From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Matteo Croce <mcroce@redhat.com>
Cc: Maxime Chevallier <maxime.chevallier@bootlin.com>,
"David S . Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Antoine Tenart <antoine.tenart@bootlin.com>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
gregory.clement@bootlin.com, miquel.raynal@bootlin.com,
Nadav Haklai <nadavh@marvell.com>,
Stefan Chulski <stefanc@marvell.com>,
Marcin Wojtas <mw@semihalf.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to handle RSS tables
Date: Thu, 23 Apr 2020 18:00:03 +0100 [thread overview]
Message-ID: <20200423170003.GT25745@shell.armlinux.org.uk> (raw)
In-Reply-To: <CAGnkfhzsx_uEPkZQC-_-_NamTigD8J0WgcDioqMLSHVFa3V6GQ@mail.gmail.com>
On Tue, Apr 14, 2020 at 01:43:02AM +0200, Matteo Croce wrote:
> On Tue, Apr 14, 2020 at 1:21 AM Maxime Chevallier
> <maxime.chevallier@bootlin.com> wrote:
> >
> > The PPv2 controller has 8 RSS tables that are shared across all ports on
> > a given PPv2 instance. The previous implementation allocated one table
> > per port, leaving others unused.
> >
> > By using RSS contexts, we can make use of multiple RSS tables per
> > port, one being the default table (always id 0), the other ones being
> > used as destinations for flow steering, in the same way as rx rings.
> >
> > This commit introduces RSS contexts management in the PPv2 driver. We
> > always reserve one table per port, allocated when the port is probed.
> >
> > The global table list is stored in the struct mvpp2, as it's a global
> > resource. Each port then maintains a list of indices in that global
> > table, that way each port can have it's own numbering scheme starting
> > from 0.
> >
> > One limitation that seems unavoidable is that the hashing parameters are
> > shared across all RSS contexts for a given port. Hashing parameters for
> > ctx 0 will be applied to all contexts.
> >
> > Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
>
> Hi all,
>
> I noticed that enabling rxhash blocks the RX on my Macchiatobin. It
> works fine with the 10G ports (the RX rate goes 4x up) but it
> completely kills the gigabit interface.
>
> # 10G port
> root@macchiatobin:~# iperf3 -c 192.168.0.2
> Connecting to host 192.168.0.2, port 5201
> [ 5] local 192.168.0.1 port 42394 connected to 192.168.0.2 port 5201
> [ ID] Interval Transfer Bitrate Retr Cwnd
> [ 5] 0.00-1.00 sec 941 MBytes 7.89 Gbits/sec 4030 250 KBytes
> [ 5] 1.00-2.00 sec 933 MBytes 7.82 Gbits/sec 4393 240 KBytes
> root@macchiatobin:~# ethtool -K eth0 rxhash on
> root@macchiatobin:~# iperf3 -c 192.168.0.2
> Connecting to host 192.168.0.2, port 5201
> [ 5] local 192.168.0.1 port 42398 connected to 192.168.0.2 port 5201
> [ ID] Interval Transfer Bitrate Retr Cwnd
> [ 5] 0.00-1.00 sec 860 MBytes 7.21 Gbits/sec 428 410 KBytes
> [ 5] 1.00-2.00 sec 859 MBytes 7.20 Gbits/sec 185 563 KBytes
>
> # gigabit port
> root@macchiatobin:~# iperf3 -c turbo
> Connecting to host turbo, port 5201
> [ 5] local 192.168.85.42 port 45144 connected to 192.168.85.6 port 5201
> [ ID] Interval Transfer Bitrate Retr Cwnd
> [ 5] 0.00-1.00 sec 113 MBytes 948 Mbits/sec 0 407 KBytes
> [ 5] 1.00-2.00 sec 112 MBytes 942 Mbits/sec 0 428 KBytes
> root@macchiatobin:~# ethtool -K eth2 rxhash on
> root@macchiatobin:~# iperf3 -c turbo
> iperf3: error - unable to connect to server: Resource temporarily unavailable
>
> I've bisected and it seems that this commit causes the issue. I tried
> to revert it on nex-next as a second test, but the code has changed a
> lot much since, generating too much conflicts.
> Can you have a look into this?
This behaviour on eth2 is confirmed here on v5.6. Turning on rxhash
appears to prevent eth2 working.
Maxime, please look into this regression, thanks.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up
next prev parent reply other threads:[~2020-04-23 17:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-24 10:05 [PATCH net-next 0/5] net: mvpp2: Classifier updates, RSS Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 1/5] net: mvpp2: cls: Use the correct number of rules in various places Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 2/5] net: mvpp2: cls: Bypass C2 internals FIFOs at init Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to handle RSS tables Maxime Chevallier
2020-04-13 23:43 ` Matteo Croce
2020-04-23 17:00 ` Russell King - ARM Linux admin [this message]
2020-05-09 0:12 ` Matteo Croce
2020-05-09 11:15 ` [EXT] " Stefan Chulski
2020-05-09 11:45 ` Russell King - ARM Linux admin
2020-05-09 12:16 ` Thomas Petazzoni
2020-05-09 12:48 ` Russell King - ARM Linux admin
2020-05-09 13:10 ` Thomas Petazzoni
2020-05-09 13:14 ` Matteo Croce
2020-05-09 13:51 ` Russell King - ARM Linux admin
2020-05-09 14:48 ` Russell King - ARM Linux admin
2020-05-09 15:31 ` Matteo Croce
2020-05-09 19:52 ` Russell King - ARM Linux admin
2020-05-09 20:20 ` Russell King - ARM Linux admin
2020-05-19 9:53 ` Russell King - ARM Linux admin
2020-05-19 10:05 ` Matteo Croce
2020-05-19 17:05 ` Matteo Croce
2020-05-20 11:10 ` Russell King - ARM Linux admin
2020-05-20 11:16 ` Matteo Croce
2020-05-20 11:18 ` Russell King - ARM Linux admin
2020-05-09 12:16 ` Matteo Croce
2020-05-09 12:31 ` Stefan Chulski
2020-05-09 13:25 ` Russell King - ARM Linux admin
2019-05-24 10:05 ` [PATCH net-next 4/5] net: mvpp2: cls: Extract the RSS context when parsing the ethtool rule Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 5/5] net: mvpp2: cls: Support steering to RSS contexts Maxime Chevallier
2019-05-25 23:38 ` [PATCH net-next 0/5] net: mvpp2: Classifier updates, RSS David Miller
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