[PATCH v2 for-rc 1/8] RDMA/hns: Check atomic wr length

[Junxian Huang]

8 bytes is the only supported length of atomic. Add this check in
set_rc_wqe(). Besides, stop processing WQEs and return from
set_rc_wqe() if there is any error.

Fixes: 384f88185112 ("RDMA/hns: Add atomic support")
Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
---
 drivers/infiniband/hw/hns/hns_roce_device.h | 2 ++
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c  | 9 +++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index ff0b3f68ee3a..05005079258c 100644
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -91,6 +91,8 @@
 /* Configure to HW for PAGE_SIZE larger than 4KB */
 #define PG_SHIFT_OFFSET				(PAGE_SHIFT - 12)
 
+#define ATOMIC_WR_LEN				8
+
 #define HNS_ROCE_IDX_QUE_ENTRY_SZ		4
 #define SRQ_DB_REG				0x230
 
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 4287818a737f..eb6052ee8938 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -591,11 +591,16 @@ static inline int set_rc_wqe(struct hns_roce_qp *qp,
 		     (wr->send_flags & IB_SEND_SIGNALED) ? 1 : 0);
 
 	if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
-	    wr->opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
+	    wr->opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
+		if (msg_len != ATOMIC_WR_LEN)
+			return -EINVAL;
 		set_atomic_seg(wr, rc_sq_wqe, valid_num_sge);
-	else if (wr->opcode != IB_WR_REG_MR)
+	} else if (wr->opcode != IB_WR_REG_MR) {
 		ret = set_rwqe_data_seg(&qp->ibqp, wr, rc_sq_wqe,
 					&curr_idx, valid_num_sge);
+		if (ret)
+			return ret;
+	}
 
 	/*
 	 * The pipeline can sequentially post all valid WQEs into WQ buffer,
-- 
2.33.0