netdev - Re: [PATCH 3/3] vxlan: virtual extensible lan

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Message-ID: <CAEP_g=9Y3MmsABQJyi508FEgs4635tnaVqk4Ncwbpm41bLskhg@mail.gmail.com>
Date:	Wed, 3 Oct 2012 18:54:46 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] vxlan: virtual extensible lan

On Mon, Oct 1, 2012 at 3:32 PM, Stephen Hemminger <shemminger@...tta.com> wrote:
> --- /dev/null   1970-01-01 00:00:00.000000000 +0000
> +++ b/drivers/net/vxlan.c       2012-10-01 15:08:38.024499080 -0700
> +/* Transmit local packets over Vxlan
> + *
> + * Outer IP header inherits ECN and DF from inner header.
> + * Outer UDP destination is the VXLAN assigned port.
> + *           source port is based on hash of flow if available
> + *                       otherwise use a random value
> + */
> +static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
[...]
> +       hash = skb_get_rxhash(skb);
[...]
> +       uh->dest = htons(vxlan_port);
> +       uh->source = hash ? :random32();

I think this may lead to packet reordering in some cases.  If the
protocol is unknown then it may still represent part of a flow and
random source ports could lead to taking different paths.

Also, does it make sense to restrict the range of ports to, say, the
upper half of the range?
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