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318-cfg80211-allow-continuous-radar-monitoring-on-offcha.patch
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318-cfg80211-allow-continuous-radar-monitoring-on-offcha.patch
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From: Lorenzo Bianconi <lorenzo@kernel.org>
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 <owen.peng@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/d46217310a49b14ff0e9c002f0a6e0547d70fd2c.1637071350.git.lorenzo@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
--- 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
@@ -9263,42 +9263,60 @@ 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))
@@ -9311,6 +9329,9 @@ static int nl80211_start_radar_detection
wdev->cac_start_time = jiffies;
wdev->cac_time_ms = cac_time_ms;
}
+unlock:
+ wiphy_unlock(wiphy);
+
return err;
}
@@ -15941,7 +15962,8 @@ 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,