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

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Date:	Tue, 07 Jan 2014 12:04:02 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Or Gerlitz <or.gerlitz@...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, 2014-01-07 at 21:43 +0200, Or Gerlitz wrote:
> 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()
> --

So if we use same port, it seems to me udp_del_offload() of the first
dismantled tunnel will remove the offload for the remaining tunnel.

You forgot to implement a refcount somehow.



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