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From:   Jason Wang <jasowang@redhat.com>
To:     mst@redhat.com, virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org
Cc:     shahafs@mellanox.com, lulu@redhat.com, sgarzare@redhat.com,
        rdunlap@infradead.org, Jason Wang <jasowang@redhat.com>
Subject: [PATCH V3 13/19] virtio-pci-modern: introduce helper for getting queue nums
Date:   Mon,  4 Jan 2021 14:54:57 +0800
Message-Id: <20210104065503.199631-14-jasowang@redhat.com>
In-Reply-To: <20210104065503.199631-1-jasowang@redhat.com>
References: <20210104065503.199631-1-jasowang@redhat.com>
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This patch introduces helper for getting queue num of modern device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 drivers/virtio/virtio_pci_modern.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 7a89226135af..bccad1329871 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -292,6 +292,17 @@ static u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
 
 }
 
+/*
+ * vp_modern_get_num_queues - get the number of virtqueues
+ * @mdev: the modern virtio-pci device
+ *
+ * Returns the number of virtqueues
+ */
+static u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev)
+{
+	return vp_ioread16(&mdev->common->num_queues);
+}
+
 /* virtio config->finalize_features() implementation */
 static int vp_finalize_features(struct virtio_device *vdev)
 {
@@ -510,7 +521,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 	u16 num, off;
 	int err;
 
-	if (index >= vp_ioread16(&cfg->num_queues))
+	if (index >= vp_modern_get_num_queues(mdev))
 		return ERR_PTR(-ENOENT);
 
 	/* Select the queue we're interested in */
-- 
2.25.1