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