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