package/rt2x00/src/rt2x00mac.c

   1 /*
   2         Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00mac
  23         Abstract: rt2x00 generic mac80211 routines.
  24  */
  25
  26 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00lib"
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33
  34 #include "rt2x00.h"
  35 #include "rt2x00lib.h"
  36
  37 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
  38                                 struct data_ring *ring,
  39                                 struct sk_buff *frag_skb,
  40                                 struct ieee80211_tx_control *control)
  41 {
  42         struct sk_buff *skb;
  43         int size;
  44
  45         if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
  46                 size = sizeof(struct ieee80211_cts);
  47         else
  48                 size = sizeof(struct ieee80211_rts);
  49
  50         skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
  51         if (!skb) {
  52                 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
  53                 return NETDEV_TX_BUSY;
  54         }
  55
  56         skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
  57         skb_put(skb, size);
  58
  59         if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
  60                 ieee80211_ctstoself_get(rt2x00dev->hw, rt2x00dev->interface.id,
  61                                         frag_skb->data, frag_skb->len, control,
  62                                         (struct ieee80211_cts *)(skb->data));
  63         else
  64                 ieee80211_rts_get(rt2x00dev->hw, rt2x00dev->interface.id,
  65                                   frag_skb->data, frag_skb->len, control,
  66                                   (struct ieee80211_rts *)(skb->data));
  67
  68         if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
  69                 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
  70                 return NETDEV_TX_BUSY;
  71         }
  72
  73         return NETDEV_TX_OK;
  74 }
  75
  76 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
  77                  struct ieee80211_tx_control *control)
  78 {
  79         struct rt2x00_dev *rt2x00dev = hw->priv;
  80         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
  81         struct data_ring *ring;
  82         u16 frame_control;
  83
  84         /*
  85          * Mac80211 might be calling this function while we are trying
  86          * to remove the device or perhaps suspending it.
  87          * Note that we can only stop the TX queues inside the TX path
  88          * due to possible race conditions in mac80211.
  89          */
  90         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
  91                 ieee80211_stop_queues(hw);
  92                 return 0;
  93         }
  94
  95         /*
  96          * Determine which ring to put packet on.
  97          */
  98         ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
  99         if (unlikely(!ring)) {
 100                 ERROR(rt2x00dev,
 101                       "Attempt to send packet over invalid queue %d.\n"
 102                       "Please file bug report to %s.\n",
 103                       control->queue, DRV_PROJECT);
 104                 dev_kfree_skb_any(skb);
 105                 return NETDEV_TX_OK;
 106         }
 107
 108         /*
 109          * If CTS/RTS is required. and this frame is not CTS or RTS,
 110          * create and queue that frame first. But make sure we have
 111          * at least enough entries available to send this CTS/RTS
 112          * frame as well as the data frame.
 113          */
 114         frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 115         if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
 116             (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
 117                                IEEE80211_TXCTL_USE_CTS_PROTECT))) {
 118                 if (rt2x00_ring_free(ring) <= 1)
 119                         return NETDEV_TX_BUSY;
 120
 121                 if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control))
 122                         return NETDEV_TX_BUSY;
 123         }
 124
 125         if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control))
 126                 return NETDEV_TX_BUSY;
 127
 128         if (rt2x00dev->ops->lib->kick_tx_queue)
 129                 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
 130
 131         return NETDEV_TX_OK;
 132 }
 133 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
 134
 135 int rt2x00mac_start(struct ieee80211_hw *hw)
 136 {
 137         struct rt2x00_dev *rt2x00dev = hw->priv;
 138         int status;
 139
 140         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 141             test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 142                 return 0;
 143
 144         /*
 145          * If this is the first interface which is added,
 146          * we should load the firmware now.
 147          */
 148         if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
 149                 status = rt2x00lib_load_firmware(rt2x00dev);
 150                 if (status)
 151                         return status;
 152         }
 153
 154         /*
 155          * Initialize the device.
 156          */
 157         status = rt2x00lib_initialize(rt2x00dev);
 158         if (status)
 159                 return status;
 160
 161         /*
 162          * Enable radio.
 163          */
 164         status = rt2x00lib_enable_radio(rt2x00dev);
 165         if (status) {
 166                 rt2x00lib_uninitialize(rt2x00dev);
 167                 return status;
 168         }
 169
 170         __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
 171
 172         return 0;
 173 }
 174 EXPORT_SYMBOL_GPL(rt2x00mac_start);
 175
 176 void rt2x00mac_stop(struct ieee80211_hw *hw)
 177 {
 178         struct rt2x00_dev *rt2x00dev = hw->priv;
 179
 180         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 181                 return;
 182
 183         /*
 184          * Perhaps we can add something smarter here,
 185          * but for now just disabling the radio should do.
 186          */
 187         rt2x00lib_disable_radio(rt2x00dev);
 188
 189         __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
 190 }
 191 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
 192
 193 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 194                             struct ieee80211_if_init_conf *conf)
 195 {
 196         struct rt2x00_dev *rt2x00dev = hw->priv;
 197         struct interface *intf = &rt2x00dev->interface;
 198
 199         /* FIXME: Beaconing is broken in rt2x00. */
 200         if (conf->type == IEEE80211_IF_TYPE_IBSS ||
 201             conf->type == IEEE80211_IF_TYPE_AP) {
 202                 ERROR(rt2x00dev,
 203                       "rt2x00 does not support Adhoc or Master mode");
 204                 return -EOPNOTSUPP;
 205         }
 206
 207         /*
 208          * Don't allow interfaces to be added while
 209          * either the device has disappeared or when
 210          * another interface is already present.
 211          */
 212         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 213             is_interface_present(intf))
 214                 return -ENOBUFS;
 215
 216         intf->id = conf->if_id;
 217         intf->type = conf->type;
 218         if (conf->type == IEEE80211_IF_TYPE_AP)
 219                 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
 220         memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
 221
 222         /*
 223          * The MAC adddress must be configured after the device
 224          * has been initialized. Otherwise the device can reset
 225          * the MAC registers.
 226          */
 227         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
 228         rt2x00lib_config_type(rt2x00dev, conf->type);
 229
 230         return 0;
 231 }
 232 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 233
 234 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 235                                 struct ieee80211_if_init_conf *conf)
 236 {
 237         struct rt2x00_dev *rt2x00dev = hw->priv;
 238         struct interface *intf = &rt2x00dev->interface;
 239
 240         /*
 241          * Don't allow interfaces to be remove while
 242          * either the device has disappeared or when
 243          * no interface is present.
 244          */
 245         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 246             !is_interface_present(intf))
 247                 return;
 248
 249         intf->id = 0;
 250         intf->type = INVALID_INTERFACE;
 251         memset(&intf->bssid, 0x00, ETH_ALEN);
 252         memset(&intf->mac, 0x00, ETH_ALEN);
 253
 254         /*
 255          * Make sure the bssid and mac address registers
 256          * are cleared to prevent false ACKing of frames.
 257          */
 258         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
 259         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
 260         rt2x00lib_config_type(rt2x00dev, intf->type);
 261 }
 262 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 263
 264 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
 265 {
 266         struct rt2x00_dev *rt2x00dev = hw->priv;
 267
 268         /*
 269          * Mac80211 might be calling this function while we are trying
 270          * to remove the device or perhaps suspending it.
 271          */
 272         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 273                 return 0;
 274
 275         /*
 276          * Check if we need to disable the radio,
 277          * if this is not the case, at least the RX must be disabled.
 278          */
 279         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
 280                 if (!conf->radio_enabled)
 281                         rt2x00lib_disable_radio(rt2x00dev);
 282                 else
 283                         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 284         }
 285
 286         rt2x00lib_config(rt2x00dev, conf, 0);
 287
 288         /*
 289          * Reenable RX only if the radio should be on.
 290          */
 291         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 292                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 293         else if (conf->radio_enabled)
 294                 return rt2x00lib_enable_radio(rt2x00dev);
 295
 296         return 0;
 297 }
 298 EXPORT_SYMBOL_GPL(rt2x00mac_config);
 299
 300 int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id,
 301                                struct ieee80211_if_conf *conf)
 302 {
 303         struct rt2x00_dev *rt2x00dev = hw->priv;
 304         struct interface *intf = &rt2x00dev->interface;
 305         int status;
 306
 307         /*
 308          * Mac80211 might be calling this function while we are trying
 309          * to remove the device or perhaps suspending it.
 310          */
 311         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 312                 return 0;
 313
 314         /*
 315          * If the given type does not match the configured type,
 316          * there has been a problem.
 317          */
 318         if (conf->type != intf->type)
 319                 return -EINVAL;
 320
 321         /*
 322          * If the interface does not work in master mode,
 323          * then the bssid value in the interface structure
 324          * should now be set.
 325          */
 326         if (conf->type != IEEE80211_IF_TYPE_AP)
 327                 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
 328         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
 329
 330         /*
 331          * We only need to initialize the beacon when master mode is enabled.
 332          */
 333         if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
 334                 return 0;
 335
 336         status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
 337                                                    conf->beacon,
 338                                                    conf->beacon_control);
 339         if (status)
 340                 dev_kfree_skb(conf->beacon);
 341
 342         return status;
 343 }
 344 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
 345
 346 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 347                         struct ieee80211_low_level_stats *stats)
 348 {
 349         struct rt2x00_dev *rt2x00dev = hw->priv;
 350
 351         /*
 352          * The dot11ACKFailureCount, dot11RTSFailureCount and
 353          * dot11RTSSuccessCount are updated in interrupt time.
 354          * dot11FCSErrorCount is updated in the link tuner.
 355          */
 356         memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 357
 358         return 0;
 359 }
 360 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 361
 362 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 363                            struct ieee80211_tx_queue_stats *stats)
 364 {
 365         struct rt2x00_dev *rt2x00dev = hw->priv;
 366         unsigned int i;
 367
 368         for (i = 0; i < hw->queues; i++)
 369                 memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
 370                        sizeof(rt2x00dev->tx[i].stats));
 371
 372         return 0;
 373 }
 374 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
 375
 376 void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
 377                               int cts_protection, int preamble)
 378 {
 379         struct rt2x00_dev *rt2x00dev = hw->priv;
 380         int short_preamble;
 381         int ack_timeout;
 382         int ack_consume_time;
 383         int difs;
 384
 385         /*
 386          * We only support changing preamble mode.
 387          */
 388         if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
 389                 return;
 390
 391         short_preamble = !preamble;
 392         preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;
 393
 394         difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
 395                 SHORT_DIFS : DIFS;
 396         ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);
 397
 398         ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);
 399
 400         if (short_preamble)
 401                 __set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 402         else
 403                 __clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 404
 405         rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
 406                                              ack_timeout, ack_consume_time);
 407 }
 408 EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);
 409
 410 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
 411                       const struct ieee80211_tx_queue_params *params)
 412 {
 413         struct rt2x00_dev *rt2x00dev = hw->priv;
 414         struct data_ring *ring;
 415
 416         ring = rt2x00lib_get_ring(rt2x00dev, queue);
 417         if (unlikely(!ring))
 418                 return -EINVAL;
 419
 420         /*
 421          * The passed variables are stored as real value ((2^n)-1).
 422          * Ralink registers require to know the bit number 'n'.
 423          */
 424         if (params->cw_min)
 425                 ring->tx_params.cw_min = fls(params->cw_min);
 426         else
 427                 ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */
 428
 429         if (params->cw_max)
 430                 ring->tx_params.cw_max = fls(params->cw_max);
 431         else
 432                 ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */
 433
 434         if (params->aifs)
 435                 ring->tx_params.aifs = params->aifs;
 436         else
 437                 ring->tx_params.aifs = 2;
 438
 439         INFO(rt2x00dev,
 440              "Configured TX ring %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
 441              queue, ring->tx_params.cw_min, ring->tx_params.cw_max,
 442              ring->tx_params.aifs);
 443
 444         return 0;
 445 }
 446 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);