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 	if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
527 	    priv->cfg->ht_params && priv->cfg->ht_params->smps_mode)
528 		ieee80211_request_smps(ctx->vif,
529 				       priv->cfg->ht_params->smps_mode);
530 
531 	return 0;
532 }
533 
534 int iwlagn_set_pan_params(struct iwl_priv *priv)
535 {
536 	struct iwl_wipan_params_cmd cmd;
537 	struct iwl_rxon_context *ctx_bss, *ctx_pan;
538 	int slot0 = 300, slot1 = 0;
539 	int ret;
540 
541 	if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
542 		return 0;
543 
544 	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
545 
546 	lockdep_assert_held(&priv->mutex);
547 
548 	ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
549 	ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
550 
551 	/*
552 	 * If the PAN context is inactive, then we don't need
553 	 * to update the PAN parameters, the last thing we'll
554 	 * have done before it goes inactive is making the PAN
555 	 * parameters be WLAN-only.
556 	 */
557 	if (!ctx_pan->is_active)
558 		return 0;
559 
560 	memset(&cmd, 0, sizeof(cmd));
561 
562 	/* only 2 slots are currently allowed */
563 	cmd.num_slots = 2;
564 
565 	cmd.slots[0].type = 0; /* BSS */
566 	cmd.slots[1].type = 1; /* PAN */
567 
568 	if (ctx_bss->vif && ctx_pan->vif) {
569 		int bcnint = ctx_pan->beacon_int;
570 		int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
571 
572 		/* should be set, but seems unused?? */
573 		cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
574 
575 		if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
576 		    bcnint &&
577 		    bcnint != ctx_bss->beacon_int) {
578 			IWL_ERR(priv,
579 				"beacon intervals don't match (%d, %d)\n",
580 				ctx_bss->beacon_int, ctx_pan->beacon_int);
581 		} else
582 			bcnint = max_t(int, bcnint,
583 				       ctx_bss->beacon_int);
584 		if (!bcnint)
585 			bcnint = DEFAULT_BEACON_INTERVAL;
586 		slot0 = bcnint / 2;
587 		slot1 = bcnint - slot0;
588 
589 		if (test_bit(STATUS_SCAN_HW, &priv->status) ||
590 		    (!ctx_bss->vif->bss_conf.idle &&
591 		     !ctx_bss->vif->bss_conf.assoc)) {
592 			slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
593 			slot1 = IWL_MIN_SLOT_TIME;
594 		} else if (!ctx_pan->vif->bss_conf.idle &&
595 			   !ctx_pan->vif->bss_conf.assoc) {
596 			slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
597 			slot0 = IWL_MIN_SLOT_TIME;
598 		}
599 	} else if (ctx_pan->vif) {
600 		slot0 = 0;
601 		slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
602 					ctx_pan->beacon_int;
603 		slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
604 
605 		if (test_bit(STATUS_SCAN_HW, &priv->status)) {
606 			slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
607 			slot1 = IWL_MIN_SLOT_TIME;
608 		}
609 	}
610 
611 	cmd.slots[0].width = cpu_to_le16(slot0);
612 	cmd.slots[1].width = cpu_to_le16(slot1);
613 
614 	ret = iwl_dvm_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, 0,
615 			sizeof(cmd), &cmd);
616 	if (ret)
617 		IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
618 
619 	return ret;
620 }
621 
622 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
623 			     struct iwl_ht_config *ht_conf,
624 			     struct iwl_rxon_context *ctx)
625 {
626 	struct iwl_rxon_cmd *rxon = &ctx->staging;
627 
628 	if (!ctx->ht.enabled) {
629 		rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
630 			RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
631 			RXON_FLG_HT40_PROT_MSK |
632 			RXON_FLG_HT_PROT_MSK);
633 		return;
634 	}
635 
636 	/* FIXME: if the definition of ht.protection changed, the "translation"
637 	 * will be needed for rxon->flags
638 	 */
639 	rxon->flags |= cpu_to_le32(ctx->ht.protection <<
640 				   RXON_FLG_HT_OPERATING_MODE_POS);
641 
642 	/* Set up channel bandwidth:
643 	 * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
644 	/* clear the HT channel mode before set the mode */
645 	rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
646 			 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
647 	if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
648 		/* pure ht40 */
649 		if (ctx->ht.protection ==
650 		    IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
651 			rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
652 			/*
653 			 * Note: control channel is opposite of extension
654 			 * channel
655 			 */
656 			switch (ctx->ht.extension_chan_offset) {
657 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
658 				rxon->flags &=
659 					~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
660 				break;
661 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
662 				rxon->flags |=
663 					RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
664 				break;
665 			}
666 		} else {
667 			/*
668 			 * Note: control channel is opposite of extension
669 			 * channel
670 			 */
671 			switch (ctx->ht.extension_chan_offset) {
672 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
673 				rxon->flags &=
674 					~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
675 				rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
676 				break;
677 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
678 				rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
679 				rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
680 				break;
681 			case IEEE80211_HT_PARAM_CHA_SEC_NONE:
682 			default:
683 				/*
684 				 * channel location only valid if in Mixed
685 				 * mode
686 				 */
687 				IWL_ERR(priv,
688 					"invalid extension channel offset\n");
689 				break;
690 			}
691 		}
692 	} else {
693 		rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
694 	}
695 
696 	iwlagn_set_rxon_chain(priv, ctx);
697 
698 	IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
699 			"extension channel offset 0x%x\n",
700 			le32_to_cpu(rxon->flags), ctx->ht.protection,
701 			ctx->ht.extension_chan_offset);
702 }
703 
704 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
705 {
706 	struct iwl_rxon_context *ctx;
707 
708 	for_each_context(priv, ctx)
709 		_iwl_set_rxon_ht(priv, ht_conf, ctx);
710 }
711 
712 /**
713  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
714  * @ch: requested channel as a pointer to struct ieee80211_channel
715 
716  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
717  * in the staging RXON flag structure based on the ch->band
718  */
719 void iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
720 			 struct iwl_rxon_context *ctx)
721 {
722 	enum ieee80211_band band = ch->band;
723 	u16 channel = ch->hw_value;
724 
725 	if ((le16_to_cpu(ctx->staging.channel) == channel) &&
726 	    (priv->band == band))
727 		return;
728 
729 	ctx->staging.channel = cpu_to_le16(channel);
730 	if (band == IEEE80211_BAND_5GHZ)
731 		ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
732 	else
733 		ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
734 
735 	priv->band = band;
736 
737 	IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
738 
739 }
740 
741 void iwl_set_flags_for_band(struct iwl_priv *priv,
742 			    struct iwl_rxon_context *ctx,
743 			    enum ieee80211_band band,
744 			    struct ieee80211_vif *vif)
745 {
746 	if (band == IEEE80211_BAND_5GHZ) {
747 		ctx->staging.flags &=
748 		    ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
749 		      | RXON_FLG_CCK_MSK);
750 		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
751 	} else {
752 		/* Copied from iwl_post_associate() */
753 		if (vif && vif->bss_conf.use_short_slot)
754 			ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
755 		else
756 			ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
757 
758 		ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
759 		ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
760 		ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
761 	}
762 }
763 
764 static void iwl_set_rxon_hwcrypto(struct iwl_priv *priv,
765 				  struct iwl_rxon_context *ctx, int hw_decrypt)
766 {
767 	struct iwl_rxon_cmd *rxon = &ctx->staging;
768 
769 	if (hw_decrypt)
770 		rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
771 	else
772 		rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
773 
774 }
775 
776 /* validate RXON structure is valid */
777 static int iwl_check_rxon_cmd(struct iwl_priv *priv,
778 			      struct iwl_rxon_context *ctx)
779 {
780 	struct iwl_rxon_cmd *rxon = &ctx->staging;
781 	u32 errors = 0;
782 
783 	if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
784 		if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
785 			IWL_WARN(priv, "check 2.4G: wrong narrow\n");
786 			errors |= BIT(0);
787 		}
788 		if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
789 			IWL_WARN(priv, "check 2.4G: wrong radar\n");
790 			errors |= BIT(1);
791 		}
792 	} else {
793 		if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
794 			IWL_WARN(priv, "check 5.2G: not short slot!\n");
795 			errors |= BIT(2);
796 		}
797 		if (rxon->flags & RXON_FLG_CCK_MSK) {
798 			IWL_WARN(priv, "check 5.2G: CCK!\n");
799 			errors |= BIT(3);
800 		}
801 	}
802 	if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
803 		IWL_WARN(priv, "mac/bssid mcast!\n");
804 		errors |= BIT(4);
805 	}
806 
807 	/* make sure basic rates 6Mbps and 1Mbps are supported */
808 	if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
809 	    (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
810 		IWL_WARN(priv, "neither 1 nor 6 are basic\n");
811 		errors |= BIT(5);
812 	}
813 
814 	if (le16_to_cpu(rxon->assoc_id) > 2007) {
815 		IWL_WARN(priv, "aid > 2007\n");
816 		errors |= BIT(6);
817 	}
818 
819 	if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
820 			== (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
821 		IWL_WARN(priv, "CCK and short slot\n");
822 		errors |= BIT(7);
823 	}
824 
825 	if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
826 			== (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
827 		IWL_WARN(priv, "CCK and auto detect\n");
828 		errors |= BIT(8);
829 	}
830 
831 	if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
832 			    RXON_FLG_TGG_PROTECT_MSK)) ==
833 			    RXON_FLG_TGG_PROTECT_MSK) {
834 		IWL_WARN(priv, "TGg but no auto-detect\n");
835 		errors |= BIT(9);
836 	}
837 
838 	if (rxon->channel == 0) {
839 		IWL_WARN(priv, "zero channel is invalid\n");
840 		errors |= BIT(10);
841 	}
842 
843 	WARN(errors, "Invalid RXON (%#x), channel %d",
844 	     errors, le16_to_cpu(rxon->channel));
845 
846 	return errors ? -EINVAL : 0;
847 }
848 
849 /**
850  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
851  * @priv: staging_rxon is compared to active_rxon
852  *
853  * If the RXON structure is changing enough to require a new tune,
854  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
855  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
856  */
857 static int iwl_full_rxon_required(struct iwl_priv *priv,
858 				  struct iwl_rxon_context *ctx)
859 {
860 	const struct iwl_rxon_cmd *staging = &ctx->staging;
861 	const struct iwl_rxon_cmd *active = &ctx->active;
862 
863 #define CHK(cond)							\
864 	if ((cond)) {							\
865 		IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");	\
866 		return 1;						\
867 	}
868 
869 #define CHK_NEQ(c1, c2)						\
870 	if ((c1) != (c2)) {					\
871 		IWL_DEBUG_INFO(priv, "need full RXON - "	\
872 			       #c1 " != " #c2 " - %d != %d\n",	\
873 			       (c1), (c2));			\
874 		return 1;					\
875 	}
876 
877 	/* These items are only settable from the full RXON command */
878 	CHK(!iwl_is_associated_ctx(ctx));
879 	CHK(!ether_addr_equal(staging->bssid_addr, active->bssid_addr));
880 	CHK(!ether_addr_equal(staging->node_addr, active->node_addr));
881 	CHK(!ether_addr_equal(staging->wlap_bssid_addr,
882 			      active->wlap_bssid_addr));
883 	CHK_NEQ(staging->dev_type, active->dev_type);
884 	CHK_NEQ(staging->channel, active->channel);
885 	CHK_NEQ(staging->air_propagation, active->air_propagation);
886 	CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
887 		active->ofdm_ht_single_stream_basic_rates);
888 	CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
889 		active->ofdm_ht_dual_stream_basic_rates);
890 	CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
891 		active->ofdm_ht_triple_stream_basic_rates);
892 	CHK_NEQ(staging->assoc_id, active->assoc_id);
893 
894 	/* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
895 	 * be updated with the RXON_ASSOC command -- however only some
896 	 * flag transitions are allowed using RXON_ASSOC */
897 
898 	/* Check if we are not switching bands */
899 	CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
900 		active->flags & RXON_FLG_BAND_24G_MSK);
901 
902 	/* Check if we are switching association toggle */
903 	CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
904 		active->filter_flags & RXON_FILTER_ASSOC_MSK);
905 
906 #undef CHK
907 #undef CHK_NEQ
908 
909 	return 0;
910 }
911 
912 #ifdef CONFIG_IWLWIFI_DEBUG
913 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
914 			     enum iwl_rxon_context_id ctxid)
915 {
916 	struct iwl_rxon_context *ctx = &priv->contexts[ctxid];
917 	struct iwl_rxon_cmd *rxon = &ctx->staging;
918 
919 	IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
920 	iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
921 	IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n",
922 			le16_to_cpu(rxon->channel));
923 	IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n",
924 			le32_to_cpu(rxon->flags));
925 	IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
926 			le32_to_cpu(rxon->filter_flags));
927 	IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
928 	IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
929 			rxon->ofdm_basic_rates);
930 	IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n",
931 			rxon->cck_basic_rates);
932 	IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
933 	IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
934 	IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n",
935 			le16_to_cpu(rxon->assoc_id));
936 }
937 #endif
938 
939 static void iwl_calc_basic_rates(struct iwl_priv *priv,
940 				 struct iwl_rxon_context *ctx)
941 {
942 	int lowest_present_ofdm = 100;
943 	int lowest_present_cck = 100;
944 	u8 cck = 0;
945 	u8 ofdm = 0;
946 
947 	if (ctx->vif) {
948 		struct ieee80211_supported_band *sband;
949 		unsigned long basic = ctx->vif->bss_conf.basic_rates;
950 		int i;
951 
952 		sband = priv->hw->wiphy->bands[priv->hw->conf.chandef.chan->band];
953 
954 		for_each_set_bit(i, &basic, BITS_PER_LONG) {
955 			int hw = sband->bitrates[i].hw_value;
956 			if (hw >= IWL_FIRST_OFDM_RATE) {
957 				ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
958 				if (lowest_present_ofdm > hw)
959 					lowest_present_ofdm = hw;
960 			} else {
961 				BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
962 
963 				cck |= BIT(hw);
964 				if (lowest_present_cck > hw)
965 					lowest_present_cck = hw;
966 			}
967 		}
968 	}
969 
970 	/*
971 	 * Now we've got the basic rates as bitmaps in the ofdm and cck
972 	 * variables. This isn't sufficient though, as there might not
973 	 * be all the right rates in the bitmap. E.g. if the only basic
974 	 * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
975 	 * and 6 Mbps because the 802.11-2007 standard says in 9.6:
976 	 *
977 	 *    [...] a STA responding to a received frame shall transmit
978 	 *    its Control Response frame [...] at the highest rate in the
979 	 *    BSSBasicRateSet parameter that is less than or equal to the
980 	 *    rate of the immediately previous frame in the frame exchange
981 	 *    sequence ([...]) and that is of the same modulation class
982 	 *    ([...]) as the received frame. If no rate contained in the
983 	 *    BSSBasicRateSet parameter meets these conditions, then the
984 	 *    control frame sent in response to a received frame shall be
985 	 *    transmitted at the highest mandatory rate of the PHY that is
986 	 *    less than or equal to the rate of the received frame, and
987 	 *    that is of the same modulation class as the received frame.
988 	 *
989 	 * As a consequence, we need to add all mandatory rates that are
990 	 * lower than all of the basic rates to these bitmaps.
991 	 */
992 
993 	if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
994 		ofdm |= IWL_RATE_24M_MASK >> IWL_FIRST_OFDM_RATE;
995 	if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
996 		ofdm |= IWL_RATE_12M_MASK >> IWL_FIRST_OFDM_RATE;
997 	/* 6M already there or needed so always add */
998 	ofdm |= IWL_RATE_6M_MASK >> IWL_FIRST_OFDM_RATE;
999 
1000 	/*
1001 	 * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
1002 	 * Note, however:
1003 	 *  - if no CCK rates are basic, it must be ERP since there must
1004 	 *    be some basic rates at all, so they're OFDM => ERP PHY
1005 	 *    (or we're in 5 GHz, and the cck bitmap will never be used)
1006 	 *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
1007 	 *  - if 5.5M is basic, 1M and 2M are mandatory
1008 	 *  - if 2M is basic, 1M is mandatory
1009 	 *  - if 1M is basic, that's the only valid ACK rate.
1010 	 * As a consequence, it's not as complicated as it sounds, just add
1011 	 * any lower rates to the ACK rate bitmap.
1012 	 */
1013 	if (IWL_RATE_11M_INDEX < lowest_present_cck)
1014 		cck |= IWL_RATE_11M_MASK >> IWL_FIRST_CCK_RATE;
1015 	if (IWL_RATE_5M_INDEX < lowest_present_cck)
1016 		cck |= IWL_RATE_5M_MASK >> IWL_FIRST_CCK_RATE;
1017 	if (IWL_RATE_2M_INDEX < lowest_present_cck)
1018 		cck |= IWL_RATE_2M_MASK >> IWL_FIRST_CCK_RATE;
1019 	/* 1M already there or needed so always add */
1020 	cck |= IWL_RATE_1M_MASK >> IWL_FIRST_CCK_RATE;
1021 
1022 	IWL_DEBUG_RATE(priv, "Set basic rates cck:0x%.2x ofdm:0x%.2x\n",
1023 		       cck, ofdm);
1024 
1025 	/* "basic_rates" is a misnomer here -- should be called ACK rates */
1026 	ctx->staging.cck_basic_rates = cck;
1027 	ctx->staging.ofdm_basic_rates = ofdm;
1028 }
1029 
1030 /**
1031  * iwlagn_commit_rxon - commit staging_rxon to hardware
1032  *
1033  * The RXON command in staging_rxon is committed to the hardware and
1034  * the active_rxon structure is updated with the new data.  This
1035  * function correctly transitions out of the RXON_ASSOC_MSK state if
1036  * a HW tune is required based on the RXON structure changes.
1037  *
1038  * The connect/disconnect flow should be as the following:
1039  *
1040  * 1. make sure send RXON command with association bit unset if not connect
1041  *	this should include the channel and the band for the candidate
1042  *	to be connected to
1043  * 2. Add Station before RXON association with the AP
1044  * 3. RXON_timing has to send before RXON for connection
1045  * 4. full RXON command - associated bit set
1046  * 5. use RXON_ASSOC command to update any flags changes
1047  */
1048 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
1049 {
1050 	/* cast away the const for active_rxon in this function */
1051 	struct iwl_rxon_cmd *active = (void *)&ctx->active;
1052 	bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
1053 	int ret;
1054 
1055 	lockdep_assert_held(&priv->mutex);
1056 
1057 	if (!iwl_is_alive(priv))
1058 		return -EBUSY;
1059 
1060 	/* This function hardcodes a bunch of dual-mode assumptions */
1061 	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
1062 
1063 	if (!ctx->is_active)
1064 		return 0;
1065 
1066 	/* always get timestamp with Rx frame */
1067 	ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
1068 
1069 	/* recalculate basic rates */
1070 	iwl_calc_basic_rates(priv, ctx);
1071 
1072 	/*
1073 	 * force CTS-to-self frames protection if RTS-CTS is not preferred
1074 	 * one aggregation protection method
1075 	 */
1076 	if (!priv->hw_params.use_rts_for_aggregation)
1077 		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1078 
1079 	if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
1080 	    !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
1081 		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
1082 	else
1083 		ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
1084 
1085 	iwl_print_rx_config_cmd(priv, ctx->ctxid);
1086 	ret = iwl_check_rxon_cmd(priv, ctx);
1087 	if (ret) {
1088 		IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
1089 		return -EINVAL;
1090 	}
1091 
1092 	/*
1093 	 * receive commit_rxon request
1094 	 * abort any previous channel switch if still in process
1095 	 */
1096 	if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
1097 	    (priv->switch_channel != ctx->staging.channel)) {
1098 		IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
1099 			      le16_to_cpu(priv->switch_channel));
1100 		iwl_chswitch_done(priv, false);
1101 	}
1102 
1103 	/*
1104 	 * If we don't need to send a full RXON, we can use
1105 	 * iwl_rxon_assoc_cmd which is used to reconfigure filter
1106 	 * and other flags for the current radio configuration.
1107 	 */
1108 	if (!iwl_full_rxon_required(priv, ctx)) {
1109 		ret = iwlagn_send_rxon_assoc(priv, ctx);
1110 		if (ret) {
1111 			IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
1112 			return ret;
1113 		}
1114 
1115 		memcpy(active, &ctx->staging, sizeof(*active));
1116 		/*
1117 		 * We do not commit tx power settings while channel changing,
1118 		 * do it now if after settings changed.
1119 		 */
1120 		iwl_set_tx_power(priv, priv->tx_power_next, false);
1121 
1122 		/* make sure we are in the right PS state */
1123 		iwl_power_update_mode(priv, true);
1124 
1125 		return 0;
1126 	}
1127 
1128 	iwl_set_rxon_hwcrypto(priv, ctx, !iwlwifi_mod_params.sw_crypto);
1129 
1130 	IWL_DEBUG_INFO(priv,
1131 		       "Going to commit RXON\n"
1132 		       "  * with%s RXON_FILTER_ASSOC_MSK\n"
1133 		       "  * channel = %d\n"
1134 		       "  * bssid = %pM\n",
1135 		       (new_assoc ? "" : "out"),
1136 		       le16_to_cpu(ctx->staging.channel),
1137 		       ctx->staging.bssid_addr);
1138 
1139 	/*
1140 	 * Always clear associated first, but with the correct config.
1141 	 * This is required as for example station addition for the
1142 	 * AP station must be done after the BSSID is set to correctly
1143 	 * set up filters in the device.
1144 	 */
1145 	ret = iwlagn_rxon_disconn(priv, ctx);
1146 	if (ret)
1147 		return ret;
1148 
1149 	ret = iwlagn_set_pan_params(priv);
1150 	if (ret)
1151 		return ret;
1152 
1153 	if (new_assoc)
1154 		return iwlagn_rxon_connect(priv, ctx);
1155 
1156 	return 0;
1157 }
1158 
1159 void iwlagn_config_ht40(struct ieee80211_conf *conf,
1160 			struct iwl_rxon_context *ctx)
1161 {
1162 	if (conf_is_ht40_minus(conf)) {
1163 		ctx->ht.extension_chan_offset =
1164 			IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1165 		ctx->ht.is_40mhz = true;
1166 	} else if (conf_is_ht40_plus(conf)) {
1167 		ctx->ht.extension_chan_offset =
1168 			IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1169 		ctx->ht.is_40mhz = true;
1170 	} else {
1171 		ctx->ht.extension_chan_offset =
1172 			IEEE80211_HT_PARAM_CHA_SEC_NONE;
1173 		ctx->ht.is_40mhz = false;
1174 	}
1175 }
1176 
1177 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
1178 {
1179 	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1180 	struct iwl_rxon_context *ctx;
1181 	struct ieee80211_conf *conf = &hw->conf;
1182 	struct ieee80211_channel *channel = conf->chandef.chan;
1183 	int ret = 0;
1184 
1185 	IWL_DEBUG_MAC80211(priv, "enter: changed %#x\n", changed);
1186 
1187 	mutex_lock(&priv->mutex);
1188 
1189 	if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
1190 		IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
1191 		goto out;
1192 	}
1193 
1194 	if (!iwl_is_ready(priv)) {
1195 		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1196 		goto out;
1197 	}
1198 
1199 	if (changed & (IEEE80211_CONF_CHANGE_SMPS |
1200 		       IEEE80211_CONF_CHANGE_CHANNEL)) {
1201 		/* mac80211 uses static for non-HT which is what we want */
1202 		priv->current_ht_config.smps = conf->smps_mode;
1203 
1204 		/*
1205 		 * Recalculate chain counts.
1206 		 *
1207 		 * If monitor mode is enabled then mac80211 will
1208 		 * set up the SM PS mode to OFF if an HT channel is
1209 		 * configured.
1210 		 */
1211 		for_each_context(priv, ctx)
1212 			iwlagn_set_rxon_chain(priv, ctx);
1213 	}
1214 
1215 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
1216 		for_each_context(priv, ctx) {
1217 			/* Configure HT40 channels */
1218 			if (ctx->ht.enabled != conf_is_ht(conf))
1219 				ctx->ht.enabled = conf_is_ht(conf);
1220 
1221 			if (ctx->ht.enabled) {
1222 				/* if HT40 is used, it should not change
1223 				 * after associated except channel switch */
1224 				if (!ctx->ht.is_40mhz ||
1225 						!iwl_is_associated_ctx(ctx))
1226 					iwlagn_config_ht40(conf, ctx);
1227 			} else
1228 				ctx->ht.is_40mhz = false;
1229 
1230 			/*
1231 			 * Default to no protection. Protection mode will
1232 			 * later be set from BSS config in iwl_ht_conf
1233 			 */
1234 			ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
1235 
1236 			/* if we are switching from ht to 2.4 clear flags
1237 			 * from any ht related info since 2.4 does not
1238 			 * support ht */
1239 			if (le16_to_cpu(ctx->staging.channel) !=
1240 			    channel->hw_value)
1241 				ctx->staging.flags = 0;
1242 
1243 			iwl_set_rxon_channel(priv, channel, ctx);
1244 			iwl_set_rxon_ht(priv, &priv->current_ht_config);
1245 
1246 			iwl_set_flags_for_band(priv, ctx, channel->band,
1247 					       ctx->vif);
1248 		}
1249 
1250 		iwl_update_bcast_stations(priv);
1251 	}
1252 
1253 	if (changed & (IEEE80211_CONF_CHANGE_PS |
1254 			IEEE80211_CONF_CHANGE_IDLE)) {
1255 		ret = iwl_power_update_mode(priv, false);
1256 		if (ret)
1257 			IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
1258 	}
1259 
1260 	if (changed & IEEE80211_CONF_CHANGE_POWER) {
1261 		IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
1262 			priv->tx_power_user_lmt, conf->power_level);
1263 
1264 		iwl_set_tx_power(priv, conf->power_level, false);
1265 	}
1266 
1267 	for_each_context(priv, ctx) {
1268 		if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1269 			continue;
1270 		iwlagn_commit_rxon(priv, ctx);
1271 	}
1272  out:
1273 	mutex_unlock(&priv->mutex);
1274 	IWL_DEBUG_MAC80211(priv, "leave\n");
1275 
1276 	return ret;
1277 }
1278 
1279 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
1280 				       struct iwl_rxon_context *ctx,
1281 				       struct ieee80211_bss_conf *bss_conf)
1282 {
1283 	struct ieee80211_vif *vif = ctx->vif;
1284 	struct iwl_rxon_context *tmp;
1285 	struct ieee80211_sta *sta;
1286 	struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1287 	struct ieee80211_sta_ht_cap *ht_cap;
1288 	bool need_multiple;
1289 
1290 	lockdep_assert_held(&priv->mutex);
1291 
1292 	switch (vif->type) {
1293 	case NL80211_IFTYPE_STATION:
1294 		rcu_read_lock();
1295 		sta = ieee80211_find_sta(vif, bss_conf->bssid);
1296 		if (!sta) {
1297 			/*
1298 			 * If at all, this can only happen through a race
1299 			 * when the AP disconnects us while we're still
1300 			 * setting up the connection, in that case mac80211
1301 			 * will soon tell us about that.
1302 			 */
1303 			need_multiple = false;
1304 			rcu_read_unlock();
1305 			break;
1306 		}
1307 
1308 		ht_cap = &sta->ht_cap;
1309 
1310 		need_multiple = true;
1311 
1312 		/*
1313 		 * If the peer advertises no support for receiving 2 and 3
1314 		 * stream MCS rates, it can't be transmitting them either.
1315 		 */
1316 		if (ht_cap->mcs.rx_mask[1] == 0 &&
1317 		    ht_cap->mcs.rx_mask[2] == 0) {
1318 			need_multiple = false;
1319 		} else if (!(ht_cap->mcs.tx_params &
1320 						IEEE80211_HT_MCS_TX_DEFINED)) {
1321 			/* If it can't TX MCS at all ... */
1322 			need_multiple = false;
1323 		} else if (ht_cap->mcs.tx_params &
1324 						IEEE80211_HT_MCS_TX_RX_DIFF) {
1325 			int maxstreams;
1326 
1327 			/*
1328 			 * But if it can receive them, it might still not
1329 			 * be able to transmit them, which is what we need
1330 			 * to check here -- so check the number of streams
1331 			 * it advertises for TX (if different from RX).
1332 			 */
1333 
1334 			maxstreams = (ht_cap->mcs.tx_params &
1335 				 IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
1336 			maxstreams >>=
1337 				IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
1338 			maxstreams += 1;
1339 
1340 			if (maxstreams <= 1)
1341 				need_multiple = false;
1342 		}
1343 
1344 		rcu_read_unlock();
1345 		break;
1346 	case NL80211_IFTYPE_ADHOC:
1347 		/* currently */
1348 		need_multiple = false;
1349 		break;
1350 	default:
1351 		/* only AP really */
1352 		need_multiple = true;
1353 		break;
1354 	}
1355 
1356 	ctx->ht_need_multiple_chains = need_multiple;
1357 
1358 	if (!need_multiple) {
1359 		/* check all contexts */
1360 		for_each_context(priv, tmp) {
1361 			if (!tmp->vif)
1362 				continue;
1363 			if (tmp->ht_need_multiple_chains) {
1364 				need_multiple = true;
1365 				break;
1366 			}
1367 		}
1368 	}
1369 
1370 	ht_conf->single_chain_sufficient = !need_multiple;
1371 }
1372 
1373 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
1374 {
1375 	struct iwl_chain_noise_data *data = &priv->chain_noise_data;
1376 	int ret;
1377 
1378 	if (priv->calib_disabled & IWL_CHAIN_NOISE_CALIB_DISABLED)
1379 		return;
1380 
1381 	if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
1382 	    iwl_is_any_associated(priv)) {
1383 		struct iwl_calib_chain_noise_reset_cmd cmd;
1384 
1385 		/* clear data for chain noise calibration algorithm */
1386 		data->chain_noise_a = 0;
1387 		data->chain_noise_b = 0;
1388 		data->chain_noise_c = 0;
1389 		data->chain_signal_a = 0;
1390 		data->chain_signal_b = 0;
1391 		data->chain_signal_c = 0;
1392 		data->beacon_count = 0;
1393 
1394 		memset(&cmd, 0, sizeof(cmd));
1395 		iwl_set_calib_hdr(&cmd.hdr,
1396 			priv->phy_calib_chain_noise_reset_cmd);
1397 		ret = iwl_dvm_send_cmd_pdu(priv,
1398 					REPLY_PHY_CALIBRATION_CMD,
1399 					0, sizeof(cmd), &cmd);
1400 		if (ret)
1401 			IWL_ERR(priv,
1402 				"Could not send REPLY_PHY_CALIBRATION_CMD\n");
1403 		data->state = IWL_CHAIN_NOISE_ACCUMULATE;
1404 		IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
1405 	}
1406 }
1407 
1408 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
1409 			     struct ieee80211_vif *vif,
1410 			     struct ieee80211_bss_conf *bss_conf,
1411 			     u32 changes)
1412 {
1413 	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1414 	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1415 	int ret;
1416 	bool force = false;
1417 
1418 	mutex_lock(&priv->mutex);
1419 
1420 	if (changes & BSS_CHANGED_IDLE && bss_conf->idle) {
1421 		/*
1422 		 * If we go idle, then clearly no "passive-no-rx"
1423 		 * workaround is needed any more, this is a reset.
1424 		 */
1425 		iwlagn_lift_passive_no_rx(priv);
1426 	}
1427 
1428 	if (unlikely(!iwl_is_ready(priv))) {
1429 		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1430 		mutex_unlock(&priv->mutex);
1431 		return;
1432         }
1433 
1434 	if (unlikely(!ctx->vif)) {
1435 		IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
1436 		mutex_unlock(&priv->mutex);
1437 		return;
1438 	}
1439 
1440 	if (changes & BSS_CHANGED_BEACON_INT)
1441 		force = true;
1442 
1443 	if (changes & BSS_CHANGED_QOS) {
1444 		ctx->qos_data.qos_active = bss_conf->qos;
1445 		iwlagn_update_qos(priv, ctx);
1446 	}
1447 
1448 	ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
1449 	if (vif->bss_conf.use_short_preamble)
1450 		ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
1451 	else
1452 		ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
1453 
1454 	if (changes & BSS_CHANGED_ASSOC) {
1455 		if (bss_conf->assoc) {
1456 			priv->timestamp = bss_conf->sync_tsf;
1457 			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1458 		} else {
1459 			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1460 
1461 			if (ctx->ctxid == IWL_RXON_CTX_BSS)
1462 				priv->have_rekey_data = false;
1463 		}
1464 
1465 		iwlagn_bt_coex_rssi_monitor(priv);
1466 	}
1467 
1468 	if (ctx->ht.enabled) {
1469 		ctx->ht.protection = bss_conf->ht_operation_mode &
1470 					IEEE80211_HT_OP_MODE_PROTECTION;
1471 		ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
1472 					IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
1473 		iwlagn_check_needed_chains(priv, ctx, bss_conf);
1474 		iwl_set_rxon_ht(priv, &priv->current_ht_config);
1475 	}
1476 
1477 	iwlagn_set_rxon_chain(priv, ctx);
1478 
1479 	if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
1480 		ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
1481 	else
1482 		ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
1483 
1484 	if (bss_conf->use_cts_prot)
1485 		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1486 	else
1487 		ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
1488 
1489 	memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
1490 
1491 	if (vif->type == NL80211_IFTYPE_AP ||
1492 	    vif->type == NL80211_IFTYPE_ADHOC) {
1493 		if (vif->bss_conf.enable_beacon) {
1494 			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1495 			priv->beacon_ctx = ctx;
1496 		} else {
1497 			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1498 			priv->beacon_ctx = NULL;
1499 		}
1500 	}
1501 
1502 	/*
1503 	 * If the ucode decides to do beacon filtering before
1504 	 * association, it will lose beacons that are needed
1505 	 * before sending frames out on passive channels. This
1506 	 * causes association failures on those channels. Enable
1507 	 * receiving beacons in such cases.
1508 	 */
1509 
1510 	if (vif->type == NL80211_IFTYPE_STATION) {
1511 		if (!bss_conf->assoc)
1512 			ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
1513 		else
1514 			ctx->staging.filter_flags &=
1515 						    ~RXON_FILTER_BCON_AWARE_MSK;
1516 	}
1517 
1518 	if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1519 		iwlagn_commit_rxon(priv, ctx);
1520 
1521 	if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
1522 		/*
1523 		 * The chain noise calibration will enable PM upon
1524 		 * completion. If calibration has already been run
1525 		 * then we need to enable power management here.
1526 		 */
1527 		if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
1528 			iwl_power_update_mode(priv, false);
1529 
1530 		/* Enable RX differential gain and sensitivity calibrations */
1531 		iwlagn_chain_noise_reset(priv);
1532 		priv->start_calib = 1;
1533 	}
1534 
1535 	if (changes & BSS_CHANGED_IBSS) {
1536 		ret = iwlagn_manage_ibss_station(priv, vif,
1537 						 bss_conf->ibss_joined);
1538 		if (ret)
1539 			IWL_ERR(priv, "failed to %s IBSS station %pM\n",
1540 				bss_conf->ibss_joined ? "add" : "remove",
1541 				bss_conf->bssid);
1542 	}
1543 
1544 	if (changes & BSS_CHANGED_BEACON && priv->beacon_ctx == ctx) {
1545 		if (iwlagn_update_beacon(priv, vif))
1546 			IWL_ERR(priv, "Error updating beacon\n");
1547 	}
1548 
1549 	mutex_unlock(&priv->mutex);
1550 }
1551 
1552 void iwlagn_post_scan(struct iwl_priv *priv)
1553 {
1554 	struct iwl_rxon_context *ctx;
1555 
1556 	/*
1557 	 * We do not commit power settings while scan is pending,
1558 	 * do it now if the settings changed.
1559 	 */
1560 	iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
1561 	iwl_set_tx_power(priv, priv->tx_power_next, false);
1562 
1563 	/*
1564 	 * Since setting the RXON may have been deferred while
1565 	 * performing the scan, fire one off if needed
1566 	 */
1567 	for_each_context(priv, ctx)
1568 		if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1569 			iwlagn_commit_rxon(priv, ctx);
1570 
1571 	iwlagn_set_pan_params(priv);
1572 }
1573