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From: Eric Dumazet <edumazet@google.com>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	Yuchung Cheng <ycheng@google.com>,
	Jonathan Rajotte-Julien <joraj@efficios.com>
Subject: Re: [regression] TCP_MD5SIG on established sockets
Date: Tue, 30 Jun 2020 14:23:44 -0700	[thread overview]
Message-ID: <CANn89iKK2+pznYZoKZzdCu4qkA7BjJZFqc6ABof4iaS-T-9_aw@mail.gmail.com> (raw)
In-Reply-To: <474095696.17969.1593551866537.JavaMail.zimbra@efficios.com>

On Tue, Jun 30, 2020 at 2:17 PM Mathieu Desnoyers
<mathieu.desnoyers@efficios.com> wrote:
>
> ----- On Jun 30, 2020, at 4:56 PM, Eric Dumazet edumazet@google.com wrote:
>
> > On Tue, Jun 30, 2020 at 1:44 PM David Miller <davem@davemloft.net> wrote:
> >>
> >> From: Eric Dumazet <edumazet@google.com>
> >> Date: Tue, 30 Jun 2020 13:39:27 -0700
> >>
> >> > The (C) & (B) case are certainly doable.
> >> >
> >> > A) case is more complex, I have no idea of breakages of various TCP
> >> > stacks if a flow got SACK
> >> > at some point (in 3WHS) but suddenly becomes Reno.
> >>
> >> I agree that C and B are the easiest to implement without having to
> >> add complicated code to handle various negotiated TCP option
> >> scenerios.
> >>
> >> It does seem to be that some entities do A, or did I misread your
> >> behavioral analysis of various implementations Mathieu?
> >>
> >> Thanks.
> >
> > Yes, another question about Mathieu cases is do determine the behavior
> > of all these stacks vs :
> > SACK option
> > TCP TS option.
>
> I will ask my customer's networking team to investigate these behaviors,
> which will allow me to prepare a thorough reply to the questions raised
> by Eric and David. I expect to have an answer within 2-3 weeks at most.
>
> Thank you!


Great, I am working on adding back support for (B) & (C) by the end of
this week.

  reply	other threads:[~2020-06-30 21:24 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-13 19:38 [regression] TC_MD5SIG on established sockets Mathieu Desnoyers
2020-05-13 19:49 ` Eric Dumazet
2020-05-13 19:56   ` Eric Dumazet
2020-06-29 19:43     ` [regression] TCP_MD5SIG " Mathieu Desnoyers
2020-06-29 20:47       ` Eric Dumazet
2020-06-30 19:43         ` Linus Torvalds
2020-06-30 19:52           ` Linus Torvalds
2020-06-30 20:34             ` Mathieu Desnoyers
2020-06-30 20:39               ` Eric Dumazet
2020-06-30 20:44                 ` David Miller
2020-06-30 20:56                   ` Eric Dumazet
2020-06-30 21:17                     ` Mathieu Desnoyers
2020-06-30 21:23                       ` Eric Dumazet [this message]
2020-06-30 21:54                         ` Eric Dumazet
2020-06-30 22:07                           ` Eric Dumazet
2020-06-30 22:38                             ` Eric Dumazet
2020-06-30 23:44                               ` Mathieu Desnoyers
2020-07-01  0:01                                 ` Eric Dumazet
2020-07-01  2:02                               ` Herbert Xu
2020-07-01  2:17                                 ` Eric Dumazet
2020-07-01  2:22                                   ` Herbert Xu
2020-07-01  2:30                                     ` Eric Dumazet
2020-07-01  2:39                                       ` Joe Perches
2020-07-01  2:58                                       ` Herbert Xu
2020-07-01  3:36                                         ` Eric Dumazet
2020-07-01  3:50                                           ` Herbert Xu
2020-07-01 12:19                                           ` Mathieu Desnoyers
2020-07-01 15:15                                             ` Eric Dumazet
2020-07-01 17:24                             ` Eric Dumazet
2020-06-30 20:21           ` David Miller
2020-06-30 20:30             ` Eric Dumazet
2020-06-30 20:39               ` Mathieu Desnoyers

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