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Message-ID: <20240130142521.18593-1-danielj@nvidia.com>
Date: Tue, 30 Jan 2024 08:25:21 -0600
From: Daniel Jurgens <danielj@...dia.com>
To: <netdev@...r.kernel.org>
CC: <mst@...hat.com>, <jasowang@...hat.com>, <xuanzhuo@...ux.alibaba.com>,
<virtualization@...ts.linux.dev>, <davem@...emloft.net>,
<edumazet@...gle.com>, <kuba@...nel.org>, <abeni@...hat.com>, Daniel Jurgens
<danielj@...dia.com>, Parav Pandit <parav@...dia.com>
Subject: [PATCH net-next] virtio_net: Add TX stop and wake counters
Add a tx queue stop and wake counters, they are useful for debugging.
$ ethtool -S ens5f2 | grep 'tx_stop\|tx_wake'
...
tx_queue_1_tx_stop: 16726
tx_queue_1_tx_wake: 16726
...
tx_queue_8_tx_stop: 1500110
tx_queue_8_tx_wake: 1500110
Signed-off-by: Daniel Jurgens <danielj@...dia.com>
Reviewed-by: Parav Pandit <parav@...dia.com>
---
drivers/net/virtio_net.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 3cb8aa193884..7e3c31ceaf7e 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -88,6 +88,8 @@ struct virtnet_sq_stats {
u64_stats_t xdp_tx_drops;
u64_stats_t kicks;
u64_stats_t tx_timeouts;
+ u64_stats_t tx_stop;
+ u64_stats_t tx_wake;
};
struct virtnet_rq_stats {
@@ -112,6 +114,8 @@ static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
{ "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
{ "kicks", VIRTNET_SQ_STAT(kicks) },
{ "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) },
+ { "tx_stop", VIRTNET_SQ_STAT(tx_stop) },
+ { "tx_wake", VIRTNET_SQ_STAT(tx_wake) },
};
static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
@@ -843,6 +847,9 @@ static void check_sq_full_and_disable(struct virtnet_info *vi,
*/
if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
netif_stop_subqueue(dev, qnum);
+ u64_stats_update_begin(&sq->stats.syncp);
+ u64_stats_inc(&sq->stats.tx_stop);
+ u64_stats_update_end(&sq->stats.syncp);
if (use_napi) {
if (unlikely(!virtqueue_enable_cb_delayed(sq->vq)))
virtqueue_napi_schedule(&sq->napi, sq->vq);
@@ -851,6 +858,9 @@ static void check_sq_full_and_disable(struct virtnet_info *vi,
free_old_xmit_skbs(sq, false);
if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
netif_start_subqueue(dev, qnum);
+ u64_stats_update_begin(&sq->stats.syncp);
+ u64_stats_inc(&sq->stats.tx_wake);
+ u64_stats_update_end(&sq->stats.syncp);
virtqueue_disable_cb(sq->vq);
}
}
@@ -2163,8 +2173,14 @@ static void virtnet_poll_cleantx(struct receive_queue *rq)
free_old_xmit_skbs(sq, true);
} while (unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
- if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
+ if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
+ if (netif_tx_queue_stopped(txq)) {
+ u64_stats_update_begin(&sq->stats.syncp);
+ u64_stats_inc(&sq->stats.tx_wake);
+ u64_stats_update_end(&sq->stats.syncp);
+ }
netif_tx_wake_queue(txq);
+ }
__netif_tx_unlock(txq);
}
@@ -2310,8 +2326,14 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
virtqueue_disable_cb(sq->vq);
free_old_xmit_skbs(sq, true);
- if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
+ if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
+ if (netif_tx_queue_stopped(txq)) {
+ u64_stats_update_begin(&sq->stats.syncp);
+ u64_stats_inc(&sq->stats.tx_wake);
+ u64_stats_update_end(&sq->stats.syncp);
+ }
netif_tx_wake_queue(txq);
+ }
opaque = virtqueue_enable_cb_prepare(sq->vq);
--
2.42.0
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