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
  74 /* Port Key definitions
  75  * key is determined according to the link speed, duplex and
  76  * user key (which is yet not supported)
  77  * --------------------------------------------------------------
  78  * Port key :   | User key      | Speed         | Duplex        |
  79  * --------------------------------------------------------------
  80  * 16             6               1               0
  81  */
  82 #define  AD_DUPLEX_KEY_MASKS    0x1
  83 #define  AD_SPEED_KEY_MASKS     0x3E
  84 #define  AD_USER_KEY_MASKS      0xFFC0
  85
  86 enum ad_link_speed_type {
  87         AD_LINK_SPEED_1MBPS = 1,
  88         AD_LINK_SPEED_10MBPS,
  89         AD_LINK_SPEED_100MBPS,
  90         AD_LINK_SPEED_1000MBPS,
  91         AD_LINK_SPEED_2500MBPS,
  92         AD_LINK_SPEED_10000MBPS,
  93         AD_LINK_SPEED_20000MBPS,
  94         AD_LINK_SPEED_40000MBPS,
  95         AD_LINK_SPEED_56000MBPS
  96 };
  97
  98 /* compare MAC addresses */
  99 #define MAC_ADDRESS_EQUAL(A, B) \
 100         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
 101
 102 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
 103 static u16 ad_ticks_per_sec;
 104 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
 105
 106 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 107
 108 /* ================= main 802.3ad protocol functions ================== */
 109 static int ad_lacpdu_send(struct port *port);
 110 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 111 static void ad_mux_machine(struct port *port, bool *update_slave_arr);
 112 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 113 static void ad_tx_machine(struct port *port);
 114 static void ad_periodic_machine(struct port *port);
 115 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
 116 static void ad_agg_selection_logic(struct aggregator *aggregator,
 117                                    bool *update_slave_arr);
 118 static void ad_clear_agg(struct aggregator *aggregator);
 119 static void ad_initialize_agg(struct aggregator *aggregator);
 120 static void ad_initialize_port(struct port *port, int lacp_fast);
 121 static void ad_enable_collecting_distributing(struct port *port,
 122                                               bool *update_slave_arr);
 123 static void ad_disable_collecting_distributing(struct port *port,
 124                                                bool *update_slave_arr);
 125 static void ad_marker_info_received(struct bond_marker *marker_info,
 126                                     struct port *port);
 127 static void ad_marker_response_received(struct bond_marker *marker,
 128                                         struct port *port);
 129
 130
 131 /* ================= api to bonding and kernel code ================== */
 132
 133 /**
 134  * __get_bond_by_port - get the port's bonding struct
 135  * @port: the port we're looking at
 136  *
 137  * Return @port's bonding struct, or %NULL if it can't be found.
 138  */
 139 static inline struct bonding *__get_bond_by_port(struct port *port)
 140 {
 141         if (port->slave == NULL)
 142                 return NULL;
 143
 144         return bond_get_bond_by_slave(port->slave);
 145 }
 146
 147 /**
 148  * __get_first_agg - get the first aggregator in the bond
 149  * @bond: the bond we're looking at
 150  *
 151  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 152  * found.
 153  * The caller must hold RCU or RTNL lock.
 154  */
 155 static inline struct aggregator *__get_first_agg(struct port *port)
 156 {
 157         struct bonding *bond = __get_bond_by_port(port);
 158         struct slave *first_slave;
 159         struct aggregator *agg;
 160
 161         /* If there's no bond for this port, or bond has no slaves */
 162         if (bond == NULL)
 163                 return NULL;
 164
 165         rcu_read_lock();
 166         first_slave = bond_first_slave_rcu(bond);
 167         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 168         rcu_read_unlock();
 169
 170         return agg;
 171 }
 172
 173 /**
 174  * __agg_has_partner - see if we have a partner
 175  * @agg: the agregator we're looking at
 176  *
 177  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 178  * address for the partner). Return 0 if not.
 179  */
 180 static inline int __agg_has_partner(struct aggregator *agg)
 181 {
 182         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 183 }
 184
 185 /**
 186  * __disable_port - disable the port's slave
 187  * @port: the port we're looking at
 188  */
 189 static inline void __disable_port(struct port *port)
 190 {
 191         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 192 }
 193
 194 /**
 195  * __enable_port - enable the port's slave, if it's up
 196  * @port: the port we're looking at
 197  */
 198 static inline void __enable_port(struct port *port)
 199 {
 200         struct slave *slave = port->slave;
 201
 202         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 203                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 204 }
 205
 206 /**
 207  * __port_is_enabled - check if the port's slave is in active state
 208  * @port: the port we're looking at
 209  */
 210 static inline int __port_is_enabled(struct port *port)
 211 {
 212         return bond_is_active_slave(port->slave);
 213 }
 214
 215 /**
 216  * __get_agg_selection_mode - get the aggregator selection mode
 217  * @port: the port we're looking at
 218  *
 219  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 220  */
 221 static inline u32 __get_agg_selection_mode(struct port *port)
 222 {
 223         struct bonding *bond = __get_bond_by_port(port);
 224
 225         if (bond == NULL)
 226                 return BOND_AD_STABLE;
 227
 228         return bond->params.ad_select;
 229 }
 230
 231 /**
 232  * __check_agg_selection_timer - check if the selection timer has expired
 233  * @port: the port we're looking at
 234  */
 235 static inline int __check_agg_selection_timer(struct port *port)
 236 {
 237         struct bonding *bond = __get_bond_by_port(port);
 238
 239         if (bond == NULL)
 240                 return 0;
 241
 242         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 243 }
 244
 245 /**
 246  * __get_link_speed - get a port's speed
 247  * @port: the port we're looking at
 248  *
 249  * Return @port's speed in 802.3ad enum format. i.e. one of:
 250  *     0,
 251  *     %AD_LINK_SPEED_10MBPS,
 252  *     %AD_LINK_SPEED_100MBPS,
 253  *     %AD_LINK_SPEED_1000MBPS,
 254  *     %AD_LINK_SPEED_2500MBPS,
 255  *     %AD_LINK_SPEED_10000MBPS
 256  *     %AD_LINK_SPEED_20000MBPS
 257  *     %AD_LINK_SPEED_40000MBPS
 258  *     %AD_LINK_SPEED_56000MBPS
 259  */
 260 static u16 __get_link_speed(struct port *port)
 261 {
 262         struct slave *slave = port->slave;
 263         u16 speed;
 264
 265         /* this if covers only a special case: when the configuration starts
 266          * with link down, it sets the speed to 0.
 267          * This is done in spite of the fact that the e100 driver reports 0
 268          * to be compatible with MVT in the future.
 269          */
 270         if (slave->link != BOND_LINK_UP)
 271                 speed = 0;
 272         else {
 273                 switch (slave->speed) {
 274                 case SPEED_10:
 275                         speed = AD_LINK_SPEED_10MBPS;
 276                         break;
 277
 278                 case SPEED_100:
 279                         speed = AD_LINK_SPEED_100MBPS;
 280                         break;
 281
 282                 case SPEED_1000:
 283                         speed = AD_LINK_SPEED_1000MBPS;
 284                         break;
 285
 286                 case SPEED_2500:
 287                         speed = AD_LINK_SPEED_2500MBPS;
 288                         break;
 289
 290                 case SPEED_10000:
 291                         speed = AD_LINK_SPEED_10000MBPS;
 292                         break;
 293
 294                 case SPEED_20000:
 295                         speed = AD_LINK_SPEED_20000MBPS;
 296                         break;
 297
 298                 case SPEED_40000:
 299                         speed = AD_LINK_SPEED_40000MBPS;
 300                         break;
 301
 302                 case SPEED_56000:
 303                         speed = AD_LINK_SPEED_56000MBPS;
 304                         break;
 305
 306                 default:
 307                         /* unknown speed value from ethtool. shouldn't happen */
 308                         speed = 0;
 309                         break;
 310                 }
 311         }
 312
 313         netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
 314                    port->actor_port_number, speed);
 315         return speed;
 316 }
 317
 318 /**
 319  * __get_duplex - get a port's duplex
 320  * @port: the port we're looking at
 321  *
 322  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 323  *     0x01 if in full duplex
 324  *     0x00 otherwise
 325  */
 326 static u8 __get_duplex(struct port *port)
 327 {
 328         struct slave *slave = port->slave;
 329         u8 retval;
 330
 331         /* handling a special case: when the configuration starts with
 332          * link down, it sets the duplex to 0.
 333          */
 334         if (slave->link != BOND_LINK_UP) {
 335                 retval = 0x0;
 336         } else {
 337                 switch (slave->duplex) {
 338                 case DUPLEX_FULL:
 339                         retval = 0x1;
 340                         netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
 341                                    port->actor_port_number);
 342                         break;
 343                 case DUPLEX_HALF:
 344                 default:
 345                         retval = 0x0;
 346                         netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
 347                                    port->actor_port_number);
 348                         break;
 349                 }
 350         }
 351         return retval;
 352 }
 353
 354 /* Conversions */
 355
 356 /**
 357  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 358  * @timer_type: which timer to operate
 359  * @par: timer parameter. see below
 360  *
 361  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 362  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 363  *                                                   %SLOW_PERIODIC_TIME.
 364  */
 365 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 366 {
 367         u16 retval = 0; /* to silence the compiler */
 368
 369         switch (timer_type) {
 370         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 371                 if (par)
 372                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 373                 else
 374                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 375                 break;
 376         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 377                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 378                 break;
 379         case AD_PERIODIC_TIMER:         /* for periodic machine */
 380                 retval = (par*ad_ticks_per_sec); /* long timeout */
 381                 break;
 382         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 383                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 384                 break;
 385         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 386                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 387                 break;
 388         }
 389
 390         return retval;
 391 }
 392
 393
 394 /* ================= ad_rx_machine helper functions ================== */
 395
 396 /**
 397  * __choose_matched - update a port's matched variable from a received lacpdu
 398  * @lacpdu: the lacpdu we've received
 399  * @port: the port we're looking at
 400  *
 401  * Update the value of the matched variable, using parameter values from a
 402  * newly received lacpdu. Parameter values for the partner carried in the
 403  * received PDU are compared with the corresponding operational parameter
 404  * values for the actor. Matched is set to TRUE if all of these parameters
 405  * match and the PDU parameter partner_state.aggregation has the same value as
 406  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 407  * in the aggregation. Matched is also set to TRUE if the value of
 408  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 409  * an individual link and lacp will actively maintain the link. Otherwise,
 410  * matched is set to FALSE. LACP is considered to be actively maintaining the
 411  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 412  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 413  * partner_state.lacp_activity variables are TRUE.
 414  *
 415  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 416  * used here to implement the language from 802.3ad 43.4.9 that requires
 417  * recordPDU to "match" the LACPDU parameters to the stored values.
 418  */
 419 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 420 {
 421         /* check if all parameters are alike
 422          * or this is individual link(aggregation == FALSE)
 423          * then update the state machine Matched variable.
 424          */
 425         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 426              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 427              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 428              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 429              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 430              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 431             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 432                 ) {
 433                 port->sm_vars |= AD_PORT_MATCHED;
 434         } else {
 435                 port->sm_vars &= ~AD_PORT_MATCHED;
 436         }
 437 }
 438
 439 /**
 440  * __record_pdu - record parameters from a received lacpdu
 441  * @lacpdu: the lacpdu we've received
 442  * @port: the port we're looking at
 443  *
 444  * Record the parameter values for the Actor carried in a received lacpdu as
 445  * the current partner operational parameter values and sets
 446  * actor_oper_port_state.defaulted to FALSE.
 447  */
 448 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 449 {
 450         if (lacpdu && port) {
 451                 struct port_params *partner = &port->partner_oper;
 452
 453                 __choose_matched(lacpdu, port);
 454                 /* record the new parameter values for the partner
 455                  * operational
 456                  */
 457                 partner->port_number = ntohs(lacpdu->actor_port);
 458                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 459                 partner->system = lacpdu->actor_system;
 460                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 461                 partner->key = ntohs(lacpdu->actor_key);
 462                 partner->port_state = lacpdu->actor_state;
 463
 464                 /* set actor_oper_port_state.defaulted to FALSE */
 465                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 466
 467                 /* set the partner sync. to on if the partner is sync,
 468                  * and the port is matched
 469                  */
 470                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 471                     (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 472                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 473                         pr_debug("%s partner sync=1\n", port->slave->dev->name);
 474                 } else {
 475                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 476                         pr_debug("%s partner sync=0\n", port->slave->dev->name);
 477                 }
 478         }
 479 }
 480
 481 /**
 482  * __record_default - record default parameters
 483  * @port: the port we're looking at
 484  *
 485  * This function records the default parameter values for the partner carried
 486  * in the Partner Admin parameters as the current partner operational parameter
 487  * values and sets actor_oper_port_state.defaulted to TRUE.
 488  */
 489 static void __record_default(struct port *port)
 490 {
 491         if (port) {
 492                 /* record the partner admin parameters */
 493                 memcpy(&port->partner_oper, &port->partner_admin,
 494                        sizeof(struct port_params));
 495
 496                 /* set actor_oper_port_state.defaulted to true */
 497                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 498         }
 499 }
 500
 501 /**
 502  * __update_selected - update a port's Selected variable from a received lacpdu
 503  * @lacpdu: the lacpdu we've received
 504  * @port: the port we're looking at
 505  *
 506  * Update the value of the selected variable, using parameter values from a
 507  * newly received lacpdu. The parameter values for the Actor carried in the
 508  * received PDU are compared with the corresponding operational parameter
 509  * values for the ports partner. If one or more of the comparisons shows that
 510  * the value(s) received in the PDU differ from the current operational values,
 511  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 512  * set to out_of_sync. Otherwise, selected remains unchanged.
 513  */
 514 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 515 {
 516         if (lacpdu && port) {
 517                 const struct port_params *partner = &port->partner_oper;
 518
 519                 /* check if any parameter is different then
 520                  * update the state machine selected variable.
 521                  */
 522                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 523                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 524                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 525                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 526                     ntohs(lacpdu->actor_key) != partner->key ||
 527                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 528                         port->sm_vars &= ~AD_PORT_SELECTED;
 529                 }
 530         }
 531 }
 532
 533 /**
 534  * __update_default_selected - update a port's Selected variable from Partner
 535  * @port: the port we're looking at
 536  *
 537  * This function updates the value of the selected variable, using the partner
 538  * administrative parameter values. The administrative values are compared with
 539  * the corresponding operational parameter values for the partner. If one or
 540  * more of the comparisons shows that the administrative value(s) differ from
 541  * the current operational values, then Selected is set to FALSE and
 542  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 543  * Selected remains unchanged.
 544  */
 545 static void __update_default_selected(struct port *port)
 546 {
 547         if (port) {
 548                 const struct port_params *admin = &port->partner_admin;
 549                 const struct port_params *oper = &port->partner_oper;
 550
 551                 /* check if any parameter is different then
 552                  * update the state machine selected variable.
 553                  */
 554                 if (admin->port_number != oper->port_number ||
 555                     admin->port_priority != oper->port_priority ||
 556                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 557                     admin->system_priority != oper->system_priority ||
 558                     admin->key != oper->key ||
 559                     (admin->port_state & AD_STATE_AGGREGATION)
 560                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 561                         port->sm_vars &= ~AD_PORT_SELECTED;
 562                 }
 563         }
 564 }
 565
 566 /**
 567  * __update_ntt - update a port's ntt variable from a received lacpdu
 568  * @lacpdu: the lacpdu we've received
 569  * @port: the port we're looking at
 570  *
 571  * Updates the value of the ntt variable, using parameter values from a newly
 572  * received lacpdu. The parameter values for the partner carried in the
 573  * received PDU are compared with the corresponding operational parameter
 574  * values for the Actor. If one or more of the comparisons shows that the
 575  * value(s) received in the PDU differ from the current operational values,
 576  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 577  */
 578 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 579 {
 580         /* validate lacpdu and port */
 581         if (lacpdu && port) {
 582                 /* check if any parameter is different then
 583                  * update the port->ntt.
 584                  */
 585                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 586                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 587                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 588                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 589                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 590                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 591                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 592                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 593                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 594                    ) {
 595                         port->ntt = true;
 596                 }
 597         }
 598 }
 599
 600 /**
 601  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 602  * @aggregator: the aggregator we're looking at
 603  *
 604  */
 605 static int __agg_ports_are_ready(struct aggregator *aggregator)
 606 {
 607         struct port *port;
 608         int retval = 1;
 609
 610         if (aggregator) {
 611                 /* scan all ports in this aggregator to verfy if they are
 612                  * all ready.
 613                  */
 614                 for (port = aggregator->lag_ports;
 615                      port;
 616                      port = port->next_port_in_aggregator) {
 617                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 618                                 retval = 0;
 619                                 break;
 620                         }
 621                 }
 622         }
 623
 624         return retval;
 625 }
 626
 627 /**
 628  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 629  * @aggregator: the aggregator we're looking at
 630  * @val: Should the ports' ready bit be set on or off
 631  *
 632  */
 633 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 634 {
 635         struct port *port;
 636
 637         for (port = aggregator->lag_ports; port;
 638              port = port->next_port_in_aggregator) {
 639                 if (val)
 640                         port->sm_vars |= AD_PORT_READY;
 641                 else
 642                         port->sm_vars &= ~AD_PORT_READY;
 643         }
 644 }
 645
 646 /**
 647  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 648  * @aggregator: the aggregator we're looking at
 649  *
 650  */
 651 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 652 {
 653         u32 bandwidth = 0;
 654
 655         if (aggregator->num_of_ports) {
 656                 switch (__get_link_speed(aggregator->lag_ports)) {
 657                 case AD_LINK_SPEED_1MBPS:
 658                         bandwidth = aggregator->num_of_ports;
 659                         break;
 660                 case AD_LINK_SPEED_10MBPS:
 661                         bandwidth = aggregator->num_of_ports * 10;
 662                         break;
 663                 case AD_LINK_SPEED_100MBPS:
 664                         bandwidth = aggregator->num_of_ports * 100;
 665                         break;
 666                 case AD_LINK_SPEED_1000MBPS:
 667                         bandwidth = aggregator->num_of_ports * 1000;
 668                         break;
 669                 case AD_LINK_SPEED_2500MBPS:
 670                         bandwidth = aggregator->num_of_ports * 2500;
 671                         break;
 672                 case AD_LINK_SPEED_10000MBPS:
 673                         bandwidth = aggregator->num_of_ports * 10000;
 674                         break;
 675                 case AD_LINK_SPEED_20000MBPS:
 676                         bandwidth = aggregator->num_of_ports * 20000;
 677                         break;
 678                 case AD_LINK_SPEED_40000MBPS:
 679                         bandwidth = aggregator->num_of_ports * 40000;
 680                         break;
 681                 case AD_LINK_SPEED_56000MBPS:
 682                         bandwidth = aggregator->num_of_ports * 56000;
 683                         break;
 684                 default:
 685                         bandwidth = 0; /* to silence the compiler */
 686                 }
 687         }
 688         return bandwidth;
 689 }
 690
 691 /**
 692  * __get_active_agg - get the current active aggregator
 693  * @aggregator: the aggregator we're looking at
 694  *
 695  * Caller must hold RCU lock.
 696  */
 697 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 698 {
 699         struct bonding *bond = aggregator->slave->bond;
 700         struct list_head *iter;
 701         struct slave *slave;
 702
 703         bond_for_each_slave_rcu(bond, slave, iter)
 704                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 705                         return &(SLAVE_AD_INFO(slave)->aggregator);
 706
 707         return NULL;
 708 }
 709
 710 /**
 711  * __update_lacpdu_from_port - update a port's lacpdu fields
 712  * @port: the port we're looking at
 713  */
 714 static inline void __update_lacpdu_from_port(struct port *port)
 715 {
 716         struct lacpdu *lacpdu = &port->lacpdu;
 717         const struct port_params *partner = &port->partner_oper;
 718
 719         /* update current actual Actor parameters
 720          * lacpdu->subtype                   initialized
 721          * lacpdu->version_number            initialized
 722          * lacpdu->tlv_type_actor_info       initialized
 723          * lacpdu->actor_information_length  initialized
 724          */
 725
 726         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 727         lacpdu->actor_system = port->actor_system;
 728         lacpdu->actor_key = htons(port->actor_oper_port_key);
 729         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 730         lacpdu->actor_port = htons(port->actor_port_number);
 731         lacpdu->actor_state = port->actor_oper_port_state;
 732         pr_debug("update lacpdu: %s, actor port state %x\n",
 733                  port->slave->dev->name, port->actor_oper_port_state);
 734
 735         /* lacpdu->reserved_3_1              initialized
 736          * lacpdu->tlv_type_partner_info     initialized
 737          * lacpdu->partner_information_length initialized
 738          */
 739
 740         lacpdu->partner_system_priority = htons(partner->system_priority);
 741         lacpdu->partner_system = partner->system;
 742         lacpdu->partner_key = htons(partner->key);
 743         lacpdu->partner_port_priority = htons(partner->port_priority);
 744         lacpdu->partner_port = htons(partner->port_number);
 745         lacpdu->partner_state = partner->port_state;
 746
 747         /* lacpdu->reserved_3_2              initialized
 748          * lacpdu->tlv_type_collector_info   initialized
 749          * lacpdu->collector_information_length initialized
 750          * collector_max_delay                initialized
 751          * reserved_12[12]                   initialized
 752          * tlv_type_terminator               initialized
 753          * terminator_length                 initialized
 754          * reserved_50[50]                   initialized
 755          */
 756 }
 757
 758 /* ================= main 802.3ad protocol code ========================= */
 759
 760 /**
 761  * ad_lacpdu_send - send out a lacpdu packet on a given port
 762  * @port: the port we're looking at
 763  *
 764  * Returns:   0 on success
 765  *          < 0 on error
 766  */
 767 static int ad_lacpdu_send(struct port *port)
 768 {
 769         struct slave *slave = port->slave;
 770         struct sk_buff *skb;
 771         struct lacpdu_header *lacpdu_header;
 772         int length = sizeof(struct lacpdu_header);
 773
 774         skb = dev_alloc_skb(length);
 775         if (!skb)
 776                 return -ENOMEM;
 777
 778         skb->dev = slave->dev;
 779         skb_reset_mac_header(skb);
 780         skb->network_header = skb->mac_header + ETH_HLEN;
 781         skb->protocol = PKT_TYPE_LACPDU;
 782         skb->priority = TC_PRIO_CONTROL;
 783
 784         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 785
 786         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 787         /* Note: source address is set to be the member's PERMANENT address,
 788          * because we use it to identify loopback lacpdus in receive.
 789          */
 790         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 791         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 792
 793         lacpdu_header->lacpdu = port->lacpdu;
 794
 795         dev_queue_xmit(skb);
 796
 797         return 0;
 798 }
 799
 800 /**
 801  * ad_marker_send - send marker information/response on a given port
 802  * @port: the port we're looking at
 803  * @marker: marker data to send
 804  *
 805  * Returns:   0 on success
 806  *          < 0 on error
 807  */
 808 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 809 {
 810         struct slave *slave = port->slave;
 811         struct sk_buff *skb;
 812         struct bond_marker_header *marker_header;
 813         int length = sizeof(struct bond_marker_header);
 814
 815         skb = dev_alloc_skb(length + 16);
 816         if (!skb)
 817                 return -ENOMEM;
 818
 819         skb_reserve(skb, 16);
 820
 821         skb->dev = slave->dev;
 822         skb_reset_mac_header(skb);
 823         skb->network_header = skb->mac_header + ETH_HLEN;
 824         skb->protocol = PKT_TYPE_LACPDU;
 825
 826         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 827
 828         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 829         /* Note: source address is set to be the member's PERMANENT address,
 830          * because we use it to identify loopback MARKERs in receive.
 831          */
 832         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 833         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 834
 835         marker_header->marker = *marker;
 836
 837         dev_queue_xmit(skb);
 838
 839         return 0;
 840 }
 841
 842 /**
 843  * ad_mux_machine - handle a port's mux state machine
 844  * @port: the port we're looking at
 845  * @update_slave_arr: Does slave array need update?
 846  */
 847 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 848 {
 849         mux_states_t last_state;
 850
 851         /* keep current State Machine state to compare later if it was
 852          * changed
 853          */
 854         last_state = port->sm_mux_state;
 855
 856         if (port->sm_vars & AD_PORT_BEGIN) {
 857                 port->sm_mux_state = AD_MUX_DETACHED;
 858         } else {
 859                 switch (port->sm_mux_state) {
 860                 case AD_MUX_DETACHED:
 861                         if ((port->sm_vars & AD_PORT_SELECTED)
 862                             || (port->sm_vars & AD_PORT_STANDBY))
 863                                 /* if SELECTED or STANDBY */
 864                                 port->sm_mux_state = AD_MUX_WAITING;
 865                         break;
 866                 case AD_MUX_WAITING:
 867                         /* if SELECTED == FALSE return to DETACH state */
 868                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 869                                 port->sm_vars &= ~AD_PORT_READY_N;
 870                                 /* in order to withhold the Selection Logic to
 871                                  * check all ports READY_N value every callback
 872                                  * cycle to update ready variable, we check
 873                                  * READY_N and update READY here
 874                                  */
 875                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 876                                 port->sm_mux_state = AD_MUX_DETACHED;
 877                                 break;
 878                         }
 879
 880                         /* check if the wait_while_timer expired */
 881                         if (port->sm_mux_timer_counter
 882                             && !(--port->sm_mux_timer_counter))
 883                                 port->sm_vars |= AD_PORT_READY_N;
 884
 885                         /* in order to withhold the selection logic to check
 886                          * all ports READY_N value every callback cycle to
 887                          * update ready variable, we check READY_N and update
 888                          * READY here
 889                          */
 890                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 891
 892                         /* if the wait_while_timer expired, and the port is
 893                          * in READY state, move to ATTACHED state
 894                          */
 895                         if ((port->sm_vars & AD_PORT_READY)
 896                             && !port->sm_mux_timer_counter)
 897                                 port->sm_mux_state = AD_MUX_ATTACHED;
 898                         break;
 899                 case AD_MUX_ATTACHED:
 900                         /* check also if agg_select_timer expired (so the
 901                          * edable port will take place only after this timer)
 902                          */
 903                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 904                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 905                             !__check_agg_selection_timer(port)) {
 906                                 if (port->aggregator->is_active)
 907                                         port->sm_mux_state =
 908                                             AD_MUX_COLLECTING_DISTRIBUTING;
 909                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 910                                    (port->sm_vars & AD_PORT_STANDBY)) {
 911                                 /* if UNSELECTED or STANDBY */
 912                                 port->sm_vars &= ~AD_PORT_READY_N;
 913                                 /* in order to withhold the selection logic to
 914                                  * check all ports READY_N value every callback
 915                                  * cycle to update ready variable, we check
 916                                  * READY_N and update READY here
 917                                  */
 918                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 919                                 port->sm_mux_state = AD_MUX_DETACHED;
 920                         } else if (port->aggregator->is_active) {
 921                                 port->actor_oper_port_state |=
 922                                     AD_STATE_SYNCHRONIZATION;
 923                         }
 924                         break;
 925                 case AD_MUX_COLLECTING_DISTRIBUTING:
 926                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
 927                             (port->sm_vars & AD_PORT_STANDBY) ||
 928                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
 929                             !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
 930                                 port->sm_mux_state = AD_MUX_ATTACHED;
 931                         } else {
 932                                 /* if port state hasn't changed make
 933                                  * sure that a collecting distributing
 934                                  * port in an active aggregator is enabled
 935                                  */
 936                                 if (port->aggregator &&
 937                                     port->aggregator->is_active &&
 938                                     !__port_is_enabled(port)) {
 939
 940                                         __enable_port(port);
 941                                 }
 942                         }
 943                         break;
 944                 default:
 945                         break;
 946                 }
 947         }
 948
 949         /* check if the state machine was changed */
 950         if (port->sm_mux_state != last_state) {
 951                 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
 952                          port->actor_port_number,
 953                          port->slave->dev->name,
 954                          last_state,
 955                          port->sm_mux_state);
 956                 switch (port->sm_mux_state) {
 957                 case AD_MUX_DETACHED:
 958                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 959                         ad_disable_collecting_distributing(port,
 960                                                            update_slave_arr);
 961                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 962                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 963                         port->ntt = true;
 964                         break;
 965                 case AD_MUX_WAITING:
 966                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 967                         break;
 968                 case AD_MUX_ATTACHED:
 969                         if (port->aggregator->is_active)
 970                                 port->actor_oper_port_state |=
 971                                     AD_STATE_SYNCHRONIZATION;
 972                         else
 973                                 port->actor_oper_port_state &=
 974                                     ~AD_STATE_SYNCHRONIZATION;
 975                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 976                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 977                         ad_disable_collecting_distributing(port,
 978                                                            update_slave_arr);
 979                         port->ntt = true;
 980                         break;
 981                 case AD_MUX_COLLECTING_DISTRIBUTING:
 982                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 983                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 984                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 985                         ad_enable_collecting_distributing(port,
 986                                                           update_slave_arr);
 987                         port->ntt = true;
 988                         break;
 989                 default:
 990                         break;
 991                 }
 992         }
 993 }
 994
 995 /**
 996  * ad_rx_machine - handle a port's rx State Machine
 997  * @lacpdu: the lacpdu we've received
 998  * @port: the port we're looking at
 999  *
1000  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1001  * CURRENT. If timer expired set the state machine in the proper state.
1002  * In other cases, this function checks if we need to switch to other state.
1003  */
1004 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1005 {
1006         rx_states_t last_state;
1007
1008         /* keep current State Machine state to compare later if it was
1009          * changed
1010          */
1011         last_state = port->sm_rx_state;
1012
1013         /* check if state machine should change state */
1014
1015         /* first, check if port was reinitialized */
1016         if (port->sm_vars & AD_PORT_BEGIN)
1017                 port->sm_rx_state = AD_RX_INITIALIZE;
1018         /* check if port is not enabled */
1019         else if (!(port->sm_vars & AD_PORT_BEGIN)
1020                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
1021                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1022         /* check if new lacpdu arrived */
1023         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1024                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1025                  (port->sm_rx_state == AD_RX_CURRENT))) {
1026                 port->sm_rx_timer_counter = 0;
1027                 port->sm_rx_state = AD_RX_CURRENT;
1028         } else {
1029                 /* if timer is on, and if it is expired */
1030                 if (port->sm_rx_timer_counter &&
1031                     !(--port->sm_rx_timer_counter)) {
1032                         switch (port->sm_rx_state) {
1033                         case AD_RX_EXPIRED:
1034                                 port->sm_rx_state = AD_RX_DEFAULTED;
1035                                 break;
1036                         case AD_RX_CURRENT:
1037                                 port->sm_rx_state = AD_RX_EXPIRED;
1038                                 break;
1039                         default:
1040                                 break;
1041                         }
1042                 } else {
1043                         /* if no lacpdu arrived and no timer is on */
1044                         switch (port->sm_rx_state) {
1045                         case AD_RX_PORT_DISABLED:
1046                                 if (port->sm_vars & AD_PORT_MOVED)
1047                                         port->sm_rx_state = AD_RX_INITIALIZE;
1048                                 else if (port->is_enabled
1049                                          && (port->sm_vars
1050                                              & AD_PORT_LACP_ENABLED))
1051                                         port->sm_rx_state = AD_RX_EXPIRED;
1052                                 else if (port->is_enabled
1053                                          && ((port->sm_vars
1054                                               & AD_PORT_LACP_ENABLED) == 0))
1055                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1056                                 break;
1057                         default:
1058                                 break;
1059
1060                         }
1061                 }
1062         }
1063
1064         /* check if the State machine was changed or new lacpdu arrived */
1065         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1066                 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1067                          port->actor_port_number,
1068                          port->slave->dev->name,
1069                          last_state,
1070                          port->sm_rx_state);
1071                 switch (port->sm_rx_state) {
1072                 case AD_RX_INITIALIZE:
1073                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1074                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1075                         else
1076                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1077                         port->sm_vars &= ~AD_PORT_SELECTED;
1078                         __record_default(port);
1079                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1080                         port->sm_vars &= ~AD_PORT_MOVED;
1081                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1082
1083                         /* Fall Through */
1084                 case AD_RX_PORT_DISABLED:
1085                         port->sm_vars &= ~AD_PORT_MATCHED;
1086                         break;
1087                 case AD_RX_LACP_DISABLED:
1088                         port->sm_vars &= ~AD_PORT_SELECTED;
1089                         __record_default(port);
1090                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1091                         port->sm_vars |= AD_PORT_MATCHED;
1092                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1093                         break;
1094                 case AD_RX_EXPIRED:
1095                         /* Reset of the Synchronization flag (Standard 43.4.12)
1096                          * This reset cause to disable this port in the
1097                          * COLLECTING_DISTRIBUTING state of the mux machine in
1098                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1099                          * the port.
1100                          */
1101                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1102                         port->sm_vars &= ~AD_PORT_MATCHED;
1103                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1104                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1105                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1106                         break;
1107                 case AD_RX_DEFAULTED:
1108                         __update_default_selected(port);
1109                         __record_default(port);
1110                         port->sm_vars |= AD_PORT_MATCHED;
1111                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1112                         break;
1113                 case AD_RX_CURRENT:
1114                         /* detect loopback situation */
1115                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1116                                               &(port->actor_system))) {
1117                                 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1118                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1119                                        port->slave->dev->name);
1120                                 return;
1121                         }
1122                         __update_selected(lacpdu, port);
1123                         __update_ntt(lacpdu, port);
1124                         __record_pdu(lacpdu, port);
1125                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1126                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1127                         break;
1128                 default:
1129                         break;
1130                 }
1131         }
1132 }
1133
1134 /**
1135  * ad_tx_machine - handle a port's tx state machine
1136  * @port: the port we're looking at
1137  */
1138 static void ad_tx_machine(struct port *port)
1139 {
1140         /* check if tx timer expired, to verify that we do not send more than
1141          * 3 packets per second
1142          */
1143         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1144                 /* check if there is something to send */
1145                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1146                         __update_lacpdu_from_port(port);
1147
1148                         if (ad_lacpdu_send(port) >= 0) {
1149                                 pr_debug("Sent LACPDU on port %d\n",
1150                                          port->actor_port_number);
1151
1152                                 /* mark ntt as false, so it will not be sent
1153                                  * again until demanded
1154                                  */
1155                                 port->ntt = false;
1156                         }
1157                 }
1158                 /* restart tx timer(to verify that we will not exceed
1159                  * AD_MAX_TX_IN_SECOND
1160                  */
1161                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1162         }
1163 }
1164
1165 /**
1166  * ad_periodic_machine - handle a port's periodic state machine
1167  * @port: the port we're looking at
1168  *
1169  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1170  */
1171 static void ad_periodic_machine(struct port *port)
1172 {
1173         periodic_states_t last_state;
1174
1175         /* keep current state machine state to compare later if it was changed */
1176         last_state = port->sm_periodic_state;
1177
1178         /* check if port was reinitialized */
1179         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1180             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1181            ) {
1182                 port->sm_periodic_state = AD_NO_PERIODIC;
1183         }
1184         /* check if state machine should change state */
1185         else if (port->sm_periodic_timer_counter) {
1186                 /* check if periodic state machine expired */
1187                 if (!(--port->sm_periodic_timer_counter)) {
1188                         /* if expired then do tx */
1189                         port->sm_periodic_state = AD_PERIODIC_TX;
1190                 } else {
1191                         /* If not expired, check if there is some new timeout
1192                          * parameter from the partner state
1193                          */
1194                         switch (port->sm_periodic_state) {
1195                         case AD_FAST_PERIODIC:
1196                                 if (!(port->partner_oper.port_state
1197                                       & AD_STATE_LACP_TIMEOUT))
1198                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1199                                 break;
1200                         case AD_SLOW_PERIODIC:
1201                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1202                                         port->sm_periodic_timer_counter = 0;
1203                                         port->sm_periodic_state = AD_PERIODIC_TX;
1204                                 }
1205                                 break;
1206                         default:
1207                                 break;
1208                         }
1209                 }
1210         } else {
1211                 switch (port->sm_periodic_state) {
1212                 case AD_NO_PERIODIC:
1213                         port->sm_periodic_state = AD_FAST_PERIODIC;
1214                         break;
1215                 case AD_PERIODIC_TX:
1216                         if (!(port->partner_oper.port_state &
1217                             AD_STATE_LACP_TIMEOUT))
1218                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1219                         else
1220                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1221                         break;
1222                 default:
1223                         break;
1224                 }
1225         }
1226
1227         /* check if the state machine was changed */
1228         if (port->sm_periodic_state != last_state) {
1229                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1230                          port->actor_port_number, last_state,
1231                          port->sm_periodic_state);
1232                 switch (port->sm_periodic_state) {
1233                 case AD_NO_PERIODIC:
1234                         port->sm_periodic_timer_counter = 0;
1235                         break;
1236                 case AD_FAST_PERIODIC:
1237                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1238                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1239                         break;
1240                 case AD_SLOW_PERIODIC:
1241                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1242                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1243                         break;
1244                 case AD_PERIODIC_TX:
1245                         port->ntt = true;
1246                         break;
1247                 default:
1248                         break;
1249                 }
1250         }
1251 }
1252
1253 /**
1254  * ad_port_selection_logic - select aggregation groups
1255  * @port: the port we're looking at
1256  * @update_slave_arr: Does slave array need update?
1257  *
1258  * Select aggregation groups, and assign each port for it's aggregetor. The
1259  * selection logic is called in the inititalization (after all the handshkes),
1260  * and after every lacpdu receive (if selected is off).
1261  */
1262 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1263 {
1264         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1265         struct port *last_port = NULL, *curr_port;
1266         struct list_head *iter;
1267         struct bonding *bond;
1268         struct slave *slave;
1269         int found = 0;
1270
1271         /* if the port is already Selected, do nothing */
1272         if (port->sm_vars & AD_PORT_SELECTED)
1273                 return;
1274
1275         bond = __get_bond_by_port(port);
1276
1277         /* if the port is connected to other aggregator, detach it */
1278         if (port->aggregator) {
1279                 /* detach the port from its former aggregator */
1280                 temp_aggregator = port->aggregator;
1281                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1282                      last_port = curr_port,
1283                      curr_port = curr_port->next_port_in_aggregator) {
1284                         if (curr_port == port) {
1285                                 temp_aggregator->num_of_ports--;
1286                                 /* if it is the first port attached to the
1287                                  * aggregator
1288                                  */
1289                                 if (!last_port) {
1290                                         temp_aggregator->lag_ports =
1291                                                 port->next_port_in_aggregator;
1292                                 } else {
1293                                         /* not the first port attached to the
1294                                          * aggregator
1295                                          */
1296                                         last_port->next_port_in_aggregator =
1297                                                 port->next_port_in_aggregator;
1298                                 }
1299
1300                                 /* clear the port's relations to this
1301                                  * aggregator
1302                                  */
1303                                 port->aggregator = NULL;
1304                                 port->next_port_in_aggregator = NULL;
1305                                 port->actor_port_aggregator_identifier = 0;
1306
1307                                 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1308                                            port->actor_port_number,
1309                                            temp_aggregator->aggregator_identifier);
1310                                 /* if the aggregator is empty, clear its
1311                                  * parameters, and set it ready to be attached
1312                                  */
1313                                 if (!temp_aggregator->lag_ports)
1314                                         ad_clear_agg(temp_aggregator);
1315                                 break;
1316                         }
1317                 }
1318                 if (!curr_port) {
1319                         /* meaning: the port was related to an aggregator
1320                          * but was not on the aggregator port list
1321                          */
1322                         net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1323                                              port->slave->bond->dev->name,
1324                                              port->actor_port_number,
1325                                              port->slave->dev->name,
1326                                              port->aggregator->aggregator_identifier);
1327                 }
1328         }
1329         /* search on all aggregators for a suitable aggregator for this port */
1330         bond_for_each_slave(bond, slave, iter) {
1331                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1332
1333                 /* keep a free aggregator for later use(if needed) */
1334                 if (!aggregator->lag_ports) {
1335                         if (!free_aggregator)
1336                                 free_aggregator = aggregator;
1337                         continue;
1338                 }
1339                 /* check if current aggregator suits us */
1340                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1341                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1342                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1343                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1344                     ) &&
1345                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1346                       !aggregator->is_individual)  /* but is not individual OR */
1347                     )
1348                    ) {
1349                         /* attach to the founded aggregator */
1350                         port->aggregator = aggregator;
1351                         port->actor_port_aggregator_identifier =
1352                                 port->aggregator->aggregator_identifier;
1353                         port->next_port_in_aggregator = aggregator->lag_ports;
1354                         port->aggregator->num_of_ports++;
1355                         aggregator->lag_ports = port;
1356                         netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1357                                    port->actor_port_number,
1358                                    port->aggregator->aggregator_identifier);
1359
1360                         /* mark this port as selected */
1361                         port->sm_vars |= AD_PORT_SELECTED;
1362                         found = 1;
1363                         break;
1364                 }
1365         }
1366
1367         /* the port couldn't find an aggregator - attach it to a new
1368          * aggregator
1369          */
1370         if (!found) {
1371                 if (free_aggregator) {
1372                         /* assign port a new aggregator */
1373                         port->aggregator = free_aggregator;
1374                         port->actor_port_aggregator_identifier =
1375                                 port->aggregator->aggregator_identifier;
1376
1377                         /* update the new aggregator's parameters
1378                          * if port was responsed from the end-user
1379                          */
1380                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1381                                 /* if port is full duplex */
1382                                 port->aggregator->is_individual = false;
1383                         else
1384                                 port->aggregator->is_individual = true;
1385
1386                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1387                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1388                         port->aggregator->partner_system =
1389                                 port->partner_oper.system;
1390                         port->aggregator->partner_system_priority =
1391                                 port->partner_oper.system_priority;
1392                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1393                         port->aggregator->receive_state = 1;
1394                         port->aggregator->transmit_state = 1;
1395                         port->aggregator->lag_ports = port;
1396                         port->aggregator->num_of_ports++;
1397
1398                         /* mark this port as selected */
1399                         port->sm_vars |= AD_PORT_SELECTED;
1400
1401                         netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1402                                    port->actor_port_number,
1403                                    port->aggregator->aggregator_identifier);
1404                 } else {
1405                         netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1406                                port->actor_port_number, port->slave->dev->name);
1407                 }
1408         }
1409         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1410          * in all aggregator's ports, else set ready=FALSE in all
1411          * aggregator's ports
1412          */
1413         __set_agg_ports_ready(port->aggregator,
1414                               __agg_ports_are_ready(port->aggregator));
1415
1416         aggregator = __get_first_agg(port);
1417         ad_agg_selection_logic(aggregator, update_slave_arr);
1418
1419         if (!port->aggregator->is_active)
1420                 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1421 }
1422
1423 /* Decide if "agg" is a better choice for the new active aggregator that
1424  * the current best, according to the ad_select policy.
1425  */
1426 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1427                                                 struct aggregator *curr)
1428 {
1429         /* 0. If no best, select current.
1430          *
1431          * 1. If the current agg is not individual, and the best is
1432          *    individual, select current.
1433          *
1434          * 2. If current agg is individual and the best is not, keep best.
1435          *
1436          * 3. Therefore, current and best are both individual or both not
1437          *    individual, so:
1438          *
1439          * 3a. If current agg partner replied, and best agg partner did not,
1440          *     select current.
1441          *
1442          * 3b. If current agg partner did not reply and best agg partner
1443          *     did reply, keep best.
1444          *
1445          * 4.  Therefore, current and best both have partner replies or
1446          *     both do not, so perform selection policy:
1447          *
1448          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1449          *     select by bandwidth.
1450          *
1451          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1452          */
1453         if (!best)
1454                 return curr;
1455
1456         if (!curr->is_individual && best->is_individual)
1457                 return curr;
1458
1459         if (curr->is_individual && !best->is_individual)
1460                 return best;
1461
1462         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1463                 return curr;
1464
1465         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1466                 return best;
1467
1468         switch (__get_agg_selection_mode(curr->lag_ports)) {
1469         case BOND_AD_COUNT:
1470                 if (curr->num_of_ports > best->num_of_ports)
1471                         return curr;
1472
1473                 if (curr->num_of_ports < best->num_of_ports)
1474                         return best;
1475
1476                 /*FALLTHROUGH*/
1477         case BOND_AD_STABLE:
1478         case BOND_AD_BANDWIDTH:
1479                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1480                         return curr;
1481
1482                 break;
1483
1484         default:
1485                 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1486                                      curr->slave->bond->dev->name,
1487                                      __get_agg_selection_mode(curr->lag_ports));
1488                 break;
1489         }
1490
1491         return best;
1492 }
1493
1494 static int agg_device_up(const struct aggregator *agg)
1495 {
1496         struct port *port = agg->lag_ports;
1497
1498         if (!port)
1499                 return 0;
1500
1501         return netif_running(port->slave->dev) &&
1502                netif_carrier_ok(port->slave->dev);
1503 }
1504
1505 /**
1506  * ad_agg_selection_logic - select an aggregation group for a team
1507  * @aggregator: the aggregator we're looking at
1508  * @update_slave_arr: Does slave array need update?
1509  *
1510  * It is assumed that only one aggregator may be selected for a team.
1511  *
1512  * The logic of this function is to select the aggregator according to
1513  * the ad_select policy:
1514  *
1515  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1516  * it, and to reselect the active aggregator only if the previous
1517  * aggregator has no more ports related to it.
1518  *
1519  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1520  * bandwidth, and reselect whenever a link state change takes place or the
1521  * set of slaves in the bond changes.
1522  *
1523  * BOND_AD_COUNT: select the aggregator with largest number of ports
1524  * (slaves), and reselect whenever a link state change takes place or the
1525  * set of slaves in the bond changes.
1526  *
1527  * FIXME: this function MUST be called with the first agg in the bond, or
1528  * __get_active_agg() won't work correctly. This function should be better
1529  * called with the bond itself, and retrieve the first agg from it.
1530  */
1531 static void ad_agg_selection_logic(struct aggregator *agg,
1532                                    bool *update_slave_arr)
1533 {
1534         struct aggregator *best, *active, *origin;
1535         struct bonding *bond = agg->slave->bond;
1536         struct list_head *iter;
1537         struct slave *slave;
1538         struct port *port;
1539
1540         rcu_read_lock();
1541         origin = agg;
1542         active = __get_active_agg(agg);
1543         best = (active && agg_device_up(active)) ? active : NULL;
1544
1545         bond_for_each_slave_rcu(bond, slave, iter) {
1546                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1547
1548                 agg->is_active = 0;
1549
1550                 if (agg->num_of_ports && agg_device_up(agg))
1551                         best = ad_agg_selection_test(best, agg);
1552         }
1553
1554         if (best &&
1555             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1556                 /* For the STABLE policy, don't replace the old active
1557                  * aggregator if it's still active (it has an answering
1558                  * partner) or if both the best and active don't have an
1559                  * answering partner.
1560                  */
1561                 if (active && active->lag_ports &&
1562                     active->lag_ports->is_enabled &&
1563                     (__agg_has_partner(active) ||
1564                      (!__agg_has_partner(active) &&
1565                      !__agg_has_partner(best)))) {
1566                         if (!(!active->actor_oper_aggregator_key &&
1567                               best->actor_oper_aggregator_key)) {
1568                                 best = NULL;
1569                                 active->is_active = 1;
1570                         }
1571                 }
1572         }
1573
1574         if (best && (best == active)) {
1575                 best = NULL;
1576                 active->is_active = 1;
1577         }
1578
1579         /* if there is new best aggregator, activate it */
1580         if (best) {
1581                 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1582                            best->aggregator_identifier, best->num_of_ports,
1583                            best->actor_oper_aggregator_key,
1584                            best->partner_oper_aggregator_key,
1585                            best->is_individual, best->is_active);
1586                 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1587                            best->lag_ports, best->slave,
1588                            best->slave ? best->slave->dev->name : "NULL");
1589
1590                 bond_for_each_slave_rcu(bond, slave, iter) {
1591                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1592
1593                         netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1594                                    agg->aggregator_identifier, agg->num_of_ports,
1595                                    agg->actor_oper_aggregator_key,
1596                                    agg->partner_oper_aggregator_key,
1597                                    agg->is_individual, agg->is_active);
1598                 }
1599
1600                 /* check if any partner replys */
1601                 if (best->is_individual) {
1602                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1603                                              best->slave ?
1604                                              best->slave->bond->dev->name : "NULL");
1605                 }
1606
1607                 best->is_active = 1;
1608                 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1609                            best->aggregator_identifier);
1610                 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1611                            best->aggregator_identifier, best->num_of_ports,
1612                            best->actor_oper_aggregator_key,
1613                            best->partner_oper_aggregator_key,
1614                            best->is_individual, best->is_active);
1615
1616                 /* disable the ports that were related to the former
1617                  * active_aggregator
1618                  */
1619                 if (active) {
1620                         for (port = active->lag_ports; port;
1621                              port = port->next_port_in_aggregator) {
1622                                 __disable_port(port);
1623                         }
1624                 }
1625                 /* Slave array needs update. */
1626                 *update_slave_arr = true;
1627         }
1628
1629         /* if the selected aggregator is of join individuals
1630          * (partner_system is NULL), enable their ports
1631          */
1632         active = __get_active_agg(origin);
1633
1634         if (active) {
1635                 if (!__agg_has_partner(active)) {
1636                         for (port = active->lag_ports; port;
1637                              port = port->next_port_in_aggregator) {
1638                                 __enable_port(port);
1639                         }
1640                 }
1641         }
1642
1643         rcu_read_unlock();
1644
1645         bond_3ad_set_carrier(bond);
1646 }
1647
1648 /**
1649  * ad_clear_agg - clear a given aggregator's parameters
1650  * @aggregator: the aggregator we're looking at
1651  */
1652 static void ad_clear_agg(struct aggregator *aggregator)
1653 {
1654         if (aggregator) {
1655                 aggregator->is_individual = false;
1656                 aggregator->actor_admin_aggregator_key = 0;
1657                 aggregator->actor_oper_aggregator_key = 0;
1658                 aggregator->partner_system = null_mac_addr;
1659                 aggregator->partner_system_priority = 0;
1660                 aggregator->partner_oper_aggregator_key = 0;
1661                 aggregator->receive_state = 0;
1662                 aggregator->transmit_state = 0;
1663                 aggregator->lag_ports = NULL;
1664                 aggregator->is_active = 0;
1665                 aggregator->num_of_ports = 0;
1666                 pr_debug("LAG %d was cleared\n",
1667                          aggregator->aggregator_identifier);
1668         }
1669 }
1670
1671 /**
1672  * ad_initialize_agg - initialize a given aggregator's parameters
1673  * @aggregator: the aggregator we're looking at
1674  */
1675 static void ad_initialize_agg(struct aggregator *aggregator)
1676 {
1677         if (aggregator) {
1678                 ad_clear_agg(aggregator);
1679
1680                 aggregator->aggregator_mac_address = null_mac_addr;
1681                 aggregator->aggregator_identifier = 0;
1682                 aggregator->slave = NULL;
1683         }
1684 }
1685
1686 /**
1687  * ad_initialize_port - initialize a given port's parameters
1688  * @aggregator: the aggregator we're looking at
1689  * @lacp_fast: boolean. whether fast periodic should be used
1690  */
1691 static void ad_initialize_port(struct port *port, int lacp_fast)
1692 {
1693         static const struct port_params tmpl = {
1694                 .system_priority = 0xffff,
1695                 .key             = 1,
1696                 .port_number     = 1,
1697                 .port_priority   = 0xff,
1698                 .port_state      = 1,
1699         };
1700         static const struct lacpdu lacpdu = {
1701                 .subtype                = 0x01,
1702                 .version_number = 0x01,
1703                 .tlv_type_actor_info = 0x01,
1704                 .actor_information_length = 0x14,
1705                 .tlv_type_partner_info = 0x02,
1706                 .partner_information_length = 0x14,
1707                 .tlv_type_collector_info = 0x03,
1708                 .collector_information_length = 0x10,
1709                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1710         };
1711
1712         if (port) {
1713                 port->actor_port_number = 1;
1714                 port->actor_port_priority = 0xff;
1715                 port->actor_system = null_mac_addr;
1716                 port->actor_system_priority = 0xffff;
1717                 port->actor_port_aggregator_identifier = 0;
1718                 port->ntt = false;
1719                 port->actor_admin_port_key = 1;
1720                 port->actor_oper_port_key  = 1;
1721                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1722                                                AD_STATE_LACP_ACTIVITY;
1723                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1724                                                AD_STATE_LACP_ACTIVITY;
1725
1726                 if (lacp_fast)
1727                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1728
1729                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1730                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1731
1732                 port->is_enabled = true;
1733                 /* private parameters */
1734                 port->sm_vars = 0x3;
1735                 port->sm_rx_state = 0;
1736                 port->sm_rx_timer_counter = 0;
1737                 port->sm_periodic_state = 0;
1738                 port->sm_periodic_timer_counter = 0;
1739                 port->sm_mux_state = 0;
1740                 port->sm_mux_timer_counter = 0;
1741                 port->sm_tx_state = 0;
1742                 port->sm_tx_timer_counter = 0;
1743                 port->slave = NULL;
1744                 port->aggregator = NULL;
1745                 port->next_port_in_aggregator = NULL;
1746                 port->transaction_id = 0;
1747
1748                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1749         }
1750 }
1751
1752 /**
1753  * ad_enable_collecting_distributing - enable a port's transmit/receive
1754  * @port: the port we're looking at
1755  * @update_slave_arr: Does slave array need update?
1756  *
1757  * Enable @port if it's in an active aggregator
1758  */
1759 static void ad_enable_collecting_distributing(struct port *port,
1760                                               bool *update_slave_arr)
1761 {
1762         if (port->aggregator->is_active) {
1763                 pr_debug("Enabling port %d(LAG %d)\n",
1764                          port->actor_port_number,
1765                          port->aggregator->aggregator_identifier);
1766                 __enable_port(port);
1767                 /* Slave array needs update */
1768                 *update_slave_arr = true;
1769         }
1770 }
1771
1772 /**
1773  * ad_disable_collecting_distributing - disable a port's transmit/receive
1774  * @port: the port we're looking at
1775  * @update_slave_arr: Does slave array need update?
1776  */
1777 static void ad_disable_collecting_distributing(struct port *port,
1778                                                bool *update_slave_arr)
1779 {
1780         if (port->aggregator &&
1781             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1782                                &(null_mac_addr))) {
1783                 pr_debug("Disabling port %d(LAG %d)\n",
1784                          port->actor_port_number,
1785                          port->aggregator->aggregator_identifier);
1786                 __disable_port(port);
1787                 /* Slave array needs an update */
1788                 *update_slave_arr = true;
1789         }
1790 }
1791
1792 /**
1793  * ad_marker_info_received - handle receive of a Marker information frame
1794  * @marker_info: Marker info received
1795  * @port: the port we're looking at
1796  */
1797 static void ad_marker_info_received(struct bond_marker *marker_info,
1798         struct port *port)
1799 {
1800         struct bond_marker marker;
1801
1802         /* copy the received marker data to the response marker */
1803         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1804         /* change the marker subtype to marker response */
1805         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1806
1807         /* send the marker response */
1808         if (ad_marker_send(port, &marker) >= 0) {
1809                 pr_debug("Sent Marker Response on port %d\n",
1810                          port->actor_port_number);
1811         }
1812 }
1813
1814 /**
1815  * ad_marker_response_received - handle receive of a marker response frame
1816  * @marker: marker PDU received
1817  * @port: the port we're looking at
1818  *
1819  * This function does nothing since we decided not to implement send and handle
1820  * response for marker PDU's, in this stage, but only to respond to marker
1821  * information.
1822  */
1823 static void ad_marker_response_received(struct bond_marker *marker,
1824                                         struct port *port)
1825 {
1826         marker = NULL;
1827         port = NULL;
1828         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1829 }
1830
1831 /* ========= AD exported functions to the main bonding code ========= */
1832
1833 /* Check aggregators status in team every T seconds */
1834 #define AD_AGGREGATOR_SELECTION_TIMER  8
1835
1836 /**
1837  * bond_3ad_initiate_agg_selection - initate aggregator selection
1838  * @bond: bonding struct
1839  *
1840  * Set the aggregation selection timer, to initiate an agg selection in
1841  * the very near future.  Called during first initialization, and during
1842  * any down to up transitions of the bond.
1843  */
1844 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1845 {
1846         BOND_AD_INFO(bond).agg_select_timer = timeout;
1847 }
1848
1849 /**
1850  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1851  * @bond: bonding struct to work on
1852  * @tick_resolution: tick duration (millisecond resolution)
1853  *
1854  * Can be called only after the mac address of the bond is set.
1855  */
1856 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1857 {
1858         /* check that the bond is not initialized yet */
1859         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1860                                 bond->dev->dev_addr)) {
1861
1862                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1863
1864                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1865                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1866
1867                 /* initialize how many times this module is called in one
1868                  * second (should be about every 100ms)
1869                  */
1870                 ad_ticks_per_sec = tick_resolution;
1871
1872                 bond_3ad_initiate_agg_selection(bond,
1873                                                 AD_AGGREGATOR_SELECTION_TIMER *
1874                                                 ad_ticks_per_sec);
1875         }
1876 }
1877
1878 /**
1879  * bond_3ad_bind_slave - initialize a slave's port
1880  * @slave: slave struct to work on
1881  *
1882  * Returns:   0 on success
1883  *          < 0 on error
1884  */
1885 void bond_3ad_bind_slave(struct slave *slave)
1886 {
1887         struct bonding *bond = bond_get_bond_by_slave(slave);
1888         struct port *port;
1889         struct aggregator *aggregator;
1890
1891         /* check that the slave has not been initialized yet. */
1892         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1893
1894                 /* port initialization */
1895                 port = &(SLAVE_AD_INFO(slave)->port);
1896
1897                 ad_initialize_port(port, bond->params.lacp_fast);
1898
1899                 port->slave = slave;
1900                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
1901                 /* key is determined according to the link speed, duplex and user key(which
1902                  * is yet not supported)
1903                  */
1904                 port->actor_admin_port_key = 0;
1905                 port->actor_admin_port_key |= __get_duplex(port);
1906                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1907                 port->actor_oper_port_key = port->actor_admin_port_key;
1908                 /* if the port is not full duplex, then the port should be not
1909                  * lacp Enabled
1910                  */
1911                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1912                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1913                 /* actor system is the bond's system */
1914                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1915                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1916                  * lacpdu's are sent in one second)
1917                  */
1918                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1919                 port->aggregator = NULL;
1920                 port->next_port_in_aggregator = NULL;
1921
1922                 __disable_port(port);
1923
1924                 /* aggregator initialization */
1925                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1926
1927                 ad_initialize_agg(aggregator);
1928
1929                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1930                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1931                 aggregator->slave = slave;
1932                 aggregator->is_active = 0;
1933                 aggregator->num_of_ports = 0;
1934         }
1935 }
1936
1937 /**
1938  * bond_3ad_unbind_slave - deinitialize a slave's port
1939  * @slave: slave struct to work on
1940  *
1941  * Search for the aggregator that is related to this port, remove the
1942  * aggregator and assign another aggregator for other port related to it
1943  * (if any), and remove the port.
1944  */
1945 void bond_3ad_unbind_slave(struct slave *slave)
1946 {
1947         struct port *port, *prev_port, *temp_port;
1948         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1949         int select_new_active_agg = 0;
1950         struct bonding *bond = slave->bond;
1951         struct slave *slave_iter;
1952         struct list_head *iter;
1953         bool dummy_slave_update; /* Ignore this value as caller updates array */
1954
1955         /* Sync against bond_3ad_state_machine_handler() */
1956         spin_lock_bh(&bond->mode_lock);
1957         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1958         port = &(SLAVE_AD_INFO(slave)->port);
1959
1960         /* if slave is null, the whole port is not initialized */
1961         if (!port->slave) {
1962                 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
1963                             slave->dev->name);
1964                 goto out;
1965         }
1966
1967         netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
1968                    aggregator->aggregator_identifier);
1969
1970         /* Tell the partner that this port is not suitable for aggregation */
1971         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1972         __update_lacpdu_from_port(port);
1973         ad_lacpdu_send(port);
1974
1975         /* check if this aggregator is occupied */
1976         if (aggregator->lag_ports) {
1977                 /* check if there are other ports related to this aggregator
1978                  * except the port related to this slave(thats ensure us that
1979                  * there is a reason to search for new aggregator, and that we
1980                  * will find one
1981                  */
1982                 if ((aggregator->lag_ports != port) ||
1983                     (aggregator->lag_ports->next_port_in_aggregator)) {
1984                         /* find new aggregator for the related port(s) */
1985                         bond_for_each_slave(bond, slave_iter, iter) {
1986                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
1987                                 /* if the new aggregator is empty, or it is
1988                                  * connected to our port only
1989                                  */
1990                                 if (!new_aggregator->lag_ports ||
1991                                     ((new_aggregator->lag_ports == port) &&
1992                                      !new_aggregator->lag_ports->next_port_in_aggregator))
1993                                         break;
1994                         }
1995                         if (!slave_iter)
1996                                 new_aggregator = NULL;
1997
1998                         /* if new aggregator found, copy the aggregator's
1999                          * parameters and connect the related lag_ports to the
2000                          * new aggregator
2001                          */
2002                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2003                                 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2004                                            aggregator->aggregator_identifier,
2005                                            new_aggregator->aggregator_identifier);
2006
2007                                 if ((new_aggregator->lag_ports == port) &&
2008                                     new_aggregator->is_active) {
2009                                         netdev_info(bond->dev, "Removing an active aggregator\n");
2010                                          select_new_active_agg = 1;
2011                                 }
2012
2013                                 new_aggregator->is_individual = aggregator->is_individual;
2014                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2015                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2016                                 new_aggregator->partner_system = aggregator->partner_system;
2017                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2018                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2019                                 new_aggregator->receive_state = aggregator->receive_state;
2020                                 new_aggregator->transmit_state = aggregator->transmit_state;
2021                                 new_aggregator->lag_ports = aggregator->lag_ports;
2022                                 new_aggregator->is_active = aggregator->is_active;
2023                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2024
2025                                 /* update the information that is written on
2026                                  * the ports about the aggregator
2027                                  */
2028                                 for (temp_port = aggregator->lag_ports; temp_port;
2029                                      temp_port = temp_port->next_port_in_aggregator) {
2030                                         temp_port->aggregator = new_aggregator;
2031                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2032                                 }
2033
2034                                 ad_clear_agg(aggregator);
2035
2036                                 if (select_new_active_agg)
2037                                         ad_agg_selection_logic(__get_first_agg(port),
2038                                                                &dummy_slave_update);
2039                         } else {
2040                                 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2041                         }
2042                 } else {
2043                         /* in case that the only port related to this
2044                          * aggregator is the one we want to remove
2045                          */
2046                         select_new_active_agg = aggregator->is_active;
2047                         ad_clear_agg(aggregator);
2048                         if (select_new_active_agg) {
2049                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2050                                 /* select new active aggregator */
2051                                 temp_aggregator = __get_first_agg(port);
2052                                 if (temp_aggregator)
2053                                         ad_agg_selection_logic(temp_aggregator,
2054                                                                &dummy_slave_update);
2055                         }
2056                 }
2057         }
2058
2059         netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
2060
2061         /* find the aggregator that this port is connected to */
2062         bond_for_each_slave(bond, slave_iter, iter) {
2063                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2064                 prev_port = NULL;
2065                 /* search the port in the aggregator's related ports */
2066                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2067                      prev_port = temp_port,
2068                      temp_port = temp_port->next_port_in_aggregator) {
2069                         if (temp_port == port) {
2070                                 /* the aggregator found - detach the port from
2071                                  * this aggregator
2072                                  */
2073                                 if (prev_port)
2074                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2075                                 else
2076                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2077                                 temp_aggregator->num_of_ports--;
2078                                 if (temp_aggregator->num_of_ports == 0) {
2079                                         select_new_active_agg = temp_aggregator->is_active;
2080                                         ad_clear_agg(temp_aggregator);
2081                                         if (select_new_active_agg) {
2082                                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2083                                                 /* select new active aggregator */
2084                                                 ad_agg_selection_logic(__get_first_agg(port),
2085                                                                        &dummy_slave_update);
2086                                         }
2087                                 }
2088                                 break;
2089                         }
2090                 }
2091         }
2092         port->slave = NULL;
2093
2094 out:
2095         spin_unlock_bh(&bond->mode_lock);
2096 }
2097
2098 /**
2099  * bond_3ad_state_machine_handler - handle state machines timeout
2100  * @bond: bonding struct to work on
2101  *
2102  * The state machine handling concept in this module is to check every tick
2103  * which state machine should operate any function. The execution order is
2104  * round robin, so when we have an interaction between state machines, the
2105  * reply of one to each other might be delayed until next tick.
2106  *
2107  * This function also complete the initialization when the agg_select_timer
2108  * times out, and it selects an aggregator for the ports that are yet not
2109  * related to any aggregator, and selects the active aggregator for a bond.
2110  */
2111 void bond_3ad_state_machine_handler(struct work_struct *work)
2112 {
2113         struct bonding *bond = container_of(work, struct bonding,
2114                                             ad_work.work);
2115         struct aggregator *aggregator;
2116         struct list_head *iter;
2117         struct slave *slave;
2118         struct port *port;
2119         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2120         bool update_slave_arr = false;
2121
2122         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2123          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2124          * concurrently due to incoming LACPDU as well.
2125          */
2126         spin_lock_bh(&bond->mode_lock);
2127         rcu_read_lock();
2128
2129         /* check if there are any slaves */
2130         if (!bond_has_slaves(bond))
2131                 goto re_arm;
2132
2133         /* check if agg_select_timer timer after initialize is timed out */
2134         if (BOND_AD_INFO(bond).agg_select_timer &&
2135             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2136                 slave = bond_first_slave_rcu(bond);
2137                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2138
2139                 /* select the active aggregator for the bond */
2140                 if (port) {
2141                         if (!port->slave) {
2142                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2143                                                      bond->dev->name);
2144                                 goto re_arm;
2145                         }
2146
2147                         aggregator = __get_first_agg(port);
2148                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2149                 }
2150                 bond_3ad_set_carrier(bond);
2151         }
2152
2153         /* for each port run the state machines */
2154         bond_for_each_slave_rcu(bond, slave, iter) {
2155                 port = &(SLAVE_AD_INFO(slave)->port);
2156                 if (!port->slave) {
2157                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2158                                             bond->dev->name);
2159                         goto re_arm;
2160                 }
2161
2162                 ad_rx_machine(NULL, port);
2163                 ad_periodic_machine(port);
2164                 ad_port_selection_logic(port, &update_slave_arr);
2165                 ad_mux_machine(port, &update_slave_arr);
2166                 ad_tx_machine(port);
2167
2168                 /* turn off the BEGIN bit, since we already handled it */
2169                 if (port->sm_vars & AD_PORT_BEGIN)
2170                         port->sm_vars &= ~AD_PORT_BEGIN;
2171         }
2172
2173 re_arm:
2174         bond_for_each_slave_rcu(bond, slave, iter) {
2175                 if (slave->should_notify) {
2176                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2177                         break;
2178                 }
2179         }
2180         rcu_read_unlock();
2181         spin_unlock_bh(&bond->mode_lock);
2182
2183         if (update_slave_arr)
2184                 bond_slave_arr_work_rearm(bond, 0);
2185
2186         if (should_notify_rtnl && rtnl_trylock()) {
2187                 bond_slave_state_notify(bond);
2188                 rtnl_unlock();
2189         }
2190         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2191 }
2192
2193 /**
2194  * bond_3ad_rx_indication - handle a received frame
2195  * @lacpdu: received lacpdu
2196  * @slave: slave struct to work on
2197  * @length: length of the data received
2198  *
2199  * It is assumed that frames that were sent on this NIC don't returned as new
2200  * received frames (loopback). Since only the payload is given to this
2201  * function, it check for loopback.
2202  */
2203 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2204                                   u16 length)
2205 {
2206         struct port *port;
2207         int ret = RX_HANDLER_ANOTHER;
2208
2209         if (length >= sizeof(struct lacpdu)) {
2210
2211                 port = &(SLAVE_AD_INFO(slave)->port);
2212
2213                 if (!port->slave) {
2214                         net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2215                                              slave->dev->name, slave->bond->dev->name);
2216                         return ret;
2217                 }
2218
2219                 switch (lacpdu->subtype) {
2220                 case AD_TYPE_LACPDU:
2221                         ret = RX_HANDLER_CONSUMED;
2222                         netdev_dbg(slave->bond->dev,
2223                                    "Received LACPDU on port %d slave %s\n",
2224                                    port->actor_port_number,
2225                                    slave->dev->name);
2226                         /* Protect against concurrent state machines */
2227                         spin_lock(&slave->bond->mode_lock);
2228                         ad_rx_machine(lacpdu, port);
2229                         spin_unlock(&slave->bond->mode_lock);
2230                         break;
2231
2232                 case AD_TYPE_MARKER:
2233                         ret = RX_HANDLER_CONSUMED;
2234                         /* No need to convert fields to Little Endian since we
2235                          * don't use the marker's fields.
2236                          */
2237
2238                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2239                         case AD_MARKER_INFORMATION_SUBTYPE:
2240                                 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2241                                            port->actor_port_number);
2242                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2243                                 break;
2244
2245                         case AD_MARKER_RESPONSE_SUBTYPE:
2246                                 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2247                                            port->actor_port_number);
2248                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2249                                 break;
2250
2251                         default:
2252                                 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2253                                            port->actor_port_number);
2254                         }
2255                 }
2256         }
2257         return ret;
2258 }
2259
2260 /**
2261  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2262  * @slave: slave struct to work on
2263  *
2264  * Handle reselection of aggregator (if needed) for this port.
2265  */
2266 void bond_3ad_adapter_speed_changed(struct slave *slave)
2267 {
2268         struct port *port;
2269
2270         port = &(SLAVE_AD_INFO(slave)->port);
2271
2272         /* if slave is null, the whole port is not initialized */
2273         if (!port->slave) {
2274                 netdev_warn(slave->bond->dev, "speed changed for uninitialized port on %s\n",
2275                             slave->dev->name);
2276                 return;
2277         }
2278
2279         spin_lock_bh(&slave->bond->mode_lock);
2280
2281         port->actor_admin_port_key &= ~AD_SPEED_KEY_MASKS;
2282         port->actor_oper_port_key = port->actor_admin_port_key |=
2283                 (__get_link_speed(port) << 1);
2284         netdev_dbg(slave->bond->dev, "Port %d changed speed\n", port->actor_port_number);
2285         /* there is no need to reselect a new aggregator, just signal the
2286          * state machines to reinitialize
2287          */
2288         port->sm_vars |= AD_PORT_BEGIN;
2289
2290         spin_unlock_bh(&slave->bond->mode_lock);
2291 }
2292
2293 /**
2294  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2295  * @slave: slave struct to work on
2296  *
2297  * Handle reselection of aggregator (if needed) for this port.
2298  */
2299 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2300 {
2301         struct port *port;
2302
2303         port = &(SLAVE_AD_INFO(slave)->port);
2304
2305         /* if slave is null, the whole port is not initialized */
2306         if (!port->slave) {
2307                 netdev_warn(slave->bond->dev, "duplex changed for uninitialized port on %s\n",
2308                             slave->dev->name);
2309                 return;
2310         }
2311
2312         spin_lock_bh(&slave->bond->mode_lock);
2313
2314         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_MASKS;
2315         port->actor_oper_port_key = port->actor_admin_port_key |=
2316                 __get_duplex(port);
2317         netdev_dbg(slave->bond->dev, "Port %d slave %s changed duplex\n",
2318                    port->actor_port_number, slave->dev->name);
2319         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
2320                 port->sm_vars |= AD_PORT_LACP_ENABLED;
2321         /* there is no need to reselect a new aggregator, just signal the
2322          * state machines to reinitialize
2323          */
2324         port->sm_vars |= AD_PORT_BEGIN;
2325
2326         spin_unlock_bh(&slave->bond->mode_lock);
2327 }
2328
2329 /**
2330  * bond_3ad_handle_link_change - handle a slave's link status change indication
2331  * @slave: slave struct to work on
2332  * @status: whether the link is now up or down
2333  *
2334  * Handle reselection of aggregator (if needed) for this port.
2335  */
2336 void bond_3ad_handle_link_change(struct slave *slave, char link)
2337 {
2338         struct port *port;
2339
2340         port = &(SLAVE_AD_INFO(slave)->port);
2341
2342         /* if slave is null, the whole port is not initialized */
2343         if (!port->slave) {
2344                 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2345                             slave->dev->name);
2346                 return;
2347         }
2348
2349         spin_lock_bh(&slave->bond->mode_lock);
2350         /* on link down we are zeroing duplex and speed since
2351          * some of the adaptors(ce1000.lan) report full duplex/speed
2352          * instead of N/A(duplex) / 0(speed).
2353          *
2354          * on link up we are forcing recheck on the duplex and speed since
2355          * some of he adaptors(ce1000.lan) report.
2356          */
2357         if (link == BOND_LINK_UP) {
2358                 port->is_enabled = true;
2359                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_MASKS;
2360                 port->actor_oper_port_key = port->actor_admin_port_key |=
2361                         __get_duplex(port);
2362                 port->actor_admin_port_key &= ~AD_SPEED_KEY_MASKS;
2363                 port->actor_oper_port_key = port->actor_admin_port_key |=
2364                         (__get_link_speed(port) << 1);
2365         } else {
2366                 /* link has failed */
2367                 port->is_enabled = false;
2368                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_MASKS;
2369                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2370                                              ~AD_SPEED_KEY_MASKS);
2371         }
2372         netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2373                    port->actor_port_number,
2374                    link == BOND_LINK_UP ? "UP" : "DOWN");
2375         /* there is no need to reselect a new aggregator, just signal the
2376          * state machines to reinitialize
2377          */
2378         port->sm_vars |= AD_PORT_BEGIN;
2379
2380         spin_unlock_bh(&slave->bond->mode_lock);
2381
2382         /* RTNL is held and mode_lock is released so it's safe
2383          * to update slave_array here.
2384          */
2385         bond_update_slave_arr(slave->bond, NULL);
2386 }
2387
2388 /**
2389  * bond_3ad_set_carrier - set link state for bonding master
2390  * @bond - bonding structure
2391  *
2392  * if we have an active aggregator, we're up, if not, we're down.
2393  * Presumes that we cannot have an active aggregator if there are
2394  * no slaves with link up.
2395  *
2396  * This behavior complies with IEEE 802.3 section 43.3.9.
2397  *
2398  * Called by bond_set_carrier(). Return zero if carrier state does not
2399  * change, nonzero if it does.
2400  */
2401 int bond_3ad_set_carrier(struct bonding *bond)
2402 {
2403         struct aggregator *active;
2404         struct slave *first_slave;
2405         int ret = 1;
2406
2407         rcu_read_lock();
2408         first_slave = bond_first_slave_rcu(bond);
2409         if (!first_slave) {
2410                 ret = 0;
2411                 goto out;
2412         }
2413         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2414         if (active) {
2415                 /* are enough slaves available to consider link up? */
2416                 if (active->num_of_ports < bond->params.min_links) {
2417                         if (netif_carrier_ok(bond->dev)) {
2418                                 netif_carrier_off(bond->dev);
2419                                 goto out;
2420                         }
2421                 } else if (!netif_carrier_ok(bond->dev)) {
2422                         netif_carrier_on(bond->dev);
2423                         goto out;
2424                 }
2425         } else if (netif_carrier_ok(bond->dev)) {
2426                 netif_carrier_off(bond->dev);
2427         }
2428 out:
2429         rcu_read_unlock();
2430         return ret;
2431 }
2432
2433 /**
2434  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2435  * @bond: bonding struct to work on
2436  * @ad_info: ad_info struct to fill with the bond's info
2437  *
2438  * Returns:   0 on success
2439  *          < 0 on error
2440  */
2441 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2442                                    struct ad_info *ad_info)
2443 {
2444         struct aggregator *aggregator = NULL;
2445         struct list_head *iter;
2446         struct slave *slave;
2447         struct port *port;
2448
2449         bond_for_each_slave_rcu(bond, slave, iter) {
2450                 port = &(SLAVE_AD_INFO(slave)->port);
2451                 if (port->aggregator && port->aggregator->is_active) {
2452                         aggregator = port->aggregator;
2453                         break;
2454                 }
2455         }
2456
2457         if (!aggregator)
2458                 return -1;
2459
2460         ad_info->aggregator_id = aggregator->aggregator_identifier;
2461         ad_info->ports = aggregator->num_of_ports;
2462         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2463         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2464         ether_addr_copy(ad_info->partner_system,
2465                         aggregator->partner_system.mac_addr_value);
2466         return 0;
2467 }
2468
2469 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2470 {
2471         int ret;
2472
2473         rcu_read_lock();
2474         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2475         rcu_read_unlock();
2476
2477         return ret;
2478 }
2479
2480 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2481                          struct slave *slave)
2482 {
2483         struct lacpdu *lacpdu, _lacpdu;
2484
2485         if (skb->protocol != PKT_TYPE_LACPDU)
2486                 return RX_HANDLER_ANOTHER;
2487
2488         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2489         if (!lacpdu)
2490                 return RX_HANDLER_ANOTHER;
2491
2492         return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2493 }
2494
2495 /**
2496  * bond_3ad_update_lacp_rate - change the lacp rate
2497  * @bond - bonding struct
2498  *
2499  * When modify lacp_rate parameter via sysfs,
2500  * update actor_oper_port_state of each port.
2501  *
2502  * Hold bond->mode_lock,
2503  * so we can modify port->actor_oper_port_state,
2504  * no matter bond is up or down.
2505  */
2506 void bond_3ad_update_lacp_rate(struct bonding *bond)
2507 {
2508         struct port *port = NULL;
2509         struct list_head *iter;
2510         struct slave *slave;
2511         int lacp_fast;
2512
2513         lacp_fast = bond->params.lacp_fast;
2514         spin_lock_bh(&bond->mode_lock);
2515         bond_for_each_slave(bond, slave, iter) {
2516                 port = &(SLAVE_AD_INFO(slave)->port);
2517                 if (lacp_fast)
2518                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2519                 else
2520                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2521         }
2522         spin_unlock_bh(&bond->mode_lock);
2523 }