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(struct htc_target *target,
 670                         struct list_head *packet_queue)
 671 {
 672         struct ath6kl *ar = target->dev->ar;
 673         struct sk_buff_head skb_queue;
 674         struct htc_packet *packet;
 675         struct sk_buff *skb;
 676         struct ath6kl_cookie *ath6kl_cookie;
 677         u32 map_no = 0;
 678         int status;
 679         enum htc_endpoint_id eid;
 680         bool wake_event = false;
 681         bool flushing[ATH6KL_VIF_MAX] = {false};
 682         u8 if_idx;
 683         struct ath6kl_vif *vif;
 684
 685         skb_queue_head_init(&skb_queue);
 686
 687         /* lock the driver as we update internal state */
 688         spin_lock_bh(&ar->lock);
 689
 690         /* reap completed packets */
 691         while (!list_empty(packet_queue)) {
 692
 693                 packet = list_first_entry(packet_queue, struct htc_packet,
 694                                           list);
 695                 list_del(&packet->list);
 696
 697                 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
 698                 if (!ath6kl_cookie)
 699                         goto fatal;
 700
 701                 status = packet->status;
 702                 skb = ath6kl_cookie->skb;
 703                 eid = packet->endpoint;
 704                 map_no = ath6kl_cookie->map_no;
 705
 706                 if (!skb || !skb->data)
 707                         goto fatal;
 708
 709                 __skb_queue_tail(&skb_queue, skb);
 710
 711                 if (!status && (packet->act_len != skb->len))
 712                         goto fatal;
 713
 714                 ar->tx_pending[eid]--;
 715
 716                 if (eid != ar->ctrl_ep)
 717                         ar->total_tx_data_pend--;
 718
 719                 if (eid == ar->ctrl_ep) {
 720                         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
 721                                 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
 722
 723                         if (ar->tx_pending[eid] == 0)
 724                                 wake_event = true;
 725                 }
 726
 727                 if (eid == ar->ctrl_ep) {
 728                         if_idx = wmi_cmd_hdr_get_if_idx(
 729                                 (struct wmi_cmd_hdr *) packet->buf);
 730                 } else {
 731                         if_idx = wmi_data_hdr_get_if_idx(
 732                                 (struct wmi_data_hdr *) packet->buf);
 733                 }
 734
 735                 vif = ath6kl_get_vif_by_index(ar, if_idx);
 736                 if (!vif) {
 737                         ath6kl_free_cookie(ar, ath6kl_cookie);
 738                         continue;
 739                 }
 740
 741                 if (status) {
 742                         if (status == -ECANCELED)
 743                                 /* a packet was flushed  */
 744                                 flushing[if_idx] = true;
 745
 746                         vif->net_stats.tx_errors++;
 747
 748                         if (status != -ENOSPC && status != -ECANCELED)
 749                                 ath6kl_warn("tx complete error: %d\n", status);
 750
 751                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 752                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 753                                    __func__, skb, packet->buf, packet->act_len,
 754                                    eid, "error!");
 755                 } else {
 756                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 757                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 758                                    __func__, skb, packet->buf, packet->act_len,
 759                                    eid, "OK");
 760
 761                         flushing[if_idx] = false;
 762                         vif->net_stats.tx_packets++;
 763                         vif->net_stats.tx_bytes += skb->len;
 764                 }
 765
 766                 ath6kl_tx_clear_node_map(vif, eid, map_no);
 767
 768                 ath6kl_free_cookie(ar, ath6kl_cookie);
 769
 770                 if (test_bit(NETQ_STOPPED, &vif->flags))
 771                         clear_bit(NETQ_STOPPED, &vif->flags);
 772         }
 773
 774         spin_unlock_bh(&ar->lock);
 775
 776         __skb_queue_purge(&skb_queue);
 777
 778         /* FIXME: Locking */
 779         spin_lock_bh(&ar->list_lock);
 780         list_for_each_entry(vif, &ar->vif_list, list) {
 781                 if (test_bit(CONNECTED, &vif->flags) &&
 782                     !flushing[vif->fw_vif_idx]) {
 783                         spin_unlock_bh(&ar->list_lock);
 784                         netif_wake_queue(vif->ndev);
 785                         spin_lock_bh(&ar->list_lock);
 786                 }
 787         }
 788         spin_unlock_bh(&ar->list_lock);
 789
 790         if (wake_event)
 791                 wake_up(&ar->event_wq);
 792
 793         return;
 794
 795 fatal:
 796         WARN_ON(1);
 797         spin_unlock_bh(&ar->lock);
 798         return;
 799 }
 800
 801 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
 802 {
 803         int i;
 804
 805         /* flush all the data (non-control) streams */
 806         for (i = 0; i < WMM_NUM_AC; i++)
 807                 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
 808                                       ATH6KL_DATA_PKT_TAG);
 809 }
 810
 811 /* Rx functions */
 812
 813 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
 814                                               struct sk_buff *skb)
 815 {
 816         if (!skb)
 817                 return;
 818
 819         skb->dev = dev;
 820
 821         if (!(skb->dev->flags & IFF_UP)) {
 822                 dev_kfree_skb(skb);
 823                 return;
 824         }
 825
 826         skb->protocol = eth_type_trans(skb, skb->dev);
 827
 828         netif_rx_ni(skb);
 829 }
 830
 831 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
 832 {
 833         struct sk_buff *skb;
 834
 835         while (num) {
 836                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 837                 if (!skb) {
 838                         ath6kl_err("netbuf allocation failed\n");
 839                         return;
 840                 }
 841                 skb_queue_tail(q, skb);
 842                 num--;
 843         }
 844 }
 845
 846 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
 847 {
 848         struct sk_buff *skb = NULL;
 849
 850         if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
 851             (AGGR_NUM_OF_FREE_NETBUFS >> 2))
 852                 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
 853                                      AGGR_NUM_OF_FREE_NETBUFS);
 854
 855         skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
 856
 857         return skb;
 858 }
 859
 860 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
 861 {
 862         struct ath6kl *ar = target->dev->ar;
 863         struct sk_buff *skb;
 864         int rx_buf;
 865         int n_buf_refill;
 866         struct htc_packet *packet;
 867         struct list_head queue;
 868
 869         n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
 870                           ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
 871
 872         if (n_buf_refill <= 0)
 873                 return;
 874
 875         INIT_LIST_HEAD(&queue);
 876
 877         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
 878                    "%s: providing htc with %d buffers at eid=%d\n",
 879                    __func__, n_buf_refill, endpoint);
 880
 881         for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
 882                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 883                 if (!skb)
 884                         break;
 885
 886                 packet = (struct htc_packet *) skb->head;
 887                 if (!IS_ALIGNED((unsigned long) skb->data, 4))
 888                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 889                 set_htc_rxpkt_info(packet, skb, skb->data,
 890                                    ATH6KL_BUFFER_SIZE, endpoint);
 891                 list_add_tail(&packet->list, &queue);
 892         }
 893
 894         if (!list_empty(&queue))
 895                 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
 896 }
 897
 898 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
 899 {
 900         struct htc_packet *packet;
 901         struct sk_buff *skb;
 902
 903         while (count) {
 904                 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
 905                 if (!skb)
 906                         return;
 907
 908                 packet = (struct htc_packet *) skb->head;
 909                 if (!IS_ALIGNED((unsigned long) skb->data, 4))
 910                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 911                 set_htc_rxpkt_info(packet, skb, skb->data,
 912                                    ATH6KL_AMSDU_BUFFER_SIZE, 0);
 913                 spin_lock_bh(&ar->lock);
 914                 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
 915                 spin_unlock_bh(&ar->lock);
 916                 count--;
 917         }
 918 }
 919
 920 /*
 921  * Callback to allocate a receive buffer for a pending packet. We use a
 922  * pre-allocated list of buffers of maximum AMSDU size (4K).
 923  */
 924 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
 925                                             enum htc_endpoint_id endpoint,
 926                                             int len)
 927 {
 928         struct ath6kl *ar = target->dev->ar;
 929         struct htc_packet *packet = NULL;
 930         struct list_head *pkt_pos;
 931         int refill_cnt = 0, depth = 0;
 932
 933         ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
 934                    __func__, endpoint, len);
 935
 936         if ((len <= ATH6KL_BUFFER_SIZE) ||
 937             (len > ATH6KL_AMSDU_BUFFER_SIZE))
 938                 return NULL;
 939
 940         spin_lock_bh(&ar->lock);
 941
 942         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
 943                 spin_unlock_bh(&ar->lock);
 944                 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
 945                 goto refill_buf;
 946         }
 947
 948         packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
 949                                   struct htc_packet, list);
 950         list_del(&packet->list);
 951         list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
 952                 depth++;
 953
 954         refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
 955         spin_unlock_bh(&ar->lock);
 956
 957         /* set actual endpoint ID */
 958         packet->endpoint = endpoint;
 959
 960 refill_buf:
 961         if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
 962                 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
 963
 964         return packet;
 965 }
 966
 967 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
 968                              struct rxtid *rxtid, struct sk_buff *skb)
 969 {
 970         struct sk_buff *new_skb;
 971         struct ethhdr *hdr;
 972         u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
 973         u8 *framep;
 974
 975         mac_hdr_len = sizeof(struct ethhdr);
 976         framep = skb->data + mac_hdr_len;
 977         amsdu_len = skb->len - mac_hdr_len;
 978
 979         while (amsdu_len > mac_hdr_len) {
 980                 hdr = (struct ethhdr *) framep;
 981                 payload_8023_len = ntohs(hdr->h_proto);
 982
 983                 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
 984                     payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
 985                         ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
 986                                    payload_8023_len);
 987                         break;
 988                 }
 989
 990                 frame_8023_len = payload_8023_len + mac_hdr_len;
 991                 new_skb = aggr_get_free_skb(p_aggr);
 992                 if (!new_skb) {
 993                         ath6kl_err("no buffer available\n");
 994                         break;
 995                 }
 996
 997                 memcpy(new_skb->data, framep, frame_8023_len);
 998                 skb_put(new_skb, frame_8023_len);
 999                 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1000                         ath6kl_err("dot3_2_dix error\n");
1001                         dev_kfree_skb(new_skb);
1002                         break;
1003                 }
1004
1005                 skb_queue_tail(&rxtid->q, new_skb);
1006
1007                 /* Is this the last subframe within this aggregate ? */
1008                 if ((amsdu_len - frame_8023_len) == 0)
1009                         break;
1010
1011                 /* Add the length of A-MSDU subframe padding bytes -
1012                  * Round to nearest word.
1013                  */
1014                 frame_8023_len = ALIGN(frame_8023_len, 4);
1015
1016                 framep += frame_8023_len;
1017                 amsdu_len -= frame_8023_len;
1018         }
1019
1020         dev_kfree_skb(skb);
1021 }
1022
1023 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1024                             u16 seq_no, u8 order)
1025 {
1026         struct sk_buff *skb;
1027         struct rxtid *rxtid;
1028         struct skb_hold_q *node;
1029         u16 idx, idx_end, seq_end;
1030         struct rxtid_stats *stats;
1031
1032         rxtid = &agg_conn->rx_tid[tid];
1033         stats = &agg_conn->stat[tid];
1034
1035         idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1036
1037         /*
1038          * idx_end is typically the last possible frame in the window,
1039          * but changes to 'the' seq_no, when BAR comes. If seq_no
1040          * is non-zero, we will go up to that and stop.
1041          * Note: last seq no in current window will occupy the same
1042          * index position as index that is just previous to start.
1043          * An imp point : if win_sz is 7, for seq_no space of 4095,
1044          * then, there would be holes when sequence wrap around occurs.
1045          * Target should judiciously choose the win_sz, based on
1046          * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1047          * 2, 4, 8, 16 win_sz works fine).
1048          * We must deque from "idx" to "idx_end", including both.
1049          */
1050         seq_end = seq_no ? seq_no : rxtid->seq_next;
1051         idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1052
1053         spin_lock_bh(&rxtid->lock);
1054
1055         do {
1056                 node = &rxtid->hold_q[idx];
1057                 if ((order == 1) && (!node->skb))
1058                         break;
1059
1060                 if (node->skb) {
1061                         if (node->is_amsdu)
1062                                 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1063                                                  node->skb);
1064                         else
1065                                 skb_queue_tail(&rxtid->q, node->skb);
1066                         node->skb = NULL;
1067                 } else
1068                         stats->num_hole++;
1069
1070                 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1071                 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1072         } while (idx != idx_end);
1073
1074         spin_unlock_bh(&rxtid->lock);
1075
1076         stats->num_delivered += skb_queue_len(&rxtid->q);
1077
1078         while ((skb = skb_dequeue(&rxtid->q)))
1079                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1080 }
1081
1082 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1083                                   u16 seq_no,
1084                                   bool is_amsdu, struct sk_buff *frame)
1085 {
1086         struct rxtid *rxtid;
1087         struct rxtid_stats *stats;
1088         struct sk_buff *skb;
1089         struct skb_hold_q *node;
1090         u16 idx, st, cur, end;
1091         bool is_queued = false;
1092         u16 extended_end;
1093
1094         rxtid = &agg_conn->rx_tid[tid];
1095         stats = &agg_conn->stat[tid];
1096
1097         stats->num_into_aggr++;
1098
1099         if (!rxtid->aggr) {
1100                 if (is_amsdu) {
1101                         aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1102                         is_queued = true;
1103                         stats->num_amsdu++;
1104                         while ((skb = skb_dequeue(&rxtid->q)))
1105                                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1106                                                                   skb);
1107                 }
1108                 return is_queued;
1109         }
1110
1111         /* Check the incoming sequence no, if it's in the window */
1112         st = rxtid->seq_next;
1113         cur = seq_no;
1114         end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1115
1116         if (((st < end) && (cur < st || cur > end)) ||
1117             ((st > end) && (cur > end) && (cur < st))) {
1118                 extended_end = (end + rxtid->hold_q_sz - 1) &
1119                         ATH6KL_MAX_SEQ_NO;
1120
1121                 if (((end < extended_end) &&
1122                      (cur < end || cur > extended_end)) ||
1123                     ((end > extended_end) && (cur > extended_end) &&
1124                      (cur < end))) {
1125                         aggr_deque_frms(agg_conn, tid, 0, 0);
1126                         if (cur >= rxtid->hold_q_sz - 1)
1127                                 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1128                         else
1129                                 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1130                                                   (rxtid->hold_q_sz - 2 - cur);
1131                 } else {
1132                         /*
1133                          * Dequeue only those frames that are outside the
1134                          * new shifted window.
1135                          */
1136                         if (cur >= rxtid->hold_q_sz - 1)
1137                                 st = cur - (rxtid->hold_q_sz - 1);
1138                         else
1139                                 st = ATH6KL_MAX_SEQ_NO -
1140                                         (rxtid->hold_q_sz - 2 - cur);
1141
1142                         aggr_deque_frms(agg_conn, tid, st, 0);
1143                 }
1144
1145                 stats->num_oow++;
1146         }
1147
1148         idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1149
1150         node = &rxtid->hold_q[idx];
1151
1152         spin_lock_bh(&rxtid->lock);
1153
1154         /*
1155          * Is the cur frame duplicate or something beyond our window(hold_q
1156          * -> which is 2x, already)?
1157          *
1158          * 1. Duplicate is easy - drop incoming frame.
1159          * 2. Not falling in current sliding window.
1160          *  2a. is the frame_seq_no preceding current tid_seq_no?
1161          *      -> drop the frame. perhaps sender did not get our ACK.
1162          *         this is taken care of above.
1163          *  2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1164          *      -> Taken care of it above, by moving window forward.
1165          */
1166         dev_kfree_skb(node->skb);
1167         stats->num_dups++;
1168
1169         node->skb = frame;
1170         is_queued = true;
1171         node->is_amsdu = is_amsdu;
1172         node->seq_no = seq_no;
1173
1174         if (node->is_amsdu)
1175                 stats->num_amsdu++;
1176         else
1177                 stats->num_mpdu++;
1178
1179         spin_unlock_bh(&rxtid->lock);
1180
1181         aggr_deque_frms(agg_conn, tid, 0, 1);
1182
1183         if (agg_conn->timer_scheduled)
1184                 rxtid->progress = true;
1185         else
1186                 for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1187                         if (rxtid->hold_q[idx].skb) {
1188                                 /*
1189                                  * There is a frame in the queue and no
1190                                  * timer so start a timer to ensure that
1191                                  * the frame doesn't remain stuck
1192                                  * forever.
1193                                  */
1194                                 agg_conn->timer_scheduled = true;
1195                                 mod_timer(&agg_conn->timer,
1196                                           (jiffies +
1197                                            HZ * (AGGR_RX_TIMEOUT) / 1000));
1198                                 rxtid->progress = false;
1199                                 rxtid->timer_mon = true;
1200                                 break;
1201                         }
1202                 }
1203
1204         return is_queued;
1205 }
1206
1207 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1208                                                  struct ath6kl_sta *conn)
1209 {
1210         struct ath6kl *ar = vif->ar;
1211         bool is_apsdq_empty, is_apsdq_empty_at_start;
1212         u32 num_frames_to_deliver, flags;
1213         struct sk_buff *skb = NULL;
1214
1215         /*
1216          * If the APSD q for this STA is not empty, dequeue and
1217          * send a pkt from the head of the q. Also update the
1218          * More data bit in the WMI_DATA_HDR if there are
1219          * more pkts for this STA in the APSD q.
1220          * If there are no more pkts for this STA,
1221          * update the APSD bitmap for this STA.
1222          */
1223
1224         num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1225                                                     ATH6KL_APSD_FRAME_MASK;
1226         /*
1227          * Number of frames to send in a service period is
1228          * indicated by the station
1229          * in the QOS_INFO of the association request
1230          * If it is zero, send all frames
1231          */
1232         if (!num_frames_to_deliver)
1233                 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1234
1235         spin_lock_bh(&conn->psq_lock);
1236         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1237         spin_unlock_bh(&conn->psq_lock);
1238         is_apsdq_empty_at_start = is_apsdq_empty;
1239
1240         while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1241
1242                 spin_lock_bh(&conn->psq_lock);
1243                 skb = skb_dequeue(&conn->apsdq);
1244                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1245                 spin_unlock_bh(&conn->psq_lock);
1246
1247                 /*
1248                  * Set the STA flag to Trigger delivery,
1249                  * so that the frame will go out
1250                  */
1251                 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1252                 num_frames_to_deliver--;
1253
1254                 /* Last frame in the service period, set EOSP or queue empty */
1255                 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1256                         conn->sta_flags |= STA_PS_APSD_EOSP;
1257
1258                 ath6kl_data_tx(skb, vif->ndev);
1259                 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1260                 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1261         }
1262
1263         if (is_apsdq_empty) {
1264                 if (is_apsdq_empty_at_start)
1265                         flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1266                 else
1267                         flags = 0;
1268
1269                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1270                                               vif->fw_vif_idx,
1271                                               conn->aid, 0, flags);
1272         }
1273
1274         return;
1275 }
1276
1277 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1278 {
1279         struct ath6kl *ar = target->dev->ar;
1280         struct sk_buff *skb = packet->pkt_cntxt;
1281         struct wmi_rx_meta_v2 *meta;
1282         struct wmi_data_hdr *dhdr;
1283         int min_hdr_len;
1284         u8 meta_type, dot11_hdr = 0;
1285         int status = packet->status;
1286         enum htc_endpoint_id ept = packet->endpoint;
1287         bool is_amsdu, prev_ps, ps_state = false;
1288         bool trig_state = false;
1289         struct ath6kl_sta *conn = NULL;
1290         struct sk_buff *skb1 = NULL;
1291         struct ethhdr *datap = NULL;
1292         struct ath6kl_vif *vif;
1293         struct aggr_info_conn *aggr_conn;
1294         u16 seq_no, offset;
1295         u8 tid, if_idx;
1296
1297         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1298                    "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1299                    __func__, ar, ept, skb, packet->buf,
1300                    packet->act_len, status);
1301
1302         if (status || !(skb->data + HTC_HDR_LENGTH)) {
1303                 dev_kfree_skb(skb);
1304                 return;
1305         }
1306
1307         skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1308         skb_pull(skb, HTC_HDR_LENGTH);
1309
1310         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1311                         skb->data, skb->len);
1312
1313         if (ept == ar->ctrl_ep) {
1314                 if (test_bit(WMI_ENABLED, &ar->flag)) {
1315                         ath6kl_check_wow_status(ar);
1316                         ath6kl_wmi_control_rx(ar->wmi, skb);
1317                         return;
1318                 }
1319                 if_idx =
1320                 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1321         } else {
1322                 if_idx =
1323                 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1324         }
1325
1326         vif = ath6kl_get_vif_by_index(ar, if_idx);
1327         if (!vif) {
1328                 dev_kfree_skb(skb);
1329                 return;
1330         }
1331
1332         /*
1333          * Take lock to protect buffer counts and adaptive power throughput
1334          * state.
1335          */
1336         spin_lock_bh(&vif->if_lock);
1337
1338         vif->net_stats.rx_packets++;
1339         vif->net_stats.rx_bytes += packet->act_len;
1340
1341         spin_unlock_bh(&vif->if_lock);
1342
1343         skb->dev = vif->ndev;
1344
1345         if (!test_bit(WMI_ENABLED, &ar->flag)) {
1346                 if (EPPING_ALIGNMENT_PAD > 0)
1347                         skb_pull(skb, EPPING_ALIGNMENT_PAD);
1348                 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1349                 return;
1350         }
1351
1352         ath6kl_check_wow_status(ar);
1353
1354         min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1355                       sizeof(struct ath6kl_llc_snap_hdr);
1356
1357         dhdr = (struct wmi_data_hdr *) skb->data;
1358
1359         /*
1360          * In the case of AP mode we may receive NULL data frames
1361          * that do not have LLC hdr. They are 16 bytes in size.
1362          * Allow these frames in the AP mode.
1363          */
1364         if (vif->nw_type != AP_NETWORK &&
1365             ((packet->act_len < min_hdr_len) ||
1366              (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1367                 ath6kl_info("frame len is too short or too long\n");
1368                 vif->net_stats.rx_errors++;
1369                 vif->net_stats.rx_length_errors++;
1370                 dev_kfree_skb(skb);
1371                 return;
1372         }
1373
1374         /* Get the Power save state of the STA */
1375         if (vif->nw_type == AP_NETWORK) {
1376                 meta_type = wmi_data_hdr_get_meta(dhdr);
1377
1378                 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1379                               WMI_DATA_HDR_PS_MASK);
1380
1381                 offset = sizeof(struct wmi_data_hdr);
1382                 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1383
1384                 switch (meta_type) {
1385                 case 0:
1386                         break;
1387                 case WMI_META_VERSION_1:
1388                         offset += sizeof(struct wmi_rx_meta_v1);
1389                         break;
1390                 case WMI_META_VERSION_2:
1391                         offset += sizeof(struct wmi_rx_meta_v2);
1392                         break;
1393                 default:
1394                         break;
1395                 }
1396
1397                 datap = (struct ethhdr *) (skb->data + offset);
1398                 conn = ath6kl_find_sta(vif, datap->h_source);
1399
1400                 if (!conn) {
1401                         dev_kfree_skb(skb);
1402                         return;
1403                 }
1404
1405                 /*
1406                  * If there is a change in PS state of the STA,
1407                  * take appropriate steps:
1408                  *
1409                  * 1. If Sleep-->Awake, flush the psq for the STA
1410                  *    Clear the PVB for the STA.
1411                  * 2. If Awake-->Sleep, Starting queueing frames
1412                  *    the STA.
1413                  */
1414                 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1415
1416                 if (ps_state)
1417                         conn->sta_flags |= STA_PS_SLEEP;
1418                 else
1419                         conn->sta_flags &= ~STA_PS_SLEEP;
1420
1421                 /* Accept trigger only when the station is in sleep */
1422                 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1423                         ath6kl_uapsd_trigger_frame_rx(vif, conn);
1424
1425                 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1426                         if (!(conn->sta_flags & STA_PS_SLEEP)) {
1427                                 struct sk_buff *skbuff = NULL;
1428                                 bool is_apsdq_empty;
1429                                 struct ath6kl_mgmt_buff *mgmt;
1430                                 u8 idx;
1431
1432                                 spin_lock_bh(&conn->psq_lock);
1433                                 while (conn->mgmt_psq_len > 0) {
1434                                         mgmt = list_first_entry(
1435                                                         &conn->mgmt_psq,
1436                                                         struct ath6kl_mgmt_buff,
1437                                                         list);
1438                                         list_del(&mgmt->list);
1439                                         conn->mgmt_psq_len--;
1440                                         spin_unlock_bh(&conn->psq_lock);
1441                                         idx = vif->fw_vif_idx;
1442
1443                                         ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1444                                                                  idx,
1445                                                                  mgmt->id,
1446                                                                  mgmt->freq,
1447                                                                  mgmt->wait,
1448                                                                  mgmt->buf,
1449                                                                  mgmt->len,
1450                                                                  mgmt->no_cck);
1451
1452                                         kfree(mgmt);
1453                                         spin_lock_bh(&conn->psq_lock);
1454                                 }
1455                                 conn->mgmt_psq_len = 0;
1456                                 while ((skbuff = skb_dequeue(&conn->psq))) {
1457                                         spin_unlock_bh(&conn->psq_lock);
1458                                         ath6kl_data_tx(skbuff, vif->ndev);
1459                                         spin_lock_bh(&conn->psq_lock);
1460                                 }
1461
1462                                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1463                                 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1464                                         spin_unlock_bh(&conn->psq_lock);
1465                                         ath6kl_data_tx(skbuff, vif->ndev);
1466                                         spin_lock_bh(&conn->psq_lock);
1467                                 }
1468                                 spin_unlock_bh(&conn->psq_lock);
1469
1470                                 if (!is_apsdq_empty)
1471                                         ath6kl_wmi_set_apsd_bfrd_traf(
1472                                                         ar->wmi,
1473                                                         vif->fw_vif_idx,
1474                                                         conn->aid, 0, 0);
1475
1476                                 /* Clear the PVB for this STA */
1477                                 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1478                                                        conn->aid, 0);
1479                         }
1480                 }
1481
1482                 /* drop NULL data frames here */
1483                 if ((packet->act_len < min_hdr_len) ||
1484                     (packet->act_len >
1485                      WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1486                         dev_kfree_skb(skb);
1487                         return;
1488                 }
1489         }
1490
1491         is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1492         tid = wmi_data_hdr_get_up(dhdr);
1493         seq_no = wmi_data_hdr_get_seqno(dhdr);
1494         meta_type = wmi_data_hdr_get_meta(dhdr);
1495         dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1496         skb_pull(skb, sizeof(struct wmi_data_hdr));
1497
1498         switch (meta_type) {
1499         case WMI_META_VERSION_1:
1500                 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1501                 break;
1502         case WMI_META_VERSION_2:
1503                 meta = (struct wmi_rx_meta_v2 *) skb->data;
1504                 if (meta->csum_flags & 0x1) {
1505                         skb->ip_summed = CHECKSUM_COMPLETE;
1506                         skb->csum = (__force __wsum) meta->csum;
1507                 }
1508                 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1509                 break;
1510         default:
1511                 break;
1512         }
1513
1514         if (dot11_hdr)
1515                 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1516         else if (!is_amsdu)
1517                 status = ath6kl_wmi_dot3_2_dix(skb);
1518
1519         if (status) {
1520                 /*
1521                  * Drop frames that could not be processed (lack of
1522                  * memory, etc.)
1523                  */
1524                 dev_kfree_skb(skb);
1525                 return;
1526         }
1527
1528         if (!(vif->ndev->flags & IFF_UP)) {
1529                 dev_kfree_skb(skb);
1530                 return;
1531         }
1532
1533         if (vif->nw_type == AP_NETWORK) {
1534                 datap = (struct ethhdr *) skb->data;
1535                 if (is_multicast_ether_addr(datap->h_dest))
1536                         /*
1537                          * Bcast/Mcast frames should be sent to the
1538                          * OS stack as well as on the air.
1539                          */
1540                         skb1 = skb_copy(skb, GFP_ATOMIC);
1541                 else {
1542                         /*
1543                          * Search for a connected STA with dstMac
1544                          * as the Mac address. If found send the
1545                          * frame to it on the air else send the
1546                          * frame up the stack.
1547                          */
1548                         conn = ath6kl_find_sta(vif, datap->h_dest);
1549
1550                         if (conn && ar->intra_bss) {
1551                                 skb1 = skb;
1552                                 skb = NULL;
1553                         } else if (conn && !ar->intra_bss) {
1554                                 dev_kfree_skb(skb);
1555                                 skb = NULL;
1556                         }
1557                 }
1558                 if (skb1)
1559                         ath6kl_data_tx(skb1, vif->ndev);
1560
1561                 if (skb == NULL) {
1562                         /* nothing to deliver up the stack */
1563                         return;
1564                 }
1565         }
1566
1567         datap = (struct ethhdr *) skb->data;
1568
1569         if (is_unicast_ether_addr(datap->h_dest)) {
1570                 if (vif->nw_type == AP_NETWORK) {
1571                         conn = ath6kl_find_sta(vif, datap->h_source);
1572                         if (!conn)
1573                                 return;
1574                         aggr_conn = conn->aggr_conn;
1575                 } else
1576                         aggr_conn = vif->aggr_cntxt->aggr_conn;
1577
1578                 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1579                                           is_amsdu, skb)) {
1580                         /* aggregation code will handle the skb */
1581                         return;
1582                 }
1583         }
1584
1585         ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1586 }
1587
1588 static void aggr_timeout(unsigned long arg)
1589 {
1590         u8 i, j;
1591         struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1592         struct rxtid *rxtid;
1593         struct rxtid_stats *stats;
1594
1595         for (i = 0; i < NUM_OF_TIDS; i++) {
1596                 rxtid = &aggr_conn->rx_tid[i];
1597                 stats = &aggr_conn->stat[i];
1598
1599                 if (!rxtid->aggr || !rxtid->timer_mon || rxtid->progress)
1600                         continue;
1601
1602                 stats->num_timeouts++;
1603                 ath6kl_dbg(ATH6KL_DBG_AGGR,
1604                            "aggr timeout (st %d end %d)\n",
1605                            rxtid->seq_next,
1606                            ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1607                             ATH6KL_MAX_SEQ_NO));
1608                 aggr_deque_frms(aggr_conn, i, 0, 0);
1609         }
1610
1611         aggr_conn->timer_scheduled = false;
1612
1613         for (i = 0; i < NUM_OF_TIDS; i++) {
1614                 rxtid = &aggr_conn->rx_tid[i];
1615
1616                 if (rxtid->aggr && rxtid->hold_q) {
1617                         for (j = 0; j < rxtid->hold_q_sz; j++) {
1618                                 if (rxtid->hold_q[j].skb) {
1619                                         aggr_conn->timer_scheduled = true;
1620                                         rxtid->timer_mon = true;
1621                                         rxtid->progress = false;
1622                                         break;
1623                                 }
1624                         }
1625
1626                         if (j >= rxtid->hold_q_sz)
1627                                 rxtid->timer_mon = false;
1628                 }
1629         }
1630
1631         if (aggr_conn->timer_scheduled)
1632                 mod_timer(&aggr_conn->timer,
1633                           jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1634 }
1635
1636 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1637 {
1638         struct rxtid *rxtid;
1639         struct rxtid_stats *stats;
1640
1641         if (!aggr_conn || tid >= NUM_OF_TIDS)
1642                 return;
1643
1644         rxtid = &aggr_conn->rx_tid[tid];
1645         stats = &aggr_conn->stat[tid];
1646
1647         if (rxtid->aggr)
1648                 aggr_deque_frms(aggr_conn, tid, 0, 0);
1649
1650         rxtid->aggr = false;
1651         rxtid->progress = false;
1652         rxtid->timer_mon = false;
1653         rxtid->win_sz = 0;
1654         rxtid->seq_next = 0;
1655         rxtid->hold_q_sz = 0;
1656
1657         kfree(rxtid->hold_q);
1658         rxtid->hold_q = NULL;
1659
1660         memset(stats, 0, sizeof(struct rxtid_stats));
1661 }
1662
1663 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1664                              u8 win_sz)
1665 {
1666         struct ath6kl_sta *sta;
1667         struct aggr_info_conn *aggr_conn = NULL;
1668         struct rxtid *rxtid;
1669         struct rxtid_stats *stats;
1670         u16 hold_q_size;
1671         u8 tid, aid;
1672
1673         if (vif->nw_type == AP_NETWORK) {
1674                 aid = ath6kl_get_aid(tid_mux);
1675                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1676                 if (sta)
1677                         aggr_conn = sta->aggr_conn;
1678         } else
1679                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1680
1681         if (!aggr_conn)
1682                 return;
1683
1684         tid = ath6kl_get_tid(tid_mux);
1685         if (tid >= NUM_OF_TIDS)
1686                 return;
1687
1688         rxtid = &aggr_conn->rx_tid[tid];
1689         stats = &aggr_conn->stat[tid];
1690
1691         if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1692                 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1693                            __func__, win_sz, tid);
1694
1695         if (rxtid->aggr)
1696                 aggr_delete_tid_state(aggr_conn, tid);
1697
1698         rxtid->seq_next = seq_no;
1699         hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1700         rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1701         if (!rxtid->hold_q)
1702                 return;
1703
1704         rxtid->win_sz = win_sz;
1705         rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1706         if (!skb_queue_empty(&rxtid->q))
1707                 return;
1708
1709         rxtid->aggr = true;
1710 }
1711
1712 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1713                     struct aggr_info_conn *aggr_conn)
1714 {
1715         struct rxtid *rxtid;
1716         u8 i;
1717
1718         aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1719         aggr_conn->dev = vif->ndev;
1720         init_timer(&aggr_conn->timer);
1721         aggr_conn->timer.function = aggr_timeout;
1722         aggr_conn->timer.data = (unsigned long) aggr_conn;
1723         aggr_conn->aggr_info = aggr_info;
1724
1725         aggr_conn->timer_scheduled = false;
1726
1727         for (i = 0; i < NUM_OF_TIDS; i++) {
1728                 rxtid = &aggr_conn->rx_tid[i];
1729                 rxtid->aggr = false;
1730                 rxtid->progress = false;
1731                 rxtid->timer_mon = false;
1732                 skb_queue_head_init(&rxtid->q);
1733                 spin_lock_init(&rxtid->lock);
1734         }
1735
1736 }
1737
1738 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1739 {
1740         struct aggr_info *p_aggr = NULL;
1741
1742         p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1743         if (!p_aggr) {
1744                 ath6kl_err("failed to alloc memory for aggr_node\n");
1745                 return NULL;
1746         }
1747
1748         p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1749         if (!p_aggr->aggr_conn) {
1750                 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1751                 kfree(p_aggr);
1752                 return NULL;
1753         }
1754
1755         aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1756
1757         skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1758         ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1759
1760         return p_aggr;
1761 }
1762
1763 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1764 {
1765         struct ath6kl_sta *sta;
1766         struct rxtid *rxtid;
1767         struct aggr_info_conn *aggr_conn = NULL;
1768         u8 tid, aid;
1769
1770         if (vif->nw_type == AP_NETWORK) {
1771                 aid = ath6kl_get_aid(tid_mux);
1772                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1773                 if (sta)
1774                         aggr_conn = sta->aggr_conn;
1775         } else
1776                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1777
1778         if (!aggr_conn)
1779                 return;
1780
1781         tid = ath6kl_get_tid(tid_mux);
1782         if (tid >= NUM_OF_TIDS)
1783                 return;
1784
1785         rxtid = &aggr_conn->rx_tid[tid];
1786
1787         if (rxtid->aggr)
1788                 aggr_delete_tid_state(aggr_conn, tid);
1789 }
1790
1791 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1792 {
1793         u8 tid;
1794
1795         if (!aggr_conn)
1796                 return;
1797
1798         if (aggr_conn->timer_scheduled) {
1799                 del_timer(&aggr_conn->timer);
1800                 aggr_conn->timer_scheduled = false;
1801         }
1802
1803         for (tid = 0; tid < NUM_OF_TIDS; tid++)
1804                 aggr_delete_tid_state(aggr_conn, tid);
1805 }
1806
1807 /* clean up our amsdu buffer list */
1808 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1809 {
1810         struct htc_packet *packet, *tmp_pkt;
1811
1812         spin_lock_bh(&ar->lock);
1813         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1814                 spin_unlock_bh(&ar->lock);
1815                 return;
1816         }
1817
1818         list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1819                                  list) {
1820                 list_del(&packet->list);
1821                 spin_unlock_bh(&ar->lock);
1822                 dev_kfree_skb(packet->pkt_cntxt);
1823                 spin_lock_bh(&ar->lock);
1824         }
1825
1826         spin_unlock_bh(&ar->lock);
1827 }
1828
1829 void aggr_module_destroy(struct aggr_info *aggr_info)
1830 {
1831         if (!aggr_info)
1832                 return;
1833
1834         aggr_reset_state(aggr_info->aggr_conn);
1835         skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1836         kfree(aggr_info->aggr_conn);
1837         kfree(aggr_info);
1838 }