linux-kernel - Re: [ovs-dev] [PATCH net-next v7] net: openvswitch: IPv6: Add IPv6 extension header support

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Message-ID: <1d0a5e90-b878-61a1-99af-35702b72f2d9@ovn.org>
Date:   Fri, 15 Oct 2021 15:56:36 +0200
From:   Ilya Maximets <i.maximets@....org>
To:     Toms Atteka <cpp.code.lv@...il.com>, netdev@...r.kernel.org,
        pshelar@....org, davem@...emloft.net, kuba@...nel.org,
        dev@...nvswitch.org, linux-kernel@...r.kernel.org
Cc:     i.maximets@....org, Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: Re: [ovs-dev] [PATCH net-next v7] net: openvswitch: IPv6: Add IPv6
 extension header support

On 10/14/21 23:18, Toms Atteka wrote:
> This change adds a new OpenFlow field OFPXMT_OFB_IPV6_EXTHDR and
> packets can be filtered using ipv6_ext flag.
> 
> Signed-off-by: Toms Atteka <cpp.code.lv@...il.com>
> ---
>  include/uapi/linux/openvswitch.h |  16 +++-
>  net/openvswitch/flow.c           | 140 +++++++++++++++++++++++++++++++
>  net/openvswitch/flow.h           |  14 ++++
>  net/openvswitch/flow_netlink.c   |  24 +++++-
>  4 files changed, 192 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
> index a87b44cd5590..763adf3dce23 100644
> --- a/include/uapi/linux/openvswitch.h
> +++ b/include/uapi/linux/openvswitch.h
> @@ -344,8 +344,17 @@ enum ovs_key_attr {
>  	OVS_KEY_ATTR_NSH,       /* Nested set of ovs_nsh_key_* */
>  
>  #ifdef __KERNEL__
> -	OVS_KEY_ATTR_TUNNEL_INFO,  /* struct ip_tunnel_info */
> +	OVS_KEY_ATTR_TUNNEL_INFO,/* struct ip_tunnel_info */
> +	__OVS_KEY_ATTR_PADDING_1,/* Padding to match field count with ovs */
>  #endif
> +
> +#ifndef __KERNEL__
> +	__OVS_KEY_ATTR_PADDING_2,/* Padding to match field count with ovs */
> +	__OVS_KEY_ATTR_PADDING_3,/* Padding to match field count with ovs */
> +#endif
> +
> +	OVS_KEY_ATTR_IPV6_EXTHDRS,  /* struct ovs_key_ipv6_exthdr */
> +
>  	__OVS_KEY_ATTR_MAX
>  };

Not a full review, but, I think, that we should not add paddings, and
define OVS_KEY_ATTR_IPV6_EXTHDRS before the OVS_KEY_ATTR_TUNNEL_INFO
instead.  See my comments for v6:
  https://lore.kernel.org/netdev/8c4ee3e8-0400-ee6e-b12c-327806f26dae@ovn.org/T/#u

Best regards, Ilya Maximets.