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1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3  *
4  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
5  * Copyright(c) 2015 Intel Deutschland GmbH
6  * Copyright(c) 2018, 2020-2021 Intel Corporation
7  *
8  * Portions of this file are derived from the ipw3945 project, as well
9  * as portionhelp of the ieee80211 subsystem header files.
10  *****************************************************************************/
11
12 #include <linux/etherdevice.h>
13 #include <linux/slab.h>
14 #include <linux/sched.h>
15 #include <net/mac80211.h>
16 #include <linux/unaligned.h>
17
18 #include "iwl-trans.h"
19 #include "iwl-io.h"
20 #include "dev.h"
21 #include "calib.h"
22 #include "agn.h"
23
24 /******************************************************************************
25  *
26  * Generic RX handler implementations
27  *
28  ******************************************************************************/
29
30 static void iwlagn_rx_reply_error(struct iwl_priv *priv,
31                                   struct iwl_rx_cmd_buffer *rxb)
32 {
33         struct iwl_rx_packet *pkt = rxb_addr(rxb);
34         struct iwl_error_resp *err_resp = (void *)pkt->data;
35
36         IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) "
37                 "seq 0x%04X ser 0x%08X\n",
38                 le32_to_cpu(err_resp->error_type),
39                 err_resp->cmd_id,
40                 le16_to_cpu(err_resp->bad_cmd_seq_num),
41                 le32_to_cpu(err_resp->error_info));
42 }
43
44 static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
45 {
46         struct iwl_rx_packet *pkt = rxb_addr(rxb);
47         struct iwl_csa_notification *csa = (void *)pkt->data;
48         /*
49          * MULTI-FIXME
50          * See iwlagn_mac_channel_switch.
51          */
52         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
53         struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
54
55         if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
56                 return;
57
58         if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
59                 rxon->channel = csa->channel;
60                 ctx->staging.channel = csa->channel;
61                 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
62                               le16_to_cpu(csa->channel));
63                 iwl_chswitch_done(priv, true);
64         } else {
65                 IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
66                         le16_to_cpu(csa->channel));
67                 iwl_chswitch_done(priv, false);
68         }
69 }
70
71
72 static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
73                                              struct iwl_rx_cmd_buffer *rxb)
74 {
75         struct iwl_rx_packet *pkt = rxb_addr(rxb);
76         struct iwl_spectrum_notification *report = (void *)pkt->data;
77
78         if (!report->state) {
79                 IWL_DEBUG_11H(priv,
80                         "Spectrum Measure Notification: Start\n");
81                 return;
82         }
83
84         memcpy(&priv->measure_report, report, sizeof(*report));
85         priv->measurement_status |= MEASUREMENT_READY;
86 }
87
88 static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
89                                      struct iwl_rx_cmd_buffer *rxb)
90 {
91 #ifdef CONFIG_IWLWIFI_DEBUG
92         struct iwl_rx_packet *pkt = rxb_addr(rxb);
93         struct iwl_sleep_notification *sleep = (void *)pkt->data;
94         IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
95                      sleep->pm_sleep_mode, sleep->pm_wakeup_src);
96 #endif
97 }
98
99 static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
100                                                 struct iwl_rx_cmd_buffer *rxb)
101 {
102         struct iwl_rx_packet *pkt = rxb_addr(rxb);
103         u32 __maybe_unused len = iwl_rx_packet_len(pkt);
104         IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
105                         "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len);
106         iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len);
107 }
108
109 static void iwlagn_rx_beacon_notif(struct iwl_priv *priv,
110                                    struct iwl_rx_cmd_buffer *rxb)
111 {
112         struct iwl_rx_packet *pkt = rxb_addr(rxb);
113         struct iwlagn_beacon_notif *beacon = (void *)pkt->data;
114 #ifdef CONFIG_IWLWIFI_DEBUG
115         u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
116         u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
117
118         IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
119                 "tsf:0x%.8x%.8x rate:%d\n",
120                 status & TX_STATUS_MSK,
121                 beacon->beacon_notify_hdr.failure_frame,
122                 le32_to_cpu(beacon->ibss_mgr_status),
123                 le32_to_cpu(beacon->high_tsf),
124                 le32_to_cpu(beacon->low_tsf), rate);
125 #endif
126
127         priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
128 }
129
130 /*
131  * iwl_good_plcp_health - checks for plcp error.
132  *
133  * When the plcp error is exceeding the thresholds, reset the radio
134  * to improve the throughput.
135  */
136 static bool iwlagn_good_plcp_health(struct iwl_priv *priv,
137                                  struct statistics_rx_phy *cur_ofdm,
138                                  struct statistics_rx_ht_phy *cur_ofdm_ht,
139                                  unsigned int msecs)
140 {
141         int delta;
142         int threshold = priv->plcp_delta_threshold;
143
144         if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
145                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
146                 return true;
147         }
148
149         delta = le32_to_cpu(cur_ofdm->plcp_err) -
150                 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
151                 le32_to_cpu(cur_ofdm_ht->plcp_err) -
152                 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
153
154         /* Can be negative if firmware reset statistics */
155         if (delta <= 0)
156                 return true;
157
158         if ((delta * 100 / msecs) > threshold) {
159                 IWL_DEBUG_RADIO(priv,
160                                 "plcp health threshold %u delta %d msecs %u\n",
161                                 threshold, delta, msecs);
162                 return false;
163         }
164
165         return true;
166 }
167
168 int iwl_force_rf_reset(struct iwl_priv *priv, bool external)
169 {
170         struct iwl_rf_reset *rf_reset;
171
172         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
173                 return -EAGAIN;
174
175         if (!iwl_is_any_associated(priv)) {
176                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
177                 return -ENOLINK;
178         }
179
180         rf_reset = &priv->rf_reset;
181         rf_reset->reset_request_count++;
182         if (!external && rf_reset->last_reset_jiffies &&
183             time_after(rf_reset->last_reset_jiffies +
184                        IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) {
185                 IWL_DEBUG_INFO(priv, "RF reset rejected\n");
186                 rf_reset->reset_reject_count++;
187                 return -EAGAIN;
188         }
189         rf_reset->reset_success_count++;
190         rf_reset->last_reset_jiffies = jiffies;
191
192         /*
193          * There is no easy and better way to force reset the radio,
194          * the only known method is switching channel which will force to
195          * reset and tune the radio.
196          * Use internal short scan (single channel) operation to should
197          * achieve this objective.
198          * Driver should reset the radio when number of consecutive missed
199          * beacon, or any other uCode error condition detected.
200          */
201         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
202         iwl_internal_short_hw_scan(priv);
203         return 0;
204 }
205
206
207 static void iwlagn_recover_from_statistics(struct iwl_priv *priv,
208                                 struct statistics_rx_phy *cur_ofdm,
209                                 struct statistics_rx_ht_phy *cur_ofdm_ht,
210                                 struct statistics_tx *tx,
211                                 unsigned long stamp)
212 {
213         unsigned int msecs;
214
215         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
216                 return;
217
218         msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
219
220         /* Only gather statistics and update time stamp when not associated */
221         if (!iwl_is_any_associated(priv))
222                 return;
223
224         /* Do not check/recover when do not have enough statistics data */
225         if (msecs < 99)
226                 return;
227
228         if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
229                 iwl_force_rf_reset(priv, false);
230 }
231
232 /* Calculate noise level, based on measurements during network silence just
233  *   before arriving beacon.  This measurement can be done only if we know
234  *   exactly when to expect beacons, therefore only when we're associated. */
235 static void iwlagn_rx_calc_noise(struct iwl_priv *priv)
236 {
237         struct statistics_rx_non_phy *rx_info;
238         int num_active_rx = 0;
239         int total_silence = 0;
240         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
241         int last_rx_noise;
242
243         rx_info = &priv->statistics.rx_non_phy;
244
245         bcn_silence_a =
246                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
247         bcn_silence_b =
248                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
249         bcn_silence_c =
250                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
251
252         if (bcn_silence_a) {
253                 total_silence += bcn_silence_a;
254                 num_active_rx++;
255         }
256         if (bcn_silence_b) {
257                 total_silence += bcn_silence_b;
258                 num_active_rx++;
259         }
260         if (bcn_silence_c) {
261                 total_silence += bcn_silence_c;
262                 num_active_rx++;
263         }
264
265         /* Average among active antennas */
266         if (num_active_rx)
267                 last_rx_noise = (total_silence / num_active_rx) - 107;
268         else
269                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
270
271         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
272                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
273                         last_rx_noise);
274 }
275
276 #ifdef CONFIG_IWLWIFI_DEBUGFS
277 /*
278  *  based on the assumption of all statistics counter are in DWORD
279  *  FIXME: This function is for debugging, do not deal with
280  *  the case of counters roll-over.
281  */
282 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
283                         __le32 *max_delta, __le32 *accum, int size)
284 {
285         int i;
286
287         for (i = 0;
288              i < size / sizeof(__le32);
289              i++, prev++, cur++, delta++, max_delta++, accum++) {
290                 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
291                         *delta = cpu_to_le32(
292                                 le32_to_cpu(*cur) - le32_to_cpu(*prev));
293                         le32_add_cpu(accum, le32_to_cpu(*delta));
294                         if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
295                                 *max_delta = *delta;
296                 }
297         }
298 }
299
300 static void
301 iwlagn_accumulative_statistics(struct iwl_priv *priv,
302                             struct statistics_general_common *common,
303                             struct statistics_rx_non_phy *rx_non_phy,
304                             struct statistics_rx_phy *rx_ofdm,
305                             struct statistics_rx_ht_phy *rx_ofdm_ht,
306                             struct statistics_rx_phy *rx_cck,
307                             struct statistics_tx *tx,
308                             struct statistics_bt_activity *bt_activity)
309 {
310 #define ACCUM(_name)    \
311         accum_stats((__le32 *)&priv->statistics._name,          \
312                     (__le32 *)_name,                            \
313                     (__le32 *)&priv->delta_stats._name,         \
314                     (__le32 *)&priv->max_delta_stats._name,     \
315                     (__le32 *)&priv->accum_stats._name,         \
316                     sizeof(*_name))
317
318         ACCUM(common);
319         ACCUM(rx_non_phy);
320         ACCUM(rx_ofdm);
321         ACCUM(rx_ofdm_ht);
322         ACCUM(rx_cck);
323         ACCUM(tx);
324         if (bt_activity)
325                 ACCUM(bt_activity);
326 #undef ACCUM
327 }
328 #else
329 static inline void
330 iwlagn_accumulative_statistics(struct iwl_priv *priv,
331                             struct statistics_general_common *common,
332                             struct statistics_rx_non_phy *rx_non_phy,
333                             struct statistics_rx_phy *rx_ofdm,
334                             struct statistics_rx_ht_phy *rx_ofdm_ht,
335                             struct statistics_rx_phy *rx_cck,
336                             struct statistics_tx *tx,
337                             struct statistics_bt_activity *bt_activity)
338 {
339 }
340 #endif
341
342 static void iwlagn_rx_statistics(struct iwl_priv *priv,
343                                  struct iwl_rx_cmd_buffer *rxb)
344 {
345         unsigned long stamp = jiffies;
346         const int reg_recalib_period = 60;
347         int change;
348         struct iwl_rx_packet *pkt = rxb_addr(rxb);
349         u32 len = iwl_rx_packet_payload_len(pkt);
350         __le32 *flag;
351         struct statistics_general_common *common;
352         struct statistics_rx_non_phy *rx_non_phy;
353         struct statistics_rx_phy *rx_ofdm;
354         struct statistics_rx_ht_phy *rx_ofdm_ht;
355         struct statistics_rx_phy *rx_cck;
356         struct statistics_tx *tx;
357         struct statistics_bt_activity *bt_activity;
358
359         IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
360                      len);
361
362         spin_lock(&priv->statistics.lock);
363
364         if (len == sizeof(struct iwl_bt_notif_statistics)) {
365                 struct iwl_bt_notif_statistics *stats;
366                 stats = (void *)&pkt->data;
367                 flag = &stats->flag;
368                 common = &stats->general.common;
369                 rx_non_phy = &stats->rx.general.common;
370                 rx_ofdm = &stats->rx.ofdm;
371                 rx_ofdm_ht = &stats->rx.ofdm_ht;
372                 rx_cck = &stats->rx.cck;
373                 tx = &stats->tx;
374                 bt_activity = &stats->general.activity;
375
376 #ifdef CONFIG_IWLWIFI_DEBUGFS
377                 /* handle this exception directly */
378                 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
379                 le32_add_cpu(&priv->statistics.accum_num_bt_kills,
380                              le32_to_cpu(stats->rx.general.num_bt_kills));
381 #endif
382         } else if (len == sizeof(struct iwl_notif_statistics)) {
383                 struct iwl_notif_statistics *stats;
384                 stats = (void *)&pkt->data;
385                 flag = &stats->flag;
386                 common = &stats->general.common;
387                 rx_non_phy = &stats->rx.general;
388                 rx_ofdm = &stats->rx.ofdm;
389                 rx_ofdm_ht = &stats->rx.ofdm_ht;
390                 rx_cck = &stats->rx.cck;
391                 tx = &stats->tx;
392                 bt_activity = NULL;
393         } else {
394                 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
395                           len, sizeof(struct iwl_bt_notif_statistics),
396                           sizeof(struct iwl_notif_statistics));
397                 spin_unlock(&priv->statistics.lock);
398                 return;
399         }
400
401         change = common->temperature != priv->statistics.common.temperature ||
402                  (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
403                  (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
404
405         iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
406                                     rx_ofdm_ht, rx_cck, tx, bt_activity);
407
408         iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
409
410         priv->statistics.flag = *flag;
411         memcpy(&priv->statistics.common, common, sizeof(*common));
412         memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
413         memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
414         memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
415         memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
416         memcpy(&priv->statistics.tx, tx, sizeof(*tx));
417 #ifdef CONFIG_IWLWIFI_DEBUGFS
418         if (bt_activity)
419                 memcpy(&priv->statistics.bt_activity, bt_activity,
420                         sizeof(*bt_activity));
421 #endif
422
423         priv->rx_statistics_jiffies = stamp;
424
425         set_bit(STATUS_STATISTICS, &priv->status);
426
427         /* Reschedule the statistics timer to occur in
428          * reg_recalib_period seconds to ensure we get a
429          * thermal update even if the uCode doesn't give
430          * us one */
431         mod_timer(&priv->statistics_periodic, jiffies +
432                   msecs_to_jiffies(reg_recalib_period * 1000));
433
434         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
435             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
436                 iwlagn_rx_calc_noise(priv);
437                 queue_work(priv->workqueue, &priv->run_time_calib_work);
438         }
439         if (priv->lib->temperature && change)
440                 priv->lib->temperature(priv);
441
442         spin_unlock(&priv->statistics.lock);
443 }
444
445 static void iwlagn_rx_reply_statistics(struct iwl_priv *priv,
446                                        struct iwl_rx_cmd_buffer *rxb)
447 {
448         struct iwl_rx_packet *pkt = rxb_addr(rxb);
449         struct iwl_notif_statistics *stats = (void *)pkt->data;
450
451         if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) {
452 #ifdef CONFIG_IWLWIFI_DEBUGFS
453                 memset(&priv->accum_stats, 0,
454                         sizeof(priv->accum_stats));
455                 memset(&priv->delta_stats, 0,
456                         sizeof(priv->delta_stats));
457                 memset(&priv->max_delta_stats, 0,
458                         sizeof(priv->max_delta_stats));
459 #endif
460                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
461         }
462
463         iwlagn_rx_statistics(priv, rxb);
464 }
465
466 /* Handle notification from uCode that card's power state is changing
467  * due to software, hardware, or critical temperature RFKILL */
468 static void iwlagn_rx_card_state_notif(struct iwl_priv *priv,
469                                        struct iwl_rx_cmd_buffer *rxb)
470 {
471         struct iwl_rx_packet *pkt = rxb_addr(rxb);
472         struct iwl_card_state_notif *card_state_notif = (void *)pkt->data;
473         u32 flags = le32_to_cpu(card_state_notif->flags);
474         unsigned long status = priv->status;
475
476         IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
477                           (flags & HW_CARD_DISABLED) ? "Kill" : "On",
478                           (flags & SW_CARD_DISABLED) ? "Kill" : "On",
479                           (flags & CT_CARD_DISABLED) ?
480                           "Reached" : "Not reached");
481
482         if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
483                      CT_CARD_DISABLED)) {
484
485                 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET,
486                             CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
487
488                 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
489                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
490
491                 if (!(flags & RXON_CARD_DISABLED)) {
492                         iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR,
493                                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
494                         iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C,
495                                         HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
496                 }
497                 if (flags & CT_CARD_DISABLED)
498                         iwl_tt_enter_ct_kill(priv);
499         }
500         if (!(flags & CT_CARD_DISABLED))
501                 iwl_tt_exit_ct_kill(priv);
502
503         if (flags & HW_CARD_DISABLED)
504                 set_bit(STATUS_RF_KILL_HW, &priv->status);
505         else
506                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
507
508
509         if (!(flags & RXON_CARD_DISABLED))
510                 iwl_scan_cancel(priv);
511
512         if ((test_bit(STATUS_RF_KILL_HW, &status) !=
513              test_bit(STATUS_RF_KILL_HW, &priv->status)))
514                 wiphy_rfkill_set_hw_state(priv->hw->wiphy,
515                         test_bit(STATUS_RF_KILL_HW, &priv->status));
516 }
517
518 static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
519                                           struct iwl_rx_cmd_buffer *rxb)
520
521 {
522         struct iwl_rx_packet *pkt = rxb_addr(rxb);
523         struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data;
524
525         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
526             priv->missed_beacon_threshold) {
527                 IWL_DEBUG_CALIB(priv,
528                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
529                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
530                     le32_to_cpu(missed_beacon->total_missed_becons),
531                     le32_to_cpu(missed_beacon->num_recvd_beacons),
532                     le32_to_cpu(missed_beacon->num_expected_beacons));
533                 if (!test_bit(STATUS_SCANNING, &priv->status))
534                         iwl_init_sensitivity(priv);
535         }
536 }
537
538 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
539  * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
540 static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
541                                    struct iwl_rx_cmd_buffer *rxb)
542 {
543         struct iwl_rx_packet *pkt = rxb_addr(rxb);
544
545         priv->last_phy_res_valid = true;
546         priv->ampdu_ref++;
547         memcpy(&priv->last_phy_res, pkt->data,
548                sizeof(struct iwl_rx_phy_res));
549 }
550
551 /*
552  * returns non-zero if packet should be dropped
553  */
554 static int iwlagn_set_decrypted_flag(struct iwl_priv *priv,
555                                   struct ieee80211_hdr *hdr,
556                                   u32 decrypt_res,
557                                   struct ieee80211_rx_status *stats)
558 {
559         u16 fc = le16_to_cpu(hdr->frame_control);
560
561         /*
562          * All contexts have the same setting here due to it being
563          * a module parameter, so OK to check any context.
564          */
565         if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
566                                                 RXON_FILTER_DIS_DECRYPT_MSK)
567                 return 0;
568
569         if (!(fc & IEEE80211_FCTL_PROTECTED))
570                 return 0;
571
572         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
573         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
574         case RX_RES_STATUS_SEC_TYPE_TKIP:
575                 /* The uCode has got a bad phase 1 Key, pushes the packet.
576                  * Decryption will be done in SW. */
577                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
578                     RX_RES_STATUS_BAD_KEY_TTAK)
579                         break;
580                 fallthrough;
581         case RX_RES_STATUS_SEC_TYPE_WEP:
582                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
583                     RX_RES_STATUS_BAD_ICV_MIC) {
584                         /* bad ICV, the packet is destroyed since the
585                          * decryption is inplace, drop it */
586                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
587                         return -1;
588                 }
589                 fallthrough;
590         case RX_RES_STATUS_SEC_TYPE_CCMP:
591                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
592                     RX_RES_STATUS_DECRYPT_OK) {
593                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
594                         stats->flag |= RX_FLAG_DECRYPTED;
595                 }
596                 break;
597
598         default:
599                 break;
600         }
601         return 0;
602 }
603
604 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
605                                         struct ieee80211_hdr *hdr,
606                                         u16 len,
607                                         u32 ampdu_status,
608                                         struct iwl_rx_cmd_buffer *rxb,
609                                         struct ieee80211_rx_status *stats)
610 {
611         struct sk_buff *skb;
612         __le16 fc = hdr->frame_control;
613         struct iwl_rxon_context *ctx;
614         unsigned int hdrlen, fraglen;
615
616         /* We only process data packets if the interface is open */
617         if (unlikely(!priv->is_open)) {
618                 IWL_DEBUG_DROP_LIMIT(priv,
619                     "Dropping packet while interface is not open.\n");
620                 return;
621         }
622
623         /* In case of HW accelerated crypto and bad decryption, drop */
624         if (!iwlwifi_mod_params.swcrypto &&
625             iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats))
626                 return;
627
628         /* Dont use dev_alloc_skb(), we'll have enough headroom once
629          * ieee80211_hdr pulled.
630          */
631         skb = alloc_skb(128, GFP_ATOMIC);
632         if (!skb) {
633                 IWL_ERR(priv, "alloc_skb failed\n");
634                 return;
635         }
636         /* If frame is small enough to fit in skb->head, pull it completely.
637          * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
638          * are more efficient.
639          */
640         hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
641
642         skb_put_data(skb, hdr, hdrlen);
643         fraglen = len - hdrlen;
644
645         if (fraglen) {
646                 int offset = (void *)hdr + hdrlen -
647                              rxb_addr(rxb) + rxb_offset(rxb);
648
649                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
650                                 fraglen, rxb->truesize);
651         }
652
653         /*
654         * Wake any queues that were stopped due to a passive channel tx
655         * failure. This can happen because the regulatory enforcement in
656         * the device waits for a beacon before allowing transmission,
657         * sometimes even after already having transmitted frames for the
658         * association because the new RXON may reset the information.
659         */
660         if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) {
661                 for_each_context(priv, ctx) {
662                         if (!ether_addr_equal(hdr->addr3,
663                                               ctx->active.bssid_addr))
664                                 continue;
665                         iwlagn_lift_passive_no_rx(priv);
666                 }
667         }
668
669         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
670
671         ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi);
672 }
673
674 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
675 {
676         u32 decrypt_out = 0;
677
678         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
679                                         RX_RES_STATUS_STATION_FOUND)
680                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
681                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
682
683         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
684
685         /* packet was not encrypted */
686         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
687                                         RX_RES_STATUS_SEC_TYPE_NONE)
688                 return decrypt_out;
689
690         /* packet was encrypted with unknown alg */
691         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
692                                         RX_RES_STATUS_SEC_TYPE_ERR)
693                 return decrypt_out;
694
695         /* decryption was not done in HW */
696         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
697                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
698                 return decrypt_out;
699
700         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
701
702         case RX_RES_STATUS_SEC_TYPE_CCMP:
703                 /* alg is CCM: check MIC only */
704                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
705                         /* Bad MIC */
706                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
707                 else
708                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
709
710                 break;
711
712         case RX_RES_STATUS_SEC_TYPE_TKIP:
713                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
714                         /* Bad TTAK */
715                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
716                         break;
717                 }
718                 fallthrough;
719         default:
720                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
721                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
722                 else
723                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
724                 break;
725         }
726
727         IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
728                                         decrypt_in, decrypt_out);
729
730         return decrypt_out;
731 }
732
733 /* Calc max signal level (dBm) among 3 possible receivers */
734 static int iwlagn_calc_rssi(struct iwl_priv *priv,
735                              struct iwl_rx_phy_res *rx_resp)
736 {
737         /* data from PHY/DSP regarding signal strength, etc.,
738          *   contents are always there, not configurable by host
739          */
740         struct iwlagn_non_cfg_phy *ncphy =
741                 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
742         u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
743         u8 agc;
744
745         val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
746         agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;
747
748         /* Find max rssi among 3 possible receivers.
749          * These values are measured by the digital signal processor (DSP).
750          * They should stay fairly constant even as the signal strength varies,
751          *   if the radio's automatic gain control (AGC) is working right.
752          * AGC value (see below) will provide the "interesting" info.
753          */
754         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
755         rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
756                 IWLAGN_OFDM_RSSI_A_BIT_POS;
757         rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
758                 IWLAGN_OFDM_RSSI_B_BIT_POS;
759         val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
760         rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
761                 IWLAGN_OFDM_RSSI_C_BIT_POS;
762
763         max_rssi = max_t(u32, rssi_a, rssi_b);
764         max_rssi = max_t(u32, max_rssi, rssi_c);
765
766         IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
767                 rssi_a, rssi_b, rssi_c, max_rssi, agc);
768
769         /* dBm = max_rssi dB - agc dB - constant.
770          * Higher AGC (higher radio gain) means lower signal. */
771         return max_rssi - agc - IWLAGN_RSSI_OFFSET;
772 }
773
774 /* Called for REPLY_RX_MPDU_CMD */
775 static void iwlagn_rx_reply_rx(struct iwl_priv *priv,
776                                struct iwl_rx_cmd_buffer *rxb)
777 {
778         struct ieee80211_hdr *header;
779         struct ieee80211_rx_status rx_status = {};
780         struct iwl_rx_packet *pkt = rxb_addr(rxb);
781         struct iwl_rx_phy_res *phy_res;
782         __le32 rx_pkt_status;
783         struct iwl_rx_mpdu_res_start *amsdu;
784         u32 len, pkt_len = iwl_rx_packet_len(pkt);
785         u32 ampdu_status;
786         u32 rate_n_flags;
787
788         if (!priv->last_phy_res_valid) {
789                 IWL_ERR(priv, "MPDU frame without cached PHY data\n");
790                 return;
791         }
792
793         if (unlikely(pkt_len < sizeof(*amsdu))) {
794                 IWL_DEBUG_DROP(priv, "Bad REPLY_RX_MPDU_CMD size\n");
795                 return;
796         }
797
798         phy_res = &priv->last_phy_res;
799         amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data;
800         header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu));
801         len = le16_to_cpu(amsdu->byte_count);
802
803         if (unlikely(len + sizeof(*amsdu) + sizeof(__le32) > pkt_len)) {
804                 IWL_DEBUG_DROP(priv, "FW lied about packet len\n");
805                 return;
806         }
807
808         rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len);
809         ampdu_status = iwlagn_translate_rx_status(priv,
810                                                   le32_to_cpu(rx_pkt_status));
811
812         if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
813                 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n",
814                                 phy_res->cfg_phy_cnt);
815                 return;
816         }
817
818         if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
819             !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
820                 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
821                                 le32_to_cpu(rx_pkt_status));
822                 return;
823         }
824
825         /* This will be used in several places later */
826         rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);
827
828         /* rx_status carries information about the packet to mac80211 */
829         rx_status.mactime = le64_to_cpu(phy_res->timestamp);
830         rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
831                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
832         rx_status.freq =
833                 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
834                                                rx_status.band);
835         rx_status.rate_idx =
836                 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
837         rx_status.flag = 0;
838
839         /* TSF isn't reliable. In order to allow smooth user experience,
840          * this W/A doesn't propagate it to the mac80211 */
841         /*rx_status.flag |= RX_FLAG_MACTIME_START;*/
842
843         priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);
844
845         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
846         rx_status.signal = iwlagn_calc_rssi(priv, phy_res);
847
848         IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
849                 rx_status.signal, (unsigned long long)rx_status.mactime);
850
851         /*
852          * "antenna number"
853          *
854          * It seems that the antenna field in the phy flags value
855          * is actually a bit field. This is undefined by radiotap,
856          * it wants an actual antenna number but I always get "7"
857          * for most legacy frames I receive indicating that the
858          * same frame was received on all three RX chains.
859          *
860          * I think this field should be removed in favor of a
861          * new 802.11n radiotap field "RX chains" that is defined
862          * as a bitmask.
863          */
864         rx_status.antenna =
865                 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
866                 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
867
868         /* set the preamble flag if appropriate */
869         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
870                 rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE;
871
872         if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) {
873                 /*
874                  * We know which subframes of an A-MPDU belong
875                  * together since we get a single PHY response
876                  * from the firmware for all of them
877                  */
878                 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
879                 rx_status.ampdu_reference = priv->ampdu_ref;
880         }
881
882         /* Set up the HT phy flags */
883         if (rate_n_flags & RATE_MCS_HT_MSK)
884                 rx_status.encoding = RX_ENC_HT;
885         if (rate_n_flags & RATE_MCS_HT40_MSK)
886                 rx_status.bw = RATE_INFO_BW_40;
887         else
888                 rx_status.bw = RATE_INFO_BW_20;
889         if (rate_n_flags & RATE_MCS_SGI_MSK)
890                 rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI;
891         if (rate_n_flags & RATE_MCS_GF_MSK)
892                 rx_status.enc_flags |= RX_ENC_FLAG_HT_GF;
893
894         iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
895                                     rxb, &rx_status);
896 }
897
898 static void iwlagn_rx_noa_notification(struct iwl_priv *priv,
899                                        struct iwl_rx_cmd_buffer *rxb)
900 {
901         struct iwl_wipan_noa_data *new_data, *old_data;
902         struct iwl_rx_packet *pkt = rxb_addr(rxb);
903         struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data;
904
905         /* no condition -- we're in softirq */
906         old_data = rcu_dereference_protected(priv->noa_data, true);
907
908         if (noa_notif->noa_active) {
909                 u32 len = le16_to_cpu(noa_notif->noa_attribute.length);
910                 u32 copylen = len;
911
912                 /* EID, len, OUI, subtype */
913                 len += 1 + 1 + 3 + 1;
914                 /* P2P id, P2P length */
915                 len += 1 + 2;
916                 copylen += 1 + 2;
917
918                 new_data = kmalloc(struct_size(new_data, data, len), GFP_ATOMIC);
919                 if (new_data) {
920                         new_data->length = len;
921                         new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
922                         new_data->data[1] = len - 2; /* not counting EID, len */
923                         new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff;
924                         new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff;
925                         new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff;
926                         new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P;
927                         memcpy(&new_data->data[6], &noa_notif->noa_attribute,
928                                copylen);
929                 }
930         } else
931                 new_data = NULL;
932
933         rcu_assign_pointer(priv->noa_data, new_data);
934
935         if (old_data)
936                 kfree_rcu(old_data, rcu_head);
937 }
938
939 /*
940  * iwl_setup_rx_handlers - Initialize Rx handler callbacks
941  *
942  * Setup the RX handlers for each of the reply types sent from the uCode
943  * to the host.
944  */
945 void iwl_setup_rx_handlers(struct iwl_priv *priv)
946 {
947         void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb);
948
949         handlers = priv->rx_handlers;
950
951         handlers[REPLY_ERROR]                   = iwlagn_rx_reply_error;
952         handlers[CHANNEL_SWITCH_NOTIFICATION]   = iwlagn_rx_csa;
953         handlers[SPECTRUM_MEASURE_NOTIFICATION] =
954                 iwlagn_rx_spectrum_measure_notif;
955         handlers[PM_SLEEP_NOTIFICATION]         = iwlagn_rx_pm_sleep_notif;
956         handlers[PM_DEBUG_STATISTIC_NOTIFIC]    =
957                 iwlagn_rx_pm_debug_statistics_notif;
958         handlers[BEACON_NOTIFICATION]           = iwlagn_rx_beacon_notif;
959         handlers[REPLY_ADD_STA]                 = iwl_add_sta_callback;
960
961         handlers[REPLY_WIPAN_NOA_NOTIFICATION]  = iwlagn_rx_noa_notification;
962
963         /*
964          * The same handler is used for both the REPLY to a discrete
965          * statistics request from the host as well as for the periodic
966          * statistics notifications (after received beacons) from the uCode.
967          */
968         handlers[REPLY_STATISTICS_CMD]          = iwlagn_rx_reply_statistics;
969         handlers[STATISTICS_NOTIFICATION]       = iwlagn_rx_statistics;
970
971         iwl_setup_rx_scan_handlers(priv);
972
973         handlers[CARD_STATE_NOTIFICATION]       = iwlagn_rx_card_state_notif;
974         handlers[MISSED_BEACONS_NOTIFICATION]   =
975                 iwlagn_rx_missed_beacon_notif;
976
977         /* Rx handlers */
978         handlers[REPLY_RX_PHY_CMD]              = iwlagn_rx_reply_rx_phy;
979         handlers[REPLY_RX_MPDU_CMD]             = iwlagn_rx_reply_rx;
980
981         /* block ack */
982         handlers[REPLY_COMPRESSED_BA]           =
983                 iwlagn_rx_reply_compressed_ba;
984
985         priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
986
987         /* set up notification wait support */
988         iwl_notification_wait_init(&priv->notif_wait);
989
990         /* Set up BT Rx handlers */
991         if (priv->lib->bt_params)
992                 iwlagn_bt_rx_handler_setup(priv);
993 }
994
995 void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi,
996                      struct iwl_rx_cmd_buffer *rxb)
997 {
998         struct iwl_rx_packet *pkt = rxb_addr(rxb);
999         struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
1000
1001         /*
1002          * Do the notification wait before RX handlers so
1003          * even if the RX handler consumes the RXB we have
1004          * access to it in the notification wait entry.
1005          */
1006         iwl_notification_wait_notify(&priv->notif_wait, pkt);
1007
1008         /* Based on type of command response or notification,
1009          *   handle those that need handling via function in
1010          *   rx_handlers table.  See iwl_setup_rx_handlers() */
1011         if (priv->rx_handlers[pkt->hdr.cmd]) {
1012                 priv->rx_handlers_stats[pkt->hdr.cmd]++;
1013                 priv->rx_handlers[pkt->hdr.cmd](priv, rxb);
1014         } else {
1015                 /* No handling needed */
1016                 IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n",
1017                              iwl_get_cmd_string(priv->trans,
1018                                                 WIDE_ID(0, pkt->hdr.cmd)),
1019                              pkt->hdr.cmd);
1020         }
1021 }
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