include/linux/atmdev.h

   1 /* atmdev.h - ATM device driver declarations and various related items */
   2 #ifndef LINUX_ATMDEV_H
   3 #define LINUX_ATMDEV_H
   4
   5
   6 #include <linux/wait.h> /* wait_queue_head_t */
   7 #include <linux/time.h> /* struct timeval */
   8 #include <linux/net.h>
   9 #include <linux/bug.h>
  10 #include <linux/skbuff.h> /* struct sk_buff */
  11 #include <linux/uio.h>
  12 #include <net/sock.h>
  13 #include <linux/atomic.h>
  14 #include <linux/refcount.h>
  15 #include <uapi/linux/atmdev.h>
  16
  17 #ifdef CONFIG_PROC_FS
  18 #include <linux/proc_fs.h>
  19
  20 extern struct proc_dir_entry *atm_proc_root;
  21 #endif
  22
  23 #ifdef CONFIG_COMPAT
  24 #include <linux/compat.h>
  25 struct compat_atm_iobuf {
  26         int length;
  27         compat_uptr_t buffer;
  28 };
  29 #endif
  30
  31 struct k_atm_aal_stats {
  32 #define __HANDLE_ITEM(i) atomic_t i
  33         __AAL_STAT_ITEMS
  34 #undef __HANDLE_ITEM
  35 };
  36
  37
  38 struct k_atm_dev_stats {
  39         struct k_atm_aal_stats aal0;
  40         struct k_atm_aal_stats aal34;
  41         struct k_atm_aal_stats aal5;
  42 };
  43
  44 struct device;
  45
  46 enum {
  47         ATM_VF_ADDR,            /* Address is in use. Set by anybody, cleared
  48                                    by device driver. */
  49         ATM_VF_READY,           /* VC is ready to transfer data. Set by device
  50                                    driver, cleared by anybody. */
  51         ATM_VF_PARTIAL,         /* resources are bound to PVC (partial PVC
  52                                    setup), controlled by socket layer */
  53         ATM_VF_REGIS,           /* registered with demon, controlled by SVC
  54                                    socket layer */
  55         ATM_VF_BOUND,           /* local SAP is set, controlled by SVC socket
  56                                    layer */
  57         ATM_VF_RELEASED,        /* demon has indicated/requested release,
  58                                    controlled by SVC socket layer */
  59         ATM_VF_HASQOS,          /* QOS parameters have been set */
  60         ATM_VF_LISTEN,          /* socket is used for listening */
  61         ATM_VF_META,            /* SVC socket isn't used for normal data
  62                                    traffic and doesn't depend on signaling
  63                                    to be available */
  64         ATM_VF_SESSION,         /* VCC is p2mp session control descriptor */
  65         ATM_VF_HASSAP,          /* SAP has been set */
  66         ATM_VF_CLOSE,           /* asynchronous close - treat like VF_RELEASED*/
  67         ATM_VF_WAITING,         /* waiting for reply from sigd */
  68         ATM_VF_IS_CLIP,         /* in use by CLIP protocol */
  69 };
  70
  71
  72 #define ATM_VF2VS(flags) \
  73     (test_bit(ATM_VF_READY,&(flags)) ? ATM_VS_CONNECTED : \
  74      test_bit(ATM_VF_RELEASED,&(flags)) ? ATM_VS_CLOSING : \
  75      test_bit(ATM_VF_LISTEN,&(flags)) ? ATM_VS_LISTEN : \
  76      test_bit(ATM_VF_REGIS,&(flags)) ? ATM_VS_INUSE : \
  77      test_bit(ATM_VF_BOUND,&(flags)) ? ATM_VS_BOUND : ATM_VS_IDLE)
  78
  79
  80 enum {
  81         ATM_DF_REMOVED,         /* device was removed from atm_devs list */
  82 };
  83
  84
  85 #define ATM_PHY_SIG_LOST    0   /* no carrier/light */
  86 #define ATM_PHY_SIG_UNKNOWN 1   /* carrier/light status is unknown */
  87 #define ATM_PHY_SIG_FOUND   2   /* carrier/light okay */
  88
  89 #define ATM_ATMOPT_CLP  1       /* set CLP bit */
  90
  91 struct atm_vcc {
  92         /* struct sock has to be the first member of atm_vcc */
  93         struct sock     sk;
  94         unsigned long   flags;          /* VCC flags (ATM_VF_*) */
  95         short           vpi;            /* VPI and VCI (types must be equal */
  96                                         /* with sockaddr) */
  97         int             vci;
  98         unsigned long   aal_options;    /* AAL layer options */
  99         unsigned long   atm_options;    /* ATM layer options */
 100         struct atm_dev  *dev;           /* device back pointer */
 101         struct atm_qos  qos;            /* QOS */
 102         struct atm_sap  sap;            /* SAP */
 103         void (*release_cb)(struct atm_vcc *vcc); /* release_sock callback */
 104         void (*push)(struct atm_vcc *vcc,struct sk_buff *skb);
 105         void (*pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* optional */
 106         int (*push_oam)(struct atm_vcc *vcc,void *cell);
 107         int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
 108         void            *dev_data;      /* per-device data */
 109         void            *proto_data;    /* per-protocol data */
 110         struct k_atm_aal_stats *stats;  /* pointer to AAL stats group */
 111         struct module *owner;           /* owner of ->push function */
 112         /* SVC part --- may move later ------------------------------------- */
 113         short           itf;            /* interface number */
 114         struct sockaddr_atmsvc local;
 115         struct sockaddr_atmsvc remote;
 116         /* Multipoint part ------------------------------------------------- */
 117         struct atm_vcc  *session;       /* session VCC descriptor */
 118         /* Other stuff ----------------------------------------------------- */
 119         void            *user_back;     /* user backlink - not touched by */
 120                                         /* native ATM stack. Currently used */
 121                                         /* by CLIP and sch_atm. */
 122 };
 123
 124 static inline struct atm_vcc *atm_sk(struct sock *sk)
 125 {
 126         return (struct atm_vcc *)sk;
 127 }
 128
 129 static inline struct atm_vcc *ATM_SD(struct socket *sock)
 130 {
 131         return atm_sk(sock->sk);
 132 }
 133
 134 static inline struct sock *sk_atm(struct atm_vcc *vcc)
 135 {
 136         return (struct sock *)vcc;
 137 }
 138
 139 struct atm_dev_addr {
 140         struct sockaddr_atmsvc addr;    /* ATM address */
 141         struct list_head entry;         /* next address */
 142 };
 143
 144 enum atm_addr_type_t { ATM_ADDR_LOCAL, ATM_ADDR_LECS };
 145
 146 struct atm_dev {
 147         const struct atmdev_ops *ops;   /* device operations; NULL if unused */
 148         const struct atmphy_ops *phy;   /* PHY operations, may be undefined */
 149                                         /* (NULL) */
 150         const char      *type;          /* device type name */
 151         int             number;         /* device index */
 152         void            *dev_data;      /* per-device data */
 153         void            *phy_data;      /* private PHY date */
 154         unsigned long   flags;          /* device flags (ATM_DF_*) */
 155         struct list_head local;         /* local ATM addresses */
 156         struct list_head lecs;          /* LECS ATM addresses learned via ILMI */
 157         unsigned char   esi[ESI_LEN];   /* ESI ("MAC" addr) */
 158         struct atm_cirange ci_range;    /* VPI/VCI range */
 159         struct k_atm_dev_stats stats;   /* statistics */
 160         char            signal;         /* signal status (ATM_PHY_SIG_*) */
 161         int             link_rate;      /* link rate (default: OC3) */
 162         refcount_t      refcnt;         /* reference count */
 163         spinlock_t      lock;           /* protect internal members */
 164 #ifdef CONFIG_PROC_FS
 165         struct proc_dir_entry *proc_entry; /* proc entry */
 166         char *proc_name;                /* proc entry name */
 167 #endif
 168         struct device class_dev;        /* sysfs device */
 169         struct list_head dev_list;      /* linkage */
 170 };
 171
 172
 173 /* OF: send_Oam Flags */
 174
 175 #define ATM_OF_IMMED  1         /* Attempt immediate delivery */
 176 #define ATM_OF_INRATE 2         /* Attempt in-rate delivery */
 177
 178
 179 /*
 180  * ioctl, getsockopt, and setsockopt are optional and can be set to NULL.
 181  */
 182
 183 struct atmdev_ops { /* only send is required */
 184         void (*dev_close)(struct atm_dev *dev);
 185         int (*open)(struct atm_vcc *vcc);
 186         void (*close)(struct atm_vcc *vcc);
 187         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
 188 #ifdef CONFIG_COMPAT
 189         int (*compat_ioctl)(struct atm_dev *dev,unsigned int cmd,
 190                             void __user *arg);
 191 #endif
 192         int (*getsockopt)(struct atm_vcc *vcc,int level,int optname,
 193             void __user *optval,int optlen);
 194         int (*setsockopt)(struct atm_vcc *vcc,int level,int optname,
 195             void __user *optval,unsigned int optlen);
 196         int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
 197         int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
 198         void (*phy_put)(struct atm_dev *dev,unsigned char value,
 199             unsigned long addr);
 200         unsigned char (*phy_get)(struct atm_dev *dev,unsigned long addr);
 201         int (*change_qos)(struct atm_vcc *vcc,struct atm_qos *qos,int flags);
 202         int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
 203         struct module *owner;
 204 };
 205
 206 struct atmphy_ops {
 207         int (*start)(struct atm_dev *dev);
 208         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
 209         void (*interrupt)(struct atm_dev *dev);
 210         int (*stop)(struct atm_dev *dev);
 211 };
 212
 213 struct atm_skb_data {
 214         struct atm_vcc  *vcc;           /* ATM VCC */
 215         unsigned long   atm_options;    /* ATM layer options */
 216 };
 217
 218 #define VCC_HTABLE_SIZE 32
 219
 220 extern struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
 221 extern rwlock_t vcc_sklist_lock;
 222
 223 #define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
 224
 225 struct atm_dev *atm_dev_register(const char *type, struct device *parent,
 226                                  const struct atmdev_ops *ops,
 227                                  int number, /* -1 == pick first available */
 228                                  unsigned long *flags);
 229 struct atm_dev *atm_dev_lookup(int number);
 230 void atm_dev_deregister(struct atm_dev *dev);
 231
 232 /* atm_dev_signal_change
 233  *
 234  * Propagate lower layer signal change in atm_dev->signal to netdevice.
 235  * The event will be sent via a notifier call chain.
 236  */
 237 void atm_dev_signal_change(struct atm_dev *dev, char signal);
 238
 239 void vcc_insert_socket(struct sock *sk);
 240
 241 void atm_dev_release_vccs(struct atm_dev *dev);
 242
 243
 244 static inline void atm_force_charge(struct atm_vcc *vcc,int truesize)
 245 {
 246         atomic_add(truesize, &sk_atm(vcc)->sk_rmem_alloc);
 247 }
 248
 249
 250 static inline void atm_return(struct atm_vcc *vcc,int truesize)
 251 {
 252         atomic_sub(truesize, &sk_atm(vcc)->sk_rmem_alloc);
 253 }
 254
 255
 256 static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
 257 {
 258         return (size + refcount_read(&sk_atm(vcc)->sk_wmem_alloc)) <
 259                sk_atm(vcc)->sk_sndbuf;
 260 }
 261
 262
 263 static inline void atm_dev_hold(struct atm_dev *dev)
 264 {
 265         refcount_inc(&dev->refcnt);
 266 }
 267
 268
 269 static inline void atm_dev_put(struct atm_dev *dev)
 270 {
 271         if (refcount_dec_and_test(&dev->refcnt)) {
 272                 BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
 273                 if (dev->ops->dev_close)
 274                         dev->ops->dev_close(dev);
 275                 put_device(&dev->class_dev);
 276         }
 277 }
 278
 279
 280 int atm_charge(struct atm_vcc *vcc,int truesize);
 281 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
 282     gfp_t gfp_flags);
 283 int atm_pcr_goal(const struct atm_trafprm *tp);
 284
 285 void vcc_release_async(struct atm_vcc *vcc, int reply);
 286
 287 struct atm_ioctl {
 288         struct module *owner;
 289         /* A module reference is kept if appropriate over this call.
 290          * Return -ENOIOCTLCMD if you don't handle it. */
 291         int (*ioctl)(struct socket *, unsigned int cmd, unsigned long arg);
 292         struct list_head list;
 293 };
 294
 295 /**
 296  * register_atm_ioctl - register handler for ioctl operations
 297  *
 298  * Special (non-device) handlers of ioctl's should
 299  * register here. If you're a normal device, you should
 300  * set .ioctl in your atmdev_ops instead.
 301  */
 302 void register_atm_ioctl(struct atm_ioctl *);
 303
 304 /**
 305  * deregister_atm_ioctl - remove the ioctl handler
 306  */
 307 void deregister_atm_ioctl(struct atm_ioctl *);
 308
 309
 310 /* register_atmdevice_notifier - register atm_dev notify events
 311  *
 312  * Clients like br2684 will register notify events
 313  * Currently we notify of signal found/lost
 314  */
 315 int register_atmdevice_notifier(struct notifier_block *nb);
 316 void unregister_atmdevice_notifier(struct notifier_block *nb);
 317
 318 #endif