net: don't set native endianness

commit 5be7d9f1b1452613b95c6ba70b8d7ad3d0797991
    vhost-net: tell tap backend about the vnet endianness
makes vhost net always try to set LE - even if that matches the
native endian-ness.

This makes it fail on older kernels on x86 without TUNSETVNETLE support.

To fix, make qemu_set_vnet_le/qemu_set_vnet_be skip the
ioctl if it matches the host endian-ness.

Reported-by: Marcel Apfelbaum <marcel@redhat.com>
Cc: Greg Kurz <gkurz@linux.vnet.ibm.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
(cherry picked from commit 052bd52fa978d3f04bc476137ad6e1b9a697f9bd)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/net/net.c b/net/net.c
index 28a5597b8d8db18ad07047f41c7fc11431120949..8e96011e6bab8ec36945df6d69b2947dfc67e82e 100644 (file)
--- a/net/net.c
+++ b/net/net.c
@@ -517,20 +517,28 @@ void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
 
 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
 {
+#ifdef HOST_WORDS_BIGENDIAN
     if (!nc || !nc->info->set_vnet_le) {
         return -ENOSYS;
     }
 
     return nc->info->set_vnet_le(nc, is_le);
+#else
+    return 0;
+#endif
 }
 
 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
 {
+#ifdef HOST_WORDS_BIGENDIAN
+    return 0;
+#else
     if (!nc || !nc->info->set_vnet_be) {
         return -ENOSYS;
     }
 
     return nc->info->set_vnet_be(nc, is_be);
+#endif
 }
 
 int qemu_can_send_packet(NetClientState *sender)