RDMA/hns: Adjust lp_pktn_ini dynamically

lp_pktn_ini means the number of loopback slice packets for long messages,
it should depend on MTU(fixed to 4096B currently) and max size of SQ
inline.

Link: https://lore.kernel.org/r/1588242691-12913-3-git-send-email-liweihang@huawei.com
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -3977,7 +3977,8 @@ static int modify_qp_init_to_rtr(struct ib_qp *ibqp,
 
 	/* mtu*(2^LP_PKTN_INI) should not bigger than 1 message length 64kb */
 	roce_set_field(context->byte_56_dqpn_err, V2_QPC_BYTE_56_LP_PKTN_INI_M,
-		       V2_QPC_BYTE_56_LP_PKTN_INI_S, 0);
+		       V2_QPC_BYTE_56_LP_PKTN_INI_S,
+		       ilog2(hr_dev->caps.max_sq_inline / IB_MTU_4096));
 	roce_set_field(qpc_mask->byte_56_dqpn_err, V2_QPC_BYTE_56_LP_PKTN_INI_M,
 		       V2_QPC_BYTE_56_LP_PKTN_INI_S, 0);