1 /******************************************************************************
2  *
3  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
4  * Copyright(c) 2015 Intel Deutschland GmbH
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of version 2 of the GNU General Public License as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  *
15  * You should have received a copy of the GNU General Public License along with
16  * this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18  *
19  * The full GNU General Public License is included in this distribution in the
20  * file called LICENSE.
21  *
22  * Contact Information:
23  * Intel Linux Wireless <linuxwifi@intel.com>
24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25  *
26  *****************************************************************************/
27 
28 #include <linux/etherdevice.h>
29 #include "iwl-trans.h"
30 #include "iwl-modparams.h"
31 #include "dev.h"
32 #include "agn.h"
33 #include "calib.h"
34 
35 /*
36  * initialize rxon structure with default values from eeprom
37  */
38 void iwl_connection_init_rx_config(struct iwl_priv *priv,
39 				   struct iwl_rxon_context *ctx)
40 {
41 	memset(&ctx->staging, 0, sizeof(ctx->staging));
42 
43 	if (!ctx->vif) {
44 		ctx->staging.dev_type = ctx->unused_devtype;
45 	} else
46 	switch (ctx->vif->type) {
47 	case NL80211_IFTYPE_AP:
48 		ctx->staging.dev_type = ctx->ap_devtype;
49 		break;
50 
51 	case NL80211_IFTYPE_STATION:
52 		ctx->staging.dev_type = ctx->station_devtype;
53 		ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
54 		break;
55 
56 	case NL80211_IFTYPE_ADHOC:
57 		ctx->staging.dev_type = ctx->ibss_devtype;
58 		ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
59 		ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
60 						  RXON_FILTER_ACCEPT_GRP_MSK;
61 		break;
62 
63 	case NL80211_IFTYPE_MONITOR:
64 		ctx->staging.dev_type = RXON_DEV_TYPE_SNIFFER;
65 		break;
66 
67 	default:
68 		IWL_ERR(priv, "Unsupported interface type %d\n",
69 			ctx->vif->type);
70 		break;
71 	}
72 
73 #if 0
74 	/* TODO:  Figure out when short_preamble would be set and cache from
75 	 * that */
76 	if (!hw_to_local(priv->hw)->short_preamble)
77 		ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
78 	else
79 		ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
80 #endif
81 
82 	ctx->staging.channel =
83 		cpu_to_le16(priv->hw->conf.chandef.chan->hw_value);
84 	priv->band = priv->hw->conf.chandef.chan->band;
85 
86 	iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
87 
88 	/* clear both MIX and PURE40 mode flag */
89 	ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
90 					RXON_FLG_CHANNEL_MODE_PURE_40);
91 	if (ctx->vif)
92 		memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
93 
94 	ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
95 	ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
96 	ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
97 }
98 
99 static int iwlagn_disable_bss(struct iwl_priv *priv,
100 			      struct iwl_rxon_context *ctx,
101 			      struct iwl_rxon_cmd *send)
102 {
103 	__le32 old_filter = send->filter_flags;
104 	int ret;
105 
106 	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
107 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
108 				0, sizeof(*send), send);
109 
110 	send->filter_flags = old_filter;
111 
112 	if (ret)
113 		IWL_DEBUG_QUIET_RFKILL(priv,
114 			"Error clearing ASSOC_MSK on BSS (%d)\n", ret);
115 
116 	return ret;
117 }
118 
119 static int iwlagn_disable_pan(struct iwl_priv *priv,
120 			      struct iwl_rxon_context *ctx,
121 			      struct iwl_rxon_cmd *send)
122 {
123 	struct iwl_notification_wait disable_wait;
124 	__le32 old_filter = send->filter_flags;
125 	u8 old_dev_type = send->dev_type;
126 	int ret;
127 	static const u16 deactivate_cmd[] = {
128 		REPLY_WIPAN_DEACTIVATION_COMPLETE
129 	};
130 
131 	iwl_init_notification_wait(&priv->notif_wait, &disable_wait,
132 				   deactivate_cmd, ARRAY_SIZE(deactivate_cmd),
133 				   NULL, NULL);
134 
135 	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
136 	send->dev_type = RXON_DEV_TYPE_P2P;
137 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
138 				0, sizeof(*send), send);
139 
140 	send->filter_flags = old_filter;
141 	send->dev_type = old_dev_type;
142 
143 	if (ret) {
144 		IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
145 		iwl_remove_notification(&priv->notif_wait, &disable_wait);
146 	} else {
147 		ret = iwl_wait_notification(&priv->notif_wait,
148 					    &disable_wait, HZ);
149 		if (ret)
150 			IWL_ERR(priv, "Timed out waiting for PAN disable\n");
151 	}
152 
153 	return ret;
154 }
155 
156 static int iwlagn_disconn_pan(struct iwl_priv *priv,
157 			      struct iwl_rxon_context *ctx,
158 			      struct iwl_rxon_cmd *send)
159 {
160 	__le32 old_filter = send->filter_flags;
161 	int ret;
162 
163 	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
164 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, 0,
165 				sizeof(*send), send);
166 
167 	send->filter_flags = old_filter;
168 
169 	return ret;
170 }
171 
172 static void iwlagn_update_qos(struct iwl_priv *priv,
173 			      struct iwl_rxon_context *ctx)
174 {
175 	int ret;
176 
177 	if (!ctx->is_active)
178 		return;
179 
180 	ctx->qos_data.def_qos_parm.qos_flags = 0;
181 
182 	if (ctx->qos_data.qos_active)
183 		ctx->qos_data.def_qos_parm.qos_flags |=
184 			QOS_PARAM_FLG_UPDATE_EDCA_MSK;
185 
186 	if (ctx->ht.enabled)
187 		ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
188 
189 	IWL_DEBUG_INFO(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
190 		      ctx->qos_data.qos_active,
191 		      ctx->qos_data.def_qos_parm.qos_flags);
192 
193 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->qos_cmd, 0,
194 			       sizeof(struct iwl_qosparam_cmd),
195 			       &ctx->qos_data.def_qos_parm);
196 	if (ret)
197 		IWL_DEBUG_QUIET_RFKILL(priv, "Failed to update QoS\n");
198 }
199 
200 static int iwlagn_update_beacon(struct iwl_priv *priv,
201 				struct ieee80211_vif *vif)
202 {
203 	lockdep_assert_held(&priv->mutex);
204 
205 	dev_kfree_skb(priv->beacon_skb);
206 	priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
207 	if (!priv->beacon_skb)
208 		return -ENOMEM;
209 	return iwlagn_send_beacon_cmd(priv);
210 }
211 
212 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
213 				  struct iwl_rxon_context *ctx)
214 {
215 	int ret = 0;
216 	struct iwl_rxon_assoc_cmd rxon_assoc;
217 	const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
218 	const struct iwl_rxon_cmd *rxon2 = &ctx->active;
219 
220 	if ((rxon1->flags == rxon2->flags) &&
221 	    (rxon1->filter_flags == rxon2->filter_flags) &&
222 	    (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
223 	    (rxon1->ofdm_ht_single_stream_basic_rates ==
224 	     rxon2->ofdm_ht_single_stream_basic_rates) &&
225 	    (rxon1->ofdm_ht_dual_stream_basic_rates ==
226 	     rxon2->ofdm_ht_dual_stream_basic_rates) &&
227 	    (rxon1->ofdm_ht_triple_stream_basic_rates ==
228 	     rxon2->ofdm_ht_triple_stream_basic_rates) &&
229 	    (rxon1->acquisition_data == rxon2->acquisition_data) &&
230 	    (rxon1->rx_chain == rxon2->rx_chain) &&
231 	    (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
232 		IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
233 		return 0;
234 	}
235 
236 	rxon_assoc.flags = ctx->staging.flags;
237 	rxon_assoc.filter_flags = ctx->staging.filter_flags;
238 	rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
239 	rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
240 	rxon_assoc.reserved1 = 0;
241 	rxon_assoc.reserved2 = 0;
242 	rxon_assoc.reserved3 = 0;
243 	rxon_assoc.ofdm_ht_single_stream_basic_rates =
244 	    ctx->staging.ofdm_ht_single_stream_basic_rates;
245 	rxon_assoc.ofdm_ht_dual_stream_basic_rates =
246 	    ctx->staging.ofdm_ht_dual_stream_basic_rates;
247 	rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
248 	rxon_assoc.ofdm_ht_triple_stream_basic_rates =
249 		 ctx->staging.ofdm_ht_triple_stream_basic_rates;
250 	rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
251 
252 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_assoc_cmd,
253 				CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
254 	return ret;
255 }
256 
257 static u16 iwl_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
258 {
259 	u16 new_val;
260 	u16 beacon_factor;
261 
262 	/*
263 	 * If mac80211 hasn't given us a beacon interval, program
264 	 * the default into the device (not checking this here
265 	 * would cause the adjustment below to return the maximum
266 	 * value, which may break PAN.)
267 	 */
268 	if (!beacon_val)
269 		return DEFAULT_BEACON_INTERVAL;
270 
271 	/*
272 	 * If the beacon interval we obtained from the peer
273 	 * is too large, we'll have to wake up more often
274 	 * (and in IBSS case, we'll beacon too much)
275 	 *
276 	 * For example, if max_beacon_val is 4096, and the
277 	 * requested beacon interval is 7000, we'll have to
278 	 * use 3500 to be able to wake up on the beacons.
279 	 *
280 	 * This could badly influence beacon detection stats.
281 	 */
282 
283 	beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
284 	new_val = beacon_val / beacon_factor;
285 
286 	if (!new_val)
287 		new_val = max_beacon_val;
288 
289 	return new_val;
290 }
291 
292 static int iwl_send_rxon_timing(struct iwl_priv *priv,
293 				struct iwl_rxon_context *ctx)
294 {
295 	u64 tsf;
296 	s32 interval_tm, rem;
297 	struct ieee80211_conf *conf = NULL;
298 	u16 beacon_int;
299 	struct ieee80211_vif *vif = ctx->vif;
300 
301 	conf = &priv->hw->conf;
302 
303 	lockdep_assert_held(&priv->mutex);
304 
305 	memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));
306 
307 	ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
308 	ctx->timing.listen_interval = cpu_to_le16(conf->listen_interval);
309 
310 	beacon_int = vif ? vif->bss_conf.beacon_int : 0;
311 
312 	/*
313 	 * TODO: For IBSS we need to get atim_window from mac80211,
314 	 *	 for now just always use 0
315 	 */
316 	ctx->timing.atim_window = 0;
317 
318 	if (ctx->ctxid == IWL_RXON_CTX_PAN &&
319 	    (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
320 	    iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
321 	    priv->contexts[IWL_RXON_CTX_BSS].vif &&
322 	    priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
323 		ctx->timing.beacon_interval =
324 			priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
325 		beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
326 	} else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
327 		   iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
328 		   priv->contexts[IWL_RXON_CTX_PAN].vif &&
329 		   priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
330 		   (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
331 		    !ctx->vif->bss_conf.beacon_int)) {
332 		ctx->timing.beacon_interval =
333 			priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
334 		beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
335 	} else {
336 		beacon_int = iwl_adjust_beacon_interval(beacon_int,
337 			IWL_MAX_UCODE_BEACON_INTERVAL * TIME_UNIT);
338 		ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
339 	}
340 
341 	ctx->beacon_int = beacon_int;
342 
343 	tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
344 	interval_tm = beacon_int * TIME_UNIT;
345 	rem = do_div(tsf, interval_tm);
346 	ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
347 
348 	ctx->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ?: 1) : 1;
349 
350 	IWL_DEBUG_ASSOC(priv,
351 			"beacon interval %d beacon timer %d beacon tim %d\n",
352 			le16_to_cpu(ctx->timing.beacon_interval),
353 			le32_to_cpu(ctx->timing.beacon_init_val),
354 			le16_to_cpu(ctx->timing.atim_window));
355 
356 	return iwl_dvm_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
357 				0, sizeof(ctx->timing), &ctx->timing);
358 }
359 
360 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
361 			       struct iwl_rxon_context *ctx)
362 {
363 	int ret;
364 	struct iwl_rxon_cmd *active = (void *)&ctx->active;
365 
366 	if (ctx->ctxid == IWL_RXON_CTX_BSS) {
367 		ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
368 	} else {
369 		ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
370 		if (ret)
371 			return ret;
372 		if (ctx->vif) {
373 			ret = iwl_send_rxon_timing(priv, ctx);
374 			if (ret) {
375 				IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
376 				return ret;
377 			}
378 			ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
379 		}
380 	}
381 	if (ret)
382 		return ret;
383 
384 	/*
385 	 * Un-assoc RXON clears the station table and WEP
386 	 * keys, so we have to restore those afterwards.
387 	 */
388 	iwl_clear_ucode_stations(priv, ctx);
389 	/* update -- might need P2P now */
390 	iwl_update_bcast_station(priv, ctx);
391 	iwl_restore_stations(priv, ctx);
392 	ret = iwl_restore_default_wep_keys(priv, ctx);
393 	if (ret) {
394 		IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
395 		return ret;
396 	}
397 
398 	memcpy(active, &ctx->staging, sizeof(*active));
399 	return 0;
400 }
401 
402 static int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
403 {
404 	int ret;
405 	s8 prev_tx_power;
406 	bool defer;
407 	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
408 
409 	if (priv->calib_disabled & IWL_TX_POWER_CALIB_DISABLED)
410 		return 0;
411 
412 	lockdep_assert_held(&priv->mutex);
413 
414 	if (priv->tx_power_user_lmt == tx_power && !force)
415 		return 0;
416 
417 	if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
418 		IWL_WARN(priv,
419 			 "Requested user TXPOWER %d below lower limit %d.\n",
420 			 tx_power,
421 			 IWLAGN_TX_POWER_TARGET_POWER_MIN);
422 		return -EINVAL;
423 	}
424 
425 	if (tx_power > DIV_ROUND_UP(priv->nvm_data->max_tx_pwr_half_dbm, 2)) {
426 		IWL_WARN(priv,
427 			"Requested user TXPOWER %d above upper limit %d.\n",
428 			 tx_power, priv->nvm_data->max_tx_pwr_half_dbm);
429 		return -EINVAL;
430 	}
431 
432 	if (!iwl_is_ready_rf(priv))
433 		return -EIO;
434 
435 	/* scan complete and commit_rxon use tx_power_next value,
436 	 * it always need to be updated for newest request */
437 	priv->tx_power_next = tx_power;
438 
439 	/* do not set tx power when scanning or channel changing */
440 	defer = test_bit(STATUS_SCANNING, &priv->status) ||
441 		memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
442 	if (defer && !force) {
443 		IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
444 		return 0;
445 	}
446 
447 	prev_tx_power = priv->tx_power_user_lmt;
448 	priv->tx_power_user_lmt = tx_power;
449 
450 	ret = iwlagn_send_tx_power(priv);
451 
452 	/* if fail to set tx_power, restore the orig. tx power */
453 	if (ret) {
454 		priv->tx_power_user_lmt = prev_tx_power;
455 		priv->tx_power_next = prev_tx_power;
456 	}
457 	return ret;
458 }
459 
460 static int iwlagn_rxon_connect(struct iwl_priv *priv,
461 			       struct iwl_rxon_context *ctx)
462 {
463 	int ret;
464 	struct iwl_rxon_cmd *active = (void *)&ctx->active;
465 
466 	/* RXON timing must be before associated RXON */
467 	if (ctx->ctxid == IWL_RXON_CTX_BSS) {
468 		ret = iwl_send_rxon_timing(priv, ctx);
469 		if (ret) {
470 			IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
471 			return ret;
472 		}
473 	}
474 	/* QoS info may be cleared by previous un-assoc RXON */
475 	iwlagn_update_qos(priv, ctx);
476 
477 	/*
478 	 * We'll run into this code path when beaconing is
479 	 * enabled, but then we also need to send the beacon
480 	 * to the device.
481 	 */
482 	if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
483 		ret = iwlagn_update_beacon(priv, ctx->vif);
484 		if (ret) {
485 			IWL_ERR(priv,
486 				"Error sending required beacon (%d)!\n",
487 				ret);
488 			return ret;
489 		}
490 	}
491 
492 	priv->start_calib = 0;
493 	/*
494 	 * Apply the new configuration.
495 	 *
496 	 * Associated RXON doesn't clear the station table in uCode,
497 	 * so we don't need to restore stations etc. after this.
498 	 */
499 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, 0,
500 		      sizeof(struct iwl_rxon_cmd), &ctx->staging);
501 	if (ret) {
502 		IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
503 		return ret;
504 	}
505 	memcpy(active, &ctx->staging, sizeof(*active));
506 
507 	/* IBSS beacon needs to be sent after setting assoc */
508 	if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
509 		if (iwlagn_update_beacon(priv, ctx->vif))
510 			IWL_ERR(priv, "Error sending IBSS beacon\n");
511 	iwl_init_sensitivity(priv);
512 
513 	/*
514 	 * If we issue a new RXON command which required a tune then
515 	 * we must send a new TXPOWER command or we won't be able to
516 	 * Tx any frames.
517 	 *
518 	 * It's expected we set power here if channel is changing.
519 	 */
520 	ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
521 	if (ret) {
522 		IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
523 		return ret;
524 	}
525 
526 	return 0;
527 }
528 
529 int iwlagn_set_pan_params(struct iwl_priv *priv)
530 {
531 	struct iwl_wipan_params_cmd cmd;
532 	struct iwl_rxon_context *ctx_bss, *ctx_pan;
533 	int slot0 = 300, slot1 = 0;
534 	int ret;
535 
536 	if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
537 		return 0;
538 
539 	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
540 
541 	lockdep_assert_held(&priv->mutex);
542 
543 	ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
544 	ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
545 
546 	/*
547 	 * If the PAN context is inactive, then we don't need
548 	 * to update the PAN parameters, the last thing we'll
549 	 * have done before it goes inactive is making the PAN
550 	 * parameters be WLAN-only.
551 	 */
552 	if (!ctx_pan->is_active)
553 		return 0;
554 
555 	memset(&cmd, 0, sizeof(cmd));
556 
557 	/* only 2 slots are currently allowed */
558 	cmd.num_slots = 2;
559 
560 	cmd.slots[0].type = 0; /* BSS */
561 	cmd.slots[1].type = 1; /* PAN */
562 
563 	if (ctx_bss->vif && ctx_pan->vif) {
564 		int bcnint = ctx_pan->beacon_int;
565 		int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
566 
567 		/* should be set, but seems unused?? */
568 		cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
569 
570 		if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
571 		    bcnint &&
572 		    bcnint != ctx_bss->beacon_int) {
573 			IWL_ERR(priv,
574 				"beacon intervals don't match (%d, %d)\n",
575 				ctx_bss->beacon_int, ctx_pan->beacon_int);
576 		} else
577 			bcnint = max_t(int, bcnint,
578 				       ctx_bss->beacon_int);
579 		if (!bcnint)
580 			bcnint = DEFAULT_BEACON_INTERVAL;
581 		slot0 = bcnint / 2;
582 		slot1 = bcnint - slot0;
583 
584 		if (test_bit(STATUS_SCAN_HW, &priv->status) ||
585 		    (!ctx_bss->vif->bss_conf.idle &&
586 		     !ctx_bss->vif->bss_conf.assoc)) {
587 			slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
588 			slot1 = IWL_MIN_SLOT_TIME;
589 		} else if (!ctx_pan->vif->bss_conf.idle &&
590 			   !ctx_pan->vif->bss_conf.assoc) {
591 			slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
592 			slot0 = IWL_MIN_SLOT_TIME;
593 		}
594 	} else if (ctx_pan->vif) {
595 		slot0 = 0;
596 		slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
597 					ctx_pan->beacon_int;
598 		slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
599 
600 		if (test_bit(STATUS_SCAN_HW, &priv->status)) {
601 			slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
602 			slot1 = IWL_MIN_SLOT_TIME;
603 		}
604 	}
605 
606 	cmd.slots[0].width = cpu_to_le16(slot0);
607 	cmd.slots[1].width = cpu_to_le16(slot1);
608 
609 	ret = iwl_dvm_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, 0,
610 			sizeof(cmd), &cmd);
611 	if (ret)
612 		IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
613 
614 	return ret;
615 }
616 
617 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
618 			     struct iwl_ht_config *ht_conf,
619 			     struct iwl_rxon_context *ctx)
620 {
621 	struct iwl_rxon_cmd *rxon = &ctx->staging;
622 
623 	if (!ctx->ht.enabled) {
624 		rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
625 			RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
626 			RXON_FLG_HT40_PROT_MSK |
627 			RXON_FLG_HT_PROT_MSK);
628 		return;
629 	}
630 
631 	/* FIXME: if the definition of ht.protection changed, the "translation"
632 	 * will be needed for rxon->flags
633 	 */
634 	rxon->flags |= cpu_to_le32(ctx->ht.protection <<
635 				   RXON_FLG_HT_OPERATING_MODE_POS);
636 
637 	/* Set up channel bandwidth:
638 	 * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
639 	/* clear the HT channel mode before set the mode */
640 	rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
641 			 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
642 	if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
643 		/* pure ht40 */
644 		if (ctx->ht.protection ==
645 		    IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
646 			rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
647 			/*
648 			 * Note: control channel is opposite of extension
649 			 * channel
650 			 */
651 			switch (ctx->ht.extension_chan_offset) {
652 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
653 				rxon->flags &=
654 					~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
655 				break;
656 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
657 				rxon->flags |=
658 					RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
659 				break;
660 			}
661 		} else {
662 			/*
663 			 * Note: control channel is opposite of extension
664 			 * channel
665 			 */
666 			switch (ctx->ht.extension_chan_offset) {
667 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
668 				rxon->flags &=
669 					~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
670 				rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
671 				break;
672 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
673 				rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
674 				rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
675 				break;
676 			case IEEE80211_HT_PARAM_CHA_SEC_NONE:
677 			default:
678 				/*
679 				 * channel location only valid if in Mixed
680 				 * mode
681 				 */
682 				IWL_ERR(priv,
683 					"invalid extension channel offset\n");
684 				break;
685 			}
686 		}
687 	} else {
688 		rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
689 	}
690 
691 	iwlagn_set_rxon_chain(priv, ctx);
692 
693 	IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
694 			"extension channel offset 0x%x\n",
695 			le32_to_cpu(rxon->flags), ctx->ht.protection,
696 			ctx->ht.extension_chan_offset);
697 }
698 
699 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
700 {
701 	struct iwl_rxon_context *ctx;
702 
703 	for_each_context(priv, ctx)
704 		_iwl_set_rxon_ht(priv, ht_conf, ctx);
705 }
706 
707 /**
708  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
709  * @ch: requested channel as a pointer to struct ieee80211_channel
710 
711  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
712  * in the staging RXON flag structure based on the ch->band
713  */
714 void iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
715 			 struct iwl_rxon_context *ctx)
716 {
717 	enum nl80211_band band = ch->band;
718 	u16 channel = ch->hw_value;
719 
720 	if ((le16_to_cpu(ctx->staging.channel) == channel) &&
721 	    (priv->band == band))
722 		return;
723 
724 	ctx->staging.channel = cpu_to_le16(channel);
725 	if (band == NL80211_BAND_5GHZ)
726 		ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
727 	else
728 		ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
729 
730 	priv->band = band;
731 
732 	IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
733 
734 }
735 
736 void iwl_set_flags_for_band(struct iwl_priv *priv,
737 			    struct iwl_rxon_context *ctx,
738 			    enum nl80211_band band,
739 			    struct ieee80211_vif *vif)
740 {
741 	if (band == NL80211_BAND_5GHZ) {
742 		ctx->staging.flags &=
743 		    ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
744 		      | RXON_FLG_CCK_MSK);
745 		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
746 	} else {
747 		/* Copied from iwl_post_associate() */
748 		if (vif && vif->bss_conf.use_short_slot)
749 			ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
750 		else
751 			ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
752 
753 		ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
754 		ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
755 		ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
756 	}
757 }
758 
759 static void iwl_set_rxon_hwcrypto(struct iwl_priv *priv,
760 				  struct iwl_rxon_context *ctx, int hw_decrypt)
761 {
762 	struct iwl_rxon_cmd *rxon = &ctx->staging;
763 
764 	if (hw_decrypt)
765 		rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
766 	else
767 		rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
768 
769 }
770 
771 /* validate RXON structure is valid */
772 static int iwl_check_rxon_cmd(struct iwl_priv *priv,
773 			      struct iwl_rxon_context *ctx)
774 {
775 	struct iwl_rxon_cmd *rxon = &ctx->staging;
776 	u32 errors = 0;
777 
778 	if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
779 		if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
780 			IWL_WARN(priv, "check 2.4G: wrong narrow\n");
781 			errors |= BIT(0);
782 		}
783 		if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
784 			IWL_WARN(priv, "check 2.4G: wrong radar\n");
785 			errors |= BIT(1);
786 		}
787 	} else {
788 		if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
789 			IWL_WARN(priv, "check 5.2G: not short slot!\n");
790 			errors |= BIT(2);
791 		}
792 		if (rxon->flags & RXON_FLG_CCK_MSK) {
793 			IWL_WARN(priv, "check 5.2G: CCK!\n");
794 			errors |= BIT(3);
795 		}
796 	}
797 	if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
798 		IWL_WARN(priv, "mac/bssid mcast!\n");
799 		errors |= BIT(4);
800 	}
801 
802 	/* make sure basic rates 6Mbps and 1Mbps are supported */
803 	if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
804 	    (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
805 		IWL_WARN(priv, "neither 1 nor 6 are basic\n");
806 		errors |= BIT(5);
807 	}
808 
809 	if (le16_to_cpu(rxon->assoc_id) > 2007) {
810 		IWL_WARN(priv, "aid > 2007\n");
811 		errors |= BIT(6);
812 	}
813 
814 	if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
815 			== (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
816 		IWL_WARN(priv, "CCK and short slot\n");
817 		errors |= BIT(7);
818 	}
819 
820 	if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
821 			== (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
822 		IWL_WARN(priv, "CCK and auto detect\n");
823 		errors |= BIT(8);
824 	}
825 
826 	if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
827 			    RXON_FLG_TGG_PROTECT_MSK)) ==
828 			    RXON_FLG_TGG_PROTECT_MSK) {
829 		IWL_WARN(priv, "TGg but no auto-detect\n");
830 		errors |= BIT(9);
831 	}
832 
833 	if (rxon->channel == 0) {
834 		IWL_WARN(priv, "zero channel is invalid\n");
835 		errors |= BIT(10);
836 	}
837 
838 	WARN(errors, "Invalid RXON (%#x), channel %d",
839 	     errors, le16_to_cpu(rxon->channel));
840 
841 	return errors ? -EINVAL : 0;
842 }
843 
844 /**
845  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
846  * @priv: staging_rxon is compared to active_rxon
847  *
848  * If the RXON structure is changing enough to require a new tune,
849  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
850  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
851  */
852 static int iwl_full_rxon_required(struct iwl_priv *priv,
853 				  struct iwl_rxon_context *ctx)
854 {
855 	const struct iwl_rxon_cmd *staging = &ctx->staging;
856 	const struct iwl_rxon_cmd *active = &ctx->active;
857 
858 #define CHK(cond)							\
859 	if ((cond)) {							\
860 		IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");	\
861 		return 1;						\
862 	}
863 
864 #define CHK_NEQ(c1, c2)						\
865 	if ((c1) != (c2)) {					\
866 		IWL_DEBUG_INFO(priv, "need full RXON - "	\
867 			       #c1 " != " #c2 " - %d != %d\n",	\
868 			       (c1), (c2));			\
869 		return 1;					\
870 	}
871 
872 	/* These items are only settable from the full RXON command */
873 	CHK(!iwl_is_associated_ctx(ctx));
874 	CHK(!ether_addr_equal(staging->bssid_addr, active->bssid_addr));
875 	CHK(!ether_addr_equal(staging->node_addr, active->node_addr));
876 	CHK(!ether_addr_equal(staging->wlap_bssid_addr,
877 			      active->wlap_bssid_addr));
878 	CHK_NEQ(staging->dev_type, active->dev_type);
879 	CHK_NEQ(staging->channel, active->channel);
880 	CHK_NEQ(staging->air_propagation, active->air_propagation);
881 	CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
882 		active->ofdm_ht_single_stream_basic_rates);
883 	CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
884 		active->ofdm_ht_dual_stream_basic_rates);
885 	CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
886 		active->ofdm_ht_triple_stream_basic_rates);
887 	CHK_NEQ(staging->assoc_id, active->assoc_id);
888 
889 	/* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
890 	 * be updated with the RXON_ASSOC command -- however only some
891 	 * flag transitions are allowed using RXON_ASSOC */
892 
893 	/* Check if we are not switching bands */
894 	CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
895 		active->flags & RXON_FLG_BAND_24G_MSK);
896 
897 	/* Check if we are switching association toggle */
898 	CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
899 		active->filter_flags & RXON_FILTER_ASSOC_MSK);
900 
901 #undef CHK
902 #undef CHK_NEQ
903 
904 	return 0;
905 }
906 
907 #ifdef CONFIG_IWLWIFI_DEBUG
908 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
909 			     enum iwl_rxon_context_id ctxid)
910 {
911 	struct iwl_rxon_context *ctx = &priv->contexts[ctxid];
912 	struct iwl_rxon_cmd *rxon = &ctx->staging;
913 
914 	IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
915 	iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
916 	IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n",
917 			le16_to_cpu(rxon->channel));
918 	IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n",
919 			le32_to_cpu(rxon->flags));
920 	IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
921 			le32_to_cpu(rxon->filter_flags));
922 	IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
923 	IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
924 			rxon->ofdm_basic_rates);
925 	IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n",
926 			rxon->cck_basic_rates);
927 	IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
928 	IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
929 	IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n",
930 			le16_to_cpu(rxon->assoc_id));
931 }
932 #endif
933 
934 static void iwl_calc_basic_rates(struct iwl_priv *priv,
935 				 struct iwl_rxon_context *ctx)
936 {
937 	int lowest_present_ofdm = 100;
938 	int lowest_present_cck = 100;
939 	u8 cck = 0;
940 	u8 ofdm = 0;
941 
942 	if (ctx->vif) {
943 		struct ieee80211_supported_band *sband;
944 		unsigned long basic = ctx->vif->bss_conf.basic_rates;
945 		int i;
946 
947 		sband = priv->hw->wiphy->bands[priv->hw->conf.chandef.chan->band];
948 
949 		for_each_set_bit(i, &basic, BITS_PER_LONG) {
950 			int hw = sband->bitrates[i].hw_value;
951 			if (hw >= IWL_FIRST_OFDM_RATE) {
952 				ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
953 				if (lowest_present_ofdm > hw)
954 					lowest_present_ofdm = hw;
955 			} else {
956 				BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
957 
958 				cck |= BIT(hw);
959 				if (lowest_present_cck > hw)
960 					lowest_present_cck = hw;
961 			}
962 		}
963 	}
964 
965 	/*
966 	 * Now we've got the basic rates as bitmaps in the ofdm and cck
967 	 * variables. This isn't sufficient though, as there might not
968 	 * be all the right rates in the bitmap. E.g. if the only basic
969 	 * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
970 	 * and 6 Mbps because the 802.11-2007 standard says in 9.6:
971 	 *
972 	 *    [...] a STA responding to a received frame shall transmit
973 	 *    its Control Response frame [...] at the highest rate in the
974 	 *    BSSBasicRateSet parameter that is less than or equal to the
975 	 *    rate of the immediately previous frame in the frame exchange
976 	 *    sequence ([...]) and that is of the same modulation class
977 	 *    ([...]) as the received frame. If no rate contained in the
978 	 *    BSSBasicRateSet parameter meets these conditions, then the
979 	 *    control frame sent in response to a received frame shall be
980 	 *    transmitted at the highest mandatory rate of the PHY that is
981 	 *    less than or equal to the rate of the received frame, and
982 	 *    that is of the same modulation class as the received frame.
983 	 *
984 	 * As a consequence, we need to add all mandatory rates that are
985 	 * lower than all of the basic rates to these bitmaps.
986 	 */
987 
988 	if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
989 		ofdm |= IWL_RATE_24M_MASK >> IWL_FIRST_OFDM_RATE;
990 	if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
991 		ofdm |= IWL_RATE_12M_MASK >> IWL_FIRST_OFDM_RATE;
992 	/* 6M already there or needed so always add */
993 	ofdm |= IWL_RATE_6M_MASK >> IWL_FIRST_OFDM_RATE;
994 
995 	/*
996 	 * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
997 	 * Note, however:
998 	 *  - if no CCK rates are basic, it must be ERP since there must
999 	 *    be some basic rates at all, so they're OFDM => ERP PHY
1000 	 *    (or we're in 5 GHz, and the cck bitmap will never be used)
1001 	 *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
1002 	 *  - if 5.5M is basic, 1M and 2M are mandatory
1003 	 *  - if 2M is basic, 1M is mandatory
1004 	 *  - if 1M is basic, that's the only valid ACK rate.
1005 	 * As a consequence, it's not as complicated as it sounds, just add
1006 	 * any lower rates to the ACK rate bitmap.
1007 	 */
1008 	if (IWL_RATE_11M_INDEX < lowest_present_cck)
1009 		cck |= IWL_RATE_11M_MASK >> IWL_FIRST_CCK_RATE;
1010 	if (IWL_RATE_5M_INDEX < lowest_present_cck)
1011 		cck |= IWL_RATE_5M_MASK >> IWL_FIRST_CCK_RATE;
1012 	if (IWL_RATE_2M_INDEX < lowest_present_cck)
1013 		cck |= IWL_RATE_2M_MASK >> IWL_FIRST_CCK_RATE;
1014 	/* 1M already there or needed so always add */
1015 	cck |= IWL_RATE_1M_MASK >> IWL_FIRST_CCK_RATE;
1016 
1017 	IWL_DEBUG_RATE(priv, "Set basic rates cck:0x%.2x ofdm:0x%.2x\n",
1018 		       cck, ofdm);
1019 
1020 	/* "basic_rates" is a misnomer here -- should be called ACK rates */
1021 	ctx->staging.cck_basic_rates = cck;
1022 	ctx->staging.ofdm_basic_rates = ofdm;
1023 }
1024 
1025 /**
1026  * iwlagn_commit_rxon - commit staging_rxon to hardware
1027  *
1028  * The RXON command in staging_rxon is committed to the hardware and
1029  * the active_rxon structure is updated with the new data.  This
1030  * function correctly transitions out of the RXON_ASSOC_MSK state if
1031  * a HW tune is required based on the RXON structure changes.
1032  *
1033  * The connect/disconnect flow should be as the following:
1034  *
1035  * 1. make sure send RXON command with association bit unset if not connect
1036  *	this should include the channel and the band for the candidate
1037  *	to be connected to
1038  * 2. Add Station before RXON association with the AP
1039  * 3. RXON_timing has to send before RXON for connection
1040  * 4. full RXON command - associated bit set
1041  * 5. use RXON_ASSOC command to update any flags changes
1042  */
1043 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
1044 {
1045 	/* cast away the const for active_rxon in this function */
1046 	struct iwl_rxon_cmd *active = (void *)&ctx->active;
1047 	bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
1048 	int ret;
1049 
1050 	lockdep_assert_held(&priv->mutex);
1051 
1052 	if (!iwl_is_alive(priv))
1053 		return -EBUSY;
1054 
1055 	/* This function hardcodes a bunch of dual-mode assumptions */
1056 	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
1057 
1058 	if (!ctx->is_active)
1059 		return 0;
1060 
1061 	/* always get timestamp with Rx frame */
1062 	ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
1063 
1064 	/* recalculate basic rates */
1065 	iwl_calc_basic_rates(priv, ctx);
1066 
1067 	/*
1068 	 * force CTS-to-self frames protection if RTS-CTS is not preferred
1069 	 * one aggregation protection method
1070 	 */
1071 	if (!priv->hw_params.use_rts_for_aggregation)
1072 		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1073 
1074 	if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
1075 	    !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
1076 		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
1077 	else
1078 		ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
1079 
1080 	iwl_print_rx_config_cmd(priv, ctx->ctxid);
1081 	ret = iwl_check_rxon_cmd(priv, ctx);
1082 	if (ret) {
1083 		IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
1084 		return -EINVAL;
1085 	}
1086 
1087 	/*
1088 	 * receive commit_rxon request
1089 	 * abort any previous channel switch if still in process
1090 	 */
1091 	if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
1092 	    (priv->switch_channel != ctx->staging.channel)) {
1093 		IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
1094 			      le16_to_cpu(priv->switch_channel));
1095 		iwl_chswitch_done(priv, false);
1096 	}
1097 
1098 	/*
1099 	 * If we don't need to send a full RXON, we can use
1100 	 * iwl_rxon_assoc_cmd which is used to reconfigure filter
1101 	 * and other flags for the current radio configuration.
1102 	 */
1103 	if (!iwl_full_rxon_required(priv, ctx)) {
1104 		ret = iwlagn_send_rxon_assoc(priv, ctx);
1105 		if (ret) {
1106 			IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
1107 			return ret;
1108 		}
1109 
1110 		memcpy(active, &ctx->staging, sizeof(*active));
1111 		/*
1112 		 * We do not commit tx power settings while channel changing,
1113 		 * do it now if after settings changed.
1114 		 */
1115 		iwl_set_tx_power(priv, priv->tx_power_next, false);
1116 
1117 		/* make sure we are in the right PS state */
1118 		iwl_power_update_mode(priv, true);
1119 
1120 		return 0;
1121 	}
1122 
1123 	iwl_set_rxon_hwcrypto(priv, ctx, !iwlwifi_mod_params.swcrypto);
1124 
1125 	IWL_DEBUG_INFO(priv,
1126 		       "Going to commit RXON\n"
1127 		       "  * with%s RXON_FILTER_ASSOC_MSK\n"
1128 		       "  * channel = %d\n"
1129 		       "  * bssid = %pM\n",
1130 		       (new_assoc ? "" : "out"),
1131 		       le16_to_cpu(ctx->staging.channel),
1132 		       ctx->staging.bssid_addr);
1133 
1134 	/*
1135 	 * Always clear associated first, but with the correct config.
1136 	 * This is required as for example station addition for the
1137 	 * AP station must be done after the BSSID is set to correctly
1138 	 * set up filters in the device.
1139 	 */
1140 	ret = iwlagn_rxon_disconn(priv, ctx);
1141 	if (ret)
1142 		return ret;
1143 
1144 	ret = iwlagn_set_pan_params(priv);
1145 	if (ret)
1146 		return ret;
1147 
1148 	if (new_assoc)
1149 		return iwlagn_rxon_connect(priv, ctx);
1150 
1151 	return 0;
1152 }
1153 
1154 void iwlagn_config_ht40(struct ieee80211_conf *conf,
1155 			struct iwl_rxon_context *ctx)
1156 {
1157 	if (conf_is_ht40_minus(conf)) {
1158 		ctx->ht.extension_chan_offset =
1159 			IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1160 		ctx->ht.is_40mhz = true;
1161 	} else if (conf_is_ht40_plus(conf)) {
1162 		ctx->ht.extension_chan_offset =
1163 			IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1164 		ctx->ht.is_40mhz = true;
1165 	} else {
1166 		ctx->ht.extension_chan_offset =
1167 			IEEE80211_HT_PARAM_CHA_SEC_NONE;
1168 		ctx->ht.is_40mhz = false;
1169 	}
1170 }
1171 
1172 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
1173 {
1174 	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1175 	struct iwl_rxon_context *ctx;
1176 	struct ieee80211_conf *conf = &hw->conf;
1177 	struct ieee80211_channel *channel = conf->chandef.chan;
1178 	int ret = 0;
1179 
1180 	IWL_DEBUG_MAC80211(priv, "enter: changed %#x\n", changed);
1181 
1182 	mutex_lock(&priv->mutex);
1183 
1184 	if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
1185 		IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
1186 		goto out;
1187 	}
1188 
1189 	if (!iwl_is_ready(priv)) {
1190 		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1191 		goto out;
1192 	}
1193 
1194 	if (changed & (IEEE80211_CONF_CHANGE_SMPS |
1195 		       IEEE80211_CONF_CHANGE_CHANNEL)) {
1196 		/* mac80211 uses static for non-HT which is what we want */
1197 		priv->current_ht_config.smps = conf->smps_mode;
1198 
1199 		/*
1200 		 * Recalculate chain counts.
1201 		 *
1202 		 * If monitor mode is enabled then mac80211 will
1203 		 * set up the SM PS mode to OFF if an HT channel is
1204 		 * configured.
1205 		 */
1206 		for_each_context(priv, ctx)
1207 			iwlagn_set_rxon_chain(priv, ctx);
1208 	}
1209 
1210 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
1211 		for_each_context(priv, ctx) {
1212 			/* Configure HT40 channels */
1213 			if (ctx->ht.enabled != conf_is_ht(conf))
1214 				ctx->ht.enabled = conf_is_ht(conf);
1215 
1216 			if (ctx->ht.enabled) {
1217 				/* if HT40 is used, it should not change
1218 				 * after associated except channel switch */
1219 				if (!ctx->ht.is_40mhz ||
1220 						!iwl_is_associated_ctx(ctx))
1221 					iwlagn_config_ht40(conf, ctx);
1222 			} else
1223 				ctx->ht.is_40mhz = false;
1224 
1225 			/*
1226 			 * Default to no protection. Protection mode will
1227 			 * later be set from BSS config in iwl_ht_conf
1228 			 */
1229 			ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
1230 
1231 			/* if we are switching from ht to 2.4 clear flags
1232 			 * from any ht related info since 2.4 does not
1233 			 * support ht */
1234 			if (le16_to_cpu(ctx->staging.channel) !=
1235 			    channel->hw_value)
1236 				ctx->staging.flags = 0;
1237 
1238 			iwl_set_rxon_channel(priv, channel, ctx);
1239 			iwl_set_rxon_ht(priv, &priv->current_ht_config);
1240 
1241 			iwl_set_flags_for_band(priv, ctx, channel->band,
1242 					       ctx->vif);
1243 		}
1244 
1245 		iwl_update_bcast_stations(priv);
1246 	}
1247 
1248 	if (changed & (IEEE80211_CONF_CHANGE_PS |
1249 			IEEE80211_CONF_CHANGE_IDLE)) {
1250 		ret = iwl_power_update_mode(priv, false);
1251 		if (ret)
1252 			IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
1253 	}
1254 
1255 	if (changed & IEEE80211_CONF_CHANGE_POWER) {
1256 		IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
1257 			priv->tx_power_user_lmt, conf->power_level);
1258 
1259 		iwl_set_tx_power(priv, conf->power_level, false);
1260 	}
1261 
1262 	for_each_context(priv, ctx) {
1263 		if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1264 			continue;
1265 		iwlagn_commit_rxon(priv, ctx);
1266 	}
1267  out:
1268 	mutex_unlock(&priv->mutex);
1269 	IWL_DEBUG_MAC80211(priv, "leave\n");
1270 
1271 	return ret;
1272 }
1273 
1274 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
1275 				       struct iwl_rxon_context *ctx,
1276 				       struct ieee80211_bss_conf *bss_conf)
1277 {
1278 	struct ieee80211_vif *vif = ctx->vif;
1279 	struct iwl_rxon_context *tmp;
1280 	struct ieee80211_sta *sta;
1281 	struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1282 	struct ieee80211_sta_ht_cap *ht_cap;
1283 	bool need_multiple;
1284 
1285 	lockdep_assert_held(&priv->mutex);
1286 
1287 	switch (vif->type) {
1288 	case NL80211_IFTYPE_STATION:
1289 		rcu_read_lock();
1290 		sta = ieee80211_find_sta(vif, bss_conf->bssid);
1291 		if (!sta) {
1292 			/*
1293 			 * If at all, this can only happen through a race
1294 			 * when the AP disconnects us while we're still
1295 			 * setting up the connection, in that case mac80211
1296 			 * will soon tell us about that.
1297 			 */
1298 			need_multiple = false;
1299 			rcu_read_unlock();
1300 			break;
1301 		}
1302 
1303 		ht_cap = &sta->ht_cap;
1304 
1305 		need_multiple = true;
1306 
1307 		/*
1308 		 * If the peer advertises no support for receiving 2 and 3
1309 		 * stream MCS rates, it can't be transmitting them either.
1310 		 */
1311 		if (ht_cap->mcs.rx_mask[1] == 0 &&
1312 		    ht_cap->mcs.rx_mask[2] == 0) {
1313 			need_multiple = false;
1314 		} else if (!(ht_cap->mcs.tx_params &
1315 						IEEE80211_HT_MCS_TX_DEFINED)) {
1316 			/* If it can't TX MCS at all ... */
1317 			need_multiple = false;
1318 		} else if (ht_cap->mcs.tx_params &
1319 						IEEE80211_HT_MCS_TX_RX_DIFF) {
1320 			int maxstreams;
1321 
1322 			/*
1323 			 * But if it can receive them, it might still not
1324 			 * be able to transmit them, which is what we need
1325 			 * to check here -- so check the number of streams
1326 			 * it advertises for TX (if different from RX).
1327 			 */
1328 
1329 			maxstreams = (ht_cap->mcs.tx_params &
1330 				 IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
1331 			maxstreams >>=
1332 				IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
1333 			maxstreams += 1;
1334 
1335 			if (maxstreams <= 1)
1336 				need_multiple = false;
1337 		}
1338 
1339 		rcu_read_unlock();
1340 		break;
1341 	case NL80211_IFTYPE_ADHOC:
1342 		/* currently */
1343 		need_multiple = false;
1344 		break;
1345 	default:
1346 		/* only AP really */
1347 		need_multiple = true;
1348 		break;
1349 	}
1350 
1351 	ctx->ht_need_multiple_chains = need_multiple;
1352 
1353 	if (!need_multiple) {
1354 		/* check all contexts */
1355 		for_each_context(priv, tmp) {
1356 			if (!tmp->vif)
1357 				continue;
1358 			if (tmp->ht_need_multiple_chains) {
1359 				need_multiple = true;
1360 				break;
1361 			}
1362 		}
1363 	}
1364 
1365 	ht_conf->single_chain_sufficient = !need_multiple;
1366 }
1367 
1368 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
1369 {
1370 	struct iwl_chain_noise_data *data = &priv->chain_noise_data;
1371 	int ret;
1372 
1373 	if (priv->calib_disabled & IWL_CHAIN_NOISE_CALIB_DISABLED)
1374 		return;
1375 
1376 	if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
1377 	    iwl_is_any_associated(priv)) {
1378 		struct iwl_calib_chain_noise_reset_cmd cmd;
1379 
1380 		/* clear data for chain noise calibration algorithm */
1381 		data->chain_noise_a = 0;
1382 		data->chain_noise_b = 0;
1383 		data->chain_noise_c = 0;
1384 		data->chain_signal_a = 0;
1385 		data->chain_signal_b = 0;
1386 		data->chain_signal_c = 0;
1387 		data->beacon_count = 0;
1388 
1389 		memset(&cmd, 0, sizeof(cmd));
1390 		iwl_set_calib_hdr(&cmd.hdr,
1391 			priv->phy_calib_chain_noise_reset_cmd);
1392 		ret = iwl_dvm_send_cmd_pdu(priv,
1393 					REPLY_PHY_CALIBRATION_CMD,
1394 					0, sizeof(cmd), &cmd);
1395 		if (ret)
1396 			IWL_ERR(priv,
1397 				"Could not send REPLY_PHY_CALIBRATION_CMD\n");
1398 		data->state = IWL_CHAIN_NOISE_ACCUMULATE;
1399 		IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
1400 	}
1401 }
1402 
1403 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
1404 			     struct ieee80211_vif *vif,
1405 			     struct ieee80211_bss_conf *bss_conf,
1406 			     u32 changes)
1407 {
1408 	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1409 	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1410 	int ret;
1411 	bool force = false;
1412 
1413 	mutex_lock(&priv->mutex);
1414 
1415 	if (changes & BSS_CHANGED_IDLE && bss_conf->idle) {
1416 		/*
1417 		 * If we go idle, then clearly no "passive-no-rx"
1418 		 * workaround is needed any more, this is a reset.
1419 		 */
1420 		iwlagn_lift_passive_no_rx(priv);
1421 	}
1422 
1423 	if (unlikely(!iwl_is_ready(priv))) {
1424 		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1425 		mutex_unlock(&priv->mutex);
1426 		return;
1427         }
1428 
1429 	if (unlikely(!ctx->vif)) {
1430 		IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
1431 		mutex_unlock(&priv->mutex);
1432 		return;
1433 	}
1434 
1435 	if (changes & BSS_CHANGED_BEACON_INT)
1436 		force = true;
1437 
1438 	if (changes & BSS_CHANGED_QOS) {
1439 		ctx->qos_data.qos_active = bss_conf->qos;
1440 		iwlagn_update_qos(priv, ctx);
1441 	}
1442 
1443 	ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
1444 	if (vif->bss_conf.use_short_preamble)
1445 		ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
1446 	else
1447 		ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
1448 
1449 	if (changes & BSS_CHANGED_ASSOC) {
1450 		if (bss_conf->assoc) {
1451 			priv->timestamp = bss_conf->sync_tsf;
1452 			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1453 		} else {
1454 			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1455 
1456 			if (ctx->ctxid == IWL_RXON_CTX_BSS)
1457 				priv->have_rekey_data = false;
1458 		}
1459 
1460 		iwlagn_bt_coex_rssi_monitor(priv);
1461 	}
1462 
1463 	if (ctx->ht.enabled) {
1464 		ctx->ht.protection = bss_conf->ht_operation_mode &
1465 					IEEE80211_HT_OP_MODE_PROTECTION;
1466 		ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
1467 					IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
1468 		iwlagn_check_needed_chains(priv, ctx, bss_conf);
1469 		iwl_set_rxon_ht(priv, &priv->current_ht_config);
1470 	}
1471 
1472 	iwlagn_set_rxon_chain(priv, ctx);
1473 
1474 	if (bss_conf->use_cts_prot && (priv->band != NL80211_BAND_5GHZ))
1475 		ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
1476 	else
1477 		ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
1478 
1479 	if (bss_conf->use_cts_prot)
1480 		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1481 	else
1482 		ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
1483 
1484 	memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
1485 
1486 	if (vif->type == NL80211_IFTYPE_AP ||
1487 	    vif->type == NL80211_IFTYPE_ADHOC) {
1488 		if (vif->bss_conf.enable_beacon) {
1489 			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1490 			priv->beacon_ctx = ctx;
1491 		} else {
1492 			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1493 			priv->beacon_ctx = NULL;
1494 		}
1495 	}
1496 
1497 	/*
1498 	 * If the ucode decides to do beacon filtering before
1499 	 * association, it will lose beacons that are needed
1500 	 * before sending frames out on passive channels. This
1501 	 * causes association failures on those channels. Enable
1502 	 * receiving beacons in such cases.
1503 	 */
1504 
1505 	if (vif->type == NL80211_IFTYPE_STATION) {
1506 		if (!bss_conf->assoc)
1507 			ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
1508 		else
1509 			ctx->staging.filter_flags &=
1510 						    ~RXON_FILTER_BCON_AWARE_MSK;
1511 	}
1512 
1513 	if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1514 		iwlagn_commit_rxon(priv, ctx);
1515 
1516 	if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
1517 		/*
1518 		 * The chain noise calibration will enable PM upon
1519 		 * completion. If calibration has already been run
1520 		 * then we need to enable power management here.
1521 		 */
1522 		if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
1523 			iwl_power_update_mode(priv, false);
1524 
1525 		/* Enable RX differential gain and sensitivity calibrations */
1526 		iwlagn_chain_noise_reset(priv);
1527 		priv->start_calib = 1;
1528 	}
1529 
1530 	if (changes & BSS_CHANGED_IBSS) {
1531 		ret = iwlagn_manage_ibss_station(priv, vif,
1532 						 bss_conf->ibss_joined);
1533 		if (ret)
1534 			IWL_ERR(priv, "failed to %s IBSS station %pM\n",
1535 				bss_conf->ibss_joined ? "add" : "remove",
1536 				bss_conf->bssid);
1537 	}
1538 
1539 	if (changes & BSS_CHANGED_BEACON && priv->beacon_ctx == ctx) {
1540 		if (iwlagn_update_beacon(priv, vif))
1541 			IWL_ERR(priv, "Error updating beacon\n");
1542 	}
1543 
1544 	mutex_unlock(&priv->mutex);
1545 }
1546 
1547 void iwlagn_post_scan(struct iwl_priv *priv)
1548 {
1549 	struct iwl_rxon_context *ctx;
1550 
1551 	/*
1552 	 * We do not commit power settings while scan is pending,
1553 	 * do it now if the settings changed.
1554 	 */
1555 	iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
1556 	iwl_set_tx_power(priv, priv->tx_power_next, false);
1557 
1558 	/*
1559 	 * Since setting the RXON may have been deferred while
1560 	 * performing the scan, fire one off if needed
1561 	 */
1562 	for_each_context(priv, ctx)
1563 		if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1564 			iwlagn_commit_rxon(priv, ctx);
1565 
1566 	iwlagn_set_pan_params(priv);
1567 }
1568