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

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Message-ID: <BY5PR18MB3298EB53D2F869D64D7F534DC62D0@BY5PR18MB3298.namprd18.prod.outlook.com>
Date:   Fri, 4 Sep 2020 08:49:45 +0000
From:   Sunil Kovvuri Goutham <sgoutham@...vell.com>
To:     Jiri Pirko <jiri@...nulli.us>
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



> -----Original Message-----
> From: Jiri Pirko <jiri@...nulli.us>
> Sent: Friday, September 4, 2020 2:07 PM
> To: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> Cc: Jakub Kicinski <kuba@...nel.org>; sundeep.lkml@...il.com;
> davem@...emloft.net; 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.
> 

No, there are 3 drivers registering to 3 PCI device IDs and there can be many
instances of the same devices. So there can be 10's of instances of AF, PF and VFs.

Thanks,
Sunil.