virtio_net: Add to image.

Stress-tested in VirtualBox. No major performance or usability problems;
even when I had tracing enabled, it was transferring data at ~1.1MB/s.

build/jam/packages/Haiku

@@ -61,6 +61,7 @@ if $(TARGET_ARCH) = x86 || $(TARGET_ARCH) = x86_64 {
 AddNewDriversToPackage disk scsi	: scsi_cd scsi_disk ;
 AddNewDriversToPackage disk virtual : virtio_block ram_disk ;
 AddNewDriversToPackage power		: $(SYSTEM_ADD_ONS_DRIVERS_POWER) ;
+AddNewDriversToPackage network		: virtio_net ;
 #AddNewDriversToPackage display		: display_adapter@x86 ;
 
 # legacy drivers

src/add-ons/kernel/drivers/network/virtio/virtio_net.cpp

@@ -65,7 +65,7 @@ typedef struct {
 #include <fs/devfs.h>
 
 
-#define TRACE_VIRTIO_NET
+//#define TRACE_VIRTIO_NET
 #ifdef TRACE_VIRTIO_NET
 #	define TRACE(x...) dprintf("virtio_net: " x)
 #else
@@ -397,6 +397,10 @@ virtio_net_ioctl(void* cookie, uint32 op, void* buffer, size_t length)
 			TRACE("ioctl: add multicast\n");
 			break;
 
+		case ETHER_REMMULTI:
+			TRACE("ioctl: remove multicast\n");
+			break;
+
 		case ETHER_GET_LINK_STATE:
 		{
 			TRACE("ioctl: get link state\n");