netdev - Re: [PATCH v2 net] devlink: Fix error handling in param and info

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Date:   Mon, 30 Sep 2019 15:34:00 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        jiri@...lanox.com, davem@...emloft.net, netdev@...r.kernel.org,
        Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH v2 net] devlink: Fix error handling in param and info_get
 dumpit cb

Mon, Sep 30, 2019 at 02:10:03PM CEST, andrew@...n.ch wrote:
>On Mon, Sep 30, 2019 at 11:52:21AM +0530, Vasundhara Volam wrote:
>> If any of the param or info_get op returns error, dumpit cb is
>> skipping to dump remaining params or info_get ops for all the
>> drivers.
>> 
>> Fix to not return if any of the param/info_get op returns error
>> as not supported and continue to dump remaining information.
>> 
>> v2: Modify the patch to return error, except for params/info_get
>> op that return -EOPNOTSUPP as suggested by Andrew Lunn. Also, modify
>> commit message to reflect the same.
>> 
>> Cc: Andrew Lunn <andrew@...n.ch>
>> Cc: Jiri Pirko <jiri@...lanox.com>
>> Cc: Michael Chan <michael.chan@...adcom.com>
>> Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
>> ---
>>  net/core/devlink.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>> 
>> diff --git a/net/core/devlink.c b/net/core/devlink.c
>> index e48680e..f80151e 100644
>> --- a/net/core/devlink.c
>> +++ b/net/core/devlink.c
>> @@ -3172,7 +3172,7 @@ static int devlink_nl_cmd_param_get_dumpit(struct sk_buff *msg,
>>  						    NETLINK_CB(cb->skb).portid,
>>  						    cb->nlh->nlmsg_seq,
>>  						    NLM_F_MULTI);
>> -			if (err) {
>> +			if (err && err != -EOPNOTSUPP) {
>>  				mutex_unlock(&devlink->lock);
>>  				goto out;
>>  			}
>
>and out: is
>
>out:
>        mutex_unlock(&devlink_mutex);
>
>        cb->args[0] = idx;
>        return msg->len;
>}
>
>Jiri: Is the intention really to throw away the error?
>
>Looking at the rest of devlink, all the other _get_dumpit() functions,
>except health_reporter_dump_get_dumpit(), do discard any errors.

You are correct. The -EMSGSIZE dump errors should not be propagaged out
and -EOPNOTSUPP, but the rest should. I'll look into it.

Thanks!


>
>As for this patch
>
>Reviewed-by: Andrew Lunn <andrew@...n.ch>
>
>    Andrew