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         cookie->htc_pkt.skb = skb;
 326
 327         /*
 328          * This interface is asynchronous, if there is an error, cleanup
 329          * will happen in the TX completion callback.
 330          */
 331         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
 332
 333         return 0;
 334
 335 fail_ctrl_tx:
 336         dev_kfree_skb(skb);
 337         return status;
 338 }
 339
 340 int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev)
 341 {
 342         struct ath6kl *ar = ath6kl_priv(dev);
 343         struct ath6kl_cookie *cookie = NULL;
 344         enum htc_endpoint_id eid = ENDPOINT_UNUSED;
 345         struct ath6kl_vif *vif = netdev_priv(dev);
 346         u32 map_no = 0;
 347         u16 htc_tag = ATH6KL_DATA_PKT_TAG;
 348         u8 ac = 99 ; /* initialize to unmapped ac */
 349         bool chk_adhoc_ps_mapping = false;
 350         int ret;
 351         struct wmi_tx_meta_v2 meta_v2;
 352         void *meta;
 353         u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed;
 354         u8 meta_ver = 0;
 355         u32 flags = 0;
 356
 357         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 358                    "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__,
 359                    skb, skb->data, skb->len);
 360
 361         /* If target is not associated */
 362         if (!test_bit(CONNECTED, &vif->flags)) {
 363                 dev_kfree_skb(skb);
 364                 return 0;
 365         }
 366
 367         if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON)) {
 368                 dev_kfree_skb(skb);
 369                 return 0;
 370         }
 371
 372         if (!test_bit(WMI_READY, &ar->flag))
 373                 goto fail_tx;
 374
 375         /* AP mode Power saving processing */
 376         if (vif->nw_type == AP_NETWORK) {
 377                 if (ath6kl_powersave_ap(vif, skb, &flags))
 378                         return 0;
 379         }
 380
 381         if (test_bit(WMI_ENABLED, &ar->flag)) {
 382                 if ((dev->features & NETIF_F_IP_CSUM) &&
 383                     (csum == CHECKSUM_PARTIAL)) {
 384                         csum_start = skb->csum_start -
 385                                         (skb_network_header(skb) - skb->head) +
 386                                         sizeof(struct ath6kl_llc_snap_hdr);
 387                         csum_dest = skb->csum_offset + csum_start;
 388                 }
 389
 390                 if (skb_headroom(skb) < dev->needed_headroom) {
 391                         struct sk_buff *tmp_skb = skb;
 392
 393                         skb = skb_realloc_headroom(skb, dev->needed_headroom);
 394                         kfree_skb(tmp_skb);
 395                         if (skb == NULL) {
 396                                 vif->net_stats.tx_dropped++;
 397                                 return 0;
 398                         }
 399                 }
 400
 401                 if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) {
 402                         ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n");
 403                         goto fail_tx;
 404                 }
 405
 406                 if ((dev->features & NETIF_F_IP_CSUM) &&
 407                     (csum == CHECKSUM_PARTIAL)) {
 408                         meta_v2.csum_start = csum_start;
 409                         meta_v2.csum_dest = csum_dest;
 410
 411                         /* instruct target to calculate checksum */
 412                         meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD;
 413                         meta_ver = WMI_META_VERSION_2;
 414                         meta = &meta_v2;
 415                 } else {
 416                         meta_ver = 0;
 417                         meta = NULL;
 418                 }
 419
 420                 ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb,
 421                                 DATA_MSGTYPE, flags, 0,
 422                                 meta_ver,
 423                                 meta, vif->fw_vif_idx);
 424
 425                 if (ret) {
 426                         ath6kl_warn("failed to add wmi data header:%d\n"
 427                                 , ret);
 428                         goto fail_tx;
 429                 }
 430
 431                 if ((vif->nw_type == ADHOC_NETWORK) &&
 432                     ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags))
 433                         chk_adhoc_ps_mapping = true;
 434                 else {
 435                         /* get the stream mapping */
 436                         ret = ath6kl_wmi_implicit_create_pstream(ar->wmi,
 437                                     vif->fw_vif_idx, skb,
 438                                     0, test_bit(WMM_ENABLED, &vif->flags), &ac);
 439                         if (ret)
 440                                 goto fail_tx;
 441                 }
 442         } else
 443                 goto fail_tx;
 444
 445         spin_lock_bh(&ar->lock);
 446
 447         if (chk_adhoc_ps_mapping)
 448                 eid = ath6kl_ibss_map_epid(skb, dev, &map_no);
 449         else
 450                 eid = ar->ac2ep_map[ac];
 451
 452         if (eid == 0 || eid == ENDPOINT_UNUSED) {
 453                 ath6kl_err("eid %d is not mapped!\n", eid);
 454                 spin_unlock_bh(&ar->lock);
 455                 goto fail_tx;
 456         }
 457
 458         /* allocate resource for this packet */
 459         cookie = ath6kl_alloc_cookie(ar);
 460
 461         if (!cookie) {
 462                 spin_unlock_bh(&ar->lock);
 463                 goto fail_tx;
 464         }
 465
 466         /* update counts while the lock is held */
 467         ar->tx_pending[eid]++;
 468         ar->total_tx_data_pend++;
 469
 470         spin_unlock_bh(&ar->lock);
 471
 472         if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) &&
 473             skb_cloned(skb)) {
 474                 /*
 475                  * We will touch (move the buffer data to align it. Since the
 476                  * skb buffer is cloned and not only the header is changed, we
 477                  * have to copy it to allow the changes. Since we are copying
 478                  * the data here, we may as well align it by reserving suitable
 479                  * headroom to avoid the memmove in ath6kl_htc_tx_buf_align().
 480                  */
 481                 struct sk_buff *nskb;
 482
 483                 nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC);
 484                 if (nskb == NULL)
 485                         goto fail_tx;
 486                 kfree_skb(skb);
 487                 skb = nskb;
 488         }
 489
 490         cookie->skb = skb;
 491         cookie->map_no = map_no;
 492         set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len,
 493                          eid, htc_tag);
 494         cookie->htc_pkt.skb = skb;
 495
 496         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ",
 497                         skb->data, skb->len);
 498
 499         /*
 500          * HTC interface is asynchronous, if this fails, cleanup will
 501          * happen in the ath6kl_tx_complete callback.
 502          */
 503         ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt);
 504
 505         return 0;
 506
 507 fail_tx:
 508         dev_kfree_skb(skb);
 509
 510         vif->net_stats.tx_dropped++;
 511         vif->net_stats.tx_aborted_errors++;
 512
 513         return 0;
 514 }
 515
 516 /* indicate tx activity or inactivity on a WMI stream */
 517 void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active)
 518 {
 519         struct ath6kl *ar = devt;
 520         enum htc_endpoint_id eid;
 521         int i;
 522
 523         eid = ar->ac2ep_map[traffic_class];
 524
 525         if (!test_bit(WMI_ENABLED, &ar->flag))
 526                 goto notify_htc;
 527
 528         spin_lock_bh(&ar->lock);
 529
 530         ar->ac_stream_active[traffic_class] = active;
 531
 532         if (active) {
 533                 /*
 534                  * Keep track of the active stream with the highest
 535                  * priority.
 536                  */
 537                 if (ar->ac_stream_pri_map[traffic_class] >
 538                     ar->hiac_stream_active_pri)
 539                         /* set the new highest active priority */
 540                         ar->hiac_stream_active_pri =
 541                                         ar->ac_stream_pri_map[traffic_class];
 542
 543         } else {
 544                 /*
 545                  * We may have to search for the next active stream
 546                  * that is the highest priority.
 547                  */
 548                 if (ar->hiac_stream_active_pri ==
 549                         ar->ac_stream_pri_map[traffic_class]) {
 550                         /*
 551                          * The highest priority stream just went inactive
 552                          * reset and search for the "next" highest "active"
 553                          * priority stream.
 554                          */
 555                         ar->hiac_stream_active_pri = 0;
 556
 557                         for (i = 0; i < WMM_NUM_AC; i++) {
 558                                 if (ar->ac_stream_active[i] &&
 559                                     (ar->ac_stream_pri_map[i] >
 560                                      ar->hiac_stream_active_pri))
 561                                         /*
 562                                          * Set the new highest active
 563                                          * priority.
 564                                          */
 565                                         ar->hiac_stream_active_pri =
 566                                                 ar->ac_stream_pri_map[i];
 567                         }
 568                 }
 569         }
 570
 571         spin_unlock_bh(&ar->lock);
 572
 573 notify_htc:
 574         /* notify HTC, this may cause credit distribution changes */
 575         ath6kl_htc_indicate_activity_change(ar->htc_target, eid, active);
 576 }
 577
 578 enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target,
 579                                                struct htc_packet *packet)
 580 {
 581         struct ath6kl *ar = target->dev->ar;
 582         struct ath6kl_vif *vif;
 583         enum htc_endpoint_id endpoint = packet->endpoint;
 584         enum htc_send_full_action action = HTC_SEND_FULL_KEEP;
 585
 586         if (endpoint == ar->ctrl_ep) {
 587                 /*
 588                  * Under normal WMI if this is getting full, then something
 589                  * is running rampant the host should not be exhausting the
 590                  * WMI queue with too many commands the only exception to
 591                  * this is during testing using endpointping.
 592                  */
 593                 set_bit(WMI_CTRL_EP_FULL, &ar->flag);
 594                 ath6kl_err("wmi ctrl ep is full\n");
 595                 return action;
 596         }
 597
 598         if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG)
 599                 return action;
 600
 601         /*
 602          * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for
 603          * the highest active stream.
 604          */
 605         if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] <
 606             ar->hiac_stream_active_pri &&
 607             ar->cookie_count <=
 608                         target->endpoint[endpoint].tx_drop_packet_threshold)
 609                 /*
 610                  * Give preference to the highest priority stream by
 611                  * dropping the packets which overflowed.
 612                  */
 613                 action = HTC_SEND_FULL_DROP;
 614
 615         /* FIXME: Locking */
 616         spin_lock_bh(&ar->list_lock);
 617         list_for_each_entry(vif, &ar->vif_list, list) {
 618                 if (vif->nw_type == ADHOC_NETWORK ||
 619                     action != HTC_SEND_FULL_DROP) {
 620                         spin_unlock_bh(&ar->list_lock);
 621
 622                         set_bit(NETQ_STOPPED, &vif->flags);
 623                         netif_stop_queue(vif->ndev);
 624
 625                         return action;
 626                 }
 627         }
 628         spin_unlock_bh(&ar->list_lock);
 629
 630         return action;
 631 }
 632
 633 /* TODO this needs to be looked at */
 634 static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif,
 635                                      enum htc_endpoint_id eid, u32 map_no)
 636 {
 637         struct ath6kl *ar = vif->ar;
 638         u32 i;
 639
 640         if (vif->nw_type != ADHOC_NETWORK)
 641                 return;
 642
 643         if (!ar->ibss_ps_enable)
 644                 return;
 645
 646         if (eid == ar->ctrl_ep)
 647                 return;
 648
 649         if (map_no == 0)
 650                 return;
 651
 652         map_no--;
 653         ar->node_map[map_no].tx_pend--;
 654
 655         if (ar->node_map[map_no].tx_pend)
 656                 return;
 657
 658         if (map_no != (ar->node_num - 1))
 659                 return;
 660
 661         for (i = ar->node_num; i > 0; i--) {
 662                 if (ar->node_map[i - 1].tx_pend)
 663                         break;
 664
 665                 memset(&ar->node_map[i - 1], 0,
 666                        sizeof(struct ath6kl_node_mapping));
 667                 ar->node_num--;
 668         }
 669 }
 670
 671 void ath6kl_tx_complete(struct htc_target *target,
 672                         struct list_head *packet_queue)
 673 {
 674         struct ath6kl *ar = target->dev->ar;
 675         struct sk_buff_head skb_queue;
 676         struct htc_packet *packet;
 677         struct sk_buff *skb;
 678         struct ath6kl_cookie *ath6kl_cookie;
 679         u32 map_no = 0;
 680         int status;
 681         enum htc_endpoint_id eid;
 682         bool wake_event = false;
 683         bool flushing[ATH6KL_VIF_MAX] = {false};
 684         u8 if_idx;
 685         struct ath6kl_vif *vif;
 686
 687         skb_queue_head_init(&skb_queue);
 688
 689         /* lock the driver as we update internal state */
 690         spin_lock_bh(&ar->lock);
 691
 692         /* reap completed packets */
 693         while (!list_empty(packet_queue)) {
 694
 695                 packet = list_first_entry(packet_queue, struct htc_packet,
 696                                           list);
 697                 list_del(&packet->list);
 698
 699                 ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt;
 700                 if (!ath6kl_cookie)
 701                         goto fatal;
 702
 703                 status = packet->status;
 704                 skb = ath6kl_cookie->skb;
 705                 eid = packet->endpoint;
 706                 map_no = ath6kl_cookie->map_no;
 707
 708                 if (!skb || !skb->data)
 709                         goto fatal;
 710
 711                 __skb_queue_tail(&skb_queue, skb);
 712
 713                 if (!status && (packet->act_len != skb->len))
 714                         goto fatal;
 715
 716                 ar->tx_pending[eid]--;
 717
 718                 if (eid != ar->ctrl_ep)
 719                         ar->total_tx_data_pend--;
 720
 721                 if (eid == ar->ctrl_ep) {
 722                         if (test_bit(WMI_CTRL_EP_FULL, &ar->flag))
 723                                 clear_bit(WMI_CTRL_EP_FULL, &ar->flag);
 724
 725                         if (ar->tx_pending[eid] == 0)
 726                                 wake_event = true;
 727                 }
 728
 729                 if (eid == ar->ctrl_ep) {
 730                         if_idx = wmi_cmd_hdr_get_if_idx(
 731                                 (struct wmi_cmd_hdr *) packet->buf);
 732                 } else {
 733                         if_idx = wmi_data_hdr_get_if_idx(
 734                                 (struct wmi_data_hdr *) packet->buf);
 735                 }
 736
 737                 vif = ath6kl_get_vif_by_index(ar, if_idx);
 738                 if (!vif) {
 739                         ath6kl_free_cookie(ar, ath6kl_cookie);
 740                         continue;
 741                 }
 742
 743                 if (status) {
 744                         if (status == -ECANCELED)
 745                                 /* a packet was flushed  */
 746                                 flushing[if_idx] = true;
 747
 748                         vif->net_stats.tx_errors++;
 749
 750                         if (status != -ENOSPC && status != -ECANCELED)
 751                                 ath6kl_warn("tx complete error: %d\n", status);
 752
 753                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 754                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 755                                    __func__, skb, packet->buf, packet->act_len,
 756                                    eid, "error!");
 757                 } else {
 758                         ath6kl_dbg(ATH6KL_DBG_WLAN_TX,
 759                                    "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n",
 760                                    __func__, skb, packet->buf, packet->act_len,
 761                                    eid, "OK");
 762
 763                         flushing[if_idx] = false;
 764                         vif->net_stats.tx_packets++;
 765                         vif->net_stats.tx_bytes += skb->len;
 766                 }
 767
 768                 ath6kl_tx_clear_node_map(vif, eid, map_no);
 769
 770                 ath6kl_free_cookie(ar, ath6kl_cookie);
 771
 772                 if (test_bit(NETQ_STOPPED, &vif->flags))
 773                         clear_bit(NETQ_STOPPED, &vif->flags);
 774         }
 775
 776         spin_unlock_bh(&ar->lock);
 777
 778         __skb_queue_purge(&skb_queue);
 779
 780         /* FIXME: Locking */
 781         spin_lock_bh(&ar->list_lock);
 782         list_for_each_entry(vif, &ar->vif_list, list) {
 783                 if (test_bit(CONNECTED, &vif->flags) &&
 784                     !flushing[vif->fw_vif_idx]) {
 785                         spin_unlock_bh(&ar->list_lock);
 786                         netif_wake_queue(vif->ndev);
 787                         spin_lock_bh(&ar->list_lock);
 788                 }
 789         }
 790         spin_unlock_bh(&ar->list_lock);
 791
 792         if (wake_event)
 793                 wake_up(&ar->event_wq);
 794
 795         return;
 796
 797 fatal:
 798         WARN_ON(1);
 799         spin_unlock_bh(&ar->lock);
 800         return;
 801 }
 802
 803 void ath6kl_tx_data_cleanup(struct ath6kl *ar)
 804 {
 805         int i;
 806
 807         /* flush all the data (non-control) streams */
 808         for (i = 0; i < WMM_NUM_AC; i++)
 809                 ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i],
 810                                       ATH6KL_DATA_PKT_TAG);
 811 }
 812
 813 /* Rx functions */
 814
 815 static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev,
 816                                               struct sk_buff *skb)
 817 {
 818         if (!skb)
 819                 return;
 820
 821         skb->dev = dev;
 822
 823         if (!(skb->dev->flags & IFF_UP)) {
 824                 dev_kfree_skb(skb);
 825                 return;
 826         }
 827
 828         skb->protocol = eth_type_trans(skb, skb->dev);
 829
 830         netif_rx_ni(skb);
 831 }
 832
 833 static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num)
 834 {
 835         struct sk_buff *skb;
 836
 837         while (num) {
 838                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 839                 if (!skb) {
 840                         ath6kl_err("netbuf allocation failed\n");
 841                         return;
 842                 }
 843                 skb_queue_tail(q, skb);
 844                 num--;
 845         }
 846 }
 847
 848 static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr)
 849 {
 850         struct sk_buff *skb = NULL;
 851
 852         if (skb_queue_len(&p_aggr->rx_amsdu_freeq) <
 853             (AGGR_NUM_OF_FREE_NETBUFS >> 2))
 854                 ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq,
 855                                      AGGR_NUM_OF_FREE_NETBUFS);
 856
 857         skb = skb_dequeue(&p_aggr->rx_amsdu_freeq);
 858
 859         return skb;
 860 }
 861
 862 void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint)
 863 {
 864         struct ath6kl *ar = target->dev->ar;
 865         struct sk_buff *skb;
 866         int rx_buf;
 867         int n_buf_refill;
 868         struct htc_packet *packet;
 869         struct list_head queue;
 870
 871         n_buf_refill = ATH6KL_MAX_RX_BUFFERS -
 872                           ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint);
 873
 874         if (n_buf_refill <= 0)
 875                 return;
 876
 877         INIT_LIST_HEAD(&queue);
 878
 879         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
 880                    "%s: providing htc with %d buffers at eid=%d\n",
 881                    __func__, n_buf_refill, endpoint);
 882
 883         for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) {
 884                 skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE);
 885                 if (!skb)
 886                         break;
 887
 888                 packet = (struct htc_packet *) skb->head;
 889                 if (!IS_ALIGNED((unsigned long) skb->data, 4))
 890                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 891                 set_htc_rxpkt_info(packet, skb, skb->data,
 892                                    ATH6KL_BUFFER_SIZE, endpoint);
 893                 packet->skb = skb;
 894                 list_add_tail(&packet->list, &queue);
 895         }
 896
 897         if (!list_empty(&queue))
 898                 ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue);
 899 }
 900
 901 void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count)
 902 {
 903         struct htc_packet *packet;
 904         struct sk_buff *skb;
 905
 906         while (count) {
 907                 skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE);
 908                 if (!skb)
 909                         return;
 910
 911                 packet = (struct htc_packet *) skb->head;
 912                 if (!IS_ALIGNED((unsigned long) skb->data, 4))
 913                         skb->data = PTR_ALIGN(skb->data - 4, 4);
 914                 set_htc_rxpkt_info(packet, skb, skb->data,
 915                                    ATH6KL_AMSDU_BUFFER_SIZE, 0);
 916                 packet->skb = skb;
 917
 918                 spin_lock_bh(&ar->lock);
 919                 list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue);
 920                 spin_unlock_bh(&ar->lock);
 921                 count--;
 922         }
 923 }
 924
 925 /*
 926  * Callback to allocate a receive buffer for a pending packet. We use a
 927  * pre-allocated list of buffers of maximum AMSDU size (4K).
 928  */
 929 struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target,
 930                                             enum htc_endpoint_id endpoint,
 931                                             int len)
 932 {
 933         struct ath6kl *ar = target->dev->ar;
 934         struct htc_packet *packet = NULL;
 935         struct list_head *pkt_pos;
 936         int refill_cnt = 0, depth = 0;
 937
 938         ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n",
 939                    __func__, endpoint, len);
 940
 941         if ((len <= ATH6KL_BUFFER_SIZE) ||
 942             (len > ATH6KL_AMSDU_BUFFER_SIZE))
 943                 return NULL;
 944
 945         spin_lock_bh(&ar->lock);
 946
 947         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
 948                 spin_unlock_bh(&ar->lock);
 949                 refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS;
 950                 goto refill_buf;
 951         }
 952
 953         packet = list_first_entry(&ar->amsdu_rx_buffer_queue,
 954                                   struct htc_packet, list);
 955         list_del(&packet->list);
 956         list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue)
 957                 depth++;
 958
 959         refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth;
 960         spin_unlock_bh(&ar->lock);
 961
 962         /* set actual endpoint ID */
 963         packet->endpoint = endpoint;
 964
 965 refill_buf:
 966         if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD)
 967                 ath6kl_refill_amsdu_rxbufs(ar, refill_cnt);
 968
 969         return packet;
 970 }
 971
 972 static void aggr_slice_amsdu(struct aggr_info *p_aggr,
 973                              struct rxtid *rxtid, struct sk_buff *skb)
 974 {
 975         struct sk_buff *new_skb;
 976         struct ethhdr *hdr;
 977         u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len;
 978         u8 *framep;
 979
 980         mac_hdr_len = sizeof(struct ethhdr);
 981         framep = skb->data + mac_hdr_len;
 982         amsdu_len = skb->len - mac_hdr_len;
 983
 984         while (amsdu_len > mac_hdr_len) {
 985                 hdr = (struct ethhdr *) framep;
 986                 payload_8023_len = ntohs(hdr->h_proto);
 987
 988                 if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN ||
 989                     payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) {
 990                         ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n",
 991                                    payload_8023_len);
 992                         break;
 993                 }
 994
 995                 frame_8023_len = payload_8023_len + mac_hdr_len;
 996                 new_skb = aggr_get_free_skb(p_aggr);
 997                 if (!new_skb) {
 998                         ath6kl_err("no buffer available\n");
 999                         break;
1000                 }
1001
1002                 memcpy(new_skb->data, framep, frame_8023_len);
1003                 skb_put(new_skb, frame_8023_len);
1004                 if (ath6kl_wmi_dot3_2_dix(new_skb)) {
1005                         ath6kl_err("dot3_2_dix error\n");
1006                         dev_kfree_skb(new_skb);
1007                         break;
1008                 }
1009
1010                 skb_queue_tail(&rxtid->q, new_skb);
1011
1012                 /* Is this the last subframe within this aggregate ? */
1013                 if ((amsdu_len - frame_8023_len) == 0)
1014                         break;
1015
1016                 /* Add the length of A-MSDU subframe padding bytes -
1017                  * Round to nearest word.
1018                  */
1019                 frame_8023_len = ALIGN(frame_8023_len, 4);
1020
1021                 framep += frame_8023_len;
1022                 amsdu_len -= frame_8023_len;
1023         }
1024
1025         dev_kfree_skb(skb);
1026 }
1027
1028 static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid,
1029                             u16 seq_no, u8 order)
1030 {
1031         struct sk_buff *skb;
1032         struct rxtid *rxtid;
1033         struct skb_hold_q *node;
1034         u16 idx, idx_end, seq_end;
1035         struct rxtid_stats *stats;
1036
1037         rxtid = &agg_conn->rx_tid[tid];
1038         stats = &agg_conn->stat[tid];
1039
1040         idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1041
1042         /*
1043          * idx_end is typically the last possible frame in the window,
1044          * but changes to 'the' seq_no, when BAR comes. If seq_no
1045          * is non-zero, we will go up to that and stop.
1046          * Note: last seq no in current window will occupy the same
1047          * index position as index that is just previous to start.
1048          * An imp point : if win_sz is 7, for seq_no space of 4095,
1049          * then, there would be holes when sequence wrap around occurs.
1050          * Target should judiciously choose the win_sz, based on
1051          * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz
1052          * 2, 4, 8, 16 win_sz works fine).
1053          * We must deque from "idx" to "idx_end", including both.
1054          */
1055         seq_end = seq_no ? seq_no : rxtid->seq_next;
1056         idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz);
1057
1058         spin_lock_bh(&rxtid->lock);
1059
1060         do {
1061                 node = &rxtid->hold_q[idx];
1062                 if ((order == 1) && (!node->skb))
1063                         break;
1064
1065                 if (node->skb) {
1066                         if (node->is_amsdu)
1067                                 aggr_slice_amsdu(agg_conn->aggr_info, rxtid,
1068                                                  node->skb);
1069                         else
1070                                 skb_queue_tail(&rxtid->q, node->skb);
1071                         node->skb = NULL;
1072                 } else
1073                         stats->num_hole++;
1074
1075                 rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next);
1076                 idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz);
1077         } while (idx != idx_end);
1078
1079         spin_unlock_bh(&rxtid->lock);
1080
1081         stats->num_delivered += skb_queue_len(&rxtid->q);
1082
1083         while ((skb = skb_dequeue(&rxtid->q)))
1084                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb);
1085 }
1086
1087 static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid,
1088                                   u16 seq_no,
1089                                   bool is_amsdu, struct sk_buff *frame)
1090 {
1091         struct rxtid *rxtid;
1092         struct rxtid_stats *stats;
1093         struct sk_buff *skb;
1094         struct skb_hold_q *node;
1095         u16 idx, st, cur, end;
1096         bool is_queued = false;
1097         u16 extended_end;
1098
1099         rxtid = &agg_conn->rx_tid[tid];
1100         stats = &agg_conn->stat[tid];
1101
1102         stats->num_into_aggr++;
1103
1104         if (!rxtid->aggr) {
1105                 if (is_amsdu) {
1106                         aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame);
1107                         is_queued = true;
1108                         stats->num_amsdu++;
1109                         while ((skb = skb_dequeue(&rxtid->q)))
1110                                 ath6kl_deliver_frames_to_nw_stack(agg_conn->dev,
1111                                                                   skb);
1112                 }
1113                 return is_queued;
1114         }
1115
1116         /* Check the incoming sequence no, if it's in the window */
1117         st = rxtid->seq_next;
1118         cur = seq_no;
1119         end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO;
1120
1121         if (((st < end) && (cur < st || cur > end)) ||
1122             ((st > end) && (cur > end) && (cur < st))) {
1123                 extended_end = (end + rxtid->hold_q_sz - 1) &
1124                         ATH6KL_MAX_SEQ_NO;
1125
1126                 if (((end < extended_end) &&
1127                      (cur < end || cur > extended_end)) ||
1128                     ((end > extended_end) && (cur > extended_end) &&
1129                      (cur < end))) {
1130                         aggr_deque_frms(agg_conn, tid, 0, 0);
1131                         if (cur >= rxtid->hold_q_sz - 1)
1132                                 rxtid->seq_next = cur - (rxtid->hold_q_sz - 1);
1133                         else
1134                                 rxtid->seq_next = ATH6KL_MAX_SEQ_NO -
1135                                                   (rxtid->hold_q_sz - 2 - cur);
1136                 } else {
1137                         /*
1138                          * Dequeue only those frames that are outside the
1139                          * new shifted window.
1140                          */
1141                         if (cur >= rxtid->hold_q_sz - 1)
1142                                 st = cur - (rxtid->hold_q_sz - 1);
1143                         else
1144                                 st = ATH6KL_MAX_SEQ_NO -
1145                                         (rxtid->hold_q_sz - 2 - cur);
1146
1147                         aggr_deque_frms(agg_conn, tid, st, 0);
1148                 }
1149
1150                 stats->num_oow++;
1151         }
1152
1153         idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz);
1154
1155         node = &rxtid->hold_q[idx];
1156
1157         spin_lock_bh(&rxtid->lock);
1158
1159         /*
1160          * Is the cur frame duplicate or something beyond our window(hold_q
1161          * -> which is 2x, already)?
1162          *
1163          * 1. Duplicate is easy - drop incoming frame.
1164          * 2. Not falling in current sliding window.
1165          *  2a. is the frame_seq_no preceding current tid_seq_no?
1166          *      -> drop the frame. perhaps sender did not get our ACK.
1167          *         this is taken care of above.
1168          *  2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ);
1169          *      -> Taken care of it above, by moving window forward.
1170          */
1171         dev_kfree_skb(node->skb);
1172         stats->num_dups++;
1173
1174         node->skb = frame;
1175         is_queued = true;
1176         node->is_amsdu = is_amsdu;
1177         node->seq_no = seq_no;
1178
1179         if (node->is_amsdu)
1180                 stats->num_amsdu++;
1181         else
1182                 stats->num_mpdu++;
1183
1184         spin_unlock_bh(&rxtid->lock);
1185
1186         aggr_deque_frms(agg_conn, tid, 0, 1);
1187
1188         if (agg_conn->timer_scheduled)
1189                 rxtid->progress = true;
1190         else
1191                 for (idx = 0 ; idx < rxtid->hold_q_sz; idx++) {
1192                         if (rxtid->hold_q[idx].skb) {
1193                                 /*
1194                                  * There is a frame in the queue and no
1195                                  * timer so start a timer to ensure that
1196                                  * the frame doesn't remain stuck
1197                                  * forever.
1198                                  */
1199                                 agg_conn->timer_scheduled = true;
1200                                 mod_timer(&agg_conn->timer,
1201                                           (jiffies +
1202                                            HZ * (AGGR_RX_TIMEOUT) / 1000));
1203                                 rxtid->progress = false;
1204                                 rxtid->timer_mon = true;
1205                                 break;
1206                         }
1207                 }
1208
1209         return is_queued;
1210 }
1211
1212 static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif,
1213                                                  struct ath6kl_sta *conn)
1214 {
1215         struct ath6kl *ar = vif->ar;
1216         bool is_apsdq_empty, is_apsdq_empty_at_start;
1217         u32 num_frames_to_deliver, flags;
1218         struct sk_buff *skb = NULL;
1219
1220         /*
1221          * If the APSD q for this STA is not empty, dequeue and
1222          * send a pkt from the head of the q. Also update the
1223          * More data bit in the WMI_DATA_HDR if there are
1224          * more pkts for this STA in the APSD q.
1225          * If there are no more pkts for this STA,
1226          * update the APSD bitmap for this STA.
1227          */
1228
1229         num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) &
1230                                                     ATH6KL_APSD_FRAME_MASK;
1231         /*
1232          * Number of frames to send in a service period is
1233          * indicated by the station
1234          * in the QOS_INFO of the association request
1235          * If it is zero, send all frames
1236          */
1237         if (!num_frames_to_deliver)
1238                 num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME;
1239
1240         spin_lock_bh(&conn->psq_lock);
1241         is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1242         spin_unlock_bh(&conn->psq_lock);
1243         is_apsdq_empty_at_start = is_apsdq_empty;
1244
1245         while ((!is_apsdq_empty) && (num_frames_to_deliver)) {
1246
1247                 spin_lock_bh(&conn->psq_lock);
1248                 skb = skb_dequeue(&conn->apsdq);
1249                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1250                 spin_unlock_bh(&conn->psq_lock);
1251
1252                 /*
1253                  * Set the STA flag to Trigger delivery,
1254                  * so that the frame will go out
1255                  */
1256                 conn->sta_flags |= STA_PS_APSD_TRIGGER;
1257                 num_frames_to_deliver--;
1258
1259                 /* Last frame in the service period, set EOSP or queue empty */
1260                 if ((is_apsdq_empty) || (!num_frames_to_deliver))
1261                         conn->sta_flags |= STA_PS_APSD_EOSP;
1262
1263                 ath6kl_data_tx(skb, vif->ndev);
1264                 conn->sta_flags &= ~(STA_PS_APSD_TRIGGER);
1265                 conn->sta_flags &= ~(STA_PS_APSD_EOSP);
1266         }
1267
1268         if (is_apsdq_empty) {
1269                 if (is_apsdq_empty_at_start)
1270                         flags = WMI_AP_APSD_NO_DELIVERY_FRAMES;
1271                 else
1272                         flags = 0;
1273
1274                 ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi,
1275                                               vif->fw_vif_idx,
1276                                               conn->aid, 0, flags);
1277         }
1278
1279         return;
1280 }
1281
1282 void ath6kl_rx(struct htc_target *target, struct htc_packet *packet)
1283 {
1284         struct ath6kl *ar = target->dev->ar;
1285         struct sk_buff *skb = packet->pkt_cntxt;
1286         struct wmi_rx_meta_v2 *meta;
1287         struct wmi_data_hdr *dhdr;
1288         int min_hdr_len;
1289         u8 meta_type, dot11_hdr = 0;
1290         int status = packet->status;
1291         enum htc_endpoint_id ept = packet->endpoint;
1292         bool is_amsdu, prev_ps, ps_state = false;
1293         bool trig_state = false;
1294         struct ath6kl_sta *conn = NULL;
1295         struct sk_buff *skb1 = NULL;
1296         struct ethhdr *datap = NULL;
1297         struct ath6kl_vif *vif;
1298         struct aggr_info_conn *aggr_conn;
1299         u16 seq_no, offset;
1300         u8 tid, if_idx;
1301
1302         ath6kl_dbg(ATH6KL_DBG_WLAN_RX,
1303                    "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d",
1304                    __func__, ar, ept, skb, packet->buf,
1305                    packet->act_len, status);
1306
1307         if (status || !(skb->data + HTC_HDR_LENGTH)) {
1308                 dev_kfree_skb(skb);
1309                 return;
1310         }
1311
1312         skb_put(skb, packet->act_len + HTC_HDR_LENGTH);
1313         skb_pull(skb, HTC_HDR_LENGTH);
1314
1315         ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ",
1316                         skb->data, skb->len);
1317
1318         if (ept == ar->ctrl_ep) {
1319                 if (test_bit(WMI_ENABLED, &ar->flag)) {
1320                         ath6kl_check_wow_status(ar);
1321                         ath6kl_wmi_control_rx(ar->wmi, skb);
1322                         return;
1323                 }
1324                 if_idx =
1325                 wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data);
1326         } else {
1327                 if_idx =
1328                 wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data);
1329         }
1330
1331         vif = ath6kl_get_vif_by_index(ar, if_idx);
1332         if (!vif) {
1333                 dev_kfree_skb(skb);
1334                 return;
1335         }
1336
1337         /*
1338          * Take lock to protect buffer counts and adaptive power throughput
1339          * state.
1340          */
1341         spin_lock_bh(&vif->if_lock);
1342
1343         vif->net_stats.rx_packets++;
1344         vif->net_stats.rx_bytes += packet->act_len;
1345
1346         spin_unlock_bh(&vif->if_lock);
1347
1348         skb->dev = vif->ndev;
1349
1350         if (!test_bit(WMI_ENABLED, &ar->flag)) {
1351                 if (EPPING_ALIGNMENT_PAD > 0)
1352                         skb_pull(skb, EPPING_ALIGNMENT_PAD);
1353                 ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1354                 return;
1355         }
1356
1357         ath6kl_check_wow_status(ar);
1358
1359         min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) +
1360                       sizeof(struct ath6kl_llc_snap_hdr);
1361
1362         dhdr = (struct wmi_data_hdr *) skb->data;
1363
1364         /*
1365          * In the case of AP mode we may receive NULL data frames
1366          * that do not have LLC hdr. They are 16 bytes in size.
1367          * Allow these frames in the AP mode.
1368          */
1369         if (vif->nw_type != AP_NETWORK &&
1370             ((packet->act_len < min_hdr_len) ||
1371              (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) {
1372                 ath6kl_info("frame len is too short or too long\n");
1373                 vif->net_stats.rx_errors++;
1374                 vif->net_stats.rx_length_errors++;
1375                 dev_kfree_skb(skb);
1376                 return;
1377         }
1378
1379         /* Get the Power save state of the STA */
1380         if (vif->nw_type == AP_NETWORK) {
1381                 meta_type = wmi_data_hdr_get_meta(dhdr);
1382
1383                 ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) &
1384                               WMI_DATA_HDR_PS_MASK);
1385
1386                 offset = sizeof(struct wmi_data_hdr);
1387                 trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG);
1388
1389                 switch (meta_type) {
1390                 case 0:
1391                         break;
1392                 case WMI_META_VERSION_1:
1393                         offset += sizeof(struct wmi_rx_meta_v1);
1394                         break;
1395                 case WMI_META_VERSION_2:
1396                         offset += sizeof(struct wmi_rx_meta_v2);
1397                         break;
1398                 default:
1399                         break;
1400                 }
1401
1402                 datap = (struct ethhdr *) (skb->data + offset);
1403                 conn = ath6kl_find_sta(vif, datap->h_source);
1404
1405                 if (!conn) {
1406                         dev_kfree_skb(skb);
1407                         return;
1408                 }
1409
1410                 /*
1411                  * If there is a change in PS state of the STA,
1412                  * take appropriate steps:
1413                  *
1414                  * 1. If Sleep-->Awake, flush the psq for the STA
1415                  *    Clear the PVB for the STA.
1416                  * 2. If Awake-->Sleep, Starting queueing frames
1417                  *    the STA.
1418                  */
1419                 prev_ps = !!(conn->sta_flags & STA_PS_SLEEP);
1420
1421                 if (ps_state)
1422                         conn->sta_flags |= STA_PS_SLEEP;
1423                 else
1424                         conn->sta_flags &= ~STA_PS_SLEEP;
1425
1426                 /* Accept trigger only when the station is in sleep */
1427                 if ((conn->sta_flags & STA_PS_SLEEP) && trig_state)
1428                         ath6kl_uapsd_trigger_frame_rx(vif, conn);
1429
1430                 if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) {
1431                         if (!(conn->sta_flags & STA_PS_SLEEP)) {
1432                                 struct sk_buff *skbuff = NULL;
1433                                 bool is_apsdq_empty;
1434                                 struct ath6kl_mgmt_buff *mgmt;
1435                                 u8 idx;
1436
1437                                 spin_lock_bh(&conn->psq_lock);
1438                                 while (conn->mgmt_psq_len > 0) {
1439                                         mgmt = list_first_entry(
1440                                                         &conn->mgmt_psq,
1441                                                         struct ath6kl_mgmt_buff,
1442                                                         list);
1443                                         list_del(&mgmt->list);
1444                                         conn->mgmt_psq_len--;
1445                                         spin_unlock_bh(&conn->psq_lock);
1446                                         idx = vif->fw_vif_idx;
1447
1448                                         ath6kl_wmi_send_mgmt_cmd(ar->wmi,
1449                                                                  idx,
1450                                                                  mgmt->id,
1451                                                                  mgmt->freq,
1452                                                                  mgmt->wait,
1453                                                                  mgmt->buf,
1454                                                                  mgmt->len,
1455                                                                  mgmt->no_cck);
1456
1457                                         kfree(mgmt);
1458                                         spin_lock_bh(&conn->psq_lock);
1459                                 }
1460                                 conn->mgmt_psq_len = 0;
1461                                 while ((skbuff = skb_dequeue(&conn->psq))) {
1462                                         spin_unlock_bh(&conn->psq_lock);
1463                                         ath6kl_data_tx(skbuff, vif->ndev);
1464                                         spin_lock_bh(&conn->psq_lock);
1465                                 }
1466
1467                                 is_apsdq_empty = skb_queue_empty(&conn->apsdq);
1468                                 while ((skbuff = skb_dequeue(&conn->apsdq))) {
1469                                         spin_unlock_bh(&conn->psq_lock);
1470                                         ath6kl_data_tx(skbuff, vif->ndev);
1471                                         spin_lock_bh(&conn->psq_lock);
1472                                 }
1473                                 spin_unlock_bh(&conn->psq_lock);
1474
1475                                 if (!is_apsdq_empty)
1476                                         ath6kl_wmi_set_apsd_bfrd_traf(
1477                                                         ar->wmi,
1478                                                         vif->fw_vif_idx,
1479                                                         conn->aid, 0, 0);
1480
1481                                 /* Clear the PVB for this STA */
1482                                 ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
1483                                                        conn->aid, 0);
1484                         }
1485                 }
1486
1487                 /* drop NULL data frames here */
1488                 if ((packet->act_len < min_hdr_len) ||
1489                     (packet->act_len >
1490                      WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) {
1491                         dev_kfree_skb(skb);
1492                         return;
1493                 }
1494         }
1495
1496         is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false;
1497         tid = wmi_data_hdr_get_up(dhdr);
1498         seq_no = wmi_data_hdr_get_seqno(dhdr);
1499         meta_type = wmi_data_hdr_get_meta(dhdr);
1500         dot11_hdr = wmi_data_hdr_get_dot11(dhdr);
1501         skb_pull(skb, sizeof(struct wmi_data_hdr));
1502
1503         switch (meta_type) {
1504         case WMI_META_VERSION_1:
1505                 skb_pull(skb, sizeof(struct wmi_rx_meta_v1));
1506                 break;
1507         case WMI_META_VERSION_2:
1508                 meta = (struct wmi_rx_meta_v2 *) skb->data;
1509                 if (meta->csum_flags & 0x1) {
1510                         skb->ip_summed = CHECKSUM_COMPLETE;
1511                         skb->csum = (__force __wsum) meta->csum;
1512                 }
1513                 skb_pull(skb, sizeof(struct wmi_rx_meta_v2));
1514                 break;
1515         default:
1516                 break;
1517         }
1518
1519         if (dot11_hdr)
1520                 status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb);
1521         else if (!is_amsdu)
1522                 status = ath6kl_wmi_dot3_2_dix(skb);
1523
1524         if (status) {
1525                 /*
1526                  * Drop frames that could not be processed (lack of
1527                  * memory, etc.)
1528                  */
1529                 dev_kfree_skb(skb);
1530                 return;
1531         }
1532
1533         if (!(vif->ndev->flags & IFF_UP)) {
1534                 dev_kfree_skb(skb);
1535                 return;
1536         }
1537
1538         if (vif->nw_type == AP_NETWORK) {
1539                 datap = (struct ethhdr *) skb->data;
1540                 if (is_multicast_ether_addr(datap->h_dest))
1541                         /*
1542                          * Bcast/Mcast frames should be sent to the
1543                          * OS stack as well as on the air.
1544                          */
1545                         skb1 = skb_copy(skb, GFP_ATOMIC);
1546                 else {
1547                         /*
1548                          * Search for a connected STA with dstMac
1549                          * as the Mac address. If found send the
1550                          * frame to it on the air else send the
1551                          * frame up the stack.
1552                          */
1553                         conn = ath6kl_find_sta(vif, datap->h_dest);
1554
1555                         if (conn && ar->intra_bss) {
1556                                 skb1 = skb;
1557                                 skb = NULL;
1558                         } else if (conn && !ar->intra_bss) {
1559                                 dev_kfree_skb(skb);
1560                                 skb = NULL;
1561                         }
1562                 }
1563                 if (skb1)
1564                         ath6kl_data_tx(skb1, vif->ndev);
1565
1566                 if (skb == NULL) {
1567                         /* nothing to deliver up the stack */
1568                         return;
1569                 }
1570         }
1571
1572         datap = (struct ethhdr *) skb->data;
1573
1574         if (is_unicast_ether_addr(datap->h_dest)) {
1575                 if (vif->nw_type == AP_NETWORK) {
1576                         conn = ath6kl_find_sta(vif, datap->h_source);
1577                         if (!conn)
1578                                 return;
1579                         aggr_conn = conn->aggr_conn;
1580                 } else
1581                         aggr_conn = vif->aggr_cntxt->aggr_conn;
1582
1583                 if (aggr_process_recv_frm(aggr_conn, tid, seq_no,
1584                                           is_amsdu, skb)) {
1585                         /* aggregation code will handle the skb */
1586                         return;
1587                 }
1588         }
1589
1590         ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb);
1591 }
1592
1593 static void aggr_timeout(unsigned long arg)
1594 {
1595         u8 i, j;
1596         struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg;
1597         struct rxtid *rxtid;
1598         struct rxtid_stats *stats;
1599
1600         for (i = 0; i < NUM_OF_TIDS; i++) {
1601                 rxtid = &aggr_conn->rx_tid[i];
1602                 stats = &aggr_conn->stat[i];
1603
1604                 if (!rxtid->aggr || !rxtid->timer_mon || rxtid->progress)
1605                         continue;
1606
1607                 stats->num_timeouts++;
1608                 ath6kl_dbg(ATH6KL_DBG_AGGR,
1609                            "aggr timeout (st %d end %d)\n",
1610                            rxtid->seq_next,
1611                            ((rxtid->seq_next + rxtid->hold_q_sz-1) &
1612                             ATH6KL_MAX_SEQ_NO));
1613                 aggr_deque_frms(aggr_conn, i, 0, 0);
1614         }
1615
1616         aggr_conn->timer_scheduled = false;
1617
1618         for (i = 0; i < NUM_OF_TIDS; i++) {
1619                 rxtid = &aggr_conn->rx_tid[i];
1620
1621                 if (rxtid->aggr && rxtid->hold_q) {
1622                         for (j = 0; j < rxtid->hold_q_sz; j++) {
1623                                 if (rxtid->hold_q[j].skb) {
1624                                         aggr_conn->timer_scheduled = true;
1625                                         rxtid->timer_mon = true;
1626                                         rxtid->progress = false;
1627                                         break;
1628                                 }
1629                         }
1630
1631                         if (j >= rxtid->hold_q_sz)
1632                                 rxtid->timer_mon = false;
1633                 }
1634         }
1635
1636         if (aggr_conn->timer_scheduled)
1637                 mod_timer(&aggr_conn->timer,
1638                           jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT));
1639 }
1640
1641 static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid)
1642 {
1643         struct rxtid *rxtid;
1644         struct rxtid_stats *stats;
1645
1646         if (!aggr_conn || tid >= NUM_OF_TIDS)
1647                 return;
1648
1649         rxtid = &aggr_conn->rx_tid[tid];
1650         stats = &aggr_conn->stat[tid];
1651
1652         if (rxtid->aggr)
1653                 aggr_deque_frms(aggr_conn, tid, 0, 0);
1654
1655         rxtid->aggr = false;
1656         rxtid->progress = false;
1657         rxtid->timer_mon = false;
1658         rxtid->win_sz = 0;
1659         rxtid->seq_next = 0;
1660         rxtid->hold_q_sz = 0;
1661
1662         kfree(rxtid->hold_q);
1663         rxtid->hold_q = NULL;
1664
1665         memset(stats, 0, sizeof(struct rxtid_stats));
1666 }
1667
1668 void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no,
1669                              u8 win_sz)
1670 {
1671         struct ath6kl_sta *sta;
1672         struct aggr_info_conn *aggr_conn = NULL;
1673         struct rxtid *rxtid;
1674         struct rxtid_stats *stats;
1675         u16 hold_q_size;
1676         u8 tid, aid;
1677
1678         if (vif->nw_type == AP_NETWORK) {
1679                 aid = ath6kl_get_aid(tid_mux);
1680                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1681                 if (sta)
1682                         aggr_conn = sta->aggr_conn;
1683         } else
1684                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1685
1686         if (!aggr_conn)
1687                 return;
1688
1689         tid = ath6kl_get_tid(tid_mux);
1690         if (tid >= NUM_OF_TIDS)
1691                 return;
1692
1693         rxtid = &aggr_conn->rx_tid[tid];
1694         stats = &aggr_conn->stat[tid];
1695
1696         if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX)
1697                 ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n",
1698                            __func__, win_sz, tid);
1699
1700         if (rxtid->aggr)
1701                 aggr_delete_tid_state(aggr_conn, tid);
1702
1703         rxtid->seq_next = seq_no;
1704         hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q);
1705         rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL);
1706         if (!rxtid->hold_q)
1707                 return;
1708
1709         rxtid->win_sz = win_sz;
1710         rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz);
1711         if (!skb_queue_empty(&rxtid->q))
1712                 return;
1713
1714         rxtid->aggr = true;
1715 }
1716
1717 void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info,
1718                     struct aggr_info_conn *aggr_conn)
1719 {
1720         struct rxtid *rxtid;
1721         u8 i;
1722
1723         aggr_conn->aggr_sz = AGGR_SZ_DEFAULT;
1724         aggr_conn->dev = vif->ndev;
1725         init_timer(&aggr_conn->timer);
1726         aggr_conn->timer.function = aggr_timeout;
1727         aggr_conn->timer.data = (unsigned long) aggr_conn;
1728         aggr_conn->aggr_info = aggr_info;
1729
1730         aggr_conn->timer_scheduled = false;
1731
1732         for (i = 0; i < NUM_OF_TIDS; i++) {
1733                 rxtid = &aggr_conn->rx_tid[i];
1734                 rxtid->aggr = false;
1735                 rxtid->progress = false;
1736                 rxtid->timer_mon = false;
1737                 skb_queue_head_init(&rxtid->q);
1738                 spin_lock_init(&rxtid->lock);
1739         }
1740
1741 }
1742
1743 struct aggr_info *aggr_init(struct ath6kl_vif *vif)
1744 {
1745         struct aggr_info *p_aggr = NULL;
1746
1747         p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL);
1748         if (!p_aggr) {
1749                 ath6kl_err("failed to alloc memory for aggr_node\n");
1750                 return NULL;
1751         }
1752
1753         p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL);
1754         if (!p_aggr->aggr_conn) {
1755                 ath6kl_err("failed to alloc memory for connection specific aggr info\n");
1756                 kfree(p_aggr);
1757                 return NULL;
1758         }
1759
1760         aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn);
1761
1762         skb_queue_head_init(&p_aggr->rx_amsdu_freeq);
1763         ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS);
1764
1765         return p_aggr;
1766 }
1767
1768 void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux)
1769 {
1770         struct ath6kl_sta *sta;
1771         struct rxtid *rxtid;
1772         struct aggr_info_conn *aggr_conn = NULL;
1773         u8 tid, aid;
1774
1775         if (vif->nw_type == AP_NETWORK) {
1776                 aid = ath6kl_get_aid(tid_mux);
1777                 sta = ath6kl_find_sta_by_aid(vif->ar, aid);
1778                 if (sta)
1779                         aggr_conn = sta->aggr_conn;
1780         } else
1781                 aggr_conn = vif->aggr_cntxt->aggr_conn;
1782
1783         if (!aggr_conn)
1784                 return;
1785
1786         tid = ath6kl_get_tid(tid_mux);
1787         if (tid >= NUM_OF_TIDS)
1788                 return;
1789
1790         rxtid = &aggr_conn->rx_tid[tid];
1791
1792         if (rxtid->aggr)
1793                 aggr_delete_tid_state(aggr_conn, tid);
1794 }
1795
1796 void aggr_reset_state(struct aggr_info_conn *aggr_conn)
1797 {
1798         u8 tid;
1799
1800         if (!aggr_conn)
1801                 return;
1802
1803         if (aggr_conn->timer_scheduled) {
1804                 del_timer(&aggr_conn->timer);
1805                 aggr_conn->timer_scheduled = false;
1806         }
1807
1808         for (tid = 0; tid < NUM_OF_TIDS; tid++)
1809                 aggr_delete_tid_state(aggr_conn, tid);
1810 }
1811
1812 /* clean up our amsdu buffer list */
1813 void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar)
1814 {
1815         struct htc_packet *packet, *tmp_pkt;
1816
1817         spin_lock_bh(&ar->lock);
1818         if (list_empty(&ar->amsdu_rx_buffer_queue)) {
1819                 spin_unlock_bh(&ar->lock);
1820                 return;
1821         }
1822
1823         list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue,
1824                                  list) {
1825                 list_del(&packet->list);
1826                 spin_unlock_bh(&ar->lock);
1827                 dev_kfree_skb(packet->pkt_cntxt);
1828                 spin_lock_bh(&ar->lock);
1829         }
1830
1831         spin_unlock_bh(&ar->lock);
1832 }
1833
1834 void aggr_module_destroy(struct aggr_info *aggr_info)
1835 {
1836         if (!aggr_info)
1837                 return;
1838
1839         aggr_reset_state(aggr_info->aggr_conn);
1840         skb_queue_purge(&aggr_info->rx_amsdu_freeq);
1841         kfree(aggr_info->aggr_conn);
1842         kfree(aggr_info);
1843 }