netdev - Re: [PATCH net] geneve: show remote address and checksum info even after link down

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Date:   Tue, 14 Nov 2017 10:48:17 -0500
From:   Eric Garver <e@...g.me>
To:     Hangbin Liu <haliu@...hat.com>
Cc:     Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org,
        Pravin B Shelar <pshelar@....org>,
        "David S. Miller" <davem@...emloft.net>,
        Jiri Benc <jbenc@...hat.com>
Subject: Re: [PATCH net] geneve: show remote address and checksum info even
 after link down

On Tue, Nov 14, 2017 at 10:39:41AM +0800, Hangbin Liu wrote:
> Hi Eric,
> 
> Thanks for the comments.
> 
> On Mon, Nov 13, 2017 at 03:27:25PM -0500, Eric Garver wrote:
> > > Fixes: 11387fe4a98 ("geneve: fix fill_info when using collect_metadata")
> > > Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> > > ---
> > >  drivers/net/geneve.c | 28 +++++++++++-----------------
> > >  1 file changed, 11 insertions(+), 17 deletions(-)
> > > 
> > > diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
> > > index ed51018..b010db7 100644
> > > --- a/drivers/net/geneve.c
> > > +++ b/drivers/net/geneve.c
> > > @@ -1511,32 +1511,18 @@ static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
> > >  	if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
> > >  		goto nla_put_failure;
> > >  
> > > -	if (rtnl_dereference(geneve->sock4)) {
> > > +	if (ip_tunnel_info_af(info) == AF_INET) {
> > >  		if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
> > >  				    info->key.u.ipv4.dst))
> > >  			goto nla_put_failure;
> > >  
> > 
> > We can avoid passing up *_REMOTE{,6} for COLLECT_METADATA. They're
> > mutually exclusive.
> 
> Do you mean something like
> 
> +       bool metadata = geneve->collect_md;
> -       if (rtnl_dereference(geneve->sock4)) {
> +       if (!metadata && ip_tunnel_info_af(info) == AF_INET) {

Yes.

> > 
> > > -		if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
> > > -			       !!(info->key.tun_flags & TUNNEL_CSUM)))
> > > -			goto nla_put_failure;
> > > -
> > > -	}
> > > -
> > >  #if IS_ENABLED(CONFIG_IPV6)
> > > -	if (rtnl_dereference(geneve->sock6)) {
> > > +	} else {
> 
> and
> 
> -       if (rtnl_dereference(geneve->sock6)) {
> +       } else if (!metadata) {
> 
> ?

Yes.