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 net_device       *dev;
  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         spinlock_t              *stats_lock;
  47         struct rcu_head         q_rcu;
  48         int                     (*reshape_fail)(struct sk_buff *skb,
  49                                         struct Qdisc *q);
  50
  51         /* This field is deprecated, but it is still used by CBQ
  52          * and it will live until better solution will be invented.
  53          */
  54         struct Qdisc            *__parent;
  55 };
  56
  57 struct Qdisc_class_ops
  58 {
  59         /* Child qdisc manipulation */
  60         int                     (*graft)(struct Qdisc *, unsigned long cl,
  61                                         struct Qdisc *, struct Qdisc **);
  62         struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
  63         void                    (*qlen_notify)(struct Qdisc *, unsigned long);
  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         __be16                  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 void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 177 extern struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops);
 178 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
 179                                        struct Qdisc_ops *ops, u32 parentid);
 180 extern void tcf_destroy(struct tcf_proto *tp);
 181 extern void tcf_destroy_chain(struct tcf_proto *fl);
 182
 183 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 184                                        struct sk_buff_head *list)
 185 {
 186         __skb_queue_tail(list, skb);
 187         sch->qstats.backlog += skb->len;
 188         sch->bstats.bytes += skb->len;
 189         sch->bstats.packets++;
 190
 191         return NET_XMIT_SUCCESS;
 192 }
 193
 194 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 195 {
 196         return __qdisc_enqueue_tail(skb, sch, &sch->q);
 197 }
 198
 199 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 200                                                    struct sk_buff_head *list)
 201 {
 202         struct sk_buff *skb = __skb_dequeue(list);
 203
 204         if (likely(skb != NULL))
 205                 sch->qstats.backlog -= skb->len;
 206
 207         return skb;
 208 }
 209
 210 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 211 {
 212         return __qdisc_dequeue_head(sch, &sch->q);
 213 }
 214
 215 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 216                                                    struct sk_buff_head *list)
 217 {
 218         struct sk_buff *skb = __skb_dequeue_tail(list);
 219
 220         if (likely(skb != NULL))
 221                 sch->qstats.backlog -= skb->len;
 222
 223         return skb;
 224 }
 225
 226 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 227 {
 228         return __qdisc_dequeue_tail(sch, &sch->q);
 229 }
 230
 231 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
 232                                   struct sk_buff_head *list)
 233 {
 234         __skb_queue_head(list, skb);
 235         sch->qstats.backlog += skb->len;
 236         sch->qstats.requeues++;
 237
 238         return NET_XMIT_SUCCESS;
 239 }
 240
 241 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
 242 {
 243         return __qdisc_requeue(skb, sch, &sch->q);
 244 }
 245
 246 static inline void __qdisc_reset_queue(struct Qdisc *sch,
 247                                        struct sk_buff_head *list)
 248 {
 249         /*
 250          * We do not know the backlog in bytes of this list, it
 251          * is up to the caller to correct it
 252          */
 253         skb_queue_purge(list);
 254 }
 255
 256 static inline void qdisc_reset_queue(struct Qdisc *sch)
 257 {
 258         __qdisc_reset_queue(sch, &sch->q);
 259         sch->qstats.backlog = 0;
 260 }
 261
 262 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 263                                               struct sk_buff_head *list)
 264 {
 265         struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 266
 267         if (likely(skb != NULL)) {
 268                 unsigned int len = skb->len;
 269                 kfree_skb(skb);
 270                 return len;
 271         }
 272
 273         return 0;
 274 }
 275
 276 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 277 {
 278         return __qdisc_queue_drop(sch, &sch->q);
 279 }
 280
 281 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 282 {
 283         kfree_skb(skb);
 284         sch->qstats.drops++;
 285
 286         return NET_XMIT_DROP;
 287 }
 288
 289 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 290 {
 291         sch->qstats.drops++;
 292
 293 #ifdef CONFIG_NET_CLS_ACT
 294         if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 295                 goto drop;
 296
 297         return NET_XMIT_SUCCESS;
 298
 299 drop:
 300 #endif
 301         kfree_skb(skb);
 302         return NET_XMIT_DROP;
 303 }
 304
 305 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
 306    long it will take to send a packet given its size.
 307  */
 308 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 309 {
 310         int slot = pktlen;
 311         slot >>= rtab->rate.cell_log;
 312         if (slot > 255)
 313                 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
 314         return rtab->data[slot];
 315 }
 316
 317 #endif