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Index: head/lib/libc/sys/getsockopt.2
===================================================================
--- head/lib/libc/sys/getsockopt.2
+++ head/lib/libc/sys/getsockopt.2
@@ -28,7 +28,7 @@
.\" @(#)getsockopt.2 8.4 (Berkeley) 5/2/95
.\" $FreeBSD$
.\"
-.Dd September 11, 2019
+.Dd June 03, 2020
.Dt GETSOCKOPT 2
.Os
.Sh NAME
@@ -191,6 +191,8 @@
.It Dv SO_USER_COOKIE Ta "set the 'so_user_cookie' value for the socket (uint32_t, set only)"
.It Dv SO_TS_CLOCK Ta "set specific format of timestamp returned by SO_TIMESTAMP"
.It Dv SO_MAX_PACING_RATE Ta "set the maximum transmit rate in bytes per second for the socket"
+.It Dv SO_NO_OFFLOAD Ta "disables protocol offloads"
+.It Dv SO_NO_DDP Ta "disables direct data placement offload"
.El
.Pp
.Dv SO_DEBUG
@@ -512,7 +514,6 @@
It may be used to check for asynchronous errors on connected
datagram sockets or for other asynchronous errors.
.Pp
-Finally,
.Dv SO_LABEL
returns the MAC label of the socket.
.Dv SO_PEERLABEL
@@ -521,6 +522,7 @@
See
.Xr mac 3
for more information.
+.Pp
.Dv SO_LISTENQLIMIT
returns the maximal number of queued connections, as set by
.Xr listen 2 .
@@ -532,6 +534,17 @@
.Dv SO_MAX_PACING_RATE
instruct the socket and underlying network adapter layers to limit the
transfer rate to the given unsigned 32-bit value in bytes per second.
+.Pp
+.Dv SO_NO_OFFLOAD
+disables support for protocol offloads.
+At present, this prevents TCP sockets from using TCP offload engines.
+.Dv SO_NO_DDP
+disables support for a specific TCP offload known as direct data
+placement (DDP).
+DDP is an offload supported by Chelsio network adapters that permits
+reassembled TCP data streams to be received via zero-copy in
+user-supplied buffers using
+.Xr aio_read 2 .
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS

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