netdev - Re: [PATCH v2 23/35] brcmfmac: cfg80211: Add support for scan params v2

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Date:   Tue, 11 Jan 2022 09:50:42 +0100
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Hector Martin <marcan@...can.st>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Dmitry Osipenko <digetx@...il.com>
Cc:     Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        "brian m. carlson" <sandals@...stytoothpaste.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [PATCH v2 23/35] brcmfmac: cfg80211: Add support for scan params
 v2

On 1/4/2022 8:26 AM, Hector Martin wrote:
> This new API version is required for at least the BCM4387 firmware. Add
> support for it, with a fallback to the v1 API.

Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>   .../broadcom/brcm80211/brcmfmac/cfg80211.c    | 113 ++++++++++++++----
>   .../broadcom/brcm80211/brcmfmac/feature.c     |   1 +
>   .../broadcom/brcm80211/brcmfmac/feature.h     |   4 +-
>   .../broadcom/brcm80211/brcmfmac/fwil_types.h  |  49 +++++++-
>   4 files changed, 145 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> index fb727778312c..71e932a8302c 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> @@ -769,12 +769,50 @@ void brcmf_set_mpc(struct brcmf_if *ifp, int mpc)
>   	}
>   }
>   
> +static void brcmf_escan_prep(struct brcmf_cfg80211_info *cfg,
> +			     struct brcmf_scan_params_v2_le *params_le,
> +			     struct cfg80211_scan_request *request);

I am not a fan of function prototypes so if it can be avoided by simply 
moving the function that would be preferred over this.

> +static void brcmf_scan_params_v2_to_v1(struct brcmf_scan_params_v2_le *params_v2_le,
> +				       struct brcmf_scan_params_le *params_le)
> +{

[...]

> +	if (!brcmf_feat_is_enabled(ifp, BRCMF_FEAT_SCAN_V2)) {

Okay. So it is not really a fallback. Phew!

> +		struct brcmf_escan_params_le *params_v1;
> +
> +		params_size -= BRCMF_SCAN_PARAMS_V2_FIXED_SIZE;
> +		params_size += BRCMF_SCAN_PARAMS_FIXED_SIZE;
> +		params_v1 = kzalloc(params_size, GFP_KERNEL);
> +		params_v1->version = cpu_to_le32(BRCMF_ESCAN_REQ_VERSION);
> +		brcmf_scan_params_v2_to_v1(&params->params_v2_le, &params_v1->params_le);
> +		kfree(params);
> +		params = params_v1;
> +	}
> +
>   	params->action = cpu_to_le16(WL_ESCAN_ACTION_START);
>   	params->sync_id = cpu_to_le16(0x1234);

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