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);
689 if ((l = strlen ((char *) args->secret)) > 0)
691 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
694 if (conn->args.is_master)
696 conn->run_args.buffer_size = conn->args.buffer_size;
698 memif_list_elt_t elt;
699 for (i = 0; i < lm->listener_list_len; i++)
702 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
705 ((char *) ms->filename, (char *) conn->args.socket_filename,
706 strlen ((char *) ms->filename)) == 0)
708 /* add interface to listener socket */
709 elt.key = conn->args.interface_id;
710 *c = elt.data_struct = conn;
711 add_list_elt (&elt, &ms->interface_list,
712 &ms->interface_list_len);
714 conn->listener_fd = ms->fd;
720 struct stat file_stat;
721 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
723 if (S_ISSOCK (file_stat.st_mode))
724 unlink ((char *) conn->args.socket_filename);
726 return memif_syscall_error_handler (errno);
728 DBG ("creating socket file");
729 ms = lm->alloc (sizeof (memif_socket_t));
732 err = MEMIF_ERR_NOMEM;
736 lm->alloc (strlen ((char *) conn->args.socket_filename) +
738 if (ms->filename == NULL)
740 err = MEMIF_ERR_NOMEM;
743 memset (ms->filename, 0,
744 strlen ((char *) conn->args.socket_filename) +
746 strncpy ((char *) ms->filename,
747 (char *) conn->args.socket_filename,
748 strlen ((char *) conn->args.socket_filename));
749 ms->interface_list_len = 1;
751 lm->alloc (sizeof (memif_list_elt_t) *
752 ms->interface_list_len);
753 if (ms->interface_list == NULL)
755 err = MEMIF_ERR_NOMEM;
758 ms->interface_list[0].key = -1;
759 ms->interface_list[0].data_struct = NULL;
760 struct sockaddr_un un = { 0 };
763 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
766 err = memif_syscall_error_handler (errno);
769 DBG ("socket %d created", ms->fd);
770 un.sun_family = AF_UNIX;
771 strncpy ((char *) un.sun_path, (char *) ms->filename,
772 sizeof (un.sun_path) - 1);
775 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
777 err = memif_syscall_error_handler (errno);
781 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
783 err = memif_syscall_error_handler (errno);
787 if (listen (ms->fd, 1) < 0)
789 err = memif_syscall_error_handler (errno);
793 if (stat ((char *) ms->filename, &file_stat) < 0)
795 err = memif_syscall_error_handler (errno);
799 /* add interface to listener socket */
800 elt.key = conn->args.interface_id;
801 *c = elt.data_struct = conn;
802 add_list_elt (&elt, &ms->interface_list,
803 &ms->interface_list_len);
805 conn->listener_fd = ms->fd;
807 /* add listener socket to libmemif main */
809 elt.data_struct = ms;
810 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
811 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
818 if (lm->disconn_slaves == 0)
820 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
822 err = memif_syscall_error_handler (errno);
827 lm->disconn_slaves++;
830 *c = list_elt.data_struct = conn;
832 add_list_elt (&list_elt, &lm->control_list,
833 &lm->control_list_len)) < 0)
835 err = MEMIF_ERR_NOMEM;
848 if (conn->args.socket_filename)
849 lm->free (conn->args.socket_filename);
857 memif_control_fd_handler (int fd, uint8_t events)
859 int i, rv, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */
861 memif_list_elt_t *e = NULL;
862 memif_connection_t *conn;
863 libmemif_main_t *lm = &libmemif_main;
864 if (fd == lm->timerfd)
868 size = read (fd, &b, sizeof (b));
869 for (i = 0; i < lm->control_list_len; i++)
871 if ((lm->control_list[i].key < 0)
872 && (lm->control_list[i].data_struct != NULL))
874 conn = lm->control_list[i].data_struct;
875 if (conn->args.is_master)
878 struct sockaddr_un sun;
879 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
882 err = memif_syscall_error_handler (errno);
886 sun.sun_family = AF_UNIX;
888 strncpy (sun.sun_path, (char*) conn->args.socket_filename,
889 sizeof (sun.sun_path) - 1);
891 if (connect (sockfd, (struct sockaddr *) &sun,
892 sizeof (struct sockaddr_un)) == 0)
895 conn->read_fn = memif_conn_fd_read_ready;
896 conn->write_fn = memif_conn_fd_write_ready;
897 conn->error_fn = memif_conn_fd_error;
899 lm->control_list[conn->index].key = conn->fd;
901 lm->control_fd_update (sockfd,
902 MEMIF_FD_EVENT_READ |
903 MEMIF_FD_EVENT_WRITE);
905 lm->disconn_slaves--;
906 if (lm->disconn_slaves == 0)
908 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL)
911 err = memif_syscall_error_handler (errno);
918 err = memif_syscall_error_handler (errno);
926 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
929 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
932 (((memif_connection_t *) e->data_struct)->args.
933 is_master) ? ((memif_connection_t *) e->data_struct)->
934 run_args.num_s2m_rings : ((memif_connection_t *) e->
935 data_struct)->run_args.
937 for (i = 0; i < num; i++)
939 if (((memif_connection_t *) e->data_struct)->rx_queues[i].
942 ((memif_connection_t *) e->
943 data_struct)->on_interrupt ((void *) e->data_struct,
944 ((memif_connection_t *)
947 return MEMIF_ERR_SUCCESS;
951 return MEMIF_ERR_SUCCESS;
953 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
956 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
957 return MEMIF_ERR_SUCCESS;
960 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
963 memif_read_ready (fd);
964 return MEMIF_ERR_SUCCESS;
967 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
970 if (events & MEMIF_FD_EVENT_READ)
973 ((memif_connection_t *) e->data_struct)->read_fn (e->
975 if (err != MEMIF_ERR_SUCCESS)
978 if (events & MEMIF_FD_EVENT_WRITE)
981 ((memif_connection_t *) e->data_struct)->write_fn (e->
983 if (err != MEMIF_ERR_SUCCESS)
986 if (events & MEMIF_FD_EVENT_ERROR)
989 ((memif_connection_t *) e->data_struct)->error_fn (e->
991 if (err != MEMIF_ERR_SUCCESS)
997 return MEMIF_ERR_SUCCESS; /* 0 */
1007 memif_poll_event (int timeout)
1009 libmemif_main_t *lm = &libmemif_main;
1010 memif_list_elt_t *elt;
1011 struct epoll_event evt, *e;
1012 int en = 0, err = MEMIF_ERR_SUCCESS, i = 0; /* 0 */
1014 uint32_t events = 0;
1015 uint64_t counter = 0;
1017 memset (&evt, 0, sizeof (evt));
1018 evt.events = EPOLLIN | EPOLLOUT;
1020 sigemptyset (&sigset);
1021 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
1025 DBG ("epoll_pwait: %s", strerror (err));
1026 return memif_syscall_error_handler (err);
1030 if (evt.data.fd == poll_cancel_fd)
1032 r = read (evt.data.fd, &counter, sizeof (counter));
1033 return MEMIF_ERR_POLL_CANCEL;
1035 if (evt.events & EPOLLIN)
1036 events |= MEMIF_FD_EVENT_READ;
1037 if (evt.events & EPOLLOUT)
1038 events |= MEMIF_FD_EVENT_WRITE;
1039 if (evt.events & EPOLLERR)
1040 events |= MEMIF_FD_EVENT_ERROR;
1041 err = memif_control_fd_handler (evt.data.fd, events);
1048 memif_cancel_poll_event ()
1050 uint64_t counter = 1;
1053 if (poll_cancel_fd == -1)
1055 w = write (poll_cancel_fd, &counter, sizeof (counter));
1056 if (w < sizeof (counter))
1057 return MEMIF_ERR_INT_WRITE;
1063 memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
1067 memif_msg_queue_free (lm, &(*e)->next);
1073 /* send disconnect msg and close interface */
1075 memif_disconnect_internal (memif_connection_t * c)
1079 DBG ("no connection");
1080 return MEMIF_ERR_NOCONN;
1083 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1085 libmemif_main_t *lm = &libmemif_main;
1086 memif_list_elt_t *e;
1088 c->on_disconnect ((void *) c, c->private_ctx);
1092 memif_msg_send_disconnect (c->fd, (uint8_t *) "interface deleted", 0);
1093 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1096 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1099 if (c->args.is_master)
1100 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1101 e->key = c->fd = -1;
1104 if (c->tx_queues != NULL)
1107 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1109 for (i = 0; i < num; i++)
1111 mq = &c->tx_queues[i];
1116 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1121 lm->free (c->tx_queues);
1122 c->tx_queues = NULL;
1125 if (c->rx_queues != NULL)
1128 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1130 for (i = 0; i < num; i++)
1132 mq = &c->rx_queues[i];
1137 if (c->on_interrupt != NULL)
1138 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1141 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1146 lm->free (c->rx_queues);
1147 c->rx_queues = NULL;
1150 if (c->regions != NULL)
1152 if (munmap (c->regions[0].shm, c->regions[0].region_size) < 0)
1153 return memif_syscall_error_handler (errno);
1154 if (c->regions[0].fd > 0)
1155 close (c->regions[0].fd);
1156 c->regions[0].fd = -1;
1157 lm->free (c->regions);
1161 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1163 memif_msg_queue_free (lm, &c->msg_queue);
1165 if (!(c->args.is_master))
1167 if (lm->disconn_slaves == 0)
1169 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1171 err = memif_syscall_error_handler (errno);
1172 DBG ("timerfd_settime: arm");
1175 lm->disconn_slaves++;
1182 memif_delete (memif_conn_handle_t * conn)
1184 memif_connection_t *c = (memif_connection_t *) * conn;
1187 DBG ("no connection");
1188 return MEMIF_ERR_NOCONN;
1190 libmemif_main_t *lm = &libmemif_main;
1191 memif_list_elt_t *e = NULL;
1192 memif_socket_t *ms = NULL;
1194 int err = MEMIF_ERR_SUCCESS;
1198 DBG ("DISCONNECTING");
1199 err = memif_disconnect_internal (c);
1200 if (err == MEMIF_ERR_NOCONN)
1204 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1206 if (c->args.is_master)
1208 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1212 ms = (memif_socket_t *) e->data_struct;
1214 free_list_elt (ms->interface_list, ms->interface_list_len,
1215 c->args.interface_id);
1216 if (ms->use_count <= 0)
1218 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1219 free_list_elt (lm->listener_list, lm->listener_list_len,
1221 close (c->listener_fd);
1222 c->listener_fd = ms->fd = -1;
1223 lm->free (ms->interface_list);
1224 ms->interface_list = NULL;
1225 lm->free (ms->filename);
1226 ms->filename = NULL;
1234 lm->disconn_slaves--;
1235 if (lm->disconn_slaves <= 0)
1237 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1239 err = memif_syscall_error_handler (errno);
1240 DBG ("timerfd_settime: disarm");
1245 if (c->args.socket_filename)
1246 lm->free (c->args.socket_filename);
1247 c->args.socket_filename = NULL;
1257 memif_connect1 (memif_connection_t * c)
1259 libmemif_main_t *lm = &libmemif_main;
1260 memif_region_t *mr = c->regions;
1270 return MEMIF_ERR_NO_SHMFD;
1272 if ((mr->shm = mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1273 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1275 return memif_syscall_error_handler (errno);
1281 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1283 for (i = 0; i < num; i++)
1285 mq = &c->tx_queues[i];
1288 mq->ring = c->regions[mq->region].shm + mq->offset;
1289 if (mq->ring->cookie != MEMIF_COOKIE)
1291 DBG ("wrong cookie on tx ring %u", i);
1292 return MEMIF_ERR_COOKIE;
1294 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1299 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1301 for (i = 0; i < num; i++)
1303 mq = &c->rx_queues[i];
1306 mq->ring = c->regions[mq->region].shm + mq->offset;
1307 if (mq->ring->cookie != MEMIF_COOKIE)
1309 DBG ("wrong cookie on rx ring %u", i);
1310 return MEMIF_ERR_COOKIE;
1312 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1317 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1323 memif_init_regions_and_queues (memif_connection_t * conn)
1325 memif_ring_t *ring = NULL;
1328 libmemif_main_t *lm = &libmemif_main;
1331 conn->regions = (memif_region_t *) lm->alloc (sizeof (memif_region_t));
1332 if (conn->regions == NULL)
1333 return MEMIF_ERR_NOMEM;
1337 (conn->run_args.num_s2m_rings +
1338 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1339 sizeof (memif_desc_t) *
1340 (1 << conn->run_args.log2_ring_size));
1342 r->region_size = r->buffer_offset +
1343 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1344 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1347 memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1348 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1349 return memif_syscall_error_handler (errno);
1351 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1352 return memif_syscall_error_handler (errno);
1354 if ((ftruncate (r->fd, r->region_size)) == -1)
1355 return memif_syscall_error_handler (errno);
1357 if ((r->shm = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1358 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1359 return memif_syscall_error_handler (errno);
1361 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1363 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1364 DBG ("RING: %p I: %d", ring, i);
1365 ring->head = ring->tail = 0;
1366 ring->cookie = MEMIF_COOKIE;
1368 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1370 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1371 ring->desc[j].region = 0;
1372 ring->desc[j].offset = r->buffer_offset +
1373 (uint32_t) (slot * conn->run_args.buffer_size);
1374 ring->desc[j].length = conn->run_args.buffer_size;
1377 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1379 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1380 DBG ("RING: %p I: %d", ring, i);
1381 ring->head = ring->tail = 0;
1382 ring->cookie = MEMIF_COOKIE;
1384 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1388 conn->run_args.num_s2m_rings) *
1389 (1 << conn->run_args.log2_ring_size) + j;
1390 ring->desc[j].region = 0;
1391 ring->desc[j].offset = r->buffer_offset +
1392 (uint32_t) (slot * conn->run_args.buffer_size);
1393 ring->desc[j].length = conn->run_args.buffer_size;
1398 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1399 conn->run_args.num_s2m_rings);
1401 return MEMIF_ERR_NOMEM;
1403 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1405 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1406 return memif_syscall_error_handler (errno);
1407 /* add int fd to interrupt fd list */
1408 e.key = mq[x].int_fd;
1409 e.data_struct = conn;
1410 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1412 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1413 DBG ("RING: %p I: %d", mq[x].ring, x);
1414 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1417 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1418 mq[x].last_head = 0;
1419 mq[x].alloc_bufs = 0;
1421 conn->tx_queues = mq;
1424 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1425 conn->run_args.num_m2s_rings);
1427 return MEMIF_ERR_NOMEM;
1428 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1430 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1431 return memif_syscall_error_handler (errno);
1432 /* add int fd to interrupt fd list */
1433 e.key = mq[x].int_fd;
1434 e.data_struct = conn;
1435 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1437 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1438 DBG ("RING: %p I: %d", mq[x].ring, x);
1439 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1442 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1443 mq[x].last_head = 0;
1444 mq[x].alloc_bufs = 0;
1446 conn->rx_queues = mq;
1452 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1453 memif_buffer_t * bufs, uint16_t count,
1454 uint16_t * count_out)
1456 memif_connection_t *c = (memif_connection_t *) conn;
1457 if (EXPECT_FALSE (c == NULL))
1458 return MEMIF_ERR_NOCONN;
1459 if (EXPECT_FALSE (c->fd < 0))
1460 return MEMIF_ERR_DISCONNECTED;
1462 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1464 if (EXPECT_FALSE (qid >= num))
1465 return MEMIF_ERR_QID;
1466 if (EXPECT_FALSE (!count_out))
1467 return MEMIF_ERR_INVAL_ARG;
1468 if (EXPECT_FALSE (c->args.is_master))
1469 return MEMIF_ERR_INVAL_ARG;
1471 memif_queue_t *mq = &c->tx_queues[qid];
1472 memif_ring_t *ring = mq->ring;
1474 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1477 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1480 ring_size = (1 << mq->log2_ring_size);
1481 ns = ring->tail - mq->last_tail;
1482 mq->last_tail += ns;
1483 slot = (c->args.is_master) ? ring->tail : ring->head;
1484 slot += mq->alloc_bufs;
1486 /* can only be called by slave */
1487 ns = ring_size - ring->head + mq->alloc_bufs + mq->last_tail;
1493 if (EXPECT_FALSE ((b0->flags & MEMIF_BUFFER_FLAG_RX) == 0))
1495 /* not a valid buffer */
1499 b0->flags &= ~MEMIF_BUFFER_FLAG_RX;
1501 ((memif_ring_t *) b0->ring)->desc[b0->desc_index & mask].offset = ring->desc[slot & mask].offset; /* put free buffer on rx ring */
1503 ring->desc[slot & mask].offset =
1504 (uint32_t) (b0->data - c->regions->shm);
1505 ring->desc[slot & mask].flags |=
1506 (b0->flags & MEMIF_BUFFER_FLAG_NEXT) ? MEMIF_DESC_FLAG_NEXT : 0;
1508 b0->desc_index = slot;
1519 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1524 DBG ("ring buffer full! qid: %u", qid);
1525 err = MEMIF_ERR_NOBUF_RING;
1533 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1534 memif_buffer_t * bufs, uint16_t count,
1535 uint16_t * count_out, uint16_t size)
1537 memif_connection_t *c = (memif_connection_t *) conn;
1538 if (EXPECT_FALSE (c == NULL))
1539 return MEMIF_ERR_NOCONN;
1540 if (EXPECT_FALSE (c->fd < 0))
1541 return MEMIF_ERR_DISCONNECTED;
1543 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1545 if (EXPECT_FALSE (qid >= num))
1546 return MEMIF_ERR_QID;
1547 if (EXPECT_FALSE (!count_out))
1548 return MEMIF_ERR_INVAL_ARG;
1550 memif_queue_t *mq = &c->tx_queues[qid];
1551 memif_ring_t *ring = mq->ring;
1552 memif_buffer_t *b0, *b1;
1553 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1556 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1557 uint16_t dst_left, src_left;
1558 uint16_t saved_count;
1559 memif_buffer_t *saved_b;
1562 ring_size = (1 << mq->log2_ring_size);
1563 ns = ring->tail - mq->last_tail;
1564 mq->last_tail += ns;
1565 slot = (c->args.is_master) ? ring->tail : ring->head;
1566 slot += mq->alloc_bufs;
1568 if (c->args.is_master)
1569 ns = ring->head + mq->alloc_bufs - ring->tail;
1571 ns = ring_size - ring->head + mq->alloc_bufs + mq->last_tail;
1575 b0 = (bufs + *count_out);
1578 saved_count = count;
1580 b0->desc_index = slot;
1581 ring->desc[slot & mask].flags = 0;
1583 /* slave can produce buffer with original length */
1584 dst_left = (c->args.is_master) ? ring->desc[slot & mask].length :
1585 c->run_args.buffer_size;
1590 if (EXPECT_FALSE (dst_left == 0))
1600 ring->desc[b0->desc_index & mask].flags |=
1601 MEMIF_DESC_FLAG_NEXT;
1602 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1604 b0 = (bufs + *count_out);
1605 b0->desc_index = slot;
1607 (c->args.is_master) ? ring->desc[slot & mask].length : c->
1608 run_args.buffer_size;
1609 ring->desc[slot & mask].flags = 0;
1613 /* rollback allocated chain buffers */
1614 memset (saved_b, 0, sizeof (memif_buffer_t)
1615 * (saved_count - count + 1));
1616 *count_out -= saved_count - count;
1617 mq->alloc_bufs = saved_count - count;
1621 b0->len = memif_min (dst_left, src_left);
1623 /* slave resets buffer offset */
1624 if (c->args.is_master == 0)
1627 (ring->desc[slot & mask].offset -
1628 c->regions->buffer_offset) / c->run_args.buffer_size;
1629 ring->desc[slot & mask].offset =
1630 c->regions->buffer_offset + (x * c->run_args.buffer_size);
1633 b0->data = c->regions->shm + ring->desc[slot & mask].offset;
1635 src_left -= b0->len;
1636 dst_left -= b0->len;
1648 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1653 DBG ("ring buffer full! qid: %u", qid);
1654 err = MEMIF_ERR_NOBUF_RING;
1662 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1665 memif_connection_t *c = (memif_connection_t *) conn;
1666 if (EXPECT_FALSE (c == NULL))
1667 return MEMIF_ERR_NOCONN;
1668 if (EXPECT_FALSE (c->fd < 0))
1669 return MEMIF_ERR_DISCONNECTED;
1671 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1673 if (EXPECT_FALSE (qid >= num))
1674 return MEMIF_ERR_QID;
1675 libmemif_main_t *lm = &libmemif_main;
1676 memif_queue_t *mq = &c->rx_queues[qid];
1677 memif_ring_t *ring = mq->ring;
1678 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1681 if (c->args.is_master)
1683 MEMIF_MEMORY_BARRIER ();
1685 (ring->tail + count <=
1686 mq->last_head) ? ring->tail + count : mq->last_head;
1687 return MEMIF_ERR_SUCCESS;
1690 uint16_t head = ring->head;
1691 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1692 head += (count < ns) ? count : ns;
1696 slot = (c->args.is_master) ? ring->head : ring->tail;
1700 (ring->desc[slot & mask].offset -
1701 c->regions->buffer_offset) / c->run_args.buffer_size;
1702 ring->desc[slot & mask].offset =
1703 c->regions->buffer_offset + (x * c->run_args.buffer_size) +
1710 MEMIF_MEMORY_BARRIER ();
1713 return MEMIF_ERR_SUCCESS; /* 0 */
1717 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1718 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1720 memif_connection_t *c = (memif_connection_t *) conn;
1721 if (EXPECT_FALSE (c == NULL))
1722 return MEMIF_ERR_NOCONN;
1723 if (EXPECT_FALSE (c->fd < 0))
1724 return MEMIF_ERR_DISCONNECTED;
1726 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1728 if (EXPECT_FALSE (qid >= num))
1729 return MEMIF_ERR_QID;
1730 if (EXPECT_FALSE (!tx))
1731 return MEMIF_ERR_INVAL_ARG;
1733 memif_queue_t *mq = &c->tx_queues[qid];
1734 memif_ring_t *ring = mq->ring;
1735 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1739 if (count > mq->alloc_bufs)
1740 count = mq->alloc_bufs;
1742 if (EXPECT_FALSE (count == 0))
1743 return MEMIF_ERR_SUCCESS;
1748 ring->desc[b0->desc_index & mask].length = b0->len;
1750 #ifdef MEMIF_DBG_SHM
1751 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1752 printf ("data: %p\n",
1753 memif_get_buffer (c, ring, b0->desc_index & mask));
1754 printf ("index: %u\n", b0->desc_index);
1755 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1756 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1757 #endif /* MEMIF_DBG_SHM */
1764 MEMIF_MEMORY_BARRIER ();
1765 if (c->args.is_master)
1766 ring->tail = b0->desc_index + 1;
1768 ring->head = b0->desc_index + 1;
1770 mq->alloc_bufs -= *tx;
1772 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1775 int r = write (mq->int_fd, &a, sizeof (a));
1777 return MEMIF_ERR_INT_WRITE;
1780 return MEMIF_ERR_SUCCESS; /* 0 */
1784 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1785 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1787 memif_connection_t *c = (memif_connection_t *) conn;
1788 if (EXPECT_FALSE (c == NULL))
1789 return MEMIF_ERR_NOCONN;
1790 if (EXPECT_FALSE (c->fd < 0))
1791 return MEMIF_ERR_DISCONNECTED;
1793 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1795 if (EXPECT_FALSE (qid >= num))
1796 return MEMIF_ERR_QID;
1797 if (EXPECT_FALSE (!rx))
1798 return MEMIF_ERR_INVAL_ARG;
1800 memif_queue_t *mq = &c->rx_queues[qid];
1801 memif_ring_t *ring = mq->ring;
1802 uint16_t cur_slot, last_slot;
1804 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1805 memif_buffer_t *b0, *b1;
1809 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1810 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1811 return memif_syscall_error_handler (errno);
1813 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1814 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1815 if (cur_slot == last_slot)
1816 return MEMIF_ERR_SUCCESS;
1818 ns = last_slot - cur_slot;
1824 b0->desc_index = cur_slot;
1825 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1826 b0->len = ring->desc[cur_slot & mask].length;
1827 /* slave resets buffer length */
1828 if (c->args.is_master == 0)
1830 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1833 b0->flags = MEMIF_BUFFER_FLAG_RX;
1834 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1836 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1837 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1839 /* b0->offset = ring->desc[cur_slot & mask].offset;*/
1841 #ifdef MEMIF_DBG_SHM
1842 printf ("data: %p\n", b0->data);
1843 printf ("index: %u\n", b0->desc_index);
1844 printf ("ring: %p\n", b0->ring);
1845 print_bytes (b0->data, b0->len, DBG_RX_BUF);
1846 #endif /* MEMIF_DBG_SHM */
1854 if (c->args.is_master)
1855 mq->last_head = cur_slot;
1857 mq->last_tail = cur_slot;
1861 DBG ("not enough buffers!");
1862 return MEMIF_ERR_NOBUF;
1865 return MEMIF_ERR_SUCCESS; /* 0 */
1869 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1870 char *buf, ssize_t buflen)
1872 libmemif_main_t *lm = &libmemif_main;
1873 memif_connection_t *c = (memif_connection_t *) conn;
1875 return MEMIF_ERR_NOCONN;
1877 int err = MEMIF_ERR_SUCCESS, i;
1878 ssize_t l0, l1, total_l;
1881 l1 = strlen ((char *) c->args.interface_name);
1882 if (l0 + l1 < buflen)
1884 md->if_name = (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
1888 err = MEMIF_ERR_NOBUF_DET;
1890 l1 = strlen ((char *) lm->app_name);
1891 if (l0 + l1 < buflen)
1893 md->inst_name = (uint8_t *) strcpy (buf + l0, (char *) lm->app_name);
1897 err = MEMIF_ERR_NOBUF_DET;
1899 l1 = strlen ((char *) c->remote_if_name);
1900 if (l0 + l1 < buflen)
1902 md->remote_if_name = (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
1906 err = MEMIF_ERR_NOBUF_DET;
1908 l1 = strlen ((char *) c->remote_name);
1909 if (l0 + l1 < buflen)
1911 md->remote_inst_name = (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
1915 err = MEMIF_ERR_NOBUF_DET;
1917 md->id = c->args.interface_id;
1919 if (strlen((char *) c->args.secret) > 0)
1921 l1 = strlen ((char *) c->args.secret);
1922 if (l0 + l1 < buflen)
1924 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
1928 err = MEMIF_ERR_NOBUF_DET;
1931 md->role = (c->args.is_master) ? 0 : 1;
1932 md->mode = c->args.mode;
1934 l1 = strlen ((char *) c->args.socket_filename);
1935 if (l0 + l1 < buflen)
1937 md->socket_filename =
1938 (uint8_t *) strcpy (buf + l0, (char *) c->args.socket_filename);
1942 err = MEMIF_ERR_NOBUF_DET;
1945 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1948 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
1949 if (l0 + l1 <= buflen)
1951 md->rx_queues = (memif_queue_details_t *) buf + l0;
1955 err = MEMIF_ERR_NOBUF_DET;
1957 for (i = 0; i < md->rx_queues_num; i++)
1959 md->rx_queues[i].qid = i;
1960 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
1961 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
1962 md->rx_queues[i].head = c->rx_queues[i].ring->head;
1963 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
1964 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
1968 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1971 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
1972 if (l0 + l1 <= buflen)
1974 md->tx_queues = (memif_queue_details_t *) buf + l0;
1978 err = MEMIF_ERR_NOBUF_DET;
1980 for (i = 0; i < md->tx_queues_num; i++)
1982 md->tx_queues[i].qid = i;
1983 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
1984 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
1985 md->tx_queues[i].head = c->tx_queues[i].ring->head;
1986 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
1987 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
1990 md->link_up_down = (c->fd > 0) ? 1 : 0;
1996 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
1998 memif_connection_t *c = (memif_connection_t *) conn;
2001 return MEMIF_ERR_NOCONN;
2003 return MEMIF_ERR_DISCONNECTED;
2005 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
2008 return MEMIF_ERR_QID;
2010 *efd = c->rx_queues[qid].int_fd;
2012 return MEMIF_ERR_SUCCESS;
2018 libmemif_main_t *lm = &libmemif_main;
2019 if (lm->control_list)
2020 lm->free (lm->control_list);
2021 lm->control_list = NULL;
2022 if (lm->interrupt_list)
2023 lm->free (lm->interrupt_list);
2024 lm->interrupt_list = NULL;
2025 if (lm->listener_list)
2026 lm->free (lm->listener_list);
2027 lm->listener_list = NULL;
2028 if (lm->pending_list)
2029 lm->free (lm->pending_list);
2030 lm->pending_list = NULL;
2031 if (poll_cancel_fd != -1)
2032 close (poll_cancel_fd);
2034 return MEMIF_ERR_SUCCESS; /* 0 */