[dpdk-dev] [PATCH 2/5] mbuf: use the reserved 16 bits for double vlan

[Ananyev, Konstantin]

Hi Stephen,

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Stephen Hemminger
> Sent: Tuesday, May 26, 2015 3:55 PM
> To: Zhang, Helin
> Cc: dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH 2/5] mbuf: use the reserved 16 bits for double vlan
> 
> On Tue, 26 May 2015 16:36:37 +0800
> Helin Zhang <helin.zhang at intel.com> wrote:
> 
> > Use the reserved 16 bits in rte_mbuf structure for the outer vlan,
> > also add QinQ offloading flags for both RX and TX sides.
> >
> > Signed-off-by: Helin Zhang <helin.zhang at intel.com>
> 
> Yet another change that is much needed, but breaks ABI compatibility.

Why do you think it breaks ABI compatibility?
As I can see, it uses field that was reserved.
Konstantin