qemu/net/hub.c
Eric Blake f394b2e20d qapi: Change Netdev into a flat union
This is a mostly-mechanical conversion that creates a new flat
union 'Netdev' QAPI type that covers all the branches of the
former 'NetClientOptions' simple union, where the branches are
now listed in a new 'NetClientDriver' enum rather than generated
from the simple union.  The existence of a flat union has no
change to the command line syntax accepted for new code, and
will make it possible for a future patch to switch the QMP
command to parse a boxed union for no change to valid QMP; but
it does have some ripple effect on the C code when dealing with
the new types.

While making the conversion, note that the 'NetLegacy' type
remains unchanged: it applies only to legacy command line options,
and will not be ported to QMP, so it should remain a wrapper
around a simple union; to avoid confusion, the type named
'NetClientOptions' is now gone, and we introduce 'NetLegacyOptions'
in its place.  Then, in the C code, we convert from NetLegacy to
Netdev as soon as possible, so that the bulk of the net stack
only has to deal with one QAPI type, not two.  Note that since
the old legacy code always rejected 'hubport', we can just omit
that branch from the new 'NetLegacyOptions' simple union.

Based on an idea originally by Zoltán Kővágó <DirtY.iCE.hu@gmail.com>:
Message-Id: <01a527fbf1a5de880091f98cf011616a78adeeee.1441627176.git.DirtY.iCE.hu@gmail.com>
although the sed script in that patch no longer applies due to
other changes in the tree since then, and I also did some manual
cleanups (such as fixing whitespace to keep checkpatch happy).

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1468468228-27827-13-git-send-email-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Fixup from Eric squashed in]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2016-07-19 20:18:02 +02:00

356 lines
8.2 KiB
C

/*
* Hub net client
*
* Copyright IBM, Corp. 2012
*
* Authors:
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
* Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "monitor/monitor.h"
#include "net/net.h"
#include "clients.h"
#include "hub.h"
#include "qemu/iov.h"
/*
* A hub broadcasts incoming packets to all its ports except the source port.
* Hubs can be used to provide independent network segments, also confusingly
* named the QEMU 'vlan' feature.
*/
typedef struct NetHub NetHub;
typedef struct NetHubPort {
NetClientState nc;
QLIST_ENTRY(NetHubPort) next;
NetHub *hub;
int id;
} NetHubPort;
struct NetHub {
int id;
QLIST_ENTRY(NetHub) next;
int num_ports;
QLIST_HEAD(, NetHubPort) ports;
};
static QLIST_HEAD(, NetHub) hubs = QLIST_HEAD_INITIALIZER(&hubs);
static ssize_t net_hub_receive(NetHub *hub, NetHubPort *source_port,
const uint8_t *buf, size_t len)
{
NetHubPort *port;
QLIST_FOREACH(port, &hub->ports, next) {
if (port == source_port) {
continue;
}
qemu_send_packet(&port->nc, buf, len);
}
return len;
}
static ssize_t net_hub_receive_iov(NetHub *hub, NetHubPort *source_port,
const struct iovec *iov, int iovcnt)
{
NetHubPort *port;
ssize_t len = iov_size(iov, iovcnt);
QLIST_FOREACH(port, &hub->ports, next) {
if (port == source_port) {
continue;
}
qemu_sendv_packet(&port->nc, iov, iovcnt);
}
return len;
}
static NetHub *net_hub_new(int id)
{
NetHub *hub;
hub = g_malloc(sizeof(*hub));
hub->id = id;
hub->num_ports = 0;
QLIST_INIT(&hub->ports);
QLIST_INSERT_HEAD(&hubs, hub, next);
return hub;
}
static int net_hub_port_can_receive(NetClientState *nc)
{
NetHubPort *port;
NetHubPort *src_port = DO_UPCAST(NetHubPort, nc, nc);
NetHub *hub = src_port->hub;
QLIST_FOREACH(port, &hub->ports, next) {
if (port == src_port) {
continue;
}
if (qemu_can_send_packet(&port->nc)) {
return 1;
}
}
return 0;
}
static ssize_t net_hub_port_receive(NetClientState *nc,
const uint8_t *buf, size_t len)
{
NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc);
return net_hub_receive(port->hub, port, buf, len);
}
static ssize_t net_hub_port_receive_iov(NetClientState *nc,
const struct iovec *iov, int iovcnt)
{
NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc);
return net_hub_receive_iov(port->hub, port, iov, iovcnt);
}
static void net_hub_port_cleanup(NetClientState *nc)
{
NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc);
QLIST_REMOVE(port, next);
}
static NetClientInfo net_hub_port_info = {
.type = NET_CLIENT_DRIVER_HUBPORT,
.size = sizeof(NetHubPort),
.can_receive = net_hub_port_can_receive,
.receive = net_hub_port_receive,
.receive_iov = net_hub_port_receive_iov,
.cleanup = net_hub_port_cleanup,
};
static NetHubPort *net_hub_port_new(NetHub *hub, const char *name)
{
NetClientState *nc;
NetHubPort *port;
int id = hub->num_ports++;
char default_name[128];
if (!name) {
snprintf(default_name, sizeof(default_name),
"hub%dport%d", hub->id, id);
name = default_name;
}
nc = qemu_new_net_client(&net_hub_port_info, NULL, "hub", name);
port = DO_UPCAST(NetHubPort, nc, nc);
port->id = id;
port->hub = hub;
QLIST_INSERT_HEAD(&hub->ports, port, next);
return port;
}
/**
* Create a port on a given hub
* @name: Net client name or NULL for default name.
*
* If there is no existing hub with the given id then a new hub is created.
*/
NetClientState *net_hub_add_port(int hub_id, const char *name)
{
NetHub *hub;
NetHubPort *port;
QLIST_FOREACH(hub, &hubs, next) {
if (hub->id == hub_id) {
break;
}
}
if (!hub) {
hub = net_hub_new(hub_id);
}
port = net_hub_port_new(hub, name);
return &port->nc;
}
/**
* Find a specific client on a hub
*/
NetClientState *net_hub_find_client_by_name(int hub_id, const char *name)
{
NetHub *hub;
NetHubPort *port;
NetClientState *peer;
QLIST_FOREACH(hub, &hubs, next) {
if (hub->id == hub_id) {
QLIST_FOREACH(port, &hub->ports, next) {
peer = port->nc.peer;
if (peer && strcmp(peer->name, name) == 0) {
return peer;
}
}
}
}
return NULL;
}
/**
* Find a available port on a hub; otherwise create one new port
*/
NetClientState *net_hub_port_find(int hub_id)
{
NetHub *hub;
NetHubPort *port;
NetClientState *nc;
QLIST_FOREACH(hub, &hubs, next) {
if (hub->id == hub_id) {
QLIST_FOREACH(port, &hub->ports, next) {
nc = port->nc.peer;
if (!nc) {
return &(port->nc);
}
}
break;
}
}
nc = net_hub_add_port(hub_id, NULL);
return nc;
}
/**
* Print hub configuration
*/
void net_hub_info(Monitor *mon)
{
NetHub *hub;
NetHubPort *port;
QLIST_FOREACH(hub, &hubs, next) {
monitor_printf(mon, "hub %d\n", hub->id);
QLIST_FOREACH(port, &hub->ports, next) {
monitor_printf(mon, " \\ %s", port->nc.name);
if (port->nc.peer) {
monitor_printf(mon, ": ");
print_net_client(mon, port->nc.peer);
} else {
monitor_printf(mon, "\n");
}
}
}
}
/**
* Get the hub id that a client is connected to
*
* @id: Pointer for hub id output, may be NULL
*/
int net_hub_id_for_client(NetClientState *nc, int *id)
{
NetHubPort *port;
if (nc->info->type == NET_CLIENT_DRIVER_HUBPORT) {
port = DO_UPCAST(NetHubPort, nc, nc);
} else if (nc->peer != NULL && nc->peer->info->type ==
NET_CLIENT_DRIVER_HUBPORT) {
port = DO_UPCAST(NetHubPort, nc, nc->peer);
} else {
return -ENOENT;
}
if (id) {
*id = port->hub->id;
}
return 0;
}
int net_init_hubport(const Netdev *netdev, const char *name,
NetClientState *peer, Error **errp)
{
const NetdevHubPortOptions *hubport;
assert(netdev->type == NET_CLIENT_DRIVER_HUBPORT);
assert(!peer);
hubport = &netdev->u.hubport;
net_hub_add_port(hubport->hubid, name);
return 0;
}
/**
* Warn if hub configurations are likely wrong
*/
void net_hub_check_clients(void)
{
NetHub *hub;
NetHubPort *port;
NetClientState *peer;
QLIST_FOREACH(hub, &hubs, next) {
int has_nic = 0, has_host_dev = 0;
QLIST_FOREACH(port, &hub->ports, next) {
peer = port->nc.peer;
if (!peer) {
fprintf(stderr, "Warning: hub port %s has no peer\n",
port->nc.name);
continue;
}
switch (peer->info->type) {
case NET_CLIENT_DRIVER_NIC:
has_nic = 1;
break;
case NET_CLIENT_DRIVER_USER:
case NET_CLIENT_DRIVER_TAP:
case NET_CLIENT_DRIVER_SOCKET:
case NET_CLIENT_DRIVER_VDE:
case NET_CLIENT_DRIVER_VHOST_USER:
has_host_dev = 1;
break;
default:
break;
}
}
if (has_host_dev && !has_nic) {
fprintf(stderr, "Warning: vlan %d with no nics\n", hub->id);
}
if (has_nic && !has_host_dev) {
fprintf(stderr,
"Warning: vlan %d is not connected to host network\n",
hub->id);
}
}
}
bool net_hub_flush(NetClientState *nc)
{
NetHubPort *port;
NetHubPort *source_port = DO_UPCAST(NetHubPort, nc, nc);
int ret = 0;
QLIST_FOREACH(port, &source_port->hub->ports, next) {
if (port != source_port) {
ret += qemu_net_queue_flush(port->nc.incoming_queue);
}
}
return ret ? true : false;
}