[NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS.
[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 //#define BONDING_DEBUG 1
24
25 #include <linux/skbuff.h>
26 #include <linux/if_ether.h>
27 #include <linux/netdevice.h>
28 #include <linux/spinlock.h>
29 #include <linux/ethtool.h>
30 #include <linux/if_bonding.h>
31 #include <linux/pkt_sched.h>
32 #include <net/net_namespace.h>
33 #include "bonding.h"
34 #include "bond_3ad.h"
35
36 // General definitions
37 #define AD_SHORT_TIMEOUT           1
38 #define AD_LONG_TIMEOUT            0
39 #define AD_STANDBY                 0x2
40 #define AD_MAX_TX_IN_SECOND        3
41 #define AD_COLLECTOR_MAX_DELAY     0
42
43 // Timer definitions(43.4.4 in the 802.3ad standard)
44 #define AD_FAST_PERIODIC_TIME      1
45 #define AD_SLOW_PERIODIC_TIME      30
46 #define AD_SHORT_TIMEOUT_TIME      (3*AD_FAST_PERIODIC_TIME)
47 #define AD_LONG_TIMEOUT_TIME       (3*AD_SLOW_PERIODIC_TIME)
48 #define AD_CHURN_DETECTION_TIME    60
49 #define AD_AGGREGATE_WAIT_TIME     2
50
51 // Port state definitions(43.4.2.2 in the 802.3ad standard)
52 #define AD_STATE_LACP_ACTIVITY   0x1
53 #define AD_STATE_LACP_TIMEOUT    0x2
54 #define AD_STATE_AGGREGATION     0x4
55 #define AD_STATE_SYNCHRONIZATION 0x8
56 #define AD_STATE_COLLECTING      0x10
57 #define AD_STATE_DISTRIBUTING    0x20
58 #define AD_STATE_DEFAULTED       0x40
59 #define AD_STATE_EXPIRED         0x80
60
61 // Port Variables definitions used by the State Machines(43.4.7 in the 802.3ad standard)
62 #define AD_PORT_BEGIN           0x1
63 #define AD_PORT_LACP_ENABLED    0x2
64 #define AD_PORT_ACTOR_CHURN     0x4
65 #define AD_PORT_PARTNER_CHURN   0x8
66 #define AD_PORT_READY           0x10
67 #define AD_PORT_READY_N         0x20
68 #define AD_PORT_MATCHED         0x40
69 #define AD_PORT_STANDBY         0x80
70 #define AD_PORT_SELECTED        0x100
71 #define AD_PORT_MOVED           0x200
72
73 // Port Key definitions
74 // key is determined according to the link speed, duplex and
75 // user key(which is yet not supported)
76 //              ------------------------------------------------------------
77 // Port key :   | User key                       |      Speed       |Duplex|
78 //              ------------------------------------------------------------
79 //              16                               6               1 0
80 #define  AD_DUPLEX_KEY_BITS    0x1
81 #define  AD_SPEED_KEY_BITS     0x3E
82 #define  AD_USER_KEY_BITS      0xFFC0
83
84 //dalloun
85 #define     AD_LINK_SPEED_BITMASK_1MBPS       0x1
86 #define     AD_LINK_SPEED_BITMASK_10MBPS      0x2
87 #define     AD_LINK_SPEED_BITMASK_100MBPS     0x4
88 #define     AD_LINK_SPEED_BITMASK_1000MBPS    0x8
89 #define     AD_LINK_SPEED_BITMASK_10000MBPS   0x10
90 //endalloun
91
92 // compare MAC addresses
93 #define MAC_ADDRESS_COMPARE(A, B) memcmp(A, B, ETH_ALEN)
94
95 static struct mac_addr null_mac_addr = {{0, 0, 0, 0, 0, 0}};
96 static u16 ad_ticks_per_sec;
97 static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000;
98
99 // ================= 3AD api to bonding and kernel code ==================
100 static u16 __get_link_speed(struct port *port);
101 static u8 __get_duplex(struct port *port);
102 static inline void __initialize_port_locks(struct port *port);
103 //conversions
104 static u16 __ad_timer_to_ticks(u16 timer_type, u16 Par);
105
106
107 // ================= ad code helper functions ==================
108 //needed by ad_rx_machine(...)
109 static void __record_pdu(struct lacpdu *lacpdu, struct port *port);
110 static void __record_default(struct port *port);
111 static void __update_selected(struct lacpdu *lacpdu, struct port *port);
112 static void __update_default_selected(struct port *port);
113 static void __choose_matched(struct lacpdu *lacpdu, struct port *port);
114 static void __update_ntt(struct lacpdu *lacpdu, struct port *port);
115
116 //needed for ad_mux_machine(..)
117 static void __attach_bond_to_agg(struct port *port);
118 static void __detach_bond_from_agg(struct port *port);
119 static int __agg_ports_are_ready(struct aggregator *aggregator);
120 static void __set_agg_ports_ready(struct aggregator *aggregator, int val);
121
122 //needed for ad_agg_selection_logic(...)
123 static u32 __get_agg_bandwidth(struct aggregator *aggregator);
124 static struct aggregator *__get_active_agg(struct aggregator *aggregator);
125
126
127 // ================= main 802.3ad protocol functions ==================
128 static int ad_lacpdu_send(struct port *port);
129 static int ad_marker_send(struct port *port, struct bond_marker *marker);
130 static void ad_mux_machine(struct port *port);
131 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port);
132 static void ad_tx_machine(struct port *port);
133 static void ad_periodic_machine(struct port *port);
134 static void ad_port_selection_logic(struct port *port);
135 static void ad_agg_selection_logic(struct aggregator *aggregator);
136 static void ad_clear_agg(struct aggregator *aggregator);
137 static void ad_initialize_agg(struct aggregator *aggregator);
138 static void ad_initialize_port(struct port *port, int lacp_fast);
139 static void ad_initialize_lacpdu(struct lacpdu *Lacpdu);
140 static void ad_enable_collecting_distributing(struct port *port);
141 static void ad_disable_collecting_distributing(struct port *port);
142 static void ad_marker_info_received(struct bond_marker *marker_info, struct port *port);
143 static void ad_marker_response_received(struct bond_marker *marker, struct port *port);
144
145
146 /////////////////////////////////////////////////////////////////////////////////
147 // ================= api to bonding and kernel code ==================
148 /////////////////////////////////////////////////////////////////////////////////
149
150 /**
151  * __get_bond_by_port - get the port's bonding struct
152  * @port: the port we're looking at
153  *
154  * Return @port's bonding struct, or %NULL if it can't be found.
155  */
156 static inline struct bonding *__get_bond_by_port(struct port *port)
157 {
158         if (port->slave == NULL) {
159                 return NULL;
160         }
161
162         return bond_get_bond_by_slave(port->slave);
163 }
164
165 /**
166  * __get_first_port - get the first port in the bond
167  * @bond: the bond we're looking at
168  *
169  * Return the port of the first slave in @bond, or %NULL if it can't be found.
170  */
171 static inline struct port *__get_first_port(struct bonding *bond)
172 {
173         if (bond->slave_cnt == 0) {
174                 return NULL;
175         }
176
177         return &(SLAVE_AD_INFO(bond->first_slave).port);
178 }
179
180 /**
181  * __get_next_port - get the next port in the bond
182  * @port: the port we're looking at
183  *
184  * Return the port of the slave that is next in line of @port's slave in the
185  * bond, or %NULL if it can't be found.
186  */
187 static inline struct port *__get_next_port(struct port *port)
188 {
189         struct bonding *bond = __get_bond_by_port(port);
190         struct slave *slave = port->slave;
191
192         // If there's no bond for this port, or this is the last slave
193         if ((bond == NULL) || (slave->next == bond->first_slave)) {
194                 return NULL;
195         }
196
197         return &(SLAVE_AD_INFO(slave->next).port);
198 }
199
200 /**
201  * __get_first_agg - get the first aggregator in the bond
202  * @bond: the bond we're looking at
203  *
204  * Return the aggregator of the first slave in @bond, or %NULL if it can't be
205  * found.
206  */
207 static inline struct aggregator *__get_first_agg(struct port *port)
208 {
209         struct bonding *bond = __get_bond_by_port(port);
210
211         // If there's no bond for this port, or bond has no slaves
212         if ((bond == NULL) || (bond->slave_cnt == 0)) {
213                 return NULL;
214         }
215
216         return &(SLAVE_AD_INFO(bond->first_slave).aggregator);
217 }
218
219 /**
220  * __get_next_agg - get the next aggregator in the bond
221  * @aggregator: the aggregator we're looking at
222  *
223  * Return the aggregator of the slave that is next in line of @aggregator's
224  * slave in the bond, or %NULL if it can't be found.
225  */
226 static inline struct aggregator *__get_next_agg(struct aggregator *aggregator)
227 {
228         struct slave *slave = aggregator->slave;
229         struct bonding *bond = bond_get_bond_by_slave(slave);
230
231         // If there's no bond for this aggregator, or this is the last slave
232         if ((bond == NULL) || (slave->next == bond->first_slave)) {
233                 return NULL;
234         }
235
236         return &(SLAVE_AD_INFO(slave->next).aggregator);
237 }
238
239 /**
240  * __disable_port - disable the port's slave
241  * @port: the port we're looking at
242  *
243  */
244 static inline void __disable_port(struct port *port)
245 {
246         bond_set_slave_inactive_flags(port->slave);
247 }
248
249 /**
250  * __enable_port - enable the port's slave, if it's up
251  * @port: the port we're looking at
252  *
253  */
254 static inline void __enable_port(struct port *port)
255 {
256         struct slave *slave = port->slave;
257
258         if ((slave->link == BOND_LINK_UP) && IS_UP(slave->dev)) {
259                 bond_set_slave_active_flags(slave);
260         }
261 }
262
263 /**
264  * __port_is_enabled - check if the port's slave is in active state
265  * @port: the port we're looking at
266  *
267  */
268 static inline int __port_is_enabled(struct port *port)
269 {
270         return(port->slave->state == BOND_STATE_ACTIVE);
271 }
272
273 /**
274  * __get_agg_selection_mode - get the aggregator selection mode
275  * @port: the port we're looking at
276  *
277  * Get the aggregator selection mode. Can be %BANDWIDTH or %COUNT.
278  */
279 static inline u32 __get_agg_selection_mode(struct port *port)
280 {
281         struct bonding *bond = __get_bond_by_port(port);
282
283         if (bond == NULL) {
284                 return AD_BANDWIDTH;
285         }
286
287         return BOND_AD_INFO(bond).agg_select_mode;
288 }
289
290 /**
291  * __check_agg_selection_timer - check if the selection timer has expired
292  * @port: the port we're looking at
293  *
294  */
295 static inline int __check_agg_selection_timer(struct port *port)
296 {
297         struct bonding *bond = __get_bond_by_port(port);
298
299         if (bond == NULL) {
300                 return 0;
301         }
302
303         return BOND_AD_INFO(bond).agg_select_timer ? 1 : 0;
304 }
305
306 /**
307  * __get_rx_machine_lock - lock the port's RX machine
308  * @port: the port we're looking at
309  *
310  */
311 static inline void __get_rx_machine_lock(struct port *port)
312 {
313         spin_lock(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
314 }
315
316 /**
317  * __release_rx_machine_lock - unlock the port's RX machine
318  * @port: the port we're looking at
319  *
320  */
321 static inline void __release_rx_machine_lock(struct port *port)
322 {
323         spin_unlock(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
324 }
325
326 /**
327  * __get_link_speed - get a port's speed
328  * @port: the port we're looking at
329  *
330  * Return @port's speed in 802.3ad bitmask format. i.e. one of:
331  *     0,
332  *     %AD_LINK_SPEED_BITMASK_10MBPS,
333  *     %AD_LINK_SPEED_BITMASK_100MBPS,
334  *     %AD_LINK_SPEED_BITMASK_1000MBPS,
335  *     %AD_LINK_SPEED_BITMASK_10000MBPS
336  */
337 static u16 __get_link_speed(struct port *port)
338 {
339         struct slave *slave = port->slave;
340         u16 speed;
341
342         /* this if covers only a special case: when the configuration starts with
343          * link down, it sets the speed to 0.
344          * This is done in spite of the fact that the e100 driver reports 0 to be
345          * compatible with MVT in the future.*/
346         if (slave->link != BOND_LINK_UP) {
347                 speed=0;
348         } else {
349                 switch (slave->speed) {
350                 case SPEED_10:
351                         speed = AD_LINK_SPEED_BITMASK_10MBPS;
352                         break;
353
354                 case SPEED_100:
355                         speed = AD_LINK_SPEED_BITMASK_100MBPS;
356                         break;
357
358                 case SPEED_1000:
359                         speed = AD_LINK_SPEED_BITMASK_1000MBPS;
360                         break;
361
362                 case SPEED_10000:
363                         speed = AD_LINK_SPEED_BITMASK_10000MBPS;
364                         break;
365
366                 default:
367                         speed = 0; // unknown speed value from ethtool. shouldn't happen
368                         break;
369                 }
370         }
371
372         dprintk("Port %d Received link speed %d update from adapter\n", port->actor_port_number, speed);
373         return speed;
374 }
375
376 /**
377  * __get_duplex - get a port's duplex
378  * @port: the port we're looking at
379  *
380  * Return @port's duplex in 802.3ad bitmask format. i.e.:
381  *     0x01 if in full duplex
382  *     0x00 otherwise
383  */
384 static u8 __get_duplex(struct port *port)
385 {
386         struct slave *slave = port->slave;
387
388         u8 retval;
389
390         //  handling a special case: when the configuration starts with
391         // link down, it sets the duplex to 0.
392         if (slave->link != BOND_LINK_UP) {
393                 retval=0x0;
394         } else {
395                 switch (slave->duplex) {
396                 case DUPLEX_FULL:
397                         retval=0x1;
398                         dprintk("Port %d Received status full duplex update from adapter\n", port->actor_port_number);
399                         break;
400                 case DUPLEX_HALF:
401                 default:
402                         retval=0x0;
403                         dprintk("Port %d Received status NOT full duplex update from adapter\n", port->actor_port_number);
404                         break;
405                 }
406         }
407         return retval;
408 }
409
410 /**
411  * __initialize_port_locks - initialize a port's RX machine spinlock
412  * @port: the port we're looking at
413  *
414  */
415 static inline void __initialize_port_locks(struct port *port)
416 {
417         // make sure it isn't called twice
418         spin_lock_init(&(SLAVE_AD_INFO(port->slave).rx_machine_lock));
419 }
420
421 //conversions
422
423 /**
424  * __ad_timer_to_ticks - convert a given timer type to AD module ticks
425  * @timer_type: which timer to operate
426  * @par: timer parameter. see below
427  *
428  * If @timer_type is %current_while_timer, @par indicates long/short timer.
429  * If @timer_type is %periodic_timer, @par is one of %FAST_PERIODIC_TIME,
430  *                                                  %SLOW_PERIODIC_TIME.
431  */
432 static u16 __ad_timer_to_ticks(u16 timer_type, u16 par)
433 {
434         u16 retval=0;    //to silence the compiler
435
436         switch (timer_type) {
437         case AD_CURRENT_WHILE_TIMER:   // for rx machine usage
438                 if (par) {            // for short or long timeout
439                         retval = (AD_SHORT_TIMEOUT_TIME*ad_ticks_per_sec); // short timeout
440                 } else {
441                         retval = (AD_LONG_TIMEOUT_TIME*ad_ticks_per_sec); // long timeout
442                 }
443                 break;
444         case AD_ACTOR_CHURN_TIMER:          // for local churn machine
445                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
446                 break;
447         case AD_PERIODIC_TIMER:     // for periodic machine
448                 retval = (par*ad_ticks_per_sec); // long timeout
449                 break;
450         case AD_PARTNER_CHURN_TIMER:   // for remote churn machine
451                 retval = (AD_CHURN_DETECTION_TIME*ad_ticks_per_sec);
452                 break;
453         case AD_WAIT_WHILE_TIMER:           // for selection machine
454                 retval = (AD_AGGREGATE_WAIT_TIME*ad_ticks_per_sec);
455                 break;
456         }
457         return retval;
458 }
459
460
461 /////////////////////////////////////////////////////////////////////////////////
462 // ================= ad_rx_machine helper functions ==================
463 /////////////////////////////////////////////////////////////////////////////////
464
465 /**
466  * __record_pdu - record parameters from a received lacpdu
467  * @lacpdu: the lacpdu we've received
468  * @port: the port we're looking at
469  *
470  * Record the parameter values for the Actor carried in a received lacpdu as
471  * the current partner operational parameter values and sets
472  * actor_oper_port_state.defaulted to FALSE.
473  */
474 static void __record_pdu(struct lacpdu *lacpdu, struct port *port)
475 {
476         // validate lacpdu and port
477         if (lacpdu && port) {
478                 // record the new parameter values for the partner operational
479                 port->partner_oper_port_number = ntohs(lacpdu->actor_port);
480                 port->partner_oper_port_priority = ntohs(lacpdu->actor_port_priority);
481                 port->partner_oper_system = lacpdu->actor_system;
482                 port->partner_oper_system_priority = ntohs(lacpdu->actor_system_priority);
483                 port->partner_oper_key = ntohs(lacpdu->actor_key);
484                 // zero partener's lase states
485                 port->partner_oper_port_state = 0;
486                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_ACTIVITY);
487                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_LACP_TIMEOUT);
488                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_AGGREGATION);
489                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION);
490                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_COLLECTING);
491                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DISTRIBUTING);
492                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_DEFAULTED);
493                 port->partner_oper_port_state |= (lacpdu->actor_state & AD_STATE_EXPIRED);
494
495                 // set actor_oper_port_state.defaulted to FALSE
496                 port->actor_oper_port_state &= ~AD_STATE_DEFAULTED;
497
498                 // set the partner sync. to on if the partner is sync. and the port is matched
499                 if ((port->sm_vars & AD_PORT_MATCHED) && (lacpdu->actor_state & AD_STATE_SYNCHRONIZATION)) {
500                         port->partner_oper_port_state |= AD_STATE_SYNCHRONIZATION;
501                 } else {
502                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
503                 }
504         }
505 }
506
507 /**
508  * __record_default - record default parameters
509  * @port: the port we're looking at
510  *
511  * This function records the default parameter values for the partner carried
512  * in the Partner Admin parameters as the current partner operational parameter
513  * values and sets actor_oper_port_state.defaulted to TRUE.
514  */
515 static void __record_default(struct port *port)
516 {
517         // validate the port
518         if (port) {
519                 // record the partner admin parameters
520                 port->partner_oper_port_number = port->partner_admin_port_number;
521                 port->partner_oper_port_priority = port->partner_admin_port_priority;
522                 port->partner_oper_system = port->partner_admin_system;
523                 port->partner_oper_system_priority = port->partner_admin_system_priority;
524                 port->partner_oper_key = port->partner_admin_key;
525                 port->partner_oper_port_state = port->partner_admin_port_state;
526
527                 // set actor_oper_port_state.defaulted to true
528                 port->actor_oper_port_state |= AD_STATE_DEFAULTED;
529         }
530 }
531
532 /**
533  * __update_selected - update a port's Selected variable from a received lacpdu
534  * @lacpdu: the lacpdu we've received
535  * @port: the port we're looking at
536  *
537  * Update the value of the selected variable, using parameter values from a
538  * newly received lacpdu. The parameter values for the Actor carried in the
539  * received PDU are compared with the corresponding operational parameter
540  * values for the ports partner. If one or more of the comparisons shows that
541  * the value(s) received in the PDU differ from the current operational values,
542  * then selected is set to FALSE and actor_oper_port_state.synchronization is
543  * set to out_of_sync. Otherwise, selected remains unchanged.
544  */
545 static void __update_selected(struct lacpdu *lacpdu, struct port *port)
546 {
547         // validate lacpdu and port
548         if (lacpdu && port) {
549                 // check if any parameter is different
550                 if ((ntohs(lacpdu->actor_port) != port->partner_oper_port_number) ||
551                     (ntohs(lacpdu->actor_port_priority) != port->partner_oper_port_priority) ||
552                     MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->partner_oper_system)) ||
553                     (ntohs(lacpdu->actor_system_priority) != port->partner_oper_system_priority) ||
554                     (ntohs(lacpdu->actor_key) != port->partner_oper_key) ||
555                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
556                    ) {
557                         // update the state machine Selected variable
558                         port->sm_vars &= ~AD_PORT_SELECTED;
559                 }
560         }
561 }
562
563 /**
564  * __update_default_selected - update a port's Selected variable from Partner
565  * @port: the port we're looking at
566  *
567  * This function updates the value of the selected variable, using the partner
568  * administrative parameter values. The administrative values are compared with
569  * the corresponding operational parameter values for the partner. If one or
570  * more of the comparisons shows that the administrative value(s) differ from
571  * the current operational values, then Selected is set to FALSE and
572  * actor_oper_port_state.synchronization is set to OUT_OF_SYNC. Otherwise,
573  * Selected remains unchanged.
574  */
575 static void __update_default_selected(struct port *port)
576 {
577         // validate the port
578         if (port) {
579                 // check if any parameter is different
580                 if ((port->partner_admin_port_number != port->partner_oper_port_number) ||
581                     (port->partner_admin_port_priority != port->partner_oper_port_priority) ||
582                     MAC_ADDRESS_COMPARE(&(port->partner_admin_system), &(port->partner_oper_system)) ||
583                     (port->partner_admin_system_priority != port->partner_oper_system_priority) ||
584                     (port->partner_admin_key != port->partner_oper_key) ||
585                     ((port->partner_admin_port_state & AD_STATE_AGGREGATION) != (port->partner_oper_port_state & AD_STATE_AGGREGATION))
586                    ) {
587                         // update the state machine Selected variable
588                         port->sm_vars &= ~AD_PORT_SELECTED;
589                 }
590         }
591 }
592
593 /**
594  * __choose_matched - update a port's matched variable from a received lacpdu
595  * @lacpdu: the lacpdu we've received
596  * @port: the port we're looking at
597  *
598  * Update the value of the matched variable, using parameter values from a
599  * newly received lacpdu. Parameter values for the partner carried in the
600  * received PDU are compared with the corresponding operational parameter
601  * values for the actor. Matched is set to TRUE if all of these parameters
602  * match and the PDU parameter partner_state.aggregation has the same value as
603  * actor_oper_port_state.aggregation and lacp will actively maintain the link
604  * in the aggregation. Matched is also set to TRUE if the value of
605  * actor_state.aggregation in the received PDU is set to FALSE, i.e., indicates
606  * an individual link and lacp will actively maintain the link. Otherwise,
607  * matched is set to FALSE. LACP is considered to be actively maintaining the
608  * link if either the PDU's actor_state.lacp_activity variable is TRUE or both
609  * the actor's actor_oper_port_state.lacp_activity and the PDU's
610  * partner_state.lacp_activity variables are TRUE.
611  */
612 static void __choose_matched(struct lacpdu *lacpdu, struct port *port)
613 {
614         // validate lacpdu and port
615         if (lacpdu && port) {
616                 // check if all parameters are alike
617                 if (((ntohs(lacpdu->partner_port) == port->actor_port_number) &&
618                      (ntohs(lacpdu->partner_port_priority) == port->actor_port_priority) &&
619                      !MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) &&
620                      (ntohs(lacpdu->partner_system_priority) == port->actor_system_priority) &&
621                      (ntohs(lacpdu->partner_key) == port->actor_oper_port_key) &&
622                      ((lacpdu->partner_state & AD_STATE_AGGREGATION) == (port->actor_oper_port_state & AD_STATE_AGGREGATION))) ||
623                     // or this is individual link(aggregation == FALSE)
624                     ((lacpdu->actor_state & AD_STATE_AGGREGATION) == 0)
625                    ) {
626                         // update the state machine Matched variable
627                         port->sm_vars |= AD_PORT_MATCHED;
628                 } else {
629                         port->sm_vars &= ~AD_PORT_MATCHED;
630                 }
631         }
632 }
633
634 /**
635  * __update_ntt - update a port's ntt variable from a received lacpdu
636  * @lacpdu: the lacpdu we've received
637  * @port: the port we're looking at
638  *
639  * Updates the value of the ntt variable, using parameter values from a newly
640  * received lacpdu. The parameter values for the partner carried in the
641  * received PDU are compared with the corresponding operational parameter
642  * values for the Actor. If one or more of the comparisons shows that the
643  * value(s) received in the PDU differ from the current operational values,
644  * then ntt is set to TRUE. Otherwise, ntt remains unchanged.
645  */
646 static void __update_ntt(struct lacpdu *lacpdu, struct port *port)
647 {
648         // validate lacpdu and port
649         if (lacpdu && port) {
650                 // check if any parameter is different
651                 if ((ntohs(lacpdu->partner_port) != port->actor_port_number) ||
652                     (ntohs(lacpdu->partner_port_priority) != port->actor_port_priority) ||
653                     MAC_ADDRESS_COMPARE(&(lacpdu->partner_system), &(port->actor_system)) ||
654                     (ntohs(lacpdu->partner_system_priority) != port->actor_system_priority) ||
655                     (ntohs(lacpdu->partner_key) != port->actor_oper_port_key) ||
656                     ((lacpdu->partner_state & AD_STATE_LACP_ACTIVITY) != (port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY)) ||
657                     ((lacpdu->partner_state & AD_STATE_LACP_TIMEOUT) != (port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT)) ||
658                     ((lacpdu->partner_state & AD_STATE_SYNCHRONIZATION) != (port->actor_oper_port_state & AD_STATE_SYNCHRONIZATION)) ||
659                     ((lacpdu->partner_state & AD_STATE_AGGREGATION) != (port->actor_oper_port_state & AD_STATE_AGGREGATION))
660                    ) {
661                         // set ntt to be TRUE
662                         port->ntt = 1;
663                 }
664         }
665 }
666
667 /**
668  * __attach_bond_to_agg
669  * @port: the port we're looking at
670  *
671  * Handle the attaching of the port's control parser/multiplexer and the
672  * aggregator. This function does nothing since the parser/multiplexer of the
673  * receive and the parser/multiplexer of the aggregator are already combined.
674  */
675 static void __attach_bond_to_agg(struct port *port)
676 {
677         port=NULL; // just to satisfy the compiler
678         // This function does nothing since the parser/multiplexer of the receive
679         // and the parser/multiplexer of the aggregator are already combined
680 }
681
682 /**
683  * __detach_bond_from_agg
684  * @port: the port we're looking at
685  *
686  * Handle the detaching of the port's control parser/multiplexer from the
687  * aggregator. This function does nothing since the parser/multiplexer of the
688  * receive and the parser/multiplexer of the aggregator are already combined.
689  */
690 static void __detach_bond_from_agg(struct port *port)
691 {
692         port=NULL; // just to satisfy the compiler
693         // This function does nothing sience the parser/multiplexer of the receive
694         // and the parser/multiplexer of the aggregator are already combined
695 }
696
697 /**
698  * __agg_ports_are_ready - check if all ports in an aggregator are ready
699  * @aggregator: the aggregator we're looking at
700  *
701  */
702 static int __agg_ports_are_ready(struct aggregator *aggregator)
703 {
704         struct port *port;
705         int retval = 1;
706
707         if (aggregator) {
708                 // scan all ports in this aggregator to verfy if they are all ready
709                 for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
710                         if (!(port->sm_vars & AD_PORT_READY_N)) {
711                                 retval = 0;
712                                 break;
713                         }
714                 }
715         }
716
717         return retval;
718 }
719
720 /**
721  * __set_agg_ports_ready - set value of Ready bit in all ports of an aggregator
722  * @aggregator: the aggregator we're looking at
723  * @val: Should the ports' ready bit be set on or off
724  *
725  */
726 static void __set_agg_ports_ready(struct aggregator *aggregator, int val)
727 {
728         struct port *port;
729
730         for (port=aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
731                 if (val) {
732                         port->sm_vars |= AD_PORT_READY;
733                 } else {
734                         port->sm_vars &= ~AD_PORT_READY;
735                 }
736         }
737 }
738
739 /**
740  * __get_agg_bandwidth - get the total bandwidth of an aggregator
741  * @aggregator: the aggregator we're looking at
742  *
743  */
744 static u32 __get_agg_bandwidth(struct aggregator *aggregator)
745 {
746         u32 bandwidth=0;
747         u32 basic_speed;
748
749         if (aggregator->num_of_ports) {
750                 basic_speed = __get_link_speed(aggregator->lag_ports);
751                 switch (basic_speed) {
752                 case AD_LINK_SPEED_BITMASK_1MBPS:
753                         bandwidth = aggregator->num_of_ports;
754                         break;
755                 case AD_LINK_SPEED_BITMASK_10MBPS:
756                         bandwidth = aggregator->num_of_ports * 10;
757                         break;
758                 case AD_LINK_SPEED_BITMASK_100MBPS:
759                         bandwidth = aggregator->num_of_ports * 100;
760                         break;
761                 case AD_LINK_SPEED_BITMASK_1000MBPS:
762                         bandwidth = aggregator->num_of_ports * 1000;
763                         break;
764                 case AD_LINK_SPEED_BITMASK_10000MBPS:
765                         bandwidth = aggregator->num_of_ports * 10000;
766                         break;
767                 default:
768                         bandwidth=0; // to silent the compilor ....
769                 }
770         }
771         return bandwidth;
772 }
773
774 /**
775  * __get_active_agg - get the current active aggregator
776  * @aggregator: the aggregator we're looking at
777  *
778  */
779 static struct aggregator *__get_active_agg(struct aggregator *aggregator)
780 {
781         struct aggregator *retval = NULL;
782
783         for (; aggregator; aggregator = __get_next_agg(aggregator)) {
784                 if (aggregator->is_active) {
785                         retval = aggregator;
786                         break;
787                 }
788         }
789
790         return retval;
791 }
792
793 /**
794  * __update_lacpdu_from_port - update a port's lacpdu fields
795  * @port: the port we're looking at
796  *
797  */
798 static inline void __update_lacpdu_from_port(struct port *port)
799 {
800         struct lacpdu *lacpdu = &port->lacpdu;
801
802         /* update current actual Actor parameters */
803         /* lacpdu->subtype                   initialized
804          * lacpdu->version_number            initialized
805          * lacpdu->tlv_type_actor_info       initialized
806          * lacpdu->actor_information_length  initialized
807          */
808
809         lacpdu->actor_system_priority = htons(port->actor_system_priority);
810         lacpdu->actor_system = port->actor_system;
811         lacpdu->actor_key = htons(port->actor_oper_port_key);
812         lacpdu->actor_port_priority = htons(port->actor_port_priority);
813         lacpdu->actor_port = htons(port->actor_port_number);
814         lacpdu->actor_state = port->actor_oper_port_state;
815
816         /* lacpdu->reserved_3_1              initialized
817          * lacpdu->tlv_type_partner_info     initialized
818          * lacpdu->partner_information_length initialized
819          */
820
821         lacpdu->partner_system_priority = htons(port->partner_oper_system_priority);
822         lacpdu->partner_system = port->partner_oper_system;
823         lacpdu->partner_key = htons(port->partner_oper_key);
824         lacpdu->partner_port_priority = htons(port->partner_oper_port_priority);
825         lacpdu->partner_port = htons(port->partner_oper_port_number);
826         lacpdu->partner_state = port->partner_oper_port_state;
827
828         /* lacpdu->reserved_3_2              initialized
829          * lacpdu->tlv_type_collector_info   initialized
830          * lacpdu->collector_information_length initialized
831          * collector_max_delay                initialized
832          * reserved_12[12]                   initialized
833          * tlv_type_terminator               initialized
834          * terminator_length                 initialized
835          * reserved_50[50]                   initialized
836          */
837 }
838
839 //////////////////////////////////////////////////////////////////////////////////////
840 // ================= main 802.3ad protocol code ======================================
841 //////////////////////////////////////////////////////////////////////////////////////
842
843 /**
844  * ad_lacpdu_send - send out a lacpdu packet on a given port
845  * @port: the port we're looking at
846  *
847  * Returns:   0 on success
848  *          < 0 on error
849  */
850 static int ad_lacpdu_send(struct port *port)
851 {
852         struct slave *slave = port->slave;
853         struct sk_buff *skb;
854         struct lacpdu_header *lacpdu_header;
855         int length = sizeof(struct lacpdu_header);
856         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
857
858         skb = dev_alloc_skb(length);
859         if (!skb) {
860                 return -ENOMEM;
861         }
862
863         skb->dev = slave->dev;
864         skb_reset_mac_header(skb);
865         skb->network_header = skb->mac_header + ETH_HLEN;
866         skb->protocol = PKT_TYPE_LACPDU;
867         skb->priority = TC_PRIO_CONTROL;
868
869         lacpdu_header = (struct lacpdu_header *)skb_put(skb, length);
870
871         lacpdu_header->ad_header.destination_address = lacpdu_multicast_address;
872         /* Note: source addres is set to be the member's PERMANENT address, because we use it
873            to identify loopback lacpdus in receive. */
874         lacpdu_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
875         lacpdu_header->ad_header.length_type = PKT_TYPE_LACPDU;
876
877         lacpdu_header->lacpdu = port->lacpdu; // struct copy
878
879         dev_queue_xmit(skb);
880
881         return 0;
882 }
883
884 /**
885  * ad_marker_send - send marker information/response on a given port
886  * @port: the port we're looking at
887  * @marker: marker data to send
888  *
889  * Returns:   0 on success
890  *          < 0 on error
891  */
892 static int ad_marker_send(struct port *port, struct bond_marker *marker)
893 {
894         struct slave *slave = port->slave;
895         struct sk_buff *skb;
896         struct bond_marker_header *marker_header;
897         int length = sizeof(struct bond_marker_header);
898         struct mac_addr lacpdu_multicast_address = AD_MULTICAST_LACPDU_ADDR;
899
900         skb = dev_alloc_skb(length + 16);
901         if (!skb) {
902                 return -ENOMEM;
903         }
904
905         skb_reserve(skb, 16);
906
907         skb->dev = slave->dev;
908         skb_reset_mac_header(skb);
909         skb->network_header = skb->mac_header + ETH_HLEN;
910         skb->protocol = PKT_TYPE_LACPDU;
911
912         marker_header = (struct bond_marker_header *)skb_put(skb, length);
913
914         marker_header->ad_header.destination_address = lacpdu_multicast_address;
915         /* Note: source addres is set to be the member's PERMANENT address, because we use it
916            to identify loopback MARKERs in receive. */
917         marker_header->ad_header.source_address = *((struct mac_addr *)(slave->perm_hwaddr));
918         marker_header->ad_header.length_type = PKT_TYPE_LACPDU;
919
920         marker_header->marker = *marker; // struct copy
921
922         dev_queue_xmit(skb);
923
924         return 0;
925 }
926
927 /**
928  * ad_mux_machine - handle a port's mux state machine
929  * @port: the port we're looking at
930  *
931  */
932 static void ad_mux_machine(struct port *port)
933 {
934         mux_states_t last_state;
935
936         // keep current State Machine state to compare later if it was changed
937         last_state = port->sm_mux_state;
938
939         if (port->sm_vars & AD_PORT_BEGIN) {
940                 port->sm_mux_state = AD_MUX_DETACHED;            // next state
941         } else {
942                 switch (port->sm_mux_state) {
943                 case AD_MUX_DETACHED:
944                         if ((port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) { // if SELECTED or STANDBY
945                                 port->sm_mux_state = AD_MUX_WAITING; // next state
946                         }
947                         break;
948                 case AD_MUX_WAITING:
949                         // if SELECTED == FALSE return to DETACH state
950                         if (!(port->sm_vars & AD_PORT_SELECTED)) { // if UNSELECTED
951                                 port->sm_vars &= ~AD_PORT_READY_N;
952                                 // in order to withhold the Selection Logic to check all ports READY_N value
953                                 // every callback cycle to update ready variable, we check READY_N and update READY here
954                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
955                                 port->sm_mux_state = AD_MUX_DETACHED;    // next state
956                                 break;
957                         }
958
959                         // check if the wait_while_timer expired
960                         if (port->sm_mux_timer_counter && !(--port->sm_mux_timer_counter)) {
961                                 port->sm_vars |= AD_PORT_READY_N;
962                         }
963
964                         // in order to withhold the selection logic to check all ports READY_N value
965                         // every callback cycle to update ready variable, we check READY_N and update READY here
966                         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
967
968                         // if the wait_while_timer expired, and the port is in READY state, move to ATTACHED state
969                         if ((port->sm_vars & AD_PORT_READY) && !port->sm_mux_timer_counter) {
970                                 port->sm_mux_state = AD_MUX_ATTACHED;    // next state
971                         }
972                         break;
973                 case AD_MUX_ATTACHED:
974                         // check also if agg_select_timer expired(so the edable port will take place only after this timer)
975                         if ((port->sm_vars & AD_PORT_SELECTED) && (port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION) && !__check_agg_selection_timer(port)) {
976                                 port->sm_mux_state = AD_MUX_COLLECTING_DISTRIBUTING;// next state
977                         } else if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY)) {    // if UNSELECTED or STANDBY
978                                 port->sm_vars &= ~AD_PORT_READY_N;
979                                 // in order to withhold the selection logic to check all ports READY_N value
980                                 // every callback cycle to update ready variable, we check READY_N and update READY here
981                                 __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
982                                 port->sm_mux_state = AD_MUX_DETACHED;// next state
983                         }
984                         break;
985                 case AD_MUX_COLLECTING_DISTRIBUTING:
986                         if (!(port->sm_vars & AD_PORT_SELECTED) || (port->sm_vars & AD_PORT_STANDBY) ||
987                             !(port->partner_oper_port_state & AD_STATE_SYNCHRONIZATION)
988                            ) {
989                                 port->sm_mux_state = AD_MUX_ATTACHED;// next state
990
991                         } else {
992                                 // if port state hasn't changed make
993                                 // sure that a collecting distributing
994                                 // port in an active aggregator is enabled
995                                 if (port->aggregator &&
996                                     port->aggregator->is_active &&
997                                     !__port_is_enabled(port)) {
998
999                                         __enable_port(port);
1000                                 }
1001                         }
1002                         break;
1003                 default:    //to silence the compiler
1004                         break;
1005                 }
1006         }
1007
1008         // check if the state machine was changed
1009         if (port->sm_mux_state != last_state) {
1010                 dprintk("Mux Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_mux_state);
1011                 switch (port->sm_mux_state) {
1012                 case AD_MUX_DETACHED:
1013                         __detach_bond_from_agg(port);
1014                         port->actor_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1015                         ad_disable_collecting_distributing(port);
1016                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1017                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1018                         port->ntt = 1;
1019                         break;
1020                 case AD_MUX_WAITING:
1021                         port->sm_mux_timer_counter = __ad_timer_to_ticks(AD_WAIT_WHILE_TIMER, 0);
1022                         break;
1023                 case AD_MUX_ATTACHED:
1024                         __attach_bond_to_agg(port);
1025                         port->actor_oper_port_state |= AD_STATE_SYNCHRONIZATION;
1026                         port->actor_oper_port_state &= ~AD_STATE_COLLECTING;
1027                         port->actor_oper_port_state &= ~AD_STATE_DISTRIBUTING;
1028                         ad_disable_collecting_distributing(port);
1029                         port->ntt = 1;
1030                         break;
1031                 case AD_MUX_COLLECTING_DISTRIBUTING:
1032                         port->actor_oper_port_state |= AD_STATE_COLLECTING;
1033                         port->actor_oper_port_state |= AD_STATE_DISTRIBUTING;
1034                         ad_enable_collecting_distributing(port);
1035                         port->ntt = 1;
1036                         break;
1037                 default:    //to silence the compiler
1038                         break;
1039                 }
1040         }
1041 }
1042
1043 /**
1044  * ad_rx_machine - handle a port's rx State Machine
1045  * @lacpdu: the lacpdu we've received
1046  * @port: the port we're looking at
1047  *
1048  * If lacpdu arrived, stop previous timer (if exists) and set the next state as
1049  * CURRENT. If timer expired set the state machine in the proper state.
1050  * In other cases, this function checks if we need to switch to other state.
1051  */
1052 static void ad_rx_machine(struct lacpdu *lacpdu, struct port *port)
1053 {
1054         rx_states_t last_state;
1055
1056         // Lock to prevent 2 instances of this function to run simultaneously(rx interrupt and periodic machine callback)
1057         __get_rx_machine_lock(port);
1058
1059         // keep current State Machine state to compare later if it was changed
1060         last_state = port->sm_rx_state;
1061
1062         // check if state machine should change state
1063         // first, check if port was reinitialized
1064         if (port->sm_vars & AD_PORT_BEGIN) {
1065                 port->sm_rx_state = AD_RX_INITIALIZE;               // next state
1066         }
1067         // check if port is not enabled
1068         else if (!(port->sm_vars & AD_PORT_BEGIN) && !port->is_enabled && !(port->sm_vars & AD_PORT_MOVED)) {
1069                 port->sm_rx_state = AD_RX_PORT_DISABLED;            // next state
1070         }
1071         // check if new lacpdu arrived
1072         else if (lacpdu && ((port->sm_rx_state == AD_RX_EXPIRED) || (port->sm_rx_state == AD_RX_DEFAULTED) || (port->sm_rx_state == AD_RX_CURRENT))) {
1073                 port->sm_rx_timer_counter = 0; // zero timer
1074                 port->sm_rx_state = AD_RX_CURRENT;
1075         } else {
1076                 // if timer is on, and if it is expired
1077                 if (port->sm_rx_timer_counter && !(--port->sm_rx_timer_counter)) {
1078                         switch (port->sm_rx_state) {
1079                         case AD_RX_EXPIRED:
1080                                 port->sm_rx_state = AD_RX_DEFAULTED;            // next state
1081                                 break;
1082                         case AD_RX_CURRENT:
1083                                 port->sm_rx_state = AD_RX_EXPIRED;          // next state
1084                                 break;
1085                         default:    //to silence the compiler
1086                                 break;
1087                         }
1088                 } else {
1089                         // if no lacpdu arrived and no timer is on
1090                         switch (port->sm_rx_state) {
1091                         case AD_RX_PORT_DISABLED:
1092                                 if (port->sm_vars & AD_PORT_MOVED) {
1093                                         port->sm_rx_state = AD_RX_INITIALIZE;       // next state
1094                                 } else if (port->is_enabled && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1095                                         port->sm_rx_state = AD_RX_EXPIRED;      // next state
1096                                 } else if (port->is_enabled && ((port->sm_vars & AD_PORT_LACP_ENABLED) == 0)) {
1097                                         port->sm_rx_state = AD_RX_LACP_DISABLED;    // next state
1098                                 }
1099                                 break;
1100                         default:    //to silence the compiler
1101                                 break;
1102
1103                         }
1104                 }
1105         }
1106
1107         // check if the State machine was changed or new lacpdu arrived
1108         if ((port->sm_rx_state != last_state) || (lacpdu)) {
1109                 dprintk("Rx Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_rx_state);
1110                 switch (port->sm_rx_state) {
1111                 case AD_RX_INITIALIZE:
1112                         if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1113                                 port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1114                         } else {
1115                                 port->sm_vars |= AD_PORT_LACP_ENABLED;
1116                         }
1117                         port->sm_vars &= ~AD_PORT_SELECTED;
1118                         __record_default(port);
1119                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1120                         port->sm_vars &= ~AD_PORT_MOVED;
1121                         port->sm_rx_state = AD_RX_PORT_DISABLED;        // next state
1122
1123                         /*- Fall Through -*/
1124
1125                 case AD_RX_PORT_DISABLED:
1126                         port->sm_vars &= ~AD_PORT_MATCHED;
1127                         break;
1128                 case AD_RX_LACP_DISABLED:
1129                         port->sm_vars &= ~AD_PORT_SELECTED;
1130                         __record_default(port);
1131                         port->partner_oper_port_state &= ~AD_STATE_AGGREGATION;
1132                         port->sm_vars |= AD_PORT_MATCHED;
1133                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1134                         break;
1135                 case AD_RX_EXPIRED:
1136                         //Reset of the Synchronization flag. (Standard 43.4.12)
1137                         //This reset cause to disable this port in the COLLECTING_DISTRIBUTING state of the
1138                         //mux machine in case of EXPIRED even if LINK_DOWN didn't arrive for the port.
1139                         port->partner_oper_port_state &= ~AD_STATE_SYNCHRONIZATION;
1140                         port->sm_vars &= ~AD_PORT_MATCHED;
1141                         port->partner_oper_port_state |= AD_SHORT_TIMEOUT;
1142                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(AD_SHORT_TIMEOUT));
1143                         port->actor_oper_port_state |= AD_STATE_EXPIRED;
1144                         break;
1145                 case AD_RX_DEFAULTED:
1146                         __update_default_selected(port);
1147                         __record_default(port);
1148                         port->sm_vars |= AD_PORT_MATCHED;
1149                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1150                         break;
1151                 case AD_RX_CURRENT:
1152                         // detect loopback situation
1153                         if (!MAC_ADDRESS_COMPARE(&(lacpdu->actor_system), &(port->actor_system))) {
1154                                 // INFO_RECEIVED_LOOPBACK_FRAMES
1155                                 printk(KERN_ERR DRV_NAME ": %s: An illegal loopback occurred on "
1156                                        "adapter (%s). Check the configuration to verify that all "
1157                                        "Adapters are connected to 802.3ad compliant switch ports\n",
1158                                        port->slave->dev->master->name, port->slave->dev->name);
1159                                 __release_rx_machine_lock(port);
1160                                 return;
1161                         }
1162                         __update_selected(lacpdu, port);
1163                         __update_ntt(lacpdu, port);
1164                         __record_pdu(lacpdu, port);
1165                         __choose_matched(lacpdu, port);
1166                         port->sm_rx_timer_counter = __ad_timer_to_ticks(AD_CURRENT_WHILE_TIMER, (u16)(port->actor_oper_port_state & AD_STATE_LACP_TIMEOUT));
1167                         port->actor_oper_port_state &= ~AD_STATE_EXPIRED;
1168                         // verify that if the aggregator is enabled, the port is enabled too.
1169                         //(because if the link goes down for a short time, the 802.3ad will not
1170                         // catch it, and the port will continue to be disabled)
1171                         if (port->aggregator && port->aggregator->is_active && !__port_is_enabled(port)) {
1172                                 __enable_port(port);
1173                         }
1174                         break;
1175                 default:    //to silence the compiler
1176                         break;
1177                 }
1178         }
1179         __release_rx_machine_lock(port);
1180 }
1181
1182 /**
1183  * ad_tx_machine - handle a port's tx state machine
1184  * @port: the port we're looking at
1185  *
1186  */
1187 static void ad_tx_machine(struct port *port)
1188 {
1189         // check if tx timer expired, to verify that we do not send more than 3 packets per second
1190         if (port->sm_tx_timer_counter && !(--port->sm_tx_timer_counter)) {
1191                 // check if there is something to send
1192                 if (port->ntt && (port->sm_vars & AD_PORT_LACP_ENABLED)) {
1193                         __update_lacpdu_from_port(port);
1194                         // send the lacpdu
1195                         if (ad_lacpdu_send(port) >= 0) {
1196                                 dprintk("Sent LACPDU on port %d\n", port->actor_port_number);
1197                                 // mark ntt as false, so it will not be sent again until demanded
1198                                 port->ntt = 0;
1199                         }
1200                 }
1201                 // restart tx timer(to verify that we will not exceed AD_MAX_TX_IN_SECOND
1202                 port->sm_tx_timer_counter=ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1203         }
1204 }
1205
1206 /**
1207  * ad_periodic_machine - handle a port's periodic state machine
1208  * @port: the port we're looking at
1209  *
1210  * Turn ntt flag on priodically to perform periodic transmission of lacpdu's.
1211  */
1212 static void ad_periodic_machine(struct port *port)
1213 {
1214         periodic_states_t last_state;
1215
1216         // keep current state machine state to compare later if it was changed
1217         last_state = port->sm_periodic_state;
1218
1219         // check if port was reinitialized
1220         if (((port->sm_vars & AD_PORT_BEGIN) || !(port->sm_vars & AD_PORT_LACP_ENABLED) || !port->is_enabled) ||
1221             (!(port->actor_oper_port_state & AD_STATE_LACP_ACTIVITY) && !(port->partner_oper_port_state & AD_STATE_LACP_ACTIVITY))
1222            ) {
1223                 port->sm_periodic_state = AD_NO_PERIODIC;            // next state
1224         }
1225         // check if state machine should change state
1226         else if (port->sm_periodic_timer_counter) {
1227                 // check if periodic state machine expired
1228                 if (!(--port->sm_periodic_timer_counter)) {
1229                         // if expired then do tx
1230                         port->sm_periodic_state = AD_PERIODIC_TX;    // next state
1231                 } else {
1232                         // If not expired, check if there is some new timeout parameter from the partner state
1233                         switch (port->sm_periodic_state) {
1234                         case AD_FAST_PERIODIC:
1235                                 if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1236                                         port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1237                                 }
1238                                 break;
1239                         case AD_SLOW_PERIODIC:
1240                                 if ((port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1241                                         // stop current timer
1242                                         port->sm_periodic_timer_counter = 0;
1243                                         port->sm_periodic_state = AD_PERIODIC_TX;        // next state
1244                                 }
1245                                 break;
1246                         default:    //to silence the compiler
1247                                 break;
1248                         }
1249                 }
1250         } else {
1251                 switch (port->sm_periodic_state) {
1252                 case AD_NO_PERIODIC:
1253                         port->sm_periodic_state = AD_FAST_PERIODIC;      // next state
1254                         break;
1255                 case AD_PERIODIC_TX:
1256                         if (!(port->partner_oper_port_state & AD_STATE_LACP_TIMEOUT)) {
1257                                 port->sm_periodic_state = AD_SLOW_PERIODIC;  // next state
1258                         } else {
1259                                 port->sm_periodic_state = AD_FAST_PERIODIC;  // next state
1260                         }
1261                         break;
1262                 default:    //to silence the compiler
1263                         break;
1264                 }
1265         }
1266
1267         // check if the state machine was changed
1268         if (port->sm_periodic_state != last_state) {
1269                 dprintk("Periodic Machine: Port=%d, Last State=%d, Curr State=%d\n", port->actor_port_number, last_state, port->sm_periodic_state);
1270                 switch (port->sm_periodic_state) {
1271                 case AD_NO_PERIODIC:
1272                         port->sm_periodic_timer_counter = 0;       // zero timer
1273                         break;
1274                 case AD_FAST_PERIODIC:
1275                         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
1276                         break;
1277                 case AD_SLOW_PERIODIC:
1278                         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
1279                         break;
1280                 case AD_PERIODIC_TX:
1281                         port->ntt = 1;
1282                         break;
1283                 default:    //to silence the compiler
1284                         break;
1285                 }
1286         }
1287 }
1288
1289 /**
1290  * ad_port_selection_logic - select aggregation groups
1291  * @port: the port we're looking at
1292  *
1293  * Select aggregation groups, and assign each port for it's aggregetor. The
1294  * selection logic is called in the inititalization (after all the handshkes),
1295  * and after every lacpdu receive (if selected is off).
1296  */
1297 static void ad_port_selection_logic(struct port *port)
1298 {
1299         struct aggregator *aggregator, *free_aggregator = NULL, *temp_aggregator;
1300         struct port *last_port = NULL, *curr_port;
1301         int found = 0;
1302
1303         // if the port is already Selected, do nothing
1304         if (port->sm_vars & AD_PORT_SELECTED) {
1305                 return;
1306         }
1307
1308         // if the port is connected to other aggregator, detach it
1309         if (port->aggregator) {
1310                 // detach the port from its former aggregator
1311                 temp_aggregator=port->aggregator;
1312                 for (curr_port=temp_aggregator->lag_ports; curr_port; last_port=curr_port, curr_port=curr_port->next_port_in_aggregator) {
1313                         if (curr_port == port) {
1314                                 temp_aggregator->num_of_ports--;
1315                                 if (!last_port) {// if it is the first port attached to the aggregator
1316                                         temp_aggregator->lag_ports=port->next_port_in_aggregator;
1317                                 } else {// not the first port attached to the aggregator
1318                                         last_port->next_port_in_aggregator=port->next_port_in_aggregator;
1319                                 }
1320
1321                                 // clear the port's relations to this aggregator
1322                                 port->aggregator = NULL;
1323                                 port->next_port_in_aggregator=NULL;
1324                                 port->actor_port_aggregator_identifier=0;
1325
1326                                 dprintk("Port %d left LAG %d\n", port->actor_port_number, temp_aggregator->aggregator_identifier);
1327                                 // if the aggregator is empty, clear its parameters, and set it ready to be attached
1328                                 if (!temp_aggregator->lag_ports) {
1329                                         ad_clear_agg(temp_aggregator);
1330                                 }
1331                                 break;
1332                         }
1333                 }
1334                 if (!curr_port) { // meaning: the port was related to an aggregator but was not on the aggregator port list
1335                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Port %d (on %s) was "
1336                                "related to aggregator %d but was not on its port list\n",
1337                                port->slave->dev->master->name,
1338                                port->actor_port_number, port->slave->dev->name,
1339                                port->aggregator->aggregator_identifier);
1340                 }
1341         }
1342         // search on all aggregators for a suitable aggregator for this port
1343         for (aggregator = __get_first_agg(port); aggregator;
1344              aggregator = __get_next_agg(aggregator)) {
1345
1346                 // keep a free aggregator for later use(if needed)
1347                 if (!aggregator->lag_ports) {
1348                         if (!free_aggregator) {
1349                                 free_aggregator=aggregator;
1350                         }
1351                         continue;
1352                 }
1353                 // check if current aggregator suits us
1354                 if (((aggregator->actor_oper_aggregator_key == port->actor_oper_port_key) && // if all parameters match AND
1355                      !MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(port->partner_oper_system)) &&
1356                      (aggregator->partner_system_priority == port->partner_oper_system_priority) &&
1357                      (aggregator->partner_oper_aggregator_key == port->partner_oper_key)
1358                     ) &&
1359                     ((MAC_ADDRESS_COMPARE(&(port->partner_oper_system), &(null_mac_addr)) && // partner answers
1360                       !aggregator->is_individual)  // but is not individual OR
1361                     )
1362                    ) {
1363                         // attach to the founded aggregator
1364                         port->aggregator = aggregator;
1365                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1366                         port->next_port_in_aggregator=aggregator->lag_ports;
1367                         port->aggregator->num_of_ports++;
1368                         aggregator->lag_ports=port;
1369                         dprintk("Port %d joined LAG %d(existing LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1370
1371                         // mark this port as selected
1372                         port->sm_vars |= AD_PORT_SELECTED;
1373                         found = 1;
1374                         break;
1375                 }
1376         }
1377
1378         // the port couldn't find an aggregator - attach it to a new aggregator
1379         if (!found) {
1380                 if (free_aggregator) {
1381                         // assign port a new aggregator
1382                         port->aggregator = free_aggregator;
1383                         port->actor_port_aggregator_identifier=port->aggregator->aggregator_identifier;
1384
1385                         // update the new aggregator's parameters
1386                         // if port was responsed from the end-user
1387                         if (port->actor_oper_port_key & AD_DUPLEX_KEY_BITS) {// if port is full duplex
1388                                 port->aggregator->is_individual = 0;
1389                         } else {
1390                                 port->aggregator->is_individual = 1;
1391                         }
1392
1393                         port->aggregator->actor_admin_aggregator_key = port->actor_admin_port_key;
1394                         port->aggregator->actor_oper_aggregator_key = port->actor_oper_port_key;
1395                         port->aggregator->partner_system=port->partner_oper_system;
1396                         port->aggregator->partner_system_priority = port->partner_oper_system_priority;
1397                         port->aggregator->partner_oper_aggregator_key = port->partner_oper_key;
1398                         port->aggregator->receive_state = 1;
1399                         port->aggregator->transmit_state = 1;
1400                         port->aggregator->lag_ports = port;
1401                         port->aggregator->num_of_ports++;
1402
1403                         // mark this port as selected
1404                         port->sm_vars |= AD_PORT_SELECTED;
1405
1406                         dprintk("Port %d joined LAG %d(new LAG)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1407                 } else {
1408                         printk(KERN_ERR DRV_NAME ": %s: Port %d (on %s) did not find a suitable aggregator\n",
1409                                port->slave->dev->master->name,
1410                                port->actor_port_number, port->slave->dev->name);
1411                 }
1412         }
1413         // if all aggregator's ports are READY_N == TRUE, set ready=TRUE in all aggregator's ports
1414         // else set ready=FALSE in all aggregator's ports
1415         __set_agg_ports_ready(port->aggregator, __agg_ports_are_ready(port->aggregator));
1416
1417         if (!__check_agg_selection_timer(port) && (aggregator = __get_first_agg(port))) {
1418                 ad_agg_selection_logic(aggregator);
1419         }
1420 }
1421
1422 /**
1423  * ad_agg_selection_logic - select an aggregation group for a team
1424  * @aggregator: the aggregator we're looking at
1425  *
1426  * It is assumed that only one aggregator may be selected for a team.
1427  * The logic of this function is to select (at first time) the aggregator with
1428  * the most ports attached to it, and to reselect the active aggregator only if
1429  * the previous aggregator has no more ports related to it.
1430  *
1431  * FIXME: this function MUST be called with the first agg in the bond, or
1432  * __get_active_agg() won't work correctly. This function should be better
1433  * called with the bond itself, and retrieve the first agg from it.
1434  */
1435 static void ad_agg_selection_logic(struct aggregator *aggregator)
1436 {
1437         struct aggregator *best_aggregator = NULL, *active_aggregator = NULL;
1438         struct aggregator *last_active_aggregator = NULL, *origin_aggregator;
1439         struct port *port;
1440         u16 num_of_aggs=0;
1441
1442         origin_aggregator = aggregator;
1443
1444         //get current active aggregator
1445         last_active_aggregator = __get_active_agg(aggregator);
1446
1447         // search for the aggregator with the most ports attached to it.
1448         do {
1449                 // count how many candidate lag's we have
1450                 if (aggregator->lag_ports) {
1451                         num_of_aggs++;
1452                 }
1453                 if (aggregator->is_active && !aggregator->is_individual &&   // if current aggregator is the active aggregator
1454                     MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr))) {   // and partner answers to 802.3ad PDUs
1455                         if (aggregator->num_of_ports) { // if any ports attached to the current aggregator
1456                                 best_aggregator=NULL;    // disregard the best aggregator that was chosen by now
1457                                 break;           // stop the selection of other aggregator if there are any ports attached to this active aggregator
1458                         } else { // no ports attached to this active aggregator
1459                                 aggregator->is_active = 0; // mark this aggregator as not active anymore
1460                         }
1461                 }
1462                 if (aggregator->num_of_ports) { // if any ports attached
1463                         if (best_aggregator) {  // if there is a candidte aggregator
1464                                 //The reasons for choosing new best aggregator:
1465                                 // 1. if current agg is NOT individual and the best agg chosen so far is individual OR
1466                                 // current and best aggs are both individual or both not individual, AND
1467                                 // 2a.  current agg partner reply but best agg partner do not reply OR
1468                                 // 2b.  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply AND
1469                                 //      current has more ports/bandwidth, or same amount of ports but current has faster ports, THEN
1470                                 //      current agg become best agg so far
1471
1472                                 //if current agg is NOT individual and the best agg chosen so far is individual change best_aggregator
1473                                 if (!aggregator->is_individual && best_aggregator->is_individual) {
1474                                         best_aggregator=aggregator;
1475                                 }
1476                                 // current and best aggs are both individual or both not individual
1477                                 else if ((aggregator->is_individual && best_aggregator->is_individual) ||
1478                                          (!aggregator->is_individual && !best_aggregator->is_individual)) {
1479                                         //  current and best aggs are both individual or both not individual AND
1480                                         //  current agg partner reply but best agg partner do not reply
1481                                         if ((MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1482                                              !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1483                                                 best_aggregator=aggregator;
1484                                         }
1485                                         //  current agg partner reply OR current agg partner do not reply AND best agg partner also do not reply
1486                                         else if (! (!MAC_ADDRESS_COMPARE(&(aggregator->partner_system), &(null_mac_addr)) &&
1487                                                     MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr)))) {
1488                                                 if ((__get_agg_selection_mode(aggregator->lag_ports) == AD_BANDWIDTH)&&
1489                                                     (__get_agg_bandwidth(aggregator) > __get_agg_bandwidth(best_aggregator))) {
1490                                                         best_aggregator=aggregator;
1491                                                 } else if (__get_agg_selection_mode(aggregator->lag_ports) == AD_COUNT) {
1492                                                         if (((aggregator->num_of_ports > best_aggregator->num_of_ports) &&
1493                                                              (aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS))||
1494                                                             ((aggregator->num_of_ports == best_aggregator->num_of_ports) &&
1495                                                              ((u16)(aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS) >
1496                                                               (u16)(best_aggregator->actor_oper_aggregator_key & AD_SPEED_KEY_BITS)))) {
1497                                                                 best_aggregator=aggregator;
1498                                                         }
1499                                                 }
1500                                         }
1501                                 }
1502                         } else {
1503                                 best_aggregator=aggregator;
1504                         }
1505                 }
1506                 aggregator->is_active = 0; // mark all aggregators as not active anymore
1507         } while ((aggregator = __get_next_agg(aggregator)));
1508
1509         // if we have new aggregator selected, don't replace the old aggregator if it has an answering partner,
1510         // or if both old aggregator and new aggregator don't have answering partner
1511         if (best_aggregator) {
1512                 if (last_active_aggregator && last_active_aggregator->lag_ports && last_active_aggregator->lag_ports->is_enabled &&
1513                     (MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) ||   // partner answers OR
1514                      (!MAC_ADDRESS_COMPARE(&(last_active_aggregator->partner_system), &(null_mac_addr)) &&      // both old and new
1515                       !MAC_ADDRESS_COMPARE(&(best_aggregator->partner_system), &(null_mac_addr))))     // partner do not answer
1516                    ) {
1517                         // if new aggregator has link, and old aggregator does not, replace old aggregator.(do nothing)
1518                         // -> don't replace otherwise.
1519                         if (!(!last_active_aggregator->actor_oper_aggregator_key && best_aggregator->actor_oper_aggregator_key)) {
1520                                 best_aggregator=NULL;
1521                                 last_active_aggregator->is_active = 1; // don't replace good old aggregator
1522
1523                         }
1524                 }
1525         }
1526
1527         // if there is new best aggregator, activate it
1528         if (best_aggregator) {
1529                 for (aggregator = __get_first_agg(best_aggregator->lag_ports);
1530                     aggregator;
1531                     aggregator = __get_next_agg(aggregator)) {
1532
1533                         dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1534                                         aggregator->aggregator_identifier, aggregator->num_of_ports,
1535                                         aggregator->actor_oper_aggregator_key, aggregator->partner_oper_aggregator_key,
1536                                         aggregator->is_individual, aggregator->is_active);
1537                 }
1538
1539                 // check if any partner replys
1540                 if (best_aggregator->is_individual) {
1541                         printk(KERN_WARNING DRV_NAME ": %s: Warning: No 802.3ad response from "
1542                                "the link partner for any adapters in the bond\n",
1543                                best_aggregator->slave->dev->master->name);
1544                 }
1545
1546                 // check if there are more than one aggregator
1547                 if (num_of_aggs > 1) {
1548                         dprintk("Warning: More than one Link Aggregation Group was "
1549                                 "found in the bond. Only one group will function in the bond\n");
1550                 }
1551
1552                 best_aggregator->is_active = 1;
1553                 dprintk("LAG %d choosed as the active LAG\n", best_aggregator->aggregator_identifier);
1554                 dprintk("Agg=%d; Ports=%d; a key=%d; p key=%d; Indiv=%d; Active=%d\n",
1555                                 best_aggregator->aggregator_identifier, best_aggregator->num_of_ports,
1556                                 best_aggregator->actor_oper_aggregator_key, best_aggregator->partner_oper_aggregator_key,
1557                                 best_aggregator->is_individual, best_aggregator->is_active);
1558
1559                 // disable the ports that were related to the former active_aggregator
1560                 if (last_active_aggregator) {
1561                         for (port=last_active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1562                                 __disable_port(port);
1563                         }
1564                 }
1565         }
1566
1567         // if the selected aggregator is of join individuals(partner_system is NULL), enable their ports
1568         active_aggregator = __get_active_agg(origin_aggregator);
1569
1570         if (active_aggregator) {
1571                 if (!MAC_ADDRESS_COMPARE(&(active_aggregator->partner_system), &(null_mac_addr))) {
1572                         for (port=active_aggregator->lag_ports; port; port=port->next_port_in_aggregator) {
1573                                 __enable_port(port);
1574                         }
1575                 }
1576         }
1577 }
1578
1579 /**
1580  * ad_clear_agg - clear a given aggregator's parameters
1581  * @aggregator: the aggregator we're looking at
1582  *
1583  */
1584 static void ad_clear_agg(struct aggregator *aggregator)
1585 {
1586         if (aggregator) {
1587                 aggregator->is_individual = 0;
1588                 aggregator->actor_admin_aggregator_key = 0;
1589                 aggregator->actor_oper_aggregator_key = 0;
1590                 aggregator->partner_system = null_mac_addr;
1591                 aggregator->partner_system_priority = 0;
1592                 aggregator->partner_oper_aggregator_key = 0;
1593                 aggregator->receive_state = 0;
1594                 aggregator->transmit_state = 0;
1595                 aggregator->lag_ports = NULL;
1596                 aggregator->is_active = 0;
1597                 aggregator->num_of_ports = 0;
1598                 dprintk("LAG %d was cleared\n", aggregator->aggregator_identifier);
1599         }
1600 }
1601
1602 /**
1603  * ad_initialize_agg - initialize a given aggregator's parameters
1604  * @aggregator: the aggregator we're looking at
1605  *
1606  */
1607 static void ad_initialize_agg(struct aggregator *aggregator)
1608 {
1609         if (aggregator) {
1610                 ad_clear_agg(aggregator);
1611
1612                 aggregator->aggregator_mac_address = null_mac_addr;
1613                 aggregator->aggregator_identifier = 0;
1614                 aggregator->slave = NULL;
1615         }
1616 }
1617
1618 /**
1619  * ad_initialize_port - initialize a given port's parameters
1620  * @aggregator: the aggregator we're looking at
1621  * @lacp_fast: boolean. whether fast periodic should be used
1622  *
1623  */
1624 static void ad_initialize_port(struct port *port, int lacp_fast)
1625 {
1626         if (port) {
1627                 port->actor_port_number = 1;
1628                 port->actor_port_priority = 0xff;
1629                 port->actor_system = null_mac_addr;
1630                 port->actor_system_priority = 0xffff;
1631                 port->actor_port_aggregator_identifier = 0;
1632                 port->ntt = 0;
1633                 port->actor_admin_port_key = 1;
1634                 port->actor_oper_port_key  = 1;
1635                 port->actor_admin_port_state = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1636                 port->actor_oper_port_state  = AD_STATE_AGGREGATION | AD_STATE_LACP_ACTIVITY;
1637
1638                 if (lacp_fast) {
1639                         port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT;
1640                 }
1641
1642                 port->partner_admin_system = null_mac_addr;
1643                 port->partner_oper_system  = null_mac_addr;
1644                 port->partner_admin_system_priority = 0xffff;
1645                 port->partner_oper_system_priority  = 0xffff;
1646                 port->partner_admin_key = 1;
1647                 port->partner_oper_key  = 1;
1648                 port->partner_admin_port_number = 1;
1649                 port->partner_oper_port_number  = 1;
1650                 port->partner_admin_port_priority = 0xff;
1651                 port->partner_oper_port_priority  = 0xff;
1652                 port->partner_admin_port_state = 1;
1653                 port->partner_oper_port_state  = 1;
1654                 port->is_enabled = 1;
1655                 // ****** private parameters ******
1656                 port->sm_vars = 0x3;
1657                 port->sm_rx_state = 0;
1658                 port->sm_rx_timer_counter = 0;
1659                 port->sm_periodic_state = 0;
1660                 port->sm_periodic_timer_counter = 0;
1661                 port->sm_mux_state = 0;
1662                 port->sm_mux_timer_counter = 0;
1663                 port->sm_tx_state = 0;
1664                 port->sm_tx_timer_counter = 0;
1665                 port->slave = NULL;
1666                 port->aggregator = NULL;
1667                 port->next_port_in_aggregator = NULL;
1668                 port->transaction_id = 0;
1669
1670                 ad_initialize_lacpdu(&(port->lacpdu));
1671         }
1672 }
1673
1674 /**
1675  * ad_enable_collecting_distributing - enable a port's transmit/receive
1676  * @port: the port we're looking at
1677  *
1678  * Enable @port if it's in an active aggregator
1679  */
1680 static void ad_enable_collecting_distributing(struct port *port)
1681 {
1682         if (port->aggregator->is_active) {
1683                 dprintk("Enabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1684                 __enable_port(port);
1685         }
1686 }
1687
1688 /**
1689  * ad_disable_collecting_distributing - disable a port's transmit/receive
1690  * @port: the port we're looking at
1691  *
1692  */
1693 static void ad_disable_collecting_distributing(struct port *port)
1694 {
1695         if (port->aggregator && MAC_ADDRESS_COMPARE(&(port->aggregator->partner_system), &(null_mac_addr))) {
1696                 dprintk("Disabling port %d(LAG %d)\n", port->actor_port_number, port->aggregator->aggregator_identifier);
1697                 __disable_port(port);
1698         }
1699 }
1700
1701 #if 0
1702 /**
1703  * ad_marker_info_send - send a marker information frame
1704  * @port: the port we're looking at
1705  *
1706  * This function does nothing since we decided not to implement send and handle
1707  * response for marker PDU's, in this stage, but only to respond to marker
1708  * information.
1709  */
1710 static void ad_marker_info_send(struct port *port)
1711 {
1712         struct bond_marker marker;
1713         u16 index;
1714
1715         // fill the marker PDU with the appropriate values
1716         marker.subtype = 0x02;
1717         marker.version_number = 0x01;
1718         marker.tlv_type = AD_MARKER_INFORMATION_SUBTYPE;
1719         marker.marker_length = 0x16;
1720         // convert requester_port to Big Endian
1721         marker.requester_port = (((port->actor_port_number & 0xFF) << 8) |((u16)(port->actor_port_number & 0xFF00) >> 8));
1722         marker.requester_system = port->actor_system;
1723         // convert requester_port(u32) to Big Endian
1724         marker.requester_transaction_id = (((++port->transaction_id & 0xFF) << 24) |((port->transaction_id & 0xFF00) << 8) |((port->transaction_id & 0xFF0000) >> 8) |((port->transaction_id & 0xFF000000) >> 24));
1725         marker.pad = 0;
1726         marker.tlv_type_terminator = 0x00;
1727         marker.terminator_length = 0x00;
1728         for (index=0; index<90; index++) {
1729                 marker.reserved_90[index]=0;
1730         }
1731
1732         // send the marker information
1733         if (ad_marker_send(port, &marker) >= 0) {
1734                 dprintk("Sent Marker Information on port %d\n", port->actor_port_number);
1735         }
1736 }
1737 #endif
1738
1739 /**
1740  * ad_marker_info_received - handle receive of a Marker information frame
1741  * @marker_info: Marker info received
1742  * @port: the port we're looking at
1743  *
1744  */
1745 static void ad_marker_info_received(struct bond_marker *marker_info,
1746         struct port *port)
1747 {
1748         struct bond_marker marker;
1749
1750         // copy the received marker data to the response marker
1751         //marker = *marker_info;
1752         memcpy(&marker, marker_info, sizeof(struct bond_marker));
1753         // change the marker subtype to marker response
1754         marker.tlv_type=AD_MARKER_RESPONSE_SUBTYPE;
1755         // send the marker response
1756
1757         if (ad_marker_send(port, &marker) >= 0) {
1758                 dprintk("Sent Marker Response on port %d\n", port->actor_port_number);
1759         }
1760 }
1761
1762 /**
1763  * ad_marker_response_received - handle receive of a marker response frame
1764  * @marker: marker PDU received
1765  * @port: the port we're looking at
1766  *
1767  * This function does nothing since we decided not to implement send and handle
1768  * response for marker PDU's, in this stage, but only to respond to marker
1769  * information.
1770  */
1771 static void ad_marker_response_received(struct bond_marker *marker,
1772         struct port *port)
1773 {
1774         marker=NULL; // just to satisfy the compiler
1775         port=NULL;  // just to satisfy the compiler
1776         // DO NOTHING, SINCE WE DECIDED NOT TO IMPLEMENT THIS FEATURE FOR NOW
1777 }
1778
1779 /**
1780  * ad_initialize_lacpdu - initialize a given lacpdu structure
1781  * @lacpdu: lacpdu structure to initialize
1782  *
1783  */
1784 static void ad_initialize_lacpdu(struct lacpdu *lacpdu)
1785 {
1786         u16 index;
1787
1788         // initialize lacpdu data
1789         lacpdu->subtype = 0x01;
1790         lacpdu->version_number = 0x01;
1791         lacpdu->tlv_type_actor_info = 0x01;
1792         lacpdu->actor_information_length = 0x14;
1793         // lacpdu->actor_system_priority    updated on send
1794         // lacpdu->actor_system             updated on send
1795         // lacpdu->actor_key                updated on send
1796         // lacpdu->actor_port_priority      updated on send
1797         // lacpdu->actor_port               updated on send
1798         // lacpdu->actor_state              updated on send
1799         lacpdu->tlv_type_partner_info = 0x02;
1800         lacpdu->partner_information_length = 0x14;
1801         for (index=0; index<=2; index++) {
1802                 lacpdu->reserved_3_1[index]=0;
1803         }
1804         // lacpdu->partner_system_priority  updated on send
1805         // lacpdu->partner_system           updated on send
1806         // lacpdu->partner_key              updated on send
1807         // lacpdu->partner_port_priority    updated on send
1808         // lacpdu->partner_port             updated on send
1809         // lacpdu->partner_state            updated on send
1810         for (index=0; index<=2; index++) {
1811                 lacpdu->reserved_3_2[index]=0;
1812         }
1813         lacpdu->tlv_type_collector_info = 0x03;
1814         lacpdu->collector_information_length= 0x10;
1815         lacpdu->collector_max_delay = htons(AD_COLLECTOR_MAX_DELAY);
1816         for (index=0; index<=11; index++) {
1817                 lacpdu->reserved_12[index]=0;
1818         }
1819         lacpdu->tlv_type_terminator = 0x00;
1820         lacpdu->terminator_length = 0;
1821         for (index=0; index<=49; index++) {
1822                 lacpdu->reserved_50[index]=0;
1823         }
1824 }
1825
1826 //////////////////////////////////////////////////////////////////////////////////////
1827 // ================= AD exported functions to the main bonding code ==================
1828 //////////////////////////////////////////////////////////////////////////////////////
1829
1830 // Check aggregators status in team every T seconds
1831 #define AD_AGGREGATOR_SELECTION_TIMER  8
1832
1833 static u16 aggregator_identifier;
1834
1835 /**
1836  * bond_3ad_initialize - initialize a bond's 802.3ad parameters and structures
1837  * @bond: bonding struct to work on
1838  * @tick_resolution: tick duration (millisecond resolution)
1839  * @lacp_fast: boolean. whether fast periodic should be used
1840  *
1841  * Can be called only after the mac address of the bond is set.
1842  */
1843 void bond_3ad_initialize(struct bonding *bond, u16 tick_resolution, int lacp_fast)
1844 {                         
1845         // check that the bond is not initialized yet
1846         if (MAC_ADDRESS_COMPARE(&(BOND_AD_INFO(bond).system.sys_mac_addr), &(bond->dev->dev_addr))) {
1847
1848                 aggregator_identifier = 0;
1849
1850                 BOND_AD_INFO(bond).lacp_fast = lacp_fast;
1851                 BOND_AD_INFO(bond).system.sys_priority = 0xFFFF;
1852                 BOND_AD_INFO(bond).system.sys_mac_addr = *((struct mac_addr *)bond->dev->dev_addr);
1853
1854                 // initialize how many times this module is called in one second(should be about every 100ms)
1855                 ad_ticks_per_sec = tick_resolution;
1856
1857                 // initialize the aggregator selection timer(to activate an aggregation selection after initialize)
1858                 BOND_AD_INFO(bond).agg_select_timer = (AD_AGGREGATOR_SELECTION_TIMER * ad_ticks_per_sec);
1859                 BOND_AD_INFO(bond).agg_select_mode = AD_BANDWIDTH;
1860         }
1861 }
1862
1863 /**
1864  * bond_3ad_bind_slave - initialize a slave's port
1865  * @slave: slave struct to work on
1866  *
1867  * Returns:   0 on success
1868  *          < 0 on error
1869  */
1870 int bond_3ad_bind_slave(struct slave *slave)
1871 {
1872         struct bonding *bond = bond_get_bond_by_slave(slave);
1873         struct port *port;
1874         struct aggregator *aggregator;
1875
1876         if (bond == NULL) {
1877                 printk(KERN_ERR DRV_NAME ": %s: The slave %s is not attached to its bond\n",
1878                        slave->dev->master->name, slave->dev->name);
1879                 return -1;
1880         }
1881
1882         //check that the slave has not been intialized yet.
1883         if (SLAVE_AD_INFO(slave).port.slave != slave) {
1884
1885                 // port initialization
1886                 port = &(SLAVE_AD_INFO(slave).port);
1887
1888                 ad_initialize_port(port, BOND_AD_INFO(bond).lacp_fast);
1889
1890                 port->slave = slave;
1891                 port->actor_port_number = SLAVE_AD_INFO(slave).id;
1892                 // key is determined according to the link speed, duplex and user key(which is yet not supported)
1893                 //              ------------------------------------------------------------
1894                 // Port key :   | User key                       |      Speed       |Duplex|
1895                 //              ------------------------------------------------------------
1896                 //              16                               6               1 0
1897                 port->actor_admin_port_key = 0; // initialize this parameter
1898                 port->actor_admin_port_key |= __get_duplex(port);
1899                 port->actor_admin_port_key |= (__get_link_speed(port) << 1);
1900                 port->actor_oper_port_key = port->actor_admin_port_key;
1901                 // if the port is not full duplex, then the port should be not lacp Enabled
1902                 if (!(port->actor_oper_port_key & AD_DUPLEX_KEY_BITS)) {
1903                         port->sm_vars &= ~AD_PORT_LACP_ENABLED;
1904                 }
1905                 // actor system is the bond's system
1906                 port->actor_system = BOND_AD_INFO(bond).system.sys_mac_addr;
1907                 // tx timer(to verify that no more than MAX_TX_IN_SECOND lacpdu's are sent in one second)
1908                 port->sm_tx_timer_counter = ad_ticks_per_sec/AD_MAX_TX_IN_SECOND;
1909                 port->aggregator = NULL;
1910                 port->next_port_in_aggregator = NULL;
1911
1912                 __disable_port(port);
1913                 __initialize_port_locks(port);
1914
1915
1916                 // aggregator initialization
1917                 aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1918
1919                 ad_initialize_agg(aggregator);
1920
1921                 aggregator->aggregator_mac_address = *((struct mac_addr *)bond->dev->dev_addr);
1922                 aggregator->aggregator_identifier = (++aggregator_identifier);
1923                 aggregator->slave = slave;
1924                 aggregator->is_active = 0;
1925                 aggregator->num_of_ports = 0;
1926         }
1927
1928         return 0;
1929 }
1930
1931 /**
1932  * bond_3ad_unbind_slave - deinitialize a slave's port
1933  * @slave: slave struct to work on
1934  *
1935  * Search for the aggregator that is related to this port, remove the
1936  * aggregator and assign another aggregator for other port related to it
1937  * (if any), and remove the port.
1938  */
1939 void bond_3ad_unbind_slave(struct slave *slave)
1940 {
1941         struct port *port, *prev_port, *temp_port;
1942         struct aggregator *aggregator, *new_aggregator, *temp_aggregator;
1943         int select_new_active_agg = 0;
1944         
1945         // find the aggregator related to this slave
1946         aggregator = &(SLAVE_AD_INFO(slave).aggregator);
1947
1948         // find the port related to this slave
1949         port = &(SLAVE_AD_INFO(slave).port);
1950
1951         // if slave is null, the whole port is not initialized
1952         if (!port->slave) {
1953                 printk(KERN_WARNING DRV_NAME ": Warning: %s: Trying to "
1954                        "unbind an uninitialized port on %s\n",
1955                        slave->dev->master->name, slave->dev->name);
1956                 return;
1957         }
1958
1959         dprintk("Unbinding Link Aggregation Group %d\n", aggregator->aggregator_identifier);
1960
1961         /* Tell the partner that this port is not suitable for aggregation */
1962         port->actor_oper_port_state &= ~AD_STATE_AGGREGATION;
1963         __update_lacpdu_from_port(port);
1964         ad_lacpdu_send(port);
1965
1966         // check if this aggregator is occupied
1967         if (aggregator->lag_ports) {
1968                 // check if there are other ports related to this aggregator except
1969                 // the port related to this slave(thats ensure us that there is a
1970                 // reason to search for new aggregator, and that we will find one
1971                 if ((aggregator->lag_ports != port) || (aggregator->lag_ports->next_port_in_aggregator)) {
1972                         // find new aggregator for the related port(s)
1973                         new_aggregator = __get_first_agg(port);
1974                         for (; new_aggregator; new_aggregator = __get_next_agg(new_aggregator)) {
1975                                 // if the new aggregator is empty, or it connected to to our port only
1976                                 if (!new_aggregator->lag_ports || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator)) {
1977                                         break;
1978                                 }
1979                         }
1980                         // if new aggregator found, copy the aggregator's parameters
1981                         // and connect the related lag_ports to the new aggregator
1982                         if ((new_aggregator) && ((!new_aggregator->lag_ports) || ((new_aggregator->lag_ports == port) && !new_aggregator->lag_ports->next_port_in_aggregator))) {
1983                                 dprintk("Some port(s) related to LAG %d - replaceing with LAG %d\n", aggregator->aggregator_identifier, new_aggregator->aggregator_identifier);
1984
1985                                 if ((new_aggregator->lag_ports == port) && new_aggregator->is_active) {
1986                                         printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
1987                                                aggregator->slave->dev->master->name);
1988                                         // select new active aggregator
1989                                          select_new_active_agg = 1;
1990                                 }
1991
1992                                 new_aggregator->is_individual = aggregator->is_individual;
1993                                 new_aggregator->actor_admin_aggregator_key = aggregator->actor_admin_aggregator_key;
1994                                 new_aggregator->actor_oper_aggregator_key = aggregator->actor_oper_aggregator_key;
1995                                 new_aggregator->partner_system = aggregator->partner_system;
1996                                 new_aggregator->partner_system_priority = aggregator->partner_system_priority;
1997                                 new_aggregator->partner_oper_aggregator_key = aggregator->partner_oper_aggregator_key;
1998                                 new_aggregator->receive_state = aggregator->receive_state;
1999                                 new_aggregator->transmit_state = aggregator->transmit_state;
2000                                 new_aggregator->lag_ports = aggregator->lag_ports;
2001                                 new_aggregator->is_active = aggregator->is_active;
2002                                 new_aggregator->num_of_ports = aggregator->num_of_ports;
2003
2004                                 // update the information that is written on the ports about the aggregator
2005                                 for (temp_port=aggregator->lag_ports; temp_port; temp_port=temp_port->next_port_in_aggregator) {
2006                                         temp_port->aggregator=new_aggregator;
2007                                         temp_port->actor_port_aggregator_identifier = new_aggregator->aggregator_identifier;
2008                                 }
2009
2010                                 // clear the aggregator
2011                                 ad_clear_agg(aggregator);
2012                                 
2013                                 if (select_new_active_agg) {
2014                                         ad_agg_selection_logic(__get_first_agg(port));
2015                                 }
2016                         } else {
2017                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: unbinding aggregator, "
2018                                        "and could not find a new aggregator for its ports\n",
2019                                        slave->dev->master->name);
2020                         }
2021                 } else { // in case that the only port related to this aggregator is the one we want to remove
2022                         select_new_active_agg = aggregator->is_active;
2023                         // clear the aggregator
2024                         ad_clear_agg(aggregator);
2025                         if (select_new_active_agg) {
2026                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2027                                        slave->dev->master->name);
2028                                 // select new active aggregator
2029                                 ad_agg_selection_logic(__get_first_agg(port));
2030                         }
2031                 }
2032         }
2033
2034         dprintk("Unbinding port %d\n", port->actor_port_number);
2035         // find the aggregator that this port is connected to
2036         temp_aggregator = __get_first_agg(port);
2037         for (; temp_aggregator; temp_aggregator = __get_next_agg(temp_aggregator)) {
2038                 prev_port = NULL;
2039                 // search the port in the aggregator's related ports
2040                 for (temp_port=temp_aggregator->lag_ports; temp_port; prev_port=temp_port, temp_port=temp_port->next_port_in_aggregator) {
2041                         if (temp_port == port) { // the aggregator found - detach the port from this aggregator
2042                                 if (prev_port) {
2043                                         prev_port->next_port_in_aggregator = temp_port->next_port_in_aggregator;
2044                                 } else {
2045                                         temp_aggregator->lag_ports = temp_port->next_port_in_aggregator;
2046                                 }
2047                                 temp_aggregator->num_of_ports--;
2048                                 if (temp_aggregator->num_of_ports==0) {
2049                                         select_new_active_agg = temp_aggregator->is_active;
2050                                         // clear the aggregator
2051                                         ad_clear_agg(temp_aggregator);
2052                                         if (select_new_active_agg) {
2053                                                 printk(KERN_INFO DRV_NAME ": %s: Removing an active aggregator\n",
2054                                                        slave->dev->master->name);
2055                                                 // select new active aggregator
2056                                                 ad_agg_selection_logic(__get_first_agg(port));
2057                                         }
2058                                 }
2059                                 break;
2060                         }
2061                 }
2062         }
2063         port->slave=NULL;       
2064 }
2065
2066 /**
2067  * bond_3ad_state_machine_handler - handle state machines timeout
2068  * @bond: bonding struct to work on
2069  *
2070  * The state machine handling concept in this module is to check every tick
2071  * which state machine should operate any function. The execution order is
2072  * round robin, so when we have an interaction between state machines, the
2073  * reply of one to each other might be delayed until next tick.
2074  *
2075  * This function also complete the initialization when the agg_select_timer
2076  * times out, and it selects an aggregator for the ports that are yet not
2077  * related to any aggregator, and selects the active aggregator for a bond.
2078  */
2079 void bond_3ad_state_machine_handler(struct work_struct *work)
2080 {
2081         struct bonding *bond = container_of(work, struct bonding,
2082                                             ad_work.work);
2083         struct port *port;
2084         struct aggregator *aggregator;
2085
2086         read_lock(&bond->lock);
2087
2088         if (bond->kill_timers) {
2089                 goto out;
2090         }
2091
2092         //check if there are any slaves
2093         if (bond->slave_cnt == 0) {
2094                 goto re_arm;
2095         }
2096
2097         // check if agg_select_timer timer after initialize is timed out
2098         if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
2099                 // select the active aggregator for the bond
2100                 if ((port = __get_first_port(bond))) {
2101                         if (!port->slave) {
2102                                 printk(KERN_WARNING DRV_NAME ": %s: Warning: bond's first port is "
2103                                        "uninitialized\n", bond->dev->name);
2104                                 goto re_arm;
2105                         }
2106
2107                         aggregator = __get_first_agg(port);
2108                         ad_agg_selection_logic(aggregator);
2109                 }
2110         }
2111
2112         // for each port run the state machines
2113         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2114                 if (!port->slave) {
2115                         printk(KERN_WARNING DRV_NAME ": %s: Warning: Found an uninitialized "
2116                                "port\n", bond->dev->name);
2117                         goto re_arm;
2118                 }
2119
2120                 ad_rx_machine(NULL, port);
2121                 ad_periodic_machine(port);
2122                 ad_port_selection_logic(port);
2123                 ad_mux_machine(port);
2124                 ad_tx_machine(port);
2125
2126                 // turn off the BEGIN bit, since we already handled it
2127                 if (port->sm_vars & AD_PORT_BEGIN) {
2128                         port->sm_vars &= ~AD_PORT_BEGIN;
2129                 }
2130         }
2131
2132 re_arm:
2133         queue_delayed_work(bond->wq, &bond->ad_work, ad_delta_in_ticks);
2134 out:
2135         read_unlock(&bond->lock);
2136 }
2137
2138 /**
2139  * bond_3ad_rx_indication - handle a received frame
2140  * @lacpdu: received lacpdu
2141  * @slave: slave struct to work on
2142  * @length: length of the data received
2143  *
2144  * It is assumed that frames that were sent on this NIC don't returned as new
2145  * received frames (loopback). Since only the payload is given to this
2146  * function, it check for loopback.
2147  */
2148 static void bond_3ad_rx_indication(struct lacpdu *lacpdu, struct slave *slave, u16 length)
2149 {
2150         struct port *port;
2151
2152         if (length >= sizeof(struct lacpdu)) {
2153
2154                 port = &(SLAVE_AD_INFO(slave).port);
2155
2156                 if (!port->slave) {
2157                         printk(KERN_WARNING DRV_NAME ": %s: Warning: port of slave %s is "
2158                                "uninitialized\n", slave->dev->name, slave->dev->master->name);
2159                         return;
2160                 }
2161
2162                 switch (lacpdu->subtype) {
2163                 case AD_TYPE_LACPDU:
2164                         dprintk("Received LACPDU on port %d\n", port->actor_port_number);
2165                         ad_rx_machine(lacpdu, port);
2166                         break;
2167
2168                 case AD_TYPE_MARKER:
2169                         // No need to convert fields to Little Endian since we don't use the marker's fields.
2170
2171                         switch (((struct bond_marker *)lacpdu)->tlv_type) {
2172                         case AD_MARKER_INFORMATION_SUBTYPE:
2173                                 dprintk("Received Marker Information on port %d\n", port->actor_port_number);
2174                                 ad_marker_info_received((struct bond_marker *)lacpdu, port);
2175                                 break;
2176
2177                         case AD_MARKER_RESPONSE_SUBTYPE:
2178                                 dprintk("Received Marker Response on port %d\n", port->actor_port_number);
2179                                 ad_marker_response_received((struct bond_marker *)lacpdu, port);
2180                                 break;
2181
2182                         default:
2183                                 dprintk("Received an unknown Marker subtype on slot %d\n", port->actor_port_number);
2184                         }
2185                 }
2186         }
2187 }
2188
2189 /**
2190  * bond_3ad_adapter_speed_changed - handle a slave's speed change indication
2191  * @slave: slave struct to work on
2192  *
2193  * Handle reselection of aggregator (if needed) for this port.
2194  */
2195 void bond_3ad_adapter_speed_changed(struct slave *slave)
2196 {
2197         struct port *port;
2198
2199         port = &(SLAVE_AD_INFO(slave).port);
2200
2201         // if slave is null, the whole port is not initialized
2202         if (!port->slave) {
2203                 printk(KERN_WARNING DRV_NAME ": Warning: %s: speed "
2204                        "changed for uninitialized port on %s\n",
2205                        slave->dev->master->name, slave->dev->name);
2206                 return;
2207         }
2208
2209         port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2210         port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2211         dprintk("Port %d changed speed\n", port->actor_port_number);
2212         // there is no need to reselect a new aggregator, just signal the
2213         // state machines to reinitialize
2214         port->sm_vars |= AD_PORT_BEGIN;
2215 }
2216
2217 /**
2218  * bond_3ad_adapter_duplex_changed - handle a slave's duplex change indication
2219  * @slave: slave struct to work on
2220  *
2221  * Handle reselection of aggregator (if needed) for this port.
2222  */
2223 void bond_3ad_adapter_duplex_changed(struct slave *slave)
2224 {
2225         struct port *port;
2226
2227         port=&(SLAVE_AD_INFO(slave).port);
2228
2229         // if slave is null, the whole port is not initialized
2230         if (!port->slave) {
2231                 printk(KERN_WARNING DRV_NAME ": %s: Warning: duplex changed "
2232                        "for uninitialized port on %s\n",
2233                        slave->dev->master->name, slave->dev->name);
2234                 return;
2235         }
2236
2237         port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2238         port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2239         dprintk("Port %d changed duplex\n", port->actor_port_number);
2240         // there is no need to reselect a new aggregator, just signal the
2241         // state machines to reinitialize
2242         port->sm_vars |= AD_PORT_BEGIN;
2243 }
2244
2245 /**
2246  * bond_3ad_handle_link_change - handle a slave's link status change indication
2247  * @slave: slave struct to work on
2248  * @status: whether the link is now up or down
2249  *
2250  * Handle reselection of aggregator (if needed) for this port.
2251  */
2252 void bond_3ad_handle_link_change(struct slave *slave, char link)
2253 {
2254         struct port *port;
2255
2256         port = &(SLAVE_AD_INFO(slave).port);
2257
2258         // if slave is null, the whole port is not initialized
2259         if (!port->slave) {
2260                 printk(KERN_WARNING DRV_NAME ": Warning: %s: link status changed for "
2261                        "uninitialized port on %s\n",
2262                         slave->dev->master->name, slave->dev->name);
2263                 return;
2264         }
2265
2266         // 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)
2267         // on link up we are forcing recheck on the duplex and speed since some of he adaptors(ce1000.lan) report
2268         if (link == BOND_LINK_UP) {
2269                 port->is_enabled = 1;
2270                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2271                 port->actor_oper_port_key=port->actor_admin_port_key |= __get_duplex(port);
2272                 port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS;
2273                 port->actor_oper_port_key=port->actor_admin_port_key |= (__get_link_speed(port) << 1);
2274         } else {
2275                 /* link has failed */
2276                 port->is_enabled = 0;
2277                 port->actor_admin_port_key &= ~AD_DUPLEX_KEY_BITS;
2278                 port->actor_oper_port_key= (port->actor_admin_port_key &= ~AD_SPEED_KEY_BITS);
2279         }
2280         //BOND_PRINT_DBG(("Port %d changed link status to %s", port->actor_port_number, ((link == BOND_LINK_UP)?"UP":"DOWN")));
2281         // there is no need to reselect a new aggregator, just signal the
2282         // state machines to reinitialize
2283         port->sm_vars |= AD_PORT_BEGIN;
2284 }
2285
2286 /*
2287  * set link state for bonding master: if we have an active 
2288  * aggregator, we're up, if not, we're down.  Presumes that we cannot
2289  * have an active aggregator if there are no slaves with link up.
2290  *
2291  * This behavior complies with IEEE 802.3 section 43.3.9.
2292  *
2293  * Called by bond_set_carrier(). Return zero if carrier state does not
2294  * change, nonzero if it does.
2295  */
2296 int bond_3ad_set_carrier(struct bonding *bond)
2297 {
2298         if (__get_active_agg(&(SLAVE_AD_INFO(bond->first_slave).aggregator))) {
2299                 if (!netif_carrier_ok(bond->dev)) {
2300                         netif_carrier_on(bond->dev);
2301                         return 1;
2302                 }
2303                 return 0;
2304         }
2305
2306         if (netif_carrier_ok(bond->dev)) {
2307                 netif_carrier_off(bond->dev);
2308                 return 1;
2309         }
2310         return 0;
2311 }
2312
2313 /**
2314  * bond_3ad_get_active_agg_info - get information of the active aggregator
2315  * @bond: bonding struct to work on
2316  * @ad_info: ad_info struct to fill with the bond's info
2317  *
2318  * Returns:   0 on success
2319  *          < 0 on error
2320  */
2321 int bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info)
2322 {
2323         struct aggregator *aggregator = NULL;
2324         struct port *port;
2325
2326         for (port = __get_first_port(bond); port; port = __get_next_port(port)) {
2327                 if (port->aggregator && port->aggregator->is_active) {
2328                         aggregator = port->aggregator;
2329                         break;
2330                 }
2331         }
2332
2333         if (aggregator) {
2334                 ad_info->aggregator_id = aggregator->aggregator_identifier;
2335                 ad_info->ports = aggregator->num_of_ports;
2336                 ad_info->actor_key = aggregator->actor_oper_aggregator_key;
2337                 ad_info->partner_key = aggregator->partner_oper_aggregator_key;
2338                 memcpy(ad_info->partner_system, aggregator->partner_system.mac_addr_value, ETH_ALEN);
2339                 return 0;
2340         }
2341
2342         return -1;
2343 }
2344
2345 int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
2346 {
2347         struct slave *slave, *start_at;
2348         struct bonding *bond = dev->priv;
2349         int slave_agg_no;
2350         int slaves_in_agg;
2351         int agg_id;
2352         int i;
2353         struct ad_info ad_info;
2354         int res = 1;
2355
2356         /* make sure that the slaves list will
2357          * not change during tx
2358          */
2359         read_lock(&bond->lock);
2360
2361         if (!BOND_IS_OK(bond)) {
2362                 goto out;
2363         }
2364
2365         if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
2366                 printk(KERN_DEBUG DRV_NAME ": %s: Error: "
2367                        "bond_3ad_get_active_agg_info failed\n", dev->name);
2368                 goto out;
2369         }
2370
2371         slaves_in_agg = ad_info.ports;
2372         agg_id = ad_info.aggregator_id;
2373
2374         if (slaves_in_agg == 0) {
2375                 /*the aggregator is empty*/
2376                 printk(KERN_DEBUG DRV_NAME ": %s: Error: active "
2377                        "aggregator is empty\n",
2378                        dev->name);
2379                 goto out;
2380         }
2381
2382         slave_agg_no = bond->xmit_hash_policy(skb, dev, slaves_in_agg);
2383
2384         bond_for_each_slave(bond, slave, i) {
2385                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2386
2387                 if (agg && (agg->aggregator_identifier == agg_id)) {
2388                         slave_agg_no--;
2389                         if (slave_agg_no < 0) {
2390                                 break;
2391                         }
2392                 }
2393         }
2394
2395         if (slave_agg_no >= 0) {
2396                 printk(KERN_ERR DRV_NAME ": %s: Error: Couldn't find a slave to tx on "
2397                        "for aggregator ID %d\n", dev->name, agg_id);
2398                 goto out;
2399         }
2400
2401         start_at = slave;
2402
2403         bond_for_each_slave_from(bond, slave, i, start_at) {
2404                 int slave_agg_id = 0;
2405                 struct aggregator *agg = SLAVE_AD_INFO(slave).port.aggregator;
2406
2407                 if (agg) {
2408                         slave_agg_id = agg->aggregator_identifier;
2409                 }
2410
2411                 if (SLAVE_IS_OK(slave) && agg && (slave_agg_id == agg_id)) {
2412                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
2413                         break;
2414                 }
2415         }
2416
2417 out:
2418         if (res) {
2419                 /* no suitable interface, frame not sent */
2420                 dev_kfree_skb(skb);
2421         }
2422         read_unlock(&bond->lock);
2423         return 0;
2424 }
2425
2426 int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type* ptype, struct net_device *orig_dev)
2427 {
2428         struct bonding *bond = dev->priv;
2429         struct slave *slave = NULL;
2430         int ret = NET_RX_DROP;
2431
2432         if (dev_net(dev) != &init_net)
2433                 goto out;
2434
2435         if (!(dev->flags & IFF_MASTER))
2436                 goto out;
2437
2438         read_lock(&bond->lock);
2439         slave = bond_get_slave_by_dev((struct bonding *)dev->priv, orig_dev);
2440         if (!slave)
2441                 goto out_unlock;
2442
2443         bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);
2444
2445         ret = NET_RX_SUCCESS;
2446
2447 out_unlock:
2448         read_unlock(&bond->lock);
2449 out:
2450         dev_kfree_skb(skb);
2451
2452         return ret;
2453 }
2454