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Linux/include/linux/atmdev.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /* atmdev.h - ATM device driver declarations and various related items */
  3 #ifndef LINUX_ATMDEV_H
  4 #define LINUX_ATMDEV_H
  5 
  6 
  7 #include <linux/wait.h> /* wait_queue_head_t */
  8 #include <linux/time.h> /* struct timeval */
  9 #include <linux/net.h>
 10 #include <linux/bug.h>
 11 #include <linux/skbuff.h> /* struct sk_buff */
 12 #include <linux/uio.h>
 13 #include <net/sock.h>
 14 #include <linux/atomic.h>
 15 #include <linux/refcount.h>
 16 #include <uapi/linux/atmdev.h>
 17 
 18 #ifdef CONFIG_PROC_FS
 19 #include <linux/proc_fs.h>
 20 
 21 extern struct proc_dir_entry *atm_proc_root;
 22 #endif
 23 
 24 #ifdef CONFIG_COMPAT
 25 #include <linux/compat.h>
 26 struct compat_atm_iobuf {
 27         int length;
 28         compat_uptr_t buffer;
 29 };
 30 #endif
 31 
 32 struct k_atm_aal_stats {
 33 #define __HANDLE_ITEM(i) atomic_t i
 34         __AAL_STAT_ITEMS
 35 #undef __HANDLE_ITEM
 36 };
 37 
 38 
 39 struct k_atm_dev_stats {
 40         struct k_atm_aal_stats aal0;
 41         struct k_atm_aal_stats aal34;
 42         struct k_atm_aal_stats aal5;
 43 };
 44 
 45 struct device;
 46 
 47 enum {
 48         ATM_VF_ADDR,            /* Address is in use. Set by anybody, cleared
 49                                    by device driver. */
 50         ATM_VF_READY,           /* VC is ready to transfer data. Set by device
 51                                    driver, cleared by anybody. */
 52         ATM_VF_PARTIAL,         /* resources are bound to PVC (partial PVC
 53                                    setup), controlled by socket layer */
 54         ATM_VF_REGIS,           /* registered with demon, controlled by SVC
 55                                    socket layer */
 56         ATM_VF_BOUND,           /* local SAP is set, controlled by SVC socket
 57                                    layer */
 58         ATM_VF_RELEASED,        /* demon has indicated/requested release,
 59                                    controlled by SVC socket layer */
 60         ATM_VF_HASQOS,          /* QOS parameters have been set */
 61         ATM_VF_LISTEN,          /* socket is used for listening */
 62         ATM_VF_META,            /* SVC socket isn't used for normal data
 63                                    traffic and doesn't depend on signaling
 64                                    to be available */
 65         ATM_VF_SESSION,         /* VCC is p2mp session control descriptor */
 66         ATM_VF_HASSAP,          /* SAP has been set */
 67         ATM_VF_CLOSE,           /* asynchronous close - treat like VF_RELEASED*/
 68         ATM_VF_WAITING,         /* waiting for reply from sigd */
 69         ATM_VF_IS_CLIP,         /* in use by CLIP protocol */
 70 };
 71 
 72 
 73 #define ATM_VF2VS(flags) \
 74     (test_bit(ATM_VF_READY,&(flags)) ? ATM_VS_CONNECTED : \
 75      test_bit(ATM_VF_RELEASED,&(flags)) ? ATM_VS_CLOSING : \
 76      test_bit(ATM_VF_LISTEN,&(flags)) ? ATM_VS_LISTEN : \
 77      test_bit(ATM_VF_REGIS,&(flags)) ? ATM_VS_INUSE : \
 78      test_bit(ATM_VF_BOUND,&(flags)) ? ATM_VS_BOUND : ATM_VS_IDLE)
 79 
 80 
 81 enum {
 82         ATM_DF_REMOVED,         /* device was removed from atm_devs list */
 83 };
 84 
 85 
 86 #define ATM_PHY_SIG_LOST    0   /* no carrier/light */
 87 #define ATM_PHY_SIG_UNKNOWN 1   /* carrier/light status is unknown */
 88 #define ATM_PHY_SIG_FOUND   2   /* carrier/light okay */
 89 
 90 #define ATM_ATMOPT_CLP  1       /* set CLP bit */
 91 
 92 struct atm_vcc {
 93         /* struct sock has to be the first member of atm_vcc */
 94         struct sock     sk;
 95         unsigned long   flags;          /* VCC flags (ATM_VF_*) */
 96         short           vpi;            /* VPI and VCI (types must be equal */
 97                                         /* with sockaddr) */
 98         int             vci;
 99         unsigned long   aal_options;    /* AAL layer options */
100         unsigned long   atm_options;    /* ATM layer options */
101         struct atm_dev  *dev;           /* device back pointer */
102         struct atm_qos  qos;            /* QOS */
103         struct atm_sap  sap;            /* SAP */
104         void (*release_cb)(struct atm_vcc *vcc); /* release_sock callback */
105         void (*push)(struct atm_vcc *vcc,struct sk_buff *skb);
106         void (*pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* optional */
107         int (*push_oam)(struct atm_vcc *vcc,void *cell);
108         int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
109         void            *dev_data;      /* per-device data */
110         void            *proto_data;    /* per-protocol data */
111         struct k_atm_aal_stats *stats;  /* pointer to AAL stats group */
112         struct module *owner;           /* owner of ->push function */
113         /* SVC part --- may move later ------------------------------------- */
114         short           itf;            /* interface number */
115         struct sockaddr_atmsvc local;
116         struct sockaddr_atmsvc remote;
117         /* Multipoint part ------------------------------------------------- */
118         struct atm_vcc  *session;       /* session VCC descriptor */
119         /* Other stuff ----------------------------------------------------- */
120         void            *user_back;     /* user backlink - not touched by */
121                                         /* native ATM stack. Currently used */
122                                         /* by CLIP and sch_atm. */
123 };
124 
125 static inline struct atm_vcc *atm_sk(struct sock *sk)
126 {
127         return (struct atm_vcc *)sk;
128 }
129 
130 static inline struct atm_vcc *ATM_SD(struct socket *sock)
131 {
132         return atm_sk(sock->sk);
133 }
134 
135 static inline struct sock *sk_atm(struct atm_vcc *vcc)
136 {
137         return (struct sock *)vcc;
138 }
139 
140 struct atm_dev_addr {
141         struct sockaddr_atmsvc addr;    /* ATM address */
142         struct list_head entry;         /* next address */
143 };
144 
145 enum atm_addr_type_t { ATM_ADDR_LOCAL, ATM_ADDR_LECS };
146 
147 struct atm_dev {
148         const struct atmdev_ops *ops;   /* device operations; NULL if unused */
149         const struct atmphy_ops *phy;   /* PHY operations, may be undefined */
150                                         /* (NULL) */
151         const char      *type;          /* device type name */
152         int             number;         /* device index */
153         void            *dev_data;      /* per-device data */
154         void            *phy_data;      /* private PHY date */
155         unsigned long   flags;          /* device flags (ATM_DF_*) */
156         struct list_head local;         /* local ATM addresses */
157         struct list_head lecs;          /* LECS ATM addresses learned via ILMI */
158         unsigned char   esi[ESI_LEN];   /* ESI ("MAC" addr) */
159         struct atm_cirange ci_range;    /* VPI/VCI range */
160         struct k_atm_dev_stats stats;   /* statistics */
161         char            signal;         /* signal status (ATM_PHY_SIG_*) */
162         int             link_rate;      /* link rate (default: OC3) */
163         refcount_t      refcnt;         /* reference count */
164         spinlock_t      lock;           /* protect internal members */
165 #ifdef CONFIG_PROC_FS
166         struct proc_dir_entry *proc_entry; /* proc entry */
167         char *proc_name;                /* proc entry name */
168 #endif
169         struct device class_dev;        /* sysfs device */
170         struct list_head dev_list;      /* linkage */
171 };
172 
173  
174 /* OF: send_Oam Flags */
175 
176 #define ATM_OF_IMMED  1         /* Attempt immediate delivery */
177 #define ATM_OF_INRATE 2         /* Attempt in-rate delivery */
178 
179 
180 /*
181  * ioctl, getsockopt, and setsockopt are optional and can be set to NULL.
182  */
183 
184 struct atmdev_ops { /* only send is required */
185         void (*dev_close)(struct atm_dev *dev);
186         int (*open)(struct atm_vcc *vcc);
187         void (*close)(struct atm_vcc *vcc);
188         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
189 #ifdef CONFIG_COMPAT
190         int (*compat_ioctl)(struct atm_dev *dev,unsigned int cmd,
191                             void __user *arg);
192 #endif
193         int (*getsockopt)(struct atm_vcc *vcc,int level,int optname,
194             void __user *optval,int optlen);
195         int (*setsockopt)(struct atm_vcc *vcc,int level,int optname,
196             void __user *optval,unsigned int optlen);
197         int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
198         int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
199         void (*phy_put)(struct atm_dev *dev,unsigned char value,
200             unsigned long addr);
201         unsigned char (*phy_get)(struct atm_dev *dev,unsigned long addr);
202         int (*change_qos)(struct atm_vcc *vcc,struct atm_qos *qos,int flags);
203         int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
204         struct module *owner;
205 };
206 
207 struct atmphy_ops {
208         int (*start)(struct atm_dev *dev);
209         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
210         void (*interrupt)(struct atm_dev *dev);
211         int (*stop)(struct atm_dev *dev);
212 };
213 
214 struct atm_skb_data {
215         struct atm_vcc  *vcc;           /* ATM VCC */
216         unsigned long   atm_options;    /* ATM layer options */
217         unsigned int    acct_truesize;  /* truesize accounted to vcc */
218 };
219 
220 #define VCC_HTABLE_SIZE 32
221 
222 extern struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
223 extern rwlock_t vcc_sklist_lock;
224 
225 #define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
226 
227 struct atm_dev *atm_dev_register(const char *type, struct device *parent,
228                                  const struct atmdev_ops *ops,
229                                  int number, /* -1 == pick first available */
230                                  unsigned long *flags);
231 struct atm_dev *atm_dev_lookup(int number);
232 void atm_dev_deregister(struct atm_dev *dev);
233 
234 /* atm_dev_signal_change
235  *
236  * Propagate lower layer signal change in atm_dev->signal to netdevice.
237  * The event will be sent via a notifier call chain.
238  */
239 void atm_dev_signal_change(struct atm_dev *dev, char signal);
240 
241 void vcc_insert_socket(struct sock *sk);
242 
243 void atm_dev_release_vccs(struct atm_dev *dev);
244 
245 static inline void atm_account_tx(struct atm_vcc *vcc, struct sk_buff *skb)
246 {
247         /*
248          * Because ATM skbs may not belong to a sock (and we don't
249          * necessarily want to), skb->truesize may be adjusted,
250          * escaping the hack in pskb_expand_head() which avoids
251          * doing so for some cases. So stash the value of truesize
252          * at the time we accounted it, and atm_pop_raw() can use
253          * that value later, in case it changes.
254          */
255         refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
256         ATM_SKB(skb)->acct_truesize = skb->truesize;
257         ATM_SKB(skb)->atm_options = vcc->atm_options;
258 }
259 
260 static inline void atm_force_charge(struct atm_vcc *vcc,int truesize)
261 {
262         atomic_add(truesize, &sk_atm(vcc)->sk_rmem_alloc);
263 }
264 
265 
266 static inline void atm_return(struct atm_vcc *vcc,int truesize)
267 {
268         atomic_sub(truesize, &sk_atm(vcc)->sk_rmem_alloc);
269 }
270 
271 
272 static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
273 {
274         return (size + refcount_read(&sk_atm(vcc)->sk_wmem_alloc)) <
275                sk_atm(vcc)->sk_sndbuf;
276 }
277 
278 
279 static inline void atm_dev_hold(struct atm_dev *dev)
280 {
281         refcount_inc(&dev->refcnt);
282 }
283 
284 
285 static inline void atm_dev_put(struct atm_dev *dev)
286 {
287         if (refcount_dec_and_test(&dev->refcnt)) {
288                 BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
289                 if (dev->ops->dev_close)
290                         dev->ops->dev_close(dev);
291                 put_device(&dev->class_dev);
292         }
293 }
294 
295 
296 int atm_charge(struct atm_vcc *vcc,int truesize);
297 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
298     gfp_t gfp_flags);
299 int atm_pcr_goal(const struct atm_trafprm *tp);
300 
301 void vcc_release_async(struct atm_vcc *vcc, int reply);
302 
303 struct atm_ioctl {
304         struct module *owner;
305         /* A module reference is kept if appropriate over this call.
306          * Return -ENOIOCTLCMD if you don't handle it. */
307         int (*ioctl)(struct socket *, unsigned int cmd, unsigned long arg);
308         struct list_head list;
309 };
310 
311 /**
312  * register_atm_ioctl - register handler for ioctl operations
313  *
314  * Special (non-device) handlers of ioctl's should
315  * register here. If you're a normal device, you should
316  * set .ioctl in your atmdev_ops instead.
317  */
318 void register_atm_ioctl(struct atm_ioctl *);
319 
320 /**
321  * deregister_atm_ioctl - remove the ioctl handler
322  */
323 void deregister_atm_ioctl(struct atm_ioctl *);
324 
325 
326 /* register_atmdevice_notifier - register atm_dev notify events
327  *
328  * Clients like br2684 will register notify events
329  * Currently we notify of signal found/lost
330  */
331 int register_atmdevice_notifier(struct notifier_block *nb);
332 void unregister_atmdevice_notifier(struct notifier_block *nb);
333 
334 #endif
335 

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