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