linux-kernel - Re: [Patch net-next v14 10/13] net: dsa: microchip: lan937x: add phylink_get

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Date:   Fri, 1 Jul 2022 08:37:58 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <linux@...linux.org.uk>
CC:     <olteanv@...il.com>, <linux-kernel@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>, <vivien.didelot@...il.com>,
        <ast@...nel.org>, <bpf@...r.kernel.org>, <andrew@...n.ch>,
        <devicetree@...r.kernel.org>, <robh+dt@...nel.org>,
        <andrii@...nel.org>, <songliubraving@...com>,
        <f.fainelli@...il.com>, <daniel@...earbox.net>,
        <john.fastabend@...il.com>, <kuba@...nel.org>,
        <edumazet@...gle.com>, <pabeni@...hat.com>, <kpsingh@...nel.org>,
        <netdev@...r.kernel.org>, <Woojung.Huh@...rochip.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <yhs@...com>,
        <davem@...emloft.net>, <kafai@...com>
Subject: Re: [Patch net-next v14 10/13] net: dsa: microchip: lan937x: add
 phylink_get_caps support

On Fri, 2022-07-01 at 09:07 +0100, Russell King (Oracle) wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> On Fri, Jul 01, 2022 at 05:51:33AM +0000, Arun.Ramadoss@...rochip.com
>  wrote:
> > > > +void lan937x_phylink_get_caps(struct ksz_device *dev, int
> > > > port,
> > > > +                           struct phylink_config *config)
> > > > +{
> > > > +     config->mac_capabilities = MAC_100FD;
> > > > +
> > > > +     if (dev->info->supports_rgmii[port]) {
> > > > +             /* MII/RMII/RGMII ports */
> > > > +             config->mac_capabilities |= MAC_ASYM_PAUSE |
> > > > MAC_SYM_PAUSE |
> > > > +                                         MAC_100HD | MAC_10 |
> > > > MAC_1000FD;
> > > 
> > > And SGMII too? (Which seems to be a given because from your list
> > > in
> > > the
> > > series cover message, SGMII ports also support RGMII).
> > 
> > No, SGMII port does not support the RGMII. I have mentioned in the
> > cover message that LAN9373 has 2 RGMII and 1 SGMII port. No other
> > part
> > number has SGMII port.
> 
> So when using SGMII, there's no way for pause frames to be supported?
> It seems a bit weird that the pause frame capability is dependent on
> the interface type, as pause frames are just the same as normal
> ethernet frames, except they're ggenerally enerated and/or
> interpreted
> by the MAC.

As per the comment, I infer that you want to include the capability of
SGMII port as well. As of now, we implemented the dsa for RMII/RGMII.
Yet to implement and test the SGMII port. Since we have not tested the
port, we haven't included it. As per datasheet, SGMII port supports the
flow control.

> 
> --
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