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) && IS_UP(slave->dev))
 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         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 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         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 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         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 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         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 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).\nCheck the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1083                                        port->slave->bond->dev->name,
1084                                        port->slave->dev->name);
1085                                 return;
1086                         }
1087                         __update_selected(lacpdu, port);
1088                         __update_ntt(lacpdu, port);
1089                         __record_pdu(lacpdu, port);
1090                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1091                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1092                         break;
1093                 default:
1094                         break;
1095                 }
1096         }
1097 }
1098
1099 /**
1100  * ad_tx_machine - handle a port's tx state machine
1101  * @port: the port we're looking at
1102  */
1103 static void ad_tx_machine(struct port *port)
1104 {
1105         /* check if tx timer expired, to verify that we do not send more than
1106          * 3 packets per second
1107          */
1108         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1109                 /* check if there is something to send */
1110                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1111                         __update_lacpdu_from_port(port);
1112
1113                         if (ad_lacpdu_send(port) >= 0) {
1114                                 pr_debug("Sent LACPDU on port %d\n",
1115                                          port->actor_port_number);
1116
1117                                 /* mark ntt as false, so it will not be sent
1118                                  * again until demanded
1119                                  */
1120                                 port->ntt = false;
1121                         }
1122                 }
1123                 /* restart tx timer(to verify that we will not exceed
1124                  * AD_MAX_TX_IN_SECOND
1125                  */
1126                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1127         }
1128 }
1129
1130 /**
1131  * ad_periodic_machine - handle a port's periodic state machine
1132  * @port: the port we're looking at
1133  *
1134  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1135  */
1136 static void ad_periodic_machine(struct port *port)
1137 {
1138         periodic_states_t last_state;
1139
1140         /* keep current state machine state to compare later if it was changed */
1141         last_state = port->sm_periodic_state;
1142
1143         /* check if port was reinitialized */
1144         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1145             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1146            ) {
1147                 port->sm_periodic_state = AD_NO_PERIODIC;
1148         }
1149         /* check if state machine should change state */
1150         else if (port->sm_periodic_timer_counter) {
1151                 /* check if periodic state machine expired */
1152                 if (!(--port->sm_periodic_timer_counter)) {
1153                         /* if expired then do tx */
1154                         port->sm_periodic_state = AD_PERIODIC_TX;
1155                 } else {
1156                         /* If not expired, check if there is some new timeout
1157                          * parameter from the partner state
1158                          */
1159                         switch (port->sm_periodic_state) {
1160                         case AD_FAST_PERIODIC:
1161                                 if (!(port->partner_oper.port_state
1162                                       & AD_STATE_LACP_TIMEOUT))
1163                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1164                                 break;
1165                         case AD_SLOW_PERIODIC:
1166                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1167                                         port->sm_periodic_timer_counter = 0;
1168                                         port->sm_periodic_state = AD_PERIODIC_TX;
1169                                 }
1170                                 break;
1171                         default:
1172                                 break;
1173                         }
1174                 }
1175         } else {
1176                 switch (port->sm_periodic_state) {
1177                 case AD_NO_PERIODIC:
1178                         port->sm_periodic_state = AD_FAST_PERIODIC;
1179                         break;
1180                 case AD_PERIODIC_TX:
1181                         if (!(port->partner_oper.port_state &
1182                             AD_STATE_LACP_TIMEOUT))
1183                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1184                         else
1185                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1186                         break;
1187                 default:
1188                         break;
1189                 }
1190         }
1191
1192         /* check if the state machine was changed */
1193         if (port->sm_periodic_state != last_state) {
1194                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1195                          port->actor_port_number, last_state,
1196                          port->sm_periodic_state);
1197                 switch (port->sm_periodic_state) {
1198                 case AD_NO_PERIODIC:
1199                         port->sm_periodic_timer_counter = 0;
1200                         break;
1201                 case AD_FAST_PERIODIC:
1202                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1203                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1204                         break;
1205                 case AD_SLOW_PERIODIC:
1206                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1207                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1208                         break;
1209                 case AD_PERIODIC_TX:
1210                         port->ntt = true;
1211                         break;
1212                 default:
1213                         break;
1214                 }
1215         }
1216 }
1217
1218 /**
1219  * ad_port_selection_logic - select aggregation groups
1220  * @port: the port we're looking at
1221  *
1222  * Select aggregation groups, and assign each port for it's aggregetor. The
1223  * selection logic is called in the inititalization (after all the handshkes),
1224  * and after every lacpdu receive (if selected is off).
1225  */
1226 static void ad_port_selection_logic(struct port *port)
1227 {
1228         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1229         struct port *last_port = NULL, *curr_port;
1230         struct list_head *iter;
1231         struct bonding *bond;
1232         struct slave *slave;
1233         int found = 0;
1234
1235         /* if the port is already Selected, do nothing */
1236         if (port->sm_vars & AD_PORT_SELECTED)
1237                 return;
1238
1239         bond = __get_bond_by_port(port);
1240
1241         /* if the port is connected to other aggregator, detach it */
1242         if (port->aggregator) {
1243                 /* detach the port from its former aggregator */
1244                 temp_aggregator = port->aggregator;
1245                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1246                      last_port = curr_port,
1247                      curr_port = curr_port->next_port_in_aggregator) {
1248                         if (curr_port == port) {
1249                                 temp_aggregator->num_of_ports--;
1250                                 /* if it is the first port attached to the
1251                                  * aggregator
1252                                  */
1253                                 if (!last_port) {
1254                                         temp_aggregator->lag_ports =
1255                                                 port->next_port_in_aggregator;
1256                                 } else {
1257                                         /* not the first port attached to the
1258                                          * aggregator
1259                                          */
1260                                         last_port->next_port_in_aggregator =
1261                                                 port->next_port_in_aggregator;
1262                                 }
1263
1264                                 /* clear the port's relations to this
1265                                  * aggregator
1266                                  */
1267                                 port->aggregator = NULL;
1268                                 port->next_port_in_aggregator = NULL;
1269                                 port->actor_port_aggregator_identifier = 0;
1270
1271                                 pr_debug("Port %d left LAG %d\n",
1272                                          port->actor_port_number,
1273                                          temp_aggregator->aggregator_identifier);
1274                                 /* if the aggregator is empty, clear its
1275                                  * parameters, and set it ready to be attached
1276                                  */
1277                                 if (!temp_aggregator->lag_ports)
1278                                         ad_clear_agg(temp_aggregator);
1279                                 break;
1280                         }
1281                 }
1282                 if (!curr_port) {
1283                         /* meaning: the port was related to an aggregator
1284                          * but was not on the aggregator port list
1285                          */
1286                         pr_warn("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1287                                 port->slave->bond->dev->name,
1288                                 port->actor_port_number,
1289                                 port->slave->dev->name,
1290                                 port->aggregator->aggregator_identifier);
1291                 }
1292         }
1293         /* search on all aggregators for a suitable aggregator for this port */
1294         bond_for_each_slave(bond, slave, iter) {
1295                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1296
1297                 /* keep a free aggregator for later use(if needed) */
1298                 if (!aggregator->lag_ports) {
1299                         if (!free_aggregator)
1300                                 free_aggregator = aggregator;
1301                         continue;
1302                 }
1303                 /* check if current aggregator suits us */
1304                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1305                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1306                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1307                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1308                     ) &&
1309                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1310                       !aggregator->is_individual)  /* but is not individual OR */
1311                     )
1312                    ) {
1313                         /* attach to the founded aggregator */
1314                         port->aggregator = aggregator;
1315                         port->actor_port_aggregator_identifier =
1316                                 port->aggregator->aggregator_identifier;
1317                         port->next_port_in_aggregator = aggregator->lag_ports;
1318                         port->aggregator->num_of_ports++;
1319                         aggregator->lag_ports = port;
1320                         pr_debug("Port %d joined LAG %d(existing LAG)\n",
1321                                  port->actor_port_number,
1322                                  port->aggregator->aggregator_identifier);
1323
1324                         /* mark this port as selected */
1325                         port->sm_vars |= AD_PORT_SELECTED;
1326                         found = 1;
1327                         break;
1328                 }
1329         }
1330
1331         /* the port couldn't find an aggregator - attach it to a new
1332          * aggregator
1333          */
1334         if (!found) {
1335                 if (free_aggregator) {
1336                         /* assign port a new aggregator */
1337                         port->aggregator = free_aggregator;
1338                         port->actor_port_aggregator_identifier =
1339                                 port->aggregator->aggregator_identifier;
1340
1341                         /* update the new aggregator's parameters
1342                          * if port was responsed from the end-user
1343                          */
1344                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1345                                 /* if port is full duplex */
1346                                 port->aggregator->is_individual = false;
1347                         else
1348                                 port->aggregator->is_individual = true;
1349
1350                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1351                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1352                         port->aggregator->partner_system =
1353                                 port->partner_oper.system;
1354                         port->aggregator->partner_system_priority =
1355                                 port->partner_oper.system_priority;
1356                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1357                         port->aggregator->receive_state = 1;
1358                         port->aggregator->transmit_state = 1;
1359                         port->aggregator->lag_ports = port;
1360                         port->aggregator->num_of_ports++;
1361
1362                         /* mark this port as selected */
1363                         port->sm_vars |= AD_PORT_SELECTED;
1364
1365                         pr_debug("Port %d joined LAG %d(new LAG)\n",
1366                                  port->actor_port_number,
1367                                  port->aggregator->aggregator_identifier);
1368                 } else {
1369                         pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1370                                port->slave->bond->dev->name,
1371                                port->actor_port_number, port->slave->dev->name);
1372                 }
1373         }
1374         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1375          * in all aggregator's ports, else set ready=FALSE in all
1376          * aggregator's ports
1377          */
1378         __set_agg_ports_ready(port->aggregator,
1379                               __agg_ports_are_ready(port->aggregator));
1380
1381         aggregator = __get_first_agg(port);
1382         ad_agg_selection_logic(aggregator);
1383 }
1384
1385 /* Decide if "agg" is a better choice for the new active aggregator that
1386  * the current best, according to the ad_select policy.
1387  */
1388 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1389                                                 struct aggregator *curr)
1390 {
1391         /* 0. If no best, select current.
1392          *
1393          * 1. If the current agg is not individual, and the best is
1394          *    individual, select current.
1395          *
1396          * 2. If current agg is individual and the best is not, keep best.
1397          *
1398          * 3. Therefore, current and best are both individual or both not
1399          *    individual, so:
1400          *
1401          * 3a. If current agg partner replied, and best agg partner did not,
1402          *     select current.
1403          *
1404          * 3b. If current agg partner did not reply and best agg partner
1405          *     did reply, keep best.
1406          *
1407          * 4.  Therefore, current and best both have partner replies or
1408          *     both do not, so perform selection policy:
1409          *
1410          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1411          *     select by bandwidth.
1412          *
1413          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1414          */
1415         if (!best)
1416                 return curr;
1417
1418         if (!curr->is_individual && best->is_individual)
1419                 return curr;
1420
1421         if (curr->is_individual && !best->is_individual)
1422                 return best;
1423
1424         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1425                 return curr;
1426
1427         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1428                 return best;
1429
1430         switch (__get_agg_selection_mode(curr->lag_ports)) {
1431         case BOND_AD_COUNT:
1432                 if (curr->num_of_ports > best->num_of_ports)
1433                         return curr;
1434
1435                 if (curr->num_of_ports < best->num_of_ports)
1436                         return best;
1437
1438                 /*FALLTHROUGH*/
1439         case BOND_AD_STABLE:
1440         case BOND_AD_BANDWIDTH:
1441                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1442                         return curr;
1443
1444                 break;
1445
1446         default:
1447                 pr_warn("%s: Impossible agg select mode %d\n",
1448                         curr->slave->bond->dev->name,
1449                         __get_agg_selection_mode(curr->lag_ports));
1450                 break;
1451         }
1452
1453         return best;
1454 }
1455
1456 static int agg_device_up(const struct aggregator *agg)
1457 {
1458         struct port *port = agg->lag_ports;
1459
1460         if (!port)
1461                 return 0;
1462
1463         return netif_running(port->slave->dev) &&
1464                netif_carrier_ok(port->slave->dev);
1465 }
1466
1467 /**
1468  * ad_agg_selection_logic - select an aggregation group for a team
1469  * @aggregator: the aggregator we're looking at
1470  *
1471  * It is assumed that only one aggregator may be selected for a team.
1472  *
1473  * The logic of this function is to select the aggregator according to
1474  * the ad_select policy:
1475  *
1476  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1477  * it, and to reselect the active aggregator only if the previous
1478  * aggregator has no more ports related to it.
1479  *
1480  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1481  * bandwidth, and reselect whenever a link state change takes place or the
1482  * set of slaves in the bond changes.
1483  *
1484  * BOND_AD_COUNT: select the aggregator with largest number of ports
1485  * (slaves), and reselect whenever a link state change takes place or the
1486  * set of slaves in the bond changes.
1487  *
1488  * FIXME: this function MUST be called with the first agg in the bond, or
1489  * __get_active_agg() won't work correctly. This function should be better
1490  * called with the bond itself, and retrieve the first agg from it.
1491  */
1492 static void ad_agg_selection_logic(struct aggregator *agg)
1493 {
1494         struct aggregator *best, *active, *origin;
1495         struct bonding *bond = agg->slave->bond;
1496         struct list_head *iter;
1497         struct slave *slave;
1498         struct port *port;
1499
1500         rcu_read_lock();
1501         origin = agg;
1502         active = __get_active_agg(agg);
1503         best = (active && agg_device_up(active)) ? active : NULL;
1504
1505         bond_for_each_slave_rcu(bond, slave, iter) {
1506                 agg = &(SLAVE_AD_INFO(slave).aggregator);
1507
1508                 agg->is_active = 0;
1509
1510                 if (agg->num_of_ports && agg_device_up(agg))
1511                         best = ad_agg_selection_test(best, agg);
1512         }
1513
1514         if (best &&
1515             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1516                 /* For the STABLE policy, don't replace the old active
1517                  * aggregator if it's still active (it has an answering
1518                  * partner) or if both the best and active don't have an
1519                  * answering partner.
1520                  */
1521                 if (active && active->lag_ports &&
1522                     active->lag_ports->is_enabled &&
1523                     (__agg_has_partner(active) ||
1524                      (!__agg_has_partner(active) &&
1525                      !__agg_has_partner(best)))) {
1526                         if (!(!active->actor_oper_aggregator_key &&
1527                               best->actor_oper_aggregator_key)) {
1528                                 best = NULL;
1529                                 active->is_active = 1;
1530                         }
1531                 }
1532         }
1533
1534         if (best && (best == active)) {
1535                 best = NULL;
1536                 active->is_active = 1;
1537         }
1538
1539         /* if there is new best aggregator, activate it */
1540         if (best) {
1541                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1542                          best->aggregator_identifier, best->num_of_ports,
1543                          best->actor_oper_aggregator_key,
1544                          best->partner_oper_aggregator_key,
1545                          best->is_individual, best->is_active);
1546                 pr_debug("best ports %p slave %p %s\n",
1547                          best->lag_ports, best->slave,
1548                          best->slave ? best->slave->dev->name : "NULL");
1549
1550                 bond_for_each_slave_rcu(bond, slave, iter) {
1551                         agg = &(SLAVE_AD_INFO(slave).aggregator);
1552
1553                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1554                                  agg->aggregator_identifier, agg->num_of_ports,
1555                                  agg->actor_oper_aggregator_key,
1556                                  agg->partner_oper_aggregator_key,
1557                                  agg->is_individual, agg->is_active);
1558                 }
1559
1560                 /* check if any partner replys */
1561                 if (best->is_individual) {
1562                         pr_warn("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1563                                 best->slave ?
1564                                 best->slave->bond->dev->name : "NULL");
1565                 }
1566
1567                 best->is_active = 1;
1568                 pr_debug("LAG %d chosen as the active LAG\n",
1569                          best->aggregator_identifier);
1570                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1571                          best->aggregator_identifier, best->num_of_ports,
1572                          best->actor_oper_aggregator_key,
1573                          best->partner_oper_aggregator_key,
1574                          best->is_individual, best->is_active);
1575
1576                 /* disable the ports that were related to the former
1577                  * active_aggregator
1578                  */
1579                 if (active) {
1580                         for (port = active->lag_ports; port;
1581                              port = port->next_port_in_aggregator) {
1582                                 __disable_port(port);
1583                         }
1584                 }
1585         }
1586
1587         /* if the selected aggregator is of join individuals
1588          * (partner_system is NULL), enable their ports
1589          */
1590         active = __get_active_agg(origin);
1591
1592         if (active) {
1593                 if (!__agg_has_partner(active)) {
1594                         for (port = active->lag_ports; port;
1595                              port = port->next_port_in_aggregator) {
1596                                 __enable_port(port);
1597                         }
1598                 }
1599         }
1600
1601         rcu_read_unlock();
1602
1603         bond_3ad_set_carrier(bond);
1604 }
1605
1606 /**
1607  * ad_clear_agg - clear a given aggregator's parameters
1608  * @aggregator: the aggregator we're looking at
1609  */
1610 static void ad_clear_agg(struct aggregator *aggregator)
1611 {
1612         if (aggregator) {
1613                 aggregator->is_individual = false;
1614                 aggregator->actor_admin_aggregator_key = 0;
1615                 aggregator->actor_oper_aggregator_key = 0;
1616                 aggregator->partner_system = null_mac_addr;
1617                 aggregator->partner_system_priority = 0;
1618                 aggregator->partner_oper_aggregator_key = 0;
1619                 aggregator->receive_state = 0;
1620                 aggregator->transmit_state = 0;
1621                 aggregator->lag_ports = NULL;
1622                 aggregator->is_active = 0;
1623                 aggregator->num_of_ports = 0;
1624                 pr_debug("LAG %d was cleared\n",
1625                          aggregator->aggregator_identifier);
1626         }
1627 }
1628
1629 /**
1630  * ad_initialize_agg - initialize a given aggregator's parameters
1631  * @aggregator: the aggregator we're looking at
1632  */
1633 static void ad_initialize_agg(struct aggregator *aggregator)
1634 {
1635         if (aggregator) {
1636                 ad_clear_agg(aggregator);
1637
1638                 aggregator->aggregator_mac_address = null_mac_addr;
1639                 aggregator->aggregator_identifier = 0;
1640                 aggregator->slave = NULL;
1641         }
1642 }
1643
1644 /**
1645  * ad_initialize_port - initialize a given port's parameters
1646  * @aggregator: the aggregator we're looking at
1647  * @lacp_fast: boolean. whether fast periodic should be used
1648  */
1649 static void ad_initialize_port(struct port *port, int lacp_fast)
1650 {
1651         static const struct port_params tmpl = {
1652                 .system_priority = 0xffff,
1653                 .key             = 1,
1654                 .port_number     = 1,
1655                 .port_priority   = 0xff,
1656                 .port_state      = 1,
1657         };
1658         static const struct lacpdu lacpdu = {
1659                 .subtype                = 0x01,
1660                 .version_number = 0x01,
1661                 .tlv_type_actor_info = 0x01,
1662                 .actor_information_length = 0x14,
1663                 .tlv_type_partner_info = 0x02,
1664                 .partner_information_length = 0x14,
1665                 .tlv_type_collector_info = 0x03,
1666                 .collector_information_length = 0x10,
1667                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1668         };
1669
1670         if (port) {
1671                 port->actor_port_number = 1;
1672                 port->actor_port_priority = 0xff;
1673                 port->actor_system = null_mac_addr;
1674                 port->actor_system_priority = 0xffff;
1675                 port->actor_port_aggregator_identifier = 0;
1676                 port->ntt = false;
1677                 port->actor_admin_port_key = 1;
1678                 port->actor_oper_port_key  = 1;
1679                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1680                                                AD_STATE_LACP_ACTIVITY;
1681                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1682                                                AD_STATE_LACP_ACTIVITY;
1683
1684                 if (lacp_fast)
1685                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1686
1687                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1688                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1689
1690                 port->is_enabled = true;
1691                 /* private parameters */
1692                 port->sm_vars = 0x3;
1693                 port->sm_rx_state = 0;
1694                 port->sm_rx_timer_counter = 0;
1695                 port->sm_periodic_state = 0;
1696                 port->sm_periodic_timer_counter = 0;
1697                 port->sm_mux_state = 0;
1698                 port->sm_mux_timer_counter = 0;
1699                 port->sm_tx_state = 0;
1700                 port->sm_tx_timer_counter = 0;
1701                 port->slave = NULL;
1702                 port->aggregator = NULL;
1703                 port->next_port_in_aggregator = NULL;
1704                 port->transaction_id = 0;
1705
1706                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1707         }
1708 }
1709
1710 /**
1711  * ad_enable_collecting_distributing - enable a port's transmit/receive
1712  * @port: the port we're looking at
1713  *
1714  * Enable @port if it's in an active aggregator
1715  */
1716 static void ad_enable_collecting_distributing(struct port *port)
1717 {
1718         if (port->aggregator->is_active) {
1719                 pr_debug("Enabling port %d(LAG %d)\n",
1720                          port->actor_port_number,
1721                          port->aggregator->aggregator_identifier);
1722                 __enable_port(port);
1723         }
1724 }
1725
1726 /**
1727  * ad_disable_collecting_distributing - disable a port's transmit/receive
1728  * @port: the port we're looking at
1729  */
1730 static void ad_disable_collecting_distributing(struct port *port)
1731 {
1732         if (port->aggregator &&
1733             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1734                                &(null_mac_addr))) {
1735                 pr_debug("Disabling port %d(LAG %d)\n",
1736                          port->actor_port_number,
1737                          port->aggregator->aggregator_identifier);
1738                 __disable_port(port);
1739         }
1740 }
1741
1742 /**
1743  * ad_marker_info_received - handle receive of a Marker information frame
1744  * @marker_info: Marker info received
1745  * @port: the port we're looking at
1746  */
1747 static void ad_marker_info_received(struct bond_marker *marker_info,
1748         struct port *port)
1749 {
1750         struct bond_marker marker;
1751
1752         /* copy the received marker data to the response marker */
1753         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1754         /* change the marker subtype to marker response */
1755         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1756
1757         /* send the marker response */
1758         if (ad_marker_send(port, &marker) >= 0) {
1759                 pr_debug("Sent Marker Response on port %d\n",
1760                          port->actor_port_number);
1761         }
1762 }
1763
1764 /**
1765  * ad_marker_response_received - handle receive of a marker response frame
1766  * @marker: marker PDU received
1767  * @port: the port we're looking at
1768  *
1769  * This function does nothing since we decided not to implement send and handle
1770  * response for marker PDU's, in this stage, but only to respond to marker
1771  * information.
1772  */
1773 static void ad_marker_response_received(struct bond_marker *marker,
1774                                         struct port *port)
1775 {
1776         marker = NULL;
1777         port = NULL;
1778         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1779 }
1780
1781 /* ========= AD exported functions to the main bonding code ========= */
1782
1783 /* Check aggregators status in team every T seconds */
1784 #define AD_AGGREGATOR_SELECTION_TIMER  8
1785
1786 /**
1787  * bond_3ad_initiate_agg_selection - initate aggregator selection
1788  * @bond: bonding struct
1789  *
1790  * Set the aggregation selection timer, to initiate an agg selection in
1791  * the very near future.  Called during first initialization, and during
1792  * any down to up transitions of the bond.
1793  */
1794 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1795 {
1796         BOND_AD_INFO(bond).agg_select_timer = timeout;
1797 }
1798
1799 /**
1800  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1801  * @bond: bonding struct to work on
1802  * @tick_resolution: tick duration (millisecond resolution)
1803  *
1804  * Can be called only after the mac address of the bond is set.
1805  */
1806 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1807 {
1808         /* check that the bond is not initialized yet */
1809         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1810                                 bond->dev->dev_addr)) {
1811
1812                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1813
1814                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1815                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1816
1817                 /* initialize how many times this module is called in one
1818                  * second (should be about every 100ms)
1819                  */
1820                 ad_ticks_per_sec = tick_resolution;
1821
1822                 bond_3ad_initiate_agg_selection(bond,
1823                                                 AD_AGGREGATOR_SELECTION_TIMER *
1824                                                 ad_ticks_per_sec);
1825         }
1826 }
1827
1828 /**
1829  * bond_3ad_bind_slave - initialize a slave's port
1830  * @slave: slave struct to work on
1831  *
1832  * Returns:   0 on success
1833  *          < 0 on error
1834  */
1835 void bond_3ad_bind_slave(struct slave *slave)
1836 {
1837         struct bonding *bond = bond_get_bond_by_slave(slave);
1838         struct port *port;
1839         struct aggregator *aggregator;
1840
1841         /* check that the slave has not been initialized yet. */
1842         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1843
1844                 /* port initialization */
1845                 port = &(SLAVE_AD_INFO(slave).port);
1846
1847                 ad_initialize_port(port, bond->params.lacp_fast);
1848
1849                 __initialize_port_locks(slave);
1850                 port->slave = slave;
1851                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1852                 /* key is determined according to the link speed, duplex and user key(which
1853                  * is yet not supported)
1854                  */
1855                 port->actor_admin_port_key = 0;
1856                 port->actor_admin_port_key |= __get_duplex(port);
1857                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1858                 port->actor_oper_port_key = port->actor_admin_port_key;
1859                 /* if the port is not full duplex, then the port should be not
1860                  * lacp Enabled
1861                  */
1862                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1863                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1864                 /* actor system is the bond's system */
1865                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1866                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1867                  * lacpdu's are sent in one second)
1868                  */
1869                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1870                 port->aggregator = NULL;
1871                 port->next_port_in_aggregator = NULL;
1872
1873                 __disable_port(port);
1874
1875                 /* aggregator initialization */
1876                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1877
1878                 ad_initialize_agg(aggregator);
1879
1880                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1881                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1882                 aggregator->slave = slave;
1883                 aggregator->is_active = 0;
1884                 aggregator->num_of_ports = 0;
1885         }
1886 }
1887
1888 /**
1889  * bond_3ad_unbind_slave - deinitialize a slave's port
1890  * @slave: slave struct to work on
1891  *
1892  * Search for the aggregator that is related to this port, remove the
1893  * aggregator and assign another aggregator for other port related to it
1894  * (if any), and remove the port.
1895  */
1896 void bond_3ad_unbind_slave(struct slave *slave)
1897 {
1898         struct port *port, *prev_port, *temp_port;
1899         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1900         int select_new_active_agg = 0;
1901         struct bonding *bond = slave->bond;
1902         struct slave *slave_iter;
1903         struct list_head *iter;
1904
1905         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1906         port = &(SLAVE_AD_INFO(slave).port);
1907
1908         /* if slave is null, the whole port is not initialized */
1909         if (!port->slave) {
1910                 pr_warn("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1911                         slave->bond->dev->name, slave->dev->name);
1912                 return;
1913         }
1914
1915         pr_debug("Unbinding Link Aggregation Group %d\n",
1916                  aggregator->aggregator_identifier);
1917
1918         /* Tell the partner that this port is not suitable for aggregation */
1919         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1920         __update_lacpdu_from_port(port);
1921         ad_lacpdu_send(port);
1922
1923         /* check if this aggregator is occupied */
1924         if (aggregator->lag_ports) {
1925                 /* check if there are other ports related to this aggregator
1926                  * except the port related to this slave(thats ensure us that
1927                  * there is a reason to search for new aggregator, and that we
1928                  * will find one
1929                  */
1930                 if ((aggregator->lag_ports != port) ||
1931                     (aggregator->lag_ports->next_port_in_aggregator)) {
1932                         /* find new aggregator for the related port(s) */
1933                         bond_for_each_slave(bond, slave_iter, iter) {
1934                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
1935                                 /* if the new aggregator is empty, or it is
1936                                  * connected to our port only
1937                                  */
1938                                 if (!new_aggregator->lag_ports ||
1939                                     ((new_aggregator->lag_ports == port) &&
1940                                      !new_aggregator->lag_ports->next_port_in_aggregator))
1941                                         break;
1942                         }
1943                         if (!slave_iter)
1944                                 new_aggregator = NULL;
1945
1946                         /* if new aggregator found, copy the aggregator's
1947                          * parameters and connect the related lag_ports to the
1948                          * new aggregator
1949                          */
1950                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1951                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
1952                                          aggregator->aggregator_identifier,
1953                                          new_aggregator->aggregator_identifier);
1954
1955                                 if ((new_aggregator->lag_ports == port) &&
1956                                     new_aggregator->is_active) {
1957                                         pr_info("%s: Removing an active aggregator\n",
1958                                                 aggregator->slave->bond->dev->name);
1959                                          select_new_active_agg = 1;
1960                                 }
1961
1962                                 new_aggregator->is_individual = aggregator->is_individual;
1963                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1964                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1965                                 new_aggregator->partner_system = aggregator->partner_system;
1966                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1967                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1968                                 new_aggregator->receive_state = aggregator->receive_state;
1969                                 new_aggregator->transmit_state = aggregator->transmit_state;
1970                                 new_aggregator->lag_ports = aggregator->lag_ports;
1971                                 new_aggregator->is_active = aggregator->is_active;
1972                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
1973
1974                                 /* update the information that is written on
1975                                  * the ports about the aggregator
1976                                  */
1977                                 for (temp_port = aggregator->lag_ports; temp_port;
1978                                      temp_port = temp_port->next_port_in_aggregator) {
1979                                         temp_port->aggregator = new_aggregator;
1980                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1981                                 }
1982
1983                                 ad_clear_agg(aggregator);
1984
1985                                 if (select_new_active_agg)
1986                                         ad_agg_selection_logic(__get_first_agg(port));
1987                         } else {
1988                                 pr_warn("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
1989                                         slave->bond->dev->name);
1990                         }
1991                 } else {
1992                         /* in case that the only port related to this
1993                          * aggregator is the one we want to remove
1994                          */
1995                         select_new_active_agg = aggregator->is_active;
1996                         ad_clear_agg(aggregator);
1997                         if (select_new_active_agg) {
1998                                 pr_info("%s: Removing an active aggregator\n",
1999                                         slave->bond->dev->name);
2000                                 /* select new active aggregator */
2001                                 temp_aggregator = __get_first_agg(port);
2002                                 if (temp_aggregator)
2003                                         ad_agg_selection_logic(temp_aggregator);
2004                         }
2005                 }
2006         }
2007
2008         pr_debug("Unbinding port %d\n", port->actor_port_number);
2009
2010         /* find the aggregator that this port is connected to */
2011         bond_for_each_slave(bond, slave_iter, iter) {
2012                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
2013                 prev_port = NULL;
2014                 /* search the port in the aggregator's related ports */
2015                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2016                      prev_port = temp_port,
2017                      temp_port = temp_port->next_port_in_aggregator) {
2018                         if (temp_port == port) {
2019                                 /* the aggregator found - detach the port from
2020                                  * this aggregator
2021                                  */
2022                                 if (prev_port)
2023                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2024                                 else
2025                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2026                                 temp_aggregator->num_of_ports--;
2027                                 if (temp_aggregator->num_of_ports == 0) {
2028                                         select_new_active_agg = temp_aggregator->is_active;
2029                                         ad_clear_agg(temp_aggregator);
2030                                         if (select_new_active_agg) {
2031                                                 pr_info("%s: Removing an active aggregator\n",
2032                                                         slave->bond->dev->name);
2033                                                 /* select new active aggregator */
2034                                                 ad_agg_selection_logic(__get_first_agg(port));
2035                                         }
2036                                 }
2037                                 break;
2038                         }
2039                 }
2040         }
2041         port->slave = NULL;
2042 }
2043
2044 /**
2045  * bond_3ad_state_machine_handler - handle state machines timeout
2046  * @bond: bonding struct to work on
2047  *
2048  * The state machine handling concept in this module is to check every tick
2049  * which state machine should operate any function. The execution order is
2050  * round robin, so when we have an interaction between state machines, the
2051  * reply of one to each other might be delayed until next tick.
2052  *
2053  * This function also complete the initialization when the agg_select_timer
2054  * times out, and it selects an aggregator for the ports that are yet not
2055  * related to any aggregator, and selects the active aggregator for a bond.
2056  */
2057 void bond_3ad_state_machine_handler(struct work_struct *work)
2058 {
2059         struct bonding *bond = container_of(work, struct bonding,
2060                                             ad_work.work);
2061         struct aggregator *aggregator;
2062         struct list_head *iter;
2063         struct slave *slave;
2064         struct port *port;
2065         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2066
2067         read_lock(&bond->lock);
2068         rcu_read_lock();
2069
2070         /* check if there are any slaves */
2071         if (!bond_has_slaves(bond))
2072                 goto re_arm;
2073
2074         /* check if agg_select_timer timer after initialize is timed out */
2075         if (BOND_AD_INFO(bond).agg_select_timer &&
2076             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2077                 slave = bond_first_slave_rcu(bond);
2078                 port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
2079
2080                 /* select the active aggregator for the bond */
2081                 if (port) {
2082                         if (!port->slave) {
2083                                 pr_warn("%s: Warning: bond's first port is uninitialized\n",
2084                                         bond->dev->name);
2085                                 goto re_arm;
2086                         }
2087
2088                         aggregator = __get_first_agg(port);
2089                         ad_agg_selection_logic(aggregator);
2090                 }
2091                 bond_3ad_set_carrier(bond);
2092         }
2093
2094         /* for each port run the state machines */
2095         bond_for_each_slave_rcu(bond, slave, iter) {
2096                 port = &(SLAVE_AD_INFO(slave).port);
2097                 if (!port->slave) {
2098                         pr_warn("%s: Warning: Found an uninitialized port\n",
2099                                 bond->dev->name);
2100                         goto re_arm;
2101                 }
2102
2103                 /* Lock around state machines to protect data accessed
2104                  * by all (e.g., port->sm_vars).  ad_rx_machine may run
2105                  * concurrently due to incoming LACPDU.
2106                  */
2107                 __get_state_machine_lock(port);
2108
2109                 ad_rx_machine(NULL, port);
2110                 ad_periodic_machine(port);
2111                 ad_port_selection_logic(port);
2112                 ad_mux_machine(port);
2113                 ad_tx_machine(port);
2114
2115                 /* turn off the BEGIN bit, since we already handled it */
2116                 if (port->sm_vars & AD_PORT_BEGIN)
2117                         port->sm_vars &= ~AD_PORT_BEGIN;
2118
2119                 __release_state_machine_lock(port);
2120         }
2121
2122 re_arm:
2123         bond_for_each_slave_rcu(bond, slave, iter) {
2124                 if (slave->should_notify) {
2125                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2126                         break;
2127                 }
2128         }
2129         rcu_read_unlock();
2130         read_unlock(&bond->lock);
2131
2132         if (should_notify_rtnl && rtnl_trylock()) {
2133                 bond_slave_state_notify(bond);
2134                 rtnl_unlock();
2135         }
2136         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2137 }
2138
2139 /**
2140  * bond_3ad_rx_indication - handle a received frame
2141  * @lacpdu: received lacpdu
2142  * @slave: slave struct to work on
2143  * @length: length of the data received
2144  *
2145  * It is assumed that frames that were sent on this NIC don't returned as new
2146  * received frames (loopback). Since only the payload is given to this
2147  * function, it check for loopback.
2148  */
2149 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2150                                   u16 length)
2151 {
2152         struct port *port;
2153         int ret = RX_HANDLER_ANOTHER;
2154
2155         if (length >= sizeof(struct lacpdu)) {
2156
2157                 port = &(SLAVE_AD_INFO(slave).port);
2158
2159                 if (!port->slave) {
2160                         pr_warn("%s: Warning: port of slave %s is uninitialized\n",
2161                                 slave->dev->name, slave->bond->dev->name);
2162                         return ret;
2163                 }
2164
2165                 switch (lacpdu->subtype) {
2166                 case AD_TYPE_LACPDU:
2167                         ret = RX_HANDLER_CONSUMED;
2168                         pr_debug("Received LACPDU on port %d\n",
2169                                  port->actor_port_number);
2170                         /* Protect against concurrent state machines */
2171                         __get_state_machine_lock(port);
2172                         ad_rx_machine(lacpdu, port);
2173                         __release_state_machine_lock(port);
2174                         break;
2175
2176                 case AD_TYPE_MARKER:
2177                         ret = RX_HANDLER_CONSUMED;
2178                         /* No need to convert fields to Little Endian since we
2179                          * don't use the marker's fields.
2180                          */
2181
2182                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2183                         case AD_MARKER_INFORMATION_SUBTYPE:
2184                                 pr_debug("Received Marker Information on port %d\n",
2185                                          port->actor_port_number);
2186                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2187                                 break;
2188
2189                         case AD_MARKER_RESPONSE_SUBTYPE:
2190                                 pr_debug("Received Marker Response on port %d\n",
2191                                          port->actor_port_number);
2192                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2193                                 break;
2194
2195                         default:
2196                                 pr_debug("Received an unknown Marker subtype on slot %d\n",
2197                                          port->actor_port_number);
2198                         }
2199                 }
2200         }
2201         return ret;
2202 }
2203
2204 /**
2205  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2206  * @slave: slave struct to work on
2207  *
2208  * Handle reselection of aggregator (if needed) for this port.
2209  */
2210 void bond_3ad_adapter_speed_changed(struct slave *slave)
2211 {
2212         struct port *port;
2213
2214         port = &(SLAVE_AD_INFO(slave).port);
2215
2216         /* if slave is null, the whole port is not initialized */
2217         if (!port->slave) {
2218                 pr_warn("Warning: %s: speed changed for uninitialized port on %s\n",
2219                         slave->bond->dev->name, slave->dev->name);
2220                 return;
2221         }
2222
2223         __get_state_machine_lock(port);
2224
2225         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2226         port->actor_oper_port_key = port->actor_admin_port_key |=
2227                 (__get_link_speed(port) << 1);
2228         pr_debug("Port %d changed speed\n", port->actor_port_number);
2229         /* there is no need to reselect a new aggregator, just signal the
2230          * state machines to reinitialize
2231          */
2232         port->sm_vars |= AD_PORT_BEGIN;
2233
2234         __release_state_machine_lock(port);
2235 }
2236
2237 /**
2238  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2239  * @slave: slave struct to work on
2240  *
2241  * Handle reselection of aggregator (if needed) for this port.
2242  */
2243 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2244 {
2245         struct port *port;
2246
2247         port = &(SLAVE_AD_INFO(slave).port);
2248
2249         /* if slave is null, the whole port is not initialized */
2250         if (!port->slave) {
2251                 pr_warn("%s: Warning: duplex changed for uninitialized port on %s\n",
2252                         slave->bond->dev->name, slave->dev->name);
2253                 return;
2254         }
2255
2256         __get_state_machine_lock(port);
2257
2258         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2259         port->actor_oper_port_key = port->actor_admin_port_key |=
2260                 __get_duplex(port);
2261         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2262         /* there is no need to reselect a new aggregator, just signal the
2263          * state machines to reinitialize
2264          */
2265         port->sm_vars |= AD_PORT_BEGIN;
2266
2267         __release_state_machine_lock(port);
2268 }
2269
2270 /**
2271  * bond_3ad_handle_link_change - handle a slave's link status change indication
2272  * @slave: slave struct to work on
2273  * @status: whether the link is now up or down
2274  *
2275  * Handle reselection of aggregator (if needed) for this port.
2276  */
2277 void bond_3ad_handle_link_change(struct slave *slave, char link)
2278 {
2279         struct port *port;
2280
2281         port = &(SLAVE_AD_INFO(slave).port);
2282
2283         /* if slave is null, the whole port is not initialized */
2284         if (!port->slave) {
2285                 pr_warn("Warning: %s: link status changed for uninitialized port on %s\n",
2286                         slave->bond->dev->name, slave->dev->name);
2287                 return;
2288         }
2289
2290         __get_state_machine_lock(port);
2291         /* on link down we are zeroing duplex and speed since
2292          * some of the adaptors(ce1000.lan) report full duplex/speed
2293          * instead of N/A(duplex) / 0(speed).
2294          *
2295          * on link up we are forcing recheck on the duplex and speed since
2296          * some of he adaptors(ce1000.lan) report.
2297          */
2298         if (link == BOND_LINK_UP) {
2299                 port->is_enabled = true;
2300                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2301                 port->actor_oper_port_key = port->actor_admin_port_key |=
2302                         __get_duplex(port);
2303                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2304                 port->actor_oper_port_key = port->actor_admin_port_key |=
2305                         (__get_link_speed(port) << 1);
2306         } else {
2307                 /* link has failed */
2308                 port->is_enabled = false;
2309                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2310                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2311                                              ~AD_SPEED_KEY_BITS);
2312         }
2313         pr_debug("Port %d changed link status to %s",
2314                 port->actor_port_number,
2315                 (link == BOND_LINK_UP) ? "UP" : "DOWN");
2316         /* there is no need to reselect a new aggregator, just signal the
2317          * state machines to reinitialize
2318          */
2319         port->sm_vars |= AD_PORT_BEGIN;
2320
2321         __release_state_machine_lock(port);
2322 }
2323
2324 /**
2325  * bond_3ad_set_carrier - set link state for bonding master
2326  * @bond - bonding structure
2327  *
2328  * if we have an active aggregator, we're up, if not, we're down.
2329  * Presumes that we cannot have an active aggregator if there are
2330  * no slaves with link up.
2331  *
2332  * This behavior complies with IEEE 802.3 section 43.3.9.
2333  *
2334  * Called by bond_set_carrier(). Return zero if carrier state does not
2335  * change, nonzero if it does.
2336  */
2337 int bond_3ad_set_carrier(struct bonding *bond)
2338 {
2339         struct aggregator *active;
2340         struct slave *first_slave;
2341         int ret = 1;
2342
2343         rcu_read_lock();
2344         first_slave = bond_first_slave_rcu(bond);
2345         if (!first_slave) {
2346                 ret = 0;
2347                 goto out;
2348         }
2349         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
2350         if (active) {
2351                 /* are enough slaves available to consider link up? */
2352                 if (active->num_of_ports < bond->params.min_links) {
2353                         if (netif_carrier_ok(bond->dev)) {
2354                                 netif_carrier_off(bond->dev);
2355                                 goto out;
2356                         }
2357                 } else if (!netif_carrier_ok(bond->dev)) {
2358                         netif_carrier_on(bond->dev);
2359                         goto out;
2360                 }
2361         } else if (netif_carrier_ok(bond->dev)) {
2362                 netif_carrier_off(bond->dev);
2363         }
2364 out:
2365         rcu_read_unlock();
2366         return ret;
2367 }
2368
2369 /**
2370  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2371  * @bond: bonding struct to work on
2372  * @ad_info: ad_info struct to fill with the bond's info
2373  *
2374  * Returns:   0 on success
2375  *          < 0 on error
2376  */
2377 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2378                                    struct ad_info *ad_info)
2379 {
2380         struct aggregator *aggregator = NULL;
2381         struct list_head *iter;
2382         struct slave *slave;
2383         struct port *port;
2384
2385         bond_for_each_slave_rcu(bond, slave, iter) {
2386                 port = &(SLAVE_AD_INFO(slave).port);
2387                 if (port->aggregator && port->aggregator->is_active) {
2388                         aggregator = port->aggregator;
2389                         break;
2390                 }
2391         }
2392
2393         if (aggregator) {
2394                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2395                 ad_info->ports = aggregator->num_of_ports;
2396                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2397                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2398                 memcpy(ad_info->partner_system,
2399                        aggregator->partner_system.mac_addr_value, ETH_ALEN);
2400                 return 0;
2401         }
2402
2403         return -1;
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 && SLAVE_IS_OK(slave))
2453                                 first_ok_slave = slave;
2454                         slave_agg_no--;
2455                         continue;
2456                 }
2457
2458                 if (SLAVE_IS_OK(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         kfree_skb(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 }