drivers/net/wireless/ath/ath6kl/txrx.c

   1 /*
   2  * Copyright (c) 2004-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include "core.h"
  21 #include "debug.h"
  22 #include "htc-ops.h"
  23
  24 /*
  25  * tid - tid_mux0..tid_mux3
  26  * aid - tid_mux4..tid_mux7
  27  */
  28 #define ATH6KL_TID_MASK 0xf
  29 #define ATH6KL_AID_SHIFT 4
  30
  31 static inline u8 ath6kl_get_tid(u8 tid_mux)
  32 {
  33         return tid_mux & ATH6KL_TID_MASK;
  34 }
  35
  36 static inline u8 ath6kl_get_aid(u8 tid_mux)
  37 {
  38         return tid_mux >> ATH6KL_AID_SHIFT;
  39 }
  40
  41 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
  42                                u32 *map_no)
  43 {
  44         struct ath6kl *ar = ath6kl_priv(dev);
  45         struct ethhdr *eth_hdr;
  46         u32 i, ep_map = -1;
  47         u8 *datap;
  48
  49         *map_no = 0;
  50         datap = skb->data;
  51         eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
  52
  53         if (is_multicast_ether_addr(eth_hdr->h_dest))
  54                 return ENDPOINT_2;
  55
  56         for (i = 0; i < ar->node_num; i++) {
  57                 if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
  58                            ETH_ALEN) == 0) {
  59                         *map_no = i + 1;
  60                         ar->node_map[i].tx_pend++;
  61                         return ar->node_map[i].ep_id;
  62                 }
  63
  64                 if ((ep_map == -1) && !ar->node_map[i].tx_pend)
  65                         ep_map = i;
  66         }
  67
  68         if (ep_map == -1) {
  69                 ep_map = ar->node_num;
  70                 ar->node_num++;
  71                 if (ar->node_num > MAX_NODE_NUM)
  72                         return ENDPOINT_UNUSED;
  73         }
  74
  75         memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
  76
  77         for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
  78                 if (!ar->tx_pending[i]) {
  79                         ar->node_map[ep_map].ep_id = i;
  80                         break;
  81                 }
  82
  83                 /*
  84                  * No free endpoint is available, start redistribution on
  85                  * the inuse endpoints.
  86                  */
  87                 if (i == ENDPOINT_5) {
  88                         ar->node_map[ep_map].ep_id = ar->next_ep_id;
  89                         ar->next_ep_id++;
  90                         if (ar->next_ep_id > ENDPOINT_5)
  91                                 ar->next_ep_id = ENDPOINT_2;
  92                 }
  93         }
  94
  95         *map_no = ep_map + 1;
  96         ar->node_map[ep_map].tx_pend++;
  97
  98         return ar->node_map[ep_map].ep_id;
  99 }
 100
 101 static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
 102                                 struct ath6kl_vif *vif,
 103                                 struct sk_buff *skb,
 104                                 u32 *flags)
 105 {
 106         struct ath6kl *ar = vif->ar;
 107         bool is_apsdq_empty = false;
 108         struct ethhdr *datap = (struct ethhdr *) skb->data;
 109         u8 up = 0, traffic_class, *ip_hdr;
 110         u16 ether_type;
 111         struct ath6kl_llc_snap_hdr *llc_hdr;
 112
 113         if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
 114                 /*
 115                  * This tx is because of a uAPSD trigger, determine
 116                  * more and EOSP bit. Set EOSP if queue is empty
 117                  * or sufficient frames are delivered for this trigger.
 118                  */
 119                 spin_lock_bh(&conn->psq_lock);
 120                 if (!skb_queue_empty(&conn->apsdq))
 121                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
 122                 else if (conn->sta_flags & STA_PS_APSD_EOSP)
 123                         *flags |= WMI_DATA_HDR_FLAGS_EOSP;
 124                 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
 125                 spin_unlock_bh(&conn->psq_lock);
 126                 return false;
 127         } else if (!conn->apsd_info)
 128                 return false;
 129
 130         if (test_bit(WMM_ENABLED, &vif->flags)) {
 131                 ether_type = be16_to_cpu(datap->h_proto);
 132                 if (is_ethertype(ether_type)) {
 133                         /* packet is in DIX format  */
 134                         ip_hdr = (u8 *)(datap + 1);
 135                 } else {
 136                         /* packet is in 802.3 format */
 137                         llc_hdr = (struct ath6kl_llc_snap_hdr *)
 138                                                         (datap + 1);
 139                         ether_type = be16_to_cpu(llc_hdr->eth_type);
 140                         ip_hdr = (u8 *)(llc_hdr + 1);
 141                 }
 142
 143                 if (ether_type == IP_ETHERTYPE)
 144                         up = ath6kl_wmi_determine_user_priority(
 145                                                         ip_hdr, 0);
 146         }
 147
 148         traffic_class = ath6kl_wmi_get_traffic_class(up);
 149
 150         if ((conn->apsd_info & (1 << traffic_class)) == 0)
 151                 return false;
 152
 153         /* Queue the frames if the STA is sleeping */
 154         spin_lock_bh(&conn->psq_lock);
 155         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
 156         skb_queue_tail(&conn->apsdq, skb);
 157         spin_unlock_bh(&conn->psq_lock);
 158
 159         /*
 160          * If this is the first pkt getting queued
 161          * for this STA, update the PVB for this STA
 162          */
 163         if (is_apsdq_empty) {
 164                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
 165                                               vif->fw_vif_idx,
 166                                               conn->aid, 1, 0);
 167         }
 168         *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
 169
 170         return true;
 171 }
 172
 173 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
 174                                 struct ath6kl_vif *vif,
 175                                 struct sk_buff *skb,
 176                                 u32 *flags)
 177 {
 178         bool is_psq_empty = false;
 179         struct ath6kl *ar = vif->ar;
 180
 181         if (conn->sta_flags & STA_PS_POLLED) {
 182                 spin_lock_bh(&conn->psq_lock);
 183                 if (!skb_queue_empty(&conn->psq))
 184                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
 185                 spin_unlock_bh(&conn->psq_lock);
 186                 return false;
 187         }
 188
 189         /* Queue the frames if the STA is sleeping */
 190         spin_lock_bh(&conn->psq_lock);
 191         is_psq_empty = skb_queue_empty(&conn->psq);
 192         skb_queue_tail(&conn->psq, skb);
 193         spin_unlock_bh(&conn->psq_lock);
 194
 195         /*
 196          * If this is the first pkt getting queued
 197          * for this STA, update the PVB for this
 198          * STA.
 199          */
 200         if (is_psq_empty)
 201                 ath6kl_wmi_set_pvb_cmd(ar->wmi,
 202                                        vif->fw_vif_idx,
 203                                        conn->aid, 1);
 204         return true;
 205 }
 206
 207 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
 208                                 u32 *flags)
 209 {
 210         struct ethhdr *datap = (struct ethhdr *) skb->data;
 211         struct ath6kl_sta *conn = NULL;
 212         bool ps_queued = false;
 213         struct ath6kl *ar = vif->ar;
 214
 215         if (is_multicast_ether_addr(datap->h_dest)) {
 216                 u8 ctr = 0;
 217                 bool q_mcast = false;
 218
 219                 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
 220                         if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
 221                                 q_mcast = true;
 222                                 break;
 223                         }
 224                 }
 225
 226                 if (q_mcast) {
 227                         /*
 228                          * If this transmit is not because of a Dtim Expiry
 229                          * q it.
 230                          */
 231                         if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
 232                                 bool is_mcastq_empty = false;
 233
 234                                 spin_lock_bh(&ar->mcastpsq_lock);
 235                                 is_mcastq_empty =
 236                                         skb_queue_empty(&ar->mcastpsq);
 237                                 skb_queue_tail(&ar->mcastpsq, skb);
 238                                 spin_unlock_bh(&ar->mcastpsq_lock);
 239
 240                                 /*
 241                                  * If this is the first Mcast pkt getting
 242                                  * queued indicate to the target to set the
 243                                  * BitmapControl LSB of the TIM IE.
 244                                  */
 245                                 if (is_mcastq_empty)
 246                                         ath6kl_wmi_set_pvb_cmd(ar->wmi,
 247                                                                vif->fw_vif_idx,
 248                                                                MCAST_AID, 1);
 249
 250                                 ps_queued = true;
 251                         } else {
 252                                 /*
 253                                  * This transmit is because of Dtim expiry.
 254                                  * Determine if MoreData bit has to be set.
 255                                  */
 256                                 spin_lock_bh(&ar->mcastpsq_lock);
 257                                 if (!skb_queue_empty(&ar->mcastpsq))
 258                                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
 259                                 spin_unlock_bh(&ar->mcastpsq_lock);
 260                         }
 261                 }
 262         } else {
 263                 conn = ath6kl_find_sta(vif, datap->h_dest);
 264                 if (!conn) {
 265                         dev_kfree_skb(skb);
 266
 267                         /* Inform the caller that the skb is consumed */
 268                         return true;
 269                 }
 270
 271                 if (conn->sta_flags & STA_PS_SLEEP) {
 272                         ps_queued = ath6kl_process_uapsdq(conn,
 273                                                 vif, skb, flags);
 274                         if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
 275                                 ps_queued = ath6kl_process_psq(conn,
 276                                                 vif, skb, flags);
 277                 }
 278         }
 279         return ps_queued;
 280 }
 281
 282 /* Tx functions */
 283
 284 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
 285                       enum htc_endpoint_id eid)
 286 {
 287         struct ath6kl *ar = devt;
 288         int status = 0;
 289         struct ath6kl_cookie *cookie = NULL;
 290
 291         if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW)) {
 292                 dev_kfree_skb(skb);
 293                 return -EACCES;
 294         }
 295
 296         if (WARN_ON_ONCE(eid == ENDPOINT_UNUSED ||
 297                          eid >= ENDPOINT_MAX)) {
 298                 status = -EINVAL;
 299                 goto fail_ctrl_tx;
 300         }
 301
 302         spin_lock_bh(&ar->lock);
 303
 304         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 305                    "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
 306                    skb, skb->len, eid);
 307
 308         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
 309                 /*
 310                  * Control endpoint is full, don't allocate resources, we
 311                  * are just going to drop this packet.
 312                  */
 313                 cookie = NULL;
 314                 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
 315                            skb, skb->len);
 316         } else
 317                 cookie = ath6kl_alloc_cookie(ar);
 318
 319         if (cookie == NULL) {
 320                 spin_unlock_bh(&ar->lock);
 321                 status = -ENOMEM;
 322                 goto fail_ctrl_tx;
 323         }
 324
 325         ar->tx_pending[eid]++;
 326
 327         if (eid != ar->ctrl_ep)
 328                 ar->total_tx_data_pend++;
 329
 330         spin_unlock_bh(&ar->lock);
 331
 332         cookie->skb = skb;
 333         cookie->map_no = 0;
 334         set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
 335                          eid, ATH6KL_CONTROL_PKT_TAG);
 336         cookie->htc_pkt.skb = skb;
 337
 338         /*
 339          * This interface is asynchronous, if there is an error, cleanup
 340          * will happen in the TX completion callback.
 341          */
 342         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
 343
 344         return 0;
 345
 346 fail_ctrl_tx:
 347         dev_kfree_skb(skb);
 348         return status;
 349 }
 350
 351 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
 352 {
 353         struct ath6kl *ar = ath6kl_priv(dev);
 354         struct ath6kl_cookie *cookie = NULL;
 355         enum htc_endpoint_id eid = ENDPOINT_UNUSED;
 356         struct ath6kl_vif *vif = netdev_priv(dev);
 357         u32 map_no = 0;
 358         u16 htc_tag = ATH6KL_DATA_PKT_TAG;
 359         u8 ac = 99 ; /* initialize to unmapped ac */
 360         bool chk_adhoc_ps_mapping = false;
 361         int ret;
 362         struct wmi_tx_meta_v2 meta_v2;
 363         void *meta;
 364         u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
 365         u8 meta_ver = 0;
 366         u32 flags = 0;
 367
 368         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 369                    "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
 370                    skb, skb->data, skb->len);
 371
 372         /* If target is not associated */
 373         if (!test_bit(CONNECTED, &vif->flags))
 374                 goto fail_tx;
 375
 376         if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON))
 377                 goto fail_tx;
 378
 379         if (!test_bit(WMI_READY, &ar->flag))
 380                 goto fail_tx;
 381
 382         /* AP mode Power saving processing */
 383         if (vif->nw_type == AP_NETWORK) {
 384                 if (ath6kl_powersave_ap(vif, skb, &flags))
 385                         return 0;
 386         }
 387
 388         if (test_bit(WMI_ENABLED, &ar->flag)) {
 389                 if ((dev->features & NETIF_F_IP_CSUM) &&
 390                     (csum == CHECKSUM_PARTIAL)) {
 391                         csum_start = skb->csum_start -
 392                                         (skb_network_header(skb) - skb->head) +
 393                                         sizeof(struct ath6kl_llc_snap_hdr);
 394                         csum_dest = skb->csum_offset + csum_start;
 395                 }
 396
 397                 if (skb_headroom(skb) < dev->needed_headroom) {
 398                         struct sk_buff *tmp_skb = skb;
 399
 400                         skb = skb_realloc_headroom(skb, dev->needed_headroom);
 401                         kfree_skb(tmp_skb);
 402                         if (skb == NULL) {
 403                                 vif->net_stats.tx_dropped++;
 404                                 return 0;
 405                         }
 406                 }
 407
 408                 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
 409                         ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
 410                         goto fail_tx;
 411                 }
 412
 413                 if ((dev->features & NETIF_F_IP_CSUM) &&
 414                     (csum == CHECKSUM_PARTIAL)) {
 415                         meta_v2.csum_start = csum_start;
 416                         meta_v2.csum_dest = csum_dest;
 417
 418                         /* instruct target to calculate checksum */
 419                         meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
 420                         meta_ver = WMI_META_VERSION_2;
 421                         meta = &meta_v2;
 422                 } else {
 423                         meta_ver = 0;
 424                         meta = NULL;
 425                 }
 426
 427                 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
 428                                 DATA_MSGTYPE, flags, 0,
 429                                 meta_ver,
 430                                 meta, vif->fw_vif_idx);
 431
 432                 if (ret) {
 433                         ath6kl_warn("failed to add wmi data header:%d\n"
 434                                 , ret);
 435                         goto fail_tx;
 436                 }
 437
 438                 if ((vif->nw_type == ADHOC_NETWORK) &&
 439                     ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
 440                         chk_adhoc_ps_mapping = true;
 441                 else {
 442                         /* get the stream mapping */
 443                         ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
 444                                     vif->fw_vif_idx, skb,
 445                                     0, test_bit(WMM_ENABLED, &vif->flags), &ac);
 446                         if (ret)
 447                                 goto fail_tx;
 448                 }
 449         } else
 450                 goto fail_tx;
 451
 452         spin_lock_bh(&ar->lock);
 453
 454         if (chk_adhoc_ps_mapping)
 455                 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
 456         else
 457                 eid = ar->ac2ep_map[ac];
 458
 459         if (eid == 0 || eid == ENDPOINT_UNUSED) {
 460                 ath6kl_err("eid %d is not mapped!\n", eid);
 461                 spin_unlock_bh(&ar->lock);
 462                 goto fail_tx;
 463         }
 464
 465         /* allocate resource for this packet */
 466         cookie = ath6kl_alloc_cookie(ar);
 467
 468         if (!cookie) {
 469                 spin_unlock_bh(&ar->lock);
 470                 goto fail_tx;
 471         }
 472
 473         /* update counts while the lock is held */
 474         ar->tx_pending[eid]++;
 475         ar->total_tx_data_pend++;
 476
 477         spin_unlock_bh(&ar->lock);
 478
 479         if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
 480             skb_cloned(skb)) {
 481                 /*
 482                  * We will touch (move the buffer data to align it. Since the
 483                  * skb buffer is cloned and not only the header is changed, we
 484                  * have to copy it to allow the changes. Since we are copying
 485                  * the data here, we may as well align it by reserving suitable
 486                  * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
 487                  */
 488                 struct sk_buff *nskb;
 489
 490                 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
 491                 if (nskb == NULL)
 492                         goto fail_tx;
 493                 kfree_skb(skb);
 494                 skb = nskb;
 495         }
 496
 497         cookie->skb = skb;
 498         cookie->map_no = map_no;
 499         set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
 500                          eid, htc_tag);
 501         cookie->htc_pkt.skb = skb;
 502
 503         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
 504                         skb->data, skb->len);
 505
 506         /*
 507          * HTC interface is asynchronous, if this fails, cleanup will
 508          * happen in the ath6kl_tx_complete callback.
 509          */
 510         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
 511
 512         return 0;
 513
 514 fail_tx:
 515         dev_kfree_skb(skb);
 516
 517         vif->net_stats.tx_dropped++;
 518         vif->net_stats.tx_aborted_errors++;
 519
 520         return 0;
 521 }
 522
 523 /* indicate tx activity or inactivity on a WMI stream */
 524 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
 525 {
 526         struct ath6kl *ar = devt;
 527         enum htc_endpoint_id eid;
 528         int i;
 529
 530         eid = ar->ac2ep_map[traffic_class];
 531
 532         if (!test_bit(WMI_ENABLED, &ar->flag))
 533                 goto notify_htc;
 534
 535         spin_lock_bh(&ar->lock);
 536
 537         ar->ac_stream_active[traffic_class] = active;
 538
 539         if (active) {
 540                 /*
 541                  * Keep track of the active stream with the highest
 542                  * priority.
 543                  */
 544                 if (ar->ac_stream_pri_map[traffic_class] >
 545                     ar->hiac_stream_active_pri)
 546                         /* set the new highest active priority */
 547                         ar->hiac_stream_active_pri =
 548                                         ar->ac_stream_pri_map[traffic_class];
 549
 550         } else {
 551                 /*
 552                  * We may have to search for the next active stream
 553                  * that is the highest priority.
 554                  */
 555                 if (ar->hiac_stream_active_pri ==
 556                         ar->ac_stream_pri_map[traffic_class]) {
 557                         /*
 558                          * The highest priority stream just went inactive
 559                          * reset and search for the "next" highest "active"
 560                          * priority stream.
 561                          */
 562                         ar->hiac_stream_active_pri = 0;
 563
 564                         for (i = 0; i < WMM_NUM_AC; i++) {
 565                                 if (ar->ac_stream_active[i] &&
 566                                     (ar->ac_stream_pri_map[i] >
 567                                      ar->hiac_stream_active_pri))
 568                                         /*
 569                                          * Set the new highest active
 570                                          * priority.
 571                                          */
 572                                         ar->hiac_stream_active_pri =
 573                                                 ar->ac_stream_pri_map[i];
 574                         }
 575                 }
 576         }
 577
 578         spin_unlock_bh(&ar->lock);
 579
 580 notify_htc:
 581         /* notify HTC, this may cause credit distribution changes */
 582         ath6kl_htc_activity_changed(ar->htc_target, eid, active);
 583 }
 584
 585 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
 586                                                struct htc_packet *packet)
 587 {
 588         struct ath6kl *ar = target->dev->ar;
 589         struct ath6kl_vif *vif;
 590         enum htc_endpoint_id endpoint = packet->endpoint;
 591         enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
 592
 593         if (endpoint == ar->ctrl_ep) {
 594                 /*
 595                  * Under normal WMI if this is getting full, then something
 596                  * is running rampant the host should not be exhausting the
 597                  * WMI queue with too many commands the only exception to
 598                  * this is during testing using endpointping.
 599                  */
 600                 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
 601                 ath6kl_err("wmi ctrl ep is full\n");
 602                 ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL);
 603                 return action;
 604         }
 605
 606         if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
 607                 return action;
 608
 609         /*
 610          * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
 611          * the highest active stream.
 612          */
 613         if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
 614             ar->hiac_stream_active_pri &&
 615             ar->cookie_count <=
 616                         target->endpoint[endpoint].tx_drop_packet_threshold)
 617                 /*
 618                  * Give preference to the highest priority stream by
 619                  * dropping the packets which overflowed.
 620                  */
 621                 action = HTC_SEND_FULL_DROP;
 622
 623         /* FIXME: Locking */
 624         spin_lock_bh(&ar->list_lock);
 625         list_for_each_entry(vif, &ar->vif_list, list) {
 626                 if (vif->nw_type == ADHOC_NETWORK ||
 627                     action != HTC_SEND_FULL_DROP) {
 628                         spin_unlock_bh(&ar->list_lock);
 629
 630                         set_bit(NETQ_STOPPED, &vif->flags);
 631                         netif_stop_queue(vif->ndev);
 632
 633                         return action;
 634                 }
 635         }
 636         spin_unlock_bh(&ar->list_lock);
 637
 638         return action;
 639 }
 640
 641 /* TODO this needs to be looked at */
 642 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
 643                                      enum htc_endpoint_id eid, u32 map_no)
 644 {
 645         struct ath6kl *ar = vif->ar;
 646         u32 i;
 647
 648         if (vif->nw_type != ADHOC_NETWORK)
 649                 return;
 650
 651         if (!ar->ibss_ps_enable)
 652                 return;
 653
 654         if (eid == ar->ctrl_ep)
 655                 return;
 656
 657         if (map_no == 0)
 658                 return;
 659
 660         map_no--;
 661         ar->node_map[map_no].tx_pend--;
 662
 663         if (ar->node_map[map_no].tx_pend)
 664                 return;
 665
 666         if (map_no != (ar->node_num - 1))
 667                 return;
 668
 669         for (i = ar->node_num; i > 0; i--) {
 670                 if (ar->node_map[i - 1].tx_pend)
 671                         break;
 672
 673                 memset(&ar->node_map[i - 1], 0,
 674                        sizeof(struct ath6kl_node_mapping));
 675                 ar->node_num--;
 676         }
 677 }
 678
 679 void ath6kl_tx_complete(struct htc_target *target,
 680                         struct list_head *packet_queue)
 681 {
 682         struct ath6kl *ar = target->dev->ar;
 683         struct sk_buff_head skb_queue;
 684         struct htc_packet *packet;
 685         struct sk_buff *skb;
 686         struct ath6kl_cookie *ath6kl_cookie;
 687         u32 map_no = 0;
 688         int status;
 689         enum htc_endpoint_id eid;
 690         bool wake_event = false;
 691         bool flushing[ATH6KL_VIF_MAX] = {false};
 692         u8 if_idx;
 693         struct ath6kl_vif *vif;
 694
 695         skb_queue_head_init(&skb_queue);
 696
 697         /* lock the driver as we update internal state */
 698         spin_lock_bh(&ar->lock);
 699
 700         /* reap completed packets */
 701         while (!list_empty(packet_queue)) {
 702
 703                 packet = list_first_entry(packet_queue, struct htc_packet,
 704                                           list);
 705                 list_del(&packet->list);
 706
 707                 if (WARN_ON_ONCE(packet->endpoint == ENDPOINT_UNUSED ||
 708                                  packet->endpoint >= ENDPOINT_MAX))
 709                         continue;
 710
 711                 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
 712                 if (WARN_ON_ONCE(!ath6kl_cookie))
 713                         continue;
 714
 715                 status = packet->status;
 716                 skb = ath6kl_cookie->skb;
 717                 eid = packet->endpoint;
 718                 map_no = ath6kl_cookie->map_no;
 719
 720                 if (WARN_ON_ONCE(!skb || !skb->data)) {
 721                         dev_kfree_skb(skb);
 722                         ath6kl_free_cookie(ar, ath6kl_cookie);
 723                         continue;
 724                 }
 725
 726                 __skb_queue_tail(&skb_queue, skb);
 727
 728                 if (WARN_ON_ONCE(!status && (packet->act_len != skb->len))) {
 729                         ath6kl_free_cookie(ar, ath6kl_cookie);
 730                         continue;
 731                 }
 732
 733                 ar->tx_pending[eid]--;
 734
 735                 if (eid != ar->ctrl_ep)
 736                         ar->total_tx_data_pend--;
 737
 738                 if (eid == ar->ctrl_ep) {
 739                         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
 740                                 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
 741
 742                         if (ar->tx_pending[eid] == 0)
 743                                 wake_event = true;
 744                 }
 745
 746                 if (eid == ar->ctrl_ep) {
 747                         if_idx = wmi_cmd_hdr_get_if_idx(
 748                                 (struct wmi_cmd_hdr *) packet->buf);
 749                 } else {
 750                         if_idx = wmi_data_hdr_get_if_idx(
 751                                 (struct wmi_data_hdr *) packet->buf);
 752                 }
 753
 754                 vif = ath6kl_get_vif_by_index(ar, if_idx);
 755                 if (!vif) {
 756                         ath6kl_free_cookie(ar, ath6kl_cookie);
 757                         continue;
 758                 }
 759
 760                 if (status) {
 761                         if (status == -ECANCELED)
 762                                 /* a packet was flushed  */
 763                                 flushing[if_idx] = true;
 764
 765                         vif->net_stats.tx_errors++;
 766
 767                         if (status != -ENOSPC && status != -ECANCELED)
 768                                 ath6kl_warn("tx complete error: %d\n", status);
 769
 770                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 771                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 772                                    __func__, skb, packet->buf, packet->act_len,
 773                                    eid, "error!");
 774                 } else {
 775                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 776                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 777                                    __func__, skb, packet->buf, packet->act_len,
 778                                    eid, "OK");
 779
 780                         flushing[if_idx] = false;
 781                         vif->net_stats.tx_packets++;
 782                         vif->net_stats.tx_bytes += skb->len;
 783                 }
 784
 785                 ath6kl_tx_clear_node_map(vif, eid, map_no);
 786
 787                 ath6kl_free_cookie(ar, ath6kl_cookie);
 788
 789                 if (test_bit(NETQ_STOPPED, &vif->flags))
 790                         clear_bit(NETQ_STOPPED, &vif->flags);
 791         }
 792
 793         spin_unlock_bh(&ar->lock);
 794
 795         __skb_queue_purge(&skb_queue);
 796
 797         /* FIXME: Locking */
 798         spin_lock_bh(&ar->list_lock);
 799         list_for_each_entry(vif, &ar->vif_list, list) {
 800                 if (test_bit(CONNECTED, &vif->flags) &&
 801                     !flushing[vif->fw_vif_idx]) {
 802                         spin_unlock_bh(&ar->list_lock);
 803                         netif_wake_queue(vif->ndev);
 804                         spin_lock_bh(&ar->list_lock);
 805                 }
 806         }
 807         spin_unlock_bh(&ar->list_lock);
 808
 809         if (wake_event)
 810                 wake_up(&ar->event_wq);
 811
 812         return;
 813 }
 814
 815 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
 816 {
 817         int i;
 818
 819         /* flush all the data (non-control) streams */
 820         for (i = 0; i < WMM_NUM_AC; i++)
 821                 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
 822                                       ATH6KL_DATA_PKT_TAG);
 823 }
 824
 825 /* Rx functions */
 826
 827 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
 828                                               struct sk_buff *skb)
 829 {
 830         if (!skb)
 831                 return;
 832
 833         skb->dev = dev;
 834
 835         if (!(skb->dev->flags & IFF_UP)) {
 836                 dev_kfree_skb(skb);
 837                 return;
 838         }
 839
 840         skb->protocol = eth_type_trans(skb, skb->dev);
 841
 842         netif_rx_ni(skb);
 843 }
 844
 845 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
 846 {
 847         struct sk_buff *skb;
 848
 849         while (num) {
 850                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 851                 if (!skb) {
 852                         ath6kl_err("netbuf allocation failed\n");
 853                         return;
 854                 }
 855                 skb_queue_tail(q, skb);
 856                 num--;
 857         }
 858 }
 859
 860 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
 861 {
 862         struct sk_buff *skb = NULL;
 863
 864         if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
 865             (AGGR_NUM_OF_FREE_NETBUFS >> 2))
 866                 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
 867                                      AGGR_NUM_OF_FREE_NETBUFS);
 868
 869         skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
 870
 871         return skb;
 872 }
 873
 874 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
 875 {
 876         struct ath6kl *ar = target->dev->ar;
 877         struct sk_buff *skb;
 878         int rx_buf;
 879         int n_buf_refill;
 880         struct htc_packet *packet;
 881         struct list_head queue;
 882
 883         n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
 884                           ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
 885
 886         if (n_buf_refill <= 0)
 887                 return;
 888
 889         INIT_LIST_HEAD(&queue);
 890
 891         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
 892                    "%s: providing htc with %d buffers at eid=%d\n",
 893                    __func__, n_buf_refill, endpoint);
 894
 895         for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
 896                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 897                 if (!skb)
 898                         break;
 899
 900                 packet = (struct htc_packet *) skb->head;
 901                 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
 902                         size_t len = skb_headlen(skb);
 903                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 904                         skb_set_tail_pointer(skb, len);
 905                 }
 906                 set_htc_rxpkt_info(packet, skb, skb->data,
 907                                    ATH6KL_BUFFER_SIZE, endpoint);
 908                 packet->skb = skb;
 909                 list_add_tail(&packet->list, &queue);
 910         }
 911
 912         if (!list_empty(&queue))
 913                 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
 914 }
 915
 916 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
 917 {
 918         struct htc_packet *packet;
 919         struct sk_buff *skb;
 920
 921         while (count) {
 922                 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
 923                 if (!skb)
 924                         return;
 925
 926                 packet = (struct htc_packet *) skb->head;
 927                 if (!IS_ALIGNED((unsigned long) skb->data, 4)) {
 928                         size_t len = skb_headlen(skb);
 929                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 930                         skb_set_tail_pointer(skb, len);
 931                 }
 932                 set_htc_rxpkt_info(packet, skb, skb->data,
 933                                    ATH6KL_AMSDU_BUFFER_SIZE, 0);
 934                 packet->skb = skb;
 935
 936                 spin_lock_bh(&ar->lock);
 937                 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
 938                 spin_unlock_bh(&ar->lock);
 939                 count--;
 940         }
 941 }
 942
 943 /*
 944  * Callback to allocate a receive buffer for a pending packet. We use a
 945  * pre-allocated list of buffers of maximum AMSDU size (4K).
 946  */
 947 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
 948                                             enum htc_endpoint_id endpoint,
 949                                             int len)
 950 {
 951         struct ath6kl *ar = target->dev->ar;
 952         struct htc_packet *packet = NULL;
 953         struct list_head *pkt_pos;
 954         int refill_cnt = 0, depth = 0;
 955
 956         ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
 957                    __func__, endpoint, len);
 958
 959         if ((len <= ATH6KL_BUFFER_SIZE) ||
 960             (len > ATH6KL_AMSDU_BUFFER_SIZE))
 961                 return NULL;
 962
 963         spin_lock_bh(&ar->lock);
 964
 965         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
 966                 spin_unlock_bh(&ar->lock);
 967                 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
 968                 goto refill_buf;
 969         }
 970
 971         packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
 972                                   struct htc_packet, list);
 973         list_del(&packet->list);
 974         list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
 975                 depth++;
 976
 977         refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
 978         spin_unlock_bh(&ar->lock);
 979
 980         /* set actual endpoint ID */
 981         packet->endpoint = endpoint;
 982
 983 refill_buf:
 984         if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
 985                 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
 986
 987         return packet;
 988 }
 989
 990 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
 991                              struct rxtid *rxtid, struct sk_buff *skb)
 992 {
 993         struct sk_buff *new_skb;
 994         struct ethhdr *hdr;
 995         u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
 996         u8 *framep;
 997
 998         mac_hdr_len = sizeof(struct ethhdr);
 999         framep = skb->data + mac_hdr_len;
1000         amsdu_len = skb->len - mac_hdr_len;
1001
1002         while (amsdu_len > mac_hdr_len) {
1003                 hdr = (struct ethhdr *) framep;
1004                 payload_8023_len = ntohs(hdr->h_proto);
1005
1006                 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
1007                     payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
1008                         ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
1009                                    payload_8023_len);
1010                         break;
1011                 }
1012
1013                 frame_8023_len = payload_8023_len + mac_hdr_len;
1014                 new_skb = aggr_get_free_skb(p_aggr);
1015                 if (!new_skb) {
1016                         ath6kl_err("no buffer available\n");
1017                         break;
1018                 }
1019
1020                 memcpy(new_skb->data, framep, frame_8023_len);
1021                 skb_put(new_skb, frame_8023_len);
1022                 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1023                         ath6kl_err("dot3_2_dix error\n");
1024                         dev_kfree_skb(new_skb);
1025                         break;
1026                 }
1027
1028                 skb_queue_tail(&rxtid->q, new_skb);
1029
1030                 /* Is this the last subframe within this aggregate ? */
1031                 if ((amsdu_len - frame_8023_len) == 0)
1032                         break;
1033
1034                 /* Add the length of A-MSDU subframe padding bytes -
1035                  * Round to nearest word.
1036                  */
1037                 frame_8023_len = ALIGN(frame_8023_len, 4);
1038
1039                 framep += frame_8023_len;
1040                 amsdu_len -= frame_8023_len;
1041         }
1042
1043         dev_kfree_skb(skb);
1044 }
1045
1046 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1047                             u16 seq_no, u8 order)
1048 {
1049         struct sk_buff *skb;
1050         struct rxtid *rxtid;
1051         struct skb_hold_q *node;
1052         u16 idx, idx_end, seq_end;
1053         struct rxtid_stats *stats;
1054
1055         rxtid = &agg_conn->rx_tid[tid];
1056         stats = &agg_conn->stat[tid];
1057
1058         spin_lock_bh(&rxtid->lock);
1059         idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1060
1061         /*
1062          * idx_end is typically the last possible frame in the window,
1063          * but changes to 'the' seq_no, when BAR comes. If seq_no
1064          * is non-zero, we will go up to that and stop.
1065          * Note: last seq no in current window will occupy the same
1066          * index position as index that is just previous to start.
1067          * An imp point : if win_sz is 7, for seq_no space of 4095,
1068          * then, there would be holes when sequence wrap around occurs.
1069          * Target should judiciously choose the win_sz, based on
1070          * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1071          * 2, 4, 8, 16 win_sz works fine).
1072          * We must deque from "idx" to "idx_end", including both.
1073          */
1074         seq_end = seq_no ? seq_no : rxtid->seq_next;
1075         idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1076
1077         do {
1078                 node = &rxtid->hold_q[idx];
1079                 if ((order == 1) && (!node->skb))
1080                         break;
1081
1082                 if (node->skb) {
1083                         if (node->is_amsdu)
1084                                 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1085                                                  node->skb);
1086                         else
1087                                 skb_queue_tail(&rxtid->q, node->skb);
1088                         node->skb = NULL;
1089                 } else
1090                         stats->num_hole++;
1091
1092                 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1093                 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1094         } while (idx != idx_end);
1095
1096         spin_unlock_bh(&rxtid->lock);
1097
1098         stats->num_delivered += skb_queue_len(&rxtid->q);
1099
1100         while ((skb = skb_dequeue(&rxtid->q)))
1101                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1102 }
1103
1104 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1105                                   u16 seq_no,
1106                                   bool is_amsdu, struct sk_buff *frame)
1107 {
1108         struct rxtid *rxtid;
1109         struct rxtid_stats *stats;
1110         struct sk_buff *skb;
1111         struct skb_hold_q *node;
1112         u16 idx, st, cur, end;
1113         bool is_queued = false;
1114         u16 extended_end;
1115
1116         rxtid = &agg_conn->rx_tid[tid];
1117         stats = &agg_conn->stat[tid];
1118
1119         stats->num_into_aggr++;
1120
1121         if (!rxtid->aggr) {
1122                 if (is_amsdu) {
1123                         aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1124                         is_queued = true;
1125                         stats->num_amsdu++;
1126                         while ((skb = skb_dequeue(&rxtid->q)))
1127                                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1128                                                                   skb);
1129                 }
1130                 return is_queued;
1131         }
1132
1133         /* Check the incoming sequence no, if it's in the window */
1134         st = rxtid->seq_next;
1135         cur = seq_no;
1136         end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1137
1138         if (((st < end) && (cur < st || cur > end)) ||
1139             ((st > end) && (cur > end) && (cur < st))) {
1140                 extended_end = (end + rxtid->hold_q_sz - 1) &
1141                         ATH6KL_MAX_SEQ_NO;
1142
1143                 if (((end < extended_end) &&
1144                      (cur < end || cur > extended_end)) ||
1145                     ((end > extended_end) && (cur > extended_end) &&
1146                      (cur < end))) {
1147                         aggr_deque_frms(agg_conn, tid, 0, 0);
1148                         spin_lock_bh(&rxtid->lock);
1149                         if (cur >= rxtid->hold_q_sz - 1)
1150                                 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1151                         else
1152                                 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1153                                                   (rxtid->hold_q_sz - 2 - cur);
1154                         spin_unlock_bh(&rxtid->lock);
1155                 } else {
1156                         /*
1157                          * Dequeue only those frames that are outside the
1158                          * new shifted window.
1159                          */
1160                         if (cur >= rxtid->hold_q_sz - 1)
1161                                 st = cur - (rxtid->hold_q_sz - 1);
1162                         else
1163                                 st = ATH6KL_MAX_SEQ_NO -
1164                                         (rxtid->hold_q_sz - 2 - cur);
1165
1166                         aggr_deque_frms(agg_conn, tid, st, 0);
1167                 }
1168
1169                 stats->num_oow++;
1170         }
1171
1172         idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1173
1174         node = &rxtid->hold_q[idx];
1175
1176         spin_lock_bh(&rxtid->lock);
1177
1178         /*
1179          * Is the cur frame duplicate or something beyond our window(hold_q
1180          * -> which is 2x, already)?
1181          *
1182          * 1. Duplicate is easy - drop incoming frame.
1183          * 2. Not falling in current sliding window.
1184          *  2a. is the frame_seq_no preceding current tid_seq_no?
1185          *      -> drop the frame. perhaps sender did not get our ACK.
1186          *         this is taken care of above.
1187          *  2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1188          *      -> Taken care of it above, by moving window forward.
1189          */
1190         dev_kfree_skb(node->skb);
1191         stats->num_dups++;
1192
1193         node->skb = frame;
1194         is_queued = true;
1195         node->is_amsdu = is_amsdu;
1196         node->seq_no = seq_no;
1197
1198         if (node->is_amsdu)
1199                 stats->num_amsdu++;
1200         else
1201                 stats->num_mpdu++;
1202
1203         spin_unlock_bh(&rxtid->lock);
1204
1205         aggr_deque_frms(agg_conn, tid, 0, 1);
1206
1207         if (agg_conn->timer_scheduled)
1208                 return is_queued;
1209
1210         spin_lock_bh(&rxtid->lock);
1211         for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1212                 if (rxtid->hold_q[idx].skb) {
1213                         /*
1214                          * There is a frame in the queue and no
1215                          * timer so start a timer to ensure that
1216                          * the frame doesn't remain stuck
1217                          * forever.
1218                          */
1219                         agg_conn->timer_scheduled = true;
1220                         mod_timer(&agg_conn->timer,
1221                                   (jiffies + (HZ * AGGR_RX_TIMEOUT) / 1000));
1222                         rxtid->timer_mon = true;
1223                         break;
1224                 }
1225         }
1226         spin_unlock_bh(&rxtid->lock);
1227
1228         return is_queued;
1229 }
1230
1231 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1232                                                  struct ath6kl_sta *conn)
1233 {
1234         struct ath6kl *ar = vif->ar;
1235         bool is_apsdq_empty, is_apsdq_empty_at_start;
1236         u32 num_frames_to_deliver, flags;
1237         struct sk_buff *skb = NULL;
1238
1239         /*
1240          * If the APSD q for this STA is not empty, dequeue and
1241          * send a pkt from the head of the q. Also update the
1242          * More data bit in the WMI_DATA_HDR if there are
1243          * more pkts for this STA in the APSD q.
1244          * If there are no more pkts for this STA,
1245          * update the APSD bitmap for this STA.
1246          */
1247
1248         num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1249                                                     ATH6KL_APSD_FRAME_MASK;
1250         /*
1251          * Number of frames to send in a service period is
1252          * indicated by the station
1253          * in the QOS_INFO of the association request
1254          * If it is zero, send all frames
1255          */
1256         if (!num_frames_to_deliver)
1257                 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1258
1259         spin_lock_bh(&conn->psq_lock);
1260         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1261         spin_unlock_bh(&conn->psq_lock);
1262         is_apsdq_empty_at_start = is_apsdq_empty;
1263
1264         while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1265
1266                 spin_lock_bh(&conn->psq_lock);
1267                 skb = skb_dequeue(&conn->apsdq);
1268                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1269                 spin_unlock_bh(&conn->psq_lock);
1270
1271                 /*
1272                  * Set the STA flag to Trigger delivery,
1273                  * so that the frame will go out
1274                  */
1275                 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1276                 num_frames_to_deliver--;
1277
1278                 /* Last frame in the service period, set EOSP or queue empty */
1279                 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1280                         conn->sta_flags |= STA_PS_APSD_EOSP;
1281
1282                 ath6kl_data_tx(skb, vif->ndev);
1283                 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1284                 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1285         }
1286
1287         if (is_apsdq_empty) {
1288                 if (is_apsdq_empty_at_start)
1289                         flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1290                 else
1291                         flags = 0;
1292
1293                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1294                                               vif->fw_vif_idx,
1295                                               conn->aid, 0, flags);
1296         }
1297
1298         return;
1299 }
1300
1301 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1302 {
1303         struct ath6kl *ar = target->dev->ar;
1304         struct sk_buff *skb = packet->pkt_cntxt;
1305         struct wmi_rx_meta_v2 *meta;
1306         struct wmi_data_hdr *dhdr;
1307         int min_hdr_len;
1308         u8 meta_type, dot11_hdr = 0;
1309         u8 pad_before_data_start;
1310         int status = packet->status;
1311         enum htc_endpoint_id ept = packet->endpoint;
1312         bool is_amsdu, prev_ps, ps_state = false;
1313         bool trig_state = false;
1314         struct ath6kl_sta *conn = NULL;
1315         struct sk_buff *skb1 = NULL;
1316         struct ethhdr *datap = NULL;
1317         struct ath6kl_vif *vif;
1318         struct aggr_info_conn *aggr_conn;
1319         u16 seq_no, offset;
1320         u8 tid, if_idx;
1321
1322         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1323                    "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1324                    __func__, ar, ept, skb, packet->buf,
1325                    packet->act_len, status);
1326
1327         if (status || !(skb->data + HTC_HDR_LENGTH)) {
1328                 dev_kfree_skb(skb);
1329                 return;
1330         }
1331
1332         skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1333         skb_pull(skb, HTC_HDR_LENGTH);
1334
1335         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1336                         skb->data, skb->len);
1337
1338         if (ept == ar->ctrl_ep) {
1339                 if (test_bit(WMI_ENABLED, &ar->flag)) {
1340                         ath6kl_check_wow_status(ar);
1341                         ath6kl_wmi_control_rx(ar->wmi, skb);
1342                         return;
1343                 }
1344                 if_idx =
1345                 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1346         } else {
1347                 if_idx =
1348                 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1349         }
1350
1351         vif = ath6kl_get_vif_by_index(ar, if_idx);
1352         if (!vif) {
1353                 dev_kfree_skb(skb);
1354                 return;
1355         }
1356
1357         /*
1358          * Take lock to protect buffer counts and adaptive power throughput
1359          * state.
1360          */
1361         spin_lock_bh(&vif->if_lock);
1362
1363         vif->net_stats.rx_packets++;
1364         vif->net_stats.rx_bytes += packet->act_len;
1365
1366         spin_unlock_bh(&vif->if_lock);
1367
1368         skb->dev = vif->ndev;
1369
1370         if (!test_bit(WMI_ENABLED, &ar->flag)) {
1371                 if (EPPING_ALIGNMENT_PAD > 0)
1372                         skb_pull(skb, EPPING_ALIGNMENT_PAD);
1373                 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1374                 return;
1375         }
1376
1377         ath6kl_check_wow_status(ar);
1378
1379         min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1380                       sizeof(struct ath6kl_llc_snap_hdr);
1381
1382         dhdr = (struct wmi_data_hdr *) skb->data;
1383
1384         /*
1385          * In the case of AP mode we may receive NULL data frames
1386          * that do not have LLC hdr. They are 16 bytes in size.
1387          * Allow these frames in the AP mode.
1388          */
1389         if (vif->nw_type != AP_NETWORK &&
1390             ((packet->act_len < min_hdr_len) ||
1391              (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1392                 ath6kl_info("frame len is too short or too long\n");
1393                 vif->net_stats.rx_errors++;
1394                 vif->net_stats.rx_length_errors++;
1395                 dev_kfree_skb(skb);
1396                 return;
1397         }
1398
1399         /* Get the Power save state of the STA */
1400         if (vif->nw_type == AP_NETWORK) {
1401                 meta_type = wmi_data_hdr_get_meta(dhdr);
1402
1403                 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1404                               WMI_DATA_HDR_PS_MASK);
1405
1406                 offset = sizeof(struct wmi_data_hdr);
1407                 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1408
1409                 switch (meta_type) {
1410                 case 0:
1411                         break;
1412                 case WMI_META_VERSION_1:
1413                         offset += sizeof(struct wmi_rx_meta_v1);
1414                         break;
1415                 case WMI_META_VERSION_2:
1416                         offset += sizeof(struct wmi_rx_meta_v2);
1417                         break;
1418                 default:
1419                         break;
1420                 }
1421
1422                 datap = (struct ethhdr *) (skb->data + offset);
1423                 conn = ath6kl_find_sta(vif, datap->h_source);
1424
1425                 if (!conn) {
1426                         dev_kfree_skb(skb);
1427                         return;
1428                 }
1429
1430                 /*
1431                  * If there is a change in PS state of the STA,
1432                  * take appropriate steps:
1433                  *
1434                  * 1. If Sleep-->Awake, flush the psq for the STA
1435                  *    Clear the PVB for the STA.
1436                  * 2. If Awake-->Sleep, Starting queueing frames
1437                  *    the STA.
1438                  */
1439                 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1440
1441                 if (ps_state)
1442                         conn->sta_flags |= STA_PS_SLEEP;
1443                 else
1444                         conn->sta_flags &= ~STA_PS_SLEEP;
1445
1446                 /* Accept trigger only when the station is in sleep */
1447                 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1448                         ath6kl_uapsd_trigger_frame_rx(vif, conn);
1449
1450                 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1451                         if (!(conn->sta_flags & STA_PS_SLEEP)) {
1452                                 struct sk_buff *skbuff = NULL;
1453                                 bool is_apsdq_empty;
1454                                 struct ath6kl_mgmt_buff *mgmt;
1455                                 u8 idx;
1456
1457                                 spin_lock_bh(&conn->psq_lock);
1458                                 while (conn->mgmt_psq_len > 0) {
1459                                         mgmt = list_first_entry(
1460                                                         &conn->mgmt_psq,
1461                                                         struct ath6kl_mgmt_buff,
1462                                                         list);
1463                                         list_del(&mgmt->list);
1464                                         conn->mgmt_psq_len--;
1465                                         spin_unlock_bh(&conn->psq_lock);
1466                                         idx = vif->fw_vif_idx;
1467
1468                                         ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1469                                                                  idx,
1470                                                                  mgmt->id,
1471                                                                  mgmt->freq,
1472                                                                  mgmt->wait,
1473                                                                  mgmt->buf,
1474                                                                  mgmt->len,
1475                                                                  mgmt->no_cck);
1476
1477                                         kfree(mgmt);
1478                                         spin_lock_bh(&conn->psq_lock);
1479                                 }
1480                                 conn->mgmt_psq_len = 0;
1481                                 while ((skbuff = skb_dequeue(&conn->psq))) {
1482                                         spin_unlock_bh(&conn->psq_lock);
1483                                         ath6kl_data_tx(skbuff, vif->ndev);
1484                                         spin_lock_bh(&conn->psq_lock);
1485                                 }
1486
1487                                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1488                                 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1489                                         spin_unlock_bh(&conn->psq_lock);
1490                                         ath6kl_data_tx(skbuff, vif->ndev);
1491                                         spin_lock_bh(&conn->psq_lock);
1492                                 }
1493                                 spin_unlock_bh(&conn->psq_lock);
1494
1495                                 if (!is_apsdq_empty)
1496                                         ath6kl_wmi_set_apsd_bfrd_traf(
1497                                                         ar->wmi,
1498                                                         vif->fw_vif_idx,
1499                                                         conn->aid, 0, 0);
1500
1501                                 /* Clear the PVB for this STA */
1502                                 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1503                                                        conn->aid, 0);
1504                         }
1505                 }
1506
1507                 /* drop NULL data frames here */
1508                 if ((packet->act_len < min_hdr_len) ||
1509                     (packet->act_len >
1510                      WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1511                         dev_kfree_skb(skb);
1512                         return;
1513                 }
1514         }
1515
1516         is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1517         tid = wmi_data_hdr_get_up(dhdr);
1518         seq_no = wmi_data_hdr_get_seqno(dhdr);
1519         meta_type = wmi_data_hdr_get_meta(dhdr);
1520         dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1521         pad_before_data_start =
1522                 (le16_to_cpu(dhdr->info3) >> WMI_DATA_HDR_PAD_BEFORE_DATA_SHIFT)
1523                         & WMI_DATA_HDR_PAD_BEFORE_DATA_MASK;
1524
1525         skb_pull(skb, sizeof(struct wmi_data_hdr));
1526
1527         switch (meta_type) {
1528         case WMI_META_VERSION_1:
1529                 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1530                 break;
1531         case WMI_META_VERSION_2:
1532                 meta = (struct wmi_rx_meta_v2 *) skb->data;
1533                 if (meta->csum_flags & 0x1) {
1534                         skb->ip_summed = CHECKSUM_COMPLETE;
1535                         skb->csum = (__force __wsum) meta->csum;
1536                 }
1537                 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1538                 break;
1539         default:
1540                 break;
1541         }
1542
1543         skb_pull(skb, pad_before_data_start);
1544
1545         if (dot11_hdr)
1546                 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1547         else if (!is_amsdu)
1548                 status = ath6kl_wmi_dot3_2_dix(skb);
1549
1550         if (status) {
1551                 /*
1552                  * Drop frames that could not be processed (lack of
1553                  * memory, etc.)
1554                  */
1555                 dev_kfree_skb(skb);
1556                 return;
1557         }
1558
1559         if (!(vif->ndev->flags & IFF_UP)) {
1560                 dev_kfree_skb(skb);
1561                 return;
1562         }
1563
1564         if (vif->nw_type == AP_NETWORK) {
1565                 datap = (struct ethhdr *) skb->data;
1566                 if (is_multicast_ether_addr(datap->h_dest))
1567                         /*
1568                          * Bcast/Mcast frames should be sent to the
1569                          * OS stack as well as on the air.
1570                          */
1571                         skb1 = skb_copy(skb, GFP_ATOMIC);
1572                 else {
1573                         /*
1574                          * Search for a connected STA with dstMac
1575                          * as the Mac address. If found send the
1576                          * frame to it on the air else send the
1577                          * frame up the stack.
1578                          */
1579                         conn = ath6kl_find_sta(vif, datap->h_dest);
1580
1581                         if (conn && ar->intra_bss) {
1582                                 skb1 = skb;
1583                                 skb = NULL;
1584                         } else if (conn && !ar->intra_bss) {
1585                                 dev_kfree_skb(skb);
1586                                 skb = NULL;
1587                         }
1588                 }
1589                 if (skb1)
1590                         ath6kl_data_tx(skb1, vif->ndev);
1591
1592                 if (skb == NULL) {
1593                         /* nothing to deliver up the stack */
1594                         return;
1595                 }
1596         }
1597
1598         datap = (struct ethhdr *) skb->data;
1599
1600         if (is_unicast_ether_addr(datap->h_dest)) {
1601                 if (vif->nw_type == AP_NETWORK) {
1602                         conn = ath6kl_find_sta(vif, datap->h_source);
1603                         if (!conn)
1604                                 return;
1605                         aggr_conn = conn->aggr_conn;
1606                 } else
1607                         aggr_conn = vif->aggr_cntxt->aggr_conn;
1608
1609                 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1610                                           is_amsdu, skb)) {
1611                         /* aggregation code will handle the skb */
1612                         return;
1613                 }
1614         } else if (!is_broadcast_ether_addr(datap->h_dest))
1615                 vif->net_stats.multicast++;
1616
1617         ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1618 }
1619
1620 static void aggr_timeout(unsigned long arg)
1621 {
1622         u8 i, j;
1623         struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1624         struct rxtid *rxtid;
1625         struct rxtid_stats *stats;
1626
1627         for (i = 0; i < NUM_OF_TIDS; i++) {
1628                 rxtid = &aggr_conn->rx_tid[i];
1629                 stats = &aggr_conn->stat[i];
1630
1631                 if (!rxtid->aggr || !rxtid->timer_mon)
1632                         continue;
1633
1634                 stats->num_timeouts++;
1635                 ath6kl_dbg(ATH6KL_DBG_AGGR,
1636                            "aggr timeout (st %d end %d)\n",
1637                            rxtid->seq_next,
1638                            ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1639                             ATH6KL_MAX_SEQ_NO));
1640                 aggr_deque_frms(aggr_conn, i, 0, 0);
1641         }
1642
1643         aggr_conn->timer_scheduled = false;
1644
1645         for (i = 0; i < NUM_OF_TIDS; i++) {
1646                 rxtid = &aggr_conn->rx_tid[i];
1647
1648                 if (rxtid->aggr && rxtid->hold_q) {
1649                         spin_lock_bh(&rxtid->lock);
1650                         for (j = 0; j < rxtid->hold_q_sz; j++) {
1651                                 if (rxtid->hold_q[j].skb) {
1652                                         aggr_conn->timer_scheduled = true;
1653                                         rxtid->timer_mon = true;
1654                                         break;
1655                                 }
1656                         }
1657                         spin_unlock_bh(&rxtid->lock);
1658
1659                         if (j >= rxtid->hold_q_sz)
1660                                 rxtid->timer_mon = false;
1661                 }
1662         }
1663
1664         if (aggr_conn->timer_scheduled)
1665                 mod_timer(&aggr_conn->timer,
1666                           jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1667 }
1668
1669 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1670 {
1671         struct rxtid *rxtid;
1672         struct rxtid_stats *stats;
1673
1674         if (!aggr_conn || tid >= NUM_OF_TIDS)
1675                 return;
1676
1677         rxtid = &aggr_conn->rx_tid[tid];
1678         stats = &aggr_conn->stat[tid];
1679
1680         if (rxtid->aggr)
1681                 aggr_deque_frms(aggr_conn, tid, 0, 0);
1682
1683         rxtid->aggr = false;
1684         rxtid->timer_mon = false;
1685         rxtid->win_sz = 0;
1686         rxtid->seq_next = 0;
1687         rxtid->hold_q_sz = 0;
1688
1689         kfree(rxtid->hold_q);
1690         rxtid->hold_q = NULL;
1691
1692         memset(stats, 0, sizeof(struct rxtid_stats));
1693 }
1694
1695 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1696                              u8 win_sz)
1697 {
1698         struct ath6kl_sta *sta;
1699         struct aggr_info_conn *aggr_conn = NULL;
1700         struct rxtid *rxtid;
1701         struct rxtid_stats *stats;
1702         u16 hold_q_size;
1703         u8 tid, aid;
1704
1705         if (vif->nw_type == AP_NETWORK) {
1706                 aid = ath6kl_get_aid(tid_mux);
1707                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1708                 if (sta)
1709                         aggr_conn = sta->aggr_conn;
1710         } else
1711                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1712
1713         if (!aggr_conn)
1714                 return;
1715
1716         tid = ath6kl_get_tid(tid_mux);
1717         if (tid >= NUM_OF_TIDS)
1718                 return;
1719
1720         rxtid = &aggr_conn->rx_tid[tid];
1721         stats = &aggr_conn->stat[tid];
1722
1723         if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1724                 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1725                            __func__, win_sz, tid);
1726
1727         if (rxtid->aggr)
1728                 aggr_delete_tid_state(aggr_conn, tid);
1729
1730         rxtid->seq_next = seq_no;
1731         hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1732         rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1733         if (!rxtid->hold_q)
1734                 return;
1735
1736         rxtid->win_sz = win_sz;
1737         rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1738         if (!skb_queue_empty(&rxtid->q))
1739                 return;
1740
1741         rxtid->aggr = true;
1742 }
1743
1744 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1745                     struct aggr_info_conn *aggr_conn)
1746 {
1747         struct rxtid *rxtid;
1748         u8 i;
1749
1750         aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1751         aggr_conn->dev = vif->ndev;
1752         init_timer(&aggr_conn->timer);
1753         aggr_conn->timer.function = aggr_timeout;
1754         aggr_conn->timer.data = (unsigned long) aggr_conn;
1755         aggr_conn->aggr_info = aggr_info;
1756
1757         aggr_conn->timer_scheduled = false;
1758
1759         for (i = 0; i < NUM_OF_TIDS; i++) {
1760                 rxtid = &aggr_conn->rx_tid[i];
1761                 rxtid->aggr = false;
1762                 rxtid->timer_mon = false;
1763                 skb_queue_head_init(&rxtid->q);
1764                 spin_lock_init(&rxtid->lock);
1765         }
1766
1767 }
1768
1769 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1770 {
1771         struct aggr_info *p_aggr = NULL;
1772
1773         p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1774         if (!p_aggr) {
1775                 ath6kl_err("failed to alloc memory for aggr_node\n");
1776                 return NULL;
1777         }
1778
1779         p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1780         if (!p_aggr->aggr_conn) {
1781                 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1782                 kfree(p_aggr);
1783                 return NULL;
1784         }
1785
1786         aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1787
1788         skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1789         ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1790
1791         return p_aggr;
1792 }
1793
1794 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1795 {
1796         struct ath6kl_sta *sta;
1797         struct rxtid *rxtid;
1798         struct aggr_info_conn *aggr_conn = NULL;
1799         u8 tid, aid;
1800
1801         if (vif->nw_type == AP_NETWORK) {
1802                 aid = ath6kl_get_aid(tid_mux);
1803                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1804                 if (sta)
1805                         aggr_conn = sta->aggr_conn;
1806         } else
1807                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1808
1809         if (!aggr_conn)
1810                 return;
1811
1812         tid = ath6kl_get_tid(tid_mux);
1813         if (tid >= NUM_OF_TIDS)
1814                 return;
1815
1816         rxtid = &aggr_conn->rx_tid[tid];
1817
1818         if (rxtid->aggr)
1819                 aggr_delete_tid_state(aggr_conn, tid);
1820 }
1821
1822 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1823 {
1824         u8 tid;
1825
1826         if (!aggr_conn)
1827                 return;
1828
1829         if (aggr_conn->timer_scheduled) {
1830                 del_timer(&aggr_conn->timer);
1831                 aggr_conn->timer_scheduled = false;
1832         }
1833
1834         for (tid = 0; tid < NUM_OF_TIDS; tid++)
1835                 aggr_delete_tid_state(aggr_conn, tid);
1836 }
1837
1838 /* clean up our amsdu buffer list */
1839 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1840 {
1841         struct htc_packet *packet, *tmp_pkt;
1842
1843         spin_lock_bh(&ar->lock);
1844         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1845                 spin_unlock_bh(&ar->lock);
1846                 return;
1847         }
1848
1849         list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1850                                  list) {
1851                 list_del(&packet->list);
1852                 spin_unlock_bh(&ar->lock);
1853                 dev_kfree_skb(packet->pkt_cntxt);
1854                 spin_lock_bh(&ar->lock);
1855         }
1856
1857         spin_unlock_bh(&ar->lock);
1858 }
1859
1860 void aggr_module_destroy(struct aggr_info *aggr_info)
1861 {
1862         if (!aggr_info)
1863                 return;
1864
1865         aggr_reset_state(aggr_info->aggr_conn);
1866         skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1867         kfree(aggr_info->aggr_conn);
1868         kfree(aggr_info);
1869 }