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authorJakub Grajciar <grajciar.jakub@gmail.com>2017-08-30 10:13:25 +0200
committerDamjan Marion <dmarion.lists@gmail.com>2017-09-13 20:12:54 +0000
commit7c5c40db2a8d71a857ae63b6238cfac6e257da6d (patch)
treef0c01c2087ffd67e770d6f7932849ba13f44f12f /extras/libmemif/src/main.c
parenta4393be1a03f6a8f8da5d53c22b8dca52fed6f51 (diff)
Shared memory packet interface (memif) library
Change-Id: I5097462ae85acd705f19e92517c01094dba7565f Signed-off-by: Jakub Grajciar <grajciar.jakub@gmail.com>
Diffstat (limited to 'extras/libmemif/src/main.c')
-rw-r--r--extras/libmemif/src/main.c1810
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 */
+}