netdev - Re: [RFC PATCH 1/4] rtnetlink: new flag NLM_F_HW_OFFLOAD to indicate kernel object offload to hardware

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Message-ID: <20141121231234.GA20810@casper.infradead.org>
Date:	Fri, 21 Nov 2014 23:12:34 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	roopa@...ulusnetworks.com
Cc:	jiri@...nulli.us, sfeldma@...il.com, jhs@...atatu.com,
	bcrl@...ck.org, john.fastabend@...il.com,
	stephen@...workplumber.org, linville@...driver.com,
	nhorman@...driver.com, nicolas.dichtel@...nd.com,
	vyasevic@...hat.com, f.fainelli@...il.com, buytenh@...tstofly.org,
	aviadr@...lanox.com, netdev@...r.kernel.org, davem@...emloft.net,
	shrijeet@...ulusnetworks.com, gospo@...ulusnetworks.com
Subject: Re: [RFC PATCH 1/4] rtnetlink: new flag NLM_F_HW_OFFLOAD to indicate
 kernel object offload to hardware

On 11/21/14 at 02:49pm, roopa@...ulusnetworks.com wrote:
> diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
> index 1a85940..f78522d 100644
> --- a/include/uapi/linux/netlink.h
> +++ b/include/uapi/linux/netlink.h
> @@ -54,6 +54,8 @@ struct nlmsghdr {
>  #define NLM_F_ACK		4	/* Reply with ack, with zero or error code */
>  #define NLM_F_ECHO		8	/* Echo this request 		*/
>  #define NLM_F_DUMP_INTR		16	/* Dump was inconsistent due to sequence change */
> ++#define NLM_F_KERNEL       32      /* This msg is only for the kernel */
> +#define NLM_F_HW_OFFLOAD	64	/* offload this msg to hw */
>  
>  /* Modifiers to GET request */
>  #define NLM_F_ROOT	0x100	/* specify tree	root	*/

The NLM_F_ flag space applies to all Netlink messages including non
networking bits and is reserved for flags vital to the functioning
of the Netlink protocol itself. I suggest you move this to a
RTNETLINK specific flags space.
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