package/kernel/mac80211/patches/subsys/312-mac80211-factor-out-code-to-look-up-the-average-pack.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 12 Aug 2020 17:06:12 +0200
   3 Subject: [PATCH] mac80211: factor out code to look up the average packet
   4  length duration for a rate
   5
   6 This will be used to enhance AQL estimated aggregation length
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10
  11 --- a/net/mac80211/airtime.c
  12 +++ b/net/mac80211/airtime.c
  13 @@ -405,18 +405,14 @@ ieee80211_calc_legacy_rate_duration(u16
  14         return duration;
  15  }
  16
  17 -u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
  18 -                             struct ieee80211_rx_status *status,
  19 -                             int len)
  20 +static u32 ieee80211_get_rate_duration(struct ieee80211_hw *hw,
  21 +                                      struct ieee80211_rx_status *status,
  22 +                                      u32 *overhead)
  23  {
  24 -       struct ieee80211_supported_band *sband;
  25 -       const struct ieee80211_rate *rate;
  26         bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI;
  27 -       bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
  28         int bw, streams;
  29         int group, idx;
  30         u32 duration;
  31 -       bool cck;
  32
  33         switch (status->bw) {
  34         case RATE_INFO_BW_20:
  35 @@ -437,20 +433,6 @@ u32 ieee80211_calc_rx_airtime(struct iee
  36         }
  37
  38         switch (status->encoding) {
  39 -       case RX_ENC_LEGACY:
  40 -               if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ))
  41 -                       return 0;
  42 -
  43 -               sband = hw->wiphy->bands[status->band];
  44 -               if (!sband || status->rate_idx >= sband->n_bitrates)
  45 -                       return 0;
  46 -
  47 -               rate = &sband->bitrates[status->rate_idx];
  48 -               cck = rate->flags & IEEE80211_RATE_MANDATORY_B;
  49 -
  50 -               return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp,
  51 -                                                          cck, len);
  52 -
  53         case RX_ENC_VHT:
  54                 streams = status->nss;
  55                 idx = status->rate_idx;
  56 @@ -477,13 +459,47 @@ u32 ieee80211_calc_rx_airtime(struct iee
  57
  58         duration = airtime_mcs_groups[group].duration[idx];
  59         duration <<= airtime_mcs_groups[group].shift;
  60 +       *overhead = 36 + (streams << 2);
  61 +
  62 +       return duration;
  63 +}
  64 +
  65 +
  66 +u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
  67 +                             struct ieee80211_rx_status *status,
  68 +                             int len)
  69 +{
  70 +       struct ieee80211_supported_band *sband;
  71 +       u32 duration, overhead = 0;
  72 +
  73 +       if (status->encoding == RX_ENC_LEGACY) {
  74 +               const struct ieee80211_rate *rate;
  75 +               bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
  76 +               bool cck;
  77 +
  78 +               if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ))
  79 +                       return 0;
  80 +
  81 +               sband = hw->wiphy->bands[status->band];
  82 +               if (!sband || status->rate_idx >= sband->n_bitrates)
  83 +                       return 0;
  84 +
  85 +               rate = &sband->bitrates[status->rate_idx];
  86 +               cck = rate->flags & IEEE80211_RATE_MANDATORY_B;
  87 +
  88 +               return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp,
  89 +                                                          cck, len);
  90 +       }
  91 +
  92 +       duration = ieee80211_get_rate_duration(hw, status, &overhead);
  93 +       if (!duration)
  94 +               return 0;
  95 +
  96         duration *= len;
  97         duration /= AVG_PKT_SIZE;
  98         duration /= 1024;
  99
 100 -       duration += 36 + (streams << 2);
 101 -
 102 -       return duration;
 103 +       return duration + overhead;
 104  }
 105  EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime);
 106
 107 @@ -530,46 +546,57 @@ static bool ieee80211_fill_rate_info(str
 108         return false;
 109  }
 110
 111 -static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
 112 -                                         struct ieee80211_tx_rate *rate,
 113 -                                         struct rate_info *ri,
 114 -                                         u8 band, int len)
 115 +static int ieee80211_fill_rx_status(struct ieee80211_rx_status *stat,
 116 +                                   struct ieee80211_hw *hw,
 117 +                                   struct ieee80211_tx_rate *rate,
 118 +                                   struct rate_info *ri, u8 band, int len)
 119  {
 120 -       struct ieee80211_rx_status stat = {
 121 -               .band = band,
 122 -       };
 123 +       memset(stat, 0, sizeof(*stat));
 124 +       stat->band = band;
 125
 126 -       if (ieee80211_fill_rate_info(hw, &stat, band, ri))
 127 -               goto out;
 128 +       if (ieee80211_fill_rate_info(hw, stat, band, ri))
 129 +               return 0;
 130
 131         if (rate->idx < 0 || !rate->count)
 132 -               return 0;
 133 +               return -1;
 134
 135         if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 136 -               stat.bw = RATE_INFO_BW_80;
 137 +               stat->bw = RATE_INFO_BW_80;
 138         else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 139 -               stat.bw = RATE_INFO_BW_40;
 140 +               stat->bw = RATE_INFO_BW_40;
 141         else
 142 -               stat.bw = RATE_INFO_BW_20;
 143 +               stat->bw = RATE_INFO_BW_20;
 144
 145 -       stat.enc_flags = 0;
 146 +       stat->enc_flags = 0;
 147         if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 148 -               stat.enc_flags |= RX_ENC_FLAG_SHORTPRE;
 149 +               stat->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 150         if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
 151 -               stat.enc_flags |= RX_ENC_FLAG_SHORT_GI;
 152 +               stat->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 153
 154 -       stat.rate_idx = rate->idx;
 155 +       stat->rate_idx = rate->idx;
 156         if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
 157 -               stat.encoding = RX_ENC_VHT;
 158 -               stat.rate_idx = ieee80211_rate_get_vht_mcs(rate);
 159 -               stat.nss = ieee80211_rate_get_vht_nss(rate);
 160 +               stat->encoding = RX_ENC_VHT;
 161 +               stat->rate_idx = ieee80211_rate_get_vht_mcs(rate);
 162 +               stat->nss = ieee80211_rate_get_vht_nss(rate);
 163         } else if (rate->flags & IEEE80211_TX_RC_MCS) {
 164 -               stat.encoding = RX_ENC_HT;
 165 +               stat->encoding = RX_ENC_HT;
 166         } else {
 167 -               stat.encoding = RX_ENC_LEGACY;
 168 +               stat->encoding = RX_ENC_LEGACY;
 169         }
 170
 171 -out:
 172 +       return 0;
 173 +}
 174 +
 175 +static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
 176 +                                         struct ieee80211_tx_rate *rate,
 177 +                                         struct rate_info *ri,
 178 +                                         u8 band, int len)
 179 +{
 180 +       struct ieee80211_rx_status stat;
 181 +
 182 +       if (ieee80211_fill_rx_status(&stat, hw, rate, ri, band, len))
 183 +               return 0;
 184 +
 185         return ieee80211_calc_rx_airtime(hw, &stat, len);
 186  }
 187