Re: [PATCH net-next 3/8] devlink: report extended error message in region_read_dumpit

[Jacob Keller <jacob.e.keller@intel.com>]

On 11/18/2022 5:40 PM, Jakub Kicinski wrote:
> On Thu, 17 Nov 2022 14:07:58 -0800 Jacob Keller wrote:
>> Report extended error details in the devlink_nl_cmd_region_read_dumpit
>> function, by using the extack structure from the netlink_callback.
>>
>> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
>> ---
>>   net/core/devlink.c | 14 ++++++++++++--
>>   1 file changed, 12 insertions(+), 2 deletions(-)
>>
>> diff --git a/net/core/devlink.c b/net/core/devlink.c
>> index 932476956d7e..f2ee1da5283c 100644
>> --- a/net/core/devlink.c
>> +++ b/net/core/devlink.c
>> @@ -6453,8 +6453,14 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
>>   
>>   	devl_lock(devlink);
>>   
>> -	if (!attrs[DEVLINK_ATTR_REGION_NAME] ||
>> -	    !attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]) {
>> +	if (!attrs[DEVLINK_ATTR_REGION_NAME]) {
>> +		NL_SET_ERR_MSG_MOD(cb->extack, "No region name provided");
>> +		err = -EINVAL;
>> +		goto out_unlock;
>> +	}
>> +
>> +	if (!attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]) {
> 
> Please use GENL_REQ_ATTR_CHECK() instead of adding strings.
> 

Ahhh. Figured out why GENL_REQ_ATTR_CHECK wasn't used here already. It 
happens because the dumpit functions don't get a genl_info * struct, 
they get a netlink_cb and a genl_dumpit_info.

I can look at improving this.

Thanks,
Jake