netdev - Re: [PATCH net-next v5] net: openvswitch: IPv6: Add IPv6 extension header support

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Message-ID: <e4bb09d1-8c8f-bfdf-1582-9dd8c560411b@6wind.com>
Date:   Tue, 28 Sep 2021 16:51:40 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Cpp Code <cpp.code.lv@...il.com>
Cc:     netdev@...r.kernel.org, pshelar@....org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        ovs dev <dev@...nvswitch.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v5] net: openvswitch: IPv6: Add IPv6 extension
 header support

Le 27/09/2021 à 21:12, Cpp Code a écrit :
> To use this code there is a part of code in the userspace. We want to
> keep compatibility when we only update userspace part code or only
> kernel part code. This means we should have same values for constants
> and we can only add new ones at the end of list.
All attributes after OVS_KEY_ATTR_CT_STATE (ie 7 attributes) were added before
OVS_KEY_ATTR_TUNNEL_INFO.
Why is it not possible anymore?


Regards,
Nicolas

> 
> Best,
> Tom
> 
> On Wed, Sep 22, 2021 at 11:02 PM Nicolas Dichtel
> <nicolas.dichtel@...nd.com> wrote:
>>
>> Le 20/09/2021 à 20:20, Toms Atteka a écrit :
>>> 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 |  12 +++
>>>  net/openvswitch/flow.c           | 140 +++++++++++++++++++++++++++++++
>>>  net/openvswitch/flow.h           |  14 ++++
>>>  net/openvswitch/flow_netlink.c   |  24 +++++-
>>>  4 files changed, 189 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
>>> index a87b44cd5590..dc6eb5f6399f 100644
>>> --- a/include/uapi/linux/openvswitch.h
>>> +++ b/include/uapi/linux/openvswitch.h
>>> @@ -346,6 +346,13 @@ enum ovs_key_attr {
>>>  #ifdef __KERNEL__
>>>       OVS_KEY_ATTR_TUNNEL_INFO,  /* struct ip_tunnel_info */
>>>  #endif
>>> +
>>> +#ifndef __KERNEL__
>>> +     PADDING,  /* Padding so kernel and non kernel field count would match */
>>> +#endif
>>> +
>>> +     OVS_KEY_ATTR_IPV6_EXTHDRS,  /* struct ovs_key_ipv6_exthdr */
>> Naive question, why not moving OVS_KEY_ATTR_IPV6_EXTHDRS above
>> OVS_KEY_ATTR_TUNNEL_INFO?
>>
>>
>>
>> Regards,
>> Nicolas