Re: [Qemu-devel] [PATCH V4 04/12] net/filter-mirror.c: Add new option to enable vnet support for filter-redirector

[Jason Wang]

On 2017年05月12日 09:41, Zhang Chen wrote:
> We add the vnet_hdr option for filter-redirector, default is disable.
> If you use virtio-net-pci net driver, please enable it.

We need a better commit log here to explain e.g why we need this option.

Thanks

> You can use it for example:
> -object filter-redirector,id=r0,netdev=hn0,queue=tx,outdev=red0,vnet_hdr=on
>
> Signed-off-by: Zhang Chen <address@hidden>
> ---
>   net/filter-mirror.c | 33 +++++++++++++++++++++++++++++++++
>   qemu-options.hx     |  5 +++--
>   2 files changed, 36 insertions(+), 2 deletions(-)
>
> diff --git a/net/filter-mirror.c b/net/filter-mirror.c
> index 64323fc..a65853c 100644
> --- a/net/filter-mirror.c
> +++ b/net/filter-mirror.c
> @@ -377,6 +377,13 @@ static char *filter_redirector_get_outdev(Object *obj, 
> Error **errp)
>       return g_strdup(s->outdev);
>   }
>   
> +static char *filter_redirector_get_vnet_hdr(Object *obj, Error **errp)
> +{
> +    MirrorState *s = FILTER_REDIRECTOR(obj);
> +
> +    return s->vnet_hdr ? g_strdup("on") : g_strdup("off");
> +}
> +
>   static void
>   filter_redirector_set_outdev(Object *obj, const char *value, Error **errp)
>   {
> @@ -386,6 +393,21 @@ filter_redirector_set_outdev(Object *obj, const char 
> *value, Error **errp)
>       s->outdev = g_strdup(value);
>   }
>   
> +static void filter_redirector_set_vnet_hdr(Object *obj,
> +                                           const char *value,
> +                                           Error **errp)
> +{
> +    MirrorState *s = FILTER_REDIRECTOR(obj);
> +
> +    if (strcmp(value, "on") && strcmp(value, "off")) {
> +        error_setg(errp, "Invalid value for filter-redirector vnet_hdr, "
> +                         "should be 'on' or 'off'");
> +        return;
> +    }
> +
> +    s->vnet_hdr = !strcmp(value, "on");
> +}
> +
>   static void filter_mirror_init(Object *obj)
>   {
>       MirrorState *s = FILTER_MIRROR(obj);
> @@ -405,10 +427,21 @@ static void filter_mirror_init(Object *obj)
>   
>   static void filter_redirector_init(Object *obj)
>   {
> +    MirrorState *s = FILTER_REDIRECTOR(obj);
> +
>       object_property_add_str(obj, "indev", filter_redirector_get_indev,
>                               filter_redirector_set_indev, NULL);
>       object_property_add_str(obj, "outdev", filter_redirector_get_outdev,
>                               filter_redirector_set_outdev, NULL);
> +
> +    /*
> +     * The vnet_hdr is disabled by default, if you want to enable
> +     * this option, you must enable all the option on related modules
> +     * (like other filter or colo-compare).
> +     */
> +    s->vnet_hdr = false;
> +    object_property_add_str(obj, "vnet_hdr", filter_redirector_get_vnet_hdr,
> +                            filter_redirector_set_vnet_hdr, NULL);
>   }
>   
>   static void filter_mirror_fini(Object *obj)
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 1e08481..0f81c22 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -4031,10 +4031,11 @@ filter-mirror on netdev @var{netdevid},mirror net 
> packet to chardev
>   with vnet_hdr_len.
>   
>   @item -object filter-redirector,address@hidden,address@hidden,address@hidden,
> address@hidden,address@hidden|rx|tx}]
> address@hidden,address@hidden|off}[,address@hidden|rx|tx}]
>   
>   filter-redirector on netdev @var{netdevid},redirect filter's net packet to chardev
> address@hidden,and redirect indev's packet to filter.
> address@hidden,and redirect indev's packet to filter.if vnet_hdr = on,
> +filter-redirector will redirect packet with vnet_hdr_len.
>   Create a filter-redirector we need to differ outdev id from indev id, id can 
> not
>   be the same. we can just use indev or outdev, but at least one of indev or 
> outdev
>   need to be specified.