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:

quoted

+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