netdev - Re: [PATCH 4/4] net: dsa: Add Lantiq / Intel DSA driver for vrx200

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Message-ID: <20180729164940.GB14420@lunn.ch>
Date:   Sun, 29 Jul 2018 18:49:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Hauke Mehrtens <hauke@...ke-m.de>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        john@...ozen.org, linux-mips@...ux-mips.org, dev@...sin.me,
        hauke.mehrtens@...el.com
Subject: Re: [PATCH 4/4] net: dsa: Add Lantiq / Intel DSA driver for vrx200

> >> +static const struct gswip_rmon_cnt_desc gswip_rmon_cnt[] = {
> >> +	/** Receive Packet Count (only packets that are accepted and not discarded). */
> >> +	MIB_DESC(1, 0x1F, "RxGoodPkts"),
> >> +	/** Receive Size 1024-1522 (or more, if configured) Packet Count. */
> >> +	MIB_DESC(1, 0x17, "RxMaxBytePkts"),
> >> +	/** Transmit Size 1024-1522 (or more, if configured) Packet Count. */
> >> +	MIB_DESC(1, 0x05, "TxMaxBytePkts"),
> > 
> > Most of the comments here don't add anything useful. Maybe remove
> > them?
> 
> Ok I removed them.

The comments i left above are useful, since they give additional
information which is not obvious from the name.

> Are the names ok, or should they follow any Linux definition?

There are no standard names. So each driver tends to be different.

> > Please return ETIMEOUT when needed. Maybe use one of the variants of
> > readx_poll_timeout().
> 
> I am returning ETIMEOUT now.
> 
> When I would use readx_poll_timeout() I can not use the gswip_mdio_r()
> function, because it takes two arguments and would have to use readl
> directly.

Yes, they don't always fit, which is why is said "maybe".

> > The names make this unclear. The callback is used to configure the MAC
> > layer when something happens at the PHY layer. phyaddr does not appear
> > to be an address, not should it be doing anything to a PHY.
> 
> I renamed this to phyconf, as this contains multiple configuration
> values. This tells the mac what settings the phy wants to use.

macconf might be better, since this is configuring the MAC, not the
PHY.

> This is sort of a firmware, but it is also in the GPL driver.
> Currently the probe function is not marked __init so we can not make
> this easily __initdata.
> It has 64 entries of 8 bytes each so, 512 bytes, I think we can put this
> into the code.

512 bytes is fine.

    Andrew