drivers/net/bonding/bond_3ad.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   4  */
   5
   6 #include <linux/skbuff.h>
   7 #include <linux/if_ether.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/spinlock.h>
  10 #include <linux/ethtool.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/if_bonding.h>
  13 #include <linux/pkt_sched.h>
  14 #include <net/net_namespace.h>
  15 #include <net/bonding.h>
  16 #include <net/bond_3ad.h>
  17 #include <net/netlink.h>
  18
  19 /* General definitions */
  20 #define AD_SHORT_TIMEOUT           1
  21 #define AD_LONG_TIMEOUT            0
  22 #define AD_STANDBY                 0x2
  23 #define AD_MAX_TX_IN_SECOND        3
  24 #define AD_COLLECTOR_MAX_DELAY     0
  25
  26 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  27 #define AD_FAST_PERIODIC_TIME      1
  28 #define AD_SLOW_PERIODIC_TIME      30
  29 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  30 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  31 #define AD_CHURN_DETECTION_TIME    60
  32 #define AD_AGGREGATE_WAIT_TIME     2
  33
  34 /* Port Variables definitions used by the State Machines (43.4.7 in the
  35  * 802.3ad standard)
  36  */
  37 #define AD_PORT_BEGIN           0x1
  38 #define AD_PORT_LACP_ENABLED    0x2
  39 #define AD_PORT_ACTOR_CHURN     0x4
  40 #define AD_PORT_PARTNER_CHURN   0x8
  41 #define AD_PORT_READY           0x10
  42 #define AD_PORT_READY_N         0x20
  43 #define AD_PORT_MATCHED         0x40
  44 #define AD_PORT_STANDBY         0x80
  45 #define AD_PORT_SELECTED        0x100
  46 #define AD_PORT_MOVED           0x200
  47 #define AD_PORT_CHURNED         (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
  48
  49 /* Port Key definitions
  50  * key is determined according to the link speed, duplex and
  51  * user key (which is yet not supported)
  52  *           --------------------------------------------------------------
  53  * Port key  | User key (10 bits)           | Speed (5 bits)      | Duplex|
  54  *           --------------------------------------------------------------
  55  *           |15                           6|5                   1|0
  56  */
  57 #define  AD_DUPLEX_KEY_MASKS    0x1
  58 #define  AD_SPEED_KEY_MASKS     0x3E
  59 #define  AD_USER_KEY_MASKS      0xFFC0
  60
  61 enum ad_link_speed_type {
  62         AD_LINK_SPEED_1MBPS = 1,
  63         AD_LINK_SPEED_10MBPS,
  64         AD_LINK_SPEED_100MBPS,
  65         AD_LINK_SPEED_1000MBPS,
  66         AD_LINK_SPEED_2500MBPS,
  67         AD_LINK_SPEED_5000MBPS,
  68         AD_LINK_SPEED_10000MBPS,
  69         AD_LINK_SPEED_14000MBPS,
  70         AD_LINK_SPEED_20000MBPS,
  71         AD_LINK_SPEED_25000MBPS,
  72         AD_LINK_SPEED_40000MBPS,
  73         AD_LINK_SPEED_50000MBPS,
  74         AD_LINK_SPEED_56000MBPS,
  75         AD_LINK_SPEED_100000MBPS,
  76         AD_LINK_SPEED_200000MBPS,
  77         AD_LINK_SPEED_400000MBPS,
  78 };
  79
  80 /* compare MAC addresses */
  81 #define MAC_ADDRESS_EQUAL(A, B) \
  82         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
  83
  84 static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
  85         0, 0, 0, 0, 0, 0
  86 };
  87 static u16 ad_ticks_per_sec;
  88 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  89
  90 static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned =
  91         MULTICAST_LACPDU_ADDR;
  92
  93 /* ================= main 802.3ad protocol functions ================== */
  94 static int ad_lacpdu_send(struct port *port);
  95 static int ad_marker_send(struct port *port, struct bond_marker *marker);
  96 static void ad_mux_machine(struct port *port, bool *update_slave_arr);
  97 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
  98 static void ad_tx_machine(struct port *port);
  99 static void ad_periodic_machine(struct port *port);
 100 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
 101 static void ad_agg_selection_logic(struct aggregator *aggregator,
 102                                    bool *update_slave_arr);
 103 static void ad_clear_agg(struct aggregator *aggregator);
 104 static void ad_initialize_agg(struct aggregator *aggregator);
 105 static void ad_initialize_port(struct port *port, int lacp_fast);
 106 static void ad_enable_collecting_distributing(struct port *port,
 107                                               bool *update_slave_arr);
 108 static void ad_disable_collecting_distributing(struct port *port,
 109                                                bool *update_slave_arr);
 110 static void ad_marker_info_received(struct bond_marker *marker_info,
 111                                     struct port *port);
 112 static void ad_marker_response_received(struct bond_marker *marker,
 113                                         struct port *port);
 114 static void ad_update_actor_keys(struct port *port, bool reset);
 115
 116
 117 /* ================= api to bonding and kernel code ================== */
 118
 119 /**
 120  * __get_bond_by_port - get the port's bonding struct
 121  * @port: the port we're looking at
 122  *
 123  * Return @port's bonding struct, or %NULL if it can't be found.
 124  */
 125 static inline struct bonding *__get_bond_by_port(struct port *port)
 126 {
 127         if (port->slave == NULL)
 128                 return NULL;
 129
 130         return bond_get_bond_by_slave(port->slave);
 131 }
 132
 133 /**
 134  * __get_first_agg - get the first aggregator in the bond
 135  * @port: the port we're looking at
 136  *
 137  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 138  * found.
 139  * The caller must hold RCU or RTNL lock.
 140  */
 141 static inline struct aggregator *__get_first_agg(struct port *port)
 142 {
 143         struct bonding *bond = __get_bond_by_port(port);
 144         struct slave *first_slave;
 145         struct aggregator *agg;
 146
 147         /* If there's no bond for this port, or bond has no slaves */
 148         if (bond == NULL)
 149                 return NULL;
 150
 151         rcu_read_lock();
 152         first_slave = bond_first_slave_rcu(bond);
 153         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 154         rcu_read_unlock();
 155
 156         return agg;
 157 }
 158
 159 /**
 160  * __agg_has_partner - see if we have a partner
 161  * @agg: the agregator we're looking at
 162  *
 163  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 164  * address for the partner). Return 0 if not.
 165  */
 166 static inline int __agg_has_partner(struct aggregator *agg)
 167 {
 168         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 169 }
 170
 171 /**
 172  * __disable_port - disable the port's slave
 173  * @port: the port we're looking at
 174  */
 175 static inline void __disable_port(struct port *port)
 176 {
 177         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 178 }
 179
 180 /**
 181  * __enable_port - enable the port's slave, if it's up
 182  * @port: the port we're looking at
 183  */
 184 static inline void __enable_port(struct port *port)
 185 {
 186         struct slave *slave = port->slave;
 187
 188         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 189                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 190 }
 191
 192 /**
 193  * __port_is_enabled - check if the port's slave is in active state
 194  * @port: the port we're looking at
 195  */
 196 static inline int __port_is_enabled(struct port *port)
 197 {
 198         return bond_is_active_slave(port->slave);
 199 }
 200
 201 /**
 202  * __get_agg_selection_mode - get the aggregator selection mode
 203  * @port: the port we're looking at
 204  *
 205  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 206  */
 207 static inline u32 __get_agg_selection_mode(struct port *port)
 208 {
 209         struct bonding *bond = __get_bond_by_port(port);
 210
 211         if (bond == NULL)
 212                 return BOND_AD_STABLE;
 213
 214         return bond->params.ad_select;
 215 }
 216
 217 /**
 218  * __check_agg_selection_timer - check if the selection timer has expired
 219  * @port: the port we're looking at
 220  */
 221 static inline int __check_agg_selection_timer(struct port *port)
 222 {
 223         struct bonding *bond = __get_bond_by_port(port);
 224
 225         if (bond == NULL)
 226                 return 0;
 227
 228         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 229 }
 230
 231 /**
 232  * __get_link_speed - get a port's speed
 233  * @port: the port we're looking at
 234  *
 235  * Return @port's speed in 802.3ad enum format. i.e. one of:
 236  *     0,
 237  *     %AD_LINK_SPEED_10MBPS,
 238  *     %AD_LINK_SPEED_100MBPS,
 239  *     %AD_LINK_SPEED_1000MBPS,
 240  *     %AD_LINK_SPEED_2500MBPS,
 241  *     %AD_LINK_SPEED_5000MBPS,
 242  *     %AD_LINK_SPEED_10000MBPS
 243  *     %AD_LINK_SPEED_14000MBPS,
 244  *     %AD_LINK_SPEED_20000MBPS
 245  *     %AD_LINK_SPEED_25000MBPS
 246  *     %AD_LINK_SPEED_40000MBPS
 247  *     %AD_LINK_SPEED_50000MBPS
 248  *     %AD_LINK_SPEED_56000MBPS
 249  *     %AD_LINK_SPEED_100000MBPS
 250  *     %AD_LINK_SPEED_200000MBPS
 251  *     %AD_LINK_SPEED_400000MBPS
 252  */
 253 static u16 __get_link_speed(struct port *port)
 254 {
 255         struct slave *slave = port->slave;
 256         u16 speed;
 257
 258         /* this if covers only a special case: when the configuration starts
 259          * with link down, it sets the speed to 0.
 260          * This is done in spite of the fact that the e100 driver reports 0
 261          * to be compatible with MVT in the future.
 262          */
 263         if (slave->link != BOND_LINK_UP)
 264                 speed = 0;
 265         else {
 266                 switch (slave->speed) {
 267                 case SPEED_10:
 268                         speed = AD_LINK_SPEED_10MBPS;
 269                         break;
 270
 271                 case SPEED_100:
 272                         speed = AD_LINK_SPEED_100MBPS;
 273                         break;
 274
 275                 case SPEED_1000:
 276                         speed = AD_LINK_SPEED_1000MBPS;
 277                         break;
 278
 279                 case SPEED_2500:
 280                         speed = AD_LINK_SPEED_2500MBPS;
 281                         break;
 282
 283                 case SPEED_5000:
 284                         speed = AD_LINK_SPEED_5000MBPS;
 285                         break;
 286
 287                 case SPEED_10000:
 288                         speed = AD_LINK_SPEED_10000MBPS;
 289                         break;
 290
 291                 case SPEED_14000:
 292                         speed = AD_LINK_SPEED_14000MBPS;
 293                         break;
 294
 295                 case SPEED_20000:
 296                         speed = AD_LINK_SPEED_20000MBPS;
 297                         break;
 298
 299                 case SPEED_25000:
 300                         speed = AD_LINK_SPEED_25000MBPS;
 301                         break;
 302
 303                 case SPEED_40000:
 304                         speed = AD_LINK_SPEED_40000MBPS;
 305                         break;
 306
 307                 case SPEED_50000:
 308                         speed = AD_LINK_SPEED_50000MBPS;
 309                         break;
 310
 311                 case SPEED_56000:
 312                         speed = AD_LINK_SPEED_56000MBPS;
 313                         break;
 314
 315                 case SPEED_100000:
 316                         speed = AD_LINK_SPEED_100000MBPS;
 317                         break;
 318
 319                 case SPEED_200000:
 320                         speed = AD_LINK_SPEED_200000MBPS;
 321                         break;
 322
 323                 case SPEED_400000:
 324                         speed = AD_LINK_SPEED_400000MBPS;
 325                         break;
 326
 327                 default:
 328                         /* unknown speed value from ethtool. shouldn't happen */
 329                         if (slave->speed != SPEED_UNKNOWN)
 330                                 pr_err_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n",
 331                                             slave->bond->dev->name,
 332                                             slave->dev->name, slave->speed,
 333                                             port->actor_port_number);
 334                         speed = 0;
 335                         break;
 336                 }
 337         }
 338
 339         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n",
 340                   port->actor_port_number, speed);
 341         return speed;
 342 }
 343
 344 /**
 345  * __get_duplex - get a port's duplex
 346  * @port: the port we're looking at
 347  *
 348  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 349  *     0x01 if in full duplex
 350  *     0x00 otherwise
 351  */
 352 static u8 __get_duplex(struct port *port)
 353 {
 354         struct slave *slave = port->slave;
 355         u8 retval = 0x0;
 356
 357         /* handling a special case: when the configuration starts with
 358          * link down, it sets the duplex to 0.
 359          */
 360         if (slave->link == BOND_LINK_UP) {
 361                 switch (slave->duplex) {
 362                 case DUPLEX_FULL:
 363                         retval = 0x1;
 364                         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n",
 365                                   port->actor_port_number);
 366                         break;
 367                 case DUPLEX_HALF:
 368                 default:
 369                         retval = 0x0;
 370                         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n",
 371                                   port->actor_port_number);
 372                         break;
 373                 }
 374         }
 375         return retval;
 376 }
 377
 378 static void __ad_actor_update_port(struct port *port)
 379 {
 380         const struct bonding *bond = bond_get_bond_by_slave(port->slave);
 381
 382         port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
 383         port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
 384 }
 385
 386 /* Conversions */
 387
 388 /**
 389  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 390  * @timer_type: which timer to operate
 391  * @par: timer parameter. see below
 392  *
 393  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 394  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 395  *                                                   %SLOW_PERIODIC_TIME.
 396  */
 397 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 398 {
 399         u16 retval = 0; /* to silence the compiler */
 400
 401         switch (timer_type) {
 402         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 403                 if (par)
 404                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 405                 else
 406                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 407                 break;
 408         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 409                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 410                 break;
 411         case AD_PERIODIC_TIMER:         /* for periodic machine */
 412                 retval = (par*ad_ticks_per_sec); /* long timeout */
 413                 break;
 414         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 415                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 416                 break;
 417         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 418                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 419                 break;
 420         }
 421
 422         return retval;
 423 }
 424
 425
 426 /* ================= ad_rx_machine helper functions ================== */
 427
 428 /**
 429  * __choose_matched - update a port's matched variable from a received lacpdu
 430  * @lacpdu: the lacpdu we've received
 431  * @port: the port we're looking at
 432  *
 433  * Update the value of the matched variable, using parameter values from a
 434  * newly received lacpdu. Parameter values for the partner carried in the
 435  * received PDU are compared with the corresponding operational parameter
 436  * values for the actor. Matched is set to TRUE if all of these parameters
 437  * match and the PDU parameter partner_state.aggregation has the same value as
 438  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 439  * in the aggregation. Matched is also set to TRUE if the value of
 440  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 441  * an individual link and lacp will actively maintain the link. Otherwise,
 442  * matched is set to FALSE. LACP is considered to be actively maintaining the
 443  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 444  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 445  * partner_state.lacp_activity variables are TRUE.
 446  *
 447  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 448  * used here to implement the language from 802.3ad 43.4.9 that requires
 449  * recordPDU to "match" the LACPDU parameters to the stored values.
 450  */
 451 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 452 {
 453         /* check if all parameters are alike
 454          * or this is individual link(aggregation == FALSE)
 455          * then update the state machine Matched variable.
 456          */
 457         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 458              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 459              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 460              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 461              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 462              ((lacpdu->partner_state & LACP_STATE_AGGREGATION) == (port->actor_oper_port_state & LACP_STATE_AGGREGATION))) ||
 463             ((lacpdu->actor_state & LACP_STATE_AGGREGATION) == 0)
 464                 ) {
 465                 port->sm_vars |= AD_PORT_MATCHED;
 466         } else {
 467                 port->sm_vars &= ~AD_PORT_MATCHED;
 468         }
 469 }
 470
 471 /**
 472  * __record_pdu - record parameters from a received lacpdu
 473  * @lacpdu: the lacpdu we've received
 474  * @port: the port we're looking at
 475  *
 476  * Record the parameter values for the Actor carried in a received lacpdu as
 477  * the current partner operational parameter values and sets
 478  * actor_oper_port_state.defaulted to FALSE.
 479  */
 480 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 481 {
 482         if (lacpdu && port) {
 483                 struct port_params *partner = &port->partner_oper;
 484
 485                 __choose_matched(lacpdu, port);
 486                 /* record the new parameter values for the partner
 487                  * operational
 488                  */
 489                 partner->port_number = ntohs(lacpdu->actor_port);
 490                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 491                 partner->system = lacpdu->actor_system;
 492                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 493                 partner->key = ntohs(lacpdu->actor_key);
 494                 partner->port_state = lacpdu->actor_state;
 495
 496                 /* set actor_oper_port_state.defaulted to FALSE */
 497                 port->actor_oper_port_state &= ~LACP_STATE_DEFAULTED;
 498
 499                 /* set the partner sync. to on if the partner is sync,
 500                  * and the port is matched
 501                  */
 502                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 503                     (lacpdu->actor_state & LACP_STATE_SYNCHRONIZATION)) {
 504                         partner->port_state |= LACP_STATE_SYNCHRONIZATION;
 505                         slave_dbg(port->slave->bond->dev, port->slave->dev,
 506                                   "partner sync=1\n");
 507                 } else {
 508                         partner->port_state &= ~LACP_STATE_SYNCHRONIZATION;
 509                         slave_dbg(port->slave->bond->dev, port->slave->dev,
 510                                   "partner sync=0\n");
 511                 }
 512         }
 513 }
 514
 515 /**
 516  * __record_default - record default parameters
 517  * @port: the port we're looking at
 518  *
 519  * This function records the default parameter values for the partner carried
 520  * in the Partner Admin parameters as the current partner operational parameter
 521  * values and sets actor_oper_port_state.defaulted to TRUE.
 522  */
 523 static void __record_default(struct port *port)
 524 {
 525         if (port) {
 526                 /* record the partner admin parameters */
 527                 memcpy(&port->partner_oper, &port->partner_admin,
 528                        sizeof(struct port_params));
 529
 530                 /* set actor_oper_port_state.defaulted to true */
 531                 port->actor_oper_port_state |= LACP_STATE_DEFAULTED;
 532         }
 533 }
 534
 535 /**
 536  * __update_selected - update a port's Selected variable from a received lacpdu
 537  * @lacpdu: the lacpdu we've received
 538  * @port: the port we're looking at
 539  *
 540  * Update the value of the selected variable, using parameter values from a
 541  * newly received lacpdu. The parameter values for the Actor carried in the
 542  * received PDU are compared with the corresponding operational parameter
 543  * values for the ports partner. If one or more of the comparisons shows that
 544  * the value(s) received in the PDU differ from the current operational values,
 545  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 546  * set to out_of_sync. Otherwise, selected remains unchanged.
 547  */
 548 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 549 {
 550         if (lacpdu && port) {
 551                 const struct port_params *partner = &port->partner_oper;
 552
 553                 /* check if any parameter is different then
 554                  * update the state machine selected variable.
 555                  */
 556                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 557                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 558                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 559                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 560                     ntohs(lacpdu->actor_key) != partner->key ||
 561                     (lacpdu->actor_state & LACP_STATE_AGGREGATION) != (partner->port_state & LACP_STATE_AGGREGATION)) {
 562                         port->sm_vars &= ~AD_PORT_SELECTED;
 563                 }
 564         }
 565 }
 566
 567 /**
 568  * __update_default_selected - update a port's Selected variable from Partner
 569  * @port: the port we're looking at
 570  *
 571  * This function updates the value of the selected variable, using the partner
 572  * administrative parameter values. The administrative values are compared with
 573  * the corresponding operational parameter values for the partner. If one or
 574  * more of the comparisons shows that the administrative value(s) differ from
 575  * the current operational values, then Selected is set to FALSE and
 576  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 577  * Selected remains unchanged.
 578  */
 579 static void __update_default_selected(struct port *port)
 580 {
 581         if (port) {
 582                 const struct port_params *admin = &port->partner_admin;
 583                 const struct port_params *oper = &port->partner_oper;
 584
 585                 /* check if any parameter is different then
 586                  * update the state machine selected variable.
 587                  */
 588                 if (admin->port_number != oper->port_number ||
 589                     admin->port_priority != oper->port_priority ||
 590                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 591                     admin->system_priority != oper->system_priority ||
 592                     admin->key != oper->key ||
 593                     (admin->port_state & LACP_STATE_AGGREGATION)
 594                         != (oper->port_state & LACP_STATE_AGGREGATION)) {
 595                         port->sm_vars &= ~AD_PORT_SELECTED;
 596                 }
 597         }
 598 }
 599
 600 /**
 601  * __update_ntt - update a port's ntt variable from a received lacpdu
 602  * @lacpdu: the lacpdu we've received
 603  * @port: the port we're looking at
 604  *
 605  * Updates the value of the ntt variable, using parameter values from a newly
 606  * received lacpdu. The parameter values for the partner carried in the
 607  * received PDU are compared with the corresponding operational parameter
 608  * values for the Actor. If one or more of the comparisons shows that the
 609  * value(s) received in the PDU differ from the current operational values,
 610  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 611  */
 612 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 613 {
 614         /* validate lacpdu and port */
 615         if (lacpdu && port) {
 616                 /* check if any parameter is different then
 617                  * update the port->ntt.
 618                  */
 619                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 620                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 621                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 622                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 623                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 624                     ((lacpdu->partner_state & LACP_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY)) ||
 625                     ((lacpdu->partner_state & LACP_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT)) ||
 626                     ((lacpdu->partner_state & LACP_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) ||
 627                     ((lacpdu->partner_state & LACP_STATE_AGGREGATION) != (port->actor_oper_port_state & LACP_STATE_AGGREGATION))
 628                    ) {
 629                         port->ntt = true;
 630                 }
 631         }
 632 }
 633
 634 /**
 635  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 636  * @aggregator: the aggregator we're looking at
 637  *
 638  */
 639 static int __agg_ports_are_ready(struct aggregator *aggregator)
 640 {
 641         struct port *port;
 642         int retval = 1;
 643
 644         if (aggregator) {
 645                 /* scan all ports in this aggregator to verfy if they are
 646                  * all ready.
 647                  */
 648                 for (port = aggregator->lag_ports;
 649                      port;
 650                      port = port->next_port_in_aggregator) {
 651                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 652                                 retval = 0;
 653                                 break;
 654                         }
 655                 }
 656         }
 657
 658         return retval;
 659 }
 660
 661 /**
 662  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 663  * @aggregator: the aggregator we're looking at
 664  * @val: Should the ports' ready bit be set on or off
 665  *
 666  */
 667 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 668 {
 669         struct port *port;
 670
 671         for (port = aggregator->lag_ports; port;
 672              port = port->next_port_in_aggregator) {
 673                 if (val)
 674                         port->sm_vars |= AD_PORT_READY;
 675                 else
 676                         port->sm_vars &= ~AD_PORT_READY;
 677         }
 678 }
 679
 680 static int __agg_active_ports(struct aggregator *agg)
 681 {
 682         struct port *port;
 683         int active = 0;
 684
 685         for (port = agg->lag_ports; port;
 686              port = port->next_port_in_aggregator) {
 687                 if (port->is_enabled)
 688                         active++;
 689         }
 690
 691         return active;
 692 }
 693
 694 /**
 695  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 696  * @aggregator: the aggregator we're looking at
 697  *
 698  */
 699 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 700 {
 701         int nports = __agg_active_ports(aggregator);
 702         u32 bandwidth = 0;
 703
 704         if (nports) {
 705                 switch (__get_link_speed(aggregator->lag_ports)) {
 706                 case AD_LINK_SPEED_1MBPS:
 707                         bandwidth = nports;
 708                         break;
 709                 case AD_LINK_SPEED_10MBPS:
 710                         bandwidth = nports * 10;
 711                         break;
 712                 case AD_LINK_SPEED_100MBPS:
 713                         bandwidth = nports * 100;
 714                         break;
 715                 case AD_LINK_SPEED_1000MBPS:
 716                         bandwidth = nports * 1000;
 717                         break;
 718                 case AD_LINK_SPEED_2500MBPS:
 719                         bandwidth = nports * 2500;
 720                         break;
 721                 case AD_LINK_SPEED_5000MBPS:
 722                         bandwidth = nports * 5000;
 723                         break;
 724                 case AD_LINK_SPEED_10000MBPS:
 725                         bandwidth = nports * 10000;
 726                         break;
 727                 case AD_LINK_SPEED_14000MBPS:
 728                         bandwidth = nports * 14000;
 729                         break;
 730                 case AD_LINK_SPEED_20000MBPS:
 731                         bandwidth = nports * 20000;
 732                         break;
 733                 case AD_LINK_SPEED_25000MBPS:
 734                         bandwidth = nports * 25000;
 735                         break;
 736                 case AD_LINK_SPEED_40000MBPS:
 737                         bandwidth = nports * 40000;
 738                         break;
 739                 case AD_LINK_SPEED_50000MBPS:
 740                         bandwidth = nports * 50000;
 741                         break;
 742                 case AD_LINK_SPEED_56000MBPS:
 743                         bandwidth = nports * 56000;
 744                         break;
 745                 case AD_LINK_SPEED_100000MBPS:
 746                         bandwidth = nports * 100000;
 747                         break;
 748                 case AD_LINK_SPEED_200000MBPS:
 749                         bandwidth = nports * 200000;
 750                         break;
 751                 case AD_LINK_SPEED_400000MBPS:
 752                         bandwidth = nports * 400000;
 753                         break;
 754                 default:
 755                         bandwidth = 0; /* to silence the compiler */
 756                 }
 757         }
 758         return bandwidth;
 759 }
 760
 761 /**
 762  * __get_active_agg - get the current active aggregator
 763  * @aggregator: the aggregator we're looking at
 764  *
 765  * Caller must hold RCU lock.
 766  */
 767 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 768 {
 769         struct bonding *bond = aggregator->slave->bond;
 770         struct list_head *iter;
 771         struct slave *slave;
 772
 773         bond_for_each_slave_rcu(bond, slave, iter)
 774                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 775                         return &(SLAVE_AD_INFO(slave)->aggregator);
 776
 777         return NULL;
 778 }
 779
 780 /**
 781  * __update_lacpdu_from_port - update a port's lacpdu fields
 782  * @port: the port we're looking at
 783  */
 784 static inline void __update_lacpdu_from_port(struct port *port)
 785 {
 786         struct lacpdu *lacpdu = &port->lacpdu;
 787         const struct port_params *partner = &port->partner_oper;
 788
 789         /* update current actual Actor parameters
 790          * lacpdu->subtype                   initialized
 791          * lacpdu->version_number            initialized
 792          * lacpdu->tlv_type_actor_info       initialized
 793          * lacpdu->actor_information_length  initialized
 794          */
 795
 796         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 797         lacpdu->actor_system = port->actor_system;
 798         lacpdu->actor_key = htons(port->actor_oper_port_key);
 799         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 800         lacpdu->actor_port = htons(port->actor_port_number);
 801         lacpdu->actor_state = port->actor_oper_port_state;
 802         slave_dbg(port->slave->bond->dev, port->slave->dev,
 803                   "update lacpdu: actor port state %x\n",
 804                   port->actor_oper_port_state);
 805
 806         /* lacpdu->reserved_3_1              initialized
 807          * lacpdu->tlv_type_partner_info     initialized
 808          * lacpdu->partner_information_length initialized
 809          */
 810
 811         lacpdu->partner_system_priority = htons(partner->system_priority);
 812         lacpdu->partner_system = partner->system;
 813         lacpdu->partner_key = htons(partner->key);
 814         lacpdu->partner_port_priority = htons(partner->port_priority);
 815         lacpdu->partner_port = htons(partner->port_number);
 816         lacpdu->partner_state = partner->port_state;
 817
 818         /* lacpdu->reserved_3_2              initialized
 819          * lacpdu->tlv_type_collector_info   initialized
 820          * lacpdu->collector_information_length initialized
 821          * collector_max_delay                initialized
 822          * reserved_12[12]                   initialized
 823          * tlv_type_terminator               initialized
 824          * terminator_length                 initialized
 825          * reserved_50[50]                   initialized
 826          */
 827 }
 828
 829 /* ================= main 802.3ad protocol code ========================= */
 830
 831 /**
 832  * ad_lacpdu_send - send out a lacpdu packet on a given port
 833  * @port: the port we're looking at
 834  *
 835  * Returns:   0 on success
 836  *          < 0 on error
 837  */
 838 static int ad_lacpdu_send(struct port *port)
 839 {
 840         struct slave *slave = port->slave;
 841         struct sk_buff *skb;
 842         struct lacpdu_header *lacpdu_header;
 843         int length = sizeof(struct lacpdu_header);
 844
 845         skb = dev_alloc_skb(length);
 846         if (!skb)
 847                 return -ENOMEM;
 848
 849         atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx);
 850         atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx);
 851
 852         skb->dev = slave->dev;
 853         skb_reset_mac_header(skb);
 854         skb->network_header = skb->mac_header + ETH_HLEN;
 855         skb->protocol = PKT_TYPE_LACPDU;
 856         skb->priority = TC_PRIO_CONTROL;
 857
 858         lacpdu_header = skb_put(skb, length);
 859
 860         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 861         /* Note: source address is set to be the member's PERMANENT address,
 862          * because we use it to identify loopback lacpdus in receive.
 863          */
 864         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 865         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 866
 867         lacpdu_header->lacpdu = port->lacpdu;
 868
 869         dev_queue_xmit(skb);
 870
 871         return 0;
 872 }
 873
 874 /**
 875  * ad_marker_send - send marker information/response on a given port
 876  * @port: the port we're looking at
 877  * @marker: marker data to send
 878  *
 879  * Returns:   0 on success
 880  *          < 0 on error
 881  */
 882 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 883 {
 884         struct slave *slave = port->slave;
 885         struct sk_buff *skb;
 886         struct bond_marker_header *marker_header;
 887         int length = sizeof(struct bond_marker_header);
 888
 889         skb = dev_alloc_skb(length + 16);
 890         if (!skb)
 891                 return -ENOMEM;
 892
 893         switch (marker->tlv_type) {
 894         case AD_MARKER_INFORMATION_SUBTYPE:
 895                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx);
 896                 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx);
 897                 break;
 898         case AD_MARKER_RESPONSE_SUBTYPE:
 899                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx);
 900                 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx);
 901                 break;
 902         }
 903
 904         skb_reserve(skb, 16);
 905
 906         skb->dev = slave->dev;
 907         skb_reset_mac_header(skb);
 908         skb->network_header = skb->mac_header + ETH_HLEN;
 909         skb->protocol = PKT_TYPE_LACPDU;
 910
 911         marker_header = skb_put(skb, length);
 912
 913         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 914         /* Note: source address is set to be the member's PERMANENT address,
 915          * because we use it to identify loopback MARKERs in receive.
 916          */
 917         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 918         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 919
 920         marker_header->marker = *marker;
 921
 922         dev_queue_xmit(skb);
 923
 924         return 0;
 925 }
 926
 927 /**
 928  * ad_mux_machine - handle a port's mux state machine
 929  * @port: the port we're looking at
 930  * @update_slave_arr: Does slave array need update?
 931  */
 932 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 933 {
 934         mux_states_t last_state;
 935
 936         /* keep current State Machine state to compare later if it was
 937          * changed
 938          */
 939         last_state = port->sm_mux_state;
 940
 941         if (port->sm_vars & AD_PORT_BEGIN) {
 942                 port->sm_mux_state = AD_MUX_DETACHED;
 943         } else {
 944                 switch (port->sm_mux_state) {
 945                 case AD_MUX_DETACHED:
 946                         if ((port->sm_vars & AD_PORT_SELECTED)
 947                             || (port->sm_vars & AD_PORT_STANDBY))
 948                                 /* if SELECTED or STANDBY */
 949                                 port->sm_mux_state = AD_MUX_WAITING;
 950                         break;
 951                 case AD_MUX_WAITING:
 952                         /* if SELECTED == FALSE return to DETACH state */
 953                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 954                                 port->sm_vars &= ~AD_PORT_READY_N;
 955                                 /* in order to withhold the Selection Logic to
 956                                  * check all ports READY_N value every callback
 957                                  * cycle to update ready variable, we check
 958                                  * READY_N and update READY here
 959                                  */
 960                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 961                                 port->sm_mux_state = AD_MUX_DETACHED;
 962                                 break;
 963                         }
 964
 965                         /* check if the wait_while_timer expired */
 966                         if (port->sm_mux_timer_counter
 967                             && !(--port->sm_mux_timer_counter))
 968                                 port->sm_vars |= AD_PORT_READY_N;
 969
 970                         /* in order to withhold the selection logic to check
 971                          * all ports READY_N value every callback cycle to
 972                          * update ready variable, we check READY_N and update
 973                          * READY here
 974                          */
 975                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 976
 977                         /* if the wait_while_timer expired, and the port is
 978                          * in READY state, move to ATTACHED state
 979                          */
 980                         if ((port->sm_vars & AD_PORT_READY)
 981                             && !port->sm_mux_timer_counter)
 982                                 port->sm_mux_state = AD_MUX_ATTACHED;
 983                         break;
 984                 case AD_MUX_ATTACHED:
 985                         /* check also if agg_select_timer expired (so the
 986                          * edable port will take place only after this timer)
 987                          */
 988                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 989                             (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) &&
 990                             !__check_agg_selection_timer(port)) {
 991                                 if (port->aggregator->is_active)
 992                                         port->sm_mux_state =
 993                                             AD_MUX_COLLECTING_DISTRIBUTING;
 994                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 995                                    (port->sm_vars & AD_PORT_STANDBY)) {
 996                                 /* if UNSELECTED or STANDBY */
 997                                 port->sm_vars &= ~AD_PORT_READY_N;
 998                                 /* in order to withhold the selection logic to
 999                                  * check all ports READY_N value every callback
1000                                  * cycle to update ready variable, we check
1001                                  * READY_N and update READY here
1002                                  */
1003                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1004                                 port->sm_mux_state = AD_MUX_DETACHED;
1005                         } else if (port->aggregator->is_active) {
1006                                 port->actor_oper_port_state |=
1007                                     LACP_STATE_SYNCHRONIZATION;
1008                         }
1009                         break;
1010                 case AD_MUX_COLLECTING_DISTRIBUTING:
1011                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
1012                             (port->sm_vars & AD_PORT_STANDBY) ||
1013                             !(port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) ||
1014                             !(port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION)) {
1015                                 port->sm_mux_state = AD_MUX_ATTACHED;
1016                         } else {
1017                                 /* if port state hasn't changed make
1018                                  * sure that a collecting distributing
1019                                  * port in an active aggregator is enabled
1020                                  */
1021                                 if (port->aggregator &&
1022                                     port->aggregator->is_active &&
1023                                     !__port_is_enabled(port)) {
1024
1025                                         __enable_port(port);
1026                                 }
1027                         }
1028                         break;
1029                 default:
1030                         break;
1031                 }
1032         }
1033
1034         /* check if the state machine was changed */
1035         if (port->sm_mux_state != last_state) {
1036                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1037                           "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
1038                           port->actor_port_number,
1039                           last_state,
1040                           port->sm_mux_state);
1041                 switch (port->sm_mux_state) {
1042                 case AD_MUX_DETACHED:
1043                         port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1044                         ad_disable_collecting_distributing(port,
1045                                                            update_slave_arr);
1046                         port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1047                         port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1048                         port->ntt = true;
1049                         break;
1050                 case AD_MUX_WAITING:
1051                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1052                         break;
1053                 case AD_MUX_ATTACHED:
1054                         if (port->aggregator->is_active)
1055                                 port->actor_oper_port_state |=
1056                                     LACP_STATE_SYNCHRONIZATION;
1057                         else
1058                                 port->actor_oper_port_state &=
1059                                     ~LACP_STATE_SYNCHRONIZATION;
1060                         port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
1061                         port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
1062                         ad_disable_collecting_distributing(port,
1063                                                            update_slave_arr);
1064                         port->ntt = true;
1065                         break;
1066                 case AD_MUX_COLLECTING_DISTRIBUTING:
1067                         port->actor_oper_port_state |= LACP_STATE_COLLECTING;
1068                         port->actor_oper_port_state |= LACP_STATE_DISTRIBUTING;
1069                         port->actor_oper_port_state |= LACP_STATE_SYNCHRONIZATION;
1070                         ad_enable_collecting_distributing(port,
1071                                                           update_slave_arr);
1072                         port->ntt = true;
1073                         break;
1074                 default:
1075                         break;
1076                 }
1077         }
1078 }
1079
1080 /**
1081  * ad_rx_machine - handle a port's rx State Machine
1082  * @lacpdu: the lacpdu we've received
1083  * @port: the port we're looking at
1084  *
1085  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1086  * CURRENT. If timer expired set the state machine in the proper state.
1087  * In other cases, this function checks if we need to switch to other state.
1088  */
1089 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1090 {
1091         rx_states_t last_state;
1092
1093         /* keep current State Machine state to compare later if it was
1094          * changed
1095          */
1096         last_state = port->sm_rx_state;
1097
1098         if (lacpdu) {
1099                 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx);
1100                 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx);
1101         }
1102         /* check if state machine should change state */
1103
1104         /* first, check if port was reinitialized */
1105         if (port->sm_vars & AD_PORT_BEGIN) {
1106                 port->sm_rx_state = AD_RX_INITIALIZE;
1107                 port->sm_vars |= AD_PORT_CHURNED;
1108         /* check if port is not enabled */
1109         } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1110                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1111         /* check if new lacpdu arrived */
1112         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1113                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1114                  (port->sm_rx_state == AD_RX_CURRENT))) {
1115                 if (port->sm_rx_state != AD_RX_CURRENT)
1116                         port->sm_vars |= AD_PORT_CHURNED;
1117                 port->sm_rx_timer_counter = 0;
1118                 port->sm_rx_state = AD_RX_CURRENT;
1119         } else {
1120                 /* if timer is on, and if it is expired */
1121                 if (port->sm_rx_timer_counter &&
1122                     !(--port->sm_rx_timer_counter)) {
1123                         switch (port->sm_rx_state) {
1124                         case AD_RX_EXPIRED:
1125                                 port->sm_rx_state = AD_RX_DEFAULTED;
1126                                 break;
1127                         case AD_RX_CURRENT:
1128                                 port->sm_rx_state = AD_RX_EXPIRED;
1129                                 break;
1130                         default:
1131                                 break;
1132                         }
1133                 } else {
1134                         /* if no lacpdu arrived and no timer is on */
1135                         switch (port->sm_rx_state) {
1136                         case AD_RX_PORT_DISABLED:
1137                                 if (port->is_enabled &&
1138                                     (port->sm_vars & AD_PORT_LACP_ENABLED))
1139                                         port->sm_rx_state = AD_RX_EXPIRED;
1140                                 else if (port->is_enabled
1141                                          && ((port->sm_vars
1142                                               & AD_PORT_LACP_ENABLED) == 0))
1143                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1144                                 break;
1145                         default:
1146                                 break;
1147
1148                         }
1149                 }
1150         }
1151
1152         /* check if the State machine was changed or new lacpdu arrived */
1153         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1154                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1155                           "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1156                           port->actor_port_number,
1157                           last_state,
1158                           port->sm_rx_state);
1159                 switch (port->sm_rx_state) {
1160                 case AD_RX_INITIALIZE:
1161                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1162                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1163                         else
1164                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1165                         port->sm_vars &= ~AD_PORT_SELECTED;
1166                         __record_default(port);
1167                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1168                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1169
1170                         fallthrough;
1171                 case AD_RX_PORT_DISABLED:
1172                         port->sm_vars &= ~AD_PORT_MATCHED;
1173                         break;
1174                 case AD_RX_LACP_DISABLED:
1175                         port->sm_vars &= ~AD_PORT_SELECTED;
1176                         __record_default(port);
1177                         port->partner_oper.port_state &= ~LACP_STATE_AGGREGATION;
1178                         port->sm_vars |= AD_PORT_MATCHED;
1179                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1180                         break;
1181                 case AD_RX_EXPIRED:
1182                         /* Reset of the Synchronization flag (Standard 43.4.12)
1183                          * This reset cause to disable this port in the
1184                          * COLLECTING_DISTRIBUTING state of the mux machine in
1185                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1186                          * the port.
1187                          */
1188                         port->partner_oper.port_state &= ~LACP_STATE_SYNCHRONIZATION;
1189                         port->sm_vars &= ~AD_PORT_MATCHED;
1190                         port->partner_oper.port_state |= LACP_STATE_LACP_TIMEOUT;
1191                         port->partner_oper.port_state |= LACP_STATE_LACP_ACTIVITY;
1192                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1193                         port->actor_oper_port_state |= LACP_STATE_EXPIRED;
1194                         port->sm_vars |= AD_PORT_CHURNED;
1195                         break;
1196                 case AD_RX_DEFAULTED:
1197                         __update_default_selected(port);
1198                         __record_default(port);
1199                         port->sm_vars |= AD_PORT_MATCHED;
1200                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1201                         break;
1202                 case AD_RX_CURRENT:
1203                         /* detect loopback situation */
1204                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1205                                               &(port->actor_system))) {
1206                                 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n"
1207                                           "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n");
1208                                 return;
1209                         }
1210                         __update_selected(lacpdu, port);
1211                         __update_ntt(lacpdu, port);
1212                         __record_pdu(lacpdu, port);
1213                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & LACP_STATE_LACP_TIMEOUT));
1214                         port->actor_oper_port_state &= ~LACP_STATE_EXPIRED;
1215                         break;
1216                 default:
1217                         break;
1218                 }
1219         }
1220 }
1221
1222 /**
1223  * ad_churn_machine - handle port churn's state machine
1224  * @port: the port we're looking at
1225  *
1226  */
1227 static void ad_churn_machine(struct port *port)
1228 {
1229         if (port->sm_vars & AD_PORT_CHURNED) {
1230                 port->sm_vars &= ~AD_PORT_CHURNED;
1231                 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1232                 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1233                 port->sm_churn_actor_timer_counter =
1234                         __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1235                 port->sm_churn_partner_timer_counter =
1236                          __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1237                 return;
1238         }
1239         if (port->sm_churn_actor_timer_counter &&
1240             !(--port->sm_churn_actor_timer_counter) &&
1241             port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1242                 if (port->actor_oper_port_state & LACP_STATE_SYNCHRONIZATION) {
1243                         port->sm_churn_actor_state = AD_NO_CHURN;
1244                 } else {
1245                         port->churn_actor_count++;
1246                         port->sm_churn_actor_state = AD_CHURN;
1247                 }
1248         }
1249         if (port->sm_churn_partner_timer_counter &&
1250             !(--port->sm_churn_partner_timer_counter) &&
1251             port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1252                 if (port->partner_oper.port_state & LACP_STATE_SYNCHRONIZATION) {
1253                         port->sm_churn_partner_state = AD_NO_CHURN;
1254                 } else {
1255                         port->churn_partner_count++;
1256                         port->sm_churn_partner_state = AD_CHURN;
1257                 }
1258         }
1259 }
1260
1261 /**
1262  * ad_tx_machine - handle a port's tx state machine
1263  * @port: the port we're looking at
1264  */
1265 static void ad_tx_machine(struct port *port)
1266 {
1267         /* check if tx timer expired, to verify that we do not send more than
1268          * 3 packets per second
1269          */
1270         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1271                 /* check if there is something to send */
1272                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1273                         __update_lacpdu_from_port(port);
1274
1275                         if (ad_lacpdu_send(port) >= 0) {
1276                                 slave_dbg(port->slave->bond->dev,
1277                                           port->slave->dev,
1278                                           "Sent LACPDU on port %d\n",
1279                                           port->actor_port_number);
1280
1281                                 /* mark ntt as false, so it will not be sent
1282                                  * again until demanded
1283                                  */
1284                                 port->ntt = false;
1285                         }
1286                 }
1287                 /* restart tx timer(to verify that we will not exceed
1288                  * AD_MAX_TX_IN_SECOND
1289                  */
1290                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1291         }
1292 }
1293
1294 /**
1295  * ad_periodic_machine - handle a port's periodic state machine
1296  * @port: the port we're looking at
1297  *
1298  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1299  */
1300 static void ad_periodic_machine(struct port *port)
1301 {
1302         periodic_states_t last_state;
1303
1304         /* keep current state machine state to compare later if it was changed */
1305         last_state = port->sm_periodic_state;
1306
1307         /* check if port was reinitialized */
1308         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1309             (!(port->actor_oper_port_state & LACP_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & LACP_STATE_LACP_ACTIVITY))
1310            ) {
1311                 port->sm_periodic_state = AD_NO_PERIODIC;
1312         }
1313         /* check if state machine should change state */
1314         else if (port->sm_periodic_timer_counter) {
1315                 /* check if periodic state machine expired */
1316                 if (!(--port->sm_periodic_timer_counter)) {
1317                         /* if expired then do tx */
1318                         port->sm_periodic_state = AD_PERIODIC_TX;
1319                 } else {
1320                         /* If not expired, check if there is some new timeout
1321                          * parameter from the partner state
1322                          */
1323                         switch (port->sm_periodic_state) {
1324                         case AD_FAST_PERIODIC:
1325                                 if (!(port->partner_oper.port_state
1326                                       & LACP_STATE_LACP_TIMEOUT))
1327                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1328                                 break;
1329                         case AD_SLOW_PERIODIC:
1330                                 if ((port->partner_oper.port_state & LACP_STATE_LACP_TIMEOUT)) {
1331                                         port->sm_periodic_timer_counter = 0;
1332                                         port->sm_periodic_state = AD_PERIODIC_TX;
1333                                 }
1334                                 break;
1335                         default:
1336                                 break;
1337                         }
1338                 }
1339         } else {
1340                 switch (port->sm_periodic_state) {
1341                 case AD_NO_PERIODIC:
1342                         port->sm_periodic_state = AD_FAST_PERIODIC;
1343                         break;
1344                 case AD_PERIODIC_TX:
1345                         if (!(port->partner_oper.port_state &
1346                             LACP_STATE_LACP_TIMEOUT))
1347                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1348                         else
1349                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1350                         break;
1351                 default:
1352                         break;
1353                 }
1354         }
1355
1356         /* check if the state machine was changed */
1357         if (port->sm_periodic_state != last_state) {
1358                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1359                           "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1360                           port->actor_port_number, last_state,
1361                           port->sm_periodic_state);
1362                 switch (port->sm_periodic_state) {
1363                 case AD_NO_PERIODIC:
1364                         port->sm_periodic_timer_counter = 0;
1365                         break;
1366                 case AD_FAST_PERIODIC:
1367                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1368                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1369                         break;
1370                 case AD_SLOW_PERIODIC:
1371                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1372                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1373                         break;
1374                 case AD_PERIODIC_TX:
1375                         port->ntt = true;
1376                         break;
1377                 default:
1378                         break;
1379                 }
1380         }
1381 }
1382
1383 /**
1384  * ad_port_selection_logic - select aggregation groups
1385  * @port: the port we're looking at
1386  * @update_slave_arr: Does slave array need update?
1387  *
1388  * Select aggregation groups, and assign each port for it's aggregetor. The
1389  * selection logic is called in the inititalization (after all the handshkes),
1390  * and after every lacpdu receive (if selected is off).
1391  */
1392 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1393 {
1394         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1395         struct port *last_port = NULL, *curr_port;
1396         struct list_head *iter;
1397         struct bonding *bond;
1398         struct slave *slave;
1399         int found = 0;
1400
1401         /* if the port is already Selected, do nothing */
1402         if (port->sm_vars & AD_PORT_SELECTED)
1403                 return;
1404
1405         bond = __get_bond_by_port(port);
1406
1407         /* if the port is connected to other aggregator, detach it */
1408         if (port->aggregator) {
1409                 /* detach the port from its former aggregator */
1410                 temp_aggregator = port->aggregator;
1411                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1412                      last_port = curr_port,
1413                      curr_port = curr_port->next_port_in_aggregator) {
1414                         if (curr_port == port) {
1415                                 temp_aggregator->num_of_ports--;
1416                                 /* if it is the first port attached to the
1417                                  * aggregator
1418                                  */
1419                                 if (!last_port) {
1420                                         temp_aggregator->lag_ports =
1421                                                 port->next_port_in_aggregator;
1422                                 } else {
1423                                         /* not the first port attached to the
1424                                          * aggregator
1425                                          */
1426                                         last_port->next_port_in_aggregator =
1427                                                 port->next_port_in_aggregator;
1428                                 }
1429
1430                                 /* clear the port's relations to this
1431                                  * aggregator
1432                                  */
1433                                 port->aggregator = NULL;
1434                                 port->next_port_in_aggregator = NULL;
1435                                 port->actor_port_aggregator_identifier = 0;
1436
1437                                 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n",
1438                                           port->actor_port_number,
1439                                           temp_aggregator->aggregator_identifier);
1440                                 /* if the aggregator is empty, clear its
1441                                  * parameters, and set it ready to be attached
1442                                  */
1443                                 if (!temp_aggregator->lag_ports)
1444                                         ad_clear_agg(temp_aggregator);
1445                                 break;
1446                         }
1447                 }
1448                 if (!curr_port) {
1449                         /* meaning: the port was related to an aggregator
1450                          * but was not on the aggregator port list
1451                          */
1452                         net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n",
1453                                              port->slave->bond->dev->name,
1454                                              port->slave->dev->name,
1455                                              port->actor_port_number,
1456                                              port->aggregator->aggregator_identifier);
1457                 }
1458         }
1459         /* search on all aggregators for a suitable aggregator for this port */
1460         bond_for_each_slave(bond, slave, iter) {
1461                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1462
1463                 /* keep a free aggregator for later use(if needed) */
1464                 if (!aggregator->lag_ports) {
1465                         if (!free_aggregator)
1466                                 free_aggregator = aggregator;
1467                         continue;
1468                 }
1469                 /* check if current aggregator suits us */
1470                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1471                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1472                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1473                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1474                     ) &&
1475                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1476                       !aggregator->is_individual)  /* but is not individual OR */
1477                     )
1478                    ) {
1479                         /* attach to the founded aggregator */
1480                         port->aggregator = aggregator;
1481                         port->actor_port_aggregator_identifier =
1482                                 port->aggregator->aggregator_identifier;
1483                         port->next_port_in_aggregator = aggregator->lag_ports;
1484                         port->aggregator->num_of_ports++;
1485                         aggregator->lag_ports = port;
1486                         slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n",
1487                                   port->actor_port_number,
1488                                   port->aggregator->aggregator_identifier);
1489
1490                         /* mark this port as selected */
1491                         port->sm_vars |= AD_PORT_SELECTED;
1492                         found = 1;
1493                         break;
1494                 }
1495         }
1496
1497         /* the port couldn't find an aggregator - attach it to a new
1498          * aggregator
1499          */
1500         if (!found) {
1501                 if (free_aggregator) {
1502                         /* assign port a new aggregator */
1503                         port->aggregator = free_aggregator;
1504                         port->actor_port_aggregator_identifier =
1505                                 port->aggregator->aggregator_identifier;
1506
1507                         /* update the new aggregator's parameters
1508                          * if port was responsed from the end-user
1509                          */
1510                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1511                                 /* if port is full duplex */
1512                                 port->aggregator->is_individual = false;
1513                         else
1514                                 port->aggregator->is_individual = true;
1515
1516                         port->aggregator->actor_admin_aggregator_key =
1517                                 port->actor_admin_port_key;
1518                         port->aggregator->actor_oper_aggregator_key =
1519                                 port->actor_oper_port_key;
1520                         port->aggregator->partner_system =
1521                                 port->partner_oper.system;
1522                         port->aggregator->partner_system_priority =
1523                                 port->partner_oper.system_priority;
1524                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1525                         port->aggregator->receive_state = 1;
1526                         port->aggregator->transmit_state = 1;
1527                         port->aggregator->lag_ports = port;
1528                         port->aggregator->num_of_ports++;
1529
1530                         /* mark this port as selected */
1531                         port->sm_vars |= AD_PORT_SELECTED;
1532
1533                         slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n",
1534                                   port->actor_port_number,
1535                                   port->aggregator->aggregator_identifier);
1536                 } else {
1537                         slave_err(bond->dev, port->slave->dev,
1538                                   "Port %d did not find a suitable aggregator\n",
1539                                   port->actor_port_number);
1540                 }
1541         }
1542         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1543          * in all aggregator's ports, else set ready=FALSE in all
1544          * aggregator's ports
1545          */
1546         __set_agg_ports_ready(port->aggregator,
1547                               __agg_ports_are_ready(port->aggregator));
1548
1549         aggregator = __get_first_agg(port);
1550         ad_agg_selection_logic(aggregator, update_slave_arr);
1551
1552         if (!port->aggregator->is_active)
1553                 port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
1554 }
1555
1556 /* Decide if "agg" is a better choice for the new active aggregator that
1557  * the current best, according to the ad_select policy.
1558  */
1559 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1560                                                 struct aggregator *curr)
1561 {
1562         /* 0. If no best, select current.
1563          *
1564          * 1. If the current agg is not individual, and the best is
1565          *    individual, select current.
1566          *
1567          * 2. If current agg is individual and the best is not, keep best.
1568          *
1569          * 3. Therefore, current and best are both individual or both not
1570          *    individual, so:
1571          *
1572          * 3a. If current agg partner replied, and best agg partner did not,
1573          *     select current.
1574          *
1575          * 3b. If current agg partner did not reply and best agg partner
1576          *     did reply, keep best.
1577          *
1578          * 4.  Therefore, current and best both have partner replies or
1579          *     both do not, so perform selection policy:
1580          *
1581          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1582          *     select by bandwidth.
1583          *
1584          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1585          */
1586         if (!best)
1587                 return curr;
1588
1589         if (!curr->is_individual && best->is_individual)
1590                 return curr;
1591
1592         if (curr->is_individual && !best->is_individual)
1593                 return best;
1594
1595         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1596                 return curr;
1597
1598         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1599                 return best;
1600
1601         switch (__get_agg_selection_mode(curr->lag_ports)) {
1602         case BOND_AD_COUNT:
1603                 if (__agg_active_ports(curr) > __agg_active_ports(best))
1604                         return curr;
1605
1606                 if (__agg_active_ports(curr) < __agg_active_ports(best))
1607                         return best;
1608
1609                 fallthrough;
1610         case BOND_AD_STABLE:
1611         case BOND_AD_BANDWIDTH:
1612                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1613                         return curr;
1614
1615                 break;
1616
1617         default:
1618                 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n",
1619                                      curr->slave->bond->dev->name,
1620                                      curr->slave->dev->name,
1621                                      __get_agg_selection_mode(curr->lag_ports));
1622                 break;
1623         }
1624
1625         return best;
1626 }
1627
1628 static int agg_device_up(const struct aggregator *agg)
1629 {
1630         struct port *port = agg->lag_ports;
1631
1632         if (!port)
1633                 return 0;
1634
1635         for (port = agg->lag_ports; port;
1636              port = port->next_port_in_aggregator) {
1637                 if (netif_running(port->slave->dev) &&
1638                     netif_carrier_ok(port->slave->dev))
1639                         return 1;
1640         }
1641
1642         return 0;
1643 }
1644
1645 /**
1646  * ad_agg_selection_logic - select an aggregation group for a team
1647  * @agg: the aggregator we're looking at
1648  * @update_slave_arr: Does slave array need update?
1649  *
1650  * It is assumed that only one aggregator may be selected for a team.
1651  *
1652  * The logic of this function is to select the aggregator according to
1653  * the ad_select policy:
1654  *
1655  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1656  * it, and to reselect the active aggregator only if the previous
1657  * aggregator has no more ports related to it.
1658  *
1659  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1660  * bandwidth, and reselect whenever a link state change takes place or the
1661  * set of slaves in the bond changes.
1662  *
1663  * BOND_AD_COUNT: select the aggregator with largest number of ports
1664  * (slaves), and reselect whenever a link state change takes place or the
1665  * set of slaves in the bond changes.
1666  *
1667  * FIXME: this function MUST be called with the first agg in the bond, or
1668  * __get_active_agg() won't work correctly. This function should be better
1669  * called with the bond itself, and retrieve the first agg from it.
1670  */
1671 static void ad_agg_selection_logic(struct aggregator *agg,
1672                                    bool *update_slave_arr)
1673 {
1674         struct aggregator *best, *active, *origin;
1675         struct bonding *bond = agg->slave->bond;
1676         struct list_head *iter;
1677         struct slave *slave;
1678         struct port *port;
1679
1680         rcu_read_lock();
1681         origin = agg;
1682         active = __get_active_agg(agg);
1683         best = (active && agg_device_up(active)) ? active : NULL;
1684
1685         bond_for_each_slave_rcu(bond, slave, iter) {
1686                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1687
1688                 agg->is_active = 0;
1689
1690                 if (__agg_active_ports(agg) && agg_device_up(agg))
1691                         best = ad_agg_selection_test(best, agg);
1692         }
1693
1694         if (best &&
1695             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1696                 /* For the STABLE policy, don't replace the old active
1697                  * aggregator if it's still active (it has an answering
1698                  * partner) or if both the best and active don't have an
1699                  * answering partner.
1700                  */
1701                 if (active && active->lag_ports &&
1702                     __agg_active_ports(active) &&
1703                     (__agg_has_partner(active) ||
1704                      (!__agg_has_partner(active) &&
1705                      !__agg_has_partner(best)))) {
1706                         if (!(!active->actor_oper_aggregator_key &&
1707                               best->actor_oper_aggregator_key)) {
1708                                 best = NULL;
1709                                 active->is_active = 1;
1710                         }
1711                 }
1712         }
1713
1714         if (best && (best == active)) {
1715                 best = NULL;
1716                 active->is_active = 1;
1717         }
1718
1719         /* if there is new best aggregator, activate it */
1720         if (best) {
1721                 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1722                            best->slave ? best->slave->dev->name : "NULL",
1723                            best->aggregator_identifier, best->num_of_ports,
1724                            best->actor_oper_aggregator_key,
1725                            best->partner_oper_aggregator_key,
1726                            best->is_individual, best->is_active);
1727                 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n",
1728                            best->slave ? best->slave->dev->name : "NULL",
1729                            best->lag_ports, best->slave);
1730
1731                 bond_for_each_slave_rcu(bond, slave, iter) {
1732                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1733
1734                         slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1735                                   agg->aggregator_identifier, agg->num_of_ports,
1736                                   agg->actor_oper_aggregator_key,
1737                                   agg->partner_oper_aggregator_key,
1738                                   agg->is_individual, agg->is_active);
1739                 }
1740
1741                 /* check if any partner replies */
1742                 if (best->is_individual)
1743                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1744                                              bond->dev->name);
1745
1746                 best->is_active = 1;
1747                 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n",
1748                            best->slave ? best->slave->dev->name : "NULL",
1749                            best->aggregator_identifier);
1750                 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1751                            best->slave ? best->slave->dev->name : "NULL",
1752                            best->aggregator_identifier, best->num_of_ports,
1753                            best->actor_oper_aggregator_key,
1754                            best->partner_oper_aggregator_key,
1755                            best->is_individual, best->is_active);
1756
1757                 /* disable the ports that were related to the former
1758                  * active_aggregator
1759                  */
1760                 if (active) {
1761                         for (port = active->lag_ports; port;
1762                              port = port->next_port_in_aggregator) {
1763                                 __disable_port(port);
1764                         }
1765                 }
1766                 /* Slave array needs update. */
1767                 *update_slave_arr = true;
1768         }
1769
1770         /* if the selected aggregator is of join individuals
1771          * (partner_system is NULL), enable their ports
1772          */
1773         active = __get_active_agg(origin);
1774
1775         if (active) {
1776                 if (!__agg_has_partner(active)) {
1777                         for (port = active->lag_ports; port;
1778                              port = port->next_port_in_aggregator) {
1779                                 __enable_port(port);
1780                         }
1781                 }
1782         }
1783
1784         rcu_read_unlock();
1785
1786         bond_3ad_set_carrier(bond);
1787 }
1788
1789 /**
1790  * ad_clear_agg - clear a given aggregator's parameters
1791  * @aggregator: the aggregator we're looking at
1792  */
1793 static void ad_clear_agg(struct aggregator *aggregator)
1794 {
1795         if (aggregator) {
1796                 aggregator->is_individual = false;
1797                 aggregator->actor_admin_aggregator_key = 0;
1798                 aggregator->actor_oper_aggregator_key = 0;
1799                 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1800                 aggregator->partner_system_priority = 0;
1801                 aggregator->partner_oper_aggregator_key = 0;
1802                 aggregator->receive_state = 0;
1803                 aggregator->transmit_state = 0;
1804                 aggregator->lag_ports = NULL;
1805                 aggregator->is_active = 0;
1806                 aggregator->num_of_ports = 0;
1807                 pr_debug("%s: LAG %d was cleared\n",
1808                          aggregator->slave ?
1809                          aggregator->slave->dev->name : "NULL",
1810                          aggregator->aggregator_identifier);
1811         }
1812 }
1813
1814 /**
1815  * ad_initialize_agg - initialize a given aggregator's parameters
1816  * @aggregator: the aggregator we're looking at
1817  */
1818 static void ad_initialize_agg(struct aggregator *aggregator)
1819 {
1820         if (aggregator) {
1821                 ad_clear_agg(aggregator);
1822
1823                 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1824                 aggregator->aggregator_identifier = 0;
1825                 aggregator->slave = NULL;
1826         }
1827 }
1828
1829 /**
1830  * ad_initialize_port - initialize a given port's parameters
1831  * @port: the port we're looking at
1832  * @lacp_fast: boolean. whether fast periodic should be used
1833  */
1834 static void ad_initialize_port(struct port *port, int lacp_fast)
1835 {
1836         static const struct port_params tmpl = {
1837                 .system_priority = 0xffff,
1838                 .key             = 1,
1839                 .port_number     = 1,
1840                 .port_priority   = 0xff,
1841                 .port_state      = 1,
1842         };
1843         static const struct lacpdu lacpdu = {
1844                 .subtype                = 0x01,
1845                 .version_number = 0x01,
1846                 .tlv_type_actor_info = 0x01,
1847                 .actor_information_length = 0x14,
1848                 .tlv_type_partner_info = 0x02,
1849                 .partner_information_length = 0x14,
1850                 .tlv_type_collector_info = 0x03,
1851                 .collector_information_length = 0x10,
1852                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1853         };
1854
1855         if (port) {
1856                 port->actor_port_priority = 0xff;
1857                 port->actor_port_aggregator_identifier = 0;
1858                 port->ntt = false;
1859                 port->actor_admin_port_state = LACP_STATE_AGGREGATION |
1860                                                LACP_STATE_LACP_ACTIVITY;
1861                 port->actor_oper_port_state  = LACP_STATE_AGGREGATION |
1862                                                LACP_STATE_LACP_ACTIVITY;
1863
1864                 if (lacp_fast)
1865                         port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
1866
1867                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1868                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1869
1870                 port->is_enabled = true;
1871                 /* private parameters */
1872                 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1873                 port->sm_rx_state = 0;
1874                 port->sm_rx_timer_counter = 0;
1875                 port->sm_periodic_state = 0;
1876                 port->sm_periodic_timer_counter = 0;
1877                 port->sm_mux_state = 0;
1878                 port->sm_mux_timer_counter = 0;
1879                 port->sm_tx_state = 0;
1880                 port->aggregator = NULL;
1881                 port->next_port_in_aggregator = NULL;
1882                 port->transaction_id = 0;
1883
1884                 port->sm_churn_actor_timer_counter = 0;
1885                 port->sm_churn_actor_state = 0;
1886                 port->churn_actor_count = 0;
1887                 port->sm_churn_partner_timer_counter = 0;
1888                 port->sm_churn_partner_state = 0;
1889                 port->churn_partner_count = 0;
1890
1891                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1892         }
1893 }
1894
1895 /**
1896  * ad_enable_collecting_distributing - enable a port's transmit/receive
1897  * @port: the port we're looking at
1898  * @update_slave_arr: Does slave array need update?
1899  *
1900  * Enable @port if it's in an active aggregator
1901  */
1902 static void ad_enable_collecting_distributing(struct port *port,
1903                                               bool *update_slave_arr)
1904 {
1905         if (port->aggregator->is_active) {
1906                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1907                           "Enabling port %d (LAG %d)\n",
1908                           port->actor_port_number,
1909                           port->aggregator->aggregator_identifier);
1910                 __enable_port(port);
1911                 /* Slave array needs update */
1912                 *update_slave_arr = true;
1913         }
1914 }
1915
1916 /**
1917  * ad_disable_collecting_distributing - disable a port's transmit/receive
1918  * @port: the port we're looking at
1919  * @update_slave_arr: Does slave array need update?
1920  */
1921 static void ad_disable_collecting_distributing(struct port *port,
1922                                                bool *update_slave_arr)
1923 {
1924         if (port->aggregator &&
1925             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1926                                &(null_mac_addr))) {
1927                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1928                           "Disabling port %d (LAG %d)\n",
1929                           port->actor_port_number,
1930                           port->aggregator->aggregator_identifier);
1931                 __disable_port(port);
1932                 /* Slave array needs an update */
1933                 *update_slave_arr = true;
1934         }
1935 }
1936
1937 /**
1938  * ad_marker_info_received - handle receive of a Marker information frame
1939  * @marker_info: Marker info received
1940  * @port: the port we're looking at
1941  */
1942 static void ad_marker_info_received(struct bond_marker *marker_info,
1943                                     struct port *port)
1944 {
1945         struct bond_marker marker;
1946
1947         atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx);
1948         atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx);
1949
1950         /* copy the received marker data to the response marker */
1951         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1952         /* change the marker subtype to marker response */
1953         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1954
1955         /* send the marker response */
1956         if (ad_marker_send(port, &marker) >= 0)
1957                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1958                           "Sent Marker Response on port %d\n",
1959                           port->actor_port_number);
1960 }
1961
1962 /**
1963  * ad_marker_response_received - handle receive of a marker response frame
1964  * @marker: marker PDU received
1965  * @port: the port we're looking at
1966  *
1967  * This function does nothing since we decided not to implement send and handle
1968  * response for marker PDU's, in this stage, but only to respond to marker
1969  * information.
1970  */
1971 static void ad_marker_response_received(struct bond_marker *marker,
1972                                         struct port *port)
1973 {
1974         atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx);
1975         atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx);
1976
1977         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1978 }
1979
1980 /* ========= AD exported functions to the main bonding code ========= */
1981
1982 /* Check aggregators status in team every T seconds */
1983 #define AD_AGGREGATOR_SELECTION_TIMER  8
1984
1985 /**
1986  * bond_3ad_initiate_agg_selection - initate aggregator selection
1987  * @bond: bonding struct
1988  * @timeout: timeout value to set
1989  *
1990  * Set the aggregation selection timer, to initiate an agg selection in
1991  * the very near future.  Called during first initialization, and during
1992  * any down to up transitions of the bond.
1993  */
1994 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1995 {
1996         BOND_AD_INFO(bond).agg_select_timer = timeout;
1997 }
1998
1999 /**
2000  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
2001  * @bond: bonding struct to work on
2002  * @tick_resolution: tick duration (millisecond resolution)
2003  *
2004  * Can be called only after the mac address of the bond is set.
2005  */
2006 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
2007 {
2008         /* check that the bond is not initialized yet */
2009         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
2010                                 bond->dev->dev_addr)) {
2011
2012                 BOND_AD_INFO(bond).aggregator_identifier = 0;
2013
2014                 BOND_AD_INFO(bond).system.sys_priority =
2015                         bond->params.ad_actor_sys_prio;
2016                 if (is_zero_ether_addr(bond->params.ad_actor_system))
2017                         BOND_AD_INFO(bond).system.sys_mac_addr =
2018                             *((struct mac_addr *)bond->dev->dev_addr);
2019                 else
2020                         BOND_AD_INFO(bond).system.sys_mac_addr =
2021                             *((struct mac_addr *)bond->params.ad_actor_system);
2022
2023                 /* initialize how many times this module is called in one
2024                  * second (should be about every 100ms)
2025                  */
2026                 ad_ticks_per_sec = tick_resolution;
2027
2028                 bond_3ad_initiate_agg_selection(bond,
2029                                                 AD_AGGREGATOR_SELECTION_TIMER *
2030                                                 ad_ticks_per_sec);
2031         }
2032 }
2033
2034 /**
2035  * bond_3ad_bind_slave - initialize a slave's port
2036  * @slave: slave struct to work on
2037  *
2038  * Returns:   0 on success
2039  *          < 0 on error
2040  */
2041 void bond_3ad_bind_slave(struct slave *slave)
2042 {
2043         struct bonding *bond = bond_get_bond_by_slave(slave);
2044         struct port *port;
2045         struct aggregator *aggregator;
2046
2047         /* check that the slave has not been initialized yet. */
2048         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2049
2050                 /* port initialization */
2051                 port = &(SLAVE_AD_INFO(slave)->port);
2052
2053                 ad_initialize_port(port, bond->params.lacp_fast);
2054
2055                 port->slave = slave;
2056                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2057                 /* key is determined according to the link speed, duplex and
2058                  * user key
2059                  */
2060                 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2061                 ad_update_actor_keys(port, false);
2062                 /* actor system is the bond's system */
2063                 __ad_actor_update_port(port);
2064                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2065                  * lacpdu's are sent in one second)
2066                  */
2067                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2068
2069                 __disable_port(port);
2070
2071                 /* aggregator initialization */
2072                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2073
2074                 ad_initialize_agg(aggregator);
2075
2076                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2077                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2078                 aggregator->slave = slave;
2079                 aggregator->is_active = 0;
2080                 aggregator->num_of_ports = 0;
2081         }
2082 }
2083
2084 /**
2085  * bond_3ad_unbind_slave - deinitialize a slave's port
2086  * @slave: slave struct to work on
2087  *
2088  * Search for the aggregator that is related to this port, remove the
2089  * aggregator and assign another aggregator for other port related to it
2090  * (if any), and remove the port.
2091  */
2092 void bond_3ad_unbind_slave(struct slave *slave)
2093 {
2094         struct port *port, *prev_port, *temp_port;
2095         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2096         int select_new_active_agg = 0;
2097         struct bonding *bond = slave->bond;
2098         struct slave *slave_iter;
2099         struct list_head *iter;
2100         bool dummy_slave_update; /* Ignore this value as caller updates array */
2101
2102         /* Sync against bond_3ad_state_machine_handler() */
2103         spin_lock_bh(&bond->mode_lock);
2104         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2105         port = &(SLAVE_AD_INFO(slave)->port);
2106
2107         /* if slave is null, the whole port is not initialized */
2108         if (!port->slave) {
2109                 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n");
2110                 goto out;
2111         }
2112
2113         slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n",
2114                   aggregator->aggregator_identifier);
2115
2116         /* Tell the partner that this port is not suitable for aggregation */
2117         port->actor_oper_port_state &= ~LACP_STATE_SYNCHRONIZATION;
2118         port->actor_oper_port_state &= ~LACP_STATE_COLLECTING;
2119         port->actor_oper_port_state &= ~LACP_STATE_DISTRIBUTING;
2120         port->actor_oper_port_state &= ~LACP_STATE_AGGREGATION;
2121         __update_lacpdu_from_port(port);
2122         ad_lacpdu_send(port);
2123
2124         /* check if this aggregator is occupied */
2125         if (aggregator->lag_ports) {
2126                 /* check if there are other ports related to this aggregator
2127                  * except the port related to this slave(thats ensure us that
2128                  * there is a reason to search for new aggregator, and that we
2129                  * will find one
2130                  */
2131                 if ((aggregator->lag_ports != port) ||
2132                     (aggregator->lag_ports->next_port_in_aggregator)) {
2133                         /* find new aggregator for the related port(s) */
2134                         bond_for_each_slave(bond, slave_iter, iter) {
2135                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2136                                 /* if the new aggregator is empty, or it is
2137                                  * connected to our port only
2138                                  */
2139                                 if (!new_aggregator->lag_ports ||
2140                                     ((new_aggregator->lag_ports == port) &&
2141                                      !new_aggregator->lag_ports->next_port_in_aggregator))
2142                                         break;
2143                         }
2144                         if (!slave_iter)
2145                                 new_aggregator = NULL;
2146
2147                         /* if new aggregator found, copy the aggregator's
2148                          * parameters and connect the related lag_ports to the
2149                          * new aggregator
2150                          */
2151                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2152                                 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2153                                           aggregator->aggregator_identifier,
2154                                           new_aggregator->aggregator_identifier);
2155
2156                                 if ((new_aggregator->lag_ports == port) &&
2157                                     new_aggregator->is_active) {
2158                                         slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2159                                         select_new_active_agg = 1;
2160                                 }
2161
2162                                 new_aggregator->is_individual = aggregator->is_individual;
2163                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2164                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2165                                 new_aggregator->partner_system = aggregator->partner_system;
2166                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2167                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2168                                 new_aggregator->receive_state = aggregator->receive_state;
2169                                 new_aggregator->transmit_state = aggregator->transmit_state;
2170                                 new_aggregator->lag_ports = aggregator->lag_ports;
2171                                 new_aggregator->is_active = aggregator->is_active;
2172                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2173
2174                                 /* update the information that is written on
2175                                  * the ports about the aggregator
2176                                  */
2177                                 for (temp_port = aggregator->lag_ports; temp_port;
2178                                      temp_port = temp_port->next_port_in_aggregator) {
2179                                         temp_port->aggregator = new_aggregator;
2180                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2181                                 }
2182
2183                                 ad_clear_agg(aggregator);
2184
2185                                 if (select_new_active_agg)
2186                                         ad_agg_selection_logic(__get_first_agg(port),
2187                                                                &dummy_slave_update);
2188                         } else {
2189                                 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2190                         }
2191                 } else {
2192                         /* in case that the only port related to this
2193                          * aggregator is the one we want to remove
2194                          */
2195                         select_new_active_agg = aggregator->is_active;
2196                         ad_clear_agg(aggregator);
2197                         if (select_new_active_agg) {
2198                                 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2199                                 /* select new active aggregator */
2200                                 temp_aggregator = __get_first_agg(port);
2201                                 if (temp_aggregator)
2202                                         ad_agg_selection_logic(temp_aggregator,
2203                                                                &dummy_slave_update);
2204                         }
2205                 }
2206         }
2207
2208         slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number);
2209
2210         /* find the aggregator that this port is connected to */
2211         bond_for_each_slave(bond, slave_iter, iter) {
2212                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2213                 prev_port = NULL;
2214                 /* search the port in the aggregator's related ports */
2215                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2216                      prev_port = temp_port,
2217                      temp_port = temp_port->next_port_in_aggregator) {
2218                         if (temp_port == port) {
2219                                 /* the aggregator found - detach the port from
2220                                  * this aggregator
2221                                  */
2222                                 if (prev_port)
2223                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2224                                 else
2225                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2226                                 temp_aggregator->num_of_ports--;
2227                                 if (__agg_active_ports(temp_aggregator) == 0) {
2228                                         select_new_active_agg = temp_aggregator->is_active;
2229                                         ad_clear_agg(temp_aggregator);
2230                                         if (select_new_active_agg) {
2231                                                 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2232                                                 /* select new active aggregator */
2233                                                 ad_agg_selection_logic(__get_first_agg(port),
2234                                                                        &dummy_slave_update);
2235                                         }
2236                                 }
2237                                 break;
2238                         }
2239                 }
2240         }
2241         port->slave = NULL;
2242
2243 out:
2244         spin_unlock_bh(&bond->mode_lock);
2245 }
2246
2247 /**
2248  * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2249  * @bond: bonding struct to work on
2250  *
2251  * If an ad_actor setting gets changed we need to update the individual port
2252  * settings so the bond device will use the new values when it gets upped.
2253  */
2254 void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2255 {
2256         struct list_head *iter;
2257         struct slave *slave;
2258
2259         ASSERT_RTNL();
2260
2261         BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2262         if (is_zero_ether_addr(bond->params.ad_actor_system))
2263                 BOND_AD_INFO(bond).system.sys_mac_addr =
2264                     *((struct mac_addr *)bond->dev->dev_addr);
2265         else
2266                 BOND_AD_INFO(bond).system.sys_mac_addr =
2267                     *((struct mac_addr *)bond->params.ad_actor_system);
2268
2269         spin_lock_bh(&bond->mode_lock);
2270         bond_for_each_slave(bond, slave, iter) {
2271                 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2272
2273                 __ad_actor_update_port(port);
2274                 port->ntt = true;
2275         }
2276         spin_unlock_bh(&bond->mode_lock);
2277 }
2278
2279 /**
2280  * bond_3ad_state_machine_handler - handle state machines timeout
2281  * @work: work context to fetch bonding struct to work on from
2282  *
2283  * The state machine handling concept in this module is to check every tick
2284  * which state machine should operate any function. The execution order is
2285  * round robin, so when we have an interaction between state machines, the
2286  * reply of one to each other might be delayed until next tick.
2287  *
2288  * This function also complete the initialization when the agg_select_timer
2289  * times out, and it selects an aggregator for the ports that are yet not
2290  * related to any aggregator, and selects the active aggregator for a bond.
2291  */
2292 void bond_3ad_state_machine_handler(struct work_struct *work)
2293 {
2294         struct bonding *bond = container_of(work, struct bonding,
2295                                             ad_work.work);
2296         struct aggregator *aggregator;
2297         struct list_head *iter;
2298         struct slave *slave;
2299         struct port *port;
2300         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2301         bool update_slave_arr = false;
2302
2303         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2304          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2305          * concurrently due to incoming LACPDU as well.
2306          */
2307         spin_lock_bh(&bond->mode_lock);
2308         rcu_read_lock();
2309
2310         /* check if there are any slaves */
2311         if (!bond_has_slaves(bond))
2312                 goto re_arm;
2313
2314         /* check if agg_select_timer timer after initialize is timed out */
2315         if (BOND_AD_INFO(bond).agg_select_timer &&
2316             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2317                 slave = bond_first_slave_rcu(bond);
2318                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2319
2320                 /* select the active aggregator for the bond */
2321                 if (port) {
2322                         if (!port->slave) {
2323                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2324                                                      bond->dev->name);
2325                                 goto re_arm;
2326                         }
2327
2328                         aggregator = __get_first_agg(port);
2329                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2330                 }
2331                 bond_3ad_set_carrier(bond);
2332         }
2333
2334         /* for each port run the state machines */
2335         bond_for_each_slave_rcu(bond, slave, iter) {
2336                 port = &(SLAVE_AD_INFO(slave)->port);
2337                 if (!port->slave) {
2338                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2339                                             bond->dev->name);
2340                         goto re_arm;
2341                 }
2342
2343                 ad_rx_machine(NULL, port);
2344                 ad_periodic_machine(port);
2345                 ad_port_selection_logic(port, &update_slave_arr);
2346                 ad_mux_machine(port, &update_slave_arr);
2347                 ad_tx_machine(port);
2348                 ad_churn_machine(port);
2349
2350                 /* turn off the BEGIN bit, since we already handled it */
2351                 if (port->sm_vars & AD_PORT_BEGIN)
2352                         port->sm_vars &= ~AD_PORT_BEGIN;
2353         }
2354
2355 re_arm:
2356         bond_for_each_slave_rcu(bond, slave, iter) {
2357                 if (slave->should_notify) {
2358                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2359                         break;
2360                 }
2361         }
2362         rcu_read_unlock();
2363         spin_unlock_bh(&bond->mode_lock);
2364
2365         if (update_slave_arr)
2366                 bond_slave_arr_work_rearm(bond, 0);
2367
2368         if (should_notify_rtnl && rtnl_trylock()) {
2369                 bond_slave_state_notify(bond);
2370                 rtnl_unlock();
2371         }
2372         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2373 }
2374
2375 /**
2376  * bond_3ad_rx_indication - handle a received frame
2377  * @lacpdu: received lacpdu
2378  * @slave: slave struct to work on
2379  *
2380  * It is assumed that frames that were sent on this NIC don't returned as new
2381  * received frames (loopback). Since only the payload is given to this
2382  * function, it check for loopback.
2383  */
2384 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave)
2385 {
2386         struct bonding *bond = slave->bond;
2387         int ret = RX_HANDLER_ANOTHER;
2388         struct bond_marker *marker;
2389         struct port *port;
2390         atomic64_t *stat;
2391
2392         port = &(SLAVE_AD_INFO(slave)->port);
2393         if (!port->slave) {
2394                 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2395                                      slave->dev->name, slave->bond->dev->name);
2396                 return ret;
2397         }
2398
2399         switch (lacpdu->subtype) {
2400         case AD_TYPE_LACPDU:
2401                 ret = RX_HANDLER_CONSUMED;
2402                 slave_dbg(slave->bond->dev, slave->dev,
2403                           "Received LACPDU on port %d\n",
2404                           port->actor_port_number);
2405                 /* Protect against concurrent state machines */
2406                 spin_lock(&slave->bond->mode_lock);
2407                 ad_rx_machine(lacpdu, port);
2408                 spin_unlock(&slave->bond->mode_lock);
2409                 break;
2410         case AD_TYPE_MARKER:
2411                 ret = RX_HANDLER_CONSUMED;
2412                 /* No need to convert fields to Little Endian since we
2413                  * don't use the marker's fields.
2414                  */
2415                 marker = (struct bond_marker *)lacpdu;
2416                 switch (marker->tlv_type) {
2417                 case AD_MARKER_INFORMATION_SUBTYPE:
2418                         slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n",
2419                                   port->actor_port_number);
2420                         ad_marker_info_received(marker, port);
2421                         break;
2422                 case AD_MARKER_RESPONSE_SUBTYPE:
2423                         slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n",
2424                                   port->actor_port_number);
2425                         ad_marker_response_received(marker, port);
2426                         break;
2427                 default:
2428                         slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n",
2429                                   port->actor_port_number);
2430                         stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx;
2431                         atomic64_inc(stat);
2432                         stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx;
2433                         atomic64_inc(stat);
2434                 }
2435                 break;
2436         default:
2437                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx);
2438                 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx);
2439         }
2440
2441         return ret;
2442 }
2443
2444 /**
2445  * ad_update_actor_keys - Update the oper / admin keys for a port based on
2446  * its current speed and duplex settings.
2447  *
2448  * @port: the port we'are looking at
2449  * @reset: Boolean to just reset the speed and the duplex part of the key
2450  *
2451  * The logic to change the oper / admin keys is:
2452  * (a) A full duplex port can participate in LACP with partner.
2453  * (b) When the speed is changed, LACP need to be reinitiated.
2454  */
2455 static void ad_update_actor_keys(struct port *port, bool reset)
2456 {
2457         u8 duplex = 0;
2458         u16 ospeed = 0, speed = 0;
2459         u16 old_oper_key = port->actor_oper_port_key;
2460
2461         port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2462         if (!reset) {
2463                 speed = __get_link_speed(port);
2464                 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2465                 duplex = __get_duplex(port);
2466                 port->actor_admin_port_key |= (speed << 1) | duplex;
2467         }
2468         port->actor_oper_port_key = port->actor_admin_port_key;
2469
2470         if (old_oper_key != port->actor_oper_port_key) {
2471                 /* Only 'duplex' port participates in LACP */
2472                 if (duplex)
2473                         port->sm_vars |= AD_PORT_LACP_ENABLED;
2474                 else
2475                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2476
2477                 if (!reset) {
2478                         if (!speed) {
2479                                 slave_err(port->slave->bond->dev,
2480                                           port->slave->dev,
2481                                           "speed changed to 0 on port %d\n",
2482                                           port->actor_port_number);
2483                         } else if (duplex && ospeed != speed) {
2484                                 /* Speed change restarts LACP state-machine */
2485                                 port->sm_vars |= AD_PORT_BEGIN;
2486                         }
2487                 }
2488         }
2489 }
2490
2491 /**
2492  * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2493  * change indication
2494  *
2495  * @slave: slave struct to work on
2496  *
2497  * Handle reselection of aggregator (if needed) for this port.
2498  */
2499 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2500 {
2501         struct port *port;
2502
2503         port = &(SLAVE_AD_INFO(slave)->port);
2504
2505         /* if slave is null, the whole port is not initialized */
2506         if (!port->slave) {
2507                 slave_warn(slave->bond->dev, slave->dev,
2508                            "speed/duplex changed for uninitialized port\n");
2509                 return;
2510         }
2511
2512         spin_lock_bh(&slave->bond->mode_lock);
2513         ad_update_actor_keys(port, false);
2514         spin_unlock_bh(&slave->bond->mode_lock);
2515         slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n",
2516                   port->actor_port_number);
2517 }
2518
2519 /**
2520  * bond_3ad_handle_link_change - handle a slave's link status change indication
2521  * @slave: slave struct to work on
2522  * @link: whether the link is now up or down
2523  *
2524  * Handle reselection of aggregator (if needed) for this port.
2525  */
2526 void bond_3ad_handle_link_change(struct slave *slave, char link)
2527 {
2528         struct aggregator *agg;
2529         struct port *port;
2530         bool dummy;
2531
2532         port = &(SLAVE_AD_INFO(slave)->port);
2533
2534         /* if slave is null, the whole port is not initialized */
2535         if (!port->slave) {
2536                 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n");
2537                 return;
2538         }
2539
2540         spin_lock_bh(&slave->bond->mode_lock);
2541         /* on link down we are zeroing duplex and speed since
2542          * some of the adaptors(ce1000.lan) report full duplex/speed
2543          * instead of N/A(duplex) / 0(speed).
2544          *
2545          * on link up we are forcing recheck on the duplex and speed since
2546          * some of he adaptors(ce1000.lan) report.
2547          */
2548         if (link == BOND_LINK_UP) {
2549                 port->is_enabled = true;
2550                 ad_update_actor_keys(port, false);
2551         } else {
2552                 /* link has failed */
2553                 port->is_enabled = false;
2554                 ad_update_actor_keys(port, true);
2555         }
2556         agg = __get_first_agg(port);
2557         ad_agg_selection_logic(agg, &dummy);
2558
2559         spin_unlock_bh(&slave->bond->mode_lock);
2560
2561         slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n",
2562                   port->actor_port_number,
2563                   link == BOND_LINK_UP ? "UP" : "DOWN");
2564
2565         /* RTNL is held and mode_lock is released so it's safe
2566          * to update slave_array here.
2567          */
2568         bond_update_slave_arr(slave->bond, NULL);
2569 }
2570
2571 /**
2572  * bond_3ad_set_carrier - set link state for bonding master
2573  * @bond: bonding structure
2574  *
2575  * if we have an active aggregator, we're up, if not, we're down.
2576  * Presumes that we cannot have an active aggregator if there are
2577  * no slaves with link up.
2578  *
2579  * This behavior complies with IEEE 802.3 section 43.3.9.
2580  *
2581  * Called by bond_set_carrier(). Return zero if carrier state does not
2582  * change, nonzero if it does.
2583  */
2584 int bond_3ad_set_carrier(struct bonding *bond)
2585 {
2586         struct aggregator *active;
2587         struct slave *first_slave;
2588         int ret = 1;
2589
2590         rcu_read_lock();
2591         first_slave = bond_first_slave_rcu(bond);
2592         if (!first_slave) {
2593                 ret = 0;
2594                 goto out;
2595         }
2596         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2597         if (active) {
2598                 /* are enough slaves available to consider link up? */
2599                 if (__agg_active_ports(active) < bond->params.min_links) {
2600                         if (netif_carrier_ok(bond->dev)) {
2601                                 netif_carrier_off(bond->dev);
2602                                 goto out;
2603                         }
2604                 } else if (!netif_carrier_ok(bond->dev)) {
2605                         netif_carrier_on(bond->dev);
2606                         goto out;
2607                 }
2608         } else if (netif_carrier_ok(bond->dev)) {
2609                 netif_carrier_off(bond->dev);
2610         }
2611 out:
2612         rcu_read_unlock();
2613         return ret;
2614 }
2615
2616 /**
2617  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2618  * @bond: bonding struct to work on
2619  * @ad_info: ad_info struct to fill with the bond's info
2620  *
2621  * Returns:   0 on success
2622  *          < 0 on error
2623  */
2624 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2625                                    struct ad_info *ad_info)
2626 {
2627         struct aggregator *aggregator = NULL;
2628         struct list_head *iter;
2629         struct slave *slave;
2630         struct port *port;
2631
2632         bond_for_each_slave_rcu(bond, slave, iter) {
2633                 port = &(SLAVE_AD_INFO(slave)->port);
2634                 if (port->aggregator && port->aggregator->is_active) {
2635                         aggregator = port->aggregator;
2636                         break;
2637                 }
2638         }
2639
2640         if (!aggregator)
2641                 return -1;
2642
2643         ad_info->aggregator_id = aggregator->aggregator_identifier;
2644         ad_info->ports = __agg_active_ports(aggregator);
2645         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2646         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2647         ether_addr_copy(ad_info->partner_system,
2648                         aggregator->partner_system.mac_addr_value);
2649         return 0;
2650 }
2651
2652 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2653 {
2654         int ret;
2655
2656         rcu_read_lock();
2657         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2658         rcu_read_unlock();
2659
2660         return ret;
2661 }
2662
2663 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2664                          struct slave *slave)
2665 {
2666         struct lacpdu *lacpdu, _lacpdu;
2667
2668         if (skb->protocol != PKT_TYPE_LACPDU)
2669                 return RX_HANDLER_ANOTHER;
2670
2671         if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2672                 return RX_HANDLER_ANOTHER;
2673
2674         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2675         if (!lacpdu) {
2676                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx);
2677                 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx);
2678                 return RX_HANDLER_ANOTHER;
2679         }
2680
2681         return bond_3ad_rx_indication(lacpdu, slave);
2682 }
2683
2684 /**
2685  * bond_3ad_update_lacp_rate - change the lacp rate
2686  * @bond: bonding struct
2687  *
2688  * When modify lacp_rate parameter via sysfs,
2689  * update actor_oper_port_state of each port.
2690  *
2691  * Hold bond->mode_lock,
2692  * so we can modify port->actor_oper_port_state,
2693  * no matter bond is up or down.
2694  */
2695 void bond_3ad_update_lacp_rate(struct bonding *bond)
2696 {
2697         struct port *port = NULL;
2698         struct list_head *iter;
2699         struct slave *slave;
2700         int lacp_fast;
2701
2702         lacp_fast = bond->params.lacp_fast;
2703         spin_lock_bh(&bond->mode_lock);
2704         bond_for_each_slave(bond, slave, iter) {
2705                 port = &(SLAVE_AD_INFO(slave)->port);
2706                 if (lacp_fast)
2707                         port->actor_oper_port_state |= LACP_STATE_LACP_TIMEOUT;
2708                 else
2709                         port->actor_oper_port_state &= ~LACP_STATE_LACP_TIMEOUT;
2710         }
2711         spin_unlock_bh(&bond->mode_lock);
2712 }
2713
2714 size_t bond_3ad_stats_size(void)
2715 {
2716         return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */
2717                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */
2718                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */
2719                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */
2720                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */
2721                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */
2722                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */
2723                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */
2724                nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */
2725 }
2726
2727 int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats)
2728 {
2729         u64 val;
2730
2731         val = atomic64_read(&stats->lacpdu_rx);
2732         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val,
2733                               BOND_3AD_STAT_PAD))
2734                 return -EMSGSIZE;
2735         val = atomic64_read(&stats->lacpdu_tx);
2736         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val,
2737                               BOND_3AD_STAT_PAD))
2738                 return -EMSGSIZE;
2739         val = atomic64_read(&stats->lacpdu_unknown_rx);
2740         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val,
2741                               BOND_3AD_STAT_PAD))
2742                 return -EMSGSIZE;
2743         val = atomic64_read(&stats->lacpdu_illegal_rx);
2744         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val,
2745                               BOND_3AD_STAT_PAD))
2746                 return -EMSGSIZE;
2747
2748         val = atomic64_read(&stats->marker_rx);
2749         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val,
2750                               BOND_3AD_STAT_PAD))
2751                 return -EMSGSIZE;
2752         val = atomic64_read(&stats->marker_tx);
2753         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val,
2754                               BOND_3AD_STAT_PAD))
2755                 return -EMSGSIZE;
2756         val = atomic64_read(&stats->marker_resp_rx);
2757         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val,
2758                               BOND_3AD_STAT_PAD))
2759                 return -EMSGSIZE;
2760         val = atomic64_read(&stats->marker_resp_tx);
2761         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val,
2762                               BOND_3AD_STAT_PAD))
2763                 return -EMSGSIZE;
2764         val = atomic64_read(&stats->marker_unknown_rx);
2765         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val,
2766                               BOND_3AD_STAT_PAD))
2767                 return -EMSGSIZE;
2768
2769         return 0;
2770 }