linux-kernel - Re: [PATCH v3 net] i40e: Look up MAC address in Open Firmware or IDPROM

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Message-ID: <20151101162407.GA26373@oracle.com>
Date:	Sun, 1 Nov 2015 11:24:07 -0500
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	"Nelson, Shannon" <shannon.nelson@...el.com>
Cc:	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Vick, Matthew" <matthew.vick@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"Williams, Mitch A" <mitch.a.williams@...el.com>,
	"andy.shevchenko@...il.com" <andy.shevchenko@...il.com>
Subject: Re: [PATCH v3 net] i40e: Look up MAC address in Open Firmware or
 IDPROM

On (10/30/15 19:13), Sowmini Varadhan wrote:
> > In looking at a couple other drivers, I see the difference being that
> > they typically are writing the primary mac filter on probe (and any
> > other reset), whereas the i40e "knows" that the default mac address is
> > already set up as the filter and doesn't bother with a redundant write.
> > If you want to add this Open Filter code, you'll need to arrange for
> > this write to happen.  You can't call i40e_set_mac() to do it, but you
> > can see the i40e_aq_mac_address_write() code there that is involved in
> > updating the mac address as an example.  You probably will want to look
> > at section 4.2.1.5.3 of the XL710 data sheet in order to know how to
> > use i40e_aq_mac_address_write() for your situation.
>
> ok. I'll look into it (and also why this did not show up in my testing).

So I figured out why it all "seemed to work" - my test env had another
obscure init process that was marking the link promiscuous.  I guess
that was having the side-effect of somehow setting the filters above.

But looks like there's more to getting this right than just calling
i40e_aq_mac_address_write() - I think it also needs a i40e_aq_add_macvlan().  

I was able to get this to work by calling a the core part of
i40e_set_mac just before register_netdev. In my patch (RFC patch 
in a separate thread - please review) I now have this sequence in
i40e_probe

	err = i40e_get_platform_mac_addr(pdev, hw->mac.addr);
	if (err)
		i40e_get_mac_addr(hw, hw->mac.addr);
	 : 
	i40e_setup_pf_switch(..);

And the resulting i40e_vsi_setup() from i40e_setup_pf_switch()
will end up doing the right thing by invoking the guts of 
i40e_set_mac(), which is basically the  sequence:
	i40e_aq_mac_address_write()
	i40e_aq_add_macvlan()	

I dont know if it is necessary/possible/important to set up the
filters sooner in the sequence- the add_macvlan needs an "seid",
and I could not tell when (in the ":" code above) the right seid 
can be found.  

Please review the RFC patch I'll be sending shortly.

--Sowmini

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