netdev - Re: [PATCHv3 net-next] rtnetlink: Honour NLM_F_ECHO flag in rtnl

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Date:   Wed, 28 Sep 2022 11:22:11 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Florent Fourcot <florent.fourcot@...irst.fr>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Guillaume Nault <gnault@...hat.com>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCHv3 net-next] rtnetlink: Honour NLM_F_ECHO flag in
 rtnl_{new, set, del}link

Hi Jakub,
On Tue, Sep 27, 2022 at 12:13:03PM +0800, Hangbin Liu wrote:
> @@ -3009,6 +3012,11 @@ static int do_setlink(const struct sk_buff *skb,
>  		}
>  	}
>  
> +	nskb = rtmsg_ifinfo_build_skb(RTM_NEWLINK, dev, 0, 0, GFP_KERNEL, NULL,
> +				      0, pid, nlh->nlmsg_seq);
> +	if (nskb)
> +		rtnl_notify(nskb, dev_net(dev), pid, RTNLGRP_LINK, nlh, GFP_KERNEL);

BTW, in do_setlink() I planed to use RTM_SETLINK. But I found iproute2 use
RTM_NEWLINK to set links. And I saw an old doc[1] said

"""
- RTM_SETLINK does not follow the usual rtnetlink conventions and ignores
  all netlink flags

The RTM_NEWLINK message type is a superset of RTM_SETLINK, it allows
to change both driver specific and generic attributes of the device.
"""

So I just use RTM_NEWLINK for the notification. Do you think if we should
use RTM_SETLINK?

[1] https://lwn.net/Articles/236919/

Thanks
Hangbin