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Mon, 27 Nov 2023 00:28:50 +0000 From: Mike Christie To: fam@euphon.net, stefanha@redhat.com, jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.org Cc: Mike Christie Subject: [PATCH v2 2/2] vhost-scsi: Add support for a worker thread per virtqueue Date: Sun, 26 Nov 2023 18:28:34 -0600 Message-Id: <20231127002834.8670-3-michael.christie@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231127002834.8670-1-michael.christie@oracle.com> References: <20231127002834.8670-1-michael.christie@oracle.com> X-ClientProxiedBy: DS7PR03CA0082.namprd03.prod.outlook.com (2603:10b6:5:3bb::27) To CY8PR10MB7243.namprd10.prod.outlook.com (2603:10b6:930:7c::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY8PR10MB7243:EE_|DM4PR10MB6863:EE_ X-MS-Office365-Filtering-Correlation-Id: d2e7c327-832c-4f66-1651-08dbeedfd3c0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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envelope-from=michael.christie@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This adds support for vhost-scsi to be able to create a worker thread per virtqueue. Right now for vhost-net we get a worker thread per tx/rx virtqueue pair which scales nicely as we add more virtqueues and CPUs, but for scsi we get the single worker thread that's shared by all virtqueues. When trying to send IO to more than 2 virtqueues the single thread becomes a bottlneck. This patch adds a new setting, workers_per_virtqueue, which can be set to: false: Existing behavior where we get the single worker thread. true: Create a worker per IO virtqueue. Signed-off-by: Mike Christie --- hw/scsi/vhost-scsi.c | 60 +++++++++++++++++++++++++++++++++ include/hw/virtio/virtio-scsi.h | 1 + 2 files changed, 61 insertions(+) diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c index 3126df9e1d9d..77eef9474c23 100644 --- a/hw/scsi/vhost-scsi.c +++ b/hw/scsi/vhost-scsi.c @@ -165,6 +165,57 @@ static const VMStateDescription vmstate_virtio_vhost_scsi = { .pre_save = vhost_scsi_pre_save, }; +static int vhost_scsi_set_workers(VHostSCSICommon *vsc, bool per_virtqueue) +{ + struct vhost_dev *dev = &vsc->dev; + struct vhost_vring_worker vq_worker; + struct vhost_worker_state worker; + int i, ret; + + /* Use default worker */ + if (!per_virtqueue || dev->nvqs == VHOST_SCSI_VQ_NUM_FIXED + 1) { + return 0; + } + + /* + * ctl/evt share the first worker since it will be rare for them + * to send cmds while IO is running. + */ + for (i = VHOST_SCSI_VQ_NUM_FIXED + 1; i < dev->nvqs; i++) { + memset(&worker, 0, sizeof(worker)); + + ret = dev->vhost_ops->vhost_new_worker(dev, &worker); + if (ret == -ENOTTY) { + /* + * worker ioctls are not implemented so just ignore and + * and continue device setup. + */ + ret = 0; + break; + } else if (ret) { + break; + } + + memset(&vq_worker, 0, sizeof(vq_worker)); + vq_worker.worker_id = worker.worker_id; + vq_worker.index = i; + + ret = dev->vhost_ops->vhost_attach_vring_worker(dev, &vq_worker); + if (ret == -ENOTTY) { + /* + * It's a bug for the kernel to have supported the worker creation + * ioctl but not attach. + */ + dev->vhost_ops->vhost_free_worker(dev, &worker); + break; + } else if (ret) { + break; + } + } + + return ret; +} + static void vhost_scsi_realize(DeviceState *dev, Error **errp) { VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); @@ -232,6 +283,13 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp) goto free_vqs; } + ret = vhost_scsi_set_workers(vsc, vs->conf.worker_per_virtqueue); + if (ret < 0) { + error_setg(errp, "vhost-scsi: vhost worker setup failed: %s", + strerror(-ret)); + goto free_vqs; + } + /* At present, channel and lun both are 0 for bootable vhost-scsi disk */ vsc->channel = 0; vsc->lun = 0; @@ -297,6 +355,8 @@ static Property vhost_scsi_properties[] = { VIRTIO_SCSI_F_T10_PI, false), DEFINE_PROP_BOOL("migratable", VHostSCSICommon, migratable, false), + DEFINE_PROP_BOOL("worker_per_virtqueue", VirtIOSCSICommon, + conf.worker_per_virtqueue, false), DEFINE_PROP_END_OF_LIST(), }; diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h index 779568ab5d28..0e9a1867665e 100644 --- a/include/hw/virtio/virtio-scsi.h +++ b/include/hw/virtio/virtio-scsi.h @@ -51,6 +51,7 @@ typedef struct virtio_scsi_config VirtIOSCSIConfig; struct VirtIOSCSIConf { uint32_t num_queues; uint32_t virtqueue_size; + bool worker_per_virtqueue; bool seg_max_adjust; uint32_t max_sectors; uint32_t cmd_per_lun;