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| author | Greg Kurz | 2015-04-24 14:50:36 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin | 2015-06-01 15:48:56 +0200 |
| commit | 8b8e658b16336f0f50aba733f51db636ef121f50 (patch) | |
| tree | 07e2259234babcd1c2f535ff43e1bede107f74d2 /drivers/net/Kconfig | |
| parent | vhost: cross-endian support for legacy devices (diff) | |
| download | kernel-qcow2-linux-8b8e658b16336f0f50aba733f51db636ef121f50.tar.gz kernel-qcow2-linux-8b8e658b16336f0f50aba733f51db636ef121f50.tar.xz kernel-qcow2-linux-8b8e658b16336f0f50aba733f51db636ef121f50.zip | |
macvtap/tun: cross-endian support for little-endian hosts
The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers
that are always little-endian. It can also be used to handle the special
case of a legacy little-endian device implemented by a big-endian host.
Let's add a flag and ioctls for big-endian devices as well. If both flags
are set, little-endian wins.
Since this is isn't a common usecase, the feature is controlled by a kernel
config option (not set by default).
Both macvtap and tun are covered by this patch since they share the same
API with userland.
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'drivers/net/Kconfig')
| -rw-r--r-- | drivers/net/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index df51d6025a90..71ac0ece2d75 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -244,6 +244,20 @@ config TUN If you don't know what to use this for, you don't need it. +config TUN_VNET_CROSS_LE + bool "Support for cross-endian vnet headers on little-endian kernels" + default n + ---help--- + This option allows TUN/TAP and MACVTAP device drivers in a + little-endian kernel to parse vnet headers that come from a + big-endian legacy virtio device. + + Userspace programs can control the feature using the TUNSETVNETBE + and TUNGETVNETBE ioctls. + + Unless you have a little-endian system hosting a big-endian virtual + machine with a legacy virtio NIC, you should say N. + config VETH tristate "Virtual ethernet pair device" ---help--- |