drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/skbuff.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/if_bonding.h>
  32 #include <linux/pkt_sched.h>
  33 #include <net/net_namespace.h>
  34 #include "bonding.h"
  35 #include "bond_3ad.h"
  36
  37 // General definitions
  38 #define AD_SHORT_TIMEOUT           1
  39 #define AD_LONG_TIMEOUT            0
  40 #define AD_STANDBY                 0x2
  41 #define AD_MAX_TX_IN_SECOND        3
  42 #define AD_COLLECTOR_MAX_DELAY     0
  43
  44 // Timer definitions(43.4.4 in the 802.3ad standard)
  45 #define AD_FAST_PERIODIC_TIME      1
  46 #define AD_SLOW_PERIODIC_TIME      30
  47 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  48 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  49 #define AD_CHURN_DETECTION_TIME    60
  50 #define AD_AGGREGATE_WAIT_TIME     2
  51
  52 // Port state definitions(43.4.2.2 in the 802.3ad standard)
  53 #define AD_STATE_LACP_ACTIVITY   0x1
  54 #define AD_STATE_LACP_TIMEOUT    0x2
  55 #define AD_STATE_AGGREGATION     0x4
  56 #define AD_STATE_SYNCHRONIZATION 0x8
  57 #define AD_STATE_COLLECTING      0x10
  58 #define AD_STATE_DISTRIBUTING    0x20
  59 #define AD_STATE_DEFAULTED       0x40
  60 #define AD_STATE_EXPIRED         0x80
  61
  62 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
  63 #define AD_PORT_BEGIN           0x1
  64 #define AD_PORT_LACP_ENABLED    0x2
  65 #define AD_PORT_ACTOR_CHURN     0x4
  66 #define AD_PORT_PARTNER_CHURN   0x8
  67 #define AD_PORT_READY           0x10
  68 #define AD_PORT_READY_N         0x20
  69 #define AD_PORT_MATCHED         0x40
  70 #define AD_PORT_STANDBY         0x80
  71 #define AD_PORT_SELECTED        0x100
  72 #define AD_PORT_MOVED           0x200
  73
  74 // Port Key definitions
  75 // key is determined according to the link speed, duplex and
  76 // user key(which is yet not supported)
  77 //              ------------------------------------------------------------
  78 // Port key :   | User key                       |      Speed       |Duplex|
  79 //              ------------------------------------------------------------
  80 //              16                               6               1 0
  81 #define  AD_DUPLEX_KEY_BITS    0x1
  82 #define  AD_SPEED_KEY_BITS     0x3E
  83 #define  AD_USER_KEY_BITS      0xFFC0
  84
  85 //dalloun
  86 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  87 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  88 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  89 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  90 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  91 //endalloun
  92
  93 // compare MAC addresses
  94 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  95
  96 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
  97 static u16 ad_ticks_per_sec;
  98 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  99
 100 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 101
 102 // ================= main 802.3ad protocol functions ==================
 103 static int ad_lacpdu_send(struct port *port);
 104 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 105 static void ad_mux_machine(struct port *port);
 106 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 107 static void ad_tx_machine(struct port *port);
 108 static void ad_periodic_machine(struct port *port);
 109 static void ad_port_selection_logic(struct port *port);
 110 static void ad_agg_selection_logic(struct aggregator *aggregator);
 111 static void ad_clear_agg(struct aggregator *aggregator);
 112 static void ad_initialize_agg(struct aggregator *aggregator);
 113 static void ad_initialize_port(struct port *port, int lacp_fast);
 114 static void ad_enable_collecting_distributing(struct port *port);
 115 static void ad_disable_collecting_distributing(struct port *port);
 116 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 117 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 118
 119
 120 /////////////////////////////////////////////////////////////////////////////////
 121 // ================= api to bonding and kernel code ==================
 122 /////////////////////////////////////////////////////////////////////////////////
 123
 124 /**
 125  * __get_bond_by_port - get the port's bonding struct
 126  * @port: the port we're looking at
 127  *
 128  * Return @port's bonding struct, or %NULL if it can't be found.
 129  */
 130 static inline struct bonding *__get_bond_by_port(struct port *port)
 131 {
 132         if (port->slave == NULL)
 133                 return NULL;
 134
 135         return bond_get_bond_by_slave(port->slave);
 136 }
 137
 138 /**
 139  * __get_first_port - get the first port in the bond
 140  * @bond: the bond we're looking at
 141  *
 142  * Return the port of the first slave in @bond, or %NULL if it can't be found.
 143  */
 144 static inline struct port *__get_first_port(struct bonding *bond)
 145 {
 146         if (bond->slave_cnt == 0)
 147                 return NULL;
 148
 149         return &(SLAVE_AD_INFO(bond->first_slave).port);
 150 }
 151
 152 /**
 153  * __get_next_port - get the next port in the bond
 154  * @port: the port we're looking at
 155  *
 156  * Return the port of the slave that is next in line of @port's slave in the
 157  * bond, or %NULL if it can't be found.
 158  */
 159 static inline struct port *__get_next_port(struct port *port)
 160 {
 161         struct bonding *bond = __get_bond_by_port(port);
 162         struct slave *slave = port->slave;
 163
 164         // If there's no bond for this port, or this is the last slave
 165         if ((bond == NULL) || (slave->next == bond->first_slave))
 166                 return NULL;
 167
 168         return &(SLAVE_AD_INFO(slave->next).port);
 169 }
 170
 171 /**
 172  * __get_first_agg - get the first aggregator in the bond
 173  * @bond: the bond we're looking at
 174  *
 175  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 176  * found.
 177  */
 178 static inline struct aggregator *__get_first_agg(struct port *port)
 179 {
 180         struct bonding *bond = __get_bond_by_port(port);
 181
 182         // If there's no bond for this port, or bond has no slaves
 183         if ((bond == NULL) || (bond->slave_cnt == 0))
 184                 return NULL;
 185
 186         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
 187 }
 188
 189 /**
 190  * __get_next_agg - get the next aggregator in the bond
 191  * @aggregator: the aggregator we're looking at
 192  *
 193  * Return the aggregator of the slave that is next in line of @aggregator's
 194  * slave in the bond, or %NULL if it can't be found.
 195  */
 196 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
 197 {
 198         struct slave *slave = aggregator->slave;
 199         struct bonding *bond = bond_get_bond_by_slave(slave);
 200
 201         // If there's no bond for this aggregator, or this is the last slave
 202         if ((bond == NULL) || (slave->next == bond->first_slave))
 203                 return NULL;
 204
 205         return &(SLAVE_AD_INFO(slave->next).aggregator);
 206 }
 207
 208 /*
 209  * __agg_has_partner
 210  *
 211  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 212  * address for the partner).  Return 0 if not.
 213  */
 214 static inline int __agg_has_partner(struct aggregator *agg)
 215 {
 216         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 217 }
 218
 219 /**
 220  * __disable_port - disable the port's slave
 221  * @port: the port we're looking at
 222  *
 223  */
 224 static inline void __disable_port(struct port *port)
 225 {
 226         bond_set_slave_inactive_flags(port->slave);
 227 }
 228
 229 /**
 230  * __enable_port - enable the port's slave, if it's up
 231  * @port: the port we're looking at
 232  *
 233  */
 234 static inline void __enable_port(struct port *port)
 235 {
 236         struct slave *slave = port->slave;
 237
 238         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
 239                 bond_set_slave_active_flags(slave);
 240 }
 241
 242 /**
 243  * __port_is_enabled - check if the port's slave is in active state
 244  * @port: the port we're looking at
 245  *
 246  */
 247 static inline int __port_is_enabled(struct port *port)
 248 {
 249         return port->slave->state == BOND_STATE_ACTIVE;
 250 }
 251
 252 /**
 253  * __get_agg_selection_mode - get the aggregator selection mode
 254  * @port: the port we're looking at
 255  *
 256  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 257  */
 258 static inline u32 __get_agg_selection_mode(struct port *port)
 259 {
 260         struct bonding *bond = __get_bond_by_port(port);
 261
 262         if (bond == NULL)
 263                 return BOND_AD_STABLE;
 264
 265         return BOND_AD_INFO(bond).agg_select_mode;
 266 }
 267
 268 /**
 269  * __check_agg_selection_timer - check if the selection timer has expired
 270  * @port: the port we're looking at
 271  *
 272  */
 273 static inline int __check_agg_selection_timer(struct port *port)
 274 {
 275         struct bonding *bond = __get_bond_by_port(port);
 276
 277         if (bond == NULL)
 278                 return 0;
 279
 280         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 281 }
 282
 283 /**
 284  * __get_rx_machine_lock - lock the port's RX machine
 285  * @port: the port we're looking at
 286  *
 287  */
 288 static inline void __get_rx_machine_lock(struct port *port)
 289 {
 290         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 291 }
 292
 293 /**
 294  * __release_rx_machine_lock - unlock the port's RX machine
 295  * @port: the port we're looking at
 296  *
 297  */
 298 static inline void __release_rx_machine_lock(struct port *port)
 299 {
 300         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 301 }
 302
 303 /**
 304  * __get_link_speed - get a port's speed
 305  * @port: the port we're looking at
 306  *
 307  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 308  *     0,
 309  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 310  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 311  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 312  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 313  */
 314 static u16 __get_link_speed(struct port *port)
 315 {
 316         struct slave *slave = port->slave;
 317         u16 speed;
 318
 319         /* this if covers only a special case: when the configuration starts with
 320          * link down, it sets the speed to 0.
 321          * This is done in spite of the fact that the e100 driver reports 0 to be
 322          * compatible with MVT in the future.*/
 323         if (slave->link != BOND_LINK_UP)
 324                 speed = 0;
 325         else {
 326                 switch (slave->speed) {
 327                 case SPEED_10:
 328                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 329                         break;
 330
 331                 case SPEED_100:
 332                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 333                         break;
 334
 335                 case SPEED_1000:
 336                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 337                         break;
 338
 339                 case SPEED_10000:
 340                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 341                         break;
 342
 343                 default:
 344                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 345                         break;
 346                 }
 347         }
 348
 349         pr_debug("Port %d Received link speed %d update from adapter\n",
 350                  port->actor_port_number, speed);
 351         return speed;
 352 }
 353
 354 /**
 355  * __get_duplex - get a port's duplex
 356  * @port: the port we're looking at
 357  *
 358  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 359  *     0x01 if in full duplex
 360  *     0x00 otherwise
 361  */
 362 static u8 __get_duplex(struct port *port)
 363 {
 364         struct slave *slave = port->slave;
 365
 366         u8 retval;
 367
 368         //  handling a special case: when the configuration starts with
 369         // link down, it sets the duplex to 0.
 370         if (slave->link != BOND_LINK_UP)
 371                 retval = 0x0;
 372         else {
 373                 switch (slave->duplex) {
 374                 case DUPLEX_FULL:
 375                         retval = 0x1;
 376                         pr_debug("Port %d Received status full duplex update from adapter\n",
 377                                  port->actor_port_number);
 378                         break;
 379                 case DUPLEX_HALF:
 380                 default:
 381                         retval = 0x0;
 382                         pr_debug("Port %d Received status NOT full duplex update from adapter\n",
 383                                  port->actor_port_number);
 384                         break;
 385                 }
 386         }
 387         return retval;
 388 }
 389
 390 /**
 391  * __initialize_port_locks - initialize a port's RX machine spinlock
 392  * @port: the port we're looking at
 393  *
 394  */
 395 static inline void __initialize_port_locks(struct port *port)
 396 {
 397         // make sure it isn't called twice
 398         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
 399 }
 400
 401 //conversions
 402
 403 /**
 404  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 405  * @timer_type: which timer to operate
 406  * @par: timer parameter. see below
 407  *
 408  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 409  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 410  *                                                  %SLOW_PERIODIC_TIME.
 411  */
 412 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 413 {
 414         u16 retval = 0; /* to silence the compiler */
 415
 416         switch (timer_type) {
 417         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 418                 if (par)
 419                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 420                 else
 421                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 422                 break;
 423         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 424                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 425                 break;
 426         case AD_PERIODIC_TIMER:     // for periodic machine
 427                 retval = (par*ad_ticks_per_sec); // long timeout
 428                 break;
 429         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 430                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 431                 break;
 432         case AD_WAIT_WHILE_TIMER:           // for selection machine
 433                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 434                 break;
 435         }
 436         return retval;
 437 }
 438
 439
 440 /////////////////////////////////////////////////////////////////////////////////
 441 // ================= ad_rx_machine helper functions ==================
 442 /////////////////////////////////////////////////////////////////////////////////
 443
 444 /**
 445  * __choose_matched - update a port's matched variable from a received lacpdu
 446  * @lacpdu: the lacpdu we've received
 447  * @port: the port we're looking at
 448  *
 449  * Update the value of the matched variable, using parameter values from a
 450  * newly received lacpdu. Parameter values for the partner carried in the
 451  * received PDU are compared with the corresponding operational parameter
 452  * values for the actor. Matched is set to TRUE if all of these parameters
 453  * match and the PDU parameter partner_state.aggregation has the same value as
 454  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 455  * in the aggregation. Matched is also set to TRUE if the value of
 456  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 457  * an individual link and lacp will actively maintain the link. Otherwise,
 458  * matched is set to FALSE. LACP is considered to be actively maintaining the
 459  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 460  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 461  * partner_state.lacp_activity variables are TRUE.
 462  *
 463  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 464  * used here to implement the language from 802.3ad 43.4.9 that requires
 465  * recordPDU to "match" the LACPDU parameters to the stored values.
 466  */
 467 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 468 {
 469         // check if all parameters are alike
 470         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 471              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 472              !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 473              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 474              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 475              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 476             // or this is individual link(aggregation == FALSE)
 477             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 478                 ) {
 479                 // update the state machine Matched variable
 480                 port->sm_vars |= AD_PORT_MATCHED;
 481         } else {
 482                 port->sm_vars &= ~AD_PORT_MATCHED;
 483         }
 484 }
 485
 486 /**
 487  * __record_pdu - record parameters from a received lacpdu
 488  * @lacpdu: the lacpdu we've received
 489  * @port: the port we're looking at
 490  *
 491  * Record the parameter values for the Actor carried in a received lacpdu as
 492  * the current partner operational parameter values and sets
 493  * actor_oper_port_state.defaulted to FALSE.
 494  */
 495 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 496 {
 497         if (lacpdu && port) {
 498                 struct port_params *partner = &port->partner_oper;
 499
 500                 __choose_matched(lacpdu, port);
 501                 // record the new parameter values for the partner operational
 502                 partner->port_number = ntohs(lacpdu->actor_port);
 503                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 504                 partner->system = lacpdu->actor_system;
 505                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 506                 partner->key = ntohs(lacpdu->actor_key);
 507                 partner->port_state = lacpdu->actor_state;
 508
 509                 // set actor_oper_port_state.defaulted to FALSE
 510                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 511
 512                 // set the partner sync. to on if the partner is sync. and the port is matched
 513                 if ((port->sm_vars & AD_PORT_MATCHED)
 514                     && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
 515                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 516                 else
 517                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 518         }
 519 }
 520
 521 /**
 522  * __record_default - record default parameters
 523  * @port: the port we're looking at
 524  *
 525  * This function records the default parameter values for the partner carried
 526  * in the Partner Admin parameters as the current partner operational parameter
 527  * values and sets actor_oper_port_state.defaulted to TRUE.
 528  */
 529 static void __record_default(struct port *port)
 530 {
 531         if (port) {
 532                 // record the partner admin parameters
 533                 memcpy(&port->partner_oper, &port->partner_admin,
 534                        sizeof(struct port_params));
 535
 536                 // set actor_oper_port_state.defaulted to true
 537                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 538         }
 539 }
 540
 541 /**
 542  * __update_selected - update a port's Selected variable from a received lacpdu
 543  * @lacpdu: the lacpdu we've received
 544  * @port: the port we're looking at
 545  *
 546  * Update the value of the selected variable, using parameter values from a
 547  * newly received lacpdu. The parameter values for the Actor carried in the
 548  * received PDU are compared with the corresponding operational parameter
 549  * values for the ports partner. If one or more of the comparisons shows that
 550  * the value(s) received in the PDU differ from the current operational values,
 551  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 552  * set to out_of_sync. Otherwise, selected remains unchanged.
 553  */
 554 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 555 {
 556         if (lacpdu && port) {
 557                 const struct port_params *partner = &port->partner_oper;
 558
 559                 // check if any parameter is different
 560                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 561                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 562                     MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system) ||
 563                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 564                     ntohs(lacpdu->actor_key) != partner->key ||
 565                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 566                         // update the state machine Selected variable
 567                         port->sm_vars &= ~AD_PORT_SELECTED;
 568                 }
 569         }
 570 }
 571
 572 /**
 573  * __update_default_selected - update a port's Selected variable from Partner
 574  * @port: the port we're looking at
 575  *
 576  * This function updates the value of the selected variable, using the partner
 577  * administrative parameter values. The administrative values are compared with
 578  * the corresponding operational parameter values for the partner. If one or
 579  * more of the comparisons shows that the administrative value(s) differ from
 580  * the current operational values, then Selected is set to FALSE and
 581  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 582  * Selected remains unchanged.
 583  */
 584 static void __update_default_selected(struct port *port)
 585 {
 586         if (port) {
 587                 const struct port_params *admin = &port->partner_admin;
 588                 const struct port_params *oper = &port->partner_oper;
 589
 590                 // check if any parameter is different
 591                 if (admin->port_number != oper->port_number ||
 592                     admin->port_priority != oper->port_priority ||
 593                     MAC_ADDRESS_COMPARE(&admin->system, &oper->system) ||
 594                     admin->system_priority != oper->system_priority ||
 595                     admin->key != oper->key ||
 596                     (admin->port_state & AD_STATE_AGGREGATION)
 597                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 598                         // update the state machine Selected variable
 599                         port->sm_vars &= ~AD_PORT_SELECTED;
 600                 }
 601         }
 602 }
 603
 604 /**
 605  * __update_ntt - update a port's ntt variable from a received lacpdu
 606  * @lacpdu: the lacpdu we've received
 607  * @port: the port we're looking at
 608  *
 609  * Updates the value of the ntt variable, using parameter values from a newly
 610  * received lacpdu. The parameter values for the partner carried in the
 611  * received PDU are compared with the corresponding operational parameter
 612  * values for the Actor. If one or more of the comparisons shows that the
 613  * value(s) received in the PDU differ from the current operational values,
 614  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 615  */
 616 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 617 {
 618         // validate lacpdu and port
 619         if (lacpdu && port) {
 620                 // check if any parameter is different
 621                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 622                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 623                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 624                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 625                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 626                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 627                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 628                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 629                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 630                    ) {
 631
 632                         port->ntt = true;
 633                 }
 634         }
 635 }
 636
 637 /**
 638  * __attach_bond_to_agg
 639  * @port: the port we're looking at
 640  *
 641  * Handle the attaching of the port's control parser/multiplexer and the
 642  * aggregator. This function does nothing since the parser/multiplexer of the
 643  * receive and the parser/multiplexer of the aggregator are already combined.
 644  */
 645 static void __attach_bond_to_agg(struct port *port)
 646 {
 647         port = NULL; /* just to satisfy the compiler */
 648         // This function does nothing since the parser/multiplexer of the receive
 649         // and the parser/multiplexer of the aggregator are already combined
 650 }
 651
 652 /**
 653  * __detach_bond_from_agg
 654  * @port: the port we're looking at
 655  *
 656  * Handle the detaching of the port's control parser/multiplexer from the
 657  * aggregator. This function does nothing since the parser/multiplexer of the
 658  * receive and the parser/multiplexer of the aggregator are already combined.
 659  */
 660 static void __detach_bond_from_agg(struct port *port)
 661 {
 662         port = NULL; /* just to satisfy the compiler */
 663         // This function does nothing sience the parser/multiplexer of the receive
 664         // and the parser/multiplexer of the aggregator are already combined
 665 }
 666
 667 /**
 668  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 669  * @aggregator: the aggregator we're looking at
 670  *
 671  */
 672 static int __agg_ports_are_ready(struct aggregator *aggregator)
 673 {
 674         struct port *port;
 675         int retval = 1;
 676
 677         if (aggregator) {
 678                 // scan all ports in this aggregator to verfy if they are all ready
 679                 for (port = aggregator->lag_ports;
 680                      port;
 681                      port = port->next_port_in_aggregator) {
 682                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 683                                 retval = 0;
 684                                 break;
 685                         }
 686                 }
 687         }
 688
 689         return retval;
 690 }
 691
 692 /**
 693  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 694  * @aggregator: the aggregator we're looking at
 695  * @val: Should the ports' ready bit be set on or off
 696  *
 697  */
 698 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 699 {
 700         struct port *port;
 701
 702         for (port = aggregator->lag_ports; port;
 703              port = port->next_port_in_aggregator) {
 704                 if (val)
 705                         port->sm_vars |= AD_PORT_READY;
 706                 else
 707                         port->sm_vars &= ~AD_PORT_READY;
 708         }
 709 }
 710
 711 /**
 712  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 713  * @aggregator: the aggregator we're looking at
 714  *
 715  */
 716 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 717 {
 718         u32 bandwidth = 0;
 719         u32 basic_speed;
 720
 721         if (aggregator->num_of_ports) {
 722                 basic_speed = __get_link_speed(aggregator->lag_ports);
 723                 switch (basic_speed) {
 724                 case AD_LINK_SPEED_BITMASK_1MBPS:
 725                         bandwidth = aggregator->num_of_ports;
 726                         break;
 727                 case AD_LINK_SPEED_BITMASK_10MBPS:
 728                         bandwidth = aggregator->num_of_ports * 10;
 729                         break;
 730                 case AD_LINK_SPEED_BITMASK_100MBPS:
 731                         bandwidth = aggregator->num_of_ports * 100;
 732                         break;
 733                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 734                         bandwidth = aggregator->num_of_ports * 1000;
 735                         break;
 736                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 737                         bandwidth = aggregator->num_of_ports * 10000;
 738                         break;
 739                 default:
 740                         bandwidth = 0; /*to silence the compiler ....*/
 741                 }
 742         }
 743         return bandwidth;
 744 }
 745
 746 /**
 747  * __get_active_agg - get the current active aggregator
 748  * @aggregator: the aggregator we're looking at
 749  *
 750  */
 751 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 752 {
 753         struct aggregator *retval = NULL;
 754
 755         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
 756                 if (aggregator->is_active) {
 757                         retval = aggregator;
 758                         break;
 759                 }
 760         }
 761
 762         return retval;
 763 }
 764
 765 /**
 766  * __update_lacpdu_from_port - update a port's lacpdu fields
 767  * @port: the port we're looking at
 768  *
 769  */
 770 static inline void __update_lacpdu_from_port(struct port *port)
 771 {
 772         struct lacpdu *lacpdu = &port->lacpdu;
 773         const struct port_params *partner = &port->partner_oper;
 774
 775         /* update current actual Actor parameters */
 776         /* lacpdu->subtype                   initialized
 777          * lacpdu->version_number            initialized
 778          * lacpdu->tlv_type_actor_info       initialized
 779          * lacpdu->actor_information_length  initialized
 780          */
 781
 782         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 783         lacpdu->actor_system = port->actor_system;
 784         lacpdu->actor_key = htons(port->actor_oper_port_key);
 785         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 786         lacpdu->actor_port = htons(port->actor_port_number);
 787         lacpdu->actor_state = port->actor_oper_port_state;
 788
 789         /* lacpdu->reserved_3_1              initialized
 790          * lacpdu->tlv_type_partner_info     initialized
 791          * lacpdu->partner_information_length initialized
 792          */
 793
 794         lacpdu->partner_system_priority = htons(partner->system_priority);
 795         lacpdu->partner_system = partner->system;
 796         lacpdu->partner_key = htons(partner->key);
 797         lacpdu->partner_port_priority = htons(partner->port_priority);
 798         lacpdu->partner_port = htons(partner->port_number);
 799         lacpdu->partner_state = partner->port_state;
 800
 801         /* lacpdu->reserved_3_2              initialized
 802          * lacpdu->tlv_type_collector_info   initialized
 803          * lacpdu->collector_information_length initialized
 804          * collector_max_delay                initialized
 805          * reserved_12[12]                   initialized
 806          * tlv_type_terminator               initialized
 807          * terminator_length                 initialized
 808          * reserved_50[50]                   initialized
 809          */
 810 }
 811
 812 //////////////////////////////////////////////////////////////////////////////////////
 813 // ================= main 802.3ad protocol code ======================================
 814 //////////////////////////////////////////////////////////////////////////////////////
 815
 816 /**
 817  * ad_lacpdu_send - send out a lacpdu packet on a given port
 818  * @port: the port we're looking at
 819  *
 820  * Returns:   0 on success
 821  *          < 0 on error
 822  */
 823 static int ad_lacpdu_send(struct port *port)
 824 {
 825         struct slave *slave = port->slave;
 826         struct sk_buff *skb;
 827         struct lacpdu_header *lacpdu_header;
 828         int length = sizeof(struct lacpdu_header);
 829
 830         skb = dev_alloc_skb(length);
 831         if (!skb)
 832                 return -ENOMEM;
 833
 834         skb->dev = slave->dev;
 835         skb_reset_mac_header(skb);
 836         skb->network_header = skb->mac_header + ETH_HLEN;
 837         skb->protocol = PKT_TYPE_LACPDU;
 838         skb->priority = TC_PRIO_CONTROL;
 839
 840         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 841
 842         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 843         /* Note: source addres is set to be the member's PERMANENT address,
 844            because we use it to identify loopback lacpdus in receive. */
 845         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 846         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 847
 848         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 849
 850         dev_queue_xmit(skb);
 851
 852         return 0;
 853 }
 854
 855 /**
 856  * ad_marker_send - send marker information/response on a given port
 857  * @port: the port we're looking at
 858  * @marker: marker data to send
 859  *
 860  * Returns:   0 on success
 861  *          < 0 on error
 862  */
 863 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 864 {
 865         struct slave *slave = port->slave;
 866         struct sk_buff *skb;
 867         struct bond_marker_header *marker_header;
 868         int length = sizeof(struct bond_marker_header);
 869
 870         skb = dev_alloc_skb(length + 16);
 871         if (!skb)
 872                 return -ENOMEM;
 873
 874         skb_reserve(skb, 16);
 875
 876         skb->dev = slave->dev;
 877         skb_reset_mac_header(skb);
 878         skb->network_header = skb->mac_header + ETH_HLEN;
 879         skb->protocol = PKT_TYPE_LACPDU;
 880
 881         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 882
 883         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 884         /* Note: source addres is set to be the member's PERMANENT address,
 885            because we use it to identify loopback MARKERs in receive. */
 886         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 887         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 888
 889         marker_header->marker = *marker; // struct copy
 890
 891         dev_queue_xmit(skb);
 892
 893         return 0;
 894 }
 895
 896 /**
 897  * ad_mux_machine - handle a port's mux state machine
 898  * @port: the port we're looking at
 899  *
 900  */
 901 static void ad_mux_machine(struct port *port)
 902 {
 903         mux_states_t last_state;
 904
 905         // keep current State Machine state to compare later if it was changed
 906         last_state = port->sm_mux_state;
 907
 908         if (port->sm_vars & AD_PORT_BEGIN) {
 909                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 910         } else {
 911                 switch (port->sm_mux_state) {
 912                 case AD_MUX_DETACHED:
 913                         if ((port->sm_vars & AD_PORT_SELECTED)
 914                             || (port->sm_vars & AD_PORT_STANDBY))
 915                                 /* if SELECTED or STANDBY */
 916                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 917                         break;
 918                 case AD_MUX_WAITING:
 919                         // if SELECTED == FALSE return to DETACH state
 920                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 921                                 port->sm_vars &= ~AD_PORT_READY_N;
 922                                 // in order to withhold the Selection Logic to check all ports READY_N value
 923                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 924                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 925                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 926                                 break;
 927                         }
 928
 929                         // check if the wait_while_timer expired
 930                         if (port->sm_mux_timer_counter
 931                             && !(--port->sm_mux_timer_counter))
 932                                 port->sm_vars |= AD_PORT_READY_N;
 933
 934                         // in order to withhold the selection logic to check all ports READY_N value
 935                         // every callback cycle to update ready variable, we check READY_N and update READY here
 936                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 937
 938                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 939                         if ((port->sm_vars & AD_PORT_READY)
 940                             && !port->sm_mux_timer_counter)
 941                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 942                         break;
 943                 case AD_MUX_ATTACHED:
 944                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 945                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 946                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 947                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 948                                 port->sm_vars &= ~AD_PORT_READY_N;
 949                                 // in order to withhold the selection logic to check all ports READY_N value
 950                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 951                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 952                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 953                         }
 954                         break;
 955                 case AD_MUX_COLLECTING_DISTRIBUTING:
 956                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 957                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 958                            ) {
 959                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 960
 961                         } else {
 962                                 // if port state hasn't changed make
 963                                 // sure that a collecting distributing
 964                                 // port in an active aggregator is enabled
 965                                 if (port->aggregator &&
 966                                     port->aggregator->is_active &&
 967                                     !__port_is_enabled(port)) {
 968
 969                                         __enable_port(port);
 970                                 }
 971                         }
 972                         break;
 973                 default:    //to silence the compiler
 974                         break;
 975                 }
 976         }
 977
 978         // check if the state machine was changed
 979         if (port->sm_mux_state != last_state) {
 980                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
 981                          port->actor_port_number, last_state,
 982                          port->sm_mux_state);
 983                 switch (port->sm_mux_state) {
 984                 case AD_MUX_DETACHED:
 985                         __detach_bond_from_agg(port);
 986                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 987                         ad_disable_collecting_distributing(port);
 988                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 989                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 990                         port->ntt = true;
 991                         break;
 992                 case AD_MUX_WAITING:
 993                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 994                         break;
 995                 case AD_MUX_ATTACHED:
 996                         __attach_bond_to_agg(port);
 997                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 998                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 999                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1000                         ad_disable_collecting_distributing(port);
1001                         port->ntt = true;
1002                         break;
1003                 case AD_MUX_COLLECTING_DISTRIBUTING:
1004                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1005                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1006                         ad_enable_collecting_distributing(port);
1007                         port->ntt = true;
1008                         break;
1009                 default:    //to silence the compiler
1010                         break;
1011                 }
1012         }
1013 }
1014
1015 /**
1016  * ad_rx_machine - handle a port's rx State Machine
1017  * @lacpdu: the lacpdu we've received
1018  * @port: the port we're looking at
1019  *
1020  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1021  * CURRENT. If timer expired set the state machine in the proper state.
1022  * In other cases, this function checks if we need to switch to other state.
1023  */
1024 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1025 {
1026         rx_states_t last_state;
1027
1028         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1029         __get_rx_machine_lock(port);
1030
1031         // keep current State Machine state to compare later if it was changed
1032         last_state = port->sm_rx_state;
1033
1034         // check if state machine should change state
1035         // first, check if port was reinitialized
1036         if (port->sm_vars & AD_PORT_BEGIN)
1037                 /* next state */
1038                 port->sm_rx_state = AD_RX_INITIALIZE;
1039         // check if port is not enabled
1040         else if (!(port->sm_vars & AD_PORT_BEGIN)
1041                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1042                 /* next state */
1043                 port->sm_rx_state = AD_RX_PORT_DISABLED;
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
1068                                          && (port->sm_vars
1069                                              & AD_PORT_LACP_ENABLED))
1070                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1071                                 else if (port->is_enabled
1072                                          && ((port->sm_vars
1073                                               & AD_PORT_LACP_ENABLED) == 0))
1074                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1075                                 break;
1076                         default:    //to silence the compiler
1077                                 break;
1078
1079                         }
1080                 }
1081         }
1082
1083         // check if the State machine was changed or new lacpdu arrived
1084         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1085                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1086                          port->actor_port_number, last_state,
1087                          port->sm_rx_state);
1088                 switch (port->sm_rx_state) {
1089                 case AD_RX_INITIALIZE:
1090                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1091                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1092                         else
1093                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1094                         port->sm_vars &= ~AD_PORT_SELECTED;
1095                         __record_default(port);
1096                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1097                         port->sm_vars &= ~AD_PORT_MOVED;
1098                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1099
1100                         /*- Fall Through -*/
1101
1102                 case AD_RX_PORT_DISABLED:
1103                         port->sm_vars &= ~AD_PORT_MATCHED;
1104                         break;
1105                 case AD_RX_LACP_DISABLED:
1106                         port->sm_vars &= ~AD_PORT_SELECTED;
1107                         __record_default(port);
1108                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1109                         port->sm_vars |= AD_PORT_MATCHED;
1110                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1111                         break;
1112                 case AD_RX_EXPIRED:
1113                         //Reset of the Synchronization flag. (Standard 43.4.12)
1114                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1115                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1116                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1117                         port->sm_vars &= ~AD_PORT_MATCHED;
1118                         port->partner_oper.port_state |=
1119                                 AD_STATE_LACP_ACTIVITY;
1120                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1121                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1122                         break;
1123                 case AD_RX_DEFAULTED:
1124                         __update_default_selected(port);
1125                         __record_default(port);
1126                         port->sm_vars |= AD_PORT_MATCHED;
1127                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1128                         break;
1129                 case AD_RX_CURRENT:
1130                         // detect loopback situation
1131                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1132                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1133                                 pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
1134                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1135                                        port->slave->dev->master->name, port->slave->dev->name);
1136                                 __release_rx_machine_lock(port);
1137                                 return;
1138                         }
1139                         __update_selected(lacpdu, port);
1140                         __update_ntt(lacpdu, port);
1141                         __record_pdu(lacpdu, port);
1142                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1143                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1144                         // verify that if the aggregator is enabled, the port is enabled too.
1145                         //(because if the link goes down for a short time, the 802.3ad will not
1146                         // catch it, and the port will continue to be disabled)
1147                         if (port->aggregator
1148                             && port->aggregator->is_active
1149                             && !__port_is_enabled(port))
1150                                 __enable_port(port);
1151                         break;
1152                 default:    //to silence the compiler
1153                         break;
1154                 }
1155         }
1156         __release_rx_machine_lock(port);
1157 }
1158
1159 /**
1160  * ad_tx_machine - handle a port's tx state machine
1161  * @port: the port we're looking at
1162  *
1163  */
1164 static void ad_tx_machine(struct port *port)
1165 {
1166         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1167         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1168                 // check if there is something to send
1169                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1170                         __update_lacpdu_from_port(port);
1171
1172                         if (ad_lacpdu_send(port) >= 0) {
1173                                 pr_debug("Sent LACPDU on port %d\n",
1174                                          port->actor_port_number);
1175
1176                                 /* mark ntt as false, so it will not be sent again until
1177                                    demanded */
1178                                 port->ntt = false;
1179                         }
1180                 }
1181                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1182                 port->sm_tx_timer_counter =
1183                         ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1184         }
1185 }
1186
1187 /**
1188  * ad_periodic_machine - handle a port's periodic state machine
1189  * @port: the port we're looking at
1190  *
1191  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1192  */
1193 static void ad_periodic_machine(struct port *port)
1194 {
1195         periodic_states_t last_state;
1196
1197         // keep current state machine state to compare later if it was changed
1198         last_state = port->sm_periodic_state;
1199
1200         // check if port was reinitialized
1201         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1202             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1203            ) {
1204                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1205         }
1206         // check if state machine should change state
1207         else if (port->sm_periodic_timer_counter) {
1208                 // check if periodic state machine expired
1209                 if (!(--port->sm_periodic_timer_counter)) {
1210                         // if expired then do tx
1211                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1212                 } else {
1213                         // If not expired, check if there is some new timeout parameter from the partner state
1214                         switch (port->sm_periodic_state) {
1215                         case AD_FAST_PERIODIC:
1216                                 if (!(port->partner_oper.port_state
1217                                       & AD_STATE_LACP_TIMEOUT))
1218                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1219                                 break;
1220                         case AD_SLOW_PERIODIC:
1221                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1222                                         // stop current timer
1223                                         port->sm_periodic_timer_counter = 0;
1224                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1225                                 }
1226                                 break;
1227                         default:    //to silence the compiler
1228                                 break;
1229                         }
1230                 }
1231         } else {
1232                 switch (port->sm_periodic_state) {
1233                 case AD_NO_PERIODIC:
1234                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1235                         break;
1236                 case AD_PERIODIC_TX:
1237                         if (!(port->partner_oper.port_state
1238                               & AD_STATE_LACP_TIMEOUT))
1239                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1240                         else
1241                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1242                         break;
1243                 default:    //to silence the compiler
1244                         break;
1245                 }
1246         }
1247
1248         // check if the state machine was changed
1249         if (port->sm_periodic_state != last_state) {
1250                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1251                          port->actor_port_number, last_state,
1252                          port->sm_periodic_state);
1253                 switch (port->sm_periodic_state) {
1254                 case AD_NO_PERIODIC:
1255                         port->sm_periodic_timer_counter = 0;       // zero timer
1256                         break;
1257                 case AD_FAST_PERIODIC:
1258                         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
1259                         break;
1260                 case AD_SLOW_PERIODIC:
1261                         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
1262                         break;
1263                 case AD_PERIODIC_TX:
1264                         port->ntt = true;
1265                         break;
1266                 default:    //to silence the compiler
1267                         break;
1268                 }
1269         }
1270 }
1271
1272 /**
1273  * ad_port_selection_logic - select aggregation groups
1274  * @port: the port we're looking at
1275  *
1276  * Select aggregation groups, and assign each port for it's aggregetor. The
1277  * selection logic is called in the inititalization (after all the handshkes),
1278  * and after every lacpdu receive (if selected is off).
1279  */
1280 static void ad_port_selection_logic(struct port *port)
1281 {
1282         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1283         struct port *last_port = NULL, *curr_port;
1284         int found = 0;
1285
1286         // if the port is already Selected, do nothing
1287         if (port->sm_vars & AD_PORT_SELECTED)
1288                 return;
1289
1290         // if the port is connected to other aggregator, detach it
1291         if (port->aggregator) {
1292                 // detach the port from its former aggregator
1293                 temp_aggregator = port->aggregator;
1294                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1295                      last_port = curr_port,
1296                              curr_port = curr_port->next_port_in_aggregator) {
1297                         if (curr_port == port) {
1298                                 temp_aggregator->num_of_ports--;
1299                                 if (!last_port) {// if it is the first port attached to the aggregator
1300                                         temp_aggregator->lag_ports =
1301                                                 port->next_port_in_aggregator;
1302                                 } else {// not the first port attached to the aggregator
1303                                         last_port->next_port_in_aggregator =
1304                                                 port->next_port_in_aggregator;
1305                                 }
1306
1307                                 // clear the port's relations to this aggregator
1308                                 port->aggregator = NULL;
1309                                 port->next_port_in_aggregator = NULL;
1310                                 port->actor_port_aggregator_identifier = 0;
1311
1312                                 pr_debug("Port %d left LAG %d\n",
1313                                          port->actor_port_number,
1314                                          temp_aggregator->aggregator_identifier);
1315                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1316                                 if (!temp_aggregator->lag_ports)
1317                                         ad_clear_agg(temp_aggregator);
1318                                 break;
1319                         }
1320                 }
1321                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1322                         pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1323                                    port->slave->dev->master->name,
1324                                    port->actor_port_number,
1325                                    port->slave->dev->name,
1326                                    port->aggregator->aggregator_identifier);
1327                 }
1328         }
1329         // search on all aggregators for a suitable aggregator for this port
1330         for (aggregator = __get_first_agg(port); aggregator;
1331              aggregator = __get_next_agg(aggregator)) {
1332
1333                 // keep a free aggregator for later use(if needed)
1334                 if (!aggregator->lag_ports) {
1335                         if (!free_aggregator)
1336                                 free_aggregator = aggregator;
1337                         continue;
1338                 }
1339                 // check if current aggregator suits us
1340                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1341                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1342                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1343                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1344                     ) &&
1345                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1346                       !aggregator->is_individual)  // but is not individual OR
1347                     )
1348                    ) {
1349                         // attach to the founded aggregator
1350                         port->aggregator = aggregator;
1351                         port->actor_port_aggregator_identifier =
1352                                 port->aggregator->aggregator_identifier;
1353                         port->next_port_in_aggregator = aggregator->lag_ports;
1354                         port->aggregator->num_of_ports++;
1355                         aggregator->lag_ports = port;
1356                         pr_debug("Port %d joined LAG %d(existing LAG)\n",
1357                                  port->actor_port_number,
1358                                  port->aggregator->aggregator_identifier);
1359
1360                         // mark this port as selected
1361                         port->sm_vars |= AD_PORT_SELECTED;
1362                         found = 1;
1363                         break;
1364                 }
1365         }
1366
1367         // the port couldn't find an aggregator - attach it to a new aggregator
1368         if (!found) {
1369                 if (free_aggregator) {
1370                         // assign port a new aggregator
1371                         port->aggregator = free_aggregator;
1372                         port->actor_port_aggregator_identifier =
1373                                 port->aggregator->aggregator_identifier;
1374
1375                         // update the new aggregator's parameters
1376                         // if port was responsed from the end-user
1377                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1378                                 /* if port is full duplex */
1379                                 port->aggregator->is_individual = false;
1380                         else
1381                                 port->aggregator->is_individual = true;
1382
1383                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1384                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1385                         port->aggregator->partner_system =
1386                                 port->partner_oper.system;
1387                         port->aggregator->partner_system_priority =
1388                                 port->partner_oper.system_priority;
1389                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1390                         port->aggregator->receive_state = 1;
1391                         port->aggregator->transmit_state = 1;
1392                         port->aggregator->lag_ports = port;
1393                         port->aggregator->num_of_ports++;
1394
1395                         // mark this port as selected
1396                         port->sm_vars |= AD_PORT_SELECTED;
1397
1398                         pr_debug("Port %d joined LAG %d(new LAG)\n",
1399                                  port->actor_port_number,
1400                                  port->aggregator->aggregator_identifier);
1401                 } else {
1402                         pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1403                                port->slave->dev->master->name,
1404                                port->actor_port_number, port->slave->dev->name);
1405                 }
1406         }
1407         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1408         // else set ready=FALSE in all aggregator's ports
1409         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1410
1411         aggregator = __get_first_agg(port);
1412         ad_agg_selection_logic(aggregator);
1413 }
1414
1415 /*
1416  * Decide if "agg" is a better choice for the new active aggregator that
1417  * the current best, according to the ad_select policy.
1418  */
1419 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1420                                                 struct aggregator *curr)
1421 {
1422         /*
1423          * 0. If no best, select current.
1424          *
1425          * 1. If the current agg is not individual, and the best is
1426          *    individual, select current.
1427          *
1428          * 2. If current agg is individual and the best is not, keep best.
1429          *
1430          * 3. Therefore, current and best are both individual or both not
1431          *    individual, so:
1432          *
1433          * 3a. If current agg partner replied, and best agg partner did not,
1434          *     select current.
1435          *
1436          * 3b. If current agg partner did not reply and best agg partner
1437          *     did reply, keep best.
1438          *
1439          * 4.  Therefore, current and best both have partner replies or
1440          *     both do not, so perform selection policy:
1441          *
1442          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1443          *     select by bandwidth.
1444          *
1445          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1446          */
1447         if (!best)
1448                 return curr;
1449
1450         if (!curr->is_individual && best->is_individual)
1451                 return curr;
1452
1453         if (curr->is_individual && !best->is_individual)
1454                 return best;
1455
1456         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1457                 return curr;
1458
1459         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1460                 return best;
1461
1462         switch (__get_agg_selection_mode(curr->lag_ports)) {
1463         case BOND_AD_COUNT:
1464                 if (curr->num_of_ports > best->num_of_ports)
1465                         return curr;
1466
1467                 if (curr->num_of_ports < best->num_of_ports)
1468                         return best;
1469
1470                 /*FALLTHROUGH*/
1471         case BOND_AD_STABLE:
1472         case BOND_AD_BANDWIDTH:
1473                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1474                         return curr;
1475
1476                 break;
1477
1478         default:
1479                 pr_warning("%s: Impossible agg select mode %d\n",
1480                            curr->slave->dev->master->name,
1481                            __get_agg_selection_mode(curr->lag_ports));
1482                 break;
1483         }
1484
1485         return best;
1486 }
1487
1488 static int agg_device_up(const struct aggregator *agg)
1489 {
1490         return (netif_running(agg->slave->dev) &&
1491                 netif_carrier_ok(agg->slave->dev));
1492 }
1493
1494 /**
1495  * ad_agg_selection_logic - select an aggregation group for a team
1496  * @aggregator: the aggregator we're looking at
1497  *
1498  * It is assumed that only one aggregator may be selected for a team.
1499  *
1500  * The logic of this function is to select the aggregator according to
1501  * the ad_select policy:
1502  *
1503  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1504  * it, and to reselect the active aggregator only if the previous
1505  * aggregator has no more ports related to it.
1506  *
1507  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1508  * bandwidth, and reselect whenever a link state change takes place or the
1509  * set of slaves in the bond changes.
1510  *
1511  * BOND_AD_COUNT: select the aggregator with largest number of ports
1512  * (slaves), and reselect whenever a link state change takes place or the
1513  * set of slaves in the bond changes.
1514  *
1515  * FIXME: this function MUST be called with the first agg in the bond, or
1516  * __get_active_agg() won't work correctly. This function should be better
1517  * called with the bond itself, and retrieve the first agg from it.
1518  */
1519 static void ad_agg_selection_logic(struct aggregator *agg)
1520 {
1521         struct aggregator *best, *active, *origin;
1522         struct port *port;
1523
1524         origin = agg;
1525         active = __get_active_agg(agg);
1526         best = (active && agg_device_up(active)) ? active : NULL;
1527
1528         do {
1529                 agg->is_active = 0;
1530
1531                 if (agg->num_of_ports && agg_device_up(agg))
1532                         best = ad_agg_selection_test(best, agg);
1533
1534         } while ((agg = __get_next_agg(agg)));
1535
1536         if (best &&
1537             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1538                 /*
1539                  * For the STABLE policy, don't replace the old active
1540                  * aggregator if it's still active (it has an answering
1541                  * partner) or if both the best and active don't have an
1542                  * answering partner.
1543                  */
1544                 if (active && active->lag_ports &&
1545                     active->lag_ports->is_enabled &&
1546                     (__agg_has_partner(active) ||
1547                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1548                         if (!(!active->actor_oper_aggregator_key &&
1549                               best->actor_oper_aggregator_key)) {
1550                                 best = NULL;
1551                                 active->is_active = 1;
1552                         }
1553                 }
1554         }
1555
1556         if (best && (best == active)) {
1557                 best = NULL;
1558                 active->is_active = 1;
1559         }
1560
1561         // if there is new best aggregator, activate it
1562         if (best) {
1563                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1564                          best->aggregator_identifier, best->num_of_ports,
1565                          best->actor_oper_aggregator_key,
1566                          best->partner_oper_aggregator_key,
1567                          best->is_individual, best->is_active);
1568                 pr_debug("best ports %p slave %p %s\n",
1569                          best->lag_ports, best->slave,
1570                          best->slave ? best->slave->dev->name : "NULL");
1571
1572                 for (agg = __get_first_agg(best->lag_ports); agg;
1573                      agg = __get_next_agg(agg)) {
1574
1575                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1576                                  agg->aggregator_identifier, agg->num_of_ports,
1577                                  agg->actor_oper_aggregator_key,
1578                                  agg->partner_oper_aggregator_key,
1579                                  agg->is_individual, agg->is_active);
1580                 }
1581
1582                 // check if any partner replys
1583                 if (best->is_individual) {
1584                         pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1585                                    best->slave ? best->slave->dev->master->name : "NULL");
1586                 }
1587
1588                 best->is_active = 1;
1589                 pr_debug("LAG %d chosen as the active LAG\n",
1590                          best->aggregator_identifier);
1591                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1592                          best->aggregator_identifier, best->num_of_ports,
1593                          best->actor_oper_aggregator_key,
1594                          best->partner_oper_aggregator_key,
1595                          best->is_individual, best->is_active);
1596
1597                 // disable the ports that were related to the former active_aggregator
1598                 if (active) {
1599                         for (port = active->lag_ports; port;
1600                              port = port->next_port_in_aggregator) {
1601                                 __disable_port(port);
1602                         }
1603                 }
1604         }
1605
1606         /*
1607          * if the selected aggregator is of join individuals
1608          * (partner_system is NULL), enable their ports
1609          */
1610         active = __get_active_agg(origin);
1611
1612         if (active) {
1613                 if (!__agg_has_partner(active)) {
1614                         for (port = active->lag_ports; port;
1615                              port = port->next_port_in_aggregator) {
1616                                 __enable_port(port);
1617                         }
1618                 }
1619         }
1620
1621         if (origin->slave) {
1622                 struct bonding *bond;
1623
1624                 bond = bond_get_bond_by_slave(origin->slave);
1625                 if (bond)
1626                         bond_3ad_set_carrier(bond);
1627         }
1628 }
1629
1630 /**
1631  * ad_clear_agg - clear a given aggregator's parameters
1632  * @aggregator: the aggregator we're looking at
1633  *
1634  */
1635 static void ad_clear_agg(struct aggregator *aggregator)
1636 {
1637         if (aggregator) {
1638                 aggregator->is_individual = false;
1639                 aggregator->actor_admin_aggregator_key = 0;
1640                 aggregator->actor_oper_aggregator_key = 0;
1641                 aggregator->partner_system = null_mac_addr;
1642                 aggregator->partner_system_priority = 0;
1643                 aggregator->partner_oper_aggregator_key = 0;
1644                 aggregator->receive_state = 0;
1645                 aggregator->transmit_state = 0;
1646                 aggregator->lag_ports = NULL;
1647                 aggregator->is_active = 0;
1648                 aggregator->num_of_ports = 0;
1649                 pr_debug("LAG %d was cleared\n",
1650                          aggregator->aggregator_identifier);
1651         }
1652 }
1653
1654 /**
1655  * ad_initialize_agg - initialize a given aggregator's parameters
1656  * @aggregator: the aggregator we're looking at
1657  *
1658  */
1659 static void ad_initialize_agg(struct aggregator *aggregator)
1660 {
1661         if (aggregator) {
1662                 ad_clear_agg(aggregator);
1663
1664                 aggregator->aggregator_mac_address = null_mac_addr;
1665                 aggregator->aggregator_identifier = 0;
1666                 aggregator->slave = NULL;
1667         }
1668 }
1669
1670 /**
1671  * ad_initialize_port - initialize a given port's parameters
1672  * @aggregator: the aggregator we're looking at
1673  * @lacp_fast: boolean. whether fast periodic should be used
1674  *
1675  */
1676 static void ad_initialize_port(struct port *port, int lacp_fast)
1677 {
1678         static const struct port_params tmpl = {
1679                 .system_priority = 0xffff,
1680                 .key             = 1,
1681                 .port_number     = 1,
1682                 .port_priority   = 0xff,
1683                 .port_state      = 1,
1684         };
1685         static const struct lacpdu lacpdu = {
1686                 .subtype                = 0x01,
1687                 .version_number = 0x01,
1688                 .tlv_type_actor_info = 0x01,
1689                 .actor_information_length = 0x14,
1690                 .tlv_type_partner_info = 0x02,
1691                 .partner_information_length = 0x14,
1692                 .tlv_type_collector_info = 0x03,
1693                 .collector_information_length = 0x10,
1694                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1695         };
1696
1697         if (port) {
1698                 port->actor_port_number = 1;
1699                 port->actor_port_priority = 0xff;
1700                 port->actor_system = null_mac_addr;
1701                 port->actor_system_priority = 0xffff;
1702                 port->actor_port_aggregator_identifier = 0;
1703                 port->ntt = false;
1704                 port->actor_admin_port_key = 1;
1705                 port->actor_oper_port_key  = 1;
1706                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1707                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1708
1709                 if (lacp_fast)
1710                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1711
1712                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1713                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1714
1715                 port->is_enabled = true;
1716                 // ****** private parameters ******
1717                 port->sm_vars = 0x3;
1718                 port->sm_rx_state = 0;
1719                 port->sm_rx_timer_counter = 0;
1720                 port->sm_periodic_state = 0;
1721                 port->sm_periodic_timer_counter = 0;
1722                 port->sm_mux_state = 0;
1723                 port->sm_mux_timer_counter = 0;
1724                 port->sm_tx_state = 0;
1725                 port->sm_tx_timer_counter = 0;
1726                 port->slave = NULL;
1727                 port->aggregator = NULL;
1728                 port->next_port_in_aggregator = NULL;
1729                 port->transaction_id = 0;
1730
1731                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1732         }
1733 }
1734
1735 /**
1736  * ad_enable_collecting_distributing - enable a port's transmit/receive
1737  * @port: the port we're looking at
1738  *
1739  * Enable @port if it's in an active aggregator
1740  */
1741 static void ad_enable_collecting_distributing(struct port *port)
1742 {
1743         if (port->aggregator->is_active) {
1744                 pr_debug("Enabling port %d(LAG %d)\n",
1745                          port->actor_port_number,
1746                          port->aggregator->aggregator_identifier);
1747                 __enable_port(port);
1748         }
1749 }
1750
1751 /**
1752  * ad_disable_collecting_distributing - disable a port's transmit/receive
1753  * @port: the port we're looking at
1754  *
1755  */
1756 static void ad_disable_collecting_distributing(struct port *port)
1757 {
1758         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1759                 pr_debug("Disabling port %d(LAG %d)\n",
1760                          port->actor_port_number,
1761                          port->aggregator->aggregator_identifier);
1762                 __disable_port(port);
1763         }
1764 }
1765
1766 #if 0
1767 /**
1768  * ad_marker_info_send - send a marker information frame
1769  * @port: the port we're looking at
1770  *
1771  * This function does nothing since we decided not to implement send and handle
1772  * response for marker PDU's, in this stage, but only to respond to marker
1773  * information.
1774  */
1775 static void ad_marker_info_send(struct port *port)
1776 {
1777         struct bond_marker marker;
1778         u16 index;
1779
1780         // fill the marker PDU with the appropriate values
1781         marker.subtype = 0x02;
1782         marker.version_number = 0x01;
1783         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1784         marker.marker_length = 0x16;
1785         // convert requester_port to Big Endian
1786         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1787         marker.requester_system = port->actor_system;
1788         // convert requester_port(u32) to Big Endian
1789         marker.requester_transaction_id =
1790                 (((++port->transaction_id & 0xFF) << 24)
1791                  | ((port->transaction_id & 0xFF00) << 8)
1792                  | ((port->transaction_id & 0xFF0000) >> 8)
1793                  | ((port->transaction_id & 0xFF000000) >> 24));
1794         marker.pad = 0;
1795         marker.tlv_type_terminator = 0x00;
1796         marker.terminator_length = 0x00;
1797         for (index = 0; index < 90; index++)
1798                 marker.reserved_90[index] = 0;
1799
1800         // send the marker information
1801         if (ad_marker_send(port, &marker) >= 0) {
1802                 pr_debug("Sent Marker Information on port %d\n",
1803                          port->actor_port_number);
1804         }
1805 }
1806 #endif
1807
1808 /**
1809  * ad_marker_info_received - handle receive of a Marker information frame
1810  * @marker_info: Marker info received
1811  * @port: the port we're looking at
1812  *
1813  */
1814 static void ad_marker_info_received(struct bond_marker *marker_info,
1815         struct port *port)
1816 {
1817         struct bond_marker marker;
1818
1819         // copy the received marker data to the response marker
1820         //marker = *marker_info;
1821         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1822         // change the marker subtype to marker response
1823         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1824         // send the marker response
1825
1826         if (ad_marker_send(port, &marker) >= 0) {
1827                 pr_debug("Sent Marker Response on port %d\n",
1828                          port->actor_port_number);
1829         }
1830 }
1831
1832 /**
1833  * ad_marker_response_received - handle receive of a marker response frame
1834  * @marker: marker PDU received
1835  * @port: the port we're looking at
1836  *
1837  * This function does nothing since we decided not to implement send and handle
1838  * response for marker PDU's, in this stage, but only to respond to marker
1839  * information.
1840  */
1841 static void ad_marker_response_received(struct bond_marker *marker,
1842         struct port *port)
1843 {
1844         marker = NULL; /* just to satisfy the compiler */
1845         port = NULL;  /* just to satisfy the compiler */
1846         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1847 }
1848
1849 //////////////////////////////////////////////////////////////////////////////////////
1850 // ================= AD exported functions to the main bonding code ==================
1851 //////////////////////////////////////////////////////////////////////////////////////
1852
1853 // Check aggregators status in team every T seconds
1854 #define AD_AGGREGATOR_SELECTION_TIMER  8
1855
1856 /*
1857  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1858  *
1859  * Set the aggregation selection timer, to initiate an agg selection in
1860  * the very near future.  Called during first initialization, and during
1861  * any down to up transitions of the bond.
1862  */
1863 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1864 {
1865         BOND_AD_INFO(bond).agg_select_timer = timeout;
1866         BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
1867 }
1868
1869 static u16 aggregator_identifier;
1870
1871 /**
1872  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1873  * @bond: bonding struct to work on
1874  * @tick_resolution: tick duration (millisecond resolution)
1875  * @lacp_fast: boolean. whether fast periodic should be used
1876  *
1877  * Can be called only after the mac address of the bond is set.
1878  */
1879 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1880 {
1881         // check that the bond is not initialized yet
1882         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1883                                 bond->dev->dev_addr)) {
1884
1885                 aggregator_identifier = 0;
1886
1887                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1888                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1889                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1890
1891                 // initialize how many times this module is called in one second(should be about every 100ms)
1892                 ad_ticks_per_sec = tick_resolution;
1893
1894                 bond_3ad_initiate_agg_selection(bond,
1895                                                 AD_AGGREGATOR_SELECTION_TIMER *
1896                                                 ad_ticks_per_sec);
1897         }
1898 }
1899
1900 /**
1901  * bond_3ad_bind_slave - initialize a slave's port
1902  * @slave: slave struct to work on
1903  *
1904  * Returns:   0 on success
1905  *          < 0 on error
1906  */
1907 int bond_3ad_bind_slave(struct slave *slave)
1908 {
1909         struct bonding *bond = bond_get_bond_by_slave(slave);
1910         struct port *port;
1911         struct aggregator *aggregator;
1912
1913         if (bond == NULL) {
1914                 pr_err("%s: The slave %s is not attached to its bond\n",
1915                        slave->dev->master->name, slave->dev->name);
1916                 return -1;
1917         }
1918
1919         //check that the slave has not been intialized yet.
1920         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1921
1922                 // port initialization
1923                 port = &(SLAVE_AD_INFO(slave).port);
1924
1925                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1926
1927                 port->slave = slave;
1928                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1929                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1930                 //              ------------------------------------------------------------
1931                 // Port key :   | User key                       |      Speed       |Duplex|
1932                 //              ------------------------------------------------------------
1933                 //              16                               6               1 0
1934                 port->actor_admin_port_key = 0; // initialize this parameter
1935                 port->actor_admin_port_key |= __get_duplex(port);
1936                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1937                 port->actor_oper_port_key = port->actor_admin_port_key;
1938                 // if the port is not full duplex, then the port should be not lacp Enabled
1939                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1940                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1941                 // actor system is the bond's system
1942                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1943                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1944                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1945                 port->aggregator = NULL;
1946                 port->next_port_in_aggregator = NULL;
1947
1948                 __disable_port(port);
1949                 __initialize_port_locks(port);
1950
1951
1952                 // aggregator initialization
1953                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1954
1955                 ad_initialize_agg(aggregator);
1956
1957                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1958                 aggregator->aggregator_identifier = (++aggregator_identifier);
1959                 aggregator->slave = slave;
1960                 aggregator->is_active = 0;
1961                 aggregator->num_of_ports = 0;
1962         }
1963
1964         return 0;
1965 }
1966
1967 /**
1968  * bond_3ad_unbind_slave - deinitialize a slave's port
1969  * @slave: slave struct to work on
1970  *
1971  * Search for the aggregator that is related to this port, remove the
1972  * aggregator and assign another aggregator for other port related to it
1973  * (if any), and remove the port.
1974  */
1975 void bond_3ad_unbind_slave(struct slave *slave)
1976 {
1977         struct port *port, *prev_port, *temp_port;
1978         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1979         int select_new_active_agg = 0;
1980
1981         // find the aggregator related to this slave
1982         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1983
1984         // find the port related to this slave
1985         port = &(SLAVE_AD_INFO(slave).port);
1986
1987         // if slave is null, the whole port is not initialized
1988         if (!port->slave) {
1989                 pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1990                            slave->dev->master->name, slave->dev->name);
1991                 return;
1992         }
1993
1994         pr_debug("Unbinding Link Aggregation Group %d\n",
1995                  aggregator->aggregator_identifier);
1996
1997         /* Tell the partner that this port is not suitable for aggregation */
1998         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1999         __update_lacpdu_from_port(port);
2000         ad_lacpdu_send(port);
2001
2002         // check if this aggregator is occupied
2003         if (aggregator->lag_ports) {
2004                 // check if there are other ports related to this aggregator except
2005                 // the port related to this slave(thats ensure us that there is a
2006                 // reason to search for new aggregator, and that we will find one
2007                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
2008                         // find new aggregator for the related port(s)
2009                         new_aggregator = __get_first_agg(port);
2010                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
2011                                 // if the new aggregator is empty, or it is connected to our port only
2012                                 if (!new_aggregator->lag_ports
2013                                     || ((new_aggregator->lag_ports == port)
2014                                         && !new_aggregator->lag_ports->next_port_in_aggregator))
2015                                         break;
2016                         }
2017                         // if new aggregator found, copy the aggregator's parameters
2018                         // and connect the related lag_ports to the new aggregator
2019                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2020                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
2021                                          aggregator->aggregator_identifier,
2022                                          new_aggregator->aggregator_identifier);
2023
2024                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
2025                                         pr_info("%s: Removing an active aggregator\n",
2026                                                 aggregator->slave->dev->master->name);
2027                                         // select new active aggregator
2028                                          select_new_active_agg = 1;
2029                                 }
2030
2031                                 new_aggregator->is_individual = aggregator->is_individual;
2032                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2033                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2034                                 new_aggregator->partner_system = aggregator->partner_system;
2035                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2036                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2037                                 new_aggregator->receive_state = aggregator->receive_state;
2038                                 new_aggregator->transmit_state = aggregator->transmit_state;
2039                                 new_aggregator->lag_ports = aggregator->lag_ports;
2040                                 new_aggregator->is_active = aggregator->is_active;
2041                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2042
2043                                 // update the information that is written on the ports about the aggregator
2044                                 for (temp_port = aggregator->lag_ports; temp_port;
2045                                      temp_port = temp_port->next_port_in_aggregator) {
2046                                         temp_port->aggregator = new_aggregator;
2047                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2048                                 }
2049
2050                                 // clear the aggregator
2051                                 ad_clear_agg(aggregator);
2052
2053                                 if (select_new_active_agg)
2054                                         ad_agg_selection_logic(__get_first_agg(port));
2055                         } else {
2056                                 pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
2057                                            slave->dev->master->name);
2058                         }
2059                 } else { // in case that the only port related to this aggregator is the one we want to remove
2060                         select_new_active_agg = aggregator->is_active;
2061                         // clear the aggregator
2062                         ad_clear_agg(aggregator);
2063                         if (select_new_active_agg) {
2064                                 pr_info("%s: Removing an active aggregator\n",
2065                                         slave->dev->master->name);
2066                                 // select new active aggregator
2067                                 ad_agg_selection_logic(__get_first_agg(port));
2068                         }
2069                 }
2070         }
2071
2072         pr_debug("Unbinding port %d\n", port->actor_port_number);
2073         // find the aggregator that this port is connected to
2074         temp_aggregator = __get_first_agg(port);
2075         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2076                 prev_port = NULL;
2077                 // search the port in the aggregator's related ports
2078                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2079                      prev_port = temp_port,
2080                              temp_port = temp_port->next_port_in_aggregator) {
2081                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2082                                 if (prev_port)
2083                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2084                                 else
2085                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2086                                 temp_aggregator->num_of_ports--;
2087                                 if (temp_aggregator->num_of_ports == 0) {
2088                                         select_new_active_agg = temp_aggregator->is_active;
2089                                         // clear the aggregator
2090                                         ad_clear_agg(temp_aggregator);
2091                                         if (select_new_active_agg) {
2092                                                 pr_info("%s: Removing an active aggregator\n",
2093                                                         slave->dev->master->name);
2094                                                 // select new active aggregator
2095                                                 ad_agg_selection_logic(__get_first_agg(port));
2096                                         }
2097                                 }
2098                                 break;
2099                         }
2100                 }
2101         }
2102         port->slave = NULL;
2103 }
2104
2105 /**
2106  * bond_3ad_state_machine_handler - handle state machines timeout
2107  * @bond: bonding struct to work on
2108  *
2109  * The state machine handling concept in this module is to check every tick
2110  * which state machine should operate any function. The execution order is
2111  * round robin, so when we have an interaction between state machines, the
2112  * reply of one to each other might be delayed until next tick.
2113  *
2114  * This function also complete the initialization when the agg_select_timer
2115  * times out, and it selects an aggregator for the ports that are yet not
2116  * related to any aggregator, and selects the active aggregator for a bond.
2117  */
2118 void bond_3ad_state_machine_handler(struct work_struct *work)
2119 {
2120         struct bonding *bond = container_of(work, struct bonding,
2121                                             ad_work.work);
2122         struct port *port;
2123         struct aggregator *aggregator;
2124
2125         read_lock(&bond->lock);
2126
2127         if (bond->kill_timers)
2128                 goto out;
2129
2130         //check if there are any slaves
2131         if (bond->slave_cnt == 0)
2132                 goto re_arm;
2133
2134         // check if agg_select_timer timer after initialize is timed out
2135         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2136                 // select the active aggregator for the bond
2137                 if ((port = __get_first_port(bond))) {
2138                         if (!port->slave) {
2139                                 pr_warning("%s: Warning: bond's first port is uninitialized\n",
2140                                            bond->dev->name);
2141                                 goto re_arm;
2142                         }
2143
2144                         aggregator = __get_first_agg(port);
2145                         ad_agg_selection_logic(aggregator);
2146                 }
2147                 bond_3ad_set_carrier(bond);
2148         }
2149
2150         // for each port run the state machines
2151         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2152                 if (!port->slave) {
2153                         pr_warning("%s: Warning: Found an uninitialized port\n",
2154                                    bond->dev->name);
2155                         goto re_arm;
2156                 }
2157
2158                 ad_rx_machine(NULL, port);
2159                 ad_periodic_machine(port);
2160                 ad_port_selection_logic(port);
2161                 ad_mux_machine(port);
2162                 ad_tx_machine(port);
2163
2164                 // turn off the BEGIN bit, since we already handled it
2165                 if (port->sm_vars & AD_PORT_BEGIN)
2166                         port->sm_vars &= ~AD_PORT_BEGIN;
2167         }
2168
2169 re_arm:
2170         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2171 out:
2172         read_unlock(&bond->lock);
2173 }
2174
2175 /**
2176  * bond_3ad_rx_indication - handle a received frame
2177  * @lacpdu: received lacpdu
2178  * @slave: slave struct to work on
2179  * @length: length of the data received
2180  *
2181  * It is assumed that frames that were sent on this NIC don't returned as new
2182  * received frames (loopback). Since only the payload is given to this
2183  * function, it check for loopback.
2184  */
2185 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2186 {
2187         struct port *port;
2188
2189         if (length >= sizeof(struct lacpdu)) {
2190
2191                 port = &(SLAVE_AD_INFO(slave).port);
2192
2193                 if (!port->slave) {
2194                         pr_warning("%s: Warning: port of slave %s is uninitialized\n",
2195                                    slave->dev->name, slave->dev->master->name);
2196                         return;
2197                 }
2198
2199                 switch (lacpdu->subtype) {
2200                 case AD_TYPE_LACPDU:
2201                         pr_debug("Received LACPDU on port %d\n",
2202                                  port->actor_port_number);
2203                         ad_rx_machine(lacpdu, port);
2204                         break;
2205
2206                 case AD_TYPE_MARKER:
2207                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2208
2209                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2210                         case AD_MARKER_INFORMATION_SUBTYPE:
2211                                 pr_debug("Received Marker Information on port %d\n",
2212                                          port->actor_port_number);
2213                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2214                                 break;
2215
2216                         case AD_MARKER_RESPONSE_SUBTYPE:
2217                                 pr_debug("Received Marker Response on port %d\n",
2218                                          port->actor_port_number);
2219                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2220                                 break;
2221
2222                         default:
2223                                 pr_debug("Received an unknown Marker subtype on slot %d\n",
2224                                          port->actor_port_number);
2225                         }
2226                 }
2227         }
2228 }
2229
2230 /**
2231  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2232  * @slave: slave struct to work on
2233  *
2234  * Handle reselection of aggregator (if needed) for this port.
2235  */
2236 void bond_3ad_adapter_speed_changed(struct slave *slave)
2237 {
2238         struct port *port;
2239
2240         port = &(SLAVE_AD_INFO(slave).port);
2241
2242         // if slave is null, the whole port is not initialized
2243         if (!port->slave) {
2244                 pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
2245                            slave->dev->master->name, slave->dev->name);
2246                 return;
2247         }
2248
2249         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2250         port->actor_oper_port_key = port->actor_admin_port_key |=
2251                 (__get_link_speed(port) << 1);
2252         pr_debug("Port %d changed speed\n", port->actor_port_number);
2253         // there is no need to reselect a new aggregator, just signal the
2254         // state machines to reinitialize
2255         port->sm_vars |= AD_PORT_BEGIN;
2256 }
2257
2258 /**
2259  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2260  * @slave: slave struct to work on
2261  *
2262  * Handle reselection of aggregator (if needed) for this port.
2263  */
2264 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2265 {
2266         struct port *port;
2267
2268         port = &(SLAVE_AD_INFO(slave).port);
2269
2270         // if slave is null, the whole port is not initialized
2271         if (!port->slave) {
2272                 pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
2273                            slave->dev->master->name, slave->dev->name);
2274                 return;
2275         }
2276
2277         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2278         port->actor_oper_port_key = port->actor_admin_port_key |=
2279                 __get_duplex(port);
2280         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2281         // there is no need to reselect a new aggregator, just signal the
2282         // state machines to reinitialize
2283         port->sm_vars |= AD_PORT_BEGIN;
2284 }
2285
2286 /**
2287  * bond_3ad_handle_link_change - handle a slave's link status change indication
2288  * @slave: slave struct to work on
2289  * @status: whether the link is now up or down
2290  *
2291  * Handle reselection of aggregator (if needed) for this port.
2292  */
2293 void bond_3ad_handle_link_change(struct slave *slave, char link)
2294 {
2295         struct port *port;
2296
2297         port = &(SLAVE_AD_INFO(slave).port);
2298
2299         // if slave is null, the whole port is not initialized
2300         if (!port->slave) {
2301                 pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
2302                            slave->dev->master->name, slave->dev->name);
2303                 return;
2304         }
2305
2306         // 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)
2307         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2308         if (link == BOND_LINK_UP) {
2309                 port->is_enabled = true;
2310                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2311                 port->actor_oper_port_key = port->actor_admin_port_key |=
2312                         __get_duplex(port);
2313                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2314                 port->actor_oper_port_key = port->actor_admin_port_key |=
2315                         (__get_link_speed(port) << 1);
2316         } else {
2317                 /* link has failed */
2318                 port->is_enabled = false;
2319                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2320                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2321                                              ~AD_SPEED_KEY_BITS);
2322         }
2323         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2324         // there is no need to reselect a new aggregator, just signal the
2325         // state machines to reinitialize
2326         port->sm_vars |= AD_PORT_BEGIN;
2327 }
2328
2329 /*
2330  * set link state for bonding master: if we have an active
2331  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2332  * have an active aggregator if there are no slaves with link up.
2333  *
2334  * This behavior complies with IEEE 802.3 section 43.3.9.
2335  *
2336  * Called by bond_set_carrier(). Return zero if carrier state does not
2337  * change, nonzero if it does.
2338  */
2339 int bond_3ad_set_carrier(struct bonding *bond)
2340 {
2341         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2342                 if (!netif_carrier_ok(bond->dev)) {
2343                         netif_carrier_on(bond->dev);
2344                         return 1;
2345                 }
2346                 return 0;
2347         }
2348
2349         if (netif_carrier_ok(bond->dev)) {
2350                 netif_carrier_off(bond->dev);
2351                 return 1;
2352         }
2353         return 0;
2354 }
2355
2356 /**
2357  * bond_3ad_get_active_agg_info - get information of the active aggregator
2358  * @bond: bonding struct to work on
2359  * @ad_info: ad_info struct to fill with the bond's info
2360  *
2361  * Returns:   0 on success
2362  *          < 0 on error
2363  */
2364 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2365 {
2366         struct aggregator *aggregator = NULL;
2367         struct port *port;
2368
2369         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2370                 if (port->aggregator && port->aggregator->is_active) {
2371                         aggregator = port->aggregator;
2372                         break;
2373                 }
2374         }
2375
2376         if (aggregator) {
2377                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2378                 ad_info->ports = aggregator->num_of_ports;
2379                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2380                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2381                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2382                 return 0;
2383         }
2384
2385         return -1;
2386 }
2387
2388 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2389 {
2390         struct slave *slave, *start_at;
2391         struct bonding *bond = netdev_priv(dev);
2392         int slave_agg_no;
2393         int slaves_in_agg;
2394         int agg_id;
2395         int i;
2396         struct ad_info ad_info;
2397         int res = 1;
2398
2399         /* make sure that the slaves list will
2400          * not change during tx
2401          */
2402         read_lock(&bond->lock);
2403
2404         if (!BOND_IS_OK(bond))
2405                 goto out;
2406
2407         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2408                 pr_debug("%s: Error: bond_3ad_get_active_agg_info failed\n",
2409                          dev->name);
2410                 goto out;
2411         }
2412
2413         slaves_in_agg = ad_info.ports;
2414         agg_id = ad_info.aggregator_id;
2415
2416         if (slaves_in_agg == 0) {
2417                 /*the aggregator is empty*/
2418                 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2419                 goto out;
2420         }
2421
2422         slave_agg_no = bond->xmit_hash_policy(skb, slaves_in_agg);
2423
2424         bond_for_each_slave(bond, slave, i) {
2425                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2426
2427                 if (agg && (agg->aggregator_identifier == agg_id)) {
2428                         slave_agg_no--;
2429                         if (slave_agg_no < 0)
2430                                 break;
2431                 }
2432         }
2433
2434         if (slave_agg_no >= 0) {
2435                 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2436                        dev->name, agg_id);
2437                 goto out;
2438         }
2439
2440         start_at = slave;
2441
2442         bond_for_each_slave_from(bond, slave, i, start_at) {
2443                 int slave_agg_id = 0;
2444                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2445
2446                 if (agg)
2447                         slave_agg_id = agg->aggregator_identifier;
2448
2449                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2450                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2451                         break;
2452                 }
2453         }
2454
2455 out:
2456         if (res) {
2457                 /* no suitable interface, frame not sent */
2458                 dev_kfree_skb(skb);
2459         }
2460         read_unlock(&bond->lock);
2461         return NETDEV_TX_OK;
2462 }
2463
2464 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2465 {
2466         struct bonding *bond = netdev_priv(dev);
2467         struct slave *slave = NULL;
2468         int ret = NET_RX_DROP;
2469
2470         if (!(dev->flags & IFF_MASTER))
2471                 goto out;
2472
2473         if (!pskb_may_pull(skb, sizeof(struct lacpdu)))
2474                 goto out;
2475
2476         read_lock(&bond->lock);
2477         slave = bond_get_slave_by_dev(netdev_priv(dev), orig_dev);
2478         if (!slave)
2479                 goto out_unlock;
2480
2481         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2482
2483         ret = NET_RX_SUCCESS;
2484
2485 out_unlock:
2486         read_unlock(&bond->lock);
2487 out:
2488         dev_kfree_skb(skb);
2489
2490         return ret;
2491 }