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.
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  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
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  28  *  Intel Linux Wireless <ilw@linux.intel.com>
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  32  *
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  44  *    the documentation and/or other materials provided with the
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  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *****************************************************************************/
  62 #include "iwl-trans.h"
  63 #include "mvm.h"
  64 #include "fw-api.h"
  65
  66 /*
  67  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  68  *
  69  * Copies the phy information in mvm->last_phy_info, it will be used when the
  70  * actual data will come from the fw in the next packet.
  71  */
  72 int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
  73                           struct iwl_device_cmd *cmd)
  74 {
  75         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  76
  77         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  78         mvm->ampdu_ref++;
  79
  80 #ifdef CONFIG_IWLWIFI_DEBUGFS
  81         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  82                 spin_lock(&mvm->drv_stats_lock);
  83                 mvm->drv_rx_stats.ampdu_count++;
  84                 spin_unlock(&mvm->drv_stats_lock);
  85         }
  86 #endif
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  93  *
  94  * Adds the rxb to a new skb and give it to mac80211
  95  */
  96 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  97                                             struct ieee80211_hdr *hdr, u16 len,
  98                                             u32 ampdu_status,
  99                                             struct iwl_rx_cmd_buffer *rxb,
 100                                             struct ieee80211_rx_status *stats)
 101 {
 102         struct sk_buff *skb;
 103         unsigned int hdrlen, fraglen;
 104
 105         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 106          * ieee80211_hdr pulled.
 107          */
 108         skb = alloc_skb(128, GFP_ATOMIC);
 109         if (!skb) {
 110                 IWL_ERR(mvm, "alloc_skb failed\n");
 111                 return;
 112         }
 113         /* If frame is small enough to fit in skb->head, pull it completely.
 114          * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
 115          * are more efficient.
 116          */
 117         hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
 118
 119         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 120         fraglen = len - hdrlen;
 121
 122         if (fraglen) {
 123                 int offset = (void *)hdr + hdrlen -
 124                              rxb_addr(rxb) + rxb_offset(rxb);
 125
 126                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 127                                 fraglen, rxb->truesize);
 128         }
 129
 130         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 131
 132         ieee80211_rx(mvm->hw, skb);
 133 }
 134
 135 /*
 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.
 140  */
 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)
 144 {
 145         int energy_a, energy_b, energy_c, max_energy;
 146         u32 val;
 147
 148         val =
 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 : -256;
 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 : -256;
 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 : -256;
 159         max_energy = max(energy_a, energy_b);
 160         max_energy = max(max_energy, energy_c);
 161
 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);
 164
 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;
 172 }
 173
 174 /*
 175  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 176  * @mvm: the mvm object
 177  * @hdr: 80211 header
 178  * @stats: status in mac80211's format
 179  * @rx_pkt_status: status coming from fw
 180  *
 181  * returns non 0 value if the packet should be dropped
 182  */
 183 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 184                                         struct ieee80211_hdr *hdr,
 185                                         struct ieee80211_rx_status *stats,
 186                                         u32 rx_pkt_status)
 187 {
 188         if (!ieee80211_has_protected(hdr->frame_control) ||
 189             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 190                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 191                 return 0;
 192
 193         /* packet was encrypted with unknown alg */
 194         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 195                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 196                 return 0;
 197
 198         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 199         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 200                 /* alg is CCM: check MIC only */
 201                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 202                         return -1;
 203
 204                 stats->flag |= RX_FLAG_DECRYPTED;
 205                 IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
 206                 return 0;
 207
 208         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 209                 /* Don't drop the frame and decrypt it in SW */
 210                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 211                         return 0;
 212                 /* fall through if TTAK OK */
 213
 214         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 215                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 216                         return -1;
 217
 218                 stats->flag |= RX_FLAG_DECRYPTED;
 219                 return 0;
 220
 221         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 222                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 223                         return -1;
 224                 stats->flag |= RX_FLAG_DECRYPTED;
 225                 return 0;
 226
 227         default:
 228                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 229         }
 230
 231         return 0;
 232 }
 233
 234 /*
 235  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 236  *
 237  * Handles the actual data of the Rx packet from the fw
 238  */
 239 int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 240                        struct iwl_device_cmd *cmd)
 241 {
 242         struct ieee80211_hdr *hdr;
 243         struct ieee80211_rx_status rx_status = {};
 244         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 245         struct iwl_rx_phy_info *phy_info;
 246         struct iwl_rx_mpdu_res_start *rx_res;
 247         u32 len;
 248         u32 ampdu_status;
 249         u32 rate_n_flags;
 250         u32 rx_pkt_status;
 251
 252         phy_info = &mvm->last_phy_info;
 253         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 254         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 255         len = le16_to_cpu(rx_res->byte_count);
 256         rx_pkt_status = le32_to_cpup((__le32 *)
 257                 (pkt->data + sizeof(*rx_res) + len));
 258
 259         memset(&rx_status, 0, sizeof(rx_status));
 260
 261         /*
 262          * drop the packet if it has failed being decrypted by HW
 263          */
 264         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, &rx_status, rx_pkt_status)) {
 265                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 266                                rx_pkt_status);
 267                 return 0;
 268         }
 269
 270         if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
 271                 IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
 272                                phy_info->cfg_phy_cnt);
 273                 return 0;
 274         }
 275
 276         /*
 277          * Keep packets with CRC errors (and with overrun) for monitor mode
 278          * (otherwise the firmware discards them) but mark them as bad.
 279          */
 280         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 281             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 282                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 283                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 284         }
 285
 286         /* This will be used in several places later */
 287         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 288
 289         /* rx_status carries information about the packet to mac80211 */
 290         rx_status.mactime = le64_to_cpu(phy_info->timestamp);
 291         rx_status.device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 292         rx_status.band =
 293                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 294                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 295         rx_status.freq =
 296                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 297                                                rx_status.band);
 298         /*
 299          * TSF as indicated by the fw is at INA time, but mac80211 expects the
 300          * TSF at the beginning of the MPDU.
 301          */
 302         /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
 303
 304         iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
 305
 306         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
 307                               (unsigned long long)rx_status.mactime);
 308
 309         /* set the preamble flag if appropriate */
 310         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 311                 rx_status.flag |= RX_FLAG_SHORTPRE;
 312
 313         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 314                 /*
 315                  * We know which subframes of an A-MPDU belong
 316                  * together since we get a single PHY response
 317                  * from the firmware for all of them
 318                  */
 319                 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
 320                 rx_status.ampdu_reference = mvm->ampdu_ref;
 321         }
 322
 323         /* Set up the HT phy flags */
 324         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 325         case RATE_MCS_CHAN_WIDTH_20:
 326                 break;
 327         case RATE_MCS_CHAN_WIDTH_40:
 328                 rx_status.flag |= RX_FLAG_40MHZ;
 329                 break;
 330         case RATE_MCS_CHAN_WIDTH_80:
 331                 rx_status.vht_flag |= RX_VHT_FLAG_80MHZ;
 332                 break;
 333         case RATE_MCS_CHAN_WIDTH_160:
 334                 rx_status.vht_flag |= RX_VHT_FLAG_160MHZ;
 335                 break;
 336         }
 337         if (rate_n_flags & RATE_MCS_SGI_MSK)
 338                 rx_status.flag |= RX_FLAG_SHORT_GI;
 339         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 340                 rx_status.flag |= RX_FLAG_HT_GF;
 341         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 342                 rx_status.flag |= RX_FLAG_LDPC;
 343         if (rate_n_flags & RATE_MCS_HT_MSK) {
 344                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 345                                 RATE_MCS_STBC_POS;
 346                 rx_status.flag |= RX_FLAG_HT;
 347                 rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 348                 rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
 349         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 350                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 351                                 RATE_MCS_STBC_POS;
 352                 rx_status.vht_nss =
 353                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 354                                                 RATE_VHT_MCS_NSS_POS) + 1;
 355                 rx_status.rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 356                 rx_status.flag |= RX_FLAG_VHT;
 357                 rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
 358                 if (rate_n_flags & RATE_MCS_BF_MSK)
 359                         rx_status.vht_flag |= RX_VHT_FLAG_BF;
 360         } else {
 361                 rx_status.rate_idx =
 362                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 363                                                             rx_status.band);
 364         }
 365
 366 #ifdef CONFIG_IWLWIFI_DEBUGFS
 367         iwl_mvm_update_frame_stats(mvm, &mvm->drv_rx_stats, rate_n_flags,
 368                                    rx_status.flag & RX_FLAG_AMPDU_DETAILS);
 369 #endif
 370         iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
 371                                         rxb, &rx_status);
 372         return 0;
 373 }
 374
 375 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
 376                                          struct iwl_notif_statistics *stats)
 377 {
 378         /*
 379          * NOTE FW aggregates the statistics - BUT the statistics are cleared
 380          * when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
 381          * bit set.
 382          */
 383         lockdep_assert_held(&mvm->mutex);
 384         memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
 385 }
 386
 387 struct iwl_mvm_stat_data {
 388         struct iwl_notif_statistics *stats;
 389         struct iwl_mvm *mvm;
 390 };
 391
 392 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 393                                   struct ieee80211_vif *vif)
 394 {
 395         struct iwl_mvm_stat_data *data = _data;
 396         struct iwl_notif_statistics *stats = data->stats;
 397         struct iwl_mvm *mvm = data->mvm;
 398         int sig = -stats->general.beacon_filter_average_energy;
 399         int last_event;
 400         int thold = vif->bss_conf.cqm_rssi_thold;
 401         int hyst = vif->bss_conf.cqm_rssi_hyst;
 402         u16 id = le32_to_cpu(stats->rx.general.mac_id);
 403         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 404
 405         if (mvmvif->id != id)
 406                 return;
 407
 408         if (vif->type != NL80211_IFTYPE_STATION)
 409                 return;
 410
 411         mvmvif->bf_data.ave_beacon_signal = sig;
 412
 413         /* BT Coex */
 414         if (mvmvif->bf_data.bt_coex_min_thold !=
 415             mvmvif->bf_data.bt_coex_max_thold) {
 416                 last_event = mvmvif->bf_data.last_bt_coex_event;
 417                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 418                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 419                      last_event == 0)) {
 420                         mvmvif->bf_data.last_bt_coex_event = sig;
 421                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 422                                      sig);
 423                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 424                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 425                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 426                             last_event == 0)) {
 427                         mvmvif->bf_data.last_bt_coex_event = sig;
 428                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 429                                      sig);
 430                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 431                 }
 432         }
 433
 434         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 435                 return;
 436
 437         /* CQM Notification */
 438         last_event = mvmvif->bf_data.last_cqm_event;
 439         if (thold && sig < thold && (last_event == 0 ||
 440                                      sig < last_event - hyst)) {
 441                 mvmvif->bf_data.last_cqm_event = sig;
 442                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 443                              sig);
 444                 ieee80211_cqm_rssi_notify(
 445                         vif,
 446                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 447                         GFP_KERNEL);
 448         } else if (sig > thold &&
 449                    (last_event == 0 || sig > last_event + hyst)) {
 450                 mvmvif->bf_data.last_cqm_event = sig;
 451                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 452                              sig);
 453                 ieee80211_cqm_rssi_notify(
 454                         vif,
 455                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 456                         GFP_KERNEL);
 457         }
 458 }
 459
 460 /*
 461  * iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
 462  *
 463  * TODO: This handler is implemented partially.
 464  */
 465 int iwl_mvm_rx_statistics(struct iwl_mvm *mvm,
 466                           struct iwl_rx_cmd_buffer *rxb,
 467                           struct iwl_device_cmd *cmd)
 468 {
 469         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 470         struct iwl_notif_statistics *stats = (void *)&pkt->data;
 471         struct mvm_statistics_general_common *common = &stats->general.common;
 472         struct iwl_mvm_stat_data data = {
 473                 .stats = stats,
 474                 .mvm = mvm,
 475         };
 476
 477         if (mvm->temperature != le32_to_cpu(common->temperature)) {
 478                 mvm->temperature = le32_to_cpu(common->temperature);
 479                 iwl_mvm_tt_handler(mvm);
 480         }
 481         iwl_mvm_update_rx_statistics(mvm, stats);
 482
 483         ieee80211_iterate_active_interfaces(mvm->hw,
 484                                             IEEE80211_IFACE_ITER_NORMAL,
 485                                             iwl_mvm_stat_iterator,
 486                                             &data);
 487         return 0;
 488 }