net/mlx5: Add ability to read and write ECE options

The end result of RDMA-CM ECE handshake is ECE options, which is
needed to be used while configuring data QPs. Such options can
come in any QP state, so add in/out fields to set and query
ECE options.

OUT fields:
* create_qp() - default ECE options for that type of QP.
* modify_qp() - enabled ECE options after QP state transition.

IN fields:
* create_qp() - create QP with this ECE option.
* modify_qp() - requested options. For unconnected QPs, the FW
will return an error if ECE is already configured with any options
that not equal to previously set.
Reviewed-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

include/linux/mlx5/mlx5_ifc.h

@@ -1208,7 +1208,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 	u8         reserved_at_99[0x2];
 	u8         log_max_qp[0x5];
 
-	u8         reserved_at_a0[0xb];
+	u8         reserved_at_a0[0x3];
+	u8	   ece_support[0x1];
+	u8	   reserved_at_a4[0x7];
 	u8         log_max_srq[0x5];
 	u8         reserved_at_b0[0x10];
 
@@ -4216,7 +4218,8 @@ struct mlx5_ifc_rts2rts_qp_out_bits {
 
 	u8         syndrome[0x20];
 
-	u8         reserved_at_40[0x40];
+	u8         reserved_at_40[0x20];
+	u8         ece[0x20];
 };
 
 struct mlx5_ifc_rts2rts_qp_in_bits {
@@ -4233,7 +4236,7 @@ struct mlx5_ifc_rts2rts_qp_in_bits {
 
 	u8         opt_param_mask[0x20];
 
-	u8         reserved_at_a0[0x20];
+	u8         ece[0x20];
 
 	struct mlx5_ifc_qpc_bits qpc;
 
@@ -4246,7 +4249,8 @@ struct mlx5_ifc_rtr2rts_qp_out_bits {
 
 	u8         syndrome[0x20];
 
-	u8         reserved_at_40[0x40];
+	u8         reserved_at_40[0x20];
+	u8         ece[0x20];
 };
 
 struct mlx5_ifc_rtr2rts_qp_in_bits {
@@ -4263,7 +4267,7 @@ struct mlx5_ifc_rtr2rts_qp_in_bits {
 
 	u8         opt_param_mask[0x20];
 
-	u8         reserved_at_a0[0x20];
+	u8         ece[0x20];
 
 	struct mlx5_ifc_qpc_bits qpc;
 
@@ -4815,7 +4819,8 @@ struct mlx5_ifc_query_qp_out_bits {
 
 	u8         syndrome[0x20];
 
-	u8         reserved_at_40[0x40];
+	u8         reserved_at_40[0x20];
+	u8         ece[0x20];
 
 	u8         opt_param_mask[0x20];
 
@@ -6580,7 +6585,8 @@ struct mlx5_ifc_init2rtr_qp_out_bits {
 
 	u8         syndrome[0x20];
 
-	u8         reserved_at_40[0x40];
+	u8         reserved_at_40[0x20];
+	u8         ece[0x20];
 };
 
 struct mlx5_ifc_init2rtr_qp_in_bits {
@@ -6597,7 +6603,7 @@ struct mlx5_ifc_init2rtr_qp_in_bits {
 
 	u8         opt_param_mask[0x20];
 
-	u8         reserved_at_a0[0x20];
+	u8         ece[0x20];
 
 	struct mlx5_ifc_qpc_bits qpc;
 
@@ -7693,7 +7699,7 @@ struct mlx5_ifc_create_qp_out_bits {
 	u8         reserved_at_40[0x8];
 	u8         qpn[0x18];
 
-	u8         reserved_at_60[0x20];
+	u8         ece[0x20];
 };
 
 struct mlx5_ifc_create_qp_in_bits {
@@ -7707,7 +7713,7 @@ struct mlx5_ifc_create_qp_in_bits {
 
 	u8         opt_param_mask[0x20];
 
-	u8         reserved_at_a0[0x20];
+	u8         ece[0x20];
 
 	struct mlx5_ifc_qpc_bits qpc;