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From: Gerhard Engleder <gerhard@engleder-embedded.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: David Miller <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, netdev <netdev@vger.kernel.org>,
	devicetree@vger.kernel.org
Subject: Re: [PATCH net-next 4/5] tsnep: Add TSN endpoint Ethernet MAC driver
Date: Wed, 28 Jul 2021 10:24:06 +0200	[thread overview]
Message-ID: <CANr-f5wYUK4R_XsujwvhSbz-t3==UefQ9VM9kgoaP+Y-Qs_Aww@mail.gmail.com> (raw)
In-Reply-To: <YQCLg3iLubJW+3yB@lunn.ch>

On Wed, Jul 28, 2021 at 12:41 AM Andrew Lunn <andrew@lunn.ch> wrote:
>
> > I also expect some discussion about this feature. Mapping device specific
> > TX/RX queues to user space is not done in mainline Linux so far.
>
> That is probably not quite true. I expect GPUs do it, or at least
> something very similar.
>
> > I will follow your suggestion and drop tsnep_stream.c for the moment.
> > Any early comments about this feature are welcome, because the direct
> > use of additional TX/RX queues for real-time communication is the main
> > feature of this device.
>
> I know enough to know i don't know enough about cache management from
> user space to be able to make any sensible recommendations.
>
> You probably want to start a discussion with the XDP people and get
> them to agree XDP does not work for your use case. Also, the people
> who implemented zero-copy, MSG_ZEROCOPY and make sure that is also
> unsuitable. Then see if you can reuse some GPU code which has been
> well reviewed and tested. You will get less pushback that way,
> compared to your own code which will need a good review by somebody
> who understands all the issues.

I will try to follow your suggestions. Thanks!

Gerhard

  reply	other threads:[~2021-07-28  8:24 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26 19:45 [PATCH net-next 0/5] TSN endpoint Ethernet MAC driver Gerhard Engleder
2021-07-26 19:45 ` [PATCH net-next 1/5] dt-bindings: Add vendor prefix for Engleder Gerhard Engleder
2021-07-26 19:46 ` [PATCH net-next 2/5] dt-bindings: net: Add tsnep Ethernet controller Gerhard Engleder
2021-07-26 23:35   ` Rob Herring
2021-07-27 18:34     ` Gerhard Engleder
2021-07-27 20:25       ` Rob Herring
2021-07-27 20:33         ` Gerhard Engleder
2021-07-28  5:13         ` Michal Simek
2021-07-28  7:44           ` Gerhard Engleder
2021-07-28 10:55             ` Michal Simek
2021-07-28 20:14               ` Gerhard Engleder
2021-07-29  5:07                 ` Michal Simek
2021-07-29  7:07                   ` Gerhard Engleder
2021-07-29  7:57                     ` Michal Simek
2021-07-26 19:46 ` [PATCH net-next 3/5] dt-bindings: arm: Add Engleder bindings Gerhard Engleder
2021-07-26 19:46 ` [PATCH net-next 4/5] tsnep: Add TSN endpoint Ethernet MAC driver Gerhard Engleder
2021-07-26 20:49   ` Andrew Lunn
2021-07-27 20:18     ` Gerhard Engleder
2021-07-26 21:15   ` Andrew Lunn
2021-07-27 20:49     ` Gerhard Engleder
2021-07-26 21:29   ` Andrew Lunn
2021-07-27 22:05     ` Gerhard Engleder
2021-07-27 22:41       ` Andrew Lunn
2021-07-28  8:24         ` Gerhard Engleder [this message]
2021-07-26 23:25   ` kernel test robot
2021-07-26 23:25     ` kernel test robot
2021-07-26 19:46 ` [PATCH net-next 5/5] arm64: dts: zynqmp: Add ZCU104 based TSN endpoint Gerhard Engleder
2021-07-26 23:40   ` Rob Herring
2021-07-27 20:10     ` Gerhard Engleder
2021-07-27 20:17       ` Rob Herring
2021-07-27 20:23         ` Gerhard Engleder
2021-07-28  5:10           ` Michal Simek
2021-07-28  8:19             ` Gerhard Engleder
2021-07-28 10:58               ` Michal Simek
2021-07-28 20:51                 ` Gerhard Engleder
2021-07-29  5:22                   ` Michal Simek
2021-07-29  6:47                     ` Gerhard Engleder

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