net/mlx5: Add bits and fields to support enhanced CQE compression

Expose ifc bits and add needed structure fields and methods to
support enhanced CQE compression feature.
The enhanced CQE compression feature improves cpu utiliziation with
better packet latency from nic to host.
Signed-off-by: Ofer Levi <oferle@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

include/linux/mlx5/device.h

@@ -822,7 +822,10 @@ struct mlx5_cqe64 {
 	__be32		timestamp_l;
 	__be32		sop_drop_qpn;
 	__be16		wqe_counter;
-	u8		signature;
+	union {
+		u8	signature;
+		u8	validity_iteration_count;
+	};
 	u8		op_own;
 };
 
@@ -854,6 +857,11 @@ enum {
 	MLX5_CQE_FORMAT_CSUM_STRIDX = 0x3,
 };
 
+enum {
+	MLX5_CQE_COMPRESS_LAYOUT_BASIC = 0,
+	MLX5_CQE_COMPRESS_LAYOUT_ENHANCED = 1,
+};
+
 #define MLX5_MINI_CQE_ARRAY_SIZE 8
 
 static inline u8 mlx5_get_cqe_format(struct mlx5_cqe64 *cqe)
@@ -866,6 +874,12 @@ static inline u8 get_cqe_opcode(struct mlx5_cqe64 *cqe)
 	return cqe->op_own >> 4;
 }
 
+static inline u8 get_cqe_enhanced_num_mini_cqes(struct mlx5_cqe64 *cqe)
+{
+	/* num_of_mini_cqes is zero based */
+	return get_cqe_opcode(cqe) + 1;
+}
+
 static inline u8 get_cqe_lro_tcppsh(struct mlx5_cqe64 *cqe)
 {
 	return (cqe->lro.tcppsh_abort_dupack >> 6) & 1;

include/linux/mlx5/mlx5_ifc.h

@@ -1739,7 +1739,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 	u8	   log_max_dci_errored_streams[0x5];
 	u8	   reserved_at_598[0x8];
 
-	u8         reserved_at_5a0[0x13];
+	u8         reserved_at_5a0[0x10];
+	u8         enhanced_cqe_compression[0x1];
+	u8         reserved_at_5b1[0x2];
 	u8         log_max_dek[0x5];
 	u8         reserved_at_5b8[0x4];
 	u8         mini_cqe_resp_stride_index[0x1];
@@ -4139,7 +4141,8 @@ struct mlx5_ifc_cqc_bits {
 	u8         cqe_comp_en[0x1];
 	u8         mini_cqe_res_format[0x2];
 	u8         st[0x4];
-	u8         reserved_at_18[0x8];
+	u8         reserved_at_18[0x6];
+	u8         cqe_compression_layout[0x2];
 
 	u8         reserved_at_20[0x20];