2 Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
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.
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.
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.
23 Abstract: rt2x00 generic mac80211 routines.
27 * Set enviroment defines for rt2x00.h
29 #define DRV_NAME "rt2x00lib"
31 #include <linux/kernel.h>
32 #include <linux/module.h>
35 #include "rt2x00lib.h"
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)
45 if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
46 size = sizeof(struct ieee80211_cts);
48 size = sizeof(struct ieee80211_rts);
50 skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
52 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
53 return NETDEV_TX_BUSY;
56 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
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));
64 ieee80211_rts_get(rt2x00dev->hw, rt2x00dev->interface.id,
65 frag_skb->data, frag_skb->len, control,
66 (struct ieee80211_rts *)(skb->data));
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;
76 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
77 struct ieee80211_tx_control *control)
79 struct rt2x00_dev *rt2x00dev = hw->priv;
80 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
81 struct data_ring *ring;
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.
90 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
91 ieee80211_stop_queues(hw);
96 * Determine which ring to put packet on.
98 ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
99 if (unlikely(!ring)) {
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);
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.
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;
121 if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control))
122 return NETDEV_TX_BUSY;
125 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control))
126 return NETDEV_TX_BUSY;
128 if (rt2x00dev->ops->lib->kick_tx_queue)
129 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
133 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
135 int rt2x00mac_start(struct ieee80211_hw *hw)
137 struct rt2x00_dev *rt2x00dev = hw->priv;
140 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
141 test_bit(DEVICE_STARTED, &rt2x00dev->flags))
145 * If this is the first interface which is added,
146 * we should load the firmware now.
148 if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
149 status = rt2x00lib_load_firmware(rt2x00dev);
155 * Initialize the device.
157 status = rt2x00lib_initialize(rt2x00dev);
164 status = rt2x00lib_enable_radio(rt2x00dev);
166 rt2x00lib_uninitialize(rt2x00dev);
170 __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
174 EXPORT_SYMBOL_GPL(rt2x00mac_start);
176 void rt2x00mac_stop(struct ieee80211_hw *hw)
178 struct rt2x00_dev *rt2x00dev = hw->priv;
180 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
184 * Perhaps we can add something smarter here,
185 * but for now just disabling the radio should do.
187 rt2x00lib_disable_radio(rt2x00dev);
189 __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
191 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
193 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
194 struct ieee80211_if_init_conf *conf)
196 struct rt2x00_dev *rt2x00dev = hw->priv;
197 struct interface *intf = &rt2x00dev->interface;
200 * Don't allow interfaces to be added while
201 * either the device has disappeared or when
202 * another interface is already present.
204 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
205 is_interface_present(intf))
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);
215 * The MAC adddress must be configured after the device
216 * has been initialized. Otherwise the device can reset
219 rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
220 rt2x00lib_config_type(rt2x00dev, conf->type);
224 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
226 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
227 struct ieee80211_if_init_conf *conf)
229 struct rt2x00_dev *rt2x00dev = hw->priv;
230 struct interface *intf = &rt2x00dev->interface;
233 * Don't allow interfaces to be remove while
234 * either the device has disappeared or when
235 * no interface is present.
237 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
238 !is_interface_present(intf))
242 intf->type = INVALID_INTERFACE;
243 memset(&intf->bssid, 0x00, ETH_ALEN);
244 memset(&intf->mac, 0x00, ETH_ALEN);
247 * Make sure the bssid and mac address registers
248 * are cleared to prevent false ACKing of frames.
250 rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
251 rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
252 rt2x00lib_config_type(rt2x00dev, intf->type);
254 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
256 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
258 struct rt2x00_dev *rt2x00dev = hw->priv;
261 * Mac80211 might be calling this function while we are trying
262 * to remove the device or perhaps suspending it.
264 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
268 * Check if we need to disable the radio,
269 * if this is not the case, at least the RX must be disabled.
271 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
272 if (!conf->radio_enabled)
273 rt2x00lib_disable_radio(rt2x00dev);
275 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
278 rt2x00lib_config(rt2x00dev, conf, 0);
281 * Reenable RX only if the radio should be on.
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);
290 EXPORT_SYMBOL_GPL(rt2x00mac_config);
292 int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id,
293 struct ieee80211_if_conf *conf)
295 struct rt2x00_dev *rt2x00dev = hw->priv;
296 struct interface *intf = &rt2x00dev->interface;
300 * Mac80211 might be calling this function while we are trying
301 * to remove the device or perhaps suspending it.
303 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
307 * If the given type does not match the configured type,
308 * there has been a problem.
310 if (conf->type != intf->type)
314 * If the interface does not work in master mode,
315 * then the bssid value in the interface structure
318 if (conf->type != IEEE80211_IF_TYPE_AP)
319 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
320 rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
323 * We only need to initialize the beacon when master mode is enabled.
325 if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
328 status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
330 conf->beacon_control);
332 dev_kfree_skb(conf->beacon);
336 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
338 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
339 struct ieee80211_low_level_stats *stats)
341 struct rt2x00_dev *rt2x00dev = hw->priv;
344 * The dot11ACKFailureCount, dot11RTSFailureCount and
345 * dot11RTSSuccessCount are updated in interrupt time.
346 * dot11FCSErrorCount is updated in the link tuner.
348 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
352 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
354 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
355 struct ieee80211_tx_queue_stats *stats)
357 struct rt2x00_dev *rt2x00dev = hw->priv;
360 for (i = 0; i < hw->queues; i++)
361 memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
362 sizeof(rt2x00dev->tx[i].stats));
366 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
368 void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
369 int cts_protection, int preamble)
371 struct rt2x00_dev *rt2x00dev = hw->priv;
374 int ack_consume_time;
378 * We only support changing preamble mode.
380 if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
383 short_preamble = !preamble;
384 preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;
386 difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
388 ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);
390 ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);
393 __set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
395 __clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
397 rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
398 ack_timeout, ack_consume_time);
400 EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);
402 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
403 const struct ieee80211_tx_queue_params *params)
405 struct rt2x00_dev *rt2x00dev = hw->priv;
406 struct data_ring *ring;
408 ring = rt2x00lib_get_ring(rt2x00dev, queue);
413 * The passed variables are stored as real value ((2^n)-1).
414 * Ralink registers require to know the bit number 'n'.
417 ring->tx_params.cw_min = fls(params->cw_min);
419 ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */
422 ring->tx_params.cw_max = fls(params->cw_max);
424 ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */
427 ring->tx_params.aifs = params->aifs;
429 ring->tx_params.aifs = 2;
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);
438 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);