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