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

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Date:   Fri, 4 Sep 2020 05:39:54 +0000
From:   Sunil Kovvuri Goutham <sgoutham@...vell.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "sundeep.lkml@...il.com" <sundeep.lkml@...il.com>
CC:     "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



> -----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.

Thanks,
Sunil.