netdev - Re: [PATCHv5 net-next 3/4] rtnetlink: Honour NLM_F_ECHO flag in rtnl_newlink

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Message-ID: <20220930164251.GG10057@localhost.localdomain>
Date:   Fri, 30 Sep 2022 18:42:51 +0200
From:   Guillaume Nault <gnault@...hat.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, "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>,
        David Ahern <dsahern@...nel.org>
Subject: Re: [PATCHv5 net-next 3/4] rtnetlink: Honour NLM_F_ECHO flag in
 rtnl_newlink_create

On Fri, Sep 30, 2022 at 05:45:05PM +0800, Hangbin Liu wrote:
> This patch use the new helper rtnl_configure_link_notify() for
> rtnl_newlink_create(), so that the kernel could reply unicast
> when userspace set NLM_F_ECHO flag to request the new created
> interface info.
> 
> Suggested-by: Guillaume Nault <gnault@...hat.com>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  net/core/rtnetlink.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 1558921bd4da..da9a6fd156d8 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -3318,10 +3318,12 @@ static int rtnl_group_changelink(const struct sk_buff *skb,
>  static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
>  			       const struct rtnl_link_ops *ops,
>  			       struct nlattr **tb, struct nlattr **data,
> -			       struct netlink_ext_ack *extack)
> +			       struct netlink_ext_ack *extack,
> +			       struct nlmsghdr *nlh)

'nlh' could be const here too. Also, since we've started being picky
about the order of parameters, let's put 'nlh' right before 'tb' to
follow what other functions generally do.

>  {
>  	unsigned char name_assign_type = NET_NAME_USER;
>  	struct net *net = sock_net(skb->sk);
> +	u32 pid = NETLINK_CB(skb).portid;

s/pid/portid/