netdev - Re: [EXT] Re: [net-next PATCH 0/2] Introduce mbox tracepoints for Octeontx2

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Date:   Fri, 4 Sep 2020 10:37:09 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Sunil Kovvuri Goutham <sgoutham@...vell.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "sundeep.lkml@...il.com" <sundeep.lkml@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Subbaraya Sundeep Bhatta <sbhatta@...vell.com>
Subject: Re: [EXT] Re: [net-next PATCH 0/2] Introduce mbox tracepoints for
 Octeontx2

Fri, Sep 04, 2020 at 07:39:54AM CEST, sgoutham@...vell.com wrote:
>
>
>> -----Original Message-----
>> From: Jakub Kicinski <kuba@...nel.org>
>> Sent: Friday, September 4, 2020 12:48 AM
>> To: sundeep.lkml@...il.com
>> Cc: davem@...emloft.net; netdev@...r.kernel.org; Sunil Kovvuri Goutham
>> <sgoutham@...vell.com>; Subbaraya Sundeep Bhatta
>> <sbhatta@...vell.com>
>> Subject: [EXT] Re: [net-next PATCH 0/2] Introduce mbox tracepoints for
>> Octeontx2
>> 
>> External Email
>> 
>> ----------------------------------------------------------------------
>> On Thu,  3 Sep 2020 12:48:16 +0530 sundeep.lkml@...il.com wrote:
>> > From: Subbaraya Sundeep <sbhatta@...vell.com>
>> >
>> > This patchset adds tracepoints support for mailbox.
>> > In Octeontx2, PFs and VFs need to communicate with AF for allocating
>> > and freeing resources. Once all the configuration is done by AF for a
>> > PF/VF then packet I/O can happen on PF/VF queues. When an interface is
>> > brought up many mailbox messages are sent to AF for initializing
>> > queues. Say a VF is brought up then each message is sent to PF and PF
>> > forwards to AF and response also traverses from AF to PF and then VF.
>> > To aid debugging, tracepoints are added at places where messages are
>> > allocated, sent and message interrupts.
>> > Below is the trace of one of the messages from VF to AF and AF
>> > response back to VF:
>> 
>> Could you use the devlink tracepoint? trace_devlink_hwmsg() ?
>
>Thanks for the suggestion.
>In our case the mailbox is central to 3 different drivers and there would be a 4th one
>once crypto driver is accepted. We cannot add devlink to all of them inorder to use
>the devlink trace points.

I guess you have 1 pci device, right? Devlink instance is created per
pci device.


>
>Thanks,
>Sunil.