1 /******************************************************************************
2 *
3 * Copyright(c) 2003 - 2010 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 */
iwl_sta_ucode_activate(struct iwl_priv * priv,u8 sta_id)40 static void iwl_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, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
45 sta_id, priv->stations[sta_id].sta.sta.addr);
46
47 if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
48 IWL_DEBUG_ASSOC(priv,
49 "STA id %u addr %pM already present in uCode (according to driver)\n",
50 sta_id, priv->stations[sta_id].sta.sta.addr);
51 } else {
52 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
53 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
54 sta_id, priv->stations[sta_id].sta.sta.addr);
55 }
56 }
57
iwl_process_add_sta_resp(struct iwl_priv * priv,struct iwl_addsta_cmd * addsta,struct iwl_rx_packet * pkt,bool sync)58 static int iwl_process_add_sta_resp(struct iwl_priv *priv,
59 struct iwl_addsta_cmd *addsta,
60 struct iwl_rx_packet *pkt,
61 bool sync)
62 {
63 u8 sta_id = addsta->sta.sta_id;
64 unsigned long flags;
65 int ret = -EIO;
66
67 if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
68 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
69 pkt->hdr.flags);
70 return ret;
71 }
72
73 IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
74 sta_id);
75
76 spin_lock_irqsave(&priv->sta_lock, flags);
77
78 switch (pkt->u.add_sta.status) {
79 case ADD_STA_SUCCESS_MSK:
80 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
81 iwl_sta_ucode_activate(priv, sta_id);
82 ret = 0;
83 break;
84 case ADD_STA_NO_ROOM_IN_TABLE:
85 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
86 sta_id);
87 break;
88 case ADD_STA_NO_BLOCK_ACK_RESOURCE:
89 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
90 sta_id);
91 break;
92 case ADD_STA_MODIFY_NON_EXIST_STA:
93 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
94 sta_id);
95 break;
96 default:
97 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
98 pkt->u.add_sta.status);
99 break;
100 }
101
102 IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
103 priv->stations[sta_id].sta.mode ==
104 STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
105 sta_id, priv->stations[sta_id].sta.sta.addr);
106
107 /*
108 * XXX: The MAC address in the command buffer is often changed from
109 * the original sent to the device. That is, the MAC address
110 * written to the command buffer often is not the same MAC address
111 * read from the command buffer when the command returns. This
112 * issue has not yet been resolved and this debugging is left to
113 * observe the problem.
114 */
115 IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
116 priv->stations[sta_id].sta.mode ==
117 STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
118 addsta->sta.addr);
119 spin_unlock_irqrestore(&priv->sta_lock, flags);
120
121 return ret;
122 }
123
iwl_add_sta_callback(struct iwl_priv * priv,struct iwl_device_cmd * cmd,struct iwl_rx_packet * pkt)124 static void iwl_add_sta_callback(struct iwl_priv *priv,
125 struct iwl_device_cmd *cmd,
126 struct iwl_rx_packet *pkt)
127 {
128 struct iwl_addsta_cmd *addsta =
129 (struct iwl_addsta_cmd *)cmd->cmd.payload;
130
131 iwl_process_add_sta_resp(priv, addsta, pkt, false);
132
133 }
134
iwl_send_add_sta(struct iwl_priv * priv,struct iwl_addsta_cmd * sta,u8 flags)135 int iwl_send_add_sta(struct iwl_priv *priv,
136 struct iwl_addsta_cmd *sta, u8 flags)
137 {
138 struct iwl_rx_packet *pkt = NULL;
139 int ret = 0;
140 u8 data[sizeof(*sta)];
141 struct iwl_host_cmd cmd = {
142 .id = REPLY_ADD_STA,
143 .flags = flags,
144 .data = data,
145 };
146 u8 sta_id __maybe_unused = sta->sta.sta_id;
147
148 IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
149 sta_id, sta->sta.addr, flags & CMD_ASYNC ? "a" : "");
150
151 if (flags & CMD_ASYNC)
152 cmd.callback = iwl_add_sta_callback;
153 else {
154 cmd.flags |= CMD_WANT_SKB;
155 might_sleep();
156 }
157
158 cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
159 ret = iwl_send_cmd(priv, &cmd);
160
161 if (ret || (flags & CMD_ASYNC))
162 return ret;
163
164 if (ret == 0) {
165 pkt = (struct iwl_rx_packet *)cmd.reply_page;
166 ret = iwl_process_add_sta_resp(priv, sta, pkt, true);
167 }
168 iwl_free_pages(priv, cmd.reply_page);
169
170 return ret;
171 }
172
iwl_set_ht_add_station(struct iwl_priv * priv,u8 index,struct ieee80211_sta * sta,struct iwl_rxon_context * ctx)173 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
174 struct ieee80211_sta *sta,
175 struct iwl_rxon_context *ctx)
176 {
177 struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
178 __le32 sta_flags;
179 u8 mimo_ps_mode;
180
181 if (!sta || !sta_ht_inf->ht_supported)
182 goto done;
183
184 mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
185 IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
186 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
187 "static" :
188 (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
189 "dynamic" : "disabled");
190
191 sta_flags = priv->stations[index].sta.station_flags;
192
193 sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
194
195 switch (mimo_ps_mode) {
196 case WLAN_HT_CAP_SM_PS_STATIC:
197 sta_flags |= STA_FLG_MIMO_DIS_MSK;
198 break;
199 case WLAN_HT_CAP_SM_PS_DYNAMIC:
200 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
201 break;
202 case WLAN_HT_CAP_SM_PS_DISABLED:
203 break;
204 default:
205 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
206 break;
207 }
208
209 sta_flags |= cpu_to_le32(
210 (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
211
212 sta_flags |= cpu_to_le32(
213 (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
214
215 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
216 sta_flags |= STA_FLG_HT40_EN_MSK;
217 else
218 sta_flags &= ~STA_FLG_HT40_EN_MSK;
219
220 priv->stations[index].sta.station_flags = sta_flags;
221 done:
222 return;
223 }
224
225 /**
226 * iwl_prep_station - Prepare station information for addition
227 *
228 * should be called with sta_lock held
229 */
iwl_prep_station(struct iwl_priv * priv,struct iwl_rxon_context * ctx,const u8 * addr,bool is_ap,struct ieee80211_sta * sta)230 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
231 const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
232 {
233 struct iwl_station_entry *station;
234 int i;
235 u8 sta_id = IWL_INVALID_STATION;
236 u16 rate;
237
238 if (is_ap)
239 sta_id = ctx->ap_sta_id;
240 else if (is_broadcast_ether_addr(addr))
241 sta_id = ctx->bcast_sta_id;
242 else
243 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
244 if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
245 addr)) {
246 sta_id = i;
247 break;
248 }
249
250 if (!priv->stations[i].used &&
251 sta_id == IWL_INVALID_STATION)
252 sta_id = i;
253 }
254
255 /*
256 * These two conditions have the same outcome, but keep them
257 * separate
258 */
259 if (unlikely(sta_id == IWL_INVALID_STATION))
260 return sta_id;
261
262 /*
263 * uCode is not able to deal with multiple requests to add a
264 * station. Keep track if one is in progress so that we do not send
265 * another.
266 */
267 if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
268 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
269 sta_id);
270 return sta_id;
271 }
272
273 if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
274 (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
275 !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
276 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
277 sta_id, addr);
278 return sta_id;
279 }
280
281 station = &priv->stations[sta_id];
282 station->used = IWL_STA_DRIVER_ACTIVE;
283 IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
284 sta_id, addr);
285 priv->num_stations++;
286
287 /* Set up the REPLY_ADD_STA command to send to device */
288 memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
289 memcpy(station->sta.sta.addr, addr, ETH_ALEN);
290 station->sta.mode = 0;
291 station->sta.sta.sta_id = sta_id;
292 station->sta.station_flags = ctx->station_flags;
293 station->ctxid = ctx->ctxid;
294
295 if (sta) {
296 struct iwl_station_priv_common *sta_priv;
297
298 sta_priv = (void *)sta->drv_priv;
299 sta_priv->ctx = ctx;
300 }
301
302 /*
303 * OK to call unconditionally, since local stations (IBSS BSSID
304 * STA and broadcast STA) pass in a NULL sta, and mac80211
305 * doesn't allow HT IBSS.
306 */
307 iwl_set_ht_add_station(priv, sta_id, sta, ctx);
308
309 /* 3945 only */
310 rate = (priv->band == IEEE80211_BAND_5GHZ) ?
311 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
312 /* Turn on both antennas for the station... */
313 station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
314
315 return sta_id;
316
317 }
318
319 #define STA_WAIT_TIMEOUT (HZ/2)
320
321 /**
322 * iwl_add_station_common -
323 */
iwl_add_station_common(struct iwl_priv * priv,struct iwl_rxon_context * ctx,const u8 * addr,bool is_ap,struct ieee80211_sta * sta,u8 * sta_id_r)324 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
325 const u8 *addr, bool is_ap,
326 struct ieee80211_sta *sta, u8 *sta_id_r)
327 {
328 unsigned long flags_spin;
329 int ret = 0;
330 u8 sta_id;
331 struct iwl_addsta_cmd sta_cmd;
332
333 *sta_id_r = 0;
334 spin_lock_irqsave(&priv->sta_lock, flags_spin);
335 sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
336 if (sta_id == IWL_INVALID_STATION) {
337 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
338 addr);
339 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
340 return -EINVAL;
341 }
342
343 /*
344 * uCode is not able to deal with multiple requests to add a
345 * station. Keep track if one is in progress so that we do not send
346 * another.
347 */
348 if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
349 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
350 sta_id);
351 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
352 return -EEXIST;
353 }
354
355 if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
356 (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
357 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
358 sta_id, addr);
359 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
360 return -EEXIST;
361 }
362
363 priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
364 memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
365 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
366
367 /* Add station to device's station table */
368 ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
369 if (ret) {
370 spin_lock_irqsave(&priv->sta_lock, flags_spin);
371 IWL_ERR(priv, "Adding station %pM failed.\n",
372 priv->stations[sta_id].sta.sta.addr);
373 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
374 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
375 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
376 }
377 *sta_id_r = sta_id;
378 return ret;
379 }
380
381 /**
382 * iwl_sta_ucode_deactivate - deactivate ucode status for a station
383 *
384 * priv->sta_lock must be held
385 */
iwl_sta_ucode_deactivate(struct iwl_priv * priv,u8 sta_id)386 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
387 {
388 /* Ucode must be active and driver must be non active */
389 if ((priv->stations[sta_id].used &
390 (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
391 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
392
393 priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
394
395 memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
396 IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
397 }
398
iwl_send_remove_station(struct iwl_priv * priv,const u8 * addr,int sta_id,bool temporary)399 static int iwl_send_remove_station(struct iwl_priv *priv,
400 const u8 *addr, int sta_id,
401 bool temporary)
402 {
403 struct iwl_rx_packet *pkt;
404 int ret;
405
406 unsigned long flags_spin;
407 struct iwl_rem_sta_cmd rm_sta_cmd;
408
409 struct iwl_host_cmd cmd = {
410 .id = REPLY_REMOVE_STA,
411 .len = sizeof(struct iwl_rem_sta_cmd),
412 .flags = CMD_SYNC,
413 .data = &rm_sta_cmd,
414 };
415
416 memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
417 rm_sta_cmd.num_sta = 1;
418 memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
419
420 cmd.flags |= CMD_WANT_SKB;
421
422 ret = iwl_send_cmd(priv, &cmd);
423
424 if (ret)
425 return ret;
426
427 pkt = (struct iwl_rx_packet *)cmd.reply_page;
428 if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
429 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
430 pkt->hdr.flags);
431 ret = -EIO;
432 }
433
434 if (!ret) {
435 switch (pkt->u.rem_sta.status) {
436 case REM_STA_SUCCESS_MSK:
437 if (!temporary) {
438 spin_lock_irqsave(&priv->sta_lock, flags_spin);
439 iwl_sta_ucode_deactivate(priv, sta_id);
440 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
441 }
442 IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
443 break;
444 default:
445 ret = -EIO;
446 IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
447 break;
448 }
449 }
450 iwl_free_pages(priv, cmd.reply_page);
451
452 return ret;
453 }
454
455 /**
456 * iwl_remove_station - Remove driver's knowledge of station.
457 */
iwl_remove_station(struct iwl_priv * priv,const u8 sta_id,const u8 * addr)458 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
459 const u8 *addr)
460 {
461 unsigned long flags;
462
463 if (!iwl_is_ready(priv)) {
464 IWL_DEBUG_INFO(priv,
465 "Unable to remove station %pM, device not ready.\n",
466 addr);
467 /*
468 * It is typical for stations to be removed when we are
469 * going down. Return success since device will be down
470 * soon anyway
471 */
472 return 0;
473 }
474
475 IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d %pM\n",
476 sta_id, addr);
477
478 if (WARN_ON(sta_id == IWL_INVALID_STATION))
479 return -EINVAL;
480
481 spin_lock_irqsave(&priv->sta_lock, flags);
482
483 if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
484 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
485 addr);
486 goto out_err;
487 }
488
489 if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
490 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
491 addr);
492 goto out_err;
493 }
494
495 if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
496 kfree(priv->stations[sta_id].lq);
497 priv->stations[sta_id].lq = NULL;
498 }
499
500 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
501
502 priv->num_stations--;
503
504 BUG_ON(priv->num_stations < 0);
505
506 spin_unlock_irqrestore(&priv->sta_lock, flags);
507
508 return iwl_send_remove_station(priv, addr, sta_id, false);
509 out_err:
510 spin_unlock_irqrestore(&priv->sta_lock, flags);
511 return -EINVAL;
512 }
513
514 /**
515 * iwl_clear_ucode_stations - clear ucode station table bits
516 *
517 * This function clears all the bits in the driver indicating
518 * which stations are active in the ucode. Call when something
519 * other than explicit station management would cause this in
520 * the ucode, e.g. unassociated RXON.
521 */
iwl_clear_ucode_stations(struct iwl_priv * priv,struct iwl_rxon_context * ctx)522 void iwl_clear_ucode_stations(struct iwl_priv *priv,
523 struct iwl_rxon_context *ctx)
524 {
525 int i;
526 unsigned long flags_spin;
527 bool cleared = false;
528
529 IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
530
531 spin_lock_irqsave(&priv->sta_lock, flags_spin);
532 for (i = 0; i < priv->hw_params.max_stations; i++) {
533 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
534 continue;
535
536 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
537 IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
538 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
539 cleared = true;
540 }
541 }
542 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
543
544 if (!cleared)
545 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
546 }
547
548 /**
549 * iwl_restore_stations() - Restore driver known stations to device
550 *
551 * All stations considered active by driver, but not present in ucode, is
552 * restored.
553 *
554 * Function sleeps.
555 */
iwl_restore_stations(struct iwl_priv * priv,struct iwl_rxon_context * ctx)556 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
557 {
558 struct iwl_addsta_cmd sta_cmd;
559 struct iwl_link_quality_cmd lq;
560 unsigned long flags_spin;
561 int i;
562 bool found = false;
563 int ret;
564 bool send_lq;
565
566 if (!iwl_is_ready(priv)) {
567 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
568 return;
569 }
570
571 IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
572 spin_lock_irqsave(&priv->sta_lock, flags_spin);
573 for (i = 0; i < priv->hw_params.max_stations; i++) {
574 if (ctx->ctxid != priv->stations[i].ctxid)
575 continue;
576 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
577 !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
578 IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
579 priv->stations[i].sta.sta.addr);
580 priv->stations[i].sta.mode = 0;
581 priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
582 found = true;
583 }
584 }
585
586 for (i = 0; i < priv->hw_params.max_stations; i++) {
587 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
588 memcpy(&sta_cmd, &priv->stations[i].sta,
589 sizeof(struct iwl_addsta_cmd));
590 send_lq = false;
591 if (priv->stations[i].lq) {
592 memcpy(&lq, priv->stations[i].lq,
593 sizeof(struct iwl_link_quality_cmd));
594 send_lq = true;
595 }
596 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
597 ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
598 if (ret) {
599 spin_lock_irqsave(&priv->sta_lock, flags_spin);
600 IWL_ERR(priv, "Adding station %pM failed.\n",
601 priv->stations[i].sta.sta.addr);
602 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
603 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
604 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
605 }
606 /*
607 * Rate scaling has already been initialized, send
608 * current LQ command
609 */
610 if (send_lq)
611 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
612 spin_lock_irqsave(&priv->sta_lock, flags_spin);
613 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
614 }
615 }
616
617 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
618 if (!found)
619 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
620 else
621 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
622 }
623
iwl_reprogram_ap_sta(struct iwl_priv * priv,struct iwl_rxon_context * ctx)624 void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
625 {
626 unsigned long flags;
627 int sta_id = ctx->ap_sta_id;
628 int ret;
629 struct iwl_addsta_cmd sta_cmd;
630 struct iwl_link_quality_cmd lq;
631 bool active;
632
633 spin_lock_irqsave(&priv->sta_lock, flags);
634 if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
635 spin_unlock_irqrestore(&priv->sta_lock, flags);
636 return;
637 }
638
639 memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
640 sta_cmd.mode = 0;
641 memcpy(&lq, priv->stations[sta_id].lq, sizeof(lq));
642
643 active = priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE;
644 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
645 spin_unlock_irqrestore(&priv->sta_lock, flags);
646
647 if (active) {
648 ret = iwl_send_remove_station(
649 priv, priv->stations[sta_id].sta.sta.addr,
650 sta_id, true);
651 if (ret)
652 IWL_ERR(priv, "failed to remove STA %pM (%d)\n",
653 priv->stations[sta_id].sta.sta.addr, ret);
654 }
655 spin_lock_irqsave(&priv->sta_lock, flags);
656 priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
657 spin_unlock_irqrestore(&priv->sta_lock, flags);
658
659 ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
660 if (ret)
661 IWL_ERR(priv, "failed to re-add STA %pM (%d)\n",
662 priv->stations[sta_id].sta.sta.addr, ret);
663 iwl_send_lq_cmd(priv, ctx, &lq, CMD_SYNC, true);
664 }
665
iwl_get_free_ucode_key_index(struct iwl_priv * priv)666 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
667 {
668 int i;
669
670 for (i = 0; i < priv->sta_key_max_num; i++)
671 if (!test_and_set_bit(i, &priv->ucode_key_table))
672 return i;
673
674 return WEP_INVALID_OFFSET;
675 }
676
iwl_dealloc_bcast_stations(struct iwl_priv * priv)677 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
678 {
679 unsigned long flags;
680 int i;
681
682 spin_lock_irqsave(&priv->sta_lock, flags);
683 for (i = 0; i < priv->hw_params.max_stations; i++) {
684 if (!(priv->stations[i].used & IWL_STA_BCAST))
685 continue;
686
687 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
688 priv->num_stations--;
689 BUG_ON(priv->num_stations < 0);
690 kfree(priv->stations[i].lq);
691 priv->stations[i].lq = NULL;
692 }
693 spin_unlock_irqrestore(&priv->sta_lock, flags);
694 }
695
696 #ifdef CONFIG_IWLWIFI_DEBUG
iwl_dump_lq_cmd(struct iwl_priv * priv,struct iwl_link_quality_cmd * lq)697 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
698 struct iwl_link_quality_cmd *lq)
699 {
700 int i;
701 IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
702 IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
703 lq->general_params.single_stream_ant_msk,
704 lq->general_params.dual_stream_ant_msk);
705
706 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
707 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
708 i, lq->rs_table[i].rate_n_flags);
709 }
710 #else
iwl_dump_lq_cmd(struct iwl_priv * priv,struct iwl_link_quality_cmd * lq)711 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
712 struct iwl_link_quality_cmd *lq)
713 {
714 }
715 #endif
716
717 /**
718 * is_lq_table_valid() - Test one aspect of LQ cmd for validity
719 *
720 * It sometimes happens when a HT rate has been in use and we
721 * loose connectivity with AP then mac80211 will first tell us that the
722 * current channel is not HT anymore before removing the station. In such a
723 * scenario the RXON flags will be updated to indicate we are not
724 * communicating HT anymore, but the LQ command may still contain HT rates.
725 * Test for this to prevent driver from sending LQ command between the time
726 * RXON flags are updated and when LQ command is updated.
727 */
is_lq_table_valid(struct iwl_priv * priv,struct iwl_rxon_context * ctx,struct iwl_link_quality_cmd * lq)728 static bool is_lq_table_valid(struct iwl_priv *priv,
729 struct iwl_rxon_context *ctx,
730 struct iwl_link_quality_cmd *lq)
731 {
732 int i;
733
734 if (ctx->ht.enabled)
735 return true;
736
737 IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
738 ctx->active.channel);
739 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
740 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
741 IWL_DEBUG_INFO(priv,
742 "index %d of LQ expects HT channel\n",
743 i);
744 return false;
745 }
746 }
747 return true;
748 }
749
750 /**
751 * iwl_send_lq_cmd() - Send link quality command
752 * @init: This command is sent as part of station initialization right
753 * after station has been added.
754 *
755 * The link quality command is sent as the last step of station creation.
756 * This is the special case in which init is set and we call a callback in
757 * this case to clear the state indicating that station creation is in
758 * progress.
759 */
iwl_send_lq_cmd(struct iwl_priv * priv,struct iwl_rxon_context * ctx,struct iwl_link_quality_cmd * lq,u8 flags,bool init)760 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
761 struct iwl_link_quality_cmd *lq, u8 flags, bool init)
762 {
763 int ret = 0;
764 unsigned long flags_spin;
765
766 struct iwl_host_cmd cmd = {
767 .id = REPLY_TX_LINK_QUALITY_CMD,
768 .len = sizeof(struct iwl_link_quality_cmd),
769 .flags = flags,
770 .data = lq,
771 };
772
773 if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
774 return -EINVAL;
775
776
777 spin_lock_irqsave(&priv->sta_lock, flags_spin);
778 if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
779 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
780 return -EINVAL;
781 }
782 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
783
784 iwl_dump_lq_cmd(priv, lq);
785 BUG_ON(init && (cmd.flags & CMD_ASYNC));
786
787 if (is_lq_table_valid(priv, ctx, lq))
788 ret = iwl_send_cmd(priv, &cmd);
789 else
790 ret = -EINVAL;
791
792 if (cmd.flags & CMD_ASYNC)
793 return ret;
794
795 if (init) {
796 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
797 lq->sta_id);
798 spin_lock_irqsave(&priv->sta_lock, flags_spin);
799 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
800 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
801 }
802 return ret;
803 }
804
iwl_mac_sta_remove(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta)805 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
806 struct ieee80211_vif *vif,
807 struct ieee80211_sta *sta)
808 {
809 struct iwl_priv *priv = hw->priv;
810 struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
811 int ret;
812
813 IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
814 sta->addr);
815 mutex_lock(&priv->mutex);
816 IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
817 sta->addr);
818 ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
819 if (ret)
820 IWL_ERR(priv, "Error removing station %pM\n",
821 sta->addr);
822 mutex_unlock(&priv->mutex);
823 return ret;
824 }
825