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

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Date:	Fri, 21 Nov 2014 16:10:15 -0800
From:	Roopa Prabhu <roopa@...ulusnetworks.com>
To:	Thomas Graf <tgraf@...g.ch>
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 Mukherjee <shm@...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, 3:12 PM, Thomas Graf wrote:
> 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.

I did try to add it at a layer lower than the netlink header. But, 
nothing else fits so well as this :).
I did not find a place where i could make it a global flag for just 
networking objects. As I mention in my patch description,
If not here it will be a per subsystem flag/attribute. I can post a 
patch showing that approach as well.

Thanks!.


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