Revert "RDMA/hns: Modify the value of long message loopback slice"

driver inclusion
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I7RKQ1

---------------------------------------------------------------------------

This reverts commit 62df4e45.
Signed-off-by: NJuan Zhou <zhoujuan51@h-partners.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -4849,9 +4849,11 @@ static int modify_qp_init_to_rtr(struct ib_qp *ibqp,
 	mtu = ib_mtu_enum_to_int(ib_mtu);
 	if (WARN_ON(mtu <= 0))
 		return -EINVAL;
-#define MIN_LP_MSG_LEN 1024
-	/* mtu * (2 ^ lp_pktn_ini) should be in the range of 1024 to mtu */
-	lp_pktn_ini = ilog2(max(mtu, MIN_LP_MSG_LEN) / mtu);
+#define MAX_LP_MSG_LEN 16384
+	/* MTU * (2 ^ LP_PKTN_INI) shouldn't be bigger than 16KB */
+	lp_pktn_ini = ilog2(MAX_LP_MSG_LEN / mtu);
+	if (WARN_ON(lp_pktn_ini >= 0xF))
+		return -EINVAL;
 
 	if (attr_mask & IB_QP_PATH_MTU) {
 		hr_reg_write(context, QPC_MTU, ib_mtu);