package/network/services/hostapd/patches/071-driver_nl80211-fix-regulatory-limits-for-wmm-cwmin-c.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 23 Jan 2020 14:10:20 +0100
   3 Subject: [PATCH] driver_nl80211: fix regulatory limits for wmm cwmin/cwmax
   4  values
   5
   6 The internal WMM AC parameters use just the exponent of the CW value, while
   7 nl80211 reports the full CW value.
   8 This led to completely bogus CWmin/CWmax values in the WMM IE when a regulatory
   9 limit was present. Fix this by converting the value to the exponent before
  10 passing it on
  11
  12 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  13 ---
  14
  15 --- a/src/drivers/driver_nl80211_capa.c
  16 +++ b/src/drivers/driver_nl80211_capa.c
  17 @@ -1336,6 +1336,18 @@ static void phy_info_vht_capa(struct hos
  18         }
  19  }
  20
  21 +static inline int cw2ecw(unsigned int cw)
  22 +{
  23 +       int bit;
  24 +
  25 +       if (cw == 0)
  26 +               return 0;
  27 +
  28 +       for (bit = 1; cw != 1; bit++)
  29 +               cw >>= 1;
  30 +
  31 +       return bit;
  32 +}
  33
  34  static void phy_info_freq(struct hostapd_hw_modes *mode,
  35                           struct hostapd_channel_data *chan,
  36 @@ -1438,9 +1450,9 @@ static void phy_info_freq(struct hostapd
  37
  38                         ac = wmm_map[ac];
  39                         chan->wmm_rules[ac].min_cwmin =
  40 -                               nla_get_u16(tb_wmm[NL80211_WMMR_CW_MIN]);
  41 +                               cw2ecw(nla_get_u16(tb_wmm[NL80211_WMMR_CW_MIN]));
  42                         chan->wmm_rules[ac].min_cwmax =
  43 -                               nla_get_u16(tb_wmm[NL80211_WMMR_CW_MAX]);
  44 +                               cw2ecw(nla_get_u16(tb_wmm[NL80211_WMMR_CW_MAX]));
  45                         chan->wmm_rules[ac].min_aifs =
  46                                 nla_get_u8(tb_wmm[NL80211_WMMR_AIFSN]);
  47                         chan->wmm_rules[ac].max_txop =