netdev - Re: [PATCH V2 05/12] net: Add ndo_set_vif_param operation to serve eIPoIB VIFs

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Date:	Thu, 2 Aug 2012 01:17:02 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Or Gerlitz <ogerlitz@...lanox.com>
CC:	<davem@...emloft.net>, <roland@...nel.org>,
	<netdev@...r.kernel.org>, <ali@...lanox.com>,
	<sean.hefty@...el.com>, Erez Shitrit <erezsh@...lanox.co.il>
Subject: Re: [PATCH V2 05/12] net: Add ndo_set_vif_param operation to serve
 eIPoIB VIFs

On Wed, 2012-08-01 at 20:09 +0300, Or Gerlitz wrote:
> From: Erez Shitrit <erezsh@...lanox.co.il>
> 
> The Ethernet IPoIB driver enslaves IPoIB devices and uses them as
> VIFs (Virtual Interface) which serve an Ethernet NIC e.g present in a 
> guest OS. For each such slave that acts as a VIF, eIPoIB needs to know 
> the mac and optionally the vlan uses by that NIC, the new ndo opertaion 
> is used to associate the mac/vlan for that slave.
> 
> Signed-off-by: Erez Shitrit <erezsh@...lanox.co.il>
> Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
> ---
>  include/linux/netdevice.h |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index eb06e58..2709551 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1013,7 +1013,10 @@ struct net_device_ops {
>  						    netdev_features_t features);
>  	int			(*ndo_neigh_construct)(struct neighbour *n);
>  	void			(*ndo_neigh_destroy)(struct neighbour *n);
> -
> +	int			(*ndo_set_vif_param) (struct net_device *dev,
> +						      struct net_device *vif,
> +						      u16 vlan,
> +						      u8 *mac);

The semantics of this operation should be documented in the comment
above the structure definition.  One detail worth covering is whether
'vlan' is just a VID or can also include priority+CFI bits.

If this is specific to eIPoIB, why not put that in the name of the
operation?  If not, this *really* needs explaining because so far I have
no whether it is something I should consider implementing on a real
Ethernet device.

Ben.

>  	int			(*ndo_fdb_add)(struct ndmsg *ndm,
>  					       struct net_device *dev,
>  					       unsigned char *addr,

-- 
Ben Hutchings, Staff Engineer, Solarflare
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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