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927e3cfb52
This patch adapts the tc command line interface to allow bandwidth limits to be specified as a percentage of the interface's capacity. Adding this functionality requires passing the specified device string to each class/qdisc which changes the prototype for a couple of functions: the .parse_qopt and .parse_copt interfaces. The device string is a required parameter for tc-qdisc and tc-class, and when not specified, the kernel returns ENODEV. In this patch, if the user tries to specify a bandwidth percentage without naming the device, we return an error from userspace. Signed-off-by: Nishanth Devarajan<ndev2021@gmail.com>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/*
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* q_multiq.c Multiqueue aware qdisc
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*
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* Copyright (c) 2008, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses>.
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*
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* Author: Alexander Duyck <alexander.h.duyck@intel.com>
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*
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* Original Authors: PJ Waskiewicz, <peter.p.waskiewicz.jr@intel.com> (RR)
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> (from PRIO)
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include "utils.h"
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#include "tc_util.h"
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static void explain(void)
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{
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fprintf(stderr, "Usage: ... multiq [help]\n");
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}
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static int multiq_parse_opt(struct qdisc_util *qu, int argc, char **argv,
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struct nlmsghdr *n, const char *dev)
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{
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struct tc_multiq_qopt opt = {};
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if (argc) {
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if (strcmp(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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explain();
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return -1;
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}
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}
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addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
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return 0;
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}
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static int multiq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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struct tc_multiq_qopt *qopt;
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if (opt == NULL)
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return 0;
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if (RTA_PAYLOAD(opt) < sizeof(*qopt))
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return 0;
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qopt = RTA_DATA(opt);
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fprintf(f, "bands %u/%u ", qopt->bands, qopt->max_bands);
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return 0;
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}
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struct qdisc_util multiq_qdisc_util = {
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.id = "multiq",
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.parse_qopt = multiq_parse_opt,
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.print_qopt = multiq_print_opt,
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};
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