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virtio_net: Add kick stats

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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>
This commit is contained in:
Toshiaki Makita 2018-07-23 23:36:09 +09:00 committed by David S. Miller
parent 5b8f3c8d30
commit 461f03dc99
1 changed files with 28 additions and 6 deletions
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34
drivers/net/virtio_net.c
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@ -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;
}