netdev - [RFC net-next 13/14] tun: handle XDP_TX action of tx path XDP program

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Date:   Wed, 18 Dec 2019 17:10:49 +0900
From:   Prashant Bhole <prashantbhole.linux@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>
Cc:     Prashant Bhole <prashantbhole.linux@...il.com>,
        Jason Wang <jasowang@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        Toshiaki Makita <toshiaki.makita1@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org
Subject: [RFC net-next 13/14] tun: handle XDP_TX action of tx path XDP program

When the action code is 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 <prashantbhole.linux@...il.com>
---
 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 0701a7a80346..8e2fe0ad7955 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2266,7 +2266,13 @@ static u32 tun_do_xdp_tx(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:
-- 
2.21.0