Pileus Git - ~andy/linux/blob - drivers/net/wireless/ti/wlcore/tx.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/etherdevice.h>
  27
  28 #include "wlcore.h"
  29 #include "debug.h"
  30 #include "io.h"
  31 #include "ps.h"
  32 #include "tx.h"
  33 #include "event.h"
  34 #include "hw_ops.h"
  35
  36 /*
  37  * TODO: this is here just for now, it must be removed when the data
  38  * operations are in place.
  39  */
  40 #include "../wl12xx/reg.h"
  41
  42 static int wl1271_set_default_wep_key(struct wl1271 *wl,
  43                                       struct wl12xx_vif *wlvif, u8 id)
  44 {
  45         int ret;
  46         bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
  47
  48         if (is_ap)
  49                 ret = wl12xx_cmd_set_default_wep_key(wl, id,
  50                                                      wlvif->ap.bcast_hlid);
  51         else
  52                 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
  53
  54         if (ret < 0)
  55                 return ret;
  56
  57         wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
  58         return 0;
  59 }
  60
  61 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
  62 {
  63         int id;
  64
  65         id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
  66         if (id >= wl->num_tx_desc)
  67                 return -EBUSY;
  68
  69         __set_bit(id, wl->tx_frames_map);
  70         wl->tx_frames[id] = skb;
  71         wl->tx_frames_cnt++;
  72         return id;
  73 }
  74
  75 void wl1271_free_tx_id(struct wl1271 *wl, int id)
  76 {
  77         if (__test_and_clear_bit(id, wl->tx_frames_map)) {
  78                 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
  79                         clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
  80
  81                 wl->tx_frames[id] = NULL;
  82                 wl->tx_frames_cnt--;
  83         }
  84 }
  85 EXPORT_SYMBOL(wl1271_free_tx_id);
  86
  87 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
  88                                                  struct sk_buff *skb)
  89 {
  90         struct ieee80211_hdr *hdr;
  91
  92         /*
  93          * add the station to the known list before transmitting the
  94          * authentication response. this way it won't get de-authed by FW
  95          * when transmitting too soon.
  96          */
  97         hdr = (struct ieee80211_hdr *)(skb->data +
  98                                        sizeof(struct wl1271_tx_hw_descr));
  99         if (ieee80211_is_auth(hdr->frame_control))
 100                 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
 101 }
 102
 103 static void wl1271_tx_regulate_link(struct wl1271 *wl,
 104                                     struct wl12xx_vif *wlvif,
 105                                     u8 hlid)
 106 {
 107         bool fw_ps, single_sta;
 108         u8 tx_pkts;
 109
 110         if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
 111                 return;
 112
 113         fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
 114         tx_pkts = wl->links[hlid].allocated_pkts;
 115         single_sta = (wl->active_sta_count == 1);
 116
 117         /*
 118          * if in FW PS and there is enough data in FW we can put the link
 119          * into high-level PS and clean out its TX queues.
 120          * Make an exception if this is the only connected station. In this
 121          * case FW-memory congestion is not a problem.
 122          */
 123         if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
 124                 wl12xx_ps_link_start(wl, wlvif, hlid, true);
 125 }
 126
 127 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
 128 {
 129         return wl->dummy_packet == skb;
 130 }
 131 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
 132
 133 u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 134                          struct sk_buff *skb)
 135 {
 136         struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
 137
 138         if (control->control.sta) {
 139                 struct wl1271_station *wl_sta;
 140
 141                 wl_sta = (struct wl1271_station *)
 142                                 control->control.sta->drv_priv;
 143                 return wl_sta->hlid;
 144         } else {
 145                 struct ieee80211_hdr *hdr;
 146
 147                 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
 148                         return wl->system_hlid;
 149
 150                 hdr = (struct ieee80211_hdr *)skb->data;
 151                 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
 152                         return wlvif->ap.bcast_hlid;
 153                 else
 154                         return wlvif->ap.global_hlid;
 155         }
 156 }
 157
 158 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 159                       struct sk_buff *skb)
 160 {
 161         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 162
 163         if (!wlvif || wl12xx_is_dummy_packet(wl, skb))
 164                 return wl->system_hlid;
 165
 166         if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 167                 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb);
 168
 169         if ((test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags) ||
 170              test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags)) &&
 171             !ieee80211_is_auth(hdr->frame_control) &&
 172             !ieee80211_is_assoc_req(hdr->frame_control))
 173                 return wlvif->sta.hlid;
 174         else
 175                 return wlvif->dev_hlid;
 176 }
 177
 178 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
 179                                           unsigned int packet_length)
 180 {
 181         if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
 182             !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
 183                 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
 184         else
 185                 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
 186 }
 187 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
 188
 189 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 190                               struct sk_buff *skb, u32 extra, u32 buf_offset,
 191                               u8 hlid, bool is_gem)
 192 {
 193         struct wl1271_tx_hw_descr *desc;
 194         u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
 195         u32 total_blocks;
 196         int id, ret = -EBUSY, ac;
 197         u32 spare_blocks;
 198
 199         if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
 200                 return -EAGAIN;
 201
 202         spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
 203
 204         /* allocate free identifier for the packet */
 205         id = wl1271_alloc_tx_id(wl, skb);
 206         if (id < 0)
 207                 return id;
 208
 209         total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
 210
 211         if (total_blocks <= wl->tx_blocks_available) {
 212                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 213                         skb, total_len - skb->len);
 214
 215                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 216                                              spare_blocks);
 217
 218                 desc->id = id;
 219
 220                 wl->tx_blocks_available -= total_blocks;
 221                 wl->tx_allocated_blocks += total_blocks;
 222
 223                 /* If the FW was empty before, arm the Tx watchdog */
 224                 if (wl->tx_allocated_blocks == total_blocks)
 225                         wl12xx_rearm_tx_watchdog_locked(wl);
 226
 227                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 228                 wl->tx_allocated_pkts[ac]++;
 229
 230                 if (!wl12xx_is_dummy_packet(wl, skb) && wlvif &&
 231                     wlvif->bss_type == BSS_TYPE_AP_BSS &&
 232                     test_bit(hlid, wlvif->ap.sta_hlid_map))
 233                         wl->links[hlid].allocated_pkts++;
 234
 235                 ret = 0;
 236
 237                 wl1271_debug(DEBUG_TX,
 238                              "tx_allocate: size: %d, blocks: %d, id: %d",
 239                              total_len, total_blocks, id);
 240         } else {
 241                 wl1271_free_tx_id(wl, id);
 242         }
 243
 244         return ret;
 245 }
 246
 247 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 248                                struct sk_buff *skb, u32 extra,
 249                                struct ieee80211_tx_info *control, u8 hlid)
 250 {
 251         struct timespec ts;
 252         struct wl1271_tx_hw_descr *desc;
 253         int ac, rate_idx;
 254         s64 hosttime;
 255         u16 tx_attr = 0;
 256         __le16 frame_control;
 257         struct ieee80211_hdr *hdr;
 258         u8 *frame_start;
 259         bool is_dummy;
 260
 261         desc = (struct wl1271_tx_hw_descr *) skb->data;
 262         frame_start = (u8 *)(desc + 1);
 263         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 264         frame_control = hdr->frame_control;
 265
 266         /* relocate space for security header */
 267         if (extra) {
 268                 int hdrlen = ieee80211_hdrlen(frame_control);
 269                 memmove(frame_start, hdr, hdrlen);
 270                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 271         }
 272
 273         /* configure packet life time */
 274         getnstimeofday(&ts);
 275         hosttime = (timespec_to_ns(&ts) >> 10);
 276         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 277
 278         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 279         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 280                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 281         else
 282                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 283
 284         /* queue */
 285         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 286         desc->tid = skb->priority;
 287
 288         if (is_dummy) {
 289                 /*
 290                  * FW expects the dummy packet to have an invalid session id -
 291                  * any session id that is different than the one set in the join
 292                  */
 293                 tx_attr = (SESSION_COUNTER_INVALID <<
 294                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 295                            TX_HW_ATTR_SESSION_COUNTER;
 296
 297                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 298         } else if (wlvif) {
 299                 /* configure the tx attributes */
 300                 tx_attr = wlvif->session_counter <<
 301                           TX_HW_ATTR_OFST_SESSION_COUNTER;
 302         }
 303
 304         desc->hlid = hlid;
 305         if (is_dummy || !wlvif)
 306                 rate_idx = 0;
 307         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 308                 /*
 309                  * if the packets are destined for AP (have a STA entry)
 310                  * send them with AP rate policies (EAPOLs are an exception),
 311                  * otherwise use default basic rates
 312                  */
 313                 if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 314                         rate_idx = wlvif->sta.p2p_rate_idx;
 315                 else if (skb->protocol == cpu_to_be16(ETH_P_PAE))
 316                         rate_idx = wlvif->sta.basic_rate_idx;
 317                 else if (control->control.sta)
 318                         rate_idx = wlvif->sta.ap_rate_idx;
 319                 else
 320                         rate_idx = wlvif->sta.basic_rate_idx;
 321         } else {
 322                 if (hlid == wlvif->ap.global_hlid)
 323                         rate_idx = wlvif->ap.mgmt_rate_idx;
 324                 else if (hlid == wlvif->ap.bcast_hlid)
 325                         rate_idx = wlvif->ap.bcast_rate_idx;
 326                 else
 327                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 328         }
 329
 330         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 331
 332         /* for WEP shared auth - no fw encryption is needed */
 333         if (ieee80211_is_auth(frame_control) &&
 334             ieee80211_has_protected(frame_control))
 335                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 336
 337         desc->tx_attr = cpu_to_le16(tx_attr);
 338
 339         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 340         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 341 }
 342
 343 /* caller must hold wl->mutex */
 344 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 345                                    struct sk_buff *skb, u32 buf_offset)
 346 {
 347         struct ieee80211_tx_info *info;
 348         u32 extra = 0;
 349         int ret = 0;
 350         u32 total_len;
 351         u8 hlid;
 352         bool is_dummy;
 353         bool is_gem = false;
 354
 355         if (!skb)
 356                 return -EINVAL;
 357
 358         info = IEEE80211_SKB_CB(skb);
 359
 360         /* TODO: handle dummy packets on multi-vifs */
 361         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 362
 363         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 364             info->control.hw_key &&
 365             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 366                 extra = WL1271_EXTRA_SPACE_TKIP;
 367
 368         if (info->control.hw_key) {
 369                 bool is_wep;
 370                 u8 idx = info->control.hw_key->hw_key_idx;
 371                 u32 cipher = info->control.hw_key->cipher;
 372
 373                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 374                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 375
 376                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 377                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 378                         if (ret < 0)
 379                                 return ret;
 380                         wlvif->default_key = idx;
 381                 }
 382
 383                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 384         }
 385         hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 386         if (hlid == WL12XX_INVALID_LINK_ID) {
 387                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 388                 return -EINVAL;
 389         }
 390
 391         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
 392                                  is_gem);
 393         if (ret < 0)
 394                 return ret;
 395
 396         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 397
 398         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 399                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 400                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 401         }
 402
 403         /*
 404          * The length of each packet is stored in terms of
 405          * words. Thus, we must pad the skb data to make sure its
 406          * length is aligned.  The number of padding bytes is computed
 407          * and set in wl1271_tx_fill_hdr.
 408          * In special cases, we want to align to a specific block size
 409          * (eg. for wl128x with SDIO we align to 256).
 410          */
 411         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 412
 413         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 414         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 415
 416         /* Revert side effects in the dummy packet skb, so it can be reused */
 417         if (is_dummy)
 418                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 419
 420         return total_len;
 421 }
 422
 423 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 424                                 enum ieee80211_band rate_band)
 425 {
 426         struct ieee80211_supported_band *band;
 427         u32 enabled_rates = 0;
 428         int bit;
 429
 430         band = wl->hw->wiphy->bands[rate_band];
 431         for (bit = 0; bit < band->n_bitrates; bit++) {
 432                 if (rate_set & 0x1)
 433                         enabled_rates |= band->bitrates[bit].hw_value;
 434                 rate_set >>= 1;
 435         }
 436
 437         /* MCS rates indication are on bits 16 - 31 */
 438         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 439
 440         for (bit = 0; bit < 16; bit++) {
 441                 if (rate_set & 0x1)
 442                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 443                 rate_set >>= 1;
 444         }
 445
 446         return enabled_rates;
 447 }
 448
 449 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 450 {
 451         int i;
 452
 453         for (i = 0; i < NUM_TX_QUEUES; i++) {
 454                 if (wlcore_is_queue_stopped_by_reason(wl, i,
 455                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 456                     wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 457                         /* firmware buffer has space, restart queues */
 458                         wlcore_wake_queue(wl, i,
 459                                           WLCORE_QUEUE_STOP_REASON_WATERMARK);
 460                 }
 461         }
 462 }
 463
 464 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
 465                                                 struct sk_buff_head *queues)
 466 {
 467         int i, q = -1, ac;
 468         u32 min_pkts = 0xffffffff;
 469
 470         /*
 471          * Find a non-empty ac where:
 472          * 1. There are packets to transmit
 473          * 2. The FW has the least allocated blocks
 474          *
 475          * We prioritize the ACs according to VO>VI>BE>BK
 476          */
 477         for (i = 0; i < NUM_TX_QUEUES; i++) {
 478                 ac = wl1271_tx_get_queue(i);
 479                 if (!skb_queue_empty(&queues[ac]) &&
 480                     (wl->tx_allocated_pkts[ac] < min_pkts)) {
 481                         q = ac;
 482                         min_pkts = wl->tx_allocated_pkts[q];
 483                 }
 484         }
 485
 486         if (q == -1)
 487                 return NULL;
 488
 489         return &queues[q];
 490 }
 491
 492 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
 493                                               struct wl1271_link *lnk)
 494 {
 495         struct sk_buff *skb;
 496         unsigned long flags;
 497         struct sk_buff_head *queue;
 498
 499         queue = wl1271_select_queue(wl, lnk->tx_queue);
 500         if (!queue)
 501                 return NULL;
 502
 503         skb = skb_dequeue(queue);
 504         if (skb) {
 505                 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 506                 spin_lock_irqsave(&wl->wl_lock, flags);
 507                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 508                 wl->tx_queue_count[q]--;
 509                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 510         }
 511
 512         return skb;
 513 }
 514
 515 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
 516                                               struct wl12xx_vif *wlvif)
 517 {
 518         struct sk_buff *skb = NULL;
 519         int i, h, start_hlid;
 520
 521         /* start from the link after the last one */
 522         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 523
 524         /* dequeue according to AC, round robin on each link */
 525         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 526                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 527
 528                 /* only consider connected stations */
 529                 if (!test_bit(h, wlvif->links_map))
 530                         continue;
 531
 532                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
 533                 if (!skb)
 534                         continue;
 535
 536                 wlvif->last_tx_hlid = h;
 537                 break;
 538         }
 539
 540         if (!skb)
 541                 wlvif->last_tx_hlid = 0;
 542
 543         return skb;
 544 }
 545
 546 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 547 {
 548         unsigned long flags;
 549         struct wl12xx_vif *wlvif = wl->last_wlvif;
 550         struct sk_buff *skb = NULL;
 551
 552         /* continue from last wlvif (round robin) */
 553         if (wlvif) {
 554                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 555                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 556                         if (skb) {
 557                                 wl->last_wlvif = wlvif;
 558                                 break;
 559                         }
 560                 }
 561         }
 562
 563         /* dequeue from the system HLID before the restarting wlvif list */
 564         if (!skb)
 565                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
 566
 567         /* do a new pass over the wlvif list */
 568         if (!skb) {
 569                 wl12xx_for_each_wlvif(wl, wlvif) {
 570                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 571                         if (skb) {
 572                                 wl->last_wlvif = wlvif;
 573                                 break;
 574                         }
 575
 576                         /*
 577                          * No need to continue after last_wlvif. The previous
 578                          * pass should have found it.
 579                          */
 580                         if (wlvif == wl->last_wlvif)
 581                                 break;
 582                 }
 583         }
 584
 585         if (!skb &&
 586             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 587                 int q;
 588
 589                 skb = wl->dummy_packet;
 590                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 591                 spin_lock_irqsave(&wl->wl_lock, flags);
 592                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 593                 wl->tx_queue_count[q]--;
 594                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 595         }
 596
 597         return skb;
 598 }
 599
 600 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 601                                   struct sk_buff *skb)
 602 {
 603         unsigned long flags;
 604         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 605
 606         if (wl12xx_is_dummy_packet(wl, skb)) {
 607                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 608         } else {
 609                 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 610                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 611
 612                 /* make sure we dequeue the same packet next time */
 613                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 614                                       WL12XX_MAX_LINKS;
 615         }
 616
 617         spin_lock_irqsave(&wl->wl_lock, flags);
 618         wl->tx_queue_count[q]++;
 619         spin_unlock_irqrestore(&wl->wl_lock, flags);
 620 }
 621
 622 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 623 {
 624         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 625
 626         return ieee80211_is_data_present(hdr->frame_control);
 627 }
 628
 629 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 630 {
 631         struct wl12xx_vif *wlvif;
 632         u32 timeout;
 633         u8 hlid;
 634
 635         if (!wl->conf.rx_streaming.interval)
 636                 return;
 637
 638         if (!wl->conf.rx_streaming.always &&
 639             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 640                 return;
 641
 642         timeout = wl->conf.rx_streaming.duration;
 643         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 644                 bool found = false;
 645                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 646                         if (test_bit(hlid, wlvif->links_map)) {
 647                                 found  = true;
 648                                 break;
 649                         }
 650                 }
 651
 652                 if (!found)
 653                         continue;
 654
 655                 /* enable rx streaming */
 656                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 657                         ieee80211_queue_work(wl->hw,
 658                                              &wlvif->rx_streaming_enable_work);
 659
 660                 mod_timer(&wlvif->rx_streaming_timer,
 661                           jiffies + msecs_to_jiffies(timeout));
 662         }
 663 }
 664
 665 void wl1271_tx_work_locked(struct wl1271 *wl)
 666 {
 667         struct wl12xx_vif *wlvif;
 668         struct sk_buff *skb;
 669         struct wl1271_tx_hw_descr *desc;
 670         u32 buf_offset = 0, last_len = 0;
 671         bool sent_packets = false;
 672         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 673         int ret;
 674
 675         if (unlikely(wl->state == WL1271_STATE_OFF))
 676                 return;
 677
 678         while ((skb = wl1271_skb_dequeue(wl))) {
 679                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 680                 bool has_data = false;
 681
 682                 wlvif = NULL;
 683                 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
 684                         wlvif = wl12xx_vif_to_data(info->control.vif);
 685
 686                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 687                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
 688                 if (ret == -EAGAIN) {
 689                         /*
 690                          * Aggregation buffer is full.
 691                          * Flush buffer and try again.
 692                          */
 693                         wl1271_skb_queue_head(wl, wlvif, skb);
 694
 695                         buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
 696                                                             last_len);
 697                         wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 698                                           buf_offset, true);
 699                         sent_packets = true;
 700                         buf_offset = 0;
 701                         continue;
 702                 } else if (ret == -EBUSY) {
 703                         /*
 704                          * Firmware buffer is full.
 705                          * Queue back last skb, and stop aggregating.
 706                          */
 707                         wl1271_skb_queue_head(wl, wlvif, skb);
 708                         /* No work left, avoid scheduling redundant tx work */
 709                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 710                         goto out_ack;
 711                 } else if (ret < 0) {
 712                         if (wl12xx_is_dummy_packet(wl, skb))
 713                                 /*
 714                                  * fw still expects dummy packet,
 715                                  * so re-enqueue it
 716                                  */
 717                                 wl1271_skb_queue_head(wl, wlvif, skb);
 718                         else
 719                                 ieee80211_free_txskb(wl->hw, skb);
 720                         goto out_ack;
 721                 }
 722                 last_len = ret;
 723                 buf_offset += last_len;
 724                 wl->tx_packets_count++;
 725                 if (has_data) {
 726                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 727                         __set_bit(desc->hlid, active_hlids);
 728                 }
 729         }
 730
 731 out_ack:
 732         if (buf_offset) {
 733                 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
 734                 wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 735                                   buf_offset, true);
 736                 sent_packets = true;
 737         }
 738         if (sent_packets) {
 739                 /*
 740                  * Interrupt the firmware with the new packets. This is only
 741                  * required for older hardware revisions
 742                  */
 743                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION)
 744                         wl1271_write32(wl, WL12XX_HOST_WR_ACCESS,
 745                                        wl->tx_packets_count);
 746
 747                 wl1271_handle_tx_low_watermark(wl);
 748         }
 749         wl12xx_rearm_rx_streaming(wl, active_hlids);
 750 }
 751
 752 void wl1271_tx_work(struct work_struct *work)
 753 {
 754         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 755         int ret;
 756
 757         mutex_lock(&wl->mutex);
 758         ret = wl1271_ps_elp_wakeup(wl);
 759         if (ret < 0)
 760                 goto out;
 761
 762         wl1271_tx_work_locked(wl);
 763
 764         wl1271_ps_elp_sleep(wl);
 765 out:
 766         mutex_unlock(&wl->mutex);
 767 }
 768
 769 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 770 {
 771         u8 flags = 0;
 772
 773         /*
 774          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 775          * only it uses Tx-completion.
 776          */
 777         if (rate_class_index <= 8)
 778                 flags |= IEEE80211_TX_RC_MCS;
 779
 780         /*
 781          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 782          * only it uses Tx-completion.
 783          */
 784         if (rate_class_index == 0)
 785                 flags |= IEEE80211_TX_RC_SHORT_GI;
 786
 787         return flags;
 788 }
 789
 790 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 791                                       struct wl1271_tx_hw_res_descr *result)
 792 {
 793         struct ieee80211_tx_info *info;
 794         struct ieee80211_vif *vif;
 795         struct wl12xx_vif *wlvif;
 796         struct sk_buff *skb;
 797         int id = result->id;
 798         int rate = -1;
 799         u8 rate_flags = 0;
 800         u8 retries = 0;
 801
 802         /* check for id legality */
 803         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 804                 wl1271_warning("TX result illegal id: %d", id);
 805                 return;
 806         }
 807
 808         skb = wl->tx_frames[id];
 809         info = IEEE80211_SKB_CB(skb);
 810
 811         if (wl12xx_is_dummy_packet(wl, skb)) {
 812                 wl1271_free_tx_id(wl, id);
 813                 return;
 814         }
 815
 816         /* info->control is valid as long as we don't update info->status */
 817         vif = info->control.vif;
 818         wlvif = wl12xx_vif_to_data(vif);
 819
 820         /* update the TX status info */
 821         if (result->status == TX_SUCCESS) {
 822                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 823                         info->flags |= IEEE80211_TX_STAT_ACK;
 824                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 825                                           wlvif->band);
 826                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 827                 retries = result->ack_failures;
 828         } else if (result->status == TX_RETRY_EXCEEDED) {
 829                 wl->stats.excessive_retries++;
 830                 retries = result->ack_failures;
 831         }
 832
 833         info->status.rates[0].idx = rate;
 834         info->status.rates[0].count = retries;
 835         info->status.rates[0].flags = rate_flags;
 836         info->status.ack_signal = -1;
 837
 838         wl->stats.retry_count += result->ack_failures;
 839
 840         /*
 841          * update sequence number only when relevant, i.e. only in
 842          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 843          */
 844         if (info->control.hw_key &&
 845             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 846              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 847              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 848                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 849                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 850
 851                 /*
 852                  * update security sequence number, taking care of potential
 853                  * wrap-around
 854                  */
 855                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 856                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 857         }
 858
 859         /* remove private header from packet */
 860         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 861
 862         /* remove TKIP header space if present */
 863         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 864             info->control.hw_key &&
 865             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 866                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 867                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 868                         hdrlen);
 869                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 870         }
 871
 872         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 873                      " status 0x%x",
 874                      result->id, skb, result->ack_failures,
 875                      result->rate_class_index, result->status);
 876
 877         /* return the packet to the stack */
 878         skb_queue_tail(&wl->deferred_tx_queue, skb);
 879         queue_work(wl->freezable_wq, &wl->netstack_work);
 880         wl1271_free_tx_id(wl, result->id);
 881 }
 882
 883 /* Called upon reception of a TX complete interrupt */
 884 void wl1271_tx_complete(struct wl1271 *wl)
 885 {
 886         struct wl1271_acx_mem_map *memmap =
 887                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 888         u32 count, fw_counter;
 889         u32 i;
 890
 891         /* read the tx results from the chipset */
 892         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 893                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 894         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 895
 896         /* write host counter to chipset (to ack) */
 897         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 898                        offsetof(struct wl1271_tx_hw_res_if,
 899                                 tx_result_host_counter), fw_counter);
 900
 901         count = fw_counter - wl->tx_results_count;
 902         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 903
 904         /* verify that the result buffer is not getting overrun */
 905         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 906                 wl1271_warning("TX result overflow from chipset: %d", count);
 907
 908         /* process the results */
 909         for (i = 0; i < count; i++) {
 910                 struct wl1271_tx_hw_res_descr *result;
 911                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 912
 913                 /* process the packet */
 914                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 915                 wl1271_tx_complete_packet(wl, result);
 916
 917                 wl->tx_results_count++;
 918         }
 919 }
 920 EXPORT_SYMBOL(wl1271_tx_complete);
 921
 922 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 923 {
 924         struct sk_buff *skb;
 925         int i;
 926         unsigned long flags;
 927         struct ieee80211_tx_info *info;
 928         int total[NUM_TX_QUEUES];
 929
 930         for (i = 0; i < NUM_TX_QUEUES; i++) {
 931                 total[i] = 0;
 932                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 933                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 934
 935                         if (!wl12xx_is_dummy_packet(wl, skb)) {
 936                                 info = IEEE80211_SKB_CB(skb);
 937                                 info->status.rates[0].idx = -1;
 938                                 info->status.rates[0].count = 0;
 939                                 ieee80211_tx_status_ni(wl->hw, skb);
 940                         }
 941
 942                         total[i]++;
 943                 }
 944         }
 945
 946         spin_lock_irqsave(&wl->wl_lock, flags);
 947         for (i = 0; i < NUM_TX_QUEUES; i++)
 948                 wl->tx_queue_count[i] -= total[i];
 949         spin_unlock_irqrestore(&wl->wl_lock, flags);
 950
 951         wl1271_handle_tx_low_watermark(wl);
 952 }
 953
 954 /* caller must hold wl->mutex and TX must be stopped */
 955 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 956 {
 957         int i;
 958
 959         /* TX failure */
 960         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
 961                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 962                         wl1271_free_sta(wl, wlvif, i);
 963                 else
 964                         wlvif->sta.ba_rx_bitmap = 0;
 965
 966                 wl->links[i].allocated_pkts = 0;
 967                 wl->links[i].prev_freed_pkts = 0;
 968         }
 969         wlvif->last_tx_hlid = 0;
 970
 971 }
 972 /* caller must hold wl->mutex and TX must be stopped */
 973 void wl12xx_tx_reset(struct wl1271 *wl)
 974 {
 975         int i;
 976         struct sk_buff *skb;
 977         struct ieee80211_tx_info *info;
 978
 979         /* only reset the queues if something bad happened */
 980         if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
 981                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
 982                         wl1271_tx_reset_link_queues(wl, i);
 983
 984                 for (i = 0; i < NUM_TX_QUEUES; i++)
 985                         wl->tx_queue_count[i] = 0;
 986         }
 987
 988         /*
 989          * Make sure the driver is at a consistent state, in case this
 990          * function is called from a context other than interface removal.
 991          * This call will always wake the TX queues.
 992          */
 993         wl1271_handle_tx_low_watermark(wl);
 994
 995         for (i = 0; i < wl->num_tx_desc; i++) {
 996                 if (wl->tx_frames[i] == NULL)
 997                         continue;
 998
 999                 skb = wl->tx_frames[i];
1000                 wl1271_free_tx_id(wl, i);
1001                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1002
1003                 if (!wl12xx_is_dummy_packet(wl, skb)) {
1004                         /*
1005                          * Remove private headers before passing the skb to
1006                          * mac80211
1007                          */
1008                         info = IEEE80211_SKB_CB(skb);
1009                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1010                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1011                             info->control.hw_key &&
1012                             info->control.hw_key->cipher ==
1013                             WLAN_CIPHER_SUITE_TKIP) {
1014                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1015                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1016                                         skb->data, hdrlen);
1017                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1018                         }
1019
1020                         info->status.rates[0].idx = -1;
1021                         info->status.rates[0].count = 0;
1022
1023                         ieee80211_tx_status_ni(wl->hw, skb);
1024                 }
1025         }
1026 }
1027
1028 #define WL1271_TX_FLUSH_TIMEOUT 500000
1029
1030 /* caller must *NOT* hold wl->mutex */
1031 void wl1271_tx_flush(struct wl1271 *wl)
1032 {
1033         unsigned long timeout;
1034         int i;
1035         timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1036
1037         /* only one flush should be in progress, for consistent queue state */
1038         mutex_lock(&wl->flush_mutex);
1039
1040         wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1041
1042         while (!time_after(jiffies, timeout)) {
1043                 mutex_lock(&wl->mutex);
1044                 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
1045                              wl->tx_frames_cnt,
1046                              wl1271_tx_total_queue_count(wl));
1047                 if ((wl->tx_frames_cnt == 0) &&
1048                     (wl1271_tx_total_queue_count(wl) == 0)) {
1049                         mutex_unlock(&wl->mutex);
1050                         goto out;
1051                 }
1052                 mutex_unlock(&wl->mutex);
1053                 msleep(1);
1054         }
1055
1056         wl1271_warning("Unable to flush all TX buffers, timed out.");
1057
1058         /* forcibly flush all Tx buffers on our queues */
1059         mutex_lock(&wl->mutex);
1060         for (i = 0; i < WL12XX_MAX_LINKS; i++)
1061                 wl1271_tx_reset_link_queues(wl, i);
1062         mutex_unlock(&wl->mutex);
1063
1064 out:
1065         wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1066         mutex_unlock(&wl->flush_mutex);
1067 }
1068 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1069
1070 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1071 {
1072         if (WARN_ON(!rate_set))
1073                 return 0;
1074
1075         return BIT(__ffs(rate_set));
1076 }
1077
1078 void wlcore_stop_queue_locked(struct wl1271 *wl, u8 queue,
1079                               enum wlcore_queue_stop_reason reason)
1080 {
1081         bool stopped = !!wl->queue_stop_reasons[queue];
1082
1083         /* queue should not be stopped for this reason */
1084         WARN_ON(test_and_set_bit(reason, &wl->queue_stop_reasons[queue]));
1085
1086         if (stopped)
1087                 return;
1088
1089         ieee80211_stop_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1090 }
1091
1092 void wlcore_stop_queue(struct wl1271 *wl, u8 queue,
1093                        enum wlcore_queue_stop_reason reason)
1094 {
1095         unsigned long flags;
1096
1097         spin_lock_irqsave(&wl->wl_lock, flags);
1098         wlcore_stop_queue_locked(wl, queue, reason);
1099         spin_unlock_irqrestore(&wl->wl_lock, flags);
1100 }
1101
1102 void wlcore_wake_queue(struct wl1271 *wl, u8 queue,
1103                        enum wlcore_queue_stop_reason reason)
1104 {
1105         unsigned long flags;
1106
1107         spin_lock_irqsave(&wl->wl_lock, flags);
1108
1109         /* queue should not be clear for this reason */
1110         WARN_ON(!test_and_clear_bit(reason, &wl->queue_stop_reasons[queue]));
1111
1112         if (wl->queue_stop_reasons[queue])
1113                 goto out;
1114
1115         ieee80211_wake_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1116
1117 out:
1118         spin_unlock_irqrestore(&wl->wl_lock, flags);
1119 }
1120
1121 void wlcore_stop_queues(struct wl1271 *wl,
1122                         enum wlcore_queue_stop_reason reason)
1123 {
1124         int i;
1125
1126         for (i = 0; i < NUM_TX_QUEUES; i++)
1127                 wlcore_stop_queue(wl, i, reason);
1128 }
1129 EXPORT_SYMBOL_GPL(wlcore_stop_queues);
1130
1131 void wlcore_wake_queues(struct wl1271 *wl,
1132                         enum wlcore_queue_stop_reason reason)
1133 {
1134         int i;
1135
1136         for (i = 0; i < NUM_TX_QUEUES; i++)
1137                 wlcore_wake_queue(wl, i, reason);
1138 }
1139 EXPORT_SYMBOL_GPL(wlcore_wake_queues);
1140
1141 void wlcore_reset_stopped_queues(struct wl1271 *wl)
1142 {
1143         int i;
1144         unsigned long flags;
1145
1146         spin_lock_irqsave(&wl->wl_lock, flags);
1147
1148         for (i = 0; i < NUM_TX_QUEUES; i++) {
1149                 if (!wl->queue_stop_reasons[i])
1150                         continue;
1151
1152                 wl->queue_stop_reasons[i] = 0;
1153                 ieee80211_wake_queue(wl->hw,
1154                                      wl1271_tx_get_mac80211_queue(i));
1155         }
1156
1157         spin_unlock_irqrestore(&wl->wl_lock, flags);
1158 }
1159
1160 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, u8 queue,
1161                              enum wlcore_queue_stop_reason reason)
1162 {
1163         return test_bit(reason, &wl->queue_stop_reasons[queue]);
1164 }
1165
1166 bool wlcore_is_queue_stopped(struct wl1271 *wl, u8 queue)
1167 {
1168         return !!wl->queue_stop_reasons[queue];
1169 }