Re: [Qemu-devel] [PATCH 2/6] Revert "vhost-net: tell tap backend about the vnet endianness"

[Cornelia Huck <cornelia.huck@de.ibm.com>]

On Thu, 07 Jan 2016 12:32:08 +0100
Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:

> This reverts commit 5be7d9f1b1452613b95c6ba70b8d7ad3d0797991.
> 
> Cross-endian is now configured by the core virtio-net code. We simply
> fall back on full emulation if the net backend cannot support the
> requested endianness for vnet headers.
> 
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
>  hw/net/vhost_net.c  |   33 +--------------------------------
>  hw/net/virtio-net.c |    7 +++++++
>  2 files changed, 8 insertions(+), 32 deletions(-)

> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index d4cc94ea5e55..5a0ab6ad5bb5 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -128,6 +128,13 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
>      if (!n->vhost_started) {
>          int r, i;
> 
> +        if (n->needs_vnet_hdr_swap) {
> +            error_report("backend does not support %s vnet headers."

s/./;/

> +                         "falling back on userspace virtio",

s/on/to/

?

> +                         virtio_is_big_endian(vdev) ? "BE" : "LE");
> +            return;
> +        }
> +
>          /* Any packets outstanding? Purge them to avoid touching rings
>           * when vhost is running.
>           */
> 
>