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 struct Qdisc
  27 {
  28         int                     (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
  29         struct sk_buff *        (*dequeue)(struct Qdisc *dev);
  30         unsigned                flags;
  31 #define TCQ_F_BUILTIN   1
  32 #define TCQ_F_THROTTLED 2
  33 #define TCQ_F_INGRESS   4
  34         int                     padded;
  35         struct Qdisc_ops        *ops;
  36         u32                     handle;
  37         u32                     parent;
  38         atomic_t                refcnt;
  39         struct sk_buff_head     q;
  40         struct netdev_queue     *dev_queue;
  41         struct list_head        list;
  42
  43         struct gnet_stats_basic bstats;
  44         struct gnet_stats_queue qstats;
  45         struct gnet_stats_rate_est      rate_est;
  46         struct rcu_head         q_rcu;
  47         int                     (*reshape_fail)(struct sk_buff *skb,
  48                                         struct Qdisc *q);
  49
  50         /* This field is deprecated, but it is still used by CBQ
  51          * and it will live until better solution will be invented.
  52          */
  53         struct Qdisc            *__parent;
  54 };
  55
  56 struct Qdisc_class_ops
  57 {
  58         /* Child qdisc manipulation */
  59         int                     (*graft)(struct Qdisc *, unsigned long cl,
  60                                         struct Qdisc *, struct Qdisc **);
  61         struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
  62         void                    (*qlen_notify)(struct Qdisc *, unsigned long);
  63
  64         /* Class manipulation routines */
  65         unsigned long           (*get)(struct Qdisc *, u32 classid);
  66         void                    (*put)(struct Qdisc *, unsigned long);
  67         int                     (*change)(struct Qdisc *, u32, u32,
  68                                         struct nlattr **, unsigned long *);
  69         int                     (*delete)(struct Qdisc *, unsigned long);
  70         void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
  71
  72         /* Filter manipulation */
  73         struct tcf_proto **     (*tcf_chain)(struct Qdisc *, unsigned long);
  74         unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
  75                                         u32 classid);
  76         void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
  77
  78         /* rtnetlink specific */
  79         int                     (*dump)(struct Qdisc *, unsigned long,
  80                                         struct sk_buff *skb, struct tcmsg*);
  81         int                     (*dump_stats)(struct Qdisc *, unsigned long,
  82                                         struct gnet_dump *);
  83 };
  84
  85 struct Qdisc_ops
  86 {
  87         struct Qdisc_ops        *next;
  88         const struct Qdisc_class_ops    *cl_ops;
  89         char                    id[IFNAMSIZ];
  90         int                     priv_size;
  91
  92         int                     (*enqueue)(struct sk_buff *, struct Qdisc *);
  93         struct sk_buff *        (*dequeue)(struct Qdisc *);
  94         int                     (*requeue)(struct sk_buff *, struct Qdisc *);
  95         unsigned int            (*drop)(struct Qdisc *);
  96
  97         int                     (*init)(struct Qdisc *, struct nlattr *arg);
  98         void                    (*reset)(struct Qdisc *);
  99         void                    (*destroy)(struct Qdisc *);
 100         int                     (*change)(struct Qdisc *, struct nlattr *arg);
 101
 102         int                     (*dump)(struct Qdisc *, struct sk_buff *);
 103         int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
 104
 105         struct module           *owner;
 106 };
 107
 108
 109 struct tcf_result
 110 {
 111         unsigned long   class;
 112         u32             classid;
 113 };
 114
 115 struct tcf_proto_ops
 116 {
 117         struct tcf_proto_ops    *next;
 118         char                    kind[IFNAMSIZ];
 119
 120         int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 121                                         struct tcf_result *);
 122         int                     (*init)(struct tcf_proto*);
 123         void                    (*destroy)(struct tcf_proto*);
 124
 125         unsigned long           (*get)(struct tcf_proto*, u32 handle);
 126         void                    (*put)(struct tcf_proto*, unsigned long);
 127         int                     (*change)(struct tcf_proto*, unsigned long,
 128                                         u32 handle, struct nlattr **,
 129                                         unsigned long *);
 130         int                     (*delete)(struct tcf_proto*, unsigned long);
 131         void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
 132
 133         /* rtnetlink specific */
 134         int                     (*dump)(struct tcf_proto*, unsigned long,
 135                                         struct sk_buff *skb, struct tcmsg*);
 136
 137         struct module           *owner;
 138 };
 139
 140 struct tcf_proto
 141 {
 142         /* Fast access part */
 143         struct tcf_proto        *next;
 144         void                    *root;
 145         int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 146                                         struct tcf_result *);
 147         __be16                  protocol;
 148
 149         /* All the rest */
 150         u32                     prio;
 151         u32                     classid;
 152         struct Qdisc            *q;
 153         void                    *data;
 154         struct tcf_proto_ops    *ops;
 155 };
 156
 157 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
 158 {
 159         return qdisc->dev_queue->dev;
 160 }
 161
 162 extern void qdisc_lock_tree(struct net_device *dev);
 163 extern void qdisc_unlock_tree(struct net_device *dev);
 164
 165 #define sch_tree_lock(q)        qdisc_lock_tree(qdisc_dev(q))
 166 #define sch_tree_unlock(q)      qdisc_unlock_tree(qdisc_dev(q))
 167 #define tcf_tree_lock(tp)       qdisc_lock_tree(qdisc_dev((tp)->q))
 168 #define tcf_tree_unlock(tp)     qdisc_unlock_tree(qdisc_dev((tp)->q))
 169
 170 extern struct Qdisc noop_qdisc;
 171 extern struct Qdisc_ops noop_qdisc_ops;
 172
 173 struct Qdisc_class_common
 174 {
 175         u32                     classid;
 176         struct hlist_node       hnode;
 177 };
 178
 179 struct Qdisc_class_hash
 180 {
 181         struct hlist_head       *hash;
 182         unsigned int            hashsize;
 183         unsigned int            hashmask;
 184         unsigned int            hashelems;
 185 };
 186
 187 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
 188 {
 189         id ^= id >> 8;
 190         id ^= id >> 4;
 191         return id & mask;
 192 }
 193
 194 static inline struct Qdisc_class_common *
 195 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
 196 {
 197         struct Qdisc_class_common *cl;
 198         struct hlist_node *n;
 199         unsigned int h;
 200
 201         h = qdisc_class_hash(id, hash->hashmask);
 202         hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
 203                 if (cl->classid == id)
 204                         return cl;
 205         }
 206         return NULL;
 207 }
 208
 209 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
 210 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 211 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 212 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 213 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 214
 215 extern void dev_init_scheduler(struct net_device *dev);
 216 extern void dev_shutdown(struct net_device *dev);
 217 extern void dev_activate(struct net_device *dev);
 218 extern void dev_deactivate(struct net_device *dev);
 219 extern void qdisc_reset(struct Qdisc *qdisc);
 220 extern void qdisc_destroy(struct Qdisc *qdisc);
 221 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 222 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 223                                  struct Qdisc_ops *ops);
 224 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
 225                                        struct netdev_queue *dev_queue,
 226                                        struct Qdisc_ops *ops, u32 parentid);
 227 extern void tcf_destroy(struct tcf_proto *tp);
 228 extern void tcf_destroy_chain(struct tcf_proto **fl);
 229
 230 /* Reset all TX qdiscs of a device.  */
 231 static inline void qdisc_reset_all_tx(struct net_device *dev)
 232 {
 233         qdisc_reset(dev->tx_queue.qdisc);
 234 }
 235
 236 /* Are all TX queues of the device empty?  */
 237 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 238 {
 239         const struct netdev_queue *txq = &dev->tx_queue;
 240         const struct Qdisc *q = txq->qdisc;
 241
 242         return (q->q.qlen == 0);
 243 }
 244
 245 /* Are any of the TX qdiscs changing?  */
 246 static inline bool qdisc_tx_changing(struct net_device *dev)
 247 {
 248         struct netdev_queue *txq = &dev->tx_queue;
 249
 250         return (txq->qdisc != txq->qdisc_sleeping);
 251 }
 252
 253 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 254                                        struct sk_buff_head *list)
 255 {
 256         __skb_queue_tail(list, skb);
 257         sch->qstats.backlog += skb->len;
 258         sch->bstats.bytes += skb->len;
 259         sch->bstats.packets++;
 260
 261         return NET_XMIT_SUCCESS;
 262 }
 263
 264 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 265 {
 266         return __qdisc_enqueue_tail(skb, sch, &sch->q);
 267 }
 268
 269 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 270                                                    struct sk_buff_head *list)
 271 {
 272         struct sk_buff *skb = __skb_dequeue(list);
 273
 274         if (likely(skb != NULL))
 275                 sch->qstats.backlog -= skb->len;
 276
 277         return skb;
 278 }
 279
 280 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 281 {
 282         return __qdisc_dequeue_head(sch, &sch->q);
 283 }
 284
 285 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 286                                                    struct sk_buff_head *list)
 287 {
 288         struct sk_buff *skb = __skb_dequeue_tail(list);
 289
 290         if (likely(skb != NULL))
 291                 sch->qstats.backlog -= skb->len;
 292
 293         return skb;
 294 }
 295
 296 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 297 {
 298         return __qdisc_dequeue_tail(sch, &sch->q);
 299 }
 300
 301 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
 302                                   struct sk_buff_head *list)
 303 {
 304         __skb_queue_head(list, skb);
 305         sch->qstats.backlog += skb->len;
 306         sch->qstats.requeues++;
 307
 308         return NET_XMIT_SUCCESS;
 309 }
 310
 311 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
 312 {
 313         return __qdisc_requeue(skb, sch, &sch->q);
 314 }
 315
 316 static inline void __qdisc_reset_queue(struct Qdisc *sch,
 317                                        struct sk_buff_head *list)
 318 {
 319         /*
 320          * We do not know the backlog in bytes of this list, it
 321          * is up to the caller to correct it
 322          */
 323         skb_queue_purge(list);
 324 }
 325
 326 static inline void qdisc_reset_queue(struct Qdisc *sch)
 327 {
 328         __qdisc_reset_queue(sch, &sch->q);
 329         sch->qstats.backlog = 0;
 330 }
 331
 332 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 333                                               struct sk_buff_head *list)
 334 {
 335         struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 336
 337         if (likely(skb != NULL)) {
 338                 unsigned int len = skb->len;
 339                 kfree_skb(skb);
 340                 return len;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 347 {
 348         return __qdisc_queue_drop(sch, &sch->q);
 349 }
 350
 351 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 352 {
 353         kfree_skb(skb);
 354         sch->qstats.drops++;
 355
 356         return NET_XMIT_DROP;
 357 }
 358
 359 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 360 {
 361         sch->qstats.drops++;
 362
 363 #ifdef CONFIG_NET_CLS_ACT
 364         if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 365                 goto drop;
 366
 367         return NET_XMIT_SUCCESS;
 368
 369 drop:
 370 #endif
 371         kfree_skb(skb);
 372         return NET_XMIT_DROP;
 373 }
 374
 375 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
 376    long it will take to send a packet given its size.
 377  */
 378 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 379 {
 380         int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
 381         if (slot < 0)
 382                 slot = 0;
 383         slot >>= rtab->rate.cell_log;
 384         if (slot > 255)
 385                 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
 386         return rtab->data[slot];
 387 }
 388
 389 #ifdef CONFIG_NET_CLS_ACT
 390 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
 391 {
 392         struct sk_buff *n = skb_clone(skb, gfp_mask);
 393
 394         if (n) {
 395                 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
 396                 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
 397                 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
 398         }
 399         return n;
 400 }
 401 #endif
 402
 403 #endif