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From: fengchengwen <fengchengwen@huawei.com>
To: Morten Brørup <mb@smartsharesystems.com>,
	Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	Stephen Hemminger <stephen@networkplumber.org>
Cc: <thomas@monjalon.net>, <ferruh.yigit@xilinx.com>,
	<ndabilpuram@marvell.com>, <kirankumark@marvell.com>,
	<skori@marvell.com>, <skoteshwar@marvell.com>, <dev@dpdk.org>
Subject: Re: [PATCH 1/3] ethdev: fix telemetry xstats return null with some PMDs
Date: Thu, 28 Apr 2022 21:38:50 +0800
Message-ID: <4aeb8f6a-0537-2f14-240c-bddc74977b7e@huawei.com> (raw)
In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35D86FF7@smartserver.smartshare.dk>

On 2022/4/25 18:16, Morten Brørup wrote:
>> From: fengchengwen [mailto:fengchengwen@huawei.com]
>> Sent: Sunday, 24 April 2022 05.45
>>
>> The root cause is: when the xstats is NULL and n less than required
>> number of
>> elements is zero, the return value of rte_eth_xstats_get is ambiguous
>> from
>> rte_ethdev.h's declaration.
>>
>> But the implementation of rte_eth_xstats_get return required number of
>> elements
>> when xstats is NULL and n less than required number of elements.
>>
>> There are two modification schemes:
>> a) the value of xstats cannot be NULL, and the value of n must be
>> greater than
>>    or equal to the required number, otherwise, an error code is
>> returned.
>> b) define the behavior as the same as rte_eth_xstats_get_names, which
>> means return
>>    required number of elelement when xstats is NULL and n less than
>> required number
>>    of elements.
>>
>> I prefer the scheme a because rte_eth_xstats_get and
>> rte_eth_xstats_get_name are
>> symbiotic, and it's not necessary to both implement the same logic.
>>
>> Also for scheme a, there is no need to modify the PMD implementation.
>>
>> What about your opinions ?
> 
> This is an excellent proposal.
> 
> And if the documentation for rte_eth_xstats_get() refers to rte_eth_xstats_get_names() for getting the number of elements, it is perfect.

Hi Morten,

   I did a deepin review and found that many application use rte_eth_xstats_get(port_id, NULL, 0),
and also many PMD already support return required number of entries when xstats is NULL. So in
the v2, I use the modified hns3/ipn3ke/mvpp2/axgbe PMD method and explicit return value when xstats
is NULL of rte_eth_xstats-get().

Thanks.

> 
>>
>> On 2022/4/21 14:49, Andrew Rybchenko wrote:
>>> On 4/16/22 04:38, Stephen Hemminger wrote:
>>>> On Sat, 16 Apr 2022 09:07:45 +0800
>>>> Chengwen Feng <fengchengwen@huawei.com> wrote:
>>>>
>>>>> Currently the telemetry xstats uses rte_eth_xstats_get() to
>> retrieve
>>>>> the number of elements. But the value to be returned when the
>> parameter
>>>>> 'xstats' is NULL is not specified, some PMDs (eg.
>> hns3/ipn3ke/mvpp2/
>>>>> axgbe) return zero while others return the required number of
>> elements.
>>>>
>>>> Lets fix the PMD's this impacts other code as well.
>>>
>>> +1
>>>
>>> .
>>
> 


  reply	other threads:[~2022-04-28 13:38 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-16  1:07 [PATCH 0/3] bugfix for ethdev telemetry Chengwen Feng
2022-04-16  1:07 ` [PATCH 1/3] ethdev: fix telemetry xstats return null with some PMDs Chengwen Feng
2022-04-16  1:38   ` Stephen Hemminger
2022-04-21  6:49     ` Andrew Rybchenko
2022-04-24  3:44       ` fengchengwen
2022-04-25 10:16         ` Morten Brørup
2022-04-28 13:38           ` fengchengwen [this message]
2022-04-28 13:53             ` Morten Brørup
2022-04-16  1:07 ` [PATCH 2/3] ethdev: fix memory leak when telemetry xstats Chengwen Feng
2022-04-21  6:51   ` Andrew Rybchenko
2022-04-21  8:09   ` David Marchand
2022-04-21  9:03     ` Bruce Richardson
2022-04-22  8:14       ` David Marchand
2022-04-16  1:07 ` [PATCH 3/3] net/cnxk: fix telemetry possible null pointer access Chengwen Feng
2022-04-28 13:15 ` [PATCH v2 0/9] bugfix for ethdev telemetry Chengwen Feng
2022-04-28 13:15   ` [PATCH v2 1/9] ethdev: define retval when xstats is null of get xstats Chengwen Feng
2022-05-04 10:32     ` Andrew Rybchenko
2022-04-28 13:15   ` [PATCH v2 2/9] net/hns3: adjust " Chengwen Feng
2022-05-06  7:56     ` Min Hu (Connor)
2022-04-28 13:15   ` [PATCH v2 3/9] net/ipn3ke: " Chengwen Feng
2022-04-28 13:15   ` [PATCH v2 4/9] net/mvpp2: " Chengwen Feng
2022-04-28 13:15   ` [PATCH v2 5/9] net/axgbe: " Chengwen Feng
2022-04-28 13:15   ` [PATCH v2 6/9] ethdev: fix memory leak when telemetry xstats Chengwen Feng
2022-04-28 13:15   ` [PATCH v2 7/9] ethdev: support auto-filled flag when telemetry stats Chengwen Feng
2022-04-28 13:15   ` [PATCH v2 8/9] ethdev: fix possible null pointer access Chengwen Feng
2022-04-28 13:16   ` [PATCH v2 9/9] net/cnxk: fix telemetry " Chengwen Feng
2022-05-05  8:02 ` [PATCH v3 00/10] bugfix for ethdev telemetry Chengwen Feng
2022-05-05  8:02   ` [PATCH v3 01/10] ethdev: define retval when xstats is null of get xstats Chengwen Feng
2022-05-05  8:02   ` [PATCH v3 02/10] ethdev: optimize xstats-get API's implementation Chengwen Feng
2022-05-12 10:31     ` Andrew Rybchenko
2022-05-05  8:02   ` [PATCH v3 03/10] net/hns3: adjust retval when xstats is null of get xstats Chengwen Feng
2022-05-12  9:51     ` Andrew Rybchenko
2022-05-05  8:02   ` [PATCH v3 04/10] net/ipn3ke: " Chengwen Feng
2022-05-05  8:02   ` [PATCH v3 05/10] net/mvpp2: " Chengwen Feng
2022-05-05  8:02   ` [PATCH v3 06/10] net/axgbe: " Chengwen Feng
2022-05-12 10:00     ` Andrew Rybchenko
2022-05-05  8:02   ` [PATCH v3 07/10] ethdev: fix memory leak when telemetry xstats Chengwen Feng
2022-05-05  8:02   ` [PATCH v3 08/10] ethdev: support auto-filled flag when telemetry stats Chengwen Feng
2022-05-12 10:26     ` Andrew Rybchenko
2022-05-05  8:02   ` [PATCH v3 09/10] ethdev: fix possible null pointer access Chengwen Feng
2022-05-12 10:29     ` Andrew Rybchenko
2022-05-05  8:02   ` [PATCH v3 10/10] net/cnxk: fix telemetry " Chengwen Feng
2022-05-12 10:30     ` Andrew Rybchenko
2022-05-13  2:53 ` [PATCH v4 0/9] bugfix for ethdev telemetry Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 1/9] ethdev: specify return value of xstats-get API Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 2/9] ethdev: optimize xstats-get API's implementation Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 3/9] net/hns3: adjust return value of xstats-get ops Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 4/9] net/ipn3ke: " Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 5/9] net/mvpp2: " Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 6/9] net/axgbe: " Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 7/9] ethdev: fix memory leak when telemetry xstats Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 8/9] ethdev: fix possible null pointer access Chengwen Feng
2022-05-13  2:53   ` [PATCH v4 9/9] net/cnxk: fix telemetry " Chengwen Feng
2022-05-16  8:43   ` [PATCH v4 0/9] bugfix for ethdev telemetry Morten Brørup
2022-05-20 14:50     ` Andrew Rybchenko

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