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authorThomas Graf2005-11-05 21:14:27 +0100
committerThomas Graf2005-11-05 22:02:29 +0100
commitb38c7eef7e536d12051cc3d5864032f2f907cdfe (patch)
treefcf0b38267b9f5cb77f98ffdbc3dc16b31a0908a
parentd8f64e19605d6ce40bc560e7bc919e2e02a79c1b (diff)
[PKT_SCHED]: GRED: Support ECN marking
Adds a new u8 flags in a unused padding area of the netlink message. Adds ECN marking support to be used instead of dropping packets immediately. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
-rw-r--r--include/linux/pkt_sched.h4
-rw-r--r--net/sched/sch_gred.c25
2 files changed, 23 insertions, 6 deletions
diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index d053add3dca7..0ebe320223e2 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -220,8 +220,8 @@ struct tc_gred_sopt
__u32 DPs;
__u32 def_DP;
__u8 grio;
- __u8 pad1;
- __u16 pad2;
+ __u8 flags;
+ __u16 pad1;
};
/* HTB section */
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index 69f0fd45d4c3..079b0a4ea1c2 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -55,6 +55,7 @@ struct gred_sched
{
struct gred_sched_data *tab[MAX_DPs];
unsigned long flags;
+ u32 red_flags;
u32 DPs;
u32 def;
struct red_parms wred_set;
@@ -140,6 +141,11 @@ static inline void gred_store_wred_set(struct gred_sched *table,
table->wred_set.qavg = q->parms.qavg;
}
+static inline int gred_use_ecn(struct gred_sched *t)
+{
+ return t->red_flags & TC_RED_ECN;
+}
+
static int gred_enqueue(struct sk_buff *skb, struct Qdisc* sch)
{
struct gred_sched_data *q=NULL;
@@ -198,13 +204,22 @@ static int gred_enqueue(struct sk_buff *skb, struct Qdisc* sch)
case RED_PROB_MARK:
sch->qstats.overlimits++;
- q->stats.prob_drop++;
- goto congestion_drop;
+ if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) {
+ q->stats.prob_drop++;
+ goto congestion_drop;
+ }
+
+ q->stats.prob_mark++;
+ break;
case RED_HARD_MARK:
sch->qstats.overlimits++;
- q->stats.forced_drop++;
- goto congestion_drop;
+ if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) {
+ q->stats.forced_drop++;
+ goto congestion_drop;
+ }
+ q->stats.forced_mark++;
+ break;
}
if (q->backlog + skb->len <= q->limit) {
@@ -348,6 +363,7 @@ static inline int gred_change_table_def(struct Qdisc *sch, struct rtattr *dps)
sch_tree_lock(sch);
table->DPs = sopt->DPs;
table->def = sopt->def_DP;
+ table->red_flags = sopt->flags;
/*
* Every entry point to GRED is synchronized with the above code
@@ -489,6 +505,7 @@ static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
.DPs = table->DPs,
.def_DP = table->def,
.grio = gred_rio_mode(table),
+ .flags = table->red_flags,
};
opts = RTA_NEST(skb, TCA_OPTIONS);