LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
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

  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200423170003.GT25745@shell.armlinux.org.uk \
    --to=linux@armlinux.org.uk \
    --cc=antoine.tenart@bootlin.com \
    --cc=davem@davemloft.net \
    --cc=gregory.clement@bootlin.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maxime.chevallier@bootlin.com \
    --cc=mcroce@redhat.com \
    --cc=miquel.raynal@bootlin.com \
    --cc=mw@semihalf.com \
    --cc=nadavh@marvell.com \
    --cc=netdev@vger.kernel.org \
    --cc=stefanc@marvell.com \
    --cc=thomas.petazzoni@bootlin.com \
    --subject='Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to handle RSS tables' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).