[PATCH 2/3] wifi: ath11k: fix CAC running state during virtual interface start

[Jeff Johnson]

On 6/7/2023 5:46 AM, Aditya Kumar Singh wrote:
> Currently channel definition's primary channel's DFS CAC time
> as well as primary channel's state i.e usable are used to set
> the CAC_RUNNING flag for the ath11k radio structure. However,
> this is wrong since certain channel definition are possbile
> where primary channel may not be a DFS channel but, secondary
> channel is a DFS channel. For example - channel 36 with 160 MHz
> bandwidth.
> In such cases, the flag will not be set which is wrong.
> 
> Fix this issue by using cfg80211_chandef_dfs_usable() function
> from cfg80211 which return trues if at least one channel is in
> usable state.
> 
> While at it, modify the CAC running debug log message to print
> the CAC time as well in milli-seconds.
> 
> Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
> 
> Signed-off-by: Aditya Kumar Singh <quic_adisi at quicinc.com>

Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>

> ---
>   drivers/net/wireless/ath/ath11k/mac.c | 19 +++++++++++--------
>   1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
> index a31b8e89684b..31982545266b 100644
> --- a/drivers/net/wireless/ath/ath11k/mac.c
> +++ b/drivers/net/wireless/ath/ath11k/mac.c
> @@ -5,6 +5,7 @@
>    */
>   
>   #include <net/mac80211.h>
> +#include <net/cfg80211.h>
>   #include <linux/etherdevice.h>
>   #include <linux/bitfield.h>
>   #include <linux/inetdevice.h>
> @@ -7193,6 +7194,7 @@ ath11k_mac_vdev_start_restart(struct ath11k_vif *arvif,
>   	struct wmi_vdev_start_req_arg arg = {};
>   	const struct cfg80211_chan_def *chandef = &ctx->def;
>   	int ret = 0;
> +	unsigned int dfs_cac_time;
>   
>   	lockdep_assert_held(&ar->conf_mutex);
>   
> @@ -7272,20 +7274,21 @@ ath11k_mac_vdev_start_restart(struct ath11k_vif *arvif,
>   	ath11k_dbg(ab, ATH11K_DBG_MAC,  "vdev %pM started, vdev_id %d\n",
>   		   arvif->vif->addr, arvif->vdev_id);
>   
> -	/* Enable CAC Flag in the driver by checking the channel DFS cac time,
> -	 * i.e dfs_cac_ms value which will be valid only for radar channels
> -	 * and state as NL80211_DFS_USABLE which indicates CAC needs to be
> +	/* Enable CAC Flag in the driver by checking the all sub-channel's DFS
> +	 * state as NL80211_DFS_USABLE which indicates CAC needs to be
>   	 * done before channel usage. This flags is used to drop rx packets.
>   	 * during CAC.
>   	 */
>   	/* TODO Set the flag for other interface types as required */
> -	if (arvif->vdev_type == WMI_VDEV_TYPE_AP &&
> -	    chandef->chan->dfs_cac_ms &&
> -	    chandef->chan->dfs_state == NL80211_DFS_USABLE) {
> +	if (arvif->vdev_type == WMI_VDEV_TYPE_AP && ctx->radar_enabled &&
> +	    cfg80211_chandef_dfs_usable(ar->hw->wiphy, chandef)) {
>   		set_bit(ATH11K_CAC_RUNNING, &ar->dev_flags);
> +		dfs_cac_time = cfg80211_chandef_dfs_cac_time(ar->hw->wiphy,
> +							     chandef);
>   		ath11k_dbg(ab, ATH11K_DBG_MAC,
> -			   "CAC Started in chan_freq %d for vdev %d\n",
> -			   arg.channel.freq, arg.vdev_id);
> +			   "CAC (for %u ms) Started in center_freq %d center_freq1 %d for vdev %d\n",
> +			   dfs_cac_time, arg.channel.freq, chandef->center_freq1,
> +			   arg.vdev_id);
>   	}
>   
>   	ret = ath11k_mac_set_txbf_conf(arvif);