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 *------------------------------------------------------------------
21 #include <sys/types.h>
23 #include <sys/ioctl.h>
24 #include <sys/socket.h>
28 #include <sys/prctl.h>
34 #include <linux/icmp.h>
35 #include <arpa/inet.h>
37 #include <netinet/if_ether.h>
38 #include <net/if_arp.h>
39 #include <asm/byteorder.h>
44 #include <sys/eventfd.h>
45 #include <sys/timerfd.h>
46 #include <sys/epoll.h>
48 #include <linux/memfd.h>
50 /* memif protocol msg, ring and descriptor definitions */
54 /* socket messaging functions */
56 /* private structs and functions */
57 #include <memif_private.h>
59 #define ERRLIST_LEN 40
60 #define MAX_ERRBUF_LEN 256
63 #define MEMIF_MEMORY_BARRIER() __builtin_ia32_sfence ()
65 #define MEMIF_MEMORY_BARRIER() __sync_synchronize ()
66 #endif /* __x86_x64__ */
68 static char memif_buf[MAX_ERRBUF_LEN];
70 const char *memif_errlist[ERRLIST_LEN] = { /* MEMIF_ERR_SUCCESS */
72 /* MEMIF_ERR_SYSCALL */
73 "Unspecified syscall error (build with -DMEMIF_DBG or make debug).",
74 /* MEMIF_ERR_CONNREFUSED */
77 "Permission to resource denied.",
78 /* MEMIF_ERR_NO_FILE */
79 "Socket file does not exist",
80 /* MEMIF_ERR_FILE_LIMIT */
81 "System limit on total numer of open files reached.",
82 /* MEMIF_ERR_PROC_FILE_LIMIT */
83 "Per-process limit on total number of open files reached.",
84 /* MEMIF_ERR_ALREADY */
85 "Connection already requested.",
87 "File descriptor refers to file other than socket, or operation would block.",
88 /* MEMIF_ERR_BAD_FD */
89 "Bad file descriptor.",
92 /* MEMIF_ERR_INVAL_ARG */
94 /* MEMIF_ERR_NOCONN */
95 "Memif connection handle does not point to existing connection",
97 "Memif connection handle points to existing connection",
98 /* MEMIF_ERR_CB_FDUPDATE */
99 "Callback memif_control_fd_update_t returned error",
100 /* MEMIF_ERR_FILE_NOT_SOCK */
101 "File specified by socket filename exists and is not socket.",
102 /* MEMIF_ERR_NO_SHMFD */
103 "Missing shared memory file descriptor. (internal error)",
104 /* MEMIF_ERR_COOKIE */
105 "Invalid cookie on ring. (internal error)",
106 /* MEMIF_ERR_NOBUF_RING */
108 /* MEMIF_ERR_NOBUF */
109 "Not enough memif buffers. There are unreceived data in shared memory.",
110 /* MEMIF_ERR_NOBUF_DET */
111 "Not enough space for memif details in supplied buffer. String data might be malformed.",
112 /* MEMIF_ERR_INT_WRITE */
113 "Send interrupt error.",
114 /* MEMIF_ERR_MFMSG */
115 "Malformed message received on control channel.",
118 /* MEMIF_ERR_PROTO */
119 "Incompatible memory interface protocol version.",
121 "Unmatched interface id.",
122 /* MEMIF_ERR_ACCSLAVE */
123 "Slave cannot accept connection request.",
124 /* MEMIF_ERR_ALRCONN */
125 "Interface is already connected.",
128 /* MEMIF_ERR_SECRET */
130 /* MEMIF_ERR_NOSECRET */
132 /* MEMIF_ERR_MAXREG */
133 "Limit on total number of regions reached.",
134 /* MEMIF_ERR_MAXRING */
135 "Limit on total number of ring reached.",
136 /* MEMIF_ERR_NO_INTFD */
137 "Missing interrupt file descriptor. (internal error)",
138 /* MEMIF_ERR_DISCONNECT */
139 "Interface received disconnect request.",
140 /* MEMIF_ERR_DISCONNECTED */
141 "Interface is disconnected.",
142 /* MEMIF_ERR_UNKNOWN_MSG */
143 "Unknown message type received on control channel. (internal error)",
144 /* MEMIF_ERR_POLL_CANCEL */
145 "Memif event polling was canceled.",
146 /* MEMIF_ERR_MAX_RING */
147 "Maximum log2 ring size is 15",
148 /* MEMIF_ERR_PRIVHDR */
149 "Private headers not supported."
152 #define MEMIF_ERR_UNDEFINED "undefined error"
155 memif_strerror (int err_code)
157 if (err_code >= ERRLIST_LEN)
159 strlcpy (memif_buf, MEMIF_ERR_UNDEFINED, sizeof (memif_buf));
163 strlcpy (memif_buf, memif_errlist[err_code], sizeof (memif_buf));
164 memif_buf[strlen (memif_errlist[err_code])] = '\0';
172 return MEMIF_VERSION;
176 memif_get_version_str ()
178 #define __STR_HELPER(x) #x
179 #define __STR(x) __STR_HELPER (x)
180 return __STR (MEMIF_VERSION_MAJOR) "." __STR (MEMIF_VERSION_MINOR);
185 #define DBG_TX_BUF (0)
186 #define DBG_RX_BUF (1)
190 print_bytes (void *data, uint16_t len, uint8_t q)
193 printf ("\nTX:\n\t");
195 printf ("\nRX:\n\t");
197 for (i = 0; i < len; i++)
200 printf ("\n%d:\t", i);
201 printf ("%02X ", ((uint8_t *) (data))[i]);
205 #endif /* MEMIF_DBG_SHM */
208 memif_syscall_error_handler (int err_code)
210 DBG ("%s", strerror (err_code));
213 return MEMIF_ERR_SUCCESS;
214 if (err_code == EACCES)
215 return MEMIF_ERR_ACCES;
216 if (err_code == ENFILE)
217 return MEMIF_ERR_FILE_LIMIT;
218 if (err_code == EMFILE)
219 return MEMIF_ERR_PROC_FILE_LIMIT;
220 if (err_code == ENOMEM)
221 return MEMIF_ERR_NOMEM;
222 /* connection refused if master does not exist
223 this error would spam the user until master was created */
225 if (err_code == ECONNREFUSED)
226 return MEMIF_ERR_SUCCESS;
228 if (err_code == ECONNREFUSED)
229 return MEMIF_ERR_CONNREFUSED;
230 if (err_code == EALREADY)
231 return MEMIF_ERR_ALREADY;
232 if (err_code == EAGAIN)
233 return MEMIF_ERR_AGAIN;
234 if (err_code == EBADF)
235 return MEMIF_ERR_BAD_FD;
236 if (err_code == ENOENT)
237 return MEMIF_ERR_NO_FILE;
239 /* other syscall errors */
240 return MEMIF_ERR_SYSCALL;
244 memif_add_epoll_fd (memif_socket_t *ms, memif_fd_event_t fde, uint32_t events)
248 DBG ("invalid fd %d", fde.fd);
251 struct epoll_event evt;
252 memset (&evt, 0, sizeof (evt));
254 evt.data.ptr = fde.private_ctx;
255 if (epoll_ctl (ms->epfd, EPOLL_CTL_ADD, fde.fd, &evt) < 0)
257 DBG ("epoll_ctl: %s fd %d", strerror (errno), fde.fd);
260 DBG ("fd %d added to epoll", fde.fd);
265 memif_mod_epoll_fd (memif_socket_t *ms, memif_fd_event_t fde, uint32_t events)
269 DBG ("invalid fd %d", fde.fd);
272 struct epoll_event evt;
273 memset (&evt, 0, sizeof (evt));
275 evt.data.ptr = fde.private_ctx;
276 if (epoll_ctl (ms->epfd, EPOLL_CTL_MOD, fde.fd, &evt) < 0)
278 DBG ("epoll_ctl: %s fd %d", strerror (errno), fde.fd);
281 DBG ("fd %d modified on epoll", fde.fd);
286 memif_del_epoll_fd (memif_socket_t *ms, memif_fd_event_t fde)
290 DBG ("invalid fd %d", fde.fd);
293 struct epoll_event evt;
294 memset (&evt, 0, sizeof (evt));
295 if (epoll_ctl (ms->epfd, EPOLL_CTL_DEL, fde.fd, &evt) < 0)
297 DBG ("epoll_ctl: %s fd %d", strerror (errno), fde.fd);
300 DBG ("fd %d removed from epoll", fde.fd);
305 memif_control_fd_update (memif_fd_event_t fde, void *private_ctx)
307 memif_socket_t *ms = (memif_socket_t *) private_ctx;
311 return MEMIF_ERR_INVAL_ARG;
313 if (fde.type & MEMIF_FD_EVENT_DEL)
314 return memif_del_epoll_fd (ms, fde);
317 if (fde.type & MEMIF_FD_EVENT_READ)
319 if (fde.type & MEMIF_FD_EVENT_WRITE)
322 if (fde.type & MEMIF_FD_EVENT_MOD)
323 return memif_mod_epoll_fd (ms, fde, evt);
325 return memif_add_epoll_fd (ms, fde, evt);
329 memif_control_fd_update_register (memif_socket_t *ms,
330 memif_control_fd_update_t *cb)
332 ms->args.on_control_fd_update = cb;
336 memif_register_external_region (memif_socket_handle_t sock,
337 memif_add_external_region_t *ar,
338 memif_get_external_region_addr_t *gr,
339 memif_del_external_region_t *dr,
340 memif_get_external_buffer_offset_t *go)
342 memif_socket_t *ms = (memif_socket_t *) sock;
343 ms->add_external_region = ar;
344 ms->get_external_region_addr = gr;
345 ms->del_external_region = dr;
346 ms->get_external_buffer_offset = go;
350 memif_alloc_register (memif_socket_t *ms, memif_alloc_t *ma)
356 memif_realloc_register (memif_socket_t *ms, memif_realloc_t *mr)
358 ms->args.realloc = mr;
362 memif_free_register (memif_socket_t *ms, memif_free_t *mf)
367 static inline memif_ring_t *
368 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
371 if (&conn->regions[0] == NULL)
373 void *p = conn->regions[0].addr;
375 sizeof (memif_ring_t) +
376 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
377 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
379 return (memif_ring_t *) p;
383 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
386 memif_connection_t *conn = (memif_connection_t *) c;
388 return MEMIF_ERR_NOCONN;
390 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->
391 run_args.num_m2s_rings;
393 return MEMIF_ERR_QID;
395 conn->rx_queues[qid].ring->flags = rx_mode;
396 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
397 return MEMIF_ERR_SUCCESS;
401 memif_poll_cancel_handler (memif_fd_event_type_t type, void *private_ctx)
403 return MEMIF_ERR_POLL_CANCEL;
407 memif_connect_handler (memif_fd_event_type_t type, void *private_ctx)
409 memif_socket_t *ms = (memif_socket_t *) private_ctx;
410 memif_connection_t *c;
412 /* loop ms->slave_interfaces and request connection for disconnected ones */
413 TAILQ_FOREACH (c, &ms->slave_interfaces, next)
415 /* connected or connecting */
416 if (c->control_channel != NULL)
420 memif_request_connection (c);
423 return MEMIF_ERR_SUCCESS;
427 memif_set_connection_request_timer (memif_socket_handle_t sock,
428 struct itimerspec timer)
430 memif_socket_t *ms = (memif_socket_t *) sock;
431 memif_fd_event_t fde;
432 memif_fd_event_data_t *fdata;
436 return MEMIF_ERR_INVAL_ARG;
438 if (ms->timer_fd < 0)
440 /* only create new timer if there is a valid interval */
441 if (timer.it_interval.tv_sec == 0 && timer.it_interval.tv_nsec == 0)
442 return MEMIF_ERR_SUCCESS;
445 ms->timer_fd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
446 if (ms->timer_fd < 0)
447 return memif_syscall_error_handler (errno);
449 /* start listening for events */
450 fdata = ms->args.alloc (sizeof (*fdata));
451 fdata->event_handler = memif_connect_handler;
452 fdata->private_ctx = ms;
454 fde.fd = ms->timer_fd;
455 fde.type = MEMIF_FD_EVENT_READ;
456 fde.private_ctx = fdata;
458 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
459 ms->args.on_control_fd_update (fde, ctx);
462 ms->args.connection_request_timer = timer;
465 if (timerfd_settime (ms->timer_fd, 0, &ms->args.connection_request_timer,
467 return memif_syscall_error_handler (errno);
469 return MEMIF_ERR_SUCCESS;
473 memif_create_socket (memif_socket_handle_t *sock, memif_socket_args_t *args,
476 memif_socket_t *ms = (memif_socket_t *) * sock;
477 memif_fd_event_t fde;
478 memif_fd_event_data_t *fdata;
479 int i, err = MEMIF_ERR_SUCCESS;
482 /* allocate memif_socket_t */
484 if (args->alloc != NULL)
485 ms = args->alloc (sizeof (memif_socket_t));
487 ms = malloc (sizeof (memif_socket_t));
490 err = MEMIF_ERR_NOMEM;
495 memset (ms, 0, sizeof (memif_socket_t));
497 ms->listener_fd = -1;
498 ms->poll_cancel_fd = -1;
501 /* copy arguments to internal struct */
502 memcpy (&ms->args, args, sizeof (*args));
503 ms->private_ctx = private_ctx;
505 if (ms->args.alloc == NULL)
506 memif_alloc_register (ms, malloc);
507 if (ms->args.realloc == NULL)
508 memif_realloc_register (ms, realloc);
509 if (ms->args.free == NULL)
510 memif_free_register (ms, free);
512 TAILQ_INIT (&ms->master_interfaces);
513 TAILQ_INIT (&ms->slave_interfaces);
515 /* FIXME: implement connection request timer */
517 /* initialize internal epoll */
518 if (ms->args.on_control_fd_update == NULL)
520 ms->epfd = epoll_create (1);
521 /* register default fd update callback */
522 memif_control_fd_update_register (ms, memif_control_fd_update);
523 ms->poll_cancel_fd = eventfd (0, EFD_NONBLOCK);
524 if (ms->poll_cancel_fd < 0)
527 DBG ("eventfd: %s", strerror (err));
528 return memif_syscall_error_handler (err);
530 /* add interrupt fd to epfd */
531 fdata = ms->args.alloc (sizeof (*fdata));
532 fdata->event_handler = memif_poll_cancel_handler;
533 fdata->private_ctx = ms;
535 fde.fd = ms->poll_cancel_fd;
536 fde.type = MEMIF_FD_EVENT_READ;
537 fde.private_ctx = fdata;
539 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
540 ms->args.on_control_fd_update (fde, ctx);
544 memif_set_connection_request_timer (ms, ms->args.connection_request_timer);
545 if (err != MEMIF_ERR_SUCCESS)
558 if (ms->poll_cancel_fd != -1)
559 close (ms->poll_cancel_fd);
564 memif_socket_handle_t
565 memif_get_socket_handle (memif_conn_handle_t conn)
567 memif_connection_t *c = (memif_connection_t *) conn;
572 return c->args.socket;
576 memif_get_socket_path (memif_socket_handle_t sock)
578 memif_socket_t *ms = (memif_socket_t *) sock;
583 return ms->args.path;
587 memif_get_listener_fd (memif_socket_handle_t sock)
589 memif_socket_t *ms = (memif_socket_t *) sock;
594 return ms->listener_fd;
598 memif_set_listener_fd (memif_socket_handle_t sock, int fd)
600 memif_socket_t *ms = (memif_socket_t *) sock;
601 memif_fd_event_t fde;
602 memif_fd_event_data_t *fdata;
605 if ((ms == NULL) || (fd < 0))
606 return MEMIF_ERR_INVAL_ARG;
608 fdata = ms->args.alloc (sizeof (*fdata));
610 return MEMIF_ERR_NOMEM;
612 ms->listener_fd = fd;
614 fdata->event_handler = memif_listener_handler;
615 fdata->private_ctx = ms;
616 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
617 /* send fd to epoll */
618 fde.fd = ms->listener_fd;
619 fde.type = MEMIF_FD_EVENT_READ;
620 fde.private_ctx = fdata;
621 ms->args.on_control_fd_update (fde, ctx);
623 return MEMIF_ERR_SUCCESS;
627 memif_create (memif_conn_handle_t *c, memif_conn_args_t *args,
628 memif_connection_update_t *on_connect,
629 memif_connection_update_t *on_disconnect,
630 memif_on_interrupt_t *on_interrupt, void *private_ctx)
633 memif_connection_t *conn = (memif_connection_t *) * c;
634 memif_socket_t *ms = (memif_socket_t *) args->socket;
638 DBG ("This handle already points to existing memif.");
639 return MEMIF_ERR_CONN;
644 DBG ("Missing memif socket");
645 return MEMIF_ERR_INVAL_ARG;
648 conn = (memif_connection_t *) ms->args.alloc (sizeof (*conn));
651 err = MEMIF_ERR_NOMEM;
654 memset (conn, 0, sizeof (memif_connection_t));
656 conn->args.interface_id = args->interface_id;
658 if (args->log2_ring_size == 0)
659 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
660 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
662 err = MEMIF_ERR_MAX_RING;
665 if (args->buffer_size == 0)
666 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
667 if (args->num_s2m_rings == 0)
668 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
669 if (args->num_m2s_rings == 0)
670 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
672 conn->args.num_s2m_rings = args->num_s2m_rings;
673 conn->args.num_m2s_rings = args->num_m2s_rings;
674 conn->args.buffer_size = args->buffer_size;
675 conn->args.log2_ring_size = args->log2_ring_size;
676 conn->args.is_master = args->is_master;
677 conn->args.mode = args->mode;
678 conn->args.socket = args->socket;
679 conn->regions = NULL;
680 conn->tx_queues = NULL;
681 conn->rx_queues = NULL;
682 conn->control_channel = NULL;
683 conn->on_connect = on_connect;
684 conn->on_disconnect = on_disconnect;
685 conn->on_interrupt = on_interrupt;
686 conn->private_ctx = private_ctx;
687 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
689 uint8_t l = sizeof (conn->args.interface_name);
690 strlcpy ((char *) conn->args.interface_name, (char *) args->interface_name,
693 if ((l = strlen ((char *) args->secret)) > 0)
694 strlcpy ((char *) conn->args.secret, (char *) args->secret,
695 sizeof (conn->args.secret));
698 TAILQ_INSERT_TAIL (&ms->master_interfaces, conn, next);
700 TAILQ_INSERT_TAIL (&ms->slave_interfaces, conn, next);
702 err = memif_request_connection (conn);
703 if (err != MEMIF_ERR_SUCCESS && err != MEMIF_ERR_CONNREFUSED)
706 TAILQ_REMOVE (&ms->master_interfaces, conn, next);
708 TAILQ_REMOVE (&ms->slave_interfaces, conn, next);
718 ms->args.free (conn);
724 memif_path_is_abstract (const char *filename)
726 return (filename[0] == '@');
730 memif_request_connection (memif_conn_handle_t c)
732 memif_connection_t *conn = (memif_connection_t *) c;
734 int err = MEMIF_ERR_SUCCESS;
736 struct sockaddr_un un = { 0 };
737 struct stat file_stat;
739 memif_control_channel_t *cc = NULL;
740 memif_fd_event_t fde;
741 memif_fd_event_data_t *fdata = NULL;
742 int sunlen = sizeof (un);
746 return MEMIF_ERR_NOCONN;
748 ms = (memif_socket_t *) conn->args.socket;
750 /* if control channel is assigned, the interface is either connected or
752 if (conn->control_channel != NULL)
753 return MEMIF_ERR_ALRCONN;
754 /* if interface is master and the socket is already listener we are done */
755 if (conn->args.is_master && (ms->listener_fd != -1))
756 return MEMIF_ERR_SUCCESS;
758 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
761 err = memif_syscall_error_handler (errno);
765 un.sun_family = AF_UNIX;
767 /* use memcpy to support abstract socket
768 * ms->args.path is already a valid socket path
770 memcpy (un.sun_path, ms->args.path, sizeof (un.sun_path) - 1);
772 /* allocate fd event data */
773 fdata = ms->args.alloc (sizeof (*fdata));
776 err = MEMIF_ERR_NOMEM;
780 if (memif_path_is_abstract (ms->args.path))
782 /* Ensure the string is NULL terminated */
783 un.sun_path[sizeof (un.sun_path) - 1] = '\0';
784 /* sunlen is strlen(un.sun_path) + sizeof(un.sun_family) */
785 sunlen = strlen (un.sun_path) + (sizeof (un) - sizeof (un.sun_path));
786 /* Handle abstract socket by converting '@' -> '\0' */
787 un.sun_path[0] = '\0';
790 if (conn->args.is_master != 0)
792 /* Configure socket optins */
793 if (setsockopt (sockfd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
795 err = memif_syscall_error_handler (errno);
798 if (bind (sockfd, (struct sockaddr *) &un, sunlen) < 0)
800 err = memif_syscall_error_handler (errno);
803 if (listen (sockfd, 1) < 0)
805 err = memif_syscall_error_handler (errno);
808 if (!memif_path_is_abstract (ms->args.path))
810 /* Verify that the socket was created */
811 if (stat ((char *) ms->args.path, &file_stat) < 0)
813 err = memif_syscall_error_handler (errno);
818 /* assign listener fd */
819 ms->listener_fd = sockfd;
821 fdata->event_handler = memif_listener_handler;
822 fdata->private_ctx = ms;
826 cc = ms->args.alloc (sizeof (*cc));
829 err = MEMIF_ERR_NOMEM;
832 if (connect (sockfd, (struct sockaddr *) &un, sunlen) != 0)
834 err = MEMIF_ERR_CONNREFUSED;
838 /* Create control channel */
842 TAILQ_INIT (&cc->msg_queue);
844 /* assign control channel to endpoint */
845 conn->control_channel = cc;
847 fdata->event_handler = memif_control_channel_handler;
848 fdata->private_ctx = cc;
851 /* if event polling is done internally, send memif socket as context */
852 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
853 /* send fd to epoll */
855 fde.type = MEMIF_FD_EVENT_READ;
856 fde.private_ctx = fdata;
857 ms->args.on_control_fd_update (fde, ctx);
866 ms->args.free (fdata);
870 conn->control_channel = cc = NULL;
875 memif_control_fd_handler (void *ptr, memif_fd_event_type_t events)
877 memif_fd_event_data_t *fdata = (memif_fd_event_data_t *) ptr;
880 return MEMIF_ERR_INVAL_ARG;
882 return fdata->event_handler (events, fdata->private_ctx);
886 memif_interrupt_handler (memif_fd_event_type_t type, void *private_ctx)
888 memif_interrupt_t *idata = (memif_interrupt_t *) private_ctx;
891 return MEMIF_ERR_INVAL_ARG;
893 return idata->c->on_interrupt (idata->c, idata->c->private_ctx, idata->qid);
897 memif_poll_event (memif_socket_handle_t sock, int timeout)
899 memif_socket_t *ms = (memif_socket_t *) sock;
900 struct epoll_event evt;
901 int en = 0, err = MEMIF_ERR_SUCCESS; /* 0 */
902 memif_fd_event_type_t events = 0;
903 uint64_t counter = 0;
908 return MEMIF_ERR_INVAL_ARG;
910 memset (&evt, 0, sizeof (evt));
911 evt.events = EPOLLIN | EPOLLOUT;
912 sigemptyset (&sigset);
913 en = epoll_pwait (ms->epfd, &evt, 1, timeout, &sigset);
917 DBG ("epoll_pwait: %s", strerror (err));
918 return memif_syscall_error_handler (err);
922 if (evt.events & EPOLLIN)
923 events |= MEMIF_FD_EVENT_READ;
924 if (evt.events & EPOLLOUT)
925 events |= MEMIF_FD_EVENT_WRITE;
926 if (evt.events & EPOLLERR)
927 events |= MEMIF_FD_EVENT_ERROR;
928 return memif_control_fd_handler (evt.data.ptr, events);
930 return MEMIF_ERR_SUCCESS;
934 memif_cancel_poll_event (memif_socket_handle_t sock)
936 memif_socket_t *ms = (memif_socket_t *) sock;
937 uint64_t counter = 1;
940 if (ms->poll_cancel_fd == -1)
941 return MEMIF_ERR_INVAL_ARG;
942 w = write (ms->poll_cancel_fd, &counter, sizeof (counter));
943 if (w < sizeof (counter))
944 return MEMIF_ERR_INT_WRITE;
946 return MEMIF_ERR_SUCCESS;
950 memif_close_queues (memif_socket_t *ms, memif_queue_t *queues, int nqueues)
952 memif_fd_event_t fde;
957 for (i = 0; i < nqueues; i++)
964 /* Stop listening for events */
966 fde.type = MEMIF_FD_EVENT_DEL;
967 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
968 ms->args.on_control_fd_update (fde, ctx);
976 /* send disconnect msg and close interface */
978 memif_disconnect_internal (memif_connection_t * c)
980 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
982 memif_socket_t *ms = (memif_socket_t *) c->args.socket;
983 memif_fd_event_t fde;
986 c->on_disconnect ((void *) c, c->private_ctx);
988 /* Delete control channel */
989 if (c->control_channel != NULL)
990 memif_delete_control_channel (c->control_channel);
992 if (c->tx_queues != NULL)
994 memif_close_queues (ms, c->tx_queues, c->tx_queues_num);
995 ms->args.free (c->tx_queues);
998 c->tx_queues_num = 0;
1000 if (c->rx_queues != NULL)
1002 memif_close_queues (ms, c->rx_queues, c->rx_queues_num);
1003 ms->args.free (c->rx_queues);
1004 c->rx_queues = NULL;
1006 c->rx_queues_num = 0;
1008 /* TODO: Slave reuse regions */
1010 for (i = 0; i < c->regions_num; i++)
1012 if (&c->regions[i] == NULL)
1014 if (c->regions[i].is_external != 0)
1016 ms->del_external_region (c->regions[i].addr,
1017 c->regions[i].region_size, c->regions[i].fd,
1022 if (munmap (c->regions[i].addr, c->regions[i].region_size) < 0)
1023 return memif_syscall_error_handler (errno);
1024 if (c->regions[i].fd > 0)
1025 close (c->regions[i].fd);
1026 c->regions[i].fd = -1;
1029 ms->args.free (c->regions);
1033 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1039 memif_get_socket_filename (memif_socket_handle_t sock)
1041 memif_socket_t *ms = (memif_socket_t *) sock;
1046 return (char *) ms->args.path;
1050 memif_delete_socket (memif_socket_handle_t * sock)
1052 memif_socket_t *ms = (memif_socket_t *) * sock;
1053 memif_fd_event_t fde;
1056 /* check if socket is in use */
1057 if (ms == NULL || !TAILQ_EMPTY (&ms->master_interfaces) ||
1058 !TAILQ_EMPTY (&ms->slave_interfaces))
1059 return MEMIF_ERR_INVAL_ARG;
1061 if (ms->listener_fd > 0)
1063 fde.fd = ms->listener_fd;
1064 fde.type = MEMIF_FD_EVENT_DEL;
1065 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
1066 ms->args.on_control_fd_update (fde, ctx);
1068 ms->listener_fd = -1;
1070 if (ms->poll_cancel_fd > 0)
1072 fde.fd = ms->poll_cancel_fd;
1073 fde.type = MEMIF_FD_EVENT_DEL;
1074 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
1075 ms->args.on_control_fd_update (fde, ctx);
1077 ms->poll_cancel_fd = -1;
1086 return MEMIF_ERR_SUCCESS;
1090 memif_delete (memif_conn_handle_t * conn)
1092 memif_connection_t *c = (memif_connection_t *) * conn;
1094 int err = MEMIF_ERR_SUCCESS;
1098 DBG ("no connection");
1099 return MEMIF_ERR_NOCONN;
1102 err = memif_disconnect_internal (c);
1104 ms = (memif_socket_t *) c->args.socket;
1106 if (c->args.is_master)
1107 TAILQ_REMOVE (&ms->master_interfaces, c, next);
1109 TAILQ_REMOVE (&ms->slave_interfaces, c, next);
1110 /* TODO: don't listen with empty interface queue */
1120 memif_connect1 (memif_connection_t * c)
1128 return MEMIF_ERR_INVAL_ARG;
1130 ms = (memif_socket_t *) c->args.socket;
1132 for (i = 0; i < c->regions_num; i++)
1134 mr = &c->regions[i];
1139 if (mr->is_external)
1141 if (ms->get_external_region_addr == NULL)
1142 return MEMIF_ERR_INVAL_ARG;
1143 mr->addr = ms->get_external_region_addr (
1144 mr->region_size, mr->fd, c->private_ctx);
1149 return MEMIF_ERR_NO_SHMFD;
1152 mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1153 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1155 return memif_syscall_error_handler (errno);
1162 for (i = 0; i < c->rx_queues_num; i++)
1164 mq = &c->rx_queues[i];
1167 mq->ring = c->regions[mq->region].addr + mq->offset;
1168 if (mq->ring->cookie != MEMIF_COOKIE)
1170 DBG ("wrong cookie on rx ring %u", i);
1171 return MEMIF_ERR_COOKIE;
1173 mq->ring->head = mq->ring->tail = mq->last_head = mq->next_buf = 0;
1177 for (i = 0; i < c->tx_queues_num; i++)
1179 mq = &c->tx_queues[i];
1182 mq->ring = c->regions[mq->region].addr + mq->offset;
1183 if (mq->ring->cookie != MEMIF_COOKIE)
1185 DBG ("wrong cookie on tx ring %u", i);
1186 return MEMIF_ERR_COOKIE;
1188 mq->ring->head = mq->ring->tail = mq->last_head = mq->next_buf = 0;
1196 memif_add_region (memif_connection_t *conn, uint8_t has_buffers)
1199 memif_socket_t *ms = (memif_socket_t *) conn->args.socket;
1201 r = ms->args.realloc (conn->regions,
1202 sizeof (memif_region_t) * ++conn->regions_num);
1204 return MEMIF_ERR_NOMEM;
1207 r = &conn->regions[conn->regions_num - 1];
1208 memset (r, 0, sizeof (memif_region_t));
1210 if (has_buffers != 0)
1212 r->buffer_offset = 0;
1217 (conn->run_args.num_s2m_rings +
1218 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1219 sizeof (memif_desc_t) *
1221 run_args.log2_ring_size));
1224 r->region_size = (has_buffers == 0) ? r->buffer_offset : r->buffer_offset +
1225 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1226 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1228 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1229 return memif_syscall_error_handler (errno);
1231 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1232 return memif_syscall_error_handler (errno);
1234 if ((ftruncate (r->fd, r->region_size)) == -1)
1235 return memif_syscall_error_handler (errno);
1237 if ((r->addr = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1238 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1239 return memif_syscall_error_handler (errno);
1241 return MEMIF_ERR_SUCCESS;
1245 memif_init_queues (memif_connection_t *conn)
1249 memif_socket_t *ms = (memif_socket_t *) conn->args.socket;
1251 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1253 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1254 DBG ("RING: %p I: %d", ring, i);
1255 ring->head = ring->tail = 0;
1256 ring->cookie = MEMIF_COOKIE;
1258 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1260 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1261 ring->desc[j].region = 1;
1262 ring->desc[j].offset =
1263 conn->regions[1].buffer_offset +
1264 (uint32_t) (slot * conn->run_args.buffer_size);
1265 ring->desc[j].length = conn->run_args.buffer_size;
1268 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1270 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1271 DBG ("RING: %p I: %d", ring, i);
1272 ring->head = ring->tail = 0;
1273 ring->cookie = MEMIF_COOKIE;
1275 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1277 uint16_t slot = (i + conn->run_args.num_s2m_rings) *
1278 (1 << conn->run_args.log2_ring_size) + j;
1279 ring->desc[j].region = 1;
1280 ring->desc[j].offset =
1281 conn->regions[1].buffer_offset +
1282 (uint32_t) (slot * conn->run_args.buffer_size);
1283 ring->desc[j].length = conn->run_args.buffer_size;
1287 mq = (memif_queue_t *) ms->args.alloc (sizeof (memif_queue_t) *
1288 conn->run_args.num_s2m_rings);
1290 return MEMIF_ERR_NOMEM;
1294 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1296 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1297 return memif_syscall_error_handler (errno);
1299 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1300 DBG ("RING: %p I: %d", mq[x].ring, x);
1301 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1304 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1305 mq[x].last_head = mq[x].last_tail = 0;
1308 conn->tx_queues = mq;
1309 conn->tx_queues_num = conn->run_args.num_s2m_rings;
1311 mq = (memif_queue_t *) ms->args.alloc (sizeof (memif_queue_t) *
1312 conn->run_args.num_m2s_rings);
1314 return MEMIF_ERR_NOMEM;
1316 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1318 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1319 return memif_syscall_error_handler (errno);
1321 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1322 DBG ("RING: %p I: %d", mq[x].ring, x);
1323 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1326 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1327 mq[x].last_head = mq[x].last_tail = 0;
1330 conn->rx_queues = mq;
1331 conn->rx_queues_num = conn->run_args.num_m2s_rings;
1333 return MEMIF_ERR_SUCCESS;
1337 memif_init_regions_and_queues (memif_connection_t * conn)
1340 memif_socket_t *ms = (memif_socket_t *) conn->args.socket;
1342 /* region 0. rings */
1343 memif_add_region (conn, /* has_buffers */ 0);
1345 /* region 1. buffers */
1346 if (ms->add_external_region)
1348 r = (memif_region_t *) ms->args.realloc (
1349 conn->regions, sizeof (memif_region_t) * ++conn->regions_num);
1351 return MEMIF_ERR_NOMEM;
1354 conn->regions[1].region_size =
1355 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1356 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1357 conn->regions[1].buffer_offset = 0;
1358 ms->add_external_region (&conn->regions[1].addr,
1359 conn->regions[1].region_size,
1360 &conn->regions[1].fd, conn->private_ctx);
1361 conn->regions[1].is_external = 1;
1365 memif_add_region (conn, 1);
1368 memif_init_queues (conn);
1374 memif_set_next_free_buffer (memif_conn_handle_t conn, uint16_t qid,
1375 memif_buffer_t *buf)
1377 memif_connection_t *c = (memif_connection_t *) conn;
1378 if (EXPECT_FALSE (c == NULL))
1379 return MEMIF_ERR_NOCONN;
1380 if (EXPECT_FALSE (qid >= c->tx_queues_num))
1381 return MEMIF_ERR_QID;
1382 if (EXPECT_FALSE (buf == NULL))
1383 return MEMIF_ERR_INVAL_ARG;
1385 uint16_t ring_size, ns;
1386 memif_queue_t *mq = &c->tx_queues[qid];
1387 memif_ring_t *ring = mq->ring;
1389 ring_size = (1 << mq->log2_ring_size);
1390 if (c->args.is_master)
1391 ns = ring->head - mq->next_buf;
1393 ns = ring_size - mq->next_buf + ring->tail;
1395 if ((mq->next_buf - buf->desc_index) > ns)
1396 return MEMIF_ERR_INVAL_ARG;
1398 mq->next_buf = buf->desc_index;
1400 return MEMIF_ERR_SUCCESS;
1404 memif_buffer_enq_at_idx_internal (memif_queue_t *from_q, memif_queue_t *to_q,
1405 memif_buffer_t *buf, uint16_t slot)
1407 uint16_t from_mask = (1 << from_q->log2_ring_size) - 1;
1408 uint16_t to_mask = (1 << to_q->log2_ring_size) - 1;
1409 memif_desc_t *from_d, *to_d, tmp_d;
1411 /* Get the descriptors */
1412 from_d = &from_q->ring->desc[buf->desc_index & from_mask];
1413 to_d = &to_q->ring->desc[slot & to_mask];
1415 /* Swap descriptors */
1420 /* Update descriptor index and queue for clients buffer */
1421 buf->desc_index = slot;
1426 memif_buffer_requeue (memif_conn_handle_t conn, memif_buffer_t *buf_a,
1427 memif_buffer_t *buf_b)
1429 memif_connection_t *c = (memif_connection_t *) conn;
1430 if (EXPECT_FALSE (c == NULL))
1431 return MEMIF_ERR_NOCONN;
1432 if (EXPECT_FALSE (c->args.is_master))
1433 return MEMIF_ERR_INVAL_ARG;
1434 if ((buf_a == NULL) || (buf_b == NULL))
1435 return MEMIF_ERR_INVAL_ARG;
1438 /* store buf_a information */
1439 uint16_t index_a = buf_a->desc_index;
1440 memif_queue_t *mq_a = buf_a->queue;
1442 /* swap buffers, buf_a was updated with new desc_index and queue */
1443 memif_buffer_enq_at_idx_internal ((memif_queue_t *) buf_a->queue,
1444 (memif_queue_t *) buf_b->queue, buf_a,
1447 /* update buf_b desc_index and queue */
1448 buf_b->desc_index = index_a;
1449 buf_b->queue = mq_a;
1451 return MEMIF_ERR_SUCCESS;
1455 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1456 memif_buffer_t * bufs, uint16_t count,
1457 uint16_t * count_out)
1459 memif_connection_t *c = (memif_connection_t *) conn;
1460 if (EXPECT_FALSE (c == NULL))
1461 return MEMIF_ERR_NOCONN;
1462 if (EXPECT_FALSE (c->control_channel == NULL))
1463 return MEMIF_ERR_DISCONNECTED;
1464 if (EXPECT_FALSE (qid >= c->tx_queues_num))
1465 return MEMIF_ERR_QID;
1466 if (EXPECT_FALSE (!count_out))
1467 return MEMIF_ERR_INVAL_ARG;
1468 if (EXPECT_FALSE (c->args.is_master))
1469 return MEMIF_ERR_INVAL_ARG;
1471 memif_queue_t *mq = &c->tx_queues[qid];
1472 memif_ring_t *ring = mq->ring;
1474 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1478 int err = MEMIF_ERR_SUCCESS; /* 0 */
1481 ring_size = (1 << mq->log2_ring_size);
1483 /* can only be called by slave */
1484 ns = ring_size - mq->next_buf + ring->tail;
1490 /* Swaps the descriptors, updates next_buf pointer and updates client
1493 memif_buffer_enq_at_idx_internal ((memif_queue_t *) b0->queue, mq, b0,
1496 mq->next_buf++; /* mark the buffer as allocated */
1503 DBG ("allocated: %u/%u bufs. Next buffer pointer %d", *count_out, count,
1508 DBG ("ring buffer full! qid: %u", qid);
1509 err = MEMIF_ERR_NOBUF_RING;
1516 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1517 memif_buffer_t * bufs, uint16_t count,
1518 uint16_t * count_out, uint16_t size)
1520 memif_connection_t *c = (memif_connection_t *) conn;
1521 if (EXPECT_FALSE (c == NULL))
1522 return MEMIF_ERR_NOCONN;
1523 if (EXPECT_FALSE (c->control_channel == NULL))
1524 return MEMIF_ERR_DISCONNECTED;
1526 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1527 run_args.num_s2m_rings;
1528 if (EXPECT_FALSE (qid >= num))
1529 return MEMIF_ERR_QID;
1530 if (EXPECT_FALSE (!count_out))
1531 return MEMIF_ERR_INVAL_ARG;
1533 memif_socket_t *ms = (memif_socket_t *) c->args.socket;
1534 memif_queue_t *mq = &c->tx_queues[qid];
1535 memif_ring_t *ring = mq->ring;
1537 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1538 uint32_t offset_mask = c->run_args.buffer_size - 1;
1541 int err = MEMIF_ERR_SUCCESS; /* 0 */
1542 uint16_t dst_left, src_left;
1543 uint16_t saved_count;
1544 uint16_t saved_next_buf;
1546 memif_buffer_t *saved_b;
1549 ring_size = (1 << mq->log2_ring_size);
1551 if (c->args.is_master)
1552 ns = ring->head - mq->next_buf;
1554 ns = ring_size - mq->next_buf + ring->tail;
1558 b0 = (bufs + *count_out);
1561 saved_count = count;
1562 saved_next_buf = mq->next_buf;
1564 b0->desc_index = mq->next_buf;
1565 ring->desc[mq->next_buf & mask].flags = 0;
1567 /* slave can produce buffer with original length */
1568 dst_left = (c->args.is_master) ? ring->desc[mq->next_buf & mask].length :
1569 c->run_args.buffer_size;
1574 if (EXPECT_FALSE (dst_left == 0))
1582 ring->desc[b0->desc_index & mask].flags |=
1583 MEMIF_DESC_FLAG_NEXT;
1584 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1586 b0 = (bufs + *count_out);
1587 b0->desc_index = mq->next_buf;
1588 dst_left = (c->args.is_master) ?
1589 ring->desc[mq->next_buf & mask].length :
1590 c->run_args.buffer_size;
1591 ring->desc[mq->next_buf & mask].flags = 0;
1595 /* rollback allocated chain buffers */
1596 memset (saved_b, 0, sizeof (memif_buffer_t)
1597 * (saved_count - count + 1));
1598 *count_out -= saved_count - count;
1599 mq->next_buf = saved_next_buf;
1603 b0->len = memif_min (dst_left, src_left);
1605 /* slave resets buffer offset */
1606 if (c->args.is_master == 0)
1608 memif_desc_t *d = &ring->desc[slot & mask];
1609 if (ms->get_external_buffer_offset)
1610 d->offset = ms->get_external_buffer_offset (c->private_ctx);
1612 d->offset = d->offset - (d->offset & offset_mask);
1614 b0->data = memif_get_buffer (c, ring, mq->next_buf & mask);
1616 src_left -= b0->len;
1617 dst_left -= b0->len;
1628 DBG ("allocated: %u/%u bufs. Next buffer pointer %d", *count_out, count,
1633 DBG ("ring buffer full! qid: %u", qid);
1634 err = MEMIF_ERR_NOBUF_RING;
1641 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1644 memif_connection_t *c = (memif_connection_t *) conn;
1645 if (EXPECT_FALSE (c == NULL))
1646 return MEMIF_ERR_NOCONN;
1647 if (EXPECT_FALSE (c->control_channel == NULL))
1648 return MEMIF_ERR_DISCONNECTED;
1650 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1651 run_args.num_m2s_rings;
1652 if (EXPECT_FALSE (qid >= num))
1653 return MEMIF_ERR_QID;
1654 memif_socket_t *ms = (memif_socket_t *) c->args.socket;
1655 memif_queue_t *mq = &c->rx_queues[qid];
1656 memif_ring_t *ring = mq->ring;
1657 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1658 uint32_t offset_mask = c->run_args.buffer_size - 1;
1659 uint16_t slot, counter = 0;
1661 if (c->args.is_master)
1663 MEMIF_MEMORY_BARRIER ();
1665 (ring->tail + count <=
1666 mq->last_head) ? ring->tail + count : mq->last_head;
1667 return MEMIF_ERR_SUCCESS;
1670 uint16_t head = ring->head;
1672 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1673 count = (count < ns) ? count : ns;
1676 while (counter < count)
1678 d = &ring->desc[slot & mask];
1680 d->length = c->run_args.buffer_size - headroom;
1681 if (ms->get_external_buffer_offset)
1682 d->offset = ms->get_external_buffer_offset (c->private_ctx);
1684 d->offset = d->offset - (d->offset & offset_mask) + headroom;
1689 MEMIF_MEMORY_BARRIER ();
1692 return MEMIF_ERR_SUCCESS; /* 0 */
1696 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1697 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1699 memif_connection_t *c = (memif_connection_t *) conn;
1700 if (EXPECT_FALSE (c == NULL))
1701 return MEMIF_ERR_NOCONN;
1702 if (EXPECT_FALSE (c->control_channel == NULL))
1703 return MEMIF_ERR_DISCONNECTED;
1705 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1706 run_args.num_s2m_rings;
1707 if (EXPECT_FALSE (qid >= num))
1708 return MEMIF_ERR_QID;
1709 if (EXPECT_FALSE (!tx))
1710 return MEMIF_ERR_INVAL_ARG;
1712 memif_queue_t *mq = &c->tx_queues[qid];
1713 memif_ring_t *ring = mq->ring;
1714 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1715 uint32_t offset_mask = c->run_args.buffer_size - 1;
1718 int64_t data_offset;
1720 int err = MEMIF_ERR_SUCCESS;
1722 if (EXPECT_FALSE (count == 0))
1723 return MEMIF_ERR_SUCCESS;
1726 if (c->args.is_master)
1734 /* set error to MEMIF_ERR_INVAL_ARG and finish the sending process
1736 if ((b0->desc_index & mask) != (index & mask))
1738 err = MEMIF_ERR_INVAL_ARG;
1741 d = &ring->desc[b0->desc_index & mask];
1742 d->length = b0->len;
1743 if (!c->args.is_master)
1746 d->offset = d->offset - (d->offset & offset_mask);
1747 // calculate offset from user data
1748 data_offset = b0->data - (d->offset + c->regions[d->region].addr);
1749 if (data_offset != 0)
1751 /* verify data offset and buffer length */
1752 if ((data_offset < 0) ||
1753 ((data_offset + b0->len) > c->run_args.buffer_size))
1755 DBG ("slot: %d, data_offset: %ld, length: %d",
1756 b0->desc_index & mask, data_offset, b0->len);
1757 err = MEMIF_ERR_INVAL_ARG;
1760 d->offset += data_offset;
1764 #ifdef MEMIF_DBG_SHM
1765 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1766 printf ("data: %p\n",
1767 memif_get_buffer (c, ring, b0->desc_index & mask));
1768 printf ("index: %u\n", b0->desc_index);
1769 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1770 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1771 #endif /* MEMIF_DBG_SHM */
1779 MEMIF_MEMORY_BARRIER ();
1780 if (c->args.is_master)
1781 ring->tail = b0->desc_index + 1;
1783 ring->head = b0->desc_index + 1;
1785 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1788 int r = write (mq->int_fd, &a, sizeof (a));
1790 return MEMIF_ERR_INT_WRITE;
1797 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1798 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1800 memif_connection_t *c = (memif_connection_t *) conn;
1801 if (EXPECT_FALSE (c == NULL))
1802 return MEMIF_ERR_NOCONN;
1803 if (EXPECT_FALSE (c->control_channel == NULL))
1804 return MEMIF_ERR_DISCONNECTED;
1806 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1807 run_args.num_m2s_rings;
1808 if (EXPECT_FALSE (qid >= num))
1809 return MEMIF_ERR_QID;
1810 if (EXPECT_FALSE (!rx))
1811 return MEMIF_ERR_INVAL_ARG;
1813 memif_queue_t *mq = &c->rx_queues[qid];
1814 memif_ring_t *ring = mq->ring;
1815 uint16_t cur_slot, last_slot;
1817 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1824 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1825 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1826 if (cur_slot == last_slot)
1828 r = read (mq->int_fd, &b, sizeof (b));
1829 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1830 return memif_syscall_error_handler (errno);
1832 return MEMIF_ERR_SUCCESS;
1835 ns = last_slot - cur_slot;
1841 b0->desc_index = cur_slot;
1842 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1843 b0->len = ring->desc[cur_slot & mask].length;
1844 /* slave resets buffer length */
1845 if (c->args.is_master == 0)
1847 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1850 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1852 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1853 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1857 #ifdef MEMIF_DBG_SHM
1858 printf ("data: %p\n", b0->data);
1859 printf ("index: %u\n", b0->desc_index);
1860 printf ("queue: %p\n", b0->queue);
1861 print_bytes (b0->data, b0->len, DBG_RX_BUF);
1862 #endif /* MEMIF_DBG_SHM */
1870 if (c->args.is_master)
1871 mq->last_head = cur_slot;
1873 mq->last_tail = cur_slot;
1877 DBG ("not enough buffers!");
1878 return MEMIF_ERR_NOBUF;
1881 r = read (mq->int_fd, &b, sizeof (b));
1882 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1883 return memif_syscall_error_handler (errno);
1885 return MEMIF_ERR_SUCCESS; /* 0 */
1889 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1890 char *buf, ssize_t buflen)
1892 memif_connection_t *c = (memif_connection_t *) conn;
1894 int err = MEMIF_ERR_SUCCESS, i;
1898 return MEMIF_ERR_NOCONN;
1900 ms = (memif_socket_t *) c->args.socket;
1902 l1 = strlen ((char *) c->args.interface_name);
1903 if (l0 + l1 < buflen)
1906 (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
1910 err = MEMIF_ERR_NOBUF_DET;
1912 l1 = strlen ((char *) ms->args.app_name);
1913 if (l0 + l1 < buflen)
1916 (uint8_t *) strcpy (buf + l0, (char *) ms->args.app_name);
1920 err = MEMIF_ERR_NOBUF_DET;
1922 l1 = strlen ((char *) c->remote_if_name);
1923 if (l0 + l1 < buflen)
1925 md->remote_if_name =
1926 (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
1930 err = MEMIF_ERR_NOBUF_DET;
1932 l1 = strlen ((char *) c->remote_name);
1933 if (l0 + l1 < buflen)
1935 md->remote_inst_name =
1936 (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
1940 err = MEMIF_ERR_NOBUF_DET;
1942 md->id = c->args.interface_id;
1944 if (strlen ((char *) c->args.secret) > 0)
1946 l1 = strlen ((char *) c->args.secret);
1947 if (l0 + l1 < buflen)
1949 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
1953 err = MEMIF_ERR_NOBUF_DET;
1956 md->role = (c->args.is_master) ? 0 : 1;
1957 md->mode = c->args.mode;
1960 if (l0 + l1 < buflen)
1962 md->socket_path = (uint8_t *) memcpy (buf + l0, ms->args.path, 108);
1966 err = MEMIF_ERR_NOBUF_DET;
1968 l1 = strlen ((char *) c->remote_disconnect_string);
1969 if (l0 + l1 < buflen)
1972 (uint8_t *) strcpy (buf + l0, (char *) c->remote_disconnect_string);
1976 err = MEMIF_ERR_NOBUF_DET;
1978 md->regions_num = c->regions_num;
1979 l1 = sizeof (memif_region_details_t) * md->regions_num;
1980 if (l0 + l1 <= buflen)
1982 md->regions = (memif_region_details_t *) (buf + l0);
1983 for (i = 0; i < md->regions_num; i++)
1985 md->regions[i].index = i;
1986 md->regions[i].addr = c->regions[i].addr;
1987 md->regions[i].size = c->regions[i].region_size;
1988 md->regions[i].fd = c->regions[i].fd;
1989 md->regions[i].is_external = c->regions[i].is_external;
1994 err = MEMIF_ERR_NOBUF_DET;
1997 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1998 run_args.num_m2s_rings;
2000 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
2001 if (l0 + l1 <= buflen)
2003 md->rx_queues = (memif_queue_details_t *) (buf + l0);
2004 for (i = 0; i < md->rx_queues_num; i++)
2006 md->rx_queues[i].region = c->rx_queues[i].region;
2007 md->rx_queues[i].qid = i;
2008 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2009 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2010 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2011 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2012 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2017 err = MEMIF_ERR_NOBUF_DET;
2020 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
2021 run_args.num_s2m_rings;
2023 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2024 if (l0 + l1 <= buflen)
2026 md->tx_queues = (memif_queue_details_t *) (buf + l0);
2027 for (i = 0; i < md->tx_queues_num; i++)
2029 md->tx_queues[i].region = c->tx_queues[i].region;
2030 md->tx_queues[i].qid = i;
2031 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2032 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2033 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2034 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2035 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2040 err = MEMIF_ERR_NOBUF_DET;
2042 /* This is not completely true, clients should relay on
2043 * on_connect/on_disconnect callbacks */
2044 md->link_up_down = (c->control_channel != NULL) ? 1 : 0;
2050 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2052 memif_connection_t *c = (memif_connection_t *) conn;
2057 return MEMIF_ERR_NOCONN;
2058 if (c->control_channel == NULL)
2059 return MEMIF_ERR_DISCONNECTED;
2062 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2063 run_args.num_m2s_rings;
2065 return MEMIF_ERR_QID;
2067 *efd = c->rx_queues[qid].int_fd;
2069 return MEMIF_ERR_SUCCESS;