netdev - Re: user-to-kernel shared memory with net

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Message-ID: <3dc384f905c5638e888cf070440c987f@chewa.net>
Date:	Tue, 20 Oct 2009 08:47:56 +0200
From:	Rémi Denis-Courmont <remi@...lab.net>
To:	Chris Ross <chris@...pilednetworks.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: user-to-kernel shared memory with net_device


On Mon, 19 Oct 2009 16:28:42 -0500, Chris Ross <chris@...pilednetworks.com>
wrote:
> All of the mmap examples I can find seem to be for character devices.
> Do I need a character device that implements mmap and proxies access
> to the net_device's stats, or is there a way to mmap directly to a
> net_device structure? Also, is this the excepted method when a
> userspace process needs to read large tables from a driver?

You cannot use mmap() directly on a network device as there are no file
descriptors to network devices. In principle, you can still initiate a
memory mapping using a network device ioctl(), but this is probably not
such a great idea.

-- 
Rémi Denis-Courmont

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