From 0fc29376ea42d875f9399ce7a6c0fb4e1fd72c3e Mon Sep 17 00:00:00 2001 From: Roopni Devanathan Date: Fri, 24 Oct 2025 10:16:48 +0530 Subject: [PATCH] wifi: cfg80211: Add debugfs support for multi-radio wiphy In multi-radio wiphy architecture, where a single wiphy can have multiple radios tied to it, radio specific configuration parameters and global wiphy parameters are maintained for the entire physical device and common to all radios. But, each radio in a wiphy can have different values for each radio configuration parameter, like RTS threshold. With the current debugfs directory structure, the values of global wiphy configuration parameters can be viewed, but, values of individual radio configuration parameters cannot be viewed, as radio specific configuration parameters are not maintained, separately. To address this, in addition to maintaining global wiphy configuration parameters common to all radios, create separate debugfs directories for each radio in a wiphy to maintain parameters corresponding to that radio in this directory. In implementation, maintain a dentry structure in wiphy_radio_cfg, a structure containing radio configurations of a wiphy. This struct is maintained to denote per-radio configurations of a wiphy. Create separate directories representing each radio within phy#X directory in debugfs during wiphy registration. Sample directory structure with this change: ls /sys/kernel/debug/ieee80211/phy0/radio radio0/ radio1/ radio2/ Signed-off-by: Roopni Devanathan Link: https://patch.msgid.link/20251024044649.483557-2-quic_rdevanat@quicinc.com Signed-off-by: Johannes Berg --- include/net/cfg80211.h | 4 ++++ net/wireless/core.c | 15 +++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 820e299f06b5e..b5bf70eca39e6 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -5683,9 +5683,13 @@ struct wiphy_iftype_akm_suites { * * @rts_threshold: RTS threshold (dot11RTSThreshold); * -1 (default) = RTS/CTS disabled + * @radio_debugfsdir: Pointer to debugfs directory containing the radio- + * specific parameters. + * NULL (default) = Debugfs directory not created */ struct wiphy_radio_cfg { u32 rts_threshold; + struct dentry *radio_debugfsdir; }; /** diff --git a/net/wireless/core.c b/net/wireless/core.c index 54a34d8d356e0..9f858a83e912f 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -34,6 +34,9 @@ /* name for sysfs, %d is appended */ #define PHY_NAME "phy" +/* maximum length of radio debugfs directory name */ +#define RADIO_DEBUGFSDIR_MAX_LEN 8 + MODULE_AUTHOR("Johannes Berg"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("wireless configuration support"); @@ -1042,6 +1045,18 @@ int wiphy_register(struct wiphy *wiphy) /* add to debugfs */ rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy), ieee80211_debugfs_dir); + if (wiphy->n_radio > 0) { + int idx; + char radio_name[RADIO_DEBUGFSDIR_MAX_LEN]; + + for (idx = 0; idx < wiphy->n_radio; idx++) { + scnprintf(radio_name, sizeof(radio_name), "radio%d", + idx); + wiphy->radio_cfg[idx].radio_debugfsdir = + debugfs_create_dir(radio_name, + rdev->wiphy.debugfsdir); + } + } cfg80211_debugfs_rdev_add(rdev); nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);