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  *
  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 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         memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
 136         stats->flag |= RX_FLAG_PN_VALIDATED;
 137
 138         return 0;
 139 }
 140
 141 /* iwl_mvm_create_skb Adds the rxb to a new skb */
 142 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
 143                                u16 len, u8 crypt_len,
 144                                struct iwl_rx_cmd_buffer *rxb)
 145 {
 146         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 147         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 148         unsigned int headlen, fraglen, pad_len = 0;
 149         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 150
 151         if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD)
 152                 pad_len = 2;
 153         len -= pad_len;
 154
 155         /* If frame is small enough to fit in skb->head, pull it completely.
 156          * If not, only pull ieee80211_hdr (including crypto if present, and
 157          * an additional 8 bytes for SNAP/ethertype, see below) so that
 158          * splice() or TCP coalesce are more efficient.
 159          *
 160          * Since, in addition, ieee80211_data_to_8023() always pull in at
 161          * least 8 bytes (possibly more for mesh) we can do the same here
 162          * to save the cost of doing it later. That still doesn't pull in
 163          * the actual IP header since the typical case has a SNAP header.
 164          * If the latter changes (there are efforts in the standards group
 165          * to do so) we should revisit this and ieee80211_data_to_8023().
 166          */
 167         headlen = (len <= skb_tailroom(skb)) ? len :
 168                                                hdrlen + crypt_len + 8;
 169
 170         /* The firmware may align the packet to DWORD.
 171          * The padding is inserted after the IV.
 172          * After copying the header + IV skip the padding if
 173          * present before copying packet data.
 174          */
 175         hdrlen += crypt_len;
 176         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 177         memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len,
 178                headlen - hdrlen);
 179
 180         fraglen = len - headlen;
 181
 182         if (fraglen) {
 183                 int offset = (void *)hdr + headlen + pad_len -
 184                              rxb_addr(rxb) + rxb_offset(rxb);
 185
 186                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 187                                 fraglen, rxb->truesize);
 188         }
 189 }
 190
 191 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
 192 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 193                                             struct napi_struct *napi,
 194                                             struct sk_buff *skb, int queue,
 195                                             struct ieee80211_sta *sta)
 196 {
 197         if (iwl_mvm_check_pn(mvm, skb, queue, sta))
 198                 kfree_skb(skb);
 199         else
 200                 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 201 }
 202
 203 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 204                                         struct iwl_rx_mpdu_desc *desc,
 205                                         struct ieee80211_rx_status *rx_status)
 206 {
 207         int energy_a, energy_b, max_energy;
 208
 209         energy_a = desc->energy_a;
 210         energy_a = energy_a ? -energy_a : S8_MIN;
 211         energy_b = desc->energy_b;
 212         energy_b = energy_b ? -energy_b : S8_MIN;
 213         max_energy = max(energy_a, energy_b);
 214
 215         IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
 216                         energy_a, energy_b, max_energy);
 217
 218         rx_status->signal = max_energy;
 219         rx_status->chains = 0; /* TODO: phy info */
 220         rx_status->chain_signal[0] = energy_a;
 221         rx_status->chain_signal[1] = energy_b;
 222         rx_status->chain_signal[2] = S8_MIN;
 223 }
 224
 225 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 226                              struct ieee80211_rx_status *stats,
 227                              struct iwl_rx_mpdu_desc *desc, int queue,
 228                              u8 *crypt_len)
 229 {
 230         u16 status = le16_to_cpu(desc->status);
 231
 232         if (!ieee80211_has_protected(hdr->frame_control) ||
 233             (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 234             IWL_RX_MPDU_STATUS_SEC_NONE)
 235                 return 0;
 236
 237         /* TODO: handle packets encrypted with unknown alg */
 238
 239         switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
 240         case IWL_RX_MPDU_STATUS_SEC_CCM:
 241         case IWL_RX_MPDU_STATUS_SEC_GCM:
 242                 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
 243                 /* alg is CCM: check MIC only */
 244                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 245                         return -1;
 246
 247                 stats->flag |= RX_FLAG_DECRYPTED;
 248                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 249                 return 0;
 250         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 251                 /* Don't drop the frame and decrypt it in SW */
 252                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 253                         return 0;
 254
 255                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 256                 /* fall through if TTAK OK */
 257         case IWL_RX_MPDU_STATUS_SEC_WEP:
 258                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 259                         return -1;
 260
 261                 stats->flag |= RX_FLAG_DECRYPTED;
 262                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 263                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 264                         *crypt_len = IEEE80211_WEP_IV_LEN;
 265                 return 0;
 266         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 267                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 268                         return -1;
 269                 stats->flag |= RX_FLAG_DECRYPTED;
 270                 return 0;
 271         default:
 272                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 273         }
 274
 275         return 0;
 276 }
 277
 278 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 279                             struct sk_buff *skb,
 280                             struct iwl_rx_mpdu_desc *desc)
 281 {
 282         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 283         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 284         u16 flags = le16_to_cpu(desc->l3l4_flags);
 285         u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
 286                           IWL_RX_L3_PROTO_POS);
 287
 288         if (mvmvif->features & NETIF_F_RXCSUM &&
 289             flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
 290             (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
 291              l3_prot == IWL_RX_L3_TYPE_IPV6 ||
 292              l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
 293                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 294 }
 295
 296 /*
 297  * returns true if a packet outside BA session is a duplicate and
 298  * should be dropped
 299  */
 300 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
 301                                   struct ieee80211_rx_status *rx_status,
 302                                   struct ieee80211_hdr *hdr,
 303                                   struct iwl_rx_mpdu_desc *desc)
 304 {
 305         struct iwl_mvm_sta *mvm_sta;
 306         struct iwl_mvm_rxq_dup_data *dup_data;
 307         u8 baid, tid, sub_frame_idx;
 308
 309         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 310                 return false;
 311
 312         baid = (le32_to_cpu(desc->reorder_data) &
 313                 IWL_RX_MPDU_REORDER_BAID_MASK) >>
 314                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 315
 316         if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 317                 return false;
 318
 319         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 320         dup_data = &mvm_sta->dup_data[queue];
 321
 322         /*
 323          * Drop duplicate 802.11 retransmissions
 324          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 325          */
 326         if (ieee80211_is_ctl(hdr->frame_control) ||
 327             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
 328             is_multicast_ether_addr(hdr->addr1)) {
 329                 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 330                 return false;
 331         }
 332
 333         if (ieee80211_is_data_qos(hdr->frame_control))
 334                 /* frame has qos control */
 335                 tid = *ieee80211_get_qos_ctl(hdr) &
 336                         IEEE80211_QOS_CTL_TID_MASK;
 337         else
 338                 tid = IWL_MAX_TID_COUNT;
 339
 340         /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
 341         sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 342
 343         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 344                      dup_data->last_seq[tid] == hdr->seq_ctrl &&
 345                      dup_data->last_sub_frame[tid] >= sub_frame_idx))
 346                 return true;
 347
 348         dup_data->last_seq[tid] = hdr->seq_ctrl;
 349         dup_data->last_sub_frame[tid] = sub_frame_idx;
 350
 351         rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 352
 353         return false;
 354 }
 355
 356 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 357                             const u8 *data, u32 count)
 358 {
 359         struct iwl_rxq_sync_cmd *cmd;
 360         u32 data_size = sizeof(*cmd) + count;
 361         int ret;
 362
 363         /* should be DWORD aligned */
 364         if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
 365                 return -EINVAL;
 366
 367         cmd = kzalloc(data_size, GFP_KERNEL);
 368         if (!cmd)
 369                 return -ENOMEM;
 370
 371         cmd->rxq_mask = cpu_to_le32(rxq_mask);
 372         cmd->count =  cpu_to_le32(count);
 373         cmd->flags = 0;
 374         memcpy(cmd->payload, data, count);
 375
 376         ret = iwl_mvm_send_cmd_pdu(mvm,
 377                                    WIDE_ID(DATA_PATH_GROUP,
 378                                            TRIGGER_RX_QUEUES_NOTIF_CMD),
 379                                    0, data_size, cmd);
 380
 381         kfree(cmd);
 382         return ret;
 383 }
 384
 385 /*
 386  * Returns true if sn2 - buffer_size < sn1 < sn2.
 387  * To be used only in order to compare reorder buffer head with NSSN.
 388  * We fully trust NSSN unless it is behind us due to reorder timeout.
 389  * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
 390  */
 391 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 392 {
 393         return ieee80211_sn_less(sn1, sn2) &&
 394                !ieee80211_sn_less(sn1, sn2 - buffer_size);
 395 }
 396
 397 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 398
 399 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 400                                    struct ieee80211_sta *sta,
 401                                    struct napi_struct *napi,
 402                                    struct iwl_mvm_reorder_buffer *reorder_buf,
 403                                    u16 nssn)
 404 {
 405         u16 ssn = reorder_buf->head_sn;
 406
 407         lockdep_assert_held(&reorder_buf->lock);
 408
 409         /* ignore nssn smaller than head sn - this can happen due to timeout */
 410         if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 411                 return;
 412
 413         while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
 414                 int index = ssn % reorder_buf->buf_size;
 415                 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
 416                 struct sk_buff *skb;
 417
 418                 ssn = ieee80211_sn_inc(ssn);
 419
 420                 /* holes are valid since nssn indicates frames were received. */
 421                 if (skb_queue_empty(skb_list) || !skb_peek_tail(skb_list))
 422                         continue;
 423                 /* Empty the list. Will have more than one frame for A-MSDU */
 424                 while ((skb = __skb_dequeue(skb_list))) {
 425                         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
 426                                                         reorder_buf->queue,
 427                                                         sta);
 428                         reorder_buf->num_stored--;
 429                 }
 430         }
 431         reorder_buf->head_sn = nssn;
 432
 433         if (reorder_buf->num_stored && !reorder_buf->removed) {
 434                 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
 435
 436                 while (!skb_peek_tail(&reorder_buf->entries[index]))
 437                         index = (index + 1) % reorder_buf->buf_size;
 438                 /* modify timer to match next frame's expiration time */
 439                 mod_timer(&reorder_buf->reorder_timer,
 440                           reorder_buf->reorder_time[index] + 1 +
 441                           RX_REORDER_BUF_TIMEOUT_MQ);
 442         } else {
 443                 del_timer(&reorder_buf->reorder_timer);
 444         }
 445 }
 446
 447 void iwl_mvm_reorder_timer_expired(unsigned long data)
 448 {
 449         struct iwl_mvm_reorder_buffer *buf = (void *)data;
 450         int i;
 451         u16 sn = 0, index = 0;
 452         bool expired = false;
 453
 454         spin_lock_bh(&buf->lock);
 455
 456         if (!buf->num_stored || buf->removed) {
 457                 spin_unlock_bh(&buf->lock);
 458                 return;
 459         }
 460
 461         for (i = 0; i < buf->buf_size ; i++) {
 462                 index = (buf->head_sn + i) % buf->buf_size;
 463
 464                 if (!skb_peek_tail(&buf->entries[index]))
 465                         continue;
 466                 if (!time_after(jiffies, buf->reorder_time[index] +
 467                                 RX_REORDER_BUF_TIMEOUT_MQ))
 468                         break;
 469                 expired = true;
 470                 sn = ieee80211_sn_add(buf->head_sn, i + 1);
 471         }
 472
 473         if (expired) {
 474                 struct ieee80211_sta *sta;
 475
 476                 rcu_read_lock();
 477                 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
 478                 /* SN is set to the last expired frame + 1 */
 479                 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
 480                 rcu_read_unlock();
 481         } else if (buf->num_stored) {
 482                 /*
 483                  * If no frame expired and there are stored frames, index is now
 484                  * pointing to the first unexpired frame - modify timer
 485                  * accordingly to this frame.
 486                  */
 487                 mod_timer(&buf->reorder_timer,
 488                           buf->reorder_time[index] +
 489                           1 + RX_REORDER_BUF_TIMEOUT_MQ);
 490         }
 491         spin_unlock_bh(&buf->lock);
 492 }
 493
 494 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 495                            struct iwl_mvm_delba_data *data)
 496 {
 497         struct iwl_mvm_baid_data *ba_data;
 498         struct ieee80211_sta *sta;
 499         struct iwl_mvm_reorder_buffer *reorder_buf;
 500         u8 baid = data->baid;
 501
 502         if (WARN_ON_ONCE(baid >= IWL_RX_REORDER_DATA_INVALID_BAID))
 503                 return;
 504
 505         rcu_read_lock();
 506
 507         ba_data = rcu_dereference(mvm->baid_map[baid]);
 508         if (WARN_ON_ONCE(!ba_data))
 509                 goto out;
 510
 511         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 512         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 513                 goto out;
 514
 515         reorder_buf = &ba_data->reorder_buf[queue];
 516
 517         /* release all frames that are in the reorder buffer to the stack */
 518         spin_lock_bh(&reorder_buf->lock);
 519         iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
 520                                ieee80211_sn_add(reorder_buf->head_sn,
 521                                                 reorder_buf->buf_size));
 522         spin_unlock_bh(&reorder_buf->lock);
 523         del_timer_sync(&reorder_buf->reorder_timer);
 524
 525 out:
 526         rcu_read_unlock();
 527 }
 528
 529 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 530                             int queue)
 531 {
 532         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 533         struct iwl_rxq_sync_notification *notif;
 534         struct iwl_mvm_internal_rxq_notif *internal_notif;
 535
 536         notif = (void *)pkt->data;
 537         internal_notif = (void *)notif->payload;
 538
 539         if (internal_notif->sync) {
 540                 if (mvm->queue_sync_cookie != internal_notif->cookie) {
 541                         WARN_ONCE(1,
 542                                   "Received expired RX queue sync message\n");
 543                         return;
 544                 }
 545                 atomic_dec(&mvm->queue_sync_counter);
 546         }
 547
 548         switch (internal_notif->type) {
 549         case IWL_MVM_RXQ_EMPTY:
 550                 break;
 551         case IWL_MVM_RXQ_NOTIF_DEL_BA:
 552                 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 553                 break;
 554         default:
 555                 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 556         }
 557 }
 558
 559 /*
 560  * Returns true if the MPDU was buffered\dropped, false if it should be passed
 561  * to upper layer.
 562  */
 563 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 564                             struct napi_struct *napi,
 565                             int queue,
 566                             struct ieee80211_sta *sta,
 567                             struct sk_buff *skb,
 568                             struct iwl_rx_mpdu_desc *desc)
 569 {
 570         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 571         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 572         struct iwl_mvm_baid_data *baid_data;
 573         struct iwl_mvm_reorder_buffer *buffer;
 574         struct sk_buff *tail;
 575         u32 reorder = le32_to_cpu(desc->reorder_data);
 576         bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
 577         bool last_subframe =
 578                 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
 579         u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 580         u8 sub_frame_idx = desc->amsdu_info &
 581                            IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 582         int index;
 583         u16 nssn, sn;
 584         u8 baid;
 585
 586         baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
 587                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 588
 589         if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
 590                 return false;
 591
 592         /* no sta yet */
 593         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 594                 return false;
 595
 596         /* not a data packet */
 597         if (!ieee80211_is_data_qos(hdr->frame_control) ||
 598             is_multicast_ether_addr(hdr->addr1))
 599                 return false;
 600
 601         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 602                 return false;
 603
 604         baid_data = rcu_dereference(mvm->baid_map[baid]);
 605         if (WARN(!baid_data,
 606                  "Received baid %d, but no data exists for this BAID\n", baid))
 607                 return false;
 608         if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
 609                  "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
 610                  baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
 611                  tid))
 612                 return false;
 613
 614         nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
 615         sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
 616                 IWL_RX_MPDU_REORDER_SN_SHIFT;
 617
 618         buffer = &baid_data->reorder_buf[queue];
 619
 620         spin_lock_bh(&buffer->lock);
 621
 622         /*
 623          * If there was a significant jump in the nssn - adjust.
 624          * If the SN is smaller than the NSSN it might need to first go into
 625          * the reorder buffer, in which case we just release up to it and the
 626          * rest of the function will take of storing it and releasing up to the
 627          * nssn
 628          */
 629         if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 630                                 buffer->buf_size)) {
 631                 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 632
 633                 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
 634         }
 635
 636         /* drop any oudated packets */
 637         if (ieee80211_sn_less(sn, buffer->head_sn))
 638                 goto drop;
 639
 640         /* release immediately if allowed by nssn and no stored frames */
 641         if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 642                 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 643                                        buffer->buf_size) &&
 644                    (!amsdu || last_subframe))
 645                         buffer->head_sn = nssn;
 646                 /* No need to update AMSDU last SN - we are moving the head */
 647                 spin_unlock_bh(&buffer->lock);
 648                 return false;
 649         }
 650
 651         index = sn % buffer->buf_size;
 652
 653         /*
 654          * Check if we already stored this frame
 655          * As AMSDU is either received or not as whole, logic is simple:
 656          * If we have frames in that position in the buffer and the last frame
 657          * originated from AMSDU had a different SN then it is a retransmission.
 658          * If it is the same SN then if the subframe index is incrementing it
 659          * is the same AMSDU - otherwise it is a retransmission.
 660          */
 661         tail = skb_peek_tail(&buffer->entries[index]);
 662         if (tail && !amsdu)
 663                 goto drop;
 664         else if (tail && (sn != buffer->last_amsdu ||
 665                           buffer->last_sub_index >= sub_frame_idx))
 666                 goto drop;
 667
 668         /* put in reorder buffer */
 669         __skb_queue_tail(&buffer->entries[index], skb);
 670         buffer->num_stored++;
 671         buffer->reorder_time[index] = jiffies;
 672
 673         if (amsdu) {
 674                 buffer->last_amsdu = sn;
 675                 buffer->last_sub_index = sub_frame_idx;
 676         }
 677
 678         /*
 679          * We cannot trust NSSN for AMSDU sub-frames that are not the last.
 680          * The reason is that NSSN advances on the first sub-frame, and may
 681          * cause the reorder buffer to advance before all the sub-frames arrive.
 682          * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
 683          * SN 1. NSSN for first sub frame will be 3 with the result of driver
 684          * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
 685          * already ahead and it will be dropped.
 686          * If the last sub-frame is not on this queue - we will get frame
 687          * release notification with up to date NSSN.
 688          */
 689         if (!amsdu || last_subframe)
 690                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 691
 692         spin_unlock_bh(&buffer->lock);
 693         return true;
 694
 695 drop:
 696         kfree_skb(skb);
 697         spin_unlock_bh(&buffer->lock);
 698         return true;
 699 }
 700
 701 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid)
 702 {
 703         unsigned long now = jiffies;
 704         unsigned long timeout;
 705         struct iwl_mvm_baid_data *data;
 706
 707         rcu_read_lock();
 708
 709         data = rcu_dereference(mvm->baid_map[baid]);
 710         if (WARN_ON(!data))
 711                 goto out;
 712
 713         if (!data->timeout)
 714                 goto out;
 715
 716         timeout = data->timeout;
 717         /*
 718          * Do not update last rx all the time to avoid cache bouncing
 719          * between the rx queues.
 720          * Update it every timeout. Worst case is the session will
 721          * expire after ~ 2 * timeout, which doesn't matter that much.
 722          */
 723         if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
 724                 /* Update is atomic */
 725                 data->last_rx = now;
 726
 727 out:
 728         rcu_read_unlock();
 729 }
 730
 731 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 732                         struct iwl_rx_cmd_buffer *rxb, int queue)
 733 {
 734         struct ieee80211_rx_status *rx_status;
 735         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 736         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 737         struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 738         u32 len = le16_to_cpu(desc->mpdu_len);
 739         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 740         u16 phy_info = le16_to_cpu(desc->phy_info);
 741         struct ieee80211_sta *sta = NULL;
 742         struct sk_buff *skb;
 743         u8 crypt_len = 0;
 744
 745         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 746          * ieee80211_hdr pulled.
 747          */
 748         skb = alloc_skb(128, GFP_ATOMIC);
 749         if (!skb) {
 750                 IWL_ERR(mvm, "alloc_skb failed\n");
 751                 return;
 752         }
 753
 754         rx_status = IEEE80211_SKB_RXCB(skb);
 755
 756         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 757                 kfree_skb(skb);
 758                 return;
 759         }
 760
 761         /*
 762          * Keep packets with CRC errors (and with overrun) for monitor mode
 763          * (otherwise the firmware discards them) but mark them as bad.
 764          */
 765         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 766             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 767                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 768                              le16_to_cpu(desc->status));
 769                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 770         }
 771         /* set the preamble flag if appropriate */
 772         if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
 773                 rx_status->flag |= RX_FLAG_SHORTPRE;
 774
 775         if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
 776                 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 777                 /* TSF as indicated by the firmware is at INA time */
 778                 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 779         }
 780         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 781         rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
 782                                                NL80211_BAND_2GHZ;
 783         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 784                                                          rx_status->band);
 785         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 786
 787         /* update aggregation data for monitor sake on default queue */
 788         if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
 789                 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
 790
 791                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 792                 rx_status->ampdu_reference = mvm->ampdu_ref;
 793                 /* toggle is switched whenever new aggregation starts */
 794                 if (toggle_bit != mvm->ampdu_toggle) {
 795                         mvm->ampdu_ref++;
 796                         mvm->ampdu_toggle = toggle_bit;
 797                 }
 798         }
 799
 800         rcu_read_lock();
 801
 802         if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
 803                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 804
 805                 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
 806                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 807                         if (IS_ERR(sta))
 808                                 sta = NULL;
 809                 }
 810         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 811                 /*
 812                  * This is fine since we prevent two stations with the same
 813                  * address from being added.
 814                  */
 815                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 816         }
 817
 818         if (sta) {
 819                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 820                 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
 821                                IWL_RX_MPDU_REORDER_BAID_MASK) >>
 822                                IWL_RX_MPDU_REORDER_BAID_SHIFT);
 823
 824                 /*
 825                  * We have tx blocked stations (with CS bit). If we heard
 826                  * frames from a blocked station on a new channel we can
 827                  * TX to it again.
 828                  */
 829                 if (unlikely(mvm->csa_tx_block_bcn_timeout))
 830                         iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
 831
 832                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 833
 834                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 835                     ieee80211_is_beacon(hdr->frame_control)) {
 836                         struct iwl_fw_dbg_trigger_tlv *trig;
 837                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 838                         bool trig_check;
 839                         s32 rssi;
 840
 841                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 842                                                       FW_DBG_TRIGGER_RSSI);
 843                         rssi_trig = (void *)trig->data;
 844                         rssi = le32_to_cpu(rssi_trig->rssi);
 845
 846                         trig_check =
 847                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 848                                                               trig);
 849                         if (trig_check && rx_status->signal < rssi)
 850                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 851                 }
 852
 853                 if (ieee80211_is_data(hdr->frame_control))
 854                         iwl_mvm_rx_csum(sta, skb, desc);
 855
 856                 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
 857                         kfree_skb(skb);
 858                         rcu_read_unlock();
 859                         return;
 860                 }
 861
 862                 /*
 863                  * Our hardware de-aggregates AMSDUs but copies the mac header
 864                  * as it to the de-aggregated MPDUs. We need to turn off the
 865                  * AMSDU bit in the QoS control ourselves.
 866                  */
 867                 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
 868                     !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
 869                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 870
 871                         *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 872                 }
 873                 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 874                         iwl_mvm_agg_rx_received(mvm, baid);
 875         }
 876
 877         /* Set up the HT phy flags */
 878         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 879         case RATE_MCS_CHAN_WIDTH_20:
 880                 break;
 881         case RATE_MCS_CHAN_WIDTH_40:
 882                 rx_status->flag |= RX_FLAG_40MHZ;
 883                 break;
 884         case RATE_MCS_CHAN_WIDTH_80:
 885                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 886                 break;
 887         case RATE_MCS_CHAN_WIDTH_160:
 888                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 889                 break;
 890         }
 891         if (rate_n_flags & RATE_MCS_SGI_MSK)
 892                 rx_status->flag |= RX_FLAG_SHORT_GI;
 893         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 894                 rx_status->flag |= RX_FLAG_HT_GF;
 895         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 896                 rx_status->flag |= RX_FLAG_LDPC;
 897         if (rate_n_flags & RATE_MCS_HT_MSK) {
 898                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 899                                 RATE_MCS_STBC_POS;
 900                 rx_status->flag |= RX_FLAG_HT;
 901                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 902                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 903         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 904                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 905                                 RATE_MCS_STBC_POS;
 906                 rx_status->vht_nss =
 907                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 908                                                 RATE_VHT_MCS_NSS_POS) + 1;
 909                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 910                 rx_status->flag |= RX_FLAG_VHT;
 911                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 912                 if (rate_n_flags & RATE_MCS_BF_MSK)
 913                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 914         } else {
 915                 rx_status->rate_idx =
 916                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 917                                                             rx_status->band);
 918         }
 919
 920         /* management stuff on default queue */
 921         if (!queue) {
 922                 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 923                               ieee80211_is_probe_resp(hdr->frame_control)) &&
 924                              mvm->sched_scan_pass_all ==
 925                              SCHED_SCAN_PASS_ALL_ENABLED))
 926                         mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 927
 928                 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 929                              ieee80211_is_probe_resp(hdr->frame_control)))
 930                         rx_status->boottime_ns = ktime_get_boot_ns();
 931         }
 932
 933         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
 934         if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
 935                 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
 936         rcu_read_unlock();
 937 }
 938
 939 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 940                               struct iwl_rx_cmd_buffer *rxb, int queue)
 941 {
 942         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 943         struct iwl_frame_release *release = (void *)pkt->data;
 944         struct ieee80211_sta *sta;
 945         struct iwl_mvm_reorder_buffer *reorder_buf;
 946         struct iwl_mvm_baid_data *ba_data;
 947
 948         int baid = release->baid;
 949
 950         if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
 951                 return;
 952
 953         rcu_read_lock();
 954
 955         ba_data = rcu_dereference(mvm->baid_map[baid]);
 956         if (WARN_ON_ONCE(!ba_data))
 957                 goto out;
 958
 959         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 960         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 961                 goto out;
 962
 963         reorder_buf = &ba_data->reorder_buf[queue];
 964
 965         spin_lock_bh(&reorder_buf->lock);
 966         iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
 967                                le16_to_cpu(release->nssn));
 968         spin_unlock_bh(&reorder_buf->lock);
 969
 970 out:
 971         rcu_read_unlock();
 972 }