drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/skbuff.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/if_bonding.h>
  32 #include <linux/pkt_sched.h>
  33 #include <net/net_namespace.h>
  34 #include "bonding.h"
  35 #include "bond_3ad.h"
  36
  37 /* General definitions */
  38 #define AD_SHORT_TIMEOUT           1
  39 #define AD_LONG_TIMEOUT            0
  40 #define AD_STANDBY                 0x2
  41 #define AD_MAX_TX_IN_SECOND        3
  42 #define AD_COLLECTOR_MAX_DELAY     0
  43
  44 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  45 #define AD_FAST_PERIODIC_TIME      1
  46 #define AD_SLOW_PERIODIC_TIME      30
  47 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  48 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  49 #define AD_CHURN_DETECTION_TIME    60
  50 #define AD_AGGREGATE_WAIT_TIME     2
  51
  52 /* Port state definitions (43.4.2.2 in the 802.3ad standard) */
  53 #define AD_STATE_LACP_ACTIVITY   0x1
  54 #define AD_STATE_LACP_TIMEOUT    0x2
  55 #define AD_STATE_AGGREGATION     0x4
  56 #define AD_STATE_SYNCHRONIZATION 0x8
  57 #define AD_STATE_COLLECTING      0x10
  58 #define AD_STATE_DISTRIBUTING    0x20
  59 #define AD_STATE_DEFAULTED       0x40
  60 #define AD_STATE_EXPIRED         0x80
  61
  62 /* Port Variables definitions used by the State Machines (43.4.7 in the
  63  * 802.3ad standard)
  64  */
  65 #define AD_PORT_BEGIN           0x1
  66 #define AD_PORT_LACP_ENABLED    0x2
  67 #define AD_PORT_ACTOR_CHURN     0x4
  68 #define AD_PORT_PARTNER_CHURN   0x8
  69 #define AD_PORT_READY           0x10
  70 #define AD_PORT_READY_N         0x20
  71 #define AD_PORT_MATCHED         0x40
  72 #define AD_PORT_STANDBY         0x80
  73 #define AD_PORT_SELECTED        0x100
  74 #define AD_PORT_MOVED           0x200
  75
  76 /* Port Key definitions
  77  * key is determined according to the link speed, duplex and
  78  * user key (which is yet not supported)
  79  * --------------------------------------------------------------
  80  * Port key :   | User key      | Speed         | Duplex        |
  81  * --------------------------------------------------------------
  82  * 16             6               1               0
  83  */
  84 #define  AD_DUPLEX_KEY_BITS    0x1
  85 #define  AD_SPEED_KEY_BITS     0x3E
  86 #define  AD_USER_KEY_BITS      0xFFC0
  87
  88 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  89 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  90 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  91 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  92 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  93
  94 /* compare MAC addresses */
  95 #define MAC_ADDRESS_EQUAL(A, B) \
  96         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
  97
  98 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
  99 static u16 ad_ticks_per_sec;
 100 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
 101
 102 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 103
 104 /* ================= main 802.3ad protocol functions ================== */
 105 static int ad_lacpdu_send(struct port *port);
 106 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 107 static void ad_mux_machine(struct port *port);
 108 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 109 static void ad_tx_machine(struct port *port);
 110 static void ad_periodic_machine(struct port *port);
 111 static void ad_port_selection_logic(struct port *port);
 112 static void ad_agg_selection_logic(struct aggregator *aggregator);
 113 static void ad_clear_agg(struct aggregator *aggregator);
 114 static void ad_initialize_agg(struct aggregator *aggregator);
 115 static void ad_initialize_port(struct port *port, int lacp_fast);
 116 static void ad_enable_collecting_distributing(struct port *port);
 117 static void ad_disable_collecting_distributing(struct port *port);
 118 static void ad_marker_info_received(struct bond_marker *marker_info,
 119                                     struct port *port);
 120 static void ad_marker_response_received(struct bond_marker *marker,
 121                                         struct port *port);
 122
 123
 124 /* ================= api to bonding and kernel code ================== */
 125
 126 /**
 127  * __get_bond_by_port - get the port's bonding struct
 128  * @port: the port we're looking at
 129  *
 130  * Return @port's bonding struct, or %NULL if it can't be found.
 131  */
 132 static inline struct bonding *__get_bond_by_port(struct port *port)
 133 {
 134         if (port->slave == NULL)
 135                 return NULL;
 136
 137         return bond_get_bond_by_slave(port->slave);
 138 }
 139
 140 /**
 141  * __get_first_agg - get the first aggregator in the bond
 142  * @bond: the bond we're looking at
 143  *
 144  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 145  * found.
 146  * The caller must hold RCU or RTNL lock.
 147  */
 148 static inline struct aggregator *__get_first_agg(struct port *port)
 149 {
 150         struct bonding *bond = __get_bond_by_port(port);
 151         struct slave *first_slave;
 152         struct aggregator *agg;
 153
 154         /* If there's no bond for this port, or bond has no slaves */
 155         if (bond == NULL)
 156                 return NULL;
 157
 158         rcu_read_lock();
 159         first_slave = bond_first_slave_rcu(bond);
 160         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 161         rcu_read_unlock();
 162
 163         return agg;
 164 }
 165
 166 /**
 167  * __agg_has_partner - see if we have a partner
 168  * @agg: the agregator we're looking at
 169  *
 170  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 171  * address for the partner). Return 0 if not.
 172  */
 173 static inline int __agg_has_partner(struct aggregator *agg)
 174 {
 175         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 176 }
 177
 178 /**
 179  * __disable_port - disable the port's slave
 180  * @port: the port we're looking at
 181  */
 182 static inline void __disable_port(struct port *port)
 183 {
 184         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 185 }
 186
 187 /**
 188  * __enable_port - enable the port's slave, if it's up
 189  * @port: the port we're looking at
 190  */
 191 static inline void __enable_port(struct port *port)
 192 {
 193         struct slave *slave = port->slave;
 194
 195         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 196                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 197 }
 198
 199 /**
 200  * __port_is_enabled - check if the port's slave is in active state
 201  * @port: the port we're looking at
 202  */
 203 static inline int __port_is_enabled(struct port *port)
 204 {
 205         return bond_is_active_slave(port->slave);
 206 }
 207
 208 /**
 209  * __get_agg_selection_mode - get the aggregator selection mode
 210  * @port: the port we're looking at
 211  *
 212  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 213  */
 214 static inline u32 __get_agg_selection_mode(struct port *port)
 215 {
 216         struct bonding *bond = __get_bond_by_port(port);
 217
 218         if (bond == NULL)
 219                 return BOND_AD_STABLE;
 220
 221         return bond->params.ad_select;
 222 }
 223
 224 /**
 225  * __check_agg_selection_timer - check if the selection timer has expired
 226  * @port: the port we're looking at
 227  */
 228 static inline int __check_agg_selection_timer(struct port *port)
 229 {
 230         struct bonding *bond = __get_bond_by_port(port);
 231
 232         if (bond == NULL)
 233                 return 0;
 234
 235         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 236 }
 237
 238 /**
 239  * __get_state_machine_lock - lock the port's state machines
 240  * @port: the port we're looking at
 241  */
 242 static inline void __get_state_machine_lock(struct port *port)
 243 {
 244         spin_lock_bh(&(SLAVE_AD_INFO(port->slave)->state_machine_lock));
 245 }
 246
 247 /**
 248  * __release_state_machine_lock - unlock the port's state machines
 249  * @port: the port we're looking at
 250  */
 251 static inline void __release_state_machine_lock(struct port *port)
 252 {
 253         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave)->state_machine_lock));
 254 }
 255
 256 /**
 257  * __get_link_speed - get a port's speed
 258  * @port: the port we're looking at
 259  *
 260  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 261  *     0,
 262  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 263  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 264  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 265  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 266  */
 267 static u16 __get_link_speed(struct port *port)
 268 {
 269         struct slave *slave = port->slave;
 270         u16 speed;
 271
 272         /* this if covers only a special case: when the configuration starts
 273          * with link down, it sets the speed to 0.
 274          * This is done in spite of the fact that the e100 driver reports 0
 275          * to be compatible with MVT in the future.
 276          */
 277         if (slave->link != BOND_LINK_UP)
 278                 speed = 0;
 279         else {
 280                 switch (slave->speed) {
 281                 case SPEED_10:
 282                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 283                         break;
 284
 285                 case SPEED_100:
 286                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 287                         break;
 288
 289                 case SPEED_1000:
 290                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 291                         break;
 292
 293                 case SPEED_10000:
 294                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 295                         break;
 296
 297                 default:
 298                         /* unknown speed value from ethtool. shouldn't happen */
 299                         speed = 0;
 300                         break;
 301                 }
 302         }
 303
 304         pr_debug("Port %d Received link speed %d update from adapter\n",
 305                  port->actor_port_number, speed);
 306         return speed;
 307 }
 308
 309 /**
 310  * __get_duplex - get a port's duplex
 311  * @port: the port we're looking at
 312  *
 313  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 314  *     0x01 if in full duplex
 315  *     0x00 otherwise
 316  */
 317 static u8 __get_duplex(struct port *port)
 318 {
 319         struct slave *slave = port->slave;
 320
 321         u8 retval;
 322
 323         /* handling a special case: when the configuration starts with
 324          * link down, it sets the duplex to 0.
 325          */
 326         if (slave->link != BOND_LINK_UP)
 327                 retval = 0x0;
 328         else {
 329                 switch (slave->duplex) {
 330                 case DUPLEX_FULL:
 331                         retval = 0x1;
 332                         pr_debug("Port %d Received status full duplex update from adapter\n",
 333                                  port->actor_port_number);
 334                         break;
 335                 case DUPLEX_HALF:
 336                 default:
 337                         retval = 0x0;
 338                         pr_debug("Port %d Received status NOT full duplex update from adapter\n",
 339                                  port->actor_port_number);
 340                         break;
 341                 }
 342         }
 343         return retval;
 344 }
 345
 346 /**
 347  * __initialize_port_locks - initialize a port's STATE machine spinlock
 348  * @port: the slave of the port we're looking at
 349  */
 350 static inline void __initialize_port_locks(struct slave *slave)
 351 {
 352         /* make sure it isn't called twice */
 353         spin_lock_init(&(SLAVE_AD_INFO(slave)->state_machine_lock));
 354 }
 355
 356 /* Conversions */
 357
 358 /**
 359  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 360  * @timer_type: which timer to operate
 361  * @par: timer parameter. see below
 362  *
 363  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 364  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 365  *                                                   %SLOW_PERIODIC_TIME.
 366  */
 367 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 368 {
 369         u16 retval = 0; /* to silence the compiler */
 370
 371         switch (timer_type) {
 372         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 373                 if (par)
 374                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 375                 else
 376                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 377                 break;
 378         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 379                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 380                 break;
 381         case AD_PERIODIC_TIMER:         /* for periodic machine */
 382                 retval = (par*ad_ticks_per_sec); /* long timeout */
 383                 break;
 384         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 385                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 386                 break;
 387         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 388                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 389                 break;
 390         }
 391
 392         return retval;
 393 }
 394
 395
 396 /* ================= ad_rx_machine helper functions ================== */
 397
 398 /**
 399  * __choose_matched - update a port's matched variable from a received lacpdu
 400  * @lacpdu: the lacpdu we've received
 401  * @port: the port we're looking at
 402  *
 403  * Update the value of the matched variable, using parameter values from a
 404  * newly received lacpdu. Parameter values for the partner carried in the
 405  * received PDU are compared with the corresponding operational parameter
 406  * values for the actor. Matched is set to TRUE if all of these parameters
 407  * match and the PDU parameter partner_state.aggregation has the same value as
 408  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 409  * in the aggregation. Matched is also set to TRUE if the value of
 410  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 411  * an individual link and lacp will actively maintain the link. Otherwise,
 412  * matched is set to FALSE. LACP is considered to be actively maintaining the
 413  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 414  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 415  * partner_state.lacp_activity variables are TRUE.
 416  *
 417  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 418  * used here to implement the language from 802.3ad 43.4.9 that requires
 419  * recordPDU to "match" the LACPDU parameters to the stored values.
 420  */
 421 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 422 {
 423         /* check if all parameters are alike
 424          * or this is individual link(aggregation == FALSE)
 425          * then update the state machine Matched variable.
 426          */
 427         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 428              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 429              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 430              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 431              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 432              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 433             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 434                 ) {
 435                 port->sm_vars |= AD_PORT_MATCHED;
 436         } else {
 437                 port->sm_vars &= ~AD_PORT_MATCHED;
 438         }
 439 }
 440
 441 /**
 442  * __record_pdu - record parameters from a received lacpdu
 443  * @lacpdu: the lacpdu we've received
 444  * @port: the port we're looking at
 445  *
 446  * Record the parameter values for the Actor carried in a received lacpdu as
 447  * the current partner operational parameter values and sets
 448  * actor_oper_port_state.defaulted to FALSE.
 449  */
 450 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 451 {
 452         if (lacpdu && port) {
 453                 struct port_params *partner = &port->partner_oper;
 454
 455                 __choose_matched(lacpdu, port);
 456                 /* record the new parameter values for the partner
 457                  * operational
 458                  */
 459                 partner->port_number = ntohs(lacpdu->actor_port);
 460                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 461                 partner->system = lacpdu->actor_system;
 462                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 463                 partner->key = ntohs(lacpdu->actor_key);
 464                 partner->port_state = lacpdu->actor_state;
 465
 466                 /* set actor_oper_port_state.defaulted to FALSE */
 467                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 468
 469                 /* set the partner sync. to on if the partner is sync,
 470                  * and the port is matched
 471                  */
 472                 if ((port->sm_vars & AD_PORT_MATCHED)
 473                     && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
 474                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 475                 else
 476                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 477         }
 478 }
 479
 480 /**
 481  * __record_default - record default parameters
 482  * @port: the port we're looking at
 483  *
 484  * This function records the default parameter values for the partner carried
 485  * in the Partner Admin parameters as the current partner operational parameter
 486  * values and sets actor_oper_port_state.defaulted to TRUE.
 487  */
 488 static void __record_default(struct port *port)
 489 {
 490         if (port) {
 491                 /* record the partner admin parameters */
 492                 memcpy(&port->partner_oper, &port->partner_admin,
 493                        sizeof(struct port_params));
 494
 495                 /* set actor_oper_port_state.defaulted to true */
 496                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 497         }
 498 }
 499
 500 /**
 501  * __update_selected - update a port's Selected variable from a received lacpdu
 502  * @lacpdu: the lacpdu we've received
 503  * @port: the port we're looking at
 504  *
 505  * Update the value of the selected variable, using parameter values from a
 506  * newly received lacpdu. The parameter values for the Actor carried in the
 507  * received PDU are compared with the corresponding operational parameter
 508  * values for the ports partner. If one or more of the comparisons shows that
 509  * the value(s) received in the PDU differ from the current operational values,
 510  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 511  * set to out_of_sync. Otherwise, selected remains unchanged.
 512  */
 513 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 514 {
 515         if (lacpdu && port) {
 516                 const struct port_params *partner = &port->partner_oper;
 517
 518                 /* check if any parameter is different then
 519                  * update the state machine selected variable.
 520                  */
 521                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 522                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 523                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 524                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 525                     ntohs(lacpdu->actor_key) != partner->key ||
 526                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 527                         port->sm_vars &= ~AD_PORT_SELECTED;
 528                 }
 529         }
 530 }
 531
 532 /**
 533  * __update_default_selected - update a port's Selected variable from Partner
 534  * @port: the port we're looking at
 535  *
 536  * This function updates the value of the selected variable, using the partner
 537  * administrative parameter values. The administrative values are compared with
 538  * the corresponding operational parameter values for the partner. If one or
 539  * more of the comparisons shows that the administrative value(s) differ from
 540  * the current operational values, then Selected is set to FALSE and
 541  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 542  * Selected remains unchanged.
 543  */
 544 static void __update_default_selected(struct port *port)
 545 {
 546         if (port) {
 547                 const struct port_params *admin = &port->partner_admin;
 548                 const struct port_params *oper = &port->partner_oper;
 549
 550                 /* check if any parameter is different then
 551                  * update the state machine selected variable.
 552                  */
 553                 if (admin->port_number != oper->port_number ||
 554                     admin->port_priority != oper->port_priority ||
 555                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 556                     admin->system_priority != oper->system_priority ||
 557                     admin->key != oper->key ||
 558                     (admin->port_state & AD_STATE_AGGREGATION)
 559                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 560                         port->sm_vars &= ~AD_PORT_SELECTED;
 561                 }
 562         }
 563 }
 564
 565 /**
 566  * __update_ntt - update a port's ntt variable from a received lacpdu
 567  * @lacpdu: the lacpdu we've received
 568  * @port: the port we're looking at
 569  *
 570  * Updates the value of the ntt variable, using parameter values from a newly
 571  * received lacpdu. The parameter values for the partner carried in the
 572  * received PDU are compared with the corresponding operational parameter
 573  * values for the Actor. If one or more of the comparisons shows that the
 574  * value(s) received in the PDU differ from the current operational values,
 575  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 576  */
 577 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 578 {
 579         /* validate lacpdu and port */
 580         if (lacpdu && port) {
 581                 /* check if any parameter is different then
 582                  * update the port->ntt.
 583                  */
 584                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 585                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 586                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 587                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 588                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 589                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 590                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 591                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 592                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 593                    ) {
 594                         port->ntt = true;
 595                 }
 596         }
 597 }
 598
 599 /**
 600  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 601  * @aggregator: the aggregator we're looking at
 602  *
 603  */
 604 static int __agg_ports_are_ready(struct aggregator *aggregator)
 605 {
 606         struct port *port;
 607         int retval = 1;
 608
 609         if (aggregator) {
 610                 /* scan all ports in this aggregator to verfy if they are
 611                  * all ready.
 612                  */
 613                 for (port = aggregator->lag_ports;
 614                      port;
 615                      port = port->next_port_in_aggregator) {
 616                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 617                                 retval = 0;
 618                                 break;
 619                         }
 620                 }
 621         }
 622
 623         return retval;
 624 }
 625
 626 /**
 627  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 628  * @aggregator: the aggregator we're looking at
 629  * @val: Should the ports' ready bit be set on or off
 630  *
 631  */
 632 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 633 {
 634         struct port *port;
 635
 636         for (port = aggregator->lag_ports; port;
 637              port = port->next_port_in_aggregator) {
 638                 if (val)
 639                         port->sm_vars |= AD_PORT_READY;
 640                 else
 641                         port->sm_vars &= ~AD_PORT_READY;
 642         }
 643 }
 644
 645 /**
 646  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 647  * @aggregator: the aggregator we're looking at
 648  *
 649  */
 650 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 651 {
 652         u32 bandwidth = 0;
 653
 654         if (aggregator->num_of_ports) {
 655                 switch (__get_link_speed(aggregator->lag_ports)) {
 656                 case AD_LINK_SPEED_BITMASK_1MBPS:
 657                         bandwidth = aggregator->num_of_ports;
 658                         break;
 659                 case AD_LINK_SPEED_BITMASK_10MBPS:
 660                         bandwidth = aggregator->num_of_ports * 10;
 661                         break;
 662                 case AD_LINK_SPEED_BITMASK_100MBPS:
 663                         bandwidth = aggregator->num_of_ports * 100;
 664                         break;
 665                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 666                         bandwidth = aggregator->num_of_ports * 1000;
 667                         break;
 668                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 669                         bandwidth = aggregator->num_of_ports * 10000;
 670                         break;
 671                 default:
 672                         bandwidth = 0; /* to silence the compiler */
 673                 }
 674         }
 675         return bandwidth;
 676 }
 677
 678 /**
 679  * __get_active_agg - get the current active aggregator
 680  * @aggregator: the aggregator we're looking at
 681  *
 682  * Caller must hold RCU lock.
 683  */
 684 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 685 {
 686         struct bonding *bond = aggregator->slave->bond;
 687         struct list_head *iter;
 688         struct slave *slave;
 689
 690         bond_for_each_slave_rcu(bond, slave, iter)
 691                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 692                         return &(SLAVE_AD_INFO(slave)->aggregator);
 693
 694         return NULL;
 695 }
 696
 697 /**
 698  * __update_lacpdu_from_port - update a port's lacpdu fields
 699  * @port: the port we're looking at
 700  */
 701 static inline void __update_lacpdu_from_port(struct port *port)
 702 {
 703         struct lacpdu *lacpdu = &port->lacpdu;
 704         const struct port_params *partner = &port->partner_oper;
 705
 706         /* update current actual Actor parameters
 707          * lacpdu->subtype                   initialized
 708          * lacpdu->version_number            initialized
 709          * lacpdu->tlv_type_actor_info       initialized
 710          * lacpdu->actor_information_length  initialized
 711          */
 712
 713         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 714         lacpdu->actor_system = port->actor_system;
 715         lacpdu->actor_key = htons(port->actor_oper_port_key);
 716         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 717         lacpdu->actor_port = htons(port->actor_port_number);
 718         lacpdu->actor_state = port->actor_oper_port_state;
 719
 720         /* lacpdu->reserved_3_1              initialized
 721          * lacpdu->tlv_type_partner_info     initialized
 722          * lacpdu->partner_information_length initialized
 723          */
 724
 725         lacpdu->partner_system_priority = htons(partner->system_priority);
 726         lacpdu->partner_system = partner->system;
 727         lacpdu->partner_key = htons(partner->key);
 728         lacpdu->partner_port_priority = htons(partner->port_priority);
 729         lacpdu->partner_port = htons(partner->port_number);
 730         lacpdu->partner_state = partner->port_state;
 731
 732         /* lacpdu->reserved_3_2              initialized
 733          * lacpdu->tlv_type_collector_info   initialized
 734          * lacpdu->collector_information_length initialized
 735          * collector_max_delay                initialized
 736          * reserved_12[12]                   initialized
 737          * tlv_type_terminator               initialized
 738          * terminator_length                 initialized
 739          * reserved_50[50]                   initialized
 740          */
 741 }
 742
 743 /* ================= main 802.3ad protocol code ========================= */
 744
 745 /**
 746  * ad_lacpdu_send - send out a lacpdu packet on a given port
 747  * @port: the port we're looking at
 748  *
 749  * Returns:   0 on success
 750  *          < 0 on error
 751  */
 752 static int ad_lacpdu_send(struct port *port)
 753 {
 754         struct slave *slave = port->slave;
 755         struct sk_buff *skb;
 756         struct lacpdu_header *lacpdu_header;
 757         int length = sizeof(struct lacpdu_header);
 758
 759         skb = dev_alloc_skb(length);
 760         if (!skb)
 761                 return -ENOMEM;
 762
 763         skb->dev = slave->dev;
 764         skb_reset_mac_header(skb);
 765         skb->network_header = skb->mac_header + ETH_HLEN;
 766         skb->protocol = PKT_TYPE_LACPDU;
 767         skb->priority = TC_PRIO_CONTROL;
 768
 769         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 770
 771         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 772         /* Note: source address is set to be the member's PERMANENT address,
 773          * because we use it to identify loopback lacpdus in receive.
 774          */
 775         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 776         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 777
 778         lacpdu_header->lacpdu = port->lacpdu;
 779
 780         dev_queue_xmit(skb);
 781
 782         return 0;
 783 }
 784
 785 /**
 786  * ad_marker_send - send marker information/response on a given port
 787  * @port: the port we're looking at
 788  * @marker: marker data to send
 789  *
 790  * Returns:   0 on success
 791  *          < 0 on error
 792  */
 793 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 794 {
 795         struct slave *slave = port->slave;
 796         struct sk_buff *skb;
 797         struct bond_marker_header *marker_header;
 798         int length = sizeof(struct bond_marker_header);
 799
 800         skb = dev_alloc_skb(length + 16);
 801         if (!skb)
 802                 return -ENOMEM;
 803
 804         skb_reserve(skb, 16);
 805
 806         skb->dev = slave->dev;
 807         skb_reset_mac_header(skb);
 808         skb->network_header = skb->mac_header + ETH_HLEN;
 809         skb->protocol = PKT_TYPE_LACPDU;
 810
 811         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 812
 813         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 814         /* Note: source address is set to be the member's PERMANENT address,
 815          * because we use it to identify loopback MARKERs in receive.
 816          */
 817         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 818         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 819
 820         marker_header->marker = *marker;
 821
 822         dev_queue_xmit(skb);
 823
 824         return 0;
 825 }
 826
 827 /**
 828  * ad_mux_machine - handle a port's mux state machine
 829  * @port: the port we're looking at
 830  */
 831 static void ad_mux_machine(struct port *port)
 832 {
 833         mux_states_t last_state;
 834
 835         /* keep current State Machine state to compare later if it was
 836          * changed
 837          */
 838         last_state = port->sm_mux_state;
 839
 840         if (port->sm_vars & AD_PORT_BEGIN) {
 841                 port->sm_mux_state = AD_MUX_DETACHED;
 842         } else {
 843                 switch (port->sm_mux_state) {
 844                 case AD_MUX_DETACHED:
 845                         if ((port->sm_vars & AD_PORT_SELECTED)
 846                             || (port->sm_vars & AD_PORT_STANDBY))
 847                                 /* if SELECTED or STANDBY */
 848                                 port->sm_mux_state = AD_MUX_WAITING;
 849                         break;
 850                 case AD_MUX_WAITING:
 851                         /* if SELECTED == FALSE return to DETACH state */
 852                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 853                                 port->sm_vars &= ~AD_PORT_READY_N;
 854                                 /* in order to withhold the Selection Logic to
 855                                  * check all ports READY_N value every callback
 856                                  * cycle to update ready variable, we check
 857                                  * READY_N and update READY here
 858                                  */
 859                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 860                                 port->sm_mux_state = AD_MUX_DETACHED;
 861                                 break;
 862                         }
 863
 864                         /* check if the wait_while_timer expired */
 865                         if (port->sm_mux_timer_counter
 866                             && !(--port->sm_mux_timer_counter))
 867                                 port->sm_vars |= AD_PORT_READY_N;
 868
 869                         /* in order to withhold the selection logic to check
 870                          * all ports READY_N value every callback cycle to
 871                          * update ready variable, we check READY_N and update
 872                          * READY here
 873                          */
 874                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 875
 876                         /* if the wait_while_timer expired, and the port is
 877                          * in READY state, move to ATTACHED state
 878                          */
 879                         if ((port->sm_vars & AD_PORT_READY)
 880                             && !port->sm_mux_timer_counter)
 881                                 port->sm_mux_state = AD_MUX_ATTACHED;
 882                         break;
 883                 case AD_MUX_ATTACHED:
 884                         /* check also if agg_select_timer expired (so the
 885                          * edable port will take place only after this timer)
 886                          */
 887                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 888                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 889                             !__check_agg_selection_timer(port)) {
 890                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;
 891                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 892                                    (port->sm_vars & AD_PORT_STANDBY)) {
 893                                 /* if UNSELECTED or STANDBY */
 894                                 port->sm_vars &= ~AD_PORT_READY_N;
 895                                 /* in order to withhold the selection logic to
 896                                  * check all ports READY_N value every callback
 897                                  * cycle to update ready variable, we check
 898                                  * READY_N and update READY here
 899                                  */
 900                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 901                                 port->sm_mux_state = AD_MUX_DETACHED;
 902                         }
 903                         break;
 904                 case AD_MUX_COLLECTING_DISTRIBUTING:
 905                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
 906                             (port->sm_vars & AD_PORT_STANDBY) ||
 907                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)) {
 908                                 port->sm_mux_state = AD_MUX_ATTACHED;
 909                         } else {
 910                                 /* if port state hasn't changed make
 911                                  * sure that a collecting distributing
 912                                  * port in an active aggregator is enabled
 913                                  */
 914                                 if (port->aggregator &&
 915                                     port->aggregator->is_active &&
 916                                     !__port_is_enabled(port)) {
 917
 918                                         __enable_port(port);
 919                                 }
 920                         }
 921                         break;
 922                 default:
 923                         break;
 924                 }
 925         }
 926
 927         /* check if the state machine was changed */
 928         if (port->sm_mux_state != last_state) {
 929                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
 930                          port->actor_port_number, last_state,
 931                          port->sm_mux_state);
 932                 switch (port->sm_mux_state) {
 933                 case AD_MUX_DETACHED:
 934                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 935                         ad_disable_collecting_distributing(port);
 936                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 937                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 938                         port->ntt = true;
 939                         break;
 940                 case AD_MUX_WAITING:
 941                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 942                         break;
 943                 case AD_MUX_ATTACHED:
 944                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 945                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 946                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 947                         ad_disable_collecting_distributing(port);
 948                         port->ntt = true;
 949                         break;
 950                 case AD_MUX_COLLECTING_DISTRIBUTING:
 951                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 952                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 953                         ad_enable_collecting_distributing(port);
 954                         port->ntt = true;
 955                         break;
 956                 default:
 957                         break;
 958                 }
 959         }
 960 }
 961
 962 /**
 963  * ad_rx_machine - handle a port's rx State Machine
 964  * @lacpdu: the lacpdu we've received
 965  * @port: the port we're looking at
 966  *
 967  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
 968  * CURRENT. If timer expired set the state machine in the proper state.
 969  * In other cases, this function checks if we need to switch to other state.
 970  */
 971 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
 972 {
 973         rx_states_t last_state;
 974
 975         /* keep current State Machine state to compare later if it was
 976          * changed
 977          */
 978         last_state = port->sm_rx_state;
 979
 980         /* check if state machine should change state */
 981
 982         /* first, check if port was reinitialized */
 983         if (port->sm_vars & AD_PORT_BEGIN)
 984                 port->sm_rx_state = AD_RX_INITIALIZE;
 985         /* check if port is not enabled */
 986         else if (!(port->sm_vars & AD_PORT_BEGIN)
 987                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
 988                 port->sm_rx_state = AD_RX_PORT_DISABLED;
 989         /* check if new lacpdu arrived */
 990         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
 991                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
 992                  (port->sm_rx_state == AD_RX_CURRENT))) {
 993                 port->sm_rx_timer_counter = 0;
 994                 port->sm_rx_state = AD_RX_CURRENT;
 995         } else {
 996                 /* if timer is on, and if it is expired */
 997                 if (port->sm_rx_timer_counter &&
 998                     !(--port->sm_rx_timer_counter)) {
 999                         switch (port->sm_rx_state) {
1000                         case AD_RX_EXPIRED:
1001                                 port->sm_rx_state = AD_RX_DEFAULTED;
1002                                 break;
1003                         case AD_RX_CURRENT:
1004                                 port->sm_rx_state = AD_RX_EXPIRED;
1005                                 break;
1006                         default:
1007                                 break;
1008                         }
1009                 } else {
1010                         /* if no lacpdu arrived and no timer is on */
1011                         switch (port->sm_rx_state) {
1012                         case AD_RX_PORT_DISABLED:
1013                                 if (port->sm_vars & AD_PORT_MOVED)
1014                                         port->sm_rx_state = AD_RX_INITIALIZE;
1015                                 else if (port->is_enabled
1016                                          && (port->sm_vars
1017                                              & AD_PORT_LACP_ENABLED))
1018                                         port->sm_rx_state = AD_RX_EXPIRED;
1019                                 else if (port->is_enabled
1020                                          && ((port->sm_vars
1021                                               & AD_PORT_LACP_ENABLED) == 0))
1022                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1023                                 break;
1024                         default:
1025                                 break;
1026
1027                         }
1028                 }
1029         }
1030
1031         /* check if the State machine was changed or new lacpdu arrived */
1032         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1033                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1034                          port->actor_port_number, last_state,
1035                          port->sm_rx_state);
1036                 switch (port->sm_rx_state) {
1037                 case AD_RX_INITIALIZE:
1038                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1039                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1040                         else
1041                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1042                         port->sm_vars &= ~AD_PORT_SELECTED;
1043                         __record_default(port);
1044                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1045                         port->sm_vars &= ~AD_PORT_MOVED;
1046                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1047
1048                         /* Fall Through */
1049                 case AD_RX_PORT_DISABLED:
1050                         port->sm_vars &= ~AD_PORT_MATCHED;
1051                         break;
1052                 case AD_RX_LACP_DISABLED:
1053                         port->sm_vars &= ~AD_PORT_SELECTED;
1054                         __record_default(port);
1055                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1056                         port->sm_vars |= AD_PORT_MATCHED;
1057                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1058                         break;
1059                 case AD_RX_EXPIRED:
1060                         /* Reset of the Synchronization flag (Standard 43.4.12)
1061                          * This reset cause to disable this port in the
1062                          * COLLECTING_DISTRIBUTING state of the mux machine in
1063                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1064                          * the port.
1065                          */
1066                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1067                         port->sm_vars &= ~AD_PORT_MATCHED;
1068                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1069                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1070                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1071                         break;
1072                 case AD_RX_DEFAULTED:
1073                         __update_default_selected(port);
1074                         __record_default(port);
1075                         port->sm_vars |= AD_PORT_MATCHED;
1076                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1077                         break;
1078                 case AD_RX_CURRENT:
1079                         /* detect loopback situation */
1080                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1081                                               &(port->actor_system))) {
1082                                 pr_err("%s: An illegal loopback occurred on adapter (%s)\n"
1083                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1084                                        port->slave->bond->dev->name,
1085                                        port->slave->dev->name);
1086                                 return;
1087                         }
1088                         __update_selected(lacpdu, port);
1089                         __update_ntt(lacpdu, port);
1090                         __record_pdu(lacpdu, port);
1091                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1092                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1093                         break;
1094                 default:
1095                         break;
1096                 }
1097         }
1098 }
1099
1100 /**
1101  * ad_tx_machine - handle a port's tx state machine
1102  * @port: the port we're looking at
1103  */
1104 static void ad_tx_machine(struct port *port)
1105 {
1106         /* check if tx timer expired, to verify that we do not send more than
1107          * 3 packets per second
1108          */
1109         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1110                 /* check if there is something to send */
1111                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1112                         __update_lacpdu_from_port(port);
1113
1114                         if (ad_lacpdu_send(port) >= 0) {
1115                                 pr_debug("Sent LACPDU on port %d\n",
1116                                          port->actor_port_number);
1117
1118                                 /* mark ntt as false, so it will not be sent
1119                                  * again until demanded
1120                                  */
1121                                 port->ntt = false;
1122                         }
1123                 }
1124                 /* restart tx timer(to verify that we will not exceed
1125                  * AD_MAX_TX_IN_SECOND
1126                  */
1127                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1128         }
1129 }
1130
1131 /**
1132  * ad_periodic_machine - handle a port's periodic state machine
1133  * @port: the port we're looking at
1134  *
1135  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1136  */
1137 static void ad_periodic_machine(struct port *port)
1138 {
1139         periodic_states_t last_state;
1140
1141         /* keep current state machine state to compare later if it was changed */
1142         last_state = port->sm_periodic_state;
1143
1144         /* check if port was reinitialized */
1145         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1146             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1147            ) {
1148                 port->sm_periodic_state = AD_NO_PERIODIC;
1149         }
1150         /* check if state machine should change state */
1151         else if (port->sm_periodic_timer_counter) {
1152                 /* check if periodic state machine expired */
1153                 if (!(--port->sm_periodic_timer_counter)) {
1154                         /* if expired then do tx */
1155                         port->sm_periodic_state = AD_PERIODIC_TX;
1156                 } else {
1157                         /* If not expired, check if there is some new timeout
1158                          * parameter from the partner state
1159                          */
1160                         switch (port->sm_periodic_state) {
1161                         case AD_FAST_PERIODIC:
1162                                 if (!(port->partner_oper.port_state
1163                                       & AD_STATE_LACP_TIMEOUT))
1164                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1165                                 break;
1166                         case AD_SLOW_PERIODIC:
1167                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1168                                         port->sm_periodic_timer_counter = 0;
1169                                         port->sm_periodic_state = AD_PERIODIC_TX;
1170                                 }
1171                                 break;
1172                         default:
1173                                 break;
1174                         }
1175                 }
1176         } else {
1177                 switch (port->sm_periodic_state) {
1178                 case AD_NO_PERIODIC:
1179                         port->sm_periodic_state = AD_FAST_PERIODIC;
1180                         break;
1181                 case AD_PERIODIC_TX:
1182                         if (!(port->partner_oper.port_state &
1183                             AD_STATE_LACP_TIMEOUT))
1184                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1185                         else
1186                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1187                         break;
1188                 default:
1189                         break;
1190                 }
1191         }
1192
1193         /* check if the state machine was changed */
1194         if (port->sm_periodic_state != last_state) {
1195                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1196                          port->actor_port_number, last_state,
1197                          port->sm_periodic_state);
1198                 switch (port->sm_periodic_state) {
1199                 case AD_NO_PERIODIC:
1200                         port->sm_periodic_timer_counter = 0;
1201                         break;
1202                 case AD_FAST_PERIODIC:
1203                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1204                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1205                         break;
1206                 case AD_SLOW_PERIODIC:
1207                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1208                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1209                         break;
1210                 case AD_PERIODIC_TX:
1211                         port->ntt = true;
1212                         break;
1213                 default:
1214                         break;
1215                 }
1216         }
1217 }
1218
1219 /**
1220  * ad_port_selection_logic - select aggregation groups
1221  * @port: the port we're looking at
1222  *
1223  * Select aggregation groups, and assign each port for it's aggregetor. The
1224  * selection logic is called in the inititalization (after all the handshkes),
1225  * and after every lacpdu receive (if selected is off).
1226  */
1227 static void ad_port_selection_logic(struct port *port)
1228 {
1229         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1230         struct port *last_port = NULL, *curr_port;
1231         struct list_head *iter;
1232         struct bonding *bond;
1233         struct slave *slave;
1234         int found = 0;
1235
1236         /* if the port is already Selected, do nothing */
1237         if (port->sm_vars & AD_PORT_SELECTED)
1238                 return;
1239
1240         bond = __get_bond_by_port(port);
1241
1242         /* if the port is connected to other aggregator, detach it */
1243         if (port->aggregator) {
1244                 /* detach the port from its former aggregator */
1245                 temp_aggregator = port->aggregator;
1246                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1247                      last_port = curr_port,
1248                      curr_port = curr_port->next_port_in_aggregator) {
1249                         if (curr_port == port) {
1250                                 temp_aggregator->num_of_ports--;
1251                                 /* if it is the first port attached to the
1252                                  * aggregator
1253                                  */
1254                                 if (!last_port) {
1255                                         temp_aggregator->lag_ports =
1256                                                 port->next_port_in_aggregator;
1257                                 } else {
1258                                         /* not the first port attached to the
1259                                          * aggregator
1260                                          */
1261                                         last_port->next_port_in_aggregator =
1262                                                 port->next_port_in_aggregator;
1263                                 }
1264
1265                                 /* clear the port's relations to this
1266                                  * aggregator
1267                                  */
1268                                 port->aggregator = NULL;
1269                                 port->next_port_in_aggregator = NULL;
1270                                 port->actor_port_aggregator_identifier = 0;
1271
1272                                 pr_debug("Port %d left LAG %d\n",
1273                                          port->actor_port_number,
1274                                          temp_aggregator->aggregator_identifier);
1275                                 /* if the aggregator is empty, clear its
1276                                  * parameters, and set it ready to be attached
1277                                  */
1278                                 if (!temp_aggregator->lag_ports)
1279                                         ad_clear_agg(temp_aggregator);
1280                                 break;
1281                         }
1282                 }
1283                 if (!curr_port) {
1284                         /* meaning: the port was related to an aggregator
1285                          * but was not on the aggregator port list
1286                          */
1287                         pr_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1288                                             port->slave->bond->dev->name,
1289                                             port->actor_port_number,
1290                                             port->slave->dev->name,
1291                                             port->aggregator->aggregator_identifier);
1292                 }
1293         }
1294         /* search on all aggregators for a suitable aggregator for this port */
1295         bond_for_each_slave(bond, slave, iter) {
1296                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1297
1298                 /* keep a free aggregator for later use(if needed) */
1299                 if (!aggregator->lag_ports) {
1300                         if (!free_aggregator)
1301                                 free_aggregator = aggregator;
1302                         continue;
1303                 }
1304                 /* check if current aggregator suits us */
1305                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1306                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1307                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1308                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1309                     ) &&
1310                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1311                       !aggregator->is_individual)  /* but is not individual OR */
1312                     )
1313                    ) {
1314                         /* attach to the founded aggregator */
1315                         port->aggregator = aggregator;
1316                         port->actor_port_aggregator_identifier =
1317                                 port->aggregator->aggregator_identifier;
1318                         port->next_port_in_aggregator = aggregator->lag_ports;
1319                         port->aggregator->num_of_ports++;
1320                         aggregator->lag_ports = port;
1321                         pr_debug("Port %d joined LAG %d(existing LAG)\n",
1322                                  port->actor_port_number,
1323                                  port->aggregator->aggregator_identifier);
1324
1325                         /* mark this port as selected */
1326                         port->sm_vars |= AD_PORT_SELECTED;
1327                         found = 1;
1328                         break;
1329                 }
1330         }
1331
1332         /* the port couldn't find an aggregator - attach it to a new
1333          * aggregator
1334          */
1335         if (!found) {
1336                 if (free_aggregator) {
1337                         /* assign port a new aggregator */
1338                         port->aggregator = free_aggregator;
1339                         port->actor_port_aggregator_identifier =
1340                                 port->aggregator->aggregator_identifier;
1341
1342                         /* update the new aggregator's parameters
1343                          * if port was responsed from the end-user
1344                          */
1345                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1346                                 /* if port is full duplex */
1347                                 port->aggregator->is_individual = false;
1348                         else
1349                                 port->aggregator->is_individual = true;
1350
1351                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1352                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1353                         port->aggregator->partner_system =
1354                                 port->partner_oper.system;
1355                         port->aggregator->partner_system_priority =
1356                                 port->partner_oper.system_priority;
1357                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1358                         port->aggregator->receive_state = 1;
1359                         port->aggregator->transmit_state = 1;
1360                         port->aggregator->lag_ports = port;
1361                         port->aggregator->num_of_ports++;
1362
1363                         /* mark this port as selected */
1364                         port->sm_vars |= AD_PORT_SELECTED;
1365
1366                         pr_debug("Port %d joined LAG %d(new LAG)\n",
1367                                  port->actor_port_number,
1368                                  port->aggregator->aggregator_identifier);
1369                 } else {
1370                         pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1371                                port->slave->bond->dev->name,
1372                                port->actor_port_number, port->slave->dev->name);
1373                 }
1374         }
1375         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1376          * in all aggregator's ports, else set ready=FALSE in all
1377          * aggregator's ports
1378          */
1379         __set_agg_ports_ready(port->aggregator,
1380                               __agg_ports_are_ready(port->aggregator));
1381
1382         aggregator = __get_first_agg(port);
1383         ad_agg_selection_logic(aggregator);
1384 }
1385
1386 /* Decide if "agg" is a better choice for the new active aggregator that
1387  * the current best, according to the ad_select policy.
1388  */
1389 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1390                                                 struct aggregator *curr)
1391 {
1392         /* 0. If no best, select current.
1393          *
1394          * 1. If the current agg is not individual, and the best is
1395          *    individual, select current.
1396          *
1397          * 2. If current agg is individual and the best is not, keep best.
1398          *
1399          * 3. Therefore, current and best are both individual or both not
1400          *    individual, so:
1401          *
1402          * 3a. If current agg partner replied, and best agg partner did not,
1403          *     select current.
1404          *
1405          * 3b. If current agg partner did not reply and best agg partner
1406          *     did reply, keep best.
1407          *
1408          * 4.  Therefore, current and best both have partner replies or
1409          *     both do not, so perform selection policy:
1410          *
1411          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1412          *     select by bandwidth.
1413          *
1414          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1415          */
1416         if (!best)
1417                 return curr;
1418
1419         if (!curr->is_individual && best->is_individual)
1420                 return curr;
1421
1422         if (curr->is_individual && !best->is_individual)
1423                 return best;
1424
1425         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1426                 return curr;
1427
1428         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1429                 return best;
1430
1431         switch (__get_agg_selection_mode(curr->lag_ports)) {
1432         case BOND_AD_COUNT:
1433                 if (curr->num_of_ports > best->num_of_ports)
1434                         return curr;
1435
1436                 if (curr->num_of_ports < best->num_of_ports)
1437                         return best;
1438
1439                 /*FALLTHROUGH*/
1440         case BOND_AD_STABLE:
1441         case BOND_AD_BANDWIDTH:
1442                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1443                         return curr;
1444
1445                 break;
1446
1447         default:
1448                 pr_warn_ratelimited("%s: Impossible agg select mode %d\n",
1449                                     curr->slave->bond->dev->name,
1450                                     __get_agg_selection_mode(curr->lag_ports));
1451                 break;
1452         }
1453
1454         return best;
1455 }
1456
1457 static int agg_device_up(const struct aggregator *agg)
1458 {
1459         struct port *port = agg->lag_ports;
1460
1461         if (!port)
1462                 return 0;
1463
1464         return netif_running(port->slave->dev) &&
1465                netif_carrier_ok(port->slave->dev);
1466 }
1467
1468 /**
1469  * ad_agg_selection_logic - select an aggregation group for a team
1470  * @aggregator: the aggregator we're looking at
1471  *
1472  * It is assumed that only one aggregator may be selected for a team.
1473  *
1474  * The logic of this function is to select the aggregator according to
1475  * the ad_select policy:
1476  *
1477  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1478  * it, and to reselect the active aggregator only if the previous
1479  * aggregator has no more ports related to it.
1480  *
1481  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1482  * bandwidth, and reselect whenever a link state change takes place or the
1483  * set of slaves in the bond changes.
1484  *
1485  * BOND_AD_COUNT: select the aggregator with largest number of ports
1486  * (slaves), and reselect whenever a link state change takes place or the
1487  * set of slaves in the bond changes.
1488  *
1489  * FIXME: this function MUST be called with the first agg in the bond, or
1490  * __get_active_agg() won't work correctly. This function should be better
1491  * called with the bond itself, and retrieve the first agg from it.
1492  */
1493 static void ad_agg_selection_logic(struct aggregator *agg)
1494 {
1495         struct aggregator *best, *active, *origin;
1496         struct bonding *bond = agg->slave->bond;
1497         struct list_head *iter;
1498         struct slave *slave;
1499         struct port *port;
1500
1501         rcu_read_lock();
1502         origin = agg;
1503         active = __get_active_agg(agg);
1504         best = (active && agg_device_up(active)) ? active : NULL;
1505
1506         bond_for_each_slave_rcu(bond, slave, iter) {
1507                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1508
1509                 agg->is_active = 0;
1510
1511                 if (agg->num_of_ports && agg_device_up(agg))
1512                         best = ad_agg_selection_test(best, agg);
1513         }
1514
1515         if (best &&
1516             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1517                 /* For the STABLE policy, don't replace the old active
1518                  * aggregator if it's still active (it has an answering
1519                  * partner) or if both the best and active don't have an
1520                  * answering partner.
1521                  */
1522                 if (active && active->lag_ports &&
1523                     active->lag_ports->is_enabled &&
1524                     (__agg_has_partner(active) ||
1525                      (!__agg_has_partner(active) &&
1526                      !__agg_has_partner(best)))) {
1527                         if (!(!active->actor_oper_aggregator_key &&
1528                               best->actor_oper_aggregator_key)) {
1529                                 best = NULL;
1530                                 active->is_active = 1;
1531                         }
1532                 }
1533         }
1534
1535         if (best && (best == active)) {
1536                 best = NULL;
1537                 active->is_active = 1;
1538         }
1539
1540         /* if there is new best aggregator, activate it */
1541         if (best) {
1542                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1543                          best->aggregator_identifier, best->num_of_ports,
1544                          best->actor_oper_aggregator_key,
1545                          best->partner_oper_aggregator_key,
1546                          best->is_individual, best->is_active);
1547                 pr_debug("best ports %p slave %p %s\n",
1548                          best->lag_ports, best->slave,
1549                          best->slave ? best->slave->dev->name : "NULL");
1550
1551                 bond_for_each_slave_rcu(bond, slave, iter) {
1552                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1553
1554                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1555                                  agg->aggregator_identifier, agg->num_of_ports,
1556                                  agg->actor_oper_aggregator_key,
1557                                  agg->partner_oper_aggregator_key,
1558                                  agg->is_individual, agg->is_active);
1559                 }
1560
1561                 /* check if any partner replys */
1562                 if (best->is_individual) {
1563                         pr_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1564                                             best->slave ?
1565                                             best->slave->bond->dev->name : "NULL");
1566                 }
1567
1568                 best->is_active = 1;
1569                 pr_debug("LAG %d chosen as the active LAG\n",
1570                          best->aggregator_identifier);
1571                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1572                          best->aggregator_identifier, best->num_of_ports,
1573                          best->actor_oper_aggregator_key,
1574                          best->partner_oper_aggregator_key,
1575                          best->is_individual, best->is_active);
1576
1577                 /* disable the ports that were related to the former
1578                  * active_aggregator
1579                  */
1580                 if (active) {
1581                         for (port = active->lag_ports; port;
1582                              port = port->next_port_in_aggregator) {
1583                                 __disable_port(port);
1584                         }
1585                 }
1586         }
1587
1588         /* if the selected aggregator is of join individuals
1589          * (partner_system is NULL), enable their ports
1590          */
1591         active = __get_active_agg(origin);
1592
1593         if (active) {
1594                 if (!__agg_has_partner(active)) {
1595                         for (port = active->lag_ports; port;
1596                              port = port->next_port_in_aggregator) {
1597                                 __enable_port(port);
1598                         }
1599                 }
1600         }
1601
1602         rcu_read_unlock();
1603
1604         bond_3ad_set_carrier(bond);
1605 }
1606
1607 /**
1608  * ad_clear_agg - clear a given aggregator's parameters
1609  * @aggregator: the aggregator we're looking at
1610  */
1611 static void ad_clear_agg(struct aggregator *aggregator)
1612 {
1613         if (aggregator) {
1614                 aggregator->is_individual = false;
1615                 aggregator->actor_admin_aggregator_key = 0;
1616                 aggregator->actor_oper_aggregator_key = 0;
1617                 aggregator->partner_system = null_mac_addr;
1618                 aggregator->partner_system_priority = 0;
1619                 aggregator->partner_oper_aggregator_key = 0;
1620                 aggregator->receive_state = 0;
1621                 aggregator->transmit_state = 0;
1622                 aggregator->lag_ports = NULL;
1623                 aggregator->is_active = 0;
1624                 aggregator->num_of_ports = 0;
1625                 pr_debug("LAG %d was cleared\n",
1626                          aggregator->aggregator_identifier);
1627         }
1628 }
1629
1630 /**
1631  * ad_initialize_agg - initialize a given aggregator's parameters
1632  * @aggregator: the aggregator we're looking at
1633  */
1634 static void ad_initialize_agg(struct aggregator *aggregator)
1635 {
1636         if (aggregator) {
1637                 ad_clear_agg(aggregator);
1638
1639                 aggregator->aggregator_mac_address = null_mac_addr;
1640                 aggregator->aggregator_identifier = 0;
1641                 aggregator->slave = NULL;
1642         }
1643 }
1644
1645 /**
1646  * ad_initialize_port - initialize a given port's parameters
1647  * @aggregator: the aggregator we're looking at
1648  * @lacp_fast: boolean. whether fast periodic should be used
1649  */
1650 static void ad_initialize_port(struct port *port, int lacp_fast)
1651 {
1652         static const struct port_params tmpl = {
1653                 .system_priority = 0xffff,
1654                 .key             = 1,
1655                 .port_number     = 1,
1656                 .port_priority   = 0xff,
1657                 .port_state      = 1,
1658         };
1659         static const struct lacpdu lacpdu = {
1660                 .subtype                = 0x01,
1661                 .version_number = 0x01,
1662                 .tlv_type_actor_info = 0x01,
1663                 .actor_information_length = 0x14,
1664                 .tlv_type_partner_info = 0x02,
1665                 .partner_information_length = 0x14,
1666                 .tlv_type_collector_info = 0x03,
1667                 .collector_information_length = 0x10,
1668                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1669         };
1670
1671         if (port) {
1672                 port->actor_port_number = 1;
1673                 port->actor_port_priority = 0xff;
1674                 port->actor_system = null_mac_addr;
1675                 port->actor_system_priority = 0xffff;
1676                 port->actor_port_aggregator_identifier = 0;
1677                 port->ntt = false;
1678                 port->actor_admin_port_key = 1;
1679                 port->actor_oper_port_key  = 1;
1680                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1681                                                AD_STATE_LACP_ACTIVITY;
1682                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1683                                                AD_STATE_LACP_ACTIVITY;
1684
1685                 if (lacp_fast)
1686                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1687
1688                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1689                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1690
1691                 port->is_enabled = true;
1692                 /* private parameters */
1693                 port->sm_vars = 0x3;
1694                 port->sm_rx_state = 0;
1695                 port->sm_rx_timer_counter = 0;
1696                 port->sm_periodic_state = 0;
1697                 port->sm_periodic_timer_counter = 0;
1698                 port->sm_mux_state = 0;
1699                 port->sm_mux_timer_counter = 0;
1700                 port->sm_tx_state = 0;
1701                 port->sm_tx_timer_counter = 0;
1702                 port->slave = NULL;
1703                 port->aggregator = NULL;
1704                 port->next_port_in_aggregator = NULL;
1705                 port->transaction_id = 0;
1706
1707                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1708         }
1709 }
1710
1711 /**
1712  * ad_enable_collecting_distributing - enable a port's transmit/receive
1713  * @port: the port we're looking at
1714  *
1715  * Enable @port if it's in an active aggregator
1716  */
1717 static void ad_enable_collecting_distributing(struct port *port)
1718 {
1719         if (port->aggregator->is_active) {
1720                 pr_debug("Enabling port %d(LAG %d)\n",
1721                          port->actor_port_number,
1722                          port->aggregator->aggregator_identifier);
1723                 __enable_port(port);
1724         }
1725 }
1726
1727 /**
1728  * ad_disable_collecting_distributing - disable a port's transmit/receive
1729  * @port: the port we're looking at
1730  */
1731 static void ad_disable_collecting_distributing(struct port *port)
1732 {
1733         if (port->aggregator &&
1734             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1735                                &(null_mac_addr))) {
1736                 pr_debug("Disabling port %d(LAG %d)\n",
1737                          port->actor_port_number,
1738                          port->aggregator->aggregator_identifier);
1739                 __disable_port(port);
1740         }
1741 }
1742
1743 /**
1744  * ad_marker_info_received - handle receive of a Marker information frame
1745  * @marker_info: Marker info received
1746  * @port: the port we're looking at
1747  */
1748 static void ad_marker_info_received(struct bond_marker *marker_info,
1749         struct port *port)
1750 {
1751         struct bond_marker marker;
1752
1753         /* copy the received marker data to the response marker */
1754         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1755         /* change the marker subtype to marker response */
1756         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1757
1758         /* send the marker response */
1759         if (ad_marker_send(port, &marker) >= 0) {
1760                 pr_debug("Sent Marker Response on port %d\n",
1761                          port->actor_port_number);
1762         }
1763 }
1764
1765 /**
1766  * ad_marker_response_received - handle receive of a marker response frame
1767  * @marker: marker PDU received
1768  * @port: the port we're looking at
1769  *
1770  * This function does nothing since we decided not to implement send and handle
1771  * response for marker PDU's, in this stage, but only to respond to marker
1772  * information.
1773  */
1774 static void ad_marker_response_received(struct bond_marker *marker,
1775                                         struct port *port)
1776 {
1777         marker = NULL;
1778         port = NULL;
1779         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1780 }
1781
1782 /* ========= AD exported functions to the main bonding code ========= */
1783
1784 /* Check aggregators status in team every T seconds */
1785 #define AD_AGGREGATOR_SELECTION_TIMER  8
1786
1787 /**
1788  * bond_3ad_initiate_agg_selection - initate aggregator selection
1789  * @bond: bonding struct
1790  *
1791  * Set the aggregation selection timer, to initiate an agg selection in
1792  * the very near future.  Called during first initialization, and during
1793  * any down to up transitions of the bond.
1794  */
1795 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1796 {
1797         BOND_AD_INFO(bond).agg_select_timer = timeout;
1798 }
1799
1800 /**
1801  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1802  * @bond: bonding struct to work on
1803  * @tick_resolution: tick duration (millisecond resolution)
1804  *
1805  * Can be called only after the mac address of the bond is set.
1806  */
1807 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1808 {
1809         /* check that the bond is not initialized yet */
1810         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1811                                 bond->dev->dev_addr)) {
1812
1813                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1814
1815                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1816                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1817
1818                 /* initialize how many times this module is called in one
1819                  * second (should be about every 100ms)
1820                  */
1821                 ad_ticks_per_sec = tick_resolution;
1822
1823                 bond_3ad_initiate_agg_selection(bond,
1824                                                 AD_AGGREGATOR_SELECTION_TIMER *
1825                                                 ad_ticks_per_sec);
1826         }
1827 }
1828
1829 /**
1830  * bond_3ad_bind_slave - initialize a slave's port
1831  * @slave: slave struct to work on
1832  *
1833  * Returns:   0 on success
1834  *          < 0 on error
1835  */
1836 void bond_3ad_bind_slave(struct slave *slave)
1837 {
1838         struct bonding *bond = bond_get_bond_by_slave(slave);
1839         struct port *port;
1840         struct aggregator *aggregator;
1841
1842         /* check that the slave has not been initialized yet. */
1843         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1844
1845                 /* port initialization */
1846                 port = &(SLAVE_AD_INFO(slave)->port);
1847
1848                 ad_initialize_port(port, bond->params.lacp_fast);
1849
1850                 __initialize_port_locks(slave);
1851                 port->slave = slave;
1852                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
1853                 /* key is determined according to the link speed, duplex and user key(which
1854                  * is yet not supported)
1855                  */
1856                 port->actor_admin_port_key = 0;
1857                 port->actor_admin_port_key |= __get_duplex(port);
1858                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1859                 port->actor_oper_port_key = port->actor_admin_port_key;
1860                 /* if the port is not full duplex, then the port should be not
1861                  * lacp Enabled
1862                  */
1863                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1864                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1865                 /* actor system is the bond's system */
1866                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1867                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1868                  * lacpdu's are sent in one second)
1869                  */
1870                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1871                 port->aggregator = NULL;
1872                 port->next_port_in_aggregator = NULL;
1873
1874                 __disable_port(port);
1875
1876                 /* aggregator initialization */
1877                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1878
1879                 ad_initialize_agg(aggregator);
1880
1881                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1882                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1883                 aggregator->slave = slave;
1884                 aggregator->is_active = 0;
1885                 aggregator->num_of_ports = 0;
1886         }
1887 }
1888
1889 /**
1890  * bond_3ad_unbind_slave - deinitialize a slave's port
1891  * @slave: slave struct to work on
1892  *
1893  * Search for the aggregator that is related to this port, remove the
1894  * aggregator and assign another aggregator for other port related to it
1895  * (if any), and remove the port.
1896  */
1897 void bond_3ad_unbind_slave(struct slave *slave)
1898 {
1899         struct port *port, *prev_port, *temp_port;
1900         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1901         int select_new_active_agg = 0;
1902         struct bonding *bond = slave->bond;
1903         struct slave *slave_iter;
1904         struct list_head *iter;
1905
1906         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1907         port = &(SLAVE_AD_INFO(slave)->port);
1908
1909         /* if slave is null, the whole port is not initialized */
1910         if (!port->slave) {
1911                 pr_warn("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1912                         slave->bond->dev->name, slave->dev->name);
1913                 return;
1914         }
1915
1916         pr_debug("Unbinding Link Aggregation Group %d\n",
1917                  aggregator->aggregator_identifier);
1918
1919         /* Tell the partner that this port is not suitable for aggregation */
1920         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1921         __update_lacpdu_from_port(port);
1922         ad_lacpdu_send(port);
1923
1924         /* check if this aggregator is occupied */
1925         if (aggregator->lag_ports) {
1926                 /* check if there are other ports related to this aggregator
1927                  * except the port related to this slave(thats ensure us that
1928                  * there is a reason to search for new aggregator, and that we
1929                  * will find one
1930                  */
1931                 if ((aggregator->lag_ports != port) ||
1932                     (aggregator->lag_ports->next_port_in_aggregator)) {
1933                         /* find new aggregator for the related port(s) */
1934                         bond_for_each_slave(bond, slave_iter, iter) {
1935                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
1936                                 /* if the new aggregator is empty, or it is
1937                                  * connected to our port only
1938                                  */
1939                                 if (!new_aggregator->lag_ports ||
1940                                     ((new_aggregator->lag_ports == port) &&
1941                                      !new_aggregator->lag_ports->next_port_in_aggregator))
1942                                         break;
1943                         }
1944                         if (!slave_iter)
1945                                 new_aggregator = NULL;
1946
1947                         /* if new aggregator found, copy the aggregator's
1948                          * parameters and connect the related lag_ports to the
1949                          * new aggregator
1950                          */
1951                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1952                                 pr_debug("Some port(s) related to LAG %d - replacing with LAG %d\n",
1953                                          aggregator->aggregator_identifier,
1954                                          new_aggregator->aggregator_identifier);
1955
1956                                 if ((new_aggregator->lag_ports == port) &&
1957                                     new_aggregator->is_active) {
1958                                         pr_info("%s: Removing an active aggregator\n",
1959                                                 aggregator->slave->bond->dev->name);
1960                                          select_new_active_agg = 1;
1961                                 }
1962
1963                                 new_aggregator->is_individual = aggregator->is_individual;
1964                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1965                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1966                                 new_aggregator->partner_system = aggregator->partner_system;
1967                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1968                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1969                                 new_aggregator->receive_state = aggregator->receive_state;
1970                                 new_aggregator->transmit_state = aggregator->transmit_state;
1971                                 new_aggregator->lag_ports = aggregator->lag_ports;
1972                                 new_aggregator->is_active = aggregator->is_active;
1973                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
1974
1975                                 /* update the information that is written on
1976                                  * the ports about the aggregator
1977                                  */
1978                                 for (temp_port = aggregator->lag_ports; temp_port;
1979                                      temp_port = temp_port->next_port_in_aggregator) {
1980                                         temp_port->aggregator = new_aggregator;
1981                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1982                                 }
1983
1984                                 ad_clear_agg(aggregator);
1985
1986                                 if (select_new_active_agg)
1987                                         ad_agg_selection_logic(__get_first_agg(port));
1988                         } else {
1989                                 pr_warn("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
1990                                         slave->bond->dev->name);
1991                         }
1992                 } else {
1993                         /* in case that the only port related to this
1994                          * aggregator is the one we want to remove
1995                          */
1996                         select_new_active_agg = aggregator->is_active;
1997                         ad_clear_agg(aggregator);
1998                         if (select_new_active_agg) {
1999                                 pr_info("%s: Removing an active aggregator\n",
2000                                         slave->bond->dev->name);
2001                                 /* select new active aggregator */
2002                                 temp_aggregator = __get_first_agg(port);
2003                                 if (temp_aggregator)
2004                                         ad_agg_selection_logic(temp_aggregator);
2005                         }
2006                 }
2007         }
2008
2009         pr_debug("Unbinding port %d\n", port->actor_port_number);
2010
2011         /* find the aggregator that this port is connected to */
2012         bond_for_each_slave(bond, slave_iter, iter) {
2013                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2014                 prev_port = NULL;
2015                 /* search the port in the aggregator's related ports */
2016                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2017                      prev_port = temp_port,
2018                      temp_port = temp_port->next_port_in_aggregator) {
2019                         if (temp_port == port) {
2020                                 /* the aggregator found - detach the port from
2021                                  * this aggregator
2022                                  */
2023                                 if (prev_port)
2024                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2025                                 else
2026                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2027                                 temp_aggregator->num_of_ports--;
2028                                 if (temp_aggregator->num_of_ports == 0) {
2029                                         select_new_active_agg = temp_aggregator->is_active;
2030                                         ad_clear_agg(temp_aggregator);
2031                                         if (select_new_active_agg) {
2032                                                 pr_info("%s: Removing an active aggregator\n",
2033                                                         slave->bond->dev->name);
2034                                                 /* select new active aggregator */
2035                                                 ad_agg_selection_logic(__get_first_agg(port));
2036                                         }
2037                                 }
2038                                 break;
2039                         }
2040                 }
2041         }
2042         port->slave = NULL;
2043 }
2044
2045 /**
2046  * bond_3ad_state_machine_handler - handle state machines timeout
2047  * @bond: bonding struct to work on
2048  *
2049  * The state machine handling concept in this module is to check every tick
2050  * which state machine should operate any function. The execution order is
2051  * round robin, so when we have an interaction between state machines, the
2052  * reply of one to each other might be delayed until next tick.
2053  *
2054  * This function also complete the initialization when the agg_select_timer
2055  * times out, and it selects an aggregator for the ports that are yet not
2056  * related to any aggregator, and selects the active aggregator for a bond.
2057  */
2058 void bond_3ad_state_machine_handler(struct work_struct *work)
2059 {
2060         struct bonding *bond = container_of(work, struct bonding,
2061                                             ad_work.work);
2062         struct aggregator *aggregator;
2063         struct list_head *iter;
2064         struct slave *slave;
2065         struct port *port;
2066         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2067
2068         read_lock(&bond->lock);
2069         rcu_read_lock();
2070
2071         /* check if there are any slaves */
2072         if (!bond_has_slaves(bond))
2073                 goto re_arm;
2074
2075         /* check if agg_select_timer timer after initialize is timed out */
2076         if (BOND_AD_INFO(bond).agg_select_timer &&
2077             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2078                 slave = bond_first_slave_rcu(bond);
2079                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2080
2081                 /* select the active aggregator for the bond */
2082                 if (port) {
2083                         if (!port->slave) {
2084                                 pr_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2085                                                     bond->dev->name);
2086                                 goto re_arm;
2087                         }
2088
2089                         aggregator = __get_first_agg(port);
2090                         ad_agg_selection_logic(aggregator);
2091                 }
2092                 bond_3ad_set_carrier(bond);
2093         }
2094
2095         /* for each port run the state machines */
2096         bond_for_each_slave_rcu(bond, slave, iter) {
2097                 port = &(SLAVE_AD_INFO(slave)->port);
2098                 if (!port->slave) {
2099                         pr_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2100                                             bond->dev->name);
2101                         goto re_arm;
2102                 }
2103
2104                 /* Lock around state machines to protect data accessed
2105                  * by all (e.g., port->sm_vars).  ad_rx_machine may run
2106                  * concurrently due to incoming LACPDU.
2107                  */
2108                 __get_state_machine_lock(port);
2109
2110                 ad_rx_machine(NULL, port);
2111                 ad_periodic_machine(port);
2112                 ad_port_selection_logic(port);
2113                 ad_mux_machine(port);
2114                 ad_tx_machine(port);
2115
2116                 /* turn off the BEGIN bit, since we already handled it */
2117                 if (port->sm_vars & AD_PORT_BEGIN)
2118                         port->sm_vars &= ~AD_PORT_BEGIN;
2119
2120                 __release_state_machine_lock(port);
2121         }
2122
2123 re_arm:
2124         bond_for_each_slave_rcu(bond, slave, iter) {
2125                 if (slave->should_notify) {
2126                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2127                         break;
2128                 }
2129         }
2130         rcu_read_unlock();
2131         read_unlock(&bond->lock);
2132
2133         if (should_notify_rtnl && rtnl_trylock()) {
2134                 bond_slave_state_notify(bond);
2135                 rtnl_unlock();
2136         }
2137         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2138 }
2139
2140 /**
2141  * bond_3ad_rx_indication - handle a received frame
2142  * @lacpdu: received lacpdu
2143  * @slave: slave struct to work on
2144  * @length: length of the data received
2145  *
2146  * It is assumed that frames that were sent on this NIC don't returned as new
2147  * received frames (loopback). Since only the payload is given to this
2148  * function, it check for loopback.
2149  */
2150 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2151                                   u16 length)
2152 {
2153         struct port *port;
2154         int ret = RX_HANDLER_ANOTHER;
2155
2156         if (length >= sizeof(struct lacpdu)) {
2157
2158                 port = &(SLAVE_AD_INFO(slave)->port);
2159
2160                 if (!port->slave) {
2161                         pr_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2162                                             slave->dev->name, slave->bond->dev->name);
2163                         return ret;
2164                 }
2165
2166                 switch (lacpdu->subtype) {
2167                 case AD_TYPE_LACPDU:
2168                         ret = RX_HANDLER_CONSUMED;
2169                         pr_debug("Received LACPDU on port %d\n",
2170                                  port->actor_port_number);
2171                         /* Protect against concurrent state machines */
2172                         __get_state_machine_lock(port);
2173                         ad_rx_machine(lacpdu, port);
2174                         __release_state_machine_lock(port);
2175                         break;
2176
2177                 case AD_TYPE_MARKER:
2178                         ret = RX_HANDLER_CONSUMED;
2179                         /* No need to convert fields to Little Endian since we
2180                          * don't use the marker's fields.
2181                          */
2182
2183                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2184                         case AD_MARKER_INFORMATION_SUBTYPE:
2185                                 pr_debug("Received Marker Information on port %d\n",
2186                                          port->actor_port_number);
2187                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2188                                 break;
2189
2190                         case AD_MARKER_RESPONSE_SUBTYPE:
2191                                 pr_debug("Received Marker Response on port %d\n",
2192                                          port->actor_port_number);
2193                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2194                                 break;
2195
2196                         default:
2197                                 pr_debug("Received an unknown Marker subtype on slot %d\n",
2198                                          port->actor_port_number);
2199                         }
2200                 }
2201         }
2202         return ret;
2203 }
2204
2205 /**
2206  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2207  * @slave: slave struct to work on
2208  *
2209  * Handle reselection of aggregator (if needed) for this port.
2210  */
2211 void bond_3ad_adapter_speed_changed(struct slave *slave)
2212 {
2213         struct port *port;
2214
2215         port = &(SLAVE_AD_INFO(slave)->port);
2216
2217         /* if slave is null, the whole port is not initialized */
2218         if (!port->slave) {
2219                 pr_warn("Warning: %s: speed changed for uninitialized port on %s\n",
2220                         slave->bond->dev->name, slave->dev->name);
2221                 return;
2222         }
2223
2224         __get_state_machine_lock(port);
2225
2226         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2227         port->actor_oper_port_key = port->actor_admin_port_key |=
2228                 (__get_link_speed(port) << 1);
2229         pr_debug("Port %d changed speed\n", port->actor_port_number);
2230         /* there is no need to reselect a new aggregator, just signal the
2231          * state machines to reinitialize
2232          */
2233         port->sm_vars |= AD_PORT_BEGIN;
2234
2235         __release_state_machine_lock(port);
2236 }
2237
2238 /**
2239  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2240  * @slave: slave struct to work on
2241  *
2242  * Handle reselection of aggregator (if needed) for this port.
2243  */
2244 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2245 {
2246         struct port *port;
2247
2248         port = &(SLAVE_AD_INFO(slave)->port);
2249
2250         /* if slave is null, the whole port is not initialized */
2251         if (!port->slave) {
2252                 pr_warn("%s: Warning: duplex changed for uninitialized port on %s\n",
2253                         slave->bond->dev->name, slave->dev->name);
2254                 return;
2255         }
2256
2257         __get_state_machine_lock(port);
2258
2259         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2260         port->actor_oper_port_key = port->actor_admin_port_key |=
2261                 __get_duplex(port);
2262         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2263         /* there is no need to reselect a new aggregator, just signal the
2264          * state machines to reinitialize
2265          */
2266         port->sm_vars |= AD_PORT_BEGIN;
2267
2268         __release_state_machine_lock(port);
2269 }
2270
2271 /**
2272  * bond_3ad_handle_link_change - handle a slave's link status change indication
2273  * @slave: slave struct to work on
2274  * @status: whether the link is now up or down
2275  *
2276  * Handle reselection of aggregator (if needed) for this port.
2277  */
2278 void bond_3ad_handle_link_change(struct slave *slave, char link)
2279 {
2280         struct port *port;
2281
2282         port = &(SLAVE_AD_INFO(slave)->port);
2283
2284         /* if slave is null, the whole port is not initialized */
2285         if (!port->slave) {
2286                 pr_warn("Warning: %s: link status changed for uninitialized port on %s\n",
2287                         slave->bond->dev->name, slave->dev->name);
2288                 return;
2289         }
2290
2291         __get_state_machine_lock(port);
2292         /* on link down we are zeroing duplex and speed since
2293          * some of the adaptors(ce1000.lan) report full duplex/speed
2294          * instead of N/A(duplex) / 0(speed).
2295          *
2296          * on link up we are forcing recheck on the duplex and speed since
2297          * some of he adaptors(ce1000.lan) report.
2298          */
2299         if (link == BOND_LINK_UP) {
2300                 port->is_enabled = true;
2301                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2302                 port->actor_oper_port_key = port->actor_admin_port_key |=
2303                         __get_duplex(port);
2304                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2305                 port->actor_oper_port_key = port->actor_admin_port_key |=
2306                         (__get_link_speed(port) << 1);
2307         } else {
2308                 /* link has failed */
2309                 port->is_enabled = false;
2310                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2311                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2312                                              ~AD_SPEED_KEY_BITS);
2313         }
2314         pr_debug("Port %d changed link status to %s\n",
2315                  port->actor_port_number,
2316                  link == BOND_LINK_UP ? "UP" : "DOWN");
2317         /* there is no need to reselect a new aggregator, just signal the
2318          * state machines to reinitialize
2319          */
2320         port->sm_vars |= AD_PORT_BEGIN;
2321
2322         __release_state_machine_lock(port);
2323 }
2324
2325 /**
2326  * bond_3ad_set_carrier - set link state for bonding master
2327  * @bond - bonding structure
2328  *
2329  * if we have an active aggregator, we're up, if not, we're down.
2330  * Presumes that we cannot have an active aggregator if there are
2331  * no slaves with link up.
2332  *
2333  * This behavior complies with IEEE 802.3 section 43.3.9.
2334  *
2335  * Called by bond_set_carrier(). Return zero if carrier state does not
2336  * change, nonzero if it does.
2337  */
2338 int bond_3ad_set_carrier(struct bonding *bond)
2339 {
2340         struct aggregator *active;
2341         struct slave *first_slave;
2342         int ret = 1;
2343
2344         rcu_read_lock();
2345         first_slave = bond_first_slave_rcu(bond);
2346         if (!first_slave) {
2347                 ret = 0;
2348                 goto out;
2349         }
2350         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2351         if (active) {
2352                 /* are enough slaves available to consider link up? */
2353                 if (active->num_of_ports < bond->params.min_links) {
2354                         if (netif_carrier_ok(bond->dev)) {
2355                                 netif_carrier_off(bond->dev);
2356                                 goto out;
2357                         }
2358                 } else if (!netif_carrier_ok(bond->dev)) {
2359                         netif_carrier_on(bond->dev);
2360                         goto out;
2361                 }
2362         } else if (netif_carrier_ok(bond->dev)) {
2363                 netif_carrier_off(bond->dev);
2364         }
2365 out:
2366         rcu_read_unlock();
2367         return ret;
2368 }
2369
2370 /**
2371  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2372  * @bond: bonding struct to work on
2373  * @ad_info: ad_info struct to fill with the bond's info
2374  *
2375  * Returns:   0 on success
2376  *          < 0 on error
2377  */
2378 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2379                                    struct ad_info *ad_info)
2380 {
2381         struct aggregator *aggregator = NULL;
2382         struct list_head *iter;
2383         struct slave *slave;
2384         struct port *port;
2385
2386         bond_for_each_slave_rcu(bond, slave, iter) {
2387                 port = &(SLAVE_AD_INFO(slave)->port);
2388                 if (port->aggregator && port->aggregator->is_active) {
2389                         aggregator = port->aggregator;
2390                         break;
2391                 }
2392         }
2393
2394         if (!aggregator)
2395                 return -1;
2396
2397         ad_info->aggregator_id = aggregator->aggregator_identifier;
2398         ad_info->ports = aggregator->num_of_ports;
2399         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2400         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2401         ether_addr_copy(ad_info->partner_system,
2402                         aggregator->partner_system.mac_addr_value);
2403         return 0;
2404 }
2405
2406 /* Wrapper used to hold bond->lock so no slave manipulation can occur */
2407 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2408 {
2409         int ret;
2410
2411         rcu_read_lock();
2412         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2413         rcu_read_unlock();
2414
2415         return ret;
2416 }
2417
2418 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2419 {
2420         struct bonding *bond = netdev_priv(dev);
2421         struct slave *slave, *first_ok_slave;
2422         struct aggregator *agg;
2423         struct ad_info ad_info;
2424         struct list_head *iter;
2425         int slaves_in_agg;
2426         int slave_agg_no;
2427         int agg_id;
2428
2429         if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2430                 pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
2431                          dev->name);
2432                 goto err_free;
2433         }
2434
2435         slaves_in_agg = ad_info.ports;
2436         agg_id = ad_info.aggregator_id;
2437
2438         if (slaves_in_agg == 0) {
2439                 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2440                 goto err_free;
2441         }
2442
2443         slave_agg_no = bond_xmit_hash(bond, skb) % slaves_in_agg;
2444         first_ok_slave = NULL;
2445
2446         bond_for_each_slave_rcu(bond, slave, iter) {
2447                 agg = SLAVE_AD_INFO(slave)->port.aggregator;
2448                 if (!agg || agg->aggregator_identifier != agg_id)
2449                         continue;
2450
2451                 if (slave_agg_no >= 0) {
2452                         if (!first_ok_slave && bond_slave_can_tx(slave))
2453                                 first_ok_slave = slave;
2454                         slave_agg_no--;
2455                         continue;
2456                 }
2457
2458                 if (bond_slave_can_tx(slave)) {
2459                         bond_dev_queue_xmit(bond, skb, slave->dev);
2460                         goto out;
2461                 }
2462         }
2463
2464         if (slave_agg_no >= 0) {
2465                 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2466                        dev->name, agg_id);
2467                 goto err_free;
2468         }
2469
2470         /* we couldn't find any suitable slave after the agg_no, so use the
2471          * first suitable found, if found.
2472          */
2473         if (first_ok_slave)
2474                 bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2475         else
2476                 goto err_free;
2477
2478 out:
2479         return NETDEV_TX_OK;
2480 err_free:
2481         /* no suitable interface, frame not sent */
2482         dev_kfree_skb_any(skb);
2483         goto out;
2484 }
2485
2486 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2487                          struct slave *slave)
2488 {
2489         int ret = RX_HANDLER_ANOTHER;
2490         struct lacpdu *lacpdu, _lacpdu;
2491
2492         if (skb->protocol != PKT_TYPE_LACPDU)
2493                 return ret;
2494
2495         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2496         if (!lacpdu)
2497                 return ret;
2498
2499         read_lock(&bond->lock);
2500         ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
2501         read_unlock(&bond->lock);
2502         return ret;
2503 }
2504
2505 /**
2506  * bond_3ad_update_lacp_rate - change the lacp rate
2507  * @bond - bonding struct
2508  *
2509  * When modify lacp_rate parameter via sysfs,
2510  * update actor_oper_port_state of each port.
2511  *
2512  * Hold slave->state_machine_lock,
2513  * so we can modify port->actor_oper_port_state,
2514  * no matter bond is up or down.
2515  */
2516 void bond_3ad_update_lacp_rate(struct bonding *bond)
2517 {
2518         struct port *port = NULL;
2519         struct list_head *iter;
2520         struct slave *slave;
2521         int lacp_fast;
2522
2523         lacp_fast = bond->params.lacp_fast;
2524         bond_for_each_slave(bond, slave, iter) {
2525                 port = &(SLAVE_AD_INFO(slave)->port);
2526                 __get_state_machine_lock(port);
2527                 if (lacp_fast)
2528                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2529                 else
2530                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2531                 __release_state_machine_lock(port);
2532         }
2533 }