netdev - Re: [PATCH iproute2] vxlan: allow specifying multiple default destinations

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Date:	Wed, 29 May 2013 13:52:55 +0300
From:	Mike Rapoport <mike.rapoport@...ellosystems.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] vxlan: allow specifying multiple default destinations

On Wed, May 29, 2013 at 1:13 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Wed, 29 May 2013 at 10:00 GMT, Mike Rapoport <mike.rapoport@...ellosystems.com> wrote:
>> Signed-off-by: Mike Rapoport <mike.rapoport@...ellosystems.com>
>> ---
>>  ip/iplink_vxlan.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 125 insertions(+)
>>
>> diff --git a/ip/iplink_vxlan.c b/ip/iplink_vxlan.c
>> index 1025326..be6c0ac 100644
>> --- a/ip/iplink_vxlan.c
>> +++ b/ip/iplink_vxlan.c
>> @@ -28,11 +28,87 @@ static void explain(void)
>>       fprintf(stderr, "                 [ port MIN MAX ] [ [no]learning ]\n");
>>       fprintf(stderr, "                 [ [no]proxy ] [ [no]rsc ]\n");
>>       fprintf(stderr, "                 [ [no]l2miss ] [ [no]l3miss ]\n");
>> +     fprintf(stderr, "                 [ dstadd DST ]\n");
>> +     fprintf(stderr, "                 [ dstdel ADDR ]\n");
>
> Excuse me, but this looks like a design failure as you manipulate
> remotes with `ip link` while creating vxlan devices, shouldn't this be
> in a standard alone tool if we can't reuse any existing tool? Or am I
> missing anything?

Frankly, I had a long hesitation about the userspace implementation.
>From one side it seems very logical to use ip/iplink_vxlan for vxlan
device manipulations. Moreover, since the remotes are used pretty much
the same way as the group address, adding the remotes management to
ip/iplink_vxlan makes a lot of sense. Besides, creation of stand alone
tool for remote list manipulation in vxlan seemed to me little bit far
fetched.

On the other hand, I quite agree with you that
ip link add vxlan0 ... dstadd 192.168.1.1
or
ip link set vxlan0 ... dstdel 192.168.1.1
looks weird at least.

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--
Sincerely yours,
Mike.
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