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_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
  95
  96 static struct mac_addr null_mac_addr = { { 0, 0, 0, 0, 0, 0 } };
  97 static u16 ad_ticks_per_sec;
  98 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  99
 100 static const u8 lacpdu_mcast_addr[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 101
 102 // ================= main 802.3ad protocol functions ==================
 103 static int ad_lacpdu_send(struct port *port);
 104 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 105 static void ad_mux_machine(struct port *port);
 106 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 107 static void ad_tx_machine(struct port *port);
 108 static void ad_periodic_machine(struct port *port);
 109 static void ad_port_selection_logic(struct port *port);
 110 static void ad_agg_selection_logic(struct aggregator *aggregator);
 111 static void ad_clear_agg(struct aggregator *aggregator);
 112 static void ad_initialize_agg(struct aggregator *aggregator);
 113 static void ad_initialize_port(struct port *port, int lacp_fast);
 114 static void ad_enable_collecting_distributing(struct port *port);
 115 static void ad_disable_collecting_distributing(struct port *port);
 116 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
 117 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
 118
 119
 120 /////////////////////////////////////////////////////////////////////////////////
 121 // ================= api to bonding and kernel code ==================
 122 /////////////////////////////////////////////////////////////////////////////////
 123
 124 /**
 125  * __get_bond_by_port - get the port's bonding struct
 126  * @port: the port we're looking at
 127  *
 128  * Return @port's bonding struct, or %NULL if it can't be found.
 129  */
 130 static inline struct bonding *__get_bond_by_port(struct port *port)
 131 {
 132         if (port->slave == NULL)
 133                 return NULL;
 134
 135         return bond_get_bond_by_slave(port->slave);
 136 }
 137
 138 /**
 139  * __get_first_agg - get the first aggregator in the bond
 140  * @bond: the bond we're looking at
 141  *
 142  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 143  * found.
 144  */
 145 static inline struct aggregator *__get_first_agg(struct port *port)
 146 {
 147         struct bonding *bond = __get_bond_by_port(port);
 148         struct slave *first_slave;
 149
 150         /* If there's no bond for this port, or bond has no slaves */
 151         if (bond == NULL)
 152                 return NULL;
 153         rcu_read_lock();
 154         first_slave = bond_first_slave_rcu(bond);
 155         rcu_read_unlock();
 156         return first_slave ? &(SLAVE_AD_INFO(first_slave).aggregator) : NULL;
 157 }
 158
 159 /*
 160  * __agg_has_partner
 161  *
 162  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 163  * address for the partner).  Return 0 if not.
 164  */
 165 static inline int __agg_has_partner(struct aggregator *agg)
 166 {
 167         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 168 }
 169
 170 /**
 171  * __disable_port - disable the port's slave
 172  * @port: the port we're looking at
 173  *
 174  */
 175 static inline void __disable_port(struct port *port)
 176 {
 177         bond_set_slave_inactive_flags(port->slave);
 178 }
 179
 180 /**
 181  * __enable_port - enable the port's slave, if it's up
 182  * @port: the port we're looking at
 183  *
 184  */
 185 static inline void __enable_port(struct port *port)
 186 {
 187         struct slave *slave = port->slave;
 188
 189         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev))
 190                 bond_set_slave_active_flags(slave);
 191 }
 192
 193 /**
 194  * __port_is_enabled - check if the port's slave is in active state
 195  * @port: the port we're looking at
 196  *
 197  */
 198 static inline int __port_is_enabled(struct port *port)
 199 {
 200         return bond_is_active_slave(port->slave);
 201 }
 202
 203 /**
 204  * __get_agg_selection_mode - get the aggregator selection mode
 205  * @port: the port we're looking at
 206  *
 207  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 208  */
 209 static inline u32 __get_agg_selection_mode(struct port *port)
 210 {
 211         struct bonding *bond = __get_bond_by_port(port);
 212
 213         if (bond == NULL)
 214                 return BOND_AD_STABLE;
 215
 216         return bond->params.ad_select;
 217 }
 218
 219 /**
 220  * __check_agg_selection_timer - check if the selection timer has expired
 221  * @port: the port we're looking at
 222  *
 223  */
 224 static inline int __check_agg_selection_timer(struct port *port)
 225 {
 226         struct bonding *bond = __get_bond_by_port(port);
 227
 228         if (bond == NULL)
 229                 return 0;
 230
 231         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 232 }
 233
 234 /**
 235  * __get_state_machine_lock - lock the port's state machines
 236  * @port: the port we're looking at
 237  *
 238  */
 239 static inline void __get_state_machine_lock(struct port *port)
 240 {
 241         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 242 }
 243
 244 /**
 245  * __release_state_machine_lock - unlock the port's state machines
 246  * @port: the port we're looking at
 247  *
 248  */
 249 static inline void __release_state_machine_lock(struct port *port)
 250 {
 251         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).state_machine_lock));
 252 }
 253
 254 /**
 255  * __get_link_speed - get a port's speed
 256  * @port: the port we're looking at
 257  *
 258  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
 259  *     0,
 260  *     %AD_LINK_SPEED_BITMASK_10MBPS,
 261  *     %AD_LINK_SPEED_BITMASK_100MBPS,
 262  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
 263  *     %AD_LINK_SPEED_BITMASK_10000MBPS
 264  */
 265 static u16 __get_link_speed(struct port *port)
 266 {
 267         struct slave *slave = port->slave;
 268         u16 speed;
 269
 270         /* this if covers only a special case: when the configuration starts with
 271          * link down, it sets the speed to 0.
 272          * This is done in spite of the fact that the e100 driver reports 0 to be
 273          * compatible with MVT in the future.*/
 274         if (slave->link != BOND_LINK_UP)
 275                 speed = 0;
 276         else {
 277                 switch (slave->speed) {
 278                 case SPEED_10:
 279                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
 280                         break;
 281
 282                 case SPEED_100:
 283                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
 284                         break;
 285
 286                 case SPEED_1000:
 287                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
 288                         break;
 289
 290                 case SPEED_10000:
 291                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
 292                         break;
 293
 294                 default:
 295                         speed = 0; // unknown speed value from ethtool. shouldn't happen
 296                         break;
 297                 }
 298         }
 299
 300         pr_debug("Port %d Received link speed %d update from adapter\n",
 301                  port->actor_port_number, speed);
 302         return speed;
 303 }
 304
 305 /**
 306  * __get_duplex - get a port's duplex
 307  * @port: the port we're looking at
 308  *
 309  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 310  *     0x01 if in full duplex
 311  *     0x00 otherwise
 312  */
 313 static u8 __get_duplex(struct port *port)
 314 {
 315         struct slave *slave = port->slave;
 316
 317         u8 retval;
 318
 319         //  handling a special case: when the configuration starts with
 320         // link down, it sets the duplex to 0.
 321         if (slave->link != BOND_LINK_UP)
 322                 retval = 0x0;
 323         else {
 324                 switch (slave->duplex) {
 325                 case DUPLEX_FULL:
 326                         retval = 0x1;
 327                         pr_debug("Port %d Received status full duplex update from adapter\n",
 328                                  port->actor_port_number);
 329                         break;
 330                 case DUPLEX_HALF:
 331                 default:
 332                         retval = 0x0;
 333                         pr_debug("Port %d Received status NOT full duplex update from adapter\n",
 334                                  port->actor_port_number);
 335                         break;
 336                 }
 337         }
 338         return retval;
 339 }
 340
 341 /**
 342  * __initialize_port_locks - initialize a port's STATE machine spinlock
 343  * @port: the slave of the port we're looking at
 344  *
 345  */
 346 static inline void __initialize_port_locks(struct slave *slave)
 347 {
 348         // make sure it isn't called twice
 349         spin_lock_init(&(SLAVE_AD_INFO(slave).state_machine_lock));
 350 }
 351
 352 //conversions
 353
 354 /**
 355  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 356  * @timer_type: which timer to operate
 357  * @par: timer parameter. see below
 358  *
 359  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 360  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 361  *                                                  %SLOW_PERIODIC_TIME.
 362  */
 363 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 364 {
 365         u16 retval = 0; /* to silence the compiler */
 366
 367         switch (timer_type) {
 368         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
 369                 if (par)
 370                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
 371                 else
 372                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
 373                 break;
 374         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
 375                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 376                 break;
 377         case AD_PERIODIC_TIMER:     // for periodic machine
 378                 retval = (par*ad_ticks_per_sec); // long timeout
 379                 break;
 380         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
 381                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 382                 break;
 383         case AD_WAIT_WHILE_TIMER:           // for selection machine
 384                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 385                 break;
 386         }
 387         return retval;
 388 }
 389
 390
 391 /////////////////////////////////////////////////////////////////////////////////
 392 // ================= ad_rx_machine helper functions ==================
 393 /////////////////////////////////////////////////////////////////////////////////
 394
 395 /**
 396  * __choose_matched - update a port's matched variable from a received lacpdu
 397  * @lacpdu: the lacpdu we've received
 398  * @port: the port we're looking at
 399  *
 400  * Update the value of the matched variable, using parameter values from a
 401  * newly received lacpdu. Parameter values for the partner carried in the
 402  * received PDU are compared with the corresponding operational parameter
 403  * values for the actor. Matched is set to TRUE if all of these parameters
 404  * match and the PDU parameter partner_state.aggregation has the same value as
 405  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 406  * in the aggregation. Matched is also set to TRUE if the value of
 407  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 408  * an individual link and lacp will actively maintain the link. Otherwise,
 409  * matched is set to FALSE. LACP is considered to be actively maintaining the
 410  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 411  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 412  * partner_state.lacp_activity variables are TRUE.
 413  *
 414  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 415  * used here to implement the language from 802.3ad 43.4.9 that requires
 416  * recordPDU to "match" the LACPDU parameters to the stored values.
 417  */
 418 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 419 {
 420         // check if all parameters are alike
 421         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 422              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 423              !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
 424              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 425              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 426              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 427             // or this is individual link(aggregation == FALSE)
 428             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 429                 ) {
 430                 // update the state machine Matched variable
 431                 port->sm_vars |= AD_PORT_MATCHED;
 432         } else {
 433                 port->sm_vars &= ~AD_PORT_MATCHED;
 434         }
 435 }
 436
 437 /**
 438  * __record_pdu - record parameters from a received lacpdu
 439  * @lacpdu: the lacpdu we've received
 440  * @port: the port we're looking at
 441  *
 442  * Record the parameter values for the Actor carried in a received lacpdu as
 443  * the current partner operational parameter values and sets
 444  * actor_oper_port_state.defaulted to FALSE.
 445  */
 446 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 447 {
 448         if (lacpdu && port) {
 449                 struct port_params *partner = &port->partner_oper;
 450
 451                 __choose_matched(lacpdu, port);
 452                 // record the new parameter values for the partner operational
 453                 partner->port_number = ntohs(lacpdu->actor_port);
 454                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 455                 partner->system = lacpdu->actor_system;
 456                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 457                 partner->key = ntohs(lacpdu->actor_key);
 458                 partner->port_state = lacpdu->actor_state;
 459
 460                 // set actor_oper_port_state.defaulted to FALSE
 461                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 462
 463                 // set the partner sync. to on if the partner is sync. and the port is matched
 464                 if ((port->sm_vars & AD_PORT_MATCHED)
 465                     && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION))
 466                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 467                 else
 468                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 469         }
 470 }
 471
 472 /**
 473  * __record_default - record default parameters
 474  * @port: the port we're looking at
 475  *
 476  * This function records the default parameter values for the partner carried
 477  * in the Partner Admin parameters as the current partner operational parameter
 478  * values and sets actor_oper_port_state.defaulted to TRUE.
 479  */
 480 static void __record_default(struct port *port)
 481 {
 482         if (port) {
 483                 // record the partner admin parameters
 484                 memcpy(&port->partner_oper, &port->partner_admin,
 485                        sizeof(struct port_params));
 486
 487                 // set actor_oper_port_state.defaulted to true
 488                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 489         }
 490 }
 491
 492 /**
 493  * __update_selected - update a port's Selected variable from a received lacpdu
 494  * @lacpdu: the lacpdu we've received
 495  * @port: the port we're looking at
 496  *
 497  * Update the value of the selected variable, using parameter values from a
 498  * newly received lacpdu. The parameter values for the Actor carried in the
 499  * received PDU are compared with the corresponding operational parameter
 500  * values for the ports partner. If one or more of the comparisons shows that
 501  * the value(s) received in the PDU differ from the current operational values,
 502  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 503  * set to out_of_sync. Otherwise, selected remains unchanged.
 504  */
 505 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 506 {
 507         if (lacpdu && port) {
 508                 const struct port_params *partner = &port->partner_oper;
 509
 510                 // check if any parameter is different
 511                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 512                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 513                     MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system) ||
 514                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 515                     ntohs(lacpdu->actor_key) != partner->key ||
 516                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 517                         // update the state machine Selected variable
 518                         port->sm_vars &= ~AD_PORT_SELECTED;
 519                 }
 520         }
 521 }
 522
 523 /**
 524  * __update_default_selected - update a port's Selected variable from Partner
 525  * @port: the port we're looking at
 526  *
 527  * This function updates the value of the selected variable, using the partner
 528  * administrative parameter values. The administrative values are compared with
 529  * the corresponding operational parameter values for the partner. If one or
 530  * more of the comparisons shows that the administrative value(s) differ from
 531  * the current operational values, then Selected is set to FALSE and
 532  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 533  * Selected remains unchanged.
 534  */
 535 static void __update_default_selected(struct port *port)
 536 {
 537         if (port) {
 538                 const struct port_params *admin = &port->partner_admin;
 539                 const struct port_params *oper = &port->partner_oper;
 540
 541                 // check if any parameter is different
 542                 if (admin->port_number != oper->port_number ||
 543                     admin->port_priority != oper->port_priority ||
 544                     MAC_ADDRESS_COMPARE(&admin->system, &oper->system) ||
 545                     admin->system_priority != oper->system_priority ||
 546                     admin->key != oper->key ||
 547                     (admin->port_state & AD_STATE_AGGREGATION)
 548                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 549                         // update the state machine Selected variable
 550                         port->sm_vars &= ~AD_PORT_SELECTED;
 551                 }
 552         }
 553 }
 554
 555 /**
 556  * __update_ntt - update a port's ntt variable from a received lacpdu
 557  * @lacpdu: the lacpdu we've received
 558  * @port: the port we're looking at
 559  *
 560  * Updates the value of the ntt variable, using parameter values from a newly
 561  * received lacpdu. The parameter values for the partner carried in the
 562  * received PDU are compared with the corresponding operational parameter
 563  * values for the Actor. If one or more of the comparisons shows that the
 564  * value(s) received in the PDU differ from the current operational values,
 565  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 566  */
 567 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 568 {
 569         // validate lacpdu and port
 570         if (lacpdu && port) {
 571                 // check if any parameter is different
 572                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 573                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 574                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
 575                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 576                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 577                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 578                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 579                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 580                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 581                    ) {
 582
 583                         port->ntt = true;
 584                 }
 585         }
 586 }
 587
 588 /**
 589  * __attach_bond_to_agg
 590  * @port: the port we're looking at
 591  *
 592  * Handle the attaching of the port's control parser/multiplexer and the
 593  * aggregator. This function does nothing since the parser/multiplexer of the
 594  * receive and the parser/multiplexer of the aggregator are already combined.
 595  */
 596 static void __attach_bond_to_agg(struct port *port)
 597 {
 598         port = NULL; /* just to satisfy the compiler */
 599         // This function does nothing since the parser/multiplexer of the receive
 600         // and the parser/multiplexer of the aggregator are already combined
 601 }
 602
 603 /**
 604  * __detach_bond_from_agg
 605  * @port: the port we're looking at
 606  *
 607  * Handle the detaching of the port's control parser/multiplexer from the
 608  * aggregator. This function does nothing since the parser/multiplexer of the
 609  * receive and the parser/multiplexer of the aggregator are already combined.
 610  */
 611 static void __detach_bond_from_agg(struct port *port)
 612 {
 613         port = NULL; /* just to satisfy the compiler */
 614         // This function does nothing since the parser/multiplexer of the receive
 615         // and the parser/multiplexer of the aggregator are already combined
 616 }
 617
 618 /**
 619  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 620  * @aggregator: the aggregator we're looking at
 621  *
 622  */
 623 static int __agg_ports_are_ready(struct aggregator *aggregator)
 624 {
 625         struct port *port;
 626         int retval = 1;
 627
 628         if (aggregator) {
 629                 // scan all ports in this aggregator to verfy if they are all ready
 630                 for (port = aggregator->lag_ports;
 631                      port;
 632                      port = port->next_port_in_aggregator) {
 633                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 634                                 retval = 0;
 635                                 break;
 636                         }
 637                 }
 638         }
 639
 640         return retval;
 641 }
 642
 643 /**
 644  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 645  * @aggregator: the aggregator we're looking at
 646  * @val: Should the ports' ready bit be set on or off
 647  *
 648  */
 649 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 650 {
 651         struct port *port;
 652
 653         for (port = aggregator->lag_ports; port;
 654              port = port->next_port_in_aggregator) {
 655                 if (val)
 656                         port->sm_vars |= AD_PORT_READY;
 657                 else
 658                         port->sm_vars &= ~AD_PORT_READY;
 659         }
 660 }
 661
 662 /**
 663  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 664  * @aggregator: the aggregator we're looking at
 665  *
 666  */
 667 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 668 {
 669         u32 bandwidth = 0;
 670
 671         if (aggregator->num_of_ports) {
 672                 switch (__get_link_speed(aggregator->lag_ports)) {
 673                 case AD_LINK_SPEED_BITMASK_1MBPS:
 674                         bandwidth = aggregator->num_of_ports;
 675                         break;
 676                 case AD_LINK_SPEED_BITMASK_10MBPS:
 677                         bandwidth = aggregator->num_of_ports * 10;
 678                         break;
 679                 case AD_LINK_SPEED_BITMASK_100MBPS:
 680                         bandwidth = aggregator->num_of_ports * 100;
 681                         break;
 682                 case AD_LINK_SPEED_BITMASK_1000MBPS:
 683                         bandwidth = aggregator->num_of_ports * 1000;
 684                         break;
 685                 case AD_LINK_SPEED_BITMASK_10000MBPS:
 686                         bandwidth = aggregator->num_of_ports * 10000;
 687                         break;
 688                 default:
 689                         bandwidth = 0; /*to silence the compiler ....*/
 690                 }
 691         }
 692         return bandwidth;
 693 }
 694
 695 /**
 696  * __get_active_agg - get the current active aggregator
 697  * @aggregator: the aggregator we're looking at
 698  *
 699  */
 700 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 701 {
 702         struct bonding *bond = aggregator->slave->bond;
 703         struct list_head *iter;
 704         struct slave *slave;
 705
 706         rcu_read_lock();
 707         bond_for_each_slave_rcu(bond, slave, iter)
 708                 if (SLAVE_AD_INFO(slave).aggregator.is_active) {
 709                         rcu_read_unlock();
 710                         return &(SLAVE_AD_INFO(slave).aggregator);
 711                 }
 712         rcu_read_unlock();
 713
 714         return NULL;
 715 }
 716
 717 /**
 718  * __update_lacpdu_from_port - update a port's lacpdu fields
 719  * @port: the port we're looking at
 720  *
 721  */
 722 static inline void __update_lacpdu_from_port(struct port *port)
 723 {
 724         struct lacpdu *lacpdu = &port->lacpdu;
 725         const struct port_params *partner = &port->partner_oper;
 726
 727         /* update current actual Actor parameters */
 728         /* lacpdu->subtype                   initialized
 729          * lacpdu->version_number            initialized
 730          * lacpdu->tlv_type_actor_info       initialized
 731          * lacpdu->actor_information_length  initialized
 732          */
 733
 734         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 735         lacpdu->actor_system = port->actor_system;
 736         lacpdu->actor_key = htons(port->actor_oper_port_key);
 737         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 738         lacpdu->actor_port = htons(port->actor_port_number);
 739         lacpdu->actor_state = port->actor_oper_port_state;
 740
 741         /* lacpdu->reserved_3_1              initialized
 742          * lacpdu->tlv_type_partner_info     initialized
 743          * lacpdu->partner_information_length initialized
 744          */
 745
 746         lacpdu->partner_system_priority = htons(partner->system_priority);
 747         lacpdu->partner_system = partner->system;
 748         lacpdu->partner_key = htons(partner->key);
 749         lacpdu->partner_port_priority = htons(partner->port_priority);
 750         lacpdu->partner_port = htons(partner->port_number);
 751         lacpdu->partner_state = partner->port_state;
 752
 753         /* lacpdu->reserved_3_2              initialized
 754          * lacpdu->tlv_type_collector_info   initialized
 755          * lacpdu->collector_information_length initialized
 756          * collector_max_delay                initialized
 757          * reserved_12[12]                   initialized
 758          * tlv_type_terminator               initialized
 759          * terminator_length                 initialized
 760          * reserved_50[50]                   initialized
 761          */
 762 }
 763
 764 //////////////////////////////////////////////////////////////////////////////////////
 765 // ================= main 802.3ad protocol code ======================================
 766 //////////////////////////////////////////////////////////////////////////////////////
 767
 768 /**
 769  * ad_lacpdu_send - send out a lacpdu packet on a given port
 770  * @port: the port we're looking at
 771  *
 772  * Returns:   0 on success
 773  *          < 0 on error
 774  */
 775 static int ad_lacpdu_send(struct port *port)
 776 {
 777         struct slave *slave = port->slave;
 778         struct sk_buff *skb;
 779         struct lacpdu_header *lacpdu_header;
 780         int length = sizeof(struct lacpdu_header);
 781
 782         skb = dev_alloc_skb(length);
 783         if (!skb)
 784                 return -ENOMEM;
 785
 786         skb->dev = slave->dev;
 787         skb_reset_mac_header(skb);
 788         skb->network_header = skb->mac_header + ETH_HLEN;
 789         skb->protocol = PKT_TYPE_LACPDU;
 790         skb->priority = TC_PRIO_CONTROL;
 791
 792         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
 793
 794         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 795         /* Note: source address is set to be the member's PERMANENT address,
 796            because we use it to identify loopback lacpdus in receive. */
 797         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 798         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 799
 800         lacpdu_header->lacpdu = port->lacpdu; // struct copy
 801
 802         dev_queue_xmit(skb);
 803
 804         return 0;
 805 }
 806
 807 /**
 808  * ad_marker_send - send marker information/response on a given port
 809  * @port: the port we're looking at
 810  * @marker: marker data to send
 811  *
 812  * Returns:   0 on success
 813  *          < 0 on error
 814  */
 815 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 816 {
 817         struct slave *slave = port->slave;
 818         struct sk_buff *skb;
 819         struct bond_marker_header *marker_header;
 820         int length = sizeof(struct bond_marker_header);
 821
 822         skb = dev_alloc_skb(length + 16);
 823         if (!skb)
 824                 return -ENOMEM;
 825
 826         skb_reserve(skb, 16);
 827
 828         skb->dev = slave->dev;
 829         skb_reset_mac_header(skb);
 830         skb->network_header = skb->mac_header + ETH_HLEN;
 831         skb->protocol = PKT_TYPE_LACPDU;
 832
 833         marker_header = (struct bond_marker_header *)skb_put(skb, length);
 834
 835         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
 836         /* Note: source address is set to be the member's PERMANENT address,
 837            because we use it to identify loopback MARKERs in receive. */
 838         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
 839         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 840
 841         marker_header->marker = *marker; // struct copy
 842
 843         dev_queue_xmit(skb);
 844
 845         return 0;
 846 }
 847
 848 /**
 849  * ad_mux_machine - handle a port's mux state machine
 850  * @port: the port we're looking at
 851  *
 852  */
 853 static void ad_mux_machine(struct port *port)
 854 {
 855         mux_states_t last_state;
 856
 857         // keep current State Machine state to compare later if it was changed
 858         last_state = port->sm_mux_state;
 859
 860         if (port->sm_vars & AD_PORT_BEGIN) {
 861                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
 862         } else {
 863                 switch (port->sm_mux_state) {
 864                 case AD_MUX_DETACHED:
 865                         if ((port->sm_vars & AD_PORT_SELECTED)
 866                             || (port->sm_vars & AD_PORT_STANDBY))
 867                                 /* if SELECTED or STANDBY */
 868                                 port->sm_mux_state = AD_MUX_WAITING; // next state
 869                         break;
 870                 case AD_MUX_WAITING:
 871                         // if SELECTED == FALSE return to DETACH state
 872                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
 873                                 port->sm_vars &= ~AD_PORT_READY_N;
 874                                 // in order to withhold the Selection Logic to check all ports READY_N value
 875                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 876                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 877                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
 878                                 break;
 879                         }
 880
 881                         // check if the wait_while_timer expired
 882                         if (port->sm_mux_timer_counter
 883                             && !(--port->sm_mux_timer_counter))
 884                                 port->sm_vars |= AD_PORT_READY_N;
 885
 886                         // in order to withhold the selection logic to check all ports READY_N value
 887                         // every callback cycle to update ready variable, we check READY_N and update READY here
 888                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 889
 890                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
 891                         if ((port->sm_vars & AD_PORT_READY)
 892                             && !port->sm_mux_timer_counter)
 893                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
 894                         break;
 895                 case AD_MUX_ATTACHED:
 896                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
 897                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
 898                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
 899                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
 900                                 port->sm_vars &= ~AD_PORT_READY_N;
 901                                 // in order to withhold the selection logic to check all ports READY_N value
 902                                 // every callback cycle to update ready variable, we check READY_N and update READY here
 903                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 904                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
 905                         }
 906                         break;
 907                 case AD_MUX_COLLECTING_DISTRIBUTING:
 908                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
 909                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
 910                            ) {
 911                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
 912
 913                         } else {
 914                                 // if port state hasn't changed make
 915                                 // sure that a collecting distributing
 916                                 // port in an active aggregator is enabled
 917                                 if (port->aggregator &&
 918                                     port->aggregator->is_active &&
 919                                     !__port_is_enabled(port)) {
 920
 921                                         __enable_port(port);
 922                                 }
 923                         }
 924                         break;
 925                 default:    //to silence the compiler
 926                         break;
 927                 }
 928         }
 929
 930         // check if the state machine was changed
 931         if (port->sm_mux_state != last_state) {
 932                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
 933                          port->actor_port_number, last_state,
 934                          port->sm_mux_state);
 935                 switch (port->sm_mux_state) {
 936                 case AD_MUX_DETACHED:
 937                         __detach_bond_from_agg(port);
 938                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
 939                         ad_disable_collecting_distributing(port);
 940                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 941                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 942                         port->ntt = true;
 943                         break;
 944                 case AD_MUX_WAITING:
 945                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
 946                         break;
 947                 case AD_MUX_ATTACHED:
 948                         __attach_bond_to_agg(port);
 949                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
 950                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
 951                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
 952                         ad_disable_collecting_distributing(port);
 953                         port->ntt = true;
 954                         break;
 955                 case AD_MUX_COLLECTING_DISTRIBUTING:
 956                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
 957                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
 958                         ad_enable_collecting_distributing(port);
 959                         port->ntt = true;
 960                         break;
 961                 default:    //to silence the compiler
 962                         break;
 963                 }
 964         }
 965 }
 966
 967 /**
 968  * ad_rx_machine - handle a port's rx State Machine
 969  * @lacpdu: the lacpdu we've received
 970  * @port: the port we're looking at
 971  *
 972  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
 973  * CURRENT. If timer expired set the state machine in the proper state.
 974  * In other cases, this function checks if we need to switch to other state.
 975  */
 976 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
 977 {
 978         rx_states_t last_state;
 979
 980         // keep current State Machine state to compare later if it was changed
 981         last_state = port->sm_rx_state;
 982
 983         // check if state machine should change state
 984         // first, check if port was reinitialized
 985         if (port->sm_vars & AD_PORT_BEGIN)
 986                 /* next state */
 987                 port->sm_rx_state = AD_RX_INITIALIZE;
 988         // check if port is not enabled
 989         else if (!(port->sm_vars & AD_PORT_BEGIN)
 990                  && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED))
 991                 /* next state */
 992                 port->sm_rx_state = AD_RX_PORT_DISABLED;
 993         // check if new lacpdu arrived
 994         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
 995                 port->sm_rx_timer_counter = 0; // zero timer
 996                 port->sm_rx_state = AD_RX_CURRENT;
 997         } else {
 998                 // if timer is on, and if it is expired
 999                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1000                         switch (port->sm_rx_state) {
1001                         case AD_RX_EXPIRED:
1002                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1003                                 break;
1004                         case AD_RX_CURRENT:
1005                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1006                                 break;
1007                         default:    //to silence the compiler
1008                                 break;
1009                         }
1010                 } else {
1011                         // if no lacpdu arrived and no timer is on
1012                         switch (port->sm_rx_state) {
1013                         case AD_RX_PORT_DISABLED:
1014                                 if (port->sm_vars & AD_PORT_MOVED)
1015                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1016                                 else if (port->is_enabled
1017                                          && (port->sm_vars
1018                                              & AD_PORT_LACP_ENABLED))
1019                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1020                                 else if (port->is_enabled
1021                                          && ((port->sm_vars
1022                                               & AD_PORT_LACP_ENABLED) == 0))
1023                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1024                                 break;
1025                         default:    //to silence the compiler
1026                                 break;
1027
1028                         }
1029                 }
1030         }
1031
1032         // check if the State machine was changed or new lacpdu arrived
1033         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1034                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1035                          port->actor_port_number, last_state,
1036                          port->sm_rx_state);
1037                 switch (port->sm_rx_state) {
1038                 case AD_RX_INITIALIZE:
1039                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS))
1040                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1041                         else
1042                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1043                         port->sm_vars &= ~AD_PORT_SELECTED;
1044                         __record_default(port);
1045                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1046                         port->sm_vars &= ~AD_PORT_MOVED;
1047                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1048
1049                         /*- Fall Through -*/
1050
1051                 case AD_RX_PORT_DISABLED:
1052                         port->sm_vars &= ~AD_PORT_MATCHED;
1053                         break;
1054                 case AD_RX_LACP_DISABLED:
1055                         port->sm_vars &= ~AD_PORT_SELECTED;
1056                         __record_default(port);
1057                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1058                         port->sm_vars |= AD_PORT_MATCHED;
1059                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1060                         break;
1061                 case AD_RX_EXPIRED:
1062                         //Reset of the Synchronization flag. (Standard 43.4.12)
1063                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1064                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1065                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1066                         port->sm_vars &= ~AD_PORT_MATCHED;
1067                         port->partner_oper.port_state |=
1068                                 AD_STATE_LACP_ACTIVITY;
1069                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1070                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1071                         break;
1072                 case AD_RX_DEFAULTED:
1073                         __update_default_selected(port);
1074                         __record_default(port);
1075                         port->sm_vars |= AD_PORT_MATCHED;
1076                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1077                         break;
1078                 case AD_RX_CURRENT:
1079                         // detect loopback situation
1080                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1081                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1082                                 pr_err("%s: An illegal loopback occurred on adapter (%s).\n"
1083                                        "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n",
1084                                        port->slave->bond->dev->name, port->slave->dev->name);
1085                                 return;
1086                         }
1087                         __update_selected(lacpdu, port);
1088                         __update_ntt(lacpdu, port);
1089                         __record_pdu(lacpdu, port);
1090                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1091                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1092                         break;
1093                 default:    //to silence the compiler
1094                         break;
1095                 }
1096         }
1097 }
1098
1099 /**
1100  * ad_tx_machine - handle a port's tx state machine
1101  * @port: the port we're looking at
1102  *
1103  */
1104 static void ad_tx_machine(struct port *port)
1105 {
1106         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1107         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1108                 // check if there is something to send
1109                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1110                         __update_lacpdu_from_port(port);
1111
1112                         if (ad_lacpdu_send(port) >= 0) {
1113                                 pr_debug("Sent LACPDU on port %d\n",
1114                                          port->actor_port_number);
1115
1116                                 /* mark ntt as false, so it will not be sent again until
1117                                    demanded */
1118                                 port->ntt = false;
1119                         }
1120                 }
1121                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1122                 port->sm_tx_timer_counter =
1123                         ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1124         }
1125 }
1126
1127 /**
1128  * ad_periodic_machine - handle a port's periodic state machine
1129  * @port: the port we're looking at
1130  *
1131  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1132  */
1133 static void ad_periodic_machine(struct port *port)
1134 {
1135         periodic_states_t last_state;
1136
1137         // keep current state machine state to compare later if it was changed
1138         last_state = port->sm_periodic_state;
1139
1140         // check if port was reinitialized
1141         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1142             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1143            ) {
1144                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1145         }
1146         // check if state machine should change state
1147         else if (port->sm_periodic_timer_counter) {
1148                 // check if periodic state machine expired
1149                 if (!(--port->sm_periodic_timer_counter)) {
1150                         // if expired then do tx
1151                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1152                 } else {
1153                         // If not expired, check if there is some new timeout parameter from the partner state
1154                         switch (port->sm_periodic_state) {
1155                         case AD_FAST_PERIODIC:
1156                                 if (!(port->partner_oper.port_state
1157                                       & AD_STATE_LACP_TIMEOUT))
1158                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1159                                 break;
1160                         case AD_SLOW_PERIODIC:
1161                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1162                                         // stop current timer
1163                                         port->sm_periodic_timer_counter = 0;
1164                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1165                                 }
1166                                 break;
1167                         default:    //to silence the compiler
1168                                 break;
1169                         }
1170                 }
1171         } else {
1172                 switch (port->sm_periodic_state) {
1173                 case AD_NO_PERIODIC:
1174                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1175                         break;
1176                 case AD_PERIODIC_TX:
1177                         if (!(port->partner_oper.port_state
1178                               & AD_STATE_LACP_TIMEOUT))
1179                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1180                         else
1181                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1182                         break;
1183                 default:    //to silence the compiler
1184                         break;
1185                 }
1186         }
1187
1188         // check if the state machine was changed
1189         if (port->sm_periodic_state != last_state) {
1190                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1191                          port->actor_port_number, last_state,
1192                          port->sm_periodic_state);
1193                 switch (port->sm_periodic_state) {
1194                 case AD_NO_PERIODIC:
1195                         port->sm_periodic_timer_counter = 0;       // zero timer
1196                         break;
1197                 case AD_FAST_PERIODIC:
1198                         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
1199                         break;
1200                 case AD_SLOW_PERIODIC:
1201                         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
1202                         break;
1203                 case AD_PERIODIC_TX:
1204                         port->ntt = true;
1205                         break;
1206                 default:    //to silence the compiler
1207                         break;
1208                 }
1209         }
1210 }
1211
1212 /**
1213  * ad_port_selection_logic - select aggregation groups
1214  * @port: the port we're looking at
1215  *
1216  * Select aggregation groups, and assign each port for it's aggregetor. The
1217  * selection logic is called in the inititalization (after all the handshkes),
1218  * and after every lacpdu receive (if selected is off).
1219  */
1220 static void ad_port_selection_logic(struct port *port)
1221 {
1222         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1223         struct port *last_port = NULL, *curr_port;
1224         struct list_head *iter;
1225         struct bonding *bond;
1226         struct slave *slave;
1227         int found = 0;
1228
1229         // if the port is already Selected, do nothing
1230         if (port->sm_vars & AD_PORT_SELECTED)
1231                 return;
1232
1233         bond = __get_bond_by_port(port);
1234
1235         // if the port is connected to other aggregator, detach it
1236         if (port->aggregator) {
1237                 // detach the port from its former aggregator
1238                 temp_aggregator = port->aggregator;
1239                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1240                      last_port = curr_port,
1241                              curr_port = curr_port->next_port_in_aggregator) {
1242                         if (curr_port == port) {
1243                                 temp_aggregator->num_of_ports--;
1244                                 if (!last_port) {// if it is the first port attached to the aggregator
1245                                         temp_aggregator->lag_ports =
1246                                                 port->next_port_in_aggregator;
1247                                 } else {// not the first port attached to the aggregator
1248                                         last_port->next_port_in_aggregator =
1249                                                 port->next_port_in_aggregator;
1250                                 }
1251
1252                                 // clear the port's relations to this aggregator
1253                                 port->aggregator = NULL;
1254                                 port->next_port_in_aggregator = NULL;
1255                                 port->actor_port_aggregator_identifier = 0;
1256
1257                                 pr_debug("Port %d left LAG %d\n",
1258                                          port->actor_port_number,
1259                                          temp_aggregator->aggregator_identifier);
1260                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1261                                 if (!temp_aggregator->lag_ports)
1262                                         ad_clear_agg(temp_aggregator);
1263                                 break;
1264                         }
1265                 }
1266                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1267                         pr_warning("%s: Warning: Port %d (on %s) was related to aggregator %d but was not on its port list\n",
1268                                    port->slave->bond->dev->name,
1269                                    port->actor_port_number,
1270                                    port->slave->dev->name,
1271                                    port->aggregator->aggregator_identifier);
1272                 }
1273         }
1274         // search on all aggregators for a suitable aggregator for this port
1275         bond_for_each_slave(bond, slave, iter) {
1276                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1277
1278                 // keep a free aggregator for later use(if needed)
1279                 if (!aggregator->lag_ports) {
1280                         if (!free_aggregator)
1281                                 free_aggregator = aggregator;
1282                         continue;
1283                 }
1284                 // check if current aggregator suits us
1285                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1286                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1287                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1288                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1289                     ) &&
1290                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1291                       !aggregator->is_individual)  // but is not individual OR
1292                     )
1293                    ) {
1294                         // attach to the founded aggregator
1295                         port->aggregator = aggregator;
1296                         port->actor_port_aggregator_identifier =
1297                                 port->aggregator->aggregator_identifier;
1298                         port->next_port_in_aggregator = aggregator->lag_ports;
1299                         port->aggregator->num_of_ports++;
1300                         aggregator->lag_ports = port;
1301                         pr_debug("Port %d joined LAG %d(existing LAG)\n",
1302                                  port->actor_port_number,
1303                                  port->aggregator->aggregator_identifier);
1304
1305                         // mark this port as selected
1306                         port->sm_vars |= AD_PORT_SELECTED;
1307                         found = 1;
1308                         break;
1309                 }
1310         }
1311
1312         // the port couldn't find an aggregator - attach it to a new aggregator
1313         if (!found) {
1314                 if (free_aggregator) {
1315                         // assign port a new aggregator
1316                         port->aggregator = free_aggregator;
1317                         port->actor_port_aggregator_identifier =
1318                                 port->aggregator->aggregator_identifier;
1319
1320                         // update the new aggregator's parameters
1321                         // if port was responsed from the end-user
1322                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)
1323                                 /* if port is full duplex */
1324                                 port->aggregator->is_individual = false;
1325                         else
1326                                 port->aggregator->is_individual = true;
1327
1328                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1329                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1330                         port->aggregator->partner_system =
1331                                 port->partner_oper.system;
1332                         port->aggregator->partner_system_priority =
1333                                 port->partner_oper.system_priority;
1334                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1335                         port->aggregator->receive_state = 1;
1336                         port->aggregator->transmit_state = 1;
1337                         port->aggregator->lag_ports = port;
1338                         port->aggregator->num_of_ports++;
1339
1340                         // mark this port as selected
1341                         port->sm_vars |= AD_PORT_SELECTED;
1342
1343                         pr_debug("Port %d joined LAG %d(new LAG)\n",
1344                                  port->actor_port_number,
1345                                  port->aggregator->aggregator_identifier);
1346                 } else {
1347                         pr_err("%s: Port %d (on %s) did not find a suitable aggregator\n",
1348                                port->slave->bond->dev->name,
1349                                port->actor_port_number, port->slave->dev->name);
1350                 }
1351         }
1352         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1353         // else set ready=FALSE in all aggregator's ports
1354         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1355
1356         aggregator = __get_first_agg(port);
1357         ad_agg_selection_logic(aggregator);
1358 }
1359
1360 /*
1361  * Decide if "agg" is a better choice for the new active aggregator that
1362  * the current best, according to the ad_select policy.
1363  */
1364 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1365                                                 struct aggregator *curr)
1366 {
1367         /*
1368          * 0. If no best, select current.
1369          *
1370          * 1. If the current agg is not individual, and the best is
1371          *    individual, select current.
1372          *
1373          * 2. If current agg is individual and the best is not, keep best.
1374          *
1375          * 3. Therefore, current and best are both individual or both not
1376          *    individual, so:
1377          *
1378          * 3a. If current agg partner replied, and best agg partner did not,
1379          *     select current.
1380          *
1381          * 3b. If current agg partner did not reply and best agg partner
1382          *     did reply, keep best.
1383          *
1384          * 4.  Therefore, current and best both have partner replies or
1385          *     both do not, so perform selection policy:
1386          *
1387          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1388          *     select by bandwidth.
1389          *
1390          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1391          */
1392         if (!best)
1393                 return curr;
1394
1395         if (!curr->is_individual && best->is_individual)
1396                 return curr;
1397
1398         if (curr->is_individual && !best->is_individual)
1399                 return best;
1400
1401         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1402                 return curr;
1403
1404         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1405                 return best;
1406
1407         switch (__get_agg_selection_mode(curr->lag_ports)) {
1408         case BOND_AD_COUNT:
1409                 if (curr->num_of_ports > best->num_of_ports)
1410                         return curr;
1411
1412                 if (curr->num_of_ports < best->num_of_ports)
1413                         return best;
1414
1415                 /*FALLTHROUGH*/
1416         case BOND_AD_STABLE:
1417         case BOND_AD_BANDWIDTH:
1418                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1419                         return curr;
1420
1421                 break;
1422
1423         default:
1424                 pr_warning("%s: Impossible agg select mode %d\n",
1425                            curr->slave->bond->dev->name,
1426                            __get_agg_selection_mode(curr->lag_ports));
1427                 break;
1428         }
1429
1430         return best;
1431 }
1432
1433 static int agg_device_up(const struct aggregator *agg)
1434 {
1435         struct port *port = agg->lag_ports;
1436         if (!port)
1437                 return 0;
1438         return (netif_running(port->slave->dev) &&
1439                 netif_carrier_ok(port->slave->dev));
1440 }
1441
1442 /**
1443  * ad_agg_selection_logic - select an aggregation group for a team
1444  * @aggregator: the aggregator we're looking at
1445  *
1446  * It is assumed that only one aggregator may be selected for a team.
1447  *
1448  * The logic of this function is to select the aggregator according to
1449  * the ad_select policy:
1450  *
1451  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1452  * it, and to reselect the active aggregator only if the previous
1453  * aggregator has no more ports related to it.
1454  *
1455  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1456  * bandwidth, and reselect whenever a link state change takes place or the
1457  * set of slaves in the bond changes.
1458  *
1459  * BOND_AD_COUNT: select the aggregator with largest number of ports
1460  * (slaves), and reselect whenever a link state change takes place or the
1461  * set of slaves in the bond changes.
1462  *
1463  * FIXME: this function MUST be called with the first agg in the bond, or
1464  * __get_active_agg() won't work correctly. This function should be better
1465  * called with the bond itself, and retrieve the first agg from it.
1466  */
1467 static void ad_agg_selection_logic(struct aggregator *agg)
1468 {
1469         struct aggregator *best, *active, *origin;
1470         struct bonding *bond = agg->slave->bond;
1471         struct list_head *iter;
1472         struct slave *slave;
1473         struct port *port;
1474
1475         origin = agg;
1476         active = __get_active_agg(agg);
1477         best = (active && agg_device_up(active)) ? active : NULL;
1478
1479         rcu_read_lock();
1480         bond_for_each_slave_rcu(bond, slave, iter) {
1481                 agg = &(SLAVE_AD_INFO(slave).aggregator);
1482
1483                 agg->is_active = 0;
1484
1485                 if (agg->num_of_ports && agg_device_up(agg))
1486                         best = ad_agg_selection_test(best, agg);
1487         }
1488
1489         if (best &&
1490             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1491                 /*
1492                  * For the STABLE policy, don't replace the old active
1493                  * aggregator if it's still active (it has an answering
1494                  * partner) or if both the best and active don't have an
1495                  * answering partner.
1496                  */
1497                 if (active && active->lag_ports &&
1498                     active->lag_ports->is_enabled &&
1499                     (__agg_has_partner(active) ||
1500                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1501                         if (!(!active->actor_oper_aggregator_key &&
1502                               best->actor_oper_aggregator_key)) {
1503                                 best = NULL;
1504                                 active->is_active = 1;
1505                         }
1506                 }
1507         }
1508
1509         if (best && (best == active)) {
1510                 best = NULL;
1511                 active->is_active = 1;
1512         }
1513
1514         /* if there is new best aggregator, activate it */
1515         if (best) {
1516                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1517                          best->aggregator_identifier, best->num_of_ports,
1518                          best->actor_oper_aggregator_key,
1519                          best->partner_oper_aggregator_key,
1520                          best->is_individual, best->is_active);
1521                 pr_debug("best ports %p slave %p %s\n",
1522                          best->lag_ports, best->slave,
1523                          best->slave ? best->slave->dev->name : "NULL");
1524
1525                 bond_for_each_slave_rcu(bond, slave, iter) {
1526                         agg = &(SLAVE_AD_INFO(slave).aggregator);
1527
1528                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1529                                  agg->aggregator_identifier, agg->num_of_ports,
1530                                  agg->actor_oper_aggregator_key,
1531                                  agg->partner_oper_aggregator_key,
1532                                  agg->is_individual, agg->is_active);
1533                 }
1534
1535                 /* check if any partner replys */
1536                 if (best->is_individual) {
1537                         pr_warning("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1538                                 best->slave ?
1539                                 best->slave->bond->dev->name : "NULL");
1540                 }
1541
1542                 best->is_active = 1;
1543                 pr_debug("LAG %d chosen as the active LAG\n",
1544                          best->aggregator_identifier);
1545                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1546                          best->aggregator_identifier, best->num_of_ports,
1547                          best->actor_oper_aggregator_key,
1548                          best->partner_oper_aggregator_key,
1549                          best->is_individual, best->is_active);
1550
1551                 /* disable the ports that were related to the former active_aggregator */
1552                 if (active) {
1553                         for (port = active->lag_ports; port;
1554                              port = port->next_port_in_aggregator) {
1555                                 __disable_port(port);
1556                         }
1557                 }
1558         }
1559
1560         /*
1561          * if the selected aggregator is of join individuals
1562          * (partner_system is NULL), enable their ports
1563          */
1564         active = __get_active_agg(origin);
1565
1566         if (active) {
1567                 if (!__agg_has_partner(active)) {
1568                         for (port = active->lag_ports; port;
1569                              port = port->next_port_in_aggregator) {
1570                                 __enable_port(port);
1571                         }
1572                 }
1573         }
1574
1575         rcu_read_unlock();
1576
1577         bond_3ad_set_carrier(bond);
1578 }
1579
1580 /**
1581  * ad_clear_agg - clear a given aggregator's parameters
1582  * @aggregator: the aggregator we're looking at
1583  *
1584  */
1585 static void ad_clear_agg(struct aggregator *aggregator)
1586 {
1587         if (aggregator) {
1588                 aggregator->is_individual = false;
1589                 aggregator->actor_admin_aggregator_key = 0;
1590                 aggregator->actor_oper_aggregator_key = 0;
1591                 aggregator->partner_system = null_mac_addr;
1592                 aggregator->partner_system_priority = 0;
1593                 aggregator->partner_oper_aggregator_key = 0;
1594                 aggregator->receive_state = 0;
1595                 aggregator->transmit_state = 0;
1596                 aggregator->lag_ports = NULL;
1597                 aggregator->is_active = 0;
1598                 aggregator->num_of_ports = 0;
1599                 pr_debug("LAG %d was cleared\n",
1600                          aggregator->aggregator_identifier);
1601         }
1602 }
1603
1604 /**
1605  * ad_initialize_agg - initialize a given aggregator's parameters
1606  * @aggregator: the aggregator we're looking at
1607  *
1608  */
1609 static void ad_initialize_agg(struct aggregator *aggregator)
1610 {
1611         if (aggregator) {
1612                 ad_clear_agg(aggregator);
1613
1614                 aggregator->aggregator_mac_address = null_mac_addr;
1615                 aggregator->aggregator_identifier = 0;
1616                 aggregator->slave = NULL;
1617         }
1618 }
1619
1620 /**
1621  * ad_initialize_port - initialize a given port's parameters
1622  * @aggregator: the aggregator we're looking at
1623  * @lacp_fast: boolean. whether fast periodic should be used
1624  *
1625  */
1626 static void ad_initialize_port(struct port *port, int lacp_fast)
1627 {
1628         static const struct port_params tmpl = {
1629                 .system_priority = 0xffff,
1630                 .key             = 1,
1631                 .port_number     = 1,
1632                 .port_priority   = 0xff,
1633                 .port_state      = 1,
1634         };
1635         static const struct lacpdu lacpdu = {
1636                 .subtype                = 0x01,
1637                 .version_number = 0x01,
1638                 .tlv_type_actor_info = 0x01,
1639                 .actor_information_length = 0x14,
1640                 .tlv_type_partner_info = 0x02,
1641                 .partner_information_length = 0x14,
1642                 .tlv_type_collector_info = 0x03,
1643                 .collector_information_length = 0x10,
1644                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1645         };
1646
1647         if (port) {
1648                 port->actor_port_number = 1;
1649                 port->actor_port_priority = 0xff;
1650                 port->actor_system = null_mac_addr;
1651                 port->actor_system_priority = 0xffff;
1652                 port->actor_port_aggregator_identifier = 0;
1653                 port->ntt = false;
1654                 port->actor_admin_port_key = 1;
1655                 port->actor_oper_port_key  = 1;
1656                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1657                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1658
1659                 if (lacp_fast)
1660                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1661
1662                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1663                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1664
1665                 port->is_enabled = true;
1666                 // ****** private parameters ******
1667                 port->sm_vars = 0x3;
1668                 port->sm_rx_state = 0;
1669                 port->sm_rx_timer_counter = 0;
1670                 port->sm_periodic_state = 0;
1671                 port->sm_periodic_timer_counter = 0;
1672                 port->sm_mux_state = 0;
1673                 port->sm_mux_timer_counter = 0;
1674                 port->sm_tx_state = 0;
1675                 port->sm_tx_timer_counter = 0;
1676                 port->slave = NULL;
1677                 port->aggregator = NULL;
1678                 port->next_port_in_aggregator = NULL;
1679                 port->transaction_id = 0;
1680
1681                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1682         }
1683 }
1684
1685 /**
1686  * ad_enable_collecting_distributing - enable a port's transmit/receive
1687  * @port: the port we're looking at
1688  *
1689  * Enable @port if it's in an active aggregator
1690  */
1691 static void ad_enable_collecting_distributing(struct port *port)
1692 {
1693         if (port->aggregator->is_active) {
1694                 pr_debug("Enabling port %d(LAG %d)\n",
1695                          port->actor_port_number,
1696                          port->aggregator->aggregator_identifier);
1697                 __enable_port(port);
1698         }
1699 }
1700
1701 /**
1702  * ad_disable_collecting_distributing - disable a port's transmit/receive
1703  * @port: the port we're looking at
1704  *
1705  */
1706 static void ad_disable_collecting_distributing(struct port *port)
1707 {
1708         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1709                 pr_debug("Disabling port %d(LAG %d)\n",
1710                          port->actor_port_number,
1711                          port->aggregator->aggregator_identifier);
1712                 __disable_port(port);
1713         }
1714 }
1715
1716 #if 0
1717 /**
1718  * ad_marker_info_send - send a marker information frame
1719  * @port: the port we're looking at
1720  *
1721  * This function does nothing since we decided not to implement send and handle
1722  * response for marker PDU's, in this stage, but only to respond to marker
1723  * information.
1724  */
1725 static void ad_marker_info_send(struct port *port)
1726 {
1727         struct bond_marker marker;
1728         u16 index;
1729
1730         // fill the marker PDU with the appropriate values
1731         marker.subtype = 0x02;
1732         marker.version_number = 0x01;
1733         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1734         marker.marker_length = 0x16;
1735         // convert requester_port to Big Endian
1736         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1737         marker.requester_system = port->actor_system;
1738         // convert requester_port(u32) to Big Endian
1739         marker.requester_transaction_id =
1740                 (((++port->transaction_id & 0xFF) << 24)
1741                  | ((port->transaction_id & 0xFF00) << 8)
1742                  | ((port->transaction_id & 0xFF0000) >> 8)
1743                  | ((port->transaction_id & 0xFF000000) >> 24));
1744         marker.pad = 0;
1745         marker.tlv_type_terminator = 0x00;
1746         marker.terminator_length = 0x00;
1747         for (index = 0; index < 90; index++)
1748                 marker.reserved_90[index] = 0;
1749
1750         // send the marker information
1751         if (ad_marker_send(port, &marker) >= 0) {
1752                 pr_debug("Sent Marker Information on port %d\n",
1753                          port->actor_port_number);
1754         }
1755 }
1756 #endif
1757
1758 /**
1759  * ad_marker_info_received - handle receive of a Marker information frame
1760  * @marker_info: Marker info received
1761  * @port: the port we're looking at
1762  *
1763  */
1764 static void ad_marker_info_received(struct bond_marker *marker_info,
1765         struct port *port)
1766 {
1767         struct bond_marker marker;
1768
1769         // copy the received marker data to the response marker
1770         //marker = *marker_info;
1771         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1772         // change the marker subtype to marker response
1773         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1774         // send the marker response
1775
1776         if (ad_marker_send(port, &marker) >= 0) {
1777                 pr_debug("Sent Marker Response on port %d\n",
1778                          port->actor_port_number);
1779         }
1780 }
1781
1782 /**
1783  * ad_marker_response_received - handle receive of a marker response frame
1784  * @marker: marker PDU received
1785  * @port: the port we're looking at
1786  *
1787  * This function does nothing since we decided not to implement send and handle
1788  * response for marker PDU's, in this stage, but only to respond to marker
1789  * information.
1790  */
1791 static void ad_marker_response_received(struct bond_marker *marker,
1792         struct port *port)
1793 {
1794         marker = NULL; /* just to satisfy the compiler */
1795         port = NULL;  /* just to satisfy the compiler */
1796         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1797 }
1798
1799 //////////////////////////////////////////////////////////////////////////////////////
1800 // ================= AD exported functions to the main bonding code ==================
1801 //////////////////////////////////////////////////////////////////////////////////////
1802
1803 // Check aggregators status in team every T seconds
1804 #define AD_AGGREGATOR_SELECTION_TIMER  8
1805
1806 /*
1807  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1808  *
1809  * Set the aggregation selection timer, to initiate an agg selection in
1810  * the very near future.  Called during first initialization, and during
1811  * any down to up transitions of the bond.
1812  */
1813 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1814 {
1815         BOND_AD_INFO(bond).agg_select_timer = timeout;
1816 }
1817
1818 static u16 aggregator_identifier;
1819
1820 /**
1821  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1822  * @bond: bonding struct to work on
1823  * @tick_resolution: tick duration (millisecond resolution)
1824  *
1825  * Can be called only after the mac address of the bond is set.
1826  */
1827 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1828 {
1829         // check that the bond is not initialized yet
1830         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1831                                 bond->dev->dev_addr)) {
1832
1833                 aggregator_identifier = 0;
1834
1835                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1836                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1837
1838                 // initialize how many times this module is called in one second(should be about every 100ms)
1839                 ad_ticks_per_sec = tick_resolution;
1840
1841                 bond_3ad_initiate_agg_selection(bond,
1842                                                 AD_AGGREGATOR_SELECTION_TIMER *
1843                                                 ad_ticks_per_sec);
1844         }
1845 }
1846
1847 /**
1848  * bond_3ad_bind_slave - initialize a slave's port
1849  * @slave: slave struct to work on
1850  *
1851  * Returns:   0 on success
1852  *          < 0 on error
1853  */
1854 int bond_3ad_bind_slave(struct slave *slave)
1855 {
1856         struct bonding *bond = bond_get_bond_by_slave(slave);
1857         struct port *port;
1858         struct aggregator *aggregator;
1859
1860         if (bond == NULL) {
1861                 pr_err("%s: The slave %s is not attached to its bond\n",
1862                        slave->bond->dev->name, slave->dev->name);
1863                 return -1;
1864         }
1865
1866         //check that the slave has not been initialized yet.
1867         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1868
1869                 // port initialization
1870                 port = &(SLAVE_AD_INFO(slave).port);
1871
1872                 ad_initialize_port(port, bond->params.lacp_fast);
1873
1874                 __initialize_port_locks(slave);
1875                 port->slave = slave;
1876                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1877                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1878                 //              ------------------------------------------------------------
1879                 // Port key :   | User key                       |      Speed       |Duplex|
1880                 //              ------------------------------------------------------------
1881                 //              16                               6               1 0
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         return 0;
1911 }
1912
1913 /**
1914  * bond_3ad_unbind_slave - deinitialize a slave's port
1915  * @slave: slave struct to work on
1916  *
1917  * Search for the aggregator that is related to this port, remove the
1918  * aggregator and assign another aggregator for other port related to it
1919  * (if any), and remove the port.
1920  */
1921 void bond_3ad_unbind_slave(struct slave *slave)
1922 {
1923         struct port *port, *prev_port, *temp_port;
1924         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1925         int select_new_active_agg = 0;
1926         struct bonding *bond = slave->bond;
1927         struct slave *slave_iter;
1928         struct list_head *iter;
1929
1930         // find the aggregator related to this slave
1931         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1932
1933         // find the port related to this slave
1934         port = &(SLAVE_AD_INFO(slave).port);
1935
1936         // if slave is null, the whole port is not initialized
1937         if (!port->slave) {
1938                 pr_warning("Warning: %s: Trying to unbind an uninitialized port on %s\n",
1939                            slave->bond->dev->name, slave->dev->name);
1940                 return;
1941         }
1942
1943         pr_debug("Unbinding Link Aggregation Group %d\n",
1944                  aggregator->aggregator_identifier);
1945
1946         /* Tell the partner that this port is not suitable for aggregation */
1947         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1948         __update_lacpdu_from_port(port);
1949         ad_lacpdu_send(port);
1950
1951         // check if this aggregator is occupied
1952         if (aggregator->lag_ports) {
1953                 // check if there are other ports related to this aggregator except
1954                 // the port related to this slave(thats ensure us that there is a
1955                 // reason to search for new aggregator, and that we will find one
1956                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1957                         // find new aggregator for the related port(s)
1958                         bond_for_each_slave(bond, slave_iter, iter) {
1959                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
1960                                 // if the new aggregator is empty, or it is connected to our port only
1961                                 if (!new_aggregator->lag_ports
1962                                     || ((new_aggregator->lag_ports == port)
1963                                         && !new_aggregator->lag_ports->next_port_in_aggregator))
1964                                         break;
1965                         }
1966                         if (!slave_iter)
1967                                 new_aggregator = NULL;
1968                         // if new aggregator found, copy the aggregator's parameters
1969                         // and connect the related lag_ports to the new aggregator
1970                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1971                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n",
1972                                          aggregator->aggregator_identifier,
1973                                          new_aggregator->aggregator_identifier);
1974
1975                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1976                                         pr_info("%s: Removing an active aggregator\n",
1977                                                 aggregator->slave->bond->dev->name);
1978                                         // select new active aggregator
1979                                          select_new_active_agg = 1;
1980                                 }
1981
1982                                 new_aggregator->is_individual = aggregator->is_individual;
1983                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1984                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1985                                 new_aggregator->partner_system = aggregator->partner_system;
1986                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1987                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1988                                 new_aggregator->receive_state = aggregator->receive_state;
1989                                 new_aggregator->transmit_state = aggregator->transmit_state;
1990                                 new_aggregator->lag_ports = aggregator->lag_ports;
1991                                 new_aggregator->is_active = aggregator->is_active;
1992                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
1993
1994                                 // update the information that is written on the ports about the aggregator
1995                                 for (temp_port = aggregator->lag_ports; temp_port;
1996                                      temp_port = temp_port->next_port_in_aggregator) {
1997                                         temp_port->aggregator = new_aggregator;
1998                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
1999                                 }
2000
2001                                 // clear the aggregator
2002                                 ad_clear_agg(aggregator);
2003
2004                                 if (select_new_active_agg)
2005                                         ad_agg_selection_logic(__get_first_agg(port));
2006                         } else {
2007                                 pr_warning("%s: Warning: unbinding aggregator, and could not find a new aggregator for its ports\n",
2008                                            slave->bond->dev->name);
2009                         }
2010                 } else { // in case that the only port related to this aggregator is the one we want to remove
2011                         select_new_active_agg = aggregator->is_active;
2012                         // clear the aggregator
2013                         ad_clear_agg(aggregator);
2014                         if (select_new_active_agg) {
2015                                 pr_info("%s: Removing an active aggregator\n",
2016                                         slave->bond->dev->name);
2017                                 // select new active aggregator
2018                                 temp_aggregator = __get_first_agg(port);
2019                                 if (temp_aggregator)
2020                                         ad_agg_selection_logic(temp_aggregator);
2021                         }
2022                 }
2023         }
2024
2025         pr_debug("Unbinding port %d\n", port->actor_port_number);
2026         // find the aggregator that this port is connected to
2027         bond_for_each_slave(bond, slave_iter, iter) {
2028                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter).aggregator);
2029                 prev_port = NULL;
2030                 // search the port in the aggregator's related ports
2031                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2032                      prev_port = temp_port,
2033                              temp_port = temp_port->next_port_in_aggregator) {
2034                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2035                                 if (prev_port)
2036                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2037                                 else
2038                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2039                                 temp_aggregator->num_of_ports--;
2040                                 if (temp_aggregator->num_of_ports == 0) {
2041                                         select_new_active_agg = temp_aggregator->is_active;
2042                                         // clear the aggregator
2043                                         ad_clear_agg(temp_aggregator);
2044                                         if (select_new_active_agg) {
2045                                                 pr_info("%s: Removing an active aggregator\n",
2046                                                         slave->bond->dev->name);
2047                                                 // select new active aggregator
2048                                                 ad_agg_selection_logic(__get_first_agg(port));
2049                                         }
2050                                 }
2051                                 break;
2052                         }
2053                 }
2054         }
2055         port->slave = NULL;
2056 }
2057
2058 /**
2059  * bond_3ad_state_machine_handler - handle state machines timeout
2060  * @bond: bonding struct to work on
2061  *
2062  * The state machine handling concept in this module is to check every tick
2063  * which state machine should operate any function. The execution order is
2064  * round robin, so when we have an interaction between state machines, the
2065  * reply of one to each other might be delayed until next tick.
2066  *
2067  * This function also complete the initialization when the agg_select_timer
2068  * times out, and it selects an aggregator for the ports that are yet not
2069  * related to any aggregator, and selects the active aggregator for a bond.
2070  */
2071 void bond_3ad_state_machine_handler(struct work_struct *work)
2072 {
2073         struct bonding *bond = container_of(work, struct bonding,
2074                                             ad_work.work);
2075         struct aggregator *aggregator;
2076         struct list_head *iter;
2077         struct slave *slave;
2078         struct port *port;
2079
2080         read_lock(&bond->lock);
2081         rcu_read_lock();
2082
2083         /* check if there are any slaves */
2084         if (!bond_has_slaves(bond))
2085                 goto re_arm;
2086
2087         /* check if agg_select_timer timer after initialize is timed out */
2088         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2089                 slave = bond_first_slave_rcu(bond);
2090                 port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
2091
2092                 /* select the active aggregator for the bond */
2093                 if (port) {
2094                         if (!port->slave) {
2095                                 pr_warning("%s: Warning: bond's first port is uninitialized\n",
2096                                            bond->dev->name);
2097                                 goto re_arm;
2098                         }
2099
2100                         aggregator = __get_first_agg(port);
2101                         ad_agg_selection_logic(aggregator);
2102                 }
2103                 bond_3ad_set_carrier(bond);
2104         }
2105
2106         /* for each port run the state machines */
2107         bond_for_each_slave_rcu(bond, slave, iter) {
2108                 port = &(SLAVE_AD_INFO(slave).port);
2109                 if (!port->slave) {
2110                         pr_warning("%s: Warning: Found an uninitialized port\n",
2111                                    bond->dev->name);
2112                         goto re_arm;
2113                 }
2114
2115                 /* Lock around state machines to protect data accessed
2116                  * by all (e.g., port->sm_vars).  ad_rx_machine may run
2117                  * concurrently due to incoming LACPDU.
2118                  */
2119                 __get_state_machine_lock(port);
2120
2121                 ad_rx_machine(NULL, port);
2122                 ad_periodic_machine(port);
2123                 ad_port_selection_logic(port);
2124                 ad_mux_machine(port);
2125                 ad_tx_machine(port);
2126
2127                 /* turn off the BEGIN bit, since we already handled it */
2128                 if (port->sm_vars & AD_PORT_BEGIN)
2129                         port->sm_vars &= ~AD_PORT_BEGIN;
2130
2131                 __release_state_machine_lock(port);
2132         }
2133
2134 re_arm:
2135         rcu_read_unlock();
2136         read_unlock(&bond->lock);
2137         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2138 }
2139
2140 /**
2141  * bond_3ad_rx_indication - handle a received frame
2142  * @lacpdu: received lacpdu
2143  * @slave: slave struct to work on
2144  * @length: length of the data received
2145  *
2146  * It is assumed that frames that were sent on this NIC don't returned as new
2147  * received frames (loopback). Since only the payload is given to this
2148  * function, it check for loopback.
2149  */
2150 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2151 {
2152         struct port *port;
2153         int ret = RX_HANDLER_ANOTHER;
2154
2155         if (length >= sizeof(struct lacpdu)) {
2156
2157                 port = &(SLAVE_AD_INFO(slave).port);
2158
2159                 if (!port->slave) {
2160                         pr_warning("%s: Warning: port of slave %s is uninitialized\n",
2161                                    slave->dev->name, slave->bond->dev->name);
2162                         return ret;
2163                 }
2164
2165                 switch (lacpdu->subtype) {
2166                 case AD_TYPE_LACPDU:
2167                         ret = RX_HANDLER_CONSUMED;
2168                         pr_debug("Received LACPDU on port %d\n",
2169                                  port->actor_port_number);
2170                         /* Protect against concurrent state machines */
2171                         __get_state_machine_lock(port);
2172                         ad_rx_machine(lacpdu, port);
2173                         __release_state_machine_lock(port);
2174                         break;
2175
2176                 case AD_TYPE_MARKER:
2177                         ret = RX_HANDLER_CONSUMED;
2178                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2179
2180                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2181                         case AD_MARKER_INFORMATION_SUBTYPE:
2182                                 pr_debug("Received Marker Information on port %d\n",
2183                                          port->actor_port_number);
2184                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2185                                 break;
2186
2187                         case AD_MARKER_RESPONSE_SUBTYPE:
2188                                 pr_debug("Received Marker Response on port %d\n",
2189                                          port->actor_port_number);
2190                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2191                                 break;
2192
2193                         default:
2194                                 pr_debug("Received an unknown Marker subtype on slot %d\n",
2195                                          port->actor_port_number);
2196                         }
2197                 }
2198         }
2199         return ret;
2200 }
2201
2202 /**
2203  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2204  * @slave: slave struct to work on
2205  *
2206  * Handle reselection of aggregator (if needed) for this port.
2207  */
2208 void bond_3ad_adapter_speed_changed(struct slave *slave)
2209 {
2210         struct port *port;
2211
2212         port = &(SLAVE_AD_INFO(slave).port);
2213
2214         // if slave is null, the whole port is not initialized
2215         if (!port->slave) {
2216                 pr_warning("Warning: %s: speed changed for uninitialized port on %s\n",
2217                            slave->bond->dev->name, slave->dev->name);
2218                 return;
2219         }
2220
2221         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2222         port->actor_oper_port_key = port->actor_admin_port_key |=
2223                 (__get_link_speed(port) << 1);
2224         pr_debug("Port %d changed speed\n", port->actor_port_number);
2225         // there is no need to reselect a new aggregator, just signal the
2226         // state machines to reinitialize
2227         port->sm_vars |= AD_PORT_BEGIN;
2228 }
2229
2230 /**
2231  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2232  * @slave: slave struct to work on
2233  *
2234  * Handle reselection of aggregator (if needed) for this port.
2235  */
2236 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2237 {
2238         struct port *port;
2239
2240         port = &(SLAVE_AD_INFO(slave).port);
2241
2242         // if slave is null, the whole port is not initialized
2243         if (!port->slave) {
2244                 pr_warning("%s: Warning: duplex changed for uninitialized port on %s\n",
2245                            slave->bond->dev->name, slave->dev->name);
2246                 return;
2247         }
2248
2249         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2250         port->actor_oper_port_key = port->actor_admin_port_key |=
2251                 __get_duplex(port);
2252         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2253         // there is no need to reselect a new aggregator, just signal the
2254         // state machines to reinitialize
2255         port->sm_vars |= AD_PORT_BEGIN;
2256 }
2257
2258 /**
2259  * bond_3ad_handle_link_change - handle a slave's link status change indication
2260  * @slave: slave struct to work on
2261  * @status: whether the link is now up or down
2262  *
2263  * Handle reselection of aggregator (if needed) for this port.
2264  */
2265 void bond_3ad_handle_link_change(struct slave *slave, char link)
2266 {
2267         struct port *port;
2268
2269         port = &(SLAVE_AD_INFO(slave).port);
2270
2271         // if slave is null, the whole port is not initialized
2272         if (!port->slave) {
2273                 pr_warning("Warning: %s: link status changed for uninitialized port on %s\n",
2274                            slave->bond->dev->name, slave->dev->name);
2275                 return;
2276         }
2277
2278         // 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)
2279         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2280         if (link == BOND_LINK_UP) {
2281                 port->is_enabled = true;
2282                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2283                 port->actor_oper_port_key = port->actor_admin_port_key |=
2284                         __get_duplex(port);
2285                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2286                 port->actor_oper_port_key = port->actor_admin_port_key |=
2287                         (__get_link_speed(port) << 1);
2288         } else {
2289                 /* link has failed */
2290                 port->is_enabled = false;
2291                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2292                 port->actor_oper_port_key = (port->actor_admin_port_key &=
2293                                              ~AD_SPEED_KEY_BITS);
2294         }
2295         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2296         // there is no need to reselect a new aggregator, just signal the
2297         // state machines to reinitialize
2298         port->sm_vars |= AD_PORT_BEGIN;
2299 }
2300
2301 /*
2302  * set link state for bonding master: if we have an active
2303  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2304  * have an active aggregator if there are no slaves with link up.
2305  *
2306  * This behavior complies with IEEE 802.3 section 43.3.9.
2307  *
2308  * Called by bond_set_carrier(). Return zero if carrier state does not
2309  * change, nonzero if it does.
2310  */
2311 int bond_3ad_set_carrier(struct bonding *bond)
2312 {
2313         struct aggregator *active;
2314         struct slave *first_slave;
2315
2316         rcu_read_lock();
2317         first_slave = bond_first_slave_rcu(bond);
2318         rcu_read_unlock();
2319         if (!first_slave)
2320                 return 0;
2321         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
2322         if (active) {
2323                 /* are enough slaves available to consider link up? */
2324                 if (active->num_of_ports < bond->params.min_links) {
2325                         if (netif_carrier_ok(bond->dev)) {
2326                                 netif_carrier_off(bond->dev);
2327                                 return 1;
2328                         }
2329                 } else if (!netif_carrier_ok(bond->dev)) {
2330                         netif_carrier_on(bond->dev);
2331                         return 1;
2332                 }
2333                 return 0;
2334         }
2335
2336         if (netif_carrier_ok(bond->dev)) {
2337                 netif_carrier_off(bond->dev);
2338                 return 1;
2339         }
2340         return 0;
2341 }
2342
2343 /**
2344  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2345  * @bond: bonding struct to work on
2346  * @ad_info: ad_info struct to fill with the bond's info
2347  *
2348  * Returns:   0 on success
2349  *          < 0 on error
2350  */
2351 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2352                                    struct ad_info *ad_info)
2353 {
2354         struct aggregator *aggregator = NULL;
2355         struct list_head *iter;
2356         struct slave *slave;
2357         struct port *port;
2358
2359         bond_for_each_slave_rcu(bond, slave, iter) {
2360                 port = &(SLAVE_AD_INFO(slave).port);
2361                 if (port->aggregator && port->aggregator->is_active) {
2362                         aggregator = port->aggregator;
2363                         break;
2364                 }
2365         }
2366
2367         if (aggregator) {
2368                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2369                 ad_info->ports = aggregator->num_of_ports;
2370                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2371                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2372                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2373                 return 0;
2374         }
2375
2376         return -1;
2377 }
2378
2379 /* Wrapper used to hold bond->lock so no slave manipulation can occur */
2380 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2381 {
2382         int ret;
2383
2384         rcu_read_lock();
2385         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2386         rcu_read_unlock();
2387
2388         return ret;
2389 }
2390
2391 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2392 {
2393         struct bonding *bond = netdev_priv(dev);
2394         struct slave *slave, *first_ok_slave;
2395         struct aggregator *agg;
2396         struct ad_info ad_info;
2397         struct list_head *iter;
2398         int slaves_in_agg;
2399         int slave_agg_no;
2400         int res = 1;
2401         int agg_id;
2402
2403         if (__bond_3ad_get_active_agg_info(bond, &ad_info)) {
2404                 pr_debug("%s: Error: __bond_3ad_get_active_agg_info failed\n",
2405                          dev->name);
2406                 goto out;
2407         }
2408
2409         slaves_in_agg = ad_info.ports;
2410         agg_id = ad_info.aggregator_id;
2411
2412         if (slaves_in_agg == 0) {
2413                 pr_debug("%s: Error: active aggregator is empty\n", dev->name);
2414                 goto out;
2415         }
2416
2417         slave_agg_no = bond_xmit_hash(bond, skb, slaves_in_agg);
2418         first_ok_slave = NULL;
2419
2420         bond_for_each_slave_rcu(bond, slave, iter) {
2421                 agg = SLAVE_AD_INFO(slave).port.aggregator;
2422                 if (!agg || agg->aggregator_identifier != agg_id)
2423                         continue;
2424
2425                 if (slave_agg_no >= 0) {
2426                         if (!first_ok_slave && SLAVE_IS_OK(slave))
2427                                 first_ok_slave = slave;
2428                         slave_agg_no--;
2429                         continue;
2430                 }
2431
2432                 if (SLAVE_IS_OK(slave)) {
2433                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2434                         goto out;
2435                 }
2436         }
2437
2438         if (slave_agg_no >= 0) {
2439                 pr_err("%s: Error: Couldn't find a slave to tx on for aggregator ID %d\n",
2440                        dev->name, agg_id);
2441                 goto out;
2442         }
2443
2444         /* we couldn't find any suitable slave after the agg_no, so use the
2445          * first suitable found, if found. */
2446         if (first_ok_slave)
2447                 res = bond_dev_queue_xmit(bond, skb, first_ok_slave->dev);
2448
2449 out:
2450         if (res) {
2451                 /* no suitable interface, frame not sent */
2452                 kfree_skb(skb);
2453         }
2454
2455         return NETDEV_TX_OK;
2456 }
2457
2458 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2459                          struct slave *slave)
2460 {
2461         int ret = RX_HANDLER_ANOTHER;
2462         struct lacpdu *lacpdu, _lacpdu;
2463
2464         if (skb->protocol != PKT_TYPE_LACPDU)
2465                 return ret;
2466
2467         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2468         if (!lacpdu)
2469                 return ret;
2470
2471         read_lock(&bond->lock);
2472         ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
2473         read_unlock(&bond->lock);
2474         return ret;
2475 }
2476
2477 /*
2478  * When modify lacp_rate parameter via sysfs,
2479  * update actor_oper_port_state of each port.
2480  *
2481  * Hold slave->state_machine_lock,
2482  * so we can modify port->actor_oper_port_state,
2483  * no matter bond is up or down.
2484  */
2485 void bond_3ad_update_lacp_rate(struct bonding *bond)
2486 {
2487         struct port *port = NULL;
2488         struct list_head *iter;
2489         struct slave *slave;
2490         int lacp_fast;
2491
2492         lacp_fast = bond->params.lacp_fast;
2493         bond_for_each_slave(bond, slave, iter) {
2494                 port = &(SLAVE_AD_INFO(slave).port);
2495                 __get_state_machine_lock(port);
2496                 if (lacp_fast)
2497                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2498                 else
2499                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2500                 __release_state_machine_lock(port);
2501         }
2502 }