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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 band;
     62 			if (!pmap_mode) {
     63 				fprintf(stderr, "What is \"%s\"?\n", *argv);
     64 				explain();
     65 				return -1;
     66 			}
     67 			if (get_unsigned(&band, *argv, 10)) {
     68 				fprintf(stderr, "Illegal \"priomap\" element\n");
     69 				return -1;
     70 			}
     71 			if (band > opt.bands) {
     72 				fprintf(stderr, "\"priomap\" element is out of bands\n");
     73 				return -1;
     74 			}
     75 			if (idx > TC_PRIO_MAX) {
     76 				fprintf(stderr, "\"priomap\" index > TC_RR_MAX=%u\n", TC_PRIO_MAX);
     77 				return -1;
     78 			}
     79 			opt.priomap[idx++] = band;
     80 		}
     81 		argc--; argv++;
     82 	}
     83 
     84 	nest = addattr_nest_compat(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
     85 	if (mq)
     86 		addattr_l(n, 1024, TCA_PRIO_MQ, NULL, 0);
     87 	addattr_nest_compat_end(n, nest);
     88 	return 0;
     89 }
     90 
     91 int rr_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
     92 {
     93 	int i;
     94 	struct tc_prio_qopt *qopt;
     95 	struct rtattr *tb[TCA_PRIO_MAX + 1];
     96 
     97 	if (opt == NULL)
     98 		return 0;
     99 
    100 	if (parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt,
    101 						sizeof(*qopt)))
    102 		return -1;
    103 
    104 	fprintf(f, "bands %u priomap ", qopt->bands);
    105 	for (i=0; i <= TC_PRIO_MAX; i++)
    106 		fprintf(f, " %d", qopt->priomap[i]);
    107 
    108 	if (tb[TCA_PRIO_MQ])
    109 		fprintf(f, " multiqueue: %s ",
    110 		    *(unsigned char *)RTA_DATA(tb[TCA_PRIO_MQ]) ? "on" : "off");
    111 
    112 	return 0;
    113 }
    114 
    115 struct qdisc_util rr_qdisc_util = {
    116 	.id	 	= "rr",
    117 	.parse_qopt	= rr_parse_opt,
    118 	.print_qopt	= rr_print_opt,
    119 };
    120