net: Adding netmap network backend

This patch adds support for a network backend based on netmap.
netmap is a framework for high speed packet I/O. You can use it
to build extremely fast traffic generators, monitors, software
switches or network middleboxes. Its companion software switch
VALE lets you interconnect virtual machines.
netmap and VALE are implemented as a non-intrusive kernel module,
support NICs from multiple vendors, are part of standard FreeBSD
distributions and available in source format for Linux too.

To compile QEMU with netmap support, use the following configure
options:
    ./configure [...] --enable-netmap --extra-cflags=-I/path/to/netmap/sys
where "/path/to/netmap" contains the netmap source code, available at
    http://info.iet.unipi.it/~luigi/netmap/

The same webpage contains more information about the netmap project
(together with papers and presentations).

Signed-off-by: Vincenzo Maffione <v.maffione@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/net.c b/net/net.c
index 0a88e68..ae8e5e5 100644
--- a/net/net.c
+++ b/net/net.c
@@ -726,6 +726,9 @@ static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
 #ifdef CONFIG_VDE
         [NET_CLIENT_OPTIONS_KIND_VDE]       = net_init_vde,
 #endif
+#ifdef CONFIG_NETMAP
+        [NET_CLIENT_OPTIONS_KIND_NETMAP]    = net_init_netmap,
+#endif
         [NET_CLIENT_OPTIONS_KIND_DUMP]      = net_init_dump,
 #ifdef CONFIG_NET_BRIDGE
         [NET_CLIENT_OPTIONS_KIND_BRIDGE]    = net_init_bridge,
@@ -757,6 +760,9 @@ static int net_client_init1(const void *object, int is_netdev, Error **errp)
 #ifdef CONFIG_VDE
         case NET_CLIENT_OPTIONS_KIND_VDE:
 #endif
+#ifdef CONFIG_NETMAP
+        case NET_CLIENT_OPTIONS_KIND_NETMAP:
+#endif
 #ifdef CONFIG_NET_BRIDGE
         case NET_CLIENT_OPTIONS_KIND_BRIDGE:
 #endif