Re: [RFC v5 wireless-next 2/4] wifi: cfg80211: set and report chandef CAC ongoing

[Johannes Berg <johannes@sipsolutions.net>]

On Sun, 2026-01-25 at 17:00 +0100, Janusz Dziedzic wrote:
> 
> + * @cac_ongoing_time: timestamp (CLOCK_BOOTTIME, nanoseconds) when CAC was
> + *	started on this channel. Zero when CAC is not in progress.

Is "ongoing" really a good name? To me something like "CAC start
timestamp" would seem more descriptive?

>   * @psd: power spectral density (in dBm)
>   */
>  struct ieee80211_channel {
> @@ -205,6 +207,7 @@ struct ieee80211_channel {
>  	enum nl80211_dfs_state dfs_state;
>  	unsigned long dfs_state_entered;
>  	unsigned int dfs_cac_ms;
> +	u64 cac_ongoing_time;
>  	s8 psd;
>  };
>  
> diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
> index b0f050e36fa4..7c23fd1b8ce9 100644
> --- a/include/uapi/linux/nl80211.h
> +++ b/include/uapi/linux/nl80211.h
> @@ -4452,6 +4452,10 @@ enum nl80211_wmm_rule {
>   * @NL80211_FREQUENCY_ATTR_S1G_NO_PRIMARY: Channel is not permitted for use
>   *	as a primary channel. Does not prevent the channel from existing
>   *	as a non-primary subchannel. Only applicable to S1G channels.
> + * @NL80211_FREQUENCY_ATTR_CAC_START_TIME: Channel Availability Check (CAC)
> + *	start time (CLOCK_BOOTTIME, nanoseconds). Only present when CAC is
> + *	currently in progress on this channel.

And here it _is_ "CAC start time".


johannes