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_agg - get the first aggregator in the bond
 140  * @bond: the bond we're looking at
 141  *
 142  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 143  * found.
 144  */
 145 static inline struct aggregator *__get_first_agg(struct port *port)
 146 {
 147         struct bonding *bond = __get_bond_by_port(port);
 148         struct slave *first_slave;
 149
 150         // If there's no bond for this port, or bond has no slaves
 151         if (bond == NULL)
 152                 return NULL;
 153         first_slave = bond_first_slave(bond);
 154
 155         return first_slave ? &(SLAVE_AD_INFO(first_slave).aggregator) : NULL;
 156 }
 157
 158 /*
 159  * __agg_has_partner
 160  *
 161  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 162  * address for the partner).  Return 0 if not.
 163  */
 164 static inline int __agg_has_partner(struct aggregator *agg)
 165 {
 166         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 167 }
 168
 169 /**
 170  * __disable_port - disable the port's slave
 171  * @port: the port we're looking at
 172  *
 173  */
 174 static inline void __disable_port(struct port *port)
 175 {
 176         bond_set_slave_inactive_flags(port->slave);
 177 }
 178
 179 /**
 180  * __enable_port - enable the port's slave, if it's up
 181  * @port: the port we're looking at
 182  *
 183  */
 184 static inline void __enable_port(struct port *port)
 185 {
 186         struct slave *slave = port->slave;
 187
 188         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
 189                 bond_set_slave_active_flags(slave);
 190 }
 191
 192 /**
 193  * __port_is_enabled - check if the port's slave is in active state
 194  * @port: the port we're looking at
 195  *
 196  */
 197 static inline int __port_is_enabled(struct port *port)
 198 {
 199         return bond_is_active_slave(port->slave);
 200 }
 201
 202 /**
 203  * __get_agg_selection_mode - get the aggregator selection mode
 204  * @port: the port we're looking at
 205  *
 206  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 207  */
 208 static inline u32 __get_agg_selection_mode(struct port *port)
 209 {
 210         struct bonding *bond = __get_bond_by_port(port);
 211
 212         if (bond == NULL)
 213                 return BOND_AD_STABLE;
 214
 215         return bond->params.ad_select;
 216 }
 217
 218 /**
 219  * __check_agg_selection_timer - check if the selection timer has expired
 220  * @port: the port we're looking at
 221  *
 222  */
 223 static inline int __check_agg_selection_timer(struct port *port)
 224 {
 225         struct bonding *bond = __get_bond_by_port(port);
 226
 227         if (bond == NULL)
 228                 return 0;
 229
 230         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 231 }
 232
 233 /**
 234  * __get_state_machine_lock - lock the port's state machines
 235  * @port: the port we're looking at
 236  *
 237  */
 238 static inline void __get_state_machine_lock(struct port *port)
 239 {
 240         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 241 }
 242
 243 /**
 244  * __release_state_machine_lock - unlock the port's state machines
 245  * @port: the port we're looking at
 246  *
 247  */
 248 static inline void __release_state_machine_lock(struct port *port)
 249 {
 250         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 251 }
 252
 253 /**
 254  * __get_link_speed - get a port's speed
 255  * @port: the port we're looking at
 256  *
 257  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 258  *     0,
 259  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 260  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 261  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 262  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 263  */
 264 static u16 __get_link_speed(struct port *port)
 265 {
 266         struct slave *slave = port->slave;
 267         u16 speed;
 268
 269         /* this if covers only a special case: when the configuration starts with
 270          * link down, it sets the speed to 0.
 271          * This is done in spite of the fact that the e100 driver reports 0 to be
 272          * compatible with MVT in the future.*/
 273         if (slave->link != BOND_LINK_UP)
 274                 speed = 0;
 275         else {
 276                 switch (slave->speed) {
 277                 case SPEED_10:
 278                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 279                         break;
 280
 281                 case SPEED_100:
 282                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 283                         break;
 284
 285                 case SPEED_1000:
 286                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 287                         break;
 288
 289                 case SPEED_10000:
 290                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 291                         break;
 292
 293                 default:
 294                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 295                         break;
 296                 }
 297         }
 298
 299         pr_debug("Port %d Received link speed %d update from adapter\n",
 300                  port->actor_port_number, speed);
 301         return speed;
 302 }
 303
 304 /**
 305  * __get_duplex - get a port's duplex
 306  * @port: the port we're looking at
 307  *
 308  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 309  *     0x01 if in full duplex
 310  *     0x00 otherwise
 311  */
 312 static u8 __get_duplex(struct port *port)
 313 {
 314         struct slave *slave = port->slave;
 315
 316         u8 retval;
 317
 318         //  handling a special case: when the configuration starts with
 319         // link down, it sets the duplex to 0.
 320         if (slave->link != BOND_LINK_UP)
 321                 retval = 0x0;
 322         else {
 323                 switch (slave->duplex) {
 324                 case DUPLEX_FULL:
 325                         retval = 0x1;
 326                         pr_debug("Port %d Received status full duplex update from adapter\n",
 327                                  port->actor_port_number);
 328                         break;
 329                 case DUPLEX_HALF:
 330                 default:
 331                         retval = 0x0;
 332                         pr_debug("Port %d Received status NOT full duplex update from adapter\n",
 333                                  port->actor_port_number);
 334                         break;
 335                 }
 336         }
 337         return retval;
 338 }
 339
 340 /**
 341  * __initialize_port_locks - initialize a port's STATE machine spinlock
 342  * @port: the slave of the port we're looking at
 343  *
 344  */
 345 static inline void __initialize_port_locks(struct slave *slave)
 346 {
 347         // make sure it isn't called twice
 348         spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
 349 }
 350
 351 //conversions
 352
 353 /**
 354  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 355  * @timer_type: which timer to operate
 356  * @par: timer parameter. see below
 357  *
 358  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 359  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 360  *                                                  %SLOW_PERIODIC_TIME.
 361  */
 362 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 363 {
 364         u16 retval = 0; /* to silence the compiler */
 365
 366         switch (timer_type) {
 367         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 368                 if (par)
 369                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 370                 else
 371                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 372                 break;
 373         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 374                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 375                 break;
 376         case AD_PERIODIC_TIMER:     // for periodic machine
 377                 retval = (par*ad_ticks_per_sec); // long timeout
 378                 break;
 379         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 380                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 381                 break;
 382         case AD_WAIT_WHILE_TIMER:           // for selection machine
 383                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 384                 break;
 385         }
 386         return retval;
 387 }
 388
 389
 390 /////////////////////////////////////////////////////////////////////////////////
 391 // ================= ad_rx_machine helper functions ==================
 392 /////////////////////////////////////////////////////////////////////////////////
 393
 394 /**
 395  * __choose_matched - update a port's matched variable from a received lacpdu
 396  * @lacpdu: the lacpdu we've received
 397  * @port: the port we're looking at
 398  *
 399  * Update the value of the matched variable, using parameter values from a
 400  * newly received lacpdu. Parameter values for the partner carried in the
 401  * received PDU are compared with the corresponding operational parameter
 402  * values for the actor. Matched is set to TRUE if all of these parameters
 403  * match and the PDU parameter partner_state.aggregation has the same value as
 404  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 405  * in the aggregation. Matched is also set to TRUE if the value of
 406  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 407  * an individual link and lacp will actively maintain the link. Otherwise,
 408  * matched is set to FALSE. LACP is considered to be actively maintaining the
 409  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 410  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 411  * partner_state.lacp_activity variables are TRUE.
 412  *
 413  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 414  * used here to implement the language from 802.3ad 43.4.9 that requires
 415  * recordPDU to "match" the LACPDU parameters to the stored values.
 416  */
 417 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 418 {
 419         // check if all parameters are alike
 420         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 421              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 422              !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 423              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 424              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 425              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 426             // or this is individual link(aggregation == FALSE)
 427             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 428                 ) {
 429                 // update the state machine Matched variable
 430                 port->sm_vars |= AD_PORT_MATCHED;
 431         } else {
 432                 port->sm_vars &= ~AD_PORT_MATCHED;
 433         }
 434 }
 435
 436 /**
 437  * __record_pdu - record parameters from a received lacpdu
 438  * @lacpdu: the lacpdu we've received
 439  * @port: the port we're looking at
 440  *
 441  * Record the parameter values for the Actor carried in a received lacpdu as
 442  * the current partner operational parameter values and sets
 443  * actor_oper_port_state.defaulted to FALSE.
 444  */
 445 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 446 {
 447         if (lacpdu && port) {
 448                 struct port_params *partner = &port->partner_oper;
 449
 450                 __choose_matched(lacpdu, port);
 451                 // record the new parameter values for the partner operational
 452                 partner->port_number = ntohs(lacpdu->actor_port);
 453                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 454                 partner->system = lacpdu->actor_system;
 455                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 456                 partner->key = ntohs(lacpdu->actor_key);
 457                 partner->port_state = lacpdu->actor_state;
 458
 459                 // set actor_oper_port_state.defaulted to FALSE
 460                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 461
 462                 // set the partner sync. to on if the partner is sync. and the port is matched
 463                 if ((port->sm_vars & AD_PORT_MATCHED)
 464                     && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
 465                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 466                 else
 467                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 468         }
 469 }
 470
 471 /**
 472  * __record_default - record default parameters
 473  * @port: the port we're looking at
 474  *
 475  * This function records the default parameter values for the partner carried
 476  * in the Partner Admin parameters as the current partner operational parameter
 477  * values and sets actor_oper_port_state.defaulted to TRUE.
 478  */
 479 static void __record_default(struct port *port)
 480 {
 481         if (port) {
 482                 // record the partner admin parameters
 483                 memcpy(&port->partner_oper, &port->partner_admin,
 484                        sizeof(struct port_params));
 485
 486                 // set actor_oper_port_state.defaulted to true
 487                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 488         }
 489 }
 490
 491 /**
 492  * __update_selected - update a port's Selected variable from a received lacpdu
 493  * @lacpdu: the lacpdu we've received
 494  * @port: the port we're looking at
 495  *
 496  * Update the value of the selected variable, using parameter values from a
 497  * newly received lacpdu. The parameter values for the Actor carried in the
 498  * received PDU are compared with the corresponding operational parameter
 499  * values for the ports partner. If one or more of the comparisons shows that
 500  * the value(s) received in the PDU differ from the current operational values,
 501  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 502  * set to out_of_sync. Otherwise, selected remains unchanged.
 503  */
 504 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 505 {
 506         if (lacpdu && port) {
 507                 const struct port_params *partner = &port->partner_oper;
 508
 509                 // check if any parameter is different
 510                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 511                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 512                     MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system) ||
 513                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 514                     ntohs(lacpdu->actor_key) != partner->key ||
 515                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 516                         // update the state machine Selected variable
 517                         port->sm_vars &= ~AD_PORT_SELECTED;
 518                 }
 519         }
 520 }
 521
 522 /**
 523  * __update_default_selected - update a port's Selected variable from Partner
 524  * @port: the port we're looking at
 525  *
 526  * This function updates the value of the selected variable, using the partner
 527  * administrative parameter values. The administrative values are compared with
 528  * the corresponding operational parameter values for the partner. If one or
 529  * more of the comparisons shows that the administrative value(s) differ from
 530  * the current operational values, then Selected is set to FALSE and
 531  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 532  * Selected remains unchanged.
 533  */
 534 static void __update_default_selected(struct port *port)
 535 {
 536         if (port) {
 537                 const struct port_params *admin = &port->partner_admin;
 538                 const struct port_params *oper = &port->partner_oper;
 539
 540                 // check if any parameter is different
 541                 if (admin->port_number != oper->port_number ||
 542                     admin->port_priority != oper->port_priority ||
 543                     MAC_ADDRESS_COMPARE(&admin->system, &oper->system) ||
 544                     admin->system_priority != oper->system_priority ||
 545                     admin->key != oper->key ||
 546                     (admin->port_state & AD_STATE_AGGREGATION)
 547                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 548                         // update the state machine Selected variable
 549                         port->sm_vars &= ~AD_PORT_SELECTED;
 550                 }
 551         }
 552 }
 553
 554 /**
 555  * __update_ntt - update a port's ntt variable from a received lacpdu
 556  * @lacpdu: the lacpdu we've received
 557  * @port: the port we're looking at
 558  *
 559  * Updates the value of the ntt variable, using parameter values from a newly
 560  * received lacpdu. The parameter values for the partner carried in the
 561  * received PDU are compared with the corresponding operational parameter
 562  * values for the Actor. If one or more of the comparisons shows that the
 563  * value(s) received in the PDU differ from the current operational values,
 564  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 565  */
 566 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 567 {
 568         // validate lacpdu and port
 569         if (lacpdu && port) {
 570                 // check if any parameter is different
 571                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 572                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 573                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 574                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 575                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 576                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 577                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 578                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 579                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 580                    ) {
 581
 582                         port->ntt = true;
 583                 }
 584         }
 585 }
 586
 587 /**
 588  * __attach_bond_to_agg
 589  * @port: the port we're looking at
 590  *
 591  * Handle the attaching of the port's control parser/multiplexer and the
 592  * aggregator. This function does nothing since the parser/multiplexer of the
 593  * receive and the parser/multiplexer of the aggregator are already combined.
 594  */
 595 static void __attach_bond_to_agg(struct port *port)
 596 {
 597         port = NULL; /* just to satisfy the compiler */
 598         // This function does nothing since the parser/multiplexer of the receive
 599         // and the parser/multiplexer of the aggregator are already combined
 600 }
 601
 602 /**
 603  * __detach_bond_from_agg
 604  * @port: the port we're looking at
 605  *
 606  * Handle the detaching of the port's control parser/multiplexer from the
 607  * aggregator. This function does nothing since the parser/multiplexer of the
 608  * receive and the parser/multiplexer of the aggregator are already combined.
 609  */
 610 static void __detach_bond_from_agg(struct port *port)
 611 {
 612         port = NULL; /* just to satisfy the compiler */
 613         // This function does nothing since the parser/multiplexer of the receive
 614         // and the parser/multiplexer of the aggregator are already combined
 615 }
 616
 617 /**
 618  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 619  * @aggregator: the aggregator we're looking at
 620  *
 621  */
 622 static int __agg_ports_are_ready(struct aggregator *aggregator)
 623 {
 624         struct port *port;
 625         int retval = 1;
 626
 627         if (aggregator) {
 628                 // scan all ports in this aggregator to verfy if they are all ready
 629                 for (port = aggregator->lag_ports;
 630                      port;
 631                      port = port->next_port_in_aggregator) {
 632                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 633                                 retval = 0;
 634                                 break;
 635                         }
 636                 }
 637         }
 638
 639         return retval;
 640 }
 641
 642 /**
 643  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 644  * @aggregator: the aggregator we're looking at
 645  * @val: Should the ports' ready bit be set on or off
 646  *
 647  */
 648 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 649 {
 650         struct port *port;
 651
 652         for (port = aggregator->lag_ports; port;
 653              port = port->next_port_in_aggregator) {
 654                 if (val)
 655                         port->sm_vars |= AD_PORT_READY;
 656                 else
 657                         port->sm_vars &= ~AD_PORT_READY;
 658         }
 659 }
 660
 661 /**
 662  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 663  * @aggregator: the aggregator we're looking at
 664  *
 665  */
 666 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 667 {
 668         u32 bandwidth = 0;
 669
 670         if (aggregator->num_of_ports) {
 671                 switch (__get_link_speed(aggregator->lag_ports)) {
 672                 case AD_LINK_SPEED_BITMASK_1MBPS:
 673                         bandwidth = aggregator->num_of_ports;
 674                         break;
 675                 case AD_LINK_SPEED_BITMASK_10MBPS:
 676                         bandwidth = aggregator->num_of_ports * 10;
 677                         break;
 678                 case AD_LINK_SPEED_BITMASK_100MBPS:
 679                         bandwidth = aggregator->num_of_ports * 100;
 680                         break;
 681                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 682                         bandwidth = aggregator->num_of_ports * 1000;
 683                         break;
 684                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 685                         bandwidth = aggregator->num_of_ports * 10000;
 686                         break;
 687                 default:
 688                         bandwidth = 0; /*to silence the compiler ....*/
 689                 }
 690         }
 691         return bandwidth;
 692 }
 693
 694 /**
 695  * __get_active_agg - get the current active aggregator
 696  * @aggregator: the aggregator we're looking at
 697  *
 698  */
 699 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 700 {
 701         struct bonding *bond = aggregator->slave->bond;
 702         struct list_head *iter;
 703         struct slave *slave;
 704
 705         bond_for_each_slave(bond, slave, iter)
 706                 if (SLAVE_AD_INFO(slave).aggregator.is_active)
 707                         return &(SLAVE_AD_INFO(slave).aggregator);
 708
 709         return NULL;
 710 }
 711
 712 /**
 713  * __update_lacpdu_from_port - update a port's lacpdu fields
 714  * @port: the port we're looking at
 715  *
 716  */
 717 static inline void __update_lacpdu_from_port(struct port *port)
 718 {
 719         struct lacpdu *lacpdu = &port->lacpdu;
 720         const struct port_params *partner = &port->partner_oper;
 721
 722         /* update current actual Actor parameters */
 723         /* lacpdu->subtype                   initialized
 724          * lacpdu->version_number            initialized
 725          * lacpdu->tlv_type_actor_info       initialized
 726          * lacpdu->actor_information_length  initialized
 727          */
 728
 729         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 730         lacpdu->actor_system = port->actor_system;
 731         lacpdu->actor_key = htons(port->actor_oper_port_key);
 732         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 733         lacpdu->actor_port = htons(port->actor_port_number);
 734         lacpdu->actor_state = port->actor_oper_port_state;
 735
 736         /* lacpdu->reserved_3_1              initialized
 737          * lacpdu->tlv_type_partner_info     initialized
 738          * lacpdu->partner_information_length initialized
 739          */
 740
 741         lacpdu->partner_system_priority = htons(partner->system_priority);
 742         lacpdu->partner_system = partner->system;
 743         lacpdu->partner_key = htons(partner->key);
 744         lacpdu->partner_port_priority = htons(partner->port_priority);
 745         lacpdu->partner_port = htons(partner->port_number);
 746         lacpdu->partner_state = partner->port_state;
 747
 748         /* lacpdu->reserved_3_2              initialized
 749          * lacpdu->tlv_type_collector_info   initialized
 750          * lacpdu->collector_information_length initialized
 751          * collector_max_delay                initialized
 752          * reserved_12[12]                   initialized
 753          * tlv_type_terminator               initialized
 754          * terminator_length                 initialized
 755          * reserved_50[50]                   initialized
 756          */
 757 }
 758
 759 //////////////////////////////////////////////////////////////////////////////////////
 760 // ================= main 802.3ad protocol code ======================================
 761 //////////////////////////////////////////////////////////////////////////////////////
 762
 763 /**
 764  * ad_lacpdu_send - send out a lacpdu packet on a given port
 765  * @port: the port we're looking at
 766  *
 767  * Returns:   0 on success
 768  *          < 0 on error
 769  */
 770 static int ad_lacpdu_send(struct port *port)
 771 {
 772         struct slave *slave = port->slave;
 773         struct sk_buff *skb;
 774         struct lacpdu_header *lacpdu_header;
 775         int length = sizeof(struct lacpdu_header);
 776
 777         skb = dev_alloc_skb(length);
 778         if (!skb)
 779                 return -ENOMEM;
 780
 781         skb->dev = slave->dev;
 782         skb_reset_mac_header(skb);
 783         skb->network_header = skb->mac_header + ETH_HLEN;
 784         skb->protocol = PKT_TYPE_LACPDU;
 785         skb->priority = TC_PRIO_CONTROL;
 786
 787         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 788
 789         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 790         /* Note: source address is set to be the member's PERMANENT address,
 791            because we use it to identify loopback lacpdus in receive. */
 792         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 793         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 794
 795         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 796
 797         dev_queue_xmit(skb);
 798
 799         return 0;
 800 }
 801
 802 /**
 803  * ad_marker_send - send marker information/response on a given port
 804  * @port: the port we're looking at
 805  * @marker: marker data to send
 806  *
 807  * Returns:   0 on success
 808  *          < 0 on error
 809  */
 810 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 811 {
 812         struct slave *slave = port->slave;
 813         struct sk_buff *skb;
 814         struct bond_marker_header *marker_header;
 815         int length = sizeof(struct bond_marker_header);
 816
 817         skb = dev_alloc_skb(length + 16);
 818         if (!skb)
 819                 return -ENOMEM;
 820
 821         skb_reserve(skb, 16);
 822
 823         skb->dev = slave->dev;
 824         skb_reset_mac_header(skb);
 825         skb->network_header = skb->mac_header + ETH_HLEN;
 826         skb->protocol = PKT_TYPE_LACPDU;
 827
 828         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 829
 830         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 831         /* Note: source address is set to be the member's PERMANENT address,
 832            because we use it to identify loopback MARKERs in receive. */
 833         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 834         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 835
 836         marker_header->marker = *marker; // struct copy
 837
 838         dev_queue_xmit(skb);
 839
 840         return 0;
 841 }
 842
 843 /**
 844  * ad_mux_machine - handle a port's mux state machine
 845  * @port: the port we're looking at
 846  *
 847  */
 848 static void ad_mux_machine(struct port *port)
 849 {
 850         mux_states_t last_state;
 851
 852         // keep current State Machine state to compare later if it was changed
 853         last_state = port->sm_mux_state;
 854
 855         if (port->sm_vars & AD_PORT_BEGIN) {
 856                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 857         } else {
 858                 switch (port->sm_mux_state) {
 859                 case AD_MUX_DETACHED:
 860                         if ((port->sm_vars & AD_PORT_SELECTED)
 861                             || (port->sm_vars & AD_PORT_STANDBY))
 862                                 /* if SELECTED or STANDBY */
 863                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 864                         break;
 865                 case AD_MUX_WAITING:
 866                         // if SELECTED == FALSE return to DETACH state
 867                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 868                                 port->sm_vars &= ~AD_PORT_READY_N;
 869                                 // in order to withhold the Selection Logic to check all ports READY_N value
 870                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 871                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 872                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 873                                 break;
 874                         }
 875
 876                         // check if the wait_while_timer expired
 877                         if (port->sm_mux_timer_counter
 878                             && !(--port->sm_mux_timer_counter))
 879                                 port->sm_vars |= AD_PORT_READY_N;
 880
 881                         // in order to withhold the selection logic to check all ports READY_N value
 882                         // every callback cycle to update ready variable, we check READY_N and update READY here
 883                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 884
 885                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 886                         if ((port->sm_vars & AD_PORT_READY)
 887                             && !port->sm_mux_timer_counter)
 888                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 889                         break;
 890                 case AD_MUX_ATTACHED:
 891                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 892                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 893                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 894                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 895                                 port->sm_vars &= ~AD_PORT_READY_N;
 896                                 // in order to withhold the selection logic to check all ports READY_N value
 897                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 898                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 899                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 900                         }
 901                         break;
 902                 case AD_MUX_COLLECTING_DISTRIBUTING:
 903                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 904                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 905                            ) {
 906                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 907
 908                         } else {
 909                                 // if port state hasn't changed make
 910                                 // sure that a collecting distributing
 911                                 // port in an active aggregator is enabled
 912                                 if (port->aggregator &&
 913                                     port->aggregator->is_active &&
 914                                     !__port_is_enabled(port)) {
 915
 916                                         __enable_port(port);
 917                                 }
 918                         }
 919                         break;
 920                 default:    //to silence the compiler
 921                         break;
 922                 }
 923         }
 924
 925         // check if the state machine was changed
 926         if (port->sm_mux_state != last_state) {
 927                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
 928                          port->actor_port_number, last_state,
 929                          port->sm_mux_state);
 930                 switch (port->sm_mux_state) {
 931                 case AD_MUX_DETACHED:
 932                         __detach_bond_from_agg(port);
 933                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 934                         ad_disable_collecting_distributing(port);
 935                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 936                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 937                         port->ntt = true;
 938                         break;
 939                 case AD_MUX_WAITING:
 940                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 941                         break;
 942                 case AD_MUX_ATTACHED:
 943                         __attach_bond_to_agg(port);
 944                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 945                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 946                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 947                         ad_disable_collecting_distributing(port);
 948                         port->ntt = true;
 949                         break;
 950                 case AD_MUX_COLLECTING_DISTRIBUTING:
 951                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 952                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 953                         ad_enable_collecting_distributing(port);
 954                         port->ntt = true;
 955                         break;
 956                 default:    //to silence the compiler
 957                         break;
 958                 }
 959         }
 960 }
 961
 962 /**
 963  * ad_rx_machine - handle a port's rx State Machine
 964  * @lacpdu: the lacpdu we've received
 965  * @port: the port we're looking at
 966  *
 967  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
 968  * CURRENT. If timer expired set the state machine in the proper state.
 969  * In other cases, this function checks if we need to switch to other state.
 970  */
 971 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
 972 {
 973         rx_states_t last_state;
 974
 975         // keep current State Machine state to compare later if it was changed
 976         last_state = port->sm_rx_state;
 977
 978         // check if state machine should change state
 979         // first, check if port was reinitialized
 980         if (port->sm_vars & AD_PORT_BEGIN)
 981                 /* next state */
 982                 port->sm_rx_state = AD_RX_INITIALIZE;
 983         // check if port is not enabled
 984         else if (!(port->sm_vars & AD_PORT_BEGIN)
 985                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
 986                 /* next state */
 987                 port->sm_rx_state = AD_RX_PORT_DISABLED;
 988         // check if new lacpdu arrived
 989         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
 990                 port->sm_rx_timer_counter = 0; // zero timer
 991                 port->sm_rx_state = AD_RX_CURRENT;
 992         } else {
 993                 // if timer is on, and if it is expired
 994                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
 995                         switch (port->sm_rx_state) {
 996                         case AD_RX_EXPIRED:
 997                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
 998                                 break;
 999                         case AD_RX_CURRENT:
1000                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1001                                 break;
1002                         default:    //to silence the compiler
1003                                 break;
1004                         }
1005                 } else {
1006                         // if no lacpdu arrived and no timer is on
1007                         switch (port->sm_rx_state) {
1008                         case AD_RX_PORT_DISABLED:
1009                                 if (port->sm_vars & AD_PORT_MOVED)
1010                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1011                                 else if (port->is_enabled
1012                                          && (port->sm_vars
1013                                              & AD_PORT_LACP_ENABLED))
1014                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1015                                 else if (port->is_enabled
1016                                          && ((port->sm_vars
1017                                               & AD_PORT_LACP_ENABLED) == 0))
1018                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1019                                 break;
1020                         default:    //to silence the compiler
1021                                 break;
1022
1023                         }
1024                 }
1025         }
1026
1027         // check if the State machine was changed or new lacpdu arrived
1028         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1029                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1030                          port->actor_port_number, last_state,
1031                          port->sm_rx_state);
1032                 switch (port->sm_rx_state) {
1033                 case AD_RX_INITIALIZE:
1034                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1035                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1036                         else
1037                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1038                         port->sm_vars &= ~AD_PORT_SELECTED;
1039                         __record_default(port);
1040                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1041                         port->sm_vars &= ~AD_PORT_MOVED;
1042                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1043
1044                         /*- Fall Through -*/
1045
1046                 case AD_RX_PORT_DISABLED:
1047                         port->sm_vars &= ~AD_PORT_MATCHED;
1048                         break;
1049                 case AD_RX_LACP_DISABLED:
1050                         port->sm_vars &= ~AD_PORT_SELECTED;
1051                         __record_default(port);
1052                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1053                         port->sm_vars |= AD_PORT_MATCHED;
1054                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1055                         break;
1056                 case AD_RX_EXPIRED:
1057                         //Reset of the Synchronization flag. (Standard 43.4.12)
1058                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1059                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1060                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1061                         port->sm_vars &= ~AD_PORT_MATCHED;
1062                         port->partner_oper.port_state |=
1063                                 AD_STATE_LACP_ACTIVITY;
1064                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1065                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1066                         break;
1067                 case AD_RX_DEFAULTED:
1068                         __update_default_selected(port);
1069                         __record_default(port);
1070                         port->sm_vars |= AD_PORT_MATCHED;
1071                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1072                         break;
1073                 case AD_RX_CURRENT:
1074                         // detect loopback situation
1075                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1076                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1077                                 pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
1078                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1079                                        port->slave->bond->dev->name, port->slave->dev->name);
1080                                 return;
1081                         }
1082                         __update_selected(lacpdu, port);
1083                         __update_ntt(lacpdu, port);
1084                         __record_pdu(lacpdu, port);
1085                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1086                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1087                         break;
1088                 default:    //to silence the compiler
1089                         break;
1090                 }
1091         }
1092 }
1093
1094 /**
1095  * ad_tx_machine - handle a port's tx state machine
1096  * @port: the port we're looking at
1097  *
1098  */
1099 static void ad_tx_machine(struct port *port)
1100 {
1101         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1102         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1103                 // check if there is something to send
1104                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1105                         __update_lacpdu_from_port(port);
1106
1107                         if (ad_lacpdu_send(port) >= 0) {
1108                                 pr_debug("Sent LACPDU on port %d\n",
1109                                          port->actor_port_number);
1110
1111                                 /* mark ntt as false, so it will not be sent again until
1112                                    demanded */
1113                                 port->ntt = false;
1114                         }
1115                 }
1116                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1117                 port->sm_tx_timer_counter =
1118                         ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1119         }
1120 }
1121
1122 /**
1123  * ad_periodic_machine - handle a port's periodic state machine
1124  * @port: the port we're looking at
1125  *
1126  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1127  */
1128 static void ad_periodic_machine(struct port *port)
1129 {
1130         periodic_states_t last_state;
1131
1132         // keep current state machine state to compare later if it was changed
1133         last_state = port->sm_periodic_state;
1134
1135         // check if port was reinitialized
1136         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1137             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1138            ) {
1139                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1140         }
1141         // check if state machine should change state
1142         else if (port->sm_periodic_timer_counter) {
1143                 // check if periodic state machine expired
1144                 if (!(--port->sm_periodic_timer_counter)) {
1145                         // if expired then do tx
1146                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1147                 } else {
1148                         // If not expired, check if there is some new timeout parameter from the partner state
1149                         switch (port->sm_periodic_state) {
1150                         case AD_FAST_PERIODIC:
1151                                 if (!(port->partner_oper.port_state
1152                                       & AD_STATE_LACP_TIMEOUT))
1153                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1154                                 break;
1155                         case AD_SLOW_PERIODIC:
1156                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1157                                         // stop current timer
1158                                         port->sm_periodic_timer_counter = 0;
1159                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1160                                 }
1161                                 break;
1162                         default:    //to silence the compiler
1163                                 break;
1164                         }
1165                 }
1166         } else {
1167                 switch (port->sm_periodic_state) {
1168                 case AD_NO_PERIODIC:
1169                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1170                         break;
1171                 case AD_PERIODIC_TX:
1172                         if (!(port->partner_oper.port_state
1173                               & AD_STATE_LACP_TIMEOUT))
1174                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1175                         else
1176                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1177                         break;
1178                 default:    //to silence the compiler
1179                         break;
1180                 }
1181         }
1182
1183         // check if the state machine was changed
1184         if (port->sm_periodic_state != last_state) {
1185                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1186                          port->actor_port_number, last_state,
1187                          port->sm_periodic_state);
1188                 switch (port->sm_periodic_state) {
1189                 case AD_NO_PERIODIC:
1190                         port->sm_periodic_timer_counter = 0;       // zero timer
1191                         break;
1192                 case AD_FAST_PERIODIC:
1193                         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
1194                         break;
1195                 case AD_SLOW_PERIODIC:
1196                         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
1197                         break;
1198                 case AD_PERIODIC_TX:
1199                         port->ntt = true;
1200                         break;
1201                 default:    //to silence the compiler
1202                         break;
1203                 }
1204         }
1205 }
1206
1207 /**
1208  * ad_port_selection_logic - select aggregation groups
1209  * @port: the port we're looking at
1210  *
1211  * Select aggregation groups, and assign each port for it's aggregetor. The
1212  * selection logic is called in the inititalization (after all the handshkes),
1213  * and after every lacpdu receive (if selected is off).
1214  */
1215 static void ad_port_selection_logic(struct port *port)
1216 {
1217         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1218         struct port *last_port = NULL, *curr_port;
1219         struct list_head *iter;
1220         struct bonding *bond;
1221         struct slave *slave;
1222         int found = 0;
1223
1224         // if the port is already Selected, do nothing
1225         if (port->sm_vars & AD_PORT_SELECTED)
1226                 return;
1227
1228         bond = __get_bond_by_port(port);
1229
1230         // if the port is connected to other aggregator, detach it
1231         if (port->aggregator) {
1232                 // detach the port from its former aggregator
1233                 temp_aggregator = port->aggregator;
1234                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1235                      last_port = curr_port,
1236                              curr_port = curr_port->next_port_in_aggregator) {
1237                         if (curr_port == port) {
1238                                 temp_aggregator->num_of_ports--;
1239                                 if (!last_port) {// if it is the first port attached to the aggregator
1240                                         temp_aggregator->lag_ports =
1241                                                 port->next_port_in_aggregator;
1242                                 } else {// not the first port attached to the aggregator
1243                                         last_port->next_port_in_aggregator =
1244                                                 port->next_port_in_aggregator;
1245                                 }
1246
1247                                 // clear the port's relations to this aggregator
1248                                 port->aggregator = NULL;
1249                                 port->next_port_in_aggregator = NULL;
1250                                 port->actor_port_aggregator_identifier = 0;
1251
1252                                 pr_debug("Port %d left LAG %d\n",
1253                                          port->actor_port_number,
1254                                          temp_aggregator->aggregator_identifier);
1255                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1256                                 if (!temp_aggregator->lag_ports)
1257                                         ad_clear_agg(temp_aggregator);
1258                                 break;
1259                         }
1260                 }
1261                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1262                         pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1263                                    port->slave->bond->dev->name,
1264                                    port->actor_port_number,
1265                                    port->slave->dev->name,
1266                                    port->aggregator->aggregator_identifier);
1267                 }
1268         }
1269         // search on all aggregators for a suitable aggregator for this port
1270         bond_for_each_slave(bond, slave, iter) {
1271                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1272
1273                 // keep a free aggregator for later use(if needed)
1274                 if (!aggregator->lag_ports) {
1275                         if (!free_aggregator)
1276                                 free_aggregator = aggregator;
1277                         continue;
1278                 }
1279                 // check if current aggregator suits us
1280                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1281                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1282                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1283                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1284                     ) &&
1285                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1286                       !aggregator->is_individual)  // but is not individual OR
1287                     )
1288                    ) {
1289                         // attach to the founded aggregator
1290                         port->aggregator = aggregator;
1291                         port->actor_port_aggregator_identifier =
1292                                 port->aggregator->aggregator_identifier;
1293                         port->next_port_in_aggregator = aggregator->lag_ports;
1294                         port->aggregator->num_of_ports++;
1295                         aggregator->lag_ports = port;
1296                         pr_debug("Port %d joined LAG %d(existing LAG)\n",
1297                                  port->actor_port_number,
1298                                  port->aggregator->aggregator_identifier);
1299
1300                         // mark this port as selected
1301                         port->sm_vars |= AD_PORT_SELECTED;
1302                         found = 1;
1303                         break;
1304                 }
1305         }
1306
1307         // the port couldn't find an aggregator - attach it to a new aggregator
1308         if (!found) {
1309                 if (free_aggregator) {
1310                         // assign port a new aggregator
1311                         port->aggregator = free_aggregator;
1312                         port->actor_port_aggregator_identifier =
1313                                 port->aggregator->aggregator_identifier;
1314
1315                         // update the new aggregator's parameters
1316                         // if port was responsed from the end-user
1317                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1318                                 /* if port is full duplex */
1319                                 port->aggregator->is_individual = false;
1320                         else
1321                                 port->aggregator->is_individual = true;
1322
1323                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1324                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1325                         port->aggregator->partner_system =
1326                                 port->partner_oper.system;
1327                         port->aggregator->partner_system_priority =
1328                                 port->partner_oper.system_priority;
1329                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1330                         port->aggregator->receive_state = 1;
1331                         port->aggregator->transmit_state = 1;
1332                         port->aggregator->lag_ports = port;
1333                         port->aggregator->num_of_ports++;
1334
1335                         // mark this port as selected
1336                         port->sm_vars |= AD_PORT_SELECTED;
1337
1338                         pr_debug("Port %d joined LAG %d(new LAG)\n",
1339                                  port->actor_port_number,
1340                                  port->aggregator->aggregator_identifier);
1341                 } else {
1342                         pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1343                                port->slave->bond->dev->name,
1344                                port->actor_port_number, port->slave->dev->name);
1345                 }
1346         }
1347         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1348         // else set ready=FALSE in all aggregator's ports
1349         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1350
1351         aggregator = __get_first_agg(port);
1352         ad_agg_selection_logic(aggregator);
1353 }
1354
1355 /*
1356  * Decide if "agg" is a better choice for the new active aggregator that
1357  * the current best, according to the ad_select policy.
1358  */
1359 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1360                                                 struct aggregator *curr)
1361 {
1362         /*
1363          * 0. If no best, select current.
1364          *
1365          * 1. If the current agg is not individual, and the best is
1366          *    individual, select current.
1367          *
1368          * 2. If current agg is individual and the best is not, keep best.
1369          *
1370          * 3. Therefore, current and best are both individual or both not
1371          *    individual, so:
1372          *
1373          * 3a. If current agg partner replied, and best agg partner did not,
1374          *     select current.
1375          *
1376          * 3b. If current agg partner did not reply and best agg partner
1377          *     did reply, keep best.
1378          *
1379          * 4.  Therefore, current and best both have partner replies or
1380          *     both do not, so perform selection policy:
1381          *
1382          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1383          *     select by bandwidth.
1384          *
1385          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1386          */
1387         if (!best)
1388                 return curr;
1389
1390         if (!curr->is_individual && best->is_individual)
1391                 return curr;
1392
1393         if (curr->is_individual && !best->is_individual)
1394                 return best;
1395
1396         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1397                 return curr;
1398
1399         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1400                 return best;
1401
1402         switch (__get_agg_selection_mode(curr->lag_ports)) {
1403         case BOND_AD_COUNT:
1404                 if (curr->num_of_ports > best->num_of_ports)
1405                         return curr;
1406
1407                 if (curr->num_of_ports < best->num_of_ports)
1408                         return best;
1409
1410                 /*FALLTHROUGH*/
1411         case BOND_AD_STABLE:
1412         case BOND_AD_BANDWIDTH:
1413                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1414                         return curr;
1415
1416                 break;
1417
1418         default:
1419                 pr_warning("%s: Impossible agg select mode %d\n",
1420                            curr->slave->bond->dev->name,
1421                            __get_agg_selection_mode(curr->lag_ports));
1422                 break;
1423         }
1424
1425         return best;
1426 }
1427
1428 static int agg_device_up(const struct aggregator *agg)
1429 {
1430         struct port *port = agg->lag_ports;
1431         if (!port)
1432                 return 0;
1433         return (netif_running(port->slave->dev) &&
1434                 netif_carrier_ok(port->slave->dev));
1435 }
1436
1437 /**
1438  * ad_agg_selection_logic - select an aggregation group for a team
1439  * @aggregator: the aggregator we're looking at
1440  *
1441  * It is assumed that only one aggregator may be selected for a team.
1442  *
1443  * The logic of this function is to select the aggregator according to
1444  * the ad_select policy:
1445  *
1446  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1447  * it, and to reselect the active aggregator only if the previous
1448  * aggregator has no more ports related to it.
1449  *
1450  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1451  * bandwidth, and reselect whenever a link state change takes place or the
1452  * set of slaves in the bond changes.
1453  *
1454  * BOND_AD_COUNT: select the aggregator with largest number of ports
1455  * (slaves), and reselect whenever a link state change takes place or the
1456  * set of slaves in the bond changes.
1457  *
1458  * FIXME: this function MUST be called with the first agg in the bond, or
1459  * __get_active_agg() won't work correctly. This function should be better
1460  * called with the bond itself, and retrieve the first agg from it.
1461  */
1462 static void ad_agg_selection_logic(struct aggregator *agg)
1463 {
1464         struct aggregator *best, *active, *origin;
1465         struct bonding *bond = agg->slave->bond;
1466         struct list_head *iter;
1467         struct slave *slave;
1468         struct port *port;
1469
1470         origin = agg;
1471         active = __get_active_agg(agg);
1472         best = (active && agg_device_up(active)) ? active : NULL;
1473
1474         bond_for_each_slave(bond, slave, iter) {
1475                 agg = &(SLAVE_AD_INFO(slave).aggregator);
1476
1477                 agg->is_active = 0;
1478
1479                 if (agg->num_of_ports && agg_device_up(agg))
1480                         best = ad_agg_selection_test(best, agg);
1481         }
1482
1483         if (best &&
1484             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1485                 /*
1486                  * For the STABLE policy, don't replace the old active
1487                  * aggregator if it's still active (it has an answering
1488                  * partner) or if both the best and active don't have an
1489                  * answering partner.
1490                  */
1491                 if (active && active->lag_ports &&
1492                     active->lag_ports->is_enabled &&
1493                     (__agg_has_partner(active) ||
1494                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1495                         if (!(!active->actor_oper_aggregator_key &&
1496                               best->actor_oper_aggregator_key)) {
1497                                 best = NULL;
1498                                 active->is_active = 1;
1499                         }
1500                 }
1501         }
1502
1503         if (best && (best == active)) {
1504                 best = NULL;
1505                 active->is_active = 1;
1506         }
1507
1508         // if there is new best aggregator, activate it
1509         if (best) {
1510                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1511                          best->aggregator_identifier, best->num_of_ports,
1512                          best->actor_oper_aggregator_key,
1513                          best->partner_oper_aggregator_key,
1514                          best->is_individual, best->is_active);
1515                 pr_debug("best ports %p slave %p %s\n",
1516                          best->lag_ports, best->slave,
1517                          best->slave ? best->slave->dev->name : "NULL");
1518
1519                 bond_for_each_slave(bond, slave, iter) {
1520                         agg = &(SLAVE_AD_INFO(slave).aggregator);
1521
1522                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1523                                  agg->aggregator_identifier, agg->num_of_ports,
1524                                  agg->actor_oper_aggregator_key,
1525                                  agg->partner_oper_aggregator_key,
1526                                  agg->is_individual, agg->is_active);
1527                 }
1528
1529                 // check if any partner replys
1530                 if (best->is_individual) {
1531                         pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1532                                    best->slave ? best->slave->bond->dev->name : "NULL");
1533                 }
1534
1535                 best->is_active = 1;
1536                 pr_debug("LAG %d chosen as the active LAG\n",
1537                          best->aggregator_identifier);
1538                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1539                          best->aggregator_identifier, best->num_of_ports,
1540                          best->actor_oper_aggregator_key,
1541                          best->partner_oper_aggregator_key,
1542                          best->is_individual, best->is_active);
1543
1544                 // disable the ports that were related to the former active_aggregator
1545                 if (active) {
1546                         for (port = active->lag_ports; port;
1547                              port = port->next_port_in_aggregator) {
1548                                 __disable_port(port);
1549                         }
1550                 }
1551         }
1552
1553         /*
1554          * if the selected aggregator is of join individuals
1555          * (partner_system is NULL), enable their ports
1556          */
1557         active = __get_active_agg(origin);
1558
1559         if (active) {
1560                 if (!__agg_has_partner(active)) {
1561                         for (port = active->lag_ports; port;
1562                              port = port->next_port_in_aggregator) {
1563                                 __enable_port(port);
1564                         }
1565                 }
1566         }
1567
1568         bond_3ad_set_carrier(bond);
1569 }
1570
1571 /**
1572  * ad_clear_agg - clear a given aggregator's parameters
1573  * @aggregator: the aggregator we're looking at
1574  *
1575  */
1576 static void ad_clear_agg(struct aggregator *aggregator)
1577 {
1578         if (aggregator) {
1579                 aggregator->is_individual = false;
1580                 aggregator->actor_admin_aggregator_key = 0;
1581                 aggregator->actor_oper_aggregator_key = 0;
1582                 aggregator->partner_system = null_mac_addr;
1583                 aggregator->partner_system_priority = 0;
1584                 aggregator->partner_oper_aggregator_key = 0;
1585                 aggregator->receive_state = 0;
1586                 aggregator->transmit_state = 0;
1587                 aggregator->lag_ports = NULL;
1588                 aggregator->is_active = 0;
1589                 aggregator->num_of_ports = 0;
1590                 pr_debug("LAG %d was cleared\n",
1591                          aggregator->aggregator_identifier);
1592         }
1593 }
1594
1595 /**
1596  * ad_initialize_agg - initialize a given aggregator's parameters
1597  * @aggregator: the aggregator we're looking at
1598  *
1599  */
1600 static void ad_initialize_agg(struct aggregator *aggregator)
1601 {
1602         if (aggregator) {
1603                 ad_clear_agg(aggregator);
1604
1605                 aggregator->aggregator_mac_address = null_mac_addr;
1606                 aggregator->aggregator_identifier = 0;
1607                 aggregator->slave = NULL;
1608         }
1609 }
1610
1611 /**
1612  * ad_initialize_port - initialize a given port's parameters
1613  * @aggregator: the aggregator we're looking at
1614  * @lacp_fast: boolean. whether fast periodic should be used
1615  *
1616  */
1617 static void ad_initialize_port(struct port *port, int lacp_fast)
1618 {
1619         static const struct port_params tmpl = {
1620                 .system_priority = 0xffff,
1621                 .key             = 1,
1622                 .port_number     = 1,
1623                 .port_priority   = 0xff,
1624                 .port_state      = 1,
1625         };
1626         static const struct lacpdu lacpdu = {
1627                 .subtype                = 0x01,
1628                 .version_number = 0x01,
1629                 .tlv_type_actor_info = 0x01,
1630                 .actor_information_length = 0x14,
1631                 .tlv_type_partner_info = 0x02,
1632                 .partner_information_length = 0x14,
1633                 .tlv_type_collector_info = 0x03,
1634                 .collector_information_length = 0x10,
1635                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1636         };
1637
1638         if (port) {
1639                 port->actor_port_number = 1;
1640                 port->actor_port_priority = 0xff;
1641                 port->actor_system = null_mac_addr;
1642                 port->actor_system_priority = 0xffff;
1643                 port->actor_port_aggregator_identifier = 0;
1644                 port->ntt = false;
1645                 port->actor_admin_port_key = 1;
1646                 port->actor_oper_port_key  = 1;
1647                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1648                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1649
1650                 if (lacp_fast)
1651                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1652
1653                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1654                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1655
1656                 port->is_enabled = true;
1657                 // ****** private parameters ******
1658                 port->sm_vars = 0x3;
1659                 port->sm_rx_state = 0;
1660                 port->sm_rx_timer_counter = 0;
1661                 port->sm_periodic_state = 0;
1662                 port->sm_periodic_timer_counter = 0;
1663                 port->sm_mux_state = 0;
1664                 port->sm_mux_timer_counter = 0;
1665                 port->sm_tx_state = 0;
1666                 port->sm_tx_timer_counter = 0;
1667                 port->slave = NULL;
1668                 port->aggregator = NULL;
1669                 port->next_port_in_aggregator = NULL;
1670                 port->transaction_id = 0;
1671
1672                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1673         }
1674 }
1675
1676 /**
1677  * ad_enable_collecting_distributing - enable a port's transmit/receive
1678  * @port: the port we're looking at
1679  *
1680  * Enable @port if it's in an active aggregator
1681  */
1682 static void ad_enable_collecting_distributing(struct port *port)
1683 {
1684         if (port->aggregator->is_active) {
1685                 pr_debug("Enabling port %d(LAG %d)\n",
1686                          port->actor_port_number,
1687                          port->aggregator->aggregator_identifier);
1688                 __enable_port(port);
1689         }
1690 }
1691
1692 /**
1693  * ad_disable_collecting_distributing - disable a port's transmit/receive
1694  * @port: the port we're looking at
1695  *
1696  */
1697 static void ad_disable_collecting_distributing(struct port *port)
1698 {
1699         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1700                 pr_debug("Disabling port %d(LAG %d)\n",
1701                          port->actor_port_number,
1702                          port->aggregator->aggregator_identifier);
1703                 __disable_port(port);
1704         }
1705 }
1706
1707 #if 0
1708 /**
1709  * ad_marker_info_send - send a marker information frame
1710  * @port: the port we're looking at
1711  *
1712  * This function does nothing since we decided not to implement send and handle
1713  * response for marker PDU's, in this stage, but only to respond to marker
1714  * information.
1715  */
1716 static void ad_marker_info_send(struct port *port)
1717 {
1718         struct bond_marker marker;
1719         u16 index;
1720
1721         // fill the marker PDU with the appropriate values
1722         marker.subtype = 0x02;
1723         marker.version_number = 0x01;
1724         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1725         marker.marker_length = 0x16;
1726         // convert requester_port to Big Endian
1727         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1728         marker.requester_system = port->actor_system;
1729         // convert requester_port(u32) to Big Endian
1730         marker.requester_transaction_id =
1731                 (((++port->transaction_id & 0xFF) << 24)
1732                  | ((port->transaction_id & 0xFF00) << 8)
1733                  | ((port->transaction_id & 0xFF0000) >> 8)
1734                  | ((port->transaction_id & 0xFF000000) >> 24));
1735         marker.pad = 0;
1736         marker.tlv_type_terminator = 0x00;
1737         marker.terminator_length = 0x00;
1738         for (index = 0; index < 90; index++)
1739                 marker.reserved_90[index] = 0;
1740
1741         // send the marker information
1742         if (ad_marker_send(port, &marker) >= 0) {
1743                 pr_debug("Sent Marker Information on port %d\n",
1744                          port->actor_port_number);
1745         }
1746 }
1747 #endif
1748
1749 /**
1750  * ad_marker_info_received - handle receive of a Marker information frame
1751  * @marker_info: Marker info received
1752  * @port: the port we're looking at
1753  *
1754  */
1755 static void ad_marker_info_received(struct bond_marker *marker_info,
1756         struct port *port)
1757 {
1758         struct bond_marker marker;
1759
1760         // copy the received marker data to the response marker
1761         //marker = *marker_info;
1762         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1763         // change the marker subtype to marker response
1764         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1765         // send the marker response
1766
1767         if (ad_marker_send(port, &marker) >= 0) {
1768                 pr_debug("Sent Marker Response on port %d\n",
1769                          port->actor_port_number);
1770         }
1771 }
1772
1773 /**
1774  * ad_marker_response_received - handle receive of a marker response frame
1775  * @marker: marker PDU received
1776  * @port: the port we're looking at
1777  *
1778  * This function does nothing since we decided not to implement send and handle
1779  * response for marker PDU's, in this stage, but only to respond to marker
1780  * information.
1781  */
1782 static void ad_marker_response_received(struct bond_marker *marker,
1783         struct port *port)
1784 {
1785         marker = NULL; /* just to satisfy the compiler */
1786         port = NULL;  /* just to satisfy the compiler */
1787         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1788 }
1789
1790 //////////////////////////////////////////////////////////////////////////////////////
1791 // ================= AD exported functions to the main bonding code ==================
1792 //////////////////////////////////////////////////////////////////////////////////////
1793
1794 // Check aggregators status in team every T seconds
1795 #define AD_AGGREGATOR_SELECTION_TIMER  8
1796
1797 /*
1798  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1799  *
1800  * Set the aggregation selection timer, to initiate an agg selection in
1801  * the very near future.  Called during first initialization, and during
1802  * any down to up transitions of the bond.
1803  */
1804 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1805 {
1806         BOND_AD_INFO(bond).agg_select_timer = timeout;
1807 }
1808
1809 static u16 aggregator_identifier;
1810
1811 /**
1812  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1813  * @bond: bonding struct to work on
1814  * @tick_resolution: tick duration (millisecond resolution)
1815  *
1816  * Can be called only after the mac address of the bond is set.
1817  */
1818 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1819 {
1820         // check that the bond is not initialized yet
1821         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1822                                 bond->dev->dev_addr)) {
1823
1824                 aggregator_identifier = 0;
1825
1826                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1827                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1828
1829                 // initialize how many times this module is called in one second(should be about every 100ms)
1830                 ad_ticks_per_sec = tick_resolution;
1831
1832                 bond_3ad_initiate_agg_selection(bond,
1833                                                 AD_AGGREGATOR_SELECTION_TIMER *
1834                                                 ad_ticks_per_sec);
1835         }
1836 }
1837
1838 /**
1839  * bond_3ad_bind_slave - initialize a slave's port
1840  * @slave: slave struct to work on
1841  *
1842  * Returns:   0 on success
1843  *          < 0 on error
1844  */
1845 int bond_3ad_bind_slave(struct slave *slave)
1846 {
1847         struct bonding *bond = bond_get_bond_by_slave(slave);
1848         struct port *port;
1849         struct aggregator *aggregator;
1850
1851         if (bond == NULL) {
1852                 pr_err("%s: The slave %s is not attached to its bond\n",
1853                        slave->bond->dev->name, slave->dev->name);
1854                 return -1;
1855         }
1856
1857         //check that the slave has not been initialized yet.
1858         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1859
1860                 // port initialization
1861                 port = &(SLAVE_AD_INFO(slave).port);
1862
1863                 ad_initialize_port(port, bond->params.lacp_fast);
1864
1865                 __initialize_port_locks(slave);
1866                 port->slave = slave;
1867                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1868                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1869                 //              ------------------------------------------------------------
1870                 // Port key :   | User key                       |      Speed       |Duplex|
1871                 //              ------------------------------------------------------------
1872                 //              16                               6               1 0
1873                 port->actor_admin_port_key = 0; // initialize this parameter
1874                 port->actor_admin_port_key |= __get_duplex(port);
1875                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1876                 port->actor_oper_port_key = port->actor_admin_port_key;
1877                 // if the port is not full duplex, then the port should be not lacp Enabled
1878                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1879                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1880                 // actor system is the bond's system
1881                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1882                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1883                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1884                 port->aggregator = NULL;
1885                 port->next_port_in_aggregator = NULL;
1886
1887                 __disable_port(port);
1888
1889                 // aggregator initialization
1890                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1891
1892                 ad_initialize_agg(aggregator);
1893
1894                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1895                 aggregator->aggregator_identifier = (++aggregator_identifier);
1896                 aggregator->slave = slave;
1897                 aggregator->is_active = 0;
1898                 aggregator->num_of_ports = 0;
1899         }
1900
1901         return 0;
1902 }
1903
1904 /**
1905  * bond_3ad_unbind_slave - deinitialize a slave's port
1906  * @slave: slave struct to work on
1907  *
1908  * Search for the aggregator that is related to this port, remove the
1909  * aggregator and assign another aggregator for other port related to it
1910  * (if any), and remove the port.
1911  */
1912 void bond_3ad_unbind_slave(struct slave *slave)
1913 {
1914         struct port *port, *prev_port, *temp_port;
1915         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1916         int select_new_active_agg = 0;
1917         struct bonding *bond = slave->bond;
1918         struct slave *slave_iter;
1919         struct list_head *iter;
1920
1921         // find the aggregator related to this slave
1922         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1923
1924         // find the port related to this slave
1925         port = &(SLAVE_AD_INFO(slave).port);
1926
1927         // if slave is null, the whole port is not initialized
1928         if (!port->slave) {
1929                 pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1930                            slave->bond->dev->name, slave->dev->name);
1931                 return;
1932         }
1933
1934         pr_debug("Unbinding Link Aggregation Group %d\n",
1935                  aggregator->aggregator_identifier);
1936
1937         /* Tell the partner that this port is not suitable for aggregation */
1938         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1939         __update_lacpdu_from_port(port);
1940         ad_lacpdu_send(port);
1941
1942         // check if this aggregator is occupied
1943         if (aggregator->lag_ports) {
1944                 // check if there are other ports related to this aggregator except
1945                 // the port related to this slave(thats ensure us that there is a
1946                 // reason to search for new aggregator, and that we will find one
1947                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1948                         // find new aggregator for the related port(s)
1949                         bond_for_each_slave(bond, slave_iter, iter) {
1950                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
1951                                 // if the new aggregator is empty, or it is connected to our port only
1952                                 if (!new_aggregator->lag_ports
1953                                     || ((new_aggregator->lag_ports == port)
1954                                         && !new_aggregator->lag_ports->next_port_in_aggregator))
1955                                         break;
1956                         }
1957                         if (!slave_iter)
1958                                 new_aggregator = NULL;
1959                         // if new aggregator found, copy the aggregator's parameters
1960                         // and connect the related lag_ports to the new aggregator
1961                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1962                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
1963                                          aggregator->aggregator_identifier,
1964                                          new_aggregator->aggregator_identifier);
1965
1966                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1967                                         pr_info("%s: Removing an active aggregator\n",
1968                                                 aggregator->slave->bond->dev->name);
1969                                         // select new active aggregator
1970                                          select_new_active_agg = 1;
1971                                 }
1972
1973                                 new_aggregator->is_individual = aggregator->is_individual;
1974                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1975                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1976                                 new_aggregator->partner_system = aggregator->partner_system;
1977                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1978                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1979                                 new_aggregator->receive_state = aggregator->receive_state;
1980                                 new_aggregator->transmit_state = aggregator->transmit_state;
1981                                 new_aggregator->lag_ports = aggregator->lag_ports;
1982                                 new_aggregator->is_active = aggregator->is_active;
1983                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
1984
1985                                 // update the information that is written on the ports about the aggregator
1986                                 for (temp_port = aggregator->lag_ports; temp_port;
1987                                      temp_port = temp_port->next_port_in_aggregator) {
1988                                         temp_port->aggregator = new_aggregator;
1989                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1990                                 }
1991
1992                                 // clear the aggregator
1993                                 ad_clear_agg(aggregator);
1994
1995                                 if (select_new_active_agg)
1996                                         ad_agg_selection_logic(__get_first_agg(port));
1997                         } else {
1998                                 pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
1999                                            slave->bond->dev->name);
2000                         }
2001                 } else { // in case that the only port related to this aggregator is the one we want to remove
2002                         select_new_active_agg = aggregator->is_active;
2003                         // clear the aggregator
2004                         ad_clear_agg(aggregator);
2005                         if (select_new_active_agg) {
2006                                 pr_info("%s: Removing an active aggregator\n",
2007                                         slave->bond->dev->name);
2008                                 // select new active aggregator
2009                                 temp_aggregator = __get_first_agg(port);
2010                                 if (temp_aggregator)
2011                                         ad_agg_selection_logic(temp_aggregator);
2012                         }
2013                 }
2014         }
2015
2016         pr_debug("Unbinding port %d\n", port->actor_port_number);
2017         // find the aggregator that this port is connected to
2018         bond_for_each_slave(bond, slave_iter, iter) {
2019                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
2020                 prev_port = NULL;
2021                 // search the port in the aggregator's related ports
2022                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2023                      prev_port = temp_port,
2024                              temp_port = temp_port->next_port_in_aggregator) {
2025                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2026                                 if (prev_port)
2027                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2028                                 else
2029                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2030                                 temp_aggregator->num_of_ports--;
2031                                 if (temp_aggregator->num_of_ports == 0) {
2032                                         select_new_active_agg = temp_aggregator->is_active;
2033                                         // clear the aggregator
2034                                         ad_clear_agg(temp_aggregator);
2035                                         if (select_new_active_agg) {
2036                                                 pr_info("%s: Removing an active aggregator\n",
2037                                                         slave->bond->dev->name);
2038                                                 // select new active aggregator
2039                                                 ad_agg_selection_logic(__get_first_agg(port));
2040                                         }
2041                                 }
2042                                 break;
2043                         }
2044                 }
2045         }
2046         port->slave = NULL;
2047 }
2048
2049 /**
2050  * bond_3ad_state_machine_handler - handle state machines timeout
2051  * @bond: bonding struct to work on
2052  *
2053  * The state machine handling concept in this module is to check every tick
2054  * which state machine should operate any function. The execution order is
2055  * round robin, so when we have an interaction between state machines, the
2056  * reply of one to each other might be delayed until next tick.
2057  *
2058  * This function also complete the initialization when the agg_select_timer
2059  * times out, and it selects an aggregator for the ports that are yet not
2060  * related to any aggregator, and selects the active aggregator for a bond.
2061  */
2062 void bond_3ad_state_machine_handler(struct work_struct *work)
2063 {
2064         struct bonding *bond = container_of(work, struct bonding,
2065                                             ad_work.work);
2066         struct aggregator *aggregator;
2067         struct list_head *iter;
2068         struct slave *slave;
2069         struct port *port;
2070
2071         read_lock(&bond->lock);
2072
2073         //check if there are any slaves
2074         if (!bond_has_slaves(bond))
2075                 goto re_arm;
2076
2077         // check if agg_select_timer timer after initialize is timed out
2078         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2079                 slave = bond_first_slave(bond);
2080                 port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
2081
2082                 // select the active aggregator for the bond
2083                 if (port) {
2084                         if (!port->slave) {
2085                                 pr_warning("%s: Warning: bond's first port is uninitialized\n",
2086                                            bond->dev->name);
2087                                 goto re_arm;
2088                         }
2089
2090                         aggregator = __get_first_agg(port);
2091                         ad_agg_selection_logic(aggregator);
2092                 }
2093                 bond_3ad_set_carrier(bond);
2094         }
2095
2096         // for each port run the state machines
2097         bond_for_each_slave(bond, slave, iter) {
2098                 port = &(SLAVE_AD_INFO(slave).port);
2099                 if (!port->slave) {
2100                         pr_warning("%s: Warning: Found an uninitialized port\n",
2101                                    bond->dev->name);
2102                         goto re_arm;
2103                 }
2104
2105                 /* Lock around state machines to protect data accessed
2106                  * by all (e.g., port->sm_vars).  ad_rx_machine may run
2107                  * concurrently due to incoming LACPDU.
2108                  */
2109                 __get_state_machine_lock(port);
2110
2111                 ad_rx_machine(NULL, port);
2112                 ad_periodic_machine(port);
2113                 ad_port_selection_logic(port);
2114                 ad_mux_machine(port);
2115                 ad_tx_machine(port);
2116
2117                 // turn off the BEGIN bit, since we already handled it
2118                 if (port->sm_vars & AD_PORT_BEGIN)
2119                         port->sm_vars &= ~AD_PORT_BEGIN;
2120
2121                 __release_state_machine_lock(port);
2122         }
2123
2124 re_arm:
2125         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2126
2127         read_unlock(&bond->lock);
2128 }
2129
2130 /**
2131  * bond_3ad_rx_indication - handle a received frame
2132  * @lacpdu: received lacpdu
2133  * @slave: slave struct to work on
2134  * @length: length of the data received
2135  *
2136  * It is assumed that frames that were sent on this NIC don't returned as new
2137  * received frames (loopback). Since only the payload is given to this
2138  * function, it check for loopback.
2139  */
2140 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2141 {
2142         struct port *port;
2143         int ret = RX_HANDLER_ANOTHER;
2144
2145         if (length >= sizeof(struct lacpdu)) {
2146
2147                 port = &(SLAVE_AD_INFO(slave).port);
2148
2149                 if (!port->slave) {
2150                         pr_warning("%s: Warning: port of slave %s is uninitialized\n",
2151                                    slave->dev->name, slave->bond->dev->name);
2152                         return ret;
2153                 }
2154
2155                 switch (lacpdu->subtype) {
2156                 case AD_TYPE_LACPDU:
2157                         ret = RX_HANDLER_CONSUMED;
2158                         pr_debug("Received LACPDU on port %d\n",
2159                                  port->actor_port_number);
2160                         /* Protect against concurrent state machines */
2161                         __get_state_machine_lock(port);
2162                         ad_rx_machine(lacpdu, port);
2163                         __release_state_machine_lock(port);
2164                         break;
2165
2166                 case AD_TYPE_MARKER:
2167                         ret = RX_HANDLER_CONSUMED;
2168                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2169
2170                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2171                         case AD_MARKER_INFORMATION_SUBTYPE:
2172                                 pr_debug("Received Marker Information on port %d\n",
2173                                          port->actor_port_number);
2174                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2175                                 break;
2176
2177                         case AD_MARKER_RESPONSE_SUBTYPE:
2178                                 pr_debug("Received Marker Response on port %d\n",
2179                                          port->actor_port_number);
2180                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2181                                 break;
2182
2183                         default:
2184                                 pr_debug("Received an unknown Marker subtype on slot %d\n",
2185                                          port->actor_port_number);
2186                         }
2187                 }
2188         }
2189         return ret;
2190 }
2191
2192 /**
2193  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2194  * @slave: slave struct to work on
2195  *
2196  * Handle reselection of aggregator (if needed) for this port.
2197  */
2198 void bond_3ad_adapter_speed_changed(struct slave *slave)
2199 {
2200         struct port *port;
2201
2202         port = &(SLAVE_AD_INFO(slave).port);
2203
2204         /* if slave is null, the whole port is not initialized */
2205         if (!port->slave) {
2206                 pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
2207                            slave->bond->dev->name, slave->dev->name);
2208                 return;
2209         }
2210
2211         __get_state_machine_lock(port);
2212
2213         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2214         port->actor_oper_port_key = port->actor_admin_port_key |=
2215                 (__get_link_speed(port) << 1);
2216         pr_debug("Port %d changed speed\n", port->actor_port_number);
2217         /* there is no need to reselect a new aggregator, just signal the
2218          * state machines to reinitialize
2219          */
2220         port->sm_vars |= AD_PORT_BEGIN;
2221
2222         __release_state_machine_lock(port);
2223 }
2224
2225 /**
2226  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2227  * @slave: slave struct to work on
2228  *
2229  * Handle reselection of aggregator (if needed) for this port.
2230  */
2231 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2232 {
2233         struct port *port;
2234
2235         port = &(SLAVE_AD_INFO(slave).port);
2236
2237         /* if slave is null, the whole port is not initialized */
2238         if (!port->slave) {
2239                 pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
2240                            slave->bond->dev->name, slave->dev->name);
2241                 return;
2242         }
2243
2244         __get_state_machine_lock(port);
2245
2246         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2247         port->actor_oper_port_key = port->actor_admin_port_key |=
2248                 __get_duplex(port);
2249         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2250         /* there is no need to reselect a new aggregator, just signal the
2251          * state machines to reinitialize
2252          */
2253         port->sm_vars |= AD_PORT_BEGIN;
2254
2255         __release_state_machine_lock(port);
2256 }
2257
2258 /**
2259  * bond_3ad_handle_link_change - handle a slave's link status change indication
2260  * @slave: slave struct to work on
2261  * @status: whether the link is now up or down
2262  *
2263  * Handle reselection of aggregator (if needed) for this port.
2264  */
2265 void bond_3ad_handle_link_change(struct slave *slave, char link)
2266 {
2267         struct port *port;
2268
2269         port = &(SLAVE_AD_INFO(slave).port);
2270
2271         /* if slave is null, the whole port is not initialized */
2272         if (!port->slave) {
2273                 pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
2274                            slave->bond->dev->name, slave->dev->name);
2275                 return;
2276         }
2277
2278         __get_state_machine_lock(port);
2279         /* on link down we are zeroing duplex and speed since
2280          * some of the adaptors(ce1000.lan) report full duplex/speed
2281          * instead of N/A(duplex) / 0(speed).
2282          *
2283          * on link up we are forcing recheck on the duplex and speed since
2284          * some of he adaptors(ce1000.lan) report.
2285          */
2286         if (link == BOND_LINK_UP) {
2287                 port->is_enabled = true;
2288                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2289                 port->actor_oper_port_key = port->actor_admin_port_key |=
2290                         __get_duplex(port);
2291                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2292                 port->actor_oper_port_key = port->actor_admin_port_key |=
2293                         (__get_link_speed(port) << 1);
2294         } else {
2295                 /* link has failed */
2296                 port->is_enabled = false;
2297                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2298                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2299                                              ~AD_SPEED_KEY_BITS);
2300         }
2301         pr_debug("Port %d changed link status to %s",
2302                 port->actor_port_number,
2303                 (link == BOND_LINK_UP) ? "UP" : "DOWN");
2304         /* there is no need to reselect a new aggregator, just signal the
2305          * state machines to reinitialize
2306          */
2307         port->sm_vars |= AD_PORT_BEGIN;
2308
2309         __release_state_machine_lock(port);
2310 }
2311
2312 /*
2313  * set link state for bonding master: if we have an active
2314  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2315  * have an active aggregator if there are no slaves with link up.
2316  *
2317  * This behavior complies with IEEE 802.3 section 43.3.9.
2318  *
2319  * Called by bond_set_carrier(). Return zero if carrier state does not
2320  * change, nonzero if it does.
2321  */
2322 int bond_3ad_set_carrier(struct bonding *bond)
2323 {
2324         struct aggregator *active;
2325         struct slave *first_slave;
2326
2327         first_slave = bond_first_slave(bond);
2328         if (!first_slave)
2329                 return 0;
2330         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
2331         if (active) {
2332                 /* are enough slaves available to consider link up? */
2333                 if (active->num_of_ports < bond->params.min_links) {
2334                         if (netif_carrier_ok(bond->dev)) {
2335                                 netif_carrier_off(bond->dev);
2336                                 return 1;
2337                         }
2338                 } else if (!netif_carrier_ok(bond->dev)) {
2339                         netif_carrier_on(bond->dev);
2340                         return 1;
2341                 }
2342                 return 0;
2343         }
2344
2345         if (netif_carrier_ok(bond->dev)) {
2346                 netif_carrier_off(bond->dev);
2347                 return 1;
2348         }
2349         return 0;
2350 }
2351
2352 /**
2353  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2354  * @bond: bonding struct to work on
2355  * @ad_info: ad_info struct to fill with the bond's info
2356  *
2357  * Returns:   0 on success
2358  *          < 0 on error
2359  */
2360 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2361                                    struct ad_info *ad_info)
2362 {
2363         struct aggregator *aggregator = NULL;
2364         struct list_head *iter;
2365         struct slave *slave;
2366         struct port *port;
2367
2368         bond_for_each_slave_rcu(bond, slave, iter) {
2369                 port = &(SLAVE_AD_INFO(slave).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 /* Wrapper used to hold bond->lock so no slave manipulation can occur */
2389 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2390 {
2391         int ret;
2392
2393         rcu_read_lock();
2394         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2395         rcu_read_unlock();
2396
2397         return ret;
2398 }
2399
2400 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2401 {
2402         struct bonding *bond = netdev_priv(dev);
2403         struct slave *slave, *first_ok_slave;
2404         struct aggregator *agg;
2405         struct ad_info ad_info;
2406         struct list_head *iter;
2407         int slaves_in_agg;
2408         int slave_agg_no;
2409         int res = 1;
2410         int agg_id;
2411
2412         if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2413                 pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
2414                          dev->name);
2415                 goto out;
2416         }
2417
2418         slaves_in_agg = ad_info.ports;
2419         agg_id = ad_info.aggregator_id;
2420
2421         if (slaves_in_agg == 0) {
2422                 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2423                 goto out;
2424         }
2425
2426         slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
2427         first_ok_slave = NULL;
2428
2429         bond_for_each_slave_rcu(bond, slave, iter) {
2430                 agg = SLAVE_AD_INFO(slave).port.aggregator;
2431                 if (!agg || agg->aggregator_identifier != agg_id)
2432                         continue;
2433
2434                 if (slave_agg_no >= 0) {
2435                         if (!first_ok_slave && SLAVE_IS_OK(slave))
2436                                 first_ok_slave = slave;
2437                         slave_agg_no--;
2438                         continue;
2439                 }
2440
2441                 if (SLAVE_IS_OK(slave)) {
2442                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2443                         goto out;
2444                 }
2445         }
2446
2447         if (slave_agg_no >= 0) {
2448                 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2449                        dev->name, agg_id);
2450                 goto out;
2451         }
2452
2453         /* we couldn't find any suitable slave after the agg_no, so use the
2454          * first suitable found, if found. */
2455         if (first_ok_slave)
2456                 res = bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2457
2458 out:
2459         if (res) {
2460                 /* no suitable interface, frame not sent */
2461                 kfree_skb(skb);
2462         }
2463
2464         return NETDEV_TX_OK;
2465 }
2466
2467 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2468                          struct slave *slave)
2469 {
2470         int ret = RX_HANDLER_ANOTHER;
2471         struct lacpdu *lacpdu, _lacpdu;
2472
2473         if (skb->protocol != PKT_TYPE_LACPDU)
2474                 return ret;
2475
2476         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2477         if (!lacpdu)
2478                 return ret;
2479
2480         read_lock(&bond->lock);
2481         ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
2482         read_unlock(&bond->lock);
2483         return ret;
2484 }
2485
2486 /*
2487  * When modify lacp_rate parameter via sysfs,
2488  * update actor_oper_port_state of each port.
2489  *
2490  * Hold slave->state_machine_lock,
2491  * so we can modify port->actor_oper_port_state,
2492  * no matter bond is up or down.
2493  */
2494 void bond_3ad_update_lacp_rate(struct bonding *bond)
2495 {
2496         struct port *port = NULL;
2497         struct list_head *iter;
2498         struct slave *slave;
2499         int lacp_fast;
2500
2501         lacp_fast = bond->params.lacp_fast;
2502         bond_for_each_slave(bond, slave, iter) {
2503                 port = &(SLAVE_AD_INFO(slave).port);
2504                 __get_state_machine_lock(port);
2505                 if (lacp_fast)
2506                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2507                 else
2508                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2509                 __release_state_machine_lock(port);
2510         }
2511 }