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virtio-net: Make tx_timer timeout configurable

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Add an option to make the TX mitigation timer adjustable as a device
option.  The 150us hard coded default used currently is reasonable,
but may not be suitable for all workloads, this gives us a way to
adjust it using a single binary.  We can't support any random option
though, so use the "x-" prefix to indicate this is a developer
option.  Usage:

-device virtio-net-pci,x-txtimer=500000,... # .5ms timeout

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Williamson 2010-09-02 09:00:50 -06:00 • committed by Michael S. Tsirkin
parent ca736c8e74
commit f0c07c7c7b
7 changed files with 27 additions and 7 deletions
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5
hw/s390-virtio-bus.c
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@ -27,6 +27,7 @@
#include "elf.h"
#include "hw/virtio.h"
#include "hw/virtio-serial.h"
#include "hw/virtio-net.h"
#include "hw/sysbus.h"
#include "kvm.h"
@ -110,7 +111,7 @@ static int s390_virtio_net_init(VirtIOS390Device *dev)
{
VirtIODevice *vdev;
vdev = virtio_net_init((DeviceState *)dev, &dev->nic);
vdev = virtio_net_init((DeviceState *)dev, &dev->nic, &dev->net);
if (!vdev) {
return -1;
}
@ -327,6 +328,8 @@ static VirtIOS390DeviceInfo s390_virtio_net = {
.qdev.size = sizeof(VirtIOS390Device),
.qdev.props = (Property[]) {
DEFINE_NIC_PROPERTIES(VirtIOS390Device, nic),
DEFINE_PROP_UINT32("x-txtimer", VirtIOS390Device,
net.txtimer, TX_TIMER_INTERVAL),
DEFINE_PROP_END_OF_LIST(),
},
};