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From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 23 Jan 2020 14:10:20 +0100
Subject: [PATCH] driver_nl80211: fix regulatory limits for wmm cwmin/cwmax
values
The internal WMM AC parameters use just the exponent of the CW value, while
nl80211 reports the full CW value.
This led to completely bogus CWmin/CWmax values in the WMM IE when a regulatory
limit was present. Fix this by converting the value to the exponent before
passing it on
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/src/drivers/driver_nl80211_capa.c
+++ b/src/drivers/driver_nl80211_capa.c
@@ -1336,6 +1336,18 @@ static void phy_info_vht_capa(struct hos
}
}
+static inline int cw2ecw(unsigned int cw)
+{
+ int bit;
+
+ if (cw == 0)
+ return 0;
+
+ for (bit = 1; cw != 1; bit++)
+ cw >>= 1;
+
+ return bit;
+}
static void phy_info_freq(struct hostapd_hw_modes *mode,
struct hostapd_channel_data *chan,
@@ -1438,9 +1450,9 @@ static void phy_info_freq(struct hostapd
ac = wmm_map[ac];
chan->wmm_rules[ac].min_cwmin =
- nla_get_u16(tb_wmm[NL80211_WMMR_CW_MIN]);
+ cw2ecw(nla_get_u16(tb_wmm[NL80211_WMMR_CW_MIN]));
chan->wmm_rules[ac].min_cwmax =
- nla_get_u16(tb_wmm[NL80211_WMMR_CW_MAX]);
+ cw2ecw(nla_get_u16(tb_wmm[NL80211_WMMR_CW_MAX]));
chan->wmm_rules[ac].min_aifs =
nla_get_u8(tb_wmm[NL80211_WMMR_AIFSN]);
chan->wmm_rules[ac].max_txop =
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