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 (ieee80211_is_mgmt(hdr->frame_control))
 152                         return wlvif->ap.global_hlid;
 153                 else
 154                         return wlvif->ap.bcast_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_BLOCKSIZE_ALIGN)
 182                 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
 183         else
 184                 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
 185 }
 186 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
 187
 188 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 189                               struct sk_buff *skb, u32 extra, u32 buf_offset,
 190                               u8 hlid)
 191 {
 192         struct wl1271_tx_hw_descr *desc;
 193         u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
 194         u32 total_blocks;
 195         int id, ret = -EBUSY, ac;
 196         u32 spare_blocks = wl->normal_tx_spare;
 197         bool is_dummy = false;
 198
 199         if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
 200                 return -EAGAIN;
 201
 202         /* allocate free identifier for the packet */
 203         id = wl1271_alloc_tx_id(wl, skb);
 204         if (id < 0)
 205                 return id;
 206
 207         if (unlikely(wl12xx_is_dummy_packet(wl, skb)))
 208                 is_dummy = true;
 209         else if (wlvif->is_gem)
 210                 spare_blocks = wl->gem_tx_spare;
 211
 212         total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
 213
 214         if (total_blocks <= wl->tx_blocks_available) {
 215                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 216                         skb, total_len - skb->len);
 217
 218                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 219                                              spare_blocks);
 220
 221                 desc->id = id;
 222
 223                 wl->tx_blocks_available -= total_blocks;
 224                 wl->tx_allocated_blocks += total_blocks;
 225
 226                 /* If the FW was empty before, arm the Tx watchdog */
 227                 if (wl->tx_allocated_blocks == total_blocks)
 228                         wl12xx_rearm_tx_watchdog_locked(wl);
 229
 230                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 231                 wl->tx_allocated_pkts[ac]++;
 232
 233                 if (!is_dummy && wlvif &&
 234                     wlvif->bss_type == BSS_TYPE_AP_BSS &&
 235                     test_bit(hlid, wlvif->ap.sta_hlid_map))
 236                         wl->links[hlid].allocated_pkts++;
 237
 238                 ret = 0;
 239
 240                 wl1271_debug(DEBUG_TX,
 241                              "tx_allocate: size: %d, blocks: %d, id: %d",
 242                              total_len, total_blocks, id);
 243         } else {
 244                 wl1271_free_tx_id(wl, id);
 245         }
 246
 247         return ret;
 248 }
 249
 250 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 251                                struct sk_buff *skb, u32 extra,
 252                                struct ieee80211_tx_info *control, u8 hlid)
 253 {
 254         struct timespec ts;
 255         struct wl1271_tx_hw_descr *desc;
 256         int ac, rate_idx;
 257         s64 hosttime;
 258         u16 tx_attr = 0;
 259         __le16 frame_control;
 260         struct ieee80211_hdr *hdr;
 261         u8 *frame_start;
 262         bool is_dummy;
 263
 264         desc = (struct wl1271_tx_hw_descr *) skb->data;
 265         frame_start = (u8 *)(desc + 1);
 266         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 267         frame_control = hdr->frame_control;
 268
 269         /* relocate space for security header */
 270         if (extra) {
 271                 int hdrlen = ieee80211_hdrlen(frame_control);
 272                 memmove(frame_start, hdr, hdrlen);
 273                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 274         }
 275
 276         /* configure packet life time */
 277         getnstimeofday(&ts);
 278         hosttime = (timespec_to_ns(&ts) >> 10);
 279         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 280
 281         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 282         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 283                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 284         else
 285                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 286
 287         /* queue */
 288         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 289         desc->tid = skb->priority;
 290
 291         if (is_dummy) {
 292                 /*
 293                  * FW expects the dummy packet to have an invalid session id -
 294                  * any session id that is different than the one set in the join
 295                  */
 296                 tx_attr = (SESSION_COUNTER_INVALID <<
 297                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 298                            TX_HW_ATTR_SESSION_COUNTER;
 299
 300                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 301         } else if (wlvif) {
 302                 /* configure the tx attributes */
 303                 tx_attr = wlvif->session_counter <<
 304                           TX_HW_ATTR_OFST_SESSION_COUNTER;
 305         }
 306
 307         desc->hlid = hlid;
 308         if (is_dummy || !wlvif)
 309                 rate_idx = 0;
 310         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 311                 /* if the packets are destined for AP (have a STA entry)
 312                    send them with AP rate policies, otherwise use default
 313                    basic rates */
 314                 if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 315                         rate_idx = wlvif->sta.p2p_rate_idx;
 316                 else if (control->control.sta)
 317                         rate_idx = wlvif->sta.ap_rate_idx;
 318                 else
 319                         rate_idx = wlvif->sta.basic_rate_idx;
 320         } else {
 321                 if (hlid == wlvif->ap.global_hlid)
 322                         rate_idx = wlvif->ap.mgmt_rate_idx;
 323                 else if (hlid == wlvif->ap.bcast_hlid)
 324                         rate_idx = wlvif->ap.bcast_rate_idx;
 325                 else
 326                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 327         }
 328
 329         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 330
 331         /* for WEP shared auth - no fw encryption is needed */
 332         if (ieee80211_is_auth(frame_control) &&
 333             ieee80211_has_protected(frame_control))
 334                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 335
 336         desc->tx_attr = cpu_to_le16(tx_attr);
 337
 338         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 339         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 340 }
 341
 342 /* caller must hold wl->mutex */
 343 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 344                                    struct sk_buff *skb, u32 buf_offset)
 345 {
 346         struct ieee80211_tx_info *info;
 347         u32 extra = 0;
 348         int ret = 0;
 349         u32 total_len;
 350         u8 hlid;
 351         bool is_dummy;
 352
 353         if (!skb)
 354                 return -EINVAL;
 355
 356         info = IEEE80211_SKB_CB(skb);
 357
 358         /* TODO: handle dummy packets on multi-vifs */
 359         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 360
 361         if (info->control.hw_key &&
 362             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 363                 extra = WL1271_EXTRA_SPACE_TKIP;
 364
 365         if (info->control.hw_key) {
 366                 bool is_wep;
 367                 u8 idx = info->control.hw_key->hw_key_idx;
 368                 u32 cipher = info->control.hw_key->cipher;
 369
 370                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 371                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 372
 373                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 374                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 375                         if (ret < 0)
 376                                 return ret;
 377                         wlvif->default_key = idx;
 378                 }
 379         }
 380         hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 381         if (hlid == WL12XX_INVALID_LINK_ID) {
 382                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 383                 return -EINVAL;
 384         }
 385
 386         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid);
 387         if (ret < 0)
 388                 return ret;
 389
 390         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 391
 392         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 393                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 394                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 395         }
 396
 397         /*
 398          * The length of each packet is stored in terms of
 399          * words. Thus, we must pad the skb data to make sure its
 400          * length is aligned.  The number of padding bytes is computed
 401          * and set in wl1271_tx_fill_hdr.
 402          * In special cases, we want to align to a specific block size
 403          * (eg. for wl128x with SDIO we align to 256).
 404          */
 405         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 406
 407         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 408         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 409
 410         /* Revert side effects in the dummy packet skb, so it can be reused */
 411         if (is_dummy)
 412                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 413
 414         return total_len;
 415 }
 416
 417 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 418                                 enum ieee80211_band rate_band)
 419 {
 420         struct ieee80211_supported_band *band;
 421         u32 enabled_rates = 0;
 422         int bit;
 423
 424         band = wl->hw->wiphy->bands[rate_band];
 425         for (bit = 0; bit < band->n_bitrates; bit++) {
 426                 if (rate_set & 0x1)
 427                         enabled_rates |= band->bitrates[bit].hw_value;
 428                 rate_set >>= 1;
 429         }
 430
 431         /* MCS rates indication are on bits 16 - 23 */
 432         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 433
 434         for (bit = 0; bit < 8; bit++) {
 435                 if (rate_set & 0x1)
 436                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 437                 rate_set >>= 1;
 438         }
 439
 440         return enabled_rates;
 441 }
 442
 443 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 444 {
 445         unsigned long flags;
 446         int i;
 447
 448         for (i = 0; i < NUM_TX_QUEUES; i++) {
 449                 if (test_bit(i, &wl->stopped_queues_map) &&
 450                     wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 451                         /* firmware buffer has space, restart queues */
 452                         spin_lock_irqsave(&wl->wl_lock, flags);
 453                         ieee80211_wake_queue(wl->hw,
 454                                              wl1271_tx_get_mac80211_queue(i));
 455                         clear_bit(i, &wl->stopped_queues_map);
 456                         spin_unlock_irqrestore(&wl->wl_lock, flags);
 457                 }
 458         }
 459 }
 460
 461 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
 462                                                 struct sk_buff_head *queues)
 463 {
 464         int i, q = -1, ac;
 465         u32 min_pkts = 0xffffffff;
 466
 467         /*
 468          * Find a non-empty ac where:
 469          * 1. There are packets to transmit
 470          * 2. The FW has the least allocated blocks
 471          *
 472          * We prioritize the ACs according to VO>VI>BE>BK
 473          */
 474         for (i = 0; i < NUM_TX_QUEUES; i++) {
 475                 ac = wl1271_tx_get_queue(i);
 476                 if (!skb_queue_empty(&queues[ac]) &&
 477                     (wl->tx_allocated_pkts[ac] < min_pkts)) {
 478                         q = ac;
 479                         min_pkts = wl->tx_allocated_pkts[q];
 480                 }
 481         }
 482
 483         if (q == -1)
 484                 return NULL;
 485
 486         return &queues[q];
 487 }
 488
 489 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
 490                                               struct wl1271_link *lnk)
 491 {
 492         struct sk_buff *skb;
 493         unsigned long flags;
 494         struct sk_buff_head *queue;
 495
 496         queue = wl1271_select_queue(wl, lnk->tx_queue);
 497         if (!queue)
 498                 return NULL;
 499
 500         skb = skb_dequeue(queue);
 501         if (skb) {
 502                 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 503                 spin_lock_irqsave(&wl->wl_lock, flags);
 504                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 505                 wl->tx_queue_count[q]--;
 506                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 507         }
 508
 509         return skb;
 510 }
 511
 512 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
 513                                               struct wl12xx_vif *wlvif)
 514 {
 515         struct sk_buff *skb = NULL;
 516         int i, h, start_hlid;
 517
 518         /* start from the link after the last one */
 519         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 520
 521         /* dequeue according to AC, round robin on each link */
 522         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 523                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 524
 525                 /* only consider connected stations */
 526                 if (!test_bit(h, wlvif->links_map))
 527                         continue;
 528
 529                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
 530                 if (!skb)
 531                         continue;
 532
 533                 wlvif->last_tx_hlid = h;
 534                 break;
 535         }
 536
 537         if (!skb)
 538                 wlvif->last_tx_hlid = 0;
 539
 540         return skb;
 541 }
 542
 543 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 544 {
 545         unsigned long flags;
 546         struct wl12xx_vif *wlvif = wl->last_wlvif;
 547         struct sk_buff *skb = NULL;
 548
 549         /* continue from last wlvif (round robin) */
 550         if (wlvif) {
 551                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 552                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 553                         if (skb) {
 554                                 wl->last_wlvif = wlvif;
 555                                 break;
 556                         }
 557                 }
 558         }
 559
 560         /* dequeue from the system HLID before the restarting wlvif list */
 561         if (!skb)
 562                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
 563
 564         /* do a new pass over the wlvif list */
 565         if (!skb) {
 566                 wl12xx_for_each_wlvif(wl, wlvif) {
 567                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 568                         if (skb) {
 569                                 wl->last_wlvif = wlvif;
 570                                 break;
 571                         }
 572
 573                         /*
 574                          * No need to continue after last_wlvif. The previous
 575                          * pass should have found it.
 576                          */
 577                         if (wlvif == wl->last_wlvif)
 578                                 break;
 579                 }
 580         }
 581
 582         if (!skb &&
 583             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 584                 int q;
 585
 586                 skb = wl->dummy_packet;
 587                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 588                 spin_lock_irqsave(&wl->wl_lock, flags);
 589                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 590                 wl->tx_queue_count[q]--;
 591                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 592         }
 593
 594         return skb;
 595 }
 596
 597 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 598                                   struct sk_buff *skb)
 599 {
 600         unsigned long flags;
 601         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 602
 603         if (wl12xx_is_dummy_packet(wl, skb)) {
 604                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 605         } else {
 606                 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 607                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 608
 609                 /* make sure we dequeue the same packet next time */
 610                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 611                                       WL12XX_MAX_LINKS;
 612         }
 613
 614         spin_lock_irqsave(&wl->wl_lock, flags);
 615         wl->tx_queue_count[q]++;
 616         spin_unlock_irqrestore(&wl->wl_lock, flags);
 617 }
 618
 619 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 620 {
 621         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 622
 623         return ieee80211_is_data_present(hdr->frame_control);
 624 }
 625
 626 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 627 {
 628         struct wl12xx_vif *wlvif;
 629         u32 timeout;
 630         u8 hlid;
 631
 632         if (!wl->conf.rx_streaming.interval)
 633                 return;
 634
 635         if (!wl->conf.rx_streaming.always &&
 636             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 637                 return;
 638
 639         timeout = wl->conf.rx_streaming.duration;
 640         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 641                 bool found = false;
 642                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 643                         if (test_bit(hlid, wlvif->links_map)) {
 644                                 found  = true;
 645                                 break;
 646                         }
 647                 }
 648
 649                 if (!found)
 650                         continue;
 651
 652                 /* enable rx streaming */
 653                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 654                         ieee80211_queue_work(wl->hw,
 655                                              &wlvif->rx_streaming_enable_work);
 656
 657                 mod_timer(&wlvif->rx_streaming_timer,
 658                           jiffies + msecs_to_jiffies(timeout));
 659         }
 660 }
 661
 662 void wl1271_tx_work_locked(struct wl1271 *wl)
 663 {
 664         struct wl12xx_vif *wlvif;
 665         struct sk_buff *skb;
 666         struct wl1271_tx_hw_descr *desc;
 667         u32 buf_offset = 0;
 668         bool sent_packets = false;
 669         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 670         int ret;
 671
 672         if (unlikely(wl->state == WL1271_STATE_OFF))
 673                 return;
 674
 675         while ((skb = wl1271_skb_dequeue(wl))) {
 676                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 677                 bool has_data = false;
 678
 679                 wlvif = NULL;
 680                 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
 681                         wlvif = wl12xx_vif_to_data(info->control.vif);
 682
 683                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 684                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
 685                 if (ret == -EAGAIN) {
 686                         /*
 687                          * Aggregation buffer is full.
 688                          * Flush buffer and try again.
 689                          */
 690                         wl1271_skb_queue_head(wl, wlvif, skb);
 691                         wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 692                                           buf_offset, true);
 693                         sent_packets = true;
 694                         buf_offset = 0;
 695                         continue;
 696                 } else if (ret == -EBUSY) {
 697                         /*
 698                          * Firmware buffer is full.
 699                          * Queue back last skb, and stop aggregating.
 700                          */
 701                         wl1271_skb_queue_head(wl, wlvif, skb);
 702                         /* No work left, avoid scheduling redundant tx work */
 703                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 704                         goto out_ack;
 705                 } else if (ret < 0) {
 706                         if (wl12xx_is_dummy_packet(wl, skb))
 707                                 /*
 708                                  * fw still expects dummy packet,
 709                                  * so re-enqueue it
 710                                  */
 711                                 wl1271_skb_queue_head(wl, wlvif, skb);
 712                         else
 713                                 ieee80211_free_txskb(wl->hw, skb);
 714                         goto out_ack;
 715                 }
 716                 buf_offset += ret;
 717                 wl->tx_packets_count++;
 718                 if (has_data) {
 719                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 720                         __set_bit(desc->hlid, active_hlids);
 721                 }
 722         }
 723
 724 out_ack:
 725         if (buf_offset) {
 726                 wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 727                                   buf_offset, true);
 728                 sent_packets = true;
 729         }
 730         if (sent_packets) {
 731                 /*
 732                  * Interrupt the firmware with the new packets. This is only
 733                  * required for older hardware revisions
 734                  */
 735                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION)
 736                         wl1271_write32(wl, WL12XX_HOST_WR_ACCESS,
 737                                        wl->tx_packets_count);
 738
 739                 wl1271_handle_tx_low_watermark(wl);
 740         }
 741         wl12xx_rearm_rx_streaming(wl, active_hlids);
 742 }
 743
 744 void wl1271_tx_work(struct work_struct *work)
 745 {
 746         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 747         int ret;
 748
 749         mutex_lock(&wl->mutex);
 750         ret = wl1271_ps_elp_wakeup(wl);
 751         if (ret < 0)
 752                 goto out;
 753
 754         wl1271_tx_work_locked(wl);
 755
 756         wl1271_ps_elp_sleep(wl);
 757 out:
 758         mutex_unlock(&wl->mutex);
 759 }
 760
 761 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 762 {
 763         u8 flags = 0;
 764
 765         /*
 766          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 767          * only it uses Tx-completion.
 768          */
 769         if (rate_class_index <= 8)
 770                 flags |= IEEE80211_TX_RC_MCS;
 771
 772         /*
 773          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 774          * only it uses Tx-completion.
 775          */
 776         if (rate_class_index == 0)
 777                 flags |= IEEE80211_TX_RC_SHORT_GI;
 778
 779         return flags;
 780 }
 781
 782 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 783                                       struct wl1271_tx_hw_res_descr *result)
 784 {
 785         struct ieee80211_tx_info *info;
 786         struct ieee80211_vif *vif;
 787         struct wl12xx_vif *wlvif;
 788         struct sk_buff *skb;
 789         int id = result->id;
 790         int rate = -1;
 791         u8 rate_flags = 0;
 792         u8 retries = 0;
 793
 794         /* check for id legality */
 795         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 796                 wl1271_warning("TX result illegal id: %d", id);
 797                 return;
 798         }
 799
 800         skb = wl->tx_frames[id];
 801         info = IEEE80211_SKB_CB(skb);
 802
 803         if (wl12xx_is_dummy_packet(wl, skb)) {
 804                 wl1271_free_tx_id(wl, id);
 805                 return;
 806         }
 807
 808         /* info->control is valid as long as we don't update info->status */
 809         vif = info->control.vif;
 810         wlvif = wl12xx_vif_to_data(vif);
 811
 812         /* update the TX status info */
 813         if (result->status == TX_SUCCESS) {
 814                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 815                         info->flags |= IEEE80211_TX_STAT_ACK;
 816                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 817                                           wlvif->band);
 818                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 819                 retries = result->ack_failures;
 820         } else if (result->status == TX_RETRY_EXCEEDED) {
 821                 wl->stats.excessive_retries++;
 822                 retries = result->ack_failures;
 823         }
 824
 825         info->status.rates[0].idx = rate;
 826         info->status.rates[0].count = retries;
 827         info->status.rates[0].flags = rate_flags;
 828         info->status.ack_signal = -1;
 829
 830         wl->stats.retry_count += result->ack_failures;
 831
 832         /*
 833          * update sequence number only when relevant, i.e. only in
 834          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 835          */
 836         if (info->control.hw_key &&
 837             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 838              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 839              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 840                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 841                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 842
 843                 /*
 844                  * update security sequence number, taking care of potential
 845                  * wrap-around
 846                  */
 847                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 848                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 849         }
 850
 851         /* remove private header from packet */
 852         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 853
 854         /* remove TKIP header space if present */
 855         if (info->control.hw_key &&
 856             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 857                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 858                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 859                         hdrlen);
 860                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 861         }
 862
 863         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 864                      " status 0x%x",
 865                      result->id, skb, result->ack_failures,
 866                      result->rate_class_index, result->status);
 867
 868         /* return the packet to the stack */
 869         skb_queue_tail(&wl->deferred_tx_queue, skb);
 870         queue_work(wl->freezable_wq, &wl->netstack_work);
 871         wl1271_free_tx_id(wl, result->id);
 872 }
 873
 874 /* Called upon reception of a TX complete interrupt */
 875 void wl1271_tx_complete(struct wl1271 *wl)
 876 {
 877         struct wl1271_acx_mem_map *memmap =
 878                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 879         u32 count, fw_counter;
 880         u32 i;
 881
 882         /* read the tx results from the chipset */
 883         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 884                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 885         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 886
 887         /* write host counter to chipset (to ack) */
 888         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 889                        offsetof(struct wl1271_tx_hw_res_if,
 890                                 tx_result_host_counter), fw_counter);
 891
 892         count = fw_counter - wl->tx_results_count;
 893         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 894
 895         /* verify that the result buffer is not getting overrun */
 896         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 897                 wl1271_warning("TX result overflow from chipset: %d", count);
 898
 899         /* process the results */
 900         for (i = 0; i < count; i++) {
 901                 struct wl1271_tx_hw_res_descr *result;
 902                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 903
 904                 /* process the packet */
 905                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 906                 wl1271_tx_complete_packet(wl, result);
 907
 908                 wl->tx_results_count++;
 909         }
 910 }
 911 EXPORT_SYMBOL(wl1271_tx_complete);
 912
 913 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 914 {
 915         struct sk_buff *skb;
 916         int i;
 917         unsigned long flags;
 918         struct ieee80211_tx_info *info;
 919         int total[NUM_TX_QUEUES];
 920
 921         for (i = 0; i < NUM_TX_QUEUES; i++) {
 922                 total[i] = 0;
 923                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 924                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 925
 926                         if (!wl12xx_is_dummy_packet(wl, skb)) {
 927                                 info = IEEE80211_SKB_CB(skb);
 928                                 info->status.rates[0].idx = -1;
 929                                 info->status.rates[0].count = 0;
 930                                 ieee80211_tx_status_ni(wl->hw, skb);
 931                         }
 932
 933                         total[i]++;
 934                 }
 935         }
 936
 937         spin_lock_irqsave(&wl->wl_lock, flags);
 938         for (i = 0; i < NUM_TX_QUEUES; i++)
 939                 wl->tx_queue_count[i] -= total[i];
 940         spin_unlock_irqrestore(&wl->wl_lock, flags);
 941
 942         wl1271_handle_tx_low_watermark(wl);
 943 }
 944
 945 /* caller must hold wl->mutex and TX must be stopped */
 946 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 947 {
 948         int i;
 949
 950         /* TX failure */
 951         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
 952                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 953                         wl1271_free_sta(wl, wlvif, i);
 954                 else
 955                         wlvif->sta.ba_rx_bitmap = 0;
 956
 957                 wl->links[i].allocated_pkts = 0;
 958                 wl->links[i].prev_freed_pkts = 0;
 959         }
 960         wlvif->last_tx_hlid = 0;
 961
 962 }
 963 /* caller must hold wl->mutex and TX must be stopped */
 964 void wl12xx_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
 965 {
 966         int i;
 967         struct sk_buff *skb;
 968         struct ieee80211_tx_info *info;
 969
 970         /* only reset the queues if something bad happened */
 971         if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
 972                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
 973                         wl1271_tx_reset_link_queues(wl, i);
 974
 975                 for (i = 0; i < NUM_TX_QUEUES; i++)
 976                         wl->tx_queue_count[i] = 0;
 977         }
 978
 979         wl->stopped_queues_map = 0;
 980
 981         /*
 982          * Make sure the driver is at a consistent state, in case this
 983          * function is called from a context other than interface removal.
 984          * This call will always wake the TX queues.
 985          */
 986         if (reset_tx_queues)
 987                 wl1271_handle_tx_low_watermark(wl);
 988
 989         for (i = 0; i < wl->num_tx_desc; i++) {
 990                 if (wl->tx_frames[i] == NULL)
 991                         continue;
 992
 993                 skb = wl->tx_frames[i];
 994                 wl1271_free_tx_id(wl, i);
 995                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
 996
 997                 if (!wl12xx_is_dummy_packet(wl, skb)) {
 998                         /*
 999                          * Remove private headers before passing the skb to
1000                          * mac80211
1001                          */
1002                         info = IEEE80211_SKB_CB(skb);
1003                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1004                         if (info->control.hw_key &&
1005                             info->control.hw_key->cipher ==
1006                             WLAN_CIPHER_SUITE_TKIP) {
1007                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1008                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1009                                         skb->data, hdrlen);
1010                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1011                         }
1012
1013                         info->status.rates[0].idx = -1;
1014                         info->status.rates[0].count = 0;
1015
1016                         ieee80211_tx_status_ni(wl->hw, skb);
1017                 }
1018         }
1019 }
1020
1021 #define WL1271_TX_FLUSH_TIMEOUT 500000
1022
1023 /* caller must *NOT* hold wl->mutex */
1024 void wl1271_tx_flush(struct wl1271 *wl)
1025 {
1026         unsigned long timeout;
1027         int i;
1028         timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1029
1030         while (!time_after(jiffies, timeout)) {
1031                 mutex_lock(&wl->mutex);
1032                 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
1033                              wl->tx_frames_cnt,
1034                              wl1271_tx_total_queue_count(wl));
1035                 if ((wl->tx_frames_cnt == 0) &&
1036                     (wl1271_tx_total_queue_count(wl) == 0)) {
1037                         mutex_unlock(&wl->mutex);
1038                         return;
1039                 }
1040                 mutex_unlock(&wl->mutex);
1041                 msleep(1);
1042         }
1043
1044         wl1271_warning("Unable to flush all TX buffers, timed out.");
1045
1046         /* forcibly flush all Tx buffers on our queues */
1047         mutex_lock(&wl->mutex);
1048         for (i = 0; i < WL12XX_MAX_LINKS; i++)
1049                 wl1271_tx_reset_link_queues(wl, i);
1050         mutex_unlock(&wl->mutex);
1051 }
1052
1053 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1054 {
1055         if (WARN_ON(!rate_set))
1056                 return 0;
1057
1058         return BIT(__ffs(rate_set));
1059 }