include/net/sch_generic.h

   1 #ifndef __NET_SCHED_GENERIC_H
   2 #define __NET_SCHED_GENERIC_H
   3
   4 #include <linux/netdevice.h>
   5 #include <linux/types.h>
   6 #include <linux/rcupdate.h>
   7 #include <linux/module.h>
   8 #include <linux/pkt_sched.h>
   9 #include <linux/pkt_cls.h>
  10 #include <net/gen_stats.h>
  11 #include <net/rtnetlink.h>
  12
  13 struct Qdisc_ops;
  14 struct qdisc_walker;
  15 struct tcf_walker;
  16 struct module;
  17
  18 struct qdisc_rate_table
  19 {
  20         struct tc_ratespec rate;
  21         u32             data[256];
  22         struct qdisc_rate_table *next;
  23         int             refcnt;
  24 };
  25
  26 enum qdisc_state_t
  27 {
  28         __QDISC_STATE_RUNNING,
  29         __QDISC_STATE_SCHED,
  30         __QDISC_STATE_DEACTIVATED,
  31 };
  32
  33 struct qdisc_size_table {
  34         struct list_head        list;
  35         struct tc_sizespec      szopts;
  36         int                     refcnt;
  37         u16                     data[];
  38 };
  39
  40 struct Qdisc
  41 {
  42         int                     (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
  43         struct sk_buff *        (*dequeue)(struct Qdisc *dev);
  44         unsigned                flags;
  45 #define TCQ_F_BUILTIN   1
  46 #define TCQ_F_THROTTLED 2
  47 #define TCQ_F_INGRESS   4
  48         int                     padded;
  49         struct Qdisc_ops        *ops;
  50         struct qdisc_size_table *stab;
  51         u32                     handle;
  52         u32                     parent;
  53         atomic_t                refcnt;
  54         unsigned long           state;
  55         struct sk_buff          *gso_skb;
  56         struct sk_buff_head     requeue;
  57         struct sk_buff_head     q;
  58         struct netdev_queue     *dev_queue;
  59         struct Qdisc            *next_sched;
  60         struct list_head        list;
  61
  62         struct gnet_stats_basic bstats;
  63         struct gnet_stats_queue qstats;
  64         struct gnet_stats_rate_est      rate_est;
  65         int                     (*reshape_fail)(struct sk_buff *skb,
  66                                         struct Qdisc *q);
  67
  68         void                    *u32_node;
  69
  70         /* This field is deprecated, but it is still used by CBQ
  71          * and it will live until better solution will be invented.
  72          */
  73         struct Qdisc            *__parent;
  74 };
  75
  76 struct Qdisc_class_ops
  77 {
  78         /* Child qdisc manipulation */
  79         int                     (*graft)(struct Qdisc *, unsigned long cl,
  80                                         struct Qdisc *, struct Qdisc **);
  81         struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
  82         void                    (*qlen_notify)(struct Qdisc *, unsigned long);
  83
  84         /* Class manipulation routines */
  85         unsigned long           (*get)(struct Qdisc *, u32 classid);
  86         void                    (*put)(struct Qdisc *, unsigned long);
  87         int                     (*change)(struct Qdisc *, u32, u32,
  88                                         struct nlattr **, unsigned long *);
  89         int                     (*delete)(struct Qdisc *, unsigned long);
  90         void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
  91
  92         /* Filter manipulation */
  93         struct tcf_proto **     (*tcf_chain)(struct Qdisc *, unsigned long);
  94         unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
  95                                         u32 classid);
  96         void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
  97
  98         /* rtnetlink specific */
  99         int                     (*dump)(struct Qdisc *, unsigned long,
 100                                         struct sk_buff *skb, struct tcmsg*);
 101         int                     (*dump_stats)(struct Qdisc *, unsigned long,
 102                                         struct gnet_dump *);
 103 };
 104
 105 struct Qdisc_ops
 106 {
 107         struct Qdisc_ops        *next;
 108         const struct Qdisc_class_ops    *cl_ops;
 109         char                    id[IFNAMSIZ];
 110         int                     priv_size;
 111
 112         int                     (*enqueue)(struct sk_buff *, struct Qdisc *);
 113         struct sk_buff *        (*dequeue)(struct Qdisc *);
 114         int                     (*requeue)(struct sk_buff *, struct Qdisc *);
 115         unsigned int            (*drop)(struct Qdisc *);
 116
 117         int                     (*init)(struct Qdisc *, struct nlattr *arg);
 118         void                    (*reset)(struct Qdisc *);
 119         void                    (*destroy)(struct Qdisc *);
 120         int                     (*change)(struct Qdisc *, struct nlattr *arg);
 121
 122         int                     (*dump)(struct Qdisc *, struct sk_buff *);
 123         int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
 124
 125         struct module           *owner;
 126 };
 127
 128
 129 struct tcf_result
 130 {
 131         unsigned long   class;
 132         u32             classid;
 133 };
 134
 135 struct tcf_proto_ops
 136 {
 137         struct tcf_proto_ops    *next;
 138         char                    kind[IFNAMSIZ];
 139
 140         int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 141                                         struct tcf_result *);
 142         int                     (*init)(struct tcf_proto*);
 143         void                    (*destroy)(struct tcf_proto*);
 144
 145         unsigned long           (*get)(struct tcf_proto*, u32 handle);
 146         void                    (*put)(struct tcf_proto*, unsigned long);
 147         int                     (*change)(struct tcf_proto*, unsigned long,
 148                                         u32 handle, struct nlattr **,
 149                                         unsigned long *);
 150         int                     (*delete)(struct tcf_proto*, unsigned long);
 151         void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
 152
 153         /* rtnetlink specific */
 154         int                     (*dump)(struct tcf_proto*, unsigned long,
 155                                         struct sk_buff *skb, struct tcmsg*);
 156
 157         struct module           *owner;
 158 };
 159
 160 struct tcf_proto
 161 {
 162         /* Fast access part */
 163         struct tcf_proto        *next;
 164         void                    *root;
 165         int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 166                                         struct tcf_result *);
 167         __be16                  protocol;
 168
 169         /* All the rest */
 170         u32                     prio;
 171         u32                     classid;
 172         struct Qdisc            *q;
 173         void                    *data;
 174         struct tcf_proto_ops    *ops;
 175 };
 176
 177 struct qdisc_skb_cb {
 178         unsigned int            pkt_len;
 179         char                    data[];
 180 };
 181
 182 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
 183 {
 184         return (struct qdisc_skb_cb *)skb->cb;
 185 }
 186
 187 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
 188 {
 189         return &qdisc->q.lock;
 190 }
 191
 192 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
 193 {
 194         return qdisc->dev_queue->qdisc;
 195 }
 196
 197 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
 198 {
 199         return qdisc->dev_queue->qdisc_sleeping;
 200 }
 201
 202 /* The qdisc root lock is a mechanism by which to top level
 203  * of a qdisc tree can be locked from any qdisc node in the
 204  * forest.  This allows changing the configuration of some
 205  * aspect of the qdisc tree while blocking out asynchronous
 206  * qdisc access in the packet processing paths.
 207  *
 208  * It is only legal to do this when the root will not change
 209  * on us.  Otherwise we'll potentially lock the wrong qdisc
 210  * root.  This is enforced by holding the RTNL semaphore, which
 211  * all users of this lock accessor must do.
 212  */
 213 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
 214 {
 215         struct Qdisc *root = qdisc_root(qdisc);
 216
 217         ASSERT_RTNL();
 218         return qdisc_lock(root);
 219 }
 220
 221 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
 222 {
 223         struct Qdisc *root = qdisc_root_sleeping(qdisc);
 224
 225         ASSERT_RTNL();
 226         return qdisc_lock(root);
 227 }
 228
 229 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
 230 {
 231         return qdisc->dev_queue->dev;
 232 }
 233
 234 static inline void sch_tree_lock(struct Qdisc *q)
 235 {
 236         spin_lock_bh(qdisc_root_sleeping_lock(q));
 237 }
 238
 239 static inline void sch_tree_unlock(struct Qdisc *q)
 240 {
 241         spin_unlock_bh(qdisc_root_sleeping_lock(q));
 242 }
 243
 244 #define tcf_tree_lock(tp)       sch_tree_lock((tp)->q)
 245 #define tcf_tree_unlock(tp)     sch_tree_unlock((tp)->q)
 246
 247 extern struct Qdisc noop_qdisc;
 248 extern struct Qdisc_ops noop_qdisc_ops;
 249
 250 struct Qdisc_class_common
 251 {
 252         u32                     classid;
 253         struct hlist_node       hnode;
 254 };
 255
 256 struct Qdisc_class_hash
 257 {
 258         struct hlist_head       *hash;
 259         unsigned int            hashsize;
 260         unsigned int            hashmask;
 261         unsigned int            hashelems;
 262 };
 263
 264 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
 265 {
 266         id ^= id >> 8;
 267         id ^= id >> 4;
 268         return id & mask;
 269 }
 270
 271 static inline struct Qdisc_class_common *
 272 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
 273 {
 274         struct Qdisc_class_common *cl;
 275         struct hlist_node *n;
 276         unsigned int h;
 277
 278         h = qdisc_class_hash(id, hash->hashmask);
 279         hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
 280                 if (cl->classid == id)
 281                         return cl;
 282         }
 283         return NULL;
 284 }
 285
 286 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
 287 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 288 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 289 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 290 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 291
 292 extern void dev_init_scheduler(struct net_device *dev);
 293 extern void dev_shutdown(struct net_device *dev);
 294 extern void dev_activate(struct net_device *dev);
 295 extern void dev_deactivate(struct net_device *dev);
 296 extern void qdisc_reset(struct Qdisc *qdisc);
 297 extern void qdisc_destroy(struct Qdisc *qdisc);
 298 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 299 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 300                                  struct Qdisc_ops *ops);
 301 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
 302                                        struct netdev_queue *dev_queue,
 303                                        struct Qdisc_ops *ops, u32 parentid);
 304 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
 305                                    struct qdisc_size_table *stab);
 306 extern void tcf_destroy(struct tcf_proto *tp);
 307 extern void tcf_destroy_chain(struct tcf_proto **fl);
 308
 309 /* Reset all TX qdiscs of a device.  */
 310 static inline void qdisc_reset_all_tx(struct net_device *dev)
 311 {
 312         unsigned int i;
 313         for (i = 0; i < dev->num_tx_queues; i++)
 314                 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
 315 }
 316
 317 /* Are all TX queues of the device empty?  */
 318 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 319 {
 320         unsigned int i;
 321         for (i = 0; i < dev->num_tx_queues; i++) {
 322                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 323                 const struct Qdisc *q = txq->qdisc;
 324
 325                 if (q->q.qlen)
 326                         return false;
 327         }
 328         return true;
 329 }
 330
 331 /* Are any of the TX qdiscs changing?  */
 332 static inline bool qdisc_tx_changing(struct net_device *dev)
 333 {
 334         unsigned int i;
 335         for (i = 0; i < dev->num_tx_queues; i++) {
 336                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 337                 if (txq->qdisc != txq->qdisc_sleeping)
 338                         return true;
 339         }
 340         return false;
 341 }
 342
 343 /* Is the device using the noop qdisc on all queues?  */
 344 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
 345 {
 346         unsigned int i;
 347         for (i = 0; i < dev->num_tx_queues; i++) {
 348                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 349                 if (txq->qdisc != &noop_qdisc)
 350                         return false;
 351         }
 352         return true;
 353 }
 354
 355 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
 356 {
 357         return qdisc_skb_cb(skb)->pkt_len;
 358 }
 359
 360 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
 361 enum net_xmit_qdisc_t {
 362         __NET_XMIT_STOLEN = 0x00010000,
 363         __NET_XMIT_BYPASS = 0x00020000,
 364 };
 365
 366 #ifdef CONFIG_NET_CLS_ACT
 367 #define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
 368 #else
 369 #define net_xmit_drop_count(e)  (1)
 370 #endif
 371
 372 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 373 {
 374 #ifdef CONFIG_NET_SCHED
 375         if (sch->stab)
 376                 qdisc_calculate_pkt_len(skb, sch->stab);
 377 #endif
 378         return sch->enqueue(skb, sch);
 379 }
 380
 381 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
 382 {
 383         qdisc_skb_cb(skb)->pkt_len = skb->len;
 384         return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
 385 }
 386
 387 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 388                                        struct sk_buff_head *list)
 389 {
 390         __skb_queue_tail(list, skb);
 391         sch->qstats.backlog += qdisc_pkt_len(skb);
 392         sch->bstats.bytes += qdisc_pkt_len(skb);
 393         sch->bstats.packets++;
 394
 395         return NET_XMIT_SUCCESS;
 396 }
 397
 398 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 399 {
 400         return __qdisc_enqueue_tail(skb, sch, &sch->q);
 401 }
 402
 403 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 404                                                    struct sk_buff_head *list)
 405 {
 406         struct sk_buff *skb = __skb_dequeue(list);
 407
 408         if (likely(skb != NULL))
 409                 sch->qstats.backlog -= qdisc_pkt_len(skb);
 410
 411         return skb;
 412 }
 413
 414 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 415 {
 416         return __qdisc_dequeue_head(sch, &sch->q);
 417 }
 418
 419 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 420                                                    struct sk_buff_head *list)
 421 {
 422         struct sk_buff *skb = __skb_dequeue_tail(list);
 423
 424         if (likely(skb != NULL))
 425                 sch->qstats.backlog -= qdisc_pkt_len(skb);
 426
 427         return skb;
 428 }
 429
 430 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 431 {
 432         return __qdisc_dequeue_tail(sch, &sch->q);
 433 }
 434
 435 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
 436                                   struct sk_buff_head *list)
 437 {
 438         __skb_queue_head(list, skb);
 439         sch->qstats.backlog += qdisc_pkt_len(skb);
 440         sch->qstats.requeues++;
 441
 442         return NET_XMIT_SUCCESS;
 443 }
 444
 445 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
 446 {
 447         return __qdisc_requeue(skb, sch, &sch->q);
 448 }
 449
 450 static inline void __qdisc_reset_queue(struct Qdisc *sch,
 451                                        struct sk_buff_head *list)
 452 {
 453         /*
 454          * We do not know the backlog in bytes of this list, it
 455          * is up to the caller to correct it
 456          */
 457         __skb_queue_purge(list);
 458 }
 459
 460 static inline void qdisc_reset_queue(struct Qdisc *sch)
 461 {
 462         __qdisc_reset_queue(sch, &sch->q);
 463         sch->qstats.backlog = 0;
 464 }
 465
 466 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 467                                               struct sk_buff_head *list)
 468 {
 469         struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 470
 471         if (likely(skb != NULL)) {
 472                 unsigned int len = qdisc_pkt_len(skb);
 473                 kfree_skb(skb);
 474                 return len;
 475         }
 476
 477         return 0;
 478 }
 479
 480 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 481 {
 482         return __qdisc_queue_drop(sch, &sch->q);
 483 }
 484
 485 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 486 {
 487         kfree_skb(skb);
 488         sch->qstats.drops++;
 489
 490         return NET_XMIT_DROP;
 491 }
 492
 493 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 494 {
 495         sch->qstats.drops++;
 496
 497 #ifdef CONFIG_NET_CLS_ACT
 498         if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 499                 goto drop;
 500
 501         return NET_XMIT_SUCCESS;
 502
 503 drop:
 504 #endif
 505         kfree_skb(skb);
 506         return NET_XMIT_DROP;
 507 }
 508
 509 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
 510    long it will take to send a packet given its size.
 511  */
 512 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 513 {
 514         int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
 515         if (slot < 0)
 516                 slot = 0;
 517         slot >>= rtab->rate.cell_log;
 518         if (slot > 255)
 519                 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
 520         return rtab->data[slot];
 521 }
 522
 523 #ifdef CONFIG_NET_CLS_ACT
 524 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
 525 {
 526         struct sk_buff *n = skb_clone(skb, gfp_mask);
 527
 528         if (n) {
 529                 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
 530                 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
 531                 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
 532         }
 533         return n;
 534 }
 535 #endif
 536
 537 #endif