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Diffstat (limited to 'net/sched/sch_red.c')
-rw-r--r--net/sched/sch_red.c31
1 files changed, 25 insertions, 6 deletions
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index d4ce111704dc..3ef0a4f7399b 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -48,7 +48,7 @@ struct red_sched_data {
struct Qdisc *qdisc;
};
-static const u32 red_supported_flags = TC_RED_HISTORIC_FLAGS;
+static const u32 red_supported_flags = TC_RED_HISTORIC_FLAGS | TC_RED_NODROP;
static inline int red_use_ecn(struct red_sched_data *q)
{
@@ -60,6 +60,11 @@ static inline int red_use_harddrop(struct red_sched_data *q)
return q->flags & TC_RED_HARDDROP;
}
+static int red_use_nodrop(struct red_sched_data *q)
+{
+ return q->flags & TC_RED_NODROP;
+}
+
static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff **to_free)
{
@@ -80,23 +85,36 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch,
case RED_PROB_MARK:
qdisc_qstats_overlimit(sch);
- if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
+ if (!red_use_ecn(q)) {
q->stats.prob_drop++;
goto congestion_drop;
}
- q->stats.prob_mark++;
+ if (INET_ECN_set_ce(skb)) {
+ q->stats.prob_mark++;
+ } else if (!red_use_nodrop(q)) {
+ q->stats.prob_drop++;
+ goto congestion_drop;
+ }
+
+ /* Non-ECT packet in ECN nodrop mode: queue it. */
break;
case RED_HARD_MARK:
qdisc_qstats_overlimit(sch);
- if (red_use_harddrop(q) || !red_use_ecn(q) ||
- !INET_ECN_set_ce(skb)) {
+ if (red_use_harddrop(q) || !red_use_ecn(q)) {
+ q->stats.forced_drop++;
+ goto congestion_drop;
+ }
+
+ if (INET_ECN_set_ce(skb)) {
+ q->stats.forced_mark++;
+ } else if (!red_use_nodrop(q)) {
q->stats.forced_drop++;
goto congestion_drop;
}
- q->stats.forced_mark++;
+ /* Non-ECT packet in ECN nodrop mode: queue it. */
break;
}
@@ -171,6 +189,7 @@ static int red_offload(struct Qdisc *sch, bool enable)
opt.set.limit = q->limit;
opt.set.is_ecn = red_use_ecn(q);
opt.set.is_harddrop = red_use_harddrop(q);
+ opt.set.is_nodrop = red_use_nodrop(q);
opt.set.qstats = &sch->qstats;
} else {
opt.command = TC_RED_DESTROY;