net/mlx5e: Add handle SHAMPO cqe support

This patch adds the new CQE SHAMPO fields:
- flush: indicates that we must close the current session and pass the SKB
         to the network stack.

- match: indicates that the current packet matches the oppened session,
         the packet will be merge into the current SKB.

- header_size: the size of the packet headers that written into the headers
               buffer.

- header_entry_index: the entry index in the headers buffer.

- data_offset: packets data offset in the WQE.

Also new cqe handler is added to handle SHAMPO packets:
- The new handler uses CQE SHAMPO fields to build the SKB.
  CQE's Flush and match fields are not used in this patch, packets are not
  merged in this patch.
Signed-off-by: Khalid Manaa <khalidm@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -943,6 +943,7 @@ struct mlx5e_priv {
 struct mlx5e_rx_handlers {
 	mlx5e_fp_handle_rx_cqe handle_rx_cqe;
 	mlx5e_fp_handle_rx_cqe handle_rx_cqe_mpwqe;
+	mlx5e_fp_handle_rx_cqe handle_rx_cqe_mpwqe_shampo;
 };
 
 extern const struct mlx5e_rx_handlers mlx5e_rx_handlers_nic;

include/linux/mlx5/device.h

@@ -800,10 +800,23 @@ struct mlx5_cqe64 {
 	u8		tls_outer_l3_tunneled;
 	u8		rsvd0;
 	__be16		wqe_id;
-	u8		lro_tcppsh_abort_dupack;
-	u8		lro_min_ttl;
-	__be16		lro_tcp_win;
-	__be32		lro_ack_seq_num;
+	union {
+		struct {
+			u8	tcppsh_abort_dupack;
+			u8	min_ttl;
+			__be16	tcp_win;
+			__be32	ack_seq_num;
+		} lro;
+		struct {
+			u8	reserved0:1;
+			u8	match:1;
+			u8	flush:1;
+			u8	reserved3:5;
+			u8	header_size;
+			__be16	header_entry_index;
+			__be32	data_offset;
+		} shampo;
+	};
 	__be32		rss_hash_result;
 	u8		rss_hash_type;
 	u8		ml_path;
@@ -873,7 +886,7 @@ static inline u8 get_cqe_opcode(struct mlx5_cqe64 *cqe)
 
 static inline u8 get_cqe_lro_tcppsh(struct mlx5_cqe64 *cqe)
 {
-	return (cqe->lro_tcppsh_abort_dupack >> 6) & 1;
+	return (cqe->lro.tcppsh_abort_dupack >> 6) & 1;
 }
 
 static inline u8 get_cqe_l4_hdr_type(struct mlx5_cqe64 *cqe)