[PATCH v2 mac80211-next 1/6] cfg80211: introduce set_radar_offchan callback

[Lorenzo Bianconi <lorenzo@kernel.org>]

Introduce set_radar_offchan callback in cfg80211_ops in order to
configure a dedicated offchannel chain available for radar/CAC
detection on some hw. This chain can't be used to transmit
or receive frames and it is bounded to a running wdev.
Offchannel radar/CAC detection allows to avoid the CAC downtime
switching on a different channel during CAC detection on the selected
radar channel.

Tested-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 include/net/cfg80211.h  | 11 +++++++++++
 net/wireless/rdev-ops.h | 18 ++++++++++++++++++
 net/wireless/trace.h    | 19 +++++++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 7c9d5db4f0e6..3bb76835f4b1 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -4072,6 +4072,15 @@ struct mgmt_frame_regs {
  * @set_fils_aad: Set FILS AAD data to the AP driver so that the driver can use
  *	those to decrypt (Re)Association Request and encrypt (Re)Association
  *	Response frame.
+ *
+ * @set_radar_offchan: Configure dedicated offchannel chain available for
+ *	radar/CAC detection on some hw. This chain can't be used to transmit
+ *	or receive frames and it is bounded to a running wdev.
+ *	Offchannel radar/CAC detection allows to avoid the CAC downtime
+ *	switching to a different channel during CAC detection on the selected
+ *	radar channel.
+ *	The caller is expected to set chandef pointer to NULL in order to
+ *	disable offchannel CAC/radar detection.
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -4404,6 +4413,8 @@ struct cfg80211_ops {
 				struct cfg80211_color_change_settings *params);
 	int     (*set_fils_aad)(struct wiphy *wiphy, struct net_device *dev,
 				struct cfg80211_fils_aad *fils_aad);
+	int	(*set_radar_offchan)(struct wiphy *wiphy,
+				     struct cfg80211_chan_def *chandef);
 };
 
 /*
diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index cc1efec4b27b..980f1403e000 100644
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -1395,4 +1395,22 @@ rdev_set_fils_aad(struct cfg80211_registered_device *rdev,
 	return ret;
 }
 
+static inline int
+rdev_set_radar_offchan(struct cfg80211_registered_device *rdev,
+		       struct cfg80211_chan_def *chandef)
+{
+	struct wiphy *wiphy = &rdev->wiphy;
+	int ret;
+
+	if (!rdev->ops->set_radar_offchan)
+		return -EOPNOTSUPP;
+
+	if (chandef)
+		trace_rdev_set_radar_offchan(wiphy, chandef);
+	ret = rdev->ops->set_radar_offchan(wiphy, chandef);
+	trace_rdev_return_int(wiphy, ret);
+
+	return ret;
+}
+
 #endif /* __CFG80211_RDEV_OPS */
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index ad6c16a06bcb..0b27eaa14a18 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -3674,6 +3674,25 @@ TRACE_EVENT(cfg80211_bss_color_notify,
 		  __entry->color_bitmap)
 );
 
+TRACE_EVENT(rdev_set_radar_offchan,
+	TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef),
+
+	TP_ARGS(wiphy, chandef),
+
+	TP_STRUCT__entry(
+		WIPHY_ENTRY
+		CHAN_DEF_ENTRY
+	),
+
+	TP_fast_assign(
+		WIPHY_ASSIGN;
+		CHAN_DEF_ASSIGN(chandef)
+	),
+
+	TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT,
+		  WIPHY_PR_ARG, CHAN_DEF_PR_ARG)
+);
+
 #endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
 
 #undef TRACE_INCLUDE_PATH
-- 
2.31.1