[PATCH 3/3] wcn36xx: Implement downstream compliant beacon filtering

[Loic Poulain]

On Mon, 13 Dec 2021 at 14:49, Bryan O'Donoghue
<bryan.odonoghue at linaro.org> wrote:
>
> Downstream facilitates the direct programming of beacon filter tables via
> SMD commands.
>
> The purpose of beacon filters is quote:
>
> /* When beacon filtering is enabled, firmware will
>  * analyze the selected beacons received during BMPS,
>  * and monitor any changes in the IEs as listed below.
>  * The format of the table is:
>  *    - EID
>  *    - Check for IE presence
>  *    - Byte offset
>  *    - Byte value
>  *    - Bit Mask
>  *    - Byte reference
>  */
>
> The default downstream firmware filter table looks something like this:
> tBeaconFilterIe gaBcnFilterTable[12] =
> {
>   { WLAN_EID_DS_PARAMS, 0u, { 0u, 0u, 0u, 0u } },
>   { WLAN_EID_ERP_INFO, 0u, { 0u, 0u, 248u, 0u } },
>   { WLAN_EID_EDCA_PARAM_SET, 0u, { 0u, 0u, 240u, 0u } },
>   { WLAN_EID_QOS_CAPA, 0u, { 0u, 0u, 240u, 0u } },
>   { WLAN_EID_CHANNEL_SWITCH, 1u, { 0u, 0u, 0u, 0u } },
>   { WLAN_EID_QUIET, 1u, { 0u, 0u, 0u, 0u } },
>   { WLAN_EID_HT_OPERATION, 0u, { 0u, 0u, 0u, 0u } },
>   { WLAN_EID_HT_OPERATION, 0u, { 1u, 0u, 248u, 0u } },
>   { WLAN_EID_HT_OPERATION, 0u, { 2u, 0u, 235u, 0u } },
>   { WLAN_EID_HT_OPERATION, 0u, { 5u, 0u, 253u, 0u } },
>   { WLAN_EID_PWR_CONSTRAINT, 0u, { 0u, 0u, 0u, 0u } },
>   { WLAN_EID_OPMODE_NOTIF, 0u, { 0u, 0u, 0u, 0u } }
> };
>
> Add in an equivalent filter set as present in the downstream Linux driver.
> For now omit the beacon filter "rem" command as downstream does not have an
> explicit call to that SMD command. The filter mask should only count when
> we are inside BMPS anyway.
>
> Replicating the downstream ability to program the filter table gives us
> scope to add and remove elements in future. For now though this patch
> makes the rote-copy of the downstream Linux beacon filter table, which we
> can tweak as desired from now on.
>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue at linaro.org>
> ---
>  drivers/net/wireless/ath/wcn36xx/hal.h  |  16 ++++
>  drivers/net/wireless/ath/wcn36xx/main.c |   1 +
>  drivers/net/wireless/ath/wcn36xx/smd.c  | 104 ++++++++++++++++++++++++
>  drivers/net/wireless/ath/wcn36xx/smd.h  |   3 +
>  4 files changed, 124 insertions(+)
>
[...]
> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
> index f59eb1119da88..a4510f144041f 100644
> --- a/drivers/net/wireless/ath/wcn36xx/main.c
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> @@ -934,6 +934,7 @@ static void wcn36xx_bss_info_changed(struct ieee80211_hw *hw,
>                          * place where AID is available.
>                          */
>                         wcn36xx_smd_config_sta(wcn, vif, sta);
> +                       wcn36xx_smd_add_beacon_filter(wcn, vif);

Shouldn't this be configured only if the vif type is NL80211_IFTYPE_STATION?

Regards,
Loic