package/kernel/mac80211/patches/subsys/318-v5.17-cfg80211-allow-continuous-radar-monitoring-on-offcha.patch

   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Tue, 16 Nov 2021 15:03:36 +0100
   3 Subject: [PATCH] cfg80211: allow continuous radar monitoring on offchannel
   4  chain
   5
   6 Allow continuous radar detection on the offchannel chain in order
   7 to switch to the monitored channel whenever the underlying driver
   8 reports a radar pattern on the main channel.
   9
  10 Tested-by: Owen Peng <owen.peng@mediatek.com>
  11 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  12 Link: https://lore.kernel.org/r/d46217310a49b14ff0e9c002f0a6e0547d70fd2c.1637071350.git.lorenzo@kernel.org
  13 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  14 ---
  15
  16 --- a/net/wireless/chan.c
  17 +++ b/net/wireless/chan.c
  18 @@ -712,6 +712,19 @@ static bool cfg80211_is_wiphy_oper_chan(
  19         return false;
  20  }
  21
  22 +static bool
  23 +cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev,
  24 +                                struct ieee80211_channel *channel)
  25 +{
  26 +       if (!rdev->offchan_radar_wdev)
  27 +               return false;
  28 +
  29 +       if (!cfg80211_chandef_valid(&rdev->offchan_radar_chandef))
  30 +               return false;
  31 +
  32 +       return cfg80211_is_sub_chan(&rdev->offchan_radar_chandef, channel);
  33 +}
  34 +
  35  bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
  36                                   struct ieee80211_channel *chan)
  37  {
  38 @@ -728,6 +741,9 @@ bool cfg80211_any_wiphy_oper_chan(struct
  39
  40                 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
  41                         return true;
  42 +
  43 +               if (cfg80211_offchan_chain_is_active(rdev, chan))
  44 +                       return true;
  45         }
  46
  47         return false;
  48 --- a/net/wireless/mlme.c
  49 +++ b/net/wireless/mlme.c
  50 @@ -988,7 +988,7 @@ __cfg80211_offchan_cac_event(struct cfg8
  51         if (!cfg80211_chandef_valid(chandef))
  52                 return;
  53
  54 -       if (event != NL80211_RADAR_CAC_STARTED && !rdev->offchan_radar_wdev)
  55 +       if (!rdev->offchan_radar_wdev)
  56                 return;
  57
  58         switch (event) {
  59 @@ -998,17 +998,13 @@ __cfg80211_offchan_cac_event(struct cfg8
  60                 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
  61                 cfg80211_sched_dfs_chan_update(rdev);
  62                 wdev = rdev->offchan_radar_wdev;
  63 -               rdev->offchan_radar_wdev = NULL;
  64                 break;
  65         case NL80211_RADAR_CAC_ABORTED:
  66                 if (!cancel_delayed_work(&rdev->offchan_cac_done_wk))
  67                         return;
  68                 wdev = rdev->offchan_radar_wdev;
  69 -               rdev->offchan_radar_wdev = NULL;
  70                 break;
  71         case NL80211_RADAR_CAC_STARTED:
  72 -               WARN_ON(!wdev);
  73 -               rdev->offchan_radar_wdev = wdev;
  74                 break;
  75         default:
  76                 return;
  77 @@ -1024,7 +1020,8 @@ cfg80211_offchan_cac_event(struct cfg802
  78                            enum nl80211_radar_event event)
  79  {
  80         wiphy_lock(&rdev->wiphy);
  81 -       __cfg80211_offchan_cac_event(rdev, NULL, chandef, event);
  82 +       __cfg80211_offchan_cac_event(rdev, rdev->offchan_radar_wdev,
  83 +                                    chandef, event);
  84         wiphy_unlock(&rdev->wiphy);
  85  }
  86
  87 @@ -1071,7 +1068,13 @@ cfg80211_start_offchan_radar_detection(s
  88                                      NL80211_EXT_FEATURE_RADAR_OFFCHAN))
  89                 return -EOPNOTSUPP;
  90
  91 -       if (rdev->offchan_radar_wdev)
  92 +       /* Offchannel chain already locked by another wdev */
  93 +       if (rdev->offchan_radar_wdev && rdev->offchan_radar_wdev != wdev)
  94 +               return -EBUSY;
  95 +
  96 +       /* CAC already in progress on the offchannel chain */
  97 +       if (rdev->offchan_radar_wdev == wdev &&
  98 +           delayed_work_pending(&rdev->offchan_cac_done_wk))
  99                 return -EBUSY;
 100
 101         err = rdev_set_radar_offchan(rdev, chandef);
 102 @@ -1083,6 +1086,8 @@ cfg80211_start_offchan_radar_detection(s
 103                 cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
 104
 105         rdev->offchan_radar_chandef = *chandef;
 106 +       rdev->offchan_radar_wdev = wdev; /* Get offchain ownership */
 107 +
 108         __cfg80211_offchan_cac_event(rdev, wdev, chandef,
 109                                      NL80211_RADAR_CAC_STARTED);
 110         queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_done_wk,
 111 @@ -1102,6 +1107,7 @@ void cfg80211_stop_offchan_radar_detecti
 112                 return;
 113
 114         rdev_set_radar_offchan(rdev, NULL);
 115 +       rdev->offchan_radar_wdev = NULL; /* Release offchain ownership */
 116
 117         __cfg80211_offchan_cac_event(rdev, wdev, &rdev->offchan_radar_chandef,
 118                                      NL80211_RADAR_CAC_ABORTED);
 119 --- a/net/wireless/nl80211.c
 120 +++ b/net/wireless/nl80211.c
 121 @@ -9278,42 +9278,60 @@ static int nl80211_start_radar_detection
 122         struct cfg80211_chan_def chandef;
 123         enum nl80211_dfs_regions dfs_region;
 124         unsigned int cac_time_ms;
 125 -       int err;
 126 +       int err = -EINVAL;
 127 +
 128 +       flush_delayed_work(&rdev->dfs_update_channels_wk);
 129 +
 130 +       wiphy_lock(wiphy);
 131
 132         dfs_region = reg_get_dfs_region(wiphy);
 133         if (dfs_region == NL80211_DFS_UNSET)
 134 -               return -EINVAL;
 135 +               goto unlock;
 136
 137         err = nl80211_parse_chandef(rdev, info, &chandef);
 138         if (err)
 139 -               return err;
 140 +               goto unlock;
 141
 142         err = cfg80211_chandef_dfs_required(wiphy, &chandef, wdev->iftype);
 143         if (err < 0)
 144 -               return err;
 145 +               goto unlock;
 146
 147 -       if (err == 0)
 148 -               return -EINVAL;
 149 +       if (err == 0) {
 150 +               err = -EINVAL;
 151 +               goto unlock;
 152 +       }
 153
 154 -       if (!cfg80211_chandef_dfs_usable(wiphy, &chandef))
 155 -               return -EINVAL;
 156 +       if (!cfg80211_chandef_dfs_usable(wiphy, &chandef)) {
 157 +               err = -EINVAL;
 158 +               goto unlock;
 159 +       }
 160
 161 -       if (nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN]))
 162 -               return cfg80211_start_offchan_radar_detection(rdev, wdev,
 163 -                                                             &chandef);
 164 +       if (nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN])) {
 165 +               err = cfg80211_start_offchan_radar_detection(rdev, wdev,
 166 +                                                            &chandef);
 167 +               goto unlock;
 168 +       }
 169
 170 -       if (netif_carrier_ok(dev))
 171 -               return -EBUSY;
 172 +       if (netif_carrier_ok(dev)) {
 173 +               err = -EBUSY;
 174 +               goto unlock;
 175 +       }
 176
 177 -       if (wdev->cac_started)
 178 -               return -EBUSY;
 179 +       if (wdev->cac_started) {
 180 +               err = -EBUSY;
 181 +               goto unlock;
 182 +       }
 183
 184         /* CAC start is offloaded to HW and can't be started manually */
 185 -       if (wiphy_ext_feature_isset(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD))
 186 -               return -EOPNOTSUPP;
 187 +       if (wiphy_ext_feature_isset(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD)) {
 188 +               err = -EOPNOTSUPP;
 189 +               goto unlock;
 190 +       }
 191
 192 -       if (!rdev->ops->start_radar_detection)
 193 -               return -EOPNOTSUPP;
 194 +       if (!rdev->ops->start_radar_detection) {
 195 +               err = -EOPNOTSUPP;
 196 +               goto unlock;
 197 +       }
 198
 199         cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, &chandef);
 200         if (WARN_ON(!cac_time_ms))
 201 @@ -9326,6 +9344,9 @@ static int nl80211_start_radar_detection
 202                 wdev->cac_start_time = jiffies;
 203                 wdev->cac_time_ms = cac_time_ms;
 204         }
 205 +unlock:
 206 +       wiphy_unlock(wiphy);
 207 +
 208         return err;
 209  }
 210
 211 @@ -15961,7 +15982,8 @@ static const struct genl_small_ops nl802
 212                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 213                 .doit = nl80211_start_radar_detection,
 214                 .flags = GENL_UNS_ADMIN_PERM,
 215 -               .internal_flags = NL80211_FLAG_NEED_NETDEV_UP,
 216 +               .internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
 217 +                                 NL80211_FLAG_NO_WIPHY_MTX,
 218         },
 219         {
 220                 .cmd = NL80211_CMD_GET_PROTOCOL_FEATURES,