[PATCH 5.15 65/83] vdpa/ifcvf: fix the calculation of queuepair

[Greg Kroah-Hartman]

From: Angus Chen <angus.chen@xxxxxxxxxxxxxxx>

[ Upstream commit db5db1a00d0816207be3a0166fcb4f523eaf3b52 ]

The q_pair_id to address a queue pair in the lm bar should be
calculated by queue_id / 2 rather than queue_id / nr_vring.

Fixes: 2ddae773c93b ("vDPA/ifcvf: detect and use the onboard number of queues directly")
Signed-off-by: Angus Chen <angus.chen@xxxxxxxxxxxxxxx>
Reviewed-by: Jason Wang <jasowang@xxxxxxxxxx>
Reviewed-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
Message-Id: <20220923091013.191-1-angus.chen@xxxxxxxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/vdpa/ifcvf/ifcvf_base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
index 7d41dfe48ade..5091ff9d6c93 100644
--- a/drivers/vdpa/ifcvf/ifcvf_base.c
+++ b/drivers/vdpa/ifcvf/ifcvf_base.c
@@ -327,7 +327,7 @@ u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
 	u32 q_pair_id;
 
 	ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
-	q_pair_id = qid / hw->nr_vring;
+	q_pair_id = qid / 2;
 	avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
 	last_avail_idx = ifc_ioread16(avail_idx_addr);
 
@@ -341,7 +341,7 @@ int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
 	u32 q_pair_id;
 
 	ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
-	q_pair_id = qid / hw->nr_vring;
+	q_pair_id = qid / 2;
 	avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
 	hw->vring[qid].last_avail_idx = num;
 	ifc_iowrite16(num, avail_idx_addr);
-- 
2.35.1