netdev - Re: [PATCH net 2/2] sctp: send pmtu probe only if packet loss in Search Complete state

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Date:   Tue, 20 Jul 2021 10:16:12 -0400
From:   Xin Long <lucien.xin@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     network dev <netdev@...r.kernel.org>, davem <davem@...emloft.net>,
        "linux-sctp @ vger . kernel . org" <linux-sctp@...r.kernel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Timo Völker <timo.voelker@...muenster.de>
Subject: Re: [PATCH net 2/2] sctp: send pmtu probe only if packet loss in
 Search Complete state

On Tue, Jul 20, 2021 at 6:50 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 19 Jul 2021 12:53:23 -0400, Xin Long wrote:
> > This patch is to introduce last_rtx_chunks into sctp_transport to detect
> > if there's any packet retransmission/loss happened by checking against
> > asoc's rtx_data_chunks in sctp_transport_pl_send().
> >
> > If there is, namely, transport->last_rtx_chunks != asoc->rtx_data_chunks,
> > the pmtu probe will be sent out. Otherwise, increment the pl.raise_count
> > and return when it's in Search Complete state.
> >
> > With this patch, if in Search Complete state, which is a long period, it
> > doesn't need to keep probing the current pmtu unless there's data packet
> > loss. This will save quite some traffic.
> >
> > Signed-off-by: Xin Long <lucien.xin@...il.com>
>
> Can we get a Fixes tag, please?
Fixes: 0dac127c0557 ("sctp: do black hole detection in search complete state")

Should I repost?