IB/mlx4: Add report for RSS capabilities by vendor channel

The mlx4's RSS patches submission missed a report of RSS capabilities
which should be reported by the vendor channel in query_device.

Signed-off-by: Guy Levi <guyle@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx4/main.c

@@ -581,6 +581,23 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
 			sizeof(struct mlx4_wqe_data_seg);
 	}
 
+	if (uhw->outlen >= resp.response_length + sizeof(resp.rss_caps)) {
+		resp.response_length += sizeof(resp.rss_caps);
+		if (props->rss_caps.supported_qpts) {
+			resp.rss_caps.rx_hash_function =
+				MLX4_IB_RX_HASH_FUNC_TOEPLITZ;
+			resp.rss_caps.rx_hash_fields_mask =
+				MLX4_IB_RX_HASH_SRC_IPV4 |
+				MLX4_IB_RX_HASH_DST_IPV4 |
+				MLX4_IB_RX_HASH_SRC_IPV6 |
+				MLX4_IB_RX_HASH_DST_IPV6 |
+				MLX4_IB_RX_HASH_SRC_PORT_TCP |
+				MLX4_IB_RX_HASH_DST_PORT_TCP |
+				MLX4_IB_RX_HASH_SRC_PORT_UDP |
+				MLX4_IB_RX_HASH_DST_PORT_UDP;
+		}
+	}
+
 	if (uhw->outlen) {
 		err = ib_copy_to_udata(uhw, &resp, resp.response_length);
 		if (err)

drivers/infiniband/hw/mlx4/mlx4_ib.h

@@ -644,12 +644,18 @@ enum query_device_resp_mask {
 	QUERY_DEVICE_RESP_MASK_TIMESTAMP = 1UL << 0,
 };
 
+struct mlx4_ib_rss_caps {
+	__u64 rx_hash_fields_mask; /* enum mlx4_rx_hash_fields */
+	__u8 rx_hash_function; /* enum mlx4_rx_hash_function_flags */
+	__u8 reserved[7];
+};
+
 struct mlx4_uverbs_ex_query_device_resp {
-	__u32 comp_mask;
-	__u32 response_length;
-	__u64 hca_core_clock_offset;
-	__u32 max_inl_recv_sz;
-	__u32 reserved;
+	__u32			comp_mask;
+	__u32			response_length;
+	__u64			hca_core_clock_offset;
+	__u32			max_inl_recv_sz;
+	struct mlx4_ib_rss_caps	rss_caps;
 };
 
 static inline struct mlx4_ib_dev *to_mdev(struct ib_device *ibdev)