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