net_sched: sfb: optimize enqueue on full queue
In case SFB queue is full (hard limit reached), there is no point
spending time to compute hash and maximum qlen/p_mark.
We instead just early drop packet.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index 0a833d0..e83c272 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -287,6 +287,12 @@
u32 r, slot, salt, sfbhash;
int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
+ if (unlikely(sch->q.qlen >= q->limit)) {
+ sch->qstats.overlimits++;
+ q->stats.queuedrop++;
+ goto drop;
+ }
+
if (q->rehash_interval > 0) {
unsigned long limit = q->rehash_time + q->rehash_interval;
@@ -332,12 +338,9 @@
slot ^= 1;
sfb_skb_cb(skb)->hashes[slot] = 0;
- if (unlikely(minqlen >= q->max || sch->q.qlen >= q->limit)) {
+ if (unlikely(minqlen >= q->max)) {
sch->qstats.overlimits++;
- if (minqlen >= q->max)
- q->stats.bucketdrop++;
- else
- q->stats.queuedrop++;
+ q->stats.bucketdrop++;
goto drop;
}