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Date: Mon, 30 Jan 2023 19:02:18 -0800
From: Stephen Hemminger <stephen@networkplumber.org>
To: Rongwei Liu <rongweil@nvidia.com>
Cc: <matan@nvidia.com>, <viacheslavo@nvidia.com>, <orika@nvidia.com>,
 <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>, <rasland@nvidia.com>
Subject: Re: [PATCH v3 1/8] ethdev: add IPv6 routing extension header
 definition
Message-ID: <20230130190218.0f6b1b5c@hermes.local>
In-Reply-To: <20230130035941.1495874-2-rongweil@nvidia.com>
References: <5da6632a-0976-dc1f-facb-f778c8aad8e6@oktetlabs.ru>
 <20230130035941.1495874-1-rongweil@nvidia.com>
 <20230130035941.1495874-2-rongweil@nvidia.com>
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Errors-To: dev-bounces@dpdk.org

On Mon, 30 Jan 2023 05:59:33 +0200
Rongwei Liu <rongweil@nvidia.com> wrote:

> +/**
> + * @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;
> +};

The problem with nesting a variable length structure inside
another structure is not allowed.

The issue is that the applicaiton would have to pass a variable
length structure in for the flow definition. The flow item is
variable length for this type? all the others are fixed length.

One option would be to get rid of the wrapper structure.