drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #include <linux/skbuff.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/if_bonding.h>
  30 #include <linux/pkt_sched.h>
  31 #include <net/net_namespace.h>
  32 #include <net/bonding.h>
  33 #include <net/bond_3ad.h>
  34
  35 /* General definitions */
  36 #define AD_SHORT_TIMEOUT           1
  37 #define AD_LONG_TIMEOUT            0
  38 #define AD_STANDBY                 0x2
  39 #define AD_MAX_TX_IN_SECOND        3
  40 #define AD_COLLECTOR_MAX_DELAY     0
  41
  42 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  43 #define AD_FAST_PERIODIC_TIME      1
  44 #define AD_SLOW_PERIODIC_TIME      30
  45 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  46 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  47 #define AD_CHURN_DETECTION_TIME    60
  48 #define AD_AGGREGATE_WAIT_TIME     2
  49
  50 /* Port state definitions (43.4.2.2 in the 802.3ad standard) */
  51 #define AD_STATE_LACP_ACTIVITY   0x1
  52 #define AD_STATE_LACP_TIMEOUT    0x2
  53 #define AD_STATE_AGGREGATION     0x4
  54 #define AD_STATE_SYNCHRONIZATION 0x8
  55 #define AD_STATE_COLLECTING      0x10
  56 #define AD_STATE_DISTRIBUTING    0x20
  57 #define AD_STATE_DEFAULTED       0x40
  58 #define AD_STATE_EXPIRED         0x80
  59
  60 /* Port Variables definitions used by the State Machines (43.4.7 in the
  61  * 802.3ad standard)
  62  */
  63 #define AD_PORT_BEGIN           0x1
  64 #define AD_PORT_LACP_ENABLED    0x2
  65 #define AD_PORT_ACTOR_CHURN     0x4
  66 #define AD_PORT_PARTNER_CHURN   0x8
  67 #define AD_PORT_READY           0x10
  68 #define AD_PORT_READY_N         0x20
  69 #define AD_PORT_MATCHED         0x40
  70 #define AD_PORT_STANDBY         0x80
  71 #define AD_PORT_SELECTED        0x100
  72 #define AD_PORT_MOVED           0x200
  73 #define AD_PORT_CHURNED         (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
  74
  75 /* Port Key definitions
  76  * key is determined according to the link speed, duplex and
  77  * user key (which is yet not supported)
  78  *           --------------------------------------------------------------
  79  * Port key  | User key (10 bits)           | Speed (5 bits)      | Duplex|
  80  *           --------------------------------------------------------------
  81  *           |15                           6|5                   1|0
  82  */
  83 #define  AD_DUPLEX_KEY_MASKS    0x1
  84 #define  AD_SPEED_KEY_MASKS     0x3E
  85 #define  AD_USER_KEY_MASKS      0xFFC0
  86
  87 enum ad_link_speed_type {
  88         AD_LINK_SPEED_1MBPS = 1,
  89         AD_LINK_SPEED_10MBPS,
  90         AD_LINK_SPEED_100MBPS,
  91         AD_LINK_SPEED_1000MBPS,
  92         AD_LINK_SPEED_2500MBPS,
  93         AD_LINK_SPEED_10000MBPS,
  94         AD_LINK_SPEED_20000MBPS,
  95         AD_LINK_SPEED_40000MBPS,
  96         AD_LINK_SPEED_56000MBPS
  97 };
  98
  99 /* compare MAC addresses */
 100 #define MAC_ADDRESS_EQUAL(A, B) \
 101         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
 102
 103 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
 104 static u16 ad_ticks_per_sec;
 105 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
 106
 107 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 108
 109 /* ================= main 802.3ad protocol functions ================== */
 110 static int ad_lacpdu_send(struct port *port);
 111 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 112 static void ad_mux_machine(struct port *port, bool *update_slave_arr);
 113 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 114 static void ad_tx_machine(struct port *port);
 115 static void ad_periodic_machine(struct port *port);
 116 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
 117 static void ad_agg_selection_logic(struct aggregator *aggregator,
 118                                    bool *update_slave_arr);
 119 static void ad_clear_agg(struct aggregator *aggregator);
 120 static void ad_initialize_agg(struct aggregator *aggregator);
 121 static void ad_initialize_port(struct port *port, int lacp_fast);
 122 static void ad_enable_collecting_distributing(struct port *port,
 123                                               bool *update_slave_arr);
 124 static void ad_disable_collecting_distributing(struct port *port,
 125                                                bool *update_slave_arr);
 126 static void ad_marker_info_received(struct bond_marker *marker_info,
 127                                     struct port *port);
 128 static void ad_marker_response_received(struct bond_marker *marker,
 129                                         struct port *port);
 130
 131
 132 /* ================= api to bonding and kernel code ================== */
 133
 134 /**
 135  * __get_bond_by_port - get the port's bonding struct
 136  * @port: the port we're looking at
 137  *
 138  * Return @port's bonding struct, or %NULL if it can't be found.
 139  */
 140 static inline struct bonding *__get_bond_by_port(struct port *port)
 141 {
 142         if (port->slave == NULL)
 143                 return NULL;
 144
 145         return bond_get_bond_by_slave(port->slave);
 146 }
 147
 148 /**
 149  * __get_first_agg - get the first aggregator in the bond
 150  * @bond: the bond we're looking at
 151  *
 152  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 153  * found.
 154  * The caller must hold RCU or RTNL lock.
 155  */
 156 static inline struct aggregator *__get_first_agg(struct port *port)
 157 {
 158         struct bonding *bond = __get_bond_by_port(port);
 159         struct slave *first_slave;
 160         struct aggregator *agg;
 161
 162         /* If there's no bond for this port, or bond has no slaves */
 163         if (bond == NULL)
 164                 return NULL;
 165
 166         rcu_read_lock();
 167         first_slave = bond_first_slave_rcu(bond);
 168         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 169         rcu_read_unlock();
 170
 171         return agg;
 172 }
 173
 174 /**
 175  * __agg_has_partner - see if we have a partner
 176  * @agg: the agregator we're looking at
 177  *
 178  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 179  * address for the partner). Return 0 if not.
 180  */
 181 static inline int __agg_has_partner(struct aggregator *agg)
 182 {
 183         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 184 }
 185
 186 /**
 187  * __disable_port - disable the port's slave
 188  * @port: the port we're looking at
 189  */
 190 static inline void __disable_port(struct port *port)
 191 {
 192         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 193 }
 194
 195 /**
 196  * __enable_port - enable the port's slave, if it's up
 197  * @port: the port we're looking at
 198  */
 199 static inline void __enable_port(struct port *port)
 200 {
 201         struct slave *slave = port->slave;
 202
 203         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 204                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 205 }
 206
 207 /**
 208  * __port_is_enabled - check if the port's slave is in active state
 209  * @port: the port we're looking at
 210  */
 211 static inline int __port_is_enabled(struct port *port)
 212 {
 213         return bond_is_active_slave(port->slave);
 214 }
 215
 216 /**
 217  * __get_agg_selection_mode - get the aggregator selection mode
 218  * @port: the port we're looking at
 219  *
 220  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 221  */
 222 static inline u32 __get_agg_selection_mode(struct port *port)
 223 {
 224         struct bonding *bond = __get_bond_by_port(port);
 225
 226         if (bond == NULL)
 227                 return BOND_AD_STABLE;
 228
 229         return bond->params.ad_select;
 230 }
 231
 232 /**
 233  * __check_agg_selection_timer - check if the selection timer has expired
 234  * @port: the port we're looking at
 235  */
 236 static inline int __check_agg_selection_timer(struct port *port)
 237 {
 238         struct bonding *bond = __get_bond_by_port(port);
 239
 240         if (bond == NULL)
 241                 return 0;
 242
 243         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 244 }
 245
 246 /**
 247  * __get_link_speed - get a port's speed
 248  * @port: the port we're looking at
 249  *
 250  * Return @port's speed in 802.3ad enum format. i.e. one of:
 251  *     0,
 252  *     %AD_LINK_SPEED_10MBPS,
 253  *     %AD_LINK_SPEED_100MBPS,
 254  *     %AD_LINK_SPEED_1000MBPS,
 255  *     %AD_LINK_SPEED_2500MBPS,
 256  *     %AD_LINK_SPEED_10000MBPS
 257  *     %AD_LINK_SPEED_20000MBPS
 258  *     %AD_LINK_SPEED_40000MBPS
 259  *     %AD_LINK_SPEED_56000MBPS
 260  */
 261 static u16 __get_link_speed(struct port *port)
 262 {
 263         struct slave *slave = port->slave;
 264         u16 speed;
 265
 266         /* this if covers only a special case: when the configuration starts
 267          * with link down, it sets the speed to 0.
 268          * This is done in spite of the fact that the e100 driver reports 0
 269          * to be compatible with MVT in the future.
 270          */
 271         if (slave->link != BOND_LINK_UP)
 272                 speed = 0;
 273         else {
 274                 switch (slave->speed) {
 275                 case SPEED_10:
 276                         speed = AD_LINK_SPEED_10MBPS;
 277                         break;
 278
 279                 case SPEED_100:
 280                         speed = AD_LINK_SPEED_100MBPS;
 281                         break;
 282
 283                 case SPEED_1000:
 284                         speed = AD_LINK_SPEED_1000MBPS;
 285                         break;
 286
 287                 case SPEED_2500:
 288                         speed = AD_LINK_SPEED_2500MBPS;
 289                         break;
 290
 291                 case SPEED_10000:
 292                         speed = AD_LINK_SPEED_10000MBPS;
 293                         break;
 294
 295                 case SPEED_20000:
 296                         speed = AD_LINK_SPEED_20000MBPS;
 297                         break;
 298
 299                 case SPEED_40000:
 300                         speed = AD_LINK_SPEED_40000MBPS;
 301                         break;
 302
 303                 case SPEED_56000:
 304                         speed = AD_LINK_SPEED_56000MBPS;
 305                         break;
 306
 307                 default:
 308                         /* unknown speed value from ethtool. shouldn't happen */
 309                         speed = 0;
 310                         break;
 311                 }
 312         }
 313
 314         netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
 315                    port->actor_port_number, speed);
 316         return speed;
 317 }
 318
 319 /**
 320  * __get_duplex - get a port's duplex
 321  * @port: the port we're looking at
 322  *
 323  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 324  *     0x01 if in full duplex
 325  *     0x00 otherwise
 326  */
 327 static u8 __get_duplex(struct port *port)
 328 {
 329         struct slave *slave = port->slave;
 330         u8 retval;
 331
 332         /* handling a special case: when the configuration starts with
 333          * link down, it sets the duplex to 0.
 334          */
 335         if (slave->link != BOND_LINK_UP) {
 336                 retval = 0x0;
 337         } else {
 338                 switch (slave->duplex) {
 339                 case DUPLEX_FULL:
 340                         retval = 0x1;
 341                         netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
 342                                    port->actor_port_number);
 343                         break;
 344                 case DUPLEX_HALF:
 345                 default:
 346                         retval = 0x0;
 347                         netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
 348                                    port->actor_port_number);
 349                         break;
 350                 }
 351         }
 352         return retval;
 353 }
 354
 355 /* Conversions */
 356
 357 /**
 358  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 359  * @timer_type: which timer to operate
 360  * @par: timer parameter. see below
 361  *
 362  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 363  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 364  *                                                   %SLOW_PERIODIC_TIME.
 365  */
 366 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 367 {
 368         u16 retval = 0; /* to silence the compiler */
 369
 370         switch (timer_type) {
 371         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 372                 if (par)
 373                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 374                 else
 375                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 376                 break;
 377         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 378                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 379                 break;
 380         case AD_PERIODIC_TIMER:         /* for periodic machine */
 381                 retval = (par*ad_ticks_per_sec); /* long timeout */
 382                 break;
 383         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 384                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 385                 break;
 386         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 387                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 388                 break;
 389         }
 390
 391         return retval;
 392 }
 393
 394
 395 /* ================= ad_rx_machine helper functions ================== */
 396
 397 /**
 398  * __choose_matched - update a port's matched variable from a received lacpdu
 399  * @lacpdu: the lacpdu we've received
 400  * @port: the port we're looking at
 401  *
 402  * Update the value of the matched variable, using parameter values from a
 403  * newly received lacpdu. Parameter values for the partner carried in the
 404  * received PDU are compared with the corresponding operational parameter
 405  * values for the actor. Matched is set to TRUE if all of these parameters
 406  * match and the PDU parameter partner_state.aggregation has the same value as
 407  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 408  * in the aggregation. Matched is also set to TRUE if the value of
 409  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 410  * an individual link and lacp will actively maintain the link. Otherwise,
 411  * matched is set to FALSE. LACP is considered to be actively maintaining the
 412  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 413  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 414  * partner_state.lacp_activity variables are TRUE.
 415  *
 416  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 417  * used here to implement the language from 802.3ad 43.4.9 that requires
 418  * recordPDU to "match" the LACPDU parameters to the stored values.
 419  */
 420 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 421 {
 422         /* check if all parameters are alike
 423          * or this is individual link(aggregation == FALSE)
 424          * then update the state machine Matched variable.
 425          */
 426         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 427              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 428              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 429              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 430              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 431              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 432             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 433                 ) {
 434                 port->sm_vars |= AD_PORT_MATCHED;
 435         } else {
 436                 port->sm_vars &= ~AD_PORT_MATCHED;
 437         }
 438 }
 439
 440 /**
 441  * __record_pdu - record parameters from a received lacpdu
 442  * @lacpdu: the lacpdu we've received
 443  * @port: the port we're looking at
 444  *
 445  * Record the parameter values for the Actor carried in a received lacpdu as
 446  * the current partner operational parameter values and sets
 447  * actor_oper_port_state.defaulted to FALSE.
 448  */
 449 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 450 {
 451         if (lacpdu && port) {
 452                 struct port_params *partner = &port->partner_oper;
 453
 454                 __choose_matched(lacpdu, port);
 455                 /* record the new parameter values for the partner
 456                  * operational
 457                  */
 458                 partner->port_number = ntohs(lacpdu->actor_port);
 459                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 460                 partner->system = lacpdu->actor_system;
 461                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 462                 partner->key = ntohs(lacpdu->actor_key);
 463                 partner->port_state = lacpdu->actor_state;
 464
 465                 /* set actor_oper_port_state.defaulted to FALSE */
 466                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 467
 468                 /* set the partner sync. to on if the partner is sync,
 469                  * and the port is matched
 470                  */
 471                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 472                     (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 473                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 474                         pr_debug("%s partner sync=1\n", port->slave->dev->name);
 475                 } else {
 476                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 477                         pr_debug("%s partner sync=0\n", port->slave->dev->name);
 478                 }
 479         }
 480 }
 481
 482 /**
 483  * __record_default - record default parameters
 484  * @port: the port we're looking at
 485  *
 486  * This function records the default parameter values for the partner carried
 487  * in the Partner Admin parameters as the current partner operational parameter
 488  * values and sets actor_oper_port_state.defaulted to TRUE.
 489  */
 490 static void __record_default(struct port *port)
 491 {
 492         if (port) {
 493                 /* record the partner admin parameters */
 494                 memcpy(&port->partner_oper, &port->partner_admin,
 495                        sizeof(struct port_params));
 496
 497                 /* set actor_oper_port_state.defaulted to true */
 498                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 499         }
 500 }
 501
 502 /**
 503  * __update_selected - update a port's Selected variable from a received lacpdu
 504  * @lacpdu: the lacpdu we've received
 505  * @port: the port we're looking at
 506  *
 507  * Update the value of the selected variable, using parameter values from a
 508  * newly received lacpdu. The parameter values for the Actor carried in the
 509  * received PDU are compared with the corresponding operational parameter
 510  * values for the ports partner. If one or more of the comparisons shows that
 511  * the value(s) received in the PDU differ from the current operational values,
 512  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 513  * set to out_of_sync. Otherwise, selected remains unchanged.
 514  */
 515 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 516 {
 517         if (lacpdu && port) {
 518                 const struct port_params *partner = &port->partner_oper;
 519
 520                 /* check if any parameter is different then
 521                  * update the state machine selected variable.
 522                  */
 523                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 524                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 525                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 526                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 527                     ntohs(lacpdu->actor_key) != partner->key ||
 528                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 529                         port->sm_vars &= ~AD_PORT_SELECTED;
 530                 }
 531         }
 532 }
 533
 534 /**
 535  * __update_default_selected - update a port's Selected variable from Partner
 536  * @port: the port we're looking at
 537  *
 538  * This function updates the value of the selected variable, using the partner
 539  * administrative parameter values. The administrative values are compared with
 540  * the corresponding operational parameter values for the partner. If one or
 541  * more of the comparisons shows that the administrative value(s) differ from
 542  * the current operational values, then Selected is set to FALSE and
 543  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 544  * Selected remains unchanged.
 545  */
 546 static void __update_default_selected(struct port *port)
 547 {
 548         if (port) {
 549                 const struct port_params *admin = &port->partner_admin;
 550                 const struct port_params *oper = &port->partner_oper;
 551
 552                 /* check if any parameter is different then
 553                  * update the state machine selected variable.
 554                  */
 555                 if (admin->port_number != oper->port_number ||
 556                     admin->port_priority != oper->port_priority ||
 557                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 558                     admin->system_priority != oper->system_priority ||
 559                     admin->key != oper->key ||
 560                     (admin->port_state & AD_STATE_AGGREGATION)
 561                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 562                         port->sm_vars &= ~AD_PORT_SELECTED;
 563                 }
 564         }
 565 }
 566
 567 /**
 568  * __update_ntt - update a port's ntt variable from a received lacpdu
 569  * @lacpdu: the lacpdu we've received
 570  * @port: the port we're looking at
 571  *
 572  * Updates the value of the ntt variable, using parameter values from a newly
 573  * received lacpdu. The parameter values for the partner carried in the
 574  * received PDU are compared with the corresponding operational parameter
 575  * values for the Actor. If one or more of the comparisons shows that the
 576  * value(s) received in the PDU differ from the current operational values,
 577  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 578  */
 579 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 580 {
 581         /* validate lacpdu and port */
 582         if (lacpdu && port) {
 583                 /* check if any parameter is different then
 584                  * update the port->ntt.
 585                  */
 586                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 587                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 588                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 589                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 590                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 591                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 592                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 593                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 594                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 595                    ) {
 596                         port->ntt = true;
 597                 }
 598         }
 599 }
 600
 601 /**
 602  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 603  * @aggregator: the aggregator we're looking at
 604  *
 605  */
 606 static int __agg_ports_are_ready(struct aggregator *aggregator)
 607 {
 608         struct port *port;
 609         int retval = 1;
 610
 611         if (aggregator) {
 612                 /* scan all ports in this aggregator to verfy if they are
 613                  * all ready.
 614                  */
 615                 for (port = aggregator->lag_ports;
 616                      port;
 617                      port = port->next_port_in_aggregator) {
 618                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 619                                 retval = 0;
 620                                 break;
 621                         }
 622                 }
 623         }
 624
 625         return retval;
 626 }
 627
 628 /**
 629  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 630  * @aggregator: the aggregator we're looking at
 631  * @val: Should the ports' ready bit be set on or off
 632  *
 633  */
 634 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 635 {
 636         struct port *port;
 637
 638         for (port = aggregator->lag_ports; port;
 639              port = port->next_port_in_aggregator) {
 640                 if (val)
 641                         port->sm_vars |= AD_PORT_READY;
 642                 else
 643                         port->sm_vars &= ~AD_PORT_READY;
 644         }
 645 }
 646
 647 /**
 648  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 649  * @aggregator: the aggregator we're looking at
 650  *
 651  */
 652 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 653 {
 654         u32 bandwidth = 0;
 655
 656         if (aggregator->num_of_ports) {
 657                 switch (__get_link_speed(aggregator->lag_ports)) {
 658                 case AD_LINK_SPEED_1MBPS:
 659                         bandwidth = aggregator->num_of_ports;
 660                         break;
 661                 case AD_LINK_SPEED_10MBPS:
 662                         bandwidth = aggregator->num_of_ports * 10;
 663                         break;
 664                 case AD_LINK_SPEED_100MBPS:
 665                         bandwidth = aggregator->num_of_ports * 100;
 666                         break;
 667                 case AD_LINK_SPEED_1000MBPS:
 668                         bandwidth = aggregator->num_of_ports * 1000;
 669                         break;
 670                 case AD_LINK_SPEED_2500MBPS:
 671                         bandwidth = aggregator->num_of_ports * 2500;
 672                         break;
 673                 case AD_LINK_SPEED_10000MBPS:
 674                         bandwidth = aggregator->num_of_ports * 10000;
 675                         break;
 676                 case AD_LINK_SPEED_20000MBPS:
 677                         bandwidth = aggregator->num_of_ports * 20000;
 678                         break;
 679                 case AD_LINK_SPEED_40000MBPS:
 680                         bandwidth = aggregator->num_of_ports * 40000;
 681                         break;
 682                 case AD_LINK_SPEED_56000MBPS:
 683                         bandwidth = aggregator->num_of_ports * 56000;
 684                         break;
 685                 default:
 686                         bandwidth = 0; /* to silence the compiler */
 687                 }
 688         }
 689         return bandwidth;
 690 }
 691
 692 /**
 693  * __get_active_agg - get the current active aggregator
 694  * @aggregator: the aggregator we're looking at
 695  *
 696  * Caller must hold RCU lock.
 697  */
 698 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 699 {
 700         struct bonding *bond = aggregator->slave->bond;
 701         struct list_head *iter;
 702         struct slave *slave;
 703
 704         bond_for_each_slave_rcu(bond, slave, iter)
 705                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 706                         return &(SLAVE_AD_INFO(slave)->aggregator);
 707
 708         return NULL;
 709 }
 710
 711 /**
 712  * __update_lacpdu_from_port - update a port's lacpdu fields
 713  * @port: the port we're looking at
 714  */
 715 static inline void __update_lacpdu_from_port(struct port *port)
 716 {
 717         struct lacpdu *lacpdu = &port->lacpdu;
 718         const struct port_params *partner = &port->partner_oper;
 719
 720         /* update current actual Actor parameters
 721          * lacpdu->subtype                   initialized
 722          * lacpdu->version_number            initialized
 723          * lacpdu->tlv_type_actor_info       initialized
 724          * lacpdu->actor_information_length  initialized
 725          */
 726
 727         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 728         lacpdu->actor_system = port->actor_system;
 729         lacpdu->actor_key = htons(port->actor_oper_port_key);
 730         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 731         lacpdu->actor_port = htons(port->actor_port_number);
 732         lacpdu->actor_state = port->actor_oper_port_state;
 733         pr_debug("update lacpdu: %s, actor port state %x\n",
 734                  port->slave->dev->name, port->actor_oper_port_state);
 735
 736         /* lacpdu->reserved_3_1              initialized
 737          * lacpdu->tlv_type_partner_info     initialized
 738          * lacpdu->partner_information_length initialized
 739          */
 740
 741         lacpdu->partner_system_priority = htons(partner->system_priority);
 742         lacpdu->partner_system = partner->system;
 743         lacpdu->partner_key = htons(partner->key);
 744         lacpdu->partner_port_priority = htons(partner->port_priority);
 745         lacpdu->partner_port = htons(partner->port_number);
 746         lacpdu->partner_state = partner->port_state;
 747
 748         /* lacpdu->reserved_3_2              initialized
 749          * lacpdu->tlv_type_collector_info   initialized
 750          * lacpdu->collector_information_length initialized
 751          * collector_max_delay                initialized
 752          * reserved_12[12]                   initialized
 753          * tlv_type_terminator               initialized
 754          * terminator_length                 initialized
 755          * reserved_50[50]                   initialized
 756          */
 757 }
 758
 759 /* ================= main 802.3ad protocol code ========================= */
 760
 761 /**
 762  * ad_lacpdu_send - send out a lacpdu packet on a given port
 763  * @port: the port we're looking at
 764  *
 765  * Returns:   0 on success
 766  *          < 0 on error
 767  */
 768 static int ad_lacpdu_send(struct port *port)
 769 {
 770         struct slave *slave = port->slave;
 771         struct sk_buff *skb;
 772         struct lacpdu_header *lacpdu_header;
 773         int length = sizeof(struct lacpdu_header);
 774
 775         skb = dev_alloc_skb(length);
 776         if (!skb)
 777                 return -ENOMEM;
 778
 779         skb->dev = slave->dev;
 780         skb_reset_mac_header(skb);
 781         skb->network_header = skb->mac_header + ETH_HLEN;
 782         skb->protocol = PKT_TYPE_LACPDU;
 783         skb->priority = TC_PRIO_CONTROL;
 784
 785         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 786
 787         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 788         /* Note: source address is set to be the member's PERMANENT address,
 789          * because we use it to identify loopback lacpdus in receive.
 790          */
 791         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 792         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 793
 794         lacpdu_header->lacpdu = port->lacpdu;
 795
 796         dev_queue_xmit(skb);
 797
 798         return 0;
 799 }
 800
 801 /**
 802  * ad_marker_send - send marker information/response on a given port
 803  * @port: the port we're looking at
 804  * @marker: marker data to send
 805  *
 806  * Returns:   0 on success
 807  *          < 0 on error
 808  */
 809 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 810 {
 811         struct slave *slave = port->slave;
 812         struct sk_buff *skb;
 813         struct bond_marker_header *marker_header;
 814         int length = sizeof(struct bond_marker_header);
 815
 816         skb = dev_alloc_skb(length + 16);
 817         if (!skb)
 818                 return -ENOMEM;
 819
 820         skb_reserve(skb, 16);
 821
 822         skb->dev = slave->dev;
 823         skb_reset_mac_header(skb);
 824         skb->network_header = skb->mac_header + ETH_HLEN;
 825         skb->protocol = PKT_TYPE_LACPDU;
 826
 827         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 828
 829         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 830         /* Note: source address is set to be the member's PERMANENT address,
 831          * because we use it to identify loopback MARKERs in receive.
 832          */
 833         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 834         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 835
 836         marker_header->marker = *marker;
 837
 838         dev_queue_xmit(skb);
 839
 840         return 0;
 841 }
 842
 843 /**
 844  * ad_mux_machine - handle a port's mux state machine
 845  * @port: the port we're looking at
 846  * @update_slave_arr: Does slave array need update?
 847  */
 848 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 849 {
 850         mux_states_t last_state;
 851
 852         /* keep current State Machine state to compare later if it was
 853          * changed
 854          */
 855         last_state = port->sm_mux_state;
 856
 857         if (port->sm_vars & AD_PORT_BEGIN) {
 858                 port->sm_mux_state = AD_MUX_DETACHED;
 859         } else {
 860                 switch (port->sm_mux_state) {
 861                 case AD_MUX_DETACHED:
 862                         if ((port->sm_vars & AD_PORT_SELECTED)
 863                             || (port->sm_vars & AD_PORT_STANDBY))
 864                                 /* if SELECTED or STANDBY */
 865                                 port->sm_mux_state = AD_MUX_WAITING;
 866                         break;
 867                 case AD_MUX_WAITING:
 868                         /* if SELECTED == FALSE return to DETACH state */
 869                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 870                                 port->sm_vars &= ~AD_PORT_READY_N;
 871                                 /* in order to withhold the Selection Logic to
 872                                  * check all ports READY_N value every callback
 873                                  * cycle to update ready variable, we check
 874                                  * READY_N and update READY here
 875                                  */
 876                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 877                                 port->sm_mux_state = AD_MUX_DETACHED;
 878                                 break;
 879                         }
 880
 881                         /* check if the wait_while_timer expired */
 882                         if (port->sm_mux_timer_counter
 883                             && !(--port->sm_mux_timer_counter))
 884                                 port->sm_vars |= AD_PORT_READY_N;
 885
 886                         /* in order to withhold the selection logic to check
 887                          * all ports READY_N value every callback cycle to
 888                          * update ready variable, we check READY_N and update
 889                          * READY here
 890                          */
 891                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 892
 893                         /* if the wait_while_timer expired, and the port is
 894                          * in READY state, move to ATTACHED state
 895                          */
 896                         if ((port->sm_vars & AD_PORT_READY)
 897                             && !port->sm_mux_timer_counter)
 898                                 port->sm_mux_state = AD_MUX_ATTACHED;
 899                         break;
 900                 case AD_MUX_ATTACHED:
 901                         /* check also if agg_select_timer expired (so the
 902                          * edable port will take place only after this timer)
 903                          */
 904                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 905                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 906                             !__check_agg_selection_timer(port)) {
 907                                 if (port->aggregator->is_active)
 908                                         port->sm_mux_state =
 909                                             AD_MUX_COLLECTING_DISTRIBUTING;
 910                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 911                                    (port->sm_vars & AD_PORT_STANDBY)) {
 912                                 /* if UNSELECTED or STANDBY */
 913                                 port->sm_vars &= ~AD_PORT_READY_N;
 914                                 /* in order to withhold the selection logic to
 915                                  * check all ports READY_N value every callback
 916                                  * cycle to update ready variable, we check
 917                                  * READY_N and update READY here
 918                                  */
 919                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 920                                 port->sm_mux_state = AD_MUX_DETACHED;
 921                         } else if (port->aggregator->is_active) {
 922                                 port->actor_oper_port_state |=
 923                                     AD_STATE_SYNCHRONIZATION;
 924                         }
 925                         break;
 926                 case AD_MUX_COLLECTING_DISTRIBUTING:
 927                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
 928                             (port->sm_vars & AD_PORT_STANDBY) ||
 929                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
 930                             !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
 931                                 port->sm_mux_state = AD_MUX_ATTACHED;
 932                         } else {
 933                                 /* if port state hasn't changed make
 934                                  * sure that a collecting distributing
 935                                  * port in an active aggregator is enabled
 936                                  */
 937                                 if (port->aggregator &&
 938                                     port->aggregator->is_active &&
 939                                     !__port_is_enabled(port)) {
 940
 941                                         __enable_port(port);
 942                                 }
 943                         }
 944                         break;
 945                 default:
 946                         break;
 947                 }
 948         }
 949
 950         /* check if the state machine was changed */
 951         if (port->sm_mux_state != last_state) {
 952                 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
 953                          port->actor_port_number,
 954                          port->slave->dev->name,
 955                          last_state,
 956                          port->sm_mux_state);
 957                 switch (port->sm_mux_state) {
 958                 case AD_MUX_DETACHED:
 959                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 960                         ad_disable_collecting_distributing(port,
 961                                                            update_slave_arr);
 962                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 963                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 964                         port->ntt = true;
 965                         break;
 966                 case AD_MUX_WAITING:
 967                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 968                         break;
 969                 case AD_MUX_ATTACHED:
 970                         if (port->aggregator->is_active)
 971                                 port->actor_oper_port_state |=
 972                                     AD_STATE_SYNCHRONIZATION;
 973                         else
 974                                 port->actor_oper_port_state &=
 975                                     ~AD_STATE_SYNCHRONIZATION;
 976                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 977                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 978                         ad_disable_collecting_distributing(port,
 979                                                            update_slave_arr);
 980                         port->ntt = true;
 981                         break;
 982                 case AD_MUX_COLLECTING_DISTRIBUTING:
 983                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 984                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 985                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 986                         ad_enable_collecting_distributing(port,
 987                                                           update_slave_arr);
 988                         port->ntt = true;
 989                         break;
 990                 default:
 991                         break;
 992                 }
 993         }
 994 }
 995
 996 /**
 997  * ad_rx_machine - handle a port's rx State Machine
 998  * @lacpdu: the lacpdu we've received
 999  * @port: the port we're looking at
1000  *
1001  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1002  * CURRENT. If timer expired set the state machine in the proper state.
1003  * In other cases, this function checks if we need to switch to other state.
1004  */
1005 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1006 {
1007         rx_states_t last_state;
1008
1009         /* keep current State Machine state to compare later if it was
1010          * changed
1011          */
1012         last_state = port->sm_rx_state;
1013
1014         /* check if state machine should change state */
1015
1016         /* first, check if port was reinitialized */
1017         if (port->sm_vars & AD_PORT_BEGIN) {
1018                 port->sm_rx_state = AD_RX_INITIALIZE;
1019                 port->sm_vars |= AD_PORT_CHURNED;
1020         /* check if port is not enabled */
1021         } else if (!(port->sm_vars & AD_PORT_BEGIN)
1022                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1023                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1024         /* check if new lacpdu arrived */
1025         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1026                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1027                  (port->sm_rx_state == AD_RX_CURRENT))) {
1028                 if (port->sm_rx_state != AD_RX_CURRENT)
1029                         port->sm_vars |= AD_PORT_CHURNED;
1030                 port->sm_rx_timer_counter = 0;
1031                 port->sm_rx_state = AD_RX_CURRENT;
1032         } else {
1033                 /* if timer is on, and if it is expired */
1034                 if (port->sm_rx_timer_counter &&
1035                     !(--port->sm_rx_timer_counter)) {
1036                         switch (port->sm_rx_state) {
1037                         case AD_RX_EXPIRED:
1038                                 port->sm_rx_state = AD_RX_DEFAULTED;
1039                                 break;
1040                         case AD_RX_CURRENT:
1041                                 port->sm_rx_state = AD_RX_EXPIRED;
1042                                 break;
1043                         default:
1044                                 break;
1045                         }
1046                 } else {
1047                         /* if no lacpdu arrived and no timer is on */
1048                         switch (port->sm_rx_state) {
1049                         case AD_RX_PORT_DISABLED:
1050                                 if (port->sm_vars & AD_PORT_MOVED)
1051                                         port->sm_rx_state = AD_RX_INITIALIZE;
1052                                 else if (port->is_enabled
1053                                          && (port->sm_vars
1054                                              & AD_PORT_LACP_ENABLED))
1055                                         port->sm_rx_state = AD_RX_EXPIRED;
1056                                 else if (port->is_enabled
1057                                          && ((port->sm_vars
1058                                               & AD_PORT_LACP_ENABLED) == 0))
1059                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1060                                 break;
1061                         default:
1062                                 break;
1063
1064                         }
1065                 }
1066         }
1067
1068         /* check if the State machine was changed or new lacpdu arrived */
1069         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1070                 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1071                          port->actor_port_number,
1072                          port->slave->dev->name,
1073                          last_state,
1074                          port->sm_rx_state);
1075                 switch (port->sm_rx_state) {
1076                 case AD_RX_INITIALIZE:
1077                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1078                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1079                         else
1080                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1081                         port->sm_vars &= ~AD_PORT_SELECTED;
1082                         __record_default(port);
1083                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1084                         port->sm_vars &= ~AD_PORT_MOVED;
1085                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1086
1087                         /* Fall Through */
1088                 case AD_RX_PORT_DISABLED:
1089                         port->sm_vars &= ~AD_PORT_MATCHED;
1090                         break;
1091                 case AD_RX_LACP_DISABLED:
1092                         port->sm_vars &= ~AD_PORT_SELECTED;
1093                         __record_default(port);
1094                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1095                         port->sm_vars |= AD_PORT_MATCHED;
1096                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1097                         break;
1098                 case AD_RX_EXPIRED:
1099                         /* Reset of the Synchronization flag (Standard 43.4.12)
1100                          * This reset cause to disable this port in the
1101                          * COLLECTING_DISTRIBUTING state of the mux machine in
1102                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1103                          * the port.
1104                          */
1105                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1106                         port->sm_vars &= ~AD_PORT_MATCHED;
1107                         port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1108                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1109                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1110                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1111                         port->sm_vars |= AD_PORT_CHURNED;
1112                         break;
1113                 case AD_RX_DEFAULTED:
1114                         __update_default_selected(port);
1115                         __record_default(port);
1116                         port->sm_vars |= AD_PORT_MATCHED;
1117                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1118                         break;
1119                 case AD_RX_CURRENT:
1120                         /* detect loopback situation */
1121                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1122                                               &(port->actor_system))) {
1123                                 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1124                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1125                                        port->slave->dev->name);
1126                                 return;
1127                         }
1128                         __update_selected(lacpdu, port);
1129                         __update_ntt(lacpdu, port);
1130                         __record_pdu(lacpdu, port);
1131                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1132                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1133                         break;
1134                 default:
1135                         break;
1136                 }
1137         }
1138 }
1139
1140 /**
1141  * ad_churn_machine - handle port churn's state machine
1142  * @port: the port we're looking at
1143  *
1144  */
1145 static void ad_churn_machine(struct port *port)
1146 {
1147         if (port->sm_vars & AD_PORT_CHURNED) {
1148                 port->sm_vars &= ~AD_PORT_CHURNED;
1149                 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1150                 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1151                 port->sm_churn_actor_timer_counter =
1152                         __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1153                  port->sm_churn_partner_timer_counter =
1154                          __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1155                 return;
1156         }
1157         if (port->sm_churn_actor_timer_counter &&
1158             !(--port->sm_churn_actor_timer_counter) &&
1159             port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1160                 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1161                         port->sm_churn_actor_state = AD_NO_CHURN;
1162                 } else {
1163                         port->churn_actor_count++;
1164                         port->sm_churn_actor_state = AD_CHURN;
1165                 }
1166         }
1167         if (port->sm_churn_partner_timer_counter &&
1168             !(--port->sm_churn_partner_timer_counter) &&
1169             port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1170                 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1171                         port->sm_churn_partner_state = AD_NO_CHURN;
1172                 } else {
1173                         port->churn_partner_count++;
1174                         port->sm_churn_partner_state = AD_CHURN;
1175                 }
1176         }
1177 }
1178
1179 /**
1180  * ad_tx_machine - handle a port's tx state machine
1181  * @port: the port we're looking at
1182  */
1183 static void ad_tx_machine(struct port *port)
1184 {
1185         /* check if tx timer expired, to verify that we do not send more than
1186          * 3 packets per second
1187          */
1188         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1189                 /* check if there is something to send */
1190                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1191                         __update_lacpdu_from_port(port);
1192
1193                         if (ad_lacpdu_send(port) >= 0) {
1194                                 pr_debug("Sent LACPDU on port %d\n",
1195                                          port->actor_port_number);
1196
1197                                 /* mark ntt as false, so it will not be sent
1198                                  * again until demanded
1199                                  */
1200                                 port->ntt = false;
1201                         }
1202                 }
1203                 /* restart tx timer(to verify that we will not exceed
1204                  * AD_MAX_TX_IN_SECOND
1205                  */
1206                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1207         }
1208 }
1209
1210 /**
1211  * ad_periodic_machine - handle a port's periodic state machine
1212  * @port: the port we're looking at
1213  *
1214  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1215  */
1216 static void ad_periodic_machine(struct port *port)
1217 {
1218         periodic_states_t last_state;
1219
1220         /* keep current state machine state to compare later if it was changed */
1221         last_state = port->sm_periodic_state;
1222
1223         /* check if port was reinitialized */
1224         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1225             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1226            ) {
1227                 port->sm_periodic_state = AD_NO_PERIODIC;
1228         }
1229         /* check if state machine should change state */
1230         else if (port->sm_periodic_timer_counter) {
1231                 /* check if periodic state machine expired */
1232                 if (!(--port->sm_periodic_timer_counter)) {
1233                         /* if expired then do tx */
1234                         port->sm_periodic_state = AD_PERIODIC_TX;
1235                 } else {
1236                         /* If not expired, check if there is some new timeout
1237                          * parameter from the partner state
1238                          */
1239                         switch (port->sm_periodic_state) {
1240                         case AD_FAST_PERIODIC:
1241                                 if (!(port->partner_oper.port_state
1242                                       & AD_STATE_LACP_TIMEOUT))
1243                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1244                                 break;
1245                         case AD_SLOW_PERIODIC:
1246                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1247                                         port->sm_periodic_timer_counter = 0;
1248                                         port->sm_periodic_state = AD_PERIODIC_TX;
1249                                 }
1250                                 break;
1251                         default:
1252                                 break;
1253                         }
1254                 }
1255         } else {
1256                 switch (port->sm_periodic_state) {
1257                 case AD_NO_PERIODIC:
1258                         port->sm_periodic_state = AD_FAST_PERIODIC;
1259                         break;
1260                 case AD_PERIODIC_TX:
1261                         if (!(port->partner_oper.port_state &
1262                             AD_STATE_LACP_TIMEOUT))
1263                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1264                         else
1265                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1266                         break;
1267                 default:
1268                         break;
1269                 }
1270         }
1271
1272         /* check if the state machine was changed */
1273         if (port->sm_periodic_state != last_state) {
1274                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1275                          port->actor_port_number, last_state,
1276                          port->sm_periodic_state);
1277                 switch (port->sm_periodic_state) {
1278                 case AD_NO_PERIODIC:
1279                         port->sm_periodic_timer_counter = 0;
1280                         break;
1281                 case AD_FAST_PERIODIC:
1282                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1283                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1284                         break;
1285                 case AD_SLOW_PERIODIC:
1286                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1287                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1288                         break;
1289                 case AD_PERIODIC_TX:
1290                         port->ntt = true;
1291                         break;
1292                 default:
1293                         break;
1294                 }
1295         }
1296 }
1297
1298 /**
1299  * ad_port_selection_logic - select aggregation groups
1300  * @port: the port we're looking at
1301  * @update_slave_arr: Does slave array need update?
1302  *
1303  * Select aggregation groups, and assign each port for it's aggregetor. The
1304  * selection logic is called in the inititalization (after all the handshkes),
1305  * and after every lacpdu receive (if selected is off).
1306  */
1307 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1308 {
1309         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1310         struct port *last_port = NULL, *curr_port;
1311         struct list_head *iter;
1312         struct bonding *bond;
1313         struct slave *slave;
1314         int found = 0;
1315
1316         /* if the port is already Selected, do nothing */
1317         if (port->sm_vars & AD_PORT_SELECTED)
1318                 return;
1319
1320         bond = __get_bond_by_port(port);
1321
1322         /* if the port is connected to other aggregator, detach it */
1323         if (port->aggregator) {
1324                 /* detach the port from its former aggregator */
1325                 temp_aggregator = port->aggregator;
1326                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1327                      last_port = curr_port,
1328                      curr_port = curr_port->next_port_in_aggregator) {
1329                         if (curr_port == port) {
1330                                 temp_aggregator->num_of_ports--;
1331                                 /* if it is the first port attached to the
1332                                  * aggregator
1333                                  */
1334                                 if (!last_port) {
1335                                         temp_aggregator->lag_ports =
1336                                                 port->next_port_in_aggregator;
1337                                 } else {
1338                                         /* not the first port attached to the
1339                                          * aggregator
1340                                          */
1341                                         last_port->next_port_in_aggregator =
1342                                                 port->next_port_in_aggregator;
1343                                 }
1344
1345                                 /* clear the port's relations to this
1346                                  * aggregator
1347                                  */
1348                                 port->aggregator = NULL;
1349                                 port->next_port_in_aggregator = NULL;
1350                                 port->actor_port_aggregator_identifier = 0;
1351
1352                                 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1353                                            port->actor_port_number,
1354                                            temp_aggregator->aggregator_identifier);
1355                                 /* if the aggregator is empty, clear its
1356                                  * parameters, and set it ready to be attached
1357                                  */
1358                                 if (!temp_aggregator->lag_ports)
1359                                         ad_clear_agg(temp_aggregator);
1360                                 break;
1361                         }
1362                 }
1363                 if (!curr_port) {
1364                         /* meaning: the port was related to an aggregator
1365                          * but was not on the aggregator port list
1366                          */
1367                         net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1368                                              port->slave->bond->dev->name,
1369                                              port->actor_port_number,
1370                                              port->slave->dev->name,
1371                                              port->aggregator->aggregator_identifier);
1372                 }
1373         }
1374         /* search on all aggregators for a suitable aggregator for this port */
1375         bond_for_each_slave(bond, slave, iter) {
1376                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1377
1378                 /* keep a free aggregator for later use(if needed) */
1379                 if (!aggregator->lag_ports) {
1380                         if (!free_aggregator)
1381                                 free_aggregator = aggregator;
1382                         continue;
1383                 }
1384                 /* check if current aggregator suits us */
1385                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1386                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1387                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1388                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1389                     ) &&
1390                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1391                       !aggregator->is_individual)  /* but is not individual OR */
1392                     )
1393                    ) {
1394                         /* attach to the founded aggregator */
1395                         port->aggregator = aggregator;
1396                         port->actor_port_aggregator_identifier =
1397                                 port->aggregator->aggregator_identifier;
1398                         port->next_port_in_aggregator = aggregator->lag_ports;
1399                         port->aggregator->num_of_ports++;
1400                         aggregator->lag_ports = port;
1401                         netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1402                                    port->actor_port_number,
1403                                    port->aggregator->aggregator_identifier);
1404
1405                         /* mark this port as selected */
1406                         port->sm_vars |= AD_PORT_SELECTED;
1407                         found = 1;
1408                         break;
1409                 }
1410         }
1411
1412         /* the port couldn't find an aggregator - attach it to a new
1413          * aggregator
1414          */
1415         if (!found) {
1416                 if (free_aggregator) {
1417                         /* assign port a new aggregator */
1418                         port->aggregator = free_aggregator;
1419                         port->actor_port_aggregator_identifier =
1420                                 port->aggregator->aggregator_identifier;
1421
1422                         /* update the new aggregator's parameters
1423                          * if port was responsed from the end-user
1424                          */
1425                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1426                                 /* if port is full duplex */
1427                                 port->aggregator->is_individual = false;
1428                         else
1429                                 port->aggregator->is_individual = true;
1430
1431                         port->aggregator->actor_admin_aggregator_key =
1432                                 port->actor_admin_port_key;
1433                         port->aggregator->actor_oper_aggregator_key =
1434                                 port->actor_oper_port_key;
1435                         port->aggregator->partner_system =
1436                                 port->partner_oper.system;
1437                         port->aggregator->partner_system_priority =
1438                                 port->partner_oper.system_priority;
1439                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1440                         port->aggregator->receive_state = 1;
1441                         port->aggregator->transmit_state = 1;
1442                         port->aggregator->lag_ports = port;
1443                         port->aggregator->num_of_ports++;
1444
1445                         /* mark this port as selected */
1446                         port->sm_vars |= AD_PORT_SELECTED;
1447
1448                         netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1449                                    port->actor_port_number,
1450                                    port->aggregator->aggregator_identifier);
1451                 } else {
1452                         netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1453                                port->actor_port_number, port->slave->dev->name);
1454                 }
1455         }
1456         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1457          * in all aggregator's ports, else set ready=FALSE in all
1458          * aggregator's ports
1459          */
1460         __set_agg_ports_ready(port->aggregator,
1461                               __agg_ports_are_ready(port->aggregator));
1462
1463         aggregator = __get_first_agg(port);
1464         ad_agg_selection_logic(aggregator, update_slave_arr);
1465
1466         if (!port->aggregator->is_active)
1467                 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1468 }
1469
1470 /* Decide if "agg" is a better choice for the new active aggregator that
1471  * the current best, according to the ad_select policy.
1472  */
1473 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1474                                                 struct aggregator *curr)
1475 {
1476         /* 0. If no best, select current.
1477          *
1478          * 1. If the current agg is not individual, and the best is
1479          *    individual, select current.
1480          *
1481          * 2. If current agg is individual and the best is not, keep best.
1482          *
1483          * 3. Therefore, current and best are both individual or both not
1484          *    individual, so:
1485          *
1486          * 3a. If current agg partner replied, and best agg partner did not,
1487          *     select current.
1488          *
1489          * 3b. If current agg partner did not reply and best agg partner
1490          *     did reply, keep best.
1491          *
1492          * 4.  Therefore, current and best both have partner replies or
1493          *     both do not, so perform selection policy:
1494          *
1495          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1496          *     select by bandwidth.
1497          *
1498          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1499          */
1500         if (!best)
1501                 return curr;
1502
1503         if (!curr->is_individual && best->is_individual)
1504                 return curr;
1505
1506         if (curr->is_individual && !best->is_individual)
1507                 return best;
1508
1509         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1510                 return curr;
1511
1512         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1513                 return best;
1514
1515         switch (__get_agg_selection_mode(curr->lag_ports)) {
1516         case BOND_AD_COUNT:
1517                 if (curr->num_of_ports > best->num_of_ports)
1518                         return curr;
1519
1520                 if (curr->num_of_ports < best->num_of_ports)
1521                         return best;
1522
1523                 /*FALLTHROUGH*/
1524         case BOND_AD_STABLE:
1525         case BOND_AD_BANDWIDTH:
1526                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1527                         return curr;
1528
1529                 break;
1530
1531         default:
1532                 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1533                                      curr->slave->bond->dev->name,
1534                                      __get_agg_selection_mode(curr->lag_ports));
1535                 break;
1536         }
1537
1538         return best;
1539 }
1540
1541 static int agg_device_up(const struct aggregator *agg)
1542 {
1543         struct port *port = agg->lag_ports;
1544
1545         if (!port)
1546                 return 0;
1547
1548         return netif_running(port->slave->dev) &&
1549                netif_carrier_ok(port->slave->dev);
1550 }
1551
1552 /**
1553  * ad_agg_selection_logic - select an aggregation group for a team
1554  * @aggregator: the aggregator we're looking at
1555  * @update_slave_arr: Does slave array need update?
1556  *
1557  * It is assumed that only one aggregator may be selected for a team.
1558  *
1559  * The logic of this function is to select the aggregator according to
1560  * the ad_select policy:
1561  *
1562  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1563  * it, and to reselect the active aggregator only if the previous
1564  * aggregator has no more ports related to it.
1565  *
1566  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1567  * bandwidth, and reselect whenever a link state change takes place or the
1568  * set of slaves in the bond changes.
1569  *
1570  * BOND_AD_COUNT: select the aggregator with largest number of ports
1571  * (slaves), and reselect whenever a link state change takes place or the
1572  * set of slaves in the bond changes.
1573  *
1574  * FIXME: this function MUST be called with the first agg in the bond, or
1575  * __get_active_agg() won't work correctly. This function should be better
1576  * called with the bond itself, and retrieve the first agg from it.
1577  */
1578 static void ad_agg_selection_logic(struct aggregator *agg,
1579                                    bool *update_slave_arr)
1580 {
1581         struct aggregator *best, *active, *origin;
1582         struct bonding *bond = agg->slave->bond;
1583         struct list_head *iter;
1584         struct slave *slave;
1585         struct port *port;
1586
1587         rcu_read_lock();
1588         origin = agg;
1589         active = __get_active_agg(agg);
1590         best = (active && agg_device_up(active)) ? active : NULL;
1591
1592         bond_for_each_slave_rcu(bond, slave, iter) {
1593                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1594
1595                 agg->is_active = 0;
1596
1597                 if (agg->num_of_ports && agg_device_up(agg))
1598                         best = ad_agg_selection_test(best, agg);
1599         }
1600
1601         if (best &&
1602             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1603                 /* For the STABLE policy, don't replace the old active
1604                  * aggregator if it's still active (it has an answering
1605                  * partner) or if both the best and active don't have an
1606                  * answering partner.
1607                  */
1608                 if (active && active->lag_ports &&
1609                     active->lag_ports->is_enabled &&
1610                     (__agg_has_partner(active) ||
1611                      (!__agg_has_partner(active) &&
1612                      !__agg_has_partner(best)))) {
1613                         if (!(!active->actor_oper_aggregator_key &&
1614                               best->actor_oper_aggregator_key)) {
1615                                 best = NULL;
1616                                 active->is_active = 1;
1617                         }
1618                 }
1619         }
1620
1621         if (best && (best == active)) {
1622                 best = NULL;
1623                 active->is_active = 1;
1624         }
1625
1626         /* if there is new best aggregator, activate it */
1627         if (best) {
1628                 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1629                            best->aggregator_identifier, best->num_of_ports,
1630                            best->actor_oper_aggregator_key,
1631                            best->partner_oper_aggregator_key,
1632                            best->is_individual, best->is_active);
1633                 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1634                            best->lag_ports, best->slave,
1635                            best->slave ? best->slave->dev->name : "NULL");
1636
1637                 bond_for_each_slave_rcu(bond, slave, iter) {
1638                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1639
1640                         netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1641                                    agg->aggregator_identifier, agg->num_of_ports,
1642                                    agg->actor_oper_aggregator_key,
1643                                    agg->partner_oper_aggregator_key,
1644                                    agg->is_individual, agg->is_active);
1645                 }
1646
1647                 /* check if any partner replys */
1648                 if (best->is_individual) {
1649                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1650                                              best->slave ?
1651                                              best->slave->bond->dev->name : "NULL");
1652                 }
1653
1654                 best->is_active = 1;
1655                 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1656                            best->aggregator_identifier);
1657                 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1658                            best->aggregator_identifier, best->num_of_ports,
1659                            best->actor_oper_aggregator_key,
1660                            best->partner_oper_aggregator_key,
1661                            best->is_individual, best->is_active);
1662
1663                 /* disable the ports that were related to the former
1664                  * active_aggregator
1665                  */
1666                 if (active) {
1667                         for (port = active->lag_ports; port;
1668                              port = port->next_port_in_aggregator) {
1669                                 __disable_port(port);
1670                         }
1671                 }
1672                 /* Slave array needs update. */
1673                 *update_slave_arr = true;
1674         }
1675
1676         /* if the selected aggregator is of join individuals
1677          * (partner_system is NULL), enable their ports
1678          */
1679         active = __get_active_agg(origin);
1680
1681         if (active) {
1682                 if (!__agg_has_partner(active)) {
1683                         for (port = active->lag_ports; port;
1684                              port = port->next_port_in_aggregator) {
1685                                 __enable_port(port);
1686                         }
1687                 }
1688         }
1689
1690         rcu_read_unlock();
1691
1692         bond_3ad_set_carrier(bond);
1693 }
1694
1695 /**
1696  * ad_clear_agg - clear a given aggregator's parameters
1697  * @aggregator: the aggregator we're looking at
1698  */
1699 static void ad_clear_agg(struct aggregator *aggregator)
1700 {
1701         if (aggregator) {
1702                 aggregator->is_individual = false;
1703                 aggregator->actor_admin_aggregator_key = 0;
1704                 aggregator->actor_oper_aggregator_key = 0;
1705                 aggregator->partner_system = null_mac_addr;
1706                 aggregator->partner_system_priority = 0;
1707                 aggregator->partner_oper_aggregator_key = 0;
1708                 aggregator->receive_state = 0;
1709                 aggregator->transmit_state = 0;
1710                 aggregator->lag_ports = NULL;
1711                 aggregator->is_active = 0;
1712                 aggregator->num_of_ports = 0;
1713                 pr_debug("LAG %d was cleared\n",
1714                          aggregator->aggregator_identifier);
1715         }
1716 }
1717
1718 /**
1719  * ad_initialize_agg - initialize a given aggregator's parameters
1720  * @aggregator: the aggregator we're looking at
1721  */
1722 static void ad_initialize_agg(struct aggregator *aggregator)
1723 {
1724         if (aggregator) {
1725                 ad_clear_agg(aggregator);
1726
1727                 aggregator->aggregator_mac_address = null_mac_addr;
1728                 aggregator->aggregator_identifier = 0;
1729                 aggregator->slave = NULL;
1730         }
1731 }
1732
1733 /**
1734  * ad_initialize_port - initialize a given port's parameters
1735  * @aggregator: the aggregator we're looking at
1736  * @lacp_fast: boolean. whether fast periodic should be used
1737  */
1738 static void ad_initialize_port(struct port *port, int lacp_fast)
1739 {
1740         static const struct port_params tmpl = {
1741                 .system_priority = 0xffff,
1742                 .key             = 1,
1743                 .port_number     = 1,
1744                 .port_priority   = 0xff,
1745                 .port_state      = 1,
1746         };
1747         static const struct lacpdu lacpdu = {
1748                 .subtype                = 0x01,
1749                 .version_number = 0x01,
1750                 .tlv_type_actor_info = 0x01,
1751                 .actor_information_length = 0x14,
1752                 .tlv_type_partner_info = 0x02,
1753                 .partner_information_length = 0x14,
1754                 .tlv_type_collector_info = 0x03,
1755                 .collector_information_length = 0x10,
1756                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1757         };
1758
1759         if (port) {
1760                 port->actor_port_priority = 0xff;
1761                 port->actor_port_aggregator_identifier = 0;
1762                 port->ntt = false;
1763                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1764                                                AD_STATE_LACP_ACTIVITY;
1765                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1766                                                AD_STATE_LACP_ACTIVITY;
1767
1768                 if (lacp_fast)
1769                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1770
1771                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1772                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1773
1774                 port->is_enabled = true;
1775                 /* private parameters */
1776                 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1777                 port->sm_rx_state = 0;
1778                 port->sm_rx_timer_counter = 0;
1779                 port->sm_periodic_state = 0;
1780                 port->sm_periodic_timer_counter = 0;
1781                 port->sm_mux_state = 0;
1782                 port->sm_mux_timer_counter = 0;
1783                 port->sm_tx_state = 0;
1784                 port->aggregator = NULL;
1785                 port->next_port_in_aggregator = NULL;
1786                 port->transaction_id = 0;
1787
1788                 port->sm_churn_actor_timer_counter = 0;
1789                 port->sm_churn_actor_state = 0;
1790                 port->churn_actor_count = 0;
1791                 port->sm_churn_partner_timer_counter = 0;
1792                 port->sm_churn_partner_state = 0;
1793                 port->churn_partner_count = 0;
1794
1795                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1796         }
1797 }
1798
1799 /**
1800  * ad_enable_collecting_distributing - enable a port's transmit/receive
1801  * @port: the port we're looking at
1802  * @update_slave_arr: Does slave array need update?
1803  *
1804  * Enable @port if it's in an active aggregator
1805  */
1806 static void ad_enable_collecting_distributing(struct port *port,
1807                                               bool *update_slave_arr)
1808 {
1809         if (port->aggregator->is_active) {
1810                 pr_debug("Enabling port %d(LAG %d)\n",
1811                          port->actor_port_number,
1812                          port->aggregator->aggregator_identifier);
1813                 __enable_port(port);
1814                 /* Slave array needs update */
1815                 *update_slave_arr = true;
1816         }
1817 }
1818
1819 /**
1820  * ad_disable_collecting_distributing - disable a port's transmit/receive
1821  * @port: the port we're looking at
1822  * @update_slave_arr: Does slave array need update?
1823  */
1824 static void ad_disable_collecting_distributing(struct port *port,
1825                                                bool *update_slave_arr)
1826 {
1827         if (port->aggregator &&
1828             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1829                                &(null_mac_addr))) {
1830                 pr_debug("Disabling port %d(LAG %d)\n",
1831                          port->actor_port_number,
1832                          port->aggregator->aggregator_identifier);
1833                 __disable_port(port);
1834                 /* Slave array needs an update */
1835                 *update_slave_arr = true;
1836         }
1837 }
1838
1839 /**
1840  * ad_marker_info_received - handle receive of a Marker information frame
1841  * @marker_info: Marker info received
1842  * @port: the port we're looking at
1843  */
1844 static void ad_marker_info_received(struct bond_marker *marker_info,
1845         struct port *port)
1846 {
1847         struct bond_marker marker;
1848
1849         /* copy the received marker data to the response marker */
1850         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1851         /* change the marker subtype to marker response */
1852         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1853
1854         /* send the marker response */
1855         if (ad_marker_send(port, &marker) >= 0) {
1856                 pr_debug("Sent Marker Response on port %d\n",
1857                          port->actor_port_number);
1858         }
1859 }
1860
1861 /**
1862  * ad_marker_response_received - handle receive of a marker response frame
1863  * @marker: marker PDU received
1864  * @port: the port we're looking at
1865  *
1866  * This function does nothing since we decided not to implement send and handle
1867  * response for marker PDU's, in this stage, but only to respond to marker
1868  * information.
1869  */
1870 static void ad_marker_response_received(struct bond_marker *marker,
1871                                         struct port *port)
1872 {
1873         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1874 }
1875
1876 /* ========= AD exported functions to the main bonding code ========= */
1877
1878 /* Check aggregators status in team every T seconds */
1879 #define AD_AGGREGATOR_SELECTION_TIMER  8
1880
1881 /**
1882  * bond_3ad_initiate_agg_selection - initate aggregator selection
1883  * @bond: bonding struct
1884  *
1885  * Set the aggregation selection timer, to initiate an agg selection in
1886  * the very near future.  Called during first initialization, and during
1887  * any down to up transitions of the bond.
1888  */
1889 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1890 {
1891         BOND_AD_INFO(bond).agg_select_timer = timeout;
1892 }
1893
1894 /**
1895  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1896  * @bond: bonding struct to work on
1897  * @tick_resolution: tick duration (millisecond resolution)
1898  *
1899  * Can be called only after the mac address of the bond is set.
1900  */
1901 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1902 {
1903         /* check that the bond is not initialized yet */
1904         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1905                                 bond->dev->dev_addr)) {
1906
1907                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1908
1909                 BOND_AD_INFO(bond).system.sys_priority =
1910                         bond->params.ad_actor_sys_prio;
1911                 if (is_zero_ether_addr(bond->params.ad_actor_system))
1912                         BOND_AD_INFO(bond).system.sys_mac_addr =
1913                             *((struct mac_addr *)bond->dev->dev_addr);
1914                 else
1915                         BOND_AD_INFO(bond).system.sys_mac_addr =
1916                             *((struct mac_addr *)bond->params.ad_actor_system);
1917
1918                 /* initialize how many times this module is called in one
1919                  * second (should be about every 100ms)
1920                  */
1921                 ad_ticks_per_sec = tick_resolution;
1922
1923                 bond_3ad_initiate_agg_selection(bond,
1924                                                 AD_AGGREGATOR_SELECTION_TIMER *
1925                                                 ad_ticks_per_sec);
1926         }
1927 }
1928
1929 /**
1930  * bond_3ad_bind_slave - initialize a slave's port
1931  * @slave: slave struct to work on
1932  *
1933  * Returns:   0 on success
1934  *          < 0 on error
1935  */
1936 void bond_3ad_bind_slave(struct slave *slave)
1937 {
1938         struct bonding *bond = bond_get_bond_by_slave(slave);
1939         struct port *port;
1940         struct aggregator *aggregator;
1941
1942         /* check that the slave has not been initialized yet. */
1943         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1944
1945                 /* port initialization */
1946                 port = &(SLAVE_AD_INFO(slave)->port);
1947
1948                 ad_initialize_port(port, bond->params.lacp_fast);
1949
1950                 port->slave = slave;
1951                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
1952                 /* key is determined according to the link speed, duplex and
1953                  * user key
1954                  */
1955                 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
1956                 port->actor_admin_port_key |= __get_duplex(port);
1957                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1958                 port->actor_oper_port_key = port->actor_admin_port_key;
1959                 /* if the port is not full duplex, then the port should be not
1960                  * lacp Enabled
1961                  */
1962                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1963                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1964                 /* actor system is the bond's system */
1965                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1966                 port->actor_system_priority =
1967                     BOND_AD_INFO(bond).system.sys_priority;
1968                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1969                  * lacpdu's are sent in one second)
1970                  */
1971                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1972
1973                 __disable_port(port);
1974
1975                 /* aggregator initialization */
1976                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1977
1978                 ad_initialize_agg(aggregator);
1979
1980                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1981                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1982                 aggregator->slave = slave;
1983                 aggregator->is_active = 0;
1984                 aggregator->num_of_ports = 0;
1985         }
1986 }
1987
1988 /**
1989  * bond_3ad_unbind_slave - deinitialize a slave's port
1990  * @slave: slave struct to work on
1991  *
1992  * Search for the aggregator that is related to this port, remove the
1993  * aggregator and assign another aggregator for other port related to it
1994  * (if any), and remove the port.
1995  */
1996 void bond_3ad_unbind_slave(struct slave *slave)
1997 {
1998         struct port *port, *prev_port, *temp_port;
1999         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2000         int select_new_active_agg = 0;
2001         struct bonding *bond = slave->bond;
2002         struct slave *slave_iter;
2003         struct list_head *iter;
2004         bool dummy_slave_update; /* Ignore this value as caller updates array */
2005
2006         /* Sync against bond_3ad_state_machine_handler() */
2007         spin_lock_bh(&bond->mode_lock);
2008         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2009         port = &(SLAVE_AD_INFO(slave)->port);
2010
2011         /* if slave is null, the whole port is not initialized */
2012         if (!port->slave) {
2013                 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
2014                             slave->dev->name);
2015                 goto out;
2016         }
2017
2018         netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
2019                    aggregator->aggregator_identifier);
2020
2021         /* Tell the partner that this port is not suitable for aggregation */
2022         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2023         __update_lacpdu_from_port(port);
2024         ad_lacpdu_send(port);
2025
2026         /* check if this aggregator is occupied */
2027         if (aggregator->lag_ports) {
2028                 /* check if there are other ports related to this aggregator
2029                  * except the port related to this slave(thats ensure us that
2030                  * there is a reason to search for new aggregator, and that we
2031                  * will find one
2032                  */
2033                 if ((aggregator->lag_ports != port) ||
2034                     (aggregator->lag_ports->next_port_in_aggregator)) {
2035                         /* find new aggregator for the related port(s) */
2036                         bond_for_each_slave(bond, slave_iter, iter) {
2037                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2038                                 /* if the new aggregator is empty, or it is
2039                                  * connected to our port only
2040                                  */
2041                                 if (!new_aggregator->lag_ports ||
2042                                     ((new_aggregator->lag_ports == port) &&
2043                                      !new_aggregator->lag_ports->next_port_in_aggregator))
2044                                         break;
2045                         }
2046                         if (!slave_iter)
2047                                 new_aggregator = NULL;
2048
2049                         /* if new aggregator found, copy the aggregator's
2050                          * parameters and connect the related lag_ports to the
2051                          * new aggregator
2052                          */
2053                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2054                                 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2055                                            aggregator->aggregator_identifier,
2056                                            new_aggregator->aggregator_identifier);
2057
2058                                 if ((new_aggregator->lag_ports == port) &&
2059                                     new_aggregator->is_active) {
2060                                         netdev_info(bond->dev, "Removing an active aggregator\n");
2061                                          select_new_active_agg = 1;
2062                                 }
2063
2064                                 new_aggregator->is_individual = aggregator->is_individual;
2065                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2066                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2067                                 new_aggregator->partner_system = aggregator->partner_system;
2068                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2069                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2070                                 new_aggregator->receive_state = aggregator->receive_state;
2071                                 new_aggregator->transmit_state = aggregator->transmit_state;
2072                                 new_aggregator->lag_ports = aggregator->lag_ports;
2073                                 new_aggregator->is_active = aggregator->is_active;
2074                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2075
2076                                 /* update the information that is written on
2077                                  * the ports about the aggregator
2078                                  */
2079                                 for (temp_port = aggregator->lag_ports; temp_port;
2080                                      temp_port = temp_port->next_port_in_aggregator) {
2081                                         temp_port->aggregator = new_aggregator;
2082                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2083                                 }
2084
2085                                 ad_clear_agg(aggregator);
2086
2087                                 if (select_new_active_agg)
2088                                         ad_agg_selection_logic(__get_first_agg(port),
2089                                                                &dummy_slave_update);
2090                         } else {
2091                                 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2092                         }
2093                 } else {
2094                         /* in case that the only port related to this
2095                          * aggregator is the one we want to remove
2096                          */
2097                         select_new_active_agg = aggregator->is_active;
2098                         ad_clear_agg(aggregator);
2099                         if (select_new_active_agg) {
2100                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2101                                 /* select new active aggregator */
2102                                 temp_aggregator = __get_first_agg(port);
2103                                 if (temp_aggregator)
2104                                         ad_agg_selection_logic(temp_aggregator,
2105                                                                &dummy_slave_update);
2106                         }
2107                 }
2108         }
2109
2110         netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
2111
2112         /* find the aggregator that this port is connected to */
2113         bond_for_each_slave(bond, slave_iter, iter) {
2114                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2115                 prev_port = NULL;
2116                 /* search the port in the aggregator's related ports */
2117                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2118                      prev_port = temp_port,
2119                      temp_port = temp_port->next_port_in_aggregator) {
2120                         if (temp_port == port) {
2121                                 /* the aggregator found - detach the port from
2122                                  * this aggregator
2123                                  */
2124                                 if (prev_port)
2125                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2126                                 else
2127                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2128                                 temp_aggregator->num_of_ports--;
2129                                 if (temp_aggregator->num_of_ports == 0) {
2130                                         select_new_active_agg = temp_aggregator->is_active;
2131                                         ad_clear_agg(temp_aggregator);
2132                                         if (select_new_active_agg) {
2133                                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2134                                                 /* select new active aggregator */
2135                                                 ad_agg_selection_logic(__get_first_agg(port),
2136                                                                        &dummy_slave_update);
2137                                         }
2138                                 }
2139                                 break;
2140                         }
2141                 }
2142         }
2143         port->slave = NULL;
2144
2145 out:
2146         spin_unlock_bh(&bond->mode_lock);
2147 }
2148
2149 /**
2150  * bond_3ad_state_machine_handler - handle state machines timeout
2151  * @bond: bonding struct to work on
2152  *
2153  * The state machine handling concept in this module is to check every tick
2154  * which state machine should operate any function. The execution order is
2155  * round robin, so when we have an interaction between state machines, the
2156  * reply of one to each other might be delayed until next tick.
2157  *
2158  * This function also complete the initialization when the agg_select_timer
2159  * times out, and it selects an aggregator for the ports that are yet not
2160  * related to any aggregator, and selects the active aggregator for a bond.
2161  */
2162 void bond_3ad_state_machine_handler(struct work_struct *work)
2163 {
2164         struct bonding *bond = container_of(work, struct bonding,
2165                                             ad_work.work);
2166         struct aggregator *aggregator;
2167         struct list_head *iter;
2168         struct slave *slave;
2169         struct port *port;
2170         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2171         bool update_slave_arr = false;
2172
2173         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2174          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2175          * concurrently due to incoming LACPDU as well.
2176          */
2177         spin_lock_bh(&bond->mode_lock);
2178         rcu_read_lock();
2179
2180         /* check if there are any slaves */
2181         if (!bond_has_slaves(bond))
2182                 goto re_arm;
2183
2184         /* check if agg_select_timer timer after initialize is timed out */
2185         if (BOND_AD_INFO(bond).agg_select_timer &&
2186             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2187                 slave = bond_first_slave_rcu(bond);
2188                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2189
2190                 /* select the active aggregator for the bond */
2191                 if (port) {
2192                         if (!port->slave) {
2193                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2194                                                      bond->dev->name);
2195                                 goto re_arm;
2196                         }
2197
2198                         aggregator = __get_first_agg(port);
2199                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2200                 }
2201                 bond_3ad_set_carrier(bond);
2202         }
2203
2204         /* for each port run the state machines */
2205         bond_for_each_slave_rcu(bond, slave, iter) {
2206                 port = &(SLAVE_AD_INFO(slave)->port);
2207                 if (!port->slave) {
2208                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2209                                             bond->dev->name);
2210                         goto re_arm;
2211                 }
2212
2213                 ad_rx_machine(NULL, port);
2214                 ad_periodic_machine(port);
2215                 ad_port_selection_logic(port, &update_slave_arr);
2216                 ad_mux_machine(port, &update_slave_arr);
2217                 ad_tx_machine(port);
2218                 ad_churn_machine(port);
2219
2220                 /* turn off the BEGIN bit, since we already handled it */
2221                 if (port->sm_vars & AD_PORT_BEGIN)
2222                         port->sm_vars &= ~AD_PORT_BEGIN;
2223         }
2224
2225 re_arm:
2226         bond_for_each_slave_rcu(bond, slave, iter) {
2227                 if (slave->should_notify) {
2228                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2229                         break;
2230                 }
2231         }
2232         rcu_read_unlock();
2233         spin_unlock_bh(&bond->mode_lock);
2234
2235         if (update_slave_arr)
2236                 bond_slave_arr_work_rearm(bond, 0);
2237
2238         if (should_notify_rtnl && rtnl_trylock()) {
2239                 bond_slave_state_notify(bond);
2240                 rtnl_unlock();
2241         }
2242         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2243 }
2244
2245 /**
2246  * bond_3ad_rx_indication - handle a received frame
2247  * @lacpdu: received lacpdu
2248  * @slave: slave struct to work on
2249  * @length: length of the data received
2250  *
2251  * It is assumed that frames that were sent on this NIC don't returned as new
2252  * received frames (loopback). Since only the payload is given to this
2253  * function, it check for loopback.
2254  */
2255 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2256                                   u16 length)
2257 {
2258         struct port *port;
2259         int ret = RX_HANDLER_ANOTHER;
2260
2261         if (length >= sizeof(struct lacpdu)) {
2262
2263                 port = &(SLAVE_AD_INFO(slave)->port);
2264
2265                 if (!port->slave) {
2266                         net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2267                                              slave->dev->name, slave->bond->dev->name);
2268                         return ret;
2269                 }
2270
2271                 switch (lacpdu->subtype) {
2272                 case AD_TYPE_LACPDU:
2273                         ret = RX_HANDLER_CONSUMED;
2274                         netdev_dbg(slave->bond->dev,
2275                                    "Received LACPDU on port %d slave %s\n",
2276                                    port->actor_port_number,
2277                                    slave->dev->name);
2278                         /* Protect against concurrent state machines */
2279                         spin_lock(&slave->bond->mode_lock);
2280                         ad_rx_machine(lacpdu, port);
2281                         spin_unlock(&slave->bond->mode_lock);
2282                         break;
2283
2284                 case AD_TYPE_MARKER:
2285                         ret = RX_HANDLER_CONSUMED;
2286                         /* No need to convert fields to Little Endian since we
2287                          * don't use the marker's fields.
2288                          */
2289
2290                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2291                         case AD_MARKER_INFORMATION_SUBTYPE:
2292                                 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2293                                            port->actor_port_number);
2294                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2295                                 break;
2296
2297                         case AD_MARKER_RESPONSE_SUBTYPE:
2298                                 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2299                                            port->actor_port_number);
2300                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2301                                 break;
2302
2303                         default:
2304                                 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2305                                            port->actor_port_number);
2306                         }
2307                 }
2308         }
2309         return ret;
2310 }
2311
2312 /**
2313  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2314  * @slave: slave struct to work on
2315  *
2316  * Handle reselection of aggregator (if needed) for this port.
2317  */
2318 void bond_3ad_adapter_speed_changed(struct slave *slave)
2319 {
2320         struct port *port;
2321
2322         port = &(SLAVE_AD_INFO(slave)->port);
2323
2324         /* if slave is null, the whole port is not initialized */
2325         if (!port->slave) {
2326                 netdev_warn(slave->bond->dev, "speed changed for uninitialized port on %s\n",
2327                             slave->dev->name);
2328                 return;
2329         }
2330
2331         spin_lock_bh(&slave->bond->mode_lock);
2332
2333         port->actor_admin_port_key &= ~AD_SPEED_KEY_MASKS;
2334         port->actor_admin_port_key |= __get_link_speed(port) << 1;
2335         port->actor_oper_port_key = port->actor_admin_port_key;
2336         netdev_dbg(slave->bond->dev, "Port %d changed speed\n", port->actor_port_number);
2337         /* there is no need to reselect a new aggregator, just signal the
2338          * state machines to reinitialize
2339          */
2340         port->sm_vars |= AD_PORT_BEGIN;
2341
2342         spin_unlock_bh(&slave->bond->mode_lock);
2343 }
2344
2345 /**
2346  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2347  * @slave: slave struct to work on
2348  *
2349  * Handle reselection of aggregator (if needed) for this port.
2350  */
2351 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2352 {
2353         struct port *port;
2354
2355         port = &(SLAVE_AD_INFO(slave)->port);
2356
2357         /* if slave is null, the whole port is not initialized */
2358         if (!port->slave) {
2359                 netdev_warn(slave->bond->dev, "duplex changed for uninitialized port on %s\n",
2360                             slave->dev->name);
2361                 return;
2362         }
2363
2364         spin_lock_bh(&slave->bond->mode_lock);
2365
2366         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_MASKS;
2367         port->actor_admin_port_key |= __get_duplex(port);
2368         port->actor_oper_port_key = port->actor_admin_port_key;
2369         netdev_dbg(slave->bond->dev, "Port %d slave %s changed duplex\n",
2370                    port->actor_port_number, slave->dev->name);
2371         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
2372                 port->sm_vars |= AD_PORT_LACP_ENABLED;
2373         /* there is no need to reselect a new aggregator, just signal the
2374          * state machines to reinitialize
2375          */
2376         port->sm_vars |= AD_PORT_BEGIN;
2377
2378         spin_unlock_bh(&slave->bond->mode_lock);
2379 }
2380
2381 /**
2382  * bond_3ad_handle_link_change - handle a slave's link status change indication
2383  * @slave: slave struct to work on
2384  * @status: whether the link is now up or down
2385  *
2386  * Handle reselection of aggregator (if needed) for this port.
2387  */
2388 void bond_3ad_handle_link_change(struct slave *slave, char link)
2389 {
2390         struct port *port;
2391
2392         port = &(SLAVE_AD_INFO(slave)->port);
2393
2394         /* if slave is null, the whole port is not initialized */
2395         if (!port->slave) {
2396                 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2397                             slave->dev->name);
2398                 return;
2399         }
2400
2401         spin_lock_bh(&slave->bond->mode_lock);
2402         /* on link down we are zeroing duplex and speed since
2403          * some of the adaptors(ce1000.lan) report full duplex/speed
2404          * instead of N/A(duplex) / 0(speed).
2405          *
2406          * on link up we are forcing recheck on the duplex and speed since
2407          * some of he adaptors(ce1000.lan) report.
2408          */
2409         port->actor_admin_port_key &= ~(AD_DUPLEX_KEY_MASKS|AD_SPEED_KEY_MASKS);
2410         if (link == BOND_LINK_UP) {
2411                 port->is_enabled = true;
2412                 port->actor_admin_port_key |=
2413                         (__get_link_speed(port) << 1) | __get_duplex(port);
2414                 if (port->actor_admin_port_key & AD_DUPLEX_KEY_MASKS)
2415                         port->sm_vars |= AD_PORT_LACP_ENABLED;
2416         } else {
2417                 /* link has failed */
2418                 port->is_enabled = false;
2419                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2420         }
2421         port->actor_oper_port_key = port->actor_admin_port_key;
2422         netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2423                    port->actor_port_number,
2424                    link == BOND_LINK_UP ? "UP" : "DOWN");
2425         /* there is no need to reselect a new aggregator, just signal the
2426          * state machines to reinitialize
2427          */
2428         port->sm_vars |= AD_PORT_BEGIN;
2429
2430         spin_unlock_bh(&slave->bond->mode_lock);
2431
2432         /* RTNL is held and mode_lock is released so it's safe
2433          * to update slave_array here.
2434          */
2435         bond_update_slave_arr(slave->bond, NULL);
2436 }
2437
2438 /**
2439  * bond_3ad_set_carrier - set link state for bonding master
2440  * @bond - bonding structure
2441  *
2442  * if we have an active aggregator, we're up, if not, we're down.
2443  * Presumes that we cannot have an active aggregator if there are
2444  * no slaves with link up.
2445  *
2446  * This behavior complies with IEEE 802.3 section 43.3.9.
2447  *
2448  * Called by bond_set_carrier(). Return zero if carrier state does not
2449  * change, nonzero if it does.
2450  */
2451 int bond_3ad_set_carrier(struct bonding *bond)
2452 {
2453         struct aggregator *active;
2454         struct slave *first_slave;
2455         int ret = 1;
2456
2457         rcu_read_lock();
2458         first_slave = bond_first_slave_rcu(bond);
2459         if (!first_slave) {
2460                 ret = 0;
2461                 goto out;
2462         }
2463         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2464         if (active) {
2465                 /* are enough slaves available to consider link up? */
2466                 if (active->num_of_ports < bond->params.min_links) {
2467                         if (netif_carrier_ok(bond->dev)) {
2468                                 netif_carrier_off(bond->dev);
2469                                 goto out;
2470                         }
2471                 } else if (!netif_carrier_ok(bond->dev)) {
2472                         netif_carrier_on(bond->dev);
2473                         goto out;
2474                 }
2475         } else if (netif_carrier_ok(bond->dev)) {
2476                 netif_carrier_off(bond->dev);
2477         }
2478 out:
2479         rcu_read_unlock();
2480         return ret;
2481 }
2482
2483 /**
2484  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2485  * @bond: bonding struct to work on
2486  * @ad_info: ad_info struct to fill with the bond's info
2487  *
2488  * Returns:   0 on success
2489  *          < 0 on error
2490  */
2491 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2492                                    struct ad_info *ad_info)
2493 {
2494         struct aggregator *aggregator = NULL;
2495         struct list_head *iter;
2496         struct slave *slave;
2497         struct port *port;
2498
2499         bond_for_each_slave_rcu(bond, slave, iter) {
2500                 port = &(SLAVE_AD_INFO(slave)->port);
2501                 if (port->aggregator && port->aggregator->is_active) {
2502                         aggregator = port->aggregator;
2503                         break;
2504                 }
2505         }
2506
2507         if (!aggregator)
2508                 return -1;
2509
2510         ad_info->aggregator_id = aggregator->aggregator_identifier;
2511         ad_info->ports = aggregator->num_of_ports;
2512         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2513         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2514         ether_addr_copy(ad_info->partner_system,
2515                         aggregator->partner_system.mac_addr_value);
2516         return 0;
2517 }
2518
2519 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2520 {
2521         int ret;
2522
2523         rcu_read_lock();
2524         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2525         rcu_read_unlock();
2526
2527         return ret;
2528 }
2529
2530 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2531                          struct slave *slave)
2532 {
2533         struct lacpdu *lacpdu, _lacpdu;
2534
2535         if (skb->protocol != PKT_TYPE_LACPDU)
2536                 return RX_HANDLER_ANOTHER;
2537
2538         if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2539                 return RX_HANDLER_ANOTHER;
2540
2541         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2542         if (!lacpdu)
2543                 return RX_HANDLER_ANOTHER;
2544
2545         return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2546 }
2547
2548 /**
2549  * bond_3ad_update_lacp_rate - change the lacp rate
2550  * @bond - bonding struct
2551  *
2552  * When modify lacp_rate parameter via sysfs,
2553  * update actor_oper_port_state of each port.
2554  *
2555  * Hold bond->mode_lock,
2556  * so we can modify port->actor_oper_port_state,
2557  * no matter bond is up or down.
2558  */
2559 void bond_3ad_update_lacp_rate(struct bonding *bond)
2560 {
2561         struct port *port = NULL;
2562         struct list_head *iter;
2563         struct slave *slave;
2564         int lacp_fast;
2565
2566         lacp_fast = bond->params.lacp_fast;
2567         spin_lock_bh(&bond->mode_lock);
2568         bond_for_each_slave(bond, slave, iter) {
2569                 port = &(SLAVE_AD_INFO(slave)->port);
2570                 if (lacp_fast)
2571                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2572                 else
2573                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2574         }
2575         spin_unlock_bh(&bond->mode_lock);
2576 }