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 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 
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(sizeof(*new_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 						iwl_cmd_id(pkt->hdr.cmd,
1019 							   0, 0)),
1020 			     pkt->hdr.cmd);
1021 	}
1022 }
1023