[dpdk-stable] [dpdk-dev] net/i40e: add promiscuous configure unsupported check

[Ye Xiaolong]

On 03/03, Zhang, Xiao wrote:
>Hi Ferruh,
>
>> -----Original Message-----
>> From: Yigit, Ferruh
>> Sent: Monday, March 2, 2020 5:09 PM
>> To: Zhang, Xiao <xiao.zhang at intel.com>; dev at dpdk.org
>> Cc: Xing, Beilei <beilei.xing at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>;
>> stable at dpdk.org
>> Subject: Re: [dpdk-dev] net/i40e: add promiscuous configure unsupported check
>> 
>> On 2/28/2020 3:22 AM, Xiao Zhang wrote:
>> > Return ENOTSUP error code when configuring i40evf promiscuous mode to
>> > fix port start hang issue on platforms which are unsupported to
>> > configure promiscuous mode.
>> 
>> Hi Xiao,
>> 
>> What is the cause of the hang, was the application keep trying because of the "-
>> EAGAIN" error?
>
>When starting port, rte_eth_dev_start will call rte_eth_dev_config_restore in which promisc configure will be called to enable/disable promiscuous mode.
>Since "-EAGAIN" was returned if platforms not supported to configure promisc mode, it would return error and stop port starting.

So the real issue caused by this is "Fail to start port", not "hang", right?
I can change the description in the commit log directly.

Thanks,
Xiaolong