drivers/net/bonding/bond_3ad.c

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