From: Stefan Hajnoczi <stefanha@redhat.com>
To: qemu-devel@nongnu.org
Cc: Fam Zheng <fam@euphon.net>,
Peter Maydell <peter.maydell@linaro.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Max Reitz <mreitz@redhat.com>,
qemu-block@nongnu.org, David Hildenbrand <david@redhat.com>,
Halil Pasic <pasic@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Richard Henderson <rth@twiddle.net>,
Thomas Huth <thuth@redhat.com>,
Eduardo Habkost <ehabkost@redhat.com>,
qemu-s390x@nongnu.org, qemu-arm@nongnu.org,
Stefan Hajnoczi <stefanha@redhat.com>,
David Gibson <david@gibson.dropbear.id.au>,
Kevin Wolf <kwolf@redhat.com>,
Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
cohuck@redhat.com, Raphael Norwitz <raphael.norwitz@nutanix.com>,
qemu-ppc@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>
Subject: [PATCH v6 5/7] virtio-scsi-pci: default num_queues to -smp N
Date: Tue, 18 Aug 2020 15:33:46 +0100 [thread overview]
Message-ID: <20200818143348.310613-6-stefanha@redhat.com> (raw)
In-Reply-To: <20200818143348.310613-1-stefanha@redhat.com>
Automatically size the number of virtio-scsi-pci, vhost-scsi-pci, and
vhost-user-scsi-pci request virtqueues to match the number of vCPUs.
Other transports continue to default to 1 request virtqueue.
A 1:1 virtqueue:vCPU mapping ensures that completion interrupts are
handled on the same vCPU that submitted the request. No IPI is
necessary to complete an I/O request and performance is improved. The
maximum number of MSI-X vectors and virtqueues limit are respected.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
include/hw/virtio/virtio-scsi.h | 2 ++
hw/core/machine.c | 3 +++
hw/scsi/vhost-scsi.c | 3 ++-
hw/scsi/vhost-user-scsi.c | 3 ++-
hw/scsi/virtio-scsi.c | 6 +++++-
hw/virtio/vhost-scsi-pci.c | 10 +++++++---
hw/virtio/vhost-user-scsi-pci.c | 10 +++++++---
hw/virtio/virtio-scsi-pci.c | 10 +++++++---
8 files changed, 35 insertions(+), 12 deletions(-)
diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
index 9f293bcb80..c0b8e4dd7e 100644
--- a/include/hw/virtio/virtio-scsi.h
+++ b/include/hw/virtio/virtio-scsi.h
@@ -39,6 +39,8 @@
/* Number of virtqueues that are always present */
#define VIRTIO_SCSI_VQ_NUM_FIXED 2
+#define VIRTIO_SCSI_AUTO_NUM_QUEUES UINT32_MAX
+
typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq;
typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp;
typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq;
diff --git a/hw/core/machine.c b/hw/core/machine.c
index a6f7e4e8d7..9ee2aa0f7b 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -29,6 +29,9 @@
#include "migration/vmstate.h"
GlobalProperty hw_compat_5_1[] = {
+ { "vhost-scsi", "num_queues", "1"},
+ { "vhost-user-scsi", "num_queues", "1"},
+ { "virtio-scsi-device", "num_queues", "1"},
};
const size_t hw_compat_5_1_len = G_N_ELEMENTS(hw_compat_5_1);
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index 13b05af29b..a83ffeefc8 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -270,7 +270,8 @@ static Property vhost_scsi_properties[] = {
DEFINE_PROP_STRING("vhostfd", VirtIOSCSICommon, conf.vhostfd),
DEFINE_PROP_STRING("wwpn", VirtIOSCSICommon, conf.wwpn),
DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
- DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues,
+ VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size,
128),
DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSICommon, conf.seg_max_adjust,
diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c
index a8b821466f..7c0631656c 100644
--- a/hw/scsi/vhost-user-scsi.c
+++ b/hw/scsi/vhost-user-scsi.c
@@ -162,7 +162,8 @@ static void vhost_user_scsi_unrealize(DeviceState *dev)
static Property vhost_user_scsi_properties[] = {
DEFINE_PROP_CHR("chardev", VirtIOSCSICommon, conf.chardev),
DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
- DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues,
+ VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size,
128),
DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors,
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index eecdd05af5..3a71ea7097 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -891,6 +891,9 @@ void virtio_scsi_common_realize(DeviceState *dev,
virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI,
sizeof(VirtIOSCSIConfig));
+ if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ s->conf.num_queues = 1;
+ }
if (s->conf.num_queues == 0 ||
s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) {
error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
@@ -964,7 +967,8 @@ static void virtio_scsi_device_unrealize(DeviceState *dev)
}
static Property virtio_scsi_properties[] = {
- DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues, 1),
+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues,
+ VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI,
parent_obj.conf.virtqueue_size, 256),
DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI,
diff --git a/hw/virtio/vhost-scsi-pci.c b/hw/virtio/vhost-scsi-pci.c
index 06e814d30e..a6bb0dc60d 100644
--- a/hw/virtio/vhost-scsi-pci.c
+++ b/hw/virtio/vhost-scsi-pci.c
@@ -47,11 +47,15 @@ static void vhost_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VHostSCSIPCI *dev = VHOST_SCSI_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
- VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
+ VirtIOSCSIConf *conf = &dev->vdev.parent_obj.parent_obj.conf;
+
+ if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ conf->num_queues =
+ virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
+ }
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = vs->conf.num_queues +
- VIRTIO_SCSI_VQ_NUM_FIXED + 1;
+ vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
}
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
diff --git a/hw/virtio/vhost-user-scsi-pci.c b/hw/virtio/vhost-user-scsi-pci.c
index ab6dfb71a9..25e97ca54e 100644
--- a/hw/virtio/vhost-user-scsi-pci.c
+++ b/hw/virtio/vhost-user-scsi-pci.c
@@ -53,11 +53,15 @@ static void vhost_user_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
- VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
+ VirtIOSCSIConf *conf = &dev->vdev.parent_obj.parent_obj.conf;
+
+ if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ conf->num_queues =
+ virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
+ }
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = vs->conf.num_queues +
- VIRTIO_SCSI_VQ_NUM_FIXED + 1;
+ vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
}
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
diff --git a/hw/virtio/virtio-scsi-pci.c b/hw/virtio/virtio-scsi-pci.c
index 3ff9eb7ef6..fa4b3bfb50 100644
--- a/hw/virtio/virtio-scsi-pci.c
+++ b/hw/virtio/virtio-scsi-pci.c
@@ -46,13 +46,17 @@ static void virtio_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
- VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
DeviceState *proxy = DEVICE(vpci_dev);
+ VirtIOSCSIConf *conf = &dev->vdev.parent_obj.conf;
char *bus_name;
+ if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ conf->num_queues =
+ virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
+ }
+
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = vs->conf.num_queues +
- VIRTIO_SCSI_VQ_NUM_FIXED + 1;
+ vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
}
/*
--
2.26.2
next prev parent reply other threads:[~2020-08-18 15:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-18 14:33 [PATCH v6 0/7] virtio-pci: enable blk and scsi multi-queue by default Stefan Hajnoczi
2020-08-18 14:33 ` [PATCH v6 1/7] Open 5.2 development tree Stefan Hajnoczi
2020-08-19 14:13 ` Stefan Hajnoczi
2020-08-18 14:33 ` [PATCH v6 2/7] hw: add 5.2 machine types and 5.1 compat options Stefan Hajnoczi
2020-08-18 15:11 ` Cornelia Huck
2020-08-19 12:54 ` Igor Mammedov
2020-08-19 14:10 ` Cornelia Huck
2020-08-19 14:12 ` Stefan Hajnoczi
2020-08-19 14:38 ` Laszlo Ersek
2020-08-19 15:27 ` Philippe Mathieu-Daudé
2020-08-19 13:06 ` Igor Mammedov
2020-08-18 14:33 ` [PATCH v6 3/7] virtio-pci: add virtio_pci_optimal_num_queues() helper Stefan Hajnoczi
2020-08-18 14:33 ` [PATCH v6 4/7] virtio-scsi: introduce a constant for fixed virtqueues Stefan Hajnoczi
2020-08-18 14:33 ` Stefan Hajnoczi [this message]
2020-08-18 15:16 ` [PATCH v6 5/7] virtio-scsi-pci: default num_queues to -smp N Cornelia Huck
2020-08-23 2:10 ` Raphael Norwitz
2020-08-18 14:33 ` [PATCH v6 6/7] virtio-blk-pci: " Stefan Hajnoczi
2020-08-18 14:33 ` [PATCH v6 7/7] vhost-user-blk-pci: " Stefan Hajnoczi
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