mirror of
https://gitlab.com/qemu-project/qemu
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contrib: add ivshmem client and server
When using ivshmem devices, notifications between guests can be sent as interrupts using a ivshmem-server (typical use described in documentation). The client is provided as a debug tool. Signed-off-by: Olivier Matz <olivier.matz@6wind.com> Signed-off-by: David Marchand <david.marchand@6wind.com> [fix a valgrind warning, option and server_close() segvs, extra server headers includes, getopt() return type, out-of-tree build, use qemu event_notifier instead of eventfd, fix x86/osx warnings - Marc-André] Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
parent
12f0b68c82
commit
a75eb03b9f
7
Makefile
7
Makefile
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@ -151,6 +151,8 @@ dummy := $(call unnest-vars,, \
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stub-obj-y \
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util-obj-y \
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qga-obj-y \
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ivshmem-client-obj-y \
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ivshmem-server-obj-y \
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qga-vss-dll-obj-y \
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block-obj-y \
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block-obj-m \
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@ -323,6 +325,11 @@ ifneq ($(EXESUF),)
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qemu-ga: qemu-ga$(EXESUF) $(QGA_VSS_PROVIDER) $(QEMU_GA_MSI)
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endif
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ivshmem-client$(EXESUF): $(ivshmem-client-obj-y)
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$(call LINK, $^)
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ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) libqemuutil.a libqemustub.a
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$(call LINK, $^)
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clean:
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# avoid old build problems by removing potentially incorrect old files
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rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h gen-op-arm.h
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@ -104,3 +104,8 @@ target-obj-y += trace/
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# by libqemuutil.a. These should be moved to a separate .json schema.
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qga-obj-y = qga/
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qga-vss-dll-obj-y = qga/
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######################################################################
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# contrib
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ivshmem-client-obj-y = contrib/ivshmem-client/
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ivshmem-server-obj-y = contrib/ivshmem-server/
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1
configure
vendored
1
configure
vendored
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@ -4508,6 +4508,7 @@ if test "$want_tools" = "yes" ; then
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tools="qemu-img\$(EXESUF) qemu-io\$(EXESUF) $tools"
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if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
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tools="qemu-nbd\$(EXESUF) $tools"
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tools="ivshmem-client\$(EXESUF) ivshmem-server\$(EXESUF) $tools"
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fi
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fi
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if test "$softmmu" = yes ; then
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1
contrib/ivshmem-client/Makefile.objs
Normal file
1
contrib/ivshmem-client/Makefile.objs
Normal file
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@ -0,0 +1 @@
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ivshmem-client-obj-y = ivshmem-client.o main.o
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433
contrib/ivshmem-client/ivshmem-client.c
Normal file
433
contrib/ivshmem-client/ivshmem-client.c
Normal file
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@ -0,0 +1,433 @@
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/*
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* Copyright 6WIND S.A., 2014
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "qemu-common.h"
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#include "qemu/queue.h"
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#include "ivshmem-client.h"
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/* log a message on stdout if verbose=1 */
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#define IVSHMEM_CLIENT_DEBUG(client, fmt, ...) do { \
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if ((client)->verbose) { \
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printf(fmt, ## __VA_ARGS__); \
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} \
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} while (0)
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/* read message from the unix socket */
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static int
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ivshmem_client_read_one_msg(IvshmemClient *client, long *index, int *fd)
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{
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int ret;
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struct msghdr msg;
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struct iovec iov[1];
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union {
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struct cmsghdr cmsg;
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char control[CMSG_SPACE(sizeof(int))];
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} msg_control;
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struct cmsghdr *cmsg;
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iov[0].iov_base = index;
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iov[0].iov_len = sizeof(*index);
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memset(&msg, 0, sizeof(msg));
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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msg.msg_control = &msg_control;
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msg.msg_controllen = sizeof(msg_control);
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ret = recvmsg(client->sock_fd, &msg, 0);
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if (ret < 0) {
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IVSHMEM_CLIENT_DEBUG(client, "cannot read message: %s\n",
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strerror(errno));
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return -1;
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}
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if (ret == 0) {
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IVSHMEM_CLIENT_DEBUG(client, "lost connection to server\n");
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return -1;
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}
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*fd = -1;
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)) ||
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cmsg->cmsg_level != SOL_SOCKET ||
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cmsg->cmsg_type != SCM_RIGHTS) {
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continue;
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}
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memcpy(fd, CMSG_DATA(cmsg), sizeof(*fd));
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}
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return 0;
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}
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/* free a peer when the server advertises a disconnection or when the
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* client is freed */
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static void
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ivshmem_client_free_peer(IvshmemClient *client, IvshmemClientPeer *peer)
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{
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unsigned vector;
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QTAILQ_REMOVE(&client->peer_list, peer, next);
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for (vector = 0; vector < peer->vectors_count; vector++) {
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close(peer->vectors[vector]);
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}
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g_free(peer);
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}
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/* handle message coming from server (new peer, new vectors) */
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static int
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ivshmem_client_handle_server_msg(IvshmemClient *client)
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{
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IvshmemClientPeer *peer;
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long peer_id;
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int ret, fd;
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ret = ivshmem_client_read_one_msg(client, &peer_id, &fd);
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if (ret < 0) {
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return -1;
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}
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/* can return a peer or the local client */
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peer = ivshmem_client_search_peer(client, peer_id);
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/* delete peer */
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if (fd == -1) {
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if (peer == NULL || peer == &client->local) {
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IVSHMEM_CLIENT_DEBUG(client, "receive delete for invalid "
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"peer %ld\n", peer_id);
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return -1;
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}
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IVSHMEM_CLIENT_DEBUG(client, "delete peer id = %ld\n", peer_id);
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ivshmem_client_free_peer(client, peer);
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return 0;
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}
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/* new peer */
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if (peer == NULL) {
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peer = g_malloc0(sizeof(*peer));
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peer->id = peer_id;
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peer->vectors_count = 0;
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QTAILQ_INSERT_TAIL(&client->peer_list, peer, next);
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IVSHMEM_CLIENT_DEBUG(client, "new peer id = %ld\n", peer_id);
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}
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/* new vector */
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IVSHMEM_CLIENT_DEBUG(client, " new vector %d (fd=%d) for peer id %ld\n",
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peer->vectors_count, fd, peer->id);
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peer->vectors[peer->vectors_count] = fd;
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peer->vectors_count++;
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return 0;
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}
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/* init a new ivshmem client */
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int
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ivshmem_client_init(IvshmemClient *client, const char *unix_sock_path,
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IvshmemClientNotifCb notif_cb, void *notif_arg,
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bool verbose)
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{
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int ret;
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unsigned i;
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memset(client, 0, sizeof(*client));
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ret = snprintf(client->unix_sock_path, sizeof(client->unix_sock_path),
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"%s", unix_sock_path);
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if (ret < 0 || ret >= sizeof(client->unix_sock_path)) {
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IVSHMEM_CLIENT_DEBUG(client, "could not copy unix socket path\n");
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return -1;
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}
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for (i = 0; i < IVSHMEM_CLIENT_MAX_VECTORS; i++) {
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client->local.vectors[i] = -1;
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}
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QTAILQ_INIT(&client->peer_list);
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client->local.id = -1;
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client->notif_cb = notif_cb;
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client->notif_arg = notif_arg;
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client->verbose = verbose;
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client->shm_fd = -1;
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client->sock_fd = -1;
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return 0;
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}
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/* create and connect to the unix socket */
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int
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ivshmem_client_connect(IvshmemClient *client)
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{
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struct sockaddr_un sun;
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int fd, ret;
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long tmp;
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IVSHMEM_CLIENT_DEBUG(client, "connect to client %s\n",
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client->unix_sock_path);
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client->sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (client->sock_fd < 0) {
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IVSHMEM_CLIENT_DEBUG(client, "cannot create socket: %s\n",
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strerror(errno));
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return -1;
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}
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sun.sun_family = AF_UNIX;
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ret = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s",
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client->unix_sock_path);
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if (ret < 0 || ret >= sizeof(sun.sun_path)) {
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IVSHMEM_CLIENT_DEBUG(client, "could not copy unix socket path\n");
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goto err_close;
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}
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if (connect(client->sock_fd, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
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IVSHMEM_CLIENT_DEBUG(client, "cannot connect to %s: %s\n", sun.sun_path,
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strerror(errno));
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goto err_close;
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}
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/* first, we expect our index + a fd == -1 */
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if (ivshmem_client_read_one_msg(client, &client->local.id, &fd) < 0 ||
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client->local.id < 0 || fd != -1) {
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IVSHMEM_CLIENT_DEBUG(client, "cannot read from server\n");
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goto err_close;
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}
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IVSHMEM_CLIENT_DEBUG(client, "our_id=%ld\n", client->local.id);
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/* now, we expect shared mem fd + a -1 index, note that shm fd
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* is not used */
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if (ivshmem_client_read_one_msg(client, &tmp, &fd) < 0 ||
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tmp != -1 || fd < 0) {
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if (fd >= 0) {
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close(fd);
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}
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IVSHMEM_CLIENT_DEBUG(client, "cannot read from server (2)\n");
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goto err_close;
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}
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client->shm_fd = fd;
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IVSHMEM_CLIENT_DEBUG(client, "shm_fd=%d\n", fd);
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return 0;
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err_close:
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close(client->sock_fd);
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client->sock_fd = -1;
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return -1;
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}
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/* close connection to the server, and free all peer structures */
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void
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ivshmem_client_close(IvshmemClient *client)
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{
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IvshmemClientPeer *peer;
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unsigned i;
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IVSHMEM_CLIENT_DEBUG(client, "close client\n");
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while ((peer = QTAILQ_FIRST(&client->peer_list)) != NULL) {
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ivshmem_client_free_peer(client, peer);
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}
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close(client->shm_fd);
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client->shm_fd = -1;
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close(client->sock_fd);
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client->sock_fd = -1;
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client->local.id = -1;
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for (i = 0; i < IVSHMEM_CLIENT_MAX_VECTORS; i++) {
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close(client->local.vectors[i]);
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client->local.vectors[i] = -1;
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}
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client->local.vectors_count = 0;
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}
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/* get the fd_set according to the unix socket and peer list */
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void
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ivshmem_client_get_fds(const IvshmemClient *client, fd_set *fds, int *maxfd)
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{
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int fd;
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unsigned vector;
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FD_SET(client->sock_fd, fds);
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if (client->sock_fd >= *maxfd) {
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*maxfd = client->sock_fd + 1;
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}
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for (vector = 0; vector < client->local.vectors_count; vector++) {
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fd = client->local.vectors[vector];
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FD_SET(fd, fds);
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if (fd >= *maxfd) {
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*maxfd = fd + 1;
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}
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}
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}
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/* handle events from eventfd: just print a message on notification */
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static int
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ivshmem_client_handle_event(IvshmemClient *client, const fd_set *cur, int maxfd)
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{
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IvshmemClientPeer *peer;
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uint64_t kick;
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unsigned i;
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int ret;
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peer = &client->local;
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for (i = 0; i < peer->vectors_count; i++) {
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if (peer->vectors[i] >= maxfd || !FD_ISSET(peer->vectors[i], cur)) {
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continue;
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}
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ret = read(peer->vectors[i], &kick, sizeof(kick));
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if (ret < 0) {
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return ret;
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}
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if (ret != sizeof(kick)) {
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IVSHMEM_CLIENT_DEBUG(client, "invalid read size = %d\n", ret);
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errno = EINVAL;
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return -1;
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}
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IVSHMEM_CLIENT_DEBUG(client, "received event on fd %d vector %d: %"
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PRIu64 "\n", peer->vectors[i], i, kick);
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if (client->notif_cb != NULL) {
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client->notif_cb(client, peer, i, client->notif_arg);
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}
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}
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return 0;
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}
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/* read and handle new messages on the given fd_set */
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int
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ivshmem_client_handle_fds(IvshmemClient *client, fd_set *fds, int maxfd)
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{
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if (client->sock_fd < maxfd && FD_ISSET(client->sock_fd, fds) &&
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ivshmem_client_handle_server_msg(client) < 0 && errno != EINTR) {
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IVSHMEM_CLIENT_DEBUG(client, "ivshmem_client_handle_server_msg() "
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"failed\n");
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return -1;
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} else if (ivshmem_client_handle_event(client, fds, maxfd) < 0 &&
|
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errno != EINTR) {
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IVSHMEM_CLIENT_DEBUG(client, "ivshmem_client_handle_event() failed\n");
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return -1;
|
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}
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return 0;
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}
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/* send a notification on a vector of a peer */
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int
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ivshmem_client_notify(const IvshmemClient *client,
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const IvshmemClientPeer *peer, unsigned vector)
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{
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uint64_t kick;
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int fd;
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|
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if (vector >= peer->vectors_count) {
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IVSHMEM_CLIENT_DEBUG(client, "invalid vector %u on peer %ld\n",
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vector, peer->id);
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return -1;
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}
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fd = peer->vectors[vector];
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IVSHMEM_CLIENT_DEBUG(client, "notify peer %ld on vector %d, fd %d\n",
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peer->id, vector, fd);
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|
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kick = 1;
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if (write(fd, &kick, sizeof(kick)) != sizeof(kick)) {
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fprintf(stderr, "could not write to %d: %s\n", peer->vectors[vector],
|
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strerror(errno));
|
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return -1;
|
||||
}
|
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return 0;
|
||||
}
|
||||
|
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/* send a notification to all vectors of a peer */
|
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int
|
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ivshmem_client_notify_all_vects(const IvshmemClient *client,
|
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const IvshmemClientPeer *peer)
|
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{
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unsigned vector;
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int ret = 0;
|
||||
|
||||
for (vector = 0; vector < peer->vectors_count; vector++) {
|
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if (ivshmem_client_notify(client, peer, vector) < 0) {
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ret = -1;
|
||||
}
|
||||
}
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||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* send a notification to all peers */
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int
|
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ivshmem_client_notify_broadcast(const IvshmemClient *client)
|
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{
|
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IvshmemClientPeer *peer;
|
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int ret = 0;
|
||||
|
||||
QTAILQ_FOREACH(peer, &client->peer_list, next) {
|
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if (ivshmem_client_notify_all_vects(client, peer) < 0) {
|
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ret = -1;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* lookup peer from its id */
|
||||
IvshmemClientPeer *
|
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ivshmem_client_search_peer(IvshmemClient *client, long peer_id)
|
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{
|
||||
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 = %ld\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 = %ld\n", peer->id);
|
||||
|
||||
for (vector = 0; vector < peer->vectors_count; vector++) {
|
||||
printf(" vector %d is enabled (fd=%d)\n", vector,
|
||||
peer->vectors[vector]);
|
||||
}
|
||||
}
|
||||
}
|
212
contrib/ivshmem-client/ivshmem-client.h
Normal file
212
contrib/ivshmem-client/ivshmem-client.h
Normal file
|
@ -0,0 +1,212 @@
|
|||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef _IVSHMEM_CLIENT_H_
|
||||
#define _IVSHMEM_CLIENT_H_
|
||||
|
||||
/**
|
||||
* This file provides helper to implement an ivshmem client. It is used
|
||||
* on the host to ask QEMU to send an interrupt to an ivshmem PCI device in a
|
||||
* guest. QEMU also implements an ivshmem client similar to this one, they both
|
||||
* connect to an ivshmem server.
|
||||
*
|
||||
* A standalone ivshmem client based on this file is provided for debug/test
|
||||
* purposes.
|
||||
*/
|
||||
|
||||
#include <limits.h>
|
||||
#include <sys/select.h>
|
||||
|
||||
#include "qemu/queue.h"
|
||||
|
||||
/**
|
||||
* Maximum number of notification vectors supported by the client
|
||||
*/
|
||||
#define IVSHMEM_CLIENT_MAX_VECTORS 64
|
||||
|
||||
/**
|
||||
* Structure storing a peer
|
||||
*
|
||||
* Each time a client connects to an ivshmem server, it is advertised to
|
||||
* all connected clients through the unix socket. When our ivshmem
|
||||
* client receives a notification, it creates a IvshmemClientPeer
|
||||
* structure to store the infos of this peer.
|
||||
*
|
||||
* This structure is also used to store the information of our own
|
||||
* client in (IvshmemClient)->local.
|
||||
*/
|
||||
typedef struct IvshmemClientPeer {
|
||||
QTAILQ_ENTRY(IvshmemClientPeer) next; /**< next in list*/
|
||||
long id; /**< the id of the peer */
|
||||
int vectors[IVSHMEM_CLIENT_MAX_VECTORS]; /**< one fd per vector */
|
||||
unsigned vectors_count; /**< number of vectors */
|
||||
} IvshmemClientPeer;
|
||||
QTAILQ_HEAD(IvshmemClientPeerList, IvshmemClientPeer);
|
||||
|
||||
typedef struct IvshmemClientPeerList IvshmemClientPeerList;
|
||||
typedef struct IvshmemClient IvshmemClient;
|
||||
|
||||
/**
|
||||
* Typedef of callback function used when our IvshmemClient receives a
|
||||
* notification from a peer.
|
||||
*/
|
||||
typedef void (*IvshmemClientNotifCb)(
|
||||
const IvshmemClient *client,
|
||||
const IvshmemClientPeer *peer,
|
||||
unsigned vect, void *arg);
|
||||
|
||||
/**
|
||||
* Structure describing an ivshmem client
|
||||
*
|
||||
* This structure stores all information related to our client: the name
|
||||
* of the server unix socket, the list of peers advertised by the
|
||||
* server, our own client information, and a pointer the notification
|
||||
* callback function used when we receive a notification from a peer.
|
||||
*/
|
||||
struct IvshmemClient {
|
||||
char unix_sock_path[PATH_MAX]; /**< path to unix sock */
|
||||
int sock_fd; /**< unix sock filedesc */
|
||||
int shm_fd; /**< shm file descriptor */
|
||||
|
||||
IvshmemClientPeerList peer_list; /**< list of peers */
|
||||
IvshmemClientPeer local; /**< our own infos */
|
||||
|
||||
IvshmemClientNotifCb notif_cb; /**< notification callback */
|
||||
void *notif_arg; /**< notification argument */
|
||||
|
||||
bool verbose; /**< true to enable debug */
|
||||
};
|
||||
|
||||
/**
|
||||
* Initialize an ivshmem client
|
||||
*
|
||||
* @client: A pointer to an uninitialized IvshmemClient structure
|
||||
* @unix_sock_path: The pointer to the unix socket file name
|
||||
* @notif_cb: If not NULL, the pointer to the function to be called when
|
||||
* our IvshmemClient receives a notification from a peer
|
||||
* @notif_arg: Opaque pointer given as-is to the notification callback
|
||||
* function
|
||||
* @verbose: True to enable debug
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error
|
||||
*/
|
||||
int ivshmem_client_init(IvshmemClient *client, const char *unix_sock_path,
|
||||
IvshmemClientNotifCb notif_cb, void *notif_arg,
|
||||
bool verbose);
|
||||
|
||||
/**
|
||||
* Connect to the server
|
||||
*
|
||||
* Connect to the server unix socket, and read the first initial
|
||||
* messages sent by the server, giving the ID of the client and the file
|
||||
* descriptor of the shared memory.
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error
|
||||
*/
|
||||
int ivshmem_client_connect(IvshmemClient *client);
|
||||
|
||||
/**
|
||||
* Close connection to the server and free all peer structures
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
*/
|
||||
void ivshmem_client_close(IvshmemClient *client);
|
||||
|
||||
/**
|
||||
* Fill a fd_set with file descriptors to be monitored
|
||||
*
|
||||
* This function will fill a fd_set with all file descriptors
|
||||
* that must be polled (unix server socket and peers eventfd). The
|
||||
* function will not initialize the fd_set, it is up to the caller
|
||||
* to do this.
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
* @fds: The fd_set to be updated
|
||||
* @maxfd: Must be set to the max file descriptor + 1 in fd_set. This value is
|
||||
* updated if this function adds a greater fd in fd_set.
|
||||
*/
|
||||
void ivshmem_client_get_fds(const IvshmemClient *client, fd_set *fds,
|
||||
int *maxfd);
|
||||
|
||||
/**
|
||||
* Read and handle new messages
|
||||
*
|
||||
* Given a fd_set filled by select(), handle incoming messages from
|
||||
* server or peers.
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
* @fds: The fd_set containing the file descriptors to be checked. Note
|
||||
* that file descriptors that are not related to our client are
|
||||
* ignored.
|
||||
* @maxfd: The maximum fd in fd_set, plus one.
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error
|
||||
*/
|
||||
int ivshmem_client_handle_fds(IvshmemClient *client, fd_set *fds, int maxfd);
|
||||
|
||||
/**
|
||||
* Send a notification to a vector of a peer
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
* @peer: The peer to be notified
|
||||
* @vector: The number of the vector
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error
|
||||
*/
|
||||
int ivshmem_client_notify(const IvshmemClient *client,
|
||||
const IvshmemClientPeer *peer, unsigned vector);
|
||||
|
||||
/**
|
||||
* Send a notification to all vectors of a peer
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
* @peer: The peer to be notified
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error (at least one
|
||||
* notification failed)
|
||||
*/
|
||||
int ivshmem_client_notify_all_vects(const IvshmemClient *client,
|
||||
const IvshmemClientPeer *peer);
|
||||
|
||||
/**
|
||||
* Broadcat a notification to all vectors of all peers
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error (at least one
|
||||
* notification failed)
|
||||
*/
|
||||
int ivshmem_client_notify_broadcast(const IvshmemClient *client);
|
||||
|
||||
/**
|
||||
* Search a peer from its identifier
|
||||
*
|
||||
* Return the peer structure from its peer_id. If the given peer_id is
|
||||
* the local id, the function returns the local peer structure.
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
* @peer_id: The identifier of the peer structure
|
||||
*
|
||||
* Returns: The peer structure, or NULL if not found
|
||||
*/
|
||||
IvshmemClientPeer *
|
||||
ivshmem_client_search_peer(IvshmemClient *client, long peer_id);
|
||||
|
||||
/**
|
||||
* Dump information of this ivshmem client on stdout
|
||||
*
|
||||
* Dump the id and the vectors of the given ivshmem client and the list
|
||||
* of its peers and their vectors on stdout.
|
||||
*
|
||||
* @client: The ivshmem client
|
||||
*/
|
||||
void ivshmem_client_dump(const IvshmemClient *client);
|
||||
|
||||
#endif /* _IVSHMEM_CLIENT_H_ */
|
239
contrib/ivshmem-client/main.c
Normal file
239
contrib/ivshmem-client/main.c
Normal file
|
@ -0,0 +1,239 @@
|
|||
/*
|
||||
* 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-common.h"
|
||||
|
||||
#include "ivshmem-client.h"
|
||||
|
||||
#define IVSHMEM_CLIENT_DEFAULT_VERBOSE 0
|
||||
#define IVSHMEM_CLIENT_DEFAULT_UNIX_SOCK_PATH "/tmp/ivshmem_socket"
|
||||
|
||||
typedef struct IvshmemClientArgs {
|
||||
bool verbose;
|
||||
const char *unix_sock_path;
|
||||
} IvshmemClientArgs;
|
||||
|
||||
/* show ivshmem_client_usage and exit with given error code */
|
||||
static void
|
||||
ivshmem_client_usage(const char *name, int code)
|
||||
{
|
||||
fprintf(stderr, "%s [opts]\n", name);
|
||||
fprintf(stderr, " -h: show this help\n");
|
||||
fprintf(stderr, " -v: verbose mode\n");
|
||||
fprintf(stderr, " -S <unix_sock_path>: path to the unix socket\n"
|
||||
" to connect to.\n"
|
||||
" default=%s\n", IVSHMEM_CLIENT_DEFAULT_UNIX_SOCK_PATH);
|
||||
exit(code);
|
||||
}
|
||||
|
||||
/* parse the program arguments, exit on error */
|
||||
static void
|
||||
ivshmem_client_parse_args(IvshmemClientArgs *args, int argc, char *argv[])
|
||||
{
|
||||
int c;
|
||||
|
||||
while ((c = getopt(argc, argv,
|
||||
"h" /* help */
|
||||
"v" /* verbose */
|
||||
"S:" /* unix_sock_path */
|
||||
)) != -1) {
|
||||
|
||||
switch (c) {
|
||||
case 'h': /* help */
|
||||
ivshmem_client_usage(argv[0], 0);
|
||||
break;
|
||||
|
||||
case 'v': /* verbose */
|
||||
args->verbose = 1;
|
||||
break;
|
||||
|
||||
case 'S': /* unix_sock_path */
|
||||
args->unix_sock_path = strdup(optarg);
|
||||
break;
|
||||
|
||||
default:
|
||||
ivshmem_client_usage(argv[0], 1);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* show command line help */
|
||||
static void
|
||||
ivshmem_client_cmdline_help(void)
|
||||
{
|
||||
printf("dump: dump peers (including us)\n"
|
||||
"int <peer> <vector>: notify one vector on a peer\n"
|
||||
"int <peer> all: notify all vectors of a peer\n"
|
||||
"int all: notify all vectors of all peers (excepting us)\n");
|
||||
}
|
||||
|
||||
/* read stdin and handle commands */
|
||||
static int
|
||||
ivshmem_client_handle_stdin_command(IvshmemClient *client)
|
||||
{
|
||||
IvshmemClientPeer *peer;
|
||||
char buf[128];
|
||||
char *s, *token;
|
||||
int ret;
|
||||
int peer_id, vector;
|
||||
|
||||
memset(buf, 0, sizeof(buf));
|
||||
ret = read(0, buf, sizeof(buf) - 1);
|
||||
if (ret < 0) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
s = buf;
|
||||
while ((token = strsep(&s, "\n\r;")) != NULL) {
|
||||
if (!strcmp(token, "")) {
|
||||
continue;
|
||||
}
|
||||
if (!strcmp(token, "?")) {
|
||||
ivshmem_client_cmdline_help();
|
||||
}
|
||||
if (!strcmp(token, "help")) {
|
||||
ivshmem_client_cmdline_help();
|
||||
} else if (!strcmp(token, "dump")) {
|
||||
ivshmem_client_dump(client);
|
||||
} else if (!strcmp(token, "int all")) {
|
||||
ivshmem_client_notify_broadcast(client);
|
||||
} else if (sscanf(token, "int %d %d", &peer_id, &vector) == 2) {
|
||||
peer = ivshmem_client_search_peer(client, peer_id);
|
||||
if (peer == NULL) {
|
||||
printf("cannot find peer_id = %d\n", peer_id);
|
||||
continue;
|
||||
}
|
||||
ivshmem_client_notify(client, peer, vector);
|
||||
} else if (sscanf(token, "int %d all", &peer_id) == 1) {
|
||||
peer = ivshmem_client_search_peer(client, peer_id);
|
||||
if (peer == NULL) {
|
||||
printf("cannot find peer_id = %d\n", peer_id);
|
||||
continue;
|
||||
}
|
||||
ivshmem_client_notify_all_vects(client, peer);
|
||||
} else {
|
||||
printf("invalid command, type help\n");
|
||||
}
|
||||
}
|
||||
|
||||
printf("cmd> ");
|
||||
fflush(stdout);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* listen on stdin (command line), on unix socket (notifications of new
|
||||
* and dead peers), and on eventfd (IRQ request) */
|
||||
static int
|
||||
ivshmem_client_poll_events(IvshmemClient *client)
|
||||
{
|
||||
fd_set fds;
|
||||
int ret, maxfd;
|
||||
|
||||
while (1) {
|
||||
|
||||
FD_ZERO(&fds);
|
||||
FD_SET(0, &fds); /* add stdin in fd_set */
|
||||
maxfd = 1;
|
||||
|
||||
ivshmem_client_get_fds(client, &fds, &maxfd);
|
||||
|
||||
ret = select(maxfd, &fds, NULL, NULL, NULL);
|
||||
if (ret < 0) {
|
||||
if (errno == EINTR) {
|
||||
continue;
|
||||
}
|
||||
|
||||
fprintf(stderr, "select error: %s\n", strerror(errno));
|
||||
break;
|
||||
}
|
||||
if (ret == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (FD_ISSET(0, &fds) &&
|
||||
ivshmem_client_handle_stdin_command(client) < 0 && errno != EINTR) {
|
||||
fprintf(stderr, "ivshmem_client_handle_stdin_command() failed\n");
|
||||
break;
|
||||
}
|
||||
|
||||
if (ivshmem_client_handle_fds(client, &fds, maxfd) < 0) {
|
||||
fprintf(stderr, "ivshmem_client_handle_fds() failed\n");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* callback when we receive a notification (just display it) */
|
||||
static void
|
||||
ivshmem_client_notification_cb(const IvshmemClient *client,
|
||||
const IvshmemClientPeer *peer,
|
||||
unsigned vect, void *arg)
|
||||
{
|
||||
(void)client;
|
||||
(void)arg;
|
||||
printf("receive notification from peer_id=%ld vector=%d\n", peer->id, vect);
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
struct sigaction sa;
|
||||
IvshmemClient client;
|
||||
IvshmemClientArgs args = {
|
||||
.verbose = IVSHMEM_CLIENT_DEFAULT_VERBOSE,
|
||||
.unix_sock_path = IVSHMEM_CLIENT_DEFAULT_UNIX_SOCK_PATH,
|
||||
};
|
||||
|
||||
/* parse arguments, will exit on error */
|
||||
ivshmem_client_parse_args(&args, argc, argv);
|
||||
|
||||
/* Ignore SIGPIPE, see this link for more info:
|
||||
* http://www.mail-archive.com/libevent-users@monkey.org/msg01606.html */
|
||||
sa.sa_handler = SIG_IGN;
|
||||
sa.sa_flags = 0;
|
||||
if (sigemptyset(&sa.sa_mask) == -1 ||
|
||||
sigaction(SIGPIPE, &sa, 0) == -1) {
|
||||
perror("failed to ignore SIGPIPE; sigaction");
|
||||
return 1;
|
||||
}
|
||||
|
||||
ivshmem_client_cmdline_help();
|
||||
printf("cmd> ");
|
||||
fflush(stdout);
|
||||
|
||||
if (ivshmem_client_init(&client, args.unix_sock_path,
|
||||
ivshmem_client_notification_cb, NULL,
|
||||
args.verbose) < 0) {
|
||||
fprintf(stderr, "cannot init client\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
while (1) {
|
||||
if (ivshmem_client_connect(&client) < 0) {
|
||||
fprintf(stderr, "cannot connect to server, retry in 1 second\n");
|
||||
sleep(1);
|
||||
continue;
|
||||
}
|
||||
|
||||
fprintf(stdout, "listen on server socket %d\n", client.sock_fd);
|
||||
|
||||
if (ivshmem_client_poll_events(&client) == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
/* disconnected from server, reset all peers */
|
||||
fprintf(stdout, "disconnected from server\n");
|
||||
|
||||
ivshmem_client_close(&client);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
1
contrib/ivshmem-server/Makefile.objs
Normal file
1
contrib/ivshmem-server/Makefile.objs
Normal file
|
@ -0,0 +1 @@
|
|||
ivshmem-server-obj-y = ivshmem-server.o main.o
|
422
contrib/ivshmem-server/ivshmem-server.c
Normal file
422
contrib/ivshmem-server/ivshmem-server.c
Normal file
|
@ -0,0 +1,422 @@
|
|||
/*
|
||||
* 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-common.h"
|
||||
#include "qemu/sockets.h"
|
||||
|
||||
#include <sys/mman.h>
|
||||
#include <sys/types.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, long 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;
|
||||
|
||||
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 %ld\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 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 */
|
||||
while (ivshmem_server_search_peer(server, server->cur_id) != NULL) {
|
||||
server->cur_id++;
|
||||
}
|
||||
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 = %ld\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, 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->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 */
|
||||
shm_fd = shm_open(server->shm_path, O_CREAT|O_RDWR, S_IRWXU);
|
||||
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, long 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 = %ld\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]));
|
||||
}
|
||||
}
|
||||
}
|
167
contrib/ivshmem-server/ivshmem-server.h
Normal file
167
contrib/ivshmem-server/ivshmem-server.h
Normal file
|
@ -0,0 +1,167 @@
|
|||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef _IVSHMEM_SERVER_H_
|
||||
#define _IVSHMEM_SERVER_H_
|
||||
|
||||
/**
|
||||
* The ivshmem server is a daemon that creates a unix socket in listen
|
||||
* mode. The ivshmem clients (qemu or ivshmem-client) connect to this
|
||||
* unix socket. For each client, the server will create some eventfd
|
||||
* (see EVENTFD(2)), one per vector. These fd are transmitted to all
|
||||
* clients using the SCM_RIGHTS cmsg message. Therefore, each client is
|
||||
* able to send a notification to another client without beeing
|
||||
* "profixied" by the server.
|
||||
*
|
||||
* We use this mechanism to send interruptions between guests.
|
||||
* qemu is able to transform an event on a eventfd into a PCI MSI-x
|
||||
* interruption in the guest.
|
||||
*
|
||||
* The ivshmem server is also able to share the file descriptor
|
||||
* associated to the ivshmem shared memory.
|
||||
*/
|
||||
|
||||
#include <limits.h>
|
||||
#include <sys/select.h>
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
#include "qemu/event_notifier.h"
|
||||
#include "qemu/queue.h"
|
||||
|
||||
/**
|
||||
* Maximum number of notification vectors supported by the server
|
||||
*/
|
||||
#define IVSHMEM_SERVER_MAX_VECTORS 64
|
||||
|
||||
/**
|
||||
* Structure storing a peer
|
||||
*
|
||||
* Each time a client connects to an ivshmem server, a new
|
||||
* IvshmemServerPeer structure is created. This peer and all its
|
||||
* vectors are advertised to all connected clients through the connected
|
||||
* unix sockets.
|
||||
*/
|
||||
typedef struct IvshmemServerPeer {
|
||||
QTAILQ_ENTRY(IvshmemServerPeer) next; /**< next in list*/
|
||||
int sock_fd; /**< connected unix sock */
|
||||
long id; /**< the id of the peer */
|
||||
EventNotifier vectors[IVSHMEM_SERVER_MAX_VECTORS]; /**< one per vector */
|
||||
unsigned vectors_count; /**< number of vectors */
|
||||
} IvshmemServerPeer;
|
||||
QTAILQ_HEAD(IvshmemServerPeerList, IvshmemServerPeer);
|
||||
|
||||
typedef struct IvshmemServerPeerList IvshmemServerPeerList;
|
||||
|
||||
/**
|
||||
* Structure describing an ivshmem server
|
||||
*
|
||||
* This structure stores all information related to our server: the name
|
||||
* of the server unix socket and the list of connected peers.
|
||||
*/
|
||||
typedef struct IvshmemServer {
|
||||
char unix_sock_path[PATH_MAX]; /**< path to unix socket */
|
||||
int sock_fd; /**< unix sock file descriptor */
|
||||
char shm_path[PATH_MAX]; /**< path to shm */
|
||||
size_t shm_size; /**< size of shm */
|
||||
int shm_fd; /**< shm file descriptor */
|
||||
unsigned n_vectors; /**< number of vectors */
|
||||
long cur_id; /**< id to be given to next client */
|
||||
bool verbose; /**< true in verbose mode */
|
||||
IvshmemServerPeerList peer_list; /**< list of peers */
|
||||
} IvshmemServer;
|
||||
|
||||
/**
|
||||
* Initialize an ivshmem server
|
||||
*
|
||||
* @server: A pointer to an uninitialized IvshmemServer structure
|
||||
* @unix_sock_path: The pointer to the unix socket file name
|
||||
* @shm_path: Path to the shared memory. The path corresponds to a POSIX
|
||||
* shm name. To use a real file, for instance in a hugetlbfs,
|
||||
* it is possible to use /../../abspath/to/file.
|
||||
* @shm_size: Size of shared memory
|
||||
* @n_vectors: Number of interrupt vectors per client
|
||||
* @verbose: True to enable verbose mode
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error
|
||||
*/
|
||||
int
|
||||
ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path,
|
||||
const char *shm_path, size_t shm_size, unsigned n_vectors,
|
||||
bool verbose);
|
||||
|
||||
/**
|
||||
* Open the shm, then create and bind to the unix socket
|
||||
*
|
||||
* @server: The pointer to the initialized IvshmemServer structure
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error
|
||||
*/
|
||||
int ivshmem_server_start(IvshmemServer *server);
|
||||
|
||||
/**
|
||||
* Close the server
|
||||
*
|
||||
* Close connections to all clients, close the unix socket and the
|
||||
* shared memory file descriptor. The structure remains initialized, so
|
||||
* it is possible to call ivshmem_server_start() again after a call to
|
||||
* ivshmem_server_close().
|
||||
*
|
||||
* @server: The ivshmem server
|
||||
*/
|
||||
void ivshmem_server_close(IvshmemServer *server);
|
||||
|
||||
/**
|
||||
* Fill a fd_set with file descriptors to be monitored
|
||||
*
|
||||
* This function will fill a fd_set with all file descriptors that must
|
||||
* be polled (unix server socket and peers unix socket). The function
|
||||
* will not initialize the fd_set, it is up to the caller to do it.
|
||||
*
|
||||
* @server: The ivshmem server
|
||||
* @fds: The fd_set to be updated
|
||||
* @maxfd: Must be set to the max file descriptor + 1 in fd_set. This value is
|
||||
* updated if this function adds a greater fd in fd_set.
|
||||
*/
|
||||
void
|
||||
ivshmem_server_get_fds(const IvshmemServer *server, fd_set *fds, int *maxfd);
|
||||
|
||||
/**
|
||||
* Read and handle new messages
|
||||
*
|
||||
* Given a fd_set (for instance filled by a call to select()), handle
|
||||
* incoming messages from peers.
|
||||
*
|
||||
* @server: The ivshmem server
|
||||
* @fds: The fd_set containing the file descriptors to be checked. Note that
|
||||
* file descriptors that are not related to our server are ignored.
|
||||
* @maxfd: The maximum fd in fd_set, plus one.
|
||||
*
|
||||
* Returns: 0 on success, or a negative value on error
|
||||
*/
|
||||
int ivshmem_server_handle_fds(IvshmemServer *server, fd_set *fds, int maxfd);
|
||||
|
||||
/**
|
||||
* Search a peer from its identifier
|
||||
*
|
||||
* @server: The ivshmem server
|
||||
* @peer_id: The identifier of the peer structure
|
||||
*
|
||||
* Returns: The peer structure, or NULL if not found
|
||||
*/
|
||||
IvshmemServerPeer *
|
||||
ivshmem_server_search_peer(IvshmemServer *server, long peer_id);
|
||||
|
||||
/**
|
||||
* Dump information of this ivshmem server and its peers on stdout
|
||||
*
|
||||
* @server: The ivshmem server
|
||||
*/
|
||||
void ivshmem_server_dump(const IvshmemServer *server);
|
||||
|
||||
#endif /* _IVSHMEM_SERVER_H_ */
|
264
contrib/ivshmem-server/main.c
Normal file
264
contrib/ivshmem-server/main.c
Normal file
|
@ -0,0 +1,264 @@
|
|||
/*
|
||||
* 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-common.h"
|
||||
|
||||
#include "ivshmem-server.h"
|
||||
|
||||
#define IVSHMEM_SERVER_DEFAULT_VERBOSE 0
|
||||
#define IVSHMEM_SERVER_DEFAULT_FOREGROUND 0
|
||||
#define IVSHMEM_SERVER_DEFAULT_PID_FILE "/var/run/ivshmem-server.pid"
|
||||
#define IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "/tmp/ivshmem_socket"
|
||||
#define IVSHMEM_SERVER_DEFAULT_SHM_PATH "ivshmem"
|
||||
#define IVSHMEM_SERVER_DEFAULT_SHM_SIZE (4*1024*1024)
|
||||
#define IVSHMEM_SERVER_DEFAULT_N_VECTORS 1
|
||||
|
||||
/* used to quit on signal SIGTERM */
|
||||
static int ivshmem_server_quit;
|
||||
|
||||
/* arguments given by the user */
|
||||
typedef struct IvshmemServerArgs {
|
||||
bool verbose;
|
||||
bool foreground;
|
||||
const char *pid_file;
|
||||
const char *unix_socket_path;
|
||||
const char *shm_path;
|
||||
uint64_t shm_size;
|
||||
unsigned n_vectors;
|
||||
} IvshmemServerArgs;
|
||||
|
||||
/* show ivshmem_server_usage and exit with given error code */
|
||||
static void
|
||||
ivshmem_server_usage(const char *name, int code)
|
||||
{
|
||||
fprintf(stderr, "%s [opts]\n", name);
|
||||
fprintf(stderr, " -h: show this help\n");
|
||||
fprintf(stderr, " -v: verbose mode\n");
|
||||
fprintf(stderr, " -F: foreground mode (default is to daemonize)\n");
|
||||
fprintf(stderr, " -p <pid_file>: path to the PID file (used in daemon\n"
|
||||
" mode only).\n"
|
||||
" Default=%s\n", IVSHMEM_SERVER_DEFAULT_SHM_PATH);
|
||||
fprintf(stderr, " -S <unix_socket_path>: path to the unix socket\n"
|
||||
" to listen to.\n"
|
||||
" Default=%s\n", IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH);
|
||||
fprintf(stderr, " -m <shm_path>: path to the shared memory.\n"
|
||||
" The path corresponds to a POSIX shm name. To use a\n"
|
||||
" real file, for instance in a hugetlbfs, use\n"
|
||||
" /../../abspath/to/file.\n"
|
||||
" default=%s\n", IVSHMEM_SERVER_DEFAULT_SHM_PATH);
|
||||
fprintf(stderr, " -l <size>: size of shared memory in bytes. The suffix\n"
|
||||
" K, M and G can be used (ex: 1K means 1024).\n"
|
||||
" default=%u\n", IVSHMEM_SERVER_DEFAULT_SHM_SIZE);
|
||||
fprintf(stderr, " -n <n_vects>: number of vectors.\n"
|
||||
" default=%u\n", IVSHMEM_SERVER_DEFAULT_N_VECTORS);
|
||||
|
||||
exit(code);
|
||||
}
|
||||
|
||||
/* parse the program arguments, exit on error */
|
||||
static void
|
||||
ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[])
|
||||
{
|
||||
int c;
|
||||
unsigned long long v;
|
||||
Error *errp = NULL;
|
||||
|
||||
while ((c = getopt(argc, argv,
|
||||
"h" /* help */
|
||||
"v" /* verbose */
|
||||
"F" /* foreground */
|
||||
"p:" /* pid_file */
|
||||
"S:" /* unix_socket_path */
|
||||
"m:" /* shm_path */
|
||||
"l:" /* shm_size */
|
||||
"n:" /* n_vectors */
|
||||
)) != -1) {
|
||||
|
||||
switch (c) {
|
||||
case 'h': /* help */
|
||||
ivshmem_server_usage(argv[0], 0);
|
||||
break;
|
||||
|
||||
case 'v': /* verbose */
|
||||
args->verbose = 1;
|
||||
break;
|
||||
|
||||
case 'F': /* foreground */
|
||||
args->foreground = 1;
|
||||
break;
|
||||
|
||||
case 'p': /* pid_file */
|
||||
args->pid_file = strdup(optarg);
|
||||
break;
|
||||
|
||||
case 'S': /* unix_socket_path */
|
||||
args->unix_socket_path = strdup(optarg);
|
||||
break;
|
||||
|
||||
case 'm': /* shm_path */
|
||||
args->shm_path = strdup(optarg);
|
||||
break;
|
||||
|
||||
case 'l': /* shm_size */
|
||||
parse_option_size("shm_size", optarg, &args->shm_size, &errp);
|
||||
if (errp) {
|
||||
fprintf(stderr, "cannot parse shm size: %s\n",
|
||||
error_get_pretty(errp));
|
||||
error_free(errp);
|
||||
ivshmem_server_usage(argv[0], 1);
|
||||
}
|
||||
break;
|
||||
|
||||
case 'n': /* n_vectors */
|
||||
if (parse_uint_full(optarg, &v, 0) < 0) {
|
||||
fprintf(stderr, "cannot parse n_vectors\n");
|
||||
ivshmem_server_usage(argv[0], 1);
|
||||
}
|
||||
args->n_vectors = v;
|
||||
break;
|
||||
|
||||
default:
|
||||
ivshmem_server_usage(argv[0], 1);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (args->n_vectors > IVSHMEM_SERVER_MAX_VECTORS) {
|
||||
fprintf(stderr, "too many requested vectors (max is %d)\n",
|
||||
IVSHMEM_SERVER_MAX_VECTORS);
|
||||
ivshmem_server_usage(argv[0], 1);
|
||||
}
|
||||
|
||||
if (args->verbose == 1 && args->foreground == 0) {
|
||||
fprintf(stderr, "cannot use verbose in daemon mode\n");
|
||||
ivshmem_server_usage(argv[0], 1);
|
||||
}
|
||||
}
|
||||
|
||||
/* wait for events on listening server unix socket and connected client
|
||||
* sockets */
|
||||
static int
|
||||
ivshmem_server_poll_events(IvshmemServer *server)
|
||||
{
|
||||
fd_set fds;
|
||||
int ret = 0, maxfd;
|
||||
|
||||
while (!ivshmem_server_quit) {
|
||||
|
||||
FD_ZERO(&fds);
|
||||
maxfd = 0;
|
||||
ivshmem_server_get_fds(server, &fds, &maxfd);
|
||||
|
||||
ret = select(maxfd, &fds, NULL, NULL, NULL);
|
||||
|
||||
if (ret < 0) {
|
||||
if (errno == EINTR) {
|
||||
continue;
|
||||
}
|
||||
|
||||
fprintf(stderr, "select error: %s\n", strerror(errno));
|
||||
break;
|
||||
}
|
||||
if (ret == 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (ivshmem_server_handle_fds(server, &fds, maxfd) < 0) {
|
||||
fprintf(stderr, "ivshmem_server_handle_fds() failed\n");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void
|
||||
ivshmem_server_quit_cb(int signum)
|
||||
{
|
||||
ivshmem_server_quit = 1;
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
IvshmemServer server;
|
||||
struct sigaction sa, sa_quit;
|
||||
IvshmemServerArgs args = {
|
||||
.verbose = IVSHMEM_SERVER_DEFAULT_VERBOSE,
|
||||
.foreground = IVSHMEM_SERVER_DEFAULT_FOREGROUND,
|
||||
.pid_file = IVSHMEM_SERVER_DEFAULT_PID_FILE,
|
||||
.unix_socket_path = IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH,
|
||||
.shm_path = IVSHMEM_SERVER_DEFAULT_SHM_PATH,
|
||||
.shm_size = IVSHMEM_SERVER_DEFAULT_SHM_SIZE,
|
||||
.n_vectors = IVSHMEM_SERVER_DEFAULT_N_VECTORS,
|
||||
};
|
||||
int ret = 1;
|
||||
|
||||
/* parse arguments, will exit on error */
|
||||
ivshmem_server_parse_args(&args, argc, argv);
|
||||
|
||||
/* Ignore SIGPIPE, see this link for more info:
|
||||
* http://www.mail-archive.com/libevent-users@monkey.org/msg01606.html */
|
||||
sa.sa_handler = SIG_IGN;
|
||||
sa.sa_flags = 0;
|
||||
if (sigemptyset(&sa.sa_mask) == -1 ||
|
||||
sigaction(SIGPIPE, &sa, 0) == -1) {
|
||||
perror("failed to ignore SIGPIPE; sigaction");
|
||||
goto err;
|
||||
}
|
||||
|
||||
sa_quit.sa_handler = ivshmem_server_quit_cb;
|
||||
sa_quit.sa_flags = 0;
|
||||
if (sigemptyset(&sa_quit.sa_mask) == -1 ||
|
||||
sigaction(SIGTERM, &sa_quit, 0) == -1) {
|
||||
perror("failed to add SIGTERM handler; sigaction");
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* init the ivshms structure */
|
||||
if (ivshmem_server_init(&server, args.unix_socket_path, args.shm_path,
|
||||
args.shm_size, args.n_vectors, args.verbose) < 0) {
|
||||
fprintf(stderr, "cannot init server\n");
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* start the ivshmem server (open shm & unix socket) */
|
||||
if (ivshmem_server_start(&server) < 0) {
|
||||
fprintf(stderr, "cannot bind\n");
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* daemonize if asked to */
|
||||
if (!args.foreground) {
|
||||
FILE *fp;
|
||||
|
||||
if (qemu_daemon(1, 1) < 0) {
|
||||
fprintf(stderr, "cannot daemonize: %s\n", strerror(errno));
|
||||
goto err_close;
|
||||
}
|
||||
|
||||
/* write pid file */
|
||||
fp = fopen(args.pid_file, "w");
|
||||
if (fp == NULL) {
|
||||
fprintf(stderr, "cannot write pid file: %s\n", strerror(errno));
|
||||
goto err_close;
|
||||
}
|
||||
|
||||
fprintf(fp, "%d\n", (int) getpid());
|
||||
fclose(fp);
|
||||
}
|
||||
|
||||
ivshmem_server_poll_events(&server);
|
||||
fprintf(stdout, "server disconnected\n");
|
||||
ret = 0;
|
||||
|
||||
err_close:
|
||||
ivshmem_server_close(&server);
|
||||
err:
|
||||
return ret;
|
||||
}
|
|
@ -1266,9 +1266,13 @@ is qemu.git/contrib/ivshmem-server. An example syntax when using the shared
|
|||
memory server is:
|
||||
|
||||
@example
|
||||
qemu-system-i386 -device ivshmem,size=<size in format accepted by -m>[,chardev=<id>]
|
||||
[,msi=on][,ioeventfd=on][,vectors=n][,role=peer|master]
|
||||
qemu-system-i386 -chardev socket,path=<path>,id=<id>
|
||||
# First start the ivshmem server once and for all
|
||||
ivshmem-server -p <pidfile> -S <path> -m <shm name> -l <shm size> -n <vectors n>
|
||||
|
||||
# Then start your qemu instances with matching arguments
|
||||
qemu-system-i386 -device ivshmem,size=<shm size>,vectors=<vectors n>,chardev=<id>
|
||||
[,msi=on][,ioeventfd=on][,role=peer|master]
|
||||
-chardev socket,path=<path>,id=<id>
|
||||
@end example
|
||||
|
||||
When using the server, the guest will be assigned a VM ID (>=0) that allows guests
|
||||
|
|
Loading…
Reference in a new issue