netdev - Re: [patch net] sky2: fix rx filter setup on link up

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Message-ID: <20120918061339.GA2294@minipsycho.orion>
Date:	Tue, 18 Sep 2012 08:13:39 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, mlindner@...vell.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch net] sky2: fix rx filter setup on link up

Mon, Sep 17, 2012 at 11:15:07PM CEST, shemminger@...tta.com wrote:
>On Mon, 17 Sep 2012 22:47:24 +0200
>Jiri Pirko <jiri@...nulli.us> wrote:
>
>> Mon, Sep 17, 2012 at 06:12:14PM CEST, shemminger@...tta.com wrote:
>> >On Mon, 17 Sep 2012 17:10:17 +0200
>> >Jiri Pirko <jiri@...nulli.us> wrote:
>> >
>> >> In my case I have following problem. sky2_set_multicast() sets registers
>> >> GM_MC_ADDR_H[1-4] correctly to:
>> >> 0000 0800 0001 0410
>> >> However, when adapter gets link and sky2_link_up() is called, the values
>> >> are for some reason different:
>> >> 0000 0800 0016 0410
>> >
>> >Rather than papering over the problem, it would be better to
>> >trace back what is setting those registers and fix that code.
>> 
>> Yes, I did that. No code at sky2.[ch] is writing to this registers other
>> than sky2_set_multicast() and sky2_gmac_reset() (I hooked on sky2_write*()).
>> So I strongly believe this is a HW issue (maybe only issue of my revision
>> "Yukon-2 EC chip revision 2")
>> 
>> >
>> >> This in my case prevents iface to be able to receive packets with dst mac
>> >> 01:80:C2:00:00:02 (LACPDU dst mac), which I set up previously by
>> >> SIOCADDMULTI.
>> >> 
>> >> So remember computed rx_filter data and write it to GM_MC_ADDR_H[1-4] on
>> >> link_up.
>> >>
>> >
>> >Please do some more root cause analysis. Just save/restoring the
>> >registers is just a temporary workaround.
>
>Are you sure it isn't IPv6 or something else setting additional mulitcast
>addresses. You may need to instrument the set_multicast call.

I'm very sure that no code in sky2 is writing to GM_MC_ADDR_H[1-4] the
change I see in sky2_link_up(). When sky2_set_multicast() is called
again for any reason, the issue goes away and lacpdus are coming in.

I also experimentally used sky2_set_multicast() called from
sky2_link_up() and it helped as well.

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