1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
index f86495ace825..f4d7d96c4c86 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.c
+++ b/drivers/vdpa/ifcvf/ifcvf_base.c
@@ -69,6 +69,37 @@ static int ifcvf_read_config_range(struct pci_dev *dev,
 	return 0;
 }
 
+static u16 ifcvf_get_vq_size(struct ifcvf_hw *hw, u16 qid)
+{
+	u16 queue_size;
+
+	vp_iowrite16(qid, &hw->common_cfg->queue_select);
+	queue_size = vp_ioread16(&hw->common_cfg->queue_size);
+
+	return queue_size;
+}
+
+/* This function returns the max allowed safe size for
+ * all virtqueues. It is the minimal size that can be
+ * suppprted by all virtqueues.
+ */
+u16 ifcvf_get_max_vq_size(struct ifcvf_hw *hw)
+{
+	u16 queue_size, max_size, qid;
+
+	max_size = ifcvf_get_vq_size(hw, 0);
+	for (qid = 1; qid < hw->nr_vring; qid++) {
+		queue_size = ifcvf_get_vq_size(hw, qid);
+		/* 0 means the queue is unavailable */
+		if (!queue_size)
+			continue;
+
+		max_size = min(queue_size, max_size);
+	}
+
+	return max_size;
+}
+
 int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
 {
 	struct virtio_pci_cap cap;