xref: /linux-6.15/include/linux/atmdev.h (revision 6fa79bca)
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 <uapi/linux/atmdev.h>
15 
16 #ifdef CONFIG_PROC_FS
17 #include <linux/proc_fs.h>
18 
19 extern struct proc_dir_entry *atm_proc_root;
20 #endif
21 
22 #ifdef CONFIG_COMPAT
23 #include <linux/compat.h>
24 struct compat_atm_iobuf {
25 	int length;
26 	compat_uptr_t buffer;
27 };
28 #endif
29 
30 struct k_atm_aal_stats {
31 #define __HANDLE_ITEM(i) atomic_t i
32 	__AAL_STAT_ITEMS
33 #undef __HANDLE_ITEM
34 };
35 
36 
37 struct k_atm_dev_stats {
38 	struct k_atm_aal_stats aal0;
39 	struct k_atm_aal_stats aal34;
40 	struct k_atm_aal_stats aal5;
41 };
42 
43 struct device;
44 
45 enum {
46 	ATM_VF_ADDR,		/* Address is in use. Set by anybody, cleared
47 				   by device driver. */
48 	ATM_VF_READY,		/* VC is ready to transfer data. Set by device
49 				   driver, cleared by anybody. */
50 	ATM_VF_PARTIAL,		/* resources are bound to PVC (partial PVC
51 				   setup), controlled by socket layer */
52 	ATM_VF_REGIS,		/* registered with demon, controlled by SVC
53 				   socket layer */
54 	ATM_VF_BOUND,		/* local SAP is set, controlled by SVC socket
55 				   layer */
56 	ATM_VF_RELEASED,	/* demon has indicated/requested release,
57 				   controlled by SVC socket layer */
58 	ATM_VF_HASQOS,		/* QOS parameters have been set */
59 	ATM_VF_LISTEN,		/* socket is used for listening */
60 	ATM_VF_META,		/* SVC socket isn't used for normal data
61 				   traffic and doesn't depend on signaling
62 				   to be available */
63 	ATM_VF_SESSION,		/* VCC is p2mp session control descriptor */
64 	ATM_VF_HASSAP,		/* SAP has been set */
65 	ATM_VF_CLOSE,		/* asynchronous close - treat like VF_RELEASED*/
66 	ATM_VF_WAITING,		/* waiting for reply from sigd */
67 	ATM_VF_IS_CLIP,		/* in use by CLIP protocol */
68 };
69 
70 
71 #define ATM_VF2VS(flags) \
72     (test_bit(ATM_VF_READY,&(flags)) ? ATM_VS_CONNECTED : \
73      test_bit(ATM_VF_RELEASED,&(flags)) ? ATM_VS_CLOSING : \
74      test_bit(ATM_VF_LISTEN,&(flags)) ? ATM_VS_LISTEN : \
75      test_bit(ATM_VF_REGIS,&(flags)) ? ATM_VS_INUSE : \
76      test_bit(ATM_VF_BOUND,&(flags)) ? ATM_VS_BOUND : ATM_VS_IDLE)
77 
78 
79 enum {
80 	ATM_DF_REMOVED,		/* device was removed from atm_devs list */
81 };
82 
83 
84 #define ATM_PHY_SIG_LOST    0	/* no carrier/light */
85 #define ATM_PHY_SIG_UNKNOWN 1	/* carrier/light status is unknown */
86 #define ATM_PHY_SIG_FOUND   2	/* carrier/light okay */
87 
88 #define ATM_ATMOPT_CLP	1	/* set CLP bit */
89 
90 struct atm_vcc {
91 	/* struct sock has to be the first member of atm_vcc */
92 	struct sock	sk;
93 	unsigned long	flags;		/* VCC flags (ATM_VF_*) */
94 	short		vpi;		/* VPI and VCI (types must be equal */
95 					/* with sockaddr) */
96 	int 		vci;
97 	unsigned long	aal_options;	/* AAL layer options */
98 	unsigned long	atm_options;	/* ATM layer options */
99 	struct atm_dev	*dev;		/* device back pointer */
100 	struct atm_qos	qos;		/* QOS */
101 	struct atm_sap	sap;		/* SAP */
102 	void (*push)(struct atm_vcc *vcc,struct sk_buff *skb);
103 	void (*pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* optional */
104 	int (*push_oam)(struct atm_vcc *vcc,void *cell);
105 	int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
106 	void		*dev_data;	/* per-device data */
107 	void		*proto_data;	/* per-protocol data */
108 	struct k_atm_aal_stats *stats;	/* pointer to AAL stats group */
109 	/* SVC part --- may move later ------------------------------------- */
110 	short		itf;		/* interface number */
111 	struct sockaddr_atmsvc local;
112 	struct sockaddr_atmsvc remote;
113 	/* Multipoint part ------------------------------------------------- */
114 	struct atm_vcc	*session;	/* session VCC descriptor */
115 	/* Other stuff ----------------------------------------------------- */
116 	void		*user_back;	/* user backlink - not touched by */
117 					/* native ATM stack. Currently used */
118 					/* by CLIP and sch_atm. */
119 };
120 
121 static inline struct atm_vcc *atm_sk(struct sock *sk)
122 {
123 	return (struct atm_vcc *)sk;
124 }
125 
126 static inline struct atm_vcc *ATM_SD(struct socket *sock)
127 {
128 	return atm_sk(sock->sk);
129 }
130 
131 static inline struct sock *sk_atm(struct atm_vcc *vcc)
132 {
133 	return (struct sock *)vcc;
134 }
135 
136 struct atm_dev_addr {
137 	struct sockaddr_atmsvc addr;	/* ATM address */
138 	struct list_head entry;		/* next address */
139 };
140 
141 enum atm_addr_type_t { ATM_ADDR_LOCAL, ATM_ADDR_LECS };
142 
143 struct atm_dev {
144 	const struct atmdev_ops *ops;	/* device operations; NULL if unused */
145 	const struct atmphy_ops *phy;	/* PHY operations, may be undefined */
146 					/* (NULL) */
147 	const char	*type;		/* device type name */
148 	int		number;		/* device index */
149 	void		*dev_data;	/* per-device data */
150 	void		*phy_data;	/* private PHY date */
151 	unsigned long	flags;		/* device flags (ATM_DF_*) */
152 	struct list_head local;		/* local ATM addresses */
153 	struct list_head lecs;		/* LECS ATM addresses learned via ILMI */
154 	unsigned char	esi[ESI_LEN];	/* ESI ("MAC" addr) */
155 	struct atm_cirange ci_range;	/* VPI/VCI range */
156 	struct k_atm_dev_stats stats;	/* statistics */
157 	char		signal;		/* signal status (ATM_PHY_SIG_*) */
158 	int		link_rate;	/* link rate (default: OC3) */
159 	atomic_t	refcnt;		/* reference count */
160 	spinlock_t	lock;		/* protect internal members */
161 #ifdef CONFIG_PROC_FS
162 	struct proc_dir_entry *proc_entry; /* proc entry */
163 	char *proc_name;		/* proc entry name */
164 #endif
165 	struct device class_dev;	/* sysfs device */
166 	struct list_head dev_list;	/* linkage */
167 };
168 
169 
170 /* OF: send_Oam Flags */
171 
172 #define ATM_OF_IMMED  1		/* Attempt immediate delivery */
173 #define ATM_OF_INRATE 2		/* Attempt in-rate delivery */
174 
175 
176 /*
177  * ioctl, getsockopt, and setsockopt are optional and can be set to NULL.
178  */
179 
180 struct atmdev_ops { /* only send is required */
181 	void (*dev_close)(struct atm_dev *dev);
182 	int (*open)(struct atm_vcc *vcc);
183 	void (*close)(struct atm_vcc *vcc);
184 	int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
185 #ifdef CONFIG_COMPAT
186 	int (*compat_ioctl)(struct atm_dev *dev,unsigned int cmd,
187 			    void __user *arg);
188 #endif
189 	int (*getsockopt)(struct atm_vcc *vcc,int level,int optname,
190 	    void __user *optval,int optlen);
191 	int (*setsockopt)(struct atm_vcc *vcc,int level,int optname,
192 	    void __user *optval,unsigned int optlen);
193 	int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
194 	int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
195 	void (*phy_put)(struct atm_dev *dev,unsigned char value,
196 	    unsigned long addr);
197 	unsigned char (*phy_get)(struct atm_dev *dev,unsigned long addr);
198 	int (*change_qos)(struct atm_vcc *vcc,struct atm_qos *qos,int flags);
199 	int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
200 	struct module *owner;
201 };
202 
203 struct atmphy_ops {
204 	int (*start)(struct atm_dev *dev);
205 	int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
206 	void (*interrupt)(struct atm_dev *dev);
207 	int (*stop)(struct atm_dev *dev);
208 };
209 
210 struct atm_skb_data {
211 	struct atm_vcc	*vcc;		/* ATM VCC */
212 	unsigned long	atm_options;	/* ATM layer options */
213 };
214 
215 #define VCC_HTABLE_SIZE 32
216 
217 extern struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
218 extern rwlock_t vcc_sklist_lock;
219 
220 #define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
221 
222 struct atm_dev *atm_dev_register(const char *type, struct device *parent,
223 				 const struct atmdev_ops *ops,
224 				 int number, /* -1 == pick first available */
225 				 unsigned long *flags);
226 struct atm_dev *atm_dev_lookup(int number);
227 void atm_dev_deregister(struct atm_dev *dev);
228 
229 /* atm_dev_signal_change
230  *
231  * Propagate lower layer signal change in atm_dev->signal to netdevice.
232  * The event will be sent via a notifier call chain.
233  */
234 void atm_dev_signal_change(struct atm_dev *dev, char signal);
235 
236 void vcc_insert_socket(struct sock *sk);
237 
238 void atm_dev_release_vccs(struct atm_dev *dev);
239 
240 
241 static inline void atm_force_charge(struct atm_vcc *vcc,int truesize)
242 {
243 	atomic_add(truesize, &sk_atm(vcc)->sk_rmem_alloc);
244 }
245 
246 
247 static inline void atm_return(struct atm_vcc *vcc,int truesize)
248 {
249 	atomic_sub(truesize, &sk_atm(vcc)->sk_rmem_alloc);
250 }
251 
252 
253 static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
254 {
255 	return (size + atomic_read(&sk_atm(vcc)->sk_wmem_alloc)) <
256 	       sk_atm(vcc)->sk_sndbuf;
257 }
258 
259 
260 static inline void atm_dev_hold(struct atm_dev *dev)
261 {
262 	atomic_inc(&dev->refcnt);
263 }
264 
265 
266 static inline void atm_dev_put(struct atm_dev *dev)
267 {
268 	if (atomic_dec_and_test(&dev->refcnt)) {
269 		BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
270 		if (dev->ops->dev_close)
271 			dev->ops->dev_close(dev);
272 		put_device(&dev->class_dev);
273 	}
274 }
275 
276 
277 int atm_charge(struct atm_vcc *vcc,int truesize);
278 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
279     gfp_t gfp_flags);
280 int atm_pcr_goal(const struct atm_trafprm *tp);
281 
282 void vcc_release_async(struct atm_vcc *vcc, int reply);
283 
284 struct atm_ioctl {
285 	struct module *owner;
286 	/* A module reference is kept if appropriate over this call.
287 	 * Return -ENOIOCTLCMD if you don't handle it. */
288 	int (*ioctl)(struct socket *, unsigned int cmd, unsigned long arg);
289 	struct list_head list;
290 };
291 
292 /**
293  * register_atm_ioctl - register handler for ioctl operations
294  *
295  * Special (non-device) handlers of ioctl's should
296  * register here. If you're a normal device, you should
297  * set .ioctl in your atmdev_ops instead.
298  */
299 void register_atm_ioctl(struct atm_ioctl *);
300 
301 /**
302  * deregister_atm_ioctl - remove the ioctl handler
303  */
304 void deregister_atm_ioctl(struct atm_ioctl *);
305 
306 
307 /* register_atmdevice_notifier - register atm_dev notify events
308  *
309  * Clients like br2684 will register notify events
310  * Currently we notify of signal found/lost
311  */
312 int register_atmdevice_notifier(struct notifier_block *nb);
313 void unregister_atmdevice_notifier(struct notifier_block *nb);
314 
315 #endif
316