netdev - Re: [PATCH net-next 2/7] net: nexthop: Add NHA_OP

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Message-ID: <20240227193458.38a79c56@kernel.org>
Date: Tue, 27 Feb 2024 19:34:58 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Petr Machata <petrm@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 <netdev@...r.kernel.org>, Ido Schimmel <idosch@...dia.com>, "David Ahern"
 <dsahern@...nel.org>, <mlxsw@...dia.com>
Subject: Re: [PATCH net-next 2/7] net: nexthop: Add NHA_OP_FLAGS

On Tue, 27 Feb 2024 19:17:27 +0100 Petr Machata wrote:
> +	/* bitfield32; operation-specific flags */
> +	NHA_OP_FLAGS,

>  static const struct nla_policy rtm_nh_policy_get[] = {
>  	[NHA_ID]		= { .type = NLA_U32 },
> +	[NHA_OP_FLAGS]		= NLA_POLICY_BITFIELD32(0),

Why bitfiled? You never use the mask.
bitfield gives you the ability to do RMW "atomically" on object fields.
For op flags I don't think it makes much sense.