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-rw-r--r--qemu/contrib/ivshmem-client/ivshmem-client.c446
1 files changed, 0 insertions, 446 deletions
diff --git a/qemu/contrib/ivshmem-client/ivshmem-client.c b/qemu/contrib/ivshmem-client/ivshmem-client.c
deleted file mode 100644
index 44ae3646e..000000000
--- a/qemu/contrib/ivshmem-client/ivshmem-client.c
+++ /dev/null
@@ -1,446 +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 <sys/socket.h>
-#include <sys/un.h>
-
-#include "qemu-common.h"
-#include "qemu/queue.h"
-
-#include "ivshmem-client.h"
-
-/* log a message on stdout if verbose=1 */
-#define IVSHMEM_CLIENT_DEBUG(client, fmt, ...) do { \
- if ((client)->verbose) { \
- printf(fmt, ## __VA_ARGS__); \
- } \
- } while (0)
-
-/* read message from the unix socket */
-static int
-ivshmem_client_read_one_msg(IvshmemClient *client, int64_t *index, 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;
-
- iov[0].iov_base = index;
- iov[0].iov_len = sizeof(*index);
-
- memset(&msg, 0, sizeof(msg));
- msg.msg_iov = iov;
- msg.msg_iovlen = 1;
- msg.msg_control = &msg_control;
- msg.msg_controllen = sizeof(msg_control);
-
- ret = recvmsg(client->sock_fd, &msg, 0);
- if (ret < sizeof(*index)) {
- IVSHMEM_CLIENT_DEBUG(client, "cannot read message: %s\n",
- strerror(errno));
- return -1;
- }
- if (ret == 0) {
- IVSHMEM_CLIENT_DEBUG(client, "lost connection to server\n");
- return -1;
- }
-
- *index = GINT64_FROM_LE(*index);
- *fd = -1;
-
- for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-
- if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)) ||
- cmsg->cmsg_level != SOL_SOCKET ||
- cmsg->cmsg_type != SCM_RIGHTS) {
- continue;
- }
-
- memcpy(fd, CMSG_DATA(cmsg), sizeof(*fd));
- }
-
- return 0;
-}
-
-/* free a peer when the server advertises a disconnection or when the
- * client is freed */
-static void
-ivshmem_client_free_peer(IvshmemClient *client, IvshmemClientPeer *peer)
-{
- unsigned vector;
-
- QTAILQ_REMOVE(&client->peer_list, peer, next);
- for (vector = 0; vector < peer->vectors_count; vector++) {
- close(peer->vectors[vector]);
- }
-
- g_free(peer);
-}
-
-/* handle message coming from server (new peer, new vectors) */
-static int
-ivshmem_client_handle_server_msg(IvshmemClient *client)
-{
- IvshmemClientPeer *peer;
- int64_t peer_id;
- int ret, fd;
-
- ret = ivshmem_client_read_one_msg(client, &peer_id, &fd);
- if (ret < 0) {
- return -1;
- }
-
- /* can return a peer or the local client */
- peer = ivshmem_client_search_peer(client, peer_id);
-
- /* delete peer */
- if (fd == -1) {
-
- if (peer == NULL || peer == &client->local) {
- IVSHMEM_CLIENT_DEBUG(client, "receive delete for invalid "
- "peer %" PRId64 "\n", peer_id);
- return -1;
- }
-
- IVSHMEM_CLIENT_DEBUG(client, "delete peer id = %" PRId64 "\n", peer_id);
- ivshmem_client_free_peer(client, peer);
- return 0;
- }
-
- /* new peer */
- if (peer == NULL) {
- peer = g_malloc0(sizeof(*peer));
- peer->id = peer_id;
- peer->vectors_count = 0;
- QTAILQ_INSERT_TAIL(&client->peer_list, peer, next);
- IVSHMEM_CLIENT_DEBUG(client, "new peer id = %" PRId64 "\n", peer_id);
- }
-
- /* new vector */
- IVSHMEM_CLIENT_DEBUG(client, " new vector %d (fd=%d) for peer id %"
- PRId64 "\n", peer->vectors_count, fd, peer->id);
- if (peer->vectors_count >= G_N_ELEMENTS(peer->vectors)) {
- IVSHMEM_CLIENT_DEBUG(client, "Too many vectors received, failing");
- return -1;
- }
-
- peer->vectors[peer->vectors_count] = fd;
- peer->vectors_count++;
-
- return 0;
-}
-
-/* init a new ivshmem client */
-int
-ivshmem_client_init(IvshmemClient *client, const char *unix_sock_path,
- IvshmemClientNotifCb notif_cb, void *notif_arg,
- bool verbose)
-{
- int ret;
- unsigned i;
-
- memset(client, 0, sizeof(*client));
-
- ret = snprintf(client->unix_sock_path, sizeof(client->unix_sock_path),
- "%s", unix_sock_path);
-
- if (ret < 0 || ret >= sizeof(client->unix_sock_path)) {
- IVSHMEM_CLIENT_DEBUG(client, "could not copy unix socket path\n");
- return -1;
- }
-
- for (i = 0; i < IVSHMEM_CLIENT_MAX_VECTORS; i++) {
- client->local.vectors[i] = -1;
- }
-
- QTAILQ_INIT(&client->peer_list);
- client->local.id = -1;
-
- client->notif_cb = notif_cb;
- client->notif_arg = notif_arg;
- client->verbose = verbose;
- client->shm_fd = -1;
- client->sock_fd = -1;
-
- return 0;
-}
-
-/* create and connect to the unix socket */
-int
-ivshmem_client_connect(IvshmemClient *client)
-{
- struct sockaddr_un sun;
- int fd, ret;
- int64_t tmp;
-
- IVSHMEM_CLIENT_DEBUG(client, "connect to client %s\n",
- client->unix_sock_path);
-
- client->sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
- if (client->sock_fd < 0) {
- IVSHMEM_CLIENT_DEBUG(client, "cannot create socket: %s\n",
- strerror(errno));
- return -1;
- }
-
- sun.sun_family = AF_UNIX;
- ret = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s",
- client->unix_sock_path);
- if (ret < 0 || ret >= sizeof(sun.sun_path)) {
- IVSHMEM_CLIENT_DEBUG(client, "could not copy unix socket path\n");
- goto err_close;
- }
-
- if (connect(client->sock_fd, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
- IVSHMEM_CLIENT_DEBUG(client, "cannot connect to %s: %s\n", sun.sun_path,
- strerror(errno));
- goto err_close;
- }
-
- /* first, we expect a protocol version */
- if (ivshmem_client_read_one_msg(client, &tmp, &fd) < 0 ||
- (tmp != IVSHMEM_PROTOCOL_VERSION) || fd != -1) {
- IVSHMEM_CLIENT_DEBUG(client, "cannot read from server\n");
- goto err_close;
- }
-
- /* then, we expect our index + a fd == -1 */
- if (ivshmem_client_read_one_msg(client, &client->local.id, &fd) < 0 ||
- client->local.id < 0 || fd != -1) {
- IVSHMEM_CLIENT_DEBUG(client, "cannot read from server (2)\n");
- goto err_close;
- }
- IVSHMEM_CLIENT_DEBUG(client, "our_id=%" PRId64 "\n", client->local.id);
-
- /* now, we expect shared mem fd + a -1 index, note that shm fd
- * is not used */
- if (ivshmem_client_read_one_msg(client, &tmp, &fd) < 0 ||
- tmp != -1 || fd < 0) {
- if (fd >= 0) {
- close(fd);
- }
- IVSHMEM_CLIENT_DEBUG(client, "cannot read from server (3)\n");
- goto err_close;
- }
- client->shm_fd = fd;
- IVSHMEM_CLIENT_DEBUG(client, "shm_fd=%d\n", fd);
-
- return 0;
-
-err_close:
- close(client->sock_fd);
- client->sock_fd = -1;
- return -1;
-}
-
-/* close connection to the server, and free all peer structures */
-void
-ivshmem_client_close(IvshmemClient *client)
-{
- IvshmemClientPeer *peer;
- unsigned i;
-
- IVSHMEM_CLIENT_DEBUG(client, "close client\n");
-
- while ((peer = QTAILQ_FIRST(&client->peer_list)) != NULL) {
- ivshmem_client_free_peer(client, peer);
- }
-
- close(client->shm_fd);
- client->shm_fd = -1;
- close(client->sock_fd);
- client->sock_fd = -1;
- client->local.id = -1;
- for (i = 0; i < IVSHMEM_CLIENT_MAX_VECTORS; i++) {
- close(client->local.vectors[i]);
- client->local.vectors[i] = -1;
- }
- client->local.vectors_count = 0;
-}
-
-/* get the fd_set according to the unix socket and peer list */
-void
-ivshmem_client_get_fds(const IvshmemClient *client, fd_set *fds, int *maxfd)
-{
- int fd;
- unsigned vector;
-
- FD_SET(client->sock_fd, fds);
- if (client->sock_fd >= *maxfd) {
- *maxfd = client->sock_fd + 1;
- }
-
- for (vector = 0; vector < client->local.vectors_count; vector++) {
- fd = client->local.vectors[vector];
- FD_SET(fd, fds);
- if (fd >= *maxfd) {
- *maxfd = fd + 1;
- }
- }
-}
-
-/* handle events from eventfd: just print a message on notification */
-static int
-ivshmem_client_handle_event(IvshmemClient *client, const fd_set *cur, int maxfd)
-{
- IvshmemClientPeer *peer;
- uint64_t kick;
- unsigned i;
- int ret;
-
- peer = &client->local;
-
- for (i = 0; i < peer->vectors_count; i++) {
- if (peer->vectors[i] >= maxfd || !FD_ISSET(peer->vectors[i], cur)) {
- continue;
- }
-
- ret = read(peer->vectors[i], &kick, sizeof(kick));
- if (ret < 0) {
- return ret;
- }
- if (ret != sizeof(kick)) {
- IVSHMEM_CLIENT_DEBUG(client, "invalid read size = %d\n", ret);
- errno = EINVAL;
- return -1;
- }
- IVSHMEM_CLIENT_DEBUG(client, "received event on fd %d vector %d: %"
- PRIu64 "\n", peer->vectors[i], i, kick);
- if (client->notif_cb != NULL) {
- client->notif_cb(client, peer, i, client->notif_arg);
- }
- }
-
- return 0;
-}
-
-/* read and handle new messages on the given fd_set */
-int
-ivshmem_client_handle_fds(IvshmemClient *client, fd_set *fds, int maxfd)
-{
- if (client->sock_fd < maxfd && FD_ISSET(client->sock_fd, fds) &&
- ivshmem_client_handle_server_msg(client) < 0 && errno != EINTR) {
- IVSHMEM_CLIENT_DEBUG(client, "ivshmem_client_handle_server_msg() "
- "failed\n");
- return -1;
- } else if (ivshmem_client_handle_event(client, fds, maxfd) < 0 &&
- errno != EINTR) {
- IVSHMEM_CLIENT_DEBUG(client, "ivshmem_client_handle_event() failed\n");
- return -1;
- }
-
- return 0;
-}
-
-/* send a notification on a vector of a peer */
-int
-ivshmem_client_notify(const IvshmemClient *client,
- const IvshmemClientPeer *peer, unsigned vector)
-{
- uint64_t kick;
- int fd;
-
- if (vector >= peer->vectors_count) {
- IVSHMEM_CLIENT_DEBUG(client, "invalid vector %u on peer %" PRId64 "\n",
- vector, peer->id);
- return -1;
- }
- fd = peer->vectors[vector];
- IVSHMEM_CLIENT_DEBUG(client, "notify peer %" PRId64
- " on vector %d, fd %d\n", peer->id, vector, fd);
-
- kick = 1;
- if (write(fd, &kick, sizeof(kick)) != sizeof(kick)) {
- fprintf(stderr, "could not write to %d: %s\n", peer->vectors[vector],
- strerror(errno));
- return -1;
- }
- return 0;
-}
-
-/* send a notification to all vectors of a peer */
-int
-ivshmem_client_notify_all_vects(const IvshmemClient *client,
- const IvshmemClientPeer *peer)
-{
- unsigned vector;
- int ret = 0;
-
- for (vector = 0; vector < peer->vectors_count; vector++) {
- if (ivshmem_client_notify(client, peer, vector) < 0) {
- ret = -1;
- }
- }
-
- return ret;
-}
-
-/* send a notification to all peers */
-int
-ivshmem_client_notify_broadcast(const IvshmemClient *client)
-{
- IvshmemClientPeer *peer;
- int ret = 0;
-
- QTAILQ_FOREACH(peer, &client->peer_list, next) {
- if (ivshmem_client_notify_all_vects(client, peer) < 0) {
- ret = -1;
- }
- }
-
- return ret;
-}
-
-/* lookup peer from its id */
-IvshmemClientPeer *
-ivshmem_client_search_peer(IvshmemClient *client, int64_t peer_id)
-{
- IvshmemClientPeer *peer;
-
- if (peer_id == client->local.id) {
- return &client->local;
- }
-
- QTAILQ_FOREACH(peer, &client->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_client_dump(const IvshmemClient *client)
-{
- const IvshmemClientPeer *peer;
- unsigned vector;
-
- /* dump local infos */
- peer = &client->local;
- printf("our_id = %" PRId64 "\n", peer->id);
- for (vector = 0; vector < peer->vectors_count; vector++) {
- printf(" vector %d is enabled (fd=%d)\n", vector,
- peer->vectors[vector]);
- }
-
- /* dump peers */
- QTAILQ_FOREACH(peer, &client->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,
- peer->vectors[vector]);
- }
- }
-}