6844855 8.72% snv_115 vol25_09_loopback_32bit performance regression x86
diff --git a/usr/src/uts/common/sys/socket_proto.h b/usr/src/uts/common/sys/socket_proto.h
index 12c9547..84299c4 100644
--- a/usr/src/uts/common/sys/socket_proto.h
+++ b/usr/src/uts/common/sys/socket_proto.h
@@ -60,6 +60,7 @@
 	uint_t sopp_rcvtimer;		/* delayed recv notification (time) */
 	uint32_t sopp_rcvthresh;	/* delayed recv notification (bytes) */
 	socklen_t sopp_maxaddrlen;	/* maximum size of protocol address */
+	boolean_t sopp_loopback;	/* loopback connection */
 };
 
 /* flags to determine which socket options are set */
@@ -75,6 +76,7 @@
 #define	SOCKOPT_RCVTHRESH	0x0200
 #define	SOCKOPT_MAXADDRLEN	0x0400	/* set max address length */
 #define	SOCKOPT_MINPSZ		0x0800	/* set minpsz for protocols */
+#define	SOCKOPT_LOOPBACK	0x1000	/* set loopback */
 
 #define	IS_SO_OOB_INLINE(so)	((so)->so_proto_props.sopp_oobinline)