netdev - Re: [PATCH] ethtool: changes of emac_regs structure accordingly within driver emac

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Date:	Sun, 31 May 2015 21:57:27 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Ivan Mikhaylov <ivan@...ibm.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] ethtool: changes of emac_regs structure accordingly
 within driver emac_regs structure.

On Thu, 2015-05-21 at 19:09 +0400, Ivan Mikhaylov wrote:
> In ibm_emac.c in ethtool size of emac structure which passing through to driver
> is nailed down and not correlating with current emac_regs structure.
> 
> Signed-off-by: Ivan Mikhaylov <ivan@...ibm.com>
[...]

This is not backward-compatible.  It ought to be possible to mix and
match old and new ethtool and driver, except for the EMAC4SYNC case
which has been broken up until now.

Using the new definition of struct emac_regs, I think the driver and
ethtool need to agree that the MAC register dump sizes are:

EMAC:      offsetof(struct emac_regs, u1)
EMAC4:     offsetof(struct emac_regs, u1.emac4) + sizeof(p->u1.emac4)
EMAC4SYNC: offsetof(struct emac_regs, u1.emac4sync) + sizeof(p->u1.emac4sync)

Ben.

-- 
Ben Hutchings
Reality is just a crutch for people who can't handle science fiction.

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