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 static 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
  86 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
  87                                                  struct sk_buff *skb)
  88 {
  89         struct ieee80211_hdr *hdr;
  90
  91         /*
  92          * add the station to the known list before transmitting the
  93          * authentication response. this way it won't get de-authed by FW
  94          * when transmitting too soon.
  95          */
  96         hdr = (struct ieee80211_hdr *)(skb->data +
  97                                        sizeof(struct wl1271_tx_hw_descr));
  98         if (ieee80211_is_auth(hdr->frame_control))
  99                 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
 100 }
 101
 102 static void wl1271_tx_regulate_link(struct wl1271 *wl,
 103                                     struct wl12xx_vif *wlvif,
 104                                     u8 hlid)
 105 {
 106         bool fw_ps, single_sta;
 107         u8 tx_pkts;
 108
 109         if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
 110                 return;
 111
 112         fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
 113         tx_pkts = wl->links[hlid].allocated_pkts;
 114         single_sta = (wl->active_sta_count == 1);
 115
 116         /*
 117          * if in FW PS and there is enough data in FW we can put the link
 118          * into high-level PS and clean out its TX queues.
 119          * Make an exception if this is the only connected station. In this
 120          * case FW-memory congestion is not a problem.
 121          */
 122         if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
 123                 wl12xx_ps_link_start(wl, wlvif, hlid, true);
 124 }
 125
 126 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
 127 {
 128         return wl->dummy_packet == skb;
 129 }
 130
 131 u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 132                          struct sk_buff *skb)
 133 {
 134         struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
 135
 136         if (control->control.sta) {
 137                 struct wl1271_station *wl_sta;
 138
 139                 wl_sta = (struct wl1271_station *)
 140                                 control->control.sta->drv_priv;
 141                 return wl_sta->hlid;
 142         } else {
 143                 struct ieee80211_hdr *hdr;
 144
 145                 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
 146                         return wl->system_hlid;
 147
 148                 hdr = (struct ieee80211_hdr *)skb->data;
 149                 if (ieee80211_is_mgmt(hdr->frame_control))
 150                         return wlvif->ap.global_hlid;
 151                 else
 152                         return wlvif->ap.bcast_hlid;
 153         }
 154 }
 155
 156 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 157                       struct sk_buff *skb)
 158 {
 159         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 160
 161         if (!wlvif || wl12xx_is_dummy_packet(wl, skb))
 162                 return wl->system_hlid;
 163
 164         if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 165                 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb);
 166
 167         if ((test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags) ||
 168              test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags)) &&
 169             !ieee80211_is_auth(hdr->frame_control) &&
 170             !ieee80211_is_assoc_req(hdr->frame_control))
 171                 return wlvif->sta.hlid;
 172         else
 173                 return wlvif->dev_hlid;
 174 }
 175
 176 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
 177                                           unsigned int packet_length)
 178 {
 179         if (wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN)
 180                 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
 181         else
 182                 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
 183 }
 184 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
 185
 186 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 187                               struct sk_buff *skb, u32 extra, u32 buf_offset,
 188                               u8 hlid)
 189 {
 190         struct wl1271_tx_hw_descr *desc;
 191         u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
 192         u32 total_blocks;
 193         int id, ret = -EBUSY, ac;
 194         u32 spare_blocks = wl->normal_tx_spare;
 195         bool is_dummy = false;
 196
 197         if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
 198                 return -EAGAIN;
 199
 200         /* allocate free identifier for the packet */
 201         id = wl1271_alloc_tx_id(wl, skb);
 202         if (id < 0)
 203                 return id;
 204
 205         if (unlikely(wl12xx_is_dummy_packet(wl, skb)))
 206                 is_dummy = true;
 207         else if (wlvif->is_gem)
 208                 spare_blocks = wl->gem_tx_spare;
 209
 210         total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
 211
 212         if (total_blocks <= wl->tx_blocks_available) {
 213                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 214                         skb, total_len - skb->len);
 215
 216                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 217                                              spare_blocks);
 218
 219                 desc->id = id;
 220
 221                 wl->tx_blocks_available -= total_blocks;
 222                 wl->tx_allocated_blocks += total_blocks;
 223
 224                 /* If the FW was empty before, arm the Tx watchdog */
 225                 if (wl->tx_allocated_blocks == total_blocks)
 226                         wl12xx_rearm_tx_watchdog_locked(wl);
 227
 228                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 229                 wl->tx_allocated_pkts[ac]++;
 230
 231                 if (!is_dummy && wlvif &&
 232                     wlvif->bss_type == BSS_TYPE_AP_BSS &&
 233                     test_bit(hlid, wlvif->ap.sta_hlid_map))
 234                         wl->links[hlid].allocated_pkts++;
 235
 236                 ret = 0;
 237
 238                 wl1271_debug(DEBUG_TX,
 239                              "tx_allocate: size: %d, blocks: %d, id: %d",
 240                              total_len, total_blocks, id);
 241         } else {
 242                 wl1271_free_tx_id(wl, id);
 243         }
 244
 245         return ret;
 246 }
 247
 248 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 249                                struct sk_buff *skb, u32 extra,
 250                                struct ieee80211_tx_info *control, u8 hlid)
 251 {
 252         struct timespec ts;
 253         struct wl1271_tx_hw_descr *desc;
 254         int ac, rate_idx;
 255         s64 hosttime;
 256         u16 tx_attr = 0;
 257         __le16 frame_control;
 258         struct ieee80211_hdr *hdr;
 259         u8 *frame_start;
 260         bool is_dummy;
 261
 262         desc = (struct wl1271_tx_hw_descr *) skb->data;
 263         frame_start = (u8 *)(desc + 1);
 264         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 265         frame_control = hdr->frame_control;
 266
 267         /* relocate space for security header */
 268         if (extra) {
 269                 int hdrlen = ieee80211_hdrlen(frame_control);
 270                 memmove(frame_start, hdr, hdrlen);
 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->reserved = 0;
 334         desc->tx_attr = cpu_to_le16(tx_attr);
 335
 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
 350         if (!skb)
 351                 return -EINVAL;
 352
 353         info = IEEE80211_SKB_CB(skb);
 354
 355         /* TODO: handle dummy packets on multi-vifs */
 356         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 357
 358         if (info->control.hw_key &&
 359             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 360                 extra = WL1271_EXTRA_SPACE_TKIP;
 361
 362         if (info->control.hw_key) {
 363                 bool is_wep;
 364                 u8 idx = info->control.hw_key->hw_key_idx;
 365                 u32 cipher = info->control.hw_key->cipher;
 366
 367                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 368                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 369
 370                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 371                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 372                         if (ret < 0)
 373                                 return ret;
 374                         wlvif->default_key = idx;
 375                 }
 376         }
 377         hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 378         if (hlid == WL12XX_INVALID_LINK_ID) {
 379                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 380                 return -EINVAL;
 381         }
 382
 383         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid);
 384         if (ret < 0)
 385                 return ret;
 386
 387         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 388
 389         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 390                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 391                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 392         }
 393
 394         /*
 395          * The length of each packet is stored in terms of
 396          * words. Thus, we must pad the skb data to make sure its
 397          * length is aligned.  The number of padding bytes is computed
 398          * and set in wl1271_tx_fill_hdr.
 399          * In special cases, we want to align to a specific block size
 400          * (eg. for wl128x with SDIO we align to 256).
 401          */
 402         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 403
 404         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 405         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 406
 407         /* Revert side effects in the dummy packet skb, so it can be reused */
 408         if (is_dummy)
 409                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 410
 411         return total_len;
 412 }
 413
 414 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 415                                 enum ieee80211_band rate_band)
 416 {
 417         struct ieee80211_supported_band *band;
 418         u32 enabled_rates = 0;
 419         int bit;
 420
 421         band = wl->hw->wiphy->bands[rate_band];
 422         for (bit = 0; bit < band->n_bitrates; bit++) {
 423                 if (rate_set & 0x1)
 424                         enabled_rates |= band->bitrates[bit].hw_value;
 425                 rate_set >>= 1;
 426         }
 427
 428         /* MCS rates indication are on bits 16 - 23 */
 429         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 430
 431         for (bit = 0; bit < 8; bit++) {
 432                 if (rate_set & 0x1)
 433                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 434                 rate_set >>= 1;
 435         }
 436
 437         return enabled_rates;
 438 }
 439
 440 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 441 {
 442         unsigned long flags;
 443         int i;
 444
 445         for (i = 0; i < NUM_TX_QUEUES; i++) {
 446                 if (test_bit(i, &wl->stopped_queues_map) &&
 447                     wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 448                         /* firmware buffer has space, restart queues */
 449                         spin_lock_irqsave(&wl->wl_lock, flags);
 450                         ieee80211_wake_queue(wl->hw,
 451                                              wl1271_tx_get_mac80211_queue(i));
 452                         clear_bit(i, &wl->stopped_queues_map);
 453                         spin_unlock_irqrestore(&wl->wl_lock, flags);
 454                 }
 455         }
 456 }
 457
 458 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
 459                                                 struct sk_buff_head *queues)
 460 {
 461         int i, q = -1, ac;
 462         u32 min_pkts = 0xffffffff;
 463
 464         /*
 465          * Find a non-empty ac where:
 466          * 1. There are packets to transmit
 467          * 2. The FW has the least allocated blocks
 468          *
 469          * We prioritize the ACs according to VO>VI>BE>BK
 470          */
 471         for (i = 0; i < NUM_TX_QUEUES; i++) {
 472                 ac = wl1271_tx_get_queue(i);
 473                 if (!skb_queue_empty(&queues[ac]) &&
 474                     (wl->tx_allocated_pkts[ac] < min_pkts)) {
 475                         q = ac;
 476                         min_pkts = wl->tx_allocated_pkts[q];
 477                 }
 478         }
 479
 480         if (q == -1)
 481                 return NULL;
 482
 483         return &queues[q];
 484 }
 485
 486 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
 487                                               struct wl1271_link *lnk)
 488 {
 489         struct sk_buff *skb;
 490         unsigned long flags;
 491         struct sk_buff_head *queue;
 492
 493         queue = wl1271_select_queue(wl, lnk->tx_queue);
 494         if (!queue)
 495                 return NULL;
 496
 497         skb = skb_dequeue(queue);
 498         if (skb) {
 499                 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 500                 spin_lock_irqsave(&wl->wl_lock, flags);
 501                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 502                 wl->tx_queue_count[q]--;
 503                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 504         }
 505
 506         return skb;
 507 }
 508
 509 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
 510                                               struct wl12xx_vif *wlvif)
 511 {
 512         struct sk_buff *skb = NULL;
 513         int i, h, start_hlid;
 514
 515         /* start from the link after the last one */
 516         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 517
 518         /* dequeue according to AC, round robin on each link */
 519         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 520                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 521
 522                 /* only consider connected stations */
 523                 if (!test_bit(h, wlvif->links_map))
 524                         continue;
 525
 526                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
 527                 if (!skb)
 528                         continue;
 529
 530                 wlvif->last_tx_hlid = h;
 531                 break;
 532         }
 533
 534         if (!skb)
 535                 wlvif->last_tx_hlid = 0;
 536
 537         return skb;
 538 }
 539
 540 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 541 {
 542         unsigned long flags;
 543         struct wl12xx_vif *wlvif = wl->last_wlvif;
 544         struct sk_buff *skb = NULL;
 545
 546         /* continue from last wlvif (round robin) */
 547         if (wlvif) {
 548                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 549                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 550                         if (skb) {
 551                                 wl->last_wlvif = wlvif;
 552                                 break;
 553                         }
 554                 }
 555         }
 556
 557         /* dequeue from the system HLID before the restarting wlvif list */
 558         if (!skb)
 559                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
 560
 561         /* do a new pass over the wlvif list */
 562         if (!skb) {
 563                 wl12xx_for_each_wlvif(wl, wlvif) {
 564                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 565                         if (skb) {
 566                                 wl->last_wlvif = wlvif;
 567                                 break;
 568                         }
 569
 570                         /*
 571                          * No need to continue after last_wlvif. The previous
 572                          * pass should have found it.
 573                          */
 574                         if (wlvif == wl->last_wlvif)
 575                                 break;
 576                 }
 577         }
 578
 579         if (!skb &&
 580             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 581                 int q;
 582
 583                 skb = wl->dummy_packet;
 584                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 585                 spin_lock_irqsave(&wl->wl_lock, flags);
 586                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 587                 wl->tx_queue_count[q]--;
 588                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 589         }
 590
 591         return skb;
 592 }
 593
 594 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 595                                   struct sk_buff *skb)
 596 {
 597         unsigned long flags;
 598         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 599
 600         if (wl12xx_is_dummy_packet(wl, skb)) {
 601                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 602         } else {
 603                 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 604                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 605
 606                 /* make sure we dequeue the same packet next time */
 607                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 608                                       WL12XX_MAX_LINKS;
 609         }
 610
 611         spin_lock_irqsave(&wl->wl_lock, flags);
 612         wl->tx_queue_count[q]++;
 613         spin_unlock_irqrestore(&wl->wl_lock, flags);
 614 }
 615
 616 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 617 {
 618         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 619
 620         return ieee80211_is_data_present(hdr->frame_control);
 621 }
 622
 623 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 624 {
 625         struct wl12xx_vif *wlvif;
 626         u32 timeout;
 627         u8 hlid;
 628
 629         if (!wl->conf.rx_streaming.interval)
 630                 return;
 631
 632         if (!wl->conf.rx_streaming.always &&
 633             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 634                 return;
 635
 636         timeout = wl->conf.rx_streaming.duration;
 637         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 638                 bool found = false;
 639                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 640                         if (test_bit(hlid, wlvif->links_map)) {
 641                                 found  = true;
 642                                 break;
 643                         }
 644                 }
 645
 646                 if (!found)
 647                         continue;
 648
 649                 /* enable rx streaming */
 650                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 651                         ieee80211_queue_work(wl->hw,
 652                                              &wlvif->rx_streaming_enable_work);
 653
 654                 mod_timer(&wlvif->rx_streaming_timer,
 655                           jiffies + msecs_to_jiffies(timeout));
 656         }
 657 }
 658
 659 void wl1271_tx_work_locked(struct wl1271 *wl)
 660 {
 661         struct wl12xx_vif *wlvif;
 662         struct sk_buff *skb;
 663         struct wl1271_tx_hw_descr *desc;
 664         u32 buf_offset = 0;
 665         bool sent_packets = false;
 666         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 667         int ret;
 668
 669         if (unlikely(wl->state == WL1271_STATE_OFF))
 670                 return;
 671
 672         while ((skb = wl1271_skb_dequeue(wl))) {
 673                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 674                 bool has_data = false;
 675
 676                 wlvif = NULL;
 677                 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
 678                         wlvif = wl12xx_vif_to_data(info->control.vif);
 679
 680                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 681                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
 682                 if (ret == -EAGAIN) {
 683                         /*
 684                          * Aggregation buffer is full.
 685                          * Flush buffer and try again.
 686                          */
 687                         wl1271_skb_queue_head(wl, wlvif, skb);
 688                         wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 689                                           buf_offset, true);
 690                         sent_packets = true;
 691                         buf_offset = 0;
 692                         continue;
 693                 } else if (ret == -EBUSY) {
 694                         /*
 695                          * Firmware buffer is full.
 696                          * Queue back last skb, and stop aggregating.
 697                          */
 698                         wl1271_skb_queue_head(wl, wlvif, skb);
 699                         /* No work left, avoid scheduling redundant tx work */
 700                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 701                         goto out_ack;
 702                 } else if (ret < 0) {
 703                         if (wl12xx_is_dummy_packet(wl, skb))
 704                                 /*
 705                                  * fw still expects dummy packet,
 706                                  * so re-enqueue it
 707                                  */
 708                                 wl1271_skb_queue_head(wl, wlvif, skb);
 709                         else
 710                                 ieee80211_free_txskb(wl->hw, skb);
 711                         goto out_ack;
 712                 }
 713                 buf_offset += ret;
 714                 wl->tx_packets_count++;
 715                 if (has_data) {
 716                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 717                         __set_bit(desc->hlid, active_hlids);
 718                 }
 719         }
 720
 721 out_ack:
 722         if (buf_offset) {
 723                 wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 724                                   buf_offset, true);
 725                 sent_packets = true;
 726         }
 727         if (sent_packets) {
 728                 /*
 729                  * Interrupt the firmware with the new packets. This is only
 730                  * required for older hardware revisions
 731                  */
 732                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION)
 733                         wl1271_write32(wl, WL12XX_HOST_WR_ACCESS,
 734                                        wl->tx_packets_count);
 735
 736                 wl1271_handle_tx_low_watermark(wl);
 737         }
 738         wl12xx_rearm_rx_streaming(wl, active_hlids);
 739 }
 740
 741 void wl1271_tx_work(struct work_struct *work)
 742 {
 743         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 744         int ret;
 745
 746         mutex_lock(&wl->mutex);
 747         ret = wl1271_ps_elp_wakeup(wl);
 748         if (ret < 0)
 749                 goto out;
 750
 751         wl1271_tx_work_locked(wl);
 752
 753         wl1271_ps_elp_sleep(wl);
 754 out:
 755         mutex_unlock(&wl->mutex);
 756 }
 757
 758 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 759 {
 760         u8 flags = 0;
 761
 762         /*
 763          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 764          * only it uses Tx-completion.
 765          */
 766         if (rate_class_index <= 8)
 767                 flags |= IEEE80211_TX_RC_MCS;
 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 == 0)
 774                 flags |= IEEE80211_TX_RC_SHORT_GI;
 775
 776         return flags;
 777 }
 778
 779 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 780                                       struct wl1271_tx_hw_res_descr *result)
 781 {
 782         struct ieee80211_tx_info *info;
 783         struct ieee80211_vif *vif;
 784         struct wl12xx_vif *wlvif;
 785         struct sk_buff *skb;
 786         int id = result->id;
 787         int rate = -1;
 788         u8 rate_flags = 0;
 789         u8 retries = 0;
 790
 791         /* check for id legality */
 792         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 793                 wl1271_warning("TX result illegal id: %d", id);
 794                 return;
 795         }
 796
 797         skb = wl->tx_frames[id];
 798         info = IEEE80211_SKB_CB(skb);
 799
 800         if (wl12xx_is_dummy_packet(wl, skb)) {
 801                 wl1271_free_tx_id(wl, id);
 802                 return;
 803         }
 804
 805         /* info->control is valid as long as we don't update info->status */
 806         vif = info->control.vif;
 807         wlvif = wl12xx_vif_to_data(vif);
 808
 809         /* update the TX status info */
 810         if (result->status == TX_SUCCESS) {
 811                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 812                         info->flags |= IEEE80211_TX_STAT_ACK;
 813                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 814                                           wlvif->band);
 815                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 816                 retries = result->ack_failures;
 817         } else if (result->status == TX_RETRY_EXCEEDED) {
 818                 wl->stats.excessive_retries++;
 819                 retries = result->ack_failures;
 820         }
 821
 822         info->status.rates[0].idx = rate;
 823         info->status.rates[0].count = retries;
 824         info->status.rates[0].flags = rate_flags;
 825         info->status.ack_signal = -1;
 826
 827         wl->stats.retry_count += result->ack_failures;
 828
 829         /*
 830          * update sequence number only when relevant, i.e. only in
 831          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 832          */
 833         if (info->control.hw_key &&
 834             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 835              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 836              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 837                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 838                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 839
 840                 /*
 841                  * update security sequence number, taking care of potential
 842                  * wrap-around
 843                  */
 844                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 845                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 846         }
 847
 848         /* remove private header from packet */
 849         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 850
 851         /* remove TKIP header space if present */
 852         if (info->control.hw_key &&
 853             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 854                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 855                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 856                         hdrlen);
 857                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 858         }
 859
 860         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 861                      " status 0x%x",
 862                      result->id, skb, result->ack_failures,
 863                      result->rate_class_index, result->status);
 864
 865         /* return the packet to the stack */
 866         skb_queue_tail(&wl->deferred_tx_queue, skb);
 867         queue_work(wl->freezable_wq, &wl->netstack_work);
 868         wl1271_free_tx_id(wl, result->id);
 869 }
 870
 871 /* Called upon reception of a TX complete interrupt */
 872 void wl1271_tx_complete(struct wl1271 *wl)
 873 {
 874         struct wl1271_acx_mem_map *memmap =
 875                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 876         u32 count, fw_counter;
 877         u32 i;
 878
 879         /* read the tx results from the chipset */
 880         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 881                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 882         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 883
 884         /* write host counter to chipset (to ack) */
 885         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 886                        offsetof(struct wl1271_tx_hw_res_if,
 887                                 tx_result_host_counter), fw_counter);
 888
 889         count = fw_counter - wl->tx_results_count;
 890         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 891
 892         /* verify that the result buffer is not getting overrun */
 893         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 894                 wl1271_warning("TX result overflow from chipset: %d", count);
 895
 896         /* process the results */
 897         for (i = 0; i < count; i++) {
 898                 struct wl1271_tx_hw_res_descr *result;
 899                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 900
 901                 /* process the packet */
 902                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 903                 wl1271_tx_complete_packet(wl, result);
 904
 905                 wl->tx_results_count++;
 906         }
 907 }
 908 EXPORT_SYMBOL(wl1271_tx_complete);
 909
 910 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 911 {
 912         struct sk_buff *skb;
 913         int i;
 914         unsigned long flags;
 915         struct ieee80211_tx_info *info;
 916         int total[NUM_TX_QUEUES];
 917
 918         for (i = 0; i < NUM_TX_QUEUES; i++) {
 919                 total[i] = 0;
 920                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 921                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 922
 923                         if (!wl12xx_is_dummy_packet(wl, skb)) {
 924                                 info = IEEE80211_SKB_CB(skb);
 925                                 info->status.rates[0].idx = -1;
 926                                 info->status.rates[0].count = 0;
 927                                 ieee80211_tx_status_ni(wl->hw, skb);
 928                         }
 929
 930                         total[i]++;
 931                 }
 932         }
 933
 934         spin_lock_irqsave(&wl->wl_lock, flags);
 935         for (i = 0; i < NUM_TX_QUEUES; i++)
 936                 wl->tx_queue_count[i] -= total[i];
 937         spin_unlock_irqrestore(&wl->wl_lock, flags);
 938
 939         wl1271_handle_tx_low_watermark(wl);
 940 }
 941
 942 /* caller must hold wl->mutex and TX must be stopped */
 943 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 944 {
 945         int i;
 946
 947         /* TX failure */
 948         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
 949                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 950                         wl1271_free_sta(wl, wlvif, i);
 951                 else
 952                         wlvif->sta.ba_rx_bitmap = 0;
 953
 954                 wl->links[i].allocated_pkts = 0;
 955                 wl->links[i].prev_freed_pkts = 0;
 956         }
 957         wlvif->last_tx_hlid = 0;
 958
 959 }
 960 /* caller must hold wl->mutex and TX must be stopped */
 961 void wl12xx_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
 962 {
 963         int i;
 964         struct sk_buff *skb;
 965         struct ieee80211_tx_info *info;
 966
 967         /* only reset the queues if something bad happened */
 968         if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
 969                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
 970                         wl1271_tx_reset_link_queues(wl, i);
 971
 972                 for (i = 0; i < NUM_TX_QUEUES; i++)
 973                         wl->tx_queue_count[i] = 0;
 974         }
 975
 976         wl->stopped_queues_map = 0;
 977
 978         /*
 979          * Make sure the driver is at a consistent state, in case this
 980          * function is called from a context other than interface removal.
 981          * This call will always wake the TX queues.
 982          */
 983         if (reset_tx_queues)
 984                 wl1271_handle_tx_low_watermark(wl);
 985
 986         for (i = 0; i < wl->num_tx_desc; i++) {
 987                 if (wl->tx_frames[i] == NULL)
 988                         continue;
 989
 990                 skb = wl->tx_frames[i];
 991                 wl1271_free_tx_id(wl, i);
 992                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
 993
 994                 if (!wl12xx_is_dummy_packet(wl, skb)) {
 995                         /*
 996                          * Remove private headers before passing the skb to
 997                          * mac80211
 998                          */
 999                         info = IEEE80211_SKB_CB(skb);
1000                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1001                         if (info->control.hw_key &&
1002                             info->control.hw_key->cipher ==
1003                             WLAN_CIPHER_SUITE_TKIP) {
1004                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1005                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1006                                         skb->data, hdrlen);
1007                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1008                         }
1009
1010                         info->status.rates[0].idx = -1;
1011                         info->status.rates[0].count = 0;
1012
1013                         ieee80211_tx_status_ni(wl->hw, skb);
1014                 }
1015         }
1016 }
1017
1018 #define WL1271_TX_FLUSH_TIMEOUT 500000
1019
1020 /* caller must *NOT* hold wl->mutex */
1021 void wl1271_tx_flush(struct wl1271 *wl)
1022 {
1023         unsigned long timeout;
1024         int i;
1025         timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1026
1027         while (!time_after(jiffies, timeout)) {
1028                 mutex_lock(&wl->mutex);
1029                 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
1030                              wl->tx_frames_cnt,
1031                              wl1271_tx_total_queue_count(wl));
1032                 if ((wl->tx_frames_cnt == 0) &&
1033                     (wl1271_tx_total_queue_count(wl) == 0)) {
1034                         mutex_unlock(&wl->mutex);
1035                         return;
1036                 }
1037                 mutex_unlock(&wl->mutex);
1038                 msleep(1);
1039         }
1040
1041         wl1271_warning("Unable to flush all TX buffers, timed out.");
1042
1043         /* forcibly flush all Tx buffers on our queues */
1044         mutex_lock(&wl->mutex);
1045         for (i = 0; i < WL12XX_MAX_LINKS; i++)
1046                 wl1271_tx_reset_link_queues(wl, i);
1047         mutex_unlock(&wl->mutex);
1048 }
1049
1050 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1051 {
1052         if (WARN_ON(!rate_set))
1053                 return 0;
1054
1055         return BIT(__ffs(rate_set));
1056 }