linux-kernel - Re: [PATCH net-next V2 1/5] net: lan743x: Add SFP support check flag

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Message-ID: <e5e4659c-a9e2-472b-957b-9eee80741ccf@lunn.ch>
Date: Thu, 12 Sep 2024 16:52:09 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, bryan.whitehead@...rochip.com,
	UNGLinuxDriver@...rochip.com, linux@...linux.org.uk,
	maxime.chevallier@...tlin.com, rdunlap@...radead.org,
	Steen.Hegelund@...rochip.com, daniel.machon@...rochip.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next V2 1/5] net: lan743x: Add SFP support check flag

On Thu, Sep 12, 2024 at 11:59:04AM +0530, Raju Lakkaraju wrote:
> Hi Andrew,
> 
> Thank you for review the patches.
> 
> The 09/11/2024 19:06, Andrew Lunn wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > 
> > > +     if (adapter->is_pci11x1x && !adapter->is_sgmii_en &&
> > > +         adapter->is_sfp_support_en) {
> > > +             netif_err(adapter, drv, adapter->netdev,
> > > +                       "Invalid eeprom cfg: sfp enabled with sgmii disabled");
> > > +             return -EINVAL;
> > 
> > is_sgmii_en actually means PCS? An SFP might need 1000BaseX or SGMII,
> 
> No, not really.
> The PCI11010/PCI1414 chip can support either an RGMII interface or
> an SGMII/1000Base-X/2500Base-X interface.

A generic name for SGMII/1000Base-X/2500Base-X would be PCS, or maybe
SERDES. To me, is_sgmii_en means SGMII is enabled, but in fact it
actually means SGMII/1000Base-X/2500Base-X is enabled. I just think
this is badly named. It would be more understandable if it was
is_pcs_en.

> According to the datasheet,
> the "Strap Register (STRAP)" bit 6 is described as "SGMII_EN_STRAP"
> Therefore, the flag is named "is_sgmii_en".

Just because the datasheet uses a bad name does not mean the driver
has to also use it.

	Andrew