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Date: Tue, 24 Jun 2008 11:55:20 +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 v2 2/2] [iproute2/tc] hfsc: add link layer overhead adaption
Patch adds 'mpu', 'mtu', 'overhead' and 'linklayer' options to hfsc. These
options are used to create size table for sch_hfsc. Size table is only used
and passed to kernel if these options are used.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@...et.fi>
---
include/linux/pkt_sched.h | 2 +
tc/q_hfsc.c | 71 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 72 insertions(+), 1 deletions(-)
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index b8366fb..43c11f2 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -326,6 +326,8 @@ enum
TCA_HFSC_RSC,
TCA_HFSC_FSC,
TCA_HFSC_USC,
+ TCA_HFSC_SZOPTS,
+ TCA_HFSC_STAB,
__TCA_HFSC_MAX,
};
diff --git a/tc/q_hfsc.c b/tc/q_hfsc.c
index b190c71..aa1c9b0 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_sizespec szopts;
+ __u16 stab[512];
+ int use_stab;
+ 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(&szopts, 0, sizeof(szopts));
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 +243,18 @@ hfsc_parse_class_opt(struct qdisc_util *qu, int argc, char **argv,
return -1;
}
+ /* Only use stab when needed, mtu only defines stab properties so
+ * it is not checked for. */
+ use_stab = (linklayer != LINKLAYER_ETHERNET || mpu != 0 || overhead != 0);
+ if (use_stab) {
+ szopts.mpu = mpu;
+ szopts.overhead = overhead;
+ if (tc_calc_stable(&szopts, stab, -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 +264,10 @@ 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_stab) {
+ addattr_l(n, 2024, TCA_HFSC_SZOPTS, &szopts, sizeof(szopts));
+ addattr_l(n, 3024, TCA_HFSC_STAB, stab, TC_STAB_SIZE);
+ }
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
return 0;
@@ -235,6 +289,8 @@ 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_sizespec *szopts = NULL;
+ SPRINT_BUF(b1);
if (opt == NULL)
return 0;
@@ -259,6 +315,12 @@ 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_SZOPTS]) {
+ if (RTA_PAYLOAD(tb[TCA_HFSC_SZOPTS]) < sizeof(*szopts))
+ fprintf(stderr, "HFSC: truncated rate options\n");
+ else
+ szopts = RTA_DATA(tb[TCA_HFSC_SZOPTS]);
+ }
if (rsc != NULL && fsc != NULL &&
@@ -273,6 +335,13 @@ hfsc_print_class_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
if (usc != NULL)
hfsc_print_sc(f, "ul", usc);
+ if (szopts != NULL && show_details) {
+ if (szopts->mpu)
+ fprintf(f, "mpu %s ", sprint_size(szopts->mpu, b1));
+ if (szopts->overhead)
+ fprintf(f, "overhead %s ", sprint_size(szopts->overhead, b1));
+ }
+
return 0;
}
--
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