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