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                 /* if the packets are destined for AP (have a STA entry)
 309                    send them with AP rate policies, otherwise use default
 310                    basic rates */
 311                 if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 312                         rate_idx = wlvif->sta.p2p_rate_idx;
 313                 else if (control->control.sta)
 314                         rate_idx = wlvif->sta.ap_rate_idx;
 315                 else
 316                         rate_idx = wlvif->sta.basic_rate_idx;
 317         } else {
 318                 if (hlid == wlvif->ap.global_hlid)
 319                         rate_idx = wlvif->ap.mgmt_rate_idx;
 320                 else if (hlid == wlvif->ap.bcast_hlid)
 321                         rate_idx = wlvif->ap.bcast_rate_idx;
 322                 else
 323                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 324         }
 325
 326         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 327
 328         /* for WEP shared auth - no fw encryption is needed */
 329         if (ieee80211_is_auth(frame_control) &&
 330             ieee80211_has_protected(frame_control))
 331                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 332
 333         desc->tx_attr = cpu_to_le16(tx_attr);
 334
 335         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 336         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 337 }
 338
 339 /* caller must hold wl->mutex */
 340 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 341                                    struct sk_buff *skb, u32 buf_offset)
 342 {
 343         struct ieee80211_tx_info *info;
 344         u32 extra = 0;
 345         int ret = 0;
 346         u32 total_len;
 347         u8 hlid;
 348         bool is_dummy;
 349         bool is_gem = false;
 350
 351         if (!skb)
 352                 return -EINVAL;
 353
 354         info = IEEE80211_SKB_CB(skb);
 355
 356         /* TODO: handle dummy packets on multi-vifs */
 357         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 358
 359         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 360             info->control.hw_key &&
 361             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 362                 extra = WL1271_EXTRA_SPACE_TKIP;
 363
 364         if (info->control.hw_key) {
 365                 bool is_wep;
 366                 u8 idx = info->control.hw_key->hw_key_idx;
 367                 u32 cipher = info->control.hw_key->cipher;
 368
 369                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 370                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 371
 372                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 373                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 374                         if (ret < 0)
 375                                 return ret;
 376                         wlvif->default_key = idx;
 377                 }
 378
 379                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 380         }
 381         hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 382         if (hlid == WL12XX_INVALID_LINK_ID) {
 383                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 384                 return -EINVAL;
 385         }
 386
 387         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
 388                                  is_gem);
 389         if (ret < 0)
 390                 return ret;
 391
 392         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 393
 394         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 395                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 396                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 397         }
 398
 399         /*
 400          * The length of each packet is stored in terms of
 401          * words. Thus, we must pad the skb data to make sure its
 402          * length is aligned.  The number of padding bytes is computed
 403          * and set in wl1271_tx_fill_hdr.
 404          * In special cases, we want to align to a specific block size
 405          * (eg. for wl128x with SDIO we align to 256).
 406          */
 407         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 408
 409         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 410         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 411
 412         /* Revert side effects in the dummy packet skb, so it can be reused */
 413         if (is_dummy)
 414                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 415
 416         return total_len;
 417 }
 418
 419 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 420                                 enum ieee80211_band rate_band)
 421 {
 422         struct ieee80211_supported_band *band;
 423         u32 enabled_rates = 0;
 424         int bit;
 425
 426         band = wl->hw->wiphy->bands[rate_band];
 427         for (bit = 0; bit < band->n_bitrates; bit++) {
 428                 if (rate_set & 0x1)
 429                         enabled_rates |= band->bitrates[bit].hw_value;
 430                 rate_set >>= 1;
 431         }
 432
 433         /* MCS rates indication are on bits 16 - 31 */
 434         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 435
 436         for (bit = 0; bit < 16; bit++) {
 437                 if (rate_set & 0x1)
 438                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 439                 rate_set >>= 1;
 440         }
 441
 442         return enabled_rates;
 443 }
 444
 445 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 446 {
 447         int i;
 448
 449         for (i = 0; i < NUM_TX_QUEUES; i++) {
 450                 if (wlcore_is_queue_stopped_by_reason(wl, i,
 451                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 452                     wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 453                         /* firmware buffer has space, restart queues */
 454                         wlcore_wake_queue(wl, i,
 455                                           WLCORE_QUEUE_STOP_REASON_WATERMARK);
 456                 }
 457         }
 458 }
 459
 460 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
 461                                                 struct sk_buff_head *queues)
 462 {
 463         int i, q = -1, ac;
 464         u32 min_pkts = 0xffffffff;
 465
 466         /*
 467          * Find a non-empty ac where:
 468          * 1. There are packets to transmit
 469          * 2. The FW has the least allocated blocks
 470          *
 471          * We prioritize the ACs according to VO>VI>BE>BK
 472          */
 473         for (i = 0; i < NUM_TX_QUEUES; i++) {
 474                 ac = wl1271_tx_get_queue(i);
 475                 if (!skb_queue_empty(&queues[ac]) &&
 476                     (wl->tx_allocated_pkts[ac] < min_pkts)) {
 477                         q = ac;
 478                         min_pkts = wl->tx_allocated_pkts[q];
 479                 }
 480         }
 481
 482         if (q == -1)
 483                 return NULL;
 484
 485         return &queues[q];
 486 }
 487
 488 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
 489                                               struct wl1271_link *lnk)
 490 {
 491         struct sk_buff *skb;
 492         unsigned long flags;
 493         struct sk_buff_head *queue;
 494
 495         queue = wl1271_select_queue(wl, lnk->tx_queue);
 496         if (!queue)
 497                 return NULL;
 498
 499         skb = skb_dequeue(queue);
 500         if (skb) {
 501                 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 502                 spin_lock_irqsave(&wl->wl_lock, flags);
 503                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 504                 wl->tx_queue_count[q]--;
 505                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 506         }
 507
 508         return skb;
 509 }
 510
 511 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
 512                                               struct wl12xx_vif *wlvif)
 513 {
 514         struct sk_buff *skb = NULL;
 515         int i, h, start_hlid;
 516
 517         /* start from the link after the last one */
 518         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 519
 520         /* dequeue according to AC, round robin on each link */
 521         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 522                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 523
 524                 /* only consider connected stations */
 525                 if (!test_bit(h, wlvif->links_map))
 526                         continue;
 527
 528                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
 529                 if (!skb)
 530                         continue;
 531
 532                 wlvif->last_tx_hlid = h;
 533                 break;
 534         }
 535
 536         if (!skb)
 537                 wlvif->last_tx_hlid = 0;
 538
 539         return skb;
 540 }
 541
 542 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 543 {
 544         unsigned long flags;
 545         struct wl12xx_vif *wlvif = wl->last_wlvif;
 546         struct sk_buff *skb = NULL;
 547
 548         /* continue from last wlvif (round robin) */
 549         if (wlvif) {
 550                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 551                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 552                         if (skb) {
 553                                 wl->last_wlvif = wlvif;
 554                                 break;
 555                         }
 556                 }
 557         }
 558
 559         /* dequeue from the system HLID before the restarting wlvif list */
 560         if (!skb)
 561                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
 562
 563         /* do a new pass over the wlvif list */
 564         if (!skb) {
 565                 wl12xx_for_each_wlvif(wl, wlvif) {
 566                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 567                         if (skb) {
 568                                 wl->last_wlvif = wlvif;
 569                                 break;
 570                         }
 571
 572                         /*
 573                          * No need to continue after last_wlvif. The previous
 574                          * pass should have found it.
 575                          */
 576                         if (wlvif == wl->last_wlvif)
 577                                 break;
 578                 }
 579         }
 580
 581         if (!skb &&
 582             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 583                 int q;
 584
 585                 skb = wl->dummy_packet;
 586                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 587                 spin_lock_irqsave(&wl->wl_lock, flags);
 588                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 589                 wl->tx_queue_count[q]--;
 590                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 591         }
 592
 593         return skb;
 594 }
 595
 596 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 597                                   struct sk_buff *skb)
 598 {
 599         unsigned long flags;
 600         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 601
 602         if (wl12xx_is_dummy_packet(wl, skb)) {
 603                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 604         } else {
 605                 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 606                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 607
 608                 /* make sure we dequeue the same packet next time */
 609                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 610                                       WL12XX_MAX_LINKS;
 611         }
 612
 613         spin_lock_irqsave(&wl->wl_lock, flags);
 614         wl->tx_queue_count[q]++;
 615         spin_unlock_irqrestore(&wl->wl_lock, flags);
 616 }
 617
 618 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 619 {
 620         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 621
 622         return ieee80211_is_data_present(hdr->frame_control);
 623 }
 624
 625 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 626 {
 627         struct wl12xx_vif *wlvif;
 628         u32 timeout;
 629         u8 hlid;
 630
 631         if (!wl->conf.rx_streaming.interval)
 632                 return;
 633
 634         if (!wl->conf.rx_streaming.always &&
 635             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 636                 return;
 637
 638         timeout = wl->conf.rx_streaming.duration;
 639         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 640                 bool found = false;
 641                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 642                         if (test_bit(hlid, wlvif->links_map)) {
 643                                 found  = true;
 644                                 break;
 645                         }
 646                 }
 647
 648                 if (!found)
 649                         continue;
 650
 651                 /* enable rx streaming */
 652                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 653                         ieee80211_queue_work(wl->hw,
 654                                              &wlvif->rx_streaming_enable_work);
 655
 656                 mod_timer(&wlvif->rx_streaming_timer,
 657                           jiffies + msecs_to_jiffies(timeout));
 658         }
 659 }
 660
 661 void wl1271_tx_work_locked(struct wl1271 *wl)
 662 {
 663         struct wl12xx_vif *wlvif;
 664         struct sk_buff *skb;
 665         struct wl1271_tx_hw_descr *desc;
 666         u32 buf_offset = 0, last_len = 0;
 667         bool sent_packets = false;
 668         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 669         int ret;
 670
 671         if (unlikely(wl->state == WL1271_STATE_OFF))
 672                 return;
 673
 674         while ((skb = wl1271_skb_dequeue(wl))) {
 675                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 676                 bool has_data = false;
 677
 678                 wlvif = NULL;
 679                 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
 680                         wlvif = wl12xx_vif_to_data(info->control.vif);
 681
 682                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 683                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
 684                 if (ret == -EAGAIN) {
 685                         /*
 686                          * Aggregation buffer is full.
 687                          * Flush buffer and try again.
 688                          */
 689                         wl1271_skb_queue_head(wl, wlvif, skb);
 690
 691                         buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
 692                                                             last_len);
 693                         wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 694                                           buf_offset, true);
 695                         sent_packets = true;
 696                         buf_offset = 0;
 697                         continue;
 698                 } else if (ret == -EBUSY) {
 699                         /*
 700                          * Firmware buffer is full.
 701                          * Queue back last skb, and stop aggregating.
 702                          */
 703                         wl1271_skb_queue_head(wl, wlvif, skb);
 704                         /* No work left, avoid scheduling redundant tx work */
 705                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 706                         goto out_ack;
 707                 } else if (ret < 0) {
 708                         if (wl12xx_is_dummy_packet(wl, skb))
 709                                 /*
 710                                  * fw still expects dummy packet,
 711                                  * so re-enqueue it
 712                                  */
 713                                 wl1271_skb_queue_head(wl, wlvif, skb);
 714                         else
 715                                 ieee80211_free_txskb(wl->hw, skb);
 716                         goto out_ack;
 717                 }
 718                 last_len = ret;
 719                 buf_offset += last_len;
 720                 wl->tx_packets_count++;
 721                 if (has_data) {
 722                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 723                         __set_bit(desc->hlid, active_hlids);
 724                 }
 725         }
 726
 727 out_ack:
 728         if (buf_offset) {
 729                 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
 730                 wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 731                                   buf_offset, true);
 732                 sent_packets = true;
 733         }
 734         if (sent_packets) {
 735                 /*
 736                  * Interrupt the firmware with the new packets. This is only
 737                  * required for older hardware revisions
 738                  */
 739                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION)
 740                         wl1271_write32(wl, WL12XX_HOST_WR_ACCESS,
 741                                        wl->tx_packets_count);
 742
 743                 wl1271_handle_tx_low_watermark(wl);
 744         }
 745         wl12xx_rearm_rx_streaming(wl, active_hlids);
 746 }
 747
 748 void wl1271_tx_work(struct work_struct *work)
 749 {
 750         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 751         int ret;
 752
 753         mutex_lock(&wl->mutex);
 754         ret = wl1271_ps_elp_wakeup(wl);
 755         if (ret < 0)
 756                 goto out;
 757
 758         wl1271_tx_work_locked(wl);
 759
 760         wl1271_ps_elp_sleep(wl);
 761 out:
 762         mutex_unlock(&wl->mutex);
 763 }
 764
 765 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 766 {
 767         u8 flags = 0;
 768
 769         /*
 770          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 771          * only it uses Tx-completion.
 772          */
 773         if (rate_class_index <= 8)
 774                 flags |= IEEE80211_TX_RC_MCS;
 775
 776         /*
 777          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 778          * only it uses Tx-completion.
 779          */
 780         if (rate_class_index == 0)
 781                 flags |= IEEE80211_TX_RC_SHORT_GI;
 782
 783         return flags;
 784 }
 785
 786 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 787                                       struct wl1271_tx_hw_res_descr *result)
 788 {
 789         struct ieee80211_tx_info *info;
 790         struct ieee80211_vif *vif;
 791         struct wl12xx_vif *wlvif;
 792         struct sk_buff *skb;
 793         int id = result->id;
 794         int rate = -1;
 795         u8 rate_flags = 0;
 796         u8 retries = 0;
 797
 798         /* check for id legality */
 799         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 800                 wl1271_warning("TX result illegal id: %d", id);
 801                 return;
 802         }
 803
 804         skb = wl->tx_frames[id];
 805         info = IEEE80211_SKB_CB(skb);
 806
 807         if (wl12xx_is_dummy_packet(wl, skb)) {
 808                 wl1271_free_tx_id(wl, id);
 809                 return;
 810         }
 811
 812         /* info->control is valid as long as we don't update info->status */
 813         vif = info->control.vif;
 814         wlvif = wl12xx_vif_to_data(vif);
 815
 816         /* update the TX status info */
 817         if (result->status == TX_SUCCESS) {
 818                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 819                         info->flags |= IEEE80211_TX_STAT_ACK;
 820                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 821                                           wlvif->band);
 822                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 823                 retries = result->ack_failures;
 824         } else if (result->status == TX_RETRY_EXCEEDED) {
 825                 wl->stats.excessive_retries++;
 826                 retries = result->ack_failures;
 827         }
 828
 829         info->status.rates[0].idx = rate;
 830         info->status.rates[0].count = retries;
 831         info->status.rates[0].flags = rate_flags;
 832         info->status.ack_signal = -1;
 833
 834         wl->stats.retry_count += result->ack_failures;
 835
 836         /*
 837          * update sequence number only when relevant, i.e. only in
 838          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 839          */
 840         if (info->control.hw_key &&
 841             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 842              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 843              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 844                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 845                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 846
 847                 /*
 848                  * update security sequence number, taking care of potential
 849                  * wrap-around
 850                  */
 851                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 852                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 853         }
 854
 855         /* remove private header from packet */
 856         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 857
 858         /* remove TKIP header space if present */
 859         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 860             info->control.hw_key &&
 861             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 862                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 863                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 864                         hdrlen);
 865                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 866         }
 867
 868         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 869                      " status 0x%x",
 870                      result->id, skb, result->ack_failures,
 871                      result->rate_class_index, result->status);
 872
 873         /* return the packet to the stack */
 874         skb_queue_tail(&wl->deferred_tx_queue, skb);
 875         queue_work(wl->freezable_wq, &wl->netstack_work);
 876         wl1271_free_tx_id(wl, result->id);
 877 }
 878
 879 /* Called upon reception of a TX complete interrupt */
 880 void wl1271_tx_complete(struct wl1271 *wl)
 881 {
 882         struct wl1271_acx_mem_map *memmap =
 883                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 884         u32 count, fw_counter;
 885         u32 i;
 886
 887         /* read the tx results from the chipset */
 888         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 889                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 890         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 891
 892         /* write host counter to chipset (to ack) */
 893         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 894                        offsetof(struct wl1271_tx_hw_res_if,
 895                                 tx_result_host_counter), fw_counter);
 896
 897         count = fw_counter - wl->tx_results_count;
 898         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 899
 900         /* verify that the result buffer is not getting overrun */
 901         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 902                 wl1271_warning("TX result overflow from chipset: %d", count);
 903
 904         /* process the results */
 905         for (i = 0; i < count; i++) {
 906                 struct wl1271_tx_hw_res_descr *result;
 907                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 908
 909                 /* process the packet */
 910                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 911                 wl1271_tx_complete_packet(wl, result);
 912
 913                 wl->tx_results_count++;
 914         }
 915 }
 916 EXPORT_SYMBOL(wl1271_tx_complete);
 917
 918 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 919 {
 920         struct sk_buff *skb;
 921         int i;
 922         unsigned long flags;
 923         struct ieee80211_tx_info *info;
 924         int total[NUM_TX_QUEUES];
 925
 926         for (i = 0; i < NUM_TX_QUEUES; i++) {
 927                 total[i] = 0;
 928                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 929                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 930
 931                         if (!wl12xx_is_dummy_packet(wl, skb)) {
 932                                 info = IEEE80211_SKB_CB(skb);
 933                                 info->status.rates[0].idx = -1;
 934                                 info->status.rates[0].count = 0;
 935                                 ieee80211_tx_status_ni(wl->hw, skb);
 936                         }
 937
 938                         total[i]++;
 939                 }
 940         }
 941
 942         spin_lock_irqsave(&wl->wl_lock, flags);
 943         for (i = 0; i < NUM_TX_QUEUES; i++)
 944                 wl->tx_queue_count[i] -= total[i];
 945         spin_unlock_irqrestore(&wl->wl_lock, flags);
 946
 947         wl1271_handle_tx_low_watermark(wl);
 948 }
 949
 950 /* caller must hold wl->mutex and TX must be stopped */
 951 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 952 {
 953         int i;
 954
 955         /* TX failure */
 956         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
 957                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 958                         wl1271_free_sta(wl, wlvif, i);
 959                 else
 960                         wlvif->sta.ba_rx_bitmap = 0;
 961
 962                 wl->links[i].allocated_pkts = 0;
 963                 wl->links[i].prev_freed_pkts = 0;
 964         }
 965         wlvif->last_tx_hlid = 0;
 966
 967 }
 968 /* caller must hold wl->mutex and TX must be stopped */
 969 void wl12xx_tx_reset(struct wl1271 *wl)
 970 {
 971         int i;
 972         struct sk_buff *skb;
 973         struct ieee80211_tx_info *info;
 974
 975         /* only reset the queues if something bad happened */
 976         if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
 977                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
 978                         wl1271_tx_reset_link_queues(wl, i);
 979
 980                 for (i = 0; i < NUM_TX_QUEUES; i++)
 981                         wl->tx_queue_count[i] = 0;
 982         }
 983
 984         /*
 985          * Make sure the driver is at a consistent state, in case this
 986          * function is called from a context other than interface removal.
 987          * This call will always wake the TX queues.
 988          */
 989         wl1271_handle_tx_low_watermark(wl);
 990
 991         for (i = 0; i < wl->num_tx_desc; i++) {
 992                 if (wl->tx_frames[i] == NULL)
 993                         continue;
 994
 995                 skb = wl->tx_frames[i];
 996                 wl1271_free_tx_id(wl, i);
 997                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
 998
 999                 if (!wl12xx_is_dummy_packet(wl, skb)) {
1000                         /*
1001                          * Remove private headers before passing the skb to
1002                          * mac80211
1003                          */
1004                         info = IEEE80211_SKB_CB(skb);
1005                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1006                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1007                             info->control.hw_key &&
1008                             info->control.hw_key->cipher ==
1009                             WLAN_CIPHER_SUITE_TKIP) {
1010                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1011                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1012                                         skb->data, hdrlen);
1013                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1014                         }
1015
1016                         info->status.rates[0].idx = -1;
1017                         info->status.rates[0].count = 0;
1018
1019                         ieee80211_tx_status_ni(wl->hw, skb);
1020                 }
1021         }
1022 }
1023
1024 #define WL1271_TX_FLUSH_TIMEOUT 500000
1025
1026 /* caller must *NOT* hold wl->mutex */
1027 void wl1271_tx_flush(struct wl1271 *wl)
1028 {
1029         unsigned long timeout;
1030         int i;
1031         timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1032
1033         /* only one flush should be in progress, for consistent queue state */
1034         mutex_lock(&wl->flush_mutex);
1035
1036         wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1037
1038         while (!time_after(jiffies, timeout)) {
1039                 mutex_lock(&wl->mutex);
1040                 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
1041                              wl->tx_frames_cnt,
1042                              wl1271_tx_total_queue_count(wl));
1043                 if ((wl->tx_frames_cnt == 0) &&
1044                     (wl1271_tx_total_queue_count(wl) == 0)) {
1045                         mutex_unlock(&wl->mutex);
1046                         goto out;
1047                 }
1048                 mutex_unlock(&wl->mutex);
1049                 msleep(1);
1050         }
1051
1052         wl1271_warning("Unable to flush all TX buffers, timed out.");
1053
1054         /* forcibly flush all Tx buffers on our queues */
1055         mutex_lock(&wl->mutex);
1056         for (i = 0; i < WL12XX_MAX_LINKS; i++)
1057                 wl1271_tx_reset_link_queues(wl, i);
1058         mutex_unlock(&wl->mutex);
1059
1060 out:
1061         wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1062         mutex_unlock(&wl->flush_mutex);
1063 }
1064 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1065
1066 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1067 {
1068         if (WARN_ON(!rate_set))
1069                 return 0;
1070
1071         return BIT(__ffs(rate_set));
1072 }
1073
1074 void wlcore_stop_queue_locked(struct wl1271 *wl, u8 queue,
1075                               enum wlcore_queue_stop_reason reason)
1076 {
1077         bool stopped = !!wl->queue_stop_reasons[queue];
1078
1079         /* queue should not be stopped for this reason */
1080         WARN_ON(test_and_set_bit(reason, &wl->queue_stop_reasons[queue]));
1081
1082         if (stopped)
1083                 return;
1084
1085         ieee80211_stop_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1086 }
1087
1088 void wlcore_stop_queue(struct wl1271 *wl, u8 queue,
1089                        enum wlcore_queue_stop_reason reason)
1090 {
1091         unsigned long flags;
1092
1093         spin_lock_irqsave(&wl->wl_lock, flags);
1094         wlcore_stop_queue_locked(wl, queue, reason);
1095         spin_unlock_irqrestore(&wl->wl_lock, flags);
1096 }
1097
1098 void wlcore_wake_queue(struct wl1271 *wl, u8 queue,
1099                        enum wlcore_queue_stop_reason reason)
1100 {
1101         unsigned long flags;
1102
1103         spin_lock_irqsave(&wl->wl_lock, flags);
1104
1105         /* queue should not be clear for this reason */
1106         WARN_ON(!test_and_clear_bit(reason, &wl->queue_stop_reasons[queue]));
1107
1108         if (wl->queue_stop_reasons[queue])
1109                 goto out;
1110
1111         ieee80211_wake_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1112
1113 out:
1114         spin_unlock_irqrestore(&wl->wl_lock, flags);
1115 }
1116
1117 void wlcore_stop_queues(struct wl1271 *wl,
1118                         enum wlcore_queue_stop_reason reason)
1119 {
1120         int i;
1121
1122         for (i = 0; i < NUM_TX_QUEUES; i++)
1123                 wlcore_stop_queue(wl, i, reason);
1124 }
1125 EXPORT_SYMBOL_GPL(wlcore_stop_queues);
1126
1127 void wlcore_wake_queues(struct wl1271 *wl,
1128                         enum wlcore_queue_stop_reason reason)
1129 {
1130         int i;
1131
1132         for (i = 0; i < NUM_TX_QUEUES; i++)
1133                 wlcore_wake_queue(wl, i, reason);
1134 }
1135 EXPORT_SYMBOL_GPL(wlcore_wake_queues);
1136
1137 void wlcore_reset_stopped_queues(struct wl1271 *wl)
1138 {
1139         int i;
1140         unsigned long flags;
1141
1142         spin_lock_irqsave(&wl->wl_lock, flags);
1143
1144         for (i = 0; i < NUM_TX_QUEUES; i++) {
1145                 if (!wl->queue_stop_reasons[i])
1146                         continue;
1147
1148                 wl->queue_stop_reasons[i] = 0;
1149                 ieee80211_wake_queue(wl->hw,
1150                                      wl1271_tx_get_mac80211_queue(i));
1151         }
1152
1153         spin_unlock_irqrestore(&wl->wl_lock, flags);
1154 }
1155
1156 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, u8 queue,
1157                              enum wlcore_queue_stop_reason reason)
1158 {
1159         return test_bit(reason, &wl->queue_stop_reasons[queue]);
1160 }
1161
1162 bool wlcore_is_queue_stopped(struct wl1271 *wl, u8 queue)
1163 {
1164         return !!wl->queue_stop_reasons[queue];
1165 }