@@ -17,7 +17,11 @@ packets
rate
.B ] [ probability
chance
-.B ] [ adaptive ]
+.B ] [ adaptive ] [ qevent early block
+index
+.B ] [ qevent mark block
+index
+.B ]
.SH DESCRIPTION
Random Early Detection is a classless qdisc which manages its queue size
@@ -134,6 +138,18 @@ Goal of Adaptive RED is to make 'probability' dynamic value between 1% and 50% t
.B (max - min) / 2
.fi
+.SH QEVENTS
+See tc (8) for some general notes about qevents. The RED qdisc supports the
+following qevents:
+
+.TP
+early
+The associated block is executed when packets are early-dropped. This includes
+non-ECT packets in ECN mode.
+.TP
+mark
+The associated block is executed when packets are marked in ECN mode.
+
.SH EXAMPLE
.P
@@ -22,6 +22,7 @@
#include "utils.h"
#include "tc_util.h"
+#include "tc_qevent.h"
#include "tc_red.h"
@@ -30,7 +31,8 @@ static void explain(void)
fprintf(stderr,
"Usage: ... red limit BYTES [min BYTES] [max BYTES] avpkt BYTES [burst PACKETS]\n"
" [adaptive] [probability PROBABILITY] [bandwidth KBPS]\n"
- " [ecn] [harddrop] [nodrop]\n");
+ " [ecn] [harddrop] [nodrop]\n"
+ " [qevent early block IDX] [qevent mark block IDX]\n");
}
#define RED_SUPPORTED_FLAGS (TC_RED_HISTORIC_FLAGS | TC_RED_NODROP)
@@ -38,6 +40,14 @@ static void explain(void)
static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv,
struct nlmsghdr *n, const char *dev)
{
+ struct qevent_plain qe_early = {};
+ struct qevent_plain qe_mark = {};
+ struct qevent_util qevents[] = {
+ QEVENT("early", plain, &qe_early),
+ QEVENT("mark", plain, &qe_mark),
+ {},
+ };
+
struct nla_bitfield32 flags_bf = {
.selector = RED_SUPPORTED_FLAGS,
};
@@ -109,6 +119,11 @@ static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv,
flags_bf.value |= TC_RED_ADAPTATIVE;
} else if (strcmp(*argv, "adaptive") == 0) {
flags_bf.value |= TC_RED_ADAPTATIVE;
+ } else if (matches(*argv, "qevent") == 0) {
+ NEXT_ARG();
+ if (qevent_parse(qevents, &argc, &argv))
+ return -1;
+ continue;
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
@@ -162,6 +177,12 @@ static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv,
max_P = probability * pow(2, 32);
addattr_l(n, 1024, TCA_RED_MAX_P, &max_P, sizeof(max_P));
addattr_l(n, 1024, TCA_RED_FLAGS, &flags_bf, sizeof(flags_bf));
+ if (qe_early.base.block_idx)
+ addattr32(n, 1024, TCA_RED_EARLY_BLOCK,
+ qe_early.base.block_idx);
+ if (qe_mark.base.block_idx)
+ addattr32(n, 1024, TCA_RED_MARK_BLOCK,
+ qe_mark.base.block_idx);
addattr_nest_end(n, tail);
return 0;
}
The "early" qevent matches packets that have been early-dropped. The "mark" qevent matches packets that have been ECN-marked. Signed-off-by: Petr Machata <petrm@mellanox.com> --- man/man8/tc-red.8 | 18 +++++++++++++++++- tc/q_red.c | 23 ++++++++++++++++++++++- 2 files changed, 39 insertions(+), 2 deletions(-)