linux-kernel - [PATCH for-next 1/2] Revert "RDMA/hns: The UD mode can only be configured with DCQCN"

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Date: Wed, 7 Feb 2024 11:29:09 +0800
From: Junxian Huang <huangjunxian6@...ilicon.com>
To: <jgg@...pe.ca>, <leon@...nel.org>
CC: <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
	<linux-kernel@...r.kernel.org>, <huangjunxian6@...ilicon.com>
Subject: [PATCH for-next 1/2] Revert "RDMA/hns: The UD mode can only be configured with DCQCN"

From: Luoyouming <luoyouming@...wei.com>

This reverts commit 27c5fd271d8b8730fc0bb1b6cae953ad7808a874.

Commit 27c5fd271d8b ("RDMA/hns: The UD mode can only be configured
with DCQCN") adds a check of congest control alorithm for UD. But
that patch causes a problem: hr_dev->caps.congest_type is global,
used by all QPs, so modifying this field to DCQCN for UD QPs causes
other QPs unable to use any other algorithm except DCQCN.

Revert that patch. The UD algorithm issue will be fixed in a
subsequent patch of this series.

Fixes: 27c5fd271d8b ("RDMA/hns: The UD mode can only be configured with DCQCN")
Signed-off-by: Luoyouming <luoyouming@...wei.com>
Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index de56dc6e3226..8907c30598ab 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -4739,9 +4739,6 @@ static int check_cong_type(struct ib_qp *ibqp,
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibqp->device);
 
-	if (ibqp->qp_type == IB_QPT_UD)
-		hr_dev->caps.cong_type = CONG_TYPE_DCQCN;
-
 	/* different congestion types match different configurations */
 	switch (hr_dev->caps.cong_type) {
 	case CONG_TYPE_DCQCN:
-- 
2.30.0