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

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Date:   Tue, 15 Sep 2020 21:22:21 +0530
From:   sundeep subbaraya <sundeep.lkml@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "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

Hi Jiri,

On Mon, Sep 7, 2020 at 4:29 PM sundeep subbaraya <sundeep.lkml@...il.com> wrote:
>
> Hi Jakub,
>
> On Sat, Sep 5, 2020 at 2:07 AM Jakub Kicinski <kuba@...nel.org> wrote:
> >
> > On Fri, 4 Sep 2020 12:29:04 +0000 Sunil Kovvuri Goutham wrote:
> > > > >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.
> > > >
> > > > So you can still have per-pci device devlink instance and use the tracepoint
> > > > Jakub suggested.
> > > >
> > >
> > > Two things
> > > - As I mentioned above, there is a Crypto driver which uses the same mbox APIs
> > >   which is in the process of upstreaming. There also we would need trace points.
> > >   Not sure registering to devlink just for the sake of tracepoint is proper.
> > >
> > > - The devlink trace message is like this
> > >
> > >    TRACE_EVENT(devlink_hwmsg,
> > >      . . .
> > >         TP_printk("bus_name=%s dev_name=%s driver_name=%s incoming=%d type=%lu buf=0x[%*phD] len=%zu",
> > >                   __get_str(bus_name), __get_str(dev_name),
> > >                   __get_str(driver_name), __entry->incoming, __entry->type,
> > >                   (int) __entry->len, __get_dynamic_array(buf), __entry->len)
> > >    );
> > >
> > >    Whatever debug message we want as output doesn't fit into this.
> >
> > Make use of the standard devlink tracepoint wherever applicable, and you
> > can keep your extra ones if you want (as long as Jiri don't object).
>
> Sure and noted. I have tried to use devlink tracepoints and since it
> could not fit our purpose I used these.
>
Can you please comment.

> Thanks,
> Sundeep