[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <f9b21a9d-4ae2-1f91-b621-2e27f746f661@linux.intel.com>
Date: Thu, 21 Sep 2023 20:25:05 +0800
From: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
David E Box <david.e.box@...ux.intel.com>,
Hans de Goede <hdegoede@...hat.com>, Mark Gross <markgross@...nel.org>,
Jose Abreu <Jose.Abreu@...opsys.com>, Heiner Kallweit
<hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>,
"David S . Miller" <davem@...emloft.net>, Eric Dumazet
<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Marek BehĂșn
<kabel@...nel.org>, Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Richard Cochran <richardcochran@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>, Wong Vee Khee
<veekhee@...le.com>, Jon Hunter <jonathanh@...dia.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Revanth Kumar Uppala <ruppala@...dia.com>,
Shenwei Wang <shenwei.wang@....com>,
Andrey Konovalov <andrey.konovalov@...aro.org>,
Jochen Henneberg <jh@...neberg-systemdesign.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, platform-driver-x86@...r.kernel.org,
linux-hwmon@...r.kernel.org, bpf@...r.kernel.org,
Voon Wei Feng <weifeng.voon@...el.com>,
Tan Tee Min <tee.min.tan@...ux.intel.com>,
Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
Lai Peter Jun Ann <jun.ann.lai@...el.com>
Subject: Re: [PATCH net-next v2 0/5] TSN auto negotiation between 1G and 2.5G
On 4/8/2023 8:04 pm, Andrew Lunn wrote:
> On Fri, Aug 04, 2023 at 04:45:22PM +0800, Choong Yong Liang wrote:
>> Intel platformsâ integrated Gigabit Ethernet controllers support
>> 2.5Gbps mode statically using BIOS programming. In the current
>> implementation, the BIOS menu provides an option to select between
>> 10/100/1000Mbps and 2.5Gbps modes. Based on the selection, the BIOS
>> programs the Phase Lock Loop (PLL) registers. The BIOS also read the
>> TSN lane registers from Flexible I/O Adapter (FIA) block and provided
>> 10/100/1000Mbps/2.5Gbps information to the stmmac driver. But
>> auto-negotiation between 10/100/1000Mbps and 2.5Gbps is not allowed.
>> The new proposal is to support auto-negotiation between 10/100/1000Mbps
>> and 2.5Gbps . Auto-negotiation between 10, 100, 1000Mbps will use
>> in-band auto negotiation. Auto-negotiation between 10/100/1000Mbps and
>> 2.5Gbps will work as the following proposed flow, the stmmac driver reads
>> the PHY link status registers then identifies the negotiated speed.
>> Based on the speed stmmac driver will identify TSN lane registers from
>> FIA then send IPC command to the Power Management controller (PMC)
>> through PMC driver/API. PMC will act as a proxy to programs the
>> PLL registers.
>
> Have you considered using out of band for all link modes? You might
> end up with a cleaner architecture, and not need any phylink/phylib
> hacks.
>
> Andrew
Hi Andrew,
After conducting a comprehensive study, it seems that implementing
out-of-band for all link modes might not be feasible. I may have missed
some key aspects during my analysis.
Would you be open to sharing a high-level idea of how we could potentially
make this feasible? Your insights would be greatly appreciated.
By the way, I've submitted a new design that not exposing phylink's AN mode
into phylib. Please help review it to determine if it is acceptable.
Powered by blists - more mailing lists