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                         if (slave->speed != SPEED_UNKNOWN)
 344                                 pr_warn_once("%s: unknown ethtool speed (%d) for port %d (set it to 0)\n",
 345                                              slave->bond->dev->name,
 346                                              slave->speed,
 347                                              port->actor_port_number);
 348                         speed = 0;
 349                         break;
 350                 }
 351         }
 352
 353         netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
 354                    port->actor_port_number, speed);
 355         return speed;
 356 }
 357
 358 /**
 359  * __get_duplex - get a port's duplex
 360  * @port: the port we're looking at
 361  *
 362  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 363  *     0x01 if in full duplex
 364  *     0x00 otherwise
 365  */
 366 static u8 __get_duplex(struct port *port)
 367 {
 368         struct slave *slave = port->slave;
 369         u8 retval = 0x0;
 370
 371         /* handling a special case: when the configuration starts with
 372          * link down, it sets the duplex to 0.
 373          */
 374         if (slave->link == BOND_LINK_UP) {
 375                 switch (slave->duplex) {
 376                 case DUPLEX_FULL:
 377                         retval = 0x1;
 378                         netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
 379                                    port->actor_port_number);
 380                         break;
 381                 case DUPLEX_HALF:
 382                 default:
 383                         retval = 0x0;
 384                         netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
 385                                    port->actor_port_number);
 386                         break;
 387                 }
 388         }
 389         return retval;
 390 }
 391
 392 static void __ad_actor_update_port(struct port *port)
 393 {
 394         const struct bonding *bond = bond_get_bond_by_slave(port->slave);
 395
 396         port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
 397         port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
 398 }
 399
 400 /* Conversions */
 401
 402 /**
 403  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 404  * @timer_type: which timer to operate
 405  * @par: timer parameter. see below
 406  *
 407  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 408  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 409  *                                                   %SLOW_PERIODIC_TIME.
 410  */
 411 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 412 {
 413         u16 retval = 0; /* to silence the compiler */
 414
 415         switch (timer_type) {
 416         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 417                 if (par)
 418                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 419                 else
 420                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 421                 break;
 422         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 423                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 424                 break;
 425         case AD_PERIODIC_TIMER:         /* for periodic machine */
 426                 retval = (par*ad_ticks_per_sec); /* long timeout */
 427                 break;
 428         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 429                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 430                 break;
 431         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 432                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 433                 break;
 434         }
 435
 436         return retval;
 437 }
 438
 439
 440 /* ================= ad_rx_machine helper functions ================== */
 441
 442 /**
 443  * __choose_matched - update a port's matched variable from a received lacpdu
 444  * @lacpdu: the lacpdu we've received
 445  * @port: the port we're looking at
 446  *
 447  * Update the value of the matched variable, using parameter values from a
 448  * newly received lacpdu. Parameter values for the partner carried in the
 449  * received PDU are compared with the corresponding operational parameter
 450  * values for the actor. Matched is set to TRUE if all of these parameters
 451  * match and the PDU parameter partner_state.aggregation has the same value as
 452  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 453  * in the aggregation. Matched is also set to TRUE if the value of
 454  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 455  * an individual link and lacp will actively maintain the link. Otherwise,
 456  * matched is set to FALSE. LACP is considered to be actively maintaining the
 457  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 458  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 459  * partner_state.lacp_activity variables are TRUE.
 460  *
 461  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 462  * used here to implement the language from 802.3ad 43.4.9 that requires
 463  * recordPDU to "match" the LACPDU parameters to the stored values.
 464  */
 465 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 466 {
 467         /* check if all parameters are alike
 468          * or this is individual link(aggregation == FALSE)
 469          * then update the state machine Matched variable.
 470          */
 471         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 472              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 473              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 474              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 475              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 476              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 477             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 478                 ) {
 479                 port->sm_vars |= AD_PORT_MATCHED;
 480         } else {
 481                 port->sm_vars &= ~AD_PORT_MATCHED;
 482         }
 483 }
 484
 485 /**
 486  * __record_pdu - record parameters from a received lacpdu
 487  * @lacpdu: the lacpdu we've received
 488  * @port: the port we're looking at
 489  *
 490  * Record the parameter values for the Actor carried in a received lacpdu as
 491  * the current partner operational parameter values and sets
 492  * actor_oper_port_state.defaulted to FALSE.
 493  */
 494 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 495 {
 496         if (lacpdu && port) {
 497                 struct port_params *partner = &port->partner_oper;
 498
 499                 __choose_matched(lacpdu, port);
 500                 /* record the new parameter values for the partner
 501                  * operational
 502                  */
 503                 partner->port_number = ntohs(lacpdu->actor_port);
 504                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 505                 partner->system = lacpdu->actor_system;
 506                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 507                 partner->key = ntohs(lacpdu->actor_key);
 508                 partner->port_state = lacpdu->actor_state;
 509
 510                 /* set actor_oper_port_state.defaulted to FALSE */
 511                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 512
 513                 /* set the partner sync. to on if the partner is sync,
 514                  * and the port is matched
 515                  */
 516                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 517                     (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 518                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 519                         pr_debug("%s partner sync=1\n", port->slave->dev->name);
 520                 } else {
 521                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 522                         pr_debug("%s partner sync=0\n", port->slave->dev->name);
 523                 }
 524         }
 525 }
 526
 527 /**
 528  * __record_default - record default parameters
 529  * @port: the port we're looking at
 530  *
 531  * This function records the default parameter values for the partner carried
 532  * in the Partner Admin parameters as the current partner operational parameter
 533  * values and sets actor_oper_port_state.defaulted to TRUE.
 534  */
 535 static void __record_default(struct port *port)
 536 {
 537         if (port) {
 538                 /* record the partner admin parameters */
 539                 memcpy(&port->partner_oper, &port->partner_admin,
 540                        sizeof(struct port_params));
 541
 542                 /* set actor_oper_port_state.defaulted to true */
 543                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 544         }
 545 }
 546
 547 /**
 548  * __update_selected - update a port's Selected variable from a received lacpdu
 549  * @lacpdu: the lacpdu we've received
 550  * @port: the port we're looking at
 551  *
 552  * Update the value of the selected variable, using parameter values from a
 553  * newly received lacpdu. The parameter values for the Actor carried in the
 554  * received PDU are compared with the corresponding operational parameter
 555  * values for the ports partner. If one or more of the comparisons shows that
 556  * the value(s) received in the PDU differ from the current operational values,
 557  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 558  * set to out_of_sync. Otherwise, selected remains unchanged.
 559  */
 560 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 561 {
 562         if (lacpdu && port) {
 563                 const struct port_params *partner = &port->partner_oper;
 564
 565                 /* check if any parameter is different then
 566                  * update the state machine selected variable.
 567                  */
 568                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 569                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 570                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 571                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 572                     ntohs(lacpdu->actor_key) != partner->key ||
 573                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 574                         port->sm_vars &= ~AD_PORT_SELECTED;
 575                 }
 576         }
 577 }
 578
 579 /**
 580  * __update_default_selected - update a port's Selected variable from Partner
 581  * @port: the port we're looking at
 582  *
 583  * This function updates the value of the selected variable, using the partner
 584  * administrative parameter values. The administrative values are compared with
 585  * the corresponding operational parameter values for the partner. If one or
 586  * more of the comparisons shows that the administrative value(s) differ from
 587  * the current operational values, then Selected is set to FALSE and
 588  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 589  * Selected remains unchanged.
 590  */
 591 static void __update_default_selected(struct port *port)
 592 {
 593         if (port) {
 594                 const struct port_params *admin = &port->partner_admin;
 595                 const struct port_params *oper = &port->partner_oper;
 596
 597                 /* check if any parameter is different then
 598                  * update the state machine selected variable.
 599                  */
 600                 if (admin->port_number != oper->port_number ||
 601                     admin->port_priority != oper->port_priority ||
 602                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 603                     admin->system_priority != oper->system_priority ||
 604                     admin->key != oper->key ||
 605                     (admin->port_state & AD_STATE_AGGREGATION)
 606                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 607                         port->sm_vars &= ~AD_PORT_SELECTED;
 608                 }
 609         }
 610 }
 611
 612 /**
 613  * __update_ntt - update a port's ntt variable from a received lacpdu
 614  * @lacpdu: the lacpdu we've received
 615  * @port: the port we're looking at
 616  *
 617  * Updates the value of the ntt variable, using parameter values from a newly
 618  * received lacpdu. The parameter values for the partner carried in the
 619  * received PDU are compared with the corresponding operational parameter
 620  * values for the Actor. If one or more of the comparisons shows that the
 621  * value(s) received in the PDU differ from the current operational values,
 622  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 623  */
 624 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 625 {
 626         /* validate lacpdu and port */
 627         if (lacpdu && port) {
 628                 /* check if any parameter is different then
 629                  * update the port->ntt.
 630                  */
 631                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 632                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 633                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 634                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 635                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 636                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 637                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 638                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 639                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 640                    ) {
 641                         port->ntt = true;
 642                 }
 643         }
 644 }
 645
 646 /**
 647  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 648  * @aggregator: the aggregator we're looking at
 649  *
 650  */
 651 static int __agg_ports_are_ready(struct aggregator *aggregator)
 652 {
 653         struct port *port;
 654         int retval = 1;
 655
 656         if (aggregator) {
 657                 /* scan all ports in this aggregator to verfy if they are
 658                  * all ready.
 659                  */
 660                 for (port = aggregator->lag_ports;
 661                      port;
 662                      port = port->next_port_in_aggregator) {
 663                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 664                                 retval = 0;
 665                                 break;
 666                         }
 667                 }
 668         }
 669
 670         return retval;
 671 }
 672
 673 /**
 674  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 675  * @aggregator: the aggregator we're looking at
 676  * @val: Should the ports' ready bit be set on or off
 677  *
 678  */
 679 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 680 {
 681         struct port *port;
 682
 683         for (port = aggregator->lag_ports; port;
 684              port = port->next_port_in_aggregator) {
 685                 if (val)
 686                         port->sm_vars |= AD_PORT_READY;
 687                 else
 688                         port->sm_vars &= ~AD_PORT_READY;
 689         }
 690 }
 691
 692 static int __agg_active_ports(struct aggregator *agg)
 693 {
 694         struct port *port;
 695         int active = 0;
 696
 697         for (port = agg->lag_ports; port;
 698              port = port->next_port_in_aggregator) {
 699                 if (port->is_enabled)
 700                         active++;
 701         }
 702
 703         return active;
 704 }
 705
 706 /**
 707  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 708  * @aggregator: the aggregator we're looking at
 709  *
 710  */
 711 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 712 {
 713         int nports = __agg_active_ports(aggregator);
 714         u32 bandwidth = 0;
 715
 716         if (nports) {
 717                 switch (__get_link_speed(aggregator->lag_ports)) {
 718                 case AD_LINK_SPEED_1MBPS:
 719                         bandwidth = nports;
 720                         break;
 721                 case AD_LINK_SPEED_10MBPS:
 722                         bandwidth = nports * 10;
 723                         break;
 724                 case AD_LINK_SPEED_100MBPS:
 725                         bandwidth = nports * 100;
 726                         break;
 727                 case AD_LINK_SPEED_1000MBPS:
 728                         bandwidth = nports * 1000;
 729                         break;
 730                 case AD_LINK_SPEED_2500MBPS:
 731                         bandwidth = nports * 2500;
 732                         break;
 733                 case AD_LINK_SPEED_5000MBPS:
 734                         bandwidth = nports * 5000;
 735                         break;
 736                 case AD_LINK_SPEED_10000MBPS:
 737                         bandwidth = nports * 10000;
 738                         break;
 739                 case AD_LINK_SPEED_14000MBPS:
 740                         bandwidth = nports * 14000;
 741                         break;
 742                 case AD_LINK_SPEED_20000MBPS:
 743                         bandwidth = nports * 20000;
 744                         break;
 745                 case AD_LINK_SPEED_25000MBPS:
 746                         bandwidth = nports * 25000;
 747                         break;
 748                 case AD_LINK_SPEED_40000MBPS:
 749                         bandwidth = nports * 40000;
 750                         break;
 751                 case AD_LINK_SPEED_50000MBPS:
 752                         bandwidth = nports * 50000;
 753                         break;
 754                 case AD_LINK_SPEED_56000MBPS:
 755                         bandwidth = nports * 56000;
 756                         break;
 757                 case AD_LINK_SPEED_100000MBPS:
 758                         bandwidth = nports * 100000;
 759                         break;
 760                 default:
 761                         bandwidth = 0; /* to silence the compiler */
 762                 }
 763         }
 764         return bandwidth;
 765 }
 766
 767 /**
 768  * __get_active_agg - get the current active aggregator
 769  * @aggregator: the aggregator we're looking at
 770  *
 771  * Caller must hold RCU lock.
 772  */
 773 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 774 {
 775         struct bonding *bond = aggregator->slave->bond;
 776         struct list_head *iter;
 777         struct slave *slave;
 778
 779         bond_for_each_slave_rcu(bond, slave, iter)
 780                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 781                         return &(SLAVE_AD_INFO(slave)->aggregator);
 782
 783         return NULL;
 784 }
 785
 786 /**
 787  * __update_lacpdu_from_port - update a port's lacpdu fields
 788  * @port: the port we're looking at
 789  */
 790 static inline void __update_lacpdu_from_port(struct port *port)
 791 {
 792         struct lacpdu *lacpdu = &port->lacpdu;
 793         const struct port_params *partner = &port->partner_oper;
 794
 795         /* update current actual Actor parameters
 796          * lacpdu->subtype                   initialized
 797          * lacpdu->version_number            initialized
 798          * lacpdu->tlv_type_actor_info       initialized
 799          * lacpdu->actor_information_length  initialized
 800          */
 801
 802         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 803         lacpdu->actor_system = port->actor_system;
 804         lacpdu->actor_key = htons(port->actor_oper_port_key);
 805         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 806         lacpdu->actor_port = htons(port->actor_port_number);
 807         lacpdu->actor_state = port->actor_oper_port_state;
 808         pr_debug("update lacpdu: %s, actor port state %x\n",
 809                  port->slave->dev->name, port->actor_oper_port_state);
 810
 811         /* lacpdu->reserved_3_1              initialized
 812          * lacpdu->tlv_type_partner_info     initialized
 813          * lacpdu->partner_information_length initialized
 814          */
 815
 816         lacpdu->partner_system_priority = htons(partner->system_priority);
 817         lacpdu->partner_system = partner->system;
 818         lacpdu->partner_key = htons(partner->key);
 819         lacpdu->partner_port_priority = htons(partner->port_priority);
 820         lacpdu->partner_port = htons(partner->port_number);
 821         lacpdu->partner_state = partner->port_state;
 822
 823         /* lacpdu->reserved_3_2              initialized
 824          * lacpdu->tlv_type_collector_info   initialized
 825          * lacpdu->collector_information_length initialized
 826          * collector_max_delay                initialized
 827          * reserved_12[12]                   initialized
 828          * tlv_type_terminator               initialized
 829          * terminator_length                 initialized
 830          * reserved_50[50]                   initialized
 831          */
 832 }
 833
 834 /* ================= main 802.3ad protocol code ========================= */
 835
 836 /**
 837  * ad_lacpdu_send - send out a lacpdu packet on a given port
 838  * @port: the port we're looking at
 839  *
 840  * Returns:   0 on success
 841  *          < 0 on error
 842  */
 843 static int ad_lacpdu_send(struct port *port)
 844 {
 845         struct slave *slave = port->slave;
 846         struct sk_buff *skb;
 847         struct lacpdu_header *lacpdu_header;
 848         int length = sizeof(struct lacpdu_header);
 849
 850         skb = dev_alloc_skb(length);
 851         if (!skb)
 852                 return -ENOMEM;
 853
 854         skb->dev = slave->dev;
 855         skb_reset_mac_header(skb);
 856         skb->network_header = skb->mac_header + ETH_HLEN;
 857         skb->protocol = PKT_TYPE_LACPDU;
 858         skb->priority = TC_PRIO_CONTROL;
 859
 860         lacpdu_header = skb_put(skb, length);
 861
 862         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 863         /* Note: source address is set to be the member's PERMANENT address,
 864          * because we use it to identify loopback lacpdus in receive.
 865          */
 866         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 867         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 868
 869         lacpdu_header->lacpdu = port->lacpdu;
 870
 871         dev_queue_xmit(skb);
 872
 873         return 0;
 874 }
 875
 876 /**
 877  * ad_marker_send - send marker information/response on a given port
 878  * @port: the port we're looking at
 879  * @marker: marker data to send
 880  *
 881  * Returns:   0 on success
 882  *          < 0 on error
 883  */
 884 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 885 {
 886         struct slave *slave = port->slave;
 887         struct sk_buff *skb;
 888         struct bond_marker_header *marker_header;
 889         int length = sizeof(struct bond_marker_header);
 890
 891         skb = dev_alloc_skb(length + 16);
 892         if (!skb)
 893                 return -ENOMEM;
 894
 895         skb_reserve(skb, 16);
 896
 897         skb->dev = slave->dev;
 898         skb_reset_mac_header(skb);
 899         skb->network_header = skb->mac_header + ETH_HLEN;
 900         skb->protocol = PKT_TYPE_LACPDU;
 901
 902         marker_header = skb_put(skb, length);
 903
 904         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 905         /* Note: source address is set to be the member's PERMANENT address,
 906          * because we use it to identify loopback MARKERs in receive.
 907          */
 908         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 909         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 910
 911         marker_header->marker = *marker;
 912
 913         dev_queue_xmit(skb);
 914
 915         return 0;
 916 }
 917
 918 /**
 919  * ad_mux_machine - handle a port's mux state machine
 920  * @port: the port we're looking at
 921  * @update_slave_arr: Does slave array need update?
 922  */
 923 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 924 {
 925         mux_states_t last_state;
 926
 927         /* keep current State Machine state to compare later if it was
 928          * changed
 929          */
 930         last_state = port->sm_mux_state;
 931
 932         if (port->sm_vars & AD_PORT_BEGIN) {
 933                 port->sm_mux_state = AD_MUX_DETACHED;
 934         } else {
 935                 switch (port->sm_mux_state) {
 936                 case AD_MUX_DETACHED:
 937                         if ((port->sm_vars & AD_PORT_SELECTED)
 938                             || (port->sm_vars & AD_PORT_STANDBY))
 939                                 /* if SELECTED or STANDBY */
 940                                 port->sm_mux_state = AD_MUX_WAITING;
 941                         break;
 942                 case AD_MUX_WAITING:
 943                         /* if SELECTED == FALSE return to DETACH state */
 944                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 945                                 port->sm_vars &= ~AD_PORT_READY_N;
 946                                 /* in order to withhold the Selection Logic to
 947                                  * check all ports READY_N value every callback
 948                                  * cycle to update ready variable, we check
 949                                  * READY_N and update READY here
 950                                  */
 951                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 952                                 port->sm_mux_state = AD_MUX_DETACHED;
 953                                 break;
 954                         }
 955
 956                         /* check if the wait_while_timer expired */
 957                         if (port->sm_mux_timer_counter
 958                             && !(--port->sm_mux_timer_counter))
 959                                 port->sm_vars |= AD_PORT_READY_N;
 960
 961                         /* in order to withhold the selection logic to check
 962                          * all ports READY_N value every callback cycle to
 963                          * update ready variable, we check READY_N and update
 964                          * READY here
 965                          */
 966                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 967
 968                         /* if the wait_while_timer expired, and the port is
 969                          * in READY state, move to ATTACHED state
 970                          */
 971                         if ((port->sm_vars & AD_PORT_READY)
 972                             && !port->sm_mux_timer_counter)
 973                                 port->sm_mux_state = AD_MUX_ATTACHED;
 974                         break;
 975                 case AD_MUX_ATTACHED:
 976                         /* check also if agg_select_timer expired (so the
 977                          * edable port will take place only after this timer)
 978                          */
 979                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 980                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 981                             !__check_agg_selection_timer(port)) {
 982                                 if (port->aggregator->is_active)
 983                                         port->sm_mux_state =
 984                                             AD_MUX_COLLECTING_DISTRIBUTING;
 985                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 986                                    (port->sm_vars & AD_PORT_STANDBY)) {
 987                                 /* if UNSELECTED or STANDBY */
 988                                 port->sm_vars &= ~AD_PORT_READY_N;
 989                                 /* in order to withhold the selection logic to
 990                                  * check all ports READY_N value every callback
 991                                  * cycle to update ready variable, we check
 992                                  * READY_N and update READY here
 993                                  */
 994                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 995                                 port->sm_mux_state = AD_MUX_DETACHED;
 996                         } else if (port->aggregator->is_active) {
 997                                 port->actor_oper_port_state |=
 998                                     AD_STATE_SYNCHRONIZATION;
 999                         }
1000                         break;
1001                 case AD_MUX_COLLECTING_DISTRIBUTING:
1002                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
1003                             (port->sm_vars & AD_PORT_STANDBY) ||
1004                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
1005                             !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
1006                                 port->sm_mux_state = AD_MUX_ATTACHED;
1007                         } else {
1008                                 /* if port state hasn't changed make
1009                                  * sure that a collecting distributing
1010                                  * port in an active aggregator is enabled
1011                                  */
1012                                 if (port->aggregator &&
1013                                     port->aggregator->is_active &&
1014                                     !__port_is_enabled(port)) {
1015
1016                                         __enable_port(port);
1017                                 }
1018                         }
1019                         break;
1020                 default:
1021                         break;
1022                 }
1023         }
1024
1025         /* check if the state machine was changed */
1026         if (port->sm_mux_state != last_state) {
1027                 pr_debug("Mux Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1028                          port->actor_port_number,
1029                          port->slave->dev->name,
1030                          last_state,
1031                          port->sm_mux_state);
1032                 switch (port->sm_mux_state) {
1033                 case AD_MUX_DETACHED:
1034                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1035                         ad_disable_collecting_distributing(port,
1036                                                            update_slave_arr);
1037                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1038                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1039                         port->ntt = true;
1040                         break;
1041                 case AD_MUX_WAITING:
1042                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1043                         break;
1044                 case AD_MUX_ATTACHED:
1045                         if (port->aggregator->is_active)
1046                                 port->actor_oper_port_state |=
1047                                     AD_STATE_SYNCHRONIZATION;
1048                         else
1049                                 port->actor_oper_port_state &=
1050                                     ~AD_STATE_SYNCHRONIZATION;
1051                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1052                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1053                         ad_disable_collecting_distributing(port,
1054                                                            update_slave_arr);
1055                         port->ntt = true;
1056                         break;
1057                 case AD_MUX_COLLECTING_DISTRIBUTING:
1058                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1059                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1060                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1061                         ad_enable_collecting_distributing(port,
1062                                                           update_slave_arr);
1063                         port->ntt = true;
1064                         break;
1065                 default:
1066                         break;
1067                 }
1068         }
1069 }
1070
1071 /**
1072  * ad_rx_machine - handle a port's rx State Machine
1073  * @lacpdu: the lacpdu we've received
1074  * @port: the port we're looking at
1075  *
1076  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1077  * CURRENT. If timer expired set the state machine in the proper state.
1078  * In other cases, this function checks if we need to switch to other state.
1079  */
1080 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1081 {
1082         rx_states_t last_state;
1083
1084         /* keep current State Machine state to compare later if it was
1085          * changed
1086          */
1087         last_state = port->sm_rx_state;
1088
1089         /* check if state machine should change state */
1090
1091         /* first, check if port was reinitialized */
1092         if (port->sm_vars & AD_PORT_BEGIN) {
1093                 port->sm_rx_state = AD_RX_INITIALIZE;
1094                 port->sm_vars |= AD_PORT_CHURNED;
1095         /* check if port is not enabled */
1096         } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1097                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1098         /* check if new lacpdu arrived */
1099         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1100                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1101                  (port->sm_rx_state == AD_RX_CURRENT))) {
1102                 if (port->sm_rx_state != AD_RX_CURRENT)
1103                         port->sm_vars |= AD_PORT_CHURNED;
1104                 port->sm_rx_timer_counter = 0;
1105                 port->sm_rx_state = AD_RX_CURRENT;
1106         } else {
1107                 /* if timer is on, and if it is expired */
1108                 if (port->sm_rx_timer_counter &&
1109                     !(--port->sm_rx_timer_counter)) {
1110                         switch (port->sm_rx_state) {
1111                         case AD_RX_EXPIRED:
1112                                 port->sm_rx_state = AD_RX_DEFAULTED;
1113                                 break;
1114                         case AD_RX_CURRENT:
1115                                 port->sm_rx_state = AD_RX_EXPIRED;
1116                                 break;
1117                         default:
1118                                 break;
1119                         }
1120                 } else {
1121                         /* if no lacpdu arrived and no timer is on */
1122                         switch (port->sm_rx_state) {
1123                         case AD_RX_PORT_DISABLED:
1124                                 if (port->is_enabled &&
1125                                     (port->sm_vars & AD_PORT_LACP_ENABLED))
1126                                         port->sm_rx_state = AD_RX_EXPIRED;
1127                                 else if (port->is_enabled
1128                                          && ((port->sm_vars
1129                                               & AD_PORT_LACP_ENABLED) == 0))
1130                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1131                                 break;
1132                         default:
1133                                 break;
1134
1135                         }
1136                 }
1137         }
1138
1139         /* check if the State machine was changed or new lacpdu arrived */
1140         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1141                 pr_debug("Rx Machine: Port=%d (%s), Last State=%d, Curr State=%d\n",
1142                          port->actor_port_number,
1143                          port->slave->dev->name,
1144                          last_state,
1145                          port->sm_rx_state);
1146                 switch (port->sm_rx_state) {
1147                 case AD_RX_INITIALIZE:
1148                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1149                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1150                         else
1151                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1152                         port->sm_vars &= ~AD_PORT_SELECTED;
1153                         __record_default(port);
1154                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1155                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1156
1157                         /* Fall Through */
1158                 case AD_RX_PORT_DISABLED:
1159                         port->sm_vars &= ~AD_PORT_MATCHED;
1160                         break;
1161                 case AD_RX_LACP_DISABLED:
1162                         port->sm_vars &= ~AD_PORT_SELECTED;
1163                         __record_default(port);
1164                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1165                         port->sm_vars |= AD_PORT_MATCHED;
1166                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1167                         break;
1168                 case AD_RX_EXPIRED:
1169                         /* Reset of the Synchronization flag (Standard 43.4.12)
1170                          * This reset cause to disable this port in the
1171                          * COLLECTING_DISTRIBUTING state of the mux machine in
1172                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1173                          * the port.
1174                          */
1175                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1176                         port->sm_vars &= ~AD_PORT_MATCHED;
1177                         port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1178                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1179                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1180                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1181                         port->sm_vars |= AD_PORT_CHURNED;
1182                         break;
1183                 case AD_RX_DEFAULTED:
1184                         __update_default_selected(port);
1185                         __record_default(port);
1186                         port->sm_vars |= AD_PORT_MATCHED;
1187                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1188                         break;
1189                 case AD_RX_CURRENT:
1190                         /* detect loopback situation */
1191                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1192                                               &(port->actor_system))) {
1193                                 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1194                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1195                                        port->slave->dev->name);
1196                                 return;
1197                         }
1198                         __update_selected(lacpdu, port);
1199                         __update_ntt(lacpdu, port);
1200                         __record_pdu(lacpdu, port);
1201                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1202                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1203                         break;
1204                 default:
1205                         break;
1206                 }
1207         }
1208 }
1209
1210 /**
1211  * ad_churn_machine - handle port churn's state machine
1212  * @port: the port we're looking at
1213  *
1214  */
1215 static void ad_churn_machine(struct port *port)
1216 {
1217         if (port->sm_vars & AD_PORT_CHURNED) {
1218                 port->sm_vars &= ~AD_PORT_CHURNED;
1219                 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1220                 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1221                 port->sm_churn_actor_timer_counter =
1222                         __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1223                  port->sm_churn_partner_timer_counter =
1224                          __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1225                 return;
1226         }
1227         if (port->sm_churn_actor_timer_counter &&
1228             !(--port->sm_churn_actor_timer_counter) &&
1229             port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1230                 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1231                         port->sm_churn_actor_state = AD_NO_CHURN;
1232                 } else {
1233                         port->churn_actor_count++;
1234                         port->sm_churn_actor_state = AD_CHURN;
1235                 }
1236         }
1237         if (port->sm_churn_partner_timer_counter &&
1238             !(--port->sm_churn_partner_timer_counter) &&
1239             port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1240                 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1241                         port->sm_churn_partner_state = AD_NO_CHURN;
1242                 } else {
1243                         port->churn_partner_count++;
1244                         port->sm_churn_partner_state = AD_CHURN;
1245                 }
1246         }
1247 }
1248
1249 /**
1250  * ad_tx_machine - handle a port's tx state machine
1251  * @port: the port we're looking at
1252  */
1253 static void ad_tx_machine(struct port *port)
1254 {
1255         /* check if tx timer expired, to verify that we do not send more than
1256          * 3 packets per second
1257          */
1258         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1259                 /* check if there is something to send */
1260                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1261                         __update_lacpdu_from_port(port);
1262
1263                         if (ad_lacpdu_send(port) >= 0) {
1264                                 pr_debug("Sent LACPDU on port %d\n",
1265                                          port->actor_port_number);
1266
1267                                 /* mark ntt as false, so it will not be sent
1268                                  * again until demanded
1269                                  */
1270                                 port->ntt = false;
1271                         }
1272                 }
1273                 /* restart tx timer(to verify that we will not exceed
1274                  * AD_MAX_TX_IN_SECOND
1275                  */
1276                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1277         }
1278 }
1279
1280 /**
1281  * ad_periodic_machine - handle a port's periodic state machine
1282  * @port: the port we're looking at
1283  *
1284  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1285  */
1286 static void ad_periodic_machine(struct port *port)
1287 {
1288         periodic_states_t last_state;
1289
1290         /* keep current state machine state to compare later if it was changed */
1291         last_state = port->sm_periodic_state;
1292
1293         /* check if port was reinitialized */
1294         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1295             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1296            ) {
1297                 port->sm_periodic_state = AD_NO_PERIODIC;
1298         }
1299         /* check if state machine should change state */
1300         else if (port->sm_periodic_timer_counter) {
1301                 /* check if periodic state machine expired */
1302                 if (!(--port->sm_periodic_timer_counter)) {
1303                         /* if expired then do tx */
1304                         port->sm_periodic_state = AD_PERIODIC_TX;
1305                 } else {
1306                         /* If not expired, check if there is some new timeout
1307                          * parameter from the partner state
1308                          */
1309                         switch (port->sm_periodic_state) {
1310                         case AD_FAST_PERIODIC:
1311                                 if (!(port->partner_oper.port_state
1312                                       & AD_STATE_LACP_TIMEOUT))
1313                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1314                                 break;
1315                         case AD_SLOW_PERIODIC:
1316                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1317                                         port->sm_periodic_timer_counter = 0;
1318                                         port->sm_periodic_state = AD_PERIODIC_TX;
1319                                 }
1320                                 break;
1321                         default:
1322                                 break;
1323                         }
1324                 }
1325         } else {
1326                 switch (port->sm_periodic_state) {
1327                 case AD_NO_PERIODIC:
1328                         port->sm_periodic_state = AD_FAST_PERIODIC;
1329                         break;
1330                 case AD_PERIODIC_TX:
1331                         if (!(port->partner_oper.port_state &
1332                             AD_STATE_LACP_TIMEOUT))
1333                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1334                         else
1335                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1336                         break;
1337                 default:
1338                         break;
1339                 }
1340         }
1341
1342         /* check if the state machine was changed */
1343         if (port->sm_periodic_state != last_state) {
1344                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1345                          port->actor_port_number, last_state,
1346                          port->sm_periodic_state);
1347                 switch (port->sm_periodic_state) {
1348                 case AD_NO_PERIODIC:
1349                         port->sm_periodic_timer_counter = 0;
1350                         break;
1351                 case AD_FAST_PERIODIC:
1352                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1353                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1354                         break;
1355                 case AD_SLOW_PERIODIC:
1356                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1357                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1358                         break;
1359                 case AD_PERIODIC_TX:
1360                         port->ntt = true;
1361                         break;
1362                 default:
1363                         break;
1364                 }
1365         }
1366 }
1367
1368 /**
1369  * ad_port_selection_logic - select aggregation groups
1370  * @port: the port we're looking at
1371  * @update_slave_arr: Does slave array need update?
1372  *
1373  * Select aggregation groups, and assign each port for it's aggregetor. The
1374  * selection logic is called in the inititalization (after all the handshkes),
1375  * and after every lacpdu receive (if selected is off).
1376  */
1377 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1378 {
1379         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1380         struct port *last_port = NULL, *curr_port;
1381         struct list_head *iter;
1382         struct bonding *bond;
1383         struct slave *slave;
1384         int found = 0;
1385
1386         /* if the port is already Selected, do nothing */
1387         if (port->sm_vars & AD_PORT_SELECTED)
1388                 return;
1389
1390         bond = __get_bond_by_port(port);
1391
1392         /* if the port is connected to other aggregator, detach it */
1393         if (port->aggregator) {
1394                 /* detach the port from its former aggregator */
1395                 temp_aggregator = port->aggregator;
1396                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1397                      last_port = curr_port,
1398                      curr_port = curr_port->next_port_in_aggregator) {
1399                         if (curr_port == port) {
1400                                 temp_aggregator->num_of_ports--;
1401                                 /* if it is the first port attached to the
1402                                  * aggregator
1403                                  */
1404                                 if (!last_port) {
1405                                         temp_aggregator->lag_ports =
1406                                                 port->next_port_in_aggregator;
1407                                 } else {
1408                                         /* not the first port attached to the
1409                                          * aggregator
1410                                          */
1411                                         last_port->next_port_in_aggregator =
1412                                                 port->next_port_in_aggregator;
1413                                 }
1414
1415                                 /* clear the port's relations to this
1416                                  * aggregator
1417                                  */
1418                                 port->aggregator = NULL;
1419                                 port->next_port_in_aggregator = NULL;
1420                                 port->actor_port_aggregator_identifier = 0;
1421
1422                                 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1423                                            port->actor_port_number,
1424                                            temp_aggregator->aggregator_identifier);
1425                                 /* if the aggregator is empty, clear its
1426                                  * parameters, and set it ready to be attached
1427                                  */
1428                                 if (!temp_aggregator->lag_ports)
1429                                         ad_clear_agg(temp_aggregator);
1430                                 break;
1431                         }
1432                 }
1433                 if (!curr_port) {
1434                         /* meaning: the port was related to an aggregator
1435                          * but was not on the aggregator port list
1436                          */
1437                         net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1438                                              port->slave->bond->dev->name,
1439                                              port->actor_port_number,
1440                                              port->slave->dev->name,
1441                                              port->aggregator->aggregator_identifier);
1442                 }
1443         }
1444         /* search on all aggregators for a suitable aggregator for this port */
1445         bond_for_each_slave(bond, slave, iter) {
1446                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1447
1448                 /* keep a free aggregator for later use(if needed) */
1449                 if (!aggregator->lag_ports) {
1450                         if (!free_aggregator)
1451                                 free_aggregator = aggregator;
1452                         continue;
1453                 }
1454                 /* check if current aggregator suits us */
1455                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1456                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1457                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1458                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1459                     ) &&
1460                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1461                       !aggregator->is_individual)  /* but is not individual OR */
1462                     )
1463                    ) {
1464                         /* attach to the founded aggregator */
1465                         port->aggregator = aggregator;
1466                         port->actor_port_aggregator_identifier =
1467                                 port->aggregator->aggregator_identifier;
1468                         port->next_port_in_aggregator = aggregator->lag_ports;
1469                         port->aggregator->num_of_ports++;
1470                         aggregator->lag_ports = port;
1471                         netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1472                                    port->actor_port_number,
1473                                    port->aggregator->aggregator_identifier);
1474
1475                         /* mark this port as selected */
1476                         port->sm_vars |= AD_PORT_SELECTED;
1477                         found = 1;
1478                         break;
1479                 }
1480         }
1481
1482         /* the port couldn't find an aggregator - attach it to a new
1483          * aggregator
1484          */
1485         if (!found) {
1486                 if (free_aggregator) {
1487                         /* assign port a new aggregator */
1488                         port->aggregator = free_aggregator;
1489                         port->actor_port_aggregator_identifier =
1490                                 port->aggregator->aggregator_identifier;
1491
1492                         /* update the new aggregator's parameters
1493                          * if port was responsed from the end-user
1494                          */
1495                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1496                                 /* if port is full duplex */
1497                                 port->aggregator->is_individual = false;
1498                         else
1499                                 port->aggregator->is_individual = true;
1500
1501                         port->aggregator->actor_admin_aggregator_key =
1502                                 port->actor_admin_port_key;
1503                         port->aggregator->actor_oper_aggregator_key =
1504                                 port->actor_oper_port_key;
1505                         port->aggregator->partner_system =
1506                                 port->partner_oper.system;
1507                         port->aggregator->partner_system_priority =
1508                                 port->partner_oper.system_priority;
1509                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1510                         port->aggregator->receive_state = 1;
1511                         port->aggregator->transmit_state = 1;
1512                         port->aggregator->lag_ports = port;
1513                         port->aggregator->num_of_ports++;
1514
1515                         /* mark this port as selected */
1516                         port->sm_vars |= AD_PORT_SELECTED;
1517
1518                         netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1519                                    port->actor_port_number,
1520                                    port->aggregator->aggregator_identifier);
1521                 } else {
1522                         netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1523                                port->actor_port_number, port->slave->dev->name);
1524                 }
1525         }
1526         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1527          * in all aggregator's ports, else set ready=FALSE in all
1528          * aggregator's ports
1529          */
1530         __set_agg_ports_ready(port->aggregator,
1531                               __agg_ports_are_ready(port->aggregator));
1532
1533         aggregator = __get_first_agg(port);
1534         ad_agg_selection_logic(aggregator, update_slave_arr);
1535
1536         if (!port->aggregator->is_active)
1537                 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1538 }
1539
1540 /* Decide if "agg" is a better choice for the new active aggregator that
1541  * the current best, according to the ad_select policy.
1542  */
1543 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1544                                                 struct aggregator *curr)
1545 {
1546         /* 0. If no best, select current.
1547          *
1548          * 1. If the current agg is not individual, and the best is
1549          *    individual, select current.
1550          *
1551          * 2. If current agg is individual and the best is not, keep best.
1552          *
1553          * 3. Therefore, current and best are both individual or both not
1554          *    individual, so:
1555          *
1556          * 3a. If current agg partner replied, and best agg partner did not,
1557          *     select current.
1558          *
1559          * 3b. If current agg partner did not reply and best agg partner
1560          *     did reply, keep best.
1561          *
1562          * 4.  Therefore, current and best both have partner replies or
1563          *     both do not, so perform selection policy:
1564          *
1565          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1566          *     select by bandwidth.
1567          *
1568          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1569          */
1570         if (!best)
1571                 return curr;
1572
1573         if (!curr->is_individual && best->is_individual)
1574                 return curr;
1575
1576         if (curr->is_individual && !best->is_individual)
1577                 return best;
1578
1579         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1580                 return curr;
1581
1582         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1583                 return best;
1584
1585         switch (__get_agg_selection_mode(curr->lag_ports)) {
1586         case BOND_AD_COUNT:
1587                 if (__agg_active_ports(curr) > __agg_active_ports(best))
1588                         return curr;
1589
1590                 if (__agg_active_ports(curr) < __agg_active_ports(best))
1591                         return best;
1592
1593                 /*FALLTHROUGH*/
1594         case BOND_AD_STABLE:
1595         case BOND_AD_BANDWIDTH:
1596                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1597                         return curr;
1598
1599                 break;
1600
1601         default:
1602                 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1603                                      curr->slave->bond->dev->name,
1604                                      __get_agg_selection_mode(curr->lag_ports));
1605                 break;
1606         }
1607
1608         return best;
1609 }
1610
1611 static int agg_device_up(const struct aggregator *agg)
1612 {
1613         struct port *port = agg->lag_ports;
1614
1615         if (!port)
1616                 return 0;
1617
1618         for (port = agg->lag_ports; port;
1619              port = port->next_port_in_aggregator) {
1620                 if (netif_running(port->slave->dev) &&
1621                     netif_carrier_ok(port->slave->dev))
1622                         return 1;
1623         }
1624
1625         return 0;
1626 }
1627
1628 /**
1629  * ad_agg_selection_logic - select an aggregation group for a team
1630  * @aggregator: the aggregator we're looking at
1631  * @update_slave_arr: Does slave array need update?
1632  *
1633  * It is assumed that only one aggregator may be selected for a team.
1634  *
1635  * The logic of this function is to select the aggregator according to
1636  * the ad_select policy:
1637  *
1638  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1639  * it, and to reselect the active aggregator only if the previous
1640  * aggregator has no more ports related to it.
1641  *
1642  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1643  * bandwidth, and reselect whenever a link state change takes place or the
1644  * set of slaves in the bond changes.
1645  *
1646  * BOND_AD_COUNT: select the aggregator with largest number of ports
1647  * (slaves), and reselect whenever a link state change takes place or the
1648  * set of slaves in the bond changes.
1649  *
1650  * FIXME: this function MUST be called with the first agg in the bond, or
1651  * __get_active_agg() won't work correctly. This function should be better
1652  * called with the bond itself, and retrieve the first agg from it.
1653  */
1654 static void ad_agg_selection_logic(struct aggregator *agg,
1655                                    bool *update_slave_arr)
1656 {
1657         struct aggregator *best, *active, *origin;
1658         struct bonding *bond = agg->slave->bond;
1659         struct list_head *iter;
1660         struct slave *slave;
1661         struct port *port;
1662
1663         rcu_read_lock();
1664         origin = agg;
1665         active = __get_active_agg(agg);
1666         best = (active && agg_device_up(active)) ? active : NULL;
1667
1668         bond_for_each_slave_rcu(bond, slave, iter) {
1669                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1670
1671                 agg->is_active = 0;
1672
1673                 if (__agg_active_ports(agg) && agg_device_up(agg))
1674                         best = ad_agg_selection_test(best, agg);
1675         }
1676
1677         if (best &&
1678             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1679                 /* For the STABLE policy, don't replace the old active
1680                  * aggregator if it's still active (it has an answering
1681                  * partner) or if both the best and active don't have an
1682                  * answering partner.
1683                  */
1684                 if (active && active->lag_ports &&
1685                     __agg_active_ports(active) &&
1686                     (__agg_has_partner(active) ||
1687                      (!__agg_has_partner(active) &&
1688                      !__agg_has_partner(best)))) {
1689                         if (!(!active->actor_oper_aggregator_key &&
1690                               best->actor_oper_aggregator_key)) {
1691                                 best = NULL;
1692                                 active->is_active = 1;
1693                         }
1694                 }
1695         }
1696
1697         if (best && (best == active)) {
1698                 best = NULL;
1699                 active->is_active = 1;
1700         }
1701
1702         /* if there is new best aggregator, activate it */
1703         if (best) {
1704                 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1705                            best->aggregator_identifier, best->num_of_ports,
1706                            best->actor_oper_aggregator_key,
1707                            best->partner_oper_aggregator_key,
1708                            best->is_individual, best->is_active);
1709                 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1710                            best->lag_ports, best->slave,
1711                            best->slave ? best->slave->dev->name : "NULL");
1712
1713                 bond_for_each_slave_rcu(bond, slave, iter) {
1714                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1715
1716                         netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1717                                    agg->aggregator_identifier, agg->num_of_ports,
1718                                    agg->actor_oper_aggregator_key,
1719                                    agg->partner_oper_aggregator_key,
1720                                    agg->is_individual, agg->is_active);
1721                 }
1722
1723                 /* check if any partner replys */
1724                 if (best->is_individual) {
1725                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1726                                              best->slave ?
1727                                              best->slave->bond->dev->name : "NULL");
1728                 }
1729
1730                 best->is_active = 1;
1731                 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1732                            best->aggregator_identifier);
1733                 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1734                            best->aggregator_identifier, best->num_of_ports,
1735                            best->actor_oper_aggregator_key,
1736                            best->partner_oper_aggregator_key,
1737                            best->is_individual, best->is_active);
1738
1739                 /* disable the ports that were related to the former
1740                  * active_aggregator
1741                  */
1742                 if (active) {
1743                         for (port = active->lag_ports; port;
1744                              port = port->next_port_in_aggregator) {
1745                                 __disable_port(port);
1746                         }
1747                 }
1748                 /* Slave array needs update. */
1749                 *update_slave_arr = true;
1750         }
1751
1752         /* if the selected aggregator is of join individuals
1753          * (partner_system is NULL), enable their ports
1754          */
1755         active = __get_active_agg(origin);
1756
1757         if (active) {
1758                 if (!__agg_has_partner(active)) {
1759                         for (port = active->lag_ports; port;
1760                              port = port->next_port_in_aggregator) {
1761                                 __enable_port(port);
1762                         }
1763                 }
1764         }
1765
1766         rcu_read_unlock();
1767
1768         bond_3ad_set_carrier(bond);
1769 }
1770
1771 /**
1772  * ad_clear_agg - clear a given aggregator's parameters
1773  * @aggregator: the aggregator we're looking at
1774  */
1775 static void ad_clear_agg(struct aggregator *aggregator)
1776 {
1777         if (aggregator) {
1778                 aggregator->is_individual = false;
1779                 aggregator->actor_admin_aggregator_key = 0;
1780                 aggregator->actor_oper_aggregator_key = 0;
1781                 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1782                 aggregator->partner_system_priority = 0;
1783                 aggregator->partner_oper_aggregator_key = 0;
1784                 aggregator->receive_state = 0;
1785                 aggregator->transmit_state = 0;
1786                 aggregator->lag_ports = NULL;
1787                 aggregator->is_active = 0;
1788                 aggregator->num_of_ports = 0;
1789                 pr_debug("LAG %d was cleared\n",
1790                          aggregator->aggregator_identifier);
1791         }
1792 }
1793
1794 /**
1795  * ad_initialize_agg - initialize a given aggregator's parameters
1796  * @aggregator: the aggregator we're looking at
1797  */
1798 static void ad_initialize_agg(struct aggregator *aggregator)
1799 {
1800         if (aggregator) {
1801                 ad_clear_agg(aggregator);
1802
1803                 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1804                 aggregator->aggregator_identifier = 0;
1805                 aggregator->slave = NULL;
1806         }
1807 }
1808
1809 /**
1810  * ad_initialize_port - initialize a given port's parameters
1811  * @aggregator: the aggregator we're looking at
1812  * @lacp_fast: boolean. whether fast periodic should be used
1813  */
1814 static void ad_initialize_port(struct port *port, int lacp_fast)
1815 {
1816         static const struct port_params tmpl = {
1817                 .system_priority = 0xffff,
1818                 .key             = 1,
1819                 .port_number     = 1,
1820                 .port_priority   = 0xff,
1821                 .port_state      = 1,
1822         };
1823         static const struct lacpdu lacpdu = {
1824                 .subtype                = 0x01,
1825                 .version_number = 0x01,
1826                 .tlv_type_actor_info = 0x01,
1827                 .actor_information_length = 0x14,
1828                 .tlv_type_partner_info = 0x02,
1829                 .partner_information_length = 0x14,
1830                 .tlv_type_collector_info = 0x03,
1831                 .collector_information_length = 0x10,
1832                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1833         };
1834
1835         if (port) {
1836                 port->actor_port_priority = 0xff;
1837                 port->actor_port_aggregator_identifier = 0;
1838                 port->ntt = false;
1839                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1840                                                AD_STATE_LACP_ACTIVITY;
1841                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1842                                                AD_STATE_LACP_ACTIVITY;
1843
1844                 if (lacp_fast)
1845                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1846
1847                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1848                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1849
1850                 port->is_enabled = true;
1851                 /* private parameters */
1852                 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1853                 port->sm_rx_state = 0;
1854                 port->sm_rx_timer_counter = 0;
1855                 port->sm_periodic_state = 0;
1856                 port->sm_periodic_timer_counter = 0;
1857                 port->sm_mux_state = 0;
1858                 port->sm_mux_timer_counter = 0;
1859                 port->sm_tx_state = 0;
1860                 port->aggregator = NULL;
1861                 port->next_port_in_aggregator = NULL;
1862                 port->transaction_id = 0;
1863
1864                 port->sm_churn_actor_timer_counter = 0;
1865                 port->sm_churn_actor_state = 0;
1866                 port->churn_actor_count = 0;
1867                 port->sm_churn_partner_timer_counter = 0;
1868                 port->sm_churn_partner_state = 0;
1869                 port->churn_partner_count = 0;
1870
1871                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1872         }
1873 }
1874
1875 /**
1876  * ad_enable_collecting_distributing - enable a port's transmit/receive
1877  * @port: the port we're looking at
1878  * @update_slave_arr: Does slave array need update?
1879  *
1880  * Enable @port if it's in an active aggregator
1881  */
1882 static void ad_enable_collecting_distributing(struct port *port,
1883                                               bool *update_slave_arr)
1884 {
1885         if (port->aggregator->is_active) {
1886                 pr_debug("Enabling port %d(LAG %d)\n",
1887                          port->actor_port_number,
1888                          port->aggregator->aggregator_identifier);
1889                 __enable_port(port);
1890                 /* Slave array needs update */
1891                 *update_slave_arr = true;
1892         }
1893 }
1894
1895 /**
1896  * ad_disable_collecting_distributing - disable a port's transmit/receive
1897  * @port: the port we're looking at
1898  * @update_slave_arr: Does slave array need update?
1899  */
1900 static void ad_disable_collecting_distributing(struct port *port,
1901                                                bool *update_slave_arr)
1902 {
1903         if (port->aggregator &&
1904             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1905                                &(null_mac_addr))) {
1906                 pr_debug("Disabling port %d(LAG %d)\n",
1907                          port->actor_port_number,
1908                          port->aggregator->aggregator_identifier);
1909                 __disable_port(port);
1910                 /* Slave array needs an update */
1911                 *update_slave_arr = true;
1912         }
1913 }
1914
1915 /**
1916  * ad_marker_info_received - handle receive of a Marker information frame
1917  * @marker_info: Marker info received
1918  * @port: the port we're looking at
1919  */
1920 static void ad_marker_info_received(struct bond_marker *marker_info,
1921         struct port *port)
1922 {
1923         struct bond_marker marker;
1924
1925         /* copy the received marker data to the response marker */
1926         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1927         /* change the marker subtype to marker response */
1928         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1929
1930         /* send the marker response */
1931         if (ad_marker_send(port, &marker) >= 0) {
1932                 pr_debug("Sent Marker Response on port %d\n",
1933                          port->actor_port_number);
1934         }
1935 }
1936
1937 /**
1938  * ad_marker_response_received - handle receive of a marker response frame
1939  * @marker: marker PDU received
1940  * @port: the port we're looking at
1941  *
1942  * This function does nothing since we decided not to implement send and handle
1943  * response for marker PDU's, in this stage, but only to respond to marker
1944  * information.
1945  */
1946 static void ad_marker_response_received(struct bond_marker *marker,
1947                                         struct port *port)
1948 {
1949         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1950 }
1951
1952 /* ========= AD exported functions to the main bonding code ========= */
1953
1954 /* Check aggregators status in team every T seconds */
1955 #define AD_AGGREGATOR_SELECTION_TIMER  8
1956
1957 /**
1958  * bond_3ad_initiate_agg_selection - initate aggregator selection
1959  * @bond: bonding struct
1960  *
1961  * Set the aggregation selection timer, to initiate an agg selection in
1962  * the very near future.  Called during first initialization, and during
1963  * any down to up transitions of the bond.
1964  */
1965 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1966 {
1967         BOND_AD_INFO(bond).agg_select_timer = timeout;
1968 }
1969
1970 /**
1971  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1972  * @bond: bonding struct to work on
1973  * @tick_resolution: tick duration (millisecond resolution)
1974  *
1975  * Can be called only after the mac address of the bond is set.
1976  */
1977 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1978 {
1979         /* check that the bond is not initialized yet */
1980         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1981                                 bond->dev->dev_addr)) {
1982
1983                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1984
1985                 BOND_AD_INFO(bond).system.sys_priority =
1986                         bond->params.ad_actor_sys_prio;
1987                 if (is_zero_ether_addr(bond->params.ad_actor_system))
1988                         BOND_AD_INFO(bond).system.sys_mac_addr =
1989                             *((struct mac_addr *)bond->dev->dev_addr);
1990                 else
1991                         BOND_AD_INFO(bond).system.sys_mac_addr =
1992                             *((struct mac_addr *)bond->params.ad_actor_system);
1993
1994                 /* initialize how many times this module is called in one
1995                  * second (should be about every 100ms)
1996                  */
1997                 ad_ticks_per_sec = tick_resolution;
1998
1999                 bond_3ad_initiate_agg_selection(bond,
2000                                                 AD_AGGREGATOR_SELECTION_TIMER *
2001                                                 ad_ticks_per_sec);
2002         }
2003 }
2004
2005 /**
2006  * bond_3ad_bind_slave - initialize a slave's port
2007  * @slave: slave struct to work on
2008  *
2009  * Returns:   0 on success
2010  *          < 0 on error
2011  */
2012 void bond_3ad_bind_slave(struct slave *slave)
2013 {
2014         struct bonding *bond = bond_get_bond_by_slave(slave);
2015         struct port *port;
2016         struct aggregator *aggregator;
2017
2018         /* check that the slave has not been initialized yet. */
2019         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2020
2021                 /* port initialization */
2022                 port = &(SLAVE_AD_INFO(slave)->port);
2023
2024                 ad_initialize_port(port, bond->params.lacp_fast);
2025
2026                 port->slave = slave;
2027                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2028                 /* key is determined according to the link speed, duplex and
2029                  * user key
2030                  */
2031                 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2032                 ad_update_actor_keys(port, false);
2033                 /* actor system is the bond's system */
2034                 __ad_actor_update_port(port);
2035                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2036                  * lacpdu's are sent in one second)
2037                  */
2038                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2039
2040                 __disable_port(port);
2041
2042                 /* aggregator initialization */
2043                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2044
2045                 ad_initialize_agg(aggregator);
2046
2047                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2048                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2049                 aggregator->slave = slave;
2050                 aggregator->is_active = 0;
2051                 aggregator->num_of_ports = 0;
2052         }
2053 }
2054
2055 /**
2056  * bond_3ad_unbind_slave - deinitialize a slave's port
2057  * @slave: slave struct to work on
2058  *
2059  * Search for the aggregator that is related to this port, remove the
2060  * aggregator and assign another aggregator for other port related to it
2061  * (if any), and remove the port.
2062  */
2063 void bond_3ad_unbind_slave(struct slave *slave)
2064 {
2065         struct port *port, *prev_port, *temp_port;
2066         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2067         int select_new_active_agg = 0;
2068         struct bonding *bond = slave->bond;
2069         struct slave *slave_iter;
2070         struct list_head *iter;
2071         bool dummy_slave_update; /* Ignore this value as caller updates array */
2072
2073         /* Sync against bond_3ad_state_machine_handler() */
2074         spin_lock_bh(&bond->mode_lock);
2075         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2076         port = &(SLAVE_AD_INFO(slave)->port);
2077
2078         /* if slave is null, the whole port is not initialized */
2079         if (!port->slave) {
2080                 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
2081                             slave->dev->name);
2082                 goto out;
2083         }
2084
2085         netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
2086                    aggregator->aggregator_identifier);
2087
2088         /* Tell the partner that this port is not suitable for aggregation */
2089         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2090         __update_lacpdu_from_port(port);
2091         ad_lacpdu_send(port);
2092
2093         /* check if this aggregator is occupied */
2094         if (aggregator->lag_ports) {
2095                 /* check if there are other ports related to this aggregator
2096                  * except the port related to this slave(thats ensure us that
2097                  * there is a reason to search for new aggregator, and that we
2098                  * will find one
2099                  */
2100                 if ((aggregator->lag_ports != port) ||
2101                     (aggregator->lag_ports->next_port_in_aggregator)) {
2102                         /* find new aggregator for the related port(s) */
2103                         bond_for_each_slave(bond, slave_iter, iter) {
2104                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2105                                 /* if the new aggregator is empty, or it is
2106                                  * connected to our port only
2107                                  */
2108                                 if (!new_aggregator->lag_ports ||
2109                                     ((new_aggregator->lag_ports == port) &&
2110                                      !new_aggregator->lag_ports->next_port_in_aggregator))
2111                                         break;
2112                         }
2113                         if (!slave_iter)
2114                                 new_aggregator = NULL;
2115
2116                         /* if new aggregator found, copy the aggregator's
2117                          * parameters and connect the related lag_ports to the
2118                          * new aggregator
2119                          */
2120                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2121                                 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2122                                            aggregator->aggregator_identifier,
2123                                            new_aggregator->aggregator_identifier);
2124
2125                                 if ((new_aggregator->lag_ports == port) &&
2126                                     new_aggregator->is_active) {
2127                                         netdev_info(bond->dev, "Removing an active aggregator\n");
2128                                          select_new_active_agg = 1;
2129                                 }
2130
2131                                 new_aggregator->is_individual = aggregator->is_individual;
2132                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2133                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2134                                 new_aggregator->partner_system = aggregator->partner_system;
2135                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2136                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2137                                 new_aggregator->receive_state = aggregator->receive_state;
2138                                 new_aggregator->transmit_state = aggregator->transmit_state;
2139                                 new_aggregator->lag_ports = aggregator->lag_ports;
2140                                 new_aggregator->is_active = aggregator->is_active;
2141                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2142
2143                                 /* update the information that is written on
2144                                  * the ports about the aggregator
2145                                  */
2146                                 for (temp_port = aggregator->lag_ports; temp_port;
2147                                      temp_port = temp_port->next_port_in_aggregator) {
2148                                         temp_port->aggregator = new_aggregator;
2149                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2150                                 }
2151
2152                                 ad_clear_agg(aggregator);
2153
2154                                 if (select_new_active_agg)
2155                                         ad_agg_selection_logic(__get_first_agg(port),
2156                                                                &dummy_slave_update);
2157                         } else {
2158                                 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2159                         }
2160                 } else {
2161                         /* in case that the only port related to this
2162                          * aggregator is the one we want to remove
2163                          */
2164                         select_new_active_agg = aggregator->is_active;
2165                         ad_clear_agg(aggregator);
2166                         if (select_new_active_agg) {
2167                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2168                                 /* select new active aggregator */
2169                                 temp_aggregator = __get_first_agg(port);
2170                                 if (temp_aggregator)
2171                                         ad_agg_selection_logic(temp_aggregator,
2172                                                                &dummy_slave_update);
2173                         }
2174                 }
2175         }
2176
2177         netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
2178
2179         /* find the aggregator that this port is connected to */
2180         bond_for_each_slave(bond, slave_iter, iter) {
2181                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2182                 prev_port = NULL;
2183                 /* search the port in the aggregator's related ports */
2184                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2185                      prev_port = temp_port,
2186                      temp_port = temp_port->next_port_in_aggregator) {
2187                         if (temp_port == port) {
2188                                 /* the aggregator found - detach the port from
2189                                  * this aggregator
2190                                  */
2191                                 if (prev_port)
2192                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2193                                 else
2194                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2195                                 temp_aggregator->num_of_ports--;
2196                                 if (__agg_active_ports(temp_aggregator) == 0) {
2197                                         select_new_active_agg = temp_aggregator->is_active;
2198                                         ad_clear_agg(temp_aggregator);
2199                                         if (select_new_active_agg) {
2200                                                 netdev_info(bond->dev, "Removing an active aggregator\n");
2201                                                 /* select new active aggregator */
2202                                                 ad_agg_selection_logic(__get_first_agg(port),
2203                                                                        &dummy_slave_update);
2204                                         }
2205                                 }
2206                                 break;
2207                         }
2208                 }
2209         }
2210         port->slave = NULL;
2211
2212 out:
2213         spin_unlock_bh(&bond->mode_lock);
2214 }
2215
2216 /**
2217  * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2218  * @bond: bonding struct to work on
2219  *
2220  * If an ad_actor setting gets changed we need to update the individual port
2221  * settings so the bond device will use the new values when it gets upped.
2222  */
2223 void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2224 {
2225         struct list_head *iter;
2226         struct slave *slave;
2227
2228         ASSERT_RTNL();
2229
2230         BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2231         if (is_zero_ether_addr(bond->params.ad_actor_system))
2232                 BOND_AD_INFO(bond).system.sys_mac_addr =
2233                     *((struct mac_addr *)bond->dev->dev_addr);
2234         else
2235                 BOND_AD_INFO(bond).system.sys_mac_addr =
2236                     *((struct mac_addr *)bond->params.ad_actor_system);
2237
2238         spin_lock_bh(&bond->mode_lock);
2239         bond_for_each_slave(bond, slave, iter) {
2240                 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2241
2242                 __ad_actor_update_port(port);
2243                 port->ntt = true;
2244         }
2245         spin_unlock_bh(&bond->mode_lock);
2246 }
2247
2248 /**
2249  * bond_3ad_state_machine_handler - handle state machines timeout
2250  * @bond: bonding struct to work on
2251  *
2252  * The state machine handling concept in this module is to check every tick
2253  * which state machine should operate any function. The execution order is
2254  * round robin, so when we have an interaction between state machines, the
2255  * reply of one to each other might be delayed until next tick.
2256  *
2257  * This function also complete the initialization when the agg_select_timer
2258  * times out, and it selects an aggregator for the ports that are yet not
2259  * related to any aggregator, and selects the active aggregator for a bond.
2260  */
2261 void bond_3ad_state_machine_handler(struct work_struct *work)
2262 {
2263         struct bonding *bond = container_of(work, struct bonding,
2264                                             ad_work.work);
2265         struct aggregator *aggregator;
2266         struct list_head *iter;
2267         struct slave *slave;
2268         struct port *port;
2269         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2270         bool update_slave_arr = false;
2271
2272         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2273          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2274          * concurrently due to incoming LACPDU as well.
2275          */
2276         spin_lock_bh(&bond->mode_lock);
2277         rcu_read_lock();
2278
2279         /* check if there are any slaves */
2280         if (!bond_has_slaves(bond))
2281                 goto re_arm;
2282
2283         /* check if agg_select_timer timer after initialize is timed out */
2284         if (BOND_AD_INFO(bond).agg_select_timer &&
2285             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2286                 slave = bond_first_slave_rcu(bond);
2287                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2288
2289                 /* select the active aggregator for the bond */
2290                 if (port) {
2291                         if (!port->slave) {
2292                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2293                                                      bond->dev->name);
2294                                 goto re_arm;
2295                         }
2296
2297                         aggregator = __get_first_agg(port);
2298                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2299                 }
2300                 bond_3ad_set_carrier(bond);
2301         }
2302
2303         /* for each port run the state machines */
2304         bond_for_each_slave_rcu(bond, slave, iter) {
2305                 port = &(SLAVE_AD_INFO(slave)->port);
2306                 if (!port->slave) {
2307                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2308                                             bond->dev->name);
2309                         goto re_arm;
2310                 }
2311
2312                 ad_rx_machine(NULL, port);
2313                 ad_periodic_machine(port);
2314                 ad_port_selection_logic(port, &update_slave_arr);
2315                 ad_mux_machine(port, &update_slave_arr);
2316                 ad_tx_machine(port);
2317                 ad_churn_machine(port);
2318
2319                 /* turn off the BEGIN bit, since we already handled it */
2320                 if (port->sm_vars & AD_PORT_BEGIN)
2321                         port->sm_vars &= ~AD_PORT_BEGIN;
2322         }
2323
2324 re_arm:
2325         bond_for_each_slave_rcu(bond, slave, iter) {
2326                 if (slave->should_notify) {
2327                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2328                         break;
2329                 }
2330         }
2331         rcu_read_unlock();
2332         spin_unlock_bh(&bond->mode_lock);
2333
2334         if (update_slave_arr)
2335                 bond_slave_arr_work_rearm(bond, 0);
2336
2337         if (should_notify_rtnl && rtnl_trylock()) {
2338                 bond_slave_state_notify(bond);
2339                 rtnl_unlock();
2340         }
2341         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2342 }
2343
2344 /**
2345  * bond_3ad_rx_indication - handle a received frame
2346  * @lacpdu: received lacpdu
2347  * @slave: slave struct to work on
2348  * @length: length of the data received
2349  *
2350  * It is assumed that frames that were sent on this NIC don't returned as new
2351  * received frames (loopback). Since only the payload is given to this
2352  * function, it check for loopback.
2353  */
2354 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2355                                   u16 length)
2356 {
2357         struct port *port;
2358         int ret = RX_HANDLER_ANOTHER;
2359
2360         if (length >= sizeof(struct lacpdu)) {
2361
2362                 port = &(SLAVE_AD_INFO(slave)->port);
2363
2364                 if (!port->slave) {
2365                         net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2366                                              slave->dev->name, slave->bond->dev->name);
2367                         return ret;
2368                 }
2369
2370                 switch (lacpdu->subtype) {
2371                 case AD_TYPE_LACPDU:
2372                         ret = RX_HANDLER_CONSUMED;
2373                         netdev_dbg(slave->bond->dev,
2374                                    "Received LACPDU on port %d slave %s\n",
2375                                    port->actor_port_number,
2376                                    slave->dev->name);
2377                         /* Protect against concurrent state machines */
2378                         spin_lock(&slave->bond->mode_lock);
2379                         ad_rx_machine(lacpdu, port);
2380                         spin_unlock(&slave->bond->mode_lock);
2381                         break;
2382
2383                 case AD_TYPE_MARKER:
2384                         ret = RX_HANDLER_CONSUMED;
2385                         /* No need to convert fields to Little Endian since we
2386                          * don't use the marker's fields.
2387                          */
2388
2389                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2390                         case AD_MARKER_INFORMATION_SUBTYPE:
2391                                 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2392                                            port->actor_port_number);
2393                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2394                                 break;
2395
2396                         case AD_MARKER_RESPONSE_SUBTYPE:
2397                                 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2398                                            port->actor_port_number);
2399                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2400                                 break;
2401
2402                         default:
2403                                 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2404                                            port->actor_port_number);
2405                         }
2406                 }
2407         }
2408         return ret;
2409 }
2410
2411 /**
2412  * ad_update_actor_keys - Update the oper / admin keys for a port based on
2413  * its current speed and duplex settings.
2414  *
2415  * @port: the port we'are looking at
2416  * @reset: Boolean to just reset the speed and the duplex part of the key
2417  *
2418  * The logic to change the oper / admin keys is:
2419  * (a) A full duplex port can participate in LACP with partner.
2420  * (b) When the speed is changed, LACP need to be reinitiated.
2421  */
2422 static void ad_update_actor_keys(struct port *port, bool reset)
2423 {
2424         u8 duplex = 0;
2425         u16 ospeed = 0, speed = 0;
2426         u16 old_oper_key = port->actor_oper_port_key;
2427
2428         port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2429         if (!reset) {
2430                 speed = __get_link_speed(port);
2431                 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2432                 duplex = __get_duplex(port);
2433                 port->actor_admin_port_key |= (speed << 1) | duplex;
2434         }
2435         port->actor_oper_port_key = port->actor_admin_port_key;
2436
2437         if (old_oper_key != port->actor_oper_port_key) {
2438                 /* Only 'duplex' port participates in LACP */
2439                 if (duplex)
2440                         port->sm_vars |= AD_PORT_LACP_ENABLED;
2441                 else
2442                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2443
2444                 if (!reset) {
2445                         if (!speed) {
2446                                 netdev_err(port->slave->dev,
2447                                            "speed changed to 0 for port %s",
2448                                            port->slave->dev->name);
2449                         } else if (duplex && ospeed != speed) {
2450                                 /* Speed change restarts LACP state-machine */
2451                                 port->sm_vars |= AD_PORT_BEGIN;
2452                         }
2453                 }
2454         }
2455 }
2456
2457 /**
2458  * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2459  * change indication
2460  *
2461  * @slave: slave struct to work on
2462  *
2463  * Handle reselection of aggregator (if needed) for this port.
2464  */
2465 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2466 {
2467         struct port *port;
2468
2469         port = &(SLAVE_AD_INFO(slave)->port);
2470
2471         /* if slave is null, the whole port is not initialized */
2472         if (!port->slave) {
2473                 netdev_warn(slave->bond->dev,
2474                             "speed/duplex changed for uninitialized port %s\n",
2475                             slave->dev->name);
2476                 return;
2477         }
2478
2479         spin_lock_bh(&slave->bond->mode_lock);
2480         ad_update_actor_keys(port, false);
2481         spin_unlock_bh(&slave->bond->mode_lock);
2482         netdev_dbg(slave->bond->dev, "Port %d slave %s changed speed/duplex\n",
2483                    port->actor_port_number, slave->dev->name);
2484 }
2485
2486 /**
2487  * bond_3ad_handle_link_change - handle a slave's link status change indication
2488  * @slave: slave struct to work on
2489  * @status: whether the link is now up or down
2490  *
2491  * Handle reselection of aggregator (if needed) for this port.
2492  */
2493 void bond_3ad_handle_link_change(struct slave *slave, char link)
2494 {
2495         struct aggregator *agg;
2496         struct port *port;
2497         bool dummy;
2498
2499         port = &(SLAVE_AD_INFO(slave)->port);
2500
2501         /* if slave is null, the whole port is not initialized */
2502         if (!port->slave) {
2503                 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2504                             slave->dev->name);
2505                 return;
2506         }
2507
2508         spin_lock_bh(&slave->bond->mode_lock);
2509         /* on link down we are zeroing duplex and speed since
2510          * some of the adaptors(ce1000.lan) report full duplex/speed
2511          * instead of N/A(duplex) / 0(speed).
2512          *
2513          * on link up we are forcing recheck on the duplex and speed since
2514          * some of he adaptors(ce1000.lan) report.
2515          */
2516         if (link == BOND_LINK_UP) {
2517                 port->is_enabled = true;
2518                 ad_update_actor_keys(port, false);
2519         } else {
2520                 /* link has failed */
2521                 port->is_enabled = false;
2522                 ad_update_actor_keys(port, true);
2523         }
2524         agg = __get_first_agg(port);
2525         ad_agg_selection_logic(agg, &dummy);
2526
2527         spin_unlock_bh(&slave->bond->mode_lock);
2528
2529         netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2530                    port->actor_port_number,
2531                    link == BOND_LINK_UP ? "UP" : "DOWN");
2532
2533         /* RTNL is held and mode_lock is released so it's safe
2534          * to update slave_array here.
2535          */
2536         bond_update_slave_arr(slave->bond, NULL);
2537 }
2538
2539 /**
2540  * bond_3ad_set_carrier - set link state for bonding master
2541  * @bond - bonding structure
2542  *
2543  * if we have an active aggregator, we're up, if not, we're down.
2544  * Presumes that we cannot have an active aggregator if there are
2545  * no slaves with link up.
2546  *
2547  * This behavior complies with IEEE 802.3 section 43.3.9.
2548  *
2549  * Called by bond_set_carrier(). Return zero if carrier state does not
2550  * change, nonzero if it does.
2551  */
2552 int bond_3ad_set_carrier(struct bonding *bond)
2553 {
2554         struct aggregator *active;
2555         struct slave *first_slave;
2556         int ret = 1;
2557
2558         rcu_read_lock();
2559         first_slave = bond_first_slave_rcu(bond);
2560         if (!first_slave) {
2561                 ret = 0;
2562                 goto out;
2563         }
2564         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2565         if (active) {
2566                 /* are enough slaves available to consider link up? */
2567                 if (__agg_active_ports(active) < bond->params.min_links) {
2568                         if (netif_carrier_ok(bond->dev)) {
2569                                 netif_carrier_off(bond->dev);
2570                                 goto out;
2571                         }
2572                 } else if (!netif_carrier_ok(bond->dev)) {
2573                         netif_carrier_on(bond->dev);
2574                         goto out;
2575                 }
2576         } else if (netif_carrier_ok(bond->dev)) {
2577                 netif_carrier_off(bond->dev);
2578         }
2579 out:
2580         rcu_read_unlock();
2581         return ret;
2582 }
2583
2584 /**
2585  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2586  * @bond: bonding struct to work on
2587  * @ad_info: ad_info struct to fill with the bond's info
2588  *
2589  * Returns:   0 on success
2590  *          < 0 on error
2591  */
2592 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2593                                    struct ad_info *ad_info)
2594 {
2595         struct aggregator *aggregator = NULL;
2596         struct list_head *iter;
2597         struct slave *slave;
2598         struct port *port;
2599
2600         bond_for_each_slave_rcu(bond, slave, iter) {
2601                 port = &(SLAVE_AD_INFO(slave)->port);
2602                 if (port->aggregator && port->aggregator->is_active) {
2603                         aggregator = port->aggregator;
2604                         break;
2605                 }
2606         }
2607
2608         if (!aggregator)
2609                 return -1;
2610
2611         ad_info->aggregator_id = aggregator->aggregator_identifier;
2612         ad_info->ports = __agg_active_ports(aggregator);
2613         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2614         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2615         ether_addr_copy(ad_info->partner_system,
2616                         aggregator->partner_system.mac_addr_value);
2617         return 0;
2618 }
2619
2620 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2621 {
2622         int ret;
2623
2624         rcu_read_lock();
2625         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2626         rcu_read_unlock();
2627
2628         return ret;
2629 }
2630
2631 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2632                          struct slave *slave)
2633 {
2634         struct lacpdu *lacpdu, _lacpdu;
2635
2636         if (skb->protocol != PKT_TYPE_LACPDU)
2637                 return RX_HANDLER_ANOTHER;
2638
2639         if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2640                 return RX_HANDLER_ANOTHER;
2641
2642         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2643         if (!lacpdu)
2644                 return RX_HANDLER_ANOTHER;
2645
2646         return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2647 }
2648
2649 /**
2650  * bond_3ad_update_lacp_rate - change the lacp rate
2651  * @bond - bonding struct
2652  *
2653  * When modify lacp_rate parameter via sysfs,
2654  * update actor_oper_port_state of each port.
2655  *
2656  * Hold bond->mode_lock,
2657  * so we can modify port->actor_oper_port_state,
2658  * no matter bond is up or down.
2659  */
2660 void bond_3ad_update_lacp_rate(struct bonding *bond)
2661 {
2662         struct port *port = NULL;
2663         struct list_head *iter;
2664         struct slave *slave;
2665         int lacp_fast;
2666
2667         lacp_fast = bond->params.lacp_fast;
2668         spin_lock_bh(&bond->mode_lock);
2669         bond_for_each_slave(bond, slave, iter) {
2670                 port = &(SLAVE_AD_INFO(slave)->port);
2671                 if (lacp_fast)
2672                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2673                 else
2674                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2675         }
2676         spin_unlock_bh(&bond->mode_lock);
2677 }