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From: Jon Mason <jdmason@kudzu.us>
Date: Mon, 27 Nov 2017 11:39:13 -0500
Message-ID: <CAPoiz9zzL6jZeCa4o+AQN2j8J-5nMxQkojWdVEAb96==+v+awg@mail.gmail.com>
Subject: Re: Ntb Transport Driver Problem After Power-up
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To: ThanhTuThai <cruisethai@gmail.com>
Cc: linux-ntb <linux-ntb@googlegroups.com>
List-ID: <linux-ntb.googlegroups.com>

(Ccing NTB mailing list)

On Sun, Nov 19, 2017 at 9:36 PM, ThanhTuThai <cruisethai@gmail.com> wrote:
> Dear Jon,
>
> We are using Ntb_transport driver from Linux with Microsemi's ntb hardware.
> We get a problem when one peer suddenly power off without removing the
> drivers, after it powers up again, the good peer cannot reconnect with it
> again, the good peer need to reload the drivers in order to reconnect to it.
> I guess the good peer need to re-init some thing in order to catch up with
> another one, but I don't what it is.
>
> I knew that, when one peer starts, the driver will send out a message
> through doorbell, when another peer catch that message, I can announce the
> ntb_transport link-down ( ntb_link_event(&sndev->ntb); ).
>
> But in this case, when one peer power down and up the good peer don't
> receive any message from it in the interrupt (switchtec_ntb_message_isr),
> although I have check that, it already sent out the message.
>
> Do you have any idea about it ?

It sounds like the link down/up isn't working properly.  Is the
Microsemi NTB not able to detect a link down?

Thanks,
Jon

>
> Thank you very much !