RDMA/irdma: Make the source udp port vary

Get the source udp port number for a QP based on the grh.flow_label or
lqpn/rqrpn. This provides a better spread of traffic across NIC RX queues.

Link: https://lore.kernel.org/r/20220106180359.2915060-4-yanjun.zhu@linux.dev
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/irdma/verbs.c

@@ -1171,6 +1171,10 @@ int irdma_modify_qp_roce(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 			udp_info->ttl = attr->ah_attr.grh.hop_limit;
 			udp_info->flow_label = attr->ah_attr.grh.flow_label;
 			udp_info->tos = attr->ah_attr.grh.traffic_class;
+			udp_info->src_port =
+				rdma_get_udp_sport(udp_info->flow_label,
+						   ibqp->qp_num,
+						   roce_info->dest_qp);
 			irdma_qp_rem_qos(&iwqp->sc_qp);
 			dev->ws_remove(iwqp->sc_qp.vsi, ctx_info->user_pri);
 			ctx_info->user_pri = rt_tos2priority(udp_info->tos);