/*
Copyright (C) 2004 - 2008 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: rt2x00mac
Abstract: rt2x00 generic mac80211 routines.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include "rt2x00.h"
#include "rt2x00lib.h"
static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
struct data_queue *queue,
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, control->vif,
frag_skb->data, frag_skb->len, control,
(struct ieee80211_cts *)(skb->data));
else
ieee80211_rts_get(rt2x00dev->hw, control->vif,
frag_skb->data, frag_skb->len, control,
(struct ieee80211_rts *)(skb->data));
if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
return NETDEV_TX_BUSY;
}
return NETDEV_TX_OK;
}
int rt2x00mac_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_queue *queue;
u16 frame_control;
/*
* Mac80211 might be calling this function while we are trying
* to remove the device or perhaps suspending it.
* Note that we can only stop the TX queues inside the TX path
* due to possible race conditions in mac80211.
*/
if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
ieee80211_stop_queues(hw);
return NETDEV_TX_OK;
}
/*
* Determine which queue to put packet on.
*/
queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
if (unlikely(!queue)) {
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 (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
(control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
IEEE80211_TXCTL_USE_CTS_PROTECT))) {
if (rt2x00queue_available(queue) <= 1) {
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
return NETDEV_TX_BUSY;
}
if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) {
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
return NETDEV_TX_BUSY;
}
}
if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
return NETDEV_TX_BUSY;
}
if (rt2x00queue_full(queue))
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
if (rt2x00dev->ops->lib->kick_tx_queue)
rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
return NETDEV_TX_OK;
}
EXPORT_SYMBOL_GPL(rt2x00mac_tx);
int rt2x00mac_start(struct ieee80211_hw *hw)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
return 0;
return rt2x00lib_start(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00mac_start);
void rt2x00mac_stop(struct ieee80211_hw *hw)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
return;
rt2x00lib_stop(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00mac_stop);
int rt2x00mac_add_interface(struct ieee80211_hw *hw,
struct ieee80211_if_init_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct rt2x00_intf *intf = vif_to_intf(conf->vif);
struct data_queue *queue =
rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON);
struct queue_entry *entry = NULL;
unsigned int i;
/*
* Don't allow interfaces to be added
* the device has disappeared.
*/
if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
return -ENODEV;
/*
* When we don't support mixed interfaces (a combination
* of sta and ap virtual interfaces) then we can only
* add this interface when the rival interface count is 0.
*/
if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) &&
((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
(conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count)))
return -ENOBUFS;
/*
* Check if we exceeded the maximum amount of supported interfaces.
*/
if ((conf->type == IEEE80211_IF_TYPE_AP &&
rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
(conf->type != IEEE80211_IF_TYPE_AP &&
rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
return -ENOBUFS;
/*
* Loop through all beacon queues to find a free
* entry. Since there are as much beacon entries
* as the maximum interfaces, this search shouldn't
* fail.
*/
for (i = 0; i < queue->limit; i++) {
entry = &queue->entries[i];
if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
break;
}
if (unlikely(i == queue->limit))
return -ENOBUFS;
/*
* We are now absolutely sure the interface can be created,
* increase interface count and start initialization.
*/
if (conf->type == IEEE80211_IF_TYPE_AP)
rt2x00dev->intf_ap_count++;
else
rt2x00dev->intf_sta_count++;
spin_lock_init(&intf->lock);
intf->beacon = entry;
if (conf->type == IEEE80211_IF_TYPE_AP)
memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
/*
* The MAC adddress must be configured after the device
* has been initialized. Otherwise the device can reset
* the MAC registers.
*/
rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
struct ieee80211_if_init_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct rt2x00_intf *intf = vif_to_intf(conf->vif);
/*
* Don't allow interfaces to be remove while
* either the device has disappeared or when
* no interface is present.
*/
if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
(conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
(conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
return;
if (conf->type == IEEE80211_IF_TYPE_AP)
rt2x00dev->intf_ap_count--;
else
rt2x00dev->intf_sta_count--;
/*
* Release beacon entry so it is available for
* new interfaces again.
*/
__clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
/*
* Make sure the bssid and mac address registers
* are cleared to prevent false ACKing of frames.
*/
rt2x00lib_config_intf(rt2x00dev, intf,
IEEE80211_IF_TYPE_INVALID, NULL, NULL);
}
EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
/*
* Mac80211 might be calling this function while we are trying
* to remove the device or perhaps suspending it.
*/
if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
return 0;
/*
* 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, STATE_RADIO_RX_OFF);
}
rt2x00lib_config(rt2x00dev, conf, 0);
/*
* Reenable RX only if the radio should be on.
*/
if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
else if (conf->radio_enabled)
return rt2x00lib_enable_radio(rt2x00dev);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_config);
int rt2x00mac_config_interface(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_if_conf *conf)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct rt2x00_intf *intf = vif_to_intf(vif);
int status;
/*
* Mac80211 might be calling this function while we are trying
* to remove the device or perhaps suspending it.
*/
if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
return 0;
spin_lock(&intf->lock);
/*
* 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);
rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, intf->bssid);
spin_unlock(&intf->lock);
/*
* 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(rt2x00mac_config_interface);
int rt2x00mac_get_stats(struct ieee80211_hw *hw,
struct ieee80211_low_level_stats *stats)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
/*
* The dot11ACKFailureCount, dot11RTSFailureCount and
* dot11RTSSuccessCount are updated in interrupt time.
* dot11FCSErrorCount is updated in the link tuner.
*/
memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
int rt2x00mac_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++) {
stats->data[i].len = rt2x00dev->tx[i].length;
stats->data[i].limit = rt2x00dev->tx[i].limit;
stats->data[i].count = rt2x00dev->tx[i].count;
}
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_bss_conf *bss_conf,
u32 changes)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct rt2x00_intf *intf = vif_to_intf(vif);
/*
* When the association status has changed we must reset the link
* tuner counter. This is because some drivers determine if they
* should perform link tuning based on the number of seconds
* while associated or not associated.
*/
if (changes & BSS_CHANGED_ASSOC) {
rt2x00dev->link.count = 0;
if (bss_conf->assoc)
rt2x00dev->intf_associated++;
else
rt2x00dev->intf_associated--;
}
/*
* When the preamble mode has changed, we should perform additional
* configuration steps. For all other changes we are already done.
*/
if (changes & BSS_CHANGED_ERP_PREAMBLE) {
rt2x00lib_config_preamble(rt2x00dev, intf,
bss_conf->use_short_preamble);
spin_lock(&intf->lock);
memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
spin_unlock(&intf->lock);
}
}
EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx,
const struct ieee80211_tx_queue_params *params)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct data_queue *queue;
queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
if (unlikely(!queue))
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 > 0)
queue->cw_min = fls(params->cw_min);
else
queue->cw_min = 5; /* cw_min: 2^5 = 32. */
if (params->cw_max > 0)
queue->cw_max = fls(params->cw_max);
else
queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
if (params->aifs >= 0)
queue->aifs = params->aifs;
else
queue->aifs = 2;
INFO(rt2x00dev,
"Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
