drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #include <linux/skbuff.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/if_bonding.h>
  30 #include <linux/pkt_sched.h>
  31 #include <net/net_namespace.h>
  32 #include <net/bonding.h>
  33 #include <net/bond_3ad.h>
  34
  35 /* General definitions */
  36 #define AD_SHORT_TIMEOUT           1
  37 #define AD_LONG_TIMEOUT            0
  38 #define AD_STANDBY                 0x2
  39 #define AD_MAX_TX_IN_SECOND        3
  40 #define AD_COLLECTOR_MAX_DELAY     0
  41
  42 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  43 #define AD_FAST_PERIODIC_TIME      1
  44 #define AD_SLOW_PERIODIC_TIME      30
  45 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  46 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  47 #define AD_CHURN_DETECTION_TIME    60
  48 #define AD_AGGREGATE_WAIT_TIME     2
  49
  50 /* Port state definitions (43.4.2.2 in the 802.3ad standard) */
  51 #define AD_STATE_LACP_ACTIVITY   0x1
  52 #define AD_STATE_LACP_TIMEOUT    0x2
  53 #define AD_STATE_AGGREGATION     0x4
  54 #define AD_STATE_SYNCHRONIZATION 0x8
  55 #define AD_STATE_COLLECTING      0x10
  56 #define AD_STATE_DISTRIBUTING    0x20
  57 #define AD_STATE_DEFAULTED       0x40
  58 #define AD_STATE_EXPIRED         0x80
  59
  60 /* Port Variables definitions used by the State Machines (43.4.7 in the
  61  * 802.3ad standard)
  62  */
  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 #define AD_PORT_CHURNED         (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
  74
  75 /* Port Key definitions
  76  * key is determined according to the link speed, duplex and
  77  * user key (which is yet not supported)
  78  *           --------------------------------------------------------------
  79  * Port key  | User key (10 bits)           | Speed (5 bits)      | Duplex|
  80  *           --------------------------------------------------------------
  81  *           |15                           6|5                   1|0
  82  */
  83 #define  AD_DUPLEX_KEY_MASKS    0x1
  84 #define  AD_SPEED_KEY_MASKS     0x3E
  85 #define  AD_USER_KEY_MASKS      0xFFC0
  86
  87 enum ad_link_speed_type {
  88         AD_LINK_SPEED_1MBPS = 1,
  89         AD_LINK_SPEED_10MBPS,
  90         AD_LINK_SPEED_100MBPS,
  91         AD_LINK_SPEED_1000MBPS,
  92         AD_LINK_SPEED_2500MBPS,
  93         AD_LINK_SPEED_10000MBPS,
  94         AD_LINK_SPEED_20000MBPS,
  95         AD_LINK_SPEED_40000MBPS,
  96         AD_LINK_SPEED_56000MBPS,
  97         AD_LINK_SPEED_100000MBPS,
  98 };
  99
 100 /* compare MAC addresses */
 101 #define MAC_ADDRESS_EQUAL(A, B) \
 102         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
 103
 104 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
 105 static u16 ad_ticks_per_sec;
 106 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
 107
 108 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 109
 110 /* ================= main 802.3ad protocol functions ================== */
 111 static int ad_lacpdu_send(struct port *port);
 112 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 113 static void ad_mux_machine(struct port *port, bool *update_slave_arr);
 114 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 115 static void ad_tx_machine(struct port *port);
 116 static void ad_periodic_machine(struct port *port);
 117 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
 118 static void ad_agg_selection_logic(struct aggregator *aggregator,
 119                                    bool *update_slave_arr);
 120 static void ad_clear_agg(struct aggregator *aggregator);
 121 static void ad_initialize_agg(struct aggregator *aggregator);
 122 static void ad_initialize_port(struct port *port, int lacp_fast);
 123 static void ad_enable_collecting_distributing(struct port *port,
 124                                               bool *update_slave_arr);
 125 static void ad_disable_collecting_distributing(struct port *port,
 126                                                bool *update_slave_arr);
 127 static void ad_marker_info_received(struct bond_marker *marker_info,
 128                                     struct port *port);
 129 static void ad_marker_response_received(struct bond_marker *marker,
 130                                         struct port *port);
 131 static void ad_update_actor_keys(struct port *port, bool reset);
 132
 133
 134 /* ================= api to bonding and kernel code ================== */
 135
 136 /**
 137  * __get_bond_by_port - get the port's bonding struct
 138  * @port: the port we're looking at
 139  *
 140  * Return @port's bonding struct, or %NULL if it can't be found.
 141  */
 142 static inline struct bonding *__get_bond_by_port(struct port *port)
 143 {
 144         if (port->slave == NULL)
 145                 return NULL;
 146
 147         return bond_get_bond_by_slave(port->slave);
 148 }
 149
 150 /**
 151  * __get_first_agg - get the first aggregator in the bond
 152  * @bond: the bond we're looking at
 153  *
 154  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 155  * found.
 156  * The caller must hold RCU or RTNL lock.
 157  */
 158 static inline struct aggregator *__get_first_agg(struct port *port)
 159 {
 160         struct bonding *bond = __get_bond_by_port(port);
 161         struct slave *first_slave;
 162         struct aggregator *agg;
 163
 164         /* If there's no bond for this port, or bond has no slaves */
 165         if (bond == NULL)
 166                 return NULL;
 167
 168         rcu_read_lock();
 169         first_slave = bond_first_slave_rcu(bond);
 170         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 171         rcu_read_unlock();
 172
 173         return agg;
 174 }
 175
 176 /**
 177  * __agg_has_partner - see if we have a partner
 178  * @agg: the agregator we're looking at
 179  *
 180  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 181  * address for the partner). Return 0 if not.
 182  */
 183 static inline int __agg_has_partner(struct aggregator *agg)
 184 {
 185         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 186 }
 187
 188 /**
 189  * __disable_port - disable the port's slave
 190  * @port: the port we're looking at
 191  */
 192 static inline void __disable_port(struct port *port)
 193 {
 194         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 195 }
 196
 197 /**
 198  * __enable_port - enable the port's slave, if it's up
 199  * @port: the port we're looking at
 200  */
 201 static inline void __enable_port(struct port *port)
 202 {
 203         struct slave *slave = port->slave;
 204
 205         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 206                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 207 }
 208
 209 /**
 210  * __port_is_enabled - check if the port's slave is in active state
 211  * @port: the port we're looking at
 212  */
 213 static inline int __port_is_enabled(struct port *port)
 214 {
 215         return bond_is_active_slave(port->slave);
 216 }
 217
 218 /**
 219  * __get_agg_selection_mode - get the aggregator selection mode
 220  * @port: the port we're looking at
 221  *
 222  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 223  */
 224 static inline u32 __get_agg_selection_mode(struct port *port)
 225 {
 226         struct bonding *bond = __get_bond_by_port(port);
 227
 228         if (bond == NULL)
 229                 return BOND_AD_STABLE;
 230
 231         return bond->params.ad_select;
 232 }
 233
 234 /**
 235  * __check_agg_selection_timer - check if the selection timer has expired
 236  * @port: the port we're looking at
 237  */
 238 static inline int __check_agg_selection_timer(struct port *port)
 239 {
 240         struct bonding *bond = __get_bond_by_port(port);
 241
 242         if (bond == NULL)
 243                 return 0;
 244
 245         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 246 }
 247
 248 /**
 249  * __get_link_speed - get a port's speed
 250  * @port: the port we're looking at
 251  *
 252  * Return @port's speed in 802.3ad enum format. i.e. one of:
 253  *     0,
 254  *     %AD_LINK_SPEED_10MBPS,
 255  *     %AD_LINK_SPEED_100MBPS,
 256  *     %AD_LINK_SPEED_1000MBPS,
 257  *     %AD_LINK_SPEED_2500MBPS,
 258  *     %AD_LINK_SPEED_10000MBPS
 259  *     %AD_LINK_SPEED_20000MBPS
 260  *     %AD_LINK_SPEED_40000MBPS
 261  *     %AD_LINK_SPEED_56000MBPS
 262  *     %AD_LINK_SPEED_100000MBPS
 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
 270          * with link down, it sets the speed to 0.
 271          * This is done in spite of the fact that the e100 driver reports 0
 272          * to be compatible with MVT in the future.
 273          */
 274         if (slave->link != BOND_LINK_UP)
 275                 speed = 0;
 276         else {
 277                 switch (slave->speed) {
 278                 case SPEED_10:
 279                         speed = AD_LINK_SPEED_10MBPS;
 280                         break;
 281
 282                 case SPEED_100:
 283                         speed = AD_LINK_SPEED_100MBPS;
 284                         break;
 285
 286                 case SPEED_1000:
 287                         speed = AD_LINK_SPEED_1000MBPS;
 288                         break;
 289
 290                 case SPEED_2500:
 291                         speed = AD_LINK_SPEED_2500MBPS;
 292                         break;
 293
 294                 case SPEED_10000:
 295                         speed = AD_LINK_SPEED_10000MBPS;
 296                         break;
 297
 298                 case SPEED_20000:
 299                         speed = AD_LINK_SPEED_20000MBPS;
 300                         break;
 301
 302                 case SPEED_40000:
 303                         speed = AD_LINK_SPEED_40000MBPS;
 304                         break;
 305
 306                 case SPEED_56000:
 307                         speed = AD_LINK_SPEED_56000MBPS;
 308                         break;
 309
 310                 case SPEED_100000:
 311                         speed = AD_LINK_SPEED_100000MBPS;
 312                         break;
 313
 314                 default:
 315                         /* unknown speed value from ethtool. shouldn't happen */
 316                         speed = 0;
 317                         break;
 318                 }
 319         }
 320
 321         netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
 322                    port->actor_port_number, speed);
 323         return speed;
 324 }
 325
 326 /**
 327  * __get_duplex - get a port's duplex
 328  * @port: the port we're looking at
 329  *
 330  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 331  *     0x01 if in full duplex
 332  *     0x00 otherwise
 333  */
 334 static u8 __get_duplex(struct port *port)
 335 {
 336         struct slave *slave = port->slave;
 337         u8 retval = 0x0;
 338
 339         /* handling a special case: when the configuration starts with
 340          * link down, it sets the duplex to 0.
 341          */
 342         if (slave->link == BOND_LINK_UP) {
 343                 switch (slave->duplex) {
 344                 case DUPLEX_FULL:
 345                         retval = 0x1;
 346                         netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
 347                                    port->actor_port_number);
 348                         break;
 349                 case DUPLEX_HALF:
 350                 default:
 351                         retval = 0x0;
 352                         netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
 353                                    port->actor_port_number);
 354                         break;
 355                 }
 356         }
 357         return retval;
 358 }
 359
 360 /* Conversions */
 361
 362 /**
 363  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 364  * @timer_type: which timer to operate
 365  * @par: timer parameter. see below
 366  *
 367  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 368  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 369  *                                                   %SLOW_PERIODIC_TIME.
 370  */
 371 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 372 {
 373         u16 retval = 0; /* to silence the compiler */
 374
 375         switch (timer_type) {
 376         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 377                 if (par)
 378                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 379                 else
 380                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 381                 break;
 382         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 383                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 384                 break;
 385         case AD_PERIODIC_TIMER:         /* for periodic machine */
 386                 retval = (par*ad_ticks_per_sec); /* long timeout */
 387                 break;
 388         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 389                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 390                 break;
 391         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 392                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 393                 break;
 394         }
 395
 396         return retval;
 397 }
 398
 399
 400 /* ================= ad_rx_machine helper functions ================== */
 401
 402 /**
 403  * __choose_matched - update a port's matched variable from a received lacpdu
 404  * @lacpdu: the lacpdu we've received
 405  * @port: the port we're looking at
 406  *
 407  * Update the value of the matched variable, using parameter values from a
 408  * newly received lacpdu. Parameter values for the partner carried in the
 409  * received PDU are compared with the corresponding operational parameter
 410  * values for the actor. Matched is set to TRUE if all of these parameters
 411  * match and the PDU parameter partner_state.aggregation has the same value as
 412  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 413  * in the aggregation. Matched is also set to TRUE if the value of
 414  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 415  * an individual link and lacp will actively maintain the link. Otherwise,
 416  * matched is set to FALSE. LACP is considered to be actively maintaining the
 417  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 418  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 419  * partner_state.lacp_activity variables are TRUE.
 420  *
 421  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 422  * used here to implement the language from 802.3ad 43.4.9 that requires
 423  * recordPDU to "match" the LACPDU parameters to the stored values.
 424  */
 425 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 426 {
 427         /* check if all parameters are alike
 428          * or this is individual link(aggregation == FALSE)
 429          * then update the state machine Matched variable.
 430          */
 431         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 432              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 433              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 434              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 435              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 436              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 437             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 438                 ) {
 439                 port->sm_vars |= AD_PORT_MATCHED;
 440         } else {
 441                 port->sm_vars &= ~AD_PORT_MATCHED;
 442         }
 443 }
 444
 445 /**
 446  * __record_pdu - record parameters from a received lacpdu
 447  * @lacpdu: the lacpdu we've received
 448  * @port: the port we're looking at
 449  *
 450  * Record the parameter values for the Actor carried in a received lacpdu as
 451  * the current partner operational parameter values and sets
 452  * actor_oper_port_state.defaulted to FALSE.
 453  */
 454 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 455 {
 456         if (lacpdu && port) {
 457                 struct port_params *partner = &port->partner_oper;
 458
 459                 __choose_matched(lacpdu, port);
 460                 /* record the new parameter values for the partner
 461                  * operational
 462                  */
 463                 partner->port_number = ntohs(lacpdu->actor_port);
 464                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 465                 partner->system = lacpdu->actor_system;
 466                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 467                 partner->key = ntohs(lacpdu->actor_key);
 468                 partner->port_state = lacpdu->actor_state;
 469
 470                 /* set actor_oper_port_state.defaulted to FALSE */
 471                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 472
 473                 /* set the partner sync. to on if the partner is sync,
 474                  * and the port is matched
 475                  */
 476                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 477                     (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 478                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 479                         pr_debug("%s partner sync=1\n", port->slave->dev->name);
 480                 } else {
 481                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 482                         pr_debug("%s partner sync=0\n", port->slave->dev->name);
 483                 }
 484         }
 485 }
 486
 487 /**
 488  * __record_default - record default parameters
 489  * @port: the port we're looking at
 490  *
 491  * This function records the default parameter values for the partner carried
 492  * in the Partner Admin parameters as the current partner operational parameter
 493  * values and sets actor_oper_port_state.defaulted to TRUE.
 494  */
 495 static void __record_default(struct port *port)
 496 {
 497         if (port) {
 498                 /* record the partner admin parameters */
 499                 memcpy(&port->partner_oper, &port->partner_admin,
 500                        sizeof(struct port_params));
 501
 502                 /* set actor_oper_port_state.defaulted to true */
 503                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 504         }
 505 }
 506
 507 /**
 508  * __update_selected - update a port's Selected variable from a received lacpdu
 509  * @lacpdu: the lacpdu we've received
 510  * @port: the port we're looking at
 511  *
 512  * Update the value of the selected variable, using parameter values from a
 513  * newly received lacpdu. The parameter values for the Actor carried in the
 514  * received PDU are compared with the corresponding operational parameter
 515  * values for the ports partner. If one or more of the comparisons shows that
 516  * the value(s) received in the PDU differ from the current operational values,
 517  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 518  * set to out_of_sync. Otherwise, selected remains unchanged.
 519  */
 520 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 521 {
 522         if (lacpdu && port) {
 523                 const struct port_params *partner = &port->partner_oper;
 524
 525                 /* check if any parameter is different then
 526                  * update the state machine selected variable.
 527                  */
 528                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 529                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 530                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 531                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 532                     ntohs(lacpdu->actor_key) != partner->key ||
 533                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 534                         port->sm_vars &= ~AD_PORT_SELECTED;
 535                 }
 536         }
 537 }
 538
 539 /**
 540  * __update_default_selected - update a port's Selected variable from Partner
 541  * @port: the port we're looking at
 542  *
 543  * This function updates the value of the selected variable, using the partner
 544  * administrative parameter values. The administrative values are compared with
 545  * the corresponding operational parameter values for the partner. If one or
 546  * more of the comparisons shows that the administrative value(s) differ from
 547  * the current operational values, then Selected is set to FALSE and
 548  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 549  * Selected remains unchanged.
 550  */
 551 static void __update_default_selected(struct port *port)
 552 {
 553         if (port) {
 554                 const struct port_params *admin = &port->partner_admin;
 555                 const struct port_params *oper = &port->partner_oper;
 556
 557                 /* check if any parameter is different then
 558                  * update the state machine selected variable.
 559                  */
 560                 if (admin->port_number != oper->port_number ||
 561                     admin->port_priority != oper->port_priority ||
 562                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 563                     admin->system_priority != oper->system_priority ||
 564                     admin->key != oper->key ||
 565                     (admin->port_state & AD_STATE_AGGREGATION)
 566                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 567                         port->sm_vars &= ~AD_PORT_SELECTED;
 568                 }
 569         }
 570 }
 571
 572 /**
 573  * __update_ntt - update a port's ntt variable from a received lacpdu
 574  * @lacpdu: the lacpdu we've received
 575  * @port: the port we're looking at
 576  *
 577  * Updates the value of the ntt variable, using parameter values from a newly
 578  * received lacpdu. The parameter values for the partner carried in the
 579  * received PDU are compared with the corresponding operational parameter
 580  * values for the Actor. If one or more of the comparisons shows that the
 581  * value(s) received in the PDU differ from the current operational values,
 582  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 583  */
 584 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 585 {
 586         /* validate lacpdu and port */
 587         if (lacpdu && port) {
 588                 /* check if any parameter is different then
 589                  * update the port->ntt.
 590                  */
 591                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 592                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 593                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 594                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 595                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 596                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 597                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 598                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 599                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 600                    ) {
 601                         port->ntt = true;
 602                 }
 603         }
 604 }
 605
 606 /**
 607  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 608  * @aggregator: the aggregator we're looking at
 609  *
 610  */
 611 static int __agg_ports_are_ready(struct aggregator *aggregator)
 612 {
 613         struct port *port;
 614         int retval = 1;
 615
 616         if (aggregator) {
 617                 /* scan all ports in this aggregator to verfy if they are
 618                  * all ready.
 619                  */
 620                 for (port = aggregator->lag_ports;
 621                      port;
 622                      port = port->next_port_in_aggregator) {
 623                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 624                                 retval = 0;
 625                                 break;
 626                         }
 627                 }
 628         }
 629
 630         return retval;
 631 }
 632
 633 /**
 634  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 635  * @aggregator: the aggregator we're looking at
 636  * @val: Should the ports' ready bit be set on or off
 637  *
 638  */
 639 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 640 {
 641         struct port *port;
 642
 643         for (port = aggregator->lag_ports; port;
 644              port = port->next_port_in_aggregator) {
 645                 if (val)
 646                         port->sm_vars |= AD_PORT_READY;
 647                 else
 648                         port->sm_vars &= ~AD_PORT_READY;
 649         }
 650 }
 651
 652 /**
 653  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 654  * @aggregator: the aggregator we're looking at
 655  *
 656  */
 657 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 658 {
 659         u32 bandwidth = 0;
 660
 661         if (aggregator->num_of_ports) {
 662                 switch (__get_link_speed(aggregator->lag_ports)) {
 663                 case AD_LINK_SPEED_1MBPS:
 664                         bandwidth = aggregator->num_of_ports;
 665                         break;
 666                 case AD_LINK_SPEED_10MBPS:
 667                         bandwidth = aggregator->num_of_ports * 10;
 668                         break;
 669                 case AD_LINK_SPEED_100MBPS:
 670                         bandwidth = aggregator->num_of_ports * 100;
 671                         break;
 672                 case AD_LINK_SPEED_1000MBPS:
 673                         bandwidth = aggregator->num_of_ports * 1000;
 674                         break;
 675                 case AD_LINK_SPEED_2500MBPS:
 676                         bandwidth = aggregator->num_of_ports * 2500;
 677                         break;
 678                 case AD_LINK_SPEED_10000MBPS:
 679                         bandwidth = aggregator->num_of_ports * 10000;
 680                         break;
 681                 case AD_LINK_SPEED_20000MBPS:
 682                         bandwidth = aggregator->num_of_ports * 20000;
 683                         break;
 684                 case AD_LINK_SPEED_40000MBPS:
 685                         bandwidth = aggregator->num_of_ports * 40000;
 686                         break;
 687                 case AD_LINK_SPEED_56000MBPS:
 688                         bandwidth = aggregator->num_of_ports * 56000;
 689                         break;
 690                 case AD_LINK_SPEED_100000MBPS:
 691                         bandwidth = aggregator->num_of_ports * 100000;
 692                         break;
 693                 default:
 694                         bandwidth = 0; /* to silence the compiler */
 695                 }
 696         }
 697         return bandwidth;
 698 }
 699
 700 /**
 701  * __get_active_agg - get the current active aggregator
 702  * @aggregator: the aggregator we're looking at
 703  *
 704  * Caller must hold RCU lock.
 705  */
 706 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 707 {
 708         struct bonding *bond = aggregator->slave->bond;
 709         struct list_head *iter;
 710         struct slave *slave;
 711
 712         bond_for_each_slave_rcu(bond, slave, iter)
 713                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 714                         return &(SLAVE_AD_INFO(slave)->aggregator);
 715
 716         return NULL;
 717 }
 718
 719 /**
 720  * __update_lacpdu_from_port - update a port's lacpdu fields
 721  * @port: the port we're looking at
 722  */
 723 static inline void __update_lacpdu_from_port(struct port *port)
 724 {
 725         struct lacpdu *lacpdu = &port->lacpdu;
 726         const struct port_params *partner = &port->partner_oper;
 727
 728         /* update current actual Actor parameters
 729          * lacpdu->subtype                   initialized
 730          * lacpdu->version_number            initialized
 731          * lacpdu->tlv_type_actor_info       initialized
 732          * lacpdu->actor_information_length  initialized
 733          */
 734
 735         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 736         lacpdu->actor_system = port->actor_system;
 737         lacpdu->actor_key = htons(port->actor_oper_port_key);
 738         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 739         lacpdu->actor_port = htons(port->actor_port_number);
 740         lacpdu->actor_state = port->actor_oper_port_state;
 741         pr_debug("update lacpdu: %s, actor port state %x\n",
 742                  port->slave->dev->name, port->actor_oper_port_state);
 743
 744         /* lacpdu->reserved_3_1              initialized
 745          * lacpdu->tlv_type_partner_info     initialized
 746          * lacpdu->partner_information_length initialized
 747          */
 748
 749         lacpdu->partner_system_priority = htons(partner->system_priority);
 750         lacpdu->partner_system = partner->system;
 751         lacpdu->partner_key = htons(partner->key);
 752         lacpdu->partner_port_priority = htons(partner->port_priority);
 753         lacpdu->partner_port = htons(partner->port_number);
 754         lacpdu->partner_state = partner->port_state;
 755
 756         /* lacpdu->reserved_3_2              initialized
 757          * lacpdu->tlv_type_collector_info   initialized
 758          * lacpdu->collector_information_length initialized
 759          * collector_max_delay                initialized
 760          * reserved_12[12]                   initialized
 761          * tlv_type_terminator               initialized
 762          * terminator_length                 initialized
 763          * reserved_50[50]                   initialized
 764          */
 765 }
 766
 767 /* ================= main 802.3ad protocol code ========================= */
 768
 769 /**
 770  * ad_lacpdu_send - send out a lacpdu packet on a given port
 771  * @port: the port we're looking at
 772  *
 773  * Returns:   0 on success
 774  *          < 0 on error
 775  */
 776 static int ad_lacpdu_send(struct port *port)
 777 {
 778         struct slave *slave = port->slave;
 779         struct sk_buff *skb;
 780         struct lacpdu_header *lacpdu_header;
 781         int length = sizeof(struct lacpdu_header);
 782
 783         skb = dev_alloc_skb(length);
 784         if (!skb)
 785                 return -ENOMEM;
 786
 787         skb->dev = slave->dev;
 788         skb_reset_mac_header(skb);
 789         skb->network_header = skb->mac_header + ETH_HLEN;
 790         skb->protocol = PKT_TYPE_LACPDU;
 791         skb->priority = TC_PRIO_CONTROL;
 792
 793         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 794
 795         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 796         /* Note: source address is set to be the member's PERMANENT address,
 797          * because we use it to identify loopback lacpdus in receive.
 798          */
 799         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 800         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 801
 802         lacpdu_header->lacpdu = port->lacpdu;
 803
 804         dev_queue_xmit(skb);
 805
 806         return 0;
 807 }
 808
 809 /**
 810  * ad_marker_send - send marker information/response on a given port
 811  * @port: the port we're looking at
 812  * @marker: marker data to send
 813  *
 814  * Returns:   0 on success
 815  *          < 0 on error
 816  */
 817 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 818 {
 819         struct slave *slave = port->slave;
 820         struct sk_buff *skb;
 821         struct bond_marker_header *marker_header;
 822         int length = sizeof(struct bond_marker_header);
 823
 824         skb = dev_alloc_skb(length + 16);
 825         if (!skb)
 826                 return -ENOMEM;
 827
 828         skb_reserve(skb, 16);
 829
 830         skb->dev = slave->dev;
 831         skb_reset_mac_header(skb);
 832         skb->network_header = skb->mac_header + ETH_HLEN;
 833         skb->protocol = PKT_TYPE_LACPDU;
 834
 835         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 836
 837         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 838         /* Note: source address is set to be the member's PERMANENT address,
 839          * because we use it to identify loopback MARKERs in receive.
 840          */
 841         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 842         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 843
 844         marker_header->marker = *marker;
 845
 846         dev_queue_xmit(skb);
 847
 848         return 0;
 849 }
 850
 851 /**
 852  * ad_mux_machine - handle a port's mux state machine
 853  * @port: the port we're looking at
 854  * @update_slave_arr: Does slave array need update?
 855  */
 856 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 857 {
 858         mux_states_t last_state;
 859
 860         /* keep current State Machine state to compare later if it was
 861          * changed
 862          */
 863         last_state = port->sm_mux_state;
 864
 865         if (port->sm_vars & AD_PORT_BEGIN) {
 866                 port->sm_mux_state = AD_MUX_DETACHED;
 867         } else {
 868                 switch (port->sm_mux_state) {
 869                 case AD_MUX_DETACHED:
 870                         if ((port->sm_vars & AD_PORT_SELECTED)
 871                             || (port->sm_vars & AD_PORT_STANDBY))
 872                                 /* if SELECTED or STANDBY */
 873                                 port->sm_mux_state = AD_MUX_WAITING;
 874                         break;
 875                 case AD_MUX_WAITING:
 876                         /* if SELECTED == FALSE return to DETACH state */
 877                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 878                                 port->sm_vars &= ~AD_PORT_READY_N;
 879                                 /* in order to withhold the Selection Logic to
 880                                  * check all ports READY_N value every callback
 881                                  * cycle to update ready variable, we check
 882                                  * READY_N and update READY here
 883                                  */
 884                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 885                                 port->sm_mux_state = AD_MUX_DETACHED;
 886                                 break;
 887                         }
 888
 889                         /* check if the wait_while_timer expired */
 890                         if (port->sm_mux_timer_counter
 891                             && !(--port->sm_mux_timer_counter))
 892                                 port->sm_vars |= AD_PORT_READY_N;
 893
 894                         /* in order to withhold the selection logic to check
 895                          * all ports READY_N value every callback cycle to
 896                          * update ready variable, we check READY_N and update
 897                          * READY here
 898                          */
 899                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 900
 901                         /* if the wait_while_timer expired, and the port is
 902                          * in READY state, move to ATTACHED state
 903                          */
 904                         if ((port->sm_vars & AD_PORT_READY)
 905                             && !port->sm_mux_timer_counter)
 906                                 port->sm_mux_state = AD_MUX_ATTACHED;
 907                         break;
 908                 case AD_MUX_ATTACHED:
 909                         /* check also if agg_select_timer expired (so the
 910                          * edable port will take place only after this timer)
 911                          */
 912                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 913                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 914                             !__check_agg_selection_timer(port)) {
 915                                 if (port->aggregator->is_active)
 916                                         port->sm_mux_state =
 917                                             AD_MUX_COLLECTING_DISTRIBUTING;
 918                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 919                                    (port->sm_vars & AD_PORT_STANDBY)) {
 920                                 /* if UNSELECTED or STANDBY */
 921                                 port->sm_vars &= ~AD_PORT_READY_N;
 922                                 /* in order to withhold the selection logic to
 923                                  * check all ports READY_N value every callback
 924                                  * cycle to update ready variable, we check
 925                                  * READY_N and update READY here
 926                                  */
 927                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 928                                 port->sm_mux_state = AD_MUX_DETACHED;
 929                         } else if (port->aggregator->is_active) {
 930                                 port->actor_oper_port_state |=
 931                                     AD_STATE_SYNCHRONIZATION;
 932                         }
 933                         break;
 934                 case AD_MUX_COLLECTING_DISTRIBUTING:
 935                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
 936                             (port->sm_vars & AD_PORT_STANDBY) ||
 937                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
 938                             !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
 939                                 port->sm_mux_state = AD_MUX_ATTACHED;
 940                         } else {
 941                                 /* if port state hasn't changed make
 942                                  * sure that a collecting distributing
 943                                  * port in an active aggregator is enabled
 944                                  */
 945                                 if (port->aggregator &&
 946                                     port->aggregator->is_active &&
 947                                     !__port_is_enabled(port)) {
 948
 949                                         __enable_port(port);
 950                                 }
 951                         }
 952                         break;
 953                 default:
 954                         break;
 955                 }
 956         }
 957
 958         /* check if the state machine was changed */
 959         if (port->sm_mux_state != last_state) {
 960                 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
 961                          port->actor_port_number,
 962                          port->slave->dev->name,
 963                          last_state,
 964                          port->sm_mux_state);
 965                 switch (port->sm_mux_state) {
 966                 case AD_MUX_DETACHED:
 967                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 968                         ad_disable_collecting_distributing(port,
 969                                                            update_slave_arr);
 970                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 971                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 972                         port->ntt = true;
 973                         break;
 974                 case AD_MUX_WAITING:
 975                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 976                         break;
 977                 case AD_MUX_ATTACHED:
 978                         if (port->aggregator->is_active)
 979                                 port->actor_oper_port_state |=
 980                                     AD_STATE_SYNCHRONIZATION;
 981                         else
 982                                 port->actor_oper_port_state &=
 983                                     ~AD_STATE_SYNCHRONIZATION;
 984                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 985                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 986                         ad_disable_collecting_distributing(port,
 987                                                            update_slave_arr);
 988                         port->ntt = true;
 989                         break;
 990                 case AD_MUX_COLLECTING_DISTRIBUTING:
 991                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 992                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 993                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 994                         ad_enable_collecting_distributing(port,
 995                                                           update_slave_arr);
 996                         port->ntt = true;
 997                         break;
 998                 default:
 999                         break;
1000                 }
1001         }
1002 }
1003
1004 /**
1005  * ad_rx_machine - handle a port's rx State Machine
1006  * @lacpdu: the lacpdu we've received
1007  * @port: the port we're looking at
1008  *
1009  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1010  * CURRENT. If timer expired set the state machine in the proper state.
1011  * In other cases, this function checks if we need to switch to other state.
1012  */
1013 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1014 {
1015         rx_states_t last_state;
1016
1017         /* keep current State Machine state to compare later if it was
1018          * changed
1019          */
1020         last_state = port->sm_rx_state;
1021
1022         /* check if state machine should change state */
1023
1024         /* first, check if port was reinitialized */
1025         if (port->sm_vars & AD_PORT_BEGIN) {
1026                 port->sm_rx_state = AD_RX_INITIALIZE;
1027                 port->sm_vars |= AD_PORT_CHURNED;
1028         /* check if port is not enabled */
1029         } else if (!(port->sm_vars & AD_PORT_BEGIN)
1030                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1031                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1032         /* check if new lacpdu arrived */
1033         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1034                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1035                  (port->sm_rx_state == AD_RX_CURRENT))) {
1036                 if (port->sm_rx_state != AD_RX_CURRENT)
1037                         port->sm_vars |= AD_PORT_CHURNED;
1038                 port->sm_rx_timer_counter = 0;
1039                 port->sm_rx_state = AD_RX_CURRENT;
1040         } else {
1041                 /* if timer is on, and if it is expired */
1042                 if (port->sm_rx_timer_counter &&
1043                     !(--port->sm_rx_timer_counter)) {
1044                         switch (port->sm_rx_state) {
1045                         case AD_RX_EXPIRED:
1046                                 port->sm_rx_state = AD_RX_DEFAULTED;
1047                                 break;
1048                         case AD_RX_CURRENT:
1049                                 port->sm_rx_state = AD_RX_EXPIRED;
1050                                 break;
1051                         default:
1052                                 break;
1053                         }
1054                 } else {
1055                         /* if no lacpdu arrived and no timer is on */
1056                         switch (port->sm_rx_state) {
1057                         case AD_RX_PORT_DISABLED:
1058                                 if (port->sm_vars & AD_PORT_MOVED)
1059                                         port->sm_rx_state = AD_RX_INITIALIZE;
1060                                 else if (port->is_enabled
1061                                          && (port->sm_vars
1062                                              & AD_PORT_LACP_ENABLED))
1063                                         port->sm_rx_state = AD_RX_EXPIRED;
1064                                 else if (port->is_enabled
1065                                          && ((port->sm_vars
1066                                               & AD_PORT_LACP_ENABLED) == 0))
1067                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1068                                 break;
1069                         default:
1070                                 break;
1071
1072                         }
1073                 }
1074         }
1075
1076         /* check if the State machine was changed or new lacpdu arrived */
1077         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1078                 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1079                          port->actor_port_number,
1080                          port->slave->dev->name,
1081                          last_state,
1082                          port->sm_rx_state);
1083                 switch (port->sm_rx_state) {
1084                 case AD_RX_INITIALIZE:
1085                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1086                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1087                         else
1088                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1089                         port->sm_vars &= ~AD_PORT_SELECTED;
1090                         __record_default(port);
1091                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1092                         port->sm_vars &= ~AD_PORT_MOVED;
1093                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1094
1095                         /* Fall Through */
1096                 case AD_RX_PORT_DISABLED:
1097                         port->sm_vars &= ~AD_PORT_MATCHED;
1098                         break;
1099                 case AD_RX_LACP_DISABLED:
1100                         port->sm_vars &= ~AD_PORT_SELECTED;
1101                         __record_default(port);
1102                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1103                         port->sm_vars |= AD_PORT_MATCHED;
1104                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1105                         break;
1106                 case AD_RX_EXPIRED:
1107                         /* Reset of the Synchronization flag (Standard 43.4.12)
1108                          * This reset cause to disable this port in the
1109                          * COLLECTING_DISTRIBUTING state of the mux machine in
1110                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1111                          * the port.
1112                          */
1113                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1114                         port->sm_vars &= ~AD_PORT_MATCHED;
1115                         port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1116                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1117                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1118                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1119                         port->sm_vars |= AD_PORT_CHURNED;
1120                         break;
1121                 case AD_RX_DEFAULTED:
1122                         __update_default_selected(port);
1123                         __record_default(port);
1124                         port->sm_vars |= AD_PORT_MATCHED;
1125                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1126                         break;
1127                 case AD_RX_CURRENT:
1128                         /* detect loopback situation */
1129                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1130                                               &(port->actor_system))) {
1131                                 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1132                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1133                                        port->slave->dev->name);
1134                                 return;
1135                         }
1136                         __update_selected(lacpdu, port);
1137                         __update_ntt(lacpdu, port);
1138                         __record_pdu(lacpdu, port);
1139                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1140                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1141                         break;
1142                 default:
1143                         break;
1144                 }
1145         }
1146 }
1147
1148 /**
1149  * ad_churn_machine - handle port churn's state machine
1150  * @port: the port we're looking at
1151  *
1152  */
1153 static void ad_churn_machine(struct port *port)
1154 {
1155         if (port->sm_vars & AD_PORT_CHURNED) {
1156                 port->sm_vars &= ~AD_PORT_CHURNED;
1157                 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1158                 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1159                 port->sm_churn_actor_timer_counter =
1160                         __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1161                  port->sm_churn_partner_timer_counter =
1162                          __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1163                 return;
1164         }
1165         if (port->sm_churn_actor_timer_counter &&
1166             !(--port->sm_churn_actor_timer_counter) &&
1167             port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1168                 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1169                         port->sm_churn_actor_state = AD_NO_CHURN;
1170                 } else {
1171                         port->churn_actor_count++;
1172                         port->sm_churn_actor_state = AD_CHURN;
1173                 }
1174         }
1175         if (port->sm_churn_partner_timer_counter &&
1176             !(--port->sm_churn_partner_timer_counter) &&
1177             port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1178                 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1179                         port->sm_churn_partner_state = AD_NO_CHURN;
1180                 } else {
1181                         port->churn_partner_count++;
1182                         port->sm_churn_partner_state = AD_CHURN;
1183                 }
1184         }
1185 }
1186
1187 /**
1188  * ad_tx_machine - handle a port's tx state machine
1189  * @port: the port we're looking at
1190  */
1191 static void ad_tx_machine(struct port *port)
1192 {
1193         /* check if tx timer expired, to verify that we do not send more than
1194          * 3 packets per second
1195          */
1196         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1197                 /* check if there is something to send */
1198                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1199                         __update_lacpdu_from_port(port);
1200
1201                         if (ad_lacpdu_send(port) >= 0) {
1202                                 pr_debug("Sent LACPDU on port %d\n",
1203                                          port->actor_port_number);
1204
1205                                 /* mark ntt as false, so it will not be sent
1206                                  * again until demanded
1207                                  */
1208                                 port->ntt = false;
1209                         }
1210                 }
1211                 /* restart tx timer(to verify that we will not exceed
1212                  * AD_MAX_TX_IN_SECOND
1213                  */
1214                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1215         }
1216 }
1217
1218 /**
1219  * ad_periodic_machine - handle a port's periodic state machine
1220  * @port: the port we're looking at
1221  *
1222  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1223  */
1224 static void ad_periodic_machine(struct port *port)
1225 {
1226         periodic_states_t last_state;
1227
1228         /* keep current state machine state to compare later if it was changed */
1229         last_state = port->sm_periodic_state;
1230
1231         /* check if port was reinitialized */
1232         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1233             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1234            ) {
1235                 port->sm_periodic_state = AD_NO_PERIODIC;
1236         }
1237         /* check if state machine should change state */
1238         else if (port->sm_periodic_timer_counter) {
1239                 /* check if periodic state machine expired */
1240                 if (!(--port->sm_periodic_timer_counter)) {
1241                         /* if expired then do tx */
1242                         port->sm_periodic_state = AD_PERIODIC_TX;
1243                 } else {
1244                         /* If not expired, check if there is some new timeout
1245                          * parameter from the partner state
1246                          */
1247                         switch (port->sm_periodic_state) {
1248                         case AD_FAST_PERIODIC:
1249                                 if (!(port->partner_oper.port_state
1250                                       & AD_STATE_LACP_TIMEOUT))
1251                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1252                                 break;
1253                         case AD_SLOW_PERIODIC:
1254                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1255                                         port->sm_periodic_timer_counter = 0;
1256                                         port->sm_periodic_state = AD_PERIODIC_TX;
1257                                 }
1258                                 break;
1259                         default:
1260                                 break;
1261                         }
1262                 }
1263         } else {
1264                 switch (port->sm_periodic_state) {
1265                 case AD_NO_PERIODIC:
1266                         port->sm_periodic_state = AD_FAST_PERIODIC;
1267                         break;
1268                 case AD_PERIODIC_TX:
1269                         if (!(port->partner_oper.port_state &
1270                             AD_STATE_LACP_TIMEOUT))
1271                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1272                         else
1273                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1274                         break;
1275                 default:
1276                         break;
1277                 }
1278         }
1279
1280         /* check if the state machine was changed */
1281         if (port->sm_periodic_state != last_state) {
1282                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1283                          port->actor_port_number, last_state,
1284                          port->sm_periodic_state);
1285                 switch (port->sm_periodic_state) {
1286                 case AD_NO_PERIODIC:
1287                         port->sm_periodic_timer_counter = 0;
1288                         break;
1289                 case AD_FAST_PERIODIC:
1290                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1291                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1292                         break;
1293                 case AD_SLOW_PERIODIC:
1294                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1295                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1296                         break;
1297                 case AD_PERIODIC_TX:
1298                         port->ntt = true;
1299                         break;
1300                 default:
1301                         break;
1302                 }
1303         }
1304 }
1305
1306 /**
1307  * ad_port_selection_logic - select aggregation groups
1308  * @port: the port we're looking at
1309  * @update_slave_arr: Does slave array need update?
1310  *
1311  * Select aggregation groups, and assign each port for it's aggregetor. The
1312  * selection logic is called in the inititalization (after all the handshkes),
1313  * and after every lacpdu receive (if selected is off).
1314  */
1315 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1316 {
1317         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1318         struct port *last_port = NULL, *curr_port;
1319         struct list_head *iter;
1320         struct bonding *bond;
1321         struct slave *slave;
1322         int found = 0;
1323
1324         /* if the port is already Selected, do nothing */
1325         if (port->sm_vars & AD_PORT_SELECTED)
1326                 return;
1327
1328         bond = __get_bond_by_port(port);
1329
1330         /* if the port is connected to other aggregator, detach it */
1331         if (port->aggregator) {
1332                 /* detach the port from its former aggregator */
1333                 temp_aggregator = port->aggregator;
1334                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1335                      last_port = curr_port,
1336                      curr_port = curr_port->next_port_in_aggregator) {
1337                         if (curr_port == port) {
1338                                 temp_aggregator->num_of_ports--;
1339                                 /* if it is the first port attached to the
1340                                  * aggregator
1341                                  */
1342                                 if (!last_port) {
1343                                         temp_aggregator->lag_ports =
1344                                                 port->next_port_in_aggregator;
1345                                 } else {
1346                                         /* not the first port attached to the
1347                                          * aggregator
1348                                          */
1349                                         last_port->next_port_in_aggregator =
1350                                                 port->next_port_in_aggregator;
1351                                 }
1352
1353                                 /* clear the port's relations to this
1354                                  * aggregator
1355                                  */
1356                                 port->aggregator = NULL;
1357                                 port->next_port_in_aggregator = NULL;
1358                                 port->actor_port_aggregator_identifier = 0;
1359
1360                                 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1361                                            port->actor_port_number,
1362                                            temp_aggregator->aggregator_identifier);
1363                                 /* if the aggregator is empty, clear its
1364                                  * parameters, and set it ready to be attached
1365                                  */
1366                                 if (!temp_aggregator->lag_ports)
1367                                         ad_clear_agg(temp_aggregator);
1368                                 break;
1369                         }
1370                 }
1371                 if (!curr_port) {
1372                         /* meaning: the port was related to an aggregator
1373                          * but was not on the aggregator port list
1374                          */
1375                         net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1376                                              port->slave->bond->dev->name,
1377                                              port->actor_port_number,
1378                                              port->slave->dev->name,
1379                                              port->aggregator->aggregator_identifier);
1380                 }
1381         }
1382         /* search on all aggregators for a suitable aggregator for this port */
1383         bond_for_each_slave(bond, slave, iter) {
1384                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1385
1386                 /* keep a free aggregator for later use(if needed) */
1387                 if (!aggregator->lag_ports) {
1388                         if (!free_aggregator)
1389                                 free_aggregator = aggregator;
1390                         continue;
1391                 }
1392                 /* check if current aggregator suits us */
1393                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1394                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1395                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1396                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1397                     ) &&
1398                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1399                       !aggregator->is_individual)  /* but is not individual OR */
1400                     )
1401                    ) {
1402                         /* attach to the founded aggregator */
1403                         port->aggregator = aggregator;
1404                         port->actor_port_aggregator_identifier =
1405                                 port->aggregator->aggregator_identifier;
1406                         port->next_port_in_aggregator = aggregator->lag_ports;
1407                         port->aggregator->num_of_ports++;
1408                         aggregator->lag_ports = port;
1409                         netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1410                                    port->actor_port_number,
1411                                    port->aggregator->aggregator_identifier);
1412
1413                         /* mark this port as selected */
1414                         port->sm_vars |= AD_PORT_SELECTED;
1415                         found = 1;
1416                         break;
1417                 }
1418         }
1419
1420         /* the port couldn't find an aggregator - attach it to a new
1421          * aggregator
1422          */
1423         if (!found) {
1424                 if (free_aggregator) {
1425                         /* assign port a new aggregator */
1426                         port->aggregator = free_aggregator;
1427                         port->actor_port_aggregator_identifier =
1428                                 port->aggregator->aggregator_identifier;
1429
1430                         /* update the new aggregator's parameters
1431                          * if port was responsed from the end-user
1432                          */
1433                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1434                                 /* if port is full duplex */
1435                                 port->aggregator->is_individual = false;
1436                         else
1437                                 port->aggregator->is_individual = true;
1438
1439                         port->aggregator->actor_admin_aggregator_key =
1440                                 port->actor_admin_port_key;
1441                         port->aggregator->actor_oper_aggregator_key =
1442                                 port->actor_oper_port_key;
1443                         port->aggregator->partner_system =
1444                                 port->partner_oper.system;
1445                         port->aggregator->partner_system_priority =
1446                                 port->partner_oper.system_priority;
1447                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1448                         port->aggregator->receive_state = 1;
1449                         port->aggregator->transmit_state = 1;
1450                         port->aggregator->lag_ports = port;
1451                         port->aggregator->num_of_ports++;
1452
1453                         /* mark this port as selected */
1454                         port->sm_vars |= AD_PORT_SELECTED;
1455
1456                         netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1457                                    port->actor_port_number,
1458                                    port->aggregator->aggregator_identifier);
1459                 } else {
1460                         netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1461                                port->actor_port_number, port->slave->dev->name);
1462                 }
1463         }
1464         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1465          * in all aggregator's ports, else set ready=FALSE in all
1466          * aggregator's ports
1467          */
1468         __set_agg_ports_ready(port->aggregator,
1469                               __agg_ports_are_ready(port->aggregator));
1470
1471         aggregator = __get_first_agg(port);
1472         ad_agg_selection_logic(aggregator, update_slave_arr);
1473
1474         if (!port->aggregator->is_active)
1475                 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1476 }
1477
1478 /* Decide if "agg" is a better choice for the new active aggregator that
1479  * the current best, according to the ad_select policy.
1480  */
1481 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1482                                                 struct aggregator *curr)
1483 {
1484         /* 0. If no best, select current.
1485          *
1486          * 1. If the current agg is not individual, and the best is
1487          *    individual, select current.
1488          *
1489          * 2. If current agg is individual and the best is not, keep best.
1490          *
1491          * 3. Therefore, current and best are both individual or both not
1492          *    individual, so:
1493          *
1494          * 3a. If current agg partner replied, and best agg partner did not,
1495          *     select current.
1496          *
1497          * 3b. If current agg partner did not reply and best agg partner
1498          *     did reply, keep best.
1499          *
1500          * 4.  Therefore, current and best both have partner replies or
1501          *     both do not, so perform selection policy:
1502          *
1503          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1504          *     select by bandwidth.
1505          *
1506          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1507          */
1508         if (!best)
1509                 return curr;
1510
1511         if (!curr->is_individual && best->is_individual)
1512                 return curr;
1513
1514         if (curr->is_individual && !best->is_individual)
1515                 return best;
1516
1517         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1518                 return curr;
1519
1520         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1521                 return best;
1522
1523         switch (__get_agg_selection_mode(curr->lag_ports)) {
1524         case BOND_AD_COUNT:
1525                 if (curr->num_of_ports > best->num_of_ports)
1526                         return curr;
1527
1528                 if (curr->num_of_ports < best->num_of_ports)
1529                         return best;
1530
1531                 /*FALLTHROUGH*/
1532         case BOND_AD_STABLE:
1533         case BOND_AD_BANDWIDTH:
1534                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1535                         return curr;
1536
1537                 break;
1538
1539         default:
1540                 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1541                                      curr->slave->bond->dev->name,
1542                                      __get_agg_selection_mode(curr->lag_ports));
1543                 break;
1544         }
1545
1546         return best;
1547 }
1548
1549 static int agg_device_up(const struct aggregator *agg)
1550 {
1551         struct port *port = agg->lag_ports;
1552
1553         if (!port)
1554                 return 0;
1555
1556         return netif_running(port->slave->dev) &&
1557                netif_carrier_ok(port->slave->dev);
1558 }
1559
1560 /**
1561  * ad_agg_selection_logic - select an aggregation group for a team
1562  * @aggregator: the aggregator we're looking at
1563  * @update_slave_arr: Does slave array need update?
1564  *
1565  * It is assumed that only one aggregator may be selected for a team.
1566  *
1567  * The logic of this function is to select the aggregator according to
1568  * the ad_select policy:
1569  *
1570  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1571  * it, and to reselect the active aggregator only if the previous
1572  * aggregator has no more ports related to it.
1573  *
1574  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1575  * bandwidth, and reselect whenever a link state change takes place or the
1576  * set of slaves in the bond changes.
1577  *
1578  * BOND_AD_COUNT: select the aggregator with largest number of ports
1579  * (slaves), and reselect whenever a link state change takes place or the
1580  * set of slaves in the bond changes.
1581  *
1582  * FIXME: this function MUST be called with the first agg in the bond, or
1583  * __get_active_agg() won't work correctly. This function should be better
1584  * called with the bond itself, and retrieve the first agg from it.
1585  */
1586 static void ad_agg_selection_logic(struct aggregator *agg,
1587                                    bool *update_slave_arr)
1588 {
1589         struct aggregator *best, *active, *origin;
1590         struct bonding *bond = agg->slave->bond;
1591         struct list_head *iter;
1592         struct slave *slave;
1593         struct port *port;
1594
1595         rcu_read_lock();
1596         origin = agg;
1597         active = __get_active_agg(agg);
1598         best = (active && agg_device_up(active)) ? active : NULL;
1599
1600         bond_for_each_slave_rcu(bond, slave, iter) {
1601                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1602
1603                 agg->is_active = 0;
1604
1605                 if (agg->num_of_ports && agg_device_up(agg))
1606                         best = ad_agg_selection_test(best, agg);
1607         }
1608
1609         if (best &&
1610             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1611                 /* For the STABLE policy, don't replace the old active
1612                  * aggregator if it's still active (it has an answering
1613                  * partner) or if both the best and active don't have an
1614                  * answering partner.
1615                  */
1616                 if (active && active->lag_ports &&
1617                     active->lag_ports->is_enabled &&
1618                     (__agg_has_partner(active) ||
1619                      (!__agg_has_partner(active) &&
1620                      !__agg_has_partner(best)))) {
1621                         if (!(!active->actor_oper_aggregator_key &&
1622                               best->actor_oper_aggregator_key)) {
1623                                 best = NULL;
1624                                 active->is_active = 1;
1625                         }
1626                 }
1627         }
1628
1629         if (best && (best == active)) {
1630                 best = NULL;
1631                 active->is_active = 1;
1632         }
1633
1634         /* if there is new best aggregator, activate it */
1635         if (best) {
1636                 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1637                            best->aggregator_identifier, best->num_of_ports,
1638                            best->actor_oper_aggregator_key,
1639                            best->partner_oper_aggregator_key,
1640                            best->is_individual, best->is_active);
1641                 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1642                            best->lag_ports, best->slave,
1643                            best->slave ? best->slave->dev->name : "NULL");
1644
1645                 bond_for_each_slave_rcu(bond, slave, iter) {
1646                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1647
1648                         netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1649                                    agg->aggregator_identifier, agg->num_of_ports,
1650                                    agg->actor_oper_aggregator_key,
1651                                    agg->partner_oper_aggregator_key,
1652                                    agg->is_individual, agg->is_active);
1653                 }
1654
1655                 /* check if any partner replys */
1656                 if (best->is_individual) {
1657                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1658                                              best->slave ?
1659                                              best->slave->bond->dev->name : "NULL");
1660                 }
1661
1662                 best->is_active = 1;
1663                 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1664                            best->aggregator_identifier);
1665                 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1666                            best->aggregator_identifier, best->num_of_ports,
1667                            best->actor_oper_aggregator_key,
1668                            best->partner_oper_aggregator_key,
1669                            best->is_individual, best->is_active);
1670
1671                 /* disable the ports that were related to the former
1672                  * active_aggregator
1673                  */
1674                 if (active) {
1675                         for (port = active->lag_ports; port;
1676                              port = port->next_port_in_aggregator) {
1677                                 __disable_port(port);
1678                         }
1679                 }
1680                 /* Slave array needs update. */
1681                 *update_slave_arr = true;
1682         }
1683
1684         /* if the selected aggregator is of join individuals
1685          * (partner_system is NULL), enable their ports
1686          */
1687         active = __get_active_agg(origin);
1688
1689         if (active) {
1690                 if (!__agg_has_partner(active)) {
1691                         for (port = active->lag_ports; port;
1692                              port = port->next_port_in_aggregator) {
1693                                 __enable_port(port);
1694                         }
1695                 }
1696         }
1697
1698         rcu_read_unlock();
1699
1700         bond_3ad_set_carrier(bond);
1701 }
1702
1703 /**
1704  * ad_clear_agg - clear a given aggregator's parameters
1705  * @aggregator: the aggregator we're looking at
1706  */
1707 static void ad_clear_agg(struct aggregator *aggregator)
1708 {
1709         if (aggregator) {
1710                 aggregator->is_individual = false;
1711                 aggregator->actor_admin_aggregator_key = 0;
1712                 aggregator->actor_oper_aggregator_key = 0;
1713                 aggregator->partner_system = null_mac_addr;
1714                 aggregator->partner_system_priority = 0;
1715                 aggregator->partner_oper_aggregator_key = 0;
1716                 aggregator->receive_state = 0;
1717                 aggregator->transmit_state = 0;
1718                 aggregator->lag_ports = NULL;
1719                 aggregator->is_active = 0;
1720                 aggregator->num_of_ports = 0;
1721                 pr_debug("LAG %d was cleared\n",
1722                          aggregator->aggregator_identifier);
1723         }
1724 }
1725
1726 /**
1727  * ad_initialize_agg - initialize a given aggregator's parameters
1728  * @aggregator: the aggregator we're looking at
1729  */
1730 static void ad_initialize_agg(struct aggregator *aggregator)
1731 {
1732         if (aggregator) {
1733                 ad_clear_agg(aggregator);
1734
1735                 aggregator->aggregator_mac_address = null_mac_addr;
1736                 aggregator->aggregator_identifier = 0;
1737                 aggregator->slave = NULL;
1738         }
1739 }
1740
1741 /**
1742  * ad_initialize_port - initialize a given port's parameters
1743  * @aggregator: the aggregator we're looking at
1744  * @lacp_fast: boolean. whether fast periodic should be used
1745  */
1746 static void ad_initialize_port(struct port *port, int lacp_fast)
1747 {
1748         static const struct port_params tmpl = {
1749                 .system_priority = 0xffff,
1750                 .key             = 1,
1751                 .port_number     = 1,
1752                 .port_priority   = 0xff,
1753                 .port_state      = 1,
1754         };
1755         static const struct lacpdu lacpdu = {
1756                 .subtype                = 0x01,
1757                 .version_number = 0x01,
1758                 .tlv_type_actor_info = 0x01,
1759                 .actor_information_length = 0x14,
1760                 .tlv_type_partner_info = 0x02,
1761                 .partner_information_length = 0x14,
1762                 .tlv_type_collector_info = 0x03,
1763                 .collector_information_length = 0x10,
1764                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1765         };
1766
1767         if (port) {
1768                 port->actor_port_priority = 0xff;
1769                 port->actor_port_aggregator_identifier = 0;
1770                 port->ntt = false;
1771                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1772                                                AD_STATE_LACP_ACTIVITY;
1773                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1774                                                AD_STATE_LACP_ACTIVITY;
1775
1776                 if (lacp_fast)
1777                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1778
1779                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1780                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1781
1782                 port->is_enabled = true;
1783                 /* private parameters */
1784                 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1785                 port->sm_rx_state = 0;
1786                 port->sm_rx_timer_counter = 0;
1787                 port->sm_periodic_state = 0;
1788                 port->sm_periodic_timer_counter = 0;
1789                 port->sm_mux_state = 0;
1790                 port->sm_mux_timer_counter = 0;
1791                 port->sm_tx_state = 0;
1792                 port->aggregator = NULL;
1793                 port->next_port_in_aggregator = NULL;
1794                 port->transaction_id = 0;
1795
1796                 port->sm_churn_actor_timer_counter = 0;
1797                 port->sm_churn_actor_state = 0;
1798                 port->churn_actor_count = 0;
1799                 port->sm_churn_partner_timer_counter = 0;
1800                 port->sm_churn_partner_state = 0;
1801                 port->churn_partner_count = 0;
1802
1803                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1804         }
1805 }
1806
1807 /**
1808  * ad_enable_collecting_distributing - enable a port's transmit/receive
1809  * @port: the port we're looking at
1810  * @update_slave_arr: Does slave array need update?
1811  *
1812  * Enable @port if it's in an active aggregator
1813  */
1814 static void ad_enable_collecting_distributing(struct port *port,
1815                                               bool *update_slave_arr)
1816 {
1817         if (port->aggregator->is_active) {
1818                 pr_debug("Enabling port %d(LAG %d)\n",
1819                          port->actor_port_number,
1820                          port->aggregator->aggregator_identifier);
1821                 __enable_port(port);
1822                 /* Slave array needs update */
1823                 *update_slave_arr = true;
1824         }
1825 }
1826
1827 /**
1828  * ad_disable_collecting_distributing - disable a port's transmit/receive
1829  * @port: the port we're looking at
1830  * @update_slave_arr: Does slave array need update?
1831  */
1832 static void ad_disable_collecting_distributing(struct port *port,
1833                                                bool *update_slave_arr)
1834 {
1835         if (port->aggregator &&
1836             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1837                                &(null_mac_addr))) {
1838                 pr_debug("Disabling port %d(LAG %d)\n",
1839                          port->actor_port_number,
1840                          port->aggregator->aggregator_identifier);
1841                 __disable_port(port);
1842                 /* Slave array needs an update */
1843                 *update_slave_arr = true;
1844         }
1845 }
1846
1847 /**
1848  * ad_marker_info_received - handle receive of a Marker information frame
1849  * @marker_info: Marker info received
1850  * @port: the port we're looking at
1851  */
1852 static void ad_marker_info_received(struct bond_marker *marker_info,
1853         struct port *port)
1854 {
1855         struct bond_marker marker;
1856
1857         /* copy the received marker data to the response marker */
1858         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1859         /* change the marker subtype to marker response */
1860         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1861
1862         /* send the marker response */
1863         if (ad_marker_send(port, &marker) >= 0) {
1864                 pr_debug("Sent Marker Response on port %d\n",
1865                          port->actor_port_number);
1866         }
1867 }
1868
1869 /**
1870  * ad_marker_response_received - handle receive of a marker response frame
1871  * @marker: marker PDU received
1872  * @port: the port we're looking at
1873  *
1874  * This function does nothing since we decided not to implement send and handle
1875  * response for marker PDU's, in this stage, but only to respond to marker
1876  * information.
1877  */
1878 static void ad_marker_response_received(struct bond_marker *marker,
1879                                         struct port *port)
1880 {
1881         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1882 }
1883
1884 /* ========= AD exported functions to the main bonding code ========= */
1885
1886 /* Check aggregators status in team every T seconds */
1887 #define AD_AGGREGATOR_SELECTION_TIMER  8
1888
1889 /**
1890  * bond_3ad_initiate_agg_selection - initate aggregator selection
1891  * @bond: bonding struct
1892  *
1893  * Set the aggregation selection timer, to initiate an agg selection in
1894  * the very near future.  Called during first initialization, and during
1895  * any down to up transitions of the bond.
1896  */
1897 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1898 {
1899         BOND_AD_INFO(bond).agg_select_timer = timeout;
1900 }
1901
1902 /**
1903  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1904  * @bond: bonding struct to work on
1905  * @tick_resolution: tick duration (millisecond resolution)
1906  *
1907  * Can be called only after the mac address of the bond is set.
1908  */
1909 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1910 {
1911         /* check that the bond is not initialized yet */
1912         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1913                                 bond->dev->dev_addr)) {
1914
1915                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1916
1917                 BOND_AD_INFO(bond).system.sys_priority =
1918                         bond->params.ad_actor_sys_prio;
1919                 if (is_zero_ether_addr(bond->params.ad_actor_system))
1920                         BOND_AD_INFO(bond).system.sys_mac_addr =
1921                             *((struct mac_addr *)bond->dev->dev_addr);
1922                 else
1923                         BOND_AD_INFO(bond).system.sys_mac_addr =
1924                             *((struct mac_addr *)bond->params.ad_actor_system);
1925
1926                 /* initialize how many times this module is called in one
1927                  * second (should be about every 100ms)
1928                  */
1929                 ad_ticks_per_sec = tick_resolution;
1930
1931                 bond_3ad_initiate_agg_selection(bond,
1932                                                 AD_AGGREGATOR_SELECTION_TIMER *
1933                                                 ad_ticks_per_sec);
1934         }
1935 }
1936
1937 /**
1938  * bond_3ad_bind_slave - initialize a slave's port
1939  * @slave: slave struct to work on
1940  *
1941  * Returns:   0 on success
1942  *          < 0 on error
1943  */
1944 void bond_3ad_bind_slave(struct slave *slave)
1945 {
1946         struct bonding *bond = bond_get_bond_by_slave(slave);
1947         struct port *port;
1948         struct aggregator *aggregator;
1949
1950         /* check that the slave has not been initialized yet. */
1951         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1952
1953                 /* port initialization */
1954                 port = &(SLAVE_AD_INFO(slave)->port);
1955
1956                 ad_initialize_port(port, bond->params.lacp_fast);
1957
1958                 port->slave = slave;
1959                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
1960                 /* key is determined according to the link speed, duplex and
1961                  * user key
1962                  */
1963                 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
1964                 ad_update_actor_keys(port, false);
1965                 /* actor system is the bond's system */
1966                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1967                 port->actor_system_priority =
1968                     BOND_AD_INFO(bond).system.sys_priority;
1969                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1970                  * lacpdu's are sent in one second)
1971                  */
1972                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1973
1974                 __disable_port(port);
1975
1976                 /* aggregator initialization */
1977                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1978
1979                 ad_initialize_agg(aggregator);
1980
1981                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1982                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1983                 aggregator->slave = slave;
1984                 aggregator->is_active = 0;
1985                 aggregator->num_of_ports = 0;
1986         }
1987 }
1988
1989 /**
1990  * bond_3ad_unbind_slave - deinitialize a slave's port
1991  * @slave: slave struct to work on
1992  *
1993  * Search for the aggregator that is related to this port, remove the
1994  * aggregator and assign another aggregator for other port related to it
1995  * (if any), and remove the port.
1996  */
1997 void bond_3ad_unbind_slave(struct slave *slave)
1998 {
1999         struct port *port, *prev_port, *temp_port;
2000         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2001         int select_new_active_agg = 0;
2002         struct bonding *bond = slave->bond;
2003         struct slave *slave_iter;
2004         struct list_head *iter;
2005         bool dummy_slave_update; /* Ignore this value as caller updates array */
2006
2007         /* Sync against bond_3ad_state_machine_handler() */
2008         spin_lock_bh(&bond->mode_lock);
2009         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2010         port = &(SLAVE_AD_INFO(slave)->port);
2011
2012         /* if slave is null, the whole port is not initialized */
2013         if (!port->slave) {
2014                 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
2015                             slave->dev->name);
2016                 goto out;
2017         }
2018
2019         netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
2020                    aggregator->aggregator_identifier);
2021
2022         /* Tell the partner that this port is not suitable for aggregation */
2023         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2024         __update_lacpdu_from_port(port);
2025         ad_lacpdu_send(port);
2026
2027         /* check if this aggregator is occupied */
2028         if (aggregator->lag_ports) {
2029                 /* check if there are other ports related to this aggregator
2030                  * except the port related to this slave(thats ensure us that
2031                  * there is a reason to search for new aggregator, and that we
2032                  * will find one
2033                  */
2034                 if ((aggregator->lag_ports != port) ||
2035                     (aggregator->lag_ports->next_port_in_aggregator)) {
2036                         /* find new aggregator for the related port(s) */
2037                         bond_for_each_slave(bond, slave_iter, iter) {
2038                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2039                                 /* if the new aggregator is empty, or it is
2040                                  * connected to our port only
2041                                  */
2042                                 if (!new_aggregator->lag_ports ||
2043                                     ((new_aggregator->lag_ports == port) &&
2044                                      !new_aggregator->lag_ports->next_port_in_aggregator))
2045                                         break;
2046                         }
2047                         if (!slave_iter)
2048                                 new_aggregator = NULL;
2049
2050                         /* if new aggregator found, copy the aggregator's
2051                          * parameters and connect the related lag_ports to the
2052                          * new aggregator
2053                          */
2054                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2055                                 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2056                                            aggregator->aggregator_identifier,
2057                                            new_aggregator->aggregator_identifier);
2058
2059                                 if ((new_aggregator->lag_ports == port) &&
2060                                     new_aggregator->is_active) {
2061                                         netdev_info(bond->dev, "Removing an active aggregator\n");
2062                                          select_new_active_agg = 1;
2063                                 }
2064
2065                                 new_aggregator->is_individual = aggregator->is_individual;
2066                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2067                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2068                                 new_aggregator->partner_system = aggregator->partner_system;
2069                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2070                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2071                                 new_aggregator->receive_state = aggregator->receive_state;
2072                                 new_aggregator->transmit_state = aggregator->transmit_state;
2073                                 new_aggregator->lag_ports = aggregator->lag_ports;
2074                                 new_aggregator->is_active = aggregator->is_active;
2075                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2076
2077                                 /* update the information that is written on
2078                                  * the ports about the aggregator
2079                                  */
2080                                 for (temp_port = aggregator->lag_ports; temp_port;
2081                                      temp_port = temp_port->next_port_in_aggregator) {
2082                                         temp_port->aggregator = new_aggregator;
2083                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2084                                 }
2085
2086                                 ad_clear_agg(aggregator);
2087
2088                                 if (select_new_active_agg)
2089                                         ad_agg_selection_logic(__get_first_agg(port),
2090                                                                &dummy_slave_update);
2091                         } else {
2092                                 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2093                         }
2094                 } else {
2095                         /* in case that the only port related to this
2096                          * aggregator is the one we want to remove
2097                          */
2098                         select_new_active_agg = aggregator->is_active;
2099                         ad_clear_agg(aggregator);
2100                         if (select_new_active_agg) {
2101                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2102                                 /* select new active aggregator */
2103                                 temp_aggregator = __get_first_agg(port);
2104                                 if (temp_aggregator)
2105                                         ad_agg_selection_logic(temp_aggregator,
2106                                                                &dummy_slave_update);
2107                         }
2108                 }
2109         }
2110
2111         netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
2112
2113         /* find the aggregator that this port is connected to */
2114         bond_for_each_slave(bond, slave_iter, iter) {
2115                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2116                 prev_port = NULL;
2117                 /* search the port in the aggregator's related ports */
2118                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2119                      prev_port = temp_port,
2120                      temp_port = temp_port->next_port_in_aggregator) {
2121                         if (temp_port == port) {
2122                                 /* the aggregator found - detach the port from
2123                                  * this aggregator
2124                                  */
2125                                 if (prev_port)
2126                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2127                                 else
2128                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2129                                 temp_aggregator->num_of_ports--;
2130                                 if (temp_aggregator->num_of_ports == 0) {
2131                                         select_new_active_agg = temp_aggregator->is_active;
2132                                         ad_clear_agg(temp_aggregator);
2133                                         if (select_new_active_agg) {
2134                                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2135                                                 /* select new active aggregator */
2136                                                 ad_agg_selection_logic(__get_first_agg(port),
2137                                                                        &dummy_slave_update);
2138                                         }
2139                                 }
2140                                 break;
2141                         }
2142                 }
2143         }
2144         port->slave = NULL;
2145
2146 out:
2147         spin_unlock_bh(&bond->mode_lock);
2148 }
2149
2150 /**
2151  * bond_3ad_state_machine_handler - handle state machines timeout
2152  * @bond: bonding struct to work on
2153  *
2154  * The state machine handling concept in this module is to check every tick
2155  * which state machine should operate any function. The execution order is
2156  * round robin, so when we have an interaction between state machines, the
2157  * reply of one to each other might be delayed until next tick.
2158  *
2159  * This function also complete the initialization when the agg_select_timer
2160  * times out, and it selects an aggregator for the ports that are yet not
2161  * related to any aggregator, and selects the active aggregator for a bond.
2162  */
2163 void bond_3ad_state_machine_handler(struct work_struct *work)
2164 {
2165         struct bonding *bond = container_of(work, struct bonding,
2166                                             ad_work.work);
2167         struct aggregator *aggregator;
2168         struct list_head *iter;
2169         struct slave *slave;
2170         struct port *port;
2171         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2172         bool update_slave_arr = false;
2173
2174         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2175          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2176          * concurrently due to incoming LACPDU as well.
2177          */
2178         spin_lock_bh(&bond->mode_lock);
2179         rcu_read_lock();
2180
2181         /* check if there are any slaves */
2182         if (!bond_has_slaves(bond))
2183                 goto re_arm;
2184
2185         /* check if agg_select_timer timer after initialize is timed out */
2186         if (BOND_AD_INFO(bond).agg_select_timer &&
2187             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2188                 slave = bond_first_slave_rcu(bond);
2189                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2190
2191                 /* select the active aggregator for the bond */
2192                 if (port) {
2193                         if (!port->slave) {
2194                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2195                                                      bond->dev->name);
2196                                 goto re_arm;
2197                         }
2198
2199                         aggregator = __get_first_agg(port);
2200                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2201                 }
2202                 bond_3ad_set_carrier(bond);
2203         }
2204
2205         /* for each port run the state machines */
2206         bond_for_each_slave_rcu(bond, slave, iter) {
2207                 port = &(SLAVE_AD_INFO(slave)->port);
2208                 if (!port->slave) {
2209                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2210                                             bond->dev->name);
2211                         goto re_arm;
2212                 }
2213
2214                 ad_rx_machine(NULL, port);
2215                 ad_periodic_machine(port);
2216                 ad_port_selection_logic(port, &update_slave_arr);
2217                 ad_mux_machine(port, &update_slave_arr);
2218                 ad_tx_machine(port);
2219                 ad_churn_machine(port);
2220
2221                 /* turn off the BEGIN bit, since we already handled it */
2222                 if (port->sm_vars & AD_PORT_BEGIN)
2223                         port->sm_vars &= ~AD_PORT_BEGIN;
2224         }
2225
2226 re_arm:
2227         bond_for_each_slave_rcu(bond, slave, iter) {
2228                 if (slave->should_notify) {
2229                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2230                         break;
2231                 }
2232         }
2233         rcu_read_unlock();
2234         spin_unlock_bh(&bond->mode_lock);
2235
2236         if (update_slave_arr)
2237                 bond_slave_arr_work_rearm(bond, 0);
2238
2239         if (should_notify_rtnl && rtnl_trylock()) {
2240                 bond_slave_state_notify(bond);
2241                 rtnl_unlock();
2242         }
2243         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2244 }
2245
2246 /**
2247  * bond_3ad_rx_indication - handle a received frame
2248  * @lacpdu: received lacpdu
2249  * @slave: slave struct to work on
2250  * @length: length of the data received
2251  *
2252  * It is assumed that frames that were sent on this NIC don't returned as new
2253  * received frames (loopback). Since only the payload is given to this
2254  * function, it check for loopback.
2255  */
2256 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2257                                   u16 length)
2258 {
2259         struct port *port;
2260         int ret = RX_HANDLER_ANOTHER;
2261
2262         if (length >= sizeof(struct lacpdu)) {
2263
2264                 port = &(SLAVE_AD_INFO(slave)->port);
2265
2266                 if (!port->slave) {
2267                         net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2268                                              slave->dev->name, slave->bond->dev->name);
2269                         return ret;
2270                 }
2271
2272                 switch (lacpdu->subtype) {
2273                 case AD_TYPE_LACPDU:
2274                         ret = RX_HANDLER_CONSUMED;
2275                         netdev_dbg(slave->bond->dev,
2276                                    "Received LACPDU on port %d slave %s\n",
2277                                    port->actor_port_number,
2278                                    slave->dev->name);
2279                         /* Protect against concurrent state machines */
2280                         spin_lock(&slave->bond->mode_lock);
2281                         ad_rx_machine(lacpdu, port);
2282                         spin_unlock(&slave->bond->mode_lock);
2283                         break;
2284
2285                 case AD_TYPE_MARKER:
2286                         ret = RX_HANDLER_CONSUMED;
2287                         /* No need to convert fields to Little Endian since we
2288                          * don't use the marker's fields.
2289                          */
2290
2291                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2292                         case AD_MARKER_INFORMATION_SUBTYPE:
2293                                 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2294                                            port->actor_port_number);
2295                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2296                                 break;
2297
2298                         case AD_MARKER_RESPONSE_SUBTYPE:
2299                                 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2300                                            port->actor_port_number);
2301                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2302                                 break;
2303
2304                         default:
2305                                 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2306                                            port->actor_port_number);
2307                         }
2308                 }
2309         }
2310         return ret;
2311 }
2312
2313 /**
2314  * ad_update_actor_keys - Update the oper / admin keys for a port based on
2315  * its current speed and duplex settings.
2316  *
2317  * @port: the port we'are looking at
2318  * @reset: Boolean to just reset the speed and the duplex part of the key
2319  *
2320  * The logic to change the oper / admin keys is:
2321  * (a) A full duplex port can participate in LACP with partner.
2322  * (b) When the speed is changed, LACP need to be reinitiated.
2323  */
2324 static void ad_update_actor_keys(struct port *port, bool reset)
2325 {
2326         u8 duplex = 0;
2327         u16 ospeed = 0, speed = 0;
2328         u16 old_oper_key = port->actor_oper_port_key;
2329
2330         port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2331         if (!reset) {
2332                 speed = __get_link_speed(port);
2333                 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2334                 duplex = __get_duplex(port);
2335                 port->actor_admin_port_key |= (speed << 1) | duplex;
2336         }
2337         port->actor_oper_port_key = port->actor_admin_port_key;
2338
2339         if (old_oper_key != port->actor_oper_port_key) {
2340                 /* Only 'duplex' port participates in LACP */
2341                 if (duplex)
2342                         port->sm_vars |= AD_PORT_LACP_ENABLED;
2343                 else
2344                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2345
2346                 if (!reset) {
2347                         if (!speed) {
2348                                 netdev_err(port->slave->dev,
2349                                            "speed changed to 0 for port %s",
2350                                            port->slave->dev->name);
2351                         } else if (duplex && ospeed != speed) {
2352                                 /* Speed change restarts LACP state-machine */
2353                                 port->sm_vars |= AD_PORT_BEGIN;
2354                         }
2355                 }
2356         }
2357 }
2358
2359 /**
2360  * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2361  * change indication
2362  *
2363  * @slave: slave struct to work on
2364  *
2365  * Handle reselection of aggregator (if needed) for this port.
2366  */
2367 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2368 {
2369         struct port *port;
2370
2371         port = &(SLAVE_AD_INFO(slave)->port);
2372
2373         /* if slave is null, the whole port is not initialized */
2374         if (!port->slave) {
2375                 netdev_warn(slave->bond->dev,
2376                             "speed/duplex changed for uninitialized port %s\n",
2377                             slave->dev->name);
2378                 return;
2379         }
2380
2381         spin_lock_bh(&slave->bond->mode_lock);
2382         ad_update_actor_keys(port, false);
2383         netdev_dbg(slave->bond->dev, "Port %d slave %s changed speed/duplex\n",
2384                    port->actor_port_number, slave->dev->name);
2385         spin_unlock_bh(&slave->bond->mode_lock);
2386 }
2387
2388 /**
2389  * bond_3ad_handle_link_change - handle a slave's link status change indication
2390  * @slave: slave struct to work on
2391  * @status: whether the link is now up or down
2392  *
2393  * Handle reselection of aggregator (if needed) for this port.
2394  */
2395 void bond_3ad_handle_link_change(struct slave *slave, char link)
2396 {
2397         struct port *port;
2398
2399         port = &(SLAVE_AD_INFO(slave)->port);
2400
2401         /* if slave is null, the whole port is not initialized */
2402         if (!port->slave) {
2403                 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2404                             slave->dev->name);
2405                 return;
2406         }
2407
2408         spin_lock_bh(&slave->bond->mode_lock);
2409         /* on link down we are zeroing duplex and speed since
2410          * some of the adaptors(ce1000.lan) report full duplex/speed
2411          * instead of N/A(duplex) / 0(speed).
2412          *
2413          * on link up we are forcing recheck on the duplex and speed since
2414          * some of he adaptors(ce1000.lan) report.
2415          */
2416         if (link == BOND_LINK_UP) {
2417                 port->is_enabled = true;
2418                 ad_update_actor_keys(port, false);
2419         } else {
2420                 /* link has failed */
2421                 port->is_enabled = false;
2422                 ad_update_actor_keys(port, true);
2423         }
2424         netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2425                    port->actor_port_number,
2426                    link == BOND_LINK_UP ? "UP" : "DOWN");
2427
2428         spin_unlock_bh(&slave->bond->mode_lock);
2429
2430         /* RTNL is held and mode_lock is released so it's safe
2431          * to update slave_array here.
2432          */
2433         bond_update_slave_arr(slave->bond, NULL);
2434 }
2435
2436 /**
2437  * bond_3ad_set_carrier - set link state for bonding master
2438  * @bond - bonding structure
2439  *
2440  * if we have an active aggregator, we're up, if not, we're down.
2441  * Presumes that we cannot have an active aggregator if there are
2442  * no slaves with link up.
2443  *
2444  * This behavior complies with IEEE 802.3 section 43.3.9.
2445  *
2446  * Called by bond_set_carrier(). Return zero if carrier state does not
2447  * change, nonzero if it does.
2448  */
2449 int bond_3ad_set_carrier(struct bonding *bond)
2450 {
2451         struct aggregator *active;
2452         struct slave *first_slave;
2453         int ret = 1;
2454
2455         rcu_read_lock();
2456         first_slave = bond_first_slave_rcu(bond);
2457         if (!first_slave) {
2458                 ret = 0;
2459                 goto out;
2460         }
2461         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2462         if (active) {
2463                 /* are enough slaves available to consider link up? */
2464                 if (active->num_of_ports < bond->params.min_links) {
2465                         if (netif_carrier_ok(bond->dev)) {
2466                                 netif_carrier_off(bond->dev);
2467                                 goto out;
2468                         }
2469                 } else if (!netif_carrier_ok(bond->dev)) {
2470                         netif_carrier_on(bond->dev);
2471                         goto out;
2472                 }
2473         } else if (netif_carrier_ok(bond->dev)) {
2474                 netif_carrier_off(bond->dev);
2475         }
2476 out:
2477         rcu_read_unlock();
2478         return ret;
2479 }
2480
2481 /**
2482  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2483  * @bond: bonding struct to work on
2484  * @ad_info: ad_info struct to fill with the bond's info
2485  *
2486  * Returns:   0 on success
2487  *          < 0 on error
2488  */
2489 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2490                                    struct ad_info *ad_info)
2491 {
2492         struct aggregator *aggregator = NULL;
2493         struct list_head *iter;
2494         struct slave *slave;
2495         struct port *port;
2496
2497         bond_for_each_slave_rcu(bond, slave, iter) {
2498                 port = &(SLAVE_AD_INFO(slave)->port);
2499                 if (port->aggregator && port->aggregator->is_active) {
2500                         aggregator = port->aggregator;
2501                         break;
2502                 }
2503         }
2504
2505         if (!aggregator)
2506                 return -1;
2507
2508         ad_info->aggregator_id = aggregator->aggregator_identifier;
2509         ad_info->ports = aggregator->num_of_ports;
2510         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2511         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2512         ether_addr_copy(ad_info->partner_system,
2513                         aggregator->partner_system.mac_addr_value);
2514         return 0;
2515 }
2516
2517 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2518 {
2519         int ret;
2520
2521         rcu_read_lock();
2522         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2523         rcu_read_unlock();
2524
2525         return ret;
2526 }
2527
2528 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2529                          struct slave *slave)
2530 {
2531         struct lacpdu *lacpdu, _lacpdu;
2532
2533         if (skb->protocol != PKT_TYPE_LACPDU)
2534                 return RX_HANDLER_ANOTHER;
2535
2536         if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2537                 return RX_HANDLER_ANOTHER;
2538
2539         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2540         if (!lacpdu)
2541                 return RX_HANDLER_ANOTHER;
2542
2543         return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2544 }
2545
2546 /**
2547  * bond_3ad_update_lacp_rate - change the lacp rate
2548  * @bond - bonding struct
2549  *
2550  * When modify lacp_rate parameter via sysfs,
2551  * update actor_oper_port_state of each port.
2552  *
2553  * Hold bond->mode_lock,
2554  * so we can modify port->actor_oper_port_state,
2555  * no matter bond is up or down.
2556  */
2557 void bond_3ad_update_lacp_rate(struct bonding *bond)
2558 {
2559         struct port *port = NULL;
2560         struct list_head *iter;
2561         struct slave *slave;
2562         int lacp_fast;
2563
2564         lacp_fast = bond->params.lacp_fast;
2565         spin_lock_bh(&bond->mode_lock);
2566         bond_for_each_slave(bond, slave, iter) {
2567                 port = &(SLAVE_AD_INFO(slave)->port);
2568                 if (lacp_fast)
2569                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2570                 else
2571                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2572         }
2573         spin_unlock_bh(&bond->mode_lock);
2574 }