aboutsummaryrefslogtreecommitdiffstats
path: root/include/net/sch_generic.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/net/sch_generic.h')
-rw-r--r--include/net/sch_generic.h100
1 files changed, 72 insertions, 28 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index a2b38b3deeca..21f434f3ac9e 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -52,10 +52,7 @@ struct qdisc_size_table {
struct qdisc_skb_head {
struct sk_buff *head;
struct sk_buff *tail;
- union {
- u32 qlen;
- atomic_t atomic_qlen;
- };
+ __u32 qlen;
spinlock_t lock;
};
@@ -113,6 +110,9 @@ struct Qdisc {
spinlock_t busylock ____cacheline_aligned_in_smp;
spinlock_t seqlock;
+
+ /* for NOLOCK qdisc, true if there are no enqueued skbs */
+ bool empty;
struct rcu_head rcu;
};
@@ -143,11 +143,24 @@ static inline bool qdisc_is_running(struct Qdisc *qdisc)
return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
}
+static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
+{
+ return q->flags & TCQ_F_CPUSTATS;
+}
+
+static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
+{
+ if (qdisc_is_percpu_stats(qdisc))
+ return qdisc->empty;
+ return !qdisc->q.qlen;
+}
+
static inline bool qdisc_run_begin(struct Qdisc *qdisc)
{
if (qdisc->flags & TCQ_F_NOLOCK) {
if (!spin_trylock(&qdisc->seqlock))
return false;
+ qdisc->empty = false;
} else if (qdisc_is_running(qdisc)) {
return false;
}
@@ -351,13 +364,10 @@ struct tcf_proto {
};
struct qdisc_skb_cb {
- union {
- struct {
- unsigned int pkt_len;
- u16 slave_dev_queue_mapping;
- u16 tc_classid;
- };
- struct bpf_flow_keys *flow_keys;
+ struct {
+ unsigned int pkt_len;
+ u16 slave_dev_queue_mapping;
+ u16 tc_classid;
};
#define QDISC_CB_PRIV_LEN 20
unsigned char data[QDISC_CB_PRIV_LEN];
@@ -470,19 +480,27 @@ static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
BUILD_BUG_ON(sizeof(qcb->data) < sz);
}
+static inline int qdisc_qlen_cpu(const struct Qdisc *q)
+{
+ return this_cpu_ptr(q->cpu_qstats)->qlen;
+}
+
static inline int qdisc_qlen(const struct Qdisc *q)
{
return q->q.qlen;
}
-static inline u32 qdisc_qlen_sum(const struct Qdisc *q)
+static inline int qdisc_qlen_sum(const struct Qdisc *q)
{
- u32 qlen = q->qstats.qlen;
+ __u32 qlen = q->qstats.qlen;
+ int i;
- if (q->flags & TCQ_F_NOLOCK)
- qlen += atomic_read(&q->q.atomic_qlen);
- else
+ if (qdisc_is_percpu_stats(q)) {
+ for_each_possible_cpu(i)
+ qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
+ } else {
qlen += q->q.qlen;
+ }
return qlen;
}
@@ -736,7 +754,7 @@ static inline bool qdisc_all_tx_empty(const struct net_device *dev)
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
const struct Qdisc *q = rcu_dereference(txq->qdisc);
- if (q->q.qlen) {
+ if (!qdisc_is_empty(q)) {
rcu_read_unlock();
return false;
}
@@ -806,11 +824,6 @@ static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
return sch->enqueue(skb, sch, to_free);
}
-static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
-{
- return q->flags & TCQ_F_CPUSTATS;
-}
-
static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
__u64 bytes, __u32 packets)
{
@@ -878,14 +891,14 @@ static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
}
-static inline void qdisc_qstats_atomic_qlen_inc(struct Qdisc *sch)
+static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
{
- atomic_inc(&sch->q.atomic_qlen);
+ this_cpu_inc(sch->cpu_qstats->qlen);
}
-static inline void qdisc_qstats_atomic_qlen_dec(struct Qdisc *sch)
+static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
{
- atomic_dec(&sch->q.atomic_qlen);
+ this_cpu_dec(sch->cpu_qstats->qlen);
}
static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
@@ -1095,6 +1108,32 @@ static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
return skb;
}
+static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
+ struct sk_buff *skb)
+{
+ if (qdisc_is_percpu_stats(sch)) {
+ qdisc_qstats_cpu_backlog_dec(sch, skb);
+ qdisc_bstats_cpu_update(sch, skb);
+ qdisc_qstats_cpu_qlen_dec(sch);
+ } else {
+ qdisc_qstats_backlog_dec(sch, skb);
+ qdisc_bstats_update(sch, skb);
+ sch->q.qlen--;
+ }
+}
+
+static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
+ unsigned int pkt_len)
+{
+ if (qdisc_is_percpu_stats(sch)) {
+ qdisc_qstats_cpu_qlen_inc(sch);
+ this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
+ } else {
+ sch->qstats.backlog += pkt_len;
+ sch->q.qlen++;
+ }
+}
+
/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
{
@@ -1102,8 +1141,13 @@ static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
if (skb) {
skb = __skb_dequeue(&sch->gso_skb);
- qdisc_qstats_backlog_dec(sch, skb);
- sch->q.qlen--;
+ if (qdisc_is_percpu_stats(sch)) {
+ qdisc_qstats_cpu_backlog_dec(sch, skb);
+ qdisc_qstats_cpu_qlen_dec(sch);
+ } else {
+ qdisc_qstats_backlog_dec(sch, skb);
+ sch->q.qlen--;
+ }
} else {
skb = sch->dequeue(sch);
}