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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: "Min Hu (Connor)" <humin29@huawei.com>,
	dev@dpdk.org, bruce.richardson@intel.com,
	thomas.monjalon@6wind.com, lihuisong@huawei.com
Subject: Re: [dpdk-dev] [RFC V4] app/testpmd: fix queue stats mapping configuration
Date: Mon, 23 Nov 2020 09:51:59 +0000
Message-ID: <57e36a8a-f868-c449-2c43-347107b994d6@intel.com> (raw)
In-Reply-To: <20201120202928.126217ad@hermes.local>

On 11/21/2020 4:29 AM, Stephen Hemminger wrote:
> On Fri, 20 Nov 2020 23:33:40 +0000
> Ferruh Yigit <ferruh.yigit@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@intel.com> wrote:
>>>    
>>>> On 11/20/2020 11:50 AM, Min Hu (Connor) wrote:
>>>>> From: Huisong Li <lihuisong@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@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.

  parent reply	other threads:[~2020-11-23  9:52 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-20  8:26 [dpdk-dev] [RFC V2 0/2] fix queue stats mapping Min Hu (Connor)
2020-10-20  8:26 ` [dpdk-dev] [RFC V2 1/2] app/testpmd: fix queue stats mapping configuration Min Hu (Connor)
2020-10-30 20:54   ` Ferruh Yigit
2020-11-03  6:30     ` Min Hu (Connor)
2020-11-12  2:28       ` Min Hu (Connor)
2020-11-12  9:52         ` Ferruh Yigit
2020-11-18  3:39           ` Min Hu (Connor)
2020-11-20 11:50           ` [dpdk-dev] [RFC V4] " Min Hu (Connor)
2020-11-20 17:26             ` Ferruh Yigit
2020-11-20 23:21               ` Stephen Hemminger
2020-11-20 23:33                 ` Ferruh Yigit
2020-11-21  4:29                   ` Stephen Hemminger
2020-11-23  7:22                     ` Min Hu (Connor)
2020-11-23  9:51                     ` Ferruh Yigit [this message]
2020-11-30  8:29                       ` Min Hu (Connor)
2020-12-02 10:44                         ` Ferruh Yigit
2020-12-02 12:48                           ` [dpdk-dev] [PATCH V1] " Min Hu (Connor)
2020-12-08 15:48                             ` Ferruh Yigit
2020-12-07  1:28                           ` [dpdk-dev] [RFC V4] " Min Hu (Connor)
2020-10-20  8:26 ` [dpdk-dev] [RFC V2 2/2] app/testpmd: fix starting failed with queue-stats-mapping Min Hu (Connor)

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