netdev - Re: [PATCH net-next V2 3/3] net: Add GRO support for vxlan traffic

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Message-ID: <CAJZOPZ+8bNi+HZ=eyGBwzFDdrkroMVyPzoGERFqcnZPq3rBZ6Q@mail.gmail.com>
Date:	Tue, 7 Jan 2014 21:43:55 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Or Gerlitz <ogerlitz@...lanox.com>, Jerry Chu <hkchu@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Yan Burman <yanb@...lanox.com>,
	Shlomo Pongratz <shlomop@...lanox.com>
Subject: Re: [PATCH net-next V2 3/3] net: Add GRO support for vxlan traffic

On Tue, Jan 7, 2014 at 6:34 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2014-01-07 at 17:29 +0200, Or Gerlitz wrote:
>> Add gro handlers for vxlan using the udp gro infrastructure
>>
>
>
>>  static void vxlan_notify_add_rx_port(struct sock *sk)
>>  {
>> @@ -568,6 +661,8 @@ static void vxlan_notify_add_rx_port(struct sock *sk)
>>                       dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
>>                                                           port);
>>       }
>> +     if (sa_family == AF_INET)
>> +             udp_add_offload(&vxlan_offload, port);
>>       rcu_read_unlock();
>>  }
>>
>
> This means two vxlan tunnels can not share same port.
> Is that a valid assertion ?

nope -- the vxlan driver opens a listener udp socket per per listening
port, but N > 1 vxlan tunnels can sit on that port, the driver does
further demuxing based on the vnid carried in the vxlan header, see
the call to vxlan_find_vni() from vxlan_rcv()
--
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