From: "Morten Brørup" <mb@smartsharesystems.com>
To: "fengchengwen" <fengchengwen@huawei.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: Mon, 25 Apr 2022 12:16:22 +0200 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35D86FF7@smartserver.smartshare.dk> (raw)
In-Reply-To: <f0cb3543-bd57-8978-e9c5-fa985540185f@huawei.com>
> 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.
>
> 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:[~2022-04-25 10:16 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 [this message]
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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