netdev - Re: [patch net-next v4 4/4] igb/igbvf: implement ndo_get_phys_port

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Date:	Thu, 25 Jul 2013 19:51:06 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
CC:	Jiri Pirko <jiri@...nulli.us>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, <stephen@...workplumber.org>,
	<Narendra_K@...l.com>, <john.r.fastabend@...el.com>,
	<or.gerlitz@...il.com>, <jeffrey.t.kirsher@...el.com>,
	<jesse.brandeburg@...el.com>, <bruce.w.allan@...el.com>,
	<carolyn.wyborny@...el.com>, <donald.c.skidmore@...el.com>,
	<gregory.v.rose@...el.com>, <peter.p.waskiewicz.jr@...el.com>,
	<john.ronciak@...el.com>, <tushar.n.dave@...el.com>,
	<matthew.vick@...el.com>, <mitch.a.williams@...el.com>,
	<vyasevic@...hat.com>, <amwang@...hat.com>,
	<johannes@...solutions.net>
Subject: Re: [patch net-next v4 4/4] igb/igbvf: implement
 ndo_get_phys_port_id

On Thu, 2013-07-25 at 11:00 -0700, Alexander Duyck wrote:
> On 07/25/2013 09:44 AM, Ben Hutchings wrote:
> > On Thu, 2013-07-25 at 09:17 -0700, Alexander Duyck wrote:
> >> On 07/25/2013 06:03 AM, Jiri Pirko wrote:
> >>> @@ -1982,6 +2001,21 @@ static s32 igb_init_i2c(struct igb_adapter *adapter)
> >>>  	return status;
> >>>  }
> >>>  
> >>> +static void igb_compute_phys_port_id(struct igb_adapter *adapter)
> >>> +{
> >>> +	adapter->phys_port_id = *((u32 *) adapter->netdev->dev_addr);
> >>> +	adapter->phys_port_id ^= *((u32 *) adapter->netdev->dev_addr + 4);
> >>> +	adapter->phys_port_id ^= (long) adapter;
> >>> +	adapter->phys_port_id ^= (long) adapter->hw.hw_addr;
> >>> +	adapter->phys_port_id ^= (long) adapter->hw.flash_address;
> >>> +	adapter->phys_port_id ^= (u32) adapter->hw.io_base;
> >>> +	adapter->phys_port_id ^= adapter->hw.device_id;
> >>> +	adapter->phys_port_id ^= adapter->hw.subsystem_vendor_id;
> >>> +	adapter->phys_port_id ^= adapter->hw.subsystem_device_id;
> >>> +	adapter->phys_port_id ^= adapter->hw.vendor_id;
> >>> +	adapter->phys_port_id ^= adapter->hw.revision_id;
> > I didn't look at Jiri's patch initially, but... what's wrong with using
> > the MAC address from NVRAM (should already be in netdev->perm_addr)?
> > That's what I'm expecting to do for the SFC9000 family in sfc.
> >
> >>> +}
> >>> +
> >>>  /**
> >>>   *  igb_probe - Device Initialization Routine
> >>>   *  @pdev: PCI device information struct
> >> I really think this bit here should be standardized and made available
> >> to all drivers.
> > [...]
> >
> > I think it's a bad example and should not be used in any drivers!
> >
> > Ben.
> >
> 
> I agree.  That is why the second paragraph started listing what was
> wrong with this implementation.  What I said was meant in the more
> general sense that whatever solution should be used should be the same
> across multiple drivers, not up to each driver to compute.

I would love to know how you think this can be done generically.  If it
can then we don't need the driver operation at all.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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