[PATCH 1/7] net/vmnet: dependencies setup, initial preparations

[Vladislav Yaroshchuk <yaroshchuk2000@gmail.com>]

Add 'vmnet' customizable option and 'vmnet.framework' probe into
configure;

Create source files for network client driver, update meson.build;

Add 'vmnet' into qapi::net::NetClientDriver options list.

Signed-off-by: Vladislav Yaroshchuk <yaroshchuk2000@gmail.com>
---
 configure       | 31 +++++++++++++++++++++++++++++++
 meson.build     |  5 +++++
 net/clients.h   |  4 ++++
 net/meson.build |  1 +
 net/net.c       |  6 ++++++
 net/vmnet.c     | 22 ++++++++++++++++++++++
 qapi/net.json   |  3 ++-
 7 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 net/vmnet.c

diff --git a/configure b/configure
index 8dcb9965b2..cdc171988b 100755
--- a/configure
+++ b/configure
@@ -307,6 +307,7 @@ mpath="auto"
 vnc="enabled"
 sparse="auto"
 vde="$default_feature"
+vmnet="auto"
 vnc_sasl="auto"
 vnc_jpeg="auto"
 vnc_png="auto"
@@ -1059,6 +1060,10 @@ for opt do
   ;;
   --enable-vde) vde="yes"
   ;;
+  --disable-vmnet) vmnet="no"
+  ;;
+  --enable-vmnet) vmnet="yes"
+  ;;
   --disable-netmap) netmap="no"
   ;;
   --enable-netmap) netmap="yes"
@@ -1871,6 +1876,7 @@ disabled with --disable-FEATURE, default is enabled if available
   rdma            Enable RDMA-based migration
   pvrdma          Enable PVRDMA support
   vde             support for vde network
+  vmnet           vmnet.framework support (macOS)
   netmap          support for netmap network
   linux-aio       Linux AIO support
   linux-io-uring  Linux io_uring support
@@ -3157,6 +3163,28 @@ EOF
   fi
 fi
 
+##########################################
+# vmnet.framework probe
+if test "$vmnet" != "no" ; then
+  vmnet_flags="-framework vmnet"
+  cat > $TMPC << EOF
+#include <vmnet/vmnet.h>
+int main(void)
+{
+    (void) vmnet_allocate_mac_address_key;
+    return 0;
+}
+EOF
+  if compile_prog "" "$vmnet_flags" ; then
+    vmnet=yes
+  else
+    if test "$vmnet" = "yes" ; then
+      feature_not_found "vmnet" "'vmnet.framework' in unsupported in this build"
+    fi
+    vmnet=no
+  fi
+fi
+
 ##########################################
 # netmap support probe
 # Apart from looking for netmap headers, we make sure that the host API version
@@ -5559,6 +5587,9 @@ if test "$vde" = "yes" ; then
   echo "CONFIG_VDE=y" >> $config_host_mak
   echo "VDE_LIBS=$vde_libs" >> $config_host_mak
 fi
+if test "$vmnet" = "yes" ; then
+  echo "CONFIG_VMNET=y" >> $config_host_mak
+fi
 if test "$netmap" = "yes" ; then
   echo "CONFIG_NETMAP=y" >> $config_host_mak
 fi
diff --git a/meson.build b/meson.build
index a2311eda6e..df254522af 100644
--- a/meson.build
+++ b/meson.build
@@ -173,6 +173,7 @@ iokit = []
 emulator_link_args = []
 nvmm =not_found
 hvf = not_found
+vmnet = not_found
 if targetos == 'windows'
   socket = cc.find_library('ws2_32')
   winmm = cc.find_library('winmm')
@@ -184,6 +185,9 @@ if targetos == 'windows'
 elif targetos == 'darwin'
   coref = dependency('appleframeworks', modules: 'CoreFoundation')
   iokit = dependency('appleframeworks', modules: 'IOKit')
+  if config_host.has_key('CONFIG_VMNET')
+    vmnet = dependency('appleframeworks', modules: 'vmnet')
+  endif
 elif targetos == 'sunos'
   socket = [cc.find_library('socket'),
             cc.find_library('nsl'),
@@ -2522,6 +2526,7 @@ summary_info += {'vhost-user support': config_host.has_key('CONFIG_VHOST_USER')}
 summary_info += {'vhost-user-blk server support': have_vhost_user_blk_server}
 summary_info += {'vhost-user-fs support': config_host.has_key('CONFIG_VHOST_USER_FS')}
 summary_info += {'vhost-vdpa support': config_host.has_key('CONFIG_VHOST_VDPA')}
+summary_info += {'vmnet support': vmnet.found()}
 summary_info += {'build guest agent': config_host.has_key('CONFIG_GUEST_AGENT')}
 summary(summary_info, bool_yn: true, section: 'Configurable features')
 
diff --git a/net/clients.h b/net/clients.h
index 92f9b59aed..ac19843aab 100644
--- a/net/clients.h
+++ b/net/clients.h
@@ -63,4 +63,8 @@ int net_init_vhost_user(const Netdev *netdev, const char *name,
 
 int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
                         NetClientState *peer, Error **errp);
+#ifdef CONFIG_VMNET
+int net_init_vmnet(const Netdev *netdev, const char *name,
+                          NetClientState *peer, Error **errp);
+#endif
 #endif /* QEMU_NET_CLIENTS_H */
diff --git a/net/meson.build b/net/meson.build
index 1076b0a7ab..196cf321a2 100644
--- a/net/meson.build
+++ b/net/meson.build
@@ -38,4 +38,5 @@ softmmu_ss.add(when: 'CONFIG_POSIX', if_true: files(tap_posix))
 softmmu_ss.add(when: 'CONFIG_WIN32', if_true: files('tap-win32.c'))
 softmmu_ss.add(when: 'CONFIG_VHOST_NET_VDPA', if_true: files('vhost-vdpa.c'))
 
+softmmu_ss.add(when: ['CONFIG_VMNET', vmnet], if_true: files('vmnet.c'))
 subdir('can')
diff --git a/net/net.c b/net/net.c
index 76bbb7c31b..645c52ef6e 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1001,6 +1001,9 @@ static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
 #ifdef CONFIG_L2TPV3
         [NET_CLIENT_DRIVER_L2TPV3]    = net_init_l2tpv3,
 #endif
+#ifdef CONFIG_VMNET
+        [NET_CLIENT_DRIVER_VMNET] = net_init_vmnet,
+#endif
 };
 
 
@@ -1086,6 +1089,9 @@ void show_netdevs(void)
 #endif
 #ifdef CONFIG_VHOST_VDPA
         "vhost-vdpa",
+#endif
+#ifdef CONFIG_VMNET
+        "vmnet",
 #endif
     };
 
diff --git a/net/vmnet.c b/net/vmnet.c
new file mode 100644
index 0000000000..f8b64e2a27
--- /dev/null
+++ b/net/vmnet.c
@@ -0,0 +1,22 @@
+/*
+ * vmnet.c - network client wrapper for Apple vmnet.framework
+ *
+ * Copyright(c) 2021 Vladislav Yaroshchuk <yaroshchuk2000@gmail.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "clients.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+
+#include <vmnet/vmnet.h>
+
+int net_init_vmnet(const Netdev *netdev, const char *name,
+                    NetClientState *peer, Error **errp) {
+  error_setg(errp, "vmnet is not implemented yet");
+  return -1;
+}
diff --git a/qapi/net.json b/qapi/net.json
index 7fab2e7cd8..c5de234e2c 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -460,10 +460,11 @@
 # Since: 2.7
 #
 #        @vhost-vdpa since 5.1
+#        @vmnet since 6.1
 ##
 { 'enum': 'NetClientDriver',
   'data': [ 'none', 'nic', 'user', 'tap', 'l2tpv3', 'socket', 'vde',
-            'bridge', 'hubport', 'netmap', 'vhost-user', 'vhost-vdpa' ] }
+            'bridge', 'hubport', 'netmap', 'vhost-user', 'vhost-vdpa', 'vmnet' ] }
 
 ##
 # @Netdev:
-- 
2.23.0