2252                 return;
2253         }
2254
2255         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2256         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2257         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2258         // there is no need to reselect a new aggregator, just signal the
2259         // state machines to reinitialize
2260         port->sm_vars |= AD_PORT_BEGIN;
2261 }
2262
2263 /**
2264  * bond_3ad_handle_link_change - handle a slave's link status change indication
2265  * @slave: slave struct to work on
2266  * @status: whether the link is now up or down
2267  *
2268  * Handle reselection of aggregator (if needed) for this port.
2269  */
2270 void bond_3ad_handle_link_change(struct slave *slave, char link)
2271 {
2272         struct port *port;
2273
2274         port = &(SLAVE_AD_INFO(slave).port);
2275
2276         // if slave is null, the whole port is not initialized
2277         if (!port->slave) {
2278                 pr_warning(DRV_NAME ": Warning: %s: link status changed for "
2279                            "uninitialized port on %s\n",
2280                            slave->dev->master->name, slave->dev->name);
2281                 return;
2282         }
2283
2284         // 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)
2285         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2286         if (link == BOND_LINK_UP) {
2287                 port->is_enabled = true;
2288                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2289                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2290                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2291                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2292         } else {
2293                 /* link has failed */
2294                 port->is_enabled = false;
2295                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2296                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2297         }
2298         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2299         // there is no need to reselect a new aggregator, just signal the
2300         // state machines to reinitialize
2301         port->sm_vars |= AD_PORT_BEGIN;
2302 }
2303
2304 /*
2305  * set link state for bonding master: if we have an active
2306  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2307  * have an active aggregator if there are no slaves with link up.
2308  *
2309  * This behavior complies with IEEE 802.3 section 43.3.9.
2310  *
2311  * Called by bond_set_carrier(). Return zero if carrier state does not
2312  * change, nonzero if it does.
2313  */
2314 int bond_3ad_set_carrier(struct bonding *bond)
2315 {
2316         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2317                 if (!netif_carrier_ok(bond->dev)) {
2318                         netif_carrier_on(bond->dev);
2319                         return 1;
2320                 }
2321                 return 0;
2322         }
2323
2324         if (netif_carrier_ok(bond->dev)) {
2325                 netif_carrier_off(bond->dev);
2326                 return 1;
2327         }
2328         return 0;
2329 }
2330
2331 /**
2332  * bond_3ad_get_active_agg_info - get information of the active aggregator
2333  * @bond: bonding struct to work on
2334  * @ad_info: ad_info struct to fill with the bond's info
2335  *
2336  * Returns:   0 on success
2337  *          < 0 on error
2338  */
2339 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2340 {
2341         struct aggregator *aggregator = NULL;
2342         struct port *port;
2343
2344         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2345                 if (port->aggregator && port->aggregator->is_active) {
2346                         aggregator = port->aggregator;
2347                         break;
2348                 }
2349         }
2350
2351         if (aggregator) {
2352                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2353                 ad_info->ports = aggregator->num_of_ports;
2354                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2355                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2356                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2357                 return 0;
2358         }
2359
2360         return -1;
2361 }
2362
2363 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2364 {
2365         struct slave *slave, *start_at;
2366         struct bonding *bond = netdev_priv(dev);
2367         int slave_agg_no;
2368         int slaves_in_agg;
2369         int agg_id;
2370         int i;
2371         struct ad_info ad_info;
2372         int res = 1;
2373
2374         /* make sure that the slaves list will
2375          * not change during tx
2376          */
2377         read_lock(&bond->lock);
2378
2379         if (!BOND_IS_OK(bond)) {
2380                 goto out;
2381         }
2382
2383         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2384                 pr_debug(DRV_NAME ": %s: Error: "
2385                          "bond_3ad_get_active_agg_info failed\n", dev->name);
2386                 goto out;
2387         }
2388
2389         slaves_in_agg = ad_info.ports;
2390         agg_id = ad_info.aggregator_id;
2391
2392         if (slaves_in_agg == 0) {
2393                 /*the aggregator is empty*/
2394                 pr_debug(DRV_NAME ": %s: Error: active aggregator is empty\n",
2395                          dev->name);
2396                 goto out;
2397         }
2398
2399         slave_agg_no = bond->xmit_hash_policy(skb, slaves_in_agg);
2400
2401         bond_for_each_slave(bond, slave, i) {
2402                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2403
2404                 if (agg && (agg->aggregator_identifier == agg_id)) {
2405                         slave_agg_no--;
2406                         if (slave_agg_no < 0) {
2407                                 break;
2408                         }
2409                 }
2410         }
2411
2412         if (slave_agg_no >= 0) {
2413                 pr_err(DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2414                        "for aggregator ID %d\n", dev->name, agg_id);
2415                 goto out;
2416         }
2417
2418         start_at = slave;
2419
2420         bond_for_each_slave_from(bond, slave, i, start_at) {
2421                 int slave_agg_id = 0;
2422                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2423
2424                 if (agg) {
2425                         slave_agg_id = agg->aggregator_identifier;
2426                 }
2427
2428                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2429                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2430                         break;
2431                 }
2432         }
2433
2434 out:
2435         if (res) {
2436                 /* no suitable interface, frame not sent */
2437                 dev_kfree_skb(skb);
2438         }
2439         read_unlock(&bond->lock);
2440         return NETDEV_TX_OK;
2441 }
2442
2443 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2444 {
2445         struct bonding *bond = netdev_priv(dev);
2446         struct slave *slave = NULL;
2447         int ret = NET_RX_DROP;
2448
2449         if (!(dev->flags & IFF_MASTER))
2450                 goto out;
2451
2452         read_lock(&bond->lock);
2453         slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev),
2454                                         orig_dev);
2455         if (!slave)
2456                 goto out_unlock;
2457
2458         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2459
2460         ret = NET_RX_SUCCESS;
2461
2462 out_unlock:
2463         read_unlock(&bond->lock);
2464 out:
2465         dev_kfree_skb(skb);
2466
2467         return ret;
2468 }