Re: [dpdk-dev] [RFC] some questions for speed_capa usage

[oulijun <oulijun@huawei.com>]

在 2021/1/18 19:23, Ferruh Yigit 写道:
> On 1/18/2021 10:27 AM, oulijun wrote:
>> Hi,
>>
>>
>> The 'speed_capa' will be reported in rte_eth_dev_info_get API. How 
>> should users use the field?
>>
>> 1) The driver reports only the capabilities supported by the NIC, and 
>> users only obtain the capabilities.
>> Maybe, there is a case that a rate bit in 'speed_capa' is not 
>> supported by the current transmission medium,
>> such as, copper cable optical modules and optical interface modules.
>>
>> 2) The field is used only to inform users of the speed_capa supported 
>> by the current transmission medium.
>> And users set the fixed speed or auto-negotiation by using 
>> 'link_speeds' according to the field.
>>
>> According to the existing implementations of all drivers, it seems 
>> that both of the above behaviors exist.
>>
>> How should we report and use it?
>>
> 
> Hi Lijun,
> 
> When the driver reports the capabilities supported by the NIC, we tend 
> to mark this feature as partially supported.
> 
> The expectation is the driver report the capability for the current 
> configuration, the PHY/FW/transmission medium, whatever it is.
> 
> Driver should return the current supported values so that application 
> can select one, as you said.
> 
Thank you for your answer. I see.
> Regards,
> ferruh
> .
>