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Date: Mon, 23 Jun 2008 13:25:36 +0300
From: Jussi Kivilinna <jussi.kivilinna@...et.fi>
To: netdev@...r.kernel.org
Cc: Patrick McHardy <kaber@...sh.net>,
Stephen Hemminger <shemminger@...l.org>
Subject: [PATCH] [iproute2/tc] hfsc: add link layer overhead adaption
Patch adds 'mpu', 'mtu', 'overhead' and 'linklayer' options for rate table
creation. Rate table is only used and passed to kernel if these options are
used. Rate for rate table creation is selected so that kernel side can convert
packet length direct to emulate link layer packet length.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@...et.fi>
---
include/linux/pkt_sched.h | 2 +
tc/q_hfsc.c | 75 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 76 insertions(+), 1 deletions(-)
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index dbb7ac3..1d2cb24 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -316,6 +316,8 @@ enum
TCA_HFSC_RSC,
TCA_HFSC_FSC,
TCA_HFSC_USC,
+ TCA_HFSC_RATEOPTS,
+ TCA_HFSC_RTAB,
__TCA_HFSC_MAX,
};
diff --git a/tc/q_hfsc.c b/tc/q_hfsc.c
index b190c71..1b14237 100644
--- a/tc/q_hfsc.c
+++ b/tc/q_hfsc.c
@@ -42,6 +42,13 @@ explain_class(void)
{
fprintf(stderr,
"Usage: ... hfsc [ [ rt SC ] [ ls SC ] | [ sc SC ] ] [ ul SC ]\n"
+ " [ mtu BYTES] [ mpu BYTES ] [ overhead BYTES ]\n"
+ " [ linklayer TYPE ]\n"
+ "\n"
+ " mtu : max packet size we create rate map for {2047}\n"
+ " mpu : minimum packet size used in rate computations\n"
+ " overhead : per-packet size overhead used in rate computations\n"
+ " linklayer : adapting to a linklayer e.g. atm\n"
"\n"
"SC := [ [ m1 BPS ] [ d SEC ] m2 BPS\n"
"\n"
@@ -145,14 +152,45 @@ hfsc_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
struct tc_service_curve rsc, fsc, usc;
int rsc_ok, fsc_ok, usc_ok;
struct rtattr *tail;
+ struct tc_ratespec rateopts;
+ __u32 rtab[256];
+ int use_rtab;
+ unsigned mtu = 0;
+ unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
+ unsigned short overhead = 0, mpu = 0;
memset(&rsc, 0, sizeof(rsc));
memset(&fsc, 0, sizeof(fsc));
memset(&usc, 0, sizeof(usc));
+ memset(&rateopts, 0, sizeof(rateopts));
rsc_ok = fsc_ok = usc_ok = 0;
while (argc > 0) {
- if (matches(*argv, "rt") == 0) {
+ if (matches(*argv, "mtu") == 0) {
+ NEXT_ARG();
+ if (get_u32(&mtu, *argv, 10)) {
+ explain1("mtu");
+ return -1;
+ }
+ } else if (matches(*argv, "mpu") == 0) {
+ NEXT_ARG();
+ if (get_u16(&mpu, *argv, 10)) {
+ explain1("mpu");
+ 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, "rt") == 0) {
NEXT_ARG();
if (hfsc_get_sc(&argc, &argv, &rsc) < 0) {
explain1("rt");
@@ -205,6 +243,22 @@ hfsc_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
return -1;
}
+ /* Only use rtab when needed, mtu only defines rtab properties so
+ * it is not checked for. */
+ use_rtab = (linklayer != LINKLAYER_ETHERNET || mpu != 0 || overhead != 0);
+ if (use_rtab) {
+ /* Select rate value so that qdisc_l2t converts input bytes to
+ * linklayer bytes directly. */
+ rateopts.rate = tc_core_time2tick(TIME_UNITS_PER_SEC);
+ rateopts.mpu = mpu;
+ rateopts.overhead = overhead;
+ if (tc_calc_rtable(&rateopts, rtab, -1, mtu, linklayer) < 0) {
+ fprintf(stderr, "HFSC: failed to calculate rate "
+ "table.\n");
+ return -1;
+ }
+ }
+
tail = NLMSG_TAIL(n);
addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
@@ -214,6 +268,10 @@ hfsc_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
addattr_l(n, 1024, TCA_HFSC_FSC, &fsc, sizeof(fsc));
if (usc_ok)
addattr_l(n, 1024, TCA_HFSC_USC, &usc, sizeof(usc));
+ if (use_rtab) {
+ addattr_l(n, 2024, TCA_HFSC_RATEOPTS, &rateopts, sizeof(rateopts));
+ addattr_l(n, 3024, TCA_HFSC_RTAB, rtab, 1024);
+ }
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
return 0;
@@ -235,6 +293,8 @@ hfsc_print_class_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
struct rtattr *tb[TCA_HFSC_MAX+1];
struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL;
+ struct tc_ratespec *rateopts = NULL;
+ SPRINT_BUF(b1);
if (opt == NULL)
return 0;
@@ -259,6 +319,12 @@ hfsc_print_class_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
else
usc = RTA_DATA(tb[TCA_HFSC_USC]);
}
+ if (tb[TCA_HFSC_RATEOPTS]) {
+ if (RTA_PAYLOAD(tb[TCA_HFSC_RATEOPTS]) < sizeof(*rateopts))
+ fprintf(stderr, "HFSC: truncated rate options\n");
+ else
+ rateopts = RTA_DATA(tb[TCA_HFSC_RATEOPTS]);
+ }
if (rsc != NULL && fsc != NULL &&
@@ -273,6 +339,13 @@ hfsc_print_class_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
if (usc != NULL)
hfsc_print_sc(f, "ul", usc);
+ if (rateopts != NULL && show_details) {
+ if (rateopts->mpu)
+ fprintf(f, "mpu %s ", sprint_size(rateopts->mpu, b1));
+ if (rateopts->overhead)
+ fprintf(f, "overhead %s ", sprint_size(rateopts->overhead, b1));
+ }
+
return 0;
}
--
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