netdev - Re: [RFC PATCH net-next v2 09/17] ethtool: implement GET

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Date:   Mon, 30 Jul 2018 17:56:09 -0700
From:   Jakub Kicinski <kubakici@...pl>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        "John W. Linville" <linville@...driver.com>
Subject: Re: [RFC PATCH net-next v2 09/17] ethtool: implement GET_DRVINFO
 message

On Mon, 30 Jul 2018 14:53:27 +0200 (CEST), Michal Kubecek wrote:
> +GET_DRVINFO
> +-----------
> +
> +GET_DRVINFO request corresponds to ETHTOOL_GDRVINFO ioctl command and provides
> +basic driver information.
> +
> +Request contents:
> +
> +    ETHA_DRVINFO_DEV		(nested)	device identification
> +
> +Kernel response contents:
> +
> +    ETHA_DRVINFO_DEV		(nested)	device identification
> +    ETHA_DRVINFO_DRIVER		(string)	driver name
> +    ETHA_DRVINFO_VERSION	(string)	driver version
> +    ETHA_DRVINFO_FWVERSION	(string)	firmware version

FWIW I think fwinfo belongs to devlink, and should be split.  Most
modern drivers provide versions of multiple FW components smooshed into
a single string.  Perhaps it's time to allow this facility to carry
multiple key: value entries?

> +    ETHA_DRVINFO_BUSINFO	(string)	device bus address

I wonder if some of this information is also not duplicated with
sysfs.  There should be a link from the netdev to a sysfs device.
Same for driver name.  

I'm probably missing some uses (in embedded world?) and will be
corrected.. :)

> +    ETHA_DRVINFO_EROM_VER	(string)	expansion ROM version
> +    ETHA_DRVINFO_N_PRIV_FLAGS	(u32)		number of private flags
> +    ETHA_DRVINFO_N_STATS	(u32)		number of device stats
> +    ETHA_DRVINFO_TESTINFO_LEN	(u32)		number of test results
> +    ETHA_DRVINFO_EEDUMP_LEN	(u32)		EEPROM dump size
> +    ETHA_DRVINFO_REGDUMP_LEN	(u32)		register dump size