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 "bonding.h"
  33 #include "bond_3ad.h"
  34
  35 /* General definitions */
  36 #define AD_SHORT_TIMEOUT           1
  37 #define AD_LONG_TIMEOUT            0
  38 #define AD_STANDBY                 0x2
  39 #define AD_MAX_TX_IN_SECOND        3
  40 #define AD_COLLECTOR_MAX_DELAY     0
  41
  42 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  43 #define AD_FAST_PERIODIC_TIME      1
  44 #define AD_SLOW_PERIODIC_TIME      30
  45 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  46 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  47 #define AD_CHURN_DETECTION_TIME    60
  48 #define AD_AGGREGATE_WAIT_TIME     2
  49
  50 /* Port state definitions (43.4.2.2 in the 802.3ad standard) */
  51 #define AD_STATE_LACP_ACTIVITY   0x1
  52 #define AD_STATE_LACP_TIMEOUT    0x2
  53 #define AD_STATE_AGGREGATION     0x4
  54 #define AD_STATE_SYNCHRONIZATION 0x8
  55 #define AD_STATE_COLLECTING      0x10
  56 #define AD_STATE_DISTRIBUTING    0x20
  57 #define AD_STATE_DEFAULTED       0x40
  58 #define AD_STATE_EXPIRED         0x80
  59
  60 /* Port Variables definitions used by the State Machines (43.4.7 in the
  61  * 802.3ad standard)
  62  */
  63 #define AD_PORT_BEGIN           0x1
  64 #define AD_PORT_LACP_ENABLED    0x2
  65 #define AD_PORT_ACTOR_CHURN     0x4
  66 #define AD_PORT_PARTNER_CHURN   0x8
  67 #define AD_PORT_READY           0x10
  68 #define AD_PORT_READY_N         0x20
  69 #define AD_PORT_MATCHED         0x40
  70 #define AD_PORT_STANDBY         0x80
  71 #define AD_PORT_SELECTED        0x100
  72 #define AD_PORT_MOVED           0x200
  73
  74 /* Port Key definitions
  75  * key is determined according to the link speed, duplex and
  76  * user key (which is yet not supported)
  77  * --------------------------------------------------------------
  78  * Port key :   | User key      | Speed         | Duplex        |
  79  * --------------------------------------------------------------
  80  * 16             6               1               0
  81  */
  82 #define  AD_DUPLEX_KEY_BITS    0x1
  83 #define  AD_SPEED_KEY_BITS     0x3E
  84 #define  AD_USER_KEY_BITS      0xFFC0
  85
  86 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  87 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  88 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  89 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  90 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  91
  92 /* compare MAC addresses */
  93 #define MAC_ADDRESS_EQUAL(A, B) \
  94         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
  95
  96 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
  97 static u16 ad_ticks_per_sec;
  98 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  99
 100 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 101
 102 /* ================= main 802.3ad protocol functions ================== */
 103 static int ad_lacpdu_send(struct port *port);
 104 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 105 static void ad_mux_machine(struct port *port);
 106 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 107 static void ad_tx_machine(struct port *port);
 108 static void ad_periodic_machine(struct port *port);
 109 static void ad_port_selection_logic(struct port *port);
 110 static void ad_agg_selection_logic(struct aggregator *aggregator);
 111 static void ad_clear_agg(struct aggregator *aggregator);
 112 static void ad_initialize_agg(struct aggregator *aggregator);
 113 static void ad_initialize_port(struct port *port, int lacp_fast);
 114 static void ad_enable_collecting_distributing(struct port *port);
 115 static void ad_disable_collecting_distributing(struct port *port);
 116 static void ad_marker_info_received(struct bond_marker *marker_info,
 117                                     struct port *port);
 118 static void ad_marker_response_received(struct bond_marker *marker,
 119                                         struct port *port);
 120
 121
 122 /* ================= api to bonding and kernel code ================== */
 123
 124 /**
 125  * __get_bond_by_port - get the port's bonding struct
 126  * @port: the port we're looking at
 127  *
 128  * Return @port's bonding struct, or %NULL if it can't be found.
 129  */
 130 static inline struct bonding *__get_bond_by_port(struct port *port)
 131 {
 132         if (port->slave == NULL)
 133                 return NULL;
 134
 135         return bond_get_bond_by_slave(port->slave);
 136 }
 137
 138 /**
 139  * __get_first_agg - get the first aggregator in the bond
 140  * @bond: the bond we're looking at
 141  *
 142  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 143  * found.
 144  * The caller must hold RCU or RTNL lock.
 145  */
 146 static inline struct aggregator *__get_first_agg(struct port *port)
 147 {
 148         struct bonding *bond = __get_bond_by_port(port);
 149         struct slave *first_slave;
 150         struct aggregator *agg;
 151
 152         /* If there's no bond for this port, or bond has no slaves */
 153         if (bond == NULL)
 154                 return NULL;
 155
 156         rcu_read_lock();
 157         first_slave = bond_first_slave_rcu(bond);
 158         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 159         rcu_read_unlock();
 160
 161         return agg;
 162 }
 163
 164 /**
 165  * __agg_has_partner - see if we have a partner
 166  * @agg: the agregator we're looking at
 167  *
 168  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 169  * address for the partner). Return 0 if not.
 170  */
 171 static inline int __agg_has_partner(struct aggregator *agg)
 172 {
 173         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 174 }
 175
 176 /**
 177  * __disable_port - disable the port's slave
 178  * @port: the port we're looking at
 179  */
 180 static inline void __disable_port(struct port *port)
 181 {
 182         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 183 }
 184
 185 /**
 186  * __enable_port - enable the port's slave, if it's up
 187  * @port: the port we're looking at
 188  */
 189 static inline void __enable_port(struct port *port)
 190 {
 191         struct slave *slave = port->slave;
 192
 193         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 194                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 195 }
 196
 197 /**
 198  * __port_is_enabled - check if the port's slave is in active state
 199  * @port: the port we're looking at
 200  */
 201 static inline int __port_is_enabled(struct port *port)
 202 {
 203         return bond_is_active_slave(port->slave);
 204 }
 205
 206 /**
 207  * __get_agg_selection_mode - get the aggregator selection mode
 208  * @port: the port we're looking at
 209  *
 210  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 211  */
 212 static inline u32 __get_agg_selection_mode(struct port *port)
 213 {
 214         struct bonding *bond = __get_bond_by_port(port);
 215
 216         if (bond == NULL)
 217                 return BOND_AD_STABLE;
 218
 219         return bond->params.ad_select;
 220 }
 221
 222 /**
 223  * __check_agg_selection_timer - check if the selection timer has expired
 224  * @port: the port we're looking at
 225  */
 226 static inline int __check_agg_selection_timer(struct port *port)
 227 {
 228         struct bonding *bond = __get_bond_by_port(port);
 229
 230         if (bond == NULL)
 231                 return 0;
 232
 233         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 234 }
 235
 236 /**
 237  * __get_link_speed - get a port's speed
 238  * @port: the port we're looking at
 239  *
 240  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 241  *     0,
 242  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 243  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 244  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 245  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 246  */
 247 static u16 __get_link_speed(struct port *port)
 248 {
 249         struct slave *slave = port->slave;
 250         u16 speed;
 251
 252         /* this if covers only a special case: when the configuration starts
 253          * with link down, it sets the speed to 0.
 254          * This is done in spite of the fact that the e100 driver reports 0
 255          * to be compatible with MVT in the future.
 256          */
 257         if (slave->link != BOND_LINK_UP)
 258                 speed = 0;
 259         else {
 260                 switch (slave->speed) {
 261                 case SPEED_10:
 262                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 263                         break;
 264
 265                 case SPEED_100:
 266                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 267                         break;
 268
 269                 case SPEED_1000:
 270                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 271                         break;
 272
 273                 case SPEED_10000:
 274                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 275                         break;
 276
 277                 default:
 278                         /* unknown speed value from ethtool. shouldn't happen */
 279                         speed = 0;
 280                         break;
 281                 }
 282         }
 283
 284         netdev_dbg(slave->bond->dev, "Port %d Received link speed %d update from adapter\n",
 285                    port->actor_port_number, speed);
 286         return speed;
 287 }
 288
 289 /**
 290  * __get_duplex - get a port's duplex
 291  * @port: the port we're looking at
 292  *
 293  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 294  *     0x01 if in full duplex
 295  *     0x00 otherwise
 296  */
 297 static u8 __get_duplex(struct port *port)
 298 {
 299         struct slave *slave = port->slave;
 300         u8 retval;
 301
 302         /* handling a special case: when the configuration starts with
 303          * link down, it sets the duplex to 0.
 304          */
 305         if (slave->link != BOND_LINK_UP) {
 306                 retval = 0x0;
 307         } else {
 308                 switch (slave->duplex) {
 309                 case DUPLEX_FULL:
 310                         retval = 0x1;
 311                         netdev_dbg(slave->bond->dev, "Port %d Received status full duplex update from adapter\n",
 312                                    port->actor_port_number);
 313                         break;
 314                 case DUPLEX_HALF:
 315                 default:
 316                         retval = 0x0;
 317                         netdev_dbg(slave->bond->dev, "Port %d Received status NOT full duplex update from adapter\n",
 318                                    port->actor_port_number);
 319                         break;
 320                 }
 321         }
 322         return retval;
 323 }
 324
 325 /* Conversions */
 326
 327 /**
 328  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 329  * @timer_type: which timer to operate
 330  * @par: timer parameter. see below
 331  *
 332  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 333  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 334  *                                                   %SLOW_PERIODIC_TIME.
 335  */
 336 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 337 {
 338         u16 retval = 0; /* to silence the compiler */
 339
 340         switch (timer_type) {
 341         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 342                 if (par)
 343                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 344                 else
 345                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 346                 break;
 347         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 348                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 349                 break;
 350         case AD_PERIODIC_TIMER:         /* for periodic machine */
 351                 retval = (par*ad_ticks_per_sec); /* long timeout */
 352                 break;
 353         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 354                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 355                 break;
 356         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 357                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 358                 break;
 359         }
 360
 361         return retval;
 362 }
 363
 364
 365 /* ================= ad_rx_machine helper functions ================== */
 366
 367 /**
 368  * __choose_matched - update a port's matched variable from a received lacpdu
 369  * @lacpdu: the lacpdu we've received
 370  * @port: the port we're looking at
 371  *
 372  * Update the value of the matched variable, using parameter values from a
 373  * newly received lacpdu. Parameter values for the partner carried in the
 374  * received PDU are compared with the corresponding operational parameter
 375  * values for the actor. Matched is set to TRUE if all of these parameters
 376  * match and the PDU parameter partner_state.aggregation has the same value as
 377  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 378  * in the aggregation. Matched is also set to TRUE if the value of
 379  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 380  * an individual link and lacp will actively maintain the link. Otherwise,
 381  * matched is set to FALSE. LACP is considered to be actively maintaining the
 382  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 383  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 384  * partner_state.lacp_activity variables are TRUE.
 385  *
 386  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 387  * used here to implement the language from 802.3ad 43.4.9 that requires
 388  * recordPDU to "match" the LACPDU parameters to the stored values.
 389  */
 390 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 391 {
 392         /* check if all parameters are alike
 393          * or this is individual link(aggregation == FALSE)
 394          * then update the state machine Matched variable.
 395          */
 396         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 397              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 398              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 399              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 400              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 401              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 402             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 403                 ) {
 404                 port->sm_vars |= AD_PORT_MATCHED;
 405         } else {
 406                 port->sm_vars &= ~AD_PORT_MATCHED;
 407         }
 408 }
 409
 410 /**
 411  * __record_pdu - record parameters from a received lacpdu
 412  * @lacpdu: the lacpdu we've received
 413  * @port: the port we're looking at
 414  *
 415  * Record the parameter values for the Actor carried in a received lacpdu as
 416  * the current partner operational parameter values and sets
 417  * actor_oper_port_state.defaulted to FALSE.
 418  */
 419 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 420 {
 421         if (lacpdu && port) {
 422                 struct port_params *partner = &port->partner_oper;
 423
 424                 __choose_matched(lacpdu, port);
 425                 /* record the new parameter values for the partner
 426                  * operational
 427                  */
 428                 partner->port_number = ntohs(lacpdu->actor_port);
 429                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 430                 partner->system = lacpdu->actor_system;
 431                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 432                 partner->key = ntohs(lacpdu->actor_key);
 433                 partner->port_state = lacpdu->actor_state;
 434
 435                 /* set actor_oper_port_state.defaulted to FALSE */
 436                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 437
 438                 /* set the partner sync. to on if the partner is sync,
 439                  * and the port is matched
 440                  */
 441                 if ((port->sm_vars & AD_PORT_MATCHED)
 442                     && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
 443                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 444                 else
 445                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 446         }
 447 }
 448
 449 /**
 450  * __record_default - record default parameters
 451  * @port: the port we're looking at
 452  *
 453  * This function records the default parameter values for the partner carried
 454  * in the Partner Admin parameters as the current partner operational parameter
 455  * values and sets actor_oper_port_state.defaulted to TRUE.
 456  */
 457 static void __record_default(struct port *port)
 458 {
 459         if (port) {
 460                 /* record the partner admin parameters */
 461                 memcpy(&port->partner_oper, &port->partner_admin,
 462                        sizeof(struct port_params));
 463
 464                 /* set actor_oper_port_state.defaulted to true */
 465                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 466         }
 467 }
 468
 469 /**
 470  * __update_selected - update a port's Selected variable from a received lacpdu
 471  * @lacpdu: the lacpdu we've received
 472  * @port: the port we're looking at
 473  *
 474  * Update the value of the selected variable, using parameter values from a
 475  * newly received lacpdu. The parameter values for the Actor carried in the
 476  * received PDU are compared with the corresponding operational parameter
 477  * values for the ports partner. If one or more of the comparisons shows that
 478  * the value(s) received in the PDU differ from the current operational values,
 479  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 480  * set to out_of_sync. Otherwise, selected remains unchanged.
 481  */
 482 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 483 {
 484         if (lacpdu && port) {
 485                 const struct port_params *partner = &port->partner_oper;
 486
 487                 /* check if any parameter is different then
 488                  * update the state machine selected variable.
 489                  */
 490                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 491                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 492                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 493                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 494                     ntohs(lacpdu->actor_key) != partner->key ||
 495                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 496                         port->sm_vars &= ~AD_PORT_SELECTED;
 497                 }
 498         }
 499 }
 500
 501 /**
 502  * __update_default_selected - update a port's Selected variable from Partner
 503  * @port: the port we're looking at
 504  *
 505  * This function updates the value of the selected variable, using the partner
 506  * administrative parameter values. The administrative values are compared with
 507  * the corresponding operational parameter values for the partner. If one or
 508  * more of the comparisons shows that the administrative value(s) differ from
 509  * the current operational values, then Selected is set to FALSE and
 510  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 511  * Selected remains unchanged.
 512  */
 513 static void __update_default_selected(struct port *port)
 514 {
 515         if (port) {
 516                 const struct port_params *admin = &port->partner_admin;
 517                 const struct port_params *oper = &port->partner_oper;
 518
 519                 /* check if any parameter is different then
 520                  * update the state machine selected variable.
 521                  */
 522                 if (admin->port_number != oper->port_number ||
 523                     admin->port_priority != oper->port_priority ||
 524                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 525                     admin->system_priority != oper->system_priority ||
 526                     admin->key != oper->key ||
 527                     (admin->port_state & AD_STATE_AGGREGATION)
 528                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 529                         port->sm_vars &= ~AD_PORT_SELECTED;
 530                 }
 531         }
 532 }
 533
 534 /**
 535  * __update_ntt - update a port's ntt variable from a received lacpdu
 536  * @lacpdu: the lacpdu we've received
 537  * @port: the port we're looking at
 538  *
 539  * Updates the value of the ntt variable, using parameter values from a newly
 540  * received lacpdu. The parameter values for the partner carried in the
 541  * received PDU are compared with the corresponding operational parameter
 542  * values for the Actor. If one or more of the comparisons shows that the
 543  * value(s) received in the PDU differ from the current operational values,
 544  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 545  */
 546 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 547 {
 548         /* validate lacpdu and port */
 549         if (lacpdu && port) {
 550                 /* check if any parameter is different then
 551                  * update the port->ntt.
 552                  */
 553                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 554                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 555                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 556                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 557                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 558                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 559                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 560                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 561                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 562                    ) {
 563                         port->ntt = true;
 564                 }
 565         }
 566 }
 567
 568 /**
 569  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 570  * @aggregator: the aggregator we're looking at
 571  *
 572  */
 573 static int __agg_ports_are_ready(struct aggregator *aggregator)
 574 {
 575         struct port *port;
 576         int retval = 1;
 577
 578         if (aggregator) {
 579                 /* scan all ports in this aggregator to verfy if they are
 580                  * all ready.
 581                  */
 582                 for (port = aggregator->lag_ports;
 583                      port;
 584                      port = port->next_port_in_aggregator) {
 585                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 586                                 retval = 0;
 587                                 break;
 588                         }
 589                 }
 590         }
 591
 592         return retval;
 593 }
 594
 595 /**
 596  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 597  * @aggregator: the aggregator we're looking at
 598  * @val: Should the ports' ready bit be set on or off
 599  *
 600  */
 601 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 602 {
 603         struct port *port;
 604
 605         for (port = aggregator->lag_ports; port;
 606              port = port->next_port_in_aggregator) {
 607                 if (val)
 608                         port->sm_vars |= AD_PORT_READY;
 609                 else
 610                         port->sm_vars &= ~AD_PORT_READY;
 611         }
 612 }
 613
 614 /**
 615  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 616  * @aggregator: the aggregator we're looking at
 617  *
 618  */
 619 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 620 {
 621         u32 bandwidth = 0;
 622
 623         if (aggregator->num_of_ports) {
 624                 switch (__get_link_speed(aggregator->lag_ports)) {
 625                 case AD_LINK_SPEED_BITMASK_1MBPS:
 626                         bandwidth = aggregator->num_of_ports;
 627                         break;
 628                 case AD_LINK_SPEED_BITMASK_10MBPS:
 629                         bandwidth = aggregator->num_of_ports * 10;
 630                         break;
 631                 case AD_LINK_SPEED_BITMASK_100MBPS:
 632                         bandwidth = aggregator->num_of_ports * 100;
 633                         break;
 634                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 635                         bandwidth = aggregator->num_of_ports * 1000;
 636                         break;
 637                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 638                         bandwidth = aggregator->num_of_ports * 10000;
 639                         break;
 640                 default:
 641                         bandwidth = 0; /* to silence the compiler */
 642                 }
 643         }
 644         return bandwidth;
 645 }
 646
 647 /**
 648  * __get_active_agg - get the current active aggregator
 649  * @aggregator: the aggregator we're looking at
 650  *
 651  * Caller must hold RCU lock.
 652  */
 653 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 654 {
 655         struct bonding *bond = aggregator->slave->bond;
 656         struct list_head *iter;
 657         struct slave *slave;
 658
 659         bond_for_each_slave_rcu(bond, slave, iter)
 660                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 661                         return &(SLAVE_AD_INFO(slave)->aggregator);
 662
 663         return NULL;
 664 }
 665
 666 /**
 667  * __update_lacpdu_from_port - update a port's lacpdu fields
 668  * @port: the port we're looking at
 669  */
 670 static inline void __update_lacpdu_from_port(struct port *port)
 671 {
 672         struct lacpdu *lacpdu = &port->lacpdu;
 673         const struct port_params *partner = &port->partner_oper;
 674
 675         /* update current actual Actor parameters
 676          * lacpdu->subtype                   initialized
 677          * lacpdu->version_number            initialized
 678          * lacpdu->tlv_type_actor_info       initialized
 679          * lacpdu->actor_information_length  initialized
 680          */
 681
 682         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 683         lacpdu->actor_system = port->actor_system;
 684         lacpdu->actor_key = htons(port->actor_oper_port_key);
 685         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 686         lacpdu->actor_port = htons(port->actor_port_number);
 687         lacpdu->actor_state = port->actor_oper_port_state;
 688
 689         /* lacpdu->reserved_3_1              initialized
 690          * lacpdu->tlv_type_partner_info     initialized
 691          * lacpdu->partner_information_length initialized
 692          */
 693
 694         lacpdu->partner_system_priority = htons(partner->system_priority);
 695         lacpdu->partner_system = partner->system;
 696         lacpdu->partner_key = htons(partner->key);
 697         lacpdu->partner_port_priority = htons(partner->port_priority);
 698         lacpdu->partner_port = htons(partner->port_number);
 699         lacpdu->partner_state = partner->port_state;
 700
 701         /* lacpdu->reserved_3_2              initialized
 702          * lacpdu->tlv_type_collector_info   initialized
 703          * lacpdu->collector_information_length initialized
 704          * collector_max_delay                initialized
 705          * reserved_12[12]                   initialized
 706          * tlv_type_terminator               initialized
 707          * terminator_length                 initialized
 708          * reserved_50[50]                   initialized
 709          */
 710 }
 711
 712 /* ================= main 802.3ad protocol code ========================= */
 713
 714 /**
 715  * ad_lacpdu_send - send out a lacpdu packet on a given port
 716  * @port: the port we're looking at
 717  *
 718  * Returns:   0 on success
 719  *          < 0 on error
 720  */
 721 static int ad_lacpdu_send(struct port *port)
 722 {
 723         struct slave *slave = port->slave;
 724         struct sk_buff *skb;
 725         struct lacpdu_header *lacpdu_header;
 726         int length = sizeof(struct lacpdu_header);
 727
 728         skb = dev_alloc_skb(length);
 729         if (!skb)
 730                 return -ENOMEM;
 731
 732         skb->dev = slave->dev;
 733         skb_reset_mac_header(skb);
 734         skb->network_header = skb->mac_header + ETH_HLEN;
 735         skb->protocol = PKT_TYPE_LACPDU;
 736         skb->priority = TC_PRIO_CONTROL;
 737
 738         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 739
 740         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 741         /* Note: source address is set to be the member's PERMANENT address,
 742          * because we use it to identify loopback lacpdus in receive.
 743          */
 744         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 745         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 746
 747         lacpdu_header->lacpdu = port->lacpdu;
 748
 749         dev_queue_xmit(skb);
 750
 751         return 0;
 752 }
 753
 754 /**
 755  * ad_marker_send - send marker information/response on a given port
 756  * @port: the port we're looking at
 757  * @marker: marker data to send
 758  *
 759  * Returns:   0 on success
 760  *          < 0 on error
 761  */
 762 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 763 {
 764         struct slave *slave = port->slave;
 765         struct sk_buff *skb;
 766         struct bond_marker_header *marker_header;
 767         int length = sizeof(struct bond_marker_header);
 768
 769         skb = dev_alloc_skb(length + 16);
 770         if (!skb)
 771                 return -ENOMEM;
 772
 773         skb_reserve(skb, 16);
 774
 775         skb->dev = slave->dev;
 776         skb_reset_mac_header(skb);
 777         skb->network_header = skb->mac_header + ETH_HLEN;
 778         skb->protocol = PKT_TYPE_LACPDU;
 779
 780         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 781
 782         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 783         /* Note: source address is set to be the member's PERMANENT address,
 784          * because we use it to identify loopback MARKERs in receive.
 785          */
 786         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 787         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 788
 789         marker_header->marker = *marker;
 790
 791         dev_queue_xmit(skb);
 792
 793         return 0;
 794 }
 795
 796 /**
 797  * ad_mux_machine - handle a port's mux state machine
 798  * @port: the port we're looking at
 799  */
 800 static void ad_mux_machine(struct port *port)
 801 {
 802         mux_states_t last_state;
 803
 804         /* keep current State Machine state to compare later if it was
 805          * changed
 806          */
 807         last_state = port->sm_mux_state;
 808
 809         if (port->sm_vars & AD_PORT_BEGIN) {
 810                 port->sm_mux_state = AD_MUX_DETACHED;
 811         } else {
 812                 switch (port->sm_mux_state) {
 813                 case AD_MUX_DETACHED:
 814                         if ((port->sm_vars & AD_PORT_SELECTED)
 815                             || (port->sm_vars & AD_PORT_STANDBY))
 816                                 /* if SELECTED or STANDBY */
 817                                 port->sm_mux_state = AD_MUX_WAITING;
 818                         break;
 819                 case AD_MUX_WAITING:
 820                         /* if SELECTED == FALSE return to DETACH state */
 821                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 822                                 port->sm_vars &= ~AD_PORT_READY_N;
 823                                 /* in order to withhold the Selection Logic to
 824                                  * check all ports READY_N value every callback
 825                                  * cycle to update ready variable, we check
 826                                  * READY_N and update READY here
 827                                  */
 828                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 829                                 port->sm_mux_state = AD_MUX_DETACHED;
 830                                 break;
 831                         }
 832
 833                         /* check if the wait_while_timer expired */
 834                         if (port->sm_mux_timer_counter
 835                             && !(--port->sm_mux_timer_counter))
 836                                 port->sm_vars |= AD_PORT_READY_N;
 837
 838                         /* in order to withhold the selection logic to check
 839                          * all ports READY_N value every callback cycle to
 840                          * update ready variable, we check READY_N and update
 841                          * READY here
 842                          */
 843                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 844
 845                         /* if the wait_while_timer expired, and the port is
 846                          * in READY state, move to ATTACHED state
 847                          */
 848                         if ((port->sm_vars & AD_PORT_READY)
 849                             && !port->sm_mux_timer_counter)
 850                                 port->sm_mux_state = AD_MUX_ATTACHED;
 851                         break;
 852                 case AD_MUX_ATTACHED:
 853                         /* check also if agg_select_timer expired (so the
 854                          * edable port will take place only after this timer)
 855                          */
 856                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 857                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 858                             !__check_agg_selection_timer(port)) {
 859                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;
 860                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 861                                    (port->sm_vars & AD_PORT_STANDBY)) {
 862                                 /* if UNSELECTED or STANDBY */
 863                                 port->sm_vars &= ~AD_PORT_READY_N;
 864                                 /* in order to withhold the selection logic to
 865                                  * check all ports READY_N value every callback
 866                                  * cycle to update ready variable, we check
 867                                  * READY_N and update READY here
 868                                  */
 869                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 870                                 port->sm_mux_state = AD_MUX_DETACHED;
 871                         }
 872                         break;
 873                 case AD_MUX_COLLECTING_DISTRIBUTING:
 874                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
 875                             (port->sm_vars & AD_PORT_STANDBY) ||
 876                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)) {
 877                                 port->sm_mux_state = AD_MUX_ATTACHED;
 878                         } else {
 879                                 /* if port state hasn't changed make
 880                                  * sure that a collecting distributing
 881                                  * port in an active aggregator is enabled
 882                                  */
 883                                 if (port->aggregator &&
 884                                     port->aggregator->is_active &&
 885                                     !__port_is_enabled(port)) {
 886
 887                                         __enable_port(port);
 888                                 }
 889                         }
 890                         break;
 891                 default:
 892                         break;
 893                 }
 894         }
 895
 896         /* check if the state machine was changed */
 897         if (port->sm_mux_state != last_state) {
 898                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
 899                          port->actor_port_number, last_state,
 900                          port->sm_mux_state);
 901                 switch (port->sm_mux_state) {
 902                 case AD_MUX_DETACHED:
 903                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 904                         ad_disable_collecting_distributing(port);
 905                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 906                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 907                         port->ntt = true;
 908                         break;
 909                 case AD_MUX_WAITING:
 910                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 911                         break;
 912                 case AD_MUX_ATTACHED:
 913                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 914                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 915                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 916                         ad_disable_collecting_distributing(port);
 917                         port->ntt = true;
 918                         break;
 919                 case AD_MUX_COLLECTING_DISTRIBUTING:
 920                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 921                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 922                         ad_enable_collecting_distributing(port);
 923                         port->ntt = true;
 924                         break;
 925                 default:
 926                         break;
 927                 }
 928         }
 929 }
 930
 931 /**
 932  * ad_rx_machine - handle a port's rx State Machine
 933  * @lacpdu: the lacpdu we've received
 934  * @port: the port we're looking at
 935  *
 936  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
 937  * CURRENT. If timer expired set the state machine in the proper state.
 938  * In other cases, this function checks if we need to switch to other state.
 939  */
 940 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
 941 {
 942         rx_states_t last_state;
 943
 944         /* keep current State Machine state to compare later if it was
 945          * changed
 946          */
 947         last_state = port->sm_rx_state;
 948
 949         /* check if state machine should change state */
 950
 951         /* first, check if port was reinitialized */
 952         if (port->sm_vars & AD_PORT_BEGIN)
 953                 port->sm_rx_state = AD_RX_INITIALIZE;
 954         /* check if port is not enabled */
 955         else if (!(port->sm_vars & AD_PORT_BEGIN)
 956                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
 957                 port->sm_rx_state = AD_RX_PORT_DISABLED;
 958         /* check if new lacpdu arrived */
 959         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
 960                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
 961                  (port->sm_rx_state == AD_RX_CURRENT))) {
 962                 port->sm_rx_timer_counter = 0;
 963                 port->sm_rx_state = AD_RX_CURRENT;
 964         } else {
 965                 /* if timer is on, and if it is expired */
 966                 if (port->sm_rx_timer_counter &&
 967                     !(--port->sm_rx_timer_counter)) {
 968                         switch (port->sm_rx_state) {
 969                         case AD_RX_EXPIRED:
 970                                 port->sm_rx_state = AD_RX_DEFAULTED;
 971                                 break;
 972                         case AD_RX_CURRENT:
 973                                 port->sm_rx_state = AD_RX_EXPIRED;
 974                                 break;
 975                         default:
 976                                 break;
 977                         }
 978                 } else {
 979                         /* if no lacpdu arrived and no timer is on */
 980                         switch (port->sm_rx_state) {
 981                         case AD_RX_PORT_DISABLED:
 982                                 if (port->sm_vars & AD_PORT_MOVED)
 983                                         port->sm_rx_state = AD_RX_INITIALIZE;
 984                                 else if (port->is_enabled
 985                                          && (port->sm_vars
 986                                              & AD_PORT_LACP_ENABLED))
 987                                         port->sm_rx_state = AD_RX_EXPIRED;
 988                                 else if (port->is_enabled
 989                                          && ((port->sm_vars
 990                                               & AD_PORT_LACP_ENABLED) == 0))
 991                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
 992                                 break;
 993                         default:
 994                                 break;
 995
 996                         }
 997                 }
 998         }
 999
1000         /* check if the State machine was changed or new lacpdu arrived */
1001         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1002                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1003                          port->actor_port_number, last_state,
1004                          port->sm_rx_state);
1005                 switch (port->sm_rx_state) {
1006                 case AD_RX_INITIALIZE:
1007                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1008                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1009                         else
1010                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1011                         port->sm_vars &= ~AD_PORT_SELECTED;
1012                         __record_default(port);
1013                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1014                         port->sm_vars &= ~AD_PORT_MOVED;
1015                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1016
1017                         /* Fall Through */
1018                 case AD_RX_PORT_DISABLED:
1019                         port->sm_vars &= ~AD_PORT_MATCHED;
1020                         break;
1021                 case AD_RX_LACP_DISABLED:
1022                         port->sm_vars &= ~AD_PORT_SELECTED;
1023                         __record_default(port);
1024                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1025                         port->sm_vars |= AD_PORT_MATCHED;
1026                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1027                         break;
1028                 case AD_RX_EXPIRED:
1029                         /* Reset of the Synchronization flag (Standard 43.4.12)
1030                          * This reset cause to disable this port in the
1031                          * COLLECTING_DISTRIBUTING state of the mux machine in
1032                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1033                          * the port.
1034                          */
1035                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1036                         port->sm_vars &= ~AD_PORT_MATCHED;
1037                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1038                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1039                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1040                         break;
1041                 case AD_RX_DEFAULTED:
1042                         __update_default_selected(port);
1043                         __record_default(port);
1044                         port->sm_vars |= AD_PORT_MATCHED;
1045                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1046                         break;
1047                 case AD_RX_CURRENT:
1048                         /* detect loopback situation */
1049                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1050                                               &(port->actor_system))) {
1051                                 netdev_err(port->slave->bond->dev, "An illegal loopback occurred on adapter (%s)\n"
1052                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1053                                        port->slave->dev->name);
1054                                 return;
1055                         }
1056                         __update_selected(lacpdu, port);
1057                         __update_ntt(lacpdu, port);
1058                         __record_pdu(lacpdu, port);
1059                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1060                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1061                         break;
1062                 default:
1063                         break;
1064                 }
1065         }
1066 }
1067
1068 /**
1069  * ad_tx_machine - handle a port's tx state machine
1070  * @port: the port we're looking at
1071  */
1072 static void ad_tx_machine(struct port *port)
1073 {
1074         /* check if tx timer expired, to verify that we do not send more than
1075          * 3 packets per second
1076          */
1077         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1078                 /* check if there is something to send */
1079                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1080                         __update_lacpdu_from_port(port);
1081
1082                         if (ad_lacpdu_send(port) >= 0) {
1083                                 pr_debug("Sent LACPDU on port %d\n",
1084                                          port->actor_port_number);
1085
1086                                 /* mark ntt as false, so it will not be sent
1087                                  * again until demanded
1088                                  */
1089                                 port->ntt = false;
1090                         }
1091                 }
1092                 /* restart tx timer(to verify that we will not exceed
1093                  * AD_MAX_TX_IN_SECOND
1094                  */
1095                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1096         }
1097 }
1098
1099 /**
1100  * ad_periodic_machine - handle a port's periodic state machine
1101  * @port: the port we're looking at
1102  *
1103  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1104  */
1105 static void ad_periodic_machine(struct port *port)
1106 {
1107         periodic_states_t last_state;
1108
1109         /* keep current state machine state to compare later if it was changed */
1110         last_state = port->sm_periodic_state;
1111
1112         /* check if port was reinitialized */
1113         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1114             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1115            ) {
1116                 port->sm_periodic_state = AD_NO_PERIODIC;
1117         }
1118         /* check if state machine should change state */
1119         else if (port->sm_periodic_timer_counter) {
1120                 /* check if periodic state machine expired */
1121                 if (!(--port->sm_periodic_timer_counter)) {
1122                         /* if expired then do tx */
1123                         port->sm_periodic_state = AD_PERIODIC_TX;
1124                 } else {
1125                         /* If not expired, check if there is some new timeout
1126                          * parameter from the partner state
1127                          */
1128                         switch (port->sm_periodic_state) {
1129                         case AD_FAST_PERIODIC:
1130                                 if (!(port->partner_oper.port_state
1131                                       & AD_STATE_LACP_TIMEOUT))
1132                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1133                                 break;
1134                         case AD_SLOW_PERIODIC:
1135                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1136                                         port->sm_periodic_timer_counter = 0;
1137                                         port->sm_periodic_state = AD_PERIODIC_TX;
1138                                 }
1139                                 break;
1140                         default:
1141                                 break;
1142                         }
1143                 }
1144         } else {
1145                 switch (port->sm_periodic_state) {
1146                 case AD_NO_PERIODIC:
1147                         port->sm_periodic_state = AD_FAST_PERIODIC;
1148                         break;
1149                 case AD_PERIODIC_TX:
1150                         if (!(port->partner_oper.port_state &
1151                             AD_STATE_LACP_TIMEOUT))
1152                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1153                         else
1154                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1155                         break;
1156                 default:
1157                         break;
1158                 }
1159         }
1160
1161         /* check if the state machine was changed */
1162         if (port->sm_periodic_state != last_state) {
1163                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1164                          port->actor_port_number, last_state,
1165                          port->sm_periodic_state);
1166                 switch (port->sm_periodic_state) {
1167                 case AD_NO_PERIODIC:
1168                         port->sm_periodic_timer_counter = 0;
1169                         break;
1170                 case AD_FAST_PERIODIC:
1171                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1172                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1173                         break;
1174                 case AD_SLOW_PERIODIC:
1175                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1176                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1177                         break;
1178                 case AD_PERIODIC_TX:
1179                         port->ntt = true;
1180                         break;
1181                 default:
1182                         break;
1183                 }
1184         }
1185 }
1186
1187 /**
1188  * ad_port_selection_logic - select aggregation groups
1189  * @port: the port we're looking at
1190  *
1191  * Select aggregation groups, and assign each port for it's aggregetor. The
1192  * selection logic is called in the inititalization (after all the handshkes),
1193  * and after every lacpdu receive (if selected is off).
1194  */
1195 static void ad_port_selection_logic(struct port *port)
1196 {
1197         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1198         struct port *last_port = NULL, *curr_port;
1199         struct list_head *iter;
1200         struct bonding *bond;
1201         struct slave *slave;
1202         int found = 0;
1203
1204         /* if the port is already Selected, do nothing */
1205         if (port->sm_vars & AD_PORT_SELECTED)
1206                 return;
1207
1208         bond = __get_bond_by_port(port);
1209
1210         /* if the port is connected to other aggregator, detach it */
1211         if (port->aggregator) {
1212                 /* detach the port from its former aggregator */
1213                 temp_aggregator = port->aggregator;
1214                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1215                      last_port = curr_port,
1216                      curr_port = curr_port->next_port_in_aggregator) {
1217                         if (curr_port == port) {
1218                                 temp_aggregator->num_of_ports--;
1219                                 /* if it is the first port attached to the
1220                                  * aggregator
1221                                  */
1222                                 if (!last_port) {
1223                                         temp_aggregator->lag_ports =
1224                                                 port->next_port_in_aggregator;
1225                                 } else {
1226                                         /* not the first port attached to the
1227                                          * aggregator
1228                                          */
1229                                         last_port->next_port_in_aggregator =
1230                                                 port->next_port_in_aggregator;
1231                                 }
1232
1233                                 /* clear the port's relations to this
1234                                  * aggregator
1235                                  */
1236                                 port->aggregator = NULL;
1237                                 port->next_port_in_aggregator = NULL;
1238                                 port->actor_port_aggregator_identifier = 0;
1239
1240                                 netdev_dbg(bond->dev, "Port %d left LAG %d\n",
1241                                            port->actor_port_number,
1242                                            temp_aggregator->aggregator_identifier);
1243                                 /* if the aggregator is empty, clear its
1244                                  * parameters, and set it ready to be attached
1245                                  */
1246                                 if (!temp_aggregator->lag_ports)
1247                                         ad_clear_agg(temp_aggregator);
1248                                 break;
1249                         }
1250                 }
1251                 if (!curr_port) {
1252                         /* meaning: the port was related to an aggregator
1253                          * but was not on the aggregator port list
1254                          */
1255                         net_warn_ratelimited("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1256                                              port->slave->bond->dev->name,
1257                                              port->actor_port_number,
1258                                              port->slave->dev->name,
1259                                              port->aggregator->aggregator_identifier);
1260                 }
1261         }
1262         /* search on all aggregators for a suitable aggregator for this port */
1263         bond_for_each_slave(bond, slave, iter) {
1264                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1265
1266                 /* keep a free aggregator for later use(if needed) */
1267                 if (!aggregator->lag_ports) {
1268                         if (!free_aggregator)
1269                                 free_aggregator = aggregator;
1270                         continue;
1271                 }
1272                 /* check if current aggregator suits us */
1273                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1274                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1275                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1276                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1277                     ) &&
1278                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1279                       !aggregator->is_individual)  /* but is not individual OR */
1280                     )
1281                    ) {
1282                         /* attach to the founded aggregator */
1283                         port->aggregator = aggregator;
1284                         port->actor_port_aggregator_identifier =
1285                                 port->aggregator->aggregator_identifier;
1286                         port->next_port_in_aggregator = aggregator->lag_ports;
1287                         port->aggregator->num_of_ports++;
1288                         aggregator->lag_ports = port;
1289                         netdev_dbg(bond->dev, "Port %d joined LAG %d(existing LAG)\n",
1290                                    port->actor_port_number,
1291                                    port->aggregator->aggregator_identifier);
1292
1293                         /* mark this port as selected */
1294                         port->sm_vars |= AD_PORT_SELECTED;
1295                         found = 1;
1296                         break;
1297                 }
1298         }
1299
1300         /* the port couldn't find an aggregator - attach it to a new
1301          * aggregator
1302          */
1303         if (!found) {
1304                 if (free_aggregator) {
1305                         /* assign port a new aggregator */
1306                         port->aggregator = free_aggregator;
1307                         port->actor_port_aggregator_identifier =
1308                                 port->aggregator->aggregator_identifier;
1309
1310                         /* update the new aggregator's parameters
1311                          * if port was responsed from the end-user
1312                          */
1313                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1314                                 /* if port is full duplex */
1315                                 port->aggregator->is_individual = false;
1316                         else
1317                                 port->aggregator->is_individual = true;
1318
1319                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1320                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1321                         port->aggregator->partner_system =
1322                                 port->partner_oper.system;
1323                         port->aggregator->partner_system_priority =
1324                                 port->partner_oper.system_priority;
1325                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1326                         port->aggregator->receive_state = 1;
1327                         port->aggregator->transmit_state = 1;
1328                         port->aggregator->lag_ports = port;
1329                         port->aggregator->num_of_ports++;
1330
1331                         /* mark this port as selected */
1332                         port->sm_vars |= AD_PORT_SELECTED;
1333
1334                         netdev_dbg(bond->dev, "Port %d joined LAG %d(new LAG)\n",
1335                                    port->actor_port_number,
1336                                    port->aggregator->aggregator_identifier);
1337                 } else {
1338                         netdev_err(bond->dev, "Port %d (on %s) did not find a suitable aggregator\n",
1339                                port->actor_port_number, port->slave->dev->name);
1340                 }
1341         }
1342         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1343          * in all aggregator's ports, else set ready=FALSE in all
1344          * aggregator's ports
1345          */
1346         __set_agg_ports_ready(port->aggregator,
1347                               __agg_ports_are_ready(port->aggregator));
1348
1349         aggregator = __get_first_agg(port);
1350         ad_agg_selection_logic(aggregator);
1351 }
1352
1353 /* Decide if "agg" is a better choice for the new active aggregator that
1354  * the current best, according to the ad_select policy.
1355  */
1356 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1357                                                 struct aggregator *curr)
1358 {
1359         /* 0. If no best, select current.
1360          *
1361          * 1. If the current agg is not individual, and the best is
1362          *    individual, select current.
1363          *
1364          * 2. If current agg is individual and the best is not, keep best.
1365          *
1366          * 3. Therefore, current and best are both individual or both not
1367          *    individual, so:
1368          *
1369          * 3a. If current agg partner replied, and best agg partner did not,
1370          *     select current.
1371          *
1372          * 3b. If current agg partner did not reply and best agg partner
1373          *     did reply, keep best.
1374          *
1375          * 4.  Therefore, current and best both have partner replies or
1376          *     both do not, so perform selection policy:
1377          *
1378          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1379          *     select by bandwidth.
1380          *
1381          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1382          */
1383         if (!best)
1384                 return curr;
1385
1386         if (!curr->is_individual && best->is_individual)
1387                 return curr;
1388
1389         if (curr->is_individual && !best->is_individual)
1390                 return best;
1391
1392         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1393                 return curr;
1394
1395         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1396                 return best;
1397
1398         switch (__get_agg_selection_mode(curr->lag_ports)) {
1399         case BOND_AD_COUNT:
1400                 if (curr->num_of_ports > best->num_of_ports)
1401                         return curr;
1402
1403                 if (curr->num_of_ports < best->num_of_ports)
1404                         return best;
1405
1406                 /*FALLTHROUGH*/
1407         case BOND_AD_STABLE:
1408         case BOND_AD_BANDWIDTH:
1409                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1410                         return curr;
1411
1412                 break;
1413
1414         default:
1415                 net_warn_ratelimited("%s: Impossible agg select mode %d\n",
1416                                      curr->slave->bond->dev->name,
1417                                      __get_agg_selection_mode(curr->lag_ports));
1418                 break;
1419         }
1420
1421         return best;
1422 }
1423
1424 static int agg_device_up(const struct aggregator *agg)
1425 {
1426         struct port *port = agg->lag_ports;
1427
1428         if (!port)
1429                 return 0;
1430
1431         return netif_running(port->slave->dev) &&
1432                netif_carrier_ok(port->slave->dev);
1433 }
1434
1435 /**
1436  * ad_agg_selection_logic - select an aggregation group for a team
1437  * @aggregator: the aggregator we're looking at
1438  *
1439  * It is assumed that only one aggregator may be selected for a team.
1440  *
1441  * The logic of this function is to select the aggregator according to
1442  * the ad_select policy:
1443  *
1444  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1445  * it, and to reselect the active aggregator only if the previous
1446  * aggregator has no more ports related to it.
1447  *
1448  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1449  * bandwidth, and reselect whenever a link state change takes place or the
1450  * set of slaves in the bond changes.
1451  *
1452  * BOND_AD_COUNT: select the aggregator with largest number of ports
1453  * (slaves), and reselect whenever a link state change takes place or the
1454  * set of slaves in the bond changes.
1455  *
1456  * FIXME: this function MUST be called with the first agg in the bond, or
1457  * __get_active_agg() won't work correctly. This function should be better
1458  * called with the bond itself, and retrieve the first agg from it.
1459  */
1460 static void ad_agg_selection_logic(struct aggregator *agg)
1461 {
1462         struct aggregator *best, *active, *origin;
1463         struct bonding *bond = agg->slave->bond;
1464         struct list_head *iter;
1465         struct slave *slave;
1466         struct port *port;
1467
1468         rcu_read_lock();
1469         origin = agg;
1470         active = __get_active_agg(agg);
1471         best = (active && agg_device_up(active)) ? active : NULL;
1472
1473         bond_for_each_slave_rcu(bond, slave, iter) {
1474                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1475
1476                 agg->is_active = 0;
1477
1478                 if (agg->num_of_ports && agg_device_up(agg))
1479                         best = ad_agg_selection_test(best, agg);
1480         }
1481
1482         if (best &&
1483             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1484                 /* For the STABLE policy, don't replace the old active
1485                  * aggregator if it's still active (it has an answering
1486                  * partner) or if both the best and active don't have an
1487                  * answering partner.
1488                  */
1489                 if (active && active->lag_ports &&
1490                     active->lag_ports->is_enabled &&
1491                     (__agg_has_partner(active) ||
1492                      (!__agg_has_partner(active) &&
1493                      !__agg_has_partner(best)))) {
1494                         if (!(!active->actor_oper_aggregator_key &&
1495                               best->actor_oper_aggregator_key)) {
1496                                 best = NULL;
1497                                 active->is_active = 1;
1498                         }
1499                 }
1500         }
1501
1502         if (best && (best == active)) {
1503                 best = NULL;
1504                 active->is_active = 1;
1505         }
1506
1507         /* if there is new best aggregator, activate it */
1508         if (best) {
1509                 netdev_dbg(bond->dev, "best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1510                            best->aggregator_identifier, best->num_of_ports,
1511                            best->actor_oper_aggregator_key,
1512                            best->partner_oper_aggregator_key,
1513                            best->is_individual, best->is_active);
1514                 netdev_dbg(bond->dev, "best ports %p slave %p %s\n",
1515                            best->lag_ports, best->slave,
1516                            best->slave ? best->slave->dev->name : "NULL");
1517
1518                 bond_for_each_slave_rcu(bond, slave, iter) {
1519                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1520
1521                         netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1522                                    agg->aggregator_identifier, agg->num_of_ports,
1523                                    agg->actor_oper_aggregator_key,
1524                                    agg->partner_oper_aggregator_key,
1525                                    agg->is_individual, agg->is_active);
1526                 }
1527
1528                 /* check if any partner replys */
1529                 if (best->is_individual) {
1530                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1531                                              best->slave ?
1532                                              best->slave->bond->dev->name : "NULL");
1533                 }
1534
1535                 best->is_active = 1;
1536                 netdev_dbg(bond->dev, "LAG %d chosen as the active LAG\n",
1537                            best->aggregator_identifier);
1538                 netdev_dbg(bond->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1539                            best->aggregator_identifier, best->num_of_ports,
1540                            best->actor_oper_aggregator_key,
1541                            best->partner_oper_aggregator_key,
1542                            best->is_individual, best->is_active);
1543
1544                 /* disable the ports that were related to the former
1545                  * active_aggregator
1546                  */
1547                 if (active) {
1548                         for (port = active->lag_ports; port;
1549                              port = port->next_port_in_aggregator) {
1550                                 __disable_port(port);
1551                         }
1552                 }
1553         }
1554
1555         /* if the selected aggregator is of join individuals
1556          * (partner_system is NULL), enable their ports
1557          */
1558         active = __get_active_agg(origin);
1559
1560         if (active) {
1561                 if (!__agg_has_partner(active)) {
1562                         for (port = active->lag_ports; port;
1563                              port = port->next_port_in_aggregator) {
1564                                 __enable_port(port);
1565                         }
1566                 }
1567         }
1568
1569         rcu_read_unlock();
1570
1571         bond_3ad_set_carrier(bond);
1572 }
1573
1574 /**
1575  * ad_clear_agg - clear a given aggregator's parameters
1576  * @aggregator: the aggregator we're looking at
1577  */
1578 static void ad_clear_agg(struct aggregator *aggregator)
1579 {
1580         if (aggregator) {
1581                 aggregator->is_individual = false;
1582                 aggregator->actor_admin_aggregator_key = 0;
1583                 aggregator->actor_oper_aggregator_key = 0;
1584                 aggregator->partner_system = null_mac_addr;
1585                 aggregator->partner_system_priority = 0;
1586                 aggregator->partner_oper_aggregator_key = 0;
1587                 aggregator->receive_state = 0;
1588                 aggregator->transmit_state = 0;
1589                 aggregator->lag_ports = NULL;
1590                 aggregator->is_active = 0;
1591                 aggregator->num_of_ports = 0;
1592                 pr_debug("LAG %d was cleared\n",
1593                          aggregator->aggregator_identifier);
1594         }
1595 }
1596
1597 /**
1598  * ad_initialize_agg - initialize a given aggregator's parameters
1599  * @aggregator: the aggregator we're looking at
1600  */
1601 static void ad_initialize_agg(struct aggregator *aggregator)
1602 {
1603         if (aggregator) {
1604                 ad_clear_agg(aggregator);
1605
1606                 aggregator->aggregator_mac_address = null_mac_addr;
1607                 aggregator->aggregator_identifier = 0;
1608                 aggregator->slave = NULL;
1609         }
1610 }
1611
1612 /**
1613  * ad_initialize_port - initialize a given port's parameters
1614  * @aggregator: the aggregator we're looking at
1615  * @lacp_fast: boolean. whether fast periodic should be used
1616  */
1617 static void ad_initialize_port(struct port *port, int lacp_fast)
1618 {
1619         static const struct port_params tmpl = {
1620                 .system_priority = 0xffff,
1621                 .key             = 1,
1622                 .port_number     = 1,
1623                 .port_priority   = 0xff,
1624                 .port_state      = 1,
1625         };
1626         static const struct lacpdu lacpdu = {
1627                 .subtype                = 0x01,
1628                 .version_number = 0x01,
1629                 .tlv_type_actor_info = 0x01,
1630                 .actor_information_length = 0x14,
1631                 .tlv_type_partner_info = 0x02,
1632                 .partner_information_length = 0x14,
1633                 .tlv_type_collector_info = 0x03,
1634                 .collector_information_length = 0x10,
1635                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1636         };
1637
1638         if (port) {
1639                 port->actor_port_number = 1;
1640                 port->actor_port_priority = 0xff;
1641                 port->actor_system = null_mac_addr;
1642                 port->actor_system_priority = 0xffff;
1643                 port->actor_port_aggregator_identifier = 0;
1644                 port->ntt = false;
1645                 port->actor_admin_port_key = 1;
1646                 port->actor_oper_port_key  = 1;
1647                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1648                                                AD_STATE_LACP_ACTIVITY;
1649                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1650                                                AD_STATE_LACP_ACTIVITY;
1651
1652                 if (lacp_fast)
1653                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1654
1655                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1656                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1657
1658                 port->is_enabled = true;
1659                 /* private parameters */
1660                 port->sm_vars = 0x3;
1661                 port->sm_rx_state = 0;
1662                 port->sm_rx_timer_counter = 0;
1663                 port->sm_periodic_state = 0;
1664                 port->sm_periodic_timer_counter = 0;
1665                 port->sm_mux_state = 0;
1666                 port->sm_mux_timer_counter = 0;
1667                 port->sm_tx_state = 0;
1668                 port->sm_tx_timer_counter = 0;
1669                 port->slave = NULL;
1670                 port->aggregator = NULL;
1671                 port->next_port_in_aggregator = NULL;
1672                 port->transaction_id = 0;
1673
1674                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1675         }
1676 }
1677
1678 /**
1679  * ad_enable_collecting_distributing - enable a port's transmit/receive
1680  * @port: the port we're looking at
1681  *
1682  * Enable @port if it's in an active aggregator
1683  */
1684 static void ad_enable_collecting_distributing(struct port *port)
1685 {
1686         if (port->aggregator->is_active) {
1687                 pr_debug("Enabling port %d(LAG %d)\n",
1688                          port->actor_port_number,
1689                          port->aggregator->aggregator_identifier);
1690                 __enable_port(port);
1691         }
1692 }
1693
1694 /**
1695  * ad_disable_collecting_distributing - disable a port's transmit/receive
1696  * @port: the port we're looking at
1697  */
1698 static void ad_disable_collecting_distributing(struct port *port)
1699 {
1700         if (port->aggregator &&
1701             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1702                                &(null_mac_addr))) {
1703                 pr_debug("Disabling port %d(LAG %d)\n",
1704                          port->actor_port_number,
1705                          port->aggregator->aggregator_identifier);
1706                 __disable_port(port);
1707         }
1708 }
1709
1710 /**
1711  * ad_marker_info_received - handle receive of a Marker information frame
1712  * @marker_info: Marker info received
1713  * @port: the port we're looking at
1714  */
1715 static void ad_marker_info_received(struct bond_marker *marker_info,
1716         struct port *port)
1717 {
1718         struct bond_marker marker;
1719
1720         /* copy the received marker data to the response marker */
1721         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1722         /* change the marker subtype to marker response */
1723         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1724
1725         /* send the marker response */
1726         if (ad_marker_send(port, &marker) >= 0) {
1727                 pr_debug("Sent Marker Response on port %d\n",
1728                          port->actor_port_number);
1729         }
1730 }
1731
1732 /**
1733  * ad_marker_response_received - handle receive of a marker response frame
1734  * @marker: marker PDU received
1735  * @port: the port we're looking at
1736  *
1737  * This function does nothing since we decided not to implement send and handle
1738  * response for marker PDU's, in this stage, but only to respond to marker
1739  * information.
1740  */
1741 static void ad_marker_response_received(struct bond_marker *marker,
1742                                         struct port *port)
1743 {
1744         marker = NULL;
1745         port = NULL;
1746         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1747 }
1748
1749 /* ========= AD exported functions to the main bonding code ========= */
1750
1751 /* Check aggregators status in team every T seconds */
1752 #define AD_AGGREGATOR_SELECTION_TIMER  8
1753
1754 /**
1755  * bond_3ad_initiate_agg_selection - initate aggregator selection
1756  * @bond: bonding struct
1757  *
1758  * Set the aggregation selection timer, to initiate an agg selection in
1759  * the very near future.  Called during first initialization, and during
1760  * any down to up transitions of the bond.
1761  */
1762 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1763 {
1764         BOND_AD_INFO(bond).agg_select_timer = timeout;
1765 }
1766
1767 /**
1768  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1769  * @bond: bonding struct to work on
1770  * @tick_resolution: tick duration (millisecond resolution)
1771  *
1772  * Can be called only after the mac address of the bond is set.
1773  */
1774 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1775 {
1776         /* check that the bond is not initialized yet */
1777         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1778                                 bond->dev->dev_addr)) {
1779
1780                 BOND_AD_INFO(bond).aggregator_identifier = 0;
1781
1782                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1783                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1784
1785                 /* initialize how many times this module is called in one
1786                  * second (should be about every 100ms)
1787                  */
1788                 ad_ticks_per_sec = tick_resolution;
1789
1790                 bond_3ad_initiate_agg_selection(bond,
1791                                                 AD_AGGREGATOR_SELECTION_TIMER *
1792                                                 ad_ticks_per_sec);
1793         }
1794 }
1795
1796 /**
1797  * bond_3ad_bind_slave - initialize a slave's port
1798  * @slave: slave struct to work on
1799  *
1800  * Returns:   0 on success
1801  *          < 0 on error
1802  */
1803 void bond_3ad_bind_slave(struct slave *slave)
1804 {
1805         struct bonding *bond = bond_get_bond_by_slave(slave);
1806         struct port *port;
1807         struct aggregator *aggregator;
1808
1809         /* check that the slave has not been initialized yet. */
1810         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
1811
1812                 /* port initialization */
1813                 port = &(SLAVE_AD_INFO(slave)->port);
1814
1815                 ad_initialize_port(port, bond->params.lacp_fast);
1816
1817                 port->slave = slave;
1818                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
1819                 /* key is determined according to the link speed, duplex and user key(which
1820                  * is yet not supported)
1821                  */
1822                 port->actor_admin_port_key = 0;
1823                 port->actor_admin_port_key |= __get_duplex(port);
1824                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1825                 port->actor_oper_port_key = port->actor_admin_port_key;
1826                 /* if the port is not full duplex, then the port should be not
1827                  * lacp Enabled
1828                  */
1829                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1830                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1831                 /* actor system is the bond's system */
1832                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1833                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
1834                  * lacpdu's are sent in one second)
1835                  */
1836                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1837                 port->aggregator = NULL;
1838                 port->next_port_in_aggregator = NULL;
1839
1840                 __disable_port(port);
1841
1842                 /* aggregator initialization */
1843                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1844
1845                 ad_initialize_agg(aggregator);
1846
1847                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1848                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
1849                 aggregator->slave = slave;
1850                 aggregator->is_active = 0;
1851                 aggregator->num_of_ports = 0;
1852         }
1853 }
1854
1855 /**
1856  * bond_3ad_unbind_slave - deinitialize a slave's port
1857  * @slave: slave struct to work on
1858  *
1859  * Search for the aggregator that is related to this port, remove the
1860  * aggregator and assign another aggregator for other port related to it
1861  * (if any), and remove the port.
1862  */
1863 void bond_3ad_unbind_slave(struct slave *slave)
1864 {
1865         struct port *port, *prev_port, *temp_port;
1866         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1867         int select_new_active_agg = 0;
1868         struct bonding *bond = slave->bond;
1869         struct slave *slave_iter;
1870         struct list_head *iter;
1871
1872         /* Sync against bond_3ad_state_machine_handler() */
1873         spin_lock_bh(&bond->mode_lock);
1874         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1875         port = &(SLAVE_AD_INFO(slave)->port);
1876
1877         /* if slave is null, the whole port is not initialized */
1878         if (!port->slave) {
1879                 netdev_warn(bond->dev, "Trying to unbind an uninitialized port on %s\n",
1880                             slave->dev->name);
1881                 goto out;
1882         }
1883
1884         netdev_dbg(bond->dev, "Unbinding Link Aggregation Group %d\n",
1885                    aggregator->aggregator_identifier);
1886
1887         /* Tell the partner that this port is not suitable for aggregation */
1888         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1889         __update_lacpdu_from_port(port);
1890         ad_lacpdu_send(port);
1891
1892         /* check if this aggregator is occupied */
1893         if (aggregator->lag_ports) {
1894                 /* check if there are other ports related to this aggregator
1895                  * except the port related to this slave(thats ensure us that
1896                  * there is a reason to search for new aggregator, and that we
1897                  * will find one
1898                  */
1899                 if ((aggregator->lag_ports != port) ||
1900                     (aggregator->lag_ports->next_port_in_aggregator)) {
1901                         /* find new aggregator for the related port(s) */
1902                         bond_for_each_slave(bond, slave_iter, iter) {
1903                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
1904                                 /* if the new aggregator is empty, or it is
1905                                  * connected to our port only
1906                                  */
1907                                 if (!new_aggregator->lag_ports ||
1908                                     ((new_aggregator->lag_ports == port) &&
1909                                      !new_aggregator->lag_ports->next_port_in_aggregator))
1910                                         break;
1911                         }
1912                         if (!slave_iter)
1913                                 new_aggregator = NULL;
1914
1915                         /* if new aggregator found, copy the aggregator's
1916                          * parameters and connect the related lag_ports to the
1917                          * new aggregator
1918                          */
1919                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1920                                 netdev_dbg(bond->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
1921                                            aggregator->aggregator_identifier,
1922                                            new_aggregator->aggregator_identifier);
1923
1924                                 if ((new_aggregator->lag_ports == port) &&
1925                                     new_aggregator->is_active) {
1926                                         netdev_info(bond->dev, "Removing an active aggregator\n");
1927                                          select_new_active_agg = 1;
1928                                 }
1929
1930                                 new_aggregator->is_individual = aggregator->is_individual;
1931                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1932                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1933                                 new_aggregator->partner_system = aggregator->partner_system;
1934                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1935                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1936                                 new_aggregator->receive_state = aggregator->receive_state;
1937                                 new_aggregator->transmit_state = aggregator->transmit_state;
1938                                 new_aggregator->lag_ports = aggregator->lag_ports;
1939                                 new_aggregator->is_active = aggregator->is_active;
1940                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
1941
1942                                 /* update the information that is written on
1943                                  * the ports about the aggregator
1944                                  */
1945                                 for (temp_port = aggregator->lag_ports; temp_port;
1946                                      temp_port = temp_port->next_port_in_aggregator) {
1947                                         temp_port->aggregator = new_aggregator;
1948                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1949                                 }
1950
1951                                 ad_clear_agg(aggregator);
1952
1953                                 if (select_new_active_agg)
1954                                         ad_agg_selection_logic(__get_first_agg(port));
1955                         } else {
1956                                 netdev_warn(bond->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
1957                         }
1958                 } else {
1959                         /* in case that the only port related to this
1960                          * aggregator is the one we want to remove
1961                          */
1962                         select_new_active_agg = aggregator->is_active;
1963                         ad_clear_agg(aggregator);
1964                         if (select_new_active_agg) {
1965                                 netdev_info(bond->dev, "Removing an active aggregator\n");
1966                                 /* select new active aggregator */
1967                                 temp_aggregator = __get_first_agg(port);
1968                                 if (temp_aggregator)
1969                                         ad_agg_selection_logic(temp_aggregator);
1970                         }
1971                 }
1972         }
1973
1974         netdev_dbg(bond->dev, "Unbinding port %d\n", port->actor_port_number);
1975
1976         /* find the aggregator that this port is connected to */
1977         bond_for_each_slave(bond, slave_iter, iter) {
1978                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
1979                 prev_port = NULL;
1980                 /* search the port in the aggregator's related ports */
1981                 for (temp_port = temp_aggregator->lag_ports; temp_port;
1982                      prev_port = temp_port,
1983                      temp_port = temp_port->next_port_in_aggregator) {
1984                         if (temp_port == port) {
1985                                 /* the aggregator found - detach the port from
1986                                  * this aggregator
1987                                  */
1988                                 if (prev_port)
1989                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
1990                                 else
1991                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
1992                                 temp_aggregator->num_of_ports--;
1993                                 if (temp_aggregator->num_of_ports == 0) {
1994                                         select_new_active_agg = temp_aggregator->is_active;
1995                                         ad_clear_agg(temp_aggregator);
1996                                         if (select_new_active_agg) {
1997                                                 netdev_info(bond->dev, "Removing an active aggregator\n");
1998                                                 /* select new active aggregator */
1999                                                 ad_agg_selection_logic(__get_first_agg(port));
2000                                         }
2001                                 }
2002                                 break;
2003                         }
2004                 }
2005         }
2006         port->slave = NULL;
2007
2008 out:
2009         spin_unlock_bh(&bond->mode_lock);
2010 }
2011
2012 /**
2013  * bond_3ad_state_machine_handler - handle state machines timeout
2014  * @bond: bonding struct to work on
2015  *
2016  * The state machine handling concept in this module is to check every tick
2017  * which state machine should operate any function. The execution order is
2018  * round robin, so when we have an interaction between state machines, the
2019  * reply of one to each other might be delayed until next tick.
2020  *
2021  * This function also complete the initialization when the agg_select_timer
2022  * times out, and it selects an aggregator for the ports that are yet not
2023  * related to any aggregator, and selects the active aggregator for a bond.
2024  */
2025 void bond_3ad_state_machine_handler(struct work_struct *work)
2026 {
2027         struct bonding *bond = container_of(work, struct bonding,
2028                                             ad_work.work);
2029         struct aggregator *aggregator;
2030         struct list_head *iter;
2031         struct slave *slave;
2032         struct port *port;
2033         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2034
2035         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2036          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2037          * concurrently due to incoming LACPDU as well.
2038          */
2039         spin_lock_bh(&bond->mode_lock);
2040         rcu_read_lock();
2041
2042         /* check if there are any slaves */
2043         if (!bond_has_slaves(bond))
2044                 goto re_arm;
2045
2046         /* check if agg_select_timer timer after initialize is timed out */
2047         if (BOND_AD_INFO(bond).agg_select_timer &&
2048             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2049                 slave = bond_first_slave_rcu(bond);
2050                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2051
2052                 /* select the active aggregator for the bond */
2053                 if (port) {
2054                         if (!port->slave) {
2055                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2056                                                      bond->dev->name);
2057                                 goto re_arm;
2058                         }
2059
2060                         aggregator = __get_first_agg(port);
2061                         ad_agg_selection_logic(aggregator);
2062                 }
2063                 bond_3ad_set_carrier(bond);
2064         }
2065
2066         /* for each port run the state machines */
2067         bond_for_each_slave_rcu(bond, slave, iter) {
2068                 port = &(SLAVE_AD_INFO(slave)->port);
2069                 if (!port->slave) {
2070                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2071                                             bond->dev->name);
2072                         goto re_arm;
2073                 }
2074
2075                 ad_rx_machine(NULL, port);
2076                 ad_periodic_machine(port);
2077                 ad_port_selection_logic(port);
2078                 ad_mux_machine(port);
2079                 ad_tx_machine(port);
2080
2081                 /* turn off the BEGIN bit, since we already handled it */
2082                 if (port->sm_vars & AD_PORT_BEGIN)
2083                         port->sm_vars &= ~AD_PORT_BEGIN;
2084         }
2085
2086 re_arm:
2087         bond_for_each_slave_rcu(bond, slave, iter) {
2088                 if (slave->should_notify) {
2089                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2090                         break;
2091                 }
2092         }
2093         rcu_read_unlock();
2094         spin_unlock_bh(&bond->mode_lock);
2095
2096         if (should_notify_rtnl && rtnl_trylock()) {
2097                 bond_slave_state_notify(bond);
2098                 rtnl_unlock();
2099         }
2100         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2101 }
2102
2103 /**
2104  * bond_3ad_rx_indication - handle a received frame
2105  * @lacpdu: received lacpdu
2106  * @slave: slave struct to work on
2107  * @length: length of the data received
2108  *
2109  * It is assumed that frames that were sent on this NIC don't returned as new
2110  * received frames (loopback). Since only the payload is given to this
2111  * function, it check for loopback.
2112  */
2113 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave,
2114                                   u16 length)
2115 {
2116         struct port *port;
2117         int ret = RX_HANDLER_ANOTHER;
2118
2119         if (length >= sizeof(struct lacpdu)) {
2120
2121                 port = &(SLAVE_AD_INFO(slave)->port);
2122
2123                 if (!port->slave) {
2124                         net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2125                                              slave->dev->name, slave->bond->dev->name);
2126                         return ret;
2127                 }
2128
2129                 switch (lacpdu->subtype) {
2130                 case AD_TYPE_LACPDU:
2131                         ret = RX_HANDLER_CONSUMED;
2132                         netdev_dbg(slave->bond->dev, "Received LACPDU on port %d\n",
2133                                    port->actor_port_number);
2134                         /* Protect against concurrent state machines */
2135                         spin_lock(&slave->bond->mode_lock);
2136                         ad_rx_machine(lacpdu, port);
2137                         spin_unlock(&slave->bond->mode_lock);
2138                         break;
2139
2140                 case AD_TYPE_MARKER:
2141                         ret = RX_HANDLER_CONSUMED;
2142                         /* No need to convert fields to Little Endian since we
2143                          * don't use the marker's fields.
2144                          */
2145
2146                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2147                         case AD_MARKER_INFORMATION_SUBTYPE:
2148                                 netdev_dbg(slave->bond->dev, "Received Marker Information on port %d\n",
2149                                            port->actor_port_number);
2150                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2151                                 break;
2152
2153                         case AD_MARKER_RESPONSE_SUBTYPE:
2154                                 netdev_dbg(slave->bond->dev, "Received Marker Response on port %d\n",
2155                                            port->actor_port_number);
2156                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2157                                 break;
2158
2159                         default:
2160                                 netdev_dbg(slave->bond->dev, "Received an unknown Marker subtype on slot %d\n",
2161                                            port->actor_port_number);
2162                         }
2163                 }
2164         }
2165         return ret;
2166 }
2167
2168 /**
2169  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2170  * @slave: slave struct to work on
2171  *
2172  * Handle reselection of aggregator (if needed) for this port.
2173  */
2174 void bond_3ad_adapter_speed_changed(struct slave *slave)
2175 {
2176         struct port *port;
2177
2178         port = &(SLAVE_AD_INFO(slave)->port);
2179
2180         /* if slave is null, the whole port is not initialized */
2181         if (!port->slave) {
2182                 netdev_warn(slave->bond->dev, "speed changed for uninitialized port on %s\n",
2183                             slave->dev->name);
2184                 return;
2185         }
2186
2187         spin_lock_bh(&slave->bond->mode_lock);
2188
2189         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2190         port->actor_oper_port_key = port->actor_admin_port_key |=
2191                 (__get_link_speed(port) << 1);
2192         netdev_dbg(slave->bond->dev, "Port %d changed speed\n", port->actor_port_number);
2193         /* there is no need to reselect a new aggregator, just signal the
2194          * state machines to reinitialize
2195          */
2196         port->sm_vars |= AD_PORT_BEGIN;
2197
2198         spin_unlock_bh(&slave->bond->mode_lock);
2199 }
2200
2201 /**
2202  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2203  * @slave: slave struct to work on
2204  *
2205  * Handle reselection of aggregator (if needed) for this port.
2206  */
2207 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2208 {
2209         struct port *port;
2210
2211         port = &(SLAVE_AD_INFO(slave)->port);
2212
2213         /* if slave is null, the whole port is not initialized */
2214         if (!port->slave) {
2215                 netdev_warn(slave->bond->dev, "duplex changed for uninitialized port on %s\n",
2216                             slave->dev->name);
2217                 return;
2218         }
2219
2220         spin_lock_bh(&slave->bond->mode_lock);
2221
2222         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2223         port->actor_oper_port_key = port->actor_admin_port_key |=
2224                 __get_duplex(port);
2225         netdev_dbg(slave->bond->dev, "Port %d changed duplex\n", port->actor_port_number);
2226         /* there is no need to reselect a new aggregator, just signal the
2227          * state machines to reinitialize
2228          */
2229         port->sm_vars |= AD_PORT_BEGIN;
2230
2231         spin_unlock_bh(&slave->bond->mode_lock);
2232 }
2233
2234 /**
2235  * bond_3ad_handle_link_change - handle a slave's link status change indication
2236  * @slave: slave struct to work on
2237  * @status: whether the link is now up or down
2238  *
2239  * Handle reselection of aggregator (if needed) for this port.
2240  */
2241 void bond_3ad_handle_link_change(struct slave *slave, char link)
2242 {
2243         struct port *port;
2244
2245         port = &(SLAVE_AD_INFO(slave)->port);
2246
2247         /* if slave is null, the whole port is not initialized */
2248         if (!port->slave) {
2249                 netdev_warn(slave->bond->dev, "link status changed for uninitialized port on %s\n",
2250                             slave->dev->name);
2251                 return;
2252         }
2253
2254         spin_lock_bh(&slave->bond->mode_lock);
2255         /* on link down we are zeroing duplex and speed since
2256          * some of the adaptors(ce1000.lan) report full duplex/speed
2257          * instead of N/A(duplex) / 0(speed).
2258          *
2259          * on link up we are forcing recheck on the duplex and speed since
2260          * some of he adaptors(ce1000.lan) report.
2261          */
2262         if (link == BOND_LINK_UP) {
2263                 port->is_enabled = true;
2264                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2265                 port->actor_oper_port_key = port->actor_admin_port_key |=
2266                         __get_duplex(port);
2267                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2268                 port->actor_oper_port_key = port->actor_admin_port_key |=
2269                         (__get_link_speed(port) << 1);
2270         } else {
2271                 /* link has failed */
2272                 port->is_enabled = false;
2273                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2274                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2275                                              ~AD_SPEED_KEY_BITS);
2276         }
2277         netdev_dbg(slave->bond->dev, "Port %d changed link status to %s\n",
2278                    port->actor_port_number,
2279                    link == BOND_LINK_UP ? "UP" : "DOWN");
2280         /* there is no need to reselect a new aggregator, just signal the
2281          * state machines to reinitialize
2282          */
2283         port->sm_vars |= AD_PORT_BEGIN;
2284
2285         spin_unlock_bh(&slave->bond->mode_lock);
2286 }
2287
2288 /**
2289  * bond_3ad_set_carrier - set link state for bonding master
2290  * @bond - bonding structure
2291  *
2292  * if we have an active aggregator, we're up, if not, we're down.
2293  * Presumes that we cannot have an active aggregator if there are
2294  * no slaves with link up.
2295  *
2296  * This behavior complies with IEEE 802.3 section 43.3.9.
2297  *
2298  * Called by bond_set_carrier(). Return zero if carrier state does not
2299  * change, nonzero if it does.
2300  */
2301 int bond_3ad_set_carrier(struct bonding *bond)
2302 {
2303         struct aggregator *active;
2304         struct slave *first_slave;
2305         int ret = 1;
2306
2307         rcu_read_lock();
2308         first_slave = bond_first_slave_rcu(bond);
2309         if (!first_slave) {
2310                 ret = 0;
2311                 goto out;
2312         }
2313         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2314         if (active) {
2315                 /* are enough slaves available to consider link up? */
2316                 if (active->num_of_ports < bond->params.min_links) {
2317                         if (netif_carrier_ok(bond->dev)) {
2318                                 netif_carrier_off(bond->dev);
2319                                 goto out;
2320                         }
2321                 } else if (!netif_carrier_ok(bond->dev)) {
2322                         netif_carrier_on(bond->dev);
2323                         goto out;
2324                 }
2325         } else if (netif_carrier_ok(bond->dev)) {
2326                 netif_carrier_off(bond->dev);
2327         }
2328 out:
2329         rcu_read_unlock();
2330         return ret;
2331 }
2332
2333 /**
2334  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2335  * @bond: bonding struct to work on
2336  * @ad_info: ad_info struct to fill with the bond's info
2337  *
2338  * Returns:   0 on success
2339  *          < 0 on error
2340  */
2341 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2342                                    struct ad_info *ad_info)
2343 {
2344         struct aggregator *aggregator = NULL;
2345         struct list_head *iter;
2346         struct slave *slave;
2347         struct port *port;
2348
2349         bond_for_each_slave_rcu(bond, slave, iter) {
2350                 port = &(SLAVE_AD_INFO(slave)->port);
2351                 if (port->aggregator && port->aggregator->is_active) {
2352                         aggregator = port->aggregator;
2353                         break;
2354                 }
2355         }
2356
2357         if (!aggregator)
2358                 return -1;
2359
2360         ad_info->aggregator_id = aggregator->aggregator_identifier;
2361         ad_info->ports = aggregator->num_of_ports;
2362         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2363         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2364         ether_addr_copy(ad_info->partner_system,
2365                         aggregator->partner_system.mac_addr_value);
2366         return 0;
2367 }
2368
2369 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2370 {
2371         int ret;
2372
2373         rcu_read_lock();
2374         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2375         rcu_read_unlock();
2376
2377         return ret;
2378 }
2379
2380 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2381 {
2382         struct bonding *bond = netdev_priv(dev);
2383         struct slave *slave, *first_ok_slave;
2384         struct aggregator *agg;
2385         struct ad_info ad_info;
2386         struct list_head *iter;
2387         int slaves_in_agg;
2388         int slave_agg_no;
2389         int agg_id;
2390
2391         if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2392                 netdev_dbg(dev, "__bond_3ad_get_active_agg_info failed\n");
2393                 goto err_free;
2394         }
2395
2396         slaves_in_agg = ad_info.ports;
2397         agg_id = ad_info.aggregator_id;
2398
2399         if (slaves_in_agg == 0) {
2400                 netdev_dbg(dev, "active aggregator is empty\n");
2401                 goto err_free;
2402         }
2403
2404         slave_agg_no = bond_xmit_hash(bond, skb) % slaves_in_agg;
2405         first_ok_slave = NULL;
2406
2407         bond_for_each_slave_rcu(bond, slave, iter) {
2408                 agg = SLAVE_AD_INFO(slave)->port.aggregator;
2409                 if (!agg || agg->aggregator_identifier != agg_id)
2410                         continue;
2411
2412                 if (slave_agg_no >= 0) {
2413                         if (!first_ok_slave && bond_slave_can_tx(slave))
2414                                 first_ok_slave = slave;
2415                         slave_agg_no--;
2416                         continue;
2417                 }
2418
2419                 if (bond_slave_can_tx(slave)) {
2420                         bond_dev_queue_xmit(bond, skb, slave->dev);
2421                         goto out;
2422                 }
2423         }
2424
2425         if (slave_agg_no >= 0) {
2426                 netdev_err(dev, "Couldn't find a slave to tx on for aggregator ID %d\n",
2427                            agg_id);
2428                 goto err_free;
2429         }
2430
2431         /* we couldn't find any suitable slave after the agg_no, so use the
2432          * first suitable found, if found.
2433          */
2434         if (first_ok_slave)
2435                 bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2436         else
2437                 goto err_free;
2438
2439 out:
2440         return NETDEV_TX_OK;
2441 err_free:
2442         /* no suitable interface, frame not sent */
2443         dev_kfree_skb_any(skb);
2444         goto out;
2445 }
2446
2447 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2448                          struct slave *slave)
2449 {
2450         struct lacpdu *lacpdu, _lacpdu;
2451
2452         if (skb->protocol != PKT_TYPE_LACPDU)
2453                 return RX_HANDLER_ANOTHER;
2454
2455         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2456         if (!lacpdu)
2457                 return RX_HANDLER_ANOTHER;
2458
2459         return bond_3ad_rx_indication(lacpdu, slave, skb->len);
2460 }
2461
2462 /**
2463  * bond_3ad_update_lacp_rate - change the lacp rate
2464  * @bond - bonding struct
2465  *
2466  * When modify lacp_rate parameter via sysfs,
2467  * update actor_oper_port_state of each port.
2468  *
2469  * Hold bond->mode_lock,
2470  * so we can modify port->actor_oper_port_state,
2471  * no matter bond is up or down.
2472  */
2473 void bond_3ad_update_lacp_rate(struct bonding *bond)
2474 {
2475         struct port *port = NULL;
2476         struct list_head *iter;
2477         struct slave *slave;
2478         int lacp_fast;
2479
2480         lacp_fast = bond->params.lacp_fast;
2481         spin_lock_bh(&bond->mode_lock);
2482         bond_for_each_slave(bond, slave, iter) {
2483                 port = &(SLAVE_AD_INFO(slave)->port);
2484                 if (lacp_fast)
2485                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2486                 else
2487                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2488         }
2489         spin_unlock_bh(&bond->mode_lock);
2490 }