package/kernel/mac80211/patches/334-mac80211-minstrel_ht-move-supported-bitrate-mask-out.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 14 Dec 2016 19:33:23 +0100
   3 Subject: [PATCH] mac80211: minstrel_ht: move supported bitrate mask out of
   4  group data
   5
   6 Improves dcache footprint by ensuring that fewer cache lines need to be
   7 touched.
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/net/mac80211/rc80211_minstrel_ht.c
  13 +++ b/net/mac80211/rc80211_minstrel_ht.c
  14 @@ -301,7 +301,7 @@ minstrel_ht_get_stats(struct minstrel_pr
  15                                 break;
  16
  17                 /* short preamble */
  18 -               if (!(mi->groups[group].supported & BIT(idx)))
  19 +               if (!(mi->supported[group] & BIT(idx)))
  20                         idx += 4;
  21         }
  22         return &mi->groups[group].rates[idx];
  23 @@ -486,7 +486,7 @@ minstrel_ht_prob_rate_reduce_streams(str
  24                           MCS_GROUP_RATES].streams;
  25         for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
  26                 mg = &mi->groups[group];
  27 -               if (!mg->supported || group == MINSTREL_CCK_GROUP)
  28 +               if (!mi->supported[group] || group == MINSTREL_CCK_GROUP)
  29                         continue;
  30
  31                 tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES;
  32 @@ -540,7 +540,7 @@ minstrel_ht_update_stats(struct minstrel
  33         for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
  34
  35                 mg = &mi->groups[group];
  36 -               if (!mg->supported)
  37 +               if (!mi->supported[group])
  38                         continue;
  39
  40                 mi->sample_count++;
  41 @@ -550,7 +550,7 @@ minstrel_ht_update_stats(struct minstrel
  42                         tmp_group_tp_rate[j] = group;
  43
  44                 for (i = 0; i < MCS_GROUP_RATES; i++) {
  45 -                       if (!(mg->supported & BIT(i)))
  46 +                       if (!(mi->supported[group] & BIT(i)))
  47                                 continue;
  48
  49                         index = MCS_GROUP_RATES * group + i;
  50 @@ -636,7 +636,7 @@ minstrel_set_next_sample_idx(struct mins
  51                 mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups);
  52                 mg = &mi->groups[mi->sample_group];
  53
  54 -               if (!mg->supported)
  55 +               if (!mi->supported[mi->sample_group])
  56                         continue;
  57
  58                 if (++mg->index >= MCS_GROUP_RATES) {
  59 @@ -657,7 +657,7 @@ minstrel_downgrade_rate(struct minstrel_
  60         while (group > 0) {
  61                 group--;
  62
  63 -               if (!mi->groups[group].supported)
  64 +               if (!mi->supported[group])
  65                         continue;
  66
  67                 if (minstrel_mcs_groups[group].streams >
  68 @@ -994,7 +994,7 @@ minstrel_get_sample_rate(struct minstrel
  69         sample_idx = sample_table[mg->column][mg->index];
  70         minstrel_set_next_sample_idx(mi);
  71
  72 -       if (!(mg->supported & BIT(sample_idx)))
  73 +       if (!(mi->supported[sample_group] & BIT(sample_idx)))
  74                 return -1;
  75
  76         mrs = &mg->rates[sample_idx];
  77 @@ -1052,7 +1052,7 @@ static void
  78  minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp,
  79                                     struct minstrel_ht_sta *mi, bool val)
  80  {
  81 -       u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported;
  82 +       u8 supported = mi->supported[MINSTREL_CCK_GROUP];
  83
  84         if (!supported || !mi->cck_supported_short)
  85                 return;
  86 @@ -1061,7 +1061,7 @@ minstrel_ht_check_cck_shortpreamble(stru
  87                 return;
  88
  89         supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4);
  90 -       mi->groups[MINSTREL_CCK_GROUP].supported = supported;
  91 +       mi->supported[MINSTREL_CCK_GROUP] = supported;
  92  }
  93
  94  static void
  95 @@ -1154,7 +1154,7 @@ minstrel_ht_update_cck(struct minstrel_p
  96                         mi->cck_supported_short |= BIT(i);
  97         }
  98
  99 -       mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported;
 100 +       mi->supported[MINSTREL_CCK_GROUP] = mi->cck_supported;
 101  }
 102
 103  static void
 104 @@ -1233,7 +1233,7 @@ minstrel_ht_update_caps(void *priv, stru
 105                 u32 gflags = minstrel_mcs_groups[i].flags;
 106                 int bw, nss;
 107
 108 -               mi->groups[i].supported = 0;
 109 +               mi->supported[i] = 0;
 110                 if (i == MINSTREL_CCK_GROUP) {
 111                         minstrel_ht_update_cck(mp, mi, sband, sta);
 112                         continue;
 113 @@ -1265,8 +1265,8 @@ minstrel_ht_update_caps(void *priv, stru
 114                         if (use_vht && minstrel_vht_only)
 115                                 continue;
 116  #endif
 117 -                       mi->groups[i].supported = mcs->rx_mask[nss - 1];
 118 -                       if (mi->groups[i].supported)
 119 +                       mi->supported[i] = mcs->rx_mask[nss - 1];
 120 +                       if (mi->supported[i])
 121                                 n_supported++;
 122                         continue;
 123                 }
 124 @@ -1292,10 +1292,10 @@ minstrel_ht_update_caps(void *priv, stru
 125                 else
 126                         bw = BW_20;
 127
 128 -               mi->groups[i].supported = minstrel_get_valid_vht_rates(bw, nss,
 129 +               mi->supported[i] = minstrel_get_valid_vht_rates(bw, nss,
 130                                 vht_cap->vht_mcs.tx_mcs_map);
 131
 132 -               if (mi->groups[i].supported)
 133 +               if (mi->supported[i])
 134                         n_supported++;
 135         }
 136
 137 --- a/net/mac80211/rc80211_minstrel_ht.h
 138 +++ b/net/mac80211/rc80211_minstrel_ht.h
 139 @@ -52,9 +52,6 @@ struct minstrel_mcs_group_data {
 140         u8 index;
 141         u8 column;
 142
 143 -       /* bitfield of supported MCS rates of this group */
 144 -       u16 supported;
 145 -
 146         /* sorted rate set within a MCS group*/
 147         u16 max_group_tp_rate[MAX_THR_RATES];
 148         u16 max_group_prob_rate;
 149 @@ -101,6 +98,9 @@ struct minstrel_ht_sta {
 150         u8 cck_supported;
 151         u8 cck_supported_short;
 152
 153 +       /* Bitfield of supported MCS rates of all groups */
 154 +       u16 supported[MINSTREL_GROUPS_NB];
 155 +
 156         /* MCS rate group info and statistics */
 157         struct minstrel_mcs_group_data groups[MINSTREL_GROUPS_NB];
 158  };
 159 --- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
 160 +++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
 161 @@ -24,7 +24,7 @@ minstrel_ht_stats_dump(struct minstrel_h
 162         char gimode = 'L';
 163         u32 gflags;
 164
 165 -       if (!mi->groups[i].supported)
 166 +       if (!mi->supported[i])
 167                 return p;
 168
 169         mg = &minstrel_mcs_groups[i];
 170 @@ -42,7 +42,7 @@ minstrel_ht_stats_dump(struct minstrel_h
 171                 static const int bitrates[4] = { 10, 20, 55, 110 };
 172                 int idx = i * MCS_GROUP_RATES + j;
 173
 174 -               if (!(mi->groups[i].supported & BIT(j)))
 175 +               if (!(mi->supported[i] & BIT(j)))
 176                         continue;
 177
 178                 if (gflags & IEEE80211_TX_RC_MCS) {
 179 @@ -170,7 +170,7 @@ minstrel_ht_stats_csv_dump(struct minstr
 180         char gimode = 'L';
 181         u32 gflags;
 182
 183 -       if (!mi->groups[i].supported)
 184 +       if (!mi->supported[i])
 185                 return p;
 186
 187         mg = &minstrel_mcs_groups[i];
 188 @@ -188,7 +188,7 @@ minstrel_ht_stats_csv_dump(struct minstr
 189                 static const int bitrates[4] = { 10, 20, 55, 110 };
 190                 int idx = i * MCS_GROUP_RATES + j;
 191
 192 -               if (!(mi->groups[i].supported & BIT(j)))
 193 +               if (!(mi->supported[i] & BIT(j)))
 194                         continue;
 195
 196                 if (gflags & IEEE80211_TX_RC_MCS) {