cfg80211: DFS get CAC time from regulatory database
Send Channel Availability Check time as a parameter
of start_radar_detection() callback.
Get CAC time from regulatory database.
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 5946450..8659d5c 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -490,6 +490,62 @@
return r;
}
+static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bandwidth)
+{
+ struct ieee80211_channel *c;
+ u32 start_freq, end_freq, freq;
+ unsigned int dfs_cac_ms = 0;
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
+
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c)
+ return 0;
+
+ if (c->flags & IEEE80211_CHAN_DISABLED)
+ return 0;
+
+ if (!(c->flags & IEEE80211_CHAN_RADAR))
+ continue;
+
+ if (c->dfs_cac_ms > dfs_cac_ms)
+ dfs_cac_ms = c->dfs_cac_ms;
+ }
+
+ return dfs_cac_ms;
+}
+
+unsigned int
+cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef)
+{
+ int width;
+ unsigned int t1 = 0, t2 = 0;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return 0;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return 0;
+
+ t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
+ chandef->center_freq1,
+ width);
+
+ if (!chandef->center_freq2)
+ return t1;
+
+ t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
+ chandef->center_freq2,
+ width);
+
+ return max(t1, t2);
+}
static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
u32 center_freq, u32 bandwidth,
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 4068300..64fde38 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -402,6 +402,9 @@
void cfg80211_dfs_channels_update_work(struct work_struct *work);
+unsigned int
+cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef);
static inline int
cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index d47c9d1..c52ff59 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -778,7 +778,7 @@
switch (event) {
case NL80211_RADAR_CAC_FINISHED:
timeout = wdev->cac_start_time +
- msecs_to_jiffies(IEEE80211_DFS_MIN_CAC_TIME_MS);
+ msecs_to_jiffies(wdev->cac_time_ms);
WARN_ON(!time_after_eq(jiffies, timeout));
cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
break;
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 9f7ebf9..8fa02a3 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5779,6 +5779,7 @@
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_chan_def chandef;
enum nl80211_dfs_regions dfs_region;
+ unsigned int cac_time_ms;
int err;
dfs_region = reg_get_dfs_region(wdev->wiphy);
@@ -5814,11 +5815,17 @@
if (err)
return err;
- err = rdev->ops->start_radar_detection(&rdev->wiphy, dev, &chandef);
+ cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, &chandef);
+ if (WARN_ON(!cac_time_ms))
+ cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
+
+ err = rdev->ops->start_radar_detection(&rdev->wiphy, dev, &chandef,
+ cac_time_ms);
if (!err) {
wdev->chandef = chandef;
wdev->cac_started = true;
wdev->cac_start_time = jiffies;
+ wdev->cac_time_ms = cac_time_ms;
}
return err;
}