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

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Date:   Mon, 21 Nov 2022 09:53:07 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH net-next 3/8] devlink: report extended error message in
 region_read_dumpit



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@...el.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.
> 

Wasn't aware of this, nice!

>> +		NL_SET_ERR_MSG_MOD(cb->extack, "No snapshot id provided");
>>   		err = -EINVAL;
>>   		goto out_unlock;
>>   	}
>> @@ -6477,6 +6483,8 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
>>   		region = devlink_region_get_by_name(devlink, region_name);
>>   
>>   	if (!region) {
>> +		NL_SET_ERR_MSG_MOD(cb->extack,
>> +				   "The requested region does not exist");
> 
> NL_SET_ERR_MSG_ATTR()

Yep, should have noticed that myself. Thanks.

> 
>>   		err = -EINVAL;
>>   		goto out_unlock;
>>   	}
>> @@ -6484,6 +6492,8 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
>>   	snapshot_id = nla_get_u32(attrs[DEVLINK_ATTR_REGION_SNAPSHOT_ID]);
>>   	snapshot = devlink_region_snapshot_get_by_id(region, snapshot_id);
>>   	if (!snapshot) {
>> +		NL_SET_ERR_MSG_MOD(cb->extack,
>> +				   "The requested snapshot id does not exist");
> 
> ditto
> 
>>   		err = -EINVAL;
>>   		goto out_unlock;
>>   	}
>