From: David Marchand <david.marchand@redhat.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: dev <dev@dpdk.org>, Ferruh Yigit <ferruh.yigit@intel.com>,
Andrew Rybchenko <arybchenko@solarflare.com>,
"Stokes, Ian" <ian.stokes@intel.com>,
Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [dpdk-dev] [RFC PATCH 1/2] ethdev: introduce internal rxq/txq stats API
Date: Fri, 12 Apr 2019 16:32:01 +0200 [thread overview]
Message-ID: <CAJFAV8xqV1wyTyY3tBi=RK9SxyqX2tFT0JNt8BtbBpkju307hA@mail.gmail.com> (raw)
Message-ID: <20190412143201.kN0vBfQ9_z7u0m3L9ihjhsysV1dn_KzT6T0HKkM9c74@z> (raw)
In-Reply-To: <1745620.RIKK5OcHtz@xps>
On Fri, Apr 12, 2019 at 3:29 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> 26/03/2019 10:29, David Marchand:
> > On Tue, Mar 19, 2019 at 6:18 PM Ferruh Yigit <ferruh.yigit@intel.com>
> wrote:
> >
> > > On 3/14/2019 3:13 PM, David Marchand wrote:
> > > > Introduce a new api to retrieve per queue statistics from the
> drivers.
> > > > The api objectives:
> > > > - easily add some common per queue statistics and have it exposed
> > > > through the user xstats api while the user stats api is left
> untouched
> > > > - remove the limitations on the per queue statistics count (inherited
> > > > from ixgbe) and avoid recurrent bugs on stats array overflow
>
> First comment, I think it would be easier to read if renaming the legacy
> basic stats interface was in a separate patch.
>
It will be quite artificial, but I can do this yes.
> > > The patch is adding two new dev_ops 'rxq_stats_get' & 'txq_stats_get',
> my
> > > concern is if it is overkill to have three dev_ops to get stats
> > > and I am feeling that is making xstat code more complex.
> >
> > Having these new (meant to be) internal dev_ops has the avantage of
> > separating the statistics reported from the drivers from the exported
> api.
> > This is also why I did not prefix the structure names with rte_.
>
> Yes, and to make it clear, please do not talk about API,
> as it is only a driver interface.
>
Ok, so I will describe this as a "driver interface" update.
> > The "complex" part is in a single place, ethdev and this is when
> > translating from an internal representation to the exposed bits in the
> > public apis.
> >
> > Would it be simpler to add 'q_ierrors' & 'q_oerrors' to 'struct
> > > rte_eth_stats'?
> > >
> >
> > It does not solve the problem of drivers that are buggy because of the
> > limit on RTE_ETHDEV_QUEUE_STAT_CNTRS.
> > All drivers need to be aware of this limitation of the rte_eth_stats
> > structure.
>
> Yes, this limitation should be dropped.
> I would like to see the functions rte_eth_dev_set_?x_queue_stats_mapping()
> deprecated as they were a bad abstraction of ixgbe limitation.
>
That's a different topic from my pov, but yes, this mapping stuff should go
away, later.
> > And perhaps we can do the 'fix rxq q_errors' patchset [1] after this
> > > change, so
> > > fix can be done with less changes, although it will push the fix into
> next
> > > release because of the ABI break.
> >
> > I am fine with merging this together, we don't want to backport this
> > anyway, right?
>
> No, it would make some behaviours changing in stable releases,
> so better to not backport it and keep the buggy behaviour in old branches.
>
Since the time I had posted this RFC, I have worked on a RFC v2, I will
post this next week, with the drivers I found time to convert.
We will have to take a decision on what goes to -rc2 between this and the
q_errors[] patchset.
--
David Marchand
next prev parent reply other threads:[~2019-04-12 14:32 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-04 11:18 [dpdk-dev] [PATCH 00/12] rxq q_errors[] statistics fixes David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 01/12] net/af_packet: fix incorrect rxq errors stat David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 02/12] net/avp: " David Marchand
2019-03-04 12:18 ` Legacy, Allain
2019-03-04 11:18 ` [dpdk-dev] [PATCH 03/12] net/bnxt: " David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 04/12] net/cxgbe: " David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 05/12] net/kni: " David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 06/12] net/mlx4: " David Marchand
2019-03-05 8:19 ` Shahaf Shuler
2019-03-04 11:18 ` [dpdk-dev] [PATCH 07/12] net/mlx5: " David Marchand
2019-03-05 8:18 ` Shahaf Shuler
2019-03-04 11:18 ` [dpdk-dev] [PATCH 08/12] net/null: " David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 09/12] net/pcap: " David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 10/12] net/ring: " David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 11/12] net/szedata2: " David Marchand
2019-03-04 11:18 ` [dpdk-dev] [PATCH 12/12] net/tap: " David Marchand
2019-03-04 13:58 ` Wiles, Keith
2019-03-11 17:22 ` [dpdk-dev] [PATCH 00/12] rxq q_errors[] statistics fixes Ferruh Yigit
2019-03-11 18:09 ` David Marchand
2019-03-14 15:12 ` David Marchand
2019-03-14 15:12 ` David Marchand
2019-03-14 15:13 ` [dpdk-dev] [RFC PATCH 1/2] ethdev: introduce internal rxq/txq stats API David Marchand
2019-03-14 15:13 ` David Marchand
2019-03-14 15:13 ` [dpdk-dev] [RFC PATCH 2/2] net/af_packet: convert to new " David Marchand
2019-03-14 15:13 ` David Marchand
2019-03-15 13:30 ` [dpdk-dev] [RFC PATCH 1/2] ethdev: introduce internal " David Marchand
2019-03-15 13:30 ` David Marchand
2019-03-19 17:18 ` Ferruh Yigit
2019-03-19 17:18 ` Ferruh Yigit
2019-03-19 17:54 ` Stephen Hemminger
2019-03-19 17:54 ` Stephen Hemminger
2019-04-12 13:18 ` Thomas Monjalon
2019-04-12 13:18 ` Thomas Monjalon
2019-03-26 9:29 ` David Marchand
2019-03-26 9:29 ` David Marchand
2019-04-12 13:29 ` Thomas Monjalon
2019-04-12 13:29 ` Thomas Monjalon
2019-04-12 14:32 ` David Marchand [this message]
2019-04-12 14:32 ` David Marchand
2019-04-12 16:05 ` Stephen Hemminger
2019-04-12 16:05 ` Stephen Hemminger
2019-04-12 15:07 ` [dpdk-dev] [PATCH 00/12] rxq q_errors[] statistics fixes Thomas Monjalon
2019-04-12 15:07 ` Thomas Monjalon
2019-04-12 15:38 ` Ferruh Yigit
2019-04-12 15:38 ` Ferruh Yigit
2019-04-12 15:45 ` Thomas Monjalon
2019-04-12 15:45 ` Thomas Monjalon
2019-04-12 15:57 ` Ferruh Yigit
2019-04-12 15:57 ` Ferruh Yigit
2019-05-28 21:38 ` Yigit, Ferruh
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