netdev - Re: [PATCH net-next 06/10] {NET,IB}/mlx4: Add device managed flow steering firmware API

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Date:	Sun, 1 Jul 2012 15:29:41 +0300
From:	Or Gerlitz <ogerlitz@...lanox.com>
To:	David Miller <davem@...emloft.net>
CC:	<roland@...nel.org>, <yevgenyp@...lanox.com>, <oren@...lanox.com>,
	<netdev@...r.kernel.org>, <hadarh@...lanox.co.il>
Subject: Re: [PATCH net-next 06/10] {NET,IB}/mlx4: Add device managed flow
 steering firmware API

On 7/1/2012 1:30 PM, David Miller wrote:
[...]
> @@ -136,6 +138,11 @@ module_param_array(port_type_array, int, &arr_argc, 0444);
>   MODULE_PARM_DESC(port_type_array, "Array of port types: HW_DEFAULT (0) is default "
>   				"1 for IB, 2 for Ethernet");
>   
> +static int mlx4_flow_steering_hash;
> +module_param_named(flow_steering_hash, mlx4_flow_steering_hash, int, 0444);
> +MODULE_PARM_DESC(flow_steering_hash,
> +		 "Flow steering hash function configuration. Config options: L2 = 0, L2_L3_L4 = 1 (default: L2).");
> +
>
> No module paramters, do it via ethtool or similar.
>

Dave,

We'll be handling the indentation, comments and other syntax issues you 
have pointed out
and submit V1, hopefully which would be clean from such errors.

Re the usage of the module param - as was pointed out in the change-log, 
please note that
this policy is **global** to the HCA, that is effects all the Ethernet 
(and down the road,
also IPoIB flow-steering, when we run a card with one IB port and one 
Eth port) net-devices
that relate to that device.

The module param is for mlx4_core and not for mlx4_en. In that respect, 
per net-device
ethtool directive wouldn't work, even when there is a dedicated firmware 
command that
allows changing this in run-time, which we don't have now.

My thinking was that once we have this command at hand, we can add 
sysfs/etc entry at
the mlx4_core level to provide a different hash function to the device. 
And for the
time being use the module param, makes sense?

Or.
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