drivers/net/wireless/rt2x00/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         /*
 200          * Don't allow interfaces to be added while
 201          * either the device has disappeared or when
 202          * another interface is already present.
 203          */
 204         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 205             is_interface_present(intf))
 206                 return -ENOBUFS;
 207
 208         intf->id = conf->if_id;
 209         intf->type = conf->type;
 210         if (conf->type == IEEE80211_IF_TYPE_AP)
 211                 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
 212         memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
 213
 214         /*
 215          * The MAC adddress must be configured after the device
 216          * has been initialized. Otherwise the device can reset
 217          * the MAC registers.
 218          */
 219         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
 220         rt2x00lib_config_type(rt2x00dev, conf->type);
 221
 222         return 0;
 223 }
 224 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
 225
 226 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 227                                 struct ieee80211_if_init_conf *conf)
 228 {
 229         struct rt2x00_dev *rt2x00dev = hw->priv;
 230         struct interface *intf = &rt2x00dev->interface;
 231
 232         /*
 233          * Don't allow interfaces to be remove while
 234          * either the device has disappeared or when
 235          * no interface is present.
 236          */
 237         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 238             !is_interface_present(intf))
 239                 return;
 240
 241         intf->id = 0;
 242         intf->type = INVALID_INTERFACE;
 243         memset(&intf->bssid, 0x00, ETH_ALEN);
 244         memset(&intf->mac, 0x00, ETH_ALEN);
 245
 246         /*
 247          * Make sure the bssid and mac address registers
 248          * are cleared to prevent false ACKing of frames.
 249          */
 250         rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
 251         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
 252         rt2x00lib_config_type(rt2x00dev, intf->type);
 253 }
 254 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
 255
 256 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
 257 {
 258         struct rt2x00_dev *rt2x00dev = hw->priv;
 259
 260         /*
 261          * Mac80211 might be calling this function while we are trying
 262          * to remove the device or perhaps suspending it.
 263          */
 264         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 265                 return 0;
 266
 267         /*
 268          * Check if we need to disable the radio,
 269          * if this is not the case, at least the RX must be disabled.
 270          */
 271         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
 272                 if (!conf->radio_enabled)
 273                         rt2x00lib_disable_radio(rt2x00dev);
 274                 else
 275                         rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 276         }
 277
 278         rt2x00lib_config(rt2x00dev, conf, 0);
 279
 280         /*
 281          * Reenable RX only if the radio should be on.
 282          */
 283         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 284                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 285         else if (conf->radio_enabled)
 286                 return rt2x00lib_enable_radio(rt2x00dev);
 287
 288         return 0;
 289 }
 290 EXPORT_SYMBOL_GPL(rt2x00mac_config);
 291
 292 int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id,
 293                                struct ieee80211_if_conf *conf)
 294 {
 295         struct rt2x00_dev *rt2x00dev = hw->priv;
 296         struct interface *intf = &rt2x00dev->interface;
 297         int status;
 298
 299         /*
 300          * Mac80211 might be calling this function while we are trying
 301          * to remove the device or perhaps suspending it.
 302          */
 303         if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 304                 return 0;
 305
 306         /*
 307          * If the given type does not match the configured type,
 308          * there has been a problem.
 309          */
 310         if (conf->type != intf->type)
 311                 return -EINVAL;
 312
 313         /*
 314          * If the interface does not work in master mode,
 315          * then the bssid value in the interface structure
 316          * should now be set.
 317          */
 318         if (conf->type != IEEE80211_IF_TYPE_AP)
 319                 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
 320         rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
 321
 322         /*
 323          * We only need to initialize the beacon when master mode is enabled.
 324          */
 325         if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
 326                 return 0;
 327
 328         status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
 329                                                    conf->beacon,
 330                                                    conf->beacon_control);
 331         if (status)
 332                 dev_kfree_skb(conf->beacon);
 333
 334         return status;
 335 }
 336 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
 337
 338 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 339                         struct ieee80211_low_level_stats *stats)
 340 {
 341         struct rt2x00_dev *rt2x00dev = hw->priv;
 342
 343         /*
 344          * The dot11ACKFailureCount, dot11RTSFailureCount and
 345          * dot11RTSSuccessCount are updated in interrupt time.
 346          * dot11FCSErrorCount is updated in the link tuner.
 347          */
 348         memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
 349
 350         return 0;
 351 }
 352 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
 353
 354 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 355                            struct ieee80211_tx_queue_stats *stats)
 356 {
 357         struct rt2x00_dev *rt2x00dev = hw->priv;
 358         unsigned int i;
 359
 360         for (i = 0; i < hw->queues; i++)
 361                 memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
 362                        sizeof(rt2x00dev->tx[i].stats));
 363
 364         return 0;
 365 }
 366 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
 367
 368 void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
 369                               int cts_protection, int preamble)
 370 {
 371         struct rt2x00_dev *rt2x00dev = hw->priv;
 372         int short_preamble;
 373         int ack_timeout;
 374         int ack_consume_time;
 375         int difs;
 376
 377         /*
 378          * We only support changing preamble mode.
 379          */
 380         if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
 381                 return;
 382
 383         short_preamble = !preamble;
 384         preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;
 385
 386         difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
 387                 SHORT_DIFS : DIFS;
 388         ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);
 389
 390         ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);
 391
 392         if (short_preamble)
 393                 __set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 394         else
 395                 __clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 396
 397         rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
 398                                              ack_timeout, ack_consume_time);
 399 }
 400 EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);
 401
 402 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
 403                       const struct ieee80211_tx_queue_params *params)
 404 {
 405         struct rt2x00_dev *rt2x00dev = hw->priv;
 406         struct data_ring *ring;
 407
 408         ring = rt2x00lib_get_ring(rt2x00dev, queue);
 409         if (unlikely(!ring))
 410                 return -EINVAL;
 411
 412         /*
 413          * The passed variables are stored as real value ((2^n)-1).
 414          * Ralink registers require to know the bit number 'n'.
 415          */
 416         if (params->cw_min)
 417                 ring->tx_params.cw_min = fls(params->cw_min);
 418         else
 419                 ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */
 420
 421         if (params->cw_max)
 422                 ring->tx_params.cw_max = fls(params->cw_max);
 423         else
 424                 ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */
 425
 426         if (params->aifs)
 427                 ring->tx_params.aifs = params->aifs;
 428         else
 429                 ring->tx_params.aifs = 2;
 430
 431         INFO(rt2x00dev,
 432              "Configured TX ring %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
 433              queue, ring->tx_params.cw_min, ring->tx_params.cw_max,
 434              ring->tx_params.aifs);
 435
 436         return 0;
 437 }
 438 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);