Rename netsim to netem in latest code.

2004/06/28 13:39:57-07:00 osdl.net!shemminger
Rename: tc/q_netsim.c -> tc/q_netem.c

(Logical change 1.39)

tc/q_netem.c

+/*
+ * q_netem.c		NETEM.
+ *
+ *		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:	Stephen Hemminger <shemminger@osdl.org>
+ *
+ */
+
+#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: ... netem latency TIME  rate KBPS [ mtu BYTES ]\n");
+	fprintf(stderr, "                 [ limit BYTES]\n");
+}
+
+static void explain1(const char *arg)
+{
+	fprintf(stderr, "Illegal \"%s\"\n", arg);
+}
+
+#define usage() return(-1)
+
+static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv, 
+			   struct nlmsghdr *n)
+{
+	struct tc_netem_qopt opt;
+	unsigned mtu=1500, rate=0;
+	int ok = 0;
+
+	memset(&opt, 0, sizeof(opt));
+
+	while (argc > 0) {
+		if (matches(*argv, "limit") == 0) {
+			NEXT_ARG();
+			if (opt.limit || rate) {
+				fprintf(stderr, "Double \"limit/rate\" spec\n");
+				return -1;
+			}
+			if (get_size(&opt.limit, *argv)) {
+				explain1("limit");
+				return -1;
+			}
+			ok++;
+		} else if (matches(*argv, "latency") == 0) {
+			NEXT_ARG();
+			if (get_usecs(&opt.latency, *argv)) {
+				explain1("latency");
+				return -1;
+			}
+			ok++;
+		} else if (matches(*argv, "loss") == 0) {
+			NEXT_ARG();
+			if (get_percent(&opt.loss, *argv)) {
+				explain1("loss");
+				return -1;
+			}
+			ok++;
+		} else if (matches(*argv, "gap") == 0) {
+			char *p;
+			NEXT_ARG();
+			opt.gap = strtoul(*argv, &p, 0);
+			if (p == *argv || *p) {
+				explain1("gap");
+				return -1;
+			}
+			ok++;
+		} else if (matches(*argv, "rate") == 0) {
+			NEXT_ARG();
+			if (rate) {
+				fprintf(stderr, "Double \"rate\" spec\n");
+				return -1;
+			}
+			if (get_rate(&rate, *argv)) {
+				explain1("rate");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "mtu") == 0) {
+			NEXT_ARG();
+			if (get_size(&mtu, *argv)) {
+				explain1("mtu");
+				return -1;
+			}
+			ok++;
+		} else if (strcmp(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "What is \"%s\"?\n", *argv);
+			explain();
+			return -1;
+		}
+		argc--; argv++;
+	}
+
+	if (!ok)
+		return 0;
+
+	if (!opt.limit && !rate) {
+		fprintf(stderr, "Either \"limit\" or \"rate\" are required.\n");
+		return -1;
+	}
+	
+	/* Compute netem bandwith product as limit */
+	if (opt.limit == 0) 
+		opt.limit = ((double)rate * (double)opt.latency/1000000.);
+
+	addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
+	return 0;
+}
+
+static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+	struct tc_netem_qopt *qopt;
+	SPRINT_BUF(b1);
+	SPRINT_BUF(b2);
+
+	if (opt == NULL)
+		return 0;
+
+	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))
+		return -1;
+
+	qopt = RTA_DATA(opt);
+
+	fprintf(f, "limit %s", sprint_size(qopt->limit, b1));
+	if (qopt->latency)
+		fprintf(f, " latency %s", 
+			sprint_usecs(qopt->latency, b2));
+	if (qopt->loss)
+		fprintf(f, " loss %s",
+			sprint_percent(qopt->loss, b1));
+	if (qopt->gap)
+		fprintf(f, " gap %lu", (unsigned long)qopt->gap);
+
+	return 0;
+}
+
+static int netem_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
+{
+	return 0;
+}
+
+struct qdisc_util netem_util = {
+	NULL,
+	"netem",
+	netem_parse_opt,
+	netem_print_opt,
+	netem_print_xstats,
+};