drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2015 - 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  *
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  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  *
  39  *  * Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  *  * Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in
  43  *    the documentation and/or other materials provided with the
  44  *    distribution.
  45  *  * Neither the name Intel Corporation nor the names of its
  46  *    contributors may be used to endorse or promote products derived
  47  *    from this software without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  50  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  51  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  52  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  53  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  54  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  55  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  59  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  *****************************************************************************/
  61 #include <linux/etherdevice.h>
  62 #include <linux/skbuff.h>
  63 #include "iwl-trans.h"
  64 #include "mvm.h"
  65 #include "fw-api.h"
  66 #include "fw-dbg.h"
  67
  68 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
  69                                    int queue, struct ieee80211_sta *sta)
  70 {
  71         struct iwl_mvm_sta *mvmsta;
  72         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  73         struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
  74         struct iwl_mvm_key_pn *ptk_pn;
  75         u8 tid, keyidx;
  76         u8 pn[IEEE80211_CCMP_PN_LEN];
  77         u8 *extiv;
  78
  79         /* do PN checking */
  80
  81         /* multicast and non-data only arrives on default queue */
  82         if (!ieee80211_is_data(hdr->frame_control) ||
  83             is_multicast_ether_addr(hdr->addr1))
  84                 return 0;
  85
  86         /* do not check PN for open AP */
  87         if (!(stats->flag & RX_FLAG_DECRYPTED))
  88                 return 0;
  89
  90         /*
  91          * avoid checking for default queue - we don't want to replicate
  92          * all the logic that's necessary for checking the PN on fragmented
  93          * frames, leave that to mac80211
  94          */
  95         if (queue == 0)
  96                 return 0;
  97
  98         /* if we are here - this for sure is either CCMP or GCMP */
  99         if (IS_ERR_OR_NULL(sta)) {
 100                 IWL_ERR(mvm,
 101                         "expected hw-decrypted unicast frame for station\n");
 102                 return -1;
 103         }
 104
 105         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 106
 107         extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
 108         keyidx = extiv[3] >> 6;
 109
 110         ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
 111         if (!ptk_pn)
 112                 return -1;
 113
 114         if (ieee80211_is_data_qos(hdr->frame_control))
 115                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 116         else
 117                 tid = 0;
 118
 119         /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
 120         if (tid >= IWL_MAX_TID_COUNT)
 121                 return -1;
 122
 123         /* load pn */
 124         pn[0] = extiv[7];
 125         pn[1] = extiv[6];
 126         pn[2] = extiv[5];
 127         pn[3] = extiv[4];
 128         pn[4] = extiv[1];
 129         pn[5] = extiv[0];
 130
 131         if (memcmp(pn, ptk_pn->q[queue].pn[tid],
 132                    IEEE80211_CCMP_PN_LEN) <= 0)
 133                 return -1;
 134
 135         if (!(stats->flag & RX_FLAG_AMSDU_MORE))
 136                 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
 137         stats->flag |= RX_FLAG_PN_VALIDATED;
 138
 139         return 0;
 140 }
 141
 142 /* iwl_mvm_create_skb Adds the rxb to a new skb */
 143 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
 144                                u16 len, u8 crypt_len,
 145                                struct iwl_rx_cmd_buffer *rxb)
 146 {
 147         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 148         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 149         unsigned int headlen, fraglen, pad_len = 0;
 150         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 151
 152         if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) {
 153                 pad_len = 2;
 154
 155                 /*
 156                  * If the device inserted padding it means that (it thought)
 157                  * the 802.11 header wasn't a multiple of 4 bytes long. In
 158                  * this case, reserve two bytes at the start of the SKB to
 159                  * align the payload properly in case we end up copying it.
 160                  */
 161                 skb_reserve(skb, pad_len);
 162         }
 163         len -= pad_len;
 164
 165         /* If frame is small enough to fit in skb->head, pull it completely.
 166          * If not, only pull ieee80211_hdr (including crypto if present, and
 167          * an additional 8 bytes for SNAP/ethertype, see below) so that
 168          * splice() or TCP coalesce are more efficient.
 169          *
 170          * Since, in addition, ieee80211_data_to_8023() always pull in at
 171          * least 8 bytes (possibly more for mesh) we can do the same here
 172          * to save the cost of doing it later. That still doesn't pull in
 173          * the actual IP header since the typical case has a SNAP header.
 174          * If the latter changes (there are efforts in the standards group
 175          * to do so) we should revisit this and ieee80211_data_to_8023().
 176          */
 177         headlen = (len <= skb_tailroom(skb)) ? len :
 178                                                hdrlen + crypt_len + 8;
 179
 180         /* The firmware may align the packet to DWORD.
 181          * The padding is inserted after the IV.
 182          * After copying the header + IV skip the padding if
 183          * present before copying packet data.
 184          */
 185         hdrlen += crypt_len;
 186         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 187         memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len,
 188                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
 219         energy_a = desc->energy_a;
 220         energy_a = energy_a ? -energy_a : S8_MIN;
 221         energy_b = desc->energy_b;
 222         energy_b = energy_b ? -energy_b : S8_MIN;
 223         max_energy = max(energy_a, energy_b);
 224
 225         IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
 226                         energy_a, energy_b, max_energy);
 227
 228         rx_status->signal = max_energy;
 229         rx_status->chains = 0; /* TODO: phy info */
 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, int queue,
 238                              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                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 259                 return 0;
 260         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 261                 /* Don't drop the frame and decrypt it in SW */
 262                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 263                         return 0;
 264
 265                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 266                 /* fall through if TTAK OK */
 267         case IWL_RX_MPDU_STATUS_SEC_WEP:
 268                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 269                         return -1;
 270
 271                 stats->flag |= RX_FLAG_DECRYPTED;
 272                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 273                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 274                         *crypt_len = IEEE80211_WEP_IV_LEN;
 275                 return 0;
 276         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 277                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 278                         return -1;
 279                 stats->flag |= RX_FLAG_DECRYPTED;
 280                 return 0;
 281         default:
 282                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 283         }
 284
 285         return 0;
 286 }
 287
 288 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 289                             struct sk_buff *skb,
 290                             struct iwl_rx_mpdu_desc *desc)
 291 {
 292         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 293         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 294         u16 flags = le16_to_cpu(desc->l3l4_flags);
 295         u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
 296                           IWL_RX_L3_PROTO_POS);
 297
 298         if (mvmvif->features & NETIF_F_RXCSUM &&
 299             flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
 300             (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
 301              l3_prot == IWL_RX_L3_TYPE_IPV6 ||
 302              l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
 303                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 304 }
 305
 306 /*
 307  * returns true if a packet outside BA session is a duplicate and
 308  * should be dropped
 309  */
 310 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
 311                                   struct ieee80211_rx_status *rx_status,
 312                                   struct ieee80211_hdr *hdr,
 313                                   struct iwl_rx_mpdu_desc *desc)
 314 {
 315         struct iwl_mvm_sta *mvm_sta;
 316         struct iwl_mvm_rxq_dup_data *dup_data;
 317         u8 baid, tid, sub_frame_idx;
 318
 319         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 320                 return false;
 321
 322         baid = (le32_to_cpu(desc->reorder_data) &
 323                 IWL_RX_MPDU_REORDER_BAID_MASK) >>
 324                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 325
 326         if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 327                 return false;
 328
 329         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 330         dup_data = &mvm_sta->dup_data[queue];
 331
 332         /*
 333          * Drop duplicate 802.11 retransmissions
 334          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 335          */
 336         if (ieee80211_is_ctl(hdr->frame_control) ||
 337             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
 338             is_multicast_ether_addr(hdr->addr1)) {
 339                 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 340                 return false;
 341         }
 342
 343         if (ieee80211_is_data_qos(hdr->frame_control))
 344                 /* frame has qos control */
 345                 tid = *ieee80211_get_qos_ctl(hdr) &
 346                         IEEE80211_QOS_CTL_TID_MASK;
 347         else
 348                 tid = IWL_MAX_TID_COUNT;
 349
 350         /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
 351         sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 352
 353         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 354                      dup_data->last_seq[tid] == hdr->seq_ctrl &&
 355                      dup_data->last_sub_frame[tid] >= sub_frame_idx))
 356                 return true;
 357
 358         dup_data->last_seq[tid] = hdr->seq_ctrl;
 359         dup_data->last_sub_frame[tid] = sub_frame_idx;
 360
 361         rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 362
 363         return false;
 364 }
 365
 366 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 367                             const u8 *data, u32 count)
 368 {
 369         struct iwl_rxq_sync_cmd *cmd;
 370         u32 data_size = sizeof(*cmd) + count;
 371         int ret;
 372
 373         /* should be DWORD aligned */
 374         if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
 375                 return -EINVAL;
 376
 377         cmd = kzalloc(data_size, GFP_KERNEL);
 378         if (!cmd)
 379                 return -ENOMEM;
 380
 381         cmd->rxq_mask = cpu_to_le32(rxq_mask);
 382         cmd->count =  cpu_to_le32(count);
 383         cmd->flags = 0;
 384         memcpy(cmd->payload, data, count);
 385
 386         ret = iwl_mvm_send_cmd_pdu(mvm,
 387                                    WIDE_ID(DATA_PATH_GROUP,
 388                                            TRIGGER_RX_QUEUES_NOTIF_CMD),
 389                                    0, data_size, cmd);
 390
 391         kfree(cmd);
 392         return ret;
 393 }
 394
 395 /*
 396  * Returns true if sn2 - buffer_size < sn1 < sn2.
 397  * To be used only in order to compare reorder buffer head with NSSN.
 398  * We fully trust NSSN unless it is behind us due to reorder timeout.
 399  * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
 400  */
 401 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 402 {
 403         return ieee80211_sn_less(sn1, sn2) &&
 404                !ieee80211_sn_less(sn1, sn2 - buffer_size);
 405 }
 406
 407 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 408
 409 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 410                                    struct ieee80211_sta *sta,
 411                                    struct napi_struct *napi,
 412                                    struct iwl_mvm_reorder_buffer *reorder_buf,
 413                                    u16 nssn)
 414 {
 415         u16 ssn = reorder_buf->head_sn;
 416
 417         lockdep_assert_held(&reorder_buf->lock);
 418
 419         /* ignore nssn smaller than head sn - this can happen due to timeout */
 420         if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 421                 goto set_timer;
 422
 423         while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
 424                 int index = ssn % reorder_buf->buf_size;
 425                 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
 426                 struct sk_buff *skb;
 427
 428                 ssn = ieee80211_sn_inc(ssn);
 429
 430                 /*
 431                  * Empty the list. Will have more than one frame for A-MSDU.
 432                  * Empty list is valid as well since nssn indicates frames were
 433                  * received.
 434                  */
 435                 while ((skb = __skb_dequeue(skb_list))) {
 436                         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
 437                                                         reorder_buf->queue,
 438                                                         sta);
 439                         reorder_buf->num_stored--;
 440                 }
 441         }
 442         reorder_buf->head_sn = nssn;
 443
 444 set_timer:
 445         if (reorder_buf->num_stored && !reorder_buf->removed) {
 446                 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
 447
 448                 while (skb_queue_empty(&reorder_buf->entries[index]))
 449                         index = (index + 1) % reorder_buf->buf_size;
 450                 /* modify timer to match next frame's expiration time */
 451                 mod_timer(&reorder_buf->reorder_timer,
 452                           reorder_buf->reorder_time[index] + 1 +
 453                           RX_REORDER_BUF_TIMEOUT_MQ);
 454         } else {
 455                 del_timer(&reorder_buf->reorder_timer);
 456         }
 457 }
 458
 459 void iwl_mvm_reorder_timer_expired(unsigned long data)
 460 {
 461         struct iwl_mvm_reorder_buffer *buf = (void *)data;
 462         int i;
 463         u16 sn = 0, index = 0;
 464         bool expired = false;
 465
 466         spin_lock(&buf->lock);
 467
 468         if (!buf->num_stored || buf->removed) {
 469                 spin_unlock(&buf->lock);
 470                 return;
 471         }
 472
 473         for (i = 0; i < buf->buf_size ; i++) {
 474                 index = (buf->head_sn + i) % buf->buf_size;
 475
 476                 if (skb_queue_empty(&buf->entries[index]))
 477                         continue;
 478                 if (!time_after(jiffies, buf->reorder_time[index] +
 479                                 RX_REORDER_BUF_TIMEOUT_MQ))
 480                         break;
 481                 expired = true;
 482                 sn = ieee80211_sn_add(buf->head_sn, i + 1);
 483         }
 484
 485         if (expired) {
 486                 struct ieee80211_sta *sta;
 487
 488                 rcu_read_lock();
 489                 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
 490                 /* SN is set to the last expired frame + 1 */
 491                 IWL_DEBUG_HT(buf->mvm,
 492                              "Releasing expired frames for sta %u, sn %d\n",
 493                              buf->sta_id, sn);
 494                 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
 495                 rcu_read_unlock();
 496         } else if (buf->num_stored) {
 497                 /*
 498                  * If no frame expired and there are stored frames, index is now
 499                  * pointing to the first unexpired frame - modify timer
 500                  * accordingly to this frame.
 501                  */
 502                 mod_timer(&buf->reorder_timer,
 503                           buf->reorder_time[index] +
 504                           1 + RX_REORDER_BUF_TIMEOUT_MQ);
 505         }
 506         spin_unlock(&buf->lock);
 507 }
 508
 509 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 510                            struct iwl_mvm_delba_data *data)
 511 {
 512         struct iwl_mvm_baid_data *ba_data;
 513         struct ieee80211_sta *sta;
 514         struct iwl_mvm_reorder_buffer *reorder_buf;
 515         u8 baid = data->baid;
 516
 517         if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
 518                 return;
 519
 520         rcu_read_lock();
 521
 522         ba_data = rcu_dereference(mvm->baid_map[baid]);
 523         if (WARN_ON_ONCE(!ba_data))
 524                 goto out;
 525
 526         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 527         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 528                 goto out;
 529
 530         reorder_buf = &ba_data->reorder_buf[queue];
 531
 532         /* release all frames that are in the reorder buffer to the stack */
 533         spin_lock_bh(&reorder_buf->lock);
 534         iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
 535                                ieee80211_sn_add(reorder_buf->head_sn,
 536                                                 reorder_buf->buf_size));
 537         spin_unlock_bh(&reorder_buf->lock);
 538         del_timer_sync(&reorder_buf->reorder_timer);
 539
 540 out:
 541         rcu_read_unlock();
 542 }
 543
 544 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 545                             int queue)
 546 {
 547         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 548         struct iwl_rxq_sync_notification *notif;
 549         struct iwl_mvm_internal_rxq_notif *internal_notif;
 550
 551         notif = (void *)pkt->data;
 552         internal_notif = (void *)notif->payload;
 553
 554         if (internal_notif->sync) {
 555                 if (mvm->queue_sync_cookie != internal_notif->cookie) {
 556                         WARN_ONCE(1,
 557                                   "Received expired RX queue sync message\n");
 558                         return;
 559                 }
 560                 if (!atomic_dec_return(&mvm->queue_sync_counter))
 561                         wake_up(&mvm->rx_sync_waitq);
 562         }
 563
 564         switch (internal_notif->type) {
 565         case IWL_MVM_RXQ_EMPTY:
 566                 break;
 567         case IWL_MVM_RXQ_NOTIF_DEL_BA:
 568                 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 569                 break;
 570         default:
 571                 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 572         }
 573 }
 574
 575 /*
 576  * Returns true if the MPDU was buffered\dropped, false if it should be passed
 577  * to upper layer.
 578  */
 579 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 580                             struct napi_struct *napi,
 581                             int queue,
 582                             struct ieee80211_sta *sta,
 583                             struct sk_buff *skb,
 584                             struct iwl_rx_mpdu_desc *desc)
 585 {
 586         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 587         struct iwl_mvm_sta *mvm_sta;
 588         struct iwl_mvm_baid_data *baid_data;
 589         struct iwl_mvm_reorder_buffer *buffer;
 590         struct sk_buff *tail;
 591         u32 reorder = le32_to_cpu(desc->reorder_data);
 592         bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
 593         bool last_subframe =
 594                 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
 595         u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 596         u8 sub_frame_idx = desc->amsdu_info &
 597                            IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 598         int index;
 599         u16 nssn, sn;
 600         u8 baid;
 601
 602         baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
 603                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 604
 605         /*
 606          * This also covers the case of receiving a Block Ack Request
 607          * outside a BA session; we'll pass it to mac80211 and that
 608          * then sends a delBA action frame.
 609          */
 610         if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
 611                 return false;
 612
 613         /* no sta yet */
 614         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 615                 return false;
 616
 617         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 618
 619         /* not a data packet or a bar */
 620         if (!ieee80211_is_back_req(hdr->frame_control) &&
 621             (!ieee80211_is_data_qos(hdr->frame_control) ||
 622              is_multicast_ether_addr(hdr->addr1)))
 623                 return false;
 624
 625         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 626                 return false;
 627
 628         baid_data = rcu_dereference(mvm->baid_map[baid]);
 629         if (WARN(!baid_data,
 630                  "Received baid %d, but no data exists for this BAID\n", baid))
 631                 return false;
 632         if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
 633                  "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
 634                  baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
 635                  tid))
 636                 return false;
 637
 638         nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
 639         sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
 640                 IWL_RX_MPDU_REORDER_SN_SHIFT;
 641
 642         buffer = &baid_data->reorder_buf[queue];
 643
 644         spin_lock_bh(&buffer->lock);
 645
 646         if (ieee80211_is_back_req(hdr->frame_control)) {
 647                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 648                 goto drop;
 649         }
 650
 651         /*
 652          * If there was a significant jump in the nssn - adjust.
 653          * If the SN is smaller than the NSSN it might need to first go into
 654          * the reorder buffer, in which case we just release up to it and the
 655          * rest of the function will take of storing it and releasing up to the
 656          * nssn
 657          */
 658         if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 659                                 buffer->buf_size)) {
 660                 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 661
 662                 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
 663         }
 664
 665         /* drop any oudated packets */
 666         if (ieee80211_sn_less(sn, buffer->head_sn))
 667                 goto drop;
 668
 669         /* release immediately if allowed by nssn and no stored frames */
 670         if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 671                 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 672                                        buffer->buf_size) &&
 673                    (!amsdu || last_subframe))
 674                         buffer->head_sn = nssn;
 675                 /* No need to update AMSDU last SN - we are moving the head */
 676                 spin_unlock_bh(&buffer->lock);
 677                 return false;
 678         }
 679
 680         index = sn % buffer->buf_size;
 681
 682         /*
 683          * Check if we already stored this frame
 684          * As AMSDU is either received or not as whole, logic is simple:
 685          * If we have frames in that position in the buffer and the last frame
 686          * originated from AMSDU had a different SN then it is a retransmission.
 687          * If it is the same SN then if the subframe index is incrementing it
 688          * is the same AMSDU - otherwise it is a retransmission.
 689          */
 690         tail = skb_peek_tail(&buffer->entries[index]);
 691         if (tail && !amsdu)
 692                 goto drop;
 693         else if (tail && (sn != buffer->last_amsdu ||
 694                           buffer->last_sub_index >= sub_frame_idx))
 695                 goto drop;
 696
 697         /* put in reorder buffer */
 698         __skb_queue_tail(&buffer->entries[index], skb);
 699         buffer->num_stored++;
 700         buffer->reorder_time[index] = jiffies;
 701
 702         if (amsdu) {
 703                 buffer->last_amsdu = sn;
 704                 buffer->last_sub_index = sub_frame_idx;
 705         }
 706
 707         /*
 708          * We cannot trust NSSN for AMSDU sub-frames that are not the last.
 709          * The reason is that NSSN advances on the first sub-frame, and may
 710          * cause the reorder buffer to advance before all the sub-frames arrive.
 711          * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
 712          * SN 1. NSSN for first sub frame will be 3 with the result of driver
 713          * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
 714          * already ahead and it will be dropped.
 715          * If the last sub-frame is not on this queue - we will get frame
 716          * release notification with up to date NSSN.
 717          */
 718         if (!amsdu || last_subframe)
 719                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 720
 721         spin_unlock_bh(&buffer->lock);
 722         return true;
 723
 724 drop:
 725         kfree_skb(skb);
 726         spin_unlock_bh(&buffer->lock);
 727         return true;
 728 }
 729
 730 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid)
 731 {
 732         unsigned long now = jiffies;
 733         unsigned long timeout;
 734         struct iwl_mvm_baid_data *data;
 735
 736         rcu_read_lock();
 737
 738         data = rcu_dereference(mvm->baid_map[baid]);
 739         if (WARN_ON(!data))
 740                 goto out;
 741
 742         if (!data->timeout)
 743                 goto out;
 744
 745         timeout = data->timeout;
 746         /*
 747          * Do not update last rx all the time to avoid cache bouncing
 748          * between the rx queues.
 749          * Update it every timeout. Worst case is the session will
 750          * expire after ~ 2 * timeout, which doesn't matter that much.
 751          */
 752         if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
 753                 /* Update is atomic */
 754                 data->last_rx = now;
 755
 756 out:
 757         rcu_read_unlock();
 758 }
 759
 760 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 761                         struct iwl_rx_cmd_buffer *rxb, int queue)
 762 {
 763         struct ieee80211_rx_status *rx_status;
 764         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 765         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 766         struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 767         u32 len = le16_to_cpu(desc->mpdu_len);
 768         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 769         u16 phy_info = le16_to_cpu(desc->phy_info);
 770         struct ieee80211_sta *sta = NULL;
 771         struct sk_buff *skb;
 772         u8 crypt_len = 0;
 773
 774         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 775          * ieee80211_hdr pulled.
 776          */
 777         skb = alloc_skb(128, GFP_ATOMIC);
 778         if (!skb) {
 779                 IWL_ERR(mvm, "alloc_skb failed\n");
 780                 return;
 781         }
 782
 783         rx_status = IEEE80211_SKB_RXCB(skb);
 784
 785         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 786                 kfree_skb(skb);
 787                 return;
 788         }
 789
 790         /*
 791          * Keep packets with CRC errors (and with overrun) for monitor mode
 792          * (otherwise the firmware discards them) but mark them as bad.
 793          */
 794         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 795             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 796                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 797                              le16_to_cpu(desc->status));
 798                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 799         }
 800         /* set the preamble flag if appropriate */
 801         if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
 802                 rx_status->flag |= RX_FLAG_SHORTPRE;
 803
 804         if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
 805                 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 806                 /* TSF as indicated by the firmware is at INA time */
 807                 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 808         }
 809         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 810         rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
 811                                                NL80211_BAND_2GHZ;
 812         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 813                                                          rx_status->band);
 814         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 815
 816         /* update aggregation data for monitor sake on default queue */
 817         if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
 818                 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
 819
 820                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 821                 rx_status->ampdu_reference = mvm->ampdu_ref;
 822                 /* toggle is switched whenever new aggregation starts */
 823                 if (toggle_bit != mvm->ampdu_toggle) {
 824                         mvm->ampdu_ref++;
 825                         mvm->ampdu_toggle = toggle_bit;
 826                 }
 827         }
 828
 829         rcu_read_lock();
 830
 831         if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
 832                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 833
 834                 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
 835                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 836                         if (IS_ERR(sta))
 837                                 sta = NULL;
 838                 }
 839         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 840                 /*
 841                  * This is fine since we prevent two stations with the same
 842                  * address from being added.
 843                  */
 844                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 845         }
 846
 847         if (sta) {
 848                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 849                 struct ieee80211_vif *tx_blocked_vif =
 850                         rcu_dereference(mvm->csa_tx_blocked_vif);
 851                 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
 852                                IWL_RX_MPDU_REORDER_BAID_MASK) >>
 853                                IWL_RX_MPDU_REORDER_BAID_SHIFT);
 854
 855                 /*
 856                  * We have tx blocked stations (with CS bit). If we heard
 857                  * frames from a blocked station on a new channel we can
 858                  * TX to it again.
 859                  */
 860                 if (unlikely(tx_blocked_vif) &&
 861                     tx_blocked_vif == mvmsta->vif) {
 862                         struct iwl_mvm_vif *mvmvif =
 863                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 864
 865                         if (mvmvif->csa_target_freq == rx_status->freq)
 866                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 867                                                                  false);
 868                 }
 869
 870                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 871
 872                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 873                     ieee80211_is_beacon(hdr->frame_control)) {
 874                         struct iwl_fw_dbg_trigger_tlv *trig;
 875                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 876                         bool trig_check;
 877                         s32 rssi;
 878
 879                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 880                                                       FW_DBG_TRIGGER_RSSI);
 881                         rssi_trig = (void *)trig->data;
 882                         rssi = le32_to_cpu(rssi_trig->rssi);
 883
 884                         trig_check =
 885                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 886                                                               trig);
 887                         if (trig_check && rx_status->signal < rssi)
 888                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 889                 }
 890
 891                 if (ieee80211_is_data(hdr->frame_control))
 892                         iwl_mvm_rx_csum(sta, skb, desc);
 893
 894                 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
 895                         kfree_skb(skb);
 896                         rcu_read_unlock();
 897                         return;
 898                 }
 899
 900                 /*
 901                  * Our hardware de-aggregates AMSDUs but copies the mac header
 902                  * as it to the de-aggregated MPDUs. We need to turn off the
 903                  * AMSDU bit in the QoS control ourselves.
 904                  */
 905                 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
 906                     !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
 907                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 908
 909                         *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 910                         if (!(desc->amsdu_info &
 911                               IWL_RX_MPDU_AMSDU_LAST_SUBFRAME))
 912                                 rx_status->flag |= RX_FLAG_AMSDU_MORE;
 913                 }
 914                 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 915                         iwl_mvm_agg_rx_received(mvm, baid);
 916         }
 917
 918         /* Set up the HT phy flags */
 919         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 920         case RATE_MCS_CHAN_WIDTH_20:
 921                 break;
 922         case RATE_MCS_CHAN_WIDTH_40:
 923                 rx_status->flag |= RX_FLAG_40MHZ;
 924                 break;
 925         case RATE_MCS_CHAN_WIDTH_80:
 926                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 927                 break;
 928         case RATE_MCS_CHAN_WIDTH_160:
 929                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 930                 break;
 931         }
 932         if (rate_n_flags & RATE_MCS_SGI_MSK)
 933                 rx_status->flag |= RX_FLAG_SHORT_GI;
 934         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 935                 rx_status->flag |= RX_FLAG_HT_GF;
 936         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 937                 rx_status->flag |= RX_FLAG_LDPC;
 938         if (rate_n_flags & RATE_MCS_HT_MSK) {
 939                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 940                                 RATE_MCS_STBC_POS;
 941                 rx_status->flag |= RX_FLAG_HT;
 942                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 943                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 944         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 945                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 946                                 RATE_MCS_STBC_POS;
 947                 rx_status->vht_nss =
 948                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 949                                                 RATE_VHT_MCS_NSS_POS) + 1;
 950                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 951                 rx_status->flag |= RX_FLAG_VHT;
 952                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 953                 if (rate_n_flags & RATE_MCS_BF_MSK)
 954                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 955         } else {
 956                 rx_status->rate_idx =
 957                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 958                                                             rx_status->band);
 959         }
 960
 961         /* management stuff on default queue */
 962         if (!queue) {
 963                 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 964                               ieee80211_is_probe_resp(hdr->frame_control)) &&
 965                              mvm->sched_scan_pass_all ==
 966                              SCHED_SCAN_PASS_ALL_ENABLED))
 967                         mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 968
 969                 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 970                              ieee80211_is_probe_resp(hdr->frame_control)))
 971                         rx_status->boottime_ns = ktime_get_boot_ns();
 972         }
 973
 974         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
 975         if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
 976                 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
 977         rcu_read_unlock();
 978 }
 979
 980 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 981                               struct iwl_rx_cmd_buffer *rxb, int queue)
 982 {
 983         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 984         struct iwl_frame_release *release = (void *)pkt->data;
 985         struct ieee80211_sta *sta;
 986         struct iwl_mvm_reorder_buffer *reorder_buf;
 987         struct iwl_mvm_baid_data *ba_data;
 988
 989         int baid = release->baid;
 990
 991         IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
 992                      release->baid, le16_to_cpu(release->nssn));
 993
 994         if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
 995                 return;
 996
 997         rcu_read_lock();
 998
 999         ba_data = rcu_dereference(mvm->baid_map[baid]);
1000         if (WARN_ON_ONCE(!ba_data))
1001                 goto out;
1002
1003         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
1004         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
1005                 goto out;
1006
1007         reorder_buf = &ba_data->reorder_buf[queue];
1008
1009         spin_lock_bh(&reorder_buf->lock);
1010         iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
1011                                le16_to_cpu(release->nssn));
1012         spin_unlock_bh(&reorder_buf->lock);
1013
1014 out:
1015         rcu_read_unlock();
1016 }