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      1 /*
      2  * q_rr.c		RR.
      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:	PJ Waskiewicz, <peter.p.waskiewicz.jr (at) intel.com>
     10  * Original Authors:	Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru> (from PRIO)
     11  */
     12 
     13 #include <stdio.h>
     14 #include <stdlib.h>
     15 #include <unistd.h>
     16 #include <syslog.h>
     17 #include <fcntl.h>
     18 #include <sys/socket.h>
     19 #include <netinet/in.h>
     20 #include <arpa/inet.h>
     21 #include <string.h>
     22 
     23 #include "utils.h"
     24 #include "tc_util.h"
     25 
     26 static void explain(void)
     27 {
     28 	fprintf(stderr, "Usage: ... rr bands NUMBER priomap P1 P2... [multiqueue]\n");
     29 }
     30 
     31 
     32 static int rr_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
     33 {
     34 	int pmap_mode = 0;
     35 	int idx = 0;
     36 	struct tc_prio_qopt opt = {3, { 1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 } };
     37 	struct rtattr *nest;
     38 	unsigned char mq = 0;
     39 
     40 	while (argc > 0) {
     41 		if (strcmp(*argv, "bands") == 0) {
     42 			if (pmap_mode)
     43 				explain();
     44 			NEXT_ARG();
     45 			if (get_integer(&opt.bands, *argv, 10)) {
     46 				fprintf(stderr, "Illegal \"bands\"\n");
     47 				return -1;
     48 			}
     49 		} else if (strcmp(*argv, "priomap") == 0) {
     50 			if (pmap_mode) {
     51 				fprintf(stderr, "Error: duplicate priomap\n");
     52 				return -1;
     53 			}
     54 			pmap_mode = 1;
     55 		} else if (strcmp(*argv, "help") == 0) {
     56 			explain();
     57 			return -1;
     58 		} else if (strcmp(*argv, "multiqueue") == 0) {
     59 			mq = 1;
     60 		} else {
     61 			unsigned int band;
     62 
     63 			if (!pmap_mode) {
     64 				fprintf(stderr, "What is \"%s\"?\n", *argv);
     65 				explain();
     66 				return -1;
     67 			}
     68 			if (get_unsigned(&band, *argv, 10)) {
     69 				fprintf(stderr, "Illegal \"priomap\" element\n");
     70 				return -1;
     71 			}
     72 			if (band > opt.bands) {
     73 				fprintf(stderr, "\"priomap\" element is out of bands\n");
     74 				return -1;
     75 			}
     76 			if (idx > TC_PRIO_MAX) {
     77 				fprintf(stderr, "\"priomap\" index > TC_RR_MAX=%u\n", TC_PRIO_MAX);
     78 				return -1;
     79 			}
     80 			opt.priomap[idx++] = band;
     81 		}
     82 		argc--; argv++;
     83 	}
     84 
     85 	nest = addattr_nest_compat(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
     86 	if (mq)
     87 		addattr_l(n, 1024, TCA_PRIO_MQ, NULL, 0);
     88 	addattr_nest_compat_end(n, nest);
     89 	return 0;
     90 }
     91 
     92 static int rr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
     93 {
     94 	int i;
     95 	struct tc_prio_qopt *qopt;
     96 	struct rtattr *tb[TCA_PRIO_MAX + 1];
     97 
     98 	if (opt == NULL)
     99 		return 0;
    100 
    101 	if (parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt,
    102 						sizeof(*qopt)))
    103 		return -1;
    104 
    105 	fprintf(f, "bands %u priomap ", qopt->bands);
    106 	for (i = 0; i <= TC_PRIO_MAX; i++)
    107 		fprintf(f, " %d", qopt->priomap[i]);
    108 
    109 	if (tb[TCA_PRIO_MQ])
    110 		fprintf(f, " multiqueue: %s ",
    111 			rta_getattr_u8(tb[TCA_PRIO_MQ]) ? "on" : "off");
    112 
    113 	return 0;
    114 }
    115 
    116 struct qdisc_util rr_qdisc_util = {
    117 	.id		= "rr",
    118 	.parse_qopt	= rr_parse_opt,
    119 	.print_qopt	= rr_print_opt,
    120 };
    121