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 39
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).",
79 "Permission to resoure denied.",
80 /* MEMIF_ERR_NO_FILE */
81 "Socket file does not exist",
82 /* MEMIF_ERR_FILE_LIMIT */
83 "System limit on total numer of open files reached.",
84 /* MEMIF_ERR_PROC_FILE_LIMIT */
85 "Per-process limit on total number of open files reached.",
86 /* MEMIF_ERR_ALREADY */
87 "Connection already requested.",
89 "File descriptor refers to file other than socket, or operation would block.",
90 /* MEMIF_ERR_BAD_FD */
91 "Bad file descriptor.",
94 /* MEMIF_ERR_INVAL_ARG */
96 /* MEMIF_ERR_NOCONN */
97 "Memif connection handle does not point to existing conenction",
99 "Memif connection handle points to existing connection",
100 /* MEMIF_ERR_CB_FDUPDATE */
101 "Callback memif_control_fd_update_t returned error",
102 /* MEMIF_ERR_FILE_NOT_SOCK */
103 "File specified by socket filename exists and is not socket.",
104 /* MEMIF_ERR_NO_SHMFD */
105 "Missing shared memory file descriptor. (internal error)",
106 /* MEMIF_ERR_COOKIE */
107 "Invalid cookie on ring. (internal error)",
108 /* MEMIF_ERR_NOBUF_RING */
110 /* MEMIF_ERR_NOBUF */
111 "Not enough memif buffers. There are unreceived data in shared memory.",
112 /* MEMIF_ERR_NOBUF_DET */
113 "Not enough space for memif details in suplied buffer. String data might be malformed.",
114 /* MEMIF_ERR_INT_WRITE */
115 "Send interrupt error.",
116 /* MEMIF_ERR_MFMSG */
117 "Malformed message received on control channel.",
120 /* MEMIF_ERR_PROTO */
121 "Incompatible memory interface protocol version.",
123 "Unmatched interface id.",
124 /* MEMIF_ERR_ACCSLAVE */
125 "Slave cannot accept connection reqest.",
126 /* MEMIF_ERR_ALRCONN */
127 "Interface is already connected.",
130 /* MEMIF_ERR_SECRET */
132 /* MEMIF_ERR_NOSECRET */
134 /* MEMIF_ERR_MAXREG */
135 "Limit on total number of regions reached.",
136 /* MEMIF_ERR_MAXRING */
137 "Limit on total number of ring reached.",
138 /* MEMIF_ERR_NO_INTFD */
139 "Missing interrupt file descriptor. (internal error)",
140 /* MEMIF_ERR_DISCONNECT */
141 "Interface received disconnect request.",
142 /* MEMIF_ERR_DISCONNECTED */
143 "Interface is disconnected.",
144 /* MEMIF_ERR_UNKNOWN_MSG */
145 "Unknown message type received on control channel. (internal error)",
146 /* MEMIF_ERR_POLL_CANCEL */
147 "Memif event polling was canceled.",
148 /* MEMIF_ERR_MAX_RING */
149 "Maximum log2 ring size is 15",
150 /* MEMIF_ERR_PRIVHDR */
151 "Private headers not supported."
154 #define MEMIF_ERR_UNDEFINED "undefined error"
157 memif_strerror (int err_code)
159 if (err_code >= ERRLIST_LEN)
161 strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED));
162 memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0';
166 strncpy (memif_buf, memif_errlist[err_code],
167 strlen (memif_errlist[err_code]));
168 memif_buf[strlen (memif_errlist[err_code])] = '\0';
176 return MEMIF_VERSION;
179 #define DBG_TX_BUF (0)
180 #define DBG_RX_BUF (1)
184 print_bytes (void *data, uint16_t len, uint8_t q)
187 printf ("\nTX:\n\t");
189 printf ("\nRX:\n\t");
191 for (i = 0; i < len; i++)
194 printf ("\n%d:\t", i);
195 printf ("%02X ", ((uint8_t *) (data))[i]);
199 #endif /* MEMIF_DBG_SHM */
202 memif_syscall_error_handler (int err_code)
204 DBG ("%s", strerror (err_code));
207 return MEMIF_ERR_SUCCESS;
208 if (err_code == EACCES)
209 return MEMIF_ERR_ACCES;
210 if (err_code == ENFILE)
211 return MEMIF_ERR_FILE_LIMIT;
212 if (err_code == EMFILE)
213 return MEMIF_ERR_PROC_FILE_LIMIT;
214 if (err_code == ENOMEM)
215 return MEMIF_ERR_NOMEM;
216 /* connection refused if master does not exist
217 this error would spam the user until master was created */
218 if (err_code == ECONNREFUSED)
219 return MEMIF_ERR_SUCCESS;
220 if (err_code == EALREADY)
221 return MEMIF_ERR_ALREADY;
222 if (err_code == EAGAIN)
223 return MEMIF_ERR_AGAIN;
224 if (err_code == EBADF)
225 return MEMIF_ERR_BAD_FD;
226 if (err_code == ENOENT)
227 return MEMIF_ERR_NO_FILE;
229 /* other syscall errors */
230 return MEMIF_ERR_SYSCALL;
234 memif_add_epoll_fd (int fd, uint32_t events)
238 DBG ("invalid fd %d", fd);
241 struct epoll_event evt;
242 memset (&evt, 0, sizeof (evt));
245 if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
247 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
250 DBG ("fd %d added to epoll", fd);
255 memif_mod_epoll_fd (int fd, uint32_t events)
259 DBG ("invalid fd %d", fd);
262 struct epoll_event evt;
263 memset (&evt, 0, sizeof (evt));
266 if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
268 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
271 DBG ("fd %d moddified on epoll", fd);
276 memif_del_epoll_fd (int fd)
280 DBG ("invalid fd %d", fd);
283 struct epoll_event evt;
284 memset (&evt, 0, sizeof (evt));
285 if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
287 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
290 DBG ("fd %d removed from epoll", fd);
295 memif_control_fd_update (int fd, uint8_t events)
297 if (events & MEMIF_FD_EVENT_DEL)
298 return memif_del_epoll_fd (fd);
301 if (events & MEMIF_FD_EVENT_READ)
303 if (events & MEMIF_FD_EVENT_WRITE)
306 if (events & MEMIF_FD_EVENT_MOD)
307 return memif_mod_epoll_fd (fd, evt);
309 return memif_add_epoll_fd (fd, evt);
313 add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
315 libmemif_main_t *lm = &libmemif_main;
318 for (i = 0; i < *len; i++)
320 if ((*list)[i].data_struct == NULL)
322 (*list)[i].key = e->key;
323 (*list)[i].data_struct = e->data_struct;
327 memif_list_elt_t *tmp;
328 tmp = lm->realloc (*list, sizeof (memif_list_elt_t) * *len * 2);
332 for (i = *len; i < *len * 2; i++)
335 tmp[i].data_struct = NULL;
338 tmp[*len].key = e->key;
339 tmp[*len].data_struct = e->data_struct;
348 get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len,
357 for (i = 0; i < len; i++)
359 if (list[i].key == key)
369 /* does not free memory, only marks element as free */
371 free_list_elt (memif_list_elt_t * list, uint16_t len, int key)
374 for (i = 0; i < len; i++)
376 if (list[i].key == key)
379 list[i].data_struct = NULL;
388 free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
389 memif_connection_t * ctx)
392 for (i = 0; i < len; i++)
394 if (list[i].key == -1)
396 if (list[i].data_struct == ctx)
398 list[i].data_struct = NULL;
408 memif_control_fd_update_register (memif_control_fd_update_t * cb)
410 libmemif_main_t *lm = &libmemif_main;
411 lm->control_fd_update = cb;
415 memif_register_external_region (memif_add_external_region_t * ar,
416 memif_get_external_region_addr_t * gr,
417 memif_del_external_region_t * dr,
418 memif_get_external_buffer_offset_t * go)
420 libmemif_main_t *lm = &libmemif_main;
421 lm->add_external_region = ar;
422 lm->get_external_region_addr = gr;
423 lm->del_external_region = dr;
424 lm->get_external_buffer_offset = go;
428 memif_alloc_register (memif_alloc_t * ma)
430 libmemif_main_t *lm = &libmemif_main;
435 memif_realloc_register (memif_realloc_t * mr)
437 libmemif_main_t *lm = &libmemif_main;
442 memif_free_register (memif_free_t * mf)
444 libmemif_main_t *lm = &libmemif_main;
449 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
450 memif_alloc_t * memif_alloc, memif_realloc_t * memif_realloc,
451 memif_free_t * memif_free)
453 int err = MEMIF_ERR_SUCCESS; /* 0 */
454 libmemif_main_t *lm = &libmemif_main;
455 memset (lm, 0, sizeof (libmemif_main_t));
457 if (memif_alloc != NULL)
459 memif_alloc_register (memif_alloc);
462 memif_alloc_register (malloc);
464 if (memif_realloc != NULL)
466 memif_realloc_register (memif_realloc);
469 memif_realloc_register (realloc);
471 if (memif_free != NULL)
472 memif_free_register (memif_free);
474 memif_free_register (free);
476 if (app_name != NULL)
478 uint8_t len = (strlen (app_name) > MEMIF_NAME_LEN)
479 ? strlen (app_name) : MEMIF_NAME_LEN;
480 strncpy ((char *) lm->app_name, app_name, len);
484 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
485 strlen (MEMIF_DEFAULT_APP_NAME));
488 /* register control fd update callback */
489 if (on_control_fd_update != NULL)
490 memif_control_fd_update_register (on_control_fd_update);
493 memif_epfd = epoll_create (1);
494 memif_control_fd_update_register (memif_control_fd_update);
495 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
498 DBG ("eventfd: %s", strerror (err));
499 return memif_syscall_error_handler (err);
501 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ);
502 DBG ("libmemif event polling initialized");
505 lm->control_list_len = 2;
506 lm->interrupt_list_len = 2;
507 lm->listener_list_len = 1;
508 lm->pending_list_len = 1;
511 lm->alloc (sizeof (memif_list_elt_t) * lm->control_list_len);
512 if (lm->control_list == NULL)
514 err = MEMIF_ERR_NOMEM;
518 lm->alloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
519 if (lm->interrupt_list == NULL)
521 err = MEMIF_ERR_NOMEM;
525 lm->alloc (sizeof (memif_list_elt_t) * lm->listener_list_len);
526 if (lm->listener_list == NULL)
528 err = MEMIF_ERR_NOMEM;
532 lm->alloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
533 if (lm->pending_list == NULL)
535 err = MEMIF_ERR_NOMEM;
540 for (i = 0; i < lm->control_list_len; i++)
542 lm->control_list[i].key = -1;
543 lm->control_list[i].data_struct = NULL;
545 for (i = 0; i < lm->interrupt_list_len; i++)
547 lm->interrupt_list[i].key = -1;
548 lm->interrupt_list[i].data_struct = NULL;
550 for (i = 0; i < lm->listener_list_len; i++)
552 lm->listener_list[i].key = -1;
553 lm->listener_list[i].data_struct = NULL;
555 for (i = 0; i < lm->pending_list_len; i++)
557 lm->pending_list[i].key = -1;
558 lm->pending_list[i].data_struct = NULL;
561 lm->disconn_slaves = 0;
563 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
566 err = memif_syscall_error_handler (errno);
570 lm->arm.it_value.tv_sec = 2;
571 lm->arm.it_value.tv_nsec = 0;
572 lm->arm.it_interval.tv_sec = 2;
573 lm->arm.it_interval.tv_nsec = 0;
575 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
577 DBG ("callback type memif_control_fd_update_t error!");
578 err = MEMIF_ERR_CB_FDUPDATE;
589 static inline memif_ring_t *
590 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
593 if (&conn->regions[0] == NULL)
595 void *p = conn->regions[0].addr;
597 sizeof (memif_ring_t) +
598 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
599 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
601 return (memif_ring_t *) p;
605 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
608 memif_connection_t *conn = (memif_connection_t *) c;
610 return MEMIF_ERR_NOCONN;
612 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->run_args.
615 return MEMIF_ERR_QID;
617 conn->rx_queues[qid].ring->flags = rx_mode;
618 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
619 return MEMIF_ERR_SUCCESS;
623 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
624 memif_connection_update_t * on_connect,
625 memif_connection_update_t * on_disconnect,
626 memif_interrupt_t * on_interrupt, void *private_ctx)
628 libmemif_main_t *lm = &libmemif_main;
629 int err, i, index, sockfd = -1;
630 memif_list_elt_t list_elt;
631 memif_connection_t *conn = (memif_connection_t *) * c;
634 DBG ("This handle already points to existing memif.");
635 return MEMIF_ERR_CONN;
637 conn = (memif_connection_t *) lm->alloc (sizeof (memif_connection_t));
640 err = MEMIF_ERR_NOMEM;
643 memset (conn, 0, sizeof (memif_connection_t));
645 conn->args.interface_id = args->interface_id;
647 if (args->log2_ring_size == 0)
648 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
649 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
651 err = MEMIF_ERR_MAX_RING;
654 if (args->buffer_size == 0)
655 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
656 if (args->num_s2m_rings == 0)
657 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
658 if (args->num_m2s_rings == 0)
659 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
661 conn->args.num_s2m_rings = args->num_s2m_rings;
662 conn->args.num_m2s_rings = args->num_m2s_rings;
663 conn->args.buffer_size = args->buffer_size;
664 conn->args.log2_ring_size = args->log2_ring_size;
665 conn->args.is_master = args->is_master;
666 conn->args.mode = args->mode;
667 conn->msg_queue = NULL;
668 conn->regions = NULL;
669 conn->tx_queues = NULL;
670 conn->rx_queues = NULL;
672 conn->on_connect = on_connect;
673 conn->on_disconnect = on_disconnect;
674 conn->on_interrupt = on_interrupt;
675 conn->private_ctx = private_ctx;
676 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
678 uint8_t l = strlen ((char *) args->interface_name);
679 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
682 /* allocate and initialize socket_filename so it can be copyed to sun_path
683 without memory leaks */
684 conn->args.socket_filename = lm->alloc (sizeof (char *) * 108);
685 if (conn->args.socket_filename == NULL)
687 err = MEMIF_ERR_NOMEM;
690 memset (conn->args.socket_filename, 0, 108 * sizeof (char *));
692 if (args->socket_filename)
694 if (conn->args.socket_filename == NULL)
696 err = memif_syscall_error_handler (errno);
699 strncpy ((char *) conn->args.socket_filename,
700 (char *) args->socket_filename,
701 strlen ((char *) args->socket_filename));
705 uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR);
706 uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME);
707 if (conn->args.socket_filename == NULL)
709 err = memif_syscall_error_handler (errno);
712 strncpy ((char *) conn->args.socket_filename,
713 MEMIF_DEFAULT_SOCKET_DIR, sdl);
714 conn->args.socket_filename[sdl] = '/';
715 strncpy ((char *) (conn->args.socket_filename + 1 + sdl),
716 MEMIF_DEFAULT_SOCKET_FILENAME, sfl);
719 if ((l = strlen ((char *) args->secret)) > 0)
721 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
724 if (conn->args.is_master)
726 conn->run_args.buffer_size = conn->args.buffer_size;
728 memif_list_elt_t elt;
729 for (i = 0; i < lm->listener_list_len; i++)
732 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
735 ((char *) ms->filename, (char *) conn->args.socket_filename,
736 strlen ((char *) ms->filename)) == 0)
738 /* add interface to listener socket */
739 elt.key = conn->args.interface_id;
740 *c = elt.data_struct = conn;
741 add_list_elt (&elt, &ms->interface_list,
742 &ms->interface_list_len);
744 conn->listener_fd = ms->fd;
750 struct stat file_stat;
751 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
753 if (S_ISSOCK (file_stat.st_mode))
754 unlink ((char *) conn->args.socket_filename);
756 return memif_syscall_error_handler (errno);
758 DBG ("creating socket file");
759 ms = lm->alloc (sizeof (memif_socket_t));
762 err = MEMIF_ERR_NOMEM;
766 lm->alloc (strlen ((char *) conn->args.socket_filename) +
768 if (ms->filename == NULL)
770 err = MEMIF_ERR_NOMEM;
773 memset (ms->filename, 0,
774 strlen ((char *) conn->args.socket_filename) +
776 strncpy ((char *) ms->filename,
777 (char *) conn->args.socket_filename,
778 strlen ((char *) conn->args.socket_filename));
779 ms->interface_list_len = 1;
781 lm->alloc (sizeof (memif_list_elt_t) *
782 ms->interface_list_len);
783 if (ms->interface_list == NULL)
785 err = MEMIF_ERR_NOMEM;
788 ms->interface_list[0].key = -1;
789 ms->interface_list[0].data_struct = NULL;
790 struct sockaddr_un un = { 0 };
793 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
796 err = memif_syscall_error_handler (errno);
799 DBG ("socket %d created", ms->fd);
800 un.sun_family = AF_UNIX;
801 strncpy ((char *) un.sun_path, (char *) ms->filename,
802 sizeof (un.sun_path) - 1);
805 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
807 err = memif_syscall_error_handler (errno);
811 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
813 err = memif_syscall_error_handler (errno);
817 if (listen (ms->fd, 1) < 0)
819 err = memif_syscall_error_handler (errno);
823 if (stat ((char *) ms->filename, &file_stat) < 0)
825 err = memif_syscall_error_handler (errno);
829 /* add interface to listener socket */
830 elt.key = conn->args.interface_id;
831 *c = elt.data_struct = conn;
832 add_list_elt (&elt, &ms->interface_list,
833 &ms->interface_list_len);
835 conn->listener_fd = ms->fd;
837 /* add listener socket to libmemif main */
839 elt.data_struct = ms;
840 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
841 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
848 if (lm->disconn_slaves == 0)
850 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
852 err = memif_syscall_error_handler (errno);
857 lm->disconn_slaves++;
860 *c = list_elt.data_struct = conn;
862 add_list_elt (&list_elt, &lm->control_list,
863 &lm->control_list_len)) < 0)
865 err = MEMIF_ERR_NOMEM;
878 if (conn->args.socket_filename)
879 lm->free (conn->args.socket_filename);
887 memif_control_fd_handler (int fd, uint8_t events)
889 int i, rv, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */
891 memif_list_elt_t *e = NULL;
892 memif_connection_t *conn;
893 libmemif_main_t *lm = &libmemif_main;
894 if (fd == lm->timerfd)
898 size = read (fd, &b, sizeof (b));
899 for (i = 0; i < lm->control_list_len; i++)
901 if ((lm->control_list[i].key < 0)
902 && (lm->control_list[i].data_struct != NULL))
904 conn = lm->control_list[i].data_struct;
905 if (conn->args.is_master)
908 struct sockaddr_un sun;
909 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
912 err = memif_syscall_error_handler (errno);
916 sun.sun_family = AF_UNIX;
918 strncpy (sun.sun_path, (char *) conn->args.socket_filename,
919 sizeof (sun.sun_path) - 1);
921 if (connect (sockfd, (struct sockaddr *) &sun,
922 sizeof (struct sockaddr_un)) == 0)
925 conn->read_fn = memif_conn_fd_read_ready;
926 conn->write_fn = memif_conn_fd_write_ready;
927 conn->error_fn = memif_conn_fd_error;
929 lm->control_list[conn->index].key = conn->fd;
931 lm->control_fd_update (sockfd,
932 MEMIF_FD_EVENT_READ |
933 MEMIF_FD_EVENT_WRITE);
935 lm->disconn_slaves--;
936 if (lm->disconn_slaves == 0)
938 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL)
941 err = memif_syscall_error_handler (errno);
948 err = memif_syscall_error_handler (errno);
956 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
959 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
962 (((memif_connection_t *) e->data_struct)->args.
963 is_master) ? ((memif_connection_t *) e->data_struct)->
964 run_args.num_s2m_rings : ((memif_connection_t *) e->
965 data_struct)->run_args.
967 for (i = 0; i < num; i++)
969 if (((memif_connection_t *) e->data_struct)->rx_queues[i].
972 ((memif_connection_t *) e->
973 data_struct)->on_interrupt ((void *) e->data_struct,
974 ((memif_connection_t *)
977 return MEMIF_ERR_SUCCESS;
981 return MEMIF_ERR_SUCCESS;
983 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
986 memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
987 return MEMIF_ERR_SUCCESS;
990 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
993 memif_read_ready (fd);
994 return MEMIF_ERR_SUCCESS;
997 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
1000 if (events & MEMIF_FD_EVENT_READ)
1003 ((memif_connection_t *) e->data_struct)->read_fn (e->
1005 if (err != MEMIF_ERR_SUCCESS)
1008 if (events & MEMIF_FD_EVENT_WRITE)
1011 ((memif_connection_t *) e->data_struct)->write_fn (e->
1013 if (err != MEMIF_ERR_SUCCESS)
1016 if (events & MEMIF_FD_EVENT_ERROR)
1019 ((memif_connection_t *) e->data_struct)->error_fn (e->
1021 if (err != MEMIF_ERR_SUCCESS)
1027 return MEMIF_ERR_SUCCESS; /* 0 */
1037 memif_poll_event (int timeout)
1039 libmemif_main_t *lm = &libmemif_main;
1040 memif_list_elt_t *elt;
1041 struct epoll_event evt, *e;
1042 int en = 0, err = MEMIF_ERR_SUCCESS, i = 0; /* 0 */
1044 uint32_t events = 0;
1045 uint64_t counter = 0;
1047 memset (&evt, 0, sizeof (evt));
1048 evt.events = EPOLLIN | EPOLLOUT;
1050 sigemptyset (&sigset);
1051 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
1055 DBG ("epoll_pwait: %s", strerror (err));
1056 return memif_syscall_error_handler (err);
1060 if (evt.data.fd == poll_cancel_fd)
1062 r = read (evt.data.fd, &counter, sizeof (counter));
1063 return MEMIF_ERR_POLL_CANCEL;
1065 if (evt.events & EPOLLIN)
1066 events |= MEMIF_FD_EVENT_READ;
1067 if (evt.events & EPOLLOUT)
1068 events |= MEMIF_FD_EVENT_WRITE;
1069 if (evt.events & EPOLLERR)
1070 events |= MEMIF_FD_EVENT_ERROR;
1071 err = memif_control_fd_handler (evt.data.fd, events);
1078 memif_cancel_poll_event ()
1080 uint64_t counter = 1;
1083 if (poll_cancel_fd == -1)
1085 w = write (poll_cancel_fd, &counter, sizeof (counter));
1086 if (w < sizeof (counter))
1087 return MEMIF_ERR_INT_WRITE;
1093 memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
1097 memif_msg_queue_free (lm, &(*e)->next);
1103 /* send disconnect msg and close interface */
1105 memif_disconnect_internal (memif_connection_t * c)
1109 DBG ("no connection");
1110 return MEMIF_ERR_NOCONN;
1113 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1115 libmemif_main_t *lm = &libmemif_main;
1116 memif_list_elt_t *e;
1118 c->on_disconnect ((void *) c, c->private_ctx);
1122 memif_msg_send_disconnect (c->fd, (uint8_t *) "interface deleted", 0);
1123 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1126 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1129 if (c->args.is_master)
1130 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1131 e->key = c->fd = -1;
1134 if (c->tx_queues != NULL)
1137 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1139 for (i = 0; i < num; i++)
1141 mq = &c->tx_queues[i];
1146 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1151 lm->free (c->tx_queues);
1152 c->tx_queues = NULL;
1155 if (c->rx_queues != NULL)
1158 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1160 for (i = 0; i < num; i++)
1162 mq = &c->rx_queues[i];
1167 if (c->on_interrupt != NULL)
1168 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1171 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1176 lm->free (c->rx_queues);
1177 c->rx_queues = NULL;
1180 for (i = 0; i < c->regions_num; i++)
1182 if (c->regions[i].is_external != 0)
1184 lm->del_external_region (c->regions[i].addr,
1185 c->regions[i].region_size,
1186 c->regions[i].fd, c->private_ctx);
1190 if (munmap (c->regions[i].addr, c->regions[i].region_size) < 0)
1191 return memif_syscall_error_handler (errno);
1192 if (c->regions[i].fd > 0)
1193 close (c->regions[i].fd);
1194 c->regions[i].fd = -1;
1197 lm->free (c->regions);
1201 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1203 memif_msg_queue_free (lm, &c->msg_queue);
1205 if (!(c->args.is_master))
1207 if (lm->disconn_slaves == 0)
1209 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1211 err = memif_syscall_error_handler (errno);
1212 DBG ("timerfd_settime: arm");
1215 lm->disconn_slaves++;
1222 memif_delete (memif_conn_handle_t * conn)
1224 memif_connection_t *c = (memif_connection_t *) * conn;
1227 DBG ("no connection");
1228 return MEMIF_ERR_NOCONN;
1230 libmemif_main_t *lm = &libmemif_main;
1231 memif_list_elt_t *e = NULL;
1232 memif_socket_t *ms = NULL;
1234 int err = MEMIF_ERR_SUCCESS;
1238 DBG ("DISCONNECTING");
1239 err = memif_disconnect_internal (c);
1240 if (err == MEMIF_ERR_NOCONN)
1244 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1246 if (c->args.is_master)
1248 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1252 ms = (memif_socket_t *) e->data_struct;
1254 free_list_elt (ms->interface_list, ms->interface_list_len,
1255 c->args.interface_id);
1256 if (ms->use_count <= 0)
1258 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1259 free_list_elt (lm->listener_list, lm->listener_list_len,
1261 close (c->listener_fd);
1262 c->listener_fd = ms->fd = -1;
1263 lm->free (ms->interface_list);
1264 ms->interface_list = NULL;
1265 lm->free (ms->filename);
1266 ms->filename = NULL;
1274 lm->disconn_slaves--;
1275 if (lm->disconn_slaves <= 0)
1277 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1279 err = memif_syscall_error_handler (errno);
1280 DBG ("timerfd_settime: disarm");
1285 if (c->args.socket_filename)
1286 lm->free (c->args.socket_filename);
1287 c->args.socket_filename = NULL;
1297 memif_connect1 (memif_connection_t * c)
1299 libmemif_main_t *lm = &libmemif_main;
1305 for (i = 0; i < c->regions_num; i++)
1307 mr = &c->regions[i];
1312 if (mr->is_external)
1314 if (lm->get_external_region_addr == NULL)
1315 return 99; /* FIXME: propper error report */
1317 lm->get_external_region_addr (mr->region_size, mr->fd,
1323 return MEMIF_ERR_NO_SHMFD;
1326 mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1327 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1329 return memif_syscall_error_handler (errno);
1336 for (i = 0; i < c->rx_queues_num; i++)
1338 mq = &c->rx_queues[i];
1341 mq->ring = c->regions[mq->region].addr + mq->offset;
1342 if (mq->ring->cookie != MEMIF_COOKIE)
1344 DBG ("wrong cookie on rx ring %u", i);
1345 return MEMIF_ERR_COOKIE;
1347 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1352 for (i = 0; i < c->tx_queues_num; i++)
1354 mq = &c->tx_queues[i];
1357 mq->ring = c->regions[mq->region].addr + mq->offset;
1358 if (mq->ring->cookie != MEMIF_COOKIE)
1360 DBG ("wrong cookie on tx ring %u", i);
1361 return MEMIF_ERR_COOKIE;
1363 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1368 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1374 memif_add_region (libmemif_main_t * lm, memif_connection_t * conn,
1375 uint8_t has_buffers)
1380 lm->realloc (conn->regions,
1381 sizeof (memif_region_t) * ++conn->regions_num);
1383 return MEMIF_ERR_NOMEM;
1386 r = &conn->regions[conn->regions_num - 1];
1387 memset (r, 0, sizeof (memif_region_t));
1389 if (has_buffers != 0)
1391 r->buffer_offset = 0;
1396 (conn->run_args.num_s2m_rings +
1397 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1398 sizeof (memif_desc_t) *
1399 (1 << conn->run_args.
1403 r->region_size = (has_buffers == 0) ? r->buffer_offset : r->buffer_offset +
1404 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1405 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1407 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1408 return memif_syscall_error_handler (errno);
1410 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1411 return memif_syscall_error_handler (errno);
1413 if ((ftruncate (r->fd, r->region_size)) == -1)
1414 return memif_syscall_error_handler (errno);
1416 if ((r->addr = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1417 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1418 return memif_syscall_error_handler (errno);
1420 return MEMIF_ERR_SUCCESS;
1424 memif_init_queues (libmemif_main_t * lm, memif_connection_t * conn)
1429 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1431 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1432 DBG ("RING: %p I: %d", ring, i);
1433 ring->head = ring->tail = 0;
1434 ring->cookie = MEMIF_COOKIE;
1436 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1438 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1439 ring->desc[j].region = 1;
1440 ring->desc[j].offset =
1441 conn->regions[1].buffer_offset +
1442 (uint32_t) (slot * conn->run_args.buffer_size);
1443 ring->desc[j].length = conn->run_args.buffer_size;
1446 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1448 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1449 DBG ("RING: %p I: %d", ring, i);
1450 ring->head = ring->tail = 0;
1451 ring->cookie = MEMIF_COOKIE;
1453 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1455 uint16_t slot = (i + conn->run_args.num_s2m_rings) *
1456 (1 << conn->run_args.log2_ring_size) + j;
1457 ring->desc[j].region = 1;
1458 ring->desc[j].offset =
1459 conn->regions[1].buffer_offset +
1460 (uint32_t) (slot * conn->run_args.buffer_size);
1461 ring->desc[j].length = conn->run_args.buffer_size;
1465 DBG ("alloc: %p", lm->alloc);
1466 DBG ("size: %lu", sizeof (memif_queue_t) * conn->run_args.num_s2m_rings);
1468 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1469 conn->run_args.num_s2m_rings);
1471 return MEMIF_ERR_NOMEM;
1475 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1477 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1478 return memif_syscall_error_handler (errno);
1479 e.key = mq[x].int_fd;
1480 e.data_struct = conn;
1481 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1483 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1484 DBG ("RING: %p I: %d", mq[x].ring, x);
1485 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1488 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1489 mq[x].last_head = mq[x].last_tail = 0;
1490 mq[x].alloc_bufs = 0;
1492 conn->tx_queues = mq;
1495 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1496 conn->run_args.num_m2s_rings);
1498 return MEMIF_ERR_NOMEM;
1500 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1502 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1503 return memif_syscall_error_handler (errno);
1504 e.key = mq[x].int_fd;
1505 e.data_struct = conn;
1506 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1508 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1509 DBG ("RING: %p I: %d", mq[x].ring, x);
1510 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1513 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1514 mq[x].last_head = mq[x].last_tail = 0;
1515 mq[x].alloc_bufs = 0;
1517 conn->rx_queues = mq;
1519 return MEMIF_ERR_SUCCESS;
1523 memif_init_regions_and_queues (memif_connection_t * conn)
1525 memif_ring_t *ring = NULL;
1528 libmemif_main_t *lm = &libmemif_main;
1531 /* region 0. rings */
1532 memif_add_region (lm, conn, /* has_buffers */ 0);
1534 /* region 1. buffers */
1535 if (lm->add_external_region)
1538 (memif_region_t *) lm->realloc (conn->regions,
1539 sizeof (memif_region_t) *
1540 ++conn->regions_num);
1542 return MEMIF_ERR_NOMEM;
1545 conn->regions[1].region_size =
1546 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1547 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1548 conn->regions[1].buffer_offset = 0;
1549 lm->add_external_region (&conn->regions[1].addr,
1550 conn->regions[1].region_size,
1551 &conn->regions[1].fd, conn->private_ctx);
1552 conn->regions[1].is_external = 1;
1556 memif_add_region (lm, conn, 1);
1559 memif_init_queues (lm, conn);
1565 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1566 memif_buffer_t * bufs, uint16_t count,
1567 uint16_t * count_out)
1569 memif_connection_t *c = (memif_connection_t *) conn;
1570 if (EXPECT_FALSE (c == NULL))
1571 return MEMIF_ERR_NOCONN;
1572 if (EXPECT_FALSE (c->fd < 0))
1573 return MEMIF_ERR_DISCONNECTED;
1575 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1577 if (EXPECT_FALSE (qid >= num))
1578 return MEMIF_ERR_QID;
1579 if (EXPECT_FALSE (!count_out))
1580 return MEMIF_ERR_INVAL_ARG;
1581 if (EXPECT_FALSE (c->args.is_master))
1582 return MEMIF_ERR_INVAL_ARG;
1584 memif_queue_t *mq = &c->tx_queues[qid];
1585 memif_ring_t *ring = mq->ring;
1587 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1590 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1593 ring_size = (1 << mq->log2_ring_size);
1594 slot = (c->args.is_master) ? ring->tail : ring->head;
1595 slot += mq->alloc_bufs;
1597 /* can only be called by slave */
1598 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1604 if (EXPECT_FALSE ((b0->flags & MEMIF_BUFFER_FLAG_RX) == 0))
1606 /* not a valid buffer */
1610 b0->flags &= ~MEMIF_BUFFER_FLAG_RX;
1612 ((memif_ring_t *) b0->ring)->desc[b0->desc_index & mask].offset = ring->desc[slot & mask].offset; /* put free buffer on rx ring */
1614 ring->desc[slot & mask].offset =
1615 (uint32_t) (b0->data -
1616 c->regions[ring->desc[slot & mask].region].addr);
1617 ring->desc[slot & mask].flags |=
1618 (b0->flags & MEMIF_BUFFER_FLAG_NEXT) ? MEMIF_DESC_FLAG_NEXT : 0;
1620 b0->desc_index = slot;
1631 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1636 DBG ("ring buffer full! qid: %u", qid);
1637 err = MEMIF_ERR_NOBUF_RING;
1645 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1646 memif_buffer_t * bufs, uint16_t count,
1647 uint16_t * count_out, uint16_t size)
1649 memif_connection_t *c = (memif_connection_t *) conn;
1650 if (EXPECT_FALSE (c == NULL))
1651 return MEMIF_ERR_NOCONN;
1652 if (EXPECT_FALSE (c->fd < 0))
1653 return MEMIF_ERR_DISCONNECTED;
1655 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1657 if (EXPECT_FALSE (qid >= num))
1658 return MEMIF_ERR_QID;
1659 if (EXPECT_FALSE (!count_out))
1660 return MEMIF_ERR_INVAL_ARG;
1662 libmemif_main_t *lm = &libmemif_main;
1663 memif_queue_t *mq = &c->tx_queues[qid];
1664 memif_ring_t *ring = mq->ring;
1665 memif_buffer_t *b0, *b1;
1666 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1667 uint32_t offset_mask = c->run_args.buffer_size - 1;
1670 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
1671 uint16_t dst_left, src_left;
1672 uint16_t saved_count;
1673 memif_buffer_t *saved_b;
1676 ring_size = (1 << mq->log2_ring_size);
1677 slot = (c->args.is_master) ? ring->tail : ring->head;
1678 slot += mq->alloc_bufs;
1680 if (c->args.is_master)
1681 ns = ring->head - (ring->tail + mq->alloc_bufs);
1683 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1687 b0 = (bufs + *count_out);
1690 saved_count = count;
1692 b0->desc_index = slot;
1693 ring->desc[slot & mask].flags = 0;
1695 /* slave can produce buffer with original length */
1696 dst_left = (c->args.is_master) ? ring->desc[slot & mask].length :
1697 c->run_args.buffer_size;
1702 if (EXPECT_FALSE (dst_left == 0))
1711 ring->desc[b0->desc_index & mask].flags |=
1712 MEMIF_DESC_FLAG_NEXT;
1713 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1715 b0 = (bufs + *count_out);
1716 b0->desc_index = slot;
1718 (c->args.is_master) ? ring->desc[slot & mask].length : c->
1719 run_args.buffer_size;
1720 ring->desc[slot & mask].flags = 0;
1724 /* rollback allocated chain buffers */
1725 memset (saved_b, 0, sizeof (memif_buffer_t)
1726 * (saved_count - count + 1));
1727 *count_out -= saved_count - count;
1728 mq->alloc_bufs = saved_count - count;
1732 b0->len = memif_min (dst_left, src_left);
1734 /* slave resets buffer offset */
1735 if (c->args.is_master == 0)
1737 memif_desc_t *d = &ring->desc[slot & mask];
1738 if (lm->get_external_buffer_offset)
1739 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1741 d->offset = d->offset - (d->offset & offset_mask);
1743 b0->data = memif_get_buffer (c, ring, slot & mask);
1745 src_left -= b0->len;
1746 dst_left -= b0->len;
1758 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1763 DBG ("ring buffer full! qid: %u", qid);
1764 err = MEMIF_ERR_NOBUF_RING;
1772 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1775 memif_connection_t *c = (memif_connection_t *) conn;
1776 if (EXPECT_FALSE (c == NULL))
1777 return MEMIF_ERR_NOCONN;
1778 if (EXPECT_FALSE (c->fd < 0))
1779 return MEMIF_ERR_DISCONNECTED;
1781 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1783 if (EXPECT_FALSE (qid >= num))
1784 return MEMIF_ERR_QID;
1785 libmemif_main_t *lm = &libmemif_main;
1786 memif_queue_t *mq = &c->rx_queues[qid];
1787 memif_ring_t *ring = mq->ring;
1788 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1789 uint32_t offset_mask = c->run_args.buffer_size - 1;
1792 if (c->args.is_master)
1794 MEMIF_MEMORY_BARRIER ();
1796 (ring->tail + count <=
1797 mq->last_head) ? ring->tail + count : mq->last_head;
1798 return MEMIF_ERR_SUCCESS;
1801 uint16_t head = ring->head;
1802 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1803 head += (count < ns) ? count : ns;
1809 d = &ring->desc[slot & mask];
1811 d->length = c->run_args.buffer_size - headroom;
1812 if (lm->get_external_buffer_offset)
1813 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1815 d->offset = d->offset - (d->offset & offset_mask) + headroom;
1819 MEMIF_MEMORY_BARRIER ();
1822 return MEMIF_ERR_SUCCESS; /* 0 */
1826 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1827 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1829 memif_connection_t *c = (memif_connection_t *) conn;
1830 if (EXPECT_FALSE (c == NULL))
1831 return MEMIF_ERR_NOCONN;
1832 if (EXPECT_FALSE (c->fd < 0))
1833 return MEMIF_ERR_DISCONNECTED;
1835 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
1837 if (EXPECT_FALSE (qid >= num))
1838 return MEMIF_ERR_QID;
1839 if (EXPECT_FALSE (!tx))
1840 return MEMIF_ERR_INVAL_ARG;
1842 memif_queue_t *mq = &c->tx_queues[qid];
1843 memif_ring_t *ring = mq->ring;
1844 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1848 if (count > mq->alloc_bufs)
1849 count = mq->alloc_bufs;
1851 if (EXPECT_FALSE (count == 0))
1852 return MEMIF_ERR_SUCCESS;
1857 ring->desc[b0->desc_index & mask].length = b0->len;
1859 #ifdef MEMIF_DBG_SHM
1860 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1861 printf ("data: %p\n",
1862 memif_get_buffer (c, ring, b0->desc_index & mask));
1863 printf ("index: %u\n", b0->desc_index);
1864 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1865 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1866 #endif /* MEMIF_DBG_SHM */
1873 MEMIF_MEMORY_BARRIER ();
1874 if (c->args.is_master)
1875 ring->tail = b0->desc_index + 1;
1877 ring->head = b0->desc_index + 1;
1879 mq->alloc_bufs -= *tx;
1881 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1884 int r = write (mq->int_fd, &a, sizeof (a));
1886 return MEMIF_ERR_INT_WRITE;
1889 return MEMIF_ERR_SUCCESS; /* 0 */
1893 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1894 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1896 memif_connection_t *c = (memif_connection_t *) conn;
1897 if (EXPECT_FALSE (c == NULL))
1898 return MEMIF_ERR_NOCONN;
1899 if (EXPECT_FALSE (c->fd < 0))
1900 return MEMIF_ERR_DISCONNECTED;
1902 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
1904 if (EXPECT_FALSE (qid >= num))
1905 return MEMIF_ERR_QID;
1906 if (EXPECT_FALSE (!rx))
1907 return MEMIF_ERR_INVAL_ARG;
1909 memif_queue_t *mq = &c->rx_queues[qid];
1910 memif_ring_t *ring = mq->ring;
1911 uint16_t cur_slot, last_slot;
1913 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1914 memif_buffer_t *b0, *b1;
1918 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1919 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1920 return memif_syscall_error_handler (errno);
1922 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1923 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1924 if (cur_slot == last_slot)
1925 return MEMIF_ERR_SUCCESS;
1927 ns = last_slot - cur_slot;
1933 b0->desc_index = cur_slot;
1934 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1935 b0->len = ring->desc[cur_slot & mask].length;
1936 /* slave resets buffer length */
1937 if (c->args.is_master == 0)
1939 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1942 b0->flags = MEMIF_BUFFER_FLAG_RX;
1943 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1945 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1946 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1948 /* b0->offset = ring->desc[cur_slot & mask].offset;*/
1950 #ifdef MEMIF_DBG_SHM
1951 printf ("data: %p\n", b0->data);
1952 printf ("index: %u\n", b0->desc_index);
1953 printf ("ring: %p\n", b0->ring);
1954 print_bytes (b0->data, b0->len, DBG_RX_BUF);
1955 #endif /* MEMIF_DBG_SHM */
1963 if (c->args.is_master)
1964 mq->last_head = cur_slot;
1966 mq->last_tail = cur_slot;
1970 DBG ("not enough buffers!");
1971 return MEMIF_ERR_NOBUF;
1974 return MEMIF_ERR_SUCCESS; /* 0 */
1978 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
1979 char *buf, ssize_t buflen)
1981 libmemif_main_t *lm = &libmemif_main;
1982 memif_connection_t *c = (memif_connection_t *) conn;
1984 return MEMIF_ERR_NOCONN;
1986 int err = MEMIF_ERR_SUCCESS, i;
1987 ssize_t l0, l1, total_l;
1990 l1 = strlen ((char *) c->args.interface_name);
1991 if (l0 + l1 < buflen)
1994 (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
1998 err = MEMIF_ERR_NOBUF_DET;
2000 l1 = strlen ((char *) lm->app_name);
2001 if (l0 + l1 < buflen)
2003 md->inst_name = (uint8_t *) strcpy (buf + l0, (char *) lm->app_name);
2007 err = MEMIF_ERR_NOBUF_DET;
2009 l1 = strlen ((char *) c->remote_if_name);
2010 if (l0 + l1 < buflen)
2012 md->remote_if_name =
2013 (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
2017 err = MEMIF_ERR_NOBUF_DET;
2019 l1 = strlen ((char *) c->remote_name);
2020 if (l0 + l1 < buflen)
2022 md->remote_inst_name =
2023 (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
2027 err = MEMIF_ERR_NOBUF_DET;
2029 md->id = c->args.interface_id;
2031 if (strlen ((char *) c->args.secret) > 0)
2033 l1 = strlen ((char *) c->args.secret);
2034 if (l0 + l1 < buflen)
2036 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
2040 err = MEMIF_ERR_NOBUF_DET;
2043 md->role = (c->args.is_master) ? 0 : 1;
2044 md->mode = c->args.mode;
2046 l1 = strlen ((char *) c->args.socket_filename);
2047 if (l0 + l1 < buflen)
2049 md->socket_filename =
2050 (uint8_t *) strcpy (buf + l0, (char *) c->args.socket_filename);
2054 err = MEMIF_ERR_NOBUF_DET;
2056 md->regions_num = c->regions_num;
2057 l1 = sizeof (memif_region_details_t) * md->regions_num;
2058 if (l0 + l1 <= buflen)
2060 md->regions = (memif_region_details_t *) buf + l0;
2064 err = MEMIF_ERR_NOBUF_DET;
2066 for (i = 0; i < md->regions_num; i++)
2068 md->regions[i].index = i;
2069 md->regions[i].addr = c->regions[i].addr;
2070 md->regions[i].size = c->regions[i].region_size;
2071 md->regions[i].fd = c->regions[i].fd;
2072 md->regions[i].is_external = c->regions[i].is_external;
2076 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
2079 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
2080 if (l0 + l1 <= buflen)
2082 md->rx_queues = (memif_queue_details_t *) buf + l0;
2086 err = MEMIF_ERR_NOBUF_DET;
2088 for (i = 0; i < md->rx_queues_num; i++)
2090 md->rx_queues[i].region = c->rx_queues[i].region;
2091 md->rx_queues[i].qid = i;
2092 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2093 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2094 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2095 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2096 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2100 (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args.
2103 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2104 if (l0 + l1 <= buflen)
2106 md->tx_queues = (memif_queue_details_t *) buf + l0;
2110 err = MEMIF_ERR_NOBUF_DET;
2112 for (i = 0; i < md->tx_queues_num; i++)
2114 md->tx_queues[i].region = c->tx_queues[i].region;
2115 md->tx_queues[i].qid = i;
2116 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2117 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2118 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2119 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2120 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2123 md->link_up_down = (c->fd > 0) ? 1 : 0;
2129 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2131 memif_connection_t *c = (memif_connection_t *) conn;
2134 return MEMIF_ERR_NOCONN;
2136 return MEMIF_ERR_DISCONNECTED;
2138 (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args.
2141 return MEMIF_ERR_QID;
2143 *efd = c->rx_queues[qid].int_fd;
2145 return MEMIF_ERR_SUCCESS;
2151 libmemif_main_t *lm = &libmemif_main;
2152 if (lm->control_list)
2153 lm->free (lm->control_list);
2154 lm->control_list = NULL;
2155 if (lm->interrupt_list)
2156 lm->free (lm->interrupt_list);
2157 lm->interrupt_list = NULL;
2158 if (lm->listener_list)
2159 lm->free (lm->listener_list);
2160 lm->listener_list = NULL;
2161 if (lm->pending_list)
2162 lm->free (lm->pending_list);
2163 lm->pending_list = NULL;
2164 if (poll_cancel_fd != -1)
2165 close (poll_cancel_fd);
2167 return MEMIF_ERR_SUCCESS; /* 0 */