Index: usr.bin/netstat/if.c
===================================================================
--- usr.bin/netstat/if.c
+++ usr.bin/netstat/if.c
@@ -46,6 +46,7 @@
 
 #include <net/if.h>
 #include <net/if_dl.h>
+#include <net/if_mib.h>
 #include <net/if_types.h>
 #include <net/ethernet.h>
 #include <netinet/in.h>
@@ -680,3 +681,87 @@
 
 	/* NOTREACHED */
 }
+
+void
+ring_stats(char *name)
+{
+	static int mib[] = { CTL_NET,
+			     PF_LINK,
+			     NETLINK_GENERIC,
+			     IFMIB_IFDATA,
+			     0/* index */,
+			     IFDATA_RINGINFO };
+	size_t datalen = 0;
+	struct ifmibdata *data;
+	struct if_ring_data *ifrd;
+	struct xifrstat *ifrs;
+	int nrings, ncpus;
+	int ri, cpu, i;
+
+	if ((mib[4] = if_nametoindex(name)) == 0)
+		xo_err(EX_DATAERR, "if_nametoindex(%s)", name);
+
+	if (sysctl(mib, 6, NULL, &datalen, NULL, 0) < 0)
+		xo_err(EX_OSERR, "sysctl: net.link.generic.ifdata");
+
+	if ((data = malloc(datalen)) == NULL)
+		xo_err(EX_OSERR, "malloc %lu bytes", (u_long)datalen);
+
+	if (sysctl(mib, 6, data, &datalen, NULL, 0) < 0)
+		xo_err(EX_OSERR, "sysctl: net.link.generic.ifdata");
+
+	ifrd = &data->ifmd_ring_data;
+	ifrs = ifrd->ifrd_stats;
+
+	nrings = ifrd->ifrd_nrings;
+	ncpus = ifrd->ifrd_ncpus;
+
+	xo_open_instance("interface");
+	for (i = 27; i > 0; i--)
+		xo_emit("-");
+	xo_emit(" {tk:name/%s} ", name);
+	for (i = 28 - (int)strlen(name); i > 0; i--)
+		xo_emit("-");
+	xo_emit("\n");
+
+	xo_open_list("ring");
+	for (ri = 0; ri < nrings; ri++) {
+		xo_open_instance("ring");
+		xo_emit("\nring{tk:ring-id/%d}:\n", ri);
+
+		xo_emit("{T:/%-8s} ", "");
+		for (cpu = 0; cpu < ncpus; cpu++) {
+			char string[32];
+			snprintf(string, sizeof(string), "cpu%d", cpu);
+			xo_emit("{T:/%12s}", string);
+		}
+		xo_emit("\n");
+
+#define DUMP_LAYER(layer)						\
+do {									\
+	xo_open_instance("layer");					\
+	xo_emit("{tk:name/%-8s}:", #layer);				\
+	for (cpu = 0; cpu < ncpus; cpu++) {				\
+		char format[32];					\
+		snprintf(format, sizeof(format), "{tk:cpu%d/%%12lu}", cpu);\
+		xo_emit(format, ifrs[ri * ncpus + cpu].ifrs_##layer);	\
+	}								\
+	xo_emit("\n");							\
+	xo_close_instance("layer");					\
+} while (0)
+		xo_open_list("layer");
+		DUMP_LAYER(ifinput);
+		DUMP_LAYER(netisr);
+		DUMP_LAYER(ether);
+		DUMP_LAYER(ip);
+		DUMP_LAYER(ip6);
+		DUMP_LAYER(tcp);
+		DUMP_LAYER(udp);
+		xo_close_list("layer");
+		xo_close_instance("ring");
+	}
+	xo_close_list("ring");
+	xo_close_instance("interface");
+
+	free(data);
+}
Index: usr.bin/netstat/main.c
===================================================================
--- usr.bin/netstat/main.c
+++ usr.bin/netstat/main.c
@@ -545,7 +545,10 @@
 #endif
 	if (iflag && !sflag) {
 		xo_open_container("statistics");
-		intpr(interval, NULL, af);
+		if (Rflag)
+			intpr(interval, ring_stats, af);
+		else
+			intpr(interval, NULL, af);
 		xo_close_container("statistics");
 		xo_finish();
 		exit(0);
Index: usr.bin/netstat/netstat.h
===================================================================
--- usr.bin/netstat/netstat.h
+++ usr.bin/netstat/netstat.h
@@ -157,3 +157,4 @@
 void	mroutepr(void);
 void	mrt_stats(void);
 void	bpf_stats(char *);
+void	ring_stats(char *);