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From: Jakub Kicinski <kuba@kernel.org>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Jiri Pirko <jiri@mellanox.com>, Andrew Lunn <andrew@lunn.ch>,
	Robin Murphy <robin.murphy@arm.com>,
	Calvin Johnson <calvin.johnson@nxp.com>,
	stuyoder@gmail.com, nleeder@codeaurora.org,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Hanjun Guo <guohanjun@huawei.com>, Will Deacon <will@kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Pankaj Bansal <pankaj.bansal@nxp.com>,
	Jon Nettleton <jon@solid-run.com>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Len Brown <lenb@kernel.org>, Jason Cooper <jason@lakedaemon.net>,
	Andy Wang <Andy.Wang@arm.com>,
	Makarand Pawagi <makarand.pawagi@nxp.com>,
	Varun Sethi <V.Sethi@nxp.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Laurentiu Tudor <laurentiu.tudor@nxp.com>,
	Paul Yang <Paul.Yang@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	"<netdev@vger.kernel.org>" <netdev@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Shameerali Kolothum Thodi  <shameerali.kolothum.thodi@huawei.com>,
	Sudeep Holla <sudeep.holla@arm.com>
Subject: Re: [EXT] Re: [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc
Date: Sat, 1 Feb 2020 09:36:20 -0800	[thread overview]
Message-ID: <20200201093620.4b55d6fa@cakuba.hsd1.ca.comcast.net> (raw)
In-Reply-To: <20200201114919.GQ25745@shell.armlinux.org.uk>

On Sat, 1 Feb 2020 11:49:19 +0000, Russell King - ARM Linux admin wrote:
> What if someone decides to do:
> 
> 	devlink port split device/1 count 2
> 
> what do we end up with?  Presumably two network devices running with
> two serdes lanes each (if supported by the hardware).  At that point
> can they then do:
> 
> 	devlink port split device/2 count 2
> 
> and end up with one network device with two 10G serdes lanes, and two
> network devices each with one 10G serdes lane, 

I think all your guesses are correct, it's a pretty straight forward
API, but it's also pretty thin, and some of the logic is in FW, so
there isn't much in a way of a standard on how things should behave :S

> or can port splitting only be used on the "master" device/port ?

I think both mlxsw and the NFP rejects re-split/further splitting.
Ports have to be unsplit first. So there is only one device for
splitting, and unsplitting can be done on any of the sub-devices.

> Unfortunately, I don't think I have any network devices that support
> this so I can't experiment to find out how this should work; yes, I
> have a Mellanox card, but it supports a single 10G SFP+, and therefore
> does not support port splitting.

I think you'd need a mlxsw or an nfp to play with this.

Maybe Jiri can clarify further :)

WARNING: multiple messages have this Message-ID (diff)
From: Jakub Kicinski <kuba@kernel.org>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Andrew Lunn <andrew@lunn.ch>,
	Calvin Johnson <calvin.johnson@nxp.com>,
	stuyoder@gmail.com, nleeder@codeaurora.org,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Cristi Sovaiala <cristian.sovaiala@nxp.com>,
	Hanjun Guo <guohanjun@huawei.com>, Will Deacon <will@kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Pankaj Bansal <pankaj.bansal@nxp.com>,
	Jon Nettleton <jon@solid-run.com>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Len Brown <lenb@kernel.org>, Jason Cooper <jason@lakedaemon.net>,
	Andy Wang <Andy.Wang@arm.com>,
	Makarand Pawagi <makarand.pawagi@nxp.com>,
	Varun Sethi <V.Sethi@nxp.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Laurentiu Tudor <laurentiu.tudor@nxp.com>,
	Paul Yang <Paul.Yang@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	"<netdev@vger.kernel.org>" <netdev@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Jiri Pirko <jiri@mellanox.com>,
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Robin Murphy <robin.murphy@arm.com>
Subject: Re: [EXT] Re: [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc
Date: Sat, 1 Feb 2020 09:36:20 -0800	[thread overview]
Message-ID: <20200201093620.4b55d6fa@cakuba.hsd1.ca.comcast.net> (raw)
In-Reply-To: <20200201114919.GQ25745@shell.armlinux.org.uk>

On Sat, 1 Feb 2020 11:49:19 +0000, Russell King - ARM Linux admin wrote:
> What if someone decides to do:
> 
> 	devlink port split device/1 count 2
> 
> what do we end up with?  Presumably two network devices running with
> two serdes lanes each (if supported by the hardware).  At that point
> can they then do:
> 
> 	devlink port split device/2 count 2
> 
> and end up with one network device with two 10G serdes lanes, and two
> network devices each with one 10G serdes lane, 

I think all your guesses are correct, it's a pretty straight forward
API, but it's also pretty thin, and some of the logic is in FW, so
there isn't much in a way of a standard on how things should behave :S

> or can port splitting only be used on the "master" device/port ?

I think both mlxsw and the NFP rejects re-split/further splitting.
Ports have to be unsplit first. So there is only one device for
splitting, and unsplitting can be done on any of the sub-devices.

> Unfortunately, I don't think I have any network devices that support
> this so I can't experiment to find out how this should work; yes, I
> have a Mellanox card, but it supports a single 10G SFP+, and therefore
> does not support port splitting.

I think you'd need a mlxsw or an nfp to play with this.

Maybe Jiri can clarify further :)

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-02-01 17:36 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-28  8:08 [PATCH] bus: fsl-mc: Add ACPI support for fsl-mc Makarand Pawagi
2020-01-28  8:08 ` Makarand Pawagi
2020-01-28 10:58 ` Marc Zyngier
2020-01-28 10:58   ` Marc Zyngier
2020-01-28 11:09 ` Lorenzo Pieralisi
2020-01-28 11:09   ` Lorenzo Pieralisi
2020-01-31 10:35   ` [EXT] " Makarand Pawagi
2020-01-31 10:35     ` Makarand Pawagi
2020-01-31 11:06     ` Lorenzo Pieralisi
2020-01-31 11:06       ` Lorenzo Pieralisi
2020-01-31 11:06     ` Marc Zyngier
2020-01-31 11:06       ` Marc Zyngier
2020-01-31 12:01       ` Ard Biesheuvel
2020-01-31 12:01         ` Ard Biesheuvel
2020-01-31 12:28         ` Jon Nettleton
2020-01-31 12:28           ` Jon Nettleton
2020-01-31 12:48           ` Robin Murphy
2020-01-31 12:48             ` Robin Murphy
2020-01-31 13:11             ` Jon Nettleton
2020-01-31 13:11               ` Jon Nettleton
2020-01-31 13:29               ` Ard Biesheuvel
2020-01-31 13:29                 ` Ard Biesheuvel
2020-01-31 13:39               ` Robin Murphy
2020-01-31 13:39                 ` Robin Murphy
2020-01-31 14:29                 ` Andrew Lunn
2020-01-31 14:29                   ` Andrew Lunn
2020-01-31 14:47                   ` Will Deacon
2020-01-31 14:47                     ` Will Deacon
2020-01-31 15:09                     ` Andrew Lunn
2020-01-31 15:09                       ` Andrew Lunn
2020-01-31 15:14                       ` Jon Nettleton
2020-01-31 15:14                         ` Jon Nettleton
2020-01-31 15:41                         ` Andrew Lunn
2020-01-31 15:41                           ` Andrew Lunn
2020-01-31 15:39                       ` Russell King - ARM Linux admin
2020-01-31 15:39                         ` Russell King - ARM Linux admin
2020-01-31 15:15                   ` Russell King - ARM Linux admin
2020-01-31 15:15                     ` Russell King - ARM Linux admin
2020-01-31 15:40                     ` Jakub Kicinski
2020-01-31 15:40                       ` Jakub Kicinski
2020-02-01 11:49                       ` Russell King - ARM Linux admin
2020-02-01 11:49                         ` Russell King - ARM Linux admin
2020-02-01 17:36                         ` Jakub Kicinski [this message]
2020-02-01 17:36                           ` Jakub Kicinski
2020-02-14 15:05         ` Pankaj Bansal
2020-02-14 15:05           ` Pankaj Bansal
2020-02-14 15:54           ` Marc Zyngier
2020-02-14 15:54             ` Marc Zyngier
2020-02-14 15:58             ` Pankaj Bansal
2020-02-14 15:58               ` Pankaj Bansal
2020-02-14 16:19               ` Lorenzo Pieralisi
2020-02-14 16:19                 ` Lorenzo Pieralisi
2020-02-14 16:35                 ` Pankaj Bansal
2020-02-14 16:35                   ` Pankaj Bansal
2020-02-14 17:49                   ` Lorenzo Pieralisi
2020-02-14 17:49                     ` Lorenzo Pieralisi
2020-02-17 12:35                     ` Pankaj Bansal
2020-02-17 12:35                       ` Pankaj Bansal
2020-02-17 15:25                       ` Lorenzo Pieralisi
2020-02-17 15:25                         ` Lorenzo Pieralisi
2020-02-17 15:35                         ` Marc Zyngier
2020-02-17 15:35                           ` Marc Zyngier
2020-02-17 16:26                           ` Lorenzo Pieralisi
2020-02-17 16:26                             ` Lorenzo Pieralisi
2020-02-18  8:02                         ` Pankaj Bansal (OSS)
2020-02-18  8:02                           ` Pankaj Bansal (OSS)
2020-02-14 16:29               ` Robin Murphy
2020-02-14 16:29                 ` Robin Murphy

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