diff options
Diffstat (limited to 'extras/libmemif/src/main.c')
| -rw-r--r-- | extras/libmemif/src/main.c | 1810 |
1 files changed, 1810 insertions, 0 deletions
diff --git a/extras/libmemif/src/main.c b/extras/libmemif/src/main.c new file mode 100644 index 00000000000..d1b59eea8fe --- /dev/null +++ b/extras/libmemif/src/main.c @@ -0,0 +1,1810 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2017 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *------------------------------------------------------------------ + */ + +#include <stdint.h> +#include <net/if.h> +#include <sys/types.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/uio.h> +#include <sys/mman.h> +#include <sys/prctl.h> +#include <inttypes.h> +#include <string.h> +#include <stdio.h> +#include <netdb.h> +#include <linux/ip.h> +#include <linux/icmp.h> +#include <arpa/inet.h> +#include <stdlib.h> +#include <netinet/if_ether.h> +#include <net/if_arp.h> +#include <asm/byteorder.h> +#include <byteswap.h> +#include <string.h> +#include <errno.h> +#include <sys/stat.h> +#include <sys/eventfd.h> +#include <sys/timerfd.h> +#include <sys/epoll.h> +#include <signal.h> + +/* memif protocol msg, ring and descriptor definitions */ +#include <memif.h> +/* memif api */ +#include <libmemif.h> +/* socket messaging functions */ +#include <socket.h> +/* private structs and functions */ +#include <memif_private.h> + +#define ERRLIST_LEN 36 +#define MAX_ERRBUF_LEN 256 + +#if __x86_x64__ +#define MEMIF_MEMORY_BARRIER() __builtin_ia32_sfence () +#else +#define MEMIF_MEORY_BARRIER() __sync_synchronize () +#endif /* __x86_x64__ */ + +libmemif_main_t libmemif_main; +int memif_epfd; + +static char memif_buf[MAX_ERRBUF_LEN]; + +const char *memif_errlist[ERRLIST_LEN] = { /* MEMIF_ERR_SUCCESS */ + "Success.", + /* MEMIF_ERR_SYSCALL */ + "Unspecified syscall error (build with -DMEMIF_DBG or make debug).", + /* MEMIF_ERR_ACCES */ + "Permission to resoure denied.", + /* MEMIF_ERR_NO_FILE */ + "Socket file does not exist", + /* MEMIF_ERR_FILE_LIMIT */ + "System limit on total numer of open files reached.", + /* MEMIF_ERR_PROC_FILE_LIMIT */ + "Per-process limit on total number of open files reached.", + /* MEMIF_ERR_ALREADY */ + "Connection already requested.", + /* MEMIF_ERR_AGAIN */ + "File descriptor refers to file other than socket, or operation would block.", + /* MEMIF_ERR_BAD_FD */ + "Bad file descriptor.", + /* MEMIF_ERR_NOMEM */ + "Out of memory.", + /* MEMIF_ERR_INVAL_ARG */ + "Invalid argument.", + /* MEMIF_ERR_NOCONN */ + "Memif connection handle does not point to existing conenction", + /* MEMIF_ERR_CONN */ + "Memif connection handle points to existing connection", + /* MEMIF_ERR_CB_FDUPDATE */ + "Callback memif_control_fd_update_t returned error", + /* MEMIF_ERR_FILE_NOT_SOCK */ + "File specified by socket filename exists and is not socket.", + /* MEMIF_ERR_NO_SHMFD */ + "Missing shared memory file descriptor. (internal error)", + /* MEMIF_ERR_COOKIE */ + "Invalid cookie on ring. (internal error)", + /* MEMIF_ERR_NOBUF_RING */ + "Ring buffer full.", + /* MEMIF_ERR_NOBUF */ + "Not enough memif buffers. There are unreceived data in shared memory.", + /* MEMIF_ERR_NOBUF_DET */ + "Not enough space for memif details in suplied buffer. String data might be malformed.", + /* MEMIF_ERR_INT_WRITE */ + "Send interrupt error.", + /* MEMIF_ERR_MFMSG */ + "Malformed message received on control channel.", + /* MEMIF_ERR_QID */ + "Invalid queue id", + /* MEMIF_ERR_PROTO */ + "Incompatible memory interface protocol version.", + /* MEMIF_ERR_ID */ + "Unmatched interface id.", + /* MEMIF_ERR_ACCSLAVE */ + "Slave cannot accept connection reqest.", + /* MEMIF_ERR_ALRCONN */ + "Interface is already connected.", + /* MEMIF_ERR_MODE */ + "Mode mismatch.", + /* MEMIF_ERR_SECRET */ + "Secret mismatch.", + /* MEMIF_ERR_NOSECRET */ + "Secret required.", + /* MEMIF_ERR_MAXREG */ + "Limit on total number of regions reached.", + /* MEMIF_ERR_MAXRING */ + "Limit on total number of ring reached.", + /* MEMIF_ERR_NO_INTFD */ + "Missing interrupt file descriptor. (internal error)", + /* MEMIF_ERR_DISCONNECT */ + "Interface received disconnect request.", + /* MEMIF_ERR_DISCONNECTED */ + "Interface is disconnected.", + /* MEMIF_ERR_UNKNOWN_MSG */ + "Unknown message type received on control channel. (internal error)" +}; + +#define MEMIF_ERR_UNDEFINED "undefined error" + +char * +memif_strerror (int err_code) +{ + if (err_code >= ERRLIST_LEN) + { + strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED)); + memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0'; + } + else + { + strncpy (memif_buf, memif_errlist[err_code], + strlen (memif_errlist[err_code])); + memif_buf[strlen (memif_errlist[err_code])] = '\0'; + } + return memif_buf; +} + +#define DBG_TX_BUF (0) +#define DBG_RX_BUF (1) + +#ifdef MEMIF_DBG_SHM +static void +print_bytes (void *data, uint16_t len, uint8_t q) +{ + if (q == DBG_TX_BUF) + printf ("\nTX:\n\t"); + else + printf ("\nRX:\n\t"); + int i; + for (i = 0; i < len; i++) + { + if (i % 8 == 0) + printf ("\n%d:\t", i); + printf ("%02X ", ((uint8_t *) (data))[i]); + } + printf ("\n\n"); +} +#endif /* MEMIF_DBG */ + +int +memif_syscall_error_handler (int err_code) +{ + DBG_UNIX ("%s", strerror (err_code)); + + if (err_code == 0) + return MEMIF_ERR_SUCCESS; + if (err_code == EACCES) + return MEMIF_ERR_ACCES; + if (err_code == ENFILE) + return MEMIF_ERR_FILE_LIMIT; + if (err_code == EMFILE) + return MEMIF_ERR_PROC_FILE_LIMIT; + if (err_code == ENOMEM) + return MEMIF_ERR_NOMEM; +/* connection refused if master dows not exist + this error would spam the user until master was created */ + if (err_code == ECONNREFUSED) + return MEMIF_ERR_SUCCESS; + if (err_code == EALREADY) + return MEMIF_ERR_ALREADY; + if (err_code == EAGAIN) + return MEMIF_ERR_AGAIN; + if (err_code == EBADF) + return MEMIF_ERR_BAD_FD; + if (err_code == ENOENT) + return MEMIF_ERR_NO_FILE; + + /* other syscall errors */ + return MEMIF_ERR_SYSCALL; +} + +static int +memif_add_epoll_fd (int fd, uint32_t events) +{ + if (fd < 0) + { + DBG ("invalid fd %d", fd); + return -1; + } + struct epoll_event evt; + memset (&evt, 0, sizeof (evt)); + evt.events = events; + evt.data.fd = fd; + if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0) + { + DBG ("epoll_ctl: %s fd %d", strerror (errno), fd); + return -1; + } + DBG ("fd %d added to epoll", fd); + return 0; +} + +static int +memif_mod_epoll_fd (int fd, uint32_t events) +{ + if (fd < 0) + { + DBG ("invalid fd %d", fd); + return -1; + } + struct epoll_event evt; + memset (&evt, 0, sizeof (evt)); + evt.events = events; + evt.data.fd = fd; + if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0) + { + DBG ("epoll_ctl: %s fd %d", strerror (errno), fd); + return -1; + } + DBG ("fd %d moddified on epoll", fd); + return 0; +} + +static int +memif_del_epoll_fd (int fd) +{ + if (fd < 0) + { + DBG ("invalid fd %d", fd); + return -1; + } + struct epoll_event evt; + memset (&evt, 0, sizeof (evt)); + if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0) + { + DBG ("epoll_ctl: %s fd %d", strerror (errno), fd); + return -1; + } + DBG ("fd %d removed from epoll", fd); + return 0; +} + +int +memif_control_fd_update (int fd, uint8_t events) +{ + if (events & MEMIF_FD_EVENT_DEL) + return memif_del_epoll_fd (fd); + + uint32_t evt = 0; + if (events & MEMIF_FD_EVENT_READ) + evt |= EPOLLIN; + if (events & MEMIF_FD_EVENT_WRITE) + evt |= EPOLLOUT; + + if (events & MEMIF_FD_EVENT_MOD) + return memif_mod_epoll_fd (fd, evt); + + return memif_add_epoll_fd (fd, evt); +} + +int +add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len) +{ + libmemif_main_t *lm = &libmemif_main; + + int i; + for (i = 0; i < *len; i++) + { + if ((*list)[i].data_struct == NULL) + { + (*list)[i].key = e->key; + (*list)[i].data_struct = e->data_struct; + return i; + } + } + memif_list_elt_t *tmp; + tmp = realloc (*list, sizeof (memif_list_elt_t) * *len * 2); + if (tmp == NULL) + return -1; + + for (i = *len; i < *len * 2; i++) + { + tmp[i].key = -1; + tmp[i].data_struct = NULL; + } + + tmp[*len].key = e->key; + tmp[*len].data_struct = e->data_struct; + i = *len; + *len = *len * 2; + *list = tmp; + + return i; +} + +int +get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len, + int key) +{ + if (key == -1) + { + *e = NULL; + return -1; + } + int i; + for (i = 0; i < len; i++) + { + if (list[i].key == key) + { + *e = &list[i]; + return 0; + } + } + *e = NULL; + return -1; +} + +/* does not free memory, only marks element as free */ +int +free_list_elt (memif_list_elt_t * list, uint16_t len, int key) +{ + int i; + for (i = 0; i < len; i++) + { + if (list[i].key == key) + { + list[i].key = -1; + list[i].data_struct = NULL; + return 0; + } + } + + return -1; +} + +int +free_list_elt_ctx (memif_list_elt_t * list, uint16_t len, + memif_connection_t * ctx) +{ + int i; + for (i = 0; i < len; i++) + { + if (list[i].key == -1) + { + if (list[i].data_struct == ctx) + { + list[i].data_struct = NULL; + return 0; + } + } + } + + return -1; +} + +static void +memif_control_fd_update_register (memif_control_fd_update_t * cb) +{ + libmemif_main_t *lm = &libmemif_main; + lm->control_fd_update = cb; +} + +int +memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name) +{ + int err = MEMIF_ERR_SUCCESS; /* 0 */ + libmemif_main_t *lm = &libmemif_main; + + if (app_name) + { + lm->app_name = malloc (strlen (app_name) + sizeof (char)); + memset (lm->app_name, 0, strlen (app_name) + sizeof (char)); + strncpy ((char *) lm->app_name, app_name, strlen (app_name)); + } + else + { + lm->app_name = malloc (strlen (MEMIF_DEFAULT_APP_NAME) + sizeof (char)); + memset (lm->app_name, 0, strlen (app_name) + sizeof (char)); + strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME, + strlen (MEMIF_DEFAULT_APP_NAME)); + } + + /* register control fd update callback */ + if (on_control_fd_update != NULL) + memif_control_fd_update_register (on_control_fd_update); + else + { + memif_epfd = epoll_create (1); + memif_control_fd_update_register (memif_control_fd_update); + DBG ("libmemif event polling initialized"); + } + + memset (&lm->ms, 0, sizeof (memif_socket_t)); + + lm->control_list_len = 2; + lm->interrupt_list_len = 2; + lm->listener_list_len = 1; + lm->pending_list_len = 1; + + lm->control_list = + malloc (sizeof (memif_list_elt_t) * lm->control_list_len); + lm->interrupt_list = + malloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len); + lm->listener_list = + malloc (sizeof (memif_list_elt_t) * lm->listener_list_len); + lm->pending_list = + malloc (sizeof (memif_list_elt_t) * lm->pending_list_len); + + int i; + for (i = 0; i < lm->control_list_len; i++) + { + lm->control_list[i].key = -1; + lm->control_list[i].data_struct = NULL; + } + for (i = 0; i < lm->interrupt_list_len; i++) + { + lm->interrupt_list[i].key = -1; + lm->interrupt_list[i].data_struct = NULL; + } + for (i = 0; i < lm->listener_list_len; i++) + { + lm->listener_list[i].key = -1; + lm->listener_list[i].data_struct = NULL; + } + for (i = 0; i < lm->pending_list_len; i++) + { + lm->pending_list[i].key = -1; + lm->pending_list[i].data_struct = NULL; + } + + lm->disconn_slaves = 0; + + lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK); + if (lm->timerfd < 0) + { + err = errno; + DBG ("timerfd: %s", strerror (err)); + return memif_syscall_error_handler (err); + } + + lm->arm.it_value.tv_sec = 2; + lm->arm.it_value.tv_nsec = 0; + lm->arm.it_interval.tv_sec = 2; + lm->arm.it_interval.tv_nsec = 0; + memset (&lm->disarm, 0, sizeof (lm->disarm)); + + if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0) + { + DBG ("callback type memif_control_fd_update_t error!"); + return MEMIF_ERR_CB_FDUPDATE; + } + + return 0; +} + +static inline memif_ring_t * +memif_get_ring (memif_connection_t * conn, memif_ring_type_t type, + uint16_t ring_num) +{ + if (&conn->regions[0] == NULL) + return NULL; + void *p = conn->regions[0].shm; + int ring_size = + sizeof (memif_ring_t) + + sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size); + p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size; + + return (memif_ring_t *) p; +} + +int +memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode, + uint16_t qid) +{ + memif_connection_t *conn = (memif_connection_t *) c; + if (conn == NULL) + return MEMIF_ERR_NOCONN; + uint8_t num = + (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->run_args. + num_m2s_rings; + if (qid >= num) + return MEMIF_ERR_QID; + + conn->rx_queues[qid].ring->flags = rx_mode; + DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags); + return MEMIF_ERR_SUCCESS; +} + +int +memif_create (memif_conn_handle_t * c, memif_conn_args_t * args, + memif_connection_update_t * on_connect, + memif_connection_update_t * on_disconnect, + memif_interrupt_t * on_interrupt, void *private_ctx) +{ + int err, i, index, sockfd = -1; + memif_list_elt_t list_elt; + memif_connection_t *conn = (memif_connection_t *) * c; + if (conn != NULL) + { + DBG ("This handle already points to existing memif."); + return MEMIF_ERR_CONN; + } + conn = (memif_connection_t *) malloc (sizeof (memif_connection_t)); + if (conn == NULL) + { + err = memif_syscall_error_handler (errno); + goto error; + } + memset (conn, 0, sizeof (memif_connection_t)); + + libmemif_main_t *lm = &libmemif_main; + + conn->args.interface_id = args->interface_id; + + if (args->log2_ring_size == 0) + args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE; + if (args->buffer_size == 0) + args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE; + if (args->num_s2m_rings == 0) + args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES; + if (args->num_m2s_rings == 0) + args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES; + + conn->args.num_s2m_rings = args->num_s2m_rings; + conn->args.num_m2s_rings = args->num_m2s_rings; + conn->args.buffer_size = args->buffer_size; + conn->args.log2_ring_size = args->log2_ring_size; + conn->args.is_master = args->is_master; + conn->args.mode = args->mode; + conn->msg_queue = NULL; + conn->regions = NULL; + conn->tx_queues = NULL; + conn->rx_queues = NULL; + conn->fd = -1; + conn->on_connect = on_connect; + conn->on_disconnect = on_disconnect; + conn->on_interrupt = on_interrupt; + conn->private_ctx = private_ctx; + memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t)); + + uint8_t l = strlen ((char *) args->interface_name); + strncpy ((char *) conn->args.interface_name, (char *) args->interface_name, + l); + + l = strlen ((char *) args->instance_name); + strncpy ((char *) conn->args.instance_name, (char *) args->instance_name, + l); + + /* allocate and initialize socket_filename so it can be copyed to sun_path + without memory leaks */ + conn->args.socket_filename = malloc (sizeof (char *) * 108); + memset (conn->args.socket_filename, 0, 108 * sizeof (char *)); + + if (args->socket_filename) + { + if (conn->args.socket_filename == NULL) + { + err = memif_syscall_error_handler (errno); + goto error; + } + strncpy ((char *) conn->args.socket_filename, + (char *) args->socket_filename, + strlen ((char *) args->socket_filename)); + } + else + { + uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR); + uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME); + if (conn->args.socket_filename == NULL) + { + err = memif_syscall_error_handler (errno); + goto error; + } + strncpy ((char *) conn->args.socket_filename, + MEMIF_DEFAULT_SOCKET_DIR, sdl); + conn->args.socket_filename[sdl] = '/'; + strncpy ((char *) (conn->args.socket_filename + 1 + sdl), + MEMIF_DEFAULT_SOCKET_FILENAME, sfl); + } + + if (args->secret) + { + l = strlen ((char *) args->secret); + strncpy ((char *) conn->args.secret, (char *) args->secret, l); + } + + if (conn->args.is_master) + { + conn->run_args.buffer_size = conn->args.buffer_size; + memif_socket_t *ms; + memif_list_elt_t elt; + for (i = 0; i < lm->listener_list_len; i++) + { + if ((ms = + (memif_socket_t *) lm->listener_list[i].data_struct) != NULL) + { + if (strncmp + ((char *) ms->filename, (char *) conn->args.socket_filename, + strlen ((char *) ms->filename)) == 0) + { + /* add interface to listener socket */ + elt.key = conn->args.interface_id; + *c = elt.data_struct = conn; + add_list_elt (&elt, &ms->interface_list, + &ms->interface_list_len); + ms->use_count++; + conn->listener_fd = ms->fd; + break; + } + } + else + { + struct stat file_stat; + if (stat ((char *) conn->args.socket_filename, &file_stat) == 0) + { + if (S_ISSOCK (file_stat.st_mode)) + unlink ((char *) conn->args.socket_filename); + else + return memif_syscall_error_handler (errno); + } + DBG ("creating socket file"); + ms = malloc (sizeof (memif_socket_t)); + ms->filename = malloc (strlen ((char *) conn->args. + socket_filename) + + sizeof (char)); + memset (ms->filename, 0, + strlen ((char *) conn->args.socket_filename) + + sizeof (char)); + strncpy ((char *) ms->filename, + (char *) conn->args.socket_filename, + strlen ((char *) conn->args.socket_filename)); + ms->interface_list_len = 1; + ms->interface_list = + malloc (sizeof (memif_list_elt_t) * ms->interface_list_len); + ms->interface_list[0].key = -1; + ms->interface_list[0].data_struct = NULL; + struct sockaddr_un un = { 0 }; + int on = 1; + + ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0); + if (ms->fd < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + DBG ("socket %d created", ms->fd); + un.sun_family = AF_UNIX; + strncpy ((char *) un.sun_path, (char *) ms->filename, + sizeof (un.sun_path) - 1); + DBG ("sockopt"); + if (setsockopt + (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + DBG ("bind"); + if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + DBG ("listen"); + if (listen (ms->fd, 1) < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + DBG ("stat"); + if (stat ((char *) ms->filename, &file_stat) < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + + /* add interface to listener socket */ + elt.key = conn->args.interface_id; + *c = elt.data_struct = conn; + add_list_elt (&elt, &ms->interface_list, + &ms->interface_list_len); + ms->use_count = 1; + conn->listener_fd = ms->fd; + + /* add listener socket to libmemif main */ + elt.key = ms->fd; + elt.data_struct = ms; + add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len); + lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ); + break; + } + } + } + else + { + if (lm->disconn_slaves == 0) + { + if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + } + + lm->disconn_slaves++; + + list_elt.key = -1; + *c = list_elt.data_struct = conn; + if ((index = + add_list_elt (&list_elt, &lm->control_list, + &lm->control_list_len)) < 0) + { + err = MEMIF_ERR_NOMEM; + goto error; + } + } + + conn->index = index; + + return 0; + +error: + if (sockfd > 0) + close (sockfd); + sockfd = -1; + if (conn->args.socket_filename) + free (conn->args.socket_filename); + if (conn != NULL) + free (conn); + *c = conn = NULL; + return err; +} + +int +memif_control_fd_handler (int fd, uint8_t events) +{ + int i, rv, sockfd = -1, err = MEMIF_ERR_SUCCESS; /* 0 */ + uint16_t num; + memif_list_elt_t *e = NULL; + memif_connection_t *conn; + libmemif_main_t *lm = &libmemif_main; + if (fd == lm->timerfd) + { + uint64_t b; + ssize_t size; + size = read (fd, &b, sizeof (b)); + for (i = 0; i < lm->control_list_len; i++) + { + if ((lm->control_list[i].key < 0) + && (lm->control_list[i].data_struct != NULL)) + { + conn = lm->control_list[i].data_struct; + if (conn->args.is_master) + continue; + + struct sockaddr_un sun; + sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0); + if (sockfd < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + + sun.sun_family = AF_UNIX; + + strncpy (sun.sun_path, conn->args.socket_filename, + sizeof (sun.sun_path) - 1); + + if (connect (sockfd, (struct sockaddr *) &sun, + sizeof (struct sockaddr_un)) == 0) + { + conn->fd = sockfd; + conn->read_fn = memif_conn_fd_read_ready; + conn->write_fn = memif_conn_fd_write_ready; + conn->error_fn = memif_conn_fd_error; + + lm->control_list[conn->index].key = conn->fd; + + lm->control_fd_update (sockfd, + MEMIF_FD_EVENT_READ | + MEMIF_FD_EVENT_WRITE); + + lm->disconn_slaves--; + if (lm->disconn_slaves == 0) + { + if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) + < 0) + { + err = memif_syscall_error_handler (errno); + goto error; + } + } + } + else + { + err = memif_syscall_error_handler (errno); + goto error; + } + } + } + } + else + { + get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd); + if (e != NULL) + { + if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL) + { + num = + (((memif_connection_t *) e->data_struct)->args. + is_master) ? ((memif_connection_t *) e->data_struct)-> + run_args.num_s2m_rings : ((memif_connection_t *) e-> + data_struct)->run_args. + num_m2s_rings; + for (i = 0; i < num; i++) + { + if (((memif_connection_t *) e->data_struct)->rx_queues[i]. + int_fd == fd) + { + ((memif_connection_t *) e->data_struct)->on_interrupt ((void *) e->data_struct, ((memif_connection_t *) e->data_struct)->private_ctx, i); + return MEMIF_ERR_SUCCESS; + } + } + } + return MEMIF_ERR_SUCCESS; + } + get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd); + if (e != NULL) + { + memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct); + return MEMIF_ERR_SUCCESS; + } + + get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd); + if (e != NULL) + { + memif_read_ready (fd); + return MEMIF_ERR_SUCCESS; + } + + get_list_elt (&e, lm->control_list, lm->control_list_len, fd); + if (e != NULL) + { + if (events & MEMIF_FD_EVENT_READ) + { + err = + ((memif_connection_t *) e->data_struct)->read_fn (e-> + data_struct); + if (err != MEMIF_ERR_SUCCESS) + return err; + } + if (events & MEMIF_FD_EVENT_WRITE) + { + err = + ((memif_connection_t *) e->data_struct)->write_fn (e-> + data_struct); + if (err != MEMIF_ERR_SUCCESS) + return err; + } + if (events & MEMIF_FD_EVENT_ERROR) + { + err = + ((memif_connection_t *) e->data_struct)->error_fn (e-> + data_struct); + if (err != MEMIF_ERR_SUCCESS) + return err; + } + } + } + + return MEMIF_ERR_SUCCESS; /* 0 */ + +error: + if (sockfd > 0) + close (sockfd); + sockfd = -1; + return err; +} + +int +memif_poll_event (int timeout) +{ + libmemif_main_t *lm = &libmemif_main; + memif_list_elt_t *elt; + struct epoll_event evt, *e; + int en = 0, err = MEMIF_ERR_SUCCESS, i = 0; /* 0 */ + uint16_t num; + uint32_t events = 0; + memset (&evt, 0, sizeof (evt)); + evt.events = EPOLLIN | EPOLLOUT; + sigset_t sigset; + sigemptyset (&sigset); + en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset); + if (en < 0) + { + DBG ("epoll_pwait: %s", strerror (errno)); + return -1; + } + if (en > 0) + { + if (evt.events & EPOLLIN) + events |= MEMIF_FD_EVENT_READ; + if (evt.events & EPOLLOUT) + events |= MEMIF_FD_EVENT_WRITE; + if (evt.events & EPOLLERR) + events |= MEMIF_FD_EVENT_ERROR; + err = memif_control_fd_handler (evt.data.fd, events); + return err; + } + return 0; +} + +static void +memif_msg_queue_free (memif_msg_queue_elt_t ** e) +{ + if (*e == NULL) + return; + memif_msg_queue_free (&(*e)->next); + free (*e); + *e = NULL; + return; +} + +/* send disconnect msg and close interface */ +int +memif_disconnect_internal (memif_connection_t * c) +{ + if (c == NULL) + { + DBG ("no connection"); + return MEMIF_ERR_NOCONN; + } + uint16_t num; + int err = MEMIF_ERR_SUCCESS, i; /* 0 */ + memif_queue_t *mq; + libmemif_main_t *lm = &libmemif_main; + memif_list_elt_t *e; + + c->on_disconnect ((void *) c, c->private_ctx); + + if (c->fd > 0) + { + memif_msg_send_disconnect (c->fd, "interface deleted", 0); + lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL); + close (c->fd); + } + get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd); + if (e != NULL) + { + if (c->args.is_master) + free_list_elt (lm->control_list, lm->control_list_len, c->fd); + e->key = c->fd = -1; + } + + if (c->tx_queues != NULL) + { + num = + (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args. + num_s2m_rings; + for (i = 0; i < num; i++) + { + mq = &c->tx_queues[i]; + if (mq != NULL) + { + if (mq->int_fd > 0) + close (mq->int_fd); + free_list_elt (lm->interrupt_list, lm->interrupt_list_len, + mq->int_fd); + mq->int_fd = -1; + } + } + free (c->tx_queues); + c->tx_queues = NULL; + } + + if (c->rx_queues != NULL) + { + num = + (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args. + num_m2s_rings; + for (i = 0; i < num; i++) + { + mq = &c->rx_queues[i]; + if (mq != NULL) + { + if (mq->int_fd > 0) + { + if (c->on_interrupt != NULL) + lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL); + close (mq->int_fd); + } + free_list_elt (lm->interrupt_list, lm->interrupt_list_len, + mq->int_fd); + mq->int_fd = -1; + } + } + free (c->rx_queues); + c->rx_queues = NULL; + } + + if (c->regions != NULL) + { + if (munmap (c->regions[0].shm, c->regions[0].region_size) < 0) + return memif_syscall_error_handler (errno); + if (c->regions[0].fd > 0) + close (c->regions[0].fd); + c->regions[0].fd = -1; + free (c->regions); + c->regions = NULL; + } + + memset (&c->run_args, 0, sizeof (memif_conn_run_args_t)); + + memif_msg_queue_free (&c->msg_queue); + + if (!(c->args.is_master)) + { + if (lm->disconn_slaves == 0) + { + if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0) + { + err = memif_syscall_error_handler (errno); + DBG_UNIX ("timerfd_settime: arm"); + } + } + lm->disconn_slaves++; + } + + return err; +} + +int +memif_delete (memif_conn_handle_t * conn) +{ + memif_connection_t *c = (memif_connection_t *) * conn; + if (c == NULL) + { + DBG ("no connection"); + return MEMIF_ERR_NOCONN; + } + libmemif_main_t *lm = &libmemif_main; + memif_list_elt_t *e = NULL; + memif_socket_t *ms = NULL; + + int err = MEMIF_ERR_SUCCESS; + + if (c->fd > 0) + { + DBG ("DISCONNECTING"); + err = memif_disconnect_internal (c); + if (err == MEMIF_ERR_NOCONN) + return err; + } + + free_list_elt_ctx (lm->control_list, lm->control_list_len, c); + + if (c->args.is_master) + { + get_list_elt (&e, lm->listener_list, lm->listener_list_len, + c->listener_fd); + if (e != NULL) + { + ms = (memif_socket_t *) e->data_struct; + ms->use_count--; + free_list_elt (ms->interface_list, ms->interface_list_len, + c->args.interface_id); + if (ms->use_count <= 0) + { + lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL); + free_list_elt (lm->listener_list, lm->listener_list_len, + c->listener_fd); + close (c->listener_fd); + c->listener_fd = ms->fd = -1; + free (ms->interface_list); + ms->interface_list = NULL; + free (ms->filename); + ms->filename = NULL; + free (ms); + ms = NULL; + } + } + } + else + { + lm->disconn_slaves--; + if (lm->disconn_slaves <= 0) + { + if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0) + { + err = memif_syscall_error_handler (errno); + DBG ("timerfd_settime: disarm"); + } + } + } + + if (c->args.socket_filename) + free (c->args.socket_filename); + c->args.socket_filename = NULL; + + free (c); + c = NULL; + + *conn = c; + return err; +} + +int +memif_connect1 (memif_connection_t * c) +{ + libmemif_main_t *lm = &libmemif_main; + memif_region_t *mr = c->regions; + memif_queue_t *mq; + int i; + uint16_t num; + + if (mr != NULL) + { + if (!mr->shm) + { + if (mr->fd < 0) + return MEMIF_ERR_NO_SHMFD; + + if ((mr->shm = mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE, + MAP_SHARED, mr->fd, 0)) == MAP_FAILED) + { + return memif_syscall_error_handler (errno); + } + } + } + + num = + (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args. + num_s2m_rings; + for (i = 0; i < num; i++) + { + mq = &c->tx_queues[i]; + if (mq != NULL) + { + mq->ring = c->regions[mq->region].shm + mq->offset; + if (mq->ring->cookie != MEMIF_COOKIE) + { + DBG ("wrong cookie on tx ring %u", i); + return MEMIF_ERR_COOKIE; + } + mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs = + 0; + } + } + num = + (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args. + num_m2s_rings; + for (i = 0; i < num; i++) + { + mq = &c->rx_queues[i]; + if (mq != NULL) + { + mq->ring = c->regions[mq->region].shm + mq->offset; + if (mq->ring->cookie != MEMIF_COOKIE) + { + DBG ("wrong cookie on rx ring %u", i); + return MEMIF_ERR_COOKIE; + } + mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs = + 0; + } + } + + lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD); + + return 0; +} + +int +memif_init_regions_and_queues (memif_connection_t * conn) +{ + memif_ring_t *ring = NULL; + uint64_t buffer_offset; + memif_region_t *r; + int i, j; + libmemif_main_t *lm = &libmemif_main; + memif_list_elt_t e; + + conn->regions = (memif_region_t *) malloc (sizeof (memif_region_t)); + if (conn->regions == NULL) + return memif_syscall_error_handler (errno); + r = conn->regions; + + buffer_offset = + (conn->run_args.num_s2m_rings + + conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) + + sizeof (memif_desc_t) * + (1 << conn->run_args.log2_ring_size)); + + r->region_size = buffer_offset + + conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) * + (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings); + + if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1) + return memif_syscall_error_handler (errno); +/* + if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1) + return memif_syscall_error_handler (errno); +*/ + if ((ftruncate (r->fd, r->region_size)) == -1) + return memif_syscall_error_handler (errno); + + if ((r->shm = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE, + MAP_SHARED, r->fd, 0)) == MAP_FAILED) + return memif_syscall_error_handler (errno); + + for (i = 0; i < conn->run_args.num_s2m_rings; i++) + { + ring = memif_get_ring (conn, MEMIF_RING_S2M, i); + DBG ("RING: %p I: %d", ring, i); + ring->head = ring->tail = 0; + ring->cookie = MEMIF_COOKIE; + ring->flags = 0; + for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++) + { + uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j; + ring->desc[j].region = 0; + ring->desc[j].offset = buffer_offset + + (uint32_t) (slot * conn->run_args.buffer_size); + ring->desc[j].buffer_length = conn->run_args.buffer_size; + } + } + for (i = 0; i < conn->run_args.num_m2s_rings; i++) + { + ring = memif_get_ring (conn, MEMIF_RING_M2S, i); + DBG ("RING: %p I: %d", ring, i); + ring->head = ring->tail = 0; + ring->cookie = MEMIF_COOKIE; + ring->flags = 0; + for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++) + { + uint16_t slot = + (i + + conn->run_args.num_s2m_rings) * + (1 << conn->run_args.log2_ring_size) + j; + ring->desc[j].region = 0; + ring->desc[j].offset = buffer_offset + + (uint32_t) (slot * conn->run_args.buffer_size); + ring->desc[j].buffer_length = conn->run_args.buffer_size; + } + } + memif_queue_t *mq; + mq = + (memif_queue_t *) malloc (sizeof (memif_queue_t) * + conn->run_args.num_s2m_rings); + if (mq == NULL) + return memif_syscall_error_handler (errno); + int x; + for (x = 0; x < conn->run_args.num_s2m_rings; x++) + { + if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0) + return memif_syscall_error_handler (errno); + /* add int fd to interrupt fd list */ + e.key = mq[x].int_fd; + e.data_struct = conn; + add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len); + + mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x); + DBG ("RING: %p I: %d", mq[x].ring, x); + mq[x].log2_ring_size = conn->run_args.log2_ring_size; + mq[x].region = 0; + mq[x].offset = + (void *) mq[x].ring - (void *) conn->regions[mq->region].shm; + mq[x].last_head = 0; + mq[x].alloc_bufs = 0; + } + conn->tx_queues = mq; + + mq = + (memif_queue_t *) malloc (sizeof (memif_queue_t) * + conn->run_args.num_m2s_rings); + if (mq == NULL) + return memif_syscall_error_handler (errno); + for (x = 0; x < conn->run_args.num_m2s_rings; x++) + { + if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0) + return memif_syscall_error_handler (errno); + /* add int fd to interrupt fd list */ + e.key = mq[x].int_fd; + e.data_struct = conn; + add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len); + + mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x); + DBG ("RING: %p I: %d", mq[x].ring, x); + mq[x].log2_ring_size = conn->run_args.log2_ring_size; + mq[x].region = 0; + mq[x].offset = + (void *) mq[x].ring - (void *) conn->regions[mq->region].shm; + mq[x].last_head = 0; + mq[x].alloc_bufs = 0; + } + conn->rx_queues = mq; + + return 0; +} + +int +memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, + uint16_t * count_out) +{ + memif_connection_t *c = (memif_connection_t *) conn; + if (c == NULL) + return MEMIF_ERR_NOCONN; + if (c->fd < 0) + return MEMIF_ERR_DISCONNECTED; + uint8_t num = + (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args. + num_s2m_rings; + if (qid >= num) + return MEMIF_ERR_QID; + memif_queue_t *mq = &c->tx_queues[qid]; + memif_ring_t *ring = mq->ring; + memif_buffer_t *b0, *b1; + uint16_t mask = (1 << mq->log2_ring_size) - 1; + uint16_t s0, s1, ns; + *count_out = 0; + int err = MEMIF_ERR_SUCCESS; /* 0 */ + + if (ring->tail != ring->head) + { + if (ring->head > ring->tail) + ns = (1 << mq->log2_ring_size) - ring->head + ring->tail; + else + ns = ring->tail - ring->head; + } + else + ns = (1 << mq->log2_ring_size); + + /* (head == tail) ? receive function will asume that no packets are available */ + ns -= 1; + + while (count && ns) + { + while ((count > 2) && (ns > 2)) + { + s0 = (ring->head + mq->alloc_bufs + *count_out) & mask; + s1 = (ring->head + mq->alloc_bufs + *count_out + 1) & mask; + + b0 = (bufs + *count_out); + b1 = (bufs + *count_out + 1); + + b0->desc_index = s0; + b1->desc_index = s1; + b0->buffer_len = ring->desc[s0].buffer_length; + b1->buffer_len = ring->desc[s1].buffer_length; + /* TODO: support multiple regions -> ring descriptor contains region index */ + b0->data = c->regions->shm + ring->desc[s0].offset; + b1->data = c->regions->shm + ring->desc[s1].offset; + + DBG ("allocated ring slots %u, %u", s0, s1); + count -= 2; + ns -= 2; + *count_out += 2; + } + s0 = (ring->head + mq->alloc_bufs + *count_out) & mask; + + b0 = (bufs + *count_out); + + b0->desc_index = s0; + b0->buffer_len = ring->desc[s0].buffer_length; + b0->data = c->regions->shm + ring->desc[s0].offset; + + DBG ("allocated ring slot %u", s0); + count--; + ns--; + *count_out += 1; + } + + mq->alloc_bufs += *count_out; + DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count, + mq->alloc_bufs); + + if (count) + { + DBG ("ring buffer full! qid: %u", qid); + err = MEMIF_ERR_NOBUF_RING; + } + + return err; +} + +int +memif_buffer_free (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, + uint16_t * count_out) +{ + memif_connection_t *c = (memif_connection_t *) conn; + if (c == NULL) + return MEMIF_ERR_NOCONN; + if (c->fd < 0) + return MEMIF_ERR_DISCONNECTED; + uint8_t num = + (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args. + num_m2s_rings; + if (qid >= num) + return MEMIF_ERR_QID; + libmemif_main_t *lm = &libmemif_main; + memif_queue_t *mq = &c->rx_queues[qid]; + memif_ring_t *ring = mq->ring; + uint16_t tail = ring->tail; + uint16_t mask = (1 << mq->log2_ring_size) - 1; + memif_buffer_t *b0, *b1; + *count_out = 0; + + if (mq->alloc_bufs < count) + count = mq->alloc_bufs; + + while (count) + { + while (count > 2) + { + b0 = (bufs + *count_out); + b1 = (bufs + *count_out + 1); + tail = (b0->desc_index + 1) & mask; + tail = (b1->desc_index + 1) & mask; + b0->data = NULL; + b1->data = NULL; + + count -= 2; + *count_out += 2; + mq->alloc_bufs -= 2; + } + b0 = (bufs + *count_out); + tail = (b0->desc_index + 1) & mask; + b0->data = NULL; + + count--; + *count_out += 1; + mq->alloc_bufs--; + } + MEMIF_MEORY_BARRIER (); + ring->tail = tail; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +int +memif_tx_burst (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, uint16_t * tx) +{ + memif_connection_t *c = (memif_connection_t *) conn; + if (c == NULL) + return MEMIF_ERR_NOCONN; + if (c->fd < 0) + return MEMIF_ERR_DISCONNECTED; + uint8_t num = + (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args. + num_s2m_rings; + if (qid >= num) + return MEMIF_ERR_QID; + memif_queue_t *mq = &c->tx_queues[qid]; + memif_ring_t *ring = mq->ring; + uint16_t head = ring->head; + uint16_t mask = (1 << mq->log2_ring_size) - 1; + *tx = 0; + memif_buffer_t *b0, *b1; + + while (count) + { + while (count > 2) + { + b0 = (bufs + *tx); + b1 = (bufs + *tx + 1); + ring->desc[b0->desc_index].length = b0->data_len; + ring->desc[b1->desc_index].length = b1->data_len; + +#ifdef MEMIF_DBG_SHM + print_bytes (b0->data, b0->data_len, DBG_TX_BUF); + print_bytes (b1->data, b1->data_len, DBG_TX_BUF); +#endif + + head = (b0->desc_index + 1) & mask; + head = (b1->desc_index + 1) & mask; + + b0->data = NULL; + b0->data_len = 0; + b1->data = NULL; + b1->data_len = 0; + + count -= 2; + *tx += 2; + } + + b0 = (bufs + *tx); + ring->desc[b0->desc_index].length = b0->data_len; + +#ifdef MEMIF_DBG_SHM + print_bytes (b0->data, b0->data_len, DBG_TX_BUF); +#endif + + head = (b0->desc_index + 1) & mask; + + b0->data = NULL; + b0->data_len = 0; + + count--; + *tx += 1; + } + MEMIF_MEORY_BARRIER (); + ring->head = head; + + mq->alloc_bufs -= *tx; + + if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0) + { + uint64_t a = 1; + int r = write (mq->int_fd, &a, sizeof (a)); + if (r < 0) + return MEMIF_ERR_INT_WRITE; + } + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +int +memif_rx_burst (memif_conn_handle_t conn, uint16_t qid, + memif_buffer_t * bufs, uint16_t count, uint16_t * rx) +{ + memif_connection_t *c = (memif_connection_t *) conn; + if (c == NULL) + return MEMIF_ERR_NOCONN; + if (c->fd < 0) + return MEMIF_ERR_DISCONNECTED; + uint8_t num = + (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args. + num_m2s_rings; + if (qid >= num) + return MEMIF_ERR_QID; + memif_queue_t *mq = &c->rx_queues[qid]; + memif_ring_t *ring = mq->ring; + uint16_t head = ring->head; + uint16_t ns; + uint16_t mask = (1 << mq->log2_ring_size) - 1; + memif_buffer_t *b0, *b1; + *rx = 0; + + uint64_t b; + ssize_t r = read (mq->int_fd, &b, sizeof (b)); + if ((r == -1) && (errno != EAGAIN)) + return memif_syscall_error_handler (errno); + + if (head == mq->last_head) + return 0; + + if (head > mq->last_head) + ns = head - mq->last_head; + else + ns = (1 << mq->log2_ring_size) - mq->last_head + head; + + while (ns && count) + { + while ((ns > 2) && (count > 2)) + { + b0 = (bufs + *rx); + b1 = (bufs + *rx + 1); + + b0->desc_index = mq->last_head; + b1->desc_index = mq->last_head + 1; + b0->data = memif_get_buffer (conn, ring, mq->last_head); + b1->data = memif_get_buffer (conn, ring, mq->last_head + 1); + b0->data_len = ring->desc[mq->last_head].length; + b1->data_len = ring->desc[mq->last_head + 1].length; + b0->buffer_len = ring->desc[mq->last_head].buffer_length; + b1->buffer_len = ring->desc[mq->last_head + 1].buffer_length; + +#ifdef MEMIF_DBG_SHM + print_bytes (b0->data, b0->data_len, DBG_RX_BUF); + print_bytes (b1->data, b1->data_len, DBG_RX_BUF); +#endif + + mq->last_head = (mq->last_head + 2) & mask; + + ns -= 2; + count -= 2; + *rx += 2; + } + b0 = (bufs + *rx); + + b0->desc_index = mq->last_head; + b0->data = memif_get_buffer (conn, ring, mq->last_head); + b0->data_len = ring->desc[mq->last_head].length; + b0->buffer_len = ring->desc[mq->last_head].buffer_length; + +#ifdef MEMIF_DBG_SHM + print_bytes (b0->data, b0->data_len, DBG_RX_BUF); +#endif + + mq->last_head = (mq->last_head + 1) & mask; + + ns--; + count--; + *rx += 1; + } + + mq->alloc_bufs += *rx; + + if (ns) + { + DBG ("not enough buffers!"); + return MEMIF_ERR_NOBUF; + } + + return MEMIF_ERR_SUCCESS; /* 0 */ +} + +int +memif_get_details (memif_conn_handle_t conn, memif_details_t * md, + char *buf, ssize_t buflen) +{ + memif_connection_t *c = (memif_connection_t *) conn; + if (c == NULL) + return MEMIF_ERR_NOCONN; + + int err = MEMIF_ERR_SUCCESS, i; + ssize_t l0, l1, total_l; + l0 = 0; + + l1 = strlen ((char *) c->args.interface_name); + if (l0 + l1 <= buflen) + { + md->if_name = strncpy (buf + l0, (char *) c->args.interface_name, l1); + md->if_name[l0 + l1] = '\0'; + l0 += l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + l1 = strlen ((char *) c->args.instance_name); + if (l0 + l1 <= buflen) + { + md->inst_name = strncpy (buf + l0, (char *) c->args.instance_name, l1); + md->inst_name[l0 + l1] = '\0'; + l0 += l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + l1 = strlen ((char *) c->remote_if_name); + if (l0 + l1 <= buflen) + { + md->remote_if_name = strncpy (buf + l0, (char *) c->remote_if_name, l1); + md->remote_if_name[l0 + l1] = '\0'; + l0 += l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + l1 = strlen ((char *) c->remote_name); + if (l0 + l1 <= buflen) + { + md->remote_inst_name = strncpy (buf + l0, (char *) c->remote_name, l1); + md->remote_inst_name[l0 + l1] = '\0'; + l0 += l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + md->id = c->args.interface_id; + + if (c->args.secret) + { + l1 = strlen ((char *) c->args.secret); + md->secret = strncpy (buf + l0, (char *) c->args.secret, l1); + md->secret[l0 + l1] = '\0'; + l0 += l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + md->role = (c->args.is_master) ? 0 : 1; + md->mode = c->args.mode; + + l1 = strlen ((char *) c->args.socket_filename); + if (l0 + l1 <= buflen) + { + md->socket_filename = + strncpy (buf + l0, (char *) c->args.socket_filename, l1); + md->socket_filename[l0 + l1] = '\0'; + l0 += l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + md->rx_queues_num = + (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args. + num_m2s_rings; + + l1 = sizeof (memif_queue_details_t) * md->rx_queues_num; + if (l0 + l1 <= buflen) + { + md->rx_queues = (memif_queue_details_t *) buf + l0; + l0 = l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + for (i = 0; i < md->rx_queues_num; i++) + { + md->rx_queues[i].qid = i; + md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size); + md->rx_queues[i].buffer_size = c->run_args.buffer_size; + } + + md->tx_queues_num = + (c->args.is_master) ? c->run_args.num_m2s_rings : c->run_args. + num_s2m_rings; + + l1 = sizeof (memif_queue_details_t) * md->tx_queues_num; + if (l0 + l1 <= buflen) + { + md->tx_queues = (memif_queue_details_t *) buf + l0; + l0 = l1 + 1; + } + else + err = MEMIF_ERR_NOBUF_DET; + + for (i = 0; i < md->tx_queues_num; i++) + { + md->tx_queues[i].qid = i; + md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size); + md->tx_queues[i].buffer_size = c->run_args.buffer_size; + } + + md->link_up_down = (c->fd > 0) ? 1 : 0; + + return err; /* 0 */ +} + +int +memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd) +{ + memif_connection_t *c = (memif_connection_t *) conn; + *efd = -1; + if (c == NULL) + return MEMIF_ERR_NOCONN; + if (c->fd < 0) + return MEMIF_ERR_DISCONNECTED; + uint8_t num = + (c->args.is_master) ? c->run_args.num_s2m_rings : c->run_args. + num_m2s_rings; + if (qid >= num) + return MEMIF_ERR_QID; + + *efd = c->rx_queues[qid].int_fd; + + return MEMIF_ERR_SUCCESS; +} + +int +memif_cleanup () +{ + libmemif_main_t *lm = &libmemif_main; + if (lm->app_name) + free (lm->app_name); + lm->app_name = NULL; + if (lm->control_list) + free (lm->control_list); + lm->control_list = NULL; + if (lm->interrupt_list) + free (lm->interrupt_list); + lm->interrupt_list = NULL; + if (lm->listener_list) + free (lm->listener_list); + lm->listener_list = NULL; + if (lm->pending_list) + free (lm->pending_list); + lm->pending_list = NULL; + + return MEMIF_ERR_SUCCESS; /* 0 */ +} |