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

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Date:	Wed, 24 Sep 2014 11:02:22 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	<netdev@...r.kernel.org>, <davem@...emloft.net>
Subject: Re: [ethtool PATCH 1/1] ethtool: Support cpsw ale-table registers
 in -d

On Monday 22 September 2014 04:28 AM, Ben Hutchings wrote:
> 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.

Will fis this in next version

> 
> [...]
>> +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.
> 

Will check the hardware version in v2.

Regards
Mugunthan V N
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