netdev - Re: [net-next 11/15] i40e: Implement debug macro hw_dbg using pr

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Date:   Mon, 2 Sep 2019 14:24:33 -0300
From:   Mauro Rodrigues <maurosr@...ux.vnet.ibm.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next 11/15] i40e: Implement debug macro hw_dbg using
 pr_debug

On Wed, Aug 28, 2019 at 03:39:53PM -0700, Jakub Kicinski wrote:
> On Tue, 27 Aug 2019 23:44:03 -0700, Jeff Kirsher wrote:
> > diff --git a/drivers/net/ethernet/intel/i40e/i40e_osdep.h b/drivers/net/ethernet/intel/i40e/i40e_osdep.h
> > index a07574bff550..c0c9ce3eab23 100644
> > --- a/drivers/net/ethernet/intel/i40e/i40e_osdep.h
> > +++ b/drivers/net/ethernet/intel/i40e/i40e_osdep.h
> > @@ -18,7 +18,12 @@
> >   * actual OS primitives
> >   */
> >  
> > -#define hw_dbg(hw, S, A...)	do {} while (0)
> > +#define hw_dbg(hw, S, A...)							\
> > +do {										\
> > +	int domain = pci_domain_nr(((struct i40e_pf *)(hw)->back)->pdev->bus);	\
> > +	pr_debug("i40e %04x:%02x:%02x.%x " S, domain, (hw)->bus.bus_id,		\
> > +		 (hw)->bus.device, (hw)->bus.func, ## A);			\
> 
> This looks like open coded dev_dbg() / dev_namie(), why?

Indeed, thanks for pointing out. I'll fix this and the other patch you
reviewed and resubmit.

I'm not sure what should be the preferred approach here though, just use
dev_dbg to implement this macro or replace all of its occurrence in the
code by dev_dbg?

Jeff, do you have any preference?
> 
> > +} while (0)