From a0497f9f57478c5a37c5628eb32833dd9729a821 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 13 Feb 2013 10:51:08 +0100 Subject: mac80211/minstrel_ht: add support for using CCK rates When MCS rates start to get bad in 2.4 GHz because of long range or strong interference, CCK rates can be a lot more robust. This patch adds a pseudo MCS group containing CCK rates (long preamble in the lower 4 slots, short preamble in the upper slots). Signed-off-by: Felix Fietkau [make minstrel_ht_get_stats static] Signed-off-by: Johannes Berg --- net/mac80211/rc80211_minstrel.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'net/mac80211/rc80211_minstrel.c') diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c index 8c5acdc06226..eea45a2c7c35 100644 --- a/net/mac80211/rc80211_minstrel.c +++ b/net/mac80211/rc80211_minstrel.c @@ -494,6 +494,33 @@ minstrel_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) kfree(mi); } +static void +minstrel_init_cck_rates(struct minstrel_priv *mp) +{ + static const int bitrates[4] = { 10, 20, 55, 110 }; + struct ieee80211_supported_band *sband; + int i, j; + + sband = mp->hw->wiphy->bands[IEEE80211_BAND_2GHZ]; + if (!sband) + return; + + for (i = 0, j = 0; i < sband->n_bitrates; i++) { + struct ieee80211_rate *rate = &sband->bitrates[i]; + + if (rate->flags & IEEE80211_RATE_ERP_G) + continue; + + for (j = 0; j < ARRAY_SIZE(bitrates); j++) { + if (rate->bitrate != bitrates[j]) + continue; + + mp->cck_rates[j] = i; + break; + } + } +} + static void * minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) { @@ -539,6 +566,8 @@ minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) S_IRUGO | S_IWUGO, debugfsdir, &mp->fixed_rate_idx); #endif + minstrel_init_cck_rates(mp); + return mp; } -- cgit v1.2.3