[dpdk-dev] [PATCH 1/6] net/tap: use correct tap name

[Pascal Mazon]

On 02/01/2017 12:29 AM, Wiles, Keith wrote:
>
>> On Jan 31, 2017, at 10:39 AM, Pascal Mazon <pascal.mazon at 6wind.com> wrote:
>>
>> On 01/31/2017 05:06 PM, Wiles, Keith wrote:>
>>> Looking at the changes to set the link up/down and the adding the two functions. I noticed in the stop/start routines I was set the link in DPDK and not adjusting the interface link. Should the stop/start routine also do the same thing?
>>>
>>
>> Well, my patch is probably wrong.
>> The best option would probably be to set dev->data->dev_link.link_status
>> appropriately inside tap_link_set() only.
>>
>> I'm not sure it's compulsory to actually set the link UP in tap_dev_start()
>> (respectively DOWN in tap_dev_stop()).
>> If it is, however, it would be best done using tap_link_set() in those
>> functions.
>
> I was setting the link up/down in both places in the old code. The gotta is link up/down came later (I guess) and applications only call start/stop. In the other drivers like ring the like they tend to set link in start/stop and in link up/down, which is what I patterned my driver on.
>
> I looked around and the only applications calling link up/down was testpmd and ip_pipeline, but all of the apps call start/stop. Even the docs to not suggest that link up/down be used it appears start/stop must set the Link state and the developer can call link up/down APIs if needed for others reasons.
>
> I assume the link up/down only effects the link state and the start/stop is creating/destroying resources.
>
> My only solution I guess is to add the link up/down code to the start/stop API.

I'm not sure I understand your conclusion.
If the apps usually call start/stop only, then definitely those 
functions should set the link state appropriately.
To that effect, I think it best to just call tap_link_set() in 
tap_dev_start() (and similar for stopping).
Apps with just start/stop functions would get the expected behavior, and 
the tap PMD would also support setting the link up/down independently, 
for testpmd and ip_pipeline for example.

Does that sound fine?


>
>>
>> --
>> Pascal Mazon
>> www.6wind.com
>
> Regards,
> Keith
>


-- 
Pascal Mazon
www.6wind.com