netdev - Re: [ethtool PATCH 1/1] ethtool: Support cpsw ale-table registers in -d

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Date:	Sun, 21 Sep 2014 23:58:46 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Mugunthan V N <mugunthanvnm@...com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [ethtool PATCH 1/1] ethtool: Support cpsw ale-table registers
 in -d

Sorry I didn't respond to this earlier.

On Wed, 2014-07-23 at 14:59 +0530, Mugunthan V N wrote:
[...]
> --- /dev/null
> +++ b/cpsw.c
[...]
> +static inline void cpsw_ale_set_field(u32 *ale_entry, u32 start, u32 bits,
> +				      u32 value)
> +{
> +	int idx;
> +
> +	value &= BITMASK(bits);
> +	idx    = start / 32;
> +	start -= idx * 32;
> +	idx    = 2 - idx; /* flip */
> +	ale_entry[idx] &= ~(BITMASK(bits) << start);
> +	ale_entry[idx] |=  (value << start);
> +}
> +
> +#define DEFINE_ALE_FIELD(name, start, bits)				\
> +static inline int cpsw_ale_get_##name(u32 *ale_entry)			\
> +{									\
> +	return cpsw_ale_get_field(ale_entry, start, bits);		\
> +}									\
> +static inline void cpsw_ale_set_##name(u32 *ale_entry, u32 value)	\
> +{									\
> +	cpsw_ale_set_field(ale_entry, start, bits, value);		\
> +}

The setter functions are unused.

[...]
> +int cpsw_dump_regs(struct ethtool_drvinfo *info, struct ethtool_regs *regs)
> +{
> +	u32 *reg = (u8 *)regs->data;
> +	u32 len = regs->len / 3;
> +	int i;
> +
> +	fprintf(stdout, "cpsw hw version %d.%d (%d)\n",
> +		CPSW_MAJOR_VERSION(regs->version),
> +		CPSW_MINOR_VERSION(regs->version),
> +		CPSW_RTL_VERSION(regs->version));
[...]

There needs to be a version check here.  Some future version of the
hardware or driver may introduce an incompatible dump format.

Ben.

-- 
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
                                                              - Albert Camus

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