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 39
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 libmemif_main_t libmemif_main;
70 int poll_cancel_fd = -1;
72 static char memif_buf[MAX_ERRBUF_LEN];
74 const char *memif_errlist[ERRLIST_LEN] = { /* MEMIF_ERR_SUCCESS */
76 /* MEMIF_ERR_SYSCALL */
77 "Unspecified syscall error (build with -DMEMIF_DBG or make debug).",
79 "Permission to resoure denied.",
80 /* MEMIF_ERR_NO_FILE */
81 "Socket file does not exist",
82 /* MEMIF_ERR_FILE_LIMIT */
83 "System limit on total numer of open files reached.",
84 /* MEMIF_ERR_PROC_FILE_LIMIT */
85 "Per-process limit on total number of open files reached.",
86 /* MEMIF_ERR_ALREADY */
87 "Connection already requested.",
89 "File descriptor refers to file other than socket, or operation would block.",
90 /* MEMIF_ERR_BAD_FD */
91 "Bad file descriptor.",
94 /* MEMIF_ERR_INVAL_ARG */
96 /* MEMIF_ERR_NOCONN */
97 "Memif connection handle does not point to existing conenction",
99 "Memif connection handle points to existing connection",
100 /* MEMIF_ERR_CB_FDUPDATE */
101 "Callback memif_control_fd_update_t returned error",
102 /* MEMIF_ERR_FILE_NOT_SOCK */
103 "File specified by socket filename exists and is not socket.",
104 /* MEMIF_ERR_NO_SHMFD */
105 "Missing shared memory file descriptor. (internal error)",
106 /* MEMIF_ERR_COOKIE */
107 "Invalid cookie on ring. (internal error)",
108 /* MEMIF_ERR_NOBUF_RING */
110 /* MEMIF_ERR_NOBUF */
111 "Not enough memif buffers. There are unreceived data in shared memory.",
112 /* MEMIF_ERR_NOBUF_DET */
113 "Not enough space for memif details in suplied buffer. String data might be malformed.",
114 /* MEMIF_ERR_INT_WRITE */
115 "Send interrupt error.",
116 /* MEMIF_ERR_MFMSG */
117 "Malformed message received on control channel.",
120 /* MEMIF_ERR_PROTO */
121 "Incompatible memory interface protocol version.",
123 "Unmatched interface id.",
124 /* MEMIF_ERR_ACCSLAVE */
125 "Slave cannot accept connection reqest.",
126 /* MEMIF_ERR_ALRCONN */
127 "Interface is already connected.",
130 /* MEMIF_ERR_SECRET */
132 /* MEMIF_ERR_NOSECRET */
134 /* MEMIF_ERR_MAXREG */
135 "Limit on total number of regions reached.",
136 /* MEMIF_ERR_MAXRING */
137 "Limit on total number of ring reached.",
138 /* MEMIF_ERR_NO_INTFD */
139 "Missing interrupt file descriptor. (internal error)",
140 /* MEMIF_ERR_DISCONNECT */
141 "Interface received disconnect request.",
142 /* MEMIF_ERR_DISCONNECTED */
143 "Interface is disconnected.",
144 /* MEMIF_ERR_UNKNOWN_MSG */
145 "Unknown message type received on control channel. (internal error)",
146 /* MEMIF_ERR_POLL_CANCEL */
147 "Memif event polling was canceled.",
148 /* MEMIF_ERR_MAX_RING */
149 "Maximum log2 ring size is 15",
150 /* MEMIF_ERR_PRIVHDR */
151 "Private headers not supported."
154 #define MEMIF_ERR_UNDEFINED "undefined error"
157 memif_strerror (int err_code)
159 if (err_code >= ERRLIST_LEN)
161 strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED));
162 memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0';
166 strncpy (memif_buf, memif_errlist[err_code],
167 strlen (memif_errlist[err_code]));
168 memif_buf[strlen (memif_errlist[err_code])] = '\0';
176 return MEMIF_VERSION;
179 #define DBG_TX_BUF (0)
180 #define DBG_RX_BUF (1)
184 print_bytes (void *data, uint16_t len, uint8_t q)
187 printf ("\nTX:\n\t");
189 printf ("\nRX:\n\t");
191 for (i = 0; i < len; i++)
194 printf ("\n%d:\t", i);
195 printf ("%02X ", ((uint8_t *) (data))[i]);
199 #endif /* MEMIF_DBG_SHM */
202 memif_syscall_error_handler (int err_code)
204 DBG ("%s", strerror (err_code));
207 return MEMIF_ERR_SUCCESS;
208 if (err_code == EACCES)
209 return MEMIF_ERR_ACCES;
210 if (err_code == ENFILE)
211 return MEMIF_ERR_FILE_LIMIT;
212 if (err_code == EMFILE)
213 return MEMIF_ERR_PROC_FILE_LIMIT;
214 if (err_code == ENOMEM)
215 return MEMIF_ERR_NOMEM;
216 /* connection refused if master does not exist
217 this error would spam the user until master was created */
218 if (err_code == ECONNREFUSED)
219 return MEMIF_ERR_SUCCESS;
220 if (err_code == EALREADY)
221 return MEMIF_ERR_ALREADY;
222 if (err_code == EAGAIN)
223 return MEMIF_ERR_AGAIN;
224 if (err_code == EBADF)
225 return MEMIF_ERR_BAD_FD;
226 if (err_code == ENOENT)
227 return MEMIF_ERR_NO_FILE;
229 /* other syscall errors */
230 return MEMIF_ERR_SYSCALL;
234 memif_add_epoll_fd (int fd, uint32_t events)
238 DBG ("invalid fd %d", fd);
241 struct epoll_event evt;
242 memset (&evt, 0, sizeof (evt));
245 if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
247 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
250 DBG ("fd %d added to epoll", fd);
255 memif_mod_epoll_fd (int fd, uint32_t events)
259 DBG ("invalid fd %d", fd);
262 struct epoll_event evt;
263 memset (&evt, 0, sizeof (evt));
266 if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
268 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
271 DBG ("fd %d moddified on epoll", fd);
276 memif_del_epoll_fd (int fd)
280 DBG ("invalid fd %d", fd);
283 struct epoll_event evt;
284 memset (&evt, 0, sizeof (evt));
285 if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
287 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
290 DBG ("fd %d removed from epoll", fd);
295 memif_control_fd_update (int fd, uint8_t events)
297 if (events & MEMIF_FD_EVENT_DEL)
298 return memif_del_epoll_fd (fd);
301 if (events & MEMIF_FD_EVENT_READ)
303 if (events & MEMIF_FD_EVENT_WRITE)
306 if (events & MEMIF_FD_EVENT_MOD)
307 return memif_mod_epoll_fd (fd, evt);
309 return memif_add_epoll_fd (fd, evt);
313 add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
315 libmemif_main_t *lm = &libmemif_main;
318 for (i = 0; i < *len; i++)
320 if ((*list)[i].data_struct == NULL)
322 (*list)[i].key = e->key;
323 (*list)[i].data_struct = e->data_struct;
327 memif_list_elt_t *tmp;
328 tmp = realloc (*list, sizeof (memif_list_elt_t) * *len * 2);
332 for (i = *len; i < *len * 2; i++)
335 tmp[i].data_struct = NULL;
338 tmp[*len].key = e->key;
339 tmp[*len].data_struct = e->data_struct;
348 get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len,
357 for (i = 0; i < len; i++)
359 if (list[i].key == key)
369 /* does not free memory, only marks element as free */
371 free_list_elt (memif_list_elt_t * list, uint16_t len, int key)
374 for (i = 0; i < len; i++)
376 if (list[i].key == key)
379 list[i].data_struct = NULL;
388 free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
389 memif_connection_t * ctx)
392 for (i = 0; i < len; i++)
394 if (list[i].key == -1)
396 if (list[i].data_struct == ctx)
398 list[i].data_struct = NULL;
408 memif_control_fd_update_register (memif_control_fd_update_t * cb)
410 libmemif_main_t *lm = &libmemif_main;
411 lm->control_fd_update = cb;
415 memif_alloc_register (memif_alloc_t * ma)
417 libmemif_main_t *lm = &libmemif_main;
422 memif_free_register (memif_free_t * mf)
424 libmemif_main_t *lm = &libmemif_main;
429 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
430 memif_alloc_t * memif_alloc, memif_free_t * memif_free)
432 int err = MEMIF_ERR_SUCCESS; /* 0 */
433 libmemif_main_t *lm = &libmemif_main;
434 memset (lm, 0, sizeof (libmemif_main_t));
436 if (memif_alloc != NULL)
438 memif_alloc_register (memif_alloc);
441 memif_alloc_register (malloc);
443 if (memif_free != NULL)
444 memif_free_register (memif_free);
446 memif_free_register (free);
448 if (app_name != NULL)
450 uint8_t len = (strlen (app_name) > MEMIF_NAME_LEN)
451 ? strlen (app_name) : MEMIF_NAME_LEN;
452 strncpy ((char *) lm->app_name, app_name, len);
456 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
457 strlen (MEMIF_DEFAULT_APP_NAME));
460 /* register control fd update callback */
461 if (on_control_fd_update != NULL)
462 memif_control_fd_update_register (on_control_fd_update);
465 memif_epfd = epoll_create (1);
466 memif_control_fd_update_register (memif_control_fd_update);
467 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
470 DBG ("eventfd: %s", strerror (err));
471 return memif_syscall_error_handler (err);
473 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ);
474 DBG ("libmemif event polling initialized");
477 lm->control_list_len = 2;
478 lm->interrupt_list_len = 2;
479 lm->listener_list_len = 1;
480 lm->pending_list_len = 1;
483 lm->alloc (sizeof (memif_list_elt_t) * lm->control_list_len);
484 if (lm->control_list == NULL)
486 err = MEMIF_ERR_NOMEM;
490 lm->alloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
491 if (lm->interrupt_list == NULL)
493 err = MEMIF_ERR_NOMEM;
497 lm->alloc (sizeof (memif_list_elt_t) * lm->listener_list_len);
498 if (lm->listener_list == NULL)
500 err = MEMIF_ERR_NOMEM;
504 lm->alloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
505 if (lm->pending_list == NULL)
507 err = MEMIF_ERR_NOMEM;
512 for (i = 0; i < lm->control_list_len; i++)
514 lm->control_list[i].key = -1;
515 lm->control_list[i].data_struct = NULL;
517 for (i = 0; i < lm->interrupt_list_len; i++)
519 lm->interrupt_list[i].key = -1;
520 lm->interrupt_list[i].data_struct = NULL;
522 for (i = 0; i < lm->listener_list_len; i++)
524 lm->listener_list[i].key = -1;
525 lm->listener_list[i].data_struct = NULL;
527 for (i = 0; i < lm->pending_list_len; i++)
529 lm->pending_list[i].key = -1;
530 lm->pending_list[i].data_struct = NULL;
533 lm->disconn_slaves = 0;
535 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
538 err = memif_syscall_error_handler (errno);
542 lm->arm.it_value.tv_sec = 2;
543 lm->arm.it_value.tv_nsec = 0;
544 lm->arm.it_interval.tv_sec = 2;
545 lm->arm.it_interval.tv_nsec = 0;
547 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
549 DBG ("callback type memif_control_fd_update_t error!");
550 err = MEMIF_ERR_CB_FDUPDATE;
561 static inline memif_ring_t *
562 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
565 if (&conn->regions[0] == NULL)
567 void *p = conn->regions[0].shm;
569 sizeof (memif_ring_t) +
570 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
571 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
573 return (memif_ring_t *) p;
577 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
580 memif_connection_t *conn = (memif_connection_t *) c;
582 return MEMIF_ERR_NOCONN;
584 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->run_args.
587 return MEMIF_ERR_QID;
589 conn->rx_queues[qid].ring->flags = rx_mode;
590 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
591 return MEMIF_ERR_SUCCESS;
595 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
596 memif_connection_update_t * on_connect,
597 memif_connection_update_t * on_disconnect,
598 memif_interrupt_t * on_interrupt, void *private_ctx)
600 libmemif_main_t *lm = &libmemif_main;
601 int err, i, index, sockfd = -1;
602 memif_list_elt_t list_elt;
603 memif_connection_t *conn = (memif_connection_t *) * c;
606 DBG ("This handle already points to existing memif.");
607 return MEMIF_ERR_CONN;
609 conn = (memif_connection_t *) lm->alloc (sizeof (memif_connection_t));
612 err = MEMIF_ERR_NOMEM;
615 memset (conn, 0, sizeof (memif_connection_t));
617 conn->args.interface_id = args->interface_id;
619 if (args->log2_ring_size == 0)
620 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
621 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
623 err = MEMIF_ERR_MAX_RING;
626 if (args->buffer_size == 0)
627 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
628 if (args->num_s2m_rings == 0)
629 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
630 if (args->num_m2s_rings == 0)
631 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
633 conn->args.num_s2m_rings = args->num_s2m_rings;
634 conn->args.num_m2s_rings = args->num_m2s_rings;
635 conn->args.buffer_size = args->buffer_size;
636 conn->args.log2_ring_size = args->log2_ring_size;
637 conn->args.is_master = args->is_master;
638 conn->args.mode = args->mode;
639 conn->msg_queue = NULL;
640 conn->regions = NULL;
641 conn->tx_queues = NULL;
642 conn->rx_queues = NULL;
644 conn->on_connect = on_connect;
645 conn->on_disconnect = on_disconnect;
646 conn->on_interrupt = on_interrupt;
647 conn->private_ctx = private_ctx;
648 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
650 uint8_t l = strlen ((char *) args->interface_name);
651 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
654 /* allocate and initialize socket_filename so it can be copyed to sun_path
655 without memory leaks */
656 conn->args.socket_filename = lm->alloc (sizeof (char *) * 108);
657 if (conn->args.socket_filename == NULL)
659 err = MEMIF_ERR_NOMEM;
662 memset (conn->args.socket_filename, 0, 108 * sizeof (char *));
664 if (args->socket_filename)
666 if (conn->args.socket_filename == NULL)
668 err = memif_syscall_error_handler (errno);
671 strncpy ((char *) conn->args.socket_filename,
672 (char *) args->socket_filename,
673 strlen ((char *) args->socket_filename));
677 uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR);
678 uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME);
679 if (conn->args.socket_filename == NULL)
681 err = memif_syscall_error_handler (errno);
684 strncpy ((char *) conn->args.socket_filename,
685 MEMIF_DEFAULT_SOCKET_DIR, sdl);
686 conn->args.socket_filename[sdl] = '/';
687 strncpy ((char *) (conn->args.socket_filename + 1 + sdl),
688 MEMIF_DEFAULT_SOCKET_FILENAME, sfl);
691 if ((l = strlen ((char *) args->secret)) > 0)
693 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
696 if (conn->args.is_master)
698 conn->run_args.buffer_size = conn->args.buffer_size;
700 memif_list_elt_t elt;
701 for (i = 0; i < lm->listener_list_len; i++)
704 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
707 ((char *) ms->filename, (char *) conn->args.socket_filename,
708 strlen ((char *) ms->filename)) == 0)
710 /* add interface to listener socket */
711 elt.key = conn->args.interface_id;
712 *c = elt.data_struct = conn;
713 add_list_elt (&elt, &ms->interface_list,
714 &ms->interface_list_len);
716 conn->listener_fd = ms->fd;
722 struct stat file_stat;
723 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
725 if (S_ISSOCK (file_stat.st_mode))
726 unlink ((char *) conn->args.socket_filename);
728 return memif_syscall_error_handler (errno);
730 DBG ("creating socket file");
731 ms = lm->alloc (sizeof (memif_socket_t));
734 err = MEMIF_ERR_NOMEM;
738 lm->alloc (strlen ((char *) conn->args.socket_filename) +
740 if (ms->filename == NULL)
742 err = MEMIF_ERR_NOMEM;
745 memset (ms->filename, 0,
746 strlen ((char *) conn->args.socket_filename) +
748 strncpy ((char *) ms->filename,
749 (char *) conn->args.socket_filename,
750 strlen ((char *) conn->args.socket_filename));
751 ms->interface_list_len = 1;
753 lm->alloc (sizeof (memif_list_elt_t) *
754 ms->interface_list_len);
755 if (ms->interface_list == NULL)
757 err = MEMIF_ERR_NOMEM;
760 ms->interface_list[0].key = -1;
761 ms->interface_list[0].data_struct = NULL;
762 struct sockaddr_un un = { 0 };
765 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
768 err = memif_syscall_error_handler (errno);
771 DBG ("socket %d created", ms->fd);
772 un.sun_family = AF_UNIX;
773 strncpy ((char *) un.sun_path, (char *) ms->filename,
774 sizeof (un.sun_path) - 1);
777 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
779 err = memif_syscall_error_handler (errno);
783 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
785 err = memif_syscall_error_handler (errno);
789 if (listen (ms->fd, 1) < 0)
791 err = memif_syscall_error_handler (errno);
795 if (stat ((char *) ms->filename, &file_stat) < 0)
797 err = memif_syscall_error_handler (errno);
801 /* add interface to listener socket */
802 elt.key = conn->args.interface_id;
803 *c = elt.data_struct = conn;
804 add_list_elt (&elt, &ms->interface_list,
805 &ms->interface_list_len);
807 conn->listener_fd = ms->fd;
809 /* add listener socket to libmemif main */
811 elt.data_struct = ms;
812 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
813 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
820 if (lm->disconn_slaves == 0)
822 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
824 err = memif_syscall_error_handler (errno);
829 lm->disconn_slaves++;
832 *c = list_elt.data_struct = conn;
834 add_list_elt (&list_elt, &lm->control_list,
835 &lm->control_list_len)) < 0)
837 err = MEMIF_ERR_NOMEM;
850 if (conn->args.socket_filename)
851 lm->free (conn->args.socket_filename);
859 memif_control_fd_handler (int fd, uint8_t events)
861 int i, rv, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */
863 memif_list_elt_t *e = NULL;
864 memif_connection_t *conn;
865 libmemif_main_t *lm = &libmemif_main;
866 if (fd == lm->timerfd)
870 size = read (fd, &b, sizeof (b));
871 for (i = 0; i < lm->control_list_len; i++)
873 if ((lm->control_list[i].key < 0)
874 && (lm->control_list[i].data_struct != NULL))
876 conn = lm->control_list[i].data_struct;
877 if (conn->args.is_master)
880 struct sockaddr_un sun;
881 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
884 err = memif_syscall_error_handler (errno);
888 sun.sun_family = AF_UNIX;
890 strncpy (sun.sun_path, (char*) conn->args.socket_filename,
891 sizeof (sun.sun_path) - 1);
893 if (connect (sockfd, (struct sockaddr *) &sun,
894 sizeof (struct sockaddr_un)) == 0)
897 conn->read_fn = memif_conn_fd_read_ready;
898 conn->write_fn = memif_conn_fd_write_ready;
899 conn->error_fn = memif_conn_fd_error;
901 lm->control_list[conn->index].key = conn->fd;
903 lm->control_fd_update (sockfd,
904 MEMIF_FD_EVENT_READ |
905 MEMIF_FD_EVENT_WRITE);
907 lm->disconn_slaves--;
908 if (lm->disconn_slaves == 0)
910 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL)
913 err = memif_syscall_error_handler (errno);
920 err = memif_syscall_error_handler (errno);
928 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
931 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
934 (((memif_connection_t *) e->data_struct)->args.
935 is_master) ? ((memif_connection_t *) e->data_struct)->
936 run_args.num_s2m_rings : ((memif_connection_t *) e->
937 data_struct)->run_args.
939 for (i = 0; i < num; i++)
941 if (((memif_connection_t *) e->data_struct)->rx_queues[i].
944 ((memif_connection_t *) e->
945 data_struct)->on_interrupt ((void *) e->data_struct,
946 ((memif_connection_t *)
949 return MEMIF_ERR_SUCCESS;
953 return MEMIF_ERR_SUCCESS;
955 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
958 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
959 return MEMIF_ERR_SUCCESS;
962 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
965 memif_read_ready (fd);
966 return MEMIF_ERR_SUCCESS;
969 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
972 if (events & MEMIF_FD_EVENT_READ)
975 ((memif_connection_t *) e->data_struct)->read_fn (e->
977 if (err != MEMIF_ERR_SUCCESS)
980 if (events & MEMIF_FD_EVENT_WRITE)
983 ((memif_connection_t *) e->data_struct)->write_fn (e->
985 if (err != MEMIF_ERR_SUCCESS)
988 if (events & MEMIF_FD_EVENT_ERROR)
991 ((memif_connection_t *) e->data_struct)->error_fn (e->
993 if (err != MEMIF_ERR_SUCCESS)
999 return MEMIF_ERR_SUCCESS; /* 0 */
1009 memif_poll_event (int timeout)
1011 libmemif_main_t *lm = &libmemif_main;
1012 memif_list_elt_t *elt;
1013 struct epoll_event evt, *e;
1014 int en = 0, err = MEMIF_ERR_SUCCESS, i = 0; /* 0 */
1016 uint32_t events = 0;
1017 uint64_t counter = 0;
1019 memset (&evt, 0, sizeof (evt));
1020 evt.events = EPOLLIN | EPOLLOUT;
1022 sigemptyset (&sigset);
1023 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
1027 DBG ("epoll_pwait: %s", strerror (err));
1028 return memif_syscall_error_handler (err);
1032 if (evt.data.fd == poll_cancel_fd)
1034 r = read (evt.data.fd, &counter, sizeof (counter));
1035 return MEMIF_ERR_POLL_CANCEL;
1037 if (evt.events & EPOLLIN)
1038 events |= MEMIF_FD_EVENT_READ;
1039 if (evt.events & EPOLLOUT)
1040 events |= MEMIF_FD_EVENT_WRITE;
1041 if (evt.events & EPOLLERR)
1042 events |= MEMIF_FD_EVENT_ERROR;
1043 err = memif_control_fd_handler (evt.data.fd, events);
1050 memif_cancel_poll_event ()
1052 uint64_t counter = 1;
1055 if (poll_cancel_fd == -1)
1057 w = write (poll_cancel_fd, &counter, sizeof (counter));
1058 if (w < sizeof (counter))
1059 return MEMIF_ERR_INT_WRITE;
1065 memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
1069 memif_msg_queue_free (lm, &(*e)->next);
1075 /* send disconnect msg and close interface */
1077 memif_disconnect_internal (memif_connection_t * c)
1081 DBG ("no connection");
1082 return MEMIF_ERR_NOCONN;
1085 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1087 libmemif_main_t *lm = &libmemif_main;
1088 memif_list_elt_t *e;
1090 c->on_disconnect ((void *) c, c->private_ctx);
1094 memif_msg_send_disconnect (c->fd, (uint8_t *) "interface deleted", 0);
1095 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1098 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1101 if (c->args.is_master)
1102 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1103 e->key = c->fd = -1;
1106 if (c->tx_queues != NULL)
1109 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1111 for (i = 0; i < num; i++)
1113 mq = &c->tx_queues[i];
1118 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1123 lm->free (c->tx_queues);
1124 c->tx_queues = NULL;
1127 if (c->rx_queues != NULL)
1130 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1132 for (i = 0; i < num; i++)
1134 mq = &c->rx_queues[i];
1139 if (c->on_interrupt != NULL)
1140 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1143 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1148 lm->free (c->rx_queues);
1149 c->rx_queues = NULL;
1152 if (c->regions != NULL)
1154 if (munmap (c->regions[0].shm, c->regions[0].region_size) < 0)
1155 return memif_syscall_error_handler (errno);
1156 if (c->regions[0].fd > 0)
1157 close (c->regions[0].fd);
1158 c->regions[0].fd = -1;
1159 lm->free (c->regions);
1163 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1165 memif_msg_queue_free (lm, &c->msg_queue);
1167 if (!(c->args.is_master))
1169 if (lm->disconn_slaves == 0)
1171 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1173 err = memif_syscall_error_handler (errno);
1174 DBG ("timerfd_settime: arm");
1177 lm->disconn_slaves++;
1184 memif_delete (memif_conn_handle_t * conn)
1186 memif_connection_t *c = (memif_connection_t *) * conn;
1189 DBG ("no connection");
1190 return MEMIF_ERR_NOCONN;
1192 libmemif_main_t *lm = &libmemif_main;
1193 memif_list_elt_t *e = NULL;
1194 memif_socket_t *ms = NULL;
1196 int err = MEMIF_ERR_SUCCESS;
1200 DBG ("DISCONNECTING");
1201 err = memif_disconnect_internal (c);
1202 if (err == MEMIF_ERR_NOCONN)
1206 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1208 if (c->args.is_master)
1210 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1214 ms = (memif_socket_t *) e->data_struct;
1216 free_list_elt (ms->interface_list, ms->interface_list_len,
1217 c->args.interface_id);
1218 if (ms->use_count <= 0)
1220 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1221 free_list_elt (lm->listener_list, lm->listener_list_len,
1223 close (c->listener_fd);
1224 c->listener_fd = ms->fd = -1;
1225 lm->free (ms->interface_list);
1226 ms->interface_list = NULL;
1227 lm->free (ms->filename);
1228 ms->filename = NULL;
1236 lm->disconn_slaves--;
1237 if (lm->disconn_slaves <= 0)
1239 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1241 err = memif_syscall_error_handler (errno);
1242 DBG ("timerfd_settime: disarm");
1247 if (c->args.socket_filename)
1248 lm->free (c->args.socket_filename);
1249 c->args.socket_filename = NULL;
1259 memif_connect1 (memif_connection_t * c)
1261 libmemif_main_t *lm = &libmemif_main;
1262 memif_region_t *mr = c->regions;
1272 return MEMIF_ERR_NO_SHMFD;
1274 if ((mr->shm = mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1275 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1277 return memif_syscall_error_handler (errno);
1283 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1285 for (i = 0; i < num; i++)
1287 mq = &c->tx_queues[i];
1290 mq->ring = c->regions[mq->region].shm + mq->offset;
1291 if (mq->ring->cookie != MEMIF_COOKIE)
1293 DBG ("wrong cookie on tx ring %u", i);
1294 return MEMIF_ERR_COOKIE;
1296 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1301 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1303 for (i = 0; i < num; i++)
1305 mq = &c->rx_queues[i];
1308 mq->ring = c->regions[mq->region].shm + mq->offset;
1309 if (mq->ring->cookie != MEMIF_COOKIE)
1311 DBG ("wrong cookie on rx ring %u", i);
1312 return MEMIF_ERR_COOKIE;
1314 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1319 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1325 memif_init_regions_and_queues (memif_connection_t * conn)
1327 memif_ring_t *ring = NULL;
1330 libmemif_main_t *lm = &libmemif_main;
1333 conn->regions = (memif_region_t *) lm->alloc (sizeof (memif_region_t));
1334 if (conn->regions == NULL)
1335 return MEMIF_ERR_NOMEM;
1339 (conn->run_args.num_s2m_rings +
1340 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1341 sizeof (memif_desc_t) *
1342 (1 << conn->run_args.log2_ring_size));
1344 r->region_size = r->buffer_offset +
1345 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1346 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1349 memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1350 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1351 return memif_syscall_error_handler (errno);
1353 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1354 return memif_syscall_error_handler (errno);
1356 if ((ftruncate (r->fd, r->region_size)) == -1)
1357 return memif_syscall_error_handler (errno);
1359 if ((r->shm = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1360 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1361 return memif_syscall_error_handler (errno);
1363 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1365 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1366 DBG ("RING: %p I: %d", ring, i);
1367 ring->head = ring->tail = 0;
1368 ring->cookie = MEMIF_COOKIE;
1370 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1372 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1373 ring->desc[j].region = 0;
1374 ring->desc[j].offset = r->buffer_offset +
1375 (uint32_t) (slot * conn->run_args.buffer_size);
1376 ring->desc[j].length = conn->run_args.buffer_size;
1379 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1381 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1382 DBG ("RING: %p I: %d", ring, i);
1383 ring->head = ring->tail = 0;
1384 ring->cookie = MEMIF_COOKIE;
1386 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1390 conn->run_args.num_s2m_rings) *
1391 (1 << conn->run_args.log2_ring_size) + j;
1392 ring->desc[j].region = 0;
1393 ring->desc[j].offset = r->buffer_offset +
1394 (uint32_t) (slot * conn->run_args.buffer_size);
1395 ring->desc[j].length = conn->run_args.buffer_size;
1400 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1401 conn->run_args.num_s2m_rings);
1403 return MEMIF_ERR_NOMEM;
1405 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1407 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1408 return memif_syscall_error_handler (errno);
1409 /* add int fd to interrupt fd list */
1410 e.key = mq[x].int_fd;
1411 e.data_struct = conn;
1412 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1414 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1415 DBG ("RING: %p I: %d", mq[x].ring, x);
1416 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1419 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1420 mq[x].last_head = 0;
1421 mq[x].alloc_bufs = 0;
1423 conn->tx_queues = mq;
1426 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1427 conn->run_args.num_m2s_rings);
1429 return MEMIF_ERR_NOMEM;
1430 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1432 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1433 return memif_syscall_error_handler (errno);
1434 /* add int fd to interrupt fd list */
1435 e.key = mq[x].int_fd;
1436 e.data_struct = conn;
1437 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1439 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1440 DBG ("RING: %p I: %d", mq[x].ring, x);
1441 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1444 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1445 mq[x].last_head = 0;
1446 mq[x].alloc_bufs = 0;
1448 conn->rx_queues = mq;
1454 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1455 memif_buffer_t * bufs, uint16_t count,
1456 uint16_t * count_out)
1458 memif_connection_t *c = (memif_connection_t *) conn;
1459 if (EXPECT_FALSE (c == NULL))
1460 return MEMIF_ERR_NOCONN;
1461 if (EXPECT_FALSE (c->fd < 0))
1462 return MEMIF_ERR_DISCONNECTED;
1464 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1466 if (EXPECT_FALSE (qid >= num))
1467 return MEMIF_ERR_QID;
1468 if (EXPECT_FALSE (!count_out))
1469 return MEMIF_ERR_INVAL_ARG;
1470 if (EXPECT_FALSE (c->args.is_master))
1471 return MEMIF_ERR_INVAL_ARG;
1473 memif_queue_t *mq = &c->tx_queues[qid];
1474 memif_ring_t *ring = mq->ring;
1476 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1479 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1482 ring_size = (1 << mq->log2_ring_size);
1483 ns = ring->tail - mq->last_tail;
1484 mq->last_tail += ns;
1485 slot = (c->args.is_master) ? ring->tail : ring->head;
1486 slot += mq->alloc_bufs;
1488 /* can only be called by slave */
1489 ns = ring_size - ring->head + mq->alloc_bufs + mq->last_tail;
1495 if (EXPECT_FALSE ((b0->flags & MEMIF_BUFFER_FLAG_RX) == 0))
1497 /* not a valid buffer */
1501 b0->flags &= ~MEMIF_BUFFER_FLAG_RX;
1503 ((memif_ring_t *) b0->ring)->desc[b0->desc_index & mask].offset = ring->desc[slot & mask].offset; /* put free buffer on rx ring */
1505 ring->desc[slot & mask].offset =
1506 (uint32_t) (b0->data - c->regions->shm);
1507 ring->desc[slot & mask].flags |=
1508 (b0->flags & MEMIF_BUFFER_FLAG_NEXT) ? MEMIF_DESC_FLAG_NEXT : 0;
1510 b0->desc_index = slot;
1521 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1526 DBG ("ring buffer full! qid: %u", qid);
1527 err = MEMIF_ERR_NOBUF_RING;
1535 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1536 memif_buffer_t * bufs, uint16_t count,
1537 uint16_t * count_out, uint16_t size)
1539 memif_connection_t *c = (memif_connection_t *) conn;
1540 if (EXPECT_FALSE (c == NULL))
1541 return MEMIF_ERR_NOCONN;
1542 if (EXPECT_FALSE (c->fd < 0))
1543 return MEMIF_ERR_DISCONNECTED;
1545 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1547 if (EXPECT_FALSE (qid >= num))
1548 return MEMIF_ERR_QID;
1549 if (EXPECT_FALSE (!count_out))
1550 return MEMIF_ERR_INVAL_ARG;
1552 memif_queue_t *mq = &c->tx_queues[qid];
1553 memif_ring_t *ring = mq->ring;
1554 memif_buffer_t *b0, *b1;
1555 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1558 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1559 uint16_t dst_left, src_left;
1560 uint16_t saved_count;
1561 memif_buffer_t *saved_b;
1564 ring_size = (1 << mq->log2_ring_size);
1565 ns = ring->tail - mq->last_tail;
1566 mq->last_tail += ns;
1567 slot = (c->args.is_master) ? ring->tail : ring->head;
1568 slot += mq->alloc_bufs;
1570 if (c->args.is_master)
1571 ns = ring->head + mq->alloc_bufs - ring->tail;
1573 ns = ring_size - ring->head + mq->alloc_bufs + mq->last_tail;
1577 b0 = (bufs + *count_out);
1580 saved_count = count;
1582 b0->desc_index = slot;
1583 ring->desc[slot & mask].flags = 0;
1585 /* slave can produce buffer with original length */
1586 dst_left = (c->args.is_master) ? ring->desc[slot & mask].length :
1587 c->run_args.buffer_size;
1592 if (EXPECT_FALSE (dst_left == 0))
1602 ring->desc[b0->desc_index & mask].flags |=
1603 MEMIF_DESC_FLAG_NEXT;
1604 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1606 b0 = (bufs + *count_out);
1607 b0->desc_index = slot;
1609 (c->args.is_master) ? ring->desc[slot & mask].length : c->
1610 run_args.buffer_size;
1611 ring->desc[slot & mask].flags = 0;
1615 /* rollback allocated chain buffers */
1616 memset (saved_b, 0, sizeof (memif_buffer_t)
1617 * (saved_count - count + 1));
1618 *count_out -= saved_count - count;
1619 mq->alloc_bufs = saved_count - count;
1623 b0->len = memif_min (dst_left, src_left);
1625 /* slave resets buffer offset */
1626 if (c->args.is_master == 0)
1629 (ring->desc[slot & mask].offset -
1630 c->regions->buffer_offset) / c->run_args.buffer_size;
1631 ring->desc[slot & mask].offset =
1632 c->regions->buffer_offset + (x * c->run_args.buffer_size);
1635 b0->data = c->regions->shm + ring->desc[slot & mask].offset;
1637 src_left -= b0->len;
1638 dst_left -= b0->len;
1650 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1655 DBG ("ring buffer full! qid: %u", qid);
1656 err = MEMIF_ERR_NOBUF_RING;
1664 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1667 memif_connection_t *c = (memif_connection_t *) conn;
1668 if (EXPECT_FALSE (c == NULL))
1669 return MEMIF_ERR_NOCONN;
1670 if (EXPECT_FALSE (c->fd < 0))
1671 return MEMIF_ERR_DISCONNECTED;
1673 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1675 if (EXPECT_FALSE (qid >= num))
1676 return MEMIF_ERR_QID;
1677 libmemif_main_t *lm = &libmemif_main;
1678 memif_queue_t *mq = &c->rx_queues[qid];
1679 memif_ring_t *ring = mq->ring;
1680 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1683 if (c->args.is_master)
1685 MEMIF_MEMORY_BARRIER ();
1687 (ring->tail + count <=
1688 mq->last_head) ? ring->tail + count : mq->last_head;
1689 return MEMIF_ERR_SUCCESS;
1692 uint16_t head = ring->head;
1693 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1694 head += (count < ns) ? count : ns;
1698 slot = (c->args.is_master) ? ring->head : ring->tail;
1702 (ring->desc[slot & mask].offset -
1703 c->regions->buffer_offset) / c->run_args.buffer_size;
1704 ring->desc[slot & mask].offset =
1705 c->regions->buffer_offset + (x * c->run_args.buffer_size) +
1712 MEMIF_MEMORY_BARRIER ();
1715 return MEMIF_ERR_SUCCESS; /* 0 */
1719 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1720 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1722 memif_connection_t *c = (memif_connection_t *) conn;
1723 if (EXPECT_FALSE (c == NULL))
1724 return MEMIF_ERR_NOCONN;
1725 if (EXPECT_FALSE (c->fd < 0))
1726 return MEMIF_ERR_DISCONNECTED;
1728 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1730 if (EXPECT_FALSE (qid >= num))
1731 return MEMIF_ERR_QID;
1732 if (EXPECT_FALSE (!tx))
1733 return MEMIF_ERR_INVAL_ARG;
1735 memif_queue_t *mq = &c->tx_queues[qid];
1736 memif_ring_t *ring = mq->ring;
1737 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1741 if (count > mq->alloc_bufs)
1742 count = mq->alloc_bufs;
1744 if (EXPECT_FALSE (count == 0))
1745 return MEMIF_ERR_SUCCESS;
1750 ring->desc[b0->desc_index & mask].length = b0->len;
1752 #ifdef MEMIF_DBG_SHM
1753 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1754 printf ("data: %p\n",
1755 memif_get_buffer (c, ring, b0->desc_index & mask));
1756 printf ("index: %u\n", b0->desc_index);
1757 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1758 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1759 #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 mq->alloc_bufs -= *tx;
1774 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1777 int r = write (mq->int_fd, &a, sizeof (a));
1779 return MEMIF_ERR_INT_WRITE;
1782 return MEMIF_ERR_SUCCESS; /* 0 */
1786 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1787 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1789 memif_connection_t *c = (memif_connection_t *) conn;
1790 if (EXPECT_FALSE (c == NULL))
1791 return MEMIF_ERR_NOCONN;
1792 if (EXPECT_FALSE (c->fd < 0))
1793 return MEMIF_ERR_DISCONNECTED;
1795 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1797 if (EXPECT_FALSE (qid >= num))
1798 return MEMIF_ERR_QID;
1799 if (EXPECT_FALSE (!rx))
1800 return MEMIF_ERR_INVAL_ARG;
1802 memif_queue_t *mq = &c->rx_queues[qid];
1803 memif_ring_t *ring = mq->ring;
1804 uint16_t cur_slot, last_slot;
1806 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1807 memif_buffer_t *b0, *b1;
1811 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1812 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1813 return memif_syscall_error_handler (errno);
1815 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1816 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1817 if (cur_slot == last_slot)
1818 return MEMIF_ERR_SUCCESS;
1820 ns = last_slot - cur_slot;
1826 b0->desc_index = cur_slot;
1827 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1828 b0->len = ring->desc[cur_slot & mask].length;
1829 /* slave resets buffer length */
1830 if (c->args.is_master == 0)
1832 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1835 b0->flags = MEMIF_BUFFER_FLAG_RX;
1836 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1838 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1839 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1841 /* b0->offset = ring->desc[cur_slot & mask].offset;*/
1843 #ifdef MEMIF_DBG_SHM
1844 printf ("data: %p\n", b0->data);
1845 printf ("index: %u\n", b0->desc_index);
1846 printf ("ring: %p\n", b0->ring);
1847 print_bytes (b0->data, b0->len, DBG_RX_BUF);
1848 #endif /* MEMIF_DBG_SHM */
1856 if (c->args.is_master)
1857 mq->last_head = cur_slot;
1859 mq->last_tail = cur_slot;
1863 DBG ("not enough buffers!");
1864 return MEMIF_ERR_NOBUF;
1867 return MEMIF_ERR_SUCCESS; /* 0 */
1871 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1872 char *buf, ssize_t buflen)
1874 libmemif_main_t *lm = &libmemif_main;
1875 memif_connection_t *c = (memif_connection_t *) conn;
1877 return MEMIF_ERR_NOCONN;
1879 int err = MEMIF_ERR_SUCCESS, i;
1880 ssize_t l0, l1, total_l;
1883 l1 = strlen ((char *) c->args.interface_name);
1884 if (l0 + l1 < buflen)
1886 md->if_name = (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
1890 err = MEMIF_ERR_NOBUF_DET;
1892 l1 = strlen ((char *) lm->app_name);
1893 if (l0 + l1 < buflen)
1895 md->inst_name = (uint8_t *) strcpy (buf + l0, (char *) lm->app_name);
1899 err = MEMIF_ERR_NOBUF_DET;
1901 l1 = strlen ((char *) c->remote_if_name);
1902 if (l0 + l1 < buflen)
1904 md->remote_if_name = (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
1908 err = MEMIF_ERR_NOBUF_DET;
1910 l1 = strlen ((char *) c->remote_name);
1911 if (l0 + l1 < buflen)
1913 md->remote_inst_name = (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
1917 err = MEMIF_ERR_NOBUF_DET;
1919 md->id = c->args.interface_id;
1921 if (strlen((char *) c->args.secret) > 0)
1923 l1 = strlen ((char *) c->args.secret);
1924 if (l0 + l1 < buflen)
1926 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
1930 err = MEMIF_ERR_NOBUF_DET;
1933 md->role = (c->args.is_master) ? 0 : 1;
1934 md->mode = c->args.mode;
1936 l1 = strlen ((char *) c->args.socket_filename);
1937 if (l0 + l1 < buflen)
1939 md->socket_filename =
1940 (uint8_t *) strcpy (buf + l0, (char *) c->args.socket_filename);
1944 err = MEMIF_ERR_NOBUF_DET;
1947 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1950 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
1951 if (l0 + l1 <= buflen)
1953 md->rx_queues = (memif_queue_details_t *) buf + l0;
1957 err = MEMIF_ERR_NOBUF_DET;
1959 for (i = 0; i < md->rx_queues_num; i++)
1961 md->rx_queues[i].qid = i;
1962 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
1963 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
1964 md->rx_queues[i].head = c->rx_queues[i].ring->head;
1965 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
1966 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
1970 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1973 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
1974 if (l0 + l1 <= buflen)
1976 md->tx_queues = (memif_queue_details_t *) buf + l0;
1980 err = MEMIF_ERR_NOBUF_DET;
1982 for (i = 0; i < md->tx_queues_num; i++)
1984 md->tx_queues[i].qid = i;
1985 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
1986 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
1987 md->tx_queues[i].head = c->tx_queues[i].ring->head;
1988 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
1989 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
1992 md->link_up_down = (c->fd > 0) ? 1 : 0;
1998 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2000 memif_connection_t *c = (memif_connection_t *) conn;
2003 return MEMIF_ERR_NOCONN;
2005 return MEMIF_ERR_DISCONNECTED;
2007 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
2010 return MEMIF_ERR_QID;
2012 *efd = c->rx_queues[qid].int_fd;
2014 return MEMIF_ERR_SUCCESS;
2020 libmemif_main_t *lm = &libmemif_main;
2021 if (lm->control_list)
2022 lm->free (lm->control_list);
2023 lm->control_list = NULL;
2024 if (lm->interrupt_list)
2025 lm->free (lm->interrupt_list);
2026 lm->interrupt_list = NULL;
2027 if (lm->listener_list)
2028 lm->free (lm->listener_list);
2029 lm->listener_list = NULL;
2030 if (lm->pending_list)
2031 lm->free (lm->pending_list);
2032 lm->pending_list = NULL;
2033 if (poll_cancel_fd != -1)
2034 close (poll_cancel_fd);
2036 return MEMIF_ERR_SUCCESS; /* 0 */