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Date:   Tue, 20 Jul 2021 12:50:36 +0200
From:   Jakub Kicinski <kuba@kernel.org>
To:     Xin Long <lucien.xin@gmail.com>
Cc:     network dev <netdev@vger.kernel.org>, davem@davemloft.net,
        linux-sctp@vger.kernel.org,
        Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
        timo.voelker@fh-muenster.de
Subject: Re: [PATCH net 2/2] sctp: send pmtu probe only if packet loss in
 Search Complete state
Message-ID: <20210720125036.29ed23ba@cakuba>
In-Reply-To: <b27420c3db63969d3faf00a2e866126dae3b870c.1626713549.git.lucien.xin@gmail.com>
References: <cover.1626713549.git.lucien.xin@gmail.com>
        <b27420c3db63969d3faf00a2e866126dae3b870c.1626713549.git.lucien.xin@gmail.com>
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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@gmail.com>

Can we get a Fixes tag, please?