[PATCH rdma-next v2 4/6] RDMA/mlx5: Define RoCEv2 udp source port when set path

[Leon Romanovsky <leon@kernel.org>]

From: Mark Zhang <markz@mellanox.com>

Calculate and set UDP source port based on the flow label. If flow label is
not defined in GRH then calculate it based on lqpn/rqpn.

Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
 drivers/infiniband/hw/mlx5/qp.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 9e9ad69152f7..e7083ab3bcd2 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -2967,6 +2967,21 @@ static int modify_raw_packet_tx_affinity(struct mlx5_core_dev *dev,
 	return err;
 }
 
+static void mlx5_set_path_udp_sport(struct mlx5_qp_path *path,
+				    const struct rdma_ah_attr *ah,
+				    u32 lqpn, u32 rqpn)
+
+{
+	u32 fl = ah->grh.flow_label;
+	u16 sport;
+
+	if (!fl)
+		fl = rdma_calc_flow_label(lqpn, rqpn);
+
+	sport = rdma_flow_label_to_udp_sport(fl);
+	path->udp_sport = cpu_to_be16(sport);
+}
+
 static int mlx5_set_path(struct mlx5_ib_dev *dev, struct mlx5_ib_qp *qp,
 			 const struct rdma_ah_attr *ah,
 			 struct mlx5_qp_path *path, u8 port, int attr_mask,
@@ -2998,12 +3013,15 @@ static int mlx5_set_path(struct mlx5_ib_dev *dev, struct mlx5_ib_qp *qp,
 			return -EINVAL;
 
 		memcpy(path->rmac, ah->roce.dmac, sizeof(ah->roce.dmac));
-		if (qp->ibqp.qp_type == IB_QPT_RC ||
-		    qp->ibqp.qp_type == IB_QPT_UC ||
-		    qp->ibqp.qp_type == IB_QPT_XRC_INI ||
-		    qp->ibqp.qp_type == IB_QPT_XRC_TGT)
-			path->udp_sport =
-				mlx5_get_roce_udp_sport(dev, ah->grh.sgid_attr);
+		if ((qp->ibqp.qp_type == IB_QPT_RC ||
+		     qp->ibqp.qp_type == IB_QPT_UC ||
+		     qp->ibqp.qp_type == IB_QPT_XRC_INI ||
+		     qp->ibqp.qp_type == IB_QPT_XRC_TGT) &&
+		    (grh->sgid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) &&
+		    (attr_mask & IB_QP_DEST_QPN))
+			mlx5_set_path_udp_sport(path, ah,
+						qp->ibqp.qp_num,
+						attr->dest_qp_num);
 		path->dci_cfi_prio_sl = (sl & 0x7) << 4;
 		gid_type = ah->grh.sgid_attr->gid_type;
 		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
-- 
2.25.2