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Date: Fri, 18 Dec 2009 14:18:38 +0100
From: Christian Samsel <christian.samsel@...h-aachen.de>
To: netdev@...r.kernel.org
Cc: Stephen Hemminger <shemminger@...l.org>,
Christian Samsel <christian.samsel@...h-aachen.de>
Subject: [PATCH 2/2] improve netem reorder flexibility
supplementary patch for iproute2 to match kernel behavior.
Signed-off-by: Christian Samsel <christian.samsel@...h-aachen.de>
---
include/linux/pkt_sched.h | 21 +++++++++------
tc/q_netem.c | 61 ++++++++++++++++++++++++++++++++------------
2 files changed, 56 insertions(+), 26 deletions(-)
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index d51a2b3..2081195 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -473,19 +473,22 @@ enum
struct tc_netem_qopt
{
- __u32 latency; /* added delay (us) */
- __u32 limit; /* fifo limit (packets) */
- __u32 loss; /* random packet loss (0=none ~0=100%) */
- __u32 gap; /* re-ordering gap (0 for none) */
- __u32 duplicate; /* random packet dup (0=none ~0=100%) */
- __u32 jitter; /* random jitter in latency (us) */
+ __u32 latency; /* added delay (us) */
+ __u32 limit; /* fifo limit (packets) */
+ __u32 loss; /* random packet loss (0=none ~0=100%) */
+ __u32 gap; /* minimum re-ordering gap (0 for none) */
+ __u32 duplicate; /* random packet dup (0=none ~0=100%) */
+ __u32 jitter; /* random jitter in latency (us) */
+ __u32 reorderdelay; /* delay for reordered packets (us) */
+ __u32 reorderdelayjitter; /* random jitter for reordered packets (us) */
};
struct tc_netem_corr
{
- __u32 delay_corr; /* delay correlation */
- __u32 loss_corr; /* packet loss correlation */
- __u32 dup_corr; /* duplicate correlation */
+ __u32 delay_corr; /* delay correlation */
+ __u32 reorderdelay_corr; /* reorderdelay correlation */
+ __u32 loss_corr; /* packet loss correlation */
+ __u32 dup_corr; /* duplicate correlation */
};
struct tc_netem_reorder
diff --git a/tc/q_netem.c b/tc/q_netem.c
index d06932e..eac9dc5 100644
--- a/tc/q_netem.c
+++ b/tc/q_netem.c
@@ -28,13 +28,14 @@
static void explain(void)
{
fprintf(stderr,
-"Usage: ... netem [ limit PACKETS ] \n" \
-" [ delay TIME [ JITTER [CORRELATION]]]\n" \
-" [ distribution {uniform|normal|pareto|paretonormal} ]\n" \
-" [ drop PERCENT [CORRELATION]] \n" \
-" [ corrupt PERCENT [CORRELATION]] \n" \
-" [ duplicate PERCENT [CORRELATION]]\n" \
-" [ reorder PRECENT [CORRELATION] [ gap DISTANCE ]]\n");
+"Usage: ... netem [ limit PACKETS ]\n" \
+" [ delay TIME [JITTER [CORRELATION]] ]\n" \
+" [ distribution (uniform|normal|pareto|paretonormal) ]\n" \
+" [ drop PERCENT [CORRELATION] ]\n" \
+" [ corrupt PERCENT [CORRELATION] ]\n" \
+" [ duplicate PERCENT [CORRELATION] ]\n" \
+" [ ( reorder PRECENT [CORRELATION] | gap MINDISTANCE ) reorderdelay TIME [JITTER [CORRELATION]] ]\n" \
+);
}
static void explain1(const char *arg)
@@ -204,6 +205,29 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
return -1;
}
}
+
+ } else if (matches(*argv, "reorderdelay") == 0) {
+ NEXT_ARG();
+ if (get_ticks(&opt.reorderdelay, *argv)) {
+ explain1("reorderdelay");
+ return -1;
+ }
+ if (NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ if (get_ticks(&opt.reorderdelayjitter, *argv)) {
+ explain1("reorderdelay");
+ return -1;
+ }
+ if (NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ ++present[TCA_NETEM_CORR];
+ if (get_percent(&cor.reorderdelay_corr, *argv)) {
+ explain1("reorderdelay");
+ return -1;
+ }
+ }
+ }
+
} else if (matches(*argv, "corrupt") == 0) {
NEXT_ARG();
present[TCA_NETEM_CORRUPT] = 1;
@@ -260,19 +284,18 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
tail = NLMSG_TAIL(n);
if (reorder.probability) {
- if (opt.latency == 0) {
- fprintf(stderr, "reordering not possible without specifying some delay\n");
- }
if (opt.gap == 0)
- opt.gap = 1;
- } else if (opt.gap > 0) {
- fprintf(stderr, "gap specified without reorder probability\n");
- explain();
- return -1;
+ opt.gap = 1; /* set minimum reorder gap to 1 */
+ } else {
+ if ( opt.gap == 0 && opt.reorderdelay > 0) {
+ fprintf(stderr, "reorderdelay specified without reorder probability or gap\n");
+ explain();
+ return -1;
+ }
}
- if (dist_data && (opt.latency == 0 || opt.jitter == 0)) {
- fprintf(stderr, "distribution specified but no latency and jitter values\n");
+ if (dist_data && opt.jitter == 0 && opt.reorderjitter == 0) {
+ fprintf(stderr, "distribution specified but no delay or reorderdelay jitter values\n");
explain();
return -1;
}
@@ -345,6 +368,10 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
fprintf(f, "limit %d", qopt.limit);
+ if (qopt.reorderdelay) {
+ fprintf(f, " reorderdelay %s", sprint_ticks(qopt.reorderdelay, b1) );
+ }
+
if (qopt.latency) {
fprintf(f, " delay %s", sprint_ticks(qopt.latency, b1));
--
1.6.4.1
--
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