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Message-ID: <1705490503-28844-1-git-send-email-wangyunjian@huawei.com>
Date: Wed, 17 Jan 2024 19:21:43 +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 v3] tun: add missing rx stats accounting in tun_xdp_act
The TUN can be used as vhost-net backend, and it is necessary to count
the packets transmitted from TUN to vhost-net/virtio-net. However, there
are some places in the receive path that were not taken into account
when using XDP. The commit 8ae1aff0b331 ("tuntap: split out XDP logic")
only includes dropped counter for XDP_DROP, XDP_ABORTED, and invalid
XDP actions. It would be beneficial to also include new accounting for
successfully received bytes using dev_sw_netstats_rx_add and introduce
new dropped counter for XDP errors on XDP_TX and XDP_REDIRECT.
Fixes: 8ae1aff0b331 ("tuntap: split out XDP logic")
Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
---
v3: update commit log and code
v2: add Fixes tag
---
drivers/net/tun.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index afa5497f7c35..0704a17e74e1 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1625,18 +1625,15 @@ static struct sk_buff *__tun_build_skb(struct tun_file *tfile,
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;
+ int err = 0;
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
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