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From: Rongwei Liu <rongweil@nvidia.com>
To: Stephen Hemminger <stephen@networkplumber.org>, Andrew Rybchenko
<andrew.rybchenko@oktetlabs.ru>
CC: Matan Azrad <matan@nvidia.com>, Slava Ovsiienko <viacheslavo@nvidia.com>,
Ori Kam <orika@nvidia.com>, "NBU-Contact-Thomas Monjalon (EXTERNAL)"
<thomas@monjalon.net>, Aman Singh <aman.deep.singh@intel.com>, Yuying Zhang
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Subject: RE: [PATCH v3 1/8] ethdev: add IPv6 routing extension header
definition
Thread-Topic: [PATCH v3 1/8] ethdev: add IPv6 routing extension header
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Date: Tue, 31 Jan 2023 03:24:35 +0000
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Errors-To: dev-bounces@dpdk.org
Hi Stephen
BR
Rongwei
> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Tuesday, January 31, 2023 11:02
> To: Rongwei Liu <rongweil@nvidia.com>
> Cc: Matan Azrad <matan@nvidia.com>; Slava Ovsiienko
> <viacheslavo@nvidia.com>; Ori Kam <orika@nvidia.com>; NBU-Contact-
> Thomas Monjalon (EXTERNAL) <thomas@monjalon.net>; Aman Singh
> <aman.deep.singh@intel.com>; Yuying Zhang <yuying.zhang@intel.com>;
> Ferruh Yigit <ferruh.yigit@amd.com>; Andrew Rybchenko
> <andrew.rybchenko@oktetlabs.ru>; Olivier Matz <olivier.matz@6wind.com>;
> dev@dpdk.org; Raslan Darawsheh <rasland@nvidia.com>
> Subject: Re: [PATCH v3 1/8] ethdev: add IPv6 routing extension header
> definition
>=20
> External email: Use caution opening links or attachments
>=20
>=20
> On Mon, 30 Jan 2023 05:59:33 +0200
> Rongwei Liu <rongweil@nvidia.com> wrote:
>=20
> > +/**
> > + * @warning
> > + * @b EXPERIMENTAL: this structure may change without prior notice
> > + *
> > + * RTE_FLOW_ITEM_TYPE_IPV6_ROUTING_EXT.
> > + *
> > + * Matches an IPv6 routing extension header.
> > + */
> > +struct rte_flow_item_ipv6_routing_ext {
> > + struct rte_ipv6_routing_ext hdr; };
>=20
> The problem with nesting a variable length structure inside another struc=
ture
> is not allowed.
>=20
> The issue is that the applicaiton would have to pass a variable length st=
ructure
> in for the flow definition. The flow item is variable length for this typ=
e? all the
> others are fixed length.
>=20
Yeah, segments_left is uint8 per definition. RFC doesn't set an upper limit=
ation.
It stands for intermediate routing nodes between src and dst nodes.
> One option would be to get rid of the wrapper structure.
Yeah, it works. @Andrew Rybchenko Can you share your preference here?