drivers/net/wireless/iwlwifi/mvm/rx.c

   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 - 2014 Intel Mobile Communications GmbH
  10  *
  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.
  14  *
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  29  *  Intel Linux Wireless <ilw@linux.intel.com>
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  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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  49  *    contributors may be used to endorse or promote products derived
  50  *    from this software without specific prior written permission.
  51  *
  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,
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  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"
  65 #include "mvm.h"
  66 #include "fw-api.h"
  67
  68 /*
  69  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  70  *
  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.
  73  */
  74 int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
  75                           struct iwl_device_cmd *cmd)
  76 {
  77         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  78
  79         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  80         mvm->ampdu_ref++;
  81
  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);
  87         }
  88 #endif
  89
  90         return 0;
  91 }
  92
  93 /*
  94  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  95  *
  96  * Adds the rxb to a new skb and give it to mac80211
  97  */
  98 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  99                                             struct ieee80211_hdr *hdr, u16 len,
 100                                             u32 ampdu_status,
 101                                             struct iwl_rx_cmd_buffer *rxb,
 102                                             struct ieee80211_rx_status *stats)
 103 {
 104         struct sk_buff *skb;
 105         unsigned int hdrlen, fraglen;
 106
 107         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 108          * ieee80211_hdr pulled.
 109          */
 110         skb = alloc_skb(128, GFP_ATOMIC);
 111         if (!skb) {
 112                 IWL_ERR(mvm, "alloc_skb failed\n");
 113                 return;
 114         }
 115         /* If frame is small enough to fit in skb->head, pull it completely.
 116          * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
 117          * are more efficient.
 118          */
 119         hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
 120
 121         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 122         fraglen = len - hdrlen;
 123
 124         if (fraglen) {
 125                 int offset = (void *)hdr + hdrlen -
 126                              rxb_addr(rxb) + rxb_offset(rxb);
 127
 128                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 129                                 fraglen, rxb->truesize);
 130         }
 131
 132         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 133
 134         ieee80211_rx(mvm->hw, skb);
 135 }
 136
 137 /*
 138  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 139  * values are reported by the fw as positive values - need to negate
 140  * to obtain their dBM.  Account for missing antennas by replacing 0
 141  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 142  */
 143 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 144                                         struct iwl_rx_phy_info *phy_info,
 145                                         struct ieee80211_rx_status *rx_status)
 146 {
 147         int energy_a, energy_b, energy_c, max_energy;
 148         u32 val;
 149
 150         val =
 151             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 152         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 153                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 154         energy_a = energy_a ? -energy_a : S8_MIN;
 155         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 156                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 157         energy_b = energy_b ? -energy_b : S8_MIN;
 158         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 159                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 160         energy_c = energy_c ? -energy_c : S8_MIN;
 161         max_energy = max(energy_a, energy_b);
 162         max_energy = max(max_energy, energy_c);
 163
 164         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 165                         energy_a, energy_b, energy_c, max_energy);
 166
 167         rx_status->signal = max_energy;
 168         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 169                                 RX_RES_PHY_FLAGS_ANTENNA)
 170                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 171         rx_status->chain_signal[0] = energy_a;
 172         rx_status->chain_signal[1] = energy_b;
 173         rx_status->chain_signal[2] = energy_c;
 174 }
 175
 176 /*
 177  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 178  * @mvm: the mvm object
 179  * @hdr: 80211 header
 180  * @stats: status in mac80211's format
 181  * @rx_pkt_status: status coming from fw
 182  *
 183  * returns non 0 value if the packet should be dropped
 184  */
 185 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 186                                         struct ieee80211_hdr *hdr,
 187                                         struct ieee80211_rx_status *stats,
 188                                         u32 rx_pkt_status)
 189 {
 190         if (!ieee80211_has_protected(hdr->frame_control) ||
 191             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 192                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 193                 return 0;
 194
 195         /* packet was encrypted with unknown alg */
 196         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 197                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 198                 return 0;
 199
 200         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 201         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 202                 /* alg is CCM: check MIC only */
 203                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 204                         return -1;
 205
 206                 stats->flag |= RX_FLAG_DECRYPTED;
 207                 IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
 208                 return 0;
 209
 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))
 213                         return 0;
 214                 /* fall through if TTAK OK */
 215
 216         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 217                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 218                         return -1;
 219
 220                 stats->flag |= RX_FLAG_DECRYPTED;
 221                 return 0;
 222
 223         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 224                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 225                         return -1;
 226                 stats->flag |= RX_FLAG_DECRYPTED;
 227                 return 0;
 228
 229         default:
 230                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 231         }
 232
 233         return 0;
 234 }
 235
 236 /*
 237  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 238  *
 239  * Handles the actual data of the Rx packet from the fw
 240  */
 241 int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 242                        struct iwl_device_cmd *cmd)
 243 {
 244         struct ieee80211_hdr *hdr;
 245         struct ieee80211_rx_status rx_status = {};
 246         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 247         struct iwl_rx_phy_info *phy_info;
 248         struct iwl_rx_mpdu_res_start *rx_res;
 249         u32 len;
 250         u32 ampdu_status;
 251         u32 rate_n_flags;
 252         u32 rx_pkt_status;
 253
 254         phy_info = &mvm->last_phy_info;
 255         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 256         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 257         len = le16_to_cpu(rx_res->byte_count);
 258         rx_pkt_status = le32_to_cpup((__le32 *)
 259                 (pkt->data + sizeof(*rx_res) + len));
 260
 261         memset(&rx_status, 0, sizeof(rx_status));
 262
 263         /*
 264          * We have tx blocked stations (with CS bit). If we heard frames from
 265          * a blocked station on a new channel we can TX to it again.
 266          */
 267         if (unlikely(mvm->csa_tx_block_bcn_timeout)) {
 268                 struct ieee80211_sta *sta;
 269
 270                 rcu_read_lock();
 271
 272                 sta = ieee80211_find_sta(
 273                         rcu_dereference(mvm->csa_tx_blocked_vif), hdr->addr2);
 274                 if (sta)
 275                         iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
 276
 277                 rcu_read_unlock();
 278         }
 279
 280         /*
 281          * drop the packet if it has failed being decrypted by HW
 282          */
 283         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",
 285                                rx_pkt_status);
 286                 return 0;
 287         }
 288
 289         if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
 290                 IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
 291                                phy_info->cfg_phy_cnt);
 292                 return 0;
 293         }
 294
 295         /*
 296          * Keep packets with CRC errors (and with overrun) for monitor mode
 297          * (otherwise the firmware discards them) but mark them as bad.
 298          */
 299         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 300             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 301                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 302                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 303         }
 304
 305         /* This will be used in several places later */
 306         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 307
 308         /* rx_status carries information about the packet to mac80211 */
 309         rx_status.mactime = le64_to_cpu(phy_info->timestamp);
 310         rx_status.device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 311         rx_status.band =
 312                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 313                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 314         rx_status.freq =
 315                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 316                                                rx_status.band);
 317         /*
 318          * TSF as indicated by the fw is at INA time, but mac80211 expects the
 319          * TSF at the beginning of the MPDU.
 320          */
 321         /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
 322
 323         iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
 324
 325         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
 326                               (unsigned long long)rx_status.mactime);
 327
 328         /* set the preamble flag if appropriate */
 329         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 330                 rx_status.flag |= RX_FLAG_SHORTPRE;
 331
 332         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 333                 /*
 334                  * We know which subframes of an A-MPDU belong
 335                  * together since we get a single PHY response
 336                  * from the firmware for all of them
 337                  */
 338                 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
 339                 rx_status.ampdu_reference = mvm->ampdu_ref;
 340         }
 341
 342         /* Set up the HT phy flags */
 343         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 344         case RATE_MCS_CHAN_WIDTH_20:
 345                 break;
 346         case RATE_MCS_CHAN_WIDTH_40:
 347                 rx_status.flag |= RX_FLAG_40MHZ;
 348                 break;
 349         case RATE_MCS_CHAN_WIDTH_80:
 350                 rx_status.vht_flag |= RX_VHT_FLAG_80MHZ;
 351                 break;
 352         case RATE_MCS_CHAN_WIDTH_160:
 353                 rx_status.vht_flag |= RX_VHT_FLAG_160MHZ;
 354                 break;
 355         }
 356         if (rate_n_flags & RATE_MCS_SGI_MSK)
 357                 rx_status.flag |= RX_FLAG_SHORT_GI;
 358         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 359                 rx_status.flag |= RX_FLAG_HT_GF;
 360         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 361                 rx_status.flag |= RX_FLAG_LDPC;
 362         if (rate_n_flags & RATE_MCS_HT_MSK) {
 363                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 364                                 RATE_MCS_STBC_POS;
 365                 rx_status.flag |= RX_FLAG_HT;
 366                 rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 367                 rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
 368         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 369                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 370                                 RATE_MCS_STBC_POS;
 371                 rx_status.vht_nss =
 372                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 373                                                 RATE_VHT_MCS_NSS_POS) + 1;
 374                 rx_status.rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 375                 rx_status.flag |= RX_FLAG_VHT;
 376                 rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
 377                 if (rate_n_flags & RATE_MCS_BF_MSK)
 378                         rx_status.vht_flag |= RX_VHT_FLAG_BF;
 379         } else {
 380                 rx_status.rate_idx =
 381                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 382                                                             rx_status.band);
 383         }
 384
 385 #ifdef CONFIG_IWLWIFI_DEBUGFS
 386         iwl_mvm_update_frame_stats(mvm, &mvm->drv_rx_stats, rate_n_flags,
 387                                    rx_status.flag & RX_FLAG_AMPDU_DETAILS);
 388 #endif
 389         iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
 390                                         rxb, &rx_status);
 391         return 0;
 392 }
 393
 394 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
 395                                          struct iwl_notif_statistics *stats)
 396 {
 397         /*
 398          * NOTE FW aggregates the statistics - BUT the statistics are cleared
 399          * when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
 400          * bit set.
 401          */
 402         lockdep_assert_held(&mvm->mutex);
 403         memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
 404 }
 405
 406 struct iwl_mvm_stat_data {
 407         struct iwl_notif_statistics *stats;
 408         struct iwl_mvm *mvm;
 409 };
 410
 411 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 412                                   struct ieee80211_vif *vif)
 413 {
 414         struct iwl_mvm_stat_data *data = _data;
 415         struct iwl_notif_statistics *stats = data->stats;
 416         struct iwl_mvm *mvm = data->mvm;
 417         int sig = -stats->general.beacon_filter_average_energy;
 418         int last_event;
 419         int thold = vif->bss_conf.cqm_rssi_thold;
 420         int hyst = vif->bss_conf.cqm_rssi_hyst;
 421         u16 id = le32_to_cpu(stats->rx.general.mac_id);
 422         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 423
 424         if (mvmvif->id != id)
 425                 return;
 426
 427         if (vif->type != NL80211_IFTYPE_STATION)
 428                 return;
 429
 430         mvmvif->bf_data.ave_beacon_signal = sig;
 431
 432         /* BT Coex */
 433         if (mvmvif->bf_data.bt_coex_min_thold !=
 434             mvmvif->bf_data.bt_coex_max_thold) {
 435                 last_event = mvmvif->bf_data.last_bt_coex_event;
 436                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 437                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 438                      last_event == 0)) {
 439                         mvmvif->bf_data.last_bt_coex_event = sig;
 440                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 441                                      sig);
 442                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 443                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 444                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 445                             last_event == 0)) {
 446                         mvmvif->bf_data.last_bt_coex_event = sig;
 447                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 448                                      sig);
 449                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 450                 }
 451         }
 452
 453         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 454                 return;
 455
 456         /* CQM Notification */
 457         last_event = mvmvif->bf_data.last_cqm_event;
 458         if (thold && sig < thold && (last_event == 0 ||
 459                                      sig < last_event - hyst)) {
 460                 mvmvif->bf_data.last_cqm_event = sig;
 461                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 462                              sig);
 463                 ieee80211_cqm_rssi_notify(
 464                         vif,
 465                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 466                         GFP_KERNEL);
 467         } else if (sig > thold &&
 468                    (last_event == 0 || sig > last_event + hyst)) {
 469                 mvmvif->bf_data.last_cqm_event = sig;
 470                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 471                              sig);
 472                 ieee80211_cqm_rssi_notify(
 473                         vif,
 474                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 475                         GFP_KERNEL);
 476         }
 477 }
 478
 479 /*
 480  * iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
 481  *
 482  * TODO: This handler is implemented partially.
 483  */
 484 int iwl_mvm_rx_statistics(struct iwl_mvm *mvm,
 485                           struct iwl_rx_cmd_buffer *rxb,
 486                           struct iwl_device_cmd *cmd)
 487 {
 488         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 489         struct iwl_notif_statistics *stats = (void *)&pkt->data;
 490         struct mvm_statistics_general_common *common = &stats->general.common;
 491         struct iwl_mvm_stat_data data = {
 492                 .stats = stats,
 493                 .mvm = mvm,
 494         };
 495
 496         /*
 497          * set temperature debug enabled - ignore FW temperature updates
 498          * and use the user set temperature.
 499          */
 500         if (mvm->temperature_test) {
 501                 if (mvm->temperature < le32_to_cpu(common->temperature))
 502                         IWL_DEBUG_TEMP(mvm,
 503                                        "Ignoring FW temperature update that is greater than the debug set temperature (debug temp = %d, fw temp = %d)\n",
 504                                        mvm->temperature,
 505                                        le32_to_cpu(common->temperature));
 506                 /*
 507                  * skip iwl_mvm_tt_handler since we are in
 508                  * temperature debug mode and we are ignoring
 509                  * the new temperature value
 510                  */
 511                 goto update;
 512         }
 513
 514         if (mvm->temperature != le32_to_cpu(common->temperature)) {
 515                 mvm->temperature = le32_to_cpu(common->temperature);
 516                 iwl_mvm_tt_handler(mvm);
 517         }
 518 update:
 519         iwl_mvm_update_rx_statistics(mvm, stats);
 520
 521         ieee80211_iterate_active_interfaces(mvm->hw,
 522                                             IEEE80211_IFACE_ITER_NORMAL,
 523                                             iwl_mvm_stat_iterator,
 524                                             &data);
 525         return 0;
 526 }