1 /******************************************************************************
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.
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
25 * The full GNU General Public License is included in this distribution
26 * in the file called COPYING.
28 * Contact Information:
29 * Intel Linux Wireless <ilw@linux.intel.com>
30 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
34 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
35 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
36 * All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
42 * * Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * * Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in
46 * the documentation and/or other materials provided with the
48 * * Neither the name Intel Corporation nor the names of its
49 * contributors may be used to endorse or promote products derived
50 * from this software without specific prior written permission.
52 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
53 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
54 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
55 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
56 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
57 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
58 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
59 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
60 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
61 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
62 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
63 *****************************************************************************/
64 #include "iwl-trans.h"
69 * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
71 * Copies the phy information in mvm->last_phy_info, it will be used when the
72 * actual data will come from the fw in the next packet.
74 int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
75 struct iwl_device_cmd *cmd)
77 struct iwl_rx_packet *pkt = rxb_addr(rxb);
79 memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
82 #ifdef CONFIG_IWLWIFI_DEBUGFS
83 if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
84 spin_lock(&mvm->drv_stats_lock);
85 mvm->drv_rx_stats.ampdu_count++;
86 spin_unlock(&mvm->drv_stats_lock);
94 * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
96 * Adds the rxb to a new skb and give it to mac80211
98 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
100 struct ieee80211_hdr *hdr, u16 len,
101 u32 ampdu_status, u8 crypt_len,
102 struct iwl_rx_cmd_buffer *rxb)
104 unsigned int hdrlen, fraglen;
106 /* If frame is small enough to fit in skb->head, pull it completely.
107 * If not, only pull ieee80211_hdr (including crypto if present, and
108 * an additional 8 bytes for SNAP/ethertype, see below) so that
109 * splice() or TCP coalesce are more efficient.
111 * Since, in addition, ieee80211_data_to_8023() always pull in at
112 * least 8 bytes (possibly more for mesh) we can do the same here
113 * to save the cost of doing it later. That still doesn't pull in
114 * the actual IP header since the typical case has a SNAP header.
115 * If the latter changes (there are efforts in the standards group
116 * to do so) we should revisit this and ieee80211_data_to_8023().
118 hdrlen = (len <= skb_tailroom(skb)) ? len :
119 sizeof(*hdr) + crypt_len + 8;
121 memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
122 fraglen = len - hdrlen;
125 int offset = (void *)hdr + hdrlen -
126 rxb_addr(rxb) + rxb_offset(rxb);
128 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
129 fraglen, rxb->truesize);
132 ieee80211_rx(mvm->hw, skb);
136 * iwl_mvm_get_signal_strength - use new rx PHY INFO API
137 * values are reported by the fw as positive values - need to negate
138 * to obtain their dBM. Account for missing antennas by replacing 0
139 * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
141 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
142 struct iwl_rx_phy_info *phy_info,
143 struct ieee80211_rx_status *rx_status)
145 int energy_a, energy_b, energy_c, max_energy;
149 le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
150 energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
151 IWL_RX_INFO_ENERGY_ANT_A_POS;
152 energy_a = energy_a ? -energy_a : S8_MIN;
153 energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
154 IWL_RX_INFO_ENERGY_ANT_B_POS;
155 energy_b = energy_b ? -energy_b : S8_MIN;
156 energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
157 IWL_RX_INFO_ENERGY_ANT_C_POS;
158 energy_c = energy_c ? -energy_c : S8_MIN;
159 max_energy = max(energy_a, energy_b);
160 max_energy = max(max_energy, energy_c);
162 IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
163 energy_a, energy_b, energy_c, max_energy);
165 rx_status->signal = max_energy;
166 rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
167 RX_RES_PHY_FLAGS_ANTENNA)
168 >> RX_RES_PHY_FLAGS_ANTENNA_POS;
169 rx_status->chain_signal[0] = energy_a;
170 rx_status->chain_signal[1] = energy_b;
171 rx_status->chain_signal[2] = energy_c;
175 * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
176 * @mvm: the mvm object
178 * @stats: status in mac80211's format
179 * @rx_pkt_status: status coming from fw
181 * returns non 0 value if the packet should be dropped
183 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
184 struct ieee80211_hdr *hdr,
185 struct ieee80211_rx_status *stats,
189 if (!ieee80211_has_protected(hdr->frame_control) ||
190 (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
191 RX_MPDU_RES_STATUS_SEC_NO_ENC)
194 /* packet was encrypted with unknown alg */
195 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
196 RX_MPDU_RES_STATUS_SEC_ENC_ERR)
199 switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
200 case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
201 /* alg is CCM: check MIC only */
202 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
205 stats->flag |= RX_FLAG_DECRYPTED;
206 IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
207 *crypt_len = IEEE80211_CCMP_HDR_LEN;
210 case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
211 /* Don't drop the frame and decrypt it in SW */
212 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
214 *crypt_len = IEEE80211_TKIP_IV_LEN;
215 /* fall through if TTAK OK */
217 case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
218 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
221 stats->flag |= RX_FLAG_DECRYPTED;
222 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
223 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
224 *crypt_len = IEEE80211_WEP_IV_LEN;
227 case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
228 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
230 stats->flag |= RX_FLAG_DECRYPTED;
234 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
241 * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
243 * Handles the actual data of the Rx packet from the fw
245 int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
246 struct iwl_device_cmd *cmd)
248 struct ieee80211_hdr *hdr;
249 struct ieee80211_rx_status *rx_status;
250 struct iwl_rx_packet *pkt = rxb_addr(rxb);
251 struct iwl_rx_phy_info *phy_info;
252 struct iwl_rx_mpdu_res_start *rx_res;
253 struct ieee80211_sta *sta;
261 phy_info = &mvm->last_phy_info;
262 rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
263 hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
264 len = le16_to_cpu(rx_res->byte_count);
265 rx_pkt_status = le32_to_cpup((__le32 *)
266 (pkt->data + sizeof(*rx_res) + len));
268 /* Dont use dev_alloc_skb(), we'll have enough headroom once
269 * ieee80211_hdr pulled.
271 skb = alloc_skb(128, GFP_ATOMIC);
273 IWL_ERR(mvm, "alloc_skb failed\n");
277 rx_status = IEEE80211_SKB_RXCB(skb);
280 * drop the packet if it has failed being decrypted by HW
282 if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
284 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
290 if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
291 IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
292 phy_info->cfg_phy_cnt);
298 * Keep packets with CRC errors (and with overrun) for monitor mode
299 * (otherwise the firmware discards them) but mark them as bad.
301 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
302 !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
303 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
304 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
307 /* This will be used in several places later */
308 rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
310 /* rx_status carries information about the packet to mac80211 */
311 rx_status->mactime = le64_to_cpu(phy_info->timestamp);
312 rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
314 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
315 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
317 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
320 * TSF as indicated by the fw is at INA time, but mac80211 expects the
321 * TSF at the beginning of the MPDU.
323 /*rx_status->flag |= RX_FLAG_MACTIME_MPDU;*/
325 iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
327 IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
328 (unsigned long long)rx_status->mactime);
332 * We have tx blocked stations (with CS bit). If we heard frames from
333 * a blocked station on a new channel we can TX to it again.
335 if (unlikely(mvm->csa_tx_block_bcn_timeout)) {
336 sta = ieee80211_find_sta(
337 rcu_dereference(mvm->csa_tx_blocked_vif), hdr->addr2);
339 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
342 /* This is fine since we don't support multiple AP interfaces */
343 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
345 struct iwl_mvm_sta *mvmsta;
346 mvmsta = iwl_mvm_sta_from_mac80211(sta);
347 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
352 /* set the preamble flag if appropriate */
353 if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
354 rx_status->flag |= RX_FLAG_SHORTPRE;
356 if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
358 * We know which subframes of an A-MPDU belong
359 * together since we get a single PHY response
360 * from the firmware for all of them
362 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
363 rx_status->ampdu_reference = mvm->ampdu_ref;
366 /* Set up the HT phy flags */
367 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
368 case RATE_MCS_CHAN_WIDTH_20:
370 case RATE_MCS_CHAN_WIDTH_40:
371 rx_status->flag |= RX_FLAG_40MHZ;
373 case RATE_MCS_CHAN_WIDTH_80:
374 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
376 case RATE_MCS_CHAN_WIDTH_160:
377 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
380 if (rate_n_flags & RATE_MCS_SGI_MSK)
381 rx_status->flag |= RX_FLAG_SHORT_GI;
382 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
383 rx_status->flag |= RX_FLAG_HT_GF;
384 if (rate_n_flags & RATE_MCS_LDPC_MSK)
385 rx_status->flag |= RX_FLAG_LDPC;
386 if (rate_n_flags & RATE_MCS_HT_MSK) {
387 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
389 rx_status->flag |= RX_FLAG_HT;
390 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
391 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
392 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
393 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
396 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
397 RATE_VHT_MCS_NSS_POS) + 1;
398 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
399 rx_status->flag |= RX_FLAG_VHT;
400 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
401 if (rate_n_flags & RATE_MCS_BF_MSK)
402 rx_status->vht_flag |= RX_VHT_FLAG_BF;
404 rx_status->rate_idx =
405 iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
409 #ifdef CONFIG_IWLWIFI_DEBUGFS
410 iwl_mvm_update_frame_stats(mvm, &mvm->drv_rx_stats, rate_n_flags,
411 rx_status->flag & RX_FLAG_AMPDU_DETAILS);
413 iwl_mvm_pass_packet_to_mac80211(mvm, skb, hdr, len, ampdu_status,
418 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
419 struct iwl_notif_statistics *stats)
422 * NOTE FW aggregates the statistics - BUT the statistics are cleared
423 * when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
426 lockdep_assert_held(&mvm->mutex);
427 memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
430 struct iwl_mvm_stat_data {
431 struct iwl_notif_statistics *stats;
435 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
436 struct ieee80211_vif *vif)
438 struct iwl_mvm_stat_data *data = _data;
439 struct iwl_notif_statistics *stats = data->stats;
440 struct iwl_mvm *mvm = data->mvm;
441 int sig = -stats->general.beacon_filter_average_energy;
443 int thold = vif->bss_conf.cqm_rssi_thold;
444 int hyst = vif->bss_conf.cqm_rssi_hyst;
445 u16 id = le32_to_cpu(stats->rx.general.mac_id);
446 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
448 if (mvmvif->id != id)
451 if (vif->type != NL80211_IFTYPE_STATION)
454 mvmvif->bf_data.ave_beacon_signal = sig;
457 if (mvmvif->bf_data.bt_coex_min_thold !=
458 mvmvif->bf_data.bt_coex_max_thold) {
459 last_event = mvmvif->bf_data.last_bt_coex_event;
460 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
461 (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
463 mvmvif->bf_data.last_bt_coex_event = sig;
464 IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
466 iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
467 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
468 (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
470 mvmvif->bf_data.last_bt_coex_event = sig;
471 IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
473 iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
477 if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
480 /* CQM Notification */
481 last_event = mvmvif->bf_data.last_cqm_event;
482 if (thold && sig < thold && (last_event == 0 ||
483 sig < last_event - hyst)) {
484 mvmvif->bf_data.last_cqm_event = sig;
485 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
487 ieee80211_cqm_rssi_notify(
489 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
491 } else if (sig > thold &&
492 (last_event == 0 || sig > last_event + hyst)) {
493 mvmvif->bf_data.last_cqm_event = sig;
494 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
496 ieee80211_cqm_rssi_notify(
498 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
504 * iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
506 * TODO: This handler is implemented partially.
508 int iwl_mvm_rx_statistics(struct iwl_mvm *mvm,
509 struct iwl_rx_cmd_buffer *rxb,
510 struct iwl_device_cmd *cmd)
512 struct iwl_rx_packet *pkt = rxb_addr(rxb);
513 struct iwl_notif_statistics *stats = (void *)&pkt->data;
514 struct mvm_statistics_general_common *common = &stats->general.common;
515 struct iwl_mvm_stat_data data = {
520 iwl_mvm_tt_temp_changed(mvm, le32_to_cpu(common->temperature));
522 iwl_mvm_update_rx_statistics(mvm, stats);
524 ieee80211_iterate_active_interfaces(mvm->hw,
525 IEEE80211_IFACE_ITER_NORMAL,
526 iwl_mvm_stat_iterator,