drivers/net/bonding/bond_3ad.c

   1 /*
   2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  */
  22
  23 #include <linux/skbuff.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/if_bonding.h>
  30 #include <linux/pkt_sched.h>
  31 #include <net/net_namespace.h>
  32 #include <net/bonding.h>
  33 #include <net/bond_3ad.h>
  34
  35 /* General definitions */
  36 #define AD_SHORT_TIMEOUT           1
  37 #define AD_LONG_TIMEOUT            0
  38 #define AD_STANDBY                 0x2
  39 #define AD_MAX_TX_IN_SECOND        3
  40 #define AD_COLLECTOR_MAX_DELAY     0
  41
  42 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  43 #define AD_FAST_PERIODIC_TIME      1
  44 #define AD_SLOW_PERIODIC_TIME      30
  45 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  46 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  47 #define AD_CHURN_DETECTION_TIME    60
  48 #define AD_AGGREGATE_WAIT_TIME     2
  49
  50 /* Port state definitions (43.4.2.2 in the 802.3ad standard) */
  51 #define AD_STATE_LACP_ACTIVITY   0x1
  52 #define AD_STATE_LACP_TIMEOUT    0x2
  53 #define AD_STATE_AGGREGATION     0x4
  54 #define AD_STATE_SYNCHRONIZATION 0x8
  55 #define AD_STATE_COLLECTING      0x10
  56 #define AD_STATE_DISTRIBUTING    0x20
  57 #define AD_STATE_DEFAULTED       0x40
  58 #define AD_STATE_EXPIRED         0x80
  59
  60 /* Port Variables definitions used by the State Machines (43.4.7 in the
  61  * 802.3ad standard)
  62  */
  63 #define AD_PORT_BEGIN           0x1
  64 #define AD_PORT_LACP_ENABLED    0x2
  65 #define AD_PORT_ACTOR_CHURN     0x4
  66 #define AD_PORT_PARTNER_CHURN   0x8
  67 #define AD_PORT_READY           0x10
  68 #define AD_PORT_READY_N         0x20
  69 #define AD_PORT_MATCHED         0x40
  70 #define AD_PORT_STANDBY         0x80
  71 #define AD_PORT_SELECTED        0x100
  72 #define AD_PORT_MOVED           0x200
  73 #define AD_PORT_CHURNED         (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
  74
  75 /* Port Key definitions
  76  * key is determined according to the link speed, duplex and
  77  * user key (which is yet not supported)
  78  *           --------------------------------------------------------------
  79  * Port key  | User key (10 bits)           | Speed (5 bits)      | Duplex|
  80  *           --------------------------------------------------------------
  81  *           |15                           6|5                   1|0
  82  */
  83 #define  AD_DUPLEX_KEY_MASKS    0x1
  84 #define  AD_SPEED_KEY_MASKS     0x3E
  85 #define  AD_USER_KEY_MASKS      0xFFC0
  86
  87 enum ad_link_speed_type {
  88         AD_LINK_SPEED_1MBPS = 1,
  89         AD_LINK_SPEED_10MBPS,
  90         AD_LINK_SPEED_100MBPS,
  91         AD_LINK_SPEED_1000MBPS,
  92         AD_LINK_SPEED_2500MBPS,
  93         AD_LINK_SPEED_5000MBPS,
  94         AD_LINK_SPEED_10000MBPS,
  95         AD_LINK_SPEED_14000MBPS,
  96         AD_LINK_SPEED_20000MBPS,
  97         AD_LINK_SPEED_25000MBPS,
  98         AD_LINK_SPEED_40000MBPS,
  99         AD_LINK_SPEED_50000MBPS,
 100         AD_LINK_SPEED_56000MBPS,
 101         AD_LINK_SPEED_100000MBPS,
 102 };
 103
 104 /* compare MAC addresses */
 105 #define MAC_ADDRESS_EQUAL(A, B) \
 106         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
 107
 108 static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
 109         0, 0, 0, 0, 0, 0
 110 };
 111 static u16 ad_ticks_per_sec;
 112 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
 113
 114 static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned =
 115         MULTICAST_LACPDU_ADDR;
 116
 117 /* ================= main 802.3ad protocol functions ================== */
 118 static int ad_lacpdu_send(struct port *port);
 119 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 120 static void ad_mux_machine(struct port *port, bool *update_slave_arr);
 121 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 122 static void ad_tx_machine(struct port *port);
 123 static void ad_periodic_machine(struct port *port);
 124 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
 125 static void ad_agg_selection_logic(struct aggregator *aggregator,
 126                                    bool *update_slave_arr);
 127 static void ad_clear_agg(struct aggregator *aggregator);
 128 static void ad_initialize_agg(struct aggregator *aggregator);
 129 static void ad_initialize_port(struct port *port, int lacp_fast);
 130 static void ad_enable_collecting_distributing(struct port *port,
 131                                               bool *update_slave_arr);
 132 static void ad_disable_collecting_distributing(struct port *port,
 133                                                bool *update_slave_arr);
 134 static void ad_marker_info_received(struct bond_marker *marker_info,
 135                                     struct port *port);
 136 static void ad_marker_response_received(struct bond_marker *marker,
 137                                         struct port *port);
 138 static void ad_update_actor_keys(struct port *port, bool reset);
 139
 140
 141 /* ================= api to bonding and kernel code ================== */
 142
 143 /**
 144  * __get_bond_by_port - get the port's bonding struct
 145  * @port: the port we're looking at
 146  *
 147  * Return @port's bonding struct, or %NULL if it can't be found.
 148  */
 149 static inline struct bonding *__get_bond_by_port(struct port *port)
 150 {
 151         if (port->slave == NULL)
 152                 return NULL;
 153
 154         return bond_get_bond_by_slave(port->slave);
 155 }
 156
 157 /**
 158  * __get_first_agg - get the first aggregator in the bond
 159  * @bond: the bond we're looking at
 160  *
 161  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 162  * found.
 163  * The caller must hold RCU or RTNL lock.
 164  */
 165 static inline struct aggregator *__get_first_agg(struct port *port)
 166 {
 167         struct bonding *bond = __get_bond_by_port(port);
 168         struct slave *first_slave;
 169         struct aggregator *agg;
 170
 171         /* If there's no bond for this port, or bond has no slaves */
 172         if (bond == NULL)
 173                 return NULL;
 174
 175         rcu_read_lock();
 176         first_slave = bond_first_slave_rcu(bond);
 177         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 178         rcu_read_unlock();
 179
 180         return agg;
 181 }
 182
 183 /**
 184  * __agg_has_partner - see if we have a partner
 185  * @agg: the agregator we're looking at
 186  *
 187  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 188  * address for the partner). Return 0 if not.
 189  */
 190 static inline int __agg_has_partner(struct aggregator *agg)
 191 {
 192         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 193 }
 194
 195 /**
 196  * __disable_port - disable the port's slave
 197  * @port: the port we're looking at
 198  */
 199 static inline void __disable_port(struct port *port)
 200 {
 201         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 202 }
 203
 204 /**
 205  * __enable_port - enable the port's slave, if it's up
 206  * @port: the port we're looking at
 207  */
 208 static inline void __enable_port(struct port *port)
 209 {
 210         struct slave *slave = port->slave;
 211
 212         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 213                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 214 }
 215
 216 /**
 217  * __port_is_enabled - check if the port's slave is in active state
 218  * @port: the port we're looking at
 219  */
 220 static inline int __port_is_enabled(struct port *port)
 221 {
 222         return bond_is_active_slave(port->slave);
 223 }
 224
 225 /**
 226  * __get_agg_selection_mode - get the aggregator selection mode
 227  * @port: the port we're looking at
 228  *
 229  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 230  */
 231 static inline u32 __get_agg_selection_mode(struct port *port)
 232 {
 233         struct bonding *bond = __get_bond_by_port(port);
 234
 235         if (bond == NULL)
 236                 return BOND_AD_STABLE;
 237
 238         return bond->params.ad_select;
 239 }
 240
 241 /**
 242  * __check_agg_selection_timer - check if the selection timer has expired
 243  * @port: the port we're looking at
 244  */
 245 static inline int __check_agg_selection_timer(struct port *port)
 246 {
 247         struct bonding *bond = __get_bond_by_port(port);
 248
 249         if (bond == NULL)
 250                 return 0;
 251
 252         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 253 }
 254
 255 /**
 256  * __get_link_speed - get a port's speed
 257  * @port: the port we're looking at
 258  *
 259  * Return @port's speed in 802.3ad enum format. i.e. one of:
 260  *     0,
 261  *     %AD_LINK_SPEED_10MBPS,
 262  *     %AD_LINK_SPEED_100MBPS,
 263  *     %AD_LINK_SPEED_1000MBPS,
 264  *     %AD_LINK_SPEED_2500MBPS,
 265  *     %AD_LINK_SPEED_5000MBPS,
 266  *     %AD_LINK_SPEED_10000MBPS
 267  *     %AD_LINK_SPEED_14000MBPS,
 268  *     %AD_LINK_SPEED_20000MBPS
 269  *     %AD_LINK_SPEED_25000MBPS
 270  *     %AD_LINK_SPEED_40000MBPS
 271  *     %AD_LINK_SPEED_50000MBPS
 272  *     %AD_LINK_SPEED_56000MBPS
 273  *     %AD_LINK_SPEED_100000MBPS
 274  */
 275 static u16 __get_link_speed(struct port *port)
 276 {
 277         struct slave *slave = port->slave;
 278         u16 speed;
 279
 280         /* this if covers only a special case: when the configuration starts
 281          * with link down, it sets the speed to 0.
 282          * This is done in spite of the fact that the e100 driver reports 0
 283          * to be compatible with MVT in the future.
 284          */
 285         if (slave->link != BOND_LINK_UP)
 286                 speed = 0;
 287         else {
 288                 switch (slave->speed) {
 289                 case SPEED_10:
 290                         speed = AD_LINK_SPEED_10MBPS;
 291                         break;
 292
 293                 case SPEED_100:
 294                         speed = AD_LINK_SPEED_100MBPS;
 295                         break;
 296
 297                 case SPEED_1000:
 298                         speed = AD_LINK_SPEED_1000MBPS;
 299                         break;
 300
 301                 case SPEED_2500:
 302                         speed = AD_LINK_SPEED_2500MBPS;
 303                         break;
 304
 305                 case SPEED_5000:
 306                         speed = AD_LINK_SPEED_5000MBPS;
 307                         break;
 308
 309                 case SPEED_10000:
 310                         speed = AD_LINK_SPEED_10000MBPS;
 311                         break;
 312
 313                 case SPEED_14000:
 314                         speed = AD_LINK_SPEED_14000MBPS;
 315                         break;
 316
 317                 case SPEED_20000:
 318                         speed = AD_LINK_SPEED_20000MBPS;
 319                         break;
 320
 321                 case SPEED_25000:
 322                         speed = AD_LINK_SPEED_25000MBPS;
 323                         break;
 324
 325                 case SPEED_40000:
 326                         speed = AD_LINK_SPEED_40000MBPS;
 327                         break;
 328
 329                 case SPEED_50000:
 330                         speed = AD_LINK_SPEED_50000MBPS;
 331                         break;
 332
 333                 case SPEED_56000:
 334                         speed = AD_LINK_SPEED_56000MBPS;
 335                         break;
 336
 337                 case SPEED_100000:
 338                         speed = AD_LINK_SPEED_100000MBPS;
 339                         break;
 340
 341                 default:
 342                         /* unknown speed value from ethtool. shouldn't happen */
 343                         speed = 0;
 344                         break;
 345                 }
 346         }
 347
 348         netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
 349                    port->actor_port_number, speed);
 350         return speed;
 351 }
 352
 353 /**
 354  * __get_duplex - get a port's duplex
 355  * @port: the port we're looking at
 356  *
 357  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 358  *     0x01 if in full duplex
 359  *     0x00 otherwise
 360  */
 361 static u8 __get_duplex(struct port *port)
 362 {
 363         struct slave *slave = port->slave;
 364         u8 retval = 0x0;
 365
 366         /* handling a special case: when the configuration starts with
 367          * link down, it sets the duplex to 0.
 368          */
 369         if (slave->link == BOND_LINK_UP) {
 370                 switch (slave->duplex) {
 371                 case DUPLEX_FULL:
 372                         retval = 0x1;
 373                         netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
 374                                    port->actor_port_number);
 375                         break;
 376                 case DUPLEX_HALF:
 377                 default:
 378                         retval = 0x0;
 379                         netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
 380                                    port->actor_port_number);
 381                         break;
 382                 }
 383         }
 384         return retval;
 385 }
 386
 387 static void __ad_actor_update_port(struct port *port)
 388 {
 389         const struct bonding *bond = bond_get_bond_by_slave(port->slave);
 390
 391         port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
 392         port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
 393 }
 394
 395 /* Conversions */
 396
 397 /**
 398  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 399  * @timer_type: which timer to operate
 400  * @par: timer parameter. see below
 401  *
 402  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 403  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 404  *                                                   %SLOW_PERIODIC_TIME.
 405  */
 406 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 407 {
 408         u16 retval = 0; /* to silence the compiler */
 409
 410         switch (timer_type) {
 411         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 412                 if (par)
 413                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 414                 else
 415                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 416                 break;
 417         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 418                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 419                 break;
 420         case AD_PERIODIC_TIMER:         /* for periodic machine */
 421                 retval = (par*ad_ticks_per_sec); /* long timeout */
 422                 break;
 423         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 424                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 425                 break;
 426         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 427                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 428                 break;
 429         }
 430
 431         return retval;
 432 }
 433
 434
 435 /* ================= ad_rx_machine helper functions ================== */
 436
 437 /**
 438  * __choose_matched - update a port's matched variable from a received lacpdu
 439  * @lacpdu: the lacpdu we've received
 440  * @port: the port we're looking at
 441  *
 442  * Update the value of the matched variable, using parameter values from a
 443  * newly received lacpdu. Parameter values for the partner carried in the
 444  * received PDU are compared with the corresponding operational parameter
 445  * values for the actor. Matched is set to TRUE if all of these parameters
 446  * match and the PDU parameter partner_state.aggregation has the same value as
 447  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 448  * in the aggregation. Matched is also set to TRUE if the value of
 449  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 450  * an individual link and lacp will actively maintain the link. Otherwise,
 451  * matched is set to FALSE. LACP is considered to be actively maintaining the
 452  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 453  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 454  * partner_state.lacp_activity variables are TRUE.
 455  *
 456  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 457  * used here to implement the language from 802.3ad 43.4.9 that requires
 458  * recordPDU to "match" the LACPDU parameters to the stored values.
 459  */
 460 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 461 {
 462         /* check if all parameters are alike
 463          * or this is individual link(aggregation == FALSE)
 464          * then update the state machine Matched variable.
 465          */
 466         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 467              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 468              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 469              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 470              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 471              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 472             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 473                 ) {
 474                 port->sm_vars |= AD_PORT_MATCHED;
 475         } else {
 476                 port->sm_vars &= ~AD_PORT_MATCHED;
 477         }
 478 }
 479
 480 /**
 481  * __record_pdu - record parameters from a received lacpdu
 482  * @lacpdu: the lacpdu we've received
 483  * @port: the port we're looking at
 484  *
 485  * Record the parameter values for the Actor carried in a received lacpdu as
 486  * the current partner operational parameter values and sets
 487  * actor_oper_port_state.defaulted to FALSE.
 488  */
 489 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 490 {
 491         if (lacpdu && port) {
 492                 struct port_params *partner = &port->partner_oper;
 493
 494                 __choose_matched(lacpdu, port);
 495                 /* record the new parameter values for the partner
 496                  * operational
 497                  */
 498                 partner->port_number = ntohs(lacpdu->actor_port);
 499                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 500                 partner->system = lacpdu->actor_system;
 501                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 502                 partner->key = ntohs(lacpdu->actor_key);
 503                 partner->port_state = lacpdu->actor_state;
 504
 505                 /* set actor_oper_port_state.defaulted to FALSE */
 506                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 507
 508                 /* set the partner sync. to on if the partner is sync,
 509                  * and the port is matched
 510                  */
 511                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 512                     (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 513                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 514                         pr_debug("%s partner sync=1\n", port->slave->dev->name);
 515                 } else {
 516                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 517                         pr_debug("%s partner sync=0\n", port->slave->dev->name);
 518                 }
 519         }
 520 }
 521
 522 /**
 523  * __record_default - record default parameters
 524  * @port: the port we're looking at
 525  *
 526  * This function records the default parameter values for the partner carried
 527  * in the Partner Admin parameters as the current partner operational parameter
 528  * values and sets actor_oper_port_state.defaulted to TRUE.
 529  */
 530 static void __record_default(struct port *port)
 531 {
 532         if (port) {
 533                 /* record the partner admin parameters */
 534                 memcpy(&port->partner_oper, &port->partner_admin,
 535                        sizeof(struct port_params));
 536
 537                 /* set actor_oper_port_state.defaulted to true */
 538                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 539         }
 540 }
 541
 542 /**
 543  * __update_selected - update a port's Selected variable from a received lacpdu
 544  * @lacpdu: the lacpdu we've received
 545  * @port: the port we're looking at
 546  *
 547  * Update the value of the selected variable, using parameter values from a
 548  * newly received lacpdu. The parameter values for the Actor carried in the
 549  * received PDU are compared with the corresponding operational parameter
 550  * values for the ports partner. If one or more of the comparisons shows that
 551  * the value(s) received in the PDU differ from the current operational values,
 552  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 553  * set to out_of_sync. Otherwise, selected remains unchanged.
 554  */
 555 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 556 {
 557         if (lacpdu && port) {
 558                 const struct port_params *partner = &port->partner_oper;
 559
 560                 /* check if any parameter is different then
 561                  * update the state machine selected variable.
 562                  */
 563                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 564                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 565                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 566                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 567                     ntohs(lacpdu->actor_key) != partner->key ||
 568                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 569                         port->sm_vars &= ~AD_PORT_SELECTED;
 570                 }
 571         }
 572 }
 573
 574 /**
 575  * __update_default_selected - update a port's Selected variable from Partner
 576  * @port: the port we're looking at
 577  *
 578  * This function updates the value of the selected variable, using the partner
 579  * administrative parameter values. The administrative values are compared with
 580  * the corresponding operational parameter values for the partner. If one or
 581  * more of the comparisons shows that the administrative value(s) differ from
 582  * the current operational values, then Selected is set to FALSE and
 583  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 584  * Selected remains unchanged.
 585  */
 586 static void __update_default_selected(struct port *port)
 587 {
 588         if (port) {
 589                 const struct port_params *admin = &port->partner_admin;
 590                 const struct port_params *oper = &port->partner_oper;
 591
 592                 /* check if any parameter is different then
 593                  * update the state machine selected variable.
 594                  */
 595                 if (admin->port_number != oper->port_number ||
 596                     admin->port_priority != oper->port_priority ||
 597                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 598                     admin->system_priority != oper->system_priority ||
 599                     admin->key != oper->key ||
 600                     (admin->port_state & AD_STATE_AGGREGATION)
 601                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 602                         port->sm_vars &= ~AD_PORT_SELECTED;
 603                 }
 604         }
 605 }
 606
 607 /**
 608  * __update_ntt - update a port's ntt variable from a received lacpdu
 609  * @lacpdu: the lacpdu we've received
 610  * @port: the port we're looking at
 611  *
 612  * Updates the value of the ntt variable, using parameter values from a newly
 613  * received lacpdu. The parameter values for the partner carried in the
 614  * received PDU are compared with the corresponding operational parameter
 615  * values for the Actor. If one or more of the comparisons shows that the
 616  * value(s) received in the PDU differ from the current operational values,
 617  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 618  */
 619 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 620 {
 621         /* validate lacpdu and port */
 622         if (lacpdu && port) {
 623                 /* check if any parameter is different then
 624                  * update the port->ntt.
 625                  */
 626                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 627                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 628                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 629                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 630                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 631                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 632                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 633                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 634                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 635                    ) {
 636                         port->ntt = true;
 637                 }
 638         }
 639 }
 640
 641 /**
 642  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 643  * @aggregator: the aggregator we're looking at
 644  *
 645  */
 646 static int __agg_ports_are_ready(struct aggregator *aggregator)
 647 {
 648         struct port *port;
 649         int retval = 1;
 650
 651         if (aggregator) {
 652                 /* scan all ports in this aggregator to verfy if they are
 653                  * all ready.
 654                  */
 655                 for (port = aggregator->lag_ports;
 656                      port;
 657                      port = port->next_port_in_aggregator) {
 658                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 659                                 retval = 0;
 660                                 break;
 661                         }
 662                 }
 663         }
 664
 665         return retval;
 666 }
 667
 668 /**
 669  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 670  * @aggregator: the aggregator we're looking at
 671  * @val: Should the ports' ready bit be set on or off
 672  *
 673  */
 674 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 675 {
 676         struct port *port;
 677
 678         for (port = aggregator->lag_ports; port;
 679              port = port->next_port_in_aggregator) {
 680                 if (val)
 681                         port->sm_vars |= AD_PORT_READY;
 682                 else
 683                         port->sm_vars &= ~AD_PORT_READY;
 684         }
 685 }
 686
 687 static int __agg_active_ports(struct aggregator *agg)
 688 {
 689         struct port *port;
 690         int active = 0;
 691
 692         for (port = agg->lag_ports; port;
 693              port = port->next_port_in_aggregator) {
 694                 if (port->is_enabled)
 695                         active++;
 696         }
 697
 698         return active;
 699 }
 700
 701 /**
 702  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 703  * @aggregator: the aggregator we're looking at
 704  *
 705  */
 706 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 707 {
 708         int nports = __agg_active_ports(aggregator);
 709         u32 bandwidth = 0;
 710
 711         if (nports) {
 712                 switch (__get_link_speed(aggregator->lag_ports)) {
 713                 case AD_LINK_SPEED_1MBPS:
 714                         bandwidth = nports;
 715                         break;
 716                 case AD_LINK_SPEED_10MBPS:
 717                         bandwidth = nports * 10;
 718                         break;
 719                 case AD_LINK_SPEED_100MBPS:
 720                         bandwidth = nports * 100;
 721                         break;
 722                 case AD_LINK_SPEED_1000MBPS:
 723                         bandwidth = nports * 1000;
 724                         break;
 725                 case AD_LINK_SPEED_2500MBPS:
 726                         bandwidth = nports * 2500;
 727                         break;
 728                 case AD_LINK_SPEED_5000MBPS:
 729                         bandwidth = nports * 5000;
 730                         break;
 731                 case AD_LINK_SPEED_10000MBPS:
 732                         bandwidth = nports * 10000;
 733                         break;
 734                 case AD_LINK_SPEED_14000MBPS:
 735                         bandwidth = nports * 14000;
 736                         break;
 737                 case AD_LINK_SPEED_20000MBPS:
 738                         bandwidth = nports * 20000;
 739                         break;
 740                 case AD_LINK_SPEED_25000MBPS:
 741                         bandwidth = nports * 25000;
 742                         break;
 743                 case AD_LINK_SPEED_40000MBPS:
 744                         bandwidth = nports * 40000;
 745                         break;
 746                 case AD_LINK_SPEED_50000MBPS:
 747                         bandwidth = nports * 50000;
 748                         break;
 749                 case AD_LINK_SPEED_56000MBPS:
 750                         bandwidth = nports * 56000;
 751                         break;
 752                 case AD_LINK_SPEED_100000MBPS:
 753                         bandwidth = nports * 100000;
 754                         break;
 755                 default:
 756                         bandwidth = 0; /* to silence the compiler */
 757                 }
 758         }
 759         return bandwidth;
 760 }
 761
 762 /**
 763  * __get_active_agg - get the current active aggregator
 764  * @aggregator: the aggregator we're looking at
 765  *
 766  * Caller must hold RCU lock.
 767  */
 768 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 769 {
 770         struct bonding *bond = aggregator->slave->bond;
 771         struct list_head *iter;
 772         struct slave *slave;
 773
 774         bond_for_each_slave_rcu(bond, slave, iter)
 775                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 776                         return &(SLAVE_AD_INFO(slave)->aggregator);
 777
 778         return NULL;
 779 }
 780
 781 /**
 782  * __update_lacpdu_from_port - update a port's lacpdu fields
 783  * @port: the port we're looking at
 784  */
 785 static inline void __update_lacpdu_from_port(struct port *port)
 786 {
 787         struct lacpdu *lacpdu = &port->lacpdu;
 788         const struct port_params *partner = &port->partner_oper;
 789
 790         /* update current actual Actor parameters
 791          * lacpdu->subtype                   initialized
 792          * lacpdu->version_number            initialized
 793          * lacpdu->tlv_type_actor_info       initialized
 794          * lacpdu->actor_information_length  initialized
 795          */
 796
 797         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 798         lacpdu->actor_system = port->actor_system;
 799         lacpdu->actor_key = htons(port->actor_oper_port_key);
 800         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 801         lacpdu->actor_port = htons(port->actor_port_number);
 802         lacpdu->actor_state = port->actor_oper_port_state;
 803         pr_debug("update lacpdu: %s, actor port state %x\n",
 804                  port->slave->dev->name, port->actor_oper_port_state);
 805
 806         /* lacpdu->reserved_3_1              initialized
 807          * lacpdu->tlv_type_partner_info     initialized
 808          * lacpdu->partner_information_length initialized
 809          */
 810
 811         lacpdu->partner_system_priority = htons(partner->system_priority);
 812         lacpdu->partner_system = partner->system;
 813         lacpdu->partner_key = htons(partner->key);
 814         lacpdu->partner_port_priority = htons(partner->port_priority);
 815         lacpdu->partner_port = htons(partner->port_number);
 816         lacpdu->partner_state = partner->port_state;
 817
 818         /* lacpdu->reserved_3_2              initialized
 819          * lacpdu->tlv_type_collector_info   initialized
 820          * lacpdu->collector_information_length initialized
 821          * collector_max_delay                initialized
 822          * reserved_12[12]                   initialized
 823          * tlv_type_terminator               initialized
 824          * terminator_length                 initialized
 825          * reserved_50[50]                   initialized
 826          */
 827 }
 828
 829 /* ================= main 802.3ad protocol code ========================= */
 830
 831 /**
 832  * ad_lacpdu_send - send out a lacpdu packet on a given port
 833  * @port: the port we're looking at
 834  *
 835  * Returns:   0 on success
 836  *          < 0 on error
 837  */
 838 static int ad_lacpdu_send(struct port *port)
 839 {
 840         struct slave *slave = port->slave;
 841         struct sk_buff *skb;
 842         struct lacpdu_header *lacpdu_header;
 843         int length = sizeof(struct lacpdu_header);
 844
 845         skb = dev_alloc_skb(length);
 846         if (!skb)
 847                 return -ENOMEM;
 848
 849         skb->dev = slave->dev;
 850         skb_reset_mac_header(skb);
 851         skb->network_header = skb->mac_header + ETH_HLEN;
 852         skb->protocol = PKT_TYPE_LACPDU;
 853         skb->priority = TC_PRIO_CONTROL;
 854
 855         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 856
 857         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 858         /* Note: source address is set to be the member's PERMANENT address,
 859          * because we use it to identify loopback lacpdus in receive.
 860          */
 861         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 862         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 863
 864         lacpdu_header->lacpdu = port->lacpdu;
 865
 866         dev_queue_xmit(skb);
 867
 868         return 0;
 869 }
 870
 871 /**
 872  * ad_marker_send - send marker information/response on a given port
 873  * @port: the port we're looking at
 874  * @marker: marker data to send
 875  *
 876  * Returns:   0 on success
 877  *          < 0 on error
 878  */
 879 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 880 {
 881         struct slave *slave = port->slave;
 882         struct sk_buff *skb;
 883         struct bond_marker_header *marker_header;
 884         int length = sizeof(struct bond_marker_header);
 885
 886         skb = dev_alloc_skb(length + 16);
 887         if (!skb)
 888                 return -ENOMEM;
 889
 890         skb_reserve(skb, 16);
 891
 892         skb->dev = slave->dev;
 893         skb_reset_mac_header(skb);
 894         skb->network_header = skb->mac_header + ETH_HLEN;
 895         skb->protocol = PKT_TYPE_LACPDU;
 896
 897         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 898
 899         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 900         /* Note: source address is set to be the member's PERMANENT address,
 901          * because we use it to identify loopback MARKERs in receive.
 902          */
 903         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 904         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 905
 906         marker_header->marker = *marker;
 907
 908         dev_queue_xmit(skb);
 909
 910         return 0;
 911 }
 912
 913 /**
 914  * ad_mux_machine - handle a port's mux state machine
 915  * @port: the port we're looking at
 916  * @update_slave_arr: Does slave array need update?
 917  */
 918 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 919 {
 920         mux_states_t last_state;
 921
 922         /* keep current State Machine state to compare later if it was
 923          * changed
 924          */
 925         last_state = port->sm_mux_state;
 926
 927         if (port->sm_vars & AD_PORT_BEGIN) {
 928                 port->sm_mux_state = AD_MUX_DETACHED;
 929         } else {
 930                 switch (port->sm_mux_state) {
 931                 case AD_MUX_DETACHED:
 932                         if ((port->sm_vars & AD_PORT_SELECTED)
 933                             || (port->sm_vars & AD_PORT_STANDBY))
 934                                 /* if SELECTED or STANDBY */
 935                                 port->sm_mux_state = AD_MUX_WAITING;
 936                         break;
 937                 case AD_MUX_WAITING:
 938                         /* if SELECTED == FALSE return to DETACH state */
 939                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 940                                 port->sm_vars &= ~AD_PORT_READY_N;
 941                                 /* in order to withhold the Selection Logic to
 942                                  * check all ports READY_N value every callback
 943                                  * cycle to update ready variable, we check
 944                                  * READY_N and update READY here
 945                                  */
 946                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 947                                 port->sm_mux_state = AD_MUX_DETACHED;
 948                                 break;
 949                         }
 950
 951                         /* check if the wait_while_timer expired */
 952                         if (port->sm_mux_timer_counter
 953                             && !(--port->sm_mux_timer_counter))
 954                                 port->sm_vars |= AD_PORT_READY_N;
 955
 956                         /* in order to withhold the selection logic to check
 957                          * all ports READY_N value every callback cycle to
 958                          * update ready variable, we check READY_N and update
 959                          * READY here
 960                          */
 961                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 962
 963                         /* if the wait_while_timer expired, and the port is
 964                          * in READY state, move to ATTACHED state
 965                          */
 966                         if ((port->sm_vars & AD_PORT_READY)
 967                             && !port->sm_mux_timer_counter)
 968                                 port->sm_mux_state = AD_MUX_ATTACHED;
 969                         break;
 970                 case AD_MUX_ATTACHED:
 971                         /* check also if agg_select_timer expired (so the
 972                          * edable port will take place only after this timer)
 973                          */
 974                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 975                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 976                             !__check_agg_selection_timer(port)) {
 977                                 if (port->aggregator->is_active)
 978                                         port->sm_mux_state =
 979                                             AD_MUX_COLLECTING_DISTRIBUTING;
 980                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 981                                    (port->sm_vars & AD_PORT_STANDBY)) {
 982                                 /* if UNSELECTED or STANDBY */
 983                                 port->sm_vars &= ~AD_PORT_READY_N;
 984                                 /* in order to withhold the selection logic to
 985                                  * check all ports READY_N value every callback
 986                                  * cycle to update ready variable, we check
 987                                  * READY_N and update READY here
 988                                  */
 989                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 990                                 port->sm_mux_state = AD_MUX_DETACHED;
 991                         } else if (port->aggregator->is_active) {
 992                                 port->actor_oper_port_state |=
 993                                     AD_STATE_SYNCHRONIZATION;
 994                         }
 995                         break;
 996                 case AD_MUX_COLLECTING_DISTRIBUTING:
 997                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
 998                             (port->sm_vars & AD_PORT_STANDBY) ||
 999                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
1000                             !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
1001                                 port->sm_mux_state = AD_MUX_ATTACHED;
1002                         } else {
1003                                 /* if port state hasn't changed make
1004                                  * sure that a collecting distributing
1005                                  * port in an active aggregator is enabled
1006                                  */
1007                                 if (port->aggregator &&
1008                                     port->aggregator->is_active &&
1009                                     !__port_is_enabled(port)) {
1010
1011                                         __enable_port(port);
1012                                 }
1013                         }
1014                         break;
1015                 default:
1016                         break;
1017                 }
1018         }
1019
1020         /* check if the state machine was changed */
1021         if (port->sm_mux_state != last_state) {
1022                 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1023                          port->actor_port_number,
1024                          port->slave->dev->name,
1025                          last_state,
1026                          port->sm_mux_state);
1027                 switch (port->sm_mux_state) {
1028                 case AD_MUX_DETACHED:
1029                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1030                         ad_disable_collecting_distributing(port,
1031                                                            update_slave_arr);
1032                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1033                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1034                         port->ntt = true;
1035                         break;
1036                 case AD_MUX_WAITING:
1037                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1038                         break;
1039                 case AD_MUX_ATTACHED:
1040                         if (port->aggregator->is_active)
1041                                 port->actor_oper_port_state |=
1042                                     AD_STATE_SYNCHRONIZATION;
1043                         else
1044                                 port->actor_oper_port_state &=
1045                                     ~AD_STATE_SYNCHRONIZATION;
1046                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1047                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1048                         ad_disable_collecting_distributing(port,
1049                                                            update_slave_arr);
1050                         port->ntt = true;
1051                         break;
1052                 case AD_MUX_COLLECTING_DISTRIBUTING:
1053                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1054                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1055                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1056                         ad_enable_collecting_distributing(port,
1057                                                           update_slave_arr);
1058                         port->ntt = true;
1059                         break;
1060                 default:
1061                         break;
1062                 }
1063         }
1064 }
1065
1066 /**
1067  * ad_rx_machine - handle a port's rx State Machine
1068  * @lacpdu: the lacpdu we've received
1069  * @port: the port we're looking at
1070  *
1071  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1072  * CURRENT. If timer expired set the state machine in the proper state.
1073  * In other cases, this function checks if we need to switch to other state.
1074  */
1075 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1076 {
1077         rx_states_t last_state;
1078
1079         /* keep current State Machine state to compare later if it was
1080          * changed
1081          */
1082         last_state = port->sm_rx_state;
1083
1084         /* check if state machine should change state */
1085
1086         /* first, check if port was reinitialized */
1087         if (port->sm_vars & AD_PORT_BEGIN) {
1088                 port->sm_rx_state = AD_RX_INITIALIZE;
1089                 port->sm_vars |= AD_PORT_CHURNED;
1090         /* check if port is not enabled */
1091         } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1092                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1093         /* check if new lacpdu arrived */
1094         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1095                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1096                  (port->sm_rx_state == AD_RX_CURRENT))) {
1097                 if (port->sm_rx_state != AD_RX_CURRENT)
1098                         port->sm_vars |= AD_PORT_CHURNED;
1099                 port->sm_rx_timer_counter = 0;
1100                 port->sm_rx_state = AD_RX_CURRENT;
1101         } else {
1102                 /* if timer is on, and if it is expired */
1103                 if (port->sm_rx_timer_counter &&
1104                     !(--port->sm_rx_timer_counter)) {
1105                         switch (port->sm_rx_state) {
1106                         case AD_RX_EXPIRED:
1107                                 port->sm_rx_state = AD_RX_DEFAULTED;
1108                                 break;
1109                         case AD_RX_CURRENT:
1110                                 port->sm_rx_state = AD_RX_EXPIRED;
1111                                 break;
1112                         default:
1113                                 break;
1114                         }
1115                 } else {
1116                         /* if no lacpdu arrived and no timer is on */
1117                         switch (port->sm_rx_state) {
1118                         case AD_RX_PORT_DISABLED:
1119                                 if (port->is_enabled &&
1120                                     (port->sm_vars & AD_PORT_LACP_ENABLED))
1121                                         port->sm_rx_state = AD_RX_EXPIRED;
1122                                 else if (port->is_enabled
1123                                          && ((port->sm_vars
1124                                               & AD_PORT_LACP_ENABLED) == 0))
1125                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1126                                 break;
1127                         default:
1128                                 break;
1129
1130                         }
1131                 }
1132         }
1133
1134         /* check if the State machine was changed or new lacpdu arrived */
1135         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1136                 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1137                          port->actor_port_number,
1138                          port->slave->dev->name,
1139                          last_state,
1140                          port->sm_rx_state);
1141                 switch (port->sm_rx_state) {
1142                 case AD_RX_INITIALIZE:
1143                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1144                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1145                         else
1146                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1147                         port->sm_vars &= ~AD_PORT_SELECTED;
1148                         __record_default(port);
1149                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1150                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1151
1152                         /* Fall Through */
1153                 case AD_RX_PORT_DISABLED:
1154                         port->sm_vars &= ~AD_PORT_MATCHED;
1155                         break;
1156                 case AD_RX_LACP_DISABLED:
1157                         port->sm_vars &= ~AD_PORT_SELECTED;
1158                         __record_default(port);
1159                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1160                         port->sm_vars |= AD_PORT_MATCHED;
1161                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1162                         break;
1163                 case AD_RX_EXPIRED:
1164                         /* Reset of the Synchronization flag (Standard 43.4.12)
1165                          * This reset cause to disable this port in the
1166                          * COLLECTING_DISTRIBUTING state of the mux machine in
1167                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1168                          * the port.
1169                          */
1170                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1171                         port->sm_vars &= ~AD_PORT_MATCHED;
1172                         port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1173                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1174                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1175                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1176                         port->sm_vars |= AD_PORT_CHURNED;
1177                         break;
1178                 case AD_RX_DEFAULTED:
1179                         __update_default_selected(port);
1180                         __record_default(port);
1181                         port->sm_vars |= AD_PORT_MATCHED;
1182                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1183                         break;
1184                 case AD_RX_CURRENT:
1185                         /* detect loopback situation */
1186                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1187                                               &(port->actor_system))) {
1188                                 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1189                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1190                                        port->slave->dev->name);
1191                                 return;
1192                         }
1193                         __update_selected(lacpdu, port);
1194                         __update_ntt(lacpdu, port);
1195                         __record_pdu(lacpdu, port);
1196                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1197                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1198                         break;
1199                 default:
1200                         break;
1201                 }
1202         }
1203 }
1204
1205 /**
1206  * ad_churn_machine - handle port churn's state machine
1207  * @port: the port we're looking at
1208  *
1209  */
1210 static void ad_churn_machine(struct port *port)
1211 {
1212         if (port->sm_vars & AD_PORT_CHURNED) {
1213                 port->sm_vars &= ~AD_PORT_CHURNED;
1214                 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1215                 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1216                 port->sm_churn_actor_timer_counter =
1217                         __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1218                  port->sm_churn_partner_timer_counter =
1219                          __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1220                 return;
1221         }
1222         if (port->sm_churn_actor_timer_counter &&
1223             !(--port->sm_churn_actor_timer_counter) &&
1224             port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1225                 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1226                         port->sm_churn_actor_state = AD_NO_CHURN;
1227                 } else {
1228                         port->churn_actor_count++;
1229                         port->sm_churn_actor_state = AD_CHURN;
1230                 }
1231         }
1232         if (port->sm_churn_partner_timer_counter &&
1233             !(--port->sm_churn_partner_timer_counter) &&
1234             port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1235                 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1236                         port->sm_churn_partner_state = AD_NO_CHURN;
1237                 } else {
1238                         port->churn_partner_count++;
1239                         port->sm_churn_partner_state = AD_CHURN;
1240                 }
1241         }
1242 }
1243
1244 /**
1245  * ad_tx_machine - handle a port's tx state machine
1246  * @port: the port we're looking at
1247  */
1248 static void ad_tx_machine(struct port *port)
1249 {
1250         /* check if tx timer expired, to verify that we do not send more than
1251          * 3 packets per second
1252          */
1253         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1254                 /* check if there is something to send */
1255                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1256                         __update_lacpdu_from_port(port);
1257
1258                         if (ad_lacpdu_send(port) >= 0) {
1259                                 pr_debug("Sent LACPDU on port %d\n",
1260                                          port->actor_port_number);
1261
1262                                 /* mark ntt as false, so it will not be sent
1263                                  * again until demanded
1264                                  */
1265                                 port->ntt = false;
1266                         }
1267                 }
1268                 /* restart tx timer(to verify that we will not exceed
1269                  * AD_MAX_TX_IN_SECOND
1270                  */
1271                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1272         }
1273 }
1274
1275 /**
1276  * ad_periodic_machine - handle a port's periodic state machine
1277  * @port: the port we're looking at
1278  *
1279  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1280  */
1281 static void ad_periodic_machine(struct port *port)
1282 {
1283         periodic_states_t last_state;
1284
1285         /* keep current state machine state to compare later if it was changed */
1286         last_state = port->sm_periodic_state;
1287
1288         /* check if port was reinitialized */
1289         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1290             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1291            ) {
1292                 port->sm_periodic_state = AD_NO_PERIODIC;
1293         }
1294         /* check if state machine should change state */
1295         else if (port->sm_periodic_timer_counter) {
1296                 /* check if periodic state machine expired */
1297                 if (!(--port->sm_periodic_timer_counter)) {
1298                         /* if expired then do tx */
1299                         port->sm_periodic_state = AD_PERIODIC_TX;
1300                 } else {
1301                         /* If not expired, check if there is some new timeout
1302                          * parameter from the partner state
1303                          */
1304                         switch (port->sm_periodic_state) {
1305                         case AD_FAST_PERIODIC:
1306                                 if (!(port->partner_oper.port_state
1307                                       & AD_STATE_LACP_TIMEOUT))
1308                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1309                                 break;
1310                         case AD_SLOW_PERIODIC:
1311                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1312                                         port->sm_periodic_timer_counter = 0;
1313                                         port->sm_periodic_state = AD_PERIODIC_TX;
1314                                 }
1315                                 break;
1316                         default:
1317                                 break;
1318                         }
1319                 }
1320         } else {
1321                 switch (port->sm_periodic_state) {
1322                 case AD_NO_PERIODIC:
1323                         port->sm_periodic_state = AD_FAST_PERIODIC;
1324                         break;
1325                 case AD_PERIODIC_TX:
1326                         if (!(port->partner_oper.port_state &
1327                             AD_STATE_LACP_TIMEOUT))
1328                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1329                         else
1330                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1331                         break;
1332                 default:
1333                         break;
1334                 }
1335         }
1336
1337         /* check if the state machine was changed */
1338         if (port->sm_periodic_state != last_state) {
1339                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1340                          port->actor_port_number, last_state,
1341                          port->sm_periodic_state);
1342                 switch (port->sm_periodic_state) {
1343                 case AD_NO_PERIODIC:
1344                         port->sm_periodic_timer_counter = 0;
1345                         break;
1346                 case AD_FAST_PERIODIC:
1347                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1348                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1349                         break;
1350                 case AD_SLOW_PERIODIC:
1351                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1352                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1353                         break;
1354                 case AD_PERIODIC_TX:
1355                         port->ntt = true;
1356                         break;
1357                 default:
1358                         break;
1359                 }
1360         }
1361 }
1362
1363 /**
1364  * ad_port_selection_logic - select aggregation groups
1365  * @port: the port we're looking at
1366  * @update_slave_arr: Does slave array need update?
1367  *
1368  * Select aggregation groups, and assign each port for it's aggregetor. The
1369  * selection logic is called in the inititalization (after all the handshkes),
1370  * and after every lacpdu receive (if selected is off).
1371  */
1372 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1373 {
1374         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1375         struct port *last_port = NULL, *curr_port;
1376         struct list_head *iter;
1377         struct bonding *bond;
1378         struct slave *slave;
1379         int found = 0;
1380
1381         /* if the port is already Selected, do nothing */
1382         if (port->sm_vars & AD_PORT_SELECTED)
1383                 return;
1384
1385         bond = __get_bond_by_port(port);
1386
1387         /* if the port is connected to other aggregator, detach it */
1388         if (port->aggregator) {
1389                 /* detach the port from its former aggregator */
1390                 temp_aggregator = port->aggregator;
1391                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1392                      last_port = curr_port,
1393                      curr_port = curr_port->next_port_in_aggregator) {
1394                         if (curr_port == port) {
1395                                 temp_aggregator->num_of_ports--;
1396                                 /* if it is the first port attached to the
1397                                  * aggregator
1398                                  */
1399                                 if (!last_port) {
1400                                         temp_aggregator->lag_ports =
1401                                                 port->next_port_in_aggregator;
1402                                 } else {
1403                                         /* not the first port attached to the
1404                                          * aggregator
1405                                          */
1406                                         last_port->next_port_in_aggregator =
1407                                                 port->next_port_in_aggregator;
1408                                 }
1409
1410                                 /* clear the port's relations to this
1411                                  * aggregator
1412                                  */
1413                                 port->aggregator = NULL;
1414                                 port->next_port_in_aggregator = NULL;
1415                                 port->actor_port_aggregator_identifier = 0;
1416
1417                                 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1418                                            port->actor_port_number,
1419                                            temp_aggregator->aggregator_identifier);
1420                                 /* if the aggregator is empty, clear its
1421                                  * parameters, and set it ready to be attached
1422                                  */
1423                                 if (!temp_aggregator->lag_ports)
1424                                         ad_clear_agg(temp_aggregator);
1425                                 break;
1426                         }
1427                 }
1428                 if (!curr_port) {
1429                         /* meaning: the port was related to an aggregator
1430                          * but was not on the aggregator port list
1431                          */
1432                         net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1433                                              port->slave->bond->dev->name,
1434                                              port->actor_port_number,
1435                                              port->slave->dev->name,
1436                                              port->aggregator->aggregator_identifier);
1437                 }
1438         }
1439         /* search on all aggregators for a suitable aggregator for this port */
1440         bond_for_each_slave(bond, slave, iter) {
1441                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1442
1443                 /* keep a free aggregator for later use(if needed) */
1444                 if (!aggregator->lag_ports) {
1445                         if (!free_aggregator)
1446                                 free_aggregator = aggregator;
1447                         continue;
1448                 }
1449                 /* check if current aggregator suits us */
1450                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1451                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1452                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1453                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1454                     ) &&
1455                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1456                       !aggregator->is_individual)  /* but is not individual OR */
1457                     )
1458                    ) {
1459                         /* attach to the founded aggregator */
1460                         port->aggregator = aggregator;
1461                         port->actor_port_aggregator_identifier =
1462                                 port->aggregator->aggregator_identifier;
1463                         port->next_port_in_aggregator = aggregator->lag_ports;
1464                         port->aggregator->num_of_ports++;
1465                         aggregator->lag_ports = port;
1466                         netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1467                                    port->actor_port_number,
1468                                    port->aggregator->aggregator_identifier);
1469
1470                         /* mark this port as selected */
1471                         port->sm_vars |= AD_PORT_SELECTED;
1472                         found = 1;
1473                         break;
1474                 }
1475         }
1476
1477         /* the port couldn't find an aggregator - attach it to a new
1478          * aggregator
1479          */
1480         if (!found) {
1481                 if (free_aggregator) {
1482                         /* assign port a new aggregator */
1483                         port->aggregator = free_aggregator;
1484                         port->actor_port_aggregator_identifier =
1485                                 port->aggregator->aggregator_identifier;
1486
1487                         /* update the new aggregator's parameters
1488                          * if port was responsed from the end-user
1489                          */
1490                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1491                                 /* if port is full duplex */
1492                                 port->aggregator->is_individual = false;
1493                         else
1494                                 port->aggregator->is_individual = true;
1495
1496                         port->aggregator->actor_admin_aggregator_key =
1497                                 port->actor_admin_port_key;
1498                         port->aggregator->actor_oper_aggregator_key =
1499                                 port->actor_oper_port_key;
1500                         port->aggregator->partner_system =
1501                                 port->partner_oper.system;
1502                         port->aggregator->partner_system_priority =
1503                                 port->partner_oper.system_priority;
1504                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1505                         port->aggregator->receive_state = 1;
1506                         port->aggregator->transmit_state = 1;
1507                         port->aggregator->lag_ports = port;
1508                         port->aggregator->num_of_ports++;
1509
1510                         /* mark this port as selected */
1511                         port->sm_vars |= AD_PORT_SELECTED;
1512
1513                         netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1514                                    port->actor_port_number,
1515                                    port->aggregator->aggregator_identifier);
1516                 } else {
1517                         netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1518                                port->actor_port_number, port->slave->dev->name);
1519                 }
1520         }
1521         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1522          * in all aggregator's ports, else set ready=FALSE in all
1523          * aggregator's ports
1524          */
1525         __set_agg_ports_ready(port->aggregator,
1526                               __agg_ports_are_ready(port->aggregator));
1527
1528         aggregator = __get_first_agg(port);
1529         ad_agg_selection_logic(aggregator, update_slave_arr);
1530
1531         if (!port->aggregator->is_active)
1532                 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1533 }
1534
1535 /* Decide if "agg" is a better choice for the new active aggregator that
1536  * the current best, according to the ad_select policy.
1537  */
1538 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1539                                                 struct aggregator *curr)
1540 {
1541         /* 0. If no best, select current.
1542          *
1543          * 1. If the current agg is not individual, and the best is
1544          *    individual, select current.
1545          *
1546          * 2. If current agg is individual and the best is not, keep best.
1547          *
1548          * 3. Therefore, current and best are both individual or both not
1549          *    individual, so:
1550          *
1551          * 3a. If current agg partner replied, and best agg partner did not,
1552          *     select current.
1553          *
1554          * 3b. If current agg partner did not reply and best agg partner
1555          *     did reply, keep best.
1556          *
1557          * 4.  Therefore, current and best both have partner replies or
1558          *     both do not, so perform selection policy:
1559          *
1560          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1561          *     select by bandwidth.
1562          *
1563          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1564          */
1565         if (!best)
1566                 return curr;
1567
1568         if (!curr->is_individual && best->is_individual)
1569                 return curr;
1570
1571         if (curr->is_individual && !best->is_individual)
1572                 return best;
1573
1574         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1575                 return curr;
1576
1577         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1578                 return best;
1579
1580         switch (__get_agg_selection_mode(curr->lag_ports)) {
1581         case BOND_AD_COUNT:
1582                 if (__agg_active_ports(curr) > __agg_active_ports(best))
1583                         return curr;
1584
1585                 if (__agg_active_ports(curr) < __agg_active_ports(best))
1586                         return best;
1587
1588                 /*FALLTHROUGH*/
1589         case BOND_AD_STABLE:
1590         case BOND_AD_BANDWIDTH:
1591                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1592                         return curr;
1593
1594                 break;
1595
1596         default:
1597                 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1598                                      curr->slave->bond->dev->name,
1599                                      __get_agg_selection_mode(curr->lag_ports));
1600                 break;
1601         }
1602
1603         return best;
1604 }
1605
1606 static int agg_device_up(const struct aggregator *agg)
1607 {
1608         struct port *port = agg->lag_ports;
1609
1610         if (!port)
1611                 return 0;
1612
1613         for (port = agg->lag_ports; port;
1614              port = port->next_port_in_aggregator) {
1615                 if (netif_running(port->slave->dev) &&
1616                     netif_carrier_ok(port->slave->dev))
1617                         return 1;
1618         }
1619
1620         return 0;
1621 }
1622
1623 /**
1624  * ad_agg_selection_logic - select an aggregation group for a team
1625  * @aggregator: the aggregator we're looking at
1626  * @update_slave_arr: Does slave array need update?
1627  *
1628  * It is assumed that only one aggregator may be selected for a team.
1629  *
1630  * The logic of this function is to select the aggregator according to
1631  * the ad_select policy:
1632  *
1633  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1634  * it, and to reselect the active aggregator only if the previous
1635  * aggregator has no more ports related to it.
1636  *
1637  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1638  * bandwidth, and reselect whenever a link state change takes place or the
1639  * set of slaves in the bond changes.
1640  *
1641  * BOND_AD_COUNT: select the aggregator with largest number of ports
1642  * (slaves), and reselect whenever a link state change takes place or the
1643  * set of slaves in the bond changes.
1644  *
1645  * FIXME: this function MUST be called with the first agg in the bond, or
1646  * __get_active_agg() won't work correctly. This function should be better
1647  * called with the bond itself, and retrieve the first agg from it.
1648  */
1649 static void ad_agg_selection_logic(struct aggregator *agg,
1650                                    bool *update_slave_arr)
1651 {
1652         struct aggregator *best, *active, *origin;
1653         struct bonding *bond = agg->slave->bond;
1654         struct list_head *iter;
1655         struct slave *slave;
1656         struct port *port;
1657
1658         rcu_read_lock();
1659         origin = agg;
1660         active = __get_active_agg(agg);
1661         best = (active && agg_device_up(active)) ? active : NULL;
1662
1663         bond_for_each_slave_rcu(bond, slave, iter) {
1664                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1665
1666                 agg->is_active = 0;
1667
1668                 if (__agg_active_ports(agg) && agg_device_up(agg))
1669                         best = ad_agg_selection_test(best, agg);
1670         }
1671
1672         if (best &&
1673             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1674                 /* For the STABLE policy, don't replace the old active
1675                  * aggregator if it's still active (it has an answering
1676                  * partner) or if both the best and active don't have an
1677                  * answering partner.
1678                  */
1679                 if (active && active->lag_ports &&
1680                     __agg_active_ports(active) &&
1681                     (__agg_has_partner(active) ||
1682                      (!__agg_has_partner(active) &&
1683                      !__agg_has_partner(best)))) {
1684                         if (!(!active->actor_oper_aggregator_key &&
1685                               best->actor_oper_aggregator_key)) {
1686                                 best = NULL;
1687                                 active->is_active = 1;
1688                         }
1689                 }
1690         }
1691
1692         if (best && (best == active)) {
1693                 best = NULL;
1694                 active->is_active = 1;
1695         }
1696
1697         /* if there is new best aggregator, activate it */
1698         if (best) {
1699                 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1700                            best->aggregator_identifier, best->num_of_ports,
1701                            best->actor_oper_aggregator_key,
1702                            best->partner_oper_aggregator_key,
1703                            best->is_individual, best->is_active);
1704                 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1705                            best->lag_ports, best->slave,
1706                            best->slave ? best->slave->dev->name : "NULL");
1707
1708                 bond_for_each_slave_rcu(bond, slave, iter) {
1709                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1710
1711                         netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1712                                    agg->aggregator_identifier, agg->num_of_ports,
1713                                    agg->actor_oper_aggregator_key,
1714                                    agg->partner_oper_aggregator_key,
1715                                    agg->is_individual, agg->is_active);
1716                 }
1717
1718                 /* check if any partner replys */
1719                 if (best->is_individual) {
1720                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1721                                              best->slave ?
1722                                              best->slave->bond->dev->name : "NULL");
1723                 }
1724
1725                 best->is_active = 1;
1726                 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1727                            best->aggregator_identifier);
1728                 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1729                            best->aggregator_identifier, best->num_of_ports,
1730                            best->actor_oper_aggregator_key,
1731                            best->partner_oper_aggregator_key,
1732                            best->is_individual, best->is_active);
1733
1734                 /* disable the ports that were related to the former
1735                  * active_aggregator
1736                  */
1737                 if (active) {
1738                         for (port = active->lag_ports; port;
1739                              port = port->next_port_in_aggregator) {
1740                                 __disable_port(port);
1741                         }
1742                 }
1743                 /* Slave array needs update. */
1744                 *update_slave_arr = true;
1745         }
1746
1747         /* if the selected aggregator is of join individuals
1748          * (partner_system is NULL), enable their ports
1749          */
1750         active = __get_active_agg(origin);
1751
1752         if (active) {
1753                 if (!__agg_has_partner(active)) {
1754                         for (port = active->lag_ports; port;
1755                              port = port->next_port_in_aggregator) {
1756                                 __enable_port(port);
1757                         }
1758                 }
1759         }
1760
1761         rcu_read_unlock();
1762
1763         bond_3ad_set_carrier(bond);
1764 }
1765
1766 /**
1767  * ad_clear_agg - clear a given aggregator's parameters
1768  * @aggregator: the aggregator we're looking at
1769  */
1770 static void ad_clear_agg(struct aggregator *aggregator)
1771 {
1772         if (aggregator) {
1773                 aggregator->is_individual = false;
1774                 aggregator->actor_admin_aggregator_key = 0;
1775                 aggregator->actor_oper_aggregator_key = 0;
1776                 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1777                 aggregator->partner_system_priority = 0;
1778                 aggregator->partner_oper_aggregator_key = 0;
1779                 aggregator->receive_state = 0;
1780                 aggregator->transmit_state = 0;
1781                 aggregator->lag_ports = NULL;
1782                 aggregator->is_active = 0;
1783                 aggregator->num_of_ports = 0;
1784                 pr_debug("LAG %d was cleared\n",
1785                          aggregator->aggregator_identifier);
1786         }
1787 }
1788
1789 /**
1790  * ad_initialize_agg - initialize a given aggregator's parameters
1791  * @aggregator: the aggregator we're looking at
1792  */
1793 static void ad_initialize_agg(struct aggregator *aggregator)
1794 {
1795         if (aggregator) {
1796                 ad_clear_agg(aggregator);
1797
1798                 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1799                 aggregator->aggregator_identifier = 0;
1800                 aggregator->slave = NULL;
1801         }
1802 }
1803
1804 /**
1805  * ad_initialize_port - initialize a given port's parameters
1806  * @aggregator: the aggregator we're looking at
1807  * @lacp_fast: boolean. whether fast periodic should be used
1808  */
1809 static void ad_initialize_port(struct port *port, int lacp_fast)
1810 {
1811         static const struct port_params tmpl = {
1812                 .system_priority = 0xffff,
1813                 .key             = 1,
1814                 .port_number     = 1,
1815                 .port_priority   = 0xff,
1816                 .port_state      = 1,
1817         };
1818         static const struct lacpdu lacpdu = {
1819                 .subtype                = 0x01,
1820                 .version_number = 0x01,
1821                 .tlv_type_actor_info = 0x01,
1822                 .actor_information_length = 0x14,
1823                 .tlv_type_partner_info = 0x02,
1824                 .partner_information_length = 0x14,
1825                 .tlv_type_collector_info = 0x03,
1826                 .collector_information_length = 0x10,
1827                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1828         };
1829
1830         if (port) {
1831                 port->actor_port_priority = 0xff;
1832                 port->actor_port_aggregator_identifier = 0;
1833                 port->ntt = false;
1834                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1835                                                AD_STATE_LACP_ACTIVITY;
1836                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1837                                                AD_STATE_LACP_ACTIVITY;
1838
1839                 if (lacp_fast)
1840                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1841
1842                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1843                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1844
1845                 port->is_enabled = true;
1846                 /* private parameters */
1847                 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1848                 port->sm_rx_state = 0;
1849                 port->sm_rx_timer_counter = 0;
1850                 port->sm_periodic_state = 0;
1851                 port->sm_periodic_timer_counter = 0;
1852                 port->sm_mux_state = 0;
1853                 port->sm_mux_timer_counter = 0;
1854                 port->sm_tx_state = 0;
1855                 port->aggregator = NULL;
1856                 port->next_port_in_aggregator = NULL;
1857                 port->transaction_id = 0;
1858
1859                 port->sm_churn_actor_timer_counter = 0;
1860                 port->sm_churn_actor_state = 0;
1861                 port->churn_actor_count = 0;
1862                 port->sm_churn_partner_timer_counter = 0;
1863                 port->sm_churn_partner_state = 0;
1864                 port->churn_partner_count = 0;
1865
1866                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1867         }
1868 }
1869
1870 /**
1871  * ad_enable_collecting_distributing - enable a port's transmit/receive
1872  * @port: the port we're looking at
1873  * @update_slave_arr: Does slave array need update?
1874  *
1875  * Enable @port if it's in an active aggregator
1876  */
1877 static void ad_enable_collecting_distributing(struct port *port,
1878                                               bool *update_slave_arr)
1879 {
1880         if (port->aggregator->is_active) {
1881                 pr_debug("Enabling port %d(LAG %d)\n",
1882                          port->actor_port_number,
1883                          port->aggregator->aggregator_identifier);
1884                 __enable_port(port);
1885                 /* Slave array needs update */
1886                 *update_slave_arr = true;
1887         }
1888 }
1889
1890 /**
1891  * ad_disable_collecting_distributing - disable a port's transmit/receive
1892  * @port: the port we're looking at
1893  * @update_slave_arr: Does slave array need update?
1894  */
1895 static void ad_disable_collecting_distributing(struct port *port,
1896                                                bool *update_slave_arr)
1897 {
1898         if (port->aggregator &&
1899             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1900                                &(null_mac_addr))) {
1901                 pr_debug("Disabling port %d(LAG %d)\n",
1902                          port->actor_port_number,
1903                          port->aggregator->aggregator_identifier);
1904                 __disable_port(port);
1905                 /* Slave array needs an update */
1906                 *update_slave_arr = true;
1907         }
1908 }
1909
1910 /**
1911  * ad_marker_info_received - handle receive of a Marker information frame
1912  * @marker_info: Marker info received
1913  * @port: the port we're looking at
1914  */
1915 static void ad_marker_info_received(struct bond_marker *marker_info,
1916         struct port *port)
1917 {
1918         struct bond_marker marker;
1919
1920         /* copy the received marker data to the response marker */
1921         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1922         /* change the marker subtype to marker response */
1923         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1924
1925         /* send the marker response */
1926         if (ad_marker_send(port, &marker) >= 0) {
1927                 pr_debug("Sent Marker Response on port %d\n",
1928                          port->actor_port_number);
1929         }
1930 }
1931
1932 /**
1933  * ad_marker_response_received - handle receive of a marker response frame
1934  * @marker: marker PDU received
1935  * @port: the port we're looking at
1936  *
1937  * This function does nothing since we decided not to implement send and handle
1938  * response for marker PDU's, in this stage, but only to respond to marker
1939  * information.
1940  */
1941 static void ad_marker_response_received(struct bond_marker *marker,
1942                                         struct port *port)
1943 {
1944         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1945 }
1946
1947 /* ========= AD exported functions to the main bonding code ========= */
1948
1949 /* Check aggregators status in team every T seconds */
1950 #define AD_AGGREGATOR_SELECTION_TIMER  8
1951
1952 /**
1953  * bond_3ad_initiate_agg_selection - initate aggregator selection
1954  * @bond: bonding struct
1955  *
1956  * Set the aggregation selection timer, to initiate an agg selection in
1957  * the very near future.  Called during first initialization, and during
1958  * any down to up transitions of the bond.
1959  */
1960 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1961 {
1962         BOND_AD_INFO(bond).agg_select_timer = timeout;
1963 }
1964
1965 /**
1966  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1967  * @bond: bonding struct to work on
1968  * @tick_resolution: tick duration (millisecond resolution)
1969  *
1970  * Can be called only after the mac address of the bond is set.
1971  */
1972 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1973 {
1974         /* check that the bond is not initialized yet */
1975         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1976                                 bond->dev->dev_addr)) {
1977
1978                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1979
1980                 BOND_AD_INFO(bond).system.sys_priority =
1981                         bond->params.ad_actor_sys_prio;
1982                 if (is_zero_ether_addr(bond->params.ad_actor_system))
1983                         BOND_AD_INFO(bond).system.sys_mac_addr =
1984                             *((struct mac_addr *)bond->dev->dev_addr);
1985                 else
1986                         BOND_AD_INFO(bond).system.sys_mac_addr =
1987                             *((struct mac_addr *)bond->params.ad_actor_system);
1988
1989                 /* initialize how many times this module is called in one
1990                  * second (should be about every 100ms)
1991                  */
1992                 ad_ticks_per_sec = tick_resolution;
1993
1994                 bond_3ad_initiate_agg_selection(bond,
1995                                                 AD_AGGREGATOR_SELECTION_TIMER *
1996                                                 ad_ticks_per_sec);
1997         }
1998 }
1999
2000 /**
2001  * bond_3ad_bind_slave - initialize a slave's port
2002  * @slave: slave struct to work on
2003  *
2004  * Returns:   0 on success
2005  *          < 0 on error
2006  */
2007 void bond_3ad_bind_slave(struct slave *slave)
2008 {
2009         struct bonding *bond = bond_get_bond_by_slave(slave);
2010         struct port *port;
2011         struct aggregator *aggregator;
2012
2013         /* check that the slave has not been initialized yet. */
2014         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2015
2016                 /* port initialization */
2017                 port = &(SLAVE_AD_INFO(slave)->port);
2018
2019                 ad_initialize_port(port, bond->params.lacp_fast);
2020
2021                 port->slave = slave;
2022                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2023                 /* key is determined according to the link speed, duplex and
2024                  * user key
2025                  */
2026                 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2027                 ad_update_actor_keys(port, false);
2028                 /* actor system is the bond's system */
2029                 __ad_actor_update_port(port);
2030                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2031                  * lacpdu's are sent in one second)
2032                  */
2033                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2034
2035                 __disable_port(port);
2036
2037                 /* aggregator initialization */
2038                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2039
2040                 ad_initialize_agg(aggregator);
2041
2042                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2043                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2044                 aggregator->slave = slave;
2045                 aggregator->is_active = 0;
2046                 aggregator->num_of_ports = 0;
2047         }
2048 }
2049
2050 /**
2051  * bond_3ad_unbind_slave - deinitialize a slave's port
2052  * @slave: slave struct to work on
2053  *
2054  * Search for the aggregator that is related to this port, remove the
2055  * aggregator and assign another aggregator for other port related to it
2056  * (if any), and remove the port.
2057  */
2058 void bond_3ad_unbind_slave(struct slave *slave)
2059 {
2060         struct port *port, *prev_port, *temp_port;
2061         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2062         int select_new_active_agg = 0;
2063         struct bonding *bond = slave->bond;
2064         struct slave *slave_iter;
2065         struct list_head *iter;
2066         bool dummy_slave_update; /* Ignore this value as caller updates array */
2067
2068         /* Sync against bond_3ad_state_machine_handler() */
2069         spin_lock_bh(&bond->mode_lock);
2070         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2071         port = &(SLAVE_AD_INFO(slave)->port);
2072
2073         /* if slave is null, the whole port is not initialized */
2074         if (!port->slave) {
2075                 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
2076                             slave->dev->name);
2077                 goto out;
2078         }
2079
2080         netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
2081                    aggregator->aggregator_identifier);
2082
2083         /* Tell the partner that this port is not suitable for aggregation */
2084         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2085         __update_lacpdu_from_port(port);
2086         ad_lacpdu_send(port);
2087
2088         /* check if this aggregator is occupied */
2089         if (aggregator->lag_ports) {
2090                 /* check if there are other ports related to this aggregator
2091                  * except the port related to this slave(thats ensure us that
2092                  * there is a reason to search for new aggregator, and that we
2093                  * will find one
2094                  */
2095                 if ((aggregator->lag_ports != port) ||
2096                     (aggregator->lag_ports->next_port_in_aggregator)) {
2097                         /* find new aggregator for the related port(s) */
2098                         bond_for_each_slave(bond, slave_iter, iter) {
2099                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2100                                 /* if the new aggregator is empty, or it is
2101                                  * connected to our port only
2102                                  */
2103                                 if (!new_aggregator->lag_ports ||
2104                                     ((new_aggregator->lag_ports == port) &&
2105                                      !new_aggregator->lag_ports->next_port_in_aggregator))
2106                                         break;
2107                         }
2108                         if (!slave_iter)
2109                                 new_aggregator = NULL;
2110
2111                         /* if new aggregator found, copy the aggregator's
2112                          * parameters and connect the related lag_ports to the
2113                          * new aggregator
2114                          */
2115                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2116                                 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2117                                            aggregator->aggregator_identifier,
2118                                            new_aggregator->aggregator_identifier);
2119
2120                                 if ((new_aggregator->lag_ports == port) &&
2121                                     new_aggregator->is_active) {
2122                                         netdev_info(bond->dev, "Removing an active aggregator\n");
2123                                          select_new_active_agg = 1;
2124                                 }
2125
2126                                 new_aggregator->is_individual = aggregator->is_individual;
2127                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2128                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2129                                 new_aggregator->partner_system = aggregator->partner_system;
2130                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2131                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2132                                 new_aggregator->receive_state = aggregator->receive_state;
2133                                 new_aggregator->transmit_state = aggregator->transmit_state;
2134                                 new_aggregator->lag_ports = aggregator->lag_ports;
2135                                 new_aggregator->is_active = aggregator->is_active;
2136                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2137
2138                                 /* update the information that is written on
2139                                  * the ports about the aggregator
2140                                  */
2141                                 for (temp_port = aggregator->lag_ports; temp_port;
2142                                      temp_port = temp_port->next_port_in_aggregator) {
2143                                         temp_port->aggregator = new_aggregator;
2144                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2145                                 }
2146
2147                                 ad_clear_agg(aggregator);
2148
2149                                 if (select_new_active_agg)
2150                                         ad_agg_selection_logic(__get_first_agg(port),
2151                                                                &dummy_slave_update);
2152                         } else {
2153                                 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2154                         }
2155                 } else {
2156                         /* in case that the only port related to this
2157                          * aggregator is the one we want to remove
2158                          */
2159                         select_new_active_agg = aggregator->is_active;
2160                         ad_clear_agg(aggregator);
2161                         if (select_new_active_agg) {
2162                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2163                                 /* select new active aggregator */
2164                                 temp_aggregator = __get_first_agg(port);
2165                                 if (temp_aggregator)
2166                                         ad_agg_selection_logic(temp_aggregator,
2167                                                                &dummy_slave_update);
2168                         }
2169                 }
2170         }
2171
2172         netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
2173
2174         /* find the aggregator that this port is connected to */
2175         bond_for_each_slave(bond, slave_iter, iter) {
2176                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2177                 prev_port = NULL;
2178                 /* search the port in the aggregator's related ports */
2179                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2180                      prev_port = temp_port,
2181                      temp_port = temp_port->next_port_in_aggregator) {
2182                         if (temp_port == port) {
2183                                 /* the aggregator found - detach the port from
2184                                  * this aggregator
2185                                  */
2186                                 if (prev_port)
2187                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2188                                 else
2189                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2190                                 temp_aggregator->num_of_ports--;
2191                                 if (__agg_active_ports(temp_aggregator) == 0) {
2192                                         select_new_active_agg = temp_aggregator->is_active;
2193                                         ad_clear_agg(temp_aggregator);
2194                                         if (select_new_active_agg) {
2195                                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2196                                                 /* select new active aggregator */
2197                                                 ad_agg_selection_logic(__get_first_agg(port),
2198                                                                        &dummy_slave_update);
2199                                         }
2200                                 }
2201                                 break;
2202                         }
2203                 }
2204         }
2205         port->slave = NULL;
2206
2207 out:
2208         spin_unlock_bh(&bond->mode_lock);
2209 }
2210
2211 /**
2212  * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2213  * @bond: bonding struct to work on
2214  *
2215  * If an ad_actor setting gets changed we need to update the individual port
2216  * settings so the bond device will use the new values when it gets upped.
2217  */
2218 void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2219 {
2220         struct list_head *iter;
2221         struct slave *slave;
2222
2223         ASSERT_RTNL();
2224
2225         BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2226         if (is_zero_ether_addr(bond->params.ad_actor_system))
2227                 BOND_AD_INFO(bond).system.sys_mac_addr =
2228                     *((struct mac_addr *)bond->dev->dev_addr);
2229         else
2230                 BOND_AD_INFO(bond).system.sys_mac_addr =
2231                     *((struct mac_addr *)bond->params.ad_actor_system);
2232
2233         spin_lock_bh(&bond->mode_lock);
2234         bond_for_each_slave(bond, slave, iter) {
2235                 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2236
2237                 __ad_actor_update_port(port);
2238                 port->ntt = true;
2239         }
2240         spin_unlock_bh(&bond->mode_lock);
2241 }
2242
2243 /**
2244  * bond_3ad_state_machine_handler - handle state machines timeout
2245  * @bond: bonding struct to work on
2246  *
2247  * The state machine handling concept in this module is to check every tick
2248  * which state machine should operate any function. The execution order is
2249  * round robin, so when we have an interaction between state machines, the
2250  * reply of one to each other might be delayed until next tick.
2251  *
2252  * This function also complete the initialization when the agg_select_timer
2253  * times out, and it selects an aggregator for the ports that are yet not
2254  * related to any aggregator, and selects the active aggregator for a bond.
2255  */
2256 void bond_3ad_state_machine_handler(struct work_struct *work)
2257 {
2258         struct bonding *bond = container_of(work, struct bonding,
2259                                             ad_work.work);
2260         struct aggregator *aggregator;
2261         struct list_head *iter;
2262         struct slave *slave;
2263         struct port *port;
2264         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2265         bool update_slave_arr = false;
2266
2267         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2268          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2269          * concurrently due to incoming LACPDU as well.
2270          */
2271         spin_lock_bh(&bond->mode_lock);
2272         rcu_read_lock();
2273
2274         /* check if there are any slaves */
2275         if (!bond_has_slaves(bond))
2276                 goto re_arm;
2277
2278         /* check if agg_select_timer timer after initialize is timed out */
2279         if (BOND_AD_INFO(bond).agg_select_timer &&
2280             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2281                 slave = bond_first_slave_rcu(bond);
2282                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2283
2284                 /* select the active aggregator for the bond */
2285                 if (port) {
2286                         if (!port->slave) {
2287                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2288                                                      bond->dev->name);
2289                                 goto re_arm;
2290                         }
2291
2292                         aggregator = __get_first_agg(port);
2293                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2294                 }
2295                 bond_3ad_set_carrier(bond);
2296         }
2297
2298         /* for each port run the state machines */
2299         bond_for_each_slave_rcu(bond, slave, iter) {
2300                 port = &(SLAVE_AD_INFO(slave)->port);
2301                 if (!port->slave) {
2302                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2303                                             bond->dev->name);
2304                         goto re_arm;
2305                 }
2306
2307                 ad_rx_machine(NULL, port);
2308                 ad_periodic_machine(port);
2309                 ad_port_selection_logic(port, &update_slave_arr);
2310                 ad_mux_machine(port, &update_slave_arr);
2311                 ad_tx_machine(port);
2312                 ad_churn_machine(port);
2313
2314                 /* turn off the BEGIN bit, since we already handled it */
2315                 if (port->sm_vars & AD_PORT_BEGIN)
2316                         port->sm_vars &= ~AD_PORT_BEGIN;
2317         }
2318
2319 re_arm:
2320         bond_for_each_slave_rcu(bond, slave, iter) {
2321                 if (slave->should_notify) {
2322                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2323                         break;
2324                 }
2325         }
2326         rcu_read_unlock();
2327         spin_unlock_bh(&bond->mode_lock);
2328
2329         if (update_slave_arr)
2330                 bond_slave_arr_work_rearm(bond, 0);
2331
2332         if (should_notify_rtnl && rtnl_trylock()) {
2333                 bond_slave_state_notify(bond);
2334                 rtnl_unlock();
2335         }
2336         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2337 }
2338
2339 /**
2340  * bond_3ad_rx_indication - handle a received frame
2341  * @lacpdu: received lacpdu
2342  * @slave: slave struct to work on
2343  * @length: length of the data received
2344  *
2345  * It is assumed that frames that were sent on this NIC don't returned as new
2346  * received frames (loopback). Since only the payload is given to this
2347  * function, it check for loopback.
2348  */
2349 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2350                                   u16 length)
2351 {
2352         struct port *port;
2353         int ret = RX_HANDLER_ANOTHER;
2354
2355         if (length >= sizeof(struct lacpdu)) {
2356
2357                 port = &(SLAVE_AD_INFO(slave)->port);
2358
2359                 if (!port->slave) {
2360                         net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2361                                              slave->dev->name, slave->bond->dev->name);
2362                         return ret;
2363                 }
2364
2365                 switch (lacpdu->subtype) {
2366                 case AD_TYPE_LACPDU:
2367                         ret = RX_HANDLER_CONSUMED;
2368                         netdev_dbg(slave->bond->dev,
2369                                    "Received LACPDU on port %d slave %s\n",
2370                                    port->actor_port_number,
2371                                    slave->dev->name);
2372                         /* Protect against concurrent state machines */
2373                         spin_lock(&slave->bond->mode_lock);
2374                         ad_rx_machine(lacpdu, port);
2375                         spin_unlock(&slave->bond->mode_lock);
2376                         break;
2377
2378                 case AD_TYPE_MARKER:
2379                         ret = RX_HANDLER_CONSUMED;
2380                         /* No need to convert fields to Little Endian since we
2381                          * don't use the marker's fields.
2382                          */
2383
2384                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2385                         case AD_MARKER_INFORMATION_SUBTYPE:
2386                                 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2387                                            port->actor_port_number);
2388                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2389                                 break;
2390
2391                         case AD_MARKER_RESPONSE_SUBTYPE:
2392                                 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2393                                            port->actor_port_number);
2394                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2395                                 break;
2396
2397                         default:
2398                                 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2399                                            port->actor_port_number);
2400                         }
2401                 }
2402         }
2403         return ret;
2404 }
2405
2406 /**
2407  * ad_update_actor_keys - Update the oper / admin keys for a port based on
2408  * its current speed and duplex settings.
2409  *
2410  * @port: the port we'are looking at
2411  * @reset: Boolean to just reset the speed and the duplex part of the key
2412  *
2413  * The logic to change the oper / admin keys is:
2414  * (a) A full duplex port can participate in LACP with partner.
2415  * (b) When the speed is changed, LACP need to be reinitiated.
2416  */
2417 static void ad_update_actor_keys(struct port *port, bool reset)
2418 {
2419         u8 duplex = 0;
2420         u16 ospeed = 0, speed = 0;
2421         u16 old_oper_key = port->actor_oper_port_key;
2422
2423         port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2424         if (!reset) {
2425                 speed = __get_link_speed(port);
2426                 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2427                 duplex = __get_duplex(port);
2428                 port->actor_admin_port_key |= (speed << 1) | duplex;
2429         }
2430         port->actor_oper_port_key = port->actor_admin_port_key;
2431
2432         if (old_oper_key != port->actor_oper_port_key) {
2433                 /* Only 'duplex' port participates in LACP */
2434                 if (duplex)
2435                         port->sm_vars |= AD_PORT_LACP_ENABLED;
2436                 else
2437                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2438
2439                 if (!reset) {
2440                         if (!speed) {
2441                                 netdev_err(port->slave->dev,
2442                                            "speed changed to 0 for port %s",
2443                                            port->slave->dev->name);
2444                         } else if (duplex && ospeed != speed) {
2445                                 /* Speed change restarts LACP state-machine */
2446                                 port->sm_vars |= AD_PORT_BEGIN;
2447                         }
2448                 }
2449         }
2450 }
2451
2452 /**
2453  * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2454  * change indication
2455  *
2456  * @slave: slave struct to work on
2457  *
2458  * Handle reselection of aggregator (if needed) for this port.
2459  */
2460 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2461 {
2462         struct port *port;
2463
2464         port = &(SLAVE_AD_INFO(slave)->port);
2465
2466         /* if slave is null, the whole port is not initialized */
2467         if (!port->slave) {
2468                 netdev_warn(slave->bond->dev,
2469                             "speed/duplex changed for uninitialized port %s\n",
2470                             slave->dev->name);
2471                 return;
2472         }
2473
2474         spin_lock_bh(&slave->bond->mode_lock);
2475         ad_update_actor_keys(port, false);
2476         spin_unlock_bh(&slave->bond->mode_lock);
2477         netdev_dbg(slave->bond->dev, "Port %d slave %s changed speed/duplex\n",
2478                    port->actor_port_number, slave->dev->name);
2479 }
2480
2481 /**
2482  * bond_3ad_handle_link_change - handle a slave's link status change indication
2483  * @slave: slave struct to work on
2484  * @status: whether the link is now up or down
2485  *
2486  * Handle reselection of aggregator (if needed) for this port.
2487  */
2488 void bond_3ad_handle_link_change(struct slave *slave, char link)
2489 {
2490         struct aggregator *agg;
2491         struct port *port;
2492         bool dummy;
2493
2494         port = &(SLAVE_AD_INFO(slave)->port);
2495
2496         /* if slave is null, the whole port is not initialized */
2497         if (!port->slave) {
2498                 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2499                             slave->dev->name);
2500                 return;
2501         }
2502
2503         spin_lock_bh(&slave->bond->mode_lock);
2504         /* on link down we are zeroing duplex and speed since
2505          * some of the adaptors(ce1000.lan) report full duplex/speed
2506          * instead of N/A(duplex) / 0(speed).
2507          *
2508          * on link up we are forcing recheck on the duplex and speed since
2509          * some of he adaptors(ce1000.lan) report.
2510          */
2511         if (link == BOND_LINK_UP) {
2512                 port->is_enabled = true;
2513                 ad_update_actor_keys(port, false);
2514         } else {
2515                 /* link has failed */
2516                 port->is_enabled = false;
2517                 ad_update_actor_keys(port, true);
2518         }
2519         agg = __get_first_agg(port);
2520         ad_agg_selection_logic(agg, &dummy);
2521
2522         spin_unlock_bh(&slave->bond->mode_lock);
2523
2524         netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2525                    port->actor_port_number,
2526                    link == BOND_LINK_UP ? "UP" : "DOWN");
2527
2528         /* RTNL is held and mode_lock is released so it's safe
2529          * to update slave_array here.
2530          */
2531         bond_update_slave_arr(slave->bond, NULL);
2532 }
2533
2534 /**
2535  * bond_3ad_set_carrier - set link state for bonding master
2536  * @bond - bonding structure
2537  *
2538  * if we have an active aggregator, we're up, if not, we're down.
2539  * Presumes that we cannot have an active aggregator if there are
2540  * no slaves with link up.
2541  *
2542  * This behavior complies with IEEE 802.3 section 43.3.9.
2543  *
2544  * Called by bond_set_carrier(). Return zero if carrier state does not
2545  * change, nonzero if it does.
2546  */
2547 int bond_3ad_set_carrier(struct bonding *bond)
2548 {
2549         struct aggregator *active;
2550         struct slave *first_slave;
2551         int ret = 1;
2552
2553         rcu_read_lock();
2554         first_slave = bond_first_slave_rcu(bond);
2555         if (!first_slave) {
2556                 ret = 0;
2557                 goto out;
2558         }
2559         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2560         if (active) {
2561                 /* are enough slaves available to consider link up? */
2562                 if (__agg_active_ports(active) < bond->params.min_links) {
2563                         if (netif_carrier_ok(bond->dev)) {
2564                                 netif_carrier_off(bond->dev);
2565                                 goto out;
2566                         }
2567                 } else if (!netif_carrier_ok(bond->dev)) {
2568                         netif_carrier_on(bond->dev);
2569                         goto out;
2570                 }
2571         } else if (netif_carrier_ok(bond->dev)) {
2572                 netif_carrier_off(bond->dev);
2573         }
2574 out:
2575         rcu_read_unlock();
2576         return ret;
2577 }
2578
2579 /**
2580  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2581  * @bond: bonding struct to work on
2582  * @ad_info: ad_info struct to fill with the bond's info
2583  *
2584  * Returns:   0 on success
2585  *          < 0 on error
2586  */
2587 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2588                                    struct ad_info *ad_info)
2589 {
2590         struct aggregator *aggregator = NULL;
2591         struct list_head *iter;
2592         struct slave *slave;
2593         struct port *port;
2594
2595         bond_for_each_slave_rcu(bond, slave, iter) {
2596                 port = &(SLAVE_AD_INFO(slave)->port);
2597                 if (port->aggregator && port->aggregator->is_active) {
2598                         aggregator = port->aggregator;
2599                         break;
2600                 }
2601         }
2602
2603         if (!aggregator)
2604                 return -1;
2605
2606         ad_info->aggregator_id = aggregator->aggregator_identifier;
2607         ad_info->ports = __agg_active_ports(aggregator);
2608         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2609         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2610         ether_addr_copy(ad_info->partner_system,
2611                         aggregator->partner_system.mac_addr_value);
2612         return 0;
2613 }
2614
2615 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2616 {
2617         int ret;
2618
2619         rcu_read_lock();
2620         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2621         rcu_read_unlock();
2622
2623         return ret;
2624 }
2625
2626 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2627                          struct slave *slave)
2628 {
2629         struct lacpdu *lacpdu, _lacpdu;
2630
2631         if (skb->protocol != PKT_TYPE_LACPDU)
2632                 return RX_HANDLER_ANOTHER;
2633
2634         if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2635                 return RX_HANDLER_ANOTHER;
2636
2637         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2638         if (!lacpdu)
2639                 return RX_HANDLER_ANOTHER;
2640
2641         return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2642 }
2643
2644 /**
2645  * bond_3ad_update_lacp_rate - change the lacp rate
2646  * @bond - bonding struct
2647  *
2648  * When modify lacp_rate parameter via sysfs,
2649  * update actor_oper_port_state of each port.
2650  *
2651  * Hold bond->mode_lock,
2652  * so we can modify port->actor_oper_port_state,
2653  * no matter bond is up or down.
2654  */
2655 void bond_3ad_update_lacp_rate(struct bonding *bond)
2656 {
2657         struct port *port = NULL;
2658         struct list_head *iter;
2659         struct slave *slave;
2660         int lacp_fast;
2661
2662         lacp_fast = bond->params.lacp_fast;
2663         spin_lock_bh(&bond->mode_lock);
2664         bond_for_each_slave(bond, slave, iter) {
2665                 port = &(SLAVE_AD_INFO(slave)->port);
2666                 if (lacp_fast)
2667                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2668                 else
2669                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2670         }
2671         spin_unlock_bh(&bond->mode_lock);
2672 }