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0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __NET_SCHED_GENERIC_H
0003 #define __NET_SCHED_GENERIC_H
0004 
0005 #include <linux/netdevice.h>
0006 #include <linux/types.h>
0007 #include <linux/rcupdate.h>
0008 #include <linux/pkt_sched.h>
0009 #include <linux/pkt_cls.h>
0010 #include <linux/percpu.h>
0011 #include <linux/dynamic_queue_limits.h>
0012 #include <linux/list.h>
0013 #include <linux/refcount.h>
0014 #include <linux/workqueue.h>
0015 #include <linux/mutex.h>
0016 #include <linux/rwsem.h>
0017 #include <linux/atomic.h>
0018 #include <linux/hashtable.h>
0019 #include <net/gen_stats.h>
0020 #include <net/rtnetlink.h>
0021 #include <net/flow_offload.h>
0022 
0023 struct Qdisc_ops;
0024 struct qdisc_walker;
0025 struct tcf_walker;
0026 struct module;
0027 struct bpf_flow_keys;
0028 
0029 struct qdisc_rate_table {
0030     struct tc_ratespec rate;
0031     u32     data[256];
0032     struct qdisc_rate_table *next;
0033     int     refcnt;
0034 };
0035 
0036 enum qdisc_state_t {
0037     __QDISC_STATE_SCHED,
0038     __QDISC_STATE_DEACTIVATED,
0039     __QDISC_STATE_MISSED,
0040     __QDISC_STATE_DRAINING,
0041 };
0042 
0043 enum qdisc_state2_t {
0044     /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly.
0045      * Use qdisc_run_begin/end() or qdisc_is_running() instead.
0046      */
0047     __QDISC_STATE2_RUNNING,
0048 };
0049 
0050 #define QDISC_STATE_MISSED  BIT(__QDISC_STATE_MISSED)
0051 #define QDISC_STATE_DRAINING    BIT(__QDISC_STATE_DRAINING)
0052 
0053 #define QDISC_STATE_NON_EMPTY   (QDISC_STATE_MISSED | \
0054                     QDISC_STATE_DRAINING)
0055 
0056 struct qdisc_size_table {
0057     struct rcu_head     rcu;
0058     struct list_head    list;
0059     struct tc_sizespec  szopts;
0060     int         refcnt;
0061     u16         data[];
0062 };
0063 
0064 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
0065 struct qdisc_skb_head {
0066     struct sk_buff  *head;
0067     struct sk_buff  *tail;
0068     __u32       qlen;
0069     spinlock_t  lock;
0070 };
0071 
0072 struct Qdisc {
0073     int             (*enqueue)(struct sk_buff *skb,
0074                        struct Qdisc *sch,
0075                        struct sk_buff **to_free);
0076     struct sk_buff *    (*dequeue)(struct Qdisc *sch);
0077     unsigned int        flags;
0078 #define TCQ_F_BUILTIN       1
0079 #define TCQ_F_INGRESS       2
0080 #define TCQ_F_CAN_BYPASS    4
0081 #define TCQ_F_MQROOT        8
0082 #define TCQ_F_ONETXQUEUE    0x10 /* dequeue_skb() can assume all skbs are for
0083                       * q->dev_queue : It can test
0084                       * netif_xmit_frozen_or_stopped() before
0085                       * dequeueing next packet.
0086                       * Its true for MQ/MQPRIO slaves, or non
0087                       * multiqueue device.
0088                       */
0089 #define TCQ_F_WARN_NONWC    (1 << 16)
0090 #define TCQ_F_CPUSTATS      0x20 /* run using percpu statistics */
0091 #define TCQ_F_NOPARENT      0x40 /* root of its hierarchy :
0092                       * qdisc_tree_decrease_qlen() should stop.
0093                       */
0094 #define TCQ_F_INVISIBLE     0x80 /* invisible by default in dump */
0095 #define TCQ_F_NOLOCK        0x100 /* qdisc does not require locking */
0096 #define TCQ_F_OFFLOADED     0x200 /* qdisc is offloaded to HW */
0097     u32         limit;
0098     const struct Qdisc_ops  *ops;
0099     struct qdisc_size_table __rcu *stab;
0100     struct hlist_node       hash;
0101     u32         handle;
0102     u32         parent;
0103 
0104     struct netdev_queue *dev_queue;
0105 
0106     struct net_rate_estimator __rcu *rate_est;
0107     struct gnet_stats_basic_sync __percpu *cpu_bstats;
0108     struct gnet_stats_queue __percpu *cpu_qstats;
0109     int         pad;
0110     refcount_t      refcnt;
0111 
0112     /*
0113      * For performance sake on SMP, we put highly modified fields at the end
0114      */
0115     struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
0116     struct qdisc_skb_head   q;
0117     struct gnet_stats_basic_sync bstats;
0118     struct gnet_stats_queue qstats;
0119     unsigned long       state;
0120     unsigned long       state2; /* must be written under qdisc spinlock */
0121     struct Qdisc            *next_sched;
0122     struct sk_buff_head skb_bad_txq;
0123 
0124     spinlock_t      busylock ____cacheline_aligned_in_smp;
0125     spinlock_t      seqlock;
0126 
0127     struct rcu_head     rcu;
0128     netdevice_tracker   dev_tracker;
0129     /* private data */
0130     long privdata[] ____cacheline_aligned;
0131 };
0132 
0133 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
0134 {
0135     if (qdisc->flags & TCQ_F_BUILTIN)
0136         return;
0137     refcount_inc(&qdisc->refcnt);
0138 }
0139 
0140 /* Intended to be used by unlocked users, when concurrent qdisc release is
0141  * possible.
0142  */
0143 
0144 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
0145 {
0146     if (qdisc->flags & TCQ_F_BUILTIN)
0147         return qdisc;
0148     if (refcount_inc_not_zero(&qdisc->refcnt))
0149         return qdisc;
0150     return NULL;
0151 }
0152 
0153 /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc
0154  * root_lock section, or provide their own memory barriers -- ordering
0155  * against qdisc_run_begin/end() atomic bit operations.
0156  */
0157 static inline bool qdisc_is_running(struct Qdisc *qdisc)
0158 {
0159     if (qdisc->flags & TCQ_F_NOLOCK)
0160         return spin_is_locked(&qdisc->seqlock);
0161     return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
0162 }
0163 
0164 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
0165 {
0166     return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY);
0167 }
0168 
0169 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
0170 {
0171     return q->flags & TCQ_F_CPUSTATS;
0172 }
0173 
0174 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
0175 {
0176     if (qdisc_is_percpu_stats(qdisc))
0177         return nolock_qdisc_is_empty(qdisc);
0178     return !READ_ONCE(qdisc->q.qlen);
0179 }
0180 
0181 /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with
0182  * the qdisc root lock acquired.
0183  */
0184 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
0185 {
0186     if (qdisc->flags & TCQ_F_NOLOCK) {
0187         if (spin_trylock(&qdisc->seqlock))
0188             return true;
0189 
0190         /* No need to insist if the MISSED flag was already set.
0191          * Note that test_and_set_bit() also gives us memory ordering
0192          * guarantees wrt potential earlier enqueue() and below
0193          * spin_trylock(), both of which are necessary to prevent races
0194          */
0195         if (test_and_set_bit(__QDISC_STATE_MISSED, &qdisc->state))
0196             return false;
0197 
0198         /* Try to take the lock again to make sure that we will either
0199          * grab it or the CPU that still has it will see MISSED set
0200          * when testing it in qdisc_run_end()
0201          */
0202         return spin_trylock(&qdisc->seqlock);
0203     }
0204     return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
0205 }
0206 
0207 static inline void qdisc_run_end(struct Qdisc *qdisc)
0208 {
0209     if (qdisc->flags & TCQ_F_NOLOCK) {
0210         spin_unlock(&qdisc->seqlock);
0211 
0212         /* spin_unlock() only has store-release semantic. The unlock
0213          * and test_bit() ordering is a store-load ordering, so a full
0214          * memory barrier is needed here.
0215          */
0216         smp_mb();
0217 
0218         if (unlikely(test_bit(__QDISC_STATE_MISSED,
0219                       &qdisc->state)))
0220             __netif_schedule(qdisc);
0221     } else {
0222         __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2);
0223     }
0224 }
0225 
0226 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
0227 {
0228     return qdisc->flags & TCQ_F_ONETXQUEUE;
0229 }
0230 
0231 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
0232 {
0233 #ifdef CONFIG_BQL
0234     /* Non-BQL migrated drivers will return 0, too. */
0235     return dql_avail(&txq->dql);
0236 #else
0237     return 0;
0238 #endif
0239 }
0240 
0241 struct Qdisc_class_ops {
0242     unsigned int        flags;
0243     /* Child qdisc manipulation */
0244     struct netdev_queue *   (*select_queue)(struct Qdisc *, struct tcmsg *);
0245     int         (*graft)(struct Qdisc *, unsigned long cl,
0246                     struct Qdisc *, struct Qdisc **,
0247                     struct netlink_ext_ack *extack);
0248     struct Qdisc *      (*leaf)(struct Qdisc *, unsigned long cl);
0249     void            (*qlen_notify)(struct Qdisc *, unsigned long);
0250 
0251     /* Class manipulation routines */
0252     unsigned long       (*find)(struct Qdisc *, u32 classid);
0253     int         (*change)(struct Qdisc *, u32, u32,
0254                     struct nlattr **, unsigned long *,
0255                     struct netlink_ext_ack *);
0256     int         (*delete)(struct Qdisc *, unsigned long,
0257                       struct netlink_ext_ack *);
0258     void            (*walk)(struct Qdisc *, struct qdisc_walker * arg);
0259 
0260     /* Filter manipulation */
0261     struct tcf_block *  (*tcf_block)(struct Qdisc *sch,
0262                          unsigned long arg,
0263                          struct netlink_ext_ack *extack);
0264     unsigned long       (*bind_tcf)(struct Qdisc *, unsigned long,
0265                     u32 classid);
0266     void            (*unbind_tcf)(struct Qdisc *, unsigned long);
0267 
0268     /* rtnetlink specific */
0269     int         (*dump)(struct Qdisc *, unsigned long,
0270                     struct sk_buff *skb, struct tcmsg*);
0271     int         (*dump_stats)(struct Qdisc *, unsigned long,
0272                     struct gnet_dump *);
0273 };
0274 
0275 /* Qdisc_class_ops flag values */
0276 
0277 /* Implements API that doesn't require rtnl lock */
0278 enum qdisc_class_ops_flags {
0279     QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
0280 };
0281 
0282 struct Qdisc_ops {
0283     struct Qdisc_ops    *next;
0284     const struct Qdisc_class_ops    *cl_ops;
0285     char            id[IFNAMSIZ];
0286     int         priv_size;
0287     unsigned int        static_flags;
0288 
0289     int             (*enqueue)(struct sk_buff *skb,
0290                        struct Qdisc *sch,
0291                        struct sk_buff **to_free);
0292     struct sk_buff *    (*dequeue)(struct Qdisc *);
0293     struct sk_buff *    (*peek)(struct Qdisc *);
0294 
0295     int         (*init)(struct Qdisc *sch, struct nlattr *arg,
0296                     struct netlink_ext_ack *extack);
0297     void            (*reset)(struct Qdisc *);
0298     void            (*destroy)(struct Qdisc *);
0299     int         (*change)(struct Qdisc *sch,
0300                       struct nlattr *arg,
0301                       struct netlink_ext_ack *extack);
0302     void            (*attach)(struct Qdisc *sch);
0303     int         (*change_tx_queue_len)(struct Qdisc *, unsigned int);
0304     void            (*change_real_num_tx)(struct Qdisc *sch,
0305                               unsigned int new_real_tx);
0306 
0307     int         (*dump)(struct Qdisc *, struct sk_buff *);
0308     int         (*dump_stats)(struct Qdisc *, struct gnet_dump *);
0309 
0310     void            (*ingress_block_set)(struct Qdisc *sch,
0311                              u32 block_index);
0312     void            (*egress_block_set)(struct Qdisc *sch,
0313                             u32 block_index);
0314     u32         (*ingress_block_get)(struct Qdisc *sch);
0315     u32         (*egress_block_get)(struct Qdisc *sch);
0316 
0317     struct module       *owner;
0318 };
0319 
0320 
0321 struct tcf_result {
0322     union {
0323         struct {
0324             unsigned long   class;
0325             u32     classid;
0326         };
0327         const struct tcf_proto *goto_tp;
0328 
0329         /* used in the skb_tc_reinsert function */
0330         struct {
0331             bool        ingress;
0332             struct gnet_stats_queue *qstats;
0333         };
0334     };
0335 };
0336 
0337 struct tcf_chain;
0338 
0339 struct tcf_proto_ops {
0340     struct list_head    head;
0341     char            kind[IFNAMSIZ];
0342 
0343     int         (*classify)(struct sk_buff *,
0344                         const struct tcf_proto *,
0345                         struct tcf_result *);
0346     int         (*init)(struct tcf_proto*);
0347     void            (*destroy)(struct tcf_proto *tp, bool rtnl_held,
0348                        struct netlink_ext_ack *extack);
0349 
0350     void*           (*get)(struct tcf_proto*, u32 handle);
0351     void            (*put)(struct tcf_proto *tp, void *f);
0352     int         (*change)(struct net *net, struct sk_buff *,
0353                     struct tcf_proto*, unsigned long,
0354                     u32 handle, struct nlattr **,
0355                     void **, u32,
0356                     struct netlink_ext_ack *);
0357     int         (*delete)(struct tcf_proto *tp, void *arg,
0358                       bool *last, bool rtnl_held,
0359                       struct netlink_ext_ack *);
0360     bool            (*delete_empty)(struct tcf_proto *tp);
0361     void            (*walk)(struct tcf_proto *tp,
0362                     struct tcf_walker *arg, bool rtnl_held);
0363     int         (*reoffload)(struct tcf_proto *tp, bool add,
0364                          flow_setup_cb_t *cb, void *cb_priv,
0365                          struct netlink_ext_ack *extack);
0366     void            (*hw_add)(struct tcf_proto *tp,
0367                       void *type_data);
0368     void            (*hw_del)(struct tcf_proto *tp,
0369                       void *type_data);
0370     void            (*bind_class)(void *, u32, unsigned long,
0371                           void *, unsigned long);
0372     void *          (*tmplt_create)(struct net *net,
0373                         struct tcf_chain *chain,
0374                         struct nlattr **tca,
0375                         struct netlink_ext_ack *extack);
0376     void            (*tmplt_destroy)(void *tmplt_priv);
0377 
0378     /* rtnetlink specific */
0379     int         (*dump)(struct net*, struct tcf_proto*, void *,
0380                     struct sk_buff *skb, struct tcmsg*,
0381                     bool);
0382     int         (*terse_dump)(struct net *net,
0383                           struct tcf_proto *tp, void *fh,
0384                           struct sk_buff *skb,
0385                           struct tcmsg *t, bool rtnl_held);
0386     int         (*tmplt_dump)(struct sk_buff *skb,
0387                           struct net *net,
0388                           void *tmplt_priv);
0389 
0390     struct module       *owner;
0391     int         flags;
0392 };
0393 
0394 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
0395  * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
0396  * conditions can occur when filters are inserted/deleted simultaneously.
0397  */
0398 enum tcf_proto_ops_flags {
0399     TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
0400 };
0401 
0402 struct tcf_proto {
0403     /* Fast access part */
0404     struct tcf_proto __rcu  *next;
0405     void __rcu      *root;
0406 
0407     /* called under RCU BH lock*/
0408     int         (*classify)(struct sk_buff *,
0409                         const struct tcf_proto *,
0410                         struct tcf_result *);
0411     __be16          protocol;
0412 
0413     /* All the rest */
0414     u32         prio;
0415     void            *data;
0416     const struct tcf_proto_ops  *ops;
0417     struct tcf_chain    *chain;
0418     /* Lock protects tcf_proto shared state and can be used by unlocked
0419      * classifiers to protect their private data.
0420      */
0421     spinlock_t      lock;
0422     bool            deleting;
0423     refcount_t      refcnt;
0424     struct rcu_head     rcu;
0425     struct hlist_node   destroy_ht_node;
0426 };
0427 
0428 struct qdisc_skb_cb {
0429     struct {
0430         unsigned int        pkt_len;
0431         u16         slave_dev_queue_mapping;
0432         u16         tc_classid;
0433     };
0434 #define QDISC_CB_PRIV_LEN 20
0435     unsigned char       data[QDISC_CB_PRIV_LEN];
0436 };
0437 
0438 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
0439 
0440 struct tcf_chain {
0441     /* Protects filter_chain. */
0442     struct mutex filter_chain_lock;
0443     struct tcf_proto __rcu *filter_chain;
0444     struct list_head list;
0445     struct tcf_block *block;
0446     u32 index; /* chain index */
0447     unsigned int refcnt;
0448     unsigned int action_refcnt;
0449     bool explicitly_created;
0450     bool flushing;
0451     const struct tcf_proto_ops *tmplt_ops;
0452     void *tmplt_priv;
0453     struct rcu_head rcu;
0454 };
0455 
0456 struct tcf_block {
0457     /* Lock protects tcf_block and lifetime-management data of chains
0458      * attached to the block (refcnt, action_refcnt, explicitly_created).
0459      */
0460     struct mutex lock;
0461     struct list_head chain_list;
0462     u32 index; /* block index for shared blocks */
0463     u32 classid; /* which class this block belongs to */
0464     refcount_t refcnt;
0465     struct net *net;
0466     struct Qdisc *q;
0467     struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
0468     struct flow_block flow_block;
0469     struct list_head owner_list;
0470     bool keep_dst;
0471     atomic_t offloadcnt; /* Number of oddloaded filters */
0472     unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
0473     unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
0474     struct {
0475         struct tcf_chain *chain;
0476         struct list_head filter_chain_list;
0477     } chain0;
0478     struct rcu_head rcu;
0479     DECLARE_HASHTABLE(proto_destroy_ht, 7);
0480     struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
0481 };
0482 
0483 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
0484 {
0485     return lockdep_is_held(&chain->filter_chain_lock);
0486 }
0487 
0488 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
0489 {
0490     return lockdep_is_held(&tp->lock);
0491 }
0492 
0493 #define tcf_chain_dereference(p, chain)                 \
0494     rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
0495 
0496 #define tcf_proto_dereference(p, tp)                    \
0497     rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
0498 
0499 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
0500 {
0501     struct qdisc_skb_cb *qcb;
0502 
0503     BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb));
0504     BUILD_BUG_ON(sizeof(qcb->data) < sz);
0505 }
0506 
0507 static inline int qdisc_qlen(const struct Qdisc *q)
0508 {
0509     return q->q.qlen;
0510 }
0511 
0512 static inline int qdisc_qlen_sum(const struct Qdisc *q)
0513 {
0514     __u32 qlen = q->qstats.qlen;
0515     int i;
0516 
0517     if (qdisc_is_percpu_stats(q)) {
0518         for_each_possible_cpu(i)
0519             qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
0520     } else {
0521         qlen += q->q.qlen;
0522     }
0523 
0524     return qlen;
0525 }
0526 
0527 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
0528 {
0529     return (struct qdisc_skb_cb *)skb->cb;
0530 }
0531 
0532 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
0533 {
0534     return &qdisc->q.lock;
0535 }
0536 
0537 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
0538 {
0539     struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
0540 
0541     return q;
0542 }
0543 
0544 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
0545 {
0546     return rcu_dereference_bh(qdisc->dev_queue->qdisc);
0547 }
0548 
0549 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
0550 {
0551     return qdisc->dev_queue->qdisc_sleeping;
0552 }
0553 
0554 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
0555 {
0556     struct Qdisc *root = qdisc_root_sleeping(qdisc);
0557 
0558     ASSERT_RTNL();
0559     return qdisc_lock(root);
0560 }
0561 
0562 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
0563 {
0564     return qdisc->dev_queue->dev;
0565 }
0566 
0567 static inline void sch_tree_lock(struct Qdisc *q)
0568 {
0569     if (q->flags & TCQ_F_MQROOT)
0570         spin_lock_bh(qdisc_lock(q));
0571     else
0572         spin_lock_bh(qdisc_root_sleeping_lock(q));
0573 }
0574 
0575 static inline void sch_tree_unlock(struct Qdisc *q)
0576 {
0577     if (q->flags & TCQ_F_MQROOT)
0578         spin_unlock_bh(qdisc_lock(q));
0579     else
0580         spin_unlock_bh(qdisc_root_sleeping_lock(q));
0581 }
0582 
0583 extern struct Qdisc noop_qdisc;
0584 extern struct Qdisc_ops noop_qdisc_ops;
0585 extern struct Qdisc_ops pfifo_fast_ops;
0586 extern struct Qdisc_ops mq_qdisc_ops;
0587 extern struct Qdisc_ops noqueue_qdisc_ops;
0588 extern const struct Qdisc_ops *default_qdisc_ops;
0589 static inline const struct Qdisc_ops *
0590 get_default_qdisc_ops(const struct net_device *dev, int ntx)
0591 {
0592     return ntx < dev->real_num_tx_queues ?
0593             default_qdisc_ops : &pfifo_fast_ops;
0594 }
0595 
0596 struct Qdisc_class_common {
0597     u32         classid;
0598     struct hlist_node   hnode;
0599 };
0600 
0601 struct Qdisc_class_hash {
0602     struct hlist_head   *hash;
0603     unsigned int        hashsize;
0604     unsigned int        hashmask;
0605     unsigned int        hashelems;
0606 };
0607 
0608 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
0609 {
0610     id ^= id >> 8;
0611     id ^= id >> 4;
0612     return id & mask;
0613 }
0614 
0615 static inline struct Qdisc_class_common *
0616 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
0617 {
0618     struct Qdisc_class_common *cl;
0619     unsigned int h;
0620 
0621     if (!id)
0622         return NULL;
0623 
0624     h = qdisc_class_hash(id, hash->hashmask);
0625     hlist_for_each_entry(cl, &hash->hash[h], hnode) {
0626         if (cl->classid == id)
0627             return cl;
0628     }
0629     return NULL;
0630 }
0631 
0632 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
0633 {
0634     u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
0635 
0636     return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
0637 }
0638 
0639 int qdisc_class_hash_init(struct Qdisc_class_hash *);
0640 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
0641                  struct Qdisc_class_common *);
0642 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
0643                  struct Qdisc_class_common *);
0644 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
0645 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
0646 
0647 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
0648 void dev_qdisc_change_real_num_tx(struct net_device *dev,
0649                   unsigned int new_real_tx);
0650 void dev_init_scheduler(struct net_device *dev);
0651 void dev_shutdown(struct net_device *dev);
0652 void dev_activate(struct net_device *dev);
0653 void dev_deactivate(struct net_device *dev);
0654 void dev_deactivate_many(struct list_head *head);
0655 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
0656                   struct Qdisc *qdisc);
0657 void qdisc_reset(struct Qdisc *qdisc);
0658 void qdisc_put(struct Qdisc *qdisc);
0659 void qdisc_put_unlocked(struct Qdisc *qdisc);
0660 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
0661 #ifdef CONFIG_NET_SCHED
0662 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
0663                   void *type_data);
0664 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
0665                 struct Qdisc *new, struct Qdisc *old,
0666                 enum tc_setup_type type, void *type_data,
0667                 struct netlink_ext_ack *extack);
0668 #else
0669 static inline int
0670 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
0671               void *type_data)
0672 {
0673     q->flags &= ~TCQ_F_OFFLOADED;
0674     return 0;
0675 }
0676 
0677 static inline void
0678 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
0679                struct Qdisc *new, struct Qdisc *old,
0680                enum tc_setup_type type, void *type_data,
0681                struct netlink_ext_ack *extack)
0682 {
0683 }
0684 #endif
0685 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
0686               const struct Qdisc_ops *ops,
0687               struct netlink_ext_ack *extack);
0688 void qdisc_free(struct Qdisc *qdisc);
0689 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
0690                 const struct Qdisc_ops *ops, u32 parentid,
0691                 struct netlink_ext_ack *extack);
0692 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
0693                    const struct qdisc_size_table *stab);
0694 int skb_do_redirect(struct sk_buff *);
0695 
0696 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
0697 {
0698 #ifdef CONFIG_NET_CLS_ACT
0699     return skb->tc_at_ingress;
0700 #else
0701     return false;
0702 #endif
0703 }
0704 
0705 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
0706 {
0707 #ifdef CONFIG_NET_CLS_ACT
0708     if (skb->tc_skip_classify) {
0709         skb->tc_skip_classify = 0;
0710         return true;
0711     }
0712 #endif
0713     return false;
0714 }
0715 
0716 /* Reset all TX qdiscs greater than index of a device.  */
0717 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
0718 {
0719     struct Qdisc *qdisc;
0720 
0721     for (; i < dev->num_tx_queues; i++) {
0722         qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
0723         if (qdisc) {
0724             spin_lock_bh(qdisc_lock(qdisc));
0725             qdisc_reset(qdisc);
0726             spin_unlock_bh(qdisc_lock(qdisc));
0727         }
0728     }
0729 }
0730 
0731 /* Are all TX queues of the device empty?  */
0732 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
0733 {
0734     unsigned int i;
0735 
0736     rcu_read_lock();
0737     for (i = 0; i < dev->num_tx_queues; i++) {
0738         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
0739         const struct Qdisc *q = rcu_dereference(txq->qdisc);
0740 
0741         if (!qdisc_is_empty(q)) {
0742             rcu_read_unlock();
0743             return false;
0744         }
0745     }
0746     rcu_read_unlock();
0747     return true;
0748 }
0749 
0750 /* Are any of the TX qdiscs changing?  */
0751 static inline bool qdisc_tx_changing(const struct net_device *dev)
0752 {
0753     unsigned int i;
0754 
0755     for (i = 0; i < dev->num_tx_queues; i++) {
0756         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
0757         if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
0758             return true;
0759     }
0760     return false;
0761 }
0762 
0763 /* Is the device using the noop qdisc on all queues?  */
0764 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
0765 {
0766     unsigned int i;
0767 
0768     for (i = 0; i < dev->num_tx_queues; i++) {
0769         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
0770         if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
0771             return false;
0772     }
0773     return true;
0774 }
0775 
0776 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
0777 {
0778     return qdisc_skb_cb(skb)->pkt_len;
0779 }
0780 
0781 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
0782 enum net_xmit_qdisc_t {
0783     __NET_XMIT_STOLEN = 0x00010000,
0784     __NET_XMIT_BYPASS = 0x00020000,
0785 };
0786 
0787 #ifdef CONFIG_NET_CLS_ACT
0788 #define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
0789 #else
0790 #define net_xmit_drop_count(e)  (1)
0791 #endif
0792 
0793 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
0794                        const struct Qdisc *sch)
0795 {
0796 #ifdef CONFIG_NET_SCHED
0797     struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
0798 
0799     if (stab)
0800         __qdisc_calculate_pkt_len(skb, stab);
0801 #endif
0802 }
0803 
0804 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
0805                 struct sk_buff **to_free)
0806 {
0807     qdisc_calculate_pkt_len(skb, sch);
0808     return sch->enqueue(skb, sch, to_free);
0809 }
0810 
0811 static inline void _bstats_update(struct gnet_stats_basic_sync *bstats,
0812                   __u64 bytes, __u32 packets)
0813 {
0814     u64_stats_update_begin(&bstats->syncp);
0815     u64_stats_add(&bstats->bytes, bytes);
0816     u64_stats_add(&bstats->packets, packets);
0817     u64_stats_update_end(&bstats->syncp);
0818 }
0819 
0820 static inline void bstats_update(struct gnet_stats_basic_sync *bstats,
0821                  const struct sk_buff *skb)
0822 {
0823     _bstats_update(bstats,
0824                qdisc_pkt_len(skb),
0825                skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
0826 }
0827 
0828 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
0829                        const struct sk_buff *skb)
0830 {
0831     bstats_update(this_cpu_ptr(sch->cpu_bstats), skb);
0832 }
0833 
0834 static inline void qdisc_bstats_update(struct Qdisc *sch,
0835                        const struct sk_buff *skb)
0836 {
0837     bstats_update(&sch->bstats, skb);
0838 }
0839 
0840 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
0841                         const struct sk_buff *skb)
0842 {
0843     sch->qstats.backlog -= qdisc_pkt_len(skb);
0844 }
0845 
0846 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
0847                         const struct sk_buff *skb)
0848 {
0849     this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
0850 }
0851 
0852 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
0853                         const struct sk_buff *skb)
0854 {
0855     sch->qstats.backlog += qdisc_pkt_len(skb);
0856 }
0857 
0858 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
0859                         const struct sk_buff *skb)
0860 {
0861     this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
0862 }
0863 
0864 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
0865 {
0866     this_cpu_inc(sch->cpu_qstats->qlen);
0867 }
0868 
0869 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
0870 {
0871     this_cpu_dec(sch->cpu_qstats->qlen);
0872 }
0873 
0874 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
0875 {
0876     this_cpu_inc(sch->cpu_qstats->requeues);
0877 }
0878 
0879 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
0880 {
0881     sch->qstats.drops += count;
0882 }
0883 
0884 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
0885 {
0886     qstats->drops++;
0887 }
0888 
0889 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
0890 {
0891     qstats->overlimits++;
0892 }
0893 
0894 static inline void qdisc_qstats_drop(struct Qdisc *sch)
0895 {
0896     qstats_drop_inc(&sch->qstats);
0897 }
0898 
0899 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
0900 {
0901     this_cpu_inc(sch->cpu_qstats->drops);
0902 }
0903 
0904 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
0905 {
0906     sch->qstats.overlimits++;
0907 }
0908 
0909 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
0910 {
0911     __u32 qlen = qdisc_qlen_sum(sch);
0912 
0913     return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
0914 }
0915 
0916 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch,  __u32 *qlen,
0917                          __u32 *backlog)
0918 {
0919     struct gnet_stats_queue qstats = { 0 };
0920 
0921     gnet_stats_add_queue(&qstats, sch->cpu_qstats, &sch->qstats);
0922     *qlen = qstats.qlen + qdisc_qlen(sch);
0923     *backlog = qstats.backlog;
0924 }
0925 
0926 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
0927 {
0928     __u32 qlen, backlog;
0929 
0930     qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
0931     qdisc_tree_reduce_backlog(sch, qlen, backlog);
0932 }
0933 
0934 static inline void qdisc_purge_queue(struct Qdisc *sch)
0935 {
0936     __u32 qlen, backlog;
0937 
0938     qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
0939     qdisc_reset(sch);
0940     qdisc_tree_reduce_backlog(sch, qlen, backlog);
0941 }
0942 
0943 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
0944 {
0945     qh->head = NULL;
0946     qh->tail = NULL;
0947     qh->qlen = 0;
0948 }
0949 
0950 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
0951                     struct qdisc_skb_head *qh)
0952 {
0953     struct sk_buff *last = qh->tail;
0954 
0955     if (last) {
0956         skb->next = NULL;
0957         last->next = skb;
0958         qh->tail = skb;
0959     } else {
0960         qh->tail = skb;
0961         qh->head = skb;
0962     }
0963     qh->qlen++;
0964 }
0965 
0966 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
0967 {
0968     __qdisc_enqueue_tail(skb, &sch->q);
0969     qdisc_qstats_backlog_inc(sch, skb);
0970     return NET_XMIT_SUCCESS;
0971 }
0972 
0973 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
0974                     struct qdisc_skb_head *qh)
0975 {
0976     skb->next = qh->head;
0977 
0978     if (!qh->head)
0979         qh->tail = skb;
0980     qh->head = skb;
0981     qh->qlen++;
0982 }
0983 
0984 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
0985 {
0986     struct sk_buff *skb = qh->head;
0987 
0988     if (likely(skb != NULL)) {
0989         qh->head = skb->next;
0990         qh->qlen--;
0991         if (qh->head == NULL)
0992             qh->tail = NULL;
0993         skb->next = NULL;
0994     }
0995 
0996     return skb;
0997 }
0998 
0999 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1000 {
1001     struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1002 
1003     if (likely(skb != NULL)) {
1004         qdisc_qstats_backlog_dec(sch, skb);
1005         qdisc_bstats_update(sch, skb);
1006     }
1007 
1008     return skb;
1009 }
1010 
1011 /* Instead of calling kfree_skb() while root qdisc lock is held,
1012  * queue the skb for future freeing at end of __dev_xmit_skb()
1013  */
1014 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1015 {
1016     skb->next = *to_free;
1017     *to_free = skb;
1018 }
1019 
1020 static inline void __qdisc_drop_all(struct sk_buff *skb,
1021                     struct sk_buff **to_free)
1022 {
1023     if (skb->prev)
1024         skb->prev->next = *to_free;
1025     else
1026         skb->next = *to_free;
1027     *to_free = skb;
1028 }
1029 
1030 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1031                            struct qdisc_skb_head *qh,
1032                            struct sk_buff **to_free)
1033 {
1034     struct sk_buff *skb = __qdisc_dequeue_head(qh);
1035 
1036     if (likely(skb != NULL)) {
1037         unsigned int len = qdisc_pkt_len(skb);
1038 
1039         qdisc_qstats_backlog_dec(sch, skb);
1040         __qdisc_drop(skb, to_free);
1041         return len;
1042     }
1043 
1044     return 0;
1045 }
1046 
1047 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1048 {
1049     const struct qdisc_skb_head *qh = &sch->q;
1050 
1051     return qh->head;
1052 }
1053 
1054 /* generic pseudo peek method for non-work-conserving qdisc */
1055 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1056 {
1057     struct sk_buff *skb = skb_peek(&sch->gso_skb);
1058 
1059     /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1060     if (!skb) {
1061         skb = sch->dequeue(sch);
1062 
1063         if (skb) {
1064             __skb_queue_head(&sch->gso_skb, skb);
1065             /* it's still part of the queue */
1066             qdisc_qstats_backlog_inc(sch, skb);
1067             sch->q.qlen++;
1068         }
1069     }
1070 
1071     return skb;
1072 }
1073 
1074 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1075                          struct sk_buff *skb)
1076 {
1077     if (qdisc_is_percpu_stats(sch)) {
1078         qdisc_qstats_cpu_backlog_dec(sch, skb);
1079         qdisc_bstats_cpu_update(sch, skb);
1080         qdisc_qstats_cpu_qlen_dec(sch);
1081     } else {
1082         qdisc_qstats_backlog_dec(sch, skb);
1083         qdisc_bstats_update(sch, skb);
1084         sch->q.qlen--;
1085     }
1086 }
1087 
1088 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1089                          unsigned int pkt_len)
1090 {
1091     if (qdisc_is_percpu_stats(sch)) {
1092         qdisc_qstats_cpu_qlen_inc(sch);
1093         this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1094     } else {
1095         sch->qstats.backlog += pkt_len;
1096         sch->q.qlen++;
1097     }
1098 }
1099 
1100 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1101 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1102 {
1103     struct sk_buff *skb = skb_peek(&sch->gso_skb);
1104 
1105     if (skb) {
1106         skb = __skb_dequeue(&sch->gso_skb);
1107         if (qdisc_is_percpu_stats(sch)) {
1108             qdisc_qstats_cpu_backlog_dec(sch, skb);
1109             qdisc_qstats_cpu_qlen_dec(sch);
1110         } else {
1111             qdisc_qstats_backlog_dec(sch, skb);
1112             sch->q.qlen--;
1113         }
1114     } else {
1115         skb = sch->dequeue(sch);
1116     }
1117 
1118     return skb;
1119 }
1120 
1121 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1122 {
1123     /*
1124      * We do not know the backlog in bytes of this list, it
1125      * is up to the caller to correct it
1126      */
1127     ASSERT_RTNL();
1128     if (qh->qlen) {
1129         rtnl_kfree_skbs(qh->head, qh->tail);
1130 
1131         qh->head = NULL;
1132         qh->tail = NULL;
1133         qh->qlen = 0;
1134     }
1135 }
1136 
1137 static inline void qdisc_reset_queue(struct Qdisc *sch)
1138 {
1139     __qdisc_reset_queue(&sch->q);
1140     sch->qstats.backlog = 0;
1141 }
1142 
1143 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1144                       struct Qdisc **pold)
1145 {
1146     struct Qdisc *old;
1147 
1148     sch_tree_lock(sch);
1149     old = *pold;
1150     *pold = new;
1151     if (old != NULL)
1152         qdisc_purge_queue(old);
1153     sch_tree_unlock(sch);
1154 
1155     return old;
1156 }
1157 
1158 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1159 {
1160     rtnl_kfree_skbs(skb, skb);
1161     qdisc_qstats_drop(sch);
1162 }
1163 
1164 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1165                  struct sk_buff **to_free)
1166 {
1167     __qdisc_drop(skb, to_free);
1168     qdisc_qstats_cpu_drop(sch);
1169 
1170     return NET_XMIT_DROP;
1171 }
1172 
1173 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1174                  struct sk_buff **to_free)
1175 {
1176     __qdisc_drop(skb, to_free);
1177     qdisc_qstats_drop(sch);
1178 
1179     return NET_XMIT_DROP;
1180 }
1181 
1182 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1183                  struct sk_buff **to_free)
1184 {
1185     __qdisc_drop_all(skb, to_free);
1186     qdisc_qstats_drop(sch);
1187 
1188     return NET_XMIT_DROP;
1189 }
1190 
1191 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1192    long it will take to send a packet given its size.
1193  */
1194 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1195 {
1196     int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1197     if (slot < 0)
1198         slot = 0;
1199     slot >>= rtab->rate.cell_log;
1200     if (slot > 255)
1201         return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1202     return rtab->data[slot];
1203 }
1204 
1205 struct psched_ratecfg {
1206     u64 rate_bytes_ps; /* bytes per second */
1207     u32 mult;
1208     u16 overhead;
1209     u16 mpu;
1210     u8  linklayer;
1211     u8  shift;
1212 };
1213 
1214 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1215                 unsigned int len)
1216 {
1217     len += r->overhead;
1218 
1219     if (len < r->mpu)
1220         len = r->mpu;
1221 
1222     if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1223         return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1224 
1225     return ((u64)len * r->mult) >> r->shift;
1226 }
1227 
1228 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1229                    const struct tc_ratespec *conf,
1230                    u64 rate64);
1231 
1232 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1233                       const struct psched_ratecfg *r)
1234 {
1235     memset(res, 0, sizeof(*res));
1236 
1237     /* legacy struct tc_ratespec has a 32bit @rate field
1238      * Qdisc using 64bit rate should add new attributes
1239      * in order to maintain compatibility.
1240      */
1241     res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1242 
1243     res->overhead = r->overhead;
1244     res->mpu = r->mpu;
1245     res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1246 }
1247 
1248 struct psched_pktrate {
1249     u64 rate_pkts_ps; /* packets per second */
1250     u32 mult;
1251     u8  shift;
1252 };
1253 
1254 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r,
1255                   unsigned int pkt_num)
1256 {
1257     return ((u64)pkt_num * r->mult) >> r->shift;
1258 }
1259 
1260 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64);
1261 
1262 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1263  * The fast path only needs to access filter list and to update stats
1264  */
1265 struct mini_Qdisc {
1266     struct tcf_proto *filter_list;
1267     struct tcf_block *block;
1268     struct gnet_stats_basic_sync __percpu *cpu_bstats;
1269     struct gnet_stats_queue __percpu *cpu_qstats;
1270     unsigned long rcu_state;
1271 };
1272 
1273 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1274                         const struct sk_buff *skb)
1275 {
1276     bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1277 }
1278 
1279 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1280 {
1281     this_cpu_inc(miniq->cpu_qstats->drops);
1282 }
1283 
1284 struct mini_Qdisc_pair {
1285     struct mini_Qdisc miniq1;
1286     struct mini_Qdisc miniq2;
1287     struct mini_Qdisc __rcu **p_miniq;
1288 };
1289 
1290 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1291               struct tcf_proto *tp_head);
1292 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1293               struct mini_Qdisc __rcu **p_miniq);
1294 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1295                 struct tcf_block *block);
1296 
1297 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx);
1298 
1299 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb));
1300 
1301 #endif
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