RDMA/hns: Fix querying wrong SCC context for DIP algorithm

When using DIP algorithm, all QPs establishing connections with
the same destination IP share the same SCC, which is indexed by
dip_idx, but dip_idx isn't necessarily equal to qpn. Therefore,
dip_idx should be used to query SCC context instead of qpn.

Fixes: 124a9fb ("RDMA/hns: Append SCC context to the raw dump of QPC")
Signed-off-by: wenglianfa <wenglianfa@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20250726075345.846957-1-huangjunxian6@hisilicon.com
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: wenglianfa

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -5476,7 +5476,7 @@ static int hns_roce_v2_query_srqc(struct hns_roce_dev *hr_dev, u32 srqn,
 	return ret;
 }
 
-static int hns_roce_v2_query_sccc(struct hns_roce_dev *hr_dev, u32 qpn,
+static int hns_roce_v2_query_sccc(struct hns_roce_dev *hr_dev, u32 sccn,
 				  void *buffer)
 {
 	struct hns_roce_v2_scc_context *context;
@@ -5488,7 +5488,7 @@ static int hns_roce_v2_query_sccc(struct hns_roce_dev *hr_dev, u32 qpn,
 		return PTR_ERR(mailbox);
 
 	ret = hns_roce_cmd_mbox(hr_dev, 0, mailbox->dma, HNS_ROCE_CMD_QUERY_SCCC,
-				qpn);
+				sccn);
 	if (ret)
 		goto out;
 

drivers/infiniband/hw/hns/hns_roce_restrack.c

@@ -100,6 +100,7 @@ int hns_roce_fill_res_qp_entry_raw(struct sk_buff *msg, struct ib_qp *ib_qp)
 		struct hns_roce_v2_qp_context qpc;
 		struct hns_roce_v2_scc_context sccc;
 	} context = {};
+	u32 sccn = hr_qp->qpn;
 	int ret;
 
 	if (!hr_dev->hw->query_qpc)
@@ -116,7 +117,13 @@ int hns_roce_fill_res_qp_entry_raw(struct sk_buff *msg, struct ib_qp *ib_qp)
 	    !hr_dev->hw->query_sccc)
 		goto out;
 
-	ret = hr_dev->hw->query_sccc(hr_dev, hr_qp->qpn, &context.sccc);
+	if (hr_qp->cong_type == CONG_TYPE_DIP) {
+		if (!hr_qp->dip)
+			goto out;
+		sccn = hr_qp->dip->dip_idx;
+	}
+
+	ret = hr_dev->hw->query_sccc(hr_dev, sccn, &context.sccc);
 	if (ret)
 		ibdev_warn_ratelimited(&hr_dev->ib_dev,
 				       "failed to query SCCC, ret = %d.\n",