Subject: Re: [PATCH 1/1] tun: change speed from 10M to dynamically configured

From: roopa <[email-masked]>
Date: Thu, 19 Feb 2015 12:56:25 -0800

On 2/16/15, 9:03 AM, Stephen Hemminger wrote:
> I would like to propose this is as a more complete alternative.
>
> From: Stephen Hemminger <[email-masked]>
> Subject: [PATCH] tun: support overriding ethtool information
>
> Extensions to allow masqurade of ethtool info and device statistics.
> This is useful to provide correct information to SNMP and OSPF routing
> daemons when doing hw/sw offload of network device.
>
> Signed-off-by: Stephen Hemminger <[email-masked]>
>
> ---
>   drivers/net/tun.c              | 139 +++++++++++++++++++++++++++++++++++++----
>   include/uapi/linux/if_tunnel.h |   9 +++
>   2 files changed, 135 insertions(+), 13 deletions(-)
>
> --- a/drivers/net/tun.c	2015-02-16 11:58:00.651506008 -0500
> +++ b/drivers/net/tun.c	2015-02-16 11:59:15.560842558 -0500
> @@ -60,6 +60,7 @@
>   #include <linux/if_arp.h>
>   #include <linux/if_ether.h>
>   #include <linux/if_tun.h>
> +#include <linux/if_tunnel.h>
>   #include <linux/if_vlan.h>
>   #include <linux/crc32.h>
>   #include <linux/nsproxy.h>
> @@ -204,6 +205,9 @@ struct tun_struct {
>   	struct list_head disabled;
>   	void *security;
>   	u32 flow_count;
> +	u8 duplex;
> +	u32 speed;
> +	struct ip_tunnel_info	info;
>   };
>   
>   static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val)
> @@ -866,6 +870,33 @@ static netdev_features_t tun_net_fix_fea
>   
>   	return (features & tun->set_features) | (features & ~TUN_USER_FEATURES);
>   }
> +
> +static int
> +tun_net_set_info(struct net_device *dev, const void __user *data)
> +{
> +	struct tun_struct *tun = netdev_priv(dev);
> +	struct ip_tunnel_info info;
> +
> +	if (!capable(CAP_NET_ADMIN))
> +		return -EPERM;
> +
> +	if (copy_from_user(&info, data, sizeof(info)))
> +		return -EFAULT;
> +
> +	strlcpy(tun->info.driver, info.driver, sizeof(tun->info.driver));
> +	strlcpy(tun->info.bus, info.bus, sizeof(tun->info.bus));
> +	return 0;
> +}
> +
> +static int
> +tun_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
> +{
> +	if (cmd != SIOCDRVINFO)
> +		return -EOPNOTSUPP;
> +
> +	return tun_net_set_info(dev, ifr->ifr_ifru.ifru_data);
> +}
> +

>   #ifdef CONFIG_NET_POLL_CONTROLLER
>   static void tun_poll_controller(struct net_device *dev)
>   {
> @@ -904,6 +935,7 @@ static const struct net_device_ops tap_n
>   	.ndo_change_mtu		= tun_net_change_mtu,
>   	.ndo_fix_features	= tun_net_fix_features,
>   	.ndo_set_rx_mode	= tun_net_mclist,
> +	.ndo_do_ioctl		= tun_net_ioctl,
>   	.ndo_set_mac_address	= eth_mac_addr,
>   	.ndo_validate_addr	= eth_validate_addr,
>   	.ndo_select_queue	= tun_select_queue,
> @@ -1408,6 +1440,8 @@ static void tun_setup(struct net_device
>   
>   	tun->owner = INVALID_UID;
>   	tun->group = INVALID_GID;
> +	tun->speed = SPEED_10;
> +	tun->duplex = DUPLEX_FULL;
>   
>   	dev->ethtool_ops = &tun_ethtool_ops;
>   	dev->destructor = tun_free_netdev;
> @@ -1654,6 +1688,11 @@ static int tun_set_iff(struct net *net,
>   
>   		spin_lock_init(&tun->lock);
>   
> +		strlcpy(tun->info.driver, DRV_NAME, sizeof(tun->info.driver));
> +		strlcpy(tun->info.bus,
> +			(ifr->ifr_flags & IFF_TUN) ? "tun" : "tap",
> +			sizeof(tun->info.bus));
> +
>   		err = security_tun_dev_alloc_security(&tun->security);
>   		if (err < 0)
>   			goto err_free_dev;
> @@ -2253,10 +2292,12 @@ 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);
> +
>   	cmd->supported		= 0;
>   	cmd->advertising	= 0;
> -	ethtool_cmd_speed_set(cmd, SPEED_10);
> -	cmd->duplex		= DUPLEX_FULL;
> +	ethtool_cmd_speed_set(cmd, tun->speed);
> +	cmd->duplex		= tun->duplex;
>   	cmd->port		= PORT_TP;
>   	cmd->phy_address	= 0;
>   	cmd->transceiver	= XCVR_INTERNAL;
> @@ -2266,21 +2307,24 @@ static int tun_get_settings(struct net_d
>   	return 0;
>   }
>   
> +static int tun_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
> +{
> +	struct tun_struct *tun = netdev_priv(dev);
> +
> +	tun->speed = ethtool_cmd_speed(ecmd);
> +	tun->duplex = ecmd->duplex;
> +
> +	return 0;
> +}
> +
>   static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
>   {
>   	struct tun_struct *tun = netdev_priv(dev);
>   
> -	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
> +	strlcpy(info->driver, tun->info.driver, sizeof(info->driver));
>   	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
>   
> -	switch (tun->flags & TUN_TYPE_MASK) {
> -	case IFF_TUN:
> -		strlcpy(info->bus_info, "tun", sizeof(info->bus_info));
> -		break;
> -	case IFF_TAP:
> -		strlcpy(info->bus_info, "tap", sizeof(info->bus_info));
> -		break;
> -	}
> +	strlcpy(info->bus_info, tun->info.bus, sizeof(info->bus_info));
>   }
>   
>   static u32 tun_get_msglevel(struct net_device *dev)
> @@ -2303,6 +2347,7 @@ static void tun_set_msglevel(struct net_
>   
>   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,
> --- a/include/uapi/linux/if_tunnel.h	2015-02-16 11:58:00.651506008 -0500
> +++ b/include/uapi/linux/if_tunnel.h	2015-02-16 11:58:00.651506008 -0500
> @@ -17,6 +17,12 @@
>   #define SIOCADD6RD      (SIOCDEVPRIVATE + 9)
>   #define SIOCDEL6RD      (SIOCDEVPRIVATE + 10)
>   #define SIOCCHG6RD      (SIOCDEVPRIVATE + 11)
> +#define SIOCDRVINFO	(SIOCDEVPRIVATE + 12)
> +
> +struct ip_tunnel_info {
> +	char driver[32];
> +	char bus[32];
> +};

wondering if it would be better to add an ethtool op set_drvinfo
symmetric with get_drvinfo for this ?
>   
>   #define GRE_CSUM	__cpu_to_be16(0x8000)
>   #define GRE_ROUTING	__cpu_to_be16(0x4000)
> --
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