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