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:	Sun, 23 Nov 2014 07:00:02 -0800
From:	Roopa Prabhu <roopa@...ulusnetworks.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	jiri@...nulli.us, sfeldma@...il.com, jhs@...atatu.com,
	bcrl@...ck.org, tgraf@...g.ch, 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 11/22/14, 12:08 PM, Sergei Shtylyov wrote:
> Hello.
>
> On 11/22/2014 1:49 AM, roopa@...ulusnetworks.com wrote:
>
>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>
>> This patch adds new flags in netlink header nlmsg_flags to signal if the
>> message is for the kernel, hw or both.
>
>> This can be used to indicate hw offload for all kind of objects
>> routes, fdb entries, neighs, link objects like bonds, bridges, vxlan.
>
>> Adding it in the header makes it possible to use it accross all 
>> objects and
>> across all messages (sets/gets/deletes).
>
>> Other alternative to this is a per kernel object netlink attribute/flag.
>> But that leads to duplicating the attribute in different subsystems.
>
>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>> ---
>>   include/uapi/linux/netlink.h |    2 ++
>>   1 file changed, 2 insertions(+)
>
>> 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 */
>
>    I don't think you really meant double '+'.
certainly not.  will fix it. thanks.
>
>> +#define NLM_F_HW_OFFLOAD    64    /* offload this msg to hw */
> [...]
>
> WBR, Sergei
>
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