[PATCH 2/3] qemu_capabilities: Added capabilites for qemu's "rss" and "hash".

[Andrew Melnychenko <andrew@xxxxxxxxxx>]

Added qemu's property check for virtio-net.
And added capability QEMU_CAPS_VIRTIO_RSS.
With "rss" and "rss_hash_report" from domain config,
qemu should enable "rss" and "hash" for virtio-net.
If domain config contains "rss" and/or "rss_hash_report" options for driver.
Libvirt will create an NIC device command line with enabled "rss"/"hash".

Signed-off-by: Andrew Melnychenko <andrew@xxxxxxxxxx>
---
 src/qemu/qemu_capabilities.c |  2 ++
 src/qemu/qemu_capabilities.h |  1 +
 src/qemu/qemu_command.c      |  2 ++
 src/qemu/qemu_validate.c     | 16 ++++++++++++++++
 4 files changed, 21 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 4f63322a9e..c36a0b22e1 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -653,6 +653,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "query-dirty-rate", /* QEMU_CAPS_QUERY_DIRTY_RATE */
               "rbd-encryption", /* QEMU_CAPS_RBD_ENCRYPTION */
               "sev-guest-kernel-hashes", /* QEMU_CAPS_SEV_GUEST_KERNEL_HASHES */
+              "virtio-net.rss", /* QEMU_CAPS_VIRTIO_RSS */
     );
 
 
@@ -1410,6 +1411,7 @@ static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsVirtioNet[] = {
     { "failover", QEMU_CAPS_VIRTIO_NET_FAILOVER, NULL },
     { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES, NULL },
     { "acpi-index", QEMU_CAPS_ACPI_INDEX, NULL },
+    { "rss", QEMU_CAPS_VIRTIO_RSS, NULL },
 };
 
 static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsPCIeRootPort[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index aaac20a834..916a087169 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -632,6 +632,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_QUERY_DIRTY_RATE, /* accepts query-dirty-rate */
     QEMU_CAPS_RBD_ENCRYPTION, /* Ceph RBD encryption support */
     QEMU_CAPS_SEV_GUEST_KERNEL_HASHES, /* sev-guest.kernel-hashes= */
+    QEMU_CAPS_VIRTIO_RSS, /* virtio-net rss feature */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d822533ccb..dfe6eefd1e 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4168,6 +4168,8 @@ qemuBuildNicDevProps(virDomainDef *def,
                                   "P:vectors", vectors,
                                   "p:rx_queue_size", net->driver.virtio.rx_queue_size,
                                   "p:tx_queue_size", net->driver.virtio.tx_queue_size,
+                                  "T:rss", net->driver.virtio.rss,
+                                  "T:hash", net->driver.virtio.rss_hash_report,
                                   "p:host_mtu", net->mtu,
                                   "T:failover", failover,
                                   NULL) < 0)
diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index 3a69733f81..399f5aa78f 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -1743,6 +1743,22 @@ qemuValidateDomainDeviceDefNetwork(const virDomainNetDef *net,
             }
         }
 
+        if (net->driver.virtio.rss &&
+            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_RSS)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("virtio rss is not supported with this "
+                             "QEMU binary"));
+            return -1;
+        }
+
+        if (net->driver.virtio.rss_hash_report &&
+            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_RSS)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("virtio rss hash report is not supported with this "
+                             "QEMU binary"));
+            return -1;
+        }
+
         if (net->mtu &&
             !virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_NET_HOST_MTU)) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-- 
2.34.1