netdev - Re: [PATCH net-next] docs: netlink: clarify the historical baggage of Netlink flags

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Message-ID: <d93ee260-9199-b760-40fe-f3d61a0af701@6wind.com>
Date:   Wed, 28 Sep 2022 10:55:34 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Florent Fourcot <florent.fourcot@...irst.fr>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com
Cc:     Johannes Berg <johannes@...solutions.net>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Guillaume Nault <gnault@...hat.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: Re: [PATCH net-next] docs: netlink: clarify the historical baggage of
 Netlink flags


Hello,

Le 28/09/2022 à 10:04, Florent Fourcot a écrit :
> Hello,
> 
> About NLM_F_EXCL, I'm not sure that my comment is relevant for your intro.rst
> document, but it has another usage in ipset submodule. For IPSET_CMD_DEL,
> setting NLM_F_EXCL means "raise an error if entry does not exist before the
> delete".
So NLM_F_EXCL could be used with DEL command for netfilter netlink but cannot be
used (it overlaps with NLM_F_BULK, see [1]) with DEL command for rtnetlink.
Sigh :(

[1] https://lore.kernel.org/netdev/0198618f-7b52-3023-5e9f-b38c49af1677@6wind.com/


Regards,
Nicolas