Merge branch 'fixes-hwmod-regression' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.git] / drivers / net / wireless / iwlwifi / iwl-agn-rxon.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of version 2 of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  * Contact Information:
22  * Intel Linux Wireless <ilw@linux.intel.com>
23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24  *
25  *****************************************************************************/
26
27 #include "iwl-dev.h"
28 #include "iwl-agn.h"
29 #include "iwl-core.h"
30 #include "iwl-agn-calib.h"
31 #include "iwl-trans.h"
32 #include "iwl-shared.h"
33
34 static int iwlagn_disable_bss(struct iwl_priv *priv,
35                               struct iwl_rxon_context *ctx,
36                               struct iwl_rxon_cmd *send)
37 {
38         __le32 old_filter = send->filter_flags;
39         int ret;
40
41         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
42         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
43                                 CMD_SYNC, sizeof(*send), send);
44
45         send->filter_flags = old_filter;
46
47         if (ret)
48                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
49
50         return ret;
51 }
52
53 static int iwlagn_disable_pan(struct iwl_priv *priv,
54                               struct iwl_rxon_context *ctx,
55                               struct iwl_rxon_cmd *send)
56 {
57         struct iwl_notification_wait disable_wait;
58         __le32 old_filter = send->filter_flags;
59         u8 old_dev_type = send->dev_type;
60         int ret;
61
62         iwlagn_init_notification_wait(priv, &disable_wait,
63                                       REPLY_WIPAN_DEACTIVATION_COMPLETE,
64                                       NULL, NULL);
65
66         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
67         send->dev_type = RXON_DEV_TYPE_P2P;
68         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
69                                 CMD_SYNC, sizeof(*send), send);
70
71         send->filter_flags = old_filter;
72         send->dev_type = old_dev_type;
73
74         if (ret) {
75                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
76                 iwlagn_remove_notification(priv, &disable_wait);
77         } else {
78                 ret = iwlagn_wait_notification(priv, &disable_wait, HZ);
79                 if (ret)
80                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
81         }
82
83         return ret;
84 }
85
86 static int iwlagn_disconn_pan(struct iwl_priv *priv,
87                               struct iwl_rxon_context *ctx,
88                               struct iwl_rxon_cmd *send)
89 {
90         __le32 old_filter = send->filter_flags;
91         int ret;
92
93         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
94         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
95                                 sizeof(*send), send);
96
97         send->filter_flags = old_filter;
98
99         return ret;
100 }
101
102 static void iwlagn_update_qos(struct iwl_priv *priv,
103                               struct iwl_rxon_context *ctx)
104 {
105         int ret;
106
107         if (!ctx->is_active)
108                 return;
109
110         ctx->qos_data.def_qos_parm.qos_flags = 0;
111
112         if (ctx->qos_data.qos_active)
113                 ctx->qos_data.def_qos_parm.qos_flags |=
114                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
115
116         if (ctx->ht.enabled)
117                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
118
119         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
120                       ctx->qos_data.qos_active,
121                       ctx->qos_data.def_qos_parm.qos_flags);
122
123         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->qos_cmd, CMD_SYNC,
124                                sizeof(struct iwl_qosparam_cmd),
125                                &ctx->qos_data.def_qos_parm);
126         if (ret)
127                 IWL_ERR(priv, "Failed to update QoS\n");
128 }
129
130 static int iwlagn_update_beacon(struct iwl_priv *priv,
131                                 struct ieee80211_vif *vif)
132 {
133         lockdep_assert_held(&priv->shrd->mutex);
134
135         dev_kfree_skb(priv->beacon_skb);
136         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
137         if (!priv->beacon_skb)
138                 return -ENOMEM;
139         return iwlagn_send_beacon_cmd(priv);
140 }
141
142 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
143                            struct iwl_rxon_context *ctx)
144 {
145         int ret = 0;
146         struct iwl_rxon_assoc_cmd rxon_assoc;
147         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
148         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
149
150         if ((rxon1->flags == rxon2->flags) &&
151             (rxon1->filter_flags == rxon2->filter_flags) &&
152             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
153             (rxon1->ofdm_ht_single_stream_basic_rates ==
154              rxon2->ofdm_ht_single_stream_basic_rates) &&
155             (rxon1->ofdm_ht_dual_stream_basic_rates ==
156              rxon2->ofdm_ht_dual_stream_basic_rates) &&
157             (rxon1->ofdm_ht_triple_stream_basic_rates ==
158              rxon2->ofdm_ht_triple_stream_basic_rates) &&
159             (rxon1->acquisition_data == rxon2->acquisition_data) &&
160             (rxon1->rx_chain == rxon2->rx_chain) &&
161             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
162                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
163                 return 0;
164         }
165
166         rxon_assoc.flags = ctx->staging.flags;
167         rxon_assoc.filter_flags = ctx->staging.filter_flags;
168         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
169         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
170         rxon_assoc.reserved1 = 0;
171         rxon_assoc.reserved2 = 0;
172         rxon_assoc.reserved3 = 0;
173         rxon_assoc.ofdm_ht_single_stream_basic_rates =
174             ctx->staging.ofdm_ht_single_stream_basic_rates;
175         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
176             ctx->staging.ofdm_ht_dual_stream_basic_rates;
177         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
178         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
179                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
180         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
181
182         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_assoc_cmd,
183                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
184         return ret;
185 }
186
187 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
188                                struct iwl_rxon_context *ctx)
189 {
190         int ret;
191         struct iwl_rxon_cmd *active = (void *)&ctx->active;
192
193         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
194                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
195         } else {
196                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
197                 if (ret)
198                         return ret;
199                 if (ctx->vif) {
200                         ret = iwl_send_rxon_timing(priv, ctx);
201                         if (ret) {
202                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
203                                 return ret;
204                         }
205                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
206                 }
207         }
208         if (ret)
209                 return ret;
210
211         /*
212          * Un-assoc RXON clears the station table and WEP
213          * keys, so we have to restore those afterwards.
214          */
215         iwl_clear_ucode_stations(priv, ctx);
216         /* update -- might need P2P now */
217         iwl_update_bcast_station(priv, ctx);
218         iwl_restore_stations(priv, ctx);
219         ret = iwl_restore_default_wep_keys(priv, ctx);
220         if (ret) {
221                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
222                 return ret;
223         }
224
225         memcpy(active, &ctx->staging, sizeof(*active));
226         return 0;
227 }
228
229 static int iwlagn_rxon_connect(struct iwl_priv *priv,
230                                struct iwl_rxon_context *ctx)
231 {
232         int ret;
233         struct iwl_rxon_cmd *active = (void *)&ctx->active;
234
235         /* RXON timing must be before associated RXON */
236         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
237                 ret = iwl_send_rxon_timing(priv, ctx);
238                 if (ret) {
239                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
240                         return ret;
241                 }
242         }
243         /* QoS info may be cleared by previous un-assoc RXON */
244         iwlagn_update_qos(priv, ctx);
245
246         /*
247          * We'll run into this code path when beaconing is
248          * enabled, but then we also need to send the beacon
249          * to the device.
250          */
251         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
252                 ret = iwlagn_update_beacon(priv, ctx->vif);
253                 if (ret) {
254                         IWL_ERR(priv,
255                                 "Error sending required beacon (%d)!\n",
256                                 ret);
257                         return ret;
258                 }
259         }
260
261         priv->start_calib = 0;
262         /*
263          * Apply the new configuration.
264          *
265          * Associated RXON doesn't clear the station table in uCode,
266          * so we don't need to restore stations etc. after this.
267          */
268         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
269                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
270         if (ret) {
271                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
272                 return ret;
273         }
274         memcpy(active, &ctx->staging, sizeof(*active));
275
276         iwl_reprogram_ap_sta(priv, ctx);
277
278         /* IBSS beacon needs to be sent after setting assoc */
279         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
280                 if (iwlagn_update_beacon(priv, ctx->vif))
281                         IWL_ERR(priv, "Error sending IBSS beacon\n");
282         iwl_init_sensitivity(priv);
283
284         /*
285          * If we issue a new RXON command which required a tune then
286          * we must send a new TXPOWER command or we won't be able to
287          * Tx any frames.
288          *
289          * It's expected we set power here if channel is changing.
290          */
291         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
292         if (ret) {
293                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
294                 return ret;
295         }
296
297         if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
298             priv->cfg->ht_params && priv->cfg->ht_params->smps_mode)
299                 ieee80211_request_smps(ctx->vif,
300                                        priv->cfg->ht_params->smps_mode);
301
302         return 0;
303 }
304
305 int iwlagn_set_pan_params(struct iwl_priv *priv)
306 {
307         struct iwl_wipan_params_cmd cmd;
308         struct iwl_rxon_context *ctx_bss, *ctx_pan;
309         int slot0 = 300, slot1 = 0;
310         int ret;
311
312         if (priv->shrd->valid_contexts == BIT(IWL_RXON_CTX_BSS))
313                 return 0;
314
315         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
316
317         lockdep_assert_held(&priv->shrd->mutex);
318
319         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
320         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
321
322         /*
323          * If the PAN context is inactive, then we don't need
324          * to update the PAN parameters, the last thing we'll
325          * have done before it goes inactive is making the PAN
326          * parameters be WLAN-only.
327          */
328         if (!ctx_pan->is_active)
329                 return 0;
330
331         memset(&cmd, 0, sizeof(cmd));
332
333         /* only 2 slots are currently allowed */
334         cmd.num_slots = 2;
335
336         cmd.slots[0].type = 0; /* BSS */
337         cmd.slots[1].type = 1; /* PAN */
338
339         if (priv->hw_roc_setup) {
340                 /* both contexts must be used for this to happen */
341                 slot1 = IWL_MIN_SLOT_TIME;
342                 slot0 = 3000;
343         } else if (ctx_bss->vif && ctx_pan->vif) {
344                 int bcnint = ctx_pan->beacon_int;
345                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
346
347                 /* should be set, but seems unused?? */
348                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
349
350                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
351                     bcnint &&
352                     bcnint != ctx_bss->beacon_int) {
353                         IWL_ERR(priv,
354                                 "beacon intervals don't match (%d, %d)\n",
355                                 ctx_bss->beacon_int, ctx_pan->beacon_int);
356                 } else
357                         bcnint = max_t(int, bcnint,
358                                        ctx_bss->beacon_int);
359                 if (!bcnint)
360                         bcnint = DEFAULT_BEACON_INTERVAL;
361                 slot0 = bcnint / 2;
362                 slot1 = bcnint - slot0;
363
364                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
365                     (!ctx_bss->vif->bss_conf.idle &&
366                      !ctx_bss->vif->bss_conf.assoc)) {
367                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
368                         slot1 = IWL_MIN_SLOT_TIME;
369                 } else if (!ctx_pan->vif->bss_conf.idle &&
370                            !ctx_pan->vif->bss_conf.assoc) {
371                         slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
372                         slot0 = IWL_MIN_SLOT_TIME;
373                 }
374         } else if (ctx_pan->vif) {
375                 slot0 = 0;
376                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
377                                         ctx_pan->beacon_int;
378                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
379
380                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
381                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
382                         slot1 = IWL_MIN_SLOT_TIME;
383                 }
384         }
385
386         cmd.slots[0].width = cpu_to_le16(slot0);
387         cmd.slots[1].width = cpu_to_le16(slot1);
388
389         ret = iwl_trans_send_cmd_pdu(trans(priv), REPLY_WIPAN_PARAMS, CMD_SYNC,
390                         sizeof(cmd), &cmd);
391         if (ret)
392                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
393
394         return ret;
395 }
396
397 /**
398  * iwlagn_commit_rxon - commit staging_rxon to hardware
399  *
400  * The RXON command in staging_rxon is committed to the hardware and
401  * the active_rxon structure is updated with the new data.  This
402  * function correctly transitions out of the RXON_ASSOC_MSK state if
403  * a HW tune is required based on the RXON structure changes.
404  *
405  * The connect/disconnect flow should be as the following:
406  *
407  * 1. make sure send RXON command with association bit unset if not connect
408  *      this should include the channel and the band for the candidate
409  *      to be connected to
410  * 2. Add Station before RXON association with the AP
411  * 3. RXON_timing has to send before RXON for connection
412  * 4. full RXON command - associated bit set
413  * 5. use RXON_ASSOC command to update any flags changes
414  */
415 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
416 {
417         /* cast away the const for active_rxon in this function */
418         struct iwl_rxon_cmd *active = (void *)&ctx->active;
419         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
420         int ret;
421
422         lockdep_assert_held(&priv->shrd->mutex);
423
424         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
425                 return -EINVAL;
426
427         if (!iwl_is_alive(priv->shrd))
428                 return -EBUSY;
429
430         /* This function hardcodes a bunch of dual-mode assumptions */
431         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
432
433         if (!ctx->is_active)
434                 return 0;
435
436         /* override BSSID if necessary due to preauth */
437         if (ctx->preauth_bssid)
438                 memcpy(ctx->staging.bssid_addr, ctx->bssid, ETH_ALEN);
439
440         /* always get timestamp with Rx frame */
441         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
442
443         /*
444          * force CTS-to-self frames protection if RTS-CTS is not preferred
445          * one aggregation protection method
446          */
447         if (!(priv->cfg->ht_params &&
448               priv->cfg->ht_params->use_rts_for_aggregation))
449                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
450
451         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
452             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
453                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
454         else
455                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
456
457         iwl_print_rx_config_cmd(priv, ctx->ctxid);
458         ret = iwl_check_rxon_cmd(priv, ctx);
459         if (ret) {
460                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
461                 return -EINVAL;
462         }
463
464         /*
465          * receive commit_rxon request
466          * abort any previous channel switch if still in process
467          */
468         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status) &&
469             (priv->switch_channel != ctx->staging.channel)) {
470                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
471                               le16_to_cpu(priv->switch_channel));
472                 iwl_chswitch_done(priv, false);
473         }
474
475         /*
476          * If we don't need to send a full RXON, we can use
477          * iwl_rxon_assoc_cmd which is used to reconfigure filter
478          * and other flags for the current radio configuration.
479          */
480         if (!iwl_full_rxon_required(priv, ctx)) {
481                 ret = iwlagn_send_rxon_assoc(priv, ctx);
482                 if (ret) {
483                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
484                         return ret;
485                 }
486
487                 memcpy(active, &ctx->staging, sizeof(*active));
488                 /*
489                  * We do not commit tx power settings while channel changing,
490                  * do it now if after settings changed.
491                  */
492                 iwl_set_tx_power(priv, priv->tx_power_next, false);
493
494                 /* make sure we are in the right PS state */
495                 iwl_power_update_mode(priv, true);
496
497                 return 0;
498         }
499
500         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
501
502         IWL_DEBUG_INFO(priv,
503                        "Going to commit RXON\n"
504                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
505                        "  * channel = %d\n"
506                        "  * bssid = %pM\n",
507                        (new_assoc ? "" : "out"),
508                        le16_to_cpu(ctx->staging.channel),
509                        ctx->staging.bssid_addr);
510
511         /*
512          * Always clear associated first, but with the correct config.
513          * This is required as for example station addition for the
514          * AP station must be done after the BSSID is set to correctly
515          * set up filters in the device.
516          */
517         ret = iwlagn_rxon_disconn(priv, ctx);
518         if (ret)
519                 return ret;
520
521         ret = iwlagn_set_pan_params(priv);
522         if (ret)
523                 return ret;
524
525         if (new_assoc)
526                 return iwlagn_rxon_connect(priv, ctx);
527
528         return 0;
529 }
530
531 void iwlagn_config_ht40(struct ieee80211_conf *conf,
532         struct iwl_rxon_context *ctx)
533 {
534         if (conf_is_ht40_minus(conf)) {
535                 ctx->ht.extension_chan_offset =
536                         IEEE80211_HT_PARAM_CHA_SEC_BELOW;
537                 ctx->ht.is_40mhz = true;
538         } else if (conf_is_ht40_plus(conf)) {
539                 ctx->ht.extension_chan_offset =
540                         IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
541                 ctx->ht.is_40mhz = true;
542         } else {
543                 ctx->ht.extension_chan_offset =
544                         IEEE80211_HT_PARAM_CHA_SEC_NONE;
545                 ctx->ht.is_40mhz = false;
546         }
547 }
548
549 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
550 {
551         struct iwl_priv *priv = hw->priv;
552         struct iwl_rxon_context *ctx;
553         struct ieee80211_conf *conf = &hw->conf;
554         struct ieee80211_channel *channel = conf->channel;
555         const struct iwl_channel_info *ch_info;
556         int ret = 0;
557
558         IWL_DEBUG_MAC80211(priv, "enter: changed %#x", changed);
559
560         mutex_lock(&priv->shrd->mutex);
561
562         if (unlikely(test_bit(STATUS_SCANNING, &priv->shrd->status))) {
563                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
564                 goto out;
565         }
566
567         if (!iwl_is_ready(priv->shrd)) {
568                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
569                 goto out;
570         }
571
572         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
573                        IEEE80211_CONF_CHANGE_CHANNEL)) {
574                 /* mac80211 uses static for non-HT which is what we want */
575                 priv->current_ht_config.smps = conf->smps_mode;
576
577                 /*
578                  * Recalculate chain counts.
579                  *
580                  * If monitor mode is enabled then mac80211 will
581                  * set up the SM PS mode to OFF if an HT channel is
582                  * configured.
583                  */
584                 for_each_context(priv, ctx)
585                         iwlagn_set_rxon_chain(priv, ctx);
586         }
587
588         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
589                 unsigned long flags;
590
591                 ch_info = iwl_get_channel_info(priv, channel->band,
592                                                channel->hw_value);
593                 if (!is_channel_valid(ch_info)) {
594                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
595                         ret = -EINVAL;
596                         goto out;
597                 }
598
599                 spin_lock_irqsave(&priv->shrd->lock, flags);
600
601                 for_each_context(priv, ctx) {
602                         /* Configure HT40 channels */
603                         if (ctx->ht.enabled != conf_is_ht(conf))
604                                 ctx->ht.enabled = conf_is_ht(conf);
605
606                         if (ctx->ht.enabled) {
607                                 /* if HT40 is used, it should not change
608                                  * after associated except channel switch */
609                                 if (iwl_is_associated_ctx(ctx) &&
610                                      !ctx->ht.is_40mhz)
611                                         iwlagn_config_ht40(conf, ctx);
612                         } else
613                                 ctx->ht.is_40mhz = false;
614
615                         /*
616                          * Default to no protection. Protection mode will
617                          * later be set from BSS config in iwl_ht_conf
618                          */
619                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
620
621                         /* if we are switching from ht to 2.4 clear flags
622                          * from any ht related info since 2.4 does not
623                          * support ht */
624                         if (le16_to_cpu(ctx->staging.channel) !=
625                             channel->hw_value)
626                                 ctx->staging.flags = 0;
627
628                         iwl_set_rxon_channel(priv, channel, ctx);
629                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
630
631                         iwl_set_flags_for_band(priv, ctx, channel->band,
632                                                ctx->vif);
633                 }
634
635                 spin_unlock_irqrestore(&priv->shrd->lock, flags);
636
637                 iwl_update_bcast_stations(priv);
638
639                 /*
640                  * The list of supported rates and rate mask can be different
641                  * for each band; since the band may have changed, reset
642                  * the rate mask to what mac80211 lists.
643                  */
644                 iwl_set_rate(priv);
645         }
646
647         if (changed & (IEEE80211_CONF_CHANGE_PS |
648                         IEEE80211_CONF_CHANGE_IDLE)) {
649                 ret = iwl_power_update_mode(priv, false);
650                 if (ret)
651                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
652         }
653
654         if (changed & IEEE80211_CONF_CHANGE_POWER) {
655                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
656                         priv->tx_power_user_lmt, conf->power_level);
657
658                 iwl_set_tx_power(priv, conf->power_level, false);
659         }
660
661         for_each_context(priv, ctx) {
662                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
663                         continue;
664                 iwlagn_commit_rxon(priv, ctx);
665         }
666  out:
667         mutex_unlock(&priv->shrd->mutex);
668         IWL_DEBUG_MAC80211(priv, "leave\n");
669
670         return ret;
671 }
672
673 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
674                                        struct iwl_rxon_context *ctx,
675                                        struct ieee80211_bss_conf *bss_conf)
676 {
677         struct ieee80211_vif *vif = ctx->vif;
678         struct iwl_rxon_context *tmp;
679         struct ieee80211_sta *sta;
680         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
681         struct ieee80211_sta_ht_cap *ht_cap;
682         bool need_multiple;
683
684         lockdep_assert_held(&priv->shrd->mutex);
685
686         switch (vif->type) {
687         case NL80211_IFTYPE_STATION:
688                 rcu_read_lock();
689                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
690                 if (!sta) {
691                         /*
692                          * If at all, this can only happen through a race
693                          * when the AP disconnects us while we're still
694                          * setting up the connection, in that case mac80211
695                          * will soon tell us about that.
696                          */
697                         need_multiple = false;
698                         rcu_read_unlock();
699                         break;
700                 }
701
702                 ht_cap = &sta->ht_cap;
703
704                 need_multiple = true;
705
706                 /*
707                  * If the peer advertises no support for receiving 2 and 3
708                  * stream MCS rates, it can't be transmitting them either.
709                  */
710                 if (ht_cap->mcs.rx_mask[1] == 0 &&
711                     ht_cap->mcs.rx_mask[2] == 0) {
712                         need_multiple = false;
713                 } else if (!(ht_cap->mcs.tx_params &
714                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
715                         /* If it can't TX MCS at all ... */
716                         need_multiple = false;
717                 } else if (ht_cap->mcs.tx_params &
718                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
719                         int maxstreams;
720
721                         /*
722                          * But if it can receive them, it might still not
723                          * be able to transmit them, which is what we need
724                          * to check here -- so check the number of streams
725                          * it advertises for TX (if different from RX).
726                          */
727
728                         maxstreams = (ht_cap->mcs.tx_params &
729                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
730                         maxstreams >>=
731                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
732                         maxstreams += 1;
733
734                         if (maxstreams <= 1)
735                                 need_multiple = false;
736                 }
737
738                 rcu_read_unlock();
739                 break;
740         case NL80211_IFTYPE_ADHOC:
741                 /* currently */
742                 need_multiple = false;
743                 break;
744         default:
745                 /* only AP really */
746                 need_multiple = true;
747                 break;
748         }
749
750         ctx->ht_need_multiple_chains = need_multiple;
751
752         if (!need_multiple) {
753                 /* check all contexts */
754                 for_each_context(priv, tmp) {
755                         if (!tmp->vif)
756                                 continue;
757                         if (tmp->ht_need_multiple_chains) {
758                                 need_multiple = true;
759                                 break;
760                         }
761                 }
762         }
763
764         ht_conf->single_chain_sufficient = !need_multiple;
765 }
766
767 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
768 {
769         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
770         int ret;
771
772         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
773             iwl_is_any_associated(priv)) {
774                 struct iwl_calib_chain_noise_reset_cmd cmd;
775
776                 /* clear data for chain noise calibration algorithm */
777                 data->chain_noise_a = 0;
778                 data->chain_noise_b = 0;
779                 data->chain_noise_c = 0;
780                 data->chain_signal_a = 0;
781                 data->chain_signal_b = 0;
782                 data->chain_signal_c = 0;
783                 data->beacon_count = 0;
784
785                 memset(&cmd, 0, sizeof(cmd));
786                 iwl_set_calib_hdr(&cmd.hdr,
787                         priv->phy_calib_chain_noise_reset_cmd);
788                 ret = iwl_trans_send_cmd_pdu(trans(priv),
789                                         REPLY_PHY_CALIBRATION_CMD,
790                                         CMD_SYNC, sizeof(cmd), &cmd);
791                 if (ret)
792                         IWL_ERR(priv,
793                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
794                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
795                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
796         }
797 }
798
799 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
800                              struct ieee80211_vif *vif,
801                              struct ieee80211_bss_conf *bss_conf,
802                              u32 changes)
803 {
804         struct iwl_priv *priv = hw->priv;
805         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
806         int ret;
807         bool force = false;
808
809         mutex_lock(&priv->shrd->mutex);
810
811         if (unlikely(!iwl_is_ready(priv->shrd))) {
812                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
813                 mutex_unlock(&priv->shrd->mutex);
814                 return;
815         }
816
817         if (unlikely(!ctx->vif)) {
818                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
819                 mutex_unlock(&priv->shrd->mutex);
820                 return;
821         }
822
823         if (changes & BSS_CHANGED_BEACON_INT)
824                 force = true;
825
826         if (changes & BSS_CHANGED_QOS) {
827                 ctx->qos_data.qos_active = bss_conf->qos;
828                 iwlagn_update_qos(priv, ctx);
829         }
830
831         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
832         if (vif->bss_conf.use_short_preamble)
833                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
834         else
835                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
836
837         if (changes & BSS_CHANGED_ASSOC) {
838                 if (bss_conf->assoc) {
839                         priv->timestamp = bss_conf->timestamp;
840                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
841                 } else {
842                         /*
843                          * If we disassociate while there are pending
844                          * frames, just wake up the queues and let the
845                          * frames "escape" ... This shouldn't really
846                          * be happening to start with, but we should
847                          * not get stuck in this case either since it
848                          * can happen if userspace gets confused.
849                          */
850                         if (ctx->last_tx_rejected) {
851                                 ctx->last_tx_rejected = false;
852                                 iwl_trans_wake_any_queue(trans(priv),
853                                                          ctx->ctxid);
854                         }
855                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
856
857                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
858                                 priv->have_rekey_data = false;
859                 }
860
861                 iwlagn_bt_coex_rssi_monitor(priv);
862         }
863
864         if (ctx->ht.enabled) {
865                 ctx->ht.protection = bss_conf->ht_operation_mode &
866                                         IEEE80211_HT_OP_MODE_PROTECTION;
867                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
868                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
869                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
870                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
871         }
872
873         iwlagn_set_rxon_chain(priv, ctx);
874
875         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
876                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
877         else
878                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
879
880         if (bss_conf->use_cts_prot)
881                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
882         else
883                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
884
885         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
886
887         if (vif->type == NL80211_IFTYPE_AP ||
888             vif->type == NL80211_IFTYPE_ADHOC) {
889                 if (vif->bss_conf.enable_beacon) {
890                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
891                         priv->beacon_ctx = ctx;
892                 } else {
893                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
894                         priv->beacon_ctx = NULL;
895                 }
896         }
897
898         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
899                 iwlagn_commit_rxon(priv, ctx);
900
901         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
902                 /*
903                  * The chain noise calibration will enable PM upon
904                  * completion. If calibration has already been run
905                  * then we need to enable power management here.
906                  */
907                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
908                         iwl_power_update_mode(priv, false);
909
910                 /* Enable RX differential gain and sensitivity calibrations */
911                 if (!priv->disable_chain_noise_cal)
912                         iwlagn_chain_noise_reset(priv);
913                 priv->start_calib = 1;
914                 WARN_ON(ctx->preauth_bssid);
915         }
916
917         if (changes & BSS_CHANGED_IBSS) {
918                 ret = iwlagn_manage_ibss_station(priv, vif,
919                                                  bss_conf->ibss_joined);
920                 if (ret)
921                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
922                                 bss_conf->ibss_joined ? "add" : "remove",
923                                 bss_conf->bssid);
924         }
925
926         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
927             priv->beacon_ctx) {
928                 if (iwlagn_update_beacon(priv, vif))
929                         IWL_ERR(priv, "Error sending IBSS beacon\n");
930         }
931
932         mutex_unlock(&priv->shrd->mutex);
933 }
934
935 void iwlagn_post_scan(struct iwl_priv *priv)
936 {
937         struct iwl_rxon_context *ctx;
938
939         /*
940          * We do not commit power settings while scan is pending,
941          * do it now if the settings changed.
942          */
943         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
944         iwl_set_tx_power(priv, priv->tx_power_next, false);
945
946         /*
947          * Since setting the RXON may have been deferred while
948          * performing the scan, fire one off if needed
949          */
950         for_each_context(priv, ctx)
951                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
952                         iwlagn_commit_rxon(priv, ctx);
953
954         iwlagn_set_pan_params(priv);
955 }