netdev - Re: [PATCH net-next V6 7/8] net/dcb: Add an optional max rate attribute

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Date:	Wed, 04 Apr 2012 08:48:12 -0700
From:	John Fastabend <john.r.fastabend@...el.com>
To:	Amir Vadai <amirv@...lanox.com>
CC:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Roland Dreier <roland@...estorage.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Oren Duer <oren@...lanox.com>,
	Amir Vadai <amirv@....mellanox.co.il>
Subject: Re: [PATCH net-next V6 7/8] net/dcb: Add an optional max rate attribute

On 4/4/2012 3:58 AM, Amir Vadai wrote:
> Although not specified in 8021Qaz spec, it could be useful to enable drivers
> whose HW supports setting a rate limit for an ETS TC. This patch adds this
> optional attribute to DCB netlink. To use it, drivers should implement and
> register the callbacks ieee_setmaxrate and ieee_getmaxrate. The units are 64
> bits long and specified in Kbps to enable usage over both slow and very fast
> networks.
> 
> Signed-off-by: Amir Vadai <amirv@...lanox.com>
> ---
>  include/linux/dcbnl.h |    5 +++++
>  include/net/dcbnl.h   |    2 ++
>  net/dcb/dcbnl.c       |   21 +++++++++++++++++++++
>  3 files changed, 28 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/dcbnl.h b/include/linux/dcbnl.h
> index 65a2562..ec8e372 100644
> --- a/include/linux/dcbnl.h
> +++ b/include/linux/dcbnl.h
> @@ -67,6 +67,10 @@ struct ieee_ets {
>  	__u8	reco_prio_tc[IEEE_8021QAZ_MAX_TCS];
>  };
>  
> +struct ieee_maxrate {
> +	__u64	tc_maxrate[IEEE_8021QAZ_MAX_TCS];
> +};
> +

And I think the last comment. We really should have a comment here describing
what the tc_maxrate field is. Its described in the commit log but its much
harder for implementers to get it wrong when the struct is annotated.

Thanks!
John
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