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1/******************************************************************************
2 *
3 * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
4 *
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20 *
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *
28 *****************************************************************************/
29
30#include <net/mac80211.h>
31#include <linux/etherdevice.h>
32#include <linux/sched.h>
33#include <linux/lockdep.h>
34
35#include "iwl-dev.h"
36#include "iwl-core.h"
37#include "iwl-sta.h"
38
39/* priv->sta_lock must be held */
40static void iwl_legacy_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
41{
42
43 if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
44 IWL_ERR(priv,
45 "ACTIVATE a non DRIVER active station id %u addr %pM\n",
46 sta_id, priv->stations[sta_id].sta.sta.addr);
47
48 if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
49 IWL_DEBUG_ASSOC(priv,
50 "STA id %u addr %pM already present"
51 " in uCode (according to driver)\n",
52 sta_id, priv->stations[sta_id].sta.sta.addr);
53 } else {
54 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
55 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
56 sta_id, priv->stations[sta_id].sta.sta.addr);
57 }
58}
59
60static int iwl_legacy_process_add_sta_resp(struct iwl_priv *priv,
61 struct iwl_legacy_addsta_cmd *addsta,
62 struct iwl_rx_packet *pkt,
63 bool sync)
64{
65 u8 sta_id = addsta->sta.sta_id;
66 unsigned long flags;
67 int ret = -EIO;
68
69 if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
70 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
71 pkt->hdr.flags);
72 return ret;
73 }
74
75 IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
76 sta_id);
77
78 spin_lock_irqsave(&priv->sta_lock, flags);
79
80 switch (pkt->u.add_sta.status) {
81 case ADD_STA_SUCCESS_MSK:
82 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
83 iwl_legacy_sta_ucode_activate(priv, sta_id);
84 ret = 0;
85 break;
86 case ADD_STA_NO_ROOM_IN_TABLE:
87 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
88 sta_id);
89 break;
90 case ADD_STA_NO_BLOCK_ACK_RESOURCE:
91 IWL_ERR(priv,
92 "Adding station %d failed, no block ack resource.\n",
93 sta_id);
94 break;
95 case ADD_STA_MODIFY_NON_EXIST_STA:
96 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
97 sta_id);
98 break;
99 default:
100 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
101 pkt->u.add_sta.status);
102 break;
103 }
104
105 IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
106 priv->stations[sta_id].sta.mode ==
107 STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
108 sta_id, priv->stations[sta_id].sta.sta.addr);
109
110 /*
111 * XXX: The MAC address in the command buffer is often changed from
112 * the original sent to the device. That is, the MAC address
113 * written to the command buffer often is not the same MAC address
114 * read from the command buffer when the command returns. This
115 * issue has not yet been resolved and this debugging is left to
116 * observe the problem.
117 */
118 IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
119 priv->stations[sta_id].sta.mode ==
120 STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
121 addsta->sta.addr);
122 spin_unlock_irqrestore(&priv->sta_lock, flags);
123
124 return ret;
125}
126
127static void iwl_legacy_add_sta_callback(struct iwl_priv *priv,
128 struct iwl_device_cmd *cmd,
129 struct iwl_rx_packet *pkt)
130{
131 struct iwl_legacy_addsta_cmd *addsta =
132 (struct iwl_legacy_addsta_cmd *)cmd->cmd.payload;
133
134 iwl_legacy_process_add_sta_resp(priv, addsta, pkt, false);
135
136}
137
138int iwl_legacy_send_add_sta(struct iwl_priv *priv,
139 struct iwl_legacy_addsta_cmd *sta, u8 flags)
140{
141 struct iwl_rx_packet *pkt = NULL;
142 int ret = 0;
143 u8 data[sizeof(*sta)];
144 struct iwl_host_cmd cmd = {
145 .id = REPLY_ADD_STA,
146 .flags = flags,
147 .data = data,
148 };
149 u8 sta_id __maybe_unused = sta->sta.sta_id;
150
151 IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
152 sta_id, sta->sta.addr, flags & CMD_ASYNC ? "a" : "");
153
154 if (flags & CMD_ASYNC)
155 cmd.callback = iwl_legacy_add_sta_callback;
156 else {
157 cmd.flags |= CMD_WANT_SKB;
158 might_sleep();
159 }
160
161 cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
162 ret = iwl_legacy_send_cmd(priv, &cmd);
163
164 if (ret || (flags & CMD_ASYNC))
165 return ret;
166
167 if (ret == 0) {
168 pkt = (struct iwl_rx_packet *)cmd.reply_page;
169 ret = iwl_legacy_process_add_sta_resp(priv, sta, pkt, true);
170 }
171 iwl_legacy_free_pages(priv, cmd.reply_page);
172
173 return ret;
174}
175EXPORT_SYMBOL(iwl_legacy_send_add_sta);
176
177static void iwl_legacy_set_ht_add_station(struct iwl_priv *priv, u8 index,
178 struct ieee80211_sta *sta,
179 struct iwl_rxon_context *ctx)
180{
181 struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
182 __le32 sta_flags;
183 u8 mimo_ps_mode;
184
185 if (!sta || !sta_ht_inf->ht_supported)
186 goto done;
187
188 mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
189 IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
190 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
191 "static" :
192 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
193 "dynamic" : "disabled");
194
195 sta_flags = priv->stations[index].sta.station_flags;
196
197 sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
198
199 switch (mimo_ps_mode) {
200 case WLAN_HT_CAP_SM_PS_STATIC:
201 sta_flags |= STA_FLG_MIMO_DIS_MSK;
202 break;
203 case WLAN_HT_CAP_SM_PS_DYNAMIC:
204 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
205 break;
206 case WLAN_HT_CAP_SM_PS_DISABLED:
207 break;
208 default:
209 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
210 break;
211 }
212
213 sta_flags |= cpu_to_le32(
214 (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
215
216 sta_flags |= cpu_to_le32(
217 (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
218
219 if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
220 sta_flags |= STA_FLG_HT40_EN_MSK;
221 else
222 sta_flags &= ~STA_FLG_HT40_EN_MSK;
223
224 priv->stations[index].sta.station_flags = sta_flags;
225 done:
226 return;
227}
228
229/**
230 * iwl_legacy_prep_station - Prepare station information for addition
231 *
232 * should be called with sta_lock held
233 */
234u8 iwl_legacy_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
235 const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
236{
237 struct iwl_station_entry *station;
238 int i;
239 u8 sta_id = IWL_INVALID_STATION;
240 u16 rate;
241
242 if (is_ap)
243 sta_id = ctx->ap_sta_id;
244 else if (is_broadcast_ether_addr(addr))
245 sta_id = ctx->bcast_sta_id;
246 else
247 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
248 if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
249 addr)) {
250 sta_id = i;
251 break;
252 }
253
254 if (!priv->stations[i].used &&
255 sta_id == IWL_INVALID_STATION)
256 sta_id = i;
257 }
258
259 /*
260 * These two conditions have the same outcome, but keep them
261 * separate
262 */
263 if (unlikely(sta_id == IWL_INVALID_STATION))
264 return sta_id;
265
266 /*
267 * uCode is not able to deal with multiple requests to add a
268 * station. Keep track if one is in progress so that we do not send
269 * another.
270 */
271 if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
272 IWL_DEBUG_INFO(priv,
273 "STA %d already in process of being added.\n",
274 sta_id);
275 return sta_id;
276 }
277
278 if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
279 (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
280 !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
281 IWL_DEBUG_ASSOC(priv,
282 "STA %d (%pM) already added, not adding again.\n",
283 sta_id, addr);
284 return sta_id;
285 }
286
287 station = &priv->stations[sta_id];
288 station->used = IWL_STA_DRIVER_ACTIVE;
289 IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
290 sta_id, addr);
291 priv->num_stations++;
292
293 /* Set up the REPLY_ADD_STA command to send to device */
294 memset(&station->sta, 0, sizeof(struct iwl_legacy_addsta_cmd));
295 memcpy(station->sta.sta.addr, addr, ETH_ALEN);
296 station->sta.mode = 0;
297 station->sta.sta.sta_id = sta_id;
298 station->sta.station_flags = ctx->station_flags;
299 station->ctxid = ctx->ctxid;
300
301 if (sta) {
302 struct iwl_station_priv_common *sta_priv;
303
304 sta_priv = (void *)sta->drv_priv;
305 sta_priv->ctx = ctx;
306 }
307
308 /*
309 * OK to call unconditionally, since local stations (IBSS BSSID
310 * STA and broadcast STA) pass in a NULL sta, and mac80211
311 * doesn't allow HT IBSS.
312 */
313 iwl_legacy_set_ht_add_station(priv, sta_id, sta, ctx);
314
315 /* 3945 only */
316 rate = (priv->band == IEEE80211_BAND_5GHZ) ?
317 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
318 /* Turn on both antennas for the station... */
319 station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
320
321 return sta_id;
322
323}
324EXPORT_SYMBOL_GPL(iwl_legacy_prep_station);
325
326#define STA_WAIT_TIMEOUT (HZ/2)
327
328/**
329 * iwl_legacy_add_station_common -
330 */
331int
332iwl_legacy_add_station_common(struct iwl_priv *priv,
333 struct iwl_rxon_context *ctx,
334 const u8 *addr, bool is_ap,
335 struct ieee80211_sta *sta, u8 *sta_id_r)
336{
337 unsigned long flags_spin;
338 int ret = 0;
339 u8 sta_id;
340 struct iwl_legacy_addsta_cmd sta_cmd;
341
342 *sta_id_r = 0;
343 spin_lock_irqsave(&priv->sta_lock, flags_spin);
344 sta_id = iwl_legacy_prep_station(priv, ctx, addr, is_ap, sta);
345 if (sta_id == IWL_INVALID_STATION) {
346 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
347 addr);
348 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
349 return -EINVAL;
350 }
351
352 /*
353 * uCode is not able to deal with multiple requests to add a
354 * station. Keep track if one is in progress so that we do not send
355 * another.
356 */
357 if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
358 IWL_DEBUG_INFO(priv,
359 "STA %d already in process of being added.\n",
360 sta_id);
361 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
362 return -EEXIST;
363 }
364
365 if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
366 (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
367 IWL_DEBUG_ASSOC(priv,
368 "STA %d (%pM) already added, not adding again.\n",
369 sta_id, addr);
370 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
371 return -EEXIST;
372 }
373
374 priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
375 memcpy(&sta_cmd, &priv->stations[sta_id].sta,
376 sizeof(struct iwl_legacy_addsta_cmd));
377 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
378
379 /* Add station to device's station table */
380 ret = iwl_legacy_send_add_sta(priv, &sta_cmd, CMD_SYNC);
381 if (ret) {
382 spin_lock_irqsave(&priv->sta_lock, flags_spin);
383 IWL_ERR(priv, "Adding station %pM failed.\n",
384 priv->stations[sta_id].sta.sta.addr);
385 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
386 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
387 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
388 }
389 *sta_id_r = sta_id;
390 return ret;
391}
392EXPORT_SYMBOL(iwl_legacy_add_station_common);
393
394/**
395 * iwl_legacy_sta_ucode_deactivate - deactivate ucode status for a station
396 *
397 * priv->sta_lock must be held
398 */
399static void iwl_legacy_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
400{
401 /* Ucode must be active and driver must be non active */
402 if ((priv->stations[sta_id].used &
403 (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) !=
404 IWL_STA_UCODE_ACTIVE)
405 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
406
407 priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
408
409 memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
410 IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
411}
412
413static int iwl_legacy_send_remove_station(struct iwl_priv *priv,
414 const u8 *addr, int sta_id,
415 bool temporary)
416{
417 struct iwl_rx_packet *pkt;
418 int ret;
419
420 unsigned long flags_spin;
421 struct iwl_rem_sta_cmd rm_sta_cmd;
422
423 struct iwl_host_cmd cmd = {
424 .id = REPLY_REMOVE_STA,
425 .len = sizeof(struct iwl_rem_sta_cmd),
426 .flags = CMD_SYNC,
427 .data = &rm_sta_cmd,
428 };
429
430 memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
431 rm_sta_cmd.num_sta = 1;
432 memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
433
434 cmd.flags |= CMD_WANT_SKB;
435
436 ret = iwl_legacy_send_cmd(priv, &cmd);
437
438 if (ret)
439 return ret;
440
441 pkt = (struct iwl_rx_packet *)cmd.reply_page;
442 if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
443 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
444 pkt->hdr.flags);
445 ret = -EIO;
446 }
447
448 if (!ret) {
449 switch (pkt->u.rem_sta.status) {
450 case REM_STA_SUCCESS_MSK:
451 if (!temporary) {
452 spin_lock_irqsave(&priv->sta_lock, flags_spin);
453 iwl_legacy_sta_ucode_deactivate(priv, sta_id);
454 spin_unlock_irqrestore(&priv->sta_lock,
455 flags_spin);
456 }
457 IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
458 break;
459 default:
460 ret = -EIO;
461 IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
462 break;
463 }
464 }
465 iwl_legacy_free_pages(priv, cmd.reply_page);
466
467 return ret;
468}
469
470/**
471 * iwl_legacy_remove_station - Remove driver's knowledge of station.
472 */
473int iwl_legacy_remove_station(struct iwl_priv *priv, const u8 sta_id,
474 const u8 *addr)
475{
476 unsigned long flags;
477
478 if (!iwl_legacy_is_ready(priv)) {
479 IWL_DEBUG_INFO(priv,
480 "Unable to remove station %pM, device not ready.\n",
481 addr);
482 /*
483 * It is typical for stations to be removed when we are
484 * going down. Return success since device will be down
485 * soon anyway
486 */
487 return 0;
488 }
489
490 IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d %pM\n",
491 sta_id, addr);
492
493 if (WARN_ON(sta_id == IWL_INVALID_STATION))
494 return -EINVAL;
495
496 spin_lock_irqsave(&priv->sta_lock, flags);
497
498 if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
499 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
500 addr);
501 goto out_err;
502 }
503
504 if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
505 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
506 addr);
507 goto out_err;
508 }
509
510 if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
511 kfree(priv->stations[sta_id].lq);
512 priv->stations[sta_id].lq = NULL;
513 }
514
515 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
516
517 priv->num_stations--;
518
519 BUG_ON(priv->num_stations < 0);
520
521 spin_unlock_irqrestore(&priv->sta_lock, flags);
522
523 return iwl_legacy_send_remove_station(priv, addr, sta_id, false);
524out_err:
525 spin_unlock_irqrestore(&priv->sta_lock, flags);
526 return -EINVAL;
527}
528EXPORT_SYMBOL_GPL(iwl_legacy_remove_station);
529
530/**
531 * iwl_legacy_clear_ucode_stations - clear ucode station table bits
532 *
533 * This function clears all the bits in the driver indicating
534 * which stations are active in the ucode. Call when something
535 * other than explicit station management would cause this in
536 * the ucode, e.g. unassociated RXON.
537 */
538void iwl_legacy_clear_ucode_stations(struct iwl_priv *priv,
539 struct iwl_rxon_context *ctx)
540{
541 int i;
542 unsigned long flags_spin;
543 bool cleared = false;
544
545 IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
546
547 spin_lock_irqsave(&priv->sta_lock, flags_spin);
548 for (i = 0; i < priv->hw_params.max_stations; i++) {
549 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
550 continue;
551
552 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
553 IWL_DEBUG_INFO(priv,
554 "Clearing ucode active for station %d\n", i);
555 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
556 cleared = true;
557 }
558 }
559 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
560
561 if (!cleared)
562 IWL_DEBUG_INFO(priv,
563 "No active stations found to be cleared\n");
564}
565EXPORT_SYMBOL(iwl_legacy_clear_ucode_stations);
566
567/**
568 * iwl_legacy_restore_stations() - Restore driver known stations to device
569 *
570 * All stations considered active by driver, but not present in ucode, is
571 * restored.
572 *
573 * Function sleeps.
574 */
575void
576iwl_legacy_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
577{
578 struct iwl_legacy_addsta_cmd sta_cmd;
579 struct iwl_link_quality_cmd lq;
580 unsigned long flags_spin;
581 int i;
582 bool found = false;
583 int ret;
584 bool send_lq;
585
586 if (!iwl_legacy_is_ready(priv)) {
587 IWL_DEBUG_INFO(priv,
588 "Not ready yet, not restoring any stations.\n");
589 return;
590 }
591
592 IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
593 spin_lock_irqsave(&priv->sta_lock, flags_spin);
594 for (i = 0; i < priv->hw_params.max_stations; i++) {
595 if (ctx->ctxid != priv->stations[i].ctxid)
596 continue;
597 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
598 !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
599 IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
600 priv->stations[i].sta.sta.addr);
601 priv->stations[i].sta.mode = 0;
602 priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
603 found = true;
604 }
605 }
606
607 for (i = 0; i < priv->hw_params.max_stations; i++) {
608 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
609 memcpy(&sta_cmd, &priv->stations[i].sta,
610 sizeof(struct iwl_legacy_addsta_cmd));
611 send_lq = false;
612 if (priv->stations[i].lq) {
613 memcpy(&lq, priv->stations[i].lq,
614 sizeof(struct iwl_link_quality_cmd));
615 send_lq = true;
616 }
617 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
618 ret = iwl_legacy_send_add_sta(priv, &sta_cmd, CMD_SYNC);
619 if (ret) {
620 spin_lock_irqsave(&priv->sta_lock, flags_spin);
621 IWL_ERR(priv, "Adding station %pM failed.\n",
622 priv->stations[i].sta.sta.addr);
623 priv->stations[i].used &=
624 ~IWL_STA_DRIVER_ACTIVE;
625 priv->stations[i].used &=
626 ~IWL_STA_UCODE_INPROGRESS;
627 spin_unlock_irqrestore(&priv->sta_lock,
628 flags_spin);
629 }
630 /*
631 * Rate scaling has already been initialized, send
632 * current LQ command
633 */
634 if (send_lq)
635 iwl_legacy_send_lq_cmd(priv, ctx, &lq,
636 CMD_SYNC, true);
637 spin_lock_irqsave(&priv->sta_lock, flags_spin);
638 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
639 }
640 }
641
642 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
643 if (!found)
644 IWL_DEBUG_INFO(priv, "Restoring all known stations"
645 " .... no stations to be restored.\n");
646 else
647 IWL_DEBUG_INFO(priv, "Restoring all known stations"
648 " .... complete.\n");
649}
650EXPORT_SYMBOL(iwl_legacy_restore_stations);
651
652int iwl_legacy_get_free_ucode_key_index(struct iwl_priv *priv)
653{
654 int i;
655
656 for (i = 0; i < priv->sta_key_max_num; i++)
657 if (!test_and_set_bit(i, &priv->ucode_key_table))
658 return i;
659
660 return WEP_INVALID_OFFSET;
661}
662EXPORT_SYMBOL(iwl_legacy_get_free_ucode_key_index);
663
664void iwl_legacy_dealloc_bcast_stations(struct iwl_priv *priv)
665{
666 unsigned long flags;
667 int i;
668
669 spin_lock_irqsave(&priv->sta_lock, flags);
670 for (i = 0; i < priv->hw_params.max_stations; i++) {
671 if (!(priv->stations[i].used & IWL_STA_BCAST))
672 continue;
673
674 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
675 priv->num_stations--;
676 BUG_ON(priv->num_stations < 0);
677 kfree(priv->stations[i].lq);
678 priv->stations[i].lq = NULL;
679 }
680 spin_unlock_irqrestore(&priv->sta_lock, flags);
681}
682EXPORT_SYMBOL_GPL(iwl_legacy_dealloc_bcast_stations);
683
684#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
685static void iwl_legacy_dump_lq_cmd(struct iwl_priv *priv,
686 struct iwl_link_quality_cmd *lq)
687{
688 int i;
689 IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
690 IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
691 lq->general_params.single_stream_ant_msk,
692 lq->general_params.dual_stream_ant_msk);
693
694 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
695 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
696 i, lq->rs_table[i].rate_n_flags);
697}
698#else
699static inline void iwl_legacy_dump_lq_cmd(struct iwl_priv *priv,
700 struct iwl_link_quality_cmd *lq)
701{
702}
703#endif
704
705/**
706 * iwl_legacy_is_lq_table_valid() - Test one aspect of LQ cmd for validity
707 *
708 * It sometimes happens when a HT rate has been in use and we
709 * loose connectivity with AP then mac80211 will first tell us that the
710 * current channel is not HT anymore before removing the station. In such a
711 * scenario the RXON flags will be updated to indicate we are not
712 * communicating HT anymore, but the LQ command may still contain HT rates.
713 * Test for this to prevent driver from sending LQ command between the time
714 * RXON flags are updated and when LQ command is updated.
715 */
716static bool iwl_legacy_is_lq_table_valid(struct iwl_priv *priv,
717 struct iwl_rxon_context *ctx,
718 struct iwl_link_quality_cmd *lq)
719{
720 int i;
721
722 if (ctx->ht.enabled)
723 return true;
724
725 IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
726 ctx->active.channel);
727 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
728 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) &
729 RATE_MCS_HT_MSK) {
730 IWL_DEBUG_INFO(priv,
731 "index %d of LQ expects HT channel\n",
732 i);
733 return false;
734 }
735 }
736 return true;
737}
738
739/**
740 * iwl_legacy_send_lq_cmd() - Send link quality command
741 * @init: This command is sent as part of station initialization right
742 * after station has been added.
743 *
744 * The link quality command is sent as the last step of station creation.
745 * This is the special case in which init is set and we call a callback in
746 * this case to clear the state indicating that station creation is in
747 * progress.
748 */
749int iwl_legacy_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
750 struct iwl_link_quality_cmd *lq, u8 flags, bool init)
751{
752 int ret = 0;
753 unsigned long flags_spin;
754
755 struct iwl_host_cmd cmd = {
756 .id = REPLY_TX_LINK_QUALITY_CMD,
757 .len = sizeof(struct iwl_link_quality_cmd),
758 .flags = flags,
759 .data = lq,
760 };
761
762 if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
763 return -EINVAL;
764
765
766 spin_lock_irqsave(&priv->sta_lock, flags_spin);
767 if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
768 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
769 return -EINVAL;
770 }
771 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
772
773 iwl_legacy_dump_lq_cmd(priv, lq);
774 BUG_ON(init && (cmd.flags & CMD_ASYNC));
775
776 if (iwl_legacy_is_lq_table_valid(priv, ctx, lq))
777 ret = iwl_legacy_send_cmd(priv, &cmd);
778 else
779 ret = -EINVAL;
780
781 if (cmd.flags & CMD_ASYNC)
782 return ret;
783
784 if (init) {
785 IWL_DEBUG_INFO(priv, "init LQ command complete,"
786 " clearing sta addition status for sta %d\n",
787 lq->sta_id);
788 spin_lock_irqsave(&priv->sta_lock, flags_spin);
789 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
790 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
791 }
792 return ret;
793}
794EXPORT_SYMBOL(iwl_legacy_send_lq_cmd);
795
796int iwl_legacy_mac_sta_remove(struct ieee80211_hw *hw,
797 struct ieee80211_vif *vif,
798 struct ieee80211_sta *sta)
799{
800 struct iwl_priv *priv = hw->priv;
801 struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
802 int ret;
803
804 IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
805 sta->addr);
806 mutex_lock(&priv->mutex);
807 IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
808 sta->addr);
809 ret = iwl_legacy_remove_station(priv, sta_common->sta_id, sta->addr);
810 if (ret)
811 IWL_ERR(priv, "Error removing station %pM\n",
812 sta->addr);
813 mutex_unlock(&priv->mutex);
814 return ret;
815}
816EXPORT_SYMBOL(iwl_legacy_mac_sta_remove);