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 *------------------------------------------------------------------
20 #include <sys/types.h>
22 #include <sys/ioctl.h>
23 #include <sys/socket.h>
27 #include <sys/prctl.h>
33 #include <linux/icmp.h>
34 #include <arpa/inet.h>
36 #include <netinet/if_ether.h>
37 #include <net/if_arp.h>
38 #include <asm/byteorder.h>
43 #include <sys/eventfd.h>
44 #include <sys/timerfd.h>
45 #include <sys/epoll.h>
48 /* memif protocol msg, ring and descriptor definitions */
52 /* socket messaging functions */
54 /* private structs and functions */
55 #include <memif_private.h>
57 #define ERRLIST_LEN 39
58 #define MAX_ERRBUF_LEN 256
61 #define MEMIF_MEMORY_BARRIER() __builtin_ia32_sfence ()
63 #define MEMIF_MEMORY_BARRIER() __sync_synchronize ()
64 #endif /* __x86_x64__ */
66 libmemif_main_t libmemif_main;
68 int poll_cancel_fd = -1;
70 static char memif_buf[MAX_ERRBUF_LEN];
72 const char *memif_errlist[ERRLIST_LEN] = { /* MEMIF_ERR_SUCCESS */
74 /* MEMIF_ERR_SYSCALL */
75 "Unspecified syscall error (build with -DMEMIF_DBG or make debug).",
77 "Permission to resoure 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 conenction",
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 suplied 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 reqest.",
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 strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED));
160 memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0';
164 strncpy (memif_buf, memif_errlist[err_code],
165 strlen (memif_errlist[err_code]));
166 memif_buf[strlen (memif_errlist[err_code])] = '\0';
174 return MEMIF_VERSION;
177 #define DBG_TX_BUF (0)
178 #define DBG_RX_BUF (1)
182 print_bytes (void *data, uint16_t len, uint8_t q)
185 printf ("\nTX:\n\t");
187 printf ("\nRX:\n\t");
189 for (i = 0; i < len; i++)
192 printf ("\n%d:\t", i);
193 printf ("%02X ", ((uint8_t *) (data))[i]);
197 #endif /* MEMIF_DBG_SHM */
200 memif_syscall_error_handler (int err_code)
202 DBG ("%s", strerror (err_code));
205 return MEMIF_ERR_SUCCESS;
206 if (err_code == EACCES)
207 return MEMIF_ERR_ACCES;
208 if (err_code == ENFILE)
209 return MEMIF_ERR_FILE_LIMIT;
210 if (err_code == EMFILE)
211 return MEMIF_ERR_PROC_FILE_LIMIT;
212 if (err_code == ENOMEM)
213 return MEMIF_ERR_NOMEM;
214 /* connection refused if master does not exist
215 this error would spam the user until master was created */
216 if (err_code == ECONNREFUSED)
217 return MEMIF_ERR_SUCCESS;
218 if (err_code == EALREADY)
219 return MEMIF_ERR_ALREADY;
220 if (err_code == EAGAIN)
221 return MEMIF_ERR_AGAIN;
222 if (err_code == EBADF)
223 return MEMIF_ERR_BAD_FD;
224 if (err_code == ENOENT)
225 return MEMIF_ERR_NO_FILE;
227 /* other syscall errors */
228 return MEMIF_ERR_SYSCALL;
232 memif_add_epoll_fd (int fd, uint32_t events)
236 DBG ("invalid fd %d", fd);
239 struct epoll_event evt;
240 memset (&evt, 0, sizeof (evt));
243 if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
245 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
248 DBG ("fd %d added to epoll", fd);
253 memif_mod_epoll_fd (int fd, uint32_t events)
257 DBG ("invalid fd %d", fd);
260 struct epoll_event evt;
261 memset (&evt, 0, sizeof (evt));
264 if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
266 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
269 DBG ("fd %d moddified on epoll", fd);
274 memif_del_epoll_fd (int fd)
278 DBG ("invalid fd %d", fd);
281 struct epoll_event evt;
282 memset (&evt, 0, sizeof (evt));
283 if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
285 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
288 DBG ("fd %d removed from epoll", fd);
293 memif_control_fd_update (int fd, uint8_t events)
295 if (events & MEMIF_FD_EVENT_DEL)
296 return memif_del_epoll_fd (fd);
299 if (events & MEMIF_FD_EVENT_READ)
301 if (events & MEMIF_FD_EVENT_WRITE)
304 if (events & MEMIF_FD_EVENT_MOD)
305 return memif_mod_epoll_fd (fd, evt);
307 return memif_add_epoll_fd (fd, evt);
311 add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
313 libmemif_main_t *lm = &libmemif_main;
316 for (i = 0; i < *len; i++)
318 if ((*list)[i].data_struct == NULL)
320 (*list)[i].key = e->key;
321 (*list)[i].data_struct = e->data_struct;
325 memif_list_elt_t *tmp;
326 tmp = realloc (*list, sizeof (memif_list_elt_t) * *len * 2);
330 for (i = *len; i < *len * 2; i++)
333 tmp[i].data_struct = NULL;
336 tmp[*len].key = e->key;
337 tmp[*len].data_struct = e->data_struct;
346 get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len,
355 for (i = 0; i < len; i++)
357 if (list[i].key == key)
367 /* does not free memory, only marks element as free */
369 free_list_elt (memif_list_elt_t * list, uint16_t len, int key)
372 for (i = 0; i < len; i++)
374 if (list[i].key == key)
377 list[i].data_struct = NULL;
386 free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
387 memif_connection_t * ctx)
390 for (i = 0; i < len; i++)
392 if (list[i].key == -1)
394 if (list[i].data_struct == ctx)
396 list[i].data_struct = NULL;
406 memif_control_fd_update_register (memif_control_fd_update_t * cb)
408 libmemif_main_t *lm = &libmemif_main;
409 lm->control_fd_update = cb;
413 memif_alloc_register (memif_alloc_t * ma)
415 libmemif_main_t *lm = &libmemif_main;
420 memif_free_register (memif_free_t * mf)
422 libmemif_main_t *lm = &libmemif_main;
427 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
428 memif_alloc_t * memif_alloc, memif_free_t * memif_free)
430 int err = MEMIF_ERR_SUCCESS; /* 0 */
431 libmemif_main_t *lm = &libmemif_main;
432 memset (lm, 0, sizeof (libmemif_main_t));
434 if (memif_alloc != NULL)
436 memif_alloc_register (memif_alloc);
439 memif_alloc_register (malloc);
441 if (memif_free != NULL)
442 memif_free_register (memif_free);
444 memif_free_register (free);
446 if (app_name != NULL)
448 uint8_t len = (strlen (app_name) > MEMIF_NAME_LEN)
449 ? strlen (app_name) : MEMIF_NAME_LEN;
450 strncpy ((char *) lm->app_name, app_name, len);
454 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
455 strlen (MEMIF_DEFAULT_APP_NAME));
458 /* register control fd update callback */
459 if (on_control_fd_update != NULL)
460 memif_control_fd_update_register (on_control_fd_update);
463 memif_epfd = epoll_create (1);
464 memif_control_fd_update_register (memif_control_fd_update);
465 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
468 DBG ("eventfd: %s", strerror (err));
469 return memif_syscall_error_handler (err);
471 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ);
472 DBG ("libmemif event polling initialized");
475 lm->control_list_len = 2;
476 lm->interrupt_list_len = 2;
477 lm->listener_list_len = 1;
478 lm->pending_list_len = 1;
481 lm->alloc (sizeof (memif_list_elt_t) * lm->control_list_len);
482 if (lm->control_list == NULL)
484 err = MEMIF_ERR_NOMEM;
488 lm->alloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
489 if (lm->interrupt_list == NULL)
491 err = MEMIF_ERR_NOMEM;
495 lm->alloc (sizeof (memif_list_elt_t) * lm->listener_list_len);
496 if (lm->listener_list == NULL)
498 err = MEMIF_ERR_NOMEM;
502 lm->alloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
503 if (lm->pending_list == NULL)
505 err = MEMIF_ERR_NOMEM;
510 for (i = 0; i < lm->control_list_len; i++)
512 lm->control_list[i].key = -1;
513 lm->control_list[i].data_struct = NULL;
515 for (i = 0; i < lm->interrupt_list_len; i++)
517 lm->interrupt_list[i].key = -1;
518 lm->interrupt_list[i].data_struct = NULL;
520 for (i = 0; i < lm->listener_list_len; i++)
522 lm->listener_list[i].key = -1;
523 lm->listener_list[i].data_struct = NULL;
525 for (i = 0; i < lm->pending_list_len; i++)
527 lm->pending_list[i].key = -1;
528 lm->pending_list[i].data_struct = NULL;
531 lm->disconn_slaves = 0;
533 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
536 err = memif_syscall_error_handler (errno);
540 lm->arm.it_value.tv_sec = 2;
541 lm->arm.it_value.tv_nsec = 0;
542 lm->arm.it_interval.tv_sec = 2;
543 lm->arm.it_interval.tv_nsec = 0;
545 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
547 DBG ("callback type memif_control_fd_update_t error!");
548 err = MEMIF_ERR_CB_FDUPDATE;
559 static inline memif_ring_t *
560 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
563 if (&conn->regions[0] == NULL)
565 void *p = conn->regions[0].shm;
567 sizeof (memif_ring_t) +
568 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
569 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
571 return (memif_ring_t *) p;
575 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
578 memif_connection_t *conn = (memif_connection_t *) c;
580 return MEMIF_ERR_NOCONN;
582 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->run_args.
585 return MEMIF_ERR_QID;
587 conn->rx_queues[qid].ring->flags = rx_mode;
588 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
589 return MEMIF_ERR_SUCCESS;
593 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
594 memif_connection_update_t * on_connect,
595 memif_connection_update_t * on_disconnect,
596 memif_interrupt_t * on_interrupt, void *private_ctx)
598 libmemif_main_t *lm = &libmemif_main;
599 int err, i, index, sockfd = -1;
600 memif_list_elt_t list_elt;
601 memif_connection_t *conn = (memif_connection_t *) * c;
604 DBG ("This handle already points to existing memif.");
605 return MEMIF_ERR_CONN;
607 conn = (memif_connection_t *) lm->alloc (sizeof (memif_connection_t));
610 err = MEMIF_ERR_NOMEM;
613 memset (conn, 0, sizeof (memif_connection_t));
615 conn->args.interface_id = args->interface_id;
617 if (args->log2_ring_size == 0)
618 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
619 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
621 err = MEMIF_ERR_MAX_RING;
624 if (args->buffer_size == 0)
625 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
626 if (args->num_s2m_rings == 0)
627 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
628 if (args->num_m2s_rings == 0)
629 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
631 conn->args.num_s2m_rings = args->num_s2m_rings;
632 conn->args.num_m2s_rings = args->num_m2s_rings;
633 conn->args.buffer_size = args->buffer_size;
634 conn->args.log2_ring_size = args->log2_ring_size;
635 conn->args.is_master = args->is_master;
636 conn->args.mode = args->mode;
637 conn->msg_queue = NULL;
638 conn->regions = NULL;
639 conn->tx_queues = NULL;
640 conn->rx_queues = NULL;
642 conn->on_connect = on_connect;
643 conn->on_disconnect = on_disconnect;
644 conn->on_interrupt = on_interrupt;
645 conn->private_ctx = private_ctx;
646 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
648 uint8_t l = strlen ((char *) args->interface_name);
649 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
652 /* allocate and initialize socket_filename so it can be copyed to sun_path
653 without memory leaks */
654 conn->args.socket_filename = lm->alloc (sizeof (char *) * 108);
655 if (conn->args.socket_filename == NULL)
657 err = MEMIF_ERR_NOMEM;
660 memset (conn->args.socket_filename, 0, 108 * sizeof (char *));
662 if (args->socket_filename)
664 if (conn->args.socket_filename == NULL)
666 err = memif_syscall_error_handler (errno);
669 strncpy ((char *) conn->args.socket_filename,
670 (char *) args->socket_filename,
671 strlen ((char *) args->socket_filename));
675 uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR);
676 uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME);
677 if (conn->args.socket_filename == NULL)
679 err = memif_syscall_error_handler (errno);
682 strncpy ((char *) conn->args.socket_filename,
683 MEMIF_DEFAULT_SOCKET_DIR, sdl);
684 conn->args.socket_filename[sdl] = '/';
685 strncpy ((char *) (conn->args.socket_filename + 1 + sdl),
686 MEMIF_DEFAULT_SOCKET_FILENAME, sfl);
691 l = strlen ((char *) args->secret);
692 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
695 if (conn->args.is_master)
697 conn->run_args.buffer_size = conn->args.buffer_size;
699 memif_list_elt_t elt;
700 for (i = 0; i < lm->listener_list_len; i++)
703 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
706 ((char *) ms->filename, (char *) conn->args.socket_filename,
707 strlen ((char *) ms->filename)) == 0)
709 /* add interface to listener socket */
710 elt.key = conn->args.interface_id;
711 *c = elt.data_struct = conn;
712 add_list_elt (&elt, &ms->interface_list,
713 &ms->interface_list_len);
715 conn->listener_fd = ms->fd;
721 struct stat file_stat;
722 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
724 if (S_ISSOCK (file_stat.st_mode))
725 unlink ((char *) conn->args.socket_filename);
727 return memif_syscall_error_handler (errno);
729 DBG ("creating socket file");
730 ms = lm->alloc (sizeof (memif_socket_t));
733 err = MEMIF_ERR_NOMEM;
737 lm->alloc (strlen ((char *) conn->args.socket_filename) +
739 if (ms->filename == NULL)
741 err = MEMIF_ERR_NOMEM;
744 memset (ms->filename, 0,
745 strlen ((char *) conn->args.socket_filename) +
747 strncpy ((char *) ms->filename,
748 (char *) conn->args.socket_filename,
749 strlen ((char *) conn->args.socket_filename));
750 ms->interface_list_len = 1;
752 lm->alloc (sizeof (memif_list_elt_t) *
753 ms->interface_list_len);
754 if (ms->interface_list == NULL)
756 err = MEMIF_ERR_NOMEM;
759 ms->interface_list[0].key = -1;
760 ms->interface_list[0].data_struct = NULL;
761 struct sockaddr_un un = { 0 };
764 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
767 err = memif_syscall_error_handler (errno);
770 DBG ("socket %d created", ms->fd);
771 un.sun_family = AF_UNIX;
772 strncpy ((char *) un.sun_path, (char *) ms->filename,
773 sizeof (un.sun_path) - 1);
776 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
778 err = memif_syscall_error_handler (errno);
782 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
784 err = memif_syscall_error_handler (errno);
788 if (listen (ms->fd, 1) < 0)
790 err = memif_syscall_error_handler (errno);
794 if (stat ((char *) ms->filename, &file_stat) < 0)
796 err = memif_syscall_error_handler (errno);
800 /* add interface to listener socket */
801 elt.key = conn->args.interface_id;
802 *c = elt.data_struct = conn;
803 add_list_elt (&elt, &ms->interface_list,
804 &ms->interface_list_len);
806 conn->listener_fd = ms->fd;
808 /* add listener socket to libmemif main */
810 elt.data_struct = ms;
811 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
812 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
819 if (lm->disconn_slaves == 0)
821 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
823 err = memif_syscall_error_handler (errno);
828 lm->disconn_slaves++;
831 *c = list_elt.data_struct = conn;
833 add_list_elt (&list_elt, &lm->control_list,
834 &lm->control_list_len)) < 0)
836 err = MEMIF_ERR_NOMEM;
849 if (conn->args.socket_filename)
850 lm->free (conn->args.socket_filename);
858 memif_control_fd_handler (int fd, uint8_t events)
860 int i, rv, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */
862 memif_list_elt_t *e = NULL;
863 memif_connection_t *conn;
864 libmemif_main_t *lm = &libmemif_main;
865 if (fd == lm->timerfd)
869 size = read (fd, &b, sizeof (b));
870 for (i = 0; i < lm->control_list_len; i++)
872 if ((lm->control_list[i].key < 0)
873 && (lm->control_list[i].data_struct != NULL))
875 conn = lm->control_list[i].data_struct;
876 if (conn->args.is_master)
879 struct sockaddr_un sun;
880 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
883 err = memif_syscall_error_handler (errno);
887 sun.sun_family = AF_UNIX;
889 strncpy (sun.sun_path, conn->args.socket_filename,
890 sizeof (sun.sun_path) - 1);
892 if (connect (sockfd, (struct sockaddr *) &sun,
893 sizeof (struct sockaddr_un)) == 0)
896 conn->read_fn = memif_conn_fd_read_ready;
897 conn->write_fn = memif_conn_fd_write_ready;
898 conn->error_fn = memif_conn_fd_error;
900 lm->control_list[conn->index].key = conn->fd;
902 lm->control_fd_update (sockfd,
903 MEMIF_FD_EVENT_READ |
904 MEMIF_FD_EVENT_WRITE);
906 lm->disconn_slaves--;
907 if (lm->disconn_slaves == 0)
909 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL)
912 err = memif_syscall_error_handler (errno);
919 err = memif_syscall_error_handler (errno);
927 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
930 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
933 (((memif_connection_t *) e->data_struct)->args.
934 is_master) ? ((memif_connection_t *) e->data_struct)->
935 run_args.num_s2m_rings : ((memif_connection_t *) e->
936 data_struct)->run_args.
938 for (i = 0; i < num; i++)
940 if (((memif_connection_t *) e->data_struct)->rx_queues[i].
943 ((memif_connection_t *) e->
944 data_struct)->on_interrupt ((void *) e->data_struct,
945 ((memif_connection_t *)
948 return MEMIF_ERR_SUCCESS;
952 return MEMIF_ERR_SUCCESS;
954 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
957 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
958 return MEMIF_ERR_SUCCESS;
961 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
964 memif_read_ready (fd);
965 return MEMIF_ERR_SUCCESS;
968 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
971 if (events & MEMIF_FD_EVENT_READ)
974 ((memif_connection_t *) e->data_struct)->read_fn (e->
976 if (err != MEMIF_ERR_SUCCESS)
979 if (events & MEMIF_FD_EVENT_WRITE)
982 ((memif_connection_t *) e->data_struct)->write_fn (e->
984 if (err != MEMIF_ERR_SUCCESS)
987 if (events & MEMIF_FD_EVENT_ERROR)
990 ((memif_connection_t *) e->data_struct)->error_fn (e->
992 if (err != MEMIF_ERR_SUCCESS)
998 return MEMIF_ERR_SUCCESS; /* 0 */
1008 memif_poll_event (int timeout)
1010 libmemif_main_t *lm = &libmemif_main;
1011 memif_list_elt_t *elt;
1012 struct epoll_event evt, *e;
1013 int en = 0, err = MEMIF_ERR_SUCCESS, i = 0; /* 0 */
1015 uint32_t events = 0;
1016 uint64_t counter = 0;
1018 memset (&evt, 0, sizeof (evt));
1019 evt.events = EPOLLIN | EPOLLOUT;
1021 sigemptyset (&sigset);
1022 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
1026 DBG ("epoll_pwait: %s", strerror (err));
1027 return memif_syscall_error_handler (err);
1031 if (evt.data.fd == poll_cancel_fd)
1033 r = read (evt.data.fd, &counter, sizeof (counter));
1034 return MEMIF_ERR_POLL_CANCEL;
1036 if (evt.events & EPOLLIN)
1037 events |= MEMIF_FD_EVENT_READ;
1038 if (evt.events & EPOLLOUT)
1039 events |= MEMIF_FD_EVENT_WRITE;
1040 if (evt.events & EPOLLERR)
1041 events |= MEMIF_FD_EVENT_ERROR;
1042 err = memif_control_fd_handler (evt.data.fd, events);
1049 memif_cancel_poll_event ()
1051 uint64_t counter = 1;
1054 if (poll_cancel_fd == -1)
1056 w = write (poll_cancel_fd, &counter, sizeof (counter));
1057 if (w < sizeof (counter))
1058 return MEMIF_ERR_INT_WRITE;
1064 memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
1068 memif_msg_queue_free (lm, &(*e)->next);
1074 /* send disconnect msg and close interface */
1076 memif_disconnect_internal (memif_connection_t * c)
1080 DBG ("no connection");
1081 return MEMIF_ERR_NOCONN;
1084 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1086 libmemif_main_t *lm = &libmemif_main;
1087 memif_list_elt_t *e;
1089 c->on_disconnect ((void *) c, c->private_ctx);
1093 memif_msg_send_disconnect (c->fd, "interface deleted", 0);
1094 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1097 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1100 if (c->args.is_master)
1101 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1102 e->key = c->fd = -1;
1105 if (c->tx_queues != NULL)
1108 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1110 for (i = 0; i < num; i++)
1112 mq = &c->tx_queues[i];
1117 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1122 lm->free (c->tx_queues);
1123 c->tx_queues = NULL;
1126 if (c->rx_queues != NULL)
1129 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1131 for (i = 0; i < num; i++)
1133 mq = &c->rx_queues[i];
1138 if (c->on_interrupt != NULL)
1139 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1142 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1147 lm->free (c->rx_queues);
1148 c->rx_queues = NULL;
1151 if (c->regions != NULL)
1153 if (munmap (c->regions[0].shm, c->regions[0].region_size) < 0)
1154 return memif_syscall_error_handler (errno);
1155 if (c->regions[0].fd > 0)
1156 close (c->regions[0].fd);
1157 c->regions[0].fd = -1;
1158 lm->free (c->regions);
1162 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1164 memif_msg_queue_free (lm, &c->msg_queue);
1166 if (!(c->args.is_master))
1168 if (lm->disconn_slaves == 0)
1170 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1172 err = memif_syscall_error_handler (errno);
1173 DBG ("timerfd_settime: arm");
1176 lm->disconn_slaves++;
1183 memif_delete (memif_conn_handle_t * conn)
1185 memif_connection_t *c = (memif_connection_t *) * conn;
1188 DBG ("no connection");
1189 return MEMIF_ERR_NOCONN;
1191 libmemif_main_t *lm = &libmemif_main;
1192 memif_list_elt_t *e = NULL;
1193 memif_socket_t *ms = NULL;
1195 int err = MEMIF_ERR_SUCCESS;
1199 DBG ("DISCONNECTING");
1200 err = memif_disconnect_internal (c);
1201 if (err == MEMIF_ERR_NOCONN)
1205 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1207 if (c->args.is_master)
1209 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1213 ms = (memif_socket_t *) e->data_struct;
1215 free_list_elt (ms->interface_list, ms->interface_list_len,
1216 c->args.interface_id);
1217 if (ms->use_count <= 0)
1219 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1220 free_list_elt (lm->listener_list, lm->listener_list_len,
1222 close (c->listener_fd);
1223 c->listener_fd = ms->fd = -1;
1224 lm->free (ms->interface_list);
1225 ms->interface_list = NULL;
1226 lm->free (ms->filename);
1227 ms->filename = NULL;
1235 lm->disconn_slaves--;
1236 if (lm->disconn_slaves <= 0)
1238 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1240 err = memif_syscall_error_handler (errno);
1241 DBG ("timerfd_settime: disarm");
1246 if (c->args.socket_filename)
1247 lm->free (c->args.socket_filename);
1248 c->args.socket_filename = NULL;
1258 memif_connect1 (memif_connection_t * c)
1260 libmemif_main_t *lm = &libmemif_main;
1261 memif_region_t *mr = c->regions;
1271 return MEMIF_ERR_NO_SHMFD;
1273 if ((mr->shm = mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1274 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1276 return memif_syscall_error_handler (errno);
1282 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1284 for (i = 0; i < num; i++)
1286 mq = &c->tx_queues[i];
1289 mq->ring = c->regions[mq->region].shm + mq->offset;
1290 if (mq->ring->cookie != MEMIF_COOKIE)
1292 DBG ("wrong cookie on tx ring %u", i);
1293 return MEMIF_ERR_COOKIE;
1295 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1300 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1302 for (i = 0; i < num; i++)
1304 mq = &c->rx_queues[i];
1307 mq->ring = c->regions[mq->region].shm + mq->offset;
1308 if (mq->ring->cookie != MEMIF_COOKIE)
1310 DBG ("wrong cookie on rx ring %u", i);
1311 return MEMIF_ERR_COOKIE;
1313 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1318 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1324 memif_init_regions_and_queues (memif_connection_t * conn)
1326 memif_ring_t *ring = NULL;
1329 libmemif_main_t *lm = &libmemif_main;
1332 conn->regions = (memif_region_t *) lm->alloc (sizeof (memif_region_t));
1333 if (conn->regions == NULL)
1334 return MEMIF_ERR_NOMEM;
1338 (conn->run_args.num_s2m_rings +
1339 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1340 sizeof (memif_desc_t) *
1341 (1 << conn->run_args.log2_ring_size));
1343 r->region_size = r->buffer_offset +
1344 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1345 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1348 memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1349 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1350 return memif_syscall_error_handler (errno);
1352 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1353 return memif_syscall_error_handler (errno);
1355 if ((ftruncate (r->fd, r->region_size)) == -1)
1356 return memif_syscall_error_handler (errno);
1358 if ((r->shm = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1359 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1360 return memif_syscall_error_handler (errno);
1362 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1364 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1365 DBG ("RING: %p I: %d", ring, i);
1366 ring->head = ring->tail = 0;
1367 ring->cookie = MEMIF_COOKIE;
1369 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1371 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1372 ring->desc[j].region = 0;
1373 ring->desc[j].offset = r->buffer_offset +
1374 (uint32_t) (slot * conn->run_args.buffer_size);
1375 ring->desc[j].length = conn->run_args.buffer_size;
1378 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1380 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1381 DBG ("RING: %p I: %d", ring, i);
1382 ring->head = ring->tail = 0;
1383 ring->cookie = MEMIF_COOKIE;
1385 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1389 conn->run_args.num_s2m_rings) *
1390 (1 << conn->run_args.log2_ring_size) + j;
1391 ring->desc[j].region = 0;
1392 ring->desc[j].offset = r->buffer_offset +
1393 (uint32_t) (slot * conn->run_args.buffer_size);
1394 ring->desc[j].length = conn->run_args.buffer_size;
1399 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1400 conn->run_args.num_s2m_rings);
1402 return MEMIF_ERR_NOMEM;
1404 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1406 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1407 return memif_syscall_error_handler (errno);
1408 /* add int fd to interrupt fd list */
1409 e.key = mq[x].int_fd;
1410 e.data_struct = conn;
1411 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1413 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1414 DBG ("RING: %p I: %d", mq[x].ring, x);
1415 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1418 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1419 mq[x].last_head = 0;
1420 mq[x].alloc_bufs = 0;
1422 conn->tx_queues = mq;
1425 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1426 conn->run_args.num_m2s_rings);
1428 return MEMIF_ERR_NOMEM;
1429 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1431 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1432 return memif_syscall_error_handler (errno);
1433 /* add int fd to interrupt fd list */
1434 e.key = mq[x].int_fd;
1435 e.data_struct = conn;
1436 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1438 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1439 DBG ("RING: %p I: %d", mq[x].ring, x);
1440 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1443 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1444 mq[x].last_head = 0;
1445 mq[x].alloc_bufs = 0;
1447 conn->rx_queues = mq;
1453 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1454 memif_buffer_t * bufs, uint16_t count,
1455 uint16_t * count_out)
1457 memif_connection_t *c = (memif_connection_t *) conn;
1458 if (EXPECT_FALSE (c == NULL))
1459 return MEMIF_ERR_NOCONN;
1460 if (EXPECT_FALSE (c->fd < 0))
1461 return MEMIF_ERR_DISCONNECTED;
1463 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1465 if (EXPECT_FALSE (qid >= num))
1466 return MEMIF_ERR_QID;
1467 if (EXPECT_FALSE (!count_out))
1468 return MEMIF_ERR_INVAL_ARG;
1469 if (EXPECT_FALSE (c->args.is_master))
1470 return MEMIF_ERR_INVAL_ARG;
1472 memif_queue_t *mq = &c->tx_queues[qid];
1473 memif_ring_t *ring = mq->ring;
1475 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1478 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1481 ring_size = (1 << mq->log2_ring_size);
1482 ns = ring->tail - mq->last_tail;
1483 mq->last_tail += ns;
1484 slot = (c->args.is_master) ? ring->tail : ring->head;
1485 slot += mq->alloc_bufs;
1487 /* can only be called by slave */
1488 ns = ring_size - ring->head + mq->alloc_bufs + mq->last_tail;
1494 if (EXPECT_FALSE ((b0->flags & MEMIF_BUFFER_FLAG_RX) == 0))
1496 /* not a valid buffer */
1500 b0->flags &= ~MEMIF_BUFFER_FLAG_RX;
1502 ((memif_ring_t *) b0->ring)->desc[b0->desc_index & mask].offset = ring->desc[slot & mask].offset; /* put free buffer on rx ring */
1504 ring->desc[slot & mask].offset =
1505 (uint32_t) (b0->data - c->regions->shm);
1506 ring->desc[slot & mask].flags |=
1507 (b0->flags & MEMIF_BUFFER_FLAG_NEXT) ? MEMIF_DESC_FLAG_NEXT : 0;
1509 b0->desc_index = slot;
1520 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1525 DBG ("ring buffer full! qid: %u", qid);
1526 err = MEMIF_ERR_NOBUF_RING;
1534 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1535 memif_buffer_t * bufs, uint16_t count,
1536 uint16_t * count_out, uint16_t size)
1538 memif_connection_t *c = (memif_connection_t *) conn;
1539 if (EXPECT_FALSE (c == NULL))
1540 return MEMIF_ERR_NOCONN;
1541 if (EXPECT_FALSE (c->fd < 0))
1542 return MEMIF_ERR_DISCONNECTED;
1544 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1546 if (EXPECT_FALSE (qid >= num))
1547 return MEMIF_ERR_QID;
1548 if (EXPECT_FALSE (!count_out))
1549 return MEMIF_ERR_INVAL_ARG;
1551 memif_queue_t *mq = &c->tx_queues[qid];
1552 memif_ring_t *ring = mq->ring;
1553 memif_buffer_t *b0, *b1;
1554 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1557 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1558 uint16_t dst_left, src_left;
1559 uint16_t saved_count;
1560 memif_buffer_t *saved_b;
1563 ring_size = (1 << mq->log2_ring_size);
1564 ns = ring->tail - mq->last_tail;
1565 mq->last_tail += ns;
1566 slot = (c->args.is_master) ? ring->tail : ring->head;
1567 slot += mq->alloc_bufs;
1569 if (c->args.is_master)
1570 ns = ring->head + mq->alloc_bufs - ring->tail;
1572 ns = ring_size - ring->head + mq->alloc_bufs + mq->last_tail;
1576 b0 = (bufs + *count_out);
1579 saved_count = count;
1581 b0->desc_index = slot;
1582 ring->desc[slot & mask].flags = 0;
1584 /* slave can produce buffer with original length */
1585 dst_left = (c->args.is_master) ? ring->desc[slot & mask].length :
1586 c->run_args.buffer_size;
1591 if (EXPECT_FALSE (dst_left == 0))
1601 ring->desc[b0->desc_index & mask].flags |=
1602 MEMIF_DESC_FLAG_NEXT;
1603 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1605 b0 = (bufs + *count_out);
1606 b0->desc_index = slot;
1608 (c->args.is_master) ? ring->desc[slot & mask].length : c->
1609 run_args.buffer_size;
1610 ring->desc[slot & mask].flags = 0;
1614 /* rollback allocated chain buffers */
1615 memset (saved_b, 0, sizeof (memif_buffer_t)
1616 * (saved_count - count + 1));
1617 *count_out -= saved_count - count;
1618 mq->alloc_bufs = saved_count - count;
1622 b0->len = memif_min (dst_left, src_left);
1624 /* slave resets buffer offset */
1625 if (c->args.is_master == 0)
1628 (ring->desc[slot & mask].offset -
1629 c->regions->buffer_offset) / c->run_args.buffer_size;
1630 ring->desc[slot & mask].offset =
1631 c->regions->buffer_offset + (x * c->run_args.buffer_size);
1634 b0->data = c->regions->shm + ring->desc[slot & mask].offset;
1636 src_left -= b0->len;
1637 dst_left -= b0->len;
1649 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1654 DBG ("ring buffer full! qid: %u", qid);
1655 err = MEMIF_ERR_NOBUF_RING;
1663 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1666 memif_connection_t *c = (memif_connection_t *) conn;
1667 if (EXPECT_FALSE (c == NULL))
1668 return MEMIF_ERR_NOCONN;
1669 if (EXPECT_FALSE (c->fd < 0))
1670 return MEMIF_ERR_DISCONNECTED;
1672 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1674 if (EXPECT_FALSE (qid >= num))
1675 return MEMIF_ERR_QID;
1676 libmemif_main_t *lm = &libmemif_main;
1677 memif_queue_t *mq = &c->rx_queues[qid];
1678 memif_ring_t *ring = mq->ring;
1679 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1682 if (c->args.is_master)
1684 MEMIF_MEMORY_BARRIER ();
1686 (ring->tail + count <=
1687 mq->last_head) ? ring->tail + count : mq->last_head;
1688 return MEMIF_ERR_SUCCESS;
1691 uint16_t head = ring->head;
1692 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1693 head += (count < ns) ? count : ns;
1697 slot = (c->args.is_master) ? ring->head : ring->tail;
1701 (ring->desc[slot & mask].offset -
1702 c->regions->buffer_offset) / c->run_args.buffer_size;
1703 ring->desc[slot & mask].offset =
1704 c->regions->buffer_offset + (x * c->run_args.buffer_size) +
1711 MEMIF_MEMORY_BARRIER ();
1714 return MEMIF_ERR_SUCCESS; /* 0 */
1718 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1719 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1721 memif_connection_t *c = (memif_connection_t *) conn;
1722 if (EXPECT_FALSE (c == NULL))
1723 return MEMIF_ERR_NOCONN;
1724 if (EXPECT_FALSE (c->fd < 0))
1725 return MEMIF_ERR_DISCONNECTED;
1727 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1729 if (EXPECT_FALSE (qid >= num))
1730 return MEMIF_ERR_QID;
1731 if (EXPECT_FALSE (!tx))
1732 return MEMIF_ERR_INVAL_ARG;
1734 memif_queue_t *mq = &c->tx_queues[qid];
1735 memif_ring_t *ring = mq->ring;
1736 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1740 if (count > mq->alloc_bufs)
1741 count = mq->alloc_bufs;
1743 if (EXPECT_FALSE (count == 0))
1744 return MEMIF_ERR_SUCCESS;
1749 ring->desc[b0->desc_index & mask].length = b0->len;
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 */
1765 MEMIF_MEMORY_BARRIER ();
1766 if (c->args.is_master)
1767 ring->tail = b0->desc_index + 1;
1769 ring->head = b0->desc_index + 1;
1771 mq->alloc_bufs -= *tx;
1773 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1776 int r = write (mq->int_fd, &a, sizeof (a));
1778 return MEMIF_ERR_INT_WRITE;
1781 return MEMIF_ERR_SUCCESS; /* 0 */
1785 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1786 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1788 memif_connection_t *c = (memif_connection_t *) conn;
1789 if (EXPECT_FALSE (c == NULL))
1790 return MEMIF_ERR_NOCONN;
1791 if (EXPECT_FALSE (c->fd < 0))
1792 return MEMIF_ERR_DISCONNECTED;
1794 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1796 if (EXPECT_FALSE (qid >= num))
1797 return MEMIF_ERR_QID;
1798 if (EXPECT_FALSE (!rx))
1799 return MEMIF_ERR_INVAL_ARG;
1801 memif_queue_t *mq = &c->rx_queues[qid];
1802 memif_ring_t *ring = mq->ring;
1803 uint16_t cur_slot, last_slot;
1805 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1806 memif_buffer_t *b0, *b1;
1810 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1811 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1812 return memif_syscall_error_handler (errno);
1814 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1815 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1816 if (cur_slot == last_slot)
1817 return MEMIF_ERR_SUCCESS;
1819 ns = last_slot - cur_slot;
1825 b0->desc_index = cur_slot;
1826 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1827 b0->len = ring->desc[cur_slot & mask].length;
1828 /* slave resets buffer length */
1829 if (c->args.is_master == 0)
1831 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1834 b0->flags = MEMIF_BUFFER_FLAG_RX;
1835 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1837 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1838 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1840 /* b0->offset = ring->desc[cur_slot & mask].offset;*/
1842 #ifdef MEMIF_DBG_SHM
1843 printf ("data: %p\n", b0->data);
1844 printf ("index: %u\n", b0->desc_index);
1845 printf ("ring: %p\n", b0->ring);
1846 print_bytes (b0->data, b0->len, DBG_RX_BUF);
1847 #endif /* MEMIF_DBG_SHM */
1855 if (c->args.is_master)
1856 mq->last_head = cur_slot;
1858 mq->last_tail = cur_slot;
1862 DBG ("not enough buffers!");
1863 return MEMIF_ERR_NOBUF;
1866 return MEMIF_ERR_SUCCESS; /* 0 */
1870 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1871 char *buf, ssize_t buflen)
1873 libmemif_main_t *lm = &libmemif_main;
1874 memif_connection_t *c = (memif_connection_t *) conn;
1876 return MEMIF_ERR_NOCONN;
1878 int err = MEMIF_ERR_SUCCESS, i;
1879 ssize_t l0, l1, total_l;
1882 l1 = strlen ((char *) c->args.interface_name);
1883 if (l0 + l1 < buflen)
1885 md->if_name = strcpy (buf + l0, (char *) c->args.interface_name);
1889 err = MEMIF_ERR_NOBUF_DET;
1891 l1 = strlen ((char *) lm->app_name);
1892 if (l0 + l1 < buflen)
1894 md->inst_name = strcpy (buf + l0, (char *) lm->app_name);
1898 err = MEMIF_ERR_NOBUF_DET;
1900 l1 = strlen ((char *) c->remote_if_name);
1901 if (l0 + l1 < buflen)
1903 md->remote_if_name = strcpy (buf + l0, (char *) c->remote_if_name);
1907 err = MEMIF_ERR_NOBUF_DET;
1909 l1 = strlen ((char *) c->remote_name);
1910 if (l0 + l1 < buflen)
1912 md->remote_inst_name = strcpy (buf + l0, (char *) c->remote_name);
1916 err = MEMIF_ERR_NOBUF_DET;
1918 md->id = c->args.interface_id;
1922 l1 = strlen ((char *) c->args.secret);
1923 if (l0 + l1 < buflen)
1925 md->secret = strcpy (buf + l0, (char *) c->args.secret);
1929 err = MEMIF_ERR_NOBUF_DET;
1932 md->role = (c->args.is_master) ? 0 : 1;
1933 md->mode = c->args.mode;
1935 l1 = strlen ((char *) c->args.socket_filename);
1936 if (l0 + l1 < buflen)
1938 md->socket_filename =
1939 strcpy (buf + l0, (char *) c->args.socket_filename);
1943 err = MEMIF_ERR_NOBUF_DET;
1946 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1949 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
1950 if (l0 + l1 <= buflen)
1952 md->rx_queues = (memif_queue_details_t *) buf + l0;
1956 err = MEMIF_ERR_NOBUF_DET;
1958 for (i = 0; i < md->rx_queues_num; i++)
1960 md->rx_queues[i].qid = i;
1961 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
1962 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
1963 md->rx_queues[i].head = c->rx_queues[i].ring->head;
1964 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
1965 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
1969 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1972 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
1973 if (l0 + l1 <= buflen)
1975 md->tx_queues = (memif_queue_details_t *) buf + l0;
1979 err = MEMIF_ERR_NOBUF_DET;
1981 for (i = 0; i < md->tx_queues_num; i++)
1983 md->tx_queues[i].qid = i;
1984 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
1985 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
1986 md->tx_queues[i].head = c->tx_queues[i].ring->head;
1987 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
1988 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
1991 md->link_up_down = (c->fd > 0) ? 1 : 0;
1997 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
1999 memif_connection_t *c = (memif_connection_t *) conn;
2002 return MEMIF_ERR_NOCONN;
2004 return MEMIF_ERR_DISCONNECTED;
2006 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
2009 return MEMIF_ERR_QID;
2011 *efd = c->rx_queues[qid].int_fd;
2013 return MEMIF_ERR_SUCCESS;
2019 libmemif_main_t *lm = &libmemif_main;
2020 if (lm->control_list)
2021 lm->free (lm->control_list);
2022 lm->control_list = NULL;
2023 if (lm->interrupt_list)
2024 lm->free (lm->interrupt_list);
2025 lm->interrupt_list = NULL;
2026 if (lm->listener_list)
2027 lm->free (lm->listener_list);
2028 lm->listener_list = NULL;
2029 if (lm->pending_list)
2030 lm->free (lm->pending_list);
2031 lm->pending_list = NULL;
2032 if (poll_cancel_fd != -1)
2033 close (poll_cancel_fd);
2035 return MEMIF_ERR_SUCCESS; /* 0 */