Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

pc, acpi, pci, virtio: fixes, cleanups, features, tests

Some fixes and cleanups. New tests.
Configurable tx queue size for virtio-net.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Mon 03 Jul 2017 20:43:17 BST
# gpg:                using RSA key 0x281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>"
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* remotes/mst/tags/for_upstream: (21 commits)
  i386/acpi: update expected acpi files
  virtio-net: fix tx queue size for !vhost-user
  tests: Add unit tests for the VM Generation ID feature
  vhost-user: unregister slave req handler at cleanup time
  vhost: ensure vhost_ops are set before calling iotlb callback
  intel_iommu: fix migration breakage on mr switch
  hw/acpi: remove dead acpi code
  fw_cfg: move setting of FW_CFG_VERSION_DMA bit to fw_cfg_init1()
  fw_cfg: don't map the fw_cfg IO ports in fw_cfg_io_realize()
  i386/kvm/pci-assign: Use errp directly rather than local_err
  i386/kvm/pci-assign: Fix return type of verify_irqchip_kernel()
  pci: Convert shpc_init() to Error
  pci: Convert to realize
  pci: Replace pci_add_capability2() with pci_add_capability()
  pci: Make errp the last parameter of pci_add_capability()
  pci: Fix the wrong assertion.
  pci: Add comment for pci_add_capability2()
  pci: Clean up error checking in pci_add_capability()
  intel_iommu: relax iq tail check on VTD_GCMD_QIE enable
  hw/pci-bridge/dec: Classify the DEC PCI bridge as bridge device
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 42 insertions, 2 deletions

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 91eddaf93b..5630a9ec44 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -34,8 +34,11 @@
 
 /* previously fixed value */
 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256
+#define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256
+
 /* for now, only allow larger queues; with virtio-1, guest can downsize */
 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
+#define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
 
 /*
  * Calculate the number of bytes up to and including the given 'field' of
@@ -495,6 +498,24 @@ static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
     }
 }
 
+static int virtio_net_max_tx_queue_size(VirtIONet *n)
+{
+    NetClientState *peer = n->nic_conf.peers.ncs[0];
+
+    /*
+     * Backends other than vhost-user don't support max queue size.
+     */
+    if (!peer) {
+        return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
+    }
+
+    if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) {
+        return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
+    }
+
+    return VIRTQUEUE_MAX_SIZE;
+}
+
 static int peer_attach(VirtIONet *n, int index)
 {
     NetClientState *nc = qemu_get_subqueue(n->nic, index);
@@ -1508,15 +1529,18 @@ static void virtio_net_add_queue(VirtIONet *n, int index)
 
     n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size,
                                            virtio_net_handle_rx);
+
     if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
         n->vqs[index].tx_vq =
-            virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
+            virtio_add_queue(vdev, n->net_conf.tx_queue_size,
+                             virtio_net_handle_tx_timer);
         n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
                                               virtio_net_tx_timer,
                                               &n->vqs[index]);
     } else {
         n->vqs[index].tx_vq =
-            virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
+            virtio_add_queue(vdev, n->net_conf.tx_queue_size,
+                             virtio_net_handle_tx_bh);
         n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]);
     }
 
@@ -1927,6 +1951,17 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE ||
+        n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE ||
+        !is_power_of_2(n->net_conf.tx_queue_size)) {
+        error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), "
+                   "must be a power of 2 between %d and %d",
+                   n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE,
+                   VIRTQUEUE_MAX_SIZE);
+        virtio_cleanup(vdev);
+        return;
+    }
+
     n->max_queues = MAX(n->nic_conf.peers.queues, 1);
     if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
         error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
@@ -1947,6 +1982,9 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
         error_report("Defaulting to \"bh\"");
     }
 
+    n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
+                                    n->net_conf.tx_queue_size);
+
     for (i = 0; i < n->max_queues; i++) {
         virtio_net_add_queue(n, i);
     }
@@ -2106,6 +2144,8 @@ static Property virtio_net_properties[] = {
     DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
     DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
                        VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
+    DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size,
+                       VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE),
     DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
     DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
                      true),