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cfg80211/mac80211: Use more generic bitrate mask for rate control

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Extend struct cfg80211_bitrate_mask to actually use a bitfield mask
instead of just a single fixed or maximum rate index. This change
itself does not modify the behavior (except for debugfs files), but it
prepares cfg80211 and mac80211 for a new nl80211 command for setting
which rates can be used in TX rate control.

Since frames are now going through the rate control algorithm
unconditionally, the internal IEEE80211_TX_INTFL_RCALGO flag can now
be removed. The RC implementations can use the rate_idx_mask value to
optimize their behavior if only a single rate is enabled.

The old max_rate_idx in struct ieee80211_tx_rate_control is maintained
(but commented as deprecated) for backwards compatibility with existing
RC implementations. Once these implementations have been updated to
use the more generic rate_idx_mask, the max_rate_idx value can be
removed.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen
2010-01-06 13:09:08 +02:00
committed by John W. Linville
parent e00cfce0cb
commit 37eb0b164c
10 changed files with 122 additions and 79 deletions
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32
net/mac80211/cfg.c
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@@ -1406,8 +1406,6 @@ static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
int i;
u32 target_rate;
struct ieee80211_supported_band *sband;
/*
* This _could_ be supported by providing a hook for
@@ -1417,35 +1415,11 @@ static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
return -EOPNOTSUPP;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
/*
* target_rate = -1, rate->fixed = 0 means auto only, so use all rates
* target_rate = X, rate->fixed = 1 means only rate X
* target_rate = X, rate->fixed = 0 means all rates <= X
*/
sdata->max_ratectrl_rateidx = -1;
sdata->force_unicast_rateidx = -1;
for (i = 0; i < IEEE80211_NUM_BANDS; i++)
sdata->rc_rateidx_mask[i] = mask->control[i].legacy;
if (mask->fixed)
target_rate = mask->fixed / 100;
else if (mask->maxrate)
target_rate = mask->maxrate / 100;
else
return 0;
for (i = 0; i< sband->n_bitrates; i++) {
if (target_rate != sband->bitrates[i].bitrate)
continue;
/* requested bitrate found */
sdata->max_ratectrl_rateidx = i;
if (mask->fixed)
sdata->force_unicast_rateidx = i;
return 0;
}
return -EINVAL;
return 0;
}
static int ieee80211_remain_on_channel(struct wiphy *wiphy,