netdev - Re: [PATCH iproute2-net 2/3] devlink: Add pr_out

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Date:   Wed, 2 Dec 2020 09:00:37 +0200
From:   Moshe Shemesh <moshe@...dia.com>
To:     David Ahern <dsahern@...il.com>,
        Moshe Shemesh <moshe@...lanox.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...dia.com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2-net 2/3] devlink: Add pr_out_dev() helper
 function


On 11/29/2020 11:15 PM, David Ahern wrote:
> On 11/26/20 4:14 AM, Moshe Shemesh wrote:
>> diff --git a/devlink/devlink.c b/devlink/devlink.c
>> index a9ba0072..bd588869 100644
>> --- a/devlink/devlink.c
>> +++ b/devlink/devlink.c
>> @@ -2974,17 +2974,11 @@ static int cmd_dev_param(struct dl *dl)
>>   	pr_err("Command \"%s\" not found\n", dl_argv(dl));
>>   	return -ENOENT;
>>   }
>> -static int cmd_dev_show_cb(const struct nlmsghdr *nlh, void *data)
>> +
>> +static void pr_out_dev(struct dl *dl, struct nlattr **tb)
> why 'pr_out_dev'? there is no 'dev' argument.


Because it prints command dev show output, the data is in tb argument 
and includes bus name, dev name and dev stats.
>>   {
>> -	struct dl *dl = data;
>> -	struct nlattr *tb[DEVLINK_ATTR_MAX + 1] = {};
>> -	struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh);
>>   	uint8_t reload_failed = 0;
>>   
>> -	mnl_attr_parse(nlh, sizeof(*genl), attr_cb, tb);
>> -	if (!tb[DEVLINK_ATTR_BUS_NAME] || !tb[DEVLINK_ATTR_DEV_NAME])
>> -		return MNL_CB_ERROR;
>> -
>>   	if (tb[DEVLINK_ATTR_RELOAD_FAILED])
>>   		reload_failed = mnl_attr_get_u8(tb[DEVLINK_ATTR_RELOAD_FAILED]);
>>