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 - 2016 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 - 2016 Intel Deutschland GmbH
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  34  *
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  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.
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  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         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 160         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 161         unsigned int headlen, fraglen, pad_len = 0;
 162         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 163
 164         if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD)
 165                 pad_len = 2;
 166         len -= pad_len;
 167
 168         /* If frame is small enough to fit in skb->head, pull it completely.
 169          * If not, only pull ieee80211_hdr (including crypto if present, and
 170          * an additional 8 bytes for SNAP/ethertype, see below) so that
 171          * splice() or TCP coalesce are more efficient.
 172          *
 173          * Since, in addition, ieee80211_data_to_8023() always pull in at
 174          * least 8 bytes (possibly more for mesh) we can do the same here
 175          * to save the cost of doing it later. That still doesn't pull in
 176          * the actual IP header since the typical case has a SNAP header.
 177          * If the latter changes (there are efforts in the standards group
 178          * to do so) we should revisit this and ieee80211_data_to_8023().
 179          */
 180         headlen = (len <= skb_tailroom(skb)) ? len :
 181                                                hdrlen + crypt_len + 8;
 182
 183         /* The firmware may align the packet to DWORD.
 184          * The padding is inserted after the IV.
 185          * After copying the header + IV skip the padding if
 186          * present before copying packet data.
 187          */
 188         hdrlen += crypt_len;
 189         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 190         memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len,
 191                headlen - hdrlen);
 192
 193         fraglen = len - headlen;
 194
 195         if (fraglen) {
 196                 int offset = (void *)hdr + headlen + pad_len -
 197                              rxb_addr(rxb) + rxb_offset(rxb);
 198
 199                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 200                                 fraglen, rxb->truesize);
 201         }
 202 }
 203
 204 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
 205 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 206                                             struct napi_struct *napi,
 207                                             struct sk_buff *skb, int queue,
 208                                             struct ieee80211_sta *sta)
 209 {
 210         if (iwl_mvm_check_pn(mvm, skb, queue, sta))
 211                 kfree_skb(skb);
 212         else
 213                 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 214 }
 215
 216 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 217                                         struct iwl_rx_mpdu_desc *desc,
 218                                         struct ieee80211_rx_status *rx_status)
 219 {
 220         int energy_a, energy_b, max_energy;
 221
 222         energy_a = desc->energy_a;
 223         energy_a = energy_a ? -energy_a : S8_MIN;
 224         energy_b = desc->energy_b;
 225         energy_b = energy_b ? -energy_b : S8_MIN;
 226         max_energy = max(energy_a, energy_b);
 227
 228         IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
 229                         energy_a, energy_b, max_energy);
 230
 231         rx_status->signal = max_energy;
 232         rx_status->chains = 0; /* TODO: phy info */
 233         rx_status->chain_signal[0] = energy_a;
 234         rx_status->chain_signal[1] = energy_b;
 235         rx_status->chain_signal[2] = S8_MIN;
 236 }
 237
 238 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 239                              struct ieee80211_rx_status *stats,
 240                              struct iwl_rx_mpdu_desc *desc, int queue,
 241                              u8 *crypt_len)
 242 {
 243         u16 status = le16_to_cpu(desc->status);
 244
 245         if (!ieee80211_has_protected(hdr->frame_control) ||
 246             (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 247             IWL_RX_MPDU_STATUS_SEC_NONE)
 248                 return 0;
 249
 250         /* TODO: handle packets encrypted with unknown alg */
 251
 252         switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
 253         case IWL_RX_MPDU_STATUS_SEC_CCM:
 254         case IWL_RX_MPDU_STATUS_SEC_GCM:
 255                 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
 256                 /* alg is CCM: check MIC only */
 257                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 258                         return -1;
 259
 260                 stats->flag |= RX_FLAG_DECRYPTED;
 261                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 262                 return 0;
 263         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 264                 /* Don't drop the frame and decrypt it in SW */
 265                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 266                         return 0;
 267
 268                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 269                 /* fall through if TTAK OK */
 270         case IWL_RX_MPDU_STATUS_SEC_WEP:
 271                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 272                         return -1;
 273
 274                 stats->flag |= RX_FLAG_DECRYPTED;
 275                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 276                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 277                         *crypt_len = IEEE80211_WEP_IV_LEN;
 278                 return 0;
 279         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 280                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 281                         return -1;
 282                 stats->flag |= RX_FLAG_DECRYPTED;
 283                 return 0;
 284         default:
 285                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 286         }
 287
 288         return 0;
 289 }
 290
 291 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 292                             struct sk_buff *skb,
 293                             struct iwl_rx_mpdu_desc *desc)
 294 {
 295         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 296         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 297         u16 flags = le16_to_cpu(desc->l3l4_flags);
 298         u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
 299                           IWL_RX_L3_PROTO_POS);
 300
 301         if (mvmvif->features & NETIF_F_RXCSUM &&
 302             flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
 303             (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
 304              l3_prot == IWL_RX_L3_TYPE_IPV6 ||
 305              l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
 306                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 307 }
 308
 309 /*
 310  * returns true if a packet outside BA session is a duplicate and
 311  * should be dropped
 312  */
 313 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
 314                                   struct ieee80211_rx_status *rx_status,
 315                                   struct ieee80211_hdr *hdr,
 316                                   struct iwl_rx_mpdu_desc *desc)
 317 {
 318         struct iwl_mvm_sta *mvm_sta;
 319         struct iwl_mvm_rxq_dup_data *dup_data;
 320         u8 baid, tid, sub_frame_idx;
 321
 322         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 323                 return false;
 324
 325         baid = (le32_to_cpu(desc->reorder_data) &
 326                 IWL_RX_MPDU_REORDER_BAID_MASK) >>
 327                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 328
 329         if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 330                 return false;
 331
 332         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 333         dup_data = &mvm_sta->dup_data[queue];
 334
 335         /*
 336          * Drop duplicate 802.11 retransmissions
 337          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 338          */
 339         if (ieee80211_is_ctl(hdr->frame_control) ||
 340             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
 341             is_multicast_ether_addr(hdr->addr1)) {
 342                 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 343                 return false;
 344         }
 345
 346         if (ieee80211_is_data_qos(hdr->frame_control))
 347                 /* frame has qos control */
 348                 tid = *ieee80211_get_qos_ctl(hdr) &
 349                         IEEE80211_QOS_CTL_TID_MASK;
 350         else
 351                 tid = IWL_MAX_TID_COUNT;
 352
 353         /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
 354         sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 355
 356         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 357                      dup_data->last_seq[tid] == hdr->seq_ctrl &&
 358                      dup_data->last_sub_frame[tid] >= sub_frame_idx))
 359                 return true;
 360
 361         dup_data->last_seq[tid] = hdr->seq_ctrl;
 362         dup_data->last_sub_frame[tid] = sub_frame_idx;
 363
 364         rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 365
 366         return false;
 367 }
 368
 369 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 370                             const u8 *data, u32 count)
 371 {
 372         struct iwl_rxq_sync_cmd *cmd;
 373         u32 data_size = sizeof(*cmd) + count;
 374         int ret;
 375
 376         /* should be DWORD aligned */
 377         if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
 378                 return -EINVAL;
 379
 380         cmd = kzalloc(data_size, GFP_KERNEL);
 381         if (!cmd)
 382                 return -ENOMEM;
 383
 384         cmd->rxq_mask = cpu_to_le32(rxq_mask);
 385         cmd->count =  cpu_to_le32(count);
 386         cmd->flags = 0;
 387         memcpy(cmd->payload, data, count);
 388
 389         ret = iwl_mvm_send_cmd_pdu(mvm,
 390                                    WIDE_ID(DATA_PATH_GROUP,
 391                                            TRIGGER_RX_QUEUES_NOTIF_CMD),
 392                                    0, data_size, cmd);
 393
 394         kfree(cmd);
 395         return ret;
 396 }
 397
 398 /*
 399  * Returns true if sn2 - buffer_size < sn1 < sn2.
 400  * To be used only in order to compare reorder buffer head with NSSN.
 401  * We fully trust NSSN unless it is behind us due to reorder timeout.
 402  * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
 403  */
 404 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 405 {
 406         return ieee80211_sn_less(sn1, sn2) &&
 407                !ieee80211_sn_less(sn1, sn2 - buffer_size);
 408 }
 409
 410 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 411
 412 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 413                                    struct ieee80211_sta *sta,
 414                                    struct napi_struct *napi,
 415                                    struct iwl_mvm_reorder_buffer *reorder_buf,
 416                                    u16 nssn)
 417 {
 418         u16 ssn = reorder_buf->head_sn;
 419
 420         lockdep_assert_held(&reorder_buf->lock);
 421
 422         /* ignore nssn smaller than head sn - this can happen due to timeout */
 423         if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 424                 return;
 425
 426         while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
 427                 int index = ssn % reorder_buf->buf_size;
 428                 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
 429                 struct sk_buff *skb;
 430
 431                 ssn = ieee80211_sn_inc(ssn);
 432
 433                 /* holes are valid since nssn indicates frames were received. */
 434                 if (skb_queue_empty(skb_list) || !skb_peek_tail(skb_list))
 435                         continue;
 436                 /* Empty the list. Will have more than one frame for A-MSDU */
 437                 while ((skb = __skb_dequeue(skb_list))) {
 438                         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
 439                                                         reorder_buf->queue,
 440                                                         sta);
 441                         reorder_buf->num_stored--;
 442                 }
 443         }
 444         reorder_buf->head_sn = nssn;
 445
 446         if (reorder_buf->num_stored && !reorder_buf->removed) {
 447                 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
 448
 449                 while (!skb_peek_tail(&reorder_buf->entries[index]))
 450                         index = (index + 1) % reorder_buf->buf_size;
 451                 /* modify timer to match next frame's expiration time */
 452                 mod_timer(&reorder_buf->reorder_timer,
 453                           reorder_buf->reorder_time[index] + 1 +
 454                           RX_REORDER_BUF_TIMEOUT_MQ);
 455         } else {
 456                 del_timer(&reorder_buf->reorder_timer);
 457         }
 458 }
 459
 460 void iwl_mvm_reorder_timer_expired(unsigned long data)
 461 {
 462         struct iwl_mvm_reorder_buffer *buf = (void *)data;
 463         int i;
 464         u16 sn = 0, index = 0;
 465         bool expired = false;
 466
 467         spin_lock_bh(&buf->lock);
 468
 469         if (!buf->num_stored || buf->removed) {
 470                 spin_unlock_bh(&buf->lock);
 471                 return;
 472         }
 473
 474         for (i = 0; i < buf->buf_size ; i++) {
 475                 index = (buf->head_sn + i) % buf->buf_size;
 476
 477                 if (!skb_peek_tail(&buf->entries[index]))
 478                         continue;
 479                 if (!time_after(jiffies, buf->reorder_time[index] +
 480                                 RX_REORDER_BUF_TIMEOUT_MQ))
 481                         break;
 482                 expired = true;
 483                 sn = ieee80211_sn_add(buf->head_sn, i + 1);
 484         }
 485
 486         if (expired) {
 487                 struct ieee80211_sta *sta;
 488
 489                 rcu_read_lock();
 490                 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
 491                 /* SN is set to the last expired frame + 1 */
 492                 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
 493                 rcu_read_unlock();
 494         } else if (buf->num_stored) {
 495                 /*
 496                  * If no frame expired and there are stored frames, index is now
 497                  * pointing to the first unexpired frame - modify timer
 498                  * accordingly to this frame.
 499                  */
 500                 mod_timer(&buf->reorder_timer,
 501                           buf->reorder_time[index] +
 502                           1 + RX_REORDER_BUF_TIMEOUT_MQ);
 503         }
 504         spin_unlock_bh(&buf->lock);
 505 }
 506
 507 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 508                            struct iwl_mvm_delba_data *data)
 509 {
 510         struct iwl_mvm_baid_data *ba_data;
 511         struct ieee80211_sta *sta;
 512         struct iwl_mvm_reorder_buffer *reorder_buf;
 513         u8 baid = data->baid;
 514
 515         if (WARN_ON_ONCE(baid >= IWL_RX_REORDER_DATA_INVALID_BAID))
 516                 return;
 517
 518         rcu_read_lock();
 519
 520         ba_data = rcu_dereference(mvm->baid_map[baid]);
 521         if (WARN_ON_ONCE(!ba_data))
 522                 goto out;
 523
 524         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 525         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 526                 goto out;
 527
 528         reorder_buf = &ba_data->reorder_buf[queue];
 529
 530         /* release all frames that are in the reorder buffer to the stack */
 531         spin_lock_bh(&reorder_buf->lock);
 532         iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
 533                                ieee80211_sn_add(reorder_buf->head_sn,
 534                                                 reorder_buf->buf_size));
 535         spin_unlock_bh(&reorder_buf->lock);
 536         del_timer_sync(&reorder_buf->reorder_timer);
 537
 538 out:
 539         rcu_read_unlock();
 540 }
 541
 542 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 543                             int queue)
 544 {
 545         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 546         struct iwl_rxq_sync_notification *notif;
 547         struct iwl_mvm_internal_rxq_notif *internal_notif;
 548
 549         notif = (void *)pkt->data;
 550         internal_notif = (void *)notif->payload;
 551
 552         if (internal_notif->sync) {
 553                 if (mvm->queue_sync_cookie != internal_notif->cookie) {
 554                         WARN_ONCE(1,
 555                                   "Received expired RX queue sync message\n");
 556                         return;
 557                 }
 558                 atomic_dec(&mvm->queue_sync_counter);
 559         }
 560
 561         switch (internal_notif->type) {
 562         case IWL_MVM_RXQ_EMPTY:
 563                 break;
 564         case IWL_MVM_RXQ_NOTIF_DEL_BA:
 565                 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 566                 break;
 567         default:
 568                 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 569         }
 570 }
 571
 572 /*
 573  * Returns true if the MPDU was buffered\dropped, false if it should be passed
 574  * to upper layer.
 575  */
 576 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 577                             struct napi_struct *napi,
 578                             int queue,
 579                             struct ieee80211_sta *sta,
 580                             struct sk_buff *skb,
 581                             struct iwl_rx_mpdu_desc *desc)
 582 {
 583         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 584         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 585         struct iwl_mvm_baid_data *baid_data;
 586         struct iwl_mvm_reorder_buffer *buffer;
 587         struct sk_buff *tail;
 588         u32 reorder = le32_to_cpu(desc->reorder_data);
 589         bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
 590         u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 591         u8 sub_frame_idx = desc->amsdu_info &
 592                            IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 593         int index;
 594         u16 nssn, sn;
 595         u8 baid;
 596
 597         baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
 598                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 599
 600         if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
 601                 return false;
 602
 603         /* no sta yet */
 604         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 605                 return false;
 606
 607         /* not a data packet */
 608         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 609             is_multicast_ether_addr(hdr->addr1))
 610                 return false;
 611
 612         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 613                 return false;
 614
 615         baid_data = rcu_dereference(mvm->baid_map[baid]);
 616         if (WARN(!baid_data,
 617                  "Received baid %d, but no data exists for this BAID\n", baid))
 618                 return false;
 619         if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
 620                  "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
 621                  baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
 622                  tid))
 623                 return false;
 624
 625         nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
 626         sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
 627                 IWL_RX_MPDU_REORDER_SN_SHIFT;
 628
 629         buffer = &baid_data->reorder_buf[queue];
 630
 631         spin_lock_bh(&buffer->lock);
 632
 633         /*
 634          * If there was a significant jump in the nssn - adjust.
 635          * If the SN is smaller than the NSSN it might need to first go into
 636          * the reorder buffer, in which case we just release up to it and the
 637          * rest of the function will take of storing it and releasing up to the
 638          * nssn
 639          */
 640         if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 641                                 buffer->buf_size)) {
 642                 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 643
 644                 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
 645         }
 646
 647         /* drop any oudated packets */
 648         if (ieee80211_sn_less(sn, buffer->head_sn))
 649                 goto drop;
 650
 651         /* release immediately if allowed by nssn and no stored frames */
 652         if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 653                 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 654                                        buffer->buf_size))
 655                         buffer->head_sn = nssn;
 656                 /* No need to update AMSDU last SN - we are moving the head */
 657                 spin_unlock_bh(&buffer->lock);
 658                 return false;
 659         }
 660
 661         index = sn % buffer->buf_size;
 662
 663         /*
 664          * Check if we already stored this frame
 665          * As AMSDU is either received or not as whole, logic is simple:
 666          * If we have frames in that position in the buffer and the last frame
 667          * originated from AMSDU had a different SN then it is a retransmission.
 668          * If it is the same SN then if the subframe index is incrementing it
 669          * is the same AMSDU - otherwise it is a retransmission.
 670          */
 671         tail = skb_peek_tail(&buffer->entries[index]);
 672         if (tail && !amsdu)
 673                 goto drop;
 674         else if (tail && (sn != buffer->last_amsdu ||
 675                           buffer->last_sub_index >= sub_frame_idx))
 676                 goto drop;
 677
 678         /* put in reorder buffer */
 679         __skb_queue_tail(&buffer->entries[index], skb);
 680         buffer->num_stored++;
 681         buffer->reorder_time[index] = jiffies;
 682
 683         if (amsdu) {
 684                 buffer->last_amsdu = sn;
 685                 buffer->last_sub_index = sub_frame_idx;
 686         }
 687
 688         iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 689         spin_unlock_bh(&buffer->lock);
 690         return true;
 691
 692 drop:
 693         kfree_skb(skb);
 694         spin_unlock_bh(&buffer->lock);
 695         return true;
 696 }
 697
 698 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid)
 699 {
 700         unsigned long now = jiffies;
 701         unsigned long timeout;
 702         struct iwl_mvm_baid_data *data;
 703
 704         rcu_read_lock();
 705
 706         data = rcu_dereference(mvm->baid_map[baid]);
 707         if (WARN_ON(!data))
 708                 goto out;
 709
 710         if (!data->timeout)
 711                 goto out;
 712
 713         timeout = data->timeout;
 714         /*
 715          * Do not update last rx all the time to avoid cache bouncing
 716          * between the rx queues.
 717          * Update it every timeout. Worst case is the session will
 718          * expire after ~ 2 * timeout, which doesn't matter that much.
 719          */
 720         if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
 721                 /* Update is atomic */
 722                 data->last_rx = now;
 723
 724 out:
 725         rcu_read_unlock();
 726 }
 727
 728 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 729                         struct iwl_rx_cmd_buffer *rxb, int queue)
 730 {
 731         struct ieee80211_rx_status *rx_status;
 732         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 733         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 734         struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 735         u32 len = le16_to_cpu(desc->mpdu_len);
 736         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 737         struct ieee80211_sta *sta = NULL;
 738         struct sk_buff *skb;
 739         u8 crypt_len = 0;
 740
 741         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 742          * ieee80211_hdr pulled.
 743          */
 744         skb = alloc_skb(128, GFP_ATOMIC);
 745         if (!skb) {
 746                 IWL_ERR(mvm, "alloc_skb failed\n");
 747                 return;
 748         }
 749
 750         rx_status = IEEE80211_SKB_RXCB(skb);
 751
 752         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 753                 kfree_skb(skb);
 754                 return;
 755         }
 756
 757         /*
 758          * Keep packets with CRC errors (and with overrun) for monitor mode
 759          * (otherwise the firmware discards them) but mark them as bad.
 760          */
 761         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 762             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 763                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 764                              le16_to_cpu(desc->status));
 765                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 766         }
 767
 768         rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 769         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 770         rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
 771                                                NL80211_BAND_2GHZ;
 772         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 773                                                          rx_status->band);
 774         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 775         /* TSF as indicated by the firmware is at INA time */
 776         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 777
 778         rcu_read_lock();
 779
 780         if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
 781                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 782
 783                 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
 784                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 785                         if (IS_ERR(sta))
 786                                 sta = NULL;
 787                 }
 788         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 789                 /*
 790                  * This is fine since we prevent two stations with the same
 791                  * address from being added.
 792                  */
 793                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 794         }
 795
 796         if (sta) {
 797                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 798                 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
 799                                IWL_RX_MPDU_REORDER_BAID_MASK) >>
 800                                IWL_RX_MPDU_REORDER_BAID_SHIFT);
 801
 802                 /*
 803                  * We have tx blocked stations (with CS bit). If we heard
 804                  * frames from a blocked station on a new channel we can
 805                  * TX to it again.
 806                  */
 807                 if (unlikely(mvm->csa_tx_block_bcn_timeout))
 808                         iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
 809
 810                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 811
 812                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 813                     ieee80211_is_beacon(hdr->frame_control)) {
 814                         struct iwl_fw_dbg_trigger_tlv *trig;
 815                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 816                         bool trig_check;
 817                         s32 rssi;
 818
 819                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 820                                                       FW_DBG_TRIGGER_RSSI);
 821                         rssi_trig = (void *)trig->data;
 822                         rssi = le32_to_cpu(rssi_trig->rssi);
 823
 824                         trig_check =
 825                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 826                                                               trig);
 827                         if (trig_check && rx_status->signal < rssi)
 828                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 829                 }
 830
 831                 /* TODO: multi queue TCM */
 832
 833                 if (ieee80211_is_data(hdr->frame_control))
 834                         iwl_mvm_rx_csum(sta, skb, desc);
 835
 836                 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
 837                         kfree_skb(skb);
 838                         rcu_read_unlock();
 839                         return;
 840                 }
 841
 842                 /*
 843                  * Our hardware de-aggregates AMSDUs but copies the mac header
 844                  * as it to the de-aggregated MPDUs. We need to turn off the
 845                  * AMSDU bit in the QoS control ourselves.
 846                  */
 847                 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
 848                     !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
 849                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 850
 851                         *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 852                 }
 853                 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 854                         iwl_mvm_agg_rx_received(mvm, baid);
 855         }
 856
 857         /*
 858          * TODO: PHY info.
 859          * Verify we don't have the information in the MPDU descriptor and
 860          * that it is not needed.
 861          * Make sure for monitor mode that we are on default queue, update
 862          * ampdu_ref and the rest of phy info then
 863          */
 864
 865         /* Set up the HT phy flags */
 866         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 867         case RATE_MCS_CHAN_WIDTH_20:
 868                 break;
 869         case RATE_MCS_CHAN_WIDTH_40:
 870                 rx_status->flag |= RX_FLAG_40MHZ;
 871                 break;
 872         case RATE_MCS_CHAN_WIDTH_80:
 873                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 874                 break;
 875         case RATE_MCS_CHAN_WIDTH_160:
 876                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 877                 break;
 878         }
 879         if (rate_n_flags & RATE_MCS_SGI_MSK)
 880                 rx_status->flag |= RX_FLAG_SHORT_GI;
 881         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 882                 rx_status->flag |= RX_FLAG_HT_GF;
 883         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 884                 rx_status->flag |= RX_FLAG_LDPC;
 885         if (rate_n_flags & RATE_MCS_HT_MSK) {
 886                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 887                                 RATE_MCS_STBC_POS;
 888                 rx_status->flag |= RX_FLAG_HT;
 889                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 890                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 891         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 892                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 893                                 RATE_MCS_STBC_POS;
 894                 rx_status->vht_nss =
 895                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 896                                                 RATE_VHT_MCS_NSS_POS) + 1;
 897                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 898                 rx_status->flag |= RX_FLAG_VHT;
 899                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 900                 if (rate_n_flags & RATE_MCS_BF_MSK)
 901                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 902         } else {
 903                 rx_status->rate_idx =
 904                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 905                                                             rx_status->band);
 906         }
 907
 908         /* TODO: PHY info - update ampdu queue statistics (for debugfs) */
 909         /* TODO: PHY info - gscan */
 910
 911         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
 912         if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
 913                 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
 914         rcu_read_unlock();
 915 }
 916
 917 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 918                               struct iwl_rx_cmd_buffer *rxb, int queue)
 919 {
 920         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 921         struct iwl_frame_release *release = (void *)pkt->data;
 922         struct ieee80211_sta *sta;
 923         struct iwl_mvm_reorder_buffer *reorder_buf;
 924         struct iwl_mvm_baid_data *ba_data;
 925
 926         int baid = release->baid;
 927
 928         if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
 929                 return;
 930
 931         rcu_read_lock();
 932
 933         ba_data = rcu_dereference(mvm->baid_map[baid]);
 934         if (WARN_ON_ONCE(!ba_data))
 935                 goto out;
 936
 937         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 938         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 939                 goto out;
 940
 941         reorder_buf = &ba_data->reorder_buf[queue];
 942
 943         spin_lock_bh(&reorder_buf->lock);
 944         iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
 945                                le16_to_cpu(release->nssn));
 946         spin_unlock_bh(&reorder_buf->lock);
 947
 948 out:
 949         rcu_read_unlock();
 950 }