diff options
| -rw-r--r-- | drivers/net/tun.c | 63 |
1 files changed, 25 insertions, 38 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index f5e9ac00a07..ade3cf9cd32 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -123,6 +123,9 @@ struct tun_struct { gid_t group; struct net_device *dev; + u32 set_features; +#define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ + NETIF_F_TSO6|NETIF_F_UFO) struct fasync_struct *fasync; struct tap_filter txflt; @@ -451,12 +454,20 @@ tun_net_change_mtu(struct net_device *dev, int new_mtu) return 0; } +static u32 tun_net_fix_features(struct net_device *dev, u32 features) +{ + struct tun_struct *tun = netdev_priv(dev); + + return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); +} + static const struct net_device_ops tun_netdev_ops = { .ndo_uninit = tun_net_uninit, .ndo_open = tun_net_open, .ndo_stop = tun_net_close, .ndo_start_xmit = tun_net_xmit, .ndo_change_mtu = tun_net_change_mtu, + .ndo_fix_features = tun_net_fix_features, }; static const struct net_device_ops tap_netdev_ops = { @@ -465,6 +476,7 @@ static const struct net_device_ops tap_netdev_ops = { .ndo_stop = tun_net_close, .ndo_start_xmit = tun_net_xmit, .ndo_change_mtu = tun_net_change_mtu, + .ndo_fix_features = tun_net_fix_features, .ndo_set_multicast_list = tun_net_mclist, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, @@ -628,8 +640,7 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, kfree_skb(skb); return -EINVAL; } - } else if (tun->flags & TUN_NOCHECKSUM) - skb->ip_summed = CHECKSUM_UNNECESSARY; + } switch (tun->flags & TUN_TYPE_MASK) { case TUN_TUN_DEV: @@ -1094,6 +1105,10 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) goto err_free_sk; } + dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | + TUN_USER_FEATURES; + dev->features = dev->hw_features; + err = register_netdevice(tun->dev); if (err < 0) goto err_free_sk; @@ -1158,18 +1173,12 @@ static int tun_get_iff(struct net *net, struct tun_struct *tun, /* This is like a cut-down ethtool ops, except done via tun fd so no * privs required. */ -static int set_offload(struct net_device *dev, unsigned long arg) +static int set_offload(struct tun_struct *tun, unsigned long arg) { - u32 old_features, features; - - old_features = dev->features; - /* Unset features, set them as we chew on the arg. */ - features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST - |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6 - |NETIF_F_UFO)); + u32 features = 0; if (arg & TUN_F_CSUM) { - features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; + features |= NETIF_F_HW_CSUM; arg &= ~TUN_F_CSUM; if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { @@ -1195,9 +1204,8 @@ static int set_offload(struct net_device *dev, unsigned long arg) if (arg) return -EINVAL; - dev->features = features; - if (old_features != dev->features) - netdev_features_change(dev); + tun->set_features = features; + netdev_update_features(tun->dev); return 0; } @@ -1262,12 +1270,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, case TUNSETNOCSUM: /* Disable/Enable checksum */ - if (arg) - tun->flags |= TUN_NOCHECKSUM; - else - tun->flags &= ~TUN_NOCHECKSUM; - tun_debug(KERN_INFO, tun, "checksum %s\n", + /* [unimplemented] */ + tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", arg ? "disabled" : "enabled"); break; @@ -1316,7 +1321,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, break; #endif case TUNSETOFFLOAD: - ret = set_offload(tun->dev, arg); + ret = set_offload(tun, arg); break; case TUNSETTXFILTER: @@ -1595,30 +1600,12 @@ static void tun_set_msglevel(struct net_device *dev, u32 value) #endif } -static u32 tun_get_rx_csum(struct net_device *dev) -{ - struct tun_struct *tun = netdev_priv(dev); - return (tun->flags & TUN_NOCHECKSUM) == 0; -} - -static int tun_set_rx_csum(struct net_device *dev, u32 data) -{ - struct tun_struct *tun = netdev_priv(dev); - if (data) - tun->flags &= ~TUN_NOCHECKSUM; - else - tun->flags |= TUN_NOCHECKSUM; - return 0; -} - static const struct ethtool_ops tun_ethtool_ops = { .get_settings = tun_get_settings, .get_drvinfo = tun_get_drvinfo, .get_msglevel = tun_get_msglevel, .set_msglevel = tun_set_msglevel, .get_link = ethtool_op_get_link, - .get_rx_csum = tun_get_rx_csum, - .set_rx_csum = tun_set_rx_csum }; |