1 /****************************************************************************** 2 * 3 * This file is provided under a dual BSD/GPLv2 license. When using or 4 * redistributing this file, you may do so under either license. 5 * 6 * GPL LICENSE SUMMARY 7 * 8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 10 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of version 2 of the GNU General Public License as 14 * published by the Free Software Foundation. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * The full GNU General Public License is included in this distribution 22 * in the file called COPYING. 23 * 24 * Contact Information: 25 * Intel Linux Wireless <ilw@linux.intel.com> 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 27 * 28 * BSD LICENSE 29 * 30 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 31 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 32 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH 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 void iwl_mvm_rx_phy_cmd_mq(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb) 69 { 70 mvm->ampdu_ref++; 71 72 #ifdef CONFIG_IWLWIFI_DEBUGFS 73 if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) { 74 spin_lock(&mvm->drv_stats_lock); 75 mvm->drv_rx_stats.ampdu_count++; 76 spin_unlock(&mvm->drv_stats_lock); 77 } 78 #endif 79 } 80 81 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb, 82 int queue, struct ieee80211_sta *sta) 83 { 84 struct iwl_mvm_sta *mvmsta; 85 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 86 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb); 87 struct iwl_mvm_key_pn *ptk_pn; 88 u8 tid, keyidx; 89 u8 pn[IEEE80211_CCMP_PN_LEN]; 90 u8 *extiv; 91 92 /* do PN checking */ 93 94 /* multicast and non-data only arrives on default queue */ 95 if (!ieee80211_is_data(hdr->frame_control) || 96 is_multicast_ether_addr(hdr->addr1)) 97 return 0; 98 99 /* do not check PN for open AP */ 100 if (!(stats->flag & RX_FLAG_DECRYPTED)) 101 return 0; 102 103 /* 104 * avoid checking for default queue - we don't want to replicate 105 * all the logic that's necessary for checking the PN on fragmented 106 * frames, leave that to mac80211 107 */ 108 if (queue == 0) 109 return 0; 110 111 /* if we are here - this for sure is either CCMP or GCMP */ 112 if (IS_ERR_OR_NULL(sta)) { 113 IWL_ERR(mvm, 114 "expected hw-decrypted unicast frame for station\n"); 115 return -1; 116 } 117 118 mvmsta = iwl_mvm_sta_from_mac80211(sta); 119 120 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control); 121 keyidx = extiv[3] >> 6; 122 123 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]); 124 if (!ptk_pn) 125 return -1; 126 127 if (ieee80211_is_data_qos(hdr->frame_control)) 128 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 129 else 130 tid = 0; 131 132 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */ 133 if (tid >= IWL_MAX_TID_COUNT) 134 return -1; 135 136 /* load pn */ 137 pn[0] = extiv[7]; 138 pn[1] = extiv[6]; 139 pn[2] = extiv[5]; 140 pn[3] = extiv[4]; 141 pn[4] = extiv[1]; 142 pn[5] = extiv[0]; 143 144 if (memcmp(pn, ptk_pn->q[queue].pn[tid], 145 IEEE80211_CCMP_PN_LEN) <= 0) 146 return -1; 147 148 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN); 149 stats->flag |= RX_FLAG_PN_VALIDATED; 150 151 return 0; 152 } 153 154 /* iwl_mvm_create_skb Adds the rxb to a new skb */ 155 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr, 156 u16 len, u8 crypt_len, 157 struct iwl_rx_cmd_buffer *rxb) 158 { 159 struct iwl_rx_packet *pkt = rxb_addr(rxb); 160 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 161 unsigned int headlen, fraglen, pad_len = 0; 162 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); 163 164 if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) 165 pad_len = 2; 166 len -= pad_len; 167 168 /* If frame is small enough to fit in skb->head, pull it completely. 169 * If not, only pull ieee80211_hdr (including crypto if present, and 170 * an additional 8 bytes for SNAP/ethertype, see below) so that 171 * splice() or TCP coalesce are more efficient. 172 * 173 * Since, in addition, ieee80211_data_to_8023() always pull in at 174 * least 8 bytes (possibly more for mesh) we can do the same here 175 * to save the cost of doing it later. That still doesn't pull in 176 * the actual IP header since the typical case has a SNAP header. 177 * If the latter changes (there are efforts in the standards group 178 * to do so) we should revisit this and ieee80211_data_to_8023(). 179 */ 180 headlen = (len <= skb_tailroom(skb)) ? len : 181 hdrlen + crypt_len + 8; 182 183 /* The firmware may align the packet to DWORD. 184 * The padding is inserted after the IV. 185 * After copying the header + IV skip the padding if 186 * present before copying packet data. 187 */ 188 hdrlen += crypt_len; 189 memcpy(skb_put(skb, hdrlen), hdr, hdrlen); 190 memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len, 191 headlen - hdrlen); 192 193 fraglen = len - headlen; 194 195 if (fraglen) { 196 int offset = (void *)hdr + headlen + pad_len - 197 rxb_addr(rxb) + rxb_offset(rxb); 198 199 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 200 fraglen, rxb->truesize); 201 } 202 } 203 204 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ 205 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, 206 struct napi_struct *napi, 207 struct sk_buff *skb, int queue, 208 struct ieee80211_sta *sta) 209 { 210 if (iwl_mvm_check_pn(mvm, skb, queue, sta)) 211 kfree_skb(skb); 212 else 213 ieee80211_rx_napi(mvm->hw, sta, skb, napi); 214 } 215 216 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 217 struct iwl_rx_mpdu_desc *desc, 218 struct ieee80211_rx_status *rx_status) 219 { 220 int energy_a, energy_b, max_energy; 221 222 energy_a = desc->energy_a; 223 energy_a = energy_a ? -energy_a : S8_MIN; 224 energy_b = desc->energy_b; 225 energy_b = energy_b ? -energy_b : S8_MIN; 226 max_energy = max(energy_a, energy_b); 227 228 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", 229 energy_a, energy_b, max_energy); 230 231 rx_status->signal = max_energy; 232 rx_status->chains = 0; /* TODO: phy info */ 233 rx_status->chain_signal[0] = energy_a; 234 rx_status->chain_signal[1] = energy_b; 235 rx_status->chain_signal[2] = S8_MIN; 236 } 237 238 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, 239 struct ieee80211_rx_status *stats, 240 struct iwl_rx_mpdu_desc *desc, int queue, 241 u8 *crypt_len) 242 { 243 u16 status = le16_to_cpu(desc->status); 244 245 if (!ieee80211_has_protected(hdr->frame_control) || 246 (status & IWL_RX_MPDU_STATUS_SEC_MASK) == 247 IWL_RX_MPDU_STATUS_SEC_NONE) 248 return 0; 249 250 /* TODO: handle packets encrypted with unknown alg */ 251 252 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { 253 case IWL_RX_MPDU_STATUS_SEC_CCM: 254 case IWL_RX_MPDU_STATUS_SEC_GCM: 255 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); 256 /* alg is CCM: check MIC only */ 257 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 258 return -1; 259 260 stats->flag |= RX_FLAG_DECRYPTED; 261 *crypt_len = IEEE80211_CCMP_HDR_LEN; 262 return 0; 263 case IWL_RX_MPDU_STATUS_SEC_TKIP: 264 /* Don't drop the frame and decrypt it in SW */ 265 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) 266 return 0; 267 268 *crypt_len = IEEE80211_TKIP_IV_LEN; 269 /* fall through if TTAK OK */ 270 case IWL_RX_MPDU_STATUS_SEC_WEP: 271 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) 272 return -1; 273 274 stats->flag |= RX_FLAG_DECRYPTED; 275 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == 276 IWL_RX_MPDU_STATUS_SEC_WEP) 277 *crypt_len = IEEE80211_WEP_IV_LEN; 278 return 0; 279 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: 280 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 281 return -1; 282 stats->flag |= RX_FLAG_DECRYPTED; 283 return 0; 284 default: 285 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); 286 } 287 288 return 0; 289 } 290 291 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, 292 struct sk_buff *skb, 293 struct iwl_rx_mpdu_desc *desc) 294 { 295 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 296 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 297 u16 flags = le16_to_cpu(desc->l3l4_flags); 298 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> 299 IWL_RX_L3_PROTO_POS); 300 301 if (mvmvif->features & NETIF_F_RXCSUM && 302 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && 303 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || 304 l3_prot == IWL_RX_L3_TYPE_IPV6 || 305 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) 306 skb->ip_summed = CHECKSUM_UNNECESSARY; 307 } 308 309 /* 310 * returns true if a packet outside BA session is a duplicate and 311 * should be dropped 312 */ 313 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, 314 struct ieee80211_rx_status *rx_status, 315 struct ieee80211_hdr *hdr, 316 struct iwl_rx_mpdu_desc *desc) 317 { 318 struct iwl_mvm_sta *mvm_sta; 319 struct iwl_mvm_rxq_dup_data *dup_data; 320 u8 baid, tid, sub_frame_idx; 321 322 if (WARN_ON(IS_ERR_OR_NULL(sta))) 323 return false; 324 325 baid = (le32_to_cpu(desc->reorder_data) & 326 IWL_RX_MPDU_REORDER_BAID_MASK) >> 327 IWL_RX_MPDU_REORDER_BAID_SHIFT; 328 329 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 330 return false; 331 332 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 333 dup_data = &mvm_sta->dup_data[queue]; 334 335 /* 336 * Drop duplicate 802.11 retransmissions 337 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 338 */ 339 if (ieee80211_is_ctl(hdr->frame_control) || 340 ieee80211_is_qos_nullfunc(hdr->frame_control) || 341 is_multicast_ether_addr(hdr->addr1)) { 342 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 343 return false; 344 } 345 346 if (ieee80211_is_data_qos(hdr->frame_control)) 347 /* frame has qos control */ 348 tid = *ieee80211_get_qos_ctl(hdr) & 349 IEEE80211_QOS_CTL_TID_MASK; 350 else 351 tid = IWL_MAX_TID_COUNT; 352 353 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ 354 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 355 356 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 357 dup_data->last_seq[tid] == hdr->seq_ctrl && 358 dup_data->last_sub_frame[tid] >= sub_frame_idx)) 359 return true; 360 361 dup_data->last_seq[tid] = hdr->seq_ctrl; 362 dup_data->last_sub_frame[tid] = sub_frame_idx; 363 364 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 365 366 return false; 367 } 368 369 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, 370 const u8 *data, u32 count) 371 { 372 struct iwl_rxq_sync_cmd *cmd; 373 u32 data_size = sizeof(*cmd) + count; 374 int ret; 375 376 /* should be DWORD aligned */ 377 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) 378 return -EINVAL; 379 380 cmd = kzalloc(data_size, GFP_KERNEL); 381 if (!cmd) 382 return -ENOMEM; 383 384 cmd->rxq_mask = cpu_to_le32(rxq_mask); 385 cmd->count = cpu_to_le32(count); 386 cmd->flags = 0; 387 memcpy(cmd->payload, data, count); 388 389 ret = iwl_mvm_send_cmd_pdu(mvm, 390 WIDE_ID(DATA_PATH_GROUP, 391 TRIGGER_RX_QUEUES_NOTIF_CMD), 392 0, data_size, cmd); 393 394 kfree(cmd); 395 return ret; 396 } 397 398 /* 399 * Returns true if sn2 - buffer_size < sn1 < sn2. 400 * To be used only in order to compare reorder buffer head with NSSN. 401 * We fully trust NSSN unless it is behind us due to reorder timeout. 402 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. 403 */ 404 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) 405 { 406 return ieee80211_sn_less(sn1, sn2) && 407 !ieee80211_sn_less(sn1, sn2 - buffer_size); 408 } 409 410 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10) 411 412 static void iwl_mvm_release_frames(struct iwl_mvm *mvm, 413 struct ieee80211_sta *sta, 414 struct napi_struct *napi, 415 struct iwl_mvm_reorder_buffer *reorder_buf, 416 u16 nssn) 417 { 418 u16 ssn = reorder_buf->head_sn; 419 420 lockdep_assert_held(&reorder_buf->lock); 421 422 /* ignore nssn smaller than head sn - this can happen due to timeout */ 423 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 424 return; 425 426 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 427 int index = ssn % reorder_buf->buf_size; 428 struct sk_buff_head *skb_list = &reorder_buf->entries[index]; 429 struct sk_buff *skb; 430 431 ssn = ieee80211_sn_inc(ssn); 432 433 /* holes are valid since nssn indicates frames were received. */ 434 if (skb_queue_empty(skb_list) || !skb_peek_tail(skb_list)) 435 continue; 436 /* Empty the list. Will have more than one frame for A-MSDU */ 437 while ((skb = __skb_dequeue(skb_list))) { 438 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 439 reorder_buf->queue, 440 sta); 441 reorder_buf->num_stored--; 442 } 443 } 444 reorder_buf->head_sn = nssn; 445 446 if (reorder_buf->num_stored && !reorder_buf->removed) { 447 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 448 449 while (!skb_peek_tail(&reorder_buf->entries[index])) 450 index = (index + 1) % reorder_buf->buf_size; 451 /* modify timer to match next frame's expiration time */ 452 mod_timer(&reorder_buf->reorder_timer, 453 reorder_buf->reorder_time[index] + 1 + 454 RX_REORDER_BUF_TIMEOUT_MQ); 455 } else { 456 del_timer(&reorder_buf->reorder_timer); 457 } 458 } 459 460 void iwl_mvm_reorder_timer_expired(unsigned long data) 461 { 462 struct iwl_mvm_reorder_buffer *buf = (void *)data; 463 int i; 464 u16 sn = 0, index = 0; 465 bool expired = false; 466 467 spin_lock_bh(&buf->lock); 468 469 if (!buf->num_stored || buf->removed) { 470 spin_unlock_bh(&buf->lock); 471 return; 472 } 473 474 for (i = 0; i < buf->buf_size ; i++) { 475 index = (buf->head_sn + i) % buf->buf_size; 476 477 if (!skb_peek_tail(&buf->entries[index])) 478 continue; 479 if (!time_after(jiffies, buf->reorder_time[index] + 480 RX_REORDER_BUF_TIMEOUT_MQ)) 481 break; 482 expired = true; 483 sn = ieee80211_sn_add(buf->head_sn, i + 1); 484 } 485 486 if (expired) { 487 struct ieee80211_sta *sta; 488 489 rcu_read_lock(); 490 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); 491 /* SN is set to the last expired frame + 1 */ 492 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); 493 rcu_read_unlock(); 494 } else if (buf->num_stored) { 495 /* 496 * If no frame expired and there are stored frames, index is now 497 * pointing to the first unexpired frame - modify timer 498 * accordingly to this frame. 499 */ 500 mod_timer(&buf->reorder_timer, 501 buf->reorder_time[index] + 502 1 + RX_REORDER_BUF_TIMEOUT_MQ); 503 } 504 spin_unlock_bh(&buf->lock); 505 } 506 507 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 508 struct iwl_mvm_delba_data *data) 509 { 510 struct iwl_mvm_baid_data *ba_data; 511 struct ieee80211_sta *sta; 512 struct iwl_mvm_reorder_buffer *reorder_buf; 513 u8 baid = data->baid; 514 515 if (WARN_ON_ONCE(baid >= IWL_RX_REORDER_DATA_INVALID_BAID)) 516 return; 517 518 rcu_read_lock(); 519 520 ba_data = rcu_dereference(mvm->baid_map[baid]); 521 if (WARN_ON_ONCE(!ba_data)) 522 goto out; 523 524 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 525 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 526 goto out; 527 528 reorder_buf = &ba_data->reorder_buf[queue]; 529 530 /* release all frames that are in the reorder buffer to the stack */ 531 spin_lock_bh(&reorder_buf->lock); 532 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, 533 ieee80211_sn_add(reorder_buf->head_sn, 534 reorder_buf->buf_size)); 535 spin_unlock_bh(&reorder_buf->lock); 536 del_timer_sync(&reorder_buf->reorder_timer); 537 538 out: 539 rcu_read_unlock(); 540 } 541 542 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 543 int queue) 544 { 545 struct iwl_rx_packet *pkt = rxb_addr(rxb); 546 struct iwl_rxq_sync_notification *notif; 547 struct iwl_mvm_internal_rxq_notif *internal_notif; 548 549 notif = (void *)pkt->data; 550 internal_notif = (void *)notif->payload; 551 552 if (internal_notif->sync) { 553 if (mvm->queue_sync_cookie != internal_notif->cookie) { 554 WARN_ONCE(1, 555 "Received expired RX queue sync message\n"); 556 return; 557 } 558 atomic_dec(&mvm->queue_sync_counter); 559 } 560 561 switch (internal_notif->type) { 562 case IWL_MVM_RXQ_EMPTY: 563 break; 564 case IWL_MVM_RXQ_NOTIF_DEL_BA: 565 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 566 break; 567 default: 568 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 569 } 570 } 571 572 /* 573 * Returns true if the MPDU was buffered\dropped, false if it should be passed 574 * to upper layer. 575 */ 576 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 577 struct napi_struct *napi, 578 int queue, 579 struct ieee80211_sta *sta, 580 struct sk_buff *skb, 581 struct iwl_rx_mpdu_desc *desc) 582 { 583 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 584 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 585 struct iwl_mvm_baid_data *baid_data; 586 struct iwl_mvm_reorder_buffer *buffer; 587 struct sk_buff *tail; 588 u32 reorder = le32_to_cpu(desc->reorder_data); 589 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 590 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 591 u8 sub_frame_idx = desc->amsdu_info & 592 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 593 int index; 594 u16 nssn, sn; 595 u8 baid; 596 597 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 598 IWL_RX_MPDU_REORDER_BAID_SHIFT; 599 600 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 601 return false; 602 603 /* no sta yet */ 604 if (WARN_ON(IS_ERR_OR_NULL(sta))) 605 return false; 606 607 /* not a data packet */ 608 if (!ieee80211_is_data_qos(hdr->frame_control) || 609 is_multicast_ether_addr(hdr->addr1)) 610 return false; 611 612 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 613 return false; 614 615 baid_data = rcu_dereference(mvm->baid_map[baid]); 616 if (WARN(!baid_data, 617 "Received baid %d, but no data exists for this BAID\n", baid)) 618 return false; 619 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 620 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 621 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 622 tid)) 623 return false; 624 625 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 626 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 627 IWL_RX_MPDU_REORDER_SN_SHIFT; 628 629 buffer = &baid_data->reorder_buf[queue]; 630 631 spin_lock_bh(&buffer->lock); 632 633 /* 634 * If there was a significant jump in the nssn - adjust. 635 * If the SN is smaller than the NSSN it might need to first go into 636 * the reorder buffer, in which case we just release up to it and the 637 * rest of the function will take of storing it and releasing up to the 638 * nssn 639 */ 640 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 641 buffer->buf_size)) { 642 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 643 644 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); 645 } 646 647 /* drop any oudated packets */ 648 if (ieee80211_sn_less(sn, buffer->head_sn)) 649 goto drop; 650 651 /* release immediately if allowed by nssn and no stored frames */ 652 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 653 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 654 buffer->buf_size)) 655 buffer->head_sn = nssn; 656 /* No need to update AMSDU last SN - we are moving the head */ 657 spin_unlock_bh(&buffer->lock); 658 return false; 659 } 660 661 index = sn % buffer->buf_size; 662 663 /* 664 * Check if we already stored this frame 665 * As AMSDU is either received or not as whole, logic is simple: 666 * If we have frames in that position in the buffer and the last frame 667 * originated from AMSDU had a different SN then it is a retransmission. 668 * If it is the same SN then if the subframe index is incrementing it 669 * is the same AMSDU - otherwise it is a retransmission. 670 */ 671 tail = skb_peek_tail(&buffer->entries[index]); 672 if (tail && !amsdu) 673 goto drop; 674 else if (tail && (sn != buffer->last_amsdu || 675 buffer->last_sub_index >= sub_frame_idx)) 676 goto drop; 677 678 /* put in reorder buffer */ 679 __skb_queue_tail(&buffer->entries[index], skb); 680 buffer->num_stored++; 681 buffer->reorder_time[index] = jiffies; 682 683 if (amsdu) { 684 buffer->last_amsdu = sn; 685 buffer->last_sub_index = sub_frame_idx; 686 } 687 688 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 689 spin_unlock_bh(&buffer->lock); 690 return true; 691 692 drop: 693 kfree_skb(skb); 694 spin_unlock_bh(&buffer->lock); 695 return true; 696 } 697 698 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid) 699 { 700 unsigned long now = jiffies; 701 unsigned long timeout; 702 struct iwl_mvm_baid_data *data; 703 704 rcu_read_lock(); 705 706 data = rcu_dereference(mvm->baid_map[baid]); 707 if (WARN_ON(!data)) 708 goto out; 709 710 if (!data->timeout) 711 goto out; 712 713 timeout = data->timeout; 714 /* 715 * Do not update last rx all the time to avoid cache bouncing 716 * between the rx queues. 717 * Update it every timeout. Worst case is the session will 718 * expire after ~ 2 * timeout, which doesn't matter that much. 719 */ 720 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 721 /* Update is atomic */ 722 data->last_rx = now; 723 724 out: 725 rcu_read_unlock(); 726 } 727 728 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 729 struct iwl_rx_cmd_buffer *rxb, int queue) 730 { 731 struct ieee80211_rx_status *rx_status; 732 struct iwl_rx_packet *pkt = rxb_addr(rxb); 733 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 734 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 735 u32 len = le16_to_cpu(desc->mpdu_len); 736 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 737 struct ieee80211_sta *sta = NULL; 738 struct sk_buff *skb; 739 u8 crypt_len = 0; 740 741 /* Dont use dev_alloc_skb(), we'll have enough headroom once 742 * ieee80211_hdr pulled. 743 */ 744 skb = alloc_skb(128, GFP_ATOMIC); 745 if (!skb) { 746 IWL_ERR(mvm, "alloc_skb failed\n"); 747 return; 748 } 749 750 rx_status = IEEE80211_SKB_RXCB(skb); 751 752 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { 753 kfree_skb(skb); 754 return; 755 } 756 757 /* 758 * Keep packets with CRC errors (and with overrun) for monitor mode 759 * (otherwise the firmware discards them) but mark them as bad. 760 */ 761 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 762 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 763 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 764 le16_to_cpu(desc->status)); 765 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 766 } 767 768 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 769 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 770 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 771 NL80211_BAND_2GHZ; 772 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 773 rx_status->band); 774 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 775 /* TSF as indicated by the firmware is at INA time */ 776 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 777 778 rcu_read_lock(); 779 780 if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) { 781 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 782 783 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) { 784 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 785 if (IS_ERR(sta)) 786 sta = NULL; 787 } 788 } else if (!is_multicast_ether_addr(hdr->addr2)) { 789 /* 790 * This is fine since we prevent two stations with the same 791 * address from being added. 792 */ 793 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 794 } 795 796 if (sta) { 797 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 798 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 799 IWL_RX_MPDU_REORDER_BAID_MASK) >> 800 IWL_RX_MPDU_REORDER_BAID_SHIFT); 801 802 /* 803 * We have tx blocked stations (with CS bit). If we heard 804 * frames from a blocked station on a new channel we can 805 * TX to it again. 806 */ 807 if (unlikely(mvm->csa_tx_block_bcn_timeout)) 808 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false); 809 810 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); 811 812 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 813 ieee80211_is_beacon(hdr->frame_control)) { 814 struct iwl_fw_dbg_trigger_tlv *trig; 815 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 816 bool trig_check; 817 s32 rssi; 818 819 trig = iwl_fw_dbg_get_trigger(mvm->fw, 820 FW_DBG_TRIGGER_RSSI); 821 rssi_trig = (void *)trig->data; 822 rssi = le32_to_cpu(rssi_trig->rssi); 823 824 trig_check = 825 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif, 826 trig); 827 if (trig_check && rx_status->signal < rssi) 828 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL); 829 } 830 831 /* TODO: multi queue TCM */ 832 833 if (ieee80211_is_data(hdr->frame_control)) 834 iwl_mvm_rx_csum(sta, skb, desc); 835 836 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 837 kfree_skb(skb); 838 rcu_read_unlock(); 839 return; 840 } 841 842 /* 843 * Our hardware de-aggregates AMSDUs but copies the mac header 844 * as it to the de-aggregated MPDUs. We need to turn off the 845 * AMSDU bit in the QoS control ourselves. 846 */ 847 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 848 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 849 u8 *qc = ieee80211_get_qos_ctl(hdr); 850 851 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 852 } 853 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 854 iwl_mvm_agg_rx_received(mvm, baid); 855 } 856 857 /* 858 * TODO: PHY info. 859 * Verify we don't have the information in the MPDU descriptor and 860 * that it is not needed. 861 * Make sure for monitor mode that we are on default queue, update 862 * ampdu_ref and the rest of phy info then 863 */ 864 865 /* Set up the HT phy flags */ 866 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 867 case RATE_MCS_CHAN_WIDTH_20: 868 break; 869 case RATE_MCS_CHAN_WIDTH_40: 870 rx_status->flag |= RX_FLAG_40MHZ; 871 break; 872 case RATE_MCS_CHAN_WIDTH_80: 873 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ; 874 break; 875 case RATE_MCS_CHAN_WIDTH_160: 876 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ; 877 break; 878 } 879 if (rate_n_flags & RATE_MCS_SGI_MSK) 880 rx_status->flag |= RX_FLAG_SHORT_GI; 881 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 882 rx_status->flag |= RX_FLAG_HT_GF; 883 if (rate_n_flags & RATE_MCS_LDPC_MSK) 884 rx_status->flag |= RX_FLAG_LDPC; 885 if (rate_n_flags & RATE_MCS_HT_MSK) { 886 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >> 887 RATE_MCS_STBC_POS; 888 rx_status->flag |= RX_FLAG_HT; 889 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 890 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; 891 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 892 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >> 893 RATE_MCS_STBC_POS; 894 rx_status->vht_nss = 895 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 896 RATE_VHT_MCS_NSS_POS) + 1; 897 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 898 rx_status->flag |= RX_FLAG_VHT; 899 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; 900 if (rate_n_flags & RATE_MCS_BF_MSK) 901 rx_status->vht_flag |= RX_VHT_FLAG_BF; 902 } else { 903 rx_status->rate_idx = 904 iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 905 rx_status->band); 906 } 907 908 /* TODO: PHY info - update ampdu queue statistics (for debugfs) */ 909 /* TODO: PHY info - gscan */ 910 911 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 912 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 913 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 914 rcu_read_unlock(); 915 } 916 917 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 918 struct iwl_rx_cmd_buffer *rxb, int queue) 919 { 920 struct iwl_rx_packet *pkt = rxb_addr(rxb); 921 struct iwl_frame_release *release = (void *)pkt->data; 922 struct ieee80211_sta *sta; 923 struct iwl_mvm_reorder_buffer *reorder_buf; 924 struct iwl_mvm_baid_data *ba_data; 925 926 int baid = release->baid; 927 928 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 929 return; 930 931 rcu_read_lock(); 932 933 ba_data = rcu_dereference(mvm->baid_map[baid]); 934 if (WARN_ON_ONCE(!ba_data)) 935 goto out; 936 937 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 938 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 939 goto out; 940 941 reorder_buf = &ba_data->reorder_buf[queue]; 942 943 spin_lock_bh(&reorder_buf->lock); 944 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, 945 le16_to_cpu(release->nssn)); 946 spin_unlock_bh(&reorder_buf->lock); 947 948 out: 949 rcu_read_unlock(); 950 } 951