diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 542d395..c90daa5 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -18,6 +18,7 @@
 #define _LINUX_TCP_H
 
 #include <linux/types.h>
+#include <linux/dmaengine.h>
 #include <asm/byteorder.h>
 
 struct tcphdr {
@@ -233,6 +234,13 @@
 		struct iovec		*iov;
 		int			memory;
 		int			len;
+#ifdef CONFIG_NET_DMA
+		/* members for async copy */
+		struct dma_chan		*dma_chan;
+		int			wakeup;
+		struct dma_pinned_list	*pinned_list;
+		dma_cookie_t		dma_cookie;
+#endif
 	} ucopy;
 
 	__u32	snd_wl1;	/* Sequence for window update		*/