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