Re: [PATCH v2] wifi: mwl8k: inject DSSS Parameter Set element into beacons if missing

[Johannes Berg <johannes@sipsolutions.net>]

> 
> ---
> V2:
>   - added "wifi:" prefix to commit title
>   - renamed "DS Params" -> "DSSS Parameter Set"
>   - Insert WLAN_EID_DS_PARAMS after WLAN_EID_SSID, WLAN_EID_SUPP_RATES
>     and WLAN_EID_EXT_SUPP_RATES

FWIW, per spec it should be between them:

- SSID
- Supported Rates
- DSSS Parameter Set
- TIM
- Country
- ...
- Extended Supported Rates

so actually Extended Supported Rates is also in the _tail_ part of the
cfg80211 API.


> ---
>  drivers/net/wireless/marvell/mwl8k.c | 71 ++++++++++++++++++++++++++--
>  1 file changed, 66 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/wireless/marvell/mwl8k.c b/drivers/net/wireless/marvell/mwl8k.c
> index 891e125ad30b..914a566d700a 100644
> --- a/drivers/net/wireless/marvell/mwl8k.c
> +++ b/drivers/net/wireless/marvell/mwl8k.c
> @@ -2966,6 +2966,52 @@ mwl8k_cmd_rf_antenna(struct ieee80211_hw *hw, int antenna, int mask)
>  /*
>   * CMD_SET_BEACON.
>   */
> +
> +static bool mwl8k_beacon_has_ds_params(const u8 *buf, int len)
> +{
> +	const struct ieee80211_mgmt *mgmt = (const void *)buf;
> +	int ies_len;
> +
> +	if (len <= offsetof(struct ieee80211_mgmt, u.beacon.variable))
> +		return false;
> +
> +	ies_len = len - offsetof(struct ieee80211_mgmt, u.beacon.variable);
> +
> +	return cfg80211_find_ie(WLAN_EID_DS_PARAMS, mgmt->u.beacon.variable,
> +				ies_len) != NULL;
> +}
> +
> +static void mwl8k_beacon_copy_inject_ds_params(struct ieee80211_hw *hw,
> +					       u8 *buf_dst, const u8 *buf_src,
> +					       int src_len)
> +{
> +	const struct ieee80211_mgmt *mgmt = (const void *)buf_src;
> +	static const u8 before_ds_params[] = {
> +			WLAN_EID_SSID,
> +			WLAN_EID_SUPP_RATES,
> +			WLAN_EID_EXT_SUPP_RATES,
> +	};

nit: seems on tab would be nicer?

> -	cmd = kzalloc(sizeof(*cmd) + len, GFP_KERNEL);
> +	if (!ds_params_present)
> +		/*
> +		 * mwl8k firmware requires a DS Params IE with the current
> +		 * channel in AP beacons. If mac80211/hostapd does not
> +		 * include it, inject one here. IE ID + length + channel
> +		 * number = 3 bytes.
> +		 */
> +		final_len += 3;
> +

another nit: I'd probably add braces

johannes