netdev - Re: [PATCH] iplink_geneve: add UDP destination port configuration at link creation

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Date:	Fri, 18 Sep 2015 09:15:56 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	netdev <netdev@...r.kernel.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Pravin B Shelar <pshelar@...ira.com>
Subject: Re: [PATCH] iplink_geneve: add UDP destination port configuration at
 link creation

On Fri, Sep 18, 2015 at 7:45 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Fri, 2015-09-18 at 10:26 -0400, John W. Linville wrote:
>> On Thu, Sep 17, 2015 at 01:49:49PM -0700, Eric Dumazet wrote:
>> > On Thu, 2015-09-17 at 15:27 -0400, John W. Linville wrote:
>> > > Signed-off-by: John W. Linville <linville@...driver.com>
>> > > ---
>> >
>> > >  }
>> > >
>> > > @@ -150,6 +159,10 @@ static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
>> > >           else
>> > >                   fprintf(f, "tos %#x ", tos);
>> > >   }
>> > > +
>> > > + if (tb[IFLA_GENEVE_PORT])
>> > > +         fprintf(f, "dstport %u ",
>> > > +                 ntohs(rta_getattr_u16(tb[IFLA_GENEVE_PORT])));
>> >
>> > This looks strange.
>> >
>> > Kernel does :
>> >
>> > if (nla_put_u16(skb, IFLA_GENEVE_PORT, ntohs(geneve->dst_port)))
>> >         goto nla_put_failure;
>>
>> Indeed, you are right.  I had essentially copied some vxlan code when
>> I did my version of adding the port attribute, and didn't take much
>> care when adapting that code for the version that actually got merged.
>>
>> The current geneve code is using host byte-order for the UDP port in
>> the netlink messages.  But, I see that vxlan, gre, iptnl, etc are using
>> network byte order for specifying UDP ports in their netlink stuff.
>> Should geneve follow that practice as well?  Or does it matter?
>
> It might be too late to change the ABI, as geneve is in linux-4.2

We might be in luck actually. Geneve itself came earlier but I think
the ability to specify the dest port is in 4.3 only, so we still have
a chance to make it consistent.
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