1 /******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
10 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
11 * Copyright(c) 2018 - 2020 Intel Corporation
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of version 2 of the GNU General Public License as
15 * published by the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * The full GNU General Public License is included in this distribution
23 * in the file called COPYING.
24 *
25 * Contact Information:
26 * Intel Linux Wireless <linuxwifi@intel.com>
27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
28 *
29 * BSD LICENSE
30 *
31 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
32 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
33 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
34 * Copyright(c) 2018 - 2020 Intel Corporation
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 *
41 * * Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * * Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in
45 * the documentation and/or other materials provided with the
46 * distribution.
47 * * Neither the name Intel Corporation nor the names of its
48 * contributors may be used to endorse or promote products derived
49 * from this software without specific prior written permission.
50 *
51 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
52 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
53 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
54 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
55 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
56 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
57 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
61 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 *****************************************************************************/
63 #include <asm/unaligned.h>
64 #include <linux/etherdevice.h>
65 #include <linux/skbuff.h>
66 #include "iwl-trans.h"
67 #include "mvm.h"
68 #include "fw-api.h"
69
70 /*
71 * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
72 *
73 * Copies the phy information in mvm->last_phy_info, it will be used when the
74 * actual data will come from the fw in the next packet.
75 */
iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)76 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
77 {
78 struct iwl_rx_packet *pkt = rxb_addr(rxb);
79
80 memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
81 mvm->ampdu_ref++;
82
83 #ifdef CONFIG_IWLWIFI_DEBUGFS
84 if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
85 spin_lock(&mvm->drv_stats_lock);
86 mvm->drv_rx_stats.ampdu_count++;
87 spin_unlock(&mvm->drv_stats_lock);
88 }
89 #endif
90 }
91
92 /*
93 * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
94 *
95 * Adds the rxb to a new skb and give it to mac80211
96 */
iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct napi_struct * napi,struct sk_buff * skb,struct ieee80211_hdr * hdr,u16 len,u8 crypt_len,struct iwl_rx_cmd_buffer * rxb)97 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
98 struct ieee80211_sta *sta,
99 struct napi_struct *napi,
100 struct sk_buff *skb,
101 struct ieee80211_hdr *hdr, u16 len,
102 u8 crypt_len,
103 struct iwl_rx_cmd_buffer *rxb)
104 {
105 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
106 unsigned int fraglen;
107
108 /*
109 * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
110 * but those are all multiples of 4 long) all goes away, but we
111 * want the *end* of it, which is going to be the start of the IP
112 * header, to be aligned when it gets pulled in.
113 * The beginning of the skb->data is aligned on at least a 4-byte
114 * boundary after allocation. Everything here is aligned at least
115 * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
116 * the result.
117 */
118 skb_reserve(skb, hdrlen & 3);
119
120 /* If frame is small enough to fit in skb->head, pull it completely.
121 * If not, only pull ieee80211_hdr (including crypto if present, and
122 * an additional 8 bytes for SNAP/ethertype, see below) so that
123 * splice() or TCP coalesce are more efficient.
124 *
125 * Since, in addition, ieee80211_data_to_8023() always pull in at
126 * least 8 bytes (possibly more for mesh) we can do the same here
127 * to save the cost of doing it later. That still doesn't pull in
128 * the actual IP header since the typical case has a SNAP header.
129 * If the latter changes (there are efforts in the standards group
130 * to do so) we should revisit this and ieee80211_data_to_8023().
131 */
132 hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
133
134 skb_put_data(skb, hdr, hdrlen);
135 fraglen = len - hdrlen;
136
137 if (fraglen) {
138 int offset = (void *)hdr + hdrlen -
139 rxb_addr(rxb) + rxb_offset(rxb);
140
141 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
142 fraglen, rxb->truesize);
143 }
144
145 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
146 }
147
148 /*
149 * iwl_mvm_get_signal_strength - use new rx PHY INFO API
150 * values are reported by the fw as positive values - need to negate
151 * to obtain their dBM. Account for missing antennas by replacing 0
152 * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
153 */
iwl_mvm_get_signal_strength(struct iwl_mvm * mvm,struct iwl_rx_phy_info * phy_info,struct ieee80211_rx_status * rx_status)154 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
155 struct iwl_rx_phy_info *phy_info,
156 struct ieee80211_rx_status *rx_status)
157 {
158 int energy_a, energy_b, energy_c, max_energy;
159 u32 val;
160
161 val =
162 le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
163 energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
164 IWL_RX_INFO_ENERGY_ANT_A_POS;
165 energy_a = energy_a ? -energy_a : S8_MIN;
166 energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
167 IWL_RX_INFO_ENERGY_ANT_B_POS;
168 energy_b = energy_b ? -energy_b : S8_MIN;
169 energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
170 IWL_RX_INFO_ENERGY_ANT_C_POS;
171 energy_c = energy_c ? -energy_c : S8_MIN;
172 max_energy = max(energy_a, energy_b);
173 max_energy = max(max_energy, energy_c);
174
175 IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
176 energy_a, energy_b, energy_c, max_energy);
177
178 rx_status->signal = max_energy;
179 rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
180 RX_RES_PHY_FLAGS_ANTENNA)
181 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
182 rx_status->chain_signal[0] = energy_a;
183 rx_status->chain_signal[1] = energy_b;
184 rx_status->chain_signal[2] = energy_c;
185 }
186
187 /*
188 * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
189 * @mvm: the mvm object
190 * @hdr: 80211 header
191 * @stats: status in mac80211's format
192 * @rx_pkt_status: status coming from fw
193 *
194 * returns non 0 value if the packet should be dropped
195 */
iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm * mvm,struct ieee80211_hdr * hdr,struct ieee80211_rx_status * stats,u32 rx_pkt_status,u8 * crypt_len)196 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
197 struct ieee80211_hdr *hdr,
198 struct ieee80211_rx_status *stats,
199 u32 rx_pkt_status,
200 u8 *crypt_len)
201 {
202 if (!ieee80211_has_protected(hdr->frame_control) ||
203 (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
204 RX_MPDU_RES_STATUS_SEC_NO_ENC)
205 return 0;
206
207 /* packet was encrypted with unknown alg */
208 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
209 RX_MPDU_RES_STATUS_SEC_ENC_ERR)
210 return 0;
211
212 switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
213 case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
214 /* alg is CCM: check MIC only */
215 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
216 return -1;
217
218 stats->flag |= RX_FLAG_DECRYPTED;
219 *crypt_len = IEEE80211_CCMP_HDR_LEN;
220 return 0;
221
222 case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
223 /* Don't drop the frame and decrypt it in SW */
224 if (!fw_has_api(&mvm->fw->ucode_capa,
225 IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
226 !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
227 return 0;
228 *crypt_len = IEEE80211_TKIP_IV_LEN;
229 /* fall through */
230
231 case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
232 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
233 return -1;
234
235 stats->flag |= RX_FLAG_DECRYPTED;
236 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
237 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
238 *crypt_len = IEEE80211_WEP_IV_LEN;
239 return 0;
240
241 case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
242 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
243 return -1;
244 stats->flag |= RX_FLAG_DECRYPTED;
245 return 0;
246
247 default:
248 /* Expected in monitor (not having the keys) */
249 if (!mvm->monitor_on)
250 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
251 }
252
253 return 0;
254 }
255
iwl_mvm_rx_handle_tcm(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct ieee80211_hdr * hdr,u32 len,struct iwl_rx_phy_info * phy_info,u32 rate_n_flags)256 static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
257 struct ieee80211_sta *sta,
258 struct ieee80211_hdr *hdr, u32 len,
259 struct iwl_rx_phy_info *phy_info,
260 u32 rate_n_flags)
261 {
262 struct iwl_mvm_sta *mvmsta;
263 struct iwl_mvm_tcm_mac *mdata;
264 int mac;
265 int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
266 struct iwl_mvm_vif *mvmvif;
267 /* expected throughput in 100Kbps, single stream, 20 MHz */
268 static const u8 thresh_tpt[] = {
269 9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
270 };
271 u16 thr;
272
273 if (ieee80211_is_data_qos(hdr->frame_control))
274 ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
275
276 mvmsta = iwl_mvm_sta_from_mac80211(sta);
277 mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
278
279 if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
280 schedule_delayed_work(&mvm->tcm.work, 0);
281 mdata = &mvm->tcm.data[mac];
282 mdata->rx.pkts[ac]++;
283
284 /* count the airtime only once for each ampdu */
285 if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
286 mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
287 mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
288 }
289
290 if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
291 return;
292
293 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
294
295 if (mdata->opened_rx_ba_sessions ||
296 mdata->uapsd_nonagg_detect.detected ||
297 (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
298 !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
299 !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
300 !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
301 mvmsta->sta_id != mvmvif->ap_sta_id)
302 return;
303
304 if (rate_n_flags & RATE_MCS_HT_MSK) {
305 thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
306 thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
307 RATE_HT_MCS_NSS_POS);
308 } else {
309 if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
310 ARRAY_SIZE(thresh_tpt)))
311 return;
312 thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
313 thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
314 RATE_VHT_MCS_NSS_POS);
315 }
316
317 thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
318 RATE_MCS_CHAN_WIDTH_POS);
319
320 mdata->uapsd_nonagg_detect.rx_bytes += len;
321 ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
322 }
323
iwl_mvm_rx_csum(struct ieee80211_sta * sta,struct sk_buff * skb,u32 status)324 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
325 struct sk_buff *skb,
326 u32 status)
327 {
328 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
329 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
330
331 if (mvmvif->features & NETIF_F_RXCSUM &&
332 status & RX_MPDU_RES_STATUS_CSUM_DONE &&
333 status & RX_MPDU_RES_STATUS_CSUM_OK)
334 skb->ip_summed = CHECKSUM_UNNECESSARY;
335 }
336
337 /*
338 * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
339 *
340 * Handles the actual data of the Rx packet from the fw
341 */
iwl_mvm_rx_rx_mpdu(struct iwl_mvm * mvm,struct napi_struct * napi,struct iwl_rx_cmd_buffer * rxb)342 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
343 struct iwl_rx_cmd_buffer *rxb)
344 {
345 struct ieee80211_hdr *hdr;
346 struct ieee80211_rx_status *rx_status;
347 struct iwl_rx_packet *pkt = rxb_addr(rxb);
348 struct iwl_rx_phy_info *phy_info;
349 struct iwl_rx_mpdu_res_start *rx_res;
350 struct ieee80211_sta *sta = NULL;
351 struct sk_buff *skb;
352 u32 len;
353 u32 rate_n_flags;
354 u32 rx_pkt_status;
355 u8 crypt_len = 0;
356
357 phy_info = &mvm->last_phy_info;
358 rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
359 hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
360 len = le16_to_cpu(rx_res->byte_count);
361 rx_pkt_status = get_unaligned_le32((__le32 *)
362 (pkt->data + sizeof(*rx_res) + len));
363
364 /* Dont use dev_alloc_skb(), we'll have enough headroom once
365 * ieee80211_hdr pulled.
366 */
367 skb = alloc_skb(128, GFP_ATOMIC);
368 if (!skb) {
369 IWL_ERR(mvm, "alloc_skb failed\n");
370 return;
371 }
372
373 rx_status = IEEE80211_SKB_RXCB(skb);
374
375 /*
376 * drop the packet if it has failed being decrypted by HW
377 */
378 if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
379 &crypt_len)) {
380 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
381 rx_pkt_status);
382 kfree_skb(skb);
383 return;
384 }
385
386 /*
387 * Keep packets with CRC errors (and with overrun) for monitor mode
388 * (otherwise the firmware discards them) but mark them as bad.
389 */
390 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
391 !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
392 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
393 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
394 }
395
396 /* This will be used in several places later */
397 rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
398
399 /* rx_status carries information about the packet to mac80211 */
400 rx_status->mactime = le64_to_cpu(phy_info->timestamp);
401 rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
402 rx_status->band =
403 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
404 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
405 rx_status->freq =
406 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
407 rx_status->band);
408
409 /* TSF as indicated by the firmware is at INA time */
410 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
411
412 iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
413
414 IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
415 (unsigned long long)rx_status->mactime);
416
417 rcu_read_lock();
418 if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
419 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
420
421 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
422
423 if (!WARN_ON_ONCE(id >= mvm->fw->ucode_capa.num_stations)) {
424 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
425 if (IS_ERR(sta))
426 sta = NULL;
427 }
428 } else if (!is_multicast_ether_addr(hdr->addr2)) {
429 /* This is fine since we prevent two stations with the same
430 * address from being added.
431 */
432 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
433 }
434
435 if (sta) {
436 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
437 struct ieee80211_vif *tx_blocked_vif =
438 rcu_dereference(mvm->csa_tx_blocked_vif);
439 struct iwl_fw_dbg_trigger_tlv *trig;
440 struct ieee80211_vif *vif = mvmsta->vif;
441
442 /* We have tx blocked stations (with CS bit). If we heard
443 * frames from a blocked station on a new channel we can
444 * TX to it again.
445 */
446 if (unlikely(tx_blocked_vif) && vif == tx_blocked_vif) {
447 struct iwl_mvm_vif *mvmvif =
448 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
449
450 if (mvmvif->csa_target_freq == rx_status->freq)
451 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
452 false);
453 }
454
455 rs_update_last_rssi(mvm, mvmsta, rx_status);
456
457 trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
458 ieee80211_vif_to_wdev(vif),
459 FW_DBG_TRIGGER_RSSI);
460
461 if (trig && ieee80211_is_beacon(hdr->frame_control)) {
462 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
463 s32 rssi;
464
465 rssi_trig = (void *)trig->data;
466 rssi = le32_to_cpu(rssi_trig->rssi);
467
468 if (rx_status->signal < rssi)
469 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
470 NULL);
471 }
472
473 if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
474 !is_multicast_ether_addr(hdr->addr1) &&
475 ieee80211_is_data(hdr->frame_control))
476 iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
477 rate_n_flags);
478
479 if (ieee80211_is_data(hdr->frame_control))
480 iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
481 }
482 rcu_read_unlock();
483
484 /* set the preamble flag if appropriate */
485 if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
486 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
487
488 if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
489 /*
490 * We know which subframes of an A-MPDU belong
491 * together since we get a single PHY response
492 * from the firmware for all of them
493 */
494 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
495 rx_status->ampdu_reference = mvm->ampdu_ref;
496 }
497
498 /* Set up the HT phy flags */
499 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
500 case RATE_MCS_CHAN_WIDTH_20:
501 break;
502 case RATE_MCS_CHAN_WIDTH_40:
503 rx_status->bw = RATE_INFO_BW_40;
504 break;
505 case RATE_MCS_CHAN_WIDTH_80:
506 rx_status->bw = RATE_INFO_BW_80;
507 break;
508 case RATE_MCS_CHAN_WIDTH_160:
509 rx_status->bw = RATE_INFO_BW_160;
510 break;
511 }
512 if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
513 rate_n_flags & RATE_MCS_SGI_MSK)
514 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
515 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
516 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
517 if (rate_n_flags & RATE_MCS_LDPC_MSK)
518 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
519 if (rate_n_flags & RATE_MCS_HT_MSK) {
520 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
521 RATE_MCS_STBC_POS;
522 rx_status->encoding = RX_ENC_HT;
523 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
524 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
525 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
526 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
527 RATE_MCS_STBC_POS;
528 rx_status->nss =
529 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
530 RATE_VHT_MCS_NSS_POS) + 1;
531 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
532 rx_status->encoding = RX_ENC_VHT;
533 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
534 if (rate_n_flags & RATE_MCS_BF_MSK)
535 rx_status->enc_flags |= RX_ENC_FLAG_BF;
536 } else {
537 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
538 rx_status->band);
539
540 if (WARN(rate < 0 || rate > 0xFF,
541 "Invalid rate flags 0x%x, band %d,\n",
542 rate_n_flags, rx_status->band)) {
543 kfree_skb(skb);
544 return;
545 }
546 rx_status->rate_idx = rate;
547 }
548
549 #ifdef CONFIG_IWLWIFI_DEBUGFS
550 iwl_mvm_update_frame_stats(mvm, rate_n_flags,
551 rx_status->flag & RX_FLAG_AMPDU_DETAILS);
552 #endif
553
554 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
555 ieee80211_is_probe_resp(hdr->frame_control)) &&
556 mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
557 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
558
559 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
560 ieee80211_is_probe_resp(hdr->frame_control)))
561 rx_status->boottime_ns = ktime_get_boottime_ns();
562
563 iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
564 crypt_len, rxb);
565 }
566
567 struct iwl_mvm_stat_data {
568 struct iwl_mvm *mvm;
569 __le32 flags;
570 __le32 mac_id;
571 u8 beacon_filter_average_energy;
572 __le32 *beacon_counter;
573 u8 *beacon_average_energy;
574 };
575
iwl_mvm_stat_iterator(void * _data,u8 * mac,struct ieee80211_vif * vif)576 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
577 struct ieee80211_vif *vif)
578 {
579 struct iwl_mvm_stat_data *data = _data;
580 struct iwl_mvm *mvm = data->mvm;
581 int sig = -data->beacon_filter_average_energy;
582 int last_event;
583 int thold = vif->bss_conf.cqm_rssi_thold;
584 int hyst = vif->bss_conf.cqm_rssi_hyst;
585 u16 id = le32_to_cpu(data->mac_id);
586 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
587 u16 vif_id = mvmvif->id;
588
589 /* This doesn't need the MAC ID check since it's not taking the
590 * data copied into the "data" struct, but rather the data from
591 * the notification directly.
592 */
593 mvmvif->beacon_stats.num_beacons =
594 le32_to_cpu(data->beacon_counter[vif_id]);
595 mvmvif->beacon_stats.avg_signal =
596 -data->beacon_average_energy[vif_id];
597
598 /* make sure that beacon statistics don't go backwards with TCM
599 * request to clear statistics
600 */
601 if (le32_to_cpu(data->flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
602 mvmvif->beacon_stats.accu_num_beacons +=
603 mvmvif->beacon_stats.num_beacons;
604
605 if (mvmvif->id != id)
606 return;
607
608 if (vif->type != NL80211_IFTYPE_STATION)
609 return;
610
611 if (sig == 0) {
612 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
613 return;
614 }
615
616 mvmvif->bf_data.ave_beacon_signal = sig;
617
618 /* BT Coex */
619 if (mvmvif->bf_data.bt_coex_min_thold !=
620 mvmvif->bf_data.bt_coex_max_thold) {
621 last_event = mvmvif->bf_data.last_bt_coex_event;
622 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
623 (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
624 last_event == 0)) {
625 mvmvif->bf_data.last_bt_coex_event = sig;
626 IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
627 sig);
628 iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
629 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
630 (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
631 last_event == 0)) {
632 mvmvif->bf_data.last_bt_coex_event = sig;
633 IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
634 sig);
635 iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
636 }
637 }
638
639 if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
640 return;
641
642 /* CQM Notification */
643 last_event = mvmvif->bf_data.last_cqm_event;
644 if (thold && sig < thold && (last_event == 0 ||
645 sig < last_event - hyst)) {
646 mvmvif->bf_data.last_cqm_event = sig;
647 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
648 sig);
649 ieee80211_cqm_rssi_notify(
650 vif,
651 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
652 sig,
653 GFP_KERNEL);
654 } else if (sig > thold &&
655 (last_event == 0 || sig > last_event + hyst)) {
656 mvmvif->bf_data.last_cqm_event = sig;
657 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
658 sig);
659 ieee80211_cqm_rssi_notify(
660 vif,
661 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
662 sig,
663 GFP_KERNEL);
664 }
665 }
666
667 static inline void
iwl_mvm_rx_stats_check_trigger(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)668 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
669 {
670 struct iwl_fw_dbg_trigger_tlv *trig;
671 struct iwl_fw_dbg_trigger_stats *trig_stats;
672 u32 trig_offset, trig_thold;
673
674 trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL, FW_DBG_TRIGGER_STATS);
675 if (!trig)
676 return;
677
678 trig_stats = (void *)trig->data;
679
680 trig_offset = le32_to_cpu(trig_stats->stop_offset);
681 trig_thold = le32_to_cpu(trig_stats->stop_threshold);
682
683 if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
684 return;
685
686 if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
687 return;
688
689 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
690 }
691
iwl_mvm_update_avg_energy(struct iwl_mvm * mvm,u8 energy[IWL_MVM_STATION_COUNT_MAX])692 static void iwl_mvm_update_avg_energy(struct iwl_mvm *mvm,
693 u8 energy[IWL_MVM_STATION_COUNT_MAX])
694 {
695 int i;
696
697 if (WARN_ONCE(mvm->fw->ucode_capa.num_stations >
698 IWL_MVM_STATION_COUNT_MAX,
699 "Driver and FW station count mismatch %d\n",
700 mvm->fw->ucode_capa.num_stations))
701 return;
702
703 rcu_read_lock();
704 for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) {
705 struct iwl_mvm_sta *sta;
706
707 if (!energy[i])
708 continue;
709
710 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
711 if (!sta)
712 continue;
713 sta->avg_energy = energy[i];
714 }
715 rcu_read_unlock();
716 }
717
718 static void
iwl_mvm_update_tcm_from_stats(struct iwl_mvm * mvm,__le32 * air_time_le,__le32 * rx_bytes_le)719 iwl_mvm_update_tcm_from_stats(struct iwl_mvm *mvm, __le32 *air_time_le,
720 __le32 *rx_bytes_le)
721 {
722 int i;
723
724 spin_lock(&mvm->tcm.lock);
725 for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
726 struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
727 u32 rx_bytes = le32_to_cpu(rx_bytes_le[i]);
728 u32 airtime = le32_to_cpu(air_time_le[i]);
729
730 mdata->rx.airtime += airtime;
731 mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
732 if (airtime) {
733 /* re-init every time to store rate from FW */
734 ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
735 ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
736 rx_bytes * 8 / airtime);
737 }
738 }
739 spin_unlock(&mvm->tcm.lock);
740 }
741
742 static void
iwl_mvm_handle_rx_statistics_tlv(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)743 iwl_mvm_handle_rx_statistics_tlv(struct iwl_mvm *mvm,
744 struct iwl_rx_packet *pkt)
745 {
746 struct iwl_mvm_stat_data data = {
747 .mvm = mvm,
748 };
749 u8 beacon_average_energy[MAC_INDEX_AUX];
750 u8 average_energy[IWL_MVM_STATION_COUNT_MAX];
751 struct iwl_statistics_operational_ntfy *stats;
752 int expected_size;
753 __le32 flags;
754 int i;
755
756 expected_size = sizeof(*stats);
757 if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) < expected_size,
758 "received invalid statistics size (%d)!, expected_size: %d\n",
759 iwl_rx_packet_payload_len(pkt), expected_size))
760 return;
761
762 stats = (void *)&pkt->data;
763
764 if (WARN_ONCE(stats->hdr.type != FW_STATISTICS_OPERATIONAL ||
765 stats->hdr.version != 1,
766 "received unsupported hdr type %d, version %d\n",
767 stats->hdr.type, stats->hdr.version))
768 return;
769
770 flags = stats->flags;
771 mvm->radio_stats.rx_time = le64_to_cpu(stats->rx_time);
772 mvm->radio_stats.tx_time = le64_to_cpu(stats->tx_time);
773 mvm->radio_stats.on_time_rf = le64_to_cpu(stats->on_time_rf);
774 mvm->radio_stats.on_time_scan = le64_to_cpu(stats->on_time_scan);
775
776 iwl_mvm_rx_stats_check_trigger(mvm, pkt);
777
778 data.mac_id = stats->mac_id;
779 data.beacon_filter_average_energy =
780 le32_to_cpu(stats->beacon_filter_average_energy);
781 data.flags = flags;
782 data.beacon_counter = stats->beacon_counter;
783 for (i = 0; i < ARRAY_SIZE(beacon_average_energy); i++)
784 beacon_average_energy[i] =
785 le32_to_cpu(stats->beacon_average_energy[i]);
786
787 data.beacon_average_energy = beacon_average_energy;
788
789 ieee80211_iterate_active_interfaces(mvm->hw,
790 IEEE80211_IFACE_ITER_NORMAL,
791 iwl_mvm_stat_iterator,
792 &data);
793
794 for (i = 0; i < ARRAY_SIZE(average_energy); i++)
795 average_energy[i] = le32_to_cpu(stats->average_energy[i]);
796 iwl_mvm_update_avg_energy(mvm, average_energy);
797
798 /*
799 * Don't update in case the statistics are not cleared, since
800 * we will end up counting twice the same airtime, once in TCM
801 * request and once in statistics notification.
802 */
803 if (le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
804 iwl_mvm_update_tcm_from_stats(mvm, stats->air_time,
805 stats->rx_bytes);
806 }
807
iwl_mvm_handle_rx_statistics(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)808 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
809 struct iwl_rx_packet *pkt)
810 {
811 struct iwl_mvm_stat_data data = {
812 .mvm = mvm,
813 };
814 __le32 *bytes, *air_time, flags;
815 int expected_size;
816 u8 *energy;
817
818 /* From ver 14 and up we use TLV statistics format */
819 if (iwl_fw_lookup_notif_ver(mvm->fw, LONG_GROUP,
820 STATISTICS_CMD, 0) >= 14)
821 return iwl_mvm_handle_rx_statistics_tlv(mvm, pkt);
822
823 if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
824 if (iwl_mvm_has_new_rx_api(mvm))
825 expected_size = sizeof(struct iwl_notif_statistics_v11);
826 else
827 expected_size = sizeof(struct iwl_notif_statistics_v10);
828 } else {
829 expected_size = sizeof(struct iwl_notif_statistics);
830 }
831
832 if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
833 "received invalid statistics size (%d)!\n",
834 iwl_rx_packet_payload_len(pkt)))
835 return;
836
837 if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
838 struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
839
840 data.mac_id = stats->rx.general.mac_id;
841 data.beacon_filter_average_energy =
842 stats->general.common.beacon_filter_average_energy;
843
844 mvm->rx_stats_v3 = stats->rx;
845
846 mvm->radio_stats.rx_time =
847 le64_to_cpu(stats->general.common.rx_time);
848 mvm->radio_stats.tx_time =
849 le64_to_cpu(stats->general.common.tx_time);
850 mvm->radio_stats.on_time_rf =
851 le64_to_cpu(stats->general.common.on_time_rf);
852 mvm->radio_stats.on_time_scan =
853 le64_to_cpu(stats->general.common.on_time_scan);
854
855 data.beacon_counter = stats->general.beacon_counter;
856 data.beacon_average_energy =
857 stats->general.beacon_average_energy;
858 flags = stats->flag;
859 } else {
860 struct iwl_notif_statistics *stats = (void *)&pkt->data;
861
862 data.mac_id = stats->rx.general.mac_id;
863 data.beacon_filter_average_energy =
864 stats->general.common.beacon_filter_average_energy;
865
866 mvm->rx_stats = stats->rx;
867
868 mvm->radio_stats.rx_time =
869 le64_to_cpu(stats->general.common.rx_time);
870 mvm->radio_stats.tx_time =
871 le64_to_cpu(stats->general.common.tx_time);
872 mvm->radio_stats.on_time_rf =
873 le64_to_cpu(stats->general.common.on_time_rf);
874 mvm->radio_stats.on_time_scan =
875 le64_to_cpu(stats->general.common.on_time_scan);
876
877 data.beacon_counter = stats->general.beacon_counter;
878 data.beacon_average_energy =
879 stats->general.beacon_average_energy;
880 flags = stats->flag;
881 }
882 data.flags = flags;
883
884 iwl_mvm_rx_stats_check_trigger(mvm, pkt);
885
886 ieee80211_iterate_active_interfaces(mvm->hw,
887 IEEE80211_IFACE_ITER_NORMAL,
888 iwl_mvm_stat_iterator,
889 &data);
890
891 if (!iwl_mvm_has_new_rx_api(mvm))
892 return;
893
894 if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
895 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
896
897 energy = (void *)&v11->load_stats.avg_energy;
898 bytes = (void *)&v11->load_stats.byte_count;
899 air_time = (void *)&v11->load_stats.air_time;
900 } else {
901 struct iwl_notif_statistics *stats = (void *)&pkt->data;
902
903 energy = (void *)&stats->load_stats.avg_energy;
904 bytes = (void *)&stats->load_stats.byte_count;
905 air_time = (void *)&stats->load_stats.air_time;
906 }
907
908 iwl_mvm_update_avg_energy(mvm, energy);
909
910 /*
911 * Don't update in case the statistics are not cleared, since
912 * we will end up counting twice the same airtime, once in TCM
913 * request and once in statistics notification.
914 */
915 if (le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
916 iwl_mvm_update_tcm_from_stats(mvm, air_time, bytes);
917
918 }
919
iwl_mvm_rx_statistics(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)920 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
921 {
922 iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
923 }
924
iwl_mvm_window_status_notif(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)925 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
926 struct iwl_rx_cmd_buffer *rxb)
927 {
928 struct iwl_rx_packet *pkt = rxb_addr(rxb);
929 struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
930 int i;
931 u32 pkt_len = iwl_rx_packet_payload_len(pkt);
932
933 if (WARN_ONCE(pkt_len != sizeof(*notif),
934 "Received window status notification of wrong size (%u)\n",
935 pkt_len))
936 return;
937
938 rcu_read_lock();
939 for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
940 struct ieee80211_sta *sta;
941 u8 sta_id, tid;
942 u64 bitmap;
943 u32 ssn;
944 u16 ratid;
945 u16 received_mpdu;
946
947 ratid = le16_to_cpu(notif->ra_tid[i]);
948 /* check that this TID is valid */
949 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
950 continue;
951
952 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
953 if (received_mpdu == 0)
954 continue;
955
956 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
957 /* get the station */
958 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
959 >> BA_WINDOW_STATUS_STA_ID_POS;
960 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
961 if (IS_ERR_OR_NULL(sta))
962 continue;
963 bitmap = le64_to_cpu(notif->bitmap[i]);
964 ssn = le32_to_cpu(notif->start_seq_num[i]);
965
966 /* update mac80211 with the bitmap for the reordering buffer */
967 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
968 received_mpdu);
969 }
970 rcu_read_unlock();
971 }
972