1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2012-2014, 2018-2020 Intel Corporation
4  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
5  * Copyright (C) 2016-2017 Intel Deutschland GmbH
6  */
7 #include <asm/unaligned.h>
8 #include <linux/etherdevice.h>
9 #include <linux/skbuff.h>
10 #include "iwl-trans.h"
11 #include "mvm.h"
12 #include "fw-api.h"
13 
14 /*
15  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
16  *
17  * Copies the phy information in mvm->last_phy_info, it will be used when the
18  * actual data will come from the fw in the next packet.
19  */
20 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
21 {
22 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
23 	unsigned int pkt_len = iwl_rx_packet_payload_len(pkt);
24 
25 	if (unlikely(pkt_len < sizeof(mvm->last_phy_info)))
26 		return;
27 
28 	memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
29 	mvm->ampdu_ref++;
30 
31 #ifdef CONFIG_IWLWIFI_DEBUGFS
32 	if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
33 		spin_lock(&mvm->drv_stats_lock);
34 		mvm->drv_rx_stats.ampdu_count++;
35 		spin_unlock(&mvm->drv_stats_lock);
36 	}
37 #endif
38 }
39 
40 /*
41  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
42  *
43  * Adds the rxb to a new skb and give it to mac80211
44  */
45 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
46 					    struct ieee80211_sta *sta,
47 					    struct napi_struct *napi,
48 					    struct sk_buff *skb,
49 					    struct ieee80211_hdr *hdr, u16 len,
50 					    u8 crypt_len,
51 					    struct iwl_rx_cmd_buffer *rxb)
52 {
53 	unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
54 	unsigned int fraglen;
55 
56 	/*
57 	 * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
58 	 * but those are all multiples of 4 long) all goes away, but we
59 	 * want the *end* of it, which is going to be the start of the IP
60 	 * header, to be aligned when it gets pulled in.
61 	 * The beginning of the skb->data is aligned on at least a 4-byte
62 	 * boundary after allocation. Everything here is aligned at least
63 	 * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
64 	 * the result.
65 	 */
66 	skb_reserve(skb, hdrlen & 3);
67 
68 	/* If frame is small enough to fit in skb->head, pull it completely.
69 	 * If not, only pull ieee80211_hdr (including crypto if present, and
70 	 * an additional 8 bytes for SNAP/ethertype, see below) so that
71 	 * splice() or TCP coalesce are more efficient.
72 	 *
73 	 * Since, in addition, ieee80211_data_to_8023() always pull in at
74 	 * least 8 bytes (possibly more for mesh) we can do the same here
75 	 * to save the cost of doing it later. That still doesn't pull in
76 	 * the actual IP header since the typical case has a SNAP header.
77 	 * If the latter changes (there are efforts in the standards group
78 	 * to do so) we should revisit this and ieee80211_data_to_8023().
79 	 */
80 	hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
81 
82 	skb_put_data(skb, hdr, hdrlen);
83 	fraglen = len - hdrlen;
84 
85 	if (fraglen) {
86 		int offset = (void *)hdr + hdrlen -
87 			     rxb_addr(rxb) + rxb_offset(rxb);
88 
89 		skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
90 				fraglen, rxb->truesize);
91 	}
92 
93 	ieee80211_rx_napi(mvm->hw, sta, skb, napi);
94 }
95 
96 /*
97  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
98  * values are reported by the fw as positive values - need to negate
99  * to obtain their dBM.  Account for missing antennas by replacing 0
100  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
101  */
102 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
103 					struct iwl_rx_phy_info *phy_info,
104 					struct ieee80211_rx_status *rx_status)
105 {
106 	int energy_a, energy_b, energy_c, max_energy;
107 	u32 val;
108 
109 	val =
110 	    le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
111 	energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
112 						IWL_RX_INFO_ENERGY_ANT_A_POS;
113 	energy_a = energy_a ? -energy_a : S8_MIN;
114 	energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
115 						IWL_RX_INFO_ENERGY_ANT_B_POS;
116 	energy_b = energy_b ? -energy_b : S8_MIN;
117 	energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
118 						IWL_RX_INFO_ENERGY_ANT_C_POS;
119 	energy_c = energy_c ? -energy_c : S8_MIN;
120 	max_energy = max(energy_a, energy_b);
121 	max_energy = max(max_energy, energy_c);
122 
123 	IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
124 			energy_a, energy_b, energy_c, max_energy);
125 
126 	rx_status->signal = max_energy;
127 	rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
128 				RX_RES_PHY_FLAGS_ANTENNA)
129 					>> RX_RES_PHY_FLAGS_ANTENNA_POS;
130 	rx_status->chain_signal[0] = energy_a;
131 	rx_status->chain_signal[1] = energy_b;
132 	rx_status->chain_signal[2] = energy_c;
133 }
134 
135 /*
136  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
137  * @mvm: the mvm object
138  * @hdr: 80211 header
139  * @stats: status in mac80211's format
140  * @rx_pkt_status: status coming from fw
141  *
142  * returns non 0 value if the packet should be dropped
143  */
144 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
145 					struct ieee80211_hdr *hdr,
146 					struct ieee80211_rx_status *stats,
147 					u32 rx_pkt_status,
148 					u8 *crypt_len)
149 {
150 	if (!ieee80211_has_protected(hdr->frame_control) ||
151 	    (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
152 			     RX_MPDU_RES_STATUS_SEC_NO_ENC)
153 		return 0;
154 
155 	/* packet was encrypted with unknown alg */
156 	if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
157 					RX_MPDU_RES_STATUS_SEC_ENC_ERR)
158 		return 0;
159 
160 	switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
161 	case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
162 		/* alg is CCM: check MIC only */
163 		if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
164 			return -1;
165 
166 		stats->flag |= RX_FLAG_DECRYPTED;
167 		*crypt_len = IEEE80211_CCMP_HDR_LEN;
168 		return 0;
169 
170 	case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
171 		/* Don't drop the frame and decrypt it in SW */
172 		if (!fw_has_api(&mvm->fw->ucode_capa,
173 				IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
174 		    !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
175 			return 0;
176 		*crypt_len = IEEE80211_TKIP_IV_LEN;
177 		fallthrough;
178 
179 	case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
180 		if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
181 			return -1;
182 
183 		stats->flag |= RX_FLAG_DECRYPTED;
184 		if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
185 				RX_MPDU_RES_STATUS_SEC_WEP_ENC)
186 			*crypt_len = IEEE80211_WEP_IV_LEN;
187 		return 0;
188 
189 	case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
190 		if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
191 			return -1;
192 		stats->flag |= RX_FLAG_DECRYPTED;
193 		return 0;
194 
195 	default:
196 		/* Expected in monitor (not having the keys) */
197 		if (!mvm->monitor_on)
198 			IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
199 	}
200 
201 	return 0;
202 }
203 
204 static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
205 				  struct ieee80211_sta *sta,
206 				  struct ieee80211_hdr *hdr, u32 len,
207 				  struct iwl_rx_phy_info *phy_info,
208 				  u32 rate_n_flags)
209 {
210 	struct iwl_mvm_sta *mvmsta;
211 	struct iwl_mvm_tcm_mac *mdata;
212 	int mac;
213 	int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
214 	struct iwl_mvm_vif *mvmvif;
215 	/* expected throughput in 100Kbps, single stream, 20 MHz */
216 	static const u8 thresh_tpt[] = {
217 		9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
218 	};
219 	u16 thr;
220 
221 	if (ieee80211_is_data_qos(hdr->frame_control))
222 		ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
223 
224 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
225 	mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
226 
227 	if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
228 		schedule_delayed_work(&mvm->tcm.work, 0);
229 	mdata = &mvm->tcm.data[mac];
230 	mdata->rx.pkts[ac]++;
231 
232 	/* count the airtime only once for each ampdu */
233 	if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
234 		mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
235 		mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
236 	}
237 
238 	if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
239 		return;
240 
241 	mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
242 
243 	if (mdata->opened_rx_ba_sessions ||
244 	    mdata->uapsd_nonagg_detect.detected ||
245 	    (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
246 	     !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
247 	     !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
248 	     !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
249 	    mvmsta->sta_id != mvmvif->ap_sta_id)
250 		return;
251 
252 	if (rate_n_flags & RATE_MCS_HT_MSK) {
253 		thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
254 		thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
255 					RATE_HT_MCS_NSS_POS);
256 	} else {
257 		if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
258 				ARRAY_SIZE(thresh_tpt)))
259 			return;
260 		thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
261 		thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
262 					RATE_VHT_MCS_NSS_POS);
263 	}
264 
265 	thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
266 				RATE_MCS_CHAN_WIDTH_POS);
267 
268 	mdata->uapsd_nonagg_detect.rx_bytes += len;
269 	ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
270 }
271 
272 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
273 			    struct sk_buff *skb,
274 			    u32 status)
275 {
276 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
277 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
278 
279 	if (mvmvif->features & NETIF_F_RXCSUM &&
280 	    status & RX_MPDU_RES_STATUS_CSUM_DONE &&
281 	    status & RX_MPDU_RES_STATUS_CSUM_OK)
282 		skb->ip_summed = CHECKSUM_UNNECESSARY;
283 }
284 
285 /*
286  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
287  *
288  * Handles the actual data of the Rx packet from the fw
289  */
290 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
291 			struct iwl_rx_cmd_buffer *rxb)
292 {
293 	struct ieee80211_hdr *hdr;
294 	struct ieee80211_rx_status *rx_status;
295 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
296 	struct iwl_rx_phy_info *phy_info;
297 	struct iwl_rx_mpdu_res_start *rx_res;
298 	struct ieee80211_sta *sta = NULL;
299 	struct sk_buff *skb;
300 	u32 len, pkt_len = iwl_rx_packet_payload_len(pkt);
301 	u32 rate_n_flags;
302 	u32 rx_pkt_status;
303 	u8 crypt_len = 0;
304 
305 	if (unlikely(pkt_len < sizeof(*rx_res))) {
306 		IWL_DEBUG_DROP(mvm, "Bad REPLY_RX_MPDU_CMD size\n");
307 		return;
308 	}
309 
310 	phy_info = &mvm->last_phy_info;
311 	rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
312 	hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
313 	len = le16_to_cpu(rx_res->byte_count);
314 
315 	if (unlikely(len + sizeof(*rx_res) + sizeof(__le32) > pkt_len)) {
316 		IWL_DEBUG_DROP(mvm, "FW lied about packet len\n");
317 		return;
318 	}
319 
320 	rx_pkt_status = get_unaligned_le32((__le32 *)
321 		(pkt->data + sizeof(*rx_res) + len));
322 
323 	/* Dont use dev_alloc_skb(), we'll have enough headroom once
324 	 * ieee80211_hdr pulled.
325 	 */
326 	skb = alloc_skb(128, GFP_ATOMIC);
327 	if (!skb) {
328 		IWL_ERR(mvm, "alloc_skb failed\n");
329 		return;
330 	}
331 
332 	rx_status = IEEE80211_SKB_RXCB(skb);
333 
334 	/*
335 	 * drop the packet if it has failed being decrypted by HW
336 	 */
337 	if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
338 					 &crypt_len)) {
339 		IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
340 			       rx_pkt_status);
341 		kfree_skb(skb);
342 		return;
343 	}
344 
345 	/*
346 	 * Keep packets with CRC errors (and with overrun) for monitor mode
347 	 * (otherwise the firmware discards them) but mark them as bad.
348 	 */
349 	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
350 	    !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
351 		IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
352 		rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
353 	}
354 
355 	/* This will be used in several places later */
356 	rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
357 
358 	/* rx_status carries information about the packet to mac80211 */
359 	rx_status->mactime = le64_to_cpu(phy_info->timestamp);
360 	rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
361 	rx_status->band =
362 		(phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
363 				NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
364 	rx_status->freq =
365 		ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
366 					       rx_status->band);
367 
368 	/* TSF as indicated by the firmware  is at INA time */
369 	rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
370 
371 	iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
372 
373 	IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
374 			      (unsigned long long)rx_status->mactime);
375 
376 	rcu_read_lock();
377 	if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
378 		u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
379 
380 		id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
381 
382 		if (!WARN_ON_ONCE(id >= mvm->fw->ucode_capa.num_stations)) {
383 			sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
384 			if (IS_ERR(sta))
385 				sta = NULL;
386 		}
387 	} else if (!is_multicast_ether_addr(hdr->addr2)) {
388 		/* This is fine since we prevent two stations with the same
389 		 * address from being added.
390 		 */
391 		sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
392 	}
393 
394 	if (sta) {
395 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
396 		struct ieee80211_vif *tx_blocked_vif =
397 			rcu_dereference(mvm->csa_tx_blocked_vif);
398 		struct iwl_fw_dbg_trigger_tlv *trig;
399 		struct ieee80211_vif *vif = mvmsta->vif;
400 
401 		/* We have tx blocked stations (with CS bit). If we heard
402 		 * frames from a blocked station on a new channel we can
403 		 * TX to it again.
404 		 */
405 		if (unlikely(tx_blocked_vif) && vif == tx_blocked_vif) {
406 			struct iwl_mvm_vif *mvmvif =
407 				iwl_mvm_vif_from_mac80211(tx_blocked_vif);
408 
409 			if (mvmvif->csa_target_freq == rx_status->freq)
410 				iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
411 								 false);
412 		}
413 
414 		rs_update_last_rssi(mvm, mvmsta, rx_status);
415 
416 		trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
417 					     ieee80211_vif_to_wdev(vif),
418 					     FW_DBG_TRIGGER_RSSI);
419 
420 		if (trig && ieee80211_is_beacon(hdr->frame_control)) {
421 			struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
422 			s32 rssi;
423 
424 			rssi_trig = (void *)trig->data;
425 			rssi = le32_to_cpu(rssi_trig->rssi);
426 
427 			if (rx_status->signal < rssi)
428 				iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
429 							NULL);
430 		}
431 
432 		if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
433 		    !is_multicast_ether_addr(hdr->addr1) &&
434 		    ieee80211_is_data(hdr->frame_control))
435 			iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
436 					      rate_n_flags);
437 
438 		if (ieee80211_is_data(hdr->frame_control))
439 			iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
440 	}
441 	rcu_read_unlock();
442 
443 	/* set the preamble flag if appropriate */
444 	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
445 		rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
446 
447 	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
448 		/*
449 		 * We know which subframes of an A-MPDU belong
450 		 * together since we get a single PHY response
451 		 * from the firmware for all of them
452 		 */
453 		rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
454 		rx_status->ampdu_reference = mvm->ampdu_ref;
455 	}
456 
457 	/* Set up the HT phy flags */
458 	switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
459 	case RATE_MCS_CHAN_WIDTH_20:
460 		break;
461 	case RATE_MCS_CHAN_WIDTH_40:
462 		rx_status->bw = RATE_INFO_BW_40;
463 		break;
464 	case RATE_MCS_CHAN_WIDTH_80:
465 		rx_status->bw = RATE_INFO_BW_80;
466 		break;
467 	case RATE_MCS_CHAN_WIDTH_160:
468 		rx_status->bw = RATE_INFO_BW_160;
469 		break;
470 	}
471 	if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
472 	    rate_n_flags & RATE_MCS_SGI_MSK)
473 		rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
474 	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
475 		rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
476 	if (rate_n_flags & RATE_MCS_LDPC_MSK)
477 		rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
478 	if (rate_n_flags & RATE_MCS_HT_MSK) {
479 		u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
480 				RATE_MCS_STBC_POS;
481 		rx_status->encoding = RX_ENC_HT;
482 		rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
483 		rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
484 	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
485 		u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
486 				RATE_MCS_STBC_POS;
487 		rx_status->nss =
488 			((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
489 						RATE_VHT_MCS_NSS_POS) + 1;
490 		rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
491 		rx_status->encoding = RX_ENC_VHT;
492 		rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
493 		if (rate_n_flags & RATE_MCS_BF_MSK)
494 			rx_status->enc_flags |= RX_ENC_FLAG_BF;
495 	} else {
496 		int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
497 							       rx_status->band);
498 
499 		if (WARN(rate < 0 || rate > 0xFF,
500 			 "Invalid rate flags 0x%x, band %d,\n",
501 			 rate_n_flags, rx_status->band)) {
502 			kfree_skb(skb);
503 			return;
504 		}
505 		rx_status->rate_idx = rate;
506 	}
507 
508 #ifdef CONFIG_IWLWIFI_DEBUGFS
509 	iwl_mvm_update_frame_stats(mvm, rate_n_flags,
510 				   rx_status->flag & RX_FLAG_AMPDU_DETAILS);
511 #endif
512 
513 	if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
514 		      ieee80211_is_probe_resp(hdr->frame_control)) &&
515 		     mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
516 		mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
517 
518 	if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
519 		     ieee80211_is_probe_resp(hdr->frame_control)))
520 		rx_status->boottime_ns = ktime_get_boottime_ns();
521 
522 	iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
523 					crypt_len, rxb);
524 }
525 
526 struct iwl_mvm_stat_data {
527 	struct iwl_mvm *mvm;
528 	__le32 flags;
529 	__le32 mac_id;
530 	u8 beacon_filter_average_energy;
531 	__le32 *beacon_counter;
532 	u8 *beacon_average_energy;
533 };
534 
535 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
536 				  struct ieee80211_vif *vif)
537 {
538 	struct iwl_mvm_stat_data *data = _data;
539 	struct iwl_mvm *mvm = data->mvm;
540 	int sig = -data->beacon_filter_average_energy;
541 	int last_event;
542 	int thold = vif->bss_conf.cqm_rssi_thold;
543 	int hyst = vif->bss_conf.cqm_rssi_hyst;
544 	u16 id = le32_to_cpu(data->mac_id);
545 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
546 	u16 vif_id = mvmvif->id;
547 
548 	/* This doesn't need the MAC ID check since it's not taking the
549 	 * data copied into the "data" struct, but rather the data from
550 	 * the notification directly.
551 	 */
552 	mvmvif->beacon_stats.num_beacons =
553 		le32_to_cpu(data->beacon_counter[vif_id]);
554 	mvmvif->beacon_stats.avg_signal =
555 		-data->beacon_average_energy[vif_id];
556 
557 	/* make sure that beacon statistics don't go backwards with TCM
558 	 * request to clear statistics
559 	 */
560 	if (le32_to_cpu(data->flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
561 		mvmvif->beacon_stats.accu_num_beacons +=
562 			mvmvif->beacon_stats.num_beacons;
563 
564 	if (mvmvif->id != id)
565 		return;
566 
567 	if (vif->type != NL80211_IFTYPE_STATION)
568 		return;
569 
570 	if (sig == 0) {
571 		IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
572 		return;
573 	}
574 
575 	mvmvif->bf_data.ave_beacon_signal = sig;
576 
577 	/* BT Coex */
578 	if (mvmvif->bf_data.bt_coex_min_thold !=
579 	    mvmvif->bf_data.bt_coex_max_thold) {
580 		last_event = mvmvif->bf_data.last_bt_coex_event;
581 		if (sig > mvmvif->bf_data.bt_coex_max_thold &&
582 		    (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
583 		     last_event == 0)) {
584 			mvmvif->bf_data.last_bt_coex_event = sig;
585 			IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
586 				     sig);
587 			iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
588 		} else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
589 			   (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
590 			    last_event == 0)) {
591 			mvmvif->bf_data.last_bt_coex_event = sig;
592 			IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
593 				     sig);
594 			iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
595 		}
596 	}
597 
598 	if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
599 		return;
600 
601 	/* CQM Notification */
602 	last_event = mvmvif->bf_data.last_cqm_event;
603 	if (thold && sig < thold && (last_event == 0 ||
604 				     sig < last_event - hyst)) {
605 		mvmvif->bf_data.last_cqm_event = sig;
606 		IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
607 			     sig);
608 		ieee80211_cqm_rssi_notify(
609 			vif,
610 			NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
611 			sig,
612 			GFP_KERNEL);
613 	} else if (sig > thold &&
614 		   (last_event == 0 || sig > last_event + hyst)) {
615 		mvmvif->bf_data.last_cqm_event = sig;
616 		IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
617 			     sig);
618 		ieee80211_cqm_rssi_notify(
619 			vif,
620 			NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
621 			sig,
622 			GFP_KERNEL);
623 	}
624 }
625 
626 static inline void
627 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
628 {
629 	struct iwl_fw_dbg_trigger_tlv *trig;
630 	struct iwl_fw_dbg_trigger_stats *trig_stats;
631 	u32 trig_offset, trig_thold;
632 
633 	trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL, FW_DBG_TRIGGER_STATS);
634 	if (!trig)
635 		return;
636 
637 	trig_stats = (void *)trig->data;
638 
639 	trig_offset = le32_to_cpu(trig_stats->stop_offset);
640 	trig_thold = le32_to_cpu(trig_stats->stop_threshold);
641 
642 	if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
643 		return;
644 
645 	if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
646 		return;
647 
648 	iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
649 }
650 
651 static void iwl_mvm_stats_energy_iter(void *_data,
652 				      struct ieee80211_sta *sta)
653 {
654 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
655 	u8 *energy = _data;
656 	u32 sta_id = mvmsta->sta_id;
657 
658 	if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT_MAX, "sta_id %d >= %d",
659 		      sta_id, IWL_MVM_STATION_COUNT_MAX))
660 		return;
661 
662 	if (energy[sta_id])
663 		mvmsta->avg_energy = energy[sta_id];
664 
665 }
666 
667 static void
668 iwl_mvm_update_tcm_from_stats(struct iwl_mvm *mvm, __le32 *air_time_le,
669 			      __le32 *rx_bytes_le)
670 {
671 	int i;
672 
673 	spin_lock(&mvm->tcm.lock);
674 	for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
675 		struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
676 		u32 rx_bytes = le32_to_cpu(rx_bytes_le[i]);
677 		u32 airtime = le32_to_cpu(air_time_le[i]);
678 
679 		mdata->rx.airtime += airtime;
680 		mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
681 		if (airtime) {
682 			/* re-init every time to store rate from FW */
683 			ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
684 			ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
685 				      rx_bytes * 8 / airtime);
686 		}
687 	}
688 	spin_unlock(&mvm->tcm.lock);
689 }
690 
691 static void
692 iwl_mvm_handle_rx_statistics_tlv(struct iwl_mvm *mvm,
693 				 struct iwl_rx_packet *pkt)
694 {
695 	struct iwl_mvm_stat_data data = {
696 		.mvm = mvm,
697 	};
698 	u8 beacon_average_energy[MAC_INDEX_AUX];
699 	u8 average_energy[IWL_MVM_STATION_COUNT_MAX];
700 	struct iwl_statistics_operational_ntfy *stats;
701 	int expected_size;
702 	__le32 flags;
703 	int i;
704 
705 	expected_size = sizeof(*stats);
706 	if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) < expected_size,
707 		      "received invalid statistics size (%d)!, expected_size: %d\n",
708 		      iwl_rx_packet_payload_len(pkt), expected_size))
709 		return;
710 
711 	stats = (void *)&pkt->data;
712 
713 	if (WARN_ONCE(stats->hdr.type != FW_STATISTICS_OPERATIONAL ||
714 		      stats->hdr.version !=
715 		      iwl_fw_lookup_notif_ver(mvm->fw, LONG_GROUP, STATISTICS_CMD, 0),
716 		      "received unsupported hdr type %d, version %d\n",
717 		      stats->hdr.type, stats->hdr.version))
718 		return;
719 
720 	flags = stats->flags;
721 	mvm->radio_stats.rx_time = le64_to_cpu(stats->rx_time);
722 	mvm->radio_stats.tx_time = le64_to_cpu(stats->tx_time);
723 	mvm->radio_stats.on_time_rf = le64_to_cpu(stats->on_time_rf);
724 	mvm->radio_stats.on_time_scan = le64_to_cpu(stats->on_time_scan);
725 
726 	iwl_mvm_rx_stats_check_trigger(mvm, pkt);
727 
728 	data.mac_id = stats->mac_id;
729 	data.beacon_filter_average_energy =
730 		le32_to_cpu(stats->beacon_filter_average_energy);
731 	data.flags = flags;
732 	data.beacon_counter = stats->beacon_counter;
733 	for (i = 0; i < ARRAY_SIZE(beacon_average_energy); i++)
734 		beacon_average_energy[i] =
735 			le32_to_cpu(stats->beacon_average_energy[i]);
736 
737 	data.beacon_average_energy = beacon_average_energy;
738 
739 	ieee80211_iterate_active_interfaces(mvm->hw,
740 					    IEEE80211_IFACE_ITER_NORMAL,
741 					    iwl_mvm_stat_iterator,
742 					    &data);
743 
744 	for (i = 0; i < ARRAY_SIZE(average_energy); i++)
745 		average_energy[i] = le32_to_cpu(stats->average_energy[i]);
746 	ieee80211_iterate_stations_atomic(mvm->hw, iwl_mvm_stats_energy_iter,
747 					  average_energy);
748 	/*
749 	 * Don't update in case the statistics are not cleared, since
750 	 * we will end up counting twice the same airtime, once in TCM
751 	 * request and once in statistics notification.
752 	 */
753 	if (le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
754 		iwl_mvm_update_tcm_from_stats(mvm, stats->air_time,
755 					      stats->rx_bytes);
756 }
757 
758 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
759 				  struct iwl_rx_packet *pkt)
760 {
761 	struct iwl_mvm_stat_data data = {
762 		.mvm = mvm,
763 	};
764 	__le32 *bytes, *air_time, flags;
765 	int expected_size;
766 	u8 *energy;
767 
768 	/* From ver 14 and up we use TLV statistics format */
769 	if (iwl_fw_lookup_notif_ver(mvm->fw, LONG_GROUP,
770 				    STATISTICS_CMD, 0) >= 14)
771 		return iwl_mvm_handle_rx_statistics_tlv(mvm, pkt);
772 
773 	if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
774 		if (iwl_mvm_has_new_rx_api(mvm))
775 			expected_size = sizeof(struct iwl_notif_statistics_v11);
776 		else
777 			expected_size = sizeof(struct iwl_notif_statistics_v10);
778 	} else {
779 		expected_size = sizeof(struct iwl_notif_statistics);
780 	}
781 
782 	if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
783 		      "received invalid statistics size (%d)!\n",
784 		      iwl_rx_packet_payload_len(pkt)))
785 		return;
786 
787 	if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
788 		struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
789 
790 		data.mac_id = stats->rx.general.mac_id;
791 		data.beacon_filter_average_energy =
792 			stats->general.common.beacon_filter_average_energy;
793 
794 		mvm->rx_stats_v3 = stats->rx;
795 
796 		mvm->radio_stats.rx_time =
797 			le64_to_cpu(stats->general.common.rx_time);
798 		mvm->radio_stats.tx_time =
799 			le64_to_cpu(stats->general.common.tx_time);
800 		mvm->radio_stats.on_time_rf =
801 			le64_to_cpu(stats->general.common.on_time_rf);
802 		mvm->radio_stats.on_time_scan =
803 			le64_to_cpu(stats->general.common.on_time_scan);
804 
805 		data.beacon_counter = stats->general.beacon_counter;
806 		data.beacon_average_energy =
807 			stats->general.beacon_average_energy;
808 		flags = stats->flag;
809 	} else {
810 		struct iwl_notif_statistics *stats = (void *)&pkt->data;
811 
812 		data.mac_id = stats->rx.general.mac_id;
813 		data.beacon_filter_average_energy =
814 			stats->general.common.beacon_filter_average_energy;
815 
816 		mvm->rx_stats = stats->rx;
817 
818 		mvm->radio_stats.rx_time =
819 			le64_to_cpu(stats->general.common.rx_time);
820 		mvm->radio_stats.tx_time =
821 			le64_to_cpu(stats->general.common.tx_time);
822 		mvm->radio_stats.on_time_rf =
823 			le64_to_cpu(stats->general.common.on_time_rf);
824 		mvm->radio_stats.on_time_scan =
825 			le64_to_cpu(stats->general.common.on_time_scan);
826 
827 		data.beacon_counter = stats->general.beacon_counter;
828 		data.beacon_average_energy =
829 			stats->general.beacon_average_energy;
830 		flags = stats->flag;
831 	}
832 	data.flags = flags;
833 
834 	iwl_mvm_rx_stats_check_trigger(mvm, pkt);
835 
836 	ieee80211_iterate_active_interfaces(mvm->hw,
837 					    IEEE80211_IFACE_ITER_NORMAL,
838 					    iwl_mvm_stat_iterator,
839 					    &data);
840 
841 	if (!iwl_mvm_has_new_rx_api(mvm))
842 		return;
843 
844 	if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
845 		struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
846 
847 		energy = (void *)&v11->load_stats.avg_energy;
848 		bytes = (void *)&v11->load_stats.byte_count;
849 		air_time = (void *)&v11->load_stats.air_time;
850 	} else {
851 		struct iwl_notif_statistics *stats = (void *)&pkt->data;
852 
853 		energy = (void *)&stats->load_stats.avg_energy;
854 		bytes = (void *)&stats->load_stats.byte_count;
855 		air_time = (void *)&stats->load_stats.air_time;
856 	}
857 	ieee80211_iterate_stations_atomic(mvm->hw, iwl_mvm_stats_energy_iter,
858 					  energy);
859 
860 	/*
861 	 * Don't update in case the statistics are not cleared, since
862 	 * we will end up counting twice the same airtime, once in TCM
863 	 * request and once in statistics notification.
864 	 */
865 	if (le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
866 		iwl_mvm_update_tcm_from_stats(mvm, air_time, bytes);
867 
868 }
869 
870 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
871 {
872 	iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
873 }
874 
875 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
876 				 struct iwl_rx_cmd_buffer *rxb)
877 {
878 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
879 	struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
880 	int i;
881 
882 	BUILD_BUG_ON(ARRAY_SIZE(notif->ra_tid) != BA_WINDOW_STREAMS_MAX);
883 	BUILD_BUG_ON(ARRAY_SIZE(notif->mpdu_rx_count) != BA_WINDOW_STREAMS_MAX);
884 	BUILD_BUG_ON(ARRAY_SIZE(notif->bitmap) != BA_WINDOW_STREAMS_MAX);
885 	BUILD_BUG_ON(ARRAY_SIZE(notif->start_seq_num) != BA_WINDOW_STREAMS_MAX);
886 
887 	rcu_read_lock();
888 	for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
889 		struct ieee80211_sta *sta;
890 		u8 sta_id, tid;
891 		u64 bitmap;
892 		u32 ssn;
893 		u16 ratid;
894 		u16 received_mpdu;
895 
896 		ratid = le16_to_cpu(notif->ra_tid[i]);
897 		/* check that this TID is valid */
898 		if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
899 			continue;
900 
901 		received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
902 		if (received_mpdu == 0)
903 			continue;
904 
905 		tid = ratid & BA_WINDOW_STATUS_TID_MSK;
906 		/* get the station */
907 		sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
908 			 >> BA_WINDOW_STATUS_STA_ID_POS;
909 		sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
910 		if (IS_ERR_OR_NULL(sta))
911 			continue;
912 		bitmap = le64_to_cpu(notif->bitmap[i]);
913 		ssn = le32_to_cpu(notif->start_seq_num[i]);
914 
915 		/* update mac80211 with the bitmap for the reordering buffer */
916 		ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
917 						     received_mpdu);
918 	}
919 	rcu_read_unlock();
920 }
921