[libvirt] [PATCHv3 04/11] qemu: Make qemuMonitorAddHostNetwork to pass multiple FDs

[Michal Privoznik]

Currently, only one tapfd and one vhostfd could be passed.
However, multiqueue network requires several FDs to be passed to
qemu so we must adapt out monitor handling functions to cope with
that.
---
 src/qemu/qemu_hotplug.c |  7 +++++--
 src/qemu/qemu_monitor.c | 39 +++++++++++++++++++++++----------------
 src/qemu/qemu_monitor.h |  4 ++--
 3 files changed, 30 insertions(+), 20 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index b04f3bb..41431b3 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -823,8 +823,11 @@ int qemuDomainAttachNetDevice(virConnectPtr conn,
             goto cleanup;
         }
     } else {
-        if (qemuMonitorAddHostNetwork(priv->mon, netstr, tapfd, tapfd_name,
-                                      vhostfd, vhostfd_name) < 0) {
+        if (qemuMonitorAddHostNetwork(priv->mon, netstr,
+                                      &tapfd, &tapfd_name,
+                                      tapfd_name ? 1 : 0,
+                                      &vhostfd, &vhostfd_name,
+                                      vhostfd_name ? 1 : 0) < 0) {
             qemuDomainObjExitMonitor(driver, vm);
             virDomainAuditNet(vm, NULL, net, "attach", false);
             goto cleanup;
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index 1d65dd8..524eb9d 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -2477,14 +2477,16 @@ cleanup:
 
 int qemuMonitorAddHostNetwork(qemuMonitorPtr mon,
                               const char *netstr,
-                              int tapfd, const char *tapfd_name,
-                              int vhostfd, const char *vhostfd_name)
+                              int *tapfd, char **tapfdName, int tapfdSize,
+                              int *vhostfd, char **vhostfdName, int vhostfdSize)
 {
     int ret = -1;
-    VIR_DEBUG("mon=%p netstr=%s tapfd=%d tapfd_name=%s "
-              "vhostfd=%d vhostfd_name=%s",
-              mon, netstr, tapfd, NULLSTR(tapfd_name),
-              vhostfd, NULLSTR(vhostfd_name));
+    int i = 0, j = 0;
+
+    VIR_DEBUG("mon=%p netstr=%s tapfd=%p tapfdName=%p tapfdSize=%d "
+              "vhostfd=%p vhostfdName=%p vhostfdSize=%d",
+              mon, netstr, tapfd, tapfdName, tapfdSize,
+              vhostfd, vhostfdName, vhostfdSize);
 
     if (!mon) {
         virReportError(VIR_ERR_INVALID_ARG, "%s",
@@ -2492,12 +2494,13 @@ int qemuMonitorAddHostNetwork(qemuMonitorPtr mon,
         return -1;
     }
 
-    if (tapfd >= 0 && qemuMonitorSendFileHandle(mon, tapfd_name, tapfd) < 0)
-        return -1;
-    if (vhostfd >= 0 &&
-        qemuMonitorSendFileHandle(mon, vhostfd_name, vhostfd) < 0) {
-        vhostfd = -1;
-        goto cleanup;
+    for (i = 0; i < tapfdSize; i++) {
+        if (qemuMonitorSendFileHandle(mon, tapfdName[i], tapfd[i]) < 0)
+            goto cleanup;
+    }
+    for (j = 0; j < vhostfdSize; j++) {
+        if (qemuMonitorSendFileHandle(mon, vhostfdName[j], vhostfd[j]) < 0)
+            goto cleanup;
     }
 
     if (mon->json)
@@ -2508,10 +2511,14 @@ int qemuMonitorAddHostNetwork(qemuMonitorPtr mon,
 
 cleanup:
     if (ret < 0) {
-        if (tapfd >= 0 && qemuMonitorCloseFileHandle(mon, tapfd_name) < 0)
-            VIR_WARN("failed to close device handle '%s'", tapfd_name);
-        if (vhostfd >= 0 && qemuMonitorCloseFileHandle(mon, vhostfd_name) < 0)
-            VIR_WARN("failed to close device handle '%s'", vhostfd_name);
+        while (i--) {
+            if (qemuMonitorCloseFileHandle(mon, tapfdName[i]) < 0)
+                VIR_WARN("failed to close device handle '%s'", tapfdName[i]);
+        }
+        while (j--) {
+            if (qemuMonitorCloseFileHandle(mon, vhostfdName[j]) < 0)
+                VIR_WARN("failed to close device handle '%s'", vhostfdName[j]);
+        }
     }
 
     return ret;
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index f08e468..a607712 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -501,8 +501,8 @@ int qemuMonitorRemoveFd(qemuMonitorPtr mon, int fdset, int fd);
  */
 int qemuMonitorAddHostNetwork(qemuMonitorPtr mon,
                               const char *netstr,
-                              int tapfd, const char *tapfd_name,
-                              int vhostfd, const char *vhostfd_name);
+                              int *tapfd, char **tapfdName, int tapfdSize,
+                              int *vhostfd, char **vhostfdName, int vhostfdSize);
 
 int qemuMonitorRemoveHostNetwork(qemuMonitorPtr mon,
                                  int vlan,
-- 
1.8.2.1