Index: sys/sockio.h
===================================================================
RCS file: /cvs/src/sys/sys/sockio.h,v
retrieving revision 1.84
diff -u -p -r1.84 sockio.h
--- sys/sockio.h	11 Nov 2021 10:03:10 -0000	1.84
+++ sys/sockio.h	11 May 2023 10:20:41 -0000
@@ -60,6 +60,9 @@
 #define	SIOCGIFDATA	_IOWR('i', 27, struct ifreq)	/* get if_data */
 #define	SIOCSIFLLADDR	_IOW('i', 31, struct ifreq)	/* set link level addr */
 
+#define SIOCSTCPSO	_IOW('i', 36, struct ifreq)	/* set TSO */
+#define SIOCSTCPRO	_IOW('i', 37, struct ifreq)	/* set LRO */
+
 #define	SIOCADDMULTI	 _IOW('i', 49, struct ifreq)	/* add m'cast addr */
 #define	SIOCDELMULTI	 _IOW('i', 50, struct ifreq)	/* del m'cast addr */
 #define	SIOCGETVIFCNT	_IOWR('u', 51, struct sioc_vif_req)/* vif pkt cnt */
Index: net/if.h
===================================================================
RCS file: /cvs/src/sys/net/if.h,v
retrieving revision 1.211
diff -u -p -r1.211 if.h
--- net/if.h	7 Mar 2023 20:09:48 -0000	1.211
+++ net/if.h	11 May 2023 10:20:41 -0000
@@ -232,9 +232,10 @@ struct if_status_description {
 #define	IFXF_AUTOCONF4		0x80	/* [N] v4 autoconf (aka dhcp) enabled */
 #define	IFXF_MONITOR		0x100	/* [N] only used for bpf */
 #define	IFXF_TSO		0x200	/* [N] TCP segment offloading */
+#define	IFXF_LRO		0x400	/* [N] TCP large receive offloading */
 
 #define	IFXF_CANTCHANGE \
-	(IFXF_MPSAFE|IFXF_CLONED)
+	(IFXF_MPSAFE|IFXF_CLONED|IFXF_TSO|IFXF_LRO)
 
 /*
  * Some convenience macros used for setting ifi_baudrate.