q_gred.c revision 95812b56a5a66e7e9a21744cfe8bc0bb9791ea98 
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, struct nlmsghdr *n)
52{
53
54	struct rtattr *tail;
55	struct tc_gred_sopt opt;
56	memset(&opt, 0, sizeof(struct tc_gred_sopt));
57
58	while (argc > 0) {
59		DPRINTF(stderr,"init_gred: invoked with %s\n",*argv);
60		if (strcmp(*argv, "DPs") == 0) {
61			NEXT_ARG();
62			DPRINTF(stderr,"init_gred: next_arg with %s\n",*argv);
63			opt.DPs=strtol(*argv, (char **)NULL, 10);
64			if (opt.DPs >MAX_DPs) { /* need a better error check */
65				fprintf(stderr, "DPs =%u \n",opt.DPs);
66				fprintf(stderr, "Illegal \"DPs\"\n");
67				fprintf(stderr, "GRED: only %d DPs are "
68				    "currently supported\n",MAX_DPs);
69				return -1;
70			}
71		} else if (strcmp(*argv, "default") == 0) {
72			NEXT_ARG();
73			opt.def_DP=strtol(*argv, (char **)NULL, 10);
74			if (!opt.DPs) {
75				fprintf(stderr, "\"default DP\" must be "
76				    "defined after DPs\n");
77				return -1;
78			}
79#if 0
80			if (opt.def_DP>opt.DPs-1) {
81#endif
82			if (opt.def_DP>opt.DPs) {
83/*
84				fprintf(stderr, "\"default DP\" must be less than %d\nNote: DP runs from 0 to %d for %d DPs\n",opt.DPs,opt.DPs-1,opt.DPs);
85*/
86				fprintf(stderr, "\"default DP\" must be less than %d\n",opt.DPs);
87				return -1;
88			}
89		} else if (strcmp(*argv, "grio") == 0) {
90			opt.grio=1;
91		} else if (strcmp(*argv, "help") == 0) {
92			explain();
93			return -1;
94		} else {
95			fprintf(stderr, "What is \"%s\"?\n", *argv);
96			explain();
97			return -1;
98		}
99		argc--; argv++;
100}
101
102if ((!opt.DPs) || (!opt.def_DP))
103{
104	fprintf(stderr, "Illegal gred setup parameters \n");
105			return -1;
106}
107DPRINTF("TC_GRED: sending DPs=%d default=%d\n",opt.DPs,opt.def_DP);
108	n->nlmsg_flags|=NLM_F_CREATE;
109	tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
110
111	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
112	addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
113	tail->rta_len = (((void*)n)+NLMSG_ALIGN(n->nlmsg_len)) - (void*)tail;
114return 0;
115}
116/*
117^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
118*/
119static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
120{
121	int ok=0;
122	struct tc_gred_qopt opt;
123	unsigned burst = 0;
124	unsigned avpkt = 0;
125	double probability = 0.02;
126	unsigned rate = 0;
127	int wlog;
128	__u8 sbuf[256];
129	struct rtattr *tail;
130
131	memset(&opt, 0, sizeof(opt));
132
133	while (argc > 0) {
134		if (strcmp(*argv, "limit") == 0) {
135			NEXT_ARG();
136			if (get_size(&opt.limit, *argv)) {
137				fprintf(stderr, "Illegal \"limit\"\n");
138				return -1;
139			}
140			ok++;
141		} else if (strcmp(*argv, "setup") == 0) {
142			if (ok) {
143				fprintf(stderr, "Illegal \"setup\"\n");
144				return -1;
145			}
146		return init_gred(qu,argc-1, argv+1,n);
147
148		} else if (strcmp(*argv, "min") == 0) {
149			NEXT_ARG();
150			if (get_size(&opt.qth_min, *argv)) {
151				fprintf(stderr, "Illegal \"min\"\n");
152				return -1;
153			}
154			ok++;
155		} else if (strcmp(*argv, "max") == 0) {
156			NEXT_ARG();
157			if (get_size(&opt.qth_max, *argv)) {
158				fprintf(stderr, "Illegal \"max\"\n");
159				return -1;
160			}
161			ok++;
162		} else if (strcmp(*argv, "DP") == 0) {
163			NEXT_ARG();
164			opt.DP=strtol(*argv, (char **)NULL, 10);
165			DPRINTF ("\n ******* DP =%u\n",opt.DP);
166			if (opt.DP >MAX_DPs) { /* need a better error check */
167				fprintf(stderr, "DP =%u \n",opt.DP);
168				fprintf(stderr, "Illegal \"DP\"\n");
169				fprintf(stderr, "GRED: only %d DPs are currently supported\n",MAX_DPs);
170				return -1;
171			}
172#if 0
173				return -1;
174			}
175#endif
176			ok++;
177		} else if (strcmp(*argv, "burst") == 0) {
178			NEXT_ARG();
179                        if (get_unsigned(&burst, *argv, 0)) {
180				fprintf(stderr, "Illegal \"burst\"\n");
181				return -1;
182			}
183			ok++;
184		} else if (strcmp(*argv, "avpkt") == 0) {
185			NEXT_ARG();
186			if (get_size(&avpkt, *argv)) {
187				fprintf(stderr, "Illegal \"avpkt\"\n");
188				return -1;
189			}
190			ok++;
191		} else if (strcmp(*argv, "probability") == 0) {
192			NEXT_ARG();
193			if (sscanf(*argv, "%lg", &probability) != 1) {
194				fprintf(stderr, "Illegal \"probability\"\n");
195				return -1;
196			}
197			ok++;
198		} else if (strcmp(*argv, "prio") == 0) {
199			NEXT_ARG();
200			opt.prio=strtol(*argv, (char **)NULL, 10);
201			/* some error check here */
202			ok++;
203		} else if (strcmp(*argv, "bandwidth") == 0) {
204			NEXT_ARG();
205			if (get_rate(&rate, *argv)) {
206				fprintf(stderr, "Illegal \"bandwidth\"\n");
207				return -1;
208			}
209			ok++;
210		} else if (strcmp(*argv, "help") == 0) {
211			explain();
212			return -1;
213		} else {
214			fprintf(stderr, "What is \"%s\"?\n", *argv);
215			explain();
216			return -1;
217		}
218		argc--; argv++;
219	}
220
221	if (!ok)
222		return 0;
223
224	if (rate == 0)
225		get_rate(&rate, "10Mbit");
226
227	if (!opt.qth_min || !opt.qth_max || !burst || !opt.limit || !avpkt ||
228	    (opt.DP<0)) {
229		fprintf(stderr, "Required parameter (min, max, burst, limit, "
230		    "avpket, DP) is missing\n");
231		return -1;
232	}
233
234	if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
235		fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
236		return -1;
237	}
238	if (wlog >= 10)
239		fprintf(stderr, "GRED: WARNING. Burst %d seems to be to "
240		    "large.\n", burst);
241	opt.Wlog = wlog;
242	if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
243		fprintf(stderr, "GRED: failed to calculate probability.\n");
244		return -1;
245	}
246	opt.Plog = wlog;
247	if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
248	    {
249		fprintf(stderr, "GRED: failed to calculate idle damping "
250		    "table.\n");
251		return -1;
252	}
253	opt.Scell_log = wlog;
254
255	tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
256
257	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
258	addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
259	addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
260	tail->rta_len = (((void*)n)+NLMSG_ALIGN(n->nlmsg_len)) - (void*)tail;
261	return 0;
262}
263
264static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
265{
266	struct rtattr *tb[TCA_GRED_STAB+1];
267	struct tc_gred_qopt *qopt;
268	int i;
269	SPRINT_BUF(b1);
270	SPRINT_BUF(b2);
271	SPRINT_BUF(b3);
272	SPRINT_BUF(b4);
273	SPRINT_BUF(b5);
274
275	if (opt == NULL)
276		return 0;
277
278	memset(tb, 0, sizeof(tb));
279	parse_rtattr(tb, TCA_GRED_STAB, RTA_DATA(opt), RTA_PAYLOAD(opt));
280
281	if (tb[TCA_GRED_PARMS] == NULL)
282		return -1;
283#if 0
284	sopt = RTA_DATA(tb[TCA_GRED_DPS]);
285	if (RTA_PAYLOAD(tb[TCA_GRED_DPS])  < sizeof(*sopt)) {
286		printf("\n GRED DPs message smaller than expected\n");
287		return -1;
288		}
289
290	DPRINTF(f, "\n\tDPs:%d Default DP %d\n ",
291		sopt->DPs, sopt->def_DP);
292#endif
293	qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
294	if (RTA_PAYLOAD(tb[TCA_GRED_PARMS])  < sizeof(*qopt)*MAX_DPs) {
295		fprintf(f,"\n GRED received message smaller than expected\n");
296		return -1;
297		}
298
299
300#if 0
301
302	for (i=0;i<sopt->DPs;i++)
303#endif
304/* Bad hack! should really return a proper message as shown above*/
305
306	for (i=0;i<MAX_DPs;i++, qopt++) {
307		if (qopt->DP >= MAX_DPs) continue;
308		fprintf(f, "\n DP:%d (prio %d) Average Queue %s Measured "
309		    "Queue %s  ",
310			qopt->DP,
311			qopt->prio,
312			sprint_size(qopt->qave, b4),
313			sprint_size(qopt->backlog, b5));
314		fprintf(f, "\n\t Packet drops: %d (forced %d early %d)  ",
315			qopt->forced+qopt->early,
316			qopt->forced,
317			qopt->early);
318		fprintf(f, "\n\t Packet totals: %u (bytes %u)  ",
319			qopt->packets,
320			qopt->bytesin);
321		if (show_details)
322			fprintf(f, "\n limit %s min %s max %s ",
323				sprint_size(qopt->limit, b1),
324				sprint_size(qopt->qth_min, b2),
325				sprint_size(qopt->qth_max, b3));
326				fprintf(f, "ewma %u Plog %u Scell_log %u",
327				    qopt->Wlog, qopt->Plog, qopt->Scell_log);
328	}
329	return 0;
330}
331
332struct qdisc_util gred_qdisc_util = {
333	.id		= "gred",
334	.parse_qopt	= gred_parse_opt,
335	.print_qopt	= gred_print_opt,
336};
337