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 #include "core.h"
  19 #include "debug.h"
  20
  21 /*
  22  * tid - tid_mux0..tid_mux3
  23  * aid - tid_mux4..tid_mux7
  24  */
  25 #define ATH6KL_TID_MASK 0xf
  26 #define ATH6KL_AID_SHIFT 4
  27
  28 static inline u8 ath6kl_get_tid(u8 tid_mux)
  29 {
  30         return tid_mux & ATH6KL_TID_MASK;
  31 }
  32
  33 static inline u8 ath6kl_get_aid(u8 tid_mux)
  34 {
  35         return tid_mux >> ATH6KL_AID_SHIFT;
  36 }
  37
  38 static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev,
  39                                u32 *map_no)
  40 {
  41         struct ath6kl *ar = ath6kl_priv(dev);
  42         struct ethhdr *eth_hdr;
  43         u32 i, ep_map = -1;
  44         u8 *datap;
  45
  46         *map_no = 0;
  47         datap = skb->data;
  48         eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr));
  49
  50         if (is_multicast_ether_addr(eth_hdr->h_dest))
  51                 return ENDPOINT_2;
  52
  53         for (i = 0; i < ar->node_num; i++) {
  54                 if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr,
  55                            ETH_ALEN) == 0) {
  56                         *map_no = i + 1;
  57                         ar->node_map[i].tx_pend++;
  58                         return ar->node_map[i].ep_id;
  59                 }
  60
  61                 if ((ep_map == -1) && !ar->node_map[i].tx_pend)
  62                         ep_map = i;
  63         }
  64
  65         if (ep_map == -1) {
  66                 ep_map = ar->node_num;
  67                 ar->node_num++;
  68                 if (ar->node_num > MAX_NODE_NUM)
  69                         return ENDPOINT_UNUSED;
  70         }
  71
  72         memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN);
  73
  74         for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) {
  75                 if (!ar->tx_pending[i]) {
  76                         ar->node_map[ep_map].ep_id = i;
  77                         break;
  78                 }
  79
  80                 /*
  81                  * No free endpoint is available, start redistribution on
  82                  * the inuse endpoints.
  83                  */
  84                 if (i == ENDPOINT_5) {
  85                         ar->node_map[ep_map].ep_id = ar->next_ep_id;
  86                         ar->next_ep_id++;
  87                         if (ar->next_ep_id > ENDPOINT_5)
  88                                 ar->next_ep_id = ENDPOINT_2;
  89                 }
  90         }
  91
  92         *map_no = ep_map + 1;
  93         ar->node_map[ep_map].tx_pend++;
  94
  95         return ar->node_map[ep_map].ep_id;
  96 }
  97
  98 static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn,
  99                                 struct ath6kl_vif *vif,
 100                                 struct sk_buff *skb,
 101                                 u32 *flags)
 102 {
 103         struct ath6kl *ar = vif->ar;
 104         bool is_apsdq_empty = false;
 105         struct ethhdr *datap = (struct ethhdr *) skb->data;
 106         u8 up = 0, traffic_class, *ip_hdr;
 107         u16 ether_type;
 108         struct ath6kl_llc_snap_hdr *llc_hdr;
 109
 110         if (conn->sta_flags & STA_PS_APSD_TRIGGER) {
 111                 /*
 112                  * This tx is because of a uAPSD trigger, determine
 113                  * more and EOSP bit. Set EOSP if queue is empty
 114                  * or sufficient frames are delivered for this trigger.
 115                  */
 116                 spin_lock_bh(&conn->psq_lock);
 117                 if (!skb_queue_empty(&conn->apsdq))
 118                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
 119                 else if (conn->sta_flags & STA_PS_APSD_EOSP)
 120                         *flags |= WMI_DATA_HDR_FLAGS_EOSP;
 121                 *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
 122                 spin_unlock_bh(&conn->psq_lock);
 123                 return false;
 124         } else if (!conn->apsd_info)
 125                 return false;
 126
 127         if (test_bit(WMM_ENABLED, &vif->flags)) {
 128                 ether_type = be16_to_cpu(datap->h_proto);
 129                 if (is_ethertype(ether_type)) {
 130                         /* packet is in DIX format  */
 131                         ip_hdr = (u8 *)(datap + 1);
 132                 } else {
 133                         /* packet is in 802.3 format */
 134                         llc_hdr = (struct ath6kl_llc_snap_hdr *)
 135                                                         (datap + 1);
 136                         ether_type = be16_to_cpu(llc_hdr->eth_type);
 137                         ip_hdr = (u8 *)(llc_hdr + 1);
 138                 }
 139
 140                 if (ether_type == IP_ETHERTYPE)
 141                         up = ath6kl_wmi_determine_user_priority(
 142                                                         ip_hdr, 0);
 143         }
 144
 145         traffic_class = ath6kl_wmi_get_traffic_class(up);
 146
 147         if ((conn->apsd_info & (1 << traffic_class)) == 0)
 148                 return false;
 149
 150         /* Queue the frames if the STA is sleeping */
 151         spin_lock_bh(&conn->psq_lock);
 152         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
 153         skb_queue_tail(&conn->apsdq, skb);
 154         spin_unlock_bh(&conn->psq_lock);
 155
 156         /*
 157          * If this is the first pkt getting queued
 158          * for this STA, update the PVB for this STA
 159          */
 160         if (is_apsdq_empty) {
 161                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
 162                                               vif->fw_vif_idx,
 163                                               conn->aid, 1, 0);
 164         }
 165         *flags |= WMI_DATA_HDR_FLAGS_UAPSD;
 166
 167         return true;
 168 }
 169
 170 static bool ath6kl_process_psq(struct ath6kl_sta *conn,
 171                                 struct ath6kl_vif *vif,
 172                                 struct sk_buff *skb,
 173                                 u32 *flags)
 174 {
 175         bool is_psq_empty = false;
 176         struct ath6kl *ar = vif->ar;
 177
 178         if (conn->sta_flags & STA_PS_POLLED) {
 179                 spin_lock_bh(&conn->psq_lock);
 180                 if (!skb_queue_empty(&conn->psq))
 181                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
 182                 spin_unlock_bh(&conn->psq_lock);
 183                 return false;
 184         }
 185
 186         /* Queue the frames if the STA is sleeping */
 187         spin_lock_bh(&conn->psq_lock);
 188         is_psq_empty = skb_queue_empty(&conn->psq);
 189         skb_queue_tail(&conn->psq, skb);
 190         spin_unlock_bh(&conn->psq_lock);
 191
 192         /*
 193          * If this is the first pkt getting queued
 194          * for this STA, update the PVB for this
 195          * STA.
 196          */
 197         if (is_psq_empty)
 198                 ath6kl_wmi_set_pvb_cmd(ar->wmi,
 199                                        vif->fw_vif_idx,
 200                                        conn->aid, 1);
 201         return true;
 202 }
 203
 204 static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb,
 205                                 u32 *flags)
 206 {
 207         struct ethhdr *datap = (struct ethhdr *) skb->data;
 208         struct ath6kl_sta *conn = NULL;
 209         bool ps_queued = false;
 210         struct ath6kl *ar = vif->ar;
 211
 212         if (is_multicast_ether_addr(datap->h_dest)) {
 213                 u8 ctr = 0;
 214                 bool q_mcast = false;
 215
 216                 for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
 217                         if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) {
 218                                 q_mcast = true;
 219                                 break;
 220                         }
 221                 }
 222
 223                 if (q_mcast) {
 224                         /*
 225                          * If this transmit is not because of a Dtim Expiry
 226                          * q it.
 227                          */
 228                         if (!test_bit(DTIM_EXPIRED, &vif->flags)) {
 229                                 bool is_mcastq_empty = false;
 230
 231                                 spin_lock_bh(&ar->mcastpsq_lock);
 232                                 is_mcastq_empty =
 233                                         skb_queue_empty(&ar->mcastpsq);
 234                                 skb_queue_tail(&ar->mcastpsq, skb);
 235                                 spin_unlock_bh(&ar->mcastpsq_lock);
 236
 237                                 /*
 238                                  * If this is the first Mcast pkt getting
 239                                  * queued indicate to the target to set the
 240                                  * BitmapControl LSB of the TIM IE.
 241                                  */
 242                                 if (is_mcastq_empty)
 243                                         ath6kl_wmi_set_pvb_cmd(ar->wmi,
 244                                                                vif->fw_vif_idx,
 245                                                                MCAST_AID, 1);
 246
 247                                 ps_queued = true;
 248                         } else {
 249                                 /*
 250                                  * This transmit is because of Dtim expiry.
 251                                  * Determine if MoreData bit has to be set.
 252                                  */
 253                                 spin_lock_bh(&ar->mcastpsq_lock);
 254                                 if (!skb_queue_empty(&ar->mcastpsq))
 255                                         *flags |= WMI_DATA_HDR_FLAGS_MORE;
 256                                 spin_unlock_bh(&ar->mcastpsq_lock);
 257                         }
 258                 }
 259         } else {
 260                 conn = ath6kl_find_sta(vif, datap->h_dest);
 261                 if (!conn) {
 262                         dev_kfree_skb(skb);
 263
 264                         /* Inform the caller that the skb is consumed */
 265                         return true;
 266                 }
 267
 268                 if (conn->sta_flags & STA_PS_SLEEP) {
 269                         ps_queued = ath6kl_process_uapsdq(conn,
 270                                                 vif, skb, flags);
 271                         if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD))
 272                                 ps_queued = ath6kl_process_psq(conn,
 273                                                 vif, skb, flags);
 274                 }
 275         }
 276         return ps_queued;
 277 }
 278
 279 /* Tx functions */
 280
 281 int ath6kl_control_tx(void *devt, struct sk_buff *skb,
 282                       enum htc_endpoint_id eid)
 283 {
 284         struct ath6kl *ar = devt;
 285         int status = 0;
 286         struct ath6kl_cookie *cookie = NULL;
 287
 288         if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW))
 289                 return -EACCES;
 290
 291         spin_lock_bh(&ar->lock);
 292
 293         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 294                    "%s: skb=0x%p, len=0x%x eid =%d\n", __func__,
 295                    skb, skb->len, eid);
 296
 297         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) {
 298                 /*
 299                  * Control endpoint is full, don't allocate resources, we
 300                  * are just going to drop this packet.
 301                  */
 302                 cookie = NULL;
 303                 ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n",
 304                            skb, skb->len);
 305         } else
 306                 cookie = ath6kl_alloc_cookie(ar);
 307
 308         if (cookie == NULL) {
 309                 spin_unlock_bh(&ar->lock);
 310                 status = -ENOMEM;
 311                 goto fail_ctrl_tx;
 312         }
 313
 314         ar->tx_pending[eid]++;
 315
 316         if (eid != ar->ctrl_ep)
 317                 ar->total_tx_data_pend++;
 318
 319         spin_unlock_bh(&ar->lock);
 320
 321         cookie->skb = skb;
 322         cookie->map_no = 0;
 323         set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
 324                          eid, ATH6KL_CONTROL_PKT_TAG);
 325
 326         /*
 327          * This interface is asynchronous, if there is an error, cleanup
 328          * will happen in the TX completion callback.
 329          */
 330         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
 331
 332         return 0;
 333
 334 fail_ctrl_tx:
 335         dev_kfree_skb(skb);
 336         return status;
 337 }
 338
 339 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
 340 {
 341         struct ath6kl *ar = ath6kl_priv(dev);
 342         struct ath6kl_cookie *cookie = NULL;
 343         enum htc_endpoint_id eid = ENDPOINT_UNUSED;
 344         struct ath6kl_vif *vif = netdev_priv(dev);
 345         u32 map_no = 0;
 346         u16 htc_tag = ATH6KL_DATA_PKT_TAG;
 347         u8 ac = 99 ; /* initialize to unmapped ac */
 348         bool chk_adhoc_ps_mapping = false;
 349         int ret;
 350         struct wmi_tx_meta_v2 meta_v2;
 351         void *meta;
 352         u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
 353         u8 meta_ver = 0;
 354         u32 flags = 0;
 355
 356         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 357                    "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
 358                    skb, skb->data, skb->len);
 359
 360         /* If target is not associated */
 361         if (!test_bit(CONNECTED, &vif->flags)) {
 362                 dev_kfree_skb(skb);
 363                 return 0;
 364         }
 365
 366         if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON)) {
 367                 dev_kfree_skb(skb);
 368                 return 0;
 369         }
 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
 494         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
 495                         skb->data, skb->len);
 496
 497         /*
 498          * HTC interface is asynchronous, if this fails, cleanup will
 499          * happen in the ath6kl_tx_complete callback.
 500          */
 501         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
 502
 503         return 0;
 504
 505 fail_tx:
 506         dev_kfree_skb(skb);
 507
 508         vif->net_stats.tx_dropped++;
 509         vif->net_stats.tx_aborted_errors++;
 510
 511         return 0;
 512 }
 513
 514 /* indicate tx activity or inactivity on a WMI stream */
 515 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
 516 {
 517         struct ath6kl *ar = devt;
 518         enum htc_endpoint_id eid;
 519         int i;
 520
 521         eid = ar->ac2ep_map[traffic_class];
 522
 523         if (!test_bit(WMI_ENABLED, &ar->flag))
 524                 goto notify_htc;
 525
 526         spin_lock_bh(&ar->lock);
 527
 528         ar->ac_stream_active[traffic_class] = active;
 529
 530         if (active) {
 531                 /*
 532                  * Keep track of the active stream with the highest
 533                  * priority.
 534                  */
 535                 if (ar->ac_stream_pri_map[traffic_class] >
 536                     ar->hiac_stream_active_pri)
 537                         /* set the new highest active priority */
 538                         ar->hiac_stream_active_pri =
 539                                         ar->ac_stream_pri_map[traffic_class];
 540
 541         } else {
 542                 /*
 543                  * We may have to search for the next active stream
 544                  * that is the highest priority.
 545                  */
 546                 if (ar->hiac_stream_active_pri ==
 547                         ar->ac_stream_pri_map[traffic_class]) {
 548                         /*
 549                          * The highest priority stream just went inactive
 550                          * reset and search for the "next" highest "active"
 551                          * priority stream.
 552                          */
 553                         ar->hiac_stream_active_pri = 0;
 554
 555                         for (i = 0; i < WMM_NUM_AC; i++) {
 556                                 if (ar->ac_stream_active[i] &&
 557                                     (ar->ac_stream_pri_map[i] >
 558                                      ar->hiac_stream_active_pri))
 559                                         /*
 560                                          * Set the new highest active
 561                                          * priority.
 562                                          */
 563                                         ar->hiac_stream_active_pri =
 564                                                 ar->ac_stream_pri_map[i];
 565                         }
 566                 }
 567         }
 568
 569         spin_unlock_bh(&ar->lock);
 570
 571 notify_htc:
 572         /* notify HTC, this may cause credit distribution changes */
 573         ath6kl_htc_indicate_activity_change(ar->htc_target, eid, active);
 574 }
 575
 576 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
 577                                                struct htc_packet *packet)
 578 {
 579         struct ath6kl *ar = target->dev->ar;
 580         struct ath6kl_vif *vif;
 581         enum htc_endpoint_id endpoint = packet->endpoint;
 582         enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
 583
 584         if (endpoint == ar->ctrl_ep) {
 585                 /*
 586                  * Under normal WMI if this is getting full, then something
 587                  * is running rampant the host should not be exhausting the
 588                  * WMI queue with too many commands the only exception to
 589                  * this is during testing using endpointping.
 590                  */
 591                 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
 592                 ath6kl_err("wmi ctrl ep is full\n");
 593                 return action;
 594         }
 595
 596         if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
 597                 return action;
 598
 599         /*
 600          * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
 601          * the highest active stream.
 602          */
 603         if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
 604             ar->hiac_stream_active_pri &&
 605             ar->cookie_count <=
 606                         target->endpoint[endpoint].tx_drop_packet_threshold)
 607                 /*
 608                  * Give preference to the highest priority stream by
 609                  * dropping the packets which overflowed.
 610                  */
 611                 action = HTC_SEND_FULL_DROP;
 612
 613         /* FIXME: Locking */
 614         spin_lock_bh(&ar->list_lock);
 615         list_for_each_entry(vif, &ar->vif_list, list) {
 616                 if (vif->nw_type == ADHOC_NETWORK ||
 617                     action != HTC_SEND_FULL_DROP) {
 618                         spin_unlock_bh(&ar->list_lock);
 619
 620                         set_bit(NETQ_STOPPED, &vif->flags);
 621                         netif_stop_queue(vif->ndev);
 622
 623                         return action;
 624                 }
 625         }
 626         spin_unlock_bh(&ar->list_lock);
 627
 628         return action;
 629 }
 630
 631 /* TODO this needs to be looked at */
 632 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
 633                                      enum htc_endpoint_id eid, u32 map_no)
 634 {
 635         struct ath6kl *ar = vif->ar;
 636         u32 i;
 637
 638         if (vif->nw_type != ADHOC_NETWORK)
 639                 return;
 640
 641         if (!ar->ibss_ps_enable)
 642                 return;
 643
 644         if (eid == ar->ctrl_ep)
 645                 return;
 646
 647         if (map_no == 0)
 648                 return;
 649
 650         map_no--;
 651         ar->node_map[map_no].tx_pend--;
 652
 653         if (ar->node_map[map_no].tx_pend)
 654                 return;
 655
 656         if (map_no != (ar->node_num - 1))
 657                 return;
 658
 659         for (i = ar->node_num; i > 0; i--) {
 660                 if (ar->node_map[i - 1].tx_pend)
 661                         break;
 662
 663                 memset(&ar->node_map[i - 1], 0,
 664                        sizeof(struct ath6kl_node_mapping));
 665                 ar->node_num--;
 666         }
 667 }
 668
 669 void ath6kl_tx_complete(void *context, struct list_head *packet_queue)
 670 {
 671         struct ath6kl *ar = context;
 672         struct sk_buff_head skb_queue;
 673         struct htc_packet *packet;
 674         struct sk_buff *skb;
 675         struct ath6kl_cookie *ath6kl_cookie;
 676         u32 map_no = 0;
 677         int status;
 678         enum htc_endpoint_id eid;
 679         bool wake_event = false;
 680         bool flushing[ATH6KL_VIF_MAX] = {false};
 681         u8 if_idx;
 682         struct ath6kl_vif *vif;
 683
 684         skb_queue_head_init(&skb_queue);
 685
 686         /* lock the driver as we update internal state */
 687         spin_lock_bh(&ar->lock);
 688
 689         /* reap completed packets */
 690         while (!list_empty(packet_queue)) {
 691
 692                 packet = list_first_entry(packet_queue, struct htc_packet,
 693                                           list);
 694                 list_del(&packet->list);
 695
 696                 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
 697                 if (!ath6kl_cookie)
 698                         goto fatal;
 699
 700                 status = packet->status;
 701                 skb = ath6kl_cookie->skb;
 702                 eid = packet->endpoint;
 703                 map_no = ath6kl_cookie->map_no;
 704
 705                 if (!skb || !skb->data)
 706                         goto fatal;
 707
 708                 __skb_queue_tail(&skb_queue, skb);
 709
 710                 if (!status && (packet->act_len != skb->len))
 711                         goto fatal;
 712
 713                 ar->tx_pending[eid]--;
 714
 715                 if (eid != ar->ctrl_ep)
 716                         ar->total_tx_data_pend--;
 717
 718                 if (eid == ar->ctrl_ep) {
 719                         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
 720                                 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
 721
 722                         if (ar->tx_pending[eid] == 0)
 723                                 wake_event = true;
 724                 }
 725
 726                 if (eid == ar->ctrl_ep) {
 727                         if_idx = wmi_cmd_hdr_get_if_idx(
 728                                 (struct wmi_cmd_hdr *) packet->buf);
 729                 } else {
 730                         if_idx = wmi_data_hdr_get_if_idx(
 731                                 (struct wmi_data_hdr *) packet->buf);
 732                 }
 733
 734                 vif = ath6kl_get_vif_by_index(ar, if_idx);
 735                 if (!vif) {
 736                         ath6kl_free_cookie(ar, ath6kl_cookie);
 737                         continue;
 738                 }
 739
 740                 if (status) {
 741                         if (status == -ECANCELED)
 742                                 /* a packet was flushed  */
 743                                 flushing[if_idx] = true;
 744
 745                         vif->net_stats.tx_errors++;
 746
 747                         if (status != -ENOSPC && status != -ECANCELED)
 748                                 ath6kl_warn("tx complete error: %d\n", status);
 749
 750                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 751                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 752                                    __func__, skb, packet->buf, packet->act_len,
 753                                    eid, "error!");
 754                 } else {
 755                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 756                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 757                                    __func__, skb, packet->buf, packet->act_len,
 758                                    eid, "OK");
 759
 760                         flushing[if_idx] = false;
 761                         vif->net_stats.tx_packets++;
 762                         vif->net_stats.tx_bytes += skb->len;
 763                 }
 764
 765                 ath6kl_tx_clear_node_map(vif, eid, map_no);
 766
 767                 ath6kl_free_cookie(ar, ath6kl_cookie);
 768
 769                 if (test_bit(NETQ_STOPPED, &vif->flags))
 770                         clear_bit(NETQ_STOPPED, &vif->flags);
 771         }
 772
 773         spin_unlock_bh(&ar->lock);
 774
 775         __skb_queue_purge(&skb_queue);
 776
 777         /* FIXME: Locking */
 778         spin_lock_bh(&ar->list_lock);
 779         list_for_each_entry(vif, &ar->vif_list, list) {
 780                 if (test_bit(CONNECTED, &vif->flags) &&
 781                     !flushing[vif->fw_vif_idx]) {
 782                         spin_unlock_bh(&ar->list_lock);
 783                         netif_wake_queue(vif->ndev);
 784                         spin_lock_bh(&ar->list_lock);
 785                 }
 786         }
 787         spin_unlock_bh(&ar->list_lock);
 788
 789         if (wake_event)
 790                 wake_up(&ar->event_wq);
 791
 792         return;
 793
 794 fatal:
 795         WARN_ON(1);
 796         spin_unlock_bh(&ar->lock);
 797         return;
 798 }
 799
 800 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
 801 {
 802         int i;
 803
 804         /* flush all the data (non-control) streams */
 805         for (i = 0; i < WMM_NUM_AC; i++)
 806                 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
 807                                       ATH6KL_DATA_PKT_TAG);
 808 }
 809
 810 /* Rx functions */
 811
 812 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
 813                                               struct sk_buff *skb)
 814 {
 815         if (!skb)
 816                 return;
 817
 818         skb->dev = dev;
 819
 820         if (!(skb->dev->flags & IFF_UP)) {
 821                 dev_kfree_skb(skb);
 822                 return;
 823         }
 824
 825         skb->protocol = eth_type_trans(skb, skb->dev);
 826
 827         netif_rx_ni(skb);
 828 }
 829
 830 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
 831 {
 832         struct sk_buff *skb;
 833
 834         while (num) {
 835                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 836                 if (!skb) {
 837                         ath6kl_err("netbuf allocation failed\n");
 838                         return;
 839                 }
 840                 skb_queue_tail(q, skb);
 841                 num--;
 842         }
 843 }
 844
 845 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
 846 {
 847         struct sk_buff *skb = NULL;
 848
 849         if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
 850             (AGGR_NUM_OF_FREE_NETBUFS >> 2))
 851                 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
 852                                      AGGR_NUM_OF_FREE_NETBUFS);
 853
 854         skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
 855
 856         return skb;
 857 }
 858
 859 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
 860 {
 861         struct ath6kl *ar = target->dev->ar;
 862         struct sk_buff *skb;
 863         int rx_buf;
 864         int n_buf_refill;
 865         struct htc_packet *packet;
 866         struct list_head queue;
 867
 868         n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
 869                           ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
 870
 871         if (n_buf_refill <= 0)
 872                 return;
 873
 874         INIT_LIST_HEAD(&queue);
 875
 876         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
 877                    "%s: providing htc with %d buffers at eid=%d\n",
 878                    __func__, n_buf_refill, endpoint);
 879
 880         for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
 881                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 882                 if (!skb)
 883                         break;
 884
 885                 packet = (struct htc_packet *) skb->head;
 886                 if (!IS_ALIGNED((unsigned long) skb->data, 4))
 887                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 888                 set_htc_rxpkt_info(packet, skb, skb->data,
 889                                    ATH6KL_BUFFER_SIZE, endpoint);
 890                 list_add_tail(&packet->list, &queue);
 891         }
 892
 893         if (!list_empty(&queue))
 894                 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
 895 }
 896
 897 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
 898 {
 899         struct htc_packet *packet;
 900         struct sk_buff *skb;
 901
 902         while (count) {
 903                 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
 904                 if (!skb)
 905                         return;
 906
 907                 packet = (struct htc_packet *) skb->head;
 908                 if (!IS_ALIGNED((unsigned long) skb->data, 4))
 909                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 910                 set_htc_rxpkt_info(packet, skb, skb->data,
 911                                    ATH6KL_AMSDU_BUFFER_SIZE, 0);
 912                 spin_lock_bh(&ar->lock);
 913                 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
 914                 spin_unlock_bh(&ar->lock);
 915                 count--;
 916         }
 917 }
 918
 919 /*
 920  * Callback to allocate a receive buffer for a pending packet. We use a
 921  * pre-allocated list of buffers of maximum AMSDU size (4K).
 922  */
 923 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
 924                                             enum htc_endpoint_id endpoint,
 925                                             int len)
 926 {
 927         struct ath6kl *ar = target->dev->ar;
 928         struct htc_packet *packet = NULL;
 929         struct list_head *pkt_pos;
 930         int refill_cnt = 0, depth = 0;
 931
 932         ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
 933                    __func__, endpoint, len);
 934
 935         if ((len <= ATH6KL_BUFFER_SIZE) ||
 936             (len > ATH6KL_AMSDU_BUFFER_SIZE))
 937                 return NULL;
 938
 939         spin_lock_bh(&ar->lock);
 940
 941         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
 942                 spin_unlock_bh(&ar->lock);
 943                 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
 944                 goto refill_buf;
 945         }
 946
 947         packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
 948                                   struct htc_packet, list);
 949         list_del(&packet->list);
 950         list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
 951                 depth++;
 952
 953         refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
 954         spin_unlock_bh(&ar->lock);
 955
 956         /* set actual endpoint ID */
 957         packet->endpoint = endpoint;
 958
 959 refill_buf:
 960         if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
 961                 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
 962
 963         return packet;
 964 }
 965
 966 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
 967                              struct rxtid *rxtid, struct sk_buff *skb)
 968 {
 969         struct sk_buff *new_skb;
 970         struct ethhdr *hdr;
 971         u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
 972         u8 *framep;
 973
 974         mac_hdr_len = sizeof(struct ethhdr);
 975         framep = skb->data + mac_hdr_len;
 976         amsdu_len = skb->len - mac_hdr_len;
 977
 978         while (amsdu_len > mac_hdr_len) {
 979                 hdr = (struct ethhdr *) framep;
 980                 payload_8023_len = ntohs(hdr->h_proto);
 981
 982                 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
 983                     payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
 984                         ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
 985                                    payload_8023_len);
 986                         break;
 987                 }
 988
 989                 frame_8023_len = payload_8023_len + mac_hdr_len;
 990                 new_skb = aggr_get_free_skb(p_aggr);
 991                 if (!new_skb) {
 992                         ath6kl_err("no buffer available\n");
 993                         break;
 994                 }
 995
 996                 memcpy(new_skb->data, framep, frame_8023_len);
 997                 skb_put(new_skb, frame_8023_len);
 998                 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
 999                         ath6kl_err("dot3_2_dix error\n");
1000                         dev_kfree_skb(new_skb);
1001                         break;
1002                 }
1003
1004                 skb_queue_tail(&rxtid->q, new_skb);
1005
1006                 /* Is this the last subframe within this aggregate ? */
1007                 if ((amsdu_len - frame_8023_len) == 0)
1008                         break;
1009
1010                 /* Add the length of A-MSDU subframe padding bytes -
1011                  * Round to nearest word.
1012                  */
1013                 frame_8023_len = ALIGN(frame_8023_len, 4);
1014
1015                 framep += frame_8023_len;
1016                 amsdu_len -= frame_8023_len;
1017         }
1018
1019         dev_kfree_skb(skb);
1020 }
1021
1022 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1023                             u16 seq_no, u8 order)
1024 {
1025         struct sk_buff *skb;
1026         struct rxtid *rxtid;
1027         struct skb_hold_q *node;
1028         u16 idx, idx_end, seq_end;
1029         struct rxtid_stats *stats;
1030
1031         rxtid = &agg_conn->rx_tid[tid];
1032         stats = &agg_conn->stat[tid];
1033
1034         idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1035
1036         /*
1037          * idx_end is typically the last possible frame in the window,
1038          * but changes to 'the' seq_no, when BAR comes. If seq_no
1039          * is non-zero, we will go up to that and stop.
1040          * Note: last seq no in current window will occupy the same
1041          * index position as index that is just previous to start.
1042          * An imp point : if win_sz is 7, for seq_no space of 4095,
1043          * then, there would be holes when sequence wrap around occurs.
1044          * Target should judiciously choose the win_sz, based on
1045          * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1046          * 2, 4, 8, 16 win_sz works fine).
1047          * We must deque from "idx" to "idx_end", including both.
1048          */
1049         seq_end = seq_no ? seq_no : rxtid->seq_next;
1050         idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1051
1052         spin_lock_bh(&rxtid->lock);
1053
1054         do {
1055                 node = &rxtid->hold_q[idx];
1056                 if ((order == 1) && (!node->skb))
1057                         break;
1058
1059                 if (node->skb) {
1060                         if (node->is_amsdu)
1061                                 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1062                                                  node->skb);
1063                         else
1064                                 skb_queue_tail(&rxtid->q, node->skb);
1065                         node->skb = NULL;
1066                 } else
1067                         stats->num_hole++;
1068
1069                 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1070                 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1071         } while (idx != idx_end);
1072
1073         spin_unlock_bh(&rxtid->lock);
1074
1075         stats->num_delivered += skb_queue_len(&rxtid->q);
1076
1077         while ((skb = skb_dequeue(&rxtid->q)))
1078                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1079 }
1080
1081 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1082                                   u16 seq_no,
1083                                   bool is_amsdu, struct sk_buff *frame)
1084 {
1085         struct rxtid *rxtid;
1086         struct rxtid_stats *stats;
1087         struct sk_buff *skb;
1088         struct skb_hold_q *node;
1089         u16 idx, st, cur, end;
1090         bool is_queued = false;
1091         u16 extended_end;
1092
1093         rxtid = &agg_conn->rx_tid[tid];
1094         stats = &agg_conn->stat[tid];
1095
1096         stats->num_into_aggr++;
1097
1098         if (!rxtid->aggr) {
1099                 if (is_amsdu) {
1100                         aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1101                         is_queued = true;
1102                         stats->num_amsdu++;
1103                         while ((skb = skb_dequeue(&rxtid->q)))
1104                                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1105                                                                   skb);
1106                 }
1107                 return is_queued;
1108         }
1109
1110         /* Check the incoming sequence no, if it's in the window */
1111         st = rxtid->seq_next;
1112         cur = seq_no;
1113         end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1114
1115         if (((st < end) && (cur < st || cur > end)) ||
1116             ((st > end) && (cur > end) && (cur < st))) {
1117                 extended_end = (end + rxtid->hold_q_sz - 1) &
1118                         ATH6KL_MAX_SEQ_NO;
1119
1120                 if (((end < extended_end) &&
1121                      (cur < end || cur > extended_end)) ||
1122                     ((end > extended_end) && (cur > extended_end) &&
1123                      (cur < end))) {
1124                         aggr_deque_frms(agg_conn, tid, 0, 0);
1125                         if (cur >= rxtid->hold_q_sz - 1)
1126                                 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1127                         else
1128                                 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1129                                                   (rxtid->hold_q_sz - 2 - cur);
1130                 } else {
1131                         /*
1132                          * Dequeue only those frames that are outside the
1133                          * new shifted window.
1134                          */
1135                         if (cur >= rxtid->hold_q_sz - 1)
1136                                 st = cur - (rxtid->hold_q_sz - 1);
1137                         else
1138                                 st = ATH6KL_MAX_SEQ_NO -
1139                                         (rxtid->hold_q_sz - 2 - cur);
1140
1141                         aggr_deque_frms(agg_conn, tid, st, 0);
1142                 }
1143
1144                 stats->num_oow++;
1145         }
1146
1147         idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1148
1149         node = &rxtid->hold_q[idx];
1150
1151         spin_lock_bh(&rxtid->lock);
1152
1153         /*
1154          * Is the cur frame duplicate or something beyond our window(hold_q
1155          * -> which is 2x, already)?
1156          *
1157          * 1. Duplicate is easy - drop incoming frame.
1158          * 2. Not falling in current sliding window.
1159          *  2a. is the frame_seq_no preceding current tid_seq_no?
1160          *      -> drop the frame. perhaps sender did not get our ACK.
1161          *         this is taken care of above.
1162          *  2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1163          *      -> Taken care of it above, by moving window forward.
1164          */
1165         dev_kfree_skb(node->skb);
1166         stats->num_dups++;
1167
1168         node->skb = frame;
1169         is_queued = true;
1170         node->is_amsdu = is_amsdu;
1171         node->seq_no = seq_no;
1172
1173         if (node->is_amsdu)
1174                 stats->num_amsdu++;
1175         else
1176                 stats->num_mpdu++;
1177
1178         spin_unlock_bh(&rxtid->lock);
1179
1180         aggr_deque_frms(agg_conn, tid, 0, 1);
1181
1182         if (agg_conn->timer_scheduled)
1183                 rxtid->progress = true;
1184         else
1185                 for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1186                         if (rxtid->hold_q[idx].skb) {
1187                                 /*
1188                                  * There is a frame in the queue and no
1189                                  * timer so start a timer to ensure that
1190                                  * the frame doesn't remain stuck
1191                                  * forever.
1192                                  */
1193                                 agg_conn->timer_scheduled = true;
1194                                 mod_timer(&agg_conn->timer,
1195                                           (jiffies +
1196                                            HZ * (AGGR_RX_TIMEOUT) / 1000));
1197                                 rxtid->progress = false;
1198                                 rxtid->timer_mon = true;
1199                                 break;
1200                         }
1201                 }
1202
1203         return is_queued;
1204 }
1205
1206 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1207                                                  struct ath6kl_sta *conn)
1208 {
1209         struct ath6kl *ar = vif->ar;
1210         bool is_apsdq_empty, is_apsdq_empty_at_start;
1211         u32 num_frames_to_deliver, flags;
1212         struct sk_buff *skb = NULL;
1213
1214         /*
1215          * If the APSD q for this STA is not empty, dequeue and
1216          * send a pkt from the head of the q. Also update the
1217          * More data bit in the WMI_DATA_HDR if there are
1218          * more pkts for this STA in the APSD q.
1219          * If there are no more pkts for this STA,
1220          * update the APSD bitmap for this STA.
1221          */
1222
1223         num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1224                                                     ATH6KL_APSD_FRAME_MASK;
1225         /*
1226          * Number of frames to send in a service period is
1227          * indicated by the station
1228          * in the QOS_INFO of the association request
1229          * If it is zero, send all frames
1230          */
1231         if (!num_frames_to_deliver)
1232                 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1233
1234         spin_lock_bh(&conn->psq_lock);
1235         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1236         spin_unlock_bh(&conn->psq_lock);
1237         is_apsdq_empty_at_start = is_apsdq_empty;
1238
1239         while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1240
1241                 spin_lock_bh(&conn->psq_lock);
1242                 skb = skb_dequeue(&conn->apsdq);
1243                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1244                 spin_unlock_bh(&conn->psq_lock);
1245
1246                 /*
1247                  * Set the STA flag to Trigger delivery,
1248                  * so that the frame will go out
1249                  */
1250                 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1251                 num_frames_to_deliver--;
1252
1253                 /* Last frame in the service period, set EOSP or queue empty */
1254                 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1255                         conn->sta_flags |= STA_PS_APSD_EOSP;
1256
1257                 ath6kl_data_tx(skb, vif->ndev);
1258                 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1259                 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1260         }
1261
1262         if (is_apsdq_empty) {
1263                 if (is_apsdq_empty_at_start)
1264                         flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1265                 else
1266                         flags = 0;
1267
1268                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1269                                               vif->fw_vif_idx,
1270                                               conn->aid, 0, flags);
1271         }
1272
1273         return;
1274 }
1275
1276 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1277 {
1278         struct ath6kl *ar = target->dev->ar;
1279         struct sk_buff *skb = packet->pkt_cntxt;
1280         struct wmi_rx_meta_v2 *meta;
1281         struct wmi_data_hdr *dhdr;
1282         int min_hdr_len;
1283         u8 meta_type, dot11_hdr = 0;
1284         int status = packet->status;
1285         enum htc_endpoint_id ept = packet->endpoint;
1286         bool is_amsdu, prev_ps, ps_state = false;
1287         bool trig_state = false;
1288         struct ath6kl_sta *conn = NULL;
1289         struct sk_buff *skb1 = NULL;
1290         struct ethhdr *datap = NULL;
1291         struct ath6kl_vif *vif;
1292         struct aggr_info_conn *aggr_conn;
1293         u16 seq_no, offset;
1294         u8 tid, if_idx;
1295
1296         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1297                    "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1298                    __func__, ar, ept, skb, packet->buf,
1299                    packet->act_len, status);
1300
1301         if (status || !(skb->data + HTC_HDR_LENGTH)) {
1302                 dev_kfree_skb(skb);
1303                 return;
1304         }
1305
1306         skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1307         skb_pull(skb, HTC_HDR_LENGTH);
1308
1309         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1310                         skb->data, skb->len);
1311
1312         if (ept == ar->ctrl_ep) {
1313                 if (test_bit(WMI_ENABLED, &ar->flag)) {
1314                         ath6kl_check_wow_status(ar);
1315                         ath6kl_wmi_control_rx(ar->wmi, skb);
1316                         return;
1317                 }
1318                 if_idx =
1319                 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1320         } else {
1321                 if_idx =
1322                 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1323         }
1324
1325         vif = ath6kl_get_vif_by_index(ar, if_idx);
1326         if (!vif) {
1327                 dev_kfree_skb(skb);
1328                 return;
1329         }
1330
1331         /*
1332          * Take lock to protect buffer counts and adaptive power throughput
1333          * state.
1334          */
1335         spin_lock_bh(&vif->if_lock);
1336
1337         vif->net_stats.rx_packets++;
1338         vif->net_stats.rx_bytes += packet->act_len;
1339
1340         spin_unlock_bh(&vif->if_lock);
1341
1342         skb->dev = vif->ndev;
1343
1344         if (!test_bit(WMI_ENABLED, &ar->flag)) {
1345                 if (EPPING_ALIGNMENT_PAD > 0)
1346                         skb_pull(skb, EPPING_ALIGNMENT_PAD);
1347                 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1348                 return;
1349         }
1350
1351         ath6kl_check_wow_status(ar);
1352
1353         min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1354                       sizeof(struct ath6kl_llc_snap_hdr);
1355
1356         dhdr = (struct wmi_data_hdr *) skb->data;
1357
1358         /*
1359          * In the case of AP mode we may receive NULL data frames
1360          * that do not have LLC hdr. They are 16 bytes in size.
1361          * Allow these frames in the AP mode.
1362          */
1363         if (vif->nw_type != AP_NETWORK &&
1364             ((packet->act_len < min_hdr_len) ||
1365              (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1366                 ath6kl_info("frame len is too short or too long\n");
1367                 vif->net_stats.rx_errors++;
1368                 vif->net_stats.rx_length_errors++;
1369                 dev_kfree_skb(skb);
1370                 return;
1371         }
1372
1373         /* Get the Power save state of the STA */
1374         if (vif->nw_type == AP_NETWORK) {
1375                 meta_type = wmi_data_hdr_get_meta(dhdr);
1376
1377                 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1378                               WMI_DATA_HDR_PS_MASK);
1379
1380                 offset = sizeof(struct wmi_data_hdr);
1381                 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1382
1383                 switch (meta_type) {
1384                 case 0:
1385                         break;
1386                 case WMI_META_VERSION_1:
1387                         offset += sizeof(struct wmi_rx_meta_v1);
1388                         break;
1389                 case WMI_META_VERSION_2:
1390                         offset += sizeof(struct wmi_rx_meta_v2);
1391                         break;
1392                 default:
1393                         break;
1394                 }
1395
1396                 datap = (struct ethhdr *) (skb->data + offset);
1397                 conn = ath6kl_find_sta(vif, datap->h_source);
1398
1399                 if (!conn) {
1400                         dev_kfree_skb(skb);
1401                         return;
1402                 }
1403
1404                 /*
1405                  * If there is a change in PS state of the STA,
1406                  * take appropriate steps:
1407                  *
1408                  * 1. If Sleep-->Awake, flush the psq for the STA
1409                  *    Clear the PVB for the STA.
1410                  * 2. If Awake-->Sleep, Starting queueing frames
1411                  *    the STA.
1412                  */
1413                 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1414
1415                 if (ps_state)
1416                         conn->sta_flags |= STA_PS_SLEEP;
1417                 else
1418                         conn->sta_flags &= ~STA_PS_SLEEP;
1419
1420                 /* Accept trigger only when the station is in sleep */
1421                 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1422                         ath6kl_uapsd_trigger_frame_rx(vif, conn);
1423
1424                 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1425                         if (!(conn->sta_flags & STA_PS_SLEEP)) {
1426                                 struct sk_buff *skbuff = NULL;
1427                                 bool is_apsdq_empty;
1428                                 struct ath6kl_mgmt_buff *mgmt;
1429                                 u8 idx;
1430
1431                                 spin_lock_bh(&conn->psq_lock);
1432                                 while (conn->mgmt_psq_len > 0) {
1433                                         mgmt = list_first_entry(
1434                                                         &conn->mgmt_psq,
1435                                                         struct ath6kl_mgmt_buff,
1436                                                         list);
1437                                         list_del(&mgmt->list);
1438                                         conn->mgmt_psq_len--;
1439                                         spin_unlock_bh(&conn->psq_lock);
1440                                         idx = vif->fw_vif_idx;
1441
1442                                         ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1443                                                                  idx,
1444                                                                  mgmt->id,
1445                                                                  mgmt->freq,
1446                                                                  mgmt->wait,
1447                                                                  mgmt->buf,
1448                                                                  mgmt->len,
1449                                                                  mgmt->no_cck);
1450
1451                                         kfree(mgmt);
1452                                         spin_lock_bh(&conn->psq_lock);
1453                                 }
1454                                 conn->mgmt_psq_len = 0;
1455                                 while ((skbuff = skb_dequeue(&conn->psq))) {
1456                                         spin_unlock_bh(&conn->psq_lock);
1457                                         ath6kl_data_tx(skbuff, vif->ndev);
1458                                         spin_lock_bh(&conn->psq_lock);
1459                                 }
1460
1461                                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1462                                 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1463                                         spin_unlock_bh(&conn->psq_lock);
1464                                         ath6kl_data_tx(skbuff, vif->ndev);
1465                                         spin_lock_bh(&conn->psq_lock);
1466                                 }
1467                                 spin_unlock_bh(&conn->psq_lock);
1468
1469                                 if (!is_apsdq_empty)
1470                                         ath6kl_wmi_set_apsd_bfrd_traf(
1471                                                         ar->wmi,
1472                                                         vif->fw_vif_idx,
1473                                                         conn->aid, 0, 0);
1474
1475                                 /* Clear the PVB for this STA */
1476                                 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1477                                                        conn->aid, 0);
1478                         }
1479                 }
1480
1481                 /* drop NULL data frames here */
1482                 if ((packet->act_len < min_hdr_len) ||
1483                     (packet->act_len >
1484                      WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1485                         dev_kfree_skb(skb);
1486                         return;
1487                 }
1488         }
1489
1490         is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1491         tid = wmi_data_hdr_get_up(dhdr);
1492         seq_no = wmi_data_hdr_get_seqno(dhdr);
1493         meta_type = wmi_data_hdr_get_meta(dhdr);
1494         dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1495         skb_pull(skb, sizeof(struct wmi_data_hdr));
1496
1497         switch (meta_type) {
1498         case WMI_META_VERSION_1:
1499                 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1500                 break;
1501         case WMI_META_VERSION_2:
1502                 meta = (struct wmi_rx_meta_v2 *) skb->data;
1503                 if (meta->csum_flags & 0x1) {
1504                         skb->ip_summed = CHECKSUM_COMPLETE;
1505                         skb->csum = (__force __wsum) meta->csum;
1506                 }
1507                 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1508                 break;
1509         default:
1510                 break;
1511         }
1512
1513         if (dot11_hdr)
1514                 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1515         else if (!is_amsdu)
1516                 status = ath6kl_wmi_dot3_2_dix(skb);
1517
1518         if (status) {
1519                 /*
1520                  * Drop frames that could not be processed (lack of
1521                  * memory, etc.)
1522                  */
1523                 dev_kfree_skb(skb);
1524                 return;
1525         }
1526
1527         if (!(vif->ndev->flags & IFF_UP)) {
1528                 dev_kfree_skb(skb);
1529                 return;
1530         }
1531
1532         if (vif->nw_type == AP_NETWORK) {
1533                 datap = (struct ethhdr *) skb->data;
1534                 if (is_multicast_ether_addr(datap->h_dest))
1535                         /*
1536                          * Bcast/Mcast frames should be sent to the
1537                          * OS stack as well as on the air.
1538                          */
1539                         skb1 = skb_copy(skb, GFP_ATOMIC);
1540                 else {
1541                         /*
1542                          * Search for a connected STA with dstMac
1543                          * as the Mac address. If found send the
1544                          * frame to it on the air else send the
1545                          * frame up the stack.
1546                          */
1547                         conn = ath6kl_find_sta(vif, datap->h_dest);
1548
1549                         if (conn && ar->intra_bss) {
1550                                 skb1 = skb;
1551                                 skb = NULL;
1552                         } else if (conn && !ar->intra_bss) {
1553                                 dev_kfree_skb(skb);
1554                                 skb = NULL;
1555                         }
1556                 }
1557                 if (skb1)
1558                         ath6kl_data_tx(skb1, vif->ndev);
1559
1560                 if (skb == NULL) {
1561                         /* nothing to deliver up the stack */
1562                         return;
1563                 }
1564         }
1565
1566         datap = (struct ethhdr *) skb->data;
1567
1568         if (is_unicast_ether_addr(datap->h_dest)) {
1569                 if (vif->nw_type == AP_NETWORK) {
1570                         conn = ath6kl_find_sta(vif, datap->h_source);
1571                         if (!conn)
1572                                 return;
1573                         aggr_conn = conn->aggr_conn;
1574                 } else
1575                         aggr_conn = vif->aggr_cntxt->aggr_conn;
1576
1577                 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1578                                           is_amsdu, skb)) {
1579                         /* aggregation code will handle the skb */
1580                         return;
1581                 }
1582         }
1583
1584         ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1585 }
1586
1587 static void aggr_timeout(unsigned long arg)
1588 {
1589         u8 i, j;
1590         struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1591         struct rxtid *rxtid;
1592         struct rxtid_stats *stats;
1593
1594         for (i = 0; i < NUM_OF_TIDS; i++) {
1595                 rxtid = &aggr_conn->rx_tid[i];
1596                 stats = &aggr_conn->stat[i];
1597
1598                 if (!rxtid->aggr || !rxtid->timer_mon || rxtid->progress)
1599                         continue;
1600
1601                 stats->num_timeouts++;
1602                 ath6kl_dbg(ATH6KL_DBG_AGGR,
1603                            "aggr timeout (st %d end %d)\n",
1604                            rxtid->seq_next,
1605                            ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1606                             ATH6KL_MAX_SEQ_NO));
1607                 aggr_deque_frms(aggr_conn, i, 0, 0);
1608         }
1609
1610         aggr_conn->timer_scheduled = false;
1611
1612         for (i = 0; i < NUM_OF_TIDS; i++) {
1613                 rxtid = &aggr_conn->rx_tid[i];
1614
1615                 if (rxtid->aggr && rxtid->hold_q) {
1616                         for (j = 0; j < rxtid->hold_q_sz; j++) {
1617                                 if (rxtid->hold_q[j].skb) {
1618                                         aggr_conn->timer_scheduled = true;
1619                                         rxtid->timer_mon = true;
1620                                         rxtid->progress = false;
1621                                         break;
1622                                 }
1623                         }
1624
1625                         if (j >= rxtid->hold_q_sz)
1626                                 rxtid->timer_mon = false;
1627                 }
1628         }
1629
1630         if (aggr_conn->timer_scheduled)
1631                 mod_timer(&aggr_conn->timer,
1632                           jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1633 }
1634
1635 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1636 {
1637         struct rxtid *rxtid;
1638         struct rxtid_stats *stats;
1639
1640         if (!aggr_conn || tid >= NUM_OF_TIDS)
1641                 return;
1642
1643         rxtid = &aggr_conn->rx_tid[tid];
1644         stats = &aggr_conn->stat[tid];
1645
1646         if (rxtid->aggr)
1647                 aggr_deque_frms(aggr_conn, tid, 0, 0);
1648
1649         rxtid->aggr = false;
1650         rxtid->progress = false;
1651         rxtid->timer_mon = false;
1652         rxtid->win_sz = 0;
1653         rxtid->seq_next = 0;
1654         rxtid->hold_q_sz = 0;
1655
1656         kfree(rxtid->hold_q);
1657         rxtid->hold_q = NULL;
1658
1659         memset(stats, 0, sizeof(struct rxtid_stats));
1660 }
1661
1662 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1663                              u8 win_sz)
1664 {
1665         struct ath6kl_sta *sta;
1666         struct aggr_info_conn *aggr_conn = NULL;
1667         struct rxtid *rxtid;
1668         struct rxtid_stats *stats;
1669         u16 hold_q_size;
1670         u8 tid, aid;
1671
1672         if (vif->nw_type == AP_NETWORK) {
1673                 aid = ath6kl_get_aid(tid_mux);
1674                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1675                 if (sta)
1676                         aggr_conn = sta->aggr_conn;
1677         } else
1678                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1679
1680         if (!aggr_conn)
1681                 return;
1682
1683         tid = ath6kl_get_tid(tid_mux);
1684         if (tid >= NUM_OF_TIDS)
1685                 return;
1686
1687         rxtid = &aggr_conn->rx_tid[tid];
1688         stats = &aggr_conn->stat[tid];
1689
1690         if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1691                 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1692                            __func__, win_sz, tid);
1693
1694         if (rxtid->aggr)
1695                 aggr_delete_tid_state(aggr_conn, tid);
1696
1697         rxtid->seq_next = seq_no;
1698         hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1699         rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1700         if (!rxtid->hold_q)
1701                 return;
1702
1703         rxtid->win_sz = win_sz;
1704         rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1705         if (!skb_queue_empty(&rxtid->q))
1706                 return;
1707
1708         rxtid->aggr = true;
1709 }
1710
1711 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1712                     struct aggr_info_conn *aggr_conn)
1713 {
1714         struct rxtid *rxtid;
1715         u8 i;
1716
1717         aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1718         aggr_conn->dev = vif->ndev;
1719         init_timer(&aggr_conn->timer);
1720         aggr_conn->timer.function = aggr_timeout;
1721         aggr_conn->timer.data = (unsigned long) aggr_conn;
1722         aggr_conn->aggr_info = aggr_info;
1723
1724         aggr_conn->timer_scheduled = false;
1725
1726         for (i = 0; i < NUM_OF_TIDS; i++) {
1727                 rxtid = &aggr_conn->rx_tid[i];
1728                 rxtid->aggr = false;
1729                 rxtid->progress = false;
1730                 rxtid->timer_mon = false;
1731                 skb_queue_head_init(&rxtid->q);
1732                 spin_lock_init(&rxtid->lock);
1733         }
1734
1735 }
1736
1737 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1738 {
1739         struct aggr_info *p_aggr = NULL;
1740
1741         p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1742         if (!p_aggr) {
1743                 ath6kl_err("failed to alloc memory for aggr_node\n");
1744                 return NULL;
1745         }
1746
1747         p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1748         if (!p_aggr->aggr_conn) {
1749                 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1750                 kfree(p_aggr);
1751                 return NULL;
1752         }
1753
1754         aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1755
1756         skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1757         ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1758
1759         return p_aggr;
1760 }
1761
1762 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1763 {
1764         struct ath6kl_sta *sta;
1765         struct rxtid *rxtid;
1766         struct aggr_info_conn *aggr_conn = NULL;
1767         u8 tid, aid;
1768
1769         if (vif->nw_type == AP_NETWORK) {
1770                 aid = ath6kl_get_aid(tid_mux);
1771                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1772                 if (sta)
1773                         aggr_conn = sta->aggr_conn;
1774         } else
1775                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1776
1777         if (!aggr_conn)
1778                 return;
1779
1780         tid = ath6kl_get_tid(tid_mux);
1781         if (tid >= NUM_OF_TIDS)
1782                 return;
1783
1784         rxtid = &aggr_conn->rx_tid[tid];
1785
1786         if (rxtid->aggr)
1787                 aggr_delete_tid_state(aggr_conn, tid);
1788 }
1789
1790 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1791 {
1792         u8 tid;
1793
1794         if (!aggr_conn)
1795                 return;
1796
1797         if (aggr_conn->timer_scheduled) {
1798                 del_timer(&aggr_conn->timer);
1799                 aggr_conn->timer_scheduled = false;
1800         }
1801
1802         for (tid = 0; tid < NUM_OF_TIDS; tid++)
1803                 aggr_delete_tid_state(aggr_conn, tid);
1804 }
1805
1806 /* clean up our amsdu buffer list */
1807 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1808 {
1809         struct htc_packet *packet, *tmp_pkt;
1810
1811         spin_lock_bh(&ar->lock);
1812         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1813                 spin_unlock_bh(&ar->lock);
1814                 return;
1815         }
1816
1817         list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1818                                  list) {
1819                 list_del(&packet->list);
1820                 spin_unlock_bh(&ar->lock);
1821                 dev_kfree_skb(packet->pkt_cntxt);
1822                 spin_lock_bh(&ar->lock);
1823         }
1824
1825         spin_unlock_bh(&ar->lock);
1826 }
1827
1828 void aggr_module_destroy(struct aggr_info *aggr_info)
1829 {
1830         if (!aggr_info)
1831                 return;
1832
1833         aggr_reset_state(aggr_info->aggr_conn);
1834         skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1835         kfree(aggr_info->aggr_conn);
1836         kfree(aggr_info);
1837 }