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

[Bryan O'Donoghue]

On 13/12/2021 13:51, Bryan O'Donoghue 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/hal.h b/drivers/net/wireless/ath/wcn36xx/hal.h
> index e9fec110721b5..3351aaf5140df 100644
> --- a/drivers/net/wireless/ath/wcn36xx/hal.h
> +++ b/drivers/net/wireless/ath/wcn36xx/hal.h
> @@ -3468,6 +3468,22 @@ struct beacon_filter_ie {
>   	u8 ref;
>   } __packed;
>   
> +/* Downstream values for the bitmask field */
> +#define WCN36XX_FILTER_CAPABILITY_MASK		0x73cf
> +#define WCN36XX_FILTER_IE_DS_CHANNEL_MASK	0x00
> +#define WCN36XX_FILTER_IE_ERP_FILTER_MASK	0xF8
> +#define WCN36XX_FILTER_IE_EDCA_FILTER_MASK	0xF0
> +#define WCN36XX_FILTER_IE_QOS_FILTER_MASK	0xF0
> +#define WCN36XX_FILTER_IE_CHANNEL_SWITCH_MASK	0x00
> +#define WCN36XX_FILTER_IE_HT_BYTE0_FILTER_MASK	0x00
> +#define WCN36XX_FILTER_IE_HT_BYTE1_FILTER_MASK	0xF8
> +#define WCN36XX_FILTER_IE_HT_BYTE2_FILTER_MASK	0xEB
> +#define WCN36XX_FILTER_IE_HT_BYTE5_FILTER_MASK	0xFD
> +#define WCN36XX_FILTER_IE_OPMODE_NOTIF_MASK	0x00
> +#define WCN36XX_FILTER_IE_VHTOP_CHWIDTH_MASK	0xFC
> +#define WCN36XX_FILTER_IE_RSN_MASK		0x00
> +#define WCN36XX_FILTER_IE_VENDOR_MASK		0x00
> +

> diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
> index b05d10f9f6005..e6ee14adbe0da 100644
> --- a/drivers/net/wireless/ath/wcn36xx/smd.c
> +++ b/drivers/net/wireless/ath/wcn36xx/smd.c

> +/* Downstream values for the bitmask field */
> +#define WCN36XX_FILTER_CAPABILITY_MASK		0x73cf
> +#define WCN36XX_FILTER_IE_DS_CHANNEL_MASK	0x00
> +#define WCN36XX_FILTER_IE_ERP_FILTER_MASK	0xF8
> +#define WCN36XX_FILTER_IE_EDCA_FILTER_MASK	0xF0
> +#define WCN36XX_FILTER_IE_QOS_FILTER_MASK	0xF0
> +#define WCN36XX_FILTER_IE_CHANNEL_SWITCH_MASK	0x00
> +#define WCN36XX_FILTER_IE_HT_BYTE0_FILTER_MASK	0x00
> +#define WCN36XX_FILTER_IE_HT_BYTE1_FILTER_MASK	0xF8
> +#define WCN36XX_FILTER_IE_HT_BYTE2_FILTER_MASK	0xEB
> +#define WCN36XX_FILTER_IE_HT_BYTE5_FILTER_MASK	0xFD
> +#define WCN36XX_FILTER_IE_PWR_CONSTRAINT_MASK	0x00
> +#define WCN36XX_FILTER_IE_OPMODE_NOTIF_MASK	0x00
> +#define WCN36XX_FILTER_IE_VHTOP_CHWIDTH_MASK	0xFC
> +#define WCN36XX_FILTER_IE_RSN_MASK		0x00
> +#define WCN36XX_FILTER_IE_VENDOR_MASK		0x00

Well, I didn't mean to do that..