IB/mlx4: Add support for XRC QPs

Support the creation of XRC INI and TGT QPs.  To handle the case where
a CQ or PD is not provided, we allocate them internally with the xrcd.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/mlx4/qp.c b/drivers/net/mlx4/qp.c
index ec9350e5f21a..51c53898c35f 100644
--- a/drivers/net/mlx4/qp.c
+++ b/drivers/net/mlx4/qp.c
@@ -280,6 +280,9 @@ int mlx4_init_qp_table(struct mlx4_dev *dev)
          * We reserve 2 extra QPs per port for the special QPs.  The
          * block of special QPs must be aligned to a multiple of 8, so
          * round up.
+         *
+         * We also reserve the MSB of the 24-bit QP number to indicate
+         * that a QP is an XRC QP.
          */
         dev->caps.sqp_start =
                 ALIGN(dev->caps.reserved_qps_cnt[MLX4_QP_REGION_FW], 8);