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 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).",
78 /* MEMIF_ERR_CONNREFUSED */
81 "Permission to resoure denied.",
82 /* MEMIF_ERR_NO_FILE */
83 "Socket file does not exist",
84 /* MEMIF_ERR_FILE_LIMIT */
85 "System limit on total numer of open files reached.",
86 /* MEMIF_ERR_PROC_FILE_LIMIT */
87 "Per-process limit on total number of open files reached.",
88 /* MEMIF_ERR_ALREADY */
89 "Connection already requested.",
91 "File descriptor refers to file other than socket, or operation would block.",
92 /* MEMIF_ERR_BAD_FD */
93 "Bad file descriptor.",
96 /* MEMIF_ERR_INVAL_ARG */
98 /* MEMIF_ERR_NOCONN */
99 "Memif connection handle does not point to existing conenction",
101 "Memif connection handle points to existing connection",
102 /* MEMIF_ERR_CB_FDUPDATE */
103 "Callback memif_control_fd_update_t returned error",
104 /* MEMIF_ERR_FILE_NOT_SOCK */
105 "File specified by socket filename exists and is not socket.",
106 /* MEMIF_ERR_NO_SHMFD */
107 "Missing shared memory file descriptor. (internal error)",
108 /* MEMIF_ERR_COOKIE */
109 "Invalid cookie on ring. (internal error)",
110 /* MEMIF_ERR_NOBUF_RING */
112 /* MEMIF_ERR_NOBUF */
113 "Not enough memif buffers. There are unreceived data in shared memory.",
114 /* MEMIF_ERR_NOBUF_DET */
115 "Not enough space for memif details in suplied buffer. String data might be malformed.",
116 /* MEMIF_ERR_INT_WRITE */
117 "Send interrupt error.",
118 /* MEMIF_ERR_MFMSG */
119 "Malformed message received on control channel.",
122 /* MEMIF_ERR_PROTO */
123 "Incompatible memory interface protocol version.",
125 "Unmatched interface id.",
126 /* MEMIF_ERR_ACCSLAVE */
127 "Slave cannot accept connection reqest.",
128 /* MEMIF_ERR_ALRCONN */
129 "Interface is already connected.",
132 /* MEMIF_ERR_SECRET */
134 /* MEMIF_ERR_NOSECRET */
136 /* MEMIF_ERR_MAXREG */
137 "Limit on total number of regions reached.",
138 /* MEMIF_ERR_MAXRING */
139 "Limit on total number of ring reached.",
140 /* MEMIF_ERR_NO_INTFD */
141 "Missing interrupt file descriptor. (internal error)",
142 /* MEMIF_ERR_DISCONNECT */
143 "Interface received disconnect request.",
144 /* MEMIF_ERR_DISCONNECTED */
145 "Interface is disconnected.",
146 /* MEMIF_ERR_UNKNOWN_MSG */
147 "Unknown message type received on control channel. (internal error)",
148 /* MEMIF_ERR_POLL_CANCEL */
149 "Memif event polling was canceled.",
150 /* MEMIF_ERR_MAX_RING */
151 "Maximum log2 ring size is 15",
152 /* MEMIF_ERR_PRIVHDR */
153 "Private headers not supported."
156 #define MEMIF_ERR_UNDEFINED "undefined error"
159 memif_strerror (int err_code)
161 if (err_code >= ERRLIST_LEN)
163 strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED));
164 memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0';
168 strncpy (memif_buf, memif_errlist[err_code],
169 strlen (memif_errlist[err_code]));
170 memif_buf[strlen (memif_errlist[err_code])] = '\0';
178 return MEMIF_VERSION;
181 #define DBG_TX_BUF (0)
182 #define DBG_RX_BUF (1)
186 print_bytes (void *data, uint16_t len, uint8_t q)
189 printf ("\nTX:\n\t");
191 printf ("\nRX:\n\t");
193 for (i = 0; i < len; i++)
196 printf ("\n%d:\t", i);
197 printf ("%02X ", ((uint8_t *) (data))[i]);
201 #endif /* MEMIF_DBG_SHM */
204 memif_syscall_error_handler (int err_code)
206 DBG ("%s", strerror (err_code));
209 return MEMIF_ERR_SUCCESS;
210 if (err_code == EACCES)
211 return MEMIF_ERR_ACCES;
212 if (err_code == ENFILE)
213 return MEMIF_ERR_FILE_LIMIT;
214 if (err_code == EMFILE)
215 return MEMIF_ERR_PROC_FILE_LIMIT;
216 if (err_code == ENOMEM)
217 return MEMIF_ERR_NOMEM;
218 /* connection refused if master does not exist
219 this error would spam the user until master was created */
221 if (err_code == ECONNREFUSED)
222 return MEMIF_ERR_SUCCESS;
224 if (err_code == ECONNREFUSED)
225 return MEMIF_ERR_CONNREFUSED;
226 if (err_code == EALREADY)
227 return MEMIF_ERR_ALREADY;
228 if (err_code == EAGAIN)
229 return MEMIF_ERR_AGAIN;
230 if (err_code == EBADF)
231 return MEMIF_ERR_BAD_FD;
232 if (err_code == ENOENT)
233 return MEMIF_ERR_NO_FILE;
235 /* other syscall errors */
236 return MEMIF_ERR_SYSCALL;
240 memif_add_epoll_fd (int fd, uint32_t events)
244 DBG ("invalid fd %d", fd);
247 struct epoll_event evt;
248 memset (&evt, 0, sizeof (evt));
251 if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
253 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
256 DBG ("fd %d added to epoll", fd);
261 memif_mod_epoll_fd (int fd, uint32_t events)
265 DBG ("invalid fd %d", fd);
268 struct epoll_event evt;
269 memset (&evt, 0, sizeof (evt));
272 if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
274 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
277 DBG ("fd %d moddified on epoll", fd);
282 memif_del_epoll_fd (int fd)
286 DBG ("invalid fd %d", fd);
289 struct epoll_event evt;
290 memset (&evt, 0, sizeof (evt));
291 if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
293 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
296 DBG ("fd %d removed from epoll", fd);
301 memif_control_fd_update (int fd, uint8_t events, void *private_ctx)
303 if (events & MEMIF_FD_EVENT_DEL)
304 return memif_del_epoll_fd (fd);
307 if (events & MEMIF_FD_EVENT_READ)
309 if (events & MEMIF_FD_EVENT_WRITE)
312 if (events & MEMIF_FD_EVENT_MOD)
313 return memif_mod_epoll_fd (fd, evt);
315 return memif_add_epoll_fd (fd, evt);
319 add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
321 libmemif_main_t *lm = &libmemif_main;
322 memif_list_elt_t *tmp;
325 for (i = 0; i < *len; i++)
327 if ((*list)[i].data_struct == NULL)
329 (*list)[i].key = e->key;
330 (*list)[i].data_struct = e->data_struct;
335 tmp = lm->realloc (*list, sizeof (memif_list_elt_t) * *len * 2);
339 for (i = *len; i < *len * 2; i++)
342 tmp[i].data_struct = NULL;
345 tmp[*len].key = e->key;
346 tmp[*len].data_struct = e->data_struct;
355 get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len,
365 for (i = 0; i < len; i++)
367 if (list[i].key == key)
377 /* does not free memory, only marks element as free */
379 free_list_elt (memif_list_elt_t * list, uint16_t len, int key)
382 for (i = 0; i < len; i++)
384 if (list[i].key == key)
387 list[i].data_struct = NULL;
396 free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
397 memif_connection_t * ctx)
400 for (i = 0; i < len; i++)
402 if (list[i].key == -1)
404 if (list[i].data_struct == ctx)
406 list[i].data_struct = NULL;
416 memif_control_fd_update_register (memif_control_fd_update_t * cb)
418 libmemif_main_t *lm = &libmemif_main;
419 lm->control_fd_update = cb;
423 memif_register_external_region (memif_add_external_region_t * ar,
424 memif_get_external_region_addr_t * gr,
425 memif_del_external_region_t * dr,
426 memif_get_external_buffer_offset_t * go)
428 libmemif_main_t *lm = &libmemif_main;
429 lm->add_external_region = ar;
430 lm->get_external_region_addr = gr;
431 lm->del_external_region = dr;
432 lm->get_external_buffer_offset = go;
436 memif_alloc_register (memif_alloc_t * ma)
438 libmemif_main_t *lm = &libmemif_main;
443 memif_realloc_register (memif_realloc_t * mr)
445 libmemif_main_t *lm = &libmemif_main;
450 memif_free_register (memif_free_t * mf)
452 libmemif_main_t *lm = &libmemif_main;
457 memif_set_connection_request_timer (struct itimerspec timer)
459 libmemif_main_t *lm = &libmemif_main;
460 int err = MEMIF_ERR_SUCCESS;
464 /* overwrite timer, if already armed */
465 if (lm->disconn_slaves != 0)
467 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
469 err = memif_syscall_error_handler (errno);
476 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
477 memif_alloc_t * memif_alloc, memif_realloc_t * memif_realloc,
478 memif_free_t * memif_free)
480 int err = MEMIF_ERR_SUCCESS; /* 0 */
481 libmemif_main_t *lm = &libmemif_main;
482 memset (lm, 0, sizeof (libmemif_main_t));
484 if (memif_alloc != NULL)
486 memif_alloc_register (memif_alloc);
489 memif_alloc_register (malloc);
491 if (memif_realloc != NULL)
493 memif_realloc_register (memif_realloc);
496 memif_realloc_register (realloc);
498 if (memif_free != NULL)
499 memif_free_register (memif_free);
501 memif_free_register (free);
503 if (app_name != NULL)
505 uint8_t len = (strlen (app_name) > MEMIF_NAME_LEN)
506 ? strlen (app_name) : MEMIF_NAME_LEN;
507 strncpy ((char *) lm->app_name, app_name, len);
511 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
512 strlen (MEMIF_DEFAULT_APP_NAME));
515 /* register control fd update callback */
516 if (on_control_fd_update != NULL)
517 memif_control_fd_update_register (on_control_fd_update);
520 memif_epfd = epoll_create (1);
521 memif_control_fd_update_register (memif_control_fd_update);
522 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
525 DBG ("eventfd: %s", strerror (err));
526 return memif_syscall_error_handler (err);
528 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ, NULL);
529 DBG ("libmemif event polling initialized");
532 lm->control_list_len = 2;
533 lm->interrupt_list_len = 2;
534 lm->socket_list_len = 1;
535 lm->pending_list_len = 1;
538 lm->alloc (sizeof (memif_list_elt_t) * lm->control_list_len);
539 if (lm->control_list == NULL)
541 err = MEMIF_ERR_NOMEM;
545 lm->alloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
546 if (lm->interrupt_list == NULL)
548 err = MEMIF_ERR_NOMEM;
552 lm->alloc (sizeof (memif_list_elt_t) * lm->socket_list_len);
553 if (lm->socket_list == NULL)
555 err = MEMIF_ERR_NOMEM;
559 lm->alloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
560 if (lm->pending_list == NULL)
562 err = MEMIF_ERR_NOMEM;
567 for (i = 0; i < lm->control_list_len; i++)
569 lm->control_list[i].key = -1;
570 lm->control_list[i].data_struct = NULL;
572 for (i = 0; i < lm->interrupt_list_len; i++)
574 lm->interrupt_list[i].key = -1;
575 lm->interrupt_list[i].data_struct = NULL;
577 for (i = 0; i < lm->socket_list_len; i++)
579 lm->socket_list[i].key = -1;
580 lm->socket_list[i].data_struct = NULL;
582 for (i = 0; i < lm->pending_list_len; i++)
584 lm->pending_list[i].key = -1;
585 lm->pending_list[i].data_struct = NULL;
588 lm->disconn_slaves = 0;
590 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
593 err = memif_syscall_error_handler (errno);
597 lm->arm.it_value.tv_sec = MEMIF_DEFAULT_RECONNECT_PERIOD_SEC;
598 lm->arm.it_value.tv_nsec = MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC;
599 lm->arm.it_interval.tv_sec = MEMIF_DEFAULT_RECONNECT_PERIOD_SEC;
600 lm->arm.it_interval.tv_nsec = MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC;
602 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ, NULL) < 0)
604 DBG ("callback type memif_control_fd_update_t error!");
605 err = MEMIF_ERR_CB_FDUPDATE;
616 static inline memif_ring_t *
617 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
620 if (&conn->regions[0] == NULL)
622 void *p = conn->regions[0].addr;
624 sizeof (memif_ring_t) +
625 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
626 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
628 return (memif_ring_t *) p;
632 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
635 memif_connection_t *conn = (memif_connection_t *) c;
637 return MEMIF_ERR_NOCONN;
639 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->
640 run_args.num_m2s_rings;
642 return MEMIF_ERR_QID;
644 conn->rx_queues[qid].ring->flags = rx_mode;
645 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
646 return MEMIF_ERR_SUCCESS;
650 memif_socket_start_listening (memif_socket_t * ms)
652 libmemif_main_t *lm = &libmemif_main;
653 memif_list_elt_t elt;
654 struct stat file_stat;
655 struct sockaddr_un un = { 0 };
657 int err = MEMIF_ERR_SUCCESS;
659 if (ms->type == MEMIF_SOCKET_TYPE_CLIENT)
660 return MEMIF_ERR_INVAL_ARG;
662 /* check if file exists */
663 if (stat ((char *) ms->filename, &file_stat) == 0)
665 if (S_ISSOCK (file_stat.st_mode))
666 unlink ((char *) ms->filename);
668 return memif_syscall_error_handler (errno);
671 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
674 err = memif_syscall_error_handler (errno);
678 DBG ("socket %d created", ms->fd);
679 un.sun_family = AF_UNIX;
680 strncpy ((char *) un.sun_path, (char *) ms->filename,
681 sizeof (un.sun_path) - 1);
682 if (setsockopt (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
684 err = memif_syscall_error_handler (errno);
687 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
689 err = memif_syscall_error_handler (errno);
692 if (listen (ms->fd, 1) < 0)
694 err = memif_syscall_error_handler (errno);
697 if (stat ((char *) ms->filename, &file_stat) < 0)
699 err = memif_syscall_error_handler (errno);
703 /* add socket to libmemif main */
705 elt.data_struct = ms;
706 add_list_elt (&elt, &lm->socket_list, &lm->socket_list_len);
707 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ, ms->private_ctx);
709 ms->type = MEMIF_SOCKET_TYPE_LISTENER;
723 memif_create_socket (memif_socket_handle_t * sock, const char *filename,
726 libmemif_main_t *lm = &libmemif_main;
727 memif_socket_t *ms = (memif_socket_t *) * sock;
728 int i, err = MEMIF_ERR_SUCCESS;
730 for (i = 0; i < lm->socket_list_len; i++)
732 if ((ms = (memif_socket_t *) lm->socket_list[i].data_struct) != NULL)
734 if (strncmp ((char *) ms->filename, filename,
735 strlen ((char *) ms->filename)) == 0)
736 return MEMIF_ERR_INVAL_ARG;
740 /* allocate memif_socket_t */
742 ms = lm->alloc (sizeof (memif_socket_t));
745 err = MEMIF_ERR_NOMEM;
748 memset (ms, 0, sizeof (memif_socket_t));
750 ms->filename = lm->alloc (strlen (filename) + sizeof (char));
751 if (ms->filename == NULL)
753 err = MEMIF_ERR_NOMEM;
756 memset (ms->filename, 0, strlen (filename) + sizeof (char));
757 strncpy ((char *) ms->filename, filename, strlen (filename));
759 ms->type = MEMIF_SOCKET_TYPE_NONE;
761 ms->interface_list_len = 1;
763 lm->alloc (sizeof (memif_list_elt_t) * ms->interface_list_len);
764 if (ms->interface_list == NULL)
766 err = MEMIF_ERR_NOMEM;
769 ms->interface_list[0].key = -1;
770 ms->interface_list[0].data_struct = NULL;
779 if (ms->filename != NULL)
781 lm->free (ms->filename);
789 if (ms->interface_list != NULL)
791 lm->free (ms->interface_list);
792 ms->interface_list = NULL;
793 ms->interface_list_len = 0;
802 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
803 memif_connection_update_t * on_connect,
804 memif_connection_update_t * on_disconnect,
805 memif_interrupt_t * on_interrupt, void *private_ctx)
807 libmemif_main_t *lm = &libmemif_main;
809 memif_list_elt_t elt;
810 memif_connection_t *conn = (memif_connection_t *) * c;
815 DBG ("This handle already points to existing memif.");
816 return MEMIF_ERR_CONN;
818 conn = (memif_connection_t *) lm->alloc (sizeof (memif_connection_t));
821 err = MEMIF_ERR_NOMEM;
824 memset (conn, 0, sizeof (memif_connection_t));
826 conn->args.interface_id = args->interface_id;
828 if (args->log2_ring_size == 0)
829 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
830 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
832 err = MEMIF_ERR_MAX_RING;
835 if (args->buffer_size == 0)
836 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
837 if (args->num_s2m_rings == 0)
838 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
839 if (args->num_m2s_rings == 0)
840 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
842 conn->args.num_s2m_rings = args->num_s2m_rings;
843 conn->args.num_m2s_rings = args->num_m2s_rings;
844 conn->args.buffer_size = args->buffer_size;
845 conn->args.log2_ring_size = args->log2_ring_size;
846 conn->args.is_master = args->is_master;
847 conn->args.mode = args->mode;
848 conn->msg_queue = NULL;
849 conn->regions = NULL;
850 conn->tx_queues = NULL;
851 conn->rx_queues = NULL;
853 conn->on_connect = on_connect;
854 conn->on_disconnect = on_disconnect;
855 conn->on_interrupt = on_interrupt;
856 conn->private_ctx = private_ctx;
857 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
859 uint8_t l = strlen ((char *) args->interface_name);
860 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
863 if ((l = strlen ((char *) args->secret)) > 0)
864 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
866 if (args->socket != NULL)
867 conn->args.socket = args->socket;
870 if (lm->default_socket == NULL)
873 memif_create_socket ((memif_socket_handle_t *) &
875 MEMIF_DEFAULT_SOCKET_PATH, NULL);
876 if (err != MEMIF_ERR_SUCCESS)
879 conn->args.socket = lm->default_socket;
881 ms = (memif_socket_t *) conn->args.socket;
883 if ((conn->args.is_master && ms->type == MEMIF_SOCKET_TYPE_CLIENT) ||
884 (!conn->args.is_master && ms->type == MEMIF_SOCKET_TYPE_LISTENER))
886 err = MEMIF_ERR_INVAL_ARG;
890 elt.key = conn->args.interface_id;
891 elt.data_struct = conn;
892 add_list_elt (&elt, &ms->interface_list, &ms->interface_list_len);
895 if (conn->args.is_master)
897 if (ms->type == MEMIF_SOCKET_TYPE_NONE)
898 err = memif_socket_start_listening (ms);
899 if (err != MEMIF_ERR_SUCCESS)
904 lm->disconn_slaves++;
907 elt.data_struct = conn;
909 add_list_elt (&elt, &lm->control_list, &lm->control_list_len)) < 0)
911 err = MEMIF_ERR_NOMEM;
917 /* try connectiong to master */
918 err = memif_request_connection (conn);
919 if ((err < 0) && (lm->disconn_slaves == 1))
921 /* connection failed, arm reconnect timer (if not armed) */
922 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
924 err = memif_syscall_error_handler (errno);
942 memif_request_connection (memif_conn_handle_t c)
944 libmemif_main_t *lm = &libmemif_main;
945 memif_connection_t *conn = (memif_connection_t *) c;
947 int err = MEMIF_ERR_SUCCESS;
949 struct sockaddr_un sun;
952 return MEMIF_ERR_NOCONN;
954 ms = (memif_socket_t *) conn->args.socket;
956 if (conn->args.is_master || ms->type == MEMIF_SOCKET_TYPE_LISTENER)
957 return MEMIF_ERR_INVAL_ARG;
959 return MEMIF_ERR_ALRCONN;
961 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
964 err = memif_syscall_error_handler (errno);
968 sun.sun_family = AF_UNIX;
970 strncpy (sun.sun_path, (char *) ms->filename, sizeof (sun.sun_path) - 1);
972 if (connect (sockfd, (struct sockaddr *) &sun,
973 sizeof (struct sockaddr_un)) == 0)
976 conn->read_fn = memif_conn_fd_read_ready;
977 conn->write_fn = memif_conn_fd_write_ready;
978 conn->error_fn = memif_conn_fd_error;
980 lm->control_list[conn->index].key = conn->fd;
982 lm->control_fd_update (sockfd,
983 MEMIF_FD_EVENT_READ |
984 MEMIF_FD_EVENT_WRITE, conn->private_ctx);
986 lm->disconn_slaves--;
987 if (lm->disconn_slaves == 0)
989 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
991 err = memif_syscall_error_handler (errno);
998 strcpy ((char *) conn->remote_disconnect_string,
999 memif_strerror (memif_syscall_error_handler (errno)));
1003 ms->type = MEMIF_SOCKET_TYPE_CLIENT;
1015 memif_control_fd_handler (int fd, uint8_t events)
1017 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1019 memif_list_elt_t *e = NULL;
1020 memif_connection_t *conn;
1021 libmemif_main_t *lm = &libmemif_main;
1022 if (fd == lm->timerfd)
1026 size = read (fd, &b, sizeof (b));
1031 for (i = 0; i < lm->control_list_len; i++)
1033 if ((lm->control_list[i].key < 0)
1034 && (lm->control_list[i].data_struct != NULL))
1036 conn = lm->control_list[i].data_struct;
1037 if (conn->args.is_master)
1039 err = memif_request_connection (conn);
1040 if (err != MEMIF_ERR_SUCCESS)
1041 DBG ("memif_request_connection: %s", memif_strerror (err));
1047 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
1050 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
1053 (((memif_connection_t *) e->data_struct)->
1054 args.is_master) ? ((memif_connection_t *) e->
1055 data_struct)->run_args.
1056 num_s2m_rings : ((memif_connection_t *) e->data_struct)->
1057 run_args.num_m2s_rings;
1058 for (i = 0; i < num; i++)
1060 if (((memif_connection_t *) e->data_struct)->
1061 rx_queues[i].int_fd == fd)
1063 ((memif_connection_t *) e->data_struct)->
1064 on_interrupt ((void *) e->data_struct,
1065 ((memif_connection_t *) e->
1066 data_struct)->private_ctx, i);
1067 return MEMIF_ERR_SUCCESS;
1071 return MEMIF_ERR_SUCCESS;
1073 get_list_elt (&e, lm->socket_list, lm->socket_list_len, fd);
1075 && ((memif_socket_t *) e->data_struct)->type ==
1076 MEMIF_SOCKET_TYPE_LISTENER)
1079 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
1083 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
1086 err = memif_read_ready (fd);
1090 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
1093 if (events & MEMIF_FD_EVENT_READ)
1096 ((memif_connection_t *) e->data_struct)->
1097 read_fn (e->data_struct);
1098 if (err != MEMIF_ERR_SUCCESS)
1101 if (events & MEMIF_FD_EVENT_WRITE)
1104 ((memif_connection_t *) e->data_struct)->
1105 write_fn (e->data_struct);
1106 if (err != MEMIF_ERR_SUCCESS)
1109 if (events & MEMIF_FD_EVENT_ERROR)
1112 ((memif_connection_t *) e->data_struct)->
1113 error_fn (e->data_struct);
1114 if (err != MEMIF_ERR_SUCCESS)
1120 return MEMIF_ERR_SUCCESS; /* 0 */
1127 memif_poll_event (int timeout)
1129 struct epoll_event evt;
1130 int en = 0, err = MEMIF_ERR_SUCCESS; /* 0 */
1131 uint32_t events = 0;
1132 uint64_t counter = 0;
1134 memset (&evt, 0, sizeof (evt));
1135 evt.events = EPOLLIN | EPOLLOUT;
1137 sigemptyset (&sigset);
1138 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
1142 DBG ("epoll_pwait: %s", strerror (err));
1143 return memif_syscall_error_handler (err);
1147 if (evt.data.fd == poll_cancel_fd)
1149 r = read (evt.data.fd, &counter, sizeof (counter));
1151 return MEMIF_ERR_DISCONNECTED;
1153 return MEMIF_ERR_POLL_CANCEL;
1155 if (evt.events & EPOLLIN)
1156 events |= MEMIF_FD_EVENT_READ;
1157 if (evt.events & EPOLLOUT)
1158 events |= MEMIF_FD_EVENT_WRITE;
1159 if (evt.events & EPOLLERR)
1160 events |= MEMIF_FD_EVENT_ERROR;
1161 err = memif_control_fd_handler (evt.data.fd, events);
1168 memif_cancel_poll_event ()
1170 uint64_t counter = 1;
1173 if (poll_cancel_fd == -1)
1175 w = write (poll_cancel_fd, &counter, sizeof (counter));
1176 if (w < sizeof (counter))
1177 return MEMIF_ERR_INT_WRITE;
1183 memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
1187 memif_msg_queue_free (lm, &(*e)->next);
1193 /* send disconnect msg and close interface */
1195 memif_disconnect_internal (memif_connection_t * c)
1199 DBG ("no connection");
1200 return MEMIF_ERR_NOCONN;
1203 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1205 libmemif_main_t *lm = &libmemif_main;
1206 memif_list_elt_t *e;
1208 c->on_disconnect ((void *) c, c->private_ctx);
1212 memif_msg_send_disconnect (c->fd, (uint8_t *) "interface deleted", 0);
1213 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL, c->private_ctx);
1216 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1219 if (c->args.is_master)
1220 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1221 e->key = c->fd = -1;
1224 if (c->tx_queues != NULL)
1227 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1228 run_args.num_s2m_rings;
1229 for (i = 0; i < num; i++)
1231 mq = &c->tx_queues[i];
1236 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1241 lm->free (c->tx_queues);
1242 c->tx_queues = NULL;
1245 if (c->rx_queues != NULL)
1248 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1249 run_args.num_m2s_rings;
1250 for (i = 0; i < num; i++)
1252 mq = &c->rx_queues[i];
1257 if (c->on_interrupt != NULL)
1258 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL,
1262 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1267 lm->free (c->rx_queues);
1268 c->rx_queues = NULL;
1271 for (i = 0; i < c->regions_num; i++)
1273 if (&c->regions[i] == NULL)
1275 if (c->regions[i].is_external != 0)
1277 lm->del_external_region (c->regions[i].addr,
1278 c->regions[i].region_size,
1279 c->regions[i].fd, c->private_ctx);
1283 if (munmap (c->regions[i].addr, c->regions[i].region_size) < 0)
1284 return memif_syscall_error_handler (errno);
1285 if (c->regions[i].fd > 0)
1286 close (c->regions[i].fd);
1287 c->regions[i].fd = -1;
1290 lm->free (c->regions);
1294 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1296 memif_msg_queue_free (lm, &c->msg_queue);
1298 if (!(c->args.is_master))
1300 if (lm->disconn_slaves == 0)
1302 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1304 err = memif_syscall_error_handler (errno);
1305 DBG ("timerfd_settime: arm");
1308 lm->disconn_slaves++;
1315 memif_delete_socket (memif_socket_handle_t * sock)
1317 memif_socket_t *ms = (memif_socket_t *) * sock;
1318 libmemif_main_t *lm = &libmemif_main;
1320 /* check if socket is in use */
1321 if (ms == NULL || ms->type != MEMIF_SOCKET_TYPE_NONE)
1322 return MEMIF_ERR_INVAL_ARG;
1324 lm->free (ms->interface_list);
1325 ms->interface_list = NULL;
1326 lm->free (ms->filename);
1327 ms->filename = NULL;
1331 return MEMIF_ERR_SUCCESS;
1335 memif_delete (memif_conn_handle_t * conn)
1337 memif_connection_t *c = (memif_connection_t *) * conn;
1338 libmemif_main_t *lm = &libmemif_main;
1339 memif_socket_t *ms = NULL;
1340 int err = MEMIF_ERR_SUCCESS;
1344 DBG ("no connection");
1345 return MEMIF_ERR_NOCONN;
1350 DBG ("DISCONNECTING");
1351 err = memif_disconnect_internal (c);
1352 if (err == MEMIF_ERR_NOCONN)
1356 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1358 ms = (memif_socket_t *) c->args.socket;
1360 free_list_elt (ms->interface_list, ms->interface_list_len,
1361 c->args.interface_id);
1362 if (ms->use_count <= 0)
1364 /* stop listening on this socket */
1365 if (ms->type == MEMIF_SOCKET_TYPE_LISTENER)
1367 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_DEL, ms->private_ctx);
1368 free_list_elt (lm->socket_list, lm->socket_list_len, ms->fd);
1372 /* socket not in use */
1373 ms->type = MEMIF_SOCKET_TYPE_NONE;
1376 if (!c->args.is_master)
1378 lm->disconn_slaves--;
1379 if (lm->disconn_slaves <= 0)
1381 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1383 err = memif_syscall_error_handler (errno);
1384 DBG ("timerfd_settime: disarm");
1397 memif_connect1 (memif_connection_t * c)
1399 libmemif_main_t *lm = &libmemif_main;
1404 for (i = 0; i < c->regions_num; i++)
1406 mr = &c->regions[i];
1411 if (mr->is_external)
1413 if (lm->get_external_region_addr == NULL)
1414 return MEMIF_ERR_INVAL_ARG;
1416 lm->get_external_region_addr (mr->region_size, mr->fd,
1422 return MEMIF_ERR_NO_SHMFD;
1425 mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1426 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1428 return memif_syscall_error_handler (errno);
1435 for (i = 0; i < c->rx_queues_num; i++)
1437 mq = &c->rx_queues[i];
1440 mq->ring = c->regions[mq->region].addr + mq->offset;
1441 if (mq->ring->cookie != MEMIF_COOKIE)
1443 DBG ("wrong cookie on rx ring %u", i);
1444 return MEMIF_ERR_COOKIE;
1446 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1451 for (i = 0; i < c->tx_queues_num; i++)
1453 mq = &c->tx_queues[i];
1456 mq->ring = c->regions[mq->region].addr + mq->offset;
1457 if (mq->ring->cookie != MEMIF_COOKIE)
1459 DBG ("wrong cookie on tx ring %u", i);
1460 return MEMIF_ERR_COOKIE;
1462 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1467 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD,
1474 memif_add_region (libmemif_main_t * lm, memif_connection_t * conn,
1475 uint8_t has_buffers)
1480 lm->realloc (conn->regions,
1481 sizeof (memif_region_t) * ++conn->regions_num);
1483 return MEMIF_ERR_NOMEM;
1486 r = &conn->regions[conn->regions_num - 1];
1487 memset (r, 0, sizeof (memif_region_t));
1489 if (has_buffers != 0)
1491 r->buffer_offset = 0;
1496 (conn->run_args.num_s2m_rings +
1497 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1498 sizeof (memif_desc_t) *
1500 run_args.log2_ring_size));
1503 r->region_size = (has_buffers == 0) ? r->buffer_offset : r->buffer_offset +
1504 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1505 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1507 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1508 return memif_syscall_error_handler (errno);
1510 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1511 return memif_syscall_error_handler (errno);
1513 if ((ftruncate (r->fd, r->region_size)) == -1)
1514 return memif_syscall_error_handler (errno);
1516 if ((r->addr = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1517 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1518 return memif_syscall_error_handler (errno);
1520 return MEMIF_ERR_SUCCESS;
1524 memif_init_queues (libmemif_main_t * lm, memif_connection_t * conn)
1529 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1531 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1532 DBG ("RING: %p I: %d", ring, i);
1533 ring->head = ring->tail = 0;
1534 ring->cookie = MEMIF_COOKIE;
1536 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1538 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1539 ring->desc[j].region = 1;
1540 ring->desc[j].offset =
1541 conn->regions[1].buffer_offset +
1542 (uint32_t) (slot * conn->run_args.buffer_size);
1543 ring->desc[j].length = conn->run_args.buffer_size;
1546 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1548 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1549 DBG ("RING: %p I: %d", ring, i);
1550 ring->head = ring->tail = 0;
1551 ring->cookie = MEMIF_COOKIE;
1553 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1555 uint16_t slot = (i + conn->run_args.num_s2m_rings) *
1556 (1 << conn->run_args.log2_ring_size) + j;
1557 ring->desc[j].region = 1;
1558 ring->desc[j].offset =
1559 conn->regions[1].buffer_offset +
1560 (uint32_t) (slot * conn->run_args.buffer_size);
1561 ring->desc[j].length = conn->run_args.buffer_size;
1565 DBG ("alloc: %p", lm->alloc);
1566 DBG ("size: %lu", sizeof (memif_queue_t) * conn->run_args.num_s2m_rings);
1568 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1569 conn->run_args.num_s2m_rings);
1571 return MEMIF_ERR_NOMEM;
1575 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1577 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1578 return memif_syscall_error_handler (errno);
1579 e.key = mq[x].int_fd;
1580 e.data_struct = conn;
1581 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1583 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1584 DBG ("RING: %p I: %d", mq[x].ring, x);
1585 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1588 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1589 mq[x].last_head = mq[x].last_tail = 0;
1590 mq[x].alloc_bufs = 0;
1592 conn->tx_queues = mq;
1595 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1596 conn->run_args.num_m2s_rings);
1598 return MEMIF_ERR_NOMEM;
1600 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1602 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1603 return memif_syscall_error_handler (errno);
1604 e.key = mq[x].int_fd;
1605 e.data_struct = conn;
1606 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1608 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1609 DBG ("RING: %p I: %d", mq[x].ring, x);
1610 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1613 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1614 mq[x].last_head = mq[x].last_tail = 0;
1615 mq[x].alloc_bufs = 0;
1617 conn->rx_queues = mq;
1619 return MEMIF_ERR_SUCCESS;
1623 memif_init_regions_and_queues (memif_connection_t * conn)
1626 libmemif_main_t *lm = &libmemif_main;
1628 /* region 0. rings */
1629 memif_add_region (lm, conn, /* has_buffers */ 0);
1631 /* region 1. buffers */
1632 if (lm->add_external_region)
1635 (memif_region_t *) lm->realloc (conn->regions,
1636 sizeof (memif_region_t) *
1637 ++conn->regions_num);
1639 return MEMIF_ERR_NOMEM;
1642 conn->regions[1].region_size =
1643 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1644 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1645 conn->regions[1].buffer_offset = 0;
1646 lm->add_external_region (&conn->regions[1].addr,
1647 conn->regions[1].region_size,
1648 &conn->regions[1].fd, conn->private_ctx);
1649 conn->regions[1].is_external = 1;
1653 memif_add_region (lm, conn, 1);
1656 memif_init_queues (lm, conn);
1662 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1663 memif_buffer_t * bufs, uint16_t count,
1664 uint16_t * count_out)
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_m2s_rings : c->
1673 run_args.num_s2m_rings;
1674 if (EXPECT_FALSE (qid >= num))
1675 return MEMIF_ERR_QID;
1676 if (EXPECT_FALSE (!count_out))
1677 return MEMIF_ERR_INVAL_ARG;
1678 if (EXPECT_FALSE (c->args.is_master))
1679 return MEMIF_ERR_INVAL_ARG;
1681 memif_queue_t *mq = &c->tx_queues[qid];
1682 memif_ring_t *ring = mq->ring;
1684 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1687 int err = MEMIF_ERR_SUCCESS; /* 0 */
1690 ring_size = (1 << mq->log2_ring_size);
1691 slot = (c->args.is_master) ? ring->tail : ring->head;
1692 slot += mq->alloc_bufs;
1694 /* can only be called by slave */
1695 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1701 if (EXPECT_FALSE ((b0->flags & MEMIF_BUFFER_FLAG_RX) == 0))
1703 /* not a valid buffer */
1707 b0->flags &= ~MEMIF_BUFFER_FLAG_RX;
1709 ((memif_ring_t *) b0->ring)->desc[b0->desc_index & mask].offset = ring->desc[slot & mask].offset; /* put free buffer on rx ring */
1711 ring->desc[slot & mask].offset =
1712 (uint32_t) (b0->data -
1713 c->regions[ring->desc[slot & mask].region].addr);
1714 ring->desc[slot & mask].flags |=
1715 (b0->flags & MEMIF_BUFFER_FLAG_NEXT) ? MEMIF_DESC_FLAG_NEXT : 0;
1717 b0->desc_index = slot;
1728 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1733 DBG ("ring buffer full! qid: %u", qid);
1734 err = MEMIF_ERR_NOBUF_RING;
1741 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1742 memif_buffer_t * bufs, uint16_t count,
1743 uint16_t * count_out, uint16_t size)
1745 memif_connection_t *c = (memif_connection_t *) conn;
1746 if (EXPECT_FALSE (c == NULL))
1747 return MEMIF_ERR_NOCONN;
1748 if (EXPECT_FALSE (c->fd < 0))
1749 return MEMIF_ERR_DISCONNECTED;
1751 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1752 run_args.num_s2m_rings;
1753 if (EXPECT_FALSE (qid >= num))
1754 return MEMIF_ERR_QID;
1755 if (EXPECT_FALSE (!count_out))
1756 return MEMIF_ERR_INVAL_ARG;
1758 libmemif_main_t *lm = &libmemif_main;
1759 memif_queue_t *mq = &c->tx_queues[qid];
1760 memif_ring_t *ring = mq->ring;
1762 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1763 uint32_t offset_mask = c->run_args.buffer_size - 1;
1766 int err = MEMIF_ERR_SUCCESS; /* 0 */
1767 uint16_t dst_left, src_left;
1768 uint16_t saved_count;
1769 memif_buffer_t *saved_b;
1772 ring_size = (1 << mq->log2_ring_size);
1773 slot = (c->args.is_master) ? ring->tail : ring->head;
1774 slot += mq->alloc_bufs;
1776 if (c->args.is_master)
1777 ns = ring->head - (ring->tail + mq->alloc_bufs);
1779 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1783 b0 = (bufs + *count_out);
1786 saved_count = count;
1788 b0->desc_index = slot;
1789 ring->desc[slot & mask].flags = 0;
1791 /* slave can produce buffer with original length */
1792 dst_left = (c->args.is_master) ? ring->desc[slot & mask].length :
1793 c->run_args.buffer_size;
1798 if (EXPECT_FALSE (dst_left == 0))
1807 ring->desc[b0->desc_index & mask].flags |=
1808 MEMIF_DESC_FLAG_NEXT;
1809 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1811 b0 = (bufs + *count_out);
1812 b0->desc_index = slot;
1814 (c->args.is_master) ? ring->desc[slot & mask].
1815 length : c->run_args.buffer_size;
1816 ring->desc[slot & mask].flags = 0;
1820 /* rollback allocated chain buffers */
1821 memset (saved_b, 0, sizeof (memif_buffer_t)
1822 * (saved_count - count + 1));
1823 *count_out -= saved_count - count;
1824 mq->alloc_bufs = saved_count - count;
1828 b0->len = memif_min (dst_left, src_left);
1830 /* slave resets buffer offset */
1831 if (c->args.is_master == 0)
1833 memif_desc_t *d = &ring->desc[slot & mask];
1834 if (lm->get_external_buffer_offset)
1835 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1837 d->offset = d->offset - (d->offset & offset_mask);
1839 b0->data = memif_get_buffer (c, ring, slot & mask);
1841 src_left -= b0->len;
1842 dst_left -= b0->len;
1854 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1859 DBG ("ring buffer full! qid: %u", qid);
1860 err = MEMIF_ERR_NOBUF_RING;
1867 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1870 memif_connection_t *c = (memif_connection_t *) conn;
1871 if (EXPECT_FALSE (c == NULL))
1872 return MEMIF_ERR_NOCONN;
1873 if (EXPECT_FALSE (c->fd < 0))
1874 return MEMIF_ERR_DISCONNECTED;
1876 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1877 run_args.num_m2s_rings;
1878 if (EXPECT_FALSE (qid >= num))
1879 return MEMIF_ERR_QID;
1880 libmemif_main_t *lm = &libmemif_main;
1881 memif_queue_t *mq = &c->rx_queues[qid];
1882 memif_ring_t *ring = mq->ring;
1883 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1884 uint32_t offset_mask = c->run_args.buffer_size - 1;
1887 if (c->args.is_master)
1889 MEMIF_MEMORY_BARRIER ();
1891 (ring->tail + count <=
1892 mq->last_head) ? ring->tail + count : mq->last_head;
1893 return MEMIF_ERR_SUCCESS;
1896 uint16_t head = ring->head;
1897 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1898 head += (count < ns) ? count : ns;
1904 d = &ring->desc[slot & mask];
1906 d->length = c->run_args.buffer_size - headroom;
1907 if (lm->get_external_buffer_offset)
1908 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1910 d->offset = d->offset - (d->offset & offset_mask) + headroom;
1914 MEMIF_MEMORY_BARRIER ();
1917 return MEMIF_ERR_SUCCESS; /* 0 */
1921 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1922 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1924 memif_connection_t *c = (memif_connection_t *) conn;
1925 if (EXPECT_FALSE (c == NULL))
1926 return MEMIF_ERR_NOCONN;
1927 if (EXPECT_FALSE (c->fd < 0))
1928 return MEMIF_ERR_DISCONNECTED;
1930 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1931 run_args.num_s2m_rings;
1932 if (EXPECT_FALSE (qid >= num))
1933 return MEMIF_ERR_QID;
1934 if (EXPECT_FALSE (!tx))
1935 return MEMIF_ERR_INVAL_ARG;
1937 memif_queue_t *mq = &c->tx_queues[qid];
1938 memif_ring_t *ring = mq->ring;
1939 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1943 if (count > mq->alloc_bufs)
1944 count = mq->alloc_bufs;
1946 if (EXPECT_FALSE (count == 0))
1947 return MEMIF_ERR_SUCCESS;
1952 ring->desc[b0->desc_index & mask].length = b0->len;
1954 #ifdef MEMIF_DBG_SHM
1955 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1956 printf ("data: %p\n",
1957 memif_get_buffer (c, ring, b0->desc_index & mask));
1958 printf ("index: %u\n", b0->desc_index);
1959 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1960 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1961 #endif /* MEMIF_DBG_SHM */
1968 MEMIF_MEMORY_BARRIER ();
1969 if (c->args.is_master)
1970 ring->tail = b0->desc_index + 1;
1972 ring->head = b0->desc_index + 1;
1974 mq->alloc_bufs -= *tx;
1976 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1979 int r = write (mq->int_fd, &a, sizeof (a));
1981 return MEMIF_ERR_INT_WRITE;
1984 return MEMIF_ERR_SUCCESS; /* 0 */
1988 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1989 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1991 memif_connection_t *c = (memif_connection_t *) conn;
1992 if (EXPECT_FALSE (c == NULL))
1993 return MEMIF_ERR_NOCONN;
1994 if (EXPECT_FALSE (c->fd < 0))
1995 return MEMIF_ERR_DISCONNECTED;
1997 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1998 run_args.num_m2s_rings;
1999 if (EXPECT_FALSE (qid >= num))
2000 return MEMIF_ERR_QID;
2001 if (EXPECT_FALSE (!rx))
2002 return MEMIF_ERR_INVAL_ARG;
2004 memif_queue_t *mq = &c->rx_queues[qid];
2005 memif_ring_t *ring = mq->ring;
2006 uint16_t cur_slot, last_slot;
2008 uint16_t mask = (1 << mq->log2_ring_size) - 1;
2013 ssize_t r = read (mq->int_fd, &b, sizeof (b));
2014 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
2015 return memif_syscall_error_handler (errno);
2017 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
2018 last_slot = (c->args.is_master) ? ring->head : ring->tail;
2019 if (cur_slot == last_slot)
2020 return MEMIF_ERR_SUCCESS;
2022 ns = last_slot - cur_slot;
2028 b0->desc_index = cur_slot;
2029 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
2030 b0->len = ring->desc[cur_slot & mask].length;
2031 /* slave resets buffer length */
2032 if (c->args.is_master == 0)
2034 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
2037 b0->flags = MEMIF_BUFFER_FLAG_RX;
2038 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
2040 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
2041 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
2043 /* b0->offset = ring->desc[cur_slot & mask].offset;*/
2045 #ifdef MEMIF_DBG_SHM
2046 printf ("data: %p\n", b0->data);
2047 printf ("index: %u\n", b0->desc_index);
2048 printf ("ring: %p\n", b0->ring);
2049 print_bytes (b0->data, b0->len, DBG_RX_BUF);
2050 #endif /* MEMIF_DBG_SHM */
2058 if (c->args.is_master)
2059 mq->last_head = cur_slot;
2061 mq->last_tail = cur_slot;
2065 DBG ("not enough buffers!");
2066 return MEMIF_ERR_NOBUF;
2069 return MEMIF_ERR_SUCCESS; /* 0 */
2073 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
2074 char *buf, ssize_t buflen)
2076 libmemif_main_t *lm = &libmemif_main;
2077 memif_connection_t *c = (memif_connection_t *) conn;
2079 int err = MEMIF_ERR_SUCCESS, i;
2083 return MEMIF_ERR_NOCONN;
2085 ms = (memif_socket_t *) c->args.socket;
2087 l1 = strlen ((char *) c->args.interface_name);
2088 if (l0 + l1 < buflen)
2091 (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
2095 err = MEMIF_ERR_NOBUF_DET;
2097 l1 = strlen ((char *) lm->app_name);
2098 if (l0 + l1 < buflen)
2100 md->inst_name = (uint8_t *) strcpy (buf + l0, (char *) lm->app_name);
2104 err = MEMIF_ERR_NOBUF_DET;
2106 l1 = strlen ((char *) c->remote_if_name);
2107 if (l0 + l1 < buflen)
2109 md->remote_if_name =
2110 (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
2114 err = MEMIF_ERR_NOBUF_DET;
2116 l1 = strlen ((char *) c->remote_name);
2117 if (l0 + l1 < buflen)
2119 md->remote_inst_name =
2120 (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
2124 err = MEMIF_ERR_NOBUF_DET;
2126 md->id = c->args.interface_id;
2128 if (strlen ((char *) c->args.secret) > 0)
2130 l1 = strlen ((char *) c->args.secret);
2131 if (l0 + l1 < buflen)
2133 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
2137 err = MEMIF_ERR_NOBUF_DET;
2140 md->role = (c->args.is_master) ? 0 : 1;
2141 md->mode = c->args.mode;
2143 l1 = strlen ((char *) ms->filename);
2144 if (l0 + l1 < buflen)
2146 md->socket_filename =
2147 (uint8_t *) strcpy (buf + l0, (char *) ms->filename);
2151 err = MEMIF_ERR_NOBUF_DET;
2153 l1 = strlen ((char *) c->remote_disconnect_string);
2154 if (l0 + l1 < buflen)
2157 (uint8_t *) strcpy (buf + l0, (char *) c->remote_disconnect_string);
2161 err = MEMIF_ERR_NOBUF_DET;
2163 md->regions_num = c->regions_num;
2164 l1 = sizeof (memif_region_details_t) * md->regions_num;
2165 if (l0 + l1 <= buflen)
2167 md->regions = (memif_region_details_t *) (buf + l0);
2168 for (i = 0; i < md->regions_num; i++)
2170 md->regions[i].index = i;
2171 md->regions[i].addr = c->regions[i].addr;
2172 md->regions[i].size = c->regions[i].region_size;
2173 md->regions[i].fd = c->regions[i].fd;
2174 md->regions[i].is_external = c->regions[i].is_external;
2179 err = MEMIF_ERR_NOBUF_DET;
2182 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2183 run_args.num_m2s_rings;
2185 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
2186 if (l0 + l1 <= buflen)
2188 md->rx_queues = (memif_queue_details_t *) (buf + l0);
2189 for (i = 0; i < md->rx_queues_num; i++)
2191 md->rx_queues[i].region = c->rx_queues[i].region;
2192 md->rx_queues[i].qid = i;
2193 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2194 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2195 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2196 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2197 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2202 err = MEMIF_ERR_NOBUF_DET;
2205 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
2206 run_args.num_s2m_rings;
2208 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2209 if (l0 + l1 <= buflen)
2211 md->tx_queues = (memif_queue_details_t *) (buf + l0);
2212 for (i = 0; i < md->tx_queues_num; i++)
2214 md->tx_queues[i].region = c->tx_queues[i].region;
2215 md->tx_queues[i].qid = i;
2216 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2217 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2218 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2219 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2220 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2225 err = MEMIF_ERR_NOBUF_DET;
2227 md->link_up_down = (c->fd > 0) ? 1 : 0;
2233 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2235 memif_connection_t *c = (memif_connection_t *) conn;
2240 return MEMIF_ERR_NOCONN;
2242 return MEMIF_ERR_DISCONNECTED;
2245 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2246 run_args.num_m2s_rings;
2248 return MEMIF_ERR_QID;
2250 *efd = c->rx_queues[qid].int_fd;
2252 return MEMIF_ERR_SUCCESS;
2258 libmemif_main_t *lm = &libmemif_main;
2260 memif_delete_socket ((memif_socket_handle_t *) &lm->default_socket);
2262 if (lm->control_list)
2263 lm->free (lm->control_list);
2264 lm->control_list = NULL;
2265 if (lm->interrupt_list)
2266 lm->free (lm->interrupt_list);
2267 lm->interrupt_list = NULL;
2268 if (lm->socket_list)
2269 lm->free (lm->socket_list);
2270 lm->socket_list = NULL;
2271 if (lm->pending_list)
2272 lm->free (lm->pending_list);
2273 lm->pending_list = NULL;
2274 if (poll_cancel_fd != -1)
2275 close (poll_cancel_fd);
2277 return MEMIF_ERR_SUCCESS; /* 0 */