Xen devel - Aug 2010 - [GIT/PATCH 0/2] Minor fixes to xen-netfront

I think these are likely for 2.6.37 but if possible the ethtool one
would be nice to have for 2.6.36 since 2.6.36 adds PVHVM support for Xen
(paravirtual drivers for fully-virtualised guests) so it is useful to be
able to see explicitly if eth0 is emulated or PV without having to infer
xen-netfront from:
        # ethtool -i eth0
        Cannot get driver information: Operation not supported

The following changes since commit da5cabf80e2433131bf0ed8993abc0f7ea618c73:
  Linus Torvalds (1):
        Linux 2.6.36-rc1

are available in the git repository at:

  git://xenbits.xensource.com/people/ianc/linux-2.6.git for-netdev/xen-netfront

Ian Campbell (2):
      xen: use less generic names in netfront driver.
      xen: netfront: support the ethtool drvinfo hook.

 drivers/net/xen-netfront.c |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

Ian.



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All Xen frontend drivers have a couple of identically named functions which
makes figuring out which device went wrong from a stacktrace harder than it
needs to be. Rename them to something specificto the device type.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
 drivers/net/xen-netfront.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index b50fedc..788a9bc 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1395,7 +1395,7 @@ static int setup_netfront(struct xenbus_device *dev,
struct netfront_info *info)
 }
 
 /* Common code used when first setting up, and when resuming. */
-static int talk_to_backend(struct xenbus_device *dev,
+static int talk_to_netback(struct xenbus_device *dev,
 			   struct netfront_info *info)
 {
 	const char *message;
@@ -1545,7 +1545,7 @@ static int xennet_connect(struct net_device *dev)
 		return -ENODEV;
 	}
 
-	err = talk_to_backend(np->xbdev, np);
+	err = talk_to_netback(np->xbdev, np);
 	if (err)
 		return err;
 
@@ -1599,7 +1599,7 @@ static int xennet_connect(struct net_device *dev)
 /**
  * Callback received when the backend''s state changes.
  */
-static void backend_changed(struct xenbus_device *dev,
+static void netback_changed(struct xenbus_device *dev,
 			    enum xenbus_state backend_state)
 {
 	struct netfront_info *np = dev_get_drvdata(&dev->dev);
@@ -1801,7 +1801,7 @@ static struct xenbus_driver netfront_driver = {
 	.probe = netfront_probe,
 	.remove = __devexit_p(xennet_remove),
 	.resume = netfront_resume,
-	.otherend_changed = backend_changed,
+	.otherend_changed = netback_changed,
 };
 
 static int __init netif_init(void)
-- 
1.5.6.5


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Causes "ethtool -i" to report something useful:
	# ethtool -i eth0
	driver: xen-netfront
	version:
	firmware-version:
	bus-info: vif-0

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
---
 drivers/net/xen-netfront.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 788a9bc..4484929 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1630,8 +1630,17 @@ static void netback_changed(struct xenbus_device *dev,
 	}
 }
 
+static void xennet_get_drvinfo(struct net_device *dev,
+			       struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, "xen-netfront");
+	strcpy(info->bus_info, dev_name(dev->dev.parent));
+}
+
 static const struct ethtool_ops xennet_ethtool_ops  {
+	.get_drvinfo = xennet_get_drvinfo,
+
 	.set_tx_csum = ethtool_op_set_tx_csum,
 	.set_sg = xennet_set_sg,
 	.set_tso = xennet_set_tso,
-- 
1.5.6.5


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On Thu, 2010-08-19 at 10:27 +0100, Ian Campbell wrote:
> Causes "ethtool -i" to report something useful:
> 	# ethtool -i eth0
> 	driver: xen-netfront
> 	version:
> 	firmware-version:
> 	bus-info: vif-0
[...]

This should already be covered by:

commit 01414802054c382072b6cb9a1bdc6e243c74b2d5
Author: Ben Hutchings <bhutchings@solarflare.com>
Date:   Tue Aug 17 02:31:15 2010 -0700

    ethtool: Provide a default implementation of ethtool_ops::get_drvinfo

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
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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On Fri, 2010-08-20 at 01:51 +0100, Ben Hutchings wrote:
> On Thu, 2010-08-19 at 10:27 +0100, Ian Campbell wrote:
> > Causes "ethtool -i" to report something useful:
> > 	# ethtool -i eth0
> > 	driver: xen-netfront
> > 	version:
> > 	firmware-version:
> > 	bus-info: vif-0
> [...]
> 
> This should already be covered by:
> 
> commit 01414802054c382072b6cb9a1bdc6e243c74b2d5
Excellent, thanks!
> Author: Ben Hutchings <bhutchings@solarflare.com>
> Date:   Tue Aug 17 02:31:15 2010 -0700
> 
>     ethtool: Provide a default implementation of ethtool_ops::get_drvinfo
> 
> Ben.
> 


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From: Ian Campbell <ian.campbell@citrix.com>
Date: Thu, 19 Aug 2010 10:27:49 +0100
> All Xen frontend drivers have a couple of identically named functions which
> makes figuring out which device went wrong from a stacktrace harder than it
> needs to be. Rename them to something specificto the device type.
> 
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
> Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Applied.

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