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 <asm/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
iwlagn_rx_reply_error(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_csa(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_spectrum_measure_notif(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_pm_sleep_notif(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_beacon_notif(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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 */
iwlagn_good_plcp_health(struct iwl_priv * priv,struct statistics_rx_phy * cur_ofdm,struct statistics_rx_ht_phy * cur_ofdm_ht,unsigned int msecs)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
iwl_force_rf_reset(struct iwl_priv * priv,bool external)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
iwlagn_recover_from_statistics(struct iwl_priv * priv,struct statistics_rx_phy * cur_ofdm,struct statistics_rx_ht_phy * cur_ofdm_ht,struct statistics_tx * tx,unsigned long stamp)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. */
iwlagn_rx_calc_noise(struct iwl_priv * priv)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 */
accum_stats(__le32 * prev,__le32 * cur,__le32 * delta,__le32 * max_delta,__le32 * accum,int size)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
iwlagn_accumulative_statistics(struct iwl_priv * priv,struct statistics_general_common * common,struct statistics_rx_non_phy * rx_non_phy,struct statistics_rx_phy * rx_ofdm,struct statistics_rx_ht_phy * rx_ofdm_ht,struct statistics_rx_phy * rx_cck,struct statistics_tx * tx,struct statistics_bt_activity * bt_activity)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
iwlagn_accumulative_statistics(struct iwl_priv * priv,struct statistics_general_common * common,struct statistics_rx_non_phy * rx_non_phy,struct statistics_rx_phy * rx_ofdm,struct statistics_rx_ht_phy * rx_ofdm_ht,struct statistics_rx_phy * rx_cck,struct statistics_tx * tx,struct statistics_bt_activity * bt_activity)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
iwlagn_rx_statistics(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_reply_statistics(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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 */
iwlagn_rx_card_state_notif(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_missed_beacon_notif(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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. */
iwlagn_rx_reply_rx_phy(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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 */
iwlagn_set_decrypted_flag(struct iwl_priv * priv,struct ieee80211_hdr * hdr,u32 decrypt_res,struct ieee80211_rx_status * stats)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
iwlagn_pass_packet_to_mac80211(struct iwl_priv * priv,struct ieee80211_hdr * hdr,u16 len,u32 ampdu_status,struct iwl_rx_cmd_buffer * rxb,struct ieee80211_rx_status * stats)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
iwlagn_translate_rx_status(struct iwl_priv * priv,u32 decrypt_in)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 */
iwlagn_calc_rssi(struct iwl_priv * priv,struct iwl_rx_phy_res * rx_resp)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 */
iwlagn_rx_reply_rx(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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
iwlagn_rx_noa_notification(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)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 */
iwl_setup_rx_handlers(struct iwl_priv * priv)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
iwl_rx_dispatch(struct iwl_op_mode * op_mode,struct napi_struct * napi,struct iwl_rx_cmd_buffer * rxb)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 }
1022