netdev - [PATCH 1/1] tun: change speed from 10M to dynamically configured

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Message-ID: <1423808353-8722-2-git-send-email-Yanjun.Zhu@windriver.com>
Date:	Fri, 13 Feb 2015 14:19:13 +0800
From:	Zhu Yanjun <Yanjun.Zhu@...driver.com>
To:	<netdev@...r.kernel.org>, <mst@...hat.com>, <jasowang@...hat.com>,
	<viro@...iv.linux.org.uk>, <davem@...emloft.net>,
	<sergei.shtylyov@...entembedded.com>, <jonathon.reinhart@...il.com>
Subject: [PATCH 1/1] tun: change speed from 10M to dynamically configured

The default speed of normal nic is 1000M while the default speed
of tun is 10M. Now the default speed of tun is changed to 1000M.
And there are 3 options: 10M, 100M and 1000M to the speed of tun.
The command "ethtool -s tun0 speed 10/100/1000" can configure the
speed of tun dynamically.

CC: Michael S. Tsirkin <mst@...hat.com>
CC: Jason Wang <jasowang@...hat.com>
CC: Al Viro <viro@...iv.linux.org.uk>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Reviewed-by: Jonathon Reinhart <jonathon.reinhart@...il.com>
Signed-off-by: Zhu Yanjun <Yanjun.Zhu@...driver.com>
---
 drivers/net/tun.c           | 43 ++++++++++++++++++++++++++++++++++++++++++-
 include/uapi/linux/if_tun.h |  5 +++++
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 8c8dc16..423b276 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -950,6 +950,9 @@ static void tun_net_init(struct net_device *dev)
 		dev->addr_len = 0;
 		dev->mtu = 1500;
 
+		/* Set default speed 1000M */
+		tun->flags |= TUN_CTRL_SPD_1000;
+
 		/* Zero header length */
 		dev->type = ARPHRD_NONE;
 		dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
@@ -2257,9 +2260,18 @@ static struct miscdevice tun_miscdev = {
 
 static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 {
+	struct tun_struct *tun = netdev_priv(dev);
+
+	/* Get the speed of tun */
+	if (tun->flags & TUN_CTRL_SPD_1000) {
+		ethtool_cmd_speed_set(cmd, SPEED_1000);
+	} else if (tun->flags & TUN_CTRL_SPD_100) {
+		ethtool_cmd_speed_set(cmd, SPEED_100);
+	} else
+		ethtool_cmd_speed_set(cmd, SPEED_10);
+
 	cmd->supported		= 0;
 	cmd->advertising	= 0;
-	ethtool_cmd_speed_set(cmd, SPEED_10);
 	cmd->duplex		= DUPLEX_FULL;
 	cmd->port		= PORT_TP;
 	cmd->phy_address	= 0;
@@ -2287,6 +2299,34 @@ static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info
 	}
 }
 
+static int tun_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct tun_struct *tun = netdev_priv(dev);
+	u32 speed = ethtool_cmd_speed(cmd);
+	int ret = 0;
+
+	/* Set speed flag */
+	switch (speed) {
+	case 10:
+		tun->flags &= ~(TUN_CTRL_SPD_100 | TUN_CTRL_SPD_1000);
+		tun->flags |= TUN_CTRL_SPD_10;
+		break;
+	case 100:
+		tun->flags &= ~(TUN_CTRL_SPD_10 | TUN_CTRL_SPD_1000);
+		tun->flags |= TUN_CTRL_SPD_100;
+		break;
+	case 1000:
+		tun->flags &= ~(TUN_CTRL_SPD_10 | TUN_CTRL_SPD_100);
+		tun->flags |= TUN_CTRL_SPD_1000;
+		break;
+	default:
+		ret = -EINVAL;
+		tun_debug(KERN_INFO, tun, "wrong speed!\n");
+	}
+
+	return ret;
+}
+
 static u32 tun_get_msglevel(struct net_device *dev)
 {
 #ifdef TUN_DEBUG
@@ -2307,6 +2347,7 @@ static void tun_set_msglevel(struct net_device *dev, u32 value)
 
 static const struct ethtool_ops tun_ethtool_ops = {
 	.get_settings	= tun_get_settings,
+	.set_settings	= tun_set_settings,
 	.get_drvinfo	= tun_get_drvinfo,
 	.get_msglevel	= tun_get_msglevel,
 	.set_msglevel	= tun_set_msglevel,
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 50ae243..78a09a7 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -66,6 +66,11 @@
 #define IFF_PERSIST	0x0800
 #define IFF_NOFILTER	0x1000
 
+/*add speed control, default 1000M*/
+#define TUN_CTRL_SPD_10         0x0020
+#define TUN_CTRL_SPD_100        0x0040
+#define TUN_CTRL_SPD_1000       0x0080
+
 /* Socket options */
 #define TUN_TX_TIMESTAMP 1
 
-- 
1.9.1

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