[net PATCH] tuntap: set SOCK_ZEROCOPY flag during open

From: Jason Wang
Date: Tue Jun 11 2013 - 09:13:42 EST

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@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
drivers/net/tun.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index f042b03..d2ddd6d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2155,6 +2155,8 @@ static int tun_chr_open(struct inode *inode, struct file * file)
set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags);

+ sock_set_flag(&tfile->sk, SOCK_ZEROCOPY);
return 0;

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