2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
25 /** Libmemif version. */
26 #define LIBMEMIF_VERSION "2.0"
27 /** Default name of application using libmemif. */
28 #define MEMIF_DEFAULT_APP_NAME "libmemif-app"
35 MEMIF_ERR_SUCCESS = 0, /*!< success */
37 MEMIF_ERR_SYSCALL, /*!< other syscall error */
38 MEMIF_ERR_ACCES, /*!< permission denied */
39 MEMIF_ERR_NO_FILE, /*!< file does not exist */
40 MEMIF_ERR_FILE_LIMIT, /*!< system open file limit */
41 MEMIF_ERR_PROC_FILE_LIMIT, /*!< process open file limit */
42 MEMIF_ERR_ALREADY, /*!< connection already requested */
43 MEMIF_ERR_AGAIN, /*!< fd is not socket, or operation would block */
44 MEMIF_ERR_BAD_FD, /*!< invalid fd */
45 MEMIF_ERR_NOMEM, /*!< out of memory */
47 MEMIF_ERR_INVAL_ARG, /*!< invalid argument */
48 MEMIF_ERR_NOCONN, /*!< handle points to no connection */
49 MEMIF_ERR_CONN, /*!< handle points to existing connection */
50 MEMIF_ERR_CB_FDUPDATE, /*!< user defined callback memif_control_fd_update_t error */
51 MEMIF_ERR_FILE_NOT_SOCK, /*!< file specified by socket filename
52 exists, but it's not socket */
53 MEMIF_ERR_NO_SHMFD, /*!< missing shm fd */
54 MEMIF_ERR_COOKIE, /*!< wrong cookie on ring */
55 MEMIF_ERR_NOBUF_RING, /*!< ring buffer full */
56 MEMIF_ERR_NOBUF, /*!< not enough memif buffers */
57 MEMIF_ERR_NOBUF_DET, /*!< memif details needs larger buffer */
58 MEMIF_ERR_INT_WRITE, /*!< send interrupt error */
59 MEMIF_ERR_MFMSG, /*!< malformed msg received */
60 MEMIF_ERR_QID, /*!< invalid queue id */
61 /* MEMIF PROTO ERRORS */
62 MEMIF_ERR_PROTO, /*!< incompatible protocol version */
63 MEMIF_ERR_ID, /*!< unmatched interface id */
64 MEMIF_ERR_ACCSLAVE, /*!< slave cannot accept connection requests */
65 MEMIF_ERR_ALRCONN, /*!< memif is already connected */
66 MEMIF_ERR_MODE, /*!< mode mismatch */
67 MEMIF_ERR_SECRET, /*!< secret mismatch */
68 MEMIF_ERR_NOSECRET, /*!< secret required */
69 MEMIF_ERR_MAXREG, /*!< max region limit reached */
70 MEMIF_ERR_MAXRING, /*!< max ring limit reached */
71 MEMIF_ERR_NO_INTFD, /*!< missing interrupt fd */
72 MEMIF_ERR_DISCONNECT, /*!< disconenct received */
73 MEMIF_ERR_DISCONNECTED, /*!< peer interface disconnected */
74 MEMIF_ERR_UNKNOWN_MSG, /*!< unknown message type */
75 MEMIF_ERR_POLL_CANCEL, /*!< memif_poll_event() was cancelled */
76 MEMIF_ERR_MAX_RING, /*!< too large ring size */
77 MEMIF_ERR_PRIVHDR, /*!< private hdrs not supported */
81 * @defgroup MEMIF_FD_EVENT Types of events that need to be watched for specific fd.
86 /** user needs to set events that occured on fd and pass them to memif_control_fd_handler */
87 #define MEMIF_FD_EVENT_READ (1 << 0)
88 #define MEMIF_FD_EVENT_WRITE (1 << 1)
89 /** inform libmemif that error occured on fd */
90 #define MEMIF_FD_EVENT_ERROR (1 << 2)
91 /** if set, informs that fd is going to be closed (user may want to stop watching for events on this fd) */
92 #define MEMIF_FD_EVENT_DEL (1 << 3)
94 #define MEMIF_FD_EVENT_MOD (1 << 4)
97 /** \brief Memif connection handle
98 pointer of type void, pointing to internal structure
100 typedef void *memif_conn_handle_t;
102 /** \brief Memif allocator alloc
103 @param size - requested allocation size
105 custom memory allocator: alloc function template
107 typedef void *(memif_alloc_t) (size_t size);
110 /** \brief Memif realloc
111 @param ptr - pointer to memory block
112 @param size - requested allocation size
114 custom memory reallocation
116 typedef void *(memif_realloc_t) (void *ptr, size_t size);
118 /** \brief Memif allocator free
119 @param size - requested allocation size
121 custom memory allocator: free function template
123 typedef void (memif_free_t) (void *ptr);
126 * @defgroup CALLBACKS Callback functions definitions
132 /** \brief Memif control file descriptor update (callback function)
133 @param fd - new file descriptor to watch
134 @param events - event type(s) to watch for
136 This callback is called when there is new fd to watch for events on
137 or if fd is about to be closed (user mey want to stop watching for events on this fd).
139 typedef int (memif_control_fd_update_t) (int fd, uint8_t events);
141 /** \brief Memif connection status update (callback function)
142 @param conn - memif connection handle
143 @param private_ctx - private context
145 Informs user about connection status connected/disconnected.
146 On connected -> start watching for events on interrupt fd (optional).
148 typedef int (memif_connection_update_t) (memif_conn_handle_t conn,
151 /** \brief Memif interrupt occured (callback function)
152 @param conn - memif connection handle
153 @param private_ctx - private context
154 @param qid - queue id on which interrupt occured
156 Called when event is received on interrupt fd.
158 typedef int (memif_interrupt_t) (memif_conn_handle_t conn, void *private_ctx,
164 * @defgroup EXTERNAL_REGION External region APIs
170 /** \brief Get external buffer offset (optional)
171 @param private_ctx - private context
173 Find unallocated external buffer and return its offset.
175 typedef uint32_t (memif_get_external_buffer_offset_t) (void *private_ctx);
177 /** \brief Add external region
178 @param[out] addr - region address
179 @param size - requested region size
180 @param fd[out] - file descriptor
181 @param private_ctx - private context
183 Called by slave. Add external region created by client.
185 typedef int (memif_add_external_region_t) (void * *addr, uint32_t size,
186 int *fd, void *private_ctx);
188 /** \brief Get external region address
189 @param size - requested region size
190 @param fd - file descriptor
191 @param private_ctx - private context
193 Called by master. Get region address from client.
195 \return region address
197 typedef void *(memif_get_external_region_addr_t) (uint32_t size, int fd,
200 /** \brief Delete external region
201 @param addr - region address
202 @param size - region size
203 @param fd - file descriptor
204 @param private_ctx - private context
206 Delete external region.
208 typedef int (memif_del_external_region_t) (void *addr, uint32_t size, int fd,
211 /** \brief Register external region
212 @param ar - add external region callback
213 @param gr - get external region addr callback
214 @param dr - delete external region callback
215 @param go - get external buffer offset callback (optional)
217 void memif_register_external_region (memif_add_external_region_t * ar,
218 memif_get_external_region_addr_t * gr,
219 memif_del_external_region_t * dr,
220 memif_get_external_buffer_offset_t * go);
225 * @defgroup ARGS_N_BUFS Connection arguments and buffers
234 MEMIF_INTERFACE_MODE_ETHERNET = 0,
235 MEMIF_INTERFACE_MODE_IP = 1,
236 MEMIF_INTERFACE_MODE_PUNT_INJECT = 2,
237 } memif_interface_mode_t;
238 #endif /* _MEMIF_H_ */
240 /** \brief Memif connection arguments
241 @param socket_filename - socket filename
242 @param secret - otional parameter used as interface autenthication
243 @param num_s2m_rings - number of slave to master rings
244 @param num_m2s_rings - number of master to slave rings
245 @param buffer_size - size of buffer in shared memory
246 @param log2_ring_size - logarithm base 2 of ring size
247 @param is_master - 0 == master, 1 == slave
248 @param interface_id - id used to identify peer connection
249 @param interface_name - interface name
250 @param mode - 0 == ethernet, 1 == ip , 2 == punt/inject
254 uint8_t *socket_filename; /*!< default = /run/vpp/memif.sock */
255 uint8_t secret[24]; /*!< optional (interface authentication) */
257 uint8_t num_s2m_rings; /*!< default = 1 */
258 uint8_t num_m2s_rings; /*!< default = 1 */
259 uint16_t buffer_size; /*!< default = 2048 */
260 uint8_t log2_ring_size; /*!< default = 10 (1024) */
263 uint32_t interface_id;
264 uint8_t interface_name[32];
265 memif_interface_mode_t mode:8;
268 /*! memif receive mode */
271 MEMIF_RX_MODE_INTERRUPT = 0, /*!< interrupt mode */
272 MEMIF_RX_MODE_POLLING /*!< polling mode */
275 /** \brief Memif buffer
276 @param desc_index - ring descriptor index
277 @param ring - pointer to ring containing descriptor for this buffer
278 @param len - available length
279 @param flags - memif buffer flags
280 @param data - pointer to shared memory data
287 /** next buffer present (chained buffers) */
288 #define MEMIF_BUFFER_FLAG_NEXT (1 << 0)
289 /** states that buffer is from rx ring */
290 #define MEMIF_BUFFER_FLAG_RX (1 << 1)
297 * @defgroup MEMIF_DETAILS Memif details structs
303 /** \brief Memif queue details
304 @param region - region index
305 @param qid - queue id
306 @param ring_size - size of ring buffer in sharem memory
307 @param flags - ring flags
308 @param head - ring head pointer
309 @param tail - ring tail pointer
310 @param buffer_size - buffer size on sharem memory
317 /** if set queue is in polling mode, else in interrupt mode */
318 #define MEMIF_QUEUE_FLAG_POLLING 1
322 uint16_t buffer_size;
323 } memif_queue_details_t;
325 /** \brief Memif region details
326 @param index - region index
327 @param addr - region address
328 @param size - region size
329 @param fd - file descriptor
330 @param is_external - if not zero then region is defined by client
339 } memif_region_details_t;
341 /** \brief Memif details
342 @param if_name - interface name
343 @param inst_name - application name
344 @param remote_if_name - peer interface name
345 @param remote_inst_name - peer application name
346 @param id - connection id
347 @param secret - secret
348 @param role - 0 = master, 1 = slave
349 @param mode - 0 = ethernet, 1 = ip , 2 = punt/inject
350 @param socket_filename - socket filename
351 @param regions_num - number of regions
352 @param regions - struct containing region details
353 @param rx_queues_num - number of receive queues
354 @param tx_queues_num - number of transmit queues
355 @param rx_queues - struct containing receive queue details
356 @param tx_queues - struct containing transmit queue details
357 @param link_up_down - 1 = up (connected), 2 = down (disconnected)
363 uint8_t *remote_if_name;
364 uint8_t *remote_inst_name;
367 uint8_t *secret; /* optional */
368 uint8_t role; /* 0 = master, 1 = slave */
369 uint8_t mode; /* 0 = ethernet, 1 = ip, 2 = punt/inject */
370 uint8_t *socket_filename;
372 memif_region_details_t *regions;
373 uint8_t rx_queues_num;
374 uint8_t tx_queues_num;
375 memif_queue_details_t *rx_queues;
376 memif_queue_details_t *tx_queues;
378 uint8_t link_up_down; /* 1 = up, 0 = down */
383 * @defgroup API_CALLS Api calls
389 /** \brief Memif get version
391 \return ((MEMIF_VERSION_MAJOR << 8) | MEMIF_VERSION_MINOR)
393 uint16_t memif_get_version ();
395 /** \biref Memif get queue event file descriptor
396 @param conn - memif connection handle
397 @param qid - queue id
398 @param[out] fd - returns event file descriptor
403 int memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *fd);
405 /** \brief Memif set rx mode
406 @param conn - memif connection handle
407 @param rx_mode - receive mode
408 @param qid - queue id
412 int memif_set_rx_mode (memif_conn_handle_t conn, memif_rx_mode_t rx_mode,
415 /** \brief Memif strerror
416 @param err_code - error code
418 Converts error code to error message.
422 char *memif_strerror (int err_code);
424 /** \brief Memif get details
425 @param conn - memif conenction handle
426 @param md - pointer to memif details struct
427 @param buf - buffer containing details strings
428 @param buflen - length of buffer
432 int memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
433 char *buf, ssize_t buflen);
435 /** \brief Memif initialization
436 @param on_control_fd_update - if control fd updates inform user to watch new fd
437 @param app_name - application name (will be truncated to 32 chars)
438 @param memif_alloc - cutom memory allocator, NULL = default
439 @param memif_realloc - custom memory reallocation, NULL = default
440 @param memif_free - custom memory free, NULL = default
442 if param on_control_fd_update is set to NULL,
443 libmemif will handle file descriptor event polling
444 if a valid callback is set, file descriptor event polling needs to be done by
445 user application, all file descriptors and event types will be passed in
446 this callback to user application
448 Initialize internal libmemif structures. Create timerfd (used to periodically request connection by
449 disconnected memifs in slave mode, with no additional API call). This fd is passed to user with memif_control_fd_update_t
450 timer is inactive at this state. It activates with if there is at least one memif in slave mode.
454 int memif_init (memif_control_fd_update_t * on_control_fd_update,
455 char *app_name, memif_alloc_t * memif_alloc,
456 memif_realloc_t * memif_realloc, memif_free_t * memif_free);
458 /** \brief Memif cleanup
460 Free libmemif internal allocations.
464 int memif_cleanup ();
466 /** \brief Memory interface create function
467 @param conn - connection handle for user app
468 @param args - memory interface connection arguments
469 @param on_connect - inform user about connected status
470 @param on_disconnect - inform user about disconnected status
471 @param on_interrupt - informs user about interrupt, if set to null user will not be notified about interrupt, user can use memif_get_queue_efd call to get interrupt fd to poll for events
472 @param private_ctx - private contex passed back to user with callback
474 Creates memory interface.
477 Start timer that will send events to timerfd. If this fd is passed to memif_control_fd_handler
478 every disconnected memif in slave mode will send connection request.
479 On success new fd is passed to user with memif_control_fd_update_t.
482 Create listener socket and pass fd to user with memif_cntrol_fd_update_t.
483 If this fd is passed to memif_control_fd_handler accept will be called and
484 new fd will be passed to user with memif_control_fd_update_t.
489 int memif_create (memif_conn_handle_t * conn, memif_conn_args_t * args,
490 memif_connection_update_t * on_connect,
491 memif_connection_update_t * on_disconnect,
492 memif_interrupt_t * on_interrupt, void *private_ctx);
494 /** \brief Memif control file descriptor handler
495 @param fd - file descriptor on which the event occured
496 @param events - event type(s) that occured
498 If event occures on any control fd, call memif_control_fd_handler.
499 Internal - lib will "identify" fd (timerfd, lsitener, control) and handle event accordingly.
503 Every disconnected memif in slave mode will request connection.
504 LISTENER or CONTROL -
505 Handle socket messaging (internal connection establishment).
507 Call on_interrupt callback (if set).
512 int memif_control_fd_handler (int fd, uint8_t events);
514 /** \brief Memif delete
515 @param conn - pointer to memif connection handle
518 disconnect session (free queues and regions, close file descriptors, unmap shared memory)
519 set connection handle to NULL, to avoid possible double free
523 int memif_delete (memif_conn_handle_t * conn);
525 /** \brief Memif buffer enq tx
526 @param conn - memif conenction handle
527 @param qid - number indentifying queue
528 @param bufs - memif buffers
529 @param count - number of memif buffers to enque
530 @param count_out - returns number of allocated buffers
532 Slave is producer of buffers.
533 If connection handle points to master returns MEMIF_ERR_INVAL_ARG.
537 int memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
538 memif_buffer_t * bufs, uint16_t count,
539 uint16_t * count_out);
541 /** \brief Memif buffer alloc
542 @param conn - memif conenction handle
543 @param qid - number indentifying queue
544 @param bufs - memif buffers
545 @param count - number of memif buffers to allocate
546 @param count_out - returns number of allocated buffers
547 @param size - buffer size, may return chained buffers if size > buffer_size
551 int memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
552 memif_buffer_t * bufs, uint16_t count,
553 uint16_t * count_out, uint16_t size);
555 /** \brief Memif refill ring
556 @param conn - memif conenction handle
557 @param qid - number indentifying queue
558 @param count - number of buffers to be placed on ring
559 @param headroom - offset the buffer by headroom
563 int memif_refill_queue (memif_conn_handle_t conn, uint16_t qid,
564 uint16_t count, uint16_t headroom);
566 /** \brief Memif transmit buffer burst
567 @param conn - memif conenction handle
568 @param qid - number indentifying queue
569 @param bufs - memif buffers
570 @param count - number of memif buffers to transmit
571 @param tx - returns number of transmitted buffers
575 int memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
576 memif_buffer_t * bufs, uint16_t count, uint16_t * tx);
578 /** \brief Memif receive buffer burst
579 @param conn - memif conenction handle
580 @param qid - number indentifying queue
581 @param bufs - memif buffers
582 @param count - number of memif buffers to receive
583 @param rx - returns number of received buffers
587 int memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
588 memif_buffer_t * bufs, uint16_t count, uint16_t * rx);
590 /** \brief Memif poll event
591 @param timeout - timeout in seconds
593 Passive event polling -
594 timeout = 0 - dont wait for event, check event queue if there is an event and return.
595 timeout = -1 - wait until event
599 int memif_poll_event (int timeout);
601 /** \brief Send signal to stop concurrently running memif_poll_event().
603 The function, however, does not wait for memif_poll_event() to stop.
604 memif_poll_event() may still return simply because an event has occured
605 or the timeout has elapsed, but if called repeatedly in an infinite loop,
606 a canceled memif_poll_event() is guaranted to return MEMIF_ERR_POLL_CANCEL
607 in the shortest possible time.
608 This feature was not available in the first release.
609 Use macro MEMIF_HAVE_CANCEL_POLL_EVENT to check if the feature is present.
613 #define MEMIF_HAVE_CANCEL_POLL_EVENT 1
614 int memif_cancel_poll_event ();
617 #endif /* _LIBMEMIF_H_ */