linux-kernel - [PATCH] wifi: nxpwifi: add debugfs file to mimic radar detection

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Message-Id: <20241009060935.9074-1-yu-hao.lin@nxp.com>
Date: Wed,  9 Oct 2024 14:09:35 +0800
From: David Lin <yu-hao.lin@....com>
To: linux-wireless@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	briannorris@...omium.org,
	kvalo@...nel.org,
	francesco@...cini.it,
	tsung-hsien.hsieh@....com,
	s.hauer@...gutronix.de,
	David Lin <yu-hao.lin@....com>
Subject: [PATCH] wifi: nxpwifi: add debugfs file to mimic radar detection

Debugfs file "fake_radar_detect" is created to mimic radar
detection. Echo 1 to this file will generate radar event
to cfg80211, which can be used to test AP DFS mode without
real radar detection from firmware.

Signed-off-by: David Lin <yu-hao.lin@....com>
---
 .../net/wireless/marvell/mwifiex/debugfs.c    | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/debugfs.c b/drivers/net/wireless/marvell/mwifiex/debugfs.c
index 9deaf59dcb62..cf9604661aed 100644
--- a/drivers/net/wireless/marvell/mwifiex/debugfs.c
+++ b/drivers/net/wireless/marvell/mwifiex/debugfs.c
@@ -909,6 +909,47 @@ mwifiex_reset_write(struct file *file,
 	return count;
 }
 
+static ssize_t
+mwifiex_fake_radar_detect_write(struct file *file,
+				const char __user *ubuf,
+				size_t count, loff_t *ppos)
+{
+	struct mwifiex_private *priv = file->private_data;
+	struct mwifiex_adapter *adapter = priv->adapter;
+	bool result;
+	int rc;
+
+	rc = kstrtobool_from_user(ubuf, count, &result);
+	if (rc)
+		return rc;
+
+	if (!result)
+		return -EINVAL;
+
+	if (priv->wdev.links[0].cac_started) {
+		mwifiex_dbg(adapter, MSG,
+			    "Generate fake radar detected during CAC\n");
+		if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef))
+			mwifiex_dbg(adapter, ERROR,
+				    "Failed to stop CAC in FW\n");
+		cancel_delayed_work_sync(&priv->dfs_cac_work);
+		cfg80211_cac_event(priv->netdev, &priv->dfs_chandef,
+				   NL80211_RADAR_CAC_ABORTED, GFP_KERNEL, 0);
+		cfg80211_radar_event(adapter->wiphy, &priv->dfs_chandef,
+				     GFP_KERNEL);
+	} else {
+		if (priv->bss_chandef.chan->dfs_cac_ms) {
+			mwifiex_dbg(adapter, MSG,
+				    "Generate fake radar detected\n");
+			cfg80211_radar_event(adapter->wiphy,
+					     &priv->dfs_chandef,
+					     GFP_KERNEL);
+		}
+	}
+
+	return count;
+}
+
 #define MWIFIEX_DFS_ADD_FILE(name) do {                                 \
 	debugfs_create_file(#name, 0644, priv->dfs_dev_dir, priv,       \
 			    &mwifiex_dfs_##name##_fops);                \
@@ -945,6 +986,7 @@ MWIFIEX_DFS_FILE_OPS(histogram);
 MWIFIEX_DFS_FILE_OPS(debug_mask);
 MWIFIEX_DFS_FILE_OPS(timeshare_coex);
 MWIFIEX_DFS_FILE_WRITE_OPS(reset);
+MWIFIEX_DFS_FILE_WRITE_OPS(fake_radar_detect);
 MWIFIEX_DFS_FILE_OPS(verext);
 
 /*
@@ -971,6 +1013,7 @@ mwifiex_dev_debugfs_init(struct mwifiex_private *priv)
 	MWIFIEX_DFS_ADD_FILE(debug_mask);
 	MWIFIEX_DFS_ADD_FILE(timeshare_coex);
 	MWIFIEX_DFS_ADD_FILE(reset);
+	MWIFIEX_DFS_ADD_FILE(fake_radar_detect);
 	MWIFIEX_DFS_ADD_FILE(verext);
 }
 

base-commit: 5a4d42c1688c88f3be6aef46b0ea6c32694cd2b8
prerequisite-patch-id: ababe4f5cc6f52d23552f4ada6efb26655f247e3
-- 
2.34.1