netdev - Re: [PATCH v2] bond: add support to read speed and duplex via ethtool

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Date:	Wed, 17 Apr 2013 02:33:02 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Andy Gospodarek <andy@...yhouse.net>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH v2] bond: add support to read speed and duplex via ethtool

Hello.

On 04/17/2013 01:10 AM, Andy Gospodarek wrote:

> This patch adds support for the get_settings ethtool op to the bonding
> driver.  This was motivated by users who wanted to get the speed of the
> bond and compare that against throughput to understand utilization.
> The behavior before this patch was added was problematic when computing
> line utilization after trying to get link-speed and throughput via SNMP.
>
> Output from ethtool looks like this for a round-robin bond:
>
> Settings for bond0:
> 	Supported ports: [ ]
> 	Supported link modes:   Not reported
> 	Supported pause frame use: No
> 	Supports auto-negotiation: No
> 	Advertised link modes:  Not reported
> 	Advertised pause frame use: No
> 	Advertised auto-negotiation: No
> 	Speed: 11000Mb/s
> 	Duplex: Full
> 	Port: Other
> 	PHYAD: 0
> 	Transceiver: internal
> 	Auto-negotiation: off
> 	MDI-X: Unknown
> 	Link detected: yes
>
> I tested this and verified it works as expected.  A test was also done
> on a version backported to an older kernel and it worked well there.
>
> v2: switch to using ethtool_cmd_speed_set to set speed, added check to
> SLAVE_IS_OK for each slave in bond, dropped mode-specific calculations
> as they were not needed, and set port type to 'Other.'
>
> Signed-off-by: Andy Gospodarek <andy@...yhouse.net>
> ---
>   drivers/net/bonding/bond_main.c | 34 ++++++++++++++++++++++++++++++++++
>   1 file changed, 34 insertions(+)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 07401a3..da2dd38 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -4222,6 +4222,39 @@ void bond_set_mode_ops(struct bonding *bond, int mode)
>   	}
>   }
>   
> +static int bond_ethtool_get_settings(struct net_device *bond_dev,
> +				     struct ethtool_cmd *ecmd)
> +{
[...]
> +			if (slave->speed != SPEED_UNKNOWN) {
> +				speed += slave->speed;
> +			}

    {} not needed. scripts/checkpatch.pl should have probably complained.

WBR, Sergei

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