netdev - Re: [PATCH RESEND net-next v7] wwan: core: Support slicing in port TX flow of WWAN subsystem

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Date:   Mon, 13 Mar 2023 16:08:37 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     <haozhe.chang@...iatek.com>
Cc:     M Chetan Kumar <m.chetan.kumar@...el.com>,
        Intel Corporation <linuxwwan@...el.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Chandrashekar Devegowda <chandrashekar.devegowda@...el.com>,
        Chiranjeevi Rapolu <chiranjeevi.rapolu@...ux.intel.com>,
        Liu Haijun <haijun.liu@...iatek.com>,
        Ricardo Martinez <ricardo.martinez@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Oliver Neukum <oneukum@...e.com>,
        Shang XiaoJing <shangxiaojing@...wei.com>,
        "open list:INTEL WWAN IOSM DRIVER" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:REMOTE PROCESSOR MESSAGING (RPMSG) WWAN CONTROL..." 
        <linux-remoteproc@...r.kernel.org>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, <lambert.wang@...iatek.com>,
        <xiayu.zhang@...iatek.com>, <hua.yang@...iatek.com>
Subject: Re: [PATCH RESEND net-next v7] wwan: core: Support slicing in port
 TX flow of WWAN subsystem

On Wed, 8 Mar 2023 16:19:35 +0800 haozhe.chang@...iatek.com wrote:
>  /**
>   * wwan_create_port - Add a new WWAN port
>   * @parent: Device to use as parent and shared by all WWAN ports
>   * @type: WWAN port type
>   * @ops: WWAN port operations
> + * @frag_len: WWAN port TX fragments length, if WWAN_NO_FRAGMENT is set,
> + *            the WWAN core don't fragment control packages.
> + * @headroom_len: WWAN port TX fragments reserved headroom length, if WWAN_NO_HEADROOM
> + *                is set, the WWAN core don't reserve headroom in control packages.
>   * @drvdata: Pointer to caller driver data
>   *
>   * Allocate and register a new WWAN port. The port will be automatically exposed
> @@ -86,6 +100,8 @@ struct wwan_port_ops {
>  struct wwan_port *wwan_create_port(struct device *parent,
>  				   enum wwan_port_type type,
>  				   const struct wwan_port_ops *ops,
> +				   size_t frag_len,
> +				   unsigned int headroom_len,
>  				   void *drvdata);
>  

Too many arguments, and poor extensibility.
Please wrap the new params into a capability struct:

struct wwan_port_caps {
	unsigned int frag_len;
	unsigned int headroom_len;
};

pass a pointer to this kind of structure in.

Next time someone needs to add a quirk they can just add a field and
won't need to change all the drivers.