Re: [PATCH 1/5] wifi: rtw89: 8852c: add beacon filter and CQM support

[Kalle Valo <kvalo@kernel.org>]

Ping-Ke Shih <pkshih@realtek.com> writes:

> From: Po-Hao Huang <phhuang@realtek.com>
>
> Adding this supports beacon filter and connection quality monitor.
> To make host CPU wake up less, let firmware perform signal
> monitoring and beacon processing, then notify driver upon signal
> changes or beacon loss.
>
> This feature needs firmware 0.27.56 or newer to support it.
>
> Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>

[...]

> --- a/drivers/net/wireless/realtek/rtw89/core.c
> +++ b/drivers/net/wireless/realtek/rtw89/core.c
> @@ -1438,6 +1438,8 @@ static void rtw89_vif_rx_stats_iter(void *data, u8 *mac,
>  	struct rtw89_rx_desc_info *desc_info = iter_data->desc_info;
>  	struct sk_buff *skb = iter_data->skb;
>  	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
> +	struct rtw89_rx_phy_ppdu *phy_ppdu =
> +		(struct rtw89_rx_phy_ppdu *)iter_data->phy_ppdu;

Why the cast? I don't think it's needed.

> @@ -3181,6 +3204,15 @@ static inline struct rtw89_fw_c2h_attr *RTW89_SKB_C2H_CB(struct sk_buff *skb)
>  #define RTW89_GET_MAC_C2H_REV_ACK_H2C_SEQ(c2h) \
>  	le32_get_bits(*((const __le32 *)(c2h) + 2), GENMASK(23, 16))
>  
> +#define RTW89_GET_MAC_BCNFLTR_RPT_MACID(c2h) \
> +	le32_get_bits(*((const __le32 *)(c2h) + 2), GENMASK(7, 0))
> +#define RTW89_GET_MAC_BCNFLTR_RPT_TYPE(c2h) \
> +	le32_get_bits(*((const __le32 *)(c2h) + 2), GENMASK(9, 8))
> +#define RTW89_GET_MAC_BCNFLTR_RPT_EVENT(c2h) \
> +	le32_get_bits(*((const __le32 *)(c2h) + 2), GENMASK(11, 10))
> +#define RTW89_GET_MAC_BCNFLTR_RPT_MA(c2h) \
> +	le32_get_bits(*((const __le32 *)(c2h) + 2), GENMASK(23, 16))

I have to admit that I every time I see this code pattern it makes me
regret it. Something like what Arnd proposed back in the day would look
so much cleaner:

https://lore.kernel.org/all/CAK8P3a1rsKZZKMKFTDWgE3usX9gYKJqUvTMxSdEuZrp8BaKdaA@mail.gmail.com/

Of course this is just a generic comment about rtw89, and has nothing to
do with this patchset, but it would be great if someone could take a
look and try out Arnd's proposal. It would be good to start with just
one or two commands and send that as an RFC to see how it looks like.

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