Pileus Git - ~andy/linux/blob - 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/skbuff.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/if_bonding.h>
  32 #include <linux/pkt_sched.h>
  33 #include <net/net_namespace.h>
  34 #include "bonding.h"
  35 #include "bond_3ad.h"
  36
  37 // General definitions
  38 #define AD_SHORT_TIMEOUT           1
  39 #define AD_LONG_TIMEOUT            0
  40 #define AD_STANDBY                 0x2
  41 #define AD_MAX_TX_IN_SECOND        3
  42 #define AD_COLLECTOR_MAX_DELAY     0
  43
  44 // Timer definitions(43.4.4 in the 802.3ad standard)
  45 #define AD_FAST_PERIODIC_TIME      1
  46 #define AD_SLOW_PERIODIC_TIME      30
  47 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  48 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  49 #define AD_CHURN_DETECTION_TIME    60
  50 #define AD_AGGREGATE_WAIT_TIME     2
  51
  52 // Port state definitions(43.4.2.2 in the 802.3ad standard)
  53 #define AD_STATE_LACP_ACTIVITY   0x1
  54 #define AD_STATE_LACP_TIMEOUT    0x2
  55 #define AD_STATE_AGGREGATION     0x4
  56 #define AD_STATE_SYNCHRONIZATION 0x8
  57 #define AD_STATE_COLLECTING      0x10
  58 #define AD_STATE_DISTRIBUTING    0x20
  59 #define AD_STATE_DEFAULTED       0x40
  60 #define AD_STATE_EXPIRED         0x80
  61
  62 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
  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
  74 // Port Key definitions
  75 // key is determined according to the link speed, duplex and
  76 // user key(which is yet not supported)
  77 //              ------------------------------------------------------------
  78 // Port key :   | User key                       |      Speed       |Duplex|
  79 //              ------------------------------------------------------------
  80 //              16                               6               1 0
  81 #define  AD_DUPLEX_KEY_BITS    0x1
  82 #define  AD_SPEED_KEY_BITS     0x3E
  83 #define  AD_USER_KEY_BITS      0xFFC0
  84
  85 //dalloun
  86 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
  87 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
  88 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
  89 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
  90 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
  91 //endalloun
  92
  93 /* compare MAC addresses */
  94 #define MAC_ADDRESS_EQUAL(A, B) \
  95         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
  96
  97 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
  98 static u16 ad_ticks_per_sec;
  99 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
 100
 101 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 102
 103 // ================= main 802.3ad protocol functions ==================
 104 static int ad_lacpdu_send(struct port *port);
 105 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 106 static void ad_mux_machine(struct port *port);
 107 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 108 static void ad_tx_machine(struct port *port);
 109 static void ad_periodic_machine(struct port *port);
 110 static void ad_port_selection_logic(struct port *port);
 111 static void ad_agg_selection_logic(struct aggregator *aggregator);
 112 static void ad_clear_agg(struct aggregator *aggregator);
 113 static void ad_initialize_agg(struct aggregator *aggregator);
 114 static void ad_initialize_port(struct port *port, int lacp_fast);
 115 static void ad_enable_collecting_distributing(struct port *port);
 116 static void ad_disable_collecting_distributing(struct port *port);
 117 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 118 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 119
 120
 121 /////////////////////////////////////////////////////////////////////////////////
 122 // ================= api to bonding and kernel code ==================
 123 /////////////////////////////////////////////////////////////////////////////////
 124
 125 /**
 126  * __get_bond_by_port - get the port's bonding struct
 127  * @port: the port we're looking at
 128  *
 129  * Return @port's bonding struct, or %NULL if it can't be found.
 130  */
 131 static inline struct bonding *__get_bond_by_port(struct port *port)
 132 {
 133         if (port->slave == NULL)
 134                 return NULL;
 135
 136         return bond_get_bond_by_slave(port->slave);
 137 }
 138
 139 /**
 140  * __get_first_agg - get the first aggregator in the bond
 141  * @bond: the bond we're looking at
 142  *
 143  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 144  * found.
 145  */
 146 static inline struct aggregator *__get_first_agg(struct port *port)
 147 {
 148         struct bonding *bond = __get_bond_by_port(port);
 149         struct slave *first_slave;
 150
 151         /* If there's no bond for this port, or bond has no slaves */
 152         if (bond == NULL)
 153                 return NULL;
 154         rcu_read_lock();
 155         first_slave = bond_first_slave_rcu(bond);
 156         rcu_read_unlock();
 157         return first_slave ? &(SLAVE_AD_INFO(first_slave).aggregator) : NULL;
 158 }
 159
 160 /*
 161  * __agg_has_partner
 162  *
 163  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 164  * address for the partner).  Return 0 if not.
 165  */
 166 static inline int __agg_has_partner(struct aggregator *agg)
 167 {
 168         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 169 }
 170
 171 /**
 172  * __disable_port - disable the port's slave
 173  * @port: the port we're looking at
 174  *
 175  */
 176 static inline void __disable_port(struct port *port)
 177 {
 178         bond_set_slave_inactive_flags(port->slave);
 179 }
 180
 181 /**
 182  * __enable_port - enable the port's slave, if it's up
 183  * @port: the port we're looking at
 184  *
 185  */
 186 static inline void __enable_port(struct port *port)
 187 {
 188         struct slave *slave = port->slave;
 189
 190         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
 191                 bond_set_slave_active_flags(slave);
 192 }
 193
 194 /**
 195  * __port_is_enabled - check if the port's slave is in active state
 196  * @port: the port we're looking at
 197  *
 198  */
 199 static inline int __port_is_enabled(struct port *port)
 200 {
 201         return bond_is_active_slave(port->slave);
 202 }
 203
 204 /**
 205  * __get_agg_selection_mode - get the aggregator selection mode
 206  * @port: the port we're looking at
 207  *
 208  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 209  */
 210 static inline u32 __get_agg_selection_mode(struct port *port)
 211 {
 212         struct bonding *bond = __get_bond_by_port(port);
 213
 214         if (bond == NULL)
 215                 return BOND_AD_STABLE;
 216
 217         return bond->params.ad_select;
 218 }
 219
 220 /**
 221  * __check_agg_selection_timer - check if the selection timer has expired
 222  * @port: the port we're looking at
 223  *
 224  */
 225 static inline int __check_agg_selection_timer(struct port *port)
 226 {
 227         struct bonding *bond = __get_bond_by_port(port);
 228
 229         if (bond == NULL)
 230                 return 0;
 231
 232         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 233 }
 234
 235 /**
 236  * __get_state_machine_lock - lock the port's state machines
 237  * @port: the port we're looking at
 238  *
 239  */
 240 static inline void __get_state_machine_lock(struct port *port)
 241 {
 242         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 243 }
 244
 245 /**
 246  * __release_state_machine_lock - unlock the port's state machines
 247  * @port: the port we're looking at
 248  *
 249  */
 250 static inline void __release_state_machine_lock(struct port *port)
 251 {
 252         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 253 }
 254
 255 /**
 256  * __get_link_speed - get a port's speed
 257  * @port: the port we're looking at
 258  *
 259  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 260  *     0,
 261  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 262  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 263  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 264  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 265  */
 266 static u16 __get_link_speed(struct port *port)
 267 {
 268         struct slave *slave = port->slave;
 269         u16 speed;
 270
 271         /* this if covers only a special case: when the configuration starts with
 272          * link down, it sets the speed to 0.
 273          * This is done in spite of the fact that the e100 driver reports 0 to be
 274          * compatible with MVT in the future.*/
 275         if (slave->link != BOND_LINK_UP)
 276                 speed = 0;
 277         else {
 278                 switch (slave->speed) {
 279                 case SPEED_10:
 280                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 281                         break;
 282
 283                 case SPEED_100:
 284                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 285                         break;
 286
 287                 case SPEED_1000:
 288                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 289                         break;
 290
 291                 case SPEED_10000:
 292                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 293                         break;
 294
 295                 default:
 296                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 297                         break;
 298                 }
 299         }
 300
 301         pr_debug("Port %d Received link speed %d update from adapter\n",
 302                  port->actor_port_number, speed);
 303         return speed;
 304 }
 305
 306 /**
 307  * __get_duplex - get a port's duplex
 308  * @port: the port we're looking at
 309  *
 310  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 311  *     0x01 if in full duplex
 312  *     0x00 otherwise
 313  */
 314 static u8 __get_duplex(struct port *port)
 315 {
 316         struct slave *slave = port->slave;
 317
 318         u8 retval;
 319
 320         //  handling a special case: when the configuration starts with
 321         // link down, it sets the duplex to 0.
 322         if (slave->link != BOND_LINK_UP)
 323                 retval = 0x0;
 324         else {
 325                 switch (slave->duplex) {
 326                 case DUPLEX_FULL:
 327                         retval = 0x1;
 328                         pr_debug("Port %d Received status full duplex update from adapter\n",
 329                                  port->actor_port_number);
 330                         break;
 331                 case DUPLEX_HALF:
 332                 default:
 333                         retval = 0x0;
 334                         pr_debug("Port %d Received status NOT full duplex update from adapter\n",
 335                                  port->actor_port_number);
 336                         break;
 337                 }
 338         }
 339         return retval;
 340 }
 341
 342 /**
 343  * __initialize_port_locks - initialize a port's STATE machine spinlock
 344  * @port: the slave of the port we're looking at
 345  *
 346  */
 347 static inline void __initialize_port_locks(struct slave *slave)
 348 {
 349         // make sure it isn't called twice
 350         spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
 351 }
 352
 353 //conversions
 354
 355 /**
 356  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 357  * @timer_type: which timer to operate
 358  * @par: timer parameter. see below
 359  *
 360  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 361  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 362  *                                                  %SLOW_PERIODIC_TIME.
 363  */
 364 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 365 {
 366         u16 retval = 0; /* to silence the compiler */
 367
 368         switch (timer_type) {
 369         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 370                 if (par)
 371                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 372                 else
 373                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 374                 break;
 375         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 376                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 377                 break;
 378         case AD_PERIODIC_TIMER:     // for periodic machine
 379                 retval = (par*ad_ticks_per_sec); // long timeout
 380                 break;
 381         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 382                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 383                 break;
 384         case AD_WAIT_WHILE_TIMER:           // for selection machine
 385                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 386                 break;
 387         }
 388         return retval;
 389 }
 390
 391
 392 /////////////////////////////////////////////////////////////////////////////////
 393 // ================= ad_rx_machine helper functions ==================
 394 /////////////////////////////////////////////////////////////////////////////////
 395
 396 /**
 397  * __choose_matched - update a port's matched variable from a received lacpdu
 398  * @lacpdu: the lacpdu we've received
 399  * @port: the port we're looking at
 400  *
 401  * Update the value of the matched variable, using parameter values from a
 402  * newly received lacpdu. Parameter values for the partner carried in the
 403  * received PDU are compared with the corresponding operational parameter
 404  * values for the actor. Matched is set to TRUE if all of these parameters
 405  * match and the PDU parameter partner_state.aggregation has the same value as
 406  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 407  * in the aggregation. Matched is also set to TRUE if the value of
 408  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 409  * an individual link and lacp will actively maintain the link. Otherwise,
 410  * matched is set to FALSE. LACP is considered to be actively maintaining the
 411  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 412  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 413  * partner_state.lacp_activity variables are TRUE.
 414  *
 415  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 416  * used here to implement the language from 802.3ad 43.4.9 that requires
 417  * recordPDU to "match" the LACPDU parameters to the stored values.
 418  */
 419 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 420 {
 421         /* check if all parameters are alike
 422          * or this is individual link(aggregation == FALSE)
 423          * then update the state machine Matched variable.
 424          */
 425         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 426              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 427              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 428              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 429              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 430              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 431             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 432                 ) {
 433                 port->sm_vars |= AD_PORT_MATCHED;
 434         } else {
 435                 port->sm_vars &= ~AD_PORT_MATCHED;
 436         }
 437 }
 438
 439 /**
 440  * __record_pdu - record parameters from a received lacpdu
 441  * @lacpdu: the lacpdu we've received
 442  * @port: the port we're looking at
 443  *
 444  * Record the parameter values for the Actor carried in a received lacpdu as
 445  * the current partner operational parameter values and sets
 446  * actor_oper_port_state.defaulted to FALSE.
 447  */
 448 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 449 {
 450         if (lacpdu && port) {
 451                 struct port_params *partner = &port->partner_oper;
 452
 453                 __choose_matched(lacpdu, port);
 454                 // record the new parameter values for the partner operational
 455                 partner->port_number = ntohs(lacpdu->actor_port);
 456                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 457                 partner->system = lacpdu->actor_system;
 458                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 459                 partner->key = ntohs(lacpdu->actor_key);
 460                 partner->port_state = lacpdu->actor_state;
 461
 462                 // set actor_oper_port_state.defaulted to FALSE
 463                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 464
 465                 // set the partner sync. to on if the partner is sync. and the port is matched
 466                 if ((port->sm_vars & AD_PORT_MATCHED)
 467                     && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
 468                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 469                 else
 470                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 471         }
 472 }
 473
 474 /**
 475  * __record_default - record default parameters
 476  * @port: the port we're looking at
 477  *
 478  * This function records the default parameter values for the partner carried
 479  * in the Partner Admin parameters as the current partner operational parameter
 480  * values and sets actor_oper_port_state.defaulted to TRUE.
 481  */
 482 static void __record_default(struct port *port)
 483 {
 484         if (port) {
 485                 // record the partner admin parameters
 486                 memcpy(&port->partner_oper, &port->partner_admin,
 487                        sizeof(struct port_params));
 488
 489                 // set actor_oper_port_state.defaulted to true
 490                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 491         }
 492 }
 493
 494 /**
 495  * __update_selected - update a port's Selected variable from a received lacpdu
 496  * @lacpdu: the lacpdu we've received
 497  * @port: the port we're looking at
 498  *
 499  * Update the value of the selected variable, using parameter values from a
 500  * newly received lacpdu. The parameter values for the Actor carried in the
 501  * received PDU are compared with the corresponding operational parameter
 502  * values for the ports partner. If one or more of the comparisons shows that
 503  * the value(s) received in the PDU differ from the current operational values,
 504  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 505  * set to out_of_sync. Otherwise, selected remains unchanged.
 506  */
 507 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 508 {
 509         if (lacpdu && port) {
 510                 const struct port_params *partner = &port->partner_oper;
 511
 512                 /* check if any parameter is different then
 513                  * update the state machine selected variable.
 514                  */
 515                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 516                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 517                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 518                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 519                     ntohs(lacpdu->actor_key) != partner->key ||
 520                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 521                         port->sm_vars &= ~AD_PORT_SELECTED;
 522                 }
 523         }
 524 }
 525
 526 /**
 527  * __update_default_selected - update a port's Selected variable from Partner
 528  * @port: the port we're looking at
 529  *
 530  * This function updates the value of the selected variable, using the partner
 531  * administrative parameter values. The administrative values are compared with
 532  * the corresponding operational parameter values for the partner. If one or
 533  * more of the comparisons shows that the administrative value(s) differ from
 534  * the current operational values, then Selected is set to FALSE and
 535  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 536  * Selected remains unchanged.
 537  */
 538 static void __update_default_selected(struct port *port)
 539 {
 540         if (port) {
 541                 const struct port_params *admin = &port->partner_admin;
 542                 const struct port_params *oper = &port->partner_oper;
 543
 544                 /* check if any parameter is different then
 545                  * update the state machine selected variable.
 546                  */
 547                 if (admin->port_number != oper->port_number ||
 548                     admin->port_priority != oper->port_priority ||
 549                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 550                     admin->system_priority != oper->system_priority ||
 551                     admin->key != oper->key ||
 552                     (admin->port_state & AD_STATE_AGGREGATION)
 553                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 554                         port->sm_vars &= ~AD_PORT_SELECTED;
 555                 }
 556         }
 557 }
 558
 559 /**
 560  * __update_ntt - update a port's ntt variable from a received lacpdu
 561  * @lacpdu: the lacpdu we've received
 562  * @port: the port we're looking at
 563  *
 564  * Updates the value of the ntt variable, using parameter values from a newly
 565  * received lacpdu. The parameter values for the partner carried in the
 566  * received PDU are compared with the corresponding operational parameter
 567  * values for the Actor. If one or more of the comparisons shows that the
 568  * value(s) received in the PDU differ from the current operational values,
 569  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 570  */
 571 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 572 {
 573         /* validate lacpdu and port */
 574         if (lacpdu && port) {
 575                 /* check if any parameter is different then
 576                  * update the port->ntt.
 577                  */
 578                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 579                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 580                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 581                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 582                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 583                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 584                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 585                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 586                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 587                    ) {
 588                         port->ntt = true;
 589                 }
 590         }
 591 }
 592
 593 /**
 594  * __attach_bond_to_agg
 595  * @port: the port we're looking at
 596  *
 597  * Handle the attaching of the port's control parser/multiplexer and the
 598  * aggregator. This function does nothing since the parser/multiplexer of the
 599  * receive and the parser/multiplexer of the aggregator are already combined.
 600  */
 601 static void __attach_bond_to_agg(struct port *port)
 602 {
 603         port = NULL; /* just to satisfy the compiler */
 604         // This function does nothing since the parser/multiplexer of the receive
 605         // and the parser/multiplexer of the aggregator are already combined
 606 }
 607
 608 /**
 609  * __detach_bond_from_agg
 610  * @port: the port we're looking at
 611  *
 612  * Handle the detaching of the port's control parser/multiplexer from the
 613  * aggregator. This function does nothing since the parser/multiplexer of the
 614  * receive and the parser/multiplexer of the aggregator are already combined.
 615  */
 616 static void __detach_bond_from_agg(struct port *port)
 617 {
 618         port = NULL; /* just to satisfy the compiler */
 619         // This function does nothing since the parser/multiplexer of the receive
 620         // and the parser/multiplexer of the aggregator are already combined
 621 }
 622
 623 /**
 624  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 625  * @aggregator: the aggregator we're looking at
 626  *
 627  */
 628 static int __agg_ports_are_ready(struct aggregator *aggregator)
 629 {
 630         struct port *port;
 631         int retval = 1;
 632
 633         if (aggregator) {
 634                 // scan all ports in this aggregator to verfy if they are all ready
 635                 for (port = aggregator->lag_ports;
 636                      port;
 637                      port = port->next_port_in_aggregator) {
 638                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 639                                 retval = 0;
 640                                 break;
 641                         }
 642                 }
 643         }
 644
 645         return retval;
 646 }
 647
 648 /**
 649  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 650  * @aggregator: the aggregator we're looking at
 651  * @val: Should the ports' ready bit be set on or off
 652  *
 653  */
 654 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 655 {
 656         struct port *port;
 657
 658         for (port = aggregator->lag_ports; port;
 659              port = port->next_port_in_aggregator) {
 660                 if (val)
 661                         port->sm_vars |= AD_PORT_READY;
 662                 else
 663                         port->sm_vars &= ~AD_PORT_READY;
 664         }
 665 }
 666
 667 /**
 668  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 669  * @aggregator: the aggregator we're looking at
 670  *
 671  */
 672 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 673 {
 674         u32 bandwidth = 0;
 675
 676         if (aggregator->num_of_ports) {
 677                 switch (__get_link_speed(aggregator->lag_ports)) {
 678                 case AD_LINK_SPEED_BITMASK_1MBPS:
 679                         bandwidth = aggregator->num_of_ports;
 680                         break;
 681                 case AD_LINK_SPEED_BITMASK_10MBPS:
 682                         bandwidth = aggregator->num_of_ports * 10;
 683                         break;
 684                 case AD_LINK_SPEED_BITMASK_100MBPS:
 685                         bandwidth = aggregator->num_of_ports * 100;
 686                         break;
 687                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 688                         bandwidth = aggregator->num_of_ports * 1000;
 689                         break;
 690                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 691                         bandwidth = aggregator->num_of_ports * 10000;
 692                         break;
 693                 default:
 694                         bandwidth = 0; /*to silence the compiler ....*/
 695                 }
 696         }
 697         return bandwidth;
 698 }
 699
 700 /**
 701  * __get_active_agg - get the current active aggregator
 702  * @aggregator: the aggregator we're looking at
 703  *
 704  */
 705 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 706 {
 707         struct bonding *bond = aggregator->slave->bond;
 708         struct list_head *iter;
 709         struct slave *slave;
 710
 711         rcu_read_lock();
 712         bond_for_each_slave_rcu(bond, slave, iter)
 713                 if (SLAVE_AD_INFO(slave).aggregator.is_active) {
 714                         rcu_read_unlock();
 715                         return &(SLAVE_AD_INFO(slave).aggregator);
 716                 }
 717         rcu_read_unlock();
 718
 719         return NULL;
 720 }
 721
 722 /**
 723  * __update_lacpdu_from_port - update a port's lacpdu fields
 724  * @port: the port we're looking at
 725  *
 726  */
 727 static inline void __update_lacpdu_from_port(struct port *port)
 728 {
 729         struct lacpdu *lacpdu = &port->lacpdu;
 730         const struct port_params *partner = &port->partner_oper;
 731
 732         /* update current actual Actor parameters */
 733         /* lacpdu->subtype                   initialized
 734          * lacpdu->version_number            initialized
 735          * lacpdu->tlv_type_actor_info       initialized
 736          * lacpdu->actor_information_length  initialized
 737          */
 738
 739         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 740         lacpdu->actor_system = port->actor_system;
 741         lacpdu->actor_key = htons(port->actor_oper_port_key);
 742         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 743         lacpdu->actor_port = htons(port->actor_port_number);
 744         lacpdu->actor_state = port->actor_oper_port_state;
 745
 746         /* lacpdu->reserved_3_1              initialized
 747          * lacpdu->tlv_type_partner_info     initialized
 748          * lacpdu->partner_information_length initialized
 749          */
 750
 751         lacpdu->partner_system_priority = htons(partner->system_priority);
 752         lacpdu->partner_system = partner->system;
 753         lacpdu->partner_key = htons(partner->key);
 754         lacpdu->partner_port_priority = htons(partner->port_priority);
 755         lacpdu->partner_port = htons(partner->port_number);
 756         lacpdu->partner_state = partner->port_state;
 757
 758         /* lacpdu->reserved_3_2              initialized
 759          * lacpdu->tlv_type_collector_info   initialized
 760          * lacpdu->collector_information_length initialized
 761          * collector_max_delay                initialized
 762          * reserved_12[12]                   initialized
 763          * tlv_type_terminator               initialized
 764          * terminator_length                 initialized
 765          * reserved_50[50]                   initialized
 766          */
 767 }
 768
 769 //////////////////////////////////////////////////////////////////////////////////////
 770 // ================= main 802.3ad protocol code ======================================
 771 //////////////////////////////////////////////////////////////////////////////////////
 772
 773 /**
 774  * ad_lacpdu_send - send out a lacpdu packet on a given port
 775  * @port: the port we're looking at
 776  *
 777  * Returns:   0 on success
 778  *          < 0 on error
 779  */
 780 static int ad_lacpdu_send(struct port *port)
 781 {
 782         struct slave *slave = port->slave;
 783         struct sk_buff *skb;
 784         struct lacpdu_header *lacpdu_header;
 785         int length = sizeof(struct lacpdu_header);
 786
 787         skb = dev_alloc_skb(length);
 788         if (!skb)
 789                 return -ENOMEM;
 790
 791         skb->dev = slave->dev;
 792         skb_reset_mac_header(skb);
 793         skb->network_header = skb->mac_header + ETH_HLEN;
 794         skb->protocol = PKT_TYPE_LACPDU;
 795         skb->priority = TC_PRIO_CONTROL;
 796
 797         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 798
 799         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 800         /* Note: source address is set to be the member's PERMANENT address,
 801            because we use it to identify loopback lacpdus in receive. */
 802         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 803         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 804
 805         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 806
 807         dev_queue_xmit(skb);
 808
 809         return 0;
 810 }
 811
 812 /**
 813  * ad_marker_send - send marker information/response on a given port
 814  * @port: the port we're looking at
 815  * @marker: marker data to send
 816  *
 817  * Returns:   0 on success
 818  *          < 0 on error
 819  */
 820 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 821 {
 822         struct slave *slave = port->slave;
 823         struct sk_buff *skb;
 824         struct bond_marker_header *marker_header;
 825         int length = sizeof(struct bond_marker_header);
 826
 827         skb = dev_alloc_skb(length + 16);
 828         if (!skb)
 829                 return -ENOMEM;
 830
 831         skb_reserve(skb, 16);
 832
 833         skb->dev = slave->dev;
 834         skb_reset_mac_header(skb);
 835         skb->network_header = skb->mac_header + ETH_HLEN;
 836         skb->protocol = PKT_TYPE_LACPDU;
 837
 838         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 839
 840         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 841         /* Note: source address is set to be the member's PERMANENT address,
 842            because we use it to identify loopback MARKERs in receive. */
 843         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 844         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 845
 846         marker_header->marker = *marker; // struct copy
 847
 848         dev_queue_xmit(skb);
 849
 850         return 0;
 851 }
 852
 853 /**
 854  * ad_mux_machine - handle a port's mux state machine
 855  * @port: the port we're looking at
 856  *
 857  */
 858 static void ad_mux_machine(struct port *port)
 859 {
 860         mux_states_t last_state;
 861
 862         // keep current State Machine state to compare later if it was changed
 863         last_state = port->sm_mux_state;
 864
 865         if (port->sm_vars & AD_PORT_BEGIN) {
 866                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 867         } else {
 868                 switch (port->sm_mux_state) {
 869                 case AD_MUX_DETACHED:
 870                         if ((port->sm_vars & AD_PORT_SELECTED)
 871                             || (port->sm_vars & AD_PORT_STANDBY))
 872                                 /* if SELECTED or STANDBY */
 873                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 874                         break;
 875                 case AD_MUX_WAITING:
 876                         // if SELECTED == FALSE return to DETACH state
 877                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 878                                 port->sm_vars &= ~AD_PORT_READY_N;
 879                                 // in order to withhold the Selection Logic to check all ports READY_N value
 880                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 881                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 882                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 883                                 break;
 884                         }
 885
 886                         // check if the wait_while_timer expired
 887                         if (port->sm_mux_timer_counter
 888                             && !(--port->sm_mux_timer_counter))
 889                                 port->sm_vars |= AD_PORT_READY_N;
 890
 891                         // in order to withhold the selection logic to check all ports READY_N value
 892                         // every callback cycle to update ready variable, we check READY_N and update READY here
 893                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 894
 895                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 896                         if ((port->sm_vars & AD_PORT_READY)
 897                             && !port->sm_mux_timer_counter)
 898                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 899                         break;
 900                 case AD_MUX_ATTACHED:
 901                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 902                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 903                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 904                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 905                                 port->sm_vars &= ~AD_PORT_READY_N;
 906                                 // in order to withhold the selection logic to check all ports READY_N value
 907                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 908                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 909                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 910                         }
 911                         break;
 912                 case AD_MUX_COLLECTING_DISTRIBUTING:
 913                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 914                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 915                            ) {
 916                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 917
 918                         } else {
 919                                 // if port state hasn't changed make
 920                                 // sure that a collecting distributing
 921                                 // port in an active aggregator is enabled
 922                                 if (port->aggregator &&
 923                                     port->aggregator->is_active &&
 924                                     !__port_is_enabled(port)) {
 925
 926                                         __enable_port(port);
 927                                 }
 928                         }
 929                         break;
 930                 default:    //to silence the compiler
 931                         break;
 932                 }
 933         }
 934
 935         // check if the state machine was changed
 936         if (port->sm_mux_state != last_state) {
 937                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
 938                          port->actor_port_number, last_state,
 939                          port->sm_mux_state);
 940                 switch (port->sm_mux_state) {
 941                 case AD_MUX_DETACHED:
 942                         __detach_bond_from_agg(port);
 943                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 944                         ad_disable_collecting_distributing(port);
 945                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 946                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 947                         port->ntt = true;
 948                         break;
 949                 case AD_MUX_WAITING:
 950                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 951                         break;
 952                 case AD_MUX_ATTACHED:
 953                         __attach_bond_to_agg(port);
 954                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 955                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 956                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 957                         ad_disable_collecting_distributing(port);
 958                         port->ntt = true;
 959                         break;
 960                 case AD_MUX_COLLECTING_DISTRIBUTING:
 961                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 962                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 963                         ad_enable_collecting_distributing(port);
 964                         port->ntt = true;
 965                         break;
 966                 default:    //to silence the compiler
 967                         break;
 968                 }
 969         }
 970 }
 971
 972 /**
 973  * ad_rx_machine - handle a port's rx State Machine
 974  * @lacpdu: the lacpdu we've received
 975  * @port: the port we're looking at
 976  *
 977  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
 978  * CURRENT. If timer expired set the state machine in the proper state.
 979  * In other cases, this function checks if we need to switch to other state.
 980  */
 981 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
 982 {
 983         rx_states_t last_state;
 984
 985         // keep current State Machine state to compare later if it was changed
 986         last_state = port->sm_rx_state;
 987
 988         // check if state machine should change state
 989         // first, check if port was reinitialized
 990         if (port->sm_vars & AD_PORT_BEGIN)
 991                 /* next state */
 992                 port->sm_rx_state = AD_RX_INITIALIZE;
 993         // check if port is not enabled
 994         else if (!(port->sm_vars & AD_PORT_BEGIN)
 995                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
 996                 /* next state */
 997                 port->sm_rx_state = AD_RX_PORT_DISABLED;
 998         // check if new lacpdu arrived
 999         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1000                 port->sm_rx_timer_counter = 0; // zero timer
1001                 port->sm_rx_state = AD_RX_CURRENT;
1002         } else {
1003                 // if timer is on, and if it is expired
1004                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1005                         switch (port->sm_rx_state) {
1006                         case AD_RX_EXPIRED:
1007                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1008                                 break;
1009                         case AD_RX_CURRENT:
1010                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1011                                 break;
1012                         default:    //to silence the compiler
1013                                 break;
1014                         }
1015                 } else {
1016                         // if no lacpdu arrived and no timer is on
1017                         switch (port->sm_rx_state) {
1018                         case AD_RX_PORT_DISABLED:
1019                                 if (port->sm_vars & AD_PORT_MOVED)
1020                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1021                                 else if (port->is_enabled
1022                                          && (port->sm_vars
1023                                              & AD_PORT_LACP_ENABLED))
1024                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1025                                 else if (port->is_enabled
1026                                          && ((port->sm_vars
1027                                               & AD_PORT_LACP_ENABLED) == 0))
1028                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1029                                 break;
1030                         default:    //to silence the compiler
1031                                 break;
1032
1033                         }
1034                 }
1035         }
1036
1037         // check if the State machine was changed or new lacpdu arrived
1038         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1039                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1040                          port->actor_port_number, last_state,
1041                          port->sm_rx_state);
1042                 switch (port->sm_rx_state) {
1043                 case AD_RX_INITIALIZE:
1044                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1045                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1046                         else
1047                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1048                         port->sm_vars &= ~AD_PORT_SELECTED;
1049                         __record_default(port);
1050                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1051                         port->sm_vars &= ~AD_PORT_MOVED;
1052                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1053
1054                         /*- Fall Through -*/
1055
1056                 case AD_RX_PORT_DISABLED:
1057                         port->sm_vars &= ~AD_PORT_MATCHED;
1058                         break;
1059                 case AD_RX_LACP_DISABLED:
1060                         port->sm_vars &= ~AD_PORT_SELECTED;
1061                         __record_default(port);
1062                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1063                         port->sm_vars |= AD_PORT_MATCHED;
1064                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1065                         break;
1066                 case AD_RX_EXPIRED:
1067                         //Reset of the Synchronization flag. (Standard 43.4.12)
1068                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1069                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1070                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1071                         port->sm_vars &= ~AD_PORT_MATCHED;
1072                         port->partner_oper.port_state |=
1073                                 AD_STATE_LACP_ACTIVITY;
1074                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1075                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1076                         break;
1077                 case AD_RX_DEFAULTED:
1078                         __update_default_selected(port);
1079                         __record_default(port);
1080                         port->sm_vars |= AD_PORT_MATCHED;
1081                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1082                         break;
1083                 case AD_RX_CURRENT:
1084                         /* detect loopback situation */
1085                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system), &(port->actor_system))) {
1086                                 pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
1087                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1088                                        port->slave->bond->dev->name, port->slave->dev->name);
1089                                 return;
1090                         }
1091                         __update_selected(lacpdu, port);
1092                         __update_ntt(lacpdu, port);
1093                         __record_pdu(lacpdu, port);
1094                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1095                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1096                         break;
1097                 default:    /* to silence the compiler */
1098                         break;
1099                 }
1100         }
1101 }
1102
1103 /**
1104  * ad_tx_machine - handle a port's tx state machine
1105  * @port: the port we're looking at
1106  *
1107  */
1108 static void ad_tx_machine(struct port *port)
1109 {
1110         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1111         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1112                 // check if there is something to send
1113                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1114                         __update_lacpdu_from_port(port);
1115
1116                         if (ad_lacpdu_send(port) >= 0) {
1117                                 pr_debug("Sent LACPDU on port %d\n",
1118                                          port->actor_port_number);
1119
1120                                 /* mark ntt as false, so it will not be sent again until
1121                                    demanded */
1122                                 port->ntt = false;
1123                         }
1124                 }
1125                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1126                 port->sm_tx_timer_counter =
1127                         ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1128         }
1129 }
1130
1131 /**
1132  * ad_periodic_machine - handle a port's periodic state machine
1133  * @port: the port we're looking at
1134  *
1135  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1136  */
1137 static void ad_periodic_machine(struct port *port)
1138 {
1139         periodic_states_t last_state;
1140
1141         // keep current state machine state to compare later if it was changed
1142         last_state = port->sm_periodic_state;
1143
1144         // check if port was reinitialized
1145         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1146             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1147            ) {
1148                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1149         }
1150         // check if state machine should change state
1151         else if (port->sm_periodic_timer_counter) {
1152                 // check if periodic state machine expired
1153                 if (!(--port->sm_periodic_timer_counter)) {
1154                         // if expired then do tx
1155                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1156                 } else {
1157                         // If not expired, check if there is some new timeout parameter from the partner state
1158                         switch (port->sm_periodic_state) {
1159                         case AD_FAST_PERIODIC:
1160                                 if (!(port->partner_oper.port_state
1161                                       & AD_STATE_LACP_TIMEOUT))
1162                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1163                                 break;
1164                         case AD_SLOW_PERIODIC:
1165                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1166                                         // stop current timer
1167                                         port->sm_periodic_timer_counter = 0;
1168                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1169                                 }
1170                                 break;
1171                         default:    //to silence the compiler
1172                                 break;
1173                         }
1174                 }
1175         } else {
1176                 switch (port->sm_periodic_state) {
1177                 case AD_NO_PERIODIC:
1178                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1179                         break;
1180                 case AD_PERIODIC_TX:
1181                         if (!(port->partner_oper.port_state
1182                               & AD_STATE_LACP_TIMEOUT))
1183                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1184                         else
1185                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1186                         break;
1187                 default:    //to silence the compiler
1188                         break;
1189                 }
1190         }
1191
1192         // check if the state machine was changed
1193         if (port->sm_periodic_state != last_state) {
1194                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1195                          port->actor_port_number, last_state,
1196                          port->sm_periodic_state);
1197                 switch (port->sm_periodic_state) {
1198                 case AD_NO_PERIODIC:
1199                         port->sm_periodic_timer_counter = 0;       // zero timer
1200                         break;
1201                 case AD_FAST_PERIODIC:
1202                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1203                         break;
1204                 case AD_SLOW_PERIODIC:
1205                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1206                         break;
1207                 case AD_PERIODIC_TX:
1208                         port->ntt = true;
1209                         break;
1210                 default:    //to silence the compiler
1211                         break;
1212                 }
1213         }
1214 }
1215
1216 /**
1217  * ad_port_selection_logic - select aggregation groups
1218  * @port: the port we're looking at
1219  *
1220  * Select aggregation groups, and assign each port for it's aggregetor. The
1221  * selection logic is called in the inititalization (after all the handshkes),
1222  * and after every lacpdu receive (if selected is off).
1223  */
1224 static void ad_port_selection_logic(struct port *port)
1225 {
1226         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1227         struct port *last_port = NULL, *curr_port;
1228         struct list_head *iter;
1229         struct bonding *bond;
1230         struct slave *slave;
1231         int found = 0;
1232
1233         // if the port is already Selected, do nothing
1234         if (port->sm_vars & AD_PORT_SELECTED)
1235                 return;
1236
1237         bond = __get_bond_by_port(port);
1238
1239         // if the port is connected to other aggregator, detach it
1240         if (port->aggregator) {
1241                 // detach the port from its former aggregator
1242                 temp_aggregator = port->aggregator;
1243                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1244                      last_port = curr_port,
1245                              curr_port = curr_port->next_port_in_aggregator) {
1246                         if (curr_port == port) {
1247                                 temp_aggregator->num_of_ports--;
1248                                 if (!last_port) {// if it is the first port attached to the aggregator
1249                                         temp_aggregator->lag_ports =
1250                                                 port->next_port_in_aggregator;
1251                                 } else {// not the first port attached to the aggregator
1252                                         last_port->next_port_in_aggregator =
1253                                                 port->next_port_in_aggregator;
1254                                 }
1255
1256                                 // clear the port's relations to this aggregator
1257                                 port->aggregator = NULL;
1258                                 port->next_port_in_aggregator = NULL;
1259                                 port->actor_port_aggregator_identifier = 0;
1260
1261                                 pr_debug("Port %d left LAG %d\n",
1262                                          port->actor_port_number,
1263                                          temp_aggregator->aggregator_identifier);
1264                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1265                                 if (!temp_aggregator->lag_ports)
1266                                         ad_clear_agg(temp_aggregator);
1267                                 break;
1268                         }
1269                 }
1270                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1271                         pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1272                                    port->slave->bond->dev->name,
1273                                    port->actor_port_number,
1274                                    port->slave->dev->name,
1275                                    port->aggregator->aggregator_identifier);
1276                 }
1277         }
1278         // search on all aggregators for a suitable aggregator for this port
1279         bond_for_each_slave(bond, slave, iter) {
1280                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1281
1282                 // keep a free aggregator for later use(if needed)
1283                 if (!aggregator->lag_ports) {
1284                         if (!free_aggregator)
1285                                 free_aggregator = aggregator;
1286                         continue;
1287                 }
1288                 /* check if current aggregator suits us */
1289                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1290                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1291                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1292                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1293                     ) &&
1294                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1295                       !aggregator->is_individual)  /* but is not individual OR */
1296                     )
1297                    ) {
1298                         /* attach to the founded aggregator */
1299                         port->aggregator = aggregator;
1300                         port->actor_port_aggregator_identifier =
1301                                 port->aggregator->aggregator_identifier;
1302                         port->next_port_in_aggregator = aggregator->lag_ports;
1303                         port->aggregator->num_of_ports++;
1304                         aggregator->lag_ports = port;
1305                         pr_debug("Port %d joined LAG %d(existing LAG)\n",
1306                                  port->actor_port_number,
1307                                  port->aggregator->aggregator_identifier);
1308
1309                         // mark this port as selected
1310                         port->sm_vars |= AD_PORT_SELECTED;
1311                         found = 1;
1312                         break;
1313                 }
1314         }
1315
1316         // the port couldn't find an aggregator - attach it to a new aggregator
1317         if (!found) {
1318                 if (free_aggregator) {
1319                         // assign port a new aggregator
1320                         port->aggregator = free_aggregator;
1321                         port->actor_port_aggregator_identifier =
1322                                 port->aggregator->aggregator_identifier;
1323
1324                         // update the new aggregator's parameters
1325                         // if port was responsed from the end-user
1326                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1327                                 /* if port is full duplex */
1328                                 port->aggregator->is_individual = false;
1329                         else
1330                                 port->aggregator->is_individual = true;
1331
1332                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1333                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1334                         port->aggregator->partner_system =
1335                                 port->partner_oper.system;
1336                         port->aggregator->partner_system_priority =
1337                                 port->partner_oper.system_priority;
1338                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1339                         port->aggregator->receive_state = 1;
1340                         port->aggregator->transmit_state = 1;
1341                         port->aggregator->lag_ports = port;
1342                         port->aggregator->num_of_ports++;
1343
1344                         // mark this port as selected
1345                         port->sm_vars |= AD_PORT_SELECTED;
1346
1347                         pr_debug("Port %d joined LAG %d(new LAG)\n",
1348                                  port->actor_port_number,
1349                                  port->aggregator->aggregator_identifier);
1350                 } else {
1351                         pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1352                                port->slave->bond->dev->name,
1353                                port->actor_port_number, port->slave->dev->name);
1354                 }
1355         }
1356         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1357         // else set ready=FALSE in all aggregator's ports
1358         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1359
1360         aggregator = __get_first_agg(port);
1361         ad_agg_selection_logic(aggregator);
1362 }
1363
1364 /*
1365  * Decide if "agg" is a better choice for the new active aggregator that
1366  * the current best, according to the ad_select policy.
1367  */
1368 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1369                                                 struct aggregator *curr)
1370 {
1371         /*
1372          * 0. If no best, select current.
1373          *
1374          * 1. If the current agg is not individual, and the best is
1375          *    individual, select current.
1376          *
1377          * 2. If current agg is individual and the best is not, keep best.
1378          *
1379          * 3. Therefore, current and best are both individual or both not
1380          *    individual, so:
1381          *
1382          * 3a. If current agg partner replied, and best agg partner did not,
1383          *     select current.
1384          *
1385          * 3b. If current agg partner did not reply and best agg partner
1386          *     did reply, keep best.
1387          *
1388          * 4.  Therefore, current and best both have partner replies or
1389          *     both do not, so perform selection policy:
1390          *
1391          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1392          *     select by bandwidth.
1393          *
1394          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1395          */
1396         if (!best)
1397                 return curr;
1398
1399         if (!curr->is_individual && best->is_individual)
1400                 return curr;
1401
1402         if (curr->is_individual && !best->is_individual)
1403                 return best;
1404
1405         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1406                 return curr;
1407
1408         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1409                 return best;
1410
1411         switch (__get_agg_selection_mode(curr->lag_ports)) {
1412         case BOND_AD_COUNT:
1413                 if (curr->num_of_ports > best->num_of_ports)
1414                         return curr;
1415
1416                 if (curr->num_of_ports < best->num_of_ports)
1417                         return best;
1418
1419                 /*FALLTHROUGH*/
1420         case BOND_AD_STABLE:
1421         case BOND_AD_BANDWIDTH:
1422                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1423                         return curr;
1424
1425                 break;
1426
1427         default:
1428                 pr_warning("%s: Impossible agg select mode %d\n",
1429                            curr->slave->bond->dev->name,
1430                            __get_agg_selection_mode(curr->lag_ports));
1431                 break;
1432         }
1433
1434         return best;
1435 }
1436
1437 static int agg_device_up(const struct aggregator *agg)
1438 {
1439         struct port *port = agg->lag_ports;
1440         if (!port)
1441                 return 0;
1442         return (netif_running(port->slave->dev) &&
1443                 netif_carrier_ok(port->slave->dev));
1444 }
1445
1446 /**
1447  * ad_agg_selection_logic - select an aggregation group for a team
1448  * @aggregator: the aggregator we're looking at
1449  *
1450  * It is assumed that only one aggregator may be selected for a team.
1451  *
1452  * The logic of this function is to select the aggregator according to
1453  * the ad_select policy:
1454  *
1455  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1456  * it, and to reselect the active aggregator only if the previous
1457  * aggregator has no more ports related to it.
1458  *
1459  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1460  * bandwidth, and reselect whenever a link state change takes place or the
1461  * set of slaves in the bond changes.
1462  *
1463  * BOND_AD_COUNT: select the aggregator with largest number of ports
1464  * (slaves), and reselect whenever a link state change takes place or the
1465  * set of slaves in the bond changes.
1466  *
1467  * FIXME: this function MUST be called with the first agg in the bond, or
1468  * __get_active_agg() won't work correctly. This function should be better
1469  * called with the bond itself, and retrieve the first agg from it.
1470  */
1471 static void ad_agg_selection_logic(struct aggregator *agg)
1472 {
1473         struct aggregator *best, *active, *origin;
1474         struct bonding *bond = agg->slave->bond;
1475         struct list_head *iter;
1476         struct slave *slave;
1477         struct port *port;
1478
1479         origin = agg;
1480         active = __get_active_agg(agg);
1481         best = (active && agg_device_up(active)) ? active : NULL;
1482
1483         rcu_read_lock();
1484         bond_for_each_slave_rcu(bond, slave, iter) {
1485                 agg = &(SLAVE_AD_INFO(slave).aggregator);
1486
1487                 agg->is_active = 0;
1488
1489                 if (agg->num_of_ports && agg_device_up(agg))
1490                         best = ad_agg_selection_test(best, agg);
1491         }
1492
1493         if (best &&
1494             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1495                 /*
1496                  * For the STABLE policy, don't replace the old active
1497                  * aggregator if it's still active (it has an answering
1498                  * partner) or if both the best and active don't have an
1499                  * answering partner.
1500                  */
1501                 if (active && active->lag_ports &&
1502                     active->lag_ports->is_enabled &&
1503                     (__agg_has_partner(active) ||
1504                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1505                         if (!(!active->actor_oper_aggregator_key &&
1506                               best->actor_oper_aggregator_key)) {
1507                                 best = NULL;
1508                                 active->is_active = 1;
1509                         }
1510                 }
1511         }
1512
1513         if (best && (best == active)) {
1514                 best = NULL;
1515                 active->is_active = 1;
1516         }
1517
1518         /* if there is new best aggregator, activate it */
1519         if (best) {
1520                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1521                          best->aggregator_identifier, best->num_of_ports,
1522                          best->actor_oper_aggregator_key,
1523                          best->partner_oper_aggregator_key,
1524                          best->is_individual, best->is_active);
1525                 pr_debug("best ports %p slave %p %s\n",
1526                          best->lag_ports, best->slave,
1527                          best->slave ? best->slave->dev->name : "NULL");
1528
1529                 bond_for_each_slave_rcu(bond, slave, iter) {
1530                         agg = &(SLAVE_AD_INFO(slave).aggregator);
1531
1532                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1533                                  agg->aggregator_identifier, agg->num_of_ports,
1534                                  agg->actor_oper_aggregator_key,
1535                                  agg->partner_oper_aggregator_key,
1536                                  agg->is_individual, agg->is_active);
1537                 }
1538
1539                 /* check if any partner replys */
1540                 if (best->is_individual) {
1541                         pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1542                                 best->slave ?
1543                                 best->slave->bond->dev->name : "NULL");
1544                 }
1545
1546                 best->is_active = 1;
1547                 pr_debug("LAG %d chosen as the active LAG\n",
1548                          best->aggregator_identifier);
1549                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1550                          best->aggregator_identifier, best->num_of_ports,
1551                          best->actor_oper_aggregator_key,
1552                          best->partner_oper_aggregator_key,
1553                          best->is_individual, best->is_active);
1554
1555                 /* disable the ports that were related to the former active_aggregator */
1556                 if (active) {
1557                         for (port = active->lag_ports; port;
1558                              port = port->next_port_in_aggregator) {
1559                                 __disable_port(port);
1560                         }
1561                 }
1562         }
1563
1564         /*
1565          * if the selected aggregator is of join individuals
1566          * (partner_system is NULL), enable their ports
1567          */
1568         active = __get_active_agg(origin);
1569
1570         if (active) {
1571                 if (!__agg_has_partner(active)) {
1572                         for (port = active->lag_ports; port;
1573                              port = port->next_port_in_aggregator) {
1574                                 __enable_port(port);
1575                         }
1576                 }
1577         }
1578
1579         rcu_read_unlock();
1580
1581         bond_3ad_set_carrier(bond);
1582 }
1583
1584 /**
1585  * ad_clear_agg - clear a given aggregator's parameters
1586  * @aggregator: the aggregator we're looking at
1587  *
1588  */
1589 static void ad_clear_agg(struct aggregator *aggregator)
1590 {
1591         if (aggregator) {
1592                 aggregator->is_individual = false;
1593                 aggregator->actor_admin_aggregator_key = 0;
1594                 aggregator->actor_oper_aggregator_key = 0;
1595                 aggregator->partner_system = null_mac_addr;
1596                 aggregator->partner_system_priority = 0;
1597                 aggregator->partner_oper_aggregator_key = 0;
1598                 aggregator->receive_state = 0;
1599                 aggregator->transmit_state = 0;
1600                 aggregator->lag_ports = NULL;
1601                 aggregator->is_active = 0;
1602                 aggregator->num_of_ports = 0;
1603                 pr_debug("LAG %d was cleared\n",
1604                          aggregator->aggregator_identifier);
1605         }
1606 }
1607
1608 /**
1609  * ad_initialize_agg - initialize a given aggregator's parameters
1610  * @aggregator: the aggregator we're looking at
1611  *
1612  */
1613 static void ad_initialize_agg(struct aggregator *aggregator)
1614 {
1615         if (aggregator) {
1616                 ad_clear_agg(aggregator);
1617
1618                 aggregator->aggregator_mac_address = null_mac_addr;
1619                 aggregator->aggregator_identifier = 0;
1620                 aggregator->slave = NULL;
1621         }
1622 }
1623
1624 /**
1625  * ad_initialize_port - initialize a given port's parameters
1626  * @aggregator: the aggregator we're looking at
1627  * @lacp_fast: boolean. whether fast periodic should be used
1628  *
1629  */
1630 static void ad_initialize_port(struct port *port, int lacp_fast)
1631 {
1632         static const struct port_params tmpl = {
1633                 .system_priority = 0xffff,
1634                 .key             = 1,
1635                 .port_number     = 1,
1636                 .port_priority   = 0xff,
1637                 .port_state      = 1,
1638         };
1639         static const struct lacpdu lacpdu = {
1640                 .subtype                = 0x01,
1641                 .version_number = 0x01,
1642                 .tlv_type_actor_info = 0x01,
1643                 .actor_information_length = 0x14,
1644                 .tlv_type_partner_info = 0x02,
1645                 .partner_information_length = 0x14,
1646                 .tlv_type_collector_info = 0x03,
1647                 .collector_information_length = 0x10,
1648                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1649         };
1650
1651         if (port) {
1652                 port->actor_port_number = 1;
1653                 port->actor_port_priority = 0xff;
1654                 port->actor_system = null_mac_addr;
1655                 port->actor_system_priority = 0xffff;
1656                 port->actor_port_aggregator_identifier = 0;
1657                 port->ntt = false;
1658                 port->actor_admin_port_key = 1;
1659                 port->actor_oper_port_key  = 1;
1660                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1661                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1662
1663                 if (lacp_fast)
1664                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1665
1666                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1667                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1668
1669                 port->is_enabled = true;
1670                 // ****** private parameters ******
1671                 port->sm_vars = 0x3;
1672                 port->sm_rx_state = 0;
1673                 port->sm_rx_timer_counter = 0;
1674                 port->sm_periodic_state = 0;
1675                 port->sm_periodic_timer_counter = 0;
1676                 port->sm_mux_state = 0;
1677                 port->sm_mux_timer_counter = 0;
1678                 port->sm_tx_state = 0;
1679                 port->sm_tx_timer_counter = 0;
1680                 port->slave = NULL;
1681                 port->aggregator = NULL;
1682                 port->next_port_in_aggregator = NULL;
1683                 port->transaction_id = 0;
1684
1685                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1686         }
1687 }
1688
1689 /**
1690  * ad_enable_collecting_distributing - enable a port's transmit/receive
1691  * @port: the port we're looking at
1692  *
1693  * Enable @port if it's in an active aggregator
1694  */
1695 static void ad_enable_collecting_distributing(struct port *port)
1696 {
1697         if (port->aggregator->is_active) {
1698                 pr_debug("Enabling port %d(LAG %d)\n",
1699                          port->actor_port_number,
1700                          port->aggregator->aggregator_identifier);
1701                 __enable_port(port);
1702         }
1703 }
1704
1705 /**
1706  * ad_disable_collecting_distributing - disable a port's transmit/receive
1707  * @port: the port we're looking at
1708  *
1709  */
1710 static void ad_disable_collecting_distributing(struct port *port)
1711 {
1712         if (port->aggregator && !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system), &(null_mac_addr))) {
1713                 pr_debug("Disabling port %d(LAG %d)\n",
1714                          port->actor_port_number,
1715                          port->aggregator->aggregator_identifier);
1716                 __disable_port(port);
1717         }
1718 }
1719
1720 #if 0
1721 /**
1722  * ad_marker_info_send - send a marker information frame
1723  * @port: the port we're looking at
1724  *
1725  * This function does nothing since we decided not to implement send and handle
1726  * response for marker PDU's, in this stage, but only to respond to marker
1727  * information.
1728  */
1729 static void ad_marker_info_send(struct port *port)
1730 {
1731         struct bond_marker marker;
1732         u16 index;
1733
1734         // fill the marker PDU with the appropriate values
1735         marker.subtype = 0x02;
1736         marker.version_number = 0x01;
1737         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1738         marker.marker_length = 0x16;
1739         // convert requester_port to Big Endian
1740         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1741         marker.requester_system = port->actor_system;
1742         // convert requester_port(u32) to Big Endian
1743         marker.requester_transaction_id =
1744                 (((++port->transaction_id & 0xFF) << 24)
1745                  | ((port->transaction_id & 0xFF00) << 8)
1746                  | ((port->transaction_id & 0xFF0000) >> 8)
1747                  | ((port->transaction_id & 0xFF000000) >> 24));
1748         marker.pad = 0;
1749         marker.tlv_type_terminator = 0x00;
1750         marker.terminator_length = 0x00;
1751         for (index = 0; index < 90; index++)
1752                 marker.reserved_90[index] = 0;
1753
1754         // send the marker information
1755         if (ad_marker_send(port, &marker) >= 0) {
1756                 pr_debug("Sent Marker Information on port %d\n",
1757                          port->actor_port_number);
1758         }
1759 }
1760 #endif
1761
1762 /**
1763  * ad_marker_info_received - handle receive of a Marker information frame
1764  * @marker_info: Marker info received
1765  * @port: the port we're looking at
1766  *
1767  */
1768 static void ad_marker_info_received(struct bond_marker *marker_info,
1769         struct port *port)
1770 {
1771         struct bond_marker marker;
1772
1773         // copy the received marker data to the response marker
1774         //marker = *marker_info;
1775         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1776         // change the marker subtype to marker response
1777         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1778         // send the marker response
1779
1780         if (ad_marker_send(port, &marker) >= 0) {
1781                 pr_debug("Sent Marker Response on port %d\n",
1782                          port->actor_port_number);
1783         }
1784 }
1785
1786 /**
1787  * ad_marker_response_received - handle receive of a marker response frame
1788  * @marker: marker PDU received
1789  * @port: the port we're looking at
1790  *
1791  * This function does nothing since we decided not to implement send and handle
1792  * response for marker PDU's, in this stage, but only to respond to marker
1793  * information.
1794  */
1795 static void ad_marker_response_received(struct bond_marker *marker,
1796         struct port *port)
1797 {
1798         marker = NULL; /* just to satisfy the compiler */
1799         port = NULL;  /* just to satisfy the compiler */
1800         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1801 }
1802
1803 //////////////////////////////////////////////////////////////////////////////////////
1804 // ================= AD exported functions to the main bonding code ==================
1805 //////////////////////////////////////////////////////////////////////////////////////
1806
1807 // Check aggregators status in team every T seconds
1808 #define AD_AGGREGATOR_SELECTION_TIMER  8
1809
1810 /*
1811  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1812  *
1813  * Set the aggregation selection timer, to initiate an agg selection in
1814  * the very near future.  Called during first initialization, and during
1815  * any down to up transitions of the bond.
1816  */
1817 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1818 {
1819         BOND_AD_INFO(bond).agg_select_timer = timeout;
1820 }
1821
1822 static u16 aggregator_identifier;
1823
1824 /**
1825  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1826  * @bond: bonding struct to work on
1827  * @tick_resolution: tick duration (millisecond resolution)
1828  *
1829  * Can be called only after the mac address of the bond is set.
1830  */
1831 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1832 {
1833         /* check that the bond is not initialized yet */
1834         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1835                                 bond->dev->dev_addr)) {
1836
1837                 aggregator_identifier = 0;
1838
1839                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1840                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1841
1842                 // initialize how many times this module is called in one second(should be about every 100ms)
1843                 ad_ticks_per_sec = tick_resolution;
1844
1845                 bond_3ad_initiate_agg_selection(bond,
1846                                                 AD_AGGREGATOR_SELECTION_TIMER *
1847                                                 ad_ticks_per_sec);
1848         }
1849 }
1850
1851 /**
1852  * bond_3ad_bind_slave - initialize a slave's port
1853  * @slave: slave struct to work on
1854  *
1855  * Returns:   0 on success
1856  *          < 0 on error
1857  */
1858 void bond_3ad_bind_slave(struct slave *slave)
1859 {
1860         struct bonding *bond = bond_get_bond_by_slave(slave);
1861         struct port *port;
1862         struct aggregator *aggregator;
1863
1864         /* check that the slave has not been initialized yet. */
1865         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1866
1867                 /* port initialization */
1868                 port = &(SLAVE_AD_INFO(slave).port);
1869
1870                 ad_initialize_port(port, bond->params.lacp_fast);
1871
1872                 __initialize_port_locks(slave);
1873                 port->slave = slave;
1874                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1875                 /* key is determined according to the link speed, duplex and user key(which
1876                  * is yet not supported)
1877                  *              ------------------------------------------------------------
1878                  * Port key :   | User key                       |      Speed       |Duplex|
1879                  *              ------------------------------------------------------------
1880                  *              16                               6               1 0
1881                  */
1882                 port->actor_admin_port_key = 0; /* initialize this parameter */
1883                 port->actor_admin_port_key |= __get_duplex(port);
1884                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1885                 port->actor_oper_port_key = port->actor_admin_port_key;
1886                 /* if the port is not full duplex, then the port should be not lacp Enabled */
1887                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1888                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1889                 /* actor system is the bond's system */
1890                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1891                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second) */
1892                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1893                 port->aggregator = NULL;
1894                 port->next_port_in_aggregator = NULL;
1895
1896                 __disable_port(port);
1897
1898                 /* aggregator initialization */
1899                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1900
1901                 ad_initialize_agg(aggregator);
1902
1903                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1904                 aggregator->aggregator_identifier = (++aggregator_identifier);
1905                 aggregator->slave = slave;
1906                 aggregator->is_active = 0;
1907                 aggregator->num_of_ports = 0;
1908         }
1909 }
1910
1911 /**
1912  * bond_3ad_unbind_slave - deinitialize a slave's port
1913  * @slave: slave struct to work on
1914  *
1915  * Search for the aggregator that is related to this port, remove the
1916  * aggregator and assign another aggregator for other port related to it
1917  * (if any), and remove the port.
1918  */
1919 void bond_3ad_unbind_slave(struct slave *slave)
1920 {
1921         struct port *port, *prev_port, *temp_port;
1922         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1923         int select_new_active_agg = 0;
1924         struct bonding *bond = slave->bond;
1925         struct slave *slave_iter;
1926         struct list_head *iter;
1927
1928         // find the aggregator related to this slave
1929         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1930
1931         // find the port related to this slave
1932         port = &(SLAVE_AD_INFO(slave).port);
1933
1934         // if slave is null, the whole port is not initialized
1935         if (!port->slave) {
1936                 pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1937                            slave->bond->dev->name, slave->dev->name);
1938                 return;
1939         }
1940
1941         pr_debug("Unbinding Link Aggregation Group %d\n",
1942                  aggregator->aggregator_identifier);
1943
1944         /* Tell the partner that this port is not suitable for aggregation */
1945         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1946         __update_lacpdu_from_port(port);
1947         ad_lacpdu_send(port);
1948
1949         // check if this aggregator is occupied
1950         if (aggregator->lag_ports) {
1951                 // check if there are other ports related to this aggregator except
1952                 // the port related to this slave(thats ensure us that there is a
1953                 // reason to search for new aggregator, and that we will find one
1954                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1955                         // find new aggregator for the related port(s)
1956                         bond_for_each_slave(bond, slave_iter, iter) {
1957                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
1958                                 // if the new aggregator is empty, or it is connected to our port only
1959                                 if (!new_aggregator->lag_ports
1960                                     || ((new_aggregator->lag_ports == port)
1961                                         && !new_aggregator->lag_ports->next_port_in_aggregator))
1962                                         break;
1963                         }
1964                         if (!slave_iter)
1965                                 new_aggregator = NULL;
1966                         // if new aggregator found, copy the aggregator's parameters
1967                         // and connect the related lag_ports to the new aggregator
1968                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1969                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
1970                                          aggregator->aggregator_identifier,
1971                                          new_aggregator->aggregator_identifier);
1972
1973                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1974                                         pr_info("%s: Removing an active aggregator\n",
1975                                                 aggregator->slave->bond->dev->name);
1976                                         // select new active aggregator
1977                                          select_new_active_agg = 1;
1978                                 }
1979
1980                                 new_aggregator->is_individual = aggregator->is_individual;
1981                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1982                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1983                                 new_aggregator->partner_system = aggregator->partner_system;
1984                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1985                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1986                                 new_aggregator->receive_state = aggregator->receive_state;
1987                                 new_aggregator->transmit_state = aggregator->transmit_state;
1988                                 new_aggregator->lag_ports = aggregator->lag_ports;
1989                                 new_aggregator->is_active = aggregator->is_active;
1990                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
1991
1992                                 // update the information that is written on the ports about the aggregator
1993                                 for (temp_port = aggregator->lag_ports; temp_port;
1994                                      temp_port = temp_port->next_port_in_aggregator) {
1995                                         temp_port->aggregator = new_aggregator;
1996                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1997                                 }
1998
1999                                 // clear the aggregator
2000                                 ad_clear_agg(aggregator);
2001
2002                                 if (select_new_active_agg)
2003                                         ad_agg_selection_logic(__get_first_agg(port));
2004                         } else {
2005                                 pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
2006                                            slave->bond->dev->name);
2007                         }
2008                 } else { // in case that the only port related to this aggregator is the one we want to remove
2009                         select_new_active_agg = aggregator->is_active;
2010                         // clear the aggregator
2011                         ad_clear_agg(aggregator);
2012                         if (select_new_active_agg) {
2013                                 pr_info("%s: Removing an active aggregator\n",
2014                                         slave->bond->dev->name);
2015                                 // select new active aggregator
2016                                 temp_aggregator = __get_first_agg(port);
2017                                 if (temp_aggregator)
2018                                         ad_agg_selection_logic(temp_aggregator);
2019                         }
2020                 }
2021         }
2022
2023         pr_debug("Unbinding port %d\n", port->actor_port_number);
2024         // find the aggregator that this port is connected to
2025         bond_for_each_slave(bond, slave_iter, iter) {
2026                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
2027                 prev_port = NULL;
2028                 // search the port in the aggregator's related ports
2029                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2030                      prev_port = temp_port,
2031                              temp_port = temp_port->next_port_in_aggregator) {
2032                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2033                                 if (prev_port)
2034                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2035                                 else
2036                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2037                                 temp_aggregator->num_of_ports--;
2038                                 if (temp_aggregator->num_of_ports == 0) {
2039                                         select_new_active_agg = temp_aggregator->is_active;
2040                                         // clear the aggregator
2041                                         ad_clear_agg(temp_aggregator);
2042                                         if (select_new_active_agg) {
2043                                                 pr_info("%s: Removing an active aggregator\n",
2044                                                         slave->bond->dev->name);
2045                                                 // select new active aggregator
2046                                                 ad_agg_selection_logic(__get_first_agg(port));
2047                                         }
2048                                 }
2049                                 break;
2050                         }
2051                 }
2052         }
2053         port->slave = NULL;
2054 }
2055
2056 /**
2057  * bond_3ad_state_machine_handler - handle state machines timeout
2058  * @bond: bonding struct to work on
2059  *
2060  * The state machine handling concept in this module is to check every tick
2061  * which state machine should operate any function. The execution order is
2062  * round robin, so when we have an interaction between state machines, the
2063  * reply of one to each other might be delayed until next tick.
2064  *
2065  * This function also complete the initialization when the agg_select_timer
2066  * times out, and it selects an aggregator for the ports that are yet not
2067  * related to any aggregator, and selects the active aggregator for a bond.
2068  */
2069 void bond_3ad_state_machine_handler(struct work_struct *work)
2070 {
2071         struct bonding *bond = container_of(work, struct bonding,
2072                                             ad_work.work);
2073         struct aggregator *aggregator;
2074         struct list_head *iter;
2075         struct slave *slave;
2076         struct port *port;
2077
2078         read_lock(&bond->lock);
2079         rcu_read_lock();
2080
2081         /* check if there are any slaves */
2082         if (!bond_has_slaves(bond))
2083                 goto re_arm;
2084
2085         /* check if agg_select_timer timer after initialize is timed out */
2086         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2087                 slave = bond_first_slave_rcu(bond);
2088                 port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
2089
2090                 /* select the active aggregator for the bond */
2091                 if (port) {
2092                         if (!port->slave) {
2093                                 pr_warning("%s: Warning: bond's first port is uninitialized\n",
2094                                            bond->dev->name);
2095                                 goto re_arm;
2096                         }
2097
2098                         aggregator = __get_first_agg(port);
2099                         ad_agg_selection_logic(aggregator);
2100                 }
2101                 bond_3ad_set_carrier(bond);
2102         }
2103
2104         /* for each port run the state machines */
2105         bond_for_each_slave_rcu(bond, slave, iter) {
2106                 port = &(SLAVE_AD_INFO(slave).port);
2107                 if (!port->slave) {
2108                         pr_warning("%s: Warning: Found an uninitialized port\n",
2109                                    bond->dev->name);
2110                         goto re_arm;
2111                 }
2112
2113                 /* Lock around state machines to protect data accessed
2114                  * by all (e.g., port->sm_vars).  ad_rx_machine may run
2115                  * concurrently due to incoming LACPDU.
2116                  */
2117                 __get_state_machine_lock(port);
2118
2119                 ad_rx_machine(NULL, port);
2120                 ad_periodic_machine(port);
2121                 ad_port_selection_logic(port);
2122                 ad_mux_machine(port);
2123                 ad_tx_machine(port);
2124
2125                 /* turn off the BEGIN bit, since we already handled it */
2126                 if (port->sm_vars & AD_PORT_BEGIN)
2127                         port->sm_vars &= ~AD_PORT_BEGIN;
2128
2129                 __release_state_machine_lock(port);
2130         }
2131
2132 re_arm:
2133         rcu_read_unlock();
2134         read_unlock(&bond->lock);
2135         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2136 }
2137
2138 /**
2139  * bond_3ad_rx_indication - handle a received frame
2140  * @lacpdu: received lacpdu
2141  * @slave: slave struct to work on
2142  * @length: length of the data received
2143  *
2144  * It is assumed that frames that were sent on this NIC don't returned as new
2145  * received frames (loopback). Since only the payload is given to this
2146  * function, it check for loopback.
2147  */
2148 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2149 {
2150         struct port *port;
2151         int ret = RX_HANDLER_ANOTHER;
2152
2153         if (length >= sizeof(struct lacpdu)) {
2154
2155                 port = &(SLAVE_AD_INFO(slave).port);
2156
2157                 if (!port->slave) {
2158                         pr_warning("%s: Warning: port of slave %s is uninitialized\n",
2159                                    slave->dev->name, slave->bond->dev->name);
2160                         return ret;
2161                 }
2162
2163                 switch (lacpdu->subtype) {
2164                 case AD_TYPE_LACPDU:
2165                         ret = RX_HANDLER_CONSUMED;
2166                         pr_debug("Received LACPDU on port %d\n",
2167                                  port->actor_port_number);
2168                         /* Protect against concurrent state machines */
2169                         __get_state_machine_lock(port);
2170                         ad_rx_machine(lacpdu, port);
2171                         __release_state_machine_lock(port);
2172                         break;
2173
2174                 case AD_TYPE_MARKER:
2175                         ret = RX_HANDLER_CONSUMED;
2176                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2177
2178                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2179                         case AD_MARKER_INFORMATION_SUBTYPE:
2180                                 pr_debug("Received Marker Information on port %d\n",
2181                                          port->actor_port_number);
2182                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2183                                 break;
2184
2185                         case AD_MARKER_RESPONSE_SUBTYPE:
2186                                 pr_debug("Received Marker Response on port %d\n",
2187                                          port->actor_port_number);
2188                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2189                                 break;
2190
2191                         default:
2192                                 pr_debug("Received an unknown Marker subtype on slot %d\n",
2193                                          port->actor_port_number);
2194                         }
2195                 }
2196         }
2197         return ret;
2198 }
2199
2200 /**
2201  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2202  * @slave: slave struct to work on
2203  *
2204  * Handle reselection of aggregator (if needed) for this port.
2205  */
2206 void bond_3ad_adapter_speed_changed(struct slave *slave)
2207 {
2208         struct port *port;
2209
2210         port = &(SLAVE_AD_INFO(slave).port);
2211
2212         // if slave is null, the whole port is not initialized
2213         if (!port->slave) {
2214                 pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
2215                            slave->bond->dev->name, slave->dev->name);
2216                 return;
2217         }
2218
2219         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2220         port->actor_oper_port_key = port->actor_admin_port_key |=
2221                 (__get_link_speed(port) << 1);
2222         pr_debug("Port %d changed speed\n", port->actor_port_number);
2223         // there is no need to reselect a new aggregator, just signal the
2224         // state machines to reinitialize
2225         port->sm_vars |= AD_PORT_BEGIN;
2226 }
2227
2228 /**
2229  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2230  * @slave: slave struct to work on
2231  *
2232  * Handle reselection of aggregator (if needed) for this port.
2233  */
2234 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2235 {
2236         struct port *port;
2237
2238         port = &(SLAVE_AD_INFO(slave).port);
2239
2240         // if slave is null, the whole port is not initialized
2241         if (!port->slave) {
2242                 pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
2243                            slave->bond->dev->name, slave->dev->name);
2244                 return;
2245         }
2246
2247         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2248         port->actor_oper_port_key = port->actor_admin_port_key |=
2249                 __get_duplex(port);
2250         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2251         // there is no need to reselect a new aggregator, just signal the
2252         // state machines to reinitialize
2253         port->sm_vars |= AD_PORT_BEGIN;
2254 }
2255
2256 /**
2257  * bond_3ad_handle_link_change - handle a slave's link status change indication
2258  * @slave: slave struct to work on
2259  * @status: whether the link is now up or down
2260  *
2261  * Handle reselection of aggregator (if needed) for this port.
2262  */
2263 void bond_3ad_handle_link_change(struct slave *slave, char link)
2264 {
2265         struct port *port;
2266
2267         port = &(SLAVE_AD_INFO(slave).port);
2268
2269         // if slave is null, the whole port is not initialized
2270         if (!port->slave) {
2271                 pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
2272                            slave->bond->dev->name, slave->dev->name);
2273                 return;
2274         }
2275
2276         // on link down we are zeroing duplex and speed since some of the adaptors(ce1000.lan) report full duplex/speed instead of N/A(duplex) / 0(speed)
2277         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2278         if (link == BOND_LINK_UP) {
2279                 port->is_enabled = true;
2280                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2281                 port->actor_oper_port_key = port->actor_admin_port_key |=
2282                         __get_duplex(port);
2283                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2284                 port->actor_oper_port_key = port->actor_admin_port_key |=
2285                         (__get_link_speed(port) << 1);
2286         } else {
2287                 /* link has failed */
2288                 port->is_enabled = false;
2289                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2290                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2291                                              ~AD_SPEED_KEY_BITS);
2292         }
2293         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2294         // there is no need to reselect a new aggregator, just signal the
2295         // state machines to reinitialize
2296         port->sm_vars |= AD_PORT_BEGIN;
2297 }
2298
2299 /*
2300  * set link state for bonding master: if we have an active
2301  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2302  * have an active aggregator if there are no slaves with link up.
2303  *
2304  * This behavior complies with IEEE 802.3 section 43.3.9.
2305  *
2306  * Called by bond_set_carrier(). Return zero if carrier state does not
2307  * change, nonzero if it does.
2308  */
2309 int bond_3ad_set_carrier(struct bonding *bond)
2310 {
2311         struct aggregator *active;
2312         struct slave *first_slave;
2313
2314         rcu_read_lock();
2315         first_slave = bond_first_slave_rcu(bond);
2316         rcu_read_unlock();
2317         if (!first_slave)
2318                 return 0;
2319         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
2320         if (active) {
2321                 /* are enough slaves available to consider link up? */
2322                 if (active->num_of_ports < bond->params.min_links) {
2323                         if (netif_carrier_ok(bond->dev)) {
2324                                 netif_carrier_off(bond->dev);
2325                                 return 1;
2326                         }
2327                 } else if (!netif_carrier_ok(bond->dev)) {
2328                         netif_carrier_on(bond->dev);
2329                         return 1;
2330                 }
2331                 return 0;
2332         }
2333
2334         if (netif_carrier_ok(bond->dev)) {
2335                 netif_carrier_off(bond->dev);
2336                 return 1;
2337         }
2338         return 0;
2339 }
2340
2341 /**
2342  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2343  * @bond: bonding struct to work on
2344  * @ad_info: ad_info struct to fill with the bond's info
2345  *
2346  * Returns:   0 on success
2347  *          < 0 on error
2348  */
2349 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2350                                    struct ad_info *ad_info)
2351 {
2352         struct aggregator *aggregator = NULL;
2353         struct list_head *iter;
2354         struct slave *slave;
2355         struct port *port;
2356
2357         bond_for_each_slave_rcu(bond, slave, iter) {
2358                 port = &(SLAVE_AD_INFO(slave).port);
2359                 if (port->aggregator && port->aggregator->is_active) {
2360                         aggregator = port->aggregator;
2361                         break;
2362                 }
2363         }
2364
2365         if (aggregator) {
2366                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2367                 ad_info->ports = aggregator->num_of_ports;
2368                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2369                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2370                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2371                 return 0;
2372         }
2373
2374         return -1;
2375 }
2376
2377 /* Wrapper used to hold bond->lock so no slave manipulation can occur */
2378 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2379 {
2380         int ret;
2381
2382         rcu_read_lock();
2383         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2384         rcu_read_unlock();
2385
2386         return ret;
2387 }
2388
2389 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2390 {
2391         struct bonding *bond = netdev_priv(dev);
2392         struct slave *slave, *first_ok_slave;
2393         struct aggregator *agg;
2394         struct ad_info ad_info;
2395         struct list_head *iter;
2396         int slaves_in_agg;
2397         int slave_agg_no;
2398         int agg_id;
2399
2400         if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2401                 pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
2402                          dev->name);
2403                 goto err_free;
2404         }
2405
2406         slaves_in_agg = ad_info.ports;
2407         agg_id = ad_info.aggregator_id;
2408
2409         if (slaves_in_agg == 0) {
2410                 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2411                 goto err_free;
2412         }
2413
2414         slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
2415         first_ok_slave = NULL;
2416
2417         bond_for_each_slave_rcu(bond, slave, iter) {
2418                 agg = SLAVE_AD_INFO(slave).port.aggregator;
2419                 if (!agg || agg->aggregator_identifier != agg_id)
2420                         continue;
2421
2422                 if (slave_agg_no >= 0) {
2423                         if (!first_ok_slave && SLAVE_IS_OK(slave))
2424                                 first_ok_slave = slave;
2425                         slave_agg_no--;
2426                         continue;
2427                 }
2428
2429                 if (SLAVE_IS_OK(slave)) {
2430                         bond_dev_queue_xmit(bond, skb, slave->dev);
2431                         goto out;
2432                 }
2433         }
2434
2435         if (slave_agg_no >= 0) {
2436                 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2437                        dev->name, agg_id);
2438                 goto err_free;
2439         }
2440
2441         /* we couldn't find any suitable slave after the agg_no, so use the
2442          * first suitable found, if found. */
2443         if (first_ok_slave)
2444                 bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2445         else
2446                 goto err_free;
2447
2448 out:
2449         return NETDEV_TX_OK;
2450 err_free:
2451         /* no suitable interface, frame not sent */
2452         kfree_skb(skb);
2453         goto out;
2454 }
2455
2456 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2457                          struct slave *slave)
2458 {
2459         int ret = RX_HANDLER_ANOTHER;
2460         struct lacpdu *lacpdu, _lacpdu;
2461
2462         if (skb->protocol != PKT_TYPE_LACPDU)
2463                 return ret;
2464
2465         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2466         if (!lacpdu)
2467                 return ret;
2468
2469         read_lock(&bond->lock);
2470         ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
2471         read_unlock(&bond->lock);
2472         return ret;
2473 }
2474
2475 /*
2476  * When modify lacp_rate parameter via sysfs,
2477  * update actor_oper_port_state of each port.
2478  *
2479  * Hold slave->state_machine_lock,
2480  * so we can modify port->actor_oper_port_state,
2481  * no matter bond is up or down.
2482  */
2483 void bond_3ad_update_lacp_rate(struct bonding *bond)
2484 {
2485         struct port *port = NULL;
2486         struct list_head *iter;
2487         struct slave *slave;
2488         int lacp_fast;
2489
2490         lacp_fast = bond->params.lacp_fast;
2491         bond_for_each_slave(bond, slave, iter) {
2492                 port = &(SLAVE_AD_INFO(slave).port);
2493                 __get_state_machine_lock(port);
2494                 if (lacp_fast)
2495                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2496                 else
2497                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2498                 __release_state_machine_lock(port);
2499         }
2500 }