q_gred.c revision dcfb7a77f8709125e97c313cb8ab6ec4d87468f4 
1/*
2 * q_gred.c		GRED.
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:    J Hadi Salim(hadi@nortelnetworks.com)
10 *             code ruthlessly ripped from
11 *	       Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
12 *
13 */
14
15#include <stdio.h>
16#include <stdlib.h>
17#include <unistd.h>
18#include <syslog.h>
19#include <fcntl.h>
20#include <sys/socket.h>
21#include <netinet/in.h>
22#include <arpa/inet.h>
23#include <string.h>
24
25#include "utils.h"
26#include "tc_util.h"
27
28#include "tc_red.h"
29
30
31#if 0
32#define DPRINTF(format,args...) fprintf(stderr,format,##args)
33#else
34#define DPRINTF(format,args...)
35#endif
36
37static void explain(void)
38{
39	fprintf(stderr, "Usage: ... gred DP drop-probability limit BYTES "
40	    "min BYTES max BYTES\n");
41	fprintf(stderr, "    avpkt BYTES burst PACKETS probability PROBABILITY "
42	    "bandwidth KBPS\n");
43	fprintf(stderr, "    [prio value]\n");
44	fprintf(stderr," OR ...\n");
45	fprintf(stderr," gred setup DPs <num of DPs> default <default DP> "
46	    "[grio]\n");
47}
48
49#define usage() return(-1)
50
51static int init_gred(struct qdisc_util *qu, int argc, char **argv,
52		     struct nlmsghdr *n)
53{
54
55	struct rtattr *tail;
56	struct tc_gred_sopt opt;
57	int dps = 0;
58	int def_dp = -1;
59
60	while (argc > 0) {
61		DPRINTF(stderr,"init_gred: invoked with %s\n",*argv);
62		if (strcmp(*argv, "DPs") == 0) {
63			NEXT_ARG();
64			DPRINTF(stderr,"init_gred: next_arg with %s\n",*argv);
65			dps = strtol(*argv, (char **)NULL, 10);
66			if (dps < 0 || dps >MAX_DPs) {
67				fprintf(stderr, "DPs =%d\n", dps);
68				fprintf(stderr, "Illegal \"DPs\"\n");
69				fprintf(stderr, "GRED: only %d DPs are "
70					"currently supported\n",MAX_DPs);
71				return -1;
72			}
73		} else if (strcmp(*argv, "default") == 0) {
74			NEXT_ARG();
75			def_dp = strtol(*argv, (char **)NULL, 10);
76			if (dps == 0) {
77				fprintf(stderr, "\"default DP\" must be "
78					"defined after DPs\n");
79				return -1;
80			}
81			if (def_dp < 0 || def_dp > dps) {
82				fprintf(stderr,
83					"\"default DP\" must be less than %d\n",
84					opt.DPs);
85				return -1;
86			}
87		} else if (strcmp(*argv, "grio") == 0) {
88			opt.grio=1;
89		} else if (strcmp(*argv, "help") == 0) {
90			explain();
91			return -1;
92		} else {
93			fprintf(stderr, "What is \"%s\"?\n", *argv);
94			explain();
95			return -1;
96		}
97		argc--; argv++;
98	}
99
100	if (!dps || def_dp == -1) {
101		fprintf(stderr, "Illegal gred setup parameters \n");
102		return -1;
103	}
104
105	memset(&opt, 0, sizeof(struct tc_gred_sopt));
106	opt.DPs = dps;
107	opt.def_DP = def_dp;
108
109	DPRINTF("TC_GRED: sending DPs=%d default=%d\n",opt.DPs,opt.def_DP);
110	n->nlmsg_flags|=NLM_F_CREATE;
111	tail = NLMSG_TAIL(n);
112	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
113	addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
114	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
115	return 0;
116}
117/*
118^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
119*/
120static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
121{
122	int ok=0;
123	struct tc_gred_qopt opt;
124	unsigned burst = 0;
125	unsigned avpkt = 0;
126	double probability = 0.02;
127	unsigned rate = 0;
128	int wlog;
129	__u8 sbuf[256];
130	struct rtattr *tail;
131
132	memset(&opt, 0, sizeof(opt));
133
134	while (argc > 0) {
135		if (strcmp(*argv, "limit") == 0) {
136			NEXT_ARG();
137			if (get_size(&opt.limit, *argv)) {
138				fprintf(stderr, "Illegal \"limit\"\n");
139				return -1;
140			}
141			ok++;
142		} else if (strcmp(*argv, "setup") == 0) {
143			if (ok) {
144				fprintf(stderr, "Illegal \"setup\"\n");
145				return -1;
146			}
147		return init_gred(qu,argc-1, argv+1,n);
148
149		} else if (strcmp(*argv, "min") == 0) {
150			NEXT_ARG();
151			if (get_size(&opt.qth_min, *argv)) {
152				fprintf(stderr, "Illegal \"min\"\n");
153				return -1;
154			}
155			ok++;
156		} else if (strcmp(*argv, "max") == 0) {
157			NEXT_ARG();
158			if (get_size(&opt.qth_max, *argv)) {
159				fprintf(stderr, "Illegal \"max\"\n");
160				return -1;
161			}
162			ok++;
163		} else if (strcmp(*argv, "DP") == 0) {
164			NEXT_ARG();
165			opt.DP=strtol(*argv, (char **)NULL, 10);
166			DPRINTF ("\n ******* DP =%u\n",opt.DP);
167			if (opt.DP >MAX_DPs) { /* need a better error check */
168				fprintf(stderr, "DP =%u \n",opt.DP);
169				fprintf(stderr, "Illegal \"DP\"\n");
170				fprintf(stderr, "GRED: only %d DPs are currently supported\n",MAX_DPs);
171				return -1;
172			}
173			ok++;
174		} else if (strcmp(*argv, "burst") == 0) {
175			NEXT_ARG();
176                        if (get_unsigned(&burst, *argv, 0)) {
177				fprintf(stderr, "Illegal \"burst\"\n");
178				return -1;
179			}
180			ok++;
181		} else if (strcmp(*argv, "avpkt") == 0) {
182			NEXT_ARG();
183			if (get_size(&avpkt, *argv)) {
184				fprintf(stderr, "Illegal \"avpkt\"\n");
185				return -1;
186			}
187			ok++;
188		} else if (strcmp(*argv, "probability") == 0) {
189			NEXT_ARG();
190			if (sscanf(*argv, "%lg", &probability) != 1) {
191				fprintf(stderr, "Illegal \"probability\"\n");
192				return -1;
193			}
194			ok++;
195		} else if (strcmp(*argv, "prio") == 0) {
196			NEXT_ARG();
197			opt.prio=strtol(*argv, (char **)NULL, 10);
198			/* some error check here */
199			ok++;
200		} else if (strcmp(*argv, "bandwidth") == 0) {
201			NEXT_ARG();
202			if (get_rate(&rate, *argv)) {
203				fprintf(stderr, "Illegal \"bandwidth\"\n");
204				return -1;
205			}
206			ok++;
207		} else if (strcmp(*argv, "help") == 0) {
208			explain();
209			return -1;
210		} else {
211			fprintf(stderr, "What is \"%s\"?\n", *argv);
212			explain();
213			return -1;
214		}
215		argc--; argv++;
216	}
217
218	if (!ok)
219		return 0;
220
221	if (rate == 0)
222		get_rate(&rate, "10Mbit");
223
224	if (!opt.qth_min || !opt.qth_max || !burst || !opt.limit || !avpkt ||
225	    (opt.DP<0)) {
226		fprintf(stderr, "Required parameter (min, max, burst, limit, "
227		    "avpket, DP) is missing\n");
228		return -1;
229	}
230
231	if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
232		fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
233		return -1;
234	}
235	if (wlog >= 10)
236		fprintf(stderr, "GRED: WARNING. Burst %d seems to be to "
237		    "large.\n", burst);
238	opt.Wlog = wlog;
239	if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
240		fprintf(stderr, "GRED: failed to calculate probability.\n");
241		return -1;
242	}
243	opt.Plog = wlog;
244	if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
245	    {
246		fprintf(stderr, "GRED: failed to calculate idle damping "
247		    "table.\n");
248		return -1;
249	}
250	opt.Scell_log = wlog;
251
252	tail = NLMSG_TAIL(n);
253	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
254	addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
255	addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
256	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
257	return 0;
258}
259
260static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
261{
262	struct rtattr *tb[TCA_GRED_STAB+1];
263	struct tc_gred_qopt *qopt;
264	int i;
265	SPRINT_BUF(b1);
266	SPRINT_BUF(b2);
267	SPRINT_BUF(b3);
268	SPRINT_BUF(b4);
269	SPRINT_BUF(b5);
270
271	if (opt == NULL)
272		return 0;
273
274	parse_rtattr_nested(tb, TCA_GRED_STAB, opt);
275
276	if (tb[TCA_GRED_PARMS] == NULL)
277		return -1;
278
279	qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
280	if (RTA_PAYLOAD(tb[TCA_GRED_PARMS])  < sizeof(*qopt)*MAX_DPs) {
281		fprintf(f,"\n GRED received message smaller than expected\n");
282		return -1;
283		}
284
285/* Bad hack! should really return a proper message as shown above*/
286
287	for (i=0;i<MAX_DPs;i++, qopt++) {
288		if (qopt->DP >= MAX_DPs) continue;
289		fprintf(f, "\n DP:%d (prio %d) Average Queue %s Measured "
290		    "Queue %s  ",
291			qopt->DP,
292			qopt->prio,
293			sprint_size(qopt->qave, b4),
294			sprint_size(qopt->backlog, b5));
295		fprintf(f, "\n\t Packet drops: %d (forced %d early %d)  ",
296			qopt->forced+qopt->early,
297			qopt->forced,
298			qopt->early);
299		fprintf(f, "\n\t Packet totals: %u (bytes %u)  ",
300			qopt->packets,
301			qopt->bytesin);
302		if (show_details)
303			fprintf(f, "\n limit %s min %s max %s ",
304				sprint_size(qopt->limit, b1),
305				sprint_size(qopt->qth_min, b2),
306				sprint_size(qopt->qth_max, b3));
307				fprintf(f, "ewma %u Plog %u Scell_log %u",
308				    qopt->Wlog, qopt->Plog, qopt->Scell_log);
309	}
310	return 0;
311}
312
313struct qdisc_util gred_qdisc_util = {
314	.id		= "gred",
315	.parse_qopt	= gred_parse_opt,
316	.print_qopt	= gred_print_opt,
317};
318