include/net/sch_generic.h

   1 #ifndef __NET_SCHED_GENERIC_H
   2 #define __NET_SCHED_GENERIC_H
   3
   4 #include <linux/config.h>
   5 #include <linux/netdevice.h>
   6 #include <linux/types.h>
   7 #include <linux/rcupdate.h>
   8 #include <linux/module.h>
   9 #include <linux/rtnetlink.h>
  10 #include <linux/pkt_sched.h>
  11 #include <linux/pkt_cls.h>
  12 #include <net/gen_stats.h>
  13
  14 struct Qdisc_ops;
  15 struct qdisc_walker;
  16 struct tcf_walker;
  17 struct module;
  18
  19 struct qdisc_rate_table
  20 {
  21         struct tc_ratespec rate;
  22         u32             data[256];
  23         struct qdisc_rate_table *next;
  24         int             refcnt;
  25 };
  26
  27 struct Qdisc
  28 {
  29         int                     (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
  30         struct sk_buff *        (*dequeue)(struct Qdisc *dev);
  31         unsigned                flags;
  32 #define TCQ_F_BUILTIN   1
  33 #define TCQ_F_THROTTLED 2
  34 #define TCQ_F_INGRESS   4
  35         int                     padded;
  36         struct Qdisc_ops        *ops;
  37         u32                     handle;
  38         u32                     parent;
  39         atomic_t                refcnt;
  40         struct sk_buff_head     q;
  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
  65         /* Class manipulation routines */
  66         unsigned long           (*get)(struct Qdisc *, u32 classid);
  67         void                    (*put)(struct Qdisc *, unsigned long);
  68         int                     (*change)(struct Qdisc *, u32, u32,
  69                                         struct rtattr **, unsigned long *);
  70         int                     (*delete)(struct Qdisc *, unsigned long);
  71         void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
  72
  73         /* Filter manipulation */
  74         struct tcf_proto **     (*tcf_chain)(struct Qdisc *, unsigned long);
  75         unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
  76                                         u32 classid);
  77         void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
  78
  79         /* rtnetlink specific */
  80         int                     (*dump)(struct Qdisc *, unsigned long,
  81                                         struct sk_buff *skb, struct tcmsg*);
  82         int                     (*dump_stats)(struct Qdisc *, unsigned long,
  83                                         struct gnet_dump *);
  84 };
  85
  86 struct Qdisc_ops
  87 {
  88         struct Qdisc_ops        *next;
  89         struct Qdisc_class_ops  *cl_ops;
  90         char                    id[IFNAMSIZ];
  91         int                     priv_size;
  92
  93         int                     (*enqueue)(struct sk_buff *, struct Qdisc *);
  94         struct sk_buff *        (*dequeue)(struct Qdisc *);
  95         int                     (*requeue)(struct sk_buff *, struct Qdisc *);
  96         unsigned int            (*drop)(struct Qdisc *);
  97
  98         int                     (*init)(struct Qdisc *, struct rtattr *arg);
  99         void                    (*reset)(struct Qdisc *);
 100         void                    (*destroy)(struct Qdisc *);
 101         int                     (*change)(struct Qdisc *, struct rtattr *arg);
 102
 103         int                     (*dump)(struct Qdisc *, struct sk_buff *);
 104         int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
 105
 106         struct module           *owner;
 107 };
 108
 109
 110 struct tcf_result
 111 {
 112         unsigned long   class;
 113         u32             classid;
 114 };
 115
 116 struct tcf_proto_ops
 117 {
 118         struct tcf_proto_ops    *next;
 119         char                    kind[IFNAMSIZ];
 120
 121         int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 122                                         struct tcf_result *);
 123         int                     (*init)(struct tcf_proto*);
 124         void                    (*destroy)(struct tcf_proto*);
 125
 126         unsigned long           (*get)(struct tcf_proto*, u32 handle);
 127         void                    (*put)(struct tcf_proto*, unsigned long);
 128         int                     (*change)(struct tcf_proto*, unsigned long,
 129                                         u32 handle, struct rtattr **,
 130                                         unsigned long *);
 131         int                     (*delete)(struct tcf_proto*, unsigned long);
 132         void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
 133
 134         /* rtnetlink specific */
 135         int                     (*dump)(struct tcf_proto*, unsigned long,
 136                                         struct sk_buff *skb, struct tcmsg*);
 137
 138         struct module           *owner;
 139 };
 140
 141 struct tcf_proto
 142 {
 143         /* Fast access part */
 144         struct tcf_proto        *next;
 145         void                    *root;
 146         int                     (*classify)(struct sk_buff*, struct tcf_proto*,
 147                                         struct tcf_result *);
 148         u32                     protocol;
 149
 150         /* All the rest */
 151         u32                     prio;
 152         u32                     classid;
 153         struct Qdisc            *q;
 154         void                    *data;
 155         struct tcf_proto_ops    *ops;
 156 };
 157
 158
 159 extern void qdisc_lock_tree(struct net_device *dev);
 160 extern void qdisc_unlock_tree(struct net_device *dev);
 161
 162 #define sch_tree_lock(q)        qdisc_lock_tree((q)->dev)
 163 #define sch_tree_unlock(q)      qdisc_unlock_tree((q)->dev)
 164 #define tcf_tree_lock(tp)       qdisc_lock_tree((tp)->q->dev)
 165 #define tcf_tree_unlock(tp)     qdisc_unlock_tree((tp)->q->dev)
 166
 167 extern struct Qdisc noop_qdisc;
 168 extern struct Qdisc_ops noop_qdisc_ops;
 169
 170 extern void dev_init_scheduler(struct net_device *dev);
 171 extern void dev_shutdown(struct net_device *dev);
 172 extern void dev_activate(struct net_device *dev);
 173 extern void dev_deactivate(struct net_device *dev);
 174 extern void qdisc_reset(struct Qdisc *qdisc);
 175 extern void qdisc_destroy(struct Qdisc *qdisc);
 176 extern struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops);
 177 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
 178                                        struct Qdisc_ops *ops);
 179
 180 static inline void
 181 tcf_destroy(struct tcf_proto *tp)
 182 {
 183         tp->ops->destroy(tp);
 184         module_put(tp->ops->owner);
 185         kfree(tp);
 186 }
 187
 188 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 189                                        struct sk_buff_head *list)
 190 {
 191         __skb_queue_tail(list, skb);
 192         sch->qstats.backlog += skb->len;
 193         sch->bstats.bytes += skb->len;
 194         sch->bstats.packets++;
 195
 196         return NET_XMIT_SUCCESS;
 197 }
 198
 199 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 200 {
 201         return __qdisc_enqueue_tail(skb, sch, &sch->q);
 202 }
 203
 204 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 205                                                    struct sk_buff_head *list)
 206 {
 207         struct sk_buff *skb = __skb_dequeue(list);
 208
 209         if (likely(skb != NULL))
 210                 sch->qstats.backlog -= skb->len;
 211
 212         return skb;
 213 }
 214
 215 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 216 {
 217         return __qdisc_dequeue_head(sch, &sch->q);
 218 }
 219
 220 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 221                                                    struct sk_buff_head *list)
 222 {
 223         struct sk_buff *skb = __skb_dequeue_tail(list);
 224
 225         if (likely(skb != NULL))
 226                 sch->qstats.backlog -= skb->len;
 227
 228         return skb;
 229 }
 230
 231 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 232 {
 233         return __qdisc_dequeue_tail(sch, &sch->q);
 234 }
 235
 236 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
 237                                   struct sk_buff_head *list)
 238 {
 239         __skb_queue_head(list, skb);
 240         sch->qstats.backlog += skb->len;
 241         sch->qstats.requeues++;
 242
 243         return NET_XMIT_SUCCESS;
 244 }
 245
 246 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
 247 {
 248         return __qdisc_requeue(skb, sch, &sch->q);
 249 }
 250
 251 static inline void __qdisc_reset_queue(struct Qdisc *sch,
 252                                        struct sk_buff_head *list)
 253 {
 254         /*
 255          * We do not know the backlog in bytes of this list, it
 256          * is up to the caller to correct it
 257          */
 258         skb_queue_purge(list);
 259 }
 260
 261 static inline void qdisc_reset_queue(struct Qdisc *sch)
 262 {
 263         __qdisc_reset_queue(sch, &sch->q);
 264         sch->qstats.backlog = 0;
 265 }
 266
 267 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 268                                               struct sk_buff_head *list)
 269 {
 270         struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 271
 272         if (likely(skb != NULL)) {
 273                 unsigned int len = skb->len;
 274                 kfree_skb(skb);
 275                 return len;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 282 {
 283         return __qdisc_queue_drop(sch, &sch->q);
 284 }
 285
 286 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 287 {
 288         kfree_skb(skb);
 289         sch->qstats.drops++;
 290
 291         return NET_XMIT_DROP;
 292 }
 293
 294 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 295 {
 296         sch->qstats.drops++;
 297
 298 #ifdef CONFIG_NET_CLS_POLICE
 299         if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 300                 goto drop;
 301
 302         return NET_XMIT_SUCCESS;
 303
 304 drop:
 305 #endif
 306         kfree_skb(skb);
 307         return NET_XMIT_DROP;
 308 }
 309
 310 #endif