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-rw-r--r--include/net/sch_generic.h122
1 files changed, 103 insertions, 19 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index a3cfb8ebeb5..d17ed6fb2f7 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -6,6 +6,8 @@
#include <linux/rcupdate.h>
#include <linux/pkt_sched.h>
#include <linux/pkt_cls.h>
+#include <linux/percpu.h>
+#include <linux/dynamic_queue_limits.h>
#include <net/gen_stats.h>
#include <net/rtnetlink.h>
@@ -58,6 +60,7 @@ struct Qdisc {
* multiqueue device.
*/
#define TCQ_F_WARN_NONWC (1 << 16)
+#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
u32 limit;
const struct Qdisc_ops *ops;
struct qdisc_size_table __rcu *stab;
@@ -83,9 +86,15 @@ struct Qdisc {
*/
unsigned long state;
struct sk_buff_head q;
- struct gnet_stats_basic_packed bstats;
+ union {
+ struct gnet_stats_basic_packed bstats;
+ struct gnet_stats_basic_cpu __percpu *cpu_bstats;
+ } __packed;
unsigned int __state;
- struct gnet_stats_queue qstats;
+ union {
+ struct gnet_stats_queue qstats;
+ struct gnet_stats_queue __percpu *cpu_qstats;
+ } __packed;
struct rcu_head rcu_head;
int padded;
atomic_t refcnt;
@@ -111,6 +120,21 @@ static inline void qdisc_run_end(struct Qdisc *qdisc)
qdisc->__state &= ~__QDISC___STATE_RUNNING;
}
+static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
+{
+ return qdisc->flags & TCQ_F_ONETXQUEUE;
+}
+
+static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
+{
+#ifdef CONFIG_BQL
+ /* Non-BQL migrated drivers will return 0, too. */
+ return dql_avail(&txq->dql);
+#else
+ return 0;
+#endif
+}
+
static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
{
return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
@@ -143,7 +167,7 @@ struct Qdisc_class_ops {
void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
/* Filter manipulation */
- struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
+ struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
u32 classid);
void (*unbind_tcf)(struct Qdisc *, unsigned long);
@@ -212,8 +236,8 @@ struct tcf_proto_ops {
struct tcf_proto {
/* Fast access part */
- struct tcf_proto *next;
- void *root;
+ struct tcf_proto __rcu *next;
+ void __rcu *root;
int (*classify)(struct sk_buff *,
const struct tcf_proto *,
struct tcf_result *);
@@ -225,13 +249,15 @@ struct tcf_proto {
struct Qdisc *q;
void *data;
const struct tcf_proto_ops *ops;
+ struct rcu_head rcu;
};
struct qdisc_skb_cb {
unsigned int pkt_len;
u16 slave_dev_queue_mapping;
u16 _pad;
- unsigned char data[24];
+#define QDISC_CB_PRIV_LEN 20
+ unsigned char data[QDISC_CB_PRIV_LEN];
};
static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
@@ -259,7 +285,9 @@ static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
{
- return qdisc->dev_queue->qdisc;
+ struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
+
+ return q;
}
static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
@@ -376,7 +404,7 @@ struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
void __qdisc_calculate_pkt_len(struct sk_buff *skb,
const struct qdisc_size_table *stab);
void tcf_destroy(struct tcf_proto *tp);
-void tcf_destroy_chain(struct tcf_proto **fl);
+void tcf_destroy_chain(struct tcf_proto __rcu **fl);
/* Reset all TX qdiscs greater then index of a device. */
static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
@@ -384,7 +412,7 @@ static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
struct Qdisc *qdisc;
for (; i < dev->num_tx_queues; i++) {
- qdisc = netdev_get_tx_queue(dev, i)->qdisc;
+ qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
if (qdisc) {
spin_lock_bh(qdisc_lock(qdisc));
qdisc_reset(qdisc);
@@ -402,13 +430,18 @@ static inline void qdisc_reset_all_tx(struct net_device *dev)
static inline bool qdisc_all_tx_empty(const struct net_device *dev)
{
unsigned int i;
+
+ rcu_read_lock();
for (i = 0; i < dev->num_tx_queues; i++) {
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
- const struct Qdisc *q = txq->qdisc;
+ const struct Qdisc *q = rcu_dereference(txq->qdisc);
- if (q->q.qlen)
+ if (q->q.qlen) {
+ rcu_read_unlock();
return false;
+ }
}
+ rcu_read_unlock();
return true;
}
@@ -416,9 +449,10 @@ static inline bool qdisc_all_tx_empty(const struct net_device *dev)
static inline bool qdisc_tx_changing(const struct net_device *dev)
{
unsigned int i;
+
for (i = 0; i < dev->num_tx_queues; i++) {
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
- if (txq->qdisc != txq->qdisc_sleeping)
+ if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
return true;
}
return false;
@@ -428,9 +462,10 @@ static inline bool qdisc_tx_changing(const struct net_device *dev)
static inline bool qdisc_tx_is_noop(const struct net_device *dev)
{
unsigned int i;
+
for (i = 0; i < dev->num_tx_queues; i++) {
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
- if (txq->qdisc != &noop_qdisc)
+ if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
return false;
}
return true;
@@ -476,6 +511,10 @@ static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
}
+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,
const struct sk_buff *skb)
@@ -484,17 +523,62 @@ static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
}
+static inline void qdisc_bstats_update_cpu(struct Qdisc *sch,
+ const struct sk_buff *skb)
+{
+ struct gnet_stats_basic_cpu *bstats =
+ this_cpu_ptr(sch->cpu_bstats);
+
+ u64_stats_update_begin(&bstats->syncp);
+ bstats_update(&bstats->bstats, skb);
+ u64_stats_update_end(&bstats->syncp);
+}
+
static inline void qdisc_bstats_update(struct Qdisc *sch,
const struct sk_buff *skb)
{
bstats_update(&sch->bstats, skb);
}
+static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
+ const struct sk_buff *skb)
+{
+ sch->qstats.backlog -= qdisc_pkt_len(skb);
+}
+
+static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
+ const struct sk_buff *skb)
+{
+ sch->qstats.backlog += qdisc_pkt_len(skb);
+}
+
+static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
+{
+ sch->qstats.drops += count;
+}
+
+static inline void qdisc_qstats_drop(struct Qdisc *sch)
+{
+ sch->qstats.drops++;
+}
+
+static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch)
+{
+ struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats);
+
+ qstats->drops++;
+}
+
+static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
+{
+ sch->qstats.overlimits++;
+}
+
static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff_head *list)
{
__skb_queue_tail(list, skb);
- sch->qstats.backlog += qdisc_pkt_len(skb);
+ qdisc_qstats_backlog_inc(sch, skb);
return NET_XMIT_SUCCESS;
}
@@ -510,7 +594,7 @@ static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
struct sk_buff *skb = __skb_dequeue(list);
if (likely(skb != NULL)) {
- sch->qstats.backlog -= qdisc_pkt_len(skb);
+ qdisc_qstats_backlog_dec(sch, skb);
qdisc_bstats_update(sch, skb);
}
@@ -529,7 +613,7 @@ static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
if (likely(skb != NULL)) {
unsigned int len = qdisc_pkt_len(skb);
- sch->qstats.backlog -= len;
+ qdisc_qstats_backlog_dec(sch, skb);
kfree_skb(skb);
return len;
}
@@ -548,7 +632,7 @@ static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
struct sk_buff *skb = __skb_dequeue_tail(list);
if (likely(skb != NULL))
- sch->qstats.backlog -= qdisc_pkt_len(skb);
+ qdisc_qstats_backlog_dec(sch, skb);
return skb;
}
@@ -630,14 +714,14 @@ static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
{
kfree_skb(skb);
- sch->qstats.drops++;
+ qdisc_qstats_drop(sch);
return NET_XMIT_DROP;
}
static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
{
- sch->qstats.drops++;
+ qdisc_qstats_drop(sch);
#ifdef CONFIG_NET_CLS_ACT
if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-12 16:21:29 +0000