[PATCH 3/5] tun: drop broken IFF_VNET_LE

[Michael S. Tsirkin]

Use TUNSETVNETLE/TUNGETVNETLE instead.

Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
---
 drivers/net/tun.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index c052bd6b..e3e8a0e 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -109,9 +109,11 @@ do {                                                       
        \
  * overload it to mean fasync when stored there.
  */
 #define TUN_FASYNC     IFF_ATTACH_QUEUE
+/* High bits in flags field are unused. */
+#define TUN_VNET_LE     0x80000000
 
 #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
-                     IFF_VNET_LE | IFF_MULTI_QUEUE)
+                     IFF_MULTI_QUEUE)
 #define GOODCOPY_LEN 128
 
 #define FLT_EXACT_COUNT 8
@@ -207,12 +209,12 @@ struct tun_struct {
 
 static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val)
 {
-       return __virtio16_to_cpu(tun->flags & IFF_VNET_LE, val);
+       return __virtio16_to_cpu(tun->flags & TUN_VNET_LE, val);
 }
 
 static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val)
 {
-       return __cpu_to_virtio16(tun->flags & IFF_VNET_LE, val);
+       return __cpu_to_virtio16(tun->flags & TUN_VNET_LE, val);
 }
 
 static inline u32 tun_hashfn(u32 rxhash)
@@ -1853,6 +1855,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned 
int cmd,
        int sndbuf;
        int vnet_hdr_sz;
        unsigned int ifindex;
+       int le;
        int ret;
 
        if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) {
@@ -2052,6 +2055,23 @@ static long __tun_chr_ioctl(struct file *file, unsigned 
int cmd,
                tun->vnet_hdr_sz = vnet_hdr_sz;
                break;
 
+       case TUNGETVNETLE:
+               le = !!(tun->flags & TUN_VNET_LE);
+               if (put_user(le, (int __user *)argp))
+                       ret = -EFAULT;
+               break;
+
+       case TUNSETVNETLE:
+               if (get_user(le, (int __user *)argp)) {
+                       ret = -EFAULT;
+                       break;
+               }
+               if (le)
+                       tun->flags |= TUN_VNET_LE;
+               else
+                       tun->flags &= ~TUN_VNET_LE;
+               break;
+
        case TUNATTACHFILTER:
                /* Can be set only for TAPs */
                ret = -EINVAL;
-- 
MST

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