include/net/iucv/iucv.h

   1 /*
   2  *  drivers/s390/net/iucv.h
   3  *    IUCV base support.
   4  *
   5  *  S390 version
   6  *    Copyright 2000, 2006 IBM Corporation
   7  *    Author(s):Alan Altmark (Alan_Altmark@us.ibm.com)
   8  *              Xenia Tkatschow (xenia@us.ibm.com)
   9  *    Rewritten for af_iucv:
  10  *      Martin Schwidefsky <schwidefsky@de.ibm.com>
  11  *
  12  *
  13  * Functionality:
  14  * To explore any of the IUCV functions, one must first register their
  15  * program using iucv_register(). Once your program has successfully
  16  * completed a register, it can exploit the other functions.
  17  * For furthur reference on all IUCV functionality, refer to the
  18  * CP Programming Services book, also available on the web thru
  19  * www.vm.ibm.com/pubs, manual # SC24-6084
  20  *
  21  * Definition of Return Codes
  22  * - All positive return codes including zero are reflected back
  23  *   from CP. The definition of each return code can be found in
  24  *   CP Programming Services book.
  25  * - Return Code of:
  26  *   -EINVAL: Invalid value
  27  *   -ENOMEM: storage allocation failed
  28  */
  29
  30 #include <linux/types.h>
  31 #include <asm/debug.h>
  32
  33 /*
  34  * IUCV option flags usable by device drivers:
  35  *
  36  * IUCV_IPRMDATA  Indicates that your program can handle a message in the
  37  *                parameter list / a message is sent in the parameter list.
  38  *                Used for iucv_path_accept, iucv_path_connect,
  39  *                iucv_message_reply, iucv_message_send, iucv_message_send2way.
  40  * IUCV_IPQUSCE   Indicates that you do not want to receive messages on this
  41  *                path until an iucv_path_resume is issued.
  42  *                Used for iucv_path_accept, iucv_path_connect.
  43  * IUCV_IPBUFLST  Indicates that an address list is used for the message data.
  44  *                Used for iucv_message_receive, iucv_message_send,
  45  *                iucv_message_send2way.
  46  * IUCV_IPPRTY    Specifies that you want to send priority messages.
  47  *                Used for iucv_path_accept, iucv_path_connect,
  48  *                iucv_message_reply, iucv_message_send, iucv_message_send2way.
  49  * IUCV_IPSYNC    Indicates a synchronous send request.
  50  *                Used for iucv_message_send, iucv_message_send2way.
  51  * IUCV_IPANSLST  Indicates that an address list is used for the reply data.
  52  *                Used for iucv_message_reply, iucv_message_send2way.
  53  * IUCV_IPLOCAL   Specifies that the communication partner has to be on the
  54  *                local system. If local is specified no target class can be
  55  *                specified.
  56  *                Used for iucv_path_connect.
  57  *
  58  * All flags are defined in the input field IPFLAGS1 of each function
  59  * and can be found in CP Programming Services.
  60  */
  61 #define IUCV_IPRMDATA   0x80
  62 #define IUCV_IPQUSCE    0x40
  63 #define IUCV_IPBUFLST   0x40
  64 #define IUCV_IPPRTY     0x20
  65 #define IUCV_IPANSLST   0x08
  66 #define IUCV_IPSYNC     0x04
  67 #define IUCV_IPLOCAL    0x01
  68
  69 /*
  70  * iucv_array : Defines buffer array.
  71  * Inside the array may be 31- bit addresses and 31-bit lengths.
  72  * Use a pointer to an iucv_array as the buffer, reply or answer
  73  * parameter on iucv_message_send, iucv_message_send2way, iucv_message_receive
  74  * and iucv_message_reply if IUCV_IPBUFLST or IUCV_IPANSLST are used.
  75  */
  76 struct iucv_array {
  77         u32 address;
  78         u32 length;
  79 } __attribute__ ((aligned (8)));
  80
  81 extern struct bus_type iucv_bus;
  82 extern struct device *iucv_root;
  83
  84 /*
  85  * struct iucv_path
  86  * pathid: 16 bit path identification
  87  * msglim: 16 bit message limit
  88  * flags: properties of the path: IPRMDATA, IPQUSCE, IPPRTY
  89  * handler:  address of iucv handler structure
  90  * private: private information of the handler associated with the path
  91  * list: list_head for the iucv_handler path list.
  92  */
  93 struct iucv_path {
  94         u16 pathid;
  95         u16 msglim;
  96         u8  flags;
  97         void *private;
  98         struct iucv_handler *handler;
  99         struct list_head list;
 100 };
 101
 102 /*
 103  * struct iucv_message
 104  * id: 32 bit message id
 105  * audit: 32 bit error information of purged or replied messages
 106  * class: 32 bit target class of a message (source class for replies)
 107  * tag: 32 bit tag to be associated with the message
 108  * length: 32 bit length of the message / reply
 109  * reply_size: 32 bit maximum allowed length of the reply
 110  * rmmsg: 8 byte inline message
 111  * flags: message properties (IUCV_IPPRTY)
 112  */
 113 struct iucv_message {
 114         u32 id;
 115         u32 audit;
 116         u32 class;
 117         u32 tag;
 118         u32 length;
 119         u32 reply_size;
 120         u8  rmmsg[8];
 121         u8  flags;
 122 };
 123
 124 /*
 125  * struct iucv_handler
 126  *
 127  * A vector of functions that handle IUCV interrupts. Each functions gets
 128  * a parameter area as defined by the CP Programming Services and private
 129  * pointer that is provided by the user of the interface.
 130  */
 131 struct iucv_handler {
 132          /*
 133           * The path_pending function is called after an iucv interrupt
 134           * type 0x01 has been received. The base code allocates a path
 135           * structure and "asks" the handler if this path belongs to the
 136           * handler. To accept the path the path_pending function needs
 137           * to call iucv_path_accept and return 0. If the callback returns
 138           * a value != 0 the iucv base code will continue with the next
 139           * handler. The order in which the path_pending functions are
 140           * called is the order of the registration of the iucv handlers
 141           * to the base code.
 142           */
 143         int  (*path_pending)(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
 144         /*
 145          * The path_complete function is called after an iucv interrupt
 146          * type 0x02 has been received for a path that has been established
 147          * for this handler with iucv_path_connect and got accepted by the
 148          * peer with iucv_path_accept.
 149          */
 150         void (*path_complete)(struct iucv_path *, u8 ipuser[16]);
 151          /*
 152           * The path_severed function is called after an iucv interrupt
 153           * type 0x03 has been received. The communication peer shutdown
 154           * his end of the communication path. The path still exists and
 155           * remaining messages can be received until a iucv_path_sever
 156           * shuts down the other end of the path as well.
 157           */
 158         void (*path_severed)(struct iucv_path *, u8 ipuser[16]);
 159         /*
 160          * The path_quiesced function is called after an icuv interrupt
 161          * type 0x04 has been received. The communication peer has quiesced
 162          * the path. Delivery of messages is stopped until iucv_path_resume
 163          * has been called.
 164          */
 165         void (*path_quiesced)(struct iucv_path *, u8 ipuser[16]);
 166         /*
 167          * The path_resumed function is called after an icuv interrupt
 168          * type 0x05 has been received. The communication peer has resumed
 169          * the path.
 170          */
 171         void (*path_resumed)(struct iucv_path *, u8 ipuser[16]);
 172         /*
 173          * The message_pending function is called after an icuv interrupt
 174          * type 0x06 or type 0x07 has been received. A new message is
 175          * availabe and can be received with iucv_message_receive.
 176          */
 177         void (*message_pending)(struct iucv_path *, struct iucv_message *);
 178         /*
 179          * The message_complete function is called after an icuv interrupt
 180          * type 0x08 or type 0x09 has been received. A message send with
 181          * iucv_message_send2way has been replied to. The reply can be
 182          * received with iucv_message_receive.
 183          */
 184         void (*message_complete)(struct iucv_path *, struct iucv_message *);
 185
 186         struct list_head list;
 187         struct list_head paths;
 188 };
 189
 190 /**
 191  * iucv_register:
 192  * @handler: address of iucv handler structure
 193  * @smp: != 0 indicates that the handler can deal with out of order messages
 194  *
 195  * Registers a driver with IUCV.
 196  *
 197  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 198  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 199  */
 200 int iucv_register(struct iucv_handler *handler, int smp);
 201
 202 /**
 203  * iucv_unregister
 204  * @handler:  address of iucv handler structure
 205  * @smp: != 0 indicates that the handler can deal with out of order messages
 206  *
 207  * Unregister driver from IUCV.
 208  */
 209 void iucv_unregister(struct iucv_handler *handle, int smp);
 210
 211 /**
 212  * iucv_path_alloc
 213  * @msglim: initial message limit
 214  * @flags: initial flags
 215  * @gfp: kmalloc allocation flag
 216  *
 217  * Allocate a new path structure for use with iucv_connect.
 218  *
 219  * Returns NULL if the memory allocation failed or a pointer to the
 220  * path structure.
 221  */
 222 static inline struct iucv_path *iucv_path_alloc(u16 msglim, u8 flags, gfp_t gfp)
 223 {
 224         struct iucv_path *path;
 225
 226         path = kzalloc(sizeof(struct iucv_path), gfp);
 227         if (path) {
 228                 path->msglim = msglim;
 229                 path->flags = flags;
 230         }
 231         return path;
 232 }
 233
 234 /**
 235  * iucv_path_free
 236  * @path: address of iucv path structure
 237  *
 238  * Frees a path structure.
 239  */
 240 static inline void iucv_path_free(struct iucv_path *path)
 241 {
 242         kfree(path);
 243 }
 244
 245 /**
 246  * iucv_path_accept
 247  * @path: address of iucv path structure
 248  * @handler: address of iucv handler structure
 249  * @userdata: 16 bytes of data reflected to the communication partner
 250  * @private: private data passed to interrupt handlers for this path
 251  *
 252  * This function is issued after the user received a connection pending
 253  * external interrupt and now wishes to complete the IUCV communication path.
 254  *
 255  * Returns the result of the CP IUCV call.
 256  */
 257 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 258                      u8 userdata[16], void *private);
 259
 260 /**
 261  * iucv_path_connect
 262  * @path: address of iucv path structure
 263  * @handler: address of iucv handler structure
 264  * @userid: 8-byte user identification
 265  * @system: 8-byte target system identification
 266  * @userdata: 16 bytes of data reflected to the communication partner
 267  * @private: private data passed to interrupt handlers for this path
 268  *
 269  * This function establishes an IUCV path. Although the connect may complete
 270  * successfully, you are not able to use the path until you receive an IUCV
 271  * Connection Complete external interrupt.
 272  *
 273  * Returns the result of the CP IUCV call.
 274  */
 275 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 276                       u8 userid[8], u8 system[8], u8 userdata[16],
 277                       void *private);
 278
 279 /**
 280  * iucv_path_quiesce:
 281  * @path: address of iucv path structure
 282  * @userdata: 16 bytes of data reflected to the communication partner
 283  *
 284  * This function temporarily suspends incoming messages on an IUCV path.
 285  * You can later reactivate the path by invoking the iucv_resume function.
 286  *
 287  * Returns the result from the CP IUCV call.
 288  */
 289 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16]);
 290
 291 /**
 292  * iucv_path_resume:
 293  * @path: address of iucv path structure
 294  * @userdata: 16 bytes of data reflected to the communication partner
 295  *
 296  * This function resumes incoming messages on an IUCV path that has
 297  * been stopped with iucv_path_quiesce.
 298  *
 299  * Returns the result from the CP IUCV call.
 300  */
 301 int iucv_path_resume(struct iucv_path *path, u8 userdata[16]);
 302
 303 /**
 304  * iucv_path_sever
 305  * @path: address of iucv path structure
 306  * @userdata: 16 bytes of data reflected to the communication partner
 307  *
 308  * This function terminates an IUCV path.
 309  *
 310  * Returns the result from the CP IUCV call.
 311  */
 312 int iucv_path_sever(struct iucv_path *path, u8 userdata[16]);
 313
 314 /**
 315  * iucv_message_purge
 316  * @path: address of iucv path structure
 317  * @msg: address of iucv msg structure
 318  * @srccls: source class of message
 319  *
 320  * Cancels a message you have sent.
 321  *
 322  * Returns the result from the CP IUCV call.
 323  */
 324 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
 325                        u32 srccls);
 326
 327 /**
 328  * iucv_message_receive
 329  * @path: address of iucv path structure
 330  * @msg: address of iucv msg structure
 331  * @flags: flags that affect how the message is received (IUCV_IPBUFLST)
 332  * @buffer: address of data buffer or address of struct iucv_array
 333  * @size: length of data buffer
 334  * @residual:
 335  *
 336  * This function receives messages that are being sent to you over
 337  * established paths. This function will deal with RMDATA messages
 338  * embedded in struct iucv_message as well.
 339  *
 340  * Locking:     local_bh_enable/local_bh_disable
 341  *
 342  * Returns the result from the CP IUCV call.
 343  */
 344 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 345                          u8 flags, void *buffer, size_t size, size_t *residual);
 346
 347 /**
 348  * __iucv_message_receive
 349  * @path: address of iucv path structure
 350  * @msg: address of iucv msg structure
 351  * @flags: flags that affect how the message is received (IUCV_IPBUFLST)
 352  * @buffer: address of data buffer or address of struct iucv_array
 353  * @size: length of data buffer
 354  * @residual:
 355  *
 356  * This function receives messages that are being sent to you over
 357  * established paths. This function will deal with RMDATA messages
 358  * embedded in struct iucv_message as well.
 359  *
 360  * Locking:     no locking.
 361  *
 362  * Returns the result from the CP IUCV call.
 363  */
 364 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 365                            u8 flags, void *buffer, size_t size,
 366                            size_t *residual);
 367
 368 /**
 369  * iucv_message_reject
 370  * @path: address of iucv path structure
 371  * @msg: address of iucv msg structure
 372  *
 373  * The reject function refuses a specified message. Between the time you
 374  * are notified of a message and the time that you complete the message,
 375  * the message may be rejected.
 376  *
 377  * Returns the result from the CP IUCV call.
 378  */
 379 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg);
 380
 381 /**
 382  * iucv_message_reply
 383  * @path: address of iucv path structure
 384  * @msg: address of iucv msg structure
 385  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 386  * @reply: address of data buffer or address of struct iucv_array
 387  * @size: length of reply data buffer
 388  *
 389  * This function responds to the two-way messages that you receive. You
 390  * must identify completely the message to which you wish to reply. ie,
 391  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
 392  * the parameter list.
 393  *
 394  * Returns the result from the CP IUCV call.
 395  */
 396 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
 397                        u8 flags, void *reply, size_t size);
 398
 399 /**
 400  * iucv_message_send
 401  * @path: address of iucv path structure
 402  * @msg: address of iucv msg structure
 403  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 404  * @srccls: source class of message
 405  * @buffer: address of data buffer or address of struct iucv_array
 406  * @size: length of send buffer
 407  *
 408  * This function transmits data to another application. Data to be
 409  * transmitted is in a buffer and this is a one-way message and the
 410  * receiver will not reply to the message.
 411  *
 412  * Locking:     local_bh_enable/local_bh_disable
 413  *
 414  * Returns the result from the CP IUCV call.
 415  */
 416 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
 417                       u8 flags, u32 srccls, void *buffer, size_t size);
 418
 419 /**
 420  * __iucv_message_send
 421  * @path: address of iucv path structure
 422  * @msg: address of iucv msg structure
 423  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 424  * @srccls: source class of message
 425  * @buffer: address of data buffer or address of struct iucv_array
 426  * @size: length of send buffer
 427  *
 428  * This function transmits data to another application. Data to be
 429  * transmitted is in a buffer and this is a one-way message and the
 430  * receiver will not reply to the message.
 431  *
 432  * Locking:     no locking.
 433  *
 434  * Returns the result from the CP IUCV call.
 435  */
 436 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
 437                         u8 flags, u32 srccls, void *buffer, size_t size);
 438
 439 /**
 440  * iucv_message_send2way
 441  * @path: address of iucv path structure
 442  * @msg: address of iucv msg structure
 443  * @flags: how the message is sent and the reply is received
 444  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
 445  * @srccls: source class of message
 446  * @buffer: address of data buffer or address of struct iucv_array
 447  * @size: length of send buffer
 448  * @ansbuf: address of answer buffer or address of struct iucv_array
 449  * @asize: size of reply buffer
 450  *
 451  * This function transmits data to another application. Data to be
 452  * transmitted is in a buffer. The receiver of the send is expected to
 453  * reply to the message and a buffer is provided into which IUCV moves
 454  * the reply to this message.
 455  *
 456  * Returns the result from the CP IUCV call.
 457  */
 458 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
 459                           u8 flags, u32 srccls, void *buffer, size_t size,
 460                           void *answer, size_t asize, size_t *residual);