netdev - Re: [PATCH iproute2-next 1/4] libnetlink: Add rta_getattr

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Message-ID: <20240309103758.7bd0c249@kernel.org>
Date: Sat, 9 Mar 2024 10:37:58 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Stephen Hemminger <stephen@...workplumber.org>
Cc: Petr Machata <petrm@...dia.com>, David Ahern <dsahern@...nel.org>,
 <netdev@...r.kernel.org>, Ido Schimmel <idosch@...dia.com>,
 <mlxsw@...dia.com>
Subject: Re: [PATCH iproute2-next 1/4] libnetlink: Add rta_getattr_uint()

On Sat, 9 Mar 2024 09:21:58 -0800 Stephen Hemminger wrote:
> > > Don't understand the use case here.
> > > The kernel always sends the same payload size for the same attribute.    
> > 
> > Please see commit 374d345d9b5e13380c in the kernel.  
> 
> Ok, but maybe go further and handle u16 and u8

I guess you can if that's helpful in iproute2, as a "universal getter",
cost of a few branches. In the kernel I try hard to convince people to
never use u8 and u16 as they simply waste space on padding, and the bits
may turn out to be needed later.