[I/OAT]: Add a sysctl for tuning the I/OAT offloaded I/O threshold

[deliverable/linux.git] / net / core / user_dma.c

diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index 9eee91bcbf3f9f30d903dc9a49533e4e588752ef..b7c98dbcdb81102ccd50e0d3f354294eae6c6919 100644 (file)
--- 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