netdev - Re: [PATCH] net: ethtool: remove error check for legacy setting transceiver type

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Date:   Thu, 19 Oct 2017 16:38:02 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Renjith R V <renjith.rv@...st-global.com>
Subject: Re: [PATCH] net: ethtool: remove error check for legacy setting
 transceiver type

On 10/19/2017 04:32 PM, Niklas Söderlund wrote:
> Commit 9cab88726929605 ("net: ethtool: Add back transceiver type")
> restores the transceiver type to struct ethtool_link_settings and
> convert_link_ksettings_to_legacy_settings() but forgets to remove the
> error check for the same in convert_legacy_settings_to_link_ksettings().
> This prevents older versions of ethtool to change link settings.
> 
>     # ethtool --version
>     ethtool version 3.16
> 
>     # ethtool -s eth0 autoneg on speed 100 duplex full
>     Cannot set new settings: Invalid argument
>       not setting speed
>       not setting duplex
>       not setting autoneg
> 
> While newer versions of ethtool works.
> 
>     # ethtool --version
>     ethtool version 4.10
> 
>     # ethtool -s eth0 autoneg on speed 100 duplex full
>     [   57.703268] sh-eth ee700000.ethernet eth0: Link is Down
>     [   59.618227] sh-eth ee700000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
> 
> Fixes: 19cab88726929605 ("net: ethtool: Add back transceiver type")
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Good catch, thanks Niklas! Surprisingly I was also testing with an older
version of ethtool but I realize I was mostly testing the "get" part and
not the "set" part, so clearly an oversight here...

Acked-by: Florian Fainelli <f.fainelli@...il.com>

> ---
>  net/core/ethtool.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> Hi,
> 
> The commit 9cab88726929605 ("net: ethtool: Add back transceiver type") 
> itself is not enough to trigger the error, the commit after it is also 
> needed ceb628134a75564d ("net: phy: Keep reporting transceiver type").
> This is because the later sets cmd->base.transceiver so that the type 
> can be reported and the fault triggered. I hope however I did the 
> correct thing with the Fixes tag.

Both having made it in the same release, that should be fine, thanks!

> 
> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
> index 3228411ada0fa77e..9a9a3d77e3274fc3 100644
> --- a/net/core/ethtool.c
> +++ b/net/core/ethtool.c
> @@ -436,7 +436,7 @@ bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
>  EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);
>  
>  /* return false if legacy contained non-0 deprecated fields
> - * transceiver/maxtxpkt/maxrxpkt. rest of ksettings always updated
> + * maxtxpkt/maxrxpkt. rest of ksettings always updated
>   */
>  static bool
>  convert_legacy_settings_to_link_ksettings(
> @@ -451,8 +451,7 @@ convert_legacy_settings_to_link_ksettings(
>  	 * deprecated legacy fields, and they should not use
>  	 * %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
>  	 */
> -	if (legacy_settings->transceiver ||
> -	    legacy_settings->maxtxpkt ||
> +	if (legacy_settings->maxtxpkt ||
>  	    legacy_settings->maxrxpkt)
>  		retval = false;
>  
> 


-- 
Florian