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.
  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 - 2017 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 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
  69                                    int queue, struct ieee80211_sta *sta)
  70 {
  71         struct iwl_mvm_sta *mvmsta;
  72         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  73         struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
  74         struct iwl_mvm_key_pn *ptk_pn;
  75         u8 tid, keyidx;
  76         u8 pn[IEEE80211_CCMP_PN_LEN];
  77         u8 *extiv;
  78
  79         /* do PN checking */
  80
  81         /* multicast and non-data only arrives on default queue */
  82         if (!ieee80211_is_data(hdr->frame_control) ||
  83             is_multicast_ether_addr(hdr->addr1))
  84                 return 0;
  85
  86         /* do not check PN for open AP */
  87         if (!(stats->flag & RX_FLAG_DECRYPTED))
  88                 return 0;
  89
  90         /*
  91          * avoid checking for default queue - we don't want to replicate
  92          * all the logic that's necessary for checking the PN on fragmented
  93          * frames, leave that to mac80211
  94          */
  95         if (queue == 0)
  96                 return 0;
  97
  98         /* if we are here - this for sure is either CCMP or GCMP */
  99         if (IS_ERR_OR_NULL(sta)) {
 100                 IWL_ERR(mvm,
 101                         "expected hw-decrypted unicast frame for station\n");
 102                 return -1;
 103         }
 104
 105         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 106
 107         extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
 108         keyidx = extiv[3] >> 6;
 109
 110         ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
 111         if (!ptk_pn)
 112                 return -1;
 113
 114         if (ieee80211_is_data_qos(hdr->frame_control))
 115                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 116         else
 117                 tid = 0;
 118
 119         /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
 120         if (tid >= IWL_MAX_TID_COUNT)
 121                 return -1;
 122
 123         /* load pn */
 124         pn[0] = extiv[7];
 125         pn[1] = extiv[6];
 126         pn[2] = extiv[5];
 127         pn[3] = extiv[4];
 128         pn[4] = extiv[1];
 129         pn[5] = extiv[0];
 130
 131         if (memcmp(pn, ptk_pn->q[queue].pn[tid],
 132                    IEEE80211_CCMP_PN_LEN) <= 0)
 133                 return -1;
 134
 135         if (!(stats->flag & RX_FLAG_AMSDU_MORE))
 136                 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
 137         stats->flag |= RX_FLAG_PN_VALIDATED;
 138
 139         return 0;
 140 }
 141
 142 /* iwl_mvm_create_skb Adds the rxb to a new skb */
 143 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
 144                                u16 len, u8 crypt_len,
 145                                struct iwl_rx_cmd_buffer *rxb)
 146 {
 147         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 148         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 149         unsigned int headlen, fraglen, pad_len = 0;
 150         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 151
 152         if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) {
 153                 pad_len = 2;
 154
 155                 /*
 156                  * If the device inserted padding it means that (it thought)
 157                  * the 802.11 header wasn't a multiple of 4 bytes long. In
 158                  * this case, reserve two bytes at the start of the SKB to
 159                  * align the payload properly in case we end up copying it.
 160                  */
 161                 skb_reserve(skb, pad_len);
 162         }
 163         len -= pad_len;
 164
 165         /* If frame is small enough to fit in skb->head, pull it completely.
 166          * If not, only pull ieee80211_hdr (including crypto if present, and
 167          * an additional 8 bytes for SNAP/ethertype, see below) so that
 168          * splice() or TCP coalesce are more efficient.
 169          *
 170          * Since, in addition, ieee80211_data_to_8023() always pull in at
 171          * least 8 bytes (possibly more for mesh) we can do the same here
 172          * to save the cost of doing it later. That still doesn't pull in
 173          * the actual IP header since the typical case has a SNAP header.
 174          * If the latter changes (there are efforts in the standards group
 175          * to do so) we should revisit this and ieee80211_data_to_8023().
 176          */
 177         headlen = (len <= skb_tailroom(skb)) ? len :
 178                                                hdrlen + crypt_len + 8;
 179
 180         /* The firmware may align the packet to DWORD.
 181          * The padding is inserted after the IV.
 182          * After copying the header + IV skip the padding if
 183          * present before copying packet data.
 184          */
 185         hdrlen += crypt_len;
 186         skb_put_data(skb, hdr, hdrlen);
 187         skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen);
 188
 189         fraglen = len - headlen;
 190
 191         if (fraglen) {
 192                 int offset = (void *)hdr + headlen + pad_len -
 193                              rxb_addr(rxb) + rxb_offset(rxb);
 194
 195                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 196                                 fraglen, rxb->truesize);
 197         }
 198 }
 199
 200 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
 201 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 202                                             struct napi_struct *napi,
 203                                             struct sk_buff *skb, int queue,
 204                                             struct ieee80211_sta *sta)
 205 {
 206         if (iwl_mvm_check_pn(mvm, skb, queue, sta))
 207                 kfree_skb(skb);
 208         else
 209                 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 210 }
 211
 212 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 213                                         struct iwl_rx_mpdu_desc *desc,
 214                                         struct ieee80211_rx_status *rx_status)
 215 {
 216         int energy_a, energy_b, max_energy;
 217
 218         energy_a = desc->energy_a;
 219         energy_a = energy_a ? -energy_a : S8_MIN;
 220         energy_b = desc->energy_b;
 221         energy_b = energy_b ? -energy_b : S8_MIN;
 222         max_energy = max(energy_a, energy_b);
 223
 224         IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
 225                         energy_a, energy_b, max_energy);
 226
 227         rx_status->signal = max_energy;
 228         rx_status->chains = 0; /* TODO: phy info */
 229         rx_status->chain_signal[0] = energy_a;
 230         rx_status->chain_signal[1] = energy_b;
 231         rx_status->chain_signal[2] = S8_MIN;
 232 }
 233
 234 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 235                              struct ieee80211_rx_status *stats,
 236                              struct iwl_rx_mpdu_desc *desc, int queue,
 237                              u8 *crypt_len)
 238 {
 239         u16 status = le16_to_cpu(desc->status);
 240
 241         if (!ieee80211_has_protected(hdr->frame_control) ||
 242             (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 243             IWL_RX_MPDU_STATUS_SEC_NONE)
 244                 return 0;
 245
 246         /* TODO: handle packets encrypted with unknown alg */
 247
 248         switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
 249         case IWL_RX_MPDU_STATUS_SEC_CCM:
 250         case IWL_RX_MPDU_STATUS_SEC_GCM:
 251                 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
 252                 /* alg is CCM: check MIC only */
 253                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 254                         return -1;
 255
 256                 stats->flag |= RX_FLAG_DECRYPTED;
 257                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 258                 return 0;
 259         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 260                 /* Don't drop the frame and decrypt it in SW */
 261                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 262                         return 0;
 263
 264                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 265                 /* fall through if TTAK OK */
 266         case IWL_RX_MPDU_STATUS_SEC_WEP:
 267                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 268                         return -1;
 269
 270                 stats->flag |= RX_FLAG_DECRYPTED;
 271                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 272                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 273                         *crypt_len = IEEE80211_WEP_IV_LEN;
 274                 return 0;
 275         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 276                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 277                         return -1;
 278                 stats->flag |= RX_FLAG_DECRYPTED;
 279                 return 0;
 280         default:
 281                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 282         }
 283
 284         return 0;
 285 }
 286
 287 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 288                             struct sk_buff *skb,
 289                             struct iwl_rx_mpdu_desc *desc)
 290 {
 291         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 292         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 293         u16 flags = le16_to_cpu(desc->l3l4_flags);
 294         u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
 295                           IWL_RX_L3_PROTO_POS);
 296
 297         if (mvmvif->features & NETIF_F_RXCSUM &&
 298             flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
 299             (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
 300              l3_prot == IWL_RX_L3_TYPE_IPV6 ||
 301              l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
 302                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 303 }
 304
 305 /*
 306  * returns true if a packet outside BA session is a duplicate and
 307  * should be dropped
 308  */
 309 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
 310                                   struct ieee80211_rx_status *rx_status,
 311                                   struct ieee80211_hdr *hdr,
 312                                   struct iwl_rx_mpdu_desc *desc)
 313 {
 314         struct iwl_mvm_sta *mvm_sta;
 315         struct iwl_mvm_rxq_dup_data *dup_data;
 316         u8 baid, tid, sub_frame_idx;
 317
 318         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 319                 return false;
 320
 321         baid = (le32_to_cpu(desc->reorder_data) &
 322                 IWL_RX_MPDU_REORDER_BAID_MASK) >>
 323                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 324
 325         if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 326                 return false;
 327
 328         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 329         dup_data = &mvm_sta->dup_data[queue];
 330
 331         /*
 332          * Drop duplicate 802.11 retransmissions
 333          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 334          */
 335         if (ieee80211_is_ctl(hdr->frame_control) ||
 336             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
 337             is_multicast_ether_addr(hdr->addr1)) {
 338                 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 339                 return false;
 340         }
 341
 342         if (ieee80211_is_data_qos(hdr->frame_control))
 343                 /* frame has qos control */
 344                 tid = *ieee80211_get_qos_ctl(hdr) &
 345                         IEEE80211_QOS_CTL_TID_MASK;
 346         else
 347                 tid = IWL_MAX_TID_COUNT;
 348
 349         /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
 350         sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 351
 352         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 353                      dup_data->last_seq[tid] == hdr->seq_ctrl &&
 354                      dup_data->last_sub_frame[tid] >= sub_frame_idx))
 355                 return true;
 356
 357         dup_data->last_seq[tid] = hdr->seq_ctrl;
 358         dup_data->last_sub_frame[tid] = sub_frame_idx;
 359
 360         rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 361
 362         return false;
 363 }
 364
 365 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 366                             const u8 *data, u32 count)
 367 {
 368         struct iwl_rxq_sync_cmd *cmd;
 369         u32 data_size = sizeof(*cmd) + count;
 370         int ret;
 371
 372         /* should be DWORD aligned */
 373         if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
 374                 return -EINVAL;
 375
 376         cmd = kzalloc(data_size, GFP_KERNEL);
 377         if (!cmd)
 378                 return -ENOMEM;
 379
 380         cmd->rxq_mask = cpu_to_le32(rxq_mask);
 381         cmd->count =  cpu_to_le32(count);
 382         cmd->flags = 0;
 383         memcpy(cmd->payload, data, count);
 384
 385         ret = iwl_mvm_send_cmd_pdu(mvm,
 386                                    WIDE_ID(DATA_PATH_GROUP,
 387                                            TRIGGER_RX_QUEUES_NOTIF_CMD),
 388                                    0, data_size, cmd);
 389
 390         kfree(cmd);
 391         return ret;
 392 }
 393
 394 /*
 395  * Returns true if sn2 - buffer_size < sn1 < sn2.
 396  * To be used only in order to compare reorder buffer head with NSSN.
 397  * We fully trust NSSN unless it is behind us due to reorder timeout.
 398  * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
 399  */
 400 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 401 {
 402         return ieee80211_sn_less(sn1, sn2) &&
 403                !ieee80211_sn_less(sn1, sn2 - buffer_size);
 404 }
 405
 406 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 407
 408 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 409                                    struct ieee80211_sta *sta,
 410                                    struct napi_struct *napi,
 411                                    struct iwl_mvm_reorder_buffer *reorder_buf,
 412                                    u16 nssn)
 413 {
 414         u16 ssn = reorder_buf->head_sn;
 415
 416         lockdep_assert_held(&reorder_buf->lock);
 417
 418         /* ignore nssn smaller than head sn - this can happen due to timeout */
 419         if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 420                 goto set_timer;
 421
 422         while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
 423                 int index = ssn % reorder_buf->buf_size;
 424                 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
 425                 struct sk_buff *skb;
 426
 427                 ssn = ieee80211_sn_inc(ssn);
 428
 429                 /*
 430                  * Empty the list. Will have more than one frame for A-MSDU.
 431                  * Empty list is valid as well since nssn indicates frames were
 432                  * received.
 433                  */
 434                 while ((skb = __skb_dequeue(skb_list))) {
 435                         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
 436                                                         reorder_buf->queue,
 437                                                         sta);
 438                         reorder_buf->num_stored--;
 439                 }
 440         }
 441         reorder_buf->head_sn = nssn;
 442
 443 set_timer:
 444         if (reorder_buf->num_stored && !reorder_buf->removed) {
 445                 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
 446
 447                 while (skb_queue_empty(&reorder_buf->entries[index]))
 448                         index = (index + 1) % reorder_buf->buf_size;
 449                 /* modify timer to match next frame's expiration time */
 450                 mod_timer(&reorder_buf->reorder_timer,
 451                           reorder_buf->reorder_time[index] + 1 +
 452                           RX_REORDER_BUF_TIMEOUT_MQ);
 453         } else {
 454                 del_timer(&reorder_buf->reorder_timer);
 455         }
 456 }
 457
 458 void iwl_mvm_reorder_timer_expired(unsigned long data)
 459 {
 460         struct iwl_mvm_reorder_buffer *buf = (void *)data;
 461         int i;
 462         u16 sn = 0, index = 0;
 463         bool expired = false;
 464         bool cont = false;
 465
 466         spin_lock(&buf->lock);
 467
 468         if (!buf->num_stored || buf->removed) {
 469                 spin_unlock(&buf->lock);
 470                 return;
 471         }
 472
 473         for (i = 0; i < buf->buf_size ; i++) {
 474                 index = (buf->head_sn + i) % buf->buf_size;
 475
 476                 if (skb_queue_empty(&buf->entries[index])) {
 477                         /*
 478                          * If there is a hole and the next frame didn't expire
 479                          * we want to break and not advance SN
 480                          */
 481                         cont = false;
 482                         continue;
 483                 }
 484                 if (!cont && !time_after(jiffies, buf->reorder_time[index] +
 485                                          RX_REORDER_BUF_TIMEOUT_MQ))
 486                         break;
 487
 488                 expired = true;
 489                 /* continue until next hole after this expired frames */
 490                 cont = true;
 491                 sn = ieee80211_sn_add(buf->head_sn, i + 1);
 492         }
 493
 494         if (expired) {
 495                 struct ieee80211_sta *sta;
 496
 497                 rcu_read_lock();
 498                 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
 499                 /* SN is set to the last expired frame + 1 */
 500                 IWL_DEBUG_HT(buf->mvm,
 501                              "Releasing expired frames for sta %u, sn %d\n",
 502                              buf->sta_id, sn);
 503                 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
 504                 rcu_read_unlock();
 505         } else {
 506                 /*
 507                  * If no frame expired and there are stored frames, index is now
 508                  * pointing to the first unexpired frame - modify timer
 509                  * accordingly to this frame.
 510                  */
 511                 mod_timer(&buf->reorder_timer,
 512                           buf->reorder_time[index] +
 513                           1 + RX_REORDER_BUF_TIMEOUT_MQ);
 514         }
 515         spin_unlock(&buf->lock);
 516 }
 517
 518 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 519                            struct iwl_mvm_delba_data *data)
 520 {
 521         struct iwl_mvm_baid_data *ba_data;
 522         struct ieee80211_sta *sta;
 523         struct iwl_mvm_reorder_buffer *reorder_buf;
 524         u8 baid = data->baid;
 525
 526         if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
 527                 return;
 528
 529         rcu_read_lock();
 530
 531         ba_data = rcu_dereference(mvm->baid_map[baid]);
 532         if (WARN_ON_ONCE(!ba_data))
 533                 goto out;
 534
 535         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 536         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 537                 goto out;
 538
 539         reorder_buf = &ba_data->reorder_buf[queue];
 540
 541         /* release all frames that are in the reorder buffer to the stack */
 542         spin_lock_bh(&reorder_buf->lock);
 543         iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
 544                                ieee80211_sn_add(reorder_buf->head_sn,
 545                                                 reorder_buf->buf_size));
 546         spin_unlock_bh(&reorder_buf->lock);
 547         del_timer_sync(&reorder_buf->reorder_timer);
 548
 549 out:
 550         rcu_read_unlock();
 551 }
 552
 553 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 554                             int queue)
 555 {
 556         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 557         struct iwl_rxq_sync_notification *notif;
 558         struct iwl_mvm_internal_rxq_notif *internal_notif;
 559
 560         notif = (void *)pkt->data;
 561         internal_notif = (void *)notif->payload;
 562
 563         if (internal_notif->sync) {
 564                 if (mvm->queue_sync_cookie != internal_notif->cookie) {
 565                         WARN_ONCE(1,
 566                                   "Received expired RX queue sync message\n");
 567                         return;
 568                 }
 569                 if (!atomic_dec_return(&mvm->queue_sync_counter))
 570                         wake_up(&mvm->rx_sync_waitq);
 571         }
 572
 573         switch (internal_notif->type) {
 574         case IWL_MVM_RXQ_EMPTY:
 575                 break;
 576         case IWL_MVM_RXQ_NOTIF_DEL_BA:
 577                 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 578                 break;
 579         default:
 580                 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 581         }
 582 }
 583
 584 /*
 585  * Returns true if the MPDU was buffered\dropped, false if it should be passed
 586  * to upper layer.
 587  */
 588 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 589                             struct napi_struct *napi,
 590                             int queue,
 591                             struct ieee80211_sta *sta,
 592                             struct sk_buff *skb,
 593                             struct iwl_rx_mpdu_desc *desc)
 594 {
 595         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 596         struct iwl_mvm_sta *mvm_sta;
 597         struct iwl_mvm_baid_data *baid_data;
 598         struct iwl_mvm_reorder_buffer *buffer;
 599         struct sk_buff *tail;
 600         u32 reorder = le32_to_cpu(desc->reorder_data);
 601         bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
 602         bool last_subframe =
 603                 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
 604         u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 605         u8 sub_frame_idx = desc->amsdu_info &
 606                            IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 607         int index;
 608         u16 nssn, sn;
 609         u8 baid;
 610
 611         baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
 612                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 613
 614         /*
 615          * This also covers the case of receiving a Block Ack Request
 616          * outside a BA session; we'll pass it to mac80211 and that
 617          * then sends a delBA action frame.
 618          */
 619         if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
 620                 return false;
 621
 622         /* no sta yet */
 623         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 624                 return false;
 625
 626         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 627
 628         /* not a data packet or a bar */
 629         if (!ieee80211_is_back_req(hdr->frame_control) &&
 630             (!ieee80211_is_data_qos(hdr->frame_control) ||
 631              is_multicast_ether_addr(hdr->addr1)))
 632                 return false;
 633
 634         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 635                 return false;
 636
 637         baid_data = rcu_dereference(mvm->baid_map[baid]);
 638         if (!baid_data) {
 639                 IWL_DEBUG_RX(mvm,
 640                              "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
 641                               baid, reorder);
 642                 return false;
 643         }
 644
 645         if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
 646                  "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
 647                  baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
 648                  tid))
 649                 return false;
 650
 651         nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
 652         sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
 653                 IWL_RX_MPDU_REORDER_SN_SHIFT;
 654
 655         buffer = &baid_data->reorder_buf[queue];
 656
 657         spin_lock_bh(&buffer->lock);
 658
 659         if (!buffer->valid) {
 660                 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) {
 661                         spin_unlock_bh(&buffer->lock);
 662                         return false;
 663                 }
 664                 buffer->valid = true;
 665         }
 666
 667         if (ieee80211_is_back_req(hdr->frame_control)) {
 668                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 669                 goto drop;
 670         }
 671
 672         /*
 673          * If there was a significant jump in the nssn - adjust.
 674          * If the SN is smaller than the NSSN it might need to first go into
 675          * the reorder buffer, in which case we just release up to it and the
 676          * rest of the function will take of storing it and releasing up to the
 677          * nssn
 678          */
 679         if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 680                                 buffer->buf_size)) {
 681                 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 682
 683                 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
 684         }
 685
 686         /* drop any oudated packets */
 687         if (ieee80211_sn_less(sn, buffer->head_sn))
 688                 goto drop;
 689
 690         /* release immediately if allowed by nssn and no stored frames */
 691         if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 692                 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 693                                        buffer->buf_size) &&
 694                    (!amsdu || last_subframe))
 695                         buffer->head_sn = nssn;
 696                 /* No need to update AMSDU last SN - we are moving the head */
 697                 spin_unlock_bh(&buffer->lock);
 698                 return false;
 699         }
 700
 701         index = sn % buffer->buf_size;
 702
 703         /*
 704          * Check if we already stored this frame
 705          * As AMSDU is either received or not as whole, logic is simple:
 706          * If we have frames in that position in the buffer and the last frame
 707          * originated from AMSDU had a different SN then it is a retransmission.
 708          * If it is the same SN then if the subframe index is incrementing it
 709          * is the same AMSDU - otherwise it is a retransmission.
 710          */
 711         tail = skb_peek_tail(&buffer->entries[index]);
 712         if (tail && !amsdu)
 713                 goto drop;
 714         else if (tail && (sn != buffer->last_amsdu ||
 715                           buffer->last_sub_index >= sub_frame_idx))
 716                 goto drop;
 717
 718         /* put in reorder buffer */
 719         __skb_queue_tail(&buffer->entries[index], skb);
 720         buffer->num_stored++;
 721         buffer->reorder_time[index] = jiffies;
 722
 723         if (amsdu) {
 724                 buffer->last_amsdu = sn;
 725                 buffer->last_sub_index = sub_frame_idx;
 726         }
 727
 728         /*
 729          * We cannot trust NSSN for AMSDU sub-frames that are not the last.
 730          * The reason is that NSSN advances on the first sub-frame, and may
 731          * cause the reorder buffer to advance before all the sub-frames arrive.
 732          * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
 733          * SN 1. NSSN for first sub frame will be 3 with the result of driver
 734          * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
 735          * already ahead and it will be dropped.
 736          * If the last sub-frame is not on this queue - we will get frame
 737          * release notification with up to date NSSN.
 738          */
 739         if (!amsdu || last_subframe)
 740                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 741
 742         spin_unlock_bh(&buffer->lock);
 743         return true;
 744
 745 drop:
 746         kfree_skb(skb);
 747         spin_unlock_bh(&buffer->lock);
 748         return true;
 749 }
 750
 751 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm,
 752                                     u32 reorder_data, u8 baid)
 753 {
 754         unsigned long now = jiffies;
 755         unsigned long timeout;
 756         struct iwl_mvm_baid_data *data;
 757
 758         rcu_read_lock();
 759
 760         data = rcu_dereference(mvm->baid_map[baid]);
 761         if (!data) {
 762                 IWL_DEBUG_RX(mvm,
 763                              "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
 764                               baid, reorder_data);
 765                 goto out;
 766         }
 767
 768         if (!data->timeout)
 769                 goto out;
 770
 771         timeout = data->timeout;
 772         /*
 773          * Do not update last rx all the time to avoid cache bouncing
 774          * between the rx queues.
 775          * Update it every timeout. Worst case is the session will
 776          * expire after ~ 2 * timeout, which doesn't matter that much.
 777          */
 778         if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
 779                 /* Update is atomic */
 780                 data->last_rx = now;
 781
 782 out:
 783         rcu_read_unlock();
 784 }
 785
 786 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 787                         struct iwl_rx_cmd_buffer *rxb, int queue)
 788 {
 789         struct ieee80211_rx_status *rx_status;
 790         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 791         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 792         struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 793         u32 len = le16_to_cpu(desc->mpdu_len);
 794         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 795         u16 phy_info = le16_to_cpu(desc->phy_info);
 796         struct ieee80211_sta *sta = NULL;
 797         struct sk_buff *skb;
 798         u8 crypt_len = 0;
 799
 800         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 801          * ieee80211_hdr pulled.
 802          */
 803         skb = alloc_skb(128, GFP_ATOMIC);
 804         if (!skb) {
 805                 IWL_ERR(mvm, "alloc_skb failed\n");
 806                 return;
 807         }
 808
 809         rx_status = IEEE80211_SKB_RXCB(skb);
 810
 811         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 812                 kfree_skb(skb);
 813                 return;
 814         }
 815
 816         /*
 817          * Keep packets with CRC errors (and with overrun) for monitor mode
 818          * (otherwise the firmware discards them) but mark them as bad.
 819          */
 820         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 821             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 822                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 823                              le16_to_cpu(desc->status));
 824                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 825         }
 826         /* set the preamble flag if appropriate */
 827         if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
 828                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 829
 830         if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
 831                 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 832                 /* TSF as indicated by the firmware is at INA time */
 833                 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 834         }
 835         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 836         rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
 837                                                NL80211_BAND_2GHZ;
 838         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 839                                                          rx_status->band);
 840         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 841
 842         /* update aggregation data for monitor sake on default queue */
 843         if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
 844                 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
 845
 846                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 847                 rx_status->ampdu_reference = mvm->ampdu_ref;
 848                 /* toggle is switched whenever new aggregation starts */
 849                 if (toggle_bit != mvm->ampdu_toggle) {
 850                         mvm->ampdu_ref++;
 851                         mvm->ampdu_toggle = toggle_bit;
 852                 }
 853         }
 854
 855         rcu_read_lock();
 856
 857         if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
 858                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 859
 860                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 861                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 862                         if (IS_ERR(sta))
 863                                 sta = NULL;
 864                 }
 865         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 866                 /*
 867                  * This is fine since we prevent two stations with the same
 868                  * address from being added.
 869                  */
 870                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 871         }
 872
 873         if (sta) {
 874                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 875                 struct ieee80211_vif *tx_blocked_vif =
 876                         rcu_dereference(mvm->csa_tx_blocked_vif);
 877                 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
 878                                IWL_RX_MPDU_REORDER_BAID_MASK) >>
 879                                IWL_RX_MPDU_REORDER_BAID_SHIFT);
 880
 881                 /*
 882                  * We have tx blocked stations (with CS bit). If we heard
 883                  * frames from a blocked station on a new channel we can
 884                  * TX to it again.
 885                  */
 886                 if (unlikely(tx_blocked_vif) &&
 887                     tx_blocked_vif == mvmsta->vif) {
 888                         struct iwl_mvm_vif *mvmvif =
 889                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 890
 891                         if (mvmvif->csa_target_freq == rx_status->freq)
 892                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 893                                                                  false);
 894                 }
 895
 896                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 897
 898                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 899                     ieee80211_is_beacon(hdr->frame_control)) {
 900                         struct iwl_fw_dbg_trigger_tlv *trig;
 901                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 902                         bool trig_check;
 903                         s32 rssi;
 904
 905                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 906                                                       FW_DBG_TRIGGER_RSSI);
 907                         rssi_trig = (void *)trig->data;
 908                         rssi = le32_to_cpu(rssi_trig->rssi);
 909
 910                         trig_check =
 911                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 912                                                               trig);
 913                         if (trig_check && rx_status->signal < rssi)
 914                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 915                 }
 916
 917                 if (ieee80211_is_data(hdr->frame_control))
 918                         iwl_mvm_rx_csum(sta, skb, desc);
 919
 920                 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
 921                         kfree_skb(skb);
 922                         goto out;
 923                 }
 924
 925                 /*
 926                  * Our hardware de-aggregates AMSDUs but copies the mac header
 927                  * as it to the de-aggregated MPDUs. We need to turn off the
 928                  * AMSDU bit in the QoS control ourselves.
 929                  * In addition, HW reverses addr3 and addr4 - reverse it back.
 930                  */
 931                 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
 932                     !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
 933                         int i;
 934                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 935                         u8 mac_addr[ETH_ALEN];
 936
 937                         *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 938
 939                         for (i = 0; i < ETH_ALEN; i++)
 940                                 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1];
 941                         ether_addr_copy(hdr->addr3, mac_addr);
 942
 943                         if (ieee80211_has_a4(hdr->frame_control)) {
 944                                 for (i = 0; i < ETH_ALEN; i++)
 945                                         mac_addr[i] =
 946                                                 hdr->addr4[ETH_ALEN - i - 1];
 947                                 ether_addr_copy(hdr->addr4, mac_addr);
 948                         }
 949                 }
 950                 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) {
 951                         u32 reorder_data = le32_to_cpu(desc->reorder_data);
 952
 953                         iwl_mvm_agg_rx_received(mvm, reorder_data, baid);
 954                 }
 955         }
 956
 957         /* Set up the HT phy flags */
 958         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 959         case RATE_MCS_CHAN_WIDTH_20:
 960                 break;
 961         case RATE_MCS_CHAN_WIDTH_40:
 962                 rx_status->bw = RATE_INFO_BW_40;
 963                 break;
 964         case RATE_MCS_CHAN_WIDTH_80:
 965                 rx_status->bw = RATE_INFO_BW_80;
 966                 break;
 967         case RATE_MCS_CHAN_WIDTH_160:
 968                 rx_status->bw = RATE_INFO_BW_160;
 969                 break;
 970         }
 971         if (rate_n_flags & RATE_MCS_SGI_MSK)
 972                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 973         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 974                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 975         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 976                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 977         if (rate_n_flags & RATE_MCS_HT_MSK) {
 978                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 979                                 RATE_MCS_STBC_POS;
 980                 rx_status->encoding = RX_ENC_HT;
 981                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 982                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 983         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 984                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 985                                 RATE_MCS_STBC_POS;
 986                 rx_status->nss =
 987                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 988                                                 RATE_VHT_MCS_NSS_POS) + 1;
 989                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 990                 rx_status->encoding = RX_ENC_VHT;
 991                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 992                 if (rate_n_flags & RATE_MCS_BF_MSK)
 993                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 994         } else {
 995                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 996                                                                rx_status->band);
 997
 998                 if (WARN(rate < 0 || rate > 0xFF,
 999                          "Invalid rate flags 0x%x, band %d,\n",
1000                          rate_n_flags, rx_status->band)) {
1001                         kfree_skb(skb);
1002                         goto out;
1003                 }
1004                 rx_status->rate_idx = rate;
1005
1006         }
1007
1008         /* management stuff on default queue */
1009         if (!queue) {
1010                 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
1011                               ieee80211_is_probe_resp(hdr->frame_control)) &&
1012                              mvm->sched_scan_pass_all ==
1013                              SCHED_SCAN_PASS_ALL_ENABLED))
1014                         mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
1015
1016                 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
1017                              ieee80211_is_probe_resp(hdr->frame_control)))
1018                         rx_status->boottime_ns = ktime_get_boot_ns();
1019         }
1020
1021         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
1022         if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
1023                 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
1024 out:
1025         rcu_read_unlock();
1026 }
1027
1028 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
1029                               struct iwl_rx_cmd_buffer *rxb, int queue)
1030 {
1031         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1032         struct iwl_frame_release *release = (void *)pkt->data;
1033         struct ieee80211_sta *sta;
1034         struct iwl_mvm_reorder_buffer *reorder_buf;
1035         struct iwl_mvm_baid_data *ba_data;
1036
1037         int baid = release->baid;
1038
1039         IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
1040                      release->baid, le16_to_cpu(release->nssn));
1041
1042         if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
1043                 return;
1044
1045         rcu_read_lock();
1046
1047         ba_data = rcu_dereference(mvm->baid_map[baid]);
1048         if (WARN_ON_ONCE(!ba_data))
1049                 goto out;
1050
1051         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
1052         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
1053                 goto out;
1054
1055         reorder_buf = &ba_data->reorder_buf[queue];
1056
1057         spin_lock_bh(&reorder_buf->lock);
1058         iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
1059                                le16_to_cpu(release->nssn));
1060         spin_unlock_bh(&reorder_buf->lock);
1061
1062 out:
1063         rcu_read_unlock();
1064 }