netdev - Re: [PATCH net v2] sctp: start t5 timer only when peer.rwnd is 0 and local.state is SHUTDOWN

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Message-ID: <CADvbK_eZfJpQtvM_zTyS=3yTuCkdK0RM-zbMbFvUx5L-U9u5jQ@mail.gmail.com>
Date:	Thu, 27 Aug 2015 22:49:06 +0800
From:	lucien xin <lucien.xin@...il.com>
To:	Vlad Yasevich <vyasevic@...hat.com>
Cc:	Marcelo Ricardo Leitner <mleitner@...hat.com>,
	network dev <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...radead.org>, davem <davem@...emloft.net>
Subject: Re: [PATCH net v2] sctp: start t5 timer only when peer.rwnd is 0 and
 local.state is SHUTDOWN_PENDING

>
> So one potential way is to have peer.rwnd and peer.a_rwnd, where peer.a_rwnd is
> the window advertised by peer and peer.rwnd and our estimation based on peer.a_rwnd.
> This way we will always know where we stand.
>
> Although I am not sure yet if we want to grow the peer structure any more.
>
> Another way is to have an estimate or 0-window probe bit/flags one the send side
> and set it when we do 0-window probe.  This way we'd know that when 0-window probe
> bit is set, peer returned 0 window.
>
I think updating 0-window may happen in sctp_process_init() and
sctp_outq_sack(),
I don't think 0-window can be probed, cause unreachable and closing
window both has
no reply from peer. but we can update the 0-window bit in those two
functions. I just do
not know where there is a available bit we can use if won't change the
peer structure.

> Just some thoughts.
> -vlad
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