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         len -= pad_len;
 155
 156         /* If frame is small enough to fit in skb->head, pull it completely.
 157          * If not, only pull ieee80211_hdr (including crypto if present, and
 158          * an additional 8 bytes for SNAP/ethertype, see below) so that
 159          * splice() or TCP coalesce are more efficient.
 160          *
 161          * Since, in addition, ieee80211_data_to_8023() always pull in at
 162          * least 8 bytes (possibly more for mesh) we can do the same here
 163          * to save the cost of doing it later. That still doesn't pull in
 164          * the actual IP header since the typical case has a SNAP header.
 165          * If the latter changes (there are efforts in the standards group
 166          * to do so) we should revisit this and ieee80211_data_to_8023().
 167          */
 168         headlen = (len <= skb_tailroom(skb)) ? len :
 169                                                hdrlen + crypt_len + 8;
 170
 171         /* The firmware may align the packet to DWORD.
 172          * The padding is inserted after the IV.
 173          * After copying the header + IV skip the padding if
 174          * present before copying packet data.
 175          */
 176         hdrlen += crypt_len;
 177         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 178         memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len,
 179                headlen - hdrlen);
 180
 181         fraglen = len - headlen;
 182
 183         if (fraglen) {
 184                 int offset = (void *)hdr + headlen + pad_len -
 185                              rxb_addr(rxb) + rxb_offset(rxb);
 186
 187                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 188                                 fraglen, rxb->truesize);
 189         }
 190 }
 191
 192 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
 193 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 194                                             struct napi_struct *napi,
 195                                             struct sk_buff *skb, int queue,
 196                                             struct ieee80211_sta *sta)
 197 {
 198         if (iwl_mvm_check_pn(mvm, skb, queue, sta))
 199                 kfree_skb(skb);
 200         else
 201                 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 202 }
 203
 204 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 205                                         struct iwl_rx_mpdu_desc *desc,
 206                                         struct ieee80211_rx_status *rx_status)
 207 {
 208         int energy_a, energy_b, max_energy;
 209
 210         energy_a = desc->energy_a;
 211         energy_a = energy_a ? -energy_a : S8_MIN;
 212         energy_b = desc->energy_b;
 213         energy_b = energy_b ? -energy_b : S8_MIN;
 214         max_energy = max(energy_a, energy_b);
 215
 216         IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
 217                         energy_a, energy_b, max_energy);
 218
 219         rx_status->signal = max_energy;
 220         rx_status->chains = 0; /* TODO: phy info */
 221         rx_status->chain_signal[0] = energy_a;
 222         rx_status->chain_signal[1] = energy_b;
 223         rx_status->chain_signal[2] = S8_MIN;
 224 }
 225
 226 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 227                              struct ieee80211_rx_status *stats,
 228                              struct iwl_rx_mpdu_desc *desc, int queue,
 229                              u8 *crypt_len)
 230 {
 231         u16 status = le16_to_cpu(desc->status);
 232
 233         if (!ieee80211_has_protected(hdr->frame_control) ||
 234             (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 235             IWL_RX_MPDU_STATUS_SEC_NONE)
 236                 return 0;
 237
 238         /* TODO: handle packets encrypted with unknown alg */
 239
 240         switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
 241         case IWL_RX_MPDU_STATUS_SEC_CCM:
 242         case IWL_RX_MPDU_STATUS_SEC_GCM:
 243                 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
 244                 /* alg is CCM: check MIC only */
 245                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 246                         return -1;
 247
 248                 stats->flag |= RX_FLAG_DECRYPTED;
 249                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 250                 return 0;
 251         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 252                 /* Don't drop the frame and decrypt it in SW */
 253                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 254                         return 0;
 255
 256                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 257                 /* fall through if TTAK OK */
 258         case IWL_RX_MPDU_STATUS_SEC_WEP:
 259                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 260                         return -1;
 261
 262                 stats->flag |= RX_FLAG_DECRYPTED;
 263                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 264                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 265                         *crypt_len = IEEE80211_WEP_IV_LEN;
 266                 return 0;
 267         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 268                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 269                         return -1;
 270                 stats->flag |= RX_FLAG_DECRYPTED;
 271                 return 0;
 272         default:
 273                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 274         }
 275
 276         return 0;
 277 }
 278
 279 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 280                             struct sk_buff *skb,
 281                             struct iwl_rx_mpdu_desc *desc)
 282 {
 283         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 284         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 285         u16 flags = le16_to_cpu(desc->l3l4_flags);
 286         u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
 287                           IWL_RX_L3_PROTO_POS);
 288
 289         if (mvmvif->features & NETIF_F_RXCSUM &&
 290             flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
 291             (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
 292              l3_prot == IWL_RX_L3_TYPE_IPV6 ||
 293              l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
 294                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 295 }
 296
 297 /*
 298  * returns true if a packet outside BA session is a duplicate and
 299  * should be dropped
 300  */
 301 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
 302                                   struct ieee80211_rx_status *rx_status,
 303                                   struct ieee80211_hdr *hdr,
 304                                   struct iwl_rx_mpdu_desc *desc)
 305 {
 306         struct iwl_mvm_sta *mvm_sta;
 307         struct iwl_mvm_rxq_dup_data *dup_data;
 308         u8 baid, tid, sub_frame_idx;
 309
 310         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 311                 return false;
 312
 313         baid = (le32_to_cpu(desc->reorder_data) &
 314                 IWL_RX_MPDU_REORDER_BAID_MASK) >>
 315                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 316
 317         if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 318                 return false;
 319
 320         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 321         dup_data = &mvm_sta->dup_data[queue];
 322
 323         /*
 324          * Drop duplicate 802.11 retransmissions
 325          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 326          */
 327         if (ieee80211_is_ctl(hdr->frame_control) ||
 328             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
 329             is_multicast_ether_addr(hdr->addr1)) {
 330                 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 331                 return false;
 332         }
 333
 334         if (ieee80211_is_data_qos(hdr->frame_control))
 335                 /* frame has qos control */
 336                 tid = *ieee80211_get_qos_ctl(hdr) &
 337                         IEEE80211_QOS_CTL_TID_MASK;
 338         else
 339                 tid = IWL_MAX_TID_COUNT;
 340
 341         /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
 342         sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 343
 344         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 345                      dup_data->last_seq[tid] == hdr->seq_ctrl &&
 346                      dup_data->last_sub_frame[tid] >= sub_frame_idx))
 347                 return true;
 348
 349         dup_data->last_seq[tid] = hdr->seq_ctrl;
 350         dup_data->last_sub_frame[tid] = sub_frame_idx;
 351
 352         rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 353
 354         return false;
 355 }
 356
 357 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 358                             const u8 *data, u32 count)
 359 {
 360         struct iwl_rxq_sync_cmd *cmd;
 361         u32 data_size = sizeof(*cmd) + count;
 362         int ret;
 363
 364         /* should be DWORD aligned */
 365         if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
 366                 return -EINVAL;
 367
 368         cmd = kzalloc(data_size, GFP_KERNEL);
 369         if (!cmd)
 370                 return -ENOMEM;
 371
 372         cmd->rxq_mask = cpu_to_le32(rxq_mask);
 373         cmd->count =  cpu_to_le32(count);
 374         cmd->flags = 0;
 375         memcpy(cmd->payload, data, count);
 376
 377         ret = iwl_mvm_send_cmd_pdu(mvm,
 378                                    WIDE_ID(DATA_PATH_GROUP,
 379                                            TRIGGER_RX_QUEUES_NOTIF_CMD),
 380                                    0, data_size, cmd);
 381
 382         kfree(cmd);
 383         return ret;
 384 }
 385
 386 /*
 387  * Returns true if sn2 - buffer_size < sn1 < sn2.
 388  * To be used only in order to compare reorder buffer head with NSSN.
 389  * We fully trust NSSN unless it is behind us due to reorder timeout.
 390  * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
 391  */
 392 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 393 {
 394         return ieee80211_sn_less(sn1, sn2) &&
 395                !ieee80211_sn_less(sn1, sn2 - buffer_size);
 396 }
 397
 398 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 399
 400 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 401                                    struct ieee80211_sta *sta,
 402                                    struct napi_struct *napi,
 403                                    struct iwl_mvm_reorder_buffer *reorder_buf,
 404                                    u16 nssn)
 405 {
 406         u16 ssn = reorder_buf->head_sn;
 407
 408         lockdep_assert_held(&reorder_buf->lock);
 409
 410         /* ignore nssn smaller than head sn - this can happen due to timeout */
 411         if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 412                 return;
 413
 414         while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
 415                 int index = ssn % reorder_buf->buf_size;
 416                 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
 417                 struct sk_buff *skb;
 418
 419                 ssn = ieee80211_sn_inc(ssn);
 420
 421                 /*
 422                  * Empty the list. Will have more than one frame for A-MSDU.
 423                  * Empty list is valid as well since nssn indicates frames were
 424                  * received.
 425                  */
 426                 while ((skb = __skb_dequeue(skb_list))) {
 427                         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
 428                                                         reorder_buf->queue,
 429                                                         sta);
 430                         reorder_buf->num_stored--;
 431                 }
 432         }
 433         reorder_buf->head_sn = nssn;
 434
 435         if (reorder_buf->num_stored && !reorder_buf->removed) {
 436                 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
 437
 438                 while (skb_queue_empty(&reorder_buf->entries[index]))
 439                         index = (index + 1) % reorder_buf->buf_size;
 440                 /* modify timer to match next frame's expiration time */
 441                 mod_timer(&reorder_buf->reorder_timer,
 442                           reorder_buf->reorder_time[index] + 1 +
 443                           RX_REORDER_BUF_TIMEOUT_MQ);
 444         } else {
 445                 del_timer(&reorder_buf->reorder_timer);
 446         }
 447 }
 448
 449 void iwl_mvm_reorder_timer_expired(unsigned long data)
 450 {
 451         struct iwl_mvm_reorder_buffer *buf = (void *)data;
 452         int i;
 453         u16 sn = 0, index = 0;
 454         bool expired = false;
 455
 456         spin_lock(&buf->lock);
 457
 458         if (!buf->num_stored || buf->removed) {
 459                 spin_unlock(&buf->lock);
 460                 return;
 461         }
 462
 463         for (i = 0; i < buf->buf_size ; i++) {
 464                 index = (buf->head_sn + i) % buf->buf_size;
 465
 466                 if (skb_queue_empty(&buf->entries[index]))
 467                         continue;
 468                 if (!time_after(jiffies, buf->reorder_time[index] +
 469                                 RX_REORDER_BUF_TIMEOUT_MQ))
 470                         break;
 471                 expired = true;
 472                 sn = ieee80211_sn_add(buf->head_sn, i + 1);
 473         }
 474
 475         if (expired) {
 476                 struct ieee80211_sta *sta;
 477
 478                 rcu_read_lock();
 479                 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
 480                 /* SN is set to the last expired frame + 1 */
 481                 IWL_DEBUG_HT(buf->mvm,
 482                              "Releasing expired frames for sta %u, sn %d\n",
 483                              buf->sta_id, sn);
 484                 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
 485                 rcu_read_unlock();
 486         } else if (buf->num_stored) {
 487                 /*
 488                  * If no frame expired and there are stored frames, index is now
 489                  * pointing to the first unexpired frame - modify timer
 490                  * accordingly to this frame.
 491                  */
 492                 mod_timer(&buf->reorder_timer,
 493                           buf->reorder_time[index] +
 494                           1 + RX_REORDER_BUF_TIMEOUT_MQ);
 495         }
 496         spin_unlock(&buf->lock);
 497 }
 498
 499 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 500                            struct iwl_mvm_delba_data *data)
 501 {
 502         struct iwl_mvm_baid_data *ba_data;
 503         struct ieee80211_sta *sta;
 504         struct iwl_mvm_reorder_buffer *reorder_buf;
 505         u8 baid = data->baid;
 506
 507         if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
 508                 return;
 509
 510         rcu_read_lock();
 511
 512         ba_data = rcu_dereference(mvm->baid_map[baid]);
 513         if (WARN_ON_ONCE(!ba_data))
 514                 goto out;
 515
 516         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 517         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 518                 goto out;
 519
 520         reorder_buf = &ba_data->reorder_buf[queue];
 521
 522         /* release all frames that are in the reorder buffer to the stack */
 523         spin_lock_bh(&reorder_buf->lock);
 524         iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
 525                                ieee80211_sn_add(reorder_buf->head_sn,
 526                                                 reorder_buf->buf_size));
 527         spin_unlock_bh(&reorder_buf->lock);
 528         del_timer_sync(&reorder_buf->reorder_timer);
 529
 530 out:
 531         rcu_read_unlock();
 532 }
 533
 534 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 535                             int queue)
 536 {
 537         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 538         struct iwl_rxq_sync_notification *notif;
 539         struct iwl_mvm_internal_rxq_notif *internal_notif;
 540
 541         notif = (void *)pkt->data;
 542         internal_notif = (void *)notif->payload;
 543
 544         if (internal_notif->sync) {
 545                 if (mvm->queue_sync_cookie != internal_notif->cookie) {
 546                         WARN_ONCE(1,
 547                                   "Received expired RX queue sync message\n");
 548                         return;
 549                 }
 550                 atomic_dec(&mvm->queue_sync_counter);
 551         }
 552
 553         switch (internal_notif->type) {
 554         case IWL_MVM_RXQ_EMPTY:
 555                 break;
 556         case IWL_MVM_RXQ_NOTIF_DEL_BA:
 557                 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 558                 break;
 559         default:
 560                 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 561         }
 562 }
 563
 564 /*
 565  * Returns true if the MPDU was buffered\dropped, false if it should be passed
 566  * to upper layer.
 567  */
 568 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 569                             struct napi_struct *napi,
 570                             int queue,
 571                             struct ieee80211_sta *sta,
 572                             struct sk_buff *skb,
 573                             struct iwl_rx_mpdu_desc *desc)
 574 {
 575         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 576         struct iwl_mvm_sta *mvm_sta;
 577         struct iwl_mvm_baid_data *baid_data;
 578         struct iwl_mvm_reorder_buffer *buffer;
 579         struct sk_buff *tail;
 580         u32 reorder = le32_to_cpu(desc->reorder_data);
 581         bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
 582         bool last_subframe =
 583                 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
 584         u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 585         u8 sub_frame_idx = desc->amsdu_info &
 586                            IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 587         int index;
 588         u16 nssn, sn;
 589         u8 baid;
 590
 591         baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
 592                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 593
 594         if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
 595                 return false;
 596
 597         /* no sta yet */
 598         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 599                 return false;
 600
 601         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 602
 603         /* not a data packet or a bar */
 604         if (!ieee80211_is_back_req(hdr->frame_control) &&
 605             (!ieee80211_is_data_qos(hdr->frame_control) ||
 606              is_multicast_ether_addr(hdr->addr1)))
 607                 return false;
 608
 609         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 610                 return false;
 611
 612         baid_data = rcu_dereference(mvm->baid_map[baid]);
 613         if (WARN(!baid_data,
 614                  "Received baid %d, but no data exists for this BAID\n", baid))
 615                 return false;
 616         if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
 617                  "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
 618                  baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
 619                  tid))
 620                 return false;
 621
 622         nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
 623         sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
 624                 IWL_RX_MPDU_REORDER_SN_SHIFT;
 625
 626         buffer = &baid_data->reorder_buf[queue];
 627
 628         spin_lock_bh(&buffer->lock);
 629
 630         if (ieee80211_is_back_req(hdr->frame_control)) {
 631                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 632                 goto drop;
 633         }
 634
 635         /*
 636          * If there was a significant jump in the nssn - adjust.
 637          * If the SN is smaller than the NSSN it might need to first go into
 638          * the reorder buffer, in which case we just release up to it and the
 639          * rest of the function will take of storing it and releasing up to the
 640          * nssn
 641          */
 642         if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 643                                 buffer->buf_size)) {
 644                 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 645
 646                 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
 647         }
 648
 649         /* drop any oudated packets */
 650         if (ieee80211_sn_less(sn, buffer->head_sn))
 651                 goto drop;
 652
 653         /* release immediately if allowed by nssn and no stored frames */
 654         if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 655                 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 656                                        buffer->buf_size) &&
 657                    (!amsdu || last_subframe))
 658                         buffer->head_sn = nssn;
 659                 /* No need to update AMSDU last SN - we are moving the head */
 660                 spin_unlock_bh(&buffer->lock);
 661                 return false;
 662         }
 663
 664         index = sn % buffer->buf_size;
 665
 666         /*
 667          * Check if we already stored this frame
 668          * As AMSDU is either received or not as whole, logic is simple:
 669          * If we have frames in that position in the buffer and the last frame
 670          * originated from AMSDU had a different SN then it is a retransmission.
 671          * If it is the same SN then if the subframe index is incrementing it
 672          * is the same AMSDU - otherwise it is a retransmission.
 673          */
 674         tail = skb_peek_tail(&buffer->entries[index]);
 675         if (tail && !amsdu)
 676                 goto drop;
 677         else if (tail && (sn != buffer->last_amsdu ||
 678                           buffer->last_sub_index >= sub_frame_idx))
 679                 goto drop;
 680
 681         /* put in reorder buffer */
 682         __skb_queue_tail(&buffer->entries[index], skb);
 683         buffer->num_stored++;
 684         buffer->reorder_time[index] = jiffies;
 685
 686         if (amsdu) {
 687                 buffer->last_amsdu = sn;
 688                 buffer->last_sub_index = sub_frame_idx;
 689         }
 690
 691         /*
 692          * We cannot trust NSSN for AMSDU sub-frames that are not the last.
 693          * The reason is that NSSN advances on the first sub-frame, and may
 694          * cause the reorder buffer to advance before all the sub-frames arrive.
 695          * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
 696          * SN 1. NSSN for first sub frame will be 3 with the result of driver
 697          * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
 698          * already ahead and it will be dropped.
 699          * If the last sub-frame is not on this queue - we will get frame
 700          * release notification with up to date NSSN.
 701          */
 702         if (!amsdu || last_subframe)
 703                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 704
 705         spin_unlock_bh(&buffer->lock);
 706         return true;
 707
 708 drop:
 709         kfree_skb(skb);
 710         spin_unlock_bh(&buffer->lock);
 711         return true;
 712 }
 713
 714 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid)
 715 {
 716         unsigned long now = jiffies;
 717         unsigned long timeout;
 718         struct iwl_mvm_baid_data *data;
 719
 720         rcu_read_lock();
 721
 722         data = rcu_dereference(mvm->baid_map[baid]);
 723         if (WARN_ON(!data))
 724                 goto out;
 725
 726         if (!data->timeout)
 727                 goto out;
 728
 729         timeout = data->timeout;
 730         /*
 731          * Do not update last rx all the time to avoid cache bouncing
 732          * between the rx queues.
 733          * Update it every timeout. Worst case is the session will
 734          * expire after ~ 2 * timeout, which doesn't matter that much.
 735          */
 736         if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
 737                 /* Update is atomic */
 738                 data->last_rx = now;
 739
 740 out:
 741         rcu_read_unlock();
 742 }
 743
 744 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 745                         struct iwl_rx_cmd_buffer *rxb, int queue)
 746 {
 747         struct ieee80211_rx_status *rx_status;
 748         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 749         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 750         struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 751         u32 len = le16_to_cpu(desc->mpdu_len);
 752         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 753         u16 phy_info = le16_to_cpu(desc->phy_info);
 754         struct ieee80211_sta *sta = NULL;
 755         struct sk_buff *skb;
 756         u8 crypt_len = 0;
 757
 758         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 759          * ieee80211_hdr pulled.
 760          */
 761         skb = alloc_skb(128, GFP_ATOMIC);
 762         if (!skb) {
 763                 IWL_ERR(mvm, "alloc_skb failed\n");
 764                 return;
 765         }
 766
 767         rx_status = IEEE80211_SKB_RXCB(skb);
 768
 769         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 770                 kfree_skb(skb);
 771                 return;
 772         }
 773
 774         /*
 775          * Keep packets with CRC errors (and with overrun) for monitor mode
 776          * (otherwise the firmware discards them) but mark them as bad.
 777          */
 778         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 779             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 780                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 781                              le16_to_cpu(desc->status));
 782                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 783         }
 784         /* set the preamble flag if appropriate */
 785         if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
 786                 rx_status->flag |= RX_FLAG_SHORTPRE;
 787
 788         if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
 789                 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 790                 /* TSF as indicated by the firmware is at INA time */
 791                 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 792         }
 793         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 794         rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
 795                                                NL80211_BAND_2GHZ;
 796         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 797                                                          rx_status->band);
 798         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 799
 800         /* update aggregation data for monitor sake on default queue */
 801         if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
 802                 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
 803
 804                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 805                 rx_status->ampdu_reference = mvm->ampdu_ref;
 806                 /* toggle is switched whenever new aggregation starts */
 807                 if (toggle_bit != mvm->ampdu_toggle) {
 808                         mvm->ampdu_ref++;
 809                         mvm->ampdu_toggle = toggle_bit;
 810                 }
 811         }
 812
 813         rcu_read_lock();
 814
 815         if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
 816                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 817
 818                 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
 819                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 820                         if (IS_ERR(sta))
 821                                 sta = NULL;
 822                 }
 823         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 824                 /*
 825                  * This is fine since we prevent two stations with the same
 826                  * address from being added.
 827                  */
 828                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 829         }
 830
 831         if (sta) {
 832                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 833                 struct ieee80211_vif *tx_blocked_vif =
 834                         rcu_dereference(mvm->csa_tx_blocked_vif);
 835                 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
 836                                IWL_RX_MPDU_REORDER_BAID_MASK) >>
 837                                IWL_RX_MPDU_REORDER_BAID_SHIFT);
 838
 839                 /*
 840                  * We have tx blocked stations (with CS bit). If we heard
 841                  * frames from a blocked station on a new channel we can
 842                  * TX to it again.
 843                  */
 844                 if (unlikely(tx_blocked_vif) &&
 845                     tx_blocked_vif == mvmsta->vif) {
 846                         struct iwl_mvm_vif *mvmvif =
 847                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 848
 849                         if (mvmvif->csa_target_freq == rx_status->freq)
 850                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 851                                                                  false);
 852                 }
 853
 854                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 855
 856                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 857                     ieee80211_is_beacon(hdr->frame_control)) {
 858                         struct iwl_fw_dbg_trigger_tlv *trig;
 859                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 860                         bool trig_check;
 861                         s32 rssi;
 862
 863                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 864                                                       FW_DBG_TRIGGER_RSSI);
 865                         rssi_trig = (void *)trig->data;
 866                         rssi = le32_to_cpu(rssi_trig->rssi);
 867
 868                         trig_check =
 869                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 870                                                               trig);
 871                         if (trig_check && rx_status->signal < rssi)
 872                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 873                 }
 874
 875                 if (ieee80211_is_data(hdr->frame_control))
 876                         iwl_mvm_rx_csum(sta, skb, desc);
 877
 878                 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
 879                         kfree_skb(skb);
 880                         rcu_read_unlock();
 881                         return;
 882                 }
 883
 884                 /*
 885                  * Our hardware de-aggregates AMSDUs but copies the mac header
 886                  * as it to the de-aggregated MPDUs. We need to turn off the
 887                  * AMSDU bit in the QoS control ourselves.
 888                  */
 889                 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
 890                     !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
 891                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 892
 893                         *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 894                         if (!(desc->amsdu_info &
 895                               IWL_RX_MPDU_AMSDU_LAST_SUBFRAME))
 896                                 rx_status->flag |= RX_FLAG_AMSDU_MORE;
 897                 }
 898                 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 899                         iwl_mvm_agg_rx_received(mvm, baid);
 900         }
 901
 902         /* Set up the HT phy flags */
 903         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 904         case RATE_MCS_CHAN_WIDTH_20:
 905                 break;
 906         case RATE_MCS_CHAN_WIDTH_40:
 907                 rx_status->flag |= RX_FLAG_40MHZ;
 908                 break;
 909         case RATE_MCS_CHAN_WIDTH_80:
 910                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 911                 break;
 912         case RATE_MCS_CHAN_WIDTH_160:
 913                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 914                 break;
 915         }
 916         if (rate_n_flags & RATE_MCS_SGI_MSK)
 917                 rx_status->flag |= RX_FLAG_SHORT_GI;
 918         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 919                 rx_status->flag |= RX_FLAG_HT_GF;
 920         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 921                 rx_status->flag |= RX_FLAG_LDPC;
 922         if (rate_n_flags & RATE_MCS_HT_MSK) {
 923                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 924                                 RATE_MCS_STBC_POS;
 925                 rx_status->flag |= RX_FLAG_HT;
 926                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 927                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 928         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 929                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 930                                 RATE_MCS_STBC_POS;
 931                 rx_status->vht_nss =
 932                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 933                                                 RATE_VHT_MCS_NSS_POS) + 1;
 934                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 935                 rx_status->flag |= RX_FLAG_VHT;
 936                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 937                 if (rate_n_flags & RATE_MCS_BF_MSK)
 938                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 939         } else {
 940                 rx_status->rate_idx =
 941                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 942                                                             rx_status->band);
 943         }
 944
 945         /* management stuff on default queue */
 946         if (!queue) {
 947                 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 948                               ieee80211_is_probe_resp(hdr->frame_control)) &&
 949                              mvm->sched_scan_pass_all ==
 950                              SCHED_SCAN_PASS_ALL_ENABLED))
 951                         mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 952
 953                 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 954                              ieee80211_is_probe_resp(hdr->frame_control)))
 955                         rx_status->boottime_ns = ktime_get_boot_ns();
 956         }
 957
 958         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
 959         if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
 960                 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
 961         rcu_read_unlock();
 962 }
 963
 964 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 965                               struct iwl_rx_cmd_buffer *rxb, int queue)
 966 {
 967         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 968         struct iwl_frame_release *release = (void *)pkt->data;
 969         struct ieee80211_sta *sta;
 970         struct iwl_mvm_reorder_buffer *reorder_buf;
 971         struct iwl_mvm_baid_data *ba_data;
 972
 973         int baid = release->baid;
 974
 975         IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
 976                      release->baid, le16_to_cpu(release->nssn));
 977
 978         if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
 979                 return;
 980
 981         rcu_read_lock();
 982
 983         ba_data = rcu_dereference(mvm->baid_map[baid]);
 984         if (WARN_ON_ONCE(!ba_data))
 985                 goto out;
 986
 987         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 988         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 989                 goto out;
 990
 991         reorder_buf = &ba_data->reorder_buf[queue];
 992
 993         spin_lock_bh(&reorder_buf->lock);
 994         iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
 995                                le16_to_cpu(release->nssn));
 996         spin_unlock_bh(&reorder_buf->lock);
 997
 998 out:
 999         rcu_read_unlock();
1000 }