netdev - [PATCH net] tun: add missing rx stats accounting in tun_xdp

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Date: Tue, 16 Jan 2024 17:36:20 +0800
From: Yunjian Wang <wangyunjian@...wei.com>
To: <willemdebruijn.kernel@...il.com>, <jasowang@...hat.com>,
	<kuba@...nel.org>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<xudingke@...wei.com>, Yunjian Wang <wangyunjian@...wei.com>
Subject: [PATCH net] tun: add missing rx stats accounting in tun_xdp_act

There are few places on the receive path where packet receives and packet
drops were not accounted for. This patch fixes that issue.

Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
---
 drivers/net/tun.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index afa5497f7c35..232e5319ac77 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1626,17 +1626,14 @@ static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog,
 		       struct xdp_buff *xdp, u32 act)
 {
 	int err;
+	unsigned int datasize = xdp->data_end - xdp->data;
 
 	switch (act) {
 	case XDP_REDIRECT:
 		err = xdp_do_redirect(tun->dev, xdp, xdp_prog);
-		if (err)
-			return err;
 		break;
 	case XDP_TX:
 		err = tun_xdp_tx(tun->dev, xdp);
-		if (err < 0)
-			return err;
 		break;
 	case XDP_PASS:
 		break;
@@ -1651,6 +1648,13 @@ static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog,
 		break;
 	}
 
+	if (err < 0) {
+		act = err;
+		dev_core_stats_rx_dropped_inc(tun->dev);
+	} else if (act == XDP_REDIRECT || act == XDP_TX) {
+		dev_sw_netstats_rx_add(tun->dev, datasize);
+	}
+
 	return act;
 }
 
-- 
2.41.0