linux-kernel - Re: [PATCH 2/2] net/ibm/emac: fix size of emac dump memory areas

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Date:	Thu, 14 May 2015 16:04:34 +0400
From:	Ivan Mikhaylov <ivan@...ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 2/2] net/ibm/emac: fix size of emac dump memory areas

On Tue, 12 May 2015 17:12:00 +0400
Ivan Mikhaylov <ivan@...ibm.com> wrote:
>>On Tue, 2015-05-12 at 17:12 +0400, Ivan Mikhaylov wrote:
>> Fix in send of emac regs dump to ethtool which
>> causing wrong data interpretation on ethtool
>> layer for MII and EMAC.
>
>Please provide a better explanation. You removed the difference
>in register space size between EMAC and EMAC4, why ? You also changed a
>test regarding which version of the structure to use from EMAC4 to
>EMAC4SYNC, why ?

So, as I understand right, we have EMAC, EMAC4, EMAC4SYNC chips right now?
But within driver structure there are only EMAC4/EMAC4SYNC that I'm seeing or 
is it include and EMAC? I thought that only EMAC4/EMAC4SYNC we have. 

Anyway we have bug in ethtool, there size of emac_regs is defined and if we
will provide wrong size of emac_regs structure that will cause problems in
showing of some emac_regs fields for emac4sync + MII layer. Plus size of 
register space can be different on different platforms so because of this 
I removed macroses which doing this right from it. So just for example 
we have 0x100 for emac4sync in dts file, sizeof on ethtool is 152 always for 
emac_regs and we're reading MII values from emac area where is no data for
MII.

I have to add emac4sync support to ethtool regdump as I see in plus to
EMAC/EMAC4. What your opinion on this?

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