#ifndef __NET_SCHED_GENERIC_H #define __NET_SCHED_GENERIC_H #include #include #include #include #include #include #include #include #include struct Qdisc_ops; struct qdisc_walker; struct tcf_walker; struct module; 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_THROTTLED, }; /* * following bits are only changed while qdisc lock is held */ enum qdisc___state_t { __QDISC___STATE_RUNNING = 1, }; struct qdisc_size_table { struct rcu_head rcu; struct list_head list; struct tc_sizespec szopts; int refcnt; u16 data[]; }; struct Qdisc { int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev); struct sk_buff * (*dequeue)(struct Qdisc *dev); 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_NSS 0x1000 /* NSS qdisc flag. */ u32 limit; const struct Qdisc_ops *ops; struct qdisc_size_table __rcu *stab; struct list_head list; u32 handle; u32 parent; int (*reshape_fail)(struct sk_buff *skb, struct Qdisc *q); void *u32_node; /* This field is deprecated, but it is still used by CBQ * and it will live until better solution will be invented. */ struct Qdisc *__parent; struct netdev_queue *dev_queue; struct gnet_stats_rate_est64 rate_est; struct gnet_stats_basic_cpu __percpu *cpu_bstats; struct gnet_stats_queue __percpu *cpu_qstats; struct Qdisc *next_sched; struct sk_buff *gso_skb; /* * For performance sake on SMP, we put highly modified fields at the end */ unsigned long state; struct sk_buff_head q; struct gnet_stats_basic_packed bstats; unsigned int __state; struct gnet_stats_queue qstats; struct rcu_head rcu_head; int padded; atomic_t refcnt; spinlock_t busylock ____cacheline_aligned_in_smp; }; static inline bool qdisc_is_running(const struct Qdisc *qdisc) { return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false; } static inline bool qdisc_run_begin(struct Qdisc *qdisc) { if (qdisc_is_running(qdisc)) return false; qdisc->__state |= __QDISC___STATE_RUNNING; return true; } static inline void qdisc_run_end(struct Qdisc *qdisc) { qdisc->__state &= ~__QDISC___STATE_RUNNING; } static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) { return qdisc->flags & TCQ_F_ONETXQUEUE; } static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) { #ifdef CONFIG_BQL /* Non-BQL migrated drivers will return 0, too. */ return dql_avail(&txq->dql); #else return 0; #endif } static inline bool qdisc_is_throttled(const struct Qdisc *qdisc) { return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false; } static inline void qdisc_throttled(struct Qdisc *qdisc) { set_bit(__QDISC_STATE_THROTTLED, &qdisc->state); } static inline void qdisc_unthrottled(struct Qdisc *qdisc) { clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state); } struct Qdisc_class_ops { /* Child qdisc manipulation */ struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); int (*graft)(struct Qdisc *, unsigned long cl, struct Qdisc *, struct Qdisc **); struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); void (*qlen_notify)(struct Qdisc *, unsigned long); /* Class manipulation routines */ unsigned long (*get)(struct Qdisc *, u32 classid); void (*put)(struct Qdisc *, unsigned long); int (*change)(struct Qdisc *, u32, u32, struct nlattr **, unsigned long *); int (*delete)(struct Qdisc *, unsigned long); void (*walk)(struct Qdisc *, struct qdisc_walker * arg); /* Filter manipulation */ struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long); unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, u32 classid); void (*unbind_tcf)(struct Qdisc *, unsigned long); /* rtnetlink specific */ int (*dump)(struct Qdisc *, unsigned long, struct sk_buff *skb, struct tcmsg*); int (*dump_stats)(struct Qdisc *, unsigned long, struct gnet_dump *); }; struct Qdisc_ops { struct Qdisc_ops *next; const struct Qdisc_class_ops *cl_ops; char id[IFNAMSIZ]; int priv_size; int (*enqueue)(struct sk_buff *, struct Qdisc *); struct sk_buff * (*dequeue)(struct Qdisc *); struct sk_buff * (*peek)(struct Qdisc *); unsigned int (*drop)(struct Qdisc *); int (*init)(struct Qdisc *, struct nlattr *arg); void (*reset)(struct Qdisc *); void (*destroy)(struct Qdisc *); int (*change)(struct Qdisc *, struct nlattr *arg); void (*attach)(struct Qdisc *); int (*dump)(struct Qdisc *, struct sk_buff *); int (*dump_stats)(struct Qdisc *, struct gnet_dump *); struct module *owner; }; struct tcf_result { unsigned long class; u32 classid; }; 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*); bool (*destroy)(struct tcf_proto*, bool); unsigned long (*get)(struct tcf_proto*, u32 handle); int (*change)(struct net *net, struct sk_buff *, struct tcf_proto*, unsigned long, u32 handle, struct nlattr **, unsigned long *, bool); int (*delete)(struct tcf_proto*, unsigned long); void (*walk)(struct tcf_proto*, struct tcf_walker *arg); /* rtnetlink specific */ int (*dump)(struct net*, struct tcf_proto*, unsigned long, struct sk_buff *skb, struct tcmsg*); struct module *owner; }; struct tcf_proto { /* Fast access part */ struct tcf_proto __rcu *next; void __rcu *root; int (*classify)(struct sk_buff *, const struct tcf_proto *, struct tcf_result *); __be16 protocol; /* All the rest */ u32 prio; u32 classid; struct Qdisc *q; void *data; const struct tcf_proto_ops *ops; struct rcu_head rcu; }; struct qdisc_skb_cb { unsigned int pkt_len; u16 slave_dev_queue_mapping; u16 tc_classid; #define QDISC_CB_PRIV_LEN 20 unsigned char data[QDISC_CB_PRIV_LEN]; }; static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) { struct qdisc_skb_cb *qcb; BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); BUILD_BUG_ON(sizeof(qcb->data) < sz); } static inline int qdisc_qlen(const struct Qdisc *q) { return q->q.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 qdisc->dev_queue->qdisc_sleeping; } /* The qdisc root lock is a mechanism by which to top level * of a qdisc tree can be locked from any qdisc node in the * forest. This allows changing the configuration of some * aspect of the qdisc tree while blocking out asynchronous * qdisc access in the packet processing paths. * * It is only legal to do this when the root will not change * on us. Otherwise we'll potentially lock the wrong qdisc * root. This is enforced by holding the RTNL semaphore, which * all users of this lock accessor must do. */ static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) { struct Qdisc *root = qdisc_root(qdisc); ASSERT_RTNL(); return qdisc_lock(root); } 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(const struct Qdisc *q) { spin_lock_bh(qdisc_root_sleeping_lock(q)); } static inline void sch_tree_unlock(const struct Qdisc *q) { spin_unlock_bh(qdisc_root_sleeping_lock(q)); } #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->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 struct Qdisc_ops fq_codel_qdisc_ops; extern const struct Qdisc_ops *default_qdisc_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; h = qdisc_class_hash(id, hash->hashmask); hlist_for_each_entry(cl, &hash->hash[h], hnode) { if (cl->classid == id) return cl; } return NULL; } 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 *); 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_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, unsigned int len); struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, const struct Qdisc_ops *ops); struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, const struct Qdisc_ops *ops, u32 parentid); void __qdisc_calculate_pkt_len(struct sk_buff *skb, const struct qdisc_size_table *stab); bool tcf_destroy(struct tcf_proto *tp, bool force); void tcf_destroy_chain(struct tcf_proto __rcu **fl); 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 G_TC_AT(skb->tc_verd) & AT_INGRESS; #else return false; #endif } /* Reset all TX qdiscs greater then index of a device. */ static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) { 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)); } } } static inline void qdisc_reset_all_tx(struct net_device *dev) { qdisc_reset_all_tx_gt(dev, 0); } /* 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 (q->q.qlen) { 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) != 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) { qdisc_calculate_pkt_len(skb, sch); return sch->enqueue(skb, sch); } static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) { return q->flags & TCQ_F_CPUSTATS; } static inline void bstats_update(struct gnet_stats_basic_packed *bstats, const struct sk_buff *skb) { bstats->bytes += qdisc_pkt_len(skb); bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1; } static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, const struct sk_buff *skb) { u64_stats_update_begin(&bstats->syncp); bstats_update(&bstats->bstats, skb); u64_stats_update_end(&bstats->syncp); } static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, const struct sk_buff *skb) { bstats_cpu_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_backlog_inc(struct Qdisc *sch, const struct sk_buff *skb) { sch->qstats.backlog += qdisc_pkt_len(skb); } static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) { sch->qstats.drops += count; } static inline void 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) { qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats)); } static inline void qdisc_qstats_overlimit(struct Qdisc *sch) { sch->qstats.overlimits++; } static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, struct sk_buff_head *list) { __skb_queue_tail(list, skb); qdisc_qstats_backlog_inc(sch, skb); return NET_XMIT_SUCCESS; } static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) { return __qdisc_enqueue_tail(skb, sch, &sch->q); } static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, struct sk_buff_head *list) { struct sk_buff *skb = __skb_dequeue(list); if (likely(skb != NULL)) { qdisc_qstats_backlog_dec(sch, skb); qdisc_bstats_update(sch, skb); } return skb; } static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) { return __qdisc_dequeue_head(sch, &sch->q); } static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, struct sk_buff_head *list) { struct sk_buff *skb = __skb_dequeue(list); if (likely(skb != NULL)) { unsigned int len = qdisc_pkt_len(skb); qdisc_qstats_backlog_dec(sch, skb); kfree_skb(skb); return len; } return 0; } static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) { return __qdisc_queue_drop_head(sch, &sch->q); } static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, struct sk_buff_head *list) { struct sk_buff *skb = __skb_dequeue_tail(list); if (likely(skb != NULL)) qdisc_qstats_backlog_dec(sch, skb); return skb; } static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) { return __qdisc_dequeue_tail(sch, &sch->q); } static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) { return skb_peek(&sch->q); } /* generic pseudo peek method for non-work-conserving qdisc */ static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) { /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ if (!sch->gso_skb) { sch->gso_skb = sch->dequeue(sch); if (sch->gso_skb) { /* it's still part of the queue */ qdisc_qstats_backlog_inc(sch, sch->gso_skb); sch->q.qlen++; } } return sch->gso_skb; } /* 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 = sch->gso_skb; if (skb) { sch->gso_skb = NULL; qdisc_qstats_backlog_dec(sch, skb); sch->q.qlen--; } else { skb = sch->dequeue(sch); } return skb; } static inline void __qdisc_reset_queue(struct Qdisc *sch, struct sk_buff_head *list) { /* * We do not know the backlog in bytes of this list, it * is up to the caller to correct it */ __skb_queue_purge(list); } static inline void qdisc_reset_queue(struct Qdisc *sch) { __qdisc_reset_queue(sch, &sch->q); sch->qstats.backlog = 0; } 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) { unsigned int qlen = old->q.qlen; unsigned int backlog = old->qstats.backlog; qdisc_reset(old); qdisc_tree_reduce_backlog(old, qlen, backlog); } sch_tree_unlock(sch); return old; } static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, struct sk_buff_head *list) { struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); if (likely(skb != NULL)) { unsigned int len = qdisc_pkt_len(skb); kfree_skb(skb); return len; } return 0; } static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) { return __qdisc_queue_drop(sch, &sch->q); } static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) { kfree_skb(skb); qdisc_qstats_drop(sch); return NET_XMIT_DROP; } static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) { qdisc_qstats_drop(sch); #ifdef CONFIG_NET_CLS_ACT if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) goto drop; return NET_XMIT_SUCCESS; drop: #endif kfree_skb(skb); 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; u8 linklayer; u8 shift; }; static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, unsigned int len) { len += r->overhead; 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->linklayer = (r->linklayer & TC_LINKLAYER_MASK); } #endif