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Date: Sun, 23 Dec 2007 20:54:56 +0100
From: Ariane Keller <ariane.keller@....ee.ethz.ch>
To: Ben Greear <greearb@...delatech.com>
CC: Ariane Keller <ariane.keller@....ee.ethz.ch>,
Patrick McHardy <kaber@...sh.net>,
Stephen Hemminger <shemminger@...ux-foundation.org>,
netdev@...r.kernel.org, Rainer Baumann <baumann@....ee.ethz.ch>
Subject: Re: [PATCH 0/2] netem: trace enhancement: iproute
The iproute patch is to big to send on the mailing list,
since the distribution data have changed the directory.
For ease of discussion I add the important changes in this mail.
signed-of-by: Ariane Keller <ariane.keller@....ee.ethz.ch
---
diff -uprN iproute2-2.6.23/netem/trace/flowseed.c
iproute2-2.6.23_buf/netem/trace/flowseed.c
--- iproute2-2.6.23/netem/trace/flowseed.c 1970-01-01 01:00:00.000000000
+0100
+++ iproute2-2.6.23_buf/netem/trace/flowseed.c 2007-12-12
08:43:01.000000000 +0100
@@ -0,0 +1,209 @@
+/* flowseed.c flowseedprocess to deliver values for packet delay,
+ * duplication, loss and curruption form userspace to netem
+ *
+ * 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: Ariane Keller <arkeller@...ethz.ch> ETH Zurich
+ * Rainer Baumann <baumann@...ert.net> ETH Zurich
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <signal.h>
+
+#include "utils.h"
+#include "linux/pkt_sched.h"
+
+#define DATA_PACKAGE 4000
+#define DATA_PACKAGE_ID DATA_PACKAGE + sizeof(unsigned int) + sizeof(int)
+#define TCA_BUF_MAX (64*1024)
+/* maximal amount of parallel flows */
+struct rtnl_handle rth;
+unsigned int loop;
+int infinity = 0;
+int fdflowseed;
+char *sendpkg;
+int fid;
+int initialized = 0;
+int semid;
+int moreData = 1, r = 0, rold = 0;
+FILE * file;
+
+
+int printfct(const struct sockaddr_nl *who,
+ struct nlmsghdr *n,
+ void *arg)
+{
+ struct {
+ struct nlmsghdr n;
+ struct tcmsg t;
+ char buf[TCA_BUF_MAX];
+ } req;
+ struct tcmsg *t = NLMSG_DATA(n);
+ struct rtattr *tail = NULL;
+ struct tc_netem_qopt opt;
+ memset(&opt, 0, sizeof(opt));
+
+ if(n->nlmsg_type == RTM_DELQDISC) {
+ goto outerr;
+ }
+ else if(n->nlmsg_type == RTM_NEWQDISC){
+ initialized = 1;
+
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_NEWQDISC;
+ req.t.tcm_family = AF_UNSPEC;
+ req.t.tcm_handle = t->tcm_handle;
+ req.t.tcm_parent = t->tcm_parent;
+ req.t.tcm_ifindex = t->tcm_ifindex;
+
+ tail = NLMSG_TAIL(&req.n);
+again:
+ if (loop <= 0 && !infinity){
+ goto out;
+ }
+ if ((r = read(fdflowseed, sendpkg + rold, DATA_PACKAGE - rold)) >= 0) {
+ if (r + rold < DATA_PACKAGE) {
+ /* Tail of input file reached,
+ set rest at start from next iteration */
+ rold = r;
+ fprintf(file, "flowseed: at end of file.\n");
+
+ if (lseek(fdflowseed, 0L, SEEK_SET) < 0){
+ perror("lseek reset");
+ goto out;
+ }
+ goto again;
+ }
+ r = 0;
+ rold = 0;
+ memcpy(sendpkg + DATA_PACKAGE, &fid, sizeof(int));
+ memcpy(sendpkg + DATA_PACKAGE + sizeof(int), &moreData, sizeof(int));
+
+ /* opt has to be added for each netem request */
+ if (addattr_l(&req.n, TCA_BUF_MAX, TCA_OPTIONS, &opt, sizeof(opt)) < 0){
+ perror("add options");
+ return -1;
+ }
+
+ if(addattr_l(&req.n, TCA_BUF_MAX, TCA_NETEM_TRACE_DATA, sendpkg,
DATA_PACKAGE_ID) < 0){
+ perror("add data\n");
+ return -1;
+ }
+
+ tail->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)tail;
+
+ if(rtnl_send(&rth, (char*)&req, req.n.nlmsg_len) < 0){
+ perror("send data");
+ return -1;
+ }
+ return 0;
+ }
+ }
+/* no more data, what to do? we send a notification to the kernel module */
+out:
+ fprintf(stderr, "flowseed: Tail of input file reached. Exit.\n");
+ fprintf(file, "flowseed: Tail of input file reached. Exit.\n");
+ moreData = 0;
+ memcpy(sendpkg + DATA_PACKAGE, &fid, sizeof(int));
+ memcpy(sendpkg + DATA_PACKAGE + sizeof(int), &moreData, sizeof(int));
+ if (addattr_l(&req.n, TCA_BUF_MAX, TCA_OPTIONS, &opt, sizeof(opt)) < 0){
+ perror("add options");
+ goto outerr;
+ }
+ if(addattr_l(&req.n, TCA_BUF_MAX, TCA_NETEM_TRACE_DATA, sendpkg,
DATA_PACKAGE_ID) < 0){
+ perror("add data\n");
+ goto outerr;
+ }
+
+ tail->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)tail;
+
+ if(rtnl_send(&rth, (char*)&req, req.n.nlmsg_len) < 0){
+ perror("rtnl_send");
+ }
+outerr:
+ fprintf(file, "flowseed: outerr Exit.\n");
+ fclose(file);
+ close(fdflowseed);
+ free(sendpkg);
+ rtnl_close(&rth);
+ exit(0);
+}
+
+void sigact(int signal){
+ if(initialized){
+ return;
+ }
+ else{
+ fprintf(stderr, "flowseed: not yet initialized. Exit\n");
+ exit(0);
+ }
+}
+int main(int argc, char *argv[])
+{
+ struct sembuf buf;
+ file = fopen("flowseedout.txt", "a+");
+ fprintf(file, "flowseed: initial msg.\n");
+
+ if (argc < 3) {
+ printf("usage: <tracefilename> <loop>");
+ return -1;
+ }
+ loop = strtoul(argv[2], NULL, 10);
+ if (loop == 0)
+ infinity = 1;
+
+ if ((fdflowseed = open(argv[1], O_RDONLY, 0)) < 0) {
+ perror("cannot open tracefile");
+ return -1;
+ }
+
+ fid = getpid();
+ sendpkg = malloc(DATA_PACKAGE_ID);
+
+ if (rtnl_open(&rth, 0) < 0) {
+ perror("Cannot open rtnetlink");
+ return -1;
+ }
+ ll_init_map(&rth);
+ /* we are ready to receive notifications */
+ if((semid = semget(0x12345678, 1, IPC_CREAT | 0666))<0){
+ perror("semget");
+ return -1;
+ }
+ buf.sem_num = 0;
+ buf.sem_op = +1;
+ buf.sem_flg = SEM_UNDO;
+ if(semop(semid, &buf, 1) < 0){
+ perror("semop");
+ return -1;
+ }
+ /* if the user typed an invalid command we cannot detect this
+ * therefore we set a timer, if the timer expires before we receive
+ * any message from the kernel module, we assume there was an
+ * error and quit.
+ */
+ signal(SIGALRM, sigact);
+ alarm(3);
+
+ /* listen to notifications from kernel */
+ if (rtnl_listen(&rth, printfct, NULL) < 0) {
+ perror("listen");
+ rtnl_close(&rth);
+ exit(2);
+ }
+ return 0;
+}
diff -uprN iproute2-2.6.23/tc/q_netem.c iproute2-2.6.23_buf/tc/q_netem.c
--- iproute2-2.6.23/tc/q_netem.c 2007-10-16 23:27:42.000000000 +0200
+++ iproute2-2.6.23_buf/tc/q_netem.c 2007-12-21 19:08:19.000000000 +0100
@@ -6,7 +6,12 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
+ * README files: iproute2/netem/distribution
+ * iproute2/netem/trace
+ *
* Authors: Stephen Hemminger <shemminger@...l.org>
+ * netem trace: Ariane Keller <arkeller@...ethz.ch> ETH Zurich
+ * Rainer Baumann <baumann@...ert.net> ETH Zurich
*
*/
@@ -20,6 +25,9 @@
#include <arpa/inet.h>
#include <string.h>
#include <errno.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
#include "utils.h"
#include "tc_util.h"
@@ -34,7 +42,8 @@ static void explain(void)
" [ drop PERCENT [CORRELATION]] \n" \
" [ corrupt PERCENT [CORRELATION]] \n" \
" [ duplicate PERCENT [CORRELATION]]\n" \
-" [ reorder PRECENT [CORRELATION] [ gap DISTANCE ]]\n");
+" [ reorder PRECENT [CORRELATION] [ gap DISTANCE ]]\n" \
+" [ trace PATH buf NR_BUFS loops NR_LOOPS [DEFAULT]\n");
}
static void explain1(const char *arg)
@@ -42,6 +51,7 @@ static void explain1(const char *arg)
fprintf(stderr, "Illegal \"%s\"\n", arg);
}
+#define FLOWPATH "/usr/local/bin/flowseed"
#define usage() return(-1)
/*
@@ -129,6 +139,7 @@ static int netem_parse_opt(struct qdisc_
struct tc_netem_corr cor;
struct tc_netem_reorder reorder;
struct tc_netem_corrupt corrupt;
+ struct tc_netem_trace traceopt;
__s16 *dist_data = NULL;
int present[__TCA_NETEM_MAX];
@@ -137,8 +148,12 @@ static int netem_parse_opt(struct qdisc_
memset(&cor, 0, sizeof(cor));
memset(&reorder, 0, sizeof(reorder));
memset(&corrupt, 0, sizeof(corrupt));
+ memset(&traceopt, 0, sizeof(traceopt));
memset(present, 0, sizeof(present));
-
+ if (argc == 0) {
+ explain();
+ return -1;
+ }
while (argc > 0) {
if (matches(*argv, "limit") == 0) {
NEXT_ARG();
@@ -164,7 +179,7 @@ static int netem_parse_opt(struct qdisc_
if (NEXT_IS_NUMBER()) {
NEXT_ARG();
++present[TCA_NETEM_CORR];
- if (get_percent(&cor.delay_corr, *argv)) {
+ if (get_percent(&cor.delay_corr, *argv)) {
explain1("latency");
return -1;
}
@@ -243,6 +258,75 @@ static int netem_parse_opt(struct qdisc_
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
+ } else if (strcmp(*argv, "trace") == 0) {
+ int fd;
+ int execvl;
+ char *filename;
+ int pid;
+
+ /*get ticks correct since tracefile is in us,
+ *and ticks may not be equal to us
+ */
+ get_ticks(&traceopt.ticks, "1000us");
+ NEXT_ARG();
+ filename = *argv;
+ if ((fd = open(filename, O_RDONLY, 0)) < 0) {
+ fprintf(stderr, "Cannot open trace file %s! \n", filename);
+ return -1;
+ }
+ close(fd);
+ NEXT_ARG();
+ if(strcmp(*argv, "buf") == 0) {
+ NEXT_ARG();
+ traceopt.nr_bufs = atoi(*argv);
+ }
+ else{
+ explain();
+ return -1;
+ }
+ NEXT_ARG();
+ if (strcmp(*argv, "loops") == 0 && NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ /*child will load tracefile to kernel */
+ switch (pid = fork()) {
+ case -1:{
+ fprintf(stderr,
+ "Cannot fork\n");
+ return -1;
+ }
+ case 0:{
+ execvl = execl(FLOWPATH, "flowseed", filename, *argv, NULL);
+ if (execvl < 0) {
+ fprintf(stderr,
+ "starting child failed\n");
+ return -1;
+ }
+ }
+ default:{
+ /* parent has to wait until child has done rtnl_open.
+ * otherwise the kernel module cannot send a notification
+ * to the child
+ */
+ int semid = semget(0x12345678, 1, IPC_CREAT | 0666);
+ struct sembuf buf;
+ buf.sem_num = 0;
+ buf.sem_op = -1;
+ buf.sem_flg = SEM_UNDO;
+ semop(semid, &buf, 1);
+ semctl(semid, 0, IPC_RMID);
+ }
+ }
+ }
+ else {
+ explain();
+ return -1;
+ }
+ traceopt.def = 0;
+ if (NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ traceopt.def = atoi(*argv);
+ }
+ traceopt.fid = pid;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
@@ -291,7 +375,13 @@ static int netem_parse_opt(struct qdisc_
dist_data, dist_size*sizeof(dist_data[0])) < 0)
return -1;
}
- tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+ if (traceopt.fid) {
+ if (addattr_l(n, TCA_BUF_MAX, TCA_NETEM_TRACE, &traceopt,
+ sizeof(traceopt)) < 0)
+ return -1;
+ }
+
+ tail->rta_len = (void *)NLMSG_TAIL(n) - (void *)tail;
return 0;
}
@@ -300,6 +390,8 @@ static int netem_print_opt(struct qdisc_
const struct tc_netem_corr *cor = NULL;
const struct tc_netem_reorder *reorder = NULL;
const struct tc_netem_corrupt *corrupt = NULL;
+ const struct tc_netem_trace *traceopt = NULL;
+ const struct tc_netem_stats *tracestats = NULL;
struct tc_netem_qopt qopt;
int len = RTA_PAYLOAD(opt) - sizeof(qopt);
SPRINT_BUF(b1);
@@ -333,9 +425,31 @@ static int netem_print_opt(struct qdisc_
return -1;
corrupt = RTA_DATA(tb[TCA_NETEM_CORRUPT]);
}
+ if (tb[TCA_NETEM_TRACE]) {
+ if (RTA_PAYLOAD(tb[TCA_NETEM_TRACE]) < sizeof(*traceopt))
+ return -1;
+ traceopt = RTA_DATA(tb[TCA_NETEM_TRACE]);
+ }
+ if (tb[TCA_NETEM_STATS]) {
+ if (RTA_PAYLOAD(tb[TCA_NETEM_STATS]) < sizeof(*tracestats))
+ return -1;
+ tracestats = RTA_DATA(tb[TCA_NETEM_STATS]);
+ }
}
fprintf(f, "limit %d", qopt.limit);
+ if (traceopt && traceopt->fid) {
+ fprintf(f, " trace\n");
+
+ fprintf(f, "packetcount= %d\n", tracestats->packetcount);
+ fprintf(f, "packetok= %d\n", tracestats->packetok);
+ fprintf(f, "normaldelay= %d\n", tracestats->normaldelay);
+ fprintf(f, "drops= %d\n", tracestats->drops);
+ fprintf(f, "dupl= %d\n", tracestats->dupl);
+ fprintf(f, "corrupt= %d\n", tracestats->corrupt);
+ fprintf(f, "novaliddata= %d\n", tracestats->novaliddata);
+ fprintf(f, "bufferreload= %d\n", tracestats->reloadbuffer);
+ }
if (qopt.latency) {
fprintf(f, " delay %s", sprint_ticks(qopt.latency, b1));
--
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