[dpdk-stable] [PATCH] net/fm10k: initialize sm_down variable

[Meunier, Julien (Nokia - FR/Paris-Saclay)]

Hi,

Inline reply,

On 04/01/2019 18:34, Ferruh Yigit wrote:
> On 1/4/2019 1:04 PM, Zhang, Qi Z wrote:
>>
>>
>>> -----Original Message-----
>>> From: Wang, Xiao W
>>> Sent: Thursday, January 3, 2019 10:10 AM
>>> To: Julien Meunier <julien.meunier at nokia.com>; Zhang, Qi Z
>>> <qi.z.zhang at intel.com>
>>> Cc: dev at dpdk.org; stable at dpdk.org
>>> Subject: RE: [PATCH] net/fm10k: initialize sm_down variable
>>>
>>> Hi Julien,
>>>
>>>> -----Original Message-----
>>>> From: Julien Meunier [mailto:julien.meunier at nokia.com]
>>>> Sent: Wednesday, January 2, 2019 11:58 PM
>>>> To: Zhang, Qi Z <qi.z.zhang at intel.com>; Wang, Xiao W
>>>> <xiao.w.wang at intel.com>
>>>> Cc: dev at dpdk.org; stable at dpdk.org
>>>> Subject: [PATCH] net/fm10k: initialize sm_down variable
>>>>
>>>> Fixes: 6f22f2f67268 ("net/fm10k: redefine link status semantics")
>>>> Cc: stable at dpdk.org
>>>>
>>>> Signed-off-by: Julien Meunier <julien.meunier at nokia.com>
>>>> ---
>>>>   drivers/net/fm10k/fm10k_ethdev.c | 1 +
>>>>   1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/net/fm10k/fm10k_ethdev.c
>>>> b/drivers/net/fm10k/fm10k_ethdev.c
>>>> index 85fb6c5..caf4d1b 100644
>>>> --- a/drivers/net/fm10k/fm10k_ethdev.c
>>>> +++ b/drivers/net/fm10k/fm10k_ethdev.c
>>>> @@ -3003,6 +3003,7 @@ fm10k_params_init(struct rte_eth_dev *dev)
>>>>   	hw->bus.payload = fm10k_bus_payload_256;
>>>>
>>>>   	info->rx_vec_allowed = true;
>>>> +	info->sm_down = false;
>>>>   }
>>>>
>>>>   static int
>>>> --
>>>> 2.10.2
>>>
>>> Acked-by: Xiao Wang <xiao.w.wang at intel.com>
>>
>> Applied to dpdk-next-net-intel.
> 
> Is it possible to add more information to commit log?

Sure, no problem.

> What happens if "sm_down" is not initialized? What "sm_down" is for?

sm_down is a boolean in order to check if the internal switch of the 
fm10k is up or down. This variable is configured though an interrupt by 
fm10k_dev_interrupt_handler_pf.

If sm_down is uninitialized, we are not sure of its value at the first 
bring up. For example, if FM10K_EICR_SWITCHREADY is raised, the PMD will 
try to reconfigure the switch, but it does not make sense, as it's the 
first startup.

The sm_down implementation has been introduced here: 6c9f37245583 
("net/fm10k: support switch restart on PF").

> Should patch title be a 'fix' patch?
> 

Mmm, I think yes.

However, my patch has been already merged. Should I need to repush an 
other patch for the stable branches ?

Thanks,
Best regards,
Julien Meunier