linux-kernel - [PATCH 084/105] tuntap: set SOCK

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Message-Id: <1372445527-24414-85-git-send-email-kamal@canonical.com>
Date:	Fri, 28 Jun 2013 11:51:46 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 084/105] tuntap: set SOCK_ZEROCOPY flag during open

3.8.13.4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Wang <jasowang@...hat.com>

[ Upstream commit 19a6afb23e5d323e1245baa4e62755492b2f1200 ]

Commit 54f968d6efdbf7dec36faa44fc11f01b0e4d1990
(tuntap: move socket to tun_file) forgets to set SOCK_ZEROCOPY flag, which will
prevent vhost_net from doing zercopy w/ tap. This patch fixes this by setting
it during file open.

Cc: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/tun.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 2129cf90..2a56317 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2154,6 +2154,8 @@ static int tun_chr_open(struct inode *inode, struct file * file)
 	set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags);
 	INIT_LIST_HEAD(&tfile->next);
 
+	sock_set_flag(&tfile->sk, SOCK_ZEROCOPY);
+
 	return 0;
 }
 
-- 
1.8.1.2

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