From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
Subject: Re: [PATCH 2/5] mbuf: use the reserved 16 bits for
 double vlan
Date: Tue, 26 May 2015 15:02:51 +0000
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To: Stephen Hemminger <stephen@networkplumber.org>, "Zhang, Helin"
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Hi Stephen,

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Stephen Hemminger
> Sent: Tuesday, May 26, 2015 3:55 PM
> To: Zhang, Helin
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH 2/5] mbuf: use the reserved 16 bits for do=
uble vlan
>=20
> On Tue, 26 May 2015 16:36:37 +0800
> Helin Zhang <helin.zhang@intel.com> wrote:
>=20
> > 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@intel.com>
>=20
> 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