On 8 Jul 2021, at 21:23, Ilya Maximets wrote:

> On 6/10/21 11:24 AM, Eelco Chaudron wrote:
>> Currently, conntrack in the kernel has an undocumented feature referred
>> to as all-zero IP address SNAT. Basically, when a source port
>> collision is detected during the commit, the source port will be
>> translated to an ephemeral port. If there is no collision, no SNAT is
>> performed.
>>
>> This patchset documents this behavior and adds a self-test to verify
>> it's not changing. In addition, a datapath feature flag is added for
>> the all-zero IP SNAT case. This will help applications on top of OVS,
>> like OVN, to determine this feature can be used.
>>
>> Signed-off-by: Eelco Chaudron <[email protected]>
>> Acked-by: Aaron Conole <[email protected]>
>> Acked-by: Dumitru Ceara <[email protected]>
>> ---
>>
>> v5: Windows datapath does not support all-zero SNAT, add checks.
>> v4: Added datapath support flag for all-zero SNAT.
>> v3: Renamed NULL SNAT to all-zero IP SNAT.
>> v2: Fixed NULL SNAT to only work in the -rpl state to be inline with
>>     OpenShift-SDN's behavior.
>
>
> Thanks, everyone!  I added a NEWS entry and applied to master.

Can we also backport this patch? It’s not adding any new features, just the 
datapath support flag, and a unit test?

Thanks,

Eelco

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