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 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 int res; 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 res = memcmp(pn, ptk_pn->q[queue].pn[tid], IEEE80211_CCMP_PN_LEN); 132 if (res < 0) 133 return -1; 134 if (!res && !(stats->flag & RX_FLAG_ALLOW_SAME_PN)) 135 return -1; 136 137 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN); 138 stats->flag |= RX_FLAG_PN_VALIDATED; 139 140 return 0; 141 } 142 143 /* iwl_mvm_create_skb Adds the rxb to a new skb */ 144 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr, 145 u16 len, u8 crypt_len, 146 struct iwl_rx_cmd_buffer *rxb) 147 { 148 struct iwl_rx_packet *pkt = rxb_addr(rxb); 149 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 150 unsigned int headlen, fraglen, pad_len = 0; 151 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); 152 153 if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) { 154 pad_len = 2; 155 156 /* 157 * If the device inserted padding it means that (it thought) 158 * the 802.11 header wasn't a multiple of 4 bytes long. In 159 * this case, reserve two bytes at the start of the SKB to 160 * align the payload properly in case we end up copying it. 161 */ 162 skb_reserve(skb, pad_len); 163 } 164 len -= pad_len; 165 166 /* If frame is small enough to fit in skb->head, pull it completely. 167 * If not, only pull ieee80211_hdr (including crypto if present, and 168 * an additional 8 bytes for SNAP/ethertype, see below) so that 169 * splice() or TCP coalesce are more efficient. 170 * 171 * Since, in addition, ieee80211_data_to_8023() always pull in at 172 * least 8 bytes (possibly more for mesh) we can do the same here 173 * to save the cost of doing it later. That still doesn't pull in 174 * the actual IP header since the typical case has a SNAP header. 175 * If the latter changes (there are efforts in the standards group 176 * to do so) we should revisit this and ieee80211_data_to_8023(). 177 */ 178 headlen = (len <= skb_tailroom(skb)) ? len : 179 hdrlen + crypt_len + 8; 180 181 /* The firmware may align the packet to DWORD. 182 * The padding is inserted after the IV. 183 * After copying the header + IV skip the padding if 184 * present before copying packet data. 185 */ 186 hdrlen += crypt_len; 187 skb_put_data(skb, hdr, hdrlen); 188 skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen); 189 190 fraglen = len - headlen; 191 192 if (fraglen) { 193 int offset = (void *)hdr + headlen + pad_len - 194 rxb_addr(rxb) + rxb_offset(rxb); 195 196 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 197 fraglen, rxb->truesize); 198 } 199 } 200 201 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ 202 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, 203 struct napi_struct *napi, 204 struct sk_buff *skb, int queue, 205 struct ieee80211_sta *sta) 206 { 207 if (iwl_mvm_check_pn(mvm, skb, queue, sta)) 208 kfree_skb(skb); 209 else 210 ieee80211_rx_napi(mvm->hw, sta, skb, napi); 211 } 212 213 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 214 struct iwl_rx_mpdu_desc *desc, 215 struct ieee80211_rx_status *rx_status) 216 { 217 int energy_a, energy_b, max_energy; 218 u32 rate_flags = le32_to_cpu(desc->rate_n_flags); 219 220 energy_a = desc->energy_a; 221 energy_a = energy_a ? -energy_a : S8_MIN; 222 energy_b = desc->energy_b; 223 energy_b = energy_b ? -energy_b : S8_MIN; 224 max_energy = max(energy_a, energy_b); 225 226 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", 227 energy_a, energy_b, max_energy); 228 229 rx_status->signal = max_energy; 230 rx_status->chains = 231 (rate_flags & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS; 232 rx_status->chain_signal[0] = energy_a; 233 rx_status->chain_signal[1] = energy_b; 234 rx_status->chain_signal[2] = S8_MIN; 235 } 236 237 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, 238 struct ieee80211_rx_status *stats, 239 struct iwl_rx_mpdu_desc *desc, u32 pkt_flags, 240 int queue, u8 *crypt_len) 241 { 242 u16 status = le16_to_cpu(desc->status); 243 244 if (!ieee80211_has_protected(hdr->frame_control) || 245 (status & IWL_RX_MPDU_STATUS_SEC_MASK) == 246 IWL_RX_MPDU_STATUS_SEC_NONE) 247 return 0; 248 249 /* TODO: handle packets encrypted with unknown alg */ 250 251 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { 252 case IWL_RX_MPDU_STATUS_SEC_CCM: 253 case IWL_RX_MPDU_STATUS_SEC_GCM: 254 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); 255 /* alg is CCM: check MIC only */ 256 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 257 return -1; 258 259 stats->flag |= RX_FLAG_DECRYPTED; 260 if (pkt_flags & FH_RSCSR_RADA_EN) 261 stats->flag |= RX_FLAG_MIC_STRIPPED; 262 *crypt_len = IEEE80211_CCMP_HDR_LEN; 263 return 0; 264 case IWL_RX_MPDU_STATUS_SEC_TKIP: 265 /* Don't drop the frame and decrypt it in SW */ 266 if (!fw_has_api(&mvm->fw->ucode_capa, 267 IWL_UCODE_TLV_API_DEPRECATE_TTAK) && 268 !(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) 269 return 0; 270 271 *crypt_len = IEEE80211_TKIP_IV_LEN; 272 /* fall through if TTAK OK */ 273 case IWL_RX_MPDU_STATUS_SEC_WEP: 274 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) 275 return -1; 276 277 stats->flag |= RX_FLAG_DECRYPTED; 278 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == 279 IWL_RX_MPDU_STATUS_SEC_WEP) 280 *crypt_len = IEEE80211_WEP_IV_LEN; 281 282 if (pkt_flags & FH_RSCSR_RADA_EN) 283 stats->flag |= RX_FLAG_ICV_STRIPPED; 284 285 return 0; 286 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: 287 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 288 return -1; 289 stats->flag |= RX_FLAG_DECRYPTED; 290 return 0; 291 default: 292 /* Expected in monitor (not having the keys) */ 293 if (!mvm->monitor_on) 294 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); 295 } 296 297 return 0; 298 } 299 300 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, 301 struct sk_buff *skb, 302 struct iwl_rx_mpdu_desc *desc) 303 { 304 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 305 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 306 u16 flags = le16_to_cpu(desc->l3l4_flags); 307 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> 308 IWL_RX_L3_PROTO_POS); 309 310 if (mvmvif->features & NETIF_F_RXCSUM && 311 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && 312 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || 313 l3_prot == IWL_RX_L3_TYPE_IPV6 || 314 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) 315 skb->ip_summed = CHECKSUM_UNNECESSARY; 316 } 317 318 /* 319 * returns true if a packet is a duplicate and should be dropped. 320 * Updates AMSDU PN tracking info 321 */ 322 static bool iwl_mvm_is_dup(struct ieee80211_sta *sta, int queue, 323 struct ieee80211_rx_status *rx_status, 324 struct ieee80211_hdr *hdr, 325 struct iwl_rx_mpdu_desc *desc) 326 { 327 struct iwl_mvm_sta *mvm_sta; 328 struct iwl_mvm_rxq_dup_data *dup_data; 329 u8 tid, sub_frame_idx; 330 331 if (WARN_ON(IS_ERR_OR_NULL(sta))) 332 return false; 333 334 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 335 dup_data = &mvm_sta->dup_data[queue]; 336 337 /* 338 * Drop duplicate 802.11 retransmissions 339 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 340 */ 341 if (ieee80211_is_ctl(hdr->frame_control) || 342 ieee80211_is_qos_nullfunc(hdr->frame_control) || 343 is_multicast_ether_addr(hdr->addr1)) { 344 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 345 return false; 346 } 347 348 if (ieee80211_is_data_qos(hdr->frame_control)) 349 /* frame has qos control */ 350 tid = *ieee80211_get_qos_ctl(hdr) & 351 IEEE80211_QOS_CTL_TID_MASK; 352 else 353 tid = IWL_MAX_TID_COUNT; 354 355 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ 356 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 357 358 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 359 dup_data->last_seq[tid] == hdr->seq_ctrl && 360 dup_data->last_sub_frame[tid] >= sub_frame_idx)) 361 return true; 362 363 /* Allow same PN as the first subframe for following sub frames */ 364 if (dup_data->last_seq[tid] == hdr->seq_ctrl && 365 sub_frame_idx > dup_data->last_sub_frame[tid] && 366 desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) 367 rx_status->flag |= RX_FLAG_ALLOW_SAME_PN; 368 369 dup_data->last_seq[tid] = hdr->seq_ctrl; 370 dup_data->last_sub_frame[tid] = sub_frame_idx; 371 372 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 373 374 return false; 375 } 376 377 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, 378 const u8 *data, u32 count) 379 { 380 struct iwl_rxq_sync_cmd *cmd; 381 u32 data_size = sizeof(*cmd) + count; 382 int ret; 383 384 /* should be DWORD aligned */ 385 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) 386 return -EINVAL; 387 388 cmd = kzalloc(data_size, GFP_KERNEL); 389 if (!cmd) 390 return -ENOMEM; 391 392 cmd->rxq_mask = cpu_to_le32(rxq_mask); 393 cmd->count = cpu_to_le32(count); 394 cmd->flags = 0; 395 memcpy(cmd->payload, data, count); 396 397 ret = iwl_mvm_send_cmd_pdu(mvm, 398 WIDE_ID(DATA_PATH_GROUP, 399 TRIGGER_RX_QUEUES_NOTIF_CMD), 400 0, data_size, cmd); 401 402 kfree(cmd); 403 return ret; 404 } 405 406 /* 407 * Returns true if sn2 - buffer_size < sn1 < sn2. 408 * To be used only in order to compare reorder buffer head with NSSN. 409 * We fully trust NSSN unless it is behind us due to reorder timeout. 410 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. 411 */ 412 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) 413 { 414 return ieee80211_sn_less(sn1, sn2) && 415 !ieee80211_sn_less(sn1, sn2 - buffer_size); 416 } 417 418 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10) 419 420 static void iwl_mvm_release_frames(struct iwl_mvm *mvm, 421 struct ieee80211_sta *sta, 422 struct napi_struct *napi, 423 struct iwl_mvm_baid_data *baid_data, 424 struct iwl_mvm_reorder_buffer *reorder_buf, 425 u16 nssn) 426 { 427 struct iwl_mvm_reorder_buf_entry *entries = 428 &baid_data->entries[reorder_buf->queue * 429 baid_data->entries_per_queue]; 430 u16 ssn = reorder_buf->head_sn; 431 432 lockdep_assert_held(&reorder_buf->lock); 433 434 /* ignore nssn smaller than head sn - this can happen due to timeout */ 435 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 436 goto set_timer; 437 438 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 439 int index = ssn % reorder_buf->buf_size; 440 struct sk_buff_head *skb_list = &entries[index].e.frames; 441 struct sk_buff *skb; 442 443 ssn = ieee80211_sn_inc(ssn); 444 445 /* 446 * Empty the list. Will have more than one frame for A-MSDU. 447 * Empty list is valid as well since nssn indicates frames were 448 * received. 449 */ 450 while ((skb = __skb_dequeue(skb_list))) { 451 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 452 reorder_buf->queue, 453 sta); 454 reorder_buf->num_stored--; 455 } 456 } 457 reorder_buf->head_sn = nssn; 458 459 set_timer: 460 if (reorder_buf->num_stored && !reorder_buf->removed) { 461 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 462 463 while (skb_queue_empty(&entries[index].e.frames)) 464 index = (index + 1) % reorder_buf->buf_size; 465 /* modify timer to match next frame's expiration time */ 466 mod_timer(&reorder_buf->reorder_timer, 467 entries[index].e.reorder_time + 1 + 468 RX_REORDER_BUF_TIMEOUT_MQ); 469 } else { 470 del_timer(&reorder_buf->reorder_timer); 471 } 472 } 473 474 void iwl_mvm_reorder_timer_expired(struct timer_list *t) 475 { 476 struct iwl_mvm_reorder_buffer *buf = from_timer(buf, t, reorder_timer); 477 struct iwl_mvm_baid_data *baid_data = 478 iwl_mvm_baid_data_from_reorder_buf(buf); 479 struct iwl_mvm_reorder_buf_entry *entries = 480 &baid_data->entries[buf->queue * baid_data->entries_per_queue]; 481 int i; 482 u16 sn = 0, index = 0; 483 bool expired = false; 484 bool cont = false; 485 486 spin_lock(&buf->lock); 487 488 if (!buf->num_stored || buf->removed) { 489 spin_unlock(&buf->lock); 490 return; 491 } 492 493 for (i = 0; i < buf->buf_size ; i++) { 494 index = (buf->head_sn + i) % buf->buf_size; 495 496 if (skb_queue_empty(&entries[index].e.frames)) { 497 /* 498 * If there is a hole and the next frame didn't expire 499 * we want to break and not advance SN 500 */ 501 cont = false; 502 continue; 503 } 504 if (!cont && 505 !time_after(jiffies, entries[index].e.reorder_time + 506 RX_REORDER_BUF_TIMEOUT_MQ)) 507 break; 508 509 expired = true; 510 /* continue until next hole after this expired frames */ 511 cont = true; 512 sn = ieee80211_sn_add(buf->head_sn, i + 1); 513 } 514 515 if (expired) { 516 struct ieee80211_sta *sta; 517 struct iwl_mvm_sta *mvmsta; 518 u8 sta_id = baid_data->sta_id; 519 520 rcu_read_lock(); 521 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[sta_id]); 522 mvmsta = iwl_mvm_sta_from_mac80211(sta); 523 524 /* SN is set to the last expired frame + 1 */ 525 IWL_DEBUG_HT(buf->mvm, 526 "Releasing expired frames for sta %u, sn %d\n", 527 sta_id, sn); 528 iwl_mvm_event_frame_timeout_callback(buf->mvm, mvmsta->vif, 529 sta, baid_data->tid); 530 iwl_mvm_release_frames(buf->mvm, sta, NULL, baid_data, buf, sn); 531 rcu_read_unlock(); 532 } else { 533 /* 534 * If no frame expired and there are stored frames, index is now 535 * pointing to the first unexpired frame - modify timer 536 * accordingly to this frame. 537 */ 538 mod_timer(&buf->reorder_timer, 539 entries[index].e.reorder_time + 540 1 + RX_REORDER_BUF_TIMEOUT_MQ); 541 } 542 spin_unlock(&buf->lock); 543 } 544 545 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 546 struct iwl_mvm_delba_data *data) 547 { 548 struct iwl_mvm_baid_data *ba_data; 549 struct ieee80211_sta *sta; 550 struct iwl_mvm_reorder_buffer *reorder_buf; 551 u8 baid = data->baid; 552 553 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) 554 return; 555 556 rcu_read_lock(); 557 558 ba_data = rcu_dereference(mvm->baid_map[baid]); 559 if (WARN_ON_ONCE(!ba_data)) 560 goto out; 561 562 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 563 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 564 goto out; 565 566 reorder_buf = &ba_data->reorder_buf[queue]; 567 568 /* release all frames that are in the reorder buffer to the stack */ 569 spin_lock_bh(&reorder_buf->lock); 570 iwl_mvm_release_frames(mvm, sta, NULL, ba_data, reorder_buf, 571 ieee80211_sn_add(reorder_buf->head_sn, 572 reorder_buf->buf_size)); 573 spin_unlock_bh(&reorder_buf->lock); 574 del_timer_sync(&reorder_buf->reorder_timer); 575 576 out: 577 rcu_read_unlock(); 578 } 579 580 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 581 int queue) 582 { 583 struct iwl_rx_packet *pkt = rxb_addr(rxb); 584 struct iwl_rxq_sync_notification *notif; 585 struct iwl_mvm_internal_rxq_notif *internal_notif; 586 587 notif = (void *)pkt->data; 588 internal_notif = (void *)notif->payload; 589 590 if (internal_notif->sync) { 591 if (mvm->queue_sync_cookie != internal_notif->cookie) { 592 WARN_ONCE(1, 593 "Received expired RX queue sync message\n"); 594 return; 595 } 596 if (!atomic_dec_return(&mvm->queue_sync_counter)) 597 wake_up(&mvm->rx_sync_waitq); 598 } 599 600 switch (internal_notif->type) { 601 case IWL_MVM_RXQ_EMPTY: 602 break; 603 case IWL_MVM_RXQ_NOTIF_DEL_BA: 604 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 605 break; 606 default: 607 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 608 } 609 } 610 611 /* 612 * Returns true if the MPDU was buffered\dropped, false if it should be passed 613 * to upper layer. 614 */ 615 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 616 struct napi_struct *napi, 617 int queue, 618 struct ieee80211_sta *sta, 619 struct sk_buff *skb, 620 struct iwl_rx_mpdu_desc *desc) 621 { 622 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 623 struct iwl_mvm_sta *mvm_sta; 624 struct iwl_mvm_baid_data *baid_data; 625 struct iwl_mvm_reorder_buffer *buffer; 626 struct sk_buff *tail; 627 u32 reorder = le32_to_cpu(desc->reorder_data); 628 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 629 bool last_subframe = 630 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 631 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 632 u8 sub_frame_idx = desc->amsdu_info & 633 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 634 struct iwl_mvm_reorder_buf_entry *entries; 635 int index; 636 u16 nssn, sn; 637 u8 baid; 638 639 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 640 IWL_RX_MPDU_REORDER_BAID_SHIFT; 641 642 /* 643 * This also covers the case of receiving a Block Ack Request 644 * outside a BA session; we'll pass it to mac80211 and that 645 * then sends a delBA action frame. 646 */ 647 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 648 return false; 649 650 /* no sta yet */ 651 if (WARN_ONCE(IS_ERR_OR_NULL(sta), 652 "Got valid BAID without a valid station assigned\n")) 653 return false; 654 655 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 656 657 /* not a data packet or a bar */ 658 if (!ieee80211_is_back_req(hdr->frame_control) && 659 (!ieee80211_is_data_qos(hdr->frame_control) || 660 is_multicast_ether_addr(hdr->addr1))) 661 return false; 662 663 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 664 return false; 665 666 baid_data = rcu_dereference(mvm->baid_map[baid]); 667 if (!baid_data) { 668 IWL_DEBUG_RX(mvm, 669 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 670 baid, reorder); 671 return false; 672 } 673 674 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 675 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 676 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 677 tid)) 678 return false; 679 680 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 681 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 682 IWL_RX_MPDU_REORDER_SN_SHIFT; 683 684 buffer = &baid_data->reorder_buf[queue]; 685 entries = &baid_data->entries[queue * baid_data->entries_per_queue]; 686 687 spin_lock_bh(&buffer->lock); 688 689 if (!buffer->valid) { 690 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) { 691 spin_unlock_bh(&buffer->lock); 692 return false; 693 } 694 buffer->valid = true; 695 } 696 697 if (ieee80211_is_back_req(hdr->frame_control)) { 698 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn); 699 goto drop; 700 } 701 702 /* 703 * If there was a significant jump in the nssn - adjust. 704 * If the SN is smaller than the NSSN it might need to first go into 705 * the reorder buffer, in which case we just release up to it and the 706 * rest of the function will take care of storing it and releasing up to 707 * the nssn 708 */ 709 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 710 buffer->buf_size) || 711 !ieee80211_sn_less(sn, buffer->head_sn + buffer->buf_size)) { 712 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 713 714 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, 715 min_sn); 716 } 717 718 /* drop any oudated packets */ 719 if (ieee80211_sn_less(sn, buffer->head_sn)) 720 goto drop; 721 722 /* release immediately if allowed by nssn and no stored frames */ 723 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 724 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 725 buffer->buf_size) && 726 (!amsdu || last_subframe)) 727 buffer->head_sn = nssn; 728 /* No need to update AMSDU last SN - we are moving the head */ 729 spin_unlock_bh(&buffer->lock); 730 return false; 731 } 732 733 /* 734 * release immediately if there are no stored frames, and the sn is 735 * equal to the head. 736 * This can happen due to reorder timer, where NSSN is behind head_sn. 737 * When we released everything, and we got the next frame in the 738 * sequence, according to the NSSN we can't release immediately, 739 * while technically there is no hole and we can move forward. 740 */ 741 if (!buffer->num_stored && sn == buffer->head_sn) { 742 if (!amsdu || last_subframe) 743 buffer->head_sn = ieee80211_sn_inc(buffer->head_sn); 744 /* No need to update AMSDU last SN - we are moving the head */ 745 spin_unlock_bh(&buffer->lock); 746 return false; 747 } 748 749 index = sn % buffer->buf_size; 750 751 /* 752 * Check if we already stored this frame 753 * As AMSDU is either received or not as whole, logic is simple: 754 * If we have frames in that position in the buffer and the last frame 755 * originated from AMSDU had a different SN then it is a retransmission. 756 * If it is the same SN then if the subframe index is incrementing it 757 * is the same AMSDU - otherwise it is a retransmission. 758 */ 759 tail = skb_peek_tail(&entries[index].e.frames); 760 if (tail && !amsdu) 761 goto drop; 762 else if (tail && (sn != buffer->last_amsdu || 763 buffer->last_sub_index >= sub_frame_idx)) 764 goto drop; 765 766 /* put in reorder buffer */ 767 __skb_queue_tail(&entries[index].e.frames, skb); 768 buffer->num_stored++; 769 entries[index].e.reorder_time = jiffies; 770 771 if (amsdu) { 772 buffer->last_amsdu = sn; 773 buffer->last_sub_index = sub_frame_idx; 774 } 775 776 /* 777 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 778 * The reason is that NSSN advances on the first sub-frame, and may 779 * cause the reorder buffer to advance before all the sub-frames arrive. 780 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 781 * SN 1. NSSN for first sub frame will be 3 with the result of driver 782 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 783 * already ahead and it will be dropped. 784 * If the last sub-frame is not on this queue - we will get frame 785 * release notification with up to date NSSN. 786 */ 787 if (!amsdu || last_subframe) 788 iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn); 789 790 spin_unlock_bh(&buffer->lock); 791 return true; 792 793 drop: 794 kfree_skb(skb); 795 spin_unlock_bh(&buffer->lock); 796 return true; 797 } 798 799 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, 800 u32 reorder_data, u8 baid) 801 { 802 unsigned long now = jiffies; 803 unsigned long timeout; 804 struct iwl_mvm_baid_data *data; 805 806 rcu_read_lock(); 807 808 data = rcu_dereference(mvm->baid_map[baid]); 809 if (!data) { 810 IWL_DEBUG_RX(mvm, 811 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n", 812 baid, reorder_data); 813 goto out; 814 } 815 816 if (!data->timeout) 817 goto out; 818 819 timeout = data->timeout; 820 /* 821 * Do not update last rx all the time to avoid cache bouncing 822 * between the rx queues. 823 * Update it every timeout. Worst case is the session will 824 * expire after ~ 2 * timeout, which doesn't matter that much. 825 */ 826 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 827 /* Update is atomic */ 828 data->last_rx = now; 829 830 out: 831 rcu_read_unlock(); 832 } 833 834 static void iwl_mvm_flip_address(u8 *addr) 835 { 836 int i; 837 u8 mac_addr[ETH_ALEN]; 838 839 for (i = 0; i < ETH_ALEN; i++) 840 mac_addr[i] = addr[ETH_ALEN - i - 1]; 841 ether_addr_copy(addr, mac_addr); 842 } 843 844 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 845 struct iwl_rx_cmd_buffer *rxb, int queue) 846 { 847 struct ieee80211_rx_status *rx_status; 848 struct iwl_rx_packet *pkt = rxb_addr(rxb); 849 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 850 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 851 u32 len = le16_to_cpu(desc->mpdu_len); 852 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 853 u16 phy_info = le16_to_cpu(desc->phy_info); 854 struct ieee80211_sta *sta = NULL; 855 struct sk_buff *skb; 856 u8 crypt_len = 0; 857 858 if (unlikely(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))) 859 return; 860 861 /* Dont use dev_alloc_skb(), we'll have enough headroom once 862 * ieee80211_hdr pulled. 863 */ 864 skb = alloc_skb(128, GFP_ATOMIC); 865 if (!skb) { 866 IWL_ERR(mvm, "alloc_skb failed\n"); 867 return; 868 } 869 870 rx_status = IEEE80211_SKB_RXCB(skb); 871 872 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, 873 le32_to_cpu(pkt->len_n_flags), queue, 874 &crypt_len)) { 875 kfree_skb(skb); 876 return; 877 } 878 879 /* 880 * Keep packets with CRC errors (and with overrun) for monitor mode 881 * (otherwise the firmware discards them) but mark them as bad. 882 */ 883 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 884 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 885 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 886 le16_to_cpu(desc->status)); 887 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 888 } 889 /* set the preamble flag if appropriate */ 890 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) 891 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE; 892 893 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { 894 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 895 /* TSF as indicated by the firmware is at INA time */ 896 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 897 } 898 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 899 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 900 NL80211_BAND_2GHZ; 901 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 902 rx_status->band); 903 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 904 905 /* update aggregation data for monitor sake on default queue */ 906 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { 907 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; 908 909 rx_status->flag |= RX_FLAG_AMPDU_DETAILS; 910 rx_status->ampdu_reference = mvm->ampdu_ref; 911 /* toggle is switched whenever new aggregation starts */ 912 if (toggle_bit != mvm->ampdu_toggle) { 913 mvm->ampdu_ref++; 914 mvm->ampdu_toggle = toggle_bit; 915 } 916 } 917 918 rcu_read_lock(); 919 920 if (desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_SRC_STA_FOUND)) { 921 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 922 923 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) { 924 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 925 if (IS_ERR(sta)) 926 sta = NULL; 927 } 928 } else if (!is_multicast_ether_addr(hdr->addr2)) { 929 /* 930 * This is fine since we prevent two stations with the same 931 * address from being added. 932 */ 933 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 934 } 935 936 if (sta) { 937 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 938 struct ieee80211_vif *tx_blocked_vif = 939 rcu_dereference(mvm->csa_tx_blocked_vif); 940 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 941 IWL_RX_MPDU_REORDER_BAID_MASK) >> 942 IWL_RX_MPDU_REORDER_BAID_SHIFT); 943 944 /* 945 * We have tx blocked stations (with CS bit). If we heard 946 * frames from a blocked station on a new channel we can 947 * TX to it again. 948 */ 949 if (unlikely(tx_blocked_vif) && 950 tx_blocked_vif == mvmsta->vif) { 951 struct iwl_mvm_vif *mvmvif = 952 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 953 954 if (mvmvif->csa_target_freq == rx_status->freq) 955 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, 956 false); 957 } 958 959 rs_update_last_rssi(mvm, mvmsta, rx_status); 960 961 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 962 ieee80211_is_beacon(hdr->frame_control)) { 963 struct iwl_fw_dbg_trigger_tlv *trig; 964 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 965 bool trig_check; 966 s32 rssi; 967 968 trig = iwl_fw_dbg_get_trigger(mvm->fw, 969 FW_DBG_TRIGGER_RSSI); 970 rssi_trig = (void *)trig->data; 971 rssi = le32_to_cpu(rssi_trig->rssi); 972 973 trig_check = 974 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, 975 ieee80211_vif_to_wdev(mvmsta->vif), 976 trig); 977 if (trig_check && rx_status->signal < rssi) 978 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, 979 NULL); 980 } 981 982 if (ieee80211_is_data(hdr->frame_control)) 983 iwl_mvm_rx_csum(sta, skb, desc); 984 985 if (iwl_mvm_is_dup(sta, queue, rx_status, hdr, desc)) { 986 kfree_skb(skb); 987 goto out; 988 } 989 990 /* 991 * Our hardware de-aggregates AMSDUs but copies the mac header 992 * as it to the de-aggregated MPDUs. We need to turn off the 993 * AMSDU bit in the QoS control ourselves. 994 * In addition, HW reverses addr3 and addr4 - reverse it back. 995 */ 996 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 997 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 998 u8 *qc = ieee80211_get_qos_ctl(hdr); 999 1000 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 1001 1002 if (mvm->trans->cfg->device_family == 1003 IWL_DEVICE_FAMILY_9000) { 1004 iwl_mvm_flip_address(hdr->addr3); 1005 1006 if (ieee80211_has_a4(hdr->frame_control)) 1007 iwl_mvm_flip_address(hdr->addr4); 1008 } 1009 } 1010 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) { 1011 u32 reorder_data = le32_to_cpu(desc->reorder_data); 1012 1013 iwl_mvm_agg_rx_received(mvm, reorder_data, baid); 1014 } 1015 } 1016 1017 /* Set up the HT phy flags */ 1018 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 1019 case RATE_MCS_CHAN_WIDTH_20: 1020 break; 1021 case RATE_MCS_CHAN_WIDTH_40: 1022 rx_status->bw = RATE_INFO_BW_40; 1023 break; 1024 case RATE_MCS_CHAN_WIDTH_80: 1025 rx_status->bw = RATE_INFO_BW_80; 1026 break; 1027 case RATE_MCS_CHAN_WIDTH_160: 1028 rx_status->bw = RATE_INFO_BW_160; 1029 break; 1030 } 1031 1032 if (!(rate_n_flags & RATE_MCS_CCK_MSK) && 1033 rate_n_flags & RATE_MCS_SGI_MSK) 1034 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI; 1035 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 1036 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF; 1037 if (rate_n_flags & RATE_MCS_LDPC_MSK) 1038 rx_status->enc_flags |= RX_ENC_FLAG_LDPC; 1039 if (rate_n_flags & RATE_MCS_HT_MSK) { 1040 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 1041 RATE_MCS_STBC_POS; 1042 rx_status->encoding = RX_ENC_HT; 1043 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 1044 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 1045 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 1046 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >> 1047 RATE_MCS_STBC_POS; 1048 rx_status->nss = 1049 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 1050 RATE_VHT_MCS_NSS_POS) + 1; 1051 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 1052 rx_status->encoding = RX_ENC_VHT; 1053 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT; 1054 if (rate_n_flags & RATE_MCS_BF_MSK) 1055 rx_status->enc_flags |= RX_ENC_FLAG_BF; 1056 } else { 1057 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 1058 rx_status->band); 1059 1060 if (WARN(rate < 0 || rate > 0xFF, 1061 "Invalid rate flags 0x%x, band %d,\n", 1062 rate_n_flags, rx_status->band)) { 1063 kfree_skb(skb); 1064 goto out; 1065 } 1066 rx_status->rate_idx = rate; 1067 1068 } 1069 1070 /* management stuff on default queue */ 1071 if (!queue) { 1072 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 1073 ieee80211_is_probe_resp(hdr->frame_control)) && 1074 mvm->sched_scan_pass_all == 1075 SCHED_SCAN_PASS_ALL_ENABLED)) 1076 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 1077 1078 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 1079 ieee80211_is_probe_resp(hdr->frame_control))) 1080 rx_status->boottime_ns = ktime_get_boot_ns(); 1081 } 1082 1083 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 1084 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 1085 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 1086 out: 1087 rcu_read_unlock(); 1088 } 1089 1090 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 1091 struct iwl_rx_cmd_buffer *rxb, int queue) 1092 { 1093 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1094 struct iwl_frame_release *release = (void *)pkt->data; 1095 struct ieee80211_sta *sta; 1096 struct iwl_mvm_reorder_buffer *reorder_buf; 1097 struct iwl_mvm_baid_data *ba_data; 1098 1099 int baid = release->baid; 1100 1101 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 1102 release->baid, le16_to_cpu(release->nssn)); 1103 1104 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 1105 return; 1106 1107 rcu_read_lock(); 1108 1109 ba_data = rcu_dereference(mvm->baid_map[baid]); 1110 if (WARN_ON_ONCE(!ba_data)) 1111 goto out; 1112 1113 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 1114 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 1115 goto out; 1116 1117 reorder_buf = &ba_data->reorder_buf[queue]; 1118 1119 spin_lock_bh(&reorder_buf->lock); 1120 iwl_mvm_release_frames(mvm, sta, napi, ba_data, reorder_buf, 1121 le16_to_cpu(release->nssn)); 1122 spin_unlock_bh(&reorder_buf->lock); 1123 1124 out: 1125 rcu_read_unlock(); 1126 } 1127