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

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Message-ID: <20240308194334.52236cef@kernel.org>
Date: Fri, 8 Mar 2024 19:43:34 -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 Fri, 8 Mar 2024 14:58:59 -0800 Stephen Hemminger wrote:
> > +static inline __u64 rta_getattr_uint(const struct rtattr *rta)
> > +{
> > +	if (RTA_PAYLOAD(rta) == sizeof(__u32))
> > +		return rta_getattr_u32(rta);
> > +	return rta_getattr_u64(rta);  
> 
> 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.