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 38
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"
150 #define MEMIF_ERR_UNDEFINED "undefined error"
153 memif_strerror (int err_code)
155 if (err_code >= ERRLIST_LEN)
157 strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED));
158 memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0';
162 strncpy (memif_buf, memif_errlist[err_code],
163 strlen (memif_errlist[err_code]));
164 memif_buf[strlen (memif_errlist[err_code])] = '\0';
169 #define DBG_TX_BUF (0)
170 #define DBG_RX_BUF (1)
174 print_bytes (void *data, uint16_t len, uint8_t q)
177 printf ("\nTX:\n\t");
179 printf ("\nRX:\n\t");
181 for (i = 0; i < len; i++)
184 printf ("\n%d:\t", i);
185 printf ("%02X ", ((uint8_t *) (data))[i]);
189 #endif /* MEMIF_DBG_SHM */
192 memif_syscall_error_handler (int err_code)
194 DBG_UNIX ("%s", strerror (err_code));
197 return MEMIF_ERR_SUCCESS;
198 if (err_code == EACCES)
199 return MEMIF_ERR_ACCES;
200 if (err_code == ENFILE)
201 return MEMIF_ERR_FILE_LIMIT;
202 if (err_code == EMFILE)
203 return MEMIF_ERR_PROC_FILE_LIMIT;
204 if (err_code == ENOMEM)
205 return MEMIF_ERR_NOMEM;
206 /* connection refused if master does not exist
207 this error would spam the user until master was created */
208 if (err_code == ECONNREFUSED)
209 return MEMIF_ERR_SUCCESS;
210 if (err_code == EALREADY)
211 return MEMIF_ERR_ALREADY;
212 if (err_code == EAGAIN)
213 return MEMIF_ERR_AGAIN;
214 if (err_code == EBADF)
215 return MEMIF_ERR_BAD_FD;
216 if (err_code == ENOENT)
217 return MEMIF_ERR_NO_FILE;
219 /* other syscall errors */
220 return MEMIF_ERR_SYSCALL;
224 memif_add_epoll_fd (int fd, uint32_t events)
228 DBG ("invalid fd %d", fd);
231 struct epoll_event evt;
232 memset (&evt, 0, sizeof (evt));
235 if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
237 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
240 DBG ("fd %d added to epoll", fd);
245 memif_mod_epoll_fd (int fd, uint32_t events)
249 DBG ("invalid fd %d", fd);
252 struct epoll_event evt;
253 memset (&evt, 0, sizeof (evt));
256 if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
258 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
261 DBG ("fd %d moddified on epoll", fd);
266 memif_del_epoll_fd (int fd)
270 DBG ("invalid fd %d", fd);
273 struct epoll_event evt;
274 memset (&evt, 0, sizeof (evt));
275 if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
277 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
280 DBG ("fd %d removed from epoll", fd);
285 memif_control_fd_update (int fd, uint8_t events)
287 if (events & MEMIF_FD_EVENT_DEL)
288 return memif_del_epoll_fd (fd);
291 if (events & MEMIF_FD_EVENT_READ)
293 if (events & MEMIF_FD_EVENT_WRITE)
296 if (events & MEMIF_FD_EVENT_MOD)
297 return memif_mod_epoll_fd (fd, evt);
299 return memif_add_epoll_fd (fd, evt);
303 add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
305 libmemif_main_t *lm = &libmemif_main;
308 for (i = 0; i < *len; i++)
310 if ((*list)[i].data_struct == NULL)
312 (*list)[i].key = e->key;
313 (*list)[i].data_struct = e->data_struct;
317 memif_list_elt_t *tmp;
318 tmp = realloc (*list, sizeof (memif_list_elt_t) * *len * 2);
322 for (i = *len; i < *len * 2; i++)
325 tmp[i].data_struct = NULL;
328 tmp[*len].key = e->key;
329 tmp[*len].data_struct = e->data_struct;
338 get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len,
347 for (i = 0; i < len; i++)
349 if (list[i].key == key)
359 /* does not free memory, only marks element as free */
361 free_list_elt (memif_list_elt_t * list, uint16_t len, int key)
364 for (i = 0; i < len; i++)
366 if (list[i].key == key)
369 list[i].data_struct = NULL;
378 free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
379 memif_connection_t * ctx)
382 for (i = 0; i < len; i++)
384 if (list[i].key == -1)
386 if (list[i].data_struct == ctx)
388 list[i].data_struct = NULL;
398 memif_control_fd_update_register (memif_control_fd_update_t * cb)
400 libmemif_main_t *lm = &libmemif_main;
401 lm->control_fd_update = cb;
405 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name)
407 int err = MEMIF_ERR_SUCCESS; /* 0 */
408 libmemif_main_t *lm = &libmemif_main;
412 lm->app_name = malloc (strlen (app_name) + sizeof (char));
413 memset (lm->app_name, 0, strlen (app_name) + sizeof (char));
414 strncpy ((char *) lm->app_name, app_name, strlen (app_name));
418 lm->app_name = malloc (strlen (MEMIF_DEFAULT_APP_NAME) + sizeof (char));
419 memset (lm->app_name, 0, strlen (app_name) + sizeof (char));
420 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
421 strlen (MEMIF_DEFAULT_APP_NAME));
424 /* register control fd update callback */
425 if (on_control_fd_update != NULL)
426 memif_control_fd_update_register (on_control_fd_update);
429 memif_epfd = epoll_create (1);
430 memif_control_fd_update_register (memif_control_fd_update);
431 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
434 DBG ("eventfd: %s", strerror (err));
435 return memif_syscall_error_handler (err);
437 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ);
438 DBG ("libmemif event polling initialized");
441 memset (&lm->ms, 0, sizeof (memif_socket_t));
443 lm->control_list_len = 2;
444 lm->interrupt_list_len = 2;
445 lm->listener_list_len = 1;
446 lm->pending_list_len = 1;
449 malloc (sizeof (memif_list_elt_t) * lm->control_list_len);
451 malloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
453 malloc (sizeof (memif_list_elt_t) * lm->listener_list_len);
455 malloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
458 for (i = 0; i < lm->control_list_len; i++)
460 lm->control_list[i].key = -1;
461 lm->control_list[i].data_struct = NULL;
463 for (i = 0; i < lm->interrupt_list_len; i++)
465 lm->interrupt_list[i].key = -1;
466 lm->interrupt_list[i].data_struct = NULL;
468 for (i = 0; i < lm->listener_list_len; i++)
470 lm->listener_list[i].key = -1;
471 lm->listener_list[i].data_struct = NULL;
473 for (i = 0; i < lm->pending_list_len; i++)
475 lm->pending_list[i].key = -1;
476 lm->pending_list[i].data_struct = NULL;
479 lm->disconn_slaves = 0;
481 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
485 DBG ("timerfd: %s", strerror (err));
486 return memif_syscall_error_handler (err);
489 lm->arm.it_value.tv_sec = 2;
490 lm->arm.it_value.tv_nsec = 0;
491 lm->arm.it_interval.tv_sec = 2;
492 lm->arm.it_interval.tv_nsec = 0;
493 memset (&lm->disarm, 0, sizeof (lm->disarm));
495 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
497 DBG ("callback type memif_control_fd_update_t error!");
498 return MEMIF_ERR_CB_FDUPDATE;
504 static inline memif_ring_t *
505 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
508 if (&conn->regions[0] == NULL)
510 void *p = conn->regions[0].shm;
512 sizeof (memif_ring_t) +
513 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
514 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
516 return (memif_ring_t *) p;
520 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
523 memif_connection_t *conn = (memif_connection_t *) c;
525 return MEMIF_ERR_NOCONN;
527 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->
528 run_args.num_m2s_rings;
530 return MEMIF_ERR_QID;
532 conn->rx_queues[qid].ring->flags = rx_mode;
533 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
534 return MEMIF_ERR_SUCCESS;
538 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
539 memif_connection_update_t * on_connect,
540 memif_connection_update_t * on_disconnect,
541 memif_interrupt_t * on_interrupt, void *private_ctx)
543 int err, i, index, sockfd = -1;
544 memif_list_elt_t list_elt;
545 memif_connection_t *conn = (memif_connection_t *) * c;
548 DBG ("This handle already points to existing memif.");
549 return MEMIF_ERR_CONN;
551 conn = (memif_connection_t *) malloc (sizeof (memif_connection_t));
554 err = memif_syscall_error_handler (errno);
557 memset (conn, 0, sizeof (memif_connection_t));
559 libmemif_main_t *lm = &libmemif_main;
561 conn->args.interface_id = args->interface_id;
563 if (args->log2_ring_size == 0)
564 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
565 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
567 err = MEMIF_ERR_MAX_RING;
570 if (args->buffer_size == 0)
571 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
572 if (args->num_s2m_rings == 0)
573 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
574 if (args->num_m2s_rings == 0)
575 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
577 conn->args.num_s2m_rings = args->num_s2m_rings;
578 conn->args.num_m2s_rings = args->num_m2s_rings;
579 conn->args.buffer_size = args->buffer_size;
580 conn->args.log2_ring_size = args->log2_ring_size;
581 conn->args.is_master = args->is_master;
582 conn->args.mode = args->mode;
583 conn->msg_queue = NULL;
584 conn->regions = NULL;
585 conn->tx_queues = NULL;
586 conn->rx_queues = NULL;
588 conn->on_connect = on_connect;
589 conn->on_disconnect = on_disconnect;
590 conn->on_interrupt = on_interrupt;
591 conn->private_ctx = private_ctx;
592 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
594 uint8_t l = strlen ((char *) args->interface_name);
595 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
598 l = strlen ((char *) args->instance_name);
599 strncpy ((char *) conn->args.instance_name, (char *) args->instance_name,
602 /* allocate and initialize socket_filename so it can be copyed to sun_path
603 without memory leaks */
604 conn->args.socket_filename = malloc (sizeof (char *) * 108);
605 memset (conn->args.socket_filename, 0, 108 * sizeof (char *));
607 if (args->socket_filename)
609 if (conn->args.socket_filename == NULL)
611 err = memif_syscall_error_handler (errno);
614 strncpy ((char *) conn->args.socket_filename,
615 (char *) args->socket_filename,
616 strlen ((char *) args->socket_filename));
620 uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR);
621 uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME);
622 if (conn->args.socket_filename == NULL)
624 err = memif_syscall_error_handler (errno);
627 strncpy ((char *) conn->args.socket_filename,
628 MEMIF_DEFAULT_SOCKET_DIR, sdl);
629 conn->args.socket_filename[sdl] = '/';
630 strncpy ((char *) (conn->args.socket_filename + 1 + sdl),
631 MEMIF_DEFAULT_SOCKET_FILENAME, sfl);
636 l = strlen ((char *) args->secret);
637 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
640 if (conn->args.is_master)
642 conn->run_args.buffer_size = conn->args.buffer_size;
644 memif_list_elt_t elt;
645 for (i = 0; i < lm->listener_list_len; i++)
648 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
651 ((char *) ms->filename, (char *) conn->args.socket_filename,
652 strlen ((char *) ms->filename)) == 0)
654 /* add interface to listener socket */
655 elt.key = conn->args.interface_id;
656 *c = elt.data_struct = conn;
657 add_list_elt (&elt, &ms->interface_list,
658 &ms->interface_list_len);
660 conn->listener_fd = ms->fd;
666 struct stat file_stat;
667 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
669 if (S_ISSOCK (file_stat.st_mode))
670 unlink ((char *) conn->args.socket_filename);
672 return memif_syscall_error_handler (errno);
674 DBG ("creating socket file");
675 ms = malloc (sizeof (memif_socket_t));
677 malloc (strlen ((char *) conn->args.socket_filename) +
679 memset (ms->filename, 0,
680 strlen ((char *) conn->args.socket_filename) +
682 strncpy ((char *) ms->filename,
683 (char *) conn->args.socket_filename,
684 strlen ((char *) conn->args.socket_filename));
685 ms->interface_list_len = 1;
687 malloc (sizeof (memif_list_elt_t) * ms->interface_list_len);
688 ms->interface_list[0].key = -1;
689 ms->interface_list[0].data_struct = NULL;
690 struct sockaddr_un un = { 0 };
693 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
696 err = memif_syscall_error_handler (errno);
699 DBG ("socket %d created", ms->fd);
700 un.sun_family = AF_UNIX;
701 strncpy ((char *) un.sun_path, (char *) ms->filename,
702 sizeof (un.sun_path) - 1);
705 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
707 err = memif_syscall_error_handler (errno);
711 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
713 err = memif_syscall_error_handler (errno);
717 if (listen (ms->fd, 1) < 0)
719 err = memif_syscall_error_handler (errno);
723 if (stat ((char *) ms->filename, &file_stat) < 0)
725 err = memif_syscall_error_handler (errno);
729 /* add interface to listener socket */
730 elt.key = conn->args.interface_id;
731 *c = elt.data_struct = conn;
732 add_list_elt (&elt, &ms->interface_list,
733 &ms->interface_list_len);
735 conn->listener_fd = ms->fd;
737 /* add listener socket to libmemif main */
739 elt.data_struct = ms;
740 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
741 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
748 if (lm->disconn_slaves == 0)
750 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
752 err = memif_syscall_error_handler (errno);
757 lm->disconn_slaves++;
760 *c = list_elt.data_struct = conn;
762 add_list_elt (&list_elt, &lm->control_list,
763 &lm->control_list_len)) < 0)
765 err = MEMIF_ERR_NOMEM;
778 if (conn->args.socket_filename)
779 free (conn->args.socket_filename);
787 memif_control_fd_handler (int fd, uint8_t events)
789 int i, rv, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */
791 memif_list_elt_t *e = NULL;
792 memif_connection_t *conn;
793 libmemif_main_t *lm = &libmemif_main;
794 if (fd == lm->timerfd)
798 size = read (fd, &b, sizeof (b));
799 for (i = 0; i < lm->control_list_len; i++)
801 if ((lm->control_list[i].key < 0)
802 && (lm->control_list[i].data_struct != NULL))
804 conn = lm->control_list[i].data_struct;
805 if (conn->args.is_master)
808 struct sockaddr_un sun;
809 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
812 err = memif_syscall_error_handler (errno);
816 sun.sun_family = AF_UNIX;
818 strncpy (sun.sun_path, conn->args.socket_filename,
819 sizeof (sun.sun_path) - 1);
821 if (connect (sockfd, (struct sockaddr *) &sun,
822 sizeof (struct sockaddr_un)) == 0)
825 conn->read_fn = memif_conn_fd_read_ready;
826 conn->write_fn = memif_conn_fd_write_ready;
827 conn->error_fn = memif_conn_fd_error;
829 lm->control_list[conn->index].key = conn->fd;
831 lm->control_fd_update (sockfd,
832 MEMIF_FD_EVENT_READ |
833 MEMIF_FD_EVENT_WRITE);
835 lm->disconn_slaves--;
836 if (lm->disconn_slaves == 0)
838 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL)
841 err = memif_syscall_error_handler (errno);
848 err = memif_syscall_error_handler (errno);
856 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
859 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
862 (((memif_connection_t *) e->data_struct)->
863 args.is_master) ? ((memif_connection_t *) e->
864 data_struct)->run_args.
865 num_s2m_rings : ((memif_connection_t *) e->data_struct)->
866 run_args.num_m2s_rings;
867 for (i = 0; i < num; i++)
869 if (((memif_connection_t *) e->data_struct)->
870 rx_queues[i].int_fd == fd)
872 ((memif_connection_t *) e->data_struct)->
873 on_interrupt ((void *) e->data_struct,
874 ((memif_connection_t *) e->
875 data_struct)->private_ctx, i);
876 return MEMIF_ERR_SUCCESS;
880 return MEMIF_ERR_SUCCESS;
882 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
885 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
886 return MEMIF_ERR_SUCCESS;
889 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
892 memif_read_ready (fd);
893 return MEMIF_ERR_SUCCESS;
896 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
899 if (events & MEMIF_FD_EVENT_READ)
902 ((memif_connection_t *) e->data_struct)->
903 read_fn (e->data_struct);
904 if (err != MEMIF_ERR_SUCCESS)
907 if (events & MEMIF_FD_EVENT_WRITE)
910 ((memif_connection_t *) e->data_struct)->
911 write_fn (e->data_struct);
912 if (err != MEMIF_ERR_SUCCESS)
915 if (events & MEMIF_FD_EVENT_ERROR)
918 ((memif_connection_t *) e->data_struct)->
919 error_fn (e->data_struct);
920 if (err != MEMIF_ERR_SUCCESS)
926 return MEMIF_ERR_SUCCESS; /* 0 */
936 memif_poll_event (int timeout)
938 libmemif_main_t *lm = &libmemif_main;
939 memif_list_elt_t *elt;
940 struct epoll_event evt, *e;
941 int en = 0, err = MEMIF_ERR_SUCCESS, i = 0; /* 0 */
944 uint64_t counter = 0;
946 memset (&evt, 0, sizeof (evt));
947 evt.events = EPOLLIN | EPOLLOUT;
949 sigemptyset (&sigset);
950 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
954 DBG ("epoll_pwait: %s", strerror (err));
955 return memif_syscall_error_handler (err);
959 if (evt.data.fd == poll_cancel_fd)
961 r = read (evt.data.fd, &counter, sizeof (counter));
962 return MEMIF_ERR_POLL_CANCEL;
964 if (evt.events & EPOLLIN)
965 events |= MEMIF_FD_EVENT_READ;
966 if (evt.events & EPOLLOUT)
967 events |= MEMIF_FD_EVENT_WRITE;
968 if (evt.events & EPOLLERR)
969 events |= MEMIF_FD_EVENT_ERROR;
970 err = memif_control_fd_handler (evt.data.fd, events);
977 memif_cancel_poll_event ()
979 uint64_t counter = 1;
982 if (poll_cancel_fd == -1)
984 w = write (poll_cancel_fd, &counter, sizeof (counter));
985 if (w < sizeof (counter))
986 return MEMIF_ERR_INT_WRITE;
992 memif_msg_queue_free (memif_msg_queue_elt_t ** e)
996 memif_msg_queue_free (&(*e)->next);
1002 /* send disconnect msg and close interface */
1004 memif_disconnect_internal (memif_connection_t * c)
1008 DBG ("no connection");
1009 return MEMIF_ERR_NOCONN;
1012 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1014 libmemif_main_t *lm = &libmemif_main;
1015 memif_list_elt_t *e;
1017 c->on_disconnect ((void *) c, c->private_ctx);
1021 memif_msg_send_disconnect (c->fd, "interface deleted", 0);
1022 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1025 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1028 if (c->args.is_master)
1029 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1030 e->key = c->fd = -1;
1033 if (c->tx_queues != NULL)
1036 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1037 run_args.num_s2m_rings;
1038 for (i = 0; i < num; i++)
1040 mq = &c->tx_queues[i];
1045 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1050 free (c->tx_queues);
1051 c->tx_queues = NULL;
1054 if (c->rx_queues != NULL)
1057 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1058 run_args.num_m2s_rings;
1059 for (i = 0; i < num; i++)
1061 mq = &c->rx_queues[i];
1066 if (c->on_interrupt != NULL)
1067 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1070 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1075 free (c->rx_queues);
1076 c->rx_queues = NULL;
1079 if (c->regions != NULL)
1081 if (munmap (c->regions[0].shm, c->regions[0].region_size) < 0)
1082 return memif_syscall_error_handler (errno);
1083 if (c->regions[0].fd > 0)
1084 close (c->regions[0].fd);
1085 c->regions[0].fd = -1;
1090 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1092 memif_msg_queue_free (&c->msg_queue);
1094 if (!(c->args.is_master))
1096 if (lm->disconn_slaves == 0)
1098 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1100 err = memif_syscall_error_handler (errno);
1101 DBG_UNIX ("timerfd_settime: arm");
1104 lm->disconn_slaves++;
1111 memif_delete (memif_conn_handle_t * conn)
1113 memif_connection_t *c = (memif_connection_t *) * conn;
1116 DBG ("no connection");
1117 return MEMIF_ERR_NOCONN;
1119 libmemif_main_t *lm = &libmemif_main;
1120 memif_list_elt_t *e = NULL;
1121 memif_socket_t *ms = NULL;
1123 int err = MEMIF_ERR_SUCCESS;
1127 DBG ("DISCONNECTING");
1128 err = memif_disconnect_internal (c);
1129 if (err == MEMIF_ERR_NOCONN)
1133 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1135 if (c->args.is_master)
1137 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1141 ms = (memif_socket_t *) e->data_struct;
1143 free_list_elt (ms->interface_list, ms->interface_list_len,
1144 c->args.interface_id);
1145 if (ms->use_count <= 0)
1147 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1148 free_list_elt (lm->listener_list, lm->listener_list_len,
1150 close (c->listener_fd);
1151 c->listener_fd = ms->fd = -1;
1152 free (ms->interface_list);
1153 ms->interface_list = NULL;
1154 free (ms->filename);
1155 ms->filename = NULL;
1163 lm->disconn_slaves--;
1164 if (lm->disconn_slaves <= 0)
1166 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1168 err = memif_syscall_error_handler (errno);
1169 DBG ("timerfd_settime: disarm");
1174 if (c->args.socket_filename)
1175 free (c->args.socket_filename);
1176 c->args.socket_filename = NULL;
1186 memif_connect1 (memif_connection_t * c)
1188 libmemif_main_t *lm = &libmemif_main;
1189 memif_region_t *mr = c->regions;
1199 return MEMIF_ERR_NO_SHMFD;
1201 if ((mr->shm = mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1202 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1204 return memif_syscall_error_handler (errno);
1210 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1211 run_args.num_s2m_rings;
1212 for (i = 0; i < num; i++)
1214 mq = &c->tx_queues[i];
1217 mq->ring = c->regions[mq->region].shm + mq->offset;
1218 if (mq->ring->cookie != MEMIF_COOKIE)
1220 DBG ("wrong cookie on tx ring %u", i);
1221 return MEMIF_ERR_COOKIE;
1223 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1228 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1229 run_args.num_m2s_rings;
1230 for (i = 0; i < num; i++)
1232 mq = &c->rx_queues[i];
1235 mq->ring = c->regions[mq->region].shm + mq->offset;
1236 if (mq->ring->cookie != MEMIF_COOKIE)
1238 DBG ("wrong cookie on rx ring %u", i);
1239 return MEMIF_ERR_COOKIE;
1241 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1246 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1252 memif_init_regions_and_queues (memif_connection_t * conn)
1254 memif_ring_t *ring = NULL;
1255 uint64_t buffer_offset;
1258 libmemif_main_t *lm = &libmemif_main;
1261 conn->regions = (memif_region_t *) malloc (sizeof (memif_region_t));
1262 if (conn->regions == NULL)
1263 return memif_syscall_error_handler (errno);
1267 (conn->run_args.num_s2m_rings +
1268 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1269 sizeof (memif_desc_t) *
1270 (1 << conn->run_args.log2_ring_size));
1272 r->region_size = buffer_offset +
1273 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1274 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1276 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1277 return memif_syscall_error_handler (errno);
1279 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1280 return memif_syscall_error_handler (errno);
1282 if ((ftruncate (r->fd, r->region_size)) == -1)
1283 return memif_syscall_error_handler (errno);
1285 if ((r->shm = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1286 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1287 return memif_syscall_error_handler (errno);
1289 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1291 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1292 DBG ("RING: %p I: %d", ring, i);
1293 ring->head = ring->tail = 0;
1294 ring->cookie = MEMIF_COOKIE;
1296 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1298 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1299 ring->desc[j].region = 0;
1300 ring->desc[j].offset = buffer_offset +
1301 (uint32_t) (slot * conn->run_args.buffer_size);
1302 ring->desc[j].buffer_length = conn->run_args.buffer_size;
1305 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1307 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1308 DBG ("RING: %p I: %d", ring, i);
1309 ring->head = ring->tail = 0;
1310 ring->cookie = MEMIF_COOKIE;
1312 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1316 conn->run_args.num_s2m_rings) *
1317 (1 << conn->run_args.log2_ring_size) + j;
1318 ring->desc[j].region = 0;
1319 ring->desc[j].offset = buffer_offset +
1320 (uint32_t) (slot * conn->run_args.buffer_size);
1321 ring->desc[j].buffer_length = conn->run_args.buffer_size;
1326 (memif_queue_t *) malloc (sizeof (memif_queue_t) *
1327 conn->run_args.num_s2m_rings);
1329 return memif_syscall_error_handler (errno);
1331 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1333 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1334 return memif_syscall_error_handler (errno);
1335 /* add int fd to interrupt fd list */
1336 e.key = mq[x].int_fd;
1337 e.data_struct = conn;
1338 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1340 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1341 DBG ("RING: %p I: %d", mq[x].ring, x);
1342 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1345 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1346 mq[x].last_head = 0;
1347 mq[x].alloc_bufs = 0;
1349 conn->tx_queues = mq;
1352 (memif_queue_t *) malloc (sizeof (memif_queue_t) *
1353 conn->run_args.num_m2s_rings);
1355 return memif_syscall_error_handler (errno);
1356 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1358 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1359 return memif_syscall_error_handler (errno);
1360 /* add int fd to interrupt fd list */
1361 e.key = mq[x].int_fd;
1362 e.data_struct = conn;
1363 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1365 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1366 DBG ("RING: %p I: %d", mq[x].ring, x);
1367 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1370 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1371 mq[x].last_head = 0;
1372 mq[x].alloc_bufs = 0;
1374 conn->rx_queues = mq;
1380 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1381 memif_buffer_t * bufs, uint16_t count,
1382 uint16_t * count_out, uint16_t size)
1384 memif_connection_t *c = (memif_connection_t *) conn;
1386 return MEMIF_ERR_NOCONN;
1388 return MEMIF_ERR_DISCONNECTED;
1390 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1391 run_args.num_s2m_rings;
1393 return MEMIF_ERR_QID;
1394 memif_queue_t *mq = &c->tx_queues[qid];
1395 memif_ring_t *ring = mq->ring;
1396 memif_buffer_t *b0, *b1;
1397 uint8_t chain_buf = 1;
1398 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1399 uint16_t head = ring->head;
1400 uint16_t tail = ring->tail;
1401 uint16_t s0, s1, ns;
1403 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1405 ns = (1 << mq->log2_ring_size) - head + tail;
1407 /* calculate number of chain buffers */
1408 if (size > ring->desc[0].buffer_length)
1410 chain_buf = size / ring->desc[0].buffer_length;
1411 if (((size % ring->desc[0].buffer_length) != 0) || (size == 0))
1417 while ((count > 2) && (ns > 2))
1419 s0 = (ring->head + mq->alloc_bufs) & mask;
1420 s1 = (ring->head + mq->alloc_bufs + chain_buf) & mask;
1422 if ((2 * chain_buf) > ns)
1425 b0 = (bufs + *count_out);
1426 b1 = (bufs + *count_out + 1);
1428 b0->desc_index = head + mq->alloc_bufs;
1429 b1->desc_index = head + mq->alloc_bufs + chain_buf;
1430 ring->desc[s0].flags = 0;
1431 ring->desc[s1].flags = 0;
1432 b0->buffer_len = ring->desc[s0].buffer_length * chain_buf;
1433 b1->buffer_len = ring->desc[s1].buffer_length * chain_buf;
1434 /* TODO: support multiple regions -> ring descriptor contains region index */
1435 b0->data = c->regions->shm + ring->desc[s0].offset;
1436 b1->data = c->regions->shm + ring->desc[s1].offset;
1438 for (i = 0; i < (chain_buf - 1); i++)
1440 ring->desc[(s0 + i) & mask].flags |= MEMIF_DESC_FLAG_NEXT;
1441 ring->desc[(s1 + i) & mask].flags |= MEMIF_DESC_FLAG_NEXT;
1442 DBG ("allocating chained buffers");
1445 mq->alloc_bufs += 2 * chain_buf;
1447 DBG ("allocated ring slots %u, %u", s0, s1);
1449 ns -= (2 * chain_buf);
1452 s0 = (ring->head + mq->alloc_bufs) & mask;
1454 b0 = (bufs + *count_out);
1459 b0->desc_index = head + mq->alloc_bufs;
1460 ring->desc[s0].flags = 0;
1461 b0->buffer_len = ring->desc[s0].buffer_length * chain_buf;
1462 b0->data = c->regions->shm + ring->desc[s0].offset;
1464 for (i = 0; i < (chain_buf - 1); i++)
1466 ring->desc[(s0 + i) & mask].flags |= MEMIF_DESC_FLAG_NEXT;
1467 DBG ("allocating chained buffers");
1470 mq->alloc_bufs += chain_buf;
1472 DBG ("allocated ring slot %u", s0);
1478 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1483 DBG ("ring buffer full! qid: %u", qid);
1484 err = MEMIF_ERR_NOBUF_RING;
1491 memif_buffer_free (memif_conn_handle_t conn, uint16_t qid,
1492 memif_buffer_t * bufs, uint16_t count,
1493 uint16_t * count_out)
1495 memif_connection_t *c = (memif_connection_t *) conn;
1497 return MEMIF_ERR_NOCONN;
1499 return MEMIF_ERR_DISCONNECTED;
1501 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1502 run_args.num_m2s_rings;
1504 return MEMIF_ERR_QID;
1505 libmemif_main_t *lm = &libmemif_main;
1506 memif_queue_t *mq = &c->rx_queues[qid];
1507 memif_ring_t *ring = mq->ring;
1508 uint16_t tail = ring->tail;
1509 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1510 uint8_t chain_buf0, chain_buf1;
1511 memif_buffer_t *b0, *b1;
1514 if (mq->alloc_bufs < count)
1515 count = mq->alloc_bufs;
1521 b0 = (bufs + *count_out);
1522 b1 = (bufs + *count_out + 1);
1524 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1525 if ((b0->buffer_len %
1526 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1529 b1->buffer_len / ring->desc[b1->desc_index & mask].buffer_length;
1530 if ((b1->buffer_len %
1531 ring->desc[b1->desc_index & mask].buffer_length) != 0)
1533 tail = b1->desc_index + chain_buf1;
1539 mq->alloc_bufs -= chain_buf0 + chain_buf1;
1541 b0 = (bufs + *count_out);
1543 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1544 if ((b0->buffer_len %
1545 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1547 tail = b0->desc_index + chain_buf0;
1552 mq->alloc_bufs -= chain_buf0;
1554 MEMIF_MEMORY_BARRIER ();
1556 DBG ("tail: %u", ring->tail);
1558 return MEMIF_ERR_SUCCESS; /* 0 */
1562 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1563 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1565 memif_connection_t *c = (memif_connection_t *) conn;
1567 return MEMIF_ERR_NOCONN;
1569 return MEMIF_ERR_DISCONNECTED;
1571 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1572 run_args.num_s2m_rings;
1574 return MEMIF_ERR_QID;
1575 memif_queue_t *mq = &c->tx_queues[qid];
1576 memif_ring_t *ring = mq->ring;
1577 uint16_t head = ring->head;
1578 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1579 uint8_t chain_buf0, chain_buf1;
1581 uint16_t curr_buf = 0;
1582 memif_buffer_t *b0, *b1;
1589 b0 = (bufs + curr_buf);
1590 b1 = (bufs + curr_buf + 1);
1592 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1593 if ((b0->buffer_len %
1594 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1598 b1->buffer_len / ring->desc[b1->desc_index & mask].buffer_length;
1599 if ((b1->buffer_len %
1600 ring->desc[b1->desc_index & mask].buffer_length) != 0)
1603 for (i = 0; i < memif_min (chain_buf0, chain_buf1); i++)
1607 ring->desc[(b0->desc_index + i) & mask].buffer_length)
1610 ring->desc[(b0->desc_index + i) & mask].length =
1611 ring->desc[(b0->desc_index + i) & mask].buffer_length;
1615 ring->desc[(b0->desc_index + i) & mask].length =
1621 ring->desc[(b1->desc_index + i) & mask].buffer_length)
1624 ring->desc[(b1->desc_index + i) & mask].length =
1625 ring->desc[(b1->desc_index + i) & mask].buffer_length;
1629 ring->desc[(b1->desc_index + i) & mask].length =
1633 #ifdef MEMIF_DBG_SHM
1634 print_bytes (b0->data +
1635 ring->desc[(b0->desc_index +
1636 i) & mask].buffer_length *
1638 ring->desc[(b0->desc_index +
1639 i) & mask].buffer_length, DBG_TX_BUF);
1640 print_bytes (b1->data +
1641 ring->desc[(b1->desc_index +
1642 i) & mask].buffer_length *
1644 ring->desc[(b1->desc_index +
1645 i) & mask].buffer_length, DBG_TX_BUF);
1646 #endif /* MEMIF_DBG_SHM */
1649 if (chain_buf0 > chain_buf1)
1651 for (; i < chain_buf0; i++)
1654 ring->desc[(b0->desc_index + i) & mask].buffer_length)
1657 ring->desc[(b0->desc_index + i) & mask].length =
1658 ring->desc[(b0->desc_index + i) & mask].buffer_length;
1662 ring->desc[(b0->desc_index + i) & mask].length =
1666 #ifdef MEMIF_DBG_SHM
1667 print_bytes (b0->data +
1668 ring->desc[(b0->desc_index +
1669 i) & mask].buffer_length *
1671 ring->desc[(b0->desc_index +
1672 i) & mask].buffer_length,
1674 #endif /* MEMIF_DBG_SHM */
1679 for (; i < chain_buf1; i++)
1682 ring->desc[(b1->desc_index + i) & mask].buffer_length)
1685 ring->desc[(b1->desc_index + i) & mask].length =
1686 ring->desc[(b1->desc_index + i) & mask].buffer_length;
1690 ring->desc[(b1->desc_index + i) & mask].length =
1694 #ifdef MEMIF_DBG_SHM
1695 print_bytes (b1->data +
1696 ring->desc[(b1->desc_index +
1697 i) & mask].buffer_length *
1699 ring->desc[(b1->desc_index +
1700 i) & mask].buffer_length,
1702 #endif /* MEMIF_DBG_SHM */
1706 head = b1->desc_index + chain_buf1;
1710 if (b0->data_len != 0)
1711 DBG ("invalid b0 data length!");
1712 #endif /* MEMIF_DBG */
1715 if (b1->data_len != 0)
1716 DBG ("invalid b1 data length!");
1717 #endif /* MEMIF_DBG */
1720 *tx += chain_buf0 + chain_buf1;
1724 b0 = (bufs + curr_buf);
1726 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1727 if ((b0->buffer_len %
1728 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1731 for (i = 0; i < chain_buf0; i++)
1734 ring->desc[(b0->desc_index + i) & mask].buffer_length)
1736 b0->data_len -= ring->desc[(b0->desc_index + i) & mask].length =
1737 ring->desc[(b0->desc_index + i) & mask].buffer_length;
1741 ring->desc[(b0->desc_index + i) & mask].length = b0->data_len;
1744 #ifdef MEMIF_DBG_SHM
1745 print_bytes (b0->data +
1746 ring->desc[(b0->desc_index + i) & mask].buffer_length *
1748 ring->desc[(b0->desc_index + i) & mask].buffer_length,
1750 #endif /* MEMIF_DBG_SHM */
1753 head = b0->desc_index + chain_buf0;
1757 if (b0->data_len != 0)
1758 DBG ("invalid b0 data length!");
1759 #endif /* MEMIF_DBG */
1765 MEMIF_MEMORY_BARRIER ();
1768 mq->alloc_bufs -= *tx;
1770 /* TODO: return num of buffers and packets */
1773 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1776 int r = write (mq->int_fd, &a, sizeof (a));
1778 return MEMIF_ERR_INT_WRITE;
1781 return MEMIF_ERR_SUCCESS; /* 0 */
1785 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1786 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1788 memif_connection_t *c = (memif_connection_t *) conn;
1790 return MEMIF_ERR_NOCONN;
1792 return MEMIF_ERR_DISCONNECTED;
1794 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1795 run_args.num_m2s_rings;
1797 return MEMIF_ERR_QID;
1798 memif_queue_t *mq = &c->rx_queues[qid];
1799 memif_ring_t *ring = mq->ring;
1800 uint16_t head = ring->head;
1802 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1803 memif_buffer_t *b0, *b1;
1804 uint16_t curr_buf = 0;
1806 #ifdef MEMIF_DBG_SHM
1808 #endif /* MEMIF_DBG_SHM */
1811 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1812 if ((r == -1) && (errno != EAGAIN))
1813 return memif_syscall_error_handler (errno);
1815 if (head == mq->last_head)
1818 ns = head - mq->last_head;
1822 while ((ns > 2) && (count > 2))
1824 b0 = (bufs + curr_buf);
1825 b1 = (bufs + curr_buf + 1);
1827 b0->desc_index = mq->last_head;
1828 b0->data = memif_get_buffer (conn, ring, mq->last_head & mask);
1829 b0->data_len = ring->desc[mq->last_head & mask].length;
1830 b0->buffer_len = ring->desc[mq->last_head & mask].buffer_length;
1831 #ifdef MEMIF_DBG_SHM
1833 print_bytes (b0->data +
1834 ring->desc[b0->desc_index & mask].buffer_length * i++,
1835 ring->desc[b0->desc_index & mask].buffer_length,
1837 #endif /* MEMIF_DBG_SHM */
1840 while (ring->desc[mq->last_head & mask].
1841 flags & MEMIF_DESC_FLAG_NEXT)
1843 ring->desc[mq->last_head & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1845 b0->data_len += ring->desc[mq->last_head & mask].length;
1847 ring->desc[mq->last_head & mask].buffer_length;
1848 #ifdef MEMIF_DBG_SHM
1849 print_bytes (b0->data +
1850 ring->desc[b0->desc_index & mask].buffer_length *
1852 ring->desc[b0->desc_index & mask].buffer_length,
1854 #endif /* MEMIF_DBG_SHM */
1860 b1->desc_index = mq->last_head;
1861 b1->data = memif_get_buffer (conn, ring, mq->last_head & mask);
1862 b1->data_len = ring->desc[mq->last_head & mask].length;
1863 b1->buffer_len = ring->desc[mq->last_head & mask].buffer_length;
1864 #ifdef MEMIF_DBG_SHM
1866 print_bytes (b1->data +
1867 ring->desc[b1->desc_index & mask].buffer_length * i++,
1868 ring->desc[b1->desc_index & mask].buffer_length,
1870 #endif /* MEMIF_DBG_SHM */
1873 while (ring->desc[mq->last_head & mask].
1874 flags & MEMIF_DESC_FLAG_NEXT)
1876 ring->desc[mq->last_head & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1878 b1->data_len += ring->desc[mq->last_head & mask].length;
1880 ring->desc[mq->last_head & mask].buffer_length;
1881 #ifdef MEMIF_DBG_SHM
1882 print_bytes (b1->data +
1883 ring->desc[b1->desc_index & mask].buffer_length *
1885 ring->desc[b1->desc_index & mask].buffer_length,
1887 #endif /* MEMIF_DBG_SHM */
1896 b0 = (bufs + curr_buf);
1898 b0->desc_index = mq->last_head;
1899 b0->data = memif_get_buffer (conn, ring, mq->last_head & mask);
1900 b0->data_len = ring->desc[mq->last_head & mask].length;
1901 b0->buffer_len = ring->desc[mq->last_head & mask].buffer_length;
1902 #ifdef MEMIF_DBG_SHM
1904 print_bytes (b0->data +
1905 ring->desc[b0->desc_index & mask].buffer_length * i++,
1906 ring->desc[b0->desc_index & mask].buffer_length,
1908 #endif /* MEMIF_DBG_SHM */
1912 while (ring->desc[mq->last_head & mask].flags & MEMIF_DESC_FLAG_NEXT)
1914 ring->desc[mq->last_head & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1916 b0->data_len += ring->desc[mq->last_head & mask].length;
1917 b0->buffer_len += ring->desc[mq->last_head & mask].buffer_length;
1918 #ifdef MEMIF_DBG_SHM
1919 print_bytes (b0->data +
1920 ring->desc[b0->desc_index & mask].buffer_length * i++,
1921 ring->desc[b0->desc_index & mask].buffer_length,
1923 #endif /* MEMIF_DBG_SHM */
1933 mq->alloc_bufs += *rx;
1935 /* TODO: return num of buffers and packets */
1940 DBG ("not enough buffers!");
1941 return MEMIF_ERR_NOBUF;
1944 return MEMIF_ERR_SUCCESS; /* 0 */
1948 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1949 char *buf, ssize_t buflen)
1951 memif_connection_t *c = (memif_connection_t *) conn;
1953 return MEMIF_ERR_NOCONN;
1955 int err = MEMIF_ERR_SUCCESS, i;
1956 ssize_t l0, l1, total_l;
1959 l1 = strlen ((char *) c->args.interface_name);
1960 if (l0 + l1 < buflen)
1962 md->if_name = strcpy (buf + l0, (char *) c->args.interface_name);
1966 err = MEMIF_ERR_NOBUF_DET;
1968 l1 = strlen ((char *) c->args.instance_name);
1969 if (l0 + l1 < buflen)
1971 md->inst_name = strcpy (buf + l0, (char *) c->args.instance_name);
1975 err = MEMIF_ERR_NOBUF_DET;
1977 l1 = strlen ((char *) c->remote_if_name);
1978 if (l0 + l1 < buflen)
1980 md->remote_if_name = strcpy (buf + l0, (char *) c->remote_if_name);
1984 err = MEMIF_ERR_NOBUF_DET;
1986 l1 = strlen ((char *) c->remote_name);
1987 if (l0 + l1 < buflen)
1989 md->remote_inst_name = strcpy (buf + l0, (char *) c->remote_name);
1993 err = MEMIF_ERR_NOBUF_DET;
1995 md->id = c->args.interface_id;
1999 l1 = strlen ((char *) c->args.secret);
2000 if (l0 + l1 < buflen)
2002 md->secret = strcpy (buf + l0, (char *) c->args.secret);
2006 err = MEMIF_ERR_NOBUF_DET;
2009 md->role = (c->args.is_master) ? 0 : 1;
2010 md->mode = c->args.mode;
2012 l1 = strlen ((char *) c->args.socket_filename);
2013 if (l0 + l1 < buflen)
2015 md->socket_filename =
2016 strcpy (buf + l0, (char *) c->args.socket_filename);
2020 err = MEMIF_ERR_NOBUF_DET;
2023 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2024 run_args.num_m2s_rings;
2026 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
2027 if (l0 + l1 <= buflen)
2029 md->rx_queues = (memif_queue_details_t *) buf + l0;
2033 err = MEMIF_ERR_NOBUF_DET;
2035 for (i = 0; i < md->rx_queues_num; i++)
2037 md->rx_queues[i].qid = i;
2038 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2039 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2040 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2041 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2042 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2046 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
2047 run_args.num_s2m_rings;
2049 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2050 if (l0 + l1 <= buflen)
2052 md->tx_queues = (memif_queue_details_t *) buf + l0;
2056 err = MEMIF_ERR_NOBUF_DET;
2058 for (i = 0; i < md->tx_queues_num; i++)
2060 md->tx_queues[i].qid = i;
2061 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2062 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2063 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2064 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2065 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2068 md->link_up_down = (c->fd > 0) ? 1 : 0;
2074 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2076 memif_connection_t *c = (memif_connection_t *) conn;
2079 return MEMIF_ERR_NOCONN;
2081 return MEMIF_ERR_DISCONNECTED;
2083 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2084 run_args.num_m2s_rings;
2086 return MEMIF_ERR_QID;
2088 *efd = c->rx_queues[qid].int_fd;
2090 return MEMIF_ERR_SUCCESS;
2096 libmemif_main_t *lm = &libmemif_main;
2098 free (lm->app_name);
2099 lm->app_name = NULL;
2100 if (lm->control_list)
2101 free (lm->control_list);
2102 lm->control_list = NULL;
2103 if (lm->interrupt_list)
2104 free (lm->interrupt_list);
2105 lm->interrupt_list = NULL;
2106 if (lm->listener_list)
2107 free (lm->listener_list);
2108 lm->listener_list = NULL;
2109 if (lm->pending_list)
2110 free (lm->pending_list);
2111 lm->pending_list = NULL;
2112 if (poll_cancel_fd != -1)
2113 close (poll_cancel_fd);
2115 return MEMIF_ERR_SUCCESS; /* 0 */