2 files changed, 8 insertions, 6 deletions

diff --git a/Documentation/ABI/removed/net_dma b/Documentation/ABI/removed/net_dma
new file mode 100644
index 000000000000..a173aecc2f18
--- /dev/null
+++ b/Documentation/ABI/removed/net_dma
@@ -0,0 +1,8 @@
+What:           tcp_dma_copybreak sysctl
+Date:           Removed in kernel v3.13
+Contact:        Dan Williams <dan.j.williams@intel.com>
+Description:
+        Formerly the lower limit, in bytes, of the size of socket reads
+        that will be offloaded to a DMA copy engine.  Removed due to
+        coherency issues of the cpu potentially touching the buffers
+        while dma is in flight.
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index ab42c95f9985..ea8f3b182e70 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -582,12 +582,6 @@ 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
-
 tcp_thin_linear_timeouts - BOOLEAN
         Enable dynamic triggering of linear timeouts for thin streams.
         If set, a check is performed upon retransmission by timeout to