[Qemu-devel] [RFC PATCH v4 17/28] COLO: Add new command parameter 'colo_nicname' 'colo_script' for net

[zhanghailiang <zhang.zhanghailiang@huawei.com>]

The 'colo_nicname' should be assigned with network name,
for exmple, 'eth2'. It will be parameter of 'colo_script',
'colo_script' should be assigned with an scirpt path.

We parse these parameter in tap.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
---
 include/net/net.h |  4 ++++
 net/tap.c         | 27 ++++++++++++++++++++++++---
 qapi-schema.json  |  8 +++++++-
 qemu-options.hx   | 10 +++++++++-
 4 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/include/net/net.h b/include/net/net.h
index 50ffcb9..6cc575f 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -84,6 +84,10 @@ struct NetClientState {
     char *model;
     char *name;
     char info_str[256];
+    char colo_script[1024];
+    char colo_nicname[128];
+    char ifname[128];
+    char ifb[2][128];
     unsigned receive_disabled : 1;
     NetClientDestructor *destructor;
     unsigned int queue_index;
diff --git a/net/tap.c b/net/tap.c
index 968df46..823f78e 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -608,6 +608,7 @@ static int net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
     Error *err = NULL;
     TAPState *s;
     int vhostfd;
+    NetClientState *nc = NULL;
 
     s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
     if (!s) {
@@ -635,6 +636,17 @@ static int net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
         }
     }
 
+    nc = &(s->nc);
+    snprintf(nc->ifname, sizeof(nc->ifname), "%s", ifname);
+    if (tap->has_colo_script) {
+        snprintf(nc->colo_script, sizeof(nc->colo_script), "%s",
+                 tap->colo_script);
+    }
+    if (tap->has_colo_nicname) {
+        snprintf(nc->colo_nicname, sizeof(nc->colo_nicname), "%s",
+                 tap->colo_nicname);
+    }
+
     if (tap->has_vhost ? tap->vhost :
         vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
         VhostNetOptions options;
@@ -754,9 +766,10 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
 
         if (tap->has_ifname || tap->has_script || tap->has_downscript ||
             tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
-            tap->has_vhostfd) {
+            tap->has_vhostfd || tap->has_colo_script || tap->has_colo_nicname) {
             error_report("ifname=, script=, downscript=, vnet_hdr=, "
                          "helper=, queues=, and vhostfd= "
+                         "colo_script=, and colo_nicname= "
                          "are invalid with fds=");
             return -1;
         }
@@ -796,9 +809,11 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
         }
     } else if (tap->has_helper) {
         if (tap->has_ifname || tap->has_script || tap->has_downscript ||
-            tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) {
+            tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds ||
+            tap->has_colo_script || tap->has_colo_nicname) {
             error_report("ifname=, script=, downscript=, and vnet_hdr= "
-                         "queues=, and vhostfds= are invalid with helper=");
+                         "queues=, vhostfds=, colo_script=, and "
+                         "colo_nicname= are invalid with helper=");
             return -1;
         }
 
@@ -817,6 +832,12 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
             return -1;
         }
     } else {
+        if (queues > 1 && (tap->has_colo_script || tap->has_colo_nicname)) {
+            error_report("queues > 1 is invalid if colo_script or "
+                         "colo_nicname is specified");
+            return -1;
+        }
+
         if (tap->has_vhostfds) {
             error_report("vhostfds= is invalid if fds= wasn't specified");
             return -1;
diff --git a/qapi-schema.json b/qapi-schema.json
index e11c152..8abc367 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2143,6 +2143,10 @@
 #
 # @queues: #optional number of queues to be created for multiqueue capable tap
 #
+# @colo_nicname: #optional the host physical nic for QEMU (Since 2.3)
+#
+# @colo_script: #optional the script file which used by COLO (Since 2.3)
+#
 # Since 1.2
 ##
 { 'type': 'NetdevTapOptions',
@@ -2159,7 +2163,9 @@
     '*vhostfd':    'str',
     '*vhostfds':   'str',
     '*vhostforce': 'bool',
-    '*queues':     'uint32'} }
+    '*queues':     'uint32',
+    '*colo_nicname':  'str',
+    '*colo_script':   'str'} }
 
 ##
 # @NetdevSocketOptions
diff --git a/qemu-options.hx b/qemu-options.hx
index 319d971..ff63c50 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1466,7 +1466,11 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
     "-net tap[,vlan=n][,name=str],ifname=name\n"
     "                connect the host TAP network interface to VLAN 'n'\n"
 #else
-    "-net tap[,vlan=n][,name=str][,fd=h][,fds=x:y:...:z][,ifname=name][,script=file][,downscript=dfile][,helper=helper][,sndbuf=nbytes][,vnet_hdr=on|off][,vhost=on|off][,vhostfd=h][,vhostfds=x:y:...:z][,vhostforce=on|off][,queues=n]\n"
+    "-net tap[,vlan=n][,name=str][,fd=h][,fds=x:y:...:z][,ifname=name][,script=file][,downscript=dfile][,helper=helper][,sndbuf=nbytes][,vnet_hdr=on|off][,vhost=on|off][,vhostfd=h][,vhostfds=x:y:...:z][,vhostforce=on|off][,queues=n]"
+#ifdef CONFIG_COLO
+    "[,colo_nicname=nicname][,colo_script=scriptfile]"
+#endif
+    "\n"
     "                connect the host TAP network interface to VLAN 'n'\n"
     "                use network scripts 'file' (default=" DEFAULT_NETWORK_SCRIPT ")\n"
     "                to configure it and 'dfile' (default=" DEFAULT_NETWORK_DOWN_SCRIPT ")\n"
@@ -1486,6 +1490,10 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
     "                use 'vhostfd=h' to connect to an already opened vhost net device\n"
     "                use 'vhostfds=x:y:...:z to connect to multiple already opened vhost net devices\n"
     "                use 'queues=n' to specify the number of queues to be created for multiqueue TAP\n"
+#ifdef CONFIG_COLO
+    "                use 'colo_nicname=nicname' to specify the host physical nic for QEMU\n"
+    "                use 'colo_script=scriptfile' to specify script file when colo is enabled\n"
+#endif
     "-net bridge[,vlan=n][,name=str][,br=bridge][,helper=helper]\n"
     "                connects a host TAP network interface to a host bridge device 'br'\n"
     "                (default=" DEFAULT_BRIDGE_INTERFACE ") using the program 'helper'\n"
-- 
1.7.12.4