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virtio_ring: change host notification API

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Currently a host kick error is silently ignored and not reflected in
the virtqueue of a particular virtio device.

Changing the notify API for guest->host notification seems to be one
prerequisite in order to be able to handle such errors in the context
where the kick is triggered.

This patch changes the notify API. The notify function must return a
bool return value. It returns false if the host notification failed.

Signed-off-by: Heinz Graalfs <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Heinz Graalfs 2013-10-29 09:38:50 +10:30 • committed by Rusty Russell
commit 46f9c2b925
10 changed files with 32 additions and 15 deletions
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3
tools/virtio/virtio_test.c
View file

@ -41,13 +41,14 @@ struct vdev_info {
struct vhost_memory *mem;
};
void vq_notify(struct virtqueue *vq)
bool vq_notify(struct virtqueue *vq)
{
struct vq_info *info = vq->priv;
unsigned long long v = 1;
int r;
r = write(info->kick, &v, sizeof v);
assert(r == sizeof v);
return true;
}
void vq_callback(struct virtqueue *vq)

13
tools/virtio/vringh_test.c
View file

@ -22,7 +22,7 @@ static u64 user_addr_offset;
#define RINGSIZE 256
#define ALIGN 4096
static void never_notify_host(struct virtqueue *vq)
static bool never_notify_host(struct virtqueue *vq)
{
abort();
}
@ -65,17 +65,22 @@ struct guest_virtio_device {
unsigned long notifies;
};
static void parallel_notify_host(struct virtqueue *vq)
static bool parallel_notify_host(struct virtqueue *vq)
{
int rc;
struct guest_virtio_device *gvdev;
gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev);
write(gvdev->to_host_fd, "", 1);
rc = write(gvdev->to_host_fd, "", 1);
if (rc < 0)
return false;
gvdev->notifies++;
return true;
}
static void no_notify_host(struct virtqueue *vq)
static bool no_notify_host(struct virtqueue *vq)
{
return true;
}
#define NUM_XFERS (10000000)