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         int res;
  76         u8 tid, keyidx;
  77         u8 pn[IEEE80211_CCMP_PN_LEN];
  78         u8 *extiv;
  79
  80         /* do PN checking */
  81
  82         /* multicast and non-data only arrives on default queue */
  83         if (!ieee80211_is_data(hdr->frame_control) ||
  84             is_multicast_ether_addr(hdr->addr1))
  85                 return 0;
  86
  87         /* do not check PN for open AP */
  88         if (!(stats->flag & RX_FLAG_DECRYPTED))
  89                 return 0;
  90
  91         /*
  92          * avoid checking for default queue - we don't want to replicate
  93          * all the logic that's necessary for checking the PN on fragmented
  94          * frames, leave that to mac80211
  95          */
  96         if (queue == 0)
  97                 return 0;
  98
  99         /* if we are here - this for sure is either CCMP or GCMP */
 100         if (IS_ERR_OR_NULL(sta)) {
 101                 IWL_ERR(mvm,
 102                         "expected hw-decrypted unicast frame for station\n");
 103                 return -1;
 104         }
 105
 106         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 107
 108         extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
 109         keyidx = extiv[3] >> 6;
 110
 111         ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
 112         if (!ptk_pn)
 113                 return -1;
 114
 115         if (ieee80211_is_data_qos(hdr->frame_control))
 116                 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 117         else
 118                 tid = 0;
 119
 120         /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
 121         if (tid >= IWL_MAX_TID_COUNT)
 122                 return -1;
 123
 124         /* load pn */
 125         pn[0] = extiv[7];
 126         pn[1] = extiv[6];
 127         pn[2] = extiv[5];
 128         pn[3] = extiv[4];
 129         pn[4] = extiv[1];
 130         pn[5] = extiv[0];
 131
 132         res = memcmp(pn, ptk_pn->q[queue].pn[tid], IEEE80211_CCMP_PN_LEN);
 133         if (res < 0)
 134                 return -1;
 135         if (!res && !(stats->flag & RX_FLAG_ALLOW_SAME_PN))
 136                 return -1;
 137
 138         memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
 139         stats->flag |= RX_FLAG_PN_VALIDATED;
 140
 141         return 0;
 142 }
 143
 144 /* iwl_mvm_create_skb Adds the rxb to a new skb */
 145 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
 146                                u16 len, u8 crypt_len,
 147                                struct iwl_rx_cmd_buffer *rxb)
 148 {
 149         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 150         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 151         unsigned int headlen, fraglen, pad_len = 0;
 152         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 153
 154         if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD)
 155                 pad_len = 2;
 156         len -= pad_len;
 157
 158         /* If frame is small enough to fit in skb->head, pull it completely.
 159          * If not, only pull ieee80211_hdr (including crypto if present, and
 160          * an additional 8 bytes for SNAP/ethertype, see below) so that
 161          * splice() or TCP coalesce are more efficient.
 162          *
 163          * Since, in addition, ieee80211_data_to_8023() always pull in at
 164          * least 8 bytes (possibly more for mesh) we can do the same here
 165          * to save the cost of doing it later. That still doesn't pull in
 166          * the actual IP header since the typical case has a SNAP header.
 167          * If the latter changes (there are efforts in the standards group
 168          * to do so) we should revisit this and ieee80211_data_to_8023().
 169          */
 170         headlen = (len <= skb_tailroom(skb)) ? len :
 171                                                hdrlen + crypt_len + 8;
 172
 173         /* The firmware may align the packet to DWORD.
 174          * The padding is inserted after the IV.
 175          * After copying the header + IV skip the padding if
 176          * present before copying packet data.
 177          */
 178         hdrlen += crypt_len;
 179         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 180         memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len,
 181                headlen - hdrlen);
 182
 183         fraglen = len - headlen;
 184
 185         if (fraglen) {
 186                 int offset = (void *)hdr + headlen + pad_len -
 187                              rxb_addr(rxb) + rxb_offset(rxb);
 188
 189                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 190                                 fraglen, rxb->truesize);
 191         }
 192 }
 193
 194 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
 195 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 196                                             struct napi_struct *napi,
 197                                             struct sk_buff *skb, int queue,
 198                                             struct ieee80211_sta *sta)
 199 {
 200         if (iwl_mvm_check_pn(mvm, skb, queue, sta))
 201                 kfree_skb(skb);
 202         else
 203                 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 204 }
 205
 206 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 207                                         struct iwl_rx_mpdu_desc *desc,
 208                                         struct ieee80211_rx_status *rx_status)
 209 {
 210         int energy_a, energy_b, max_energy;
 211
 212         energy_a = desc->energy_a;
 213         energy_a = energy_a ? -energy_a : S8_MIN;
 214         energy_b = desc->energy_b;
 215         energy_b = energy_b ? -energy_b : S8_MIN;
 216         max_energy = max(energy_a, energy_b);
 217
 218         IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
 219                         energy_a, energy_b, max_energy);
 220
 221         rx_status->signal = max_energy;
 222         rx_status->chains = 0; /* TODO: phy info */
 223         rx_status->chain_signal[0] = energy_a;
 224         rx_status->chain_signal[1] = energy_b;
 225         rx_status->chain_signal[2] = S8_MIN;
 226 }
 227
 228 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 229                              struct ieee80211_rx_status *stats,
 230                              struct iwl_rx_mpdu_desc *desc, int queue,
 231                              u8 *crypt_len)
 232 {
 233         u16 status = le16_to_cpu(desc->status);
 234
 235         if (!ieee80211_has_protected(hdr->frame_control) ||
 236             (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 237             IWL_RX_MPDU_STATUS_SEC_NONE)
 238                 return 0;
 239
 240         /* TODO: handle packets encrypted with unknown alg */
 241
 242         switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
 243         case IWL_RX_MPDU_STATUS_SEC_CCM:
 244         case IWL_RX_MPDU_STATUS_SEC_GCM:
 245                 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
 246                 /* alg is CCM: check MIC only */
 247                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 248                         return -1;
 249
 250                 stats->flag |= RX_FLAG_DECRYPTED;
 251                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 252                 return 0;
 253         case IWL_RX_MPDU_STATUS_SEC_TKIP:
 254                 /* Don't drop the frame and decrypt it in SW */
 255                 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
 256                         return 0;
 257
 258                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 259                 /* fall through if TTAK OK */
 260         case IWL_RX_MPDU_STATUS_SEC_WEP:
 261                 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
 262                         return -1;
 263
 264                 stats->flag |= RX_FLAG_DECRYPTED;
 265                 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
 266                                 IWL_RX_MPDU_STATUS_SEC_WEP)
 267                         *crypt_len = IEEE80211_WEP_IV_LEN;
 268                 return 0;
 269         case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
 270                 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
 271                         return -1;
 272                 stats->flag |= RX_FLAG_DECRYPTED;
 273                 return 0;
 274         default:
 275                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
 276         }
 277
 278         return 0;
 279 }
 280
 281 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 282                             struct sk_buff *skb,
 283                             struct iwl_rx_mpdu_desc *desc)
 284 {
 285         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 286         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 287         u16 flags = le16_to_cpu(desc->l3l4_flags);
 288         u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
 289                           IWL_RX_L3_PROTO_POS);
 290
 291         if (mvmvif->features & NETIF_F_RXCSUM &&
 292             flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
 293             (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
 294              l3_prot == IWL_RX_L3_TYPE_IPV6 ||
 295              l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
 296                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 297 }
 298
 299 /*
 300  * returns true if a packet is a duplicate and should be dropped.
 301  * Updates AMSDU PN tracking info
 302  */
 303 static bool iwl_mvm_is_dup(struct ieee80211_sta *sta, int queue,
 304                            struct ieee80211_rx_status *rx_status,
 305                            struct ieee80211_hdr *hdr,
 306                            struct iwl_rx_mpdu_desc *desc)
 307 {
 308         struct iwl_mvm_sta *mvm_sta;
 309         struct iwl_mvm_rxq_dup_data *dup_data;
 310         u8 tid, sub_frame_idx;
 311
 312         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 313                 return false;
 314
 315         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 316         dup_data = &mvm_sta->dup_data[queue];
 317
 318         /*
 319          * Drop duplicate 802.11 retransmissions
 320          * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
 321          */
 322         if (ieee80211_is_ctl(hdr->frame_control) ||
 323             ieee80211_is_qos_nullfunc(hdr->frame_control) ||
 324             is_multicast_ether_addr(hdr->addr1)) {
 325                 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 326                 return false;
 327         }
 328
 329         if (ieee80211_is_data_qos(hdr->frame_control))
 330                 /* frame has qos control */
 331                 tid = *ieee80211_get_qos_ctl(hdr) &
 332                         IEEE80211_QOS_CTL_TID_MASK;
 333         else
 334                 tid = IWL_MAX_TID_COUNT;
 335
 336         /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
 337         sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 338
 339         if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 340                      dup_data->last_seq[tid] == hdr->seq_ctrl &&
 341                      dup_data->last_sub_frame[tid] >= sub_frame_idx))
 342                 return true;
 343
 344         /* Allow same PN as the first subframe for following sub frames */
 345         if (dup_data->last_seq[tid] == hdr->seq_ctrl &&
 346             sub_frame_idx > dup_data->last_sub_frame[tid] &&
 347             desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU)
 348                 rx_status->flag |= RX_FLAG_ALLOW_SAME_PN;
 349
 350         dup_data->last_seq[tid] = hdr->seq_ctrl;
 351         dup_data->last_sub_frame[tid] = sub_frame_idx;
 352
 353         rx_status->flag |= RX_FLAG_DUP_VALIDATED;
 354
 355         return false;
 356 }
 357
 358 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
 359                             const u8 *data, u32 count)
 360 {
 361         struct iwl_rxq_sync_cmd *cmd;
 362         u32 data_size = sizeof(*cmd) + count;
 363         int ret;
 364
 365         /* should be DWORD aligned */
 366         if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
 367                 return -EINVAL;
 368
 369         cmd = kzalloc(data_size, GFP_KERNEL);
 370         if (!cmd)
 371                 return -ENOMEM;
 372
 373         cmd->rxq_mask = cpu_to_le32(rxq_mask);
 374         cmd->count =  cpu_to_le32(count);
 375         cmd->flags = 0;
 376         memcpy(cmd->payload, data, count);
 377
 378         ret = iwl_mvm_send_cmd_pdu(mvm,
 379                                    WIDE_ID(DATA_PATH_GROUP,
 380                                            TRIGGER_RX_QUEUES_NOTIF_CMD),
 381                                    0, data_size, cmd);
 382
 383         kfree(cmd);
 384         return ret;
 385 }
 386
 387 /*
 388  * Returns true if sn2 - buffer_size < sn1 < sn2.
 389  * To be used only in order to compare reorder buffer head with NSSN.
 390  * We fully trust NSSN unless it is behind us due to reorder timeout.
 391  * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
 392  */
 393 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
 394 {
 395         return ieee80211_sn_less(sn1, sn2) &&
 396                !ieee80211_sn_less(sn1, sn2 - buffer_size);
 397 }
 398
 399 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
 400
 401 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
 402                                    struct ieee80211_sta *sta,
 403                                    struct napi_struct *napi,
 404                                    struct iwl_mvm_reorder_buffer *reorder_buf,
 405                                    u16 nssn)
 406 {
 407         u16 ssn = reorder_buf->head_sn;
 408
 409         lockdep_assert_held(&reorder_buf->lock);
 410
 411         /* ignore nssn smaller than head sn - this can happen due to timeout */
 412         if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
 413                 goto set_timer;
 414
 415         while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
 416                 int index = ssn % reorder_buf->buf_size;
 417                 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
 418                 struct sk_buff *skb;
 419
 420                 ssn = ieee80211_sn_inc(ssn);
 421
 422                 /*
 423                  * Empty the list. Will have more than one frame for A-MSDU.
 424                  * Empty list is valid as well since nssn indicates frames were
 425                  * received.
 426                  */
 427                 while ((skb = __skb_dequeue(skb_list))) {
 428                         iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
 429                                                         reorder_buf->queue,
 430                                                         sta);
 431                         reorder_buf->num_stored--;
 432                 }
 433         }
 434         reorder_buf->head_sn = nssn;
 435
 436 set_timer:
 437         if (reorder_buf->num_stored && !reorder_buf->removed) {
 438                 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
 439
 440                 while (skb_queue_empty(&reorder_buf->entries[index]))
 441                         index = (index + 1) % reorder_buf->buf_size;
 442                 /* modify timer to match next frame's expiration time */
 443                 mod_timer(&reorder_buf->reorder_timer,
 444                           reorder_buf->reorder_time[index] + 1 +
 445                           RX_REORDER_BUF_TIMEOUT_MQ);
 446         } else {
 447                 del_timer(&reorder_buf->reorder_timer);
 448         }
 449 }
 450
 451 void iwl_mvm_reorder_timer_expired(unsigned long data)
 452 {
 453         struct iwl_mvm_reorder_buffer *buf = (void *)data;
 454         int i;
 455         u16 sn = 0, index = 0;
 456         bool expired = false;
 457
 458         spin_lock(&buf->lock);
 459
 460         if (!buf->num_stored || buf->removed) {
 461                 spin_unlock(&buf->lock);
 462                 return;
 463         }
 464
 465         for (i = 0; i < buf->buf_size ; i++) {
 466                 index = (buf->head_sn + i) % buf->buf_size;
 467
 468                 if (skb_queue_empty(&buf->entries[index]))
 469                         continue;
 470                 if (!time_after(jiffies, buf->reorder_time[index] +
 471                                 RX_REORDER_BUF_TIMEOUT_MQ))
 472                         break;
 473                 expired = true;
 474                 sn = ieee80211_sn_add(buf->head_sn, i + 1);
 475         }
 476
 477         if (expired) {
 478                 struct ieee80211_sta *sta;
 479
 480                 rcu_read_lock();
 481                 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
 482                 /* SN is set to the last expired frame + 1 */
 483                 IWL_DEBUG_HT(buf->mvm,
 484                              "Releasing expired frames for sta %u, sn %d\n",
 485                              buf->sta_id, sn);
 486                 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
 487                 rcu_read_unlock();
 488         } else if (buf->num_stored) {
 489                 /*
 490                  * If no frame expired and there are stored frames, index is now
 491                  * pointing to the first unexpired frame - modify timer
 492                  * accordingly to this frame.
 493                  */
 494                 mod_timer(&buf->reorder_timer,
 495                           buf->reorder_time[index] +
 496                           1 + RX_REORDER_BUF_TIMEOUT_MQ);
 497         }
 498         spin_unlock(&buf->lock);
 499 }
 500
 501 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
 502                            struct iwl_mvm_delba_data *data)
 503 {
 504         struct iwl_mvm_baid_data *ba_data;
 505         struct ieee80211_sta *sta;
 506         struct iwl_mvm_reorder_buffer *reorder_buf;
 507         u8 baid = data->baid;
 508
 509         if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
 510                 return;
 511
 512         rcu_read_lock();
 513
 514         ba_data = rcu_dereference(mvm->baid_map[baid]);
 515         if (WARN_ON_ONCE(!ba_data))
 516                 goto out;
 517
 518         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 519         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 520                 goto out;
 521
 522         reorder_buf = &ba_data->reorder_buf[queue];
 523
 524         /* release all frames that are in the reorder buffer to the stack */
 525         spin_lock_bh(&reorder_buf->lock);
 526         iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
 527                                ieee80211_sn_add(reorder_buf->head_sn,
 528                                                 reorder_buf->buf_size));
 529         spin_unlock_bh(&reorder_buf->lock);
 530         del_timer_sync(&reorder_buf->reorder_timer);
 531
 532 out:
 533         rcu_read_unlock();
 534 }
 535
 536 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 537                             int queue)
 538 {
 539         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 540         struct iwl_rxq_sync_notification *notif;
 541         struct iwl_mvm_internal_rxq_notif *internal_notif;
 542
 543         notif = (void *)pkt->data;
 544         internal_notif = (void *)notif->payload;
 545
 546         if (internal_notif->sync) {
 547                 if (mvm->queue_sync_cookie != internal_notif->cookie) {
 548                         WARN_ONCE(1,
 549                                   "Received expired RX queue sync message\n");
 550                         return;
 551                 }
 552                 if (!atomic_dec_return(&mvm->queue_sync_counter))
 553                         wake_up(&mvm->rx_sync_waitq);
 554         }
 555
 556         switch (internal_notif->type) {
 557         case IWL_MVM_RXQ_EMPTY:
 558                 break;
 559         case IWL_MVM_RXQ_NOTIF_DEL_BA:
 560                 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
 561                 break;
 562         default:
 563                 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
 564         }
 565 }
 566
 567 /*
 568  * Returns true if the MPDU was buffered\dropped, false if it should be passed
 569  * to upper layer.
 570  */
 571 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
 572                             struct napi_struct *napi,
 573                             int queue,
 574                             struct ieee80211_sta *sta,
 575                             struct sk_buff *skb,
 576                             struct iwl_rx_mpdu_desc *desc)
 577 {
 578         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 579         struct iwl_mvm_sta *mvm_sta;
 580         struct iwl_mvm_baid_data *baid_data;
 581         struct iwl_mvm_reorder_buffer *buffer;
 582         struct sk_buff *tail;
 583         u32 reorder = le32_to_cpu(desc->reorder_data);
 584         bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
 585         bool last_subframe =
 586                 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
 587         u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 588         u8 sub_frame_idx = desc->amsdu_info &
 589                            IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
 590         int index;
 591         u16 nssn, sn;
 592         u8 baid;
 593
 594         baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
 595                 IWL_RX_MPDU_REORDER_BAID_SHIFT;
 596
 597         /*
 598          * This also covers the case of receiving a Block Ack Request
 599          * outside a BA session; we'll pass it to mac80211 and that
 600          * then sends a delBA action frame.
 601          */
 602         if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
 603                 return false;
 604
 605         /* no sta yet */
 606         if (WARN_ON(IS_ERR_OR_NULL(sta)))
 607                 return false;
 608
 609         mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 610
 611         /* not a data packet or a bar */
 612         if (!ieee80211_is_back_req(hdr->frame_control) &&
 613             (!ieee80211_is_data_qos(hdr->frame_control) ||
 614              is_multicast_ether_addr(hdr->addr1)))
 615                 return false;
 616
 617         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 618                 return false;
 619
 620         baid_data = rcu_dereference(mvm->baid_map[baid]);
 621         if (WARN(!baid_data,
 622                  "Received baid %d, but no data exists for this BAID\n", baid))
 623                 return false;
 624         if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
 625                  "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
 626                  baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
 627                  tid))
 628                 return false;
 629
 630         nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
 631         sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
 632                 IWL_RX_MPDU_REORDER_SN_SHIFT;
 633
 634         buffer = &baid_data->reorder_buf[queue];
 635
 636         spin_lock_bh(&buffer->lock);
 637
 638         if (ieee80211_is_back_req(hdr->frame_control)) {
 639                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 640                 goto drop;
 641         }
 642
 643         /*
 644          * If there was a significant jump in the nssn - adjust.
 645          * If the SN is smaller than the NSSN it might need to first go into
 646          * the reorder buffer, in which case we just release up to it and the
 647          * rest of the function will take of storing it and releasing up to the
 648          * nssn
 649          */
 650         if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
 651                                 buffer->buf_size)) {
 652                 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
 653
 654                 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
 655         }
 656
 657         /* drop any oudated packets */
 658         if (ieee80211_sn_less(sn, buffer->head_sn))
 659                 goto drop;
 660
 661         /* release immediately if allowed by nssn and no stored frames */
 662         if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
 663                 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
 664                                        buffer->buf_size) &&
 665                    (!amsdu || last_subframe))
 666                         buffer->head_sn = nssn;
 667                 /* No need to update AMSDU last SN - we are moving the head */
 668                 spin_unlock_bh(&buffer->lock);
 669                 return false;
 670         }
 671
 672         index = sn % buffer->buf_size;
 673
 674         /*
 675          * Check if we already stored this frame
 676          * As AMSDU is either received or not as whole, logic is simple:
 677          * If we have frames in that position in the buffer and the last frame
 678          * originated from AMSDU had a different SN then it is a retransmission.
 679          * If it is the same SN then if the subframe index is incrementing it
 680          * is the same AMSDU - otherwise it is a retransmission.
 681          */
 682         tail = skb_peek_tail(&buffer->entries[index]);
 683         if (tail && !amsdu)
 684                 goto drop;
 685         else if (tail && (sn != buffer->last_amsdu ||
 686                           buffer->last_sub_index >= sub_frame_idx))
 687                 goto drop;
 688
 689         /* put in reorder buffer */
 690         __skb_queue_tail(&buffer->entries[index], skb);
 691         buffer->num_stored++;
 692         buffer->reorder_time[index] = jiffies;
 693
 694         if (amsdu) {
 695                 buffer->last_amsdu = sn;
 696                 buffer->last_sub_index = sub_frame_idx;
 697         }
 698
 699         /*
 700          * We cannot trust NSSN for AMSDU sub-frames that are not the last.
 701          * The reason is that NSSN advances on the first sub-frame, and may
 702          * cause the reorder buffer to advance before all the sub-frames arrive.
 703          * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
 704          * SN 1. NSSN for first sub frame will be 3 with the result of driver
 705          * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
 706          * already ahead and it will be dropped.
 707          * If the last sub-frame is not on this queue - we will get frame
 708          * release notification with up to date NSSN.
 709          */
 710         if (!amsdu || last_subframe)
 711                 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
 712
 713         spin_unlock_bh(&buffer->lock);
 714         return true;
 715
 716 drop:
 717         kfree_skb(skb);
 718         spin_unlock_bh(&buffer->lock);
 719         return true;
 720 }
 721
 722 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid)
 723 {
 724         unsigned long now = jiffies;
 725         unsigned long timeout;
 726         struct iwl_mvm_baid_data *data;
 727
 728         rcu_read_lock();
 729
 730         data = rcu_dereference(mvm->baid_map[baid]);
 731         if (WARN_ON(!data))
 732                 goto out;
 733
 734         if (!data->timeout)
 735                 goto out;
 736
 737         timeout = data->timeout;
 738         /*
 739          * Do not update last rx all the time to avoid cache bouncing
 740          * between the rx queues.
 741          * Update it every timeout. Worst case is the session will
 742          * expire after ~ 2 * timeout, which doesn't matter that much.
 743          */
 744         if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
 745                 /* Update is atomic */
 746                 data->last_rx = now;
 747
 748 out:
 749         rcu_read_unlock();
 750 }
 751
 752 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
 753                         struct iwl_rx_cmd_buffer *rxb, int queue)
 754 {
 755         struct ieee80211_rx_status *rx_status;
 756         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 757         struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
 758         struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
 759         u32 len = le16_to_cpu(desc->mpdu_len);
 760         u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
 761         u16 phy_info = le16_to_cpu(desc->phy_info);
 762         struct ieee80211_sta *sta = NULL;
 763         struct sk_buff *skb;
 764         u8 crypt_len = 0;
 765
 766         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 767          * ieee80211_hdr pulled.
 768          */
 769         skb = alloc_skb(128, GFP_ATOMIC);
 770         if (!skb) {
 771                 IWL_ERR(mvm, "alloc_skb failed\n");
 772                 return;
 773         }
 774
 775         rx_status = IEEE80211_SKB_RXCB(skb);
 776
 777         if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
 778                 kfree_skb(skb);
 779                 return;
 780         }
 781
 782         /*
 783          * Keep packets with CRC errors (and with overrun) for monitor mode
 784          * (otherwise the firmware discards them) but mark them as bad.
 785          */
 786         if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
 787             !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
 788                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
 789                              le16_to_cpu(desc->status));
 790                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 791         }
 792         /* set the preamble flag if appropriate */
 793         if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
 794                 rx_status->flag |= RX_FLAG_SHORTPRE;
 795
 796         if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
 797                 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
 798                 /* TSF as indicated by the firmware is at INA time */
 799                 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 800         }
 801         rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
 802         rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
 803                                                NL80211_BAND_2GHZ;
 804         rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
 805                                                          rx_status->band);
 806         iwl_mvm_get_signal_strength(mvm, desc, rx_status);
 807
 808         /* update aggregation data for monitor sake on default queue */
 809         if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
 810                 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
 811
 812                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 813                 /* toggle is switched whenever new aggregation starts */
 814                 if (toggle_bit != mvm->ampdu_toggle) {
 815                         mvm->ampdu_ref++;
 816                         mvm->ampdu_toggle = toggle_bit;
 817                 }
 818                 rx_status->ampdu_reference = mvm->ampdu_ref;
 819         }
 820
 821         rcu_read_lock();
 822
 823         if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) {
 824                 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
 825
 826                 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
 827                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 828                         if (IS_ERR(sta))
 829                                 sta = NULL;
 830                 }
 831         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 832                 /*
 833                  * This is fine since we prevent two stations with the same
 834                  * address from being added.
 835                  */
 836                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 837         }
 838
 839         if (sta) {
 840                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 841                 struct ieee80211_vif *tx_blocked_vif =
 842                         rcu_dereference(mvm->csa_tx_blocked_vif);
 843                 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
 844                                IWL_RX_MPDU_REORDER_BAID_MASK) >>
 845                                IWL_RX_MPDU_REORDER_BAID_SHIFT);
 846
 847                 /*
 848                  * We have tx blocked stations (with CS bit). If we heard
 849                  * frames from a blocked station on a new channel we can
 850                  * TX to it again.
 851                  */
 852                 if (unlikely(tx_blocked_vif) &&
 853                     tx_blocked_vif == mvmsta->vif) {
 854                         struct iwl_mvm_vif *mvmvif =
 855                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 856
 857                         if (mvmvif->csa_target_freq == rx_status->freq)
 858                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 859                                                                  false);
 860                 }
 861
 862                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 863
 864                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 865                     ieee80211_is_beacon(hdr->frame_control)) {
 866                         struct iwl_fw_dbg_trigger_tlv *trig;
 867                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 868                         bool trig_check;
 869                         s32 rssi;
 870
 871                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 872                                                       FW_DBG_TRIGGER_RSSI);
 873                         rssi_trig = (void *)trig->data;
 874                         rssi = le32_to_cpu(rssi_trig->rssi);
 875
 876                         trig_check =
 877                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 878                                                               trig);
 879                         if (trig_check && rx_status->signal < rssi)
 880                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 881                 }
 882
 883                 if (ieee80211_is_data(hdr->frame_control))
 884                         iwl_mvm_rx_csum(sta, skb, desc);
 885
 886                 if (iwl_mvm_is_dup(sta, queue, rx_status, hdr, desc)) {
 887                         kfree_skb(skb);
 888                         rcu_read_unlock();
 889                         return;
 890                 }
 891
 892                 /*
 893                  * Our hardware de-aggregates AMSDUs but copies the mac header
 894                  * as it to the de-aggregated MPDUs. We need to turn off the
 895                  * AMSDU bit in the QoS control ourselves.
 896                  */
 897                 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
 898                     !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
 899                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 900
 901                         *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 902                         if (!(desc->amsdu_info &
 903                               IWL_RX_MPDU_AMSDU_LAST_SUBFRAME))
 904                                 rx_status->flag |= RX_FLAG_AMSDU_MORE;
 905                 }
 906                 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
 907                         iwl_mvm_agg_rx_received(mvm, baid);
 908         }
 909
 910         /* Set up the HT phy flags */
 911         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 912         case RATE_MCS_CHAN_WIDTH_20:
 913                 break;
 914         case RATE_MCS_CHAN_WIDTH_40:
 915                 rx_status->flag |= RX_FLAG_40MHZ;
 916                 break;
 917         case RATE_MCS_CHAN_WIDTH_80:
 918                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 919                 break;
 920         case RATE_MCS_CHAN_WIDTH_160:
 921                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 922                 break;
 923         }
 924         if (rate_n_flags & RATE_MCS_SGI_MSK)
 925                 rx_status->flag |= RX_FLAG_SHORT_GI;
 926         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 927                 rx_status->flag |= RX_FLAG_HT_GF;
 928         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 929                 rx_status->flag |= RX_FLAG_LDPC;
 930         if (rate_n_flags & RATE_MCS_HT_MSK) {
 931                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 932                                 RATE_MCS_STBC_POS;
 933                 rx_status->flag |= RX_FLAG_HT;
 934                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 935                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 936         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 937                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 938                                 RATE_MCS_STBC_POS;
 939                 rx_status->vht_nss =
 940                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 941                                                 RATE_VHT_MCS_NSS_POS) + 1;
 942                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 943                 rx_status->flag |= RX_FLAG_VHT;
 944                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 945                 if (rate_n_flags & RATE_MCS_BF_MSK)
 946                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 947         } else {
 948                 rx_status->rate_idx =
 949                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 950                                                             rx_status->band);
 951         }
 952
 953         /* management stuff on default queue */
 954         if (!queue) {
 955                 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 956                               ieee80211_is_probe_resp(hdr->frame_control)) &&
 957                              mvm->sched_scan_pass_all ==
 958                              SCHED_SCAN_PASS_ALL_ENABLED))
 959                         mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 960
 961                 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 962                              ieee80211_is_probe_resp(hdr->frame_control)))
 963                         rx_status->boottime_ns = ktime_get_boot_ns();
 964         }
 965
 966         iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
 967         if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
 968                 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
 969         rcu_read_unlock();
 970 }
 971
 972 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 973                               struct iwl_rx_cmd_buffer *rxb, int queue)
 974 {
 975         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 976         struct iwl_frame_release *release = (void *)pkt->data;
 977         struct ieee80211_sta *sta;
 978         struct iwl_mvm_reorder_buffer *reorder_buf;
 979         struct iwl_mvm_baid_data *ba_data;
 980
 981         int baid = release->baid;
 982
 983         IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
 984                      release->baid, le16_to_cpu(release->nssn));
 985
 986         if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
 987                 return;
 988
 989         rcu_read_lock();
 990
 991         ba_data = rcu_dereference(mvm->baid_map[baid]);
 992         if (WARN_ON_ONCE(!ba_data))
 993                 goto out;
 994
 995         sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
 996         if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
 997                 goto out;
 998
 999         reorder_buf = &ba_data->reorder_buf[queue];
1000
1001         spin_lock_bh(&reorder_buf->lock);
1002         iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
1003                                le16_to_cpu(release->nssn));
1004         spin_unlock_bh(&reorder_buf->lock);
1005
1006 out:
1007         rcu_read_unlock();
1008 }