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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#include "iwl-trans.h"
39#include "iwl-agn.h"
40
41/* priv->sta_lock must be held */
42static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
43{
44
45 if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
46 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
47 sta_id, priv->stations[sta_id].sta.sta.addr);
48
49 if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
50 IWL_DEBUG_ASSOC(priv,
51 "STA id %u addr %pM already present 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_process_add_sta_resp(struct iwl_priv *priv,
61 struct iwl_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_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, "Adding station %d failed, no block ack resource.\n",
92 sta_id);
93 break;
94 case ADD_STA_MODIFY_NON_EXIST_STA:
95 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
96 sta_id);
97 break;
98 default:
99 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
100 pkt->u.add_sta.status);
101 break;
102 }
103
104 IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
105 priv->stations[sta_id].sta.mode ==
106 STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
107 sta_id, priv->stations[sta_id].sta.sta.addr);
108
109 /*
110 * XXX: The MAC address in the command buffer is often changed from
111 * the original sent to the device. That is, the MAC address
112 * written to the command buffer often is not the same MAC address
113 * read from the command buffer when the command returns. This
114 * issue has not yet been resolved and this debugging is left to
115 * observe the problem.
116 */
117 IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
118 priv->stations[sta_id].sta.mode ==
119 STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
120 addsta->sta.addr);
121 spin_unlock_irqrestore(&priv->sta_lock, flags);
122
123 return ret;
124}
125
126static void iwl_add_sta_callback(struct iwl_priv *priv,
127 struct iwl_device_cmd *cmd,
128 struct iwl_rx_packet *pkt)
129{
130 struct iwl_addsta_cmd *addsta =
131 (struct iwl_addsta_cmd *)cmd->cmd.payload;
132
133 iwl_process_add_sta_resp(priv, addsta, pkt, false);
134
135}
136
137static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
138{
139 u16 size = (u16)sizeof(struct iwl_addsta_cmd);
140 struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
141 memcpy(addsta, cmd, size);
142 /* resrved in 5000 */
143 addsta->rate_n_flags = cpu_to_le16(0);
144 return size;
145}
146
147int iwl_send_add_sta(struct iwl_priv *priv,
148 struct iwl_addsta_cmd *sta, u8 flags)
149{
150 struct iwl_rx_packet *pkt = NULL;
151 int ret = 0;
152 u8 data[sizeof(*sta)];
153 struct iwl_host_cmd cmd = {
154 .id = REPLY_ADD_STA,
155 .flags = flags,
156 .data = { data, },
157 };
158 u8 sta_id __maybe_unused = sta->sta.sta_id;
159
160 IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
161 sta_id, sta->sta.addr, flags & CMD_ASYNC ? "a" : "");
162
163 if (flags & CMD_ASYNC)
164 cmd.callback = iwl_add_sta_callback;
165 else {
166 cmd.flags |= CMD_WANT_SKB;
167 might_sleep();
168 }
169
170 cmd.len[0] = iwlagn_build_addsta_hcmd(sta, data);
171 ret = trans_send_cmd(&priv->trans, &cmd);
172
173 if (ret || (flags & CMD_ASYNC))
174 return ret;
175
176 if (ret == 0) {
177 pkt = (struct iwl_rx_packet *)cmd.reply_page;
178 ret = iwl_process_add_sta_resp(priv, sta, pkt, true);
179 }
180 iwl_free_pages(priv, cmd.reply_page);
181
182 return ret;
183}
184
185static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
186 struct ieee80211_sta *sta,
187 struct iwl_rxon_context *ctx)
188{
189 struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
190 __le32 sta_flags;
191 u8 mimo_ps_mode;
192
193 if (!sta || !sta_ht_inf->ht_supported)
194 goto done;
195
196 mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
197 IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
198 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
199 "static" :
200 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
201 "dynamic" : "disabled");
202
203 sta_flags = priv->stations[index].sta.station_flags;
204
205 sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
206
207 switch (mimo_ps_mode) {
208 case WLAN_HT_CAP_SM_PS_STATIC:
209 sta_flags |= STA_FLG_MIMO_DIS_MSK;
210 break;
211 case WLAN_HT_CAP_SM_PS_DYNAMIC:
212 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
213 break;
214 case WLAN_HT_CAP_SM_PS_DISABLED:
215 break;
216 default:
217 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
218 break;
219 }
220
221 sta_flags |= cpu_to_le32(
222 (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
223
224 sta_flags |= cpu_to_le32(
225 (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
226
227 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
228 sta_flags |= STA_FLG_HT40_EN_MSK;
229 else
230 sta_flags &= ~STA_FLG_HT40_EN_MSK;
231
232 priv->stations[index].sta.station_flags = sta_flags;
233 done:
234 return;
235}
236
237/**
238 * iwl_prep_station - Prepare station information for addition
239 *
240 * should be called with sta_lock held
241 */
242u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
243 const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
244{
245 struct iwl_station_entry *station;
246 int i;
247 u8 sta_id = IWL_INVALID_STATION;
248
249 if (is_ap)
250 sta_id = ctx->ap_sta_id;
251 else if (is_broadcast_ether_addr(addr))
252 sta_id = ctx->bcast_sta_id;
253 else
254 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
255 if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
256 addr)) {
257 sta_id = i;
258 break;
259 }
260
261 if (!priv->stations[i].used &&
262 sta_id == IWL_INVALID_STATION)
263 sta_id = i;
264 }
265
266 /*
267 * These two conditions have the same outcome, but keep them
268 * separate
269 */
270 if (unlikely(sta_id == IWL_INVALID_STATION))
271 return sta_id;
272
273 /*
274 * uCode is not able to deal with multiple requests to add a
275 * station. Keep track if one is in progress so that we do not send
276 * another.
277 */
278 if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
279 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
280 sta_id);
281 return sta_id;
282 }
283
284 if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
285 (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
286 !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
287 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
288 sta_id, addr);
289 return sta_id;
290 }
291
292 station = &priv->stations[sta_id];
293 station->used = IWL_STA_DRIVER_ACTIVE;
294 IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
295 sta_id, addr);
296 priv->num_stations++;
297
298 /* Set up the REPLY_ADD_STA command to send to device */
299 memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
300 memcpy(station->sta.sta.addr, addr, ETH_ALEN);
301 station->sta.mode = 0;
302 station->sta.sta.sta_id = sta_id;
303 station->sta.station_flags = ctx->station_flags;
304 station->ctxid = ctx->ctxid;
305
306 if (sta) {
307 struct iwl_station_priv_common *sta_priv;
308
309 sta_priv = (void *)sta->drv_priv;
310 sta_priv->ctx = ctx;
311 }
312
313 /*
314 * OK to call unconditionally, since local stations (IBSS BSSID
315 * STA and broadcast STA) pass in a NULL sta, and mac80211
316 * doesn't allow HT IBSS.
317 */
318 iwl_set_ht_add_station(priv, sta_id, sta, ctx);
319
320 return sta_id;
321
322}
323
324#define STA_WAIT_TIMEOUT (HZ/2)
325
326/**
327 * iwl_add_station_common -
328 */
329int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
330 const u8 *addr, bool is_ap,
331 struct ieee80211_sta *sta, u8 *sta_id_r)
332{
333 unsigned long flags_spin;
334 int ret = 0;
335 u8 sta_id;
336 struct iwl_addsta_cmd sta_cmd;
337
338 *sta_id_r = 0;
339 spin_lock_irqsave(&priv->sta_lock, flags_spin);
340 sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
341 if (sta_id == IWL_INVALID_STATION) {
342 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
343 addr);
344 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
345 return -EINVAL;
346 }
347
348 /*
349 * uCode is not able to deal with multiple requests to add a
350 * station. Keep track if one is in progress so that we do not send
351 * another.
352 */
353 if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
354 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
355 sta_id);
356 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
357 return -EEXIST;
358 }
359
360 if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
361 (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
362 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
363 sta_id, addr);
364 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
365 return -EEXIST;
366 }
367
368 priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
369 memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
370 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
371
372 /* Add station to device's station table */
373 ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
374 if (ret) {
375 spin_lock_irqsave(&priv->sta_lock, flags_spin);
376 IWL_ERR(priv, "Adding station %pM failed.\n",
377 priv->stations[sta_id].sta.sta.addr);
378 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
379 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
380 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
381 }
382 *sta_id_r = sta_id;
383 return ret;
384}
385
386/**
387 * iwl_sta_ucode_deactivate - deactivate ucode status for a station
388 *
389 * priv->sta_lock must be held
390 */
391static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
392{
393 /* Ucode must be active and driver must be non active */
394 if ((priv->stations[sta_id].used &
395 (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
396 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
397
398 priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
399
400 memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
401 IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
402}
403
404static int iwl_send_remove_station(struct iwl_priv *priv,
405 const u8 *addr, int sta_id,
406 bool temporary)
407{
408 struct iwl_rx_packet *pkt;
409 int ret;
410
411 unsigned long flags_spin;
412 struct iwl_rem_sta_cmd rm_sta_cmd;
413
414 struct iwl_host_cmd cmd = {
415 .id = REPLY_REMOVE_STA,
416 .len = { sizeof(struct iwl_rem_sta_cmd), },
417 .flags = CMD_SYNC,
418 .data = { &rm_sta_cmd, },
419 };
420
421 memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
422 rm_sta_cmd.num_sta = 1;
423 memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
424
425 cmd.flags |= CMD_WANT_SKB;
426
427 ret = trans_send_cmd(&priv->trans, &cmd);
428
429 if (ret)
430 return ret;
431
432 pkt = (struct iwl_rx_packet *)cmd.reply_page;
433 if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
434 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
435 pkt->hdr.flags);
436 ret = -EIO;
437 }
438
439 if (!ret) {
440 switch (pkt->u.rem_sta.status) {
441 case REM_STA_SUCCESS_MSK:
442 if (!temporary) {
443 spin_lock_irqsave(&priv->sta_lock, flags_spin);
444 iwl_sta_ucode_deactivate(priv, sta_id);
445 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
446 }
447 IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
448 break;
449 default:
450 ret = -EIO;
451 IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
452 break;
453 }
454 }
455 iwl_free_pages(priv, cmd.reply_page);
456
457 return ret;
458}
459
460/**
461 * iwl_remove_station - Remove driver's knowledge of station.
462 */
463int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
464 const u8 *addr)
465{
466 unsigned long flags;
467
468 if (!iwl_is_ready(priv)) {
469 IWL_DEBUG_INFO(priv,
470 "Unable to remove station %pM, device not ready.\n",
471 addr);
472 /*
473 * It is typical for stations to be removed when we are
474 * going down. Return success since device will be down
475 * soon anyway
476 */
477 return 0;
478 }
479
480 IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d %pM\n",
481 sta_id, addr);
482
483 if (WARN_ON(sta_id == IWL_INVALID_STATION))
484 return -EINVAL;
485
486 spin_lock_irqsave(&priv->sta_lock, flags);
487
488 if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
489 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
490 addr);
491 goto out_err;
492 }
493
494 if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
495 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
496 addr);
497 goto out_err;
498 }
499
500 if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
501 kfree(priv->stations[sta_id].lq);
502 priv->stations[sta_id].lq = NULL;
503 }
504
505 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
506
507 priv->num_stations--;
508
509 if (WARN_ON(priv->num_stations < 0))
510 priv->num_stations = 0;
511
512 spin_unlock_irqrestore(&priv->sta_lock, flags);
513
514 return iwl_send_remove_station(priv, addr, sta_id, false);
515out_err:
516 spin_unlock_irqrestore(&priv->sta_lock, flags);
517 return -EINVAL;
518}
519
520/**
521 * iwl_clear_ucode_stations - clear ucode station table bits
522 *
523 * This function clears all the bits in the driver indicating
524 * which stations are active in the ucode. Call when something
525 * other than explicit station management would cause this in
526 * the ucode, e.g. unassociated RXON.
527 */
528void iwl_clear_ucode_stations(struct iwl_priv *priv,
529 struct iwl_rxon_context *ctx)
530{
531 int i;
532 unsigned long flags_spin;
533 bool cleared = false;
534
535 IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
536
537 spin_lock_irqsave(&priv->sta_lock, flags_spin);
538 for (i = 0; i < priv->hw_params.max_stations; i++) {
539 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
540 continue;
541
542 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
543 IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
544 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
545 cleared = true;
546 }
547 }
548 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
549
550 if (!cleared)
551 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
552}
553
554/**
555 * iwl_restore_stations() - Restore driver known stations to device
556 *
557 * All stations considered active by driver, but not present in ucode, is
558 * restored.
559 *
560 * Function sleeps.
561 */
562void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
563{
564 struct iwl_addsta_cmd sta_cmd;
565 struct iwl_link_quality_cmd lq;
566 unsigned long flags_spin;
567 int i;
568 bool found = false;
569 int ret;
570 bool send_lq;
571
572 if (!iwl_is_ready(priv)) {
573 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
574 return;
575 }
576
577 IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
578 spin_lock_irqsave(&priv->sta_lock, flags_spin);
579 for (i = 0; i < priv->hw_params.max_stations; i++) {
580 if (ctx->ctxid != priv->stations[i].ctxid)
581 continue;
582 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
583 !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
584 IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
585 priv->stations[i].sta.sta.addr);
586 priv->stations[i].sta.mode = 0;
587 priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
588 found = true;
589 }
590 }
591
592 for (i = 0; i < priv->hw_params.max_stations; i++) {
593 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
594 memcpy(&sta_cmd, &priv->stations[i].sta,
595 sizeof(struct iwl_addsta_cmd));
596 send_lq = false;
597 if (priv->stations[i].lq) {
598 memcpy(&lq, priv->stations[i].lq,
599 sizeof(struct iwl_link_quality_cmd));
600 send_lq = true;
601 }
602 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
603 ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
604 if (ret) {
605 spin_lock_irqsave(&priv->sta_lock, flags_spin);
606 IWL_ERR(priv, "Adding station %pM failed.\n",
607 priv->stations[i].sta.sta.addr);
608 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
609 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
610 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
611 }
612 /*
613 * Rate scaling has already been initialized, send
614 * current LQ command
615 */
616 if (send_lq)
617 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
618 spin_lock_irqsave(&priv->sta_lock, flags_spin);
619 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
620 }
621 }
622
623 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
624 if (!found)
625 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
626 else
627 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
628}
629
630void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
631{
632 unsigned long flags;
633 int sta_id = ctx->ap_sta_id;
634 int ret;
635 struct iwl_addsta_cmd sta_cmd;
636 struct iwl_link_quality_cmd lq;
637 bool active;
638
639 spin_lock_irqsave(&priv->sta_lock, flags);
640 if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
641 spin_unlock_irqrestore(&priv->sta_lock, flags);
642 return;
643 }
644
645 memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
646 sta_cmd.mode = 0;
647 memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
648
649 active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
650 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
651 spin_unlock_irqrestore(&priv->sta_lock, flags);
652
653 if (active) {
654 ret = iwl_send_remove_station(
655 priv, priv->stations[sta_id].sta.sta.addr,
656 sta_id, true);
657 if (ret)
658 IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
659 priv->stations[sta_id].sta.sta.addr, ret);
660 }
661 spin_lock_irqsave(&priv->sta_lock, flags);
662 priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
663 spin_unlock_irqrestore(&priv->sta_lock, flags);
664
665 ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
666 if (ret)
667 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
668 priv->stations[sta_id].sta.sta.addr, ret);
669 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
670}
671
672int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
673{
674 int i;
675
676 for (i = 0; i < priv->sta_key_max_num; i++)
677 if (!test_and_set_bit(i, &priv->ucode_key_table))
678 return i;
679
680 return WEP_INVALID_OFFSET;
681}
682
683void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
684{
685 unsigned long flags;
686 int i;
687
688 spin_lock_irqsave(&priv->sta_lock, flags);
689 for (i = 0; i < priv->hw_params.max_stations; i++) {
690 if (!(priv->stations[i].used & IWL_STA_BCAST))
691 continue;
692
693 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
694 priv->num_stations--;
695 if (WARN_ON(priv->num_stations < 0))
696 priv->num_stations = 0;
697 kfree(priv->stations[i].lq);
698 priv->stations[i].lq = NULL;
699 }
700 spin_unlock_irqrestore(&priv->sta_lock, flags);
701}
702
703#ifdef CONFIG_IWLWIFI_DEBUG
704static void iwl_dump_lq_cmd(struct iwl_priv *priv,
705 struct iwl_link_quality_cmd *lq)
706{
707 int i;
708 IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
709 IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
710 lq->general_params.single_stream_ant_msk,
711 lq->general_params.dual_stream_ant_msk);
712
713 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
714 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
715 i, lq->rs_table[i].rate_n_flags);
716}
717#else
718static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
719 struct iwl_link_quality_cmd *lq)
720{
721}
722#endif
723
724/**
725 * is_lq_table_valid() - Test one aspect of LQ cmd for validity
726 *
727 * It sometimes happens when a HT rate has been in use and we
728 * loose connectivity with AP then mac80211 will first tell us that the
729 * current channel is not HT anymore before removing the station. In such a
730 * scenario the RXON flags will be updated to indicate we are not
731 * communicating HT anymore, but the LQ command may still contain HT rates.
732 * Test for this to prevent driver from sending LQ command between the time
733 * RXON flags are updated and when LQ command is updated.
734 */
735static bool is_lq_table_valid(struct iwl_priv *priv,
736 struct iwl_rxon_context *ctx,
737 struct iwl_link_quality_cmd *lq)
738{
739 int i;
740
741 if (ctx->ht.enabled)
742 return true;
743
744 IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
745 ctx->active.channel);
746 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
747 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
748 IWL_DEBUG_INFO(priv,
749 "index %d of LQ expects HT channel\n",
750 i);
751 return false;
752 }
753 }
754 return true;
755}
756
757/**
758 * iwl_send_lq_cmd() - Send link quality command
759 * @init: This command is sent as part of station initialization right
760 * after station has been added.
761 *
762 * The link quality command is sent as the last step of station creation.
763 * This is the special case in which init is set and we call a callback in
764 * this case to clear the state indicating that station creation is in
765 * progress.
766 */
767int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
768 struct iwl_link_quality_cmd *lq, u8 flags, bool init)
769{
770 int ret = 0;
771 unsigned long flags_spin;
772
773 struct iwl_host_cmd cmd = {
774 .id = REPLY_TX_LINK_QUALITY_CMD,
775 .len = { sizeof(struct iwl_link_quality_cmd), },
776 .flags = flags,
777 .data = { lq, },
778 };
779
780 if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
781 return -EINVAL;
782
783
784 spin_lock_irqsave(&priv->sta_lock, flags_spin);
785 if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
786 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
787 return -EINVAL;
788 }
789 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
790
791 iwl_dump_lq_cmd(priv, lq);
792 if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
793 return -EINVAL;
794
795 if (is_lq_table_valid(priv, ctx, lq))
796 ret = trans_send_cmd(&priv->trans, &cmd);
797 else
798 ret = -EINVAL;
799
800 if (cmd.flags & CMD_ASYNC)
801 return ret;
802
803 if (init) {
804 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
805 lq->sta_id);
806 spin_lock_irqsave(&priv->sta_lock, flags_spin);
807 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
808 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
809 }
810 return ret;
811}
812
813int iwl_mac_sta_remove(struct ieee80211_hw *hw,
814 struct ieee80211_vif *vif,
815 struct ieee80211_sta *sta)
816{
817 struct iwl_priv *priv = hw->priv;
818 struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
819 int ret;
820
821 IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
822 sta->addr);
823 mutex_lock(&priv->mutex);
824 IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
825 sta->addr);
826 ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
827 if (ret)
828 IWL_ERR(priv, "Error removing station %pM\n",
829 sta->addr);
830 mutex_unlock(&priv->mutex);
831 return ret;
832}