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-rw-r--r--net/core/user_dma.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index 9eee91bcbf3..b7c98dbcdb8 100644
--- a/net/core/user_dma.c
+++ b/net/core/user_dma.c
@@ -30,6 +30,10 @@
#include <linux/rtnetlink.h> /* for BUG_TRAP */
#include <net/tcp.h>
+#define NET_DMA_DEFAULT_COPYBREAK 4096
+
+int sysctl_tcp_dma_copybreak = NET_DMA_DEFAULT_COPYBREAK;
+
/**
* dma_skb_copy_datagram_iovec - Copy a datagram to an iovec.
* @skb - buffer to copy