v4.19.13 snapshot.
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
new file mode 100644
index 0000000..a6d0009
--- /dev/null
+++ b/include/net/sch_generic.h
@@ -0,0 +1,1139 @@
+/* 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 <net/gen_stats.h>
+#include <net/rtnetlink.h>
+
+struct Qdisc_ops;
+struct qdisc_walker;
+struct tcf_walker;
+struct module;
+
+typedef int tc_setup_cb_t(enum tc_setup_type type,
+ void *type_data, void *cb_priv);
+
+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,
+};
+
+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_cpu __percpu *cpu_bstats;
+ struct gnet_stats_queue __percpu *cpu_qstats;
+ int padded;
+ 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_packed bstats;
+ seqcount_t running;
+ struct gnet_stats_queue qstats;
+ unsigned long state;
+ struct Qdisc *next_sched;
+ struct sk_buff_head skb_bad_txq;
+
+ spinlock_t busylock ____cacheline_aligned_in_smp;
+ spinlock_t seqlock;
+};
+
+static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
+{
+ if (qdisc->flags & TCQ_F_BUILTIN)
+ return;
+ refcount_inc(&qdisc->refcnt);
+}
+
+static inline bool qdisc_is_running(struct Qdisc *qdisc)
+{
+ if (qdisc->flags & TCQ_F_NOLOCK)
+ return spin_is_locked(&qdisc->seqlock);
+ return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
+}
+
+static inline bool qdisc_run_begin(struct Qdisc *qdisc)
+{
+ if (qdisc->flags & TCQ_F_NOLOCK) {
+ if (!spin_trylock(&qdisc->seqlock))
+ return false;
+ } else if (qdisc_is_running(qdisc)) {
+ return false;
+ }
+ /* Variant of write_seqcount_begin() telling lockdep a trylock
+ * was attempted.
+ */
+ raw_write_seqcount_begin(&qdisc->running);
+ seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
+ return true;
+}
+
+static inline void qdisc_run_end(struct Qdisc *qdisc)
+{
+ write_seqcount_end(&qdisc->running);
+ if (qdisc->flags & TCQ_F_NOLOCK)
+ spin_unlock(&qdisc->seqlock);
+}
+
+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 {
+ /* 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);
+ 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 *);
+};
+
+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);
+
+ int (*dump)(struct Qdisc *, struct sk_buff *);
+ int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
+
+ void (*ingress_block_set)(struct Qdisc *sch,
+ u32 block_index);
+ void (*egress_block_set)(struct Qdisc *sch,
+ u32 block_index);
+ u32 (*ingress_block_get)(struct Qdisc *sch);
+ u32 (*egress_block_get)(struct Qdisc *sch);
+
+ struct module *owner;
+};
+
+
+struct tcf_result {
+ union {
+ struct {
+ unsigned long class;
+ u32 classid;
+ };
+ const struct tcf_proto *goto_tp;
+
+ /* used by the TC_ACT_REINSERT action */
+ struct {
+ bool ingress;
+ struct gnet_stats_queue *qstats;
+ };
+ };
+};
+
+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,
+ struct netlink_ext_ack *extack);
+
+ void* (*get)(struct tcf_proto*, u32 handle);
+ int (*change)(struct net *net, struct sk_buff *,
+ struct tcf_proto*, unsigned long,
+ u32 handle, struct nlattr **,
+ void **, bool,
+ struct netlink_ext_ack *);
+ int (*delete)(struct tcf_proto *tp, void *arg,
+ bool *last,
+ struct netlink_ext_ack *);
+ void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
+ int (*reoffload)(struct tcf_proto *tp, bool add,
+ tc_setup_cb_t *cb, void *cb_priv,
+ struct netlink_ext_ack *extack);
+ void (*bind_class)(void *, u32, 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*);
+ int (*tmplt_dump)(struct sk_buff *skb,
+ struct net *net,
+ void *tmplt_priv);
+
+ struct module *owner;
+};
+
+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;
+ 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];
+};
+
+typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
+
+struct tcf_chain {
+ 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;
+ const struct tcf_proto_ops *tmplt_ops;
+ void *tmplt_priv;
+};
+
+struct tcf_block {
+ struct list_head chain_list;
+ u32 index; /* block index for shared blocks */
+ unsigned int refcnt;
+ struct net *net;
+ struct Qdisc *q;
+ struct list_head cb_list;
+ struct list_head owner_list;
+ bool keep_dst;
+ unsigned int offloadcnt; /* Number of oddloaded filters */
+ unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
+ struct {
+ struct tcf_chain *chain;
+ struct list_head filter_chain_list;
+ } chain0;
+};
+
+static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
+{
+ if (*flags & TCA_CLS_FLAGS_IN_HW)
+ return;
+ *flags |= TCA_CLS_FLAGS_IN_HW;
+ block->offloadcnt++;
+}
+
+static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags)
+{
+ if (!(*flags & TCA_CLS_FLAGS_IN_HW))
+ return;
+ *flags &= ~TCA_CLS_FLAGS_IN_HW;
+ block->offloadcnt--;
+}
+
+static inline void
+tc_cls_offload_cnt_update(struct tcf_block *block, unsigned int *cnt,
+ u32 *flags, bool add)
+{
+ if (add) {
+ if (!*cnt)
+ tcf_block_offload_inc(block, flags);
+ (*cnt)++;
+ } else {
+ (*cnt)--;
+ if (!*cnt)
+ tcf_block_offload_dec(block, flags);
+ }
+}
+
+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_cpu(const struct Qdisc *q)
+{
+ return this_cpu_ptr(q->cpu_qstats)->qlen;
+}
+
+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 (q->flags & TCQ_F_NOLOCK) {
+ 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_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 seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
+{
+ struct Qdisc *root = qdisc_root_sleeping(qdisc);
+
+ ASSERT_RTNL();
+ return &root->running;
+}
+
+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));
+}
+
+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_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 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 void skb_reset_tc(struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ skb->tc_redirected = 0;
+#endif
+}
+
+static inline bool skb_is_tc_redirected(const struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ return skb->tc_redirected;
+#else
+ return false;
+#endif
+}
+
+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));
+ }
+ }
+}
+
+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,
+ struct sk_buff **to_free)
+{
+ qdisc_calculate_pkt_len(skb, sch);
+ return sch->enqueue(skb, sch, to_free);
+}
+
+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,
+ __u64 bytes, __u32 packets)
+{
+ bstats->bytes += bytes;
+ bstats->packets += packets;
+}
+
+static inline void bstats_update(struct gnet_stats_basic_packed *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 _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
+ __u64 bytes, __u32 packets)
+{
+ u64_stats_update_begin(&bstats->syncp);
+ _bstats_update(&bstats->bstats, bytes, packets);
+ u64_stats_update_end(&bstats->syncp);
+}
+
+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_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 void qdisc_skb_head_init(struct qdisc_skb_head *qh)
+{
+ qh->head = NULL;
+ qh->tail = NULL;
+ qh->qlen = 0;
+}
+
+static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
+ 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++;
+ 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_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 unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
+ struct sk_buff **to_free)
+{
+ return __qdisc_queue_drop_head(sch, &sch->q, to_free);
+}
+
+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;
+}
+
+/* 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);
+ 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);
+ 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 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;
+ 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);
+}
+
+/* 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 gnet_stats_basic_cpu __percpu *cpu_bstats;
+ struct gnet_stats_queue __percpu *cpu_qstats;
+ struct rcu_head rcu;
+};
+
+static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
+ const struct sk_buff *skb)
+{
+ bstats_cpu_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);
+
+static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
+{
+ struct gnet_stats_queue *stats = res->qstats;
+ int ret;
+
+ if (res->ingress)
+ ret = netif_receive_skb(skb);
+ else
+ ret = dev_queue_xmit(skb);
+ if (ret && stats)
+ qstats_overlimit_inc(res->qstats);
+}
+
+#endif