netdev - Re: [PATCH ethtool] Ethtool: Add Altera Triple Speed Ethernet Support

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Date:	Tue, 27 May 2014 21:09:57 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Vince Bridgers <vbridgers2013@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH ethtool] Ethtool: Add Altera Triple Speed Ethernet
 Support

On Thu, 2014-05-08 at 13:15 -0500, Vince Bridgers wrote:
> This patch adds Altera Triple Speed Ethernet support for dumping
> formatted register output from Ethtool.

Sorry for the slow response

[...]
> --- /dev/null
> +++ b/tse.c
[...]
> +int altera_tse_dump_regs(struct ethtool_drvinfo *info,
> +			 struct ethtool_regs *regs)
> +{
> +	int i;
> +	u32 *tsereg = (unsigned int *)regs->data;
> +	u32 version = regs->version;
> +
> +	/*
> +	 * Version 1: Initial TSE driver release. No feature information
> +	 *	      available, 32-bits of version is equal to 1.
> +	 *
> +	 * Version 2: Lower 16-bits of version is 2, upper 16 bits are:
> +	 *	Bit 16 - SGMDA or MSGDMA Registers
> +	 *	Bit 17 - PCS Present
> +	 *	Bit 18 - Supplementary MAC Address Filter Registers Present
> +	 *	Bit 19 - Multicast Hash Filter Present
> +	 *	Bit 20 - IEEE 1588 Feature Present
> +	 */
[...]

You need to check that you recognise the version and bail out if not.
Otherwise, this is likely to do something silly when the driver supports
a new hardware revision.

Ben.

-- 
Ben Hutchings
A free society is one where it is safe to be unpopular. - Adlai Stevenson

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