netdev - Re: [PATCH 1/4] net: if_arp: add ARPHRD

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Date:   Fri, 25 Jun 2021 14:01:07 +0800
From:   Rocco Yue <rocco.yue@...iatek.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>, <netdev@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <bpf@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, <chao.song@...iatek.com>,
        <kuohong.wang@...iatek.com>, Rocco Yue <rocco.yue@...iatek.com>
Subject: Re: [PATCH 1/4] net: if_arp: add ARPHRD_PUREIP type

> Does changelog mean adding these details to the commit message ?
> 
> Yes please.
> 

will do.

> > > And are these user-visable flags documented in a man page or something
> > > else somewhere?  If not, how does userspace know about them?
> > > 
> > 
> > There are mappings of these device types value in the libc:
> > "/bionic/libc/kernel/uapi/linux/if_arp.h".
> > userspace can get it from here.
> 
> Yes, they will show up in a libc definition, but where is it documented
> in text form what the flag does?

Judging from the changes of ARPHRD_xxx submitted before, I am sorry
I could not find the corresponding doucuments to describe their 
respective behaviors in details. Perhaps the best way to understand
their behaviors is to read the code directly.

Thanks,
Rocco