Subject: [RFC net-next 10/18] tun: handle XDP_TX action of offloaded program

From: Prashant Bhole <[email-masked]>
Date: Tue, 26 Nov 2019 19:07:36 +0900

When offloaded program returns XDP_TX, we need to inject the packet in
Rx path of tun. This patch injects such packets in Rx path using
tun_xdp_one.

Signed-off-by: Prashant Bhole <[email-masked]>
---
 drivers/net/tun.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 8d6cdd3e5139..084ca95358fe 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2249,7 +2249,13 @@ static u32 tun_do_xdp_offload(struct tun_struct *tun, struct tun_file *tfile,
 		case XDP_PASS:
 			break;
 		case XDP_TX:
-			/* fall through */
+			tpage.page = NULL;
+			tpage.count = 0;
+			tun_xdp_one(tun, tfile, &xdp, &flush, &tpage, false);
+			tun_put_page(&tpage);
+			if (flush)
+				xdp_do_flush_map();
+			break;
 		case XDP_REDIRECT:
 			/* fall through */
 		default:
-- 
2.20.1