1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3  *
4  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
5  * Copyright(c) 2015 Intel Deutschland GmbH
6  *****************************************************************************/
7 
8 #include <linux/etherdevice.h>
9 #include "iwl-trans.h"
10 #include "iwl-modparams.h"
11 #include "dev.h"
12 #include "agn.h"
13 #include "calib.h"
14 
15 /*
16  * initialize rxon structure with default values from eeprom
17  */
18 void iwl_connection_init_rx_config(struct iwl_priv *priv,
19 				   struct iwl_rxon_context *ctx)
20 {
21 	memset(&ctx->staging, 0, sizeof(ctx->staging));
22 
23 	if (!ctx->vif) {
24 		ctx->staging.dev_type = ctx->unused_devtype;
25 	} else
26 	switch (ctx->vif->type) {
27 	case NL80211_IFTYPE_AP:
28 		ctx->staging.dev_type = ctx->ap_devtype;
29 		break;
30 
31 	case NL80211_IFTYPE_STATION:
32 		ctx->staging.dev_type = ctx->station_devtype;
33 		ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
34 		break;
35 
36 	case NL80211_IFTYPE_ADHOC:
37 		ctx->staging.dev_type = ctx->ibss_devtype;
38 		ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
39 		ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
40 						  RXON_FILTER_ACCEPT_GRP_MSK;
41 		break;
42 
43 	case NL80211_IFTYPE_MONITOR:
44 		ctx->staging.dev_type = RXON_DEV_TYPE_SNIFFER;
45 		break;
46 
47 	default:
48 		IWL_ERR(priv, "Unsupported interface type %d\n",
49 			ctx->vif->type);
50 		break;
51 	}
52 
53 #if 0
54 	/* TODO:  Figure out when short_preamble would be set and cache from
55 	 * that */
56 	if (!hw_to_local(priv->hw)->short_preamble)
57 		ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
58 	else
59 		ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
60 #endif
61 
62 	ctx->staging.channel =
63 		cpu_to_le16(priv->hw->conf.chandef.chan->hw_value);
64 	priv->band = priv->hw->conf.chandef.chan->band;
65 
66 	iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
67 
68 	/* clear both MIX and PURE40 mode flag */
69 	ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
70 					RXON_FLG_CHANNEL_MODE_PURE_40);
71 	if (ctx->vif)
72 		memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
73 
74 	ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
75 	ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
76 	ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
77 }
78 
79 static int iwlagn_disable_bss(struct iwl_priv *priv,
80 			      struct iwl_rxon_context *ctx,
81 			      struct iwl_rxon_cmd *send)
82 {
83 	__le32 old_filter = send->filter_flags;
84 	int ret;
85 
86 	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
87 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
88 				0, sizeof(*send), send);
89 
90 	send->filter_flags = old_filter;
91 
92 	if (ret)
93 		IWL_DEBUG_QUIET_RFKILL(priv,
94 			"Error clearing ASSOC_MSK on BSS (%d)\n", ret);
95 
96 	return ret;
97 }
98 
99 static int iwlagn_disable_pan(struct iwl_priv *priv,
100 			      struct iwl_rxon_context *ctx,
101 			      struct iwl_rxon_cmd *send)
102 {
103 	struct iwl_notification_wait disable_wait;
104 	__le32 old_filter = send->filter_flags;
105 	u8 old_dev_type = send->dev_type;
106 	int ret;
107 	static const u16 deactivate_cmd[] = {
108 		REPLY_WIPAN_DEACTIVATION_COMPLETE
109 	};
110 
111 	iwl_init_notification_wait(&priv->notif_wait, &disable_wait,
112 				   deactivate_cmd, ARRAY_SIZE(deactivate_cmd),
113 				   NULL, NULL);
114 
115 	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
116 	send->dev_type = RXON_DEV_TYPE_P2P;
117 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
118 				0, sizeof(*send), send);
119 
120 	send->filter_flags = old_filter;
121 	send->dev_type = old_dev_type;
122 
123 	if (ret) {
124 		IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
125 		iwl_remove_notification(&priv->notif_wait, &disable_wait);
126 	} else {
127 		ret = iwl_wait_notification(&priv->notif_wait,
128 					    &disable_wait, HZ);
129 		if (ret)
130 			IWL_ERR(priv, "Timed out waiting for PAN disable\n");
131 	}
132 
133 	return ret;
134 }
135 
136 static int iwlagn_disconn_pan(struct iwl_priv *priv,
137 			      struct iwl_rxon_context *ctx,
138 			      struct iwl_rxon_cmd *send)
139 {
140 	__le32 old_filter = send->filter_flags;
141 	int ret;
142 
143 	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
144 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, 0,
145 				sizeof(*send), send);
146 
147 	send->filter_flags = old_filter;
148 
149 	return ret;
150 }
151 
152 static void iwlagn_update_qos(struct iwl_priv *priv,
153 			      struct iwl_rxon_context *ctx)
154 {
155 	int ret;
156 
157 	if (!ctx->is_active)
158 		return;
159 
160 	ctx->qos_data.def_qos_parm.qos_flags = 0;
161 
162 	if (ctx->qos_data.qos_active)
163 		ctx->qos_data.def_qos_parm.qos_flags |=
164 			QOS_PARAM_FLG_UPDATE_EDCA_MSK;
165 
166 	if (ctx->ht.enabled)
167 		ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
168 
169 	IWL_DEBUG_INFO(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
170 		      ctx->qos_data.qos_active,
171 		      ctx->qos_data.def_qos_parm.qos_flags);
172 
173 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->qos_cmd, 0,
174 			       sizeof(struct iwl_qosparam_cmd),
175 			       &ctx->qos_data.def_qos_parm);
176 	if (ret)
177 		IWL_DEBUG_QUIET_RFKILL(priv, "Failed to update QoS\n");
178 }
179 
180 static int iwlagn_update_beacon(struct iwl_priv *priv,
181 				struct ieee80211_vif *vif)
182 {
183 	lockdep_assert_held(&priv->mutex);
184 
185 	dev_kfree_skb(priv->beacon_skb);
186 	priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
187 	if (!priv->beacon_skb)
188 		return -ENOMEM;
189 	return iwlagn_send_beacon_cmd(priv);
190 }
191 
192 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
193 				  struct iwl_rxon_context *ctx)
194 {
195 	int ret = 0;
196 	struct iwl_rxon_assoc_cmd rxon_assoc;
197 	const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
198 	const struct iwl_rxon_cmd *rxon2 = &ctx->active;
199 
200 	if ((rxon1->flags == rxon2->flags) &&
201 	    (rxon1->filter_flags == rxon2->filter_flags) &&
202 	    (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
203 	    (rxon1->ofdm_ht_single_stream_basic_rates ==
204 	     rxon2->ofdm_ht_single_stream_basic_rates) &&
205 	    (rxon1->ofdm_ht_dual_stream_basic_rates ==
206 	     rxon2->ofdm_ht_dual_stream_basic_rates) &&
207 	    (rxon1->ofdm_ht_triple_stream_basic_rates ==
208 	     rxon2->ofdm_ht_triple_stream_basic_rates) &&
209 	    (rxon1->acquisition_data == rxon2->acquisition_data) &&
210 	    (rxon1->rx_chain == rxon2->rx_chain) &&
211 	    (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
212 		IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
213 		return 0;
214 	}
215 
216 	rxon_assoc.flags = ctx->staging.flags;
217 	rxon_assoc.filter_flags = ctx->staging.filter_flags;
218 	rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
219 	rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
220 	rxon_assoc.reserved1 = 0;
221 	rxon_assoc.reserved2 = 0;
222 	rxon_assoc.reserved3 = 0;
223 	rxon_assoc.ofdm_ht_single_stream_basic_rates =
224 	    ctx->staging.ofdm_ht_single_stream_basic_rates;
225 	rxon_assoc.ofdm_ht_dual_stream_basic_rates =
226 	    ctx->staging.ofdm_ht_dual_stream_basic_rates;
227 	rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
228 	rxon_assoc.ofdm_ht_triple_stream_basic_rates =
229 		 ctx->staging.ofdm_ht_triple_stream_basic_rates;
230 	rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
231 
232 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_assoc_cmd,
233 				CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
234 	return ret;
235 }
236 
237 static u16 iwl_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
238 {
239 	u16 new_val;
240 	u16 beacon_factor;
241 
242 	/*
243 	 * If mac80211 hasn't given us a beacon interval, program
244 	 * the default into the device (not checking this here
245 	 * would cause the adjustment below to return the maximum
246 	 * value, which may break PAN.)
247 	 */
248 	if (!beacon_val)
249 		return DEFAULT_BEACON_INTERVAL;
250 
251 	/*
252 	 * If the beacon interval we obtained from the peer
253 	 * is too large, we'll have to wake up more often
254 	 * (and in IBSS case, we'll beacon too much)
255 	 *
256 	 * For example, if max_beacon_val is 4096, and the
257 	 * requested beacon interval is 7000, we'll have to
258 	 * use 3500 to be able to wake up on the beacons.
259 	 *
260 	 * This could badly influence beacon detection stats.
261 	 */
262 
263 	beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
264 	new_val = beacon_val / beacon_factor;
265 
266 	if (!new_val)
267 		new_val = max_beacon_val;
268 
269 	return new_val;
270 }
271 
272 static int iwl_send_rxon_timing(struct iwl_priv *priv,
273 				struct iwl_rxon_context *ctx)
274 {
275 	u64 tsf;
276 	s32 interval_tm, rem;
277 	struct ieee80211_conf *conf = NULL;
278 	u16 beacon_int;
279 	struct ieee80211_vif *vif = ctx->vif;
280 
281 	conf = &priv->hw->conf;
282 
283 	lockdep_assert_held(&priv->mutex);
284 
285 	memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));
286 
287 	ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
288 	ctx->timing.listen_interval = cpu_to_le16(conf->listen_interval);
289 
290 	beacon_int = vif ? vif->bss_conf.beacon_int : 0;
291 
292 	/*
293 	 * TODO: For IBSS we need to get atim_window from mac80211,
294 	 *	 for now just always use 0
295 	 */
296 	ctx->timing.atim_window = 0;
297 
298 	if (ctx->ctxid == IWL_RXON_CTX_PAN &&
299 	    (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
300 	    iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
301 	    priv->contexts[IWL_RXON_CTX_BSS].vif &&
302 	    priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
303 		ctx->timing.beacon_interval =
304 			priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
305 		beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
306 	} else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
307 		   iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
308 		   priv->contexts[IWL_RXON_CTX_PAN].vif &&
309 		   priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
310 		   (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
311 		    !ctx->vif->bss_conf.beacon_int)) {
312 		ctx->timing.beacon_interval =
313 			priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
314 		beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
315 	} else {
316 		beacon_int = iwl_adjust_beacon_interval(beacon_int,
317 			IWL_MAX_UCODE_BEACON_INTERVAL * TIME_UNIT);
318 		ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
319 	}
320 
321 	ctx->beacon_int = beacon_int;
322 
323 	tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
324 	interval_tm = beacon_int * TIME_UNIT;
325 	rem = do_div(tsf, interval_tm);
326 	ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
327 
328 	ctx->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ?: 1) : 1;
329 
330 	IWL_DEBUG_ASSOC(priv,
331 			"beacon interval %d beacon timer %d beacon tim %d\n",
332 			le16_to_cpu(ctx->timing.beacon_interval),
333 			le32_to_cpu(ctx->timing.beacon_init_val),
334 			le16_to_cpu(ctx->timing.atim_window));
335 
336 	return iwl_dvm_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
337 				0, sizeof(ctx->timing), &ctx->timing);
338 }
339 
340 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
341 			       struct iwl_rxon_context *ctx)
342 {
343 	int ret;
344 	struct iwl_rxon_cmd *active = (void *)&ctx->active;
345 
346 	if (ctx->ctxid == IWL_RXON_CTX_BSS) {
347 		ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
348 	} else {
349 		ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
350 		if (ret)
351 			return ret;
352 		if (ctx->vif) {
353 			ret = iwl_send_rxon_timing(priv, ctx);
354 			if (ret) {
355 				IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
356 				return ret;
357 			}
358 			ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
359 		}
360 	}
361 	if (ret)
362 		return ret;
363 
364 	/*
365 	 * Un-assoc RXON clears the station table and WEP
366 	 * keys, so we have to restore those afterwards.
367 	 */
368 	iwl_clear_ucode_stations(priv, ctx);
369 	/* update -- might need P2P now */
370 	iwl_update_bcast_station(priv, ctx);
371 	iwl_restore_stations(priv, ctx);
372 	ret = iwl_restore_default_wep_keys(priv, ctx);
373 	if (ret) {
374 		IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
375 		return ret;
376 	}
377 
378 	memcpy(active, &ctx->staging, sizeof(*active));
379 	return 0;
380 }
381 
382 static int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
383 {
384 	int ret;
385 	s8 prev_tx_power;
386 	bool defer;
387 	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
388 
389 	if (priv->calib_disabled & IWL_TX_POWER_CALIB_DISABLED)
390 		return 0;
391 
392 	lockdep_assert_held(&priv->mutex);
393 
394 	if (priv->tx_power_user_lmt == tx_power && !force)
395 		return 0;
396 
397 	if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
398 		IWL_WARN(priv,
399 			 "Requested user TXPOWER %d below lower limit %d.\n",
400 			 tx_power,
401 			 IWLAGN_TX_POWER_TARGET_POWER_MIN);
402 		return -EINVAL;
403 	}
404 
405 	if (tx_power > DIV_ROUND_UP(priv->nvm_data->max_tx_pwr_half_dbm, 2)) {
406 		IWL_WARN(priv,
407 			"Requested user TXPOWER %d above upper limit %d.\n",
408 			 tx_power, priv->nvm_data->max_tx_pwr_half_dbm);
409 		return -EINVAL;
410 	}
411 
412 	if (!iwl_is_ready_rf(priv))
413 		return -EIO;
414 
415 	/* scan complete and commit_rxon use tx_power_next value,
416 	 * it always need to be updated for newest request */
417 	priv->tx_power_next = tx_power;
418 
419 	/* do not set tx power when scanning or channel changing */
420 	defer = test_bit(STATUS_SCANNING, &priv->status) ||
421 		memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
422 	if (defer && !force) {
423 		IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
424 		return 0;
425 	}
426 
427 	prev_tx_power = priv->tx_power_user_lmt;
428 	priv->tx_power_user_lmt = tx_power;
429 
430 	ret = iwlagn_send_tx_power(priv);
431 
432 	/* if fail to set tx_power, restore the orig. tx power */
433 	if (ret) {
434 		priv->tx_power_user_lmt = prev_tx_power;
435 		priv->tx_power_next = prev_tx_power;
436 	}
437 	return ret;
438 }
439 
440 static int iwlagn_rxon_connect(struct iwl_priv *priv,
441 			       struct iwl_rxon_context *ctx)
442 {
443 	int ret;
444 	struct iwl_rxon_cmd *active = (void *)&ctx->active;
445 
446 	/* RXON timing must be before associated RXON */
447 	if (ctx->ctxid == IWL_RXON_CTX_BSS) {
448 		ret = iwl_send_rxon_timing(priv, ctx);
449 		if (ret) {
450 			IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
451 			return ret;
452 		}
453 	}
454 	/* QoS info may be cleared by previous un-assoc RXON */
455 	iwlagn_update_qos(priv, ctx);
456 
457 	/*
458 	 * We'll run into this code path when beaconing is
459 	 * enabled, but then we also need to send the beacon
460 	 * to the device.
461 	 */
462 	if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
463 		ret = iwlagn_update_beacon(priv, ctx->vif);
464 		if (ret) {
465 			IWL_ERR(priv,
466 				"Error sending required beacon (%d)!\n",
467 				ret);
468 			return ret;
469 		}
470 	}
471 
472 	priv->start_calib = 0;
473 	/*
474 	 * Apply the new configuration.
475 	 *
476 	 * Associated RXON doesn't clear the station table in uCode,
477 	 * so we don't need to restore stations etc. after this.
478 	 */
479 	ret = iwl_dvm_send_cmd_pdu(priv, ctx->rxon_cmd, 0,
480 		      sizeof(struct iwl_rxon_cmd), &ctx->staging);
481 	if (ret) {
482 		IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
483 		return ret;
484 	}
485 	memcpy(active, &ctx->staging, sizeof(*active));
486 
487 	/* IBSS beacon needs to be sent after setting assoc */
488 	if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
489 		if (iwlagn_update_beacon(priv, ctx->vif))
490 			IWL_ERR(priv, "Error sending IBSS beacon\n");
491 	iwl_init_sensitivity(priv);
492 
493 	/*
494 	 * If we issue a new RXON command which required a tune then
495 	 * we must send a new TXPOWER command or we won't be able to
496 	 * Tx any frames.
497 	 *
498 	 * It's expected we set power here if channel is changing.
499 	 */
500 	ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
501 	if (ret) {
502 		IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
503 		return ret;
504 	}
505 
506 	return 0;
507 }
508 
509 int iwlagn_set_pan_params(struct iwl_priv *priv)
510 {
511 	struct iwl_wipan_params_cmd cmd;
512 	struct iwl_rxon_context *ctx_bss, *ctx_pan;
513 	int slot0 = 300, slot1 = 0;
514 	int ret;
515 
516 	if (priv->valid_contexts == BIT(IWL_RXON_CTX_BSS))
517 		return 0;
518 
519 	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
520 
521 	lockdep_assert_held(&priv->mutex);
522 
523 	ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
524 	ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
525 
526 	/*
527 	 * If the PAN context is inactive, then we don't need
528 	 * to update the PAN parameters, the last thing we'll
529 	 * have done before it goes inactive is making the PAN
530 	 * parameters be WLAN-only.
531 	 */
532 	if (!ctx_pan->is_active)
533 		return 0;
534 
535 	memset(&cmd, 0, sizeof(cmd));
536 
537 	/* only 2 slots are currently allowed */
538 	cmd.num_slots = 2;
539 
540 	cmd.slots[0].type = 0; /* BSS */
541 	cmd.slots[1].type = 1; /* PAN */
542 
543 	if (ctx_bss->vif && ctx_pan->vif) {
544 		int bcnint = ctx_pan->beacon_int;
545 		int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
546 
547 		/* should be set, but seems unused?? */
548 		cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
549 
550 		if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
551 		    bcnint &&
552 		    bcnint != ctx_bss->beacon_int) {
553 			IWL_ERR(priv,
554 				"beacon intervals don't match (%d, %d)\n",
555 				ctx_bss->beacon_int, ctx_pan->beacon_int);
556 		} else
557 			bcnint = max_t(int, bcnint,
558 				       ctx_bss->beacon_int);
559 		if (!bcnint)
560 			bcnint = DEFAULT_BEACON_INTERVAL;
561 		slot0 = bcnint / 2;
562 		slot1 = bcnint - slot0;
563 
564 		if (test_bit(STATUS_SCAN_HW, &priv->status) ||
565 		    (!ctx_bss->vif->bss_conf.idle &&
566 		     !ctx_bss->vif->bss_conf.assoc)) {
567 			slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
568 			slot1 = IWL_MIN_SLOT_TIME;
569 		} else if (!ctx_pan->vif->bss_conf.idle &&
570 			   !ctx_pan->vif->bss_conf.assoc) {
571 			slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
572 			slot0 = IWL_MIN_SLOT_TIME;
573 		}
574 	} else if (ctx_pan->vif) {
575 		slot0 = 0;
576 		slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
577 					ctx_pan->beacon_int;
578 		slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
579 
580 		if (test_bit(STATUS_SCAN_HW, &priv->status)) {
581 			slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
582 			slot1 = IWL_MIN_SLOT_TIME;
583 		}
584 	}
585 
586 	cmd.slots[0].width = cpu_to_le16(slot0);
587 	cmd.slots[1].width = cpu_to_le16(slot1);
588 
589 	ret = iwl_dvm_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, 0,
590 			sizeof(cmd), &cmd);
591 	if (ret)
592 		IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
593 
594 	return ret;
595 }
596 
597 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
598 			     struct iwl_ht_config *ht_conf,
599 			     struct iwl_rxon_context *ctx)
600 {
601 	struct iwl_rxon_cmd *rxon = &ctx->staging;
602 
603 	if (!ctx->ht.enabled) {
604 		rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
605 			RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
606 			RXON_FLG_HT40_PROT_MSK |
607 			RXON_FLG_HT_PROT_MSK);
608 		return;
609 	}
610 
611 	/* FIXME: if the definition of ht.protection changed, the "translation"
612 	 * will be needed for rxon->flags
613 	 */
614 	rxon->flags |= cpu_to_le32(ctx->ht.protection <<
615 				   RXON_FLG_HT_OPERATING_MODE_POS);
616 
617 	/* Set up channel bandwidth:
618 	 * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
619 	/* clear the HT channel mode before set the mode */
620 	rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
621 			 RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
622 	if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
623 		/* pure ht40 */
624 		if (ctx->ht.protection ==
625 		    IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
626 			rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
627 			/*
628 			 * Note: control channel is opposite of extension
629 			 * channel
630 			 */
631 			switch (ctx->ht.extension_chan_offset) {
632 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
633 				rxon->flags &=
634 					~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
635 				break;
636 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
637 				rxon->flags |=
638 					RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
639 				break;
640 			}
641 		} else {
642 			/*
643 			 * Note: control channel is opposite of extension
644 			 * channel
645 			 */
646 			switch (ctx->ht.extension_chan_offset) {
647 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
648 				rxon->flags &=
649 					~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
650 				rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
651 				break;
652 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
653 				rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
654 				rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
655 				break;
656 			case IEEE80211_HT_PARAM_CHA_SEC_NONE:
657 			default:
658 				/*
659 				 * channel location only valid if in Mixed
660 				 * mode
661 				 */
662 				IWL_ERR(priv,
663 					"invalid extension channel offset\n");
664 				break;
665 			}
666 		}
667 	} else {
668 		rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
669 	}
670 
671 	iwlagn_set_rxon_chain(priv, ctx);
672 
673 	IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
674 			"extension channel offset 0x%x\n",
675 			le32_to_cpu(rxon->flags), ctx->ht.protection,
676 			ctx->ht.extension_chan_offset);
677 }
678 
679 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
680 {
681 	struct iwl_rxon_context *ctx;
682 
683 	for_each_context(priv, ctx)
684 		_iwl_set_rxon_ht(priv, ht_conf, ctx);
685 }
686 
687 /*
688  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
689  * @ch: requested channel as a pointer to struct ieee80211_channel
690 
691  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
692  * in the staging RXON flag structure based on the ch->band
693  */
694 void iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
695 			 struct iwl_rxon_context *ctx)
696 {
697 	enum nl80211_band band = ch->band;
698 	u16 channel = ch->hw_value;
699 
700 	if ((le16_to_cpu(ctx->staging.channel) == channel) &&
701 	    (priv->band == band))
702 		return;
703 
704 	ctx->staging.channel = cpu_to_le16(channel);
705 	if (band == NL80211_BAND_5GHZ)
706 		ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
707 	else
708 		ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
709 
710 	priv->band = band;
711 
712 	IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
713 
714 }
715 
716 void iwl_set_flags_for_band(struct iwl_priv *priv,
717 			    struct iwl_rxon_context *ctx,
718 			    enum nl80211_band band,
719 			    struct ieee80211_vif *vif)
720 {
721 	if (band == NL80211_BAND_5GHZ) {
722 		ctx->staging.flags &=
723 		    ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
724 		      | RXON_FLG_CCK_MSK);
725 		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
726 	} else {
727 		/* Copied from iwl_post_associate() */
728 		if (vif && vif->bss_conf.use_short_slot)
729 			ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
730 		else
731 			ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
732 
733 		ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
734 		ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
735 		ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
736 	}
737 }
738 
739 static void iwl_set_rxon_hwcrypto(struct iwl_priv *priv,
740 				  struct iwl_rxon_context *ctx, int hw_decrypt)
741 {
742 	struct iwl_rxon_cmd *rxon = &ctx->staging;
743 
744 	if (hw_decrypt)
745 		rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
746 	else
747 		rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
748 
749 }
750 
751 /* validate RXON structure is valid */
752 static int iwl_check_rxon_cmd(struct iwl_priv *priv,
753 			      struct iwl_rxon_context *ctx)
754 {
755 	struct iwl_rxon_cmd *rxon = &ctx->staging;
756 	u32 errors = 0;
757 
758 	if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
759 		if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
760 			IWL_WARN(priv, "check 2.4G: wrong narrow\n");
761 			errors |= BIT(0);
762 		}
763 		if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
764 			IWL_WARN(priv, "check 2.4G: wrong radar\n");
765 			errors |= BIT(1);
766 		}
767 	} else {
768 		if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
769 			IWL_WARN(priv, "check 5.2G: not short slot!\n");
770 			errors |= BIT(2);
771 		}
772 		if (rxon->flags & RXON_FLG_CCK_MSK) {
773 			IWL_WARN(priv, "check 5.2G: CCK!\n");
774 			errors |= BIT(3);
775 		}
776 	}
777 	if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
778 		IWL_WARN(priv, "mac/bssid mcast!\n");
779 		errors |= BIT(4);
780 	}
781 
782 	/* make sure basic rates 6Mbps and 1Mbps are supported */
783 	if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
784 	    (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
785 		IWL_WARN(priv, "neither 1 nor 6 are basic\n");
786 		errors |= BIT(5);
787 	}
788 
789 	if (le16_to_cpu(rxon->assoc_id) > 2007) {
790 		IWL_WARN(priv, "aid > 2007\n");
791 		errors |= BIT(6);
792 	}
793 
794 	if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
795 			== (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
796 		IWL_WARN(priv, "CCK and short slot\n");
797 		errors |= BIT(7);
798 	}
799 
800 	if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
801 			== (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
802 		IWL_WARN(priv, "CCK and auto detect\n");
803 		errors |= BIT(8);
804 	}
805 
806 	if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
807 			    RXON_FLG_TGG_PROTECT_MSK)) ==
808 			    RXON_FLG_TGG_PROTECT_MSK) {
809 		IWL_WARN(priv, "TGg but no auto-detect\n");
810 		errors |= BIT(9);
811 	}
812 
813 	if (rxon->channel == 0) {
814 		IWL_WARN(priv, "zero channel is invalid\n");
815 		errors |= BIT(10);
816 	}
817 
818 	WARN(errors, "Invalid RXON (%#x), channel %d",
819 	     errors, le16_to_cpu(rxon->channel));
820 
821 	return errors ? -EINVAL : 0;
822 }
823 
824 /*
825  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
826  * @priv: staging_rxon is compared to active_rxon
827  *
828  * If the RXON structure is changing enough to require a new tune,
829  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
830  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
831  */
832 static int iwl_full_rxon_required(struct iwl_priv *priv,
833 				  struct iwl_rxon_context *ctx)
834 {
835 	const struct iwl_rxon_cmd *staging = &ctx->staging;
836 	const struct iwl_rxon_cmd *active = &ctx->active;
837 
838 #define CHK(cond)							\
839 	if ((cond)) {							\
840 		IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");	\
841 		return 1;						\
842 	}
843 
844 #define CHK_NEQ(c1, c2)						\
845 	if ((c1) != (c2)) {					\
846 		IWL_DEBUG_INFO(priv, "need full RXON - "	\
847 			       #c1 " != " #c2 " - %d != %d\n",	\
848 			       (c1), (c2));			\
849 		return 1;					\
850 	}
851 
852 	/* These items are only settable from the full RXON command */
853 	CHK(!iwl_is_associated_ctx(ctx));
854 	CHK(!ether_addr_equal(staging->bssid_addr, active->bssid_addr));
855 	CHK(!ether_addr_equal(staging->node_addr, active->node_addr));
856 	CHK(!ether_addr_equal(staging->wlap_bssid_addr,
857 			      active->wlap_bssid_addr));
858 	CHK_NEQ(staging->dev_type, active->dev_type);
859 	CHK_NEQ(staging->channel, active->channel);
860 	CHK_NEQ(staging->air_propagation, active->air_propagation);
861 	CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
862 		active->ofdm_ht_single_stream_basic_rates);
863 	CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
864 		active->ofdm_ht_dual_stream_basic_rates);
865 	CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
866 		active->ofdm_ht_triple_stream_basic_rates);
867 	CHK_NEQ(staging->assoc_id, active->assoc_id);
868 
869 	/* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
870 	 * be updated with the RXON_ASSOC command -- however only some
871 	 * flag transitions are allowed using RXON_ASSOC */
872 
873 	/* Check if we are not switching bands */
874 	CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
875 		active->flags & RXON_FLG_BAND_24G_MSK);
876 
877 	/* Check if we are switching association toggle */
878 	CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
879 		active->filter_flags & RXON_FILTER_ASSOC_MSK);
880 
881 #undef CHK
882 #undef CHK_NEQ
883 
884 	return 0;
885 }
886 
887 #ifdef CONFIG_IWLWIFI_DEBUG
888 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
889 			     enum iwl_rxon_context_id ctxid)
890 {
891 	struct iwl_rxon_context *ctx = &priv->contexts[ctxid];
892 	struct iwl_rxon_cmd *rxon = &ctx->staging;
893 
894 	IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
895 	iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
896 	IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n",
897 			le16_to_cpu(rxon->channel));
898 	IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n",
899 			le32_to_cpu(rxon->flags));
900 	IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
901 			le32_to_cpu(rxon->filter_flags));
902 	IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
903 	IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
904 			rxon->ofdm_basic_rates);
905 	IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n",
906 			rxon->cck_basic_rates);
907 	IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
908 	IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
909 	IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n",
910 			le16_to_cpu(rxon->assoc_id));
911 }
912 #endif
913 
914 static void iwl_calc_basic_rates(struct iwl_priv *priv,
915 				 struct iwl_rxon_context *ctx)
916 {
917 	int lowest_present_ofdm = 100;
918 	int lowest_present_cck = 100;
919 	u8 cck = 0;
920 	u8 ofdm = 0;
921 
922 	if (ctx->vif) {
923 		struct ieee80211_supported_band *sband;
924 		unsigned long basic = ctx->vif->bss_conf.basic_rates;
925 		int i;
926 
927 		sband = priv->hw->wiphy->bands[priv->hw->conf.chandef.chan->band];
928 
929 		for_each_set_bit(i, &basic, BITS_PER_LONG) {
930 			int hw = sband->bitrates[i].hw_value;
931 			if (hw >= IWL_FIRST_OFDM_RATE) {
932 				ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
933 				if (lowest_present_ofdm > hw)
934 					lowest_present_ofdm = hw;
935 			} else {
936 				BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
937 
938 				cck |= BIT(hw);
939 				if (lowest_present_cck > hw)
940 					lowest_present_cck = hw;
941 			}
942 		}
943 	}
944 
945 	/*
946 	 * Now we've got the basic rates as bitmaps in the ofdm and cck
947 	 * variables. This isn't sufficient though, as there might not
948 	 * be all the right rates in the bitmap. E.g. if the only basic
949 	 * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
950 	 * and 6 Mbps because the 802.11-2007 standard says in 9.6:
951 	 *
952 	 *    [...] a STA responding to a received frame shall transmit
953 	 *    its Control Response frame [...] at the highest rate in the
954 	 *    BSSBasicRateSet parameter that is less than or equal to the
955 	 *    rate of the immediately previous frame in the frame exchange
956 	 *    sequence ([...]) and that is of the same modulation class
957 	 *    ([...]) as the received frame. If no rate contained in the
958 	 *    BSSBasicRateSet parameter meets these conditions, then the
959 	 *    control frame sent in response to a received frame shall be
960 	 *    transmitted at the highest mandatory rate of the PHY that is
961 	 *    less than or equal to the rate of the received frame, and
962 	 *    that is of the same modulation class as the received frame.
963 	 *
964 	 * As a consequence, we need to add all mandatory rates that are
965 	 * lower than all of the basic rates to these bitmaps.
966 	 */
967 
968 	if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
969 		ofdm |= IWL_RATE_24M_MASK >> IWL_FIRST_OFDM_RATE;
970 	if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
971 		ofdm |= IWL_RATE_12M_MASK >> IWL_FIRST_OFDM_RATE;
972 	/* 6M already there or needed so always add */
973 	ofdm |= IWL_RATE_6M_MASK >> IWL_FIRST_OFDM_RATE;
974 
975 	/*
976 	 * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
977 	 * Note, however:
978 	 *  - if no CCK rates are basic, it must be ERP since there must
979 	 *    be some basic rates at all, so they're OFDM => ERP PHY
980 	 *    (or we're in 5 GHz, and the cck bitmap will never be used)
981 	 *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
982 	 *  - if 5.5M is basic, 1M and 2M are mandatory
983 	 *  - if 2M is basic, 1M is mandatory
984 	 *  - if 1M is basic, that's the only valid ACK rate.
985 	 * As a consequence, it's not as complicated as it sounds, just add
986 	 * any lower rates to the ACK rate bitmap.
987 	 */
988 	if (IWL_RATE_11M_INDEX < lowest_present_cck)
989 		cck |= IWL_RATE_11M_MASK >> IWL_FIRST_CCK_RATE;
990 	if (IWL_RATE_5M_INDEX < lowest_present_cck)
991 		cck |= IWL_RATE_5M_MASK >> IWL_FIRST_CCK_RATE;
992 	if (IWL_RATE_2M_INDEX < lowest_present_cck)
993 		cck |= IWL_RATE_2M_MASK >> IWL_FIRST_CCK_RATE;
994 	/* 1M already there or needed so always add */
995 	cck |= IWL_RATE_1M_MASK >> IWL_FIRST_CCK_RATE;
996 
997 	IWL_DEBUG_RATE(priv, "Set basic rates cck:0x%.2x ofdm:0x%.2x\n",
998 		       cck, ofdm);
999 
1000 	/* "basic_rates" is a misnomer here -- should be called ACK rates */
1001 	ctx->staging.cck_basic_rates = cck;
1002 	ctx->staging.ofdm_basic_rates = ofdm;
1003 }
1004 
1005 /*
1006  * iwlagn_commit_rxon - commit staging_rxon to hardware
1007  *
1008  * The RXON command in staging_rxon is committed to the hardware and
1009  * the active_rxon structure is updated with the new data.  This
1010  * function correctly transitions out of the RXON_ASSOC_MSK state if
1011  * a HW tune is required based on the RXON structure changes.
1012  *
1013  * The connect/disconnect flow should be as the following:
1014  *
1015  * 1. make sure send RXON command with association bit unset if not connect
1016  *	this should include the channel and the band for the candidate
1017  *	to be connected to
1018  * 2. Add Station before RXON association with the AP
1019  * 3. RXON_timing has to send before RXON for connection
1020  * 4. full RXON command - associated bit set
1021  * 5. use RXON_ASSOC command to update any flags changes
1022  */
1023 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
1024 {
1025 	/* cast away the const for active_rxon in this function */
1026 	struct iwl_rxon_cmd *active = (void *)&ctx->active;
1027 	bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
1028 	int ret;
1029 
1030 	lockdep_assert_held(&priv->mutex);
1031 
1032 	if (!iwl_is_alive(priv))
1033 		return -EBUSY;
1034 
1035 	/* This function hardcodes a bunch of dual-mode assumptions */
1036 	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
1037 
1038 	if (!ctx->is_active)
1039 		return 0;
1040 
1041 	/* always get timestamp with Rx frame */
1042 	ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
1043 
1044 	/* recalculate basic rates */
1045 	iwl_calc_basic_rates(priv, ctx);
1046 
1047 	/*
1048 	 * force CTS-to-self frames protection if RTS-CTS is not preferred
1049 	 * one aggregation protection method
1050 	 */
1051 	if (!priv->hw_params.use_rts_for_aggregation)
1052 		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1053 
1054 	if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
1055 	    !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
1056 		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
1057 	else
1058 		ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
1059 
1060 	iwl_print_rx_config_cmd(priv, ctx->ctxid);
1061 	ret = iwl_check_rxon_cmd(priv, ctx);
1062 	if (ret) {
1063 		IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
1064 		return -EINVAL;
1065 	}
1066 
1067 	/*
1068 	 * receive commit_rxon request
1069 	 * abort any previous channel switch if still in process
1070 	 */
1071 	if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
1072 	    (priv->switch_channel != ctx->staging.channel)) {
1073 		IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
1074 			      le16_to_cpu(priv->switch_channel));
1075 		iwl_chswitch_done(priv, false);
1076 	}
1077 
1078 	/*
1079 	 * If we don't need to send a full RXON, we can use
1080 	 * iwl_rxon_assoc_cmd which is used to reconfigure filter
1081 	 * and other flags for the current radio configuration.
1082 	 */
1083 	if (!iwl_full_rxon_required(priv, ctx)) {
1084 		ret = iwlagn_send_rxon_assoc(priv, ctx);
1085 		if (ret) {
1086 			IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
1087 			return ret;
1088 		}
1089 
1090 		memcpy(active, &ctx->staging, sizeof(*active));
1091 		/*
1092 		 * We do not commit tx power settings while channel changing,
1093 		 * do it now if after settings changed.
1094 		 */
1095 		iwl_set_tx_power(priv, priv->tx_power_next, false);
1096 
1097 		/* make sure we are in the right PS state */
1098 		iwl_power_update_mode(priv, true);
1099 
1100 		return 0;
1101 	}
1102 
1103 	iwl_set_rxon_hwcrypto(priv, ctx, !iwlwifi_mod_params.swcrypto);
1104 
1105 	IWL_DEBUG_INFO(priv,
1106 		       "Going to commit RXON\n"
1107 		       "  * with%s RXON_FILTER_ASSOC_MSK\n"
1108 		       "  * channel = %d\n"
1109 		       "  * bssid = %pM\n",
1110 		       (new_assoc ? "" : "out"),
1111 		       le16_to_cpu(ctx->staging.channel),
1112 		       ctx->staging.bssid_addr);
1113 
1114 	/*
1115 	 * Always clear associated first, but with the correct config.
1116 	 * This is required as for example station addition for the
1117 	 * AP station must be done after the BSSID is set to correctly
1118 	 * set up filters in the device.
1119 	 */
1120 	ret = iwlagn_rxon_disconn(priv, ctx);
1121 	if (ret)
1122 		return ret;
1123 
1124 	ret = iwlagn_set_pan_params(priv);
1125 	if (ret)
1126 		return ret;
1127 
1128 	if (new_assoc)
1129 		return iwlagn_rxon_connect(priv, ctx);
1130 
1131 	return 0;
1132 }
1133 
1134 void iwlagn_config_ht40(struct ieee80211_conf *conf,
1135 			struct iwl_rxon_context *ctx)
1136 {
1137 	if (conf_is_ht40_minus(conf)) {
1138 		ctx->ht.extension_chan_offset =
1139 			IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1140 		ctx->ht.is_40mhz = true;
1141 	} else if (conf_is_ht40_plus(conf)) {
1142 		ctx->ht.extension_chan_offset =
1143 			IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1144 		ctx->ht.is_40mhz = true;
1145 	} else {
1146 		ctx->ht.extension_chan_offset =
1147 			IEEE80211_HT_PARAM_CHA_SEC_NONE;
1148 		ctx->ht.is_40mhz = false;
1149 	}
1150 }
1151 
1152 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
1153 {
1154 	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1155 	struct iwl_rxon_context *ctx;
1156 	struct ieee80211_conf *conf = &hw->conf;
1157 	struct ieee80211_channel *channel = conf->chandef.chan;
1158 	int ret = 0;
1159 
1160 	IWL_DEBUG_MAC80211(priv, "enter: changed %#x\n", changed);
1161 
1162 	mutex_lock(&priv->mutex);
1163 
1164 	if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
1165 		IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
1166 		goto out;
1167 	}
1168 
1169 	if (!iwl_is_ready(priv)) {
1170 		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1171 		goto out;
1172 	}
1173 
1174 	if (changed & (IEEE80211_CONF_CHANGE_SMPS |
1175 		       IEEE80211_CONF_CHANGE_CHANNEL)) {
1176 		/* mac80211 uses static for non-HT which is what we want */
1177 		priv->current_ht_config.smps = conf->smps_mode;
1178 
1179 		/*
1180 		 * Recalculate chain counts.
1181 		 *
1182 		 * If monitor mode is enabled then mac80211 will
1183 		 * set up the SM PS mode to OFF if an HT channel is
1184 		 * configured.
1185 		 */
1186 		for_each_context(priv, ctx)
1187 			iwlagn_set_rxon_chain(priv, ctx);
1188 	}
1189 
1190 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
1191 		for_each_context(priv, ctx) {
1192 			/* Configure HT40 channels */
1193 			if (ctx->ht.enabled != conf_is_ht(conf))
1194 				ctx->ht.enabled = conf_is_ht(conf);
1195 
1196 			if (ctx->ht.enabled) {
1197 				/* if HT40 is used, it should not change
1198 				 * after associated except channel switch */
1199 				if (!ctx->ht.is_40mhz ||
1200 						!iwl_is_associated_ctx(ctx))
1201 					iwlagn_config_ht40(conf, ctx);
1202 			} else
1203 				ctx->ht.is_40mhz = false;
1204 
1205 			/*
1206 			 * Default to no protection. Protection mode will
1207 			 * later be set from BSS config in iwl_ht_conf
1208 			 */
1209 			ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
1210 
1211 			/* if we are switching from ht to 2.4 clear flags
1212 			 * from any ht related info since 2.4 does not
1213 			 * support ht */
1214 			if (le16_to_cpu(ctx->staging.channel) !=
1215 			    channel->hw_value)
1216 				ctx->staging.flags = 0;
1217 
1218 			iwl_set_rxon_channel(priv, channel, ctx);
1219 			iwl_set_rxon_ht(priv, &priv->current_ht_config);
1220 
1221 			iwl_set_flags_for_band(priv, ctx, channel->band,
1222 					       ctx->vif);
1223 		}
1224 
1225 		iwl_update_bcast_stations(priv);
1226 	}
1227 
1228 	if (changed & (IEEE80211_CONF_CHANGE_PS |
1229 			IEEE80211_CONF_CHANGE_IDLE)) {
1230 		ret = iwl_power_update_mode(priv, false);
1231 		if (ret)
1232 			IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
1233 	}
1234 
1235 	if (changed & IEEE80211_CONF_CHANGE_POWER) {
1236 		IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
1237 			priv->tx_power_user_lmt, conf->power_level);
1238 
1239 		iwl_set_tx_power(priv, conf->power_level, false);
1240 	}
1241 
1242 	for_each_context(priv, ctx) {
1243 		if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1244 			continue;
1245 		iwlagn_commit_rxon(priv, ctx);
1246 	}
1247  out:
1248 	mutex_unlock(&priv->mutex);
1249 	IWL_DEBUG_MAC80211(priv, "leave\n");
1250 
1251 	return ret;
1252 }
1253 
1254 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
1255 				       struct iwl_rxon_context *ctx,
1256 				       struct ieee80211_bss_conf *bss_conf)
1257 {
1258 	struct ieee80211_vif *vif = ctx->vif;
1259 	struct iwl_rxon_context *tmp;
1260 	struct ieee80211_sta *sta;
1261 	struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1262 	struct ieee80211_sta_ht_cap *ht_cap;
1263 	bool need_multiple;
1264 
1265 	lockdep_assert_held(&priv->mutex);
1266 
1267 	switch (vif->type) {
1268 	case NL80211_IFTYPE_STATION:
1269 		rcu_read_lock();
1270 		sta = ieee80211_find_sta(vif, bss_conf->bssid);
1271 		if (!sta) {
1272 			/*
1273 			 * If at all, this can only happen through a race
1274 			 * when the AP disconnects us while we're still
1275 			 * setting up the connection, in that case mac80211
1276 			 * will soon tell us about that.
1277 			 */
1278 			need_multiple = false;
1279 			rcu_read_unlock();
1280 			break;
1281 		}
1282 
1283 		ht_cap = &sta->ht_cap;
1284 
1285 		need_multiple = true;
1286 
1287 		/*
1288 		 * If the peer advertises no support for receiving 2 and 3
1289 		 * stream MCS rates, it can't be transmitting them either.
1290 		 */
1291 		if (ht_cap->mcs.rx_mask[1] == 0 &&
1292 		    ht_cap->mcs.rx_mask[2] == 0) {
1293 			need_multiple = false;
1294 		} else if (!(ht_cap->mcs.tx_params &
1295 						IEEE80211_HT_MCS_TX_DEFINED)) {
1296 			/* If it can't TX MCS at all ... */
1297 			need_multiple = false;
1298 		} else if (ht_cap->mcs.tx_params &
1299 						IEEE80211_HT_MCS_TX_RX_DIFF) {
1300 			int maxstreams;
1301 
1302 			/*
1303 			 * But if it can receive them, it might still not
1304 			 * be able to transmit them, which is what we need
1305 			 * to check here -- so check the number of streams
1306 			 * it advertises for TX (if different from RX).
1307 			 */
1308 
1309 			maxstreams = (ht_cap->mcs.tx_params &
1310 				 IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
1311 			maxstreams >>=
1312 				IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
1313 			maxstreams += 1;
1314 
1315 			if (maxstreams <= 1)
1316 				need_multiple = false;
1317 		}
1318 
1319 		rcu_read_unlock();
1320 		break;
1321 	case NL80211_IFTYPE_ADHOC:
1322 		/* currently */
1323 		need_multiple = false;
1324 		break;
1325 	default:
1326 		/* only AP really */
1327 		need_multiple = true;
1328 		break;
1329 	}
1330 
1331 	ctx->ht_need_multiple_chains = need_multiple;
1332 
1333 	if (!need_multiple) {
1334 		/* check all contexts */
1335 		for_each_context(priv, tmp) {
1336 			if (!tmp->vif)
1337 				continue;
1338 			if (tmp->ht_need_multiple_chains) {
1339 				need_multiple = true;
1340 				break;
1341 			}
1342 		}
1343 	}
1344 
1345 	ht_conf->single_chain_sufficient = !need_multiple;
1346 }
1347 
1348 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
1349 {
1350 	struct iwl_chain_noise_data *data = &priv->chain_noise_data;
1351 	int ret;
1352 
1353 	if (priv->calib_disabled & IWL_CHAIN_NOISE_CALIB_DISABLED)
1354 		return;
1355 
1356 	if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
1357 	    iwl_is_any_associated(priv)) {
1358 		struct iwl_calib_chain_noise_reset_cmd cmd;
1359 
1360 		/* clear data for chain noise calibration algorithm */
1361 		data->chain_noise_a = 0;
1362 		data->chain_noise_b = 0;
1363 		data->chain_noise_c = 0;
1364 		data->chain_signal_a = 0;
1365 		data->chain_signal_b = 0;
1366 		data->chain_signal_c = 0;
1367 		data->beacon_count = 0;
1368 
1369 		memset(&cmd, 0, sizeof(cmd));
1370 		iwl_set_calib_hdr(&cmd.hdr,
1371 			priv->phy_calib_chain_noise_reset_cmd);
1372 		ret = iwl_dvm_send_cmd_pdu(priv,
1373 					REPLY_PHY_CALIBRATION_CMD,
1374 					0, sizeof(cmd), &cmd);
1375 		if (ret)
1376 			IWL_ERR(priv,
1377 				"Could not send REPLY_PHY_CALIBRATION_CMD\n");
1378 		data->state = IWL_CHAIN_NOISE_ACCUMULATE;
1379 		IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
1380 	}
1381 }
1382 
1383 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
1384 			     struct ieee80211_vif *vif,
1385 			     struct ieee80211_bss_conf *bss_conf,
1386 			     u32 changes)
1387 {
1388 	struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
1389 	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1390 	int ret;
1391 	bool force = false;
1392 
1393 	mutex_lock(&priv->mutex);
1394 
1395 	if (changes & BSS_CHANGED_IDLE && bss_conf->idle) {
1396 		/*
1397 		 * If we go idle, then clearly no "passive-no-rx"
1398 		 * workaround is needed any more, this is a reset.
1399 		 */
1400 		iwlagn_lift_passive_no_rx(priv);
1401 	}
1402 
1403 	if (unlikely(!iwl_is_ready(priv))) {
1404 		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
1405 		mutex_unlock(&priv->mutex);
1406 		return;
1407         }
1408 
1409 	if (unlikely(!ctx->vif)) {
1410 		IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
1411 		mutex_unlock(&priv->mutex);
1412 		return;
1413 	}
1414 
1415 	if (changes & BSS_CHANGED_BEACON_INT)
1416 		force = true;
1417 
1418 	if (changes & BSS_CHANGED_QOS) {
1419 		ctx->qos_data.qos_active = bss_conf->qos;
1420 		iwlagn_update_qos(priv, ctx);
1421 	}
1422 
1423 	ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
1424 	if (vif->bss_conf.use_short_preamble)
1425 		ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
1426 	else
1427 		ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
1428 
1429 	if (changes & BSS_CHANGED_ASSOC) {
1430 		if (bss_conf->assoc) {
1431 			priv->timestamp = bss_conf->sync_tsf;
1432 			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1433 		} else {
1434 			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1435 
1436 			if (ctx->ctxid == IWL_RXON_CTX_BSS)
1437 				priv->have_rekey_data = false;
1438 		}
1439 
1440 		iwlagn_bt_coex_rssi_monitor(priv);
1441 	}
1442 
1443 	if (ctx->ht.enabled) {
1444 		ctx->ht.protection = bss_conf->ht_operation_mode &
1445 					IEEE80211_HT_OP_MODE_PROTECTION;
1446 		ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
1447 					IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
1448 		iwlagn_check_needed_chains(priv, ctx, bss_conf);
1449 		iwl_set_rxon_ht(priv, &priv->current_ht_config);
1450 	}
1451 
1452 	iwlagn_set_rxon_chain(priv, ctx);
1453 
1454 	if (bss_conf->use_cts_prot && (priv->band != NL80211_BAND_5GHZ))
1455 		ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
1456 	else
1457 		ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
1458 
1459 	if (bss_conf->use_cts_prot)
1460 		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
1461 	else
1462 		ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
1463 
1464 	memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
1465 
1466 	if (vif->type == NL80211_IFTYPE_AP ||
1467 	    vif->type == NL80211_IFTYPE_ADHOC) {
1468 		if (vif->bss_conf.enable_beacon) {
1469 			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
1470 			priv->beacon_ctx = ctx;
1471 		} else {
1472 			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
1473 			priv->beacon_ctx = NULL;
1474 		}
1475 	}
1476 
1477 	/*
1478 	 * If the ucode decides to do beacon filtering before
1479 	 * association, it will lose beacons that are needed
1480 	 * before sending frames out on passive channels. This
1481 	 * causes association failures on those channels. Enable
1482 	 * receiving beacons in such cases.
1483 	 */
1484 
1485 	if (vif->type == NL80211_IFTYPE_STATION) {
1486 		if (!bss_conf->assoc)
1487 			ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
1488 		else
1489 			ctx->staging.filter_flags &=
1490 						    ~RXON_FILTER_BCON_AWARE_MSK;
1491 	}
1492 
1493 	if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1494 		iwlagn_commit_rxon(priv, ctx);
1495 
1496 	if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
1497 		/*
1498 		 * The chain noise calibration will enable PM upon
1499 		 * completion. If calibration has already been run
1500 		 * then we need to enable power management here.
1501 		 */
1502 		if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
1503 			iwl_power_update_mode(priv, false);
1504 
1505 		/* Enable RX differential gain and sensitivity calibrations */
1506 		iwlagn_chain_noise_reset(priv);
1507 		priv->start_calib = 1;
1508 	}
1509 
1510 	if (changes & BSS_CHANGED_IBSS) {
1511 		ret = iwlagn_manage_ibss_station(priv, vif,
1512 						 bss_conf->ibss_joined);
1513 		if (ret)
1514 			IWL_ERR(priv, "failed to %s IBSS station %pM\n",
1515 				bss_conf->ibss_joined ? "add" : "remove",
1516 				bss_conf->bssid);
1517 	}
1518 
1519 	if (changes & BSS_CHANGED_BEACON && priv->beacon_ctx == ctx) {
1520 		if (iwlagn_update_beacon(priv, vif))
1521 			IWL_ERR(priv, "Error updating beacon\n");
1522 	}
1523 
1524 	mutex_unlock(&priv->mutex);
1525 }
1526 
1527 void iwlagn_post_scan(struct iwl_priv *priv)
1528 {
1529 	struct iwl_rxon_context *ctx;
1530 
1531 	/*
1532 	 * We do not commit power settings while scan is pending,
1533 	 * do it now if the settings changed.
1534 	 */
1535 	iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
1536 	iwl_set_tx_power(priv, priv->tx_power_next, false);
1537 
1538 	/*
1539 	 * Since setting the RXON may have been deferred while
1540 	 * performing the scan, fire one off if needed
1541 	 */
1542 	for_each_context(priv, ctx)
1543 		if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
1544 			iwlagn_commit_rxon(priv, ctx);
1545 
1546 	iwlagn_set_pan_params(priv);
1547 }
1548