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-rw-r--r--Documentation/networking/smc-sysctl.rst13
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diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst
index 0987fd1bc220..742e90e6d822 100644
--- a/Documentation/networking/smc-sysctl.rst
+++ b/Documentation/networking/smc-sysctl.rst
@@ -21,3 +21,16 @@ autocorking_size - INTEGER
know how/when to uncork their sockets.
Default: 64K
+
+smcr_buf_type - INTEGER
+ Controls which type of sndbufs and RMBs to use in later newly created
+ SMC-R link group. Only for SMC-R.
+
+ Default: 0 (physically contiguous sndbufs and RMBs)
+
+ Possible values:
+
+ - 0 - Use physically contiguous buffers
+ - 1 - Use virtually contiguous buffers
+ - 2 - Mixed use of the two types. Try physically contiguous buffers first.
+ If not available, use virtually contiguous buffers then.