netdev - [RFC 5/6] vDPA: answer num of queue pairs = 1 to userspace when VIRTIO_NET_F

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Date:   Fri, 13 May 2022 16:39:34 +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,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [RFC 5/6] vDPA: answer num of queue pairs = 1 to userspace when VIRTIO_NET_F_MQ == 0

If VIRTIO_NET_F_MQ == 0, the virtio device should have one queue pair,
so when userspace querying queue pair numbers, it should return mq=1
than zero

Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 drivers/vdpa/vdpa.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 030d96bdeed2..50a11ece603e 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -818,9 +818,10 @@ static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
 	u16 val_u16;
 
 	if ((features & BIT_ULL(VIRTIO_NET_F_MQ)) == 0)
-		return 0;
+		val_u16 = 1;
+	else
+		val_u16 = le16_to_cpu((__force __le16)config->max_virtqueue_pairs);
 
-	val_u16 = le16_to_cpu(config->max_virtqueue_pairs);
 	return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, val_u16);
 }
 
-- 
2.31.1