[PATCH net] ethtool: do not print warning for applications using legacy API

[PATCH net] ethtool: do not print warning for applications using legacy API

[Stephen Hemminger]

From: Stephen Hemminger <stephen@networkplumber.org>

In kernel log ths message appears on every boot:
 "warning: `NetworkChangeNo' uses legacy ethtool link settings API,
  link modes are only partially reported"

When ethtool link settings API changed, it started complaining about
usages of old API. Ironically, the original patch was from google but
the application using the legacy API is chrome.

Linux ABI is fixed as much as possible. The kernel must not break it
and should not complain about applications using legacy API's.
This patch just removes the warning since using legacy API's
in Linux is perfectly acceptable.

Fixes: 3f1ac7a700d0 ("net: ethtool: add new ETHTOOL_xLINKSETTINGS API")
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 net/core/ethtool.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index f8fcf450a36e..8225416911ae 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -770,15 +770,6 @@ static int ethtool_set_link_ksettings(struct net_device *dev,
 	return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
 }
 
-static void
-warn_incomplete_ethtool_legacy_settings_conversion(const char *details)
-{
-	char name[sizeof(current->comm)];
-
-	pr_info_once("warning: `%s' uses legacy ethtool link settings API, %s\n",
-		     get_task_comm(name, current), details);
-}
-
 /* Query device for its ethtool_cmd settings.
  *
  * Backward compatibility note: for compatibility with legacy ethtool,
@@ -805,10 +796,8 @@ static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
 							   &link_ksettings);
 		if (err < 0)
 			return err;
-		if (!convert_link_ksettings_to_legacy_settings(&cmd,
-							       &link_ksettings))
-			warn_incomplete_ethtool_legacy_settings_conversion(
-				"link modes are only partially reported");
+		convert_link_ksettings_to_legacy_settings(&cmd,
+							  &link_ksettings);
 
 		/* send a sensible cmd tag back to user */
 		cmd.cmd = ETHTOOL_GSET;
-- 
2.11.0

Re: [PATCH net] ethtool: do not print warning for applications using legacy API

[David Decotigny]

Signed-off-by: David Decotigny <decot@googlers.com>


On Fri, Dec 29, 2017 at 10:02 AM, Stephen Hemminger
<stephen@networkplumber.org> wrote:
> From: Stephen Hemminger <stephen@networkplumber.org>
>
> In kernel log ths message appears on every boot:
>  "warning: `NetworkChangeNo' uses legacy ethtool link settings API,
>   link modes are only partially reported"
>
> When ethtool link settings API changed, it started complaining about
> usages of old API. Ironically, the original patch was from google but
> the application using the legacy API is chrome.
>
> Linux ABI is fixed as much as possible. The kernel must not break it
> and should not complain about applications using legacy API's.
> This patch just removes the warning since using legacy API's
> in Linux is perfectly acceptable.
>
> Fixes: 3f1ac7a700d0 ("net: ethtool: add new ETHTOOL_xLINKSETTINGS API")
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  net/core/ethtool.c | 15 ++-------------
>  1 file changed, 2 insertions(+), 13 deletions(-)
>
> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
> index f8fcf450a36e..8225416911ae 100644
> --- a/net/core/ethtool.c
> +++ b/net/core/ethtool.c
> @@ -770,15 +770,6 @@ static int ethtool_set_link_ksettings(struct net_device *dev,
>         return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
>  }
>
> -static void
> -warn_incomplete_ethtool_legacy_settings_conversion(const char *details)
> -{
> -       char name[sizeof(current->comm)];
> -
> -       pr_info_once("warning: `%s' uses legacy ethtool link settings API, %s\n",
> -                    get_task_comm(name, current), details);
> -}
> -
>  /* Query device for its ethtool_cmd settings.
>   *
>   * Backward compatibility note: for compatibility with legacy ethtool,
> @@ -805,10 +796,8 @@ static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
>                                                            &link_ksettings);
>                 if (err < 0)
>                         return err;
> -               if (!convert_link_ksettings_to_legacy_settings(&cmd,
> -                                                              &link_ksettings))
> -                       warn_incomplete_ethtool_legacy_settings_conversion(
> -                               "link modes are only partially reported");
> +               convert_link_ksettings_to_legacy_settings(&cmd,
> +                                                         &link_ksettings);
>
>                 /* send a sensible cmd tag back to user */
>                 cmd.cmd = ETHTOOL_GSET;
> --
> 2.11.0
>

Re: [PATCH net] ethtool: do not print warning for applications using legacy API

[David Miller]

From: Stephen Hemminger <stephen@networkplumber.org>
Date: Fri, 29 Dec 2017 10:02:52 -0800

> From: Stephen Hemminger <stephen@networkplumber.org>
> 
> In kernel log ths message appears on every boot:
>  "warning: `NetworkChangeNo' uses legacy ethtool link settings API,
>   link modes are only partially reported"
> 
> When ethtool link settings API changed, it started complaining about
> usages of old API. Ironically, the original patch was from google but
> the application using the legacy API is chrome.

Chrome on my machine doesn't do this, FWIW...

> Linux ABI is fixed as much as possible. The kernel must not break it
> and should not complain about applications using legacy API's.
> This patch just removes the warning since using legacy API's
> in Linux is perfectly acceptable.
> 
> Fixes: 3f1ac7a700d0 ("net: ethtool: add new ETHTOOL_xLINKSETTINGS API")
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

Applied and queued up for -stable.

Re: [PATCH net] ethtool: do not print warning for applications using legacy API

[Stephen Hemminger]

On Tue, 02 Jan 2018 21:50:02 -0500 (EST)
David Miller <davem@davemloft.net> wrote:

> From: Stephen Hemminger <stephen@networkplumber.org>
> Date: Fri, 29 Dec 2017 10:02:52 -0800
> 
> > From: Stephen Hemminger <stephen@networkplumber.org>
> > 
> > In kernel log ths message appears on every boot:
> >  "warning: `NetworkChangeNo' uses legacy ethtool link settings API,
> >   link modes are only partially reported"
> > 
> > When ethtool link settings API changed, it started complaining about
> > usages of old API. Ironically, the original patch was from google but
> > the application using the legacy API is chrome.  
> 
> Chrome on my machine doesn't do this, FWIW...

I did report a bug to chrome team as well.