2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
21 #include <sys/types.h>
23 #include <sys/ioctl.h>
24 #include <sys/socket.h>
28 #include <sys/prctl.h>
34 #include <linux/icmp.h>
35 #include <arpa/inet.h>
37 #include <netinet/if_ether.h>
38 #include <net/if_arp.h>
39 #include <asm/byteorder.h>
44 #include <sys/eventfd.h>
45 #include <sys/timerfd.h>
46 #include <sys/epoll.h>
48 #include <linux/memfd.h>
50 /* memif protocol msg, ring and descriptor definitions */
54 /* socket messaging functions */
56 /* private structs and functions */
57 #include <memif_private.h>
59 #define ERRLIST_LEN 40
60 #define MAX_ERRBUF_LEN 256
63 #define MEMIF_MEMORY_BARRIER() __builtin_ia32_sfence ()
65 #define MEMIF_MEMORY_BARRIER() __sync_synchronize ()
66 #endif /* __x86_x64__ */
68 libmemif_main_t libmemif_main;
70 int poll_cancel_fd = -1;
72 static char memif_buf[MAX_ERRBUF_LEN];
74 const char *memif_errlist[ERRLIST_LEN] = { /* MEMIF_ERR_SUCCESS */
76 /* MEMIF_ERR_SYSCALL */
77 "Unspecified syscall error (build with -DMEMIF_DBG or make debug).",
78 /* MEMIF_ERR_CONNREFUSED */
81 "Permission to resoure denied.",
82 /* MEMIF_ERR_NO_FILE */
83 "Socket file does not exist",
84 /* MEMIF_ERR_FILE_LIMIT */
85 "System limit on total numer of open files reached.",
86 /* MEMIF_ERR_PROC_FILE_LIMIT */
87 "Per-process limit on total number of open files reached.",
88 /* MEMIF_ERR_ALREADY */
89 "Connection already requested.",
91 "File descriptor refers to file other than socket, or operation would block.",
92 /* MEMIF_ERR_BAD_FD */
93 "Bad file descriptor.",
96 /* MEMIF_ERR_INVAL_ARG */
98 /* MEMIF_ERR_NOCONN */
99 "Memif connection handle does not point to existing conenction",
101 "Memif connection handle points to existing connection",
102 /* MEMIF_ERR_CB_FDUPDATE */
103 "Callback memif_control_fd_update_t returned error",
104 /* MEMIF_ERR_FILE_NOT_SOCK */
105 "File specified by socket filename exists and is not socket.",
106 /* MEMIF_ERR_NO_SHMFD */
107 "Missing shared memory file descriptor. (internal error)",
108 /* MEMIF_ERR_COOKIE */
109 "Invalid cookie on ring. (internal error)",
110 /* MEMIF_ERR_NOBUF_RING */
112 /* MEMIF_ERR_NOBUF */
113 "Not enough memif buffers. There are unreceived data in shared memory.",
114 /* MEMIF_ERR_NOBUF_DET */
115 "Not enough space for memif details in suplied buffer. String data might be malformed.",
116 /* MEMIF_ERR_INT_WRITE */
117 "Send interrupt error.",
118 /* MEMIF_ERR_MFMSG */
119 "Malformed message received on control channel.",
122 /* MEMIF_ERR_PROTO */
123 "Incompatible memory interface protocol version.",
125 "Unmatched interface id.",
126 /* MEMIF_ERR_ACCSLAVE */
127 "Slave cannot accept connection reqest.",
128 /* MEMIF_ERR_ALRCONN */
129 "Interface is already connected.",
132 /* MEMIF_ERR_SECRET */
134 /* MEMIF_ERR_NOSECRET */
136 /* MEMIF_ERR_MAXREG */
137 "Limit on total number of regions reached.",
138 /* MEMIF_ERR_MAXRING */
139 "Limit on total number of ring reached.",
140 /* MEMIF_ERR_NO_INTFD */
141 "Missing interrupt file descriptor. (internal error)",
142 /* MEMIF_ERR_DISCONNECT */
143 "Interface received disconnect request.",
144 /* MEMIF_ERR_DISCONNECTED */
145 "Interface is disconnected.",
146 /* MEMIF_ERR_UNKNOWN_MSG */
147 "Unknown message type received on control channel. (internal error)",
148 /* MEMIF_ERR_POLL_CANCEL */
149 "Memif event polling was canceled.",
150 /* MEMIF_ERR_MAX_RING */
151 "Maximum log2 ring size is 15",
152 /* MEMIF_ERR_PRIVHDR */
153 "Private headers not supported."
156 #define MEMIF_ERR_UNDEFINED "undefined error"
159 memif_strerror (int err_code)
161 if (err_code >= ERRLIST_LEN)
163 strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED));
164 memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0';
168 strncpy (memif_buf, memif_errlist[err_code],
169 strlen (memif_errlist[err_code]));
170 memif_buf[strlen (memif_errlist[err_code])] = '\0';
178 return MEMIF_VERSION;
181 #define DBG_TX_BUF (0)
182 #define DBG_RX_BUF (1)
186 print_bytes (void *data, uint16_t len, uint8_t q)
189 printf ("\nTX:\n\t");
191 printf ("\nRX:\n\t");
193 for (i = 0; i < len; i++)
196 printf ("\n%d:\t", i);
197 printf ("%02X ", ((uint8_t *) (data))[i]);
201 #endif /* MEMIF_DBG_SHM */
204 memif_syscall_error_handler (int err_code)
206 DBG ("%s", strerror (err_code));
209 return MEMIF_ERR_SUCCESS;
210 if (err_code == EACCES)
211 return MEMIF_ERR_ACCES;
212 if (err_code == ENFILE)
213 return MEMIF_ERR_FILE_LIMIT;
214 if (err_code == EMFILE)
215 return MEMIF_ERR_PROC_FILE_LIMIT;
216 if (err_code == ENOMEM)
217 return MEMIF_ERR_NOMEM;
218 /* connection refused if master does not exist
219 this error would spam the user until master was created */
221 if (err_code == ECONNREFUSED)
222 return MEMIF_ERR_SUCCESS;
224 if (err_code == ECONNREFUSED)
225 return MEMIF_ERR_CONNREFUSED;
226 if (err_code == EALREADY)
227 return MEMIF_ERR_ALREADY;
228 if (err_code == EAGAIN)
229 return MEMIF_ERR_AGAIN;
230 if (err_code == EBADF)
231 return MEMIF_ERR_BAD_FD;
232 if (err_code == ENOENT)
233 return MEMIF_ERR_NO_FILE;
235 /* other syscall errors */
236 return MEMIF_ERR_SYSCALL;
240 memif_add_epoll_fd (int fd, uint32_t events)
244 DBG ("invalid fd %d", fd);
247 struct epoll_event evt;
248 memset (&evt, 0, sizeof (evt));
251 if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
253 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
256 DBG ("fd %d added to epoll", fd);
261 memif_mod_epoll_fd (int fd, uint32_t events)
265 DBG ("invalid fd %d", fd);
268 struct epoll_event evt;
269 memset (&evt, 0, sizeof (evt));
272 if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
274 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
277 DBG ("fd %d moddified on epoll", fd);
282 memif_del_epoll_fd (int fd)
286 DBG ("invalid fd %d", fd);
289 struct epoll_event evt;
290 memset (&evt, 0, sizeof (evt));
291 if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
293 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
296 DBG ("fd %d removed from epoll", fd);
301 memif_control_fd_update (int fd, uint8_t events)
303 if (events & MEMIF_FD_EVENT_DEL)
304 return memif_del_epoll_fd (fd);
307 if (events & MEMIF_FD_EVENT_READ)
309 if (events & MEMIF_FD_EVENT_WRITE)
312 if (events & MEMIF_FD_EVENT_MOD)
313 return memif_mod_epoll_fd (fd, evt);
315 return memif_add_epoll_fd (fd, evt);
319 add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
321 libmemif_main_t *lm = &libmemif_main;
324 for (i = 0; i < *len; i++)
326 if ((*list)[i].data_struct == NULL)
328 (*list)[i].key = e->key;
329 (*list)[i].data_struct = e->data_struct;
333 memif_list_elt_t *tmp;
334 tmp = lm->realloc (*list, sizeof (memif_list_elt_t) * *len * 2);
338 for (i = *len; i < *len * 2; i++)
341 tmp[i].data_struct = NULL;
344 tmp[*len].key = e->key;
345 tmp[*len].data_struct = e->data_struct;
354 get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len,
363 for (i = 0; i < len; i++)
365 if (list[i].key == key)
375 /* does not free memory, only marks element as free */
377 free_list_elt (memif_list_elt_t * list, uint16_t len, int key)
380 for (i = 0; i < len; i++)
382 if (list[i].key == key)
385 list[i].data_struct = NULL;
394 free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
395 memif_connection_t * ctx)
398 for (i = 0; i < len; i++)
400 if (list[i].key == -1)
402 if (list[i].data_struct == ctx)
404 list[i].data_struct = NULL;
414 memif_control_fd_update_register (memif_control_fd_update_t * cb)
416 libmemif_main_t *lm = &libmemif_main;
417 lm->control_fd_update = cb;
421 memif_register_external_region (memif_add_external_region_t * ar,
422 memif_get_external_region_addr_t * gr,
423 memif_del_external_region_t * dr,
424 memif_get_external_buffer_offset_t * go)
426 libmemif_main_t *lm = &libmemif_main;
427 lm->add_external_region = ar;
428 lm->get_external_region_addr = gr;
429 lm->del_external_region = dr;
430 lm->get_external_buffer_offset = go;
434 memif_alloc_register (memif_alloc_t * ma)
436 libmemif_main_t *lm = &libmemif_main;
441 memif_realloc_register (memif_realloc_t * mr)
443 libmemif_main_t *lm = &libmemif_main;
448 memif_free_register (memif_free_t * mf)
450 libmemif_main_t *lm = &libmemif_main;
455 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
456 memif_alloc_t * memif_alloc, memif_realloc_t * memif_realloc,
457 memif_free_t * memif_free)
459 int err = MEMIF_ERR_SUCCESS; /* 0 */
460 libmemif_main_t *lm = &libmemif_main;
461 memset (lm, 0, sizeof (libmemif_main_t));
463 if (memif_alloc != NULL)
465 memif_alloc_register (memif_alloc);
468 memif_alloc_register (malloc);
470 if (memif_realloc != NULL)
472 memif_realloc_register (memif_realloc);
475 memif_realloc_register (realloc);
477 if (memif_free != NULL)
478 memif_free_register (memif_free);
480 memif_free_register (free);
482 if (app_name != NULL)
484 uint8_t len = (strlen (app_name) > MEMIF_NAME_LEN)
485 ? strlen (app_name) : MEMIF_NAME_LEN;
486 strncpy ((char *) lm->app_name, app_name, len);
490 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
491 strlen (MEMIF_DEFAULT_APP_NAME));
494 /* register control fd update callback */
495 if (on_control_fd_update != NULL)
496 memif_control_fd_update_register (on_control_fd_update);
499 memif_epfd = epoll_create (1);
500 memif_control_fd_update_register (memif_control_fd_update);
501 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
504 DBG ("eventfd: %s", strerror (err));
505 return memif_syscall_error_handler (err);
507 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ);
508 DBG ("libmemif event polling initialized");
511 lm->control_list_len = 2;
512 lm->interrupt_list_len = 2;
513 lm->listener_list_len = 1;
514 lm->pending_list_len = 1;
517 lm->alloc (sizeof (memif_list_elt_t) * lm->control_list_len);
518 if (lm->control_list == NULL)
520 err = MEMIF_ERR_NOMEM;
524 lm->alloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
525 if (lm->interrupt_list == NULL)
527 err = MEMIF_ERR_NOMEM;
531 lm->alloc (sizeof (memif_list_elt_t) * lm->listener_list_len);
532 if (lm->listener_list == NULL)
534 err = MEMIF_ERR_NOMEM;
538 lm->alloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
539 if (lm->pending_list == NULL)
541 err = MEMIF_ERR_NOMEM;
546 for (i = 0; i < lm->control_list_len; i++)
548 lm->control_list[i].key = -1;
549 lm->control_list[i].data_struct = NULL;
551 for (i = 0; i < lm->interrupt_list_len; i++)
553 lm->interrupt_list[i].key = -1;
554 lm->interrupt_list[i].data_struct = NULL;
556 for (i = 0; i < lm->listener_list_len; i++)
558 lm->listener_list[i].key = -1;
559 lm->listener_list[i].data_struct = NULL;
561 for (i = 0; i < lm->pending_list_len; i++)
563 lm->pending_list[i].key = -1;
564 lm->pending_list[i].data_struct = NULL;
567 lm->disconn_slaves = 0;
569 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
572 err = memif_syscall_error_handler (errno);
576 lm->arm.it_value.tv_sec = 2;
577 lm->arm.it_value.tv_nsec = 0;
578 lm->arm.it_interval.tv_sec = 2;
579 lm->arm.it_interval.tv_nsec = 0;
581 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
583 DBG ("callback type memif_control_fd_update_t error!");
584 err = MEMIF_ERR_CB_FDUPDATE;
595 static inline memif_ring_t *
596 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
599 if (&conn->regions[0] == NULL)
601 void *p = conn->regions[0].addr;
603 sizeof (memif_ring_t) +
604 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
605 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
607 return (memif_ring_t *) p;
611 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
614 memif_connection_t *conn = (memif_connection_t *) c;
616 return MEMIF_ERR_NOCONN;
618 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->
619 run_args.num_m2s_rings;
621 return MEMIF_ERR_QID;
623 conn->rx_queues[qid].ring->flags = rx_mode;
624 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
625 return MEMIF_ERR_SUCCESS;
629 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
630 memif_connection_update_t * on_connect,
631 memif_connection_update_t * on_disconnect,
632 memif_interrupt_t * on_interrupt, void *private_ctx)
634 libmemif_main_t *lm = &libmemif_main;
635 int err, i, index = 0, sockfd = -1;
636 memif_list_elt_t list_elt;
637 memif_connection_t *conn = (memif_connection_t *) * c;
640 DBG ("This handle already points to existing memif.");
641 return MEMIF_ERR_CONN;
643 conn = (memif_connection_t *) lm->alloc (sizeof (memif_connection_t));
646 err = MEMIF_ERR_NOMEM;
649 memset (conn, 0, sizeof (memif_connection_t));
651 conn->args.interface_id = args->interface_id;
653 if (args->log2_ring_size == 0)
654 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
655 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
657 err = MEMIF_ERR_MAX_RING;
660 if (args->buffer_size == 0)
661 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
662 if (args->num_s2m_rings == 0)
663 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
664 if (args->num_m2s_rings == 0)
665 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
667 conn->args.num_s2m_rings = args->num_s2m_rings;
668 conn->args.num_m2s_rings = args->num_m2s_rings;
669 conn->args.buffer_size = args->buffer_size;
670 conn->args.log2_ring_size = args->log2_ring_size;
671 conn->args.is_master = args->is_master;
672 conn->args.mode = args->mode;
673 conn->msg_queue = NULL;
674 conn->regions = NULL;
675 conn->tx_queues = NULL;
676 conn->rx_queues = NULL;
678 conn->on_connect = on_connect;
679 conn->on_disconnect = on_disconnect;
680 conn->on_interrupt = on_interrupt;
681 conn->private_ctx = private_ctx;
682 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
684 uint8_t l = strlen ((char *) args->interface_name);
685 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
688 /* allocate and initialize socket_filename so it can be copyed to sun_path
689 without memory leaks */
690 conn->args.socket_filename = lm->alloc (sizeof (char *) * 108);
691 if (conn->args.socket_filename == NULL)
693 err = MEMIF_ERR_NOMEM;
696 memset (conn->args.socket_filename, 0, 108 * sizeof (char *));
698 if (args->socket_filename)
700 if (conn->args.socket_filename == NULL)
702 err = memif_syscall_error_handler (errno);
705 strncpy ((char *) conn->args.socket_filename,
706 (char *) args->socket_filename,
707 strlen ((char *) args->socket_filename));
711 uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR);
712 uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME);
713 if (conn->args.socket_filename == NULL)
715 err = memif_syscall_error_handler (errno);
718 strncpy ((char *) conn->args.socket_filename,
719 MEMIF_DEFAULT_SOCKET_DIR, sdl);
720 conn->args.socket_filename[sdl] = '/';
721 strncpy ((char *) (conn->args.socket_filename + 1 + sdl),
722 MEMIF_DEFAULT_SOCKET_FILENAME, sfl);
725 if ((l = strlen ((char *) args->secret)) > 0)
727 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
730 if (conn->args.is_master)
732 conn->run_args.buffer_size = conn->args.buffer_size;
734 memif_list_elt_t elt;
735 for (i = 0; i < lm->listener_list_len; i++)
738 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
741 ((char *) ms->filename, (char *) conn->args.socket_filename,
742 strlen ((char *) ms->filename)) == 0)
744 /* add interface to listener socket */
745 elt.key = conn->args.interface_id;
746 *c = elt.data_struct = conn;
747 add_list_elt (&elt, &ms->interface_list,
748 &ms->interface_list_len);
750 conn->listener_fd = ms->fd;
756 struct stat file_stat;
757 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
759 if (S_ISSOCK (file_stat.st_mode))
760 unlink ((char *) conn->args.socket_filename);
762 return memif_syscall_error_handler (errno);
764 DBG ("creating socket file");
765 ms = lm->alloc (sizeof (memif_socket_t));
768 err = MEMIF_ERR_NOMEM;
772 lm->alloc (strlen ((char *) conn->args.socket_filename) +
774 if (ms->filename == NULL)
776 err = MEMIF_ERR_NOMEM;
779 memset (ms->filename, 0,
780 strlen ((char *) conn->args.socket_filename) +
782 strncpy ((char *) ms->filename,
783 (char *) conn->args.socket_filename,
784 strlen ((char *) conn->args.socket_filename));
785 ms->interface_list_len = 1;
787 lm->alloc (sizeof (memif_list_elt_t) *
788 ms->interface_list_len);
789 if (ms->interface_list == NULL)
791 err = MEMIF_ERR_NOMEM;
794 ms->interface_list[0].key = -1;
795 ms->interface_list[0].data_struct = NULL;
796 struct sockaddr_un un = { 0 };
799 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
802 err = memif_syscall_error_handler (errno);
805 DBG ("socket %d created", ms->fd);
806 un.sun_family = AF_UNIX;
807 strncpy ((char *) un.sun_path, (char *) ms->filename,
808 sizeof (un.sun_path) - 1);
811 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
813 err = memif_syscall_error_handler (errno);
817 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
819 err = memif_syscall_error_handler (errno);
823 if (listen (ms->fd, 1) < 0)
825 err = memif_syscall_error_handler (errno);
829 if (stat ((char *) ms->filename, &file_stat) < 0)
831 err = memif_syscall_error_handler (errno);
835 /* add interface to listener socket */
836 elt.key = conn->args.interface_id;
837 *c = elt.data_struct = conn;
838 add_list_elt (&elt, &ms->interface_list,
839 &ms->interface_list_len);
841 conn->listener_fd = ms->fd;
843 /* add listener socket to libmemif main */
845 elt.data_struct = ms;
846 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
847 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
854 if (lm->disconn_slaves == 0)
856 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
858 err = memif_syscall_error_handler (errno);
863 lm->disconn_slaves++;
866 *c = list_elt.data_struct = conn;
868 add_list_elt (&list_elt, &lm->control_list,
869 &lm->control_list_len)) < 0)
871 err = MEMIF_ERR_NOMEM;
884 if (conn->args.socket_filename)
885 lm->free (conn->args.socket_filename);
893 memif_control_fd_handler (int fd, uint8_t events)
895 int i, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */
897 memif_list_elt_t *e = NULL;
898 memif_connection_t *conn;
899 libmemif_main_t *lm = &libmemif_main;
900 if (fd == lm->timerfd)
904 size = read (fd, &b, sizeof (b));
909 for (i = 0; i < lm->control_list_len; i++)
911 if ((lm->control_list[i].key < 0)
912 && (lm->control_list[i].data_struct != NULL))
914 conn = lm->control_list[i].data_struct;
915 if (conn->args.is_master)
918 struct sockaddr_un sun;
919 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
922 err = memif_syscall_error_handler (errno);
926 sun.sun_family = AF_UNIX;
928 strncpy (sun.sun_path, (char *) conn->args.socket_filename,
929 sizeof (sun.sun_path) - 1);
931 if (connect (sockfd, (struct sockaddr *) &sun,
932 sizeof (struct sockaddr_un)) == 0)
935 conn->read_fn = memif_conn_fd_read_ready;
936 conn->write_fn = memif_conn_fd_write_ready;
937 conn->error_fn = memif_conn_fd_error;
939 lm->control_list[conn->index].key = conn->fd;
941 lm->control_fd_update (sockfd,
942 MEMIF_FD_EVENT_READ |
943 MEMIF_FD_EVENT_WRITE);
945 lm->disconn_slaves--;
946 if (lm->disconn_slaves == 0)
948 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL)
951 err = memif_syscall_error_handler (errno);
958 strcpy ((char *) conn->remote_disconnect_string,
959 memif_strerror (memif_syscall_error_handler
967 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
970 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
973 (((memif_connection_t *) e->data_struct)->
974 args.is_master) ? ((memif_connection_t *) e->
975 data_struct)->run_args.
976 num_s2m_rings : ((memif_connection_t *) e->data_struct)->
977 run_args.num_m2s_rings;
978 for (i = 0; i < num; i++)
980 if (((memif_connection_t *) e->data_struct)->
981 rx_queues[i].int_fd == fd)
983 ((memif_connection_t *) e->data_struct)->
984 on_interrupt ((void *) e->data_struct,
985 ((memif_connection_t *) e->
986 data_struct)->private_ctx, i);
987 return MEMIF_ERR_SUCCESS;
991 return MEMIF_ERR_SUCCESS;
993 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
996 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
997 return MEMIF_ERR_SUCCESS;
1000 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
1003 memif_read_ready (fd);
1004 return MEMIF_ERR_SUCCESS;
1007 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
1010 if (events & MEMIF_FD_EVENT_READ)
1013 ((memif_connection_t *) e->data_struct)->
1014 read_fn (e->data_struct);
1015 if (err != MEMIF_ERR_SUCCESS)
1018 if (events & MEMIF_FD_EVENT_WRITE)
1021 ((memif_connection_t *) e->data_struct)->
1022 write_fn (e->data_struct);
1023 if (err != MEMIF_ERR_SUCCESS)
1026 if (events & MEMIF_FD_EVENT_ERROR)
1029 ((memif_connection_t *) e->data_struct)->
1030 error_fn (e->data_struct);
1031 if (err != MEMIF_ERR_SUCCESS)
1037 return MEMIF_ERR_SUCCESS; /* 0 */
1047 memif_poll_event (int timeout)
1049 struct epoll_event evt;
1050 int en = 0, err = MEMIF_ERR_SUCCESS; /* 0 */
1051 uint32_t events = 0;
1052 uint64_t counter = 0;
1054 memset (&evt, 0, sizeof (evt));
1055 evt.events = EPOLLIN | EPOLLOUT;
1057 sigemptyset (&sigset);
1058 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
1062 DBG ("epoll_pwait: %s", strerror (err));
1063 return memif_syscall_error_handler (err);
1067 if (evt.data.fd == poll_cancel_fd)
1069 r = read (evt.data.fd, &counter, sizeof (counter));
1071 return MEMIF_ERR_DISCONNECTED;
1073 return MEMIF_ERR_POLL_CANCEL;
1075 if (evt.events & EPOLLIN)
1076 events |= MEMIF_FD_EVENT_READ;
1077 if (evt.events & EPOLLOUT)
1078 events |= MEMIF_FD_EVENT_WRITE;
1079 if (evt.events & EPOLLERR)
1080 events |= MEMIF_FD_EVENT_ERROR;
1081 err = memif_control_fd_handler (evt.data.fd, events);
1088 memif_cancel_poll_event ()
1090 uint64_t counter = 1;
1093 if (poll_cancel_fd == -1)
1095 w = write (poll_cancel_fd, &counter, sizeof (counter));
1096 if (w < sizeof (counter))
1097 return MEMIF_ERR_INT_WRITE;
1103 memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
1107 memif_msg_queue_free (lm, &(*e)->next);
1113 /* send disconnect msg and close interface */
1115 memif_disconnect_internal (memif_connection_t * c)
1119 DBG ("no connection");
1120 return MEMIF_ERR_NOCONN;
1123 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1125 libmemif_main_t *lm = &libmemif_main;
1126 memif_list_elt_t *e;
1128 c->on_disconnect ((void *) c, c->private_ctx);
1132 memif_msg_send_disconnect (c->fd, (uint8_t *) "interface deleted", 0);
1133 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1136 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1139 if (c->args.is_master)
1140 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1141 e->key = c->fd = -1;
1144 if (c->tx_queues != NULL)
1147 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1148 run_args.num_s2m_rings;
1149 for (i = 0; i < num; i++)
1151 mq = &c->tx_queues[i];
1156 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1161 lm->free (c->tx_queues);
1162 c->tx_queues = NULL;
1165 if (c->rx_queues != NULL)
1168 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1169 run_args.num_m2s_rings;
1170 for (i = 0; i < num; i++)
1172 mq = &c->rx_queues[i];
1177 if (c->on_interrupt != NULL)
1178 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1181 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1186 lm->free (c->rx_queues);
1187 c->rx_queues = NULL;
1190 for (i = 0; i < c->regions_num; i++)
1192 if (&c->regions[i] == NULL)
1194 if (c->regions[i].is_external != 0)
1196 lm->del_external_region (c->regions[i].addr,
1197 c->regions[i].region_size,
1198 c->regions[i].fd, c->private_ctx);
1202 if (munmap (c->regions[i].addr, c->regions[i].region_size) < 0)
1203 return memif_syscall_error_handler (errno);
1204 if (c->regions[i].fd > 0)
1205 close (c->regions[i].fd);
1206 c->regions[i].fd = -1;
1209 lm->free (c->regions);
1213 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1215 memif_msg_queue_free (lm, &c->msg_queue);
1217 if (!(c->args.is_master))
1219 if (lm->disconn_slaves == 0)
1221 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1223 err = memif_syscall_error_handler (errno);
1224 DBG ("timerfd_settime: arm");
1227 lm->disconn_slaves++;
1234 memif_delete (memif_conn_handle_t * conn)
1236 memif_connection_t *c = (memif_connection_t *) * conn;
1239 DBG ("no connection");
1240 return MEMIF_ERR_NOCONN;
1242 libmemif_main_t *lm = &libmemif_main;
1243 memif_list_elt_t *e = NULL;
1244 memif_socket_t *ms = NULL;
1246 int err = MEMIF_ERR_SUCCESS;
1250 DBG ("DISCONNECTING");
1251 err = memif_disconnect_internal (c);
1252 if (err == MEMIF_ERR_NOCONN)
1256 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1258 if (c->args.is_master)
1260 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1264 ms = (memif_socket_t *) e->data_struct;
1266 free_list_elt (ms->interface_list, ms->interface_list_len,
1267 c->args.interface_id);
1268 if (ms->use_count <= 0)
1270 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1271 free_list_elt (lm->listener_list, lm->listener_list_len,
1273 close (c->listener_fd);
1274 c->listener_fd = ms->fd = -1;
1275 lm->free (ms->interface_list);
1276 ms->interface_list = NULL;
1277 lm->free (ms->filename);
1278 ms->filename = NULL;
1286 lm->disconn_slaves--;
1287 if (lm->disconn_slaves <= 0)
1289 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1291 err = memif_syscall_error_handler (errno);
1292 DBG ("timerfd_settime: disarm");
1297 if (c->args.socket_filename)
1298 lm->free (c->args.socket_filename);
1299 c->args.socket_filename = NULL;
1309 memif_connect1 (memif_connection_t * c)
1311 libmemif_main_t *lm = &libmemif_main;
1316 for (i = 0; i < c->regions_num; i++)
1318 mr = &c->regions[i];
1323 if (mr->is_external)
1325 if (lm->get_external_region_addr == NULL)
1326 return 99; /* FIXME: proper error report */
1328 lm->get_external_region_addr (mr->region_size, mr->fd,
1334 return MEMIF_ERR_NO_SHMFD;
1337 mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1338 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1340 return memif_syscall_error_handler (errno);
1347 for (i = 0; i < c->rx_queues_num; i++)
1349 mq = &c->rx_queues[i];
1352 mq->ring = c->regions[mq->region].addr + mq->offset;
1353 if (mq->ring->cookie != MEMIF_COOKIE)
1355 DBG ("wrong cookie on rx ring %u", i);
1356 return MEMIF_ERR_COOKIE;
1358 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1363 for (i = 0; i < c->tx_queues_num; i++)
1365 mq = &c->tx_queues[i];
1368 mq->ring = c->regions[mq->region].addr + mq->offset;
1369 if (mq->ring->cookie != MEMIF_COOKIE)
1371 DBG ("wrong cookie on tx ring %u", i);
1372 return MEMIF_ERR_COOKIE;
1374 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1379 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1385 memif_add_region (libmemif_main_t * lm, memif_connection_t * conn,
1386 uint8_t has_buffers)
1391 lm->realloc (conn->regions,
1392 sizeof (memif_region_t) * ++conn->regions_num);
1394 return MEMIF_ERR_NOMEM;
1397 r = &conn->regions[conn->regions_num - 1];
1398 memset (r, 0, sizeof (memif_region_t));
1400 if (has_buffers != 0)
1402 r->buffer_offset = 0;
1407 (conn->run_args.num_s2m_rings +
1408 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1409 sizeof (memif_desc_t) *
1411 run_args.log2_ring_size));
1414 r->region_size = (has_buffers == 0) ? r->buffer_offset : r->buffer_offset +
1415 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1416 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1418 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1419 return memif_syscall_error_handler (errno);
1421 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1422 return memif_syscall_error_handler (errno);
1424 if ((ftruncate (r->fd, r->region_size)) == -1)
1425 return memif_syscall_error_handler (errno);
1427 if ((r->addr = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1428 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1429 return memif_syscall_error_handler (errno);
1431 return MEMIF_ERR_SUCCESS;
1435 memif_init_queues (libmemif_main_t * lm, memif_connection_t * conn)
1440 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1442 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1443 DBG ("RING: %p I: %d", ring, i);
1444 ring->head = ring->tail = 0;
1445 ring->cookie = MEMIF_COOKIE;
1447 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1449 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1450 ring->desc[j].region = 1;
1451 ring->desc[j].offset =
1452 conn->regions[1].buffer_offset +
1453 (uint32_t) (slot * conn->run_args.buffer_size);
1454 ring->desc[j].length = conn->run_args.buffer_size;
1457 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1459 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1460 DBG ("RING: %p I: %d", ring, i);
1461 ring->head = ring->tail = 0;
1462 ring->cookie = MEMIF_COOKIE;
1464 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1466 uint16_t slot = (i + conn->run_args.num_s2m_rings) *
1467 (1 << conn->run_args.log2_ring_size) + j;
1468 ring->desc[j].region = 1;
1469 ring->desc[j].offset =
1470 conn->regions[1].buffer_offset +
1471 (uint32_t) (slot * conn->run_args.buffer_size);
1472 ring->desc[j].length = conn->run_args.buffer_size;
1476 DBG ("alloc: %p", lm->alloc);
1477 DBG ("size: %lu", sizeof (memif_queue_t) * conn->run_args.num_s2m_rings);
1479 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1480 conn->run_args.num_s2m_rings);
1482 return MEMIF_ERR_NOMEM;
1486 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1488 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1489 return memif_syscall_error_handler (errno);
1490 e.key = mq[x].int_fd;
1491 e.data_struct = conn;
1492 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1494 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1495 DBG ("RING: %p I: %d", mq[x].ring, x);
1496 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1499 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1500 mq[x].last_head = mq[x].last_tail = 0;
1501 mq[x].alloc_bufs = 0;
1503 conn->tx_queues = mq;
1506 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1507 conn->run_args.num_m2s_rings);
1509 return MEMIF_ERR_NOMEM;
1511 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1513 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1514 return memif_syscall_error_handler (errno);
1515 e.key = mq[x].int_fd;
1516 e.data_struct = conn;
1517 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1519 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1520 DBG ("RING: %p I: %d", mq[x].ring, x);
1521 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1524 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1525 mq[x].last_head = mq[x].last_tail = 0;
1526 mq[x].alloc_bufs = 0;
1528 conn->rx_queues = mq;
1530 return MEMIF_ERR_SUCCESS;
1534 memif_init_regions_and_queues (memif_connection_t * conn)
1537 libmemif_main_t *lm = &libmemif_main;
1539 /* region 0. rings */
1540 memif_add_region (lm, conn, /* has_buffers */ 0);
1542 /* region 1. buffers */
1543 if (lm->add_external_region)
1546 (memif_region_t *) lm->realloc (conn->regions,
1547 sizeof (memif_region_t) *
1548 ++conn->regions_num);
1550 return MEMIF_ERR_NOMEM;
1553 conn->regions[1].region_size =
1554 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1555 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1556 conn->regions[1].buffer_offset = 0;
1557 lm->add_external_region (&conn->regions[1].addr,
1558 conn->regions[1].region_size,
1559 &conn->regions[1].fd, conn->private_ctx);
1560 conn->regions[1].is_external = 1;
1564 memif_add_region (lm, conn, 1);
1567 memif_init_queues (lm, conn);
1573 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1574 memif_buffer_t * bufs, uint16_t count,
1575 uint16_t * count_out)
1577 memif_connection_t *c = (memif_connection_t *) conn;
1578 if (EXPECT_FALSE (c == NULL))
1579 return MEMIF_ERR_NOCONN;
1580 if (EXPECT_FALSE (c->fd < 0))
1581 return MEMIF_ERR_DISCONNECTED;
1583 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1584 run_args.num_s2m_rings;
1585 if (EXPECT_FALSE (qid >= num))
1586 return MEMIF_ERR_QID;
1587 if (EXPECT_FALSE (!count_out))
1588 return MEMIF_ERR_INVAL_ARG;
1589 if (EXPECT_FALSE (c->args.is_master))
1590 return MEMIF_ERR_INVAL_ARG;
1592 memif_queue_t *mq = &c->tx_queues[qid];
1593 memif_ring_t *ring = mq->ring;
1595 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1598 int err = MEMIF_ERR_SUCCESS; /* 0 */
1601 ring_size = (1 << mq->log2_ring_size);
1602 slot = (c->args.is_master) ? ring->tail : ring->head;
1603 slot += mq->alloc_bufs;
1605 /* can only be called by slave */
1606 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1612 if (EXPECT_FALSE ((b0->flags & MEMIF_BUFFER_FLAG_RX) == 0))
1614 /* not a valid buffer */
1618 b0->flags &= ~MEMIF_BUFFER_FLAG_RX;
1620 ((memif_ring_t *) b0->ring)->desc[b0->desc_index & mask].offset = ring->desc[slot & mask].offset; /* put free buffer on rx ring */
1622 ring->desc[slot & mask].offset =
1623 (uint32_t) (b0->data -
1624 c->regions[ring->desc[slot & mask].region].addr);
1625 ring->desc[slot & mask].flags |=
1626 (b0->flags & MEMIF_BUFFER_FLAG_NEXT) ? MEMIF_DESC_FLAG_NEXT : 0;
1628 b0->desc_index = slot;
1639 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1644 DBG ("ring buffer full! qid: %u", qid);
1645 err = MEMIF_ERR_NOBUF_RING;
1652 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1653 memif_buffer_t * bufs, uint16_t count,
1654 uint16_t * count_out, uint16_t size)
1656 memif_connection_t *c = (memif_connection_t *) conn;
1657 if (EXPECT_FALSE (c == NULL))
1658 return MEMIF_ERR_NOCONN;
1659 if (EXPECT_FALSE (c->fd < 0))
1660 return MEMIF_ERR_DISCONNECTED;
1662 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1663 run_args.num_s2m_rings;
1664 if (EXPECT_FALSE (qid >= num))
1665 return MEMIF_ERR_QID;
1666 if (EXPECT_FALSE (!count_out))
1667 return MEMIF_ERR_INVAL_ARG;
1669 libmemif_main_t *lm = &libmemif_main;
1670 memif_queue_t *mq = &c->tx_queues[qid];
1671 memif_ring_t *ring = mq->ring;
1673 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1674 uint32_t offset_mask = c->run_args.buffer_size - 1;
1677 int err = MEMIF_ERR_SUCCESS; /* 0 */
1678 uint16_t dst_left, src_left;
1679 uint16_t saved_count;
1680 memif_buffer_t *saved_b;
1683 ring_size = (1 << mq->log2_ring_size);
1684 slot = (c->args.is_master) ? ring->tail : ring->head;
1685 slot += mq->alloc_bufs;
1687 if (c->args.is_master)
1688 ns = ring->head - (ring->tail + mq->alloc_bufs);
1690 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1694 b0 = (bufs + *count_out);
1697 saved_count = count;
1699 b0->desc_index = slot;
1700 ring->desc[slot & mask].flags = 0;
1702 /* slave can produce buffer with original length */
1703 dst_left = (c->args.is_master) ? ring->desc[slot & mask].length :
1704 c->run_args.buffer_size;
1709 if (EXPECT_FALSE (dst_left == 0))
1718 ring->desc[b0->desc_index & mask].flags |=
1719 MEMIF_DESC_FLAG_NEXT;
1720 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1722 b0 = (bufs + *count_out);
1723 b0->desc_index = slot;
1725 (c->args.is_master) ? ring->desc[slot & mask].
1726 length : c->run_args.buffer_size;
1727 ring->desc[slot & mask].flags = 0;
1731 /* rollback allocated chain buffers */
1732 memset (saved_b, 0, sizeof (memif_buffer_t)
1733 * (saved_count - count + 1));
1734 *count_out -= saved_count - count;
1735 mq->alloc_bufs = saved_count - count;
1739 b0->len = memif_min (dst_left, src_left);
1741 /* slave resets buffer offset */
1742 if (c->args.is_master == 0)
1744 memif_desc_t *d = &ring->desc[slot & mask];
1745 if (lm->get_external_buffer_offset)
1746 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1748 d->offset = d->offset - (d->offset & offset_mask);
1750 b0->data = memif_get_buffer (c, ring, slot & mask);
1752 src_left -= b0->len;
1753 dst_left -= b0->len;
1765 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1770 DBG ("ring buffer full! qid: %u", qid);
1771 err = MEMIF_ERR_NOBUF_RING;
1778 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1781 memif_connection_t *c = (memif_connection_t *) conn;
1782 if (EXPECT_FALSE (c == NULL))
1783 return MEMIF_ERR_NOCONN;
1784 if (EXPECT_FALSE (c->fd < 0))
1785 return MEMIF_ERR_DISCONNECTED;
1787 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1788 run_args.num_m2s_rings;
1789 if (EXPECT_FALSE (qid >= num))
1790 return MEMIF_ERR_QID;
1791 libmemif_main_t *lm = &libmemif_main;
1792 memif_queue_t *mq = &c->rx_queues[qid];
1793 memif_ring_t *ring = mq->ring;
1794 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1795 uint32_t offset_mask = c->run_args.buffer_size - 1;
1798 if (c->args.is_master)
1800 MEMIF_MEMORY_BARRIER ();
1802 (ring->tail + count <=
1803 mq->last_head) ? ring->tail + count : mq->last_head;
1804 return MEMIF_ERR_SUCCESS;
1807 uint16_t head = ring->head;
1808 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1809 head += (count < ns) ? count : ns;
1815 d = &ring->desc[slot & mask];
1817 d->length = c->run_args.buffer_size - headroom;
1818 if (lm->get_external_buffer_offset)
1819 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1821 d->offset = d->offset - (d->offset & offset_mask) + headroom;
1825 MEMIF_MEMORY_BARRIER ();
1828 return MEMIF_ERR_SUCCESS; /* 0 */
1832 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1833 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1835 memif_connection_t *c = (memif_connection_t *) conn;
1836 if (EXPECT_FALSE (c == NULL))
1837 return MEMIF_ERR_NOCONN;
1838 if (EXPECT_FALSE (c->fd < 0))
1839 return MEMIF_ERR_DISCONNECTED;
1841 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1842 run_args.num_s2m_rings;
1843 if (EXPECT_FALSE (qid >= num))
1844 return MEMIF_ERR_QID;
1845 if (EXPECT_FALSE (!tx))
1846 return MEMIF_ERR_INVAL_ARG;
1848 memif_queue_t *mq = &c->tx_queues[qid];
1849 memif_ring_t *ring = mq->ring;
1850 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1854 if (count > mq->alloc_bufs)
1855 count = mq->alloc_bufs;
1857 if (EXPECT_FALSE (count == 0))
1858 return MEMIF_ERR_SUCCESS;
1863 ring->desc[b0->desc_index & mask].length = b0->len;
1865 #ifdef MEMIF_DBG_SHM
1866 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1867 printf ("data: %p\n",
1868 memif_get_buffer (c, ring, b0->desc_index & mask));
1869 printf ("index: %u\n", b0->desc_index);
1870 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1871 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1872 #endif /* MEMIF_DBG_SHM */
1879 MEMIF_MEMORY_BARRIER ();
1880 if (c->args.is_master)
1881 ring->tail = b0->desc_index + 1;
1883 ring->head = b0->desc_index + 1;
1885 mq->alloc_bufs -= *tx;
1887 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1890 int r = write (mq->int_fd, &a, sizeof (a));
1892 return MEMIF_ERR_INT_WRITE;
1895 return MEMIF_ERR_SUCCESS; /* 0 */
1899 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1900 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1902 memif_connection_t *c = (memif_connection_t *) conn;
1903 if (EXPECT_FALSE (c == NULL))
1904 return MEMIF_ERR_NOCONN;
1905 if (EXPECT_FALSE (c->fd < 0))
1906 return MEMIF_ERR_DISCONNECTED;
1908 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1909 run_args.num_m2s_rings;
1910 if (EXPECT_FALSE (qid >= num))
1911 return MEMIF_ERR_QID;
1912 if (EXPECT_FALSE (!rx))
1913 return MEMIF_ERR_INVAL_ARG;
1915 memif_queue_t *mq = &c->rx_queues[qid];
1916 memif_ring_t *ring = mq->ring;
1917 uint16_t cur_slot, last_slot;
1919 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1924 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1925 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1926 return memif_syscall_error_handler (errno);
1928 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1929 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1930 if (cur_slot == last_slot)
1931 return MEMIF_ERR_SUCCESS;
1933 ns = last_slot - cur_slot;
1939 b0->desc_index = cur_slot;
1940 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1941 b0->len = ring->desc[cur_slot & mask].length;
1942 /* slave resets buffer length */
1943 if (c->args.is_master == 0)
1945 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1948 b0->flags = MEMIF_BUFFER_FLAG_RX;
1949 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1951 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1952 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1954 /* b0->offset = ring->desc[cur_slot & mask].offset;*/
1956 #ifdef MEMIF_DBG_SHM
1957 printf ("data: %p\n", b0->data);
1958 printf ("index: %u\n", b0->desc_index);
1959 printf ("ring: %p\n", b0->ring);
1960 print_bytes (b0->data, b0->len, DBG_RX_BUF);
1961 #endif /* MEMIF_DBG_SHM */
1969 if (c->args.is_master)
1970 mq->last_head = cur_slot;
1972 mq->last_tail = cur_slot;
1976 DBG ("not enough buffers!");
1977 return MEMIF_ERR_NOBUF;
1980 return MEMIF_ERR_SUCCESS; /* 0 */
1984 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1985 char *buf, ssize_t buflen)
1987 libmemif_main_t *lm = &libmemif_main;
1988 memif_connection_t *c = (memif_connection_t *) conn;
1990 return MEMIF_ERR_NOCONN;
1992 int err = MEMIF_ERR_SUCCESS, i;
1996 l1 = strlen ((char *) c->args.interface_name);
1997 if (l0 + l1 < buflen)
2000 (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
2004 err = MEMIF_ERR_NOBUF_DET;
2006 l1 = strlen ((char *) lm->app_name);
2007 if (l0 + l1 < buflen)
2009 md->inst_name = (uint8_t *) strcpy (buf + l0, (char *) lm->app_name);
2013 err = MEMIF_ERR_NOBUF_DET;
2015 l1 = strlen ((char *) c->remote_if_name);
2016 if (l0 + l1 < buflen)
2018 md->remote_if_name =
2019 (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
2023 err = MEMIF_ERR_NOBUF_DET;
2025 l1 = strlen ((char *) c->remote_name);
2026 if (l0 + l1 < buflen)
2028 md->remote_inst_name =
2029 (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
2033 err = MEMIF_ERR_NOBUF_DET;
2035 md->id = c->args.interface_id;
2037 if (strlen ((char *) c->args.secret) > 0)
2039 l1 = strlen ((char *) c->args.secret);
2040 if (l0 + l1 < buflen)
2042 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
2046 err = MEMIF_ERR_NOBUF_DET;
2049 md->role = (c->args.is_master) ? 0 : 1;
2050 md->mode = c->args.mode;
2052 l1 = strlen ((char *) c->args.socket_filename);
2053 if (l0 + l1 < buflen)
2055 md->socket_filename =
2056 (uint8_t *) strcpy (buf + l0, (char *) c->args.socket_filename);
2060 err = MEMIF_ERR_NOBUF_DET;
2062 l1 = strlen ((char *) c->remote_disconnect_string);
2063 if (l0 + l1 < buflen)
2066 (uint8_t *) strcpy (buf + l0, (char *) c->remote_disconnect_string);
2070 err = MEMIF_ERR_NOBUF_DET;
2072 md->regions_num = c->regions_num;
2073 l1 = sizeof (memif_region_details_t) * md->regions_num;
2074 if (l0 + l1 <= buflen)
2076 md->regions = (memif_region_details_t *) buf + l0;
2080 err = MEMIF_ERR_NOBUF_DET;
2082 for (i = 0; i < md->regions_num; i++)
2084 md->regions[i].index = i;
2085 md->regions[i].addr = c->regions[i].addr;
2086 md->regions[i].size = c->regions[i].region_size;
2087 md->regions[i].fd = c->regions[i].fd;
2088 md->regions[i].is_external = c->regions[i].is_external;
2092 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2093 run_args.num_m2s_rings;
2095 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
2096 if (l0 + l1 <= buflen)
2098 md->rx_queues = (memif_queue_details_t *) buf + l0;
2102 err = MEMIF_ERR_NOBUF_DET;
2104 for (i = 0; i < md->rx_queues_num; i++)
2106 md->rx_queues[i].region = c->rx_queues[i].region;
2107 md->rx_queues[i].qid = i;
2108 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2109 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2110 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2111 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2112 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2116 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
2117 run_args.num_s2m_rings;
2119 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2120 if (l0 + l1 <= buflen)
2122 md->tx_queues = (memif_queue_details_t *) buf + l0;
2126 err = MEMIF_ERR_NOBUF_DET;
2128 for (i = 0; i < md->tx_queues_num; i++)
2130 md->tx_queues[i].region = c->tx_queues[i].region;
2131 md->tx_queues[i].qid = i;
2132 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2133 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2134 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2135 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2136 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2139 md->link_up_down = (c->fd > 0) ? 1 : 0;
2145 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2147 memif_connection_t *c = (memif_connection_t *) conn;
2150 return MEMIF_ERR_NOCONN;
2152 return MEMIF_ERR_DISCONNECTED;
2154 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2155 run_args.num_m2s_rings;
2157 return MEMIF_ERR_QID;
2159 *efd = c->rx_queues[qid].int_fd;
2161 return MEMIF_ERR_SUCCESS;
2167 libmemif_main_t *lm = &libmemif_main;
2168 if (lm->control_list)
2169 lm->free (lm->control_list);
2170 lm->control_list = NULL;
2171 if (lm->interrupt_list)
2172 lm->free (lm->interrupt_list);
2173 lm->interrupt_list = NULL;
2174 if (lm->listener_list)
2175 lm->free (lm->listener_list);
2176 lm->listener_list = NULL;
2177 if (lm->pending_list)
2178 lm->free (lm->pending_list);
2179 lm->pending_list = NULL;
2180 if (poll_cancel_fd != -1)
2181 close (poll_cancel_fd);
2183 return MEMIF_ERR_SUCCESS; /* 0 */