[PATCH v3 3/3] wcn36xx: Implement downstream compliant beacon filtering

[Loic Poulain]

On Tue, 14 Dec 2021 at 14:44, 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>

Reviewed-by: Loic Poulain <loic.poulain at linaro.org>