On 10/14/2018 10:07 PM, Tamizh chelvam wrote:
> Many number of false radar detection occurred in a noisy
> environment in QCA4019, QCA9888 devices. By reducing
> PRI_TOLERANCE to 6 and flushing out pulse queue by dpd_reset
> if timestamp between current and previous pulse is lesser than
> 100ms helps to avoid/reduce this false radar detection
> in the noisy environment.
>
> Tested ath10k hw and fw:
> * QCA9888(10.4-3.5.1-00052)
> * QCA4019(10.4-3.2.1.1-00017)
> * QCA9984(10.4-3.6-00104)
> * QCA988X(10.2.4-1.0-00041)
>
> Tested ath9k hw: AR9300
Please post the radar detection rate results before and after this change.
Especially for ETSI at 30% channel load.
> Signed-off-by: Tamizh chelvam <tamizhr@xxxxxxxxxxxxxx>
> ---
> drivers/net/wireless/ath/ath.h | 2 ++
> drivers/net/wireless/ath/ath10k/mac.c | 4 ++++
> drivers/net/wireless/ath/ath9k/init.c | 1 +
> drivers/net/wireless/ath/dfs_pattern_detector.c | 4 +++-
> drivers/net/wireless/ath/dfs_pattern_detector.h | 2 +-
> 5 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
> index 7a364ec..2bf2d0c 100644
> --- a/drivers/net/wireless/ath/ath.h
> +++ b/drivers/net/wireless/ath/ath.h
> @@ -184,6 +184,8 @@ struct ath_common {
>
> int last_rssi;
> struct ieee80211_supported_band sbands[NUM_NL80211_BANDS];
> +
> + int dfs_pulse_valid_diff_ts;
> };
>
> static inline const struct ath_ps_ops *ath_ps_ops(struct ath_common *common)
> diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
> index a1c2801..c93b81c 100644
> --- a/drivers/net/wireless/ath/ath10k/mac.c
> +++ b/drivers/net/wireless/ath/ath10k/mac.c
> @@ -8275,6 +8275,8 @@ struct ath10k_vif *ath10k_get_arvif(struct ath10k *ar, u32 vdev_id)
> #define WRD_METHOD "WRDD"
> #define WRDD_WIFI (0x07)
>
> +#define ATH10K_DFS_PULSE_VALID_DIFF_TS 100
> +
> static u32 ath10k_mac_wrdd_get_mcc(struct ath10k *ar, union acpi_object *wrdd)
> {
> union acpi_object *mcc_pkg;
> @@ -8642,6 +8644,8 @@ int ath10k_mac_register(struct ath10k *ar)
> if (IS_ENABLED(CONFIG_ATH10K_DFS_CERTIFIED)) {
> /* Init ath dfs pattern detector */
> ar->ath_common.debug_mask = ATH_DBG_DFS;
> + ar->ath_common.dfs_pulse_valid_diff_ts =
> + ATH10K_DFS_PULSE_VALID_DIFF_TS;
> ar->dfs_detector = dfs_pattern_detector_init(&ar->ath_common,
> NL80211_DFS_UNSET);
>
> diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
> index c070a9e..7ea4460 100644
> --- a/drivers/net/wireless/ath/ath9k/init.c
> +++ b/drivers/net/wireless/ath/ath9k/init.c
> @@ -696,6 +696,7 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
> common->debug_mask = ath9k_debug;
> common->btcoex_enabled = ath9k_btcoex_enable == 1;
> common->disable_ani = false;
> + common->dfs_pulse_valid_diff_ts = 0;
Why it's 0 here while ath10k is using 100us?
>
> /*
> * Platform quirks.
> diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.c b/drivers/net/wireless/ath/dfs_pattern_detector.c
> index d52b31b..3dbf0ab 100644
> --- a/drivers/net/wireless/ath/dfs_pattern_detector.c
> +++ b/drivers/net/wireless/ath/dfs_pattern_detector.c
> @@ -273,6 +273,7 @@ static void dpd_exit(struct dfs_pattern_detector *dpd)
> {
> u32 i;
> struct channel_detector *cd;
> + int diff_ts;
>
> /*
> * pulses received for a non-supported or un-initialized
> @@ -285,8 +286,9 @@ static void dpd_exit(struct dfs_pattern_detector *dpd)
> if (cd == NULL)
> return false;
>
> + diff_ts = event->ts - dpd->last_pulse_ts;
> /* reset detector on time stamp wraparound, caused by TSF reset */
> - if (event->ts < dpd->last_pulse_ts)
> + if (diff_ts < dpd->common->dfs_pulse_valid_diff_ts)
This is only valid when 1 radar pattern detected at a time.
But there are many locations that overlapped with multiple radar equipment.
How this change handles if 2 different radars detected at the same time?
Check out the radar operation center deployed.
https://www.roc.noaa.gov/WSR88D/Maps.aspx
> dpd_reset(dpd);
> dpd->last_pulse_ts = event->ts;
>
> diff --git a/drivers/net/wireless/ath/dfs_pattern_detector.h b/drivers/net/wireless/ath/dfs_pattern_detector.h
> index 18db6f4..6f419d4 100644
> --- a/drivers/net/wireless/ath/dfs_pattern_detector.h
> +++ b/drivers/net/wireless/ath/dfs_pattern_detector.h
> @@ -24,7 +24,7 @@
> /* tolerated deviation of radar time stamp in usecs on both sides
> * TODO: this might need to be HW-dependent
> */
> -#define PRI_TOLERANCE 16
> +#define PRI_TOLERANCE 6
What is this number 6 come from?
Thanks,
Peter
