[PATCH v4] net: add bit fields to IPv6 header definition

[Morten Brørup]

> From: Gregory Etelson [mailto:getelson at nvidia.com]
> 
> DPDK IPv6 header definition combined the `version`, `traffic class`
> and `flow label` header fields into a single 32 bits structure member
> `vtc_flow`.
> 
> The patch expands IPv6 header definition with dedicated structure
> members for the `version`, `traffic class` and `flow label` fields.
> The `traffic class` is also separated into DS and ECN fields.
> 
> The patch also preserves existing `vtc_flow` structure member for
> backward compatibility.
> 
> Signed-off-by: Gregory Etelson <getelson at nvidia.com>
> ---

Reviewed-by: Morten Brørup <mb at smartsharesystems.com>