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 /* Handle abstract socket by converting '@' -> '\0' */
504 if (ms->args.path[0] == '@')
505 ms->args.path[0] = '\0';
506 ms->private_ctx = private_ctx;
508 if (ms->args.alloc == NULL)
509 memif_alloc_register (ms, malloc);
510 if (ms->args.realloc == NULL)
511 memif_realloc_register (ms, realloc);
512 if (ms->args.free == NULL)
513 memif_free_register (ms, free);
515 TAILQ_INIT (&ms->master_interfaces);
516 TAILQ_INIT (&ms->slave_interfaces);
518 /* FIXME: implement connection request timer */
520 /* initialize internal epoll */
521 if (ms->args.on_control_fd_update == NULL)
523 ms->epfd = epoll_create (1);
524 /* register default fd update callback */
525 memif_control_fd_update_register (ms, memif_control_fd_update);
526 ms->poll_cancel_fd = eventfd (0, EFD_NONBLOCK);
527 if (ms->poll_cancel_fd < 0)
530 DBG ("eventfd: %s", strerror (err));
531 return memif_syscall_error_handler (err);
533 /* add interrupt fd to epfd */
534 fdata = ms->args.alloc (sizeof (*fdata));
535 fdata->event_handler = memif_poll_cancel_handler;
536 fdata->private_ctx = ms;
538 fde.fd = ms->poll_cancel_fd;
539 fde.type = MEMIF_FD_EVENT_READ;
540 fde.private_ctx = fdata;
542 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
543 ms->args.on_control_fd_update (fde, ctx);
547 memif_set_connection_request_timer (ms, ms->args.connection_request_timer);
548 if (err != MEMIF_ERR_SUCCESS)
561 if (ms->poll_cancel_fd != -1)
562 close (ms->poll_cancel_fd);
567 memif_socket_handle_t
568 memif_get_socket_handle (memif_conn_handle_t conn)
570 memif_connection_t *c = (memif_connection_t *) conn;
575 return c->args.socket;
579 memif_get_socket_path (memif_socket_handle_t sock)
581 memif_socket_t *ms = (memif_socket_t *) sock;
586 return ms->args.path;
590 memif_get_listener_fd (memif_socket_handle_t sock)
592 memif_socket_t *ms = (memif_socket_t *) sock;
597 return ms->listener_fd;
601 memif_set_listener_fd (memif_socket_handle_t sock, int fd)
603 memif_socket_t *ms = (memif_socket_t *) sock;
604 memif_fd_event_t fde;
605 memif_fd_event_data_t *fdata;
608 if ((ms == NULL) || (fd < 0))
609 return MEMIF_ERR_INVAL_ARG;
611 fdata = ms->args.alloc (sizeof (*fdata));
613 return MEMIF_ERR_NOMEM;
615 ms->listener_fd = fd;
617 fdata->event_handler = memif_listener_handler;
618 fdata->private_ctx = ms;
619 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
620 /* send fd to epoll */
621 fde.fd = ms->listener_fd;
622 fde.type = MEMIF_FD_EVENT_READ;
623 fde.private_ctx = fdata;
624 ms->args.on_control_fd_update (fde, ctx);
626 return MEMIF_ERR_SUCCESS;
630 memif_create (memif_conn_handle_t *c, memif_conn_args_t *args,
631 memif_connection_update_t *on_connect,
632 memif_connection_update_t *on_disconnect,
633 memif_on_interrupt_t *on_interrupt, void *private_ctx)
636 memif_connection_t *conn = (memif_connection_t *) * c;
637 memif_socket_t *ms = (memif_socket_t *) args->socket;
641 DBG ("This handle already points to existing memif.");
642 return MEMIF_ERR_CONN;
647 DBG ("Missing memif socket");
648 return MEMIF_ERR_INVAL_ARG;
651 conn = (memif_connection_t *) ms->args.alloc (sizeof (*conn));
654 err = MEMIF_ERR_NOMEM;
657 memset (conn, 0, sizeof (memif_connection_t));
659 conn->args.interface_id = args->interface_id;
661 if (args->log2_ring_size == 0)
662 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
663 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
665 err = MEMIF_ERR_MAX_RING;
668 if (args->buffer_size == 0)
669 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
670 if (args->num_s2m_rings == 0)
671 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
672 if (args->num_m2s_rings == 0)
673 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
675 conn->args.num_s2m_rings = args->num_s2m_rings;
676 conn->args.num_m2s_rings = args->num_m2s_rings;
677 conn->args.buffer_size = args->buffer_size;
678 conn->args.log2_ring_size = args->log2_ring_size;
679 conn->args.is_master = args->is_master;
680 conn->args.mode = args->mode;
681 conn->args.socket = args->socket;
682 conn->regions = NULL;
683 conn->tx_queues = NULL;
684 conn->rx_queues = NULL;
685 conn->control_channel = NULL;
686 conn->on_connect = on_connect;
687 conn->on_disconnect = on_disconnect;
688 conn->on_interrupt = on_interrupt;
689 conn->private_ctx = private_ctx;
690 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
692 uint8_t l = sizeof (conn->args.interface_name);
693 strlcpy ((char *) conn->args.interface_name, (char *) args->interface_name,
696 if ((l = strlen ((char *) args->secret)) > 0)
697 strlcpy ((char *) conn->args.secret, (char *) args->secret,
698 sizeof (conn->args.secret));
701 TAILQ_INSERT_TAIL (&ms->master_interfaces, conn, next);
703 TAILQ_INSERT_TAIL (&ms->slave_interfaces, conn, next);
705 err = memif_request_connection (conn);
706 if (err != MEMIF_ERR_SUCCESS && err != MEMIF_ERR_CONNREFUSED)
709 TAILQ_REMOVE (&ms->master_interfaces, conn, next);
711 TAILQ_REMOVE (&ms->slave_interfaces, conn, next);
721 ms->args.free (conn);
727 memif_request_connection (memif_conn_handle_t c)
729 memif_connection_t *conn = (memif_connection_t *) c;
731 int err = MEMIF_ERR_SUCCESS;
733 struct sockaddr_un un = { 0 };
734 struct stat file_stat;
736 memif_control_channel_t *cc = NULL;
737 memif_fd_event_t fde;
738 memif_fd_event_data_t *fdata = NULL;
742 return MEMIF_ERR_NOCONN;
744 ms = (memif_socket_t *) conn->args.socket;
746 /* if control channel is assigned, the interface is either connected or
748 if (conn->control_channel != NULL)
749 return MEMIF_ERR_ALRCONN;
750 /* if interface is master and the socket is already listener we are done */
751 if (conn->args.is_master && (ms->listener_fd != -1))
752 return MEMIF_ERR_SUCCESS;
754 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
757 err = memif_syscall_error_handler (errno);
761 un.sun_family = AF_UNIX;
763 /* use memcpy to support abstract socket
764 * ms->args.path is already a valid socket path
766 memcpy (un.sun_path, ms->args.path, sizeof (un.sun_path) - 1);
768 /* allocate fd event data */
769 fdata = ms->args.alloc (sizeof (*fdata));
772 err = MEMIF_ERR_NOMEM;
776 if (conn->args.is_master != 0)
778 /* Configure socket optins */
779 if (setsockopt (sockfd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
781 err = memif_syscall_error_handler (errno);
784 if (bind (sockfd, (struct sockaddr *) &un, sizeof (un)) < 0)
786 err = memif_syscall_error_handler (errno);
789 if (listen (sockfd, 1) < 0)
791 err = memif_syscall_error_handler (errno);
794 if (ms->args.path[0] != '\0')
796 /* Verify that the socket was created */
797 if (stat ((char *) ms->args.path, &file_stat) < 0)
799 err = memif_syscall_error_handler (errno);
804 /* assign listener fd */
805 ms->listener_fd = sockfd;
807 fdata->event_handler = memif_listener_handler;
808 fdata->private_ctx = ms;
812 cc = ms->args.alloc (sizeof (*cc));
815 err = MEMIF_ERR_NOMEM;
818 if (connect (sockfd, (struct sockaddr *) &un,
819 sizeof (struct sockaddr_un)) != 0)
821 err = MEMIF_ERR_CONNREFUSED;
825 /* Create control channel */
829 TAILQ_INIT (&cc->msg_queue);
831 /* assign control channel to endpoint */
832 conn->control_channel = cc;
834 fdata->event_handler = memif_control_channel_handler;
835 fdata->private_ctx = cc;
838 /* if event polling is done internally, send memif socket as context */
839 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
840 /* send fd to epoll */
842 fde.type = MEMIF_FD_EVENT_READ;
843 fde.private_ctx = fdata;
844 ms->args.on_control_fd_update (fde, ctx);
853 ms->args.free (fdata);
857 conn->control_channel = cc = NULL;
862 memif_control_fd_handler (void *ptr, memif_fd_event_type_t events)
864 memif_fd_event_data_t *fdata = (memif_fd_event_data_t *) ptr;
867 return MEMIF_ERR_INVAL_ARG;
869 return fdata->event_handler (events, fdata->private_ctx);
873 memif_interrupt_handler (memif_fd_event_type_t type, void *private_ctx)
875 memif_interrupt_t *idata = (memif_interrupt_t *) private_ctx;
878 return MEMIF_ERR_INVAL_ARG;
880 return idata->c->on_interrupt (idata->c, idata->c->private_ctx, idata->qid);
884 memif_poll_event (memif_socket_handle_t sock, int timeout)
886 memif_socket_t *ms = (memif_socket_t *) sock;
887 struct epoll_event evt;
888 int en = 0, err = MEMIF_ERR_SUCCESS; /* 0 */
889 memif_fd_event_type_t events = 0;
890 uint64_t counter = 0;
895 return MEMIF_ERR_INVAL_ARG;
897 memset (&evt, 0, sizeof (evt));
898 evt.events = EPOLLIN | EPOLLOUT;
899 sigemptyset (&sigset);
900 en = epoll_pwait (ms->epfd, &evt, 1, timeout, &sigset);
904 DBG ("epoll_pwait: %s", strerror (err));
905 return memif_syscall_error_handler (err);
909 if (evt.events & EPOLLIN)
910 events |= MEMIF_FD_EVENT_READ;
911 if (evt.events & EPOLLOUT)
912 events |= MEMIF_FD_EVENT_WRITE;
913 if (evt.events & EPOLLERR)
914 events |= MEMIF_FD_EVENT_ERROR;
915 return memif_control_fd_handler (evt.data.ptr, events);
917 return MEMIF_ERR_SUCCESS;
921 memif_cancel_poll_event (memif_socket_handle_t sock)
923 memif_socket_t *ms = (memif_socket_t *) sock;
924 uint64_t counter = 1;
927 if (ms->poll_cancel_fd == -1)
928 return MEMIF_ERR_INVAL_ARG;
929 w = write (ms->poll_cancel_fd, &counter, sizeof (counter));
930 if (w < sizeof (counter))
931 return MEMIF_ERR_INT_WRITE;
933 return MEMIF_ERR_SUCCESS;
937 memif_close_queues (memif_socket_t *ms, memif_queue_t *queues, int nqueues)
939 memif_fd_event_t fde;
944 for (i = 0; i < nqueues; i++)
951 /* Stop listening for events */
953 fde.type = MEMIF_FD_EVENT_DEL;
954 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
955 ms->args.on_control_fd_update (fde, ctx);
963 /* send disconnect msg and close interface */
965 memif_disconnect_internal (memif_connection_t * c)
967 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
969 memif_socket_t *ms = (memif_socket_t *) c->args.socket;
970 memif_fd_event_t fde;
973 c->on_disconnect ((void *) c, c->private_ctx);
975 /* Delete control channel */
976 if (c->control_channel != NULL)
977 memif_delete_control_channel (c->control_channel);
979 if (c->tx_queues != NULL)
981 memif_close_queues (ms, c->tx_queues, c->tx_queues_num);
982 ms->args.free (c->tx_queues);
985 c->tx_queues_num = 0;
987 if (c->rx_queues != NULL)
989 memif_close_queues (ms, c->rx_queues, c->rx_queues_num);
990 ms->args.free (c->rx_queues);
993 c->rx_queues_num = 0;
995 /* TODO: Slave reuse regions */
997 for (i = 0; i < c->regions_num; i++)
999 if (&c->regions[i] == NULL)
1001 if (c->regions[i].is_external != 0)
1003 ms->del_external_region (c->regions[i].addr,
1004 c->regions[i].region_size, c->regions[i].fd,
1009 if (munmap (c->regions[i].addr, c->regions[i].region_size) < 0)
1010 return memif_syscall_error_handler (errno);
1011 if (c->regions[i].fd > 0)
1012 close (c->regions[i].fd);
1013 c->regions[i].fd = -1;
1016 ms->args.free (c->regions);
1020 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1026 memif_get_socket_filename (memif_socket_handle_t sock)
1028 memif_socket_t *ms = (memif_socket_t *) sock;
1033 return (char *) ms->args.path;
1037 memif_delete_socket (memif_socket_handle_t * sock)
1039 memif_socket_t *ms = (memif_socket_t *) * sock;
1040 memif_fd_event_t fde;
1043 /* check if socket is in use */
1044 if (ms == NULL || !TAILQ_EMPTY (&ms->master_interfaces) ||
1045 !TAILQ_EMPTY (&ms->slave_interfaces))
1046 return MEMIF_ERR_INVAL_ARG;
1048 if (ms->listener_fd > 0)
1050 fde.fd = ms->listener_fd;
1051 fde.type = MEMIF_FD_EVENT_DEL;
1052 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
1053 ms->args.on_control_fd_update (fde, ctx);
1055 ms->listener_fd = -1;
1057 if (ms->poll_cancel_fd > 0)
1059 fde.fd = ms->poll_cancel_fd;
1060 fde.type = MEMIF_FD_EVENT_DEL;
1061 ctx = ms->epfd != -1 ? ms : ms->private_ctx;
1062 ms->args.on_control_fd_update (fde, ctx);
1064 ms->poll_cancel_fd = -1;
1073 return MEMIF_ERR_SUCCESS;
1077 memif_delete (memif_conn_handle_t * conn)
1079 memif_connection_t *c = (memif_connection_t *) * conn;
1081 int err = MEMIF_ERR_SUCCESS;
1085 DBG ("no connection");
1086 return MEMIF_ERR_NOCONN;
1089 err = memif_disconnect_internal (c);
1091 ms = (memif_socket_t *) c->args.socket;
1093 if (c->args.is_master)
1094 TAILQ_REMOVE (&ms->master_interfaces, c, next);
1096 TAILQ_REMOVE (&ms->slave_interfaces, c, next);
1097 /* TODO: don't listen with empty interface queue */
1107 memif_connect1 (memif_connection_t * c)
1115 return MEMIF_ERR_INVAL_ARG;
1117 ms = (memif_socket_t *) c->args.socket;
1119 for (i = 0; i < c->regions_num; i++)
1121 mr = &c->regions[i];
1126 if (mr->is_external)
1128 if (ms->get_external_region_addr == NULL)
1129 return MEMIF_ERR_INVAL_ARG;
1130 mr->addr = ms->get_external_region_addr (
1131 mr->region_size, mr->fd, c->private_ctx);
1136 return MEMIF_ERR_NO_SHMFD;
1139 mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1140 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1142 return memif_syscall_error_handler (errno);
1149 for (i = 0; i < c->rx_queues_num; i++)
1151 mq = &c->rx_queues[i];
1154 mq->ring = c->regions[mq->region].addr + mq->offset;
1155 if (mq->ring->cookie != MEMIF_COOKIE)
1157 DBG ("wrong cookie on rx ring %u", i);
1158 return MEMIF_ERR_COOKIE;
1160 mq->ring->head = mq->ring->tail = mq->last_head = mq->next_buf = 0;
1164 for (i = 0; i < c->tx_queues_num; i++)
1166 mq = &c->tx_queues[i];
1169 mq->ring = c->regions[mq->region].addr + mq->offset;
1170 if (mq->ring->cookie != MEMIF_COOKIE)
1172 DBG ("wrong cookie on tx ring %u", i);
1173 return MEMIF_ERR_COOKIE;
1175 mq->ring->head = mq->ring->tail = mq->last_head = mq->next_buf = 0;
1183 memif_add_region (memif_connection_t *conn, uint8_t has_buffers)
1186 memif_socket_t *ms = (memif_socket_t *) conn->args.socket;
1188 r = ms->args.realloc (conn->regions,
1189 sizeof (memif_region_t) * ++conn->regions_num);
1191 return MEMIF_ERR_NOMEM;
1194 r = &conn->regions[conn->regions_num - 1];
1195 memset (r, 0, sizeof (memif_region_t));
1197 if (has_buffers != 0)
1199 r->buffer_offset = 0;
1204 (conn->run_args.num_s2m_rings +
1205 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1206 sizeof (memif_desc_t) *
1208 run_args.log2_ring_size));
1211 r->region_size = (has_buffers == 0) ? r->buffer_offset : r->buffer_offset +
1212 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1213 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1215 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1216 return memif_syscall_error_handler (errno);
1218 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1219 return memif_syscall_error_handler (errno);
1221 if ((ftruncate (r->fd, r->region_size)) == -1)
1222 return memif_syscall_error_handler (errno);
1224 if ((r->addr = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1225 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1226 return memif_syscall_error_handler (errno);
1228 return MEMIF_ERR_SUCCESS;
1232 memif_init_queues (memif_connection_t *conn)
1236 memif_socket_t *ms = (memif_socket_t *) conn->args.socket;
1238 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1240 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1241 DBG ("RING: %p I: %d", ring, i);
1242 ring->head = ring->tail = 0;
1243 ring->cookie = MEMIF_COOKIE;
1245 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1247 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1248 ring->desc[j].region = 1;
1249 ring->desc[j].offset =
1250 conn->regions[1].buffer_offset +
1251 (uint32_t) (slot * conn->run_args.buffer_size);
1252 ring->desc[j].length = conn->run_args.buffer_size;
1255 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1257 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1258 DBG ("RING: %p I: %d", ring, i);
1259 ring->head = ring->tail = 0;
1260 ring->cookie = MEMIF_COOKIE;
1262 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1264 uint16_t slot = (i + conn->run_args.num_s2m_rings) *
1265 (1 << conn->run_args.log2_ring_size) + j;
1266 ring->desc[j].region = 1;
1267 ring->desc[j].offset =
1268 conn->regions[1].buffer_offset +
1269 (uint32_t) (slot * conn->run_args.buffer_size);
1270 ring->desc[j].length = conn->run_args.buffer_size;
1274 mq = (memif_queue_t *) ms->args.alloc (sizeof (memif_queue_t) *
1275 conn->run_args.num_s2m_rings);
1277 return MEMIF_ERR_NOMEM;
1281 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1283 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1284 return memif_syscall_error_handler (errno);
1286 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1287 DBG ("RING: %p I: %d", mq[x].ring, x);
1288 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1291 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1292 mq[x].last_head = mq[x].last_tail = 0;
1295 conn->tx_queues = mq;
1296 conn->tx_queues_num = conn->run_args.num_s2m_rings;
1298 mq = (memif_queue_t *) ms->args.alloc (sizeof (memif_queue_t) *
1299 conn->run_args.num_m2s_rings);
1301 return MEMIF_ERR_NOMEM;
1303 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1305 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1306 return memif_syscall_error_handler (errno);
1308 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1309 DBG ("RING: %p I: %d", mq[x].ring, x);
1310 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1313 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1314 mq[x].last_head = mq[x].last_tail = 0;
1317 conn->rx_queues = mq;
1318 conn->rx_queues_num = conn->run_args.num_m2s_rings;
1320 return MEMIF_ERR_SUCCESS;
1324 memif_init_regions_and_queues (memif_connection_t * conn)
1327 memif_socket_t *ms = (memif_socket_t *) conn->args.socket;
1329 /* region 0. rings */
1330 memif_add_region (conn, /* has_buffers */ 0);
1332 /* region 1. buffers */
1333 if (ms->add_external_region)
1335 r = (memif_region_t *) ms->args.realloc (
1336 conn->regions, sizeof (memif_region_t) * ++conn->regions_num);
1338 return MEMIF_ERR_NOMEM;
1341 conn->regions[1].region_size =
1342 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1343 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1344 conn->regions[1].buffer_offset = 0;
1345 ms->add_external_region (&conn->regions[1].addr,
1346 conn->regions[1].region_size,
1347 &conn->regions[1].fd, conn->private_ctx);
1348 conn->regions[1].is_external = 1;
1352 memif_add_region (conn, 1);
1355 memif_init_queues (conn);
1361 memif_set_next_free_buffer (memif_conn_handle_t conn, uint16_t qid,
1362 memif_buffer_t *buf)
1364 memif_connection_t *c = (memif_connection_t *) conn;
1365 if (EXPECT_FALSE (c == NULL))
1366 return MEMIF_ERR_NOCONN;
1367 if (EXPECT_FALSE (qid >= c->tx_queues_num))
1368 return MEMIF_ERR_QID;
1369 if (EXPECT_FALSE (buf == NULL))
1370 return MEMIF_ERR_INVAL_ARG;
1372 uint16_t ring_size, ns;
1373 memif_queue_t *mq = &c->tx_queues[qid];
1374 memif_ring_t *ring = mq->ring;
1376 ring_size = (1 << mq->log2_ring_size);
1377 if (c->args.is_master)
1378 ns = ring->head - mq->next_buf;
1380 ns = ring_size - mq->next_buf + ring->tail;
1382 if ((mq->next_buf - buf->desc_index) > ns)
1383 return MEMIF_ERR_INVAL_ARG;
1385 mq->next_buf = buf->desc_index;
1387 return MEMIF_ERR_SUCCESS;
1391 memif_buffer_enq_at_idx_internal (memif_queue_t *from_q, memif_queue_t *to_q,
1392 memif_buffer_t *buf, uint16_t slot)
1394 uint16_t from_mask = (1 << from_q->log2_ring_size) - 1;
1395 uint16_t to_mask = (1 << to_q->log2_ring_size) - 1;
1396 memif_desc_t *from_d, *to_d, tmp_d;
1398 /* Get the descriptors */
1399 from_d = &from_q->ring->desc[buf->desc_index & from_mask];
1400 to_d = &to_q->ring->desc[slot & to_mask];
1402 /* Swap descriptors */
1407 /* Update descriptor index and queue for clients buffer */
1408 buf->desc_index = slot;
1413 memif_buffer_requeue (memif_conn_handle_t conn, memif_buffer_t *buf_a,
1414 memif_buffer_t *buf_b)
1416 memif_connection_t *c = (memif_connection_t *) conn;
1417 if (EXPECT_FALSE (c == NULL))
1418 return MEMIF_ERR_NOCONN;
1419 if (EXPECT_FALSE (c->args.is_master))
1420 return MEMIF_ERR_INVAL_ARG;
1421 if ((buf_a == NULL) || (buf_b == NULL))
1422 return MEMIF_ERR_INVAL_ARG;
1425 /* store buf_a information */
1426 uint16_t index_a = buf_a->desc_index;
1427 memif_queue_t *mq_a = buf_a->queue;
1429 /* swap buffers, buf_a was updated with new desc_index and queue */
1430 memif_buffer_enq_at_idx_internal ((memif_queue_t *) buf_a->queue,
1431 (memif_queue_t *) buf_b->queue, buf_a,
1434 /* update buf_b desc_index and queue */
1435 buf_b->desc_index = index_a;
1436 buf_b->queue = mq_a;
1438 return MEMIF_ERR_SUCCESS;
1442 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1443 memif_buffer_t * bufs, uint16_t count,
1444 uint16_t * count_out)
1446 memif_connection_t *c = (memif_connection_t *) conn;
1447 if (EXPECT_FALSE (c == NULL))
1448 return MEMIF_ERR_NOCONN;
1449 if (EXPECT_FALSE (c->control_channel == NULL))
1450 return MEMIF_ERR_DISCONNECTED;
1451 if (EXPECT_FALSE (qid >= c->tx_queues_num))
1452 return MEMIF_ERR_QID;
1453 if (EXPECT_FALSE (!count_out))
1454 return MEMIF_ERR_INVAL_ARG;
1455 if (EXPECT_FALSE (c->args.is_master))
1456 return MEMIF_ERR_INVAL_ARG;
1458 memif_queue_t *mq = &c->tx_queues[qid];
1459 memif_ring_t *ring = mq->ring;
1461 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1465 int err = MEMIF_ERR_SUCCESS; /* 0 */
1468 ring_size = (1 << mq->log2_ring_size);
1470 /* can only be called by slave */
1471 ns = ring_size - mq->next_buf + ring->tail;
1477 /* Swaps the descriptors, updates next_buf pointer and updates client
1480 memif_buffer_enq_at_idx_internal ((memif_queue_t *) b0->queue, mq, b0,
1483 mq->next_buf++; /* mark the buffer as allocated */
1490 DBG ("allocated: %u/%u bufs. Next buffer pointer %d", *count_out, count,
1495 DBG ("ring buffer full! qid: %u", qid);
1496 err = MEMIF_ERR_NOBUF_RING;
1503 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1504 memif_buffer_t * bufs, uint16_t count,
1505 uint16_t * count_out, uint16_t size)
1507 memif_connection_t *c = (memif_connection_t *) conn;
1508 if (EXPECT_FALSE (c == NULL))
1509 return MEMIF_ERR_NOCONN;
1510 if (EXPECT_FALSE (c->control_channel == NULL))
1511 return MEMIF_ERR_DISCONNECTED;
1513 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1514 run_args.num_s2m_rings;
1515 if (EXPECT_FALSE (qid >= num))
1516 return MEMIF_ERR_QID;
1517 if (EXPECT_FALSE (!count_out))
1518 return MEMIF_ERR_INVAL_ARG;
1520 memif_socket_t *ms = (memif_socket_t *) c->args.socket;
1521 memif_queue_t *mq = &c->tx_queues[qid];
1522 memif_ring_t *ring = mq->ring;
1524 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1525 uint32_t offset_mask = c->run_args.buffer_size - 1;
1528 int err = MEMIF_ERR_SUCCESS; /* 0 */
1529 uint16_t dst_left, src_left;
1530 uint16_t saved_count;
1531 uint16_t saved_next_buf;
1533 memif_buffer_t *saved_b;
1536 ring_size = (1 << mq->log2_ring_size);
1538 if (c->args.is_master)
1539 ns = ring->head - mq->next_buf;
1541 ns = ring_size - mq->next_buf + ring->tail;
1545 b0 = (bufs + *count_out);
1548 saved_count = count;
1549 saved_next_buf = mq->next_buf;
1551 b0->desc_index = mq->next_buf;
1552 ring->desc[mq->next_buf & mask].flags = 0;
1554 /* slave can produce buffer with original length */
1555 dst_left = (c->args.is_master) ? ring->desc[mq->next_buf & mask].length :
1556 c->run_args.buffer_size;
1561 if (EXPECT_FALSE (dst_left == 0))
1569 ring->desc[b0->desc_index & mask].flags |=
1570 MEMIF_DESC_FLAG_NEXT;
1571 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1573 b0 = (bufs + *count_out);
1574 b0->desc_index = mq->next_buf;
1575 dst_left = (c->args.is_master) ?
1576 ring->desc[mq->next_buf & mask].length :
1577 c->run_args.buffer_size;
1578 ring->desc[mq->next_buf & mask].flags = 0;
1582 /* rollback allocated chain buffers */
1583 memset (saved_b, 0, sizeof (memif_buffer_t)
1584 * (saved_count - count + 1));
1585 *count_out -= saved_count - count;
1586 mq->next_buf = saved_next_buf;
1590 b0->len = memif_min (dst_left, src_left);
1592 /* slave resets buffer offset */
1593 if (c->args.is_master == 0)
1595 memif_desc_t *d = &ring->desc[slot & mask];
1596 if (ms->get_external_buffer_offset)
1597 d->offset = ms->get_external_buffer_offset (c->private_ctx);
1599 d->offset = d->offset - (d->offset & offset_mask);
1601 b0->data = memif_get_buffer (c, ring, mq->next_buf & mask);
1603 src_left -= b0->len;
1604 dst_left -= b0->len;
1615 DBG ("allocated: %u/%u bufs. Next buffer pointer %d", *count_out, count,
1620 DBG ("ring buffer full! qid: %u", qid);
1621 err = MEMIF_ERR_NOBUF_RING;
1628 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1631 memif_connection_t *c = (memif_connection_t *) conn;
1632 if (EXPECT_FALSE (c == NULL))
1633 return MEMIF_ERR_NOCONN;
1634 if (EXPECT_FALSE (c->control_channel == NULL))
1635 return MEMIF_ERR_DISCONNECTED;
1637 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1638 run_args.num_m2s_rings;
1639 if (EXPECT_FALSE (qid >= num))
1640 return MEMIF_ERR_QID;
1641 memif_socket_t *ms = (memif_socket_t *) c->args.socket;
1642 memif_queue_t *mq = &c->rx_queues[qid];
1643 memif_ring_t *ring = mq->ring;
1644 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1645 uint32_t offset_mask = c->run_args.buffer_size - 1;
1646 uint16_t slot, counter = 0;
1648 if (c->args.is_master)
1650 MEMIF_MEMORY_BARRIER ();
1652 (ring->tail + count <=
1653 mq->last_head) ? ring->tail + count : mq->last_head;
1654 return MEMIF_ERR_SUCCESS;
1657 uint16_t head = ring->head;
1659 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1660 count = (count < ns) ? count : ns;
1663 while (counter < count)
1665 d = &ring->desc[slot & mask];
1667 d->length = c->run_args.buffer_size - headroom;
1668 if (ms->get_external_buffer_offset)
1669 d->offset = ms->get_external_buffer_offset (c->private_ctx);
1671 d->offset = d->offset - (d->offset & offset_mask) + headroom;
1676 MEMIF_MEMORY_BARRIER ();
1679 return MEMIF_ERR_SUCCESS; /* 0 */
1683 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1684 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1686 memif_connection_t *c = (memif_connection_t *) conn;
1687 if (EXPECT_FALSE (c == NULL))
1688 return MEMIF_ERR_NOCONN;
1689 if (EXPECT_FALSE (c->control_channel == NULL))
1690 return MEMIF_ERR_DISCONNECTED;
1692 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1693 run_args.num_s2m_rings;
1694 if (EXPECT_FALSE (qid >= num))
1695 return MEMIF_ERR_QID;
1696 if (EXPECT_FALSE (!tx))
1697 return MEMIF_ERR_INVAL_ARG;
1699 memif_queue_t *mq = &c->tx_queues[qid];
1700 memif_ring_t *ring = mq->ring;
1701 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1702 uint32_t offset_mask = c->run_args.buffer_size - 1;
1705 int64_t data_offset;
1707 int err = MEMIF_ERR_SUCCESS;
1709 if (EXPECT_FALSE (count == 0))
1710 return MEMIF_ERR_SUCCESS;
1713 if (c->args.is_master)
1721 /* set error to MEMIF_ERR_INVAL_ARG and finish the sending process
1723 if ((b0->desc_index & mask) != (index & mask))
1725 err = MEMIF_ERR_INVAL_ARG;
1728 d = &ring->desc[b0->desc_index & mask];
1729 d->length = b0->len;
1730 if (!c->args.is_master)
1733 d->offset = d->offset - (d->offset & offset_mask);
1734 // calculate offset from user data
1735 data_offset = b0->data - (d->offset + c->regions[d->region].addr);
1736 if (data_offset != 0)
1738 /* verify data offset and buffer length */
1739 if ((data_offset < 0) ||
1740 ((data_offset + b0->len) > c->run_args.buffer_size))
1742 DBG ("slot: %d, data_offset: %d, length: %d",
1743 b0->desc_index & mask, data_offset, b0->len);
1744 err = MEMIF_ERR_INVAL_ARG;
1747 d->offset += data_offset;
1751 #ifdef MEMIF_DBG_SHM
1752 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1753 printf ("data: %p\n",
1754 memif_get_buffer (c, ring, b0->desc_index & mask));
1755 printf ("index: %u\n", b0->desc_index);
1756 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1757 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1758 #endif /* MEMIF_DBG_SHM */
1766 MEMIF_MEMORY_BARRIER ();
1767 if (c->args.is_master)
1768 ring->tail = b0->desc_index + 1;
1770 ring->head = b0->desc_index + 1;
1772 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1775 int r = write (mq->int_fd, &a, sizeof (a));
1777 return MEMIF_ERR_INT_WRITE;
1784 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1785 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1787 memif_connection_t *c = (memif_connection_t *) conn;
1788 if (EXPECT_FALSE (c == NULL))
1789 return MEMIF_ERR_NOCONN;
1790 if (EXPECT_FALSE (c->control_channel == NULL))
1791 return MEMIF_ERR_DISCONNECTED;
1793 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1794 run_args.num_m2s_rings;
1795 if (EXPECT_FALSE (qid >= num))
1796 return MEMIF_ERR_QID;
1797 if (EXPECT_FALSE (!rx))
1798 return MEMIF_ERR_INVAL_ARG;
1800 memif_queue_t *mq = &c->rx_queues[qid];
1801 memif_ring_t *ring = mq->ring;
1802 uint16_t cur_slot, last_slot;
1804 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1811 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1812 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1813 if (cur_slot == last_slot)
1815 r = read (mq->int_fd, &b, sizeof (b));
1816 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1817 return memif_syscall_error_handler (errno);
1819 return MEMIF_ERR_SUCCESS;
1822 ns = last_slot - cur_slot;
1828 b0->desc_index = cur_slot;
1829 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1830 b0->len = ring->desc[cur_slot & mask].length;
1831 /* slave resets buffer length */
1832 if (c->args.is_master == 0)
1834 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1837 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1839 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1840 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1844 #ifdef MEMIF_DBG_SHM
1845 printf ("data: %p\n", b0->data);
1846 printf ("index: %u\n", b0->desc_index);
1847 printf ("queue: %p\n", b0->queue);
1848 print_bytes (b0->data, b0->len, DBG_RX_BUF);
1849 #endif /* MEMIF_DBG_SHM */
1857 if (c->args.is_master)
1858 mq->last_head = cur_slot;
1860 mq->last_tail = cur_slot;
1864 DBG ("not enough buffers!");
1865 return MEMIF_ERR_NOBUF;
1868 r = read (mq->int_fd, &b, sizeof (b));
1869 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1870 return memif_syscall_error_handler (errno);
1872 return MEMIF_ERR_SUCCESS; /* 0 */
1876 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1877 char *buf, ssize_t buflen)
1879 memif_connection_t *c = (memif_connection_t *) conn;
1881 int err = MEMIF_ERR_SUCCESS, i;
1885 return MEMIF_ERR_NOCONN;
1887 ms = (memif_socket_t *) c->args.socket;
1889 l1 = strlen ((char *) c->args.interface_name);
1890 if (l0 + l1 < buflen)
1893 (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
1897 err = MEMIF_ERR_NOBUF_DET;
1899 l1 = strlen ((char *) ms->args.app_name);
1900 if (l0 + l1 < buflen)
1903 (uint8_t *) strcpy (buf + l0, (char *) ms->args.app_name);
1907 err = MEMIF_ERR_NOBUF_DET;
1909 l1 = strlen ((char *) c->remote_if_name);
1910 if (l0 + l1 < buflen)
1912 md->remote_if_name =
1913 (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
1917 err = MEMIF_ERR_NOBUF_DET;
1919 l1 = strlen ((char *) c->remote_name);
1920 if (l0 + l1 < buflen)
1922 md->remote_inst_name =
1923 (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
1927 err = MEMIF_ERR_NOBUF_DET;
1929 md->id = c->args.interface_id;
1931 if (strlen ((char *) c->args.secret) > 0)
1933 l1 = strlen ((char *) c->args.secret);
1934 if (l0 + l1 < buflen)
1936 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
1940 err = MEMIF_ERR_NOBUF_DET;
1943 md->role = (c->args.is_master) ? 0 : 1;
1944 md->mode = c->args.mode;
1947 if (l0 + l1 < buflen)
1949 md->socket_path = (uint8_t *) memcpy (buf + l0, ms->args.path, 108);
1950 if (md->socket_path[0] == '\0')
1952 md->socket_path[0] = '@';
1957 err = MEMIF_ERR_NOBUF_DET;
1959 l1 = strlen ((char *) c->remote_disconnect_string);
1960 if (l0 + l1 < buflen)
1963 (uint8_t *) strcpy (buf + l0, (char *) c->remote_disconnect_string);
1967 err = MEMIF_ERR_NOBUF_DET;
1969 md->regions_num = c->regions_num;
1970 l1 = sizeof (memif_region_details_t) * md->regions_num;
1971 if (l0 + l1 <= buflen)
1973 md->regions = (memif_region_details_t *) (buf + l0);
1974 for (i = 0; i < md->regions_num; i++)
1976 md->regions[i].index = i;
1977 md->regions[i].addr = c->regions[i].addr;
1978 md->regions[i].size = c->regions[i].region_size;
1979 md->regions[i].fd = c->regions[i].fd;
1980 md->regions[i].is_external = c->regions[i].is_external;
1985 err = MEMIF_ERR_NOBUF_DET;
1988 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1989 run_args.num_m2s_rings;
1991 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
1992 if (l0 + l1 <= buflen)
1994 md->rx_queues = (memif_queue_details_t *) (buf + l0);
1995 for (i = 0; i < md->rx_queues_num; i++)
1997 md->rx_queues[i].region = c->rx_queues[i].region;
1998 md->rx_queues[i].qid = i;
1999 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2000 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2001 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2002 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2003 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2008 err = MEMIF_ERR_NOBUF_DET;
2011 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
2012 run_args.num_s2m_rings;
2014 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2015 if (l0 + l1 <= buflen)
2017 md->tx_queues = (memif_queue_details_t *) (buf + l0);
2018 for (i = 0; i < md->tx_queues_num; i++)
2020 md->tx_queues[i].region = c->tx_queues[i].region;
2021 md->tx_queues[i].qid = i;
2022 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2023 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2024 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2025 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2026 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2031 err = MEMIF_ERR_NOBUF_DET;
2033 /* This is not completely true, clients should relay on
2034 * on_connect/on_disconnect callbacks */
2035 md->link_up_down = (c->control_channel != NULL) ? 1 : 0;
2041 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2043 memif_connection_t *c = (memif_connection_t *) conn;
2048 return MEMIF_ERR_NOCONN;
2049 if (c->control_channel == NULL)
2050 return MEMIF_ERR_DISCONNECTED;
2053 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2054 run_args.num_m2s_rings;
2056 return MEMIF_ERR_QID;
2058 *efd = c->rx_queues[qid].int_fd;
2060 return MEMIF_ERR_SUCCESS;