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Viewing changes to drivers/net/wireless/iwlegacy/iwl-sta.c

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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drivers/net/wireless/iwlegacy/iwl-sta.c
 
1
/******************************************************************************
 
2
 *
 
3
 * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
 
4
 *
 
5
 * Portions of this file are derived from the ipw3945 project, as well
 
6
 * as portions of the ieee80211 subsystem header files.
 
7
 *
 
8
 * This program is free software; you can redistribute it and/or modify it
 
9
 * under the terms of version 2 of the GNU General Public License as
 
10
 * published by the Free Software Foundation.
 
11
 *
 
12
 * This program is distributed in the hope that it will be useful, but WITHOUT
 
13
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 
14
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 
15
 * more details.
 
16
 *
 
17
 * You should have received a copy of the GNU General Public License along with
 
18
 * this program; if not, write to the Free Software Foundation, Inc.,
 
19
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 
20
 *
 
21
 * The full GNU General Public License is included in this distribution in the
 
22
 * file called LICENSE.
 
23
 *
 
24
 * Contact Information:
 
25
 *  Intel Linux Wireless <ilw@linux.intel.com>
 
26
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 
27
 *
 
28
 *****************************************************************************/
 
29
 
 
30
#include <net/mac80211.h>
 
31
#include <linux/etherdevice.h>
 
32
#include <linux/sched.h>
 
33
#include <linux/lockdep.h>
 
34
 
 
35
#include "iwl-dev.h"
 
36
#include "iwl-core.h"
 
37
#include "iwl-sta.h"
 
38
 
 
39
/* priv->sta_lock must be held */
 
40
static void iwl_legacy_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
 
41
{
 
42
 
 
43
        if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
 
44
                IWL_ERR(priv,
 
45
                        "ACTIVATE a non DRIVER active station id %u addr %pM\n",
 
46
                        sta_id, priv->stations[sta_id].sta.sta.addr);
 
47
 
 
48
        if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
 
49
                IWL_DEBUG_ASSOC(priv,
 
50
                        "STA id %u addr %pM already present"
 
51
                        " in uCode (according to driver)\n",
 
52
                        sta_id, priv->stations[sta_id].sta.sta.addr);
 
53
        } else {
 
54
                priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
 
55
                IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
 
56
                                sta_id, priv->stations[sta_id].sta.sta.addr);
 
57
        }
 
58
}
 
59
 
 
60
static int iwl_legacy_process_add_sta_resp(struct iwl_priv *priv,
 
61
                                    struct iwl_legacy_addsta_cmd *addsta,
 
62
                                    struct iwl_rx_packet *pkt,
 
63
                                    bool sync)
 
64
{
 
65
        u8 sta_id = addsta->sta.sta_id;
 
66
        unsigned long flags;
 
67
        int ret = -EIO;
 
68
 
 
69
        if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 
70
                IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
 
71
                        pkt->hdr.flags);
 
72
                return ret;
 
73
        }
 
74
 
 
75
        IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
 
76
                       sta_id);
 
77
 
 
78
        spin_lock_irqsave(&priv->sta_lock, flags);
 
79
 
 
80
        switch (pkt->u.add_sta.status) {
 
81
        case ADD_STA_SUCCESS_MSK:
 
82
                IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
 
83
                iwl_legacy_sta_ucode_activate(priv, sta_id);
 
84
                ret = 0;
 
85
                break;
 
86
        case ADD_STA_NO_ROOM_IN_TABLE:
 
87
                IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
 
88
                        sta_id);
 
89
                break;
 
90
        case ADD_STA_NO_BLOCK_ACK_RESOURCE:
 
91
                IWL_ERR(priv,
 
92
                        "Adding station %d failed, no block ack resource.\n",
 
93
                        sta_id);
 
94
                break;
 
95
        case ADD_STA_MODIFY_NON_EXIST_STA:
 
96
                IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
 
97
                        sta_id);
 
98
                break;
 
99
        default:
 
100
                IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
 
101
                                pkt->u.add_sta.status);
 
102
                break;
 
103
        }
 
104
 
 
105
        IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 
106
                       priv->stations[sta_id].sta.mode ==
 
107
                       STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 
108
                       sta_id, priv->stations[sta_id].sta.sta.addr);
 
109
 
 
110
        /*
 
111
         * XXX: The MAC address in the command buffer is often changed from
 
112
         * the original sent to the device. That is, the MAC address
 
113
         * written to the command buffer often is not the same MAC address
 
114
         * read from the command buffer when the command returns. This
 
115
         * issue has not yet been resolved and this debugging is left to
 
116
         * observe the problem.
 
117
         */
 
118
        IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 
119
                       priv->stations[sta_id].sta.mode ==
 
120
                       STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 
121
                       addsta->sta.addr);
 
122
        spin_unlock_irqrestore(&priv->sta_lock, flags);
 
123
 
 
124
        return ret;
 
125
}
 
126
 
 
127
static void iwl_legacy_add_sta_callback(struct iwl_priv *priv,
 
128
                                 struct iwl_device_cmd *cmd,
 
129
                                 struct iwl_rx_packet *pkt)
 
130
{
 
131
        struct iwl_legacy_addsta_cmd *addsta =
 
132
                (struct iwl_legacy_addsta_cmd *)cmd->cmd.payload;
 
133
 
 
134
        iwl_legacy_process_add_sta_resp(priv, addsta, pkt, false);
 
135
 
 
136
}
 
137
 
 
138
int iwl_legacy_send_add_sta(struct iwl_priv *priv,
 
139
                     struct iwl_legacy_addsta_cmd *sta, u8 flags)
 
140
{
 
141
        struct iwl_rx_packet *pkt = NULL;
 
142
        int ret = 0;
 
143
        u8 data[sizeof(*sta)];
 
144
        struct iwl_host_cmd cmd = {
 
145
                .id = REPLY_ADD_STA,
 
146
                .flags = flags,
 
147
                .data = data,
 
148
        };
 
149
        u8 sta_id __maybe_unused = sta->sta.sta_id;
 
150
 
 
151
        IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 
152
                       sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 
153
 
 
154
        if (flags & CMD_ASYNC)
 
155
                cmd.callback = iwl_legacy_add_sta_callback;
 
156
        else {
 
157
                cmd.flags |= CMD_WANT_SKB;
 
158
                might_sleep();
 
159
        }
 
160
 
 
161
        cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
 
162
        ret = iwl_legacy_send_cmd(priv, &cmd);
 
163
 
 
164
        if (ret || (flags & CMD_ASYNC))
 
165
                return ret;
 
166
 
 
167
        if (ret == 0) {
 
168
                pkt = (struct iwl_rx_packet *)cmd.reply_page;
 
169
                ret = iwl_legacy_process_add_sta_resp(priv, sta, pkt, true);
 
170
        }
 
171
        iwl_legacy_free_pages(priv, cmd.reply_page);
 
172
 
 
173
        return ret;
 
174
}
 
175
EXPORT_SYMBOL(iwl_legacy_send_add_sta);
 
176
 
 
177
static void iwl_legacy_set_ht_add_station(struct iwl_priv *priv, u8 index,
 
178
                                   struct ieee80211_sta *sta,
 
179
                                   struct iwl_rxon_context *ctx)
 
180
{
 
181
        struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 
182
        __le32 sta_flags;
 
183
        u8 mimo_ps_mode;
 
184
 
 
185
        if (!sta || !sta_ht_inf->ht_supported)
 
186
                goto done;
 
187
 
 
188
        mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 
189
        IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 
190
                        (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 
191
                        "static" :
 
192
                        (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 
193
                        "dynamic" : "disabled");
 
194
 
 
195
        sta_flags = priv->stations[index].sta.station_flags;
 
196
 
 
197
        sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 
198
 
 
199
        switch (mimo_ps_mode) {
 
200
        case WLAN_HT_CAP_SM_PS_STATIC:
 
201
                sta_flags |= STA_FLG_MIMO_DIS_MSK;
 
202
                break;
 
203
        case WLAN_HT_CAP_SM_PS_DYNAMIC:
 
204
                sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 
205
                break;
 
206
        case WLAN_HT_CAP_SM_PS_DISABLED:
 
207
                break;
 
208
        default:
 
209
                IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 
210
                break;
 
211
        }
 
212
 
 
213
        sta_flags |= cpu_to_le32(
 
214
              (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 
215
 
 
216
        sta_flags |= cpu_to_le32(
 
217
              (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 
218
 
 
219
        if (iwl_legacy_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
 
220
                sta_flags |= STA_FLG_HT40_EN_MSK;
 
221
        else
 
222
                sta_flags &= ~STA_FLG_HT40_EN_MSK;
 
223
 
 
224
        priv->stations[index].sta.station_flags = sta_flags;
 
225
 done:
 
226
        return;
 
227
}
 
228
 
 
229
/**
 
230
 * iwl_legacy_prep_station - Prepare station information for addition
 
231
 *
 
232
 * should be called with sta_lock held
 
233
 */
 
234
u8 iwl_legacy_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 
235
                    const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 
236
{
 
237
        struct iwl_station_entry *station;
 
238
        int i;
 
239
        u8 sta_id = IWL_INVALID_STATION;
 
240
        u16 rate;
 
241
 
 
242
        if (is_ap)
 
243
                sta_id = ctx->ap_sta_id;
 
244
        else if (is_broadcast_ether_addr(addr))
 
245
                sta_id = ctx->bcast_sta_id;
 
246
        else
 
247
                for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 
248
                        if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 
249
                                                addr)) {
 
250
                                sta_id = i;
 
251
                                break;
 
252
                        }
 
253
 
 
254
                        if (!priv->stations[i].used &&
 
255
                            sta_id == IWL_INVALID_STATION)
 
256
                                sta_id = i;
 
257
                }
 
258
 
 
259
        /*
 
260
         * These two conditions have the same outcome, but keep them
 
261
         * separate
 
262
         */
 
263
        if (unlikely(sta_id == IWL_INVALID_STATION))
 
264
                return sta_id;
 
265
 
 
266
        /*
 
267
         * uCode is not able to deal with multiple requests to add a
 
268
         * station. Keep track if one is in progress so that we do not send
 
269
         * another.
 
270
         */
 
271
        if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 
272
                IWL_DEBUG_INFO(priv,
 
273
                                "STA %d already in process of being added.\n",
 
274
                                sta_id);
 
275
                return sta_id;
 
276
        }
 
277
 
 
278
        if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 
279
            (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 
280
            !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 
281
                IWL_DEBUG_ASSOC(priv,
 
282
                                "STA %d (%pM) already added, not adding again.\n",
 
283
                                sta_id, addr);
 
284
                return sta_id;
 
285
        }
 
286
 
 
287
        station = &priv->stations[sta_id];
 
288
        station->used = IWL_STA_DRIVER_ACTIVE;
 
289
        IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 
290
                        sta_id, addr);
 
291
        priv->num_stations++;
 
292
 
 
293
        /* Set up the REPLY_ADD_STA command to send to device */
 
294
        memset(&station->sta, 0, sizeof(struct iwl_legacy_addsta_cmd));
 
295
        memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 
296
        station->sta.mode = 0;
 
297
        station->sta.sta.sta_id = sta_id;
 
298
        station->sta.station_flags = ctx->station_flags;
 
299
        station->ctxid = ctx->ctxid;
 
300
 
 
301
        if (sta) {
 
302
                struct iwl_station_priv_common *sta_priv;
 
303
 
 
304
                sta_priv = (void *)sta->drv_priv;
 
305
                sta_priv->ctx = ctx;
 
306
        }
 
307
 
 
308
        /*
 
309
         * OK to call unconditionally, since local stations (IBSS BSSID
 
310
         * STA and broadcast STA) pass in a NULL sta, and mac80211
 
311
         * doesn't allow HT IBSS.
 
312
         */
 
313
        iwl_legacy_set_ht_add_station(priv, sta_id, sta, ctx);
 
314
 
 
315
        /* 3945 only */
 
316
        rate = (priv->band == IEEE80211_BAND_5GHZ) ?
 
317
                IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
 
318
        /* Turn on both antennas for the station... */
 
319
        station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 
320
 
 
321
        return sta_id;
 
322
 
 
323
}
 
324
EXPORT_SYMBOL_GPL(iwl_legacy_prep_station);
 
325
 
 
326
#define STA_WAIT_TIMEOUT (HZ/2)
 
327
 
 
328
/**
 
329
 * iwl_legacy_add_station_common -
 
330
 */
 
331
int
 
332
iwl_legacy_add_station_common(struct iwl_priv *priv,
 
333
                        struct iwl_rxon_context *ctx,
 
334
                           const u8 *addr, bool is_ap,
 
335
                           struct ieee80211_sta *sta, u8 *sta_id_r)
 
336
{
 
337
        unsigned long flags_spin;
 
338
        int ret = 0;
 
339
        u8 sta_id;
 
340
        struct iwl_legacy_addsta_cmd sta_cmd;
 
341
 
 
342
        *sta_id_r = 0;
 
343
        spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
344
        sta_id = iwl_legacy_prep_station(priv, ctx, addr, is_ap, sta);
 
345
        if (sta_id == IWL_INVALID_STATION) {
 
346
                IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 
347
                        addr);
 
348
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
349
                return -EINVAL;
 
350
        }
 
351
 
 
352
        /*
 
353
         * uCode is not able to deal with multiple requests to add a
 
354
         * station. Keep track if one is in progress so that we do not send
 
355
         * another.
 
356
         */
 
357
        if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 
358
                IWL_DEBUG_INFO(priv,
 
359
                        "STA %d already in process of being added.\n",
 
360
                       sta_id);
 
361
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
362
                return -EEXIST;
 
363
        }
 
364
 
 
365
        if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 
366
            (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 
367
                IWL_DEBUG_ASSOC(priv,
 
368
                        "STA %d (%pM) already added, not adding again.\n",
 
369
                        sta_id, addr);
 
370
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
371
                return -EEXIST;
 
372
        }
 
373
 
 
374
        priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 
375
        memcpy(&sta_cmd, &priv->stations[sta_id].sta,
 
376
                                sizeof(struct iwl_legacy_addsta_cmd));
 
377
        spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
378
 
 
379
        /* Add station to device's station table */
 
380
        ret = iwl_legacy_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 
381
        if (ret) {
 
382
                spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
383
                IWL_ERR(priv, "Adding station %pM failed.\n",
 
384
                        priv->stations[sta_id].sta.sta.addr);
 
385
                priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 
386
                priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 
387
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
388
        }
 
389
        *sta_id_r = sta_id;
 
390
        return ret;
 
391
}
 
392
EXPORT_SYMBOL(iwl_legacy_add_station_common);
 
393
 
 
394
/**
 
395
 * iwl_legacy_sta_ucode_deactivate - deactivate ucode status for a station
 
396
 *
 
397
 * priv->sta_lock must be held
 
398
 */
 
399
static void iwl_legacy_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 
400
{
 
401
        /* Ucode must be active and driver must be non active */
 
402
        if ((priv->stations[sta_id].used &
 
403
             (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) !=
 
404
                                                IWL_STA_UCODE_ACTIVE)
 
405
                IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 
406
 
 
407
        priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 
408
 
 
409
        memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 
410
        IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 
411
}
 
412
 
 
413
static int iwl_legacy_send_remove_station(struct iwl_priv *priv,
 
414
                                   const u8 *addr, int sta_id,
 
415
                                   bool temporary)
 
416
{
 
417
        struct iwl_rx_packet *pkt;
 
418
        int ret;
 
419
 
 
420
        unsigned long flags_spin;
 
421
        struct iwl_rem_sta_cmd rm_sta_cmd;
 
422
 
 
423
        struct iwl_host_cmd cmd = {
 
424
                .id = REPLY_REMOVE_STA,
 
425
                .len = sizeof(struct iwl_rem_sta_cmd),
 
426
                .flags = CMD_SYNC,
 
427
                .data = &rm_sta_cmd,
 
428
        };
 
429
 
 
430
        memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 
431
        rm_sta_cmd.num_sta = 1;
 
432
        memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 
433
 
 
434
        cmd.flags |= CMD_WANT_SKB;
 
435
 
 
436
        ret = iwl_legacy_send_cmd(priv, &cmd);
 
437
 
 
438
        if (ret)
 
439
                return ret;
 
440
 
 
441
        pkt = (struct iwl_rx_packet *)cmd.reply_page;
 
442
        if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 
443
                IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 
444
                          pkt->hdr.flags);
 
445
                ret = -EIO;
 
446
        }
 
447
 
 
448
        if (!ret) {
 
449
                switch (pkt->u.rem_sta.status) {
 
450
                case REM_STA_SUCCESS_MSK:
 
451
                        if (!temporary) {
 
452
                                spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
453
                                iwl_legacy_sta_ucode_deactivate(priv, sta_id);
 
454
                                spin_unlock_irqrestore(&priv->sta_lock,
 
455
                                                                flags_spin);
 
456
                        }
 
457
                        IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 
458
                        break;
 
459
                default:
 
460
                        ret = -EIO;
 
461
                        IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 
462
                        break;
 
463
                }
 
464
        }
 
465
        iwl_legacy_free_pages(priv, cmd.reply_page);
 
466
 
 
467
        return ret;
 
468
}
 
469
 
 
470
/**
 
471
 * iwl_legacy_remove_station - Remove driver's knowledge of station.
 
472
 */
 
473
int iwl_legacy_remove_station(struct iwl_priv *priv, const u8 sta_id,
 
474
                       const u8 *addr)
 
475
{
 
476
        unsigned long flags;
 
477
 
 
478
        if (!iwl_legacy_is_ready(priv)) {
 
479
                IWL_DEBUG_INFO(priv,
 
480
                        "Unable to remove station %pM, device not ready.\n",
 
481
                        addr);
 
482
                /*
 
483
                 * It is typical for stations to be removed when we are
 
484
                 * going down. Return success since device will be down
 
485
                 * soon anyway
 
486
                 */
 
487
                return 0;
 
488
        }
 
489
 
 
490
        IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 
491
                        sta_id, addr);
 
492
 
 
493
        if (WARN_ON(sta_id == IWL_INVALID_STATION))
 
494
                return -EINVAL;
 
495
 
 
496
        spin_lock_irqsave(&priv->sta_lock, flags);
 
497
 
 
498
        if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 
499
                IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 
500
                                addr);
 
501
                goto out_err;
 
502
        }
 
503
 
 
504
        if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 
505
                IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 
506
                                addr);
 
507
                goto out_err;
 
508
        }
 
509
 
 
510
        if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 
511
                kfree(priv->stations[sta_id].lq);
 
512
                priv->stations[sta_id].lq = NULL;
 
513
        }
 
514
 
 
515
        priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 
516
 
 
517
        priv->num_stations--;
 
518
 
 
519
        BUG_ON(priv->num_stations < 0);
 
520
 
 
521
        spin_unlock_irqrestore(&priv->sta_lock, flags);
 
522
 
 
523
        return iwl_legacy_send_remove_station(priv, addr, sta_id, false);
 
524
out_err:
 
525
        spin_unlock_irqrestore(&priv->sta_lock, flags);
 
526
        return -EINVAL;
 
527
}
 
528
EXPORT_SYMBOL_GPL(iwl_legacy_remove_station);
 
529
 
 
530
/**
 
531
 * iwl_legacy_clear_ucode_stations - clear ucode station table bits
 
532
 *
 
533
 * This function clears all the bits in the driver indicating
 
534
 * which stations are active in the ucode. Call when something
 
535
 * other than explicit station management would cause this in
 
536
 * the ucode, e.g. unassociated RXON.
 
537
 */
 
538
void iwl_legacy_clear_ucode_stations(struct iwl_priv *priv,
 
539
                              struct iwl_rxon_context *ctx)
 
540
{
 
541
        int i;
 
542
        unsigned long flags_spin;
 
543
        bool cleared = false;
 
544
 
 
545
        IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 
546
 
 
547
        spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
548
        for (i = 0; i < priv->hw_params.max_stations; i++) {
 
549
                if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 
550
                        continue;
 
551
 
 
552
                if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 
553
                        IWL_DEBUG_INFO(priv,
 
554
                                "Clearing ucode active for station %d\n", i);
 
555
                        priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 
556
                        cleared = true;
 
557
                }
 
558
        }
 
559
        spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
560
 
 
561
        if (!cleared)
 
562
                IWL_DEBUG_INFO(priv,
 
563
                        "No active stations found to be cleared\n");
 
564
}
 
565
EXPORT_SYMBOL(iwl_legacy_clear_ucode_stations);
 
566
 
 
567
/**
 
568
 * iwl_legacy_restore_stations() - Restore driver known stations to device
 
569
 *
 
570
 * All stations considered active by driver, but not present in ucode, is
 
571
 * restored.
 
572
 *
 
573
 * Function sleeps.
 
574
 */
 
575
void
 
576
iwl_legacy_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 
577
{
 
578
        struct iwl_legacy_addsta_cmd sta_cmd;
 
579
        struct iwl_link_quality_cmd lq;
 
580
        unsigned long flags_spin;
 
581
        int i;
 
582
        bool found = false;
 
583
        int ret;
 
584
        bool send_lq;
 
585
 
 
586
        if (!iwl_legacy_is_ready(priv)) {
 
587
                IWL_DEBUG_INFO(priv,
 
588
                        "Not ready yet, not restoring any stations.\n");
 
589
                return;
 
590
        }
 
591
 
 
592
        IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 
593
        spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
594
        for (i = 0; i < priv->hw_params.max_stations; i++) {
 
595
                if (ctx->ctxid != priv->stations[i].ctxid)
 
596
                        continue;
 
597
                if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 
598
                            !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 
599
                        IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 
600
                                        priv->stations[i].sta.sta.addr);
 
601
                        priv->stations[i].sta.mode = 0;
 
602
                        priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 
603
                        found = true;
 
604
                }
 
605
        }
 
606
 
 
607
        for (i = 0; i < priv->hw_params.max_stations; i++) {
 
608
                if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 
609
                        memcpy(&sta_cmd, &priv->stations[i].sta,
 
610
                               sizeof(struct iwl_legacy_addsta_cmd));
 
611
                        send_lq = false;
 
612
                        if (priv->stations[i].lq) {
 
613
                                memcpy(&lq, priv->stations[i].lq,
 
614
                                       sizeof(struct iwl_link_quality_cmd));
 
615
                                send_lq = true;
 
616
                        }
 
617
                        spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
618
                        ret = iwl_legacy_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 
619
                        if (ret) {
 
620
                                spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
621
                                IWL_ERR(priv, "Adding station %pM failed.\n",
 
622
                                        priv->stations[i].sta.sta.addr);
 
623
                                priv->stations[i].used &=
 
624
                                                ~IWL_STA_DRIVER_ACTIVE;
 
625
                                priv->stations[i].used &=
 
626
                                                ~IWL_STA_UCODE_INPROGRESS;
 
627
                                spin_unlock_irqrestore(&priv->sta_lock,
 
628
                                                                flags_spin);
 
629
                        }
 
630
                        /*
 
631
                         * Rate scaling has already been initialized, send
 
632
                         * current LQ command
 
633
                         */
 
634
                        if (send_lq)
 
635
                                iwl_legacy_send_lq_cmd(priv, ctx, &lq,
 
636
                                                                CMD_SYNC, true);
 
637
                        spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
638
                        priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 
639
                }
 
640
        }
 
641
 
 
642
        spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
643
        if (!found)
 
644
                IWL_DEBUG_INFO(priv, "Restoring all known stations"
 
645
                                " .... no stations to be restored.\n");
 
646
        else
 
647
                IWL_DEBUG_INFO(priv, "Restoring all known stations"
 
648
                                " .... complete.\n");
 
649
}
 
650
EXPORT_SYMBOL(iwl_legacy_restore_stations);
 
651
 
 
652
int iwl_legacy_get_free_ucode_key_index(struct iwl_priv *priv)
 
653
{
 
654
        int i;
 
655
 
 
656
        for (i = 0; i < priv->sta_key_max_num; i++)
 
657
                if (!test_and_set_bit(i, &priv->ucode_key_table))
 
658
                        return i;
 
659
 
 
660
        return WEP_INVALID_OFFSET;
 
661
}
 
662
EXPORT_SYMBOL(iwl_legacy_get_free_ucode_key_index);
 
663
 
 
664
void iwl_legacy_dealloc_bcast_stations(struct iwl_priv *priv)
 
665
{
 
666
        unsigned long flags;
 
667
        int i;
 
668
 
 
669
        spin_lock_irqsave(&priv->sta_lock, flags);
 
670
        for (i = 0; i < priv->hw_params.max_stations; i++) {
 
671
                if (!(priv->stations[i].used & IWL_STA_BCAST))
 
672
                        continue;
 
673
 
 
674
                priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 
675
                priv->num_stations--;
 
676
                BUG_ON(priv->num_stations < 0);
 
677
                kfree(priv->stations[i].lq);
 
678
                priv->stations[i].lq = NULL;
 
679
        }
 
680
        spin_unlock_irqrestore(&priv->sta_lock, flags);
 
681
}
 
682
EXPORT_SYMBOL_GPL(iwl_legacy_dealloc_bcast_stations);
 
683
 
 
684
#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
 
685
static void iwl_legacy_dump_lq_cmd(struct iwl_priv *priv,
 
686
                           struct iwl_link_quality_cmd *lq)
 
687
{
 
688
        int i;
 
689
        IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 
690
        IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 
691
                       lq->general_params.single_stream_ant_msk,
 
692
                       lq->general_params.dual_stream_ant_msk);
 
693
 
 
694
        for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 
695
                IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 
696
                               i, lq->rs_table[i].rate_n_flags);
 
697
}
 
698
#else
 
699
static inline void iwl_legacy_dump_lq_cmd(struct iwl_priv *priv,
 
700
                                   struct iwl_link_quality_cmd *lq)
 
701
{
 
702
}
 
703
#endif
 
704
 
 
705
/**
 
706
 * iwl_legacy_is_lq_table_valid() - Test one aspect of LQ cmd for validity
 
707
 *
 
708
 * It sometimes happens when a HT rate has been in use and we
 
709
 * loose connectivity with AP then mac80211 will first tell us that the
 
710
 * current channel is not HT anymore before removing the station. In such a
 
711
 * scenario the RXON flags will be updated to indicate we are not
 
712
 * communicating HT anymore, but the LQ command may still contain HT rates.
 
713
 * Test for this to prevent driver from sending LQ command between the time
 
714
 * RXON flags are updated and when LQ command is updated.
 
715
 */
 
716
static bool iwl_legacy_is_lq_table_valid(struct iwl_priv *priv,
 
717
                              struct iwl_rxon_context *ctx,
 
718
                              struct iwl_link_quality_cmd *lq)
 
719
{
 
720
        int i;
 
721
 
 
722
        if (ctx->ht.enabled)
 
723
                return true;
 
724
 
 
725
        IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 
726
                       ctx->active.channel);
 
727
        for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 
728
                if (le32_to_cpu(lq->rs_table[i].rate_n_flags) &
 
729
                                                RATE_MCS_HT_MSK) {
 
730
                        IWL_DEBUG_INFO(priv,
 
731
                                       "index %d of LQ expects HT channel\n",
 
732
                                       i);
 
733
                        return false;
 
734
                }
 
735
        }
 
736
        return true;
 
737
}
 
738
 
 
739
/**
 
740
 * iwl_legacy_send_lq_cmd() - Send link quality command
 
741
 * @init: This command is sent as part of station initialization right
 
742
 *        after station has been added.
 
743
 *
 
744
 * The link quality command is sent as the last step of station creation.
 
745
 * This is the special case in which init is set and we call a callback in
 
746
 * this case to clear the state indicating that station creation is in
 
747
 * progress.
 
748
 */
 
749
int iwl_legacy_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 
750
                    struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 
751
{
 
752
        int ret = 0;
 
753
        unsigned long flags_spin;
 
754
 
 
755
        struct iwl_host_cmd cmd = {
 
756
                .id = REPLY_TX_LINK_QUALITY_CMD,
 
757
                .len = sizeof(struct iwl_link_quality_cmd),
 
758
                .flags = flags,
 
759
                .data = lq,
 
760
        };
 
761
 
 
762
        if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 
763
                return -EINVAL;
 
764
 
 
765
 
 
766
        spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
767
        if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 
768
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
769
                return -EINVAL;
 
770
        }
 
771
        spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
772
 
 
773
        iwl_legacy_dump_lq_cmd(priv, lq);
 
774
        BUG_ON(init && (cmd.flags & CMD_ASYNC));
 
775
 
 
776
        if (iwl_legacy_is_lq_table_valid(priv, ctx, lq))
 
777
                ret = iwl_legacy_send_cmd(priv, &cmd);
 
778
        else
 
779
                ret = -EINVAL;
 
780
 
 
781
        if (cmd.flags & CMD_ASYNC)
 
782
                return ret;
 
783
 
 
784
        if (init) {
 
785
                IWL_DEBUG_INFO(priv, "init LQ command complete,"
 
786
                                " clearing sta addition status for sta %d\n",
 
787
                               lq->sta_id);
 
788
                spin_lock_irqsave(&priv->sta_lock, flags_spin);
 
789
                priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 
790
                spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 
791
        }
 
792
        return ret;
 
793
}
 
794
EXPORT_SYMBOL(iwl_legacy_send_lq_cmd);
 
795
 
 
796
int iwl_legacy_mac_sta_remove(struct ieee80211_hw *hw,
 
797
                       struct ieee80211_vif *vif,
 
798
                       struct ieee80211_sta *sta)
 
799
{
 
800
        struct iwl_priv *priv = hw->priv;
 
801
        struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
 
802
        int ret;
 
803
 
 
804
        IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
 
805
                        sta->addr);
 
806
        mutex_lock(&priv->mutex);
 
807
        IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
 
808
                        sta->addr);
 
809
        ret = iwl_legacy_remove_station(priv, sta_common->sta_id, sta->addr);
 
810
        if (ret)
 
811
                IWL_ERR(priv, "Error removing station %pM\n",
 
812
                        sta->addr);
 
813
        mutex_unlock(&priv->mutex);
 
814
        return ret;
 
815
}
 
816
EXPORT_SYMBOL(iwl_legacy_mac_sta_remove);