[PATCH RFC net-next 1/2] drivers: net: virtio_net: Add tx_timeout stats field

[jcfaracco@gmail.com]

From: Julio Faracco <jcfaracco@gmail.com>

For debug purpose of TX timeout events, a tx_timeout entry was added to
monitor this special case: when dev_watchdog identifies a tx_timeout and
throw an exception. We can both consider this event as an error, but
driver should report as a tx_timeout statistic.

Signed-off-by: Julio Faracco <jcfaracco@gmail.com>
Signed-off-by: Daiane Mendes <dnmendes76@gmail.com>
Cc: Jason Wang <jasowang@redhat.com>
---
 drivers/net/virtio_net.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 4f3de0ac8b0b..27f9b212c9f5 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -75,6 +75,7 @@ struct virtnet_sq_stats {
 	u64 xdp_tx;
 	u64 xdp_tx_drops;
 	u64 kicks;
+	u64 tx_timeouts;
 };
 
 struct virtnet_rq_stats {
@@ -98,6 +99,7 @@ static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
 	{ "xdp_tx",		VIRTNET_SQ_STAT(xdp_tx) },
 	{ "xdp_tx_drops",	VIRTNET_SQ_STAT(xdp_tx_drops) },
 	{ "kicks",		VIRTNET_SQ_STAT(kicks) },
+	{ "tx_timeouts",	VIRTNET_SQ_STAT(tx_timeouts) },
 };
 
 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
@@ -1721,7 +1723,7 @@ static void virtnet_stats(struct net_device *dev,
 	int i;
 
 	for (i = 0; i < vi->max_queue_pairs; i++) {
-		u64 tpackets, tbytes, rpackets, rbytes, rdrops;
+		u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops;
 		struct receive_queue *rq = &vi->rq[i];
 		struct send_queue *sq = &vi->sq[i];
 
@@ -1729,6 +1731,7 @@ static void virtnet_stats(struct net_device *dev,
 			start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
 			tpackets = sq->stats.packets;
 			tbytes   = sq->stats.bytes;
+			terrors  = sq->stats.tx_timeouts;
 		} while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
 
 		do {
@@ -1743,6 +1746,7 @@ static void virtnet_stats(struct net_device *dev,
 		tot->rx_bytes   += rbytes;
 		tot->tx_bytes   += tbytes;
 		tot->rx_dropped += rdrops;
+		tot->tx_errors  += terrors;
 	}
 
 	tot->tx_dropped = dev->stats.tx_dropped;
-- 
2.21.0