[dpdk-dev] [RFC V2 1/2] app/testpmd: fix queue stats mapping configuration

[Min Hu (Connor)]

HI， Ferruh,
	Ok，I will send V3 patches. thanks.

在 2020/11/12 17:52, Ferruh Yigit 写道:
> On 11/12/2020 2:28 AM, Min Hu (Connor) wrote:
>> Hi Ferruh, any suggestions?
>>
>>
>> 在 2020/11/3 14:30, Min Hu (Connor) 写道:
>>> Hi Ferruh,
>>>
>>> I agree with your proposal. But if we remove record structures, we will
>>> not be able to query the current queue stats mapping configuration. Or
>>> we can provide a query API for the PMD driver that uses the
>>> set_queue_stats_mapping API, and driver records these mapping
>>> information from user.
>>>
>>> What do you think?
>>>
> 
> Sorry for delay,
> 
> Yes that information will be lost, but since the queue stats mapping is 
> not commonly used, I think it can be OK to loose it.
> 
> As you said another option is to add a new ethdev API to get queue stats 
> mapping, but because of same reason not sure about adding it. We can add 
> it later if there is a request for it.
> 
>>>
>>> 在 2020/10/31 4:54, Ferruh Yigit 写道:
>>>> On 10/20/2020 9:26 AM, Min Hu (Connor) wrote:
>>>>> From: Huisong Li <lihuisong at huawei.com>
>>>>>
>>>>> Currently, the queue stats mapping has the following problems:
>>>>> 1) Many PMD drivers don't support queue stats mapping. But there is no
>>>>> failure message after executing the command "set stat_qmap rx 0 2 2".
>>>>> 2) Once queue mapping is set, unrelated and unmapped queues are also
>>>>> displayed.
>>>>> 3) There is no need to keep cache line alignment for
>>>>> 'struct queue_stats_mappings'.
>>>>> 4) The mapping arrays, 'tx_queue_stats_mappings_array' &
>>>>> 'rx_queue_stats_mappings_array' are global and their sizes are 
>>>>> based on
>>>>> fixed max port and queue size assumptions.
>>>>> 5) The configuration result does not take effect or can not be queried
>>>>> in real time.
>>>>>
>>>>> Therefore, we have made the following adjustments:
>>>>> 1) If PMD supports queue stats mapping, configure to driver in real 
>>>>> time
>>>>> after executing the command "set stat_qmap rx/tx ...". If not,
>>>>> the command can not be accepted.
>>>>> 2) Only display queues that mapping done by adding a new 'active' 
>>>>> field
>>>>>   in queue_stats_mappings struct.
>>>>> 3) Remove cache alignment for 'struct queue_stats_mappings'.
>>>>> 4) Add a new port_stats_mappings struct in rte_port.
>>>>> The struct contains number of rx/txq stats mapping, rx/tx
>>>>> queue_stats_mapping_enabled flag, and rx/tx queue_stats_mapping array.
>>>>> Size of queue_stats_mapping_array is set to 
>>>>> "RTE_ETHDEV_QUEUE_STAT_CNTRS"
>>>>>   to ensure that the same number of queues can be set for each port.
>>>>>
>>>>
>>>> Hi Connor,
>>>>
>>>> I think above adjustment are good, but after the decision to use 
>>>> xstats for the queue stats, what do you think about more 
>>>> simplification,
>>>>
>>>> 1)
>>>> What testpmd does is, records the queue stats mapping commands and 
>>>> registers them later on port start & forwarding start.
>>>> What happens if recording and registering completely removed?
>>>> When "set stat_qmap .." issued, it just call the ethdev APIs to do 
>>>> the mapping in device.
>>>> This lets us removing record structures, "struct port_stats_mappings 
>>>> p_stats_map"
>>>> Also can remove 'map_port_queue_stats_mapping_registers()' and its 
>>>> sub functions.
>>>>
>>>> 2)
>>>> Also lets remove "tx-queue-stats-mapping" & "rx-queue-stats-mapping" 
>>>> parameters, which enables removing 
>>>> 'parse_queue_stats_mapping_config()' function too
>>>>
>>>> 3)
>>>> Another problem is to display the queue stats, in 
>>>> 'fwd_stats_display()' & 'nic_stats_display()', there is a check if 
>>>> the queue stats mapping enable or not 
>>>> ('rx_queue_stats_mapping_enabled' & 'tx_queue_stats_mapping_enabled'),
>>>> I think displaying queue stats and queue stat mapping should be 
>>>> separate, why not drop checks for queue stats mapping and display 
>>>> queue stats for 'nb_rxq' & 'nb_txq' queues?
>>>>
>>>> Does above make sense?
>>>>
>>>>
>>>> Majority of the drivers doesn't require queue stat mapping to get 
>>>> the queue stats, lets don't pollute main usage with this requirement.
>>>>
>>>>
>>>>> Fixes: 4dccdc789bf4b ("app/testpmd: simplify handling of stats 
>>>>> mappings error")
>>>>> Fixes: 013af9b6b64f6 ("app/testpmd: various updates")
>>>>> Fixes: ed30d9b691b21 ("app/testpmd: add stats per queue")
>>>>>
>>>>> Signed-off-by: Huisong Li <lihuisong at huawei.com>
>>>>
>>>> <...>
>>>>
>>>> .
> 
> .