[v2,4/5] vhost: add statistics for guest notifications
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Commit Message
This patch adds a new virtqueue statistic for guest
notifications. It is useful to deduce from hypervisor side
whether the corresponding guest Virtio device is using
Kernel Virtio-net driver or DPDK Virtio PMD.
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/vhost/vhost.c | 1 +
lib/vhost/vhost.h | 5 +++++
2 files changed, 6 insertions(+)
Comments
> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Thursday, March 24, 2022 8:47 PM
> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>;
> david.marchand@redhat.com; i.maximets@ovn.org
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
> Subject: [PATCH v2 4/5] vhost: add statistics for guest notifications
>
> This patch adds a new virtqueue statistic for guest
> notifications. It is useful to deduce from hypervisor side
> whether the corresponding guest Virtio device is using
> Kernel Virtio-net driver or DPDK Virtio PMD.
>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
> lib/vhost/vhost.c | 1 +
> lib/vhost/vhost.h | 5 +++++
> 2 files changed, 6 insertions(+)
>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
@@ -42,6 +42,7 @@ static const struct vhost_vq_stats_name_off vhost_vq_stat_strings[] = {
{"size_512_1023_packets", offsetof(struct vhost_virtqueue, stats.size_bins[5])},
{"size_1024_1518_packets", offsetof(struct vhost_virtqueue, stats.size_bins[6])},
{"size_1519_max_packets", offsetof(struct vhost_virtqueue, stats.size_bins[7])},
+ {"guest_notifications", offsetof(struct vhost_virtqueue, stats.guest_notifications)},
};
#define VHOST_NB_VQ_STATS RTE_DIM(vhost_vq_stat_strings)
@@ -133,6 +133,7 @@ struct virtqueue_stats {
uint64_t broadcast;
/* Size bins in array as RFC 2819, undersized [0], 64 [1], etc */
uint64_t size_bins[8];
+ uint64_t guest_notifications;
};
/**
@@ -871,6 +872,8 @@ vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
(vq->callfd >= 0)) ||
unlikely(!signalled_used_valid)) {
eventfd_write(vq->callfd, (eventfd_t) 1);
+ if (dev->flags & VIRTIO_DEV_STATS_ENABLED)
+ vq->stats.guest_notifications++;
if (dev->notify_ops->guest_notified)
dev->notify_ops->guest_notified(dev->vid);
}
@@ -879,6 +882,8 @@ vhost_vring_call_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
&& (vq->callfd >= 0)) {
eventfd_write(vq->callfd, (eventfd_t)1);
+ if (dev->flags & VIRTIO_DEV_STATS_ENABLED)
+ vq->stats.guest_notifications++;
if (dev->notify_ops->guest_notified)
dev->notify_ops->guest_notified(dev->vid);
}