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 - 2017 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.
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  24  * Contact Information:
  25  *  Intel Linux Wireless <[email protected]>
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  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 - 2017 Intel Deutschland GmbH
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  36  * modification, are permitted provided that the following conditions
  37  * are met:
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  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
  67 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
  68                                    int queue, struct ieee80211_sta *sta)
  69 {
  70         struct iwl_mvm_sta *mvmsta;
  71         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  72         struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
  73         struct iwl_mvm_key_pn *ptk_pn;
  74         u8 tid, keyidx;
  75         u8 pn[IEEE80211_CCMP_PN_LEN];
  76         u8 *extiv;
  77
  78         /* do PN checking */
  79
  80         /* multicast and non-data only arrives on default queue */
  81         if (!ieee80211_is_data(hdr->frame_control) ||
  82             is_multicast_ether_addr(hdr->addr1))
  83                 return 0;
  84
  85         /* do not check PN for open AP */
  86         if (!(stats->flag & RX_FLAG_DECRYPTED))
  87                 return 0;
  88
  89         /*
  90          * avoid checking for default queue - we don't want to replicate
  91          * all the logic that's necessary for checking the PN on fragmented
  92          * frames, leave that to mac80211
  93          */
  94         if (queue == 0)
  95                 return 0;
  96
  97         /* if we are here - this for sure is either CCMP or GCMP */
  98         if (IS_ERR_OR_NULL(sta)) {
  99                 IWL_ERR(mvm,
 100                         "expected hw-decrypted unicast frame for station\n");
 101                 return -1;
 102         }
 103
 104         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 105
 106         extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
 107         keyidx = extiv[3] >> 6;
 108
 109         ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
 110         if (!ptk_pn)
 111                 return -1;
 112
 113         if (ieee80211_is_data_qos(hdr->frame_control))
 114                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 115         else
 116                 tid = 0;
 117
 118         /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
 119         if (tid >= IWL_MAX_TID_COUNT)
 120                 return -1;
 121
 122         /* load pn */
 123         pn[0] = extiv[7];
 124         pn[1] = extiv[6];
 125         pn[2] = extiv[5];
 126         pn[3] = extiv[4];
 127         pn[4] = extiv[1];
 128         pn[5] = extiv[0];
 129
 130         if (memcmp(pn, ptk_pn->q[queue].pn[tid],
 131                    IEEE80211_CCMP_PN_LEN) <= 0)
 132                 return -1;
 133
 134         if (!(stats->flag & RX_FLAG_AMSDU_MORE))
 135                 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
 136         stats->flag |= RX_FLAG_PN_VALIDATED;
 137
 138         return 0;
 139 }
 140
 141 /* iwl_mvm_create_skb Adds the rxb to a new skb */
 142 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
 143                                u16 len, u8 crypt_len,
 144                                struct iwl_rx_cmd_buffer *rxb)
 145 {
 146         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 147         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 148         unsigned int headlen, fraglen, pad_len = 0;
 149         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 150
 151         if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) {
 152                 pad_len = 2;
 153
 154                 /*
 155                  * If the device inserted padding it means that (it thought)
 156                  * the 802.11 header wasn't a multiple of 4 bytes long. In
 157                  * this case, reserve two bytes at the start of the SKB to
 158                  * align the payload properly in case we end up copying it.
 159                  */
 160                 skb_reserve(skb, pad_len);
 161         }
 162         len -= pad_len;
 163
 164         /* If frame is small enough to fit in skb->head, pull it completely.
 165          * If not, only pull ieee80211_hdr (including crypto if present, and
 166          * an additional 8 bytes for SNAP/ethertype, see below) so that
 167          * splice() or TCP coalesce are more efficient.
 168          *
 169          * Since, in addition, ieee80211_data_to_8023() always pull in at
 170          * least 8 bytes (possibly more for mesh) we can do the same here
 171          * to save the cost of doing it later. That still doesn't pull in
 172          * the actual IP header since the typical case has a SNAP header.
 173          * If the latter changes (there are efforts in the standards group
 174          * to do so) we should revisit this and ieee80211_data_to_8023().
 175          */
 176         headlen = (len <= skb_tailroom(skb)) ? len :
 177                                                hdrlen + crypt_len + 8;
 178
 179         /* The firmware may align the packet to DWORD.
 180          * The padding is inserted after the IV.
 181          * After copying the header + IV skip the padding if
 182          * present before copying packet data.
 183          */
 184         hdrlen += crypt_len;
 185         skb_put_data(skb, hdr, hdrlen);
 186         skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen);
 187
 188         fraglen = len - headlen;
 189
 190         if (fraglen) {
 191                 int offset = (void *)hdr + headlen + pad_len -
 192                              rxb_addr(rxb) + rxb_offset(rxb);
 193
 194                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 195                                 fraglen, rxb->truesize);
 196         }
 197 }
 198
 199 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
 200 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 201                                             struct napi_struct *napi,
 202                                             struct sk_buff *skb, int queue,
 203                                             struct ieee80211_sta *sta)
 204 {
 205         if (iwl_mvm_check_pn(mvm, skb, queue, sta))
 206                 kfree_skb(skb);
 207         else
 208                 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 209 }
 210
 211 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 212                                         struct iwl_rx_mpdu_desc *desc,
 213                                         struct ieee80211_rx_status *rx_status)
 214 {
 215         int energy_a, energy_b, max_energy;
 216
 217         energy_a = desc->energy_a;
 218         energy_a = energy_a ? -energy_a : S8_MIN;
 219         energy_b = desc->energy_b;
 220         energy_b = energy_b ? -energy_b : S8_MIN;
 221         max_energy = max(energy_a, energy_b);
 222
 223         IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
 224                         energy_a, energy_b, max_energy);
 225
 226         rx_status->signal = max_energy;
 227         rx_status->chains = 0; /* TODO: phy info */
 228         rx_status->chain_signal[0] = energy_a;
 229         rx_status->chain_signal[1] = energy_b;
 230         rx_status->chain_signal[2] = S8_MIN;
 231 }
 232
 233 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 234                              struct ieee80211_rx_status *stats,
 235                              struct iwl_rx_mpdu_desc *desc, int queue,
 236                              u8 *crypt_len)
 237 {
 238         u16 status = le16_to_cpu(desc->status);
 239
 240         if (!ieee80211_has_protected(hdr->frame_control) ||
 241             (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 242             IWL_RX_MPDU_STATUS_SEC_NONE)
 243                 return 0;
 244
 245         /* TODO: handle packets encrypted with unknown alg */
 246
 247         switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
 248         case IWL_RX_MPDU_STATUS_SEC_CCM:
 249         case IWL_RX_MPDU_STATUS_SEC_GCM:
 250                 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
 251                 /* alg is CCM: check MIC only */
 252                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 253                         return -1;
 254
 255                 stats->flag |= RX_FLAG_DECRYPTED;
 256                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 257                 return 0;
 258         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 259                 /* Don't drop the frame and decrypt it in SW */
 260                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 261                         return 0;
 262
 263                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 264                 /* fall through if TTAK OK */
 265         case IWL_RX_MPDU_STATUS_SEC_WEP:
 266                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 267                         return -1;
 268
 269                 stats->flag |= RX_FLAG_DECRYPTED;
 270                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 271                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 272                         *crypt_len = IEEE80211_WEP_IV_LEN;
 273                 return 0;
 274         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 275                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 276                         return -1;
 277                 stats->flag |= RX_FLAG_DECRYPTED;
 278                 return 0;
 279         default:
 280                 /* Expected in monitor (not having the keys) */
 281                 if (!mvm->monitor_on)
 282                         IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 283         }
 284
 285         return 0;
 286 }
 287
 288 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 289                             struct sk_buff *skb,
 290                             struct iwl_rx_mpdu_desc *desc)
 291 {
 292         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 293         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 294         u16 flags = le16_to_cpu(desc->l3l4_flags);
 295         u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
 296                           IWL_RX_L3_PROTO_POS);
 297
 298         if (mvmvif->features & NETIF_F_RXCSUM &&
 299             flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
 300             (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
 301              l3_prot == IWL_RX_L3_TYPE_IPV6 ||
 302              l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
 303                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 304 }
 305
 306 /*
 307  * returns true if a packet outside BA session is a duplicate and
 308  * should be dropped
 309  */
 310 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
 311                                   struct ieee80211_rx_status *rx_status,
 312                                   struct ieee80211_hdr *hdr,
 313                                   struct iwl_rx_mpdu_desc *desc)
 314 {
 315         struct iwl_mvm_sta *mvm_sta;
 316         struct iwl_mvm_rxq_dup_data *dup_data;
 317         u8 baid, tid, sub_frame_idx;
 318
 319         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 320                 return false;
 321
 322         baid = (le32_to_cpu(desc->reorder_data) &
 323                 IWL_RX_MPDU_REORDER_BAID_MASK) >>
 324                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 325
 326         if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 327                 return false;
 328
 329         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 330         dup_data = &mvm_sta->dup_data[queue];
 331
 332         /*
 333          * Drop duplicate 802.11 retransmissions
 334          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 335          */
 336         if (ieee80211_is_ctl(hdr->frame_control) ||
 337             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
 338             is_multicast_ether_addr(hdr->addr1)) {
 339                 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 340                 return false;
 341         }
 342
 343         if (ieee80211_is_data_qos(hdr->frame_control))
 344                 /* frame has qos control */
 345                 tid = *ieee80211_get_qos_ctl(hdr) &
 346                         IEEE80211_QOS_CTL_TID_MASK;
 347         else
 348                 tid = IWL_MAX_TID_COUNT;
 349
 350         /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
 351         sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 352
 353         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 354                      dup_data->last_seq[tid] == hdr->seq_ctrl &&
 355                      dup_data->last_sub_frame[tid] >= sub_frame_idx))
 356                 return true;
 357
 358         dup_data->last_seq[tid] = hdr->seq_ctrl;
 359         dup_data->last_sub_frame[tid] = sub_frame_idx;
 360
 361         rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 362
 363         return false;
 364 }
 365
 366 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 367                             const u8 *data, u32 count)
 368 {
 369         struct iwl_rxq_sync_cmd *cmd;
 370         u32 data_size = sizeof(*cmd) + count;
 371         int ret;
 372
 373         /* should be DWORD aligned */
 374         if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
 375                 return -EINVAL;
 376
 377         cmd = kzalloc(data_size, GFP_KERNEL);
 378         if (!cmd)
 379                 return -ENOMEM;
 380
 381         cmd->rxq_mask = cpu_to_le32(rxq_mask);
 382         cmd->count =  cpu_to_le32(count);
 383         cmd->flags = 0;
 384         memcpy(cmd->payload, data, count);
 385
 386         ret = iwl_mvm_send_cmd_pdu(mvm,
 387                                    WIDE_ID(DATA_PATH_GROUP,
 388                                            TRIGGER_RX_QUEUES_NOTIF_CMD),
 389                                    0, data_size, cmd);
 390
 391         kfree(cmd);
 392         return ret;
 393 }
 394
 395 /*
 396  * Returns true if sn2 - buffer_size < sn1 < sn2.
 397  * To be used only in order to compare reorder buffer head with NSSN.
 398  * We fully trust NSSN unless it is behind us due to reorder timeout.
 399  * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
 400  */
 401 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 402 {
 403         return ieee80211_sn_less(sn1, sn2) &&
 404                !ieee80211_sn_less(sn1, sn2 - buffer_size);
 405 }
 406
 407 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 408
 409 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 410                                    struct ieee80211_sta *sta,
 411                                    struct napi_struct *napi,
 412                                    struct iwl_mvm_reorder_buffer *reorder_buf,
 413                                    u16 nssn)
 414 {
 415         u16 ssn = reorder_buf->head_sn;
 416
 417         lockdep_assert_held(&reorder_buf->lock);
 418
 419         /* ignore nssn smaller than head sn - this can happen due to timeout */
 420         if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 421                 goto set_timer;
 422
 423         while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
 424                 int index = ssn % reorder_buf->buf_size;
 425                 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
 426                 struct sk_buff *skb;
 427
 428                 ssn = ieee80211_sn_inc(ssn);
 429
 430                 /*
 431                  * Empty the list. Will have more than one frame for A-MSDU.
 432                  * Empty list is valid as well since nssn indicates frames were
 433                  * received.
 434                  */
 435                 while ((skb = __skb_dequeue(skb_list))) {
 436                         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
 437                                                         reorder_buf->queue,
 438                                                         sta);
 439                         reorder_buf->num_stored--;
 440                 }
 441         }
 442         reorder_buf->head_sn = nssn;
 443
 444 set_timer:
 445         if (reorder_buf->num_stored && !reorder_buf->removed) {
 446                 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
 447
 448                 while (skb_queue_empty(&reorder_buf->entries[index]))
 449                         index = (index + 1) % reorder_buf->buf_size;
 450                 /* modify timer to match next frame's expiration time */
 451                 mod_timer(&reorder_buf->reorder_timer,
 452                           reorder_buf->reorder_time[index] + 1 +
 453                           RX_REORDER_BUF_TIMEOUT_MQ);
 454         } else {
 455                 del_timer(&reorder_buf->reorder_timer);
 456         }
 457 }
 458
 459 void iwl_mvm_reorder_timer_expired(unsigned long data)
 460 {
 461         struct iwl_mvm_reorder_buffer *buf = (void *)data;
 462         int i;
 463         u16 sn = 0, index = 0;
 464         bool expired = false;
 465         bool cont = false;
 466
 467         spin_lock(&buf->lock);
 468
 469         if (!buf->num_stored || buf->removed) {
 470                 spin_unlock(&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_queue_empty(&buf->entries[index])) {
 478                         /*
 479                          * If there is a hole and the next frame didn't expire
 480                          * we want to break and not advance SN
 481                          */
 482                         cont = false;
 483                         continue;
 484                 }
 485                 if (!cont && !time_after(jiffies, buf->reorder_time[index] +
 486                                          RX_REORDER_BUF_TIMEOUT_MQ))
 487                         break;
 488
 489                 expired = true;
 490                 /* continue until next hole after this expired frames */
 491                 cont = true;
 492                 sn = ieee80211_sn_add(buf->head_sn, i + 1);
 493         }
 494
 495         if (expired) {
 496                 struct ieee80211_sta *sta;
 497
 498                 rcu_read_lock();
 499                 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
 500                 /* SN is set to the last expired frame + 1 */
 501                 IWL_DEBUG_HT(buf->mvm,
 502                              "Releasing expired frames for sta %u, sn %d\n",
 503                              buf->sta_id, sn);
 504                 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
 505                 rcu_read_unlock();
 506         } else {
 507                 /*
 508                  * If no frame expired and there are stored frames, index is now
 509                  * pointing to the first unexpired frame - modify timer
 510                  * accordingly to this frame.
 511                  */
 512                 mod_timer(&buf->reorder_timer,
 513                           buf->reorder_time[index] +
 514                           1 + RX_REORDER_BUF_TIMEOUT_MQ);
 515         }
 516         spin_unlock(&buf->lock);
 517 }
 518
 519 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 520                            struct iwl_mvm_delba_data *data)
 521 {
 522         struct iwl_mvm_baid_data *ba_data;
 523         struct ieee80211_sta *sta;
 524         struct iwl_mvm_reorder_buffer *reorder_buf;
 525         u8 baid = data->baid;
 526
 527         if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
 528                 return;
 529
 530         rcu_read_lock();
 531
 532         ba_data = rcu_dereference(mvm->baid_map[baid]);
 533         if (WARN_ON_ONCE(!ba_data))
 534                 goto out;
 535
 536         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 537         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 538                 goto out;
 539
 540         reorder_buf = &ba_data->reorder_buf[queue];
 541
 542         /* release all frames that are in the reorder buffer to the stack */
 543         spin_lock_bh(&reorder_buf->lock);
 544         iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
 545                                ieee80211_sn_add(reorder_buf->head_sn,
 546                                                 reorder_buf->buf_size));
 547         spin_unlock_bh(&reorder_buf->lock);
 548         del_timer_sync(&reorder_buf->reorder_timer);
 549
 550 out:
 551         rcu_read_unlock();
 552 }
 553
 554 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 555                             int queue)
 556 {
 557         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 558         struct iwl_rxq_sync_notification *notif;
 559         struct iwl_mvm_internal_rxq_notif *internal_notif;
 560
 561         notif = (void *)pkt->data;
 562         internal_notif = (void *)notif->payload;
 563
 564         if (internal_notif->sync) {
 565                 if (mvm->queue_sync_cookie != internal_notif->cookie) {
 566                         WARN_ONCE(1,
 567                                   "Received expired RX queue sync message\n");
 568                         return;
 569                 }
 570                 if (!atomic_dec_return(&mvm->queue_sync_counter))
 571                         wake_up(&mvm->rx_sync_waitq);
 572         }
 573
 574         switch (internal_notif->type) {
 575         case IWL_MVM_RXQ_EMPTY:
 576                 break;
 577         case IWL_MVM_RXQ_NOTIF_DEL_BA:
 578                 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 579                 break;
 580         default:
 581                 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 582         }
 583 }
 584
 585 /*
 586  * Returns true if the MPDU was buffered\dropped, false if it should be passed
 587  * to upper layer.
 588  */
 589 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 590                             struct napi_struct *napi,
 591                             int queue,
 592                             struct ieee80211_sta *sta,
 593                             struct sk_buff *skb,
 594                             struct iwl_rx_mpdu_desc *desc)
 595 {
 596         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 597         struct iwl_mvm_sta *mvm_sta;
 598         struct iwl_mvm_baid_data *baid_data;
 599         struct iwl_mvm_reorder_buffer *buffer;
 600         struct sk_buff *tail;
 601         u32 reorder = le32_to_cpu(desc->reorder_data);
 602         bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
 603         bool last_subframe =
 604                 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
 605         u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 606         u8 sub_frame_idx = desc->amsdu_info &
 607                            IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 608         int index;
 609         u16 nssn, sn;
 610         u8 baid;
 611
 612         baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
 613                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 614
 615         /*
 616          * This also covers the case of receiving a Block Ack Request
 617          * outside a BA session; we'll pass it to mac80211 and that
 618          * then sends a delBA action frame.
 619          */
 620         if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
 621                 return false;
 622
 623         /* no sta yet */
 624         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 625                 return false;
 626
 627         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 628
 629         /* not a data packet or a bar */
 630         if (!ieee80211_is_back_req(hdr->frame_control) &&
 631             (!ieee80211_is_data_qos(hdr->frame_control) ||
 632              is_multicast_ether_addr(hdr->addr1)))
 633                 return false;
 634
 635         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 636                 return false;
 637
 638         baid_data = rcu_dereference(mvm->baid_map[baid]);
 639         if (!baid_data) {
 640                 IWL_DEBUG_RX(mvm,
 641                              "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
 642                               baid, reorder);
 643                 return false;
 644         }
 645
 646         if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
 647                  "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
 648                  baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
 649                  tid))
 650                 return false;
 651
 652         nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
 653         sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
 654                 IWL_RX_MPDU_REORDER_SN_SHIFT;
 655
 656         buffer = &baid_data->reorder_buf[queue];
 657
 658         spin_lock_bh(&buffer->lock);
 659
 660         if (!buffer->valid) {
 661                 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) {
 662                         spin_unlock_bh(&buffer->lock);
 663                         return false;
 664                 }
 665                 buffer->valid = true;
 666         }
 667
 668         if (ieee80211_is_back_req(hdr->frame_control)) {
 669                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 670                 goto drop;
 671         }
 672
 673         /*
 674          * If there was a significant jump in the nssn - adjust.
 675          * If the SN is smaller than the NSSN it might need to first go into
 676          * the reorder buffer, in which case we just release up to it and the
 677          * rest of the function will take care of storing it and releasing up to
 678          * the nssn
 679          */
 680         if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 681                                 buffer->buf_size) ||
 682             !ieee80211_sn_less(sn, buffer->head_sn + buffer->buf_size)) {
 683                 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 684
 685                 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
 686         }
 687
 688         /* drop any oudated packets */
 689         if (ieee80211_sn_less(sn, buffer->head_sn))
 690                 goto drop;
 691
 692         /* release immediately if allowed by nssn and no stored frames */
 693         if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 694                 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 695                                        buffer->buf_size) &&
 696                    (!amsdu || last_subframe))
 697                         buffer->head_sn = nssn;
 698                 /* No need to update AMSDU last SN - we are moving the head */
 699                 spin_unlock_bh(&buffer->lock);
 700                 return false;
 701         }
 702
 703         index = sn % buffer->buf_size;
 704
 705         /*
 706          * Check if we already stored this frame
 707          * As AMSDU is either received or not as whole, logic is simple:
 708          * If we have frames in that position in the buffer and the last frame
 709          * originated from AMSDU had a different SN then it is a retransmission.
 710          * If it is the same SN then if the subframe index is incrementing it
 711          * is the same AMSDU - otherwise it is a retransmission.
 712          */
 713         tail = skb_peek_tail(&buffer->entries[index]);
 714         if (tail && !amsdu)
 715                 goto drop;
 716         else if (tail && (sn != buffer->last_amsdu ||
 717                           buffer->last_sub_index >= sub_frame_idx))
 718                 goto drop;
 719
 720         /* put in reorder buffer */
 721         __skb_queue_tail(&buffer->entries[index], skb);
 722         buffer->num_stored++;
 723         buffer->reorder_time[index] = jiffies;
 724
 725         if (amsdu) {
 726                 buffer->last_amsdu = sn;
 727                 buffer->last_sub_index = sub_frame_idx;
 728         }
 729
 730         /*
 731          * We cannot trust NSSN for AMSDU sub-frames that are not the last.
 732          * The reason is that NSSN advances on the first sub-frame, and may
 733          * cause the reorder buffer to advance before all the sub-frames arrive.
 734          * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
 735          * SN 1. NSSN for first sub frame will be 3 with the result of driver
 736          * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
 737          * already ahead and it will be dropped.
 738          * If the last sub-frame is not on this queue - we will get frame
 739          * release notification with up to date NSSN.
 740          */
 741         if (!amsdu || last_subframe)
 742                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 743
 744         spin_unlock_bh(&buffer->lock);
 745         return true;
 746
 747 drop:
 748         kfree_skb(skb);
 749         spin_unlock_bh(&buffer->lock);
 750         return true;
 751 }
 752
 753 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm,
 754                                     u32 reorder_data, u8 baid)
 755 {
 756         unsigned long now = jiffies;
 757         unsigned long timeout;
 758         struct iwl_mvm_baid_data *data;
 759
 760         rcu_read_lock();
 761
 762         data = rcu_dereference(mvm->baid_map[baid]);
 763         if (!data) {
 764                 IWL_DEBUG_RX(mvm,
 765                              "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
 766                               baid, reorder_data);
 767                 goto out;
 768         }
 769
 770         if (!data->timeout)
 771                 goto out;
 772
 773         timeout = data->timeout;
 774         /*
 775          * Do not update last rx all the time to avoid cache bouncing
 776          * between the rx queues.
 777          * Update it every timeout. Worst case is the session will
 778          * expire after ~ 2 * timeout, which doesn't matter that much.
 779          */
 780         if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
 781                 /* Update is atomic */
 782                 data->last_rx = now;
 783
 784 out:
 785         rcu_read_unlock();
 786 }
 787
 788 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 789                         struct iwl_rx_cmd_buffer *rxb, int queue)
 790 {
 791         struct ieee80211_rx_status *rx_status;
 792         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 793         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 794         struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 795         u32 len = le16_to_cpu(desc->mpdu_len);
 796         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 797         u16 phy_info = le16_to_cpu(desc->phy_info);
 798         struct ieee80211_sta *sta = NULL;
 799         struct sk_buff *skb;
 800         u8 crypt_len = 0;
 801
 802         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 803          * ieee80211_hdr pulled.
 804          */
 805         skb = alloc_skb(128, GFP_ATOMIC);
 806         if (!skb) {
 807                 IWL_ERR(mvm, "alloc_skb failed\n");
 808                 return;
 809         }
 810
 811         rx_status = IEEE80211_SKB_RXCB(skb);
 812
 813         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 814                 kfree_skb(skb);
 815                 return;
 816         }
 817
 818         /*
 819          * Keep packets with CRC errors (and with overrun) for monitor mode
 820          * (otherwise the firmware discards them) but mark them as bad.
 821          */
 822         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 823             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 824                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 825                              le16_to_cpu(desc->status));
 826                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 827         }
 828         /* set the preamble flag if appropriate */
 829         if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
 830                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 831
 832         if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
 833                 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 834                 /* TSF as indicated by the firmware is at INA time */
 835                 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 836         }
 837         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 838         rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
 839                                                NL80211_BAND_2GHZ;
 840         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 841                                                          rx_status->band);
 842         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 843
 844         /* update aggregation data for monitor sake on default queue */
 845         if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
 846                 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
 847
 848                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 849                 rx_status->ampdu_reference = mvm->ampdu_ref;
 850                 /* toggle is switched whenever new aggregation starts */
 851                 if (toggle_bit != mvm->ampdu_toggle) {
 852                         mvm->ampdu_ref++;
 853                         mvm->ampdu_toggle = toggle_bit;
 854                 }
 855         }
 856
 857         rcu_read_lock();
 858
 859         if (desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_SRC_STA_FOUND)) {
 860                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 861
 862                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 863                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 864                         if (IS_ERR(sta))
 865                                 sta = NULL;
 866                 }
 867         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 868                 /*
 869                  * This is fine since we prevent two stations with the same
 870                  * address from being added.
 871                  */
 872                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 873         }
 874
 875         if (sta) {
 876                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 877                 struct ieee80211_vif *tx_blocked_vif =
 878                         rcu_dereference(mvm->csa_tx_blocked_vif);
 879                 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
 880                                IWL_RX_MPDU_REORDER_BAID_MASK) >>
 881                                IWL_RX_MPDU_REORDER_BAID_SHIFT);
 882
 883                 /*
 884                  * We have tx blocked stations (with CS bit). If we heard
 885                  * frames from a blocked station on a new channel we can
 886                  * TX to it again.
 887                  */
 888                 if (unlikely(tx_blocked_vif) &&
 889                     tx_blocked_vif == mvmsta->vif) {
 890                         struct iwl_mvm_vif *mvmvif =
 891                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 892
 893                         if (mvmvif->csa_target_freq == rx_status->freq)
 894                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 895                                                                  false);
 896                 }
 897
 898                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 899
 900                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 901                     ieee80211_is_beacon(hdr->frame_control)) {
 902                         struct iwl_fw_dbg_trigger_tlv *trig;
 903                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 904                         bool trig_check;
 905                         s32 rssi;
 906
 907                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 908                                                       FW_DBG_TRIGGER_RSSI);
 909                         rssi_trig = (void *)trig->data;
 910                         rssi = le32_to_cpu(rssi_trig->rssi);
 911
 912                         trig_check =
 913                                 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 914                                                               ieee80211_vif_to_wdev(mvmsta->vif),
 915                                                               trig);
 916                         if (trig_check && rx_status->signal < rssi)
 917                                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 918                                                         NULL);
 919                 }
 920
 921                 if (ieee80211_is_data(hdr->frame_control))
 922                         iwl_mvm_rx_csum(sta, skb, desc);
 923
 924                 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
 925                         kfree_skb(skb);
 926                         goto out;
 927                 }
 928
 929                 /*
 930                  * Our hardware de-aggregates AMSDUs but copies the mac header
 931                  * as it to the de-aggregated MPDUs. We need to turn off the
 932                  * AMSDU bit in the QoS control ourselves.
 933                  * In addition, HW reverses addr3 and addr4 - reverse it back.
 934                  */
 935                 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
 936                     !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
 937                         int i;
 938                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 939                         u8 mac_addr[ETH_ALEN];
 940
 941                         *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 942
 943                         for (i = 0; i < ETH_ALEN; i++)
 944                                 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1];
 945                         ether_addr_copy(hdr->addr3, mac_addr);
 946
 947                         if (ieee80211_has_a4(hdr->frame_control)) {
 948                                 for (i = 0; i < ETH_ALEN; i++)
 949                                         mac_addr[i] =
 950                                                 hdr->addr4[ETH_ALEN - i - 1];
 951                                 ether_addr_copy(hdr->addr4, mac_addr);
 952                         }
 953                 }
 954                 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) {
 955                         u32 reorder_data = le32_to_cpu(desc->reorder_data);
 956
 957                         iwl_mvm_agg_rx_received(mvm, reorder_data, baid);
 958                 }
 959         }
 960
 961         /* Set up the HT phy flags */
 962         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 963         case RATE_MCS_CHAN_WIDTH_20:
 964                 break;
 965         case RATE_MCS_CHAN_WIDTH_40:
 966                 rx_status->bw = RATE_INFO_BW_40;
 967                 break;
 968         case RATE_MCS_CHAN_WIDTH_80:
 969                 rx_status->bw = RATE_INFO_BW_80;
 970                 break;
 971         case RATE_MCS_CHAN_WIDTH_160:
 972                 rx_status->bw = RATE_INFO_BW_160;
 973                 break;
 974         }
 975         if (rate_n_flags & RATE_MCS_SGI_MSK)
 976                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 977         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 978                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 979         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 980                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 981         if (rate_n_flags & RATE_MCS_HT_MSK) {
 982                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 983                                 RATE_MCS_STBC_POS;
 984                 rx_status->encoding = RX_ENC_HT;
 985                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 986                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 987         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 988                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 989                                 RATE_MCS_STBC_POS;
 990                 rx_status->nss =
 991                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 992                                                 RATE_VHT_MCS_NSS_POS) + 1;
 993                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 994                 rx_status->encoding = RX_ENC_VHT;
 995                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 996                 if (rate_n_flags & RATE_MCS_BF_MSK)
 997                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 998         } else {
 999                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
1000                                                                rx_status->band);
1001
1002                 if (WARN(rate < 0 || rate > 0xFF,
1003                          "Invalid rate flags 0x%x, band %d,\n",
1004                          rate_n_flags, rx_status->band)) {
1005                         kfree_skb(skb);
1006                         goto out;
1007                 }
1008                 rx_status->rate_idx = rate;
1009
1010         }
1011
1012         /* management stuff on default queue */
1013         if (!queue) {
1014                 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
1015                               ieee80211_is_probe_resp(hdr->frame_control)) &&
1016                              mvm->sched_scan_pass_all ==
1017                              SCHED_SCAN_PASS_ALL_ENABLED))
1018                         mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
1019
1020                 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
1021                              ieee80211_is_probe_resp(hdr->frame_control)))
1022                         rx_status->boottime_ns = ktime_get_boot_ns();
1023         }
1024
1025         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
1026         if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
1027                 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
1028 out:
1029         rcu_read_unlock();
1030 }
1031
1032 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
1033                               struct iwl_rx_cmd_buffer *rxb, int queue)
1034 {
1035         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1036         struct iwl_frame_release *release = (void *)pkt->data;
1037         struct ieee80211_sta *sta;
1038         struct iwl_mvm_reorder_buffer *reorder_buf;
1039         struct iwl_mvm_baid_data *ba_data;
1040
1041         int baid = release->baid;
1042
1043         IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
1044                      release->baid, le16_to_cpu(release->nssn));
1045
1046         if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
1047                 return;
1048
1049         rcu_read_lock();
1050
1051         ba_data = rcu_dereference(mvm->baid_map[baid]);
1052         if (WARN_ON_ONCE(!ba_data))
1053                 goto out;
1054
1055         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
1056         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
1057                 goto out;
1058
1059         reorder_buf = &ba_data->reorder_buf[queue];
1060
1061         spin_lock_bh(&reorder_buf->lock);
1062         iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
1063                                le16_to_cpu(release->nssn));
1064         spin_unlock_bh(&reorder_buf->lock);
1065
1066 out:
1067         rcu_read_unlock();
1068 }