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tc: gred: Add support for TCA_GRED_LIMIT attribute 

Allow the qdisc limit to be set, which is particularly useful when
the default VQ is not configured with RED parameters.

Signed-off-by: David Ward <david.ward@ll.mit.edu>
This commit is contained in:
David Ward 2015-05-18 11:35:14 -04:00 committed by Stephen Hemminger
parent b6ec53e300
commit aacee2695a
1 changed files with 19 additions and 1 deletions
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20
tc/q_gred.c
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@ -38,7 +38,7 @@
static void explain(void)
{
fprintf(stderr, "Usage: tc qdisc { add | replace | change } ... gred setup vqs NUMBER\n");
fprintf(stderr, " default DEFAULT_VQ [ grio ]\n");
fprintf(stderr, " default DEFAULT_VQ [ grio ] [ limit BYTES ]\n");
fprintf(stderr, " tc qdisc change ... gred vq VQ [ prio VALUE ] limit BYTES\n");
fprintf(stderr, " min BYTES max BYTES avpkt BYTES [ burst PACKETS ]\n");
fprintf(stderr, " [ probability PROBABILITY ] [ bandwidth KBPS ]\n");
@ -50,6 +50,7 @@ static int init_gred(struct qdisc_util *qu, int argc, char **argv,
struct rtattr *tail;
struct tc_gred_sopt opt = { 0 };
__u32 limit = 0;
opt.def_DP = MAX_DPs;
@ -83,6 +84,12 @@ static int init_gred(struct qdisc_util *qu, int argc, char **argv,
}
} else if (strcmp(*argv, "grio") == 0) {
opt.grio = 1;
} else if (strcmp(*argv, "limit") == 0) {
NEXT_ARG();
if (get_size(&limit, *argv)) {
fprintf(stderr, "Illegal \"limit\"\n");
return -1;
}
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
@ -104,6 +111,8 @@ static int init_gred(struct qdisc_util *qu, int argc, char **argv,
tail = NLMSG_TAIL(n);
addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
if (limit)
addattr32(n, 1024, TCA_GRED_LIMIT, limit);
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
return 0;
}
@ -264,6 +273,7 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
struct tc_gred_sopt *sopt;
struct tc_gred_qopt *qopt;
__u32 *max_p = NULL;
__u32 *limit = NULL;
unsigned i;
SPRINT_BUF(b1);
SPRINT_BUF(b2);
@ -281,6 +291,10 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
RTA_PAYLOAD(tb[TCA_GRED_MAX_P]) >= sizeof(__u32) * MAX_DPs)
max_p = RTA_DATA(tb[TCA_GRED_MAX_P]);
if (tb[TCA_GRED_LIMIT] &&
RTA_PAYLOAD(tb[TCA_GRED_LIMIT]) == sizeof(__u32))
limit = RTA_DATA(tb[TCA_GRED_LIMIT]);
sopt = RTA_DATA(tb[TCA_GRED_DPS]);
qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
if (RTA_PAYLOAD(tb[TCA_GRED_DPS]) < sizeof(*sopt) ||
@ -296,6 +310,10 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
sopt->def_DP,
sopt->grio ? "grio " : "");
if (limit)
fprintf(f, "limit %s ",
sprint_size(*limit, b1));
for (i=0;i<MAX_DPs;i++, qopt++) {
if (qopt->DP >= MAX_DPs) continue;
fprintf(f, "\n vq %u prio %hhu limit %s min %s max %s ",