netdev - [RFC net-next 14/14] tun: run xdp prog when tun is read from file interface

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Message-Id: <20191218081050.10170-15-prashantbhole.linux@gmail.com>
Date:   Wed, 18 Dec 2019 17:10:50 +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 14/14] tun: run xdp prog when tun is read from file interface

It handles the case when qemu performs read on tun using file
operations.

Signed-off-by: Prashant Bhole <prashantbhole.linux@...il.com>
---
 drivers/net/tun.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 8e2fe0ad7955..0a9ac380c1b4 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2335,8 +2335,10 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
 			   struct iov_iter *to,
 			   int noblock, void *ptr)
 {
+	struct xdp_frame *frame;
 	ssize_t ret;
 	int err;
+	u32 act;
 
 	tun_debug(KERN_INFO, tun, "tun_do_read\n");
 
@@ -2350,6 +2352,15 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
 		ptr = tun_ring_recv(tfile, noblock, &err);
 		if (!ptr)
 			return err;
+
+		if (tun_is_xdp_frame(ptr)) {
+			frame = tun_ptr_to_xdp(ptr);
+			act = tun_do_xdp_tx(tun, tfile, frame);
+		} else {
+			act = tun_do_xdp_tx_generic(tun, ptr);
+		}
+		if (act != XDP_PASS)
+			return err;
 	}
 
 	if (tun_is_xdp_frame(ptr)) {
-- 
2.21.0