static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{

	struct sfb_sched_data *q = qdisc_priv(sch);
	struct Qdisc *child = q->qdisc;
	int i;
	u32 p_min = ~0;
	u32 minqlen = ~0;
	u32 r, slot, salt, sfbhash;
	int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
	struct flow_keys keys;

	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;

		if (unlikely(time_after(jiffies, limit))) {
			sfb_swap_slot(q);
			q->rehash_time = jiffies;
		} else if (unlikely(!q->double_buffering && q->warmup_time > 0 &&
				    time_after(jiffies, limit - q->warmup_time))) {
			q->double_buffering = true;
		}
	}

	if (q->filter_list) {
		/* If using external classifiers, get result and record it. */
		if (!sfb_classify(skb, q, &ret, &salt))
			goto other_drop;
		keys.src = salt;
		keys.dst = 0;
		keys.ports = 0;
	} else {
		skb_flow_dissect(skb, &keys);
	}

	slot = q->slot;

	sfbhash = jhash_3words((__force u32)keys.dst,
			       (__force u32)keys.src,
			       (__force u32)keys.ports,
			       q->bins[slot].perturbation);
	if (!sfbhash)
		sfbhash = 1;
	sfb_skb_cb(skb)->hashes[slot] = sfbhash;

	for (i = 0; i < SFB_LEVELS; i++) {
		u32 hash = sfbhash & SFB_BUCKET_MASK;
		struct sfb_bucket *b = &q->bins[slot].bins[i][hash];

		sfbhash >>= SFB_BUCKET_SHIFT;
		if (b->qlen == 0)
			decrement_prob(b, q);
		else if (b->qlen >= q->bin_size)
			increment_prob(b, q);
		if (minqlen > b->qlen)
			minqlen = b->qlen;
		if (p_min > b->p_mark)
			p_min = b->p_mark;
	}

	slot ^= 1;
	sfb_skb_cb(skb)->hashes[slot] = 0;

	if (unlikely(minqlen >= q->max)) {
		sch->qstats.overlimits++;
		q->stats.bucketdrop++;
		goto drop;
	}

	if (unlikely(p_min >= SFB_MAX_PROB)) {
		/* Inelastic flow */
		if (q->double_buffering) {
			sfbhash = jhash_3words((__force u32)keys.dst,
					       (__force u32)keys.src,
					       (__force u32)keys.ports,
					       q->bins[slot].perturbation);
			if (!sfbhash)
				sfbhash = 1;
			sfb_skb_cb(skb)->hashes[slot] = sfbhash;

			for (i = 0; i < SFB_LEVELS; i++) {
				u32 hash = sfbhash & SFB_BUCKET_MASK;
				struct sfb_bucket *b = &q->bins[slot].bins[i][hash];

				sfbhash >>= SFB_BUCKET_SHIFT;
				if (b->qlen == 0)
					decrement_prob(b, q);
				else if (b->qlen >= q->bin_size)
					increment_prob(b, q);
			}
		}
		if (sfb_rate_limit(skb, q)) {
			sch->qstats.overlimits++;
			q->stats.penaltydrop++;
			goto drop;
		}
		goto enqueue;
	}
Beispiel #2
0
static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
		       struct sk_buff **to_free)
{

	struct sfb_sched_data *q = qdisc_priv(sch);
	struct Qdisc *child = q->qdisc;
	struct tcf_proto *fl;
	int i;
	u32 p_min = ~0;
	u32 minqlen = ~0;
	u32 r, sfbhash;
	u32 slot = q->slot;
	int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;

	if (unlikely(sch->q.qlen >= q->limit)) {
		qdisc_qstats_overlimit(sch);
		q->stats.queuedrop++;
		goto drop;
	}

	if (q->rehash_interval > 0) {
		unsigned long limit = q->rehash_time + q->rehash_interval;

		if (unlikely(time_after(jiffies, limit))) {
			sfb_swap_slot(q);
			q->rehash_time = jiffies;
		} else if (unlikely(!q->double_buffering && q->warmup_time > 0 &&
				    time_after(jiffies, limit - q->warmup_time))) {
			q->double_buffering = true;
		}
	}

	fl = rcu_dereference_bh(q->filter_list);
	if (fl) {
		u32 salt;

		/* If using external classifiers, get result and record it. */
		if (!sfb_classify(skb, fl, &ret, &salt))
			goto other_drop;
		sfbhash = jhash_1word(salt, q->bins[slot].perturbation);
	} else {
		sfbhash = skb_get_hash_perturb(skb, q->bins[slot].perturbation);
	}


	if (!sfbhash)
		sfbhash = 1;
	sfb_skb_cb(skb)->hashes[slot] = sfbhash;

	for (i = 0; i < SFB_LEVELS; i++) {
		u32 hash = sfbhash & SFB_BUCKET_MASK;
		struct sfb_bucket *b = &q->bins[slot].bins[i][hash];

		sfbhash >>= SFB_BUCKET_SHIFT;
		if (b->qlen == 0)
			decrement_prob(b, q);
		else if (b->qlen >= q->bin_size)
			increment_prob(b, q);
		if (minqlen > b->qlen)
			minqlen = b->qlen;
		if (p_min > b->p_mark)
			p_min = b->p_mark;
	}

	slot ^= 1;
	sfb_skb_cb(skb)->hashes[slot] = 0;

	if (unlikely(minqlen >= q->max)) {
		qdisc_qstats_overlimit(sch);
		q->stats.bucketdrop++;
		goto drop;
	}

	if (unlikely(p_min >= SFB_MAX_PROB)) {
		/* Inelastic flow */
		if (q->double_buffering) {
			sfbhash = skb_get_hash_perturb(skb,
			    q->bins[slot].perturbation);
			if (!sfbhash)
				sfbhash = 1;
			sfb_skb_cb(skb)->hashes[slot] = sfbhash;

			for (i = 0; i < SFB_LEVELS; i++) {
				u32 hash = sfbhash & SFB_BUCKET_MASK;
				struct sfb_bucket *b = &q->bins[slot].bins[i][hash];

				sfbhash >>= SFB_BUCKET_SHIFT;
				if (b->qlen == 0)
					decrement_prob(b, q);
				else if (b->qlen >= q->bin_size)
					increment_prob(b, q);
			}
		}
		if (sfb_rate_limit(skb, q)) {
			qdisc_qstats_overlimit(sch);
			q->stats.penaltydrop++;
			goto drop;
		}
		goto enqueue;
	}