openwrt/package/rt2x00/src/rt2x00mac.c

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/*
Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
<http://rt2x00.serialmonkey.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the
Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
Module: rt2x00lib
Abstract: rt2x00 generic mac80211 routines.
Supported chipsets: RT2460, RT2560, RT2570,
rt2561, rt2561s, rt2661, rt2571W & rt2671.
*/
/*
* Set enviroment defines for rt2x00.h
*/
#define DRV_NAME "rt2x00lib"
#include <linux/netdevice.h>
#include "rt2x00.h"
#include "rt2x00dev.h"
static int rt2x00_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring, struct sk_buff *frag_skb,
struct ieee80211_tx_control *control)
{
struct sk_buff *skb;
int size;
if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
size = sizeof(struct ieee80211_cts);
else
size = sizeof(struct ieee80211_rts);
skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
if (!skb) {
WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
return NETDEV_TX_BUSY;
}
skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
skb_put(skb, size);
if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
ieee80211_ctstoself_get(rt2x00dev->hw,
frag_skb->data, frag_skb->len, control,
(struct ieee80211_cts*)(skb->data));
else
ieee80211_rts_get(rt2x00dev->hw,
frag_skb->data, frag_skb->len, control,
(struct ieee80211_rts*)(skb->data));
if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
return NETDEV_TX_BUSY;
}
return NETDEV_TX_OK;
}
int rt2x00lib_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
struct ieee80211_tx_control *control)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr*)skb->data;
struct data_ring *ring;
u16 frame_control;
/*
* Determine which ring to put packet on.
*/
ring = rt2x00_get_ring(rt2x00dev, control->queue);
if (unlikely(!ring)) {
ERROR(rt2x00dev,
"Attempt to send packet over invalid queue %d.\n"
"Please file bug report to %s.\n",
control->queue, DRV_PROJECT);
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/*
* If CTS/RTS is required. and this frame is not CTS or RTS,
* create and queue that frame first. But make sure we have
* at least enough entries available to send this CTS/RTS
* frame as well as the data frame.
*/
frame_control = le16_to_cpu(ieee80211hdr->frame_control);
if (control->flags & IEEE80211_TXCTL_USE_RTS_CTS &&
!is_cts_frame(frame_control) && !is_rts_frame(frame_control)) {
if (rt2x00_ring_free(ring) <= 1)
return NETDEV_TX_BUSY;
if (rt2x00_tx_rts_cts(rt2x00dev, ring, skb, control))
return NETDEV_TX_BUSY;
}
if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control))
return NETDEV_TX_BUSY;
if (rt2x00dev->ops->lib->kick_tx_queue)
rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
return NETDEV_TX_OK;
}
EXPORT_SYMBOL_GPL(rt2x00lib_tx);
int rt2x00lib_reset(struct ieee80211_hw *hw)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
rt2x00lib_disable_radio(rt2x00dev);
return rt2x00lib_enable_radio(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00lib_reset);
int rt2x00lib_open(struct ieee80211_hw *hw)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
int status;
/*
* We must wait on the firmware before
* we can safely continue.
*/
status = rt2x00lib_load_firmware_wait(rt2x00dev);
if (status)
return status;
/*
* Initialize the device.
*/
status = rt2x00lib_initialize(rt2x00dev);
if (status)
return status;
/*
* Enable radio.
*/
status = rt2x00lib_enable_radio(rt2x00dev);
if (status) {
rt2x00lib_uninitialize(rt2x00dev);
return status;
}
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_open);
int rt2x00lib_stop(struct ieee80211_hw *hw)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
rt2x00lib_disable_radio(rt2x00dev);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_stop);
int rt2x00lib_add_interface(struct ieee80211_hw *hw,
struct ieee80211_if_init_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct interface *intf = &rt2x00dev->interface;
/*
* We only support 1 non-monitor interface.
*/
if (conf->type != IEEE80211_IF_TYPE_MNTR &&
is_interface_present(&rt2x00dev->interface))
return -ENOBUFS;
/*
* We support muliple monitor mode interfaces.
* All we need to do is increase the monitor_count.
*/
if (conf->type == IEEE80211_IF_TYPE_MNTR) {
intf->monitor_count++;
} else {
intf->id = conf->if_id;
intf->type = conf->type;
if (conf->type == IEEE80211_IF_TYPE_AP)
memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
intf->promisc = 0;
}
/*
* If this is the first interface which is being added,
* we should write the MAC address to the device.
*/
if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00dev->ops->lib->config_mac_addr(rt2x00dev, conf->mac_addr);
/*
* Enable periodic link tuning if this is a non-monitor interface.
*/
if (conf->type != IEEE80211_IF_TYPE_MNTR)
rt2x00_start_link_tune(rt2x00dev);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_add_interface);
void rt2x00lib_remove_interface(struct ieee80211_hw *hw,
struct ieee80211_if_init_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct interface *intf = &rt2x00dev->interface;
/*
* We only support 1 non-monitor interface.
*/
if (conf->type != IEEE80211_IF_TYPE_MNTR &&
!is_interface_present(&rt2x00dev->interface))
return;
/*
* We support muliple monitor mode interfaces.
* All we need to do is decrease the monitor_count.
*/
if (conf->type == IEEE80211_IF_TYPE_MNTR) {
intf->monitor_count--;
} else if (intf->type == conf->type) {
intf->id = 0;
intf->type = -EINVAL;
memset(&intf->bssid, 0x00, ETH_ALEN);
intf->promisc = 0;
}
/*
* When this is a non-monitor mode, stop the periodic link tuning.
*/
if (conf->type != IEEE80211_IF_TYPE_MNTR)
rt2x00_stop_link_tune(rt2x00dev);
/*
* Check if we still have 1 non-monitor or a monitor
* interface enabled. In that case we should update the
* registers.
*/
if (is_monitor_present(&rt2x00dev->interface) ^
is_interface_present(&rt2x00dev->interface)) {
if (is_interface_present(&rt2x00dev->interface))
rt2x00lib_config_type(rt2x00dev,
rt2x00dev->interface.type);
else
rt2x00lib_config_type(rt2x00dev,
IEEE80211_IF_TYPE_MNTR);
}
/*
* Check which interfaces have been disabled.
*/
if (!is_interface_present(&rt2x00dev->interface))
__clear_bit(INTERFACE_ENABLED, &rt2x00dev->flags);
else if (!is_monitor_present(&rt2x00dev->interface))
__clear_bit(INTERFACE_ENABLED_MONITOR, &rt2x00dev->flags);
}
EXPORT_SYMBOL_GPL(rt2x00lib_remove_interface);
int rt2x00lib_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
/*
* Check if we need to disable the radio,
* if this is not the case, at least the RX must be disabled.
*/
if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
if (!conf->radio_enabled)
rt2x00lib_disable_radio(rt2x00dev);
else
rt2x00lib_toggle_rx(rt2x00dev, 0);
}
rt2x00lib_config_phymode(rt2x00dev, conf->phymode);
rt2x00lib_config_channel(rt2x00dev, conf->channel_val,
conf->channel, conf->freq, conf->power_level);
rt2x00lib_config_txpower(rt2x00dev, conf->power_level);
rt2x00lib_config_antenna(rt2x00dev,
conf->antenna_sel_tx, conf->antenna_sel_rx);
rt2x00dev->ops->lib->config_duration(rt2x00dev,
(conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME),
conf->beacon_int);
/*
* Reenable RX only if the radio should be on.
*/
if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00lib_toggle_rx(rt2x00dev, 1);
else if (conf->radio_enabled)
return rt2x00lib_enable_radio(rt2x00dev);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_config);
int rt2x00lib_config_interface(struct ieee80211_hw *hw, int if_id,
struct ieee80211_if_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct interface *intf = &rt2x00dev->interface;
int status;
/*
* Monitor mode does not need configuring.
* If the given type does not match the configured type,
* there has been a problem.
*/
if (conf->type == IEEE80211_IF_TYPE_MNTR)
return 0;
else if (conf->type != intf->type)
return -EINVAL;
/*
* If the interface does not work in master mode,
* then the bssid value in the interface structure
* should now be set.
*/
if (conf->type != IEEE80211_IF_TYPE_AP)
memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
/*
* Enable configuration.
* For Monitor mode, promisc mode will be forced on.
*/
rt2x00lib_config_type(rt2x00dev, conf->type);
rt2x00lib_config_promisc(rt2x00dev, rt2x00dev->interface.promisc);
rt2x00dev->ops->lib->config_bssid(rt2x00dev, intf->bssid);
/*
* We only need to initialize the beacon when master mode is enabled.
*/
if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
return 0;
status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
conf->beacon, conf->beacon_control);
if (status)
dev_kfree_skb(conf->beacon);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00lib_config_interface);
void rt2x00lib_set_multicast_list(struct ieee80211_hw *hw,
unsigned short flags, int mc_count)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
/*
* Promisc mode is forced on for Monitor interfaces.
*/
if (is_monitor_present(&rt2x00dev->interface))
return;
/*
* Check if the new state is different then the old state.
*/
if (test_bit(INTERFACE_ENABLED_PROMISC, &rt2x00dev->flags) ==
(flags & IFF_PROMISC))
return;
rt2x00dev->interface.promisc = (flags & IFF_PROMISC);
/*
* Schedule the link tuner if this does not run
* automatically. The link tuner will be automatically
* switched off when it is not required.
*/
if (!work_pending(&rt2x00dev->link.work.work))
queue_work(rt2x00dev->workqueue, &rt2x00dev->link.work.work);
}
EXPORT_SYMBOL_GPL(rt2x00lib_set_multicast_list);
int rt2x00lib_get_tx_stats(struct ieee80211_hw *hw,
struct ieee80211_tx_queue_stats *stats)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
unsigned int i;
for (i = 0; i < hw->queues; i++)
memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
sizeof(rt2x00dev->tx[i].stats));
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_get_tx_stats);
int rt2x00lib_conf_tx(struct ieee80211_hw *hw, int queue,
const struct ieee80211_tx_queue_params *params)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct data_ring *ring;
ring = rt2x00_get_ring(rt2x00dev, queue);
if (unlikely(!ring))
return -EINVAL;
/*
* The passed variables are stored as real value ((2^n)-1).
* Ralink registers require to know the bit number 'n'.
*/
if (params->cw_min)
ring->tx_params.cw_min = fls(params->cw_min);
else
ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */
if (params->cw_max)
ring->tx_params.cw_max = fls(params->cw_max);
else
ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */
if (params->aifs)
ring->tx_params.aifs = params->aifs;
else
ring->tx_params.aifs = 2;
INFO(rt2x00dev,
"Configured TX ring %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
queue, ring->tx_params.cw_min, ring->tx_params.cw_max,
ring->tx_params.aifs);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_conf_tx);