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authorToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>2018-07-23 17:36:09 +0300
committerDavid S. Miller <davem@davemloft.net>2018-07-25 22:53:37 +0300
commit461f03dc99cf6afcc3c70aaac56c4a7eee5a62bd (patch)
treee6db6cf575580055902a50ce194be0c7fa1abce2 /drivers/net/virtio_net.c
parent5b8f3c8d30a6176c6be35c6ac75e22b0a60a3c43 (diff)
downloadlinux-461f03dc99cf6afcc3c70aaac56c4a7eee5a62bd.tar.xz
virtio_net: Add kick stats
So we can infer the number of VM-Exits. Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/virtio_net.c')
-rw-r--r--drivers/net/virtio_net.c34
1 files changed, 28 insertions, 6 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index cb4ef331567c..1880c86e84b4 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -84,6 +84,7 @@ struct virtnet_sq_stats {
u64 bytes;
u64 xdp_tx;
u64 xdp_tx_drops;
+ u64 kicks;
};
struct virtnet_rq_stat_items {
@@ -94,6 +95,7 @@ struct virtnet_rq_stat_items {
u64 xdp_tx;
u64 xdp_redirects;
u64 xdp_drops;
+ u64 kicks;
};
struct virtnet_rq_stats {
@@ -117,6 +119,7 @@ static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
{ "bytes", VIRTNET_SQ_STAT(bytes) },
{ "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
{ "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
+ { "kicks", VIRTNET_SQ_STAT(kicks) },
};
static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
@@ -127,6 +130,7 @@ static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
{ "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
{ "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
{ "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
+ { "kicks", VIRTNET_RQ_STAT(kicks) },
};
#define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
@@ -507,6 +511,7 @@ static int virtnet_xdp_xmit(struct net_device *dev,
struct send_queue *sq;
unsigned int len;
int drops = 0;
+ int kicks = 0;
int ret, err;
int i;
@@ -543,12 +548,15 @@ static int virtnet_xdp_xmit(struct net_device *dev,
}
ret = n - drops;
- if (flags & XDP_XMIT_FLUSH)
- virtqueue_kick(sq->vq);
+ if (flags & XDP_XMIT_FLUSH) {
+ if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
+ kicks = 1;
+ }
out:
u64_stats_update_begin(&sq->stats.syncp);
sq->stats.xdp_tx += n;
sq->stats.xdp_tx_drops += drops;
+ sq->stats.kicks += kicks;
u64_stats_update_end(&sq->stats.syncp);
return ret;
@@ -1226,7 +1234,12 @@ static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
if (err)
break;
} while (rq->vq->num_free);
- virtqueue_kick(rq->vq);
+ if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
+ u64_stats_update_begin(&rq->stats.syncp);
+ rq->stats.items.kicks++;
+ u64_stats_update_end(&rq->stats.syncp);
+ }
+
return !oom;
}
@@ -1416,7 +1429,11 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
if (xdp_xmit & VIRTIO_XDP_TX) {
sq = virtnet_xdp_sq(vi);
- virtqueue_kick(sq->vq);
+ if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
+ u64_stats_update_begin(&sq->stats.syncp);
+ sq->stats.kicks++;
+ u64_stats_update_end(&sq->stats.syncp);
+ }
}
return received;
@@ -1578,8 +1595,13 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
}
}
- if (kick || netif_xmit_stopped(txq))
- virtqueue_kick(sq->vq);
+ if (kick || netif_xmit_stopped(txq)) {
+ if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
+ u64_stats_update_begin(&sq->stats.syncp);
+ sq->stats.kicks++;
+ u64_stats_update_end(&sq->stats.syncp);
+ }
+ }
return NETDEV_TX_OK;
}