Re: [PATCH net-next v3 04/10] net: sparx5: add port module support

[Steen Hegelund]

Hi Russell,

Thanks for your comments.


On Mon, 2021-06-07 at 10:21 +0100, Russell King (Oracle) wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Fri, Jun 04, 2021 at 10:55:54AM +0200, Steen Hegelund wrote:
> > This add configuration of the Sparx5 port module instances.
> > 
> > Sparx5 has in total 65 logical ports (denoted D0 to D64) and 33
> > physical SerDes connections (S0 to S32).  The 65th port (D64) is fixed
> > allocated to SerDes0 (S0). The remaining 64 ports can in various
> > multiplexing scenarios be connected to the remaining 32 SerDes using
> > QSGMII, or USGMII or USXGMII extenders. 32 of the ports can have a 1:1
> > mapping to the 32 SerDes.
> > 
> > Some additional ports (D65 to D69) are internal to the device and do not
> > connect to port modules or SerDes macros. For example, internal ports are
> > used for frame injection and extraction to the CPU queues.
> > 
> > The 65 logical ports are split up into the following blocks.
> > 
> > - 13 x 5G ports (D0-D11, D64)
> > - 32 x 2G5 ports (D16-D47)
> > - 12 x 10G ports (D12-D15, D48-D55)
> > - 8 x 25G ports (D56-D63)
> > 
> > Each logical port supports different line speeds, and depending on the
> > speeds supported, different port modules (MAC+PCS) are needed. A port
> > supporting 5 Gbps, 10 Gbps, or 25 Gbps as maximum line speed, will have a
> > DEV5G, DEV10G, or DEV25G module to support the 5 Gbps, 10 Gbps (incl 5
> > Gbps), or 25 Gbps (including 10 Gbps and 5 Gbps) speeds. As well as, it
> > will have a shadow DEV2G5 port module to support the lower speeds
> > (10/100/1000/2500Mbps). When a port needs to operate at lower speed and the
> > shadow DEV2G5 needs to be connected to its corresponding SerDes
> > 
> > Not all interface modes are supported in this series, but will be added at
> > a later stage.
> 
> It looks to me like the phylink code in your patch series is based on
> an older version of phylink and hasn't been updated for the split PCS
> support - you seem to be munging the PCS parts in with the MAC
> callbacks. If so, please update to the modern way of dealing with this.
> 
> If that isn't the case, please explain why you are not using the split
> PCS support.

I need to be able to let the user set the speed to get the link up.

So far I have only been able to get the user configured speeds via the mac_ops, but if this is also
possible via the pcs_ops, there should not anything preventing me from using these ops instead.

Will the pcs_ops also support this?

> 
> Thanks.
> 
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-- 
BR
Steen

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