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- /* 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 <linux/android_kabi.h>
- #include <net/gen_stats.h>
- #include <net/rtnetlink.h>
- #include <net/flow_offload.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;
- ANDROID_KABI_RESERVE(1);
- /* 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 *);
- ANDROID_KABI_RESERVE(1);
- };
- /* 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;
- ANDROID_KABI_RESERVE(1);
- };
- 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);
- /* 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 {
- /* 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. */
- };
- 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 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;
- 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 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_CLS_ACT
- 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;
- }
- /* 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;
- }
- /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
- long it will take to send a packet given its size.
- */
- static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
- {
- int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
- if (slot < 0)
- slot = 0;
- slot >>= rtab->rate.cell_log;
- if (slot > 255)
- return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
- return rtab->data[slot];
- }
- 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
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