Re: [PATCH v5 2/8]i40e:support VxLAN packet identification in librte_pmd_i40e

[Thomas Monjalon <thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>]

2014-10-17 05:58, Liu, Jijiang:
> From: Thomas Monjalon [mailto:thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org]
> > 2014-10-11 13:55, Jijiang Liu:
> > >  #
> > > +# Compile tunneling UDP port support
> > > +#
> > > +CONFIG_RTE_LIBRTE_TUNNEL_UDP_PORT=4789
> > > +
> > > +#
> > 
> > 1) this option is not to "Compile tunneling UDP port support"
> Change the comment as "tunneling UDP default port configuration"
> > 2) why is it a compile time option? should it be an API parameter or a
> > runtime option?
> 
> In terms of VxLAN, "IANA has assigned the value 4789 for the VXLAN UDP port,
> and this value SHOULD be used by default as the destination UDP port.
> Some early implementations of VXLAN have used other values for the
> destination port. To enable interoperability with these implementations,
> the destination port SHOULD be configurable."

Please, do not consider a compile time option like "configurable".
There are some cases where the user cannot or don't want to rebuild DPDK.

> I have provided a API to configure UDP port.

OK, good.

> But a default UDP port number is needed where PF startup if current mode is
> VxLAN mode.

Sorry, I don't understand this part.
Why are you adding a default tunnel when initializing?
Is it not enough to allow adding new tunnels with custom port?

-- 
Thomas