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Date: Wed, 17 Jan 2018 15:12:44 -0800
From: Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
To: netdev@...r.kernel.org
Cc: jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: [RFC iproute2] tc: Add support for the TBS Qdisc
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
The Time Based Scheduler (TBS) queueing discipline allows precise
control of the transmission time of packets.
The syntax is:
tc qdisc add dev DEV parent NODE tbs delta <DELTA>
clockid <CLOCKID> offload <1|0>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
include/uapi/linux/pkt_sched.h | 17 ++++++
tc/Makefile | 1 +
tc/q_tbs.c | 119 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 137 insertions(+)
create mode 100644 tc/q_tbs.c
diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index af3cc2f4..514cb742 100644
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -935,4 +935,21 @@ enum {
#define TCA_CBS_MAX (__TCA_CBS_MAX - 1)
+
+/* TBS */
+struct tc_tbs_qopt {
+ __u8 offload;
+ __u8 _pad[3];
+ __s32 delta;
+ __s32 clockid;
+};
+
+enum {
+ TCA_TBS_UNSPEC,
+ TCA_TBS_PARMS,
+ __TCA_TBS_MAX,
+};
+
+#define TCA_TBS_MAX (__TCA_TBS_MAX - 1)
+
#endif
diff --git a/tc/Makefile b/tc/Makefile
index 3716dd6a..3c87b0dc 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -71,6 +71,7 @@ TCMODULES += q_clsact.o
TCMODULES += e_bpf.o
TCMODULES += f_matchall.o
TCMODULES += q_cbs.o
+TCMODULES += q_tbs.o
TCSO :=
ifeq ($(TC_CONFIG_ATM),y)
diff --git a/tc/q_tbs.c b/tc/q_tbs.c
new file mode 100644
index 00000000..f4a73b58
--- /dev/null
+++ b/tc/q_tbs.c
@@ -0,0 +1,119 @@
+/*
+ * q_tbs.c TBS.
+ *
+ * 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: Vinicius Costa Gomes <vinicius.gomes@...el.com>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.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: ... tbs delta NANOS guardband NANOS clockid CLOCKID [offload 0|1]\n");
+
+}
+
+static void explain1(const char *arg, const char *val)
+{
+ fprintf(stderr, "tbs: illegal value for \"%s\": \"%s\"\n", arg, val);
+}
+
+static int tbs_parse_opt(struct qdisc_util *qu, int argc,
+ char **argv, struct nlmsghdr *n, const char *dev)
+{
+ struct tc_tbs_qopt opt = {};
+ struct rtattr *tail;
+
+ while (argc > 0) {
+ if (matches(*argv, "offload") == 0) {
+ NEXT_ARG();
+ if (opt.offload) {
+ fprintf(stderr, "tbs: duplicate \"offload\" specification\n");
+ return -1;
+ }
+ if (get_u8(&opt.offload, *argv, 0)) {
+ explain1("offload", *argv);
+ return -1;
+ }
+ } else if (matches(*argv, "delta") == 0) {
+ NEXT_ARG();
+ if (opt.delta) {
+ fprintf(stderr, "tbs: duplicate \"delta\" specification\n");
+ return -1;
+ }
+ if (get_s32(&opt.delta, *argv, 0)) {
+ explain1("hicredit", *argv);
+ return -1;
+ }
+ } else if (matches(*argv, "clockid") == 0) {
+ NEXT_ARG();
+ if (opt.clockid) {
+ fprintf(stderr, "tbs: duplicate \"clockid\" specification\n");
+ return -1;
+ }
+ if (get_s32(&opt.clockid, *argv, 0)) {
+ explain1("clockid", *argv);
+ return -1;
+ }
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "tbs: unknown parameter \"%s\"\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ tail = NLMSG_TAIL(n);
+ addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
+ addattr_l(n, 2024, TCA_TBS_PARMS, &opt, sizeof(opt));
+ tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+ return 0;
+}
+
+static int tbs_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+ struct rtattr *tb[TCA_TBS_MAX+1];
+ struct tc_tbs_qopt *qopt;
+
+ if (opt == NULL)
+ return 0;
+
+ parse_rtattr_nested(tb, TCA_TBS_MAX, opt);
+
+ if (tb[TCA_TBS_PARMS] == NULL)
+ return -1;
+
+ qopt = RTA_DATA(tb[TCA_TBS_PARMS]);
+ if (RTA_PAYLOAD(tb[TCA_TBS_PARMS]) < sizeof(*qopt))
+ return -1;
+
+ fprintf(f, "clockid %d ", qopt->clockid);
+ fprintf(f, "delta %d ", qopt->delta);
+ fprintf(f, "offload %d ", qopt->offload);
+
+ return 0;
+}
+
+struct qdisc_util tbs_qdisc_util = {
+ .id = "tbs",
+ .parse_qopt = tbs_parse_opt,
+ .print_qopt = tbs_print_opt,
+};
--
2.15.1
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