[libvirt] [PATCH v2 11/12] qemu: Adapt qemuBuildInterfaceCommandLine to to multiqueue net

[Michal Privoznik]

---
 src/qemu/qemu_command.c | 85 ++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 62 insertions(+), 23 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d466725..cdca2db 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6425,12 +6425,16 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
                               enum virNetDevVPortProfileOp vmop)
 {
     int ret = -1;
-    int tapfd = -1;
     char *nic = NULL, *host = NULL;
-    char *tapfdName = NULL;
-    char *vhostfdName = NULL;
+    int *tapfd = NULL;
+    int tapfdSize = 0;
+    int *vhostfd = NULL;
+    int vhostfdSize = 0;
+    char **tapfdName = NULL;
+    char **vhostfdName = NULL;
     int actualType = virDomainNetGetActualType(net);
     virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+    int i;
 
     if (actualType == VIR_DOMAIN_NET_TYPE_HOSTDEV) {
         /* NET_TYPE_HOSTDEV devices are really hostdev devices, so
@@ -6445,12 +6449,24 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
 
     if (actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
         actualType == VIR_DOMAIN_NET_TYPE_BRIDGE) {
+        if (VIR_ALLOC(tapfd) < 0 || VIR_ALLOC(tapfdName) < 0) {
+            virReportOOMError();
+            goto cleanup;
+        }
+
+        tapfdSize = 1;
         if (qemuNetworkIfaceConnect(def, conn, driver, net,
-                                    qemuCaps, &tapfd, 1) < 0)
+                                    qemuCaps, tapfd, tapfdSize) < 0)
             goto cleanup;
     } else if (actualType == VIR_DOMAIN_NET_TYPE_DIRECT) {
-        tapfd = qemuPhysIfaceConnect(def, driver, net, qemuCaps, vmop);
-        if (tapfd < 0)
+        if (VIR_ALLOC(tapfd) < 0 || VIR_ALLOC(tapfdName) < 0) {
+            virReportOOMError();
+            goto cleanup;
+        }
+        tapfdSize = 1;
+        tapfd[0] = qemuPhysIfaceConnect(def, driver, net,
+                                        qemuCaps, vmop);
+        if (tapfd[0] < 0)
             goto cleanup;
     }
 
@@ -6458,30 +6474,41 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
         actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
         actualType == VIR_DOMAIN_NET_TYPE_ETHERNET ||
         actualType == VIR_DOMAIN_NET_TYPE_DIRECT) {
+        int useVhost;
         /* Attempt to use vhost-net mode for these types of
            network device */
-        int vhostfd;
+        if (VIR_ALLOC(vhostfd) < 0 || VIR_ALLOC(vhostfdName)) {
+            virReportOOMError();
+            goto cleanup;
+        }
+        vhostfdSize = 1;
+
+        useVhost = qemuOpenVhostNet(def, net, qemuCaps, vhostfd, vhostfdSize);
+        if (useVhost < 0)
+            goto cleanup;
+        if (useVhost > 0)
+            vhostfdSize = 0;
+    }
 
-        if (qemuOpenVhostNet(def, net, qemuCaps, &vhostfd, 1) < 0)
+    for (i = 0; i < tapfdSize; i++) {
+        if (virAsprintf(&tapfdName[i], "%d", tapfd[i]) < 0) {
+            virReportOOMError();
             goto cleanup;
-        if (vhostfd >= 0) {
-            virCommandTransferFD(cmd, vhostfd);
+        }
+        virCommandTransferFD(cmd, tapfd[i]);
+    }
+
+    for (i = 0; i < vhostfdSize; i++) {
+        if (vhostfd[i] >= 0) {
+            virCommandTransferFD(cmd, vhostfd[i]);
 
-            if (virAsprintf(&vhostfdName, "%d", vhostfd) < 0) {
+            if (virAsprintf(&vhostfdName[i], "%d", vhostfd[i]) < 0) {
                 virReportOOMError();
                 goto cleanup;
             }
         }
     }
 
-    if (tapfd >= 0) {
-        if (virAsprintf(&tapfdName, "%d", tapfd) < 0) {
-            virReportOOMError();
-            goto cleanup;
-        }
-        virCommandTransferFD(cmd, tapfd);
-    }
-
     /* Possible combinations:
      *
      *  1. Old way:   -net nic,model=e1000,vlan=1 -net tap,vlan=1
@@ -6494,8 +6521,8 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
         virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE)) {
         if (!(host = qemuBuildHostNetStr(net, driver,
                                          ',', vlan,
-                                         &tapfdName, tapfdName ? 1 : 0,
-                                         &vhostfdName, vhostfdName ?  1 : 0)))
+                                         tapfdName, tapfdSize,
+                                         vhostfdName, vhostfdSize)))
             goto cleanup;
         virCommandAddArgList(cmd, "-netdev", host, NULL);
     }
@@ -6512,8 +6539,8 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
           virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE))) {
         if (!(host = qemuBuildHostNetStr(net, driver,
                                          ',', vlan,
-                                         &tapfdName, tapfdName ? 1 : 0,
-                                         &vhostfdName, vhostfdName ? 1 : 0)))
+                                         tapfdName, tapfdSize,
+                                         vhostfdName, vhostfdSize)))
             goto cleanup;
         virCommandAddArgList(cmd, "-net", host, NULL);
     }
@@ -6522,6 +6549,18 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
 cleanup:
     if (ret < 0)
         virDomainConfNWFilterTeardown(net);
+    for (i = 0; i < tapfdSize; i++) {
+        if (ret < 0)
+            VIR_FORCE_CLOSE(tapfd[i]);
+        VIR_FREE(tapfdName[i]);
+    }
+    for (i = 0; i < vhostfdSize; i++) {
+        if (ret < 0)
+            VIR_FORCE_CLOSE(vhostfd[i]);
+        VIR_FREE(vhostfdName[i]);
+    }
+    VIR_FREE(tapfd);
+    VIR_FREE(vhostfd);
     VIR_FREE(nic);
     VIR_FREE(host);
     VIR_FREE(tapfdName);
-- 
1.8.2.1