netdev - Re: [PATCH net-next 00/14] sctp: implement RFC8899: Packetization Layer Path MTU Discovery for SCTP transport

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Message-ID: <YNE9KTlOkzUjgr4c@horizon.localdomain>
Date:   Mon, 21 Jun 2021 22:30:17 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, davem@...emloft.net,
        kuba@...nel.org, linux-sctp@...r.kernel.org
Subject: Re: [PATCH net-next 00/14] sctp: implement RFC8899: Packetization
 Layer Path MTU Discovery for SCTP transport

On Sun, Jun 20, 2021 at 09:38:35PM -0400, Xin Long wrote:
> Overview(From RFC8899):
> 
>   In contrast to PMTUD, Packetization Layer Path MTU Discovery
>   (PLPMTUD) [RFC4821] introduces a method that does not rely upon
>   reception and validation of PTB messages.  It is therefore more
>   robust than Classical PMTUD.  This has become the recommended
>   approach for implementing discovery of the PMTU [BCP145].
> 
>   It uses a general strategy in which the PL sends probe packets to
>   search for the largest size of unfragmented datagram that can be sent
>   over a network path.  Probe packets are sent to explore using a
>   larger packet size.  If a probe packet is successfully delivered (as
>   determined by the PL), then the PLPMTU is raised to the size of the
>   successful probe.  If a black hole is detected (e.g., where packets
>   of size PLPMTU are consistently not received), the method reduces the
>   PLPMTU.

Thanks Xin!

Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>