Exemplo n.º 1
0
static void pfifo_fast_reset(struct Qdisc *qdisc)
{
	int i, band;
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);

	for (band = 0; band < PFIFO_FAST_BANDS; band++) {
		struct skb_array *q = band2list(priv, band);
		struct sk_buff *skb;

		/* NULL ring is possible if destroy path is due to a failed
		 * skb_array_init() in pfifo_fast_init() case.
		 */
		if (!q->ring.queue)
			continue;

		while ((skb = skb_array_consume_bh(q)) != NULL)
			kfree_skb(skb);
	}

	for_each_possible_cpu(i) {
		struct gnet_stats_queue *q = per_cpu_ptr(qdisc->cpu_qstats, i);

		q->backlog = 0;
		q->qlen = 0;
	}
}
Exemplo n.º 2
0
static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt)
{
	int prio;
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);

	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
		__skb_queue_head_init(band2list(priv, prio));

	/* Can by-pass the queue discipline */
	qdisc->flags |= TCQ_F_CAN_BYPASS;
	return 0;
}
Exemplo n.º 3
0
static void pfifo_fast_reset(struct Qdisc *qdisc)
{
	int prio;
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);

	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
		__qdisc_reset_queue(qdisc, band2list(priv, prio));

	priv->bitmap = 0;
	qdisc->qstats.backlog = 0;
	qdisc->q.qlen = 0;
}
Exemplo n.º 4
0
static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc)
{
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
	int band = bitmap2band[priv->bitmap];

	if (band >= 0) {
		struct sk_buff_head *list = band2list(priv, band);

		return skb_peek(list);
	}

	return NULL;
}
Exemplo n.º 5
0
static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc)
{
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
	struct sk_buff *skb = NULL;
	int band;

	for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) {
		struct skb_array *q = band2list(priv, band);

		skb = __skb_array_peek(q);
	}

	return skb;
}
Exemplo n.º 6
0
static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc)
{
	if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) {
		int band = prio2band[skb->priority & TC_PRIO_MAX];
		struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
		struct sk_buff_head *list = band2list(priv, band);

		priv->bitmap |= (1 << band);
		qdisc->q.qlen++;
		return __qdisc_enqueue_tail(skb, qdisc, list);
	}

	return qdisc_drop(skb, qdisc);
}
Exemplo n.º 7
0
static int pfifo_fast_change_tx_queue_len(struct Qdisc *sch,
					  unsigned int new_len)
{
	struct pfifo_fast_priv *priv = qdisc_priv(sch);
	struct skb_array *bands[PFIFO_FAST_BANDS];
	int prio;

	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
		struct skb_array *q = band2list(priv, prio);

		bands[prio] = q;
	}

	return skb_array_resize_multiple(bands, PFIFO_FAST_BANDS, new_len,
					 GFP_KERNEL);
}
Exemplo n.º 8
0
static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc,
			      struct sk_buff **to_free)
{
	int band = prio2band[skb->priority & TC_PRIO_MAX];
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
	struct skb_array *q = band2list(priv, band);
	int err;

	err = skb_array_produce(q, skb);

	if (unlikely(err))
		return qdisc_drop_cpu(skb, qdisc, to_free);

	qdisc_qstats_cpu_qlen_inc(qdisc);
	qdisc_qstats_cpu_backlog_inc(qdisc, skb);
	return NET_XMIT_SUCCESS;
}
Exemplo n.º 9
0
static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc)
{
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
	int band = bitmap2band[priv->bitmap];

	if (likely(band >= 0)) {
		struct sk_buff_head *list = band2list(priv, band);
		struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list);

		qdisc->q.qlen--;
		if (skb_queue_empty(list))
			priv->bitmap &= ~(1 << band);

		return skb;
	}

	return NULL;
}
Exemplo n.º 10
0
static void pfifo_fast_destroy(struct Qdisc *sch)
{
	struct pfifo_fast_priv *priv = qdisc_priv(sch);
	int prio;

	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
		struct skb_array *q = band2list(priv, prio);

		/* NULL ring is possible if destroy path is due to a failed
		 * skb_array_init() in pfifo_fast_init() case.
		 */
		if (!q->ring.queue)
			continue;
		/* Destroy ring but no need to kfree_skb because a call to
		 * pfifo_fast_reset() has already done that work.
		 */
		ptr_ring_cleanup(&q->ring, NULL);
	}
}
Exemplo n.º 11
0
static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc,
			      struct sk_buff **to_free)
{
	int band = prio2band[skb->priority & TC_PRIO_MAX];
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
	struct skb_array *q = band2list(priv, band);
	unsigned int pkt_len = qdisc_pkt_len(skb);
	int err;

	err = skb_array_produce(q, skb);

	if (unlikely(err))
		return qdisc_drop_cpu(skb, qdisc, to_free);

	qdisc_qstats_cpu_qlen_inc(qdisc);
	/* Note: skb can not be used after skb_array_produce(),
	 * so we better not use qdisc_qstats_cpu_backlog_inc()
	 */
	this_cpu_add(qdisc->cpu_qstats->backlog, pkt_len);
	return NET_XMIT_SUCCESS;
}
Exemplo n.º 12
0
static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc)
{
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
	struct sk_buff *skb = NULL;
	int band;

	for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) {
		struct skb_array *q = band2list(priv, band);

		if (__skb_array_empty(q))
			continue;

		skb = skb_array_consume_bh(q);
	}
	if (likely(skb)) {
		qdisc_qstats_cpu_backlog_dec(qdisc, skb);
		qdisc_bstats_cpu_update(qdisc, skb);
		qdisc_qstats_cpu_qlen_dec(qdisc);
	}

	return skb;
}
Exemplo n.º 13
0
static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt,
			   struct netlink_ext_ack *extack)
{
	unsigned int qlen = qdisc_dev(qdisc)->tx_queue_len;
	struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
	int prio;

	/* guard against zero length rings */
	if (!qlen)
		return -EINVAL;

	for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
		struct skb_array *q = band2list(priv, prio);
		int err;

		err = skb_array_init(q, qlen, GFP_KERNEL);
		if (err)
			return -ENOMEM;
	}

	/* Can by-pass the queue discipline */
	qdisc->flags |= TCQ_F_CAN_BYPASS;
	return 0;
}