[Qemu-devel] [PATCH V4 06/12] net/colo-compare.c: Add new option to enable vnet support for colo-compare

[Zhang Chen <zhangchen.fnst@cn.fujitsu.com>]

We add the vnet_hdr option for colo-compare, default is disable.
If you use virtio-net-pci net driver, please enable it.
You can use it for example:
-object colo-compare,id=comp0,primary_in=compare0-0,secondary_in=compare1,outdev=compare_out0,vnet_hdr=on

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
---
 net/colo-compare.c | 34 +++++++++++++++++++++++++++++++++-
 qemu-options.hx    |  3 ++-
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index 332f57e..99a6912 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -73,6 +73,7 @@ typedef struct CompareState {
     CharBackend chr_out;
     SocketReadState pri_rs;
     SocketReadState sec_rs;
+    bool vnet_hdr;
 
     /* connection list: the connections belonged to this NIC could be found
      * in this list.
@@ -642,6 +643,28 @@ static void compare_set_outdev(Object *obj, const char *value, Error **errp)
     s->outdev = g_strdup(value);
 }
 
+static char *compare_get_vnet_hdr(Object *obj, Error **errp)
+{
+    CompareState *s = COLO_COMPARE(obj);
+
+    return s->vnet_hdr ? g_strdup("on") : g_strdup("off");
+}
+
+static void compare_set_vnet_hdr(Object *obj,
+                                 const char *value,
+                                 Error **errp)
+{
+    CompareState *s = COLO_COMPARE(obj);
+
+    if (strcmp(value, "on") && strcmp(value, "off")) {
+        error_setg(errp, "Invalid value for colo-compare vnet_hdr, "
+                         "should be 'on' or 'off'");
+        return;
+    }
+
+    s->vnet_hdr = !strcmp(value, "on");
+}
+
 static void compare_pri_rs_finalize(SocketReadState *pri_rs)
 {
     CompareState *s = container_of(pri_rs, CompareState, pri_rs);
@@ -667,7 +690,6 @@ static void compare_sec_rs_finalize(SocketReadState *sec_rs)
     }
 }
 
-
 /*
  * Return 0 is success.
  * Return 1 is failed.
@@ -775,6 +797,8 @@ static void colo_compare_class_init(ObjectClass *oc, void *data)
 
 static void colo_compare_init(Object *obj)
 {
+    CompareState *s = COLO_COMPARE(obj);
+
     object_property_add_str(obj, "primary_in",
                             compare_get_pri_indev, compare_set_pri_indev,
                             NULL);
@@ -784,6 +808,14 @@ static void colo_compare_init(Object *obj)
     object_property_add_str(obj, "outdev",
                             compare_get_outdev, compare_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", compare_get_vnet_hdr,
+                            compare_set_vnet_hdr, NULL);
 }
 
 static void colo_compare_finalize(Object *obj)
diff --git a/qemu-options.hx b/qemu-options.hx
index 0f81c22..115b83f 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4061,12 +4061,13 @@ The file format is libpcap, so it can be analyzed with tools such as tcpdump
 or Wireshark.
 
 @item -object colo-compare,id=@var{id},primary_in=@var{chardevid},secondary_in=@var{chardevid},
-outdev=@var{chardevid}
+outdev=@var{chardevid},vnet_hdr=@var{on|off}
 
 Colo-compare gets packet from primary_in@var{chardevid} and secondary_in@var{chardevid}, than compare primary packet with
 secondary packet. If the packets are same, we will output primary
 packet to outdev@var{chardevid}, else we will notify colo-frame
 do checkpoint and send primary packet to outdev@var{chardevid}.
+if vnet_hdr = on, colo compare will send/recv packet with vnet_hdr_len.
 
 we must use it with the help of filter-mirror and filter-redirector.
 
-- 
2.7.4