netdev - Re: [PATCH iproute2-next v3 8/8] iplink: Reduce number of arguments to iplink

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Date:   Mon, 26 Feb 2018 20:38:22 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next v3 8/8] iplink: Reduce number of arguments
 to iplink_parse()

David Ahern wrote:
> On 2/26/18 11:20 AM, Serhey Popovych wrote:
>> Stephen Hemminger wrote:
>>> On Thu, 22 Feb 2018 15:02:06 +0200
>>> Serhey Popovych <serhe.popovych@...il.com> wrote:
>>>
>>>> +struct iplink_parse_args {
>>>> +	const char *dev;
>>>> +	const char *name;
>>>> +	const char *type;
>>>> +
>>>> +	/* This definitely must be the last one and initialized
>>>> +	 * by the caller of iplink_parse() that will initialize rest.
>>>> +	 */
>>>> +	struct iplink_req *req;
>>>> +};
>>>> +
>>>
>>> No control block please.
>> Accepted.
>>
>>> If you have too many arguments, then that means you need to do
>>> some refactoring.
>>
>> So using structure as single argument to a function isn't an option?
>>
>>>
>>
>>
> 
> As I mentioned before, iplink_parse should not be used by vxcan or veth
> as they only want a subset of the parsing. Once you take those users
> out, iplink_parse becomes local to iplink.c with a single user. In which
> case I suspect the compiler will always inline the function so no
> refactoring on the number of arguments is needed.
> 
I will implement cut down function to parse vxcan and veth peer device
parameters and reuse it in iplink_parse() to avoid code duplications.

But my final goal not to refactor on number of arguments to parse,
that's side product of this series, I want to take @name, @dev and
other parameters for later use. In ->parse_opt() modules @name, @dev
and others are not available easily. It seems only way to get them is
to parse supplied netlink buffer.





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