From: Lorenzo Bianconi Date: Tue, 16 Nov 2021 15:03:36 +0100 Subject: [PATCH] cfg80211: allow continuous radar monitoring on offchannel chain Allow continuous radar detection on the offchannel chain in order to switch to the monitored channel whenever the underlying driver reports a radar pattern on the main channel. Tested-by: Owen Peng Signed-off-by: Lorenzo Bianconi Link: https://lore.kernel.org/r/d46217310a49b14ff0e9c002f0a6e0547d70fd2c.1637071350.git.lorenzo@kernel.org Signed-off-by: Johannes Berg --- --- a/net/wireless/chan.c +++ b/net/wireless/chan.c @@ -712,6 +712,19 @@ static bool cfg80211_is_wiphy_oper_chan( return false; } +static bool +cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev, + struct ieee80211_channel *channel) +{ + if (!rdev->offchan_radar_wdev) + return false; + + if (!cfg80211_chandef_valid(&rdev->offchan_radar_chandef)) + return false; + + return cfg80211_is_sub_chan(&rdev->offchan_radar_chandef, channel); +} + bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, struct ieee80211_channel *chan) { @@ -728,6 +741,9 @@ bool cfg80211_any_wiphy_oper_chan(struct if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan)) return true; + + if (cfg80211_offchan_chain_is_active(rdev, chan)) + return true; } return false; --- a/net/wireless/mlme.c +++ b/net/wireless/mlme.c @@ -988,7 +988,7 @@ __cfg80211_offchan_cac_event(struct cfg8 if (!cfg80211_chandef_valid(chandef)) return; - if (event != NL80211_RADAR_CAC_STARTED && !rdev->offchan_radar_wdev) + if (!rdev->offchan_radar_wdev) return; switch (event) { @@ -998,17 +998,13 @@ __cfg80211_offchan_cac_event(struct cfg8 queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk); cfg80211_sched_dfs_chan_update(rdev); wdev = rdev->offchan_radar_wdev; - rdev->offchan_radar_wdev = NULL; break; case NL80211_RADAR_CAC_ABORTED: if (!cancel_delayed_work(&rdev->offchan_cac_done_wk)) return; wdev = rdev->offchan_radar_wdev; - rdev->offchan_radar_wdev = NULL; break; case NL80211_RADAR_CAC_STARTED: - WARN_ON(!wdev); - rdev->offchan_radar_wdev = wdev; break; default: return; @@ -1024,7 +1020,8 @@ cfg80211_offchan_cac_event(struct cfg802 enum nl80211_radar_event event) { wiphy_lock(&rdev->wiphy); - __cfg80211_offchan_cac_event(rdev, NULL, chandef, event); + __cfg80211_offchan_cac_event(rdev, rdev->offchan_radar_wdev, + chandef, event); wiphy_unlock(&rdev->wiphy); } @@ -1071,7 +1068,13 @@ cfg80211_start_offchan_radar_detection(s NL80211_EXT_FEATURE_RADAR_OFFCHAN)) return -EOPNOTSUPP; - if (rdev->offchan_radar_wdev) + /* Offchannel chain already locked by another wdev */ + if (rdev->offchan_radar_wdev && rdev->offchan_radar_wdev != wdev) + return -EBUSY; + + /* CAC already in progress on the offchannel chain */ + if (rdev->offchan_radar_wdev == wdev && + delayed_work_pending(&rdev->offchan_cac_done_wk)) return -EBUSY; err = rdev_set_radar_offchan(rdev, chandef); @@ -1083,6 +1086,8 @@ cfg80211_start_offchan_radar_detection(s cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS; rdev->offchan_radar_chandef = *chandef; + rdev->offchan_radar_wdev = wdev; /* Get offchain ownership */ + __cfg80211_offchan_cac_event(rdev, wdev, chandef, NL80211_RADAR_CAC_STARTED); queue_delayed_work(cfg80211_wq, &rdev->offchan_cac_done_wk, @@ -1102,6 +1107,7 @@ void cfg80211_stop_offchan_radar_detecti return; rdev_set_radar_offchan(rdev, NULL); + rdev->offchan_radar_wdev = NULL; /* Release offchain ownership */ __cfg80211_offchan_cac_event(rdev, wdev, &rdev->offchan_radar_chandef, NL80211_RADAR_CAC_ABORTED); --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -9278,42 +9278,60 @@ static int nl80211_start_radar_detection struct cfg80211_chan_def chandef; enum nl80211_dfs_regions dfs_region; unsigned int cac_time_ms; - int err; + int err = -EINVAL; + + flush_delayed_work(&rdev->dfs_update_channels_wk); + + wiphy_lock(wiphy); dfs_region = reg_get_dfs_region(wiphy); if (dfs_region == NL80211_DFS_UNSET) - return -EINVAL; + goto unlock; err = nl80211_parse_chandef(rdev, info, &chandef); if (err) - return err; + goto unlock; err = cfg80211_chandef_dfs_required(wiphy, &chandef, wdev->iftype); if (err < 0) - return err; + goto unlock; - if (err == 0) - return -EINVAL; + if (err == 0) { + err = -EINVAL; + goto unlock; + } - if (!cfg80211_chandef_dfs_usable(wiphy, &chandef)) - return -EINVAL; + if (!cfg80211_chandef_dfs_usable(wiphy, &chandef)) { + err = -EINVAL; + goto unlock; + } - if (nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN])) - return cfg80211_start_offchan_radar_detection(rdev, wdev, - &chandef); + if (nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN])) { + err = cfg80211_start_offchan_radar_detection(rdev, wdev, + &chandef); + goto unlock; + } - if (netif_carrier_ok(dev)) - return -EBUSY; + if (netif_carrier_ok(dev)) { + err = -EBUSY; + goto unlock; + } - if (wdev->cac_started) - return -EBUSY; + if (wdev->cac_started) { + err = -EBUSY; + goto unlock; + } /* CAC start is offloaded to HW and can't be started manually */ - if (wiphy_ext_feature_isset(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD)) - return -EOPNOTSUPP; + if (wiphy_ext_feature_isset(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD)) { + err = -EOPNOTSUPP; + goto unlock; + } - if (!rdev->ops->start_radar_detection) - return -EOPNOTSUPP; + if (!rdev->ops->start_radar_detection) { + err = -EOPNOTSUPP; + goto unlock; + } cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, &chandef); if (WARN_ON(!cac_time_ms)) @@ -9326,6 +9344,9 @@ static int nl80211_start_radar_detection wdev->cac_start_time = jiffies; wdev->cac_time_ms = cac_time_ms; } +unlock: + wiphy_unlock(wiphy); + return err; } @@ -15961,7 +15982,8 @@ static const struct genl_small_ops nl802 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = nl80211_start_radar_detection, .flags = GENL_UNS_ADMIN_PERM, - .internal_flags = NL80211_FLAG_NEED_NETDEV_UP, + .internal_flags = NL80211_FLAG_NEED_NETDEV_UP | + NL80211_FLAG_NO_WIPHY_MTX, }, { .cmd = NL80211_CMD_GET_PROTOCOL_FEATURES,