linux-kernel - Re: [PATCH net-next V3] net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)

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Date:	Fri, 15 Jul 2016 08:17:59 -0700
From:	Benjamin Poirier <benjamin.poirier@...il.com>
To:	Leon Romanovsky <leon@...nel.org>
Cc:	Netanel Belgazal <netanel@...apurnalabs.com>,
	netdev@...r.kernel.org, davem@...emloft.net,
	linux-kernel@...r.kernel.org, zorik@...apurnalabs.com,
	saeed@...apurnalabs.com, alex@...apurnalabs.com, msw@...zon.com,
	aliguori@...zon.com, ben@...adent.org.uk, romieu@...zoreil.com,
	rami.rosen@...el.com, antoine.tenart@...e-electrons.com
Subject: Re: [PATCH net-next V3] net: ena: Add a driver for Amazon Elastic
 Network Adapters (ENA)

On 2016/07/15 08:00, Leon Romanovsky wrote:
> On Thu, Jul 14, 2016 at 09:46:14AM +0300, Netanel Belgazal wrote:
> > This is a driver for the ENA family of networking devices.
> > 
> > Signed-off-by: Netanel Belgazal <netanel@...apurnalabs.com>
> > ---
> > 
> > Notes:
> 
> ...
> 
> >     - Increase driver version to 1.0.2
> 
> ...
> 
> > +static void ena_get_drvinfo(struct net_device *dev,
> > +			    struct ethtool_drvinfo *info)
> > +{
> > +	struct ena_adapter *adapter = netdev_priv(dev);
> > +
> > +	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
> > +	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
> 
> Does module version give anything valuable in real life usage?
> Do you plan to bump version after every patch?
> 
> Hint, NO.
> 
[...]
> > +
> > +#define DRV_MODULE_VER_MAJOR	1
> > +#define DRV_MODULE_VER_MINOR	0
> > +#define DRV_MODULE_VER_SUBMINOR 1
> > +
> > +#define DRV_MODULE_NAME		"ena"
> > +#ifndef DRV_MODULE_VERSION
> > +#define DRV_MODULE_VERSION \
> > +	__stringify(DRV_MODULE_VER_MAJOR) "."	\
> > +	__stringify(DRV_MODULE_VER_MINOR) "."	\
> > +	__stringify(DRV_MODULE_VER_SUBMINOR)
> > +#endif
> > +#define DRV_MODULE_RELDATE      "22-JUNE-2016"
> 
> Please remove it, driver version is useless in real life kernel usage.
> 

The release date might be a bit overkill but the driver version is
useful in the context of distribution kernels where users sometimes mix
and match newer drivers (ex: the intel sf.net drivers) with older
kernels. When a bug is reported, a quick look at the module version can
help indicate the provenance of the driver.

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