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

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Date:   Thu, 16 Mar 2023 01:17:20 +0000
From:   Haozhe Chang (常浩哲) 
        <Haozhe.Chang@...iatek.com>
To:     "kuba@...nel.org" <kuba@...nel.org>
CC:     "stephan@...hold.net" <stephan@...hold.net>,
        "oneukum@...e.com" <oneukum@...e.com>,
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        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linuxwwan@...el.com" <linuxwwan@...el.com>,
        "m.chetan.kumar@...el.com" <m.chetan.kumar@...el.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Hua Yang (杨华) <Hua.Yang@...iatek.com>,
        "chiranjeevi.rapolu@...ux.intel.com" 
        <chiranjeevi.rapolu@...ux.intel.com>,
        Haijun Liu (刘海军) 
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        Xiayu Zhang (张夏宇) 
        <Xiayu.Zhang@...iatek.com>,
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        Lambert Wang (王伟) 
        <Lambert.Wang@...iatek.com>,
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        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH RESEND net-next v7] wwan: core: Support slicing in port TX
 flow of WWAN subsystem

Dear Jakub Kicinski

On Mon, 2023-03-13 at 16:08 -0700, Jakub Kicinski wrote:
> 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.

Thanks for your suggestion. But the same suggestion has been discussed
in previous patch v2: 
https://patchwork.kernel.org/project/netdevbpf/patch/20221108105352.89801-1-haozhe.chang@mediatek.com/

The opinion from Loic: "I think 6 is still fine, if we need more fields
in the future we can always have a port_config struct as a parameter
instead."

BR