cbs: Add support for the graft function
This will allow to install a child qdisc under cbs. The main use case is to install ETF (Earliest TxTime First) qdisc under cbs, so there's another level of control for time-sensitive traffic. Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vinicius Costa Gomes
David S. Miller
parent
336a443bd9
commit
990e35ecba
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@ -78,18 +78,42 @@ struct cbs_sched_data {
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s64 sendslope; /* in bytes/s */
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s64 idleslope; /* in bytes/s */
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struct qdisc_watchdog watchdog;
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int (*enqueue)(struct sk_buff *skb, struct Qdisc *sch);
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int (*enqueue)(struct sk_buff *skb, struct Qdisc *sch,
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struct sk_buff **to_free);
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struct sk_buff *(*dequeue)(struct Qdisc *sch);
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struct Qdisc *qdisc;
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};
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static int cbs_enqueue_offload(struct sk_buff *skb, struct Qdisc *sch)
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static int cbs_child_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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struct Qdisc *child,
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struct sk_buff **to_free)
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{
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return qdisc_enqueue_tail(skb, sch);
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int err;
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err = child->ops->enqueue(skb, child, to_free);
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if (err != NET_XMIT_SUCCESS)
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return err;
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qdisc_qstats_backlog_inc(sch, skb);
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sch->q.qlen++;
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return NET_XMIT_SUCCESS;
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}
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static int cbs_enqueue_soft(struct sk_buff *skb, struct Qdisc *sch)
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static int cbs_enqueue_offload(struct sk_buff *skb, struct Qdisc *sch,
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struct sk_buff **to_free)
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{
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struct cbs_sched_data *q = qdisc_priv(sch);
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struct Qdisc *qdisc = q->qdisc;
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return cbs_child_enqueue(skb, sch, qdisc, to_free);
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}
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static int cbs_enqueue_soft(struct sk_buff *skb, struct Qdisc *sch,
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struct sk_buff **to_free)
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{
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struct cbs_sched_data *q = qdisc_priv(sch);
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struct Qdisc *qdisc = q->qdisc;
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if (sch->q.qlen == 0 && q->credits > 0) {
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/* We need to stop accumulating credits when there's
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@ -99,7 +123,7 @@ static int cbs_enqueue_soft(struct sk_buff *skb, struct Qdisc *sch)
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q->last = ktime_get_ns();
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}
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return qdisc_enqueue_tail(skb, sch);
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return cbs_child_enqueue(skb, sch, qdisc, to_free);
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}
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static int cbs_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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@ -107,7 +131,7 @@ static int cbs_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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{
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struct cbs_sched_data *q = qdisc_priv(sch);
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return q->enqueue(skb, sch);
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return q->enqueue(skb, sch, to_free);
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}
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/* timediff is in ns, slope is in bytes/s */
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@ -132,9 +156,25 @@ static s64 credits_from_len(unsigned int len, s64 slope, s64 port_rate)
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return div64_s64(len * slope, port_rate);
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}
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static struct sk_buff *cbs_child_dequeue(struct Qdisc *sch, struct Qdisc *child)
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{
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struct sk_buff *skb;
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skb = child->ops->dequeue(child);
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if (!skb)
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return NULL;
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qdisc_qstats_backlog_dec(sch, skb);
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qdisc_bstats_update(sch, skb);
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sch->q.qlen--;
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return skb;
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}
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static struct sk_buff *cbs_dequeue_soft(struct Qdisc *sch)
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{
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struct cbs_sched_data *q = qdisc_priv(sch);
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struct Qdisc *qdisc = q->qdisc;
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s64 now = ktime_get_ns();
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struct sk_buff *skb;
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s64 credits;
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@ -157,8 +197,7 @@ static struct sk_buff *cbs_dequeue_soft(struct Qdisc *sch)
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return NULL;
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}
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}
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skb = qdisc_dequeue_head(sch);
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skb = cbs_child_dequeue(sch, qdisc);
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if (!skb)
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return NULL;
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@ -178,7 +217,10 @@ static struct sk_buff *cbs_dequeue_soft(struct Qdisc *sch)
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static struct sk_buff *cbs_dequeue_offload(struct Qdisc *sch)
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{
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return qdisc_dequeue_head(sch);
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struct cbs_sched_data *q = qdisc_priv(sch);
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struct Qdisc *qdisc = q->qdisc;
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return cbs_child_dequeue(sch, qdisc);
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}
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static struct sk_buff *cbs_dequeue(struct Qdisc *sch)
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@ -310,6 +352,13 @@ static int cbs_init(struct Qdisc *sch, struct nlattr *opt,
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return -EINVAL;
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}
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q->qdisc = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
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sch->handle, extack);
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if (!q->qdisc)
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return -ENOMEM;
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qdisc_hash_add(q->qdisc, false);
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q->queue = sch->dev_queue - netdev_get_tx_queue(dev, 0);
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q->enqueue = cbs_enqueue_soft;
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@ -328,6 +377,9 @@ static void cbs_destroy(struct Qdisc *sch)
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qdisc_watchdog_cancel(&q->watchdog);
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cbs_disable_offload(dev, q);
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if (q->qdisc)
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qdisc_destroy(q->qdisc);
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}
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static int cbs_dump(struct Qdisc *sch, struct sk_buff *skb)
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@ -356,8 +408,72 @@ nla_put_failure:
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return -1;
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}
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static int cbs_dump_class(struct Qdisc *sch, unsigned long cl,
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struct sk_buff *skb, struct tcmsg *tcm)
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{
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struct cbs_sched_data *q = qdisc_priv(sch);
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if (cl != 1 || !q->qdisc) /* only one class */
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return -ENOENT;
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tcm->tcm_handle |= TC_H_MIN(1);
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tcm->tcm_info = q->qdisc->handle;
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return 0;
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}
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static int cbs_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
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struct Qdisc **old, struct netlink_ext_ack *extack)
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{
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struct cbs_sched_data *q = qdisc_priv(sch);
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if (!new) {
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new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
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sch->handle, NULL);
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if (!new)
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new = &noop_qdisc;
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}
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*old = qdisc_replace(sch, new, &q->qdisc);
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return 0;
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}
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static struct Qdisc *cbs_leaf(struct Qdisc *sch, unsigned long arg)
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{
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struct cbs_sched_data *q = qdisc_priv(sch);
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return q->qdisc;
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}
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static unsigned long cbs_find(struct Qdisc *sch, u32 classid)
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{
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return 1;
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}
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static void cbs_walk(struct Qdisc *sch, struct qdisc_walker *walker)
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{
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if (!walker->stop) {
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if (walker->count >= walker->skip) {
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if (walker->fn(sch, 1, walker) < 0) {
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walker->stop = 1;
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return;
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}
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}
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walker->count++;
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}
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}
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static const struct Qdisc_class_ops cbs_class_ops = {
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.graft = cbs_graft,
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.leaf = cbs_leaf,
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.find = cbs_find,
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.walk = cbs_walk,
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.dump = cbs_dump_class,
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};
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static struct Qdisc_ops cbs_qdisc_ops __read_mostly = {
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.id = "cbs",
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.cl_ops = &cbs_class_ops,
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.priv_size = sizeof(struct cbs_sched_data),
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.enqueue = cbs_enqueue,
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.dequeue = cbs_dequeue,
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