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

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Message-ID: <20120917091214.5cd9b0f5@nehalam.linuxnetplumber.net>
Date:	Mon, 17 Sep 2012 09:12:14 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jiri Pirko <jiri@...nulli.us>
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

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.

> 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.
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