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_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, bool is_gem)
 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;
 197
 198         if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
 199                 return -EAGAIN;
 200
 201         spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
 202
 203         /* allocate free identifier for the packet */
 204         id = wl1271_alloc_tx_id(wl, skb);
 205         if (id < 0)
 206                 return id;
 207
 208         total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
 209
 210         if (total_blocks <= wl->tx_blocks_available) {
 211                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 212                         skb, total_len - skb->len);
 213
 214                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 215                                              spare_blocks);
 216
 217                 desc->id = id;
 218
 219                 wl->tx_blocks_available -= total_blocks;
 220                 wl->tx_allocated_blocks += total_blocks;
 221
 222                 /* If the FW was empty before, arm the Tx watchdog */
 223                 if (wl->tx_allocated_blocks == total_blocks)
 224                         wl12xx_rearm_tx_watchdog_locked(wl);
 225
 226                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 227                 wl->tx_allocated_pkts[ac]++;
 228
 229                 if (!wl12xx_is_dummy_packet(wl, skb) && wlvif &&
 230                     wlvif->bss_type == BSS_TYPE_AP_BSS &&
 231                     test_bit(hlid, wlvif->ap.sta_hlid_map))
 232                         wl->links[hlid].allocated_pkts++;
 233
 234                 ret = 0;
 235
 236                 wl1271_debug(DEBUG_TX,
 237                              "tx_allocate: size: %d, blocks: %d, id: %d",
 238                              total_len, total_blocks, id);
 239         } else {
 240                 wl1271_free_tx_id(wl, id);
 241         }
 242
 243         return ret;
 244 }
 245
 246 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 247                                struct sk_buff *skb, u32 extra,
 248                                struct ieee80211_tx_info *control, u8 hlid)
 249 {
 250         struct timespec ts;
 251         struct wl1271_tx_hw_descr *desc;
 252         int ac, rate_idx;
 253         s64 hosttime;
 254         u16 tx_attr = 0;
 255         __le16 frame_control;
 256         struct ieee80211_hdr *hdr;
 257         u8 *frame_start;
 258         bool is_dummy;
 259
 260         desc = (struct wl1271_tx_hw_descr *) skb->data;
 261         frame_start = (u8 *)(desc + 1);
 262         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 263         frame_control = hdr->frame_control;
 264
 265         /* relocate space for security header */
 266         if (extra) {
 267                 int hdrlen = ieee80211_hdrlen(frame_control);
 268                 memmove(frame_start, hdr, hdrlen);
 269                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 270         }
 271
 272         /* configure packet life time */
 273         getnstimeofday(&ts);
 274         hosttime = (timespec_to_ns(&ts) >> 10);
 275         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 276
 277         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 278         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 279                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 280         else
 281                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 282
 283         /* queue */
 284         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 285         desc->tid = skb->priority;
 286
 287         if (is_dummy) {
 288                 /*
 289                  * FW expects the dummy packet to have an invalid session id -
 290                  * any session id that is different than the one set in the join
 291                  */
 292                 tx_attr = (SESSION_COUNTER_INVALID <<
 293                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 294                            TX_HW_ATTR_SESSION_COUNTER;
 295
 296                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 297         } else if (wlvif) {
 298                 /* configure the tx attributes */
 299                 tx_attr = wlvif->session_counter <<
 300                           TX_HW_ATTR_OFST_SESSION_COUNTER;
 301         }
 302
 303         desc->hlid = hlid;
 304         if (is_dummy || !wlvif)
 305                 rate_idx = 0;
 306         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 307                 /* if the packets are destined for AP (have a STA entry)
 308                    send them with AP rate policies, otherwise use default
 309                    basic rates */
 310                 if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 311                         rate_idx = wlvif->sta.p2p_rate_idx;
 312                 else if (control->control.sta)
 313                         rate_idx = wlvif->sta.ap_rate_idx;
 314                 else
 315                         rate_idx = wlvif->sta.basic_rate_idx;
 316         } else {
 317                 if (hlid == wlvif->ap.global_hlid)
 318                         rate_idx = wlvif->ap.mgmt_rate_idx;
 319                 else if (hlid == wlvif->ap.bcast_hlid)
 320                         rate_idx = wlvif->ap.bcast_rate_idx;
 321                 else
 322                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 323         }
 324
 325         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 326
 327         /* for WEP shared auth - no fw encryption is needed */
 328         if (ieee80211_is_auth(frame_control) &&
 329             ieee80211_has_protected(frame_control))
 330                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 331
 332         desc->tx_attr = cpu_to_le16(tx_attr);
 333
 334         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 335         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 336 }
 337
 338 /* caller must hold wl->mutex */
 339 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 340                                    struct sk_buff *skb, u32 buf_offset)
 341 {
 342         struct ieee80211_tx_info *info;
 343         u32 extra = 0;
 344         int ret = 0;
 345         u32 total_len;
 346         u8 hlid;
 347         bool is_dummy;
 348         bool is_gem = false;
 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 ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 359             info->control.hw_key &&
 360             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 361                 extra = WL1271_EXTRA_SPACE_TKIP;
 362
 363         if (info->control.hw_key) {
 364                 bool is_wep;
 365                 u8 idx = info->control.hw_key->hw_key_idx;
 366                 u32 cipher = info->control.hw_key->cipher;
 367
 368                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 369                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 370
 371                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 372                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 373                         if (ret < 0)
 374                                 return ret;
 375                         wlvif->default_key = idx;
 376                 }
 377
 378                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 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                                  is_gem);
 388         if (ret < 0)
 389                 return ret;
 390
 391         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 392
 393         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 394                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 395                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 396         }
 397
 398         /*
 399          * The length of each packet is stored in terms of
 400          * words. Thus, we must pad the skb data to make sure its
 401          * length is aligned.  The number of padding bytes is computed
 402          * and set in wl1271_tx_fill_hdr.
 403          * In special cases, we want to align to a specific block size
 404          * (eg. for wl128x with SDIO we align to 256).
 405          */
 406         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 407
 408         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 409         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 410
 411         /* Revert side effects in the dummy packet skb, so it can be reused */
 412         if (is_dummy)
 413                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 414
 415         return total_len;
 416 }
 417
 418 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 419                                 enum ieee80211_band rate_band)
 420 {
 421         struct ieee80211_supported_band *band;
 422         u32 enabled_rates = 0;
 423         int bit;
 424
 425         band = wl->hw->wiphy->bands[rate_band];
 426         for (bit = 0; bit < band->n_bitrates; bit++) {
 427                 if (rate_set & 0x1)
 428                         enabled_rates |= band->bitrates[bit].hw_value;
 429                 rate_set >>= 1;
 430         }
 431
 432         /* MCS rates indication are on bits 16 - 31 */
 433         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 434
 435         for (bit = 0; bit < 16; bit++) {
 436                 if (rate_set & 0x1)
 437                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 438                 rate_set >>= 1;
 439         }
 440
 441         return enabled_rates;
 442 }
 443
 444 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 445 {
 446         int i;
 447
 448         for (i = 0; i < NUM_TX_QUEUES; i++) {
 449                 if (wlcore_is_queue_stopped_by_reason(wl, i,
 450                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 451                     wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 452                         /* firmware buffer has space, restart queues */
 453                         wlcore_wake_queue(wl, i,
 454                                           WLCORE_QUEUE_STOP_REASON_WATERMARK);
 455                 }
 456         }
 457 }
 458
 459 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
 460                                                 struct sk_buff_head *queues)
 461 {
 462         int i, q = -1, ac;
 463         u32 min_pkts = 0xffffffff;
 464
 465         /*
 466          * Find a non-empty ac where:
 467          * 1. There are packets to transmit
 468          * 2. The FW has the least allocated blocks
 469          *
 470          * We prioritize the ACs according to VO>VI>BE>BK
 471          */
 472         for (i = 0; i < NUM_TX_QUEUES; i++) {
 473                 ac = wl1271_tx_get_queue(i);
 474                 if (!skb_queue_empty(&queues[ac]) &&
 475                     (wl->tx_allocated_pkts[ac] < min_pkts)) {
 476                         q = ac;
 477                         min_pkts = wl->tx_allocated_pkts[q];
 478                 }
 479         }
 480
 481         if (q == -1)
 482                 return NULL;
 483
 484         return &queues[q];
 485 }
 486
 487 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
 488                                               struct wl1271_link *lnk)
 489 {
 490         struct sk_buff *skb;
 491         unsigned long flags;
 492         struct sk_buff_head *queue;
 493
 494         queue = wl1271_select_queue(wl, lnk->tx_queue);
 495         if (!queue)
 496                 return NULL;
 497
 498         skb = skb_dequeue(queue);
 499         if (skb) {
 500                 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 501                 spin_lock_irqsave(&wl->wl_lock, flags);
 502                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 503                 wl->tx_queue_count[q]--;
 504                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 505         }
 506
 507         return skb;
 508 }
 509
 510 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
 511                                               struct wl12xx_vif *wlvif)
 512 {
 513         struct sk_buff *skb = NULL;
 514         int i, h, start_hlid;
 515
 516         /* start from the link after the last one */
 517         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 518
 519         /* dequeue according to AC, round robin on each link */
 520         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 521                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 522
 523                 /* only consider connected stations */
 524                 if (!test_bit(h, wlvif->links_map))
 525                         continue;
 526
 527                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
 528                 if (!skb)
 529                         continue;
 530
 531                 wlvif->last_tx_hlid = h;
 532                 break;
 533         }
 534
 535         if (!skb)
 536                 wlvif->last_tx_hlid = 0;
 537
 538         return skb;
 539 }
 540
 541 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 542 {
 543         unsigned long flags;
 544         struct wl12xx_vif *wlvif = wl->last_wlvif;
 545         struct sk_buff *skb = NULL;
 546
 547         /* continue from last wlvif (round robin) */
 548         if (wlvif) {
 549                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 550                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 551                         if (skb) {
 552                                 wl->last_wlvif = wlvif;
 553                                 break;
 554                         }
 555                 }
 556         }
 557
 558         /* dequeue from the system HLID before the restarting wlvif list */
 559         if (!skb)
 560                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
 561
 562         /* do a new pass over the wlvif list */
 563         if (!skb) {
 564                 wl12xx_for_each_wlvif(wl, wlvif) {
 565                         skb = wl12xx_vif_skb_dequeue(wl, wlvif);
 566                         if (skb) {
 567                                 wl->last_wlvif = wlvif;
 568                                 break;
 569                         }
 570
 571                         /*
 572                          * No need to continue after last_wlvif. The previous
 573                          * pass should have found it.
 574                          */
 575                         if (wlvif == wl->last_wlvif)
 576                                 break;
 577                 }
 578         }
 579
 580         if (!skb &&
 581             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 582                 int q;
 583
 584                 skb = wl->dummy_packet;
 585                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 586                 spin_lock_irqsave(&wl->wl_lock, flags);
 587                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 588                 wl->tx_queue_count[q]--;
 589                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 590         }
 591
 592         return skb;
 593 }
 594
 595 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 596                                   struct sk_buff *skb)
 597 {
 598         unsigned long flags;
 599         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 600
 601         if (wl12xx_is_dummy_packet(wl, skb)) {
 602                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 603         } else {
 604                 u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
 605                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 606
 607                 /* make sure we dequeue the same packet next time */
 608                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 609                                       WL12XX_MAX_LINKS;
 610         }
 611
 612         spin_lock_irqsave(&wl->wl_lock, flags);
 613         wl->tx_queue_count[q]++;
 614         spin_unlock_irqrestore(&wl->wl_lock, flags);
 615 }
 616
 617 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 618 {
 619         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 620
 621         return ieee80211_is_data_present(hdr->frame_control);
 622 }
 623
 624 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 625 {
 626         struct wl12xx_vif *wlvif;
 627         u32 timeout;
 628         u8 hlid;
 629
 630         if (!wl->conf.rx_streaming.interval)
 631                 return;
 632
 633         if (!wl->conf.rx_streaming.always &&
 634             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 635                 return;
 636
 637         timeout = wl->conf.rx_streaming.duration;
 638         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 639                 bool found = false;
 640                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 641                         if (test_bit(hlid, wlvif->links_map)) {
 642                                 found  = true;
 643                                 break;
 644                         }
 645                 }
 646
 647                 if (!found)
 648                         continue;
 649
 650                 /* enable rx streaming */
 651                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 652                         ieee80211_queue_work(wl->hw,
 653                                              &wlvif->rx_streaming_enable_work);
 654
 655                 mod_timer(&wlvif->rx_streaming_timer,
 656                           jiffies + msecs_to_jiffies(timeout));
 657         }
 658 }
 659
 660 void wl1271_tx_work_locked(struct wl1271 *wl)
 661 {
 662         struct wl12xx_vif *wlvif;
 663         struct sk_buff *skb;
 664         struct wl1271_tx_hw_descr *desc;
 665         u32 buf_offset = 0;
 666         bool sent_packets = false;
 667         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 668         int ret;
 669
 670         if (unlikely(wl->state == WL1271_STATE_OFF))
 671                 return;
 672
 673         while ((skb = wl1271_skb_dequeue(wl))) {
 674                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 675                 bool has_data = false;
 676
 677                 wlvif = NULL;
 678                 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
 679                         wlvif = wl12xx_vif_to_data(info->control.vif);
 680
 681                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 682                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
 683                 if (ret == -EAGAIN) {
 684                         /*
 685                          * Aggregation buffer is full.
 686                          * Flush buffer and try again.
 687                          */
 688                         wl1271_skb_queue_head(wl, wlvif, skb);
 689                         wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 690                                           buf_offset, true);
 691                         sent_packets = true;
 692                         buf_offset = 0;
 693                         continue;
 694                 } else if (ret == -EBUSY) {
 695                         /*
 696                          * Firmware buffer is full.
 697                          * Queue back last skb, and stop aggregating.
 698                          */
 699                         wl1271_skb_queue_head(wl, wlvif, skb);
 700                         /* No work left, avoid scheduling redundant tx work */
 701                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 702                         goto out_ack;
 703                 } else if (ret < 0) {
 704                         if (wl12xx_is_dummy_packet(wl, skb))
 705                                 /*
 706                                  * fw still expects dummy packet,
 707                                  * so re-enqueue it
 708                                  */
 709                                 wl1271_skb_queue_head(wl, wlvif, skb);
 710                         else
 711                                 ieee80211_free_txskb(wl->hw, skb);
 712                         goto out_ack;
 713                 }
 714                 buf_offset += ret;
 715                 wl->tx_packets_count++;
 716                 if (has_data) {
 717                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 718                         __set_bit(desc->hlid, active_hlids);
 719                 }
 720         }
 721
 722 out_ack:
 723         if (buf_offset) {
 724                 wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 725                                   buf_offset, true);
 726                 sent_packets = true;
 727         }
 728         if (sent_packets) {
 729                 /*
 730                  * Interrupt the firmware with the new packets. This is only
 731                  * required for older hardware revisions
 732                  */
 733                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION)
 734                         wl1271_write32(wl, WL12XX_HOST_WR_ACCESS,
 735                                        wl->tx_packets_count);
 736
 737                 wl1271_handle_tx_low_watermark(wl);
 738         }
 739         wl12xx_rearm_rx_streaming(wl, active_hlids);
 740 }
 741
 742 void wl1271_tx_work(struct work_struct *work)
 743 {
 744         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 745         int ret;
 746
 747         mutex_lock(&wl->mutex);
 748         ret = wl1271_ps_elp_wakeup(wl);
 749         if (ret < 0)
 750                 goto out;
 751
 752         wl1271_tx_work_locked(wl);
 753
 754         wl1271_ps_elp_sleep(wl);
 755 out:
 756         mutex_unlock(&wl->mutex);
 757 }
 758
 759 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 760 {
 761         u8 flags = 0;
 762
 763         /*
 764          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 765          * only it uses Tx-completion.
 766          */
 767         if (rate_class_index <= 8)
 768                 flags |= IEEE80211_TX_RC_MCS;
 769
 770         /*
 771          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 772          * only it uses Tx-completion.
 773          */
 774         if (rate_class_index == 0)
 775                 flags |= IEEE80211_TX_RC_SHORT_GI;
 776
 777         return flags;
 778 }
 779
 780 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 781                                       struct wl1271_tx_hw_res_descr *result)
 782 {
 783         struct ieee80211_tx_info *info;
 784         struct ieee80211_vif *vif;
 785         struct wl12xx_vif *wlvif;
 786         struct sk_buff *skb;
 787         int id = result->id;
 788         int rate = -1;
 789         u8 rate_flags = 0;
 790         u8 retries = 0;
 791
 792         /* check for id legality */
 793         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 794                 wl1271_warning("TX result illegal id: %d", id);
 795                 return;
 796         }
 797
 798         skb = wl->tx_frames[id];
 799         info = IEEE80211_SKB_CB(skb);
 800
 801         if (wl12xx_is_dummy_packet(wl, skb)) {
 802                 wl1271_free_tx_id(wl, id);
 803                 return;
 804         }
 805
 806         /* info->control is valid as long as we don't update info->status */
 807         vif = info->control.vif;
 808         wlvif = wl12xx_vif_to_data(vif);
 809
 810         /* update the TX status info */
 811         if (result->status == TX_SUCCESS) {
 812                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 813                         info->flags |= IEEE80211_TX_STAT_ACK;
 814                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 815                                           wlvif->band);
 816                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 817                 retries = result->ack_failures;
 818         } else if (result->status == TX_RETRY_EXCEEDED) {
 819                 wl->stats.excessive_retries++;
 820                 retries = result->ack_failures;
 821         }
 822
 823         info->status.rates[0].idx = rate;
 824         info->status.rates[0].count = retries;
 825         info->status.rates[0].flags = rate_flags;
 826         info->status.ack_signal = -1;
 827
 828         wl->stats.retry_count += result->ack_failures;
 829
 830         /*
 831          * update sequence number only when relevant, i.e. only in
 832          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 833          */
 834         if (info->control.hw_key &&
 835             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 836              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 837              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 838                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 839                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 840
 841                 /*
 842                  * update security sequence number, taking care of potential
 843                  * wrap-around
 844                  */
 845                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 846                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 847         }
 848
 849         /* remove private header from packet */
 850         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 851
 852         /* remove TKIP header space if present */
 853         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 854             info->control.hw_key &&
 855             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 856                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 857                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 858                         hdrlen);
 859                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 860         }
 861
 862         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 863                      " status 0x%x",
 864                      result->id, skb, result->ack_failures,
 865                      result->rate_class_index, result->status);
 866
 867         /* return the packet to the stack */
 868         skb_queue_tail(&wl->deferred_tx_queue, skb);
 869         queue_work(wl->freezable_wq, &wl->netstack_work);
 870         wl1271_free_tx_id(wl, result->id);
 871 }
 872
 873 /* Called upon reception of a TX complete interrupt */
 874 void wl1271_tx_complete(struct wl1271 *wl)
 875 {
 876         struct wl1271_acx_mem_map *memmap =
 877                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 878         u32 count, fw_counter;
 879         u32 i;
 880
 881         /* read the tx results from the chipset */
 882         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 883                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 884         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 885
 886         /* write host counter to chipset (to ack) */
 887         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 888                        offsetof(struct wl1271_tx_hw_res_if,
 889                                 tx_result_host_counter), fw_counter);
 890
 891         count = fw_counter - wl->tx_results_count;
 892         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 893
 894         /* verify that the result buffer is not getting overrun */
 895         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 896                 wl1271_warning("TX result overflow from chipset: %d", count);
 897
 898         /* process the results */
 899         for (i = 0; i < count; i++) {
 900                 struct wl1271_tx_hw_res_descr *result;
 901                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 902
 903                 /* process the packet */
 904                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 905                 wl1271_tx_complete_packet(wl, result);
 906
 907                 wl->tx_results_count++;
 908         }
 909 }
 910 EXPORT_SYMBOL(wl1271_tx_complete);
 911
 912 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 913 {
 914         struct sk_buff *skb;
 915         int i;
 916         unsigned long flags;
 917         struct ieee80211_tx_info *info;
 918         int total[NUM_TX_QUEUES];
 919
 920         for (i = 0; i < NUM_TX_QUEUES; i++) {
 921                 total[i] = 0;
 922                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 923                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 924
 925                         if (!wl12xx_is_dummy_packet(wl, skb)) {
 926                                 info = IEEE80211_SKB_CB(skb);
 927                                 info->status.rates[0].idx = -1;
 928                                 info->status.rates[0].count = 0;
 929                                 ieee80211_tx_status_ni(wl->hw, skb);
 930                         }
 931
 932                         total[i]++;
 933                 }
 934         }
 935
 936         spin_lock_irqsave(&wl->wl_lock, flags);
 937         for (i = 0; i < NUM_TX_QUEUES; i++)
 938                 wl->tx_queue_count[i] -= total[i];
 939         spin_unlock_irqrestore(&wl->wl_lock, flags);
 940
 941         wl1271_handle_tx_low_watermark(wl);
 942 }
 943
 944 /* caller must hold wl->mutex and TX must be stopped */
 945 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 946 {
 947         int i;
 948
 949         /* TX failure */
 950         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
 951                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 952                         wl1271_free_sta(wl, wlvif, i);
 953                 else
 954                         wlvif->sta.ba_rx_bitmap = 0;
 955
 956                 wl->links[i].allocated_pkts = 0;
 957                 wl->links[i].prev_freed_pkts = 0;
 958         }
 959         wlvif->last_tx_hlid = 0;
 960
 961 }
 962 /* caller must hold wl->mutex and TX must be stopped */
 963 void wl12xx_tx_reset(struct wl1271 *wl)
 964 {
 965         int i;
 966         struct sk_buff *skb;
 967         struct ieee80211_tx_info *info;
 968
 969         /* only reset the queues if something bad happened */
 970         if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
 971                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
 972                         wl1271_tx_reset_link_queues(wl, i);
 973
 974                 for (i = 0; i < NUM_TX_QUEUES; i++)
 975                         wl->tx_queue_count[i] = 0;
 976         }
 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         wl1271_handle_tx_low_watermark(wl);
 984
 985         for (i = 0; i < wl->num_tx_desc; i++) {
 986                 if (wl->tx_frames[i] == NULL)
 987                         continue;
 988
 989                 skb = wl->tx_frames[i];
 990                 wl1271_free_tx_id(wl, i);
 991                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
 992
 993                 if (!wl12xx_is_dummy_packet(wl, skb)) {
 994                         /*
 995                          * Remove private headers before passing the skb to
 996                          * mac80211
 997                          */
 998                         info = IEEE80211_SKB_CB(skb);
 999                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1000                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1001                             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 }
1057
1058 void wlcore_stop_queue_locked(struct wl1271 *wl, u8 queue,
1059                               enum wlcore_queue_stop_reason reason)
1060 {
1061         bool stopped = !!wl->queue_stop_reasons[queue];
1062
1063         /* queue should not be stopped for this reason */
1064         WARN_ON(test_and_set_bit(reason, &wl->queue_stop_reasons[queue]));
1065
1066         if (stopped)
1067                 return;
1068
1069         ieee80211_stop_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1070 }
1071
1072 void wlcore_stop_queue(struct wl1271 *wl, u8 queue,
1073                        enum wlcore_queue_stop_reason reason)
1074 {
1075         unsigned long flags;
1076
1077         spin_lock_irqsave(&wl->wl_lock, flags);
1078         wlcore_stop_queue_locked(wl, queue, reason);
1079         spin_unlock_irqrestore(&wl->wl_lock, flags);
1080 }
1081
1082 void wlcore_wake_queue(struct wl1271 *wl, u8 queue,
1083                        enum wlcore_queue_stop_reason reason)
1084 {
1085         unsigned long flags;
1086
1087         spin_lock_irqsave(&wl->wl_lock, flags);
1088
1089         /* queue should not be clear for this reason */
1090         WARN_ON(!test_and_clear_bit(reason, &wl->queue_stop_reasons[queue]));
1091
1092         if (wl->queue_stop_reasons[queue])
1093                 goto out;
1094
1095         ieee80211_wake_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1096
1097 out:
1098         spin_unlock_irqrestore(&wl->wl_lock, flags);
1099 }
1100
1101 void wlcore_stop_queues(struct wl1271 *wl,
1102                         enum wlcore_queue_stop_reason reason)
1103 {
1104         int i;
1105
1106         for (i = 0; i < NUM_TX_QUEUES; i++)
1107                 wlcore_stop_queue(wl, i, reason);
1108 }
1109
1110 void wlcore_wake_queues(struct wl1271 *wl,
1111                         enum wlcore_queue_stop_reason reason)
1112 {
1113         int i;
1114
1115         for (i = 0; i < NUM_TX_QUEUES; i++)
1116                 wlcore_wake_queue(wl, i, reason);
1117 }
1118
1119 void wlcore_reset_stopped_queues(struct wl1271 *wl)
1120 {
1121         int i;
1122         unsigned long flags;
1123
1124         spin_lock_irqsave(&wl->wl_lock, flags);
1125
1126         for (i = 0; i < NUM_TX_QUEUES; i++) {
1127                 if (!wl->queue_stop_reasons[i])
1128                         continue;
1129
1130                 wl->queue_stop_reasons[i] = 0;
1131                 ieee80211_wake_queue(wl->hw,
1132                                      wl1271_tx_get_mac80211_queue(i));
1133         }
1134
1135         spin_unlock_irqrestore(&wl->wl_lock, flags);
1136 }
1137
1138 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, u8 queue,
1139                              enum wlcore_queue_stop_reason reason)
1140 {
1141         return test_bit(reason, &wl->queue_stop_reasons[queue]);
1142 }
1143
1144 bool wlcore_is_queue_stopped(struct wl1271 *wl, u8 queue)
1145 {
1146         return !!wl->queue_stop_reasons[queue];
1147 }