From: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Date: Tue, 27 May 2025 08:41:43 +0000 (+0530)
Subject: wifi: cfg80211: Add utility API to get radio index from channel
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df42bfc96e0ad90d243c0ee6b783a33bdb72a184;p=thirdparty%2Fkernel%2Fstable.git

wifi: cfg80211: Add utility API to get radio index from channel

Add utility API cfg80211_get_radio_idx_by_chan() to retrieve the radio
index corresponding to a given channel in a multi-radio wiphy.

This utility function can be used when we want to check the radio-specific
data for a channel in a multi-radio wiphy. For example, it can help
determine the radio index required to handle a scan request. This index
can then be used to decide whether the scan can proceed without
interfering with ongoing DFS operations on another radio.

Signed-off-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Co-developed-by: Raj Kumar Bhagat <quic_rajkbhag@quicinc.com>
Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@quicinc.com>
Link: https://patch.msgid.link/20250527-mlo-dfs-acs-v2-1-92c2f37c81d9@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index d1848dc8ec99..7719a90ab4d7 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -9372,6 +9372,17 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
 			       void (*iter)(const struct ieee80211_iface_combination *c,
 					    void *data),
 			       void *data);
+/**
+ * cfg80211_get_radio_idx_by_chan - get the radio index by the channel
+ *
+ * @wiphy: the wiphy
+ * @chan: channel for which the supported radio index is required
+ *
+ * Return: radio index on success or a negative error code
+ */
+int cfg80211_get_radio_idx_by_chan(struct wiphy *wiphy,
+				   const struct ieee80211_channel *chan);
+
 
 /**
  * cfg80211_stop_iface - trigger interface disconnection
diff --git a/net/wireless/util.c b/net/wireless/util.c
index ed868c0f7ca8..e438f883f085 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -2516,6 +2516,30 @@ int cfg80211_check_combinations(struct wiphy *wiphy,
 }
 EXPORT_SYMBOL(cfg80211_check_combinations);
 
+int cfg80211_get_radio_idx_by_chan(struct wiphy *wiphy,
+				   const struct ieee80211_channel *chan)
+{
+	const struct wiphy_radio *radio;
+	int i, j;
+	u32 freq;
+
+	if (!chan)
+		return -EINVAL;
+
+	freq = ieee80211_channel_to_khz(chan);
+	for (i = 0; i < wiphy->n_radio; i++) {
+		radio = &wiphy->radio[i];
+		for (j = 0; j < radio->n_freq_range; j++) {
+			if (freq >= radio->freq_range[j].start_freq &&
+			    freq < radio->freq_range[j].end_freq)
+				return i;
+		}
+	}
+
+	return -ENOENT;
+}
+EXPORT_SYMBOL(cfg80211_get_radio_idx_by_chan);
+
 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
 			   const u8 *rates, unsigned int n_rates,
 			   u32 *mask)