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[libvirt PATCH v4 1/6] conf: Add support for vDPA network devices



This patch adds new schema and adds support for parsing and formatting
domain configurations that include vdpa devices.

vDPA network devices allow high-performance networking in a virtual
machine by providing a wire-speed data path. These devices require a
vendor-specific host driver but the data path follows the virtio
specification.

When a device on the host is bound to an appropriate vendor-specific
driver, it will create a chardev on the host at e.g.  /dev/vhost-vdpa-0.
That chardev path can then be used to define a new interface with
type='vdpa'.

Signed-off-by: Jonathon Jongsma <jjongsma redhat com>
---
 docs/formatdomain.rst            | 24 ++++++++++++++++++++++++
 docs/schemas/domaincommon.rng    | 15 +++++++++++++++
 src/conf/domain_conf.c           | 31 +++++++++++++++++++++++++++++++
 src/conf/domain_conf.h           |  4 ++++
 src/conf/netdev_bandwidth_conf.c |  1 +
 src/libxl/libxl_conf.c           |  1 +
 src/libxl/xen_common.c           |  1 +
 src/lxc/lxc_controller.c         |  1 +
 src/lxc/lxc_driver.c             |  3 +++
 src/lxc/lxc_process.c            |  1 +
 src/qemu/qemu_command.c          |  3 +++
 src/qemu/qemu_domain.c           |  4 +++-
 src/qemu/qemu_hotplug.c          |  3 +++
 src/qemu/qemu_interface.c        |  2 ++
 src/qemu/qemu_process.c          |  2 ++
 src/qemu/qemu_validate.c         |  1 +
 src/vmx/vmx.c                    |  1 +
 tools/virsh-domain.c             |  1 +
 18 files changed, 98 insertions(+), 1 deletion(-)

diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index 888db5ea29..b0c2b43dc2 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -4643,6 +4643,30 @@ or stopping the guest.
    </devices>
    ...
 
+:anchor:`<a id="elementsNICSVDPA"/>`
+
+vDPA devices
+^^^^^^^^^^^^
+
+A vDPA network device can be used to provide wire speed network performance
+within a domain. A vDPA device is a specialized type of network device that
+uses a datapath that complies with the virtio specification but has a
+vendor-specific control path.  To use such a device with libvirt, the host
+device must already be bound to the appropriate device-specific vDPA driver.
+This creates a vDPA char device (e.g. /dev/vhost-vdpa-0) that can be used to
+assign the device to a libvirt domain.  :since:`Since 6.8.0 (QEMU only,
+requires QEMU 5.1.0 or newer)`
+
+::
+
+   ...
+   <devices>
+     <interface type='vdpa'>
+       <source dev='/dev/vhost-vdpa-0'/>
+     </interface>
+   </devices>
+   ...
+
 :anchor:`<a id="elementsTeaming"/>`
 
 Teaming a virtio/hostdev NIC pair
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 4b7e460148..4ce485a762 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -3117,6 +3117,21 @@
             <ref name="interface-options"/>
           </interleave>
         </group>
+
+        <group>
+          <attribute name="type">
+            <value>vdpa</value>
+          </attribute>
+          <interleave>
+            <element name="source">
+              <attribute name="dev">
+                <ref name="deviceName"/>
+              </attribute>
+            </element>
+            <ref name="interface-options"/>
+          </interleave>
+        </group>
+
       </choice>
       <optional>
         <attribute name="trustGuestRxFilters">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index a91dbd4aa9..0b78ff7c70 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -554,6 +554,7 @@ VIR_ENUM_IMPL(virDomainNet,
               "direct",
               "hostdev",
               "udp",
+              "vdpa",
 );
 
 VIR_ENUM_IMPL(virDomainNetModel,
@@ -2505,6 +2506,10 @@ virDomainNetDefClear(virDomainNetDefPtr def)
         def->data.vhostuser = NULL;
         break;
 
+    case VIR_DOMAIN_NET_TYPE_VDPA:
+        VIR_FREE(def->data.vdpa.devicepath);
+        break;
+
     case VIR_DOMAIN_NET_TYPE_SERVER:
     case VIR_DOMAIN_NET_TYPE_CLIENT:
     case VIR_DOMAIN_NET_TYPE_MCAST:
@@ -12133,6 +12138,10 @@ virDomainNetDefParseXML(virDomainXMLOptionPtr xmlopt,
                 if (virDomainChrSourceReconnectDefParseXML(&reconnect, cur, ctxt) < 0)
                     goto error;
 
+            } else if (!dev
+                       && def->type == VIR_DOMAIN_NET_TYPE_VDPA
+                       && virXMLNodeNameEqual(cur, "source")) {
+                dev = virXMLPropString(cur, "dev");
             } else if (!def->virtPortProfile
                        && virXMLNodeNameEqual(cur, "virtualport")) {
                 if (def->type == VIR_DOMAIN_NET_TYPE_NETWORK) {
@@ -12390,6 +12399,16 @@ virDomainNetDefParseXML(virDomainXMLOptionPtr xmlopt,
         }
         break;
 
+    case VIR_DOMAIN_NET_TYPE_VDPA:
+        if (dev == NULL) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("No <source> 'dev' attribute "
+                             "specified with <interface type='vdpa'/>"));
+            goto error;
+        }
+        def->data.vdpa.devicepath = g_steal_pointer(&dev);
+        break;
+
     case VIR_DOMAIN_NET_TYPE_BRIDGE:
         if (bridge == NULL) {
             virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -12779,6 +12798,7 @@ virDomainNetDefParseXML(virDomainXMLOptionPtr xmlopt,
         case VIR_DOMAIN_NET_TYPE_DIRECT:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
         case VIR_DOMAIN_NET_TYPE_UDP:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
             break;
         case VIR_DOMAIN_NET_TYPE_LAST:
         default:
@@ -26947,6 +26967,14 @@ virDomainNetDefFormat(virBufferPtr buf,
             }
             break;
 
+        case VIR_DOMAIN_NET_TYPE_VDPA:
+           if (def->data.vdpa.devicepath) {
+               virBufferEscapeString(buf, "<source dev='%s'",
+                                     def->data.vdpa.devicepath);
+               sourceLines++;
+           }
+            break;
+
         case VIR_DOMAIN_NET_TYPE_USER:
         case VIR_DOMAIN_NET_TYPE_LAST:
             break;
@@ -31160,6 +31188,7 @@ virDomainNetGetActualVirtPortProfile(const virDomainNetDef *iface)
     case VIR_DOMAIN_NET_TYPE_MCAST:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
     default:
         return NULL;
@@ -31992,6 +32021,7 @@ virDomainNetTypeSharesHostView(const virDomainNetDef *net)
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         break;
     }
@@ -32256,6 +32286,7 @@ virDomainNetDefActualToNetworkPort(virDomainDefPtr dom,
     case VIR_DOMAIN_NET_TYPE_UDP:
     case VIR_DOMAIN_NET_TYPE_USER:
     case VIR_DOMAIN_NET_TYPE_VHOSTUSER:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Unexpected network port type %s"),
                        virDomainNetTypeToString(virDomainNetGetActualType(iface)));
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 8f1662aae0..da35aa6c2d 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -883,6 +883,7 @@ typedef enum {
     VIR_DOMAIN_NET_TYPE_DIRECT,
     VIR_DOMAIN_NET_TYPE_HOSTDEV,
     VIR_DOMAIN_NET_TYPE_UDP,
+    VIR_DOMAIN_NET_TYPE_VDPA,
 
     VIR_DOMAIN_NET_TYPE_LAST
 } virDomainNetType;
@@ -1056,6 +1057,9 @@ struct _virDomainNetDef {
              */
             virDomainActualNetDefPtr actual;
         } network;
+        struct {
+            char *devicepath;
+        } vdpa;
         struct {
             char *brname;
         } bridge;
diff --git a/src/conf/netdev_bandwidth_conf.c b/src/conf/netdev_bandwidth_conf.c
index 396ac62019..4eb12e2951 100644
--- a/src/conf/netdev_bandwidth_conf.c
+++ b/src/conf/netdev_bandwidth_conf.c
@@ -315,6 +315,7 @@ bool virNetDevSupportsBandwidth(virDomainNetType type)
     case VIR_DOMAIN_NET_TYPE_UDP:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         break;
     }
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 5b729a019a..b570a5a167 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -1391,6 +1391,7 @@ libxlMakeNic(virDomainDefPtr def,
         case VIR_DOMAIN_NET_TYPE_INTERNAL:
         case VIR_DOMAIN_NET_TYPE_DIRECT:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
         case VIR_DOMAIN_NET_TYPE_LAST:
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                     _("unsupported interface type %s"),
diff --git a/src/libxl/xen_common.c b/src/libxl/xen_common.c
index 56702a2a76..183b09671a 100644
--- a/src/libxl/xen_common.c
+++ b/src/libxl/xen_common.c
@@ -1792,6 +1792,7 @@ xenFormatNet(virConnectPtr conn,
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
     case VIR_DOMAIN_NET_TYPE_UDP:
     case VIR_DOMAIN_NET_TYPE_USER:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, _("Unsupported net type '%s'"),
                        virDomainNetTypeToString(net->type));
         return -1;
diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index c3cf485e2c..9f944dec74 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -422,6 +422,7 @@ static int virLXCControllerGetNICIndexes(virLXCControllerPtr ctrl)
         case VIR_DOMAIN_NET_TYPE_UDP:
         case VIR_DOMAIN_NET_TYPE_INTERNAL:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("Unsupported net type %s"),
                            virDomainNetTypeToString(actualType));
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index a530488dd2..4d3c5d9f63 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -3504,6 +3504,7 @@ lxcDomainAttachDeviceNetLive(virLXCDriverPtr driver,
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                        _("Network device type is not supported"));
         goto cleanup;
@@ -3558,6 +3559,7 @@ lxcDomainAttachDeviceNetLive(virLXCDriverPtr driver,
         case VIR_DOMAIN_NET_TYPE_INTERNAL:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
         case VIR_DOMAIN_NET_TYPE_UDP:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
         case VIR_DOMAIN_NET_TYPE_LAST:
         default:
             /* no-op */
@@ -3999,6 +4001,7 @@ lxcDomainDetachDeviceNetLive(virDomainObjPtr vm,
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                        _("Only bridged veth devices can be detached"));
         goto cleanup;
diff --git a/src/lxc/lxc_process.c b/src/lxc/lxc_process.c
index 16969dbf33..d103ec6666 100644
--- a/src/lxc/lxc_process.c
+++ b/src/lxc/lxc_process.c
@@ -606,6 +606,7 @@ virLXCProcessSetupInterfaces(virLXCDriverPtr driver,
         case VIR_DOMAIN_NET_TYPE_INTERNAL:
         case VIR_DOMAIN_NET_TYPE_LAST:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("Unsupported network type %s"),
                            virDomainNetTypeToString(type));
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 91b59538aa..a9367f7758 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3692,6 +3692,7 @@ qemuBuildHostNetStr(virDomainNetDefPtr net,
             return NULL;
         break;
 
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
         /* Should have been handled earlier via PCI/USB hotplug code. */
     case VIR_DOMAIN_NET_TYPE_LAST:
@@ -8132,6 +8133,7 @@ qemuBuildInterfaceCommandLine(virQEMUDriverPtr driver,
     case VIR_DOMAIN_NET_TYPE_MCAST:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         /* nada */
         break;
@@ -8168,6 +8170,7 @@ qemuBuildInterfaceCommandLine(virQEMUDriverPtr driver,
     case VIR_DOMAIN_NET_TYPE_UDP:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
        /* These types don't use a network device on the host, but
         * instead use some other type of connection to the emulated
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 279de2997d..fe80fa9aed 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -5129,7 +5129,8 @@ qemuDomainDeviceNetDefPostParse(virDomainNetDefPtr net,
                                 const virDomainDef *def,
                                 virQEMUCapsPtr qemuCaps)
 {
-    if (net->type != VIR_DOMAIN_NET_TYPE_HOSTDEV &&
+    if (net->type != VIR_DOMAIN_NET_TYPE_VDPA &&
+        net->type != VIR_DOMAIN_NET_TYPE_HOSTDEV &&
         !virDomainNetGetModelString(net) &&
         virDomainNetResolveActualType(net) != VIR_DOMAIN_NET_TYPE_HOSTDEV)
         net->model = qemuDomainDefaultNetModel(def, qemuCaps);
@@ -9323,6 +9324,7 @@ qemuDomainNetSupportsMTU(virDomainNetType type)
     case VIR_DOMAIN_NET_TYPE_DIRECT:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         break;
     }
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index fc0866c011..ade77330ff 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1340,6 +1340,7 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
     case VIR_DOMAIN_NET_TYPE_MCAST:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
                        _("hotplug of interface type of %s is not implemented yet"),
@@ -3390,6 +3391,7 @@ qemuDomainChangeNetFilter(virDomainObjPtr vm,
     case VIR_DOMAIN_NET_TYPE_DIRECT:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("filters not supported on interfaces of type %s"),
                        virDomainNetTypeToString(virDomainNetGetActualType(newdev)));
@@ -3727,6 +3729,7 @@ qemuDomainChangeNet(virQEMUDriverPtr driver,
 
         case VIR_DOMAIN_NET_TYPE_VHOSTUSER:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
             virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
                            _("unable to change config on '%s' network type"),
                            virDomainNetTypeToString(newdev->type));
diff --git a/src/qemu/qemu_interface.c b/src/qemu/qemu_interface.c
index cbf3d99981..b24f9060a9 100644
--- a/src/qemu/qemu_interface.c
+++ b/src/qemu/qemu_interface.c
@@ -118,6 +118,7 @@ qemuInterfaceStartDevice(virDomainNetDefPtr net)
     case VIR_DOMAIN_NET_TYPE_UDP:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         /* these types all require no action */
         break;
@@ -203,6 +204,7 @@ qemuInterfaceStopDevice(virDomainNetDefPtr net)
     case VIR_DOMAIN_NET_TYPE_UDP:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_HOSTDEV:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         /* these types all require no action */
         break;
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index f21b8f1585..b32b9fe20a 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3363,6 +3363,7 @@ qemuProcessNotifyNets(virDomainDefPtr def)
         case VIR_DOMAIN_NET_TYPE_INTERNAL:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
         case VIR_DOMAIN_NET_TYPE_UDP:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
         case VIR_DOMAIN_NET_TYPE_LAST:
             break;
         }
@@ -7591,6 +7592,7 @@ void qemuProcessStop(virQEMUDriverPtr driver,
         case VIR_DOMAIN_NET_TYPE_INTERNAL:
         case VIR_DOMAIN_NET_TYPE_HOSTDEV:
         case VIR_DOMAIN_NET_TYPE_UDP:
+        case VIR_DOMAIN_NET_TYPE_VDPA:
         case VIR_DOMAIN_NET_TYPE_LAST:
             /* No special cleanup procedure for these types. */
             break;
diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index 3ed4039cdf..1c803c98f7 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -1145,6 +1145,7 @@ qemuValidateNetSupportsCoalesce(virDomainNetType type)
     case VIR_DOMAIN_NET_TYPE_MCAST:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_LAST:
         break;
     }
diff --git a/src/vmx/vmx.c b/src/vmx/vmx.c
index 4b1b04c6e1..6e0fd61f60 100644
--- a/src/vmx/vmx.c
+++ b/src/vmx/vmx.c
@@ -3833,6 +3833,7 @@ virVMXFormatEthernet(virDomainNetDefPtr def, int controller,
       case VIR_DOMAIN_NET_TYPE_DIRECT:
       case VIR_DOMAIN_NET_TYPE_HOSTDEV:
       case VIR_DOMAIN_NET_TYPE_UDP:
+      case VIR_DOMAIN_NET_TYPE_VDPA:
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, _("Unsupported net type '%s'"),
                        virDomainNetTypeToString(def->type));
         return -1;
diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 32edfc0398..ef2a353aab 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -1007,6 +1007,7 @@ cmdAttachInterface(vshControl *ctl, const vshCmd *cmd)
     case VIR_DOMAIN_NET_TYPE_CLIENT:
     case VIR_DOMAIN_NET_TYPE_MCAST:
     case VIR_DOMAIN_NET_TYPE_UDP:
+    case VIR_DOMAIN_NET_TYPE_VDPA:
     case VIR_DOMAIN_NET_TYPE_INTERNAL:
     case VIR_DOMAIN_NET_TYPE_LAST:
         vshError(ctl, _("No support for %s in command 'attach-interface'"),
-- 
2.26.2


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