On 11/28/2013 08:24 PM, Ben Pfaff wrote:
On Wed, Nov 27, 2013 at 11:51:20PM +0100, Thomas Graf wrote:
On 11/26/2013 12:02 AM, Ben Pfaff wrote:
On Thu, Nov 21, 2013 at 07:16:54PM +0100, Thomas Graf wrote:
Based on the initial patch by Cong Wang posted a couple of months
ago.
This is the user space counterpart needed for the kernel patch
'[PATCH net-next 3/8] openvswitch: Enable memory mapped Netlink i/o'
Allows the kernel to construct Netlink messages on memory mapped
buffers and thus avoids copying. The functionality is enabled on
sockets used for unicast traffic.
Further optimizations are possible by avoiding the copy into the
ofpbuf after reading.
Cc: Cong Wang <xiyou.wangc...@gmail.com>
Signed-off-by: Thomas Graf <tg...@redhat.com>
Does this depend on other patches or some specific Linux kernel
headers? It doesn't build here on GCC (similar results with Clang):
Yes, it depends on a sufficiently recent <linux/netlink.h>. We can
either #ifdef the mmap code or we provide a local copy of
<linux/netlink.h> in include/linux. The code automatically falls back if
the kernel does not support NL MMAP so that seems superior.
Can you add the new definitions to the end of lib/netlink-protocol.h,
conditional on their being needed? We already have a number of
compatibility definitions there.
Sure. I'll move the definitions out of !HAVE_NETLINK and into
appropriate conditionals.
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