[Xen-devel] [PATCH V3 2/5] util: Allow port allocator to skip bind() check

[Jim Fehlig <jfehlig@xxxxxxxx>]

From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>

Test suites using the port allocator don't want to have different
behaviour depending on whether a port is in use on the host. Add
a VIR_PORT_ALLOCATOR_SKIP_BIND_CHECK which test suites can use
to skip the bind() test. The port allocator will thus only track
ports in use by the test suite process itself. This is fine when
using the port allocator to generate guest configs which won't
actually be launched

Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---
 src/libxl/libxl_driver.c     |  5 +++--
 src/qemu/qemu_driver.c       |  9 ++++++---
 src/util/virportallocator.c  | 14 ++++++++++----
 src/util/virportallocator.h  |  7 ++++++-
 tests/virportallocatortest.c |  4 ++--
 5 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 67fd7bc6..17d6257 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -301,14 +301,15 @@ libxlStateInitialize(bool privileged,
     if (!(libxl_driver->reservedVNCPorts =
           virPortAllocatorNew(_("VNC"),
                               LIBXL_VNC_PORT_MIN,
-                              LIBXL_VNC_PORT_MAX)))
+                              LIBXL_VNC_PORT_MAX,
+                              0)))
         goto error;
 
     /* Allocate bitmap for migration port reservation */
     if (!(libxl_driver->migrationPorts =
           virPortAllocatorNew(_("migration"),
                               LIBXL_MIGRATION_PORT_MIN,
-                              LIBXL_MIGRATION_PORT_MAX)))
+                              LIBXL_MIGRATION_PORT_MAX, 0)))
         goto error;
 
     if (!(libxl_driver->domains = virDomainObjListNew()))
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 239a300..6b4dbf3 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -731,19 +731,22 @@ qemuStateInitialize(bool privileged,
     if ((qemu_driver->remotePorts =
          virPortAllocatorNew(_("display"),
                              cfg->remotePortMin,
-                             cfg->remotePortMax)) == NULL)
+                             cfg->remotePortMax,
+                             0)) == NULL)
         goto error;
 
     if ((qemu_driver->webSocketPorts =
          virPortAllocatorNew(_("webSocket"),
                              cfg->webSocketPortMin,
-                             cfg->webSocketPortMax)) == NULL)
+                             cfg->webSocketPortMax,
+                             0)) == NULL)
         goto error;
 
     if ((qemu_driver->migrationPorts =
          virPortAllocatorNew(_("migration"),
                              cfg->migrationPortMin,
-                             cfg->migrationPortMax)) == NULL)
+                             cfg->migrationPortMax,
+                             0)) == NULL)
         goto error;
 
     if (qemuSecurityInit(qemu_driver) < 0)
diff --git a/src/util/virportallocator.c b/src/util/virportallocator.c
index ff5691a..d40c6b1 100644
--- a/src/util/virportallocator.c
+++ b/src/util/virportallocator.c
@@ -43,6 +43,8 @@ struct _virPortAllocator {
 
     unsigned short start;
     unsigned short end;
+
+    unsigned int flags;
 };
 
 static virClassPtr virPortAllocatorClass;
@@ -71,7 +73,8 @@ VIR_ONCE_GLOBAL_INIT(virPortAllocator)
 
 virPortAllocatorPtr virPortAllocatorNew(const char *name,
                                         unsigned short start,
-                                        unsigned short end)
+                                        unsigned short end,
+                                        unsigned int flags)
 {
     virPortAllocatorPtr pa;
 
@@ -87,6 +90,7 @@ virPortAllocatorPtr virPortAllocatorNew(const char *name,
     if (!(pa = virObjectLockableNew(virPortAllocatorClass)))
         return NULL;
 
+    pa->flags = flags;
     pa->start = start;
     pa->end = end;
 
@@ -193,9 +197,11 @@ int virPortAllocatorAcquire(virPortAllocatorPtr pa,
         if (used)
             continue;
 
-        if (virPortAllocatorBindToPort(&v6used, i, AF_INET6) < 0 ||
-            virPortAllocatorBindToPort(&used, i, AF_INET) < 0)
-            goto cleanup;
+        if (!(pa->flags & VIR_PORT_ALLOCATOR_SKIP_BIND_CHECK)) {
+            if (virPortAllocatorBindToPort(&v6used, i, AF_INET6) < 0 ||
+                virPortAllocatorBindToPort(&used, i, AF_INET) < 0)
+                goto cleanup;
+        }
 
         if (!used && !v6used) {
             /* Add port to bitmap of reserved ports */
diff --git a/src/util/virportallocator.h b/src/util/virportallocator.h
index e5ee56d..14c3b24 100644
--- a/src/util/virportallocator.h
+++ b/src/util/virportallocator.h
@@ -28,9 +28,14 @@
 typedef struct _virPortAllocator virPortAllocator;
 typedef virPortAllocator *virPortAllocatorPtr;
 
+typedef enum {
+    VIR_PORT_ALLOCATOR_SKIP_BIND_CHECK = (1 << 0),
+} virPortAllocatorFlags;
+
 virPortAllocatorPtr virPortAllocatorNew(const char *name,
                                         unsigned short start,
-                                        unsigned short end);
+                                        unsigned short end,
+                                        unsigned int flags);
 
 int virPortAllocatorAcquire(virPortAllocatorPtr pa,
                             unsigned short *port);
diff --git a/tests/virportallocatortest.c b/tests/virportallocatortest.c
index 48d2c9a..96d2ade 100644
--- a/tests/virportallocatortest.c
+++ b/tests/virportallocatortest.c
@@ -122,7 +122,7 @@ VIR_LOG_INIT("tests.portallocatortest");
 
 static int testAllocAll(const void *args ATTRIBUTE_UNUSED)
 {
-    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5909);
+    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5909, 0);
     int ret = -1;
     unsigned short p1, p2, p3, p4, p5, p6, p7;
 
@@ -193,7 +193,7 @@ static int testAllocAll(const void *args ATTRIBUTE_UNUSED)
 
 static int testAllocReuse(const void *args ATTRIBUTE_UNUSED)
 {
-    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5910);
+    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5910, 0);
     int ret = -1;
     unsigned short p1, p2, p3, p4;
 
-- 
1.8.4.5


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