netdev - Re: [PATCH V2 08/12] net/eipoib: Add ethtool file support

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Message-ID: <1343922160.2639.4.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Thu, 2 Aug 2012 16:42:40 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Erez Shitrit <erezsh@...lanox.com>
CC:	Or Gerlitz <ogerlitz@...lanox.com>, <davem@...emloft.net>,
	<roland@...nel.org>, <netdev@...r.kernel.org>, <ali@...lanox.com>,
	<sean.hefty@...el.com>, Erez Shitrit <erezsh@...lanox.co.il>
Subject: Re: [PATCH V2 08/12] net/eipoib: Add ethtool file support

On Thu, 2012-08-02 at 11:35 +0300, Erez Shitrit wrote:
> On 8/2/2012 3:22 AM, Ben Hutchings wrote:
> > On Wed, 2012-08-01 at 20:09 +0300, Or Gerlitz wrote:
> >> From: Erez Shitrit <erezsh@...lanox.co.il>
> >>
> >> Via ethtool the driver describes its version, ABI version, on what PIF
> >> interface it runs and various statistics.
> > [...]
> >> --- /dev/null
> >> +++ b/drivers/net/eipoib/eth_ipoib_ethtool.c
> > [...]
> >> +static void parent_ethtool_get_drvinfo(struct net_device *parent_dev,
> >> +				       struct ethtool_drvinfo *drvinfo)
> >> +{
> >> +	struct parent *parent = netdev_priv(parent_dev);
> >> +
> >> +	strncpy(drvinfo->driver, DRV_NAME, 32);
> >> +
> >> +	strncpy(drvinfo->version, DRV_VERSION, 32);
> >> +
> >> +	strncpy(drvinfo->bus_info, parent->ipoib_main_interface,
> >> +		ETHTOOL_BUSINFO_LEN);
> > These must be null-terminated; therefore use strlcpy().
> 
> ok, will fix.
> 
> >> +	/* indicates ABI version */
> >> +	snprintf(drvinfo->fw_version, 32, "%d", EIPOIB_ABI_VER);
> > [...]
> >
> > This is an abuse of fw_version.
> >
> > Ben.
> we took the idea from the bonding driver,
> (snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);)

The bonding driver has lots of warts.

> Do you have any idea where can we keep the abi version?

You don't need to, because David will insist that you will only change
the ABI in a backward-compatible way. :-)

(The bonding ABI version hasn't changed since Linux 2.6.3, and even then
it provided backward compatibility.)

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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