| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __NET_SCHED_GENERIC_H |
| #define __NET_SCHED_GENERIC_H |
| |
| #include <linux/netdevice.h> |
| #include <linux/types.h> |
| #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 <linux/list.h> |
| #include <linux/refcount.h> |
| #include <linux/workqueue.h> |
| #include <linux/mutex.h> |
| #include <linux/rwsem.h> |
| #include <linux/atomic.h> |
| #include <linux/hashtable.h> |
| #include <net/gen_stats.h> |
| #include <net/rtnetlink.h> |
| #include <net/flow_offload.h> |
| #include <linux/xarray.h> |
| |
| struct Qdisc_ops; |
| struct qdisc_walker; |
| struct tcf_walker; |
| struct module; |
| struct bpf_flow_keys; |
| |
| struct qdisc_rate_table { |
| struct tc_ratespec rate; |
| u32 data[256]; |
| struct qdisc_rate_table *next; |
| int refcnt; |
| }; |
| |
| enum qdisc_state_t { |
| __QDISC_STATE_SCHED, |
| __QDISC_STATE_DEACTIVATED, |
| __QDISC_STATE_MISSED, |
| __QDISC_STATE_DRAINING, |
| }; |
| |
| enum qdisc_state2_t { |
| /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly. |
| * Use qdisc_run_begin/end() or qdisc_is_running() instead. |
| */ |
| __QDISC_STATE2_RUNNING, |
| }; |
| |
| #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED) |
| #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING) |
| |
| #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \ |
| QDISC_STATE_DRAINING) |
| |
| struct qdisc_size_table { |
| struct rcu_head rcu; |
| struct list_head list; |
| struct tc_sizespec szopts; |
| int refcnt; |
| u16 data[]; |
| }; |
| |
| /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
| struct qdisc_skb_head { |
| struct sk_buff *head; |
| struct sk_buff *tail; |
| __u32 qlen; |
| spinlock_t lock; |
| }; |
| |
| struct Qdisc { |
| int (*enqueue)(struct sk_buff *skb, |
| struct Qdisc *sch, |
| struct sk_buff **to_free); |
| struct sk_buff * (*dequeue)(struct Qdisc *sch); |
| unsigned int flags; |
| #define TCQ_F_BUILTIN 1 |
| #define TCQ_F_INGRESS 2 |
| #define TCQ_F_CAN_BYPASS 4 |
| #define TCQ_F_MQROOT 8 |
| #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
| * q->dev_queue : It can test |
| * netif_xmit_frozen_or_stopped() before |
| * dequeueing next packet. |
| * Its true for MQ/MQPRIO slaves, or non |
| * multiqueue device. |
| */ |
| #define TCQ_F_WARN_NONWC (1 << 16) |
| #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
| #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
| * qdisc_tree_decrease_qlen() should stop. |
| */ |
| #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
| #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ |
| #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ |
| u32 limit; |
| const struct Qdisc_ops *ops; |
| struct qdisc_size_table __rcu *stab; |
| struct hlist_node hash; |
| u32 handle; |
| u32 parent; |
| |
| struct netdev_queue *dev_queue; |
| |
| struct net_rate_estimator __rcu *rate_est; |
| struct gnet_stats_basic_sync __percpu *cpu_bstats; |
| struct gnet_stats_queue __percpu *cpu_qstats; |
| int pad; |
| refcount_t refcnt; |
| |
| /* |
| * For performance sake on SMP, we put highly modified fields at the end |
| */ |
| struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; |
| struct qdisc_skb_head q; |
| struct gnet_stats_basic_sync bstats; |
| struct gnet_stats_queue qstats; |
| unsigned long state; |
| unsigned long state2; /* must be written under qdisc spinlock */ |
| struct Qdisc *next_sched; |
| struct sk_buff_head skb_bad_txq; |
| |
| spinlock_t busylock ____cacheline_aligned_in_smp; |
| spinlock_t seqlock; |
| |
| struct rcu_head rcu; |
| netdevice_tracker dev_tracker; |
| /* private data */ |
| long privdata[] ____cacheline_aligned; |
| }; |
| |
| static inline void qdisc_refcount_inc(struct Qdisc *qdisc) |
| { |
| if (qdisc->flags & TCQ_F_BUILTIN) |
| return; |
| refcount_inc(&qdisc->refcnt); |
| } |
| |
| static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc) |
| { |
| if (qdisc->flags & TCQ_F_BUILTIN) |
| return true; |
| return refcount_dec_if_one(&qdisc->refcnt); |
| } |
| |
| /* Intended to be used by unlocked users, when concurrent qdisc release is |
| * possible. |
| */ |
| |
| static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) |
| { |
| if (qdisc->flags & TCQ_F_BUILTIN) |
| return qdisc; |
| if (refcount_inc_not_zero(&qdisc->refcnt)) |
| return qdisc; |
| return NULL; |
| } |
| |
| /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc |
| * root_lock section, or provide their own memory barriers -- ordering |
| * against qdisc_run_begin/end() atomic bit operations. |
| */ |
| static inline bool qdisc_is_running(struct Qdisc *qdisc) |
| { |
| if (qdisc->flags & TCQ_F_NOLOCK) |
| return spin_is_locked(&qdisc->seqlock); |
| return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); |
| } |
| |
| static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc) |
| { |
| return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY); |
| } |
| |
| 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 nolock_qdisc_is_empty(qdisc); |
| return !READ_ONCE(qdisc->q.qlen); |
| } |
| |
| /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with |
| * the qdisc root lock acquired. |
| */ |
| static inline bool qdisc_run_begin(struct Qdisc *qdisc) |
| { |
| if (qdisc->flags & TCQ_F_NOLOCK) { |
| if (spin_trylock(&qdisc->seqlock)) |
| return true; |
| |
| /* No need to insist if the MISSED flag was already set. |
| * Note that test_and_set_bit() also gives us memory ordering |
| * guarantees wrt potential earlier enqueue() and below |
| * spin_trylock(), both of which are necessary to prevent races |
| */ |
| if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state)) |
| return false; |
| |
| /* Try to take the lock again to make sure that we will either |
| * grab it or the CPU that still has it will see MISSED set |
| * when testing it in qdisc_run_end() |
| */ |
| return spin_trylock(&qdisc->seqlock); |
| } |
| return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); |
| } |
| |
| static inline void qdisc_run_end(struct Qdisc *qdisc) |
| { |
| if (qdisc->flags & TCQ_F_NOLOCK) { |
| spin_unlock(&qdisc->seqlock); |
| |
| /* spin_unlock() only has store-release semantic. The unlock |
| * and test_bit() ordering is a store-load ordering, so a full |
| * memory barrier is needed here. |
| */ |
| smp_mb(); |
| |
| if (unlikely(test_bit(__QDISC_STATE_MISSED, |
| &qdisc->state))) |
| __netif_schedule(qdisc); |
| } else { |
| __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); |
| } |
| } |
| |
| 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 |
| } |
| |
| struct Qdisc_class_ops { |
| unsigned int flags; |
| /* Child qdisc manipulation */ |
| struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
| int (*graft)(struct Qdisc *, unsigned long cl, |
| struct Qdisc *, struct Qdisc **, |
| struct netlink_ext_ack *extack); |
| struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); |
| void (*qlen_notify)(struct Qdisc *, unsigned long); |
| |
| /* Class manipulation routines */ |
| unsigned long (*find)(struct Qdisc *, u32 classid); |
| int (*change)(struct Qdisc *, u32, u32, |
| struct nlattr **, unsigned long *, |
| struct netlink_ext_ack *); |
| int (*delete)(struct Qdisc *, unsigned long, |
| struct netlink_ext_ack *); |
| void (*walk)(struct Qdisc *, struct qdisc_walker * arg); |
| |
| /* Filter manipulation */ |
| struct tcf_block * (*tcf_block)(struct Qdisc *sch, |
| unsigned long arg, |
| struct netlink_ext_ack *extack); |
| unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
| u32 classid); |
| void (*unbind_tcf)(struct Qdisc *, unsigned long); |
| |
| /* rtnetlink specific */ |
| int (*dump)(struct Qdisc *, unsigned long, |
| struct sk_buff *skb, struct tcmsg*); |
| int (*dump_stats)(struct Qdisc *, unsigned long, |
| struct gnet_dump *); |
| }; |
| |
| /* Qdisc_class_ops flag values */ |
| |
| /* Implements API that doesn't require rtnl lock */ |
| enum qdisc_class_ops_flags { |
| QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, |
| }; |
| |
| struct Qdisc_ops { |
| struct Qdisc_ops *next; |
| const struct Qdisc_class_ops *cl_ops; |
| char id[IFNAMSIZ]; |
| int priv_size; |
| unsigned int static_flags; |
| |
| int (*enqueue)(struct sk_buff *skb, |
| struct Qdisc *sch, |
| struct sk_buff **to_free); |
| struct sk_buff * (*dequeue)(struct Qdisc *); |
| struct sk_buff * (*peek)(struct Qdisc *); |
| |
| int (*init)(struct Qdisc *sch, struct nlattr *arg, |
| struct netlink_ext_ack *extack); |
| void (*reset)(struct Qdisc *); |
| void (*destroy)(struct Qdisc *); |
| int (*change)(struct Qdisc *sch, |
| struct nlattr *arg, |
| struct netlink_ext_ack *extack); |
| void (*attach)(struct Qdisc *sch); |
| int (*change_tx_queue_len)(struct Qdisc *, unsigned int); |
| void (*change_real_num_tx)(struct Qdisc *sch, |
| unsigned int new_real_tx); |
| |
| int (*dump)(struct Qdisc *, struct sk_buff *); |
| int (*dump_stats)(struct Qdisc *, struct gnet_dump *); |
| |
| void (*ingress_block_set)(struct Qdisc *sch, |
| u32 block_index); |
| void (*egress_block_set)(struct Qdisc *sch, |
| u32 block_index); |
| u32 (*ingress_block_get)(struct Qdisc *sch); |
| u32 (*egress_block_get)(struct Qdisc *sch); |
| |
| struct module *owner; |
| }; |
| |
| struct tcf_result { |
| union { |
| struct { |
| unsigned long class; |
| u32 classid; |
| }; |
| const struct tcf_proto *goto_tp; |
| }; |
| }; |
| |
| struct tcf_chain; |
| |
| struct tcf_proto_ops { |
| struct list_head head; |
| char kind[IFNAMSIZ]; |
| |
| int (*classify)(struct sk_buff *, |
| const struct tcf_proto *, |
| struct tcf_result *); |
| int (*init)(struct tcf_proto*); |
| void (*destroy)(struct tcf_proto *tp, bool rtnl_held, |
| struct netlink_ext_ack *extack); |
| |
| void* (*get)(struct tcf_proto*, u32 handle); |
| void (*put)(struct tcf_proto *tp, void *f); |
| int (*change)(struct net *net, struct sk_buff *, |
| struct tcf_proto*, unsigned long, |
| u32 handle, struct nlattr **, |
| void **, u32, |
| struct netlink_ext_ack *); |
| int (*delete)(struct tcf_proto *tp, void *arg, |
| bool *last, bool rtnl_held, |
| struct netlink_ext_ack *); |
| bool (*delete_empty)(struct tcf_proto *tp); |
| void (*walk)(struct tcf_proto *tp, |
| struct tcf_walker *arg, bool rtnl_held); |
| int (*reoffload)(struct tcf_proto *tp, bool add, |
| flow_setup_cb_t *cb, void *cb_priv, |
| struct netlink_ext_ack *extack); |
| void (*hw_add)(struct tcf_proto *tp, |
| void *type_data); |
| void (*hw_del)(struct tcf_proto *tp, |
| void *type_data); |
| void (*bind_class)(void *, u32, unsigned long, |
| void *, unsigned long); |
| void * (*tmplt_create)(struct net *net, |
| struct tcf_chain *chain, |
| struct nlattr **tca, |
| struct netlink_ext_ack *extack); |
| void (*tmplt_destroy)(void *tmplt_priv); |
| void (*tmplt_reoffload)(struct tcf_chain *chain, |
| bool add, |
| flow_setup_cb_t *cb, |
| void *cb_priv); |
| struct tcf_exts * (*get_exts)(const struct tcf_proto *tp, |
| u32 handle); |
| |
| /* rtnetlink specific */ |
| int (*dump)(struct net*, struct tcf_proto*, void *, |
| struct sk_buff *skb, struct tcmsg*, |
| bool); |
| int (*terse_dump)(struct net *net, |
| struct tcf_proto *tp, void *fh, |
| struct sk_buff *skb, |
| struct tcmsg *t, bool rtnl_held); |
| int (*tmplt_dump)(struct sk_buff *skb, |
| struct net *net, |
| void *tmplt_priv); |
| |
| struct module *owner; |
| int flags; |
| }; |
| |
| /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags |
| * are expected to implement tcf_proto_ops->delete_empty(), otherwise race |
| * conditions can occur when filters are inserted/deleted simultaneously. |
| */ |
| enum tcf_proto_ops_flags { |
| TCF_PROTO_OPS_DOIT_UNLOCKED = 1, |
| }; |
| |
| struct tcf_proto { |
| /* Fast access part */ |
| struct tcf_proto __rcu *next; |
| void __rcu *root; |
| |
| /* called under RCU BH lock*/ |
| int (*classify)(struct sk_buff *, |
| const struct tcf_proto *, |
| struct tcf_result *); |
| __be16 protocol; |
| |
| /* All the rest */ |
| u32 prio; |
| void *data; |
| const struct tcf_proto_ops *ops; |
| struct tcf_chain *chain; |
| /* Lock protects tcf_proto shared state and can be used by unlocked |
| * classifiers to protect their private data. |
| */ |
| spinlock_t lock; |
| bool deleting; |
| refcount_t refcnt; |
| struct rcu_head rcu; |
| struct hlist_node destroy_ht_node; |
| }; |
| |
| struct qdisc_skb_cb { |
| 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]; |
| }; |
| |
| typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); |
| |
| struct tcf_chain { |
| /* Protects filter_chain. */ |
| struct mutex filter_chain_lock; |
| struct tcf_proto __rcu *filter_chain; |
| struct list_head list; |
| struct tcf_block *block; |
| u32 index; /* chain index */ |
| unsigned int refcnt; |
| unsigned int action_refcnt; |
| bool explicitly_created; |
| bool flushing; |
| const struct tcf_proto_ops *tmplt_ops; |
| void *tmplt_priv; |
| struct rcu_head rcu; |
| }; |
| |
| struct tcf_block { |
| struct xarray ports; /* datapath accessible */ |
| /* Lock protects tcf_block and lifetime-management data of chains |
| * attached to the block (refcnt, action_refcnt, explicitly_created). |
| */ |
| struct mutex lock; |
| struct list_head chain_list; |
| u32 index; /* block index for shared blocks */ |
| u32 classid; /* which class this block belongs to */ |
| refcount_t refcnt; |
| struct net *net; |
| struct Qdisc *q; |
| struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ |
| struct flow_block flow_block; |
| struct list_head owner_list; |
| bool keep_dst; |
| atomic_t offloadcnt; /* Number of oddloaded filters */ |
| unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ |
| unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ |
| struct { |
| struct tcf_chain *chain; |
| struct list_head filter_chain_list; |
| } chain0; |
| struct rcu_head rcu; |
| DECLARE_HASHTABLE(proto_destroy_ht, 7); |
| struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ |
| }; |
| |
| struct tcf_block *tcf_block_lookup(struct net *net, u32 block_index); |
| |
| static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) |
| { |
| return lockdep_is_held(&chain->filter_chain_lock); |
| } |
| |
| static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) |
| { |
| return lockdep_is_held(&tp->lock); |
| } |
| |
| #define tcf_chain_dereference(p, chain) \ |
| rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) |
| |
| #define tcf_proto_dereference(p, tp) \ |
| rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) |
| |
| static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
| { |
| struct qdisc_skb_cb *qcb; |
| |
| BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); |
| BUILD_BUG_ON(sizeof(qcb->data) < sz); |
| } |
| |
| static inline int qdisc_qlen(const struct Qdisc *q) |
| { |
| return q->q.qlen; |
| } |
| |
| static inline int qdisc_qlen_sum(const struct Qdisc *q) |
| { |
| __u32 qlen = q->qstats.qlen; |
| int i; |
| |
| 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; |
| } |
| |
| static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
| { |
| return (struct qdisc_skb_cb *)skb->cb; |
| } |
| |
| static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
| { |
| return &qdisc->q.lock; |
| } |
| |
| static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
| { |
| struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
| |
| return q; |
| } |
| |
| static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) |
| { |
| return rcu_dereference_bh(qdisc->dev_queue->qdisc); |
| } |
| |
| static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
| { |
| return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); |
| } |
| |
| static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
| { |
| struct Qdisc *root = qdisc_root_sleeping(qdisc); |
| |
| ASSERT_RTNL(); |
| return qdisc_lock(root); |
| } |
| |
| static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
| { |
| return qdisc->dev_queue->dev; |
| } |
| |
| static inline void sch_tree_lock(struct Qdisc *q) |
| { |
| if (q->flags & TCQ_F_MQROOT) |
| spin_lock_bh(qdisc_lock(q)); |
| else |
| spin_lock_bh(qdisc_root_sleeping_lock(q)); |
| } |
| |
| static inline void sch_tree_unlock(struct Qdisc *q) |
| { |
| if (q->flags & TCQ_F_MQROOT) |
| spin_unlock_bh(qdisc_lock(q)); |
| else |
| spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
| } |
| |
| extern struct Qdisc noop_qdisc; |
| extern struct Qdisc_ops noop_qdisc_ops; |
| extern struct Qdisc_ops pfifo_fast_ops; |
| extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; |
| extern struct Qdisc_ops mq_qdisc_ops; |
| extern struct Qdisc_ops noqueue_qdisc_ops; |
| extern const struct Qdisc_ops *default_qdisc_ops; |
| static inline const struct Qdisc_ops * |
| get_default_qdisc_ops(const struct net_device *dev, int ntx) |
| { |
| return ntx < dev->real_num_tx_queues ? |
| default_qdisc_ops : &pfifo_fast_ops; |
| } |
| |
| struct Qdisc_class_common { |
| u32 classid; |
| unsigned int filter_cnt; |
| struct hlist_node hnode; |
| }; |
| |
| struct Qdisc_class_hash { |
| struct hlist_head *hash; |
| unsigned int hashsize; |
| unsigned int hashmask; |
| unsigned int hashelems; |
| }; |
| |
| static inline unsigned int qdisc_class_hash(u32 id, u32 mask) |
| { |
| id ^= id >> 8; |
| id ^= id >> 4; |
| return id & mask; |
| } |
| |
| static inline struct Qdisc_class_common * |
| qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
| { |
| struct Qdisc_class_common *cl; |
| unsigned int h; |
| |
| if (!id) |
| return NULL; |
| |
| h = qdisc_class_hash(id, hash->hashmask); |
| hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
| if (cl->classid == id) |
| return cl; |
| } |
| return NULL; |
| } |
| |
| static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) |
| { |
| return cl->filter_cnt > 0; |
| } |
| |
| static inline void qdisc_class_get(struct Qdisc_class_common *cl) |
| { |
| unsigned int res; |
| |
| if (check_add_overflow(cl->filter_cnt, 1, &res)) |
| WARN(1, "Qdisc class overflow"); |
| |
| cl->filter_cnt = res; |
| } |
| |
| static inline void qdisc_class_put(struct Qdisc_class_common *cl) |
| { |
| unsigned int res; |
| |
| if (check_sub_overflow(cl->filter_cnt, 1, &res)) |
| WARN(1, "Qdisc class underflow"); |
| |
| cl->filter_cnt = res; |
| } |
| |
| static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) |
| { |
| u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; |
| |
| return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; |
| } |
| |
| int qdisc_class_hash_init(struct Qdisc_class_hash *); |
| void qdisc_class_hash_insert(struct Qdisc_class_hash *, |
| struct Qdisc_class_common *); |
| void qdisc_class_hash_remove(struct Qdisc_class_hash *, |
| struct Qdisc_class_common *); |
| void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); |
| void qdisc_class_hash_destroy(struct Qdisc_class_hash *); |
| |
| int dev_qdisc_change_tx_queue_len(struct net_device *dev); |
| void dev_qdisc_change_real_num_tx(struct net_device *dev, |
| unsigned int new_real_tx); |
| void dev_init_scheduler(struct net_device *dev); |
| void dev_shutdown(struct net_device *dev); |
| void dev_activate(struct net_device *dev); |
| void dev_deactivate(struct net_device *dev); |
| void dev_deactivate_many(struct list_head *head); |
| struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
| struct Qdisc *qdisc); |
| void qdisc_reset(struct Qdisc *qdisc); |
| void qdisc_destroy(struct Qdisc *qdisc); |
| void qdisc_put(struct Qdisc *qdisc); |
| void qdisc_put_unlocked(struct Qdisc *qdisc); |
| void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); |
| #ifdef CONFIG_NET_SCHED |
| int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, |
| void *type_data); |
| void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
| struct Qdisc *new, struct Qdisc *old, |
| enum tc_setup_type type, void *type_data, |
| struct netlink_ext_ack *extack); |
| #else |
| static inline int |
| qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, |
| void *type_data) |
| { |
| q->flags &= ~TCQ_F_OFFLOADED; |
| return 0; |
| } |
| |
| static inline void |
| qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
| struct Qdisc *new, struct Qdisc *old, |
| enum tc_setup_type type, void *type_data, |
| struct netlink_ext_ack *extack) |
| { |
| } |
| #endif |
| void qdisc_offload_query_caps(struct net_device *dev, |
| enum tc_setup_type type, |
| void *caps, size_t caps_len); |
| struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
| const struct Qdisc_ops *ops, |
| struct netlink_ext_ack *extack); |
| void qdisc_free(struct Qdisc *qdisc); |
| struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
| const struct Qdisc_ops *ops, u32 parentid, |
| struct netlink_ext_ack *extack); |
| void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
| const struct qdisc_size_table *stab); |
| int skb_do_redirect(struct sk_buff *); |
| |
| static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
| { |
| #ifdef CONFIG_NET_XGRESS |
| return skb->tc_at_ingress; |
| #else |
| return false; |
| #endif |
| } |
| |
| static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
| { |
| #ifdef CONFIG_NET_CLS_ACT |
| if (skb->tc_skip_classify) { |
| skb->tc_skip_classify = 0; |
| return true; |
| } |
| #endif |
| return false; |
| } |
| |
| /* Reset all TX qdiscs greater than index of a device. */ |
| 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 = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
| if (qdisc) { |
| spin_lock_bh(qdisc_lock(qdisc)); |
| qdisc_reset(qdisc); |
| spin_unlock_bh(qdisc_lock(qdisc)); |
| } |
| } |
| } |
| |
| /* Are all TX queues of the device empty? */ |
| 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 = rcu_dereference(txq->qdisc); |
| |
| if (!qdisc_is_empty(q)) { |
| rcu_read_unlock(); |
| return false; |
| } |
| } |
| rcu_read_unlock(); |
| return true; |
| } |
| |
| /* Are any of the TX qdiscs changing? */ |
| 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 (rcu_access_pointer(txq->qdisc) != |
| rcu_access_pointer(txq->qdisc_sleeping)) |
| return true; |
| } |
| return false; |
| } |
| |
| /* Is the device using the noop qdisc on all queues? */ |
| 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 (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
| return false; |
| } |
| return true; |
| } |
| |
| static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
| { |
| return qdisc_skb_cb(skb)->pkt_len; |
| } |
| |
| /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
| enum net_xmit_qdisc_t { |
| __NET_XMIT_STOLEN = 0x00010000, |
| __NET_XMIT_BYPASS = 0x00020000, |
| }; |
| |
| #ifdef CONFIG_NET_CLS_ACT |
| #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
| #else |
| #define net_xmit_drop_count(e) (1) |
| #endif |
| |
| static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
| const struct Qdisc *sch) |
| { |
| #ifdef CONFIG_NET_SCHED |
| struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
| |
| if (stab) |
| __qdisc_calculate_pkt_len(skb, stab); |
| #endif |
| } |
| |
| static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
| struct sk_buff **to_free) |
| { |
| qdisc_calculate_pkt_len(skb, sch); |
| return sch->enqueue(skb, sch, to_free); |
| } |
| |
| static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, |
| __u64 bytes, __u32 packets) |
| { |
| u64_stats_update_begin(&bstats->syncp); |
| u64_stats_add(&bstats->bytes, bytes); |
| u64_stats_add(&bstats->packets, packets); |
| u64_stats_update_end(&bstats->syncp); |
| } |
| |
| static inline void bstats_update(struct gnet_stats_basic_sync *bstats, |
| const struct sk_buff *skb) |
| { |
| _bstats_update(bstats, |
| qdisc_pkt_len(skb), |
| skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); |
| } |
| |
| static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
| const struct sk_buff *skb) |
| { |
| bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); |
| } |
| |
| 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_cpu_backlog_dec(struct Qdisc *sch, |
| const struct sk_buff *skb) |
| { |
| this_cpu_sub(sch->cpu_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_cpu_backlog_inc(struct Qdisc *sch, |
| const struct sk_buff *skb) |
| { |
| this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); |
| } |
| |
| static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) |
| { |
| this_cpu_inc(sch->cpu_qstats->qlen); |
| } |
| |
| static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) |
| { |
| this_cpu_dec(sch->cpu_qstats->qlen); |
| } |
| |
| static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) |
| { |
| this_cpu_inc(sch->cpu_qstats->requeues); |
| } |
| |
| static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) |
| { |
| sch->qstats.drops += count; |
| } |
| |
| static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
| { |
| qstats->drops++; |
| } |
| |
| static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
| { |
| qstats->overlimits++; |
| } |
| |
| static inline void qdisc_qstats_drop(struct Qdisc *sch) |
| { |
| qstats_drop_inc(&sch->qstats); |
| } |
| |
| static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) |
| { |
| this_cpu_inc(sch->cpu_qstats->drops); |
| } |
| |
| static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
| { |
| sch->qstats.overlimits++; |
| } |
| |
| static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) |
| { |
| __u32 qlen = qdisc_qlen_sum(sch); |
| |
| return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); |
| } |
| |
| static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, |
| __u32 *backlog) |
| { |
| struct gnet_stats_queue qstats = { 0 }; |
| |
| gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats); |
| *qlen = qstats.qlen + qdisc_qlen(sch); |
| *backlog = qstats.backlog; |
| } |
| |
| static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) |
| { |
| __u32 qlen, backlog; |
| |
| qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); |
| qdisc_tree_reduce_backlog(sch, qlen, backlog); |
| } |
| |
| static inline void qdisc_purge_queue(struct Qdisc *sch) |
| { |
| __u32 qlen, backlog; |
| |
| qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); |
| qdisc_reset(sch); |
| qdisc_tree_reduce_backlog(sch, qlen, backlog); |
| } |
| |
| static inline void __qdisc_enqueue_tail(struct sk_buff *skb, |
| struct qdisc_skb_head *qh) |
| { |
| struct sk_buff *last = qh->tail; |
| |
| if (last) { |
| skb->next = NULL; |
| last->next = skb; |
| qh->tail = skb; |
| } else { |
| qh->tail = skb; |
| qh->head = skb; |
| } |
| qh->qlen++; |
| } |
| |
| static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) |
| { |
| __qdisc_enqueue_tail(skb, &sch->q); |
| qdisc_qstats_backlog_inc(sch, skb); |
| return NET_XMIT_SUCCESS; |
| } |
| |
| static inline void __qdisc_enqueue_head(struct sk_buff *skb, |
| struct qdisc_skb_head *qh) |
| { |
| skb->next = qh->head; |
| |
| if (!qh->head) |
| qh->tail = skb; |
| qh->head = skb; |
| qh->qlen++; |
| } |
| |
| static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
| { |
| struct sk_buff *skb = qh->head; |
| |
| if (likely(skb != NULL)) { |
| qh->head = skb->next; |
| qh->qlen--; |
| if (qh->head == NULL) |
| qh->tail = NULL; |
| skb->next = NULL; |
| } |
| |
| return skb; |
| } |
| |
| static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) |
| { |
| struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); |
| |
| if (likely(skb != NULL)) { |
| qdisc_qstats_backlog_dec(sch, skb); |
| qdisc_bstats_update(sch, skb); |
| } |
| |
| return skb; |
| } |
| |
| struct tc_skb_cb { |
| struct qdisc_skb_cb qdisc_cb; |
| u32 drop_reason; |
| |
| u16 zone; /* Only valid if post_ct = true */ |
| u16 mru; |
| u8 post_ct:1; |
| u8 post_ct_snat:1; |
| u8 post_ct_dnat:1; |
| }; |
| |
| static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) |
| { |
| struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; |
| |
| BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); |
| return cb; |
| } |
| |
| static inline enum skb_drop_reason |
| tcf_get_drop_reason(const struct sk_buff *skb) |
| { |
| return tc_skb_cb(skb)->drop_reason; |
| } |
| |
| static inline void tcf_set_drop_reason(const struct sk_buff *skb, |
| enum skb_drop_reason reason) |
| { |
| tc_skb_cb(skb)->drop_reason = reason; |
| } |
| |
| /* Instead of calling kfree_skb() while root qdisc lock is held, |
| * queue the skb for future freeing at end of __dev_xmit_skb() |
| */ |
| static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) |
| { |
| skb->next = *to_free; |
| *to_free = skb; |
| } |
| |
| static inline void __qdisc_drop_all(struct sk_buff *skb, |
| struct sk_buff **to_free) |
| { |
| if (skb->prev) |
| skb->prev->next = *to_free; |
| else |
| skb->next = *to_free; |
| *to_free = skb; |
| } |
| |
| static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
| struct qdisc_skb_head *qh, |
| struct sk_buff **to_free) |
| { |
| struct sk_buff *skb = __qdisc_dequeue_head(qh); |
| |
| if (likely(skb != NULL)) { |
| unsigned int len = qdisc_pkt_len(skb); |
| |
| qdisc_qstats_backlog_dec(sch, skb); |
| __qdisc_drop(skb, to_free); |
| return len; |
| } |
| |
| return 0; |
| } |
| |
| static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
| { |
| const struct qdisc_skb_head *qh = &sch->q; |
| |
| return qh->head; |
| } |
| |
| /* generic pseudo peek method for non-work-conserving qdisc */ |
| static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) |
| { |
| struct sk_buff *skb = skb_peek(&sch->gso_skb); |
| |
| /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ |
| if (!skb) { |
| skb = sch->dequeue(sch); |
| |
| if (skb) { |
| __skb_queue_head(&sch->gso_skb, skb); |
| /* it's still part of the queue */ |
| qdisc_qstats_backlog_inc(sch, skb); |
| sch->q.qlen++; |
| } |
| } |
| |
| 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) |
| { |
| struct sk_buff *skb = skb_peek(&sch->gso_skb); |
| |
| if (skb) { |
| skb = __skb_dequeue(&sch->gso_skb); |
| 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); |
| } |
| |
| return skb; |
| } |
| |
| static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
| { |
| /* |
| * We do not know the backlog in bytes of this list, it |
| * is up to the caller to correct it |
| */ |
| ASSERT_RTNL(); |
| if (qh->qlen) { |
| rtnl_kfree_skbs(qh->head, qh->tail); |
| |
| qh->head = NULL; |
| qh->tail = NULL; |
| qh->qlen = 0; |
| } |
| } |
| |
| static inline void qdisc_reset_queue(struct Qdisc *sch) |
| { |
| __qdisc_reset_queue(&sch->q); |
| } |
| |
| static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
| struct Qdisc **pold) |
| { |
| struct Qdisc *old; |
| |
| sch_tree_lock(sch); |
| old = *pold; |
| *pold = new; |
| if (old != NULL) |
| qdisc_purge_queue(old); |
| sch_tree_unlock(sch); |
| |
| return old; |
| } |
| |
| static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
| { |
| rtnl_kfree_skbs(skb, skb); |
| qdisc_qstats_drop(sch); |
| } |
| |
| static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, |
| struct sk_buff **to_free) |
| { |
| __qdisc_drop(skb, to_free); |
| qdisc_qstats_cpu_drop(sch); |
| |
| return NET_XMIT_DROP; |
| } |
| |
| static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, |
| struct sk_buff **to_free) |
| { |
| __qdisc_drop(skb, to_free); |
| qdisc_qstats_drop(sch); |
| |
| return NET_XMIT_DROP; |
| } |
| |
| static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, |
| struct sk_buff **to_free) |
| { |
| __qdisc_drop_all(skb, to_free); |
| qdisc_qstats_drop(sch); |
| |
| return NET_XMIT_DROP; |
| } |
| |
| struct psched_ratecfg { |
| u64 rate_bytes_ps; /* bytes per second */ |
| u32 mult; |
| u16 overhead; |
| u16 mpu; |
| u8 linklayer; |
| u8 shift; |
| }; |
| |
| static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, |
| unsigned int len) |
| { |
| len += r->overhead; |
| |
| if (len < r->mpu) |
| len = r->mpu; |
| |
| if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) |
| return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; |
| |
| return ((u64)len * r->mult) >> r->shift; |
| } |
| |
| void psched_ratecfg_precompute(struct psched_ratecfg *r, |
| const struct tc_ratespec *conf, |
| u64 rate64); |
| |
| static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
| const struct psched_ratecfg *r) |
| { |
| memset(res, 0, sizeof(*res)); |
| |
| /* legacy struct tc_ratespec has a 32bit @rate field |
| * Qdisc using 64bit rate should add new attributes |
| * in order to maintain compatibility. |
| */ |
| res->rate = min_t(u64, r->rate_bytes_ps, ~0U); |
| |
| res->overhead = r->overhead; |
| res->mpu = r->mpu; |
| res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
| } |
| |
| struct psched_pktrate { |
| u64 rate_pkts_ps; /* packets per second */ |
| u32 mult; |
| u8 shift; |
| }; |
| |
| static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, |
| unsigned int pkt_num) |
| { |
| return ((u64)pkt_num * r->mult) >> r->shift; |
| } |
| |
| void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); |
| |
| /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. |
| * The fast path only needs to access filter list and to update stats |
| */ |
| struct mini_Qdisc { |
| struct tcf_proto *filter_list; |
| struct tcf_block *block; |
| struct gnet_stats_basic_sync __percpu *cpu_bstats; |
| struct gnet_stats_queue __percpu *cpu_qstats; |
| unsigned long rcu_state; |
| }; |
| |
| static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, |
| const struct sk_buff *skb) |
| { |
| bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); |
| } |
| |
| static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) |
| { |
| this_cpu_inc(miniq->cpu_qstats->drops); |
| } |
| |
| struct mini_Qdisc_pair { |
| struct mini_Qdisc miniq1; |
| struct mini_Qdisc miniq2; |
| struct mini_Qdisc __rcu **p_miniq; |
| }; |
| |
| void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, |
| struct tcf_proto *tp_head); |
| void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, |
| struct mini_Qdisc __rcu **p_miniq); |
| void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, |
| struct tcf_block *block); |
| |
| void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); |
| |
| int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); |
| |
| /* Make sure qdisc is no longer in SCHED state. */ |
| static inline void qdisc_synchronize(const struct Qdisc *q) |
| { |
| while (test_bit(__QDISC_STATE_SCHED, &q->state)) |
| msleep(1); |
| } |
| |
| #endif |