root/drivers/net/bonding/bond_3ad.c

DEFINITIONS

1. __get_bond_by_port
2. __get_first_agg
3. __agg_has_partner
4. __disable_port
5. __enable_port
6. __port_is_enabled
7. __get_agg_selection_mode
8. __check_agg_selection_timer
9. __get_link_speed
10. __get_duplex
11. __ad_actor_update_port
12. __ad_timer_to_ticks
13. __choose_matched
14. __record_pdu
15. __record_default
16. __update_selected
17. __update_default_selected
18. __update_ntt
19. __agg_ports_are_ready
20. __set_agg_ports_ready
21. __agg_active_ports
22. __get_agg_bandwidth
23. __get_active_agg
24. __update_lacpdu_from_port
25. ad_lacpdu_send
26. ad_marker_send
27. ad_mux_machine
28. ad_rx_machine
29. ad_churn_machine
30. ad_tx_machine
31. ad_periodic_machine
32. ad_port_selection_logic
33. ad_agg_selection_test
34. agg_device_up
35. ad_agg_selection_logic
36. ad_clear_agg
37. ad_initialize_agg
38. ad_initialize_port
39. ad_enable_collecting_distributing
40. ad_disable_collecting_distributing
41. ad_marker_info_received
42. ad_marker_response_received
43. bond_3ad_initiate_agg_selection
44. bond_3ad_initialize
45. bond_3ad_bind_slave
46. bond_3ad_unbind_slave
47. bond_3ad_update_ad_actor_settings
48. bond_3ad_state_machine_handler
49. bond_3ad_rx_indication
50. ad_update_actor_keys
51. bond_3ad_adapter_speed_duplex_changed
52. bond_3ad_handle_link_change
53. bond_3ad_set_carrier
54. __bond_3ad_get_active_agg_info
55. bond_3ad_get_active_agg_info
56. bond_3ad_lacpdu_recv
57. bond_3ad_update_lacp_rate
58. bond_3ad_stats_size
59. bond_3ad_stats_fill

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
   4  */
   5 
   6 #include <linux/skbuff.h>
   7 #include <linux/if_ether.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/spinlock.h>
  10 #include <linux/ethtool.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/if_bonding.h>
  13 #include <linux/pkt_sched.h>
  14 #include <net/net_namespace.h>
  15 #include <net/bonding.h>
  16 #include <net/bond_3ad.h>
  17 #include <net/netlink.h>
  18 
  19 /* General definitions */
  20 #define AD_SHORT_TIMEOUT           1
  21 #define AD_LONG_TIMEOUT            0
  22 #define AD_STANDBY                 0x2
  23 #define AD_MAX_TX_IN_SECOND        3
  24 #define AD_COLLECTOR_MAX_DELAY     0
  25 
  26 /* Timer definitions (43.4.4 in the 802.3ad standard) */
  27 #define AD_FAST_PERIODIC_TIME      1
  28 #define AD_SLOW_PERIODIC_TIME      30
  29 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
  30 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
  31 #define AD_CHURN_DETECTION_TIME    60
  32 #define AD_AGGREGATE_WAIT_TIME     2
  33 
  34 /* Port state definitions (43.4.2.2 in the 802.3ad standard) */
  35 #define AD_STATE_LACP_ACTIVITY   0x1
  36 #define AD_STATE_LACP_TIMEOUT    0x2
  37 #define AD_STATE_AGGREGATION     0x4
  38 #define AD_STATE_SYNCHRONIZATION 0x8
  39 #define AD_STATE_COLLECTING      0x10
  40 #define AD_STATE_DISTRIBUTING    0x20
  41 #define AD_STATE_DEFAULTED       0x40
  42 #define AD_STATE_EXPIRED         0x80
  43 
  44 /* Port Variables definitions used by the State Machines (43.4.7 in the
  45  * 802.3ad standard)
  46  */
  47 #define AD_PORT_BEGIN           0x1
  48 #define AD_PORT_LACP_ENABLED    0x2
  49 #define AD_PORT_ACTOR_CHURN     0x4
  50 #define AD_PORT_PARTNER_CHURN   0x8
  51 #define AD_PORT_READY           0x10
  52 #define AD_PORT_READY_N         0x20
  53 #define AD_PORT_MATCHED         0x40
  54 #define AD_PORT_STANDBY         0x80
  55 #define AD_PORT_SELECTED        0x100
  56 #define AD_PORT_MOVED           0x200
  57 #define AD_PORT_CHURNED         (AD_PORT_ACTOR_CHURN | AD_PORT_PARTNER_CHURN)
  58 
  59 /* Port Key definitions
  60  * key is determined according to the link speed, duplex and
  61  * user key (which is yet not supported)
  62  *           --------------------------------------------------------------
  63  * Port key  | User key (10 bits)           | Speed (5 bits)      | Duplex|
  64  *           --------------------------------------------------------------
  65  *           |15                           6|5                   1|0
  66  */
  67 #define  AD_DUPLEX_KEY_MASKS    0x1
  68 #define  AD_SPEED_KEY_MASKS     0x3E
  69 #define  AD_USER_KEY_MASKS      0xFFC0
  70 
  71 enum ad_link_speed_type {
  72         AD_LINK_SPEED_1MBPS = 1,
  73         AD_LINK_SPEED_10MBPS,
  74         AD_LINK_SPEED_100MBPS,
  75         AD_LINK_SPEED_1000MBPS,
  76         AD_LINK_SPEED_2500MBPS,
  77         AD_LINK_SPEED_5000MBPS,
  78         AD_LINK_SPEED_10000MBPS,
  79         AD_LINK_SPEED_14000MBPS,
  80         AD_LINK_SPEED_20000MBPS,
  81         AD_LINK_SPEED_25000MBPS,
  82         AD_LINK_SPEED_40000MBPS,
  83         AD_LINK_SPEED_50000MBPS,
  84         AD_LINK_SPEED_56000MBPS,
  85         AD_LINK_SPEED_100000MBPS,
  86 };
  87 
  88 /* compare MAC addresses */
  89 #define MAC_ADDRESS_EQUAL(A, B) \
  90         ether_addr_equal_64bits((const u8 *)A, (const u8 *)B)
  91 
  92 static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = {
  93         0, 0, 0, 0, 0, 0
  94 };
  95 static u16 ad_ticks_per_sec;
  96 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
  97 
  98 static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned =
  99         MULTICAST_LACPDU_ADDR;
 100 
 101 /* ================= main 802.3ad protocol functions ================== */
 102 static int ad_lacpdu_send(struct port *port);
 103 static int ad_marker_send(struct port *port, struct bond_marker *marker);
 104 static void ad_mux_machine(struct port *port, bool *update_slave_arr);
 105 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
 106 static void ad_tx_machine(struct port *port);
 107 static void ad_periodic_machine(struct port *port);
 108 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr);
 109 static void ad_agg_selection_logic(struct aggregator *aggregator,
 110                                    bool *update_slave_arr);
 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                                               bool *update_slave_arr);
 116 static void ad_disable_collecting_distributing(struct port *port,
 117                                                bool *update_slave_arr);
 118 static void ad_marker_info_received(struct bond_marker *marker_info,
 119                                     struct port *port);
 120 static void ad_marker_response_received(struct bond_marker *marker,
 121                                         struct port *port);
 122 static void ad_update_actor_keys(struct port *port, bool reset);
 123 
 124 
 125 /* ================= api to bonding and kernel code ================== */
 126 
 127 /**
 128  * __get_bond_by_port - get the port's bonding struct
 129  * @port: the port we're looking at
 130  *
 131  * Return @port's bonding struct, or %NULL if it can't be found.
 132  */
 133 static inline struct bonding *__get_bond_by_port(struct port *port)
 134 {
 135         if (port->slave == NULL)
 136                 return NULL;
 137 
 138         return bond_get_bond_by_slave(port->slave);
 139 }
 140 
 141 /**
 142  * __get_first_agg - get the first aggregator in the bond
 143  * @bond: the bond we're looking at
 144  *
 145  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
 146  * found.
 147  * The caller must hold RCU or RTNL lock.
 148  */
 149 static inline struct aggregator *__get_first_agg(struct port *port)
 150 {
 151         struct bonding *bond = __get_bond_by_port(port);
 152         struct slave *first_slave;
 153         struct aggregator *agg;
 154 
 155         /* If there's no bond for this port, or bond has no slaves */
 156         if (bond == NULL)
 157                 return NULL;
 158 
 159         rcu_read_lock();
 160         first_slave = bond_first_slave_rcu(bond);
 161         agg = first_slave ? &(SLAVE_AD_INFO(first_slave)->aggregator) : NULL;
 162         rcu_read_unlock();
 163 
 164         return agg;
 165 }
 166 
 167 /**
 168  * __agg_has_partner - see if we have a partner
 169  * @agg: the agregator we're looking at
 170  *
 171  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
 172  * address for the partner). Return 0 if not.
 173  */
 174 static inline int __agg_has_partner(struct aggregator *agg)
 175 {
 176         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
 177 }
 178 
 179 /**
 180  * __disable_port - disable the port's slave
 181  * @port: the port we're looking at
 182  */
 183 static inline void __disable_port(struct port *port)
 184 {
 185         bond_set_slave_inactive_flags(port->slave, BOND_SLAVE_NOTIFY_LATER);
 186 }
 187 
 188 /**
 189  * __enable_port - enable the port's slave, if it's up
 190  * @port: the port we're looking at
 191  */
 192 static inline void __enable_port(struct port *port)
 193 {
 194         struct slave *slave = port->slave;
 195 
 196         if ((slave->link == BOND_LINK_UP) && bond_slave_is_up(slave))
 197                 bond_set_slave_active_flags(slave, BOND_SLAVE_NOTIFY_LATER);
 198 }
 199 
 200 /**
 201  * __port_is_enabled - check if the port's slave is in active state
 202  * @port: the port we're looking at
 203  */
 204 static inline int __port_is_enabled(struct port *port)
 205 {
 206         return bond_is_active_slave(port->slave);
 207 }
 208 
 209 /**
 210  * __get_agg_selection_mode - get the aggregator selection mode
 211  * @port: the port we're looking at
 212  *
 213  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
 214  */
 215 static inline u32 __get_agg_selection_mode(struct port *port)
 216 {
 217         struct bonding *bond = __get_bond_by_port(port);
 218 
 219         if (bond == NULL)
 220                 return BOND_AD_STABLE;
 221 
 222         return bond->params.ad_select;
 223 }
 224 
 225 /**
 226  * __check_agg_selection_timer - check if the selection timer has expired
 227  * @port: the port we're looking at
 228  */
 229 static inline int __check_agg_selection_timer(struct port *port)
 230 {
 231         struct bonding *bond = __get_bond_by_port(port);
 232 
 233         if (bond == NULL)
 234                 return 0;
 235 
 236         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
 237 }
 238 
 239 /**
 240  * __get_link_speed - get a port's speed
 241  * @port: the port we're looking at
 242  *
 243  * Return @port's speed in 802.3ad enum format. i.e. one of:
 244  *     0,
 245  *     %AD_LINK_SPEED_10MBPS,
 246  *     %AD_LINK_SPEED_100MBPS,
 247  *     %AD_LINK_SPEED_1000MBPS,
 248  *     %AD_LINK_SPEED_2500MBPS,
 249  *     %AD_LINK_SPEED_5000MBPS,
 250  *     %AD_LINK_SPEED_10000MBPS
 251  *     %AD_LINK_SPEED_14000MBPS,
 252  *     %AD_LINK_SPEED_20000MBPS
 253  *     %AD_LINK_SPEED_25000MBPS
 254  *     %AD_LINK_SPEED_40000MBPS
 255  *     %AD_LINK_SPEED_50000MBPS
 256  *     %AD_LINK_SPEED_56000MBPS
 257  *     %AD_LINK_SPEED_100000MBPS
 258  */
 259 static u16 __get_link_speed(struct port *port)
 260 {
 261         struct slave *slave = port->slave;
 262         u16 speed;
 263 
 264         /* this if covers only a special case: when the configuration starts
 265          * with link down, it sets the speed to 0.
 266          * This is done in spite of the fact that the e100 driver reports 0
 267          * to be compatible with MVT in the future.
 268          */
 269         if (slave->link != BOND_LINK_UP)
 270                 speed = 0;
 271         else {
 272                 switch (slave->speed) {
 273                 case SPEED_10:
 274                         speed = AD_LINK_SPEED_10MBPS;
 275                         break;
 276 
 277                 case SPEED_100:
 278                         speed = AD_LINK_SPEED_100MBPS;
 279                         break;
 280 
 281                 case SPEED_1000:
 282                         speed = AD_LINK_SPEED_1000MBPS;
 283                         break;
 284 
 285                 case SPEED_2500:
 286                         speed = AD_LINK_SPEED_2500MBPS;
 287                         break;
 288 
 289                 case SPEED_5000:
 290                         speed = AD_LINK_SPEED_5000MBPS;
 291                         break;
 292 
 293                 case SPEED_10000:
 294                         speed = AD_LINK_SPEED_10000MBPS;
 295                         break;
 296 
 297                 case SPEED_14000:
 298                         speed = AD_LINK_SPEED_14000MBPS;
 299                         break;
 300 
 301                 case SPEED_20000:
 302                         speed = AD_LINK_SPEED_20000MBPS;
 303                         break;
 304 
 305                 case SPEED_25000:
 306                         speed = AD_LINK_SPEED_25000MBPS;
 307                         break;
 308 
 309                 case SPEED_40000:
 310                         speed = AD_LINK_SPEED_40000MBPS;
 311                         break;
 312 
 313                 case SPEED_50000:
 314                         speed = AD_LINK_SPEED_50000MBPS;
 315                         break;
 316 
 317                 case SPEED_56000:
 318                         speed = AD_LINK_SPEED_56000MBPS;
 319                         break;
 320 
 321                 case SPEED_100000:
 322                         speed = AD_LINK_SPEED_100000MBPS;
 323                         break;
 324 
 325                 default:
 326                         /* unknown speed value from ethtool. shouldn't happen */
 327                         if (slave->speed != SPEED_UNKNOWN)
 328                                 pr_warn_once("%s: (slave %s): unknown ethtool speed (%d) for port %d (set it to 0)\n",
 329                                              slave->bond->dev->name,
 330                                              slave->dev->name, slave->speed,
 331                                              port->actor_port_number);
 332                         speed = 0;
 333                         break;
 334                 }
 335         }
 336 
 337         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received link speed %d update from adapter\n",
 338                   port->actor_port_number, speed);
 339         return speed;
 340 }
 341 
 342 /**
 343  * __get_duplex - get a port's duplex
 344  * @port: the port we're looking at
 345  *
 346  * Return @port's duplex in 802.3ad bitmask format. i.e.:
 347  *     0x01 if in full duplex
 348  *     0x00 otherwise
 349  */
 350 static u8 __get_duplex(struct port *port)
 351 {
 352         struct slave *slave = port->slave;
 353         u8 retval = 0x0;
 354 
 355         /* handling a special case: when the configuration starts with
 356          * link down, it sets the duplex to 0.
 357          */
 358         if (slave->link == BOND_LINK_UP) {
 359                 switch (slave->duplex) {
 360                 case DUPLEX_FULL:
 361                         retval = 0x1;
 362                         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status full duplex update from adapter\n",
 363                                   port->actor_port_number);
 364                         break;
 365                 case DUPLEX_HALF:
 366                 default:
 367                         retval = 0x0;
 368                         slave_dbg(slave->bond->dev, slave->dev, "Port %d Received status NOT full duplex update from adapter\n",
 369                                   port->actor_port_number);
 370                         break;
 371                 }
 372         }
 373         return retval;
 374 }
 375 
 376 static void __ad_actor_update_port(struct port *port)
 377 {
 378         const struct bonding *bond = bond_get_bond_by_slave(port->slave);
 379 
 380         port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
 381         port->actor_system_priority = BOND_AD_INFO(bond).system.sys_priority;
 382 }
 383 
 384 /* Conversions */
 385 
 386 /**
 387  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
 388  * @timer_type: which timer to operate
 389  * @par: timer parameter. see below
 390  *
 391  * If @timer_type is %current_while_timer, @par indicates long/short timer.
 392  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
 393  *                                                   %SLOW_PERIODIC_TIME.
 394  */
 395 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
 396 {
 397         u16 retval = 0; /* to silence the compiler */
 398 
 399         switch (timer_type) {
 400         case AD_CURRENT_WHILE_TIMER:    /* for rx machine usage */
 401                 if (par)
 402                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec);
 403                 else
 404                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec);
 405                 break;
 406         case AD_ACTOR_CHURN_TIMER:      /* for local churn machine */
 407                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 408                 break;
 409         case AD_PERIODIC_TIMER:         /* for periodic machine */
 410                 retval = (par*ad_ticks_per_sec); /* long timeout */
 411                 break;
 412         case AD_PARTNER_CHURN_TIMER:    /* for remote churn machine */
 413                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
 414                 break;
 415         case AD_WAIT_WHILE_TIMER:       /* for selection machine */
 416                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
 417                 break;
 418         }
 419 
 420         return retval;
 421 }
 422 
 423 
 424 /* ================= ad_rx_machine helper functions ================== */
 425 
 426 /**
 427  * __choose_matched - update a port's matched variable from a received lacpdu
 428  * @lacpdu: the lacpdu we've received
 429  * @port: the port we're looking at
 430  *
 431  * Update the value of the matched variable, using parameter values from a
 432  * newly received lacpdu. Parameter values for the partner carried in the
 433  * received PDU are compared with the corresponding operational parameter
 434  * values for the actor. Matched is set to TRUE if all of these parameters
 435  * match and the PDU parameter partner_state.aggregation has the same value as
 436  * actor_oper_port_state.aggregation and lacp will actively maintain the link
 437  * in the aggregation. Matched is also set to TRUE if the value of
 438  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
 439  * an individual link and lacp will actively maintain the link. Otherwise,
 440  * matched is set to FALSE. LACP is considered to be actively maintaining the
 441  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
 442  * the actor's actor_oper_port_state.lacp_activity and the PDU's
 443  * partner_state.lacp_activity variables are TRUE.
 444  *
 445  * Note: the AD_PORT_MATCHED "variable" is not specified by 802.3ad; it is
 446  * used here to implement the language from 802.3ad 43.4.9 that requires
 447  * recordPDU to "match" the LACPDU parameters to the stored values.
 448  */
 449 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
 450 {
 451         /* check if all parameters are alike
 452          * or this is individual link(aggregation == FALSE)
 453          * then update the state machine Matched variable.
 454          */
 455         if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
 456              (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
 457              MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) &&
 458              (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
 459              (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
 460              ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
 461             ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
 462                 ) {
 463                 port->sm_vars |= AD_PORT_MATCHED;
 464         } else {
 465                 port->sm_vars &= ~AD_PORT_MATCHED;
 466         }
 467 }
 468 
 469 /**
 470  * __record_pdu - record parameters from a received lacpdu
 471  * @lacpdu: the lacpdu we've received
 472  * @port: the port we're looking at
 473  *
 474  * Record the parameter values for the Actor carried in a received lacpdu as
 475  * the current partner operational parameter values and sets
 476  * actor_oper_port_state.defaulted to FALSE.
 477  */
 478 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
 479 {
 480         if (lacpdu && port) {
 481                 struct port_params *partner = &port->partner_oper;
 482 
 483                 __choose_matched(lacpdu, port);
 484                 /* record the new parameter values for the partner
 485                  * operational
 486                  */
 487                 partner->port_number = ntohs(lacpdu->actor_port);
 488                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
 489                 partner->system = lacpdu->actor_system;
 490                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
 491                 partner->key = ntohs(lacpdu->actor_key);
 492                 partner->port_state = lacpdu->actor_state;
 493 
 494                 /* set actor_oper_port_state.defaulted to FALSE */
 495                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
 496 
 497                 /* set the partner sync. to on if the partner is sync,
 498                  * and the port is matched
 499                  */
 500                 if ((port->sm_vars & AD_PORT_MATCHED) &&
 501                     (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
 502                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
 503                         slave_dbg(port->slave->bond->dev, port->slave->dev,
 504                                   "partner sync=1\n");
 505                 } else {
 506                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
 507                         slave_dbg(port->slave->bond->dev, port->slave->dev,
 508                                   "partner sync=0\n");
 509                 }
 510         }
 511 }
 512 
 513 /**
 514  * __record_default - record default parameters
 515  * @port: the port we're looking at
 516  *
 517  * This function records the default parameter values for the partner carried
 518  * in the Partner Admin parameters as the current partner operational parameter
 519  * values and sets actor_oper_port_state.defaulted to TRUE.
 520  */
 521 static void __record_default(struct port *port)
 522 {
 523         if (port) {
 524                 /* record the partner admin parameters */
 525                 memcpy(&port->partner_oper, &port->partner_admin,
 526                        sizeof(struct port_params));
 527 
 528                 /* set actor_oper_port_state.defaulted to true */
 529                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
 530         }
 531 }
 532 
 533 /**
 534  * __update_selected - update a port's Selected variable from a received lacpdu
 535  * @lacpdu: the lacpdu we've received
 536  * @port: the port we're looking at
 537  *
 538  * Update the value of the selected variable, using parameter values from a
 539  * newly received lacpdu. The parameter values for the Actor carried in the
 540  * received PDU are compared with the corresponding operational parameter
 541  * values for the ports partner. If one or more of the comparisons shows that
 542  * the value(s) received in the PDU differ from the current operational values,
 543  * then selected is set to FALSE and actor_oper_port_state.synchronization is
 544  * set to out_of_sync. Otherwise, selected remains unchanged.
 545  */
 546 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
 547 {
 548         if (lacpdu && port) {
 549                 const struct port_params *partner = &port->partner_oper;
 550 
 551                 /* check if any parameter is different then
 552                  * update the state machine selected variable.
 553                  */
 554                 if (ntohs(lacpdu->actor_port) != partner->port_number ||
 555                     ntohs(lacpdu->actor_port_priority) != partner->port_priority ||
 556                     !MAC_ADDRESS_EQUAL(&lacpdu->actor_system, &partner->system) ||
 557                     ntohs(lacpdu->actor_system_priority) != partner->system_priority ||
 558                     ntohs(lacpdu->actor_key) != partner->key ||
 559                     (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
 560                         port->sm_vars &= ~AD_PORT_SELECTED;
 561                 }
 562         }
 563 }
 564 
 565 /**
 566  * __update_default_selected - update a port's Selected variable from Partner
 567  * @port: the port we're looking at
 568  *
 569  * This function updates the value of the selected variable, using the partner
 570  * administrative parameter values. The administrative values are compared with
 571  * the corresponding operational parameter values for the partner. If one or
 572  * more of the comparisons shows that the administrative value(s) differ from
 573  * the current operational values, then Selected is set to FALSE and
 574  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
 575  * Selected remains unchanged.
 576  */
 577 static void __update_default_selected(struct port *port)
 578 {
 579         if (port) {
 580                 const struct port_params *admin = &port->partner_admin;
 581                 const struct port_params *oper = &port->partner_oper;
 582 
 583                 /* check if any parameter is different then
 584                  * update the state machine selected variable.
 585                  */
 586                 if (admin->port_number != oper->port_number ||
 587                     admin->port_priority != oper->port_priority ||
 588                     !MAC_ADDRESS_EQUAL(&admin->system, &oper->system) ||
 589                     admin->system_priority != oper->system_priority ||
 590                     admin->key != oper->key ||
 591                     (admin->port_state & AD_STATE_AGGREGATION)
 592                         != (oper->port_state & AD_STATE_AGGREGATION)) {
 593                         port->sm_vars &= ~AD_PORT_SELECTED;
 594                 }
 595         }
 596 }
 597 
 598 /**
 599  * __update_ntt - update a port's ntt variable from a received lacpdu
 600  * @lacpdu: the lacpdu we've received
 601  * @port: the port we're looking at
 602  *
 603  * Updates the value of the ntt variable, using parameter values from a newly
 604  * received lacpdu. The parameter values for the partner carried in the
 605  * received PDU are compared with the corresponding operational parameter
 606  * values for the Actor. If one or more of the comparisons shows that the
 607  * value(s) received in the PDU differ from the current operational values,
 608  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
 609  */
 610 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
 611 {
 612         /* validate lacpdu and port */
 613         if (lacpdu && port) {
 614                 /* check if any parameter is different then
 615                  * update the port->ntt.
 616                  */
 617                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
 618                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
 619                     !MAC_ADDRESS_EQUAL(&(lacpdu->partner_system), &(port->actor_system)) ||
 620                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
 621                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
 622                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
 623                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
 624                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
 625                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
 626                    ) {
 627                         port->ntt = true;
 628                 }
 629         }
 630 }
 631 
 632 /**
 633  * __agg_ports_are_ready - check if all ports in an aggregator are ready
 634  * @aggregator: the aggregator we're looking at
 635  *
 636  */
 637 static int __agg_ports_are_ready(struct aggregator *aggregator)
 638 {
 639         struct port *port;
 640         int retval = 1;
 641 
 642         if (aggregator) {
 643                 /* scan all ports in this aggregator to verfy if they are
 644                  * all ready.
 645                  */
 646                 for (port = aggregator->lag_ports;
 647                      port;
 648                      port = port->next_port_in_aggregator) {
 649                         if (!(port->sm_vars & AD_PORT_READY_N)) {
 650                                 retval = 0;
 651                                 break;
 652                         }
 653                 }
 654         }
 655 
 656         return retval;
 657 }
 658 
 659 /**
 660  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
 661  * @aggregator: the aggregator we're looking at
 662  * @val: Should the ports' ready bit be set on or off
 663  *
 664  */
 665 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
 666 {
 667         struct port *port;
 668 
 669         for (port = aggregator->lag_ports; port;
 670              port = port->next_port_in_aggregator) {
 671                 if (val)
 672                         port->sm_vars |= AD_PORT_READY;
 673                 else
 674                         port->sm_vars &= ~AD_PORT_READY;
 675         }
 676 }
 677 
 678 static int __agg_active_ports(struct aggregator *agg)
 679 {
 680         struct port *port;
 681         int active = 0;
 682 
 683         for (port = agg->lag_ports; port;
 684              port = port->next_port_in_aggregator) {
 685                 if (port->is_enabled)
 686                         active++;
 687         }
 688 
 689         return active;
 690 }
 691 
 692 /**
 693  * __get_agg_bandwidth - get the total bandwidth of an aggregator
 694  * @aggregator: the aggregator we're looking at
 695  *
 696  */
 697 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
 698 {
 699         int nports = __agg_active_ports(aggregator);
 700         u32 bandwidth = 0;
 701 
 702         if (nports) {
 703                 switch (__get_link_speed(aggregator->lag_ports)) {
 704                 case AD_LINK_SPEED_1MBPS:
 705                         bandwidth = nports;
 706                         break;
 707                 case AD_LINK_SPEED_10MBPS:
 708                         bandwidth = nports * 10;
 709                         break;
 710                 case AD_LINK_SPEED_100MBPS:
 711                         bandwidth = nports * 100;
 712                         break;
 713                 case AD_LINK_SPEED_1000MBPS:
 714                         bandwidth = nports * 1000;
 715                         break;
 716                 case AD_LINK_SPEED_2500MBPS:
 717                         bandwidth = nports * 2500;
 718                         break;
 719                 case AD_LINK_SPEED_5000MBPS:
 720                         bandwidth = nports * 5000;
 721                         break;
 722                 case AD_LINK_SPEED_10000MBPS:
 723                         bandwidth = nports * 10000;
 724                         break;
 725                 case AD_LINK_SPEED_14000MBPS:
 726                         bandwidth = nports * 14000;
 727                         break;
 728                 case AD_LINK_SPEED_20000MBPS:
 729                         bandwidth = nports * 20000;
 730                         break;
 731                 case AD_LINK_SPEED_25000MBPS:
 732                         bandwidth = nports * 25000;
 733                         break;
 734                 case AD_LINK_SPEED_40000MBPS:
 735                         bandwidth = nports * 40000;
 736                         break;
 737                 case AD_LINK_SPEED_50000MBPS:
 738                         bandwidth = nports * 50000;
 739                         break;
 740                 case AD_LINK_SPEED_56000MBPS:
 741                         bandwidth = nports * 56000;
 742                         break;
 743                 case AD_LINK_SPEED_100000MBPS:
 744                         bandwidth = nports * 100000;
 745                         break;
 746                 default:
 747                         bandwidth = 0; /* to silence the compiler */
 748                 }
 749         }
 750         return bandwidth;
 751 }
 752 
 753 /**
 754  * __get_active_agg - get the current active aggregator
 755  * @aggregator: the aggregator we're looking at
 756  *
 757  * Caller must hold RCU lock.
 758  */
 759 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
 760 {
 761         struct bonding *bond = aggregator->slave->bond;
 762         struct list_head *iter;
 763         struct slave *slave;
 764 
 765         bond_for_each_slave_rcu(bond, slave, iter)
 766                 if (SLAVE_AD_INFO(slave)->aggregator.is_active)
 767                         return &(SLAVE_AD_INFO(slave)->aggregator);
 768 
 769         return NULL;
 770 }
 771 
 772 /**
 773  * __update_lacpdu_from_port - update a port's lacpdu fields
 774  * @port: the port we're looking at
 775  */
 776 static inline void __update_lacpdu_from_port(struct port *port)
 777 {
 778         struct lacpdu *lacpdu = &port->lacpdu;
 779         const struct port_params *partner = &port->partner_oper;
 780 
 781         /* update current actual Actor parameters
 782          * lacpdu->subtype                   initialized
 783          * lacpdu->version_number            initialized
 784          * lacpdu->tlv_type_actor_info       initialized
 785          * lacpdu->actor_information_length  initialized
 786          */
 787 
 788         lacpdu->actor_system_priority = htons(port->actor_system_priority);
 789         lacpdu->actor_system = port->actor_system;
 790         lacpdu->actor_key = htons(port->actor_oper_port_key);
 791         lacpdu->actor_port_priority = htons(port->actor_port_priority);
 792         lacpdu->actor_port = htons(port->actor_port_number);
 793         lacpdu->actor_state = port->actor_oper_port_state;
 794         slave_dbg(port->slave->bond->dev, port->slave->dev,
 795                   "update lacpdu: actor port state %x\n",
 796                   port->actor_oper_port_state);
 797 
 798         /* lacpdu->reserved_3_1              initialized
 799          * lacpdu->tlv_type_partner_info     initialized
 800          * lacpdu->partner_information_length initialized
 801          */
 802 
 803         lacpdu->partner_system_priority = htons(partner->system_priority);
 804         lacpdu->partner_system = partner->system;
 805         lacpdu->partner_key = htons(partner->key);
 806         lacpdu->partner_port_priority = htons(partner->port_priority);
 807         lacpdu->partner_port = htons(partner->port_number);
 808         lacpdu->partner_state = partner->port_state;
 809 
 810         /* lacpdu->reserved_3_2              initialized
 811          * lacpdu->tlv_type_collector_info   initialized
 812          * lacpdu->collector_information_length initialized
 813          * collector_max_delay                initialized
 814          * reserved_12[12]                   initialized
 815          * tlv_type_terminator               initialized
 816          * terminator_length                 initialized
 817          * reserved_50[50]                   initialized
 818          */
 819 }
 820 
 821 /* ================= main 802.3ad protocol code ========================= */
 822 
 823 /**
 824  * ad_lacpdu_send - send out a lacpdu packet on a given port
 825  * @port: the port we're looking at
 826  *
 827  * Returns:   0 on success
 828  *          < 0 on error
 829  */
 830 static int ad_lacpdu_send(struct port *port)
 831 {
 832         struct slave *slave = port->slave;
 833         struct sk_buff *skb;
 834         struct lacpdu_header *lacpdu_header;
 835         int length = sizeof(struct lacpdu_header);
 836 
 837         skb = dev_alloc_skb(length);
 838         if (!skb)
 839                 return -ENOMEM;
 840 
 841         atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_tx);
 842         atomic64_inc(&BOND_AD_INFO(slave->bond).stats.lacpdu_tx);
 843 
 844         skb->dev = slave->dev;
 845         skb_reset_mac_header(skb);
 846         skb->network_header = skb->mac_header + ETH_HLEN;
 847         skb->protocol = PKT_TYPE_LACPDU;
 848         skb->priority = TC_PRIO_CONTROL;
 849 
 850         lacpdu_header = skb_put(skb, length);
 851 
 852         ether_addr_copy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr);
 853         /* Note: source address is set to be the member's PERMANENT address,
 854          * because we use it to identify loopback lacpdus in receive.
 855          */
 856         ether_addr_copy(lacpdu_header->hdr.h_source, slave->perm_hwaddr);
 857         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
 858 
 859         lacpdu_header->lacpdu = port->lacpdu;
 860 
 861         dev_queue_xmit(skb);
 862 
 863         return 0;
 864 }
 865 
 866 /**
 867  * ad_marker_send - send marker information/response on a given port
 868  * @port: the port we're looking at
 869  * @marker: marker data to send
 870  *
 871  * Returns:   0 on success
 872  *          < 0 on error
 873  */
 874 static int ad_marker_send(struct port *port, struct bond_marker *marker)
 875 {
 876         struct slave *slave = port->slave;
 877         struct sk_buff *skb;
 878         struct bond_marker_header *marker_header;
 879         int length = sizeof(struct bond_marker_header);
 880 
 881         skb = dev_alloc_skb(length + 16);
 882         if (!skb)
 883                 return -ENOMEM;
 884 
 885         switch (marker->tlv_type) {
 886         case AD_MARKER_INFORMATION_SUBTYPE:
 887                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_tx);
 888                 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_tx);
 889                 break;
 890         case AD_MARKER_RESPONSE_SUBTYPE:
 891                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.marker_resp_tx);
 892                 atomic64_inc(&BOND_AD_INFO(slave->bond).stats.marker_resp_tx);
 893                 break;
 894         }
 895 
 896         skb_reserve(skb, 16);
 897 
 898         skb->dev = slave->dev;
 899         skb_reset_mac_header(skb);
 900         skb->network_header = skb->mac_header + ETH_HLEN;
 901         skb->protocol = PKT_TYPE_LACPDU;
 902 
 903         marker_header = skb_put(skb, length);
 904 
 905         ether_addr_copy(marker_header->hdr.h_dest, lacpdu_mcast_addr);
 906         /* Note: source address is set to be the member's PERMANENT address,
 907          * because we use it to identify loopback MARKERs in receive.
 908          */
 909         ether_addr_copy(marker_header->hdr.h_source, slave->perm_hwaddr);
 910         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
 911 
 912         marker_header->marker = *marker;
 913 
 914         dev_queue_xmit(skb);
 915 
 916         return 0;
 917 }
 918 
 919 /**
 920  * ad_mux_machine - handle a port's mux state machine
 921  * @port: the port we're looking at
 922  * @update_slave_arr: Does slave array need update?
 923  */
 924 static void ad_mux_machine(struct port *port, bool *update_slave_arr)
 925 {
 926         mux_states_t last_state;
 927 
 928         /* keep current State Machine state to compare later if it was
 929          * changed
 930          */
 931         last_state = port->sm_mux_state;
 932 
 933         if (port->sm_vars & AD_PORT_BEGIN) {
 934                 port->sm_mux_state = AD_MUX_DETACHED;
 935         } else {
 936                 switch (port->sm_mux_state) {
 937                 case AD_MUX_DETACHED:
 938                         if ((port->sm_vars & AD_PORT_SELECTED)
 939                             || (port->sm_vars & AD_PORT_STANDBY))
 940                                 /* if SELECTED or STANDBY */
 941                                 port->sm_mux_state = AD_MUX_WAITING;
 942                         break;
 943                 case AD_MUX_WAITING:
 944                         /* if SELECTED == FALSE return to DETACH state */
 945                         if (!(port->sm_vars & AD_PORT_SELECTED)) {
 946                                 port->sm_vars &= ~AD_PORT_READY_N;
 947                                 /* in order to withhold the Selection Logic to
 948                                  * check all ports READY_N value every callback
 949                                  * cycle to update ready variable, we check
 950                                  * READY_N and update READY here
 951                                  */
 952                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 953                                 port->sm_mux_state = AD_MUX_DETACHED;
 954                                 break;
 955                         }
 956 
 957                         /* check if the wait_while_timer expired */
 958                         if (port->sm_mux_timer_counter
 959                             && !(--port->sm_mux_timer_counter))
 960                                 port->sm_vars |= AD_PORT_READY_N;
 961 
 962                         /* in order to withhold the selection logic to check
 963                          * all ports READY_N value every callback cycle to
 964                          * update ready variable, we check READY_N and update
 965                          * READY here
 966                          */
 967                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 968 
 969                         /* if the wait_while_timer expired, and the port is
 970                          * in READY state, move to ATTACHED state
 971                          */
 972                         if ((port->sm_vars & AD_PORT_READY)
 973                             && !port->sm_mux_timer_counter)
 974                                 port->sm_mux_state = AD_MUX_ATTACHED;
 975                         break;
 976                 case AD_MUX_ATTACHED:
 977                         /* check also if agg_select_timer expired (so the
 978                          * edable port will take place only after this timer)
 979                          */
 980                         if ((port->sm_vars & AD_PORT_SELECTED) &&
 981                             (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) &&
 982                             !__check_agg_selection_timer(port)) {
 983                                 if (port->aggregator->is_active)
 984                                         port->sm_mux_state =
 985                                             AD_MUX_COLLECTING_DISTRIBUTING;
 986                         } else if (!(port->sm_vars & AD_PORT_SELECTED) ||
 987                                    (port->sm_vars & AD_PORT_STANDBY)) {
 988                                 /* if UNSELECTED or STANDBY */
 989                                 port->sm_vars &= ~AD_PORT_READY_N;
 990                                 /* in order to withhold the selection logic to
 991                                  * check all ports READY_N value every callback
 992                                  * cycle to update ready variable, we check
 993                                  * READY_N and update READY here
 994                                  */
 995                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
 996                                 port->sm_mux_state = AD_MUX_DETACHED;
 997                         } else if (port->aggregator->is_active) {
 998                                 port->actor_oper_port_state |=
 999                                     AD_STATE_SYNCHRONIZATION;
1000                         }
1001                         break;
1002                 case AD_MUX_COLLECTING_DISTRIBUTING:
1003                         if (!(port->sm_vars & AD_PORT_SELECTED) ||
1004                             (port->sm_vars & AD_PORT_STANDBY) ||
1005                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) ||
1006                             !(port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) {
1007                                 port->sm_mux_state = AD_MUX_ATTACHED;
1008                         } else {
1009                                 /* if port state hasn't changed make
1010                                  * sure that a collecting distributing
1011                                  * port in an active aggregator is enabled
1012                                  */
1013                                 if (port->aggregator &&
1014                                     port->aggregator->is_active &&
1015                                     !__port_is_enabled(port)) {
1016 
1017                                         __enable_port(port);
1018                                 }
1019                         }
1020                         break;
1021                 default:
1022                         break;
1023                 }
1024         }
1025 
1026         /* check if the state machine was changed */
1027         if (port->sm_mux_state != last_state) {
1028                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1029                           "Mux Machine: Port=%d, Last State=%d, Curr State=%d\n",
1030                           port->actor_port_number,
1031                           last_state,
1032                           port->sm_mux_state);
1033                 switch (port->sm_mux_state) {
1034                 case AD_MUX_DETACHED:
1035                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1036                         ad_disable_collecting_distributing(port,
1037                                                            update_slave_arr);
1038                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1039                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1040                         port->ntt = true;
1041                         break;
1042                 case AD_MUX_WAITING:
1043                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1044                         break;
1045                 case AD_MUX_ATTACHED:
1046                         if (port->aggregator->is_active)
1047                                 port->actor_oper_port_state |=
1048                                     AD_STATE_SYNCHRONIZATION;
1049                         else
1050                                 port->actor_oper_port_state &=
1051                                     ~AD_STATE_SYNCHRONIZATION;
1052                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1053                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1054                         ad_disable_collecting_distributing(port,
1055                                                            update_slave_arr);
1056                         port->ntt = true;
1057                         break;
1058                 case AD_MUX_COLLECTING_DISTRIBUTING:
1059                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1060                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1061                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1062                         ad_enable_collecting_distributing(port,
1063                                                           update_slave_arr);
1064                         port->ntt = true;
1065                         break;
1066                 default:
1067                         break;
1068                 }
1069         }
1070 }
1071 
1072 /**
1073  * ad_rx_machine - handle a port's rx State Machine
1074  * @lacpdu: the lacpdu we've received
1075  * @port: the port we're looking at
1076  *
1077  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1078  * CURRENT. If timer expired set the state machine in the proper state.
1079  * In other cases, this function checks if we need to switch to other state.
1080  */
1081 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1082 {
1083         rx_states_t last_state;
1084 
1085         /* keep current State Machine state to compare later if it was
1086          * changed
1087          */
1088         last_state = port->sm_rx_state;
1089 
1090         if (lacpdu) {
1091                 atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.lacpdu_rx);
1092                 atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.lacpdu_rx);
1093         }
1094         /* check if state machine should change state */
1095 
1096         /* first, check if port was reinitialized */
1097         if (port->sm_vars & AD_PORT_BEGIN) {
1098                 port->sm_rx_state = AD_RX_INITIALIZE;
1099                 port->sm_vars |= AD_PORT_CHURNED;
1100         /* check if port is not enabled */
1101         } else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled)
1102                 port->sm_rx_state = AD_RX_PORT_DISABLED;
1103         /* check if new lacpdu arrived */
1104         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) ||
1105                  (port->sm_rx_state == AD_RX_DEFAULTED) ||
1106                  (port->sm_rx_state == AD_RX_CURRENT))) {
1107                 if (port->sm_rx_state != AD_RX_CURRENT)
1108                         port->sm_vars |= AD_PORT_CHURNED;
1109                 port->sm_rx_timer_counter = 0;
1110                 port->sm_rx_state = AD_RX_CURRENT;
1111         } else {
1112                 /* if timer is on, and if it is expired */
1113                 if (port->sm_rx_timer_counter &&
1114                     !(--port->sm_rx_timer_counter)) {
1115                         switch (port->sm_rx_state) {
1116                         case AD_RX_EXPIRED:
1117                                 port->sm_rx_state = AD_RX_DEFAULTED;
1118                                 break;
1119                         case AD_RX_CURRENT:
1120                                 port->sm_rx_state = AD_RX_EXPIRED;
1121                                 break;
1122                         default:
1123                                 break;
1124                         }
1125                 } else {
1126                         /* if no lacpdu arrived and no timer is on */
1127                         switch (port->sm_rx_state) {
1128                         case AD_RX_PORT_DISABLED:
1129                                 if (port->is_enabled &&
1130                                     (port->sm_vars & AD_PORT_LACP_ENABLED))
1131                                         port->sm_rx_state = AD_RX_EXPIRED;
1132                                 else if (port->is_enabled
1133                                          && ((port->sm_vars
1134                                               & AD_PORT_LACP_ENABLED) == 0))
1135                                         port->sm_rx_state = AD_RX_LACP_DISABLED;
1136                                 break;
1137                         default:
1138                                 break;
1139 
1140                         }
1141                 }
1142         }
1143 
1144         /* check if the State machine was changed or new lacpdu arrived */
1145         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1146                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1147                           "Rx Machine: Port=%d, Last State=%d, Curr State=%d\n",
1148                           port->actor_port_number,
1149                           last_state,
1150                           port->sm_rx_state);
1151                 switch (port->sm_rx_state) {
1152                 case AD_RX_INITIALIZE:
1153                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS))
1154                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1155                         else
1156                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1157                         port->sm_vars &= ~AD_PORT_SELECTED;
1158                         __record_default(port);
1159                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1160                         port->sm_rx_state = AD_RX_PORT_DISABLED;
1161 
1162                         /* Fall Through */
1163                 case AD_RX_PORT_DISABLED:
1164                         port->sm_vars &= ~AD_PORT_MATCHED;
1165                         break;
1166                 case AD_RX_LACP_DISABLED:
1167                         port->sm_vars &= ~AD_PORT_SELECTED;
1168                         __record_default(port);
1169                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1170                         port->sm_vars |= AD_PORT_MATCHED;
1171                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1172                         break;
1173                 case AD_RX_EXPIRED:
1174                         /* Reset of the Synchronization flag (Standard 43.4.12)
1175                          * This reset cause to disable this port in the
1176                          * COLLECTING_DISTRIBUTING state of the mux machine in
1177                          * case of EXPIRED even if LINK_DOWN didn't arrive for
1178                          * the port.
1179                          */
1180                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1181                         port->sm_vars &= ~AD_PORT_MATCHED;
1182                         port->partner_oper.port_state |= AD_STATE_LACP_TIMEOUT;
1183                         port->partner_oper.port_state |= AD_STATE_LACP_ACTIVITY;
1184                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1185                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1186                         port->sm_vars |= AD_PORT_CHURNED;
1187                         break;
1188                 case AD_RX_DEFAULTED:
1189                         __update_default_selected(port);
1190                         __record_default(port);
1191                         port->sm_vars |= AD_PORT_MATCHED;
1192                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1193                         break;
1194                 case AD_RX_CURRENT:
1195                         /* detect loopback situation */
1196                         if (MAC_ADDRESS_EQUAL(&(lacpdu->actor_system),
1197                                               &(port->actor_system))) {
1198                                 slave_err(port->slave->bond->dev, port->slave->dev, "An illegal loopback occurred on slave\n"
1199                                           "Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports\n");
1200                                 return;
1201                         }
1202                         __update_selected(lacpdu, port);
1203                         __update_ntt(lacpdu, port);
1204                         __record_pdu(lacpdu, port);
1205                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1206                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1207                         break;
1208                 default:
1209                         break;
1210                 }
1211         }
1212 }
1213 
1214 /**
1215  * ad_churn_machine - handle port churn's state machine
1216  * @port: the port we're looking at
1217  *
1218  */
1219 static void ad_churn_machine(struct port *port)
1220 {
1221         if (port->sm_vars & AD_PORT_CHURNED) {
1222                 port->sm_vars &= ~AD_PORT_CHURNED;
1223                 port->sm_churn_actor_state = AD_CHURN_MONITOR;
1224                 port->sm_churn_partner_state = AD_CHURN_MONITOR;
1225                 port->sm_churn_actor_timer_counter =
1226                         __ad_timer_to_ticks(AD_ACTOR_CHURN_TIMER, 0);
1227                 port->sm_churn_partner_timer_counter =
1228                          __ad_timer_to_ticks(AD_PARTNER_CHURN_TIMER, 0);
1229                 return;
1230         }
1231         if (port->sm_churn_actor_timer_counter &&
1232             !(--port->sm_churn_actor_timer_counter) &&
1233             port->sm_churn_actor_state == AD_CHURN_MONITOR) {
1234                 if (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION) {
1235                         port->sm_churn_actor_state = AD_NO_CHURN;
1236                 } else {
1237                         port->churn_actor_count++;
1238                         port->sm_churn_actor_state = AD_CHURN;
1239                 }
1240         }
1241         if (port->sm_churn_partner_timer_counter &&
1242             !(--port->sm_churn_partner_timer_counter) &&
1243             port->sm_churn_partner_state == AD_CHURN_MONITOR) {
1244                 if (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) {
1245                         port->sm_churn_partner_state = AD_NO_CHURN;
1246                 } else {
1247                         port->churn_partner_count++;
1248                         port->sm_churn_partner_state = AD_CHURN;
1249                 }
1250         }
1251 }
1252 
1253 /**
1254  * ad_tx_machine - handle a port's tx state machine
1255  * @port: the port we're looking at
1256  */
1257 static void ad_tx_machine(struct port *port)
1258 {
1259         /* check if tx timer expired, to verify that we do not send more than
1260          * 3 packets per second
1261          */
1262         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1263                 /* check if there is something to send */
1264                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1265                         __update_lacpdu_from_port(port);
1266 
1267                         if (ad_lacpdu_send(port) >= 0) {
1268                                 slave_dbg(port->slave->bond->dev,
1269                                           port->slave->dev,
1270                                           "Sent LACPDU on port %d\n",
1271                                           port->actor_port_number);
1272 
1273                                 /* mark ntt as false, so it will not be sent
1274                                  * again until demanded
1275                                  */
1276                                 port->ntt = false;
1277                         }
1278                 }
1279                 /* restart tx timer(to verify that we will not exceed
1280                  * AD_MAX_TX_IN_SECOND
1281                  */
1282                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1283         }
1284 }
1285 
1286 /**
1287  * ad_periodic_machine - handle a port's periodic state machine
1288  * @port: the port we're looking at
1289  *
1290  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1291  */
1292 static void ad_periodic_machine(struct port *port)
1293 {
1294         periodic_states_t last_state;
1295 
1296         /* keep current state machine state to compare later if it was changed */
1297         last_state = port->sm_periodic_state;
1298 
1299         /* check if port was reinitialized */
1300         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1301             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1302            ) {
1303                 port->sm_periodic_state = AD_NO_PERIODIC;
1304         }
1305         /* check if state machine should change state */
1306         else if (port->sm_periodic_timer_counter) {
1307                 /* check if periodic state machine expired */
1308                 if (!(--port->sm_periodic_timer_counter)) {
1309                         /* if expired then do tx */
1310                         port->sm_periodic_state = AD_PERIODIC_TX;
1311                 } else {
1312                         /* If not expired, check if there is some new timeout
1313                          * parameter from the partner state
1314                          */
1315                         switch (port->sm_periodic_state) {
1316                         case AD_FAST_PERIODIC:
1317                                 if (!(port->partner_oper.port_state
1318                                       & AD_STATE_LACP_TIMEOUT))
1319                                         port->sm_periodic_state = AD_SLOW_PERIODIC;
1320                                 break;
1321                         case AD_SLOW_PERIODIC:
1322                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1323                                         port->sm_periodic_timer_counter = 0;
1324                                         port->sm_periodic_state = AD_PERIODIC_TX;
1325                                 }
1326                                 break;
1327                         default:
1328                                 break;
1329                         }
1330                 }
1331         } else {
1332                 switch (port->sm_periodic_state) {
1333                 case AD_NO_PERIODIC:
1334                         port->sm_periodic_state = AD_FAST_PERIODIC;
1335                         break;
1336                 case AD_PERIODIC_TX:
1337                         if (!(port->partner_oper.port_state &
1338                             AD_STATE_LACP_TIMEOUT))
1339                                 port->sm_periodic_state = AD_SLOW_PERIODIC;
1340                         else
1341                                 port->sm_periodic_state = AD_FAST_PERIODIC;
1342                         break;
1343                 default:
1344                         break;
1345                 }
1346         }
1347 
1348         /* check if the state machine was changed */
1349         if (port->sm_periodic_state != last_state) {
1350                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1351                           "Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n",
1352                           port->actor_port_number, last_state,
1353                           port->sm_periodic_state);
1354                 switch (port->sm_periodic_state) {
1355                 case AD_NO_PERIODIC:
1356                         port->sm_periodic_timer_counter = 0;
1357                         break;
1358                 case AD_FAST_PERIODIC:
1359                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1360                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1;
1361                         break;
1362                 case AD_SLOW_PERIODIC:
1363                         /* decrement 1 tick we lost in the PERIODIC_TX cycle */
1364                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1;
1365                         break;
1366                 case AD_PERIODIC_TX:
1367                         port->ntt = true;
1368                         break;
1369                 default:
1370                         break;
1371                 }
1372         }
1373 }
1374 
1375 /**
1376  * ad_port_selection_logic - select aggregation groups
1377  * @port: the port we're looking at
1378  * @update_slave_arr: Does slave array need update?
1379  *
1380  * Select aggregation groups, and assign each port for it's aggregetor. The
1381  * selection logic is called in the inititalization (after all the handshkes),
1382  * and after every lacpdu receive (if selected is off).
1383  */
1384 static void ad_port_selection_logic(struct port *port, bool *update_slave_arr)
1385 {
1386         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1387         struct port *last_port = NULL, *curr_port;
1388         struct list_head *iter;
1389         struct bonding *bond;
1390         struct slave *slave;
1391         int found = 0;
1392 
1393         /* if the port is already Selected, do nothing */
1394         if (port->sm_vars & AD_PORT_SELECTED)
1395                 return;
1396 
1397         bond = __get_bond_by_port(port);
1398 
1399         /* if the port is connected to other aggregator, detach it */
1400         if (port->aggregator) {
1401                 /* detach the port from its former aggregator */
1402                 temp_aggregator = port->aggregator;
1403                 for (curr_port = temp_aggregator->lag_ports; curr_port;
1404                      last_port = curr_port,
1405                      curr_port = curr_port->next_port_in_aggregator) {
1406                         if (curr_port == port) {
1407                                 temp_aggregator->num_of_ports--;
1408                                 /* if it is the first port attached to the
1409                                  * aggregator
1410                                  */
1411                                 if (!last_port) {
1412                                         temp_aggregator->lag_ports =
1413                                                 port->next_port_in_aggregator;
1414                                 } else {
1415                                         /* not the first port attached to the
1416                                          * aggregator
1417                                          */
1418                                         last_port->next_port_in_aggregator =
1419                                                 port->next_port_in_aggregator;
1420                                 }
1421 
1422                                 /* clear the port's relations to this
1423                                  * aggregator
1424                                  */
1425                                 port->aggregator = NULL;
1426                                 port->next_port_in_aggregator = NULL;
1427                                 port->actor_port_aggregator_identifier = 0;
1428 
1429                                 slave_dbg(bond->dev, port->slave->dev, "Port %d left LAG %d\n",
1430                                           port->actor_port_number,
1431                                           temp_aggregator->aggregator_identifier);
1432                                 /* if the aggregator is empty, clear its
1433                                  * parameters, and set it ready to be attached
1434                                  */
1435                                 if (!temp_aggregator->lag_ports)
1436                                         ad_clear_agg(temp_aggregator);
1437                                 break;
1438                         }
1439                 }
1440                 if (!curr_port) {
1441                         /* meaning: the port was related to an aggregator
1442                          * but was not on the aggregator port list
1443                          */
1444                         net_warn_ratelimited("%s: (slave %s): Warning: Port %d was related to aggregator %d but was not on its port list\n",
1445                                              port->slave->bond->dev->name,
1446                                              port->slave->dev->name,
1447                                              port->actor_port_number,
1448                                              port->aggregator->aggregator_identifier);
1449                 }
1450         }
1451         /* search on all aggregators for a suitable aggregator for this port */
1452         bond_for_each_slave(bond, slave, iter) {
1453                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
1454 
1455                 /* keep a free aggregator for later use(if needed) */
1456                 if (!aggregator->lag_ports) {
1457                         if (!free_aggregator)
1458                                 free_aggregator = aggregator;
1459                         continue;
1460                 }
1461                 /* check if current aggregator suits us */
1462                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && /* if all parameters match AND */
1463                      MAC_ADDRESS_EQUAL(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1464                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1465                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1466                     ) &&
1467                     ((!MAC_ADDRESS_EQUAL(&(port->partner_oper.system), &(null_mac_addr)) && /* partner answers */
1468                       !aggregator->is_individual)  /* but is not individual OR */
1469                     )
1470                    ) {
1471                         /* attach to the founded aggregator */
1472                         port->aggregator = aggregator;
1473                         port->actor_port_aggregator_identifier =
1474                                 port->aggregator->aggregator_identifier;
1475                         port->next_port_in_aggregator = aggregator->lag_ports;
1476                         port->aggregator->num_of_ports++;
1477                         aggregator->lag_ports = port;
1478                         slave_dbg(bond->dev, slave->dev, "Port %d joined LAG %d (existing LAG)\n",
1479                                   port->actor_port_number,
1480                                   port->aggregator->aggregator_identifier);
1481 
1482                         /* mark this port as selected */
1483                         port->sm_vars |= AD_PORT_SELECTED;
1484                         found = 1;
1485                         break;
1486                 }
1487         }
1488 
1489         /* the port couldn't find an aggregator - attach it to a new
1490          * aggregator
1491          */
1492         if (!found) {
1493                 if (free_aggregator) {
1494                         /* assign port a new aggregator */
1495                         port->aggregator = free_aggregator;
1496                         port->actor_port_aggregator_identifier =
1497                                 port->aggregator->aggregator_identifier;
1498 
1499                         /* update the new aggregator's parameters
1500                          * if port was responsed from the end-user
1501                          */
1502                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_MASKS)
1503                                 /* if port is full duplex */
1504                                 port->aggregator->is_individual = false;
1505                         else
1506                                 port->aggregator->is_individual = true;
1507 
1508                         port->aggregator->actor_admin_aggregator_key =
1509                                 port->actor_admin_port_key;
1510                         port->aggregator->actor_oper_aggregator_key =
1511                                 port->actor_oper_port_key;
1512                         port->aggregator->partner_system =
1513                                 port->partner_oper.system;
1514                         port->aggregator->partner_system_priority =
1515                                 port->partner_oper.system_priority;
1516                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1517                         port->aggregator->receive_state = 1;
1518                         port->aggregator->transmit_state = 1;
1519                         port->aggregator->lag_ports = port;
1520                         port->aggregator->num_of_ports++;
1521 
1522                         /* mark this port as selected */
1523                         port->sm_vars |= AD_PORT_SELECTED;
1524 
1525                         slave_dbg(bond->dev, port->slave->dev, "Port %d joined LAG %d (new LAG)\n",
1526                                   port->actor_port_number,
1527                                   port->aggregator->aggregator_identifier);
1528                 } else {
1529                         slave_err(bond->dev, port->slave->dev,
1530                                   "Port %d did not find a suitable aggregator\n",
1531                                   port->actor_port_number);
1532                 }
1533         }
1534         /* if all aggregator's ports are READY_N == TRUE, set ready=TRUE
1535          * in all aggregator's ports, else set ready=FALSE in all
1536          * aggregator's ports
1537          */
1538         __set_agg_ports_ready(port->aggregator,
1539                               __agg_ports_are_ready(port->aggregator));
1540 
1541         aggregator = __get_first_agg(port);
1542         ad_agg_selection_logic(aggregator, update_slave_arr);
1543 
1544         if (!port->aggregator->is_active)
1545                 port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1546 }
1547 
1548 /* Decide if "agg" is a better choice for the new active aggregator that
1549  * the current best, according to the ad_select policy.
1550  */
1551 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1552                                                 struct aggregator *curr)
1553 {
1554         /* 0. If no best, select current.
1555          *
1556          * 1. If the current agg is not individual, and the best is
1557          *    individual, select current.
1558          *
1559          * 2. If current agg is individual and the best is not, keep best.
1560          *
1561          * 3. Therefore, current and best are both individual or both not
1562          *    individual, so:
1563          *
1564          * 3a. If current agg partner replied, and best agg partner did not,
1565          *     select current.
1566          *
1567          * 3b. If current agg partner did not reply and best agg partner
1568          *     did reply, keep best.
1569          *
1570          * 4.  Therefore, current and best both have partner replies or
1571          *     both do not, so perform selection policy:
1572          *
1573          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1574          *     select by bandwidth.
1575          *
1576          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1577          */
1578         if (!best)
1579                 return curr;
1580 
1581         if (!curr->is_individual && best->is_individual)
1582                 return curr;
1583 
1584         if (curr->is_individual && !best->is_individual)
1585                 return best;
1586 
1587         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1588                 return curr;
1589 
1590         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1591                 return best;
1592 
1593         switch (__get_agg_selection_mode(curr->lag_ports)) {
1594         case BOND_AD_COUNT:
1595                 if (__agg_active_ports(curr) > __agg_active_ports(best))
1596                         return curr;
1597 
1598                 if (__agg_active_ports(curr) < __agg_active_ports(best))
1599                         return best;
1600 
1601                 /*FALLTHROUGH*/
1602         case BOND_AD_STABLE:
1603         case BOND_AD_BANDWIDTH:
1604                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1605                         return curr;
1606 
1607                 break;
1608 
1609         default:
1610                 net_warn_ratelimited("%s: (slave %s): Impossible agg select mode %d\n",
1611                                      curr->slave->bond->dev->name,
1612                                      curr->slave->dev->name,
1613                                      __get_agg_selection_mode(curr->lag_ports));
1614                 break;
1615         }
1616 
1617         return best;
1618 }
1619 
1620 static int agg_device_up(const struct aggregator *agg)
1621 {
1622         struct port *port = agg->lag_ports;
1623 
1624         if (!port)
1625                 return 0;
1626 
1627         for (port = agg->lag_ports; port;
1628              port = port->next_port_in_aggregator) {
1629                 if (netif_running(port->slave->dev) &&
1630                     netif_carrier_ok(port->slave->dev))
1631                         return 1;
1632         }
1633 
1634         return 0;
1635 }
1636 
1637 /**
1638  * ad_agg_selection_logic - select an aggregation group for a team
1639  * @aggregator: the aggregator we're looking at
1640  * @update_slave_arr: Does slave array need update?
1641  *
1642  * It is assumed that only one aggregator may be selected for a team.
1643  *
1644  * The logic of this function is to select the aggregator according to
1645  * the ad_select policy:
1646  *
1647  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1648  * it, and to reselect the active aggregator only if the previous
1649  * aggregator has no more ports related to it.
1650  *
1651  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1652  * bandwidth, and reselect whenever a link state change takes place or the
1653  * set of slaves in the bond changes.
1654  *
1655  * BOND_AD_COUNT: select the aggregator with largest number of ports
1656  * (slaves), and reselect whenever a link state change takes place or the
1657  * set of slaves in the bond changes.
1658  *
1659  * FIXME: this function MUST be called with the first agg in the bond, or
1660  * __get_active_agg() won't work correctly. This function should be better
1661  * called with the bond itself, and retrieve the first agg from it.
1662  */
1663 static void ad_agg_selection_logic(struct aggregator *agg,
1664                                    bool *update_slave_arr)
1665 {
1666         struct aggregator *best, *active, *origin;
1667         struct bonding *bond = agg->slave->bond;
1668         struct list_head *iter;
1669         struct slave *slave;
1670         struct port *port;
1671 
1672         rcu_read_lock();
1673         origin = agg;
1674         active = __get_active_agg(agg);
1675         best = (active && agg_device_up(active)) ? active : NULL;
1676 
1677         bond_for_each_slave_rcu(bond, slave, iter) {
1678                 agg = &(SLAVE_AD_INFO(slave)->aggregator);
1679 
1680                 agg->is_active = 0;
1681 
1682                 if (__agg_active_ports(agg) && agg_device_up(agg))
1683                         best = ad_agg_selection_test(best, agg);
1684         }
1685 
1686         if (best &&
1687             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1688                 /* For the STABLE policy, don't replace the old active
1689                  * aggregator if it's still active (it has an answering
1690                  * partner) or if both the best and active don't have an
1691                  * answering partner.
1692                  */
1693                 if (active && active->lag_ports &&
1694                     __agg_active_ports(active) &&
1695                     (__agg_has_partner(active) ||
1696                      (!__agg_has_partner(active) &&
1697                      !__agg_has_partner(best)))) {
1698                         if (!(!active->actor_oper_aggregator_key &&
1699                               best->actor_oper_aggregator_key)) {
1700                                 best = NULL;
1701                                 active->is_active = 1;
1702                         }
1703                 }
1704         }
1705 
1706         if (best && (best == active)) {
1707                 best = NULL;
1708                 active->is_active = 1;
1709         }
1710 
1711         /* if there is new best aggregator, activate it */
1712         if (best) {
1713                 netdev_dbg(bond->dev, "(slave %s): best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1714                            best->slave ? best->slave->dev->name : "NULL",
1715                            best->aggregator_identifier, best->num_of_ports,
1716                            best->actor_oper_aggregator_key,
1717                            best->partner_oper_aggregator_key,
1718                            best->is_individual, best->is_active);
1719                 netdev_dbg(bond->dev, "(slave %s): best ports %p slave %p\n",
1720                            best->slave ? best->slave->dev->name : "NULL",
1721                            best->lag_ports, best->slave);
1722 
1723                 bond_for_each_slave_rcu(bond, slave, iter) {
1724                         agg = &(SLAVE_AD_INFO(slave)->aggregator);
1725 
1726                         slave_dbg(bond->dev, slave->dev, "Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1727                                   agg->aggregator_identifier, agg->num_of_ports,
1728                                   agg->actor_oper_aggregator_key,
1729                                   agg->partner_oper_aggregator_key,
1730                                   agg->is_individual, agg->is_active);
1731                 }
1732 
1733                 /* check if any partner replies */
1734                 if (best->is_individual)
1735                         net_warn_ratelimited("%s: Warning: No 802.3ad response from the link partner for any adapters in the bond\n",
1736                                              bond->dev->name);
1737 
1738                 best->is_active = 1;
1739                 netdev_dbg(bond->dev, "(slave %s): LAG %d chosen as the active LAG\n",
1740                            best->slave ? best->slave->dev->name : "NULL",
1741                            best->aggregator_identifier);
1742                 netdev_dbg(bond->dev, "(slave %s): Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1743                            best->slave ? best->slave->dev->name : "NULL",
1744                            best->aggregator_identifier, best->num_of_ports,
1745                            best->actor_oper_aggregator_key,
1746                            best->partner_oper_aggregator_key,
1747                            best->is_individual, best->is_active);
1748 
1749                 /* disable the ports that were related to the former
1750                  * active_aggregator
1751                  */
1752                 if (active) {
1753                         for (port = active->lag_ports; port;
1754                              port = port->next_port_in_aggregator) {
1755                                 __disable_port(port);
1756                         }
1757                 }
1758                 /* Slave array needs update. */
1759                 *update_slave_arr = true;
1760         }
1761 
1762         /* if the selected aggregator is of join individuals
1763          * (partner_system is NULL), enable their ports
1764          */
1765         active = __get_active_agg(origin);
1766 
1767         if (active) {
1768                 if (!__agg_has_partner(active)) {
1769                         for (port = active->lag_ports; port;
1770                              port = port->next_port_in_aggregator) {
1771                                 __enable_port(port);
1772                         }
1773                 }
1774         }
1775 
1776         rcu_read_unlock();
1777 
1778         bond_3ad_set_carrier(bond);
1779 }
1780 
1781 /**
1782  * ad_clear_agg - clear a given aggregator's parameters
1783  * @aggregator: the aggregator we're looking at
1784  */
1785 static void ad_clear_agg(struct aggregator *aggregator)
1786 {
1787         if (aggregator) {
1788                 aggregator->is_individual = false;
1789                 aggregator->actor_admin_aggregator_key = 0;
1790                 aggregator->actor_oper_aggregator_key = 0;
1791                 eth_zero_addr(aggregator->partner_system.mac_addr_value);
1792                 aggregator->partner_system_priority = 0;
1793                 aggregator->partner_oper_aggregator_key = 0;
1794                 aggregator->receive_state = 0;
1795                 aggregator->transmit_state = 0;
1796                 aggregator->lag_ports = NULL;
1797                 aggregator->is_active = 0;
1798                 aggregator->num_of_ports = 0;
1799                 pr_debug("%s: LAG %d was cleared\n",
1800                          aggregator->slave ?
1801                          aggregator->slave->dev->name : "NULL",
1802                          aggregator->aggregator_identifier);
1803         }
1804 }
1805 
1806 /**
1807  * ad_initialize_agg - initialize a given aggregator's parameters
1808  * @aggregator: the aggregator we're looking at
1809  */
1810 static void ad_initialize_agg(struct aggregator *aggregator)
1811 {
1812         if (aggregator) {
1813                 ad_clear_agg(aggregator);
1814 
1815                 eth_zero_addr(aggregator->aggregator_mac_address.mac_addr_value);
1816                 aggregator->aggregator_identifier = 0;
1817                 aggregator->slave = NULL;
1818         }
1819 }
1820 
1821 /**
1822  * ad_initialize_port - initialize a given port's parameters
1823  * @aggregator: the aggregator we're looking at
1824  * @lacp_fast: boolean. whether fast periodic should be used
1825  */
1826 static void ad_initialize_port(struct port *port, int lacp_fast)
1827 {
1828         static const struct port_params tmpl = {
1829                 .system_priority = 0xffff,
1830                 .key             = 1,
1831                 .port_number     = 1,
1832                 .port_priority   = 0xff,
1833                 .port_state      = 1,
1834         };
1835         static const struct lacpdu lacpdu = {
1836                 .subtype                = 0x01,
1837                 .version_number = 0x01,
1838                 .tlv_type_actor_info = 0x01,
1839                 .actor_information_length = 0x14,
1840                 .tlv_type_partner_info = 0x02,
1841                 .partner_information_length = 0x14,
1842                 .tlv_type_collector_info = 0x03,
1843                 .collector_information_length = 0x10,
1844                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1845         };
1846 
1847         if (port) {
1848                 port->actor_port_priority = 0xff;
1849                 port->actor_port_aggregator_identifier = 0;
1850                 port->ntt = false;
1851                 port->actor_admin_port_state = AD_STATE_AGGREGATION |
1852                                                AD_STATE_LACP_ACTIVITY;
1853                 port->actor_oper_port_state  = AD_STATE_AGGREGATION |
1854                                                AD_STATE_LACP_ACTIVITY;
1855 
1856                 if (lacp_fast)
1857                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1858 
1859                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1860                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1861 
1862                 port->is_enabled = true;
1863                 /* private parameters */
1864                 port->sm_vars = AD_PORT_BEGIN | AD_PORT_LACP_ENABLED;
1865                 port->sm_rx_state = 0;
1866                 port->sm_rx_timer_counter = 0;
1867                 port->sm_periodic_state = 0;
1868                 port->sm_periodic_timer_counter = 0;
1869                 port->sm_mux_state = 0;
1870                 port->sm_mux_timer_counter = 0;
1871                 port->sm_tx_state = 0;
1872                 port->aggregator = NULL;
1873                 port->next_port_in_aggregator = NULL;
1874                 port->transaction_id = 0;
1875 
1876                 port->sm_churn_actor_timer_counter = 0;
1877                 port->sm_churn_actor_state = 0;
1878                 port->churn_actor_count = 0;
1879                 port->sm_churn_partner_timer_counter = 0;
1880                 port->sm_churn_partner_state = 0;
1881                 port->churn_partner_count = 0;
1882 
1883                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1884         }
1885 }
1886 
1887 /**
1888  * ad_enable_collecting_distributing - enable a port's transmit/receive
1889  * @port: the port we're looking at
1890  * @update_slave_arr: Does slave array need update?
1891  *
1892  * Enable @port if it's in an active aggregator
1893  */
1894 static void ad_enable_collecting_distributing(struct port *port,
1895                                               bool *update_slave_arr)
1896 {
1897         if (port->aggregator->is_active) {
1898                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1899                           "Enabling port %d (LAG %d)\n",
1900                           port->actor_port_number,
1901                           port->aggregator->aggregator_identifier);
1902                 __enable_port(port);
1903                 /* Slave array needs update */
1904                 *update_slave_arr = true;
1905         }
1906 }
1907 
1908 /**
1909  * ad_disable_collecting_distributing - disable a port's transmit/receive
1910  * @port: the port we're looking at
1911  * @update_slave_arr: Does slave array need update?
1912  */
1913 static void ad_disable_collecting_distributing(struct port *port,
1914                                                bool *update_slave_arr)
1915 {
1916         if (port->aggregator &&
1917             !MAC_ADDRESS_EQUAL(&(port->aggregator->partner_system),
1918                                &(null_mac_addr))) {
1919                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1920                           "Disabling port %d (LAG %d)\n",
1921                           port->actor_port_number,
1922                           port->aggregator->aggregator_identifier);
1923                 __disable_port(port);
1924                 /* Slave array needs an update */
1925                 *update_slave_arr = true;
1926         }
1927 }
1928 
1929 /**
1930  * ad_marker_info_received - handle receive of a Marker information frame
1931  * @marker_info: Marker info received
1932  * @port: the port we're looking at
1933  */
1934 static void ad_marker_info_received(struct bond_marker *marker_info,
1935                                     struct port *port)
1936 {
1937         struct bond_marker marker;
1938 
1939         atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_rx);
1940         atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_rx);
1941 
1942         /* copy the received marker data to the response marker */
1943         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1944         /* change the marker subtype to marker response */
1945         marker.tlv_type = AD_MARKER_RESPONSE_SUBTYPE;
1946 
1947         /* send the marker response */
1948         if (ad_marker_send(port, &marker) >= 0)
1949                 slave_dbg(port->slave->bond->dev, port->slave->dev,
1950                           "Sent Marker Response on port %d\n",
1951                           port->actor_port_number);
1952 }
1953 
1954 /**
1955  * ad_marker_response_received - handle receive of a marker response frame
1956  * @marker: marker PDU received
1957  * @port: the port we're looking at
1958  *
1959  * This function does nothing since we decided not to implement send and handle
1960  * response for marker PDU's, in this stage, but only to respond to marker
1961  * information.
1962  */
1963 static void ad_marker_response_received(struct bond_marker *marker,
1964                                         struct port *port)
1965 {
1966         atomic64_inc(&SLAVE_AD_INFO(port->slave)->stats.marker_resp_rx);
1967         atomic64_inc(&BOND_AD_INFO(port->slave->bond).stats.marker_resp_rx);
1968 
1969         /* DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW */
1970 }
1971 
1972 /* ========= AD exported functions to the main bonding code ========= */
1973 
1974 /* Check aggregators status in team every T seconds */
1975 #define AD_AGGREGATOR_SELECTION_TIMER  8
1976 
1977 /**
1978  * bond_3ad_initiate_agg_selection - initate aggregator selection
1979  * @bond: bonding struct
1980  *
1981  * Set the aggregation selection timer, to initiate an agg selection in
1982  * the very near future.  Called during first initialization, and during
1983  * any down to up transitions of the bond.
1984  */
1985 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1986 {
1987         BOND_AD_INFO(bond).agg_select_timer = timeout;
1988 }
1989 
1990 /**
1991  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1992  * @bond: bonding struct to work on
1993  * @tick_resolution: tick duration (millisecond resolution)
1994  *
1995  * Can be called only after the mac address of the bond is set.
1996  */
1997 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution)
1998 {
1999         /* check that the bond is not initialized yet */
2000         if (!MAC_ADDRESS_EQUAL(&(BOND_AD_INFO(bond).system.sys_mac_addr),
2001                                 bond->dev->dev_addr)) {
2002 
2003                 BOND_AD_INFO(bond).aggregator_identifier = 0;
2004 
2005                 BOND_AD_INFO(bond).system.sys_priority =
2006                         bond->params.ad_actor_sys_prio;
2007                 if (is_zero_ether_addr(bond->params.ad_actor_system))
2008                         BOND_AD_INFO(bond).system.sys_mac_addr =
2009                             *((struct mac_addr *)bond->dev->dev_addr);
2010                 else
2011                         BOND_AD_INFO(bond).system.sys_mac_addr =
2012                             *((struct mac_addr *)bond->params.ad_actor_system);
2013 
2014                 /* initialize how many times this module is called in one
2015                  * second (should be about every 100ms)
2016                  */
2017                 ad_ticks_per_sec = tick_resolution;
2018 
2019                 bond_3ad_initiate_agg_selection(bond,
2020                                                 AD_AGGREGATOR_SELECTION_TIMER *
2021                                                 ad_ticks_per_sec);
2022         }
2023 }
2024 
2025 /**
2026  * bond_3ad_bind_slave - initialize a slave's port
2027  * @slave: slave struct to work on
2028  *
2029  * Returns:   0 on success
2030  *          < 0 on error
2031  */
2032 void bond_3ad_bind_slave(struct slave *slave)
2033 {
2034         struct bonding *bond = bond_get_bond_by_slave(slave);
2035         struct port *port;
2036         struct aggregator *aggregator;
2037 
2038         /* check that the slave has not been initialized yet. */
2039         if (SLAVE_AD_INFO(slave)->port.slave != slave) {
2040 
2041                 /* port initialization */
2042                 port = &(SLAVE_AD_INFO(slave)->port);
2043 
2044                 ad_initialize_port(port, bond->params.lacp_fast);
2045 
2046                 port->slave = slave;
2047                 port->actor_port_number = SLAVE_AD_INFO(slave)->id;
2048                 /* key is determined according to the link speed, duplex and
2049                  * user key
2050                  */
2051                 port->actor_admin_port_key = bond->params.ad_user_port_key << 6;
2052                 ad_update_actor_keys(port, false);
2053                 /* actor system is the bond's system */
2054                 __ad_actor_update_port(port);
2055                 /* tx timer(to verify that no more than MAX_TX_IN_SECOND
2056                  * lacpdu's are sent in one second)
2057                  */
2058                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
2059 
2060                 __disable_port(port);
2061 
2062                 /* aggregator initialization */
2063                 aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2064 
2065                 ad_initialize_agg(aggregator);
2066 
2067                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
2068                 aggregator->aggregator_identifier = ++BOND_AD_INFO(bond).aggregator_identifier;
2069                 aggregator->slave = slave;
2070                 aggregator->is_active = 0;
2071                 aggregator->num_of_ports = 0;
2072         }
2073 }
2074 
2075 /**
2076  * bond_3ad_unbind_slave - deinitialize a slave's port
2077  * @slave: slave struct to work on
2078  *
2079  * Search for the aggregator that is related to this port, remove the
2080  * aggregator and assign another aggregator for other port related to it
2081  * (if any), and remove the port.
2082  */
2083 void bond_3ad_unbind_slave(struct slave *slave)
2084 {
2085         struct port *port, *prev_port, *temp_port;
2086         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
2087         int select_new_active_agg = 0;
2088         struct bonding *bond = slave->bond;
2089         struct slave *slave_iter;
2090         struct list_head *iter;
2091         bool dummy_slave_update; /* Ignore this value as caller updates array */
2092 
2093         /* Sync against bond_3ad_state_machine_handler() */
2094         spin_lock_bh(&bond->mode_lock);
2095         aggregator = &(SLAVE_AD_INFO(slave)->aggregator);
2096         port = &(SLAVE_AD_INFO(slave)->port);
2097 
2098         /* if slave is null, the whole port is not initialized */
2099         if (!port->slave) {
2100                 slave_warn(bond->dev, slave->dev, "Trying to unbind an uninitialized port\n");
2101                 goto out;
2102         }
2103 
2104         slave_dbg(bond->dev, slave->dev, "Unbinding Link Aggregation Group %d\n",
2105                   aggregator->aggregator_identifier);
2106 
2107         /* Tell the partner that this port is not suitable for aggregation */
2108         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
2109         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
2110         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
2111         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
2112         __update_lacpdu_from_port(port);
2113         ad_lacpdu_send(port);
2114 
2115         /* check if this aggregator is occupied */
2116         if (aggregator->lag_ports) {
2117                 /* check if there are other ports related to this aggregator
2118                  * except the port related to this slave(thats ensure us that
2119                  * there is a reason to search for new aggregator, and that we
2120                  * will find one
2121                  */
2122                 if ((aggregator->lag_ports != port) ||
2123                     (aggregator->lag_ports->next_port_in_aggregator)) {
2124                         /* find new aggregator for the related port(s) */
2125                         bond_for_each_slave(bond, slave_iter, iter) {
2126                                 new_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2127                                 /* if the new aggregator is empty, or it is
2128                                  * connected to our port only
2129                                  */
2130                                 if (!new_aggregator->lag_ports ||
2131                                     ((new_aggregator->lag_ports == port) &&
2132                                      !new_aggregator->lag_ports->next_port_in_aggregator))
2133                                         break;
2134                         }
2135                         if (!slave_iter)
2136                                 new_aggregator = NULL;
2137 
2138                         /* if new aggregator found, copy the aggregator's
2139                          * parameters and connect the related lag_ports to the
2140                          * new aggregator
2141                          */
2142                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
2143                                 slave_dbg(bond->dev, slave->dev, "Some port(s) related to LAG %d - replacing with LAG %d\n",
2144                                           aggregator->aggregator_identifier,
2145                                           new_aggregator->aggregator_identifier);
2146 
2147                                 if ((new_aggregator->lag_ports == port) &&
2148                                     new_aggregator->is_active) {
2149                                         slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2150                                         select_new_active_agg = 1;
2151                                 }
2152 
2153                                 new_aggregator->is_individual = aggregator->is_individual;
2154                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
2155                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2156                                 new_aggregator->partner_system = aggregator->partner_system;
2157                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2158                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2159                                 new_aggregator->receive_state = aggregator->receive_state;
2160                                 new_aggregator->transmit_state = aggregator->transmit_state;
2161                                 new_aggregator->lag_ports = aggregator->lag_ports;
2162                                 new_aggregator->is_active = aggregator->is_active;
2163                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2164 
2165                                 /* update the information that is written on
2166                                  * the ports about the aggregator
2167                                  */
2168                                 for (temp_port = aggregator->lag_ports; temp_port;
2169                                      temp_port = temp_port->next_port_in_aggregator) {
2170                                         temp_port->aggregator = new_aggregator;
2171                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2172                                 }
2173 
2174                                 ad_clear_agg(aggregator);
2175 
2176                                 if (select_new_active_agg)
2177                                         ad_agg_selection_logic(__get_first_agg(port),
2178                                                                &dummy_slave_update);
2179                         } else {
2180                                 slave_warn(bond->dev, slave->dev, "unbinding aggregator, and could not find a new aggregator for its ports\n");
2181                         }
2182                 } else {
2183                         /* in case that the only port related to this
2184                          * aggregator is the one we want to remove
2185                          */
2186                         select_new_active_agg = aggregator->is_active;
2187                         ad_clear_agg(aggregator);
2188                         if (select_new_active_agg) {
2189                                 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2190                                 /* select new active aggregator */
2191                                 temp_aggregator = __get_first_agg(port);
2192                                 if (temp_aggregator)
2193                                         ad_agg_selection_logic(temp_aggregator,
2194                                                                &dummy_slave_update);
2195                         }
2196                 }
2197         }
2198 
2199         slave_dbg(bond->dev, slave->dev, "Unbinding port %d\n", port->actor_port_number);
2200 
2201         /* find the aggregator that this port is connected to */
2202         bond_for_each_slave(bond, slave_iter, iter) {
2203                 temp_aggregator = &(SLAVE_AD_INFO(slave_iter)->aggregator);
2204                 prev_port = NULL;
2205                 /* search the port in the aggregator's related ports */
2206                 for (temp_port = temp_aggregator->lag_ports; temp_port;
2207                      prev_port = temp_port,
2208                      temp_port = temp_port->next_port_in_aggregator) {
2209                         if (temp_port == port) {
2210                                 /* the aggregator found - detach the port from
2211                                  * this aggregator
2212                                  */
2213                                 if (prev_port)
2214                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2215                                 else
2216                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2217                                 temp_aggregator->num_of_ports--;
2218                                 if (__agg_active_ports(temp_aggregator) == 0) {
2219                                         select_new_active_agg = temp_aggregator->is_active;
2220                                         ad_clear_agg(temp_aggregator);
2221                                         if (select_new_active_agg) {
2222                                                 slave_info(bond->dev, slave->dev, "Removing an active aggregator\n");
2223                                                 /* select new active aggregator */
2224                                                 ad_agg_selection_logic(__get_first_agg(port),
2225                                                                        &dummy_slave_update);
2226                                         }
2227                                 }
2228                                 break;
2229                         }
2230                 }
2231         }
2232         port->slave = NULL;
2233 
2234 out:
2235         spin_unlock_bh(&bond->mode_lock);
2236 }
2237 
2238 /**
2239  * bond_3ad_update_ad_actor_settings - reflect change of actor settings to ports
2240  * @bond: bonding struct to work on
2241  *
2242  * If an ad_actor setting gets changed we need to update the individual port
2243  * settings so the bond device will use the new values when it gets upped.
2244  */
2245 void bond_3ad_update_ad_actor_settings(struct bonding *bond)
2246 {
2247         struct list_head *iter;
2248         struct slave *slave;
2249 
2250         ASSERT_RTNL();
2251 
2252         BOND_AD_INFO(bond).system.sys_priority = bond->params.ad_actor_sys_prio;
2253         if (is_zero_ether_addr(bond->params.ad_actor_system))
2254                 BOND_AD_INFO(bond).system.sys_mac_addr =
2255                     *((struct mac_addr *)bond->dev->dev_addr);
2256         else
2257                 BOND_AD_INFO(bond).system.sys_mac_addr =
2258                     *((struct mac_addr *)bond->params.ad_actor_system);
2259 
2260         spin_lock_bh(&bond->mode_lock);
2261         bond_for_each_slave(bond, slave, iter) {
2262                 struct port *port = &(SLAVE_AD_INFO(slave))->port;
2263 
2264                 __ad_actor_update_port(port);
2265                 port->ntt = true;
2266         }
2267         spin_unlock_bh(&bond->mode_lock);
2268 }
2269 
2270 /**
2271  * bond_3ad_state_machine_handler - handle state machines timeout
2272  * @bond: bonding struct to work on
2273  *
2274  * The state machine handling concept in this module is to check every tick
2275  * which state machine should operate any function. The execution order is
2276  * round robin, so when we have an interaction between state machines, the
2277  * reply of one to each other might be delayed until next tick.
2278  *
2279  * This function also complete the initialization when the agg_select_timer
2280  * times out, and it selects an aggregator for the ports that are yet not
2281  * related to any aggregator, and selects the active aggregator for a bond.
2282  */
2283 void bond_3ad_state_machine_handler(struct work_struct *work)
2284 {
2285         struct bonding *bond = container_of(work, struct bonding,
2286                                             ad_work.work);
2287         struct aggregator *aggregator;
2288         struct list_head *iter;
2289         struct slave *slave;
2290         struct port *port;
2291         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2292         bool update_slave_arr = false;
2293 
2294         /* Lock to protect data accessed by all (e.g., port->sm_vars) and
2295          * against running with bond_3ad_unbind_slave. ad_rx_machine may run
2296          * concurrently due to incoming LACPDU as well.
2297          */
2298         spin_lock_bh(&bond->mode_lock);
2299         rcu_read_lock();
2300 
2301         /* check if there are any slaves */
2302         if (!bond_has_slaves(bond))
2303                 goto re_arm;
2304 
2305         /* check if agg_select_timer timer after initialize is timed out */
2306         if (BOND_AD_INFO(bond).agg_select_timer &&
2307             !(--BOND_AD_INFO(bond).agg_select_timer)) {
2308                 slave = bond_first_slave_rcu(bond);
2309                 port = slave ? &(SLAVE_AD_INFO(slave)->port) : NULL;
2310 
2311                 /* select the active aggregator for the bond */
2312                 if (port) {
2313                         if (!port->slave) {
2314                                 net_warn_ratelimited("%s: Warning: bond's first port is uninitialized\n",
2315                                                      bond->dev->name);
2316                                 goto re_arm;
2317                         }
2318 
2319                         aggregator = __get_first_agg(port);
2320                         ad_agg_selection_logic(aggregator, &update_slave_arr);
2321                 }
2322                 bond_3ad_set_carrier(bond);
2323         }
2324 
2325         /* for each port run the state machines */
2326         bond_for_each_slave_rcu(bond, slave, iter) {
2327                 port = &(SLAVE_AD_INFO(slave)->port);
2328                 if (!port->slave) {
2329                         net_warn_ratelimited("%s: Warning: Found an uninitialized port\n",
2330                                             bond->dev->name);
2331                         goto re_arm;
2332                 }
2333 
2334                 ad_rx_machine(NULL, port);
2335                 ad_periodic_machine(port);
2336                 ad_port_selection_logic(port, &update_slave_arr);
2337                 ad_mux_machine(port, &update_slave_arr);
2338                 ad_tx_machine(port);
2339                 ad_churn_machine(port);
2340 
2341                 /* turn off the BEGIN bit, since we already handled it */
2342                 if (port->sm_vars & AD_PORT_BEGIN)
2343                         port->sm_vars &= ~AD_PORT_BEGIN;
2344         }
2345 
2346 re_arm:
2347         bond_for_each_slave_rcu(bond, slave, iter) {
2348                 if (slave->should_notify) {
2349                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2350                         break;
2351                 }
2352         }
2353         rcu_read_unlock();
2354         spin_unlock_bh(&bond->mode_lock);
2355 
2356         if (update_slave_arr)
2357                 bond_slave_arr_work_rearm(bond, 0);
2358 
2359         if (should_notify_rtnl && rtnl_trylock()) {
2360                 bond_slave_state_notify(bond);
2361                 rtnl_unlock();
2362         }
2363         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2364 }
2365 
2366 /**
2367  * bond_3ad_rx_indication - handle a received frame
2368  * @lacpdu: received lacpdu
2369  * @slave: slave struct to work on
2370  *
2371  * It is assumed that frames that were sent on this NIC don't returned as new
2372  * received frames (loopback). Since only the payload is given to this
2373  * function, it check for loopback.
2374  */
2375 static int bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave)
2376 {
2377         struct bonding *bond = slave->bond;
2378         int ret = RX_HANDLER_ANOTHER;
2379         struct bond_marker *marker;
2380         struct port *port;
2381         atomic64_t *stat;
2382 
2383         port = &(SLAVE_AD_INFO(slave)->port);
2384         if (!port->slave) {
2385                 net_warn_ratelimited("%s: Warning: port of slave %s is uninitialized\n",
2386                                      slave->dev->name, slave->bond->dev->name);
2387                 return ret;
2388         }
2389 
2390         switch (lacpdu->subtype) {
2391         case AD_TYPE_LACPDU:
2392                 ret = RX_HANDLER_CONSUMED;
2393                 slave_dbg(slave->bond->dev, slave->dev,
2394                           "Received LACPDU on port %d\n",
2395                           port->actor_port_number);
2396                 /* Protect against concurrent state machines */
2397                 spin_lock(&slave->bond->mode_lock);
2398                 ad_rx_machine(lacpdu, port);
2399                 spin_unlock(&slave->bond->mode_lock);
2400                 break;
2401         case AD_TYPE_MARKER:
2402                 ret = RX_HANDLER_CONSUMED;
2403                 /* No need to convert fields to Little Endian since we
2404                  * don't use the marker's fields.
2405                  */
2406                 marker = (struct bond_marker *)lacpdu;
2407                 switch (marker->tlv_type) {
2408                 case AD_MARKER_INFORMATION_SUBTYPE:
2409                         slave_dbg(slave->bond->dev, slave->dev, "Received Marker Information on port %d\n",
2410                                   port->actor_port_number);
2411                         ad_marker_info_received(marker, port);
2412                         break;
2413                 case AD_MARKER_RESPONSE_SUBTYPE:
2414                         slave_dbg(slave->bond->dev, slave->dev, "Received Marker Response on port %d\n",
2415                                   port->actor_port_number);
2416                         ad_marker_response_received(marker, port);
2417                         break;
2418                 default:
2419                         slave_dbg(slave->bond->dev, slave->dev, "Received an unknown Marker subtype on port %d\n",
2420                                   port->actor_port_number);
2421                         stat = &SLAVE_AD_INFO(slave)->stats.marker_unknown_rx;
2422                         atomic64_inc(stat);
2423                         stat = &BOND_AD_INFO(bond).stats.marker_unknown_rx;
2424                         atomic64_inc(stat);
2425                 }
2426                 break;
2427         default:
2428                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_unknown_rx);
2429                 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_unknown_rx);
2430         }
2431 
2432         return ret;
2433 }
2434 
2435 /**
2436  * ad_update_actor_keys - Update the oper / admin keys for a port based on
2437  * its current speed and duplex settings.
2438  *
2439  * @port: the port we'are looking at
2440  * @reset: Boolean to just reset the speed and the duplex part of the key
2441  *
2442  * The logic to change the oper / admin keys is:
2443  * (a) A full duplex port can participate in LACP with partner.
2444  * (b) When the speed is changed, LACP need to be reinitiated.
2445  */
2446 static void ad_update_actor_keys(struct port *port, bool reset)
2447 {
2448         u8 duplex = 0;
2449         u16 ospeed = 0, speed = 0;
2450         u16 old_oper_key = port->actor_oper_port_key;
2451 
2452         port->actor_admin_port_key &= ~(AD_SPEED_KEY_MASKS|AD_DUPLEX_KEY_MASKS);
2453         if (!reset) {
2454                 speed = __get_link_speed(port);
2455                 ospeed = (old_oper_key & AD_SPEED_KEY_MASKS) >> 1;
2456                 duplex = __get_duplex(port);
2457                 port->actor_admin_port_key |= (speed << 1) | duplex;
2458         }
2459         port->actor_oper_port_key = port->actor_admin_port_key;
2460 
2461         if (old_oper_key != port->actor_oper_port_key) {
2462                 /* Only 'duplex' port participates in LACP */
2463                 if (duplex)
2464                         port->sm_vars |= AD_PORT_LACP_ENABLED;
2465                 else
2466                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
2467 
2468                 if (!reset) {
2469                         if (!speed) {
2470                                 slave_err(port->slave->bond->dev,
2471                                           port->slave->dev,
2472                                           "speed changed to 0 on port %d\n",
2473                                           port->actor_port_number);
2474                         } else if (duplex && ospeed != speed) {
2475                                 /* Speed change restarts LACP state-machine */
2476                                 port->sm_vars |= AD_PORT_BEGIN;
2477                         }
2478                 }
2479         }
2480 }
2481 
2482 /**
2483  * bond_3ad_adapter_speed_duplex_changed - handle a slave's speed / duplex
2484  * change indication
2485  *
2486  * @slave: slave struct to work on
2487  *
2488  * Handle reselection of aggregator (if needed) for this port.
2489  */
2490 void bond_3ad_adapter_speed_duplex_changed(struct slave *slave)
2491 {
2492         struct port *port;
2493 
2494         port = &(SLAVE_AD_INFO(slave)->port);
2495 
2496         /* if slave is null, the whole port is not initialized */
2497         if (!port->slave) {
2498                 slave_warn(slave->bond->dev, slave->dev,
2499                            "speed/duplex changed for uninitialized port\n");
2500                 return;
2501         }
2502 
2503         spin_lock_bh(&slave->bond->mode_lock);
2504         ad_update_actor_keys(port, false);
2505         spin_unlock_bh(&slave->bond->mode_lock);
2506         slave_dbg(slave->bond->dev, slave->dev, "Port %d changed speed/duplex\n",
2507                   port->actor_port_number);
2508 }
2509 
2510 /**
2511  * bond_3ad_handle_link_change - handle a slave's link status change indication
2512  * @slave: slave struct to work on
2513  * @status: whether the link is now up or down
2514  *
2515  * Handle reselection of aggregator (if needed) for this port.
2516  */
2517 void bond_3ad_handle_link_change(struct slave *slave, char link)
2518 {
2519         struct aggregator *agg;
2520         struct port *port;
2521         bool dummy;
2522 
2523         port = &(SLAVE_AD_INFO(slave)->port);
2524 
2525         /* if slave is null, the whole port is not initialized */
2526         if (!port->slave) {
2527                 slave_warn(slave->bond->dev, slave->dev, "link status changed for uninitialized port\n");
2528                 return;
2529         }
2530 
2531         spin_lock_bh(&slave->bond->mode_lock);
2532         /* on link down we are zeroing duplex and speed since
2533          * some of the adaptors(ce1000.lan) report full duplex/speed
2534          * instead of N/A(duplex) / 0(speed).
2535          *
2536          * on link up we are forcing recheck on the duplex and speed since
2537          * some of he adaptors(ce1000.lan) report.
2538          */
2539         if (link == BOND_LINK_UP) {
2540                 port->is_enabled = true;
2541                 ad_update_actor_keys(port, false);
2542         } else {
2543                 /* link has failed */
2544                 port->is_enabled = false;
2545                 ad_update_actor_keys(port, true);
2546         }
2547         agg = __get_first_agg(port);
2548         ad_agg_selection_logic(agg, &dummy);
2549 
2550         spin_unlock_bh(&slave->bond->mode_lock);
2551 
2552         slave_dbg(slave->bond->dev, slave->dev, "Port %d changed link status to %s\n",
2553                   port->actor_port_number,
2554                   link == BOND_LINK_UP ? "UP" : "DOWN");
2555 
2556         /* RTNL is held and mode_lock is released so it's safe
2557          * to update slave_array here.
2558          */
2559         bond_update_slave_arr(slave->bond, NULL);
2560 }
2561 
2562 /**
2563  * bond_3ad_set_carrier - set link state for bonding master
2564  * @bond - bonding structure
2565  *
2566  * if we have an active aggregator, we're up, if not, we're down.
2567  * Presumes that we cannot have an active aggregator if there are
2568  * no slaves with link up.
2569  *
2570  * This behavior complies with IEEE 802.3 section 43.3.9.
2571  *
2572  * Called by bond_set_carrier(). Return zero if carrier state does not
2573  * change, nonzero if it does.
2574  */
2575 int bond_3ad_set_carrier(struct bonding *bond)
2576 {
2577         struct aggregator *active;
2578         struct slave *first_slave;
2579         int ret = 1;
2580 
2581         rcu_read_lock();
2582         first_slave = bond_first_slave_rcu(bond);
2583         if (!first_slave) {
2584                 ret = 0;
2585                 goto out;
2586         }
2587         active = __get_active_agg(&(SLAVE_AD_INFO(first_slave)->aggregator));
2588         if (active) {
2589                 /* are enough slaves available to consider link up? */
2590                 if (__agg_active_ports(active) < bond->params.min_links) {
2591                         if (netif_carrier_ok(bond->dev)) {
2592                                 netif_carrier_off(bond->dev);
2593                                 goto out;
2594                         }
2595                 } else if (!netif_carrier_ok(bond->dev)) {
2596                         netif_carrier_on(bond->dev);
2597                         goto out;
2598                 }
2599         } else if (netif_carrier_ok(bond->dev)) {
2600                 netif_carrier_off(bond->dev);
2601         }
2602 out:
2603         rcu_read_unlock();
2604         return ret;
2605 }
2606 
2607 /**
2608  * __bond_3ad_get_active_agg_info - get information of the active aggregator
2609  * @bond: bonding struct to work on
2610  * @ad_info: ad_info struct to fill with the bond's info
2611  *
2612  * Returns:   0 on success
2613  *          < 0 on error
2614  */
2615 int __bond_3ad_get_active_agg_info(struct bonding *bond,
2616                                    struct ad_info *ad_info)
2617 {
2618         struct aggregator *aggregator = NULL;
2619         struct list_head *iter;
2620         struct slave *slave;
2621         struct port *port;
2622 
2623         bond_for_each_slave_rcu(bond, slave, iter) {
2624                 port = &(SLAVE_AD_INFO(slave)->port);
2625                 if (port->aggregator && port->aggregator->is_active) {
2626                         aggregator = port->aggregator;
2627                         break;
2628                 }
2629         }
2630 
2631         if (!aggregator)
2632                 return -1;
2633 
2634         ad_info->aggregator_id = aggregator->aggregator_identifier;
2635         ad_info->ports = __agg_active_ports(aggregator);
2636         ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2637         ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2638         ether_addr_copy(ad_info->partner_system,
2639                         aggregator->partner_system.mac_addr_value);
2640         return 0;
2641 }
2642 
2643 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2644 {
2645         int ret;
2646 
2647         rcu_read_lock();
2648         ret = __bond_3ad_get_active_agg_info(bond, ad_info);
2649         rcu_read_unlock();
2650 
2651         return ret;
2652 }
2653 
2654 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
2655                          struct slave *slave)
2656 {
2657         struct lacpdu *lacpdu, _lacpdu;
2658 
2659         if (skb->protocol != PKT_TYPE_LACPDU)
2660                 return RX_HANDLER_ANOTHER;
2661 
2662         if (!MAC_ADDRESS_EQUAL(eth_hdr(skb)->h_dest, lacpdu_mcast_addr))
2663                 return RX_HANDLER_ANOTHER;
2664 
2665         lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
2666         if (!lacpdu) {
2667                 atomic64_inc(&SLAVE_AD_INFO(slave)->stats.lacpdu_illegal_rx);
2668                 atomic64_inc(&BOND_AD_INFO(bond).stats.lacpdu_illegal_rx);
2669                 return RX_HANDLER_ANOTHER;
2670         }
2671 
2672         return bond_3ad_rx_indication(lacpdu, slave);
2673 }
2674 
2675 /**
2676  * bond_3ad_update_lacp_rate - change the lacp rate
2677  * @bond - bonding struct
2678  *
2679  * When modify lacp_rate parameter via sysfs,
2680  * update actor_oper_port_state of each port.
2681  *
2682  * Hold bond->mode_lock,
2683  * so we can modify port->actor_oper_port_state,
2684  * no matter bond is up or down.
2685  */
2686 void bond_3ad_update_lacp_rate(struct bonding *bond)
2687 {
2688         struct port *port = NULL;
2689         struct list_head *iter;
2690         struct slave *slave;
2691         int lacp_fast;
2692 
2693         lacp_fast = bond->params.lacp_fast;
2694         spin_lock_bh(&bond->mode_lock);
2695         bond_for_each_slave(bond, slave, iter) {
2696                 port = &(SLAVE_AD_INFO(slave)->port);
2697                 if (lacp_fast)
2698                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
2699                 else
2700                         port->actor_oper_port_state &= ~AD_STATE_LACP_TIMEOUT;
2701         }
2702         spin_unlock_bh(&bond->mode_lock);
2703 }
2704 
2705 size_t bond_3ad_stats_size(void)
2706 {
2707         return nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_RX */
2708                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_TX */
2709                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_UNKNOWN_RX */
2710                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_LACPDU_ILLEGAL_RX */
2711                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RX */
2712                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_TX */
2713                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_RX */
2714                nla_total_size_64bit(sizeof(u64)) + /* BOND_3AD_STAT_MARKER_RESP_TX */
2715                nla_total_size_64bit(sizeof(u64)); /* BOND_3AD_STAT_MARKER_UNKNOWN_RX */
2716 }
2717 
2718 int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats)
2719 {
2720         u64 val;
2721 
2722         val = atomic64_read(&stats->lacpdu_rx);
2723         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_RX, val,
2724                               BOND_3AD_STAT_PAD))
2725                 return -EMSGSIZE;
2726         val = atomic64_read(&stats->lacpdu_tx);
2727         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_TX, val,
2728                               BOND_3AD_STAT_PAD))
2729                 return -EMSGSIZE;
2730         val = atomic64_read(&stats->lacpdu_unknown_rx);
2731         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_UNKNOWN_RX, val,
2732                               BOND_3AD_STAT_PAD))
2733                 return -EMSGSIZE;
2734         val = atomic64_read(&stats->lacpdu_illegal_rx);
2735         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_LACPDU_ILLEGAL_RX, val,
2736                               BOND_3AD_STAT_PAD))
2737                 return -EMSGSIZE;
2738 
2739         val = atomic64_read(&stats->marker_rx);
2740         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RX, val,
2741                               BOND_3AD_STAT_PAD))
2742                 return -EMSGSIZE;
2743         val = atomic64_read(&stats->marker_tx);
2744         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_TX, val,
2745                               BOND_3AD_STAT_PAD))
2746                 return -EMSGSIZE;
2747         val = atomic64_read(&stats->marker_resp_rx);
2748         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_RX, val,
2749                               BOND_3AD_STAT_PAD))
2750                 return -EMSGSIZE;
2751         val = atomic64_read(&stats->marker_resp_tx);
2752         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_RESP_TX, val,
2753                               BOND_3AD_STAT_PAD))
2754                 return -EMSGSIZE;
2755         val = atomic64_read(&stats->marker_unknown_rx);
2756         if (nla_put_u64_64bit(skb, BOND_3AD_STAT_MARKER_UNKNOWN_RX, val,
2757                               BOND_3AD_STAT_PAD))
2758                 return -EMSGSIZE;
2759 
2760         return 0;
2761 }