linux-kernel - [PATCH net-next V2 07/11] tuntap: move XDP flushing out of tun_do

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Message-Id: <20180912031709.14112-8-jasowang@redhat.com>
Date:   Wed, 12 Sep 2018 11:17:05 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        mst@...hat.com, jasowang@...hat.com
Subject: [PATCH net-next V2 07/11] tuntap: move XDP flushing out of tun_do_xdp()

This will allow adding batch flushing on top.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/tun.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 14fe94098180..3ae539374f6b 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1660,7 +1660,6 @@ static int tun_xdp_act(struct tun_struct *tun, struct bpf_prog *xdp_prog,
 	switch (act) {
 	case XDP_REDIRECT:
 		err = xdp_do_redirect(tun->dev, xdp, xdp_prog);
-		xdp_do_flush_map();
 		if (err)
 			return err;
 		break;
@@ -1749,6 +1748,8 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 		err = tun_xdp_act(tun, xdp_prog, &xdp, act);
 		if (err < 0)
 			goto err_xdp;
+		if (err == XDP_REDIRECT)
+			xdp_do_flush_map();
 		if (err != XDP_PASS)
 			goto out;
 
-- 
2.17.1