[ovs-dev] [RFC v4] Add TCP encap_rcv hook (repost)

[Jesse Gross]

On Mon, Apr 23, 2012 at 2:08 PM, David Miller <davem at davemloft.net> wrote:
> From: Jesse Gross <jesse at nicira.com>
> Date: Mon, 23 Apr 2012 13:53:42 -0700
>
>> On Mon, Apr 23, 2012 at 1:13 PM, David Miller <davem at davemloft.net> wrote:
>>> From: Jesse Gross <jesse at nicira.com>
>>> Date: Mon, 23 Apr 2012 13:08:49 -0700
>>>
>>>> Assuming that the TCP stack generates large TSO frames on transmit
>>>> (which could be the local stack; something sent by a VM; or packets
>>>> received, coalesced by GRO and then encapsulated by STT) then you can
>>>> just prepend the STT header (possibly slightly adjusting things like
>>>> requested MSS, number of segments, etc. slightly).  After that it's
>>>> possible to just output the resulting frame through the IP stack like
>>>> all tunnels do today.
>>>
>>> Which seems to potentially suggest a stronger intergration of the STT
>>> tunnel transmit path into our IP stack rather than the approach Simon
>>> is taking
>>
>> Did you have something in mind?
>
> A normal bonafide tunnel netdevice driver like GRE instead of the
> openvswitch approach Simon is using.

Ahh, yes, that I agree with.  Independent of this, there's work being
done to make it so that OVS can use the normal in-tree tunneling code
and not need its own.  Once that's done I expect that STT will follow
the same model.