netdev - Re: [PATCH v1 net-next 3/8] rtnetlink: Add peer_type in struct rtnl_link

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Message-ID: <20241105170447.1d32beda@kernel.org>
Date: Tue, 5 Nov 2024 17:04:47 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: <andrew+netdev@...n.ch>, <daniel@...earbox.net>, <davem@...emloft.net>,
 <edumazet@...gle.com>, <horms@...nel.org>, <kuni1840@...il.com>,
 <mailhol.vincent@...adoo.fr>, <mkl@...gutronix.de>,
 <netdev@...r.kernel.org>, <pabeni@...hat.com>, <razor@...ckwall.org>
Subject: Re: [PATCH v1 net-next 3/8] rtnetlink: Add peer_type in struct
 rtnl_link_ops.

On Tue, 5 Nov 2024 16:58:25 -0800 Kuniyuki Iwashima wrote:
> > > I guess compiler will warn if someone tries to use < 255  
> > 
> > I chose 1 just because all of the three peer attr types were 1.  
> 
> s/chose 1/chose u8/ :)
> 
> 
> > Should peer_type be u16 or extend when a future device use >255 for
> > peer ifla ?

I think we can extend in the future if you're doing this for packing
reasons. Barely any family has more attrs than 256 and as I replied to
myself we will assign a constant so compiler will warn us.