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From:   Lorenzo Bianconi <lorenzo@kernel.org>
To:     nbd@nbd.name, johannes@sipsolutions.net
Cc:     linux-wireless@vger.kernel.org, lorenzo.bianconi@redhat.com,
        ryder.lee@mediatek.com, evelyn.tsai@mediatek.com, john@phrozen.org
Subject: [RFC 3/7] cfg80211: introduce cfg80211_cac_offchan_event routine
Date:   Tue, 28 Sep 2021 17:14:34 +0200
Message-Id: <dac35d82115f4440ef2dbfd90da291675b4052ea.1632841652.git.lorenzo@kernel.org>
In-Reply-To: <cover.1632841652.git.lorenzo@kernel.org>
References: <cover.1632841652.git.lorenzo@kernel.org>
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Introduce cfg80211_cac_offchan_event routine in order to notify
userland when a Channel Availability Check (CAC) is finished or aborted
by offchannel dedicated chain.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 include/net/cfg80211.h | 13 +++++++++++++
 net/wireless/mlme.c    | 26 ++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index fa31b0919be9..7c1bcd406a34 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -7564,6 +7564,19 @@ void cfg80211_cac_event(struct net_device *netdev,
 			const struct cfg80211_chan_def *chandef,
 			enum nl80211_radar_event event, gfp_t gfp);
 
+/**
+ * cfg80211_cac_offchan_event - Channel Availability Check (CAC) offchan event
+ * @wiphy: the wiphy
+ * @chandef: chandef for the current channel
+ * @event: type of event
+ * @gfp: context flags
+ *
+ * This function is called when a Channel Availability Check (CAC) is finished
+ * or aborted by offchannel dedicated chain.
+ */
+void cfg80211_cac_offchan_event(struct wiphy *wiphy,
+				const struct cfg80211_chan_def *chandef,
+				enum nl80211_radar_event event, gfp_t gfp);
 
 /**
  * cfg80211_gtk_rekey_notify - notify userspace about driver rekeying
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 3aa69b375a10..4362f4f49bb4 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -968,3 +968,29 @@ void cfg80211_cac_event(struct net_device *netdev,
 	nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 }
 EXPORT_SYMBOL(cfg80211_cac_event);
+
+void cfg80211_cac_offchan_event(struct wiphy *wiphy,
+				const struct cfg80211_chan_def *chandef,
+				enum nl80211_radar_event event, gfp_t gfp)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+	switch (event) {
+	case NL80211_RADAR_CAC_FINISHED:
+		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
+		memcpy(&rdev->cac_done_chandef, chandef,
+		       sizeof(struct cfg80211_chan_def));
+		queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
+		cfg80211_sched_dfs_chan_update(rdev);
+		break;
+	case NL80211_RADAR_CAC_ABORTED:
+	case NL80211_RADAR_CAC_STARTED:
+		break;
+	default:
+		WARN_ON(1);
+		return;
+	}
+
+	nl80211_radar_notify(rdev, chandef, event, NULL, gfp);
+}
+EXPORT_SYMBOL(cfg80211_cac_offchan_event);
-- 
2.31.1