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

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Date:   Wed, 23 Jun 2021 19:19:51 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Rocco Yue <rocco.yue@...iatek.com>
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,
        zhuoliang.zhang@...iatek.com, kuohong.wang@...iatek.com
Subject: Re: [PATCH 1/4] net: if_arp: add ARPHRD_PUREIP type

On Wed, Jun 23, 2021 at 07:34:49PM +0800, Rocco Yue wrote:
> This patch add the definition of ARPHRD_PUREIP which can for
> example be used by mobile ccmni device as device type.
> ARPHRD_PUREIP means that this device doesn't need kernel to
> generate ipv6 link-local address in any addr_gen_mode.
> 
> Signed-off-by: Rocco Yue <rocco.yue@...iatek.com>
> ---
>  include/uapi/linux/if_arp.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/uapi/linux/if_arp.h b/include/uapi/linux/if_arp.h
> index c3cc5a9e5eaf..4463c9e9e8b4 100644
> --- a/include/uapi/linux/if_arp.h
> +++ b/include/uapi/linux/if_arp.h
> @@ -61,6 +61,7 @@
>  #define ARPHRD_DDCMP    517		/* Digital's DDCMP protocol     */
>  #define ARPHRD_RAWHDLC	518		/* Raw HDLC			*/
>  #define ARPHRD_RAWIP    519		/* Raw IP                       */
> +#define ARPHRD_PUREIP	520		/* Pure IP			*/

In looking at the patches, what differs "PUREIP" from "RAWIP"?  It seems
to be the same to me.  If they are different, where is that documented?

thanks,

greg k-h