> +static int eeprom_prepare_data(const struct ethnl_req_info *req_base,
> + struct ethnl_reply_data *reply_base,
> + struct genl_info *info)
> +{
> + struct eeprom_reply_data *reply = MODULE_EEPROM_REPDATA(reply_base);
> + struct eeprom_req_info *request = MODULE_EEPROM_REQINFO(req_base);
> + struct ethtool_module_eeprom page_data = {0};
> + struct net_device *dev = reply_base->dev;
> + int ret;
> +
> + if (!dev->ethtool_ops->get_module_eeprom_by_page)
> + return -EOPNOTSUPP;
> +
> + /* Allow dumps either of low or high page without crossing half page
> boundary */
> + if ((request->offset < ETH_MODULE_EEPROM_PAGE_LEN / 2 &&
> + request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN /
> 2) ||
> + request->offset + request->length > ETH_MODULE_EEPROM_PAGE_LEN)
> + return -EINVAL;
Please keep all the parameter validation together, in
eeprom_parse_request(). At some point, we may extend
eeprom_parse_request() to make use of extack, to indicate which
parameter is invalid. Just getting an -EINVAL can be hard to debug,
where as NL_SET_ERR_MSG_ATTR() can help the user.
Andrew
