From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- include/net/sch_generic.h | 670 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 670 insertions(+) create mode 100644 include/net/sch_generic.h (limited to 'include/net/sch_generic.h') diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h new file mode 100644 index 00000000..f1fbe2d5 --- /dev/null +++ b/include/net/sch_generic.h @@ -0,0 +1,670 @@ +#ifndef __NET_SCHED_GENERIC_H +#define __NET_SCHED_GENERIC_H + +#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 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_WARN_NONWC (1 << 16) + int padded; + struct Qdisc_ops *ops; + struct qdisc_size_table __rcu *stab; + struct list_head list; + u32 handle; + u32 parent; + atomic_t refcnt; + struct gnet_stats_rate_est rate_est; + 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 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; + spinlock_t busylock; + u32 limit; +}; + +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_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 ** (*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 tcf_proto_ops *next; + char kind[IFNAMSIZ]; + + int (*classify)(struct sk_buff*, struct tcf_proto*, + struct tcf_result *); + int (*init)(struct tcf_proto*); + void (*destroy)(struct tcf_proto*); + + unsigned long (*get)(struct tcf_proto*, u32 handle); + void (*put)(struct tcf_proto*, unsigned long); + int (*change)(struct tcf_proto*, unsigned long, + u32 handle, struct nlattr **, + unsigned long *); + int (*delete)(struct tcf_proto*, unsigned long); + void (*walk)(struct tcf_proto*, struct tcf_walker *arg); + + /* rtnetlink specific */ + int (*dump)(struct tcf_proto*, unsigned long, + struct sk_buff *skb, struct tcmsg*); + + struct module *owner; +}; + +struct tcf_proto { + /* Fast access part */ + struct tcf_proto *next; + void *root; + int (*classify)(struct sk_buff*, struct tcf_proto*, + struct tcf_result *); + __be16 protocol; + + /* All the rest */ + u32 prio; + u32 classid; + struct Qdisc *q; + void *data; + struct tcf_proto_ops *ops; +}; + +struct qdisc_skb_cb { + unsigned int pkt_len; + unsigned char data[24]; +}; + +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(unsigned int) + sz); + BUILD_BUG_ON(sizeof(qcb->data) < sz); +} + +static inline int qdisc_qlen(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(struct Qdisc *qdisc) +{ + return qdisc->dev_queue->qdisc; +} + +static inline struct Qdisc *qdisc_root_sleeping(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(struct Qdisc *qdisc) +{ + struct Qdisc *root = qdisc_root(qdisc); + + ASSERT_RTNL(); + return qdisc_lock(root); +} + +static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc) +{ + struct Qdisc *root = qdisc_root_sleeping(qdisc); + + ASSERT_RTNL(); + return qdisc_lock(root); +} + +static inline struct net_device *qdisc_dev(struct Qdisc *qdisc) +{ + return qdisc->dev_queue->dev; +} + +static inline void sch_tree_lock(struct Qdisc *q) +{ + spin_lock_bh(qdisc_root_sleeping_lock(q)); +} + +static inline void sch_tree_unlock(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; + +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(struct Qdisc_class_hash *hash, u32 id) +{ + struct Qdisc_class_common *cl; + struct hlist_node *n; + unsigned int h; + + h = qdisc_class_hash(id, hash->hashmask); + hlist_for_each_entry(cl, n, &hash->hash[h], hnode) { + if (cl->classid == id) + return cl; + } + return NULL; +} + +extern int qdisc_class_hash_init(struct Qdisc_class_hash *); +extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *); +extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *); +extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); +extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *); + +extern void dev_init_scheduler(struct net_device *dev); +extern void dev_shutdown(struct net_device *dev); +extern void dev_activate(struct net_device *dev); +extern void dev_deactivate(struct net_device *dev); +extern void dev_deactivate_many(struct list_head *head); +extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, + struct Qdisc *qdisc); +extern void qdisc_reset(struct Qdisc *qdisc); +extern void qdisc_destroy(struct Qdisc *qdisc); +extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); +extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, + struct Qdisc_ops *ops); +extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, + struct Qdisc_ops *ops, u32 parentid); +extern void __qdisc_calculate_pkt_len(struct sk_buff *skb, + const struct qdisc_size_table *stab); +extern void tcf_destroy(struct tcf_proto *tp); +extern void tcf_destroy_chain(struct tcf_proto **fl); + +/* Reset all TX qdiscs greater then index of a device. */ +static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) +{ + struct Qdisc *qdisc; + + for (; i < dev->num_tx_queues; i++) { + qdisc = 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; + for (i = 0; i < dev->num_tx_queues; i++) { + struct netdev_queue *txq = netdev_get_tx_queue(dev, i); + const struct Qdisc *q = txq->qdisc; + + if (q->q.qlen) + return false; + } + return true; +} + +/* Are any of the TX qdiscs changing? */ +static inline bool qdisc_tx_changing(struct net_device *dev) +{ + unsigned int i; + for (i = 0; i < dev->num_tx_queues; i++) { + struct netdev_queue *txq = netdev_get_tx_queue(dev, i); + if (txq->qdisc != txq->qdisc_sleeping) + 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 (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 int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) +{ + qdisc_skb_cb(skb)->pkt_len = skb->len; + return qdisc_enqueue(skb, sch) & NET_XMIT_MASK; +} + + +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 qdisc_bstats_update(struct Qdisc *sch, + const struct sk_buff *skb) +{ + bstats_update(&sch->bstats, skb); +} + +static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, + struct sk_buff_head *list) +{ + __skb_queue_tail(list, skb); + sch->qstats.backlog += qdisc_pkt_len(skb); + + 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)) { + sch->qstats.backlog -= qdisc_pkt_len(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); + sch->qstats.backlog -= len; + 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)) + sch->qstats.backlog -= qdisc_pkt_len(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 */ + 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; + 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 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); + sch->qstats.drops++; + + return NET_XMIT_DROP; +} + +static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) +{ + sch->qstats.drops++; + +#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]; +} + +#ifdef CONFIG_NET_CLS_ACT +static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask, + int action) +{ + struct sk_buff *n; + + n = skb_clone(skb, gfp_mask); + + if (n) { + n->tc_verd = SET_TC_VERD(n->tc_verd, 0); + n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); + n->tc_verd = CLR_TC_MUNGED(n->tc_verd); + } + return n; +} +#endif + +#endif -- cgit v1.2.3