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-rw-r--r--qemu/contrib/ivshmem-server/ivshmem-server.c457
1 files changed, 0 insertions, 457 deletions
diff --git a/qemu/contrib/ivshmem-server/ivshmem-server.c b/qemu/contrib/ivshmem-server/ivshmem-server.c
deleted file mode 100644
index 172db78b3..000000000
--- a/qemu/contrib/ivshmem-server/ivshmem-server.c
+++ /dev/null
@@ -1,457 +0,0 @@
-/*
- * Copyright 6WIND S.A., 2014
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or
- * (at your option) any later version. See the COPYING file in the
- * top-level directory.
- */
-#include "qemu/osdep.h"
-#include "qemu-common.h"
-#include "qemu/sockets.h"
-
-#include <sys/mman.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-
-#include "ivshmem-server.h"
-
-/* log a message on stdout if verbose=1 */
-#define IVSHMEM_SERVER_DEBUG(server, fmt, ...) do { \
- if ((server)->verbose) { \
- printf(fmt, ## __VA_ARGS__); \
- } \
- } while (0)
-
-/** maximum size of a huge page, used by ivshmem_server_ftruncate() */
-#define IVSHMEM_SERVER_MAX_HUGEPAGE_SIZE (1024 * 1024 * 1024)
-
-/** default listen backlog (number of sockets not accepted) */
-#define IVSHMEM_SERVER_LISTEN_BACKLOG 10
-
-/* send message to a client unix socket */
-static int
-ivshmem_server_send_one_msg(int sock_fd, int64_t peer_id, int fd)
-{
- int ret;
- struct msghdr msg;
- struct iovec iov[1];
- union {
- struct cmsghdr cmsg;
- char control[CMSG_SPACE(sizeof(int))];
- } msg_control;
- struct cmsghdr *cmsg;
-
- peer_id = GINT64_TO_LE(peer_id);
- iov[0].iov_base = &peer_id;
- iov[0].iov_len = sizeof(peer_id);
-
- memset(&msg, 0, sizeof(msg));
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
-
- /* if fd is specified, add it in a cmsg */
- if (fd >= 0) {
- memset(&msg_control, 0, sizeof(msg_control));
- msg.msg_control = &msg_control;
- msg.msg_controllen = sizeof(msg_control);
- cmsg = CMSG_FIRSTHDR(&msg);
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- cmsg->cmsg_len = CMSG_LEN(sizeof(int));
- memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
- }
-
- ret = sendmsg(sock_fd, &msg, 0);
- if (ret <= 0) {
- return -1;
- }
-
- return 0;
-}
-
-/* free a peer when the server advertises a disconnection or when the
- * server is freed */
-static void
-ivshmem_server_free_peer(IvshmemServer *server, IvshmemServerPeer *peer)
-{
- unsigned vector;
- IvshmemServerPeer *other_peer;
-
- IVSHMEM_SERVER_DEBUG(server, "free peer %" PRId64 "\n", peer->id);
- close(peer->sock_fd);
- QTAILQ_REMOVE(&server->peer_list, peer, next);
-
- /* advertise the deletion to other peers */
- QTAILQ_FOREACH(other_peer, &server->peer_list, next) {
- ivshmem_server_send_one_msg(other_peer->sock_fd, peer->id, -1);
- }
-
- for (vector = 0; vector < peer->vectors_count; vector++) {
- event_notifier_cleanup(&peer->vectors[vector]);
- }
-
- g_free(peer);
-}
-
-/* send the peer id and the shm_fd just after a new client connection */
-static int
-ivshmem_server_send_initial_info(IvshmemServer *server, IvshmemServerPeer *peer)
-{
- int ret;
-
- /* send our protocol version first */
- ret = ivshmem_server_send_one_msg(peer->sock_fd, IVSHMEM_PROTOCOL_VERSION,
- -1);
- if (ret < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot send version: %s\n",
- strerror(errno));
- return -1;
- }
-
- /* send the peer id to the client */
- ret = ivshmem_server_send_one_msg(peer->sock_fd, peer->id, -1);
- if (ret < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot send peer id: %s\n",
- strerror(errno));
- return -1;
- }
-
- /* send the shm_fd */
- ret = ivshmem_server_send_one_msg(peer->sock_fd, -1, server->shm_fd);
- if (ret < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot send shm fd: %s\n",
- strerror(errno));
- return -1;
- }
-
- return 0;
-}
-
-/* handle message on listening unix socket (new client connection) */
-static int
-ivshmem_server_handle_new_conn(IvshmemServer *server)
-{
- IvshmemServerPeer *peer, *other_peer;
- struct sockaddr_un unaddr;
- socklen_t unaddr_len;
- int newfd;
- unsigned i;
-
- /* accept the incoming connection */
- unaddr_len = sizeof(unaddr);
- newfd = qemu_accept(server->sock_fd,
- (struct sockaddr *)&unaddr, &unaddr_len);
-
- if (newfd < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot accept() %s\n", strerror(errno));
- return -1;
- }
-
- qemu_set_nonblock(newfd);
- IVSHMEM_SERVER_DEBUG(server, "accept()=%d\n", newfd);
-
- /* allocate new structure for this peer */
- peer = g_malloc0(sizeof(*peer));
- peer->sock_fd = newfd;
-
- /* get an unused peer id */
- /* XXX: this could use id allocation such as Linux IDA, or simply
- * a free-list */
- for (i = 0; i < G_MAXUINT16; i++) {
- if (ivshmem_server_search_peer(server, server->cur_id) == NULL) {
- break;
- }
- server->cur_id++;
- }
- if (i == G_MAXUINT16) {
- IVSHMEM_SERVER_DEBUG(server, "cannot allocate new client id\n");
- close(newfd);
- g_free(peer);
- return -1;
- }
- peer->id = server->cur_id++;
-
- /* create eventfd, one per vector */
- peer->vectors_count = server->n_vectors;
- for (i = 0; i < peer->vectors_count; i++) {
- if (event_notifier_init(&peer->vectors[i], FALSE) < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot create eventfd\n");
- goto fail;
- }
- }
-
- /* send peer id and shm fd */
- if (ivshmem_server_send_initial_info(server, peer) < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot send initial info\n");
- goto fail;
- }
-
- /* advertise the new peer to others */
- QTAILQ_FOREACH(other_peer, &server->peer_list, next) {
- for (i = 0; i < peer->vectors_count; i++) {
- ivshmem_server_send_one_msg(other_peer->sock_fd, peer->id,
- peer->vectors[i].wfd);
- }
- }
-
- /* advertise the other peers to the new one */
- QTAILQ_FOREACH(other_peer, &server->peer_list, next) {
- for (i = 0; i < peer->vectors_count; i++) {
- ivshmem_server_send_one_msg(peer->sock_fd, other_peer->id,
- other_peer->vectors[i].wfd);
- }
- }
-
- /* advertise the new peer to itself */
- for (i = 0; i < peer->vectors_count; i++) {
- ivshmem_server_send_one_msg(peer->sock_fd, peer->id,
- event_notifier_get_fd(&peer->vectors[i]));
- }
-
- QTAILQ_INSERT_TAIL(&server->peer_list, peer, next);
- IVSHMEM_SERVER_DEBUG(server, "new peer id = %" PRId64 "\n",
- peer->id);
- return 0;
-
-fail:
- while (i--) {
- event_notifier_cleanup(&peer->vectors[i]);
- }
- close(newfd);
- g_free(peer);
- return -1;
-}
-
-/* Try to ftruncate a file to next power of 2 of shmsize.
- * If it fails; all power of 2 above shmsize are tested until
- * we reach the maximum huge page size. This is useful
- * if the shm file is in a hugetlbfs that cannot be truncated to the
- * shm_size value. */
-static int
-ivshmem_server_ftruncate(int fd, unsigned shmsize)
-{
- int ret;
- struct stat mapstat;
-
- /* align shmsize to next power of 2 */
- shmsize = pow2ceil(shmsize);
-
- if (fstat(fd, &mapstat) != -1 && mapstat.st_size == shmsize) {
- return 0;
- }
-
- while (shmsize <= IVSHMEM_SERVER_MAX_HUGEPAGE_SIZE) {
- ret = ftruncate(fd, shmsize);
- if (ret == 0) {
- return ret;
- }
- shmsize *= 2;
- }
-
- return -1;
-}
-
-/* Init a new ivshmem server */
-int
-ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path,
- const char *shm_path, bool use_shm_open,
- size_t shm_size, unsigned n_vectors,
- bool verbose)
-{
- int ret;
-
- memset(server, 0, sizeof(*server));
- server->verbose = verbose;
-
- ret = snprintf(server->unix_sock_path, sizeof(server->unix_sock_path),
- "%s", unix_sock_path);
- if (ret < 0 || ret >= sizeof(server->unix_sock_path)) {
- IVSHMEM_SERVER_DEBUG(server, "could not copy unix socket path\n");
- return -1;
- }
- ret = snprintf(server->shm_path, sizeof(server->shm_path),
- "%s", shm_path);
- if (ret < 0 || ret >= sizeof(server->shm_path)) {
- IVSHMEM_SERVER_DEBUG(server, "could not copy shm path\n");
- return -1;
- }
-
- server->use_shm_open = use_shm_open;
- server->shm_size = shm_size;
- server->n_vectors = n_vectors;
-
- QTAILQ_INIT(&server->peer_list);
-
- return 0;
-}
-
-/* open shm, create and bind to the unix socket */
-int
-ivshmem_server_start(IvshmemServer *server)
-{
- struct sockaddr_un sun;
- int shm_fd, sock_fd, ret;
-
- /* open shm file */
- if (server->use_shm_open) {
- IVSHMEM_SERVER_DEBUG(server, "Using POSIX shared memory: %s\n",
- server->shm_path);
- shm_fd = shm_open(server->shm_path, O_CREAT | O_RDWR, S_IRWXU);
- } else {
- gchar *filename = g_strdup_printf("%s/ivshmem.XXXXXX", server->shm_path);
- IVSHMEM_SERVER_DEBUG(server, "Using file-backed shared memory: %s\n",
- server->shm_path);
- shm_fd = mkstemp(filename);
- unlink(filename);
- g_free(filename);
- }
-
- if (shm_fd < 0) {
- fprintf(stderr, "cannot open shm file %s: %s\n", server->shm_path,
- strerror(errno));
- return -1;
- }
- if (ivshmem_server_ftruncate(shm_fd, server->shm_size) < 0) {
- fprintf(stderr, "ftruncate(%s) failed: %s\n", server->shm_path,
- strerror(errno));
- goto err_close_shm;
- }
-
- IVSHMEM_SERVER_DEBUG(server, "create & bind socket %s\n",
- server->unix_sock_path);
-
- /* create the unix listening socket */
- sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock_fd < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot create socket: %s\n",
- strerror(errno));
- goto err_close_shm;
- }
-
- sun.sun_family = AF_UNIX;
- ret = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s",
- server->unix_sock_path);
- if (ret < 0 || ret >= sizeof(sun.sun_path)) {
- IVSHMEM_SERVER_DEBUG(server, "could not copy unix socket path\n");
- goto err_close_sock;
- }
- if (bind(sock_fd, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
- IVSHMEM_SERVER_DEBUG(server, "cannot connect to %s: %s\n", sun.sun_path,
- strerror(errno));
- goto err_close_sock;
- }
-
- if (listen(sock_fd, IVSHMEM_SERVER_LISTEN_BACKLOG) < 0) {
- IVSHMEM_SERVER_DEBUG(server, "listen() failed: %s\n", strerror(errno));
- goto err_close_sock;
- }
-
- server->sock_fd = sock_fd;
- server->shm_fd = shm_fd;
-
- return 0;
-
-err_close_sock:
- close(sock_fd);
-err_close_shm:
- close(shm_fd);
- return -1;
-}
-
-/* close connections to clients, the unix socket and the shm fd */
-void
-ivshmem_server_close(IvshmemServer *server)
-{
- IvshmemServerPeer *peer, *npeer;
-
- IVSHMEM_SERVER_DEBUG(server, "close server\n");
-
- QTAILQ_FOREACH_SAFE(peer, &server->peer_list, next, npeer) {
- ivshmem_server_free_peer(server, peer);
- }
-
- unlink(server->unix_sock_path);
- close(server->sock_fd);
- close(server->shm_fd);
- server->sock_fd = -1;
- server->shm_fd = -1;
-}
-
-/* get the fd_set according to the unix socket and the peer list */
-void
-ivshmem_server_get_fds(const IvshmemServer *server, fd_set *fds, int *maxfd)
-{
- IvshmemServerPeer *peer;
-
- if (server->sock_fd == -1) {
- return;
- }
-
- FD_SET(server->sock_fd, fds);
- if (server->sock_fd >= *maxfd) {
- *maxfd = server->sock_fd + 1;
- }
-
- QTAILQ_FOREACH(peer, &server->peer_list, next) {
- FD_SET(peer->sock_fd, fds);
- if (peer->sock_fd >= *maxfd) {
- *maxfd = peer->sock_fd + 1;
- }
- }
-}
-
-/* process incoming messages on the sockets in fd_set */
-int
-ivshmem_server_handle_fds(IvshmemServer *server, fd_set *fds, int maxfd)
-{
- IvshmemServerPeer *peer, *peer_next;
-
- if (server->sock_fd < maxfd && FD_ISSET(server->sock_fd, fds) &&
- ivshmem_server_handle_new_conn(server) < 0 && errno != EINTR) {
- IVSHMEM_SERVER_DEBUG(server, "ivshmem_server_handle_new_conn() "
- "failed\n");
- return -1;
- }
-
- QTAILQ_FOREACH_SAFE(peer, &server->peer_list, next, peer_next) {
- /* any message from a peer socket result in a close() */
- IVSHMEM_SERVER_DEBUG(server, "peer->sock_fd=%d\n", peer->sock_fd);
- if (peer->sock_fd < maxfd && FD_ISSET(peer->sock_fd, fds)) {
- ivshmem_server_free_peer(server, peer);
- }
- }
-
- return 0;
-}
-
-/* lookup peer from its id */
-IvshmemServerPeer *
-ivshmem_server_search_peer(IvshmemServer *server, int64_t peer_id)
-{
- IvshmemServerPeer *peer;
-
- QTAILQ_FOREACH(peer, &server->peer_list, next) {
- if (peer->id == peer_id) {
- return peer;
- }
- }
- return NULL;
-}
-
-/* dump our info, the list of peers their vectors on stdout */
-void
-ivshmem_server_dump(const IvshmemServer *server)
-{
- const IvshmemServerPeer *peer;
- unsigned vector;
-
- /* dump peers */
- QTAILQ_FOREACH(peer, &server->peer_list, next) {
- printf("peer_id = %" PRId64 "\n", peer->id);
-
- for (vector = 0; vector < peer->vectors_count; vector++) {
- printf(" vector %d is enabled (fd=%d)\n", vector,
- event_notifier_get_fd(&peer->vectors[vector]));
- }
- }
-}