netdev - Re: [net-next PATCH v1 1/3] net: sched: af_packet support for direct ring access

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Date:	Mon, 06 Oct 2014 21:25:12 -0700
From:	John Fastabend <john.r.fastabend@...el.com>
To:	David Miller <davem@...emloft.net>, john.fastabend@...il.com
CC:	dborkman@...hat.com, fw@...len.de, gerlitz.or@...il.com,
	hannes@...essinduktion.org, netdev@...r.kernel.org,
	john.ronciak@...el.com, amirv@...lanox.com, eric.dumazet@...il.com,
	danny.zhou@...el.com
Subject: Re: [net-next PATCH v1 1/3] net: sched: af_packet support for direct
 ring access

On 10/06/2014 02:42 PM, David Miller wrote:
> From: John Fastabend <john.fastabend@...il.com>
> Date: Sun, 05 Oct 2014 17:06:31 -0700
> 
>> This patch adds a net_device ops to split off a set of driver queues
>> from the driver and map the queues into user space via mmap. This
>> allows the queues to be directly manipulated from user space. For
>> raw packet interface this removes any overhead from the kernel network
>> stack.
> 
> About the facility in general, I am generally in favor, as I expressed
> at the networking track in Chiacgo.
> 
> But you missed the mark wrt. describing the descriptors.
> 
> I do not want you to give device IDs.
> 
> I want the code to be %100 agnostic to device or vendor IDs.
> 

OK. I'll work on this and have a v2 after net-next opens again.

Thanks!

> Really "describe" the descriptor.  Not just how large is it (32-bits,
> 64-bits, etc.), but also: 1) is it little or big endian 2) where is
> the length field 3) where is control bit "foo" located, etc.
> 
> That's what I want to see in "struct tpacket_dev_info", rather than
> device IDs and "versions".
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