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Message-Id: <1322156415-23331-2-git-send-email-hagen@jauu.net>
Date: Thu, 24 Nov 2011 18:40:15 +0100
From: Hagen Paul Pfeifer <hagen@...u.net>
To: netdev@...r.kernel.org
Cc: Stephen Hemminger <shemminger@...tta.com>,
Hagen Paul Pfeifer <hagen@...u.net>
Subject: [PATCH iproute2 2/2] tc: netem ratelatency and cell extension
This patch add ratelatency as well as cell support. Ratelatency can be
added with ratelatency options. Three optional arguments control the
cell knobs: packet-overhead, cell-size, cell-overhead. To ratelimit eth0
root queue to 5kbit/s, with a 20 byte packet overhead, 100 byte cell
size and a 5 byte per cell overhead:
tc qdisc add dev eth0 root netem ratelatency 5kbit 20 100 5
Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net>
---
include/linux/pkt_sched.h | 8 ++++++
tc/q_netem.c | 53 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 60 insertions(+), 1 deletions(-)
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index c533670..76b26a2 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -465,6 +465,7 @@ enum {
TCA_NETEM_REORDER,
TCA_NETEM_CORRUPT,
TCA_NETEM_LOSS,
+ TCA_NETEM_RATELATENCY,
__TCA_NETEM_MAX,
};
@@ -495,6 +496,13 @@ struct tc_netem_corrupt {
__u32 correlation;
};
+struct tc_netem_ratelatency {
+ __u32 ratelatency; /* byte/s */
+ __s32 packet_overhead;
+ __u32 cell_size;
+ __s32 cell_overhead;
+};
+
enum {
NETEM_LOSS_UNSPEC,
NETEM_LOSS_GI, /* General Intuitive - 4 state model */
diff --git a/tc/q_netem.c b/tc/q_netem.c
index 6dc40bd..d6a3266 100644
--- a/tc/q_netem.c
+++ b/tc/q_netem.c
@@ -34,7 +34,8 @@ 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" \
+" [ ratelatency RATE [PACKETOVERHEAD] [CELLSIZE] [CELLOVERHEAD]]\n");
}
static void explain1(const char *arg)
@@ -131,6 +132,7 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
struct tc_netem_corr cor;
struct tc_netem_reorder reorder;
struct tc_netem_corrupt corrupt;
+ struct tc_netem_ratelatency ratelatency;
__s16 *dist_data = NULL;
int present[__TCA_NETEM_MAX];
@@ -139,6 +141,7 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
memset(&cor, 0, sizeof(cor));
memset(&reorder, 0, sizeof(reorder));
memset(&corrupt, 0, sizeof(corrupt));
+ memset(&ratelatency, 0, sizeof(ratelatency));
memset(present, 0, sizeof(present));
while (argc > 0) {
@@ -244,6 +247,34 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
free(dist_data);
return -1;
}
+ } else if (matches(*argv, "ratelatency") == 0) {
+ ++present[TCA_NETEM_RATELATENCY];
+ NEXT_ARG();
+ if (get_rate(&ratelatency.ratelatency, *argv)) {
+ explain1("ratelatency");
+ return -1;
+ }
+ if (NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ if (get_s32(&ratelatency.packet_overhead, *argv, 0)) {
+ explain1("ratelatency");
+ return -1;
+ }
+ }
+ if (NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ if (get_u32(&ratelatency.cell_size, *argv, 0)) {
+ explain1("ratelatency");
+ return -1;
+ }
+ }
+ if (NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ if (get_s32(&ratelatency.cell_overhead, *argv, 0)) {
+ explain1("ratelatency");
+ return -1;
+ }
+ }
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
@@ -290,6 +321,10 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
addattr_l(n, 1024, TCA_NETEM_CORRUPT, &corrupt, sizeof(corrupt)) < 0)
return -1;
+ if (present[TCA_NETEM_RATELATENCY] &&
+ addattr_l(n, 1024, TCA_NETEM_RATELATENCY, &ratelatency, sizeof(ratelatency)) < 0)
+ return -1;
+
if (dist_data) {
if (addattr_l(n, MAX_DIST * sizeof(dist_data[0]),
TCA_NETEM_DELAY_DIST,
@@ -306,6 +341,7 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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_ratelatency *ratelatency = NULL;
struct tc_netem_qopt qopt;
int len = RTA_PAYLOAD(opt) - sizeof(qopt);
SPRINT_BUF(b1);
@@ -339,6 +375,11 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
return -1;
corrupt = RTA_DATA(tb[TCA_NETEM_CORRUPT]);
}
+ if (tb[TCA_NETEM_RATELATENCY]) {
+ if (RTA_PAYLOAD(tb[TCA_NETEM_RATELATENCY]) < sizeof(*ratelatency))
+ return -1;
+ ratelatency = RTA_DATA(tb[TCA_NETEM_RATELATENCY]);
+ }
}
fprintf(f, "limit %d", qopt.limit);
@@ -382,6 +423,16 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
sprint_percent(corrupt->correlation, b1));
}
+ if (ratelatency && ratelatency->ratelatency) {
+ fprintf(f, " ratelatency %s", sprint_rate(ratelatency->ratelatency, b1));
+ if (ratelatency->packet_overhead)
+ fprintf(f, " packetoverhead %d", ratelatency->packet_overhead);
+ if (ratelatency->cell_size)
+ fprintf(f, " cellsize %u", ratelatency->cell_size);
+ if (ratelatency->cell_overhead)
+ fprintf(f, " celloverhead %d", ratelatency->cell_overhead);
+ }
+
if (qopt.gap)
fprintf(f, " gap %lu", (unsigned long)qopt.gap);
--
1.7.7
--
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