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b43: implement short slot and basic rate handling 

This implements proper short slot handling and adds code to
program the hardware for the correct response rates derived
from the basic rate set for the current BSS.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-10-29 20:02:12 +01:00 committed by John W. Linville
parent bd81525272
commit c7ab5ef9bc
2 changed files with 99 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/b43/b43.h
View File

@ -718,7 +718,6 @@ struct b43_wldev {
bool bad_frames_preempt; /* Use "Bad Frames Preemption" (default off) */
bool dfq_valid; /* Directed frame queue valid (IBSS PS mode, ATIM) */
bool short_slot; /* TRUE, if short slot timing is enabled. */
bool radio_hw_enable; /* saved state of radio hardware enabled state */
bool suspend_in_progress; /* TRUE, if we are in a suspend/resume cycle */

111
drivers/net/wireless/b43/main.c
View File

@ -703,13 +703,11 @@ static void b43_set_slot_time(struct b43_wldev *dev, u16 slot_time)
static void b43_short_slot_timing_enable(struct b43_wldev *dev)
{
b43_set_slot_time(dev, 9);
dev->short_slot = 1;
}
static void b43_short_slot_timing_disable(struct b43_wldev *dev)
{
b43_set_slot_time(dev, 20);
dev->short_slot = 0;
}
/* Enable a Generic IRQ. "mask" is the mask of which IRQs to enable.
@ -3361,16 +3359,6 @@ static int b43_op_config(struct ieee80211_hw *hw, u32 changed)
if (conf->channel->hw_value != phy->channel)
b43_switch_channel(dev, conf->channel->hw_value);
/* Enable/Disable ShortSlot timing. */
if ((!!(conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME)) !=
dev->short_slot) {
B43_WARN_ON(phy->type != B43_PHYTYPE_G);
if (conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME)
b43_short_slot_timing_enable(dev);
else
b43_short_slot_timing_disable(dev);
}
dev->wl->radiotap_enabled = !!(conf->flags & IEEE80211_CONF_RADIOTAP);
/* Adjust the desired TX power level. */
@ -3421,6 +3409,104 @@ static int b43_op_config(struct ieee80211_hw *hw, u32 changed)
return err;
}
static void b43_update_basic_rates(struct b43_wldev *dev, u64 brates)
{
struct ieee80211_supported_band *sband =
dev->wl->hw->wiphy->bands[b43_current_band(dev->wl)];
struct ieee80211_rate *rate;
int i;
u16 basic, direct, offset, basic_offset, rateptr;
for (i = 0; i < sband->n_bitrates; i++) {
rate = &sband->bitrates[i];
if (b43_is_cck_rate(rate->hw_value)) {
direct = B43_SHM_SH_CCKDIRECT;
basic = B43_SHM_SH_CCKBASIC;
offset = b43_plcp_get_ratecode_cck(rate->hw_value);
offset &= 0xF;
} else {
direct = B43_SHM_SH_OFDMDIRECT;
basic = B43_SHM_SH_OFDMBASIC;
offset = b43_plcp_get_ratecode_ofdm(rate->hw_value);
offset &= 0xF;
}
rate = ieee80211_get_response_rate(sband, brates, rate->bitrate);
if (b43_is_cck_rate(rate->hw_value)) {
basic_offset = b43_plcp_get_ratecode_cck(rate->hw_value);
basic_offset &= 0xF;
} else {
basic_offset = b43_plcp_get_ratecode_ofdm(rate->hw_value);
basic_offset &= 0xF;
}
/*
* Get the pointer that we need to point to
* from the direct map
*/
rateptr = b43_shm_read16(dev, B43_SHM_SHARED,
direct + 2 * basic_offset);
/* and write it to the basic map */
b43_shm_write16(dev, B43_SHM_SHARED, basic + 2 * offset,
rateptr);
}
}
static void b43_op_bss_info_changed(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_bss_conf *conf,
u32 changed)
{
struct b43_wl *wl = hw_to_b43_wl(hw);
struct b43_wldev *dev;
struct b43_phy *phy;
unsigned long flags;
u32 savedirqs;
mutex_lock(&wl->mutex);
dev = wl->current_dev;
phy = &dev->phy;
/* Disable IRQs while reconfiguring the device.
* This makes it possible to drop the spinlock throughout
* the reconfiguration process. */
spin_lock_irqsave(&wl->irq_lock, flags);
if (b43_status(dev) < B43_STAT_STARTED) {
spin_unlock_irqrestore(&wl->irq_lock, flags);
goto out_unlock_mutex;
}
savedirqs = b43_interrupt_disable(dev, B43_IRQ_ALL);
spin_unlock_irqrestore(&wl->irq_lock, flags);
b43_synchronize_irq(dev);
b43_mac_suspend(dev);
if (changed & BSS_CHANGED_BASIC_RATES)
b43_update_basic_rates(dev, conf->basic_rates);
if (changed & BSS_CHANGED_ERP_SLOT) {
if (conf->use_short_slot)
b43_short_slot_timing_enable(dev);
else
b43_short_slot_timing_disable(dev);
}
b43_mac_enable(dev);
spin_lock_irqsave(&wl->irq_lock, flags);
b43_interrupt_enable(dev, savedirqs);
/* XXX: why? */
mmiowb();
spin_unlock_irqrestore(&wl->irq_lock, flags);
out_unlock_mutex:
mutex_unlock(&wl->mutex);
return;
}
static int b43_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
const u8 *local_addr, const u8 *addr,
struct ieee80211_key_conf *key)
@ -4210,6 +4296,7 @@ static const struct ieee80211_ops b43_hw_ops = {
.add_interface = b43_op_add_interface,
.remove_interface = b43_op_remove_interface,
.config = b43_op_config,
.bss_info_changed = b43_op_bss_info_changed,
.config_interface = b43_op_config_interface,
.configure_filter = b43_op_configure_filter,
.set_key = b43_op_set_key,