I/OAT: Add documentation for the tcp_dma_copybreak sysctl

Signed-off-by: Chris Leech <christopher.leech@intel.com>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index af6a63ab9026a3f834a92af6746212e6b7e971f6..8f6067ea5e3e7eb26a2f8771f7d727ad5d0eb23d 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -433,6 +433,12 @@ tcp_workaround_signed_windows - BOOLEAN
        not receive a window scaling option from them.
        Default: 0
 
+tcp_dma_copybreak - INTEGER
+       Lower limit, in bytes, of the size of socket reads that will be
+       offloaded to a DMA copy engine, if one is present in the system
+       and CONFIG_NET_DMA is enabled.
+       Default: 4096
+
 CIPSOv4 Variables:
 
 cipso_cache_enable - BOOLEAN