netdev - Re: [patch net-next 2/2] mlxsw: spectrum: Add support for access cable info via ethtool

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Date:   Thu, 27 Jul 2017 11:28:26 +0300
From:   Arkadi Sharshevsky <arkadis@...lanox.com>
To:     Andrew Lunn <andrew@...n.ch>, Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
        mlxsw@...lanox.com
Subject: Re: [patch net-next 2/2] mlxsw: spectrum: Add support for access
 cable info via ethtool



On 07/26/2017 05:18 PM, Andrew Lunn wrote:
>> +static int mlxsw_sp_get_module_info(struct net_device *netdev,
>> +				    struct ethtool_modinfo *modinfo)
>> +{
>> +	struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(netdev);
>> +	u8 module_info[MLXSW_SP_EEPROM_MODULE_INFO_SIZE];
>> +	u8 module_rev_id, module_id;
>> +	unsigned int read_size;
>> +	int err;
>> +
>> +	err = mlxsw_sp_query_module_eeprom(mlxsw_sp_port, 0,
>> +					   MLXSW_SP_EEPROM_MODULE_INFO_SIZE,
>> +					   module_info, &read_size);
>> +	if (err)
>> +		return err;
>> +
>> +	if (read_size < MLXSW_SP_EEPROM_MODULE_INFO_SIZE)
>> +		return -EIO;
>> +
>> +	module_rev_id = module_info[MLXSW_SP_EEPROM_MODULE_INFO_REV_ID];
>> +	module_id = module_info[MLXSW_SP_EEPROM_MODULE_INFO_ID];
>> +
>> +	switch (module_id) {
>> +	case MLXSW_SP_EEPROM_MODULE_INFO_ID_QSFP:
>> +		modinfo->type       = ETH_MODULE_SFF_8436;
>> +		modinfo->eeprom_len = ETH_MODULE_SFF_8436_LEN;
>> +		break;
>> +	case MLXSW_SP_EEPROM_MODULE_INFO_ID_QSFP_PLUS:
>> +	case MLXSW_SP_EEPROM_MODULE_INFO_ID_QSFP28:
>> +		if (module_id  == MLXSW_SP_EEPROM_MODULE_INFO_ID_QSFP28 ||
>> +		    module_rev_id >= MLXSW_SP_EEPROM_MODULE_INFO_REV_ID_8636) {
>> +			modinfo->type       = ETH_MODULE_SFF_8636;
>> +			modinfo->eeprom_len = ETH_MODULE_SFF_8636_LEN;
>> +		} else {
>> +			modinfo->type       = ETH_MODULE_SFF_8436;
>> +			modinfo->eeprom_len = ETH_MODULE_SFF_8436_LEN;
>> +		}
>> +		break;
>> +	case MLXSW_SP_EEPROM_MODULE_INFO_ID_SFP:
>> +		modinfo->type       = ETH_MODULE_SFF_8472;
>> +		modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
>> +		break;
>> +	default:
>> +		return -EINVAL;
> 
> Hi Jiri
> 
> I remember seeing a few different implementations of this function in
> various drivers. Could you pull it out into a helper, passing in the
> array of bytes and mod info? bnxt, mlx4, mlx5, igb, ixgbe and sfc
> could then use the helper.
> 
>       Andrew
> 

Yeah, it seems generic for all modules, it can be moved into ethtool
I think.

Thanks,
Arkadi