From: fengchengwen <fengchengwen@huawei.com>
To: 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: Sun, 24 Apr 2022 11:44:59 +0800 [thread overview]
Message-ID: <f0cb3543-bd57-8978-e9c5-fa985540185f@huawei.com> (raw)
In-Reply-To: <c3ebf4d9-aa2a-1dd5-4377-e06c7d56e7d1@oktetlabs.ru>
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 ?
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
>
> .
next prev parent reply other threads:[~2022-04-24 3:45 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 [this message]
2022-04-25 10:16 ` Morten Brørup
2022-04-28 13:38 ` fengchengwen
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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