net: remove needless (now buggy) & from dev->dev_addr
[linux-2.6.git] / drivers / net / bonding / bond_3ad.c
1 /*
2  * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by the Free
6  * Software Foundation; either version 2 of the License, or (at your option)
7  * any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc., 59
16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  */
22
23 #include <linux/skbuff.h>
24 #include <linux/if_ether.h>
25 #include <linux/netdevice.h>
26 #include <linux/spinlock.h>
27 #include <linux/ethtool.h>
28 #include <linux/etherdevice.h>
29 #include <linux/if_bonding.h>
30 #include <linux/pkt_sched.h>
31 #include <net/net_namespace.h>
32 #include "bonding.h"
33 #include "bond_3ad.h"
34
35 // General definitions
36 #define AD_SHORT_TIMEOUT           1
37 #define AD_LONG_TIMEOUT            0
38 #define AD_STANDBY                 0x2
39 #define AD_MAX_TX_IN_SECOND        3
40 #define AD_COLLECTOR_MAX_DELAY     0
41
42 // Timer definitions(43.4.4 in the 802.3ad standard)
43 #define AD_FAST_PERIODIC_TIME      1
44 #define AD_SLOW_PERIODIC_TIME      30
45 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
46 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
47 #define AD_CHURN_DETECTION_TIME    60
48 #define AD_AGGREGATE_WAIT_TIME     2
49
50 // Port state definitions(43.4.2.2 in the 802.3ad standard)
51 #define AD_STATE_LACP_ACTIVITY   0x1
52 #define AD_STATE_LACP_TIMEOUT    0x2
53 #define AD_STATE_AGGREGATION     0x4
54 #define AD_STATE_SYNCHRONIZATION 0x8
55 #define AD_STATE_COLLECTING      0x10
56 #define AD_STATE_DISTRIBUTING    0x20
57 #define AD_STATE_DEFAULTED       0x40
58 #define AD_STATE_EXPIRED         0x80
59
60 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
61 #define AD_PORT_BEGIN           0x1
62 #define AD_PORT_LACP_ENABLED    0x2
63 #define AD_PORT_ACTOR_CHURN     0x4
64 #define AD_PORT_PARTNER_CHURN   0x8
65 #define AD_PORT_READY           0x10
66 #define AD_PORT_READY_N         0x20
67 #define AD_PORT_MATCHED         0x40
68 #define AD_PORT_STANDBY         0x80
69 #define AD_PORT_SELECTED        0x100
70 #define AD_PORT_MOVED           0x200
71
72 // Port Key definitions
73 // key is determined according to the link speed, duplex and
74 // user key(which is yet not supported)
75 //              ------------------------------------------------------------
76 // Port key :   | User key                       |      Speed       |Duplex|
77 //              ------------------------------------------------------------
78 //              16                               6               1 0
79 #define  AD_DUPLEX_KEY_BITS    0x1
80 #define  AD_SPEED_KEY_BITS     0x3E
81 #define  AD_USER_KEY_BITS      0xFFC0
82
83 //dalloun
84 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
85 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
86 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
87 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
88 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
89 //endalloun
90
91 // compare MAC addresses
92 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
93
94 static struct mac_addr null_mac_addr = {{0, 0, 0, 0, 0, 0}};
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] = MULTICAST_LACPDU_ADDR;
99
100 // ================= main 802.3ad protocol functions ==================
101 static int ad_lacpdu_send(struct port *port);
102 static int ad_marker_send(struct port *port, struct bond_marker *marker);
103 static void ad_mux_machine(struct port *port);
104 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
105 static void ad_tx_machine(struct port *port);
106 static void ad_periodic_machine(struct port *port);
107 static void ad_port_selection_logic(struct port *port);
108 static void ad_agg_selection_logic(struct aggregator *aggregator);
109 static void ad_clear_agg(struct aggregator *aggregator);
110 static void ad_initialize_agg(struct aggregator *aggregator);
111 static void ad_initialize_port(struct port *port, int lacp_fast);
112 static void ad_enable_collecting_distributing(struct port *port);
113 static void ad_disable_collecting_distributing(struct port *port);
114 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
115 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
116
117
118 /////////////////////////////////////////////////////////////////////////////////
119 // ================= api to bonding and kernel code ==================
120 /////////////////////////////////////////////////////////////////////////////////
121
122 /**
123  * __get_bond_by_port - get the port's bonding struct
124  * @port: the port we're looking at
125  *
126  * Return @port's bonding struct, or %NULL if it can't be found.
127  */
128 static inline struct bonding *__get_bond_by_port(struct port *port)
129 {
130         if (port->slave == NULL) {
131                 return NULL;
132         }
133
134         return bond_get_bond_by_slave(port->slave);
135 }
136
137 /**
138  * __get_first_port - get the first port in the bond
139  * @bond: the bond we're looking at
140  *
141  * Return the port of the first slave in @bond, or %NULL if it can't be found.
142  */
143 static inline struct port *__get_first_port(struct bonding *bond)
144 {
145         if (bond->slave_cnt == 0) {
146                 return NULL;
147         }
148
149         return &(SLAVE_AD_INFO(bond->first_slave).port);
150 }
151
152 /**
153  * __get_next_port - get the next port in the bond
154  * @port: the port we're looking at
155  *
156  * Return the port of the slave that is next in line of @port's slave in the
157  * bond, or %NULL if it can't be found.
158  */
159 static inline struct port *__get_next_port(struct port *port)
160 {
161         struct bonding *bond = __get_bond_by_port(port);
162         struct slave *slave = port->slave;
163
164         // If there's no bond for this port, or this is the last slave
165         if ((bond == NULL) || (slave->next == bond->first_slave)) {
166                 return NULL;
167         }
168
169         return &(SLAVE_AD_INFO(slave->next).port);
170 }
171
172 /**
173  * __get_first_agg - get the first aggregator in the bond
174  * @bond: the bond we're looking at
175  *
176  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
177  * found.
178  */
179 static inline struct aggregator *__get_first_agg(struct port *port)
180 {
181         struct bonding *bond = __get_bond_by_port(port);
182
183         // If there's no bond for this port, or bond has no slaves
184         if ((bond == NULL) || (bond->slave_cnt == 0)) {
185                 return NULL;
186         }
187
188         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
189 }
190
191 /**
192  * __get_next_agg - get the next aggregator in the bond
193  * @aggregator: the aggregator we're looking at
194  *
195  * Return the aggregator of the slave that is next in line of @aggregator's
196  * slave in the bond, or %NULL if it can't be found.
197  */
198 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
199 {
200         struct slave *slave = aggregator->slave;
201         struct bonding *bond = bond_get_bond_by_slave(slave);
202
203         // If there's no bond for this aggregator, or this is the last slave
204         if ((bond == NULL) || (slave->next == bond->first_slave)) {
205                 return NULL;
206         }
207
208         return &(SLAVE_AD_INFO(slave->next).aggregator);
209 }
210
211 /*
212  * __agg_has_partner
213  *
214  * Return nonzero if aggregator has a partner (denoted by a non-zero ether
215  * address for the partner).  Return 0 if not.
216  */
217 static inline int __agg_has_partner(struct aggregator *agg)
218 {
219         return !is_zero_ether_addr(agg->partner_system.mac_addr_value);
220 }
221
222 /**
223  * __disable_port - disable the port's slave
224  * @port: the port we're looking at
225  *
226  */
227 static inline void __disable_port(struct port *port)
228 {
229         bond_set_slave_inactive_flags(port->slave);
230 }
231
232 /**
233  * __enable_port - enable the port's slave, if it's up
234  * @port: the port we're looking at
235  *
236  */
237 static inline void __enable_port(struct port *port)
238 {
239         struct slave *slave = port->slave;
240
241         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev)) {
242                 bond_set_slave_active_flags(slave);
243         }
244 }
245
246 /**
247  * __port_is_enabled - check if the port's slave is in active state
248  * @port: the port we're looking at
249  *
250  */
251 static inline int __port_is_enabled(struct port *port)
252 {
253         return(port->slave->state == BOND_STATE_ACTIVE);
254 }
255
256 /**
257  * __get_agg_selection_mode - get the aggregator selection mode
258  * @port: the port we're looking at
259  *
260  * Get the aggregator selection mode. Can be %STABLE, %BANDWIDTH or %COUNT.
261  */
262 static inline u32 __get_agg_selection_mode(struct port *port)
263 {
264         struct bonding *bond = __get_bond_by_port(port);
265
266         if (bond == NULL) {
267                 return BOND_AD_STABLE;
268         }
269
270         return BOND_AD_INFO(bond).agg_select_mode;
271 }
272
273 /**
274  * __check_agg_selection_timer - check if the selection timer has expired
275  * @port: the port we're looking at
276  *
277  */
278 static inline int __check_agg_selection_timer(struct port *port)
279 {
280         struct bonding *bond = __get_bond_by_port(port);
281
282         if (bond == NULL) {
283                 return 0;
284         }
285
286         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
287 }
288
289 /**
290  * __get_rx_machine_lock - lock the port's RX machine
291  * @port: the port we're looking at
292  *
293  */
294 static inline void __get_rx_machine_lock(struct port *port)
295 {
296         spin_lock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
297 }
298
299 /**
300  * __release_rx_machine_lock - unlock the port's RX machine
301  * @port: the port we're looking at
302  *
303  */
304 static inline void __release_rx_machine_lock(struct port *port)
305 {
306         spin_unlock_bh(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
307 }
308
309 /**
310  * __get_link_speed - get a port's speed
311  * @port: the port we're looking at
312  *
313  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
314  *     0,
315  *     %AD_LINK_SPEED_BITMASK_10MBPS,
316  *     %AD_LINK_SPEED_BITMASK_100MBPS,
317  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
318  *     %AD_LINK_SPEED_BITMASK_10000MBPS
319  */
320 static u16 __get_link_speed(struct port *port)
321 {
322         struct slave *slave = port->slave;
323         u16 speed;
324
325         /* this if covers only a special case: when the configuration starts with
326          * link down, it sets the speed to 0.
327          * This is done in spite of the fact that the e100 driver reports 0 to be
328          * compatible with MVT in the future.*/
329         if (slave->link != BOND_LINK_UP) {
330                 speed=0;
331         } else {
332                 switch (slave->speed) {
333                 case SPEED_10:
334                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
335                         break;
336
337                 case SPEED_100:
338                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
339                         break;
340
341                 case SPEED_1000:
342                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
343                         break;
344
345                 case SPEED_10000:
346                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
347                         break;
348
349                 default:
350                         speed = 0; // unknown speed value from ethtool. shouldn't happen
351                         break;
352                 }
353         }
354
355         pr_debug("Port %d Received link speed %d update from adapter\n", port->actor_port_number, speed);
356         return speed;
357 }
358
359 /**
360  * __get_duplex - get a port's duplex
361  * @port: the port we're looking at
362  *
363  * Return @port's duplex in 802.3ad bitmask format. i.e.:
364  *     0x01 if in full duplex
365  *     0x00 otherwise
366  */
367 static u8 __get_duplex(struct port *port)
368 {
369         struct slave *slave = port->slave;
370
371         u8 retval;
372
373         //  handling a special case: when the configuration starts with
374         // link down, it sets the duplex to 0.
375         if (slave->link != BOND_LINK_UP) {
376                 retval=0x0;
377         } else {
378                 switch (slave->duplex) {
379                 case DUPLEX_FULL:
380                         retval=0x1;
381                         pr_debug("Port %d Received status full duplex update from adapter\n", port->actor_port_number);
382                         break;
383                 case DUPLEX_HALF:
384                 default:
385                         retval=0x0;
386                         pr_debug("Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number);
387                         break;
388                 }
389         }
390         return retval;
391 }
392
393 /**
394  * __initialize_port_locks - initialize a port's RX machine spinlock
395  * @port: the port we're looking at
396  *
397  */
398 static inline void __initialize_port_locks(struct port *port)
399 {
400         // make sure it isn't called twice
401         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
402 }
403
404 //conversions
405
406 /**
407  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
408  * @timer_type: which timer to operate
409  * @par: timer parameter. see below
410  *
411  * If @timer_type is %current_while_timer, @par indicates long/short timer.
412  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
413  *                                                  %SLOW_PERIODIC_TIME.
414  */
415 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
416 {
417         u16 retval=0;    //to silence the compiler
418
419         switch (timer_type) {
420         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
421                 if (par) {            // for short or long timeout
422                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
423                 } else {
424                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
425                 }
426                 break;
427         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
428                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
429                 break;
430         case AD_PERIODIC_TIMER:     // for periodic machine
431                 retval = (par*ad_ticks_per_sec); // long timeout
432                 break;
433         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
434                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
435                 break;
436         case AD_WAIT_WHILE_TIMER:           // for selection machine
437                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
438                 break;
439         }
440         return retval;
441 }
442
443
444 /////////////////////////////////////////////////////////////////////////////////
445 // ================= ad_rx_machine helper functions ==================
446 /////////////////////////////////////////////////////////////////////////////////
447
448 /**
449  * __record_pdu - record parameters from a received lacpdu
450  * @lacpdu: the lacpdu we've received
451  * @port: the port we're looking at
452  *
453  * Record the parameter values for the Actor carried in a received lacpdu as
454  * the current partner operational parameter values and sets
455  * actor_oper_port_state.defaulted to FALSE.
456  */
457 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
458 {
459         if (lacpdu && port) {
460                 struct port_params *partner = &port->partner_oper;
461
462                 // record the new parameter values for the partner operational
463                 partner->port_number = ntohs(lacpdu->actor_port);
464                 partner->port_priority = ntohs(lacpdu->actor_port_priority);
465                 partner->system = lacpdu->actor_system;
466                 partner->system_priority = ntohs(lacpdu->actor_system_priority);
467                 partner->key = ntohs(lacpdu->actor_key);
468                 partner->port_state = lacpdu->actor_state;
469
470                 // set actor_oper_port_state.defaulted to FALSE
471                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
472
473                 // set the partner sync. to on if the partner is sync. and the port is matched
474                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
475                         partner->port_state |= AD_STATE_SYNCHRONIZATION;
476                 } else {
477                         partner->port_state &= ~AD_STATE_SYNCHRONIZATION;
478                 }
479         }
480 }
481
482 /**
483  * __record_default - record default parameters
484  * @port: the port we're looking at
485  *
486  * This function records the default parameter values for the partner carried
487  * in the Partner Admin parameters as the current partner operational parameter
488  * values and sets actor_oper_port_state.defaulted to TRUE.
489  */
490 static void __record_default(struct port *port)
491 {
492         if (port) {
493                 // record the partner admin parameters
494                 memcpy(&port->partner_oper, &port->partner_admin,
495                        sizeof(struct port_params));
496
497                 // set actor_oper_port_state.defaulted to true
498                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
499         }
500 }
501
502 /**
503  * __update_selected - update a port's Selected variable from a received lacpdu
504  * @lacpdu: the lacpdu we've received
505  * @port: the port we're looking at
506  *
507  * Update the value of the selected variable, using parameter values from a
508  * newly received lacpdu. The parameter values for the Actor carried in the
509  * received PDU are compared with the corresponding operational parameter
510  * values for the ports partner. If one or more of the comparisons shows that
511  * the value(s) received in the PDU differ from the current operational values,
512  * then selected is set to FALSE and actor_oper_port_state.synchronization is
513  * set to out_of_sync. Otherwise, selected remains unchanged.
514  */
515 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
516 {
517         if (lacpdu && port) {
518                 const struct port_params *partner = &port->partner_oper;
519
520                 // check if any parameter is different
521                 if (ntohs(lacpdu->actor_port) != partner->port_number
522                     || ntohs(lacpdu->actor_port_priority) != partner->port_priority
523                     || MAC_ADDRESS_COMPARE(&lacpdu->actor_system, &partner->system)
524                     || ntohs(lacpdu->actor_system_priority) != partner->system_priority
525                     || ntohs(lacpdu->actor_key) != partner->key
526                     || (lacpdu->actor_state & AD_STATE_AGGREGATION) != (partner->port_state & AD_STATE_AGGREGATION)) {
527                         // update the state machine Selected variable
528                         port->sm_vars &= ~AD_PORT_SELECTED;
529                 }
530         }
531 }
532
533 /**
534  * __update_default_selected - update a port's Selected variable from Partner
535  * @port: the port we're looking at
536  *
537  * This function updates the value of the selected variable, using the partner
538  * administrative parameter values. The administrative values are compared with
539  * the corresponding operational parameter values for the partner. If one or
540  * more of the comparisons shows that the administrative value(s) differ from
541  * the current operational values, then Selected is set to FALSE and
542  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
543  * Selected remains unchanged.
544  */
545 static void __update_default_selected(struct port *port)
546 {
547         if (port) {
548                 const struct port_params *admin = &port->partner_admin;
549                 const struct port_params *oper = &port->partner_oper;
550
551                 // check if any parameter is different
552                 if (admin->port_number != oper->port_number
553                     || admin->port_priority != oper->port_priority
554                     || MAC_ADDRESS_COMPARE(&admin->system, &oper->system)
555                     || admin->system_priority != oper->system_priority
556                     || admin->key != oper->key
557                     || (admin->port_state & AD_STATE_AGGREGATION)
558                         != (oper->port_state & AD_STATE_AGGREGATION)) {
559                         // update the state machine Selected variable
560                         port->sm_vars &= ~AD_PORT_SELECTED;
561                 }
562         }
563 }
564
565 /**
566  * __choose_matched - update a port's matched variable from a received lacpdu
567  * @lacpdu: the lacpdu we've received
568  * @port: the port we're looking at
569  *
570  * Update the value of the matched variable, using parameter values from a
571  * newly received lacpdu. Parameter values for the partner carried in the
572  * received PDU are compared with the corresponding operational parameter
573  * values for the actor. Matched is set to TRUE if all of these parameters
574  * match and the PDU parameter partner_state.aggregation has the same value as
575  * actor_oper_port_state.aggregation and lacp will actively maintain the link
576  * in the aggregation. Matched is also set to TRUE if the value of
577  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
578  * an individual link and lacp will actively maintain the link. Otherwise,
579  * matched is set to FALSE. LACP is considered to be actively maintaining the
580  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
581  * the actor's actor_oper_port_state.lacp_activity and the PDU's
582  * partner_state.lacp_activity variables are TRUE.
583  */
584 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
585 {
586         // validate lacpdu and port
587         if (lacpdu && port) {
588                 // check if all parameters are alike
589                 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
590                      (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
591                      !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
592                      (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
593                      (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
594                      ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
595                     // or this is individual link(aggregation == FALSE)
596                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
597                    ) {
598                         // update the state machine Matched variable
599                         port->sm_vars |= AD_PORT_MATCHED;
600                 } else {
601                         port->sm_vars &= ~AD_PORT_MATCHED;
602                 }
603         }
604 }
605
606 /**
607  * __update_ntt - update a port's ntt variable from a received lacpdu
608  * @lacpdu: the lacpdu we've received
609  * @port: the port we're looking at
610  *
611  * Updates the value of the ntt variable, using parameter values from a newly
612  * received lacpdu. The parameter values for the partner carried in the
613  * received PDU are compared with the corresponding operational parameter
614  * values for the Actor. If one or more of the comparisons shows that the
615  * value(s) received in the PDU differ from the current operational values,
616  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
617  */
618 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
619 {
620         // validate lacpdu and port
621         if (lacpdu && port) {
622                 // check if any parameter is different
623                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
624                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
625                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
626                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
627                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
628                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
629                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
630                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
631                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
632                    ) {
633
634                         port->ntt = true;
635                 }
636         }
637 }
638
639 /**
640  * __attach_bond_to_agg
641  * @port: the port we're looking at
642  *
643  * Handle the attaching of the port's control parser/multiplexer and the
644  * aggregator. This function does nothing since the parser/multiplexer of the
645  * receive and the parser/multiplexer of the aggregator are already combined.
646  */
647 static void __attach_bond_to_agg(struct port *port)
648 {
649         port=NULL; // just to satisfy the compiler
650         // This function does nothing since the parser/multiplexer of the receive
651         // and the parser/multiplexer of the aggregator are already combined
652 }
653
654 /**
655  * __detach_bond_from_agg
656  * @port: the port we're looking at
657  *
658  * Handle the detaching of the port's control parser/multiplexer from the
659  * aggregator. This function does nothing since the parser/multiplexer of the
660  * receive and the parser/multiplexer of the aggregator are already combined.
661  */
662 static void __detach_bond_from_agg(struct port *port)
663 {
664         port=NULL; // just to satisfy the compiler
665         // This function does nothing sience the parser/multiplexer of the receive
666         // and the parser/multiplexer of the aggregator are already combined
667 }
668
669 /**
670  * __agg_ports_are_ready - check if all ports in an aggregator are ready
671  * @aggregator: the aggregator we're looking at
672  *
673  */
674 static int __agg_ports_are_ready(struct aggregator *aggregator)
675 {
676         struct port *port;
677         int retval = 1;
678
679         if (aggregator) {
680                 // scan all ports in this aggregator to verfy if they are all ready
681                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
682                         if (!(port->sm_vars & AD_PORT_READY_N)) {
683                                 retval = 0;
684                                 break;
685                         }
686                 }
687         }
688
689         return retval;
690 }
691
692 /**
693  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
694  * @aggregator: the aggregator we're looking at
695  * @val: Should the ports' ready bit be set on or off
696  *
697  */
698 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
699 {
700         struct port *port;
701
702         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
703                 if (val) {
704                         port->sm_vars |= AD_PORT_READY;
705                 } else {
706                         port->sm_vars &= ~AD_PORT_READY;
707                 }
708         }
709 }
710
711 /**
712  * __get_agg_bandwidth - get the total bandwidth of an aggregator
713  * @aggregator: the aggregator we're looking at
714  *
715  */
716 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
717 {
718         u32 bandwidth=0;
719         u32 basic_speed;
720
721         if (aggregator->num_of_ports) {
722                 basic_speed = __get_link_speed(aggregator->lag_ports);
723                 switch (basic_speed) {
724                 case AD_LINK_SPEED_BITMASK_1MBPS:
725                         bandwidth = aggregator->num_of_ports;
726                         break;
727                 case AD_LINK_SPEED_BITMASK_10MBPS:
728                         bandwidth = aggregator->num_of_ports * 10;
729                         break;
730                 case AD_LINK_SPEED_BITMASK_100MBPS:
731                         bandwidth = aggregator->num_of_ports * 100;
732                         break;
733                 case AD_LINK_SPEED_BITMASK_1000MBPS:
734                         bandwidth = aggregator->num_of_ports * 1000;
735                         break;
736                 case AD_LINK_SPEED_BITMASK_10000MBPS:
737                         bandwidth = aggregator->num_of_ports * 10000;
738                         break;
739                 default:
740                         bandwidth=0; // to silent the compilor ....
741                 }
742         }
743         return bandwidth;
744 }
745
746 /**
747  * __get_active_agg - get the current active aggregator
748  * @aggregator: the aggregator we're looking at
749  *
750  */
751 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
752 {
753         struct aggregator *retval = NULL;
754
755         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
756                 if (aggregator->is_active) {
757                         retval = aggregator;
758                         break;
759                 }
760         }
761
762         return retval;
763 }
764
765 /**
766  * __update_lacpdu_from_port - update a port's lacpdu fields
767  * @port: the port we're looking at
768  *
769  */
770 static inline void __update_lacpdu_from_port(struct port *port)
771 {
772         struct lacpdu *lacpdu = &port->lacpdu;
773         const struct port_params *partner = &port->partner_oper;
774
775         /* update current actual Actor parameters */
776         /* lacpdu->subtype                   initialized
777          * lacpdu->version_number            initialized
778          * lacpdu->tlv_type_actor_info       initialized
779          * lacpdu->actor_information_length  initialized
780          */
781
782         lacpdu->actor_system_priority = htons(port->actor_system_priority);
783         lacpdu->actor_system = port->actor_system;
784         lacpdu->actor_key = htons(port->actor_oper_port_key);
785         lacpdu->actor_port_priority = htons(port->actor_port_priority);
786         lacpdu->actor_port = htons(port->actor_port_number);
787         lacpdu->actor_state = port->actor_oper_port_state;
788
789         /* lacpdu->reserved_3_1              initialized
790          * lacpdu->tlv_type_partner_info     initialized
791          * lacpdu->partner_information_length initialized
792          */
793
794         lacpdu->partner_system_priority = htons(partner->system_priority);
795         lacpdu->partner_system = partner->system;
796         lacpdu->partner_key = htons(partner->key);
797         lacpdu->partner_port_priority = htons(partner->port_priority);
798         lacpdu->partner_port = htons(partner->port_number);
799         lacpdu->partner_state = partner->port_state;
800
801         /* lacpdu->reserved_3_2              initialized
802          * lacpdu->tlv_type_collector_info   initialized
803          * lacpdu->collector_information_length initialized
804          * collector_max_delay                initialized
805          * reserved_12[12]                   initialized
806          * tlv_type_terminator               initialized
807          * terminator_length                 initialized
808          * reserved_50[50]                   initialized
809          */
810 }
811
812 //////////////////////////////////////////////////////////////////////////////////////
813 // ================= main 802.3ad protocol code ======================================
814 //////////////////////////////////////////////////////////////////////////////////////
815
816 /**
817  * ad_lacpdu_send - send out a lacpdu packet on a given port
818  * @port: the port we're looking at
819  *
820  * Returns:   0 on success
821  *          < 0 on error
822  */
823 static int ad_lacpdu_send(struct port *port)
824 {
825         struct slave *slave = port->slave;
826         struct sk_buff *skb;
827         struct lacpdu_header *lacpdu_header;
828         int length = sizeof(struct lacpdu_header);
829
830         skb = dev_alloc_skb(length);
831         if (!skb) {
832                 return -ENOMEM;
833         }
834
835         skb->dev = slave->dev;
836         skb_reset_mac_header(skb);
837         skb->network_header = skb->mac_header + ETH_HLEN;
838         skb->protocol = PKT_TYPE_LACPDU;
839         skb->priority = TC_PRIO_CONTROL;
840
841         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
842
843         memcpy(lacpdu_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
844         /* Note: source addres is set to be the member's PERMANENT address,
845            because we use it to identify loopback lacpdus in receive. */
846         memcpy(lacpdu_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
847         lacpdu_header->hdr.h_proto = PKT_TYPE_LACPDU;
848
849         lacpdu_header->lacpdu = port->lacpdu; // struct copy
850
851         dev_queue_xmit(skb);
852
853         return 0;
854 }
855
856 /**
857  * ad_marker_send - send marker information/response on a given port
858  * @port: the port we're looking at
859  * @marker: marker data to send
860  *
861  * Returns:   0 on success
862  *          < 0 on error
863  */
864 static int ad_marker_send(struct port *port, struct bond_marker *marker)
865 {
866         struct slave *slave = port->slave;
867         struct sk_buff *skb;
868         struct bond_marker_header *marker_header;
869         int length = sizeof(struct bond_marker_header);
870
871         skb = dev_alloc_skb(length + 16);
872         if (!skb) {
873                 return -ENOMEM;
874         }
875
876         skb_reserve(skb, 16);
877
878         skb->dev = slave->dev;
879         skb_reset_mac_header(skb);
880         skb->network_header = skb->mac_header + ETH_HLEN;
881         skb->protocol = PKT_TYPE_LACPDU;
882
883         marker_header = (struct bond_marker_header *)skb_put(skb, length);
884
885         memcpy(marker_header->hdr.h_dest, lacpdu_mcast_addr, ETH_ALEN);
886         /* Note: source addres is set to be the member's PERMANENT address,
887            because we use it to identify loopback MARKERs in receive. */
888         memcpy(marker_header->hdr.h_source, slave->perm_hwaddr, ETH_ALEN);
889         marker_header->hdr.h_proto = PKT_TYPE_LACPDU;
890
891         marker_header->marker = *marker; // struct copy
892
893         dev_queue_xmit(skb);
894
895         return 0;
896 }
897
898 /**
899  * ad_mux_machine - handle a port's mux state machine
900  * @port: the port we're looking at
901  *
902  */
903 static void ad_mux_machine(struct port *port)
904 {
905         mux_states_t last_state;
906
907         // keep current State Machine state to compare later if it was changed
908         last_state = port->sm_mux_state;
909
910         if (port->sm_vars & AD_PORT_BEGIN) {
911                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
912         } else {
913                 switch (port->sm_mux_state) {
914                 case AD_MUX_DETACHED:
915                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
916                                 port->sm_mux_state = AD_MUX_WAITING; // next state
917                         }
918                         break;
919                 case AD_MUX_WAITING:
920                         // if SELECTED == FALSE return to DETACH state
921                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
922                                 port->sm_vars &= ~AD_PORT_READY_N;
923                                 // in order to withhold the Selection Logic to check all ports READY_N value
924                                 // every callback cycle to update ready variable, we check READY_N and update READY here
925                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
926                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
927                                 break;
928                         }
929
930                         // check if the wait_while_timer expired
931                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
932                                 port->sm_vars |= AD_PORT_READY_N;
933                         }
934
935                         // in order to withhold the selection logic to check all ports READY_N value
936                         // every callback cycle to update ready variable, we check READY_N and update READY here
937                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
938
939                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
940                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
941                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
942                         }
943                         break;
944                 case AD_MUX_ATTACHED:
945                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
946                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
947                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
948                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
949                                 port->sm_vars &= ~AD_PORT_READY_N;
950                                 // in order to withhold the selection logic to check all ports READY_N value
951                                 // every callback cycle to update ready variable, we check READY_N and update READY here
952                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
953                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
954                         }
955                         break;
956                 case AD_MUX_COLLECTING_DISTRIBUTING:
957                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
958                             !(port->partner_oper.port_state & AD_STATE_SYNCHRONIZATION)
959                            ) {
960                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
961
962                         } else {
963                                 // if port state hasn't changed make
964                                 // sure that a collecting distributing
965                                 // port in an active aggregator is enabled
966                                 if (port->aggregator &&
967                                     port->aggregator->is_active &&
968                                     !__port_is_enabled(port)) {
969
970                                         __enable_port(port);
971                                 }
972                         }
973                         break;
974                 default:    //to silence the compiler
975                         break;
976                 }
977         }
978
979         // check if the state machine was changed
980         if (port->sm_mux_state != last_state) {
981                 pr_debug("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
982                 switch (port->sm_mux_state) {
983                 case AD_MUX_DETACHED:
984                         __detach_bond_from_agg(port);
985                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
986                         ad_disable_collecting_distributing(port);
987                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
988                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
989                         port->ntt = true;
990                         break;
991                 case AD_MUX_WAITING:
992                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
993                         break;
994                 case AD_MUX_ATTACHED:
995                         __attach_bond_to_agg(port);
996                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
997                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
998                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
999                         ad_disable_collecting_distributing(port);
1000                         port->ntt = true;
1001                         break;
1002                 case AD_MUX_COLLECTING_DISTRIBUTING:
1003                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1004                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1005                         ad_enable_collecting_distributing(port);
1006                         port->ntt = true;
1007                         break;
1008                 default:    //to silence the compiler
1009                         break;
1010                 }
1011         }
1012 }
1013
1014 /**
1015  * ad_rx_machine - handle a port's rx State Machine
1016  * @lacpdu: the lacpdu we've received
1017  * @port: the port we're looking at
1018  *
1019  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1020  * CURRENT. If timer expired set the state machine in the proper state.
1021  * In other cases, this function checks if we need to switch to other state.
1022  */
1023 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1024 {
1025         rx_states_t last_state;
1026
1027         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1028         __get_rx_machine_lock(port);
1029
1030         // keep current State Machine state to compare later if it was changed
1031         last_state = port->sm_rx_state;
1032
1033         // check if state machine should change state
1034         // first, check if port was reinitialized
1035         if (port->sm_vars & AD_PORT_BEGIN) {
1036                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1037         }
1038         // check if port is not enabled
1039         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1040                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1041         }
1042         // check if new lacpdu arrived
1043         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1044                 port->sm_rx_timer_counter = 0; // zero timer
1045                 port->sm_rx_state = AD_RX_CURRENT;
1046         } else {
1047                 // if timer is on, and if it is expired
1048                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1049                         switch (port->sm_rx_state) {
1050                         case AD_RX_EXPIRED:
1051                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1052                                 break;
1053                         case AD_RX_CURRENT:
1054                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1055                                 break;
1056                         default:    //to silence the compiler
1057                                 break;
1058                         }
1059                 } else {
1060                         // if no lacpdu arrived and no timer is on
1061                         switch (port->sm_rx_state) {
1062                         case AD_RX_PORT_DISABLED:
1063                                 if (port->sm_vars & AD_PORT_MOVED) {
1064                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1065                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1066                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1067                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1068                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1069                                 }
1070                                 break;
1071                         default:    //to silence the compiler
1072                                 break;
1073
1074                         }
1075                 }
1076         }
1077
1078         // check if the State machine was changed or new lacpdu arrived
1079         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1080                 pr_debug("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_rx_state);
1081                 switch (port->sm_rx_state) {
1082                 case AD_RX_INITIALIZE:
1083                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1084                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1085                         } else {
1086                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1087                         }
1088                         port->sm_vars &= ~AD_PORT_SELECTED;
1089                         __record_default(port);
1090                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1091                         port->sm_vars &= ~AD_PORT_MOVED;
1092                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1093
1094                         /*- Fall Through -*/
1095
1096                 case AD_RX_PORT_DISABLED:
1097                         port->sm_vars &= ~AD_PORT_MATCHED;
1098                         break;
1099                 case AD_RX_LACP_DISABLED:
1100                         port->sm_vars &= ~AD_PORT_SELECTED;
1101                         __record_default(port);
1102                         port->partner_oper.port_state &= ~AD_STATE_AGGREGATION;
1103                         port->sm_vars |= AD_PORT_MATCHED;
1104                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1105                         break;
1106                 case AD_RX_EXPIRED:
1107                         //Reset of the Synchronization flag. (Standard 43.4.12)
1108                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1109                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1110                         port->partner_oper.port_state &= ~AD_STATE_SYNCHRONIZATION;
1111                         port->sm_vars &= ~AD_PORT_MATCHED;
1112                         port->partner_oper.port_state |= AD_SHORT_TIMEOUT;
1113                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1114                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1115                         break;
1116                 case AD_RX_DEFAULTED:
1117                         __update_default_selected(port);
1118                         __record_default(port);
1119                         port->sm_vars |= AD_PORT_MATCHED;
1120                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1121                         break;
1122                 case AD_RX_CURRENT:
1123                         // detect loopback situation
1124                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1125                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1126                                 printk(KERN_ERR DRV_NAME ": %s: An illegal loopback occurred on "
1127                                        "adapter (%s). Check the configuration to verify that all "
1128                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1129                                        port->slave->dev->master->name, port->slave->dev->name);
1130                                 __release_rx_machine_lock(port);
1131                                 return;
1132                         }
1133                         __update_selected(lacpdu, port);
1134                         __update_ntt(lacpdu, port);
1135                         __record_pdu(lacpdu, port);
1136                         __choose_matched(lacpdu, port);
1137                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1138                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1139                         // verify that if the aggregator is enabled, the port is enabled too.
1140                         //(because if the link goes down for a short time, the 802.3ad will not
1141                         // catch it, and the port will continue to be disabled)
1142                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1143                                 __enable_port(port);
1144                         }
1145                         break;
1146                 default:    //to silence the compiler
1147                         break;
1148                 }
1149         }
1150         __release_rx_machine_lock(port);
1151 }
1152
1153 /**
1154  * ad_tx_machine - handle a port's tx state machine
1155  * @port: the port we're looking at
1156  *
1157  */
1158 static void ad_tx_machine(struct port *port)
1159 {
1160         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1161         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1162                 // check if there is something to send
1163                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1164                         __update_lacpdu_from_port(port);
1165
1166                         if (ad_lacpdu_send(port) >= 0) {
1167                                 pr_debug("Sent LACPDU on port %d\n", port->actor_port_number);
1168
1169                                 /* mark ntt as false, so it will not be sent again until
1170                                    demanded */
1171                                 port->ntt = false;
1172                         }
1173                 }
1174                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1175                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1176         }
1177 }
1178
1179 /**
1180  * ad_periodic_machine - handle a port's periodic state machine
1181  * @port: the port we're looking at
1182  *
1183  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1184  */
1185 static void ad_periodic_machine(struct port *port)
1186 {
1187         periodic_states_t last_state;
1188
1189         // keep current state machine state to compare later if it was changed
1190         last_state = port->sm_periodic_state;
1191
1192         // check if port was reinitialized
1193         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1194             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper.port_state & AD_STATE_LACP_ACTIVITY))
1195            ) {
1196                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1197         }
1198         // check if state machine should change state
1199         else if (port->sm_periodic_timer_counter) {
1200                 // check if periodic state machine expired
1201                 if (!(--port->sm_periodic_timer_counter)) {
1202                         // if expired then do tx
1203                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1204                 } else {
1205                         // If not expired, check if there is some new timeout parameter from the partner state
1206                         switch (port->sm_periodic_state) {
1207                         case AD_FAST_PERIODIC:
1208                                 if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1209                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1210                                 }
1211                                 break;
1212                         case AD_SLOW_PERIODIC:
1213                                 if ((port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1214                                         // stop current timer
1215                                         port->sm_periodic_timer_counter = 0;
1216                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1217                                 }
1218                                 break;
1219                         default:    //to silence the compiler
1220                                 break;
1221                         }
1222                 }
1223         } else {
1224                 switch (port->sm_periodic_state) {
1225                 case AD_NO_PERIODIC:
1226                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1227                         break;
1228                 case AD_PERIODIC_TX:
1229                         if (!(port->partner_oper.port_state & AD_STATE_LACP_TIMEOUT)) {
1230                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1231                         } else {
1232                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1233                         }
1234                         break;
1235                 default:    //to silence the compiler
1236                         break;
1237                 }
1238         }
1239
1240         // check if the state machine was changed
1241         if (port->sm_periodic_state != last_state) {
1242                 pr_debug("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1243                 switch (port->sm_periodic_state) {
1244                 case AD_NO_PERIODIC:
1245                         port->sm_periodic_timer_counter = 0;       // zero timer
1246                         break;
1247                 case AD_FAST_PERIODIC:
1248                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_FAST_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1249                         break;
1250                 case AD_SLOW_PERIODIC:
1251                         port->sm_periodic_timer_counter = __ad_timer_to_ticks(AD_PERIODIC_TIMER, (u16)(AD_SLOW_PERIODIC_TIME))-1; // decrement 1 tick we lost in the PERIODIC_TX cycle
1252                         break;
1253                 case AD_PERIODIC_TX:
1254                         port->ntt = true;
1255                         break;
1256                 default:    //to silence the compiler
1257                         break;
1258                 }
1259         }
1260 }
1261
1262 /**
1263  * ad_port_selection_logic - select aggregation groups
1264  * @port: the port we're looking at
1265  *
1266  * Select aggregation groups, and assign each port for it's aggregetor. The
1267  * selection logic is called in the inititalization (after all the handshkes),
1268  * and after every lacpdu receive (if selected is off).
1269  */
1270 static void ad_port_selection_logic(struct port *port)
1271 {
1272         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1273         struct port *last_port = NULL, *curr_port;
1274         int found = 0;
1275
1276         // if the port is already Selected, do nothing
1277         if (port->sm_vars & AD_PORT_SELECTED) {
1278                 return;
1279         }
1280
1281         // if the port is connected to other aggregator, detach it
1282         if (port->aggregator) {
1283                 // detach the port from its former aggregator
1284                 temp_aggregator=port->aggregator;
1285                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1286                         if (curr_port == port) {
1287                                 temp_aggregator->num_of_ports--;
1288                                 if (!last_port) {// if it is the first port attached to the aggregator
1289                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1290                                 } else {// not the first port attached to the aggregator
1291                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1292                                 }
1293
1294                                 // clear the port's relations to this aggregator
1295                                 port->aggregator = NULL;
1296                                 port->next_port_in_aggregator=NULL;
1297                                 port->actor_port_aggregator_identifier=0;
1298
1299                                 pr_debug("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1300                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1301                                 if (!temp_aggregator->lag_ports) {
1302                                         ad_clear_agg(temp_aggregator);
1303                                 }
1304                                 break;
1305                         }
1306                 }
1307                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1308                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Port %d (on %s) was "
1309                                "related to aggregator %d but was not on its port list\n",
1310                                port->slave->dev->master->name,
1311                                port->actor_port_number, port->slave->dev->name,
1312                                port->aggregator->aggregator_identifier);
1313                 }
1314         }
1315         // search on all aggregators for a suitable aggregator for this port
1316         for (aggregator = __get_first_agg(port); aggregator;
1317              aggregator = __get_next_agg(aggregator)) {
1318
1319                 // keep a free aggregator for later use(if needed)
1320                 if (!aggregator->lag_ports) {
1321                         if (!free_aggregator) {
1322                                 free_aggregator=aggregator;
1323                         }
1324                         continue;
1325                 }
1326                 // check if current aggregator suits us
1327                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1328                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper.system)) &&
1329                      (aggregator->partner_system_priority == port->partner_oper.system_priority) &&
1330                      (aggregator->partner_oper_aggregator_key == port->partner_oper.key)
1331                     ) &&
1332                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper.system), &(null_mac_addr)) && // partner answers
1333                       !aggregator->is_individual)  // but is not individual OR
1334                     )
1335                    ) {
1336                         // attach to the founded aggregator
1337                         port->aggregator = aggregator;
1338                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1339                         port->next_port_in_aggregator=aggregator->lag_ports;
1340                         port->aggregator->num_of_ports++;
1341                         aggregator->lag_ports=port;
1342                         pr_debug("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1343
1344                         // mark this port as selected
1345                         port->sm_vars |= AD_PORT_SELECTED;
1346                         found = 1;
1347                         break;
1348                 }
1349         }
1350
1351         // the port couldn't find an aggregator - attach it to a new aggregator
1352         if (!found) {
1353                 if (free_aggregator) {
1354                         // assign port a new aggregator
1355                         port->aggregator = free_aggregator;
1356                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1357
1358                         // update the new aggregator's parameters
1359                         // if port was responsed from the end-user
1360                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1361                                 port->aggregator->is_individual = false;
1362                         } else {
1363                                 port->aggregator->is_individual = true;
1364                         }
1365
1366                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1367                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1368                         port->aggregator->partner_system=port->partner_oper.system;
1369                         port->aggregator->partner_system_priority = port->partner_oper.system_priority;
1370                         port->aggregator->partner_oper_aggregator_key = port->partner_oper.key;
1371                         port->aggregator->receive_state = 1;
1372                         port->aggregator->transmit_state = 1;
1373                         port->aggregator->lag_ports = port;
1374                         port->aggregator->num_of_ports++;
1375
1376                         // mark this port as selected
1377                         port->sm_vars |= AD_PORT_SELECTED;
1378
1379                         pr_debug("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1380                 } else {
1381                         printk(KERN_ERR DRV_NAME ": %s: Port %d (on %s) did not find a suitable aggregator\n",
1382                                port->slave->dev->master->name,
1383                                port->actor_port_number, port->slave->dev->name);
1384                 }
1385         }
1386         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1387         // else set ready=FALSE in all aggregator's ports
1388         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1389
1390         aggregator = __get_first_agg(port);
1391         ad_agg_selection_logic(aggregator);
1392 }
1393
1394 /*
1395  * Decide if "agg" is a better choice for the new active aggregator that
1396  * the current best, according to the ad_select policy.
1397  */
1398 static struct aggregator *ad_agg_selection_test(struct aggregator *best,
1399                                                 struct aggregator *curr)
1400 {
1401         /*
1402          * 0. If no best, select current.
1403          *
1404          * 1. If the current agg is not individual, and the best is
1405          *    individual, select current.
1406          *
1407          * 2. If current agg is individual and the best is not, keep best.
1408          *
1409          * 3. Therefore, current and best are both individual or both not
1410          *    individual, so:
1411          *
1412          * 3a. If current agg partner replied, and best agg partner did not,
1413          *     select current.
1414          *
1415          * 3b. If current agg partner did not reply and best agg partner
1416          *     did reply, keep best.
1417          *
1418          * 4.  Therefore, current and best both have partner replies or
1419          *     both do not, so perform selection policy:
1420          *
1421          * BOND_AD_COUNT: Select by count of ports.  If count is equal,
1422          *     select by bandwidth.
1423          *
1424          * BOND_AD_STABLE, BOND_AD_BANDWIDTH: Select by bandwidth.
1425          */
1426         if (!best)
1427                 return curr;
1428
1429         if (!curr->is_individual && best->is_individual)
1430                 return curr;
1431
1432         if (curr->is_individual && !best->is_individual)
1433                 return best;
1434
1435         if (__agg_has_partner(curr) && !__agg_has_partner(best))
1436                 return curr;
1437
1438         if (!__agg_has_partner(curr) && __agg_has_partner(best))
1439                 return best;
1440
1441         switch (__get_agg_selection_mode(curr->lag_ports)) {
1442         case BOND_AD_COUNT:
1443                 if (curr->num_of_ports > best->num_of_ports)
1444                         return curr;
1445
1446                 if (curr->num_of_ports < best->num_of_ports)
1447                         return best;
1448
1449                 /*FALLTHROUGH*/
1450         case BOND_AD_STABLE:
1451         case BOND_AD_BANDWIDTH:
1452                 if (__get_agg_bandwidth(curr) > __get_agg_bandwidth(best))
1453                         return curr;
1454
1455                 break;
1456
1457         default:
1458                 printk(KERN_WARNING DRV_NAME
1459                        ": %s: Impossible agg select mode %d\n",
1460                        curr->slave->dev->master->name,
1461                        __get_agg_selection_mode(curr->lag_ports));
1462                 break;
1463         }
1464
1465         return best;
1466 }
1467
1468 /**
1469  * ad_agg_selection_logic - select an aggregation group for a team
1470  * @aggregator: the aggregator we're looking at
1471  *
1472  * It is assumed that only one aggregator may be selected for a team.
1473  *
1474  * The logic of this function is to select the aggregator according to
1475  * the ad_select policy:
1476  *
1477  * BOND_AD_STABLE: select the aggregator with the most ports attached to
1478  * it, and to reselect the active aggregator only if the previous
1479  * aggregator has no more ports related to it.
1480  *
1481  * BOND_AD_BANDWIDTH: select the aggregator with the highest total
1482  * bandwidth, and reselect whenever a link state change takes place or the
1483  * set of slaves in the bond changes.
1484  *
1485  * BOND_AD_COUNT: select the aggregator with largest number of ports
1486  * (slaves), and reselect whenever a link state change takes place or the
1487  * set of slaves in the bond changes.
1488  *
1489  * FIXME: this function MUST be called with the first agg in the bond, or
1490  * __get_active_agg() won't work correctly. This function should be better
1491  * called with the bond itself, and retrieve the first agg from it.
1492  */
1493 static void ad_agg_selection_logic(struct aggregator *agg)
1494 {
1495         struct aggregator *best, *active, *origin;
1496         struct port *port;
1497
1498         origin = agg;
1499
1500         active = __get_active_agg(agg);
1501         best = active;
1502
1503         do {
1504                 agg->is_active = 0;
1505
1506                 if (agg->num_of_ports)
1507                         best = ad_agg_selection_test(best, agg);
1508
1509         } while ((agg = __get_next_agg(agg)));
1510
1511         if (best &&
1512             __get_agg_selection_mode(best->lag_ports) == BOND_AD_STABLE) {
1513                 /*
1514                  * For the STABLE policy, don't replace the old active
1515                  * aggregator if it's still active (it has an answering
1516                  * partner) or if both the best and active don't have an
1517                  * answering partner.
1518                  */
1519                 if (active && active->lag_ports &&
1520                     active->lag_ports->is_enabled &&
1521                     (__agg_has_partner(active) ||
1522                      (!__agg_has_partner(active) && !__agg_has_partner(best)))) {
1523                         if (!(!active->actor_oper_aggregator_key &&
1524                               best->actor_oper_aggregator_key)) {
1525                                 best = NULL;
1526                                 active->is_active = 1;
1527                         }
1528                 }
1529         }
1530
1531         if (best && (best == active)) {
1532                 best = NULL;
1533                 active->is_active = 1;
1534         }
1535
1536         // if there is new best aggregator, activate it
1537         if (best) {
1538                 pr_debug("best Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1539                        best->aggregator_identifier, best->num_of_ports,
1540                        best->actor_oper_aggregator_key,
1541                        best->partner_oper_aggregator_key,
1542                        best->is_individual, best->is_active);
1543                 pr_debug("best ports %p slave %p %s\n",
1544                        best->lag_ports, best->slave,
1545                        best->slave ? best->slave->dev->name : "NULL");
1546
1547                 for (agg = __get_first_agg(best->lag_ports); agg;
1548                      agg = __get_next_agg(agg)) {
1549
1550                         pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1551                                 agg->aggregator_identifier, agg->num_of_ports,
1552                                 agg->actor_oper_aggregator_key,
1553                                 agg->partner_oper_aggregator_key,
1554                                 agg->is_individual, agg->is_active);
1555                 }
1556
1557                 // check if any partner replys
1558                 if (best->is_individual) {
1559                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad"
1560                                " response from the link partner for any"
1561                                " adapters in the bond\n",
1562                                best->slave->dev->master->name);
1563                 }
1564
1565                 best->is_active = 1;
1566                 pr_debug("LAG %d chosen as the active LAG\n",
1567                         best->aggregator_identifier);
1568                 pr_debug("Agg=%d; P=%d; a k=%d; p k=%d; Ind=%d; Act=%d\n",
1569                         best->aggregator_identifier, best->num_of_ports,
1570                         best->actor_oper_aggregator_key,
1571                         best->partner_oper_aggregator_key,
1572                         best->is_individual, best->is_active);
1573
1574                 // disable the ports that were related to the former active_aggregator
1575                 if (active) {
1576                         for (port = active->lag_ports; port;
1577                              port = port->next_port_in_aggregator) {
1578                                 __disable_port(port);
1579                         }
1580                 }
1581         }
1582
1583         /*
1584          * if the selected aggregator is of join individuals
1585          * (partner_system is NULL), enable their ports
1586          */
1587         active = __get_active_agg(origin);
1588
1589         if (active) {
1590                 if (!__agg_has_partner(active)) {
1591                         for (port = active->lag_ports; port;
1592                              port = port->next_port_in_aggregator) {
1593                                 __enable_port(port);
1594                         }
1595                 }
1596         }
1597
1598         if (origin->slave) {
1599                 struct bonding *bond;
1600
1601                 bond = bond_get_bond_by_slave(origin->slave);
1602                 if (bond)
1603                         bond_3ad_set_carrier(bond);
1604         }
1605 }
1606
1607 /**
1608  * ad_clear_agg - clear a given aggregator's parameters
1609  * @aggregator: the aggregator we're looking at
1610  *
1611  */
1612 static void ad_clear_agg(struct aggregator *aggregator)
1613 {
1614         if (aggregator) {
1615                 aggregator->is_individual = false;
1616                 aggregator->actor_admin_aggregator_key = 0;
1617                 aggregator->actor_oper_aggregator_key = 0;
1618                 aggregator->partner_system = null_mac_addr;
1619                 aggregator->partner_system_priority = 0;
1620                 aggregator->partner_oper_aggregator_key = 0;
1621                 aggregator->receive_state = 0;
1622                 aggregator->transmit_state = 0;
1623                 aggregator->lag_ports = NULL;
1624                 aggregator->is_active = 0;
1625                 aggregator->num_of_ports = 0;
1626                 pr_debug("LAG %d was cleared\n", aggregator->aggregator_identifier);
1627         }
1628 }
1629
1630 /**
1631  * ad_initialize_agg - initialize a given aggregator's parameters
1632  * @aggregator: the aggregator we're looking at
1633  *
1634  */
1635 static void ad_initialize_agg(struct aggregator *aggregator)
1636 {
1637         if (aggregator) {
1638                 ad_clear_agg(aggregator);
1639
1640                 aggregator->aggregator_mac_address = null_mac_addr;
1641                 aggregator->aggregator_identifier = 0;
1642                 aggregator->slave = NULL;
1643         }
1644 }
1645
1646 /**
1647  * ad_initialize_port - initialize a given port's parameters
1648  * @aggregator: the aggregator we're looking at
1649  * @lacp_fast: boolean. whether fast periodic should be used
1650  *
1651  */
1652 static void ad_initialize_port(struct port *port, int lacp_fast)
1653 {
1654         static const struct port_params tmpl = {
1655                 .system_priority = 0xffff,
1656                 .key             = 1,
1657                 .port_number     = 1,
1658                 .port_priority   = 0xff,
1659                 .port_state      = 1,
1660         };
1661         static const struct lacpdu lacpdu = {
1662                 .subtype                = 0x01,
1663                 .version_number = 0x01,
1664                 .tlv_type_actor_info = 0x01,
1665                 .actor_information_length = 0x14,
1666                 .tlv_type_partner_info = 0x02,
1667                 .partner_information_length = 0x14,
1668                 .tlv_type_collector_info = 0x03,
1669                 .collector_information_length = 0x10,
1670                 .collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY),
1671         };
1672
1673         if (port) {
1674                 port->actor_port_number = 1;
1675                 port->actor_port_priority = 0xff;
1676                 port->actor_system = null_mac_addr;
1677                 port->actor_system_priority = 0xffff;
1678                 port->actor_port_aggregator_identifier = 0;
1679                 port->ntt = false;
1680                 port->actor_admin_port_key = 1;
1681                 port->actor_oper_port_key  = 1;
1682                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1683                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1684
1685                 if (lacp_fast) {
1686                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1687                 }
1688
1689                 memcpy(&port->partner_admin, &tmpl, sizeof(tmpl));
1690                 memcpy(&port->partner_oper, &tmpl, sizeof(tmpl));
1691
1692                 port->is_enabled = true;
1693                 // ****** private parameters ******
1694                 port->sm_vars = 0x3;
1695                 port->sm_rx_state = 0;
1696                 port->sm_rx_timer_counter = 0;
1697                 port->sm_periodic_state = 0;
1698                 port->sm_periodic_timer_counter = 0;
1699                 port->sm_mux_state = 0;
1700                 port->sm_mux_timer_counter = 0;
1701                 port->sm_tx_state = 0;
1702                 port->sm_tx_timer_counter = 0;
1703                 port->slave = NULL;
1704                 port->aggregator = NULL;
1705                 port->next_port_in_aggregator = NULL;
1706                 port->transaction_id = 0;
1707
1708                 memcpy(&port->lacpdu, &lacpdu, sizeof(lacpdu));
1709         }
1710 }
1711
1712 /**
1713  * ad_enable_collecting_distributing - enable a port's transmit/receive
1714  * @port: the port we're looking at
1715  *
1716  * Enable @port if it's in an active aggregator
1717  */
1718 static void ad_enable_collecting_distributing(struct port *port)
1719 {
1720         if (port->aggregator->is_active) {
1721                 pr_debug("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1722                 __enable_port(port);
1723         }
1724 }
1725
1726 /**
1727  * ad_disable_collecting_distributing - disable a port's transmit/receive
1728  * @port: the port we're looking at
1729  *
1730  */
1731 static void ad_disable_collecting_distributing(struct port *port)
1732 {
1733         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1734                 pr_debug("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1735                 __disable_port(port);
1736         }
1737 }
1738
1739 #if 0
1740 /**
1741  * ad_marker_info_send - send a marker information frame
1742  * @port: the port we're looking at
1743  *
1744  * This function does nothing since we decided not to implement send and handle
1745  * response for marker PDU's, in this stage, but only to respond to marker
1746  * information.
1747  */
1748 static void ad_marker_info_send(struct port *port)
1749 {
1750         struct bond_marker marker;
1751         u16 index;
1752
1753         // fill the marker PDU with the appropriate values
1754         marker.subtype = 0x02;
1755         marker.version_number = 0x01;
1756         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1757         marker.marker_length = 0x16;
1758         // convert requester_port to Big Endian
1759         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1760         marker.requester_system = port->actor_system;
1761         // convert requester_port(u32) to Big Endian
1762         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1763         marker.pad = 0;
1764         marker.tlv_type_terminator = 0x00;
1765         marker.terminator_length = 0x00;
1766         for (index=0; index<90; index++) {
1767                 marker.reserved_90[index]=0;
1768         }
1769
1770         // send the marker information
1771         if (ad_marker_send(port, &marker) >= 0) {
1772                 pr_debug("Sent Marker Information on port %d\n", port->actor_port_number);
1773         }
1774 }
1775 #endif
1776
1777 /**
1778  * ad_marker_info_received - handle receive of a Marker information frame
1779  * @marker_info: Marker info received
1780  * @port: the port we're looking at
1781  *
1782  */
1783 static void ad_marker_info_received(struct bond_marker *marker_info,
1784         struct port *port)
1785 {
1786         struct bond_marker marker;
1787
1788         // copy the received marker data to the response marker
1789         //marker = *marker_info;
1790         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1791         // change the marker subtype to marker response
1792         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1793         // send the marker response
1794
1795         if (ad_marker_send(port, &marker) >= 0) {
1796                 pr_debug("Sent Marker Response on port %d\n", port->actor_port_number);
1797         }
1798 }
1799
1800 /**
1801  * ad_marker_response_received - handle receive of a marker response frame
1802  * @marker: marker PDU received
1803  * @port: the port we're looking at
1804  *
1805  * This function does nothing since we decided not to implement send and handle
1806  * response for marker PDU's, in this stage, but only to respond to marker
1807  * information.
1808  */
1809 static void ad_marker_response_received(struct bond_marker *marker,
1810         struct port *port)
1811 {
1812         marker=NULL; // just to satisfy the compiler
1813         port=NULL;  // just to satisfy the compiler
1814         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1815 }
1816
1817 //////////////////////////////////////////////////////////////////////////////////////
1818 // ================= AD exported functions to the main bonding code ==================
1819 //////////////////////////////////////////////////////////////////////////////////////
1820
1821 // Check aggregators status in team every T seconds
1822 #define AD_AGGREGATOR_SELECTION_TIMER  8
1823
1824 /*
1825  * bond_3ad_initiate_agg_selection(struct bonding *bond)
1826  *
1827  * Set the aggregation selection timer, to initiate an agg selection in
1828  * the very near future.  Called during first initialization, and during
1829  * any down to up transitions of the bond.
1830  */
1831 void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout)
1832 {
1833         BOND_AD_INFO(bond).agg_select_timer = timeout;
1834         BOND_AD_INFO(bond).agg_select_mode = bond->params.ad_select;
1835 }
1836
1837 static u16 aggregator_identifier;
1838
1839 /**
1840  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1841  * @bond: bonding struct to work on
1842  * @tick_resolution: tick duration (millisecond resolution)
1843  * @lacp_fast: boolean. whether fast periodic should be used
1844  *
1845  * Can be called only after the mac address of the bond is set.
1846  */
1847 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1848 {
1849         // check that the bond is not initialized yet
1850         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr),
1851                                 bond->dev->dev_addr)) {
1852
1853                 aggregator_identifier = 0;
1854
1855                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1856                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1857                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1858
1859                 // initialize how many times this module is called in one second(should be about every 100ms)
1860                 ad_ticks_per_sec = tick_resolution;
1861
1862                 bond_3ad_initiate_agg_selection(bond,
1863                                                 AD_AGGREGATOR_SELECTION_TIMER *
1864                                                 ad_ticks_per_sec);
1865         }
1866 }
1867
1868 /**
1869  * bond_3ad_bind_slave - initialize a slave's port
1870  * @slave: slave struct to work on
1871  *
1872  * Returns:   0 on success
1873  *          < 0 on error
1874  */
1875 int bond_3ad_bind_slave(struct slave *slave)
1876 {
1877         struct bonding *bond = bond_get_bond_by_slave(slave);
1878         struct port *port;
1879         struct aggregator *aggregator;
1880
1881         if (bond == NULL) {
1882                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1883                        slave->dev->master->name, slave->dev->name);
1884                 return -1;
1885         }
1886
1887         //check that the slave has not been intialized yet.
1888         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1889
1890                 // port initialization
1891                 port = &(SLAVE_AD_INFO(slave).port);
1892
1893                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1894
1895                 port->slave = slave;
1896                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1897                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1898                 //              ------------------------------------------------------------
1899                 // Port key :   | User key                       |      Speed       |Duplex|
1900                 //              ------------------------------------------------------------
1901                 //              16                               6               1 0
1902                 port->actor_admin_port_key = 0; // initialize this parameter
1903                 port->actor_admin_port_key |= __get_duplex(port);
1904                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1905                 port->actor_oper_port_key = port->actor_admin_port_key;
1906                 // if the port is not full duplex, then the port should be not lacp Enabled
1907                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1908                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1909                 }
1910                 // actor system is the bond's system
1911                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1912                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1913                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1914                 port->aggregator = NULL;
1915                 port->next_port_in_aggregator = NULL;
1916
1917                 __disable_port(port);
1918                 __initialize_port_locks(port);
1919
1920
1921                 // aggregator initialization
1922                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1923
1924                 ad_initialize_agg(aggregator);
1925
1926                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1927                 aggregator->aggregator_identifier = (++aggregator_identifier);
1928                 aggregator->slave = slave;
1929                 aggregator->is_active = 0;
1930                 aggregator->num_of_ports = 0;
1931         }
1932
1933         return 0;
1934 }
1935
1936 /**
1937  * bond_3ad_unbind_slave - deinitialize a slave's port
1938  * @slave: slave struct to work on
1939  *
1940  * Search for the aggregator that is related to this port, remove the
1941  * aggregator and assign another aggregator for other port related to it
1942  * (if any), and remove the port.
1943  */
1944 void bond_3ad_unbind_slave(struct slave *slave)
1945 {
1946         struct port *port, *prev_port, *temp_port;
1947         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1948         int select_new_active_agg = 0;
1949         
1950         // find the aggregator related to this slave
1951         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1952
1953         // find the port related to this slave
1954         port = &(SLAVE_AD_INFO(slave).port);
1955
1956         // if slave is null, the whole port is not initialized
1957         if (!port->slave) {
1958                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
1959                        "unbind an uninitialized port on %s\n",
1960                        slave->dev->master->name, slave->dev->name);
1961                 return;
1962         }
1963
1964         pr_debug("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1965
1966         /* Tell the partner that this port is not suitable for aggregation */
1967         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1968         __update_lacpdu_from_port(port);
1969         ad_lacpdu_send(port);
1970
1971         // check if this aggregator is occupied
1972         if (aggregator->lag_ports) {
1973                 // check if there are other ports related to this aggregator except
1974                 // the port related to this slave(thats ensure us that there is a
1975                 // reason to search for new aggregator, and that we will find one
1976                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1977                         // find new aggregator for the related port(s)
1978                         new_aggregator = __get_first_agg(port);
1979                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1980                                 // if the new aggregator is empty, or it connected to to our port only
1981                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1982                                         break;
1983                                 }
1984                         }
1985                         // if new aggregator found, copy the aggregator's parameters
1986                         // and connect the related lag_ports to the new aggregator
1987                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1988                                 pr_debug("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
1989
1990                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1991                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
1992                                                aggregator->slave->dev->master->name);
1993                                         // select new active aggregator
1994                                          select_new_active_agg = 1;
1995                                 }
1996
1997                                 new_aggregator->is_individual = aggregator->is_individual;
1998                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1999                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
2000                                 new_aggregator->partner_system = aggregator->partner_system;
2001                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
2002                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
2003                                 new_aggregator->receive_state = aggregator->receive_state;
2004                                 new_aggregator->transmit_state = aggregator->transmit_state;
2005                                 new_aggregator->lag_ports = aggregator->lag_ports;
2006                                 new_aggregator->is_active = aggregator->is_active;
2007                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2008
2009                                 // update the information that is written on the ports about the aggregator
2010                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2011                                         temp_port->aggregator=new_aggregator;
2012                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2013                                 }
2014
2015                                 // clear the aggregator
2016                                 ad_clear_agg(aggregator);
2017                                 
2018                                 if (select_new_active_agg) {
2019                                         ad_agg_selection_logic(__get_first_agg(port));
2020                                 }
2021                         } else {
2022                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2023                                        "and could not find a new aggregator for its ports\n",
2024                                        slave->dev->master->name);
2025                         }
2026                 } else { // in case that the only port related to this aggregator is the one we want to remove
2027                         select_new_active_agg = aggregator->is_active;
2028                         // clear the aggregator
2029                         ad_clear_agg(aggregator);
2030                         if (select_new_active_agg) {
2031                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2032                                        slave->dev->master->name);
2033                                 // select new active aggregator
2034                                 ad_agg_selection_logic(__get_first_agg(port));
2035                         }
2036                 }
2037         }
2038
2039         pr_debug("Unbinding port %d\n", port->actor_port_number);
2040         // find the aggregator that this port is connected to
2041         temp_aggregator = __get_first_agg(port);
2042         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2043                 prev_port = NULL;
2044                 // search the port in the aggregator's related ports
2045                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2046                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2047                                 if (prev_port) {
2048                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2049                                 } else {
2050                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2051                                 }
2052                                 temp_aggregator->num_of_ports--;
2053                                 if (temp_aggregator->num_of_ports==0) {
2054                                         select_new_active_agg = temp_aggregator->is_active;
2055                                         // clear the aggregator
2056                                         ad_clear_agg(temp_aggregator);
2057                                         if (select_new_active_agg) {
2058                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2059                                                        slave->dev->master->name);
2060                                                 // select new active aggregator
2061                                                 ad_agg_selection_logic(__get_first_agg(port));
2062                                         }
2063                                 }
2064                                 break;
2065                         }
2066                 }
2067         }
2068         port->slave=NULL;       
2069 }
2070
2071 /**
2072  * bond_3ad_state_machine_handler - handle state machines timeout
2073  * @bond: bonding struct to work on
2074  *
2075  * The state machine handling concept in this module is to check every tick
2076  * which state machine should operate any function. The execution order is
2077  * round robin, so when we have an interaction between state machines, the
2078  * reply of one to each other might be delayed until next tick.
2079  *
2080  * This function also complete the initialization when the agg_select_timer
2081  * times out, and it selects an aggregator for the ports that are yet not
2082  * related to any aggregator, and selects the active aggregator for a bond.
2083  */
2084 void bond_3ad_state_machine_handler(struct work_struct *work)
2085 {
2086         struct bonding *bond = container_of(work, struct bonding,
2087                                             ad_work.work);
2088         struct port *port;
2089         struct aggregator *aggregator;
2090
2091         read_lock(&bond->lock);
2092
2093         if (bond->kill_timers) {
2094                 goto out;
2095         }
2096
2097         //check if there are any slaves
2098         if (bond->slave_cnt == 0) {
2099                 goto re_arm;
2100         }
2101
2102         // check if agg_select_timer timer after initialize is timed out
2103         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2104                 // select the active aggregator for the bond
2105                 if ((port = __get_first_port(bond))) {
2106                         if (!port->slave) {
2107                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2108                                        "uninitialized\n", bond->dev->name);
2109                                 goto re_arm;
2110                         }
2111
2112                         aggregator = __get_first_agg(port);
2113                         ad_agg_selection_logic(aggregator);
2114                 }
2115                 bond_3ad_set_carrier(bond);
2116         }
2117
2118         // for each port run the state machines
2119         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2120                 if (!port->slave) {
2121                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2122                                "port\n", bond->dev->name);
2123                         goto re_arm;
2124                 }
2125
2126                 ad_rx_machine(NULL, port);
2127                 ad_periodic_machine(port);
2128                 ad_port_selection_logic(port);
2129                 ad_mux_machine(port);
2130                 ad_tx_machine(port);
2131
2132                 // turn off the BEGIN bit, since we already handled it
2133                 if (port->sm_vars & AD_PORT_BEGIN) {
2134                         port->sm_vars &= ~AD_PORT_BEGIN;
2135                 }
2136         }
2137
2138 re_arm:
2139         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2140 out:
2141         read_unlock(&bond->lock);
2142 }
2143
2144 /**
2145  * bond_3ad_rx_indication - handle a received frame
2146  * @lacpdu: received lacpdu
2147  * @slave: slave struct to work on
2148  * @length: length of the data received
2149  *
2150  * It is assumed that frames that were sent on this NIC don't returned as new
2151  * received frames (loopback). Since only the payload is given to this
2152  * function, it check for loopback.
2153  */
2154 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2155 {
2156         struct port *port;
2157
2158         if (length >= sizeof(struct lacpdu)) {
2159
2160                 port = &(SLAVE_AD_INFO(slave).port);
2161
2162                 if (!port->slave) {
2163                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2164                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2165                         return;
2166                 }
2167
2168                 switch (lacpdu->subtype) {
2169                 case AD_TYPE_LACPDU:
2170                         pr_debug("Received LACPDU on port %d\n", port->actor_port_number);
2171                         ad_rx_machine(lacpdu, port);
2172                         break;
2173
2174                 case AD_TYPE_MARKER:
2175                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2176
2177                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2178                         case AD_MARKER_INFORMATION_SUBTYPE:
2179                                 pr_debug("Received Marker Information on port %d\n", port->actor_port_number);
2180                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2181                                 break;
2182
2183                         case AD_MARKER_RESPONSE_SUBTYPE:
2184                                 pr_debug("Received Marker Response on port %d\n", port->actor_port_number);
2185                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2186                                 break;
2187
2188                         default:
2189                                 pr_debug("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2190                         }
2191                 }
2192         }
2193 }
2194
2195 /**
2196  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2197  * @slave: slave struct to work on
2198  *
2199  * Handle reselection of aggregator (if needed) for this port.
2200  */
2201 void bond_3ad_adapter_speed_changed(struct slave *slave)
2202 {
2203         struct port *port;
2204
2205         port = &(SLAVE_AD_INFO(slave).port);
2206
2207         // if slave is null, the whole port is not initialized
2208         if (!port->slave) {
2209                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2210                        "changed for uninitialized port on %s\n",
2211                        slave->dev->master->name, slave->dev->name);
2212                 return;
2213         }
2214
2215         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2216         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2217         pr_debug("Port %d changed speed\n", port->actor_port_number);
2218         // there is no need to reselect a new aggregator, just signal the
2219         // state machines to reinitialize
2220         port->sm_vars |= AD_PORT_BEGIN;
2221 }
2222
2223 /**
2224  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2225  * @slave: slave struct to work on
2226  *
2227  * Handle reselection of aggregator (if needed) for this port.
2228  */
2229 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2230 {
2231         struct port *port;
2232
2233         port=&(SLAVE_AD_INFO(slave).port);
2234
2235         // if slave is null, the whole port is not initialized
2236         if (!port->slave) {
2237                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2238                        "for uninitialized port on %s\n",
2239                        slave->dev->master->name, slave->dev->name);
2240                 return;
2241         }
2242
2243         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2244         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2245         pr_debug("Port %d changed duplex\n", port->actor_port_number);
2246         // there is no need to reselect a new aggregator, just signal the
2247         // state machines to reinitialize
2248         port->sm_vars |= AD_PORT_BEGIN;
2249 }
2250
2251 /**
2252  * bond_3ad_handle_link_change - handle a slave's link status change indication
2253  * @slave: slave struct to work on
2254  * @status: whether the link is now up or down
2255  *
2256  * Handle reselection of aggregator (if needed) for this port.
2257  */
2258 void bond_3ad_handle_link_change(struct slave *slave, char link)
2259 {
2260         struct port *port;
2261
2262         port = &(SLAVE_AD_INFO(slave).port);
2263
2264         // if slave is null, the whole port is not initialized
2265         if (!port->slave) {
2266                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2267                        "uninitialized port on %s\n",
2268                         slave->dev->master->name, slave->dev->name);
2269                 return;
2270         }
2271
2272         // on link down we are zeroing duplex and speed since some of the adaptors(ce1000.lan) report full duplex/speed instead of N/A(duplex) / 0(speed)
2273         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2274         if (link == BOND_LINK_UP) {
2275                 port->is_enabled = true;
2276                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2277                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2278                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2279                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2280         } else {
2281                 /* link has failed */
2282                 port->is_enabled = false;
2283                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2284                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2285         }
2286         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2287         // there is no need to reselect a new aggregator, just signal the
2288         // state machines to reinitialize
2289         port->sm_vars |= AD_PORT_BEGIN;
2290 }
2291
2292 /*
2293  * set link state for bonding master: if we have an active 
2294  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2295  * have an active aggregator if there are no slaves with link up.
2296  *
2297  * This behavior complies with IEEE 802.3 section 43.3.9.
2298  *
2299  * Called by bond_set_carrier(). Return zero if carrier state does not
2300  * change, nonzero if it does.
2301  */
2302 int bond_3ad_set_carrier(struct bonding *bond)
2303 {
2304         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2305                 if (!netif_carrier_ok(bond->dev)) {
2306                         netif_carrier_on(bond->dev);
2307                         return 1;
2308                 }
2309                 return 0;
2310         }
2311
2312         if (netif_carrier_ok(bond->dev)) {
2313                 netif_carrier_off(bond->dev);
2314                 return 1;
2315         }
2316         return 0;
2317 }
2318
2319 /**
2320  * bond_3ad_get_active_agg_info - get information of the active aggregator
2321  * @bond: bonding struct to work on
2322  * @ad_info: ad_info struct to fill with the bond's info
2323  *
2324  * Returns:   0 on success
2325  *          < 0 on error
2326  */
2327 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2328 {
2329         struct aggregator *aggregator = NULL;
2330         struct port *port;
2331
2332         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2333                 if (port->aggregator && port->aggregator->is_active) {
2334                         aggregator = port->aggregator;
2335                         break;
2336                 }
2337         }
2338
2339         if (aggregator) {
2340                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2341                 ad_info->ports = aggregator->num_of_ports;
2342                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2343                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2344                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2345                 return 0;
2346         }
2347
2348         return -1;
2349 }
2350
2351 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2352 {
2353         struct slave *slave, *start_at;
2354         struct bonding *bond = netdev_priv(dev);
2355         int slave_agg_no;
2356         int slaves_in_agg;
2357         int agg_id;
2358         int i;
2359         struct ad_info ad_info;
2360         int res = 1;
2361
2362         /* make sure that the slaves list will
2363          * not change during tx
2364          */
2365         read_lock(&bond->lock);
2366
2367         if (!BOND_IS_OK(bond)) {
2368                 goto out;
2369         }
2370
2371         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2372                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2373                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2374                 goto out;
2375         }
2376
2377         slaves_in_agg = ad_info.ports;
2378         agg_id = ad_info.aggregator_id;
2379
2380         if (slaves_in_agg == 0) {
2381                 /*the aggregator is empty*/
2382                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2383                        "aggregator is empty\n",
2384                        dev->name);
2385                 goto out;
2386         }
2387
2388         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2389
2390         bond_for_each_slave(bond, slave, i) {
2391                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2392
2393                 if (agg && (agg->aggregator_identifier == agg_id)) {
2394                         slave_agg_no--;
2395                         if (slave_agg_no < 0) {
2396                                 break;
2397                         }
2398                 }
2399         }
2400
2401         if (slave_agg_no >= 0) {
2402                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2403                        "for aggregator ID %d\n", dev->name, agg_id);
2404                 goto out;
2405         }
2406
2407         start_at = slave;
2408
2409         bond_for_each_slave_from(bond, slave, i, start_at) {
2410                 int slave_agg_id = 0;
2411                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2412
2413                 if (agg) {
2414                         slave_agg_id = agg->aggregator_identifier;
2415                 }
2416
2417                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2418                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2419                         break;
2420                 }
2421         }
2422
2423 out:
2424         if (res) {
2425                 /* no suitable interface, frame not sent */
2426                 dev_kfree_skb(skb);
2427         }
2428         read_unlock(&bond->lock);
2429         return 0;
2430 }
2431
2432 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2433 {
2434         struct bonding *bond = netdev_priv(dev);
2435         struct slave *slave = NULL;
2436         int ret = NET_RX_DROP;
2437
2438         if (dev_net(dev) != &init_net)
2439                 goto out;
2440
2441         if (!(dev->flags & IFF_MASTER))
2442                 goto out;
2443
2444         read_lock(&bond->lock);
2445         slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev),
2446                                         orig_dev);
2447         if (!slave)
2448                 goto out_unlock;
2449
2450         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2451
2452         ret = NET_RX_SUCCESS;
2453
2454 out_unlock:
2455         read_unlock(&bond->lock);
2456 out:
2457         dev_kfree_skb(skb);
2458
2459         return ret;
2460 }
2461