[PATCH v2 net-next 16/26] virtio_net: don't mix XDP_DROP counter with Rx XDP errors

[Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>]

Dedicate a separate counter for tracking XDP_ABORTED and other XDP
errors and to leave xdp_drop for XDP_DROP case solely.
Needed to better align with generic XDP stats.

Signed-off-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx>
---
 drivers/net/virtio_net.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index c74af526d79b..112ceda3dcf7 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -92,6 +92,7 @@ struct virtnet_rq_stats {
 	u64 xdp_tx;
 	u64 xdp_redirects;
 	u64 xdp_drops;
+	u64 xdp_errors;
 	u64 kicks;
 };

@@ -115,6 +116,7 @@ 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) },
+	{ "xdp_errors",		VIRTNET_RQ_STAT(xdp_errors) },
 	{ "kicks",		VIRTNET_RQ_STAT(kicks) },
 };

@@ -818,7 +820,8 @@ static struct sk_buff *receive_small(struct net_device *dev,
 			trace_xdp_exception(vi->dev, xdp_prog, act);
 			goto err_xdp;
 		case XDP_DROP:
-			goto err_xdp;
+			stats->xdp_drops++;
+			goto xdp_drop;
 		}
 	}
 	rcu_read_unlock();
@@ -843,8 +846,9 @@ static struct sk_buff *receive_small(struct net_device *dev,
 	return skb;

 err_xdp:
+	stats->xdp_errors++;
+xdp_drop:
 	rcu_read_unlock();
-	stats->xdp_drops++;
 err_len:
 	stats->drops++;
 	put_page(page);
@@ -1033,7 +1037,12 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 		case XDP_DROP:
 			if (unlikely(xdp_page != page))
 				__free_pages(xdp_page, 0);
-			goto err_xdp;
+
+			if (unlikely(act != XDP_DROP))
+				goto err_xdp;
+
+			stats->xdp_drops++;
+			goto xdp_drop;
 		}
 	}
 	rcu_read_unlock();
@@ -1103,8 +1112,9 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 	return head_skb;

 err_xdp:
+	stats->xdp_errors++;
+xdp_drop:
 	rcu_read_unlock();
-	stats->xdp_drops++;
 err_skb:
 	put_page(page);
 	while (num_buf-- > 1) {
--
2.33.1