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

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Message-ID: <20151102195707.GC15009@oracle.com>
Date:	Mon, 2 Nov 2015 14:57:07 -0500
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	"Nelson, Shannon" <shannon.nelson@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
	sowmini.varadhan@...cle.com
Subject: Re: [PATCH v3 net] i40e: Look up MAC address in Open Firmware or
 IDPROM

On (11/02/15 17:26), Nelson, Shannon wrote:
> > I assume you mean .1q 
> 
> Yes, this is what I had in mind.

I dont think we're quite there yet, even without vlans.

If I turn on/off tcpdump, there's something about the way that the link
is bounced that leaves the device down while tcpdump is running. Then
after I exit tcpdump, it bounces things a few more times again, packets
flow for a brief interval, and then there's silence.

Seems like there's is a workq that results in
i40e_service_task->i40e_sync_vsi_filters that periodically resets things.

Doing 'ip link set eth0 promisc on' keeps things nice and steady.

How is this all supposed to work if I change the macaddr from /sbin/ip 
using i40e_set_mac() and then jiggle the promisc (either just the flag,
or with tcpdump)? (I cant tell because I dont have an x86 machine with 
i40e handy)

To frame the question differently, where all should I be invoking
the new i40e_macaddr_init() function from? 

--Sowmini

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