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From: Mike Christie <michael.christie@oracle.com>
To: stefanha@redhat.com, qemu-devel@nongnu.org, fam@euphon.net,
	linux-scsi@vger.kernel.org, target-devel@vger.kernel.org,
	mst@redhat.com, jasowang@redhat.com, pbonzini@redhat.com,
	virtualization@lists.linux-foundation.org
Subject: [PATCH 10/10] vhost-scsi: create a woker per IO vq
Date: Thu, 12 Nov 2020 23:19:10 +0000
Message-ID: <1605223150-10888-12-git-send-email-michael.christie@oracle.com> (raw)
In-Reply-To: <1605223150-10888-1-git-send-email-michael.christie@oracle.com>

This patch has vhost-scsi create a worker thread per IO vq.
It also adds a modparam to enable the feature, because I was thinking
existing setups might not be expecting the extra threading use, so the
default is to use the old single thread multiple vq behavior.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/vhost/scsi.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 612359d..3fb147f 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -62,6 +62,12 @@
  */
 #define VHOST_SCSI_WEIGHT 256
 
+static bool vhost_scsi_worker_per_io_vq;
+module_param_named(thread_per_io_virtqueue, vhost_scsi_worker_per_io_vq, bool,
+		   0644);
+MODULE_PARM_DESC(thread_per_io_virtqueue,
+		 "Create a worker thread per IO virtqueue. Set to true to turn on. Default is false where all virtqueues share a thread.");
+
 struct vhost_scsi_inflight {
 	/* Wait for the flush operation to finish */
 	struct completion comp;
@@ -1805,6 +1811,36 @@ static int vhost_scsi_set_features(struct vhost_scsi *vs, u64 features)
 	return 0;
 }
 
+static int vhost_scsi_enable_vring(struct vhost_virtqueue *vq, bool enable)
+{
+	struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
+	/*
+	 * For compat, we have the evt, ctl and first IO vq share worker0 like
+	 * is setup by default. Additional vqs get their own worker.
+	 */
+	if (vq = &vs->vqs[VHOST_SCSI_VQ_CTL].vq ||
+	    vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq ||
+	    vq = &vs->vqs[VHOST_SCSI_VQ_IO].vq)
+		return 0;
+
+	if (enable) {
+		if (!vhost_scsi_worker_per_io_vq)
+			return 0;
+		if (vq->worker_id != 0)
+			return 0;
+		return vhost_vq_worker_add(vq->dev, vq);
+	} else {
+		if (vq->worker_id = 0)
+			return 0;
+		vhost_vq_worker_remove(vq->dev, vq);
+		return 0;
+	}
+}
+
+static struct vhost_dev_ops vhost_scsi_dev_ops = {
+	.enable_vring = vhost_scsi_enable_vring,
+};
+
 static int vhost_scsi_open(struct inode *inode, struct file *f)
 {
 	struct vhost_scsi_virtqueue *svq;
@@ -1843,7 +1879,7 @@ static int vhost_scsi_open(struct inode *inode, struct file *f)
 		svq->vq.handle_kick = vhost_scsi_handle_kick;
 	}
 	vhost_dev_init(&vs->dev, vqs, VHOST_SCSI_MAX_VQ, UIO_MAXIOV,
-		       VHOST_SCSI_WEIGHT, 0, true, NULL);
+		       VHOST_SCSI_WEIGHT, 0, true, &vhost_scsi_dev_ops);
 
 	vhost_scsi_init_inflight(vs, NULL);
 
-- 
1.8.3.1

  parent reply index

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-12 23:18 [PATCH 00/10] vhost/qemu: thread per IO SCSI vq Mike Christie
2020-11-12 23:19 ` [PATCH 1/1] qemu vhost scsi: add VHOST_SET_VRING_ENABLE support Mike Christie
2020-11-17 11:53   ` Stefan Hajnoczi
2020-12-02  9:59   ` Michael S. Tsirkin
2020-12-02 16:05     ` Michael Christie
2020-11-12 23:19 ` [PATCH 01/10] vhost: remove work arg from vhost_work_flush Mike Christie
2020-11-17 13:04   ` Stefan Hajnoczi
2020-11-12 23:19 ` [PATCH 02/10] vhost scsi: remove extra flushes Mike Christie
2020-11-17 13:07   ` Stefan Hajnoczi
2020-11-12 23:19 ` [PATCH 03/10] vhost poll: fix coding style Mike Christie
2020-11-17 13:07   ` Stefan Hajnoczi
2020-11-12 23:19 ` [PATCH 04/10] vhost: support multiple worker threads Mike Christie
2020-11-12 23:19 ` [PATCH 05/10] vhost: poll support support multiple workers Mike Christie
2020-11-17 15:32   ` Stefan Hajnoczi
2020-11-12 23:19 ` [PATCH 06/10] vhost scsi: make SCSI cmd completion per vq Mike Christie
2020-11-17 16:04   ` Stefan Hajnoczi
2020-11-12 23:19 ` [PATCH 07/10] vhost, vhost-scsi: flush IO vqs then send TMF rsp Mike Christie
2020-11-17 16:05   ` Stefan Hajnoczi
2020-11-12 23:19 ` [PATCH 08/10] vhost: move msg_handler to new ops struct Mike Christie
2020-11-17 16:08   ` Stefan Hajnoczi
2020-11-12 23:19 ` [PATCH 09/10] vhost: add VHOST_SET_VRING_ENABLE support Mike Christie
2020-11-17 16:14   ` Stefan Hajnoczi
2020-11-12 23:19 ` Mike Christie [this message]
2020-11-17 16:40 ` [PATCH 00/10] vhost/qemu: thread per IO SCSI vq Stefan Hajnoczi
2020-11-17 19:13   ` Mike Christie
2020-11-18  9:54     ` Michael S. Tsirkin
2020-11-19 14:00       ` Stefan Hajnoczi
2020-11-18 11:31     ` Stefan Hajnoczi
2020-11-19 14:46       ` Michael S. Tsirkin
2020-11-19 16:11         ` Mike Christie
2020-11-19 16:24           ` Stefan Hajnoczi
2020-11-19 16:43             ` Mike Christie
2020-11-19 17:08               ` Stefan Hajnoczi
2020-11-20  8:45                 ` Stefan Hajnoczi
2020-11-20 12:31                   ` Michael S. Tsirkin
2020-12-01 12:59                     ` Stefan Hajnoczi
2020-12-01 13:45                       ` Stefano Garzarella
2020-12-01 17:43                         ` Stefan Hajnoczi
2020-12-02 10:35                           ` Stefano Garzarella
2020-11-23 15:17                   ` Stefano Garzarella
2020-11-18  5:17   ` Jason Wang
2020-11-18  6:57     ` Mike Christie
2020-11-18  7:19       ` Mike Christie
2020-11-18  7:54       ` Jason Wang
2020-11-18 20:06         ` Mike Christie
2020-11-19  4:35           ` Jason Wang
2020-11-19 15:49             ` Mike Christie

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