openwrt/package/network/utils/iproute2/patches/950-add-cake-to-tc.patch

--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -871,4 +871,60 @@ struct tc_pie_xstats {
 	__u32 maxq;             /* maximum queue size */
 	__u32 ecn_mark;         /* packets marked with ecn*/
 };
+
+/* CAKE */
+enum {
+	TCA_CAKE_UNSPEC,
+	TCA_CAKE_BASE_RATE,
+	TCA_CAKE_DIFFSERV_MODE,
+	TCA_CAKE_ATM,
+	TCA_CAKE_FLOW_MODE,
+	TCA_CAKE_OVERHEAD,
+	TCA_CAKE_RTT,
+	TCA_CAKE_TARGET,
+	TCA_CAKE_AUTORATE,
+	TCA_CAKE_MEMORY,
+	TCA_CAKE_NAT,
+	TCA_CAKE_ETHERNET,
+	TCA_CAKE_WASH,
+	TCA_CAKE_MPU,
+	__TCA_CAKE_MAX
+};
+#define TCA_CAKE_MAX	(__TCA_CAKE_MAX - 1)
+
+struct tc_cake_traffic_stats {
+	__u32 packets;
+	__u32 link_ms;
+	__u64 bytes;
+};
+
+#define TC_CAKE_MAX_TINS (8)
+struct tc_cake_xstats {
+	__u16 version;  /* == 4, increments when struct extended */
+	__u8  max_tins; /* == TC_CAKE_MAX_TINS */
+	__u8  tin_cnt;  /* <= TC_CAKE_MAX_TINS */
+
+	__u32 threshold_rate   [TC_CAKE_MAX_TINS];
+	__u32 target_us        [TC_CAKE_MAX_TINS];
+	struct tc_cake_traffic_stats sent      [TC_CAKE_MAX_TINS];
+	struct tc_cake_traffic_stats dropped   [TC_CAKE_MAX_TINS];
+	struct tc_cake_traffic_stats ecn_marked[TC_CAKE_MAX_TINS];
+	struct tc_cake_traffic_stats backlog   [TC_CAKE_MAX_TINS];
+	__u32 interval_us      [TC_CAKE_MAX_TINS];
+	__u32 way_indirect_hits[TC_CAKE_MAX_TINS];
+	__u32 way_misses       [TC_CAKE_MAX_TINS];
+	__u32 way_collisions   [TC_CAKE_MAX_TINS];
+	__u32 peak_delay_us    [TC_CAKE_MAX_TINS]; /* ~= delay to bulk flows */
+	__u32 avge_delay_us    [TC_CAKE_MAX_TINS];
+	__u32 base_delay_us    [TC_CAKE_MAX_TINS]; /* ~= delay to sparse flows */
+	__u16 sparse_flows     [TC_CAKE_MAX_TINS];
+	__u16 bulk_flows       [TC_CAKE_MAX_TINS];
+	__u16 unresponse_flows [TC_CAKE_MAX_TINS]; /* v4 - was u32 last_len  */
+	__u16 spare            [TC_CAKE_MAX_TINS]; /* v4 - split last_len */
+	__u32 max_skblen       [TC_CAKE_MAX_TINS];
+	__u32 capacity_estimate;  /* version 2 */
+	__u32 memory_limit;       /* version 3 */
+	__u32 memory_used;        /* version 3 */
+};
+
 #endif
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -69,6 +69,7 @@ TCMODULES += q_codel.o
 TCMODULES += q_fq_codel.o
 TCMODULES += q_fq.o
 TCMODULES += q_pie.o
+TCMODULES += q_cake.o
 TCMODULES += q_hhf.o
 TCMODULES += q_clsact.o
 TCMODULES += e_bpf.o
--- /dev/null
+++ b/tc/q_cake.c
@@ -0,0 +1,692 @@
+/*
+ * Common Applications Kept Enhanced  --  CAKE
+ *
+ *  Copyright (C) 2014-2015 Jonathan Morton <chromatix99@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, provided that this notice is retained in full, this
+ * software may be distributed under the terms of the GNU General
+ * Public License ("GPL") version 2, in which case the provisions of the
+ * GPL apply INSTEAD OF those given above.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "utils.h"
+#include "tc_util.h"
+
+static void explain(void)
+{
+	fprintf(stderr,
+"Usage: ... cake [ bandwidth RATE | unlimited* | autorate_ingress ]\n"
+"                [ rtt TIME | datacentre | lan | metro | regional |\n"
+"                  internet* | oceanic | satellite | interplanetary ]\n"
+"                [ besteffort | diffserv8 | diffserv4 | diffserv-llt |\n"
+"                  diffserv3* ]\n"
+"                [ flowblind | srchost | dsthost | hosts | flows |\n"
+"                  dual-srchost | dual-dsthost | triple-isolate* ]\n"
+"                [ nat | nonat* ]\n"
+"                [ wash | nowash * ]\n"
+"                [ memlimit LIMIT ]\n"
+"                [ ptm | atm | noatm* ] [ overhead N | conservative | raw* ]\n"
+"                [ mpu N ]\n"
+"                (* marks defaults)\n");
+}
+
+static int cake_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+			      struct nlmsghdr *n)
+{
+	int unlimited = 0;
+	unsigned bandwidth = 0;
+	unsigned interval = 0;
+	unsigned target = 0;
+	unsigned diffserv = 0;
+	unsigned memlimit = 0;
+	int  overhead = 0;
+	bool overhead_set = false;
+	bool overhead_override = false;
+	int wash = -1;
+	int mpu = 0;
+	int flowmode = -1;
+	int nat = -1;
+	int atm = -1;
+	int autorate = -1;
+	struct rtattr *tail;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "bandwidth") == 0) {
+			NEXT_ARG();
+			if (get_rate(&bandwidth, *argv)) {
+				fprintf(stderr, "Illegal \"bandwidth\"\n");
+				return -1;
+			}
+			unlimited = 0;
+			autorate = 0;
+		} else if (strcmp(*argv, "unlimited") == 0) {
+			bandwidth = 0;
+			unlimited = 1;
+			autorate = 0;
+		} else if (strcmp(*argv, "autorate_ingress") == 0) {
+			autorate = 1;
+
+		} else if (strcmp(*argv, "rtt") == 0) {
+			NEXT_ARG();
+			if (get_time(&interval, *argv)) {
+				fprintf(stderr, "Illegal \"rtt\"\n");
+				return -1;
+			}
+			target = interval / 20;
+			if(!target)
+				target = 1;
+		} else if (strcmp(*argv, "datacentre") == 0) {
+			interval = 100;
+			target   =   5;
+		} else if (strcmp(*argv, "lan") == 0) {
+			interval = 1000;
+			target   =   50;
+		} else if (strcmp(*argv, "metro") == 0) {
+			interval = 10000;
+			target   =   500;
+		} else if (strcmp(*argv, "regional") == 0) {
+			interval = 30000;
+			target    = 1500;
+		} else if (strcmp(*argv, "internet") == 0) {
+			interval = 100000;
+			target   =   5000;
+		} else if (strcmp(*argv, "oceanic") == 0) {
+			interval = 300000;
+			target   =  15000;
+		} else if (strcmp(*argv, "satellite") == 0) {
+			interval = 1000000;
+			target   =   50000;
+		} else if (strcmp(*argv, "interplanetary") == 0) {
+			interval = 3600000000U;
+			target   =       5000;
+
+		} else if (strcmp(*argv, "besteffort") == 0) {
+			diffserv = 1;
+		} else if (strcmp(*argv, "precedence") == 0) {
+			diffserv = 2;
+		} else if (strcmp(*argv, "diffserv8") == 0) {
+			diffserv = 3;
+		} else if (strcmp(*argv, "diffserv4") == 0) {
+			diffserv = 4;
+		} else if (strcmp(*argv, "diffserv") == 0) {
+			diffserv = 4;
+		} else if (strcmp(*argv, "diffserv-llt") == 0) {
+			diffserv = 5;
+		} else if (strcmp(*argv, "diffserv3") == 0) {
+			diffserv = 6;
+
+		} else if (strcmp(*argv, "nowash") == 0) {
+			wash = 0;
+		} else if (strcmp(*argv, "wash") == 0) {
+			wash = 1;
+
+		} else if (strcmp(*argv, "flowblind") == 0) {
+			flowmode = 0;
+		} else if (strcmp(*argv, "srchost") == 0) {
+			flowmode = 1;
+		} else if (strcmp(*argv, "dsthost") == 0) {
+			flowmode = 2;
+		} else if (strcmp(*argv, "hosts") == 0) {
+			flowmode = 3;
+		} else if (strcmp(*argv, "flows") == 0) {
+			flowmode = 4;
+		} else if (strcmp(*argv, "dual-srchost") == 0) {
+			flowmode = 5;
+		} else if (strcmp(*argv, "dual-dsthost") == 0) {
+			flowmode = 6;
+		} else if (strcmp(*argv, "triple-isolate") == 0) {
+			flowmode = 7;
+
+		} else if (strcmp(*argv, "nat") == 0) {
+			nat = 1;
+		} else if (strcmp(*argv, "nonat") == 0) {
+			nat = 0;
+
+		} else if (strcmp(*argv, "ptm") == 0) {
+			atm = 2;
+		} else if (strcmp(*argv, "atm") == 0) {
+			atm = 1;
+		} else if (strcmp(*argv, "noatm") == 0) {
+			atm = 0;
+
+		} else if (strcmp(*argv, "raw") == 0) {
+			atm = 0;
+			overhead = 0;
+			overhead_set = true;
+			overhead_override = true;
+		} else if (strcmp(*argv, "conservative") == 0) {
+			/*
+			 * Deliberately over-estimate overhead:
+			 * one whole ATM cell plus ATM framing.
+			 * A safe choice if the actual overhead is unknown.
+			 */
+			atm = 1;
+			overhead = 48;
+			overhead_set = true;
+
+		/* Various ADSL framing schemes, all over ATM cells */
+		} else if (strcmp(*argv, "ipoa-vcmux") == 0) {
+			atm = 1;
+			overhead += 8;
+			overhead_set = true;
+		} else if (strcmp(*argv, "ipoa-llcsnap") == 0) {
+			atm = 1;
+			overhead += 16;
+			overhead_set = true;
+		} else if (strcmp(*argv, "bridged-vcmux") == 0) {
+			atm = 1;
+			overhead += 24;
+			overhead_set = true;
+		} else if (strcmp(*argv, "bridged-llcsnap") == 0) {
+			atm = 1;
+			overhead += 32;
+			overhead_set = true;
+		} else if (strcmp(*argv, "pppoa-vcmux") == 0) {
+			atm = 1;
+			overhead += 10;
+			overhead_set = true;
+		} else if (strcmp(*argv, "pppoa-llc") == 0) {
+			atm = 1;
+			overhead += 14;
+			overhead_set = true;
+		} else if (strcmp(*argv, "pppoe-vcmux") == 0) {
+			atm = 1;
+			overhead += 32;
+			overhead_set = true;
+		} else if (strcmp(*argv, "pppoe-llcsnap") == 0) {
+			atm = 1;
+			overhead += 40;
+			overhead_set = true;
+
+		/* Typical VDSL2 framing schemes, both over PTM */
+		/* PTM has 64b/65b coding which absorbs some bandwidth */
+		} else if (strcmp(*argv, "pppoe-ptm") == 0) {
+			atm = 2;
+			overhead += 27;
+			overhead_set = true;
+		} else if (strcmp(*argv, "bridged-ptm") == 0) {
+			atm = 2;
+			overhead += 19;
+			overhead_set = true;
+
+		} else if (strcmp(*argv, "via-ethernet") == 0) {
+			/*
+			 * We used to use this flag to manually compensate for
+			 * Linux including the Ethernet header on Ethernet-type
+			 * interfaces, but not on IP-type interfaces.
+			 *
+			 * It is no longer needed, because Cake now adjusts for
+			 * that automatically, and is thus ignored.
+			 *
+			 * It would be deleted entirely, but it appears in the
+			 * stats output when the automatic compensation is active.
+			 */
+
+		} else if (strcmp(*argv, "ethernet") == 0) {
+			/* ethernet pre-amble & interframe gap & FCS
+			 * you may need to add vlan tag */
+			overhead += 38;
+			overhead_set = true;
+			mpu = 84;
+
+		/* Additional Ethernet-related overhead used by some ISPs */
+		} else if (strcmp(*argv, "ether-vlan") == 0) {
+			/* 802.1q VLAN tag - may be repeated */
+			overhead += 4;
+			overhead_set = true;
+
+		/*
+		 * DOCSIS cable shapers account for Ethernet frame with FCS,
+		 * but not interframe gap nor preamble.
+		 */
+		} else if (strcmp(*argv, "docsis") == 0) {
+			atm = 0;
+			overhead += 18;
+			overhead_set = true;
+			mpu = 64;
+
+		} else if (strcmp(*argv, "overhead") == 0) {
+			char* p = NULL;
+			NEXT_ARG();
+			overhead = strtol(*argv, &p, 10);
+			if(!p || *p || !*argv || overhead < -64 || overhead > 256) {
+				fprintf(stderr, "Illegal \"overhead\", valid range is -64 to 256\\n");
+				return -1;
+			}
+			overhead_set = true;
+
+		} else if (strcmp(*argv, "mpu") == 0) {
+			char* p = NULL;
+			NEXT_ARG();
+			mpu = strtol(*argv, &p, 10);
+			if(!p || *p || !*argv || mpu < 0 || mpu > 256) {
+				fprintf(stderr, "Illegal \"mpu\", valid range is 0 to 256\\n");
+				return -1;
+			}
+
+		} else if (strcmp(*argv, "memlimit") == 0) {
+			NEXT_ARG();
+			if(get_size(&memlimit, *argv)) {
+				fprintf(stderr, "Illegal value for \"memlimit\": \"%s\"\n", *argv);
+				return -1;
+			}
+
+		} else if (strcmp(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "What is \"%s\"?\n", *argv);
+			explain();
+			return -1;
+		}
+		argc--; argv++;
+	}
+
+	tail = NLMSG_TAIL(n);
+	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
+	if (bandwidth || unlimited)
+		addattr_l(n, 1024, TCA_CAKE_BASE_RATE, &bandwidth, sizeof(bandwidth));
+	if (diffserv)
+		addattr_l(n, 1024, TCA_CAKE_DIFFSERV_MODE, &diffserv, sizeof(diffserv));
+	if (atm != -1)
+		addattr_l(n, 1024, TCA_CAKE_ATM, &atm, sizeof(atm));
+	if (flowmode != -1)
+		addattr_l(n, 1024, TCA_CAKE_FLOW_MODE, &flowmode, sizeof(flowmode));
+	if (overhead_set)
+		addattr_l(n, 1024, TCA_CAKE_OVERHEAD, &overhead, sizeof(overhead));
+	if (overhead_override) {
+		unsigned zero = 0;
+		addattr_l(n, 1024, TCA_CAKE_ETHERNET, &zero, sizeof(zero));
+	}
+	if (mpu > 0)
+		addattr_l(n, 1024, TCA_CAKE_MPU, &mpu, sizeof(mpu));
+	if (interval)
+		addattr_l(n, 1024, TCA_CAKE_RTT, &interval, sizeof(interval));
+	if (target)
+		addattr_l(n, 1024, TCA_CAKE_TARGET, &target, sizeof(target));
+	if (autorate != -1)
+		addattr_l(n, 1024, TCA_CAKE_AUTORATE, &autorate, sizeof(autorate));
+	if (memlimit)
+		addattr_l(n, 1024, TCA_CAKE_MEMORY, &memlimit, sizeof(memlimit));
+	if (nat != -1)
+		addattr_l(n, 1024, TCA_CAKE_NAT, &nat, sizeof(nat));
+	if (wash != -1)
+		addattr_l(n, 1024, TCA_CAKE_WASH, &wash, sizeof(wash));
+
+	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+	return 0;
+}
+
+
+static int cake_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+	struct rtattr *tb[TCA_CAKE_MAX + 1];
+	unsigned bandwidth = 0;
+	unsigned diffserv = 0;
+	unsigned flowmode = 0;
+	unsigned interval = 0;
+	unsigned memlimit = 0;
+	int overhead = 0;
+	int ethernet = 0;
+	int mpu = 0;
+	int atm = 0;
+	int nat = 0;
+	int autorate = 0;
+	int wash = 0;
+	SPRINT_BUF(b1);
+	SPRINT_BUF(b2);
+
+	if (opt == NULL)
+		return 0;
+
+	parse_rtattr_nested(tb, TCA_CAKE_MAX, opt);
+
+	if (tb[TCA_CAKE_BASE_RATE] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_BASE_RATE]) >= sizeof(__u32)) {
+		bandwidth = rta_getattr_u32(tb[TCA_CAKE_BASE_RATE]);
+		if(bandwidth)
+			fprintf(f, "bandwidth %s ", sprint_rate(bandwidth, b1));
+		else
+			fprintf(f, "unlimited ");
+	}
+	if (tb[TCA_CAKE_AUTORATE] &&
+		RTA_PAYLOAD(tb[TCA_CAKE_AUTORATE]) >= sizeof(__u32)) {
+		autorate = rta_getattr_u32(tb[TCA_CAKE_AUTORATE]);
+		if(autorate == 1)
+			fprintf(f, "autorate_ingress ");
+		else if(autorate)
+			fprintf(f, "(?autorate?) ");
+	}
+	if (tb[TCA_CAKE_DIFFSERV_MODE] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_DIFFSERV_MODE]) >= sizeof(__u32)) {
+		diffserv = rta_getattr_u32(tb[TCA_CAKE_DIFFSERV_MODE]);
+		switch(diffserv) {
+		case 1:
+			fprintf(f, "besteffort ");
+			break;
+		case 2:
+			fprintf(f, "precedence ");
+			break;
+		case 3:
+			fprintf(f, "diffserv8 ");
+			break;
+		case 4:
+			fprintf(f, "diffserv4 ");
+			break;
+		case 5:
+			fprintf(f, "diffserv-llt ");
+			break;
+		case 6:
+			fprintf(f, "diffserv3 ");
+			break;
+		default:
+			fprintf(f, "(?diffserv?) ");
+			break;
+		};
+	}
+	if (tb[TCA_CAKE_FLOW_MODE] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_FLOW_MODE]) >= sizeof(__u32)) {
+		flowmode = rta_getattr_u32(tb[TCA_CAKE_FLOW_MODE]);
+		nat = !!(flowmode & 64);
+		flowmode &= ~64;
+		switch(flowmode) {
+		case 0:
+			fprintf(f, "flowblind ");
+			break;
+		case 1:
+			fprintf(f, "srchost ");
+			break;
+		case 2:
+			fprintf(f, "dsthost ");
+			break;
+		case 3:
+			fprintf(f, "hosts ");
+			break;
+		case 4:
+			fprintf(f, "flows ");
+			break;
+		case 5:
+			fprintf(f, "dual-srchost ");
+			break;
+		case 6:
+			fprintf(f, "dual-dsthost ");
+			break;
+		case 7:
+			fprintf(f, "triple-isolate ");
+			break;
+		default:
+			fprintf(f, "(?flowmode?) ");
+			break;
+		};
+
+		if(nat)
+			fprintf(f, "nat ");
+	}
+	if (tb[TCA_CAKE_WASH] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_WASH]) >= sizeof(__u32)) {
+		wash = rta_getattr_u32(tb[TCA_CAKE_WASH]);
+	}
+	if (tb[TCA_CAKE_ATM] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_ATM]) >= sizeof(__u32)) {
+		atm = rta_getattr_u32(tb[TCA_CAKE_ATM]);
+	}
+	if (tb[TCA_CAKE_OVERHEAD] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_OVERHEAD]) >= sizeof(__u32)) {
+		overhead = rta_getattr_u32(tb[TCA_CAKE_OVERHEAD]);
+	}
+	if (tb[TCA_CAKE_MPU] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_MPU]) >= sizeof(__u32)) {
+		mpu = rta_getattr_u32(tb[TCA_CAKE_MPU]);
+	}
+	if (tb[TCA_CAKE_ETHERNET] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_ETHERNET]) >= sizeof(__u32)) {
+		ethernet = rta_getattr_u32(tb[TCA_CAKE_ETHERNET]);
+	}
+	if (tb[TCA_CAKE_RTT] &&
+	    RTA_PAYLOAD(tb[TCA_CAKE_RTT]) >= sizeof(__u32)) {
+		interval = rta_getattr_u32(tb[TCA_CAKE_RTT]);
+	}
+
+	if (wash)
+		fprintf(f,"wash ");
+
+	if (interval)
+		fprintf(f, "rtt %s ", sprint_time(interval, b2));
+
+	if (!atm && overhead == ethernet) {
+		fprintf(f, "raw ");
+	} else {
+		if (atm == 1)
+			fprintf(f, "atm ");
+		else if (atm == 2)
+			fprintf(f, "ptm ");
+		else
+			fprintf(f, "noatm ");
+
+		fprintf(f, "overhead %d ", overhead);
+
+		// This is actually the *amount* of automatic compensation, but we only report
+		// its presence as a boolean for now.
+		if (ethernet)
+			fprintf(f, "via-ethernet ");
+	}
+
+	if (mpu) {
+		fprintf(f, "mpu %d ", mpu);
+	}
+
+	if (memlimit)
+		fprintf(f, "memlimit %s", sprint_size(memlimit, b1));
+
+	return 0;
+}
+
+static int cake_print_xstats(struct qdisc_util *qu, FILE *f,
+				 struct rtattr *xstats)
+{
+	/* fq_codel stats format borrowed */
+	struct tc_fq_codel_xstats *st;
+	struct tc_cake_xstats     *stnc;
+	SPRINT_BUF(b1);
+	SPRINT_BUF(b2);
+
+	if (xstats == NULL)
+		return 0;
+
+	if (RTA_PAYLOAD(xstats) < sizeof(st->type))
+		return -1;
+
+	st   = RTA_DATA(xstats);
+	stnc = RTA_DATA(xstats);
+
+	if (st->type == TCA_FQ_CODEL_XSTATS_QDISC && RTA_PAYLOAD(xstats) >= sizeof(*st)) {
+		fprintf(f, "  maxpacket %u drop_overlimit %u new_flow_count %u ecn_mark %u",
+			st->qdisc_stats.maxpacket,
+			st->qdisc_stats.drop_overlimit,
+			st->qdisc_stats.new_flow_count,
+			st->qdisc_stats.ecn_mark);
+		fprintf(f, "\n  new_flows_len %u old_flows_len %u",
+			st->qdisc_stats.new_flows_len,
+			st->qdisc_stats.old_flows_len);
+	} else if (st->type == TCA_FQ_CODEL_XSTATS_CLASS && RTA_PAYLOAD(xstats) >= sizeof(*st)) {
+		fprintf(f, "  deficit %d count %u lastcount %u ldelay %s",
+			st->class_stats.deficit,
+			st->class_stats.count,
+			st->class_stats.lastcount,
+			sprint_time(st->class_stats.ldelay, b1));
+		if (st->class_stats.dropping) {
+			fprintf(f, " dropping");
+			if (st->class_stats.drop_next < 0)
+				fprintf(f, " drop_next -%s",
+					sprint_time(-st->class_stats.drop_next, b1));
+			else
+				fprintf(f, " drop_next %s",
+					sprint_time(st->class_stats.drop_next, b1));
+		}
+	} else if (stnc->version >= 1 && stnc->version < 0xFF
+				&& stnc->max_tins == TC_CAKE_MAX_TINS
+				&& RTA_PAYLOAD(xstats) >= offsetof(struct tc_cake_xstats, capacity_estimate))
+	{
+		int i;
+
+		if(stnc->version >= 3)
+			fprintf(f, " memory used: %s of %s\n", sprint_size(stnc->memory_used, b1), sprint_size(stnc->memory_limit, b2));
+
+		if(stnc->version >= 2)
+			fprintf(f, " capacity estimate: %s\n", sprint_rate(stnc->capacity_estimate, b1));
+
+		switch(stnc->tin_cnt) {
+		case 3:
+			fprintf(f, "                 Bulk   Best Effort      Voice\n");
+			break;
+
+		case 4:
+			fprintf(f, "                 Bulk   Best Effort      Video       Voice\n");
+			break;
+
+		case 5:
+			fprintf(f, "              Low Loss  Best Effort   Low Delay       Bulk  Net Control\n");
+			break;
+
+		default:
+			fprintf(f, "          ");
+			for(i=0; i < stnc->tin_cnt; i++)
+				fprintf(f, "       Tin %u", i);
+			fprintf(f, "\n");
+		};
+
+		fprintf(f, "  thresh  ");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12s", sprint_rate(stnc->threshold_rate[i], b1));
+		fprintf(f, "\n");
+
+		fprintf(f, "  target  ");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12s", sprint_time(stnc->target_us[i], b1));
+		fprintf(f, "\n");
+
+		fprintf(f, "  interval");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12s", sprint_time(stnc->interval_us[i], b1));
+		fprintf(f, "\n");
+
+		fprintf(f, "  pk_delay");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12s", sprint_time(stnc->peak_delay_us[i], b1));
+		fprintf(f, "\n");
+
+		fprintf(f, "  av_delay");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12s", sprint_time(stnc->avge_delay_us[i], b1));
+		fprintf(f, "\n");
+
+		fprintf(f, "  sp_delay");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12s", sprint_time(stnc->base_delay_us[i], b1));
+		fprintf(f, "\n");
+
+		fprintf(f, "  pkts    ");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->sent[i].packets);
+		fprintf(f, "\n");
+
+		fprintf(f, "  bytes   ");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12llu", stnc->sent[i].bytes);
+		fprintf(f, "\n");
+
+		fprintf(f, "  way_inds");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->way_indirect_hits[i]);
+		fprintf(f, "\n");
+
+		fprintf(f, "  way_miss");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->way_misses[i]);
+		fprintf(f, "\n");
+
+		fprintf(f, "  way_cols");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->way_collisions[i]);
+		fprintf(f, "\n");
+
+		fprintf(f, "  drops   ");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->dropped[i].packets);
+		fprintf(f, "\n");
+
+		fprintf(f, "  marks   ");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->ecn_marked[i].packets);
+		fprintf(f, "\n");
+
+		fprintf(f, "  sp_flows");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->sparse_flows[i]);
+		fprintf(f, "\n");
+
+		fprintf(f, "  bk_flows");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->bulk_flows[i]);
+		fprintf(f, "\n");
+
+		if(stnc->version >= 4) {
+			fprintf(f, "  un_flows");
+			for(i=0; i < stnc->tin_cnt; i++)
+				fprintf(f, "%12u", stnc->unresponse_flows[i]);
+			fprintf(f, "\n");
+		}
+
+		fprintf(f, "  max_len ");
+		for(i=0; i < stnc->tin_cnt; i++)
+			fprintf(f, "%12u", stnc->max_skblen[i]);
+		fprintf(f, "\n");
+	} else {
+		return -1;
+	}
+	return 0;
+}
+
+struct qdisc_util cake_qdisc_util = {
+	.id		= "cake",
+	.parse_qopt	= cake_parse_opt,
+	.print_qopt	= cake_print_opt,
+	.print_xstats	= cake_print_xstats,
+};