Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/linville...
[pandora-kernel.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-sta.h"
30 #include "iwl-core.h"
31 #include "iwl-agn-calib.h"
32 #include "iwl-helpers.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_send_cmd_pdu(priv, ctx->rxon_cmd, sizeof(*send), send);
43
44         send->filter_flags = old_filter;
45
46         if (ret)
47                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
48
49         return ret;
50 }
51
52 static int iwlagn_disable_pan(struct iwl_priv *priv,
53                               struct iwl_rxon_context *ctx,
54                               struct iwl_rxon_cmd *send)
55 {
56         struct iwl_notification_wait disable_wait;
57         __le32 old_filter = send->filter_flags;
58         u8 old_dev_type = send->dev_type;
59         int ret;
60
61         iwlagn_init_notification_wait(priv, &disable_wait,
62                                       REPLY_WIPAN_DEACTIVATION_COMPLETE,
63                                       NULL, NULL);
64
65         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
66         send->dev_type = RXON_DEV_TYPE_P2P;
67         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd, sizeof(*send), send);
68
69         send->filter_flags = old_filter;
70         send->dev_type = old_dev_type;
71
72         if (ret) {
73                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
74                 iwlagn_remove_notification(priv, &disable_wait);
75         } else {
76                 ret = iwlagn_wait_notification(priv, &disable_wait, HZ);
77                 if (ret)
78                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
79         }
80
81         return ret;
82 }
83
84 static int iwlagn_disconn_pan(struct iwl_priv *priv,
85                               struct iwl_rxon_context *ctx,
86                               struct iwl_rxon_cmd *send)
87 {
88         __le32 old_filter = send->filter_flags;
89         int ret;
90
91         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
92         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd, sizeof(*send), send);
93
94         send->filter_flags = old_filter;
95
96         return ret;
97 }
98
99 static void iwlagn_update_qos(struct iwl_priv *priv,
100                               struct iwl_rxon_context *ctx)
101 {
102         int ret;
103
104         if (!ctx->is_active)
105                 return;
106
107         ctx->qos_data.def_qos_parm.qos_flags = 0;
108
109         if (ctx->qos_data.qos_active)
110                 ctx->qos_data.def_qos_parm.qos_flags |=
111                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
112
113         if (ctx->ht.enabled)
114                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
115
116         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
117                       ctx->qos_data.qos_active,
118                       ctx->qos_data.def_qos_parm.qos_flags);
119
120         ret = iwl_send_cmd_pdu(priv, ctx->qos_cmd,
121                                sizeof(struct iwl_qosparam_cmd),
122                                &ctx->qos_data.def_qos_parm);
123         if (ret)
124                 IWL_ERR(priv, "Failed to update QoS\n");
125 }
126
127 static int iwlagn_update_beacon(struct iwl_priv *priv,
128                                 struct ieee80211_vif *vif)
129 {
130         lockdep_assert_held(&priv->mutex);
131
132         dev_kfree_skb(priv->beacon_skb);
133         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
134         if (!priv->beacon_skb)
135                 return -ENOMEM;
136         return iwlagn_send_beacon_cmd(priv);
137 }
138
139 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
140                            struct iwl_rxon_context *ctx)
141 {
142         int ret = 0;
143         struct iwl_rxon_assoc_cmd rxon_assoc;
144         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
145         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
146
147         if ((rxon1->flags == rxon2->flags) &&
148             (rxon1->filter_flags == rxon2->filter_flags) &&
149             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
150             (rxon1->ofdm_ht_single_stream_basic_rates ==
151              rxon2->ofdm_ht_single_stream_basic_rates) &&
152             (rxon1->ofdm_ht_dual_stream_basic_rates ==
153              rxon2->ofdm_ht_dual_stream_basic_rates) &&
154             (rxon1->ofdm_ht_triple_stream_basic_rates ==
155              rxon2->ofdm_ht_triple_stream_basic_rates) &&
156             (rxon1->acquisition_data == rxon2->acquisition_data) &&
157             (rxon1->rx_chain == rxon2->rx_chain) &&
158             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
159                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
160                 return 0;
161         }
162
163         rxon_assoc.flags = ctx->staging.flags;
164         rxon_assoc.filter_flags = ctx->staging.filter_flags;
165         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
166         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
167         rxon_assoc.reserved1 = 0;
168         rxon_assoc.reserved2 = 0;
169         rxon_assoc.reserved3 = 0;
170         rxon_assoc.ofdm_ht_single_stream_basic_rates =
171             ctx->staging.ofdm_ht_single_stream_basic_rates;
172         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
173             ctx->staging.ofdm_ht_dual_stream_basic_rates;
174         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
175         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
176                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
177         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
178
179         ret = iwl_send_cmd_pdu_async(priv, ctx->rxon_assoc_cmd,
180                                      sizeof(rxon_assoc), &rxon_assoc, NULL);
181         return ret;
182 }
183
184 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
185                                struct iwl_rxon_context *ctx)
186 {
187         int ret;
188         struct iwl_rxon_cmd *active = (void *)&ctx->active;
189
190         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
191                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
192         } else {
193                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
194                 if (ret)
195                         return ret;
196                 if (ctx->vif) {
197                         ret = iwl_send_rxon_timing(priv, ctx);
198                         if (ret) {
199                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
200                                 return ret;
201                         }
202                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
203                 }
204         }
205         if (ret)
206                 return ret;
207
208         /*
209          * Un-assoc RXON clears the station table and WEP
210          * keys, so we have to restore those afterwards.
211          */
212         iwl_clear_ucode_stations(priv, ctx);
213         /* update -- might need P2P now */
214         iwl_update_bcast_station(priv, ctx);
215         iwl_restore_stations(priv, ctx);
216         ret = iwl_restore_default_wep_keys(priv, ctx);
217         if (ret) {
218                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
219                 return ret;
220         }
221
222         memcpy(active, &ctx->staging, sizeof(*active));
223         return 0;
224 }
225
226 static int iwlagn_rxon_connect(struct iwl_priv *priv,
227                                struct iwl_rxon_context *ctx)
228 {
229         int ret;
230         struct iwl_rxon_cmd *active = (void *)&ctx->active;
231
232         /* RXON timing must be before associated RXON */
233         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
234                 ret = iwl_send_rxon_timing(priv, ctx);
235                 if (ret) {
236                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
237                         return ret;
238                 }
239         }
240         /* QoS info may be cleared by previous un-assoc RXON */
241         iwlagn_update_qos(priv, ctx);
242
243         /*
244          * We'll run into this code path when beaconing is
245          * enabled, but then we also need to send the beacon
246          * to the device.
247          */
248         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
249                 ret = iwlagn_update_beacon(priv, ctx->vif);
250                 if (ret) {
251                         IWL_ERR(priv,
252                                 "Error sending required beacon (%d)!\n",
253                                 ret);
254                         return ret;
255                 }
256         }
257
258         priv->start_calib = 0;
259         /*
260          * Apply the new configuration.
261          *
262          * Associated RXON doesn't clear the station table in uCode,
263          * so we don't need to restore stations etc. after this.
264          */
265         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd,
266                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
267         if (ret) {
268                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
269                 return ret;
270         }
271         memcpy(active, &ctx->staging, sizeof(*active));
272
273         iwl_reprogram_ap_sta(priv, ctx);
274
275         /* IBSS beacon needs to be sent after setting assoc */
276         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
277                 if (iwlagn_update_beacon(priv, ctx->vif))
278                         IWL_ERR(priv, "Error sending IBSS beacon\n");
279         iwl_init_sensitivity(priv);
280
281         /*
282          * If we issue a new RXON command which required a tune then
283          * we must send a new TXPOWER command or we won't be able to
284          * Tx any frames.
285          *
286          * It's expected we set power here if channel is changing.
287          */
288         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
289         if (ret) {
290                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
291                 return ret;
292         }
293
294         if ((ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION) &&
295             priv->cfg->ht_params->smps_mode)
296                 ieee80211_request_smps(ctx->vif,
297                                        priv->cfg->ht_params->smps_mode);
298
299         return 0;
300 }
301
302 /**
303  * iwlagn_commit_rxon - commit staging_rxon to hardware
304  *
305  * The RXON command in staging_rxon is committed to the hardware and
306  * the active_rxon structure is updated with the new data.  This
307  * function correctly transitions out of the RXON_ASSOC_MSK state if
308  * a HW tune is required based on the RXON structure changes.
309  *
310  * The connect/disconnect flow should be as the following:
311  *
312  * 1. make sure send RXON command with association bit unset if not connect
313  *      this should include the channel and the band for the candidate
314  *      to be connected to
315  * 2. Add Station before RXON association with the AP
316  * 3. RXON_timing has to send before RXON for connection
317  * 4. full RXON command - associated bit set
318  * 5. use RXON_ASSOC command to update any flags changes
319  */
320 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
321 {
322         /* cast away the const for active_rxon in this function */
323         struct iwl_rxon_cmd *active = (void *)&ctx->active;
324         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
325         int ret;
326
327         lockdep_assert_held(&priv->mutex);
328
329         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
330                 return -EINVAL;
331
332         if (!iwl_is_alive(priv))
333                 return -EBUSY;
334
335         /* This function hardcodes a bunch of dual-mode assumptions */
336         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
337
338         if (!ctx->is_active)
339                 return 0;
340
341         /* always get timestamp with Rx frame */
342         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
343
344         if (ctx->ctxid == IWL_RXON_CTX_PAN && priv->_agn.hw_roc_channel) {
345                 struct ieee80211_channel *chan = priv->_agn.hw_roc_channel;
346
347                 iwl_set_rxon_channel(priv, chan, ctx);
348                 iwl_set_flags_for_band(priv, ctx, chan->band, NULL);
349                 ctx->staging.filter_flags |=
350                         RXON_FILTER_ASSOC_MSK |
351                         RXON_FILTER_PROMISC_MSK |
352                         RXON_FILTER_CTL2HOST_MSK;
353                 ctx->staging.dev_type = RXON_DEV_TYPE_P2P;
354                 new_assoc = true;
355
356                 if (memcmp(&ctx->staging, &ctx->active,
357                            sizeof(ctx->staging)) == 0)
358                         return 0;
359         }
360
361         /*
362          * force CTS-to-self frames protection if RTS-CTS is not preferred
363          * one aggregation protection method
364          */
365         if (!(priv->cfg->ht_params &&
366               priv->cfg->ht_params->use_rts_for_aggregation))
367                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
368
369         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
370             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
371                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
372         else
373                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
374
375         iwl_print_rx_config_cmd(priv, ctx);
376         ret = iwl_check_rxon_cmd(priv, ctx);
377         if (ret) {
378                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
379                 return -EINVAL;
380         }
381
382         /*
383          * receive commit_rxon request
384          * abort any previous channel switch if still in process
385          */
386         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
387             (priv->switch_channel != ctx->staging.channel)) {
388                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
389                               le16_to_cpu(priv->switch_channel));
390                 iwl_chswitch_done(priv, false);
391         }
392
393         /*
394          * If we don't need to send a full RXON, we can use
395          * iwl_rxon_assoc_cmd which is used to reconfigure filter
396          * and other flags for the current radio configuration.
397          */
398         if (!iwl_full_rxon_required(priv, ctx)) {
399                 ret = iwlagn_send_rxon_assoc(priv, ctx);
400                 if (ret) {
401                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
402                         return ret;
403                 }
404
405                 memcpy(active, &ctx->staging, sizeof(*active));
406                 /*
407                  * We do not commit tx power settings while channel changing,
408                  * do it now if after settings changed.
409                  */
410                 iwl_set_tx_power(priv, priv->tx_power_next, false);
411
412                 /* make sure we are in the right PS state */
413                 iwl_power_update_mode(priv, true);
414
415                 return 0;
416         }
417
418         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
419
420         IWL_DEBUG_INFO(priv,
421                        "Going to commit RXON\n"
422                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
423                        "  * channel = %d\n"
424                        "  * bssid = %pM\n",
425                        (new_assoc ? "" : "out"),
426                        le16_to_cpu(ctx->staging.channel),
427                        ctx->staging.bssid_addr);
428
429         /*
430          * Always clear associated first, but with the correct config.
431          * This is required as for example station addition for the
432          * AP station must be done after the BSSID is set to correctly
433          * set up filters in the device.
434          */
435         ret = iwlagn_rxon_disconn(priv, ctx);
436         if (ret)
437                 return ret;
438
439         if (priv->cfg->ops->hcmd->set_pan_params) {
440                 ret = priv->cfg->ops->hcmd->set_pan_params(priv);
441                 if (ret)
442                         return ret;
443         }
444
445         if (new_assoc)
446                 return iwlagn_rxon_connect(priv, ctx);
447
448         return 0;
449 }
450
451 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
452 {
453         struct iwl_priv *priv = hw->priv;
454         struct iwl_rxon_context *ctx;
455         struct ieee80211_conf *conf = &hw->conf;
456         struct ieee80211_channel *channel = conf->channel;
457         const struct iwl_channel_info *ch_info;
458         int ret = 0;
459
460         IWL_DEBUG_MAC80211(priv, "changed %#x", changed);
461
462         mutex_lock(&priv->mutex);
463
464         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
465                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
466                 goto out;
467         }
468
469         if (!iwl_is_ready(priv)) {
470                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
471                 goto out;
472         }
473
474         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
475                        IEEE80211_CONF_CHANGE_CHANNEL)) {
476                 /* mac80211 uses static for non-HT which is what we want */
477                 priv->current_ht_config.smps = conf->smps_mode;
478
479                 /*
480                  * Recalculate chain counts.
481                  *
482                  * If monitor mode is enabled then mac80211 will
483                  * set up the SM PS mode to OFF if an HT channel is
484                  * configured.
485                  */
486                 if (priv->cfg->ops->hcmd->set_rxon_chain)
487                         for_each_context(priv, ctx)
488                                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
489         }
490
491         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
492                 unsigned long flags;
493
494                 ch_info = iwl_get_channel_info(priv, channel->band,
495                                                channel->hw_value);
496                 if (!is_channel_valid(ch_info)) {
497                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
498                         ret = -EINVAL;
499                         goto out;
500                 }
501
502                 spin_lock_irqsave(&priv->lock, flags);
503
504                 for_each_context(priv, ctx) {
505                         /* Configure HT40 channels */
506                         if (ctx->ht.enabled != conf_is_ht(conf))
507                                 ctx->ht.enabled = conf_is_ht(conf);
508
509                         if (ctx->ht.enabled) {
510                                 if (conf_is_ht40_minus(conf)) {
511                                         ctx->ht.extension_chan_offset =
512                                                 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
513                                         ctx->ht.is_40mhz = true;
514                                 } else if (conf_is_ht40_plus(conf)) {
515                                         ctx->ht.extension_chan_offset =
516                                                 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
517                                         ctx->ht.is_40mhz = true;
518                                 } else {
519                                         ctx->ht.extension_chan_offset =
520                                                 IEEE80211_HT_PARAM_CHA_SEC_NONE;
521                                         ctx->ht.is_40mhz = false;
522                                 }
523                         } else
524                                 ctx->ht.is_40mhz = false;
525
526                         /*
527                          * Default to no protection. Protection mode will
528                          * later be set from BSS config in iwl_ht_conf
529                          */
530                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
531
532                         /* if we are switching from ht to 2.4 clear flags
533                          * from any ht related info since 2.4 does not
534                          * support ht */
535                         if (le16_to_cpu(ctx->staging.channel) !=
536                             channel->hw_value)
537                                 ctx->staging.flags = 0;
538
539                         iwl_set_rxon_channel(priv, channel, ctx);
540                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
541
542                         iwl_set_flags_for_band(priv, ctx, channel->band,
543                                                ctx->vif);
544                 }
545
546                 spin_unlock_irqrestore(&priv->lock, flags);
547
548                 iwl_update_bcast_stations(priv);
549
550                 /*
551                  * The list of supported rates and rate mask can be different
552                  * for each band; since the band may have changed, reset
553                  * the rate mask to what mac80211 lists.
554                  */
555                 iwl_set_rate(priv);
556         }
557
558         if (changed & (IEEE80211_CONF_CHANGE_PS |
559                         IEEE80211_CONF_CHANGE_IDLE)) {
560                 ret = iwl_power_update_mode(priv, false);
561                 if (ret)
562                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
563         }
564
565         if (changed & IEEE80211_CONF_CHANGE_POWER) {
566                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
567                         priv->tx_power_user_lmt, conf->power_level);
568
569                 iwl_set_tx_power(priv, conf->power_level, false);
570         }
571
572         for_each_context(priv, ctx) {
573                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
574                         continue;
575                 iwlagn_commit_rxon(priv, ctx);
576         }
577  out:
578         mutex_unlock(&priv->mutex);
579         return ret;
580 }
581
582 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
583                                        struct iwl_rxon_context *ctx,
584                                        struct ieee80211_bss_conf *bss_conf)
585 {
586         struct ieee80211_vif *vif = ctx->vif;
587         struct iwl_rxon_context *tmp;
588         struct ieee80211_sta *sta;
589         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
590         struct ieee80211_sta_ht_cap *ht_cap;
591         bool need_multiple;
592
593         lockdep_assert_held(&priv->mutex);
594
595         switch (vif->type) {
596         case NL80211_IFTYPE_STATION:
597                 rcu_read_lock();
598                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
599                 if (!sta) {
600                         /*
601                          * If at all, this can only happen through a race
602                          * when the AP disconnects us while we're still
603                          * setting up the connection, in that case mac80211
604                          * will soon tell us about that.
605                          */
606                         need_multiple = false;
607                         rcu_read_unlock();
608                         break;
609                 }
610
611                 ht_cap = &sta->ht_cap;
612
613                 need_multiple = true;
614
615                 /*
616                  * If the peer advertises no support for receiving 2 and 3
617                  * stream MCS rates, it can't be transmitting them either.
618                  */
619                 if (ht_cap->mcs.rx_mask[1] == 0 &&
620                     ht_cap->mcs.rx_mask[2] == 0) {
621                         need_multiple = false;
622                 } else if (!(ht_cap->mcs.tx_params &
623                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
624                         /* If it can't TX MCS at all ... */
625                         need_multiple = false;
626                 } else if (ht_cap->mcs.tx_params &
627                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
628                         int maxstreams;
629
630                         /*
631                          * But if it can receive them, it might still not
632                          * be able to transmit them, which is what we need
633                          * to check here -- so check the number of streams
634                          * it advertises for TX (if different from RX).
635                          */
636
637                         maxstreams = (ht_cap->mcs.tx_params &
638                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
639                         maxstreams >>=
640                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
641                         maxstreams += 1;
642
643                         if (maxstreams <= 1)
644                                 need_multiple = false;
645                 }
646
647                 rcu_read_unlock();
648                 break;
649         case NL80211_IFTYPE_ADHOC:
650                 /* currently */
651                 need_multiple = false;
652                 break;
653         default:
654                 /* only AP really */
655                 need_multiple = true;
656                 break;
657         }
658
659         ctx->ht_need_multiple_chains = need_multiple;
660
661         if (!need_multiple) {
662                 /* check all contexts */
663                 for_each_context(priv, tmp) {
664                         if (!tmp->vif)
665                                 continue;
666                         if (tmp->ht_need_multiple_chains) {
667                                 need_multiple = true;
668                                 break;
669                         }
670                 }
671         }
672
673         ht_conf->single_chain_sufficient = !need_multiple;
674 }
675
676 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
677                              struct ieee80211_vif *vif,
678                              struct ieee80211_bss_conf *bss_conf,
679                              u32 changes)
680 {
681         struct iwl_priv *priv = hw->priv;
682         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
683         int ret;
684         bool force = false;
685
686         mutex_lock(&priv->mutex);
687
688         if (unlikely(!iwl_is_ready(priv))) {
689                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
690                 mutex_unlock(&priv->mutex);
691                 return;
692         }
693
694         if (unlikely(!ctx->vif)) {
695                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
696                 mutex_unlock(&priv->mutex);
697                 return;
698         }
699
700         if (changes & BSS_CHANGED_BEACON_INT)
701                 force = true;
702
703         if (changes & BSS_CHANGED_QOS) {
704                 ctx->qos_data.qos_active = bss_conf->qos;
705                 iwlagn_update_qos(priv, ctx);
706         }
707
708         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
709         if (vif->bss_conf.use_short_preamble)
710                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
711         else
712                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
713
714         if (changes & BSS_CHANGED_ASSOC) {
715                 if (bss_conf->assoc) {
716                         priv->timestamp = bss_conf->timestamp;
717                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
718                 } else {
719                         /*
720                          * If we disassociate while there are pending
721                          * frames, just wake up the queues and let the
722                          * frames "escape" ... This shouldn't really
723                          * be happening to start with, but we should
724                          * not get stuck in this case either since it
725                          * can happen if userspace gets confused.
726                          */
727                         if (ctx->last_tx_rejected) {
728                                 ctx->last_tx_rejected = false;
729                                 iwl_wake_any_queue(priv, ctx);
730                         }
731                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
732                 }
733         }
734
735         if (ctx->ht.enabled) {
736                 ctx->ht.protection = bss_conf->ht_operation_mode &
737                                         IEEE80211_HT_OP_MODE_PROTECTION;
738                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
739                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
740                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
741                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
742         }
743
744         if (priv->cfg->ops->hcmd->set_rxon_chain)
745                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
746
747         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
748                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
749         else
750                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
751
752         if (bss_conf->use_cts_prot)
753                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
754         else
755                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
756
757         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
758
759         if (vif->type == NL80211_IFTYPE_AP ||
760             vif->type == NL80211_IFTYPE_ADHOC) {
761                 if (vif->bss_conf.enable_beacon) {
762                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
763                         priv->beacon_ctx = ctx;
764                 } else {
765                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
766                         priv->beacon_ctx = NULL;
767                 }
768         }
769
770         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
771                 iwlagn_commit_rxon(priv, ctx);
772
773         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
774                 /*
775                  * The chain noise calibration will enable PM upon
776                  * completion. If calibration has already been run
777                  * then we need to enable power management here.
778                  */
779                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
780                         iwl_power_update_mode(priv, false);
781
782                 /* Enable RX differential gain and sensitivity calibrations */
783                 iwl_chain_noise_reset(priv);
784                 priv->start_calib = 1;
785         }
786
787         if (changes & BSS_CHANGED_IBSS) {
788                 ret = iwlagn_manage_ibss_station(priv, vif,
789                                                  bss_conf->ibss_joined);
790                 if (ret)
791                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
792                                 bss_conf->ibss_joined ? "add" : "remove",
793                                 bss_conf->bssid);
794         }
795
796         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
797             priv->beacon_ctx) {
798                 if (iwlagn_update_beacon(priv, vif))
799                         IWL_ERR(priv, "Error sending IBSS beacon\n");
800         }
801
802         mutex_unlock(&priv->mutex);
803 }
804
805 void iwlagn_post_scan(struct iwl_priv *priv)
806 {
807         struct iwl_rxon_context *ctx;
808
809         /*
810          * We do not commit power settings while scan is pending,
811          * do it now if the settings changed.
812          */
813         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
814         iwl_set_tx_power(priv, priv->tx_power_next, false);
815
816         /*
817          * Since setting the RXON may have been deferred while
818          * performing the scan, fire one off if needed
819          */
820         for_each_context(priv, ctx)
821                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
822                         iwlagn_commit_rxon(priv, ctx);
823
824         if (priv->cfg->ops->hcmd->set_pan_params)
825                 priv->cfg->ops->hcmd->set_pan_params(priv);
826 }