vhost: add statistics for IOTLB

This patch adds statistics for IOTLB hits and misses.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

diff --git a/lib/vhost/vhost.c b/lib/vhost/vhost.c
index 1814599aafccd81e6f3bffb8445d8e2eb058fab2..42e4b8a1276a457a513905e47aff16ca8506a56b 100644 (file)
--- a/lib/vhost/vhost.c
+++ b/lib/vhost/vhost.c
@@ -43,6 +43,8 @@ static const struct vhost_vq_stats_name_off vhost_vq_stat_strings[] = {
        {"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)},
+       {"iotlb_hits",             offsetof(struct vhost_virtqueue, stats.iotlb_hits)},
+       {"iotlb_misses",           offsetof(struct vhost_virtqueue, stats.iotlb_misses)},
 };
 
 #define VHOST_NB_VQ_STATS RTE_DIM(vhost_vq_stat_strings)
@@ -60,8 +62,14 @@ __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
        tmp_size = *size;
 
        vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
-       if (tmp_size == *size)
+       if (tmp_size == *size) {
+               if (dev->flags & VIRTIO_DEV_STATS_ENABLED)
+                       vq->stats.iotlb_hits++;
                return vva;
+       }
+
+       if (dev->flags & VIRTIO_DEV_STATS_ENABLED)
+               vq->stats.iotlb_misses++;
 
        iova += tmp_size;
 

diff --git a/lib/vhost/vhost.h b/lib/vhost/vhost.h
index 13c5c2266defcdc86d20f6754f77fd5fee728477..872675207e3e091035a62e90f2efcf248d8c6e80 100644 (file)
--- a/lib/vhost/vhost.h
+++ b/lib/vhost/vhost.h
@@ -134,6 +134,8 @@ struct virtqueue_stats {
        /* Size bins in array as RFC 2819, undersized [0], 64 [1], etc */
        uint64_t size_bins[8];
        uint64_t guest_notifications;
+       uint64_t iotlb_hits;
+       uint64_t iotlb_misses;
 };
 
 /**