From a227ab852ae92c9036e5748ec1b1d2a09229a75b Mon Sep 17 00:00:00 2001
From: Sebastien Boeuf <sebastien.boeuf@intel.com>
Date: Fri, 14 Dec 2018 15:11:44 -0800
Subject: [PATCH] virtcontainers: hypervisor: Add capability regarding
 multiqueue support

Each hypervisor is different and supports different options regarding
the network interface it creates. In particular, the multiqueue option
is not supported by Firecracker and should not be assumed by default.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
---
 virtcontainers/capabilities.go   | 12 ++++++++++++
 virtcontainers/qemu_amd64.go     |  2 ++
 virtcontainers/qemu_arch_base.go |  1 +
 virtcontainers/qemu_ppc64le.go   |  2 ++
 4 files changed, 17 insertions(+)

diff --git a/virtcontainers/capabilities.go b/virtcontainers/capabilities.go
index 8760c9969..6eb34c3b8 100644
--- a/virtcontainers/capabilities.go
+++ b/virtcontainers/capabilities.go
@@ -8,6 +8,7 @@ package virtcontainers
 const (
 	blockDeviceSupport = 1 << iota
 	blockDeviceHotplugSupport
+	multiQueueSupport
 )
 
 type capabilities struct {
@@ -35,3 +36,14 @@ func (caps *capabilities) isBlockDeviceHotplugSupported() bool {
 func (caps *capabilities) setBlockDeviceHotplugSupport() {
 	caps.flags |= blockDeviceHotplugSupport
 }
+
+func (caps *capabilities) isMultiQueueSupported() bool {
+	if caps.flags&multiQueueSupport != 0 {
+		return true
+	}
+	return false
+}
+
+func (caps *capabilities) setMultiQueueSupport() {
+	caps.flags |= multiQueueSupport
+}
diff --git a/virtcontainers/qemu_amd64.go b/virtcontainers/qemu_amd64.go
index 5eb002ff2..8dfddde93 100644
--- a/virtcontainers/qemu_amd64.go
+++ b/virtcontainers/qemu_amd64.go
@@ -108,6 +108,8 @@ func (q *qemuAmd64) capabilities() capabilities {
 		caps.setBlockDeviceHotplugSupport()
 	}
 
+	caps.setMultiQueueSupport()
+
 	return caps
 }
 
diff --git a/virtcontainers/qemu_arch_base.go b/virtcontainers/qemu_arch_base.go
index 63f506553..864edfe37 100644
--- a/virtcontainers/qemu_arch_base.go
+++ b/virtcontainers/qemu_arch_base.go
@@ -237,6 +237,7 @@ func (q *qemuArchBase) kernelParameters(debug bool) []Param {
 func (q *qemuArchBase) capabilities() capabilities {
 	var caps capabilities
 	caps.setBlockDeviceHotplugSupport()
+	caps.setMultiQueueSupport()
 	return caps
 }
 
diff --git a/virtcontainers/qemu_ppc64le.go b/virtcontainers/qemu_ppc64le.go
index 6b5d8b654..05d37ce75 100644
--- a/virtcontainers/qemu_ppc64le.go
+++ b/virtcontainers/qemu_ppc64le.go
@@ -94,6 +94,8 @@ func (q *qemuPPC64le) capabilities() capabilities {
 		caps.setBlockDeviceHotplugSupport()
 	}
 
+	caps.setMultiQueueSupport()
+
 	return caps
 }