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iproute2/tc/q_cbq.c
Nishanth Devarajan 927e3cfb52 tc: B.W limits can now be specified in %. 
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>
2017-11-24 11:22:13 -08:00

601 lines
15 KiB
C
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/*
* q_cbq.c CBQ.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include "utils.h"
#include "tc_util.h"
#include "tc_cbq.h"
static void explain_class(void)
{
fprintf(stderr, "Usage: ... cbq bandwidth BPS rate BPS maxburst PKTS [ avpkt BYTES ]\n");
fprintf(stderr, " [ minburst PKTS ] [ bounded ] [ isolated ]\n");
fprintf(stderr, " [ allot BYTES ] [ mpu BYTES ] [ weight RATE ]\n");
fprintf(stderr, " [ prio NUMBER ] [ cell BYTES ] [ ewma LOG ]\n");
fprintf(stderr, " [ estimator INTERVAL TIME_CONSTANT ]\n");
fprintf(stderr, " [ split CLASSID ] [ defmap MASK/CHANGE ]\n");
fprintf(stderr, " [ overhead BYTES ] [ linklayer TYPE ]\n");
}
static void explain(void)
{
fprintf(stderr, "Usage: ... cbq bandwidth BPS avpkt BYTES [ mpu BYTES ]\n");
fprintf(stderr, " [ cell BYTES ] [ ewma LOG ]\n");
}
static void explain1(char *arg)
{
fprintf(stderr, "Illegal \"%s\"\n", arg);
}
static int cbq_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
{
struct tc_ratespec r = {};
struct tc_cbq_lssopt lss = {};
__u32 rtab[256];
unsigned mpu = 0, avpkt = 0, allot = 0;
unsigned short overhead = 0;
unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
int cell_log = -1;
int ewma_log = -1;
struct rtattr *tail;
while (argc > 0) {
if (matches(*argv, "bandwidth") == 0 ||
matches(*argv, "rate") == 0) {
NEXT_ARG();
if (strchr(*argv, '%')) {
if (get_percent_rate(&r.rate, *argv, dev)) {
explain1("bandwidth");
return -1;
}
} else if (get_rate(&r.rate, *argv)) {
explain1("bandwidth");
return -1;
}
} else if (matches(*argv, "ewma") == 0) {
NEXT_ARG();
if (get_integer(&ewma_log, *argv, 0)) {
explain1("ewma");
return -1;
}
if (ewma_log > 31) {
fprintf(stderr, "ewma_log must be < 32\n");
return -1;
}
} else if (matches(*argv, "cell") == 0) {
unsigned int cell;
int i;
NEXT_ARG();
if (get_size(&cell, *argv)) {
explain1("cell");
return -1;
}
for (i = 0; i < 32; i++)
if ((1<<i) == cell)
break;
if (i >= 32) {
fprintf(stderr, "cell must be 2^n\n");
return -1;
}
cell_log = i;
} else if (matches(*argv, "avpkt") == 0) {
NEXT_ARG();
if (get_size(&avpkt, *argv)) {
explain1("avpkt");
return -1;
}
} else if (matches(*argv, "mpu") == 0) {
NEXT_ARG();
if (get_size(&mpu, *argv)) {
explain1("mpu");
return -1;
}
} else if (matches(*argv, "allot") == 0) {
NEXT_ARG();
/* Accept and ignore "allot" for backward compatibility */
if (get_size(&allot, *argv)) {
explain1("allot");
return -1;
}
} else if (matches(*argv, "overhead") == 0) {
NEXT_ARG();
if (get_u16(&overhead, *argv, 10)) {
explain1("overhead"); return -1;
}
} else if (matches(*argv, "linklayer") == 0) {
NEXT_ARG();
if (get_linklayer(&linklayer, *argv)) {
explain1("linklayer"); return -1;
}
} else if (matches(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
return -1;
}
argc--; argv++;
}
/* OK. All options are parsed. */
if (r.rate == 0) {
fprintf(stderr, "CBQ: bandwidth is required parameter.\n");
return -1;
}
if (avpkt == 0) {
fprintf(stderr, "CBQ: \"avpkt\" is required.\n");
return -1;
}
if (allot < (avpkt*3)/2)
allot = (avpkt*3)/2;
r.mpu = mpu;
r.overhead = overhead;
if (tc_calc_rtable(&r, rtab, cell_log, allot, linklayer) < 0) {
fprintf(stderr, "CBQ: failed to calculate rate table.\n");
return -1;
}
if (ewma_log < 0)
ewma_log = TC_CBQ_DEF_EWMA;
lss.ewma_log = ewma_log;
lss.maxidle = tc_calc_xmittime(r.rate, avpkt);
lss.change = TCF_CBQ_LSS_MAXIDLE|TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
lss.avpkt = avpkt;
tail = NLMSG_TAIL(n);
addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
if (show_raw) {
int i;
for (i = 0; i < 256; i++)
printf("%u ", rtab[i]);
printf("\n");
}
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
return 0;
}
static int cbq_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
{
int wrr_ok = 0, fopt_ok = 0;
struct tc_ratespec r = {};
struct tc_cbq_lssopt lss = {};
struct tc_cbq_wrropt wrr = {};
struct tc_cbq_fopt fopt = {};
__u32 rtab[256];
unsigned mpu = 0;
int cell_log = -1;
int ewma_log = -1;
unsigned int bndw = 0;
unsigned minburst = 0, maxburst = 0;
unsigned short overhead = 0;
unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
struct rtattr *tail;
while (argc > 0) {
if (matches(*argv, "rate") == 0) {
NEXT_ARG();
if (strchr(*argv, '%')) {
if (get_percent_rate(&r.rate, *argv, dev)) {
explain1("rate");
return -1;
}
} else if (get_rate(&r.rate, *argv)) {
explain1("rate");
return -1;
}
} else if (matches(*argv, "bandwidth") == 0) {
NEXT_ARG();
if (strchr(*argv, '%')) {
if (get_percent_rate(&bndw, *argv, dev)) {
explain1("bandwidth");
return -1;
}
} else if (get_rate(&bndw, *argv)) {
explain1("bandwidth");
return -1;
}
} else if (matches(*argv, "minidle") == 0) {
NEXT_ARG();
if (get_u32(&lss.minidle, *argv, 0)) {
explain1("minidle");
return -1;
}
lss.change |= TCF_CBQ_LSS_MINIDLE;
} else if (matches(*argv, "minburst") == 0) {
NEXT_ARG();
if (get_u32(&minburst, *argv, 0)) {
explain1("minburst");
return -1;
}
lss.change |= TCF_CBQ_LSS_OFFTIME;
} else if (matches(*argv, "maxburst") == 0) {
NEXT_ARG();
if (get_u32(&maxburst, *argv, 0)) {
explain1("maxburst");
return -1;
}
lss.change |= TCF_CBQ_LSS_MAXIDLE;
} else if (matches(*argv, "bounded") == 0) {
lss.flags |= TCF_CBQ_LSS_BOUNDED;
lss.change |= TCF_CBQ_LSS_FLAGS;
} else if (matches(*argv, "borrow") == 0) {
lss.flags &= ~TCF_CBQ_LSS_BOUNDED;
lss.change |= TCF_CBQ_LSS_FLAGS;
} else if (matches(*argv, "isolated") == 0) {
lss.flags |= TCF_CBQ_LSS_ISOLATED;
lss.change |= TCF_CBQ_LSS_FLAGS;
} else if (matches(*argv, "sharing") == 0) {
lss.flags &= ~TCF_CBQ_LSS_ISOLATED;
lss.change |= TCF_CBQ_LSS_FLAGS;
} else if (matches(*argv, "ewma") == 0) {
NEXT_ARG();
if (get_integer(&ewma_log, *argv, 0)) {
explain1("ewma");
return -1;
}
if (ewma_log > 31) {
fprintf(stderr, "ewma_log must be < 32\n");
return -1;
}
lss.change |= TCF_CBQ_LSS_EWMA;
} else if (matches(*argv, "cell") == 0) {
unsigned int cell;
int i;
NEXT_ARG();
if (get_size(&cell, *argv)) {
explain1("cell");
return -1;
}
for (i = 0; i < 32; i++)
if ((1<<i) == cell)
break;
if (i >= 32) {
fprintf(stderr, "cell must be 2^n\n");
return -1;
}
cell_log = i;
} else if (matches(*argv, "prio") == 0) {
unsigned int prio;
NEXT_ARG();
if (get_u32(&prio, *argv, 0)) {
explain1("prio");
return -1;
}
if (prio > TC_CBQ_MAXPRIO) {
fprintf(stderr, "\"prio\" must be number in the range 1...%d\n", TC_CBQ_MAXPRIO);
return -1;
}
wrr.priority = prio;
wrr_ok++;
} else if (matches(*argv, "allot") == 0) {
NEXT_ARG();
if (get_size(&wrr.allot, *argv)) {
explain1("allot");
return -1;
}
} else if (matches(*argv, "avpkt") == 0) {
NEXT_ARG();
if (get_size(&lss.avpkt, *argv)) {
explain1("avpkt");
return -1;
}
lss.change |= TCF_CBQ_LSS_AVPKT;
} else if (matches(*argv, "mpu") == 0) {
NEXT_ARG();
if (get_size(&mpu, *argv)) {
explain1("mpu");
return -1;
}
} else if (matches(*argv, "weight") == 0) {
NEXT_ARG();
if (get_size(&wrr.weight, *argv)) {
explain1("weight");
return -1;
}
wrr_ok++;
} else if (matches(*argv, "split") == 0) {
NEXT_ARG();
if (get_tc_classid(&fopt.split, *argv)) {
fprintf(stderr, "Invalid split node ID.\n");
return -1;
}
fopt_ok++;
} else if (matches(*argv, "defmap") == 0) {
int err;
NEXT_ARG();
err = sscanf(*argv, "%08x/%08x", &fopt.defmap, &fopt.defchange);
if (err < 1) {
fprintf(stderr, "Invalid defmap, should be MASK32[/MASK]\n");
return -1;
}
if (err == 1)
fopt.defchange = ~0;
fopt_ok++;
} else if (matches(*argv, "overhead") == 0) {
NEXT_ARG();
if (get_u16(&overhead, *argv, 10)) {
explain1("overhead"); return -1;
}
} else if (matches(*argv, "linklayer") == 0) {
NEXT_ARG();
if (get_linklayer(&linklayer, *argv)) {
explain1("linklayer"); return -1;
}
} else if (matches(*argv, "help") == 0) {
explain_class();
return -1;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain_class();
return -1;
}
argc--; argv++;
}
/* OK. All options are parsed. */
/* 1. Prepare link sharing scheduler parameters */
if (r.rate) {
unsigned int pktsize = wrr.allot;
if (wrr.allot < (lss.avpkt*3)/2)
wrr.allot = (lss.avpkt*3)/2;
r.mpu = mpu;
r.overhead = overhead;
if (tc_calc_rtable(&r, rtab, cell_log, pktsize, linklayer) < 0) {
fprintf(stderr, "CBQ: failed to calculate rate table.\n");
return -1;
}
}
if (ewma_log < 0)
ewma_log = TC_CBQ_DEF_EWMA;
lss.ewma_log = ewma_log;
if (lss.change&(TCF_CBQ_LSS_OFFTIME|TCF_CBQ_LSS_MAXIDLE)) {
if (lss.avpkt == 0) {
fprintf(stderr, "CBQ: avpkt is required for max/minburst.\n");
return -1;
}
if (bndw == 0 || r.rate == 0) {
fprintf(stderr, "CBQ: bandwidth&rate are required for max/minburst.\n");
return -1;
}
}
if (wrr.priority == 0 && (n->nlmsg_flags&NLM_F_EXCL)) {
wrr_ok = 1;
wrr.priority = TC_CBQ_MAXPRIO;
if (wrr.allot == 0)
wrr.allot = (lss.avpkt*3)/2;
}
if (wrr_ok) {
if (wrr.weight == 0)
wrr.weight = (wrr.priority == TC_CBQ_MAXPRIO) ? 1 : r.rate;
if (wrr.allot == 0) {
fprintf(stderr, "CBQ: \"allot\" is required to set WRR parameters.\n");
return -1;
}
}
if (lss.change&TCF_CBQ_LSS_MAXIDLE) {
lss.maxidle = tc_cbq_calc_maxidle(bndw, r.rate, lss.avpkt, ewma_log, maxburst);
lss.change |= TCF_CBQ_LSS_MAXIDLE;
lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
}
if (lss.change&TCF_CBQ_LSS_OFFTIME) {
lss.offtime = tc_cbq_calc_offtime(bndw, r.rate, lss.avpkt, ewma_log, minburst);
lss.change |= TCF_CBQ_LSS_OFFTIME;
lss.change |= TCF_CBQ_LSS_EWMA|TCF_CBQ_LSS_AVPKT;
}
if (lss.change&TCF_CBQ_LSS_MINIDLE) {
lss.minidle <<= lss.ewma_log;
lss.change |= TCF_CBQ_LSS_EWMA;
}
tail = NLMSG_TAIL(n);
addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
if (lss.change) {
lss.change |= TCF_CBQ_LSS_FLAGS;
addattr_l(n, 1024, TCA_CBQ_LSSOPT, &lss, sizeof(lss));
}
if (wrr_ok)
addattr_l(n, 1024, TCA_CBQ_WRROPT, &wrr, sizeof(wrr));
if (fopt_ok)
addattr_l(n, 1024, TCA_CBQ_FOPT, &fopt, sizeof(fopt));
if (r.rate) {
addattr_l(n, 1024, TCA_CBQ_RATE, &r, sizeof(r));
addattr_l(n, 3024, TCA_CBQ_RTAB, rtab, 1024);
if (show_raw) {
int i;
for (i = 0; i < 256; i++)
printf("%u ", rtab[i]);
printf("\n");
}
}
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
return 0;
}
static int cbq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
struct rtattr *tb[TCA_CBQ_MAX+1];
struct tc_ratespec *r = NULL;
struct tc_cbq_lssopt *lss = NULL;
struct tc_cbq_wrropt *wrr = NULL;
struct tc_cbq_fopt *fopt = NULL;
struct tc_cbq_ovl *ovl = NULL;
unsigned int linklayer;
SPRINT_BUF(b1);
SPRINT_BUF(b2);
if (opt == NULL)
return 0;
parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
if (tb[TCA_CBQ_RATE]) {
if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
fprintf(stderr, "CBQ: too short rate opt\n");
else
r = RTA_DATA(tb[TCA_CBQ_RATE]);
}
if (tb[TCA_CBQ_LSSOPT]) {
if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
fprintf(stderr, "CBQ: too short lss opt\n");
else
lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
}
if (tb[TCA_CBQ_WRROPT]) {
if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
fprintf(stderr, "CBQ: too short wrr opt\n");
else
wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
}
if (tb[TCA_CBQ_FOPT]) {
if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
fprintf(stderr, "CBQ: too short fopt\n");
else
fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
}
if (tb[TCA_CBQ_OVL_STRATEGY]) {
if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
fprintf(stderr, "CBQ: too short overlimit strategy %u/%u\n",
(unsigned int) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
(unsigned int) sizeof(*ovl));
else
ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
}
if (r) {
char buf[64];
print_rate(buf, sizeof(buf), r->rate);
fprintf(f, "rate %s ", buf);
linklayer = (r->linklayer & TC_LINKLAYER_MASK);
if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b2));
if (show_details) {
fprintf(f, "cell %ub ", 1<<r->cell_log);
if (r->mpu)
fprintf(f, "mpu %ub ", r->mpu);
if (r->overhead)
fprintf(f, "overhead %ub ", r->overhead);
}
}
if (lss && lss->flags) {
int comma = 0;
fprintf(f, "(");
if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
fprintf(f, "bounded");
comma = 1;
}
if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
if (comma)
fprintf(f, ",");
fprintf(f, "isolated");
}
fprintf(f, ") ");
}
if (wrr) {
if (wrr->priority != TC_CBQ_MAXPRIO)
fprintf(f, "prio %u", wrr->priority);
else
fprintf(f, "prio no-transmit");
if (show_details) {
char buf[64];
fprintf(f, "/%u ", wrr->cpriority);
if (wrr->weight != 1) {
print_rate(buf, sizeof(buf), wrr->weight);
fprintf(f, "weight %s ", buf);
}
if (wrr->allot)
fprintf(f, "allot %ub ", wrr->allot);
}
}
if (lss && show_details) {
fprintf(f, "\nlevel %u ewma %u avpkt %ub ", lss->level, lss->ewma_log, lss->avpkt);
if (lss->maxidle) {
fprintf(f, "maxidle %s ", sprint_ticks(lss->maxidle>>lss->ewma_log, b1));
if (show_raw)
fprintf(f, "[%08x] ", lss->maxidle);
}
if (lss->minidle != 0x7fffffff) {
fprintf(f, "minidle %s ", sprint_ticks(lss->minidle>>lss->ewma_log, b1));
if (show_raw)
fprintf(f, "[%08x] ", lss->minidle);
}
if (lss->offtime) {
fprintf(f, "offtime %s ", sprint_ticks(lss->offtime, b1));
if (show_raw)
fprintf(f, "[%08x] ", lss->offtime);
}
}
if (fopt && show_details) {
char buf[64];
print_tc_classid(buf, sizeof(buf), fopt->split);
fprintf(f, "\nsplit %s ", buf);
if (fopt->defmap) {
fprintf(f, "defmap %08x", fopt->defmap);
}
}
return 0;
}
static int cbq_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
{
struct tc_cbq_xstats *st;
if (xstats == NULL)
return 0;
if (RTA_PAYLOAD(xstats) < sizeof(*st))
return -1;
st = RTA_DATA(xstats);
fprintf(f, " borrowed %u overactions %u avgidle %g undertime %g", st->borrows,
st->overactions, (double)st->avgidle, (double)st->undertime);
return 0;
}
struct qdisc_util cbq_qdisc_util = {
.id = "cbq",
.parse_qopt = cbq_parse_opt,
.print_qopt = cbq_print_opt,
.print_xstats = cbq_print_xstats,
.parse_copt = cbq_parse_class_opt,
.print_copt = cbq_print_opt,
};
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