linux-kernel - [PATCH for-rc 1/2] RDMA/hns: Fix out-of-order issue of requester when setting FENCE

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Message-ID: <20241108075743.2652258-2-huangjunxian6@hisilicon.com>
Date: Fri, 8 Nov 2024 15:57:42 +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>,
	<tangchengchang@...wei.com>
Subject: [PATCH for-rc 1/2] RDMA/hns: Fix out-of-order issue of requester when setting FENCE

The FENCE indicator in hns WQE doesn't ensure that response data from
a previous Read/Atomic operation has been written to the requester's
memory before the subsequent Send/Write operation is processed. This
may result in the subsequent Send/Write operation accessing the original
data in memory instead of the expected response data.

Unlike FENCE, the SO (Strong Order) indicator blocks the subsequent
operation until the previous response data is written to memory and a
bresp is returned. Set the SO indicator instead of FENCE to maintain
strict order.

Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 2 +-
 drivers/infiniband/hw/hns/hns_roce_hw_v2.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 24e906b9d3ae..0374e72c6078 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -582,7 +582,7 @@ static inline int set_rc_wqe(struct hns_roce_qp *qp,
 	if (WARN_ON(ret))
 		return ret;
 
-	hr_reg_write(rc_sq_wqe, RC_SEND_WQE_FENCE,
+	hr_reg_write(rc_sq_wqe, RC_SEND_WQE_SO,
 		     (wr->send_flags & IB_SEND_FENCE) ? 1 : 0);
 
 	hr_reg_write(rc_sq_wqe, RC_SEND_WQE_SE,
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
index c65f68a14a26..56a8d1d9aaf1 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.h
@@ -919,6 +919,7 @@ struct hns_roce_v2_rc_send_wqe {
 #define RC_SEND_WQE_OWNER RC_SEND_WQE_FIELD_LOC(7, 7)
 #define RC_SEND_WQE_CQE RC_SEND_WQE_FIELD_LOC(8, 8)
 #define RC_SEND_WQE_FENCE RC_SEND_WQE_FIELD_LOC(9, 9)
+#define RC_SEND_WQE_SO RC_SEND_WQE_FIELD_LOC(10, 10)
 #define RC_SEND_WQE_SE RC_SEND_WQE_FIELD_LOC(11, 11)
 #define RC_SEND_WQE_INLINE RC_SEND_WQE_FIELD_LOC(12, 12)
 #define RC_SEND_WQE_WQE_INDEX RC_SEND_WQE_FIELD_LOC(30, 15)
-- 
2.33.0