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 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of version 2 of the GNU General Public License as
14 * published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
24 * USA
25 *
26 * The full GNU General Public License is included in this distribution
27 * in the file called COPYING.
28 *
29 * Contact Information:
30 * Intel Linux Wireless <linuxwifi@intel.com>
31 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
32 *
33 * BSD LICENSE
34 *
35 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
36 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
37 * All rights reserved.
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 *
43 * * Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * * Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in
47 * the documentation and/or other materials provided with the
48 * distribution.
49 * * Neither the name Intel Corporation nor the names of its
50 * contributors may be used to endorse or promote products derived
51 * from this software without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
54 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
55 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
56 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
57 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
58 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
59 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
60 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
61 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
62 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
63 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
64 *****************************************************************************/
65 #include <asm/unaligned.h>
66 #include <linux/etherdevice.h>
67 #include <linux/skbuff.h>
68 #include "iwl-trans.h"
69 #include "mvm.h"
70 #include "fw-api.h"
71
72 /*
73 * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
74 *
75 * Copies the phy information in mvm->last_phy_info, it will be used when the
76 * actual data will come from the fw in the next packet.
77 */
iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)78 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
79 {
80 struct iwl_rx_packet *pkt = rxb_addr(rxb);
81
82 memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
83 mvm->ampdu_ref++;
84
85 #ifdef CONFIG_IWLWIFI_DEBUGFS
86 if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
87 spin_lock(&mvm->drv_stats_lock);
88 mvm->drv_rx_stats.ampdu_count++;
89 spin_unlock(&mvm->drv_stats_lock);
90 }
91 #endif
92 }
93
94 /*
95 * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
96 *
97 * Adds the rxb to a new skb and give it to mac80211
98 */
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)99 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
100 struct ieee80211_sta *sta,
101 struct napi_struct *napi,
102 struct sk_buff *skb,
103 struct ieee80211_hdr *hdr, u16 len,
104 u8 crypt_len,
105 struct iwl_rx_cmd_buffer *rxb)
106 {
107 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
108 unsigned int fraglen;
109
110 /*
111 * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
112 * but those are all multiples of 4 long) all goes away, but we
113 * want the *end* of it, which is going to be the start of the IP
114 * header, to be aligned when it gets pulled in.
115 * The beginning of the skb->data is aligned on at least a 4-byte
116 * boundary after allocation. Everything here is aligned at least
117 * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
118 * the result.
119 */
120 skb_reserve(skb, hdrlen & 3);
121
122 /* If frame is small enough to fit in skb->head, pull it completely.
123 * If not, only pull ieee80211_hdr (including crypto if present, and
124 * an additional 8 bytes for SNAP/ethertype, see below) so that
125 * splice() or TCP coalesce are more efficient.
126 *
127 * Since, in addition, ieee80211_data_to_8023() always pull in at
128 * least 8 bytes (possibly more for mesh) we can do the same here
129 * to save the cost of doing it later. That still doesn't pull in
130 * the actual IP header since the typical case has a SNAP header.
131 * If the latter changes (there are efforts in the standards group
132 * to do so) we should revisit this and ieee80211_data_to_8023().
133 */
134 hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
135
136 skb_put_data(skb, hdr, hdrlen);
137 fraglen = len - hdrlen;
138
139 if (fraglen) {
140 int offset = (void *)hdr + hdrlen -
141 rxb_addr(rxb) + rxb_offset(rxb);
142
143 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
144 fraglen, rxb->truesize);
145 }
146
147 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
148 }
149
150 /*
151 * iwl_mvm_get_signal_strength - use new rx PHY INFO API
152 * values are reported by the fw as positive values - need to negate
153 * to obtain their dBM. Account for missing antennas by replacing 0
154 * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
155 */
iwl_mvm_get_signal_strength(struct iwl_mvm * mvm,struct iwl_rx_phy_info * phy_info,struct ieee80211_rx_status * rx_status)156 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
157 struct iwl_rx_phy_info *phy_info,
158 struct ieee80211_rx_status *rx_status)
159 {
160 int energy_a, energy_b, energy_c, max_energy;
161 u32 val;
162
163 val =
164 le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
165 energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
166 IWL_RX_INFO_ENERGY_ANT_A_POS;
167 energy_a = energy_a ? -energy_a : S8_MIN;
168 energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
169 IWL_RX_INFO_ENERGY_ANT_B_POS;
170 energy_b = energy_b ? -energy_b : S8_MIN;
171 energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
172 IWL_RX_INFO_ENERGY_ANT_C_POS;
173 energy_c = energy_c ? -energy_c : S8_MIN;
174 max_energy = max(energy_a, energy_b);
175 max_energy = max(max_energy, energy_c);
176
177 IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
178 energy_a, energy_b, energy_c, max_energy);
179
180 rx_status->signal = max_energy;
181 rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
182 RX_RES_PHY_FLAGS_ANTENNA)
183 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
184 rx_status->chain_signal[0] = energy_a;
185 rx_status->chain_signal[1] = energy_b;
186 rx_status->chain_signal[2] = energy_c;
187 }
188
189 /*
190 * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
191 * @mvm: the mvm object
192 * @hdr: 80211 header
193 * @stats: status in mac80211's format
194 * @rx_pkt_status: status coming from fw
195 *
196 * returns non 0 value if the packet should be dropped
197 */
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)198 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
199 struct ieee80211_hdr *hdr,
200 struct ieee80211_rx_status *stats,
201 u32 rx_pkt_status,
202 u8 *crypt_len)
203 {
204 if (!ieee80211_has_protected(hdr->frame_control) ||
205 (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
206 RX_MPDU_RES_STATUS_SEC_NO_ENC)
207 return 0;
208
209 /* packet was encrypted with unknown alg */
210 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
211 RX_MPDU_RES_STATUS_SEC_ENC_ERR)
212 return 0;
213
214 switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
215 case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
216 /* alg is CCM: check MIC only */
217 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
218 return -1;
219
220 stats->flag |= RX_FLAG_DECRYPTED;
221 *crypt_len = IEEE80211_CCMP_HDR_LEN;
222 return 0;
223
224 case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
225 /* Don't drop the frame and decrypt it in SW */
226 if (!fw_has_api(&mvm->fw->ucode_capa,
227 IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
228 !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
229 return 0;
230 *crypt_len = IEEE80211_TKIP_IV_LEN;
231 /* fall through if TTAK OK */
232
233 case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
234 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
235 return -1;
236
237 stats->flag |= RX_FLAG_DECRYPTED;
238 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
239 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
240 *crypt_len = IEEE80211_WEP_IV_LEN;
241 return 0;
242
243 case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
244 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
245 return -1;
246 stats->flag |= RX_FLAG_DECRYPTED;
247 return 0;
248
249 default:
250 /* Expected in monitor (not having the keys) */
251 if (!mvm->monitor_on)
252 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
253 }
254
255 return 0;
256 }
257
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)258 static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
259 struct ieee80211_sta *sta,
260 struct ieee80211_hdr *hdr, u32 len,
261 struct iwl_rx_phy_info *phy_info,
262 u32 rate_n_flags)
263 {
264 struct iwl_mvm_sta *mvmsta;
265 struct iwl_mvm_tcm_mac *mdata;
266 int mac;
267 int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
268 struct iwl_mvm_vif *mvmvif;
269 /* expected throughput in 100Kbps, single stream, 20 MHz */
270 static const u8 thresh_tpt[] = {
271 9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
272 };
273 u16 thr;
274
275 if (ieee80211_is_data_qos(hdr->frame_control))
276 ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
277
278 mvmsta = iwl_mvm_sta_from_mac80211(sta);
279 mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
280
281 if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
282 schedule_delayed_work(&mvm->tcm.work, 0);
283 mdata = &mvm->tcm.data[mac];
284 mdata->rx.pkts[ac]++;
285
286 /* count the airtime only once for each ampdu */
287 if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
288 mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
289 mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
290 }
291
292 if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
293 return;
294
295 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
296
297 if (mdata->opened_rx_ba_sessions ||
298 mdata->uapsd_nonagg_detect.detected ||
299 (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
300 !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
301 !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
302 !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
303 mvmsta->sta_id != mvmvif->ap_sta_id)
304 return;
305
306 if (rate_n_flags & RATE_MCS_HT_MSK) {
307 thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
308 thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
309 RATE_HT_MCS_NSS_POS);
310 } else {
311 if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
312 ARRAY_SIZE(thresh_tpt)))
313 return;
314 thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
315 thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
316 RATE_VHT_MCS_NSS_POS);
317 }
318
319 thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
320 RATE_MCS_CHAN_WIDTH_POS);
321
322 mdata->uapsd_nonagg_detect.rx_bytes += len;
323 ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
324 }
325
iwl_mvm_rx_csum(struct ieee80211_sta * sta,struct sk_buff * skb,u32 status)326 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
327 struct sk_buff *skb,
328 u32 status)
329 {
330 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
331 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
332
333 if (mvmvif->features & NETIF_F_RXCSUM &&
334 status & RX_MPDU_RES_STATUS_CSUM_DONE &&
335 status & RX_MPDU_RES_STATUS_CSUM_OK)
336 skb->ip_summed = CHECKSUM_UNNECESSARY;
337 }
338
339 /*
340 * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
341 *
342 * Handles the actual data of the Rx packet from the fw
343 */
iwl_mvm_rx_rx_mpdu(struct iwl_mvm * mvm,struct napi_struct * napi,struct iwl_rx_cmd_buffer * rxb)344 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
345 struct iwl_rx_cmd_buffer *rxb)
346 {
347 struct ieee80211_hdr *hdr;
348 struct ieee80211_rx_status *rx_status;
349 struct iwl_rx_packet *pkt = rxb_addr(rxb);
350 struct iwl_rx_phy_info *phy_info;
351 struct iwl_rx_mpdu_res_start *rx_res;
352 struct ieee80211_sta *sta = NULL;
353 struct sk_buff *skb;
354 u32 len;
355 u32 rate_n_flags;
356 u32 rx_pkt_status;
357 u8 crypt_len = 0;
358 bool take_ref;
359
360 phy_info = &mvm->last_phy_info;
361 rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
362 hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
363 len = le16_to_cpu(rx_res->byte_count);
364 rx_pkt_status = get_unaligned_le32((__le32 *)
365 (pkt->data + sizeof(*rx_res) + len));
366
367 /* Dont use dev_alloc_skb(), we'll have enough headroom once
368 * ieee80211_hdr pulled.
369 */
370 skb = alloc_skb(128, GFP_ATOMIC);
371 if (!skb) {
372 IWL_ERR(mvm, "alloc_skb failed\n");
373 return;
374 }
375
376 rx_status = IEEE80211_SKB_RXCB(skb);
377
378 /*
379 * drop the packet if it has failed being decrypted by HW
380 */
381 if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
382 &crypt_len)) {
383 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
384 rx_pkt_status);
385 kfree_skb(skb);
386 return;
387 }
388
389 /*
390 * Keep packets with CRC errors (and with overrun) for monitor mode
391 * (otherwise the firmware discards them) but mark them as bad.
392 */
393 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
394 !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
395 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
396 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
397 }
398
399 /* This will be used in several places later */
400 rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
401
402 /* rx_status carries information about the packet to mac80211 */
403 rx_status->mactime = le64_to_cpu(phy_info->timestamp);
404 rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
405 rx_status->band =
406 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
407 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
408 rx_status->freq =
409 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
410 rx_status->band);
411
412 /* TSF as indicated by the firmware is at INA time */
413 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
414
415 iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
416
417 IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
418 (unsigned long long)rx_status->mactime);
419
420 rcu_read_lock();
421 if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
422 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
423
424 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
425
426 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
427 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
428 if (IS_ERR(sta))
429 sta = NULL;
430 }
431 } else if (!is_multicast_ether_addr(hdr->addr2)) {
432 /* This is fine since we prevent two stations with the same
433 * address from being added.
434 */
435 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
436 }
437
438 if (sta) {
439 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
440 struct ieee80211_vif *tx_blocked_vif =
441 rcu_dereference(mvm->csa_tx_blocked_vif);
442
443 /* We have tx blocked stations (with CS bit). If we heard
444 * frames from a blocked station on a new channel we can
445 * TX to it again.
446 */
447 if (unlikely(tx_blocked_vif) &&
448 mvmsta->vif == tx_blocked_vif) {
449 struct iwl_mvm_vif *mvmvif =
450 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
451
452 if (mvmvif->csa_target_freq == rx_status->freq)
453 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
454 false);
455 }
456
457 rs_update_last_rssi(mvm, mvmsta, rx_status);
458
459 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
460 ieee80211_is_beacon(hdr->frame_control)) {
461 struct iwl_fw_dbg_trigger_tlv *trig;
462 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
463 bool trig_check;
464 s32 rssi;
465
466 trig = iwl_fw_dbg_get_trigger(mvm->fw,
467 FW_DBG_TRIGGER_RSSI);
468 rssi_trig = (void *)trig->data;
469 rssi = le32_to_cpu(rssi_trig->rssi);
470
471 trig_check =
472 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
473 ieee80211_vif_to_wdev(mvmsta->vif),
474 trig);
475 if (trig_check && rx_status->signal < rssi)
476 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
477 NULL);
478 }
479
480 if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
481 !is_multicast_ether_addr(hdr->addr1) &&
482 ieee80211_is_data(hdr->frame_control))
483 iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
484 rate_n_flags);
485
486 if (ieee80211_is_data(hdr->frame_control))
487 iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
488 }
489 rcu_read_unlock();
490
491 /* set the preamble flag if appropriate */
492 if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
493 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
494
495 if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
496 /*
497 * We know which subframes of an A-MPDU belong
498 * together since we get a single PHY response
499 * from the firmware for all of them
500 */
501 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
502 rx_status->ampdu_reference = mvm->ampdu_ref;
503 }
504
505 /* Set up the HT phy flags */
506 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
507 case RATE_MCS_CHAN_WIDTH_20:
508 break;
509 case RATE_MCS_CHAN_WIDTH_40:
510 rx_status->bw = RATE_INFO_BW_40;
511 break;
512 case RATE_MCS_CHAN_WIDTH_80:
513 rx_status->bw = RATE_INFO_BW_80;
514 break;
515 case RATE_MCS_CHAN_WIDTH_160:
516 rx_status->bw = RATE_INFO_BW_160;
517 break;
518 }
519 if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
520 rate_n_flags & RATE_MCS_SGI_MSK)
521 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
522 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
523 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
524 if (rate_n_flags & RATE_MCS_LDPC_MSK)
525 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
526 if (rate_n_flags & RATE_MCS_HT_MSK) {
527 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
528 RATE_MCS_STBC_POS;
529 rx_status->encoding = RX_ENC_HT;
530 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
531 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
532 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
533 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
534 RATE_MCS_STBC_POS;
535 rx_status->nss =
536 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
537 RATE_VHT_MCS_NSS_POS) + 1;
538 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
539 rx_status->encoding = RX_ENC_VHT;
540 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
541 if (rate_n_flags & RATE_MCS_BF_MSK)
542 rx_status->enc_flags |= RX_ENC_FLAG_BF;
543 } else {
544 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
545 rx_status->band);
546
547 if (WARN(rate < 0 || rate > 0xFF,
548 "Invalid rate flags 0x%x, band %d,\n",
549 rate_n_flags, rx_status->band)) {
550 kfree_skb(skb);
551 return;
552 }
553 rx_status->rate_idx = rate;
554 }
555
556 #ifdef CONFIG_IWLWIFI_DEBUGFS
557 iwl_mvm_update_frame_stats(mvm, rate_n_flags,
558 rx_status->flag & RX_FLAG_AMPDU_DETAILS);
559 #endif
560
561 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
562 ieee80211_is_probe_resp(hdr->frame_control)) &&
563 mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
564 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
565
566 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
567 ieee80211_is_probe_resp(hdr->frame_control)))
568 rx_status->boottime_ns = ktime_get_boot_ns();
569
570 /* Take a reference briefly to kick off a d0i3 entry delay so
571 * we can handle bursts of RX packets without toggling the
572 * state too often. But don't do this for beacons if we are
573 * going to idle because the beacon filtering changes we make
574 * cause the firmware to send us collateral beacons. */
575 take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
576 ieee80211_is_beacon(hdr->frame_control));
577
578 if (take_ref)
579 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
580
581 iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
582 crypt_len, rxb);
583
584 if (take_ref)
585 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
586 }
587
588 struct iwl_mvm_stat_data {
589 struct iwl_mvm *mvm;
590 __le32 flags;
591 __le32 mac_id;
592 u8 beacon_filter_average_energy;
593 void *general;
594 };
595
iwl_mvm_stat_iterator(void * _data,u8 * mac,struct ieee80211_vif * vif)596 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
597 struct ieee80211_vif *vif)
598 {
599 struct iwl_mvm_stat_data *data = _data;
600 struct iwl_mvm *mvm = data->mvm;
601 int sig = -data->beacon_filter_average_energy;
602 int last_event;
603 int thold = vif->bss_conf.cqm_rssi_thold;
604 int hyst = vif->bss_conf.cqm_rssi_hyst;
605 u16 id = le32_to_cpu(data->mac_id);
606 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
607
608 /* This doesn't need the MAC ID check since it's not taking the
609 * data copied into the "data" struct, but rather the data from
610 * the notification directly.
611 */
612 if (data->general) {
613 u16 vif_id = mvmvif->id;
614
615 if (iwl_mvm_is_cdb_supported(mvm)) {
616 struct mvm_statistics_general_cdb *general =
617 data->general;
618
619 mvmvif->beacon_stats.num_beacons =
620 le32_to_cpu(general->beacon_counter[vif_id]);
621 mvmvif->beacon_stats.avg_signal =
622 -general->beacon_average_energy[vif_id];
623 } else {
624 struct mvm_statistics_general_v8 *general =
625 data->general;
626
627 mvmvif->beacon_stats.num_beacons =
628 le32_to_cpu(general->beacon_counter[vif_id]);
629 mvmvif->beacon_stats.avg_signal =
630 -general->beacon_average_energy[vif_id];
631 }
632 }
633
634 /* make sure that beacon statistics don't go backwards with TCM
635 * request to clear statistics
636 */
637 if (le32_to_cpu(data->flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
638 mvmvif->beacon_stats.accu_num_beacons +=
639 mvmvif->beacon_stats.num_beacons;
640
641 if (mvmvif->id != id)
642 return;
643
644 if (vif->type != NL80211_IFTYPE_STATION)
645 return;
646
647 if (sig == 0) {
648 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
649 return;
650 }
651
652 mvmvif->bf_data.ave_beacon_signal = sig;
653
654 /* BT Coex */
655 if (mvmvif->bf_data.bt_coex_min_thold !=
656 mvmvif->bf_data.bt_coex_max_thold) {
657 last_event = mvmvif->bf_data.last_bt_coex_event;
658 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
659 (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
660 last_event == 0)) {
661 mvmvif->bf_data.last_bt_coex_event = sig;
662 IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
663 sig);
664 iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
665 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
666 (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
667 last_event == 0)) {
668 mvmvif->bf_data.last_bt_coex_event = sig;
669 IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
670 sig);
671 iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
672 }
673 }
674
675 if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
676 return;
677
678 /* CQM Notification */
679 last_event = mvmvif->bf_data.last_cqm_event;
680 if (thold && sig < thold && (last_event == 0 ||
681 sig < last_event - hyst)) {
682 mvmvif->bf_data.last_cqm_event = sig;
683 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
684 sig);
685 ieee80211_cqm_rssi_notify(
686 vif,
687 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
688 sig,
689 GFP_KERNEL);
690 } else if (sig > thold &&
691 (last_event == 0 || sig > last_event + hyst)) {
692 mvmvif->bf_data.last_cqm_event = sig;
693 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
694 sig);
695 ieee80211_cqm_rssi_notify(
696 vif,
697 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
698 sig,
699 GFP_KERNEL);
700 }
701 }
702
703 static inline void
iwl_mvm_rx_stats_check_trigger(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)704 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
705 {
706 struct iwl_fw_dbg_trigger_tlv *trig;
707 struct iwl_fw_dbg_trigger_stats *trig_stats;
708 u32 trig_offset, trig_thold;
709
710 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
711 return;
712
713 trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
714 trig_stats = (void *)trig->data;
715
716 if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, NULL, trig))
717 return;
718
719 trig_offset = le32_to_cpu(trig_stats->stop_offset);
720 trig_thold = le32_to_cpu(trig_stats->stop_threshold);
721
722 if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
723 return;
724
725 if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
726 return;
727
728 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
729 }
730
iwl_mvm_handle_rx_statistics(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)731 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
732 struct iwl_rx_packet *pkt)
733 {
734 struct iwl_mvm_stat_data data = {
735 .mvm = mvm,
736 };
737 int expected_size;
738 int i;
739 u8 *energy;
740 __le32 *bytes;
741 __le32 *air_time;
742 __le32 flags;
743
744 if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
745 if (iwl_mvm_has_new_rx_api(mvm))
746 expected_size = sizeof(struct iwl_notif_statistics_v11);
747 else
748 expected_size = sizeof(struct iwl_notif_statistics_v10);
749 } else {
750 expected_size = sizeof(struct iwl_notif_statistics_cdb);
751 }
752
753 if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
754 "received invalid statistics size (%d)!\n",
755 iwl_rx_packet_payload_len(pkt)))
756 return;
757
758 if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
759 struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
760
761 data.mac_id = stats->rx.general.mac_id;
762 data.beacon_filter_average_energy =
763 stats->general.common.beacon_filter_average_energy;
764
765 mvm->rx_stats_v3 = stats->rx;
766
767 mvm->radio_stats.rx_time =
768 le64_to_cpu(stats->general.common.rx_time);
769 mvm->radio_stats.tx_time =
770 le64_to_cpu(stats->general.common.tx_time);
771 mvm->radio_stats.on_time_rf =
772 le64_to_cpu(stats->general.common.on_time_rf);
773 mvm->radio_stats.on_time_scan =
774 le64_to_cpu(stats->general.common.on_time_scan);
775
776 data.general = &stats->general;
777
778 flags = stats->flag;
779 } else {
780 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
781
782 data.mac_id = stats->rx.general.mac_id;
783 data.beacon_filter_average_energy =
784 stats->general.common.beacon_filter_average_energy;
785
786 mvm->rx_stats = stats->rx;
787
788 mvm->radio_stats.rx_time =
789 le64_to_cpu(stats->general.common.rx_time);
790 mvm->radio_stats.tx_time =
791 le64_to_cpu(stats->general.common.tx_time);
792 mvm->radio_stats.on_time_rf =
793 le64_to_cpu(stats->general.common.on_time_rf);
794 mvm->radio_stats.on_time_scan =
795 le64_to_cpu(stats->general.common.on_time_scan);
796
797 data.general = &stats->general;
798
799 flags = stats->flag;
800 }
801 data.flags = flags;
802
803 iwl_mvm_rx_stats_check_trigger(mvm, pkt);
804
805 ieee80211_iterate_active_interfaces(mvm->hw,
806 IEEE80211_IFACE_ITER_NORMAL,
807 iwl_mvm_stat_iterator,
808 &data);
809
810 if (!iwl_mvm_has_new_rx_api(mvm))
811 return;
812
813 if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
814 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
815
816 energy = (void *)&v11->load_stats.avg_energy;
817 bytes = (void *)&v11->load_stats.byte_count;
818 air_time = (void *)&v11->load_stats.air_time;
819 } else {
820 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
821
822 energy = (void *)&stats->load_stats.avg_energy;
823 bytes = (void *)&stats->load_stats.byte_count;
824 air_time = (void *)&stats->load_stats.air_time;
825 }
826
827 rcu_read_lock();
828 for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
829 struct iwl_mvm_sta *sta;
830
831 if (!energy[i])
832 continue;
833
834 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
835 if (!sta)
836 continue;
837 sta->avg_energy = energy[i];
838 }
839 rcu_read_unlock();
840
841 /*
842 * Don't update in case the statistics are not cleared, since
843 * we will end up counting twice the same airtime, once in TCM
844 * request and once in statistics notification.
845 */
846 if (!(le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR))
847 return;
848
849 spin_lock(&mvm->tcm.lock);
850 for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
851 struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
852 u32 airtime = le32_to_cpu(air_time[i]);
853 u32 rx_bytes = le32_to_cpu(bytes[i]);
854
855 mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
856 if (airtime) {
857 /* re-init every time to store rate from FW */
858 ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
859 ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
860 rx_bytes * 8 / airtime);
861 }
862
863 mdata->rx.airtime += airtime;
864 }
865 spin_unlock(&mvm->tcm.lock);
866 }
867
iwl_mvm_rx_statistics(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)868 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
869 {
870 iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
871 }
872
iwl_mvm_window_status_notif(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)873 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
874 struct iwl_rx_cmd_buffer *rxb)
875 {
876 struct iwl_rx_packet *pkt = rxb_addr(rxb);
877 struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
878 int i;
879 u32 pkt_len = iwl_rx_packet_payload_len(pkt);
880
881 if (WARN_ONCE(pkt_len != sizeof(*notif),
882 "Received window status notification of wrong size (%u)\n",
883 pkt_len))
884 return;
885
886 rcu_read_lock();
887 for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
888 struct ieee80211_sta *sta;
889 u8 sta_id, tid;
890 u64 bitmap;
891 u32 ssn;
892 u16 ratid;
893 u16 received_mpdu;
894
895 ratid = le16_to_cpu(notif->ra_tid[i]);
896 /* check that this TID is valid */
897 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
898 continue;
899
900 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
901 if (received_mpdu == 0)
902 continue;
903
904 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
905 /* get the station */
906 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
907 >> BA_WINDOW_STATUS_STA_ID_POS;
908 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
909 if (IS_ERR_OR_NULL(sta))
910 continue;
911 bitmap = le64_to_cpu(notif->bitmap[i]);
912 ssn = le32_to_cpu(notif->start_seq_num[i]);
913
914 /* update mac80211 with the bitmap for the reordering buffer */
915 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
916 received_mpdu);
917 }
918 rcu_read_unlock();
919 }
920