ECN+ Implementation

[Pavan Vachhani]

Hi Richard,

Thanks for pointing out. Yes, I'll do that but I have a doubt.
Currently, I'm planning to complete ECN+ and ECN+/Wait(where it waits for
1rtt before retransmission, instead of time-out) as they are part of my
course projects. Then I'll also work on ECN++.

So, in sysctl, there is *tcp_do_ecn* which has values as
0: Legacy ECN disabled
1: System will try to initiate ECN enabled connection.
2: Server will not not initiate ECN enabled connection but allow ECN if
client wants it.

So now, for ECN+, should I add new value '3' to *tcp_do_ecn *or make some
new variable which can enabled only if *tcp_do_ecn* == 1?

On Mon 5 Nov, 2018, 7:56 AM Scheffenegger, Richard, <
Richard.Scheffenegger at netapp.com> wrote:

> Hi Pavan,
>
> Try to make this behavior change dependent on a sysctl, possibly with 3
> different settings (legacy, ECN+, ECN++):
>
> You may also want to look at ECN++
> https://tools.ietf.org/html/draft-ietf-tcpm-generalized-ecn-03
>
> Especially when you are looking to deploy this in Datacenters in
> conjunction with DCTCP.
>
> Best regards,
>    Richard
>
> -----Original Message-----
> From: owner-freebsd-net at freebsd.org <owner-freebsd-net at freebsd.org> On
> Behalf Of Pavan Vachhani
> Sent: Samstag, 3. November 2018 20:33
> To: freebsd-net at freebsd.org
> Subject: ECN+ Implementation
>
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>
>
> Hi,
> I am trying to implement ECN+ (rfc5562 <
> https://tools.ietf.org/html/rfc5562>)
> in FreeBSD.
> I am not able to figure out the code where SYN and SYN+ACK is sent and
> received.
> Please guide me to correct part of code. It was looking into tcp_input.c
> and tcp_output.c but couldn't get it for sure.
> Sorry for simple questions, I am a beginner.
>
> Thanks in advance.
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