diff options
| -rw-r--r-- | include/net/sch_generic.h | 2 | ||||
| -rw-r--r-- | net/sched/sch_generic.c | 106 |
2 files changed, 87 insertions, 21 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 9b9e4feda127..da2528036e2e 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -95,7 +95,7 @@ struct Qdisc { struct gnet_stats_queue qstats; unsigned long state; struct Qdisc *next_sched; - struct sk_buff *skb_bad_txq; + struct sk_buff_head skb_bad_txq; int padded; refcount_t refcnt; diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 482ba2234470..84cef0570862 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -45,6 +45,68 @@ EXPORT_SYMBOL(default_qdisc_ops); * - ingress filtering is also serialized via qdisc root lock * - updates to tree and tree walking are only done under the rtnl mutex. */ + +static inline struct sk_buff *__skb_dequeue_bad_txq(struct Qdisc *q) +{ + const struct netdev_queue *txq = q->dev_queue; + spinlock_t *lock = NULL; + struct sk_buff *skb; + + if (q->flags & TCQ_F_NOLOCK) { + lock = qdisc_lock(q); + spin_lock(lock); + } + + skb = skb_peek(&q->skb_bad_txq); + if (skb) { + /* check the reason of requeuing without tx lock first */ + txq = skb_get_tx_queue(txq->dev, skb); + if (!netif_xmit_frozen_or_stopped(txq)) { + skb = __skb_dequeue(&q->skb_bad_txq); + if (qdisc_is_percpu_stats(q)) { + qdisc_qstats_cpu_backlog_dec(q, skb); + qdisc_qstats_cpu_qlen_dec(q); + } else { + qdisc_qstats_backlog_dec(q, skb); + q->q.qlen--; + } + } else { + skb = NULL; + } + } + + if (lock) + spin_unlock(lock); + + return skb; +} + +static inline struct sk_buff *qdisc_dequeue_skb_bad_txq(struct Qdisc *q) +{ + struct sk_buff *skb = skb_peek(&q->skb_bad_txq); + + if (unlikely(skb)) + skb = __skb_dequeue_bad_txq(q); + + return skb; +} + +static inline void qdisc_enqueue_skb_bad_txq(struct Qdisc *q, + struct sk_buff *skb) +{ + spinlock_t *lock = NULL; + + if (q->flags & TCQ_F_NOLOCK) { + lock = qdisc_lock(q); + spin_lock(lock); + } + + __skb_queue_tail(&q->skb_bad_txq, skb); + + if (lock) + spin_unlock(lock); +} + static inline int __dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) { __skb_queue_head(&q->gso_skb, skb); @@ -117,9 +179,15 @@ static void try_bulk_dequeue_skb_slow(struct Qdisc *q, if (!nskb) break; if (unlikely(skb_get_queue_mapping(nskb) != mapping)) { - q->skb_bad_txq = nskb; - qdisc_qstats_backlog_inc(q, nskb); - q->q.qlen++; + qdisc_enqueue_skb_bad_txq(q, nskb); + + if (qdisc_is_percpu_stats(q)) { + qdisc_qstats_cpu_backlog_inc(q, nskb); + qdisc_qstats_cpu_qlen_inc(q); + } else { + qdisc_qstats_backlog_inc(q, nskb); + q->q.qlen++; + } break; } skb->next = nskb; @@ -180,19 +248,9 @@ static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate, } validate: *validate = true; - skb = q->skb_bad_txq; - if (unlikely(skb)) { - /* check the reason of requeuing without tx lock first */ - txq = skb_get_tx_queue(txq->dev, skb); - if (!netif_xmit_frozen_or_stopped(txq)) { - q->skb_bad_txq = NULL; - qdisc_qstats_backlog_dec(q, skb); - q->q.qlen--; - goto bulk; - } - skb = NULL; - goto trace; - } + skb = qdisc_dequeue_skb_bad_txq(q); + if (unlikely(skb)) + goto bulk; if (!(q->flags & TCQ_F_ONETXQUEUE) || !netif_xmit_frozen_or_stopped(txq)) skb = q->dequeue(q); @@ -680,6 +738,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, sch->padded = (char *) sch - (char *) p; } __skb_queue_head_init(&sch->gso_skb); + __skb_queue_head_init(&sch->skb_bad_txq); qdisc_skb_head_init(&sch->q); spin_lock_init(&sch->q.lock); @@ -753,14 +812,16 @@ void qdisc_reset(struct Qdisc *qdisc) if (ops->reset) ops->reset(qdisc); - kfree_skb(qdisc->skb_bad_txq); - qdisc->skb_bad_txq = NULL; - skb_queue_walk_safe(&qdisc->gso_skb, skb, tmp) { __skb_unlink(skb, &qdisc->gso_skb); kfree_skb_list(skb); } + skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) { + __skb_unlink(skb, &qdisc->skb_bad_txq); + kfree_skb_list(skb); + } + qdisc->q.qlen = 0; qdisc->qstats.backlog = 0; } @@ -804,7 +865,11 @@ void qdisc_destroy(struct Qdisc *qdisc) kfree_skb_list(skb); } - kfree_skb(qdisc->skb_bad_txq); + skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) { + __skb_unlink(skb, &qdisc->skb_bad_txq); + kfree_skb_list(skb); + } + qdisc_free(qdisc); } EXPORT_SYMBOL(qdisc_destroy); @@ -1042,6 +1107,7 @@ static void dev_init_scheduler_queue(struct net_device *dev, rcu_assign_pointer(dev_queue->qdisc, qdisc); dev_queue->qdisc_sleeping = qdisc; __skb_queue_head_init(&qdisc->gso_skb); + __skb_queue_head_init(&qdisc->skb_bad_txq); } void dev_init_scheduler(struct net_device *dev) |