net/mlx4_core: Add support for RoCE v2 entropy

In RoCE v2 we need to choose a source UDP port, we do so by using
entropy over the source and dest QPNs.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/include/linux/mlx4/qp.h b/include/linux/mlx4/qp.h
index fe052e234906..cdf110d3f260 100644
--- a/include/linux/mlx4/qp.h
+++ b/include/linux/mlx4/qp.h
@@ -204,7 +204,8 @@ struct mlx4_qp_context {
         u32                     reserved1;
         __be32                  next_send_psn;
         __be32                  cqn_send;
-        u32                     reserved2[2];
+        __be16                  roce_entropy;
+        __be16                  reserved2[3];
         __be32                  last_acked_psn;
         __be32                  ssn;
         __be32                  params2;
@@ -487,4 +488,14 @@ static inline struct mlx4_qp *__mlx4_qp_lookup(struct mlx4_dev *dev, u32 qpn)
 
 void mlx4_qp_remove(struct mlx4_dev *dev, struct mlx4_qp *qp);
 
+static inline u16 folded_qp(u32 q)
+{
+        u16 res;
+
+        res = ((q & 0xff) ^ ((q & 0xff0000) >> 16)) | (q & 0xff00);
+        return res;
+}
+
+u16 mlx4_qp_roce_entropy(struct mlx4_dev *dev, u32 qpn);
+
 #endif /* MLX4_QP_H */