drivers/net/wireless/intel/iwlwifi/mvm/rxmq.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 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2015        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  * The full GNU General Public License is included in this distribution
  22  * in the file called COPYING.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  * BSD LICENSE
  29  *
  30  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  31  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  32  * Copyright(c) 2015        Intel Deutschland GmbH
  33  * All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  *
  39  *  * Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  *  * Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in
  43  *    the documentation and/or other materials provided with the
  44  *    distribution.
  45  *  * Neither the name Intel Corporation nor the names of its
  46  *    contributors may be used to endorse or promote products derived
  47  *    from this software without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  50  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  51  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  52  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  53  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  54  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  55  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  59  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  *****************************************************************************/
  61 #include <linux/etherdevice.h>
  62 #include <linux/skbuff.h>
  63 #include "iwl-trans.h"
  64 #include "mvm.h"
  65 #include "fw-api.h"
  66 #include "fw-dbg.h"
  67
  68 void iwl_mvm_rx_phy_cmd_mq(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  69 {
  70         mvm->ampdu_ref++;
  71
  72 #ifdef CONFIG_IWLWIFI_DEBUGFS
  73         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  74                 spin_lock(&mvm->drv_stats_lock);
  75                 mvm->drv_rx_stats.ampdu_count++;
  76                 spin_unlock(&mvm->drv_stats_lock);
  77         }
  78 #endif
  79 }
  80
  81 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
  82                                    int queue, struct ieee80211_sta *sta)
  83 {
  84         struct iwl_mvm_sta *mvmsta;
  85         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  86         struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
  87         struct iwl_mvm_key_pn *ptk_pn;
  88         u8 tid, keyidx;
  89         u8 pn[IEEE80211_CCMP_PN_LEN];
  90         u8 *extiv;
  91
  92         /* do PN checking */
  93
  94         /* multicast and non-data only arrives on default queue */
  95         if (!ieee80211_is_data(hdr->frame_control) ||
  96             is_multicast_ether_addr(hdr->addr1))
  97                 return 0;
  98
  99         /* do not check PN for open AP */
 100         if (!(stats->flag & RX_FLAG_DECRYPTED))
 101                 return 0;
 102
 103         /*
 104          * avoid checking for default queue - we don't want to replicate
 105          * all the logic that's necessary for checking the PN on fragmented
 106          * frames, leave that to mac80211
 107          */
 108         if (queue == 0)
 109                 return 0;
 110
 111         /* if we are here - this for sure is either CCMP or GCMP */
 112         if (IS_ERR_OR_NULL(sta)) {
 113                 IWL_ERR(mvm,
 114                         "expected hw-decrypted unicast frame for station\n");
 115                 return -1;
 116         }
 117
 118         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 119
 120         extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
 121         keyidx = extiv[3] >> 6;
 122
 123         ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
 124         if (!ptk_pn)
 125                 return -1;
 126
 127         if (ieee80211_is_data_qos(hdr->frame_control))
 128                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 129         else
 130                 tid = 0;
 131
 132         /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
 133         if (tid >= IWL_MAX_TID_COUNT)
 134                 return -1;
 135
 136         /* load pn */
 137         pn[0] = extiv[7];
 138         pn[1] = extiv[6];
 139         pn[2] = extiv[5];
 140         pn[3] = extiv[4];
 141         pn[4] = extiv[1];
 142         pn[5] = extiv[0];
 143
 144         if (memcmp(pn, ptk_pn->q[queue].pn[tid],
 145                    IEEE80211_CCMP_PN_LEN) <= 0)
 146                 return -1;
 147
 148         memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
 149         stats->flag |= RX_FLAG_PN_VALIDATED;
 150
 151         return 0;
 152 }
 153
 154 /* iwl_mvm_create_skb Adds the rxb to a new skb */
 155 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
 156                                u16 len, u8 crypt_len,
 157                                struct iwl_rx_cmd_buffer *rxb)
 158 {
 159         unsigned int hdrlen, fraglen;
 160
 161         /* If frame is small enough to fit in skb->head, pull it completely.
 162          * If not, only pull ieee80211_hdr (including crypto if present, and
 163          * an additional 8 bytes for SNAP/ethertype, see below) so that
 164          * splice() or TCP coalesce are more efficient.
 165          *
 166          * Since, in addition, ieee80211_data_to_8023() always pull in at
 167          * least 8 bytes (possibly more for mesh) we can do the same here
 168          * to save the cost of doing it later. That still doesn't pull in
 169          * the actual IP header since the typical case has a SNAP header.
 170          * If the latter changes (there are efforts in the standards group
 171          * to do so) we should revisit this and ieee80211_data_to_8023().
 172          */
 173         hdrlen = (len <= skb_tailroom(skb)) ? len :
 174                                               sizeof(*hdr) + crypt_len + 8;
 175
 176         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 177         fraglen = len - hdrlen;
 178
 179         if (fraglen) {
 180                 int offset = (void *)hdr + hdrlen -
 181                              rxb_addr(rxb) + rxb_offset(rxb);
 182
 183                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 184                                 fraglen, rxb->truesize);
 185         }
 186 }
 187
 188 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
 189 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 190                                             struct napi_struct *napi,
 191                                             struct sk_buff *skb, int queue,
 192                                             struct ieee80211_sta *sta)
 193 {
 194         if (iwl_mvm_check_pn(mvm, skb, queue, sta))
 195                 kfree_skb(skb);
 196         else
 197                 ieee80211_rx_napi(mvm->hw, skb, napi);
 198 }
 199
 200 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 201                                         struct iwl_rx_mpdu_desc *desc,
 202                                         struct ieee80211_rx_status *rx_status)
 203 {
 204         int energy_a, energy_b, energy_c, max_energy;
 205
 206         energy_a = desc->energy_a;
 207         energy_a = energy_a ? -energy_a : S8_MIN;
 208         energy_b = desc->energy_b;
 209         energy_b = energy_b ? -energy_b : S8_MIN;
 210         energy_c = desc->energy_c;
 211         energy_c = energy_c ? -energy_c : S8_MIN;
 212         max_energy = max(energy_a, energy_b);
 213         max_energy = max(max_energy, energy_c);
 214
 215         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 216                         energy_a, energy_b, energy_c, max_energy);
 217
 218         rx_status->signal = max_energy;
 219         rx_status->chains = 0; /* TODO: phy info */
 220         rx_status->chain_signal[0] = energy_a;
 221         rx_status->chain_signal[1] = energy_b;
 222         rx_status->chain_signal[2] = energy_c;
 223 }
 224
 225 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 226                              struct ieee80211_rx_status *stats,
 227                              struct iwl_rx_mpdu_desc *desc, int queue,
 228                              u8 *crypt_len)
 229 {
 230         u16 status = le16_to_cpu(desc->status);
 231
 232         if (!ieee80211_has_protected(hdr->frame_control) ||
 233             (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 234             IWL_RX_MPDU_STATUS_SEC_NONE)
 235                 return 0;
 236
 237         /* TODO: handle packets encrypted with unknown alg */
 238
 239         switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
 240         case IWL_RX_MPDU_STATUS_SEC_CCM:
 241         case IWL_RX_MPDU_STATUS_SEC_GCM:
 242                 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
 243                 /* alg is CCM: check MIC only */
 244                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 245                         return -1;
 246
 247                 stats->flag |= RX_FLAG_DECRYPTED;
 248                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 249                 return 0;
 250         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 251                 /* Don't drop the frame and decrypt it in SW */
 252                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 253                         return 0;
 254
 255                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 256                 /* fall through if TTAK OK */
 257         case IWL_RX_MPDU_STATUS_SEC_WEP:
 258                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 259                         return -1;
 260
 261                 stats->flag |= RX_FLAG_DECRYPTED;
 262                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 263                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 264                         *crypt_len = IEEE80211_WEP_IV_LEN;
 265                 return 0;
 266         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 267                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 268                         return -1;
 269                 stats->flag |= RX_FLAG_DECRYPTED;
 270                 return 0;
 271         default:
 272                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 273         }
 274
 275         return 0;
 276 }
 277
 278 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 279                             struct sk_buff *skb,
 280                             struct iwl_rx_mpdu_desc *desc)
 281 {
 282         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 283         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 284
 285         if (mvmvif->features & NETIF_F_RXCSUM &&
 286             desc->l3l4_flags & cpu_to_le16(IWL_RX_L3L4_IP_HDR_CSUM_OK) &&
 287             desc->l3l4_flags & cpu_to_le16(IWL_RX_L3L4_TCP_UDP_CSUM_OK))
 288                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 289 }
 290
 291 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 292                         struct iwl_rx_cmd_buffer *rxb, int queue)
 293 {
 294         struct ieee80211_rx_status *rx_status;
 295         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 296         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 297         struct ieee80211_hdr *hdr = (void *)(desc + 1);
 298         u32 len = le16_to_cpu(desc->mpdu_len);
 299         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 300         struct ieee80211_sta *sta = NULL;
 301         struct sk_buff *skb;
 302         u8 crypt_len = 0;
 303
 304         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 305          * ieee80211_hdr pulled.
 306          */
 307         skb = alloc_skb(128, GFP_ATOMIC);
 308         if (!skb) {
 309                 IWL_ERR(mvm, "alloc_skb failed\n");
 310                 return;
 311         }
 312
 313         rx_status = IEEE80211_SKB_RXCB(skb);
 314
 315         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 316                 kfree_skb(skb);
 317                 return;
 318         }
 319
 320         /*
 321          * Keep packets with CRC errors (and with overrun) for monitor mode
 322          * (otherwise the firmware discards them) but mark them as bad.
 323          */
 324         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 325             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 326                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 327                              le16_to_cpu(desc->status));
 328                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 329         }
 330
 331         rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 332         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 333         rx_status->band = desc->channel > 14 ? IEEE80211_BAND_5GHZ :
 334                                                IEEE80211_BAND_2GHZ;
 335         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 336                                                          rx_status->band);
 337         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 338
 339         rcu_read_lock();
 340
 341         if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
 342                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 343
 344                 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
 345                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 346                         if (IS_ERR(sta))
 347                                 sta = NULL;
 348                 }
 349         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 350                 /*
 351                  * This is fine since we prevent two stations with the same
 352                  * address from being added.
 353                  */
 354                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 355         }
 356
 357         if (sta) {
 358                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 359
 360                 /*
 361                  * We have tx blocked stations (with CS bit). If we heard
 362                  * frames from a blocked station on a new channel we can
 363                  * TX to it again.
 364                  */
 365                 if (unlikely(mvm->csa_tx_block_bcn_timeout))
 366                         iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
 367
 368                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 369
 370                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 371                     ieee80211_is_beacon(hdr->frame_control)) {
 372                         struct iwl_fw_dbg_trigger_tlv *trig;
 373                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 374                         bool trig_check;
 375                         s32 rssi;
 376
 377                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 378                                                       FW_DBG_TRIGGER_RSSI);
 379                         rssi_trig = (void *)trig->data;
 380                         rssi = le32_to_cpu(rssi_trig->rssi);
 381
 382                         trig_check =
 383                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 384                                                               trig);
 385                         if (trig_check && rx_status->signal < rssi)
 386                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 387                 }
 388
 389                 /* TODO: multi queue TCM */
 390
 391                 if (ieee80211_is_data(hdr->frame_control))
 392                         iwl_mvm_rx_csum(sta, skb, desc);
 393         }
 394
 395         /*
 396          * TODO: PHY info.
 397          * Verify we don't have the information in the MPDU descriptor and
 398          * that it is not needed.
 399          * Make sure for monitor mode that we are on default queue, update
 400          * ampdu_ref and the rest of phy info then
 401          */
 402
 403         /* Set up the HT phy flags */
 404         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 405         case RATE_MCS_CHAN_WIDTH_20:
 406                 break;
 407         case RATE_MCS_CHAN_WIDTH_40:
 408                 rx_status->flag |= RX_FLAG_40MHZ;
 409                 break;
 410         case RATE_MCS_CHAN_WIDTH_80:
 411                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 412                 break;
 413         case RATE_MCS_CHAN_WIDTH_160:
 414                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 415                 break;
 416         }
 417         if (rate_n_flags & RATE_MCS_SGI_MSK)
 418                 rx_status->flag |= RX_FLAG_SHORT_GI;
 419         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 420                 rx_status->flag |= RX_FLAG_HT_GF;
 421         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 422                 rx_status->flag |= RX_FLAG_LDPC;
 423         if (rate_n_flags & RATE_MCS_HT_MSK) {
 424                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 425                                 RATE_MCS_STBC_POS;
 426                 rx_status->flag |= RX_FLAG_HT;
 427                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 428                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 429         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 430                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 431                                 RATE_MCS_STBC_POS;
 432                 rx_status->vht_nss =
 433                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 434                                                 RATE_VHT_MCS_NSS_POS) + 1;
 435                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 436                 rx_status->flag |= RX_FLAG_VHT;
 437                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 438                 if (rate_n_flags & RATE_MCS_BF_MSK)
 439                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 440         } else {
 441                 rx_status->rate_idx =
 442                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 443                                                             rx_status->band);
 444         }
 445
 446         /* TODO: PHY info - update ampdu queue statistics (for debugfs) */
 447         /* TODO: PHY info - gscan */
 448
 449         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
 450         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
 451         rcu_read_unlock();
 452 }
 453
 454 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm,
 455                               struct iwl_rx_cmd_buffer *rxb, int queue)
 456 {
 457         /* TODO */
 458 }