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xemu/tests/vhost-user-bridge.c
Wei Yang 038adc2f58 core: replace getpagesize() with qemu_real_host_page_size 
There are three page size in qemu:

  real host page size
  host page size
  target page size

All of them have dedicate variable to represent. For the last two, we
use the same form in the whole qemu project, while for the first one we
use two forms: qemu_real_host_page_size and getpagesize().

qemu_real_host_page_size is defined to be a replacement of
getpagesize(), so let it serve the role.

[Note] Not fully tested for some arch or device.

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20191013021145.16011-3-richardw.yang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-10-26 15:38:06 +02:00

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/*
* Vhost User Bridge
*
* Copyright (c) 2015 Red Hat, Inc.
*
* Authors:
* Victor Kaplansky <victork@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
/*
* TODO:
* - main should get parameters from the command line.
* - implement all request handlers. Still not implemented:
* vubr_get_queue_num_exec()
* vubr_send_rarp_exec()
* - test for broken requests and virtqueue.
* - implement features defined by Virtio 1.0 spec.
* - support mergeable buffers and indirect descriptors.
* - implement clean shutdown.
* - implement non-blocking writes to UDP backend.
* - implement polling strategy.
* - implement clean starting/stopping of vq processing
* - implement clean starting/stopping of used and buffers
* dirty page logging.
*/
#define _FILE_OFFSET_BITS 64
#include "qemu/osdep.h"
#include "qemu/atomic.h"
#include "qemu/ctype.h"
#include "qemu/iov.h"
#include "standard-headers/linux/virtio_net.h"
#include "contrib/libvhost-user/libvhost-user.h"
#define VHOST_USER_BRIDGE_DEBUG 1
#define DPRINT(...) \
do { \
if (VHOST_USER_BRIDGE_DEBUG) { \
printf(__VA_ARGS__); \
} \
} while (0)
enum {
VHOST_USER_BRIDGE_MAX_QUEUES = 8,
};
typedef void (*CallbackFunc)(int sock, void *ctx);
typedef struct Event {
void *ctx;
CallbackFunc callback;
} Event;
typedef struct Dispatcher {
int max_sock;
fd_set fdset;
Event events[FD_SETSIZE];
} Dispatcher;
typedef struct VubrDev {
VuDev vudev;
Dispatcher dispatcher;
int backend_udp_sock;
struct sockaddr_in backend_udp_dest;
int hdrlen;
int sock;
int ready;
int quit;
struct {
int fd;
void *addr;
pthread_t thread;
} notifier;
} VubrDev;
static void
vubr_die(const char *s)
{
perror(s);
exit(1);
}
static int
dispatcher_init(Dispatcher *dispr)
{
FD_ZERO(&dispr->fdset);
dispr->max_sock = -1;
return 0;
}
static int
dispatcher_add(Dispatcher *dispr, int sock, void *ctx, CallbackFunc cb)
{
if (sock >= FD_SETSIZE) {
fprintf(stderr,
"Error: Failed to add new event. sock %d should be less than %d\n",
sock, FD_SETSIZE);
return -1;
}
dispr->events[sock].ctx = ctx;
dispr->events[sock].callback = cb;
FD_SET(sock, &dispr->fdset);
if (sock > dispr->max_sock) {
dispr->max_sock = sock;
}
DPRINT("Added sock %d for watching. max_sock: %d\n",
sock, dispr->max_sock);
return 0;
}
static int
dispatcher_remove(Dispatcher *dispr, int sock)
{
if (sock >= FD_SETSIZE) {
fprintf(stderr,
"Error: Failed to remove event. sock %d should be less than %d\n",
sock, FD_SETSIZE);
return -1;
}
FD_CLR(sock, &dispr->fdset);
DPRINT("Sock %d removed from dispatcher watch.\n", sock);
return 0;
}
/* timeout in us */
static int
dispatcher_wait(Dispatcher *dispr, uint32_t timeout)
{
struct timeval tv;
tv.tv_sec = timeout / 1000000;
tv.tv_usec = timeout % 1000000;
fd_set fdset = dispr->fdset;
/* wait until some of sockets become readable. */
int rc = select(dispr->max_sock + 1, &fdset, 0, 0, &tv);
if (rc == -1) {
vubr_die("select");
}
/* Timeout */
if (rc == 0) {
return 0;
}
/* Now call callback for every ready socket. */
int sock;
for (sock = 0; sock < dispr->max_sock + 1; sock++) {
/* The callback on a socket can remove other sockets from the
* dispatcher, thus we have to check that the socket is
* still not removed from dispatcher's list
*/
if (FD_ISSET(sock, &fdset) && FD_ISSET(sock, &dispr->fdset)) {
Event *e = &dispr->events[sock];
e->callback(sock, e->ctx);
}
}
return 0;
}
static void
vubr_handle_tx(VuDev *dev, int qidx)
{
VuVirtq *vq = vu_get_queue(dev, qidx);
VubrDev *vubr = container_of(dev, VubrDev, vudev);
int hdrlen = vubr->hdrlen;
VuVirtqElement *elem = NULL;
assert(qidx % 2);
for (;;) {
ssize_t ret;
unsigned int out_num;
struct iovec sg[VIRTQUEUE_MAX_SIZE], *out_sg;
elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
if (!elem) {
break;
}
out_num = elem->out_num;
out_sg = elem->out_sg;
if (out_num < 1) {
fprintf(stderr, "virtio-net header not in first element\n");
break;
}
if (VHOST_USER_BRIDGE_DEBUG) {
iov_hexdump(out_sg, out_num, stderr, "TX:", 1024);
}
if (hdrlen) {
unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
out_sg, out_num,
hdrlen, -1);
out_num = sg_num;
out_sg = sg;
}
struct msghdr msg = {
.msg_name = (struct sockaddr *) &vubr->backend_udp_dest,
.msg_namelen = sizeof(struct sockaddr_in),
.msg_iov = out_sg,
.msg_iovlen = out_num,
};
do {
ret = sendmsg(vubr->backend_udp_sock, &msg, 0);
} while (ret == -1 && (errno == EAGAIN || errno == EINTR));
if (ret == -1) {
vubr_die("sendmsg()");
}
vu_queue_push(dev, vq, elem, 0);
vu_queue_notify(dev, vq);
free(elem);
elem = NULL;
}
free(elem);
}
/* this function reverse the effect of iov_discard_front() it must be
* called with 'front' being the original struct iovec and 'bytes'
* being the number of bytes you shaved off
*/
static void
iov_restore_front(struct iovec *front, struct iovec *iov, size_t bytes)
{
struct iovec *cur;
for (cur = front; cur != iov; cur++) {
assert(bytes >= cur->iov_len);
bytes -= cur->iov_len;
}
cur->iov_base -= bytes;
cur->iov_len += bytes;
}
static void
iov_truncate(struct iovec *iov, unsigned iovc, size_t bytes)
{
unsigned i;
for (i = 0; i < iovc; i++, iov++) {
if (bytes < iov->iov_len) {
iov->iov_len = bytes;
return;
}
bytes -= iov->iov_len;
}
assert(!"couldn't truncate iov");
}
static void
vubr_backend_recv_cb(int sock, void *ctx)
{
VubrDev *vubr = (VubrDev *) ctx;
VuDev *dev = &vubr->vudev;
VuVirtq *vq = vu_get_queue(dev, 0);
VuVirtqElement *elem = NULL;
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
struct virtio_net_hdr_mrg_rxbuf mhdr;
unsigned mhdr_cnt = 0;
int hdrlen = vubr->hdrlen;
int i = 0;
struct virtio_net_hdr hdr = {
.flags = 0,
.gso_type = VIRTIO_NET_HDR_GSO_NONE
};
DPRINT("\n\n *** IN UDP RECEIVE CALLBACK ***\n\n");
DPRINT(" hdrlen = %d\n", hdrlen);
if (!vu_queue_enabled(dev, vq) ||
!vu_queue_started(dev, vq) ||
!vu_queue_avail_bytes(dev, vq, hdrlen, 0)) {
DPRINT("Got UDP packet, but no available descriptors on RX virtq.\n");
return;
}
while (1) {
struct iovec *sg;
ssize_t ret, total = 0;
unsigned int num;
elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
if (!elem) {
break;
}
if (elem->in_num < 1) {
fprintf(stderr, "virtio-net contains no in buffers\n");
break;
}
sg = elem->in_sg;
num = elem->in_num;
if (i == 0) {
if (hdrlen == 12) {
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
sg, elem->in_num,
offsetof(typeof(mhdr), num_buffers),
sizeof(mhdr.num_buffers));
}
iov_from_buf(sg, elem->in_num, 0, &hdr, sizeof hdr);
total += hdrlen;
ret = iov_discard_front(&sg, &num, hdrlen);
assert(ret == hdrlen);
}
struct msghdr msg = {
.msg_name = (struct sockaddr *) &vubr->backend_udp_dest,
.msg_namelen = sizeof(struct sockaddr_in),
.msg_iov = sg,
.msg_iovlen = num,
.msg_flags = MSG_DONTWAIT,
};
do {
ret = recvmsg(vubr->backend_udp_sock, &msg, 0);
} while (ret == -1 && (errno == EINTR));
if (i == 0) {
iov_restore_front(elem->in_sg, sg, hdrlen);
}
if (ret == -1) {
if (errno == EWOULDBLOCK) {
vu_queue_rewind(dev, vq, 1);
break;
}
vubr_die("recvmsg()");
}
total += ret;
iov_truncate(elem->in_sg, elem->in_num, total);
vu_queue_fill(dev, vq, elem, total, i++);
free(elem);
elem = NULL;
break; /* could loop if DONTWAIT worked? */
}
if (mhdr_cnt) {
mhdr.num_buffers = i;
iov_from_buf(mhdr_sg, mhdr_cnt,
0,
&mhdr.num_buffers, sizeof mhdr.num_buffers);
}
vu_queue_flush(dev, vq, i);
vu_queue_notify(dev, vq);
free(elem);
}
static void
vubr_receive_cb(int sock, void *ctx)
{
VubrDev *vubr = (VubrDev *)ctx;
if (!vu_dispatch(&vubr->vudev)) {
fprintf(stderr, "Error while dispatching\n");
}
}
typedef struct WatchData {
VuDev *dev;
vu_watch_cb cb;
void *data;
} WatchData;
static void
watch_cb(int sock, void *ctx)
{
struct WatchData *wd = ctx;
wd->cb(wd->dev, VU_WATCH_IN, wd->data);
}
static void
vubr_set_watch(VuDev *dev, int fd, int condition,
vu_watch_cb cb, void *data)
{
VubrDev *vubr = container_of(dev, VubrDev, vudev);
static WatchData watches[FD_SETSIZE];
struct WatchData *wd = &watches[fd];
wd->cb = cb;
wd->data = data;
wd->dev = dev;
dispatcher_add(&vubr->dispatcher, fd, wd, watch_cb);
}
static void
vubr_remove_watch(VuDev *dev, int fd)
{
VubrDev *vubr = container_of(dev, VubrDev, vudev);
dispatcher_remove(&vubr->dispatcher, fd);
}
static int
vubr_send_rarp_exec(VuDev *dev, VhostUserMsg *vmsg)
{
DPRINT("Function %s() not implemented yet.\n", __func__);
return 0;
}
static int
vubr_process_msg(VuDev *dev, VhostUserMsg *vmsg, int *do_reply)
{
switch (vmsg->request) {
case VHOST_USER_SEND_RARP:
*do_reply = vubr_send_rarp_exec(dev, vmsg);
return 1;
default:
/* let the library handle the rest */
return 0;
}
return 0;
}
static void
vubr_set_features(VuDev *dev, uint64_t features)
{
VubrDev *vubr = container_of(dev, VubrDev, vudev);
if ((features & (1ULL << VIRTIO_F_VERSION_1)) ||
(features & (1ULL << VIRTIO_NET_F_MRG_RXBUF))) {
vubr->hdrlen = 12;
} else {
vubr->hdrlen = 10;
}
}
static uint64_t
vubr_get_features(VuDev *dev)
{
return 1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE |
1ULL << VIRTIO_NET_F_MRG_RXBUF |
1ULL << VIRTIO_F_VERSION_1;
}
static void
vubr_queue_set_started(VuDev *dev, int qidx, bool started)
{
VubrDev *vubr = container_of(dev, VubrDev, vudev);
VuVirtq *vq = vu_get_queue(dev, qidx);
if (started && vubr->notifier.fd >= 0) {
vu_set_queue_host_notifier(dev, vq, vubr->notifier.fd,
qemu_real_host_page_size,
qidx * qemu_real_host_page_size);
}
if (qidx % 2 == 1) {
vu_set_queue_handler(dev, vq, started ? vubr_handle_tx : NULL);
}
}
static void
vubr_panic(VuDev *dev, const char *msg)
{
VubrDev *vubr = container_of(dev, VubrDev, vudev);
fprintf(stderr, "PANIC: %s\n", msg);
dispatcher_remove(&vubr->dispatcher, dev->sock);
vubr->quit = 1;
}
static bool
vubr_queue_is_processed_in_order(VuDev *dev, int qidx)
{
return true;
}
static const VuDevIface vuiface = {
.get_features = vubr_get_features,
.set_features = vubr_set_features,
.process_msg = vubr_process_msg,
.queue_set_started = vubr_queue_set_started,
.queue_is_processed_in_order = vubr_queue_is_processed_in_order,
};
static void
vubr_accept_cb(int sock, void *ctx)
{
VubrDev *dev = (VubrDev *)ctx;
int conn_fd;
struct sockaddr_un un;
socklen_t len = sizeof(un);
conn_fd = accept(sock, (struct sockaddr *) &un, &len);
if (conn_fd == -1) {
vubr_die("accept()");
}
DPRINT("Got connection from remote peer on sock %d\n", conn_fd);
if (!vu_init(&dev->vudev,
VHOST_USER_BRIDGE_MAX_QUEUES,
conn_fd,
vubr_panic,
vubr_set_watch,
vubr_remove_watch,
&vuiface)) {
fprintf(stderr, "Failed to initialize libvhost-user\n");
exit(1);
}
dispatcher_add(&dev->dispatcher, conn_fd, ctx, vubr_receive_cb);
dispatcher_remove(&dev->dispatcher, sock);
}
static VubrDev *
vubr_new(const char *path, bool client)
{
VubrDev *dev = (VubrDev *) calloc(1, sizeof(VubrDev));
struct sockaddr_un un;
CallbackFunc cb;
size_t len;
/* Get a UNIX socket. */
dev->sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (dev->sock == -1) {
vubr_die("socket");
}
dev->notifier.fd = -1;
un.sun_family = AF_UNIX;
strcpy(un.sun_path, path);
len = sizeof(un.sun_family) + strlen(path);
if (!client) {
unlink(path);
if (bind(dev->sock, (struct sockaddr *) &un, len) == -1) {
vubr_die("bind");
}
if (listen(dev->sock, 1) == -1) {
vubr_die("listen");
}
cb = vubr_accept_cb;
DPRINT("Waiting for connections on UNIX socket %s ...\n", path);
} else {
if (connect(dev->sock, (struct sockaddr *)&un, len) == -1) {
vubr_die("connect");
}
if (!vu_init(&dev->vudev,
VHOST_USER_BRIDGE_MAX_QUEUES,
dev->sock,
vubr_panic,
vubr_set_watch,
vubr_remove_watch,
&vuiface)) {
fprintf(stderr, "Failed to initialize libvhost-user\n");
exit(1);
}
cb = vubr_receive_cb;
}
dispatcher_init(&dev->dispatcher);
dispatcher_add(&dev->dispatcher, dev->sock, (void *)dev, cb);
return dev;
}
static void *notifier_thread(void *arg)
{
VuDev *dev = (VuDev *)arg;
VubrDev *vubr = container_of(dev, VubrDev, vudev);
int pagesize = qemu_real_host_page_size;
int qidx;
while (true) {
for (qidx = 0; qidx < VHOST_USER_BRIDGE_MAX_QUEUES; qidx++) {
uint16_t *n = vubr->notifier.addr + pagesize * qidx;
if (*n == qidx) {
*n = 0xffff;
/* We won't miss notifications if we reset
* the memory first. */
smp_mb();
DPRINT("Got a notification for queue%d via host notifier.\n",
qidx);
if (qidx % 2 == 1) {
vubr_handle_tx(dev, qidx);
}
}
usleep(1000);
}
}
return NULL;
}
static void
vubr_host_notifier_setup(VubrDev *dev)
{
char template[] = "/tmp/vubr-XXXXXX";
pthread_t thread;
size_t length;
void *addr;
int fd;
length = qemu_real_host_page_size * VHOST_USER_BRIDGE_MAX_QUEUES;
fd = mkstemp(template);
if (fd < 0) {
vubr_die("mkstemp()");
}
if (posix_fallocate(fd, 0, length) != 0) {
vubr_die("posix_fallocate()");
}
addr = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (addr == MAP_FAILED) {
vubr_die("mmap()");
}
memset(addr, 0xff, length);
if (pthread_create(&thread, NULL, notifier_thread, &dev->vudev) != 0) {
vubr_die("pthread_create()");
}
dev->notifier.fd = fd;
dev->notifier.addr = addr;
dev->notifier.thread = thread;
}
static void
vubr_set_host(struct sockaddr_in *saddr, const char *host)
{
if (qemu_isdigit(host[0])) {
if (!inet_aton(host, &saddr->sin_addr)) {
fprintf(stderr, "inet_aton() failed.\n");
exit(1);
}
} else {
struct hostent *he = gethostbyname(host);
if (!he) {
fprintf(stderr, "gethostbyname() failed.\n");
exit(1);
}
saddr->sin_addr = *(struct in_addr *)he->h_addr;
}
}
static void
vubr_backend_udp_setup(VubrDev *dev,
const char *local_host,
const char *local_port,
const char *remote_host,
const char *remote_port)
{
int sock;
const char *r;
int lport, rport;
lport = strtol(local_port, (char **)&r, 0);
if (r == local_port) {
fprintf(stderr, "lport parsing failed.\n");
exit(1);
}
rport = strtol(remote_port, (char **)&r, 0);
if (r == remote_port) {
fprintf(stderr, "rport parsing failed.\n");
exit(1);
}
struct sockaddr_in si_local = {
.sin_family = AF_INET,
.sin_port = htons(lport),
};
vubr_set_host(&si_local, local_host);
/* setup destination for sends */
dev->backend_udp_dest = (struct sockaddr_in) {
.sin_family = AF_INET,
.sin_port = htons(rport),
};
vubr_set_host(&dev->backend_udp_dest, remote_host);
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock == -1) {
vubr_die("socket");
}
if (bind(sock, (struct sockaddr *)&si_local, sizeof(si_local)) == -1) {
vubr_die("bind");
}
dev->backend_udp_sock = sock;
dispatcher_add(&dev->dispatcher, sock, dev, vubr_backend_recv_cb);
DPRINT("Waiting for data from udp backend on %s:%d...\n",
local_host, lport);
}
static void
vubr_run(VubrDev *dev)
{
while (!dev->quit) {
/* timeout 200ms */
dispatcher_wait(&dev->dispatcher, 200000);
/* Here one can try polling strategy. */
}
}
static int
vubr_parse_host_port(const char **host, const char **port, const char *buf)
{
char *p = strchr(buf, ':');
if (!p) {
return -1;
}
*p = '\0';
*host = strdup(buf);
*port = strdup(p + 1);
return 0;
}
#define DEFAULT_UD_SOCKET "/tmp/vubr.sock"
#define DEFAULT_LHOST "127.0.0.1"
#define DEFAULT_LPORT "4444"
#define DEFAULT_RHOST "127.0.0.1"
#define DEFAULT_RPORT "5555"
static const char *ud_socket_path = DEFAULT_UD_SOCKET;
static const char *lhost = DEFAULT_LHOST;
static const char *lport = DEFAULT_LPORT;
static const char *rhost = DEFAULT_RHOST;
static const char *rport = DEFAULT_RPORT;
int
main(int argc, char *argv[])
{
VubrDev *dev;
int opt;
bool client = false;
bool host_notifier = false;
while ((opt = getopt(argc, argv, "l:r:u:cH")) != -1) {
switch (opt) {
case 'l':
if (vubr_parse_host_port(&lhost, &lport, optarg) < 0) {
goto out;
}
break;
case 'r':
if (vubr_parse_host_port(&rhost, &rport, optarg) < 0) {
goto out;
}
break;
case 'u':
ud_socket_path = strdup(optarg);
break;
case 'c':
client = true;
break;
case 'H':
host_notifier = true;
break;
default:
goto out;
}
}
DPRINT("ud socket: %s (%s)\n", ud_socket_path,
client ? "client" : "server");
DPRINT("local: %s:%s\n", lhost, lport);
DPRINT("remote: %s:%s\n", rhost, rport);
dev = vubr_new(ud_socket_path, client);
if (!dev) {
return 1;
}
if (host_notifier) {
vubr_host_notifier_setup(dev);
}
vubr_backend_udp_setup(dev, lhost, lport, rhost, rport);
vubr_run(dev);
vu_deinit(&dev->vudev);
return 0;
out:
fprintf(stderr, "Usage: %s ", argv[0]);
fprintf(stderr, "[-c] [-H] [-u ud_socket_path] [-l lhost:lport] [-r rhost:rport]\n");
fprintf(stderr, "\t-u path to unix doman socket. default: %s\n",
DEFAULT_UD_SOCKET);
fprintf(stderr, "\t-l local host and port. default: %s:%s\n",
DEFAULT_LHOST, DEFAULT_LPORT);
fprintf(stderr, "\t-r remote host and port. default: %s:%s\n",
DEFAULT_RHOST, DEFAULT_RPORT);
fprintf(stderr, "\t-c client mode\n");
fprintf(stderr, "\t-H use host notifier\n");
return 1;
}
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