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tc: gred: allow controlling and dumping per-DP RED flags

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Kernel now support setting ECN and HARDDROP flags per-virtual
queue.  Allow users to tweak the settings, and print them on
dump.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Jakub Kicinski 2018-11-19 15:03:35 -08:00 committed by David Ahern
parent 2d7c564a1e
commit f7a8749aff
1 changed files with 25 additions and 3 deletions
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28
tc/q_gred.c
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@ -40,7 +40,7 @@ static void explain(void)
fprintf(stderr, " default DEFAULT_VQ [ grio ] [ limit BYTES ] [ecn] [harddrop]\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");
fprintf(stderr, " [ probability PROBABILITY ] [ bandwidth KBPS ] [ecn] [harddrop]\n");
}
static int init_gred(struct qdisc_util *qu, int argc, char **argv,
@ -121,15 +121,16 @@ static int init_gred(struct qdisc_util *qu, int argc, char **argv,
*/
static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
{
struct rtattr *tail, *entry, *vqs;
int ok = 0;
struct tc_gred_qopt opt = { 0 };
unsigned int burst = 0;
unsigned int avpkt = 0;
unsigned int flags = 0;
double probability = 0.02;
unsigned int rate = 0;
int parm;
__u8 sbuf[256];
struct rtattr *tail;
__u32 max_P;
opt.DP = MAX_DPs;
@ -212,6 +213,10 @@ static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct n
return -1;
}
ok++;
} else if (strcmp(*argv, "ecn") == 0) {
flags |= TC_RED_ECN;
} else if (strcmp(*argv, "harddrop") == 0) {
flags |= TC_RED_HARDDROP;
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
@ -265,11 +270,20 @@ static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct n
addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
max_P = probability * pow(2, 32);
addattr32(n, 1024, TCA_GRED_MAX_P, max_P);
vqs = addattr_nest(n, 1024, TCA_GRED_VQ_LIST);
entry = addattr_nest(n, 1024, TCA_GRED_VQ_ENTRY);
addattr32(n, 1024, TCA_GRED_VQ_DP, opt.DP);
addattr32(n, 1024, TCA_GRED_VQ_FLAGS, flags);
addattr_nest_end(n, entry);
addattr_nest_end(n, vqs);
addattr_nest_end(n, tail);
return 0;
}
struct tc_gred_info {
bool flags_present;
__u64 bytes;
__u32 packets;
__u32 backlog;
@ -279,6 +293,7 @@ struct tc_gred_info {
__u32 forced_mark;
__u32 pdrop;
__u32 other;
__u32 flags;
};
static void
@ -345,6 +360,10 @@ gred_parse_vqs(struct tc_gred_info *info, struct rtattr *vqs)
if (tb[TCA_GRED_VQ_STAT_OTHER])
info[dp].other =
rta_getattr_u32(tb[TCA_GRED_VQ_STAT_OTHER]);
info[dp].flags_present = !!tb[TCA_GRED_VQ_FLAGS];
if (tb[TCA_GRED_VQ_FLAGS])
info[dp].flags =
rta_getattr_u32(tb[TCA_GRED_VQ_FLAGS]);
}
}
@ -437,7 +456,7 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
return -1;
}
if (tb[TCA_GRED_VQ_LIST] && show_stats) {
if (tb[TCA_GRED_VQ_LIST]) {
gred_parse_vqs(infos, tb[TCA_GRED_VQ_LIST]);
vq_info = true;
}
@ -480,6 +499,9 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
print_string(PRINT_FP, NULL, "max %s ",
sprint_size(qopt->qth_max, b1));
if (infos[i].flags_present)
tc_red_print_flags(infos[i].flags);
if (show_details) {
print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
if (max_p)