Add the vhost-user netdev backend to the command line

The supplied chardev id will be inspected for supported options. Only
a socket backend, with a set path (i.e. a Unix socket) and optionally
the server parameter set, will be allowed. Other options (nowait, telnet)
will make the chardev unusable and the netdev will not be initialised.

Additional checks for validity:
  - requires `-numa node,memdev=..`
  - requires `-device virtio-net-*`

The `vhostforce` option is used to force vhost-net when we deal with
non-MSIX guests.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Nikolay Nikolaev 2014-06-10 13:02:16 +03:00 committed by Michael S. Tsirkin
parent d314f586b3
commit 03ce574442
8 changed files with 160 additions and 7 deletions

3
configure vendored
View File

@ -4515,6 +4515,9 @@ fi
if test "$vhost_scsi" = "yes" ; then
echo "CONFIG_VHOST_SCSI=y" >> $config_host_mak
fi
if test "$vhost_net" = "yes" ; then
echo "CONFIG_VHOST_NET_USED=y" >> $config_host_mak
fi
if test "$blobs" = "yes" ; then
echo "INSTALL_BLOBS=yes" >> $config_host_mak
fi

View File

@ -1211,7 +1211,7 @@ ETEXI
{
.name = "host_net_add",
.args_type = "device:s,opts:s?",
.params = "tap|user|socket|vde|netmap|bridge|dump [options]",
.params = "tap|user|socket|vde|netmap|bridge|vhost-user|dump [options]",
.help = "add host VLAN client",
.mhandler.cmd = net_host_device_add,
.command_completion = host_net_add_completion,
@ -1241,7 +1241,7 @@ ETEXI
{
.name = "netdev_add",
.args_type = "netdev:O",
.params = "[user|tap|socket|vde|bridge|hubport|netmap],id=str[,prop=value][,...]",
.params = "[user|tap|socket|vde|bridge|hubport|netmap|vhost-user],id=str[,prop=value][,...]",
.help = "add host network device",
.mhandler.cmd = hmp_netdev_add,
.command_completion = netdev_add_completion,

View File

@ -15,6 +15,7 @@
#include "net/net.h"
#include "net/tap.h"
#include "net/vhost-user.h"
#include "hw/virtio/virtio-net.h"
#include "net/vhost_net.h"
@ -360,6 +361,9 @@ VHostNetState *get_vhost_net(NetClientState *nc)
case NET_CLIENT_OPTIONS_KIND_TAP:
vhost_net = tap_get_vhost_net(nc);
break;
case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
vhost_net = vhost_user_get_vhost_net(nc);
break;
default:
break;
}

View File

@ -322,6 +322,7 @@ void net_hub_check_clients(void)
case NET_CLIENT_OPTIONS_KIND_TAP:
case NET_CLIENT_OPTIONS_KIND_SOCKET:
case NET_CLIENT_OPTIONS_KIND_VDE:
case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
has_host_dev = 1;
break;
default:

View File

@ -62,6 +62,7 @@ const char *host_net_devices[] = {
#ifdef CONFIG_VDE
"vde",
#endif
"vhost-user",
NULL,
};
@ -802,6 +803,9 @@ static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
[NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge,
#endif
[NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport,
#ifdef CONFIG_VHOST_NET_USED
[NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
#endif
};
@ -835,6 +839,9 @@ static int net_client_init1(const void *object, int is_netdev, Error **errp)
case NET_CLIENT_OPTIONS_KIND_BRIDGE:
#endif
case NET_CLIENT_OPTIONS_KIND_HUBPORT:
#ifdef CONFIG_VHOST_NET_USED
case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
#endif
break;
default:

View File

@ -12,6 +12,7 @@
#include "net/vhost_net.h"
#include "net/vhost-user.h"
#include "sysemu/char.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
typedef struct VhostUserState {
@ -21,9 +22,16 @@ typedef struct VhostUserState {
VHostNetState *vhost_net;
} VhostUserState;
typedef struct VhostUserChardevProps {
bool is_socket;
bool is_unix;
bool is_server;
} VhostUserChardevProps;
VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
{
VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
return s->vhost_net;
}
@ -82,7 +90,7 @@ static bool vhost_user_has_ufo(NetClientState *nc)
}
static NetClientInfo net_vhost_user_info = {
.type = 0,
.type = NET_CLIENT_OPTIONS_KIND_VHOST_USER,
.size = sizeof(VhostUserState),
.cleanup = vhost_user_cleanup,
.has_vnet_hdr = vhost_user_has_vnet_hdr,
@ -148,8 +156,103 @@ static int net_vhost_user_init(NetClientState *peer, const char *device,
return 0;
}
static int net_vhost_chardev_opts(const char *name, const char *value,
void *opaque)
{
VhostUserChardevProps *props = opaque;
if (strcmp(name, "backend") == 0 && strcmp(value, "socket") == 0) {
props->is_socket = true;
} else if (strcmp(name, "path") == 0) {
props->is_unix = true;
} else if (strcmp(name, "server") == 0) {
props->is_server = true;
} else {
error_report("vhost-user does not support a chardev"
" with the following option:\n %s = %s",
name, value);
return -1;
}
return 0;
}
static CharDriverState *net_vhost_parse_chardev(const NetdevVhostUserOptions *opts)
{
CharDriverState *chr = qemu_chr_find(opts->chardev);
VhostUserChardevProps props;
if (chr == NULL) {
error_report("chardev \"%s\" not found", opts->chardev);
return NULL;
}
/* inspect chardev opts */
memset(&props, 0, sizeof(props));
if (qemu_opt_foreach(chr->opts, net_vhost_chardev_opts, &props, true) != 0) {
return NULL;
}
if (!props.is_socket || !props.is_unix) {
error_report("chardev \"%s\" is not a unix socket",
opts->chardev);
return NULL;
}
qemu_chr_fe_claim_no_fail(chr);
return chr;
}
static int net_vhost_check_net(QemuOpts *opts, void *opaque)
{
const char *name = opaque;
const char *driver, *netdev;
const char virtio_name[] = "virtio-net-";
driver = qemu_opt_get(opts, "driver");
netdev = qemu_opt_get(opts, "netdev");
if (!driver || !netdev) {
return 0;
}
if (strcmp(netdev, name) == 0 &&
strncmp(driver, virtio_name, strlen(virtio_name)) != 0) {
error_report("vhost-user requires frontend driver virtio-net-*");
return -1;
}
return 0;
}
int net_init_vhost_user(const NetClientOptions *opts, const char *name,
NetClientState *peer)
{
return net_vhost_user_init(peer, "vhost_user", 0, 0, 0);
const NetdevVhostUserOptions *vhost_user_opts;
CharDriverState *chr;
bool vhostforce;
assert(opts->kind == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
vhost_user_opts = opts->vhost_user;
chr = net_vhost_parse_chardev(vhost_user_opts);
if (!chr) {
error_report("No suitable chardev found");
return -1;
}
/* verify net frontend */
if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
(char *)name, true) == -1) {
return -1;
}
/* vhostforce for non-MSIX */
if (vhost_user_opts->has_vhostforce) {
vhostforce = vhost_user_opts->vhostforce;
} else {
vhostforce = false;
}
return net_vhost_user_init(peer, "vhost_user", name, chr, vhostforce);
}

View File

@ -2068,6 +2068,22 @@
'ifname': 'str',
'*devname': 'str' } }
##
# @NetdevVhostUserOptions
#
# Vhost-user network backend
#
# @chardev: name of a unix socket chardev
#
# @vhostforce: #optional vhost on for non-MSIX virtio guests (default: false).
#
# Since 2.1
##
{ 'type': 'NetdevVhostUserOptions',
'data': {
'chardev': 'str',
'*vhostforce': 'bool' } }
##
# @NetClientOptions
#
@ -2086,7 +2102,8 @@
'dump': 'NetdevDumpOptions',
'bridge': 'NetdevBridgeOptions',
'hubport': 'NetdevHubPortOptions',
'netmap': 'NetdevNetmapOptions' } }
'netmap': 'NetdevNetmapOptions',
'vhost-user': 'NetdevVhostUserOptions' } }
##
# @NetLegacy

View File

@ -1460,6 +1460,7 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
#ifdef CONFIG_NETMAP
"netmap|"
#endif
"vhost-user|"
"socket|"
"hubport],id=str[,option][,option][,...]\n", QEMU_ARCH_ALL)
STEXI
@ -1791,6 +1792,23 @@ The hubport netdev lets you connect a NIC to a QEMU "vlan" instead of a single
netdev. @code{-net} and @code{-device} with parameter @option{vlan} create the
required hub automatically.
@item -netdev vhost-user,chardev=@var{id}[,vhostforce=on|off]
Establish a vhost-user netdev, backed by a chardev @var{id}. The chardev should
be a unix domain socket backed one. The vhost-user uses a specifically defined
protocol to pass vhost ioctl replacement messages to an application on the other
end of the socket. On non-MSIX guests, the feature can be forced with
@var{vhostforce}.
Example:
@example
qemu -m 512 -object memory-backend-file,id=mem,size=512M,mem-path=/hugetlbfs,share=on \
-numa node,memdev=mem \
-chardev socket,path=/path/to/socket \
-netdev type=vhost-user,id=net0,chardev=chr0 \
-device virtio-net-pci,netdev=net0
@end example
@item -net dump[,vlan=@var{n}][,file=@var{file}][,len=@var{len}]
Dump network traffic on VLAN @var{n} to file @var{file} (@file{qemu-vlan0.pcap} by default).
At most @var{len} bytes (64k by default) per packet are stored. The file format is