[dpdk-dev] [RFC V4] app/testpmd: fix queue stats mapping configuration
Min Hu (Connor)
humin29 at huawei.com
Mon Nov 30 09:29:33 CET 2020
Hi, Ferruh, and all,
are there any comments about this set of patch?
在 2020/11/23 17:51, Ferruh Yigit 写道:
> On 11/21/2020 4:29 AM, Stephen Hemminger wrote:
>> On Fri, 20 Nov 2020 23:33:40 +0000
>> Ferruh Yigit <ferruh.yigit at intel.com> wrote:
>>
>>> On 11/20/2020 11:21 PM, Stephen Hemminger wrote:
>>>> On Fri, 20 Nov 2020 17:26:55 +0000
>>>> Ferruh Yigit <ferruh.yigit at intel.com> wrote:
>>>>> On 11/20/2020 11:50 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) The configuration result does not take effect or can not be
>>>>>> queried
>>>>>> in real time.
>>>>>> 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) These record structures,
>>>>>> 'map_port_queue_stats_mapping_registers()'
>>>>>> and its sub functions are redundant for majority of drivers.
>>>>>> 6) The display of the queue stats and queue stats mapping is mixed
>>>>>> together.
>>>>>>
>>>>>> Since xstats is used to obtain queue statistics, we have made the
>>>>>> following
>>>>>> simplifications and adjustments:
>>>>>> 1) If PMD requires and supports queue stats mapping, configure to
>>>>>> driver in
>>>>>> real time by calling ethdev API after executing the command
>>>>>> "set stat_qmap rx/tx ...". If not, the command can not be
>>>>>> accepted.
>>>>>> 2) Based on the above adjustments, these record structures,
>>>>>> 'map_port_queue_stats_mapping_registers()' and its sub functions
>>>>>> can be
>>>>>> removed. "tx-queue-stats-mapping" & "rx-queue-stats-mapping"
>>>>>> parameters,
>>>>>> and 'parse_queue_stats_mapping_config()' can be removed too.
>>>>>> 3) remove display of queue stats mapping in 'fwd_stats_display()' &
>>>>>> 'nic_stats_display()', and obtain queue stats by xstats.
>>>>>> Since the record structures are removed,
>>>>>> 'nic_stats_mapping_display()'
>>>>>> can be deleted.
>>>>>>
>>>>>> 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>
>>>>>
>>>>> Overall looks good to me.
>>>>> I did a quick test didn't see anything unexpected. 'xstats' or
>>>>> 'dpdk-proc-info'
>>>>> app still can be used to get queue stats and "set stat_qmap ..." is
>>>>> working as
>>>>> expected.
>>>>>
>>>>> But it is a little late for this release cycle, would you be OK to
>>>>> get this at
>>>>> the beginning of next release?
>>>>
>>>> Could we plan to deprecate queue stats mapping in future when xstats
>>>> work is done?
>>>
>>> Even queue stats moved to xstats, a few PMDs still need this
>>> configuration and API.
>>> And this patch already cleans the queue stats mapping noise from
>>> testpmd.
>>>
>>> What is the benefit/motivation to deprecate the queue stats mapping API?
>>
>> Mostly because so few drivers implement it, that any application using it
>> is going to be non-portable.
>>
>
> 'rte_eth_dev_set_.*_queue_stats_mapping()' APIs return '-ENOTSUP' if
> underlying PMD doesn't support it, applications can check this for
> portable code.
> .
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