From: Robert Beckett <bob.beckett@collabora.com>
To: Florian Fainelli <f.fainelli@gmail.com>, netdev@vger.kernel.org
Cc: Andrew Lunn <andrew@lunn.ch>,
Vivien Didelot <vivien.didelot@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Ido Schimmel <idosch@mellanox.com>, Jiri Pirko <jiri@resnulli.us>,
bob.beckett@collabora.com
Subject: Re: [PATCH 0/7] net: dsa: mv88e6xxx: features to handle network storms
Date: Wed, 11 Sep 2019 10:43:55 +0100 [thread overview]
Message-ID: <ad14d3b2712a8b6bca423727a935924962d80938.camel@collabora.com> (raw)
In-Reply-To: <545d6473-848f-3194-02a6-011b7c89a2ca@gmail.com>
On Tue, 2019-09-10 at 09:49 -0700, Florian Fainelli wrote:
> +Ido, Jiri,
>
> On 9/10/19 8:41 AM, Robert Beckett wrote:
> > This patch-set adds support for some features of the Marvell switch
> > chips that can be used to handle packet storms.
> >
> > The rationale for this was a setup that requires the ability to
> > receive
> > traffic from one port, while a packet storm is occuring on another
> > port
> > (via an external switch with a deliberate loop). This is needed to
> > ensure vital data delivery from a specific port, while mitigating
> > any
> > loops or DoS that a user may introduce on another port (can't
> > guarantee
> > sensible users).
>
> The use case is reasonable, but the implementation is not really. You
> are using Device Tree which is meant to describe hardware as a policy
> holder for setting up queue priorities and likewise for queue
> scheduling.
>
> The tool that should be used for that purpose is tc and possibly an
> appropriately offloaded queue scheduler in order to map the desired
> scheduling class to what the hardware supports.
Thanks for the review and tip about tc. Im currently not familiar with
that tool. Ill investigate it as an alternative approach.
>
> Jiri, Ido, how do you guys support this with mlxsw?
>
> >
> > [patch 1/7] configures auto negotiation for CPU ports connected
> > with
> > phys to enable pause frame propogation.
> >
> > [patch 2/7] allows setting of port's default output queue priority
> > for
> > any ingressing packets on that port.
> >
> > [patch 3/7] dt-bindings for patch 2.
> >
> > [patch 4/7] allows setting of a port's queue scheduling so that it
> > can
> > prioritise egress of traffic routed from high priority ports.
> >
> > [patch 5/7] dt-bindings for patch 4.
> >
> > [patch 6/7] allows ports to rate limit their egress. This can be
> > used to
> > stop the host CPU from becoming swamped by packet delivery and
> > exhasting
> > descriptors.
> >
> > [patch 7/7] dt-bindings for patch 6.
> >
> >
> > Robert Beckett (7):
> > net/dsa: configure autoneg for CPU port
> > net: dsa: mv88e6xxx: add ability to set default queue priorities
> > per
> > port
> > dt-bindings: mv88e6xxx: add ability to set default queue
> > priorities
> > per port
> > net: dsa: mv88e6xxx: add ability to set queue scheduling
> > dt-bindings: mv88e6xxx: add ability to set queue scheduling
> > net: dsa: mv88e6xxx: add egress rate limiting
> > dt-bindings: mv88e6xxx: add egress rate limiting
> >
> > .../devicetree/bindings/net/dsa/marvell.txt | 38 +++++
> > drivers/net/dsa/mv88e6xxx/chip.c | 122 ++++++++++++
> > ---
> > drivers/net/dsa/mv88e6xxx/chip.h | 5 +-
> > drivers/net/dsa/mv88e6xxx/port.c | 140
> > +++++++++++++++++-
> > drivers/net/dsa/mv88e6xxx/port.h | 24 ++-
> > include/dt-bindings/net/dsa-mv88e6xxx.h | 22 +++
> > net/dsa/port.c | 10 ++
> > 7 files changed, 327 insertions(+), 34 deletions(-)
> > create mode 100644 include/dt-bindings/net/dsa-mv88e6xxx.h
> >
>
>
next prev parent reply other threads:[~2019-09-11 9:44 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-10 15:41 [PATCH 0/7] net: dsa: mv88e6xxx: features to handle network storms Robert Beckett
2019-09-10 15:41 ` [PATCH 1/7] net/dsa: configure autoneg for CPU port Robert Beckett
2019-09-10 16:14 ` Vivien Didelot
2019-09-10 16:56 ` Florian Fainelli
2019-09-10 18:26 ` Andrew Lunn
2019-09-10 18:29 ` Florian Fainelli
2019-09-11 9:16 ` Robert Beckett
2019-09-11 9:54 ` Robert Beckett
2019-09-11 22:52 ` Andrew Lunn
2019-09-12 10:14 ` Robert Beckett
2019-09-12 10:43 ` Andrew Lunn
2019-09-11 11:43 ` kbuild test robot
2019-09-14 7:16 ` kbuild test robot
2019-09-10 15:41 ` [PATCH 2/7] net: dsa: mv88e6xxx: add ability to set default queue priorities per port Robert Beckett
2019-09-10 16:43 ` Vivien Didelot
2019-09-10 15:41 ` [PATCH 3/7] dt-bindings: " Robert Beckett
2019-09-10 16:42 ` Florian Fainelli
2019-09-10 16:49 ` Vivien Didelot
2019-09-10 20:46 ` Vladimir Oltean
2019-09-10 15:41 ` [PATCH 4/7] net: dsa: mv88e6xxx: add ability to set queue scheduling Robert Beckett
2019-09-10 17:18 ` Vivien Didelot
2019-09-10 15:41 ` [PATCH 5/7] dt-bindings: " Robert Beckett
2019-09-10 15:41 ` [PATCH 6/7] net: dsa: mv88e6xxx: add egress rate limiting Robert Beckett
2019-09-10 17:13 ` Vivien Didelot
2019-09-11 12:26 ` kbuild test robot
2019-09-10 15:41 ` [PATCH 7/7] dt-bindings: " Robert Beckett
2019-09-10 16:49 ` [PATCH 0/7] net: dsa: mv88e6xxx: features to handle network storms Florian Fainelli
2019-09-11 9:43 ` Robert Beckett [this message]
2019-09-11 11:21 ` Ido Schimmel
2019-09-11 11:49 ` Robert Beckett
2019-09-11 22:58 ` Andrew Lunn
2019-09-12 9:05 ` Ido Schimmel
2019-09-12 9:03 ` Ido Schimmel
2019-09-12 9:21 ` Andrew Lunn
2019-09-12 16:25 ` Florian Fainelli
2019-09-12 16:46 ` Robert Beckett
2019-09-12 17:41 ` Florian Fainelli
2019-09-13 12:47 ` Robert Beckett
2019-09-10 17:19 ` Vivien Didelot
2019-09-11 9:46 ` Robert Beckett
2019-09-11 15:31 ` Vivien Didelot
2019-09-11 23:01 ` Andrew Lunn
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