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
49static int init_gred(struct qdisc_util *qu, int argc, char **argv,
50		     struct nlmsghdr *n)
51{
52
53	struct rtattr *tail;
54	struct tc_gred_sopt opt;
55	int dps = 0;
56	int def_dp = -1;
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			dps = strtol(*argv, (char **)NULL, 10);
64			if (dps < 0 || dps >MAX_DPs) {
65				fprintf(stderr, "DPs =%d\n", 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			def_dp = strtol(*argv, (char **)NULL, 10);
74			if (dps == 0) {
75				fprintf(stderr, "\"default DP\" must be "
76					"defined after DPs\n");
77				return -1;
78			}
79			if (def_dp < 0 || def_dp > dps) {
80				fprintf(stderr,
81					"\"default DP\" must be less than %d\n",
82					opt.DPs);
83				return -1;
84			}
85		} else if (strcmp(*argv, "grio") == 0) {
86			opt.grio=1;
87		} else if (strcmp(*argv, "help") == 0) {
88			explain();
89			return -1;
90		} else {
91			fprintf(stderr, "What is \"%s\"?\n", *argv);
92			explain();
93			return -1;
94		}
95		argc--; argv++;
96	}
97
98	if (!dps || def_dp == -1) {
99		fprintf(stderr, "Illegal gred setup parameters \n");
100		return -1;
101	}
102
103	memset(&opt, 0, sizeof(struct tc_gred_sopt));
104	opt.DPs = dps;
105	opt.def_DP = def_dp;
106
107	DPRINTF("TC_GRED: sending DPs=%d default=%d\n",opt.DPs,opt.def_DP);
108	n->nlmsg_flags|=NLM_F_CREATE;
109	tail = NLMSG_TAIL(n);
110	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
111	addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
112	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
113	return 0;
114}
115/*
116^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
117*/
118static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
119{
120	int ok=0;
121	struct tc_gred_qopt opt;
122	unsigned burst = 0;
123	unsigned avpkt = 0;
124	double probability = 0.02;
125	unsigned rate = 0;
126	int wlog;
127	__u8 sbuf[256];
128	struct rtattr *tail;
129
130	memset(&opt, 0, sizeof(opt));
131
132	while (argc > 0) {
133		if (strcmp(*argv, "limit") == 0) {
134			NEXT_ARG();
135			if (get_size(&opt.limit, *argv)) {
136				fprintf(stderr, "Illegal \"limit\"\n");
137				return -1;
138			}
139			ok++;
140		} else if (strcmp(*argv, "setup") == 0) {
141			if (ok) {
142				fprintf(stderr, "Illegal \"setup\"\n");
143				return -1;
144			}
145		return init_gred(qu,argc-1, argv+1,n);
146
147		} else if (strcmp(*argv, "min") == 0) {
148			NEXT_ARG();
149			if (get_size(&opt.qth_min, *argv)) {
150				fprintf(stderr, "Illegal \"min\"\n");
151				return -1;
152			}
153			ok++;
154		} else if (strcmp(*argv, "max") == 0) {
155			NEXT_ARG();
156			if (get_size(&opt.qth_max, *argv)) {
157				fprintf(stderr, "Illegal \"max\"\n");
158				return -1;
159			}
160			ok++;
161		} else if (strcmp(*argv, "DP") == 0) {
162			NEXT_ARG();
163			opt.DP=strtol(*argv, (char **)NULL, 10);
164			DPRINTF ("\n ******* DP =%u\n",opt.DP);
165			if (opt.DP >MAX_DPs) { /* need a better error check */
166				fprintf(stderr, "DP =%u \n",opt.DP);
167				fprintf(stderr, "Illegal \"DP\"\n");
168				fprintf(stderr, "GRED: only %d DPs are currently supported\n",MAX_DPs);
169				return -1;
170			}
171			ok++;
172		} else if (strcmp(*argv, "burst") == 0) {
173			NEXT_ARG();
174                        if (get_unsigned(&burst, *argv, 0)) {
175				fprintf(stderr, "Illegal \"burst\"\n");
176				return -1;
177			}
178			ok++;
179		} else if (strcmp(*argv, "avpkt") == 0) {
180			NEXT_ARG();
181			if (get_size(&avpkt, *argv)) {
182				fprintf(stderr, "Illegal \"avpkt\"\n");
183				return -1;
184			}
185			ok++;
186		} else if (strcmp(*argv, "probability") == 0) {
187			NEXT_ARG();
188			if (sscanf(*argv, "%lg", &probability) != 1) {
189				fprintf(stderr, "Illegal \"probability\"\n");
190				return -1;
191			}
192			ok++;
193		} else if (strcmp(*argv, "prio") == 0) {
194			NEXT_ARG();
195			opt.prio=strtol(*argv, (char **)NULL, 10);
196			/* some error check here */
197			ok++;
198		} else if (strcmp(*argv, "bandwidth") == 0) {
199			NEXT_ARG();
200			if (get_rate(&rate, *argv)) {
201				fprintf(stderr, "Illegal \"bandwidth\"\n");
202				return -1;
203			}
204			ok++;
205		} else if (strcmp(*argv, "help") == 0) {
206			explain();
207			return -1;
208		} else {
209			fprintf(stderr, "What is \"%s\"?\n", *argv);
210			explain();
211			return -1;
212		}
213		argc--; argv++;
214	}
215
216	if (rate == 0)
217		get_rate(&rate, "10Mbit");
218
219	if (!opt.qth_min || !opt.qth_max || !burst || !opt.limit || !avpkt ||
220	    (opt.DP<0)) {
221		fprintf(stderr, "Required parameter (min, max, burst, limit, "
222		    "avpkt, DP) is missing\n");
223		return -1;
224	}
225
226	if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
227		fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
228		return -1;
229	}
230	if (wlog >= 10)
231		fprintf(stderr, "GRED: WARNING. Burst %d seems to be to "
232		    "large.\n", burst);
233	opt.Wlog = wlog;
234	if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
235		fprintf(stderr, "GRED: failed to calculate probability.\n");
236		return -1;
237	}
238	opt.Plog = wlog;
239	if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
240	    {
241		fprintf(stderr, "GRED: failed to calculate idle damping "
242		    "table.\n");
243		return -1;
244	}
245	opt.Scell_log = wlog;
246
247	tail = NLMSG_TAIL(n);
248	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
249	addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
250	addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
251	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
252	return 0;
253}
254
255static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
256{
257	struct rtattr *tb[TCA_GRED_STAB+1];
258	struct tc_gred_qopt *qopt;
259	int i;
260	SPRINT_BUF(b1);
261	SPRINT_BUF(b2);
262	SPRINT_BUF(b3);
263	SPRINT_BUF(b4);
264	SPRINT_BUF(b5);
265
266	if (opt == NULL)
267		return 0;
268
269	parse_rtattr_nested(tb, TCA_GRED_STAB, opt);
270
271	if (tb[TCA_GRED_PARMS] == NULL)
272		return -1;
273
274	qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
275	if (RTA_PAYLOAD(tb[TCA_GRED_PARMS])  < sizeof(*qopt)*MAX_DPs) {
276		fprintf(f,"\n GRED received message smaller than expected\n");
277		return -1;
278		}
279
280/* Bad hack! should really return a proper message as shown above*/
281
282	for (i=0;i<MAX_DPs;i++, qopt++) {
283		if (qopt->DP >= MAX_DPs) continue;
284		fprintf(f, "\n DP:%d (prio %d) Average Queue %s Measured "
285		    "Queue %s  ",
286			qopt->DP,
287			qopt->prio,
288			sprint_size(qopt->qave, b4),
289			sprint_size(qopt->backlog, b5));
290		fprintf(f, "\n\t Packet drops: %d (forced %d early %d)  ",
291			qopt->forced+qopt->early,
292			qopt->forced,
293			qopt->early);
294		fprintf(f, "\n\t Packet totals: %u (bytes %u)  ",
295			qopt->packets,
296			qopt->bytesin);
297		if (show_details)
298			fprintf(f, "\n limit %s min %s max %s ",
299				sprint_size(qopt->limit, b1),
300				sprint_size(qopt->qth_min, b2),
301				sprint_size(qopt->qth_max, b3));
302				fprintf(f, "ewma %u Plog %u Scell_log %u",
303				    qopt->Wlog, qopt->Plog, qopt->Scell_log);
304	}
305	return 0;
306}
307
308struct qdisc_util gred_qdisc_util = {
309	.id		= "gred",
310	.parse_qopt	= gred_parse_opt,
311	.print_qopt	= gred_print_opt,
312};
313