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;
409 memset (lm, 0, sizeof (libmemif_main_t));
413 uint8_t len = (strlen (app_name) < MEMIF_NAME_LEN)
414 ? MEMIF_NAME_LEN : strlen (app_name);
415 strncpy ((char *) lm->app_name, app_name, strlen (app_name));
419 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
420 strlen (MEMIF_DEFAULT_APP_NAME));
423 /* register control fd update callback */
424 if (on_control_fd_update != NULL)
425 memif_control_fd_update_register (on_control_fd_update);
428 memif_epfd = epoll_create (1);
429 memif_control_fd_update_register (memif_control_fd_update);
430 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
433 DBG ("eventfd: %s", strerror (err));
434 return memif_syscall_error_handler (err);
436 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ);
437 DBG ("libmemif event polling initialized");
440 lm->control_list_len = 2;
441 lm->interrupt_list_len = 2;
442 lm->listener_list_len = 1;
443 lm->pending_list_len = 1;
446 malloc (sizeof (memif_list_elt_t) * lm->control_list_len);
448 malloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
450 malloc (sizeof (memif_list_elt_t) * lm->listener_list_len);
452 malloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
455 for (i = 0; i < lm->control_list_len; i++)
457 lm->control_list[i].key = -1;
458 lm->control_list[i].data_struct = NULL;
460 for (i = 0; i < lm->interrupt_list_len; i++)
462 lm->interrupt_list[i].key = -1;
463 lm->interrupt_list[i].data_struct = NULL;
465 for (i = 0; i < lm->listener_list_len; i++)
467 lm->listener_list[i].key = -1;
468 lm->listener_list[i].data_struct = NULL;
470 for (i = 0; i < lm->pending_list_len; i++)
472 lm->pending_list[i].key = -1;
473 lm->pending_list[i].data_struct = NULL;
476 lm->disconn_slaves = 0;
478 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
482 DBG ("timerfd: %s", strerror (err));
483 return memif_syscall_error_handler (err);
486 lm->arm.it_value.tv_sec = 2;
487 lm->arm.it_value.tv_nsec = 0;
488 lm->arm.it_interval.tv_sec = 2;
489 lm->arm.it_interval.tv_nsec = 0;
491 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
493 DBG ("callback type memif_control_fd_update_t error!");
494 return MEMIF_ERR_CB_FDUPDATE;
500 static inline memif_ring_t *
501 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
504 if (&conn->regions[0] == NULL)
506 void *p = conn->regions[0].shm;
508 sizeof (memif_ring_t) +
509 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
510 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
512 return (memif_ring_t *) p;
516 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
519 memif_connection_t *conn = (memif_connection_t *) c;
521 return MEMIF_ERR_NOCONN;
523 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->
524 run_args.num_m2s_rings;
526 return MEMIF_ERR_QID;
528 conn->rx_queues[qid].ring->flags = rx_mode;
529 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
530 return MEMIF_ERR_SUCCESS;
534 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
535 memif_connection_update_t * on_connect,
536 memif_connection_update_t * on_disconnect,
537 memif_interrupt_t * on_interrupt, void *private_ctx)
539 int err, i, index, sockfd = -1;
540 memif_list_elt_t list_elt;
541 memif_connection_t *conn = (memif_connection_t *) * c;
544 DBG ("This handle already points to existing memif.");
545 return MEMIF_ERR_CONN;
547 conn = (memif_connection_t *) malloc (sizeof (memif_connection_t));
550 err = memif_syscall_error_handler (errno);
553 memset (conn, 0, sizeof (memif_connection_t));
555 libmemif_main_t *lm = &libmemif_main;
557 conn->args.interface_id = args->interface_id;
559 if (args->log2_ring_size == 0)
560 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
561 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
563 err = MEMIF_ERR_MAX_RING;
566 if (args->buffer_size == 0)
567 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
568 if (args->num_s2m_rings == 0)
569 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
570 if (args->num_m2s_rings == 0)
571 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
573 conn->args.num_s2m_rings = args->num_s2m_rings;
574 conn->args.num_m2s_rings = args->num_m2s_rings;
575 conn->args.buffer_size = args->buffer_size;
576 conn->args.log2_ring_size = args->log2_ring_size;
577 conn->args.is_master = args->is_master;
578 conn->args.mode = args->mode;
579 conn->msg_queue = NULL;
580 conn->regions = NULL;
581 conn->tx_queues = NULL;
582 conn->rx_queues = NULL;
584 conn->on_connect = on_connect;
585 conn->on_disconnect = on_disconnect;
586 conn->on_interrupt = on_interrupt;
587 conn->private_ctx = private_ctx;
588 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
590 uint8_t l = strlen ((char *) args->interface_name);
591 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
594 l = strlen ((char *) args->instance_name);
595 strncpy ((char *) conn->args.instance_name, (char *) args->instance_name,
598 /* allocate and initialize socket_filename so it can be copyed to sun_path
599 without memory leaks */
600 conn->args.socket_filename = malloc (sizeof (char *) * 108);
601 memset (conn->args.socket_filename, 0, 108 * sizeof (char *));
603 if (args->socket_filename)
605 if (conn->args.socket_filename == NULL)
607 err = memif_syscall_error_handler (errno);
610 strncpy ((char *) conn->args.socket_filename,
611 (char *) args->socket_filename,
612 strlen ((char *) args->socket_filename));
616 uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR);
617 uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME);
618 if (conn->args.socket_filename == NULL)
620 err = memif_syscall_error_handler (errno);
623 strncpy ((char *) conn->args.socket_filename,
624 MEMIF_DEFAULT_SOCKET_DIR, sdl);
625 conn->args.socket_filename[sdl] = '/';
626 strncpy ((char *) (conn->args.socket_filename + 1 + sdl),
627 MEMIF_DEFAULT_SOCKET_FILENAME, sfl);
632 l = strlen ((char *) args->secret);
633 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
636 if (conn->args.is_master)
638 conn->run_args.buffer_size = conn->args.buffer_size;
640 memif_list_elt_t elt;
641 for (i = 0; i < lm->listener_list_len; i++)
644 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
647 ((char *) ms->filename, (char *) conn->args.socket_filename,
648 strlen ((char *) ms->filename)) == 0)
650 /* add interface to listener socket */
651 elt.key = conn->args.interface_id;
652 *c = elt.data_struct = conn;
653 add_list_elt (&elt, &ms->interface_list,
654 &ms->interface_list_len);
656 conn->listener_fd = ms->fd;
662 struct stat file_stat;
663 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
665 if (S_ISSOCK (file_stat.st_mode))
666 unlink ((char *) conn->args.socket_filename);
668 return memif_syscall_error_handler (errno);
670 DBG ("creating socket file");
671 ms = malloc (sizeof (memif_socket_t));
673 malloc (strlen ((char *) conn->args.socket_filename) +
675 memset (ms->filename, 0,
676 strlen ((char *) conn->args.socket_filename) +
678 strncpy ((char *) ms->filename,
679 (char *) conn->args.socket_filename,
680 strlen ((char *) conn->args.socket_filename));
681 ms->interface_list_len = 1;
683 malloc (sizeof (memif_list_elt_t) * ms->interface_list_len);
684 ms->interface_list[0].key = -1;
685 ms->interface_list[0].data_struct = NULL;
686 struct sockaddr_un un = { 0 };
689 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
692 err = memif_syscall_error_handler (errno);
695 DBG ("socket %d created", ms->fd);
696 un.sun_family = AF_UNIX;
697 strncpy ((char *) un.sun_path, (char *) ms->filename,
698 sizeof (un.sun_path) - 1);
701 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
703 err = memif_syscall_error_handler (errno);
707 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
709 err = memif_syscall_error_handler (errno);
713 if (listen (ms->fd, 1) < 0)
715 err = memif_syscall_error_handler (errno);
719 if (stat ((char *) ms->filename, &file_stat) < 0)
721 err = memif_syscall_error_handler (errno);
725 /* add interface to listener socket */
726 elt.key = conn->args.interface_id;
727 *c = elt.data_struct = conn;
728 add_list_elt (&elt, &ms->interface_list,
729 &ms->interface_list_len);
731 conn->listener_fd = ms->fd;
733 /* add listener socket to libmemif main */
735 elt.data_struct = ms;
736 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
737 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
744 if (lm->disconn_slaves == 0)
746 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
748 err = memif_syscall_error_handler (errno);
753 lm->disconn_slaves++;
756 *c = list_elt.data_struct = conn;
758 add_list_elt (&list_elt, &lm->control_list,
759 &lm->control_list_len)) < 0)
761 err = MEMIF_ERR_NOMEM;
774 if (conn->args.socket_filename)
775 free (conn->args.socket_filename);
783 memif_control_fd_handler (int fd, uint8_t events)
785 int i, rv, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */
787 memif_list_elt_t *e = NULL;
788 memif_connection_t *conn;
789 libmemif_main_t *lm = &libmemif_main;
790 if (fd == lm->timerfd)
794 size = read (fd, &b, sizeof (b));
795 for (i = 0; i < lm->control_list_len; i++)
797 if ((lm->control_list[i].key < 0)
798 && (lm->control_list[i].data_struct != NULL))
800 conn = lm->control_list[i].data_struct;
801 if (conn->args.is_master)
804 struct sockaddr_un sun;
805 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
808 err = memif_syscall_error_handler (errno);
812 sun.sun_family = AF_UNIX;
814 strncpy (sun.sun_path, conn->args.socket_filename,
815 sizeof (sun.sun_path) - 1);
817 if (connect (sockfd, (struct sockaddr *) &sun,
818 sizeof (struct sockaddr_un)) == 0)
821 conn->read_fn = memif_conn_fd_read_ready;
822 conn->write_fn = memif_conn_fd_write_ready;
823 conn->error_fn = memif_conn_fd_error;
825 lm->control_list[conn->index].key = conn->fd;
827 lm->control_fd_update (sockfd,
828 MEMIF_FD_EVENT_READ |
829 MEMIF_FD_EVENT_WRITE);
831 lm->disconn_slaves--;
832 if (lm->disconn_slaves == 0)
834 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL)
837 err = memif_syscall_error_handler (errno);
844 err = memif_syscall_error_handler (errno);
852 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
855 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
858 (((memif_connection_t *) e->data_struct)->
859 args.is_master) ? ((memif_connection_t *) e->
860 data_struct)->run_args.
861 num_s2m_rings : ((memif_connection_t *) e->data_struct)->
862 run_args.num_m2s_rings;
863 for (i = 0; i < num; i++)
865 if (((memif_connection_t *) e->data_struct)->
866 rx_queues[i].int_fd == fd)
868 ((memif_connection_t *) e->data_struct)->
869 on_interrupt ((void *) e->data_struct,
870 ((memif_connection_t *) e->
871 data_struct)->private_ctx, i);
872 return MEMIF_ERR_SUCCESS;
876 return MEMIF_ERR_SUCCESS;
878 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
881 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
882 return MEMIF_ERR_SUCCESS;
885 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
888 memif_read_ready (fd);
889 return MEMIF_ERR_SUCCESS;
892 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
895 if (events & MEMIF_FD_EVENT_READ)
898 ((memif_connection_t *) e->data_struct)->
899 read_fn (e->data_struct);
900 if (err != MEMIF_ERR_SUCCESS)
903 if (events & MEMIF_FD_EVENT_WRITE)
906 ((memif_connection_t *) e->data_struct)->
907 write_fn (e->data_struct);
908 if (err != MEMIF_ERR_SUCCESS)
911 if (events & MEMIF_FD_EVENT_ERROR)
914 ((memif_connection_t *) e->data_struct)->
915 error_fn (e->data_struct);
916 if (err != MEMIF_ERR_SUCCESS)
922 return MEMIF_ERR_SUCCESS; /* 0 */
932 memif_poll_event (int timeout)
934 libmemif_main_t *lm = &libmemif_main;
935 memif_list_elt_t *elt;
936 struct epoll_event evt, *e;
937 int en = 0, err = MEMIF_ERR_SUCCESS, i = 0; /* 0 */
940 uint64_t counter = 0;
942 memset (&evt, 0, sizeof (evt));
943 evt.events = EPOLLIN | EPOLLOUT;
945 sigemptyset (&sigset);
946 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
950 DBG ("epoll_pwait: %s", strerror (err));
951 return memif_syscall_error_handler (err);
955 if (evt.data.fd == poll_cancel_fd)
957 r = read (evt.data.fd, &counter, sizeof (counter));
958 return MEMIF_ERR_POLL_CANCEL;
960 if (evt.events & EPOLLIN)
961 events |= MEMIF_FD_EVENT_READ;
962 if (evt.events & EPOLLOUT)
963 events |= MEMIF_FD_EVENT_WRITE;
964 if (evt.events & EPOLLERR)
965 events |= MEMIF_FD_EVENT_ERROR;
966 err = memif_control_fd_handler (evt.data.fd, events);
973 memif_cancel_poll_event ()
975 uint64_t counter = 1;
978 if (poll_cancel_fd == -1)
980 w = write (poll_cancel_fd, &counter, sizeof (counter));
981 if (w < sizeof (counter))
982 return MEMIF_ERR_INT_WRITE;
988 memif_msg_queue_free (memif_msg_queue_elt_t ** e)
992 memif_msg_queue_free (&(*e)->next);
998 /* send disconnect msg and close interface */
1000 memif_disconnect_internal (memif_connection_t * c)
1004 DBG ("no connection");
1005 return MEMIF_ERR_NOCONN;
1008 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1010 libmemif_main_t *lm = &libmemif_main;
1011 memif_list_elt_t *e;
1013 c->on_disconnect ((void *) c, c->private_ctx);
1017 memif_msg_send_disconnect (c->fd, "interface deleted", 0);
1018 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1021 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1024 if (c->args.is_master)
1025 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1026 e->key = c->fd = -1;
1029 if (c->tx_queues != NULL)
1032 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1033 run_args.num_s2m_rings;
1034 for (i = 0; i < num; i++)
1036 mq = &c->tx_queues[i];
1041 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1046 free (c->tx_queues);
1047 c->tx_queues = NULL;
1050 if (c->rx_queues != NULL)
1053 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1054 run_args.num_m2s_rings;
1055 for (i = 0; i < num; i++)
1057 mq = &c->rx_queues[i];
1062 if (c->on_interrupt != NULL)
1063 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1066 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1071 free (c->rx_queues);
1072 c->rx_queues = NULL;
1075 if (c->regions != NULL)
1077 if (munmap (c->regions[0].shm, c->regions[0].region_size) < 0)
1078 return memif_syscall_error_handler (errno);
1079 if (c->regions[0].fd > 0)
1080 close (c->regions[0].fd);
1081 c->regions[0].fd = -1;
1086 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1088 memif_msg_queue_free (&c->msg_queue);
1090 if (!(c->args.is_master))
1092 if (lm->disconn_slaves == 0)
1094 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1096 err = memif_syscall_error_handler (errno);
1097 DBG_UNIX ("timerfd_settime: arm");
1100 lm->disconn_slaves++;
1107 memif_delete (memif_conn_handle_t * conn)
1109 memif_connection_t *c = (memif_connection_t *) * conn;
1112 DBG ("no connection");
1113 return MEMIF_ERR_NOCONN;
1115 libmemif_main_t *lm = &libmemif_main;
1116 memif_list_elt_t *e = NULL;
1117 memif_socket_t *ms = NULL;
1119 int err = MEMIF_ERR_SUCCESS;
1123 DBG ("DISCONNECTING");
1124 err = memif_disconnect_internal (c);
1125 if (err == MEMIF_ERR_NOCONN)
1129 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1131 if (c->args.is_master)
1133 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1137 ms = (memif_socket_t *) e->data_struct;
1139 free_list_elt (ms->interface_list, ms->interface_list_len,
1140 c->args.interface_id);
1141 if (ms->use_count <= 0)
1143 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1144 free_list_elt (lm->listener_list, lm->listener_list_len,
1146 close (c->listener_fd);
1147 c->listener_fd = ms->fd = -1;
1148 free (ms->interface_list);
1149 ms->interface_list = NULL;
1150 free (ms->filename);
1151 ms->filename = NULL;
1159 lm->disconn_slaves--;
1160 if (lm->disconn_slaves <= 0)
1162 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1164 err = memif_syscall_error_handler (errno);
1165 DBG ("timerfd_settime: disarm");
1170 if (c->args.socket_filename)
1171 free (c->args.socket_filename);
1172 c->args.socket_filename = NULL;
1182 memif_connect1 (memif_connection_t * c)
1184 libmemif_main_t *lm = &libmemif_main;
1185 memif_region_t *mr = c->regions;
1195 return MEMIF_ERR_NO_SHMFD;
1197 if ((mr->shm = mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1198 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1200 return memif_syscall_error_handler (errno);
1206 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1207 run_args.num_s2m_rings;
1208 for (i = 0; i < num; i++)
1210 mq = &c->tx_queues[i];
1213 mq->ring = c->regions[mq->region].shm + mq->offset;
1214 if (mq->ring->cookie != MEMIF_COOKIE)
1216 DBG ("wrong cookie on tx ring %u", i);
1217 return MEMIF_ERR_COOKIE;
1219 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1224 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1225 run_args.num_m2s_rings;
1226 for (i = 0; i < num; i++)
1228 mq = &c->rx_queues[i];
1231 mq->ring = c->regions[mq->region].shm + mq->offset;
1232 if (mq->ring->cookie != MEMIF_COOKIE)
1234 DBG ("wrong cookie on rx ring %u", i);
1235 return MEMIF_ERR_COOKIE;
1237 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1242 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1248 memif_init_regions_and_queues (memif_connection_t * conn)
1250 memif_ring_t *ring = NULL;
1251 uint64_t buffer_offset;
1254 libmemif_main_t *lm = &libmemif_main;
1257 conn->regions = (memif_region_t *) malloc (sizeof (memif_region_t));
1258 if (conn->regions == NULL)
1259 return memif_syscall_error_handler (errno);
1263 (conn->run_args.num_s2m_rings +
1264 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1265 sizeof (memif_desc_t) *
1266 (1 << conn->run_args.log2_ring_size));
1268 r->region_size = buffer_offset +
1269 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1270 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1272 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1273 return memif_syscall_error_handler (errno);
1275 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1276 return memif_syscall_error_handler (errno);
1278 if ((ftruncate (r->fd, r->region_size)) == -1)
1279 return memif_syscall_error_handler (errno);
1281 if ((r->shm = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1282 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1283 return memif_syscall_error_handler (errno);
1285 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1287 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1288 DBG ("RING: %p I: %d", ring, i);
1289 ring->head = ring->tail = 0;
1290 ring->cookie = MEMIF_COOKIE;
1292 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1294 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1295 ring->desc[j].region = 0;
1296 ring->desc[j].offset = buffer_offset +
1297 (uint32_t) (slot * conn->run_args.buffer_size);
1298 ring->desc[j].buffer_length = conn->run_args.buffer_size;
1301 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1303 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1304 DBG ("RING: %p I: %d", ring, i);
1305 ring->head = ring->tail = 0;
1306 ring->cookie = MEMIF_COOKIE;
1308 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1312 conn->run_args.num_s2m_rings) *
1313 (1 << conn->run_args.log2_ring_size) + j;
1314 ring->desc[j].region = 0;
1315 ring->desc[j].offset = buffer_offset +
1316 (uint32_t) (slot * conn->run_args.buffer_size);
1317 ring->desc[j].buffer_length = conn->run_args.buffer_size;
1322 (memif_queue_t *) malloc (sizeof (memif_queue_t) *
1323 conn->run_args.num_s2m_rings);
1325 return memif_syscall_error_handler (errno);
1327 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1329 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1330 return memif_syscall_error_handler (errno);
1331 /* add int fd to interrupt fd list */
1332 e.key = mq[x].int_fd;
1333 e.data_struct = conn;
1334 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1336 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1337 DBG ("RING: %p I: %d", mq[x].ring, x);
1338 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1341 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1342 mq[x].last_head = 0;
1343 mq[x].alloc_bufs = 0;
1345 conn->tx_queues = mq;
1348 (memif_queue_t *) malloc (sizeof (memif_queue_t) *
1349 conn->run_args.num_m2s_rings);
1351 return memif_syscall_error_handler (errno);
1352 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1354 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1355 return memif_syscall_error_handler (errno);
1356 /* add int fd to interrupt fd list */
1357 e.key = mq[x].int_fd;
1358 e.data_struct = conn;
1359 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1361 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1362 DBG ("RING: %p I: %d", mq[x].ring, x);
1363 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1366 (void *) mq[x].ring - (void *) conn->regions[mq->region].shm;
1367 mq[x].last_head = 0;
1368 mq[x].alloc_bufs = 0;
1370 conn->rx_queues = mq;
1376 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1377 memif_buffer_t * bufs, uint16_t count,
1378 uint16_t * count_out, uint16_t size)
1380 memif_connection_t *c = (memif_connection_t *) conn;
1382 return MEMIF_ERR_NOCONN;
1384 return MEMIF_ERR_DISCONNECTED;
1386 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1387 run_args.num_s2m_rings;
1389 return MEMIF_ERR_QID;
1390 memif_queue_t *mq = &c->tx_queues[qid];
1391 memif_ring_t *ring = mq->ring;
1392 memif_buffer_t *b0, *b1;
1393 uint8_t chain_buf = 1;
1394 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1395 uint16_t head = ring->head;
1396 uint16_t tail = ring->tail;
1398 uint16_t s0, s1, ns;
1400 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1402 ring_size = (1 << mq->log2_ring_size);
1403 ns = ring_size - head + tail;
1405 /* calculate number of chain buffers */
1406 if (size > ring->desc[0].buffer_length)
1408 chain_buf = size / ring->desc[0].buffer_length;
1409 if (((size % ring->desc[0].buffer_length) != 0) || (size == 0))
1415 while ((count > 2) && (ns > 2))
1417 s0 = (ring->head + mq->alloc_bufs) & mask;
1418 s1 = (ring->head + mq->alloc_bufs + chain_buf) & mask;
1420 if ((2 * chain_buf) > ns)
1423 b0 = (bufs + *count_out);
1424 b1 = (bufs + *count_out + 1);
1426 b0->desc_index = head + mq->alloc_bufs;
1427 b1->desc_index = head + mq->alloc_bufs + chain_buf;
1428 ring->desc[s0].flags = 0;
1429 ring->desc[s1].flags = 0;
1430 b0->buffer_len = ring->desc[s0].buffer_length * chain_buf;
1431 b1->buffer_len = ring->desc[s1].buffer_length * chain_buf;
1432 /* TODO: support multiple regions -> ring descriptor contains region index */
1433 b0->data = c->regions->shm + ring->desc[s0].offset;
1434 b1->data = c->regions->shm + ring->desc[s1].offset;
1436 for (i = 0; i < (chain_buf - 1); i++)
1438 ring->desc[(s0 + i) & mask].flags |= MEMIF_DESC_FLAG_NEXT;
1439 ring->desc[(s1 + i) & mask].flags |= MEMIF_DESC_FLAG_NEXT;
1440 DBG ("allocating chained buffers");
1443 mq->alloc_bufs += 2 * chain_buf;
1445 DBG ("allocated ring slots %u, %u", s0, s1);
1447 ns -= (2 * chain_buf);
1450 s0 = (ring->head + mq->alloc_bufs) & mask;
1452 b0 = (bufs + *count_out);
1457 b0->desc_index = head + mq->alloc_bufs;
1458 ring->desc[s0].flags = 0;
1459 b0->buffer_len = ring->desc[s0].buffer_length * chain_buf;
1460 b0->data = c->regions->shm + ring->desc[s0].offset;
1462 for (i = 0; i < (chain_buf - 1); i++)
1464 ring->desc[(s0 + i) & mask].flags |= MEMIF_DESC_FLAG_NEXT;
1465 DBG ("allocating chained buffers");
1468 mq->alloc_bufs += chain_buf;
1470 DBG ("allocated ring slot %u", s0);
1476 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1481 DBG ("ring buffer full! qid: %u", qid);
1482 err = MEMIF_ERR_NOBUF_RING;
1489 memif_buffer_free (memif_conn_handle_t conn, uint16_t qid,
1490 memif_buffer_t * bufs, uint16_t count,
1491 uint16_t * count_out)
1493 memif_connection_t *c = (memif_connection_t *) conn;
1495 return MEMIF_ERR_NOCONN;
1497 return MEMIF_ERR_DISCONNECTED;
1499 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1500 run_args.num_m2s_rings;
1502 return MEMIF_ERR_QID;
1503 libmemif_main_t *lm = &libmemif_main;
1504 memif_queue_t *mq = &c->rx_queues[qid];
1505 memif_ring_t *ring = mq->ring;
1506 uint16_t tail = ring->tail;
1507 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1508 uint8_t chain_buf0, chain_buf1;
1509 memif_buffer_t *b0, *b1;
1512 if (mq->alloc_bufs < count)
1513 count = mq->alloc_bufs;
1519 b0 = (bufs + *count_out);
1520 b1 = (bufs + *count_out + 1);
1522 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1523 if ((b0->buffer_len %
1524 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1527 b1->buffer_len / ring->desc[b1->desc_index & mask].buffer_length;
1528 if ((b1->buffer_len %
1529 ring->desc[b1->desc_index & mask].buffer_length) != 0)
1531 tail = b1->desc_index + chain_buf1;
1537 mq->alloc_bufs -= chain_buf0 + chain_buf1;
1539 b0 = (bufs + *count_out);
1541 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1542 if ((b0->buffer_len %
1543 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1545 tail = b0->desc_index + chain_buf0;
1550 mq->alloc_bufs -= chain_buf0;
1552 MEMIF_MEMORY_BARRIER ();
1554 DBG ("tail: %u", ring->tail);
1556 return MEMIF_ERR_SUCCESS; /* 0 */
1560 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1561 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1563 memif_connection_t *c = (memif_connection_t *) conn;
1565 return MEMIF_ERR_NOCONN;
1567 return MEMIF_ERR_DISCONNECTED;
1569 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1570 run_args.num_s2m_rings;
1572 return MEMIF_ERR_QID;
1573 memif_queue_t *mq = &c->tx_queues[qid];
1574 memif_ring_t *ring = mq->ring;
1575 uint16_t head = ring->head;
1576 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1577 uint8_t chain_buf0, chain_buf1;
1579 uint16_t curr_buf = 0;
1580 memif_buffer_t *b0, *b1;
1587 b0 = (bufs + curr_buf);
1588 b1 = (bufs + curr_buf + 1);
1590 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1591 if ((b0->buffer_len %
1592 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1596 b1->buffer_len / ring->desc[b1->desc_index & mask].buffer_length;
1597 if ((b1->buffer_len %
1598 ring->desc[b1->desc_index & mask].buffer_length) != 0)
1601 for (i = 0; i < memif_min (chain_buf0, chain_buf1); i++)
1605 ring->desc[(b0->desc_index + i) & mask].buffer_length)
1608 ring->desc[(b0->desc_index + i) & mask].length =
1609 ring->desc[(b0->desc_index + i) & mask].buffer_length;
1613 ring->desc[(b0->desc_index + i) & mask].length =
1619 ring->desc[(b1->desc_index + i) & mask].buffer_length)
1622 ring->desc[(b1->desc_index + i) & mask].length =
1623 ring->desc[(b1->desc_index + i) & mask].buffer_length;
1627 ring->desc[(b1->desc_index + i) & mask].length =
1631 #ifdef MEMIF_DBG_SHM
1632 print_bytes (b0->data +
1633 ring->desc[(b0->desc_index +
1634 i) & mask].buffer_length *
1636 ring->desc[(b0->desc_index +
1637 i) & mask].buffer_length, DBG_TX_BUF);
1638 print_bytes (b1->data +
1639 ring->desc[(b1->desc_index +
1640 i) & mask].buffer_length *
1642 ring->desc[(b1->desc_index +
1643 i) & mask].buffer_length, DBG_TX_BUF);
1644 #endif /* MEMIF_DBG_SHM */
1647 if (chain_buf0 > chain_buf1)
1649 for (; i < chain_buf0; i++)
1652 ring->desc[(b0->desc_index + i) & mask].buffer_length)
1655 ring->desc[(b0->desc_index + i) & mask].length =
1656 ring->desc[(b0->desc_index + i) & mask].buffer_length;
1660 ring->desc[(b0->desc_index + i) & mask].length =
1664 #ifdef MEMIF_DBG_SHM
1665 print_bytes (b0->data +
1666 ring->desc[(b0->desc_index +
1667 i) & mask].buffer_length *
1669 ring->desc[(b0->desc_index +
1670 i) & mask].buffer_length,
1672 #endif /* MEMIF_DBG_SHM */
1677 for (; i < chain_buf1; i++)
1680 ring->desc[(b1->desc_index + i) & mask].buffer_length)
1683 ring->desc[(b1->desc_index + i) & mask].length =
1684 ring->desc[(b1->desc_index + i) & mask].buffer_length;
1688 ring->desc[(b1->desc_index + i) & mask].length =
1692 #ifdef MEMIF_DBG_SHM
1693 print_bytes (b1->data +
1694 ring->desc[(b1->desc_index +
1695 i) & mask].buffer_length *
1697 ring->desc[(b1->desc_index +
1698 i) & mask].buffer_length,
1700 #endif /* MEMIF_DBG_SHM */
1704 head = b1->desc_index + chain_buf1;
1708 if (b0->data_len != 0)
1709 DBG ("invalid b0 data length!");
1710 #endif /* MEMIF_DBG */
1713 if (b1->data_len != 0)
1714 DBG ("invalid b1 data length!");
1715 #endif /* MEMIF_DBG */
1718 *tx += chain_buf0 + chain_buf1;
1722 b0 = (bufs + curr_buf);
1724 b0->buffer_len / ring->desc[b0->desc_index & mask].buffer_length;
1725 if ((b0->buffer_len %
1726 ring->desc[b0->desc_index & mask].buffer_length) != 0)
1729 for (i = 0; i < chain_buf0; i++)
1732 ring->desc[(b0->desc_index + i) & mask].buffer_length)
1734 b0->data_len -= ring->desc[(b0->desc_index + i) & mask].length =
1735 ring->desc[(b0->desc_index + i) & mask].buffer_length;
1739 ring->desc[(b0->desc_index + i) & mask].length = b0->data_len;
1742 #ifdef MEMIF_DBG_SHM
1743 print_bytes (b0->data +
1744 ring->desc[(b0->desc_index + i) & mask].buffer_length *
1746 ring->desc[(b0->desc_index + i) & mask].buffer_length,
1748 #endif /* MEMIF_DBG_SHM */
1751 head = b0->desc_index + chain_buf0;
1755 if (b0->data_len != 0)
1756 DBG ("invalid b0 data length!");
1757 #endif /* MEMIF_DBG */
1763 MEMIF_MEMORY_BARRIER ();
1766 mq->alloc_bufs -= *tx;
1768 /* TODO: return num of buffers and packets */
1771 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1774 int r = write (mq->int_fd, &a, sizeof (a));
1776 return MEMIF_ERR_INT_WRITE;
1779 return MEMIF_ERR_SUCCESS; /* 0 */
1783 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1784 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1786 memif_connection_t *c = (memif_connection_t *) conn;
1788 return MEMIF_ERR_NOCONN;
1790 return MEMIF_ERR_DISCONNECTED;
1792 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1793 run_args.num_m2s_rings;
1795 return MEMIF_ERR_QID;
1796 memif_queue_t *mq = &c->rx_queues[qid];
1797 memif_ring_t *ring = mq->ring;
1798 uint16_t head = ring->head;
1800 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1801 memif_buffer_t *b0, *b1;
1802 uint16_t curr_buf = 0;
1804 #ifdef MEMIF_DBG_SHM
1806 #endif /* MEMIF_DBG_SHM */
1809 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1810 if ((r == -1) && (errno != EAGAIN))
1811 return memif_syscall_error_handler (errno);
1813 if (head == mq->last_head)
1816 ns = head - mq->last_head;
1820 while ((ns > 2) && (count > 2))
1822 b0 = (bufs + curr_buf);
1823 b1 = (bufs + curr_buf + 1);
1825 b0->desc_index = mq->last_head;
1826 b0->data = memif_get_buffer (conn, ring, mq->last_head & mask);
1827 b0->data_len = ring->desc[mq->last_head & mask].length;
1828 b0->buffer_len = ring->desc[mq->last_head & mask].buffer_length;
1829 #ifdef MEMIF_DBG_SHM
1831 print_bytes (b0->data +
1832 ring->desc[b0->desc_index & mask].buffer_length * i++,
1833 ring->desc[b0->desc_index & mask].buffer_length,
1835 #endif /* MEMIF_DBG_SHM */
1838 while (ring->desc[mq->last_head & mask].
1839 flags & MEMIF_DESC_FLAG_NEXT)
1841 ring->desc[mq->last_head & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1843 b0->data_len += ring->desc[mq->last_head & mask].length;
1845 ring->desc[mq->last_head & mask].buffer_length;
1846 #ifdef MEMIF_DBG_SHM
1847 print_bytes (b0->data +
1848 ring->desc[b0->desc_index & mask].buffer_length *
1850 ring->desc[b0->desc_index & mask].buffer_length,
1852 #endif /* MEMIF_DBG_SHM */
1858 b1->desc_index = mq->last_head;
1859 b1->data = memif_get_buffer (conn, ring, mq->last_head & mask);
1860 b1->data_len = ring->desc[mq->last_head & mask].length;
1861 b1->buffer_len = ring->desc[mq->last_head & mask].buffer_length;
1862 #ifdef MEMIF_DBG_SHM
1864 print_bytes (b1->data +
1865 ring->desc[b1->desc_index & mask].buffer_length * i++,
1866 ring->desc[b1->desc_index & mask].buffer_length,
1868 #endif /* MEMIF_DBG_SHM */
1871 while (ring->desc[mq->last_head & mask].
1872 flags & MEMIF_DESC_FLAG_NEXT)
1874 ring->desc[mq->last_head & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1876 b1->data_len += ring->desc[mq->last_head & mask].length;
1878 ring->desc[mq->last_head & mask].buffer_length;
1879 #ifdef MEMIF_DBG_SHM
1880 print_bytes (b1->data +
1881 ring->desc[b1->desc_index & mask].buffer_length *
1883 ring->desc[b1->desc_index & mask].buffer_length,
1885 #endif /* MEMIF_DBG_SHM */
1894 b0 = (bufs + curr_buf);
1896 b0->desc_index = mq->last_head;
1897 b0->data = memif_get_buffer (conn, ring, mq->last_head & mask);
1898 b0->data_len = ring->desc[mq->last_head & mask].length;
1899 b0->buffer_len = ring->desc[mq->last_head & mask].buffer_length;
1900 #ifdef MEMIF_DBG_SHM
1902 print_bytes (b0->data +
1903 ring->desc[b0->desc_index & mask].buffer_length * i++,
1904 ring->desc[b0->desc_index & mask].buffer_length,
1906 #endif /* MEMIF_DBG_SHM */
1910 while (ring->desc[mq->last_head & mask].flags & MEMIF_DESC_FLAG_NEXT)
1912 ring->desc[mq->last_head & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1914 b0->data_len += ring->desc[mq->last_head & mask].length;
1915 b0->buffer_len += ring->desc[mq->last_head & mask].buffer_length;
1916 #ifdef MEMIF_DBG_SHM
1917 print_bytes (b0->data +
1918 ring->desc[b0->desc_index & mask].buffer_length * i++,
1919 ring->desc[b0->desc_index & mask].buffer_length,
1921 #endif /* MEMIF_DBG_SHM */
1931 mq->alloc_bufs += *rx;
1933 /* TODO: return num of buffers and packets */
1938 DBG ("not enough buffers!");
1939 return MEMIF_ERR_NOBUF;
1942 return MEMIF_ERR_SUCCESS; /* 0 */
1946 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1947 char *buf, ssize_t buflen)
1949 memif_connection_t *c = (memif_connection_t *) conn;
1951 return MEMIF_ERR_NOCONN;
1953 int err = MEMIF_ERR_SUCCESS, i;
1954 ssize_t l0, l1, total_l;
1957 l1 = strlen ((char *) c->args.interface_name);
1958 if (l0 + l1 < buflen)
1960 md->if_name = strcpy (buf + l0, (char *) c->args.interface_name);
1964 err = MEMIF_ERR_NOBUF_DET;
1966 l1 = strlen ((char *) c->args.instance_name);
1967 if (l0 + l1 < buflen)
1969 md->inst_name = strcpy (buf + l0, (char *) c->args.instance_name);
1973 err = MEMIF_ERR_NOBUF_DET;
1975 l1 = strlen ((char *) c->remote_if_name);
1976 if (l0 + l1 < buflen)
1978 md->remote_if_name = strcpy (buf + l0, (char *) c->remote_if_name);
1982 err = MEMIF_ERR_NOBUF_DET;
1984 l1 = strlen ((char *) c->remote_name);
1985 if (l0 + l1 < buflen)
1987 md->remote_inst_name = strcpy (buf + l0, (char *) c->remote_name);
1991 err = MEMIF_ERR_NOBUF_DET;
1993 md->id = c->args.interface_id;
1997 l1 = strlen ((char *) c->args.secret);
1998 if (l0 + l1 < buflen)
2000 md->secret = strcpy (buf + l0, (char *) c->args.secret);
2004 err = MEMIF_ERR_NOBUF_DET;
2007 md->role = (c->args.is_master) ? 0 : 1;
2008 md->mode = c->args.mode;
2010 l1 = strlen ((char *) c->args.socket_filename);
2011 if (l0 + l1 < buflen)
2013 md->socket_filename =
2014 strcpy (buf + l0, (char *) c->args.socket_filename);
2018 err = MEMIF_ERR_NOBUF_DET;
2021 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2022 run_args.num_m2s_rings;
2024 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
2025 if (l0 + l1 <= buflen)
2027 md->rx_queues = (memif_queue_details_t *) buf + l0;
2031 err = MEMIF_ERR_NOBUF_DET;
2033 for (i = 0; i < md->rx_queues_num; i++)
2035 md->rx_queues[i].qid = i;
2036 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2037 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2038 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2039 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2040 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2044 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
2045 run_args.num_s2m_rings;
2047 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2048 if (l0 + l1 <= buflen)
2050 md->tx_queues = (memif_queue_details_t *) buf + l0;
2054 err = MEMIF_ERR_NOBUF_DET;
2056 for (i = 0; i < md->tx_queues_num; i++)
2058 md->tx_queues[i].qid = i;
2059 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2060 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2061 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2062 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2063 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2066 md->link_up_down = (c->fd > 0) ? 1 : 0;
2072 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2074 memif_connection_t *c = (memif_connection_t *) conn;
2077 return MEMIF_ERR_NOCONN;
2079 return MEMIF_ERR_DISCONNECTED;
2081 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2082 run_args.num_m2s_rings;
2084 return MEMIF_ERR_QID;
2086 *efd = c->rx_queues[qid].int_fd;
2088 return MEMIF_ERR_SUCCESS;
2094 libmemif_main_t *lm = &libmemif_main;
2095 if (lm->control_list)
2096 free (lm->control_list);
2097 lm->control_list = NULL;
2098 if (lm->interrupt_list)
2099 free (lm->interrupt_list);
2100 lm->interrupt_list = NULL;
2101 if (lm->listener_list)
2102 free (lm->listener_list);
2103 lm->listener_list = NULL;
2104 if (lm->pending_list)
2105 free (lm->pending_list);
2106 lm->pending_list = NULL;
2107 if (poll_cancel_fd != -1)
2108 close (poll_cancel_fd);
2110 return MEMIF_ERR_SUCCESS; /* 0 */