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author | Jouni Malinen <jouni.malinen@atheros.com> | 2010-01-06 13:09:08 +0200 |
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committer | John W. Linville <linville@tuxdriver.com> | 2010-01-12 13:50:11 -0500 |
commit | 37eb0b164cf9fa9f70c8500926f5cde7c652f48e (patch) | |
tree | 9260e7045f32268c8c4ded718677711d371cd5ed /net/mac80211/rate.c | |
parent | e00cfce0cb2a397859607bf515c6de9ce064b64a (diff) | |
download | kernel_samsung_espresso10-37eb0b164cf9fa9f70c8500926f5cde7c652f48e.zip kernel_samsung_espresso10-37eb0b164cf9fa9f70c8500926f5cde7c652f48e.tar.gz kernel_samsung_espresso10-37eb0b164cf9fa9f70c8500926f5cde7c652f48e.tar.bz2 |
cfg80211/mac80211: Use more generic bitrate mask for rate control
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>
Diffstat (limited to 'net/mac80211/rate.c')
-rw-r--r-- | net/mac80211/rate.c | 63 |
1 files changed, 52 insertions, 11 deletions
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c index 6349e7f..c74b7c8 100644 --- a/net/mac80211/rate.c +++ b/net/mac80211/rate.c @@ -249,6 +249,38 @@ bool rate_control_send_low(struct ieee80211_sta *sta, } EXPORT_SYMBOL(rate_control_send_low); +static void rate_idx_match_mask(struct ieee80211_tx_rate *rate, + int n_bitrates, u32 mask) +{ + int j; + + /* See whether the selected rate or anything below it is allowed. */ + for (j = rate->idx; j >= 0; j--) { + if (mask & (1 << j)) { + /* Okay, found a suitable rate. Use it. */ + rate->idx = j; + return; + } + } + + /* Try to find a higher rate that would be allowed */ + for (j = rate->idx + 1; j < n_bitrates; j++) { + if (mask & (1 << j)) { + /* Okay, found a suitable rate. Use it. */ + rate->idx = j; + return; + } + } + + /* + * Uh.. No suitable rate exists. This should not really happen with + * sane TX rate mask configurations. However, should someone manage to + * configure supported rates and TX rate mask in incompatible way, + * allow the frame to be transmitted with whatever the rate control + * selected. + */ +} + void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, struct ieee80211_tx_rate_control *txrc) @@ -258,6 +290,7 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, struct ieee80211_sta *ista = NULL; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); int i; + u32 mask; if (sta) { ista = &sta->sta; @@ -270,23 +303,31 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, info->control.rates[i].count = 1; } - if (sta && sdata->force_unicast_rateidx > -1) { - info->control.rates[0].idx = sdata->force_unicast_rateidx; - } else { - ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); - info->flags |= IEEE80211_TX_INTFL_RCALGO; - } + ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); /* - * try to enforce the maximum rate the user wanted + * Try to enforce the rateidx mask the user wanted. skip this if the + * default mask (allow all rates) is used to save some processing for + * the common case. */ - if (sdata->max_ratectrl_rateidx > -1) + mask = sdata->rc_rateidx_mask[info->band]; + if (mask != (1 << txrc->sband->n_bitrates) - 1) { + if (sta) { + /* Filter out rates that the STA does not support */ + mask &= sta->sta.supp_rates[info->band]; + } + /* + * Make sure the rate index selected for each TX rate is + * included in the configured mask and change the rate indexes + * if needed. + */ for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { + /* Rate masking supports only legacy rates for now */ if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) continue; - info->control.rates[i].idx = - min_t(s8, info->control.rates[i].idx, - sdata->max_ratectrl_rateidx); + rate_idx_match_mask(&info->control.rates[i], + txrc->sband->n_bitrates, mask); + } } BUG_ON(info->control.rates[0].idx < 0); |