Introduce a new tc command parameter "ltb" to allow configuring lockless
token bucket qdisc.
For example:
# tc qdisc add dev eth0 root handle 1: ltb default 10
# tc class add dev eth0 parent 1: classid 1:10 ltb \
rate 3000Mbit ceil 9000Mbit prio 3
Signed-off-by: Xiangning Yu <xiangning...@alibaba-inc.com>
---
include/uapi/linux/pkt_sched.h | 35 ++++++
tc/Makefile | 1 +
tc/q_ltb.c | 224 +++++++++++++++++++++++++++++++++
3 files changed, 260 insertions(+)
create mode 100644 tc/q_ltb.c
diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index a95f3ae7..cb2a9345 100644
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -445,6 +445,41 @@ struct tc_htb_xstats {
__s32 ctokens;
};
+/* LTB section */
+
+#define TC_LTB_PROTOVER 3 /* the same as LTB and TC's major */
+#define TC_LTB_NUMPRIO 16
+enum {
+ TCA_LTB_UNSPEC,
+ TCA_LTB_PARMS,
+ TCA_LTB_INIT,
+ TCA_LTB_RATE64,
+ TCA_LTB_CEIL64,
+ TCA_LTB_PAD,
+ __TCA_LTB_MAX,
+};
+#define TCA_LTB_MAX (__TCA_LTB_MAX - 1)
+
+struct tc_ltb_opt {
+ struct tc_ratespec rate;
+ struct tc_ratespec ceil;
+ __u64 measured;
+ __u64 allocated;
+ __u64 high_water;
+ __u32 prio;
+};
+
+struct tc_ltb_glob {
+ __u32 version; /* to match LTB/TC */
+ __u32 defcls; /* default class number */
+};
+
+struct tc_ltb_xstats {
+ __u64 measured;
+ __u64 allocated;
+ __u64 high_water;
+};
+
/* HFSC section */
struct tc_hfsc_qopt {
diff --git a/tc/Makefile b/tc/Makefile
index 79c9c1dd..9ccf30b1 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -35,6 +35,7 @@ TCMODULES += f_tcindex.o
TCMODULES += q_ingress.o
TCMODULES += q_hfsc.o
TCMODULES += q_htb.o
+TCMODULES += q_ltb.o
TCMODULES += q_drr.o
TCMODULES += q_qfq.o
TCMODULES += m_gact.o
diff --git a/tc/q_ltb.c b/tc/q_ltb.c
new file mode 100644
index 00000000..f0d03509
--- /dev/null
+++ b/tc/q_ltb.c
@@ -0,0 +1,224 @@
+/*
+ * q_ltb.c LTB.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Xiangning Yu <xiangning...@alibaba-inc.com>
+ */
+
+#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"
+#define LTB_TC_VER 0x30001
+
+static void explain(void)
+{
+ fprintf(stderr, "Usage: ... qdisc add ... ltb [default N]\n"
+ " default minor id of class to which unclassified packets are
sent {0}\n"
+ " rate rate allocated to this class (class can still
borrow)\n"
+ " ceil definite upper class rate (no borrows) {rate}\n"
+ " prio priority of leaf; lower are served first {0}\n"
+ "\nTC LTB version %d.%d\n", LTB_TC_VER >> 16,
+ LTB_TC_VER & 0xffff
+ );
+}
+
+static void explain1(char *arg)
+{
+ fprintf(stderr, "Illegal \"%s\"\n", arg);
+ explain();
+}
+
+static int ltb_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n, const char *dev)
+{
+ struct tc_ltb_glob opt;
+ struct rtattr *tail;
+
+ memset(&opt, 0, sizeof(opt));
+ opt.version = 3;
+ while (argc > 0) {
+ if (matches(*argv, "default") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.defcls, *argv, 16)) {
+ explain1("default");
+ return -1;
+ }
+ } else {
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ tail = addattr_nest(n, 1024, TCA_OPTIONS);
+ addattr_l(n, 2024, TCA_LTB_INIT, &opt, NLMSG_ALIGN(sizeof(opt)));
+ addattr_nest_end(n, tail);
+ return 0;
+}
+
+static int ltb_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n, const char *dev)
+{
+ struct tc_ltb_opt opt;
+ struct rtattr *tail;
+ __u64 ceil64 = 0, rate64 = 0;
+
+ memset(&opt, 0, sizeof(opt));
+ while (argc > 0) {
+ if (matches(*argv, "prio") == 0) {
+ NEXT_ARG();
+ if (get_u32(&opt.prio, *argv, 10)) {
+ explain1("prio");
+ return -1;
+ }
+ } else if (strcmp(*argv, "ceil") == 0) {
+ NEXT_ARG();
+ if (ceil64) {
+ fprintf(stderr, "Double \"ceil\" spec\n");
+ return -1;
+ }
+ if (strchr(*argv, '%')) {
+ if (get_percent_rate64(&ceil64, *argv, dev)) {
+ explain1("ceil");
+ return -1;
+ }
+ } else if (get_rate64(&ceil64, *argv)) {
+ explain1("ceil");
+ return -1;
+ }
+ } else if (strcmp(*argv, "rate") == 0) {
+ NEXT_ARG();
+ if (rate64) {
+ fprintf(stderr, "Double \"rate\" spec\n");
+ return -1;
+ }
+ if (strchr(*argv, '%')) {
+ if (get_percent_rate64(&rate64, *argv, dev)) {
+ explain1("rate");
+ return -1;
+ }
+ } else if (get_rate64(&rate64, *argv)) {
+ explain1("rate");
+ return -1;
+ }
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ if (!rate64) {
+ fprintf(stderr, "\"rate\" is required.\n");
+ return -1;
+ }
+ /* if ceil params are missing, use the same as rate */
+ if (!ceil64)
+ ceil64 = rate64;
+
+ opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;
+ opt.ceil.rate = (ceil64 >= (1ULL << 32)) ? ~0U : ceil64;
+
+ opt.ceil.overhead = 0;
+ opt.rate.overhead = 0;
+ opt.ceil.mpu = 0;
+ opt.rate.mpu = 0;
+
+ tail = addattr_nest(n, 1024, TCA_OPTIONS);
+
+ if (rate64 >= (1ULL << 32))
+ addattr_l(n, 1124, TCA_LTB_RATE64, &rate64, sizeof(rate64));
+
+ if (ceil64 >= (1ULL << 32))
+ addattr_l(n, 1224, TCA_LTB_CEIL64, &ceil64, sizeof(ceil64));
+
+ addattr_l(n, 2024, TCA_LTB_PARMS, &opt, sizeof(opt));
+ addattr_nest_end(n, tail);
+
+ return 0;
+}
+
+static int ltb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct rtattr *tb[TCA_LTB_MAX + 1];
+ struct tc_ltb_opt *lopt;
+ struct tc_ltb_glob *gopt;
+ __u64 rate64, ceil64;
+
+ SPRINT_BUF(b1);
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_LTB_MAX, opt);
+
+ if (tb[TCA_LTB_PARMS]) {
+ lopt = RTA_DATA(tb[TCA_LTB_PARMS]);
+ if (RTA_PAYLOAD(tb[TCA_LTB_PARMS]) < sizeof(*lopt))
+ return -1;
+
+ print_int(PRINT_ANY, "prio", "prio %d ", (int)lopt->prio);
+
+ rate64 = lopt->rate.rate;
+ if (tb[TCA_LTB_RATE64] &&
+ RTA_PAYLOAD(tb[TCA_LTB_RATE64]) >= sizeof(rate64)) {
+ rate64 = *(__u64 *)RTA_DATA(tb[TCA_LTB_RATE64]);
+ }
+
+ ceil64 = lopt->ceil.rate;
+ if (tb[TCA_LTB_CEIL64] &&
+ RTA_PAYLOAD(tb[TCA_LTB_CEIL64]) >= sizeof(ceil64))
+ ceil64 = *(__u64 *)RTA_DATA(tb[TCA_LTB_CEIL64]);
+
+ fprintf(f, "rate %s ", sprint_rate(rate64, b1));
+ fprintf(f, "ceil %s ", sprint_rate(ceil64, b1));
+ if (show_details) {
+ fprintf(f, "measured %llu allocated %llu highwater
%llu",
+ lopt->measured, lopt->allocated,
+ lopt->high_water);
+ }
+ }
+ if (tb[TCA_LTB_INIT]) {
+ gopt = RTA_DATA(tb[TCA_LTB_INIT]);
+ if (RTA_PAYLOAD(tb[TCA_LTB_INIT]) < sizeof(*gopt))
+ return -1;
+
+ print_0xhex(PRINT_ANY, "default", " default %#llx",
gopt->defcls);
+ if (show_details) {
+ sprintf(b1, "%d.%d", gopt->version >> 16, gopt->version
& 0xffff);
+ print_string(PRINT_ANY, "ver", " ver %s", b1);
+ }
+ }
+ return 0;
+}
+
+static int ltb_print_xstats(struct qdisc_util *qu, FILE *f,
+ struct rtattr *xstats)
+{
+ return 0;
+}
+
+struct qdisc_util ltb_qdisc_util = {
+ .id = "ltb",
+ .parse_qopt = ltb_parse_opt,
+ .print_qopt = ltb_print_opt,
+ .print_xstats = ltb_print_xstats,
+ .parse_copt = ltb_parse_class_opt,
+ .print_copt = ltb_print_opt,
+};
--
2.18.4
