netdev - [PATCH] vDPA: dont change vq irq after DRIVER

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Message-Id: <20200804102123.69978-1-lingshan.zhu@intel.com>
Date:   Tue,  4 Aug 2020 18:21:23 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     jasowang@...hat.com, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, eli@...lanox.com, shahafs@...lanox.com,
        parav@...lanox.com, Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH] vDPA: dont change vq irq after DRIVER_OK

IRQ of a vq is not expected to be changed in a DRIVER_OK ~ !DRIVER_OK
period for irq offloading purposes. Place this comment at the side of
bus ops get_vq_irq than in set_status in vhost_vdpa.

Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 drivers/vhost/vdpa.c | 1 -
 include/linux/vdpa.h | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 278ea2f00172..26f166a8192e 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -222,7 +222,6 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
 
 	ops->set_status(vdpa, status);
 
-	/* vq irq is not expected to be changed once DRIVER_OK is set */
 	if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK))
 		for (i = 0; i < nvqs; i++)
 			vhost_vdpa_setup_vq_irq(v, i);
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index ba898486f2c7..03aa9f77f192 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -183,6 +183,7 @@ struct vdpa_config_ops {
 	u64 (*get_vq_state)(struct vdpa_device *vdev, u16 idx);
 	struct vdpa_notification_area
 	(*get_vq_notification)(struct vdpa_device *vdev, u16 idx);
+	/* vq irq is not expected to be changed once DRIVER_OK is set */
 	int (*get_vq_irq)(struct vdpa_device *vdv, u16 idx);
 
 	/* Device ops */
-- 
2.18.4